Commit | Line | Data |
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bcea3f96 | 1 | // SPDX-License-Identifier: GPL-2.0 |
bc0c38d1 SR |
2 | /* |
3 | * ring buffer based function tracer | |
4 | * | |
2b6080f2 | 5 | * Copyright (C) 2007-2012 Steven Rostedt <srostedt@redhat.com> |
bc0c38d1 SR |
6 | * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> |
7 | * | |
8 | * Originally taken from the RT patch by: | |
9 | * Arnaldo Carvalho de Melo <acme@redhat.com> | |
10 | * | |
11 | * Based on code from the latency_tracer, that is: | |
12 | * Copyright (C) 2004-2006 Ingo Molnar | |
6d49e352 | 13 | * Copyright (C) 2004 Nadia Yvette Chambers |
bc0c38d1 | 14 | */ |
2cadf913 | 15 | #include <linux/ring_buffer.h> |
273b281f | 16 | #include <generated/utsrelease.h> |
2cadf913 SR |
17 | #include <linux/stacktrace.h> |
18 | #include <linux/writeback.h> | |
bc0c38d1 | 19 | #include <linux/kallsyms.h> |
17911ff3 | 20 | #include <linux/security.h> |
bc0c38d1 | 21 | #include <linux/seq_file.h> |
3f5a54e3 | 22 | #include <linux/notifier.h> |
2cadf913 | 23 | #include <linux/irqflags.h> |
bc0c38d1 | 24 | #include <linux/debugfs.h> |
8434dc93 | 25 | #include <linux/tracefs.h> |
4c11d7ae | 26 | #include <linux/pagemap.h> |
bc0c38d1 SR |
27 | #include <linux/hardirq.h> |
28 | #include <linux/linkage.h> | |
29 | #include <linux/uaccess.h> | |
76c813e2 | 30 | #include <linux/vmalloc.h> |
bc0c38d1 SR |
31 | #include <linux/ftrace.h> |
32 | #include <linux/module.h> | |
33 | #include <linux/percpu.h> | |
2cadf913 | 34 | #include <linux/splice.h> |
3f5a54e3 | 35 | #include <linux/kdebug.h> |
5f0c6c03 | 36 | #include <linux/string.h> |
f76180bc | 37 | #include <linux/mount.h> |
7e53bd42 | 38 | #include <linux/rwsem.h> |
5a0e3ad6 | 39 | #include <linux/slab.h> |
bc0c38d1 SR |
40 | #include <linux/ctype.h> |
41 | #include <linux/init.h> | |
2a2cc8f7 | 42 | #include <linux/poll.h> |
b892e5c8 | 43 | #include <linux/nmi.h> |
bc0c38d1 | 44 | #include <linux/fs.h> |
478409dd | 45 | #include <linux/trace.h> |
3fd49c9e | 46 | #include <linux/sched/clock.h> |
8bd75c77 | 47 | #include <linux/sched/rt.h> |
91edde2e VRB |
48 | #include <linux/fsnotify.h> |
49 | #include <linux/irq_work.h> | |
50 | #include <linux/workqueue.h> | |
86387f7e | 51 | |
bc0c38d1 | 52 | #include "trace.h" |
f0868d1e | 53 | #include "trace_output.h" |
bc0c38d1 | 54 | |
73c5162a SR |
55 | /* |
56 | * On boot up, the ring buffer is set to the minimum size, so that | |
57 | * we do not waste memory on systems that are not using tracing. | |
58 | */ | |
55034cd6 | 59 | bool ring_buffer_expanded; |
73c5162a | 60 | |
8e1b82e0 FW |
61 | /* |
62 | * We need to change this state when a selftest is running. | |
ff32504f FW |
63 | * A selftest will lurk into the ring-buffer to count the |
64 | * entries inserted during the selftest although some concurrent | |
5e1607a0 | 65 | * insertions into the ring-buffer such as trace_printk could occurred |
ff32504f FW |
66 | * at the same time, giving false positive or negative results. |
67 | */ | |
8e1b82e0 | 68 | static bool __read_mostly tracing_selftest_running; |
ff32504f | 69 | |
b2821ae6 SR |
70 | /* |
71 | * If a tracer is running, we do not want to run SELFTEST. | |
72 | */ | |
020e5f85 | 73 | bool __read_mostly tracing_selftest_disabled; |
b2821ae6 | 74 | |
0daa2302 SRRH |
75 | /* Pipe tracepoints to printk */ |
76 | struct trace_iterator *tracepoint_print_iter; | |
77 | int tracepoint_printk; | |
42391745 | 78 | static DEFINE_STATIC_KEY_FALSE(tracepoint_printk_key); |
0daa2302 | 79 | |
adf9f195 FW |
80 | /* For tracers that don't implement custom flags */ |
81 | static struct tracer_opt dummy_tracer_opt[] = { | |
82 | { } | |
83 | }; | |
84 | ||
8c1a49ae SRRH |
85 | static int |
86 | dummy_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set) | |
adf9f195 FW |
87 | { |
88 | return 0; | |
89 | } | |
0f048701 | 90 | |
7ffbd48d SR |
91 | /* |
92 | * To prevent the comm cache from being overwritten when no | |
93 | * tracing is active, only save the comm when a trace event | |
94 | * occurred. | |
95 | */ | |
d914ba37 | 96 | static DEFINE_PER_CPU(bool, trace_taskinfo_save); |
7ffbd48d | 97 | |
0f048701 SR |
98 | /* |
99 | * Kill all tracing for good (never come back). | |
100 | * It is initialized to 1 but will turn to zero if the initialization | |
101 | * of the tracer is successful. But that is the only place that sets | |
102 | * this back to zero. | |
103 | */ | |
4fd27358 | 104 | static int tracing_disabled = 1; |
0f048701 | 105 | |
955b61e5 | 106 | cpumask_var_t __read_mostly tracing_buffer_mask; |
ab46428c | 107 | |
944ac425 SR |
108 | /* |
109 | * ftrace_dump_on_oops - variable to dump ftrace buffer on oops | |
110 | * | |
111 | * If there is an oops (or kernel panic) and the ftrace_dump_on_oops | |
112 | * is set, then ftrace_dump is called. This will output the contents | |
113 | * of the ftrace buffers to the console. This is very useful for | |
114 | * capturing traces that lead to crashes and outputing it to a | |
115 | * serial console. | |
116 | * | |
117 | * It is default off, but you can enable it with either specifying | |
118 | * "ftrace_dump_on_oops" in the kernel command line, or setting | |
cecbca96 FW |
119 | * /proc/sys/kernel/ftrace_dump_on_oops |
120 | * Set 1 if you want to dump buffers of all CPUs | |
121 | * Set 2 if you want to dump the buffer of the CPU that triggered oops | |
944ac425 | 122 | */ |
cecbca96 FW |
123 | |
124 | enum ftrace_dump_mode ftrace_dump_on_oops; | |
944ac425 | 125 | |
de7edd31 SRRH |
126 | /* When set, tracing will stop when a WARN*() is hit */ |
127 | int __disable_trace_on_warning; | |
128 | ||
681bec03 JL |
129 | #ifdef CONFIG_TRACE_EVAL_MAP_FILE |
130 | /* Map of enums to their values, for "eval_map" file */ | |
23bf8cb8 | 131 | struct trace_eval_map_head { |
9828413d SRRH |
132 | struct module *mod; |
133 | unsigned long length; | |
134 | }; | |
135 | ||
23bf8cb8 | 136 | union trace_eval_map_item; |
9828413d | 137 | |
23bf8cb8 | 138 | struct trace_eval_map_tail { |
9828413d SRRH |
139 | /* |
140 | * "end" is first and points to NULL as it must be different | |
00f4b652 | 141 | * than "mod" or "eval_string" |
9828413d | 142 | */ |
23bf8cb8 | 143 | union trace_eval_map_item *next; |
9828413d SRRH |
144 | const char *end; /* points to NULL */ |
145 | }; | |
146 | ||
1793ed93 | 147 | static DEFINE_MUTEX(trace_eval_mutex); |
9828413d SRRH |
148 | |
149 | /* | |
23bf8cb8 | 150 | * The trace_eval_maps are saved in an array with two extra elements, |
9828413d SRRH |
151 | * one at the beginning, and one at the end. The beginning item contains |
152 | * the count of the saved maps (head.length), and the module they | |
153 | * belong to if not built in (head.mod). The ending item contains a | |
681bec03 | 154 | * pointer to the next array of saved eval_map items. |
9828413d | 155 | */ |
23bf8cb8 | 156 | union trace_eval_map_item { |
00f4b652 | 157 | struct trace_eval_map map; |
23bf8cb8 JL |
158 | struct trace_eval_map_head head; |
159 | struct trace_eval_map_tail tail; | |
9828413d SRRH |
160 | }; |
161 | ||
23bf8cb8 | 162 | static union trace_eval_map_item *trace_eval_maps; |
681bec03 | 163 | #endif /* CONFIG_TRACE_EVAL_MAP_FILE */ |
9828413d | 164 | |
9c5b9d3d | 165 | int tracing_set_tracer(struct trace_array *tr, const char *buf); |
13292494 | 166 | static void ftrace_trace_userstack(struct trace_buffer *buffer, |
c438f140 | 167 | unsigned long flags, int pc); |
b2821ae6 | 168 | |
ee6c2c1b LZ |
169 | #define MAX_TRACER_SIZE 100 |
170 | static char bootup_tracer_buf[MAX_TRACER_SIZE] __initdata; | |
b2821ae6 | 171 | static char *default_bootup_tracer; |
d9e54076 | 172 | |
55034cd6 SRRH |
173 | static bool allocate_snapshot; |
174 | ||
1beee96b | 175 | static int __init set_cmdline_ftrace(char *str) |
d9e54076 | 176 | { |
67012ab1 | 177 | strlcpy(bootup_tracer_buf, str, MAX_TRACER_SIZE); |
b2821ae6 | 178 | default_bootup_tracer = bootup_tracer_buf; |
73c5162a | 179 | /* We are using ftrace early, expand it */ |
55034cd6 | 180 | ring_buffer_expanded = true; |
d9e54076 PZ |
181 | return 1; |
182 | } | |
1beee96b | 183 | __setup("ftrace=", set_cmdline_ftrace); |
d9e54076 | 184 | |
944ac425 SR |
185 | static int __init set_ftrace_dump_on_oops(char *str) |
186 | { | |
cecbca96 FW |
187 | if (*str++ != '=' || !*str) { |
188 | ftrace_dump_on_oops = DUMP_ALL; | |
189 | return 1; | |
190 | } | |
191 | ||
192 | if (!strcmp("orig_cpu", str)) { | |
193 | ftrace_dump_on_oops = DUMP_ORIG; | |
194 | return 1; | |
195 | } | |
196 | ||
197 | return 0; | |
944ac425 SR |
198 | } |
199 | __setup("ftrace_dump_on_oops", set_ftrace_dump_on_oops); | |
60a11774 | 200 | |
de7edd31 SRRH |
201 | static int __init stop_trace_on_warning(char *str) |
202 | { | |
933ff9f2 LCG |
203 | if ((strcmp(str, "=0") != 0 && strcmp(str, "=off") != 0)) |
204 | __disable_trace_on_warning = 1; | |
de7edd31 SRRH |
205 | return 1; |
206 | } | |
933ff9f2 | 207 | __setup("traceoff_on_warning", stop_trace_on_warning); |
de7edd31 | 208 | |
3209cff4 | 209 | static int __init boot_alloc_snapshot(char *str) |
55034cd6 SRRH |
210 | { |
211 | allocate_snapshot = true; | |
212 | /* We also need the main ring buffer expanded */ | |
213 | ring_buffer_expanded = true; | |
214 | return 1; | |
215 | } | |
3209cff4 | 216 | __setup("alloc_snapshot", boot_alloc_snapshot); |
55034cd6 | 217 | |
7bcfaf54 SR |
218 | |
219 | static char trace_boot_options_buf[MAX_TRACER_SIZE] __initdata; | |
7bcfaf54 SR |
220 | |
221 | static int __init set_trace_boot_options(char *str) | |
222 | { | |
67012ab1 | 223 | strlcpy(trace_boot_options_buf, str, MAX_TRACER_SIZE); |
7bcfaf54 SR |
224 | return 0; |
225 | } | |
226 | __setup("trace_options=", set_trace_boot_options); | |
227 | ||
e1e232ca SR |
228 | static char trace_boot_clock_buf[MAX_TRACER_SIZE] __initdata; |
229 | static char *trace_boot_clock __initdata; | |
230 | ||
231 | static int __init set_trace_boot_clock(char *str) | |
232 | { | |
233 | strlcpy(trace_boot_clock_buf, str, MAX_TRACER_SIZE); | |
234 | trace_boot_clock = trace_boot_clock_buf; | |
235 | return 0; | |
236 | } | |
237 | __setup("trace_clock=", set_trace_boot_clock); | |
238 | ||
0daa2302 SRRH |
239 | static int __init set_tracepoint_printk(char *str) |
240 | { | |
241 | if ((strcmp(str, "=0") != 0 && strcmp(str, "=off") != 0)) | |
242 | tracepoint_printk = 1; | |
243 | return 1; | |
244 | } | |
245 | __setup("tp_printk", set_tracepoint_printk); | |
de7edd31 | 246 | |
a5a1d1c2 | 247 | unsigned long long ns2usecs(u64 nsec) |
bc0c38d1 SR |
248 | { |
249 | nsec += 500; | |
250 | do_div(nsec, 1000); | |
251 | return nsec; | |
252 | } | |
253 | ||
983f938a SRRH |
254 | /* trace_flags holds trace_options default values */ |
255 | #define TRACE_DEFAULT_FLAGS \ | |
256 | (FUNCTION_DEFAULT_FLAGS | \ | |
257 | TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK | \ | |
258 | TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO | \ | |
259 | TRACE_ITER_RECORD_CMD | TRACE_ITER_OVERWRITE | \ | |
260 | TRACE_ITER_IRQ_INFO | TRACE_ITER_MARKERS) | |
261 | ||
16270145 SRRH |
262 | /* trace_options that are only supported by global_trace */ |
263 | #define TOP_LEVEL_TRACE_FLAGS (TRACE_ITER_PRINTK | \ | |
264 | TRACE_ITER_PRINTK_MSGONLY | TRACE_ITER_RECORD_CMD) | |
265 | ||
20550622 SRRH |
266 | /* trace_flags that are default zero for instances */ |
267 | #define ZEROED_TRACE_FLAGS \ | |
1e10486f | 268 | (TRACE_ITER_EVENT_FORK | TRACE_ITER_FUNC_FORK) |
16270145 | 269 | |
4fcdae83 | 270 | /* |
67d04bb2 JF |
271 | * The global_trace is the descriptor that holds the top-level tracing |
272 | * buffers for the live tracing. | |
4fcdae83 | 273 | */ |
983f938a SRRH |
274 | static struct trace_array global_trace = { |
275 | .trace_flags = TRACE_DEFAULT_FLAGS, | |
276 | }; | |
bc0c38d1 | 277 | |
ae63b31e | 278 | LIST_HEAD(ftrace_trace_arrays); |
bc0c38d1 | 279 | |
ff451961 SRRH |
280 | int trace_array_get(struct trace_array *this_tr) |
281 | { | |
282 | struct trace_array *tr; | |
283 | int ret = -ENODEV; | |
284 | ||
285 | mutex_lock(&trace_types_lock); | |
286 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
287 | if (tr == this_tr) { | |
288 | tr->ref++; | |
289 | ret = 0; | |
290 | break; | |
291 | } | |
292 | } | |
293 | mutex_unlock(&trace_types_lock); | |
294 | ||
295 | return ret; | |
296 | } | |
297 | ||
298 | static void __trace_array_put(struct trace_array *this_tr) | |
299 | { | |
300 | WARN_ON(!this_tr->ref); | |
301 | this_tr->ref--; | |
302 | } | |
303 | ||
28879787 DI |
304 | /** |
305 | * trace_array_put - Decrement the reference counter for this trace array. | |
306 | * | |
307 | * NOTE: Use this when we no longer need the trace array returned by | |
308 | * trace_array_get_by_name(). This ensures the trace array can be later | |
309 | * destroyed. | |
310 | * | |
311 | */ | |
ff451961 SRRH |
312 | void trace_array_put(struct trace_array *this_tr) |
313 | { | |
28879787 DI |
314 | if (!this_tr) |
315 | return; | |
316 | ||
ff451961 SRRH |
317 | mutex_lock(&trace_types_lock); |
318 | __trace_array_put(this_tr); | |
319 | mutex_unlock(&trace_types_lock); | |
320 | } | |
28879787 | 321 | EXPORT_SYMBOL_GPL(trace_array_put); |
ff451961 | 322 | |
8530dec6 SRV |
323 | int tracing_check_open_get_tr(struct trace_array *tr) |
324 | { | |
17911ff3 SRV |
325 | int ret; |
326 | ||
327 | ret = security_locked_down(LOCKDOWN_TRACEFS); | |
328 | if (ret) | |
329 | return ret; | |
330 | ||
8530dec6 SRV |
331 | if (tracing_disabled) |
332 | return -ENODEV; | |
333 | ||
334 | if (tr && trace_array_get(tr) < 0) | |
335 | return -ENODEV; | |
336 | ||
337 | return 0; | |
338 | } | |
339 | ||
2425bcb9 | 340 | int call_filter_check_discard(struct trace_event_call *call, void *rec, |
13292494 | 341 | struct trace_buffer *buffer, |
f306cc82 TZ |
342 | struct ring_buffer_event *event) |
343 | { | |
344 | if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) && | |
345 | !filter_match_preds(call->filter, rec)) { | |
0fc1b09f | 346 | __trace_event_discard_commit(buffer, event); |
f306cc82 TZ |
347 | return 1; |
348 | } | |
349 | ||
350 | return 0; | |
eb02ce01 TZ |
351 | } |
352 | ||
76c813e2 SRRH |
353 | void trace_free_pid_list(struct trace_pid_list *pid_list) |
354 | { | |
355 | vfree(pid_list->pids); | |
356 | kfree(pid_list); | |
357 | } | |
358 | ||
d8275c45 SR |
359 | /** |
360 | * trace_find_filtered_pid - check if a pid exists in a filtered_pid list | |
361 | * @filtered_pids: The list of pids to check | |
362 | * @search_pid: The PID to find in @filtered_pids | |
363 | * | |
364 | * Returns true if @search_pid is fonud in @filtered_pids, and false otherwis. | |
365 | */ | |
366 | bool | |
367 | trace_find_filtered_pid(struct trace_pid_list *filtered_pids, pid_t search_pid) | |
368 | { | |
369 | /* | |
370 | * If pid_max changed after filtered_pids was created, we | |
371 | * by default ignore all pids greater than the previous pid_max. | |
372 | */ | |
373 | if (search_pid >= filtered_pids->pid_max) | |
374 | return false; | |
375 | ||
376 | return test_bit(search_pid, filtered_pids->pids); | |
377 | } | |
378 | ||
379 | /** | |
380 | * trace_ignore_this_task - should a task be ignored for tracing | |
381 | * @filtered_pids: The list of pids to check | |
382 | * @task: The task that should be ignored if not filtered | |
383 | * | |
384 | * Checks if @task should be traced or not from @filtered_pids. | |
385 | * Returns true if @task should *NOT* be traced. | |
386 | * Returns false if @task should be traced. | |
387 | */ | |
388 | bool | |
b3b1e6ed SRV |
389 | trace_ignore_this_task(struct trace_pid_list *filtered_pids, |
390 | struct trace_pid_list *filtered_no_pids, | |
391 | struct task_struct *task) | |
d8275c45 SR |
392 | { |
393 | /* | |
b3b1e6ed SRV |
394 | * If filterd_no_pids is not empty, and the task's pid is listed |
395 | * in filtered_no_pids, then return true. | |
396 | * Otherwise, if filtered_pids is empty, that means we can | |
397 | * trace all tasks. If it has content, then only trace pids | |
398 | * within filtered_pids. | |
d8275c45 | 399 | */ |
d8275c45 | 400 | |
b3b1e6ed SRV |
401 | return (filtered_pids && |
402 | !trace_find_filtered_pid(filtered_pids, task->pid)) || | |
403 | (filtered_no_pids && | |
404 | trace_find_filtered_pid(filtered_no_pids, task->pid)); | |
d8275c45 SR |
405 | } |
406 | ||
407 | /** | |
f08367b3 | 408 | * trace_filter_add_remove_task - Add or remove a task from a pid_list |
d8275c45 SR |
409 | * @pid_list: The list to modify |
410 | * @self: The current task for fork or NULL for exit | |
411 | * @task: The task to add or remove | |
412 | * | |
413 | * If adding a task, if @self is defined, the task is only added if @self | |
414 | * is also included in @pid_list. This happens on fork and tasks should | |
415 | * only be added when the parent is listed. If @self is NULL, then the | |
416 | * @task pid will be removed from the list, which would happen on exit | |
417 | * of a task. | |
418 | */ | |
419 | void trace_filter_add_remove_task(struct trace_pid_list *pid_list, | |
420 | struct task_struct *self, | |
421 | struct task_struct *task) | |
422 | { | |
423 | if (!pid_list) | |
424 | return; | |
425 | ||
426 | /* For forks, we only add if the forking task is listed */ | |
427 | if (self) { | |
428 | if (!trace_find_filtered_pid(pid_list, self->pid)) | |
429 | return; | |
430 | } | |
431 | ||
432 | /* Sorry, but we don't support pid_max changing after setting */ | |
433 | if (task->pid >= pid_list->pid_max) | |
434 | return; | |
435 | ||
436 | /* "self" is set for forks, and NULL for exits */ | |
437 | if (self) | |
438 | set_bit(task->pid, pid_list->pids); | |
439 | else | |
440 | clear_bit(task->pid, pid_list->pids); | |
441 | } | |
442 | ||
5cc8976b SRRH |
443 | /** |
444 | * trace_pid_next - Used for seq_file to get to the next pid of a pid_list | |
445 | * @pid_list: The pid list to show | |
446 | * @v: The last pid that was shown (+1 the actual pid to let zero be displayed) | |
447 | * @pos: The position of the file | |
448 | * | |
449 | * This is used by the seq_file "next" operation to iterate the pids | |
450 | * listed in a trace_pid_list structure. | |
451 | * | |
452 | * Returns the pid+1 as we want to display pid of zero, but NULL would | |
453 | * stop the iteration. | |
454 | */ | |
455 | void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos) | |
456 | { | |
457 | unsigned long pid = (unsigned long)v; | |
458 | ||
459 | (*pos)++; | |
460 | ||
461 | /* pid already is +1 of the actual prevous bit */ | |
462 | pid = find_next_bit(pid_list->pids, pid_list->pid_max, pid); | |
463 | ||
464 | /* Return pid + 1 to allow zero to be represented */ | |
465 | if (pid < pid_list->pid_max) | |
466 | return (void *)(pid + 1); | |
467 | ||
468 | return NULL; | |
469 | } | |
470 | ||
471 | /** | |
472 | * trace_pid_start - Used for seq_file to start reading pid lists | |
473 | * @pid_list: The pid list to show | |
474 | * @pos: The position of the file | |
475 | * | |
476 | * This is used by seq_file "start" operation to start the iteration | |
477 | * of listing pids. | |
478 | * | |
479 | * Returns the pid+1 as we want to display pid of zero, but NULL would | |
480 | * stop the iteration. | |
481 | */ | |
482 | void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos) | |
483 | { | |
484 | unsigned long pid; | |
485 | loff_t l = 0; | |
486 | ||
487 | pid = find_first_bit(pid_list->pids, pid_list->pid_max); | |
488 | if (pid >= pid_list->pid_max) | |
489 | return NULL; | |
490 | ||
491 | /* Return pid + 1 so that zero can be the exit value */ | |
492 | for (pid++; pid && l < *pos; | |
493 | pid = (unsigned long)trace_pid_next(pid_list, (void *)pid, &l)) | |
494 | ; | |
495 | return (void *)pid; | |
496 | } | |
497 | ||
498 | /** | |
499 | * trace_pid_show - show the current pid in seq_file processing | |
500 | * @m: The seq_file structure to write into | |
501 | * @v: A void pointer of the pid (+1) value to display | |
502 | * | |
503 | * Can be directly used by seq_file operations to display the current | |
504 | * pid value. | |
505 | */ | |
506 | int trace_pid_show(struct seq_file *m, void *v) | |
507 | { | |
508 | unsigned long pid = (unsigned long)v - 1; | |
509 | ||
510 | seq_printf(m, "%lu\n", pid); | |
511 | return 0; | |
512 | } | |
513 | ||
76c813e2 SRRH |
514 | /* 128 should be much more than enough */ |
515 | #define PID_BUF_SIZE 127 | |
516 | ||
517 | int trace_pid_write(struct trace_pid_list *filtered_pids, | |
518 | struct trace_pid_list **new_pid_list, | |
519 | const char __user *ubuf, size_t cnt) | |
520 | { | |
521 | struct trace_pid_list *pid_list; | |
522 | struct trace_parser parser; | |
523 | unsigned long val; | |
524 | int nr_pids = 0; | |
525 | ssize_t read = 0; | |
526 | ssize_t ret = 0; | |
527 | loff_t pos; | |
528 | pid_t pid; | |
529 | ||
530 | if (trace_parser_get_init(&parser, PID_BUF_SIZE + 1)) | |
531 | return -ENOMEM; | |
532 | ||
533 | /* | |
534 | * Always recreate a new array. The write is an all or nothing | |
535 | * operation. Always create a new array when adding new pids by | |
536 | * the user. If the operation fails, then the current list is | |
537 | * not modified. | |
538 | */ | |
539 | pid_list = kmalloc(sizeof(*pid_list), GFP_KERNEL); | |
91862cc7 WW |
540 | if (!pid_list) { |
541 | trace_parser_put(&parser); | |
76c813e2 | 542 | return -ENOMEM; |
91862cc7 | 543 | } |
76c813e2 SRRH |
544 | |
545 | pid_list->pid_max = READ_ONCE(pid_max); | |
546 | ||
547 | /* Only truncating will shrink pid_max */ | |
548 | if (filtered_pids && filtered_pids->pid_max > pid_list->pid_max) | |
549 | pid_list->pid_max = filtered_pids->pid_max; | |
550 | ||
551 | pid_list->pids = vzalloc((pid_list->pid_max + 7) >> 3); | |
552 | if (!pid_list->pids) { | |
91862cc7 | 553 | trace_parser_put(&parser); |
76c813e2 SRRH |
554 | kfree(pid_list); |
555 | return -ENOMEM; | |
556 | } | |
557 | ||
558 | if (filtered_pids) { | |
559 | /* copy the current bits to the new max */ | |
67f20b08 WY |
560 | for_each_set_bit(pid, filtered_pids->pids, |
561 | filtered_pids->pid_max) { | |
76c813e2 | 562 | set_bit(pid, pid_list->pids); |
76c813e2 SRRH |
563 | nr_pids++; |
564 | } | |
565 | } | |
566 | ||
567 | while (cnt > 0) { | |
568 | ||
569 | pos = 0; | |
570 | ||
571 | ret = trace_get_user(&parser, ubuf, cnt, &pos); | |
572 | if (ret < 0 || !trace_parser_loaded(&parser)) | |
573 | break; | |
574 | ||
575 | read += ret; | |
576 | ubuf += ret; | |
577 | cnt -= ret; | |
578 | ||
76c813e2 SRRH |
579 | ret = -EINVAL; |
580 | if (kstrtoul(parser.buffer, 0, &val)) | |
581 | break; | |
582 | if (val >= pid_list->pid_max) | |
583 | break; | |
584 | ||
585 | pid = (pid_t)val; | |
586 | ||
587 | set_bit(pid, pid_list->pids); | |
588 | nr_pids++; | |
589 | ||
590 | trace_parser_clear(&parser); | |
591 | ret = 0; | |
592 | } | |
593 | trace_parser_put(&parser); | |
594 | ||
595 | if (ret < 0) { | |
596 | trace_free_pid_list(pid_list); | |
597 | return ret; | |
598 | } | |
599 | ||
600 | if (!nr_pids) { | |
601 | /* Cleared the list of pids */ | |
602 | trace_free_pid_list(pid_list); | |
603 | read = ret; | |
604 | pid_list = NULL; | |
605 | } | |
606 | ||
607 | *new_pid_list = pid_list; | |
608 | ||
609 | return read; | |
610 | } | |
611 | ||
1c5eb448 | 612 | static u64 buffer_ftrace_now(struct array_buffer *buf, int cpu) |
37886f6a SR |
613 | { |
614 | u64 ts; | |
615 | ||
616 | /* Early boot up does not have a buffer yet */ | |
9457158b | 617 | if (!buf->buffer) |
37886f6a SR |
618 | return trace_clock_local(); |
619 | ||
9457158b AL |
620 | ts = ring_buffer_time_stamp(buf->buffer, cpu); |
621 | ring_buffer_normalize_time_stamp(buf->buffer, cpu, &ts); | |
37886f6a SR |
622 | |
623 | return ts; | |
624 | } | |
bc0c38d1 | 625 | |
a5a1d1c2 | 626 | u64 ftrace_now(int cpu) |
9457158b | 627 | { |
1c5eb448 | 628 | return buffer_ftrace_now(&global_trace.array_buffer, cpu); |
9457158b AL |
629 | } |
630 | ||
10246fa3 SRRH |
631 | /** |
632 | * tracing_is_enabled - Show if global_trace has been disabled | |
633 | * | |
634 | * Shows if the global trace has been enabled or not. It uses the | |
635 | * mirror flag "buffer_disabled" to be used in fast paths such as for | |
636 | * the irqsoff tracer. But it may be inaccurate due to races. If you | |
637 | * need to know the accurate state, use tracing_is_on() which is a little | |
638 | * slower, but accurate. | |
639 | */ | |
9036990d SR |
640 | int tracing_is_enabled(void) |
641 | { | |
10246fa3 SRRH |
642 | /* |
643 | * For quick access (irqsoff uses this in fast path), just | |
644 | * return the mirror variable of the state of the ring buffer. | |
645 | * It's a little racy, but we don't really care. | |
646 | */ | |
647 | smp_rmb(); | |
648 | return !global_trace.buffer_disabled; | |
9036990d SR |
649 | } |
650 | ||
4fcdae83 | 651 | /* |
3928a8a2 SR |
652 | * trace_buf_size is the size in bytes that is allocated |
653 | * for a buffer. Note, the number of bytes is always rounded | |
654 | * to page size. | |
3f5a54e3 SR |
655 | * |
656 | * This number is purposely set to a low number of 16384. | |
657 | * If the dump on oops happens, it will be much appreciated | |
658 | * to not have to wait for all that output. Anyway this can be | |
659 | * boot time and run time configurable. | |
4fcdae83 | 660 | */ |
3928a8a2 | 661 | #define TRACE_BUF_SIZE_DEFAULT 1441792UL /* 16384 * 88 (sizeof(entry)) */ |
3f5a54e3 | 662 | |
3928a8a2 | 663 | static unsigned long trace_buf_size = TRACE_BUF_SIZE_DEFAULT; |
bc0c38d1 | 664 | |
4fcdae83 | 665 | /* trace_types holds a link list of available tracers. */ |
bc0c38d1 | 666 | static struct tracer *trace_types __read_mostly; |
4fcdae83 | 667 | |
4fcdae83 SR |
668 | /* |
669 | * trace_types_lock is used to protect the trace_types list. | |
4fcdae83 | 670 | */ |
a8227415 | 671 | DEFINE_MUTEX(trace_types_lock); |
4fcdae83 | 672 | |
7e53bd42 LJ |
673 | /* |
674 | * serialize the access of the ring buffer | |
675 | * | |
676 | * ring buffer serializes readers, but it is low level protection. | |
677 | * The validity of the events (which returns by ring_buffer_peek() ..etc) | |
678 | * are not protected by ring buffer. | |
679 | * | |
680 | * The content of events may become garbage if we allow other process consumes | |
681 | * these events concurrently: | |
682 | * A) the page of the consumed events may become a normal page | |
683 | * (not reader page) in ring buffer, and this page will be rewrited | |
684 | * by events producer. | |
685 | * B) The page of the consumed events may become a page for splice_read, | |
686 | * and this page will be returned to system. | |
687 | * | |
688 | * These primitives allow multi process access to different cpu ring buffer | |
689 | * concurrently. | |
690 | * | |
691 | * These primitives don't distinguish read-only and read-consume access. | |
692 | * Multi read-only access are also serialized. | |
693 | */ | |
694 | ||
695 | #ifdef CONFIG_SMP | |
696 | static DECLARE_RWSEM(all_cpu_access_lock); | |
697 | static DEFINE_PER_CPU(struct mutex, cpu_access_lock); | |
698 | ||
699 | static inline void trace_access_lock(int cpu) | |
700 | { | |
ae3b5093 | 701 | if (cpu == RING_BUFFER_ALL_CPUS) { |
7e53bd42 LJ |
702 | /* gain it for accessing the whole ring buffer. */ |
703 | down_write(&all_cpu_access_lock); | |
704 | } else { | |
705 | /* gain it for accessing a cpu ring buffer. */ | |
706 | ||
ae3b5093 | 707 | /* Firstly block other trace_access_lock(RING_BUFFER_ALL_CPUS). */ |
7e53bd42 LJ |
708 | down_read(&all_cpu_access_lock); |
709 | ||
710 | /* Secondly block other access to this @cpu ring buffer. */ | |
711 | mutex_lock(&per_cpu(cpu_access_lock, cpu)); | |
712 | } | |
713 | } | |
714 | ||
715 | static inline void trace_access_unlock(int cpu) | |
716 | { | |
ae3b5093 | 717 | if (cpu == RING_BUFFER_ALL_CPUS) { |
7e53bd42 LJ |
718 | up_write(&all_cpu_access_lock); |
719 | } else { | |
720 | mutex_unlock(&per_cpu(cpu_access_lock, cpu)); | |
721 | up_read(&all_cpu_access_lock); | |
722 | } | |
723 | } | |
724 | ||
725 | static inline void trace_access_lock_init(void) | |
726 | { | |
727 | int cpu; | |
728 | ||
729 | for_each_possible_cpu(cpu) | |
730 | mutex_init(&per_cpu(cpu_access_lock, cpu)); | |
731 | } | |
732 | ||
733 | #else | |
734 | ||
735 | static DEFINE_MUTEX(access_lock); | |
736 | ||
737 | static inline void trace_access_lock(int cpu) | |
738 | { | |
739 | (void)cpu; | |
740 | mutex_lock(&access_lock); | |
741 | } | |
742 | ||
743 | static inline void trace_access_unlock(int cpu) | |
744 | { | |
745 | (void)cpu; | |
746 | mutex_unlock(&access_lock); | |
747 | } | |
748 | ||
749 | static inline void trace_access_lock_init(void) | |
750 | { | |
751 | } | |
752 | ||
753 | #endif | |
754 | ||
d78a4614 | 755 | #ifdef CONFIG_STACKTRACE |
13292494 | 756 | static void __ftrace_trace_stack(struct trace_buffer *buffer, |
d78a4614 SRRH |
757 | unsigned long flags, |
758 | int skip, int pc, struct pt_regs *regs); | |
2d34f489 | 759 | static inline void ftrace_trace_stack(struct trace_array *tr, |
13292494 | 760 | struct trace_buffer *buffer, |
73dddbb5 SRRH |
761 | unsigned long flags, |
762 | int skip, int pc, struct pt_regs *regs); | |
ca475e83 | 763 | |
d78a4614 | 764 | #else |
13292494 | 765 | static inline void __ftrace_trace_stack(struct trace_buffer *buffer, |
d78a4614 SRRH |
766 | unsigned long flags, |
767 | int skip, int pc, struct pt_regs *regs) | |
768 | { | |
769 | } | |
2d34f489 | 770 | static inline void ftrace_trace_stack(struct trace_array *tr, |
13292494 | 771 | struct trace_buffer *buffer, |
73dddbb5 SRRH |
772 | unsigned long flags, |
773 | int skip, int pc, struct pt_regs *regs) | |
ca475e83 SRRH |
774 | { |
775 | } | |
776 | ||
d78a4614 SRRH |
777 | #endif |
778 | ||
3e9a8aad SRRH |
779 | static __always_inline void |
780 | trace_event_setup(struct ring_buffer_event *event, | |
781 | int type, unsigned long flags, int pc) | |
782 | { | |
783 | struct trace_entry *ent = ring_buffer_event_data(event); | |
784 | ||
46710f3a | 785 | tracing_generic_entry_update(ent, type, flags, pc); |
3e9a8aad SRRH |
786 | } |
787 | ||
788 | static __always_inline struct ring_buffer_event * | |
13292494 | 789 | __trace_buffer_lock_reserve(struct trace_buffer *buffer, |
3e9a8aad SRRH |
790 | int type, |
791 | unsigned long len, | |
792 | unsigned long flags, int pc) | |
793 | { | |
794 | struct ring_buffer_event *event; | |
795 | ||
796 | event = ring_buffer_lock_reserve(buffer, len); | |
797 | if (event != NULL) | |
798 | trace_event_setup(event, type, flags, pc); | |
799 | ||
800 | return event; | |
801 | } | |
802 | ||
2290f2c5 | 803 | void tracer_tracing_on(struct trace_array *tr) |
10246fa3 | 804 | { |
1c5eb448 SRV |
805 | if (tr->array_buffer.buffer) |
806 | ring_buffer_record_on(tr->array_buffer.buffer); | |
10246fa3 SRRH |
807 | /* |
808 | * This flag is looked at when buffers haven't been allocated | |
809 | * yet, or by some tracers (like irqsoff), that just want to | |
810 | * know if the ring buffer has been disabled, but it can handle | |
811 | * races of where it gets disabled but we still do a record. | |
812 | * As the check is in the fast path of the tracers, it is more | |
813 | * important to be fast than accurate. | |
814 | */ | |
815 | tr->buffer_disabled = 0; | |
816 | /* Make the flag seen by readers */ | |
817 | smp_wmb(); | |
818 | } | |
819 | ||
499e5470 SR |
820 | /** |
821 | * tracing_on - enable tracing buffers | |
822 | * | |
823 | * This function enables tracing buffers that may have been | |
824 | * disabled with tracing_off. | |
825 | */ | |
826 | void tracing_on(void) | |
827 | { | |
10246fa3 | 828 | tracer_tracing_on(&global_trace); |
499e5470 SR |
829 | } |
830 | EXPORT_SYMBOL_GPL(tracing_on); | |
831 | ||
52ffabe3 SRRH |
832 | |
833 | static __always_inline void | |
13292494 | 834 | __buffer_unlock_commit(struct trace_buffer *buffer, struct ring_buffer_event *event) |
52ffabe3 | 835 | { |
d914ba37 | 836 | __this_cpu_write(trace_taskinfo_save, true); |
52ffabe3 SRRH |
837 | |
838 | /* If this is the temp buffer, we need to commit fully */ | |
839 | if (this_cpu_read(trace_buffered_event) == event) { | |
840 | /* Length is in event->array[0] */ | |
841 | ring_buffer_write(buffer, event->array[0], &event->array[1]); | |
842 | /* Release the temp buffer */ | |
843 | this_cpu_dec(trace_buffered_event_cnt); | |
844 | } else | |
845 | ring_buffer_unlock_commit(buffer, event); | |
846 | } | |
847 | ||
09ae7234 SRRH |
848 | /** |
849 | * __trace_puts - write a constant string into the trace buffer. | |
850 | * @ip: The address of the caller | |
851 | * @str: The constant string to write | |
852 | * @size: The size of the string. | |
853 | */ | |
854 | int __trace_puts(unsigned long ip, const char *str, int size) | |
855 | { | |
856 | struct ring_buffer_event *event; | |
13292494 | 857 | struct trace_buffer *buffer; |
09ae7234 SRRH |
858 | struct print_entry *entry; |
859 | unsigned long irq_flags; | |
860 | int alloc; | |
8abfb872 J |
861 | int pc; |
862 | ||
983f938a | 863 | if (!(global_trace.trace_flags & TRACE_ITER_PRINTK)) |
f0160a5a J |
864 | return 0; |
865 | ||
8abfb872 | 866 | pc = preempt_count(); |
09ae7234 | 867 | |
3132e107 SRRH |
868 | if (unlikely(tracing_selftest_running || tracing_disabled)) |
869 | return 0; | |
870 | ||
09ae7234 SRRH |
871 | alloc = sizeof(*entry) + size + 2; /* possible \n added */ |
872 | ||
873 | local_save_flags(irq_flags); | |
1c5eb448 | 874 | buffer = global_trace.array_buffer.buffer; |
82d1b815 | 875 | ring_buffer_nest_start(buffer); |
3e9a8aad SRRH |
876 | event = __trace_buffer_lock_reserve(buffer, TRACE_PRINT, alloc, |
877 | irq_flags, pc); | |
82d1b815 SRV |
878 | if (!event) { |
879 | size = 0; | |
880 | goto out; | |
881 | } | |
09ae7234 SRRH |
882 | |
883 | entry = ring_buffer_event_data(event); | |
884 | entry->ip = ip; | |
885 | ||
886 | memcpy(&entry->buf, str, size); | |
887 | ||
888 | /* Add a newline if necessary */ | |
889 | if (entry->buf[size - 1] != '\n') { | |
890 | entry->buf[size] = '\n'; | |
891 | entry->buf[size + 1] = '\0'; | |
892 | } else | |
893 | entry->buf[size] = '\0'; | |
894 | ||
895 | __buffer_unlock_commit(buffer, event); | |
2d34f489 | 896 | ftrace_trace_stack(&global_trace, buffer, irq_flags, 4, pc, NULL); |
82d1b815 SRV |
897 | out: |
898 | ring_buffer_nest_end(buffer); | |
09ae7234 SRRH |
899 | return size; |
900 | } | |
901 | EXPORT_SYMBOL_GPL(__trace_puts); | |
902 | ||
903 | /** | |
904 | * __trace_bputs - write the pointer to a constant string into trace buffer | |
905 | * @ip: The address of the caller | |
906 | * @str: The constant string to write to the buffer to | |
907 | */ | |
908 | int __trace_bputs(unsigned long ip, const char *str) | |
909 | { | |
910 | struct ring_buffer_event *event; | |
13292494 | 911 | struct trace_buffer *buffer; |
09ae7234 SRRH |
912 | struct bputs_entry *entry; |
913 | unsigned long irq_flags; | |
914 | int size = sizeof(struct bputs_entry); | |
82d1b815 | 915 | int ret = 0; |
8abfb872 J |
916 | int pc; |
917 | ||
983f938a | 918 | if (!(global_trace.trace_flags & TRACE_ITER_PRINTK)) |
f0160a5a J |
919 | return 0; |
920 | ||
8abfb872 | 921 | pc = preempt_count(); |
09ae7234 | 922 | |
3132e107 SRRH |
923 | if (unlikely(tracing_selftest_running || tracing_disabled)) |
924 | return 0; | |
925 | ||
09ae7234 | 926 | local_save_flags(irq_flags); |
1c5eb448 | 927 | buffer = global_trace.array_buffer.buffer; |
82d1b815 SRV |
928 | |
929 | ring_buffer_nest_start(buffer); | |
3e9a8aad SRRH |
930 | event = __trace_buffer_lock_reserve(buffer, TRACE_BPUTS, size, |
931 | irq_flags, pc); | |
09ae7234 | 932 | if (!event) |
82d1b815 | 933 | goto out; |
09ae7234 SRRH |
934 | |
935 | entry = ring_buffer_event_data(event); | |
936 | entry->ip = ip; | |
937 | entry->str = str; | |
938 | ||
939 | __buffer_unlock_commit(buffer, event); | |
2d34f489 | 940 | ftrace_trace_stack(&global_trace, buffer, irq_flags, 4, pc, NULL); |
09ae7234 | 941 | |
82d1b815 SRV |
942 | ret = 1; |
943 | out: | |
944 | ring_buffer_nest_end(buffer); | |
945 | return ret; | |
09ae7234 SRRH |
946 | } |
947 | EXPORT_SYMBOL_GPL(__trace_bputs); | |
948 | ||
ad909e21 | 949 | #ifdef CONFIG_TRACER_SNAPSHOT |
a35873a0 | 950 | void tracing_snapshot_instance_cond(struct trace_array *tr, void *cond_data) |
ad909e21 | 951 | { |
ad909e21 SRRH |
952 | struct tracer *tracer = tr->current_trace; |
953 | unsigned long flags; | |
954 | ||
1b22e382 SRRH |
955 | if (in_nmi()) { |
956 | internal_trace_puts("*** SNAPSHOT CALLED FROM NMI CONTEXT ***\n"); | |
957 | internal_trace_puts("*** snapshot is being ignored ***\n"); | |
958 | return; | |
959 | } | |
960 | ||
ad909e21 | 961 | if (!tr->allocated_snapshot) { |
ca268da6 SRRH |
962 | internal_trace_puts("*** SNAPSHOT NOT ALLOCATED ***\n"); |
963 | internal_trace_puts("*** stopping trace here! ***\n"); | |
ad909e21 SRRH |
964 | tracing_off(); |
965 | return; | |
966 | } | |
967 | ||
968 | /* Note, snapshot can not be used when the tracer uses it */ | |
969 | if (tracer->use_max_tr) { | |
ca268da6 SRRH |
970 | internal_trace_puts("*** LATENCY TRACER ACTIVE ***\n"); |
971 | internal_trace_puts("*** Can not use snapshot (sorry) ***\n"); | |
ad909e21 SRRH |
972 | return; |
973 | } | |
974 | ||
975 | local_irq_save(flags); | |
a35873a0 | 976 | update_max_tr(tr, current, smp_processor_id(), cond_data); |
ad909e21 SRRH |
977 | local_irq_restore(flags); |
978 | } | |
cab50379 | 979 | |
a35873a0 TZ |
980 | void tracing_snapshot_instance(struct trace_array *tr) |
981 | { | |
982 | tracing_snapshot_instance_cond(tr, NULL); | |
983 | } | |
984 | ||
cab50379 | 985 | /** |
5a93bae2 | 986 | * tracing_snapshot - take a snapshot of the current buffer. |
cab50379 SRV |
987 | * |
988 | * This causes a swap between the snapshot buffer and the current live | |
989 | * tracing buffer. You can use this to take snapshots of the live | |
990 | * trace when some condition is triggered, but continue to trace. | |
991 | * | |
992 | * Note, make sure to allocate the snapshot with either | |
993 | * a tracing_snapshot_alloc(), or by doing it manually | |
994 | * with: echo 1 > /sys/kernel/debug/tracing/snapshot | |
995 | * | |
996 | * If the snapshot buffer is not allocated, it will stop tracing. | |
997 | * Basically making a permanent snapshot. | |
998 | */ | |
999 | void tracing_snapshot(void) | |
1000 | { | |
1001 | struct trace_array *tr = &global_trace; | |
1002 | ||
1003 | tracing_snapshot_instance(tr); | |
1004 | } | |
1b22e382 | 1005 | EXPORT_SYMBOL_GPL(tracing_snapshot); |
ad909e21 | 1006 | |
a35873a0 TZ |
1007 | /** |
1008 | * tracing_snapshot_cond - conditionally take a snapshot of the current buffer. | |
1009 | * @tr: The tracing instance to snapshot | |
1010 | * @cond_data: The data to be tested conditionally, and possibly saved | |
1011 | * | |
1012 | * This is the same as tracing_snapshot() except that the snapshot is | |
1013 | * conditional - the snapshot will only happen if the | |
1014 | * cond_snapshot.update() implementation receiving the cond_data | |
1015 | * returns true, which means that the trace array's cond_snapshot | |
1016 | * update() operation used the cond_data to determine whether the | |
1017 | * snapshot should be taken, and if it was, presumably saved it along | |
1018 | * with the snapshot. | |
1019 | */ | |
1020 | void tracing_snapshot_cond(struct trace_array *tr, void *cond_data) | |
1021 | { | |
1022 | tracing_snapshot_instance_cond(tr, cond_data); | |
1023 | } | |
1024 | EXPORT_SYMBOL_GPL(tracing_snapshot_cond); | |
1025 | ||
1026 | /** | |
1027 | * tracing_snapshot_cond_data - get the user data associated with a snapshot | |
1028 | * @tr: The tracing instance | |
1029 | * | |
1030 | * When the user enables a conditional snapshot using | |
1031 | * tracing_snapshot_cond_enable(), the user-defined cond_data is saved | |
1032 | * with the snapshot. This accessor is used to retrieve it. | |
1033 | * | |
1034 | * Should not be called from cond_snapshot.update(), since it takes | |
1035 | * the tr->max_lock lock, which the code calling | |
1036 | * cond_snapshot.update() has already done. | |
1037 | * | |
1038 | * Returns the cond_data associated with the trace array's snapshot. | |
1039 | */ | |
1040 | void *tracing_cond_snapshot_data(struct trace_array *tr) | |
1041 | { | |
1042 | void *cond_data = NULL; | |
1043 | ||
1044 | arch_spin_lock(&tr->max_lock); | |
1045 | ||
1046 | if (tr->cond_snapshot) | |
1047 | cond_data = tr->cond_snapshot->cond_data; | |
1048 | ||
1049 | arch_spin_unlock(&tr->max_lock); | |
1050 | ||
1051 | return cond_data; | |
1052 | } | |
1053 | EXPORT_SYMBOL_GPL(tracing_cond_snapshot_data); | |
1054 | ||
1c5eb448 SRV |
1055 | static int resize_buffer_duplicate_size(struct array_buffer *trace_buf, |
1056 | struct array_buffer *size_buf, int cpu_id); | |
1057 | static void set_buffer_entries(struct array_buffer *buf, unsigned long val); | |
3209cff4 | 1058 | |
2824f503 | 1059 | int tracing_alloc_snapshot_instance(struct trace_array *tr) |
3209cff4 SRRH |
1060 | { |
1061 | int ret; | |
1062 | ||
1063 | if (!tr->allocated_snapshot) { | |
1064 | ||
1065 | /* allocate spare buffer */ | |
1066 | ret = resize_buffer_duplicate_size(&tr->max_buffer, | |
1c5eb448 | 1067 | &tr->array_buffer, RING_BUFFER_ALL_CPUS); |
3209cff4 SRRH |
1068 | if (ret < 0) |
1069 | return ret; | |
1070 | ||
1071 | tr->allocated_snapshot = true; | |
1072 | } | |
1073 | ||
1074 | return 0; | |
1075 | } | |
1076 | ||
ad1438a0 | 1077 | static void free_snapshot(struct trace_array *tr) |
3209cff4 SRRH |
1078 | { |
1079 | /* | |
1080 | * We don't free the ring buffer. instead, resize it because | |
1081 | * The max_tr ring buffer has some state (e.g. ring->clock) and | |
1082 | * we want preserve it. | |
1083 | */ | |
1084 | ring_buffer_resize(tr->max_buffer.buffer, 1, RING_BUFFER_ALL_CPUS); | |
1085 | set_buffer_entries(&tr->max_buffer, 1); | |
1086 | tracing_reset_online_cpus(&tr->max_buffer); | |
1087 | tr->allocated_snapshot = false; | |
1088 | } | |
ad909e21 | 1089 | |
93e31ffb TZ |
1090 | /** |
1091 | * tracing_alloc_snapshot - allocate snapshot buffer. | |
1092 | * | |
1093 | * This only allocates the snapshot buffer if it isn't already | |
1094 | * allocated - it doesn't also take a snapshot. | |
1095 | * | |
1096 | * This is meant to be used in cases where the snapshot buffer needs | |
1097 | * to be set up for events that can't sleep but need to be able to | |
1098 | * trigger a snapshot. | |
1099 | */ | |
1100 | int tracing_alloc_snapshot(void) | |
1101 | { | |
1102 | struct trace_array *tr = &global_trace; | |
1103 | int ret; | |
1104 | ||
2824f503 | 1105 | ret = tracing_alloc_snapshot_instance(tr); |
93e31ffb TZ |
1106 | WARN_ON(ret < 0); |
1107 | ||
1108 | return ret; | |
1109 | } | |
1110 | EXPORT_SYMBOL_GPL(tracing_alloc_snapshot); | |
1111 | ||
ad909e21 | 1112 | /** |
5a93bae2 | 1113 | * tracing_snapshot_alloc - allocate and take a snapshot of the current buffer. |
ad909e21 | 1114 | * |
5a93bae2 | 1115 | * This is similar to tracing_snapshot(), but it will allocate the |
ad909e21 SRRH |
1116 | * snapshot buffer if it isn't already allocated. Use this only |
1117 | * where it is safe to sleep, as the allocation may sleep. | |
1118 | * | |
1119 | * This causes a swap between the snapshot buffer and the current live | |
1120 | * tracing buffer. You can use this to take snapshots of the live | |
1121 | * trace when some condition is triggered, but continue to trace. | |
1122 | */ | |
1123 | void tracing_snapshot_alloc(void) | |
1124 | { | |
ad909e21 SRRH |
1125 | int ret; |
1126 | ||
93e31ffb TZ |
1127 | ret = tracing_alloc_snapshot(); |
1128 | if (ret < 0) | |
3209cff4 | 1129 | return; |
ad909e21 SRRH |
1130 | |
1131 | tracing_snapshot(); | |
1132 | } | |
1b22e382 | 1133 | EXPORT_SYMBOL_GPL(tracing_snapshot_alloc); |
a35873a0 TZ |
1134 | |
1135 | /** | |
1136 | * tracing_snapshot_cond_enable - enable conditional snapshot for an instance | |
1137 | * @tr: The tracing instance | |
1138 | * @cond_data: User data to associate with the snapshot | |
1139 | * @update: Implementation of the cond_snapshot update function | |
1140 | * | |
1141 | * Check whether the conditional snapshot for the given instance has | |
1142 | * already been enabled, or if the current tracer is already using a | |
1143 | * snapshot; if so, return -EBUSY, else create a cond_snapshot and | |
1144 | * save the cond_data and update function inside. | |
1145 | * | |
1146 | * Returns 0 if successful, error otherwise. | |
1147 | */ | |
1148 | int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, | |
1149 | cond_update_fn_t update) | |
1150 | { | |
1151 | struct cond_snapshot *cond_snapshot; | |
1152 | int ret = 0; | |
1153 | ||
1154 | cond_snapshot = kzalloc(sizeof(*cond_snapshot), GFP_KERNEL); | |
1155 | if (!cond_snapshot) | |
1156 | return -ENOMEM; | |
1157 | ||
1158 | cond_snapshot->cond_data = cond_data; | |
1159 | cond_snapshot->update = update; | |
1160 | ||
1161 | mutex_lock(&trace_types_lock); | |
1162 | ||
1163 | ret = tracing_alloc_snapshot_instance(tr); | |
1164 | if (ret) | |
1165 | goto fail_unlock; | |
1166 | ||
1167 | if (tr->current_trace->use_max_tr) { | |
1168 | ret = -EBUSY; | |
1169 | goto fail_unlock; | |
1170 | } | |
1171 | ||
1c347a94 SRV |
1172 | /* |
1173 | * The cond_snapshot can only change to NULL without the | |
1174 | * trace_types_lock. We don't care if we race with it going | |
1175 | * to NULL, but we want to make sure that it's not set to | |
1176 | * something other than NULL when we get here, which we can | |
1177 | * do safely with only holding the trace_types_lock and not | |
1178 | * having to take the max_lock. | |
1179 | */ | |
a35873a0 TZ |
1180 | if (tr->cond_snapshot) { |
1181 | ret = -EBUSY; | |
1182 | goto fail_unlock; | |
1183 | } | |
1184 | ||
1185 | arch_spin_lock(&tr->max_lock); | |
1186 | tr->cond_snapshot = cond_snapshot; | |
1187 | arch_spin_unlock(&tr->max_lock); | |
1188 | ||
1189 | mutex_unlock(&trace_types_lock); | |
1190 | ||
1191 | return ret; | |
1192 | ||
1193 | fail_unlock: | |
1194 | mutex_unlock(&trace_types_lock); | |
1195 | kfree(cond_snapshot); | |
1196 | return ret; | |
1197 | } | |
1198 | EXPORT_SYMBOL_GPL(tracing_snapshot_cond_enable); | |
1199 | ||
1200 | /** | |
1201 | * tracing_snapshot_cond_disable - disable conditional snapshot for an instance | |
1202 | * @tr: The tracing instance | |
1203 | * | |
1204 | * Check whether the conditional snapshot for the given instance is | |
1205 | * enabled; if so, free the cond_snapshot associated with it, | |
1206 | * otherwise return -EINVAL. | |
1207 | * | |
1208 | * Returns 0 if successful, error otherwise. | |
1209 | */ | |
1210 | int tracing_snapshot_cond_disable(struct trace_array *tr) | |
1211 | { | |
1212 | int ret = 0; | |
1213 | ||
1214 | arch_spin_lock(&tr->max_lock); | |
1215 | ||
1216 | if (!tr->cond_snapshot) | |
1217 | ret = -EINVAL; | |
1218 | else { | |
1219 | kfree(tr->cond_snapshot); | |
1220 | tr->cond_snapshot = NULL; | |
1221 | } | |
1222 | ||
1223 | arch_spin_unlock(&tr->max_lock); | |
1224 | ||
1225 | return ret; | |
1226 | } | |
1227 | EXPORT_SYMBOL_GPL(tracing_snapshot_cond_disable); | |
ad909e21 SRRH |
1228 | #else |
1229 | void tracing_snapshot(void) | |
1230 | { | |
1231 | WARN_ONCE(1, "Snapshot feature not enabled, but internal snapshot used"); | |
1232 | } | |
1b22e382 | 1233 | EXPORT_SYMBOL_GPL(tracing_snapshot); |
a35873a0 TZ |
1234 | void tracing_snapshot_cond(struct trace_array *tr, void *cond_data) |
1235 | { | |
1236 | WARN_ONCE(1, "Snapshot feature not enabled, but internal conditional snapshot used"); | |
1237 | } | |
1238 | EXPORT_SYMBOL_GPL(tracing_snapshot_cond); | |
93e31ffb TZ |
1239 | int tracing_alloc_snapshot(void) |
1240 | { | |
1241 | WARN_ONCE(1, "Snapshot feature not enabled, but snapshot allocation used"); | |
1242 | return -ENODEV; | |
1243 | } | |
1244 | EXPORT_SYMBOL_GPL(tracing_alloc_snapshot); | |
ad909e21 SRRH |
1245 | void tracing_snapshot_alloc(void) |
1246 | { | |
1247 | /* Give warning */ | |
1248 | tracing_snapshot(); | |
1249 | } | |
1b22e382 | 1250 | EXPORT_SYMBOL_GPL(tracing_snapshot_alloc); |
a35873a0 TZ |
1251 | void *tracing_cond_snapshot_data(struct trace_array *tr) |
1252 | { | |
1253 | return NULL; | |
1254 | } | |
1255 | EXPORT_SYMBOL_GPL(tracing_cond_snapshot_data); | |
1256 | int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update) | |
1257 | { | |
1258 | return -ENODEV; | |
1259 | } | |
1260 | EXPORT_SYMBOL_GPL(tracing_snapshot_cond_enable); | |
1261 | int tracing_snapshot_cond_disable(struct trace_array *tr) | |
1262 | { | |
1263 | return false; | |
1264 | } | |
1265 | EXPORT_SYMBOL_GPL(tracing_snapshot_cond_disable); | |
ad909e21 SRRH |
1266 | #endif /* CONFIG_TRACER_SNAPSHOT */ |
1267 | ||
2290f2c5 | 1268 | void tracer_tracing_off(struct trace_array *tr) |
10246fa3 | 1269 | { |
1c5eb448 SRV |
1270 | if (tr->array_buffer.buffer) |
1271 | ring_buffer_record_off(tr->array_buffer.buffer); | |
10246fa3 SRRH |
1272 | /* |
1273 | * This flag is looked at when buffers haven't been allocated | |
1274 | * yet, or by some tracers (like irqsoff), that just want to | |
1275 | * know if the ring buffer has been disabled, but it can handle | |
1276 | * races of where it gets disabled but we still do a record. | |
1277 | * As the check is in the fast path of the tracers, it is more | |
1278 | * important to be fast than accurate. | |
1279 | */ | |
1280 | tr->buffer_disabled = 1; | |
1281 | /* Make the flag seen by readers */ | |
1282 | smp_wmb(); | |
1283 | } | |
1284 | ||
499e5470 SR |
1285 | /** |
1286 | * tracing_off - turn off tracing buffers | |
1287 | * | |
1288 | * This function stops the tracing buffers from recording data. | |
1289 | * It does not disable any overhead the tracers themselves may | |
1290 | * be causing. This function simply causes all recording to | |
1291 | * the ring buffers to fail. | |
1292 | */ | |
1293 | void tracing_off(void) | |
1294 | { | |
10246fa3 | 1295 | tracer_tracing_off(&global_trace); |
499e5470 SR |
1296 | } |
1297 | EXPORT_SYMBOL_GPL(tracing_off); | |
1298 | ||
de7edd31 SRRH |
1299 | void disable_trace_on_warning(void) |
1300 | { | |
1301 | if (__disable_trace_on_warning) | |
1302 | tracing_off(); | |
1303 | } | |
1304 | ||
10246fa3 SRRH |
1305 | /** |
1306 | * tracer_tracing_is_on - show real state of ring buffer enabled | |
1307 | * @tr : the trace array to know if ring buffer is enabled | |
1308 | * | |
1309 | * Shows real state of the ring buffer if it is enabled or not. | |
1310 | */ | |
ec573508 | 1311 | bool tracer_tracing_is_on(struct trace_array *tr) |
10246fa3 | 1312 | { |
1c5eb448 SRV |
1313 | if (tr->array_buffer.buffer) |
1314 | return ring_buffer_record_is_on(tr->array_buffer.buffer); | |
10246fa3 SRRH |
1315 | return !tr->buffer_disabled; |
1316 | } | |
1317 | ||
499e5470 SR |
1318 | /** |
1319 | * tracing_is_on - show state of ring buffers enabled | |
1320 | */ | |
1321 | int tracing_is_on(void) | |
1322 | { | |
10246fa3 | 1323 | return tracer_tracing_is_on(&global_trace); |
499e5470 SR |
1324 | } |
1325 | EXPORT_SYMBOL_GPL(tracing_is_on); | |
1326 | ||
3928a8a2 | 1327 | static int __init set_buf_size(char *str) |
bc0c38d1 | 1328 | { |
3928a8a2 | 1329 | unsigned long buf_size; |
c6caeeb1 | 1330 | |
bc0c38d1 SR |
1331 | if (!str) |
1332 | return 0; | |
9d612bef | 1333 | buf_size = memparse(str, &str); |
c6caeeb1 | 1334 | /* nr_entries can not be zero */ |
9d612bef | 1335 | if (buf_size == 0) |
c6caeeb1 | 1336 | return 0; |
3928a8a2 | 1337 | trace_buf_size = buf_size; |
bc0c38d1 SR |
1338 | return 1; |
1339 | } | |
3928a8a2 | 1340 | __setup("trace_buf_size=", set_buf_size); |
bc0c38d1 | 1341 | |
0e950173 TB |
1342 | static int __init set_tracing_thresh(char *str) |
1343 | { | |
87abb3b1 | 1344 | unsigned long threshold; |
0e950173 TB |
1345 | int ret; |
1346 | ||
1347 | if (!str) | |
1348 | return 0; | |
bcd83ea6 | 1349 | ret = kstrtoul(str, 0, &threshold); |
0e950173 TB |
1350 | if (ret < 0) |
1351 | return 0; | |
87abb3b1 | 1352 | tracing_thresh = threshold * 1000; |
0e950173 TB |
1353 | return 1; |
1354 | } | |
1355 | __setup("tracing_thresh=", set_tracing_thresh); | |
1356 | ||
57f50be1 SR |
1357 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
1358 | { | |
1359 | return nsecs / 1000; | |
1360 | } | |
1361 | ||
a3418a36 SRRH |
1362 | /* |
1363 | * TRACE_FLAGS is defined as a tuple matching bit masks with strings. | |
f57a4143 | 1364 | * It uses C(a, b) where 'a' is the eval (enum) name and 'b' is the string that |
a3418a36 | 1365 | * matches it. By defining "C(a, b) b", TRACE_FLAGS becomes a list |
f57a4143 | 1366 | * of strings in the order that the evals (enum) were defined. |
a3418a36 SRRH |
1367 | */ |
1368 | #undef C | |
1369 | #define C(a, b) b | |
1370 | ||
4fcdae83 | 1371 | /* These must match the bit postions in trace_iterator_flags */ |
bc0c38d1 | 1372 | static const char *trace_options[] = { |
a3418a36 | 1373 | TRACE_FLAGS |
bc0c38d1 SR |
1374 | NULL |
1375 | }; | |
1376 | ||
5079f326 Z |
1377 | static struct { |
1378 | u64 (*func)(void); | |
1379 | const char *name; | |
8be0709f | 1380 | int in_ns; /* is this clock in nanoseconds? */ |
5079f326 | 1381 | } trace_clocks[] = { |
1b3e5c09 TG |
1382 | { trace_clock_local, "local", 1 }, |
1383 | { trace_clock_global, "global", 1 }, | |
1384 | { trace_clock_counter, "counter", 0 }, | |
e7fda6c4 | 1385 | { trace_clock_jiffies, "uptime", 0 }, |
1b3e5c09 TG |
1386 | { trace_clock, "perf", 1 }, |
1387 | { ktime_get_mono_fast_ns, "mono", 1 }, | |
aabfa5f2 | 1388 | { ktime_get_raw_fast_ns, "mono_raw", 1 }, |
a3ed0e43 | 1389 | { ktime_get_boot_fast_ns, "boot", 1 }, |
8cbd9cc6 | 1390 | ARCH_TRACE_CLOCKS |
5079f326 Z |
1391 | }; |
1392 | ||
860f9f6b TZ |
1393 | bool trace_clock_in_ns(struct trace_array *tr) |
1394 | { | |
1395 | if (trace_clocks[tr->clock_id].in_ns) | |
1396 | return true; | |
1397 | ||
1398 | return false; | |
1399 | } | |
1400 | ||
b63f39ea | 1401 | /* |
1402 | * trace_parser_get_init - gets the buffer for trace parser | |
1403 | */ | |
1404 | int trace_parser_get_init(struct trace_parser *parser, int size) | |
1405 | { | |
1406 | memset(parser, 0, sizeof(*parser)); | |
1407 | ||
1408 | parser->buffer = kmalloc(size, GFP_KERNEL); | |
1409 | if (!parser->buffer) | |
1410 | return 1; | |
1411 | ||
1412 | parser->size = size; | |
1413 | return 0; | |
1414 | } | |
1415 | ||
1416 | /* | |
1417 | * trace_parser_put - frees the buffer for trace parser | |
1418 | */ | |
1419 | void trace_parser_put(struct trace_parser *parser) | |
1420 | { | |
1421 | kfree(parser->buffer); | |
0e684b65 | 1422 | parser->buffer = NULL; |
b63f39ea | 1423 | } |
1424 | ||
1425 | /* | |
1426 | * trace_get_user - reads the user input string separated by space | |
1427 | * (matched by isspace(ch)) | |
1428 | * | |
1429 | * For each string found the 'struct trace_parser' is updated, | |
1430 | * and the function returns. | |
1431 | * | |
1432 | * Returns number of bytes read. | |
1433 | * | |
1434 | * See kernel/trace/trace.h for 'struct trace_parser' details. | |
1435 | */ | |
1436 | int trace_get_user(struct trace_parser *parser, const char __user *ubuf, | |
1437 | size_t cnt, loff_t *ppos) | |
1438 | { | |
1439 | char ch; | |
1440 | size_t read = 0; | |
1441 | ssize_t ret; | |
1442 | ||
1443 | if (!*ppos) | |
1444 | trace_parser_clear(parser); | |
1445 | ||
1446 | ret = get_user(ch, ubuf++); | |
1447 | if (ret) | |
1448 | goto out; | |
1449 | ||
1450 | read++; | |
1451 | cnt--; | |
1452 | ||
1453 | /* | |
1454 | * The parser is not finished with the last write, | |
1455 | * continue reading the user input without skipping spaces. | |
1456 | */ | |
1457 | if (!parser->cont) { | |
1458 | /* skip white space */ | |
1459 | while (cnt && isspace(ch)) { | |
1460 | ret = get_user(ch, ubuf++); | |
1461 | if (ret) | |
1462 | goto out; | |
1463 | read++; | |
1464 | cnt--; | |
1465 | } | |
1466 | ||
76638d96 CD |
1467 | parser->idx = 0; |
1468 | ||
b63f39ea | 1469 | /* only spaces were written */ |
921a7acd | 1470 | if (isspace(ch) || !ch) { |
b63f39ea | 1471 | *ppos += read; |
1472 | ret = read; | |
1473 | goto out; | |
1474 | } | |
b63f39ea | 1475 | } |
1476 | ||
1477 | /* read the non-space input */ | |
921a7acd | 1478 | while (cnt && !isspace(ch) && ch) { |
3c235a33 | 1479 | if (parser->idx < parser->size - 1) |
b63f39ea | 1480 | parser->buffer[parser->idx++] = ch; |
1481 | else { | |
1482 | ret = -EINVAL; | |
1483 | goto out; | |
1484 | } | |
1485 | ret = get_user(ch, ubuf++); | |
1486 | if (ret) | |
1487 | goto out; | |
1488 | read++; | |
1489 | cnt--; | |
1490 | } | |
1491 | ||
1492 | /* We either got finished input or we have to wait for another call. */ | |
921a7acd | 1493 | if (isspace(ch) || !ch) { |
b63f39ea | 1494 | parser->buffer[parser->idx] = 0; |
1495 | parser->cont = false; | |
057db848 | 1496 | } else if (parser->idx < parser->size - 1) { |
b63f39ea | 1497 | parser->cont = true; |
1498 | parser->buffer[parser->idx++] = ch; | |
f4d0706c CD |
1499 | /* Make sure the parsed string always terminates with '\0'. */ |
1500 | parser->buffer[parser->idx] = 0; | |
057db848 SR |
1501 | } else { |
1502 | ret = -EINVAL; | |
1503 | goto out; | |
b63f39ea | 1504 | } |
1505 | ||
1506 | *ppos += read; | |
1507 | ret = read; | |
1508 | ||
1509 | out: | |
1510 | return ret; | |
1511 | } | |
1512 | ||
3a161d99 | 1513 | /* TODO add a seq_buf_to_buffer() */ |
b8b94265 | 1514 | static ssize_t trace_seq_to_buffer(struct trace_seq *s, void *buf, size_t cnt) |
3c56819b EGM |
1515 | { |
1516 | int len; | |
3c56819b | 1517 | |
5ac48378 | 1518 | if (trace_seq_used(s) <= s->seq.readpos) |
3c56819b EGM |
1519 | return -EBUSY; |
1520 | ||
5ac48378 | 1521 | len = trace_seq_used(s) - s->seq.readpos; |
3c56819b EGM |
1522 | if (cnt > len) |
1523 | cnt = len; | |
3a161d99 | 1524 | memcpy(buf, s->buffer + s->seq.readpos, cnt); |
3c56819b | 1525 | |
3a161d99 | 1526 | s->seq.readpos += cnt; |
3c56819b EGM |
1527 | return cnt; |
1528 | } | |
1529 | ||
0e950173 | 1530 | unsigned long __read_mostly tracing_thresh; |
91edde2e VRB |
1531 | static const struct file_operations tracing_max_lat_fops; |
1532 | ||
1533 | #if (defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)) && \ | |
1534 | defined(CONFIG_FSNOTIFY) | |
1535 | ||
1536 | static struct workqueue_struct *fsnotify_wq; | |
1537 | ||
1538 | static void latency_fsnotify_workfn(struct work_struct *work) | |
1539 | { | |
1540 | struct trace_array *tr = container_of(work, struct trace_array, | |
1541 | fsnotify_work); | |
1542 | fsnotify(tr->d_max_latency->d_inode, FS_MODIFY, | |
1543 | tr->d_max_latency->d_inode, FSNOTIFY_EVENT_INODE, NULL, 0); | |
1544 | } | |
1545 | ||
1546 | static void latency_fsnotify_workfn_irq(struct irq_work *iwork) | |
1547 | { | |
1548 | struct trace_array *tr = container_of(iwork, struct trace_array, | |
1549 | fsnotify_irqwork); | |
1550 | queue_work(fsnotify_wq, &tr->fsnotify_work); | |
1551 | } | |
1552 | ||
1553 | static void trace_create_maxlat_file(struct trace_array *tr, | |
1554 | struct dentry *d_tracer) | |
1555 | { | |
1556 | INIT_WORK(&tr->fsnotify_work, latency_fsnotify_workfn); | |
1557 | init_irq_work(&tr->fsnotify_irqwork, latency_fsnotify_workfn_irq); | |
1558 | tr->d_max_latency = trace_create_file("tracing_max_latency", 0644, | |
1559 | d_tracer, &tr->max_latency, | |
1560 | &tracing_max_lat_fops); | |
1561 | } | |
1562 | ||
1563 | __init static int latency_fsnotify_init(void) | |
1564 | { | |
1565 | fsnotify_wq = alloc_workqueue("tr_max_lat_wq", | |
1566 | WQ_UNBOUND | WQ_HIGHPRI, 0); | |
1567 | if (!fsnotify_wq) { | |
1568 | pr_err("Unable to allocate tr_max_lat_wq\n"); | |
1569 | return -ENOMEM; | |
1570 | } | |
1571 | return 0; | |
1572 | } | |
1573 | ||
1574 | late_initcall_sync(latency_fsnotify_init); | |
1575 | ||
1576 | void latency_fsnotify(struct trace_array *tr) | |
1577 | { | |
1578 | if (!fsnotify_wq) | |
1579 | return; | |
1580 | /* | |
1581 | * We cannot call queue_work(&tr->fsnotify_work) from here because it's | |
1582 | * possible that we are called from __schedule() or do_idle(), which | |
1583 | * could cause a deadlock. | |
1584 | */ | |
1585 | irq_work_queue(&tr->fsnotify_irqwork); | |
1586 | } | |
1587 | ||
1588 | /* | |
1589 | * (defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)) && \ | |
1590 | * defined(CONFIG_FSNOTIFY) | |
1591 | */ | |
1592 | #else | |
1593 | ||
1594 | #define trace_create_maxlat_file(tr, d_tracer) \ | |
1595 | trace_create_file("tracing_max_latency", 0644, d_tracer, \ | |
1596 | &tr->max_latency, &tracing_max_lat_fops) | |
1597 | ||
1598 | #endif | |
0e950173 | 1599 | |
5d4a9dba | 1600 | #ifdef CONFIG_TRACER_MAX_TRACE |
5d4a9dba SR |
1601 | /* |
1602 | * Copy the new maximum trace into the separate maximum-trace | |
1603 | * structure. (this way the maximum trace is permanently saved, | |
5a93bae2 | 1604 | * for later retrieval via /sys/kernel/tracing/tracing_max_latency) |
5d4a9dba SR |
1605 | */ |
1606 | static void | |
1607 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) | |
1608 | { | |
1c5eb448 SRV |
1609 | struct array_buffer *trace_buf = &tr->array_buffer; |
1610 | struct array_buffer *max_buf = &tr->max_buffer; | |
12883efb SRRH |
1611 | struct trace_array_cpu *data = per_cpu_ptr(trace_buf->data, cpu); |
1612 | struct trace_array_cpu *max_data = per_cpu_ptr(max_buf->data, cpu); | |
5d4a9dba | 1613 | |
12883efb SRRH |
1614 | max_buf->cpu = cpu; |
1615 | max_buf->time_start = data->preempt_timestamp; | |
5d4a9dba | 1616 | |
6d9b3fa5 | 1617 | max_data->saved_latency = tr->max_latency; |
8248ac05 SR |
1618 | max_data->critical_start = data->critical_start; |
1619 | max_data->critical_end = data->critical_end; | |
5d4a9dba | 1620 | |
85f726a3 | 1621 | strncpy(max_data->comm, tsk->comm, TASK_COMM_LEN); |
8248ac05 | 1622 | max_data->pid = tsk->pid; |
f17a5194 SRRH |
1623 | /* |
1624 | * If tsk == current, then use current_uid(), as that does not use | |
1625 | * RCU. The irq tracer can be called out of RCU scope. | |
1626 | */ | |
1627 | if (tsk == current) | |
1628 | max_data->uid = current_uid(); | |
1629 | else | |
1630 | max_data->uid = task_uid(tsk); | |
1631 | ||
8248ac05 SR |
1632 | max_data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; |
1633 | max_data->policy = tsk->policy; | |
1634 | max_data->rt_priority = tsk->rt_priority; | |
5d4a9dba SR |
1635 | |
1636 | /* record this tasks comm */ | |
1637 | tracing_record_cmdline(tsk); | |
91edde2e | 1638 | latency_fsnotify(tr); |
5d4a9dba SR |
1639 | } |
1640 | ||
4fcdae83 SR |
1641 | /** |
1642 | * update_max_tr - snapshot all trace buffers from global_trace to max_tr | |
1643 | * @tr: tracer | |
1644 | * @tsk: the task with the latency | |
1645 | * @cpu: The cpu that initiated the trace. | |
a35873a0 | 1646 | * @cond_data: User data associated with a conditional snapshot |
4fcdae83 SR |
1647 | * |
1648 | * Flip the buffers between the @tr and the max_tr and record information | |
1649 | * about which task was the cause of this latency. | |
1650 | */ | |
e309b41d | 1651 | void |
a35873a0 TZ |
1652 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu, |
1653 | void *cond_data) | |
bc0c38d1 | 1654 | { |
2b6080f2 | 1655 | if (tr->stop_count) |
b8de7bd1 SR |
1656 | return; |
1657 | ||
4c11d7ae | 1658 | WARN_ON_ONCE(!irqs_disabled()); |
34600f0e | 1659 | |
45ad21ca | 1660 | if (!tr->allocated_snapshot) { |
debdd57f | 1661 | /* Only the nop tracer should hit this when disabling */ |
2b6080f2 | 1662 | WARN_ON_ONCE(tr->current_trace != &nop_trace); |
34600f0e | 1663 | return; |
debdd57f | 1664 | } |
34600f0e | 1665 | |
0b9b12c1 | 1666 | arch_spin_lock(&tr->max_lock); |
3928a8a2 | 1667 | |
1c5eb448 SRV |
1668 | /* Inherit the recordable setting from array_buffer */ |
1669 | if (ring_buffer_record_is_set_on(tr->array_buffer.buffer)) | |
73c8d894 MH |
1670 | ring_buffer_record_on(tr->max_buffer.buffer); |
1671 | else | |
1672 | ring_buffer_record_off(tr->max_buffer.buffer); | |
1673 | ||
a35873a0 TZ |
1674 | #ifdef CONFIG_TRACER_SNAPSHOT |
1675 | if (tr->cond_snapshot && !tr->cond_snapshot->update(tr, cond_data)) | |
1676 | goto out_unlock; | |
1677 | #endif | |
1c5eb448 | 1678 | swap(tr->array_buffer.buffer, tr->max_buffer.buffer); |
3928a8a2 | 1679 | |
bc0c38d1 | 1680 | __update_max_tr(tr, tsk, cpu); |
a35873a0 TZ |
1681 | |
1682 | out_unlock: | |
0b9b12c1 | 1683 | arch_spin_unlock(&tr->max_lock); |
bc0c38d1 SR |
1684 | } |
1685 | ||
1686 | /** | |
1687 | * update_max_tr_single - only copy one trace over, and reset the rest | |
c68c9ec1 JK |
1688 | * @tr: tracer |
1689 | * @tsk: task with the latency | |
1690 | * @cpu: the cpu of the buffer to copy. | |
4fcdae83 SR |
1691 | * |
1692 | * Flip the trace of a single CPU buffer between the @tr and the max_tr. | |
bc0c38d1 | 1693 | */ |
e309b41d | 1694 | void |
bc0c38d1 SR |
1695 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
1696 | { | |
3928a8a2 | 1697 | int ret; |
bc0c38d1 | 1698 | |
2b6080f2 | 1699 | if (tr->stop_count) |
b8de7bd1 SR |
1700 | return; |
1701 | ||
4c11d7ae | 1702 | WARN_ON_ONCE(!irqs_disabled()); |
6c24499f | 1703 | if (!tr->allocated_snapshot) { |
2930e04d | 1704 | /* Only the nop tracer should hit this when disabling */ |
9e8529af | 1705 | WARN_ON_ONCE(tr->current_trace != &nop_trace); |
ef710e10 | 1706 | return; |
2930e04d | 1707 | } |
ef710e10 | 1708 | |
0b9b12c1 | 1709 | arch_spin_lock(&tr->max_lock); |
bc0c38d1 | 1710 | |
1c5eb448 | 1711 | ret = ring_buffer_swap_cpu(tr->max_buffer.buffer, tr->array_buffer.buffer, cpu); |
3928a8a2 | 1712 | |
e8165dbb SR |
1713 | if (ret == -EBUSY) { |
1714 | /* | |
1715 | * We failed to swap the buffer due to a commit taking | |
1716 | * place on this CPU. We fail to record, but we reset | |
1717 | * the max trace buffer (no one writes directly to it) | |
1718 | * and flag that it failed. | |
1719 | */ | |
12883efb | 1720 | trace_array_printk_buf(tr->max_buffer.buffer, _THIS_IP_, |
e8165dbb SR |
1721 | "Failed to swap buffers due to commit in progress\n"); |
1722 | } | |
1723 | ||
e8165dbb | 1724 | WARN_ON_ONCE(ret && ret != -EAGAIN && ret != -EBUSY); |
bc0c38d1 SR |
1725 | |
1726 | __update_max_tr(tr, tsk, cpu); | |
0b9b12c1 | 1727 | arch_spin_unlock(&tr->max_lock); |
bc0c38d1 | 1728 | } |
5d4a9dba | 1729 | #endif /* CONFIG_TRACER_MAX_TRACE */ |
bc0c38d1 | 1730 | |
2c2b0a78 | 1731 | static int wait_on_pipe(struct trace_iterator *iter, int full) |
0d5c6e1c | 1732 | { |
15693458 SRRH |
1733 | /* Iterators are static, they should be filled or empty */ |
1734 | if (trace_buffer_iter(iter, iter->cpu_file)) | |
8b8b3683 | 1735 | return 0; |
0d5c6e1c | 1736 | |
1c5eb448 | 1737 | return ring_buffer_wait(iter->array_buffer->buffer, iter->cpu_file, |
e30f53aa | 1738 | full); |
0d5c6e1c SR |
1739 | } |
1740 | ||
f4e781c0 | 1741 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
9afecfbb SRV |
1742 | static bool selftests_can_run; |
1743 | ||
1744 | struct trace_selftests { | |
1745 | struct list_head list; | |
1746 | struct tracer *type; | |
1747 | }; | |
1748 | ||
1749 | static LIST_HEAD(postponed_selftests); | |
1750 | ||
1751 | static int save_selftest(struct tracer *type) | |
1752 | { | |
1753 | struct trace_selftests *selftest; | |
1754 | ||
1755 | selftest = kmalloc(sizeof(*selftest), GFP_KERNEL); | |
1756 | if (!selftest) | |
1757 | return -ENOMEM; | |
1758 | ||
1759 | selftest->type = type; | |
1760 | list_add(&selftest->list, &postponed_selftests); | |
1761 | return 0; | |
1762 | } | |
1763 | ||
f4e781c0 SRRH |
1764 | static int run_tracer_selftest(struct tracer *type) |
1765 | { | |
1766 | struct trace_array *tr = &global_trace; | |
1767 | struct tracer *saved_tracer = tr->current_trace; | |
1768 | int ret; | |
0d5c6e1c | 1769 | |
f4e781c0 SRRH |
1770 | if (!type->selftest || tracing_selftest_disabled) |
1771 | return 0; | |
0d5c6e1c | 1772 | |
9afecfbb SRV |
1773 | /* |
1774 | * If a tracer registers early in boot up (before scheduling is | |
1775 | * initialized and such), then do not run its selftests yet. | |
1776 | * Instead, run it a little later in the boot process. | |
1777 | */ | |
1778 | if (!selftests_can_run) | |
1779 | return save_selftest(type); | |
1780 | ||
0d5c6e1c | 1781 | /* |
f4e781c0 SRRH |
1782 | * Run a selftest on this tracer. |
1783 | * Here we reset the trace buffer, and set the current | |
1784 | * tracer to be this tracer. The tracer can then run some | |
1785 | * internal tracing to verify that everything is in order. | |
1786 | * If we fail, we do not register this tracer. | |
0d5c6e1c | 1787 | */ |
1c5eb448 | 1788 | tracing_reset_online_cpus(&tr->array_buffer); |
0d5c6e1c | 1789 | |
f4e781c0 SRRH |
1790 | tr->current_trace = type; |
1791 | ||
1792 | #ifdef CONFIG_TRACER_MAX_TRACE | |
1793 | if (type->use_max_tr) { | |
1794 | /* If we expanded the buffers, make sure the max is expanded too */ | |
1795 | if (ring_buffer_expanded) | |
1796 | ring_buffer_resize(tr->max_buffer.buffer, trace_buf_size, | |
1797 | RING_BUFFER_ALL_CPUS); | |
1798 | tr->allocated_snapshot = true; | |
1799 | } | |
1800 | #endif | |
1801 | ||
1802 | /* the test is responsible for initializing and enabling */ | |
1803 | pr_info("Testing tracer %s: ", type->name); | |
1804 | ret = type->selftest(type, tr); | |
1805 | /* the test is responsible for resetting too */ | |
1806 | tr->current_trace = saved_tracer; | |
1807 | if (ret) { | |
1808 | printk(KERN_CONT "FAILED!\n"); | |
1809 | /* Add the warning after printing 'FAILED' */ | |
1810 | WARN_ON(1); | |
1811 | return -1; | |
1812 | } | |
1813 | /* Only reset on passing, to avoid touching corrupted buffers */ | |
1c5eb448 | 1814 | tracing_reset_online_cpus(&tr->array_buffer); |
f4e781c0 SRRH |
1815 | |
1816 | #ifdef CONFIG_TRACER_MAX_TRACE | |
1817 | if (type->use_max_tr) { | |
1818 | tr->allocated_snapshot = false; | |
0d5c6e1c | 1819 | |
f4e781c0 SRRH |
1820 | /* Shrink the max buffer again */ |
1821 | if (ring_buffer_expanded) | |
1822 | ring_buffer_resize(tr->max_buffer.buffer, 1, | |
1823 | RING_BUFFER_ALL_CPUS); | |
1824 | } | |
1825 | #endif | |
1826 | ||
1827 | printk(KERN_CONT "PASSED\n"); | |
1828 | return 0; | |
1829 | } | |
9afecfbb SRV |
1830 | |
1831 | static __init int init_trace_selftests(void) | |
1832 | { | |
1833 | struct trace_selftests *p, *n; | |
1834 | struct tracer *t, **last; | |
1835 | int ret; | |
1836 | ||
1837 | selftests_can_run = true; | |
1838 | ||
1839 | mutex_lock(&trace_types_lock); | |
1840 | ||
1841 | if (list_empty(&postponed_selftests)) | |
1842 | goto out; | |
1843 | ||
1844 | pr_info("Running postponed tracer tests:\n"); | |
1845 | ||
78041c0c | 1846 | tracing_selftest_running = true; |
9afecfbb | 1847 | list_for_each_entry_safe(p, n, &postponed_selftests, list) { |
6fc2171c AR |
1848 | /* This loop can take minutes when sanitizers are enabled, so |
1849 | * lets make sure we allow RCU processing. | |
1850 | */ | |
1851 | cond_resched(); | |
9afecfbb SRV |
1852 | ret = run_tracer_selftest(p->type); |
1853 | /* If the test fails, then warn and remove from available_tracers */ | |
1854 | if (ret < 0) { | |
1855 | WARN(1, "tracer: %s failed selftest, disabling\n", | |
1856 | p->type->name); | |
1857 | last = &trace_types; | |
1858 | for (t = trace_types; t; t = t->next) { | |
1859 | if (t == p->type) { | |
1860 | *last = t->next; | |
1861 | break; | |
1862 | } | |
1863 | last = &t->next; | |
1864 | } | |
1865 | } | |
1866 | list_del(&p->list); | |
1867 | kfree(p); | |
1868 | } | |
78041c0c | 1869 | tracing_selftest_running = false; |
9afecfbb SRV |
1870 | |
1871 | out: | |
1872 | mutex_unlock(&trace_types_lock); | |
1873 | ||
1874 | return 0; | |
1875 | } | |
b9ef0326 | 1876 | core_initcall(init_trace_selftests); |
f4e781c0 SRRH |
1877 | #else |
1878 | static inline int run_tracer_selftest(struct tracer *type) | |
1879 | { | |
1880 | return 0; | |
0d5c6e1c | 1881 | } |
f4e781c0 | 1882 | #endif /* CONFIG_FTRACE_STARTUP_TEST */ |
0d5c6e1c | 1883 | |
41d9c0be SRRH |
1884 | static void add_tracer_options(struct trace_array *tr, struct tracer *t); |
1885 | ||
a4d1e688 JW |
1886 | static void __init apply_trace_boot_options(void); |
1887 | ||
4fcdae83 SR |
1888 | /** |
1889 | * register_tracer - register a tracer with the ftrace system. | |
c68c9ec1 | 1890 | * @type: the plugin for the tracer |
4fcdae83 SR |
1891 | * |
1892 | * Register a new plugin tracer. | |
1893 | */ | |
a4d1e688 | 1894 | int __init register_tracer(struct tracer *type) |
bc0c38d1 SR |
1895 | { |
1896 | struct tracer *t; | |
bc0c38d1 SR |
1897 | int ret = 0; |
1898 | ||
1899 | if (!type->name) { | |
1900 | pr_info("Tracer must have a name\n"); | |
1901 | return -1; | |
1902 | } | |
1903 | ||
24a461d5 | 1904 | if (strlen(type->name) >= MAX_TRACER_SIZE) { |
ee6c2c1b LZ |
1905 | pr_info("Tracer has a name longer than %d\n", MAX_TRACER_SIZE); |
1906 | return -1; | |
1907 | } | |
1908 | ||
a356646a | 1909 | if (security_locked_down(LOCKDOWN_TRACEFS)) { |
ee195452 | 1910 | pr_warn("Can not register tracer %s due to lockdown\n", |
a356646a SRV |
1911 | type->name); |
1912 | return -EPERM; | |
1913 | } | |
1914 | ||
bc0c38d1 | 1915 | mutex_lock(&trace_types_lock); |
86fa2f60 | 1916 | |
8e1b82e0 FW |
1917 | tracing_selftest_running = true; |
1918 | ||
bc0c38d1 SR |
1919 | for (t = trace_types; t; t = t->next) { |
1920 | if (strcmp(type->name, t->name) == 0) { | |
1921 | /* already found */ | |
ee6c2c1b | 1922 | pr_info("Tracer %s already registered\n", |
bc0c38d1 SR |
1923 | type->name); |
1924 | ret = -1; | |
1925 | goto out; | |
1926 | } | |
1927 | } | |
1928 | ||
adf9f195 FW |
1929 | if (!type->set_flag) |
1930 | type->set_flag = &dummy_set_flag; | |
d39cdd20 CH |
1931 | if (!type->flags) { |
1932 | /*allocate a dummy tracer_flags*/ | |
1933 | type->flags = kmalloc(sizeof(*type->flags), GFP_KERNEL); | |
c8ca003b CH |
1934 | if (!type->flags) { |
1935 | ret = -ENOMEM; | |
1936 | goto out; | |
1937 | } | |
d39cdd20 CH |
1938 | type->flags->val = 0; |
1939 | type->flags->opts = dummy_tracer_opt; | |
1940 | } else | |
adf9f195 FW |
1941 | if (!type->flags->opts) |
1942 | type->flags->opts = dummy_tracer_opt; | |
6eaaa5d5 | 1943 | |
d39cdd20 CH |
1944 | /* store the tracer for __set_tracer_option */ |
1945 | type->flags->trace = type; | |
1946 | ||
f4e781c0 SRRH |
1947 | ret = run_tracer_selftest(type); |
1948 | if (ret < 0) | |
1949 | goto out; | |
60a11774 | 1950 | |
bc0c38d1 SR |
1951 | type->next = trace_types; |
1952 | trace_types = type; | |
41d9c0be | 1953 | add_tracer_options(&global_trace, type); |
60a11774 | 1954 | |
bc0c38d1 | 1955 | out: |
8e1b82e0 | 1956 | tracing_selftest_running = false; |
bc0c38d1 SR |
1957 | mutex_unlock(&trace_types_lock); |
1958 | ||
dac74940 SR |
1959 | if (ret || !default_bootup_tracer) |
1960 | goto out_unlock; | |
1961 | ||
ee6c2c1b | 1962 | if (strncmp(default_bootup_tracer, type->name, MAX_TRACER_SIZE)) |
dac74940 SR |
1963 | goto out_unlock; |
1964 | ||
1965 | printk(KERN_INFO "Starting tracer '%s'\n", type->name); | |
1966 | /* Do we want this tracer to start on bootup? */ | |
607e2ea1 | 1967 | tracing_set_tracer(&global_trace, type->name); |
dac74940 | 1968 | default_bootup_tracer = NULL; |
a4d1e688 JW |
1969 | |
1970 | apply_trace_boot_options(); | |
1971 | ||
dac74940 | 1972 | /* disable other selftests, since this will break it. */ |
55034cd6 | 1973 | tracing_selftest_disabled = true; |
b2821ae6 | 1974 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
dac74940 SR |
1975 | printk(KERN_INFO "Disabling FTRACE selftests due to running tracer '%s'\n", |
1976 | type->name); | |
b2821ae6 | 1977 | #endif |
b2821ae6 | 1978 | |
dac74940 | 1979 | out_unlock: |
bc0c38d1 SR |
1980 | return ret; |
1981 | } | |
1982 | ||
1c5eb448 | 1983 | static void tracing_reset_cpu(struct array_buffer *buf, int cpu) |
f633903a | 1984 | { |
13292494 | 1985 | struct trace_buffer *buffer = buf->buffer; |
f633903a | 1986 | |
a5416411 HT |
1987 | if (!buffer) |
1988 | return; | |
1989 | ||
f633903a SR |
1990 | ring_buffer_record_disable(buffer); |
1991 | ||
1992 | /* Make sure all commits have finished */ | |
74401729 | 1993 | synchronize_rcu(); |
68179686 | 1994 | ring_buffer_reset_cpu(buffer, cpu); |
f633903a SR |
1995 | |
1996 | ring_buffer_record_enable(buffer); | |
1997 | } | |
1998 | ||
1c5eb448 | 1999 | void tracing_reset_online_cpus(struct array_buffer *buf) |
213cc060 | 2000 | { |
13292494 | 2001 | struct trace_buffer *buffer = buf->buffer; |
213cc060 PE |
2002 | int cpu; |
2003 | ||
a5416411 HT |
2004 | if (!buffer) |
2005 | return; | |
2006 | ||
621968cd SR |
2007 | ring_buffer_record_disable(buffer); |
2008 | ||
2009 | /* Make sure all commits have finished */ | |
74401729 | 2010 | synchronize_rcu(); |
621968cd | 2011 | |
9457158b | 2012 | buf->time_start = buffer_ftrace_now(buf, buf->cpu); |
213cc060 PE |
2013 | |
2014 | for_each_online_cpu(cpu) | |
68179686 | 2015 | ring_buffer_reset_cpu(buffer, cpu); |
621968cd SR |
2016 | |
2017 | ring_buffer_record_enable(buffer); | |
213cc060 PE |
2018 | } |
2019 | ||
09d8091c | 2020 | /* Must have trace_types_lock held */ |
873c642f | 2021 | void tracing_reset_all_online_cpus(void) |
9456f0fa | 2022 | { |
873c642f SRRH |
2023 | struct trace_array *tr; |
2024 | ||
873c642f | 2025 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
065e63f9 SRV |
2026 | if (!tr->clear_trace) |
2027 | continue; | |
2028 | tr->clear_trace = false; | |
1c5eb448 | 2029 | tracing_reset_online_cpus(&tr->array_buffer); |
12883efb SRRH |
2030 | #ifdef CONFIG_TRACER_MAX_TRACE |
2031 | tracing_reset_online_cpus(&tr->max_buffer); | |
2032 | #endif | |
873c642f | 2033 | } |
9456f0fa SR |
2034 | } |
2035 | ||
d914ba37 JF |
2036 | static int *tgid_map; |
2037 | ||
939c7a4f | 2038 | #define SAVED_CMDLINES_DEFAULT 128 |
2c7eea4c | 2039 | #define NO_CMDLINE_MAP UINT_MAX |
edc35bd7 | 2040 | static arch_spinlock_t trace_cmdline_lock = __ARCH_SPIN_LOCK_UNLOCKED; |
939c7a4f YY |
2041 | struct saved_cmdlines_buffer { |
2042 | unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; | |
2043 | unsigned *map_cmdline_to_pid; | |
2044 | unsigned cmdline_num; | |
2045 | int cmdline_idx; | |
2046 | char *saved_cmdlines; | |
2047 | }; | |
2048 | static struct saved_cmdlines_buffer *savedcmd; | |
25b0b44a | 2049 | |
25b0b44a | 2050 | /* temporary disable recording */ |
d914ba37 | 2051 | static atomic_t trace_record_taskinfo_disabled __read_mostly; |
bc0c38d1 | 2052 | |
939c7a4f YY |
2053 | static inline char *get_saved_cmdlines(int idx) |
2054 | { | |
2055 | return &savedcmd->saved_cmdlines[idx * TASK_COMM_LEN]; | |
2056 | } | |
2057 | ||
2058 | static inline void set_cmdline(int idx, const char *cmdline) | |
bc0c38d1 | 2059 | { |
85f726a3 | 2060 | strncpy(get_saved_cmdlines(idx), cmdline, TASK_COMM_LEN); |
939c7a4f YY |
2061 | } |
2062 | ||
2063 | static int allocate_cmdlines_buffer(unsigned int val, | |
2064 | struct saved_cmdlines_buffer *s) | |
2065 | { | |
6da2ec56 KC |
2066 | s->map_cmdline_to_pid = kmalloc_array(val, |
2067 | sizeof(*s->map_cmdline_to_pid), | |
2068 | GFP_KERNEL); | |
939c7a4f YY |
2069 | if (!s->map_cmdline_to_pid) |
2070 | return -ENOMEM; | |
2071 | ||
6da2ec56 | 2072 | s->saved_cmdlines = kmalloc_array(TASK_COMM_LEN, val, GFP_KERNEL); |
939c7a4f YY |
2073 | if (!s->saved_cmdlines) { |
2074 | kfree(s->map_cmdline_to_pid); | |
2075 | return -ENOMEM; | |
2076 | } | |
2077 | ||
2078 | s->cmdline_idx = 0; | |
2079 | s->cmdline_num = val; | |
2080 | memset(&s->map_pid_to_cmdline, NO_CMDLINE_MAP, | |
2081 | sizeof(s->map_pid_to_cmdline)); | |
2082 | memset(s->map_cmdline_to_pid, NO_CMDLINE_MAP, | |
2083 | val * sizeof(*s->map_cmdline_to_pid)); | |
2084 | ||
2085 | return 0; | |
2086 | } | |
2087 | ||
2088 | static int trace_create_savedcmd(void) | |
2089 | { | |
2090 | int ret; | |
2091 | ||
a6af8fbf | 2092 | savedcmd = kmalloc(sizeof(*savedcmd), GFP_KERNEL); |
939c7a4f YY |
2093 | if (!savedcmd) |
2094 | return -ENOMEM; | |
2095 | ||
2096 | ret = allocate_cmdlines_buffer(SAVED_CMDLINES_DEFAULT, savedcmd); | |
2097 | if (ret < 0) { | |
2098 | kfree(savedcmd); | |
2099 | savedcmd = NULL; | |
2100 | return -ENOMEM; | |
2101 | } | |
2102 | ||
2103 | return 0; | |
bc0c38d1 SR |
2104 | } |
2105 | ||
b5130b1e CE |
2106 | int is_tracing_stopped(void) |
2107 | { | |
2b6080f2 | 2108 | return global_trace.stop_count; |
b5130b1e CE |
2109 | } |
2110 | ||
0f048701 SR |
2111 | /** |
2112 | * tracing_start - quick start of the tracer | |
2113 | * | |
2114 | * If tracing is enabled but was stopped by tracing_stop, | |
2115 | * this will start the tracer back up. | |
2116 | */ | |
2117 | void tracing_start(void) | |
2118 | { | |
13292494 | 2119 | struct trace_buffer *buffer; |
0f048701 SR |
2120 | unsigned long flags; |
2121 | ||
2122 | if (tracing_disabled) | |
2123 | return; | |
2124 | ||
2b6080f2 SR |
2125 | raw_spin_lock_irqsave(&global_trace.start_lock, flags); |
2126 | if (--global_trace.stop_count) { | |
2127 | if (global_trace.stop_count < 0) { | |
b06a8301 SR |
2128 | /* Someone screwed up their debugging */ |
2129 | WARN_ON_ONCE(1); | |
2b6080f2 | 2130 | global_trace.stop_count = 0; |
b06a8301 | 2131 | } |
0f048701 SR |
2132 | goto out; |
2133 | } | |
2134 | ||
a2f80714 | 2135 | /* Prevent the buffers from switching */ |
0b9b12c1 | 2136 | arch_spin_lock(&global_trace.max_lock); |
0f048701 | 2137 | |
1c5eb448 | 2138 | buffer = global_trace.array_buffer.buffer; |
0f048701 SR |
2139 | if (buffer) |
2140 | ring_buffer_record_enable(buffer); | |
2141 | ||
12883efb SRRH |
2142 | #ifdef CONFIG_TRACER_MAX_TRACE |
2143 | buffer = global_trace.max_buffer.buffer; | |
0f048701 SR |
2144 | if (buffer) |
2145 | ring_buffer_record_enable(buffer); | |
12883efb | 2146 | #endif |
0f048701 | 2147 | |
0b9b12c1 | 2148 | arch_spin_unlock(&global_trace.max_lock); |
a2f80714 | 2149 | |
0f048701 | 2150 | out: |
2b6080f2 SR |
2151 | raw_spin_unlock_irqrestore(&global_trace.start_lock, flags); |
2152 | } | |
2153 | ||
2154 | static void tracing_start_tr(struct trace_array *tr) | |
2155 | { | |
13292494 | 2156 | struct trace_buffer *buffer; |
2b6080f2 SR |
2157 | unsigned long flags; |
2158 | ||
2159 | if (tracing_disabled) | |
2160 | return; | |
2161 | ||
2162 | /* If global, we need to also start the max tracer */ | |
2163 | if (tr->flags & TRACE_ARRAY_FL_GLOBAL) | |
2164 | return tracing_start(); | |
2165 | ||
2166 | raw_spin_lock_irqsave(&tr->start_lock, flags); | |
2167 | ||
2168 | if (--tr->stop_count) { | |
2169 | if (tr->stop_count < 0) { | |
2170 | /* Someone screwed up their debugging */ | |
2171 | WARN_ON_ONCE(1); | |
2172 | tr->stop_count = 0; | |
2173 | } | |
2174 | goto out; | |
2175 | } | |
2176 | ||
1c5eb448 | 2177 | buffer = tr->array_buffer.buffer; |
2b6080f2 SR |
2178 | if (buffer) |
2179 | ring_buffer_record_enable(buffer); | |
2180 | ||
2181 | out: | |
2182 | raw_spin_unlock_irqrestore(&tr->start_lock, flags); | |
0f048701 SR |
2183 | } |
2184 | ||
2185 | /** | |
2186 | * tracing_stop - quick stop of the tracer | |
2187 | * | |
2188 | * Light weight way to stop tracing. Use in conjunction with | |
2189 | * tracing_start. | |
2190 | */ | |
2191 | void tracing_stop(void) | |
2192 | { | |
13292494 | 2193 | struct trace_buffer *buffer; |
0f048701 SR |
2194 | unsigned long flags; |
2195 | ||
2b6080f2 SR |
2196 | raw_spin_lock_irqsave(&global_trace.start_lock, flags); |
2197 | if (global_trace.stop_count++) | |
0f048701 SR |
2198 | goto out; |
2199 | ||
a2f80714 | 2200 | /* Prevent the buffers from switching */ |
0b9b12c1 | 2201 | arch_spin_lock(&global_trace.max_lock); |
a2f80714 | 2202 | |
1c5eb448 | 2203 | buffer = global_trace.array_buffer.buffer; |
0f048701 SR |
2204 | if (buffer) |
2205 | ring_buffer_record_disable(buffer); | |
2206 | ||
12883efb SRRH |
2207 | #ifdef CONFIG_TRACER_MAX_TRACE |
2208 | buffer = global_trace.max_buffer.buffer; | |
0f048701 SR |
2209 | if (buffer) |
2210 | ring_buffer_record_disable(buffer); | |
12883efb | 2211 | #endif |
0f048701 | 2212 | |
0b9b12c1 | 2213 | arch_spin_unlock(&global_trace.max_lock); |
a2f80714 | 2214 | |
0f048701 | 2215 | out: |
2b6080f2 SR |
2216 | raw_spin_unlock_irqrestore(&global_trace.start_lock, flags); |
2217 | } | |
2218 | ||
2219 | static void tracing_stop_tr(struct trace_array *tr) | |
2220 | { | |
13292494 | 2221 | struct trace_buffer *buffer; |
2b6080f2 SR |
2222 | unsigned long flags; |
2223 | ||
2224 | /* If global, we need to also stop the max tracer */ | |
2225 | if (tr->flags & TRACE_ARRAY_FL_GLOBAL) | |
2226 | return tracing_stop(); | |
2227 | ||
2228 | raw_spin_lock_irqsave(&tr->start_lock, flags); | |
2229 | if (tr->stop_count++) | |
2230 | goto out; | |
2231 | ||
1c5eb448 | 2232 | buffer = tr->array_buffer.buffer; |
2b6080f2 SR |
2233 | if (buffer) |
2234 | ring_buffer_record_disable(buffer); | |
2235 | ||
2236 | out: | |
2237 | raw_spin_unlock_irqrestore(&tr->start_lock, flags); | |
0f048701 SR |
2238 | } |
2239 | ||
379cfdac | 2240 | static int trace_save_cmdline(struct task_struct *tsk) |
bc0c38d1 | 2241 | { |
a635cf04 | 2242 | unsigned pid, idx; |
bc0c38d1 | 2243 | |
eaf260ac JF |
2244 | /* treat recording of idle task as a success */ |
2245 | if (!tsk->pid) | |
2246 | return 1; | |
2247 | ||
2248 | if (unlikely(tsk->pid > PID_MAX_DEFAULT)) | |
379cfdac | 2249 | return 0; |
bc0c38d1 SR |
2250 | |
2251 | /* | |
2252 | * It's not the end of the world if we don't get | |
2253 | * the lock, but we also don't want to spin | |
2254 | * nor do we want to disable interrupts, | |
2255 | * so if we miss here, then better luck next time. | |
2256 | */ | |
0199c4e6 | 2257 | if (!arch_spin_trylock(&trace_cmdline_lock)) |
379cfdac | 2258 | return 0; |
bc0c38d1 | 2259 | |
939c7a4f | 2260 | idx = savedcmd->map_pid_to_cmdline[tsk->pid]; |
2c7eea4c | 2261 | if (idx == NO_CMDLINE_MAP) { |
939c7a4f | 2262 | idx = (savedcmd->cmdline_idx + 1) % savedcmd->cmdline_num; |
bc0c38d1 | 2263 | |
a635cf04 CE |
2264 | /* |
2265 | * Check whether the cmdline buffer at idx has a pid | |
2266 | * mapped. We are going to overwrite that entry so we | |
2267 | * need to clear the map_pid_to_cmdline. Otherwise we | |
2268 | * would read the new comm for the old pid. | |
2269 | */ | |
939c7a4f | 2270 | pid = savedcmd->map_cmdline_to_pid[idx]; |
a635cf04 | 2271 | if (pid != NO_CMDLINE_MAP) |
939c7a4f | 2272 | savedcmd->map_pid_to_cmdline[pid] = NO_CMDLINE_MAP; |
bc0c38d1 | 2273 | |
939c7a4f YY |
2274 | savedcmd->map_cmdline_to_pid[idx] = tsk->pid; |
2275 | savedcmd->map_pid_to_cmdline[tsk->pid] = idx; | |
bc0c38d1 | 2276 | |
939c7a4f | 2277 | savedcmd->cmdline_idx = idx; |
bc0c38d1 SR |
2278 | } |
2279 | ||
939c7a4f | 2280 | set_cmdline(idx, tsk->comm); |
bc0c38d1 | 2281 | |
0199c4e6 | 2282 | arch_spin_unlock(&trace_cmdline_lock); |
379cfdac SRRH |
2283 | |
2284 | return 1; | |
bc0c38d1 SR |
2285 | } |
2286 | ||
4c27e756 | 2287 | static void __trace_find_cmdline(int pid, char comm[]) |
bc0c38d1 | 2288 | { |
bc0c38d1 SR |
2289 | unsigned map; |
2290 | ||
4ca53085 SR |
2291 | if (!pid) { |
2292 | strcpy(comm, "<idle>"); | |
2293 | return; | |
2294 | } | |
bc0c38d1 | 2295 | |
74bf4076 SR |
2296 | if (WARN_ON_ONCE(pid < 0)) { |
2297 | strcpy(comm, "<XXX>"); | |
2298 | return; | |
2299 | } | |
2300 | ||
4ca53085 SR |
2301 | if (pid > PID_MAX_DEFAULT) { |
2302 | strcpy(comm, "<...>"); | |
2303 | return; | |
2304 | } | |
bc0c38d1 | 2305 | |
939c7a4f | 2306 | map = savedcmd->map_pid_to_cmdline[pid]; |
50d88758 | 2307 | if (map != NO_CMDLINE_MAP) |
e09e2867 | 2308 | strlcpy(comm, get_saved_cmdlines(map), TASK_COMM_LEN); |
50d88758 TG |
2309 | else |
2310 | strcpy(comm, "<...>"); | |
4c27e756 SRRH |
2311 | } |
2312 | ||
2313 | void trace_find_cmdline(int pid, char comm[]) | |
2314 | { | |
2315 | preempt_disable(); | |
2316 | arch_spin_lock(&trace_cmdline_lock); | |
2317 | ||
2318 | __trace_find_cmdline(pid, comm); | |
bc0c38d1 | 2319 | |
0199c4e6 | 2320 | arch_spin_unlock(&trace_cmdline_lock); |
5b6045a9 | 2321 | preempt_enable(); |
bc0c38d1 SR |
2322 | } |
2323 | ||
d914ba37 JF |
2324 | int trace_find_tgid(int pid) |
2325 | { | |
2326 | if (unlikely(!tgid_map || !pid || pid > PID_MAX_DEFAULT)) | |
2327 | return 0; | |
2328 | ||
2329 | return tgid_map[pid]; | |
2330 | } | |
2331 | ||
2332 | static int trace_save_tgid(struct task_struct *tsk) | |
2333 | { | |
bd45d34d JF |
2334 | /* treat recording of idle task as a success */ |
2335 | if (!tsk->pid) | |
2336 | return 1; | |
2337 | ||
2338 | if (unlikely(!tgid_map || tsk->pid > PID_MAX_DEFAULT)) | |
d914ba37 JF |
2339 | return 0; |
2340 | ||
2341 | tgid_map[tsk->pid] = tsk->tgid; | |
2342 | return 1; | |
2343 | } | |
2344 | ||
2345 | static bool tracing_record_taskinfo_skip(int flags) | |
2346 | { | |
2347 | if (unlikely(!(flags & (TRACE_RECORD_CMDLINE | TRACE_RECORD_TGID)))) | |
2348 | return true; | |
2349 | if (atomic_read(&trace_record_taskinfo_disabled) || !tracing_is_on()) | |
2350 | return true; | |
2351 | if (!__this_cpu_read(trace_taskinfo_save)) | |
2352 | return true; | |
2353 | return false; | |
2354 | } | |
2355 | ||
2356 | /** | |
2357 | * tracing_record_taskinfo - record the task info of a task | |
2358 | * | |
c68c9ec1 JK |
2359 | * @task: task to record |
2360 | * @flags: TRACE_RECORD_CMDLINE for recording comm | |
2361 | * TRACE_RECORD_TGID for recording tgid | |
d914ba37 JF |
2362 | */ |
2363 | void tracing_record_taskinfo(struct task_struct *task, int flags) | |
2364 | { | |
29b1a8ad JF |
2365 | bool done; |
2366 | ||
d914ba37 JF |
2367 | if (tracing_record_taskinfo_skip(flags)) |
2368 | return; | |
29b1a8ad JF |
2369 | |
2370 | /* | |
2371 | * Record as much task information as possible. If some fail, continue | |
2372 | * to try to record the others. | |
2373 | */ | |
2374 | done = !(flags & TRACE_RECORD_CMDLINE) || trace_save_cmdline(task); | |
2375 | done &= !(flags & TRACE_RECORD_TGID) || trace_save_tgid(task); | |
2376 | ||
2377 | /* If recording any information failed, retry again soon. */ | |
2378 | if (!done) | |
d914ba37 JF |
2379 | return; |
2380 | ||
2381 | __this_cpu_write(trace_taskinfo_save, false); | |
2382 | } | |
2383 | ||
2384 | /** | |
2385 | * tracing_record_taskinfo_sched_switch - record task info for sched_switch | |
2386 | * | |
c68c9ec1 JK |
2387 | * @prev: previous task during sched_switch |
2388 | * @next: next task during sched_switch | |
2389 | * @flags: TRACE_RECORD_CMDLINE for recording comm | |
2390 | * TRACE_RECORD_TGID for recording tgid | |
d914ba37 JF |
2391 | */ |
2392 | void tracing_record_taskinfo_sched_switch(struct task_struct *prev, | |
2393 | struct task_struct *next, int flags) | |
bc0c38d1 | 2394 | { |
29b1a8ad JF |
2395 | bool done; |
2396 | ||
d914ba37 JF |
2397 | if (tracing_record_taskinfo_skip(flags)) |
2398 | return; | |
2399 | ||
29b1a8ad JF |
2400 | /* |
2401 | * Record as much task information as possible. If some fail, continue | |
2402 | * to try to record the others. | |
2403 | */ | |
2404 | done = !(flags & TRACE_RECORD_CMDLINE) || trace_save_cmdline(prev); | |
2405 | done &= !(flags & TRACE_RECORD_CMDLINE) || trace_save_cmdline(next); | |
2406 | done &= !(flags & TRACE_RECORD_TGID) || trace_save_tgid(prev); | |
2407 | done &= !(flags & TRACE_RECORD_TGID) || trace_save_tgid(next); | |
bc0c38d1 | 2408 | |
29b1a8ad JF |
2409 | /* If recording any information failed, retry again soon. */ |
2410 | if (!done) | |
7ffbd48d SR |
2411 | return; |
2412 | ||
d914ba37 JF |
2413 | __this_cpu_write(trace_taskinfo_save, false); |
2414 | } | |
2415 | ||
2416 | /* Helpers to record a specific task information */ | |
2417 | void tracing_record_cmdline(struct task_struct *task) | |
2418 | { | |
2419 | tracing_record_taskinfo(task, TRACE_RECORD_CMDLINE); | |
2420 | } | |
2421 | ||
2422 | void tracing_record_tgid(struct task_struct *task) | |
2423 | { | |
2424 | tracing_record_taskinfo(task, TRACE_RECORD_TGID); | |
bc0c38d1 SR |
2425 | } |
2426 | ||
af0009fc SRV |
2427 | /* |
2428 | * Several functions return TRACE_TYPE_PARTIAL_LINE if the trace_seq | |
2429 | * overflowed, and TRACE_TYPE_HANDLED otherwise. This helper function | |
2430 | * simplifies those functions and keeps them in sync. | |
2431 | */ | |
2432 | enum print_line_t trace_handle_return(struct trace_seq *s) | |
2433 | { | |
2434 | return trace_seq_has_overflowed(s) ? | |
2435 | TRACE_TYPE_PARTIAL_LINE : TRACE_TYPE_HANDLED; | |
2436 | } | |
2437 | EXPORT_SYMBOL_GPL(trace_handle_return); | |
2438 | ||
45dcd8b8 | 2439 | void |
46710f3a CW |
2440 | tracing_generic_entry_update(struct trace_entry *entry, unsigned short type, |
2441 | unsigned long flags, int pc) | |
bc0c38d1 SR |
2442 | { |
2443 | struct task_struct *tsk = current; | |
bc0c38d1 | 2444 | |
777e208d SR |
2445 | entry->preempt_count = pc & 0xff; |
2446 | entry->pid = (tsk) ? tsk->pid : 0; | |
46710f3a | 2447 | entry->type = type; |
777e208d | 2448 | entry->flags = |
9244489a | 2449 | #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT |
2e2ca155 | 2450 | (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
9244489a SR |
2451 | #else |
2452 | TRACE_FLAG_IRQS_NOSUPPORT | | |
2453 | #endif | |
7e6867bf | 2454 | ((pc & NMI_MASK ) ? TRACE_FLAG_NMI : 0) | |
bc0c38d1 | 2455 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
c59f29cb | 2456 | ((pc & SOFTIRQ_OFFSET) ? TRACE_FLAG_SOFTIRQ : 0) | |
e5137b50 PZ |
2457 | (tif_need_resched() ? TRACE_FLAG_NEED_RESCHED : 0) | |
2458 | (test_preempt_need_resched() ? TRACE_FLAG_PREEMPT_RESCHED : 0); | |
bc0c38d1 | 2459 | } |
f413cdb8 | 2460 | EXPORT_SYMBOL_GPL(tracing_generic_entry_update); |
bc0c38d1 | 2461 | |
e77405ad | 2462 | struct ring_buffer_event * |
13292494 | 2463 | trace_buffer_lock_reserve(struct trace_buffer *buffer, |
e77405ad SR |
2464 | int type, |
2465 | unsigned long len, | |
2466 | unsigned long flags, int pc) | |
51a763dd | 2467 | { |
3e9a8aad | 2468 | return __trace_buffer_lock_reserve(buffer, type, len, flags, pc); |
0fc1b09f SRRH |
2469 | } |
2470 | ||
2471 | DEFINE_PER_CPU(struct ring_buffer_event *, trace_buffered_event); | |
2472 | DEFINE_PER_CPU(int, trace_buffered_event_cnt); | |
2473 | static int trace_buffered_event_ref; | |
2474 | ||
2475 | /** | |
2476 | * trace_buffered_event_enable - enable buffering events | |
2477 | * | |
2478 | * When events are being filtered, it is quicker to use a temporary | |
2479 | * buffer to write the event data into if there's a likely chance | |
2480 | * that it will not be committed. The discard of the ring buffer | |
2481 | * is not as fast as committing, and is much slower than copying | |
2482 | * a commit. | |
2483 | * | |
2484 | * When an event is to be filtered, allocate per cpu buffers to | |
2485 | * write the event data into, and if the event is filtered and discarded | |
2486 | * it is simply dropped, otherwise, the entire data is to be committed | |
2487 | * in one shot. | |
2488 | */ | |
2489 | void trace_buffered_event_enable(void) | |
2490 | { | |
2491 | struct ring_buffer_event *event; | |
2492 | struct page *page; | |
2493 | int cpu; | |
51a763dd | 2494 | |
0fc1b09f SRRH |
2495 | WARN_ON_ONCE(!mutex_is_locked(&event_mutex)); |
2496 | ||
2497 | if (trace_buffered_event_ref++) | |
2498 | return; | |
2499 | ||
2500 | for_each_tracing_cpu(cpu) { | |
2501 | page = alloc_pages_node(cpu_to_node(cpu), | |
2502 | GFP_KERNEL | __GFP_NORETRY, 0); | |
2503 | if (!page) | |
2504 | goto failed; | |
2505 | ||
2506 | event = page_address(page); | |
2507 | memset(event, 0, sizeof(*event)); | |
2508 | ||
2509 | per_cpu(trace_buffered_event, cpu) = event; | |
2510 | ||
2511 | preempt_disable(); | |
2512 | if (cpu == smp_processor_id() && | |
2513 | this_cpu_read(trace_buffered_event) != | |
2514 | per_cpu(trace_buffered_event, cpu)) | |
2515 | WARN_ON_ONCE(1); | |
2516 | preempt_enable(); | |
51a763dd ACM |
2517 | } |
2518 | ||
0fc1b09f SRRH |
2519 | return; |
2520 | failed: | |
2521 | trace_buffered_event_disable(); | |
2522 | } | |
2523 | ||
2524 | static void enable_trace_buffered_event(void *data) | |
2525 | { | |
2526 | /* Probably not needed, but do it anyway */ | |
2527 | smp_rmb(); | |
2528 | this_cpu_dec(trace_buffered_event_cnt); | |
2529 | } | |
2530 | ||
2531 | static void disable_trace_buffered_event(void *data) | |
2532 | { | |
2533 | this_cpu_inc(trace_buffered_event_cnt); | |
2534 | } | |
2535 | ||
2536 | /** | |
2537 | * trace_buffered_event_disable - disable buffering events | |
2538 | * | |
2539 | * When a filter is removed, it is faster to not use the buffered | |
2540 | * events, and to commit directly into the ring buffer. Free up | |
2541 | * the temp buffers when there are no more users. This requires | |
2542 | * special synchronization with current events. | |
2543 | */ | |
2544 | void trace_buffered_event_disable(void) | |
2545 | { | |
2546 | int cpu; | |
2547 | ||
2548 | WARN_ON_ONCE(!mutex_is_locked(&event_mutex)); | |
2549 | ||
2550 | if (WARN_ON_ONCE(!trace_buffered_event_ref)) | |
2551 | return; | |
2552 | ||
2553 | if (--trace_buffered_event_ref) | |
2554 | return; | |
2555 | ||
2556 | preempt_disable(); | |
2557 | /* For each CPU, set the buffer as used. */ | |
2558 | smp_call_function_many(tracing_buffer_mask, | |
2559 | disable_trace_buffered_event, NULL, 1); | |
2560 | preempt_enable(); | |
2561 | ||
2562 | /* Wait for all current users to finish */ | |
74401729 | 2563 | synchronize_rcu(); |
0fc1b09f SRRH |
2564 | |
2565 | for_each_tracing_cpu(cpu) { | |
2566 | free_page((unsigned long)per_cpu(trace_buffered_event, cpu)); | |
2567 | per_cpu(trace_buffered_event, cpu) = NULL; | |
2568 | } | |
2569 | /* | |
2570 | * Make sure trace_buffered_event is NULL before clearing | |
2571 | * trace_buffered_event_cnt. | |
2572 | */ | |
2573 | smp_wmb(); | |
2574 | ||
2575 | preempt_disable(); | |
2576 | /* Do the work on each cpu */ | |
2577 | smp_call_function_many(tracing_buffer_mask, | |
2578 | enable_trace_buffered_event, NULL, 1); | |
2579 | preempt_enable(); | |
51a763dd | 2580 | } |
51a763dd | 2581 | |
13292494 | 2582 | static struct trace_buffer *temp_buffer; |
2c4a33ab | 2583 | |
ccb469a1 | 2584 | struct ring_buffer_event * |
13292494 | 2585 | trace_event_buffer_lock_reserve(struct trace_buffer **current_rb, |
7f1d2f82 | 2586 | struct trace_event_file *trace_file, |
ccb469a1 SR |
2587 | int type, unsigned long len, |
2588 | unsigned long flags, int pc) | |
2589 | { | |
2c4a33ab | 2590 | struct ring_buffer_event *entry; |
0fc1b09f | 2591 | int val; |
2c4a33ab | 2592 | |
1c5eb448 | 2593 | *current_rb = trace_file->tr->array_buffer.buffer; |
0fc1b09f | 2594 | |
00b41452 | 2595 | if (!ring_buffer_time_stamp_abs(*current_rb) && (trace_file->flags & |
0fc1b09f SRRH |
2596 | (EVENT_FILE_FL_SOFT_DISABLED | EVENT_FILE_FL_FILTERED)) && |
2597 | (entry = this_cpu_read(trace_buffered_event))) { | |
2598 | /* Try to use the per cpu buffer first */ | |
2599 | val = this_cpu_inc_return(trace_buffered_event_cnt); | |
2600 | if (val == 1) { | |
2601 | trace_event_setup(entry, type, flags, pc); | |
2602 | entry->array[0] = len; | |
2603 | return entry; | |
2604 | } | |
2605 | this_cpu_dec(trace_buffered_event_cnt); | |
2606 | } | |
2607 | ||
3e9a8aad SRRH |
2608 | entry = __trace_buffer_lock_reserve(*current_rb, |
2609 | type, len, flags, pc); | |
2c4a33ab SRRH |
2610 | /* |
2611 | * If tracing is off, but we have triggers enabled | |
2612 | * we still need to look at the event data. Use the temp_buffer | |
2613 | * to store the trace event for the tigger to use. It's recusive | |
2614 | * safe and will not be recorded anywhere. | |
2615 | */ | |
5d6ad960 | 2616 | if (!entry && trace_file->flags & EVENT_FILE_FL_TRIGGER_COND) { |
2c4a33ab | 2617 | *current_rb = temp_buffer; |
3e9a8aad SRRH |
2618 | entry = __trace_buffer_lock_reserve(*current_rb, |
2619 | type, len, flags, pc); | |
2c4a33ab SRRH |
2620 | } |
2621 | return entry; | |
ccb469a1 SR |
2622 | } |
2623 | EXPORT_SYMBOL_GPL(trace_event_buffer_lock_reserve); | |
2624 | ||
42391745 SRRH |
2625 | static DEFINE_SPINLOCK(tracepoint_iter_lock); |
2626 | static DEFINE_MUTEX(tracepoint_printk_mutex); | |
2627 | ||
2628 | static void output_printk(struct trace_event_buffer *fbuffer) | |
2629 | { | |
2630 | struct trace_event_call *event_call; | |
d8d0c245 | 2631 | struct trace_event_file *file; |
42391745 SRRH |
2632 | struct trace_event *event; |
2633 | unsigned long flags; | |
2634 | struct trace_iterator *iter = tracepoint_print_iter; | |
2635 | ||
2636 | /* We should never get here if iter is NULL */ | |
2637 | if (WARN_ON_ONCE(!iter)) | |
2638 | return; | |
2639 | ||
2640 | event_call = fbuffer->trace_file->event_call; | |
2641 | if (!event_call || !event_call->event.funcs || | |
2642 | !event_call->event.funcs->trace) | |
2643 | return; | |
2644 | ||
d8d0c245 MH |
2645 | file = fbuffer->trace_file; |
2646 | if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) || | |
2647 | (unlikely(file->flags & EVENT_FILE_FL_FILTERED) && | |
2648 | !filter_match_preds(file->filter, fbuffer->entry))) | |
2649 | return; | |
2650 | ||
42391745 SRRH |
2651 | event = &fbuffer->trace_file->event_call->event; |
2652 | ||
2653 | spin_lock_irqsave(&tracepoint_iter_lock, flags); | |
2654 | trace_seq_init(&iter->seq); | |
2655 | iter->ent = fbuffer->entry; | |
2656 | event_call->event.funcs->trace(iter, 0, event); | |
2657 | trace_seq_putc(&iter->seq, 0); | |
2658 | printk("%s", iter->seq.buffer); | |
2659 | ||
2660 | spin_unlock_irqrestore(&tracepoint_iter_lock, flags); | |
2661 | } | |
2662 | ||
2663 | int tracepoint_printk_sysctl(struct ctl_table *table, int write, | |
32927393 | 2664 | void *buffer, size_t *lenp, |
42391745 SRRH |
2665 | loff_t *ppos) |
2666 | { | |
2667 | int save_tracepoint_printk; | |
2668 | int ret; | |
2669 | ||
2670 | mutex_lock(&tracepoint_printk_mutex); | |
2671 | save_tracepoint_printk = tracepoint_printk; | |
2672 | ||
2673 | ret = proc_dointvec(table, write, buffer, lenp, ppos); | |
2674 | ||
2675 | /* | |
2676 | * This will force exiting early, as tracepoint_printk | |
2677 | * is always zero when tracepoint_printk_iter is not allocated | |
2678 | */ | |
2679 | if (!tracepoint_print_iter) | |
2680 | tracepoint_printk = 0; | |
2681 | ||
2682 | if (save_tracepoint_printk == tracepoint_printk) | |
2683 | goto out; | |
2684 | ||
2685 | if (tracepoint_printk) | |
2686 | static_key_enable(&tracepoint_printk_key.key); | |
2687 | else | |
2688 | static_key_disable(&tracepoint_printk_key.key); | |
2689 | ||
2690 | out: | |
2691 | mutex_unlock(&tracepoint_printk_mutex); | |
2692 | ||
2693 | return ret; | |
2694 | } | |
2695 | ||
2696 | void trace_event_buffer_commit(struct trace_event_buffer *fbuffer) | |
2697 | { | |
2698 | if (static_key_false(&tracepoint_printk_key.key)) | |
2699 | output_printk(fbuffer); | |
2700 | ||
8cfcf155 | 2701 | event_trigger_unlock_commit_regs(fbuffer->trace_file, fbuffer->buffer, |
42391745 | 2702 | fbuffer->event, fbuffer->entry, |
8cfcf155 | 2703 | fbuffer->flags, fbuffer->pc, fbuffer->regs); |
42391745 SRRH |
2704 | } |
2705 | EXPORT_SYMBOL_GPL(trace_event_buffer_commit); | |
2706 | ||
2ee5b92a SRV |
2707 | /* |
2708 | * Skip 3: | |
2709 | * | |
2710 | * trace_buffer_unlock_commit_regs() | |
2711 | * trace_event_buffer_commit() | |
2712 | * trace_event_raw_event_xxx() | |
13cf912b | 2713 | */ |
2ee5b92a SRV |
2714 | # define STACK_SKIP 3 |
2715 | ||
b7f0c959 | 2716 | void trace_buffer_unlock_commit_regs(struct trace_array *tr, |
13292494 | 2717 | struct trace_buffer *buffer, |
0d5c6e1c SR |
2718 | struct ring_buffer_event *event, |
2719 | unsigned long flags, int pc, | |
2720 | struct pt_regs *regs) | |
1fd8df2c | 2721 | { |
7ffbd48d | 2722 | __buffer_unlock_commit(buffer, event); |
1fd8df2c | 2723 | |
be54f69c | 2724 | /* |
2ee5b92a | 2725 | * If regs is not set, then skip the necessary functions. |
be54f69c SRRH |
2726 | * Note, we can still get here via blktrace, wakeup tracer |
2727 | * and mmiotrace, but that's ok if they lose a function or | |
2ee5b92a | 2728 | * two. They are not that meaningful. |
be54f69c | 2729 | */ |
2ee5b92a | 2730 | ftrace_trace_stack(tr, buffer, flags, regs ? 0 : STACK_SKIP, pc, regs); |
1fd8df2c MH |
2731 | ftrace_trace_userstack(buffer, flags, pc); |
2732 | } | |
1fd8df2c | 2733 | |
52ffabe3 SRRH |
2734 | /* |
2735 | * Similar to trace_buffer_unlock_commit_regs() but do not dump stack. | |
2736 | */ | |
2737 | void | |
13292494 | 2738 | trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer, |
52ffabe3 SRRH |
2739 | struct ring_buffer_event *event) |
2740 | { | |
2741 | __buffer_unlock_commit(buffer, event); | |
2742 | } | |
2743 | ||
478409dd CZ |
2744 | static void |
2745 | trace_process_export(struct trace_export *export, | |
2746 | struct ring_buffer_event *event) | |
2747 | { | |
2748 | struct trace_entry *entry; | |
2749 | unsigned int size = 0; | |
2750 | ||
2751 | entry = ring_buffer_event_data(event); | |
2752 | size = ring_buffer_event_length(event); | |
a773d419 | 2753 | export->write(export, entry, size); |
478409dd CZ |
2754 | } |
2755 | ||
2756 | static DEFINE_MUTEX(ftrace_export_lock); | |
2757 | ||
2758 | static struct trace_export __rcu *ftrace_exports_list __read_mostly; | |
2759 | ||
2760 | static DEFINE_STATIC_KEY_FALSE(ftrace_exports_enabled); | |
2761 | ||
2762 | static inline void ftrace_exports_enable(void) | |
2763 | { | |
2764 | static_branch_enable(&ftrace_exports_enabled); | |
2765 | } | |
2766 | ||
2767 | static inline void ftrace_exports_disable(void) | |
2768 | { | |
2769 | static_branch_disable(&ftrace_exports_enabled); | |
2770 | } | |
2771 | ||
1cce377d | 2772 | static void ftrace_exports(struct ring_buffer_event *event) |
478409dd CZ |
2773 | { |
2774 | struct trace_export *export; | |
2775 | ||
2776 | preempt_disable_notrace(); | |
2777 | ||
0a5b99f5 | 2778 | export = rcu_dereference_raw_check(ftrace_exports_list); |
478409dd CZ |
2779 | while (export) { |
2780 | trace_process_export(export, event); | |
0a5b99f5 | 2781 | export = rcu_dereference_raw_check(export->next); |
478409dd CZ |
2782 | } |
2783 | ||
2784 | preempt_enable_notrace(); | |
2785 | } | |
2786 | ||
2787 | static inline void | |
2788 | add_trace_export(struct trace_export **list, struct trace_export *export) | |
2789 | { | |
2790 | rcu_assign_pointer(export->next, *list); | |
2791 | /* | |
2792 | * We are entering export into the list but another | |
2793 | * CPU might be walking that list. We need to make sure | |
2794 | * the export->next pointer is valid before another CPU sees | |
2795 | * the export pointer included into the list. | |
2796 | */ | |
2797 | rcu_assign_pointer(*list, export); | |
2798 | } | |
2799 | ||
2800 | static inline int | |
2801 | rm_trace_export(struct trace_export **list, struct trace_export *export) | |
2802 | { | |
2803 | struct trace_export **p; | |
2804 | ||
2805 | for (p = list; *p != NULL; p = &(*p)->next) | |
2806 | if (*p == export) | |
2807 | break; | |
2808 | ||
2809 | if (*p != export) | |
2810 | return -1; | |
2811 | ||
2812 | rcu_assign_pointer(*p, (*p)->next); | |
2813 | ||
2814 | return 0; | |
2815 | } | |
2816 | ||
2817 | static inline void | |
2818 | add_ftrace_export(struct trace_export **list, struct trace_export *export) | |
2819 | { | |
2820 | if (*list == NULL) | |
2821 | ftrace_exports_enable(); | |
2822 | ||
2823 | add_trace_export(list, export); | |
2824 | } | |
2825 | ||
2826 | static inline int | |
2827 | rm_ftrace_export(struct trace_export **list, struct trace_export *export) | |
2828 | { | |
2829 | int ret; | |
2830 | ||
2831 | ret = rm_trace_export(list, export); | |
2832 | if (*list == NULL) | |
2833 | ftrace_exports_disable(); | |
2834 | ||
2835 | return ret; | |
2836 | } | |
2837 | ||
2838 | int register_ftrace_export(struct trace_export *export) | |
2839 | { | |
2840 | if (WARN_ON_ONCE(!export->write)) | |
2841 | return -1; | |
2842 | ||
2843 | mutex_lock(&ftrace_export_lock); | |
2844 | ||
2845 | add_ftrace_export(&ftrace_exports_list, export); | |
2846 | ||
2847 | mutex_unlock(&ftrace_export_lock); | |
2848 | ||
2849 | return 0; | |
2850 | } | |
2851 | EXPORT_SYMBOL_GPL(register_ftrace_export); | |
2852 | ||
2853 | int unregister_ftrace_export(struct trace_export *export) | |
2854 | { | |
2855 | int ret; | |
2856 | ||
2857 | mutex_lock(&ftrace_export_lock); | |
2858 | ||
2859 | ret = rm_ftrace_export(&ftrace_exports_list, export); | |
2860 | ||
2861 | mutex_unlock(&ftrace_export_lock); | |
2862 | ||
2863 | return ret; | |
2864 | } | |
2865 | EXPORT_SYMBOL_GPL(unregister_ftrace_export); | |
2866 | ||
e309b41d | 2867 | void |
7be42151 | 2868 | trace_function(struct trace_array *tr, |
38697053 SR |
2869 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
2870 | int pc) | |
bc0c38d1 | 2871 | { |
2425bcb9 | 2872 | struct trace_event_call *call = &event_function; |
13292494 | 2873 | struct trace_buffer *buffer = tr->array_buffer.buffer; |
3928a8a2 | 2874 | struct ring_buffer_event *event; |
777e208d | 2875 | struct ftrace_entry *entry; |
bc0c38d1 | 2876 | |
3e9a8aad SRRH |
2877 | event = __trace_buffer_lock_reserve(buffer, TRACE_FN, sizeof(*entry), |
2878 | flags, pc); | |
3928a8a2 SR |
2879 | if (!event) |
2880 | return; | |
2881 | entry = ring_buffer_event_data(event); | |
777e208d SR |
2882 | entry->ip = ip; |
2883 | entry->parent_ip = parent_ip; | |
e1112b4d | 2884 | |
478409dd CZ |
2885 | if (!call_filter_check_discard(call, entry, buffer, event)) { |
2886 | if (static_branch_unlikely(&ftrace_exports_enabled)) | |
2887 | ftrace_exports(event); | |
7ffbd48d | 2888 | __buffer_unlock_commit(buffer, event); |
478409dd | 2889 | } |
bc0c38d1 SR |
2890 | } |
2891 | ||
c0a0d0d3 | 2892 | #ifdef CONFIG_STACKTRACE |
4a9bd3f1 | 2893 | |
2a820bf7 TG |
2894 | /* Allow 4 levels of nesting: normal, softirq, irq, NMI */ |
2895 | #define FTRACE_KSTACK_NESTING 4 | |
2896 | ||
2897 | #define FTRACE_KSTACK_ENTRIES (PAGE_SIZE / FTRACE_KSTACK_NESTING) | |
2898 | ||
4a9bd3f1 | 2899 | struct ftrace_stack { |
2a820bf7 | 2900 | unsigned long calls[FTRACE_KSTACK_ENTRIES]; |
4a9bd3f1 SR |
2901 | }; |
2902 | ||
2a820bf7 TG |
2903 | |
2904 | struct ftrace_stacks { | |
2905 | struct ftrace_stack stacks[FTRACE_KSTACK_NESTING]; | |
4a9bd3f1 SR |
2906 | }; |
2907 | ||
2a820bf7 | 2908 | static DEFINE_PER_CPU(struct ftrace_stacks, ftrace_stacks); |
4a9bd3f1 SR |
2909 | static DEFINE_PER_CPU(int, ftrace_stack_reserve); |
2910 | ||
13292494 | 2911 | static void __ftrace_trace_stack(struct trace_buffer *buffer, |
53614991 | 2912 | unsigned long flags, |
1fd8df2c | 2913 | int skip, int pc, struct pt_regs *regs) |
86387f7e | 2914 | { |
2425bcb9 | 2915 | struct trace_event_call *call = &event_kernel_stack; |
3928a8a2 | 2916 | struct ring_buffer_event *event; |
ee6dd0db | 2917 | unsigned int size, nr_entries; |
2a820bf7 | 2918 | struct ftrace_stack *fstack; |
777e208d | 2919 | struct stack_entry *entry; |
2a820bf7 | 2920 | int stackidx; |
4a9bd3f1 | 2921 | |
be54f69c | 2922 | /* |
2ee5b92a | 2923 | * Add one, for this function and the call to save_stack_trace() |
be54f69c SRRH |
2924 | * If regs is set, then these functions will not be in the way. |
2925 | */ | |
2ee5b92a | 2926 | #ifndef CONFIG_UNWINDER_ORC |
be54f69c | 2927 | if (!regs) |
ee6dd0db | 2928 | skip++; |
2ee5b92a | 2929 | #endif |
be54f69c | 2930 | |
4a9bd3f1 SR |
2931 | /* |
2932 | * Since events can happen in NMIs there's no safe way to | |
2933 | * use the per cpu ftrace_stacks. We reserve it and if an interrupt | |
2934 | * or NMI comes in, it will just have to use the default | |
2935 | * FTRACE_STACK_SIZE. | |
2936 | */ | |
2937 | preempt_disable_notrace(); | |
2938 | ||
2a820bf7 TG |
2939 | stackidx = __this_cpu_inc_return(ftrace_stack_reserve) - 1; |
2940 | ||
2941 | /* This should never happen. If it does, yell once and skip */ | |
2942 | if (WARN_ON_ONCE(stackidx > FTRACE_KSTACK_NESTING)) | |
2943 | goto out; | |
2944 | ||
4a9bd3f1 | 2945 | /* |
2a820bf7 TG |
2946 | * The above __this_cpu_inc_return() is 'atomic' cpu local. An |
2947 | * interrupt will either see the value pre increment or post | |
2948 | * increment. If the interrupt happens pre increment it will have | |
2949 | * restored the counter when it returns. We just need a barrier to | |
2950 | * keep gcc from moving things around. | |
4a9bd3f1 SR |
2951 | */ |
2952 | barrier(); | |
4a9bd3f1 | 2953 | |
2a820bf7 | 2954 | fstack = this_cpu_ptr(ftrace_stacks.stacks) + stackidx; |
ee6dd0db | 2955 | size = ARRAY_SIZE(fstack->calls); |
4a9bd3f1 | 2956 | |
ee6dd0db TG |
2957 | if (regs) { |
2958 | nr_entries = stack_trace_save_regs(regs, fstack->calls, | |
2959 | size, skip); | |
2960 | } else { | |
2961 | nr_entries = stack_trace_save(fstack->calls, size, skip); | |
2962 | } | |
86387f7e | 2963 | |
ee6dd0db | 2964 | size = nr_entries * sizeof(unsigned long); |
3e9a8aad SRRH |
2965 | event = __trace_buffer_lock_reserve(buffer, TRACE_STACK, |
2966 | sizeof(*entry) + size, flags, pc); | |
3928a8a2 | 2967 | if (!event) |
4a9bd3f1 SR |
2968 | goto out; |
2969 | entry = ring_buffer_event_data(event); | |
86387f7e | 2970 | |
ee6dd0db TG |
2971 | memcpy(&entry->caller, fstack->calls, size); |
2972 | entry->size = nr_entries; | |
86387f7e | 2973 | |
f306cc82 | 2974 | if (!call_filter_check_discard(call, entry, buffer, event)) |
7ffbd48d | 2975 | __buffer_unlock_commit(buffer, event); |
4a9bd3f1 SR |
2976 | |
2977 | out: | |
2978 | /* Again, don't let gcc optimize things here */ | |
2979 | barrier(); | |
82146529 | 2980 | __this_cpu_dec(ftrace_stack_reserve); |
4a9bd3f1 SR |
2981 | preempt_enable_notrace(); |
2982 | ||
f0a920d5 IM |
2983 | } |
2984 | ||
2d34f489 | 2985 | static inline void ftrace_trace_stack(struct trace_array *tr, |
13292494 | 2986 | struct trace_buffer *buffer, |
73dddbb5 SRRH |
2987 | unsigned long flags, |
2988 | int skip, int pc, struct pt_regs *regs) | |
53614991 | 2989 | { |
2d34f489 | 2990 | if (!(tr->trace_flags & TRACE_ITER_STACKTRACE)) |
53614991 SR |
2991 | return; |
2992 | ||
73dddbb5 | 2993 | __ftrace_trace_stack(buffer, flags, skip, pc, regs); |
53614991 SR |
2994 | } |
2995 | ||
c0a0d0d3 FW |
2996 | void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, |
2997 | int pc) | |
38697053 | 2998 | { |
13292494 | 2999 | struct trace_buffer *buffer = tr->array_buffer.buffer; |
a33d7d94 SRV |
3000 | |
3001 | if (rcu_is_watching()) { | |
3002 | __ftrace_trace_stack(buffer, flags, skip, pc, NULL); | |
3003 | return; | |
3004 | } | |
3005 | ||
3006 | /* | |
3007 | * When an NMI triggers, RCU is enabled via rcu_nmi_enter(), | |
3008 | * but if the above rcu_is_watching() failed, then the NMI | |
3009 | * triggered someplace critical, and rcu_irq_enter() should | |
3010 | * not be called from NMI. | |
3011 | */ | |
3012 | if (unlikely(in_nmi())) | |
3013 | return; | |
3014 | ||
a33d7d94 SRV |
3015 | rcu_irq_enter_irqson(); |
3016 | __ftrace_trace_stack(buffer, flags, skip, pc, NULL); | |
3017 | rcu_irq_exit_irqson(); | |
38697053 SR |
3018 | } |
3019 | ||
03889384 SR |
3020 | /** |
3021 | * trace_dump_stack - record a stack back trace in the trace buffer | |
c142be8e | 3022 | * @skip: Number of functions to skip (helper handlers) |
03889384 | 3023 | */ |
c142be8e | 3024 | void trace_dump_stack(int skip) |
03889384 SR |
3025 | { |
3026 | unsigned long flags; | |
3027 | ||
3028 | if (tracing_disabled || tracing_selftest_running) | |
e36c5458 | 3029 | return; |
03889384 SR |
3030 | |
3031 | local_save_flags(flags); | |
3032 | ||
2ee5b92a SRV |
3033 | #ifndef CONFIG_UNWINDER_ORC |
3034 | /* Skip 1 to skip this function. */ | |
3035 | skip++; | |
3036 | #endif | |
1c5eb448 | 3037 | __ftrace_trace_stack(global_trace.array_buffer.buffer, |
c142be8e | 3038 | flags, skip, preempt_count(), NULL); |
03889384 | 3039 | } |
da387e5c | 3040 | EXPORT_SYMBOL_GPL(trace_dump_stack); |
03889384 | 3041 | |
c438f140 | 3042 | #ifdef CONFIG_USER_STACKTRACE_SUPPORT |
91e86e56 SR |
3043 | static DEFINE_PER_CPU(int, user_stack_count); |
3044 | ||
c438f140 | 3045 | static void |
13292494 | 3046 | ftrace_trace_userstack(struct trace_buffer *buffer, unsigned long flags, int pc) |
02b67518 | 3047 | { |
2425bcb9 | 3048 | struct trace_event_call *call = &event_user_stack; |
8d7c6a96 | 3049 | struct ring_buffer_event *event; |
02b67518 | 3050 | struct userstack_entry *entry; |
02b67518 | 3051 | |
983f938a | 3052 | if (!(global_trace.trace_flags & TRACE_ITER_USERSTACKTRACE)) |
02b67518 TE |
3053 | return; |
3054 | ||
b6345879 SR |
3055 | /* |
3056 | * NMIs can not handle page faults, even with fix ups. | |
3057 | * The save user stack can (and often does) fault. | |
3058 | */ | |
3059 | if (unlikely(in_nmi())) | |
3060 | return; | |
02b67518 | 3061 | |
91e86e56 SR |
3062 | /* |
3063 | * prevent recursion, since the user stack tracing may | |
3064 | * trigger other kernel events. | |
3065 | */ | |
3066 | preempt_disable(); | |
3067 | if (__this_cpu_read(user_stack_count)) | |
3068 | goto out; | |
3069 | ||
3070 | __this_cpu_inc(user_stack_count); | |
3071 | ||
3e9a8aad SRRH |
3072 | event = __trace_buffer_lock_reserve(buffer, TRACE_USER_STACK, |
3073 | sizeof(*entry), flags, pc); | |
02b67518 | 3074 | if (!event) |
1dbd1951 | 3075 | goto out_drop_count; |
02b67518 | 3076 | entry = ring_buffer_event_data(event); |
02b67518 | 3077 | |
48659d31 | 3078 | entry->tgid = current->tgid; |
02b67518 TE |
3079 | memset(&entry->caller, 0, sizeof(entry->caller)); |
3080 | ||
ee6dd0db | 3081 | stack_trace_save_user(entry->caller, FTRACE_STACK_ENTRIES); |
f306cc82 | 3082 | if (!call_filter_check_discard(call, entry, buffer, event)) |
7ffbd48d | 3083 | __buffer_unlock_commit(buffer, event); |
91e86e56 | 3084 | |
1dbd1951 | 3085 | out_drop_count: |
91e86e56 | 3086 | __this_cpu_dec(user_stack_count); |
91e86e56 SR |
3087 | out: |
3088 | preempt_enable(); | |
02b67518 | 3089 | } |
c438f140 | 3090 | #else /* CONFIG_USER_STACKTRACE_SUPPORT */ |
13292494 | 3091 | static void ftrace_trace_userstack(struct trace_buffer *buffer, |
c438f140 | 3092 | unsigned long flags, int pc) |
02b67518 | 3093 | { |
02b67518 | 3094 | } |
c438f140 | 3095 | #endif /* !CONFIG_USER_STACKTRACE_SUPPORT */ |
02b67518 | 3096 | |
c0a0d0d3 FW |
3097 | #endif /* CONFIG_STACKTRACE */ |
3098 | ||
07d777fe SR |
3099 | /* created for use with alloc_percpu */ |
3100 | struct trace_buffer_struct { | |
e2ace001 AL |
3101 | int nesting; |
3102 | char buffer[4][TRACE_BUF_SIZE]; | |
07d777fe SR |
3103 | }; |
3104 | ||
3105 | static struct trace_buffer_struct *trace_percpu_buffer; | |
07d777fe SR |
3106 | |
3107 | /* | |
e2ace001 AL |
3108 | * Thise allows for lockless recording. If we're nested too deeply, then |
3109 | * this returns NULL. | |
07d777fe SR |
3110 | */ |
3111 | static char *get_trace_buf(void) | |
3112 | { | |
e2ace001 | 3113 | struct trace_buffer_struct *buffer = this_cpu_ptr(trace_percpu_buffer); |
07d777fe | 3114 | |
e2ace001 | 3115 | if (!buffer || buffer->nesting >= 4) |
07d777fe SR |
3116 | return NULL; |
3117 | ||
3d9622c1 SRV |
3118 | buffer->nesting++; |
3119 | ||
3120 | /* Interrupts must see nesting incremented before we use the buffer */ | |
3121 | barrier(); | |
3122 | return &buffer->buffer[buffer->nesting][0]; | |
e2ace001 AL |
3123 | } |
3124 | ||
3125 | static void put_trace_buf(void) | |
3126 | { | |
3d9622c1 SRV |
3127 | /* Don't let the decrement of nesting leak before this */ |
3128 | barrier(); | |
e2ace001 | 3129 | this_cpu_dec(trace_percpu_buffer->nesting); |
07d777fe SR |
3130 | } |
3131 | ||
3132 | static int alloc_percpu_trace_buffer(void) | |
3133 | { | |
3134 | struct trace_buffer_struct *buffers; | |
07d777fe SR |
3135 | |
3136 | buffers = alloc_percpu(struct trace_buffer_struct); | |
24589e3a | 3137 | if (MEM_FAIL(!buffers, "Could not allocate percpu trace_printk buffer")) |
e2ace001 | 3138 | return -ENOMEM; |
07d777fe SR |
3139 | |
3140 | trace_percpu_buffer = buffers; | |
07d777fe | 3141 | return 0; |
07d777fe SR |
3142 | } |
3143 | ||
81698831 SR |
3144 | static int buffers_allocated; |
3145 | ||
07d777fe SR |
3146 | void trace_printk_init_buffers(void) |
3147 | { | |
07d777fe SR |
3148 | if (buffers_allocated) |
3149 | return; | |
3150 | ||
3151 | if (alloc_percpu_trace_buffer()) | |
3152 | return; | |
3153 | ||
2184db46 SR |
3154 | /* trace_printk() is for debug use only. Don't use it in production. */ |
3155 | ||
a395d6a7 JP |
3156 | pr_warn("\n"); |
3157 | pr_warn("**********************************************************\n"); | |
3158 | pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n"); | |
3159 | pr_warn("** **\n"); | |
3160 | pr_warn("** trace_printk() being used. Allocating extra memory. **\n"); | |
3161 | pr_warn("** **\n"); | |
3162 | pr_warn("** This means that this is a DEBUG kernel and it is **\n"); | |
3163 | pr_warn("** unsafe for production use. **\n"); | |
3164 | pr_warn("** **\n"); | |
3165 | pr_warn("** If you see this message and you are not debugging **\n"); | |
3166 | pr_warn("** the kernel, report this immediately to your vendor! **\n"); | |
3167 | pr_warn("** **\n"); | |
3168 | pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n"); | |
3169 | pr_warn("**********************************************************\n"); | |
07d777fe | 3170 | |
b382ede6 SR |
3171 | /* Expand the buffers to set size */ |
3172 | tracing_update_buffers(); | |
3173 | ||
07d777fe | 3174 | buffers_allocated = 1; |
81698831 SR |
3175 | |
3176 | /* | |
3177 | * trace_printk_init_buffers() can be called by modules. | |
3178 | * If that happens, then we need to start cmdline recording | |
3179 | * directly here. If the global_trace.buffer is already | |
3180 | * allocated here, then this was called by module code. | |
3181 | */ | |
1c5eb448 | 3182 | if (global_trace.array_buffer.buffer) |
81698831 SR |
3183 | tracing_start_cmdline_record(); |
3184 | } | |
f45d1225 | 3185 | EXPORT_SYMBOL_GPL(trace_printk_init_buffers); |
81698831 SR |
3186 | |
3187 | void trace_printk_start_comm(void) | |
3188 | { | |
3189 | /* Start tracing comms if trace printk is set */ | |
3190 | if (!buffers_allocated) | |
3191 | return; | |
3192 | tracing_start_cmdline_record(); | |
3193 | } | |
3194 | ||
3195 | static void trace_printk_start_stop_comm(int enabled) | |
3196 | { | |
3197 | if (!buffers_allocated) | |
3198 | return; | |
3199 | ||
3200 | if (enabled) | |
3201 | tracing_start_cmdline_record(); | |
3202 | else | |
3203 | tracing_stop_cmdline_record(); | |
07d777fe SR |
3204 | } |
3205 | ||
769b0441 | 3206 | /** |
48ead020 | 3207 | * trace_vbprintk - write binary msg to tracing buffer |
c68c9ec1 JK |
3208 | * @ip: The address of the caller |
3209 | * @fmt: The string format to write to the buffer | |
3210 | * @args: Arguments for @fmt | |
769b0441 | 3211 | */ |
40ce74f1 | 3212 | int trace_vbprintk(unsigned long ip, const char *fmt, va_list args) |
769b0441 | 3213 | { |
2425bcb9 | 3214 | struct trace_event_call *call = &event_bprint; |
769b0441 | 3215 | struct ring_buffer_event *event; |
13292494 | 3216 | struct trace_buffer *buffer; |
769b0441 | 3217 | struct trace_array *tr = &global_trace; |
48ead020 | 3218 | struct bprint_entry *entry; |
769b0441 | 3219 | unsigned long flags; |
07d777fe SR |
3220 | char *tbuffer; |
3221 | int len = 0, size, pc; | |
769b0441 FW |
3222 | |
3223 | if (unlikely(tracing_selftest_running || tracing_disabled)) | |
3224 | return 0; | |
3225 | ||
3226 | /* Don't pollute graph traces with trace_vprintk internals */ | |
3227 | pause_graph_tracing(); | |
3228 | ||
3229 | pc = preempt_count(); | |
5168ae50 | 3230 | preempt_disable_notrace(); |
769b0441 | 3231 | |
07d777fe SR |
3232 | tbuffer = get_trace_buf(); |
3233 | if (!tbuffer) { | |
3234 | len = 0; | |
e2ace001 | 3235 | goto out_nobuffer; |
07d777fe | 3236 | } |
769b0441 | 3237 | |
07d777fe | 3238 | len = vbin_printf((u32 *)tbuffer, TRACE_BUF_SIZE/sizeof(int), fmt, args); |
769b0441 | 3239 | |
07d777fe | 3240 | if (len > TRACE_BUF_SIZE/sizeof(int) || len < 0) |
34423f25 | 3241 | goto out_put; |
769b0441 | 3242 | |
07d777fe | 3243 | local_save_flags(flags); |
769b0441 | 3244 | size = sizeof(*entry) + sizeof(u32) * len; |
1c5eb448 | 3245 | buffer = tr->array_buffer.buffer; |
82d1b815 | 3246 | ring_buffer_nest_start(buffer); |
3e9a8aad SRRH |
3247 | event = __trace_buffer_lock_reserve(buffer, TRACE_BPRINT, size, |
3248 | flags, pc); | |
769b0441 | 3249 | if (!event) |
07d777fe | 3250 | goto out; |
769b0441 FW |
3251 | entry = ring_buffer_event_data(event); |
3252 | entry->ip = ip; | |
769b0441 FW |
3253 | entry->fmt = fmt; |
3254 | ||
07d777fe | 3255 | memcpy(entry->buf, tbuffer, sizeof(u32) * len); |
f306cc82 | 3256 | if (!call_filter_check_discard(call, entry, buffer, event)) { |
7ffbd48d | 3257 | __buffer_unlock_commit(buffer, event); |
2d34f489 | 3258 | ftrace_trace_stack(tr, buffer, flags, 6, pc, NULL); |
d931369b | 3259 | } |
769b0441 | 3260 | |
769b0441 | 3261 | out: |
82d1b815 | 3262 | ring_buffer_nest_end(buffer); |
34423f25 | 3263 | out_put: |
e2ace001 AL |
3264 | put_trace_buf(); |
3265 | ||
3266 | out_nobuffer: | |
5168ae50 | 3267 | preempt_enable_notrace(); |
769b0441 FW |
3268 | unpause_graph_tracing(); |
3269 | ||
3270 | return len; | |
3271 | } | |
48ead020 FW |
3272 | EXPORT_SYMBOL_GPL(trace_vbprintk); |
3273 | ||
26b68dd2 | 3274 | __printf(3, 0) |
12883efb | 3275 | static int |
13292494 | 3276 | __trace_array_vprintk(struct trace_buffer *buffer, |
12883efb | 3277 | unsigned long ip, const char *fmt, va_list args) |
48ead020 | 3278 | { |
2425bcb9 | 3279 | struct trace_event_call *call = &event_print; |
48ead020 | 3280 | struct ring_buffer_event *event; |
07d777fe | 3281 | int len = 0, size, pc; |
48ead020 | 3282 | struct print_entry *entry; |
07d777fe SR |
3283 | unsigned long flags; |
3284 | char *tbuffer; | |
48ead020 FW |
3285 | |
3286 | if (tracing_disabled || tracing_selftest_running) | |
3287 | return 0; | |
3288 | ||
07d777fe SR |
3289 | /* Don't pollute graph traces with trace_vprintk internals */ |
3290 | pause_graph_tracing(); | |
3291 | ||
48ead020 FW |
3292 | pc = preempt_count(); |
3293 | preempt_disable_notrace(); | |
48ead020 | 3294 | |
07d777fe SR |
3295 | |
3296 | tbuffer = get_trace_buf(); | |
3297 | if (!tbuffer) { | |
3298 | len = 0; | |
e2ace001 | 3299 | goto out_nobuffer; |
07d777fe | 3300 | } |
48ead020 | 3301 | |
3558a5ac | 3302 | len = vscnprintf(tbuffer, TRACE_BUF_SIZE, fmt, args); |
48ead020 | 3303 | |
07d777fe | 3304 | local_save_flags(flags); |
48ead020 | 3305 | size = sizeof(*entry) + len + 1; |
82d1b815 | 3306 | ring_buffer_nest_start(buffer); |
3e9a8aad SRRH |
3307 | event = __trace_buffer_lock_reserve(buffer, TRACE_PRINT, size, |
3308 | flags, pc); | |
48ead020 | 3309 | if (!event) |
07d777fe | 3310 | goto out; |
48ead020 | 3311 | entry = ring_buffer_event_data(event); |
c13d2f7c | 3312 | entry->ip = ip; |
48ead020 | 3313 | |
3558a5ac | 3314 | memcpy(&entry->buf, tbuffer, len + 1); |
f306cc82 | 3315 | if (!call_filter_check_discard(call, entry, buffer, event)) { |
7ffbd48d | 3316 | __buffer_unlock_commit(buffer, event); |
2d34f489 | 3317 | ftrace_trace_stack(&global_trace, buffer, flags, 6, pc, NULL); |
d931369b | 3318 | } |
e2ace001 AL |
3319 | |
3320 | out: | |
82d1b815 | 3321 | ring_buffer_nest_end(buffer); |
e2ace001 AL |
3322 | put_trace_buf(); |
3323 | ||
3324 | out_nobuffer: | |
48ead020 | 3325 | preempt_enable_notrace(); |
07d777fe | 3326 | unpause_graph_tracing(); |
48ead020 FW |
3327 | |
3328 | return len; | |
3329 | } | |
659372d3 | 3330 | |
26b68dd2 | 3331 | __printf(3, 0) |
12883efb SRRH |
3332 | int trace_array_vprintk(struct trace_array *tr, |
3333 | unsigned long ip, const char *fmt, va_list args) | |
3334 | { | |
1c5eb448 | 3335 | return __trace_array_vprintk(tr->array_buffer.buffer, ip, fmt, args); |
12883efb SRRH |
3336 | } |
3337 | ||
26b68dd2 | 3338 | __printf(3, 0) |
12883efb SRRH |
3339 | int trace_array_printk(struct trace_array *tr, |
3340 | unsigned long ip, const char *fmt, ...) | |
3341 | { | |
3342 | int ret; | |
3343 | va_list ap; | |
3344 | ||
983f938a | 3345 | if (!(global_trace.trace_flags & TRACE_ITER_PRINTK)) |
12883efb SRRH |
3346 | return 0; |
3347 | ||
953ae45a DI |
3348 | if (!tr) |
3349 | return -ENOENT; | |
3350 | ||
12883efb SRRH |
3351 | va_start(ap, fmt); |
3352 | ret = trace_array_vprintk(tr, ip, fmt, ap); | |
3353 | va_end(ap); | |
3354 | return ret; | |
3355 | } | |
f45d1225 | 3356 | EXPORT_SYMBOL_GPL(trace_array_printk); |
12883efb | 3357 | |
26b68dd2 | 3358 | __printf(3, 4) |
13292494 | 3359 | int trace_array_printk_buf(struct trace_buffer *buffer, |
12883efb SRRH |
3360 | unsigned long ip, const char *fmt, ...) |
3361 | { | |
3362 | int ret; | |
3363 | va_list ap; | |
3364 | ||
983f938a | 3365 | if (!(global_trace.trace_flags & TRACE_ITER_PRINTK)) |
12883efb SRRH |
3366 | return 0; |
3367 | ||
3368 | va_start(ap, fmt); | |
3369 | ret = __trace_array_vprintk(buffer, ip, fmt, ap); | |
3370 | va_end(ap); | |
3371 | return ret; | |
3372 | } | |
3373 | ||
26b68dd2 | 3374 | __printf(2, 0) |
659372d3 SR |
3375 | int trace_vprintk(unsigned long ip, const char *fmt, va_list args) |
3376 | { | |
a813a159 | 3377 | return trace_array_vprintk(&global_trace, ip, fmt, args); |
659372d3 | 3378 | } |
769b0441 FW |
3379 | EXPORT_SYMBOL_GPL(trace_vprintk); |
3380 | ||
e2ac8ef5 | 3381 | static void trace_iterator_increment(struct trace_iterator *iter) |
5a90f577 | 3382 | { |
6d158a81 SR |
3383 | struct ring_buffer_iter *buf_iter = trace_buffer_iter(iter, iter->cpu); |
3384 | ||
5a90f577 | 3385 | iter->idx++; |
6d158a81 | 3386 | if (buf_iter) |
bc1a72af | 3387 | ring_buffer_iter_advance(buf_iter); |
5a90f577 SR |
3388 | } |
3389 | ||
e309b41d | 3390 | static struct trace_entry * |
bc21b478 SR |
3391 | peek_next_entry(struct trace_iterator *iter, int cpu, u64 *ts, |
3392 | unsigned long *lost_events) | |
dd0e545f | 3393 | { |
3928a8a2 | 3394 | struct ring_buffer_event *event; |
6d158a81 | 3395 | struct ring_buffer_iter *buf_iter = trace_buffer_iter(iter, cpu); |
dd0e545f | 3396 | |
c9b7a4a7 | 3397 | if (buf_iter) { |
d769041f | 3398 | event = ring_buffer_iter_peek(buf_iter, ts); |
c9b7a4a7 SRV |
3399 | if (lost_events) |
3400 | *lost_events = ring_buffer_iter_dropped(buf_iter) ? | |
3401 | (unsigned long)-1 : 0; | |
3402 | } else { | |
1c5eb448 | 3403 | event = ring_buffer_peek(iter->array_buffer->buffer, cpu, ts, |
bc21b478 | 3404 | lost_events); |
c9b7a4a7 | 3405 | } |
d769041f | 3406 | |
4a9bd3f1 SR |
3407 | if (event) { |
3408 | iter->ent_size = ring_buffer_event_length(event); | |
3409 | return ring_buffer_event_data(event); | |
3410 | } | |
3411 | iter->ent_size = 0; | |
3412 | return NULL; | |
dd0e545f | 3413 | } |
d769041f | 3414 | |
dd0e545f | 3415 | static struct trace_entry * |
bc21b478 SR |
3416 | __find_next_entry(struct trace_iterator *iter, int *ent_cpu, |
3417 | unsigned long *missing_events, u64 *ent_ts) | |
bc0c38d1 | 3418 | { |
13292494 | 3419 | struct trace_buffer *buffer = iter->array_buffer->buffer; |
bc0c38d1 | 3420 | struct trace_entry *ent, *next = NULL; |
aa27497c | 3421 | unsigned long lost_events = 0, next_lost = 0; |
b04cc6b1 | 3422 | int cpu_file = iter->cpu_file; |
3928a8a2 | 3423 | u64 next_ts = 0, ts; |
bc0c38d1 | 3424 | int next_cpu = -1; |
12b5da34 | 3425 | int next_size = 0; |
bc0c38d1 SR |
3426 | int cpu; |
3427 | ||
b04cc6b1 FW |
3428 | /* |
3429 | * If we are in a per_cpu trace file, don't bother by iterating over | |
3430 | * all cpu and peek directly. | |
3431 | */ | |
ae3b5093 | 3432 | if (cpu_file > RING_BUFFER_ALL_CPUS) { |
b04cc6b1 FW |
3433 | if (ring_buffer_empty_cpu(buffer, cpu_file)) |
3434 | return NULL; | |
bc21b478 | 3435 | ent = peek_next_entry(iter, cpu_file, ent_ts, missing_events); |
b04cc6b1 FW |
3436 | if (ent_cpu) |
3437 | *ent_cpu = cpu_file; | |
3438 | ||
3439 | return ent; | |
3440 | } | |
3441 | ||
ab46428c | 3442 | for_each_tracing_cpu(cpu) { |
dd0e545f | 3443 | |
3928a8a2 SR |
3444 | if (ring_buffer_empty_cpu(buffer, cpu)) |
3445 | continue; | |
dd0e545f | 3446 | |
bc21b478 | 3447 | ent = peek_next_entry(iter, cpu, &ts, &lost_events); |
dd0e545f | 3448 | |
cdd31cd2 IM |
3449 | /* |
3450 | * Pick the entry with the smallest timestamp: | |
3451 | */ | |
3928a8a2 | 3452 | if (ent && (!next || ts < next_ts)) { |
bc0c38d1 SR |
3453 | next = ent; |
3454 | next_cpu = cpu; | |
3928a8a2 | 3455 | next_ts = ts; |
bc21b478 | 3456 | next_lost = lost_events; |
12b5da34 | 3457 | next_size = iter->ent_size; |
bc0c38d1 SR |
3458 | } |
3459 | } | |
3460 | ||
12b5da34 SR |
3461 | iter->ent_size = next_size; |
3462 | ||
bc0c38d1 SR |
3463 | if (ent_cpu) |
3464 | *ent_cpu = next_cpu; | |
3465 | ||
3928a8a2 SR |
3466 | if (ent_ts) |
3467 | *ent_ts = next_ts; | |
3468 | ||
bc21b478 SR |
3469 | if (missing_events) |
3470 | *missing_events = next_lost; | |
3471 | ||
bc0c38d1 SR |
3472 | return next; |
3473 | } | |
3474 | ||
8e99cf91 SRV |
3475 | #define STATIC_TEMP_BUF_SIZE 128 |
3476 | static char static_temp_buf[STATIC_TEMP_BUF_SIZE]; | |
3477 | ||
dd0e545f | 3478 | /* Find the next real entry, without updating the iterator itself */ |
c4a8e8be FW |
3479 | struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, |
3480 | int *ent_cpu, u64 *ent_ts) | |
bc0c38d1 | 3481 | { |
ff895103 SRV |
3482 | /* __find_next_entry will reset ent_size */ |
3483 | int ent_size = iter->ent_size; | |
3484 | struct trace_entry *entry; | |
3485 | ||
8e99cf91 SRV |
3486 | /* |
3487 | * If called from ftrace_dump(), then the iter->temp buffer | |
3488 | * will be the static_temp_buf and not created from kmalloc. | |
3489 | * If the entry size is greater than the buffer, we can | |
3490 | * not save it. Just return NULL in that case. This is only | |
3491 | * used to add markers when two consecutive events' time | |
3492 | * stamps have a large delta. See trace_print_lat_context() | |
3493 | */ | |
3494 | if (iter->temp == static_temp_buf && | |
3495 | STATIC_TEMP_BUF_SIZE < ent_size) | |
3496 | return NULL; | |
3497 | ||
ff895103 SRV |
3498 | /* |
3499 | * The __find_next_entry() may call peek_next_entry(), which may | |
3500 | * call ring_buffer_peek() that may make the contents of iter->ent | |
3501 | * undefined. Need to copy iter->ent now. | |
3502 | */ | |
3503 | if (iter->ent && iter->ent != iter->temp) { | |
8e99cf91 SRV |
3504 | if ((!iter->temp || iter->temp_size < iter->ent_size) && |
3505 | !WARN_ON_ONCE(iter->temp == static_temp_buf)) { | |
ff895103 SRV |
3506 | kfree(iter->temp); |
3507 | iter->temp = kmalloc(iter->ent_size, GFP_KERNEL); | |
3508 | if (!iter->temp) | |
3509 | return NULL; | |
3510 | } | |
3511 | memcpy(iter->temp, iter->ent, iter->ent_size); | |
3512 | iter->temp_size = iter->ent_size; | |
3513 | iter->ent = iter->temp; | |
3514 | } | |
3515 | entry = __find_next_entry(iter, ent_cpu, NULL, ent_ts); | |
3516 | /* Put back the original ent_size */ | |
3517 | iter->ent_size = ent_size; | |
3518 | ||
3519 | return entry; | |
dd0e545f SR |
3520 | } |
3521 | ||
3522 | /* Find the next real entry, and increment the iterator to the next entry */ | |
955b61e5 | 3523 | void *trace_find_next_entry_inc(struct trace_iterator *iter) |
dd0e545f | 3524 | { |
bc21b478 SR |
3525 | iter->ent = __find_next_entry(iter, &iter->cpu, |
3526 | &iter->lost_events, &iter->ts); | |
dd0e545f | 3527 | |
3928a8a2 | 3528 | if (iter->ent) |
e2ac8ef5 | 3529 | trace_iterator_increment(iter); |
dd0e545f | 3530 | |
3928a8a2 | 3531 | return iter->ent ? iter : NULL; |
b3806b43 | 3532 | } |
bc0c38d1 | 3533 | |
e309b41d | 3534 | static void trace_consume(struct trace_iterator *iter) |
b3806b43 | 3535 | { |
1c5eb448 | 3536 | ring_buffer_consume(iter->array_buffer->buffer, iter->cpu, &iter->ts, |
bc21b478 | 3537 | &iter->lost_events); |
bc0c38d1 SR |
3538 | } |
3539 | ||
e309b41d | 3540 | static void *s_next(struct seq_file *m, void *v, loff_t *pos) |
bc0c38d1 SR |
3541 | { |
3542 | struct trace_iterator *iter = m->private; | |
bc0c38d1 | 3543 | int i = (int)*pos; |
4e3c3333 | 3544 | void *ent; |
bc0c38d1 | 3545 | |
a63ce5b3 SR |
3546 | WARN_ON_ONCE(iter->leftover); |
3547 | ||
bc0c38d1 SR |
3548 | (*pos)++; |
3549 | ||
3550 | /* can't go backwards */ | |
3551 | if (iter->idx > i) | |
3552 | return NULL; | |
3553 | ||
3554 | if (iter->idx < 0) | |
955b61e5 | 3555 | ent = trace_find_next_entry_inc(iter); |
bc0c38d1 SR |
3556 | else |
3557 | ent = iter; | |
3558 | ||
3559 | while (ent && iter->idx < i) | |
955b61e5 | 3560 | ent = trace_find_next_entry_inc(iter); |
bc0c38d1 SR |
3561 | |
3562 | iter->pos = *pos; | |
3563 | ||
bc0c38d1 SR |
3564 | return ent; |
3565 | } | |
3566 | ||
955b61e5 | 3567 | void tracing_iter_reset(struct trace_iterator *iter, int cpu) |
2f26ebd5 | 3568 | { |
2f26ebd5 SR |
3569 | struct ring_buffer_event *event; |
3570 | struct ring_buffer_iter *buf_iter; | |
3571 | unsigned long entries = 0; | |
3572 | u64 ts; | |
3573 | ||
1c5eb448 | 3574 | per_cpu_ptr(iter->array_buffer->data, cpu)->skipped_entries = 0; |
2f26ebd5 | 3575 | |
6d158a81 SR |
3576 | buf_iter = trace_buffer_iter(iter, cpu); |
3577 | if (!buf_iter) | |
2f26ebd5 SR |
3578 | return; |
3579 | ||
2f26ebd5 SR |
3580 | ring_buffer_iter_reset(buf_iter); |
3581 | ||
3582 | /* | |
3583 | * We could have the case with the max latency tracers | |
3584 | * that a reset never took place on a cpu. This is evident | |
3585 | * by the timestamp being before the start of the buffer. | |
3586 | */ | |
3587 | while ((event = ring_buffer_iter_peek(buf_iter, &ts))) { | |
1c5eb448 | 3588 | if (ts >= iter->array_buffer->time_start) |
2f26ebd5 SR |
3589 | break; |
3590 | entries++; | |
bc1a72af | 3591 | ring_buffer_iter_advance(buf_iter); |
2f26ebd5 SR |
3592 | } |
3593 | ||
1c5eb448 | 3594 | per_cpu_ptr(iter->array_buffer->data, cpu)->skipped_entries = entries; |
2f26ebd5 SR |
3595 | } |
3596 | ||
d7350c3f | 3597 | /* |
d7350c3f FW |
3598 | * The current tracer is copied to avoid a global locking |
3599 | * all around. | |
3600 | */ | |
bc0c38d1 SR |
3601 | static void *s_start(struct seq_file *m, loff_t *pos) |
3602 | { | |
3603 | struct trace_iterator *iter = m->private; | |
2b6080f2 | 3604 | struct trace_array *tr = iter->tr; |
b04cc6b1 | 3605 | int cpu_file = iter->cpu_file; |
bc0c38d1 SR |
3606 | void *p = NULL; |
3607 | loff_t l = 0; | |
3928a8a2 | 3608 | int cpu; |
bc0c38d1 | 3609 | |
2fd196ec HT |
3610 | /* |
3611 | * copy the tracer to avoid using a global lock all around. | |
3612 | * iter->trace is a copy of current_trace, the pointer to the | |
3613 | * name may be used instead of a strcmp(), as iter->trace->name | |
3614 | * will point to the same string as current_trace->name. | |
3615 | */ | |
bc0c38d1 | 3616 | mutex_lock(&trace_types_lock); |
2b6080f2 SR |
3617 | if (unlikely(tr->current_trace && iter->trace->name != tr->current_trace->name)) |
3618 | *iter->trace = *tr->current_trace; | |
d7350c3f | 3619 | mutex_unlock(&trace_types_lock); |
bc0c38d1 | 3620 | |
12883efb | 3621 | #ifdef CONFIG_TRACER_MAX_TRACE |
debdd57f HT |
3622 | if (iter->snapshot && iter->trace->use_max_tr) |
3623 | return ERR_PTR(-EBUSY); | |
12883efb | 3624 | #endif |
debdd57f HT |
3625 | |
3626 | if (!iter->snapshot) | |
d914ba37 | 3627 | atomic_inc(&trace_record_taskinfo_disabled); |
bc0c38d1 | 3628 | |
bc0c38d1 SR |
3629 | if (*pos != iter->pos) { |
3630 | iter->ent = NULL; | |
3631 | iter->cpu = 0; | |
3632 | iter->idx = -1; | |
3633 | ||
ae3b5093 | 3634 | if (cpu_file == RING_BUFFER_ALL_CPUS) { |
b04cc6b1 | 3635 | for_each_tracing_cpu(cpu) |
2f26ebd5 | 3636 | tracing_iter_reset(iter, cpu); |
b04cc6b1 | 3637 | } else |
2f26ebd5 | 3638 | tracing_iter_reset(iter, cpu_file); |
bc0c38d1 | 3639 | |
ac91d854 | 3640 | iter->leftover = 0; |
bc0c38d1 SR |
3641 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) |
3642 | ; | |
3643 | ||
3644 | } else { | |
a63ce5b3 SR |
3645 | /* |
3646 | * If we overflowed the seq_file before, then we want | |
3647 | * to just reuse the trace_seq buffer again. | |
3648 | */ | |
3649 | if (iter->leftover) | |
3650 | p = iter; | |
3651 | else { | |
3652 | l = *pos - 1; | |
3653 | p = s_next(m, p, &l); | |
3654 | } | |
bc0c38d1 SR |
3655 | } |
3656 | ||
4f535968 | 3657 | trace_event_read_lock(); |
7e53bd42 | 3658 | trace_access_lock(cpu_file); |
bc0c38d1 SR |
3659 | return p; |
3660 | } | |
3661 | ||
3662 | static void s_stop(struct seq_file *m, void *p) | |
3663 | { | |
7e53bd42 LJ |
3664 | struct trace_iterator *iter = m->private; |
3665 | ||
12883efb | 3666 | #ifdef CONFIG_TRACER_MAX_TRACE |
debdd57f HT |
3667 | if (iter->snapshot && iter->trace->use_max_tr) |
3668 | return; | |
12883efb | 3669 | #endif |
debdd57f HT |
3670 | |
3671 | if (!iter->snapshot) | |
d914ba37 | 3672 | atomic_dec(&trace_record_taskinfo_disabled); |
12883efb | 3673 | |
7e53bd42 | 3674 | trace_access_unlock(iter->cpu_file); |
4f535968 | 3675 | trace_event_read_unlock(); |
bc0c38d1 SR |
3676 | } |
3677 | ||
ecffc8a8 | 3678 | static void |
1c5eb448 | 3679 | get_total_entries_cpu(struct array_buffer *buf, unsigned long *total, |
ecffc8a8 DA |
3680 | unsigned long *entries, int cpu) |
3681 | { | |
3682 | unsigned long count; | |
3683 | ||
3684 | count = ring_buffer_entries_cpu(buf->buffer, cpu); | |
3685 | /* | |
3686 | * If this buffer has skipped entries, then we hold all | |
3687 | * entries for the trace and we need to ignore the | |
3688 | * ones before the time stamp. | |
3689 | */ | |
3690 | if (per_cpu_ptr(buf->data, cpu)->skipped_entries) { | |
3691 | count -= per_cpu_ptr(buf->data, cpu)->skipped_entries; | |
3692 | /* total is the same as the entries */ | |
3693 | *total = count; | |
3694 | } else | |
3695 | *total = count + | |
3696 | ring_buffer_overrun_cpu(buf->buffer, cpu); | |
3697 | *entries = count; | |
3698 | } | |
3699 | ||
39eaf7ef | 3700 | static void |
1c5eb448 | 3701 | get_total_entries(struct array_buffer *buf, |
12883efb | 3702 | unsigned long *total, unsigned long *entries) |
39eaf7ef | 3703 | { |
ecffc8a8 | 3704 | unsigned long t, e; |
39eaf7ef SR |
3705 | int cpu; |
3706 | ||
3707 | *total = 0; | |
3708 | *entries = 0; | |
3709 | ||
3710 | for_each_tracing_cpu(cpu) { | |
ecffc8a8 DA |
3711 | get_total_entries_cpu(buf, &t, &e, cpu); |
3712 | *total += t; | |
3713 | *entries += e; | |
39eaf7ef SR |
3714 | } |
3715 | } | |
3716 | ||
ecffc8a8 DA |
3717 | unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu) |
3718 | { | |
3719 | unsigned long total, entries; | |
3720 | ||
3721 | if (!tr) | |
3722 | tr = &global_trace; | |
3723 | ||
1c5eb448 | 3724 | get_total_entries_cpu(&tr->array_buffer, &total, &entries, cpu); |
ecffc8a8 DA |
3725 | |
3726 | return entries; | |
3727 | } | |
3728 | ||
3729 | unsigned long trace_total_entries(struct trace_array *tr) | |
3730 | { | |
3731 | unsigned long total, entries; | |
3732 | ||
3733 | if (!tr) | |
3734 | tr = &global_trace; | |
3735 | ||
1c5eb448 | 3736 | get_total_entries(&tr->array_buffer, &total, &entries); |
ecffc8a8 DA |
3737 | |
3738 | return entries; | |
3739 | } | |
3740 | ||
e309b41d | 3741 | static void print_lat_help_header(struct seq_file *m) |
bc0c38d1 | 3742 | { |
d79ac28f RV |
3743 | seq_puts(m, "# _------=> CPU# \n" |
3744 | "# / _-----=> irqs-off \n" | |
3745 | "# | / _----=> need-resched \n" | |
3746 | "# || / _---=> hardirq/softirq \n" | |
3747 | "# ||| / _--=> preempt-depth \n" | |
3748 | "# |||| / delay \n" | |
3749 | "# cmd pid ||||| time | caller \n" | |
3750 | "# \\ / ||||| \\ | / \n"); | |
bc0c38d1 SR |
3751 | } |
3752 | ||
1c5eb448 | 3753 | static void print_event_info(struct array_buffer *buf, struct seq_file *m) |
bc0c38d1 | 3754 | { |
39eaf7ef SR |
3755 | unsigned long total; |
3756 | unsigned long entries; | |
3757 | ||
12883efb | 3758 | get_total_entries(buf, &total, &entries); |
39eaf7ef SR |
3759 | seq_printf(m, "# entries-in-buffer/entries-written: %lu/%lu #P:%d\n", |
3760 | entries, total, num_online_cpus()); | |
3761 | seq_puts(m, "#\n"); | |
3762 | } | |
3763 | ||
1c5eb448 | 3764 | static void print_func_help_header(struct array_buffer *buf, struct seq_file *m, |
441dae8f | 3765 | unsigned int flags) |
39eaf7ef | 3766 | { |
441dae8f JF |
3767 | bool tgid = flags & TRACE_ITER_RECORD_TGID; |
3768 | ||
12883efb | 3769 | print_event_info(buf, m); |
441dae8f | 3770 | |
f8494fa3 JFG |
3771 | seq_printf(m, "# TASK-PID %s CPU# TIMESTAMP FUNCTION\n", tgid ? "TGID " : ""); |
3772 | seq_printf(m, "# | | %s | | |\n", tgid ? " | " : ""); | |
bc0c38d1 SR |
3773 | } |
3774 | ||
1c5eb448 | 3775 | static void print_func_help_header_irq(struct array_buffer *buf, struct seq_file *m, |
441dae8f | 3776 | unsigned int flags) |
77271ce4 | 3777 | { |
441dae8f | 3778 | bool tgid = flags & TRACE_ITER_RECORD_TGID; |
0f5e5a3a RV |
3779 | const char *space = " "; |
3780 | int prec = tgid ? 10 : 2; | |
b11fb737 | 3781 | |
9e738215 QP |
3782 | print_event_info(buf, m); |
3783 | ||
0f5e5a3a RV |
3784 | seq_printf(m, "# %.*s _-----=> irqs-off\n", prec, space); |
3785 | seq_printf(m, "# %.*s / _----=> need-resched\n", prec, space); | |
3786 | seq_printf(m, "# %.*s| / _---=> hardirq/softirq\n", prec, space); | |
3787 | seq_printf(m, "# %.*s|| / _--=> preempt-depth\n", prec, space); | |
3788 | seq_printf(m, "# %.*s||| / delay\n", prec, space); | |
3789 | seq_printf(m, "# TASK-PID %.*sCPU# |||| TIMESTAMP FUNCTION\n", prec, " TGID "); | |
3790 | seq_printf(m, "# | | %.*s | |||| | |\n", prec, " | "); | |
77271ce4 | 3791 | } |
bc0c38d1 | 3792 | |
62b915f1 | 3793 | void |
bc0c38d1 SR |
3794 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
3795 | { | |
983f938a | 3796 | unsigned long sym_flags = (global_trace.trace_flags & TRACE_ITER_SYM_MASK); |
1c5eb448 | 3797 | struct array_buffer *buf = iter->array_buffer; |
12883efb | 3798 | struct trace_array_cpu *data = per_cpu_ptr(buf->data, buf->cpu); |
2b6080f2 | 3799 | struct tracer *type = iter->trace; |
39eaf7ef SR |
3800 | unsigned long entries; |
3801 | unsigned long total; | |
bc0c38d1 SR |
3802 | const char *name = "preemption"; |
3803 | ||
d840f718 | 3804 | name = type->name; |
bc0c38d1 | 3805 | |
12883efb | 3806 | get_total_entries(buf, &total, &entries); |
bc0c38d1 | 3807 | |
888b55dc | 3808 | seq_printf(m, "# %s latency trace v1.1.5 on %s\n", |
bc0c38d1 | 3809 | name, UTS_RELEASE); |
888b55dc | 3810 | seq_puts(m, "# -----------------------------------" |
bc0c38d1 | 3811 | "---------------------------------\n"); |
888b55dc | 3812 | seq_printf(m, "# latency: %lu us, #%lu/%lu, CPU#%d |" |
bc0c38d1 | 3813 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", |
57f50be1 | 3814 | nsecs_to_usecs(data->saved_latency), |
bc0c38d1 | 3815 | entries, |
4c11d7ae | 3816 | total, |
12883efb | 3817 | buf->cpu, |
bc0c38d1 SR |
3818 | #if defined(CONFIG_PREEMPT_NONE) |
3819 | "server", | |
3820 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) | |
3821 | "desktop", | |
b5c21b45 | 3822 | #elif defined(CONFIG_PREEMPT) |
bc0c38d1 | 3823 | "preempt", |
9c34fc4b SAS |
3824 | #elif defined(CONFIG_PREEMPT_RT) |
3825 | "preempt_rt", | |
bc0c38d1 SR |
3826 | #else |
3827 | "unknown", | |
3828 | #endif | |
3829 | /* These are reserved for later use */ | |
3830 | 0, 0, 0, 0); | |
3831 | #ifdef CONFIG_SMP | |
3832 | seq_printf(m, " #P:%d)\n", num_online_cpus()); | |
3833 | #else | |
3834 | seq_puts(m, ")\n"); | |
3835 | #endif | |
888b55dc KM |
3836 | seq_puts(m, "# -----------------\n"); |
3837 | seq_printf(m, "# | task: %.16s-%d " | |
bc0c38d1 | 3838 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", |
d20b92ab EB |
3839 | data->comm, data->pid, |
3840 | from_kuid_munged(seq_user_ns(m), data->uid), data->nice, | |
bc0c38d1 | 3841 | data->policy, data->rt_priority); |
888b55dc | 3842 | seq_puts(m, "# -----------------\n"); |
bc0c38d1 SR |
3843 | |
3844 | if (data->critical_start) { | |
888b55dc | 3845 | seq_puts(m, "# => started at: "); |
214023c3 SR |
3846 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
3847 | trace_print_seq(m, &iter->seq); | |
888b55dc | 3848 | seq_puts(m, "\n# => ended at: "); |
214023c3 SR |
3849 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
3850 | trace_print_seq(m, &iter->seq); | |
8248ac05 | 3851 | seq_puts(m, "\n#\n"); |
bc0c38d1 SR |
3852 | } |
3853 | ||
888b55dc | 3854 | seq_puts(m, "#\n"); |
bc0c38d1 SR |
3855 | } |
3856 | ||
a309720c SR |
3857 | static void test_cpu_buff_start(struct trace_iterator *iter) |
3858 | { | |
3859 | struct trace_seq *s = &iter->seq; | |
983f938a | 3860 | struct trace_array *tr = iter->tr; |
a309720c | 3861 | |
983f938a | 3862 | if (!(tr->trace_flags & TRACE_ITER_ANNOTATE)) |
12ef7d44 SR |
3863 | return; |
3864 | ||
3865 | if (!(iter->iter_flags & TRACE_FILE_ANNOTATE)) | |
3866 | return; | |
3867 | ||
4dbbe2d8 MK |
3868 | if (cpumask_available(iter->started) && |
3869 | cpumask_test_cpu(iter->cpu, iter->started)) | |
a309720c SR |
3870 | return; |
3871 | ||
1c5eb448 | 3872 | if (per_cpu_ptr(iter->array_buffer->data, iter->cpu)->skipped_entries) |
2f26ebd5 SR |
3873 | return; |
3874 | ||
4dbbe2d8 | 3875 | if (cpumask_available(iter->started)) |
919cd979 | 3876 | cpumask_set_cpu(iter->cpu, iter->started); |
b0dfa978 FW |
3877 | |
3878 | /* Don't print started cpu buffer for the first entry of the trace */ | |
3879 | if (iter->idx > 1) | |
3880 | trace_seq_printf(s, "##### CPU %u buffer started ####\n", | |
3881 | iter->cpu); | |
a309720c SR |
3882 | } |
3883 | ||
2c4f035f | 3884 | static enum print_line_t print_trace_fmt(struct trace_iterator *iter) |
bc0c38d1 | 3885 | { |
983f938a | 3886 | struct trace_array *tr = iter->tr; |
214023c3 | 3887 | struct trace_seq *s = &iter->seq; |
983f938a | 3888 | unsigned long sym_flags = (tr->trace_flags & TRACE_ITER_SYM_MASK); |
4e3c3333 | 3889 | struct trace_entry *entry; |
f633cef0 | 3890 | struct trace_event *event; |
bc0c38d1 | 3891 | |
4e3c3333 | 3892 | entry = iter->ent; |
dd0e545f | 3893 | |
a309720c SR |
3894 | test_cpu_buff_start(iter); |
3895 | ||
c4a8e8be | 3896 | event = ftrace_find_event(entry->type); |
bc0c38d1 | 3897 | |
983f938a | 3898 | if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) { |
19a7fe20 SRRH |
3899 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) |
3900 | trace_print_lat_context(iter); | |
3901 | else | |
3902 | trace_print_context(iter); | |
c4a8e8be | 3903 | } |
bc0c38d1 | 3904 | |
19a7fe20 SRRH |
3905 | if (trace_seq_has_overflowed(s)) |
3906 | return TRACE_TYPE_PARTIAL_LINE; | |
3907 | ||
268ccda0 | 3908 | if (event) |
a9a57763 | 3909 | return event->funcs->trace(iter, sym_flags, event); |
d9793bd8 | 3910 | |
19a7fe20 | 3911 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
02b67518 | 3912 | |
19a7fe20 | 3913 | return trace_handle_return(s); |
bc0c38d1 SR |
3914 | } |
3915 | ||
2c4f035f | 3916 | static enum print_line_t print_raw_fmt(struct trace_iterator *iter) |
f9896bf3 | 3917 | { |
983f938a | 3918 | struct trace_array *tr = iter->tr; |
f9896bf3 IM |
3919 | struct trace_seq *s = &iter->seq; |
3920 | struct trace_entry *entry; | |
f633cef0 | 3921 | struct trace_event *event; |
f9896bf3 IM |
3922 | |
3923 | entry = iter->ent; | |
dd0e545f | 3924 | |
983f938a | 3925 | if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) |
19a7fe20 SRRH |
3926 | trace_seq_printf(s, "%d %d %llu ", |
3927 | entry->pid, iter->cpu, iter->ts); | |
3928 | ||
3929 | if (trace_seq_has_overflowed(s)) | |
3930 | return TRACE_TYPE_PARTIAL_LINE; | |
f9896bf3 | 3931 | |
f633cef0 | 3932 | event = ftrace_find_event(entry->type); |
268ccda0 | 3933 | if (event) |
a9a57763 | 3934 | return event->funcs->raw(iter, 0, event); |
d9793bd8 | 3935 | |
19a7fe20 | 3936 | trace_seq_printf(s, "%d ?\n", entry->type); |
777e208d | 3937 | |
19a7fe20 | 3938 | return trace_handle_return(s); |
f9896bf3 IM |
3939 | } |
3940 | ||
2c4f035f | 3941 | static enum print_line_t print_hex_fmt(struct trace_iterator *iter) |
5e3ca0ec | 3942 | { |
983f938a | 3943 | struct trace_array *tr = iter->tr; |
5e3ca0ec IM |
3944 | struct trace_seq *s = &iter->seq; |
3945 | unsigned char newline = '\n'; | |
3946 | struct trace_entry *entry; | |
f633cef0 | 3947 | struct trace_event *event; |
5e3ca0ec IM |
3948 | |
3949 | entry = iter->ent; | |
dd0e545f | 3950 | |
983f938a | 3951 | if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) { |
19a7fe20 SRRH |
3952 | SEQ_PUT_HEX_FIELD(s, entry->pid); |
3953 | SEQ_PUT_HEX_FIELD(s, iter->cpu); | |
3954 | SEQ_PUT_HEX_FIELD(s, iter->ts); | |
3955 | if (trace_seq_has_overflowed(s)) | |
3956 | return TRACE_TYPE_PARTIAL_LINE; | |
c4a8e8be | 3957 | } |
5e3ca0ec | 3958 | |
f633cef0 | 3959 | event = ftrace_find_event(entry->type); |
268ccda0 | 3960 | if (event) { |
a9a57763 | 3961 | enum print_line_t ret = event->funcs->hex(iter, 0, event); |
d9793bd8 ACM |
3962 | if (ret != TRACE_TYPE_HANDLED) |
3963 | return ret; | |
3964 | } | |
7104f300 | 3965 | |
19a7fe20 | 3966 | SEQ_PUT_FIELD(s, newline); |
5e3ca0ec | 3967 | |
19a7fe20 | 3968 | return trace_handle_return(s); |
5e3ca0ec IM |
3969 | } |
3970 | ||
2c4f035f | 3971 | static enum print_line_t print_bin_fmt(struct trace_iterator *iter) |
cb0f12aa | 3972 | { |
983f938a | 3973 | struct trace_array *tr = iter->tr; |
cb0f12aa IM |
3974 | struct trace_seq *s = &iter->seq; |
3975 | struct trace_entry *entry; | |
f633cef0 | 3976 | struct trace_event *event; |
cb0f12aa IM |
3977 | |
3978 | entry = iter->ent; | |
dd0e545f | 3979 | |
983f938a | 3980 | if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) { |
19a7fe20 SRRH |
3981 | SEQ_PUT_FIELD(s, entry->pid); |
3982 | SEQ_PUT_FIELD(s, iter->cpu); | |
3983 | SEQ_PUT_FIELD(s, iter->ts); | |
3984 | if (trace_seq_has_overflowed(s)) | |
3985 | return TRACE_TYPE_PARTIAL_LINE; | |
c4a8e8be | 3986 | } |
cb0f12aa | 3987 | |
f633cef0 | 3988 | event = ftrace_find_event(entry->type); |
a9a57763 SR |
3989 | return event ? event->funcs->binary(iter, 0, event) : |
3990 | TRACE_TYPE_HANDLED; | |
cb0f12aa IM |
3991 | } |
3992 | ||
62b915f1 | 3993 | int trace_empty(struct trace_iterator *iter) |
bc0c38d1 | 3994 | { |
6d158a81 | 3995 | struct ring_buffer_iter *buf_iter; |
bc0c38d1 SR |
3996 | int cpu; |
3997 | ||
9aba60fe | 3998 | /* If we are looking at one CPU buffer, only check that one */ |
ae3b5093 | 3999 | if (iter->cpu_file != RING_BUFFER_ALL_CPUS) { |
9aba60fe | 4000 | cpu = iter->cpu_file; |
6d158a81 SR |
4001 | buf_iter = trace_buffer_iter(iter, cpu); |
4002 | if (buf_iter) { | |
4003 | if (!ring_buffer_iter_empty(buf_iter)) | |
9aba60fe SR |
4004 | return 0; |
4005 | } else { | |
1c5eb448 | 4006 | if (!ring_buffer_empty_cpu(iter->array_buffer->buffer, cpu)) |
9aba60fe SR |
4007 | return 0; |
4008 | } | |
4009 | return 1; | |
4010 | } | |
4011 | ||
ab46428c | 4012 | for_each_tracing_cpu(cpu) { |
6d158a81 SR |
4013 | buf_iter = trace_buffer_iter(iter, cpu); |
4014 | if (buf_iter) { | |
4015 | if (!ring_buffer_iter_empty(buf_iter)) | |
d769041f SR |
4016 | return 0; |
4017 | } else { | |
1c5eb448 | 4018 | if (!ring_buffer_empty_cpu(iter->array_buffer->buffer, cpu)) |
d769041f SR |
4019 | return 0; |
4020 | } | |
bc0c38d1 | 4021 | } |
d769041f | 4022 | |
797d3712 | 4023 | return 1; |
bc0c38d1 SR |
4024 | } |
4025 | ||
4f535968 | 4026 | /* Called with trace_event_read_lock() held. */ |
955b61e5 | 4027 | enum print_line_t print_trace_line(struct trace_iterator *iter) |
f9896bf3 | 4028 | { |
983f938a SRRH |
4029 | struct trace_array *tr = iter->tr; |
4030 | unsigned long trace_flags = tr->trace_flags; | |
2c4f035f FW |
4031 | enum print_line_t ret; |
4032 | ||
19a7fe20 | 4033 | if (iter->lost_events) { |
c9b7a4a7 SRV |
4034 | if (iter->lost_events == (unsigned long)-1) |
4035 | trace_seq_printf(&iter->seq, "CPU:%d [LOST EVENTS]\n", | |
4036 | iter->cpu); | |
4037 | else | |
4038 | trace_seq_printf(&iter->seq, "CPU:%d [LOST %lu EVENTS]\n", | |
4039 | iter->cpu, iter->lost_events); | |
19a7fe20 SRRH |
4040 | if (trace_seq_has_overflowed(&iter->seq)) |
4041 | return TRACE_TYPE_PARTIAL_LINE; | |
4042 | } | |
bc21b478 | 4043 | |
2c4f035f FW |
4044 | if (iter->trace && iter->trace->print_line) { |
4045 | ret = iter->trace->print_line(iter); | |
4046 | if (ret != TRACE_TYPE_UNHANDLED) | |
4047 | return ret; | |
4048 | } | |
72829bc3 | 4049 | |
09ae7234 SRRH |
4050 | if (iter->ent->type == TRACE_BPUTS && |
4051 | trace_flags & TRACE_ITER_PRINTK && | |
4052 | trace_flags & TRACE_ITER_PRINTK_MSGONLY) | |
4053 | return trace_print_bputs_msg_only(iter); | |
4054 | ||
48ead020 FW |
4055 | if (iter->ent->type == TRACE_BPRINT && |
4056 | trace_flags & TRACE_ITER_PRINTK && | |
4057 | trace_flags & TRACE_ITER_PRINTK_MSGONLY) | |
5ef841f6 | 4058 | return trace_print_bprintk_msg_only(iter); |
48ead020 | 4059 | |
66896a85 FW |
4060 | if (iter->ent->type == TRACE_PRINT && |
4061 | trace_flags & TRACE_ITER_PRINTK && | |
4062 | trace_flags & TRACE_ITER_PRINTK_MSGONLY) | |
5ef841f6 | 4063 | return trace_print_printk_msg_only(iter); |
66896a85 | 4064 | |
cb0f12aa IM |
4065 | if (trace_flags & TRACE_ITER_BIN) |
4066 | return print_bin_fmt(iter); | |
4067 | ||
5e3ca0ec IM |
4068 | if (trace_flags & TRACE_ITER_HEX) |
4069 | return print_hex_fmt(iter); | |
4070 | ||
f9896bf3 IM |
4071 | if (trace_flags & TRACE_ITER_RAW) |
4072 | return print_raw_fmt(iter); | |
4073 | ||
f9896bf3 IM |
4074 | return print_trace_fmt(iter); |
4075 | } | |
4076 | ||
7e9a49ef JO |
4077 | void trace_latency_header(struct seq_file *m) |
4078 | { | |
4079 | struct trace_iterator *iter = m->private; | |
983f938a | 4080 | struct trace_array *tr = iter->tr; |
7e9a49ef JO |
4081 | |
4082 | /* print nothing if the buffers are empty */ | |
4083 | if (trace_empty(iter)) | |
4084 | return; | |
4085 | ||
4086 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) | |
4087 | print_trace_header(m, iter); | |
4088 | ||
983f938a | 4089 | if (!(tr->trace_flags & TRACE_ITER_VERBOSE)) |
7e9a49ef JO |
4090 | print_lat_help_header(m); |
4091 | } | |
4092 | ||
62b915f1 JO |
4093 | void trace_default_header(struct seq_file *m) |
4094 | { | |
4095 | struct trace_iterator *iter = m->private; | |
983f938a SRRH |
4096 | struct trace_array *tr = iter->tr; |
4097 | unsigned long trace_flags = tr->trace_flags; | |
62b915f1 | 4098 | |
f56e7f8e JO |
4099 | if (!(trace_flags & TRACE_ITER_CONTEXT_INFO)) |
4100 | return; | |
4101 | ||
62b915f1 JO |
4102 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { |
4103 | /* print nothing if the buffers are empty */ | |
4104 | if (trace_empty(iter)) | |
4105 | return; | |
4106 | print_trace_header(m, iter); | |
4107 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
4108 | print_lat_help_header(m); | |
4109 | } else { | |
77271ce4 SR |
4110 | if (!(trace_flags & TRACE_ITER_VERBOSE)) { |
4111 | if (trace_flags & TRACE_ITER_IRQ_INFO) | |
1c5eb448 | 4112 | print_func_help_header_irq(iter->array_buffer, |
441dae8f | 4113 | m, trace_flags); |
77271ce4 | 4114 | else |
1c5eb448 | 4115 | print_func_help_header(iter->array_buffer, m, |
441dae8f | 4116 | trace_flags); |
77271ce4 | 4117 | } |
62b915f1 JO |
4118 | } |
4119 | } | |
4120 | ||
e0a413f6 SR |
4121 | static void test_ftrace_alive(struct seq_file *m) |
4122 | { | |
4123 | if (!ftrace_is_dead()) | |
4124 | return; | |
d79ac28f RV |
4125 | seq_puts(m, "# WARNING: FUNCTION TRACING IS CORRUPTED\n" |
4126 | "# MAY BE MISSING FUNCTION EVENTS\n"); | |
e0a413f6 SR |
4127 | } |
4128 | ||
d8741e2e | 4129 | #ifdef CONFIG_TRACER_MAX_TRACE |
f1affcaa | 4130 | static void show_snapshot_main_help(struct seq_file *m) |
d8741e2e | 4131 | { |
d79ac28f RV |
4132 | seq_puts(m, "# echo 0 > snapshot : Clears and frees snapshot buffer\n" |
4133 | "# echo 1 > snapshot : Allocates snapshot buffer, if not already allocated.\n" | |
4134 | "# Takes a snapshot of the main buffer.\n" | |
4135 | "# echo 2 > snapshot : Clears snapshot buffer (but does not allocate or free)\n" | |
4136 | "# (Doesn't have to be '2' works with any number that\n" | |
4137 | "# is not a '0' or '1')\n"); | |
d8741e2e | 4138 | } |
f1affcaa SRRH |
4139 | |
4140 | static void show_snapshot_percpu_help(struct seq_file *m) | |
4141 | { | |
fa6f0cc7 | 4142 | seq_puts(m, "# echo 0 > snapshot : Invalid for per_cpu snapshot file.\n"); |
f1affcaa | 4143 | #ifdef CONFIG_RING_BUFFER_ALLOW_SWAP |
d79ac28f RV |
4144 | seq_puts(m, "# echo 1 > snapshot : Allocates snapshot buffer, if not already allocated.\n" |
4145 | "# Takes a snapshot of the main buffer for this cpu.\n"); | |
f1affcaa | 4146 | #else |
d79ac28f RV |
4147 | seq_puts(m, "# echo 1 > snapshot : Not supported with this kernel.\n" |
4148 | "# Must use main snapshot file to allocate.\n"); | |
f1affcaa | 4149 | #endif |
d79ac28f RV |
4150 | seq_puts(m, "# echo 2 > snapshot : Clears this cpu's snapshot buffer (but does not allocate)\n" |
4151 | "# (Doesn't have to be '2' works with any number that\n" | |
4152 | "# is not a '0' or '1')\n"); | |
f1affcaa SRRH |
4153 | } |
4154 | ||
d8741e2e SRRH |
4155 | static void print_snapshot_help(struct seq_file *m, struct trace_iterator *iter) |
4156 | { | |
45ad21ca | 4157 | if (iter->tr->allocated_snapshot) |
fa6f0cc7 | 4158 | seq_puts(m, "#\n# * Snapshot is allocated *\n#\n"); |
d8741e2e | 4159 | else |
fa6f0cc7 | 4160 | seq_puts(m, "#\n# * Snapshot is freed *\n#\n"); |
d8741e2e | 4161 | |
fa6f0cc7 | 4162 | seq_puts(m, "# Snapshot commands:\n"); |
f1affcaa SRRH |
4163 | if (iter->cpu_file == RING_BUFFER_ALL_CPUS) |
4164 | show_snapshot_main_help(m); | |
4165 | else | |
4166 | show_snapshot_percpu_help(m); | |
d8741e2e SRRH |
4167 | } |
4168 | #else | |
4169 | /* Should never be called */ | |
4170 | static inline void print_snapshot_help(struct seq_file *m, struct trace_iterator *iter) { } | |
4171 | #endif | |
4172 | ||
bc0c38d1 SR |
4173 | static int s_show(struct seq_file *m, void *v) |
4174 | { | |
4175 | struct trace_iterator *iter = v; | |
a63ce5b3 | 4176 | int ret; |
bc0c38d1 SR |
4177 | |
4178 | if (iter->ent == NULL) { | |
4179 | if (iter->tr) { | |
4180 | seq_printf(m, "# tracer: %s\n", iter->trace->name); | |
4181 | seq_puts(m, "#\n"); | |
e0a413f6 | 4182 | test_ftrace_alive(m); |
bc0c38d1 | 4183 | } |
d8741e2e SRRH |
4184 | if (iter->snapshot && trace_empty(iter)) |
4185 | print_snapshot_help(m, iter); | |
4186 | else if (iter->trace && iter->trace->print_header) | |
8bba1bf5 | 4187 | iter->trace->print_header(m); |
62b915f1 JO |
4188 | else |
4189 | trace_default_header(m); | |
4190 | ||
a63ce5b3 SR |
4191 | } else if (iter->leftover) { |
4192 | /* | |
4193 | * If we filled the seq_file buffer earlier, we | |
4194 | * want to just show it now. | |
4195 | */ | |
4196 | ret = trace_print_seq(m, &iter->seq); | |
4197 | ||
4198 | /* ret should this time be zero, but you never know */ | |
4199 | iter->leftover = ret; | |
4200 | ||
bc0c38d1 | 4201 | } else { |
f9896bf3 | 4202 | print_trace_line(iter); |
a63ce5b3 SR |
4203 | ret = trace_print_seq(m, &iter->seq); |
4204 | /* | |
4205 | * If we overflow the seq_file buffer, then it will | |
4206 | * ask us for this data again at start up. | |
4207 | * Use that instead. | |
4208 | * ret is 0 if seq_file write succeeded. | |
4209 | * -1 otherwise. | |
4210 | */ | |
4211 | iter->leftover = ret; | |
bc0c38d1 SR |
4212 | } |
4213 | ||
4214 | return 0; | |
4215 | } | |
4216 | ||
649e9c70 ON |
4217 | /* |
4218 | * Should be used after trace_array_get(), trace_types_lock | |
4219 | * ensures that i_cdev was already initialized. | |
4220 | */ | |
4221 | static inline int tracing_get_cpu(struct inode *inode) | |
4222 | { | |
4223 | if (inode->i_cdev) /* See trace_create_cpu_file() */ | |
4224 | return (long)inode->i_cdev - 1; | |
4225 | return RING_BUFFER_ALL_CPUS; | |
4226 | } | |
4227 | ||
88e9d34c | 4228 | static const struct seq_operations tracer_seq_ops = { |
4bf39a94 IM |
4229 | .start = s_start, |
4230 | .next = s_next, | |
4231 | .stop = s_stop, | |
4232 | .show = s_show, | |
bc0c38d1 SR |
4233 | }; |
4234 | ||
e309b41d | 4235 | static struct trace_iterator * |
6484c71c | 4236 | __tracing_open(struct inode *inode, struct file *file, bool snapshot) |
bc0c38d1 | 4237 | { |
6484c71c | 4238 | struct trace_array *tr = inode->i_private; |
bc0c38d1 | 4239 | struct trace_iterator *iter; |
50e18b94 | 4240 | int cpu; |
bc0c38d1 | 4241 | |
85a2f9b4 SR |
4242 | if (tracing_disabled) |
4243 | return ERR_PTR(-ENODEV); | |
60a11774 | 4244 | |
50e18b94 | 4245 | iter = __seq_open_private(file, &tracer_seq_ops, sizeof(*iter)); |
85a2f9b4 SR |
4246 | if (!iter) |
4247 | return ERR_PTR(-ENOMEM); | |
bc0c38d1 | 4248 | |
72917235 | 4249 | iter->buffer_iter = kcalloc(nr_cpu_ids, sizeof(*iter->buffer_iter), |
6d158a81 | 4250 | GFP_KERNEL); |
93574fcc DC |
4251 | if (!iter->buffer_iter) |
4252 | goto release; | |
4253 | ||
ff895103 SRV |
4254 | /* |
4255 | * trace_find_next_entry() may need to save off iter->ent. | |
4256 | * It will place it into the iter->temp buffer. As most | |
4257 | * events are less than 128, allocate a buffer of that size. | |
4258 | * If one is greater, then trace_find_next_entry() will | |
4259 | * allocate a new buffer to adjust for the bigger iter->ent. | |
4260 | * It's not critical if it fails to get allocated here. | |
4261 | */ | |
4262 | iter->temp = kmalloc(128, GFP_KERNEL); | |
4263 | if (iter->temp) | |
4264 | iter->temp_size = 128; | |
4265 | ||
d7350c3f FW |
4266 | /* |
4267 | * We make a copy of the current tracer to avoid concurrent | |
4268 | * changes on it while we are reading. | |
4269 | */ | |
bc0c38d1 | 4270 | mutex_lock(&trace_types_lock); |
d7350c3f | 4271 | iter->trace = kzalloc(sizeof(*iter->trace), GFP_KERNEL); |
85a2f9b4 | 4272 | if (!iter->trace) |
d7350c3f | 4273 | goto fail; |
85a2f9b4 | 4274 | |
2b6080f2 | 4275 | *iter->trace = *tr->current_trace; |
d7350c3f | 4276 | |
79f55997 | 4277 | if (!zalloc_cpumask_var(&iter->started, GFP_KERNEL)) |
b0dfa978 FW |
4278 | goto fail; |
4279 | ||
12883efb SRRH |
4280 | iter->tr = tr; |
4281 | ||
4282 | #ifdef CONFIG_TRACER_MAX_TRACE | |
2b6080f2 SR |
4283 | /* Currently only the top directory has a snapshot */ |
4284 | if (tr->current_trace->print_max || snapshot) | |
1c5eb448 | 4285 | iter->array_buffer = &tr->max_buffer; |
bc0c38d1 | 4286 | else |
12883efb | 4287 | #endif |
1c5eb448 | 4288 | iter->array_buffer = &tr->array_buffer; |
debdd57f | 4289 | iter->snapshot = snapshot; |
bc0c38d1 | 4290 | iter->pos = -1; |
6484c71c | 4291 | iter->cpu_file = tracing_get_cpu(inode); |
d7350c3f | 4292 | mutex_init(&iter->mutex); |
bc0c38d1 | 4293 | |
8bba1bf5 | 4294 | /* Notify the tracer early; before we stop tracing. */ |
b3f7a6cd | 4295 | if (iter->trace->open) |
a93751ca | 4296 | iter->trace->open(iter); |
8bba1bf5 | 4297 | |
12ef7d44 | 4298 | /* Annotate start of buffers if we had overruns */ |
1c5eb448 | 4299 | if (ring_buffer_overruns(iter->array_buffer->buffer)) |
12ef7d44 SR |
4300 | iter->iter_flags |= TRACE_FILE_ANNOTATE; |
4301 | ||
8be0709f | 4302 | /* Output in nanoseconds only if we are using a clock in nanoseconds. */ |
58e8eedf | 4303 | if (trace_clocks[tr->clock_id].in_ns) |
8be0709f DS |
4304 | iter->iter_flags |= TRACE_FILE_TIME_IN_NS; |
4305 | ||
06e0a548 SRV |
4306 | /* |
4307 | * If pause-on-trace is enabled, then stop the trace while | |
4308 | * dumping, unless this is the "snapshot" file | |
4309 | */ | |
4310 | if (!iter->snapshot && (tr->trace_flags & TRACE_ITER_PAUSE_ON_TRACE)) | |
2b6080f2 | 4311 | tracing_stop_tr(tr); |
2f26ebd5 | 4312 | |
ae3b5093 | 4313 | if (iter->cpu_file == RING_BUFFER_ALL_CPUS) { |
b04cc6b1 | 4314 | for_each_tracing_cpu(cpu) { |
b04cc6b1 | 4315 | iter->buffer_iter[cpu] = |
1c5eb448 | 4316 | ring_buffer_read_prepare(iter->array_buffer->buffer, |
31b265b3 | 4317 | cpu, GFP_KERNEL); |
72c9ddfd DM |
4318 | } |
4319 | ring_buffer_read_prepare_sync(); | |
4320 | for_each_tracing_cpu(cpu) { | |
4321 | ring_buffer_read_start(iter->buffer_iter[cpu]); | |
2f26ebd5 | 4322 | tracing_iter_reset(iter, cpu); |
b04cc6b1 FW |
4323 | } |
4324 | } else { | |
4325 | cpu = iter->cpu_file; | |
3928a8a2 | 4326 | iter->buffer_iter[cpu] = |
1c5eb448 | 4327 | ring_buffer_read_prepare(iter->array_buffer->buffer, |
31b265b3 | 4328 | cpu, GFP_KERNEL); |
72c9ddfd DM |
4329 | ring_buffer_read_prepare_sync(); |
4330 | ring_buffer_read_start(iter->buffer_iter[cpu]); | |
2f26ebd5 | 4331 | tracing_iter_reset(iter, cpu); |
3928a8a2 SR |
4332 | } |
4333 | ||
bc0c38d1 SR |
4334 | mutex_unlock(&trace_types_lock); |
4335 | ||
bc0c38d1 | 4336 | return iter; |
3928a8a2 | 4337 | |
d7350c3f | 4338 | fail: |
3928a8a2 | 4339 | mutex_unlock(&trace_types_lock); |
d7350c3f | 4340 | kfree(iter->trace); |
ff895103 | 4341 | kfree(iter->temp); |
6d158a81 | 4342 | kfree(iter->buffer_iter); |
93574fcc | 4343 | release: |
50e18b94 JO |
4344 | seq_release_private(inode, file); |
4345 | return ERR_PTR(-ENOMEM); | |
bc0c38d1 SR |
4346 | } |
4347 | ||
4348 | int tracing_open_generic(struct inode *inode, struct file *filp) | |
4349 | { | |
8530dec6 SRV |
4350 | int ret; |
4351 | ||
4352 | ret = tracing_check_open_get_tr(NULL); | |
4353 | if (ret) | |
4354 | return ret; | |
60a11774 | 4355 | |
bc0c38d1 SR |
4356 | filp->private_data = inode->i_private; |
4357 | return 0; | |
4358 | } | |
4359 | ||
2e86421d GB |
4360 | bool tracing_is_disabled(void) |
4361 | { | |
4362 | return (tracing_disabled) ? true: false; | |
4363 | } | |
4364 | ||
7b85af63 SRRH |
4365 | /* |
4366 | * Open and update trace_array ref count. | |
4367 | * Must have the current trace_array passed to it. | |
4368 | */ | |
aa07d71f | 4369 | int tracing_open_generic_tr(struct inode *inode, struct file *filp) |
7b85af63 SRRH |
4370 | { |
4371 | struct trace_array *tr = inode->i_private; | |
8530dec6 | 4372 | int ret; |
7b85af63 | 4373 | |
8530dec6 SRV |
4374 | ret = tracing_check_open_get_tr(tr); |
4375 | if (ret) | |
4376 | return ret; | |
7b85af63 SRRH |
4377 | |
4378 | filp->private_data = inode->i_private; | |
4379 | ||
4380 | return 0; | |
7b85af63 SRRH |
4381 | } |
4382 | ||
4fd27358 | 4383 | static int tracing_release(struct inode *inode, struct file *file) |
bc0c38d1 | 4384 | { |
6484c71c | 4385 | struct trace_array *tr = inode->i_private; |
907f2784 | 4386 | struct seq_file *m = file->private_data; |
4acd4d00 | 4387 | struct trace_iterator *iter; |
3928a8a2 | 4388 | int cpu; |
bc0c38d1 | 4389 | |
ff451961 | 4390 | if (!(file->f_mode & FMODE_READ)) { |
6484c71c | 4391 | trace_array_put(tr); |
4acd4d00 | 4392 | return 0; |
ff451961 | 4393 | } |
4acd4d00 | 4394 | |
6484c71c | 4395 | /* Writes do not use seq_file */ |
4acd4d00 | 4396 | iter = m->private; |
bc0c38d1 | 4397 | mutex_lock(&trace_types_lock); |
a695cb58 | 4398 | |
3928a8a2 SR |
4399 | for_each_tracing_cpu(cpu) { |
4400 | if (iter->buffer_iter[cpu]) | |
4401 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
4402 | } | |
4403 | ||
bc0c38d1 SR |
4404 | if (iter->trace && iter->trace->close) |
4405 | iter->trace->close(iter); | |
4406 | ||
06e0a548 | 4407 | if (!iter->snapshot && tr->stop_count) |
debdd57f | 4408 | /* reenable tracing if it was previously enabled */ |
2b6080f2 | 4409 | tracing_start_tr(tr); |
f77d09a3 AL |
4410 | |
4411 | __trace_array_put(tr); | |
4412 | ||
bc0c38d1 SR |
4413 | mutex_unlock(&trace_types_lock); |
4414 | ||
d7350c3f | 4415 | mutex_destroy(&iter->mutex); |
b0dfa978 | 4416 | free_cpumask_var(iter->started); |
ff895103 | 4417 | kfree(iter->temp); |
d7350c3f | 4418 | kfree(iter->trace); |
6d158a81 | 4419 | kfree(iter->buffer_iter); |
50e18b94 | 4420 | seq_release_private(inode, file); |
ff451961 | 4421 | |
bc0c38d1 SR |
4422 | return 0; |
4423 | } | |
4424 | ||
7b85af63 SRRH |
4425 | static int tracing_release_generic_tr(struct inode *inode, struct file *file) |
4426 | { | |
4427 | struct trace_array *tr = inode->i_private; | |
4428 | ||
4429 | trace_array_put(tr); | |
bc0c38d1 SR |
4430 | return 0; |
4431 | } | |
4432 | ||
7b85af63 SRRH |
4433 | static int tracing_single_release_tr(struct inode *inode, struct file *file) |
4434 | { | |
4435 | struct trace_array *tr = inode->i_private; | |
4436 | ||
4437 | trace_array_put(tr); | |
4438 | ||
4439 | return single_release(inode, file); | |
4440 | } | |
4441 | ||
bc0c38d1 SR |
4442 | static int tracing_open(struct inode *inode, struct file *file) |
4443 | { | |
6484c71c | 4444 | struct trace_array *tr = inode->i_private; |
85a2f9b4 | 4445 | struct trace_iterator *iter; |
8530dec6 | 4446 | int ret; |
bc0c38d1 | 4447 | |
8530dec6 SRV |
4448 | ret = tracing_check_open_get_tr(tr); |
4449 | if (ret) | |
4450 | return ret; | |
ff451961 | 4451 | |
4acd4d00 | 4452 | /* If this file was open for write, then erase contents */ |
6484c71c ON |
4453 | if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) { |
4454 | int cpu = tracing_get_cpu(inode); | |
1c5eb448 | 4455 | struct array_buffer *trace_buf = &tr->array_buffer; |
8dd33bcb BY |
4456 | |
4457 | #ifdef CONFIG_TRACER_MAX_TRACE | |
4458 | if (tr->current_trace->print_max) | |
4459 | trace_buf = &tr->max_buffer; | |
4460 | #endif | |
6484c71c ON |
4461 | |
4462 | if (cpu == RING_BUFFER_ALL_CPUS) | |
8dd33bcb | 4463 | tracing_reset_online_cpus(trace_buf); |
4acd4d00 | 4464 | else |
a47b53e9 | 4465 | tracing_reset_cpu(trace_buf, cpu); |
4acd4d00 | 4466 | } |
bc0c38d1 | 4467 | |
4acd4d00 | 4468 | if (file->f_mode & FMODE_READ) { |
6484c71c | 4469 | iter = __tracing_open(inode, file, false); |
4acd4d00 SR |
4470 | if (IS_ERR(iter)) |
4471 | ret = PTR_ERR(iter); | |
983f938a | 4472 | else if (tr->trace_flags & TRACE_ITER_LATENCY_FMT) |
4acd4d00 SR |
4473 | iter->iter_flags |= TRACE_FILE_LAT_FMT; |
4474 | } | |
ff451961 SRRH |
4475 | |
4476 | if (ret < 0) | |
4477 | trace_array_put(tr); | |
4478 | ||
bc0c38d1 SR |
4479 | return ret; |
4480 | } | |
4481 | ||
607e2ea1 SRRH |
4482 | /* |
4483 | * Some tracers are not suitable for instance buffers. | |
4484 | * A tracer is always available for the global array (toplevel) | |
4485 | * or if it explicitly states that it is. | |
4486 | */ | |
4487 | static bool | |
4488 | trace_ok_for_array(struct tracer *t, struct trace_array *tr) | |
4489 | { | |
4490 | return (tr->flags & TRACE_ARRAY_FL_GLOBAL) || t->allow_instances; | |
4491 | } | |
4492 | ||
4493 | /* Find the next tracer that this trace array may use */ | |
4494 | static struct tracer * | |
4495 | get_tracer_for_array(struct trace_array *tr, struct tracer *t) | |
4496 | { | |
4497 | while (t && !trace_ok_for_array(t, tr)) | |
4498 | t = t->next; | |
4499 | ||
4500 | return t; | |
4501 | } | |
4502 | ||
e309b41d | 4503 | static void * |
bc0c38d1 SR |
4504 | t_next(struct seq_file *m, void *v, loff_t *pos) |
4505 | { | |
607e2ea1 | 4506 | struct trace_array *tr = m->private; |
f129e965 | 4507 | struct tracer *t = v; |
bc0c38d1 SR |
4508 | |
4509 | (*pos)++; | |
4510 | ||
4511 | if (t) | |
607e2ea1 | 4512 | t = get_tracer_for_array(tr, t->next); |
bc0c38d1 | 4513 | |
bc0c38d1 SR |
4514 | return t; |
4515 | } | |
4516 | ||
4517 | static void *t_start(struct seq_file *m, loff_t *pos) | |
4518 | { | |
607e2ea1 | 4519 | struct trace_array *tr = m->private; |
f129e965 | 4520 | struct tracer *t; |
bc0c38d1 SR |
4521 | loff_t l = 0; |
4522 | ||
4523 | mutex_lock(&trace_types_lock); | |
607e2ea1 SRRH |
4524 | |
4525 | t = get_tracer_for_array(tr, trace_types); | |
4526 | for (; t && l < *pos; t = t_next(m, t, &l)) | |
4527 | ; | |
bc0c38d1 SR |
4528 | |
4529 | return t; | |
4530 | } | |
4531 | ||
4532 | static void t_stop(struct seq_file *m, void *p) | |
4533 | { | |
4534 | mutex_unlock(&trace_types_lock); | |
4535 | } | |
4536 | ||
4537 | static int t_show(struct seq_file *m, void *v) | |
4538 | { | |
4539 | struct tracer *t = v; | |
4540 | ||
4541 | if (!t) | |
4542 | return 0; | |
4543 | ||
fa6f0cc7 | 4544 | seq_puts(m, t->name); |
bc0c38d1 SR |
4545 | if (t->next) |
4546 | seq_putc(m, ' '); | |
4547 | else | |
4548 | seq_putc(m, '\n'); | |
4549 | ||
4550 | return 0; | |
4551 | } | |
4552 | ||
88e9d34c | 4553 | static const struct seq_operations show_traces_seq_ops = { |
4bf39a94 IM |
4554 | .start = t_start, |
4555 | .next = t_next, | |
4556 | .stop = t_stop, | |
4557 | .show = t_show, | |
bc0c38d1 SR |
4558 | }; |
4559 | ||
4560 | static int show_traces_open(struct inode *inode, struct file *file) | |
4561 | { | |
607e2ea1 SRRH |
4562 | struct trace_array *tr = inode->i_private; |
4563 | struct seq_file *m; | |
4564 | int ret; | |
4565 | ||
8530dec6 SRV |
4566 | ret = tracing_check_open_get_tr(tr); |
4567 | if (ret) | |
4568 | return ret; | |
194c2c74 | 4569 | |
607e2ea1 | 4570 | ret = seq_open(file, &show_traces_seq_ops); |
194c2c74 SRV |
4571 | if (ret) { |
4572 | trace_array_put(tr); | |
607e2ea1 | 4573 | return ret; |
194c2c74 | 4574 | } |
607e2ea1 SRRH |
4575 | |
4576 | m = file->private_data; | |
4577 | m->private = tr; | |
4578 | ||
4579 | return 0; | |
bc0c38d1 SR |
4580 | } |
4581 | ||
194c2c74 SRV |
4582 | static int show_traces_release(struct inode *inode, struct file *file) |
4583 | { | |
4584 | struct trace_array *tr = inode->i_private; | |
4585 | ||
4586 | trace_array_put(tr); | |
4587 | return seq_release(inode, file); | |
4588 | } | |
4589 | ||
4acd4d00 SR |
4590 | static ssize_t |
4591 | tracing_write_stub(struct file *filp, const char __user *ubuf, | |
4592 | size_t count, loff_t *ppos) | |
4593 | { | |
4594 | return count; | |
4595 | } | |
4596 | ||
098c879e | 4597 | loff_t tracing_lseek(struct file *file, loff_t offset, int whence) |
364829b1 | 4598 | { |
098c879e SRRH |
4599 | int ret; |
4600 | ||
364829b1 | 4601 | if (file->f_mode & FMODE_READ) |
098c879e | 4602 | ret = seq_lseek(file, offset, whence); |
364829b1 | 4603 | else |
098c879e SRRH |
4604 | file->f_pos = ret = 0; |
4605 | ||
4606 | return ret; | |
364829b1 SP |
4607 | } |
4608 | ||
5e2336a0 | 4609 | static const struct file_operations tracing_fops = { |
4bf39a94 IM |
4610 | .open = tracing_open, |
4611 | .read = seq_read, | |
4acd4d00 | 4612 | .write = tracing_write_stub, |
098c879e | 4613 | .llseek = tracing_lseek, |
4bf39a94 | 4614 | .release = tracing_release, |
bc0c38d1 SR |
4615 | }; |
4616 | ||
5e2336a0 | 4617 | static const struct file_operations show_traces_fops = { |
c7078de1 IM |
4618 | .open = show_traces_open, |
4619 | .read = seq_read, | |
b444786f | 4620 | .llseek = seq_lseek, |
194c2c74 | 4621 | .release = show_traces_release, |
c7078de1 IM |
4622 | }; |
4623 | ||
4624 | static ssize_t | |
4625 | tracing_cpumask_read(struct file *filp, char __user *ubuf, | |
4626 | size_t count, loff_t *ppos) | |
4627 | { | |
ccfe9e42 | 4628 | struct trace_array *tr = file_inode(filp)->i_private; |
90e406f9 | 4629 | char *mask_str; |
36dfe925 | 4630 | int len; |
c7078de1 | 4631 | |
90e406f9 CD |
4632 | len = snprintf(NULL, 0, "%*pb\n", |
4633 | cpumask_pr_args(tr->tracing_cpumask)) + 1; | |
4634 | mask_str = kmalloc(len, GFP_KERNEL); | |
4635 | if (!mask_str) | |
4636 | return -ENOMEM; | |
36dfe925 | 4637 | |
90e406f9 | 4638 | len = snprintf(mask_str, len, "%*pb\n", |
1a40243b TH |
4639 | cpumask_pr_args(tr->tracing_cpumask)); |
4640 | if (len >= count) { | |
36dfe925 IM |
4641 | count = -EINVAL; |
4642 | goto out_err; | |
4643 | } | |
90e406f9 | 4644 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, len); |
36dfe925 IM |
4645 | |
4646 | out_err: | |
90e406f9 | 4647 | kfree(mask_str); |
c7078de1 IM |
4648 | |
4649 | return count; | |
4650 | } | |
4651 | ||
9d15dbbd MH |
4652 | int tracing_set_cpumask(struct trace_array *tr, |
4653 | cpumask_var_t tracing_cpumask_new) | |
c7078de1 | 4654 | { |
9d15dbbd | 4655 | int cpu; |
c7078de1 | 4656 | |
9d15dbbd MH |
4657 | if (!tr) |
4658 | return -EINVAL; | |
36dfe925 | 4659 | |
a5e25883 | 4660 | local_irq_disable(); |
0b9b12c1 | 4661 | arch_spin_lock(&tr->max_lock); |
ab46428c | 4662 | for_each_tracing_cpu(cpu) { |
36dfe925 IM |
4663 | /* |
4664 | * Increase/decrease the disabled counter if we are | |
4665 | * about to flip a bit in the cpumask: | |
4666 | */ | |
ccfe9e42 | 4667 | if (cpumask_test_cpu(cpu, tr->tracing_cpumask) && |
9e01c1b7 | 4668 | !cpumask_test_cpu(cpu, tracing_cpumask_new)) { |
1c5eb448 SRV |
4669 | atomic_inc(&per_cpu_ptr(tr->array_buffer.data, cpu)->disabled); |
4670 | ring_buffer_record_disable_cpu(tr->array_buffer.buffer, cpu); | |
36dfe925 | 4671 | } |
ccfe9e42 | 4672 | if (!cpumask_test_cpu(cpu, tr->tracing_cpumask) && |
9e01c1b7 | 4673 | cpumask_test_cpu(cpu, tracing_cpumask_new)) { |
1c5eb448 SRV |
4674 | atomic_dec(&per_cpu_ptr(tr->array_buffer.data, cpu)->disabled); |
4675 | ring_buffer_record_enable_cpu(tr->array_buffer.buffer, cpu); | |
36dfe925 IM |
4676 | } |
4677 | } | |
0b9b12c1 | 4678 | arch_spin_unlock(&tr->max_lock); |
a5e25883 | 4679 | local_irq_enable(); |
36dfe925 | 4680 | |
ccfe9e42 | 4681 | cpumask_copy(tr->tracing_cpumask, tracing_cpumask_new); |
9d15dbbd MH |
4682 | |
4683 | return 0; | |
4684 | } | |
4685 | ||
4686 | static ssize_t | |
4687 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, | |
4688 | size_t count, loff_t *ppos) | |
4689 | { | |
4690 | struct trace_array *tr = file_inode(filp)->i_private; | |
4691 | cpumask_var_t tracing_cpumask_new; | |
4692 | int err; | |
4693 | ||
4694 | if (!alloc_cpumask_var(&tracing_cpumask_new, GFP_KERNEL)) | |
4695 | return -ENOMEM; | |
4696 | ||
4697 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); | |
4698 | if (err) | |
4699 | goto err_free; | |
4700 | ||
4701 | err = tracing_set_cpumask(tr, tracing_cpumask_new); | |
4702 | if (err) | |
4703 | goto err_free; | |
4704 | ||
9e01c1b7 | 4705 | free_cpumask_var(tracing_cpumask_new); |
c7078de1 IM |
4706 | |
4707 | return count; | |
36dfe925 | 4708 | |
9d15dbbd | 4709 | err_free: |
215368e8 | 4710 | free_cpumask_var(tracing_cpumask_new); |
36dfe925 IM |
4711 | |
4712 | return err; | |
c7078de1 IM |
4713 | } |
4714 | ||
5e2336a0 | 4715 | static const struct file_operations tracing_cpumask_fops = { |
ccfe9e42 | 4716 | .open = tracing_open_generic_tr, |
c7078de1 IM |
4717 | .read = tracing_cpumask_read, |
4718 | .write = tracing_cpumask_write, | |
ccfe9e42 | 4719 | .release = tracing_release_generic_tr, |
b444786f | 4720 | .llseek = generic_file_llseek, |
bc0c38d1 SR |
4721 | }; |
4722 | ||
fdb372ed | 4723 | static int tracing_trace_options_show(struct seq_file *m, void *v) |
bc0c38d1 | 4724 | { |
d8e83d26 | 4725 | struct tracer_opt *trace_opts; |
2b6080f2 | 4726 | struct trace_array *tr = m->private; |
d8e83d26 | 4727 | u32 tracer_flags; |
d8e83d26 | 4728 | int i; |
adf9f195 | 4729 | |
d8e83d26 | 4730 | mutex_lock(&trace_types_lock); |
2b6080f2 SR |
4731 | tracer_flags = tr->current_trace->flags->val; |
4732 | trace_opts = tr->current_trace->flags->opts; | |
d8e83d26 | 4733 | |
bc0c38d1 | 4734 | for (i = 0; trace_options[i]; i++) { |
983f938a | 4735 | if (tr->trace_flags & (1 << i)) |
fdb372ed | 4736 | seq_printf(m, "%s\n", trace_options[i]); |
bc0c38d1 | 4737 | else |
fdb372ed | 4738 | seq_printf(m, "no%s\n", trace_options[i]); |
bc0c38d1 SR |
4739 | } |
4740 | ||
adf9f195 FW |
4741 | for (i = 0; trace_opts[i].name; i++) { |
4742 | if (tracer_flags & trace_opts[i].bit) | |
fdb372ed | 4743 | seq_printf(m, "%s\n", trace_opts[i].name); |
adf9f195 | 4744 | else |
fdb372ed | 4745 | seq_printf(m, "no%s\n", trace_opts[i].name); |
adf9f195 | 4746 | } |
d8e83d26 | 4747 | mutex_unlock(&trace_types_lock); |
adf9f195 | 4748 | |
fdb372ed | 4749 | return 0; |
bc0c38d1 | 4750 | } |
bc0c38d1 | 4751 | |
8c1a49ae | 4752 | static int __set_tracer_option(struct trace_array *tr, |
8d18eaaf LZ |
4753 | struct tracer_flags *tracer_flags, |
4754 | struct tracer_opt *opts, int neg) | |
4755 | { | |
d39cdd20 | 4756 | struct tracer *trace = tracer_flags->trace; |
8d18eaaf | 4757 | int ret; |
bc0c38d1 | 4758 | |
8c1a49ae | 4759 | ret = trace->set_flag(tr, tracer_flags->val, opts->bit, !neg); |
8d18eaaf LZ |
4760 | if (ret) |
4761 | return ret; | |
4762 | ||
4763 | if (neg) | |
4764 | tracer_flags->val &= ~opts->bit; | |
4765 | else | |
4766 | tracer_flags->val |= opts->bit; | |
4767 | return 0; | |
bc0c38d1 SR |
4768 | } |
4769 | ||
adf9f195 | 4770 | /* Try to assign a tracer specific option */ |
8c1a49ae | 4771 | static int set_tracer_option(struct trace_array *tr, char *cmp, int neg) |
adf9f195 | 4772 | { |
8c1a49ae | 4773 | struct tracer *trace = tr->current_trace; |
7770841e | 4774 | struct tracer_flags *tracer_flags = trace->flags; |
adf9f195 | 4775 | struct tracer_opt *opts = NULL; |
8d18eaaf | 4776 | int i; |
adf9f195 | 4777 | |
7770841e Z |
4778 | for (i = 0; tracer_flags->opts[i].name; i++) { |
4779 | opts = &tracer_flags->opts[i]; | |
adf9f195 | 4780 | |
8d18eaaf | 4781 | if (strcmp(cmp, opts->name) == 0) |
8c1a49ae | 4782 | return __set_tracer_option(tr, trace->flags, opts, neg); |
adf9f195 | 4783 | } |
adf9f195 | 4784 | |
8d18eaaf | 4785 | return -EINVAL; |
adf9f195 FW |
4786 | } |
4787 | ||
613f04a0 SRRH |
4788 | /* Some tracers require overwrite to stay enabled */ |
4789 | int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set) | |
4790 | { | |
4791 | if (tracer->enabled && (mask & TRACE_ITER_OVERWRITE) && !set) | |
4792 | return -1; | |
4793 | ||
4794 | return 0; | |
4795 | } | |
4796 | ||
2b6080f2 | 4797 | int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled) |
af4617bd | 4798 | { |
3a53acf1 PS |
4799 | if ((mask == TRACE_ITER_RECORD_TGID) || |
4800 | (mask == TRACE_ITER_RECORD_CMD)) | |
4801 | lockdep_assert_held(&event_mutex); | |
4802 | ||
af4617bd | 4803 | /* do nothing if flag is already set */ |
983f938a | 4804 | if (!!(tr->trace_flags & mask) == !!enabled) |
613f04a0 SRRH |
4805 | return 0; |
4806 | ||
4807 | /* Give the tracer a chance to approve the change */ | |
2b6080f2 | 4808 | if (tr->current_trace->flag_changed) |
bf6065b5 | 4809 | if (tr->current_trace->flag_changed(tr, mask, !!enabled)) |
613f04a0 | 4810 | return -EINVAL; |
af4617bd SR |
4811 | |
4812 | if (enabled) | |
983f938a | 4813 | tr->trace_flags |= mask; |
af4617bd | 4814 | else |
983f938a | 4815 | tr->trace_flags &= ~mask; |
e870e9a1 LZ |
4816 | |
4817 | if (mask == TRACE_ITER_RECORD_CMD) | |
4818 | trace_event_enable_cmd_record(enabled); | |
750912fa | 4819 | |
d914ba37 JF |
4820 | if (mask == TRACE_ITER_RECORD_TGID) { |
4821 | if (!tgid_map) | |
6ee40511 | 4822 | tgid_map = kvcalloc(PID_MAX_DEFAULT + 1, |
6396bb22 | 4823 | sizeof(*tgid_map), |
d914ba37 JF |
4824 | GFP_KERNEL); |
4825 | if (!tgid_map) { | |
4826 | tr->trace_flags &= ~TRACE_ITER_RECORD_TGID; | |
4827 | return -ENOMEM; | |
4828 | } | |
4829 | ||
4830 | trace_event_enable_tgid_record(enabled); | |
4831 | } | |
4832 | ||
c37775d5 SR |
4833 | if (mask == TRACE_ITER_EVENT_FORK) |
4834 | trace_event_follow_fork(tr, enabled); | |
4835 | ||
1e10486f NK |
4836 | if (mask == TRACE_ITER_FUNC_FORK) |
4837 | ftrace_pid_follow_fork(tr, enabled); | |
4838 | ||
80902822 | 4839 | if (mask == TRACE_ITER_OVERWRITE) { |
1c5eb448 | 4840 | ring_buffer_change_overwrite(tr->array_buffer.buffer, enabled); |
80902822 | 4841 | #ifdef CONFIG_TRACER_MAX_TRACE |
12883efb | 4842 | ring_buffer_change_overwrite(tr->max_buffer.buffer, enabled); |
80902822 SRRH |
4843 | #endif |
4844 | } | |
81698831 | 4845 | |
b9f9108c | 4846 | if (mask == TRACE_ITER_PRINTK) { |
81698831 | 4847 | trace_printk_start_stop_comm(enabled); |
b9f9108c SRRH |
4848 | trace_printk_control(enabled); |
4849 | } | |
613f04a0 SRRH |
4850 | |
4851 | return 0; | |
af4617bd SR |
4852 | } |
4853 | ||
9c5b9d3d | 4854 | int trace_set_options(struct trace_array *tr, char *option) |
bc0c38d1 | 4855 | { |
8d18eaaf | 4856 | char *cmp; |
bc0c38d1 | 4857 | int neg = 0; |
591a033d | 4858 | int ret; |
a4d1e688 | 4859 | size_t orig_len = strlen(option); |
3d739c1f | 4860 | int len; |
bc0c38d1 | 4861 | |
7bcfaf54 | 4862 | cmp = strstrip(option); |
bc0c38d1 | 4863 | |
3d739c1f SRV |
4864 | len = str_has_prefix(cmp, "no"); |
4865 | if (len) | |
bc0c38d1 | 4866 | neg = 1; |
3d739c1f SRV |
4867 | |
4868 | cmp += len; | |
bc0c38d1 | 4869 | |
3a53acf1 | 4870 | mutex_lock(&event_mutex); |
69d34da2 SRRH |
4871 | mutex_lock(&trace_types_lock); |
4872 | ||
591a033d | 4873 | ret = match_string(trace_options, -1, cmp); |
adf9f195 | 4874 | /* If no option could be set, test the specific tracer options */ |
591a033d | 4875 | if (ret < 0) |
8c1a49ae | 4876 | ret = set_tracer_option(tr, cmp, neg); |
591a033d YX |
4877 | else |
4878 | ret = set_tracer_flag(tr, 1 << ret, !neg); | |
69d34da2 SRRH |
4879 | |
4880 | mutex_unlock(&trace_types_lock); | |
3a53acf1 | 4881 | mutex_unlock(&event_mutex); |
bc0c38d1 | 4882 | |
a4d1e688 JW |
4883 | /* |
4884 | * If the first trailing whitespace is replaced with '\0' by strstrip, | |
4885 | * turn it back into a space. | |
4886 | */ | |
4887 | if (orig_len > strlen(option)) | |
4888 | option[strlen(option)] = ' '; | |
4889 | ||
7bcfaf54 SR |
4890 | return ret; |
4891 | } | |
4892 | ||
a4d1e688 JW |
4893 | static void __init apply_trace_boot_options(void) |
4894 | { | |
4895 | char *buf = trace_boot_options_buf; | |
4896 | char *option; | |
4897 | ||
4898 | while (true) { | |
4899 | option = strsep(&buf, ","); | |
4900 | ||
4901 | if (!option) | |
4902 | break; | |
a4d1e688 | 4903 | |
43ed3843 SRRH |
4904 | if (*option) |
4905 | trace_set_options(&global_trace, option); | |
a4d1e688 JW |
4906 | |
4907 | /* Put back the comma to allow this to be called again */ | |
4908 | if (buf) | |
4909 | *(buf - 1) = ','; | |
4910 | } | |
4911 | } | |
4912 | ||
7bcfaf54 SR |
4913 | static ssize_t |
4914 | tracing_trace_options_write(struct file *filp, const char __user *ubuf, | |
4915 | size_t cnt, loff_t *ppos) | |
4916 | { | |
2b6080f2 SR |
4917 | struct seq_file *m = filp->private_data; |
4918 | struct trace_array *tr = m->private; | |
7bcfaf54 | 4919 | char buf[64]; |
613f04a0 | 4920 | int ret; |
7bcfaf54 SR |
4921 | |
4922 | if (cnt >= sizeof(buf)) | |
4923 | return -EINVAL; | |
4924 | ||
4afe6495 | 4925 | if (copy_from_user(buf, ubuf, cnt)) |
7bcfaf54 SR |
4926 | return -EFAULT; |
4927 | ||
a8dd2176 SR |
4928 | buf[cnt] = 0; |
4929 | ||
2b6080f2 | 4930 | ret = trace_set_options(tr, buf); |
613f04a0 SRRH |
4931 | if (ret < 0) |
4932 | return ret; | |
7bcfaf54 | 4933 | |
cf8517cf | 4934 | *ppos += cnt; |
bc0c38d1 SR |
4935 | |
4936 | return cnt; | |
4937 | } | |
4938 | ||
fdb372ed LZ |
4939 | static int tracing_trace_options_open(struct inode *inode, struct file *file) |
4940 | { | |
7b85af63 | 4941 | struct trace_array *tr = inode->i_private; |
f77d09a3 | 4942 | int ret; |
7b85af63 | 4943 | |
8530dec6 SRV |
4944 | ret = tracing_check_open_get_tr(tr); |
4945 | if (ret) | |
4946 | return ret; | |
7b85af63 | 4947 | |
f77d09a3 AL |
4948 | ret = single_open(file, tracing_trace_options_show, inode->i_private); |
4949 | if (ret < 0) | |
4950 | trace_array_put(tr); | |
4951 | ||
4952 | return ret; | |
fdb372ed LZ |
4953 | } |
4954 | ||
5e2336a0 | 4955 | static const struct file_operations tracing_iter_fops = { |
fdb372ed LZ |
4956 | .open = tracing_trace_options_open, |
4957 | .read = seq_read, | |
4958 | .llseek = seq_lseek, | |
7b85af63 | 4959 | .release = tracing_single_release_tr, |
ee6bce52 | 4960 | .write = tracing_trace_options_write, |
bc0c38d1 SR |
4961 | }; |
4962 | ||
7bd2f24c IM |
4963 | static const char readme_msg[] = |
4964 | "tracing mini-HOWTO:\n\n" | |
22f45649 SRRH |
4965 | "# echo 0 > tracing_on : quick way to disable tracing\n" |
4966 | "# echo 1 > tracing_on : quick way to re-enable tracing\n\n" | |
4967 | " Important files:\n" | |
4968 | " trace\t\t\t- The static contents of the buffer\n" | |
4969 | "\t\t\t To clear the buffer write into this file: echo > trace\n" | |
4970 | " trace_pipe\t\t- A consuming read to see the contents of the buffer\n" | |
4971 | " current_tracer\t- function and latency tracers\n" | |
4972 | " available_tracers\t- list of configured tracers for current_tracer\n" | |
a8d65579 | 4973 | " error_log\t- error log for failed commands (that support it)\n" |
22f45649 SRRH |
4974 | " buffer_size_kb\t- view and modify size of per cpu buffer\n" |
4975 | " buffer_total_size_kb - view total size of all cpu buffers\n\n" | |
4976 | " trace_clock\t\t-change the clock used to order events\n" | |
4977 | " local: Per cpu clock but may not be synced across CPUs\n" | |
4978 | " global: Synced across CPUs but slows tracing down.\n" | |
4979 | " counter: Not a clock, but just an increment\n" | |
4980 | " uptime: Jiffy counter from time of boot\n" | |
4981 | " perf: Same clock that perf events use\n" | |
4982 | #ifdef CONFIG_X86_64 | |
4983 | " x86-tsc: TSC cycle counter\n" | |
4984 | #endif | |
2c1ea60b TZ |
4985 | "\n timestamp_mode\t-view the mode used to timestamp events\n" |
4986 | " delta: Delta difference against a buffer-wide timestamp\n" | |
4987 | " absolute: Absolute (standalone) timestamp\n" | |
22f45649 | 4988 | "\n trace_marker\t\t- Writes into this file writes into the kernel buffer\n" |
fa32e855 | 4989 | "\n trace_marker_raw\t\t- Writes into this file writes binary data into the kernel buffer\n" |
22f45649 SRRH |
4990 | " tracing_cpumask\t- Limit which CPUs to trace\n" |
4991 | " instances\t\t- Make sub-buffers with: mkdir instances/foo\n" | |
4992 | "\t\t\t Remove sub-buffer with rmdir\n" | |
4993 | " trace_options\t\t- Set format or modify how tracing happens\n" | |
b9416997 | 4994 | "\t\t\t Disable an option by prefixing 'no' to the\n" |
71485c45 | 4995 | "\t\t\t option name\n" |
939c7a4f | 4996 | " saved_cmdlines_size\t- echo command number in here to store comm-pid list\n" |
22f45649 SRRH |
4997 | #ifdef CONFIG_DYNAMIC_FTRACE |
4998 | "\n available_filter_functions - list of functions that can be filtered on\n" | |
71485c45 SRRH |
4999 | " set_ftrace_filter\t- echo function name in here to only trace these\n" |
5000 | "\t\t\t functions\n" | |
60f1d5e3 | 5001 | "\t accepts: func_full_name or glob-matching-pattern\n" |
71485c45 SRRH |
5002 | "\t modules: Can select a group via module\n" |
5003 | "\t Format: :mod:<module-name>\n" | |
5004 | "\t example: echo :mod:ext3 > set_ftrace_filter\n" | |
5005 | "\t triggers: a command to perform when function is hit\n" | |
5006 | "\t Format: <function>:<trigger>[:count]\n" | |
5007 | "\t trigger: traceon, traceoff\n" | |
5008 | "\t\t enable_event:<system>:<event>\n" | |
5009 | "\t\t disable_event:<system>:<event>\n" | |
22f45649 | 5010 | #ifdef CONFIG_STACKTRACE |
71485c45 | 5011 | "\t\t stacktrace\n" |
22f45649 SRRH |
5012 | #endif |
5013 | #ifdef CONFIG_TRACER_SNAPSHOT | |
71485c45 | 5014 | "\t\t snapshot\n" |
22f45649 | 5015 | #endif |
17a280ea SRRH |
5016 | "\t\t dump\n" |
5017 | "\t\t cpudump\n" | |
71485c45 SRRH |
5018 | "\t example: echo do_fault:traceoff > set_ftrace_filter\n" |
5019 | "\t echo do_trap:traceoff:3 > set_ftrace_filter\n" | |
5020 | "\t The first one will disable tracing every time do_fault is hit\n" | |
5021 | "\t The second will disable tracing at most 3 times when do_trap is hit\n" | |
5022 | "\t The first time do trap is hit and it disables tracing, the\n" | |
5023 | "\t counter will decrement to 2. If tracing is already disabled,\n" | |
5024 | "\t the counter will not decrement. It only decrements when the\n" | |
5025 | "\t trigger did work\n" | |
5026 | "\t To remove trigger without count:\n" | |
5027 | "\t echo '!<function>:<trigger> > set_ftrace_filter\n" | |
5028 | "\t To remove trigger with a count:\n" | |
5029 | "\t echo '!<function>:<trigger>:0 > set_ftrace_filter\n" | |
22f45649 | 5030 | " set_ftrace_notrace\t- echo function name in here to never trace.\n" |
71485c45 SRRH |
5031 | "\t accepts: func_full_name, *func_end, func_begin*, *func_middle*\n" |
5032 | "\t modules: Can select a group via module command :mod:\n" | |
5033 | "\t Does not accept triggers\n" | |
22f45649 SRRH |
5034 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
5035 | #ifdef CONFIG_FUNCTION_TRACER | |
71485c45 SRRH |
5036 | " set_ftrace_pid\t- Write pid(s) to only function trace those pids\n" |
5037 | "\t\t (function)\n" | |
b3b1e6ed SRV |
5038 | " set_ftrace_notrace_pid\t- Write pid(s) to not function trace those pids\n" |
5039 | "\t\t (function)\n" | |
22f45649 SRRH |
5040 | #endif |
5041 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
5042 | " set_graph_function\t- Trace the nested calls of a function (function_graph)\n" | |
d048a8c7 | 5043 | " set_graph_notrace\t- Do not trace the nested calls of a function (function_graph)\n" |
22f45649 SRRH |
5044 | " max_graph_depth\t- Trace a limited depth of nested calls (0 is unlimited)\n" |
5045 | #endif | |
5046 | #ifdef CONFIG_TRACER_SNAPSHOT | |
71485c45 SRRH |
5047 | "\n snapshot\t\t- Like 'trace' but shows the content of the static\n" |
5048 | "\t\t\t snapshot buffer. Read the contents for more\n" | |
5049 | "\t\t\t information\n" | |
22f45649 | 5050 | #endif |
991821c8 | 5051 | #ifdef CONFIG_STACK_TRACER |
22f45649 SRRH |
5052 | " stack_trace\t\t- Shows the max stack trace when active\n" |
5053 | " stack_max_size\t- Shows current max stack size that was traced\n" | |
71485c45 SRRH |
5054 | "\t\t\t Write into this file to reset the max size (trigger a\n" |
5055 | "\t\t\t new trace)\n" | |
22f45649 | 5056 | #ifdef CONFIG_DYNAMIC_FTRACE |
71485c45 SRRH |
5057 | " stack_trace_filter\t- Like set_ftrace_filter but limits what stack_trace\n" |
5058 | "\t\t\t traces\n" | |
22f45649 | 5059 | #endif |
991821c8 | 5060 | #endif /* CONFIG_STACK_TRACER */ |
5448d44c | 5061 | #ifdef CONFIG_DYNAMIC_EVENTS |
ca89bc07 | 5062 | " dynamic_events\t\t- Create/append/remove/show the generic dynamic events\n" |
5448d44c MH |
5063 | "\t\t\t Write into this file to define/undefine new trace events.\n" |
5064 | #endif | |
6b0b7551 | 5065 | #ifdef CONFIG_KPROBE_EVENTS |
ca89bc07 | 5066 | " kprobe_events\t\t- Create/append/remove/show the kernel dynamic events\n" |
86425625 MH |
5067 | "\t\t\t Write into this file to define/undefine new trace events.\n" |
5068 | #endif | |
6b0b7551 | 5069 | #ifdef CONFIG_UPROBE_EVENTS |
41af3cf5 | 5070 | " uprobe_events\t\t- Create/append/remove/show the userspace dynamic events\n" |
86425625 MH |
5071 | "\t\t\t Write into this file to define/undefine new trace events.\n" |
5072 | #endif | |
6b0b7551 | 5073 | #if defined(CONFIG_KPROBE_EVENTS) || defined(CONFIG_UPROBE_EVENTS) |
86425625 | 5074 | "\t accepts: event-definitions (one definition per line)\n" |
c3ca46ef MH |
5075 | "\t Format: p[:[<group>/]<event>] <place> [<args>]\n" |
5076 | "\t r[maxactive][:[<group>/]<event>] <place> [<args>]\n" | |
7bbab38d MH |
5077 | #ifdef CONFIG_HIST_TRIGGERS |
5078 | "\t s:[synthetic/]<event> <field> [<field>]\n" | |
5079 | #endif | |
86425625 | 5080 | "\t -:[<group>/]<event>\n" |
6b0b7551 | 5081 | #ifdef CONFIG_KPROBE_EVENTS |
86425625 | 5082 | "\t place: [<module>:]<symbol>[+<offset>]|<memaddr>\n" |
35b6f55a | 5083 | "place (kretprobe): [<module>:]<symbol>[+<offset>]|<memaddr>\n" |
86425625 | 5084 | #endif |
6b0b7551 | 5085 | #ifdef CONFIG_UPROBE_EVENTS |
1cc33161 | 5086 | " place (uprobe): <path>:<offset>[(ref_ctr_offset)]\n" |
86425625 MH |
5087 | #endif |
5088 | "\t args: <name>=fetcharg[:type]\n" | |
5089 | "\t fetcharg: %<register>, @<address>, @<symbol>[+|-<offset>],\n" | |
a1303af5 | 5090 | #ifdef CONFIG_HAVE_FUNCTION_ARG_ACCESS_API |
e65f7ae7 | 5091 | "\t $stack<index>, $stack, $retval, $comm, $arg<N>,\n" |
a1303af5 | 5092 | #else |
e65f7ae7 | 5093 | "\t $stack<index>, $stack, $retval, $comm,\n" |
a1303af5 | 5094 | #endif |
a42e3c4d | 5095 | "\t +|-[u]<offset>(<fetcharg>), \\imm-value, \\\"imm-string\"\n" |
60c2e0ce | 5096 | "\t type: s8/16/32/64, u8/16/32/64, x8/16/32/64, string, symbol,\n" |
88903c46 | 5097 | "\t b<bit-width>@<bit-offset>/<container-size>, ustring,\n" |
40b53b77 | 5098 | "\t <type>\\[<array-size>\\]\n" |
7bbab38d MH |
5099 | #ifdef CONFIG_HIST_TRIGGERS |
5100 | "\t field: <stype> <name>;\n" | |
5101 | "\t stype: u8/u16/u32/u64, s8/s16/s32/s64, pid_t,\n" | |
5102 | "\t [unsigned] char/int/long\n" | |
5103 | #endif | |
86425625 | 5104 | #endif |
26f25564 TZ |
5105 | " events/\t\t- Directory containing all trace event subsystems:\n" |
5106 | " enable\t\t- Write 0/1 to enable/disable tracing of all events\n" | |
5107 | " events/<system>/\t- Directory containing all trace events for <system>:\n" | |
71485c45 SRRH |
5108 | " enable\t\t- Write 0/1 to enable/disable tracing of all <system>\n" |
5109 | "\t\t\t events\n" | |
26f25564 | 5110 | " filter\t\t- If set, only events passing filter are traced\n" |
71485c45 SRRH |
5111 | " events/<system>/<event>/\t- Directory containing control files for\n" |
5112 | "\t\t\t <event>:\n" | |
26f25564 TZ |
5113 | " enable\t\t- Write 0/1 to enable/disable tracing of <event>\n" |
5114 | " filter\t\t- If set, only events passing filter are traced\n" | |
5115 | " trigger\t\t- If set, a command to perform when event is hit\n" | |
71485c45 SRRH |
5116 | "\t Format: <trigger>[:count][if <filter>]\n" |
5117 | "\t trigger: traceon, traceoff\n" | |
5118 | "\t enable_event:<system>:<event>\n" | |
5119 | "\t disable_event:<system>:<event>\n" | |
d0bad49b TZ |
5120 | #ifdef CONFIG_HIST_TRIGGERS |
5121 | "\t enable_hist:<system>:<event>\n" | |
5122 | "\t disable_hist:<system>:<event>\n" | |
5123 | #endif | |
26f25564 | 5124 | #ifdef CONFIG_STACKTRACE |
71485c45 | 5125 | "\t\t stacktrace\n" |
26f25564 TZ |
5126 | #endif |
5127 | #ifdef CONFIG_TRACER_SNAPSHOT | |
71485c45 | 5128 | "\t\t snapshot\n" |
7ef224d1 TZ |
5129 | #endif |
5130 | #ifdef CONFIG_HIST_TRIGGERS | |
5131 | "\t\t hist (see below)\n" | |
26f25564 | 5132 | #endif |
71485c45 SRRH |
5133 | "\t example: echo traceoff > events/block/block_unplug/trigger\n" |
5134 | "\t echo traceoff:3 > events/block/block_unplug/trigger\n" | |
5135 | "\t echo 'enable_event:kmem:kmalloc:3 if nr_rq > 1' > \\\n" | |
5136 | "\t events/block/block_unplug/trigger\n" | |
5137 | "\t The first disables tracing every time block_unplug is hit.\n" | |
5138 | "\t The second disables tracing the first 3 times block_unplug is hit.\n" | |
5139 | "\t The third enables the kmalloc event the first 3 times block_unplug\n" | |
5140 | "\t is hit and has value of greater than 1 for the 'nr_rq' event field.\n" | |
5141 | "\t Like function triggers, the counter is only decremented if it\n" | |
5142 | "\t enabled or disabled tracing.\n" | |
5143 | "\t To remove a trigger without a count:\n" | |
5144 | "\t echo '!<trigger> > <system>/<event>/trigger\n" | |
5145 | "\t To remove a trigger with a count:\n" | |
5146 | "\t echo '!<trigger>:0 > <system>/<event>/trigger\n" | |
5147 | "\t Filters can be ignored when removing a trigger.\n" | |
7ef224d1 TZ |
5148 | #ifdef CONFIG_HIST_TRIGGERS |
5149 | " hist trigger\t- If set, event hits are aggregated into a hash table\n" | |
76a3b0c8 | 5150 | "\t Format: hist:keys=<field1[,field2,...]>\n" |
f2606835 | 5151 | "\t [:values=<field1[,field2,...]>]\n" |
e62347d2 | 5152 | "\t [:sort=<field1[,field2,...]>]\n" |
7ef224d1 | 5153 | "\t [:size=#entries]\n" |
e86ae9ba | 5154 | "\t [:pause][:continue][:clear]\n" |
5463bfda | 5155 | "\t [:name=histname1]\n" |
c3e49506 | 5156 | "\t [:<handler>.<action>]\n" |
7ef224d1 TZ |
5157 | "\t [if <filter>]\n\n" |
5158 | "\t When a matching event is hit, an entry is added to a hash\n" | |
f2606835 TZ |
5159 | "\t table using the key(s) and value(s) named, and the value of a\n" |
5160 | "\t sum called 'hitcount' is incremented. Keys and values\n" | |
5161 | "\t correspond to fields in the event's format description. Keys\n" | |
69a0200c TZ |
5162 | "\t can be any field, or the special string 'stacktrace'.\n" |
5163 | "\t Compound keys consisting of up to two fields can be specified\n" | |
5164 | "\t by the 'keys' keyword. Values must correspond to numeric\n" | |
5165 | "\t fields. Sort keys consisting of up to two fields can be\n" | |
5166 | "\t specified using the 'sort' keyword. The sort direction can\n" | |
5167 | "\t be modified by appending '.descending' or '.ascending' to a\n" | |
5168 | "\t sort field. The 'size' parameter can be used to specify more\n" | |
5463bfda TZ |
5169 | "\t or fewer than the default 2048 entries for the hashtable size.\n" |
5170 | "\t If a hist trigger is given a name using the 'name' parameter,\n" | |
5171 | "\t its histogram data will be shared with other triggers of the\n" | |
5172 | "\t same name, and trigger hits will update this common data.\n\n" | |
7ef224d1 | 5173 | "\t Reading the 'hist' file for the event will dump the hash\n" |
52a7f16d TZ |
5174 | "\t table in its entirety to stdout. If there are multiple hist\n" |
5175 | "\t triggers attached to an event, there will be a table for each\n" | |
5463bfda TZ |
5176 | "\t trigger in the output. The table displayed for a named\n" |
5177 | "\t trigger will be the same as any other instance having the\n" | |
5178 | "\t same name. The default format used to display a given field\n" | |
5179 | "\t can be modified by appending any of the following modifiers\n" | |
5180 | "\t to the field name, as applicable:\n\n" | |
c6afad49 TZ |
5181 | "\t .hex display a number as a hex value\n" |
5182 | "\t .sym display an address as a symbol\n" | |
6b4827ad | 5183 | "\t .sym-offset display an address as a symbol and offset\n" |
31696198 | 5184 | "\t .execname display a common_pid as a program name\n" |
860f9f6b TZ |
5185 | "\t .syscall display a syscall id as a syscall name\n" |
5186 | "\t .log2 display log2 value rather than raw number\n" | |
5187 | "\t .usecs display a common_timestamp in microseconds\n\n" | |
83e99914 TZ |
5188 | "\t The 'pause' parameter can be used to pause an existing hist\n" |
5189 | "\t trigger or to start a hist trigger but not log any events\n" | |
5190 | "\t until told to do so. 'continue' can be used to start or\n" | |
5191 | "\t restart a paused hist trigger.\n\n" | |
e86ae9ba TZ |
5192 | "\t The 'clear' parameter will clear the contents of a running\n" |
5193 | "\t hist trigger and leave its current paused/active state\n" | |
5194 | "\t unchanged.\n\n" | |
d0bad49b TZ |
5195 | "\t The enable_hist and disable_hist triggers can be used to\n" |
5196 | "\t have one event conditionally start and stop another event's\n" | |
9e5a36a3 | 5197 | "\t already-attached hist trigger. The syntax is analogous to\n" |
c3e49506 TZ |
5198 | "\t the enable_event and disable_event triggers.\n\n" |
5199 | "\t Hist trigger handlers and actions are executed whenever a\n" | |
5200 | "\t a histogram entry is added or updated. They take the form:\n\n" | |
5201 | "\t <handler>.<action>\n\n" | |
5202 | "\t The available handlers are:\n\n" | |
5203 | "\t onmatch(matching.event) - invoke on addition or update\n" | |
dff81f55 TZ |
5204 | "\t onmax(var) - invoke if var exceeds current max\n" |
5205 | "\t onchange(var) - invoke action if var changes\n\n" | |
c3e49506 | 5206 | "\t The available actions are:\n\n" |
e91eefd7 | 5207 | "\t trace(<synthetic_event>,param list) - generate synthetic event\n" |
c3e49506 | 5208 | "\t save(field,...) - save current event fields\n" |
a3785b7e TZ |
5209 | #ifdef CONFIG_TRACER_SNAPSHOT |
5210 | "\t snapshot() - snapshot the trace buffer\n" | |
5211 | #endif | |
7ef224d1 | 5212 | #endif |
7bd2f24c IM |
5213 | ; |
5214 | ||
5215 | static ssize_t | |
5216 | tracing_readme_read(struct file *filp, char __user *ubuf, | |
5217 | size_t cnt, loff_t *ppos) | |
5218 | { | |
5219 | return simple_read_from_buffer(ubuf, cnt, ppos, | |
5220 | readme_msg, strlen(readme_msg)); | |
5221 | } | |
5222 | ||
5e2336a0 | 5223 | static const struct file_operations tracing_readme_fops = { |
c7078de1 IM |
5224 | .open = tracing_open_generic, |
5225 | .read = tracing_readme_read, | |
b444786f | 5226 | .llseek = generic_file_llseek, |
7bd2f24c IM |
5227 | }; |
5228 | ||
99c621d7 MS |
5229 | static void *saved_tgids_next(struct seq_file *m, void *v, loff_t *pos) |
5230 | { | |
5231 | int *ptr = v; | |
5232 | ||
5233 | if (*pos || m->count) | |
5234 | ptr++; | |
5235 | ||
5236 | (*pos)++; | |
5237 | ||
5238 | for (; ptr <= &tgid_map[PID_MAX_DEFAULT]; ptr++) { | |
5239 | if (trace_find_tgid(*ptr)) | |
5240 | return ptr; | |
5241 | } | |
5242 | ||
5243 | return NULL; | |
5244 | } | |
5245 | ||
5246 | static void *saved_tgids_start(struct seq_file *m, loff_t *pos) | |
5247 | { | |
5248 | void *v; | |
5249 | loff_t l = 0; | |
5250 | ||
5251 | if (!tgid_map) | |
5252 | return NULL; | |
5253 | ||
5254 | v = &tgid_map[0]; | |
5255 | while (l <= *pos) { | |
5256 | v = saved_tgids_next(m, v, &l); | |
5257 | if (!v) | |
5258 | return NULL; | |
5259 | } | |
5260 | ||
5261 | return v; | |
5262 | } | |
5263 | ||
5264 | static void saved_tgids_stop(struct seq_file *m, void *v) | |
5265 | { | |
5266 | } | |
5267 | ||
5268 | static int saved_tgids_show(struct seq_file *m, void *v) | |
5269 | { | |
5270 | int pid = (int *)v - tgid_map; | |
5271 | ||
5272 | seq_printf(m, "%d %d\n", pid, trace_find_tgid(pid)); | |
5273 | return 0; | |
5274 | } | |
5275 | ||
5276 | static const struct seq_operations tracing_saved_tgids_seq_ops = { | |
5277 | .start = saved_tgids_start, | |
5278 | .stop = saved_tgids_stop, | |
5279 | .next = saved_tgids_next, | |
5280 | .show = saved_tgids_show, | |
5281 | }; | |
5282 | ||
5283 | static int tracing_saved_tgids_open(struct inode *inode, struct file *filp) | |
5284 | { | |
8530dec6 SRV |
5285 | int ret; |
5286 | ||
5287 | ret = tracing_check_open_get_tr(NULL); | |
5288 | if (ret) | |
5289 | return ret; | |
99c621d7 MS |
5290 | |
5291 | return seq_open(filp, &tracing_saved_tgids_seq_ops); | |
5292 | } | |
5293 | ||
5294 | ||
5295 | static const struct file_operations tracing_saved_tgids_fops = { | |
5296 | .open = tracing_saved_tgids_open, | |
5297 | .read = seq_read, | |
5298 | .llseek = seq_lseek, | |
5299 | .release = seq_release, | |
5300 | }; | |
5301 | ||
42584c81 YY |
5302 | static void *saved_cmdlines_next(struct seq_file *m, void *v, loff_t *pos) |
5303 | { | |
5304 | unsigned int *ptr = v; | |
69abe6a5 | 5305 | |
42584c81 YY |
5306 | if (*pos || m->count) |
5307 | ptr++; | |
69abe6a5 | 5308 | |
42584c81 | 5309 | (*pos)++; |
69abe6a5 | 5310 | |
939c7a4f YY |
5311 | for (; ptr < &savedcmd->map_cmdline_to_pid[savedcmd->cmdline_num]; |
5312 | ptr++) { | |
42584c81 YY |
5313 | if (*ptr == -1 || *ptr == NO_CMDLINE_MAP) |
5314 | continue; | |
69abe6a5 | 5315 | |
42584c81 YY |
5316 | return ptr; |
5317 | } | |
69abe6a5 | 5318 | |
42584c81 YY |
5319 | return NULL; |
5320 | } | |
5321 | ||
5322 | static void *saved_cmdlines_start(struct seq_file *m, loff_t *pos) | |
5323 | { | |
5324 | void *v; | |
5325 | loff_t l = 0; | |
69abe6a5 | 5326 | |
4c27e756 SRRH |
5327 | preempt_disable(); |
5328 | arch_spin_lock(&trace_cmdline_lock); | |
5329 | ||
939c7a4f | 5330 | v = &savedcmd->map_cmdline_to_pid[0]; |
42584c81 YY |
5331 | while (l <= *pos) { |
5332 | v = saved_cmdlines_next(m, v, &l); | |
5333 | if (!v) | |
5334 | return NULL; | |
69abe6a5 AP |
5335 | } |
5336 | ||
42584c81 YY |
5337 | return v; |
5338 | } | |
5339 | ||
5340 | static void saved_cmdlines_stop(struct seq_file *m, void *v) | |
5341 | { | |
4c27e756 SRRH |
5342 | arch_spin_unlock(&trace_cmdline_lock); |
5343 | preempt_enable(); | |
42584c81 | 5344 | } |
69abe6a5 | 5345 | |
42584c81 YY |
5346 | static int saved_cmdlines_show(struct seq_file *m, void *v) |
5347 | { | |
5348 | char buf[TASK_COMM_LEN]; | |
5349 | unsigned int *pid = v; | |
69abe6a5 | 5350 | |
4c27e756 | 5351 | __trace_find_cmdline(*pid, buf); |
42584c81 YY |
5352 | seq_printf(m, "%d %s\n", *pid, buf); |
5353 | return 0; | |
5354 | } | |
5355 | ||
5356 | static const struct seq_operations tracing_saved_cmdlines_seq_ops = { | |
5357 | .start = saved_cmdlines_start, | |
5358 | .next = saved_cmdlines_next, | |
5359 | .stop = saved_cmdlines_stop, | |
5360 | .show = saved_cmdlines_show, | |
5361 | }; | |
5362 | ||
5363 | static int tracing_saved_cmdlines_open(struct inode *inode, struct file *filp) | |
5364 | { | |
8530dec6 SRV |
5365 | int ret; |
5366 | ||
5367 | ret = tracing_check_open_get_tr(NULL); | |
5368 | if (ret) | |
5369 | return ret; | |
42584c81 YY |
5370 | |
5371 | return seq_open(filp, &tracing_saved_cmdlines_seq_ops); | |
69abe6a5 AP |
5372 | } |
5373 | ||
5374 | static const struct file_operations tracing_saved_cmdlines_fops = { | |
42584c81 YY |
5375 | .open = tracing_saved_cmdlines_open, |
5376 | .read = seq_read, | |
5377 | .llseek = seq_lseek, | |
5378 | .release = seq_release, | |
69abe6a5 AP |
5379 | }; |
5380 | ||
939c7a4f YY |
5381 | static ssize_t |
5382 | tracing_saved_cmdlines_size_read(struct file *filp, char __user *ubuf, | |
5383 | size_t cnt, loff_t *ppos) | |
5384 | { | |
5385 | char buf[64]; | |
5386 | int r; | |
5387 | ||
5388 | arch_spin_lock(&trace_cmdline_lock); | |
a6af8fbf | 5389 | r = scnprintf(buf, sizeof(buf), "%u\n", savedcmd->cmdline_num); |
939c7a4f YY |
5390 | arch_spin_unlock(&trace_cmdline_lock); |
5391 | ||
5392 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
5393 | } | |
5394 | ||
5395 | static void free_saved_cmdlines_buffer(struct saved_cmdlines_buffer *s) | |
5396 | { | |
5397 | kfree(s->saved_cmdlines); | |
5398 | kfree(s->map_cmdline_to_pid); | |
5399 | kfree(s); | |
5400 | } | |
5401 | ||
5402 | static int tracing_resize_saved_cmdlines(unsigned int val) | |
5403 | { | |
5404 | struct saved_cmdlines_buffer *s, *savedcmd_temp; | |
5405 | ||
a6af8fbf | 5406 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
939c7a4f YY |
5407 | if (!s) |
5408 | return -ENOMEM; | |
5409 | ||
5410 | if (allocate_cmdlines_buffer(val, s) < 0) { | |
5411 | kfree(s); | |
5412 | return -ENOMEM; | |
5413 | } | |
5414 | ||
5415 | arch_spin_lock(&trace_cmdline_lock); | |
5416 | savedcmd_temp = savedcmd; | |
5417 | savedcmd = s; | |
5418 | arch_spin_unlock(&trace_cmdline_lock); | |
5419 | free_saved_cmdlines_buffer(savedcmd_temp); | |
5420 | ||
5421 | return 0; | |
5422 | } | |
5423 | ||
5424 | static ssize_t | |
5425 | tracing_saved_cmdlines_size_write(struct file *filp, const char __user *ubuf, | |
5426 | size_t cnt, loff_t *ppos) | |
5427 | { | |
5428 | unsigned long val; | |
5429 | int ret; | |
5430 | ||
5431 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); | |
5432 | if (ret) | |
5433 | return ret; | |
5434 | ||
5435 | /* must have at least 1 entry or less than PID_MAX_DEFAULT */ | |
5436 | if (!val || val > PID_MAX_DEFAULT) | |
5437 | return -EINVAL; | |
5438 | ||
5439 | ret = tracing_resize_saved_cmdlines((unsigned int)val); | |
5440 | if (ret < 0) | |
5441 | return ret; | |
5442 | ||
5443 | *ppos += cnt; | |
5444 | ||
5445 | return cnt; | |
5446 | } | |
5447 | ||
5448 | static const struct file_operations tracing_saved_cmdlines_size_fops = { | |
5449 | .open = tracing_open_generic, | |
5450 | .read = tracing_saved_cmdlines_size_read, | |
5451 | .write = tracing_saved_cmdlines_size_write, | |
5452 | }; | |
5453 | ||
681bec03 | 5454 | #ifdef CONFIG_TRACE_EVAL_MAP_FILE |
23bf8cb8 | 5455 | static union trace_eval_map_item * |
f57a4143 | 5456 | update_eval_map(union trace_eval_map_item *ptr) |
9828413d | 5457 | { |
00f4b652 | 5458 | if (!ptr->map.eval_string) { |
9828413d SRRH |
5459 | if (ptr->tail.next) { |
5460 | ptr = ptr->tail.next; | |
5461 | /* Set ptr to the next real item (skip head) */ | |
5462 | ptr++; | |
5463 | } else | |
5464 | return NULL; | |
5465 | } | |
5466 | return ptr; | |
5467 | } | |
5468 | ||
f57a4143 | 5469 | static void *eval_map_next(struct seq_file *m, void *v, loff_t *pos) |
9828413d | 5470 | { |
23bf8cb8 | 5471 | union trace_eval_map_item *ptr = v; |
9828413d SRRH |
5472 | |
5473 | /* | |
5474 | * Paranoid! If ptr points to end, we don't want to increment past it. | |
5475 | * This really should never happen. | |
5476 | */ | |
039958a5 | 5477 | (*pos)++; |
f57a4143 | 5478 | ptr = update_eval_map(ptr); |
9828413d SRRH |
5479 | if (WARN_ON_ONCE(!ptr)) |
5480 | return NULL; | |
5481 | ||
5482 | ptr++; | |
f57a4143 | 5483 | ptr = update_eval_map(ptr); |
9828413d SRRH |
5484 | |
5485 | return ptr; | |
5486 | } | |
5487 | ||
f57a4143 | 5488 | static void *eval_map_start(struct seq_file *m, loff_t *pos) |
9828413d | 5489 | { |
23bf8cb8 | 5490 | union trace_eval_map_item *v; |
9828413d SRRH |
5491 | loff_t l = 0; |
5492 | ||
1793ed93 | 5493 | mutex_lock(&trace_eval_mutex); |
9828413d | 5494 | |
23bf8cb8 | 5495 | v = trace_eval_maps; |
9828413d SRRH |
5496 | if (v) |
5497 | v++; | |
5498 | ||
5499 | while (v && l < *pos) { | |
f57a4143 | 5500 | v = eval_map_next(m, v, &l); |
9828413d SRRH |
5501 | } |
5502 | ||
5503 | return v; | |
5504 | } | |
5505 | ||
f57a4143 | 5506 | static void eval_map_stop(struct seq_file *m, void *v) |
9828413d | 5507 | { |
1793ed93 | 5508 | mutex_unlock(&trace_eval_mutex); |
9828413d SRRH |
5509 | } |
5510 | ||
f57a4143 | 5511 | static int eval_map_show(struct seq_file *m, void *v) |
9828413d | 5512 | { |
23bf8cb8 | 5513 | union trace_eval_map_item *ptr = v; |
9828413d SRRH |
5514 | |
5515 | seq_printf(m, "%s %ld (%s)\n", | |
00f4b652 | 5516 | ptr->map.eval_string, ptr->map.eval_value, |
9828413d SRRH |
5517 | ptr->map.system); |
5518 | ||
5519 | return 0; | |
5520 | } | |
5521 | ||
f57a4143 JL |
5522 | static const struct seq_operations tracing_eval_map_seq_ops = { |
5523 | .start = eval_map_start, | |
5524 | .next = eval_map_next, | |
5525 | .stop = eval_map_stop, | |
5526 | .show = eval_map_show, | |
9828413d SRRH |
5527 | }; |
5528 | ||
f57a4143 | 5529 | static int tracing_eval_map_open(struct inode *inode, struct file *filp) |
9828413d | 5530 | { |
8530dec6 SRV |
5531 | int ret; |
5532 | ||
5533 | ret = tracing_check_open_get_tr(NULL); | |
5534 | if (ret) | |
5535 | return ret; | |
9828413d | 5536 | |
f57a4143 | 5537 | return seq_open(filp, &tracing_eval_map_seq_ops); |
9828413d SRRH |
5538 | } |
5539 | ||
f57a4143 JL |
5540 | static const struct file_operations tracing_eval_map_fops = { |
5541 | .open = tracing_eval_map_open, | |
9828413d SRRH |
5542 | .read = seq_read, |
5543 | .llseek = seq_lseek, | |
5544 | .release = seq_release, | |
5545 | }; | |
5546 | ||
23bf8cb8 | 5547 | static inline union trace_eval_map_item * |
5f60b351 | 5548 | trace_eval_jmp_to_tail(union trace_eval_map_item *ptr) |
9828413d SRRH |
5549 | { |
5550 | /* Return tail of array given the head */ | |
5551 | return ptr + ptr->head.length + 1; | |
5552 | } | |
5553 | ||
5554 | static void | |
f57a4143 | 5555 | trace_insert_eval_map_file(struct module *mod, struct trace_eval_map **start, |
9828413d SRRH |
5556 | int len) |
5557 | { | |
00f4b652 JL |
5558 | struct trace_eval_map **stop; |
5559 | struct trace_eval_map **map; | |
23bf8cb8 JL |
5560 | union trace_eval_map_item *map_array; |
5561 | union trace_eval_map_item *ptr; | |
9828413d SRRH |
5562 | |
5563 | stop = start + len; | |
5564 | ||
5565 | /* | |
23bf8cb8 | 5566 | * The trace_eval_maps contains the map plus a head and tail item, |
9828413d SRRH |
5567 | * where the head holds the module and length of array, and the |
5568 | * tail holds a pointer to the next list. | |
5569 | */ | |
6da2ec56 | 5570 | map_array = kmalloc_array(len + 2, sizeof(*map_array), GFP_KERNEL); |
9828413d | 5571 | if (!map_array) { |
f57a4143 | 5572 | pr_warn("Unable to allocate trace eval mapping\n"); |
9828413d SRRH |
5573 | return; |
5574 | } | |
5575 | ||
1793ed93 | 5576 | mutex_lock(&trace_eval_mutex); |
9828413d | 5577 | |
23bf8cb8 JL |
5578 | if (!trace_eval_maps) |
5579 | trace_eval_maps = map_array; | |
9828413d | 5580 | else { |
23bf8cb8 | 5581 | ptr = trace_eval_maps; |
9828413d | 5582 | for (;;) { |
5f60b351 | 5583 | ptr = trace_eval_jmp_to_tail(ptr); |
9828413d SRRH |
5584 | if (!ptr->tail.next) |
5585 | break; | |
5586 | ptr = ptr->tail.next; | |
5587 | ||
5588 | } | |
5589 | ptr->tail.next = map_array; | |
5590 | } | |
5591 | map_array->head.mod = mod; | |
5592 | map_array->head.length = len; | |
5593 | map_array++; | |
5594 | ||
5595 | for (map = start; (unsigned long)map < (unsigned long)stop; map++) { | |
5596 | map_array->map = **map; | |
5597 | map_array++; | |
5598 | } | |
5599 | memset(map_array, 0, sizeof(*map_array)); | |
5600 | ||
1793ed93 | 5601 | mutex_unlock(&trace_eval_mutex); |
9828413d SRRH |
5602 | } |
5603 | ||
f57a4143 | 5604 | static void trace_create_eval_file(struct dentry *d_tracer) |
9828413d | 5605 | { |
681bec03 | 5606 | trace_create_file("eval_map", 0444, d_tracer, |
f57a4143 | 5607 | NULL, &tracing_eval_map_fops); |
9828413d SRRH |
5608 | } |
5609 | ||
681bec03 | 5610 | #else /* CONFIG_TRACE_EVAL_MAP_FILE */ |
f57a4143 JL |
5611 | static inline void trace_create_eval_file(struct dentry *d_tracer) { } |
5612 | static inline void trace_insert_eval_map_file(struct module *mod, | |
00f4b652 | 5613 | struct trace_eval_map **start, int len) { } |
681bec03 | 5614 | #endif /* !CONFIG_TRACE_EVAL_MAP_FILE */ |
9828413d | 5615 | |
f57a4143 | 5616 | static void trace_insert_eval_map(struct module *mod, |
00f4b652 | 5617 | struct trace_eval_map **start, int len) |
0c564a53 | 5618 | { |
00f4b652 | 5619 | struct trace_eval_map **map; |
0c564a53 SRRH |
5620 | |
5621 | if (len <= 0) | |
5622 | return; | |
5623 | ||
5624 | map = start; | |
5625 | ||
f57a4143 | 5626 | trace_event_eval_update(map, len); |
9828413d | 5627 | |
f57a4143 | 5628 | trace_insert_eval_map_file(mod, start, len); |
0c564a53 SRRH |
5629 | } |
5630 | ||
bc0c38d1 SR |
5631 | static ssize_t |
5632 | tracing_set_trace_read(struct file *filp, char __user *ubuf, | |
5633 | size_t cnt, loff_t *ppos) | |
5634 | { | |
2b6080f2 | 5635 | struct trace_array *tr = filp->private_data; |
ee6c2c1b | 5636 | char buf[MAX_TRACER_SIZE+2]; |
bc0c38d1 SR |
5637 | int r; |
5638 | ||
5639 | mutex_lock(&trace_types_lock); | |
2b6080f2 | 5640 | r = sprintf(buf, "%s\n", tr->current_trace->name); |
bc0c38d1 SR |
5641 | mutex_unlock(&trace_types_lock); |
5642 | ||
4bf39a94 | 5643 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
5644 | } |
5645 | ||
b6f11df2 ACM |
5646 | int tracer_init(struct tracer *t, struct trace_array *tr) |
5647 | { | |
1c5eb448 | 5648 | tracing_reset_online_cpus(&tr->array_buffer); |
b6f11df2 ACM |
5649 | return t->init(tr); |
5650 | } | |
5651 | ||
1c5eb448 | 5652 | static void set_buffer_entries(struct array_buffer *buf, unsigned long val) |
438ced17 VN |
5653 | { |
5654 | int cpu; | |
737223fb | 5655 | |
438ced17 | 5656 | for_each_tracing_cpu(cpu) |
12883efb | 5657 | per_cpu_ptr(buf->data, cpu)->entries = val; |
438ced17 VN |
5658 | } |
5659 | ||
12883efb | 5660 | #ifdef CONFIG_TRACER_MAX_TRACE |
d60da506 | 5661 | /* resize @tr's buffer to the size of @size_tr's entries */ |
1c5eb448 SRV |
5662 | static int resize_buffer_duplicate_size(struct array_buffer *trace_buf, |
5663 | struct array_buffer *size_buf, int cpu_id) | |
d60da506 HT |
5664 | { |
5665 | int cpu, ret = 0; | |
5666 | ||
5667 | if (cpu_id == RING_BUFFER_ALL_CPUS) { | |
5668 | for_each_tracing_cpu(cpu) { | |
12883efb SRRH |
5669 | ret = ring_buffer_resize(trace_buf->buffer, |
5670 | per_cpu_ptr(size_buf->data, cpu)->entries, cpu); | |
d60da506 HT |
5671 | if (ret < 0) |
5672 | break; | |
12883efb SRRH |
5673 | per_cpu_ptr(trace_buf->data, cpu)->entries = |
5674 | per_cpu_ptr(size_buf->data, cpu)->entries; | |
d60da506 HT |
5675 | } |
5676 | } else { | |
12883efb SRRH |
5677 | ret = ring_buffer_resize(trace_buf->buffer, |
5678 | per_cpu_ptr(size_buf->data, cpu_id)->entries, cpu_id); | |
d60da506 | 5679 | if (ret == 0) |
12883efb SRRH |
5680 | per_cpu_ptr(trace_buf->data, cpu_id)->entries = |
5681 | per_cpu_ptr(size_buf->data, cpu_id)->entries; | |
d60da506 HT |
5682 | } |
5683 | ||
5684 | return ret; | |
5685 | } | |
12883efb | 5686 | #endif /* CONFIG_TRACER_MAX_TRACE */ |
d60da506 | 5687 | |
2b6080f2 SR |
5688 | static int __tracing_resize_ring_buffer(struct trace_array *tr, |
5689 | unsigned long size, int cpu) | |
73c5162a SR |
5690 | { |
5691 | int ret; | |
5692 | ||
5693 | /* | |
5694 | * If kernel or user changes the size of the ring buffer | |
a123c52b SR |
5695 | * we use the size that was given, and we can forget about |
5696 | * expanding it later. | |
73c5162a | 5697 | */ |
55034cd6 | 5698 | ring_buffer_expanded = true; |
73c5162a | 5699 | |
b382ede6 | 5700 | /* May be called before buffers are initialized */ |
1c5eb448 | 5701 | if (!tr->array_buffer.buffer) |
b382ede6 SR |
5702 | return 0; |
5703 | ||
1c5eb448 | 5704 | ret = ring_buffer_resize(tr->array_buffer.buffer, size, cpu); |
73c5162a SR |
5705 | if (ret < 0) |
5706 | return ret; | |
5707 | ||
12883efb | 5708 | #ifdef CONFIG_TRACER_MAX_TRACE |
2b6080f2 SR |
5709 | if (!(tr->flags & TRACE_ARRAY_FL_GLOBAL) || |
5710 | !tr->current_trace->use_max_tr) | |
ef710e10 KM |
5711 | goto out; |
5712 | ||
12883efb | 5713 | ret = ring_buffer_resize(tr->max_buffer.buffer, size, cpu); |
73c5162a | 5714 | if (ret < 0) { |
1c5eb448 SRV |
5715 | int r = resize_buffer_duplicate_size(&tr->array_buffer, |
5716 | &tr->array_buffer, cpu); | |
73c5162a | 5717 | if (r < 0) { |
a123c52b SR |
5718 | /* |
5719 | * AARGH! We are left with different | |
5720 | * size max buffer!!!! | |
5721 | * The max buffer is our "snapshot" buffer. | |
5722 | * When a tracer needs a snapshot (one of the | |
5723 | * latency tracers), it swaps the max buffer | |
5724 | * with the saved snap shot. We succeeded to | |
5725 | * update the size of the main buffer, but failed to | |
5726 | * update the size of the max buffer. But when we tried | |
5727 | * to reset the main buffer to the original size, we | |
5728 | * failed there too. This is very unlikely to | |
5729 | * happen, but if it does, warn and kill all | |
5730 | * tracing. | |
5731 | */ | |
73c5162a SR |
5732 | WARN_ON(1); |
5733 | tracing_disabled = 1; | |
5734 | } | |
5735 | return ret; | |
5736 | } | |
5737 | ||
438ced17 | 5738 | if (cpu == RING_BUFFER_ALL_CPUS) |
12883efb | 5739 | set_buffer_entries(&tr->max_buffer, size); |
438ced17 | 5740 | else |
12883efb | 5741 | per_cpu_ptr(tr->max_buffer.data, cpu)->entries = size; |
438ced17 | 5742 | |
ef710e10 | 5743 | out: |
12883efb SRRH |
5744 | #endif /* CONFIG_TRACER_MAX_TRACE */ |
5745 | ||
438ced17 | 5746 | if (cpu == RING_BUFFER_ALL_CPUS) |
1c5eb448 | 5747 | set_buffer_entries(&tr->array_buffer, size); |
438ced17 | 5748 | else |
1c5eb448 | 5749 | per_cpu_ptr(tr->array_buffer.data, cpu)->entries = size; |
73c5162a SR |
5750 | |
5751 | return ret; | |
5752 | } | |
5753 | ||
9c5b9d3d MH |
5754 | ssize_t tracing_resize_ring_buffer(struct trace_array *tr, |
5755 | unsigned long size, int cpu_id) | |
4f271a2a | 5756 | { |
83f40318 | 5757 | int ret = size; |
4f271a2a VN |
5758 | |
5759 | mutex_lock(&trace_types_lock); | |
5760 | ||
438ced17 VN |
5761 | if (cpu_id != RING_BUFFER_ALL_CPUS) { |
5762 | /* make sure, this cpu is enabled in the mask */ | |
5763 | if (!cpumask_test_cpu(cpu_id, tracing_buffer_mask)) { | |
5764 | ret = -EINVAL; | |
5765 | goto out; | |
5766 | } | |
5767 | } | |
4f271a2a | 5768 | |
2b6080f2 | 5769 | ret = __tracing_resize_ring_buffer(tr, size, cpu_id); |
4f271a2a VN |
5770 | if (ret < 0) |
5771 | ret = -ENOMEM; | |
5772 | ||
438ced17 | 5773 | out: |
4f271a2a VN |
5774 | mutex_unlock(&trace_types_lock); |
5775 | ||
5776 | return ret; | |
5777 | } | |
5778 | ||
ef710e10 | 5779 | |
1852fcce SR |
5780 | /** |
5781 | * tracing_update_buffers - used by tracing facility to expand ring buffers | |
5782 | * | |
5783 | * To save on memory when the tracing is never used on a system with it | |
5784 | * configured in. The ring buffers are set to a minimum size. But once | |
5785 | * a user starts to use the tracing facility, then they need to grow | |
5786 | * to their default size. | |
5787 | * | |
5788 | * This function is to be called when a tracer is about to be used. | |
5789 | */ | |
5790 | int tracing_update_buffers(void) | |
5791 | { | |
5792 | int ret = 0; | |
5793 | ||
1027fcb2 | 5794 | mutex_lock(&trace_types_lock); |
1852fcce | 5795 | if (!ring_buffer_expanded) |
2b6080f2 | 5796 | ret = __tracing_resize_ring_buffer(&global_trace, trace_buf_size, |
438ced17 | 5797 | RING_BUFFER_ALL_CPUS); |
1027fcb2 | 5798 | mutex_unlock(&trace_types_lock); |
1852fcce SR |
5799 | |
5800 | return ret; | |
5801 | } | |
5802 | ||
577b785f SR |
5803 | struct trace_option_dentry; |
5804 | ||
37aea98b | 5805 | static void |
2b6080f2 | 5806 | create_trace_option_files(struct trace_array *tr, struct tracer *tracer); |
577b785f | 5807 | |
6b450d25 SRRH |
5808 | /* |
5809 | * Used to clear out the tracer before deletion of an instance. | |
5810 | * Must have trace_types_lock held. | |
5811 | */ | |
5812 | static void tracing_set_nop(struct trace_array *tr) | |
5813 | { | |
5814 | if (tr->current_trace == &nop_trace) | |
5815 | return; | |
5816 | ||
50512ab5 | 5817 | tr->current_trace->enabled--; |
6b450d25 SRRH |
5818 | |
5819 | if (tr->current_trace->reset) | |
5820 | tr->current_trace->reset(tr); | |
5821 | ||
5822 | tr->current_trace = &nop_trace; | |
5823 | } | |
5824 | ||
41d9c0be | 5825 | static void add_tracer_options(struct trace_array *tr, struct tracer *t) |
bc0c38d1 | 5826 | { |
09d23a1d SRRH |
5827 | /* Only enable if the directory has been created already. */ |
5828 | if (!tr->dir) | |
5829 | return; | |
5830 | ||
37aea98b | 5831 | create_trace_option_files(tr, t); |
09d23a1d SRRH |
5832 | } |
5833 | ||
9c5b9d3d | 5834 | int tracing_set_tracer(struct trace_array *tr, const char *buf) |
09d23a1d | 5835 | { |
bc0c38d1 | 5836 | struct tracer *t; |
12883efb | 5837 | #ifdef CONFIG_TRACER_MAX_TRACE |
34600f0e | 5838 | bool had_max_tr; |
12883efb | 5839 | #endif |
d9e54076 | 5840 | int ret = 0; |
bc0c38d1 | 5841 | |
1027fcb2 SR |
5842 | mutex_lock(&trace_types_lock); |
5843 | ||
73c5162a | 5844 | if (!ring_buffer_expanded) { |
2b6080f2 | 5845 | ret = __tracing_resize_ring_buffer(tr, trace_buf_size, |
438ced17 | 5846 | RING_BUFFER_ALL_CPUS); |
73c5162a | 5847 | if (ret < 0) |
59f586db | 5848 | goto out; |
73c5162a SR |
5849 | ret = 0; |
5850 | } | |
5851 | ||
bc0c38d1 SR |
5852 | for (t = trace_types; t; t = t->next) { |
5853 | if (strcmp(t->name, buf) == 0) | |
5854 | break; | |
5855 | } | |
c2931e05 FW |
5856 | if (!t) { |
5857 | ret = -EINVAL; | |
5858 | goto out; | |
5859 | } | |
2b6080f2 | 5860 | if (t == tr->current_trace) |
bc0c38d1 SR |
5861 | goto out; |
5862 | ||
a35873a0 TZ |
5863 | #ifdef CONFIG_TRACER_SNAPSHOT |
5864 | if (t->use_max_tr) { | |
5865 | arch_spin_lock(&tr->max_lock); | |
5866 | if (tr->cond_snapshot) | |
5867 | ret = -EBUSY; | |
5868 | arch_spin_unlock(&tr->max_lock); | |
5869 | if (ret) | |
5870 | goto out; | |
5871 | } | |
5872 | #endif | |
c7b3ae0b ZSZ |
5873 | /* Some tracers won't work on kernel command line */ |
5874 | if (system_state < SYSTEM_RUNNING && t->noboot) { | |
5875 | pr_warn("Tracer '%s' is not allowed on command line, ignored\n", | |
5876 | t->name); | |
5877 | goto out; | |
5878 | } | |
5879 | ||
607e2ea1 SRRH |
5880 | /* Some tracers are only allowed for the top level buffer */ |
5881 | if (!trace_ok_for_array(t, tr)) { | |
5882 | ret = -EINVAL; | |
5883 | goto out; | |
5884 | } | |
5885 | ||
cf6ab6d9 SRRH |
5886 | /* If trace pipe files are being read, we can't change the tracer */ |
5887 | if (tr->current_trace->ref) { | |
5888 | ret = -EBUSY; | |
5889 | goto out; | |
5890 | } | |
5891 | ||
9f029e83 | 5892 | trace_branch_disable(); |
613f04a0 | 5893 | |
50512ab5 | 5894 | tr->current_trace->enabled--; |
613f04a0 | 5895 | |
2b6080f2 SR |
5896 | if (tr->current_trace->reset) |
5897 | tr->current_trace->reset(tr); | |
34600f0e | 5898 | |
74401729 | 5899 | /* Current trace needs to be nop_trace before synchronize_rcu */ |
2b6080f2 | 5900 | tr->current_trace = &nop_trace; |
34600f0e | 5901 | |
45ad21ca SRRH |
5902 | #ifdef CONFIG_TRACER_MAX_TRACE |
5903 | had_max_tr = tr->allocated_snapshot; | |
34600f0e SR |
5904 | |
5905 | if (had_max_tr && !t->use_max_tr) { | |
5906 | /* | |
5907 | * We need to make sure that the update_max_tr sees that | |
5908 | * current_trace changed to nop_trace to keep it from | |
5909 | * swapping the buffers after we resize it. | |
5910 | * The update_max_tr is called from interrupts disabled | |
5911 | * so a synchronized_sched() is sufficient. | |
5912 | */ | |
74401729 | 5913 | synchronize_rcu(); |
3209cff4 | 5914 | free_snapshot(tr); |
ef710e10 | 5915 | } |
12883efb | 5916 | #endif |
12883efb SRRH |
5917 | |
5918 | #ifdef CONFIG_TRACER_MAX_TRACE | |
34600f0e | 5919 | if (t->use_max_tr && !had_max_tr) { |
2824f503 | 5920 | ret = tracing_alloc_snapshot_instance(tr); |
d60da506 HT |
5921 | if (ret < 0) |
5922 | goto out; | |
ef710e10 | 5923 | } |
12883efb | 5924 | #endif |
577b785f | 5925 | |
1c80025a | 5926 | if (t->init) { |
b6f11df2 | 5927 | ret = tracer_init(t, tr); |
1c80025a FW |
5928 | if (ret) |
5929 | goto out; | |
5930 | } | |
bc0c38d1 | 5931 | |
2b6080f2 | 5932 | tr->current_trace = t; |
50512ab5 | 5933 | tr->current_trace->enabled++; |
9f029e83 | 5934 | trace_branch_enable(tr); |
bc0c38d1 SR |
5935 | out: |
5936 | mutex_unlock(&trace_types_lock); | |
5937 | ||
d9e54076 PZ |
5938 | return ret; |
5939 | } | |
5940 | ||
5941 | static ssize_t | |
5942 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, | |
5943 | size_t cnt, loff_t *ppos) | |
5944 | { | |
607e2ea1 | 5945 | struct trace_array *tr = filp->private_data; |
ee6c2c1b | 5946 | char buf[MAX_TRACER_SIZE+1]; |
d9e54076 PZ |
5947 | int i; |
5948 | size_t ret; | |
e6e7a65a FW |
5949 | int err; |
5950 | ||
5951 | ret = cnt; | |
d9e54076 | 5952 | |
ee6c2c1b LZ |
5953 | if (cnt > MAX_TRACER_SIZE) |
5954 | cnt = MAX_TRACER_SIZE; | |
d9e54076 | 5955 | |
4afe6495 | 5956 | if (copy_from_user(buf, ubuf, cnt)) |
d9e54076 PZ |
5957 | return -EFAULT; |
5958 | ||
5959 | buf[cnt] = 0; | |
5960 | ||
5961 | /* strip ending whitespace. */ | |
5962 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) | |
5963 | buf[i] = 0; | |
5964 | ||
607e2ea1 | 5965 | err = tracing_set_tracer(tr, buf); |
e6e7a65a FW |
5966 | if (err) |
5967 | return err; | |
d9e54076 | 5968 | |
cf8517cf | 5969 | *ppos += ret; |
bc0c38d1 | 5970 | |
c2931e05 | 5971 | return ret; |
bc0c38d1 SR |
5972 | } |
5973 | ||
5974 | static ssize_t | |
6508fa76 SF |
5975 | tracing_nsecs_read(unsigned long *ptr, char __user *ubuf, |
5976 | size_t cnt, loff_t *ppos) | |
bc0c38d1 | 5977 | { |
bc0c38d1 SR |
5978 | char buf[64]; |
5979 | int r; | |
5980 | ||
cffae437 | 5981 | r = snprintf(buf, sizeof(buf), "%ld\n", |
bc0c38d1 | 5982 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
cffae437 SR |
5983 | if (r > sizeof(buf)) |
5984 | r = sizeof(buf); | |
4bf39a94 | 5985 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
5986 | } |
5987 | ||
5988 | static ssize_t | |
6508fa76 SF |
5989 | tracing_nsecs_write(unsigned long *ptr, const char __user *ubuf, |
5990 | size_t cnt, loff_t *ppos) | |
bc0c38d1 | 5991 | { |
5e39841c | 5992 | unsigned long val; |
c6caeeb1 | 5993 | int ret; |
bc0c38d1 | 5994 | |
22fe9b54 PH |
5995 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
5996 | if (ret) | |
c6caeeb1 | 5997 | return ret; |
bc0c38d1 SR |
5998 | |
5999 | *ptr = val * 1000; | |
6000 | ||
6001 | return cnt; | |
6002 | } | |
6003 | ||
6508fa76 SF |
6004 | static ssize_t |
6005 | tracing_thresh_read(struct file *filp, char __user *ubuf, | |
6006 | size_t cnt, loff_t *ppos) | |
6007 | { | |
6008 | return tracing_nsecs_read(&tracing_thresh, ubuf, cnt, ppos); | |
6009 | } | |
6010 | ||
6011 | static ssize_t | |
6012 | tracing_thresh_write(struct file *filp, const char __user *ubuf, | |
6013 | size_t cnt, loff_t *ppos) | |
6014 | { | |
6015 | struct trace_array *tr = filp->private_data; | |
6016 | int ret; | |
6017 | ||
6018 | mutex_lock(&trace_types_lock); | |
6019 | ret = tracing_nsecs_write(&tracing_thresh, ubuf, cnt, ppos); | |
6020 | if (ret < 0) | |
6021 | goto out; | |
6022 | ||
6023 | if (tr->current_trace->update_thresh) { | |
6024 | ret = tr->current_trace->update_thresh(tr); | |
6025 | if (ret < 0) | |
6026 | goto out; | |
6027 | } | |
6028 | ||
6029 | ret = cnt; | |
6030 | out: | |
6031 | mutex_unlock(&trace_types_lock); | |
6032 | ||
6033 | return ret; | |
6034 | } | |
6035 | ||
f971cc9a | 6036 | #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) |
e428abbb | 6037 | |
6508fa76 SF |
6038 | static ssize_t |
6039 | tracing_max_lat_read(struct file *filp, char __user *ubuf, | |
6040 | size_t cnt, loff_t *ppos) | |
6041 | { | |
6042 | return tracing_nsecs_read(filp->private_data, ubuf, cnt, ppos); | |
6043 | } | |
6044 | ||
6045 | static ssize_t | |
6046 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, | |
6047 | size_t cnt, loff_t *ppos) | |
6048 | { | |
6049 | return tracing_nsecs_write(filp->private_data, ubuf, cnt, ppos); | |
6050 | } | |
6051 | ||
e428abbb CG |
6052 | #endif |
6053 | ||
b3806b43 SR |
6054 | static int tracing_open_pipe(struct inode *inode, struct file *filp) |
6055 | { | |
15544209 | 6056 | struct trace_array *tr = inode->i_private; |
b3806b43 | 6057 | struct trace_iterator *iter; |
8530dec6 | 6058 | int ret; |
b3806b43 | 6059 | |
8530dec6 SRV |
6060 | ret = tracing_check_open_get_tr(tr); |
6061 | if (ret) | |
6062 | return ret; | |
7b85af63 | 6063 | |
b04cc6b1 FW |
6064 | mutex_lock(&trace_types_lock); |
6065 | ||
b3806b43 SR |
6066 | /* create a buffer to store the information to pass to userspace */ |
6067 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); | |
b04cc6b1 FW |
6068 | if (!iter) { |
6069 | ret = -ENOMEM; | |
f77d09a3 | 6070 | __trace_array_put(tr); |
b04cc6b1 FW |
6071 | goto out; |
6072 | } | |
b3806b43 | 6073 | |
3a161d99 | 6074 | trace_seq_init(&iter->seq); |
d716ff71 | 6075 | iter->trace = tr->current_trace; |
d7350c3f | 6076 | |
4462344e | 6077 | if (!alloc_cpumask_var(&iter->started, GFP_KERNEL)) { |
b04cc6b1 | 6078 | ret = -ENOMEM; |
d7350c3f | 6079 | goto fail; |
4462344e RR |
6080 | } |
6081 | ||
a309720c | 6082 | /* trace pipe does not show start of buffer */ |
4462344e | 6083 | cpumask_setall(iter->started); |
a309720c | 6084 | |
983f938a | 6085 | if (tr->trace_flags & TRACE_ITER_LATENCY_FMT) |
112f38a7 SR |
6086 | iter->iter_flags |= TRACE_FILE_LAT_FMT; |
6087 | ||
8be0709f | 6088 | /* Output in nanoseconds only if we are using a clock in nanoseconds. */ |
58e8eedf | 6089 | if (trace_clocks[tr->clock_id].in_ns) |
8be0709f DS |
6090 | iter->iter_flags |= TRACE_FILE_TIME_IN_NS; |
6091 | ||
15544209 | 6092 | iter->tr = tr; |
1c5eb448 | 6093 | iter->array_buffer = &tr->array_buffer; |
15544209 | 6094 | iter->cpu_file = tracing_get_cpu(inode); |
d7350c3f | 6095 | mutex_init(&iter->mutex); |
b3806b43 SR |
6096 | filp->private_data = iter; |
6097 | ||
107bad8b SR |
6098 | if (iter->trace->pipe_open) |
6099 | iter->trace->pipe_open(iter); | |
107bad8b | 6100 | |
b444786f | 6101 | nonseekable_open(inode, filp); |
cf6ab6d9 SRRH |
6102 | |
6103 | tr->current_trace->ref++; | |
b04cc6b1 FW |
6104 | out: |
6105 | mutex_unlock(&trace_types_lock); | |
6106 | return ret; | |
d7350c3f FW |
6107 | |
6108 | fail: | |
d7350c3f | 6109 | kfree(iter); |
7b85af63 | 6110 | __trace_array_put(tr); |
d7350c3f FW |
6111 | mutex_unlock(&trace_types_lock); |
6112 | return ret; | |
b3806b43 SR |
6113 | } |
6114 | ||
6115 | static int tracing_release_pipe(struct inode *inode, struct file *file) | |
6116 | { | |
6117 | struct trace_iterator *iter = file->private_data; | |
15544209 | 6118 | struct trace_array *tr = inode->i_private; |
b3806b43 | 6119 | |
b04cc6b1 FW |
6120 | mutex_lock(&trace_types_lock); |
6121 | ||
cf6ab6d9 SRRH |
6122 | tr->current_trace->ref--; |
6123 | ||
29bf4a5e | 6124 | if (iter->trace->pipe_close) |
c521efd1 SR |
6125 | iter->trace->pipe_close(iter); |
6126 | ||
b04cc6b1 FW |
6127 | mutex_unlock(&trace_types_lock); |
6128 | ||
4462344e | 6129 | free_cpumask_var(iter->started); |
d7350c3f | 6130 | mutex_destroy(&iter->mutex); |
b3806b43 | 6131 | kfree(iter); |
b3806b43 | 6132 | |
7b85af63 SRRH |
6133 | trace_array_put(tr); |
6134 | ||
b3806b43 SR |
6135 | return 0; |
6136 | } | |
6137 | ||
9dd95748 | 6138 | static __poll_t |
cc60cdc9 | 6139 | trace_poll(struct trace_iterator *iter, struct file *filp, poll_table *poll_table) |
2a2cc8f7 | 6140 | { |
983f938a SRRH |
6141 | struct trace_array *tr = iter->tr; |
6142 | ||
15693458 SRRH |
6143 | /* Iterators are static, they should be filled or empty */ |
6144 | if (trace_buffer_iter(iter, iter->cpu_file)) | |
a9a08845 | 6145 | return EPOLLIN | EPOLLRDNORM; |
2a2cc8f7 | 6146 | |
983f938a | 6147 | if (tr->trace_flags & TRACE_ITER_BLOCK) |
2a2cc8f7 SSP |
6148 | /* |
6149 | * Always select as readable when in blocking mode | |
6150 | */ | |
a9a08845 | 6151 | return EPOLLIN | EPOLLRDNORM; |
15693458 | 6152 | else |
1c5eb448 | 6153 | return ring_buffer_poll_wait(iter->array_buffer->buffer, iter->cpu_file, |
15693458 | 6154 | filp, poll_table); |
2a2cc8f7 | 6155 | } |
2a2cc8f7 | 6156 | |
9dd95748 | 6157 | static __poll_t |
cc60cdc9 SR |
6158 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) |
6159 | { | |
6160 | struct trace_iterator *iter = filp->private_data; | |
6161 | ||
6162 | return trace_poll(iter, filp, poll_table); | |
2a2cc8f7 SSP |
6163 | } |
6164 | ||
d716ff71 | 6165 | /* Must be called with iter->mutex held. */ |
ff98781b | 6166 | static int tracing_wait_pipe(struct file *filp) |
b3806b43 SR |
6167 | { |
6168 | struct trace_iterator *iter = filp->private_data; | |
8b8b3683 | 6169 | int ret; |
b3806b43 | 6170 | |
b3806b43 | 6171 | while (trace_empty(iter)) { |
2dc8f095 | 6172 | |
107bad8b | 6173 | if ((filp->f_flags & O_NONBLOCK)) { |
ff98781b | 6174 | return -EAGAIN; |
107bad8b | 6175 | } |
2dc8f095 | 6176 | |
b3806b43 | 6177 | /* |
250bfd3d | 6178 | * We block until we read something and tracing is disabled. |
b3806b43 SR |
6179 | * We still block if tracing is disabled, but we have never |
6180 | * read anything. This allows a user to cat this file, and | |
6181 | * then enable tracing. But after we have read something, | |
6182 | * we give an EOF when tracing is again disabled. | |
6183 | * | |
6184 | * iter->pos will be 0 if we haven't read anything. | |
6185 | */ | |
75df6e68 | 6186 | if (!tracer_tracing_is_on(iter->tr) && iter->pos) |
b3806b43 | 6187 | break; |
f4874261 SRRH |
6188 | |
6189 | mutex_unlock(&iter->mutex); | |
6190 | ||
2c2b0a78 | 6191 | ret = wait_on_pipe(iter, 0); |
f4874261 SRRH |
6192 | |
6193 | mutex_lock(&iter->mutex); | |
6194 | ||
8b8b3683 SRRH |
6195 | if (ret) |
6196 | return ret; | |
b3806b43 SR |
6197 | } |
6198 | ||
ff98781b EGM |
6199 | return 1; |
6200 | } | |
6201 | ||
6202 | /* | |
6203 | * Consumer reader. | |
6204 | */ | |
6205 | static ssize_t | |
6206 | tracing_read_pipe(struct file *filp, char __user *ubuf, | |
6207 | size_t cnt, loff_t *ppos) | |
6208 | { | |
6209 | struct trace_iterator *iter = filp->private_data; | |
6210 | ssize_t sret; | |
6211 | ||
d7350c3f FW |
6212 | /* |
6213 | * Avoid more than one consumer on a single file descriptor | |
6214 | * This is just a matter of traces coherency, the ring buffer itself | |
6215 | * is protected. | |
6216 | */ | |
6217 | mutex_lock(&iter->mutex); | |
1245800c SRRH |
6218 | |
6219 | /* return any leftover data */ | |
6220 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); | |
6221 | if (sret != -EBUSY) | |
6222 | goto out; | |
6223 | ||
6224 | trace_seq_init(&iter->seq); | |
6225 | ||
ff98781b EGM |
6226 | if (iter->trace->read) { |
6227 | sret = iter->trace->read(iter, filp, ubuf, cnt, ppos); | |
6228 | if (sret) | |
6229 | goto out; | |
6230 | } | |
6231 | ||
6232 | waitagain: | |
6233 | sret = tracing_wait_pipe(filp); | |
6234 | if (sret <= 0) | |
6235 | goto out; | |
6236 | ||
b3806b43 | 6237 | /* stop when tracing is finished */ |
ff98781b EGM |
6238 | if (trace_empty(iter)) { |
6239 | sret = 0; | |
107bad8b | 6240 | goto out; |
ff98781b | 6241 | } |
b3806b43 SR |
6242 | |
6243 | if (cnt >= PAGE_SIZE) | |
6244 | cnt = PAGE_SIZE - 1; | |
6245 | ||
53d0aa77 | 6246 | /* reset all but tr, trace, and overruns */ |
53d0aa77 SR |
6247 | memset(&iter->seq, 0, |
6248 | sizeof(struct trace_iterator) - | |
6249 | offsetof(struct trace_iterator, seq)); | |
ed5467da | 6250 | cpumask_clear(iter->started); |
d303de1f | 6251 | trace_seq_init(&iter->seq); |
4823ed7e | 6252 | iter->pos = -1; |
b3806b43 | 6253 | |
4f535968 | 6254 | trace_event_read_lock(); |
7e53bd42 | 6255 | trace_access_lock(iter->cpu_file); |
955b61e5 | 6256 | while (trace_find_next_entry_inc(iter) != NULL) { |
2c4f035f | 6257 | enum print_line_t ret; |
5ac48378 | 6258 | int save_len = iter->seq.seq.len; |
088b1e42 | 6259 | |
f9896bf3 | 6260 | ret = print_trace_line(iter); |
2c4f035f | 6261 | if (ret == TRACE_TYPE_PARTIAL_LINE) { |
088b1e42 | 6262 | /* don't print partial lines */ |
5ac48378 | 6263 | iter->seq.seq.len = save_len; |
b3806b43 | 6264 | break; |
088b1e42 | 6265 | } |
b91facc3 FW |
6266 | if (ret != TRACE_TYPE_NO_CONSUME) |
6267 | trace_consume(iter); | |
b3806b43 | 6268 | |
5ac48378 | 6269 | if (trace_seq_used(&iter->seq) >= cnt) |
b3806b43 | 6270 | break; |
ee5e51f5 JO |
6271 | |
6272 | /* | |
6273 | * Setting the full flag means we reached the trace_seq buffer | |
6274 | * size and we should leave by partial output condition above. | |
6275 | * One of the trace_seq_* functions is not used properly. | |
6276 | */ | |
6277 | WARN_ONCE(iter->seq.full, "full flag set for trace type %d", | |
6278 | iter->ent->type); | |
b3806b43 | 6279 | } |
7e53bd42 | 6280 | trace_access_unlock(iter->cpu_file); |
4f535968 | 6281 | trace_event_read_unlock(); |
b3806b43 | 6282 | |
b3806b43 | 6283 | /* Now copy what we have to the user */ |
6c6c2796 | 6284 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
5ac48378 | 6285 | if (iter->seq.seq.readpos >= trace_seq_used(&iter->seq)) |
f9520750 | 6286 | trace_seq_init(&iter->seq); |
9ff4b974 PP |
6287 | |
6288 | /* | |
25985edc | 6289 | * If there was nothing to send to user, in spite of consuming trace |
9ff4b974 PP |
6290 | * entries, go back to wait for more entries. |
6291 | */ | |
6c6c2796 | 6292 | if (sret == -EBUSY) |
9ff4b974 | 6293 | goto waitagain; |
b3806b43 | 6294 | |
107bad8b | 6295 | out: |
d7350c3f | 6296 | mutex_unlock(&iter->mutex); |
107bad8b | 6297 | |
6c6c2796 | 6298 | return sret; |
b3806b43 SR |
6299 | } |
6300 | ||
3c56819b EGM |
6301 | static void tracing_spd_release_pipe(struct splice_pipe_desc *spd, |
6302 | unsigned int idx) | |
6303 | { | |
6304 | __free_page(spd->pages[idx]); | |
6305 | } | |
6306 | ||
28dfef8f | 6307 | static const struct pipe_buf_operations tracing_pipe_buf_ops = { |
34cd4998 | 6308 | .confirm = generic_pipe_buf_confirm, |
92fdd98c | 6309 | .release = generic_pipe_buf_release, |
34cd4998 SR |
6310 | .steal = generic_pipe_buf_steal, |
6311 | .get = generic_pipe_buf_get, | |
3c56819b EGM |
6312 | }; |
6313 | ||
34cd4998 | 6314 | static size_t |
fa7c7f6e | 6315 | tracing_fill_pipe_page(size_t rem, struct trace_iterator *iter) |
34cd4998 SR |
6316 | { |
6317 | size_t count; | |
74f06bb7 | 6318 | int save_len; |
34cd4998 SR |
6319 | int ret; |
6320 | ||
6321 | /* Seq buffer is page-sized, exactly what we need. */ | |
6322 | for (;;) { | |
74f06bb7 | 6323 | save_len = iter->seq.seq.len; |
34cd4998 | 6324 | ret = print_trace_line(iter); |
74f06bb7 SRRH |
6325 | |
6326 | if (trace_seq_has_overflowed(&iter->seq)) { | |
6327 | iter->seq.seq.len = save_len; | |
34cd4998 SR |
6328 | break; |
6329 | } | |
74f06bb7 SRRH |
6330 | |
6331 | /* | |
6332 | * This should not be hit, because it should only | |
6333 | * be set if the iter->seq overflowed. But check it | |
6334 | * anyway to be safe. | |
6335 | */ | |
34cd4998 | 6336 | if (ret == TRACE_TYPE_PARTIAL_LINE) { |
74f06bb7 SRRH |
6337 | iter->seq.seq.len = save_len; |
6338 | break; | |
6339 | } | |
6340 | ||
5ac48378 | 6341 | count = trace_seq_used(&iter->seq) - save_len; |
74f06bb7 SRRH |
6342 | if (rem < count) { |
6343 | rem = 0; | |
6344 | iter->seq.seq.len = save_len; | |
34cd4998 SR |
6345 | break; |
6346 | } | |
6347 | ||
74e7ff8c LJ |
6348 | if (ret != TRACE_TYPE_NO_CONSUME) |
6349 | trace_consume(iter); | |
34cd4998 | 6350 | rem -= count; |
955b61e5 | 6351 | if (!trace_find_next_entry_inc(iter)) { |
34cd4998 SR |
6352 | rem = 0; |
6353 | iter->ent = NULL; | |
6354 | break; | |
6355 | } | |
6356 | } | |
6357 | ||
6358 | return rem; | |
6359 | } | |
6360 | ||
3c56819b EGM |
6361 | static ssize_t tracing_splice_read_pipe(struct file *filp, |
6362 | loff_t *ppos, | |
6363 | struct pipe_inode_info *pipe, | |
6364 | size_t len, | |
6365 | unsigned int flags) | |
6366 | { | |
35f3d14d JA |
6367 | struct page *pages_def[PIPE_DEF_BUFFERS]; |
6368 | struct partial_page partial_def[PIPE_DEF_BUFFERS]; | |
3c56819b EGM |
6369 | struct trace_iterator *iter = filp->private_data; |
6370 | struct splice_pipe_desc spd = { | |
35f3d14d JA |
6371 | .pages = pages_def, |
6372 | .partial = partial_def, | |
34cd4998 | 6373 | .nr_pages = 0, /* This gets updated below. */ |
047fe360 | 6374 | .nr_pages_max = PIPE_DEF_BUFFERS, |
34cd4998 SR |
6375 | .ops = &tracing_pipe_buf_ops, |
6376 | .spd_release = tracing_spd_release_pipe, | |
3c56819b EGM |
6377 | }; |
6378 | ssize_t ret; | |
34cd4998 | 6379 | size_t rem; |
3c56819b EGM |
6380 | unsigned int i; |
6381 | ||
35f3d14d JA |
6382 | if (splice_grow_spd(pipe, &spd)) |
6383 | return -ENOMEM; | |
6384 | ||
d7350c3f | 6385 | mutex_lock(&iter->mutex); |
3c56819b EGM |
6386 | |
6387 | if (iter->trace->splice_read) { | |
6388 | ret = iter->trace->splice_read(iter, filp, | |
6389 | ppos, pipe, len, flags); | |
6390 | if (ret) | |
34cd4998 | 6391 | goto out_err; |
3c56819b EGM |
6392 | } |
6393 | ||
6394 | ret = tracing_wait_pipe(filp); | |
6395 | if (ret <= 0) | |
34cd4998 | 6396 | goto out_err; |
3c56819b | 6397 | |
955b61e5 | 6398 | if (!iter->ent && !trace_find_next_entry_inc(iter)) { |
3c56819b | 6399 | ret = -EFAULT; |
34cd4998 | 6400 | goto out_err; |
3c56819b EGM |
6401 | } |
6402 | ||
4f535968 | 6403 | trace_event_read_lock(); |
7e53bd42 | 6404 | trace_access_lock(iter->cpu_file); |
4f535968 | 6405 | |
3c56819b | 6406 | /* Fill as many pages as possible. */ |
a786c06d | 6407 | for (i = 0, rem = len; i < spd.nr_pages_max && rem; i++) { |
35f3d14d JA |
6408 | spd.pages[i] = alloc_page(GFP_KERNEL); |
6409 | if (!spd.pages[i]) | |
34cd4998 | 6410 | break; |
3c56819b | 6411 | |
fa7c7f6e | 6412 | rem = tracing_fill_pipe_page(rem, iter); |
3c56819b EGM |
6413 | |
6414 | /* Copy the data into the page, so we can start over. */ | |
6415 | ret = trace_seq_to_buffer(&iter->seq, | |
35f3d14d | 6416 | page_address(spd.pages[i]), |
5ac48378 | 6417 | trace_seq_used(&iter->seq)); |
3c56819b | 6418 | if (ret < 0) { |
35f3d14d | 6419 | __free_page(spd.pages[i]); |
3c56819b EGM |
6420 | break; |
6421 | } | |
35f3d14d | 6422 | spd.partial[i].offset = 0; |
5ac48378 | 6423 | spd.partial[i].len = trace_seq_used(&iter->seq); |
3c56819b | 6424 | |
f9520750 | 6425 | trace_seq_init(&iter->seq); |
3c56819b EGM |
6426 | } |
6427 | ||
7e53bd42 | 6428 | trace_access_unlock(iter->cpu_file); |
4f535968 | 6429 | trace_event_read_unlock(); |
d7350c3f | 6430 | mutex_unlock(&iter->mutex); |
3c56819b EGM |
6431 | |
6432 | spd.nr_pages = i; | |
6433 | ||
a29054d9 SRRH |
6434 | if (i) |
6435 | ret = splice_to_pipe(pipe, &spd); | |
6436 | else | |
6437 | ret = 0; | |
35f3d14d | 6438 | out: |
047fe360 | 6439 | splice_shrink_spd(&spd); |
35f3d14d | 6440 | return ret; |
3c56819b | 6441 | |
34cd4998 | 6442 | out_err: |
d7350c3f | 6443 | mutex_unlock(&iter->mutex); |
35f3d14d | 6444 | goto out; |
3c56819b EGM |
6445 | } |
6446 | ||
a98a3c3f SR |
6447 | static ssize_t |
6448 | tracing_entries_read(struct file *filp, char __user *ubuf, | |
6449 | size_t cnt, loff_t *ppos) | |
6450 | { | |
0bc392ee ON |
6451 | struct inode *inode = file_inode(filp); |
6452 | struct trace_array *tr = inode->i_private; | |
6453 | int cpu = tracing_get_cpu(inode); | |
438ced17 VN |
6454 | char buf[64]; |
6455 | int r = 0; | |
6456 | ssize_t ret; | |
a98a3c3f | 6457 | |
db526ca3 | 6458 | mutex_lock(&trace_types_lock); |
438ced17 | 6459 | |
0bc392ee | 6460 | if (cpu == RING_BUFFER_ALL_CPUS) { |
438ced17 VN |
6461 | int cpu, buf_size_same; |
6462 | unsigned long size; | |
6463 | ||
6464 | size = 0; | |
6465 | buf_size_same = 1; | |
6466 | /* check if all cpu sizes are same */ | |
6467 | for_each_tracing_cpu(cpu) { | |
6468 | /* fill in the size from first enabled cpu */ | |
6469 | if (size == 0) | |
1c5eb448 SRV |
6470 | size = per_cpu_ptr(tr->array_buffer.data, cpu)->entries; |
6471 | if (size != per_cpu_ptr(tr->array_buffer.data, cpu)->entries) { | |
438ced17 VN |
6472 | buf_size_same = 0; |
6473 | break; | |
6474 | } | |
6475 | } | |
6476 | ||
6477 | if (buf_size_same) { | |
6478 | if (!ring_buffer_expanded) | |
6479 | r = sprintf(buf, "%lu (expanded: %lu)\n", | |
6480 | size >> 10, | |
6481 | trace_buf_size >> 10); | |
6482 | else | |
6483 | r = sprintf(buf, "%lu\n", size >> 10); | |
6484 | } else | |
6485 | r = sprintf(buf, "X\n"); | |
6486 | } else | |
1c5eb448 | 6487 | r = sprintf(buf, "%lu\n", per_cpu_ptr(tr->array_buffer.data, cpu)->entries >> 10); |
438ced17 | 6488 | |
db526ca3 SR |
6489 | mutex_unlock(&trace_types_lock); |
6490 | ||
438ced17 VN |
6491 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
6492 | return ret; | |
a98a3c3f SR |
6493 | } |
6494 | ||
6495 | static ssize_t | |
6496 | tracing_entries_write(struct file *filp, const char __user *ubuf, | |
6497 | size_t cnt, loff_t *ppos) | |
6498 | { | |
0bc392ee ON |
6499 | struct inode *inode = file_inode(filp); |
6500 | struct trace_array *tr = inode->i_private; | |
a98a3c3f | 6501 | unsigned long val; |
4f271a2a | 6502 | int ret; |
a98a3c3f | 6503 | |
22fe9b54 PH |
6504 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
6505 | if (ret) | |
c6caeeb1 | 6506 | return ret; |
a98a3c3f SR |
6507 | |
6508 | /* must have at least 1 entry */ | |
6509 | if (!val) | |
6510 | return -EINVAL; | |
6511 | ||
1696b2b0 SR |
6512 | /* value is in KB */ |
6513 | val <<= 10; | |
0bc392ee | 6514 | ret = tracing_resize_ring_buffer(tr, val, tracing_get_cpu(inode)); |
4f271a2a VN |
6515 | if (ret < 0) |
6516 | return ret; | |
a98a3c3f | 6517 | |
cf8517cf | 6518 | *ppos += cnt; |
a98a3c3f | 6519 | |
4f271a2a VN |
6520 | return cnt; |
6521 | } | |
bf5e6519 | 6522 | |
f81ab074 VN |
6523 | static ssize_t |
6524 | tracing_total_entries_read(struct file *filp, char __user *ubuf, | |
6525 | size_t cnt, loff_t *ppos) | |
6526 | { | |
6527 | struct trace_array *tr = filp->private_data; | |
6528 | char buf[64]; | |
6529 | int r, cpu; | |
6530 | unsigned long size = 0, expanded_size = 0; | |
6531 | ||
6532 | mutex_lock(&trace_types_lock); | |
6533 | for_each_tracing_cpu(cpu) { | |
1c5eb448 | 6534 | size += per_cpu_ptr(tr->array_buffer.data, cpu)->entries >> 10; |
f81ab074 VN |
6535 | if (!ring_buffer_expanded) |
6536 | expanded_size += trace_buf_size >> 10; | |
6537 | } | |
6538 | if (ring_buffer_expanded) | |
6539 | r = sprintf(buf, "%lu\n", size); | |
6540 | else | |
6541 | r = sprintf(buf, "%lu (expanded: %lu)\n", size, expanded_size); | |
6542 | mutex_unlock(&trace_types_lock); | |
6543 | ||
6544 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
6545 | } | |
6546 | ||
4f271a2a VN |
6547 | static ssize_t |
6548 | tracing_free_buffer_write(struct file *filp, const char __user *ubuf, | |
6549 | size_t cnt, loff_t *ppos) | |
6550 | { | |
6551 | /* | |
6552 | * There is no need to read what the user has written, this function | |
6553 | * is just to make sure that there is no error when "echo" is used | |
6554 | */ | |
6555 | ||
6556 | *ppos += cnt; | |
a98a3c3f SR |
6557 | |
6558 | return cnt; | |
6559 | } | |
6560 | ||
4f271a2a VN |
6561 | static int |
6562 | tracing_free_buffer_release(struct inode *inode, struct file *filp) | |
6563 | { | |
2b6080f2 SR |
6564 | struct trace_array *tr = inode->i_private; |
6565 | ||
cf30cf67 | 6566 | /* disable tracing ? */ |
983f938a | 6567 | if (tr->trace_flags & TRACE_ITER_STOP_ON_FREE) |
711e1243 | 6568 | tracer_tracing_off(tr); |
4f271a2a | 6569 | /* resize the ring buffer to 0 */ |
2b6080f2 | 6570 | tracing_resize_ring_buffer(tr, 0, RING_BUFFER_ALL_CPUS); |
4f271a2a | 6571 | |
7b85af63 SRRH |
6572 | trace_array_put(tr); |
6573 | ||
4f271a2a VN |
6574 | return 0; |
6575 | } | |
6576 | ||
5bf9a1ee PP |
6577 | static ssize_t |
6578 | tracing_mark_write(struct file *filp, const char __user *ubuf, | |
6579 | size_t cnt, loff_t *fpos) | |
6580 | { | |
2d71619c | 6581 | struct trace_array *tr = filp->private_data; |
d696b58c | 6582 | struct ring_buffer_event *event; |
3dd80953 | 6583 | enum event_trigger_type tt = ETT_NONE; |
13292494 | 6584 | struct trace_buffer *buffer; |
d696b58c SR |
6585 | struct print_entry *entry; |
6586 | unsigned long irq_flags; | |
d696b58c | 6587 | ssize_t written; |
d696b58c SR |
6588 | int size; |
6589 | int len; | |
fa32e855 | 6590 | |
656c7f0d | 6591 | /* Used in tracing_mark_raw_write() as well */ |
0f5e5a3a RV |
6592 | #define FAULTED_STR "<faulted>" |
6593 | #define FAULTED_SIZE (sizeof(FAULTED_STR) - 1) /* '\0' is already accounted for */ | |
5bf9a1ee | 6594 | |
c76f0694 | 6595 | if (tracing_disabled) |
5bf9a1ee PP |
6596 | return -EINVAL; |
6597 | ||
983f938a | 6598 | if (!(tr->trace_flags & TRACE_ITER_MARKERS)) |
5224c3a3 MSB |
6599 | return -EINVAL; |
6600 | ||
5bf9a1ee PP |
6601 | if (cnt > TRACE_BUF_SIZE) |
6602 | cnt = TRACE_BUF_SIZE; | |
6603 | ||
d696b58c | 6604 | BUILD_BUG_ON(TRACE_BUF_SIZE >= PAGE_SIZE); |
5bf9a1ee | 6605 | |
d696b58c | 6606 | local_save_flags(irq_flags); |
656c7f0d | 6607 | size = sizeof(*entry) + cnt + 2; /* add '\0' and possible '\n' */ |
d696b58c | 6608 | |
656c7f0d SRRH |
6609 | /* If less than "<faulted>", then make sure we can still add that */ |
6610 | if (cnt < FAULTED_SIZE) | |
6611 | size += FAULTED_SIZE - cnt; | |
d696b58c | 6612 | |
1c5eb448 | 6613 | buffer = tr->array_buffer.buffer; |
3e9a8aad SRRH |
6614 | event = __trace_buffer_lock_reserve(buffer, TRACE_PRINT, size, |
6615 | irq_flags, preempt_count()); | |
656c7f0d | 6616 | if (unlikely(!event)) |
d696b58c | 6617 | /* Ring buffer disabled, return as if not open for write */ |
656c7f0d | 6618 | return -EBADF; |
d696b58c SR |
6619 | |
6620 | entry = ring_buffer_event_data(event); | |
6621 | entry->ip = _THIS_IP_; | |
6622 | ||
656c7f0d SRRH |
6623 | len = __copy_from_user_inatomic(&entry->buf, ubuf, cnt); |
6624 | if (len) { | |
0f5e5a3a | 6625 | memcpy(&entry->buf, FAULTED_STR, FAULTED_SIZE); |
656c7f0d SRRH |
6626 | cnt = FAULTED_SIZE; |
6627 | written = -EFAULT; | |
c13d2f7c | 6628 | } else |
656c7f0d SRRH |
6629 | written = cnt; |
6630 | len = cnt; | |
5bf9a1ee | 6631 | |
3dd80953 SRV |
6632 | if (tr->trace_marker_file && !list_empty(&tr->trace_marker_file->triggers)) { |
6633 | /* do not add \n before testing triggers, but add \0 */ | |
6634 | entry->buf[cnt] = '\0'; | |
6635 | tt = event_triggers_call(tr->trace_marker_file, entry, event); | |
6636 | } | |
6637 | ||
d696b58c SR |
6638 | if (entry->buf[cnt - 1] != '\n') { |
6639 | entry->buf[cnt] = '\n'; | |
6640 | entry->buf[cnt + 1] = '\0'; | |
6641 | } else | |
6642 | entry->buf[cnt] = '\0'; | |
6643 | ||
7ffbd48d | 6644 | __buffer_unlock_commit(buffer, event); |
5bf9a1ee | 6645 | |
3dd80953 SRV |
6646 | if (tt) |
6647 | event_triggers_post_call(tr->trace_marker_file, tt); | |
6648 | ||
656c7f0d SRRH |
6649 | if (written > 0) |
6650 | *fpos += written; | |
5bf9a1ee | 6651 | |
fa32e855 SR |
6652 | return written; |
6653 | } | |
6654 | ||
6655 | /* Limit it for now to 3K (including tag) */ | |
6656 | #define RAW_DATA_MAX_SIZE (1024*3) | |
6657 | ||
6658 | static ssize_t | |
6659 | tracing_mark_raw_write(struct file *filp, const char __user *ubuf, | |
6660 | size_t cnt, loff_t *fpos) | |
6661 | { | |
6662 | struct trace_array *tr = filp->private_data; | |
6663 | struct ring_buffer_event *event; | |
13292494 | 6664 | struct trace_buffer *buffer; |
fa32e855 SR |
6665 | struct raw_data_entry *entry; |
6666 | unsigned long irq_flags; | |
fa32e855 | 6667 | ssize_t written; |
fa32e855 SR |
6668 | int size; |
6669 | int len; | |
6670 | ||
656c7f0d SRRH |
6671 | #define FAULT_SIZE_ID (FAULTED_SIZE + sizeof(int)) |
6672 | ||
fa32e855 SR |
6673 | if (tracing_disabled) |
6674 | return -EINVAL; | |
6675 | ||
6676 | if (!(tr->trace_flags & TRACE_ITER_MARKERS)) | |
6677 | return -EINVAL; | |
6678 | ||
6679 | /* The marker must at least have a tag id */ | |
6680 | if (cnt < sizeof(unsigned int) || cnt > RAW_DATA_MAX_SIZE) | |
6681 | return -EINVAL; | |
6682 | ||
6683 | if (cnt > TRACE_BUF_SIZE) | |
6684 | cnt = TRACE_BUF_SIZE; | |
6685 | ||
6686 | BUILD_BUG_ON(TRACE_BUF_SIZE >= PAGE_SIZE); | |
6687 | ||
fa32e855 SR |
6688 | local_save_flags(irq_flags); |
6689 | size = sizeof(*entry) + cnt; | |
656c7f0d SRRH |
6690 | if (cnt < FAULT_SIZE_ID) |
6691 | size += FAULT_SIZE_ID - cnt; | |
6692 | ||
1c5eb448 | 6693 | buffer = tr->array_buffer.buffer; |
3e9a8aad SRRH |
6694 | event = __trace_buffer_lock_reserve(buffer, TRACE_RAW_DATA, size, |
6695 | irq_flags, preempt_count()); | |
656c7f0d | 6696 | if (!event) |
fa32e855 | 6697 | /* Ring buffer disabled, return as if not open for write */ |
656c7f0d | 6698 | return -EBADF; |
fa32e855 SR |
6699 | |
6700 | entry = ring_buffer_event_data(event); | |
6701 | ||
656c7f0d SRRH |
6702 | len = __copy_from_user_inatomic(&entry->id, ubuf, cnt); |
6703 | if (len) { | |
6704 | entry->id = -1; | |
0f5e5a3a | 6705 | memcpy(&entry->buf, FAULTED_STR, FAULTED_SIZE); |
656c7f0d | 6706 | written = -EFAULT; |
fa32e855 | 6707 | } else |
656c7f0d | 6708 | written = cnt; |
fa32e855 SR |
6709 | |
6710 | __buffer_unlock_commit(buffer, event); | |
6711 | ||
656c7f0d SRRH |
6712 | if (written > 0) |
6713 | *fpos += written; | |
1aa54bca MS |
6714 | |
6715 | return written; | |
5bf9a1ee PP |
6716 | } |
6717 | ||
13f16d20 | 6718 | static int tracing_clock_show(struct seq_file *m, void *v) |
5079f326 | 6719 | { |
2b6080f2 | 6720 | struct trace_array *tr = m->private; |
5079f326 Z |
6721 | int i; |
6722 | ||
6723 | for (i = 0; i < ARRAY_SIZE(trace_clocks); i++) | |
13f16d20 | 6724 | seq_printf(m, |
5079f326 | 6725 | "%s%s%s%s", i ? " " : "", |
2b6080f2 SR |
6726 | i == tr->clock_id ? "[" : "", trace_clocks[i].name, |
6727 | i == tr->clock_id ? "]" : ""); | |
13f16d20 | 6728 | seq_putc(m, '\n'); |
5079f326 | 6729 | |
13f16d20 | 6730 | return 0; |
5079f326 Z |
6731 | } |
6732 | ||
d71bd34d | 6733 | int tracing_set_clock(struct trace_array *tr, const char *clockstr) |
5079f326 | 6734 | { |
5079f326 Z |
6735 | int i; |
6736 | ||
5079f326 Z |
6737 | for (i = 0; i < ARRAY_SIZE(trace_clocks); i++) { |
6738 | if (strcmp(trace_clocks[i].name, clockstr) == 0) | |
6739 | break; | |
6740 | } | |
6741 | if (i == ARRAY_SIZE(trace_clocks)) | |
6742 | return -EINVAL; | |
6743 | ||
5079f326 Z |
6744 | mutex_lock(&trace_types_lock); |
6745 | ||
2b6080f2 SR |
6746 | tr->clock_id = i; |
6747 | ||
1c5eb448 | 6748 | ring_buffer_set_clock(tr->array_buffer.buffer, trace_clocks[i].func); |
5079f326 | 6749 | |
60303ed3 DS |
6750 | /* |
6751 | * New clock may not be consistent with the previous clock. | |
6752 | * Reset the buffer so that it doesn't have incomparable timestamps. | |
6753 | */ | |
1c5eb448 | 6754 | tracing_reset_online_cpus(&tr->array_buffer); |
12883efb SRRH |
6755 | |
6756 | #ifdef CONFIG_TRACER_MAX_TRACE | |
170b3b10 | 6757 | if (tr->max_buffer.buffer) |
12883efb | 6758 | ring_buffer_set_clock(tr->max_buffer.buffer, trace_clocks[i].func); |
9457158b | 6759 | tracing_reset_online_cpus(&tr->max_buffer); |
12883efb | 6760 | #endif |
60303ed3 | 6761 | |
5079f326 Z |
6762 | mutex_unlock(&trace_types_lock); |
6763 | ||
e1e232ca SR |
6764 | return 0; |
6765 | } | |
6766 | ||
6767 | static ssize_t tracing_clock_write(struct file *filp, const char __user *ubuf, | |
6768 | size_t cnt, loff_t *fpos) | |
6769 | { | |
6770 | struct seq_file *m = filp->private_data; | |
6771 | struct trace_array *tr = m->private; | |
6772 | char buf[64]; | |
6773 | const char *clockstr; | |
6774 | int ret; | |
6775 | ||
6776 | if (cnt >= sizeof(buf)) | |
6777 | return -EINVAL; | |
6778 | ||
4afe6495 | 6779 | if (copy_from_user(buf, ubuf, cnt)) |
e1e232ca SR |
6780 | return -EFAULT; |
6781 | ||
6782 | buf[cnt] = 0; | |
6783 | ||
6784 | clockstr = strstrip(buf); | |
6785 | ||
6786 | ret = tracing_set_clock(tr, clockstr); | |
6787 | if (ret) | |
6788 | return ret; | |
6789 | ||
5079f326 Z |
6790 | *fpos += cnt; |
6791 | ||
6792 | return cnt; | |
6793 | } | |
6794 | ||
13f16d20 LZ |
6795 | static int tracing_clock_open(struct inode *inode, struct file *file) |
6796 | { | |
7b85af63 SRRH |
6797 | struct trace_array *tr = inode->i_private; |
6798 | int ret; | |
6799 | ||
8530dec6 SRV |
6800 | ret = tracing_check_open_get_tr(tr); |
6801 | if (ret) | |
6802 | return ret; | |
7b85af63 SRRH |
6803 | |
6804 | ret = single_open(file, tracing_clock_show, inode->i_private); | |
6805 | if (ret < 0) | |
6806 | trace_array_put(tr); | |
6807 | ||
6808 | return ret; | |
13f16d20 LZ |
6809 | } |
6810 | ||
2c1ea60b TZ |
6811 | static int tracing_time_stamp_mode_show(struct seq_file *m, void *v) |
6812 | { | |
6813 | struct trace_array *tr = m->private; | |
6814 | ||
6815 | mutex_lock(&trace_types_lock); | |
6816 | ||
1c5eb448 | 6817 | if (ring_buffer_time_stamp_abs(tr->array_buffer.buffer)) |
2c1ea60b TZ |
6818 | seq_puts(m, "delta [absolute]\n"); |
6819 | else | |
6820 | seq_puts(m, "[delta] absolute\n"); | |
6821 | ||
6822 | mutex_unlock(&trace_types_lock); | |
6823 | ||
6824 | return 0; | |
6825 | } | |
6826 | ||
6827 | static int tracing_time_stamp_mode_open(struct inode *inode, struct file *file) | |
6828 | { | |
6829 | struct trace_array *tr = inode->i_private; | |
6830 | int ret; | |
6831 | ||
8530dec6 SRV |
6832 | ret = tracing_check_open_get_tr(tr); |
6833 | if (ret) | |
6834 | return ret; | |
2c1ea60b TZ |
6835 | |
6836 | ret = single_open(file, tracing_time_stamp_mode_show, inode->i_private); | |
6837 | if (ret < 0) | |
6838 | trace_array_put(tr); | |
6839 | ||
6840 | return ret; | |
6841 | } | |
6842 | ||
00b41452 TZ |
6843 | int tracing_set_time_stamp_abs(struct trace_array *tr, bool abs) |
6844 | { | |
6845 | int ret = 0; | |
6846 | ||
6847 | mutex_lock(&trace_types_lock); | |
6848 | ||
6849 | if (abs && tr->time_stamp_abs_ref++) | |
6850 | goto out; | |
6851 | ||
6852 | if (!abs) { | |
6853 | if (WARN_ON_ONCE(!tr->time_stamp_abs_ref)) { | |
6854 | ret = -EINVAL; | |
6855 | goto out; | |
6856 | } | |
6857 | ||
6858 | if (--tr->time_stamp_abs_ref) | |
6859 | goto out; | |
6860 | } | |
6861 | ||
1c5eb448 | 6862 | ring_buffer_set_time_stamp_abs(tr->array_buffer.buffer, abs); |
00b41452 TZ |
6863 | |
6864 | #ifdef CONFIG_TRACER_MAX_TRACE | |
6865 | if (tr->max_buffer.buffer) | |
6866 | ring_buffer_set_time_stamp_abs(tr->max_buffer.buffer, abs); | |
6867 | #endif | |
6868 | out: | |
6869 | mutex_unlock(&trace_types_lock); | |
6870 | ||
6871 | return ret; | |
6872 | } | |
6873 | ||
6de58e62 SRRH |
6874 | struct ftrace_buffer_info { |
6875 | struct trace_iterator iter; | |
6876 | void *spare; | |
73a757e6 | 6877 | unsigned int spare_cpu; |
6de58e62 SRRH |
6878 | unsigned int read; |
6879 | }; | |
6880 | ||
debdd57f HT |
6881 | #ifdef CONFIG_TRACER_SNAPSHOT |
6882 | static int tracing_snapshot_open(struct inode *inode, struct file *file) | |
6883 | { | |
6484c71c | 6884 | struct trace_array *tr = inode->i_private; |
debdd57f | 6885 | struct trace_iterator *iter; |
2b6080f2 | 6886 | struct seq_file *m; |
8530dec6 | 6887 | int ret; |
debdd57f | 6888 | |
8530dec6 SRV |
6889 | ret = tracing_check_open_get_tr(tr); |
6890 | if (ret) | |
6891 | return ret; | |
ff451961 | 6892 | |
debdd57f | 6893 | if (file->f_mode & FMODE_READ) { |
6484c71c | 6894 | iter = __tracing_open(inode, file, true); |
debdd57f HT |
6895 | if (IS_ERR(iter)) |
6896 | ret = PTR_ERR(iter); | |
2b6080f2 SR |
6897 | } else { |
6898 | /* Writes still need the seq_file to hold the private data */ | |
f77d09a3 | 6899 | ret = -ENOMEM; |
2b6080f2 SR |
6900 | m = kzalloc(sizeof(*m), GFP_KERNEL); |
6901 | if (!m) | |
f77d09a3 | 6902 | goto out; |
2b6080f2 SR |
6903 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
6904 | if (!iter) { | |
6905 | kfree(m); | |
f77d09a3 | 6906 | goto out; |
2b6080f2 | 6907 | } |
f77d09a3 AL |
6908 | ret = 0; |
6909 | ||
ff451961 | 6910 | iter->tr = tr; |
1c5eb448 | 6911 | iter->array_buffer = &tr->max_buffer; |
6484c71c | 6912 | iter->cpu_file = tracing_get_cpu(inode); |
2b6080f2 SR |
6913 | m->private = iter; |
6914 | file->private_data = m; | |
debdd57f | 6915 | } |
f77d09a3 | 6916 | out: |
ff451961 SRRH |
6917 | if (ret < 0) |
6918 | trace_array_put(tr); | |
6919 | ||
debdd57f HT |
6920 | return ret; |
6921 | } | |
6922 | ||
6923 | static ssize_t | |
6924 | tracing_snapshot_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
6925 | loff_t *ppos) | |
6926 | { | |
2b6080f2 SR |
6927 | struct seq_file *m = filp->private_data; |
6928 | struct trace_iterator *iter = m->private; | |
6929 | struct trace_array *tr = iter->tr; | |
debdd57f HT |
6930 | unsigned long val; |
6931 | int ret; | |
6932 | ||
6933 | ret = tracing_update_buffers(); | |
6934 | if (ret < 0) | |
6935 | return ret; | |
6936 | ||
6937 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); | |
6938 | if (ret) | |
6939 | return ret; | |
6940 | ||
6941 | mutex_lock(&trace_types_lock); | |
6942 | ||
2b6080f2 | 6943 | if (tr->current_trace->use_max_tr) { |
debdd57f HT |
6944 | ret = -EBUSY; |
6945 | goto out; | |
6946 | } | |
6947 | ||
a35873a0 TZ |
6948 | arch_spin_lock(&tr->max_lock); |
6949 | if (tr->cond_snapshot) | |
6950 | ret = -EBUSY; | |
6951 | arch_spin_unlock(&tr->max_lock); | |
6952 | if (ret) | |
6953 | goto out; | |
6954 | ||
debdd57f HT |
6955 | switch (val) { |
6956 | case 0: | |
f1affcaa SRRH |
6957 | if (iter->cpu_file != RING_BUFFER_ALL_CPUS) { |
6958 | ret = -EINVAL; | |
6959 | break; | |
debdd57f | 6960 | } |
3209cff4 SRRH |
6961 | if (tr->allocated_snapshot) |
6962 | free_snapshot(tr); | |
debdd57f HT |
6963 | break; |
6964 | case 1: | |
f1affcaa SRRH |
6965 | /* Only allow per-cpu swap if the ring buffer supports it */ |
6966 | #ifndef CONFIG_RING_BUFFER_ALLOW_SWAP | |
6967 | if (iter->cpu_file != RING_BUFFER_ALL_CPUS) { | |
6968 | ret = -EINVAL; | |
6969 | break; | |
6970 | } | |
6971 | #endif | |
46cc0b44 ET |
6972 | if (tr->allocated_snapshot) |
6973 | ret = resize_buffer_duplicate_size(&tr->max_buffer, | |
1c5eb448 | 6974 | &tr->array_buffer, iter->cpu_file); |
46cc0b44 | 6975 | else |
2824f503 | 6976 | ret = tracing_alloc_snapshot_instance(tr); |
46cc0b44 ET |
6977 | if (ret < 0) |
6978 | break; | |
debdd57f HT |
6979 | local_irq_disable(); |
6980 | /* Now, we're going to swap */ | |
f1affcaa | 6981 | if (iter->cpu_file == RING_BUFFER_ALL_CPUS) |
a35873a0 | 6982 | update_max_tr(tr, current, smp_processor_id(), NULL); |
f1affcaa | 6983 | else |
ce9bae55 | 6984 | update_max_tr_single(tr, current, iter->cpu_file); |
debdd57f HT |
6985 | local_irq_enable(); |
6986 | break; | |
6987 | default: | |
45ad21ca | 6988 | if (tr->allocated_snapshot) { |
f1affcaa SRRH |
6989 | if (iter->cpu_file == RING_BUFFER_ALL_CPUS) |
6990 | tracing_reset_online_cpus(&tr->max_buffer); | |
6991 | else | |
a47b53e9 | 6992 | tracing_reset_cpu(&tr->max_buffer, iter->cpu_file); |
f1affcaa | 6993 | } |
debdd57f HT |
6994 | break; |
6995 | } | |
6996 | ||
6997 | if (ret >= 0) { | |
6998 | *ppos += cnt; | |
6999 | ret = cnt; | |
7000 | } | |
7001 | out: | |
7002 | mutex_unlock(&trace_types_lock); | |
7003 | return ret; | |
7004 | } | |
2b6080f2 SR |
7005 | |
7006 | static int tracing_snapshot_release(struct inode *inode, struct file *file) | |
7007 | { | |
7008 | struct seq_file *m = file->private_data; | |
ff451961 SRRH |
7009 | int ret; |
7010 | ||
7011 | ret = tracing_release(inode, file); | |
2b6080f2 SR |
7012 | |
7013 | if (file->f_mode & FMODE_READ) | |
ff451961 | 7014 | return ret; |
2b6080f2 SR |
7015 | |
7016 | /* If write only, the seq_file is just a stub */ | |
7017 | if (m) | |
7018 | kfree(m->private); | |
7019 | kfree(m); | |
7020 | ||
7021 | return 0; | |
7022 | } | |
7023 | ||
6de58e62 SRRH |
7024 | static int tracing_buffers_open(struct inode *inode, struct file *filp); |
7025 | static ssize_t tracing_buffers_read(struct file *filp, char __user *ubuf, | |
7026 | size_t count, loff_t *ppos); | |
7027 | static int tracing_buffers_release(struct inode *inode, struct file *file); | |
7028 | static ssize_t tracing_buffers_splice_read(struct file *file, loff_t *ppos, | |
7029 | struct pipe_inode_info *pipe, size_t len, unsigned int flags); | |
7030 | ||
7031 | static int snapshot_raw_open(struct inode *inode, struct file *filp) | |
7032 | { | |
7033 | struct ftrace_buffer_info *info; | |
7034 | int ret; | |
7035 | ||
17911ff3 | 7036 | /* The following checks for tracefs lockdown */ |
6de58e62 SRRH |
7037 | ret = tracing_buffers_open(inode, filp); |
7038 | if (ret < 0) | |
7039 | return ret; | |
7040 | ||
7041 | info = filp->private_data; | |
7042 | ||
7043 | if (info->iter.trace->use_max_tr) { | |
7044 | tracing_buffers_release(inode, filp); | |
7045 | return -EBUSY; | |
7046 | } | |
7047 | ||
7048 | info->iter.snapshot = true; | |
1c5eb448 | 7049 | info->iter.array_buffer = &info->iter.tr->max_buffer; |
6de58e62 SRRH |
7050 | |
7051 | return ret; | |
7052 | } | |
7053 | ||
debdd57f HT |
7054 | #endif /* CONFIG_TRACER_SNAPSHOT */ |
7055 | ||
7056 | ||
6508fa76 SF |
7057 | static const struct file_operations tracing_thresh_fops = { |
7058 | .open = tracing_open_generic, | |
7059 | .read = tracing_thresh_read, | |
7060 | .write = tracing_thresh_write, | |
7061 | .llseek = generic_file_llseek, | |
7062 | }; | |
7063 | ||
f971cc9a | 7064 | #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) |
5e2336a0 | 7065 | static const struct file_operations tracing_max_lat_fops = { |
4bf39a94 IM |
7066 | .open = tracing_open_generic, |
7067 | .read = tracing_max_lat_read, | |
7068 | .write = tracing_max_lat_write, | |
b444786f | 7069 | .llseek = generic_file_llseek, |
bc0c38d1 | 7070 | }; |
e428abbb | 7071 | #endif |
bc0c38d1 | 7072 | |
5e2336a0 | 7073 | static const struct file_operations set_tracer_fops = { |
4bf39a94 IM |
7074 | .open = tracing_open_generic, |
7075 | .read = tracing_set_trace_read, | |
7076 | .write = tracing_set_trace_write, | |
b444786f | 7077 | .llseek = generic_file_llseek, |
bc0c38d1 SR |
7078 | }; |
7079 | ||
5e2336a0 | 7080 | static const struct file_operations tracing_pipe_fops = { |
4bf39a94 | 7081 | .open = tracing_open_pipe, |
2a2cc8f7 | 7082 | .poll = tracing_poll_pipe, |
4bf39a94 | 7083 | .read = tracing_read_pipe, |
3c56819b | 7084 | .splice_read = tracing_splice_read_pipe, |
4bf39a94 | 7085 | .release = tracing_release_pipe, |
b444786f | 7086 | .llseek = no_llseek, |
b3806b43 SR |
7087 | }; |
7088 | ||
5e2336a0 | 7089 | static const struct file_operations tracing_entries_fops = { |
0bc392ee | 7090 | .open = tracing_open_generic_tr, |
a98a3c3f SR |
7091 | .read = tracing_entries_read, |
7092 | .write = tracing_entries_write, | |
b444786f | 7093 | .llseek = generic_file_llseek, |
0bc392ee | 7094 | .release = tracing_release_generic_tr, |
a98a3c3f SR |
7095 | }; |
7096 | ||
f81ab074 | 7097 | static const struct file_operations tracing_total_entries_fops = { |
7b85af63 | 7098 | .open = tracing_open_generic_tr, |
f81ab074 VN |
7099 | .read = tracing_total_entries_read, |
7100 | .llseek = generic_file_llseek, | |
7b85af63 | 7101 | .release = tracing_release_generic_tr, |
f81ab074 VN |
7102 | }; |
7103 | ||
4f271a2a | 7104 | static const struct file_operations tracing_free_buffer_fops = { |
7b85af63 | 7105 | .open = tracing_open_generic_tr, |
4f271a2a VN |
7106 | .write = tracing_free_buffer_write, |
7107 | .release = tracing_free_buffer_release, | |
7108 | }; | |
7109 | ||
5e2336a0 | 7110 | static const struct file_operations tracing_mark_fops = { |
7b85af63 | 7111 | .open = tracing_open_generic_tr, |
5bf9a1ee | 7112 | .write = tracing_mark_write, |
b444786f | 7113 | .llseek = generic_file_llseek, |
7b85af63 | 7114 | .release = tracing_release_generic_tr, |
5bf9a1ee PP |
7115 | }; |
7116 | ||
fa32e855 SR |
7117 | static const struct file_operations tracing_mark_raw_fops = { |
7118 | .open = tracing_open_generic_tr, | |
7119 | .write = tracing_mark_raw_write, | |
7120 | .llseek = generic_file_llseek, | |
7121 | .release = tracing_release_generic_tr, | |
7122 | }; | |
7123 | ||
5079f326 | 7124 | static const struct file_operations trace_clock_fops = { |
13f16d20 LZ |
7125 | .open = tracing_clock_open, |
7126 | .read = seq_read, | |
7127 | .llseek = seq_lseek, | |
7b85af63 | 7128 | .release = tracing_single_release_tr, |
5079f326 Z |
7129 | .write = tracing_clock_write, |
7130 | }; | |
7131 | ||
2c1ea60b TZ |
7132 | static const struct file_operations trace_time_stamp_mode_fops = { |
7133 | .open = tracing_time_stamp_mode_open, | |
7134 | .read = seq_read, | |
7135 | .llseek = seq_lseek, | |
7136 | .release = tracing_single_release_tr, | |
7137 | }; | |
7138 | ||
debdd57f HT |
7139 | #ifdef CONFIG_TRACER_SNAPSHOT |
7140 | static const struct file_operations snapshot_fops = { | |
7141 | .open = tracing_snapshot_open, | |
7142 | .read = seq_read, | |
7143 | .write = tracing_snapshot_write, | |
098c879e | 7144 | .llseek = tracing_lseek, |
2b6080f2 | 7145 | .release = tracing_snapshot_release, |
debdd57f | 7146 | }; |
debdd57f | 7147 | |
6de58e62 SRRH |
7148 | static const struct file_operations snapshot_raw_fops = { |
7149 | .open = snapshot_raw_open, | |
7150 | .read = tracing_buffers_read, | |
7151 | .release = tracing_buffers_release, | |
7152 | .splice_read = tracing_buffers_splice_read, | |
7153 | .llseek = no_llseek, | |
2cadf913 SR |
7154 | }; |
7155 | ||
6de58e62 SRRH |
7156 | #endif /* CONFIG_TRACER_SNAPSHOT */ |
7157 | ||
8a062902 TZ |
7158 | #define TRACING_LOG_ERRS_MAX 8 |
7159 | #define TRACING_LOG_LOC_MAX 128 | |
7160 | ||
7161 | #define CMD_PREFIX " Command: " | |
7162 | ||
7163 | struct err_info { | |
7164 | const char **errs; /* ptr to loc-specific array of err strings */ | |
7165 | u8 type; /* index into errs -> specific err string */ | |
7166 | u8 pos; /* MAX_FILTER_STR_VAL = 256 */ | |
7167 | u64 ts; | |
7168 | }; | |
7169 | ||
7170 | struct tracing_log_err { | |
7171 | struct list_head list; | |
7172 | struct err_info info; | |
7173 | char loc[TRACING_LOG_LOC_MAX]; /* err location */ | |
7174 | char cmd[MAX_FILTER_STR_VAL]; /* what caused err */ | |
7175 | }; | |
7176 | ||
8a062902 TZ |
7177 | static DEFINE_MUTEX(tracing_err_log_lock); |
7178 | ||
ff585c5b | 7179 | static struct tracing_log_err *get_tracing_log_err(struct trace_array *tr) |
8a062902 TZ |
7180 | { |
7181 | struct tracing_log_err *err; | |
7182 | ||
2f754e77 | 7183 | if (tr->n_err_log_entries < TRACING_LOG_ERRS_MAX) { |
8a062902 TZ |
7184 | err = kzalloc(sizeof(*err), GFP_KERNEL); |
7185 | if (!err) | |
7186 | err = ERR_PTR(-ENOMEM); | |
2f754e77 | 7187 | tr->n_err_log_entries++; |
8a062902 TZ |
7188 | |
7189 | return err; | |
7190 | } | |
7191 | ||
2f754e77 | 7192 | err = list_first_entry(&tr->err_log, struct tracing_log_err, list); |
8a062902 TZ |
7193 | list_del(&err->list); |
7194 | ||
7195 | return err; | |
7196 | } | |
7197 | ||
7198 | /** | |
7199 | * err_pos - find the position of a string within a command for error careting | |
7200 | * @cmd: The tracing command that caused the error | |
7201 | * @str: The string to position the caret at within @cmd | |
7202 | * | |
7203 | * Finds the position of the first occurence of @str within @cmd. The | |
7204 | * return value can be passed to tracing_log_err() for caret placement | |
7205 | * within @cmd. | |
7206 | * | |
7207 | * Returns the index within @cmd of the first occurence of @str or 0 | |
7208 | * if @str was not found. | |
7209 | */ | |
7210 | unsigned int err_pos(char *cmd, const char *str) | |
7211 | { | |
7212 | char *found; | |
7213 | ||
7214 | if (WARN_ON(!strlen(cmd))) | |
7215 | return 0; | |
7216 | ||
7217 | found = strstr(cmd, str); | |
7218 | if (found) | |
7219 | return found - cmd; | |
7220 | ||
7221 | return 0; | |
7222 | } | |
7223 | ||
7224 | /** | |
7225 | * tracing_log_err - write an error to the tracing error log | |
2f754e77 | 7226 | * @tr: The associated trace array for the error (NULL for top level array) |
8a062902 TZ |
7227 | * @loc: A string describing where the error occurred |
7228 | * @cmd: The tracing command that caused the error | |
7229 | * @errs: The array of loc-specific static error strings | |
7230 | * @type: The index into errs[], which produces the specific static err string | |
7231 | * @pos: The position the caret should be placed in the cmd | |
7232 | * | |
7233 | * Writes an error into tracing/error_log of the form: | |
7234 | * | |
7235 | * <loc>: error: <text> | |
7236 | * Command: <cmd> | |
7237 | * ^ | |
7238 | * | |
7239 | * tracing/error_log is a small log file containing the last | |
7240 | * TRACING_LOG_ERRS_MAX errors (8). Memory for errors isn't allocated | |
7241 | * unless there has been a tracing error, and the error log can be | |
7242 | * cleared and have its memory freed by writing the empty string in | |
7243 | * truncation mode to it i.e. echo > tracing/error_log. | |
7244 | * | |
7245 | * NOTE: the @errs array along with the @type param are used to | |
7246 | * produce a static error string - this string is not copied and saved | |
7247 | * when the error is logged - only a pointer to it is saved. See | |
7248 | * existing callers for examples of how static strings are typically | |
7249 | * defined for use with tracing_log_err(). | |
7250 | */ | |
2f754e77 SRV |
7251 | void tracing_log_err(struct trace_array *tr, |
7252 | const char *loc, const char *cmd, | |
8a062902 TZ |
7253 | const char **errs, u8 type, u8 pos) |
7254 | { | |
7255 | struct tracing_log_err *err; | |
7256 | ||
2f754e77 SRV |
7257 | if (!tr) |
7258 | tr = &global_trace; | |
7259 | ||
8a062902 | 7260 | mutex_lock(&tracing_err_log_lock); |
2f754e77 | 7261 | err = get_tracing_log_err(tr); |
8a062902 TZ |
7262 | if (PTR_ERR(err) == -ENOMEM) { |
7263 | mutex_unlock(&tracing_err_log_lock); | |
7264 | return; | |
7265 | } | |
7266 | ||
7267 | snprintf(err->loc, TRACING_LOG_LOC_MAX, "%s: error: ", loc); | |
7268 | snprintf(err->cmd, MAX_FILTER_STR_VAL,"\n" CMD_PREFIX "%s\n", cmd); | |
7269 | ||
7270 | err->info.errs = errs; | |
7271 | err->info.type = type; | |
7272 | err->info.pos = pos; | |
7273 | err->info.ts = local_clock(); | |
7274 | ||
2f754e77 | 7275 | list_add_tail(&err->list, &tr->err_log); |
8a062902 TZ |
7276 | mutex_unlock(&tracing_err_log_lock); |
7277 | } | |
7278 | ||
2f754e77 | 7279 | static void clear_tracing_err_log(struct trace_array *tr) |
8a062902 TZ |
7280 | { |
7281 | struct tracing_log_err *err, *next; | |
7282 | ||
7283 | mutex_lock(&tracing_err_log_lock); | |
2f754e77 | 7284 | list_for_each_entry_safe(err, next, &tr->err_log, list) { |
8a062902 TZ |
7285 | list_del(&err->list); |
7286 | kfree(err); | |
7287 | } | |
7288 | ||
2f754e77 | 7289 | tr->n_err_log_entries = 0; |
8a062902 TZ |
7290 | mutex_unlock(&tracing_err_log_lock); |
7291 | } | |
7292 | ||
7293 | static void *tracing_err_log_seq_start(struct seq_file *m, loff_t *pos) | |
7294 | { | |
2f754e77 SRV |
7295 | struct trace_array *tr = m->private; |
7296 | ||
8a062902 TZ |
7297 | mutex_lock(&tracing_err_log_lock); |
7298 | ||
2f754e77 | 7299 | return seq_list_start(&tr->err_log, *pos); |
8a062902 TZ |
7300 | } |
7301 | ||
7302 | static void *tracing_err_log_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
7303 | { | |
2f754e77 SRV |
7304 | struct trace_array *tr = m->private; |
7305 | ||
7306 | return seq_list_next(v, &tr->err_log, pos); | |
8a062902 TZ |
7307 | } |
7308 | ||
7309 | static void tracing_err_log_seq_stop(struct seq_file *m, void *v) | |
7310 | { | |
7311 | mutex_unlock(&tracing_err_log_lock); | |
7312 | } | |
7313 | ||
7314 | static void tracing_err_log_show_pos(struct seq_file *m, u8 pos) | |
7315 | { | |
7316 | u8 i; | |
7317 | ||
7318 | for (i = 0; i < sizeof(CMD_PREFIX) - 1; i++) | |
7319 | seq_putc(m, ' '); | |
7320 | for (i = 0; i < pos; i++) | |
7321 | seq_putc(m, ' '); | |
7322 | seq_puts(m, "^\n"); | |
7323 | } | |
7324 | ||
7325 | static int tracing_err_log_seq_show(struct seq_file *m, void *v) | |
7326 | { | |
7327 | struct tracing_log_err *err = v; | |
7328 | ||
7329 | if (err) { | |
7330 | const char *err_text = err->info.errs[err->info.type]; | |
7331 | u64 sec = err->info.ts; | |
7332 | u32 nsec; | |
7333 | ||
7334 | nsec = do_div(sec, NSEC_PER_SEC); | |
7335 | seq_printf(m, "[%5llu.%06u] %s%s", sec, nsec / 1000, | |
7336 | err->loc, err_text); | |
7337 | seq_printf(m, "%s", err->cmd); | |
7338 | tracing_err_log_show_pos(m, err->info.pos); | |
7339 | } | |
7340 | ||
7341 | return 0; | |
7342 | } | |
7343 | ||
7344 | static const struct seq_operations tracing_err_log_seq_ops = { | |
7345 | .start = tracing_err_log_seq_start, | |
7346 | .next = tracing_err_log_seq_next, | |
7347 | .stop = tracing_err_log_seq_stop, | |
7348 | .show = tracing_err_log_seq_show | |
7349 | }; | |
7350 | ||
7351 | static int tracing_err_log_open(struct inode *inode, struct file *file) | |
7352 | { | |
2f754e77 | 7353 | struct trace_array *tr = inode->i_private; |
8a062902 TZ |
7354 | int ret = 0; |
7355 | ||
8530dec6 SRV |
7356 | ret = tracing_check_open_get_tr(tr); |
7357 | if (ret) | |
7358 | return ret; | |
2f754e77 | 7359 | |
8a062902 TZ |
7360 | /* If this file was opened for write, then erase contents */ |
7361 | if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) | |
2f754e77 | 7362 | clear_tracing_err_log(tr); |
8a062902 | 7363 | |
2f754e77 | 7364 | if (file->f_mode & FMODE_READ) { |
8a062902 | 7365 | ret = seq_open(file, &tracing_err_log_seq_ops); |
2f754e77 SRV |
7366 | if (!ret) { |
7367 | struct seq_file *m = file->private_data; | |
7368 | m->private = tr; | |
7369 | } else { | |
7370 | trace_array_put(tr); | |
7371 | } | |
7372 | } | |
8a062902 TZ |
7373 | return ret; |
7374 | } | |
7375 | ||
7376 | static ssize_t tracing_err_log_write(struct file *file, | |
7377 | const char __user *buffer, | |
7378 | size_t count, loff_t *ppos) | |
7379 | { | |
7380 | return count; | |
7381 | } | |
7382 | ||
d122ed62 TM |
7383 | static int tracing_err_log_release(struct inode *inode, struct file *file) |
7384 | { | |
7385 | struct trace_array *tr = inode->i_private; | |
7386 | ||
7387 | trace_array_put(tr); | |
7388 | ||
7389 | if (file->f_mode & FMODE_READ) | |
7390 | seq_release(inode, file); | |
7391 | ||
7392 | return 0; | |
7393 | } | |
7394 | ||
8a062902 TZ |
7395 | static const struct file_operations tracing_err_log_fops = { |
7396 | .open = tracing_err_log_open, | |
7397 | .write = tracing_err_log_write, | |
7398 | .read = seq_read, | |
7399 | .llseek = seq_lseek, | |
d122ed62 | 7400 | .release = tracing_err_log_release, |
8a062902 TZ |
7401 | }; |
7402 | ||
2cadf913 SR |
7403 | static int tracing_buffers_open(struct inode *inode, struct file *filp) |
7404 | { | |
46ef2be0 | 7405 | struct trace_array *tr = inode->i_private; |
2cadf913 | 7406 | struct ftrace_buffer_info *info; |
7b85af63 | 7407 | int ret; |
2cadf913 | 7408 | |
8530dec6 SRV |
7409 | ret = tracing_check_open_get_tr(tr); |
7410 | if (ret) | |
7411 | return ret; | |
7b85af63 | 7412 | |
2cadf913 | 7413 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
7b85af63 SRRH |
7414 | if (!info) { |
7415 | trace_array_put(tr); | |
2cadf913 | 7416 | return -ENOMEM; |
7b85af63 | 7417 | } |
2cadf913 | 7418 | |
a695cb58 SRRH |
7419 | mutex_lock(&trace_types_lock); |
7420 | ||
cc60cdc9 | 7421 | info->iter.tr = tr; |
46ef2be0 | 7422 | info->iter.cpu_file = tracing_get_cpu(inode); |
b627344f | 7423 | info->iter.trace = tr->current_trace; |
1c5eb448 | 7424 | info->iter.array_buffer = &tr->array_buffer; |
cc60cdc9 | 7425 | info->spare = NULL; |
2cadf913 | 7426 | /* Force reading ring buffer for first read */ |
cc60cdc9 | 7427 | info->read = (unsigned int)-1; |
2cadf913 SR |
7428 | |
7429 | filp->private_data = info; | |
7430 | ||
cf6ab6d9 SRRH |
7431 | tr->current_trace->ref++; |
7432 | ||
a695cb58 SRRH |
7433 | mutex_unlock(&trace_types_lock); |
7434 | ||
7b85af63 SRRH |
7435 | ret = nonseekable_open(inode, filp); |
7436 | if (ret < 0) | |
7437 | trace_array_put(tr); | |
7438 | ||
7439 | return ret; | |
2cadf913 SR |
7440 | } |
7441 | ||
9dd95748 | 7442 | static __poll_t |
cc60cdc9 SR |
7443 | tracing_buffers_poll(struct file *filp, poll_table *poll_table) |
7444 | { | |
7445 | struct ftrace_buffer_info *info = filp->private_data; | |
7446 | struct trace_iterator *iter = &info->iter; | |
7447 | ||
7448 | return trace_poll(iter, filp, poll_table); | |
7449 | } | |
7450 | ||
2cadf913 SR |
7451 | static ssize_t |
7452 | tracing_buffers_read(struct file *filp, char __user *ubuf, | |
7453 | size_t count, loff_t *ppos) | |
7454 | { | |
7455 | struct ftrace_buffer_info *info = filp->private_data; | |
cc60cdc9 | 7456 | struct trace_iterator *iter = &info->iter; |
a7e52ad7 | 7457 | ssize_t ret = 0; |
6de58e62 | 7458 | ssize_t size; |
2cadf913 | 7459 | |
2dc5d12b SR |
7460 | if (!count) |
7461 | return 0; | |
7462 | ||
6de58e62 | 7463 | #ifdef CONFIG_TRACER_MAX_TRACE |
d716ff71 SRRH |
7464 | if (iter->snapshot && iter->tr->current_trace->use_max_tr) |
7465 | return -EBUSY; | |
6de58e62 SRRH |
7466 | #endif |
7467 | ||
73a757e6 | 7468 | if (!info->spare) { |
1c5eb448 | 7469 | info->spare = ring_buffer_alloc_read_page(iter->array_buffer->buffer, |
12883efb | 7470 | iter->cpu_file); |
a7e52ad7 SRV |
7471 | if (IS_ERR(info->spare)) { |
7472 | ret = PTR_ERR(info->spare); | |
7473 | info->spare = NULL; | |
7474 | } else { | |
7475 | info->spare_cpu = iter->cpu_file; | |
7476 | } | |
73a757e6 | 7477 | } |
ddd538f3 | 7478 | if (!info->spare) |
a7e52ad7 | 7479 | return ret; |
ddd538f3 | 7480 | |
2cadf913 SR |
7481 | /* Do we have previous read data to read? */ |
7482 | if (info->read < PAGE_SIZE) | |
7483 | goto read; | |
7484 | ||
b627344f | 7485 | again: |
cc60cdc9 | 7486 | trace_access_lock(iter->cpu_file); |
1c5eb448 | 7487 | ret = ring_buffer_read_page(iter->array_buffer->buffer, |
2cadf913 SR |
7488 | &info->spare, |
7489 | count, | |
cc60cdc9 SR |
7490 | iter->cpu_file, 0); |
7491 | trace_access_unlock(iter->cpu_file); | |
2cadf913 | 7492 | |
b627344f SR |
7493 | if (ret < 0) { |
7494 | if (trace_empty(iter)) { | |
d716ff71 SRRH |
7495 | if ((filp->f_flags & O_NONBLOCK)) |
7496 | return -EAGAIN; | |
7497 | ||
2c2b0a78 | 7498 | ret = wait_on_pipe(iter, 0); |
d716ff71 SRRH |
7499 | if (ret) |
7500 | return ret; | |
7501 | ||
b627344f SR |
7502 | goto again; |
7503 | } | |
d716ff71 | 7504 | return 0; |
b627344f | 7505 | } |
436fc280 | 7506 | |
436fc280 | 7507 | info->read = 0; |
b627344f | 7508 | read: |
2cadf913 SR |
7509 | size = PAGE_SIZE - info->read; |
7510 | if (size > count) | |
7511 | size = count; | |
7512 | ||
7513 | ret = copy_to_user(ubuf, info->spare + info->read, size); | |
d716ff71 SRRH |
7514 | if (ret == size) |
7515 | return -EFAULT; | |
7516 | ||
2dc5d12b SR |
7517 | size -= ret; |
7518 | ||
2cadf913 SR |
7519 | *ppos += size; |
7520 | info->read += size; | |
7521 | ||
7522 | return size; | |
7523 | } | |
7524 | ||
7525 | static int tracing_buffers_release(struct inode *inode, struct file *file) | |
7526 | { | |
7527 | struct ftrace_buffer_info *info = file->private_data; | |
cc60cdc9 | 7528 | struct trace_iterator *iter = &info->iter; |
2cadf913 | 7529 | |
a695cb58 SRRH |
7530 | mutex_lock(&trace_types_lock); |
7531 | ||
cf6ab6d9 SRRH |
7532 | iter->tr->current_trace->ref--; |
7533 | ||
ff451961 | 7534 | __trace_array_put(iter->tr); |
2cadf913 | 7535 | |
ddd538f3 | 7536 | if (info->spare) |
1c5eb448 | 7537 | ring_buffer_free_read_page(iter->array_buffer->buffer, |
73a757e6 | 7538 | info->spare_cpu, info->spare); |
2cadf913 SR |
7539 | kfree(info); |
7540 | ||
a695cb58 SRRH |
7541 | mutex_unlock(&trace_types_lock); |
7542 | ||
2cadf913 SR |
7543 | return 0; |
7544 | } | |
7545 | ||
7546 | struct buffer_ref { | |
13292494 | 7547 | struct trace_buffer *buffer; |
2cadf913 | 7548 | void *page; |
73a757e6 | 7549 | int cpu; |
b9872226 | 7550 | refcount_t refcount; |
2cadf913 SR |
7551 | }; |
7552 | ||
b9872226 JH |
7553 | static void buffer_ref_release(struct buffer_ref *ref) |
7554 | { | |
7555 | if (!refcount_dec_and_test(&ref->refcount)) | |
7556 | return; | |
7557 | ring_buffer_free_read_page(ref->buffer, ref->cpu, ref->page); | |
7558 | kfree(ref); | |
7559 | } | |
7560 | ||
2cadf913 SR |
7561 | static void buffer_pipe_buf_release(struct pipe_inode_info *pipe, |
7562 | struct pipe_buffer *buf) | |
7563 | { | |
7564 | struct buffer_ref *ref = (struct buffer_ref *)buf->private; | |
7565 | ||
b9872226 | 7566 | buffer_ref_release(ref); |
2cadf913 SR |
7567 | buf->private = 0; |
7568 | } | |
7569 | ||
15fab63e | 7570 | static bool buffer_pipe_buf_get(struct pipe_inode_info *pipe, |
2cadf913 SR |
7571 | struct pipe_buffer *buf) |
7572 | { | |
7573 | struct buffer_ref *ref = (struct buffer_ref *)buf->private; | |
7574 | ||
e9e1a2e7 | 7575 | if (refcount_read(&ref->refcount) > INT_MAX/2) |
15fab63e MW |
7576 | return false; |
7577 | ||
b9872226 | 7578 | refcount_inc(&ref->refcount); |
15fab63e | 7579 | return true; |
2cadf913 SR |
7580 | } |
7581 | ||
7582 | /* Pipe buffer operations for a buffer. */ | |
28dfef8f | 7583 | static const struct pipe_buf_operations buffer_pipe_buf_ops = { |
2cadf913 SR |
7584 | .confirm = generic_pipe_buf_confirm, |
7585 | .release = buffer_pipe_buf_release, | |
b9872226 | 7586 | .steal = generic_pipe_buf_nosteal, |
2cadf913 SR |
7587 | .get = buffer_pipe_buf_get, |
7588 | }; | |
7589 | ||
7590 | /* | |
7591 | * Callback from splice_to_pipe(), if we need to release some pages | |
7592 | * at the end of the spd in case we error'ed out in filling the pipe. | |
7593 | */ | |
7594 | static void buffer_spd_release(struct splice_pipe_desc *spd, unsigned int i) | |
7595 | { | |
7596 | struct buffer_ref *ref = | |
7597 | (struct buffer_ref *)spd->partial[i].private; | |
7598 | ||
b9872226 | 7599 | buffer_ref_release(ref); |
2cadf913 SR |
7600 | spd->partial[i].private = 0; |
7601 | } | |
7602 | ||
7603 | static ssize_t | |
7604 | tracing_buffers_splice_read(struct file *file, loff_t *ppos, | |
7605 | struct pipe_inode_info *pipe, size_t len, | |
7606 | unsigned int flags) | |
7607 | { | |
7608 | struct ftrace_buffer_info *info = file->private_data; | |
cc60cdc9 | 7609 | struct trace_iterator *iter = &info->iter; |
35f3d14d JA |
7610 | struct partial_page partial_def[PIPE_DEF_BUFFERS]; |
7611 | struct page *pages_def[PIPE_DEF_BUFFERS]; | |
2cadf913 | 7612 | struct splice_pipe_desc spd = { |
35f3d14d JA |
7613 | .pages = pages_def, |
7614 | .partial = partial_def, | |
047fe360 | 7615 | .nr_pages_max = PIPE_DEF_BUFFERS, |
2cadf913 SR |
7616 | .ops = &buffer_pipe_buf_ops, |
7617 | .spd_release = buffer_spd_release, | |
7618 | }; | |
7619 | struct buffer_ref *ref; | |
6b7e633f | 7620 | int entries, i; |
07906da7 | 7621 | ssize_t ret = 0; |
2cadf913 | 7622 | |
6de58e62 | 7623 | #ifdef CONFIG_TRACER_MAX_TRACE |
d716ff71 SRRH |
7624 | if (iter->snapshot && iter->tr->current_trace->use_max_tr) |
7625 | return -EBUSY; | |
6de58e62 SRRH |
7626 | #endif |
7627 | ||
d716ff71 SRRH |
7628 | if (*ppos & (PAGE_SIZE - 1)) |
7629 | return -EINVAL; | |
93cfb3c9 LJ |
7630 | |
7631 | if (len & (PAGE_SIZE - 1)) { | |
d716ff71 SRRH |
7632 | if (len < PAGE_SIZE) |
7633 | return -EINVAL; | |
93cfb3c9 LJ |
7634 | len &= PAGE_MASK; |
7635 | } | |
7636 | ||
1ae2293d AV |
7637 | if (splice_grow_spd(pipe, &spd)) |
7638 | return -ENOMEM; | |
7639 | ||
cc60cdc9 SR |
7640 | again: |
7641 | trace_access_lock(iter->cpu_file); | |
1c5eb448 | 7642 | entries = ring_buffer_entries_cpu(iter->array_buffer->buffer, iter->cpu_file); |
93459c6c | 7643 | |
a786c06d | 7644 | for (i = 0; i < spd.nr_pages_max && len && entries; i++, len -= PAGE_SIZE) { |
2cadf913 SR |
7645 | struct page *page; |
7646 | int r; | |
7647 | ||
7648 | ref = kzalloc(sizeof(*ref), GFP_KERNEL); | |
07906da7 RV |
7649 | if (!ref) { |
7650 | ret = -ENOMEM; | |
2cadf913 | 7651 | break; |
07906da7 | 7652 | } |
2cadf913 | 7653 | |
b9872226 | 7654 | refcount_set(&ref->refcount, 1); |
1c5eb448 | 7655 | ref->buffer = iter->array_buffer->buffer; |
cc60cdc9 | 7656 | ref->page = ring_buffer_alloc_read_page(ref->buffer, iter->cpu_file); |
a7e52ad7 SRV |
7657 | if (IS_ERR(ref->page)) { |
7658 | ret = PTR_ERR(ref->page); | |
7659 | ref->page = NULL; | |
2cadf913 SR |
7660 | kfree(ref); |
7661 | break; | |
7662 | } | |
73a757e6 | 7663 | ref->cpu = iter->cpu_file; |
2cadf913 SR |
7664 | |
7665 | r = ring_buffer_read_page(ref->buffer, &ref->page, | |
cc60cdc9 | 7666 | len, iter->cpu_file, 1); |
2cadf913 | 7667 | if (r < 0) { |
73a757e6 SRV |
7668 | ring_buffer_free_read_page(ref->buffer, ref->cpu, |
7669 | ref->page); | |
2cadf913 SR |
7670 | kfree(ref); |
7671 | break; | |
7672 | } | |
7673 | ||
2cadf913 SR |
7674 | page = virt_to_page(ref->page); |
7675 | ||
7676 | spd.pages[i] = page; | |
7677 | spd.partial[i].len = PAGE_SIZE; | |
7678 | spd.partial[i].offset = 0; | |
7679 | spd.partial[i].private = (unsigned long)ref; | |
7680 | spd.nr_pages++; | |
93cfb3c9 | 7681 | *ppos += PAGE_SIZE; |
93459c6c | 7682 | |
1c5eb448 | 7683 | entries = ring_buffer_entries_cpu(iter->array_buffer->buffer, iter->cpu_file); |
2cadf913 SR |
7684 | } |
7685 | ||
cc60cdc9 | 7686 | trace_access_unlock(iter->cpu_file); |
2cadf913 SR |
7687 | spd.nr_pages = i; |
7688 | ||
7689 | /* did we read anything? */ | |
7690 | if (!spd.nr_pages) { | |
07906da7 | 7691 | if (ret) |
1ae2293d | 7692 | goto out; |
d716ff71 | 7693 | |
1ae2293d | 7694 | ret = -EAGAIN; |
d716ff71 | 7695 | if ((file->f_flags & O_NONBLOCK) || (flags & SPLICE_F_NONBLOCK)) |
1ae2293d | 7696 | goto out; |
07906da7 | 7697 | |
03329f99 | 7698 | ret = wait_on_pipe(iter, iter->tr->buffer_percent); |
8b8b3683 | 7699 | if (ret) |
1ae2293d | 7700 | goto out; |
e30f53aa | 7701 | |
cc60cdc9 | 7702 | goto again; |
2cadf913 SR |
7703 | } |
7704 | ||
7705 | ret = splice_to_pipe(pipe, &spd); | |
1ae2293d | 7706 | out: |
047fe360 | 7707 | splice_shrink_spd(&spd); |
6de58e62 | 7708 | |
2cadf913 SR |
7709 | return ret; |
7710 | } | |
7711 | ||
7712 | static const struct file_operations tracing_buffers_fops = { | |
7713 | .open = tracing_buffers_open, | |
7714 | .read = tracing_buffers_read, | |
cc60cdc9 | 7715 | .poll = tracing_buffers_poll, |
2cadf913 SR |
7716 | .release = tracing_buffers_release, |
7717 | .splice_read = tracing_buffers_splice_read, | |
7718 | .llseek = no_llseek, | |
7719 | }; | |
7720 | ||
c8d77183 SR |
7721 | static ssize_t |
7722 | tracing_stats_read(struct file *filp, char __user *ubuf, | |
7723 | size_t count, loff_t *ppos) | |
7724 | { | |
4d3435b8 ON |
7725 | struct inode *inode = file_inode(filp); |
7726 | struct trace_array *tr = inode->i_private; | |
1c5eb448 | 7727 | struct array_buffer *trace_buf = &tr->array_buffer; |
4d3435b8 | 7728 | int cpu = tracing_get_cpu(inode); |
c8d77183 SR |
7729 | struct trace_seq *s; |
7730 | unsigned long cnt; | |
c64e148a VN |
7731 | unsigned long long t; |
7732 | unsigned long usec_rem; | |
c8d77183 | 7733 | |
e4f2d10f | 7734 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
c8d77183 | 7735 | if (!s) |
a646365c | 7736 | return -ENOMEM; |
c8d77183 SR |
7737 | |
7738 | trace_seq_init(s); | |
7739 | ||
12883efb | 7740 | cnt = ring_buffer_entries_cpu(trace_buf->buffer, cpu); |
c8d77183 SR |
7741 | trace_seq_printf(s, "entries: %ld\n", cnt); |
7742 | ||
12883efb | 7743 | cnt = ring_buffer_overrun_cpu(trace_buf->buffer, cpu); |
c8d77183 SR |
7744 | trace_seq_printf(s, "overrun: %ld\n", cnt); |
7745 | ||
12883efb | 7746 | cnt = ring_buffer_commit_overrun_cpu(trace_buf->buffer, cpu); |
c8d77183 SR |
7747 | trace_seq_printf(s, "commit overrun: %ld\n", cnt); |
7748 | ||
12883efb | 7749 | cnt = ring_buffer_bytes_cpu(trace_buf->buffer, cpu); |
c64e148a VN |
7750 | trace_seq_printf(s, "bytes: %ld\n", cnt); |
7751 | ||
58e8eedf | 7752 | if (trace_clocks[tr->clock_id].in_ns) { |
11043d8b | 7753 | /* local or global for trace_clock */ |
12883efb | 7754 | t = ns2usecs(ring_buffer_oldest_event_ts(trace_buf->buffer, cpu)); |
11043d8b YY |
7755 | usec_rem = do_div(t, USEC_PER_SEC); |
7756 | trace_seq_printf(s, "oldest event ts: %5llu.%06lu\n", | |
7757 | t, usec_rem); | |
7758 | ||
12883efb | 7759 | t = ns2usecs(ring_buffer_time_stamp(trace_buf->buffer, cpu)); |
11043d8b YY |
7760 | usec_rem = do_div(t, USEC_PER_SEC); |
7761 | trace_seq_printf(s, "now ts: %5llu.%06lu\n", t, usec_rem); | |
7762 | } else { | |
7763 | /* counter or tsc mode for trace_clock */ | |
7764 | trace_seq_printf(s, "oldest event ts: %llu\n", | |
12883efb | 7765 | ring_buffer_oldest_event_ts(trace_buf->buffer, cpu)); |
c64e148a | 7766 | |
11043d8b | 7767 | trace_seq_printf(s, "now ts: %llu\n", |
12883efb | 7768 | ring_buffer_time_stamp(trace_buf->buffer, cpu)); |
11043d8b | 7769 | } |
c64e148a | 7770 | |
12883efb | 7771 | cnt = ring_buffer_dropped_events_cpu(trace_buf->buffer, cpu); |
884bfe89 SP |
7772 | trace_seq_printf(s, "dropped events: %ld\n", cnt); |
7773 | ||
12883efb | 7774 | cnt = ring_buffer_read_events_cpu(trace_buf->buffer, cpu); |
ad964704 SRRH |
7775 | trace_seq_printf(s, "read events: %ld\n", cnt); |
7776 | ||
5ac48378 SRRH |
7777 | count = simple_read_from_buffer(ubuf, count, ppos, |
7778 | s->buffer, trace_seq_used(s)); | |
c8d77183 SR |
7779 | |
7780 | kfree(s); | |
7781 | ||
7782 | return count; | |
7783 | } | |
7784 | ||
7785 | static const struct file_operations tracing_stats_fops = { | |
4d3435b8 | 7786 | .open = tracing_open_generic_tr, |
c8d77183 | 7787 | .read = tracing_stats_read, |
b444786f | 7788 | .llseek = generic_file_llseek, |
4d3435b8 | 7789 | .release = tracing_release_generic_tr, |
c8d77183 SR |
7790 | }; |
7791 | ||
bc0c38d1 SR |
7792 | #ifdef CONFIG_DYNAMIC_FTRACE |
7793 | ||
7794 | static ssize_t | |
b807c3d0 | 7795 | tracing_read_dyn_info(struct file *filp, char __user *ubuf, |
bc0c38d1 SR |
7796 | size_t cnt, loff_t *ppos) |
7797 | { | |
da537f0a SRV |
7798 | ssize_t ret; |
7799 | char *buf; | |
bc0c38d1 SR |
7800 | int r; |
7801 | ||
da537f0a SRV |
7802 | /* 256 should be plenty to hold the amount needed */ |
7803 | buf = kmalloc(256, GFP_KERNEL); | |
7804 | if (!buf) | |
7805 | return -ENOMEM; | |
b807c3d0 | 7806 | |
da537f0a SRV |
7807 | r = scnprintf(buf, 256, "%ld pages:%ld groups: %ld\n", |
7808 | ftrace_update_tot_cnt, | |
7809 | ftrace_number_of_pages, | |
7810 | ftrace_number_of_groups); | |
7811 | ||
7812 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
7813 | kfree(buf); | |
7814 | return ret; | |
bc0c38d1 SR |
7815 | } |
7816 | ||
5e2336a0 | 7817 | static const struct file_operations tracing_dyn_info_fops = { |
4bf39a94 | 7818 | .open = tracing_open_generic, |
b807c3d0 | 7819 | .read = tracing_read_dyn_info, |
b444786f | 7820 | .llseek = generic_file_llseek, |
bc0c38d1 | 7821 | }; |
77fd5c15 | 7822 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
bc0c38d1 | 7823 | |
77fd5c15 SRRH |
7824 | #if defined(CONFIG_TRACER_SNAPSHOT) && defined(CONFIG_DYNAMIC_FTRACE) |
7825 | static void | |
bca6c8d0 | 7826 | ftrace_snapshot(unsigned long ip, unsigned long parent_ip, |
b5f081b5 | 7827 | struct trace_array *tr, struct ftrace_probe_ops *ops, |
6e444319 | 7828 | void *data) |
77fd5c15 | 7829 | { |
cab50379 | 7830 | tracing_snapshot_instance(tr); |
77fd5c15 | 7831 | } |
bc0c38d1 | 7832 | |
77fd5c15 | 7833 | static void |
bca6c8d0 | 7834 | ftrace_count_snapshot(unsigned long ip, unsigned long parent_ip, |
b5f081b5 | 7835 | struct trace_array *tr, struct ftrace_probe_ops *ops, |
6e444319 | 7836 | void *data) |
bc0c38d1 | 7837 | { |
6e444319 | 7838 | struct ftrace_func_mapper *mapper = data; |
1a93f8bd | 7839 | long *count = NULL; |
77fd5c15 | 7840 | |
1a93f8bd SRV |
7841 | if (mapper) |
7842 | count = (long *)ftrace_func_mapper_find_ip(mapper, ip); | |
7843 | ||
7844 | if (count) { | |
7845 | ||
7846 | if (*count <= 0) | |
7847 | return; | |
bc0c38d1 | 7848 | |
77fd5c15 | 7849 | (*count)--; |
1a93f8bd | 7850 | } |
77fd5c15 | 7851 | |
cab50379 | 7852 | tracing_snapshot_instance(tr); |
77fd5c15 SRRH |
7853 | } |
7854 | ||
7855 | static int | |
7856 | ftrace_snapshot_print(struct seq_file *m, unsigned long ip, | |
7857 | struct ftrace_probe_ops *ops, void *data) | |
7858 | { | |
6e444319 | 7859 | struct ftrace_func_mapper *mapper = data; |
1a93f8bd | 7860 | long *count = NULL; |
77fd5c15 SRRH |
7861 | |
7862 | seq_printf(m, "%ps:", (void *)ip); | |
7863 | ||
fa6f0cc7 | 7864 | seq_puts(m, "snapshot"); |
77fd5c15 | 7865 | |
1a93f8bd SRV |
7866 | if (mapper) |
7867 | count = (long *)ftrace_func_mapper_find_ip(mapper, ip); | |
7868 | ||
7869 | if (count) | |
7870 | seq_printf(m, ":count=%ld\n", *count); | |
77fd5c15 | 7871 | else |
1a93f8bd | 7872 | seq_puts(m, ":unlimited\n"); |
77fd5c15 SRRH |
7873 | |
7874 | return 0; | |
7875 | } | |
7876 | ||
1a93f8bd | 7877 | static int |
b5f081b5 | 7878 | ftrace_snapshot_init(struct ftrace_probe_ops *ops, struct trace_array *tr, |
6e444319 | 7879 | unsigned long ip, void *init_data, void **data) |
1a93f8bd | 7880 | { |
6e444319 SRV |
7881 | struct ftrace_func_mapper *mapper = *data; |
7882 | ||
7883 | if (!mapper) { | |
7884 | mapper = allocate_ftrace_func_mapper(); | |
7885 | if (!mapper) | |
7886 | return -ENOMEM; | |
7887 | *data = mapper; | |
7888 | } | |
1a93f8bd | 7889 | |
6e444319 | 7890 | return ftrace_func_mapper_add_ip(mapper, ip, init_data); |
1a93f8bd SRV |
7891 | } |
7892 | ||
7893 | static void | |
b5f081b5 | 7894 | ftrace_snapshot_free(struct ftrace_probe_ops *ops, struct trace_array *tr, |
6e444319 | 7895 | unsigned long ip, void *data) |
1a93f8bd | 7896 | { |
6e444319 SRV |
7897 | struct ftrace_func_mapper *mapper = data; |
7898 | ||
7899 | if (!ip) { | |
7900 | if (!mapper) | |
7901 | return; | |
7902 | free_ftrace_func_mapper(mapper, NULL); | |
7903 | return; | |
7904 | } | |
1a93f8bd SRV |
7905 | |
7906 | ftrace_func_mapper_remove_ip(mapper, ip); | |
7907 | } | |
7908 | ||
77fd5c15 SRRH |
7909 | static struct ftrace_probe_ops snapshot_probe_ops = { |
7910 | .func = ftrace_snapshot, | |
7911 | .print = ftrace_snapshot_print, | |
7912 | }; | |
7913 | ||
7914 | static struct ftrace_probe_ops snapshot_count_probe_ops = { | |
7915 | .func = ftrace_count_snapshot, | |
7916 | .print = ftrace_snapshot_print, | |
1a93f8bd SRV |
7917 | .init = ftrace_snapshot_init, |
7918 | .free = ftrace_snapshot_free, | |
77fd5c15 SRRH |
7919 | }; |
7920 | ||
7921 | static int | |
04ec7bb6 | 7922 | ftrace_trace_snapshot_callback(struct trace_array *tr, struct ftrace_hash *hash, |
77fd5c15 SRRH |
7923 | char *glob, char *cmd, char *param, int enable) |
7924 | { | |
7925 | struct ftrace_probe_ops *ops; | |
7926 | void *count = (void *)-1; | |
7927 | char *number; | |
7928 | int ret; | |
7929 | ||
0f179765 SRV |
7930 | if (!tr) |
7931 | return -ENODEV; | |
7932 | ||
77fd5c15 SRRH |
7933 | /* hash funcs only work with set_ftrace_filter */ |
7934 | if (!enable) | |
7935 | return -EINVAL; | |
7936 | ||
7937 | ops = param ? &snapshot_count_probe_ops : &snapshot_probe_ops; | |
7938 | ||
d3d532d7 | 7939 | if (glob[0] == '!') |
7b60f3d8 | 7940 | return unregister_ftrace_function_probe_func(glob+1, tr, ops); |
77fd5c15 SRRH |
7941 | |
7942 | if (!param) | |
7943 | goto out_reg; | |
7944 | ||
7945 | number = strsep(¶m, ":"); | |
7946 | ||
7947 | if (!strlen(number)) | |
7948 | goto out_reg; | |
7949 | ||
7950 | /* | |
7951 | * We use the callback data field (which is a pointer) | |
7952 | * as our counter. | |
7953 | */ | |
7954 | ret = kstrtoul(number, 0, (unsigned long *)&count); | |
7955 | if (ret) | |
7956 | return ret; | |
7957 | ||
7958 | out_reg: | |
2824f503 | 7959 | ret = tracing_alloc_snapshot_instance(tr); |
df62db5b SRV |
7960 | if (ret < 0) |
7961 | goto out; | |
77fd5c15 | 7962 | |
4c174688 | 7963 | ret = register_ftrace_function_probe(glob, tr, ops, count); |
77fd5c15 | 7964 | |
df62db5b | 7965 | out: |
77fd5c15 SRRH |
7966 | return ret < 0 ? ret : 0; |
7967 | } | |
7968 | ||
7969 | static struct ftrace_func_command ftrace_snapshot_cmd = { | |
7970 | .name = "snapshot", | |
7971 | .func = ftrace_trace_snapshot_callback, | |
7972 | }; | |
7973 | ||
38de93ab | 7974 | static __init int register_snapshot_cmd(void) |
77fd5c15 SRRH |
7975 | { |
7976 | return register_ftrace_command(&ftrace_snapshot_cmd); | |
7977 | } | |
7978 | #else | |
38de93ab | 7979 | static inline __init int register_snapshot_cmd(void) { return 0; } |
77fd5c15 | 7980 | #endif /* defined(CONFIG_TRACER_SNAPSHOT) && defined(CONFIG_DYNAMIC_FTRACE) */ |
bc0c38d1 | 7981 | |
7eeafbca | 7982 | static struct dentry *tracing_get_dentry(struct trace_array *tr) |
bc0c38d1 | 7983 | { |
8434dc93 SRRH |
7984 | if (WARN_ON(!tr->dir)) |
7985 | return ERR_PTR(-ENODEV); | |
7986 | ||
7987 | /* Top directory uses NULL as the parent */ | |
7988 | if (tr->flags & TRACE_ARRAY_FL_GLOBAL) | |
7989 | return NULL; | |
7990 | ||
7991 | /* All sub buffers have a descriptor */ | |
2b6080f2 | 7992 | return tr->dir; |
bc0c38d1 SR |
7993 | } |
7994 | ||
2b6080f2 | 7995 | static struct dentry *tracing_dentry_percpu(struct trace_array *tr, int cpu) |
b04cc6b1 | 7996 | { |
b04cc6b1 FW |
7997 | struct dentry *d_tracer; |
7998 | ||
2b6080f2 SR |
7999 | if (tr->percpu_dir) |
8000 | return tr->percpu_dir; | |
b04cc6b1 | 8001 | |
7eeafbca | 8002 | d_tracer = tracing_get_dentry(tr); |
14a5ae40 | 8003 | if (IS_ERR(d_tracer)) |
b04cc6b1 FW |
8004 | return NULL; |
8005 | ||
8434dc93 | 8006 | tr->percpu_dir = tracefs_create_dir("per_cpu", d_tracer); |
b04cc6b1 | 8007 | |
24589e3a | 8008 | MEM_FAIL(!tr->percpu_dir, |
8434dc93 | 8009 | "Could not create tracefs directory 'per_cpu/%d'\n", cpu); |
b04cc6b1 | 8010 | |
2b6080f2 | 8011 | return tr->percpu_dir; |
b04cc6b1 FW |
8012 | } |
8013 | ||
649e9c70 ON |
8014 | static struct dentry * |
8015 | trace_create_cpu_file(const char *name, umode_t mode, struct dentry *parent, | |
8016 | void *data, long cpu, const struct file_operations *fops) | |
8017 | { | |
8018 | struct dentry *ret = trace_create_file(name, mode, parent, data, fops); | |
8019 | ||
8020 | if (ret) /* See tracing_get_cpu() */ | |
7682c918 | 8021 | d_inode(ret)->i_cdev = (void *)(cpu + 1); |
649e9c70 ON |
8022 | return ret; |
8023 | } | |
8024 | ||
2b6080f2 | 8025 | static void |
8434dc93 | 8026 | tracing_init_tracefs_percpu(struct trace_array *tr, long cpu) |
b04cc6b1 | 8027 | { |
2b6080f2 | 8028 | struct dentry *d_percpu = tracing_dentry_percpu(tr, cpu); |
5452af66 | 8029 | struct dentry *d_cpu; |
dd49a38c | 8030 | char cpu_dir[30]; /* 30 characters should be more than enough */ |
b04cc6b1 | 8031 | |
0a3d7ce7 NK |
8032 | if (!d_percpu) |
8033 | return; | |
8034 | ||
dd49a38c | 8035 | snprintf(cpu_dir, 30, "cpu%ld", cpu); |
8434dc93 | 8036 | d_cpu = tracefs_create_dir(cpu_dir, d_percpu); |
8656e7a2 | 8037 | if (!d_cpu) { |
a395d6a7 | 8038 | pr_warn("Could not create tracefs '%s' entry\n", cpu_dir); |
8656e7a2 FW |
8039 | return; |
8040 | } | |
b04cc6b1 | 8041 | |
8656e7a2 | 8042 | /* per cpu trace_pipe */ |
649e9c70 | 8043 | trace_create_cpu_file("trace_pipe", 0444, d_cpu, |
15544209 | 8044 | tr, cpu, &tracing_pipe_fops); |
b04cc6b1 FW |
8045 | |
8046 | /* per cpu trace */ | |
649e9c70 | 8047 | trace_create_cpu_file("trace", 0644, d_cpu, |
6484c71c | 8048 | tr, cpu, &tracing_fops); |
7f96f93f | 8049 | |
649e9c70 | 8050 | trace_create_cpu_file("trace_pipe_raw", 0444, d_cpu, |
46ef2be0 | 8051 | tr, cpu, &tracing_buffers_fops); |
7f96f93f | 8052 | |
649e9c70 | 8053 | trace_create_cpu_file("stats", 0444, d_cpu, |
4d3435b8 | 8054 | tr, cpu, &tracing_stats_fops); |
438ced17 | 8055 | |
649e9c70 | 8056 | trace_create_cpu_file("buffer_size_kb", 0444, d_cpu, |
0bc392ee | 8057 | tr, cpu, &tracing_entries_fops); |
f1affcaa SRRH |
8058 | |
8059 | #ifdef CONFIG_TRACER_SNAPSHOT | |
649e9c70 | 8060 | trace_create_cpu_file("snapshot", 0644, d_cpu, |
6484c71c | 8061 | tr, cpu, &snapshot_fops); |
6de58e62 | 8062 | |
649e9c70 | 8063 | trace_create_cpu_file("snapshot_raw", 0444, d_cpu, |
46ef2be0 | 8064 | tr, cpu, &snapshot_raw_fops); |
f1affcaa | 8065 | #endif |
b04cc6b1 FW |
8066 | } |
8067 | ||
60a11774 SR |
8068 | #ifdef CONFIG_FTRACE_SELFTEST |
8069 | /* Let selftest have access to static functions in this file */ | |
8070 | #include "trace_selftest.c" | |
8071 | #endif | |
8072 | ||
577b785f SR |
8073 | static ssize_t |
8074 | trace_options_read(struct file *filp, char __user *ubuf, size_t cnt, | |
8075 | loff_t *ppos) | |
8076 | { | |
8077 | struct trace_option_dentry *topt = filp->private_data; | |
8078 | char *buf; | |
8079 | ||
8080 | if (topt->flags->val & topt->opt->bit) | |
8081 | buf = "1\n"; | |
8082 | else | |
8083 | buf = "0\n"; | |
8084 | ||
8085 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
8086 | } | |
8087 | ||
8088 | static ssize_t | |
8089 | trace_options_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
8090 | loff_t *ppos) | |
8091 | { | |
8092 | struct trace_option_dentry *topt = filp->private_data; | |
8093 | unsigned long val; | |
577b785f SR |
8094 | int ret; |
8095 | ||
22fe9b54 PH |
8096 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
8097 | if (ret) | |
577b785f SR |
8098 | return ret; |
8099 | ||
8d18eaaf LZ |
8100 | if (val != 0 && val != 1) |
8101 | return -EINVAL; | |
577b785f | 8102 | |
8d18eaaf | 8103 | if (!!(topt->flags->val & topt->opt->bit) != val) { |
577b785f | 8104 | mutex_lock(&trace_types_lock); |
8c1a49ae | 8105 | ret = __set_tracer_option(topt->tr, topt->flags, |
c757bea9 | 8106 | topt->opt, !val); |
577b785f SR |
8107 | mutex_unlock(&trace_types_lock); |
8108 | if (ret) | |
8109 | return ret; | |
577b785f SR |
8110 | } |
8111 | ||
8112 | *ppos += cnt; | |
8113 | ||
8114 | return cnt; | |
8115 | } | |
8116 | ||
8117 | ||
8118 | static const struct file_operations trace_options_fops = { | |
8119 | .open = tracing_open_generic, | |
8120 | .read = trace_options_read, | |
8121 | .write = trace_options_write, | |
b444786f | 8122 | .llseek = generic_file_llseek, |
577b785f SR |
8123 | }; |
8124 | ||
9a38a885 SRRH |
8125 | /* |
8126 | * In order to pass in both the trace_array descriptor as well as the index | |
8127 | * to the flag that the trace option file represents, the trace_array | |
8128 | * has a character array of trace_flags_index[], which holds the index | |
8129 | * of the bit for the flag it represents. index[0] == 0, index[1] == 1, etc. | |
8130 | * The address of this character array is passed to the flag option file | |
8131 | * read/write callbacks. | |
8132 | * | |
8133 | * In order to extract both the index and the trace_array descriptor, | |
8134 | * get_tr_index() uses the following algorithm. | |
8135 | * | |
8136 | * idx = *ptr; | |
8137 | * | |
8138 | * As the pointer itself contains the address of the index (remember | |
8139 | * index[1] == 1). | |
8140 | * | |
8141 | * Then to get the trace_array descriptor, by subtracting that index | |
8142 | * from the ptr, we get to the start of the index itself. | |
8143 | * | |
8144 | * ptr - idx == &index[0] | |
8145 | * | |
8146 | * Then a simple container_of() from that pointer gets us to the | |
8147 | * trace_array descriptor. | |
8148 | */ | |
8149 | static void get_tr_index(void *data, struct trace_array **ptr, | |
8150 | unsigned int *pindex) | |
8151 | { | |
8152 | *pindex = *(unsigned char *)data; | |
8153 | ||
8154 | *ptr = container_of(data - *pindex, struct trace_array, | |
8155 | trace_flags_index); | |
8156 | } | |
8157 | ||
a8259075 SR |
8158 | static ssize_t |
8159 | trace_options_core_read(struct file *filp, char __user *ubuf, size_t cnt, | |
8160 | loff_t *ppos) | |
8161 | { | |
9a38a885 SRRH |
8162 | void *tr_index = filp->private_data; |
8163 | struct trace_array *tr; | |
8164 | unsigned int index; | |
a8259075 SR |
8165 | char *buf; |
8166 | ||
9a38a885 SRRH |
8167 | get_tr_index(tr_index, &tr, &index); |
8168 | ||
8169 | if (tr->trace_flags & (1 << index)) | |
a8259075 SR |
8170 | buf = "1\n"; |
8171 | else | |
8172 | buf = "0\n"; | |
8173 | ||
8174 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
8175 | } | |
8176 | ||
8177 | static ssize_t | |
8178 | trace_options_core_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
8179 | loff_t *ppos) | |
8180 | { | |
9a38a885 SRRH |
8181 | void *tr_index = filp->private_data; |
8182 | struct trace_array *tr; | |
8183 | unsigned int index; | |
a8259075 SR |
8184 | unsigned long val; |
8185 | int ret; | |
8186 | ||
9a38a885 SRRH |
8187 | get_tr_index(tr_index, &tr, &index); |
8188 | ||
22fe9b54 PH |
8189 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
8190 | if (ret) | |
a8259075 SR |
8191 | return ret; |
8192 | ||
f2d84b65 | 8193 | if (val != 0 && val != 1) |
a8259075 | 8194 | return -EINVAL; |
69d34da2 | 8195 | |
3a53acf1 | 8196 | mutex_lock(&event_mutex); |
69d34da2 | 8197 | mutex_lock(&trace_types_lock); |
2b6080f2 | 8198 | ret = set_tracer_flag(tr, 1 << index, val); |
69d34da2 | 8199 | mutex_unlock(&trace_types_lock); |
3a53acf1 | 8200 | mutex_unlock(&event_mutex); |
a8259075 | 8201 | |
613f04a0 SRRH |
8202 | if (ret < 0) |
8203 | return ret; | |
8204 | ||
a8259075 SR |
8205 | *ppos += cnt; |
8206 | ||
8207 | return cnt; | |
8208 | } | |
8209 | ||
a8259075 SR |
8210 | static const struct file_operations trace_options_core_fops = { |
8211 | .open = tracing_open_generic, | |
8212 | .read = trace_options_core_read, | |
8213 | .write = trace_options_core_write, | |
b444786f | 8214 | .llseek = generic_file_llseek, |
a8259075 SR |
8215 | }; |
8216 | ||
5452af66 | 8217 | struct dentry *trace_create_file(const char *name, |
f4ae40a6 | 8218 | umode_t mode, |
5452af66 FW |
8219 | struct dentry *parent, |
8220 | void *data, | |
8221 | const struct file_operations *fops) | |
8222 | { | |
8223 | struct dentry *ret; | |
8224 | ||
8434dc93 | 8225 | ret = tracefs_create_file(name, mode, parent, data, fops); |
5452af66 | 8226 | if (!ret) |
a395d6a7 | 8227 | pr_warn("Could not create tracefs '%s' entry\n", name); |
5452af66 FW |
8228 | |
8229 | return ret; | |
8230 | } | |
8231 | ||
8232 | ||
2b6080f2 | 8233 | static struct dentry *trace_options_init_dentry(struct trace_array *tr) |
a8259075 SR |
8234 | { |
8235 | struct dentry *d_tracer; | |
a8259075 | 8236 | |
2b6080f2 SR |
8237 | if (tr->options) |
8238 | return tr->options; | |
a8259075 | 8239 | |
7eeafbca | 8240 | d_tracer = tracing_get_dentry(tr); |
14a5ae40 | 8241 | if (IS_ERR(d_tracer)) |
a8259075 SR |
8242 | return NULL; |
8243 | ||
8434dc93 | 8244 | tr->options = tracefs_create_dir("options", d_tracer); |
2b6080f2 | 8245 | if (!tr->options) { |
a395d6a7 | 8246 | pr_warn("Could not create tracefs directory 'options'\n"); |
a8259075 SR |
8247 | return NULL; |
8248 | } | |
8249 | ||
2b6080f2 | 8250 | return tr->options; |
a8259075 SR |
8251 | } |
8252 | ||
577b785f | 8253 | static void |
2b6080f2 SR |
8254 | create_trace_option_file(struct trace_array *tr, |
8255 | struct trace_option_dentry *topt, | |
577b785f SR |
8256 | struct tracer_flags *flags, |
8257 | struct tracer_opt *opt) | |
8258 | { | |
8259 | struct dentry *t_options; | |
577b785f | 8260 | |
2b6080f2 | 8261 | t_options = trace_options_init_dentry(tr); |
577b785f SR |
8262 | if (!t_options) |
8263 | return; | |
8264 | ||
8265 | topt->flags = flags; | |
8266 | topt->opt = opt; | |
2b6080f2 | 8267 | topt->tr = tr; |
577b785f | 8268 | |
5452af66 | 8269 | topt->entry = trace_create_file(opt->name, 0644, t_options, topt, |
577b785f SR |
8270 | &trace_options_fops); |
8271 | ||
577b785f SR |
8272 | } |
8273 | ||
37aea98b | 8274 | static void |
2b6080f2 | 8275 | create_trace_option_files(struct trace_array *tr, struct tracer *tracer) |
577b785f SR |
8276 | { |
8277 | struct trace_option_dentry *topts; | |
37aea98b | 8278 | struct trace_options *tr_topts; |
577b785f SR |
8279 | struct tracer_flags *flags; |
8280 | struct tracer_opt *opts; | |
8281 | int cnt; | |
37aea98b | 8282 | int i; |
577b785f SR |
8283 | |
8284 | if (!tracer) | |
37aea98b | 8285 | return; |
577b785f SR |
8286 | |
8287 | flags = tracer->flags; | |
8288 | ||
8289 | if (!flags || !flags->opts) | |
37aea98b SRRH |
8290 | return; |
8291 | ||
8292 | /* | |
8293 | * If this is an instance, only create flags for tracers | |
8294 | * the instance may have. | |
8295 | */ | |
8296 | if (!trace_ok_for_array(tracer, tr)) | |
8297 | return; | |
8298 | ||
8299 | for (i = 0; i < tr->nr_topts; i++) { | |
d39cdd20 CH |
8300 | /* Make sure there's no duplicate flags. */ |
8301 | if (WARN_ON_ONCE(tr->topts[i].tracer->flags == tracer->flags)) | |
37aea98b SRRH |
8302 | return; |
8303 | } | |
577b785f SR |
8304 | |
8305 | opts = flags->opts; | |
8306 | ||
8307 | for (cnt = 0; opts[cnt].name; cnt++) | |
8308 | ; | |
8309 | ||
0cfe8245 | 8310 | topts = kcalloc(cnt + 1, sizeof(*topts), GFP_KERNEL); |
577b785f | 8311 | if (!topts) |
37aea98b SRRH |
8312 | return; |
8313 | ||
8314 | tr_topts = krealloc(tr->topts, sizeof(*tr->topts) * (tr->nr_topts + 1), | |
8315 | GFP_KERNEL); | |
8316 | if (!tr_topts) { | |
8317 | kfree(topts); | |
8318 | return; | |
8319 | } | |
8320 | ||
8321 | tr->topts = tr_topts; | |
8322 | tr->topts[tr->nr_topts].tracer = tracer; | |
8323 | tr->topts[tr->nr_topts].topts = topts; | |
8324 | tr->nr_topts++; | |
577b785f | 8325 | |
41d9c0be | 8326 | for (cnt = 0; opts[cnt].name; cnt++) { |
2b6080f2 | 8327 | create_trace_option_file(tr, &topts[cnt], flags, |
577b785f | 8328 | &opts[cnt]); |
24589e3a | 8329 | MEM_FAIL(topts[cnt].entry == NULL, |
41d9c0be SRRH |
8330 | "Failed to create trace option: %s", |
8331 | opts[cnt].name); | |
8332 | } | |
577b785f SR |
8333 | } |
8334 | ||
a8259075 | 8335 | static struct dentry * |
2b6080f2 SR |
8336 | create_trace_option_core_file(struct trace_array *tr, |
8337 | const char *option, long index) | |
a8259075 SR |
8338 | { |
8339 | struct dentry *t_options; | |
a8259075 | 8340 | |
2b6080f2 | 8341 | t_options = trace_options_init_dentry(tr); |
a8259075 SR |
8342 | if (!t_options) |
8343 | return NULL; | |
8344 | ||
9a38a885 SRRH |
8345 | return trace_create_file(option, 0644, t_options, |
8346 | (void *)&tr->trace_flags_index[index], | |
8347 | &trace_options_core_fops); | |
a8259075 SR |
8348 | } |
8349 | ||
16270145 | 8350 | static void create_trace_options_dir(struct trace_array *tr) |
a8259075 SR |
8351 | { |
8352 | struct dentry *t_options; | |
16270145 | 8353 | bool top_level = tr == &global_trace; |
a8259075 SR |
8354 | int i; |
8355 | ||
2b6080f2 | 8356 | t_options = trace_options_init_dentry(tr); |
a8259075 SR |
8357 | if (!t_options) |
8358 | return; | |
8359 | ||
16270145 SRRH |
8360 | for (i = 0; trace_options[i]; i++) { |
8361 | if (top_level || | |
8362 | !((1 << i) & TOP_LEVEL_TRACE_FLAGS)) | |
8363 | create_trace_option_core_file(tr, trace_options[i], i); | |
8364 | } | |
a8259075 SR |
8365 | } |
8366 | ||
499e5470 SR |
8367 | static ssize_t |
8368 | rb_simple_read(struct file *filp, char __user *ubuf, | |
8369 | size_t cnt, loff_t *ppos) | |
8370 | { | |
348f0fc2 | 8371 | struct trace_array *tr = filp->private_data; |
499e5470 SR |
8372 | char buf[64]; |
8373 | int r; | |
8374 | ||
10246fa3 | 8375 | r = tracer_tracing_is_on(tr); |
499e5470 SR |
8376 | r = sprintf(buf, "%d\n", r); |
8377 | ||
8378 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
8379 | } | |
8380 | ||
8381 | static ssize_t | |
8382 | rb_simple_write(struct file *filp, const char __user *ubuf, | |
8383 | size_t cnt, loff_t *ppos) | |
8384 | { | |
348f0fc2 | 8385 | struct trace_array *tr = filp->private_data; |
13292494 | 8386 | struct trace_buffer *buffer = tr->array_buffer.buffer; |
499e5470 SR |
8387 | unsigned long val; |
8388 | int ret; | |
8389 | ||
8390 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); | |
8391 | if (ret) | |
8392 | return ret; | |
8393 | ||
8394 | if (buffer) { | |
2df8f8a6 | 8395 | mutex_lock(&trace_types_lock); |
f143641b SRV |
8396 | if (!!val == tracer_tracing_is_on(tr)) { |
8397 | val = 0; /* do nothing */ | |
8398 | } else if (val) { | |
10246fa3 | 8399 | tracer_tracing_on(tr); |
2b6080f2 SR |
8400 | if (tr->current_trace->start) |
8401 | tr->current_trace->start(tr); | |
2df8f8a6 | 8402 | } else { |
10246fa3 | 8403 | tracer_tracing_off(tr); |
2b6080f2 SR |
8404 | if (tr->current_trace->stop) |
8405 | tr->current_trace->stop(tr); | |
2df8f8a6 SR |
8406 | } |
8407 | mutex_unlock(&trace_types_lock); | |
499e5470 SR |
8408 | } |
8409 | ||
8410 | (*ppos)++; | |
8411 | ||
8412 | return cnt; | |
8413 | } | |
8414 | ||
8415 | static const struct file_operations rb_simple_fops = { | |
7b85af63 | 8416 | .open = tracing_open_generic_tr, |
499e5470 SR |
8417 | .read = rb_simple_read, |
8418 | .write = rb_simple_write, | |
7b85af63 | 8419 | .release = tracing_release_generic_tr, |
499e5470 SR |
8420 | .llseek = default_llseek, |
8421 | }; | |
8422 | ||
03329f99 SRV |
8423 | static ssize_t |
8424 | buffer_percent_read(struct file *filp, char __user *ubuf, | |
8425 | size_t cnt, loff_t *ppos) | |
8426 | { | |
8427 | struct trace_array *tr = filp->private_data; | |
8428 | char buf[64]; | |
8429 | int r; | |
8430 | ||
8431 | r = tr->buffer_percent; | |
8432 | r = sprintf(buf, "%d\n", r); | |
8433 | ||
8434 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
8435 | } | |
8436 | ||
8437 | static ssize_t | |
8438 | buffer_percent_write(struct file *filp, const char __user *ubuf, | |
8439 | size_t cnt, loff_t *ppos) | |
8440 | { | |
8441 | struct trace_array *tr = filp->private_data; | |
8442 | unsigned long val; | |
8443 | int ret; | |
8444 | ||
8445 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); | |
8446 | if (ret) | |
8447 | return ret; | |
8448 | ||
8449 | if (val > 100) | |
8450 | return -EINVAL; | |
8451 | ||
8452 | if (!val) | |
8453 | val = 1; | |
8454 | ||
8455 | tr->buffer_percent = val; | |
8456 | ||
8457 | (*ppos)++; | |
8458 | ||
8459 | return cnt; | |
8460 | } | |
8461 | ||
8462 | static const struct file_operations buffer_percent_fops = { | |
8463 | .open = tracing_open_generic_tr, | |
8464 | .read = buffer_percent_read, | |
8465 | .write = buffer_percent_write, | |
8466 | .release = tracing_release_generic_tr, | |
8467 | .llseek = default_llseek, | |
8468 | }; | |
8469 | ||
ff585c5b | 8470 | static struct dentry *trace_instance_dir; |
277ba044 SR |
8471 | |
8472 | static void | |
8434dc93 | 8473 | init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer); |
277ba044 | 8474 | |
55034cd6 | 8475 | static int |
1c5eb448 | 8476 | allocate_trace_buffer(struct trace_array *tr, struct array_buffer *buf, int size) |
277ba044 SR |
8477 | { |
8478 | enum ring_buffer_flags rb_flags; | |
737223fb | 8479 | |
983f938a | 8480 | rb_flags = tr->trace_flags & TRACE_ITER_OVERWRITE ? RB_FL_OVERWRITE : 0; |
737223fb | 8481 | |
dced341b SRRH |
8482 | buf->tr = tr; |
8483 | ||
55034cd6 SRRH |
8484 | buf->buffer = ring_buffer_alloc(size, rb_flags); |
8485 | if (!buf->buffer) | |
8486 | return -ENOMEM; | |
737223fb | 8487 | |
55034cd6 SRRH |
8488 | buf->data = alloc_percpu(struct trace_array_cpu); |
8489 | if (!buf->data) { | |
8490 | ring_buffer_free(buf->buffer); | |
4397f045 | 8491 | buf->buffer = NULL; |
55034cd6 SRRH |
8492 | return -ENOMEM; |
8493 | } | |
737223fb | 8494 | |
737223fb | 8495 | /* Allocate the first page for all buffers */ |
1c5eb448 SRV |
8496 | set_buffer_entries(&tr->array_buffer, |
8497 | ring_buffer_size(tr->array_buffer.buffer, 0)); | |
737223fb | 8498 | |
55034cd6 SRRH |
8499 | return 0; |
8500 | } | |
737223fb | 8501 | |
55034cd6 SRRH |
8502 | static int allocate_trace_buffers(struct trace_array *tr, int size) |
8503 | { | |
8504 | int ret; | |
737223fb | 8505 | |
1c5eb448 | 8506 | ret = allocate_trace_buffer(tr, &tr->array_buffer, size); |
55034cd6 SRRH |
8507 | if (ret) |
8508 | return ret; | |
737223fb | 8509 | |
55034cd6 SRRH |
8510 | #ifdef CONFIG_TRACER_MAX_TRACE |
8511 | ret = allocate_trace_buffer(tr, &tr->max_buffer, | |
8512 | allocate_snapshot ? size : 1); | |
24589e3a | 8513 | if (MEM_FAIL(ret, "Failed to allocate trace buffer\n")) { |
1c5eb448 SRV |
8514 | ring_buffer_free(tr->array_buffer.buffer); |
8515 | tr->array_buffer.buffer = NULL; | |
8516 | free_percpu(tr->array_buffer.data); | |
8517 | tr->array_buffer.data = NULL; | |
55034cd6 SRRH |
8518 | return -ENOMEM; |
8519 | } | |
8520 | tr->allocated_snapshot = allocate_snapshot; | |
737223fb | 8521 | |
55034cd6 SRRH |
8522 | /* |
8523 | * Only the top level trace array gets its snapshot allocated | |
8524 | * from the kernel command line. | |
8525 | */ | |
8526 | allocate_snapshot = false; | |
737223fb | 8527 | #endif |
55034cd6 | 8528 | return 0; |
737223fb SRRH |
8529 | } |
8530 | ||
1c5eb448 | 8531 | static void free_trace_buffer(struct array_buffer *buf) |
f0b70cc4 SRRH |
8532 | { |
8533 | if (buf->buffer) { | |
8534 | ring_buffer_free(buf->buffer); | |
8535 | buf->buffer = NULL; | |
8536 | free_percpu(buf->data); | |
8537 | buf->data = NULL; | |
8538 | } | |
8539 | } | |
8540 | ||
23aaa3c1 SRRH |
8541 | static void free_trace_buffers(struct trace_array *tr) |
8542 | { | |
8543 | if (!tr) | |
8544 | return; | |
8545 | ||
1c5eb448 | 8546 | free_trace_buffer(&tr->array_buffer); |
23aaa3c1 SRRH |
8547 | |
8548 | #ifdef CONFIG_TRACER_MAX_TRACE | |
f0b70cc4 | 8549 | free_trace_buffer(&tr->max_buffer); |
23aaa3c1 SRRH |
8550 | #endif |
8551 | } | |
8552 | ||
9a38a885 SRRH |
8553 | static void init_trace_flags_index(struct trace_array *tr) |
8554 | { | |
8555 | int i; | |
8556 | ||
8557 | /* Used by the trace options files */ | |
8558 | for (i = 0; i < TRACE_FLAGS_MAX_SIZE; i++) | |
8559 | tr->trace_flags_index[i] = i; | |
8560 | } | |
8561 | ||
37aea98b SRRH |
8562 | static void __update_tracer_options(struct trace_array *tr) |
8563 | { | |
8564 | struct tracer *t; | |
8565 | ||
8566 | for (t = trace_types; t; t = t->next) | |
8567 | add_tracer_options(tr, t); | |
8568 | } | |
8569 | ||
8570 | static void update_tracer_options(struct trace_array *tr) | |
8571 | { | |
8572 | mutex_lock(&trace_types_lock); | |
8573 | __update_tracer_options(tr); | |
8574 | mutex_unlock(&trace_types_lock); | |
8575 | } | |
8576 | ||
89c95fce TZ |
8577 | /* Must have trace_types_lock held */ |
8578 | struct trace_array *trace_array_find(const char *instance) | |
8579 | { | |
8580 | struct trace_array *tr, *found = NULL; | |
8581 | ||
8582 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
8583 | if (tr->name && strcmp(tr->name, instance) == 0) { | |
8584 | found = tr; | |
8585 | break; | |
8586 | } | |
8587 | } | |
8588 | ||
8589 | return found; | |
8590 | } | |
8591 | ||
8592 | struct trace_array *trace_array_find_get(const char *instance) | |
8593 | { | |
8594 | struct trace_array *tr; | |
8595 | ||
8596 | mutex_lock(&trace_types_lock); | |
8597 | tr = trace_array_find(instance); | |
8598 | if (tr) | |
8599 | tr->ref++; | |
8600 | mutex_unlock(&trace_types_lock); | |
8601 | ||
8602 | return tr; | |
8603 | } | |
8604 | ||
28879787 | 8605 | static struct trace_array *trace_array_create(const char *name) |
737223fb | 8606 | { |
277ba044 SR |
8607 | struct trace_array *tr; |
8608 | int ret; | |
277ba044 | 8609 | |
277ba044 SR |
8610 | ret = -ENOMEM; |
8611 | tr = kzalloc(sizeof(*tr), GFP_KERNEL); | |
8612 | if (!tr) | |
28879787 | 8613 | return ERR_PTR(ret); |
277ba044 SR |
8614 | |
8615 | tr->name = kstrdup(name, GFP_KERNEL); | |
8616 | if (!tr->name) | |
8617 | goto out_free_tr; | |
8618 | ||
ccfe9e42 AL |
8619 | if (!alloc_cpumask_var(&tr->tracing_cpumask, GFP_KERNEL)) |
8620 | goto out_free_tr; | |
8621 | ||
20550622 | 8622 | tr->trace_flags = global_trace.trace_flags & ~ZEROED_TRACE_FLAGS; |
983f938a | 8623 | |
ccfe9e42 AL |
8624 | cpumask_copy(tr->tracing_cpumask, cpu_all_mask); |
8625 | ||
277ba044 SR |
8626 | raw_spin_lock_init(&tr->start_lock); |
8627 | ||
0b9b12c1 SRRH |
8628 | tr->max_lock = (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED; |
8629 | ||
277ba044 SR |
8630 | tr->current_trace = &nop_trace; |
8631 | ||
8632 | INIT_LIST_HEAD(&tr->systems); | |
8633 | INIT_LIST_HEAD(&tr->events); | |
067fe038 | 8634 | INIT_LIST_HEAD(&tr->hist_vars); |
2f754e77 | 8635 | INIT_LIST_HEAD(&tr->err_log); |
277ba044 | 8636 | |
737223fb | 8637 | if (allocate_trace_buffers(tr, trace_buf_size) < 0) |
277ba044 SR |
8638 | goto out_free_tr; |
8639 | ||
8434dc93 | 8640 | tr->dir = tracefs_create_dir(name, trace_instance_dir); |
277ba044 SR |
8641 | if (!tr->dir) |
8642 | goto out_free_tr; | |
8643 | ||
8644 | ret = event_trace_add_tracer(tr->dir, tr); | |
609e85a7 | 8645 | if (ret) { |
a3d1e7eb | 8646 | tracefs_remove(tr->dir); |
277ba044 | 8647 | goto out_free_tr; |
609e85a7 | 8648 | } |
277ba044 | 8649 | |
04ec7bb6 SRV |
8650 | ftrace_init_trace_array(tr); |
8651 | ||
8434dc93 | 8652 | init_tracer_tracefs(tr, tr->dir); |
9a38a885 | 8653 | init_trace_flags_index(tr); |
37aea98b | 8654 | __update_tracer_options(tr); |
277ba044 SR |
8655 | |
8656 | list_add(&tr->list, &ftrace_trace_arrays); | |
8657 | ||
28879787 DI |
8658 | tr->ref++; |
8659 | ||
277ba044 | 8660 | |
f45d1225 | 8661 | return tr; |
277ba044 SR |
8662 | |
8663 | out_free_tr: | |
23aaa3c1 | 8664 | free_trace_buffers(tr); |
ccfe9e42 | 8665 | free_cpumask_var(tr->tracing_cpumask); |
277ba044 SR |
8666 | kfree(tr->name); |
8667 | kfree(tr); | |
8668 | ||
f45d1225 DI |
8669 | return ERR_PTR(ret); |
8670 | } | |
277ba044 | 8671 | |
f45d1225 DI |
8672 | static int instance_mkdir(const char *name) |
8673 | { | |
28879787 DI |
8674 | struct trace_array *tr; |
8675 | int ret; | |
8676 | ||
8677 | mutex_lock(&event_mutex); | |
8678 | mutex_lock(&trace_types_lock); | |
8679 | ||
8680 | ret = -EEXIST; | |
89c95fce TZ |
8681 | if (trace_array_find(name)) |
8682 | goto out_unlock; | |
28879787 DI |
8683 | |
8684 | tr = trace_array_create(name); | |
8685 | ||
8686 | ret = PTR_ERR_OR_ZERO(tr); | |
8687 | ||
8688 | out_unlock: | |
8689 | mutex_unlock(&trace_types_lock); | |
8690 | mutex_unlock(&event_mutex); | |
8691 | return ret; | |
8692 | } | |
8693 | ||
8694 | /** | |
8695 | * trace_array_get_by_name - Create/Lookup a trace array, given its name. | |
8696 | * @name: The name of the trace array to be looked up/created. | |
8697 | * | |
8698 | * Returns pointer to trace array with given name. | |
8699 | * NULL, if it cannot be created. | |
8700 | * | |
8701 | * NOTE: This function increments the reference counter associated with the | |
8702 | * trace array returned. This makes sure it cannot be freed while in use. | |
8703 | * Use trace_array_put() once the trace array is no longer needed. | |
28394da2 SRV |
8704 | * If the trace_array is to be freed, trace_array_destroy() needs to |
8705 | * be called after the trace_array_put(), or simply let user space delete | |
8706 | * it from the tracefs instances directory. But until the | |
8707 | * trace_array_put() is called, user space can not delete it. | |
28879787 DI |
8708 | * |
8709 | */ | |
8710 | struct trace_array *trace_array_get_by_name(const char *name) | |
8711 | { | |
8712 | struct trace_array *tr; | |
8713 | ||
8714 | mutex_lock(&event_mutex); | |
8715 | mutex_lock(&trace_types_lock); | |
8716 | ||
8717 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
8718 | if (tr->name && strcmp(tr->name, name) == 0) | |
8719 | goto out_unlock; | |
8720 | } | |
8721 | ||
8722 | tr = trace_array_create(name); | |
8723 | ||
8724 | if (IS_ERR(tr)) | |
8725 | tr = NULL; | |
8726 | out_unlock: | |
8727 | if (tr) | |
8728 | tr->ref++; | |
8729 | ||
8730 | mutex_unlock(&trace_types_lock); | |
8731 | mutex_unlock(&event_mutex); | |
8732 | return tr; | |
277ba044 | 8733 | } |
28879787 | 8734 | EXPORT_SYMBOL_GPL(trace_array_get_by_name); |
277ba044 | 8735 | |
f45d1225 | 8736 | static int __remove_instance(struct trace_array *tr) |
0c8916c3 | 8737 | { |
37aea98b | 8738 | int i; |
0c8916c3 | 8739 | |
28879787 DI |
8740 | /* Reference counter for a newly created trace array = 1. */ |
8741 | if (tr->ref > 1 || (tr->current_trace && tr->current_trace->ref)) | |
f45d1225 | 8742 | return -EBUSY; |
a695cb58 | 8743 | |
0c8916c3 SR |
8744 | list_del(&tr->list); |
8745 | ||
20550622 SRRH |
8746 | /* Disable all the flags that were enabled coming in */ |
8747 | for (i = 0; i < TRACE_FLAGS_MAX_SIZE; i++) { | |
8748 | if ((1 << i) & ZEROED_TRACE_FLAGS) | |
8749 | set_tracer_flag(tr, 1 << i, 0); | |
8750 | } | |
8751 | ||
6b450d25 | 8752 | tracing_set_nop(tr); |
a0e6369e | 8753 | clear_ftrace_function_probes(tr); |
0c8916c3 | 8754 | event_trace_del_tracer(tr); |
d879d0b8 | 8755 | ftrace_clear_pids(tr); |
591dffda | 8756 | ftrace_destroy_function_files(tr); |
a3d1e7eb | 8757 | tracefs_remove(tr->dir); |
a9fcaaac | 8758 | free_trace_buffers(tr); |
0c8916c3 | 8759 | |
37aea98b SRRH |
8760 | for (i = 0; i < tr->nr_topts; i++) { |
8761 | kfree(tr->topts[i].topts); | |
8762 | } | |
8763 | kfree(tr->topts); | |
8764 | ||
db9108e0 | 8765 | free_cpumask_var(tr->tracing_cpumask); |
0c8916c3 SR |
8766 | kfree(tr->name); |
8767 | kfree(tr); | |
f45d1225 | 8768 | tr = NULL; |
0c8916c3 | 8769 | |
f45d1225 DI |
8770 | return 0; |
8771 | } | |
8772 | ||
e585e646 | 8773 | int trace_array_destroy(struct trace_array *this_tr) |
f45d1225 | 8774 | { |
e585e646 | 8775 | struct trace_array *tr; |
f45d1225 DI |
8776 | int ret; |
8777 | ||
e585e646 | 8778 | if (!this_tr) |
f45d1225 DI |
8779 | return -EINVAL; |
8780 | ||
8781 | mutex_lock(&event_mutex); | |
8782 | mutex_lock(&trace_types_lock); | |
8783 | ||
e585e646 DI |
8784 | ret = -ENODEV; |
8785 | ||
8786 | /* Making sure trace array exists before destroying it. */ | |
8787 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
8788 | if (tr == this_tr) { | |
8789 | ret = __remove_instance(tr); | |
8790 | break; | |
8791 | } | |
8792 | } | |
f45d1225 DI |
8793 | |
8794 | mutex_unlock(&trace_types_lock); | |
8795 | mutex_unlock(&event_mutex); | |
8796 | ||
8797 | return ret; | |
8798 | } | |
8799 | EXPORT_SYMBOL_GPL(trace_array_destroy); | |
8800 | ||
8801 | static int instance_rmdir(const char *name) | |
8802 | { | |
8803 | struct trace_array *tr; | |
8804 | int ret; | |
8805 | ||
8806 | mutex_lock(&event_mutex); | |
8807 | mutex_lock(&trace_types_lock); | |
8808 | ||
8809 | ret = -ENODEV; | |
89c95fce TZ |
8810 | tr = trace_array_find(name); |
8811 | if (tr) | |
8812 | ret = __remove_instance(tr); | |
0c8916c3 | 8813 | |
0c8916c3 | 8814 | mutex_unlock(&trace_types_lock); |
12ecef0c | 8815 | mutex_unlock(&event_mutex); |
0c8916c3 SR |
8816 | |
8817 | return ret; | |
8818 | } | |
8819 | ||
277ba044 SR |
8820 | static __init void create_trace_instances(struct dentry *d_tracer) |
8821 | { | |
eae47358 SRRH |
8822 | trace_instance_dir = tracefs_create_instance_dir("instances", d_tracer, |
8823 | instance_mkdir, | |
8824 | instance_rmdir); | |
24589e3a | 8825 | if (MEM_FAIL(!trace_instance_dir, "Failed to create instances directory\n")) |
277ba044 | 8826 | return; |
277ba044 SR |
8827 | } |
8828 | ||
2b6080f2 | 8829 | static void |
8434dc93 | 8830 | init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer) |
2b6080f2 | 8831 | { |
3dd80953 | 8832 | struct trace_event_file *file; |
121aaee7 | 8833 | int cpu; |
2b6080f2 | 8834 | |
607e2ea1 SRRH |
8835 | trace_create_file("available_tracers", 0444, d_tracer, |
8836 | tr, &show_traces_fops); | |
8837 | ||
8838 | trace_create_file("current_tracer", 0644, d_tracer, | |
8839 | tr, &set_tracer_fops); | |
8840 | ||
ccfe9e42 AL |
8841 | trace_create_file("tracing_cpumask", 0644, d_tracer, |
8842 | tr, &tracing_cpumask_fops); | |
8843 | ||
2b6080f2 SR |
8844 | trace_create_file("trace_options", 0644, d_tracer, |
8845 | tr, &tracing_iter_fops); | |
8846 | ||
8847 | trace_create_file("trace", 0644, d_tracer, | |
6484c71c | 8848 | tr, &tracing_fops); |
2b6080f2 SR |
8849 | |
8850 | trace_create_file("trace_pipe", 0444, d_tracer, | |
15544209 | 8851 | tr, &tracing_pipe_fops); |
2b6080f2 SR |
8852 | |
8853 | trace_create_file("buffer_size_kb", 0644, d_tracer, | |
0bc392ee | 8854 | tr, &tracing_entries_fops); |
2b6080f2 SR |
8855 | |
8856 | trace_create_file("buffer_total_size_kb", 0444, d_tracer, | |
8857 | tr, &tracing_total_entries_fops); | |
8858 | ||
238ae93d | 8859 | trace_create_file("free_buffer", 0200, d_tracer, |
2b6080f2 SR |
8860 | tr, &tracing_free_buffer_fops); |
8861 | ||
8862 | trace_create_file("trace_marker", 0220, d_tracer, | |
8863 | tr, &tracing_mark_fops); | |
8864 | ||
3dd80953 SRV |
8865 | file = __find_event_file(tr, "ftrace", "print"); |
8866 | if (file && file->dir) | |
8867 | trace_create_file("trigger", 0644, file->dir, file, | |
8868 | &event_trigger_fops); | |
8869 | tr->trace_marker_file = file; | |
8870 | ||
fa32e855 SR |
8871 | trace_create_file("trace_marker_raw", 0220, d_tracer, |
8872 | tr, &tracing_mark_raw_fops); | |
8873 | ||
2b6080f2 SR |
8874 | trace_create_file("trace_clock", 0644, d_tracer, tr, |
8875 | &trace_clock_fops); | |
8876 | ||
8877 | trace_create_file("tracing_on", 0644, d_tracer, | |
6484c71c | 8878 | tr, &rb_simple_fops); |
ce9bae55 | 8879 | |
2c1ea60b TZ |
8880 | trace_create_file("timestamp_mode", 0444, d_tracer, tr, |
8881 | &trace_time_stamp_mode_fops); | |
8882 | ||
a7b1d74e | 8883 | tr->buffer_percent = 50; |
03329f99 SRV |
8884 | |
8885 | trace_create_file("buffer_percent", 0444, d_tracer, | |
8886 | tr, &buffer_percent_fops); | |
8887 | ||
16270145 SRRH |
8888 | create_trace_options_dir(tr); |
8889 | ||
f971cc9a | 8890 | #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) |
91edde2e | 8891 | trace_create_maxlat_file(tr, d_tracer); |
6d9b3fa5 SRRH |
8892 | #endif |
8893 | ||
591dffda | 8894 | if (ftrace_create_function_files(tr, d_tracer)) |
24589e3a | 8895 | MEM_FAIL(1, "Could not allocate function filter files"); |
591dffda | 8896 | |
ce9bae55 SRRH |
8897 | #ifdef CONFIG_TRACER_SNAPSHOT |
8898 | trace_create_file("snapshot", 0644, d_tracer, | |
6484c71c | 8899 | tr, &snapshot_fops); |
ce9bae55 | 8900 | #endif |
121aaee7 | 8901 | |
8a062902 TZ |
8902 | trace_create_file("error_log", 0644, d_tracer, |
8903 | tr, &tracing_err_log_fops); | |
8904 | ||
121aaee7 | 8905 | for_each_tracing_cpu(cpu) |
8434dc93 | 8906 | tracing_init_tracefs_percpu(tr, cpu); |
121aaee7 | 8907 | |
345ddcc8 | 8908 | ftrace_init_tracefs(tr, d_tracer); |
2b6080f2 SR |
8909 | } |
8910 | ||
93faccbb | 8911 | static struct vfsmount *trace_automount(struct dentry *mntpt, void *ingore) |
f76180bc SRRH |
8912 | { |
8913 | struct vfsmount *mnt; | |
8914 | struct file_system_type *type; | |
8915 | ||
8916 | /* | |
8917 | * To maintain backward compatibility for tools that mount | |
8918 | * debugfs to get to the tracing facility, tracefs is automatically | |
8919 | * mounted to the debugfs/tracing directory. | |
8920 | */ | |
8921 | type = get_fs_type("tracefs"); | |
8922 | if (!type) | |
8923 | return NULL; | |
93faccbb | 8924 | mnt = vfs_submount(mntpt, type, "tracefs", NULL); |
f76180bc SRRH |
8925 | put_filesystem(type); |
8926 | if (IS_ERR(mnt)) | |
8927 | return NULL; | |
8928 | mntget(mnt); | |
8929 | ||
8930 | return mnt; | |
8931 | } | |
8932 | ||
7eeafbca SRRH |
8933 | /** |
8934 | * tracing_init_dentry - initialize top level trace array | |
8935 | * | |
8936 | * This is called when creating files or directories in the tracing | |
8937 | * directory. It is called via fs_initcall() by any of the boot up code | |
8938 | * and expects to return the dentry of the top level tracing directory. | |
8939 | */ | |
8940 | struct dentry *tracing_init_dentry(void) | |
8941 | { | |
8942 | struct trace_array *tr = &global_trace; | |
8943 | ||
a356646a | 8944 | if (security_locked_down(LOCKDOWN_TRACEFS)) { |
ee195452 | 8945 | pr_warn("Tracing disabled due to lockdown\n"); |
a356646a SRV |
8946 | return ERR_PTR(-EPERM); |
8947 | } | |
8948 | ||
f76180bc | 8949 | /* The top level trace array uses NULL as parent */ |
7eeafbca | 8950 | if (tr->dir) |
f76180bc | 8951 | return NULL; |
7eeafbca | 8952 | |
8b129199 JW |
8953 | if (WARN_ON(!tracefs_initialized()) || |
8954 | (IS_ENABLED(CONFIG_DEBUG_FS) && | |
8955 | WARN_ON(!debugfs_initialized()))) | |
7eeafbca SRRH |
8956 | return ERR_PTR(-ENODEV); |
8957 | ||
f76180bc SRRH |
8958 | /* |
8959 | * As there may still be users that expect the tracing | |
8960 | * files to exist in debugfs/tracing, we must automount | |
8961 | * the tracefs file system there, so older tools still | |
8962 | * work with the newer kerenl. | |
8963 | */ | |
8964 | tr->dir = debugfs_create_automount("tracing", NULL, | |
8965 | trace_automount, NULL); | |
7eeafbca | 8966 | |
8434dc93 | 8967 | return NULL; |
7eeafbca SRRH |
8968 | } |
8969 | ||
00f4b652 JL |
8970 | extern struct trace_eval_map *__start_ftrace_eval_maps[]; |
8971 | extern struct trace_eval_map *__stop_ftrace_eval_maps[]; | |
0c564a53 | 8972 | |
5f60b351 | 8973 | static void __init trace_eval_init(void) |
0c564a53 | 8974 | { |
3673b8e4 SRRH |
8975 | int len; |
8976 | ||
02fd7f68 | 8977 | len = __stop_ftrace_eval_maps - __start_ftrace_eval_maps; |
f57a4143 | 8978 | trace_insert_eval_map(NULL, __start_ftrace_eval_maps, len); |
3673b8e4 SRRH |
8979 | } |
8980 | ||
8981 | #ifdef CONFIG_MODULES | |
f57a4143 | 8982 | static void trace_module_add_evals(struct module *mod) |
3673b8e4 | 8983 | { |
99be647c | 8984 | if (!mod->num_trace_evals) |
3673b8e4 SRRH |
8985 | return; |
8986 | ||
8987 | /* | |
8988 | * Modules with bad taint do not have events created, do | |
8989 | * not bother with enums either. | |
8990 | */ | |
8991 | if (trace_module_has_bad_taint(mod)) | |
8992 | return; | |
8993 | ||
f57a4143 | 8994 | trace_insert_eval_map(mod, mod->trace_evals, mod->num_trace_evals); |
3673b8e4 SRRH |
8995 | } |
8996 | ||
681bec03 | 8997 | #ifdef CONFIG_TRACE_EVAL_MAP_FILE |
f57a4143 | 8998 | static void trace_module_remove_evals(struct module *mod) |
9828413d | 8999 | { |
23bf8cb8 JL |
9000 | union trace_eval_map_item *map; |
9001 | union trace_eval_map_item **last = &trace_eval_maps; | |
9828413d | 9002 | |
99be647c | 9003 | if (!mod->num_trace_evals) |
9828413d SRRH |
9004 | return; |
9005 | ||
1793ed93 | 9006 | mutex_lock(&trace_eval_mutex); |
9828413d | 9007 | |
23bf8cb8 | 9008 | map = trace_eval_maps; |
9828413d SRRH |
9009 | |
9010 | while (map) { | |
9011 | if (map->head.mod == mod) | |
9012 | break; | |
5f60b351 | 9013 | map = trace_eval_jmp_to_tail(map); |
9828413d SRRH |
9014 | last = &map->tail.next; |
9015 | map = map->tail.next; | |
9016 | } | |
9017 | if (!map) | |
9018 | goto out; | |
9019 | ||
5f60b351 | 9020 | *last = trace_eval_jmp_to_tail(map)->tail.next; |
9828413d SRRH |
9021 | kfree(map); |
9022 | out: | |
1793ed93 | 9023 | mutex_unlock(&trace_eval_mutex); |
9828413d SRRH |
9024 | } |
9025 | #else | |
f57a4143 | 9026 | static inline void trace_module_remove_evals(struct module *mod) { } |
681bec03 | 9027 | #endif /* CONFIG_TRACE_EVAL_MAP_FILE */ |
9828413d | 9028 | |
3673b8e4 SRRH |
9029 | static int trace_module_notify(struct notifier_block *self, |
9030 | unsigned long val, void *data) | |
9031 | { | |
9032 | struct module *mod = data; | |
9033 | ||
9034 | switch (val) { | |
9035 | case MODULE_STATE_COMING: | |
f57a4143 | 9036 | trace_module_add_evals(mod); |
3673b8e4 | 9037 | break; |
9828413d | 9038 | case MODULE_STATE_GOING: |
f57a4143 | 9039 | trace_module_remove_evals(mod); |
9828413d | 9040 | break; |
3673b8e4 SRRH |
9041 | } |
9042 | ||
9043 | return 0; | |
0c564a53 SRRH |
9044 | } |
9045 | ||
3673b8e4 SRRH |
9046 | static struct notifier_block trace_module_nb = { |
9047 | .notifier_call = trace_module_notify, | |
9048 | .priority = 0, | |
9049 | }; | |
9828413d | 9050 | #endif /* CONFIG_MODULES */ |
3673b8e4 | 9051 | |
8434dc93 | 9052 | static __init int tracer_init_tracefs(void) |
bc0c38d1 SR |
9053 | { |
9054 | struct dentry *d_tracer; | |
bc0c38d1 | 9055 | |
7e53bd42 LJ |
9056 | trace_access_lock_init(); |
9057 | ||
bc0c38d1 | 9058 | d_tracer = tracing_init_dentry(); |
14a5ae40 | 9059 | if (IS_ERR(d_tracer)) |
ed6f1c99 | 9060 | return 0; |
bc0c38d1 | 9061 | |
58b92547 SRV |
9062 | event_trace_init(); |
9063 | ||
8434dc93 | 9064 | init_tracer_tracefs(&global_trace, d_tracer); |
501c2375 | 9065 | ftrace_init_tracefs_toplevel(&global_trace, d_tracer); |
bc0c38d1 | 9066 | |
5452af66 | 9067 | trace_create_file("tracing_thresh", 0644, d_tracer, |
6508fa76 | 9068 | &global_trace, &tracing_thresh_fops); |
a8259075 | 9069 | |
339ae5d3 | 9070 | trace_create_file("README", 0444, d_tracer, |
5452af66 FW |
9071 | NULL, &tracing_readme_fops); |
9072 | ||
69abe6a5 AP |
9073 | trace_create_file("saved_cmdlines", 0444, d_tracer, |
9074 | NULL, &tracing_saved_cmdlines_fops); | |
5bf9a1ee | 9075 | |
939c7a4f YY |
9076 | trace_create_file("saved_cmdlines_size", 0644, d_tracer, |
9077 | NULL, &tracing_saved_cmdlines_size_fops); | |
9078 | ||
99c621d7 MS |
9079 | trace_create_file("saved_tgids", 0444, d_tracer, |
9080 | NULL, &tracing_saved_tgids_fops); | |
9081 | ||
5f60b351 | 9082 | trace_eval_init(); |
0c564a53 | 9083 | |
f57a4143 | 9084 | trace_create_eval_file(d_tracer); |
9828413d | 9085 | |
3673b8e4 SRRH |
9086 | #ifdef CONFIG_MODULES |
9087 | register_module_notifier(&trace_module_nb); | |
9088 | #endif | |
9089 | ||
bc0c38d1 | 9090 | #ifdef CONFIG_DYNAMIC_FTRACE |
5452af66 | 9091 | trace_create_file("dyn_ftrace_total_info", 0444, d_tracer, |
da537f0a | 9092 | NULL, &tracing_dyn_info_fops); |
bc0c38d1 | 9093 | #endif |
b04cc6b1 | 9094 | |
277ba044 | 9095 | create_trace_instances(d_tracer); |
5452af66 | 9096 | |
37aea98b | 9097 | update_tracer_options(&global_trace); |
09d23a1d | 9098 | |
b5ad384e | 9099 | return 0; |
bc0c38d1 SR |
9100 | } |
9101 | ||
3f5a54e3 SR |
9102 | static int trace_panic_handler(struct notifier_block *this, |
9103 | unsigned long event, void *unused) | |
9104 | { | |
944ac425 | 9105 | if (ftrace_dump_on_oops) |
cecbca96 | 9106 | ftrace_dump(ftrace_dump_on_oops); |
3f5a54e3 SR |
9107 | return NOTIFY_OK; |
9108 | } | |
9109 | ||
9110 | static struct notifier_block trace_panic_notifier = { | |
9111 | .notifier_call = trace_panic_handler, | |
9112 | .next = NULL, | |
9113 | .priority = 150 /* priority: INT_MAX >= x >= 0 */ | |
9114 | }; | |
9115 | ||
9116 | static int trace_die_handler(struct notifier_block *self, | |
9117 | unsigned long val, | |
9118 | void *data) | |
9119 | { | |
9120 | switch (val) { | |
9121 | case DIE_OOPS: | |
944ac425 | 9122 | if (ftrace_dump_on_oops) |
cecbca96 | 9123 | ftrace_dump(ftrace_dump_on_oops); |
3f5a54e3 SR |
9124 | break; |
9125 | default: | |
9126 | break; | |
9127 | } | |
9128 | return NOTIFY_OK; | |
9129 | } | |
9130 | ||
9131 | static struct notifier_block trace_die_notifier = { | |
9132 | .notifier_call = trace_die_handler, | |
9133 | .priority = 200 | |
9134 | }; | |
9135 | ||
9136 | /* | |
9137 | * printk is set to max of 1024, we really don't need it that big. | |
9138 | * Nothing should be printing 1000 characters anyway. | |
9139 | */ | |
9140 | #define TRACE_MAX_PRINT 1000 | |
9141 | ||
9142 | /* | |
9143 | * Define here KERN_TRACE so that we have one place to modify | |
9144 | * it if we decide to change what log level the ftrace dump | |
9145 | * should be at. | |
9146 | */ | |
428aee14 | 9147 | #define KERN_TRACE KERN_EMERG |
3f5a54e3 | 9148 | |
955b61e5 | 9149 | void |
3f5a54e3 SR |
9150 | trace_printk_seq(struct trace_seq *s) |
9151 | { | |
9152 | /* Probably should print a warning here. */ | |
3a161d99 SRRH |
9153 | if (s->seq.len >= TRACE_MAX_PRINT) |
9154 | s->seq.len = TRACE_MAX_PRINT; | |
3f5a54e3 | 9155 | |
820b75f6 SRRH |
9156 | /* |
9157 | * More paranoid code. Although the buffer size is set to | |
9158 | * PAGE_SIZE, and TRACE_MAX_PRINT is 1000, this is just | |
9159 | * an extra layer of protection. | |
9160 | */ | |
9161 | if (WARN_ON_ONCE(s->seq.len >= s->seq.size)) | |
9162 | s->seq.len = s->seq.size - 1; | |
3f5a54e3 SR |
9163 | |
9164 | /* should be zero ended, but we are paranoid. */ | |
3a161d99 | 9165 | s->buffer[s->seq.len] = 0; |
3f5a54e3 SR |
9166 | |
9167 | printk(KERN_TRACE "%s", s->buffer); | |
9168 | ||
f9520750 | 9169 | trace_seq_init(s); |
3f5a54e3 SR |
9170 | } |
9171 | ||
955b61e5 JW |
9172 | void trace_init_global_iter(struct trace_iterator *iter) |
9173 | { | |
9174 | iter->tr = &global_trace; | |
2b6080f2 | 9175 | iter->trace = iter->tr->current_trace; |
ae3b5093 | 9176 | iter->cpu_file = RING_BUFFER_ALL_CPUS; |
1c5eb448 | 9177 | iter->array_buffer = &global_trace.array_buffer; |
b2f974d6 CS |
9178 | |
9179 | if (iter->trace && iter->trace->open) | |
9180 | iter->trace->open(iter); | |
9181 | ||
9182 | /* Annotate start of buffers if we had overruns */ | |
1c5eb448 | 9183 | if (ring_buffer_overruns(iter->array_buffer->buffer)) |
b2f974d6 CS |
9184 | iter->iter_flags |= TRACE_FILE_ANNOTATE; |
9185 | ||
9186 | /* Output in nanoseconds only if we are using a clock in nanoseconds. */ | |
9187 | if (trace_clocks[iter->tr->clock_id].in_ns) | |
9188 | iter->iter_flags |= TRACE_FILE_TIME_IN_NS; | |
955b61e5 JW |
9189 | } |
9190 | ||
7fe70b57 | 9191 | void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) |
3f5a54e3 | 9192 | { |
3f5a54e3 SR |
9193 | /* use static because iter can be a bit big for the stack */ |
9194 | static struct trace_iterator iter; | |
7fe70b57 | 9195 | static atomic_t dump_running; |
983f938a | 9196 | struct trace_array *tr = &global_trace; |
cf586b61 | 9197 | unsigned int old_userobj; |
d769041f SR |
9198 | unsigned long flags; |
9199 | int cnt = 0, cpu; | |
3f5a54e3 | 9200 | |
7fe70b57 SRRH |
9201 | /* Only allow one dump user at a time. */ |
9202 | if (atomic_inc_return(&dump_running) != 1) { | |
9203 | atomic_dec(&dump_running); | |
9204 | return; | |
9205 | } | |
3f5a54e3 | 9206 | |
7fe70b57 SRRH |
9207 | /* |
9208 | * Always turn off tracing when we dump. | |
9209 | * We don't need to show trace output of what happens | |
9210 | * between multiple crashes. | |
9211 | * | |
9212 | * If the user does a sysrq-z, then they can re-enable | |
9213 | * tracing with echo 1 > tracing_on. | |
9214 | */ | |
0ee6b6cf | 9215 | tracing_off(); |
cf586b61 | 9216 | |
7fe70b57 | 9217 | local_irq_save(flags); |
03fc7f9c | 9218 | printk_nmi_direct_enter(); |
3f5a54e3 | 9219 | |
38dbe0b1 | 9220 | /* Simulate the iterator */ |
955b61e5 | 9221 | trace_init_global_iter(&iter); |
8e99cf91 SRV |
9222 | /* Can not use kmalloc for iter.temp */ |
9223 | iter.temp = static_temp_buf; | |
9224 | iter.temp_size = STATIC_TEMP_BUF_SIZE; | |
955b61e5 | 9225 | |
d769041f | 9226 | for_each_tracing_cpu(cpu) { |
1c5eb448 | 9227 | atomic_inc(&per_cpu_ptr(iter.array_buffer->data, cpu)->disabled); |
d769041f SR |
9228 | } |
9229 | ||
983f938a | 9230 | old_userobj = tr->trace_flags & TRACE_ITER_SYM_USEROBJ; |
cf586b61 | 9231 | |
b54d3de9 | 9232 | /* don't look at user memory in panic mode */ |
983f938a | 9233 | tr->trace_flags &= ~TRACE_ITER_SYM_USEROBJ; |
b54d3de9 | 9234 | |
cecbca96 FW |
9235 | switch (oops_dump_mode) { |
9236 | case DUMP_ALL: | |
ae3b5093 | 9237 | iter.cpu_file = RING_BUFFER_ALL_CPUS; |
cecbca96 FW |
9238 | break; |
9239 | case DUMP_ORIG: | |
9240 | iter.cpu_file = raw_smp_processor_id(); | |
9241 | break; | |
9242 | case DUMP_NONE: | |
9243 | goto out_enable; | |
9244 | default: | |
9245 | printk(KERN_TRACE "Bad dumping mode, switching to all CPUs dump\n"); | |
ae3b5093 | 9246 | iter.cpu_file = RING_BUFFER_ALL_CPUS; |
cecbca96 FW |
9247 | } |
9248 | ||
9249 | printk(KERN_TRACE "Dumping ftrace buffer:\n"); | |
3f5a54e3 | 9250 | |
7fe70b57 SRRH |
9251 | /* Did function tracer already get disabled? */ |
9252 | if (ftrace_is_dead()) { | |
9253 | printk("# WARNING: FUNCTION TRACING IS CORRUPTED\n"); | |
9254 | printk("# MAY BE MISSING FUNCTION EVENTS\n"); | |
9255 | } | |
9256 | ||
3f5a54e3 SR |
9257 | /* |
9258 | * We need to stop all tracing on all CPUS to read the | |
9259 | * the next buffer. This is a bit expensive, but is | |
9260 | * not done often. We fill all what we can read, | |
9261 | * and then release the locks again. | |
9262 | */ | |
9263 | ||
3f5a54e3 SR |
9264 | while (!trace_empty(&iter)) { |
9265 | ||
9266 | if (!cnt) | |
9267 | printk(KERN_TRACE "---------------------------------\n"); | |
9268 | ||
9269 | cnt++; | |
9270 | ||
0c97bf86 | 9271 | trace_iterator_reset(&iter); |
3f5a54e3 | 9272 | iter.iter_flags |= TRACE_FILE_LAT_FMT; |
3f5a54e3 | 9273 | |
955b61e5 | 9274 | if (trace_find_next_entry_inc(&iter) != NULL) { |
74e7ff8c LJ |
9275 | int ret; |
9276 | ||
9277 | ret = print_trace_line(&iter); | |
9278 | if (ret != TRACE_TYPE_NO_CONSUME) | |
9279 | trace_consume(&iter); | |
3f5a54e3 | 9280 | } |
b892e5c8 | 9281 | touch_nmi_watchdog(); |
3f5a54e3 SR |
9282 | |
9283 | trace_printk_seq(&iter.seq); | |
9284 | } | |
9285 | ||
9286 | if (!cnt) | |
9287 | printk(KERN_TRACE " (ftrace buffer empty)\n"); | |
9288 | else | |
9289 | printk(KERN_TRACE "---------------------------------\n"); | |
9290 | ||
cecbca96 | 9291 | out_enable: |
983f938a | 9292 | tr->trace_flags |= old_userobj; |
cf586b61 | 9293 | |
7fe70b57 | 9294 | for_each_tracing_cpu(cpu) { |
1c5eb448 | 9295 | atomic_dec(&per_cpu_ptr(iter.array_buffer->data, cpu)->disabled); |
cf586b61 | 9296 | } |
03fc7f9c PM |
9297 | atomic_dec(&dump_running); |
9298 | printk_nmi_direct_exit(); | |
cd891ae0 | 9299 | local_irq_restore(flags); |
3f5a54e3 | 9300 | } |
a8eecf22 | 9301 | EXPORT_SYMBOL_GPL(ftrace_dump); |
cf586b61 | 9302 | |
7e465baa TZ |
9303 | int trace_run_command(const char *buf, int (*createfn)(int, char **)) |
9304 | { | |
9305 | char **argv; | |
9306 | int argc, ret; | |
9307 | ||
9308 | argc = 0; | |
9309 | ret = 0; | |
9310 | argv = argv_split(GFP_KERNEL, buf, &argc); | |
9311 | if (!argv) | |
9312 | return -ENOMEM; | |
9313 | ||
9314 | if (argc) | |
9315 | ret = createfn(argc, argv); | |
9316 | ||
9317 | argv_free(argv); | |
9318 | ||
9319 | return ret; | |
9320 | } | |
9321 | ||
9322 | #define WRITE_BUFSIZE 4096 | |
9323 | ||
9324 | ssize_t trace_parse_run_command(struct file *file, const char __user *buffer, | |
9325 | size_t count, loff_t *ppos, | |
9326 | int (*createfn)(int, char **)) | |
9327 | { | |
9328 | char *kbuf, *buf, *tmp; | |
9329 | int ret = 0; | |
9330 | size_t done = 0; | |
9331 | size_t size; | |
9332 | ||
9333 | kbuf = kmalloc(WRITE_BUFSIZE, GFP_KERNEL); | |
9334 | if (!kbuf) | |
9335 | return -ENOMEM; | |
9336 | ||
9337 | while (done < count) { | |
9338 | size = count - done; | |
9339 | ||
9340 | if (size >= WRITE_BUFSIZE) | |
9341 | size = WRITE_BUFSIZE - 1; | |
9342 | ||
9343 | if (copy_from_user(kbuf, buffer + done, size)) { | |
9344 | ret = -EFAULT; | |
9345 | goto out; | |
9346 | } | |
9347 | kbuf[size] = '\0'; | |
9348 | buf = kbuf; | |
9349 | do { | |
9350 | tmp = strchr(buf, '\n'); | |
9351 | if (tmp) { | |
9352 | *tmp = '\0'; | |
9353 | size = tmp - buf + 1; | |
9354 | } else { | |
9355 | size = strlen(buf); | |
9356 | if (done + size < count) { | |
9357 | if (buf != kbuf) | |
9358 | break; | |
9359 | /* This can accept WRITE_BUFSIZE - 2 ('\n' + '\0') */ | |
9360 | pr_warn("Line length is too long: Should be less than %d\n", | |
9361 | WRITE_BUFSIZE - 2); | |
9362 | ret = -EINVAL; | |
9363 | goto out; | |
9364 | } | |
9365 | } | |
9366 | done += size; | |
9367 | ||
9368 | /* Remove comments */ | |
9369 | tmp = strchr(buf, '#'); | |
9370 | ||
9371 | if (tmp) | |
9372 | *tmp = '\0'; | |
9373 | ||
9374 | ret = trace_run_command(buf, createfn); | |
9375 | if (ret) | |
9376 | goto out; | |
9377 | buf += size; | |
9378 | ||
9379 | } while (done < count); | |
9380 | } | |
9381 | ret = done; | |
9382 | ||
9383 | out: | |
9384 | kfree(kbuf); | |
9385 | ||
9386 | return ret; | |
9387 | } | |
9388 | ||
3928a8a2 | 9389 | __init static int tracer_alloc_buffers(void) |
bc0c38d1 | 9390 | { |
73c5162a | 9391 | int ring_buf_size; |
9e01c1b7 | 9392 | int ret = -ENOMEM; |
4c11d7ae | 9393 | |
a356646a SRV |
9394 | |
9395 | if (security_locked_down(LOCKDOWN_TRACEFS)) { | |
ee195452 | 9396 | pr_warn("Tracing disabled due to lockdown\n"); |
a356646a SRV |
9397 | return -EPERM; |
9398 | } | |
9399 | ||
b5e87c05 SRRH |
9400 | /* |
9401 | * Make sure we don't accidently add more trace options | |
9402 | * than we have bits for. | |
9403 | */ | |
9a38a885 | 9404 | BUILD_BUG_ON(TRACE_ITER_LAST_BIT > TRACE_FLAGS_MAX_SIZE); |
b5e87c05 | 9405 | |
9e01c1b7 RR |
9406 | if (!alloc_cpumask_var(&tracing_buffer_mask, GFP_KERNEL)) |
9407 | goto out; | |
9408 | ||
ccfe9e42 | 9409 | if (!alloc_cpumask_var(&global_trace.tracing_cpumask, GFP_KERNEL)) |
9e01c1b7 | 9410 | goto out_free_buffer_mask; |
4c11d7ae | 9411 | |
07d777fe | 9412 | /* Only allocate trace_printk buffers if a trace_printk exists */ |
bf2cbe04 | 9413 | if (&__stop___trace_bprintk_fmt != &__start___trace_bprintk_fmt) |
81698831 | 9414 | /* Must be called before global_trace.buffer is allocated */ |
07d777fe SR |
9415 | trace_printk_init_buffers(); |
9416 | ||
73c5162a SR |
9417 | /* To save memory, keep the ring buffer size to its minimum */ |
9418 | if (ring_buffer_expanded) | |
9419 | ring_buf_size = trace_buf_size; | |
9420 | else | |
9421 | ring_buf_size = 1; | |
9422 | ||
9e01c1b7 | 9423 | cpumask_copy(tracing_buffer_mask, cpu_possible_mask); |
ccfe9e42 | 9424 | cpumask_copy(global_trace.tracing_cpumask, cpu_all_mask); |
9e01c1b7 | 9425 | |
2b6080f2 SR |
9426 | raw_spin_lock_init(&global_trace.start_lock); |
9427 | ||
b32614c0 SAS |
9428 | /* |
9429 | * The prepare callbacks allocates some memory for the ring buffer. We | |
9430 | * don't free the buffer if the if the CPU goes down. If we were to free | |
9431 | * the buffer, then the user would lose any trace that was in the | |
9432 | * buffer. The memory will be removed once the "instance" is removed. | |
9433 | */ | |
9434 | ret = cpuhp_setup_state_multi(CPUHP_TRACE_RB_PREPARE, | |
9435 | "trace/RB:preapre", trace_rb_cpu_prepare, | |
9436 | NULL); | |
9437 | if (ret < 0) | |
9438 | goto out_free_cpumask; | |
2c4a33ab | 9439 | /* Used for event triggers */ |
147d88e0 | 9440 | ret = -ENOMEM; |
2c4a33ab SRRH |
9441 | temp_buffer = ring_buffer_alloc(PAGE_SIZE, RB_FL_OVERWRITE); |
9442 | if (!temp_buffer) | |
b32614c0 | 9443 | goto out_rm_hp_state; |
2c4a33ab | 9444 | |
939c7a4f YY |
9445 | if (trace_create_savedcmd() < 0) |
9446 | goto out_free_temp_buffer; | |
9447 | ||
9e01c1b7 | 9448 | /* TODO: make the number of buffers hot pluggable with CPUS */ |
737223fb | 9449 | if (allocate_trace_buffers(&global_trace, ring_buf_size) < 0) { |
24589e3a | 9450 | MEM_FAIL(1, "tracer: failed to allocate ring buffer!\n"); |
939c7a4f | 9451 | goto out_free_savedcmd; |
4c11d7ae | 9452 | } |
a7603ff4 | 9453 | |
499e5470 SR |
9454 | if (global_trace.buffer_disabled) |
9455 | tracing_off(); | |
4c11d7ae | 9456 | |
e1e232ca SR |
9457 | if (trace_boot_clock) { |
9458 | ret = tracing_set_clock(&global_trace, trace_boot_clock); | |
9459 | if (ret < 0) | |
a395d6a7 JP |
9460 | pr_warn("Trace clock %s not defined, going back to default\n", |
9461 | trace_boot_clock); | |
e1e232ca SR |
9462 | } |
9463 | ||
ca164318 SRRH |
9464 | /* |
9465 | * register_tracer() might reference current_trace, so it | |
9466 | * needs to be set before we register anything. This is | |
9467 | * just a bootstrap of current_trace anyway. | |
9468 | */ | |
2b6080f2 SR |
9469 | global_trace.current_trace = &nop_trace; |
9470 | ||
0b9b12c1 SRRH |
9471 | global_trace.max_lock = (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED; |
9472 | ||
4104d326 SRRH |
9473 | ftrace_init_global_array_ops(&global_trace); |
9474 | ||
9a38a885 SRRH |
9475 | init_trace_flags_index(&global_trace); |
9476 | ||
ca164318 SRRH |
9477 | register_tracer(&nop_trace); |
9478 | ||
dbeafd0d SRV |
9479 | /* Function tracing may start here (via kernel command line) */ |
9480 | init_function_trace(); | |
9481 | ||
60a11774 SR |
9482 | /* All seems OK, enable tracing */ |
9483 | tracing_disabled = 0; | |
3928a8a2 | 9484 | |
3f5a54e3 SR |
9485 | atomic_notifier_chain_register(&panic_notifier_list, |
9486 | &trace_panic_notifier); | |
9487 | ||
9488 | register_die_notifier(&trace_die_notifier); | |
2fc1dfbe | 9489 | |
ae63b31e SR |
9490 | global_trace.flags = TRACE_ARRAY_FL_GLOBAL; |
9491 | ||
9492 | INIT_LIST_HEAD(&global_trace.systems); | |
9493 | INIT_LIST_HEAD(&global_trace.events); | |
067fe038 | 9494 | INIT_LIST_HEAD(&global_trace.hist_vars); |
2f754e77 | 9495 | INIT_LIST_HEAD(&global_trace.err_log); |
ae63b31e SR |
9496 | list_add(&global_trace.list, &ftrace_trace_arrays); |
9497 | ||
a4d1e688 | 9498 | apply_trace_boot_options(); |
7bcfaf54 | 9499 | |
77fd5c15 SRRH |
9500 | register_snapshot_cmd(); |
9501 | ||
2fc1dfbe | 9502 | return 0; |
3f5a54e3 | 9503 | |
939c7a4f YY |
9504 | out_free_savedcmd: |
9505 | free_saved_cmdlines_buffer(savedcmd); | |
2c4a33ab SRRH |
9506 | out_free_temp_buffer: |
9507 | ring_buffer_free(temp_buffer); | |
b32614c0 SAS |
9508 | out_rm_hp_state: |
9509 | cpuhp_remove_multi_state(CPUHP_TRACE_RB_PREPARE); | |
9e01c1b7 | 9510 | out_free_cpumask: |
ccfe9e42 | 9511 | free_cpumask_var(global_trace.tracing_cpumask); |
9e01c1b7 RR |
9512 | out_free_buffer_mask: |
9513 | free_cpumask_var(tracing_buffer_mask); | |
9514 | out: | |
9515 | return ret; | |
bc0c38d1 | 9516 | } |
b2821ae6 | 9517 | |
e725c731 | 9518 | void __init early_trace_init(void) |
5f893b26 | 9519 | { |
0daa2302 SRRH |
9520 | if (tracepoint_printk) { |
9521 | tracepoint_print_iter = | |
9522 | kmalloc(sizeof(*tracepoint_print_iter), GFP_KERNEL); | |
24589e3a SRV |
9523 | if (MEM_FAIL(!tracepoint_print_iter, |
9524 | "Failed to allocate trace iterator\n")) | |
0daa2302 | 9525 | tracepoint_printk = 0; |
42391745 SRRH |
9526 | else |
9527 | static_key_enable(&tracepoint_printk_key.key); | |
0daa2302 | 9528 | } |
5f893b26 | 9529 | tracer_alloc_buffers(); |
e725c731 SRV |
9530 | } |
9531 | ||
9532 | void __init trace_init(void) | |
9533 | { | |
0c564a53 | 9534 | trace_event_init(); |
5f893b26 SRRH |
9535 | } |
9536 | ||
b2821ae6 SR |
9537 | __init static int clear_boot_tracer(void) |
9538 | { | |
9539 | /* | |
9540 | * The default tracer at boot buffer is an init section. | |
9541 | * This function is called in lateinit. If we did not | |
9542 | * find the boot tracer, then clear it out, to prevent | |
9543 | * later registration from accessing the buffer that is | |
9544 | * about to be freed. | |
9545 | */ | |
9546 | if (!default_bootup_tracer) | |
9547 | return 0; | |
9548 | ||
9549 | printk(KERN_INFO "ftrace bootup tracer '%s' not registered.\n", | |
9550 | default_bootup_tracer); | |
9551 | default_bootup_tracer = NULL; | |
9552 | ||
9553 | return 0; | |
9554 | } | |
9555 | ||
8434dc93 | 9556 | fs_initcall(tracer_init_tracefs); |
4bb0f0e7 | 9557 | late_initcall_sync(clear_boot_tracer); |
3fd49c9e CW |
9558 | |
9559 | #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK | |
9560 | __init static int tracing_set_default_clock(void) | |
9561 | { | |
9562 | /* sched_clock_stable() is determined in late_initcall */ | |
5125eee4 | 9563 | if (!trace_boot_clock && !sched_clock_stable()) { |
bf24daac MI |
9564 | if (security_locked_down(LOCKDOWN_TRACEFS)) { |
9565 | pr_warn("Can not set tracing clock due to lockdown\n"); | |
9566 | return -EPERM; | |
9567 | } | |
9568 | ||
3fd49c9e CW |
9569 | printk(KERN_WARNING |
9570 | "Unstable clock detected, switching default tracing clock to \"global\"\n" | |
9571 | "If you want to keep using the local clock, then add:\n" | |
9572 | " \"trace_clock=local\"\n" | |
9573 | "on the kernel command line\n"); | |
9574 | tracing_set_clock(&global_trace, "global"); | |
9575 | } | |
9576 | ||
9577 | return 0; | |
9578 | } | |
9579 | late_initcall_sync(tracing_set_default_clock); | |
9580 | #endif |