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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 SR |
19 | #include <linux/kallsyms.h> |
20 | #include <linux/seq_file.h> | |
3f5a54e3 | 21 | #include <linux/notifier.h> |
2cadf913 | 22 | #include <linux/irqflags.h> |
bc0c38d1 | 23 | #include <linux/debugfs.h> |
8434dc93 | 24 | #include <linux/tracefs.h> |
4c11d7ae | 25 | #include <linux/pagemap.h> |
bc0c38d1 SR |
26 | #include <linux/hardirq.h> |
27 | #include <linux/linkage.h> | |
28 | #include <linux/uaccess.h> | |
76c813e2 | 29 | #include <linux/vmalloc.h> |
bc0c38d1 SR |
30 | #include <linux/ftrace.h> |
31 | #include <linux/module.h> | |
32 | #include <linux/percpu.h> | |
2cadf913 | 33 | #include <linux/splice.h> |
3f5a54e3 | 34 | #include <linux/kdebug.h> |
5f0c6c03 | 35 | #include <linux/string.h> |
f76180bc | 36 | #include <linux/mount.h> |
7e53bd42 | 37 | #include <linux/rwsem.h> |
5a0e3ad6 | 38 | #include <linux/slab.h> |
bc0c38d1 SR |
39 | #include <linux/ctype.h> |
40 | #include <linux/init.h> | |
2a2cc8f7 | 41 | #include <linux/poll.h> |
b892e5c8 | 42 | #include <linux/nmi.h> |
bc0c38d1 | 43 | #include <linux/fs.h> |
478409dd | 44 | #include <linux/trace.h> |
3fd49c9e | 45 | #include <linux/sched/clock.h> |
8bd75c77 | 46 | #include <linux/sched/rt.h> |
86387f7e | 47 | |
bc0c38d1 | 48 | #include "trace.h" |
f0868d1e | 49 | #include "trace_output.h" |
bc0c38d1 | 50 | |
73c5162a SR |
51 | /* |
52 | * On boot up, the ring buffer is set to the minimum size, so that | |
53 | * we do not waste memory on systems that are not using tracing. | |
54 | */ | |
55034cd6 | 55 | bool ring_buffer_expanded; |
73c5162a | 56 | |
8e1b82e0 FW |
57 | /* |
58 | * We need to change this state when a selftest is running. | |
ff32504f FW |
59 | * A selftest will lurk into the ring-buffer to count the |
60 | * entries inserted during the selftest although some concurrent | |
5e1607a0 | 61 | * insertions into the ring-buffer such as trace_printk could occurred |
ff32504f FW |
62 | * at the same time, giving false positive or negative results. |
63 | */ | |
8e1b82e0 | 64 | static bool __read_mostly tracing_selftest_running; |
ff32504f | 65 | |
b2821ae6 SR |
66 | /* |
67 | * If a tracer is running, we do not want to run SELFTEST. | |
68 | */ | |
020e5f85 | 69 | bool __read_mostly tracing_selftest_disabled; |
b2821ae6 | 70 | |
0daa2302 SRRH |
71 | /* Pipe tracepoints to printk */ |
72 | struct trace_iterator *tracepoint_print_iter; | |
73 | int tracepoint_printk; | |
42391745 | 74 | static DEFINE_STATIC_KEY_FALSE(tracepoint_printk_key); |
0daa2302 | 75 | |
adf9f195 FW |
76 | /* For tracers that don't implement custom flags */ |
77 | static struct tracer_opt dummy_tracer_opt[] = { | |
78 | { } | |
79 | }; | |
80 | ||
8c1a49ae SRRH |
81 | static int |
82 | dummy_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set) | |
adf9f195 FW |
83 | { |
84 | return 0; | |
85 | } | |
0f048701 | 86 | |
7ffbd48d SR |
87 | /* |
88 | * To prevent the comm cache from being overwritten when no | |
89 | * tracing is active, only save the comm when a trace event | |
90 | * occurred. | |
91 | */ | |
d914ba37 | 92 | static DEFINE_PER_CPU(bool, trace_taskinfo_save); |
7ffbd48d | 93 | |
0f048701 SR |
94 | /* |
95 | * Kill all tracing for good (never come back). | |
96 | * It is initialized to 1 but will turn to zero if the initialization | |
97 | * of the tracer is successful. But that is the only place that sets | |
98 | * this back to zero. | |
99 | */ | |
4fd27358 | 100 | static int tracing_disabled = 1; |
0f048701 | 101 | |
955b61e5 | 102 | cpumask_var_t __read_mostly tracing_buffer_mask; |
ab46428c | 103 | |
944ac425 SR |
104 | /* |
105 | * ftrace_dump_on_oops - variable to dump ftrace buffer on oops | |
106 | * | |
107 | * If there is an oops (or kernel panic) and the ftrace_dump_on_oops | |
108 | * is set, then ftrace_dump is called. This will output the contents | |
109 | * of the ftrace buffers to the console. This is very useful for | |
110 | * capturing traces that lead to crashes and outputing it to a | |
111 | * serial console. | |
112 | * | |
113 | * It is default off, but you can enable it with either specifying | |
114 | * "ftrace_dump_on_oops" in the kernel command line, or setting | |
cecbca96 FW |
115 | * /proc/sys/kernel/ftrace_dump_on_oops |
116 | * Set 1 if you want to dump buffers of all CPUs | |
117 | * Set 2 if you want to dump the buffer of the CPU that triggered oops | |
944ac425 | 118 | */ |
cecbca96 FW |
119 | |
120 | enum ftrace_dump_mode ftrace_dump_on_oops; | |
944ac425 | 121 | |
de7edd31 SRRH |
122 | /* When set, tracing will stop when a WARN*() is hit */ |
123 | int __disable_trace_on_warning; | |
124 | ||
681bec03 JL |
125 | #ifdef CONFIG_TRACE_EVAL_MAP_FILE |
126 | /* Map of enums to their values, for "eval_map" file */ | |
23bf8cb8 | 127 | struct trace_eval_map_head { |
9828413d SRRH |
128 | struct module *mod; |
129 | unsigned long length; | |
130 | }; | |
131 | ||
23bf8cb8 | 132 | union trace_eval_map_item; |
9828413d | 133 | |
23bf8cb8 | 134 | struct trace_eval_map_tail { |
9828413d SRRH |
135 | /* |
136 | * "end" is first and points to NULL as it must be different | |
00f4b652 | 137 | * than "mod" or "eval_string" |
9828413d | 138 | */ |
23bf8cb8 | 139 | union trace_eval_map_item *next; |
9828413d SRRH |
140 | const char *end; /* points to NULL */ |
141 | }; | |
142 | ||
1793ed93 | 143 | static DEFINE_MUTEX(trace_eval_mutex); |
9828413d SRRH |
144 | |
145 | /* | |
23bf8cb8 | 146 | * The trace_eval_maps are saved in an array with two extra elements, |
9828413d SRRH |
147 | * one at the beginning, and one at the end. The beginning item contains |
148 | * the count of the saved maps (head.length), and the module they | |
149 | * belong to if not built in (head.mod). The ending item contains a | |
681bec03 | 150 | * pointer to the next array of saved eval_map items. |
9828413d | 151 | */ |
23bf8cb8 | 152 | union trace_eval_map_item { |
00f4b652 | 153 | struct trace_eval_map map; |
23bf8cb8 JL |
154 | struct trace_eval_map_head head; |
155 | struct trace_eval_map_tail tail; | |
9828413d SRRH |
156 | }; |
157 | ||
23bf8cb8 | 158 | static union trace_eval_map_item *trace_eval_maps; |
681bec03 | 159 | #endif /* CONFIG_TRACE_EVAL_MAP_FILE */ |
9828413d | 160 | |
607e2ea1 | 161 | static int tracing_set_tracer(struct trace_array *tr, const char *buf); |
b2821ae6 | 162 | |
ee6c2c1b LZ |
163 | #define MAX_TRACER_SIZE 100 |
164 | static char bootup_tracer_buf[MAX_TRACER_SIZE] __initdata; | |
b2821ae6 | 165 | static char *default_bootup_tracer; |
d9e54076 | 166 | |
55034cd6 SRRH |
167 | static bool allocate_snapshot; |
168 | ||
1beee96b | 169 | static int __init set_cmdline_ftrace(char *str) |
d9e54076 | 170 | { |
67012ab1 | 171 | strlcpy(bootup_tracer_buf, str, MAX_TRACER_SIZE); |
b2821ae6 | 172 | default_bootup_tracer = bootup_tracer_buf; |
73c5162a | 173 | /* We are using ftrace early, expand it */ |
55034cd6 | 174 | ring_buffer_expanded = true; |
d9e54076 PZ |
175 | return 1; |
176 | } | |
1beee96b | 177 | __setup("ftrace=", set_cmdline_ftrace); |
d9e54076 | 178 | |
944ac425 SR |
179 | static int __init set_ftrace_dump_on_oops(char *str) |
180 | { | |
cecbca96 FW |
181 | if (*str++ != '=' || !*str) { |
182 | ftrace_dump_on_oops = DUMP_ALL; | |
183 | return 1; | |
184 | } | |
185 | ||
186 | if (!strcmp("orig_cpu", str)) { | |
187 | ftrace_dump_on_oops = DUMP_ORIG; | |
188 | return 1; | |
189 | } | |
190 | ||
191 | return 0; | |
944ac425 SR |
192 | } |
193 | __setup("ftrace_dump_on_oops", set_ftrace_dump_on_oops); | |
60a11774 | 194 | |
de7edd31 SRRH |
195 | static int __init stop_trace_on_warning(char *str) |
196 | { | |
933ff9f2 LCG |
197 | if ((strcmp(str, "=0") != 0 && strcmp(str, "=off") != 0)) |
198 | __disable_trace_on_warning = 1; | |
de7edd31 SRRH |
199 | return 1; |
200 | } | |
933ff9f2 | 201 | __setup("traceoff_on_warning", stop_trace_on_warning); |
de7edd31 | 202 | |
3209cff4 | 203 | static int __init boot_alloc_snapshot(char *str) |
55034cd6 SRRH |
204 | { |
205 | allocate_snapshot = true; | |
206 | /* We also need the main ring buffer expanded */ | |
207 | ring_buffer_expanded = true; | |
208 | return 1; | |
209 | } | |
3209cff4 | 210 | __setup("alloc_snapshot", boot_alloc_snapshot); |
55034cd6 | 211 | |
7bcfaf54 SR |
212 | |
213 | static char trace_boot_options_buf[MAX_TRACER_SIZE] __initdata; | |
7bcfaf54 SR |
214 | |
215 | static int __init set_trace_boot_options(char *str) | |
216 | { | |
67012ab1 | 217 | strlcpy(trace_boot_options_buf, str, MAX_TRACER_SIZE); |
7bcfaf54 SR |
218 | return 0; |
219 | } | |
220 | __setup("trace_options=", set_trace_boot_options); | |
221 | ||
e1e232ca SR |
222 | static char trace_boot_clock_buf[MAX_TRACER_SIZE] __initdata; |
223 | static char *trace_boot_clock __initdata; | |
224 | ||
225 | static int __init set_trace_boot_clock(char *str) | |
226 | { | |
227 | strlcpy(trace_boot_clock_buf, str, MAX_TRACER_SIZE); | |
228 | trace_boot_clock = trace_boot_clock_buf; | |
229 | return 0; | |
230 | } | |
231 | __setup("trace_clock=", set_trace_boot_clock); | |
232 | ||
0daa2302 SRRH |
233 | static int __init set_tracepoint_printk(char *str) |
234 | { | |
235 | if ((strcmp(str, "=0") != 0 && strcmp(str, "=off") != 0)) | |
236 | tracepoint_printk = 1; | |
237 | return 1; | |
238 | } | |
239 | __setup("tp_printk", set_tracepoint_printk); | |
de7edd31 | 240 | |
a5a1d1c2 | 241 | unsigned long long ns2usecs(u64 nsec) |
bc0c38d1 SR |
242 | { |
243 | nsec += 500; | |
244 | do_div(nsec, 1000); | |
245 | return nsec; | |
246 | } | |
247 | ||
983f938a SRRH |
248 | /* trace_flags holds trace_options default values */ |
249 | #define TRACE_DEFAULT_FLAGS \ | |
250 | (FUNCTION_DEFAULT_FLAGS | \ | |
251 | TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK | \ | |
252 | TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO | \ | |
253 | TRACE_ITER_RECORD_CMD | TRACE_ITER_OVERWRITE | \ | |
254 | TRACE_ITER_IRQ_INFO | TRACE_ITER_MARKERS) | |
255 | ||
16270145 SRRH |
256 | /* trace_options that are only supported by global_trace */ |
257 | #define TOP_LEVEL_TRACE_FLAGS (TRACE_ITER_PRINTK | \ | |
258 | TRACE_ITER_PRINTK_MSGONLY | TRACE_ITER_RECORD_CMD) | |
259 | ||
20550622 SRRH |
260 | /* trace_flags that are default zero for instances */ |
261 | #define ZEROED_TRACE_FLAGS \ | |
1e10486f | 262 | (TRACE_ITER_EVENT_FORK | TRACE_ITER_FUNC_FORK) |
16270145 | 263 | |
4fcdae83 | 264 | /* |
67d04bb2 JF |
265 | * The global_trace is the descriptor that holds the top-level tracing |
266 | * buffers for the live tracing. | |
4fcdae83 | 267 | */ |
983f938a SRRH |
268 | static struct trace_array global_trace = { |
269 | .trace_flags = TRACE_DEFAULT_FLAGS, | |
270 | }; | |
bc0c38d1 | 271 | |
ae63b31e | 272 | LIST_HEAD(ftrace_trace_arrays); |
bc0c38d1 | 273 | |
ff451961 SRRH |
274 | int trace_array_get(struct trace_array *this_tr) |
275 | { | |
276 | struct trace_array *tr; | |
277 | int ret = -ENODEV; | |
278 | ||
279 | mutex_lock(&trace_types_lock); | |
280 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
281 | if (tr == this_tr) { | |
282 | tr->ref++; | |
283 | ret = 0; | |
284 | break; | |
285 | } | |
286 | } | |
287 | mutex_unlock(&trace_types_lock); | |
288 | ||
289 | return ret; | |
290 | } | |
291 | ||
292 | static void __trace_array_put(struct trace_array *this_tr) | |
293 | { | |
294 | WARN_ON(!this_tr->ref); | |
295 | this_tr->ref--; | |
296 | } | |
297 | ||
298 | void trace_array_put(struct trace_array *this_tr) | |
299 | { | |
300 | mutex_lock(&trace_types_lock); | |
301 | __trace_array_put(this_tr); | |
302 | mutex_unlock(&trace_types_lock); | |
303 | } | |
304 | ||
2425bcb9 | 305 | int call_filter_check_discard(struct trace_event_call *call, void *rec, |
f306cc82 TZ |
306 | struct ring_buffer *buffer, |
307 | struct ring_buffer_event *event) | |
308 | { | |
309 | if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) && | |
310 | !filter_match_preds(call->filter, rec)) { | |
0fc1b09f | 311 | __trace_event_discard_commit(buffer, event); |
f306cc82 TZ |
312 | return 1; |
313 | } | |
314 | ||
315 | return 0; | |
eb02ce01 TZ |
316 | } |
317 | ||
76c813e2 SRRH |
318 | void trace_free_pid_list(struct trace_pid_list *pid_list) |
319 | { | |
320 | vfree(pid_list->pids); | |
321 | kfree(pid_list); | |
322 | } | |
323 | ||
d8275c45 SR |
324 | /** |
325 | * trace_find_filtered_pid - check if a pid exists in a filtered_pid list | |
326 | * @filtered_pids: The list of pids to check | |
327 | * @search_pid: The PID to find in @filtered_pids | |
328 | * | |
329 | * Returns true if @search_pid is fonud in @filtered_pids, and false otherwis. | |
330 | */ | |
331 | bool | |
332 | trace_find_filtered_pid(struct trace_pid_list *filtered_pids, pid_t search_pid) | |
333 | { | |
334 | /* | |
335 | * If pid_max changed after filtered_pids was created, we | |
336 | * by default ignore all pids greater than the previous pid_max. | |
337 | */ | |
338 | if (search_pid >= filtered_pids->pid_max) | |
339 | return false; | |
340 | ||
341 | return test_bit(search_pid, filtered_pids->pids); | |
342 | } | |
343 | ||
344 | /** | |
345 | * trace_ignore_this_task - should a task be ignored for tracing | |
346 | * @filtered_pids: The list of pids to check | |
347 | * @task: The task that should be ignored if not filtered | |
348 | * | |
349 | * Checks if @task should be traced or not from @filtered_pids. | |
350 | * Returns true if @task should *NOT* be traced. | |
351 | * Returns false if @task should be traced. | |
352 | */ | |
353 | bool | |
354 | trace_ignore_this_task(struct trace_pid_list *filtered_pids, struct task_struct *task) | |
355 | { | |
356 | /* | |
357 | * Return false, because if filtered_pids does not exist, | |
358 | * all pids are good to trace. | |
359 | */ | |
360 | if (!filtered_pids) | |
361 | return false; | |
362 | ||
363 | return !trace_find_filtered_pid(filtered_pids, task->pid); | |
364 | } | |
365 | ||
366 | /** | |
5a93bae2 | 367 | * trace_pid_filter_add_remove_task - Add or remove a task from a pid_list |
d8275c45 SR |
368 | * @pid_list: The list to modify |
369 | * @self: The current task for fork or NULL for exit | |
370 | * @task: The task to add or remove | |
371 | * | |
372 | * If adding a task, if @self is defined, the task is only added if @self | |
373 | * is also included in @pid_list. This happens on fork and tasks should | |
374 | * only be added when the parent is listed. If @self is NULL, then the | |
375 | * @task pid will be removed from the list, which would happen on exit | |
376 | * of a task. | |
377 | */ | |
378 | void trace_filter_add_remove_task(struct trace_pid_list *pid_list, | |
379 | struct task_struct *self, | |
380 | struct task_struct *task) | |
381 | { | |
382 | if (!pid_list) | |
383 | return; | |
384 | ||
385 | /* For forks, we only add if the forking task is listed */ | |
386 | if (self) { | |
387 | if (!trace_find_filtered_pid(pid_list, self->pid)) | |
388 | return; | |
389 | } | |
390 | ||
391 | /* Sorry, but we don't support pid_max changing after setting */ | |
392 | if (task->pid >= pid_list->pid_max) | |
393 | return; | |
394 | ||
395 | /* "self" is set for forks, and NULL for exits */ | |
396 | if (self) | |
397 | set_bit(task->pid, pid_list->pids); | |
398 | else | |
399 | clear_bit(task->pid, pid_list->pids); | |
400 | } | |
401 | ||
5cc8976b SRRH |
402 | /** |
403 | * trace_pid_next - Used for seq_file to get to the next pid of a pid_list | |
404 | * @pid_list: The pid list to show | |
405 | * @v: The last pid that was shown (+1 the actual pid to let zero be displayed) | |
406 | * @pos: The position of the file | |
407 | * | |
408 | * This is used by the seq_file "next" operation to iterate the pids | |
409 | * listed in a trace_pid_list structure. | |
410 | * | |
411 | * Returns the pid+1 as we want to display pid of zero, but NULL would | |
412 | * stop the iteration. | |
413 | */ | |
414 | void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos) | |
415 | { | |
416 | unsigned long pid = (unsigned long)v; | |
417 | ||
418 | (*pos)++; | |
419 | ||
420 | /* pid already is +1 of the actual prevous bit */ | |
421 | pid = find_next_bit(pid_list->pids, pid_list->pid_max, pid); | |
422 | ||
423 | /* Return pid + 1 to allow zero to be represented */ | |
424 | if (pid < pid_list->pid_max) | |
425 | return (void *)(pid + 1); | |
426 | ||
427 | return NULL; | |
428 | } | |
429 | ||
430 | /** | |
431 | * trace_pid_start - Used for seq_file to start reading pid lists | |
432 | * @pid_list: The pid list to show | |
433 | * @pos: The position of the file | |
434 | * | |
435 | * This is used by seq_file "start" operation to start the iteration | |
436 | * of listing pids. | |
437 | * | |
438 | * Returns the pid+1 as we want to display pid of zero, but NULL would | |
439 | * stop the iteration. | |
440 | */ | |
441 | void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos) | |
442 | { | |
443 | unsigned long pid; | |
444 | loff_t l = 0; | |
445 | ||
446 | pid = find_first_bit(pid_list->pids, pid_list->pid_max); | |
447 | if (pid >= pid_list->pid_max) | |
448 | return NULL; | |
449 | ||
450 | /* Return pid + 1 so that zero can be the exit value */ | |
451 | for (pid++; pid && l < *pos; | |
452 | pid = (unsigned long)trace_pid_next(pid_list, (void *)pid, &l)) | |
453 | ; | |
454 | return (void *)pid; | |
455 | } | |
456 | ||
457 | /** | |
458 | * trace_pid_show - show the current pid in seq_file processing | |
459 | * @m: The seq_file structure to write into | |
460 | * @v: A void pointer of the pid (+1) value to display | |
461 | * | |
462 | * Can be directly used by seq_file operations to display the current | |
463 | * pid value. | |
464 | */ | |
465 | int trace_pid_show(struct seq_file *m, void *v) | |
466 | { | |
467 | unsigned long pid = (unsigned long)v - 1; | |
468 | ||
469 | seq_printf(m, "%lu\n", pid); | |
470 | return 0; | |
471 | } | |
472 | ||
76c813e2 SRRH |
473 | /* 128 should be much more than enough */ |
474 | #define PID_BUF_SIZE 127 | |
475 | ||
476 | int trace_pid_write(struct trace_pid_list *filtered_pids, | |
477 | struct trace_pid_list **new_pid_list, | |
478 | const char __user *ubuf, size_t cnt) | |
479 | { | |
480 | struct trace_pid_list *pid_list; | |
481 | struct trace_parser parser; | |
482 | unsigned long val; | |
483 | int nr_pids = 0; | |
484 | ssize_t read = 0; | |
485 | ssize_t ret = 0; | |
486 | loff_t pos; | |
487 | pid_t pid; | |
488 | ||
489 | if (trace_parser_get_init(&parser, PID_BUF_SIZE + 1)) | |
490 | return -ENOMEM; | |
491 | ||
492 | /* | |
493 | * Always recreate a new array. The write is an all or nothing | |
494 | * operation. Always create a new array when adding new pids by | |
495 | * the user. If the operation fails, then the current list is | |
496 | * not modified. | |
497 | */ | |
498 | pid_list = kmalloc(sizeof(*pid_list), GFP_KERNEL); | |
499 | if (!pid_list) | |
500 | return -ENOMEM; | |
501 | ||
502 | pid_list->pid_max = READ_ONCE(pid_max); | |
503 | ||
504 | /* Only truncating will shrink pid_max */ | |
505 | if (filtered_pids && filtered_pids->pid_max > pid_list->pid_max) | |
506 | pid_list->pid_max = filtered_pids->pid_max; | |
507 | ||
508 | pid_list->pids = vzalloc((pid_list->pid_max + 7) >> 3); | |
509 | if (!pid_list->pids) { | |
510 | kfree(pid_list); | |
511 | return -ENOMEM; | |
512 | } | |
513 | ||
514 | if (filtered_pids) { | |
515 | /* copy the current bits to the new max */ | |
67f20b08 WY |
516 | for_each_set_bit(pid, filtered_pids->pids, |
517 | filtered_pids->pid_max) { | |
76c813e2 | 518 | set_bit(pid, pid_list->pids); |
76c813e2 SRRH |
519 | nr_pids++; |
520 | } | |
521 | } | |
522 | ||
523 | while (cnt > 0) { | |
524 | ||
525 | pos = 0; | |
526 | ||
527 | ret = trace_get_user(&parser, ubuf, cnt, &pos); | |
528 | if (ret < 0 || !trace_parser_loaded(&parser)) | |
529 | break; | |
530 | ||
531 | read += ret; | |
532 | ubuf += ret; | |
533 | cnt -= ret; | |
534 | ||
76c813e2 SRRH |
535 | ret = -EINVAL; |
536 | if (kstrtoul(parser.buffer, 0, &val)) | |
537 | break; | |
538 | if (val >= pid_list->pid_max) | |
539 | break; | |
540 | ||
541 | pid = (pid_t)val; | |
542 | ||
543 | set_bit(pid, pid_list->pids); | |
544 | nr_pids++; | |
545 | ||
546 | trace_parser_clear(&parser); | |
547 | ret = 0; | |
548 | } | |
549 | trace_parser_put(&parser); | |
550 | ||
551 | if (ret < 0) { | |
552 | trace_free_pid_list(pid_list); | |
553 | return ret; | |
554 | } | |
555 | ||
556 | if (!nr_pids) { | |
557 | /* Cleared the list of pids */ | |
558 | trace_free_pid_list(pid_list); | |
559 | read = ret; | |
560 | pid_list = NULL; | |
561 | } | |
562 | ||
563 | *new_pid_list = pid_list; | |
564 | ||
565 | return read; | |
566 | } | |
567 | ||
a5a1d1c2 | 568 | static u64 buffer_ftrace_now(struct trace_buffer *buf, int cpu) |
37886f6a SR |
569 | { |
570 | u64 ts; | |
571 | ||
572 | /* Early boot up does not have a buffer yet */ | |
9457158b | 573 | if (!buf->buffer) |
37886f6a SR |
574 | return trace_clock_local(); |
575 | ||
9457158b AL |
576 | ts = ring_buffer_time_stamp(buf->buffer, cpu); |
577 | ring_buffer_normalize_time_stamp(buf->buffer, cpu, &ts); | |
37886f6a SR |
578 | |
579 | return ts; | |
580 | } | |
bc0c38d1 | 581 | |
a5a1d1c2 | 582 | u64 ftrace_now(int cpu) |
9457158b AL |
583 | { |
584 | return buffer_ftrace_now(&global_trace.trace_buffer, cpu); | |
585 | } | |
586 | ||
10246fa3 SRRH |
587 | /** |
588 | * tracing_is_enabled - Show if global_trace has been disabled | |
589 | * | |
590 | * Shows if the global trace has been enabled or not. It uses the | |
591 | * mirror flag "buffer_disabled" to be used in fast paths such as for | |
592 | * the irqsoff tracer. But it may be inaccurate due to races. If you | |
593 | * need to know the accurate state, use tracing_is_on() which is a little | |
594 | * slower, but accurate. | |
595 | */ | |
9036990d SR |
596 | int tracing_is_enabled(void) |
597 | { | |
10246fa3 SRRH |
598 | /* |
599 | * For quick access (irqsoff uses this in fast path), just | |
600 | * return the mirror variable of the state of the ring buffer. | |
601 | * It's a little racy, but we don't really care. | |
602 | */ | |
603 | smp_rmb(); | |
604 | return !global_trace.buffer_disabled; | |
9036990d SR |
605 | } |
606 | ||
4fcdae83 | 607 | /* |
3928a8a2 SR |
608 | * trace_buf_size is the size in bytes that is allocated |
609 | * for a buffer. Note, the number of bytes is always rounded | |
610 | * to page size. | |
3f5a54e3 SR |
611 | * |
612 | * This number is purposely set to a low number of 16384. | |
613 | * If the dump on oops happens, it will be much appreciated | |
614 | * to not have to wait for all that output. Anyway this can be | |
615 | * boot time and run time configurable. | |
4fcdae83 | 616 | */ |
3928a8a2 | 617 | #define TRACE_BUF_SIZE_DEFAULT 1441792UL /* 16384 * 88 (sizeof(entry)) */ |
3f5a54e3 | 618 | |
3928a8a2 | 619 | static unsigned long trace_buf_size = TRACE_BUF_SIZE_DEFAULT; |
bc0c38d1 | 620 | |
4fcdae83 | 621 | /* trace_types holds a link list of available tracers. */ |
bc0c38d1 | 622 | static struct tracer *trace_types __read_mostly; |
4fcdae83 | 623 | |
4fcdae83 SR |
624 | /* |
625 | * trace_types_lock is used to protect the trace_types list. | |
4fcdae83 | 626 | */ |
a8227415 | 627 | DEFINE_MUTEX(trace_types_lock); |
4fcdae83 | 628 | |
7e53bd42 LJ |
629 | /* |
630 | * serialize the access of the ring buffer | |
631 | * | |
632 | * ring buffer serializes readers, but it is low level protection. | |
633 | * The validity of the events (which returns by ring_buffer_peek() ..etc) | |
634 | * are not protected by ring buffer. | |
635 | * | |
636 | * The content of events may become garbage if we allow other process consumes | |
637 | * these events concurrently: | |
638 | * A) the page of the consumed events may become a normal page | |
639 | * (not reader page) in ring buffer, and this page will be rewrited | |
640 | * by events producer. | |
641 | * B) The page of the consumed events may become a page for splice_read, | |
642 | * and this page will be returned to system. | |
643 | * | |
644 | * These primitives allow multi process access to different cpu ring buffer | |
645 | * concurrently. | |
646 | * | |
647 | * These primitives don't distinguish read-only and read-consume access. | |
648 | * Multi read-only access are also serialized. | |
649 | */ | |
650 | ||
651 | #ifdef CONFIG_SMP | |
652 | static DECLARE_RWSEM(all_cpu_access_lock); | |
653 | static DEFINE_PER_CPU(struct mutex, cpu_access_lock); | |
654 | ||
655 | static inline void trace_access_lock(int cpu) | |
656 | { | |
ae3b5093 | 657 | if (cpu == RING_BUFFER_ALL_CPUS) { |
7e53bd42 LJ |
658 | /* gain it for accessing the whole ring buffer. */ |
659 | down_write(&all_cpu_access_lock); | |
660 | } else { | |
661 | /* gain it for accessing a cpu ring buffer. */ | |
662 | ||
ae3b5093 | 663 | /* Firstly block other trace_access_lock(RING_BUFFER_ALL_CPUS). */ |
7e53bd42 LJ |
664 | down_read(&all_cpu_access_lock); |
665 | ||
666 | /* Secondly block other access to this @cpu ring buffer. */ | |
667 | mutex_lock(&per_cpu(cpu_access_lock, cpu)); | |
668 | } | |
669 | } | |
670 | ||
671 | static inline void trace_access_unlock(int cpu) | |
672 | { | |
ae3b5093 | 673 | if (cpu == RING_BUFFER_ALL_CPUS) { |
7e53bd42 LJ |
674 | up_write(&all_cpu_access_lock); |
675 | } else { | |
676 | mutex_unlock(&per_cpu(cpu_access_lock, cpu)); | |
677 | up_read(&all_cpu_access_lock); | |
678 | } | |
679 | } | |
680 | ||
681 | static inline void trace_access_lock_init(void) | |
682 | { | |
683 | int cpu; | |
684 | ||
685 | for_each_possible_cpu(cpu) | |
686 | mutex_init(&per_cpu(cpu_access_lock, cpu)); | |
687 | } | |
688 | ||
689 | #else | |
690 | ||
691 | static DEFINE_MUTEX(access_lock); | |
692 | ||
693 | static inline void trace_access_lock(int cpu) | |
694 | { | |
695 | (void)cpu; | |
696 | mutex_lock(&access_lock); | |
697 | } | |
698 | ||
699 | static inline void trace_access_unlock(int cpu) | |
700 | { | |
701 | (void)cpu; | |
702 | mutex_unlock(&access_lock); | |
703 | } | |
704 | ||
705 | static inline void trace_access_lock_init(void) | |
706 | { | |
707 | } | |
708 | ||
709 | #endif | |
710 | ||
d78a4614 SRRH |
711 | #ifdef CONFIG_STACKTRACE |
712 | static void __ftrace_trace_stack(struct ring_buffer *buffer, | |
713 | unsigned long flags, | |
714 | int skip, int pc, struct pt_regs *regs); | |
2d34f489 SRRH |
715 | static inline void ftrace_trace_stack(struct trace_array *tr, |
716 | struct ring_buffer *buffer, | |
73dddbb5 SRRH |
717 | unsigned long flags, |
718 | int skip, int pc, struct pt_regs *regs); | |
ca475e83 | 719 | |
d78a4614 SRRH |
720 | #else |
721 | static inline void __ftrace_trace_stack(struct ring_buffer *buffer, | |
722 | unsigned long flags, | |
723 | int skip, int pc, struct pt_regs *regs) | |
724 | { | |
725 | } | |
2d34f489 SRRH |
726 | static inline void ftrace_trace_stack(struct trace_array *tr, |
727 | struct ring_buffer *buffer, | |
73dddbb5 SRRH |
728 | unsigned long flags, |
729 | int skip, int pc, struct pt_regs *regs) | |
ca475e83 SRRH |
730 | { |
731 | } | |
732 | ||
d78a4614 SRRH |
733 | #endif |
734 | ||
3e9a8aad SRRH |
735 | static __always_inline void |
736 | trace_event_setup(struct ring_buffer_event *event, | |
737 | int type, unsigned long flags, int pc) | |
738 | { | |
739 | struct trace_entry *ent = ring_buffer_event_data(event); | |
740 | ||
741 | tracing_generic_entry_update(ent, flags, pc); | |
742 | ent->type = type; | |
743 | } | |
744 | ||
745 | static __always_inline struct ring_buffer_event * | |
746 | __trace_buffer_lock_reserve(struct ring_buffer *buffer, | |
747 | int type, | |
748 | unsigned long len, | |
749 | unsigned long flags, int pc) | |
750 | { | |
751 | struct ring_buffer_event *event; | |
752 | ||
753 | event = ring_buffer_lock_reserve(buffer, len); | |
754 | if (event != NULL) | |
755 | trace_event_setup(event, type, flags, pc); | |
756 | ||
757 | return event; | |
758 | } | |
759 | ||
2290f2c5 | 760 | void tracer_tracing_on(struct trace_array *tr) |
10246fa3 SRRH |
761 | { |
762 | if (tr->trace_buffer.buffer) | |
763 | ring_buffer_record_on(tr->trace_buffer.buffer); | |
764 | /* | |
765 | * This flag is looked at when buffers haven't been allocated | |
766 | * yet, or by some tracers (like irqsoff), that just want to | |
767 | * know if the ring buffer has been disabled, but it can handle | |
768 | * races of where it gets disabled but we still do a record. | |
769 | * As the check is in the fast path of the tracers, it is more | |
770 | * important to be fast than accurate. | |
771 | */ | |
772 | tr->buffer_disabled = 0; | |
773 | /* Make the flag seen by readers */ | |
774 | smp_wmb(); | |
775 | } | |
776 | ||
499e5470 SR |
777 | /** |
778 | * tracing_on - enable tracing buffers | |
779 | * | |
780 | * This function enables tracing buffers that may have been | |
781 | * disabled with tracing_off. | |
782 | */ | |
783 | void tracing_on(void) | |
784 | { | |
10246fa3 | 785 | tracer_tracing_on(&global_trace); |
499e5470 SR |
786 | } |
787 | EXPORT_SYMBOL_GPL(tracing_on); | |
788 | ||
52ffabe3 SRRH |
789 | |
790 | static __always_inline void | |
791 | __buffer_unlock_commit(struct ring_buffer *buffer, struct ring_buffer_event *event) | |
792 | { | |
d914ba37 | 793 | __this_cpu_write(trace_taskinfo_save, true); |
52ffabe3 SRRH |
794 | |
795 | /* If this is the temp buffer, we need to commit fully */ | |
796 | if (this_cpu_read(trace_buffered_event) == event) { | |
797 | /* Length is in event->array[0] */ | |
798 | ring_buffer_write(buffer, event->array[0], &event->array[1]); | |
799 | /* Release the temp buffer */ | |
800 | this_cpu_dec(trace_buffered_event_cnt); | |
801 | } else | |
802 | ring_buffer_unlock_commit(buffer, event); | |
803 | } | |
804 | ||
09ae7234 SRRH |
805 | /** |
806 | * __trace_puts - write a constant string into the trace buffer. | |
807 | * @ip: The address of the caller | |
808 | * @str: The constant string to write | |
809 | * @size: The size of the string. | |
810 | */ | |
811 | int __trace_puts(unsigned long ip, const char *str, int size) | |
812 | { | |
813 | struct ring_buffer_event *event; | |
814 | struct ring_buffer *buffer; | |
815 | struct print_entry *entry; | |
816 | unsigned long irq_flags; | |
817 | int alloc; | |
8abfb872 J |
818 | int pc; |
819 | ||
983f938a | 820 | if (!(global_trace.trace_flags & TRACE_ITER_PRINTK)) |
f0160a5a J |
821 | return 0; |
822 | ||
8abfb872 | 823 | pc = preempt_count(); |
09ae7234 | 824 | |
3132e107 SRRH |
825 | if (unlikely(tracing_selftest_running || tracing_disabled)) |
826 | return 0; | |
827 | ||
09ae7234 SRRH |
828 | alloc = sizeof(*entry) + size + 2; /* possible \n added */ |
829 | ||
830 | local_save_flags(irq_flags); | |
831 | buffer = global_trace.trace_buffer.buffer; | |
3e9a8aad SRRH |
832 | event = __trace_buffer_lock_reserve(buffer, TRACE_PRINT, alloc, |
833 | irq_flags, pc); | |
09ae7234 SRRH |
834 | if (!event) |
835 | return 0; | |
836 | ||
837 | entry = ring_buffer_event_data(event); | |
838 | entry->ip = ip; | |
839 | ||
840 | memcpy(&entry->buf, str, size); | |
841 | ||
842 | /* Add a newline if necessary */ | |
843 | if (entry->buf[size - 1] != '\n') { | |
844 | entry->buf[size] = '\n'; | |
845 | entry->buf[size + 1] = '\0'; | |
846 | } else | |
847 | entry->buf[size] = '\0'; | |
848 | ||
849 | __buffer_unlock_commit(buffer, event); | |
2d34f489 | 850 | ftrace_trace_stack(&global_trace, buffer, irq_flags, 4, pc, NULL); |
09ae7234 SRRH |
851 | |
852 | return size; | |
853 | } | |
854 | EXPORT_SYMBOL_GPL(__trace_puts); | |
855 | ||
856 | /** | |
857 | * __trace_bputs - write the pointer to a constant string into trace buffer | |
858 | * @ip: The address of the caller | |
859 | * @str: The constant string to write to the buffer to | |
860 | */ | |
861 | int __trace_bputs(unsigned long ip, const char *str) | |
862 | { | |
863 | struct ring_buffer_event *event; | |
864 | struct ring_buffer *buffer; | |
865 | struct bputs_entry *entry; | |
866 | unsigned long irq_flags; | |
867 | int size = sizeof(struct bputs_entry); | |
8abfb872 J |
868 | int pc; |
869 | ||
983f938a | 870 | if (!(global_trace.trace_flags & TRACE_ITER_PRINTK)) |
f0160a5a J |
871 | return 0; |
872 | ||
8abfb872 | 873 | pc = preempt_count(); |
09ae7234 | 874 | |
3132e107 SRRH |
875 | if (unlikely(tracing_selftest_running || tracing_disabled)) |
876 | return 0; | |
877 | ||
09ae7234 SRRH |
878 | local_save_flags(irq_flags); |
879 | buffer = global_trace.trace_buffer.buffer; | |
3e9a8aad SRRH |
880 | event = __trace_buffer_lock_reserve(buffer, TRACE_BPUTS, size, |
881 | irq_flags, pc); | |
09ae7234 SRRH |
882 | if (!event) |
883 | return 0; | |
884 | ||
885 | entry = ring_buffer_event_data(event); | |
886 | entry->ip = ip; | |
887 | entry->str = str; | |
888 | ||
889 | __buffer_unlock_commit(buffer, event); | |
2d34f489 | 890 | ftrace_trace_stack(&global_trace, buffer, irq_flags, 4, pc, NULL); |
09ae7234 SRRH |
891 | |
892 | return 1; | |
893 | } | |
894 | EXPORT_SYMBOL_GPL(__trace_bputs); | |
895 | ||
ad909e21 | 896 | #ifdef CONFIG_TRACER_SNAPSHOT |
a35873a0 | 897 | void tracing_snapshot_instance_cond(struct trace_array *tr, void *cond_data) |
ad909e21 | 898 | { |
ad909e21 SRRH |
899 | struct tracer *tracer = tr->current_trace; |
900 | unsigned long flags; | |
901 | ||
1b22e382 SRRH |
902 | if (in_nmi()) { |
903 | internal_trace_puts("*** SNAPSHOT CALLED FROM NMI CONTEXT ***\n"); | |
904 | internal_trace_puts("*** snapshot is being ignored ***\n"); | |
905 | return; | |
906 | } | |
907 | ||
ad909e21 | 908 | if (!tr->allocated_snapshot) { |
ca268da6 SRRH |
909 | internal_trace_puts("*** SNAPSHOT NOT ALLOCATED ***\n"); |
910 | internal_trace_puts("*** stopping trace here! ***\n"); | |
ad909e21 SRRH |
911 | tracing_off(); |
912 | return; | |
913 | } | |
914 | ||
915 | /* Note, snapshot can not be used when the tracer uses it */ | |
916 | if (tracer->use_max_tr) { | |
ca268da6 SRRH |
917 | internal_trace_puts("*** LATENCY TRACER ACTIVE ***\n"); |
918 | internal_trace_puts("*** Can not use snapshot (sorry) ***\n"); | |
ad909e21 SRRH |
919 | return; |
920 | } | |
921 | ||
922 | local_irq_save(flags); | |
a35873a0 | 923 | update_max_tr(tr, current, smp_processor_id(), cond_data); |
ad909e21 SRRH |
924 | local_irq_restore(flags); |
925 | } | |
cab50379 | 926 | |
a35873a0 TZ |
927 | void tracing_snapshot_instance(struct trace_array *tr) |
928 | { | |
929 | tracing_snapshot_instance_cond(tr, NULL); | |
930 | } | |
931 | ||
cab50379 | 932 | /** |
5a93bae2 | 933 | * tracing_snapshot - take a snapshot of the current buffer. |
cab50379 SRV |
934 | * |
935 | * This causes a swap between the snapshot buffer and the current live | |
936 | * tracing buffer. You can use this to take snapshots of the live | |
937 | * trace when some condition is triggered, but continue to trace. | |
938 | * | |
939 | * Note, make sure to allocate the snapshot with either | |
940 | * a tracing_snapshot_alloc(), or by doing it manually | |
941 | * with: echo 1 > /sys/kernel/debug/tracing/snapshot | |
942 | * | |
943 | * If the snapshot buffer is not allocated, it will stop tracing. | |
944 | * Basically making a permanent snapshot. | |
945 | */ | |
946 | void tracing_snapshot(void) | |
947 | { | |
948 | struct trace_array *tr = &global_trace; | |
949 | ||
950 | tracing_snapshot_instance(tr); | |
951 | } | |
1b22e382 | 952 | EXPORT_SYMBOL_GPL(tracing_snapshot); |
ad909e21 | 953 | |
a35873a0 TZ |
954 | /** |
955 | * tracing_snapshot_cond - conditionally take a snapshot of the current buffer. | |
956 | * @tr: The tracing instance to snapshot | |
957 | * @cond_data: The data to be tested conditionally, and possibly saved | |
958 | * | |
959 | * This is the same as tracing_snapshot() except that the snapshot is | |
960 | * conditional - the snapshot will only happen if the | |
961 | * cond_snapshot.update() implementation receiving the cond_data | |
962 | * returns true, which means that the trace array's cond_snapshot | |
963 | * update() operation used the cond_data to determine whether the | |
964 | * snapshot should be taken, and if it was, presumably saved it along | |
965 | * with the snapshot. | |
966 | */ | |
967 | void tracing_snapshot_cond(struct trace_array *tr, void *cond_data) | |
968 | { | |
969 | tracing_snapshot_instance_cond(tr, cond_data); | |
970 | } | |
971 | EXPORT_SYMBOL_GPL(tracing_snapshot_cond); | |
972 | ||
973 | /** | |
974 | * tracing_snapshot_cond_data - get the user data associated with a snapshot | |
975 | * @tr: The tracing instance | |
976 | * | |
977 | * When the user enables a conditional snapshot using | |
978 | * tracing_snapshot_cond_enable(), the user-defined cond_data is saved | |
979 | * with the snapshot. This accessor is used to retrieve it. | |
980 | * | |
981 | * Should not be called from cond_snapshot.update(), since it takes | |
982 | * the tr->max_lock lock, which the code calling | |
983 | * cond_snapshot.update() has already done. | |
984 | * | |
985 | * Returns the cond_data associated with the trace array's snapshot. | |
986 | */ | |
987 | void *tracing_cond_snapshot_data(struct trace_array *tr) | |
988 | { | |
989 | void *cond_data = NULL; | |
990 | ||
991 | arch_spin_lock(&tr->max_lock); | |
992 | ||
993 | if (tr->cond_snapshot) | |
994 | cond_data = tr->cond_snapshot->cond_data; | |
995 | ||
996 | arch_spin_unlock(&tr->max_lock); | |
997 | ||
998 | return cond_data; | |
999 | } | |
1000 | EXPORT_SYMBOL_GPL(tracing_cond_snapshot_data); | |
1001 | ||
ad909e21 SRRH |
1002 | static int resize_buffer_duplicate_size(struct trace_buffer *trace_buf, |
1003 | struct trace_buffer *size_buf, int cpu_id); | |
3209cff4 SRRH |
1004 | static void set_buffer_entries(struct trace_buffer *buf, unsigned long val); |
1005 | ||
2824f503 | 1006 | int tracing_alloc_snapshot_instance(struct trace_array *tr) |
3209cff4 SRRH |
1007 | { |
1008 | int ret; | |
1009 | ||
1010 | if (!tr->allocated_snapshot) { | |
1011 | ||
1012 | /* allocate spare buffer */ | |
1013 | ret = resize_buffer_duplicate_size(&tr->max_buffer, | |
1014 | &tr->trace_buffer, RING_BUFFER_ALL_CPUS); | |
1015 | if (ret < 0) | |
1016 | return ret; | |
1017 | ||
1018 | tr->allocated_snapshot = true; | |
1019 | } | |
1020 | ||
1021 | return 0; | |
1022 | } | |
1023 | ||
ad1438a0 | 1024 | static void free_snapshot(struct trace_array *tr) |
3209cff4 SRRH |
1025 | { |
1026 | /* | |
1027 | * We don't free the ring buffer. instead, resize it because | |
1028 | * The max_tr ring buffer has some state (e.g. ring->clock) and | |
1029 | * we want preserve it. | |
1030 | */ | |
1031 | ring_buffer_resize(tr->max_buffer.buffer, 1, RING_BUFFER_ALL_CPUS); | |
1032 | set_buffer_entries(&tr->max_buffer, 1); | |
1033 | tracing_reset_online_cpus(&tr->max_buffer); | |
1034 | tr->allocated_snapshot = false; | |
1035 | } | |
ad909e21 | 1036 | |
93e31ffb TZ |
1037 | /** |
1038 | * tracing_alloc_snapshot - allocate snapshot buffer. | |
1039 | * | |
1040 | * This only allocates the snapshot buffer if it isn't already | |
1041 | * allocated - it doesn't also take a snapshot. | |
1042 | * | |
1043 | * This is meant to be used in cases where the snapshot buffer needs | |
1044 | * to be set up for events that can't sleep but need to be able to | |
1045 | * trigger a snapshot. | |
1046 | */ | |
1047 | int tracing_alloc_snapshot(void) | |
1048 | { | |
1049 | struct trace_array *tr = &global_trace; | |
1050 | int ret; | |
1051 | ||
2824f503 | 1052 | ret = tracing_alloc_snapshot_instance(tr); |
93e31ffb TZ |
1053 | WARN_ON(ret < 0); |
1054 | ||
1055 | return ret; | |
1056 | } | |
1057 | EXPORT_SYMBOL_GPL(tracing_alloc_snapshot); | |
1058 | ||
ad909e21 | 1059 | /** |
5a93bae2 | 1060 | * tracing_snapshot_alloc - allocate and take a snapshot of the current buffer. |
ad909e21 | 1061 | * |
5a93bae2 | 1062 | * This is similar to tracing_snapshot(), but it will allocate the |
ad909e21 SRRH |
1063 | * snapshot buffer if it isn't already allocated. Use this only |
1064 | * where it is safe to sleep, as the allocation may sleep. | |
1065 | * | |
1066 | * This causes a swap between the snapshot buffer and the current live | |
1067 | * tracing buffer. You can use this to take snapshots of the live | |
1068 | * trace when some condition is triggered, but continue to trace. | |
1069 | */ | |
1070 | void tracing_snapshot_alloc(void) | |
1071 | { | |
ad909e21 SRRH |
1072 | int ret; |
1073 | ||
93e31ffb TZ |
1074 | ret = tracing_alloc_snapshot(); |
1075 | if (ret < 0) | |
3209cff4 | 1076 | return; |
ad909e21 SRRH |
1077 | |
1078 | tracing_snapshot(); | |
1079 | } | |
1b22e382 | 1080 | EXPORT_SYMBOL_GPL(tracing_snapshot_alloc); |
a35873a0 TZ |
1081 | |
1082 | /** | |
1083 | * tracing_snapshot_cond_enable - enable conditional snapshot for an instance | |
1084 | * @tr: The tracing instance | |
1085 | * @cond_data: User data to associate with the snapshot | |
1086 | * @update: Implementation of the cond_snapshot update function | |
1087 | * | |
1088 | * Check whether the conditional snapshot for the given instance has | |
1089 | * already been enabled, or if the current tracer is already using a | |
1090 | * snapshot; if so, return -EBUSY, else create a cond_snapshot and | |
1091 | * save the cond_data and update function inside. | |
1092 | * | |
1093 | * Returns 0 if successful, error otherwise. | |
1094 | */ | |
1095 | int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, | |
1096 | cond_update_fn_t update) | |
1097 | { | |
1098 | struct cond_snapshot *cond_snapshot; | |
1099 | int ret = 0; | |
1100 | ||
1101 | cond_snapshot = kzalloc(sizeof(*cond_snapshot), GFP_KERNEL); | |
1102 | if (!cond_snapshot) | |
1103 | return -ENOMEM; | |
1104 | ||
1105 | cond_snapshot->cond_data = cond_data; | |
1106 | cond_snapshot->update = update; | |
1107 | ||
1108 | mutex_lock(&trace_types_lock); | |
1109 | ||
1110 | ret = tracing_alloc_snapshot_instance(tr); | |
1111 | if (ret) | |
1112 | goto fail_unlock; | |
1113 | ||
1114 | if (tr->current_trace->use_max_tr) { | |
1115 | ret = -EBUSY; | |
1116 | goto fail_unlock; | |
1117 | } | |
1118 | ||
1119 | if (tr->cond_snapshot) { | |
1120 | ret = -EBUSY; | |
1121 | goto fail_unlock; | |
1122 | } | |
1123 | ||
1124 | arch_spin_lock(&tr->max_lock); | |
1125 | tr->cond_snapshot = cond_snapshot; | |
1126 | arch_spin_unlock(&tr->max_lock); | |
1127 | ||
1128 | mutex_unlock(&trace_types_lock); | |
1129 | ||
1130 | return ret; | |
1131 | ||
1132 | fail_unlock: | |
1133 | mutex_unlock(&trace_types_lock); | |
1134 | kfree(cond_snapshot); | |
1135 | return ret; | |
1136 | } | |
1137 | EXPORT_SYMBOL_GPL(tracing_snapshot_cond_enable); | |
1138 | ||
1139 | /** | |
1140 | * tracing_snapshot_cond_disable - disable conditional snapshot for an instance | |
1141 | * @tr: The tracing instance | |
1142 | * | |
1143 | * Check whether the conditional snapshot for the given instance is | |
1144 | * enabled; if so, free the cond_snapshot associated with it, | |
1145 | * otherwise return -EINVAL. | |
1146 | * | |
1147 | * Returns 0 if successful, error otherwise. | |
1148 | */ | |
1149 | int tracing_snapshot_cond_disable(struct trace_array *tr) | |
1150 | { | |
1151 | int ret = 0; | |
1152 | ||
1153 | arch_spin_lock(&tr->max_lock); | |
1154 | ||
1155 | if (!tr->cond_snapshot) | |
1156 | ret = -EINVAL; | |
1157 | else { | |
1158 | kfree(tr->cond_snapshot); | |
1159 | tr->cond_snapshot = NULL; | |
1160 | } | |
1161 | ||
1162 | arch_spin_unlock(&tr->max_lock); | |
1163 | ||
1164 | return ret; | |
1165 | } | |
1166 | EXPORT_SYMBOL_GPL(tracing_snapshot_cond_disable); | |
ad909e21 SRRH |
1167 | #else |
1168 | void tracing_snapshot(void) | |
1169 | { | |
1170 | WARN_ONCE(1, "Snapshot feature not enabled, but internal snapshot used"); | |
1171 | } | |
1b22e382 | 1172 | EXPORT_SYMBOL_GPL(tracing_snapshot); |
a35873a0 TZ |
1173 | void tracing_snapshot_cond(struct trace_array *tr, void *cond_data) |
1174 | { | |
1175 | WARN_ONCE(1, "Snapshot feature not enabled, but internal conditional snapshot used"); | |
1176 | } | |
1177 | EXPORT_SYMBOL_GPL(tracing_snapshot_cond); | |
93e31ffb TZ |
1178 | int tracing_alloc_snapshot(void) |
1179 | { | |
1180 | WARN_ONCE(1, "Snapshot feature not enabled, but snapshot allocation used"); | |
1181 | return -ENODEV; | |
1182 | } | |
1183 | EXPORT_SYMBOL_GPL(tracing_alloc_snapshot); | |
ad909e21 SRRH |
1184 | void tracing_snapshot_alloc(void) |
1185 | { | |
1186 | /* Give warning */ | |
1187 | tracing_snapshot(); | |
1188 | } | |
1b22e382 | 1189 | EXPORT_SYMBOL_GPL(tracing_snapshot_alloc); |
a35873a0 TZ |
1190 | void *tracing_cond_snapshot_data(struct trace_array *tr) |
1191 | { | |
1192 | return NULL; | |
1193 | } | |
1194 | EXPORT_SYMBOL_GPL(tracing_cond_snapshot_data); | |
1195 | int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update) | |
1196 | { | |
1197 | return -ENODEV; | |
1198 | } | |
1199 | EXPORT_SYMBOL_GPL(tracing_snapshot_cond_enable); | |
1200 | int tracing_snapshot_cond_disable(struct trace_array *tr) | |
1201 | { | |
1202 | return false; | |
1203 | } | |
1204 | EXPORT_SYMBOL_GPL(tracing_snapshot_cond_disable); | |
ad909e21 SRRH |
1205 | #endif /* CONFIG_TRACER_SNAPSHOT */ |
1206 | ||
2290f2c5 | 1207 | void tracer_tracing_off(struct trace_array *tr) |
10246fa3 SRRH |
1208 | { |
1209 | if (tr->trace_buffer.buffer) | |
1210 | ring_buffer_record_off(tr->trace_buffer.buffer); | |
1211 | /* | |
1212 | * This flag is looked at when buffers haven't been allocated | |
1213 | * yet, or by some tracers (like irqsoff), that just want to | |
1214 | * know if the ring buffer has been disabled, but it can handle | |
1215 | * races of where it gets disabled but we still do a record. | |
1216 | * As the check is in the fast path of the tracers, it is more | |
1217 | * important to be fast than accurate. | |
1218 | */ | |
1219 | tr->buffer_disabled = 1; | |
1220 | /* Make the flag seen by readers */ | |
1221 | smp_wmb(); | |
1222 | } | |
1223 | ||
499e5470 SR |
1224 | /** |
1225 | * tracing_off - turn off tracing buffers | |
1226 | * | |
1227 | * This function stops the tracing buffers from recording data. | |
1228 | * It does not disable any overhead the tracers themselves may | |
1229 | * be causing. This function simply causes all recording to | |
1230 | * the ring buffers to fail. | |
1231 | */ | |
1232 | void tracing_off(void) | |
1233 | { | |
10246fa3 | 1234 | tracer_tracing_off(&global_trace); |
499e5470 SR |
1235 | } |
1236 | EXPORT_SYMBOL_GPL(tracing_off); | |
1237 | ||
de7edd31 SRRH |
1238 | void disable_trace_on_warning(void) |
1239 | { | |
1240 | if (__disable_trace_on_warning) | |
1241 | tracing_off(); | |
1242 | } | |
1243 | ||
10246fa3 SRRH |
1244 | /** |
1245 | * tracer_tracing_is_on - show real state of ring buffer enabled | |
1246 | * @tr : the trace array to know if ring buffer is enabled | |
1247 | * | |
1248 | * Shows real state of the ring buffer if it is enabled or not. | |
1249 | */ | |
ec573508 | 1250 | bool tracer_tracing_is_on(struct trace_array *tr) |
10246fa3 SRRH |
1251 | { |
1252 | if (tr->trace_buffer.buffer) | |
1253 | return ring_buffer_record_is_on(tr->trace_buffer.buffer); | |
1254 | return !tr->buffer_disabled; | |
1255 | } | |
1256 | ||
499e5470 SR |
1257 | /** |
1258 | * tracing_is_on - show state of ring buffers enabled | |
1259 | */ | |
1260 | int tracing_is_on(void) | |
1261 | { | |
10246fa3 | 1262 | return tracer_tracing_is_on(&global_trace); |
499e5470 SR |
1263 | } |
1264 | EXPORT_SYMBOL_GPL(tracing_is_on); | |
1265 | ||
3928a8a2 | 1266 | static int __init set_buf_size(char *str) |
bc0c38d1 | 1267 | { |
3928a8a2 | 1268 | unsigned long buf_size; |
c6caeeb1 | 1269 | |
bc0c38d1 SR |
1270 | if (!str) |
1271 | return 0; | |
9d612bef | 1272 | buf_size = memparse(str, &str); |
c6caeeb1 | 1273 | /* nr_entries can not be zero */ |
9d612bef | 1274 | if (buf_size == 0) |
c6caeeb1 | 1275 | return 0; |
3928a8a2 | 1276 | trace_buf_size = buf_size; |
bc0c38d1 SR |
1277 | return 1; |
1278 | } | |
3928a8a2 | 1279 | __setup("trace_buf_size=", set_buf_size); |
bc0c38d1 | 1280 | |
0e950173 TB |
1281 | static int __init set_tracing_thresh(char *str) |
1282 | { | |
87abb3b1 | 1283 | unsigned long threshold; |
0e950173 TB |
1284 | int ret; |
1285 | ||
1286 | if (!str) | |
1287 | return 0; | |
bcd83ea6 | 1288 | ret = kstrtoul(str, 0, &threshold); |
0e950173 TB |
1289 | if (ret < 0) |
1290 | return 0; | |
87abb3b1 | 1291 | tracing_thresh = threshold * 1000; |
0e950173 TB |
1292 | return 1; |
1293 | } | |
1294 | __setup("tracing_thresh=", set_tracing_thresh); | |
1295 | ||
57f50be1 SR |
1296 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
1297 | { | |
1298 | return nsecs / 1000; | |
1299 | } | |
1300 | ||
a3418a36 SRRH |
1301 | /* |
1302 | * TRACE_FLAGS is defined as a tuple matching bit masks with strings. | |
f57a4143 | 1303 | * It uses C(a, b) where 'a' is the eval (enum) name and 'b' is the string that |
a3418a36 | 1304 | * matches it. By defining "C(a, b) b", TRACE_FLAGS becomes a list |
f57a4143 | 1305 | * of strings in the order that the evals (enum) were defined. |
a3418a36 SRRH |
1306 | */ |
1307 | #undef C | |
1308 | #define C(a, b) b | |
1309 | ||
4fcdae83 | 1310 | /* These must match the bit postions in trace_iterator_flags */ |
bc0c38d1 | 1311 | static const char *trace_options[] = { |
a3418a36 | 1312 | TRACE_FLAGS |
bc0c38d1 SR |
1313 | NULL |
1314 | }; | |
1315 | ||
5079f326 Z |
1316 | static struct { |
1317 | u64 (*func)(void); | |
1318 | const char *name; | |
8be0709f | 1319 | int in_ns; /* is this clock in nanoseconds? */ |
5079f326 | 1320 | } trace_clocks[] = { |
1b3e5c09 TG |
1321 | { trace_clock_local, "local", 1 }, |
1322 | { trace_clock_global, "global", 1 }, | |
1323 | { trace_clock_counter, "counter", 0 }, | |
e7fda6c4 | 1324 | { trace_clock_jiffies, "uptime", 0 }, |
1b3e5c09 TG |
1325 | { trace_clock, "perf", 1 }, |
1326 | { ktime_get_mono_fast_ns, "mono", 1 }, | |
aabfa5f2 | 1327 | { ktime_get_raw_fast_ns, "mono_raw", 1 }, |
a3ed0e43 | 1328 | { ktime_get_boot_fast_ns, "boot", 1 }, |
8cbd9cc6 | 1329 | ARCH_TRACE_CLOCKS |
5079f326 Z |
1330 | }; |
1331 | ||
860f9f6b TZ |
1332 | bool trace_clock_in_ns(struct trace_array *tr) |
1333 | { | |
1334 | if (trace_clocks[tr->clock_id].in_ns) | |
1335 | return true; | |
1336 | ||
1337 | return false; | |
1338 | } | |
1339 | ||
b63f39ea | 1340 | /* |
1341 | * trace_parser_get_init - gets the buffer for trace parser | |
1342 | */ | |
1343 | int trace_parser_get_init(struct trace_parser *parser, int size) | |
1344 | { | |
1345 | memset(parser, 0, sizeof(*parser)); | |
1346 | ||
1347 | parser->buffer = kmalloc(size, GFP_KERNEL); | |
1348 | if (!parser->buffer) | |
1349 | return 1; | |
1350 | ||
1351 | parser->size = size; | |
1352 | return 0; | |
1353 | } | |
1354 | ||
1355 | /* | |
1356 | * trace_parser_put - frees the buffer for trace parser | |
1357 | */ | |
1358 | void trace_parser_put(struct trace_parser *parser) | |
1359 | { | |
1360 | kfree(parser->buffer); | |
0e684b65 | 1361 | parser->buffer = NULL; |
b63f39ea | 1362 | } |
1363 | ||
1364 | /* | |
1365 | * trace_get_user - reads the user input string separated by space | |
1366 | * (matched by isspace(ch)) | |
1367 | * | |
1368 | * For each string found the 'struct trace_parser' is updated, | |
1369 | * and the function returns. | |
1370 | * | |
1371 | * Returns number of bytes read. | |
1372 | * | |
1373 | * See kernel/trace/trace.h for 'struct trace_parser' details. | |
1374 | */ | |
1375 | int trace_get_user(struct trace_parser *parser, const char __user *ubuf, | |
1376 | size_t cnt, loff_t *ppos) | |
1377 | { | |
1378 | char ch; | |
1379 | size_t read = 0; | |
1380 | ssize_t ret; | |
1381 | ||
1382 | if (!*ppos) | |
1383 | trace_parser_clear(parser); | |
1384 | ||
1385 | ret = get_user(ch, ubuf++); | |
1386 | if (ret) | |
1387 | goto out; | |
1388 | ||
1389 | read++; | |
1390 | cnt--; | |
1391 | ||
1392 | /* | |
1393 | * The parser is not finished with the last write, | |
1394 | * continue reading the user input without skipping spaces. | |
1395 | */ | |
1396 | if (!parser->cont) { | |
1397 | /* skip white space */ | |
1398 | while (cnt && isspace(ch)) { | |
1399 | ret = get_user(ch, ubuf++); | |
1400 | if (ret) | |
1401 | goto out; | |
1402 | read++; | |
1403 | cnt--; | |
1404 | } | |
1405 | ||
76638d96 CD |
1406 | parser->idx = 0; |
1407 | ||
b63f39ea | 1408 | /* only spaces were written */ |
921a7acd | 1409 | if (isspace(ch) || !ch) { |
b63f39ea | 1410 | *ppos += read; |
1411 | ret = read; | |
1412 | goto out; | |
1413 | } | |
b63f39ea | 1414 | } |
1415 | ||
1416 | /* read the non-space input */ | |
921a7acd | 1417 | while (cnt && !isspace(ch) && ch) { |
3c235a33 | 1418 | if (parser->idx < parser->size - 1) |
b63f39ea | 1419 | parser->buffer[parser->idx++] = ch; |
1420 | else { | |
1421 | ret = -EINVAL; | |
1422 | goto out; | |
1423 | } | |
1424 | ret = get_user(ch, ubuf++); | |
1425 | if (ret) | |
1426 | goto out; | |
1427 | read++; | |
1428 | cnt--; | |
1429 | } | |
1430 | ||
1431 | /* We either got finished input or we have to wait for another call. */ | |
921a7acd | 1432 | if (isspace(ch) || !ch) { |
b63f39ea | 1433 | parser->buffer[parser->idx] = 0; |
1434 | parser->cont = false; | |
057db848 | 1435 | } else if (parser->idx < parser->size - 1) { |
b63f39ea | 1436 | parser->cont = true; |
1437 | parser->buffer[parser->idx++] = ch; | |
f4d0706c CD |
1438 | /* Make sure the parsed string always terminates with '\0'. */ |
1439 | parser->buffer[parser->idx] = 0; | |
057db848 SR |
1440 | } else { |
1441 | ret = -EINVAL; | |
1442 | goto out; | |
b63f39ea | 1443 | } |
1444 | ||
1445 | *ppos += read; | |
1446 | ret = read; | |
1447 | ||
1448 | out: | |
1449 | return ret; | |
1450 | } | |
1451 | ||
3a161d99 | 1452 | /* TODO add a seq_buf_to_buffer() */ |
b8b94265 | 1453 | static ssize_t trace_seq_to_buffer(struct trace_seq *s, void *buf, size_t cnt) |
3c56819b EGM |
1454 | { |
1455 | int len; | |
3c56819b | 1456 | |
5ac48378 | 1457 | if (trace_seq_used(s) <= s->seq.readpos) |
3c56819b EGM |
1458 | return -EBUSY; |
1459 | ||
5ac48378 | 1460 | len = trace_seq_used(s) - s->seq.readpos; |
3c56819b EGM |
1461 | if (cnt > len) |
1462 | cnt = len; | |
3a161d99 | 1463 | memcpy(buf, s->buffer + s->seq.readpos, cnt); |
3c56819b | 1464 | |
3a161d99 | 1465 | s->seq.readpos += cnt; |
3c56819b EGM |
1466 | return cnt; |
1467 | } | |
1468 | ||
0e950173 TB |
1469 | unsigned long __read_mostly tracing_thresh; |
1470 | ||
5d4a9dba | 1471 | #ifdef CONFIG_TRACER_MAX_TRACE |
5d4a9dba SR |
1472 | /* |
1473 | * Copy the new maximum trace into the separate maximum-trace | |
1474 | * structure. (this way the maximum trace is permanently saved, | |
5a93bae2 | 1475 | * for later retrieval via /sys/kernel/tracing/tracing_max_latency) |
5d4a9dba SR |
1476 | */ |
1477 | static void | |
1478 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) | |
1479 | { | |
12883efb SRRH |
1480 | struct trace_buffer *trace_buf = &tr->trace_buffer; |
1481 | struct trace_buffer *max_buf = &tr->max_buffer; | |
1482 | struct trace_array_cpu *data = per_cpu_ptr(trace_buf->data, cpu); | |
1483 | struct trace_array_cpu *max_data = per_cpu_ptr(max_buf->data, cpu); | |
5d4a9dba | 1484 | |
12883efb SRRH |
1485 | max_buf->cpu = cpu; |
1486 | max_buf->time_start = data->preempt_timestamp; | |
5d4a9dba | 1487 | |
6d9b3fa5 | 1488 | max_data->saved_latency = tr->max_latency; |
8248ac05 SR |
1489 | max_data->critical_start = data->critical_start; |
1490 | max_data->critical_end = data->critical_end; | |
5d4a9dba | 1491 | |
1acaa1b2 | 1492 | memcpy(max_data->comm, tsk->comm, TASK_COMM_LEN); |
8248ac05 | 1493 | max_data->pid = tsk->pid; |
f17a5194 SRRH |
1494 | /* |
1495 | * If tsk == current, then use current_uid(), as that does not use | |
1496 | * RCU. The irq tracer can be called out of RCU scope. | |
1497 | */ | |
1498 | if (tsk == current) | |
1499 | max_data->uid = current_uid(); | |
1500 | else | |
1501 | max_data->uid = task_uid(tsk); | |
1502 | ||
8248ac05 SR |
1503 | max_data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; |
1504 | max_data->policy = tsk->policy; | |
1505 | max_data->rt_priority = tsk->rt_priority; | |
5d4a9dba SR |
1506 | |
1507 | /* record this tasks comm */ | |
1508 | tracing_record_cmdline(tsk); | |
1509 | } | |
1510 | ||
4fcdae83 SR |
1511 | /** |
1512 | * update_max_tr - snapshot all trace buffers from global_trace to max_tr | |
1513 | * @tr: tracer | |
1514 | * @tsk: the task with the latency | |
1515 | * @cpu: The cpu that initiated the trace. | |
a35873a0 | 1516 | * @cond_data: User data associated with a conditional snapshot |
4fcdae83 SR |
1517 | * |
1518 | * Flip the buffers between the @tr and the max_tr and record information | |
1519 | * about which task was the cause of this latency. | |
1520 | */ | |
e309b41d | 1521 | void |
a35873a0 TZ |
1522 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu, |
1523 | void *cond_data) | |
bc0c38d1 | 1524 | { |
2b6080f2 | 1525 | if (tr->stop_count) |
b8de7bd1 SR |
1526 | return; |
1527 | ||
4c11d7ae | 1528 | WARN_ON_ONCE(!irqs_disabled()); |
34600f0e | 1529 | |
45ad21ca | 1530 | if (!tr->allocated_snapshot) { |
debdd57f | 1531 | /* Only the nop tracer should hit this when disabling */ |
2b6080f2 | 1532 | WARN_ON_ONCE(tr->current_trace != &nop_trace); |
34600f0e | 1533 | return; |
debdd57f | 1534 | } |
34600f0e | 1535 | |
0b9b12c1 | 1536 | arch_spin_lock(&tr->max_lock); |
3928a8a2 | 1537 | |
73c8d894 MH |
1538 | /* Inherit the recordable setting from trace_buffer */ |
1539 | if (ring_buffer_record_is_set_on(tr->trace_buffer.buffer)) | |
1540 | ring_buffer_record_on(tr->max_buffer.buffer); | |
1541 | else | |
1542 | ring_buffer_record_off(tr->max_buffer.buffer); | |
1543 | ||
a35873a0 TZ |
1544 | #ifdef CONFIG_TRACER_SNAPSHOT |
1545 | if (tr->cond_snapshot && !tr->cond_snapshot->update(tr, cond_data)) | |
1546 | goto out_unlock; | |
1547 | #endif | |
08ae88f8 | 1548 | swap(tr->trace_buffer.buffer, tr->max_buffer.buffer); |
3928a8a2 | 1549 | |
bc0c38d1 | 1550 | __update_max_tr(tr, tsk, cpu); |
a35873a0 TZ |
1551 | |
1552 | out_unlock: | |
0b9b12c1 | 1553 | arch_spin_unlock(&tr->max_lock); |
bc0c38d1 SR |
1554 | } |
1555 | ||
1556 | /** | |
1557 | * update_max_tr_single - only copy one trace over, and reset the rest | |
1558 | * @tr - tracer | |
1559 | * @tsk - task with the latency | |
1560 | * @cpu - the cpu of the buffer to copy. | |
4fcdae83 SR |
1561 | * |
1562 | * Flip the trace of a single CPU buffer between the @tr and the max_tr. | |
bc0c38d1 | 1563 | */ |
e309b41d | 1564 | void |
bc0c38d1 SR |
1565 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
1566 | { | |
3928a8a2 | 1567 | int ret; |
bc0c38d1 | 1568 | |
2b6080f2 | 1569 | if (tr->stop_count) |
b8de7bd1 SR |
1570 | return; |
1571 | ||
4c11d7ae | 1572 | WARN_ON_ONCE(!irqs_disabled()); |
6c24499f | 1573 | if (!tr->allocated_snapshot) { |
2930e04d | 1574 | /* Only the nop tracer should hit this when disabling */ |
9e8529af | 1575 | WARN_ON_ONCE(tr->current_trace != &nop_trace); |
ef710e10 | 1576 | return; |
2930e04d | 1577 | } |
ef710e10 | 1578 | |
0b9b12c1 | 1579 | arch_spin_lock(&tr->max_lock); |
bc0c38d1 | 1580 | |
12883efb | 1581 | ret = ring_buffer_swap_cpu(tr->max_buffer.buffer, tr->trace_buffer.buffer, cpu); |
3928a8a2 | 1582 | |
e8165dbb SR |
1583 | if (ret == -EBUSY) { |
1584 | /* | |
1585 | * We failed to swap the buffer due to a commit taking | |
1586 | * place on this CPU. We fail to record, but we reset | |
1587 | * the max trace buffer (no one writes directly to it) | |
1588 | * and flag that it failed. | |
1589 | */ | |
12883efb | 1590 | trace_array_printk_buf(tr->max_buffer.buffer, _THIS_IP_, |
e8165dbb SR |
1591 | "Failed to swap buffers due to commit in progress\n"); |
1592 | } | |
1593 | ||
e8165dbb | 1594 | WARN_ON_ONCE(ret && ret != -EAGAIN && ret != -EBUSY); |
bc0c38d1 SR |
1595 | |
1596 | __update_max_tr(tr, tsk, cpu); | |
0b9b12c1 | 1597 | arch_spin_unlock(&tr->max_lock); |
bc0c38d1 | 1598 | } |
5d4a9dba | 1599 | #endif /* CONFIG_TRACER_MAX_TRACE */ |
bc0c38d1 | 1600 | |
2c2b0a78 | 1601 | static int wait_on_pipe(struct trace_iterator *iter, int full) |
0d5c6e1c | 1602 | { |
15693458 SRRH |
1603 | /* Iterators are static, they should be filled or empty */ |
1604 | if (trace_buffer_iter(iter, iter->cpu_file)) | |
8b8b3683 | 1605 | return 0; |
0d5c6e1c | 1606 | |
e30f53aa RV |
1607 | return ring_buffer_wait(iter->trace_buffer->buffer, iter->cpu_file, |
1608 | full); | |
0d5c6e1c SR |
1609 | } |
1610 | ||
f4e781c0 | 1611 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
9afecfbb SRV |
1612 | static bool selftests_can_run; |
1613 | ||
1614 | struct trace_selftests { | |
1615 | struct list_head list; | |
1616 | struct tracer *type; | |
1617 | }; | |
1618 | ||
1619 | static LIST_HEAD(postponed_selftests); | |
1620 | ||
1621 | static int save_selftest(struct tracer *type) | |
1622 | { | |
1623 | struct trace_selftests *selftest; | |
1624 | ||
1625 | selftest = kmalloc(sizeof(*selftest), GFP_KERNEL); | |
1626 | if (!selftest) | |
1627 | return -ENOMEM; | |
1628 | ||
1629 | selftest->type = type; | |
1630 | list_add(&selftest->list, &postponed_selftests); | |
1631 | return 0; | |
1632 | } | |
1633 | ||
f4e781c0 SRRH |
1634 | static int run_tracer_selftest(struct tracer *type) |
1635 | { | |
1636 | struct trace_array *tr = &global_trace; | |
1637 | struct tracer *saved_tracer = tr->current_trace; | |
1638 | int ret; | |
0d5c6e1c | 1639 | |
f4e781c0 SRRH |
1640 | if (!type->selftest || tracing_selftest_disabled) |
1641 | return 0; | |
0d5c6e1c | 1642 | |
9afecfbb SRV |
1643 | /* |
1644 | * If a tracer registers early in boot up (before scheduling is | |
1645 | * initialized and such), then do not run its selftests yet. | |
1646 | * Instead, run it a little later in the boot process. | |
1647 | */ | |
1648 | if (!selftests_can_run) | |
1649 | return save_selftest(type); | |
1650 | ||
0d5c6e1c | 1651 | /* |
f4e781c0 SRRH |
1652 | * Run a selftest on this tracer. |
1653 | * Here we reset the trace buffer, and set the current | |
1654 | * tracer to be this tracer. The tracer can then run some | |
1655 | * internal tracing to verify that everything is in order. | |
1656 | * If we fail, we do not register this tracer. | |
0d5c6e1c | 1657 | */ |
f4e781c0 | 1658 | tracing_reset_online_cpus(&tr->trace_buffer); |
0d5c6e1c | 1659 | |
f4e781c0 SRRH |
1660 | tr->current_trace = type; |
1661 | ||
1662 | #ifdef CONFIG_TRACER_MAX_TRACE | |
1663 | if (type->use_max_tr) { | |
1664 | /* If we expanded the buffers, make sure the max is expanded too */ | |
1665 | if (ring_buffer_expanded) | |
1666 | ring_buffer_resize(tr->max_buffer.buffer, trace_buf_size, | |
1667 | RING_BUFFER_ALL_CPUS); | |
1668 | tr->allocated_snapshot = true; | |
1669 | } | |
1670 | #endif | |
1671 | ||
1672 | /* the test is responsible for initializing and enabling */ | |
1673 | pr_info("Testing tracer %s: ", type->name); | |
1674 | ret = type->selftest(type, tr); | |
1675 | /* the test is responsible for resetting too */ | |
1676 | tr->current_trace = saved_tracer; | |
1677 | if (ret) { | |
1678 | printk(KERN_CONT "FAILED!\n"); | |
1679 | /* Add the warning after printing 'FAILED' */ | |
1680 | WARN_ON(1); | |
1681 | return -1; | |
1682 | } | |
1683 | /* Only reset on passing, to avoid touching corrupted buffers */ | |
1684 | tracing_reset_online_cpus(&tr->trace_buffer); | |
1685 | ||
1686 | #ifdef CONFIG_TRACER_MAX_TRACE | |
1687 | if (type->use_max_tr) { | |
1688 | tr->allocated_snapshot = false; | |
0d5c6e1c | 1689 | |
f4e781c0 SRRH |
1690 | /* Shrink the max buffer again */ |
1691 | if (ring_buffer_expanded) | |
1692 | ring_buffer_resize(tr->max_buffer.buffer, 1, | |
1693 | RING_BUFFER_ALL_CPUS); | |
1694 | } | |
1695 | #endif | |
1696 | ||
1697 | printk(KERN_CONT "PASSED\n"); | |
1698 | return 0; | |
1699 | } | |
9afecfbb SRV |
1700 | |
1701 | static __init int init_trace_selftests(void) | |
1702 | { | |
1703 | struct trace_selftests *p, *n; | |
1704 | struct tracer *t, **last; | |
1705 | int ret; | |
1706 | ||
1707 | selftests_can_run = true; | |
1708 | ||
1709 | mutex_lock(&trace_types_lock); | |
1710 | ||
1711 | if (list_empty(&postponed_selftests)) | |
1712 | goto out; | |
1713 | ||
1714 | pr_info("Running postponed tracer tests:\n"); | |
1715 | ||
1716 | list_for_each_entry_safe(p, n, &postponed_selftests, list) { | |
1717 | ret = run_tracer_selftest(p->type); | |
1718 | /* If the test fails, then warn and remove from available_tracers */ | |
1719 | if (ret < 0) { | |
1720 | WARN(1, "tracer: %s failed selftest, disabling\n", | |
1721 | p->type->name); | |
1722 | last = &trace_types; | |
1723 | for (t = trace_types; t; t = t->next) { | |
1724 | if (t == p->type) { | |
1725 | *last = t->next; | |
1726 | break; | |
1727 | } | |
1728 | last = &t->next; | |
1729 | } | |
1730 | } | |
1731 | list_del(&p->list); | |
1732 | kfree(p); | |
1733 | } | |
1734 | ||
1735 | out: | |
1736 | mutex_unlock(&trace_types_lock); | |
1737 | ||
1738 | return 0; | |
1739 | } | |
b9ef0326 | 1740 | core_initcall(init_trace_selftests); |
f4e781c0 SRRH |
1741 | #else |
1742 | static inline int run_tracer_selftest(struct tracer *type) | |
1743 | { | |
1744 | return 0; | |
0d5c6e1c | 1745 | } |
f4e781c0 | 1746 | #endif /* CONFIG_FTRACE_STARTUP_TEST */ |
0d5c6e1c | 1747 | |
41d9c0be SRRH |
1748 | static void add_tracer_options(struct trace_array *tr, struct tracer *t); |
1749 | ||
a4d1e688 JW |
1750 | static void __init apply_trace_boot_options(void); |
1751 | ||
4fcdae83 SR |
1752 | /** |
1753 | * register_tracer - register a tracer with the ftrace system. | |
1754 | * @type - the plugin for the tracer | |
1755 | * | |
1756 | * Register a new plugin tracer. | |
1757 | */ | |
a4d1e688 | 1758 | int __init register_tracer(struct tracer *type) |
bc0c38d1 SR |
1759 | { |
1760 | struct tracer *t; | |
bc0c38d1 SR |
1761 | int ret = 0; |
1762 | ||
1763 | if (!type->name) { | |
1764 | pr_info("Tracer must have a name\n"); | |
1765 | return -1; | |
1766 | } | |
1767 | ||
24a461d5 | 1768 | if (strlen(type->name) >= MAX_TRACER_SIZE) { |
ee6c2c1b LZ |
1769 | pr_info("Tracer has a name longer than %d\n", MAX_TRACER_SIZE); |
1770 | return -1; | |
1771 | } | |
1772 | ||
bc0c38d1 | 1773 | mutex_lock(&trace_types_lock); |
86fa2f60 | 1774 | |
8e1b82e0 FW |
1775 | tracing_selftest_running = true; |
1776 | ||
bc0c38d1 SR |
1777 | for (t = trace_types; t; t = t->next) { |
1778 | if (strcmp(type->name, t->name) == 0) { | |
1779 | /* already found */ | |
ee6c2c1b | 1780 | pr_info("Tracer %s already registered\n", |
bc0c38d1 SR |
1781 | type->name); |
1782 | ret = -1; | |
1783 | goto out; | |
1784 | } | |
1785 | } | |
1786 | ||
adf9f195 FW |
1787 | if (!type->set_flag) |
1788 | type->set_flag = &dummy_set_flag; | |
d39cdd20 CH |
1789 | if (!type->flags) { |
1790 | /*allocate a dummy tracer_flags*/ | |
1791 | type->flags = kmalloc(sizeof(*type->flags), GFP_KERNEL); | |
c8ca003b CH |
1792 | if (!type->flags) { |
1793 | ret = -ENOMEM; | |
1794 | goto out; | |
1795 | } | |
d39cdd20 CH |
1796 | type->flags->val = 0; |
1797 | type->flags->opts = dummy_tracer_opt; | |
1798 | } else | |
adf9f195 FW |
1799 | if (!type->flags->opts) |
1800 | type->flags->opts = dummy_tracer_opt; | |
6eaaa5d5 | 1801 | |
d39cdd20 CH |
1802 | /* store the tracer for __set_tracer_option */ |
1803 | type->flags->trace = type; | |
1804 | ||
f4e781c0 SRRH |
1805 | ret = run_tracer_selftest(type); |
1806 | if (ret < 0) | |
1807 | goto out; | |
60a11774 | 1808 | |
bc0c38d1 SR |
1809 | type->next = trace_types; |
1810 | trace_types = type; | |
41d9c0be | 1811 | add_tracer_options(&global_trace, type); |
60a11774 | 1812 | |
bc0c38d1 | 1813 | out: |
8e1b82e0 | 1814 | tracing_selftest_running = false; |
bc0c38d1 SR |
1815 | mutex_unlock(&trace_types_lock); |
1816 | ||
dac74940 SR |
1817 | if (ret || !default_bootup_tracer) |
1818 | goto out_unlock; | |
1819 | ||
ee6c2c1b | 1820 | if (strncmp(default_bootup_tracer, type->name, MAX_TRACER_SIZE)) |
dac74940 SR |
1821 | goto out_unlock; |
1822 | ||
1823 | printk(KERN_INFO "Starting tracer '%s'\n", type->name); | |
1824 | /* Do we want this tracer to start on bootup? */ | |
607e2ea1 | 1825 | tracing_set_tracer(&global_trace, type->name); |
dac74940 | 1826 | default_bootup_tracer = NULL; |
a4d1e688 JW |
1827 | |
1828 | apply_trace_boot_options(); | |
1829 | ||
dac74940 | 1830 | /* disable other selftests, since this will break it. */ |
55034cd6 | 1831 | tracing_selftest_disabled = true; |
b2821ae6 | 1832 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
dac74940 SR |
1833 | printk(KERN_INFO "Disabling FTRACE selftests due to running tracer '%s'\n", |
1834 | type->name); | |
b2821ae6 | 1835 | #endif |
b2821ae6 | 1836 | |
dac74940 | 1837 | out_unlock: |
bc0c38d1 SR |
1838 | return ret; |
1839 | } | |
1840 | ||
12883efb | 1841 | void tracing_reset(struct trace_buffer *buf, int cpu) |
f633903a | 1842 | { |
12883efb | 1843 | struct ring_buffer *buffer = buf->buffer; |
f633903a | 1844 | |
a5416411 HT |
1845 | if (!buffer) |
1846 | return; | |
1847 | ||
f633903a SR |
1848 | ring_buffer_record_disable(buffer); |
1849 | ||
1850 | /* Make sure all commits have finished */ | |
74401729 | 1851 | synchronize_rcu(); |
68179686 | 1852 | ring_buffer_reset_cpu(buffer, cpu); |
f633903a SR |
1853 | |
1854 | ring_buffer_record_enable(buffer); | |
1855 | } | |
1856 | ||
12883efb | 1857 | void tracing_reset_online_cpus(struct trace_buffer *buf) |
213cc060 | 1858 | { |
12883efb | 1859 | struct ring_buffer *buffer = buf->buffer; |
213cc060 PE |
1860 | int cpu; |
1861 | ||
a5416411 HT |
1862 | if (!buffer) |
1863 | return; | |
1864 | ||
621968cd SR |
1865 | ring_buffer_record_disable(buffer); |
1866 | ||
1867 | /* Make sure all commits have finished */ | |
74401729 | 1868 | synchronize_rcu(); |
621968cd | 1869 | |
9457158b | 1870 | buf->time_start = buffer_ftrace_now(buf, buf->cpu); |
213cc060 PE |
1871 | |
1872 | for_each_online_cpu(cpu) | |
68179686 | 1873 | ring_buffer_reset_cpu(buffer, cpu); |
621968cd SR |
1874 | |
1875 | ring_buffer_record_enable(buffer); | |
213cc060 PE |
1876 | } |
1877 | ||
09d8091c | 1878 | /* Must have trace_types_lock held */ |
873c642f | 1879 | void tracing_reset_all_online_cpus(void) |
9456f0fa | 1880 | { |
873c642f SRRH |
1881 | struct trace_array *tr; |
1882 | ||
873c642f | 1883 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
065e63f9 SRV |
1884 | if (!tr->clear_trace) |
1885 | continue; | |
1886 | tr->clear_trace = false; | |
12883efb SRRH |
1887 | tracing_reset_online_cpus(&tr->trace_buffer); |
1888 | #ifdef CONFIG_TRACER_MAX_TRACE | |
1889 | tracing_reset_online_cpus(&tr->max_buffer); | |
1890 | #endif | |
873c642f | 1891 | } |
9456f0fa SR |
1892 | } |
1893 | ||
d914ba37 JF |
1894 | static int *tgid_map; |
1895 | ||
939c7a4f | 1896 | #define SAVED_CMDLINES_DEFAULT 128 |
2c7eea4c | 1897 | #define NO_CMDLINE_MAP UINT_MAX |
edc35bd7 | 1898 | static arch_spinlock_t trace_cmdline_lock = __ARCH_SPIN_LOCK_UNLOCKED; |
939c7a4f YY |
1899 | struct saved_cmdlines_buffer { |
1900 | unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; | |
1901 | unsigned *map_cmdline_to_pid; | |
1902 | unsigned cmdline_num; | |
1903 | int cmdline_idx; | |
1904 | char *saved_cmdlines; | |
1905 | }; | |
1906 | static struct saved_cmdlines_buffer *savedcmd; | |
25b0b44a | 1907 | |
25b0b44a | 1908 | /* temporary disable recording */ |
d914ba37 | 1909 | static atomic_t trace_record_taskinfo_disabled __read_mostly; |
bc0c38d1 | 1910 | |
939c7a4f YY |
1911 | static inline char *get_saved_cmdlines(int idx) |
1912 | { | |
1913 | return &savedcmd->saved_cmdlines[idx * TASK_COMM_LEN]; | |
1914 | } | |
1915 | ||
1916 | static inline void set_cmdline(int idx, const char *cmdline) | |
bc0c38d1 | 1917 | { |
939c7a4f YY |
1918 | memcpy(get_saved_cmdlines(idx), cmdline, TASK_COMM_LEN); |
1919 | } | |
1920 | ||
1921 | static int allocate_cmdlines_buffer(unsigned int val, | |
1922 | struct saved_cmdlines_buffer *s) | |
1923 | { | |
6da2ec56 KC |
1924 | s->map_cmdline_to_pid = kmalloc_array(val, |
1925 | sizeof(*s->map_cmdline_to_pid), | |
1926 | GFP_KERNEL); | |
939c7a4f YY |
1927 | if (!s->map_cmdline_to_pid) |
1928 | return -ENOMEM; | |
1929 | ||
6da2ec56 | 1930 | s->saved_cmdlines = kmalloc_array(TASK_COMM_LEN, val, GFP_KERNEL); |
939c7a4f YY |
1931 | if (!s->saved_cmdlines) { |
1932 | kfree(s->map_cmdline_to_pid); | |
1933 | return -ENOMEM; | |
1934 | } | |
1935 | ||
1936 | s->cmdline_idx = 0; | |
1937 | s->cmdline_num = val; | |
1938 | memset(&s->map_pid_to_cmdline, NO_CMDLINE_MAP, | |
1939 | sizeof(s->map_pid_to_cmdline)); | |
1940 | memset(s->map_cmdline_to_pid, NO_CMDLINE_MAP, | |
1941 | val * sizeof(*s->map_cmdline_to_pid)); | |
1942 | ||
1943 | return 0; | |
1944 | } | |
1945 | ||
1946 | static int trace_create_savedcmd(void) | |
1947 | { | |
1948 | int ret; | |
1949 | ||
a6af8fbf | 1950 | savedcmd = kmalloc(sizeof(*savedcmd), GFP_KERNEL); |
939c7a4f YY |
1951 | if (!savedcmd) |
1952 | return -ENOMEM; | |
1953 | ||
1954 | ret = allocate_cmdlines_buffer(SAVED_CMDLINES_DEFAULT, savedcmd); | |
1955 | if (ret < 0) { | |
1956 | kfree(savedcmd); | |
1957 | savedcmd = NULL; | |
1958 | return -ENOMEM; | |
1959 | } | |
1960 | ||
1961 | return 0; | |
bc0c38d1 SR |
1962 | } |
1963 | ||
b5130b1e CE |
1964 | int is_tracing_stopped(void) |
1965 | { | |
2b6080f2 | 1966 | return global_trace.stop_count; |
b5130b1e CE |
1967 | } |
1968 | ||
0f048701 SR |
1969 | /** |
1970 | * tracing_start - quick start of the tracer | |
1971 | * | |
1972 | * If tracing is enabled but was stopped by tracing_stop, | |
1973 | * this will start the tracer back up. | |
1974 | */ | |
1975 | void tracing_start(void) | |
1976 | { | |
1977 | struct ring_buffer *buffer; | |
1978 | unsigned long flags; | |
1979 | ||
1980 | if (tracing_disabled) | |
1981 | return; | |
1982 | ||
2b6080f2 SR |
1983 | raw_spin_lock_irqsave(&global_trace.start_lock, flags); |
1984 | if (--global_trace.stop_count) { | |
1985 | if (global_trace.stop_count < 0) { | |
b06a8301 SR |
1986 | /* Someone screwed up their debugging */ |
1987 | WARN_ON_ONCE(1); | |
2b6080f2 | 1988 | global_trace.stop_count = 0; |
b06a8301 | 1989 | } |
0f048701 SR |
1990 | goto out; |
1991 | } | |
1992 | ||
a2f80714 | 1993 | /* Prevent the buffers from switching */ |
0b9b12c1 | 1994 | arch_spin_lock(&global_trace.max_lock); |
0f048701 | 1995 | |
12883efb | 1996 | buffer = global_trace.trace_buffer.buffer; |
0f048701 SR |
1997 | if (buffer) |
1998 | ring_buffer_record_enable(buffer); | |
1999 | ||
12883efb SRRH |
2000 | #ifdef CONFIG_TRACER_MAX_TRACE |
2001 | buffer = global_trace.max_buffer.buffer; | |
0f048701 SR |
2002 | if (buffer) |
2003 | ring_buffer_record_enable(buffer); | |
12883efb | 2004 | #endif |
0f048701 | 2005 | |
0b9b12c1 | 2006 | arch_spin_unlock(&global_trace.max_lock); |
a2f80714 | 2007 | |
0f048701 | 2008 | out: |
2b6080f2 SR |
2009 | raw_spin_unlock_irqrestore(&global_trace.start_lock, flags); |
2010 | } | |
2011 | ||
2012 | static void tracing_start_tr(struct trace_array *tr) | |
2013 | { | |
2014 | struct ring_buffer *buffer; | |
2015 | unsigned long flags; | |
2016 | ||
2017 | if (tracing_disabled) | |
2018 | return; | |
2019 | ||
2020 | /* If global, we need to also start the max tracer */ | |
2021 | if (tr->flags & TRACE_ARRAY_FL_GLOBAL) | |
2022 | return tracing_start(); | |
2023 | ||
2024 | raw_spin_lock_irqsave(&tr->start_lock, flags); | |
2025 | ||
2026 | if (--tr->stop_count) { | |
2027 | if (tr->stop_count < 0) { | |
2028 | /* Someone screwed up their debugging */ | |
2029 | WARN_ON_ONCE(1); | |
2030 | tr->stop_count = 0; | |
2031 | } | |
2032 | goto out; | |
2033 | } | |
2034 | ||
12883efb | 2035 | buffer = tr->trace_buffer.buffer; |
2b6080f2 SR |
2036 | if (buffer) |
2037 | ring_buffer_record_enable(buffer); | |
2038 | ||
2039 | out: | |
2040 | raw_spin_unlock_irqrestore(&tr->start_lock, flags); | |
0f048701 SR |
2041 | } |
2042 | ||
2043 | /** | |
2044 | * tracing_stop - quick stop of the tracer | |
2045 | * | |
2046 | * Light weight way to stop tracing. Use in conjunction with | |
2047 | * tracing_start. | |
2048 | */ | |
2049 | void tracing_stop(void) | |
2050 | { | |
2051 | struct ring_buffer *buffer; | |
2052 | unsigned long flags; | |
2053 | ||
2b6080f2 SR |
2054 | raw_spin_lock_irqsave(&global_trace.start_lock, flags); |
2055 | if (global_trace.stop_count++) | |
0f048701 SR |
2056 | goto out; |
2057 | ||
a2f80714 | 2058 | /* Prevent the buffers from switching */ |
0b9b12c1 | 2059 | arch_spin_lock(&global_trace.max_lock); |
a2f80714 | 2060 | |
12883efb | 2061 | buffer = global_trace.trace_buffer.buffer; |
0f048701 SR |
2062 | if (buffer) |
2063 | ring_buffer_record_disable(buffer); | |
2064 | ||
12883efb SRRH |
2065 | #ifdef CONFIG_TRACER_MAX_TRACE |
2066 | buffer = global_trace.max_buffer.buffer; | |
0f048701 SR |
2067 | if (buffer) |
2068 | ring_buffer_record_disable(buffer); | |
12883efb | 2069 | #endif |
0f048701 | 2070 | |
0b9b12c1 | 2071 | arch_spin_unlock(&global_trace.max_lock); |
a2f80714 | 2072 | |
0f048701 | 2073 | out: |
2b6080f2 SR |
2074 | raw_spin_unlock_irqrestore(&global_trace.start_lock, flags); |
2075 | } | |
2076 | ||
2077 | static void tracing_stop_tr(struct trace_array *tr) | |
2078 | { | |
2079 | struct ring_buffer *buffer; | |
2080 | unsigned long flags; | |
2081 | ||
2082 | /* If global, we need to also stop the max tracer */ | |
2083 | if (tr->flags & TRACE_ARRAY_FL_GLOBAL) | |
2084 | return tracing_stop(); | |
2085 | ||
2086 | raw_spin_lock_irqsave(&tr->start_lock, flags); | |
2087 | if (tr->stop_count++) | |
2088 | goto out; | |
2089 | ||
12883efb | 2090 | buffer = tr->trace_buffer.buffer; |
2b6080f2 SR |
2091 | if (buffer) |
2092 | ring_buffer_record_disable(buffer); | |
2093 | ||
2094 | out: | |
2095 | raw_spin_unlock_irqrestore(&tr->start_lock, flags); | |
0f048701 SR |
2096 | } |
2097 | ||
379cfdac | 2098 | static int trace_save_cmdline(struct task_struct *tsk) |
bc0c38d1 | 2099 | { |
a635cf04 | 2100 | unsigned pid, idx; |
bc0c38d1 | 2101 | |
eaf260ac JF |
2102 | /* treat recording of idle task as a success */ |
2103 | if (!tsk->pid) | |
2104 | return 1; | |
2105 | ||
2106 | if (unlikely(tsk->pid > PID_MAX_DEFAULT)) | |
379cfdac | 2107 | return 0; |
bc0c38d1 SR |
2108 | |
2109 | /* | |
2110 | * It's not the end of the world if we don't get | |
2111 | * the lock, but we also don't want to spin | |
2112 | * nor do we want to disable interrupts, | |
2113 | * so if we miss here, then better luck next time. | |
2114 | */ | |
0199c4e6 | 2115 | if (!arch_spin_trylock(&trace_cmdline_lock)) |
379cfdac | 2116 | return 0; |
bc0c38d1 | 2117 | |
939c7a4f | 2118 | idx = savedcmd->map_pid_to_cmdline[tsk->pid]; |
2c7eea4c | 2119 | if (idx == NO_CMDLINE_MAP) { |
939c7a4f | 2120 | idx = (savedcmd->cmdline_idx + 1) % savedcmd->cmdline_num; |
bc0c38d1 | 2121 | |
a635cf04 CE |
2122 | /* |
2123 | * Check whether the cmdline buffer at idx has a pid | |
2124 | * mapped. We are going to overwrite that entry so we | |
2125 | * need to clear the map_pid_to_cmdline. Otherwise we | |
2126 | * would read the new comm for the old pid. | |
2127 | */ | |
939c7a4f | 2128 | pid = savedcmd->map_cmdline_to_pid[idx]; |
a635cf04 | 2129 | if (pid != NO_CMDLINE_MAP) |
939c7a4f | 2130 | savedcmd->map_pid_to_cmdline[pid] = NO_CMDLINE_MAP; |
bc0c38d1 | 2131 | |
939c7a4f YY |
2132 | savedcmd->map_cmdline_to_pid[idx] = tsk->pid; |
2133 | savedcmd->map_pid_to_cmdline[tsk->pid] = idx; | |
bc0c38d1 | 2134 | |
939c7a4f | 2135 | savedcmd->cmdline_idx = idx; |
bc0c38d1 SR |
2136 | } |
2137 | ||
939c7a4f | 2138 | set_cmdline(idx, tsk->comm); |
bc0c38d1 | 2139 | |
0199c4e6 | 2140 | arch_spin_unlock(&trace_cmdline_lock); |
379cfdac SRRH |
2141 | |
2142 | return 1; | |
bc0c38d1 SR |
2143 | } |
2144 | ||
4c27e756 | 2145 | static void __trace_find_cmdline(int pid, char comm[]) |
bc0c38d1 | 2146 | { |
bc0c38d1 SR |
2147 | unsigned map; |
2148 | ||
4ca53085 SR |
2149 | if (!pid) { |
2150 | strcpy(comm, "<idle>"); | |
2151 | return; | |
2152 | } | |
bc0c38d1 | 2153 | |
74bf4076 SR |
2154 | if (WARN_ON_ONCE(pid < 0)) { |
2155 | strcpy(comm, "<XXX>"); | |
2156 | return; | |
2157 | } | |
2158 | ||
4ca53085 SR |
2159 | if (pid > PID_MAX_DEFAULT) { |
2160 | strcpy(comm, "<...>"); | |
2161 | return; | |
2162 | } | |
bc0c38d1 | 2163 | |
939c7a4f | 2164 | map = savedcmd->map_pid_to_cmdline[pid]; |
50d88758 | 2165 | if (map != NO_CMDLINE_MAP) |
e09e2867 | 2166 | strlcpy(comm, get_saved_cmdlines(map), TASK_COMM_LEN); |
50d88758 TG |
2167 | else |
2168 | strcpy(comm, "<...>"); | |
4c27e756 SRRH |
2169 | } |
2170 | ||
2171 | void trace_find_cmdline(int pid, char comm[]) | |
2172 | { | |
2173 | preempt_disable(); | |
2174 | arch_spin_lock(&trace_cmdline_lock); | |
2175 | ||
2176 | __trace_find_cmdline(pid, comm); | |
bc0c38d1 | 2177 | |
0199c4e6 | 2178 | arch_spin_unlock(&trace_cmdline_lock); |
5b6045a9 | 2179 | preempt_enable(); |
bc0c38d1 SR |
2180 | } |
2181 | ||
d914ba37 JF |
2182 | int trace_find_tgid(int pid) |
2183 | { | |
2184 | if (unlikely(!tgid_map || !pid || pid > PID_MAX_DEFAULT)) | |
2185 | return 0; | |
2186 | ||
2187 | return tgid_map[pid]; | |
2188 | } | |
2189 | ||
2190 | static int trace_save_tgid(struct task_struct *tsk) | |
2191 | { | |
bd45d34d JF |
2192 | /* treat recording of idle task as a success */ |
2193 | if (!tsk->pid) | |
2194 | return 1; | |
2195 | ||
2196 | if (unlikely(!tgid_map || tsk->pid > PID_MAX_DEFAULT)) | |
d914ba37 JF |
2197 | return 0; |
2198 | ||
2199 | tgid_map[tsk->pid] = tsk->tgid; | |
2200 | return 1; | |
2201 | } | |
2202 | ||
2203 | static bool tracing_record_taskinfo_skip(int flags) | |
2204 | { | |
2205 | if (unlikely(!(flags & (TRACE_RECORD_CMDLINE | TRACE_RECORD_TGID)))) | |
2206 | return true; | |
2207 | if (atomic_read(&trace_record_taskinfo_disabled) || !tracing_is_on()) | |
2208 | return true; | |
2209 | if (!__this_cpu_read(trace_taskinfo_save)) | |
2210 | return true; | |
2211 | return false; | |
2212 | } | |
2213 | ||
2214 | /** | |
2215 | * tracing_record_taskinfo - record the task info of a task | |
2216 | * | |
2217 | * @task - task to record | |
2218 | * @flags - TRACE_RECORD_CMDLINE for recording comm | |
2219 | * - TRACE_RECORD_TGID for recording tgid | |
2220 | */ | |
2221 | void tracing_record_taskinfo(struct task_struct *task, int flags) | |
2222 | { | |
29b1a8ad JF |
2223 | bool done; |
2224 | ||
d914ba37 JF |
2225 | if (tracing_record_taskinfo_skip(flags)) |
2226 | return; | |
29b1a8ad JF |
2227 | |
2228 | /* | |
2229 | * Record as much task information as possible. If some fail, continue | |
2230 | * to try to record the others. | |
2231 | */ | |
2232 | done = !(flags & TRACE_RECORD_CMDLINE) || trace_save_cmdline(task); | |
2233 | done &= !(flags & TRACE_RECORD_TGID) || trace_save_tgid(task); | |
2234 | ||
2235 | /* If recording any information failed, retry again soon. */ | |
2236 | if (!done) | |
d914ba37 JF |
2237 | return; |
2238 | ||
2239 | __this_cpu_write(trace_taskinfo_save, false); | |
2240 | } | |
2241 | ||
2242 | /** | |
2243 | * tracing_record_taskinfo_sched_switch - record task info for sched_switch | |
2244 | * | |
2245 | * @prev - previous task during sched_switch | |
2246 | * @next - next task during sched_switch | |
2247 | * @flags - TRACE_RECORD_CMDLINE for recording comm | |
2248 | * TRACE_RECORD_TGID for recording tgid | |
2249 | */ | |
2250 | void tracing_record_taskinfo_sched_switch(struct task_struct *prev, | |
2251 | struct task_struct *next, int flags) | |
bc0c38d1 | 2252 | { |
29b1a8ad JF |
2253 | bool done; |
2254 | ||
d914ba37 JF |
2255 | if (tracing_record_taskinfo_skip(flags)) |
2256 | return; | |
2257 | ||
29b1a8ad JF |
2258 | /* |
2259 | * Record as much task information as possible. If some fail, continue | |
2260 | * to try to record the others. | |
2261 | */ | |
2262 | done = !(flags & TRACE_RECORD_CMDLINE) || trace_save_cmdline(prev); | |
2263 | done &= !(flags & TRACE_RECORD_CMDLINE) || trace_save_cmdline(next); | |
2264 | done &= !(flags & TRACE_RECORD_TGID) || trace_save_tgid(prev); | |
2265 | done &= !(flags & TRACE_RECORD_TGID) || trace_save_tgid(next); | |
bc0c38d1 | 2266 | |
29b1a8ad JF |
2267 | /* If recording any information failed, retry again soon. */ |
2268 | if (!done) | |
7ffbd48d SR |
2269 | return; |
2270 | ||
d914ba37 JF |
2271 | __this_cpu_write(trace_taskinfo_save, false); |
2272 | } | |
2273 | ||
2274 | /* Helpers to record a specific task information */ | |
2275 | void tracing_record_cmdline(struct task_struct *task) | |
2276 | { | |
2277 | tracing_record_taskinfo(task, TRACE_RECORD_CMDLINE); | |
2278 | } | |
2279 | ||
2280 | void tracing_record_tgid(struct task_struct *task) | |
2281 | { | |
2282 | tracing_record_taskinfo(task, TRACE_RECORD_TGID); | |
bc0c38d1 SR |
2283 | } |
2284 | ||
af0009fc SRV |
2285 | /* |
2286 | * Several functions return TRACE_TYPE_PARTIAL_LINE if the trace_seq | |
2287 | * overflowed, and TRACE_TYPE_HANDLED otherwise. This helper function | |
2288 | * simplifies those functions and keeps them in sync. | |
2289 | */ | |
2290 | enum print_line_t trace_handle_return(struct trace_seq *s) | |
2291 | { | |
2292 | return trace_seq_has_overflowed(s) ? | |
2293 | TRACE_TYPE_PARTIAL_LINE : TRACE_TYPE_HANDLED; | |
2294 | } | |
2295 | EXPORT_SYMBOL_GPL(trace_handle_return); | |
2296 | ||
45dcd8b8 | 2297 | void |
38697053 SR |
2298 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags, |
2299 | int pc) | |
bc0c38d1 SR |
2300 | { |
2301 | struct task_struct *tsk = current; | |
bc0c38d1 | 2302 | |
777e208d SR |
2303 | entry->preempt_count = pc & 0xff; |
2304 | entry->pid = (tsk) ? tsk->pid : 0; | |
2305 | entry->flags = | |
9244489a | 2306 | #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT |
2e2ca155 | 2307 | (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
9244489a SR |
2308 | #else |
2309 | TRACE_FLAG_IRQS_NOSUPPORT | | |
2310 | #endif | |
7e6867bf | 2311 | ((pc & NMI_MASK ) ? TRACE_FLAG_NMI : 0) | |
bc0c38d1 | 2312 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
c59f29cb | 2313 | ((pc & SOFTIRQ_OFFSET) ? TRACE_FLAG_SOFTIRQ : 0) | |
e5137b50 PZ |
2314 | (tif_need_resched() ? TRACE_FLAG_NEED_RESCHED : 0) | |
2315 | (test_preempt_need_resched() ? TRACE_FLAG_PREEMPT_RESCHED : 0); | |
bc0c38d1 | 2316 | } |
f413cdb8 | 2317 | EXPORT_SYMBOL_GPL(tracing_generic_entry_update); |
bc0c38d1 | 2318 | |
e77405ad SR |
2319 | struct ring_buffer_event * |
2320 | trace_buffer_lock_reserve(struct ring_buffer *buffer, | |
2321 | int type, | |
2322 | unsigned long len, | |
2323 | unsigned long flags, int pc) | |
51a763dd | 2324 | { |
3e9a8aad | 2325 | return __trace_buffer_lock_reserve(buffer, type, len, flags, pc); |
0fc1b09f SRRH |
2326 | } |
2327 | ||
2328 | DEFINE_PER_CPU(struct ring_buffer_event *, trace_buffered_event); | |
2329 | DEFINE_PER_CPU(int, trace_buffered_event_cnt); | |
2330 | static int trace_buffered_event_ref; | |
2331 | ||
2332 | /** | |
2333 | * trace_buffered_event_enable - enable buffering events | |
2334 | * | |
2335 | * When events are being filtered, it is quicker to use a temporary | |
2336 | * buffer to write the event data into if there's a likely chance | |
2337 | * that it will not be committed. The discard of the ring buffer | |
2338 | * is not as fast as committing, and is much slower than copying | |
2339 | * a commit. | |
2340 | * | |
2341 | * When an event is to be filtered, allocate per cpu buffers to | |
2342 | * write the event data into, and if the event is filtered and discarded | |
2343 | * it is simply dropped, otherwise, the entire data is to be committed | |
2344 | * in one shot. | |
2345 | */ | |
2346 | void trace_buffered_event_enable(void) | |
2347 | { | |
2348 | struct ring_buffer_event *event; | |
2349 | struct page *page; | |
2350 | int cpu; | |
51a763dd | 2351 | |
0fc1b09f SRRH |
2352 | WARN_ON_ONCE(!mutex_is_locked(&event_mutex)); |
2353 | ||
2354 | if (trace_buffered_event_ref++) | |
2355 | return; | |
2356 | ||
2357 | for_each_tracing_cpu(cpu) { | |
2358 | page = alloc_pages_node(cpu_to_node(cpu), | |
2359 | GFP_KERNEL | __GFP_NORETRY, 0); | |
2360 | if (!page) | |
2361 | goto failed; | |
2362 | ||
2363 | event = page_address(page); | |
2364 | memset(event, 0, sizeof(*event)); | |
2365 | ||
2366 | per_cpu(trace_buffered_event, cpu) = event; | |
2367 | ||
2368 | preempt_disable(); | |
2369 | if (cpu == smp_processor_id() && | |
2370 | this_cpu_read(trace_buffered_event) != | |
2371 | per_cpu(trace_buffered_event, cpu)) | |
2372 | WARN_ON_ONCE(1); | |
2373 | preempt_enable(); | |
51a763dd ACM |
2374 | } |
2375 | ||
0fc1b09f SRRH |
2376 | return; |
2377 | failed: | |
2378 | trace_buffered_event_disable(); | |
2379 | } | |
2380 | ||
2381 | static void enable_trace_buffered_event(void *data) | |
2382 | { | |
2383 | /* Probably not needed, but do it anyway */ | |
2384 | smp_rmb(); | |
2385 | this_cpu_dec(trace_buffered_event_cnt); | |
2386 | } | |
2387 | ||
2388 | static void disable_trace_buffered_event(void *data) | |
2389 | { | |
2390 | this_cpu_inc(trace_buffered_event_cnt); | |
2391 | } | |
2392 | ||
2393 | /** | |
2394 | * trace_buffered_event_disable - disable buffering events | |
2395 | * | |
2396 | * When a filter is removed, it is faster to not use the buffered | |
2397 | * events, and to commit directly into the ring buffer. Free up | |
2398 | * the temp buffers when there are no more users. This requires | |
2399 | * special synchronization with current events. | |
2400 | */ | |
2401 | void trace_buffered_event_disable(void) | |
2402 | { | |
2403 | int cpu; | |
2404 | ||
2405 | WARN_ON_ONCE(!mutex_is_locked(&event_mutex)); | |
2406 | ||
2407 | if (WARN_ON_ONCE(!trace_buffered_event_ref)) | |
2408 | return; | |
2409 | ||
2410 | if (--trace_buffered_event_ref) | |
2411 | return; | |
2412 | ||
2413 | preempt_disable(); | |
2414 | /* For each CPU, set the buffer as used. */ | |
2415 | smp_call_function_many(tracing_buffer_mask, | |
2416 | disable_trace_buffered_event, NULL, 1); | |
2417 | preempt_enable(); | |
2418 | ||
2419 | /* Wait for all current users to finish */ | |
74401729 | 2420 | synchronize_rcu(); |
0fc1b09f SRRH |
2421 | |
2422 | for_each_tracing_cpu(cpu) { | |
2423 | free_page((unsigned long)per_cpu(trace_buffered_event, cpu)); | |
2424 | per_cpu(trace_buffered_event, cpu) = NULL; | |
2425 | } | |
2426 | /* | |
2427 | * Make sure trace_buffered_event is NULL before clearing | |
2428 | * trace_buffered_event_cnt. | |
2429 | */ | |
2430 | smp_wmb(); | |
2431 | ||
2432 | preempt_disable(); | |
2433 | /* Do the work on each cpu */ | |
2434 | smp_call_function_many(tracing_buffer_mask, | |
2435 | enable_trace_buffered_event, NULL, 1); | |
2436 | preempt_enable(); | |
51a763dd | 2437 | } |
51a763dd | 2438 | |
2c4a33ab SRRH |
2439 | static struct ring_buffer *temp_buffer; |
2440 | ||
ccb469a1 SR |
2441 | struct ring_buffer_event * |
2442 | trace_event_buffer_lock_reserve(struct ring_buffer **current_rb, | |
7f1d2f82 | 2443 | struct trace_event_file *trace_file, |
ccb469a1 SR |
2444 | int type, unsigned long len, |
2445 | unsigned long flags, int pc) | |
2446 | { | |
2c4a33ab | 2447 | struct ring_buffer_event *entry; |
0fc1b09f | 2448 | int val; |
2c4a33ab | 2449 | |
7f1d2f82 | 2450 | *current_rb = trace_file->tr->trace_buffer.buffer; |
0fc1b09f | 2451 | |
00b41452 | 2452 | if (!ring_buffer_time_stamp_abs(*current_rb) && (trace_file->flags & |
0fc1b09f SRRH |
2453 | (EVENT_FILE_FL_SOFT_DISABLED | EVENT_FILE_FL_FILTERED)) && |
2454 | (entry = this_cpu_read(trace_buffered_event))) { | |
2455 | /* Try to use the per cpu buffer first */ | |
2456 | val = this_cpu_inc_return(trace_buffered_event_cnt); | |
2457 | if (val == 1) { | |
2458 | trace_event_setup(entry, type, flags, pc); | |
2459 | entry->array[0] = len; | |
2460 | return entry; | |
2461 | } | |
2462 | this_cpu_dec(trace_buffered_event_cnt); | |
2463 | } | |
2464 | ||
3e9a8aad SRRH |
2465 | entry = __trace_buffer_lock_reserve(*current_rb, |
2466 | type, len, flags, pc); | |
2c4a33ab SRRH |
2467 | /* |
2468 | * If tracing is off, but we have triggers enabled | |
2469 | * we still need to look at the event data. Use the temp_buffer | |
2470 | * to store the trace event for the tigger to use. It's recusive | |
2471 | * safe and will not be recorded anywhere. | |
2472 | */ | |
5d6ad960 | 2473 | if (!entry && trace_file->flags & EVENT_FILE_FL_TRIGGER_COND) { |
2c4a33ab | 2474 | *current_rb = temp_buffer; |
3e9a8aad SRRH |
2475 | entry = __trace_buffer_lock_reserve(*current_rb, |
2476 | type, len, flags, pc); | |
2c4a33ab SRRH |
2477 | } |
2478 | return entry; | |
ccb469a1 SR |
2479 | } |
2480 | EXPORT_SYMBOL_GPL(trace_event_buffer_lock_reserve); | |
2481 | ||
42391745 SRRH |
2482 | static DEFINE_SPINLOCK(tracepoint_iter_lock); |
2483 | static DEFINE_MUTEX(tracepoint_printk_mutex); | |
2484 | ||
2485 | static void output_printk(struct trace_event_buffer *fbuffer) | |
2486 | { | |
2487 | struct trace_event_call *event_call; | |
2488 | struct trace_event *event; | |
2489 | unsigned long flags; | |
2490 | struct trace_iterator *iter = tracepoint_print_iter; | |
2491 | ||
2492 | /* We should never get here if iter is NULL */ | |
2493 | if (WARN_ON_ONCE(!iter)) | |
2494 | return; | |
2495 | ||
2496 | event_call = fbuffer->trace_file->event_call; | |
2497 | if (!event_call || !event_call->event.funcs || | |
2498 | !event_call->event.funcs->trace) | |
2499 | return; | |
2500 | ||
2501 | event = &fbuffer->trace_file->event_call->event; | |
2502 | ||
2503 | spin_lock_irqsave(&tracepoint_iter_lock, flags); | |
2504 | trace_seq_init(&iter->seq); | |
2505 | iter->ent = fbuffer->entry; | |
2506 | event_call->event.funcs->trace(iter, 0, event); | |
2507 | trace_seq_putc(&iter->seq, 0); | |
2508 | printk("%s", iter->seq.buffer); | |
2509 | ||
2510 | spin_unlock_irqrestore(&tracepoint_iter_lock, flags); | |
2511 | } | |
2512 | ||
2513 | int tracepoint_printk_sysctl(struct ctl_table *table, int write, | |
2514 | void __user *buffer, size_t *lenp, | |
2515 | loff_t *ppos) | |
2516 | { | |
2517 | int save_tracepoint_printk; | |
2518 | int ret; | |
2519 | ||
2520 | mutex_lock(&tracepoint_printk_mutex); | |
2521 | save_tracepoint_printk = tracepoint_printk; | |
2522 | ||
2523 | ret = proc_dointvec(table, write, buffer, lenp, ppos); | |
2524 | ||
2525 | /* | |
2526 | * This will force exiting early, as tracepoint_printk | |
2527 | * is always zero when tracepoint_printk_iter is not allocated | |
2528 | */ | |
2529 | if (!tracepoint_print_iter) | |
2530 | tracepoint_printk = 0; | |
2531 | ||
2532 | if (save_tracepoint_printk == tracepoint_printk) | |
2533 | goto out; | |
2534 | ||
2535 | if (tracepoint_printk) | |
2536 | static_key_enable(&tracepoint_printk_key.key); | |
2537 | else | |
2538 | static_key_disable(&tracepoint_printk_key.key); | |
2539 | ||
2540 | out: | |
2541 | mutex_unlock(&tracepoint_printk_mutex); | |
2542 | ||
2543 | return ret; | |
2544 | } | |
2545 | ||
2546 | void trace_event_buffer_commit(struct trace_event_buffer *fbuffer) | |
2547 | { | |
2548 | if (static_key_false(&tracepoint_printk_key.key)) | |
2549 | output_printk(fbuffer); | |
2550 | ||
2551 | event_trigger_unlock_commit(fbuffer->trace_file, fbuffer->buffer, | |
2552 | fbuffer->event, fbuffer->entry, | |
2553 | fbuffer->flags, fbuffer->pc); | |
2554 | } | |
2555 | EXPORT_SYMBOL_GPL(trace_event_buffer_commit); | |
2556 | ||
2ee5b92a SRV |
2557 | /* |
2558 | * Skip 3: | |
2559 | * | |
2560 | * trace_buffer_unlock_commit_regs() | |
2561 | * trace_event_buffer_commit() | |
2562 | * trace_event_raw_event_xxx() | |
13cf912b | 2563 | */ |
2ee5b92a SRV |
2564 | # define STACK_SKIP 3 |
2565 | ||
b7f0c959 SRRH |
2566 | void trace_buffer_unlock_commit_regs(struct trace_array *tr, |
2567 | struct ring_buffer *buffer, | |
0d5c6e1c SR |
2568 | struct ring_buffer_event *event, |
2569 | unsigned long flags, int pc, | |
2570 | struct pt_regs *regs) | |
1fd8df2c | 2571 | { |
7ffbd48d | 2572 | __buffer_unlock_commit(buffer, event); |
1fd8df2c | 2573 | |
be54f69c | 2574 | /* |
2ee5b92a | 2575 | * If regs is not set, then skip the necessary functions. |
be54f69c SRRH |
2576 | * Note, we can still get here via blktrace, wakeup tracer |
2577 | * and mmiotrace, but that's ok if they lose a function or | |
2ee5b92a | 2578 | * two. They are not that meaningful. |
be54f69c | 2579 | */ |
2ee5b92a | 2580 | ftrace_trace_stack(tr, buffer, flags, regs ? 0 : STACK_SKIP, pc, regs); |
1fd8df2c MH |
2581 | ftrace_trace_userstack(buffer, flags, pc); |
2582 | } | |
1fd8df2c | 2583 | |
52ffabe3 SRRH |
2584 | /* |
2585 | * Similar to trace_buffer_unlock_commit_regs() but do not dump stack. | |
2586 | */ | |
2587 | void | |
2588 | trace_buffer_unlock_commit_nostack(struct ring_buffer *buffer, | |
2589 | struct ring_buffer_event *event) | |
2590 | { | |
2591 | __buffer_unlock_commit(buffer, event); | |
2592 | } | |
2593 | ||
478409dd CZ |
2594 | static void |
2595 | trace_process_export(struct trace_export *export, | |
2596 | struct ring_buffer_event *event) | |
2597 | { | |
2598 | struct trace_entry *entry; | |
2599 | unsigned int size = 0; | |
2600 | ||
2601 | entry = ring_buffer_event_data(event); | |
2602 | size = ring_buffer_event_length(event); | |
a773d419 | 2603 | export->write(export, entry, size); |
478409dd CZ |
2604 | } |
2605 | ||
2606 | static DEFINE_MUTEX(ftrace_export_lock); | |
2607 | ||
2608 | static struct trace_export __rcu *ftrace_exports_list __read_mostly; | |
2609 | ||
2610 | static DEFINE_STATIC_KEY_FALSE(ftrace_exports_enabled); | |
2611 | ||
2612 | static inline void ftrace_exports_enable(void) | |
2613 | { | |
2614 | static_branch_enable(&ftrace_exports_enabled); | |
2615 | } | |
2616 | ||
2617 | static inline void ftrace_exports_disable(void) | |
2618 | { | |
2619 | static_branch_disable(&ftrace_exports_enabled); | |
2620 | } | |
2621 | ||
1cce377d | 2622 | static void ftrace_exports(struct ring_buffer_event *event) |
478409dd CZ |
2623 | { |
2624 | struct trace_export *export; | |
2625 | ||
2626 | preempt_disable_notrace(); | |
2627 | ||
2628 | export = rcu_dereference_raw_notrace(ftrace_exports_list); | |
2629 | while (export) { | |
2630 | trace_process_export(export, event); | |
2631 | export = rcu_dereference_raw_notrace(export->next); | |
2632 | } | |
2633 | ||
2634 | preempt_enable_notrace(); | |
2635 | } | |
2636 | ||
2637 | static inline void | |
2638 | add_trace_export(struct trace_export **list, struct trace_export *export) | |
2639 | { | |
2640 | rcu_assign_pointer(export->next, *list); | |
2641 | /* | |
2642 | * We are entering export into the list but another | |
2643 | * CPU might be walking that list. We need to make sure | |
2644 | * the export->next pointer is valid before another CPU sees | |
2645 | * the export pointer included into the list. | |
2646 | */ | |
2647 | rcu_assign_pointer(*list, export); | |
2648 | } | |
2649 | ||
2650 | static inline int | |
2651 | rm_trace_export(struct trace_export **list, struct trace_export *export) | |
2652 | { | |
2653 | struct trace_export **p; | |
2654 | ||
2655 | for (p = list; *p != NULL; p = &(*p)->next) | |
2656 | if (*p == export) | |
2657 | break; | |
2658 | ||
2659 | if (*p != export) | |
2660 | return -1; | |
2661 | ||
2662 | rcu_assign_pointer(*p, (*p)->next); | |
2663 | ||
2664 | return 0; | |
2665 | } | |
2666 | ||
2667 | static inline void | |
2668 | add_ftrace_export(struct trace_export **list, struct trace_export *export) | |
2669 | { | |
2670 | if (*list == NULL) | |
2671 | ftrace_exports_enable(); | |
2672 | ||
2673 | add_trace_export(list, export); | |
2674 | } | |
2675 | ||
2676 | static inline int | |
2677 | rm_ftrace_export(struct trace_export **list, struct trace_export *export) | |
2678 | { | |
2679 | int ret; | |
2680 | ||
2681 | ret = rm_trace_export(list, export); | |
2682 | if (*list == NULL) | |
2683 | ftrace_exports_disable(); | |
2684 | ||
2685 | return ret; | |
2686 | } | |
2687 | ||
2688 | int register_ftrace_export(struct trace_export *export) | |
2689 | { | |
2690 | if (WARN_ON_ONCE(!export->write)) | |
2691 | return -1; | |
2692 | ||
2693 | mutex_lock(&ftrace_export_lock); | |
2694 | ||
2695 | add_ftrace_export(&ftrace_exports_list, export); | |
2696 | ||
2697 | mutex_unlock(&ftrace_export_lock); | |
2698 | ||
2699 | return 0; | |
2700 | } | |
2701 | EXPORT_SYMBOL_GPL(register_ftrace_export); | |
2702 | ||
2703 | int unregister_ftrace_export(struct trace_export *export) | |
2704 | { | |
2705 | int ret; | |
2706 | ||
2707 | mutex_lock(&ftrace_export_lock); | |
2708 | ||
2709 | ret = rm_ftrace_export(&ftrace_exports_list, export); | |
2710 | ||
2711 | mutex_unlock(&ftrace_export_lock); | |
2712 | ||
2713 | return ret; | |
2714 | } | |
2715 | EXPORT_SYMBOL_GPL(unregister_ftrace_export); | |
2716 | ||
e309b41d | 2717 | void |
7be42151 | 2718 | trace_function(struct trace_array *tr, |
38697053 SR |
2719 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
2720 | int pc) | |
bc0c38d1 | 2721 | { |
2425bcb9 | 2722 | struct trace_event_call *call = &event_function; |
12883efb | 2723 | struct ring_buffer *buffer = tr->trace_buffer.buffer; |
3928a8a2 | 2724 | struct ring_buffer_event *event; |
777e208d | 2725 | struct ftrace_entry *entry; |
bc0c38d1 | 2726 | |
3e9a8aad SRRH |
2727 | event = __trace_buffer_lock_reserve(buffer, TRACE_FN, sizeof(*entry), |
2728 | flags, pc); | |
3928a8a2 SR |
2729 | if (!event) |
2730 | return; | |
2731 | entry = ring_buffer_event_data(event); | |
777e208d SR |
2732 | entry->ip = ip; |
2733 | entry->parent_ip = parent_ip; | |
e1112b4d | 2734 | |
478409dd CZ |
2735 | if (!call_filter_check_discard(call, entry, buffer, event)) { |
2736 | if (static_branch_unlikely(&ftrace_exports_enabled)) | |
2737 | ftrace_exports(event); | |
7ffbd48d | 2738 | __buffer_unlock_commit(buffer, event); |
478409dd | 2739 | } |
bc0c38d1 SR |
2740 | } |
2741 | ||
c0a0d0d3 | 2742 | #ifdef CONFIG_STACKTRACE |
4a9bd3f1 SR |
2743 | |
2744 | #define FTRACE_STACK_MAX_ENTRIES (PAGE_SIZE / sizeof(unsigned long)) | |
2745 | struct ftrace_stack { | |
2746 | unsigned long calls[FTRACE_STACK_MAX_ENTRIES]; | |
2747 | }; | |
2748 | ||
2749 | static DEFINE_PER_CPU(struct ftrace_stack, ftrace_stack); | |
2750 | static DEFINE_PER_CPU(int, ftrace_stack_reserve); | |
2751 | ||
e77405ad | 2752 | static void __ftrace_trace_stack(struct ring_buffer *buffer, |
53614991 | 2753 | unsigned long flags, |
1fd8df2c | 2754 | int skip, int pc, struct pt_regs *regs) |
86387f7e | 2755 | { |
2425bcb9 | 2756 | struct trace_event_call *call = &event_kernel_stack; |
3928a8a2 | 2757 | struct ring_buffer_event *event; |
777e208d | 2758 | struct stack_entry *entry; |
86387f7e | 2759 | struct stack_trace trace; |
4a9bd3f1 SR |
2760 | int use_stack; |
2761 | int size = FTRACE_STACK_ENTRIES; | |
2762 | ||
2763 | trace.nr_entries = 0; | |
2764 | trace.skip = skip; | |
2765 | ||
be54f69c | 2766 | /* |
2ee5b92a | 2767 | * Add one, for this function and the call to save_stack_trace() |
be54f69c SRRH |
2768 | * If regs is set, then these functions will not be in the way. |
2769 | */ | |
2ee5b92a | 2770 | #ifndef CONFIG_UNWINDER_ORC |
be54f69c | 2771 | if (!regs) |
2ee5b92a SRV |
2772 | trace.skip++; |
2773 | #endif | |
be54f69c | 2774 | |
4a9bd3f1 SR |
2775 | /* |
2776 | * Since events can happen in NMIs there's no safe way to | |
2777 | * use the per cpu ftrace_stacks. We reserve it and if an interrupt | |
2778 | * or NMI comes in, it will just have to use the default | |
2779 | * FTRACE_STACK_SIZE. | |
2780 | */ | |
2781 | preempt_disable_notrace(); | |
2782 | ||
82146529 | 2783 | use_stack = __this_cpu_inc_return(ftrace_stack_reserve); |
4a9bd3f1 SR |
2784 | /* |
2785 | * We don't need any atomic variables, just a barrier. | |
2786 | * If an interrupt comes in, we don't care, because it would | |
2787 | * have exited and put the counter back to what we want. | |
2788 | * We just need a barrier to keep gcc from moving things | |
2789 | * around. | |
2790 | */ | |
2791 | barrier(); | |
2792 | if (use_stack == 1) { | |
bdffd893 | 2793 | trace.entries = this_cpu_ptr(ftrace_stack.calls); |
4a9bd3f1 SR |
2794 | trace.max_entries = FTRACE_STACK_MAX_ENTRIES; |
2795 | ||
2796 | if (regs) | |
2797 | save_stack_trace_regs(regs, &trace); | |
2798 | else | |
2799 | save_stack_trace(&trace); | |
2800 | ||
2801 | if (trace.nr_entries > size) | |
2802 | size = trace.nr_entries; | |
2803 | } else | |
2804 | /* From now on, use_stack is a boolean */ | |
2805 | use_stack = 0; | |
2806 | ||
2807 | size *= sizeof(unsigned long); | |
86387f7e | 2808 | |
3e9a8aad SRRH |
2809 | event = __trace_buffer_lock_reserve(buffer, TRACE_STACK, |
2810 | sizeof(*entry) + size, flags, pc); | |
3928a8a2 | 2811 | if (!event) |
4a9bd3f1 SR |
2812 | goto out; |
2813 | entry = ring_buffer_event_data(event); | |
86387f7e | 2814 | |
4a9bd3f1 SR |
2815 | memset(&entry->caller, 0, size); |
2816 | ||
2817 | if (use_stack) | |
2818 | memcpy(&entry->caller, trace.entries, | |
2819 | trace.nr_entries * sizeof(unsigned long)); | |
2820 | else { | |
2821 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
2822 | trace.entries = entry->caller; | |
2823 | if (regs) | |
2824 | save_stack_trace_regs(regs, &trace); | |
2825 | else | |
2826 | save_stack_trace(&trace); | |
2827 | } | |
2828 | ||
2829 | entry->size = trace.nr_entries; | |
86387f7e | 2830 | |
f306cc82 | 2831 | if (!call_filter_check_discard(call, entry, buffer, event)) |
7ffbd48d | 2832 | __buffer_unlock_commit(buffer, event); |
4a9bd3f1 SR |
2833 | |
2834 | out: | |
2835 | /* Again, don't let gcc optimize things here */ | |
2836 | barrier(); | |
82146529 | 2837 | __this_cpu_dec(ftrace_stack_reserve); |
4a9bd3f1 SR |
2838 | preempt_enable_notrace(); |
2839 | ||
f0a920d5 IM |
2840 | } |
2841 | ||
2d34f489 SRRH |
2842 | static inline void ftrace_trace_stack(struct trace_array *tr, |
2843 | struct ring_buffer *buffer, | |
73dddbb5 SRRH |
2844 | unsigned long flags, |
2845 | int skip, int pc, struct pt_regs *regs) | |
53614991 | 2846 | { |
2d34f489 | 2847 | if (!(tr->trace_flags & TRACE_ITER_STACKTRACE)) |
53614991 SR |
2848 | return; |
2849 | ||
73dddbb5 | 2850 | __ftrace_trace_stack(buffer, flags, skip, pc, regs); |
53614991 SR |
2851 | } |
2852 | ||
c0a0d0d3 FW |
2853 | void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, |
2854 | int pc) | |
38697053 | 2855 | { |
a33d7d94 SRV |
2856 | struct ring_buffer *buffer = tr->trace_buffer.buffer; |
2857 | ||
2858 | if (rcu_is_watching()) { | |
2859 | __ftrace_trace_stack(buffer, flags, skip, pc, NULL); | |
2860 | return; | |
2861 | } | |
2862 | ||
2863 | /* | |
2864 | * When an NMI triggers, RCU is enabled via rcu_nmi_enter(), | |
2865 | * but if the above rcu_is_watching() failed, then the NMI | |
2866 | * triggered someplace critical, and rcu_irq_enter() should | |
2867 | * not be called from NMI. | |
2868 | */ | |
2869 | if (unlikely(in_nmi())) | |
2870 | return; | |
2871 | ||
a33d7d94 SRV |
2872 | rcu_irq_enter_irqson(); |
2873 | __ftrace_trace_stack(buffer, flags, skip, pc, NULL); | |
2874 | rcu_irq_exit_irqson(); | |
38697053 SR |
2875 | } |
2876 | ||
03889384 SR |
2877 | /** |
2878 | * trace_dump_stack - record a stack back trace in the trace buffer | |
c142be8e | 2879 | * @skip: Number of functions to skip (helper handlers) |
03889384 | 2880 | */ |
c142be8e | 2881 | void trace_dump_stack(int skip) |
03889384 SR |
2882 | { |
2883 | unsigned long flags; | |
2884 | ||
2885 | if (tracing_disabled || tracing_selftest_running) | |
e36c5458 | 2886 | return; |
03889384 SR |
2887 | |
2888 | local_save_flags(flags); | |
2889 | ||
2ee5b92a SRV |
2890 | #ifndef CONFIG_UNWINDER_ORC |
2891 | /* Skip 1 to skip this function. */ | |
2892 | skip++; | |
2893 | #endif | |
c142be8e SRRH |
2894 | __ftrace_trace_stack(global_trace.trace_buffer.buffer, |
2895 | flags, skip, preempt_count(), NULL); | |
03889384 | 2896 | } |
da387e5c | 2897 | EXPORT_SYMBOL_GPL(trace_dump_stack); |
03889384 | 2898 | |
91e86e56 SR |
2899 | static DEFINE_PER_CPU(int, user_stack_count); |
2900 | ||
e77405ad SR |
2901 | void |
2902 | ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, int pc) | |
02b67518 | 2903 | { |
2425bcb9 | 2904 | struct trace_event_call *call = &event_user_stack; |
8d7c6a96 | 2905 | struct ring_buffer_event *event; |
02b67518 TE |
2906 | struct userstack_entry *entry; |
2907 | struct stack_trace trace; | |
02b67518 | 2908 | |
983f938a | 2909 | if (!(global_trace.trace_flags & TRACE_ITER_USERSTACKTRACE)) |
02b67518 TE |
2910 | return; |
2911 | ||
b6345879 SR |
2912 | /* |
2913 | * NMIs can not handle page faults, even with fix ups. | |
2914 | * The save user stack can (and often does) fault. | |
2915 | */ | |
2916 | if (unlikely(in_nmi())) | |
2917 | return; | |
02b67518 | 2918 | |
91e86e56 SR |
2919 | /* |
2920 | * prevent recursion, since the user stack tracing may | |
2921 | * trigger other kernel events. | |
2922 | */ | |
2923 | preempt_disable(); | |
2924 | if (__this_cpu_read(user_stack_count)) | |
2925 | goto out; | |
2926 | ||
2927 | __this_cpu_inc(user_stack_count); | |
2928 | ||
3e9a8aad SRRH |
2929 | event = __trace_buffer_lock_reserve(buffer, TRACE_USER_STACK, |
2930 | sizeof(*entry), flags, pc); | |
02b67518 | 2931 | if (!event) |
1dbd1951 | 2932 | goto out_drop_count; |
02b67518 | 2933 | entry = ring_buffer_event_data(event); |
02b67518 | 2934 | |
48659d31 | 2935 | entry->tgid = current->tgid; |
02b67518 TE |
2936 | memset(&entry->caller, 0, sizeof(entry->caller)); |
2937 | ||
2938 | trace.nr_entries = 0; | |
2939 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
2940 | trace.skip = 0; | |
2941 | trace.entries = entry->caller; | |
2942 | ||
2943 | save_stack_trace_user(&trace); | |
f306cc82 | 2944 | if (!call_filter_check_discard(call, entry, buffer, event)) |
7ffbd48d | 2945 | __buffer_unlock_commit(buffer, event); |
91e86e56 | 2946 | |
1dbd1951 | 2947 | out_drop_count: |
91e86e56 | 2948 | __this_cpu_dec(user_stack_count); |
91e86e56 SR |
2949 | out: |
2950 | preempt_enable(); | |
02b67518 TE |
2951 | } |
2952 | ||
4fd27358 HE |
2953 | #ifdef UNUSED |
2954 | static void __trace_userstack(struct trace_array *tr, unsigned long flags) | |
02b67518 | 2955 | { |
7be42151 | 2956 | ftrace_trace_userstack(tr, flags, preempt_count()); |
02b67518 | 2957 | } |
4fd27358 | 2958 | #endif /* UNUSED */ |
02b67518 | 2959 | |
c0a0d0d3 FW |
2960 | #endif /* CONFIG_STACKTRACE */ |
2961 | ||
07d777fe SR |
2962 | /* created for use with alloc_percpu */ |
2963 | struct trace_buffer_struct { | |
e2ace001 AL |
2964 | int nesting; |
2965 | char buffer[4][TRACE_BUF_SIZE]; | |
07d777fe SR |
2966 | }; |
2967 | ||
2968 | static struct trace_buffer_struct *trace_percpu_buffer; | |
07d777fe SR |
2969 | |
2970 | /* | |
e2ace001 AL |
2971 | * Thise allows for lockless recording. If we're nested too deeply, then |
2972 | * this returns NULL. | |
07d777fe SR |
2973 | */ |
2974 | static char *get_trace_buf(void) | |
2975 | { | |
e2ace001 | 2976 | struct trace_buffer_struct *buffer = this_cpu_ptr(trace_percpu_buffer); |
07d777fe | 2977 | |
e2ace001 | 2978 | if (!buffer || buffer->nesting >= 4) |
07d777fe SR |
2979 | return NULL; |
2980 | ||
3d9622c1 SRV |
2981 | buffer->nesting++; |
2982 | ||
2983 | /* Interrupts must see nesting incremented before we use the buffer */ | |
2984 | barrier(); | |
2985 | return &buffer->buffer[buffer->nesting][0]; | |
e2ace001 AL |
2986 | } |
2987 | ||
2988 | static void put_trace_buf(void) | |
2989 | { | |
3d9622c1 SRV |
2990 | /* Don't let the decrement of nesting leak before this */ |
2991 | barrier(); | |
e2ace001 | 2992 | this_cpu_dec(trace_percpu_buffer->nesting); |
07d777fe SR |
2993 | } |
2994 | ||
2995 | static int alloc_percpu_trace_buffer(void) | |
2996 | { | |
2997 | struct trace_buffer_struct *buffers; | |
07d777fe SR |
2998 | |
2999 | buffers = alloc_percpu(struct trace_buffer_struct); | |
e2ace001 AL |
3000 | if (WARN(!buffers, "Could not allocate percpu trace_printk buffer")) |
3001 | return -ENOMEM; | |
07d777fe SR |
3002 | |
3003 | trace_percpu_buffer = buffers; | |
07d777fe | 3004 | return 0; |
07d777fe SR |
3005 | } |
3006 | ||
81698831 SR |
3007 | static int buffers_allocated; |
3008 | ||
07d777fe SR |
3009 | void trace_printk_init_buffers(void) |
3010 | { | |
07d777fe SR |
3011 | if (buffers_allocated) |
3012 | return; | |
3013 | ||
3014 | if (alloc_percpu_trace_buffer()) | |
3015 | return; | |
3016 | ||
2184db46 SR |
3017 | /* trace_printk() is for debug use only. Don't use it in production. */ |
3018 | ||
a395d6a7 JP |
3019 | pr_warn("\n"); |
3020 | pr_warn("**********************************************************\n"); | |
3021 | pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n"); | |
3022 | pr_warn("** **\n"); | |
3023 | pr_warn("** trace_printk() being used. Allocating extra memory. **\n"); | |
3024 | pr_warn("** **\n"); | |
3025 | pr_warn("** This means that this is a DEBUG kernel and it is **\n"); | |
3026 | pr_warn("** unsafe for production use. **\n"); | |
3027 | pr_warn("** **\n"); | |
3028 | pr_warn("** If you see this message and you are not debugging **\n"); | |
3029 | pr_warn("** the kernel, report this immediately to your vendor! **\n"); | |
3030 | pr_warn("** **\n"); | |
3031 | pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n"); | |
3032 | pr_warn("**********************************************************\n"); | |
07d777fe | 3033 | |
b382ede6 SR |
3034 | /* Expand the buffers to set size */ |
3035 | tracing_update_buffers(); | |
3036 | ||
07d777fe | 3037 | buffers_allocated = 1; |
81698831 SR |
3038 | |
3039 | /* | |
3040 | * trace_printk_init_buffers() can be called by modules. | |
3041 | * If that happens, then we need to start cmdline recording | |
3042 | * directly here. If the global_trace.buffer is already | |
3043 | * allocated here, then this was called by module code. | |
3044 | */ | |
12883efb | 3045 | if (global_trace.trace_buffer.buffer) |
81698831 SR |
3046 | tracing_start_cmdline_record(); |
3047 | } | |
3048 | ||
3049 | void trace_printk_start_comm(void) | |
3050 | { | |
3051 | /* Start tracing comms if trace printk is set */ | |
3052 | if (!buffers_allocated) | |
3053 | return; | |
3054 | tracing_start_cmdline_record(); | |
3055 | } | |
3056 | ||
3057 | static void trace_printk_start_stop_comm(int enabled) | |
3058 | { | |
3059 | if (!buffers_allocated) | |
3060 | return; | |
3061 | ||
3062 | if (enabled) | |
3063 | tracing_start_cmdline_record(); | |
3064 | else | |
3065 | tracing_stop_cmdline_record(); | |
07d777fe SR |
3066 | } |
3067 | ||
769b0441 | 3068 | /** |
48ead020 | 3069 | * trace_vbprintk - write binary msg to tracing buffer |
769b0441 FW |
3070 | * |
3071 | */ | |
40ce74f1 | 3072 | int trace_vbprintk(unsigned long ip, const char *fmt, va_list args) |
769b0441 | 3073 | { |
2425bcb9 | 3074 | struct trace_event_call *call = &event_bprint; |
769b0441 | 3075 | struct ring_buffer_event *event; |
e77405ad | 3076 | struct ring_buffer *buffer; |
769b0441 | 3077 | struct trace_array *tr = &global_trace; |
48ead020 | 3078 | struct bprint_entry *entry; |
769b0441 | 3079 | unsigned long flags; |
07d777fe SR |
3080 | char *tbuffer; |
3081 | int len = 0, size, pc; | |
769b0441 FW |
3082 | |
3083 | if (unlikely(tracing_selftest_running || tracing_disabled)) | |
3084 | return 0; | |
3085 | ||
3086 | /* Don't pollute graph traces with trace_vprintk internals */ | |
3087 | pause_graph_tracing(); | |
3088 | ||
3089 | pc = preempt_count(); | |
5168ae50 | 3090 | preempt_disable_notrace(); |
769b0441 | 3091 | |
07d777fe SR |
3092 | tbuffer = get_trace_buf(); |
3093 | if (!tbuffer) { | |
3094 | len = 0; | |
e2ace001 | 3095 | goto out_nobuffer; |
07d777fe | 3096 | } |
769b0441 | 3097 | |
07d777fe | 3098 | len = vbin_printf((u32 *)tbuffer, TRACE_BUF_SIZE/sizeof(int), fmt, args); |
769b0441 | 3099 | |
07d777fe SR |
3100 | if (len > TRACE_BUF_SIZE/sizeof(int) || len < 0) |
3101 | goto out; | |
769b0441 | 3102 | |
07d777fe | 3103 | local_save_flags(flags); |
769b0441 | 3104 | size = sizeof(*entry) + sizeof(u32) * len; |
12883efb | 3105 | buffer = tr->trace_buffer.buffer; |
3e9a8aad SRRH |
3106 | event = __trace_buffer_lock_reserve(buffer, TRACE_BPRINT, size, |
3107 | flags, pc); | |
769b0441 | 3108 | if (!event) |
07d777fe | 3109 | goto out; |
769b0441 FW |
3110 | entry = ring_buffer_event_data(event); |
3111 | entry->ip = ip; | |
769b0441 FW |
3112 | entry->fmt = fmt; |
3113 | ||
07d777fe | 3114 | memcpy(entry->buf, tbuffer, sizeof(u32) * len); |
f306cc82 | 3115 | if (!call_filter_check_discard(call, entry, buffer, event)) { |
7ffbd48d | 3116 | __buffer_unlock_commit(buffer, event); |
2d34f489 | 3117 | ftrace_trace_stack(tr, buffer, flags, 6, pc, NULL); |
d931369b | 3118 | } |
769b0441 | 3119 | |
769b0441 | 3120 | out: |
e2ace001 AL |
3121 | put_trace_buf(); |
3122 | ||
3123 | out_nobuffer: | |
5168ae50 | 3124 | preempt_enable_notrace(); |
769b0441 FW |
3125 | unpause_graph_tracing(); |
3126 | ||
3127 | return len; | |
3128 | } | |
48ead020 FW |
3129 | EXPORT_SYMBOL_GPL(trace_vbprintk); |
3130 | ||
26b68dd2 | 3131 | __printf(3, 0) |
12883efb SRRH |
3132 | static int |
3133 | __trace_array_vprintk(struct ring_buffer *buffer, | |
3134 | unsigned long ip, const char *fmt, va_list args) | |
48ead020 | 3135 | { |
2425bcb9 | 3136 | struct trace_event_call *call = &event_print; |
48ead020 | 3137 | struct ring_buffer_event *event; |
07d777fe | 3138 | int len = 0, size, pc; |
48ead020 | 3139 | struct print_entry *entry; |
07d777fe SR |
3140 | unsigned long flags; |
3141 | char *tbuffer; | |
48ead020 FW |
3142 | |
3143 | if (tracing_disabled || tracing_selftest_running) | |
3144 | return 0; | |
3145 | ||
07d777fe SR |
3146 | /* Don't pollute graph traces with trace_vprintk internals */ |
3147 | pause_graph_tracing(); | |
3148 | ||
48ead020 FW |
3149 | pc = preempt_count(); |
3150 | preempt_disable_notrace(); | |
48ead020 | 3151 | |
07d777fe SR |
3152 | |
3153 | tbuffer = get_trace_buf(); | |
3154 | if (!tbuffer) { | |
3155 | len = 0; | |
e2ace001 | 3156 | goto out_nobuffer; |
07d777fe | 3157 | } |
48ead020 | 3158 | |
3558a5ac | 3159 | len = vscnprintf(tbuffer, TRACE_BUF_SIZE, fmt, args); |
48ead020 | 3160 | |
07d777fe | 3161 | local_save_flags(flags); |
48ead020 | 3162 | size = sizeof(*entry) + len + 1; |
3e9a8aad SRRH |
3163 | event = __trace_buffer_lock_reserve(buffer, TRACE_PRINT, size, |
3164 | flags, pc); | |
48ead020 | 3165 | if (!event) |
07d777fe | 3166 | goto out; |
48ead020 | 3167 | entry = ring_buffer_event_data(event); |
c13d2f7c | 3168 | entry->ip = ip; |
48ead020 | 3169 | |
3558a5ac | 3170 | memcpy(&entry->buf, tbuffer, len + 1); |
f306cc82 | 3171 | if (!call_filter_check_discard(call, entry, buffer, event)) { |
7ffbd48d | 3172 | __buffer_unlock_commit(buffer, event); |
2d34f489 | 3173 | ftrace_trace_stack(&global_trace, buffer, flags, 6, pc, NULL); |
d931369b | 3174 | } |
e2ace001 AL |
3175 | |
3176 | out: | |
3177 | put_trace_buf(); | |
3178 | ||
3179 | out_nobuffer: | |
48ead020 | 3180 | preempt_enable_notrace(); |
07d777fe | 3181 | unpause_graph_tracing(); |
48ead020 FW |
3182 | |
3183 | return len; | |
3184 | } | |
659372d3 | 3185 | |
26b68dd2 | 3186 | __printf(3, 0) |
12883efb SRRH |
3187 | int trace_array_vprintk(struct trace_array *tr, |
3188 | unsigned long ip, const char *fmt, va_list args) | |
3189 | { | |
3190 | return __trace_array_vprintk(tr->trace_buffer.buffer, ip, fmt, args); | |
3191 | } | |
3192 | ||
26b68dd2 | 3193 | __printf(3, 0) |
12883efb SRRH |
3194 | int trace_array_printk(struct trace_array *tr, |
3195 | unsigned long ip, const char *fmt, ...) | |
3196 | { | |
3197 | int ret; | |
3198 | va_list ap; | |
3199 | ||
983f938a | 3200 | if (!(global_trace.trace_flags & TRACE_ITER_PRINTK)) |
12883efb SRRH |
3201 | return 0; |
3202 | ||
3203 | va_start(ap, fmt); | |
3204 | ret = trace_array_vprintk(tr, ip, fmt, ap); | |
3205 | va_end(ap); | |
3206 | return ret; | |
3207 | } | |
3208 | ||
26b68dd2 | 3209 | __printf(3, 4) |
12883efb SRRH |
3210 | int trace_array_printk_buf(struct ring_buffer *buffer, |
3211 | unsigned long ip, const char *fmt, ...) | |
3212 | { | |
3213 | int ret; | |
3214 | va_list ap; | |
3215 | ||
983f938a | 3216 | if (!(global_trace.trace_flags & TRACE_ITER_PRINTK)) |
12883efb SRRH |
3217 | return 0; |
3218 | ||
3219 | va_start(ap, fmt); | |
3220 | ret = __trace_array_vprintk(buffer, ip, fmt, ap); | |
3221 | va_end(ap); | |
3222 | return ret; | |
3223 | } | |
3224 | ||
26b68dd2 | 3225 | __printf(2, 0) |
659372d3 SR |
3226 | int trace_vprintk(unsigned long ip, const char *fmt, va_list args) |
3227 | { | |
a813a159 | 3228 | return trace_array_vprintk(&global_trace, ip, fmt, args); |
659372d3 | 3229 | } |
769b0441 FW |
3230 | EXPORT_SYMBOL_GPL(trace_vprintk); |
3231 | ||
e2ac8ef5 | 3232 | static void trace_iterator_increment(struct trace_iterator *iter) |
5a90f577 | 3233 | { |
6d158a81 SR |
3234 | struct ring_buffer_iter *buf_iter = trace_buffer_iter(iter, iter->cpu); |
3235 | ||
5a90f577 | 3236 | iter->idx++; |
6d158a81 SR |
3237 | if (buf_iter) |
3238 | ring_buffer_read(buf_iter, NULL); | |
5a90f577 SR |
3239 | } |
3240 | ||
e309b41d | 3241 | static struct trace_entry * |
bc21b478 SR |
3242 | peek_next_entry(struct trace_iterator *iter, int cpu, u64 *ts, |
3243 | unsigned long *lost_events) | |
dd0e545f | 3244 | { |
3928a8a2 | 3245 | struct ring_buffer_event *event; |
6d158a81 | 3246 | struct ring_buffer_iter *buf_iter = trace_buffer_iter(iter, cpu); |
dd0e545f | 3247 | |
d769041f SR |
3248 | if (buf_iter) |
3249 | event = ring_buffer_iter_peek(buf_iter, ts); | |
3250 | else | |
12883efb | 3251 | event = ring_buffer_peek(iter->trace_buffer->buffer, cpu, ts, |
bc21b478 | 3252 | lost_events); |
d769041f | 3253 | |
4a9bd3f1 SR |
3254 | if (event) { |
3255 | iter->ent_size = ring_buffer_event_length(event); | |
3256 | return ring_buffer_event_data(event); | |
3257 | } | |
3258 | iter->ent_size = 0; | |
3259 | return NULL; | |
dd0e545f | 3260 | } |
d769041f | 3261 | |
dd0e545f | 3262 | static struct trace_entry * |
bc21b478 SR |
3263 | __find_next_entry(struct trace_iterator *iter, int *ent_cpu, |
3264 | unsigned long *missing_events, u64 *ent_ts) | |
bc0c38d1 | 3265 | { |
12883efb | 3266 | struct ring_buffer *buffer = iter->trace_buffer->buffer; |
bc0c38d1 | 3267 | struct trace_entry *ent, *next = NULL; |
aa27497c | 3268 | unsigned long lost_events = 0, next_lost = 0; |
b04cc6b1 | 3269 | int cpu_file = iter->cpu_file; |
3928a8a2 | 3270 | u64 next_ts = 0, ts; |
bc0c38d1 | 3271 | int next_cpu = -1; |
12b5da34 | 3272 | int next_size = 0; |
bc0c38d1 SR |
3273 | int cpu; |
3274 | ||
b04cc6b1 FW |
3275 | /* |
3276 | * If we are in a per_cpu trace file, don't bother by iterating over | |
3277 | * all cpu and peek directly. | |
3278 | */ | |
ae3b5093 | 3279 | if (cpu_file > RING_BUFFER_ALL_CPUS) { |
b04cc6b1 FW |
3280 | if (ring_buffer_empty_cpu(buffer, cpu_file)) |
3281 | return NULL; | |
bc21b478 | 3282 | ent = peek_next_entry(iter, cpu_file, ent_ts, missing_events); |
b04cc6b1 FW |
3283 | if (ent_cpu) |
3284 | *ent_cpu = cpu_file; | |
3285 | ||
3286 | return ent; | |
3287 | } | |
3288 | ||
ab46428c | 3289 | for_each_tracing_cpu(cpu) { |
dd0e545f | 3290 | |
3928a8a2 SR |
3291 | if (ring_buffer_empty_cpu(buffer, cpu)) |
3292 | continue; | |
dd0e545f | 3293 | |
bc21b478 | 3294 | ent = peek_next_entry(iter, cpu, &ts, &lost_events); |
dd0e545f | 3295 | |
cdd31cd2 IM |
3296 | /* |
3297 | * Pick the entry with the smallest timestamp: | |
3298 | */ | |
3928a8a2 | 3299 | if (ent && (!next || ts < next_ts)) { |
bc0c38d1 SR |
3300 | next = ent; |
3301 | next_cpu = cpu; | |
3928a8a2 | 3302 | next_ts = ts; |
bc21b478 | 3303 | next_lost = lost_events; |
12b5da34 | 3304 | next_size = iter->ent_size; |
bc0c38d1 SR |
3305 | } |
3306 | } | |
3307 | ||
12b5da34 SR |
3308 | iter->ent_size = next_size; |
3309 | ||
bc0c38d1 SR |
3310 | if (ent_cpu) |
3311 | *ent_cpu = next_cpu; | |
3312 | ||
3928a8a2 SR |
3313 | if (ent_ts) |
3314 | *ent_ts = next_ts; | |
3315 | ||
bc21b478 SR |
3316 | if (missing_events) |
3317 | *missing_events = next_lost; | |
3318 | ||
bc0c38d1 SR |
3319 | return next; |
3320 | } | |
3321 | ||
dd0e545f | 3322 | /* Find the next real entry, without updating the iterator itself */ |
c4a8e8be FW |
3323 | struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, |
3324 | int *ent_cpu, u64 *ent_ts) | |
bc0c38d1 | 3325 | { |
bc21b478 | 3326 | return __find_next_entry(iter, ent_cpu, NULL, ent_ts); |
dd0e545f SR |
3327 | } |
3328 | ||
3329 | /* Find the next real entry, and increment the iterator to the next entry */ | |
955b61e5 | 3330 | void *trace_find_next_entry_inc(struct trace_iterator *iter) |
dd0e545f | 3331 | { |
bc21b478 SR |
3332 | iter->ent = __find_next_entry(iter, &iter->cpu, |
3333 | &iter->lost_events, &iter->ts); | |
dd0e545f | 3334 | |
3928a8a2 | 3335 | if (iter->ent) |
e2ac8ef5 | 3336 | trace_iterator_increment(iter); |
dd0e545f | 3337 | |
3928a8a2 | 3338 | return iter->ent ? iter : NULL; |
b3806b43 | 3339 | } |
bc0c38d1 | 3340 | |
e309b41d | 3341 | static void trace_consume(struct trace_iterator *iter) |
b3806b43 | 3342 | { |
12883efb | 3343 | ring_buffer_consume(iter->trace_buffer->buffer, iter->cpu, &iter->ts, |
bc21b478 | 3344 | &iter->lost_events); |
bc0c38d1 SR |
3345 | } |
3346 | ||
e309b41d | 3347 | static void *s_next(struct seq_file *m, void *v, loff_t *pos) |
bc0c38d1 SR |
3348 | { |
3349 | struct trace_iterator *iter = m->private; | |
bc0c38d1 | 3350 | int i = (int)*pos; |
4e3c3333 | 3351 | void *ent; |
bc0c38d1 | 3352 | |
a63ce5b3 SR |
3353 | WARN_ON_ONCE(iter->leftover); |
3354 | ||
bc0c38d1 SR |
3355 | (*pos)++; |
3356 | ||
3357 | /* can't go backwards */ | |
3358 | if (iter->idx > i) | |
3359 | return NULL; | |
3360 | ||
3361 | if (iter->idx < 0) | |
955b61e5 | 3362 | ent = trace_find_next_entry_inc(iter); |
bc0c38d1 SR |
3363 | else |
3364 | ent = iter; | |
3365 | ||
3366 | while (ent && iter->idx < i) | |
955b61e5 | 3367 | ent = trace_find_next_entry_inc(iter); |
bc0c38d1 SR |
3368 | |
3369 | iter->pos = *pos; | |
3370 | ||
bc0c38d1 SR |
3371 | return ent; |
3372 | } | |
3373 | ||
955b61e5 | 3374 | void tracing_iter_reset(struct trace_iterator *iter, int cpu) |
2f26ebd5 | 3375 | { |
2f26ebd5 SR |
3376 | struct ring_buffer_event *event; |
3377 | struct ring_buffer_iter *buf_iter; | |
3378 | unsigned long entries = 0; | |
3379 | u64 ts; | |
3380 | ||
12883efb | 3381 | per_cpu_ptr(iter->trace_buffer->data, cpu)->skipped_entries = 0; |
2f26ebd5 | 3382 | |
6d158a81 SR |
3383 | buf_iter = trace_buffer_iter(iter, cpu); |
3384 | if (!buf_iter) | |
2f26ebd5 SR |
3385 | return; |
3386 | ||
2f26ebd5 SR |
3387 | ring_buffer_iter_reset(buf_iter); |
3388 | ||
3389 | /* | |
3390 | * We could have the case with the max latency tracers | |
3391 | * that a reset never took place on a cpu. This is evident | |
3392 | * by the timestamp being before the start of the buffer. | |
3393 | */ | |
3394 | while ((event = ring_buffer_iter_peek(buf_iter, &ts))) { | |
12883efb | 3395 | if (ts >= iter->trace_buffer->time_start) |
2f26ebd5 SR |
3396 | break; |
3397 | entries++; | |
3398 | ring_buffer_read(buf_iter, NULL); | |
3399 | } | |
3400 | ||
12883efb | 3401 | per_cpu_ptr(iter->trace_buffer->data, cpu)->skipped_entries = entries; |
2f26ebd5 SR |
3402 | } |
3403 | ||
d7350c3f | 3404 | /* |
d7350c3f FW |
3405 | * The current tracer is copied to avoid a global locking |
3406 | * all around. | |
3407 | */ | |
bc0c38d1 SR |
3408 | static void *s_start(struct seq_file *m, loff_t *pos) |
3409 | { | |
3410 | struct trace_iterator *iter = m->private; | |
2b6080f2 | 3411 | struct trace_array *tr = iter->tr; |
b04cc6b1 | 3412 | int cpu_file = iter->cpu_file; |
bc0c38d1 SR |
3413 | void *p = NULL; |
3414 | loff_t l = 0; | |
3928a8a2 | 3415 | int cpu; |
bc0c38d1 | 3416 | |
2fd196ec HT |
3417 | /* |
3418 | * copy the tracer to avoid using a global lock all around. | |
3419 | * iter->trace is a copy of current_trace, the pointer to the | |
3420 | * name may be used instead of a strcmp(), as iter->trace->name | |
3421 | * will point to the same string as current_trace->name. | |
3422 | */ | |
bc0c38d1 | 3423 | mutex_lock(&trace_types_lock); |
2b6080f2 SR |
3424 | if (unlikely(tr->current_trace && iter->trace->name != tr->current_trace->name)) |
3425 | *iter->trace = *tr->current_trace; | |
d7350c3f | 3426 | mutex_unlock(&trace_types_lock); |
bc0c38d1 | 3427 | |
12883efb | 3428 | #ifdef CONFIG_TRACER_MAX_TRACE |
debdd57f HT |
3429 | if (iter->snapshot && iter->trace->use_max_tr) |
3430 | return ERR_PTR(-EBUSY); | |
12883efb | 3431 | #endif |
debdd57f HT |
3432 | |
3433 | if (!iter->snapshot) | |
d914ba37 | 3434 | atomic_inc(&trace_record_taskinfo_disabled); |
bc0c38d1 | 3435 | |
bc0c38d1 SR |
3436 | if (*pos != iter->pos) { |
3437 | iter->ent = NULL; | |
3438 | iter->cpu = 0; | |
3439 | iter->idx = -1; | |
3440 | ||
ae3b5093 | 3441 | if (cpu_file == RING_BUFFER_ALL_CPUS) { |
b04cc6b1 | 3442 | for_each_tracing_cpu(cpu) |
2f26ebd5 | 3443 | tracing_iter_reset(iter, cpu); |
b04cc6b1 | 3444 | } else |
2f26ebd5 | 3445 | tracing_iter_reset(iter, cpu_file); |
bc0c38d1 | 3446 | |
ac91d854 | 3447 | iter->leftover = 0; |
bc0c38d1 SR |
3448 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) |
3449 | ; | |
3450 | ||
3451 | } else { | |
a63ce5b3 SR |
3452 | /* |
3453 | * If we overflowed the seq_file before, then we want | |
3454 | * to just reuse the trace_seq buffer again. | |
3455 | */ | |
3456 | if (iter->leftover) | |
3457 | p = iter; | |
3458 | else { | |
3459 | l = *pos - 1; | |
3460 | p = s_next(m, p, &l); | |
3461 | } | |
bc0c38d1 SR |
3462 | } |
3463 | ||
4f535968 | 3464 | trace_event_read_lock(); |
7e53bd42 | 3465 | trace_access_lock(cpu_file); |
bc0c38d1 SR |
3466 | return p; |
3467 | } | |
3468 | ||
3469 | static void s_stop(struct seq_file *m, void *p) | |
3470 | { | |
7e53bd42 LJ |
3471 | struct trace_iterator *iter = m->private; |
3472 | ||
12883efb | 3473 | #ifdef CONFIG_TRACER_MAX_TRACE |
debdd57f HT |
3474 | if (iter->snapshot && iter->trace->use_max_tr) |
3475 | return; | |
12883efb | 3476 | #endif |
debdd57f HT |
3477 | |
3478 | if (!iter->snapshot) | |
d914ba37 | 3479 | atomic_dec(&trace_record_taskinfo_disabled); |
12883efb | 3480 | |
7e53bd42 | 3481 | trace_access_unlock(iter->cpu_file); |
4f535968 | 3482 | trace_event_read_unlock(); |
bc0c38d1 SR |
3483 | } |
3484 | ||
39eaf7ef | 3485 | static void |
12883efb SRRH |
3486 | get_total_entries(struct trace_buffer *buf, |
3487 | unsigned long *total, unsigned long *entries) | |
39eaf7ef SR |
3488 | { |
3489 | unsigned long count; | |
3490 | int cpu; | |
3491 | ||
3492 | *total = 0; | |
3493 | *entries = 0; | |
3494 | ||
3495 | for_each_tracing_cpu(cpu) { | |
12883efb | 3496 | count = ring_buffer_entries_cpu(buf->buffer, cpu); |
39eaf7ef SR |
3497 | /* |
3498 | * If this buffer has skipped entries, then we hold all | |
3499 | * entries for the trace and we need to ignore the | |
3500 | * ones before the time stamp. | |
3501 | */ | |
12883efb SRRH |
3502 | if (per_cpu_ptr(buf->data, cpu)->skipped_entries) { |
3503 | count -= per_cpu_ptr(buf->data, cpu)->skipped_entries; | |
39eaf7ef SR |
3504 | /* total is the same as the entries */ |
3505 | *total += count; | |
3506 | } else | |
3507 | *total += count + | |
12883efb | 3508 | ring_buffer_overrun_cpu(buf->buffer, cpu); |
39eaf7ef SR |
3509 | *entries += count; |
3510 | } | |
3511 | } | |
3512 | ||
e309b41d | 3513 | static void print_lat_help_header(struct seq_file *m) |
bc0c38d1 | 3514 | { |
d79ac28f RV |
3515 | seq_puts(m, "# _------=> CPU# \n" |
3516 | "# / _-----=> irqs-off \n" | |
3517 | "# | / _----=> need-resched \n" | |
3518 | "# || / _---=> hardirq/softirq \n" | |
3519 | "# ||| / _--=> preempt-depth \n" | |
3520 | "# |||| / delay \n" | |
3521 | "# cmd pid ||||| time | caller \n" | |
3522 | "# \\ / ||||| \\ | / \n"); | |
bc0c38d1 SR |
3523 | } |
3524 | ||
12883efb | 3525 | static void print_event_info(struct trace_buffer *buf, struct seq_file *m) |
bc0c38d1 | 3526 | { |
39eaf7ef SR |
3527 | unsigned long total; |
3528 | unsigned long entries; | |
3529 | ||
12883efb | 3530 | get_total_entries(buf, &total, &entries); |
39eaf7ef SR |
3531 | seq_printf(m, "# entries-in-buffer/entries-written: %lu/%lu #P:%d\n", |
3532 | entries, total, num_online_cpus()); | |
3533 | seq_puts(m, "#\n"); | |
3534 | } | |
3535 | ||
441dae8f JF |
3536 | static void print_func_help_header(struct trace_buffer *buf, struct seq_file *m, |
3537 | unsigned int flags) | |
39eaf7ef | 3538 | { |
441dae8f JF |
3539 | bool tgid = flags & TRACE_ITER_RECORD_TGID; |
3540 | ||
12883efb | 3541 | print_event_info(buf, m); |
441dae8f | 3542 | |
f8494fa3 JFG |
3543 | seq_printf(m, "# TASK-PID %s CPU# TIMESTAMP FUNCTION\n", tgid ? "TGID " : ""); |
3544 | seq_printf(m, "# | | %s | | |\n", tgid ? " | " : ""); | |
bc0c38d1 SR |
3545 | } |
3546 | ||
441dae8f JF |
3547 | static void print_func_help_header_irq(struct trace_buffer *buf, struct seq_file *m, |
3548 | unsigned int flags) | |
77271ce4 | 3549 | { |
441dae8f | 3550 | bool tgid = flags & TRACE_ITER_RECORD_TGID; |
b11fb737 SRV |
3551 | const char tgid_space[] = " "; |
3552 | const char space[] = " "; | |
3553 | ||
3554 | seq_printf(m, "# %s _-----=> irqs-off\n", | |
3555 | tgid ? tgid_space : space); | |
3556 | seq_printf(m, "# %s / _----=> need-resched\n", | |
3557 | tgid ? tgid_space : space); | |
3558 | seq_printf(m, "# %s| / _---=> hardirq/softirq\n", | |
3559 | tgid ? tgid_space : space); | |
3560 | seq_printf(m, "# %s|| / _--=> preempt-depth\n", | |
3561 | tgid ? tgid_space : space); | |
3562 | seq_printf(m, "# %s||| / delay\n", | |
3563 | tgid ? tgid_space : space); | |
f8494fa3 | 3564 | seq_printf(m, "# TASK-PID %sCPU# |||| TIMESTAMP FUNCTION\n", |
b11fb737 | 3565 | tgid ? " TGID " : space); |
f8494fa3 | 3566 | seq_printf(m, "# | | %s | |||| | |\n", |
b11fb737 | 3567 | tgid ? " | " : space); |
77271ce4 | 3568 | } |
bc0c38d1 | 3569 | |
62b915f1 | 3570 | void |
bc0c38d1 SR |
3571 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
3572 | { | |
983f938a | 3573 | unsigned long sym_flags = (global_trace.trace_flags & TRACE_ITER_SYM_MASK); |
12883efb SRRH |
3574 | struct trace_buffer *buf = iter->trace_buffer; |
3575 | struct trace_array_cpu *data = per_cpu_ptr(buf->data, buf->cpu); | |
2b6080f2 | 3576 | struct tracer *type = iter->trace; |
39eaf7ef SR |
3577 | unsigned long entries; |
3578 | unsigned long total; | |
bc0c38d1 SR |
3579 | const char *name = "preemption"; |
3580 | ||
d840f718 | 3581 | name = type->name; |
bc0c38d1 | 3582 | |
12883efb | 3583 | get_total_entries(buf, &total, &entries); |
bc0c38d1 | 3584 | |
888b55dc | 3585 | seq_printf(m, "# %s latency trace v1.1.5 on %s\n", |
bc0c38d1 | 3586 | name, UTS_RELEASE); |
888b55dc | 3587 | seq_puts(m, "# -----------------------------------" |
bc0c38d1 | 3588 | "---------------------------------\n"); |
888b55dc | 3589 | seq_printf(m, "# latency: %lu us, #%lu/%lu, CPU#%d |" |
bc0c38d1 | 3590 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", |
57f50be1 | 3591 | nsecs_to_usecs(data->saved_latency), |
bc0c38d1 | 3592 | entries, |
4c11d7ae | 3593 | total, |
12883efb | 3594 | buf->cpu, |
bc0c38d1 SR |
3595 | #if defined(CONFIG_PREEMPT_NONE) |
3596 | "server", | |
3597 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) | |
3598 | "desktop", | |
b5c21b45 | 3599 | #elif defined(CONFIG_PREEMPT) |
bc0c38d1 SR |
3600 | "preempt", |
3601 | #else | |
3602 | "unknown", | |
3603 | #endif | |
3604 | /* These are reserved for later use */ | |
3605 | 0, 0, 0, 0); | |
3606 | #ifdef CONFIG_SMP | |
3607 | seq_printf(m, " #P:%d)\n", num_online_cpus()); | |
3608 | #else | |
3609 | seq_puts(m, ")\n"); | |
3610 | #endif | |
888b55dc KM |
3611 | seq_puts(m, "# -----------------\n"); |
3612 | seq_printf(m, "# | task: %.16s-%d " | |
bc0c38d1 | 3613 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", |
d20b92ab EB |
3614 | data->comm, data->pid, |
3615 | from_kuid_munged(seq_user_ns(m), data->uid), data->nice, | |
bc0c38d1 | 3616 | data->policy, data->rt_priority); |
888b55dc | 3617 | seq_puts(m, "# -----------------\n"); |
bc0c38d1 SR |
3618 | |
3619 | if (data->critical_start) { | |
888b55dc | 3620 | seq_puts(m, "# => started at: "); |
214023c3 SR |
3621 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
3622 | trace_print_seq(m, &iter->seq); | |
888b55dc | 3623 | seq_puts(m, "\n# => ended at: "); |
214023c3 SR |
3624 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
3625 | trace_print_seq(m, &iter->seq); | |
8248ac05 | 3626 | seq_puts(m, "\n#\n"); |
bc0c38d1 SR |
3627 | } |
3628 | ||
888b55dc | 3629 | seq_puts(m, "#\n"); |
bc0c38d1 SR |
3630 | } |
3631 | ||
a309720c SR |
3632 | static void test_cpu_buff_start(struct trace_iterator *iter) |
3633 | { | |
3634 | struct trace_seq *s = &iter->seq; | |
983f938a | 3635 | struct trace_array *tr = iter->tr; |
a309720c | 3636 | |
983f938a | 3637 | if (!(tr->trace_flags & TRACE_ITER_ANNOTATE)) |
12ef7d44 SR |
3638 | return; |
3639 | ||
3640 | if (!(iter->iter_flags & TRACE_FILE_ANNOTATE)) | |
3641 | return; | |
3642 | ||
4dbbe2d8 MK |
3643 | if (cpumask_available(iter->started) && |
3644 | cpumask_test_cpu(iter->cpu, iter->started)) | |
a309720c SR |
3645 | return; |
3646 | ||
12883efb | 3647 | if (per_cpu_ptr(iter->trace_buffer->data, iter->cpu)->skipped_entries) |
2f26ebd5 SR |
3648 | return; |
3649 | ||
4dbbe2d8 | 3650 | if (cpumask_available(iter->started)) |
919cd979 | 3651 | cpumask_set_cpu(iter->cpu, iter->started); |
b0dfa978 FW |
3652 | |
3653 | /* Don't print started cpu buffer for the first entry of the trace */ | |
3654 | if (iter->idx > 1) | |
3655 | trace_seq_printf(s, "##### CPU %u buffer started ####\n", | |
3656 | iter->cpu); | |
a309720c SR |
3657 | } |
3658 | ||
2c4f035f | 3659 | static enum print_line_t print_trace_fmt(struct trace_iterator *iter) |
bc0c38d1 | 3660 | { |
983f938a | 3661 | struct trace_array *tr = iter->tr; |
214023c3 | 3662 | struct trace_seq *s = &iter->seq; |
983f938a | 3663 | unsigned long sym_flags = (tr->trace_flags & TRACE_ITER_SYM_MASK); |
4e3c3333 | 3664 | struct trace_entry *entry; |
f633cef0 | 3665 | struct trace_event *event; |
bc0c38d1 | 3666 | |
4e3c3333 | 3667 | entry = iter->ent; |
dd0e545f | 3668 | |
a309720c SR |
3669 | test_cpu_buff_start(iter); |
3670 | ||
c4a8e8be | 3671 | event = ftrace_find_event(entry->type); |
bc0c38d1 | 3672 | |
983f938a | 3673 | if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) { |
19a7fe20 SRRH |
3674 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) |
3675 | trace_print_lat_context(iter); | |
3676 | else | |
3677 | trace_print_context(iter); | |
c4a8e8be | 3678 | } |
bc0c38d1 | 3679 | |
19a7fe20 SRRH |
3680 | if (trace_seq_has_overflowed(s)) |
3681 | return TRACE_TYPE_PARTIAL_LINE; | |
3682 | ||
268ccda0 | 3683 | if (event) |
a9a57763 | 3684 | return event->funcs->trace(iter, sym_flags, event); |
d9793bd8 | 3685 | |
19a7fe20 | 3686 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
02b67518 | 3687 | |
19a7fe20 | 3688 | return trace_handle_return(s); |
bc0c38d1 SR |
3689 | } |
3690 | ||
2c4f035f | 3691 | static enum print_line_t print_raw_fmt(struct trace_iterator *iter) |
f9896bf3 | 3692 | { |
983f938a | 3693 | struct trace_array *tr = iter->tr; |
f9896bf3 IM |
3694 | struct trace_seq *s = &iter->seq; |
3695 | struct trace_entry *entry; | |
f633cef0 | 3696 | struct trace_event *event; |
f9896bf3 IM |
3697 | |
3698 | entry = iter->ent; | |
dd0e545f | 3699 | |
983f938a | 3700 | if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) |
19a7fe20 SRRH |
3701 | trace_seq_printf(s, "%d %d %llu ", |
3702 | entry->pid, iter->cpu, iter->ts); | |
3703 | ||
3704 | if (trace_seq_has_overflowed(s)) | |
3705 | return TRACE_TYPE_PARTIAL_LINE; | |
f9896bf3 | 3706 | |
f633cef0 | 3707 | event = ftrace_find_event(entry->type); |
268ccda0 | 3708 | if (event) |
a9a57763 | 3709 | return event->funcs->raw(iter, 0, event); |
d9793bd8 | 3710 | |
19a7fe20 | 3711 | trace_seq_printf(s, "%d ?\n", entry->type); |
777e208d | 3712 | |
19a7fe20 | 3713 | return trace_handle_return(s); |
f9896bf3 IM |
3714 | } |
3715 | ||
2c4f035f | 3716 | static enum print_line_t print_hex_fmt(struct trace_iterator *iter) |
5e3ca0ec | 3717 | { |
983f938a | 3718 | struct trace_array *tr = iter->tr; |
5e3ca0ec IM |
3719 | struct trace_seq *s = &iter->seq; |
3720 | unsigned char newline = '\n'; | |
3721 | struct trace_entry *entry; | |
f633cef0 | 3722 | struct trace_event *event; |
5e3ca0ec IM |
3723 | |
3724 | entry = iter->ent; | |
dd0e545f | 3725 | |
983f938a | 3726 | if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) { |
19a7fe20 SRRH |
3727 | SEQ_PUT_HEX_FIELD(s, entry->pid); |
3728 | SEQ_PUT_HEX_FIELD(s, iter->cpu); | |
3729 | SEQ_PUT_HEX_FIELD(s, iter->ts); | |
3730 | if (trace_seq_has_overflowed(s)) | |
3731 | return TRACE_TYPE_PARTIAL_LINE; | |
c4a8e8be | 3732 | } |
5e3ca0ec | 3733 | |
f633cef0 | 3734 | event = ftrace_find_event(entry->type); |
268ccda0 | 3735 | if (event) { |
a9a57763 | 3736 | enum print_line_t ret = event->funcs->hex(iter, 0, event); |
d9793bd8 ACM |
3737 | if (ret != TRACE_TYPE_HANDLED) |
3738 | return ret; | |
3739 | } | |
7104f300 | 3740 | |
19a7fe20 | 3741 | SEQ_PUT_FIELD(s, newline); |
5e3ca0ec | 3742 | |
19a7fe20 | 3743 | return trace_handle_return(s); |
5e3ca0ec IM |
3744 | } |
3745 | ||
2c4f035f | 3746 | static enum print_line_t print_bin_fmt(struct trace_iterator *iter) |
cb0f12aa | 3747 | { |
983f938a | 3748 | struct trace_array *tr = iter->tr; |
cb0f12aa IM |
3749 | struct trace_seq *s = &iter->seq; |
3750 | struct trace_entry *entry; | |
f633cef0 | 3751 | struct trace_event *event; |
cb0f12aa IM |
3752 | |
3753 | entry = iter->ent; | |
dd0e545f | 3754 | |
983f938a | 3755 | if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) { |
19a7fe20 SRRH |
3756 | SEQ_PUT_FIELD(s, entry->pid); |
3757 | SEQ_PUT_FIELD(s, iter->cpu); | |
3758 | SEQ_PUT_FIELD(s, iter->ts); | |
3759 | if (trace_seq_has_overflowed(s)) | |
3760 | return TRACE_TYPE_PARTIAL_LINE; | |
c4a8e8be | 3761 | } |
cb0f12aa | 3762 | |
f633cef0 | 3763 | event = ftrace_find_event(entry->type); |
a9a57763 SR |
3764 | return event ? event->funcs->binary(iter, 0, event) : |
3765 | TRACE_TYPE_HANDLED; | |
cb0f12aa IM |
3766 | } |
3767 | ||
62b915f1 | 3768 | int trace_empty(struct trace_iterator *iter) |
bc0c38d1 | 3769 | { |
6d158a81 | 3770 | struct ring_buffer_iter *buf_iter; |
bc0c38d1 SR |
3771 | int cpu; |
3772 | ||
9aba60fe | 3773 | /* If we are looking at one CPU buffer, only check that one */ |
ae3b5093 | 3774 | if (iter->cpu_file != RING_BUFFER_ALL_CPUS) { |
9aba60fe | 3775 | cpu = iter->cpu_file; |
6d158a81 SR |
3776 | buf_iter = trace_buffer_iter(iter, cpu); |
3777 | if (buf_iter) { | |
3778 | if (!ring_buffer_iter_empty(buf_iter)) | |
9aba60fe SR |
3779 | return 0; |
3780 | } else { | |
12883efb | 3781 | if (!ring_buffer_empty_cpu(iter->trace_buffer->buffer, cpu)) |
9aba60fe SR |
3782 | return 0; |
3783 | } | |
3784 | return 1; | |
3785 | } | |
3786 | ||
ab46428c | 3787 | for_each_tracing_cpu(cpu) { |
6d158a81 SR |
3788 | buf_iter = trace_buffer_iter(iter, cpu); |
3789 | if (buf_iter) { | |
3790 | if (!ring_buffer_iter_empty(buf_iter)) | |
d769041f SR |
3791 | return 0; |
3792 | } else { | |
12883efb | 3793 | if (!ring_buffer_empty_cpu(iter->trace_buffer->buffer, cpu)) |
d769041f SR |
3794 | return 0; |
3795 | } | |
bc0c38d1 | 3796 | } |
d769041f | 3797 | |
797d3712 | 3798 | return 1; |
bc0c38d1 SR |
3799 | } |
3800 | ||
4f535968 | 3801 | /* Called with trace_event_read_lock() held. */ |
955b61e5 | 3802 | enum print_line_t print_trace_line(struct trace_iterator *iter) |
f9896bf3 | 3803 | { |
983f938a SRRH |
3804 | struct trace_array *tr = iter->tr; |
3805 | unsigned long trace_flags = tr->trace_flags; | |
2c4f035f FW |
3806 | enum print_line_t ret; |
3807 | ||
19a7fe20 SRRH |
3808 | if (iter->lost_events) { |
3809 | trace_seq_printf(&iter->seq, "CPU:%d [LOST %lu EVENTS]\n", | |
3810 | iter->cpu, iter->lost_events); | |
3811 | if (trace_seq_has_overflowed(&iter->seq)) | |
3812 | return TRACE_TYPE_PARTIAL_LINE; | |
3813 | } | |
bc21b478 | 3814 | |
2c4f035f FW |
3815 | if (iter->trace && iter->trace->print_line) { |
3816 | ret = iter->trace->print_line(iter); | |
3817 | if (ret != TRACE_TYPE_UNHANDLED) | |
3818 | return ret; | |
3819 | } | |
72829bc3 | 3820 | |
09ae7234 SRRH |
3821 | if (iter->ent->type == TRACE_BPUTS && |
3822 | trace_flags & TRACE_ITER_PRINTK && | |
3823 | trace_flags & TRACE_ITER_PRINTK_MSGONLY) | |
3824 | return trace_print_bputs_msg_only(iter); | |
3825 | ||
48ead020 FW |
3826 | if (iter->ent->type == TRACE_BPRINT && |
3827 | trace_flags & TRACE_ITER_PRINTK && | |
3828 | trace_flags & TRACE_ITER_PRINTK_MSGONLY) | |
5ef841f6 | 3829 | return trace_print_bprintk_msg_only(iter); |
48ead020 | 3830 | |
66896a85 FW |
3831 | if (iter->ent->type == TRACE_PRINT && |
3832 | trace_flags & TRACE_ITER_PRINTK && | |
3833 | trace_flags & TRACE_ITER_PRINTK_MSGONLY) | |
5ef841f6 | 3834 | return trace_print_printk_msg_only(iter); |
66896a85 | 3835 | |
cb0f12aa IM |
3836 | if (trace_flags & TRACE_ITER_BIN) |
3837 | return print_bin_fmt(iter); | |
3838 | ||
5e3ca0ec IM |
3839 | if (trace_flags & TRACE_ITER_HEX) |
3840 | return print_hex_fmt(iter); | |
3841 | ||
f9896bf3 IM |
3842 | if (trace_flags & TRACE_ITER_RAW) |
3843 | return print_raw_fmt(iter); | |
3844 | ||
f9896bf3 IM |
3845 | return print_trace_fmt(iter); |
3846 | } | |
3847 | ||
7e9a49ef JO |
3848 | void trace_latency_header(struct seq_file *m) |
3849 | { | |
3850 | struct trace_iterator *iter = m->private; | |
983f938a | 3851 | struct trace_array *tr = iter->tr; |
7e9a49ef JO |
3852 | |
3853 | /* print nothing if the buffers are empty */ | |
3854 | if (trace_empty(iter)) | |
3855 | return; | |
3856 | ||
3857 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) | |
3858 | print_trace_header(m, iter); | |
3859 | ||
983f938a | 3860 | if (!(tr->trace_flags & TRACE_ITER_VERBOSE)) |
7e9a49ef JO |
3861 | print_lat_help_header(m); |
3862 | } | |
3863 | ||
62b915f1 JO |
3864 | void trace_default_header(struct seq_file *m) |
3865 | { | |
3866 | struct trace_iterator *iter = m->private; | |
983f938a SRRH |
3867 | struct trace_array *tr = iter->tr; |
3868 | unsigned long trace_flags = tr->trace_flags; | |
62b915f1 | 3869 | |
f56e7f8e JO |
3870 | if (!(trace_flags & TRACE_ITER_CONTEXT_INFO)) |
3871 | return; | |
3872 | ||
62b915f1 JO |
3873 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { |
3874 | /* print nothing if the buffers are empty */ | |
3875 | if (trace_empty(iter)) | |
3876 | return; | |
3877 | print_trace_header(m, iter); | |
3878 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
3879 | print_lat_help_header(m); | |
3880 | } else { | |
77271ce4 SR |
3881 | if (!(trace_flags & TRACE_ITER_VERBOSE)) { |
3882 | if (trace_flags & TRACE_ITER_IRQ_INFO) | |
441dae8f JF |
3883 | print_func_help_header_irq(iter->trace_buffer, |
3884 | m, trace_flags); | |
77271ce4 | 3885 | else |
441dae8f JF |
3886 | print_func_help_header(iter->trace_buffer, m, |
3887 | trace_flags); | |
77271ce4 | 3888 | } |
62b915f1 JO |
3889 | } |
3890 | } | |
3891 | ||
e0a413f6 SR |
3892 | static void test_ftrace_alive(struct seq_file *m) |
3893 | { | |
3894 | if (!ftrace_is_dead()) | |
3895 | return; | |
d79ac28f RV |
3896 | seq_puts(m, "# WARNING: FUNCTION TRACING IS CORRUPTED\n" |
3897 | "# MAY BE MISSING FUNCTION EVENTS\n"); | |
e0a413f6 SR |
3898 | } |
3899 | ||
d8741e2e | 3900 | #ifdef CONFIG_TRACER_MAX_TRACE |
f1affcaa | 3901 | static void show_snapshot_main_help(struct seq_file *m) |
d8741e2e | 3902 | { |
d79ac28f RV |
3903 | seq_puts(m, "# echo 0 > snapshot : Clears and frees snapshot buffer\n" |
3904 | "# echo 1 > snapshot : Allocates snapshot buffer, if not already allocated.\n" | |
3905 | "# Takes a snapshot of the main buffer.\n" | |
3906 | "# echo 2 > snapshot : Clears snapshot buffer (but does not allocate or free)\n" | |
3907 | "# (Doesn't have to be '2' works with any number that\n" | |
3908 | "# is not a '0' or '1')\n"); | |
d8741e2e | 3909 | } |
f1affcaa SRRH |
3910 | |
3911 | static void show_snapshot_percpu_help(struct seq_file *m) | |
3912 | { | |
fa6f0cc7 | 3913 | seq_puts(m, "# echo 0 > snapshot : Invalid for per_cpu snapshot file.\n"); |
f1affcaa | 3914 | #ifdef CONFIG_RING_BUFFER_ALLOW_SWAP |
d79ac28f RV |
3915 | seq_puts(m, "# echo 1 > snapshot : Allocates snapshot buffer, if not already allocated.\n" |
3916 | "# Takes a snapshot of the main buffer for this cpu.\n"); | |
f1affcaa | 3917 | #else |
d79ac28f RV |
3918 | seq_puts(m, "# echo 1 > snapshot : Not supported with this kernel.\n" |
3919 | "# Must use main snapshot file to allocate.\n"); | |
f1affcaa | 3920 | #endif |
d79ac28f RV |
3921 | seq_puts(m, "# echo 2 > snapshot : Clears this cpu's snapshot buffer (but does not allocate)\n" |
3922 | "# (Doesn't have to be '2' works with any number that\n" | |
3923 | "# is not a '0' or '1')\n"); | |
f1affcaa SRRH |
3924 | } |
3925 | ||
d8741e2e SRRH |
3926 | static void print_snapshot_help(struct seq_file *m, struct trace_iterator *iter) |
3927 | { | |
45ad21ca | 3928 | if (iter->tr->allocated_snapshot) |
fa6f0cc7 | 3929 | seq_puts(m, "#\n# * Snapshot is allocated *\n#\n"); |
d8741e2e | 3930 | else |
fa6f0cc7 | 3931 | seq_puts(m, "#\n# * Snapshot is freed *\n#\n"); |
d8741e2e | 3932 | |
fa6f0cc7 | 3933 | seq_puts(m, "# Snapshot commands:\n"); |
f1affcaa SRRH |
3934 | if (iter->cpu_file == RING_BUFFER_ALL_CPUS) |
3935 | show_snapshot_main_help(m); | |
3936 | else | |
3937 | show_snapshot_percpu_help(m); | |
d8741e2e SRRH |
3938 | } |
3939 | #else | |
3940 | /* Should never be called */ | |
3941 | static inline void print_snapshot_help(struct seq_file *m, struct trace_iterator *iter) { } | |
3942 | #endif | |
3943 | ||
bc0c38d1 SR |
3944 | static int s_show(struct seq_file *m, void *v) |
3945 | { | |
3946 | struct trace_iterator *iter = v; | |
a63ce5b3 | 3947 | int ret; |
bc0c38d1 SR |
3948 | |
3949 | if (iter->ent == NULL) { | |
3950 | if (iter->tr) { | |
3951 | seq_printf(m, "# tracer: %s\n", iter->trace->name); | |
3952 | seq_puts(m, "#\n"); | |
e0a413f6 | 3953 | test_ftrace_alive(m); |
bc0c38d1 | 3954 | } |
d8741e2e SRRH |
3955 | if (iter->snapshot && trace_empty(iter)) |
3956 | print_snapshot_help(m, iter); | |
3957 | else if (iter->trace && iter->trace->print_header) | |
8bba1bf5 | 3958 | iter->trace->print_header(m); |
62b915f1 JO |
3959 | else |
3960 | trace_default_header(m); | |
3961 | ||
a63ce5b3 SR |
3962 | } else if (iter->leftover) { |
3963 | /* | |
3964 | * If we filled the seq_file buffer earlier, we | |
3965 | * want to just show it now. | |
3966 | */ | |
3967 | ret = trace_print_seq(m, &iter->seq); | |
3968 | ||
3969 | /* ret should this time be zero, but you never know */ | |
3970 | iter->leftover = ret; | |
3971 | ||
bc0c38d1 | 3972 | } else { |
f9896bf3 | 3973 | print_trace_line(iter); |
a63ce5b3 SR |
3974 | ret = trace_print_seq(m, &iter->seq); |
3975 | /* | |
3976 | * If we overflow the seq_file buffer, then it will | |
3977 | * ask us for this data again at start up. | |
3978 | * Use that instead. | |
3979 | * ret is 0 if seq_file write succeeded. | |
3980 | * -1 otherwise. | |
3981 | */ | |
3982 | iter->leftover = ret; | |
bc0c38d1 SR |
3983 | } |
3984 | ||
3985 | return 0; | |
3986 | } | |
3987 | ||
649e9c70 ON |
3988 | /* |
3989 | * Should be used after trace_array_get(), trace_types_lock | |
3990 | * ensures that i_cdev was already initialized. | |
3991 | */ | |
3992 | static inline int tracing_get_cpu(struct inode *inode) | |
3993 | { | |
3994 | if (inode->i_cdev) /* See trace_create_cpu_file() */ | |
3995 | return (long)inode->i_cdev - 1; | |
3996 | return RING_BUFFER_ALL_CPUS; | |
3997 | } | |
3998 | ||
88e9d34c | 3999 | static const struct seq_operations tracer_seq_ops = { |
4bf39a94 IM |
4000 | .start = s_start, |
4001 | .next = s_next, | |
4002 | .stop = s_stop, | |
4003 | .show = s_show, | |
bc0c38d1 SR |
4004 | }; |
4005 | ||
e309b41d | 4006 | static struct trace_iterator * |
6484c71c | 4007 | __tracing_open(struct inode *inode, struct file *file, bool snapshot) |
bc0c38d1 | 4008 | { |
6484c71c | 4009 | struct trace_array *tr = inode->i_private; |
bc0c38d1 | 4010 | struct trace_iterator *iter; |
50e18b94 | 4011 | int cpu; |
bc0c38d1 | 4012 | |
85a2f9b4 SR |
4013 | if (tracing_disabled) |
4014 | return ERR_PTR(-ENODEV); | |
60a11774 | 4015 | |
50e18b94 | 4016 | iter = __seq_open_private(file, &tracer_seq_ops, sizeof(*iter)); |
85a2f9b4 SR |
4017 | if (!iter) |
4018 | return ERR_PTR(-ENOMEM); | |
bc0c38d1 | 4019 | |
72917235 | 4020 | iter->buffer_iter = kcalloc(nr_cpu_ids, sizeof(*iter->buffer_iter), |
6d158a81 | 4021 | GFP_KERNEL); |
93574fcc DC |
4022 | if (!iter->buffer_iter) |
4023 | goto release; | |
4024 | ||
d7350c3f FW |
4025 | /* |
4026 | * We make a copy of the current tracer to avoid concurrent | |
4027 | * changes on it while we are reading. | |
4028 | */ | |
bc0c38d1 | 4029 | mutex_lock(&trace_types_lock); |
d7350c3f | 4030 | iter->trace = kzalloc(sizeof(*iter->trace), GFP_KERNEL); |
85a2f9b4 | 4031 | if (!iter->trace) |
d7350c3f | 4032 | goto fail; |
85a2f9b4 | 4033 | |
2b6080f2 | 4034 | *iter->trace = *tr->current_trace; |
d7350c3f | 4035 | |
79f55997 | 4036 | if (!zalloc_cpumask_var(&iter->started, GFP_KERNEL)) |
b0dfa978 FW |
4037 | goto fail; |
4038 | ||
12883efb SRRH |
4039 | iter->tr = tr; |
4040 | ||
4041 | #ifdef CONFIG_TRACER_MAX_TRACE | |
2b6080f2 SR |
4042 | /* Currently only the top directory has a snapshot */ |
4043 | if (tr->current_trace->print_max || snapshot) | |
12883efb | 4044 | iter->trace_buffer = &tr->max_buffer; |
bc0c38d1 | 4045 | else |
12883efb SRRH |
4046 | #endif |
4047 | iter->trace_buffer = &tr->trace_buffer; | |
debdd57f | 4048 | iter->snapshot = snapshot; |
bc0c38d1 | 4049 | iter->pos = -1; |
6484c71c | 4050 | iter->cpu_file = tracing_get_cpu(inode); |
d7350c3f | 4051 | mutex_init(&iter->mutex); |
bc0c38d1 | 4052 | |
8bba1bf5 MM |
4053 | /* Notify the tracer early; before we stop tracing. */ |
4054 | if (iter->trace && iter->trace->open) | |
a93751ca | 4055 | iter->trace->open(iter); |
8bba1bf5 | 4056 | |
12ef7d44 | 4057 | /* Annotate start of buffers if we had overruns */ |
12883efb | 4058 | if (ring_buffer_overruns(iter->trace_buffer->buffer)) |
12ef7d44 SR |
4059 | iter->iter_flags |= TRACE_FILE_ANNOTATE; |
4060 | ||
8be0709f | 4061 | /* Output in nanoseconds only if we are using a clock in nanoseconds. */ |
58e8eedf | 4062 | if (trace_clocks[tr->clock_id].in_ns) |
8be0709f DS |
4063 | iter->iter_flags |= TRACE_FILE_TIME_IN_NS; |
4064 | ||
debdd57f HT |
4065 | /* stop the trace while dumping if we are not opening "snapshot" */ |
4066 | if (!iter->snapshot) | |
2b6080f2 | 4067 | tracing_stop_tr(tr); |
2f26ebd5 | 4068 | |
ae3b5093 | 4069 | if (iter->cpu_file == RING_BUFFER_ALL_CPUS) { |
b04cc6b1 | 4070 | for_each_tracing_cpu(cpu) { |
b04cc6b1 | 4071 | iter->buffer_iter[cpu] = |
12883efb | 4072 | ring_buffer_read_prepare(iter->trace_buffer->buffer, cpu); |
72c9ddfd DM |
4073 | } |
4074 | ring_buffer_read_prepare_sync(); | |
4075 | for_each_tracing_cpu(cpu) { | |
4076 | ring_buffer_read_start(iter->buffer_iter[cpu]); | |
2f26ebd5 | 4077 | tracing_iter_reset(iter, cpu); |
b04cc6b1 FW |
4078 | } |
4079 | } else { | |
4080 | cpu = iter->cpu_file; | |
3928a8a2 | 4081 | iter->buffer_iter[cpu] = |
12883efb | 4082 | ring_buffer_read_prepare(iter->trace_buffer->buffer, cpu); |
72c9ddfd DM |
4083 | ring_buffer_read_prepare_sync(); |
4084 | ring_buffer_read_start(iter->buffer_iter[cpu]); | |
2f26ebd5 | 4085 | tracing_iter_reset(iter, cpu); |
3928a8a2 SR |
4086 | } |
4087 | ||
bc0c38d1 SR |
4088 | mutex_unlock(&trace_types_lock); |
4089 | ||
bc0c38d1 | 4090 | return iter; |
3928a8a2 | 4091 | |
d7350c3f | 4092 | fail: |
3928a8a2 | 4093 | mutex_unlock(&trace_types_lock); |
d7350c3f | 4094 | kfree(iter->trace); |
6d158a81 | 4095 | kfree(iter->buffer_iter); |
93574fcc | 4096 | release: |
50e18b94 JO |
4097 | seq_release_private(inode, file); |
4098 | return ERR_PTR(-ENOMEM); | |
bc0c38d1 SR |
4099 | } |
4100 | ||
4101 | int tracing_open_generic(struct inode *inode, struct file *filp) | |
4102 | { | |
60a11774 SR |
4103 | if (tracing_disabled) |
4104 | return -ENODEV; | |
4105 | ||
bc0c38d1 SR |
4106 | filp->private_data = inode->i_private; |
4107 | return 0; | |
4108 | } | |
4109 | ||
2e86421d GB |
4110 | bool tracing_is_disabled(void) |
4111 | { | |
4112 | return (tracing_disabled) ? true: false; | |
4113 | } | |
4114 | ||
7b85af63 SRRH |
4115 | /* |
4116 | * Open and update trace_array ref count. | |
4117 | * Must have the current trace_array passed to it. | |
4118 | */ | |
dcc30223 | 4119 | static int tracing_open_generic_tr(struct inode *inode, struct file *filp) |
7b85af63 SRRH |
4120 | { |
4121 | struct trace_array *tr = inode->i_private; | |
4122 | ||
4123 | if (tracing_disabled) | |
4124 | return -ENODEV; | |
4125 | ||
4126 | if (trace_array_get(tr) < 0) | |
4127 | return -ENODEV; | |
4128 | ||
4129 | filp->private_data = inode->i_private; | |
4130 | ||
4131 | return 0; | |
7b85af63 SRRH |
4132 | } |
4133 | ||
4fd27358 | 4134 | static int tracing_release(struct inode *inode, struct file *file) |
bc0c38d1 | 4135 | { |
6484c71c | 4136 | struct trace_array *tr = inode->i_private; |
907f2784 | 4137 | struct seq_file *m = file->private_data; |
4acd4d00 | 4138 | struct trace_iterator *iter; |
3928a8a2 | 4139 | int cpu; |
bc0c38d1 | 4140 | |
ff451961 | 4141 | if (!(file->f_mode & FMODE_READ)) { |
6484c71c | 4142 | trace_array_put(tr); |
4acd4d00 | 4143 | return 0; |
ff451961 | 4144 | } |
4acd4d00 | 4145 | |
6484c71c | 4146 | /* Writes do not use seq_file */ |
4acd4d00 | 4147 | iter = m->private; |
bc0c38d1 | 4148 | mutex_lock(&trace_types_lock); |
a695cb58 | 4149 | |
3928a8a2 SR |
4150 | for_each_tracing_cpu(cpu) { |
4151 | if (iter->buffer_iter[cpu]) | |
4152 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
4153 | } | |
4154 | ||
bc0c38d1 SR |
4155 | if (iter->trace && iter->trace->close) |
4156 | iter->trace->close(iter); | |
4157 | ||
debdd57f HT |
4158 | if (!iter->snapshot) |
4159 | /* reenable tracing if it was previously enabled */ | |
2b6080f2 | 4160 | tracing_start_tr(tr); |
f77d09a3 AL |
4161 | |
4162 | __trace_array_put(tr); | |
4163 | ||
bc0c38d1 SR |
4164 | mutex_unlock(&trace_types_lock); |
4165 | ||
d7350c3f | 4166 | mutex_destroy(&iter->mutex); |
b0dfa978 | 4167 | free_cpumask_var(iter->started); |
d7350c3f | 4168 | kfree(iter->trace); |
6d158a81 | 4169 | kfree(iter->buffer_iter); |
50e18b94 | 4170 | seq_release_private(inode, file); |
ff451961 | 4171 | |
bc0c38d1 SR |
4172 | return 0; |
4173 | } | |
4174 | ||
7b85af63 SRRH |
4175 | static int tracing_release_generic_tr(struct inode *inode, struct file *file) |
4176 | { | |
4177 | struct trace_array *tr = inode->i_private; | |
4178 | ||
4179 | trace_array_put(tr); | |
bc0c38d1 SR |
4180 | return 0; |
4181 | } | |
4182 | ||
7b85af63 SRRH |
4183 | static int tracing_single_release_tr(struct inode *inode, struct file *file) |
4184 | { | |
4185 | struct trace_array *tr = inode->i_private; | |
4186 | ||
4187 | trace_array_put(tr); | |
4188 | ||
4189 | return single_release(inode, file); | |
4190 | } | |
4191 | ||
bc0c38d1 SR |
4192 | static int tracing_open(struct inode *inode, struct file *file) |
4193 | { | |
6484c71c | 4194 | struct trace_array *tr = inode->i_private; |
85a2f9b4 SR |
4195 | struct trace_iterator *iter; |
4196 | int ret = 0; | |
bc0c38d1 | 4197 | |
ff451961 SRRH |
4198 | if (trace_array_get(tr) < 0) |
4199 | return -ENODEV; | |
4200 | ||
4acd4d00 | 4201 | /* If this file was open for write, then erase contents */ |
6484c71c ON |
4202 | if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) { |
4203 | int cpu = tracing_get_cpu(inode); | |
8dd33bcb BY |
4204 | struct trace_buffer *trace_buf = &tr->trace_buffer; |
4205 | ||
4206 | #ifdef CONFIG_TRACER_MAX_TRACE | |
4207 | if (tr->current_trace->print_max) | |
4208 | trace_buf = &tr->max_buffer; | |
4209 | #endif | |
6484c71c ON |
4210 | |
4211 | if (cpu == RING_BUFFER_ALL_CPUS) | |
8dd33bcb | 4212 | tracing_reset_online_cpus(trace_buf); |
4acd4d00 | 4213 | else |
8dd33bcb | 4214 | tracing_reset(trace_buf, cpu); |
4acd4d00 | 4215 | } |
bc0c38d1 | 4216 | |
4acd4d00 | 4217 | if (file->f_mode & FMODE_READ) { |
6484c71c | 4218 | iter = __tracing_open(inode, file, false); |
4acd4d00 SR |
4219 | if (IS_ERR(iter)) |
4220 | ret = PTR_ERR(iter); | |
983f938a | 4221 | else if (tr->trace_flags & TRACE_ITER_LATENCY_FMT) |
4acd4d00 SR |
4222 | iter->iter_flags |= TRACE_FILE_LAT_FMT; |
4223 | } | |
ff451961 SRRH |
4224 | |
4225 | if (ret < 0) | |
4226 | trace_array_put(tr); | |
4227 | ||
bc0c38d1 SR |
4228 | return ret; |
4229 | } | |
4230 | ||
607e2ea1 SRRH |
4231 | /* |
4232 | * Some tracers are not suitable for instance buffers. | |
4233 | * A tracer is always available for the global array (toplevel) | |
4234 | * or if it explicitly states that it is. | |
4235 | */ | |
4236 | static bool | |
4237 | trace_ok_for_array(struct tracer *t, struct trace_array *tr) | |
4238 | { | |
4239 | return (tr->flags & TRACE_ARRAY_FL_GLOBAL) || t->allow_instances; | |
4240 | } | |
4241 | ||
4242 | /* Find the next tracer that this trace array may use */ | |
4243 | static struct tracer * | |
4244 | get_tracer_for_array(struct trace_array *tr, struct tracer *t) | |
4245 | { | |
4246 | while (t && !trace_ok_for_array(t, tr)) | |
4247 | t = t->next; | |
4248 | ||
4249 | return t; | |
4250 | } | |
4251 | ||
e309b41d | 4252 | static void * |
bc0c38d1 SR |
4253 | t_next(struct seq_file *m, void *v, loff_t *pos) |
4254 | { | |
607e2ea1 | 4255 | struct trace_array *tr = m->private; |
f129e965 | 4256 | struct tracer *t = v; |
bc0c38d1 SR |
4257 | |
4258 | (*pos)++; | |
4259 | ||
4260 | if (t) | |
607e2ea1 | 4261 | t = get_tracer_for_array(tr, t->next); |
bc0c38d1 | 4262 | |
bc0c38d1 SR |
4263 | return t; |
4264 | } | |
4265 | ||
4266 | static void *t_start(struct seq_file *m, loff_t *pos) | |
4267 | { | |
607e2ea1 | 4268 | struct trace_array *tr = m->private; |
f129e965 | 4269 | struct tracer *t; |
bc0c38d1 SR |
4270 | loff_t l = 0; |
4271 | ||
4272 | mutex_lock(&trace_types_lock); | |
607e2ea1 SRRH |
4273 | |
4274 | t = get_tracer_for_array(tr, trace_types); | |
4275 | for (; t && l < *pos; t = t_next(m, t, &l)) | |
4276 | ; | |
bc0c38d1 SR |
4277 | |
4278 | return t; | |
4279 | } | |
4280 | ||
4281 | static void t_stop(struct seq_file *m, void *p) | |
4282 | { | |
4283 | mutex_unlock(&trace_types_lock); | |
4284 | } | |
4285 | ||
4286 | static int t_show(struct seq_file *m, void *v) | |
4287 | { | |
4288 | struct tracer *t = v; | |
4289 | ||
4290 | if (!t) | |
4291 | return 0; | |
4292 | ||
fa6f0cc7 | 4293 | seq_puts(m, t->name); |
bc0c38d1 SR |
4294 | if (t->next) |
4295 | seq_putc(m, ' '); | |
4296 | else | |
4297 | seq_putc(m, '\n'); | |
4298 | ||
4299 | return 0; | |
4300 | } | |
4301 | ||
88e9d34c | 4302 | static const struct seq_operations show_traces_seq_ops = { |
4bf39a94 IM |
4303 | .start = t_start, |
4304 | .next = t_next, | |
4305 | .stop = t_stop, | |
4306 | .show = t_show, | |
bc0c38d1 SR |
4307 | }; |
4308 | ||
4309 | static int show_traces_open(struct inode *inode, struct file *file) | |
4310 | { | |
607e2ea1 SRRH |
4311 | struct trace_array *tr = inode->i_private; |
4312 | struct seq_file *m; | |
4313 | int ret; | |
4314 | ||
60a11774 SR |
4315 | if (tracing_disabled) |
4316 | return -ENODEV; | |
4317 | ||
607e2ea1 SRRH |
4318 | ret = seq_open(file, &show_traces_seq_ops); |
4319 | if (ret) | |
4320 | return ret; | |
4321 | ||
4322 | m = file->private_data; | |
4323 | m->private = tr; | |
4324 | ||
4325 | return 0; | |
bc0c38d1 SR |
4326 | } |
4327 | ||
4acd4d00 SR |
4328 | static ssize_t |
4329 | tracing_write_stub(struct file *filp, const char __user *ubuf, | |
4330 | size_t count, loff_t *ppos) | |
4331 | { | |
4332 | return count; | |
4333 | } | |
4334 | ||
098c879e | 4335 | loff_t tracing_lseek(struct file *file, loff_t offset, int whence) |
364829b1 | 4336 | { |
098c879e SRRH |
4337 | int ret; |
4338 | ||
364829b1 | 4339 | if (file->f_mode & FMODE_READ) |
098c879e | 4340 | ret = seq_lseek(file, offset, whence); |
364829b1 | 4341 | else |
098c879e SRRH |
4342 | file->f_pos = ret = 0; |
4343 | ||
4344 | return ret; | |
364829b1 SP |
4345 | } |
4346 | ||
5e2336a0 | 4347 | static const struct file_operations tracing_fops = { |
4bf39a94 IM |
4348 | .open = tracing_open, |
4349 | .read = seq_read, | |
4acd4d00 | 4350 | .write = tracing_write_stub, |
098c879e | 4351 | .llseek = tracing_lseek, |
4bf39a94 | 4352 | .release = tracing_release, |
bc0c38d1 SR |
4353 | }; |
4354 | ||
5e2336a0 | 4355 | static const struct file_operations show_traces_fops = { |
c7078de1 IM |
4356 | .open = show_traces_open, |
4357 | .read = seq_read, | |
4358 | .release = seq_release, | |
b444786f | 4359 | .llseek = seq_lseek, |
c7078de1 IM |
4360 | }; |
4361 | ||
4362 | static ssize_t | |
4363 | tracing_cpumask_read(struct file *filp, char __user *ubuf, | |
4364 | size_t count, loff_t *ppos) | |
4365 | { | |
ccfe9e42 | 4366 | struct trace_array *tr = file_inode(filp)->i_private; |
90e406f9 | 4367 | char *mask_str; |
36dfe925 | 4368 | int len; |
c7078de1 | 4369 | |
90e406f9 CD |
4370 | len = snprintf(NULL, 0, "%*pb\n", |
4371 | cpumask_pr_args(tr->tracing_cpumask)) + 1; | |
4372 | mask_str = kmalloc(len, GFP_KERNEL); | |
4373 | if (!mask_str) | |
4374 | return -ENOMEM; | |
36dfe925 | 4375 | |
90e406f9 | 4376 | len = snprintf(mask_str, len, "%*pb\n", |
1a40243b TH |
4377 | cpumask_pr_args(tr->tracing_cpumask)); |
4378 | if (len >= count) { | |
36dfe925 IM |
4379 | count = -EINVAL; |
4380 | goto out_err; | |
4381 | } | |
90e406f9 | 4382 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, len); |
36dfe925 IM |
4383 | |
4384 | out_err: | |
90e406f9 | 4385 | kfree(mask_str); |
c7078de1 IM |
4386 | |
4387 | return count; | |
4388 | } | |
4389 | ||
4390 | static ssize_t | |
4391 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, | |
4392 | size_t count, loff_t *ppos) | |
4393 | { | |
ccfe9e42 | 4394 | struct trace_array *tr = file_inode(filp)->i_private; |
9e01c1b7 | 4395 | cpumask_var_t tracing_cpumask_new; |
2b6080f2 | 4396 | int err, cpu; |
9e01c1b7 RR |
4397 | |
4398 | if (!alloc_cpumask_var(&tracing_cpumask_new, GFP_KERNEL)) | |
4399 | return -ENOMEM; | |
c7078de1 | 4400 | |
9e01c1b7 | 4401 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); |
c7078de1 | 4402 | if (err) |
36dfe925 IM |
4403 | goto err_unlock; |
4404 | ||
a5e25883 | 4405 | local_irq_disable(); |
0b9b12c1 | 4406 | arch_spin_lock(&tr->max_lock); |
ab46428c | 4407 | for_each_tracing_cpu(cpu) { |
36dfe925 IM |
4408 | /* |
4409 | * Increase/decrease the disabled counter if we are | |
4410 | * about to flip a bit in the cpumask: | |
4411 | */ | |
ccfe9e42 | 4412 | if (cpumask_test_cpu(cpu, tr->tracing_cpumask) && |
9e01c1b7 | 4413 | !cpumask_test_cpu(cpu, tracing_cpumask_new)) { |
12883efb SRRH |
4414 | atomic_inc(&per_cpu_ptr(tr->trace_buffer.data, cpu)->disabled); |
4415 | ring_buffer_record_disable_cpu(tr->trace_buffer.buffer, cpu); | |
36dfe925 | 4416 | } |
ccfe9e42 | 4417 | if (!cpumask_test_cpu(cpu, tr->tracing_cpumask) && |
9e01c1b7 | 4418 | cpumask_test_cpu(cpu, tracing_cpumask_new)) { |
12883efb SRRH |
4419 | atomic_dec(&per_cpu_ptr(tr->trace_buffer.data, cpu)->disabled); |
4420 | ring_buffer_record_enable_cpu(tr->trace_buffer.buffer, cpu); | |
36dfe925 IM |
4421 | } |
4422 | } | |
0b9b12c1 | 4423 | arch_spin_unlock(&tr->max_lock); |
a5e25883 | 4424 | local_irq_enable(); |
36dfe925 | 4425 | |
ccfe9e42 | 4426 | cpumask_copy(tr->tracing_cpumask, tracing_cpumask_new); |
9e01c1b7 | 4427 | free_cpumask_var(tracing_cpumask_new); |
c7078de1 IM |
4428 | |
4429 | return count; | |
36dfe925 IM |
4430 | |
4431 | err_unlock: | |
215368e8 | 4432 | free_cpumask_var(tracing_cpumask_new); |
36dfe925 IM |
4433 | |
4434 | return err; | |
c7078de1 IM |
4435 | } |
4436 | ||
5e2336a0 | 4437 | static const struct file_operations tracing_cpumask_fops = { |
ccfe9e42 | 4438 | .open = tracing_open_generic_tr, |
c7078de1 IM |
4439 | .read = tracing_cpumask_read, |
4440 | .write = tracing_cpumask_write, | |
ccfe9e42 | 4441 | .release = tracing_release_generic_tr, |
b444786f | 4442 | .llseek = generic_file_llseek, |
bc0c38d1 SR |
4443 | }; |
4444 | ||
fdb372ed | 4445 | static int tracing_trace_options_show(struct seq_file *m, void *v) |
bc0c38d1 | 4446 | { |
d8e83d26 | 4447 | struct tracer_opt *trace_opts; |
2b6080f2 | 4448 | struct trace_array *tr = m->private; |
d8e83d26 | 4449 | u32 tracer_flags; |
d8e83d26 | 4450 | int i; |
adf9f195 | 4451 | |
d8e83d26 | 4452 | mutex_lock(&trace_types_lock); |
2b6080f2 SR |
4453 | tracer_flags = tr->current_trace->flags->val; |
4454 | trace_opts = tr->current_trace->flags->opts; | |
d8e83d26 | 4455 | |
bc0c38d1 | 4456 | for (i = 0; trace_options[i]; i++) { |
983f938a | 4457 | if (tr->trace_flags & (1 << i)) |
fdb372ed | 4458 | seq_printf(m, "%s\n", trace_options[i]); |
bc0c38d1 | 4459 | else |
fdb372ed | 4460 | seq_printf(m, "no%s\n", trace_options[i]); |
bc0c38d1 SR |
4461 | } |
4462 | ||
adf9f195 FW |
4463 | for (i = 0; trace_opts[i].name; i++) { |
4464 | if (tracer_flags & trace_opts[i].bit) | |
fdb372ed | 4465 | seq_printf(m, "%s\n", trace_opts[i].name); |
adf9f195 | 4466 | else |
fdb372ed | 4467 | seq_printf(m, "no%s\n", trace_opts[i].name); |
adf9f195 | 4468 | } |
d8e83d26 | 4469 | mutex_unlock(&trace_types_lock); |
adf9f195 | 4470 | |
fdb372ed | 4471 | return 0; |
bc0c38d1 | 4472 | } |
bc0c38d1 | 4473 | |
8c1a49ae | 4474 | static int __set_tracer_option(struct trace_array *tr, |
8d18eaaf LZ |
4475 | struct tracer_flags *tracer_flags, |
4476 | struct tracer_opt *opts, int neg) | |
4477 | { | |
d39cdd20 | 4478 | struct tracer *trace = tracer_flags->trace; |
8d18eaaf | 4479 | int ret; |
bc0c38d1 | 4480 | |
8c1a49ae | 4481 | ret = trace->set_flag(tr, tracer_flags->val, opts->bit, !neg); |
8d18eaaf LZ |
4482 | if (ret) |
4483 | return ret; | |
4484 | ||
4485 | if (neg) | |
4486 | tracer_flags->val &= ~opts->bit; | |
4487 | else | |
4488 | tracer_flags->val |= opts->bit; | |
4489 | return 0; | |
bc0c38d1 SR |
4490 | } |
4491 | ||
adf9f195 | 4492 | /* Try to assign a tracer specific option */ |
8c1a49ae | 4493 | static int set_tracer_option(struct trace_array *tr, char *cmp, int neg) |
adf9f195 | 4494 | { |
8c1a49ae | 4495 | struct tracer *trace = tr->current_trace; |
7770841e | 4496 | struct tracer_flags *tracer_flags = trace->flags; |
adf9f195 | 4497 | struct tracer_opt *opts = NULL; |
8d18eaaf | 4498 | int i; |
adf9f195 | 4499 | |
7770841e Z |
4500 | for (i = 0; tracer_flags->opts[i].name; i++) { |
4501 | opts = &tracer_flags->opts[i]; | |
adf9f195 | 4502 | |
8d18eaaf | 4503 | if (strcmp(cmp, opts->name) == 0) |
8c1a49ae | 4504 | return __set_tracer_option(tr, trace->flags, opts, neg); |
adf9f195 | 4505 | } |
adf9f195 | 4506 | |
8d18eaaf | 4507 | return -EINVAL; |
adf9f195 FW |
4508 | } |
4509 | ||
613f04a0 SRRH |
4510 | /* Some tracers require overwrite to stay enabled */ |
4511 | int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set) | |
4512 | { | |
4513 | if (tracer->enabled && (mask & TRACE_ITER_OVERWRITE) && !set) | |
4514 | return -1; | |
4515 | ||
4516 | return 0; | |
4517 | } | |
4518 | ||
2b6080f2 | 4519 | int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled) |
af4617bd SR |
4520 | { |
4521 | /* do nothing if flag is already set */ | |
983f938a | 4522 | if (!!(tr->trace_flags & mask) == !!enabled) |
613f04a0 SRRH |
4523 | return 0; |
4524 | ||
4525 | /* Give the tracer a chance to approve the change */ | |
2b6080f2 | 4526 | if (tr->current_trace->flag_changed) |
bf6065b5 | 4527 | if (tr->current_trace->flag_changed(tr, mask, !!enabled)) |
613f04a0 | 4528 | return -EINVAL; |
af4617bd SR |
4529 | |
4530 | if (enabled) | |
983f938a | 4531 | tr->trace_flags |= mask; |
af4617bd | 4532 | else |
983f938a | 4533 | tr->trace_flags &= ~mask; |
e870e9a1 LZ |
4534 | |
4535 | if (mask == TRACE_ITER_RECORD_CMD) | |
4536 | trace_event_enable_cmd_record(enabled); | |
750912fa | 4537 | |
d914ba37 JF |
4538 | if (mask == TRACE_ITER_RECORD_TGID) { |
4539 | if (!tgid_map) | |
6396bb22 KC |
4540 | tgid_map = kcalloc(PID_MAX_DEFAULT + 1, |
4541 | sizeof(*tgid_map), | |
d914ba37 JF |
4542 | GFP_KERNEL); |
4543 | if (!tgid_map) { | |
4544 | tr->trace_flags &= ~TRACE_ITER_RECORD_TGID; | |
4545 | return -ENOMEM; | |
4546 | } | |
4547 | ||
4548 | trace_event_enable_tgid_record(enabled); | |
4549 | } | |
4550 | ||
c37775d5 SR |
4551 | if (mask == TRACE_ITER_EVENT_FORK) |
4552 | trace_event_follow_fork(tr, enabled); | |
4553 | ||
1e10486f NK |
4554 | if (mask == TRACE_ITER_FUNC_FORK) |
4555 | ftrace_pid_follow_fork(tr, enabled); | |
4556 | ||
80902822 | 4557 | if (mask == TRACE_ITER_OVERWRITE) { |
12883efb | 4558 | ring_buffer_change_overwrite(tr->trace_buffer.buffer, enabled); |
80902822 | 4559 | #ifdef CONFIG_TRACER_MAX_TRACE |
12883efb | 4560 | ring_buffer_change_overwrite(tr->max_buffer.buffer, enabled); |
80902822 SRRH |
4561 | #endif |
4562 | } | |
81698831 | 4563 | |
b9f9108c | 4564 | if (mask == TRACE_ITER_PRINTK) { |
81698831 | 4565 | trace_printk_start_stop_comm(enabled); |
b9f9108c SRRH |
4566 | trace_printk_control(enabled); |
4567 | } | |
613f04a0 SRRH |
4568 | |
4569 | return 0; | |
af4617bd SR |
4570 | } |
4571 | ||
2b6080f2 | 4572 | static int trace_set_options(struct trace_array *tr, char *option) |
bc0c38d1 | 4573 | { |
8d18eaaf | 4574 | char *cmp; |
bc0c38d1 | 4575 | int neg = 0; |
591a033d | 4576 | int ret; |
a4d1e688 | 4577 | size_t orig_len = strlen(option); |
3d739c1f | 4578 | int len; |
bc0c38d1 | 4579 | |
7bcfaf54 | 4580 | cmp = strstrip(option); |
bc0c38d1 | 4581 | |
3d739c1f SRV |
4582 | len = str_has_prefix(cmp, "no"); |
4583 | if (len) | |
bc0c38d1 | 4584 | neg = 1; |
3d739c1f SRV |
4585 | |
4586 | cmp += len; | |
bc0c38d1 | 4587 | |
69d34da2 SRRH |
4588 | mutex_lock(&trace_types_lock); |
4589 | ||
591a033d | 4590 | ret = match_string(trace_options, -1, cmp); |
adf9f195 | 4591 | /* If no option could be set, test the specific tracer options */ |
591a033d | 4592 | if (ret < 0) |
8c1a49ae | 4593 | ret = set_tracer_option(tr, cmp, neg); |
591a033d YX |
4594 | else |
4595 | ret = set_tracer_flag(tr, 1 << ret, !neg); | |
69d34da2 SRRH |
4596 | |
4597 | mutex_unlock(&trace_types_lock); | |
bc0c38d1 | 4598 | |
a4d1e688 JW |
4599 | /* |
4600 | * If the first trailing whitespace is replaced with '\0' by strstrip, | |
4601 | * turn it back into a space. | |
4602 | */ | |
4603 | if (orig_len > strlen(option)) | |
4604 | option[strlen(option)] = ' '; | |
4605 | ||
7bcfaf54 SR |
4606 | return ret; |
4607 | } | |
4608 | ||
a4d1e688 JW |
4609 | static void __init apply_trace_boot_options(void) |
4610 | { | |
4611 | char *buf = trace_boot_options_buf; | |
4612 | char *option; | |
4613 | ||
4614 | while (true) { | |
4615 | option = strsep(&buf, ","); | |
4616 | ||
4617 | if (!option) | |
4618 | break; | |
a4d1e688 | 4619 | |
43ed3843 SRRH |
4620 | if (*option) |
4621 | trace_set_options(&global_trace, option); | |
a4d1e688 JW |
4622 | |
4623 | /* Put back the comma to allow this to be called again */ | |
4624 | if (buf) | |
4625 | *(buf - 1) = ','; | |
4626 | } | |
4627 | } | |
4628 | ||
7bcfaf54 SR |
4629 | static ssize_t |
4630 | tracing_trace_options_write(struct file *filp, const char __user *ubuf, | |
4631 | size_t cnt, loff_t *ppos) | |
4632 | { | |
2b6080f2 SR |
4633 | struct seq_file *m = filp->private_data; |
4634 | struct trace_array *tr = m->private; | |
7bcfaf54 | 4635 | char buf[64]; |
613f04a0 | 4636 | int ret; |
7bcfaf54 SR |
4637 | |
4638 | if (cnt >= sizeof(buf)) | |
4639 | return -EINVAL; | |
4640 | ||
4afe6495 | 4641 | if (copy_from_user(buf, ubuf, cnt)) |
7bcfaf54 SR |
4642 | return -EFAULT; |
4643 | ||
a8dd2176 SR |
4644 | buf[cnt] = 0; |
4645 | ||
2b6080f2 | 4646 | ret = trace_set_options(tr, buf); |
613f04a0 SRRH |
4647 | if (ret < 0) |
4648 | return ret; | |
7bcfaf54 | 4649 | |
cf8517cf | 4650 | *ppos += cnt; |
bc0c38d1 SR |
4651 | |
4652 | return cnt; | |
4653 | } | |
4654 | ||
fdb372ed LZ |
4655 | static int tracing_trace_options_open(struct inode *inode, struct file *file) |
4656 | { | |
7b85af63 | 4657 | struct trace_array *tr = inode->i_private; |
f77d09a3 | 4658 | int ret; |
7b85af63 | 4659 | |
fdb372ed LZ |
4660 | if (tracing_disabled) |
4661 | return -ENODEV; | |
2b6080f2 | 4662 | |
7b85af63 SRRH |
4663 | if (trace_array_get(tr) < 0) |
4664 | return -ENODEV; | |
4665 | ||
f77d09a3 AL |
4666 | ret = single_open(file, tracing_trace_options_show, inode->i_private); |
4667 | if (ret < 0) | |
4668 | trace_array_put(tr); | |
4669 | ||
4670 | return ret; | |
fdb372ed LZ |
4671 | } |
4672 | ||
5e2336a0 | 4673 | static const struct file_operations tracing_iter_fops = { |
fdb372ed LZ |
4674 | .open = tracing_trace_options_open, |
4675 | .read = seq_read, | |
4676 | .llseek = seq_lseek, | |
7b85af63 | 4677 | .release = tracing_single_release_tr, |
ee6bce52 | 4678 | .write = tracing_trace_options_write, |
bc0c38d1 SR |
4679 | }; |
4680 | ||
7bd2f24c IM |
4681 | static const char readme_msg[] = |
4682 | "tracing mini-HOWTO:\n\n" | |
22f45649 SRRH |
4683 | "# echo 0 > tracing_on : quick way to disable tracing\n" |
4684 | "# echo 1 > tracing_on : quick way to re-enable tracing\n\n" | |
4685 | " Important files:\n" | |
4686 | " trace\t\t\t- The static contents of the buffer\n" | |
4687 | "\t\t\t To clear the buffer write into this file: echo > trace\n" | |
4688 | " trace_pipe\t\t- A consuming read to see the contents of the buffer\n" | |
4689 | " current_tracer\t- function and latency tracers\n" | |
4690 | " available_tracers\t- list of configured tracers for current_tracer\n" | |
4691 | " buffer_size_kb\t- view and modify size of per cpu buffer\n" | |
4692 | " buffer_total_size_kb - view total size of all cpu buffers\n\n" | |
4693 | " trace_clock\t\t-change the clock used to order events\n" | |
4694 | " local: Per cpu clock but may not be synced across CPUs\n" | |
4695 | " global: Synced across CPUs but slows tracing down.\n" | |
4696 | " counter: Not a clock, but just an increment\n" | |
4697 | " uptime: Jiffy counter from time of boot\n" | |
4698 | " perf: Same clock that perf events use\n" | |
4699 | #ifdef CONFIG_X86_64 | |
4700 | " x86-tsc: TSC cycle counter\n" | |
4701 | #endif | |
2c1ea60b TZ |
4702 | "\n timestamp_mode\t-view the mode used to timestamp events\n" |
4703 | " delta: Delta difference against a buffer-wide timestamp\n" | |
4704 | " absolute: Absolute (standalone) timestamp\n" | |
22f45649 | 4705 | "\n trace_marker\t\t- Writes into this file writes into the kernel buffer\n" |
fa32e855 | 4706 | "\n trace_marker_raw\t\t- Writes into this file writes binary data into the kernel buffer\n" |
22f45649 SRRH |
4707 | " tracing_cpumask\t- Limit which CPUs to trace\n" |
4708 | " instances\t\t- Make sub-buffers with: mkdir instances/foo\n" | |
4709 | "\t\t\t Remove sub-buffer with rmdir\n" | |
4710 | " trace_options\t\t- Set format or modify how tracing happens\n" | |
71485c45 SRRH |
4711 | "\t\t\t Disable an option by adding a suffix 'no' to the\n" |
4712 | "\t\t\t option name\n" | |
939c7a4f | 4713 | " saved_cmdlines_size\t- echo command number in here to store comm-pid list\n" |
22f45649 SRRH |
4714 | #ifdef CONFIG_DYNAMIC_FTRACE |
4715 | "\n available_filter_functions - list of functions that can be filtered on\n" | |
71485c45 SRRH |
4716 | " set_ftrace_filter\t- echo function name in here to only trace these\n" |
4717 | "\t\t\t functions\n" | |
60f1d5e3 | 4718 | "\t accepts: func_full_name or glob-matching-pattern\n" |
71485c45 SRRH |
4719 | "\t modules: Can select a group via module\n" |
4720 | "\t Format: :mod:<module-name>\n" | |
4721 | "\t example: echo :mod:ext3 > set_ftrace_filter\n" | |
4722 | "\t triggers: a command to perform when function is hit\n" | |
4723 | "\t Format: <function>:<trigger>[:count]\n" | |
4724 | "\t trigger: traceon, traceoff\n" | |
4725 | "\t\t enable_event:<system>:<event>\n" | |
4726 | "\t\t disable_event:<system>:<event>\n" | |
22f45649 | 4727 | #ifdef CONFIG_STACKTRACE |
71485c45 | 4728 | "\t\t stacktrace\n" |
22f45649 SRRH |
4729 | #endif |
4730 | #ifdef CONFIG_TRACER_SNAPSHOT | |
71485c45 | 4731 | "\t\t snapshot\n" |
22f45649 | 4732 | #endif |
17a280ea SRRH |
4733 | "\t\t dump\n" |
4734 | "\t\t cpudump\n" | |
71485c45 SRRH |
4735 | "\t example: echo do_fault:traceoff > set_ftrace_filter\n" |
4736 | "\t echo do_trap:traceoff:3 > set_ftrace_filter\n" | |
4737 | "\t The first one will disable tracing every time do_fault is hit\n" | |
4738 | "\t The second will disable tracing at most 3 times when do_trap is hit\n" | |
4739 | "\t The first time do trap is hit and it disables tracing, the\n" | |
4740 | "\t counter will decrement to 2. If tracing is already disabled,\n" | |
4741 | "\t the counter will not decrement. It only decrements when the\n" | |
4742 | "\t trigger did work\n" | |
4743 | "\t To remove trigger without count:\n" | |
4744 | "\t echo '!<function>:<trigger> > set_ftrace_filter\n" | |
4745 | "\t To remove trigger with a count:\n" | |
4746 | "\t echo '!<function>:<trigger>:0 > set_ftrace_filter\n" | |
22f45649 | 4747 | " set_ftrace_notrace\t- echo function name in here to never trace.\n" |
71485c45 SRRH |
4748 | "\t accepts: func_full_name, *func_end, func_begin*, *func_middle*\n" |
4749 | "\t modules: Can select a group via module command :mod:\n" | |
4750 | "\t Does not accept triggers\n" | |
22f45649 SRRH |
4751 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
4752 | #ifdef CONFIG_FUNCTION_TRACER | |
71485c45 SRRH |
4753 | " set_ftrace_pid\t- Write pid(s) to only function trace those pids\n" |
4754 | "\t\t (function)\n" | |
22f45649 SRRH |
4755 | #endif |
4756 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
4757 | " set_graph_function\t- Trace the nested calls of a function (function_graph)\n" | |
d048a8c7 | 4758 | " set_graph_notrace\t- Do not trace the nested calls of a function (function_graph)\n" |
22f45649 SRRH |
4759 | " max_graph_depth\t- Trace a limited depth of nested calls (0 is unlimited)\n" |
4760 | #endif | |
4761 | #ifdef CONFIG_TRACER_SNAPSHOT | |
71485c45 SRRH |
4762 | "\n snapshot\t\t- Like 'trace' but shows the content of the static\n" |
4763 | "\t\t\t snapshot buffer. Read the contents for more\n" | |
4764 | "\t\t\t information\n" | |
22f45649 | 4765 | #endif |
991821c8 | 4766 | #ifdef CONFIG_STACK_TRACER |
22f45649 SRRH |
4767 | " stack_trace\t\t- Shows the max stack trace when active\n" |
4768 | " stack_max_size\t- Shows current max stack size that was traced\n" | |
71485c45 SRRH |
4769 | "\t\t\t Write into this file to reset the max size (trigger a\n" |
4770 | "\t\t\t new trace)\n" | |
22f45649 | 4771 | #ifdef CONFIG_DYNAMIC_FTRACE |
71485c45 SRRH |
4772 | " stack_trace_filter\t- Like set_ftrace_filter but limits what stack_trace\n" |
4773 | "\t\t\t traces\n" | |
22f45649 | 4774 | #endif |
991821c8 | 4775 | #endif /* CONFIG_STACK_TRACER */ |
5448d44c MH |
4776 | #ifdef CONFIG_DYNAMIC_EVENTS |
4777 | " dynamic_events\t\t- Add/remove/show the generic dynamic events\n" | |
4778 | "\t\t\t Write into this file to define/undefine new trace events.\n" | |
4779 | #endif | |
6b0b7551 | 4780 | #ifdef CONFIG_KPROBE_EVENTS |
86425625 MH |
4781 | " kprobe_events\t\t- Add/remove/show the kernel dynamic events\n" |
4782 | "\t\t\t Write into this file to define/undefine new trace events.\n" | |
4783 | #endif | |
6b0b7551 | 4784 | #ifdef CONFIG_UPROBE_EVENTS |
86425625 MH |
4785 | " uprobe_events\t\t- Add/remove/show the userspace dynamic events\n" |
4786 | "\t\t\t Write into this file to define/undefine new trace events.\n" | |
4787 | #endif | |
6b0b7551 | 4788 | #if defined(CONFIG_KPROBE_EVENTS) || defined(CONFIG_UPROBE_EVENTS) |
86425625 | 4789 | "\t accepts: event-definitions (one definition per line)\n" |
c3ca46ef MH |
4790 | "\t Format: p[:[<group>/]<event>] <place> [<args>]\n" |
4791 | "\t r[maxactive][:[<group>/]<event>] <place> [<args>]\n" | |
7bbab38d MH |
4792 | #ifdef CONFIG_HIST_TRIGGERS |
4793 | "\t s:[synthetic/]<event> <field> [<field>]\n" | |
4794 | #endif | |
86425625 | 4795 | "\t -:[<group>/]<event>\n" |
6b0b7551 | 4796 | #ifdef CONFIG_KPROBE_EVENTS |
86425625 | 4797 | "\t place: [<module>:]<symbol>[+<offset>]|<memaddr>\n" |
35b6f55a | 4798 | "place (kretprobe): [<module>:]<symbol>[+<offset>]|<memaddr>\n" |
86425625 | 4799 | #endif |
6b0b7551 | 4800 | #ifdef CONFIG_UPROBE_EVENTS |
1cc33161 | 4801 | " place (uprobe): <path>:<offset>[(ref_ctr_offset)]\n" |
86425625 MH |
4802 | #endif |
4803 | "\t args: <name>=fetcharg[:type]\n" | |
4804 | "\t fetcharg: %<register>, @<address>, @<symbol>[+|-<offset>],\n" | |
a1303af5 MH |
4805 | #ifdef CONFIG_HAVE_FUNCTION_ARG_ACCESS_API |
4806 | "\t $stack<index>, $stack, $retval, $comm, $arg<N>\n" | |
4807 | #else | |
86425625 | 4808 | "\t $stack<index>, $stack, $retval, $comm\n" |
a1303af5 | 4809 | #endif |
60c2e0ce | 4810 | "\t type: s8/16/32/64, u8/16/32/64, x8/16/32/64, string, symbol,\n" |
40b53b77 MH |
4811 | "\t b<bit-width>@<bit-offset>/<container-size>,\n" |
4812 | "\t <type>\\[<array-size>\\]\n" | |
7bbab38d MH |
4813 | #ifdef CONFIG_HIST_TRIGGERS |
4814 | "\t field: <stype> <name>;\n" | |
4815 | "\t stype: u8/u16/u32/u64, s8/s16/s32/s64, pid_t,\n" | |
4816 | "\t [unsigned] char/int/long\n" | |
4817 | #endif | |
86425625 | 4818 | #endif |
26f25564 TZ |
4819 | " events/\t\t- Directory containing all trace event subsystems:\n" |
4820 | " enable\t\t- Write 0/1 to enable/disable tracing of all events\n" | |
4821 | " events/<system>/\t- Directory containing all trace events for <system>:\n" | |
71485c45 SRRH |
4822 | " enable\t\t- Write 0/1 to enable/disable tracing of all <system>\n" |
4823 | "\t\t\t events\n" | |
26f25564 | 4824 | " filter\t\t- If set, only events passing filter are traced\n" |
71485c45 SRRH |
4825 | " events/<system>/<event>/\t- Directory containing control files for\n" |
4826 | "\t\t\t <event>:\n" | |
26f25564 TZ |
4827 | " enable\t\t- Write 0/1 to enable/disable tracing of <event>\n" |
4828 | " filter\t\t- If set, only events passing filter are traced\n" | |
4829 | " trigger\t\t- If set, a command to perform when event is hit\n" | |
71485c45 SRRH |
4830 | "\t Format: <trigger>[:count][if <filter>]\n" |
4831 | "\t trigger: traceon, traceoff\n" | |
4832 | "\t enable_event:<system>:<event>\n" | |
4833 | "\t disable_event:<system>:<event>\n" | |
d0bad49b TZ |
4834 | #ifdef CONFIG_HIST_TRIGGERS |
4835 | "\t enable_hist:<system>:<event>\n" | |
4836 | "\t disable_hist:<system>:<event>\n" | |
4837 | #endif | |
26f25564 | 4838 | #ifdef CONFIG_STACKTRACE |
71485c45 | 4839 | "\t\t stacktrace\n" |
26f25564 TZ |
4840 | #endif |
4841 | #ifdef CONFIG_TRACER_SNAPSHOT | |
71485c45 | 4842 | "\t\t snapshot\n" |
7ef224d1 TZ |
4843 | #endif |
4844 | #ifdef CONFIG_HIST_TRIGGERS | |
4845 | "\t\t hist (see below)\n" | |
26f25564 | 4846 | #endif |
71485c45 SRRH |
4847 | "\t example: echo traceoff > events/block/block_unplug/trigger\n" |
4848 | "\t echo traceoff:3 > events/block/block_unplug/trigger\n" | |
4849 | "\t echo 'enable_event:kmem:kmalloc:3 if nr_rq > 1' > \\\n" | |
4850 | "\t events/block/block_unplug/trigger\n" | |
4851 | "\t The first disables tracing every time block_unplug is hit.\n" | |
4852 | "\t The second disables tracing the first 3 times block_unplug is hit.\n" | |
4853 | "\t The third enables the kmalloc event the first 3 times block_unplug\n" | |
4854 | "\t is hit and has value of greater than 1 for the 'nr_rq' event field.\n" | |
4855 | "\t Like function triggers, the counter is only decremented if it\n" | |
4856 | "\t enabled or disabled tracing.\n" | |
4857 | "\t To remove a trigger without a count:\n" | |
4858 | "\t echo '!<trigger> > <system>/<event>/trigger\n" | |
4859 | "\t To remove a trigger with a count:\n" | |
4860 | "\t echo '!<trigger>:0 > <system>/<event>/trigger\n" | |
4861 | "\t Filters can be ignored when removing a trigger.\n" | |
7ef224d1 TZ |
4862 | #ifdef CONFIG_HIST_TRIGGERS |
4863 | " hist trigger\t- If set, event hits are aggregated into a hash table\n" | |
76a3b0c8 | 4864 | "\t Format: hist:keys=<field1[,field2,...]>\n" |
f2606835 | 4865 | "\t [:values=<field1[,field2,...]>]\n" |
e62347d2 | 4866 | "\t [:sort=<field1[,field2,...]>]\n" |
7ef224d1 | 4867 | "\t [:size=#entries]\n" |
e86ae9ba | 4868 | "\t [:pause][:continue][:clear]\n" |
5463bfda | 4869 | "\t [:name=histname1]\n" |
c3e49506 | 4870 | "\t [:<handler>.<action>]\n" |
7ef224d1 TZ |
4871 | "\t [if <filter>]\n\n" |
4872 | "\t When a matching event is hit, an entry is added to a hash\n" | |
f2606835 TZ |
4873 | "\t table using the key(s) and value(s) named, and the value of a\n" |
4874 | "\t sum called 'hitcount' is incremented. Keys and values\n" | |
4875 | "\t correspond to fields in the event's format description. Keys\n" | |
69a0200c TZ |
4876 | "\t can be any field, or the special string 'stacktrace'.\n" |
4877 | "\t Compound keys consisting of up to two fields can be specified\n" | |
4878 | "\t by the 'keys' keyword. Values must correspond to numeric\n" | |
4879 | "\t fields. Sort keys consisting of up to two fields can be\n" | |
4880 | "\t specified using the 'sort' keyword. The sort direction can\n" | |
4881 | "\t be modified by appending '.descending' or '.ascending' to a\n" | |
4882 | "\t sort field. The 'size' parameter can be used to specify more\n" | |
5463bfda TZ |
4883 | "\t or fewer than the default 2048 entries for the hashtable size.\n" |
4884 | "\t If a hist trigger is given a name using the 'name' parameter,\n" | |
4885 | "\t its histogram data will be shared with other triggers of the\n" | |
4886 | "\t same name, and trigger hits will update this common data.\n\n" | |
7ef224d1 | 4887 | "\t Reading the 'hist' file for the event will dump the hash\n" |
52a7f16d TZ |
4888 | "\t table in its entirety to stdout. If there are multiple hist\n" |
4889 | "\t triggers attached to an event, there will be a table for each\n" | |
5463bfda TZ |
4890 | "\t trigger in the output. The table displayed for a named\n" |
4891 | "\t trigger will be the same as any other instance having the\n" | |
4892 | "\t same name. The default format used to display a given field\n" | |
4893 | "\t can be modified by appending any of the following modifiers\n" | |
4894 | "\t to the field name, as applicable:\n\n" | |
c6afad49 TZ |
4895 | "\t .hex display a number as a hex value\n" |
4896 | "\t .sym display an address as a symbol\n" | |
6b4827ad | 4897 | "\t .sym-offset display an address as a symbol and offset\n" |
31696198 | 4898 | "\t .execname display a common_pid as a program name\n" |
860f9f6b TZ |
4899 | "\t .syscall display a syscall id as a syscall name\n" |
4900 | "\t .log2 display log2 value rather than raw number\n" | |
4901 | "\t .usecs display a common_timestamp in microseconds\n\n" | |
83e99914 TZ |
4902 | "\t The 'pause' parameter can be used to pause an existing hist\n" |
4903 | "\t trigger or to start a hist trigger but not log any events\n" | |
4904 | "\t until told to do so. 'continue' can be used to start or\n" | |
4905 | "\t restart a paused hist trigger.\n\n" | |
e86ae9ba TZ |
4906 | "\t The 'clear' parameter will clear the contents of a running\n" |
4907 | "\t hist trigger and leave its current paused/active state\n" | |
4908 | "\t unchanged.\n\n" | |
d0bad49b TZ |
4909 | "\t The enable_hist and disable_hist triggers can be used to\n" |
4910 | "\t have one event conditionally start and stop another event's\n" | |
4911 | "\t already-attached hist trigger. The syntax is analagous to\n" | |
c3e49506 TZ |
4912 | "\t the enable_event and disable_event triggers.\n\n" |
4913 | "\t Hist trigger handlers and actions are executed whenever a\n" | |
4914 | "\t a histogram entry is added or updated. They take the form:\n\n" | |
4915 | "\t <handler>.<action>\n\n" | |
4916 | "\t The available handlers are:\n\n" | |
4917 | "\t onmatch(matching.event) - invoke on addition or update\n" | |
4918 | "\t onmax(var) - invoke if var exceeds current max\n\n" | |
4919 | "\t The available actions are:\n\n" | |
4920 | "\t <synthetic_event>(param list) - generate synthetic event\n" | |
4921 | "\t save(field,...) - save current event fields\n" | |
7ef224d1 | 4922 | #endif |
7bd2f24c IM |
4923 | ; |
4924 | ||
4925 | static ssize_t | |
4926 | tracing_readme_read(struct file *filp, char __user *ubuf, | |
4927 | size_t cnt, loff_t *ppos) | |
4928 | { | |
4929 | return simple_read_from_buffer(ubuf, cnt, ppos, | |
4930 | readme_msg, strlen(readme_msg)); | |
4931 | } | |
4932 | ||
5e2336a0 | 4933 | static const struct file_operations tracing_readme_fops = { |
c7078de1 IM |
4934 | .open = tracing_open_generic, |
4935 | .read = tracing_readme_read, | |
b444786f | 4936 | .llseek = generic_file_llseek, |
7bd2f24c IM |
4937 | }; |
4938 | ||
99c621d7 MS |
4939 | static void *saved_tgids_next(struct seq_file *m, void *v, loff_t *pos) |
4940 | { | |
4941 | int *ptr = v; | |
4942 | ||
4943 | if (*pos || m->count) | |
4944 | ptr++; | |
4945 | ||
4946 | (*pos)++; | |
4947 | ||
4948 | for (; ptr <= &tgid_map[PID_MAX_DEFAULT]; ptr++) { | |
4949 | if (trace_find_tgid(*ptr)) | |
4950 | return ptr; | |
4951 | } | |
4952 | ||
4953 | return NULL; | |
4954 | } | |
4955 | ||
4956 | static void *saved_tgids_start(struct seq_file *m, loff_t *pos) | |
4957 | { | |
4958 | void *v; | |
4959 | loff_t l = 0; | |
4960 | ||
4961 | if (!tgid_map) | |
4962 | return NULL; | |
4963 | ||
4964 | v = &tgid_map[0]; | |
4965 | while (l <= *pos) { | |
4966 | v = saved_tgids_next(m, v, &l); | |
4967 | if (!v) | |
4968 | return NULL; | |
4969 | } | |
4970 | ||
4971 | return v; | |
4972 | } | |
4973 | ||
4974 | static void saved_tgids_stop(struct seq_file *m, void *v) | |
4975 | { | |
4976 | } | |
4977 | ||
4978 | static int saved_tgids_show(struct seq_file *m, void *v) | |
4979 | { | |
4980 | int pid = (int *)v - tgid_map; | |
4981 | ||
4982 | seq_printf(m, "%d %d\n", pid, trace_find_tgid(pid)); | |
4983 | return 0; | |
4984 | } | |
4985 | ||
4986 | static const struct seq_operations tracing_saved_tgids_seq_ops = { | |
4987 | .start = saved_tgids_start, | |
4988 | .stop = saved_tgids_stop, | |
4989 | .next = saved_tgids_next, | |
4990 | .show = saved_tgids_show, | |
4991 | }; | |
4992 | ||
4993 | static int tracing_saved_tgids_open(struct inode *inode, struct file *filp) | |
4994 | { | |
4995 | if (tracing_disabled) | |
4996 | return -ENODEV; | |
4997 | ||
4998 | return seq_open(filp, &tracing_saved_tgids_seq_ops); | |
4999 | } | |
5000 | ||
5001 | ||
5002 | static const struct file_operations tracing_saved_tgids_fops = { | |
5003 | .open = tracing_saved_tgids_open, | |
5004 | .read = seq_read, | |
5005 | .llseek = seq_lseek, | |
5006 | .release = seq_release, | |
5007 | }; | |
5008 | ||
42584c81 YY |
5009 | static void *saved_cmdlines_next(struct seq_file *m, void *v, loff_t *pos) |
5010 | { | |
5011 | unsigned int *ptr = v; | |
69abe6a5 | 5012 | |
42584c81 YY |
5013 | if (*pos || m->count) |
5014 | ptr++; | |
69abe6a5 | 5015 | |
42584c81 | 5016 | (*pos)++; |
69abe6a5 | 5017 | |
939c7a4f YY |
5018 | for (; ptr < &savedcmd->map_cmdline_to_pid[savedcmd->cmdline_num]; |
5019 | ptr++) { | |
42584c81 YY |
5020 | if (*ptr == -1 || *ptr == NO_CMDLINE_MAP) |
5021 | continue; | |
69abe6a5 | 5022 | |
42584c81 YY |
5023 | return ptr; |
5024 | } | |
69abe6a5 | 5025 | |
42584c81 YY |
5026 | return NULL; |
5027 | } | |
5028 | ||
5029 | static void *saved_cmdlines_start(struct seq_file *m, loff_t *pos) | |
5030 | { | |
5031 | void *v; | |
5032 | loff_t l = 0; | |
69abe6a5 | 5033 | |
4c27e756 SRRH |
5034 | preempt_disable(); |
5035 | arch_spin_lock(&trace_cmdline_lock); | |
5036 | ||
939c7a4f | 5037 | v = &savedcmd->map_cmdline_to_pid[0]; |
42584c81 YY |
5038 | while (l <= *pos) { |
5039 | v = saved_cmdlines_next(m, v, &l); | |
5040 | if (!v) | |
5041 | return NULL; | |
69abe6a5 AP |
5042 | } |
5043 | ||
42584c81 YY |
5044 | return v; |
5045 | } | |
5046 | ||
5047 | static void saved_cmdlines_stop(struct seq_file *m, void *v) | |
5048 | { | |
4c27e756 SRRH |
5049 | arch_spin_unlock(&trace_cmdline_lock); |
5050 | preempt_enable(); | |
42584c81 | 5051 | } |
69abe6a5 | 5052 | |
42584c81 YY |
5053 | static int saved_cmdlines_show(struct seq_file *m, void *v) |
5054 | { | |
5055 | char buf[TASK_COMM_LEN]; | |
5056 | unsigned int *pid = v; | |
69abe6a5 | 5057 | |
4c27e756 | 5058 | __trace_find_cmdline(*pid, buf); |
42584c81 YY |
5059 | seq_printf(m, "%d %s\n", *pid, buf); |
5060 | return 0; | |
5061 | } | |
5062 | ||
5063 | static const struct seq_operations tracing_saved_cmdlines_seq_ops = { | |
5064 | .start = saved_cmdlines_start, | |
5065 | .next = saved_cmdlines_next, | |
5066 | .stop = saved_cmdlines_stop, | |
5067 | .show = saved_cmdlines_show, | |
5068 | }; | |
5069 | ||
5070 | static int tracing_saved_cmdlines_open(struct inode *inode, struct file *filp) | |
5071 | { | |
5072 | if (tracing_disabled) | |
5073 | return -ENODEV; | |
5074 | ||
5075 | return seq_open(filp, &tracing_saved_cmdlines_seq_ops); | |
69abe6a5 AP |
5076 | } |
5077 | ||
5078 | static const struct file_operations tracing_saved_cmdlines_fops = { | |
42584c81 YY |
5079 | .open = tracing_saved_cmdlines_open, |
5080 | .read = seq_read, | |
5081 | .llseek = seq_lseek, | |
5082 | .release = seq_release, | |
69abe6a5 AP |
5083 | }; |
5084 | ||
939c7a4f YY |
5085 | static ssize_t |
5086 | tracing_saved_cmdlines_size_read(struct file *filp, char __user *ubuf, | |
5087 | size_t cnt, loff_t *ppos) | |
5088 | { | |
5089 | char buf[64]; | |
5090 | int r; | |
5091 | ||
5092 | arch_spin_lock(&trace_cmdline_lock); | |
a6af8fbf | 5093 | r = scnprintf(buf, sizeof(buf), "%u\n", savedcmd->cmdline_num); |
939c7a4f YY |
5094 | arch_spin_unlock(&trace_cmdline_lock); |
5095 | ||
5096 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
5097 | } | |
5098 | ||
5099 | static void free_saved_cmdlines_buffer(struct saved_cmdlines_buffer *s) | |
5100 | { | |
5101 | kfree(s->saved_cmdlines); | |
5102 | kfree(s->map_cmdline_to_pid); | |
5103 | kfree(s); | |
5104 | } | |
5105 | ||
5106 | static int tracing_resize_saved_cmdlines(unsigned int val) | |
5107 | { | |
5108 | struct saved_cmdlines_buffer *s, *savedcmd_temp; | |
5109 | ||
a6af8fbf | 5110 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
939c7a4f YY |
5111 | if (!s) |
5112 | return -ENOMEM; | |
5113 | ||
5114 | if (allocate_cmdlines_buffer(val, s) < 0) { | |
5115 | kfree(s); | |
5116 | return -ENOMEM; | |
5117 | } | |
5118 | ||
5119 | arch_spin_lock(&trace_cmdline_lock); | |
5120 | savedcmd_temp = savedcmd; | |
5121 | savedcmd = s; | |
5122 | arch_spin_unlock(&trace_cmdline_lock); | |
5123 | free_saved_cmdlines_buffer(savedcmd_temp); | |
5124 | ||
5125 | return 0; | |
5126 | } | |
5127 | ||
5128 | static ssize_t | |
5129 | tracing_saved_cmdlines_size_write(struct file *filp, const char __user *ubuf, | |
5130 | size_t cnt, loff_t *ppos) | |
5131 | { | |
5132 | unsigned long val; | |
5133 | int ret; | |
5134 | ||
5135 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); | |
5136 | if (ret) | |
5137 | return ret; | |
5138 | ||
5139 | /* must have at least 1 entry or less than PID_MAX_DEFAULT */ | |
5140 | if (!val || val > PID_MAX_DEFAULT) | |
5141 | return -EINVAL; | |
5142 | ||
5143 | ret = tracing_resize_saved_cmdlines((unsigned int)val); | |
5144 | if (ret < 0) | |
5145 | return ret; | |
5146 | ||
5147 | *ppos += cnt; | |
5148 | ||
5149 | return cnt; | |
5150 | } | |
5151 | ||
5152 | static const struct file_operations tracing_saved_cmdlines_size_fops = { | |
5153 | .open = tracing_open_generic, | |
5154 | .read = tracing_saved_cmdlines_size_read, | |
5155 | .write = tracing_saved_cmdlines_size_write, | |
5156 | }; | |
5157 | ||
681bec03 | 5158 | #ifdef CONFIG_TRACE_EVAL_MAP_FILE |
23bf8cb8 | 5159 | static union trace_eval_map_item * |
f57a4143 | 5160 | update_eval_map(union trace_eval_map_item *ptr) |
9828413d | 5161 | { |
00f4b652 | 5162 | if (!ptr->map.eval_string) { |
9828413d SRRH |
5163 | if (ptr->tail.next) { |
5164 | ptr = ptr->tail.next; | |
5165 | /* Set ptr to the next real item (skip head) */ | |
5166 | ptr++; | |
5167 | } else | |
5168 | return NULL; | |
5169 | } | |
5170 | return ptr; | |
5171 | } | |
5172 | ||
f57a4143 | 5173 | static void *eval_map_next(struct seq_file *m, void *v, loff_t *pos) |
9828413d | 5174 | { |
23bf8cb8 | 5175 | union trace_eval_map_item *ptr = v; |
9828413d SRRH |
5176 | |
5177 | /* | |
5178 | * Paranoid! If ptr points to end, we don't want to increment past it. | |
5179 | * This really should never happen. | |
5180 | */ | |
f57a4143 | 5181 | ptr = update_eval_map(ptr); |
9828413d SRRH |
5182 | if (WARN_ON_ONCE(!ptr)) |
5183 | return NULL; | |
5184 | ||
5185 | ptr++; | |
5186 | ||
5187 | (*pos)++; | |
5188 | ||
f57a4143 | 5189 | ptr = update_eval_map(ptr); |
9828413d SRRH |
5190 | |
5191 | return ptr; | |
5192 | } | |
5193 | ||
f57a4143 | 5194 | static void *eval_map_start(struct seq_file *m, loff_t *pos) |
9828413d | 5195 | { |
23bf8cb8 | 5196 | union trace_eval_map_item *v; |
9828413d SRRH |
5197 | loff_t l = 0; |
5198 | ||
1793ed93 | 5199 | mutex_lock(&trace_eval_mutex); |
9828413d | 5200 | |
23bf8cb8 | 5201 | v = trace_eval_maps; |
9828413d SRRH |
5202 | if (v) |
5203 | v++; | |
5204 | ||
5205 | while (v && l < *pos) { | |
f57a4143 | 5206 | v = eval_map_next(m, v, &l); |
9828413d SRRH |
5207 | } |
5208 | ||
5209 | return v; | |
5210 | } | |
5211 | ||
f57a4143 | 5212 | static void eval_map_stop(struct seq_file *m, void *v) |
9828413d | 5213 | { |
1793ed93 | 5214 | mutex_unlock(&trace_eval_mutex); |
9828413d SRRH |
5215 | } |
5216 | ||
f57a4143 | 5217 | static int eval_map_show(struct seq_file *m, void *v) |
9828413d | 5218 | { |
23bf8cb8 | 5219 | union trace_eval_map_item *ptr = v; |
9828413d SRRH |
5220 | |
5221 | seq_printf(m, "%s %ld (%s)\n", | |
00f4b652 | 5222 | ptr->map.eval_string, ptr->map.eval_value, |
9828413d SRRH |
5223 | ptr->map.system); |
5224 | ||
5225 | return 0; | |
5226 | } | |
5227 | ||
f57a4143 JL |
5228 | static const struct seq_operations tracing_eval_map_seq_ops = { |
5229 | .start = eval_map_start, | |
5230 | .next = eval_map_next, | |
5231 | .stop = eval_map_stop, | |
5232 | .show = eval_map_show, | |
9828413d SRRH |
5233 | }; |
5234 | ||
f57a4143 | 5235 | static int tracing_eval_map_open(struct inode *inode, struct file *filp) |
9828413d SRRH |
5236 | { |
5237 | if (tracing_disabled) | |
5238 | return -ENODEV; | |
5239 | ||
f57a4143 | 5240 | return seq_open(filp, &tracing_eval_map_seq_ops); |
9828413d SRRH |
5241 | } |
5242 | ||
f57a4143 JL |
5243 | static const struct file_operations tracing_eval_map_fops = { |
5244 | .open = tracing_eval_map_open, | |
9828413d SRRH |
5245 | .read = seq_read, |
5246 | .llseek = seq_lseek, | |
5247 | .release = seq_release, | |
5248 | }; | |
5249 | ||
23bf8cb8 | 5250 | static inline union trace_eval_map_item * |
5f60b351 | 5251 | trace_eval_jmp_to_tail(union trace_eval_map_item *ptr) |
9828413d SRRH |
5252 | { |
5253 | /* Return tail of array given the head */ | |
5254 | return ptr + ptr->head.length + 1; | |
5255 | } | |
5256 | ||
5257 | static void | |
f57a4143 | 5258 | trace_insert_eval_map_file(struct module *mod, struct trace_eval_map **start, |
9828413d SRRH |
5259 | int len) |
5260 | { | |
00f4b652 JL |
5261 | struct trace_eval_map **stop; |
5262 | struct trace_eval_map **map; | |
23bf8cb8 JL |
5263 | union trace_eval_map_item *map_array; |
5264 | union trace_eval_map_item *ptr; | |
9828413d SRRH |
5265 | |
5266 | stop = start + len; | |
5267 | ||
5268 | /* | |
23bf8cb8 | 5269 | * The trace_eval_maps contains the map plus a head and tail item, |
9828413d SRRH |
5270 | * where the head holds the module and length of array, and the |
5271 | * tail holds a pointer to the next list. | |
5272 | */ | |
6da2ec56 | 5273 | map_array = kmalloc_array(len + 2, sizeof(*map_array), GFP_KERNEL); |
9828413d | 5274 | if (!map_array) { |
f57a4143 | 5275 | pr_warn("Unable to allocate trace eval mapping\n"); |
9828413d SRRH |
5276 | return; |
5277 | } | |
5278 | ||
1793ed93 | 5279 | mutex_lock(&trace_eval_mutex); |
9828413d | 5280 | |
23bf8cb8 JL |
5281 | if (!trace_eval_maps) |
5282 | trace_eval_maps = map_array; | |
9828413d | 5283 | else { |
23bf8cb8 | 5284 | ptr = trace_eval_maps; |
9828413d | 5285 | for (;;) { |
5f60b351 | 5286 | ptr = trace_eval_jmp_to_tail(ptr); |
9828413d SRRH |
5287 | if (!ptr->tail.next) |
5288 | break; | |
5289 | ptr = ptr->tail.next; | |
5290 | ||
5291 | } | |
5292 | ptr->tail.next = map_array; | |
5293 | } | |
5294 | map_array->head.mod = mod; | |
5295 | map_array->head.length = len; | |
5296 | map_array++; | |
5297 | ||
5298 | for (map = start; (unsigned long)map < (unsigned long)stop; map++) { | |
5299 | map_array->map = **map; | |
5300 | map_array++; | |
5301 | } | |
5302 | memset(map_array, 0, sizeof(*map_array)); | |
5303 | ||
1793ed93 | 5304 | mutex_unlock(&trace_eval_mutex); |
9828413d SRRH |
5305 | } |
5306 | ||
f57a4143 | 5307 | static void trace_create_eval_file(struct dentry *d_tracer) |
9828413d | 5308 | { |
681bec03 | 5309 | trace_create_file("eval_map", 0444, d_tracer, |
f57a4143 | 5310 | NULL, &tracing_eval_map_fops); |
9828413d SRRH |
5311 | } |
5312 | ||
681bec03 | 5313 | #else /* CONFIG_TRACE_EVAL_MAP_FILE */ |
f57a4143 JL |
5314 | static inline void trace_create_eval_file(struct dentry *d_tracer) { } |
5315 | static inline void trace_insert_eval_map_file(struct module *mod, | |
00f4b652 | 5316 | struct trace_eval_map **start, int len) { } |
681bec03 | 5317 | #endif /* !CONFIG_TRACE_EVAL_MAP_FILE */ |
9828413d | 5318 | |
f57a4143 | 5319 | static void trace_insert_eval_map(struct module *mod, |
00f4b652 | 5320 | struct trace_eval_map **start, int len) |
0c564a53 | 5321 | { |
00f4b652 | 5322 | struct trace_eval_map **map; |
0c564a53 SRRH |
5323 | |
5324 | if (len <= 0) | |
5325 | return; | |
5326 | ||
5327 | map = start; | |
5328 | ||
f57a4143 | 5329 | trace_event_eval_update(map, len); |
9828413d | 5330 | |
f57a4143 | 5331 | trace_insert_eval_map_file(mod, start, len); |
0c564a53 SRRH |
5332 | } |
5333 | ||
bc0c38d1 SR |
5334 | static ssize_t |
5335 | tracing_set_trace_read(struct file *filp, char __user *ubuf, | |
5336 | size_t cnt, loff_t *ppos) | |
5337 | { | |
2b6080f2 | 5338 | struct trace_array *tr = filp->private_data; |
ee6c2c1b | 5339 | char buf[MAX_TRACER_SIZE+2]; |
bc0c38d1 SR |
5340 | int r; |
5341 | ||
5342 | mutex_lock(&trace_types_lock); | |
2b6080f2 | 5343 | r = sprintf(buf, "%s\n", tr->current_trace->name); |
bc0c38d1 SR |
5344 | mutex_unlock(&trace_types_lock); |
5345 | ||
4bf39a94 | 5346 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
5347 | } |
5348 | ||
b6f11df2 ACM |
5349 | int tracer_init(struct tracer *t, struct trace_array *tr) |
5350 | { | |
12883efb | 5351 | tracing_reset_online_cpus(&tr->trace_buffer); |
b6f11df2 ACM |
5352 | return t->init(tr); |
5353 | } | |
5354 | ||
12883efb | 5355 | static void set_buffer_entries(struct trace_buffer *buf, unsigned long val) |
438ced17 VN |
5356 | { |
5357 | int cpu; | |
737223fb | 5358 | |
438ced17 | 5359 | for_each_tracing_cpu(cpu) |
12883efb | 5360 | per_cpu_ptr(buf->data, cpu)->entries = val; |
438ced17 VN |
5361 | } |
5362 | ||
12883efb | 5363 | #ifdef CONFIG_TRACER_MAX_TRACE |
d60da506 | 5364 | /* resize @tr's buffer to the size of @size_tr's entries */ |
12883efb SRRH |
5365 | static int resize_buffer_duplicate_size(struct trace_buffer *trace_buf, |
5366 | struct trace_buffer *size_buf, int cpu_id) | |
d60da506 HT |
5367 | { |
5368 | int cpu, ret = 0; | |
5369 | ||
5370 | if (cpu_id == RING_BUFFER_ALL_CPUS) { | |
5371 | for_each_tracing_cpu(cpu) { | |
12883efb SRRH |
5372 | ret = ring_buffer_resize(trace_buf->buffer, |
5373 | per_cpu_ptr(size_buf->data, cpu)->entries, cpu); | |
d60da506 HT |
5374 | if (ret < 0) |
5375 | break; | |
12883efb SRRH |
5376 | per_cpu_ptr(trace_buf->data, cpu)->entries = |
5377 | per_cpu_ptr(size_buf->data, cpu)->entries; | |
d60da506 HT |
5378 | } |
5379 | } else { | |
12883efb SRRH |
5380 | ret = ring_buffer_resize(trace_buf->buffer, |
5381 | per_cpu_ptr(size_buf->data, cpu_id)->entries, cpu_id); | |
d60da506 | 5382 | if (ret == 0) |
12883efb SRRH |
5383 | per_cpu_ptr(trace_buf->data, cpu_id)->entries = |
5384 | per_cpu_ptr(size_buf->data, cpu_id)->entries; | |
d60da506 HT |
5385 | } |
5386 | ||
5387 | return ret; | |
5388 | } | |
12883efb | 5389 | #endif /* CONFIG_TRACER_MAX_TRACE */ |
d60da506 | 5390 | |
2b6080f2 SR |
5391 | static int __tracing_resize_ring_buffer(struct trace_array *tr, |
5392 | unsigned long size, int cpu) | |
73c5162a SR |
5393 | { |
5394 | int ret; | |
5395 | ||
5396 | /* | |
5397 | * If kernel or user changes the size of the ring buffer | |
a123c52b SR |
5398 | * we use the size that was given, and we can forget about |
5399 | * expanding it later. | |
73c5162a | 5400 | */ |
55034cd6 | 5401 | ring_buffer_expanded = true; |
73c5162a | 5402 | |
b382ede6 | 5403 | /* May be called before buffers are initialized */ |
12883efb | 5404 | if (!tr->trace_buffer.buffer) |
b382ede6 SR |
5405 | return 0; |
5406 | ||
12883efb | 5407 | ret = ring_buffer_resize(tr->trace_buffer.buffer, size, cpu); |
73c5162a SR |
5408 | if (ret < 0) |
5409 | return ret; | |
5410 | ||
12883efb | 5411 | #ifdef CONFIG_TRACER_MAX_TRACE |
2b6080f2 SR |
5412 | if (!(tr->flags & TRACE_ARRAY_FL_GLOBAL) || |
5413 | !tr->current_trace->use_max_tr) | |
ef710e10 KM |
5414 | goto out; |
5415 | ||
12883efb | 5416 | ret = ring_buffer_resize(tr->max_buffer.buffer, size, cpu); |
73c5162a | 5417 | if (ret < 0) { |
12883efb SRRH |
5418 | int r = resize_buffer_duplicate_size(&tr->trace_buffer, |
5419 | &tr->trace_buffer, cpu); | |
73c5162a | 5420 | if (r < 0) { |
a123c52b SR |
5421 | /* |
5422 | * AARGH! We are left with different | |
5423 | * size max buffer!!!! | |
5424 | * The max buffer is our "snapshot" buffer. | |
5425 | * When a tracer needs a snapshot (one of the | |
5426 | * latency tracers), it swaps the max buffer | |
5427 | * with the saved snap shot. We succeeded to | |
5428 | * update the size of the main buffer, but failed to | |
5429 | * update the size of the max buffer. But when we tried | |
5430 | * to reset the main buffer to the original size, we | |
5431 | * failed there too. This is very unlikely to | |
5432 | * happen, but if it does, warn and kill all | |
5433 | * tracing. | |
5434 | */ | |
73c5162a SR |
5435 | WARN_ON(1); |
5436 | tracing_disabled = 1; | |
5437 | } | |
5438 | return ret; | |
5439 | } | |
5440 | ||
438ced17 | 5441 | if (cpu == RING_BUFFER_ALL_CPUS) |
12883efb | 5442 | set_buffer_entries(&tr->max_buffer, size); |
438ced17 | 5443 | else |
12883efb | 5444 | per_cpu_ptr(tr->max_buffer.data, cpu)->entries = size; |
438ced17 | 5445 | |
ef710e10 | 5446 | out: |
12883efb SRRH |
5447 | #endif /* CONFIG_TRACER_MAX_TRACE */ |
5448 | ||
438ced17 | 5449 | if (cpu == RING_BUFFER_ALL_CPUS) |
12883efb | 5450 | set_buffer_entries(&tr->trace_buffer, size); |
438ced17 | 5451 | else |
12883efb | 5452 | per_cpu_ptr(tr->trace_buffer.data, cpu)->entries = size; |
73c5162a SR |
5453 | |
5454 | return ret; | |
5455 | } | |
5456 | ||
2b6080f2 SR |
5457 | static ssize_t tracing_resize_ring_buffer(struct trace_array *tr, |
5458 | unsigned long size, int cpu_id) | |
4f271a2a | 5459 | { |
83f40318 | 5460 | int ret = size; |
4f271a2a VN |
5461 | |
5462 | mutex_lock(&trace_types_lock); | |
5463 | ||
438ced17 VN |
5464 | if (cpu_id != RING_BUFFER_ALL_CPUS) { |
5465 | /* make sure, this cpu is enabled in the mask */ | |
5466 | if (!cpumask_test_cpu(cpu_id, tracing_buffer_mask)) { | |
5467 | ret = -EINVAL; | |
5468 | goto out; | |
5469 | } | |
5470 | } | |
4f271a2a | 5471 | |
2b6080f2 | 5472 | ret = __tracing_resize_ring_buffer(tr, size, cpu_id); |
4f271a2a VN |
5473 | if (ret < 0) |
5474 | ret = -ENOMEM; | |
5475 | ||
438ced17 | 5476 | out: |
4f271a2a VN |
5477 | mutex_unlock(&trace_types_lock); |
5478 | ||
5479 | return ret; | |
5480 | } | |
5481 | ||
ef710e10 | 5482 | |
1852fcce SR |
5483 | /** |
5484 | * tracing_update_buffers - used by tracing facility to expand ring buffers | |
5485 | * | |
5486 | * To save on memory when the tracing is never used on a system with it | |
5487 | * configured in. The ring buffers are set to a minimum size. But once | |
5488 | * a user starts to use the tracing facility, then they need to grow | |
5489 | * to their default size. | |
5490 | * | |
5491 | * This function is to be called when a tracer is about to be used. | |
5492 | */ | |
5493 | int tracing_update_buffers(void) | |
5494 | { | |
5495 | int ret = 0; | |
5496 | ||
1027fcb2 | 5497 | mutex_lock(&trace_types_lock); |
1852fcce | 5498 | if (!ring_buffer_expanded) |
2b6080f2 | 5499 | ret = __tracing_resize_ring_buffer(&global_trace, trace_buf_size, |
438ced17 | 5500 | RING_BUFFER_ALL_CPUS); |
1027fcb2 | 5501 | mutex_unlock(&trace_types_lock); |
1852fcce SR |
5502 | |
5503 | return ret; | |
5504 | } | |
5505 | ||
577b785f SR |
5506 | struct trace_option_dentry; |
5507 | ||
37aea98b | 5508 | static void |
2b6080f2 | 5509 | create_trace_option_files(struct trace_array *tr, struct tracer *tracer); |
577b785f | 5510 | |
6b450d25 SRRH |
5511 | /* |
5512 | * Used to clear out the tracer before deletion of an instance. | |
5513 | * Must have trace_types_lock held. | |
5514 | */ | |
5515 | static void tracing_set_nop(struct trace_array *tr) | |
5516 | { | |
5517 | if (tr->current_trace == &nop_trace) | |
5518 | return; | |
5519 | ||
50512ab5 | 5520 | tr->current_trace->enabled--; |
6b450d25 SRRH |
5521 | |
5522 | if (tr->current_trace->reset) | |
5523 | tr->current_trace->reset(tr); | |
5524 | ||
5525 | tr->current_trace = &nop_trace; | |
5526 | } | |
5527 | ||
41d9c0be | 5528 | static void add_tracer_options(struct trace_array *tr, struct tracer *t) |
bc0c38d1 | 5529 | { |
09d23a1d SRRH |
5530 | /* Only enable if the directory has been created already. */ |
5531 | if (!tr->dir) | |
5532 | return; | |
5533 | ||
37aea98b | 5534 | create_trace_option_files(tr, t); |
09d23a1d SRRH |
5535 | } |
5536 | ||
5537 | static int tracing_set_tracer(struct trace_array *tr, const char *buf) | |
5538 | { | |
bc0c38d1 | 5539 | struct tracer *t; |
12883efb | 5540 | #ifdef CONFIG_TRACER_MAX_TRACE |
34600f0e | 5541 | bool had_max_tr; |
12883efb | 5542 | #endif |
d9e54076 | 5543 | int ret = 0; |
bc0c38d1 | 5544 | |
1027fcb2 SR |
5545 | mutex_lock(&trace_types_lock); |
5546 | ||
73c5162a | 5547 | if (!ring_buffer_expanded) { |
2b6080f2 | 5548 | ret = __tracing_resize_ring_buffer(tr, trace_buf_size, |
438ced17 | 5549 | RING_BUFFER_ALL_CPUS); |
73c5162a | 5550 | if (ret < 0) |
59f586db | 5551 | goto out; |
73c5162a SR |
5552 | ret = 0; |
5553 | } | |
5554 | ||
bc0c38d1 SR |
5555 | for (t = trace_types; t; t = t->next) { |
5556 | if (strcmp(t->name, buf) == 0) | |
5557 | break; | |
5558 | } | |
c2931e05 FW |
5559 | if (!t) { |
5560 | ret = -EINVAL; | |
5561 | goto out; | |
5562 | } | |
2b6080f2 | 5563 | if (t == tr->current_trace) |
bc0c38d1 SR |
5564 | goto out; |
5565 | ||
a35873a0 TZ |
5566 | #ifdef CONFIG_TRACER_SNAPSHOT |
5567 | if (t->use_max_tr) { | |
5568 | arch_spin_lock(&tr->max_lock); | |
5569 | if (tr->cond_snapshot) | |
5570 | ret = -EBUSY; | |
5571 | arch_spin_unlock(&tr->max_lock); | |
5572 | if (ret) | |
5573 | goto out; | |
5574 | } | |
5575 | #endif | |
c7b3ae0b ZSZ |
5576 | /* Some tracers won't work on kernel command line */ |
5577 | if (system_state < SYSTEM_RUNNING && t->noboot) { | |
5578 | pr_warn("Tracer '%s' is not allowed on command line, ignored\n", | |
5579 | t->name); | |
5580 | goto out; | |
5581 | } | |
5582 | ||
607e2ea1 SRRH |
5583 | /* Some tracers are only allowed for the top level buffer */ |
5584 | if (!trace_ok_for_array(t, tr)) { | |
5585 | ret = -EINVAL; | |
5586 | goto out; | |
5587 | } | |
5588 | ||
cf6ab6d9 SRRH |
5589 | /* If trace pipe files are being read, we can't change the tracer */ |
5590 | if (tr->current_trace->ref) { | |
5591 | ret = -EBUSY; | |
5592 | goto out; | |
5593 | } | |
5594 | ||
9f029e83 | 5595 | trace_branch_disable(); |
613f04a0 | 5596 | |
50512ab5 | 5597 | tr->current_trace->enabled--; |
613f04a0 | 5598 | |
2b6080f2 SR |
5599 | if (tr->current_trace->reset) |
5600 | tr->current_trace->reset(tr); | |
34600f0e | 5601 | |
74401729 | 5602 | /* Current trace needs to be nop_trace before synchronize_rcu */ |
2b6080f2 | 5603 | tr->current_trace = &nop_trace; |
34600f0e | 5604 | |
45ad21ca SRRH |
5605 | #ifdef CONFIG_TRACER_MAX_TRACE |
5606 | had_max_tr = tr->allocated_snapshot; | |
34600f0e SR |
5607 | |
5608 | if (had_max_tr && !t->use_max_tr) { | |
5609 | /* | |
5610 | * We need to make sure that the update_max_tr sees that | |
5611 | * current_trace changed to nop_trace to keep it from | |
5612 | * swapping the buffers after we resize it. | |
5613 | * The update_max_tr is called from interrupts disabled | |
5614 | * so a synchronized_sched() is sufficient. | |
5615 | */ | |
74401729 | 5616 | synchronize_rcu(); |
3209cff4 | 5617 | free_snapshot(tr); |
ef710e10 | 5618 | } |
12883efb | 5619 | #endif |
12883efb SRRH |
5620 | |
5621 | #ifdef CONFIG_TRACER_MAX_TRACE | |
34600f0e | 5622 | if (t->use_max_tr && !had_max_tr) { |
2824f503 | 5623 | ret = tracing_alloc_snapshot_instance(tr); |
d60da506 HT |
5624 | if (ret < 0) |
5625 | goto out; | |
ef710e10 | 5626 | } |
12883efb | 5627 | #endif |
577b785f | 5628 | |
1c80025a | 5629 | if (t->init) { |
b6f11df2 | 5630 | ret = tracer_init(t, tr); |
1c80025a FW |
5631 | if (ret) |
5632 | goto out; | |
5633 | } | |
bc0c38d1 | 5634 | |
2b6080f2 | 5635 | tr->current_trace = t; |
50512ab5 | 5636 | tr->current_trace->enabled++; |
9f029e83 | 5637 | trace_branch_enable(tr); |
bc0c38d1 SR |
5638 | out: |
5639 | mutex_unlock(&trace_types_lock); | |
5640 | ||
d9e54076 PZ |
5641 | return ret; |
5642 | } | |
5643 | ||
5644 | static ssize_t | |
5645 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, | |
5646 | size_t cnt, loff_t *ppos) | |
5647 | { | |
607e2ea1 | 5648 | struct trace_array *tr = filp->private_data; |
ee6c2c1b | 5649 | char buf[MAX_TRACER_SIZE+1]; |
d9e54076 PZ |
5650 | int i; |
5651 | size_t ret; | |
e6e7a65a FW |
5652 | int err; |
5653 | ||
5654 | ret = cnt; | |
d9e54076 | 5655 | |
ee6c2c1b LZ |
5656 | if (cnt > MAX_TRACER_SIZE) |
5657 | cnt = MAX_TRACER_SIZE; | |
d9e54076 | 5658 | |
4afe6495 | 5659 | if (copy_from_user(buf, ubuf, cnt)) |
d9e54076 PZ |
5660 | return -EFAULT; |
5661 | ||
5662 | buf[cnt] = 0; | |
5663 | ||
5664 | /* strip ending whitespace. */ | |
5665 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) | |
5666 | buf[i] = 0; | |
5667 | ||
607e2ea1 | 5668 | err = tracing_set_tracer(tr, buf); |
e6e7a65a FW |
5669 | if (err) |
5670 | return err; | |
d9e54076 | 5671 | |
cf8517cf | 5672 | *ppos += ret; |
bc0c38d1 | 5673 | |
c2931e05 | 5674 | return ret; |
bc0c38d1 SR |
5675 | } |
5676 | ||
5677 | static ssize_t | |
6508fa76 SF |
5678 | tracing_nsecs_read(unsigned long *ptr, char __user *ubuf, |
5679 | size_t cnt, loff_t *ppos) | |
bc0c38d1 | 5680 | { |
bc0c38d1 SR |
5681 | char buf[64]; |
5682 | int r; | |
5683 | ||
cffae437 | 5684 | r = snprintf(buf, sizeof(buf), "%ld\n", |
bc0c38d1 | 5685 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
cffae437 SR |
5686 | if (r > sizeof(buf)) |
5687 | r = sizeof(buf); | |
4bf39a94 | 5688 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
5689 | } |
5690 | ||
5691 | static ssize_t | |
6508fa76 SF |
5692 | tracing_nsecs_write(unsigned long *ptr, const char __user *ubuf, |
5693 | size_t cnt, loff_t *ppos) | |
bc0c38d1 | 5694 | { |
5e39841c | 5695 | unsigned long val; |
c6caeeb1 | 5696 | int ret; |
bc0c38d1 | 5697 | |
22fe9b54 PH |
5698 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
5699 | if (ret) | |
c6caeeb1 | 5700 | return ret; |
bc0c38d1 SR |
5701 | |
5702 | *ptr = val * 1000; | |
5703 | ||
5704 | return cnt; | |
5705 | } | |
5706 | ||
6508fa76 SF |
5707 | static ssize_t |
5708 | tracing_thresh_read(struct file *filp, char __user *ubuf, | |
5709 | size_t cnt, loff_t *ppos) | |
5710 | { | |
5711 | return tracing_nsecs_read(&tracing_thresh, ubuf, cnt, ppos); | |
5712 | } | |
5713 | ||
5714 | static ssize_t | |
5715 | tracing_thresh_write(struct file *filp, const char __user *ubuf, | |
5716 | size_t cnt, loff_t *ppos) | |
5717 | { | |
5718 | struct trace_array *tr = filp->private_data; | |
5719 | int ret; | |
5720 | ||
5721 | mutex_lock(&trace_types_lock); | |
5722 | ret = tracing_nsecs_write(&tracing_thresh, ubuf, cnt, ppos); | |
5723 | if (ret < 0) | |
5724 | goto out; | |
5725 | ||
5726 | if (tr->current_trace->update_thresh) { | |
5727 | ret = tr->current_trace->update_thresh(tr); | |
5728 | if (ret < 0) | |
5729 | goto out; | |
5730 | } | |
5731 | ||
5732 | ret = cnt; | |
5733 | out: | |
5734 | mutex_unlock(&trace_types_lock); | |
5735 | ||
5736 | return ret; | |
5737 | } | |
5738 | ||
f971cc9a | 5739 | #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) |
e428abbb | 5740 | |
6508fa76 SF |
5741 | static ssize_t |
5742 | tracing_max_lat_read(struct file *filp, char __user *ubuf, | |
5743 | size_t cnt, loff_t *ppos) | |
5744 | { | |
5745 | return tracing_nsecs_read(filp->private_data, ubuf, cnt, ppos); | |
5746 | } | |
5747 | ||
5748 | static ssize_t | |
5749 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, | |
5750 | size_t cnt, loff_t *ppos) | |
5751 | { | |
5752 | return tracing_nsecs_write(filp->private_data, ubuf, cnt, ppos); | |
5753 | } | |
5754 | ||
e428abbb CG |
5755 | #endif |
5756 | ||
b3806b43 SR |
5757 | static int tracing_open_pipe(struct inode *inode, struct file *filp) |
5758 | { | |
15544209 | 5759 | struct trace_array *tr = inode->i_private; |
b3806b43 | 5760 | struct trace_iterator *iter; |
b04cc6b1 | 5761 | int ret = 0; |
b3806b43 SR |
5762 | |
5763 | if (tracing_disabled) | |
5764 | return -ENODEV; | |
5765 | ||
7b85af63 SRRH |
5766 | if (trace_array_get(tr) < 0) |
5767 | return -ENODEV; | |
5768 | ||
b04cc6b1 FW |
5769 | mutex_lock(&trace_types_lock); |
5770 | ||
b3806b43 SR |
5771 | /* create a buffer to store the information to pass to userspace */ |
5772 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); | |
b04cc6b1 FW |
5773 | if (!iter) { |
5774 | ret = -ENOMEM; | |
f77d09a3 | 5775 | __trace_array_put(tr); |
b04cc6b1 FW |
5776 | goto out; |
5777 | } | |
b3806b43 | 5778 | |
3a161d99 | 5779 | trace_seq_init(&iter->seq); |
d716ff71 | 5780 | iter->trace = tr->current_trace; |
d7350c3f | 5781 | |
4462344e | 5782 | if (!alloc_cpumask_var(&iter->started, GFP_KERNEL)) { |
b04cc6b1 | 5783 | ret = -ENOMEM; |
d7350c3f | 5784 | goto fail; |
4462344e RR |
5785 | } |
5786 | ||
a309720c | 5787 | /* trace pipe does not show start of buffer */ |
4462344e | 5788 | cpumask_setall(iter->started); |
a309720c | 5789 | |
983f938a | 5790 | if (tr->trace_flags & TRACE_ITER_LATENCY_FMT) |
112f38a7 SR |
5791 | iter->iter_flags |= TRACE_FILE_LAT_FMT; |
5792 | ||
8be0709f | 5793 | /* Output in nanoseconds only if we are using a clock in nanoseconds. */ |
58e8eedf | 5794 | if (trace_clocks[tr->clock_id].in_ns) |
8be0709f DS |
5795 | iter->iter_flags |= TRACE_FILE_TIME_IN_NS; |
5796 | ||
15544209 ON |
5797 | iter->tr = tr; |
5798 | iter->trace_buffer = &tr->trace_buffer; | |
5799 | iter->cpu_file = tracing_get_cpu(inode); | |
d7350c3f | 5800 | mutex_init(&iter->mutex); |
b3806b43 SR |
5801 | filp->private_data = iter; |
5802 | ||
107bad8b SR |
5803 | if (iter->trace->pipe_open) |
5804 | iter->trace->pipe_open(iter); | |
107bad8b | 5805 | |
b444786f | 5806 | nonseekable_open(inode, filp); |
cf6ab6d9 SRRH |
5807 | |
5808 | tr->current_trace->ref++; | |
b04cc6b1 FW |
5809 | out: |
5810 | mutex_unlock(&trace_types_lock); | |
5811 | return ret; | |
d7350c3f FW |
5812 | |
5813 | fail: | |
d7350c3f | 5814 | kfree(iter); |
7b85af63 | 5815 | __trace_array_put(tr); |
d7350c3f FW |
5816 | mutex_unlock(&trace_types_lock); |
5817 | return ret; | |
b3806b43 SR |
5818 | } |
5819 | ||
5820 | static int tracing_release_pipe(struct inode *inode, struct file *file) | |
5821 | { | |
5822 | struct trace_iterator *iter = file->private_data; | |
15544209 | 5823 | struct trace_array *tr = inode->i_private; |
b3806b43 | 5824 | |
b04cc6b1 FW |
5825 | mutex_lock(&trace_types_lock); |
5826 | ||
cf6ab6d9 SRRH |
5827 | tr->current_trace->ref--; |
5828 | ||
29bf4a5e | 5829 | if (iter->trace->pipe_close) |
c521efd1 SR |
5830 | iter->trace->pipe_close(iter); |
5831 | ||
b04cc6b1 FW |
5832 | mutex_unlock(&trace_types_lock); |
5833 | ||
4462344e | 5834 | free_cpumask_var(iter->started); |
d7350c3f | 5835 | mutex_destroy(&iter->mutex); |
b3806b43 | 5836 | kfree(iter); |
b3806b43 | 5837 | |
7b85af63 SRRH |
5838 | trace_array_put(tr); |
5839 | ||
b3806b43 SR |
5840 | return 0; |
5841 | } | |
5842 | ||
9dd95748 | 5843 | static __poll_t |
cc60cdc9 | 5844 | trace_poll(struct trace_iterator *iter, struct file *filp, poll_table *poll_table) |
2a2cc8f7 | 5845 | { |
983f938a SRRH |
5846 | struct trace_array *tr = iter->tr; |
5847 | ||
15693458 SRRH |
5848 | /* Iterators are static, they should be filled or empty */ |
5849 | if (trace_buffer_iter(iter, iter->cpu_file)) | |
a9a08845 | 5850 | return EPOLLIN | EPOLLRDNORM; |
2a2cc8f7 | 5851 | |
983f938a | 5852 | if (tr->trace_flags & TRACE_ITER_BLOCK) |
2a2cc8f7 SSP |
5853 | /* |
5854 | * Always select as readable when in blocking mode | |
5855 | */ | |
a9a08845 | 5856 | return EPOLLIN | EPOLLRDNORM; |
15693458 | 5857 | else |
12883efb | 5858 | return ring_buffer_poll_wait(iter->trace_buffer->buffer, iter->cpu_file, |
15693458 | 5859 | filp, poll_table); |
2a2cc8f7 | 5860 | } |
2a2cc8f7 | 5861 | |
9dd95748 | 5862 | static __poll_t |
cc60cdc9 SR |
5863 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) |
5864 | { | |
5865 | struct trace_iterator *iter = filp->private_data; | |
5866 | ||
5867 | return trace_poll(iter, filp, poll_table); | |
2a2cc8f7 SSP |
5868 | } |
5869 | ||
d716ff71 | 5870 | /* Must be called with iter->mutex held. */ |
ff98781b | 5871 | static int tracing_wait_pipe(struct file *filp) |
b3806b43 SR |
5872 | { |
5873 | struct trace_iterator *iter = filp->private_data; | |
8b8b3683 | 5874 | int ret; |
b3806b43 | 5875 | |
b3806b43 | 5876 | while (trace_empty(iter)) { |
2dc8f095 | 5877 | |
107bad8b | 5878 | if ((filp->f_flags & O_NONBLOCK)) { |
ff98781b | 5879 | return -EAGAIN; |
107bad8b | 5880 | } |
2dc8f095 | 5881 | |
b3806b43 | 5882 | /* |
250bfd3d | 5883 | * We block until we read something and tracing is disabled. |
b3806b43 SR |
5884 | * We still block if tracing is disabled, but we have never |
5885 | * read anything. This allows a user to cat this file, and | |
5886 | * then enable tracing. But after we have read something, | |
5887 | * we give an EOF when tracing is again disabled. | |
5888 | * | |
5889 | * iter->pos will be 0 if we haven't read anything. | |
5890 | */ | |
75df6e68 | 5891 | if (!tracer_tracing_is_on(iter->tr) && iter->pos) |
b3806b43 | 5892 | break; |
f4874261 SRRH |
5893 | |
5894 | mutex_unlock(&iter->mutex); | |
5895 | ||
2c2b0a78 | 5896 | ret = wait_on_pipe(iter, 0); |
f4874261 SRRH |
5897 | |
5898 | mutex_lock(&iter->mutex); | |
5899 | ||
8b8b3683 SRRH |
5900 | if (ret) |
5901 | return ret; | |
b3806b43 SR |
5902 | } |
5903 | ||
ff98781b EGM |
5904 | return 1; |
5905 | } | |
5906 | ||
5907 | /* | |
5908 | * Consumer reader. | |
5909 | */ | |
5910 | static ssize_t | |
5911 | tracing_read_pipe(struct file *filp, char __user *ubuf, | |
5912 | size_t cnt, loff_t *ppos) | |
5913 | { | |
5914 | struct trace_iterator *iter = filp->private_data; | |
5915 | ssize_t sret; | |
5916 | ||
d7350c3f FW |
5917 | /* |
5918 | * Avoid more than one consumer on a single file descriptor | |
5919 | * This is just a matter of traces coherency, the ring buffer itself | |
5920 | * is protected. | |
5921 | */ | |
5922 | mutex_lock(&iter->mutex); | |
1245800c SRRH |
5923 | |
5924 | /* return any leftover data */ | |
5925 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); | |
5926 | if (sret != -EBUSY) | |
5927 | goto out; | |
5928 | ||
5929 | trace_seq_init(&iter->seq); | |
5930 | ||
ff98781b EGM |
5931 | if (iter->trace->read) { |
5932 | sret = iter->trace->read(iter, filp, ubuf, cnt, ppos); | |
5933 | if (sret) | |
5934 | goto out; | |
5935 | } | |
5936 | ||
5937 | waitagain: | |
5938 | sret = tracing_wait_pipe(filp); | |
5939 | if (sret <= 0) | |
5940 | goto out; | |
5941 | ||
b3806b43 | 5942 | /* stop when tracing is finished */ |
ff98781b EGM |
5943 | if (trace_empty(iter)) { |
5944 | sret = 0; | |
107bad8b | 5945 | goto out; |
ff98781b | 5946 | } |
b3806b43 SR |
5947 | |
5948 | if (cnt >= PAGE_SIZE) | |
5949 | cnt = PAGE_SIZE - 1; | |
5950 | ||
53d0aa77 | 5951 | /* reset all but tr, trace, and overruns */ |
53d0aa77 SR |
5952 | memset(&iter->seq, 0, |
5953 | sizeof(struct trace_iterator) - | |
5954 | offsetof(struct trace_iterator, seq)); | |
ed5467da | 5955 | cpumask_clear(iter->started); |
4823ed7e | 5956 | iter->pos = -1; |
b3806b43 | 5957 | |
4f535968 | 5958 | trace_event_read_lock(); |
7e53bd42 | 5959 | trace_access_lock(iter->cpu_file); |
955b61e5 | 5960 | while (trace_find_next_entry_inc(iter) != NULL) { |
2c4f035f | 5961 | enum print_line_t ret; |
5ac48378 | 5962 | int save_len = iter->seq.seq.len; |
088b1e42 | 5963 | |
f9896bf3 | 5964 | ret = print_trace_line(iter); |
2c4f035f | 5965 | if (ret == TRACE_TYPE_PARTIAL_LINE) { |
088b1e42 | 5966 | /* don't print partial lines */ |
5ac48378 | 5967 | iter->seq.seq.len = save_len; |
b3806b43 | 5968 | break; |
088b1e42 | 5969 | } |
b91facc3 FW |
5970 | if (ret != TRACE_TYPE_NO_CONSUME) |
5971 | trace_consume(iter); | |
b3806b43 | 5972 | |
5ac48378 | 5973 | if (trace_seq_used(&iter->seq) >= cnt) |
b3806b43 | 5974 | break; |
ee5e51f5 JO |
5975 | |
5976 | /* | |
5977 | * Setting the full flag means we reached the trace_seq buffer | |
5978 | * size and we should leave by partial output condition above. | |
5979 | * One of the trace_seq_* functions is not used properly. | |
5980 | */ | |
5981 | WARN_ONCE(iter->seq.full, "full flag set for trace type %d", | |
5982 | iter->ent->type); | |
b3806b43 | 5983 | } |
7e53bd42 | 5984 | trace_access_unlock(iter->cpu_file); |
4f535968 | 5985 | trace_event_read_unlock(); |
b3806b43 | 5986 | |
b3806b43 | 5987 | /* Now copy what we have to the user */ |
6c6c2796 | 5988 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
5ac48378 | 5989 | if (iter->seq.seq.readpos >= trace_seq_used(&iter->seq)) |
f9520750 | 5990 | trace_seq_init(&iter->seq); |
9ff4b974 PP |
5991 | |
5992 | /* | |
25985edc | 5993 | * If there was nothing to send to user, in spite of consuming trace |
9ff4b974 PP |
5994 | * entries, go back to wait for more entries. |
5995 | */ | |
6c6c2796 | 5996 | if (sret == -EBUSY) |
9ff4b974 | 5997 | goto waitagain; |
b3806b43 | 5998 | |
107bad8b | 5999 | out: |
d7350c3f | 6000 | mutex_unlock(&iter->mutex); |
107bad8b | 6001 | |
6c6c2796 | 6002 | return sret; |
b3806b43 SR |
6003 | } |
6004 | ||
3c56819b EGM |
6005 | static void tracing_spd_release_pipe(struct splice_pipe_desc *spd, |
6006 | unsigned int idx) | |
6007 | { | |
6008 | __free_page(spd->pages[idx]); | |
6009 | } | |
6010 | ||
28dfef8f | 6011 | static const struct pipe_buf_operations tracing_pipe_buf_ops = { |
34cd4998 | 6012 | .can_merge = 0, |
34cd4998 | 6013 | .confirm = generic_pipe_buf_confirm, |
92fdd98c | 6014 | .release = generic_pipe_buf_release, |
34cd4998 SR |
6015 | .steal = generic_pipe_buf_steal, |
6016 | .get = generic_pipe_buf_get, | |
3c56819b EGM |
6017 | }; |
6018 | ||
34cd4998 | 6019 | static size_t |
fa7c7f6e | 6020 | tracing_fill_pipe_page(size_t rem, struct trace_iterator *iter) |
34cd4998 SR |
6021 | { |
6022 | size_t count; | |
74f06bb7 | 6023 | int save_len; |
34cd4998 SR |
6024 | int ret; |
6025 | ||
6026 | /* Seq buffer is page-sized, exactly what we need. */ | |
6027 | for (;;) { | |
74f06bb7 | 6028 | save_len = iter->seq.seq.len; |
34cd4998 | 6029 | ret = print_trace_line(iter); |
74f06bb7 SRRH |
6030 | |
6031 | if (trace_seq_has_overflowed(&iter->seq)) { | |
6032 | iter->seq.seq.len = save_len; | |
34cd4998 SR |
6033 | break; |
6034 | } | |
74f06bb7 SRRH |
6035 | |
6036 | /* | |
6037 | * This should not be hit, because it should only | |
6038 | * be set if the iter->seq overflowed. But check it | |
6039 | * anyway to be safe. | |
6040 | */ | |
34cd4998 | 6041 | if (ret == TRACE_TYPE_PARTIAL_LINE) { |
74f06bb7 SRRH |
6042 | iter->seq.seq.len = save_len; |
6043 | break; | |
6044 | } | |
6045 | ||
5ac48378 | 6046 | count = trace_seq_used(&iter->seq) - save_len; |
74f06bb7 SRRH |
6047 | if (rem < count) { |
6048 | rem = 0; | |
6049 | iter->seq.seq.len = save_len; | |
34cd4998 SR |
6050 | break; |
6051 | } | |
6052 | ||
74e7ff8c LJ |
6053 | if (ret != TRACE_TYPE_NO_CONSUME) |
6054 | trace_consume(iter); | |
34cd4998 | 6055 | rem -= count; |
955b61e5 | 6056 | if (!trace_find_next_entry_inc(iter)) { |
34cd4998 SR |
6057 | rem = 0; |
6058 | iter->ent = NULL; | |
6059 | break; | |
6060 | } | |
6061 | } | |
6062 | ||
6063 | return rem; | |
6064 | } | |
6065 | ||
3c56819b EGM |
6066 | static ssize_t tracing_splice_read_pipe(struct file *filp, |
6067 | loff_t *ppos, | |
6068 | struct pipe_inode_info *pipe, | |
6069 | size_t len, | |
6070 | unsigned int flags) | |
6071 | { | |
35f3d14d JA |
6072 | struct page *pages_def[PIPE_DEF_BUFFERS]; |
6073 | struct partial_page partial_def[PIPE_DEF_BUFFERS]; | |
3c56819b EGM |
6074 | struct trace_iterator *iter = filp->private_data; |
6075 | struct splice_pipe_desc spd = { | |
35f3d14d JA |
6076 | .pages = pages_def, |
6077 | .partial = partial_def, | |
34cd4998 | 6078 | .nr_pages = 0, /* This gets updated below. */ |
047fe360 | 6079 | .nr_pages_max = PIPE_DEF_BUFFERS, |
34cd4998 SR |
6080 | .ops = &tracing_pipe_buf_ops, |
6081 | .spd_release = tracing_spd_release_pipe, | |
3c56819b EGM |
6082 | }; |
6083 | ssize_t ret; | |
34cd4998 | 6084 | size_t rem; |
3c56819b EGM |
6085 | unsigned int i; |
6086 | ||
35f3d14d JA |
6087 | if (splice_grow_spd(pipe, &spd)) |
6088 | return -ENOMEM; | |
6089 | ||
d7350c3f | 6090 | mutex_lock(&iter->mutex); |
3c56819b EGM |
6091 | |
6092 | if (iter->trace->splice_read) { | |
6093 | ret = iter->trace->splice_read(iter, filp, | |
6094 | ppos, pipe, len, flags); | |
6095 | if (ret) | |
34cd4998 | 6096 | goto out_err; |
3c56819b EGM |
6097 | } |
6098 | ||
6099 | ret = tracing_wait_pipe(filp); | |
6100 | if (ret <= 0) | |
34cd4998 | 6101 | goto out_err; |
3c56819b | 6102 | |
955b61e5 | 6103 | if (!iter->ent && !trace_find_next_entry_inc(iter)) { |
3c56819b | 6104 | ret = -EFAULT; |
34cd4998 | 6105 | goto out_err; |
3c56819b EGM |
6106 | } |
6107 | ||
4f535968 | 6108 | trace_event_read_lock(); |
7e53bd42 | 6109 | trace_access_lock(iter->cpu_file); |
4f535968 | 6110 | |
3c56819b | 6111 | /* Fill as many pages as possible. */ |
a786c06d | 6112 | for (i = 0, rem = len; i < spd.nr_pages_max && rem; i++) { |
35f3d14d JA |
6113 | spd.pages[i] = alloc_page(GFP_KERNEL); |
6114 | if (!spd.pages[i]) | |
34cd4998 | 6115 | break; |
3c56819b | 6116 | |
fa7c7f6e | 6117 | rem = tracing_fill_pipe_page(rem, iter); |
3c56819b EGM |
6118 | |
6119 | /* Copy the data into the page, so we can start over. */ | |
6120 | ret = trace_seq_to_buffer(&iter->seq, | |
35f3d14d | 6121 | page_address(spd.pages[i]), |
5ac48378 | 6122 | trace_seq_used(&iter->seq)); |
3c56819b | 6123 | if (ret < 0) { |
35f3d14d | 6124 | __free_page(spd.pages[i]); |
3c56819b EGM |
6125 | break; |
6126 | } | |
35f3d14d | 6127 | spd.partial[i].offset = 0; |
5ac48378 | 6128 | spd.partial[i].len = trace_seq_used(&iter->seq); |
3c56819b | 6129 | |
f9520750 | 6130 | trace_seq_init(&iter->seq); |
3c56819b EGM |
6131 | } |
6132 | ||
7e53bd42 | 6133 | trace_access_unlock(iter->cpu_file); |
4f535968 | 6134 | trace_event_read_unlock(); |
d7350c3f | 6135 | mutex_unlock(&iter->mutex); |
3c56819b EGM |
6136 | |
6137 | spd.nr_pages = i; | |
6138 | ||
a29054d9 SRRH |
6139 | if (i) |
6140 | ret = splice_to_pipe(pipe, &spd); | |
6141 | else | |
6142 | ret = 0; | |
35f3d14d | 6143 | out: |
047fe360 | 6144 | splice_shrink_spd(&spd); |
35f3d14d | 6145 | return ret; |
3c56819b | 6146 | |
34cd4998 | 6147 | out_err: |
d7350c3f | 6148 | mutex_unlock(&iter->mutex); |
35f3d14d | 6149 | goto out; |
3c56819b EGM |
6150 | } |
6151 | ||
a98a3c3f SR |
6152 | static ssize_t |
6153 | tracing_entries_read(struct file *filp, char __user *ubuf, | |
6154 | size_t cnt, loff_t *ppos) | |
6155 | { | |
0bc392ee ON |
6156 | struct inode *inode = file_inode(filp); |
6157 | struct trace_array *tr = inode->i_private; | |
6158 | int cpu = tracing_get_cpu(inode); | |
438ced17 VN |
6159 | char buf[64]; |
6160 | int r = 0; | |
6161 | ssize_t ret; | |
a98a3c3f | 6162 | |
db526ca3 | 6163 | mutex_lock(&trace_types_lock); |
438ced17 | 6164 | |
0bc392ee | 6165 | if (cpu == RING_BUFFER_ALL_CPUS) { |
438ced17 VN |
6166 | int cpu, buf_size_same; |
6167 | unsigned long size; | |
6168 | ||
6169 | size = 0; | |
6170 | buf_size_same = 1; | |
6171 | /* check if all cpu sizes are same */ | |
6172 | for_each_tracing_cpu(cpu) { | |
6173 | /* fill in the size from first enabled cpu */ | |
6174 | if (size == 0) | |
12883efb SRRH |
6175 | size = per_cpu_ptr(tr->trace_buffer.data, cpu)->entries; |
6176 | if (size != per_cpu_ptr(tr->trace_buffer.data, cpu)->entries) { | |
438ced17 VN |
6177 | buf_size_same = 0; |
6178 | break; | |
6179 | } | |
6180 | } | |
6181 | ||
6182 | if (buf_size_same) { | |
6183 | if (!ring_buffer_expanded) | |
6184 | r = sprintf(buf, "%lu (expanded: %lu)\n", | |
6185 | size >> 10, | |
6186 | trace_buf_size >> 10); | |
6187 | else | |
6188 | r = sprintf(buf, "%lu\n", size >> 10); | |
6189 | } else | |
6190 | r = sprintf(buf, "X\n"); | |
6191 | } else | |
0bc392ee | 6192 | r = sprintf(buf, "%lu\n", per_cpu_ptr(tr->trace_buffer.data, cpu)->entries >> 10); |
438ced17 | 6193 | |
db526ca3 SR |
6194 | mutex_unlock(&trace_types_lock); |
6195 | ||
438ced17 VN |
6196 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
6197 | return ret; | |
a98a3c3f SR |
6198 | } |
6199 | ||
6200 | static ssize_t | |
6201 | tracing_entries_write(struct file *filp, const char __user *ubuf, | |
6202 | size_t cnt, loff_t *ppos) | |
6203 | { | |
0bc392ee ON |
6204 | struct inode *inode = file_inode(filp); |
6205 | struct trace_array *tr = inode->i_private; | |
a98a3c3f | 6206 | unsigned long val; |
4f271a2a | 6207 | int ret; |
a98a3c3f | 6208 | |
22fe9b54 PH |
6209 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
6210 | if (ret) | |
c6caeeb1 | 6211 | return ret; |
a98a3c3f SR |
6212 | |
6213 | /* must have at least 1 entry */ | |
6214 | if (!val) | |
6215 | return -EINVAL; | |
6216 | ||
1696b2b0 SR |
6217 | /* value is in KB */ |
6218 | val <<= 10; | |
0bc392ee | 6219 | ret = tracing_resize_ring_buffer(tr, val, tracing_get_cpu(inode)); |
4f271a2a VN |
6220 | if (ret < 0) |
6221 | return ret; | |
a98a3c3f | 6222 | |
cf8517cf | 6223 | *ppos += cnt; |
a98a3c3f | 6224 | |
4f271a2a VN |
6225 | return cnt; |
6226 | } | |
bf5e6519 | 6227 | |
f81ab074 VN |
6228 | static ssize_t |
6229 | tracing_total_entries_read(struct file *filp, char __user *ubuf, | |
6230 | size_t cnt, loff_t *ppos) | |
6231 | { | |
6232 | struct trace_array *tr = filp->private_data; | |
6233 | char buf[64]; | |
6234 | int r, cpu; | |
6235 | unsigned long size = 0, expanded_size = 0; | |
6236 | ||
6237 | mutex_lock(&trace_types_lock); | |
6238 | for_each_tracing_cpu(cpu) { | |
12883efb | 6239 | size += per_cpu_ptr(tr->trace_buffer.data, cpu)->entries >> 10; |
f81ab074 VN |
6240 | if (!ring_buffer_expanded) |
6241 | expanded_size += trace_buf_size >> 10; | |
6242 | } | |
6243 | if (ring_buffer_expanded) | |
6244 | r = sprintf(buf, "%lu\n", size); | |
6245 | else | |
6246 | r = sprintf(buf, "%lu (expanded: %lu)\n", size, expanded_size); | |
6247 | mutex_unlock(&trace_types_lock); | |
6248 | ||
6249 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
6250 | } | |
6251 | ||
4f271a2a VN |
6252 | static ssize_t |
6253 | tracing_free_buffer_write(struct file *filp, const char __user *ubuf, | |
6254 | size_t cnt, loff_t *ppos) | |
6255 | { | |
6256 | /* | |
6257 | * There is no need to read what the user has written, this function | |
6258 | * is just to make sure that there is no error when "echo" is used | |
6259 | */ | |
6260 | ||
6261 | *ppos += cnt; | |
a98a3c3f SR |
6262 | |
6263 | return cnt; | |
6264 | } | |
6265 | ||
4f271a2a VN |
6266 | static int |
6267 | tracing_free_buffer_release(struct inode *inode, struct file *filp) | |
6268 | { | |
2b6080f2 SR |
6269 | struct trace_array *tr = inode->i_private; |
6270 | ||
cf30cf67 | 6271 | /* disable tracing ? */ |
983f938a | 6272 | if (tr->trace_flags & TRACE_ITER_STOP_ON_FREE) |
711e1243 | 6273 | tracer_tracing_off(tr); |
4f271a2a | 6274 | /* resize the ring buffer to 0 */ |
2b6080f2 | 6275 | tracing_resize_ring_buffer(tr, 0, RING_BUFFER_ALL_CPUS); |
4f271a2a | 6276 | |
7b85af63 SRRH |
6277 | trace_array_put(tr); |
6278 | ||
4f271a2a VN |
6279 | return 0; |
6280 | } | |
6281 | ||
5bf9a1ee PP |
6282 | static ssize_t |
6283 | tracing_mark_write(struct file *filp, const char __user *ubuf, | |
6284 | size_t cnt, loff_t *fpos) | |
6285 | { | |
2d71619c | 6286 | struct trace_array *tr = filp->private_data; |
d696b58c | 6287 | struct ring_buffer_event *event; |
3dd80953 | 6288 | enum event_trigger_type tt = ETT_NONE; |
d696b58c SR |
6289 | struct ring_buffer *buffer; |
6290 | struct print_entry *entry; | |
6291 | unsigned long irq_flags; | |
656c7f0d | 6292 | const char faulted[] = "<faulted>"; |
d696b58c | 6293 | ssize_t written; |
d696b58c SR |
6294 | int size; |
6295 | int len; | |
fa32e855 | 6296 | |
656c7f0d SRRH |
6297 | /* Used in tracing_mark_raw_write() as well */ |
6298 | #define FAULTED_SIZE (sizeof(faulted) - 1) /* '\0' is already accounted for */ | |
5bf9a1ee | 6299 | |
c76f0694 | 6300 | if (tracing_disabled) |
5bf9a1ee PP |
6301 | return -EINVAL; |
6302 | ||
983f938a | 6303 | if (!(tr->trace_flags & TRACE_ITER_MARKERS)) |
5224c3a3 MSB |
6304 | return -EINVAL; |
6305 | ||
5bf9a1ee PP |
6306 | if (cnt > TRACE_BUF_SIZE) |
6307 | cnt = TRACE_BUF_SIZE; | |
6308 | ||
d696b58c | 6309 | BUILD_BUG_ON(TRACE_BUF_SIZE >= PAGE_SIZE); |
5bf9a1ee | 6310 | |
d696b58c | 6311 | local_save_flags(irq_flags); |
656c7f0d | 6312 | size = sizeof(*entry) + cnt + 2; /* add '\0' and possible '\n' */ |
d696b58c | 6313 | |
656c7f0d SRRH |
6314 | /* If less than "<faulted>", then make sure we can still add that */ |
6315 | if (cnt < FAULTED_SIZE) | |
6316 | size += FAULTED_SIZE - cnt; | |
d696b58c | 6317 | |
2d71619c | 6318 | buffer = tr->trace_buffer.buffer; |
3e9a8aad SRRH |
6319 | event = __trace_buffer_lock_reserve(buffer, TRACE_PRINT, size, |
6320 | irq_flags, preempt_count()); | |
656c7f0d | 6321 | if (unlikely(!event)) |
d696b58c | 6322 | /* Ring buffer disabled, return as if not open for write */ |
656c7f0d | 6323 | return -EBADF; |
d696b58c SR |
6324 | |
6325 | entry = ring_buffer_event_data(event); | |
6326 | entry->ip = _THIS_IP_; | |
6327 | ||
656c7f0d SRRH |
6328 | len = __copy_from_user_inatomic(&entry->buf, ubuf, cnt); |
6329 | if (len) { | |
6330 | memcpy(&entry->buf, faulted, FAULTED_SIZE); | |
6331 | cnt = FAULTED_SIZE; | |
6332 | written = -EFAULT; | |
c13d2f7c | 6333 | } else |
656c7f0d SRRH |
6334 | written = cnt; |
6335 | len = cnt; | |
5bf9a1ee | 6336 | |
3dd80953 SRV |
6337 | if (tr->trace_marker_file && !list_empty(&tr->trace_marker_file->triggers)) { |
6338 | /* do not add \n before testing triggers, but add \0 */ | |
6339 | entry->buf[cnt] = '\0'; | |
6340 | tt = event_triggers_call(tr->trace_marker_file, entry, event); | |
6341 | } | |
6342 | ||
d696b58c SR |
6343 | if (entry->buf[cnt - 1] != '\n') { |
6344 | entry->buf[cnt] = '\n'; | |
6345 | entry->buf[cnt + 1] = '\0'; | |
6346 | } else | |
6347 | entry->buf[cnt] = '\0'; | |
6348 | ||
7ffbd48d | 6349 | __buffer_unlock_commit(buffer, event); |
5bf9a1ee | 6350 | |
3dd80953 SRV |
6351 | if (tt) |
6352 | event_triggers_post_call(tr->trace_marker_file, tt); | |
6353 | ||
656c7f0d SRRH |
6354 | if (written > 0) |
6355 | *fpos += written; | |
5bf9a1ee | 6356 | |
fa32e855 SR |
6357 | return written; |
6358 | } | |
6359 | ||
6360 | /* Limit it for now to 3K (including tag) */ | |
6361 | #define RAW_DATA_MAX_SIZE (1024*3) | |
6362 | ||
6363 | static ssize_t | |
6364 | tracing_mark_raw_write(struct file *filp, const char __user *ubuf, | |
6365 | size_t cnt, loff_t *fpos) | |
6366 | { | |
6367 | struct trace_array *tr = filp->private_data; | |
6368 | struct ring_buffer_event *event; | |
6369 | struct ring_buffer *buffer; | |
6370 | struct raw_data_entry *entry; | |
656c7f0d | 6371 | const char faulted[] = "<faulted>"; |
fa32e855 | 6372 | unsigned long irq_flags; |
fa32e855 | 6373 | ssize_t written; |
fa32e855 SR |
6374 | int size; |
6375 | int len; | |
6376 | ||
656c7f0d SRRH |
6377 | #define FAULT_SIZE_ID (FAULTED_SIZE + sizeof(int)) |
6378 | ||
fa32e855 SR |
6379 | if (tracing_disabled) |
6380 | return -EINVAL; | |
6381 | ||
6382 | if (!(tr->trace_flags & TRACE_ITER_MARKERS)) | |
6383 | return -EINVAL; | |
6384 | ||
6385 | /* The marker must at least have a tag id */ | |
6386 | if (cnt < sizeof(unsigned int) || cnt > RAW_DATA_MAX_SIZE) | |
6387 | return -EINVAL; | |
6388 | ||
6389 | if (cnt > TRACE_BUF_SIZE) | |
6390 | cnt = TRACE_BUF_SIZE; | |
6391 | ||
6392 | BUILD_BUG_ON(TRACE_BUF_SIZE >= PAGE_SIZE); | |
6393 | ||
fa32e855 SR |
6394 | local_save_flags(irq_flags); |
6395 | size = sizeof(*entry) + cnt; | |
656c7f0d SRRH |
6396 | if (cnt < FAULT_SIZE_ID) |
6397 | size += FAULT_SIZE_ID - cnt; | |
6398 | ||
fa32e855 | 6399 | buffer = tr->trace_buffer.buffer; |
3e9a8aad SRRH |
6400 | event = __trace_buffer_lock_reserve(buffer, TRACE_RAW_DATA, size, |
6401 | irq_flags, preempt_count()); | |
656c7f0d | 6402 | if (!event) |
fa32e855 | 6403 | /* Ring buffer disabled, return as if not open for write */ |
656c7f0d | 6404 | return -EBADF; |
fa32e855 SR |
6405 | |
6406 | entry = ring_buffer_event_data(event); | |
6407 | ||
656c7f0d SRRH |
6408 | len = __copy_from_user_inatomic(&entry->id, ubuf, cnt); |
6409 | if (len) { | |
6410 | entry->id = -1; | |
6411 | memcpy(&entry->buf, faulted, FAULTED_SIZE); | |
6412 | written = -EFAULT; | |
fa32e855 | 6413 | } else |
656c7f0d | 6414 | written = cnt; |
fa32e855 SR |
6415 | |
6416 | __buffer_unlock_commit(buffer, event); | |
6417 | ||
656c7f0d SRRH |
6418 | if (written > 0) |
6419 | *fpos += written; | |
1aa54bca MS |
6420 | |
6421 | return written; | |
5bf9a1ee PP |
6422 | } |
6423 | ||
13f16d20 | 6424 | static int tracing_clock_show(struct seq_file *m, void *v) |
5079f326 | 6425 | { |
2b6080f2 | 6426 | struct trace_array *tr = m->private; |
5079f326 Z |
6427 | int i; |
6428 | ||
6429 | for (i = 0; i < ARRAY_SIZE(trace_clocks); i++) | |
13f16d20 | 6430 | seq_printf(m, |
5079f326 | 6431 | "%s%s%s%s", i ? " " : "", |
2b6080f2 SR |
6432 | i == tr->clock_id ? "[" : "", trace_clocks[i].name, |
6433 | i == tr->clock_id ? "]" : ""); | |
13f16d20 | 6434 | seq_putc(m, '\n'); |
5079f326 | 6435 | |
13f16d20 | 6436 | return 0; |
5079f326 Z |
6437 | } |
6438 | ||
d71bd34d | 6439 | int tracing_set_clock(struct trace_array *tr, const char *clockstr) |
5079f326 | 6440 | { |
5079f326 Z |
6441 | int i; |
6442 | ||
5079f326 Z |
6443 | for (i = 0; i < ARRAY_SIZE(trace_clocks); i++) { |
6444 | if (strcmp(trace_clocks[i].name, clockstr) == 0) | |
6445 | break; | |
6446 | } | |
6447 | if (i == ARRAY_SIZE(trace_clocks)) | |
6448 | return -EINVAL; | |
6449 | ||
5079f326 Z |
6450 | mutex_lock(&trace_types_lock); |
6451 | ||
2b6080f2 SR |
6452 | tr->clock_id = i; |
6453 | ||
12883efb | 6454 | ring_buffer_set_clock(tr->trace_buffer.buffer, trace_clocks[i].func); |
5079f326 | 6455 | |
60303ed3 DS |
6456 | /* |
6457 | * New clock may not be consistent with the previous clock. | |
6458 | * Reset the buffer so that it doesn't have incomparable timestamps. | |
6459 | */ | |
9457158b | 6460 | tracing_reset_online_cpus(&tr->trace_buffer); |
12883efb SRRH |
6461 | |
6462 | #ifdef CONFIG_TRACER_MAX_TRACE | |
170b3b10 | 6463 | if (tr->max_buffer.buffer) |
12883efb | 6464 | ring_buffer_set_clock(tr->max_buffer.buffer, trace_clocks[i].func); |
9457158b | 6465 | tracing_reset_online_cpus(&tr->max_buffer); |
12883efb | 6466 | #endif |
60303ed3 | 6467 | |
5079f326 Z |
6468 | mutex_unlock(&trace_types_lock); |
6469 | ||
e1e232ca SR |
6470 | return 0; |
6471 | } | |
6472 | ||
6473 | static ssize_t tracing_clock_write(struct file *filp, const char __user *ubuf, | |
6474 | size_t cnt, loff_t *fpos) | |
6475 | { | |
6476 | struct seq_file *m = filp->private_data; | |
6477 | struct trace_array *tr = m->private; | |
6478 | char buf[64]; | |
6479 | const char *clockstr; | |
6480 | int ret; | |
6481 | ||
6482 | if (cnt >= sizeof(buf)) | |
6483 | return -EINVAL; | |
6484 | ||
4afe6495 | 6485 | if (copy_from_user(buf, ubuf, cnt)) |
e1e232ca SR |
6486 | return -EFAULT; |
6487 | ||
6488 | buf[cnt] = 0; | |
6489 | ||
6490 | clockstr = strstrip(buf); | |
6491 | ||
6492 | ret = tracing_set_clock(tr, clockstr); | |
6493 | if (ret) | |
6494 | return ret; | |
6495 | ||
5079f326 Z |
6496 | *fpos += cnt; |
6497 | ||
6498 | return cnt; | |
6499 | } | |
6500 | ||
13f16d20 LZ |
6501 | static int tracing_clock_open(struct inode *inode, struct file *file) |
6502 | { | |
7b85af63 SRRH |
6503 | struct trace_array *tr = inode->i_private; |
6504 | int ret; | |
6505 | ||
13f16d20 LZ |
6506 | if (tracing_disabled) |
6507 | return -ENODEV; | |
2b6080f2 | 6508 | |
7b85af63 SRRH |
6509 | if (trace_array_get(tr)) |
6510 | return -ENODEV; | |
6511 | ||
6512 | ret = single_open(file, tracing_clock_show, inode->i_private); | |
6513 | if (ret < 0) | |
6514 | trace_array_put(tr); | |
6515 | ||
6516 | return ret; | |
13f16d20 LZ |
6517 | } |
6518 | ||
2c1ea60b TZ |
6519 | static int tracing_time_stamp_mode_show(struct seq_file *m, void *v) |
6520 | { | |
6521 | struct trace_array *tr = m->private; | |
6522 | ||
6523 | mutex_lock(&trace_types_lock); | |
6524 | ||
6525 | if (ring_buffer_time_stamp_abs(tr->trace_buffer.buffer)) | |
6526 | seq_puts(m, "delta [absolute]\n"); | |
6527 | else | |
6528 | seq_puts(m, "[delta] absolute\n"); | |
6529 | ||
6530 | mutex_unlock(&trace_types_lock); | |
6531 | ||
6532 | return 0; | |
6533 | } | |
6534 | ||
6535 | static int tracing_time_stamp_mode_open(struct inode *inode, struct file *file) | |
6536 | { | |
6537 | struct trace_array *tr = inode->i_private; | |
6538 | int ret; | |
6539 | ||
6540 | if (tracing_disabled) | |
6541 | return -ENODEV; | |
6542 | ||
6543 | if (trace_array_get(tr)) | |
6544 | return -ENODEV; | |
6545 | ||
6546 | ret = single_open(file, tracing_time_stamp_mode_show, inode->i_private); | |
6547 | if (ret < 0) | |
6548 | trace_array_put(tr); | |
6549 | ||
6550 | return ret; | |
6551 | } | |
6552 | ||
00b41452 TZ |
6553 | int tracing_set_time_stamp_abs(struct trace_array *tr, bool abs) |
6554 | { | |
6555 | int ret = 0; | |
6556 | ||
6557 | mutex_lock(&trace_types_lock); | |
6558 | ||
6559 | if (abs && tr->time_stamp_abs_ref++) | |
6560 | goto out; | |
6561 | ||
6562 | if (!abs) { | |
6563 | if (WARN_ON_ONCE(!tr->time_stamp_abs_ref)) { | |
6564 | ret = -EINVAL; | |
6565 | goto out; | |
6566 | } | |
6567 | ||
6568 | if (--tr->time_stamp_abs_ref) | |
6569 | goto out; | |
6570 | } | |
6571 | ||
6572 | ring_buffer_set_time_stamp_abs(tr->trace_buffer.buffer, abs); | |
6573 | ||
6574 | #ifdef CONFIG_TRACER_MAX_TRACE | |
6575 | if (tr->max_buffer.buffer) | |
6576 | ring_buffer_set_time_stamp_abs(tr->max_buffer.buffer, abs); | |
6577 | #endif | |
6578 | out: | |
6579 | mutex_unlock(&trace_types_lock); | |
6580 | ||
6581 | return ret; | |
6582 | } | |
6583 | ||
6de58e62 SRRH |
6584 | struct ftrace_buffer_info { |
6585 | struct trace_iterator iter; | |
6586 | void *spare; | |
73a757e6 | 6587 | unsigned int spare_cpu; |
6de58e62 SRRH |
6588 | unsigned int read; |
6589 | }; | |
6590 | ||
debdd57f HT |
6591 | #ifdef CONFIG_TRACER_SNAPSHOT |
6592 | static int tracing_snapshot_open(struct inode *inode, struct file *file) | |
6593 | { | |
6484c71c | 6594 | struct trace_array *tr = inode->i_private; |
debdd57f | 6595 | struct trace_iterator *iter; |
2b6080f2 | 6596 | struct seq_file *m; |
debdd57f HT |
6597 | int ret = 0; |
6598 | ||
ff451961 SRRH |
6599 | if (trace_array_get(tr) < 0) |
6600 | return -ENODEV; | |
6601 | ||
debdd57f | 6602 | if (file->f_mode & FMODE_READ) { |
6484c71c | 6603 | iter = __tracing_open(inode, file, true); |
debdd57f HT |
6604 | if (IS_ERR(iter)) |
6605 | ret = PTR_ERR(iter); | |
2b6080f2 SR |
6606 | } else { |
6607 | /* Writes still need the seq_file to hold the private data */ | |
f77d09a3 | 6608 | ret = -ENOMEM; |
2b6080f2 SR |
6609 | m = kzalloc(sizeof(*m), GFP_KERNEL); |
6610 | if (!m) | |
f77d09a3 | 6611 | goto out; |
2b6080f2 SR |
6612 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
6613 | if (!iter) { | |
6614 | kfree(m); | |
f77d09a3 | 6615 | goto out; |
2b6080f2 | 6616 | } |
f77d09a3 AL |
6617 | ret = 0; |
6618 | ||
ff451961 | 6619 | iter->tr = tr; |
6484c71c ON |
6620 | iter->trace_buffer = &tr->max_buffer; |
6621 | iter->cpu_file = tracing_get_cpu(inode); | |
2b6080f2 SR |
6622 | m->private = iter; |
6623 | file->private_data = m; | |
debdd57f | 6624 | } |
f77d09a3 | 6625 | out: |
ff451961 SRRH |
6626 | if (ret < 0) |
6627 | trace_array_put(tr); | |
6628 | ||
debdd57f HT |
6629 | return ret; |
6630 | } | |
6631 | ||
6632 | static ssize_t | |
6633 | tracing_snapshot_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
6634 | loff_t *ppos) | |
6635 | { | |
2b6080f2 SR |
6636 | struct seq_file *m = filp->private_data; |
6637 | struct trace_iterator *iter = m->private; | |
6638 | struct trace_array *tr = iter->tr; | |
debdd57f HT |
6639 | unsigned long val; |
6640 | int ret; | |
6641 | ||
6642 | ret = tracing_update_buffers(); | |
6643 | if (ret < 0) | |
6644 | return ret; | |
6645 | ||
6646 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); | |
6647 | if (ret) | |
6648 | return ret; | |
6649 | ||
6650 | mutex_lock(&trace_types_lock); | |
6651 | ||
2b6080f2 | 6652 | if (tr->current_trace->use_max_tr) { |
debdd57f HT |
6653 | ret = -EBUSY; |
6654 | goto out; | |
6655 | } | |
6656 | ||
a35873a0 TZ |
6657 | arch_spin_lock(&tr->max_lock); |
6658 | if (tr->cond_snapshot) | |
6659 | ret = -EBUSY; | |
6660 | arch_spin_unlock(&tr->max_lock); | |
6661 | if (ret) | |
6662 | goto out; | |
6663 | ||
debdd57f HT |
6664 | switch (val) { |
6665 | case 0: | |
f1affcaa SRRH |
6666 | if (iter->cpu_file != RING_BUFFER_ALL_CPUS) { |
6667 | ret = -EINVAL; | |
6668 | break; | |
debdd57f | 6669 | } |
3209cff4 SRRH |
6670 | if (tr->allocated_snapshot) |
6671 | free_snapshot(tr); | |
debdd57f HT |
6672 | break; |
6673 | case 1: | |
f1affcaa SRRH |
6674 | /* Only allow per-cpu swap if the ring buffer supports it */ |
6675 | #ifndef CONFIG_RING_BUFFER_ALLOW_SWAP | |
6676 | if (iter->cpu_file != RING_BUFFER_ALL_CPUS) { | |
6677 | ret = -EINVAL; | |
6678 | break; | |
6679 | } | |
6680 | #endif | |
45ad21ca | 6681 | if (!tr->allocated_snapshot) { |
2824f503 | 6682 | ret = tracing_alloc_snapshot_instance(tr); |
debdd57f HT |
6683 | if (ret < 0) |
6684 | break; | |
debdd57f | 6685 | } |
debdd57f HT |
6686 | local_irq_disable(); |
6687 | /* Now, we're going to swap */ | |
f1affcaa | 6688 | if (iter->cpu_file == RING_BUFFER_ALL_CPUS) |
a35873a0 | 6689 | update_max_tr(tr, current, smp_processor_id(), NULL); |
f1affcaa | 6690 | else |
ce9bae55 | 6691 | update_max_tr_single(tr, current, iter->cpu_file); |
debdd57f HT |
6692 | local_irq_enable(); |
6693 | break; | |
6694 | default: | |
45ad21ca | 6695 | if (tr->allocated_snapshot) { |
f1affcaa SRRH |
6696 | if (iter->cpu_file == RING_BUFFER_ALL_CPUS) |
6697 | tracing_reset_online_cpus(&tr->max_buffer); | |
6698 | else | |
6699 | tracing_reset(&tr->max_buffer, iter->cpu_file); | |
6700 | } | |
debdd57f HT |
6701 | break; |
6702 | } | |
6703 | ||
6704 | if (ret >= 0) { | |
6705 | *ppos += cnt; | |
6706 | ret = cnt; | |
6707 | } | |
6708 | out: | |
6709 | mutex_unlock(&trace_types_lock); | |
6710 | return ret; | |
6711 | } | |
2b6080f2 SR |
6712 | |
6713 | static int tracing_snapshot_release(struct inode *inode, struct file *file) | |
6714 | { | |
6715 | struct seq_file *m = file->private_data; | |
ff451961 SRRH |
6716 | int ret; |
6717 | ||
6718 | ret = tracing_release(inode, file); | |
2b6080f2 SR |
6719 | |
6720 | if (file->f_mode & FMODE_READ) | |
ff451961 | 6721 | return ret; |
2b6080f2 SR |
6722 | |
6723 | /* If write only, the seq_file is just a stub */ | |
6724 | if (m) | |
6725 | kfree(m->private); | |
6726 | kfree(m); | |
6727 | ||
6728 | return 0; | |
6729 | } | |
6730 | ||
6de58e62 SRRH |
6731 | static int tracing_buffers_open(struct inode *inode, struct file *filp); |
6732 | static ssize_t tracing_buffers_read(struct file *filp, char __user *ubuf, | |
6733 | size_t count, loff_t *ppos); | |
6734 | static int tracing_buffers_release(struct inode *inode, struct file *file); | |
6735 | static ssize_t tracing_buffers_splice_read(struct file *file, loff_t *ppos, | |
6736 | struct pipe_inode_info *pipe, size_t len, unsigned int flags); | |
6737 | ||
6738 | static int snapshot_raw_open(struct inode *inode, struct file *filp) | |
6739 | { | |
6740 | struct ftrace_buffer_info *info; | |
6741 | int ret; | |
6742 | ||
6743 | ret = tracing_buffers_open(inode, filp); | |
6744 | if (ret < 0) | |
6745 | return ret; | |
6746 | ||
6747 | info = filp->private_data; | |
6748 | ||
6749 | if (info->iter.trace->use_max_tr) { | |
6750 | tracing_buffers_release(inode, filp); | |
6751 | return -EBUSY; | |
6752 | } | |
6753 | ||
6754 | info->iter.snapshot = true; | |
6755 | info->iter.trace_buffer = &info->iter.tr->max_buffer; | |
6756 | ||
6757 | return ret; | |
6758 | } | |
6759 | ||
debdd57f HT |
6760 | #endif /* CONFIG_TRACER_SNAPSHOT */ |
6761 | ||
6762 | ||
6508fa76 SF |
6763 | static const struct file_operations tracing_thresh_fops = { |
6764 | .open = tracing_open_generic, | |
6765 | .read = tracing_thresh_read, | |
6766 | .write = tracing_thresh_write, | |
6767 | .llseek = generic_file_llseek, | |
6768 | }; | |
6769 | ||
f971cc9a | 6770 | #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) |
5e2336a0 | 6771 | static const struct file_operations tracing_max_lat_fops = { |
4bf39a94 IM |
6772 | .open = tracing_open_generic, |
6773 | .read = tracing_max_lat_read, | |
6774 | .write = tracing_max_lat_write, | |
b444786f | 6775 | .llseek = generic_file_llseek, |
bc0c38d1 | 6776 | }; |
e428abbb | 6777 | #endif |
bc0c38d1 | 6778 | |
5e2336a0 | 6779 | static const struct file_operations set_tracer_fops = { |
4bf39a94 IM |
6780 | .open = tracing_open_generic, |
6781 | .read = tracing_set_trace_read, | |
6782 | .write = tracing_set_trace_write, | |
b444786f | 6783 | .llseek = generic_file_llseek, |
bc0c38d1 SR |
6784 | }; |
6785 | ||
5e2336a0 | 6786 | static const struct file_operations tracing_pipe_fops = { |
4bf39a94 | 6787 | .open = tracing_open_pipe, |
2a2cc8f7 | 6788 | .poll = tracing_poll_pipe, |
4bf39a94 | 6789 | .read = tracing_read_pipe, |
3c56819b | 6790 | .splice_read = tracing_splice_read_pipe, |
4bf39a94 | 6791 | .release = tracing_release_pipe, |
b444786f | 6792 | .llseek = no_llseek, |
b3806b43 SR |
6793 | }; |
6794 | ||
5e2336a0 | 6795 | static const struct file_operations tracing_entries_fops = { |
0bc392ee | 6796 | .open = tracing_open_generic_tr, |
a98a3c3f SR |
6797 | .read = tracing_entries_read, |
6798 | .write = tracing_entries_write, | |
b444786f | 6799 | .llseek = generic_file_llseek, |
0bc392ee | 6800 | .release = tracing_release_generic_tr, |
a98a3c3f SR |
6801 | }; |
6802 | ||
f81ab074 | 6803 | static const struct file_operations tracing_total_entries_fops = { |
7b85af63 | 6804 | .open = tracing_open_generic_tr, |
f81ab074 VN |
6805 | .read = tracing_total_entries_read, |
6806 | .llseek = generic_file_llseek, | |
7b85af63 | 6807 | .release = tracing_release_generic_tr, |
f81ab074 VN |
6808 | }; |
6809 | ||
4f271a2a | 6810 | static const struct file_operations tracing_free_buffer_fops = { |
7b85af63 | 6811 | .open = tracing_open_generic_tr, |
4f271a2a VN |
6812 | .write = tracing_free_buffer_write, |
6813 | .release = tracing_free_buffer_release, | |
6814 | }; | |
6815 | ||
5e2336a0 | 6816 | static const struct file_operations tracing_mark_fops = { |
7b85af63 | 6817 | .open = tracing_open_generic_tr, |
5bf9a1ee | 6818 | .write = tracing_mark_write, |
b444786f | 6819 | .llseek = generic_file_llseek, |
7b85af63 | 6820 | .release = tracing_release_generic_tr, |
5bf9a1ee PP |
6821 | }; |
6822 | ||
fa32e855 SR |
6823 | static const struct file_operations tracing_mark_raw_fops = { |
6824 | .open = tracing_open_generic_tr, | |
6825 | .write = tracing_mark_raw_write, | |
6826 | .llseek = generic_file_llseek, | |
6827 | .release = tracing_release_generic_tr, | |
6828 | }; | |
6829 | ||
5079f326 | 6830 | static const struct file_operations trace_clock_fops = { |
13f16d20 LZ |
6831 | .open = tracing_clock_open, |
6832 | .read = seq_read, | |
6833 | .llseek = seq_lseek, | |
7b85af63 | 6834 | .release = tracing_single_release_tr, |
5079f326 Z |
6835 | .write = tracing_clock_write, |
6836 | }; | |
6837 | ||
2c1ea60b TZ |
6838 | static const struct file_operations trace_time_stamp_mode_fops = { |
6839 | .open = tracing_time_stamp_mode_open, | |
6840 | .read = seq_read, | |
6841 | .llseek = seq_lseek, | |
6842 | .release = tracing_single_release_tr, | |
6843 | }; | |
6844 | ||
debdd57f HT |
6845 | #ifdef CONFIG_TRACER_SNAPSHOT |
6846 | static const struct file_operations snapshot_fops = { | |
6847 | .open = tracing_snapshot_open, | |
6848 | .read = seq_read, | |
6849 | .write = tracing_snapshot_write, | |
098c879e | 6850 | .llseek = tracing_lseek, |
2b6080f2 | 6851 | .release = tracing_snapshot_release, |
debdd57f | 6852 | }; |
debdd57f | 6853 | |
6de58e62 SRRH |
6854 | static const struct file_operations snapshot_raw_fops = { |
6855 | .open = snapshot_raw_open, | |
6856 | .read = tracing_buffers_read, | |
6857 | .release = tracing_buffers_release, | |
6858 | .splice_read = tracing_buffers_splice_read, | |
6859 | .llseek = no_llseek, | |
2cadf913 SR |
6860 | }; |
6861 | ||
6de58e62 SRRH |
6862 | #endif /* CONFIG_TRACER_SNAPSHOT */ |
6863 | ||
2cadf913 SR |
6864 | static int tracing_buffers_open(struct inode *inode, struct file *filp) |
6865 | { | |
46ef2be0 | 6866 | struct trace_array *tr = inode->i_private; |
2cadf913 | 6867 | struct ftrace_buffer_info *info; |
7b85af63 | 6868 | int ret; |
2cadf913 SR |
6869 | |
6870 | if (tracing_disabled) | |
6871 | return -ENODEV; | |
6872 | ||
7b85af63 SRRH |
6873 | if (trace_array_get(tr) < 0) |
6874 | return -ENODEV; | |
6875 | ||
2cadf913 | 6876 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
7b85af63 SRRH |
6877 | if (!info) { |
6878 | trace_array_put(tr); | |
2cadf913 | 6879 | return -ENOMEM; |
7b85af63 | 6880 | } |
2cadf913 | 6881 | |
a695cb58 SRRH |
6882 | mutex_lock(&trace_types_lock); |
6883 | ||
cc60cdc9 | 6884 | info->iter.tr = tr; |
46ef2be0 | 6885 | info->iter.cpu_file = tracing_get_cpu(inode); |
b627344f | 6886 | info->iter.trace = tr->current_trace; |
12883efb | 6887 | info->iter.trace_buffer = &tr->trace_buffer; |
cc60cdc9 | 6888 | info->spare = NULL; |
2cadf913 | 6889 | /* Force reading ring buffer for first read */ |
cc60cdc9 | 6890 | info->read = (unsigned int)-1; |
2cadf913 SR |
6891 | |
6892 | filp->private_data = info; | |
6893 | ||
cf6ab6d9 SRRH |
6894 | tr->current_trace->ref++; |
6895 | ||
a695cb58 SRRH |
6896 | mutex_unlock(&trace_types_lock); |
6897 | ||
7b85af63 SRRH |
6898 | ret = nonseekable_open(inode, filp); |
6899 | if (ret < 0) | |
6900 | trace_array_put(tr); | |
6901 | ||
6902 | return ret; | |
2cadf913 SR |
6903 | } |
6904 | ||
9dd95748 | 6905 | static __poll_t |
cc60cdc9 SR |
6906 | tracing_buffers_poll(struct file *filp, poll_table *poll_table) |
6907 | { | |
6908 | struct ftrace_buffer_info *info = filp->private_data; | |
6909 | struct trace_iterator *iter = &info->iter; | |
6910 | ||
6911 | return trace_poll(iter, filp, poll_table); | |
6912 | } | |
6913 | ||
2cadf913 SR |
6914 | static ssize_t |
6915 | tracing_buffers_read(struct file *filp, char __user *ubuf, | |
6916 | size_t count, loff_t *ppos) | |
6917 | { | |
6918 | struct ftrace_buffer_info *info = filp->private_data; | |
cc60cdc9 | 6919 | struct trace_iterator *iter = &info->iter; |
a7e52ad7 | 6920 | ssize_t ret = 0; |
6de58e62 | 6921 | ssize_t size; |
2cadf913 | 6922 | |
2dc5d12b SR |
6923 | if (!count) |
6924 | return 0; | |
6925 | ||
6de58e62 | 6926 | #ifdef CONFIG_TRACER_MAX_TRACE |
d716ff71 SRRH |
6927 | if (iter->snapshot && iter->tr->current_trace->use_max_tr) |
6928 | return -EBUSY; | |
6de58e62 SRRH |
6929 | #endif |
6930 | ||
73a757e6 | 6931 | if (!info->spare) { |
12883efb SRRH |
6932 | info->spare = ring_buffer_alloc_read_page(iter->trace_buffer->buffer, |
6933 | iter->cpu_file); | |
a7e52ad7 SRV |
6934 | if (IS_ERR(info->spare)) { |
6935 | ret = PTR_ERR(info->spare); | |
6936 | info->spare = NULL; | |
6937 | } else { | |
6938 | info->spare_cpu = iter->cpu_file; | |
6939 | } | |
73a757e6 | 6940 | } |
ddd538f3 | 6941 | if (!info->spare) |
a7e52ad7 | 6942 | return ret; |
ddd538f3 | 6943 | |
2cadf913 SR |
6944 | /* Do we have previous read data to read? */ |
6945 | if (info->read < PAGE_SIZE) | |
6946 | goto read; | |
6947 | ||
b627344f | 6948 | again: |
cc60cdc9 | 6949 | trace_access_lock(iter->cpu_file); |
12883efb | 6950 | ret = ring_buffer_read_page(iter->trace_buffer->buffer, |
2cadf913 SR |
6951 | &info->spare, |
6952 | count, | |
cc60cdc9 SR |
6953 | iter->cpu_file, 0); |
6954 | trace_access_unlock(iter->cpu_file); | |
2cadf913 | 6955 | |
b627344f SR |
6956 | if (ret < 0) { |
6957 | if (trace_empty(iter)) { | |
d716ff71 SRRH |
6958 | if ((filp->f_flags & O_NONBLOCK)) |
6959 | return -EAGAIN; | |
6960 | ||
2c2b0a78 | 6961 | ret = wait_on_pipe(iter, 0); |
d716ff71 SRRH |
6962 | if (ret) |
6963 | return ret; | |
6964 | ||
b627344f SR |
6965 | goto again; |
6966 | } | |
d716ff71 | 6967 | return 0; |
b627344f | 6968 | } |
436fc280 | 6969 | |
436fc280 | 6970 | info->read = 0; |
b627344f | 6971 | read: |
2cadf913 SR |
6972 | size = PAGE_SIZE - info->read; |
6973 | if (size > count) | |
6974 | size = count; | |
6975 | ||
6976 | ret = copy_to_user(ubuf, info->spare + info->read, size); | |
d716ff71 SRRH |
6977 | if (ret == size) |
6978 | return -EFAULT; | |
6979 | ||
2dc5d12b SR |
6980 | size -= ret; |
6981 | ||
2cadf913 SR |
6982 | *ppos += size; |
6983 | info->read += size; | |
6984 | ||
6985 | return size; | |
6986 | } | |
6987 | ||
6988 | static int tracing_buffers_release(struct inode *inode, struct file *file) | |
6989 | { | |
6990 | struct ftrace_buffer_info *info = file->private_data; | |
cc60cdc9 | 6991 | struct trace_iterator *iter = &info->iter; |
2cadf913 | 6992 | |
a695cb58 SRRH |
6993 | mutex_lock(&trace_types_lock); |
6994 | ||
cf6ab6d9 SRRH |
6995 | iter->tr->current_trace->ref--; |
6996 | ||
ff451961 | 6997 | __trace_array_put(iter->tr); |
2cadf913 | 6998 | |
ddd538f3 | 6999 | if (info->spare) |
73a757e6 SRV |
7000 | ring_buffer_free_read_page(iter->trace_buffer->buffer, |
7001 | info->spare_cpu, info->spare); | |
2cadf913 SR |
7002 | kfree(info); |
7003 | ||
a695cb58 SRRH |
7004 | mutex_unlock(&trace_types_lock); |
7005 | ||
2cadf913 SR |
7006 | return 0; |
7007 | } | |
7008 | ||
7009 | struct buffer_ref { | |
7010 | struct ring_buffer *buffer; | |
7011 | void *page; | |
73a757e6 | 7012 | int cpu; |
2cadf913 SR |
7013 | int ref; |
7014 | }; | |
7015 | ||
7016 | static void buffer_pipe_buf_release(struct pipe_inode_info *pipe, | |
7017 | struct pipe_buffer *buf) | |
7018 | { | |
7019 | struct buffer_ref *ref = (struct buffer_ref *)buf->private; | |
7020 | ||
7021 | if (--ref->ref) | |
7022 | return; | |
7023 | ||
73a757e6 | 7024 | ring_buffer_free_read_page(ref->buffer, ref->cpu, ref->page); |
2cadf913 SR |
7025 | kfree(ref); |
7026 | buf->private = 0; | |
7027 | } | |
7028 | ||
2cadf913 SR |
7029 | static void buffer_pipe_buf_get(struct pipe_inode_info *pipe, |
7030 | struct pipe_buffer *buf) | |
7031 | { | |
7032 | struct buffer_ref *ref = (struct buffer_ref *)buf->private; | |
7033 | ||
7034 | ref->ref++; | |
7035 | } | |
7036 | ||
7037 | /* Pipe buffer operations for a buffer. */ | |
28dfef8f | 7038 | static const struct pipe_buf_operations buffer_pipe_buf_ops = { |
2cadf913 | 7039 | .can_merge = 0, |
2cadf913 SR |
7040 | .confirm = generic_pipe_buf_confirm, |
7041 | .release = buffer_pipe_buf_release, | |
d55cb6cf | 7042 | .steal = generic_pipe_buf_steal, |
2cadf913 SR |
7043 | .get = buffer_pipe_buf_get, |
7044 | }; | |
7045 | ||
7046 | /* | |
7047 | * Callback from splice_to_pipe(), if we need to release some pages | |
7048 | * at the end of the spd in case we error'ed out in filling the pipe. | |
7049 | */ | |
7050 | static void buffer_spd_release(struct splice_pipe_desc *spd, unsigned int i) | |
7051 | { | |
7052 | struct buffer_ref *ref = | |
7053 | (struct buffer_ref *)spd->partial[i].private; | |
7054 | ||
7055 | if (--ref->ref) | |
7056 | return; | |
7057 | ||
73a757e6 | 7058 | ring_buffer_free_read_page(ref->buffer, ref->cpu, ref->page); |
2cadf913 SR |
7059 | kfree(ref); |
7060 | spd->partial[i].private = 0; | |
7061 | } | |
7062 | ||
7063 | static ssize_t | |
7064 | tracing_buffers_splice_read(struct file *file, loff_t *ppos, | |
7065 | struct pipe_inode_info *pipe, size_t len, | |
7066 | unsigned int flags) | |
7067 | { | |
7068 | struct ftrace_buffer_info *info = file->private_data; | |
cc60cdc9 | 7069 | struct trace_iterator *iter = &info->iter; |
35f3d14d JA |
7070 | struct partial_page partial_def[PIPE_DEF_BUFFERS]; |
7071 | struct page *pages_def[PIPE_DEF_BUFFERS]; | |
2cadf913 | 7072 | struct splice_pipe_desc spd = { |
35f3d14d JA |
7073 | .pages = pages_def, |
7074 | .partial = partial_def, | |
047fe360 | 7075 | .nr_pages_max = PIPE_DEF_BUFFERS, |
2cadf913 SR |
7076 | .ops = &buffer_pipe_buf_ops, |
7077 | .spd_release = buffer_spd_release, | |
7078 | }; | |
7079 | struct buffer_ref *ref; | |
6b7e633f | 7080 | int entries, i; |
07906da7 | 7081 | ssize_t ret = 0; |
2cadf913 | 7082 | |
6de58e62 | 7083 | #ifdef CONFIG_TRACER_MAX_TRACE |
d716ff71 SRRH |
7084 | if (iter->snapshot && iter->tr->current_trace->use_max_tr) |
7085 | return -EBUSY; | |
6de58e62 SRRH |
7086 | #endif |
7087 | ||
d716ff71 SRRH |
7088 | if (*ppos & (PAGE_SIZE - 1)) |
7089 | return -EINVAL; | |
93cfb3c9 LJ |
7090 | |
7091 | if (len & (PAGE_SIZE - 1)) { | |
d716ff71 SRRH |
7092 | if (len < PAGE_SIZE) |
7093 | return -EINVAL; | |
93cfb3c9 LJ |
7094 | len &= PAGE_MASK; |
7095 | } | |
7096 | ||
1ae2293d AV |
7097 | if (splice_grow_spd(pipe, &spd)) |
7098 | return -ENOMEM; | |
7099 | ||
cc60cdc9 SR |
7100 | again: |
7101 | trace_access_lock(iter->cpu_file); | |
12883efb | 7102 | entries = ring_buffer_entries_cpu(iter->trace_buffer->buffer, iter->cpu_file); |
93459c6c | 7103 | |
a786c06d | 7104 | for (i = 0; i < spd.nr_pages_max && len && entries; i++, len -= PAGE_SIZE) { |
2cadf913 SR |
7105 | struct page *page; |
7106 | int r; | |
7107 | ||
7108 | ref = kzalloc(sizeof(*ref), GFP_KERNEL); | |
07906da7 RV |
7109 | if (!ref) { |
7110 | ret = -ENOMEM; | |
2cadf913 | 7111 | break; |
07906da7 | 7112 | } |
2cadf913 | 7113 | |
7267fa68 | 7114 | ref->ref = 1; |
12883efb | 7115 | ref->buffer = iter->trace_buffer->buffer; |
cc60cdc9 | 7116 | ref->page = ring_buffer_alloc_read_page(ref->buffer, iter->cpu_file); |
a7e52ad7 SRV |
7117 | if (IS_ERR(ref->page)) { |
7118 | ret = PTR_ERR(ref->page); | |
7119 | ref->page = NULL; | |
2cadf913 SR |
7120 | kfree(ref); |
7121 | break; | |
7122 | } | |
73a757e6 | 7123 | ref->cpu = iter->cpu_file; |
2cadf913 SR |
7124 | |
7125 | r = ring_buffer_read_page(ref->buffer, &ref->page, | |
cc60cdc9 | 7126 | len, iter->cpu_file, 1); |
2cadf913 | 7127 | if (r < 0) { |
73a757e6 SRV |
7128 | ring_buffer_free_read_page(ref->buffer, ref->cpu, |
7129 | ref->page); | |
2cadf913 SR |
7130 | kfree(ref); |
7131 | break; | |
7132 | } | |
7133 | ||
2cadf913 SR |
7134 | page = virt_to_page(ref->page); |
7135 | ||
7136 | spd.pages[i] = page; | |
7137 | spd.partial[i].len = PAGE_SIZE; | |
7138 | spd.partial[i].offset = 0; | |
7139 | spd.partial[i].private = (unsigned long)ref; | |
7140 | spd.nr_pages++; | |
93cfb3c9 | 7141 | *ppos += PAGE_SIZE; |
93459c6c | 7142 | |
12883efb | 7143 | entries = ring_buffer_entries_cpu(iter->trace_buffer->buffer, iter->cpu_file); |
2cadf913 SR |
7144 | } |
7145 | ||
cc60cdc9 | 7146 | trace_access_unlock(iter->cpu_file); |
2cadf913 SR |
7147 | spd.nr_pages = i; |
7148 | ||
7149 | /* did we read anything? */ | |
7150 | if (!spd.nr_pages) { | |
07906da7 | 7151 | if (ret) |
1ae2293d | 7152 | goto out; |
d716ff71 | 7153 | |
1ae2293d | 7154 | ret = -EAGAIN; |
d716ff71 | 7155 | if ((file->f_flags & O_NONBLOCK) || (flags & SPLICE_F_NONBLOCK)) |
1ae2293d | 7156 | goto out; |
07906da7 | 7157 | |
03329f99 | 7158 | ret = wait_on_pipe(iter, iter->tr->buffer_percent); |
8b8b3683 | 7159 | if (ret) |
1ae2293d | 7160 | goto out; |
e30f53aa | 7161 | |
cc60cdc9 | 7162 | goto again; |
2cadf913 SR |
7163 | } |
7164 | ||
7165 | ret = splice_to_pipe(pipe, &spd); | |
1ae2293d | 7166 | out: |
047fe360 | 7167 | splice_shrink_spd(&spd); |
6de58e62 | 7168 | |
2cadf913 SR |
7169 | return ret; |
7170 | } | |
7171 | ||
7172 | static const struct file_operations tracing_buffers_fops = { | |
7173 | .open = tracing_buffers_open, | |
7174 | .read = tracing_buffers_read, | |
cc60cdc9 | 7175 | .poll = tracing_buffers_poll, |
2cadf913 SR |
7176 | .release = tracing_buffers_release, |
7177 | .splice_read = tracing_buffers_splice_read, | |
7178 | .llseek = no_llseek, | |
7179 | }; | |
7180 | ||
c8d77183 SR |
7181 | static ssize_t |
7182 | tracing_stats_read(struct file *filp, char __user *ubuf, | |
7183 | size_t count, loff_t *ppos) | |
7184 | { | |
4d3435b8 ON |
7185 | struct inode *inode = file_inode(filp); |
7186 | struct trace_array *tr = inode->i_private; | |
12883efb | 7187 | struct trace_buffer *trace_buf = &tr->trace_buffer; |
4d3435b8 | 7188 | int cpu = tracing_get_cpu(inode); |
c8d77183 SR |
7189 | struct trace_seq *s; |
7190 | unsigned long cnt; | |
c64e148a VN |
7191 | unsigned long long t; |
7192 | unsigned long usec_rem; | |
c8d77183 | 7193 | |
e4f2d10f | 7194 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
c8d77183 | 7195 | if (!s) |
a646365c | 7196 | return -ENOMEM; |
c8d77183 SR |
7197 | |
7198 | trace_seq_init(s); | |
7199 | ||
12883efb | 7200 | cnt = ring_buffer_entries_cpu(trace_buf->buffer, cpu); |
c8d77183 SR |
7201 | trace_seq_printf(s, "entries: %ld\n", cnt); |
7202 | ||
12883efb | 7203 | cnt = ring_buffer_overrun_cpu(trace_buf->buffer, cpu); |
c8d77183 SR |
7204 | trace_seq_printf(s, "overrun: %ld\n", cnt); |
7205 | ||
12883efb | 7206 | cnt = ring_buffer_commit_overrun_cpu(trace_buf->buffer, cpu); |
c8d77183 SR |
7207 | trace_seq_printf(s, "commit overrun: %ld\n", cnt); |
7208 | ||
12883efb | 7209 | cnt = ring_buffer_bytes_cpu(trace_buf->buffer, cpu); |
c64e148a VN |
7210 | trace_seq_printf(s, "bytes: %ld\n", cnt); |
7211 | ||
58e8eedf | 7212 | if (trace_clocks[tr->clock_id].in_ns) { |
11043d8b | 7213 | /* local or global for trace_clock */ |
12883efb | 7214 | t = ns2usecs(ring_buffer_oldest_event_ts(trace_buf->buffer, cpu)); |
11043d8b YY |
7215 | usec_rem = do_div(t, USEC_PER_SEC); |
7216 | trace_seq_printf(s, "oldest event ts: %5llu.%06lu\n", | |
7217 | t, usec_rem); | |
7218 | ||
12883efb | 7219 | t = ns2usecs(ring_buffer_time_stamp(trace_buf->buffer, cpu)); |
11043d8b YY |
7220 | usec_rem = do_div(t, USEC_PER_SEC); |
7221 | trace_seq_printf(s, "now ts: %5llu.%06lu\n", t, usec_rem); | |
7222 | } else { | |
7223 | /* counter or tsc mode for trace_clock */ | |
7224 | trace_seq_printf(s, "oldest event ts: %llu\n", | |
12883efb | 7225 | ring_buffer_oldest_event_ts(trace_buf->buffer, cpu)); |
c64e148a | 7226 | |
11043d8b | 7227 | trace_seq_printf(s, "now ts: %llu\n", |
12883efb | 7228 | ring_buffer_time_stamp(trace_buf->buffer, cpu)); |
11043d8b | 7229 | } |
c64e148a | 7230 | |
12883efb | 7231 | cnt = ring_buffer_dropped_events_cpu(trace_buf->buffer, cpu); |
884bfe89 SP |
7232 | trace_seq_printf(s, "dropped events: %ld\n", cnt); |
7233 | ||
12883efb | 7234 | cnt = ring_buffer_read_events_cpu(trace_buf->buffer, cpu); |
ad964704 SRRH |
7235 | trace_seq_printf(s, "read events: %ld\n", cnt); |
7236 | ||
5ac48378 SRRH |
7237 | count = simple_read_from_buffer(ubuf, count, ppos, |
7238 | s->buffer, trace_seq_used(s)); | |
c8d77183 SR |
7239 | |
7240 | kfree(s); | |
7241 | ||
7242 | return count; | |
7243 | } | |
7244 | ||
7245 | static const struct file_operations tracing_stats_fops = { | |
4d3435b8 | 7246 | .open = tracing_open_generic_tr, |
c8d77183 | 7247 | .read = tracing_stats_read, |
b444786f | 7248 | .llseek = generic_file_llseek, |
4d3435b8 | 7249 | .release = tracing_release_generic_tr, |
c8d77183 SR |
7250 | }; |
7251 | ||
bc0c38d1 SR |
7252 | #ifdef CONFIG_DYNAMIC_FTRACE |
7253 | ||
7254 | static ssize_t | |
b807c3d0 | 7255 | tracing_read_dyn_info(struct file *filp, char __user *ubuf, |
bc0c38d1 SR |
7256 | size_t cnt, loff_t *ppos) |
7257 | { | |
7258 | unsigned long *p = filp->private_data; | |
6a9c981b | 7259 | char buf[64]; /* Not too big for a shallow stack */ |
bc0c38d1 SR |
7260 | int r; |
7261 | ||
6a9c981b | 7262 | r = scnprintf(buf, 63, "%ld", *p); |
b807c3d0 SR |
7263 | buf[r++] = '\n'; |
7264 | ||
6a9c981b | 7265 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
7266 | } |
7267 | ||
5e2336a0 | 7268 | static const struct file_operations tracing_dyn_info_fops = { |
4bf39a94 | 7269 | .open = tracing_open_generic, |
b807c3d0 | 7270 | .read = tracing_read_dyn_info, |
b444786f | 7271 | .llseek = generic_file_llseek, |
bc0c38d1 | 7272 | }; |
77fd5c15 | 7273 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
bc0c38d1 | 7274 | |
77fd5c15 SRRH |
7275 | #if defined(CONFIG_TRACER_SNAPSHOT) && defined(CONFIG_DYNAMIC_FTRACE) |
7276 | static void | |
bca6c8d0 | 7277 | ftrace_snapshot(unsigned long ip, unsigned long parent_ip, |
b5f081b5 | 7278 | struct trace_array *tr, struct ftrace_probe_ops *ops, |
6e444319 | 7279 | void *data) |
77fd5c15 | 7280 | { |
cab50379 | 7281 | tracing_snapshot_instance(tr); |
77fd5c15 | 7282 | } |
bc0c38d1 | 7283 | |
77fd5c15 | 7284 | static void |
bca6c8d0 | 7285 | ftrace_count_snapshot(unsigned long ip, unsigned long parent_ip, |
b5f081b5 | 7286 | struct trace_array *tr, struct ftrace_probe_ops *ops, |
6e444319 | 7287 | void *data) |
bc0c38d1 | 7288 | { |
6e444319 | 7289 | struct ftrace_func_mapper *mapper = data; |
1a93f8bd | 7290 | long *count = NULL; |
77fd5c15 | 7291 | |
1a93f8bd SRV |
7292 | if (mapper) |
7293 | count = (long *)ftrace_func_mapper_find_ip(mapper, ip); | |
7294 | ||
7295 | if (count) { | |
7296 | ||
7297 | if (*count <= 0) | |
7298 | return; | |
bc0c38d1 | 7299 | |
77fd5c15 | 7300 | (*count)--; |
1a93f8bd | 7301 | } |
77fd5c15 | 7302 | |
cab50379 | 7303 | tracing_snapshot_instance(tr); |
77fd5c15 SRRH |
7304 | } |
7305 | ||
7306 | static int | |
7307 | ftrace_snapshot_print(struct seq_file *m, unsigned long ip, | |
7308 | struct ftrace_probe_ops *ops, void *data) | |
7309 | { | |
6e444319 | 7310 | struct ftrace_func_mapper *mapper = data; |
1a93f8bd | 7311 | long *count = NULL; |
77fd5c15 SRRH |
7312 | |
7313 | seq_printf(m, "%ps:", (void *)ip); | |
7314 | ||
fa6f0cc7 | 7315 | seq_puts(m, "snapshot"); |
77fd5c15 | 7316 | |
1a93f8bd SRV |
7317 | if (mapper) |
7318 | count = (long *)ftrace_func_mapper_find_ip(mapper, ip); | |
7319 | ||
7320 | if (count) | |
7321 | seq_printf(m, ":count=%ld\n", *count); | |
77fd5c15 | 7322 | else |
1a93f8bd | 7323 | seq_puts(m, ":unlimited\n"); |
77fd5c15 SRRH |
7324 | |
7325 | return 0; | |
7326 | } | |
7327 | ||
1a93f8bd | 7328 | static int |
b5f081b5 | 7329 | ftrace_snapshot_init(struct ftrace_probe_ops *ops, struct trace_array *tr, |
6e444319 | 7330 | unsigned long ip, void *init_data, void **data) |
1a93f8bd | 7331 | { |
6e444319 SRV |
7332 | struct ftrace_func_mapper *mapper = *data; |
7333 | ||
7334 | if (!mapper) { | |
7335 | mapper = allocate_ftrace_func_mapper(); | |
7336 | if (!mapper) | |
7337 | return -ENOMEM; | |
7338 | *data = mapper; | |
7339 | } | |
1a93f8bd | 7340 | |
6e444319 | 7341 | return ftrace_func_mapper_add_ip(mapper, ip, init_data); |
1a93f8bd SRV |
7342 | } |
7343 | ||
7344 | static void | |
b5f081b5 | 7345 | ftrace_snapshot_free(struct ftrace_probe_ops *ops, struct trace_array *tr, |
6e444319 | 7346 | unsigned long ip, void *data) |
1a93f8bd | 7347 | { |
6e444319 SRV |
7348 | struct ftrace_func_mapper *mapper = data; |
7349 | ||
7350 | if (!ip) { | |
7351 | if (!mapper) | |
7352 | return; | |
7353 | free_ftrace_func_mapper(mapper, NULL); | |
7354 | return; | |
7355 | } | |
1a93f8bd SRV |
7356 | |
7357 | ftrace_func_mapper_remove_ip(mapper, ip); | |
7358 | } | |
7359 | ||
77fd5c15 SRRH |
7360 | static struct ftrace_probe_ops snapshot_probe_ops = { |
7361 | .func = ftrace_snapshot, | |
7362 | .print = ftrace_snapshot_print, | |
7363 | }; | |
7364 | ||
7365 | static struct ftrace_probe_ops snapshot_count_probe_ops = { | |
7366 | .func = ftrace_count_snapshot, | |
7367 | .print = ftrace_snapshot_print, | |
1a93f8bd SRV |
7368 | .init = ftrace_snapshot_init, |
7369 | .free = ftrace_snapshot_free, | |
77fd5c15 SRRH |
7370 | }; |
7371 | ||
7372 | static int | |
04ec7bb6 | 7373 | ftrace_trace_snapshot_callback(struct trace_array *tr, struct ftrace_hash *hash, |
77fd5c15 SRRH |
7374 | char *glob, char *cmd, char *param, int enable) |
7375 | { | |
7376 | struct ftrace_probe_ops *ops; | |
7377 | void *count = (void *)-1; | |
7378 | char *number; | |
7379 | int ret; | |
7380 | ||
0f179765 SRV |
7381 | if (!tr) |
7382 | return -ENODEV; | |
7383 | ||
77fd5c15 SRRH |
7384 | /* hash funcs only work with set_ftrace_filter */ |
7385 | if (!enable) | |
7386 | return -EINVAL; | |
7387 | ||
7388 | ops = param ? &snapshot_count_probe_ops : &snapshot_probe_ops; | |
7389 | ||
d3d532d7 | 7390 | if (glob[0] == '!') |
7b60f3d8 | 7391 | return unregister_ftrace_function_probe_func(glob+1, tr, ops); |
77fd5c15 SRRH |
7392 | |
7393 | if (!param) | |
7394 | goto out_reg; | |
7395 | ||
7396 | number = strsep(¶m, ":"); | |
7397 | ||
7398 | if (!strlen(number)) | |
7399 | goto out_reg; | |
7400 | ||
7401 | /* | |
7402 | * We use the callback data field (which is a pointer) | |
7403 | * as our counter. | |
7404 | */ | |
7405 | ret = kstrtoul(number, 0, (unsigned long *)&count); | |
7406 | if (ret) | |
7407 | return ret; | |
7408 | ||
7409 | out_reg: | |
2824f503 | 7410 | ret = tracing_alloc_snapshot_instance(tr); |
df62db5b SRV |
7411 | if (ret < 0) |
7412 | goto out; | |
77fd5c15 | 7413 | |
4c174688 | 7414 | ret = register_ftrace_function_probe(glob, tr, ops, count); |
77fd5c15 | 7415 | |
df62db5b | 7416 | out: |
77fd5c15 SRRH |
7417 | return ret < 0 ? ret : 0; |
7418 | } | |
7419 | ||
7420 | static struct ftrace_func_command ftrace_snapshot_cmd = { | |
7421 | .name = "snapshot", | |
7422 | .func = ftrace_trace_snapshot_callback, | |
7423 | }; | |
7424 | ||
38de93ab | 7425 | static __init int register_snapshot_cmd(void) |
77fd5c15 SRRH |
7426 | { |
7427 | return register_ftrace_command(&ftrace_snapshot_cmd); | |
7428 | } | |
7429 | #else | |
38de93ab | 7430 | static inline __init int register_snapshot_cmd(void) { return 0; } |
77fd5c15 | 7431 | #endif /* defined(CONFIG_TRACER_SNAPSHOT) && defined(CONFIG_DYNAMIC_FTRACE) */ |
bc0c38d1 | 7432 | |
7eeafbca | 7433 | static struct dentry *tracing_get_dentry(struct trace_array *tr) |
bc0c38d1 | 7434 | { |
8434dc93 SRRH |
7435 | if (WARN_ON(!tr->dir)) |
7436 | return ERR_PTR(-ENODEV); | |
7437 | ||
7438 | /* Top directory uses NULL as the parent */ | |
7439 | if (tr->flags & TRACE_ARRAY_FL_GLOBAL) | |
7440 | return NULL; | |
7441 | ||
7442 | /* All sub buffers have a descriptor */ | |
2b6080f2 | 7443 | return tr->dir; |
bc0c38d1 SR |
7444 | } |
7445 | ||
2b6080f2 | 7446 | static struct dentry *tracing_dentry_percpu(struct trace_array *tr, int cpu) |
b04cc6b1 | 7447 | { |
b04cc6b1 FW |
7448 | struct dentry *d_tracer; |
7449 | ||
2b6080f2 SR |
7450 | if (tr->percpu_dir) |
7451 | return tr->percpu_dir; | |
b04cc6b1 | 7452 | |
7eeafbca | 7453 | d_tracer = tracing_get_dentry(tr); |
14a5ae40 | 7454 | if (IS_ERR(d_tracer)) |
b04cc6b1 FW |
7455 | return NULL; |
7456 | ||
8434dc93 | 7457 | tr->percpu_dir = tracefs_create_dir("per_cpu", d_tracer); |
b04cc6b1 | 7458 | |
2b6080f2 | 7459 | WARN_ONCE(!tr->percpu_dir, |
8434dc93 | 7460 | "Could not create tracefs directory 'per_cpu/%d'\n", cpu); |
b04cc6b1 | 7461 | |
2b6080f2 | 7462 | return tr->percpu_dir; |
b04cc6b1 FW |
7463 | } |
7464 | ||
649e9c70 ON |
7465 | static struct dentry * |
7466 | trace_create_cpu_file(const char *name, umode_t mode, struct dentry *parent, | |
7467 | void *data, long cpu, const struct file_operations *fops) | |
7468 | { | |
7469 | struct dentry *ret = trace_create_file(name, mode, parent, data, fops); | |
7470 | ||
7471 | if (ret) /* See tracing_get_cpu() */ | |
7682c918 | 7472 | d_inode(ret)->i_cdev = (void *)(cpu + 1); |
649e9c70 ON |
7473 | return ret; |
7474 | } | |
7475 | ||
2b6080f2 | 7476 | static void |
8434dc93 | 7477 | tracing_init_tracefs_percpu(struct trace_array *tr, long cpu) |
b04cc6b1 | 7478 | { |
2b6080f2 | 7479 | struct dentry *d_percpu = tracing_dentry_percpu(tr, cpu); |
5452af66 | 7480 | struct dentry *d_cpu; |
dd49a38c | 7481 | char cpu_dir[30]; /* 30 characters should be more than enough */ |
b04cc6b1 | 7482 | |
0a3d7ce7 NK |
7483 | if (!d_percpu) |
7484 | return; | |
7485 | ||
dd49a38c | 7486 | snprintf(cpu_dir, 30, "cpu%ld", cpu); |
8434dc93 | 7487 | d_cpu = tracefs_create_dir(cpu_dir, d_percpu); |
8656e7a2 | 7488 | if (!d_cpu) { |
a395d6a7 | 7489 | pr_warn("Could not create tracefs '%s' entry\n", cpu_dir); |
8656e7a2 FW |
7490 | return; |
7491 | } | |
b04cc6b1 | 7492 | |
8656e7a2 | 7493 | /* per cpu trace_pipe */ |
649e9c70 | 7494 | trace_create_cpu_file("trace_pipe", 0444, d_cpu, |
15544209 | 7495 | tr, cpu, &tracing_pipe_fops); |
b04cc6b1 FW |
7496 | |
7497 | /* per cpu trace */ | |
649e9c70 | 7498 | trace_create_cpu_file("trace", 0644, d_cpu, |
6484c71c | 7499 | tr, cpu, &tracing_fops); |
7f96f93f | 7500 | |
649e9c70 | 7501 | trace_create_cpu_file("trace_pipe_raw", 0444, d_cpu, |
46ef2be0 | 7502 | tr, cpu, &tracing_buffers_fops); |
7f96f93f | 7503 | |
649e9c70 | 7504 | trace_create_cpu_file("stats", 0444, d_cpu, |
4d3435b8 | 7505 | tr, cpu, &tracing_stats_fops); |
438ced17 | 7506 | |
649e9c70 | 7507 | trace_create_cpu_file("buffer_size_kb", 0444, d_cpu, |
0bc392ee | 7508 | tr, cpu, &tracing_entries_fops); |
f1affcaa SRRH |
7509 | |
7510 | #ifdef CONFIG_TRACER_SNAPSHOT | |
649e9c70 | 7511 | trace_create_cpu_file("snapshot", 0644, d_cpu, |
6484c71c | 7512 | tr, cpu, &snapshot_fops); |
6de58e62 | 7513 | |
649e9c70 | 7514 | trace_create_cpu_file("snapshot_raw", 0444, d_cpu, |
46ef2be0 | 7515 | tr, cpu, &snapshot_raw_fops); |
f1affcaa | 7516 | #endif |
b04cc6b1 FW |
7517 | } |
7518 | ||
60a11774 SR |
7519 | #ifdef CONFIG_FTRACE_SELFTEST |
7520 | /* Let selftest have access to static functions in this file */ | |
7521 | #include "trace_selftest.c" | |
7522 | #endif | |
7523 | ||
577b785f SR |
7524 | static ssize_t |
7525 | trace_options_read(struct file *filp, char __user *ubuf, size_t cnt, | |
7526 | loff_t *ppos) | |
7527 | { | |
7528 | struct trace_option_dentry *topt = filp->private_data; | |
7529 | char *buf; | |
7530 | ||
7531 | if (topt->flags->val & topt->opt->bit) | |
7532 | buf = "1\n"; | |
7533 | else | |
7534 | buf = "0\n"; | |
7535 | ||
7536 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
7537 | } | |
7538 | ||
7539 | static ssize_t | |
7540 | trace_options_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
7541 | loff_t *ppos) | |
7542 | { | |
7543 | struct trace_option_dentry *topt = filp->private_data; | |
7544 | unsigned long val; | |
577b785f SR |
7545 | int ret; |
7546 | ||
22fe9b54 PH |
7547 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
7548 | if (ret) | |
577b785f SR |
7549 | return ret; |
7550 | ||
8d18eaaf LZ |
7551 | if (val != 0 && val != 1) |
7552 | return -EINVAL; | |
577b785f | 7553 | |
8d18eaaf | 7554 | if (!!(topt->flags->val & topt->opt->bit) != val) { |
577b785f | 7555 | mutex_lock(&trace_types_lock); |
8c1a49ae | 7556 | ret = __set_tracer_option(topt->tr, topt->flags, |
c757bea9 | 7557 | topt->opt, !val); |
577b785f SR |
7558 | mutex_unlock(&trace_types_lock); |
7559 | if (ret) | |
7560 | return ret; | |
577b785f SR |
7561 | } |
7562 | ||
7563 | *ppos += cnt; | |
7564 | ||
7565 | return cnt; | |
7566 | } | |
7567 | ||
7568 | ||
7569 | static const struct file_operations trace_options_fops = { | |
7570 | .open = tracing_open_generic, | |
7571 | .read = trace_options_read, | |
7572 | .write = trace_options_write, | |
b444786f | 7573 | .llseek = generic_file_llseek, |
577b785f SR |
7574 | }; |
7575 | ||
9a38a885 SRRH |
7576 | /* |
7577 | * In order to pass in both the trace_array descriptor as well as the index | |
7578 | * to the flag that the trace option file represents, the trace_array | |
7579 | * has a character array of trace_flags_index[], which holds the index | |
7580 | * of the bit for the flag it represents. index[0] == 0, index[1] == 1, etc. | |
7581 | * The address of this character array is passed to the flag option file | |
7582 | * read/write callbacks. | |
7583 | * | |
7584 | * In order to extract both the index and the trace_array descriptor, | |
7585 | * get_tr_index() uses the following algorithm. | |
7586 | * | |
7587 | * idx = *ptr; | |
7588 | * | |
7589 | * As the pointer itself contains the address of the index (remember | |
7590 | * index[1] == 1). | |
7591 | * | |
7592 | * Then to get the trace_array descriptor, by subtracting that index | |
7593 | * from the ptr, we get to the start of the index itself. | |
7594 | * | |
7595 | * ptr - idx == &index[0] | |
7596 | * | |
7597 | * Then a simple container_of() from that pointer gets us to the | |
7598 | * trace_array descriptor. | |
7599 | */ | |
7600 | static void get_tr_index(void *data, struct trace_array **ptr, | |
7601 | unsigned int *pindex) | |
7602 | { | |
7603 | *pindex = *(unsigned char *)data; | |
7604 | ||
7605 | *ptr = container_of(data - *pindex, struct trace_array, | |
7606 | trace_flags_index); | |
7607 | } | |
7608 | ||
a8259075 SR |
7609 | static ssize_t |
7610 | trace_options_core_read(struct file *filp, char __user *ubuf, size_t cnt, | |
7611 | loff_t *ppos) | |
7612 | { | |
9a38a885 SRRH |
7613 | void *tr_index = filp->private_data; |
7614 | struct trace_array *tr; | |
7615 | unsigned int index; | |
a8259075 SR |
7616 | char *buf; |
7617 | ||
9a38a885 SRRH |
7618 | get_tr_index(tr_index, &tr, &index); |
7619 | ||
7620 | if (tr->trace_flags & (1 << index)) | |
a8259075 SR |
7621 | buf = "1\n"; |
7622 | else | |
7623 | buf = "0\n"; | |
7624 | ||
7625 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
7626 | } | |
7627 | ||
7628 | static ssize_t | |
7629 | trace_options_core_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
7630 | loff_t *ppos) | |
7631 | { | |
9a38a885 SRRH |
7632 | void *tr_index = filp->private_data; |
7633 | struct trace_array *tr; | |
7634 | unsigned int index; | |
a8259075 SR |
7635 | unsigned long val; |
7636 | int ret; | |
7637 | ||
9a38a885 SRRH |
7638 | get_tr_index(tr_index, &tr, &index); |
7639 | ||
22fe9b54 PH |
7640 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
7641 | if (ret) | |
a8259075 SR |
7642 | return ret; |
7643 | ||
f2d84b65 | 7644 | if (val != 0 && val != 1) |
a8259075 | 7645 | return -EINVAL; |
69d34da2 SRRH |
7646 | |
7647 | mutex_lock(&trace_types_lock); | |
2b6080f2 | 7648 | ret = set_tracer_flag(tr, 1 << index, val); |
69d34da2 | 7649 | mutex_unlock(&trace_types_lock); |
a8259075 | 7650 | |
613f04a0 SRRH |
7651 | if (ret < 0) |
7652 | return ret; | |
7653 | ||
a8259075 SR |
7654 | *ppos += cnt; |
7655 | ||
7656 | return cnt; | |
7657 | } | |
7658 | ||
a8259075 SR |
7659 | static const struct file_operations trace_options_core_fops = { |
7660 | .open = tracing_open_generic, | |
7661 | .read = trace_options_core_read, | |
7662 | .write = trace_options_core_write, | |
b444786f | 7663 | .llseek = generic_file_llseek, |
a8259075 SR |
7664 | }; |
7665 | ||
5452af66 | 7666 | struct dentry *trace_create_file(const char *name, |
f4ae40a6 | 7667 | umode_t mode, |
5452af66 FW |
7668 | struct dentry *parent, |
7669 | void *data, | |
7670 | const struct file_operations *fops) | |
7671 | { | |
7672 | struct dentry *ret; | |
7673 | ||
8434dc93 | 7674 | ret = tracefs_create_file(name, mode, parent, data, fops); |
5452af66 | 7675 | if (!ret) |
a395d6a7 | 7676 | pr_warn("Could not create tracefs '%s' entry\n", name); |
5452af66 FW |
7677 | |
7678 | return ret; | |
7679 | } | |
7680 | ||
7681 | ||
2b6080f2 | 7682 | static struct dentry *trace_options_init_dentry(struct trace_array *tr) |
a8259075 SR |
7683 | { |
7684 | struct dentry *d_tracer; | |
a8259075 | 7685 | |
2b6080f2 SR |
7686 | if (tr->options) |
7687 | return tr->options; | |
a8259075 | 7688 | |
7eeafbca | 7689 | d_tracer = tracing_get_dentry(tr); |
14a5ae40 | 7690 | if (IS_ERR(d_tracer)) |
a8259075 SR |
7691 | return NULL; |
7692 | ||
8434dc93 | 7693 | tr->options = tracefs_create_dir("options", d_tracer); |
2b6080f2 | 7694 | if (!tr->options) { |
a395d6a7 | 7695 | pr_warn("Could not create tracefs directory 'options'\n"); |
a8259075 SR |
7696 | return NULL; |
7697 | } | |
7698 | ||
2b6080f2 | 7699 | return tr->options; |
a8259075 SR |
7700 | } |
7701 | ||
577b785f | 7702 | static void |
2b6080f2 SR |
7703 | create_trace_option_file(struct trace_array *tr, |
7704 | struct trace_option_dentry *topt, | |
577b785f SR |
7705 | struct tracer_flags *flags, |
7706 | struct tracer_opt *opt) | |
7707 | { | |
7708 | struct dentry *t_options; | |
577b785f | 7709 | |
2b6080f2 | 7710 | t_options = trace_options_init_dentry(tr); |
577b785f SR |
7711 | if (!t_options) |
7712 | return; | |
7713 | ||
7714 | topt->flags = flags; | |
7715 | topt->opt = opt; | |
2b6080f2 | 7716 | topt->tr = tr; |
577b785f | 7717 | |
5452af66 | 7718 | topt->entry = trace_create_file(opt->name, 0644, t_options, topt, |
577b785f SR |
7719 | &trace_options_fops); |
7720 | ||
577b785f SR |
7721 | } |
7722 | ||
37aea98b | 7723 | static void |
2b6080f2 | 7724 | create_trace_option_files(struct trace_array *tr, struct tracer *tracer) |
577b785f SR |
7725 | { |
7726 | struct trace_option_dentry *topts; | |
37aea98b | 7727 | struct trace_options *tr_topts; |
577b785f SR |
7728 | struct tracer_flags *flags; |
7729 | struct tracer_opt *opts; | |
7730 | int cnt; | |
37aea98b | 7731 | int i; |
577b785f SR |
7732 | |
7733 | if (!tracer) | |
37aea98b | 7734 | return; |
577b785f SR |
7735 | |
7736 | flags = tracer->flags; | |
7737 | ||
7738 | if (!flags || !flags->opts) | |
37aea98b SRRH |
7739 | return; |
7740 | ||
7741 | /* | |
7742 | * If this is an instance, only create flags for tracers | |
7743 | * the instance may have. | |
7744 | */ | |
7745 | if (!trace_ok_for_array(tracer, tr)) | |
7746 | return; | |
7747 | ||
7748 | for (i = 0; i < tr->nr_topts; i++) { | |
d39cdd20 CH |
7749 | /* Make sure there's no duplicate flags. */ |
7750 | if (WARN_ON_ONCE(tr->topts[i].tracer->flags == tracer->flags)) | |
37aea98b SRRH |
7751 | return; |
7752 | } | |
577b785f SR |
7753 | |
7754 | opts = flags->opts; | |
7755 | ||
7756 | for (cnt = 0; opts[cnt].name; cnt++) | |
7757 | ; | |
7758 | ||
0cfe8245 | 7759 | topts = kcalloc(cnt + 1, sizeof(*topts), GFP_KERNEL); |
577b785f | 7760 | if (!topts) |
37aea98b SRRH |
7761 | return; |
7762 | ||
7763 | tr_topts = krealloc(tr->topts, sizeof(*tr->topts) * (tr->nr_topts + 1), | |
7764 | GFP_KERNEL); | |
7765 | if (!tr_topts) { | |
7766 | kfree(topts); | |
7767 | return; | |
7768 | } | |
7769 | ||
7770 | tr->topts = tr_topts; | |
7771 | tr->topts[tr->nr_topts].tracer = tracer; | |
7772 | tr->topts[tr->nr_topts].topts = topts; | |
7773 | tr->nr_topts++; | |
577b785f | 7774 | |
41d9c0be | 7775 | for (cnt = 0; opts[cnt].name; cnt++) { |
2b6080f2 | 7776 | create_trace_option_file(tr, &topts[cnt], flags, |
577b785f | 7777 | &opts[cnt]); |
41d9c0be SRRH |
7778 | WARN_ONCE(topts[cnt].entry == NULL, |
7779 | "Failed to create trace option: %s", | |
7780 | opts[cnt].name); | |
7781 | } | |
577b785f SR |
7782 | } |
7783 | ||
a8259075 | 7784 | static struct dentry * |
2b6080f2 SR |
7785 | create_trace_option_core_file(struct trace_array *tr, |
7786 | const char *option, long index) | |
a8259075 SR |
7787 | { |
7788 | struct dentry *t_options; | |
a8259075 | 7789 | |
2b6080f2 | 7790 | t_options = trace_options_init_dentry(tr); |
a8259075 SR |
7791 | if (!t_options) |
7792 | return NULL; | |
7793 | ||
9a38a885 SRRH |
7794 | return trace_create_file(option, 0644, t_options, |
7795 | (void *)&tr->trace_flags_index[index], | |
7796 | &trace_options_core_fops); | |
a8259075 SR |
7797 | } |
7798 | ||
16270145 | 7799 | static void create_trace_options_dir(struct trace_array *tr) |
a8259075 SR |
7800 | { |
7801 | struct dentry *t_options; | |
16270145 | 7802 | bool top_level = tr == &global_trace; |
a8259075 SR |
7803 | int i; |
7804 | ||
2b6080f2 | 7805 | t_options = trace_options_init_dentry(tr); |
a8259075 SR |
7806 | if (!t_options) |
7807 | return; | |
7808 | ||
16270145 SRRH |
7809 | for (i = 0; trace_options[i]; i++) { |
7810 | if (top_level || | |
7811 | !((1 << i) & TOP_LEVEL_TRACE_FLAGS)) | |
7812 | create_trace_option_core_file(tr, trace_options[i], i); | |
7813 | } | |
a8259075 SR |
7814 | } |
7815 | ||
499e5470 SR |
7816 | static ssize_t |
7817 | rb_simple_read(struct file *filp, char __user *ubuf, | |
7818 | size_t cnt, loff_t *ppos) | |
7819 | { | |
348f0fc2 | 7820 | struct trace_array *tr = filp->private_data; |
499e5470 SR |
7821 | char buf[64]; |
7822 | int r; | |
7823 | ||
10246fa3 | 7824 | r = tracer_tracing_is_on(tr); |
499e5470 SR |
7825 | r = sprintf(buf, "%d\n", r); |
7826 | ||
7827 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
7828 | } | |
7829 | ||
7830 | static ssize_t | |
7831 | rb_simple_write(struct file *filp, const char __user *ubuf, | |
7832 | size_t cnt, loff_t *ppos) | |
7833 | { | |
348f0fc2 | 7834 | struct trace_array *tr = filp->private_data; |
12883efb | 7835 | struct ring_buffer *buffer = tr->trace_buffer.buffer; |
499e5470 SR |
7836 | unsigned long val; |
7837 | int ret; | |
7838 | ||
7839 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); | |
7840 | if (ret) | |
7841 | return ret; | |
7842 | ||
7843 | if (buffer) { | |
2df8f8a6 | 7844 | mutex_lock(&trace_types_lock); |
f143641b SRV |
7845 | if (!!val == tracer_tracing_is_on(tr)) { |
7846 | val = 0; /* do nothing */ | |
7847 | } else if (val) { | |
10246fa3 | 7848 | tracer_tracing_on(tr); |
2b6080f2 SR |
7849 | if (tr->current_trace->start) |
7850 | tr->current_trace->start(tr); | |
2df8f8a6 | 7851 | } else { |
10246fa3 | 7852 | tracer_tracing_off(tr); |
2b6080f2 SR |
7853 | if (tr->current_trace->stop) |
7854 | tr->current_trace->stop(tr); | |
2df8f8a6 SR |
7855 | } |
7856 | mutex_unlock(&trace_types_lock); | |
499e5470 SR |
7857 | } |
7858 | ||
7859 | (*ppos)++; | |
7860 | ||
7861 | return cnt; | |
7862 | } | |
7863 | ||
7864 | static const struct file_operations rb_simple_fops = { | |
7b85af63 | 7865 | .open = tracing_open_generic_tr, |
499e5470 SR |
7866 | .read = rb_simple_read, |
7867 | .write = rb_simple_write, | |
7b85af63 | 7868 | .release = tracing_release_generic_tr, |
499e5470 SR |
7869 | .llseek = default_llseek, |
7870 | }; | |
7871 | ||
03329f99 SRV |
7872 | static ssize_t |
7873 | buffer_percent_read(struct file *filp, char __user *ubuf, | |
7874 | size_t cnt, loff_t *ppos) | |
7875 | { | |
7876 | struct trace_array *tr = filp->private_data; | |
7877 | char buf[64]; | |
7878 | int r; | |
7879 | ||
7880 | r = tr->buffer_percent; | |
7881 | r = sprintf(buf, "%d\n", r); | |
7882 | ||
7883 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
7884 | } | |
7885 | ||
7886 | static ssize_t | |
7887 | buffer_percent_write(struct file *filp, const char __user *ubuf, | |
7888 | size_t cnt, loff_t *ppos) | |
7889 | { | |
7890 | struct trace_array *tr = filp->private_data; | |
7891 | unsigned long val; | |
7892 | int ret; | |
7893 | ||
7894 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); | |
7895 | if (ret) | |
7896 | return ret; | |
7897 | ||
7898 | if (val > 100) | |
7899 | return -EINVAL; | |
7900 | ||
7901 | if (!val) | |
7902 | val = 1; | |
7903 | ||
7904 | tr->buffer_percent = val; | |
7905 | ||
7906 | (*ppos)++; | |
7907 | ||
7908 | return cnt; | |
7909 | } | |
7910 | ||
7911 | static const struct file_operations buffer_percent_fops = { | |
7912 | .open = tracing_open_generic_tr, | |
7913 | .read = buffer_percent_read, | |
7914 | .write = buffer_percent_write, | |
7915 | .release = tracing_release_generic_tr, | |
7916 | .llseek = default_llseek, | |
7917 | }; | |
7918 | ||
277ba044 SR |
7919 | struct dentry *trace_instance_dir; |
7920 | ||
7921 | static void | |
8434dc93 | 7922 | init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer); |
277ba044 | 7923 | |
55034cd6 SRRH |
7924 | static int |
7925 | allocate_trace_buffer(struct trace_array *tr, struct trace_buffer *buf, int size) | |
277ba044 SR |
7926 | { |
7927 | enum ring_buffer_flags rb_flags; | |
737223fb | 7928 | |
983f938a | 7929 | rb_flags = tr->trace_flags & TRACE_ITER_OVERWRITE ? RB_FL_OVERWRITE : 0; |
737223fb | 7930 | |
dced341b SRRH |
7931 | buf->tr = tr; |
7932 | ||
55034cd6 SRRH |
7933 | buf->buffer = ring_buffer_alloc(size, rb_flags); |
7934 | if (!buf->buffer) | |
7935 | return -ENOMEM; | |
737223fb | 7936 | |
55034cd6 SRRH |
7937 | buf->data = alloc_percpu(struct trace_array_cpu); |
7938 | if (!buf->data) { | |
7939 | ring_buffer_free(buf->buffer); | |
4397f045 | 7940 | buf->buffer = NULL; |
55034cd6 SRRH |
7941 | return -ENOMEM; |
7942 | } | |
737223fb | 7943 | |
737223fb SRRH |
7944 | /* Allocate the first page for all buffers */ |
7945 | set_buffer_entries(&tr->trace_buffer, | |
7946 | ring_buffer_size(tr->trace_buffer.buffer, 0)); | |
7947 | ||
55034cd6 SRRH |
7948 | return 0; |
7949 | } | |
737223fb | 7950 | |
55034cd6 SRRH |
7951 | static int allocate_trace_buffers(struct trace_array *tr, int size) |
7952 | { | |
7953 | int ret; | |
737223fb | 7954 | |
55034cd6 SRRH |
7955 | ret = allocate_trace_buffer(tr, &tr->trace_buffer, size); |
7956 | if (ret) | |
7957 | return ret; | |
737223fb | 7958 | |
55034cd6 SRRH |
7959 | #ifdef CONFIG_TRACER_MAX_TRACE |
7960 | ret = allocate_trace_buffer(tr, &tr->max_buffer, | |
7961 | allocate_snapshot ? size : 1); | |
7962 | if (WARN_ON(ret)) { | |
737223fb | 7963 | ring_buffer_free(tr->trace_buffer.buffer); |
24f2aaf9 | 7964 | tr->trace_buffer.buffer = NULL; |
55034cd6 | 7965 | free_percpu(tr->trace_buffer.data); |
24f2aaf9 | 7966 | tr->trace_buffer.data = NULL; |
55034cd6 SRRH |
7967 | return -ENOMEM; |
7968 | } | |
7969 | tr->allocated_snapshot = allocate_snapshot; | |
737223fb | 7970 | |
55034cd6 SRRH |
7971 | /* |
7972 | * Only the top level trace array gets its snapshot allocated | |
7973 | * from the kernel command line. | |
7974 | */ | |
7975 | allocate_snapshot = false; | |
737223fb | 7976 | #endif |
55034cd6 | 7977 | return 0; |
737223fb SRRH |
7978 | } |
7979 | ||
f0b70cc4 SRRH |
7980 | static void free_trace_buffer(struct trace_buffer *buf) |
7981 | { | |
7982 | if (buf->buffer) { | |
7983 | ring_buffer_free(buf->buffer); | |
7984 | buf->buffer = NULL; | |
7985 | free_percpu(buf->data); | |
7986 | buf->data = NULL; | |
7987 | } | |
7988 | } | |
7989 | ||
23aaa3c1 SRRH |
7990 | static void free_trace_buffers(struct trace_array *tr) |
7991 | { | |
7992 | if (!tr) | |
7993 | return; | |
7994 | ||
f0b70cc4 | 7995 | free_trace_buffer(&tr->trace_buffer); |
23aaa3c1 SRRH |
7996 | |
7997 | #ifdef CONFIG_TRACER_MAX_TRACE | |
f0b70cc4 | 7998 | free_trace_buffer(&tr->max_buffer); |
23aaa3c1 SRRH |
7999 | #endif |
8000 | } | |
8001 | ||
9a38a885 SRRH |
8002 | static void init_trace_flags_index(struct trace_array *tr) |
8003 | { | |
8004 | int i; | |
8005 | ||
8006 | /* Used by the trace options files */ | |
8007 | for (i = 0; i < TRACE_FLAGS_MAX_SIZE; i++) | |
8008 | tr->trace_flags_index[i] = i; | |
8009 | } | |
8010 | ||
37aea98b SRRH |
8011 | static void __update_tracer_options(struct trace_array *tr) |
8012 | { | |
8013 | struct tracer *t; | |
8014 | ||
8015 | for (t = trace_types; t; t = t->next) | |
8016 | add_tracer_options(tr, t); | |
8017 | } | |
8018 | ||
8019 | static void update_tracer_options(struct trace_array *tr) | |
8020 | { | |
8021 | mutex_lock(&trace_types_lock); | |
8022 | __update_tracer_options(tr); | |
8023 | mutex_unlock(&trace_types_lock); | |
8024 | } | |
8025 | ||
eae47358 | 8026 | static int instance_mkdir(const char *name) |
737223fb | 8027 | { |
277ba044 SR |
8028 | struct trace_array *tr; |
8029 | int ret; | |
277ba044 | 8030 | |
12ecef0c | 8031 | mutex_lock(&event_mutex); |
277ba044 SR |
8032 | mutex_lock(&trace_types_lock); |
8033 | ||
8034 | ret = -EEXIST; | |
8035 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
8036 | if (tr->name && strcmp(tr->name, name) == 0) | |
8037 | goto out_unlock; | |
8038 | } | |
8039 | ||
8040 | ret = -ENOMEM; | |
8041 | tr = kzalloc(sizeof(*tr), GFP_KERNEL); | |
8042 | if (!tr) | |
8043 | goto out_unlock; | |
8044 | ||
8045 | tr->name = kstrdup(name, GFP_KERNEL); | |
8046 | if (!tr->name) | |
8047 | goto out_free_tr; | |
8048 | ||
ccfe9e42 AL |
8049 | if (!alloc_cpumask_var(&tr->tracing_cpumask, GFP_KERNEL)) |
8050 | goto out_free_tr; | |
8051 | ||
20550622 | 8052 | tr->trace_flags = global_trace.trace_flags & ~ZEROED_TRACE_FLAGS; |
983f938a | 8053 | |
ccfe9e42 AL |
8054 | cpumask_copy(tr->tracing_cpumask, cpu_all_mask); |
8055 | ||
277ba044 SR |
8056 | raw_spin_lock_init(&tr->start_lock); |
8057 | ||
0b9b12c1 SRRH |
8058 | tr->max_lock = (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED; |
8059 | ||
277ba044 SR |
8060 | tr->current_trace = &nop_trace; |
8061 | ||
8062 | INIT_LIST_HEAD(&tr->systems); | |
8063 | INIT_LIST_HEAD(&tr->events); | |
067fe038 | 8064 | INIT_LIST_HEAD(&tr->hist_vars); |
277ba044 | 8065 | |
737223fb | 8066 | if (allocate_trace_buffers(tr, trace_buf_size) < 0) |
277ba044 SR |
8067 | goto out_free_tr; |
8068 | ||
8434dc93 | 8069 | tr->dir = tracefs_create_dir(name, trace_instance_dir); |
277ba044 SR |
8070 | if (!tr->dir) |
8071 | goto out_free_tr; | |
8072 | ||
8073 | ret = event_trace_add_tracer(tr->dir, tr); | |
609e85a7 | 8074 | if (ret) { |
8434dc93 | 8075 | tracefs_remove_recursive(tr->dir); |
277ba044 | 8076 | goto out_free_tr; |
609e85a7 | 8077 | } |
277ba044 | 8078 | |
04ec7bb6 SRV |
8079 | ftrace_init_trace_array(tr); |
8080 | ||
8434dc93 | 8081 | init_tracer_tracefs(tr, tr->dir); |
9a38a885 | 8082 | init_trace_flags_index(tr); |
37aea98b | 8083 | __update_tracer_options(tr); |
277ba044 SR |
8084 | |
8085 | list_add(&tr->list, &ftrace_trace_arrays); | |
8086 | ||
8087 | mutex_unlock(&trace_types_lock); | |
12ecef0c | 8088 | mutex_unlock(&event_mutex); |
277ba044 SR |
8089 | |
8090 | return 0; | |
8091 | ||
8092 | out_free_tr: | |
23aaa3c1 | 8093 | free_trace_buffers(tr); |
ccfe9e42 | 8094 | free_cpumask_var(tr->tracing_cpumask); |
277ba044 SR |
8095 | kfree(tr->name); |
8096 | kfree(tr); | |
8097 | ||
8098 | out_unlock: | |
8099 | mutex_unlock(&trace_types_lock); | |
12ecef0c | 8100 | mutex_unlock(&event_mutex); |
277ba044 SR |
8101 | |
8102 | return ret; | |
8103 | ||
8104 | } | |
8105 | ||
eae47358 | 8106 | static int instance_rmdir(const char *name) |
0c8916c3 SR |
8107 | { |
8108 | struct trace_array *tr; | |
8109 | int found = 0; | |
8110 | int ret; | |
37aea98b | 8111 | int i; |
0c8916c3 | 8112 | |
12ecef0c | 8113 | mutex_lock(&event_mutex); |
0c8916c3 SR |
8114 | mutex_lock(&trace_types_lock); |
8115 | ||
8116 | ret = -ENODEV; | |
8117 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
8118 | if (tr->name && strcmp(tr->name, name) == 0) { | |
8119 | found = 1; | |
8120 | break; | |
8121 | } | |
8122 | } | |
8123 | if (!found) | |
8124 | goto out_unlock; | |
8125 | ||
a695cb58 | 8126 | ret = -EBUSY; |
cf6ab6d9 | 8127 | if (tr->ref || (tr->current_trace && tr->current_trace->ref)) |
a695cb58 SRRH |
8128 | goto out_unlock; |
8129 | ||
0c8916c3 SR |
8130 | list_del(&tr->list); |
8131 | ||
20550622 SRRH |
8132 | /* Disable all the flags that were enabled coming in */ |
8133 | for (i = 0; i < TRACE_FLAGS_MAX_SIZE; i++) { | |
8134 | if ((1 << i) & ZEROED_TRACE_FLAGS) | |
8135 | set_tracer_flag(tr, 1 << i, 0); | |
8136 | } | |
8137 | ||
6b450d25 | 8138 | tracing_set_nop(tr); |
a0e6369e | 8139 | clear_ftrace_function_probes(tr); |
0c8916c3 | 8140 | event_trace_del_tracer(tr); |
d879d0b8 | 8141 | ftrace_clear_pids(tr); |
591dffda | 8142 | ftrace_destroy_function_files(tr); |
681a4a2f | 8143 | tracefs_remove_recursive(tr->dir); |
a9fcaaac | 8144 | free_trace_buffers(tr); |
0c8916c3 | 8145 | |
37aea98b SRRH |
8146 | for (i = 0; i < tr->nr_topts; i++) { |
8147 | kfree(tr->topts[i].topts); | |
8148 | } | |
8149 | kfree(tr->topts); | |
8150 | ||
db9108e0 | 8151 | free_cpumask_var(tr->tracing_cpumask); |
0c8916c3 SR |
8152 | kfree(tr->name); |
8153 | kfree(tr); | |
8154 | ||
8155 | ret = 0; | |
8156 | ||
8157 | out_unlock: | |
8158 | mutex_unlock(&trace_types_lock); | |
12ecef0c | 8159 | mutex_unlock(&event_mutex); |
0c8916c3 SR |
8160 | |
8161 | return ret; | |
8162 | } | |
8163 | ||
277ba044 SR |
8164 | static __init void create_trace_instances(struct dentry *d_tracer) |
8165 | { | |
eae47358 SRRH |
8166 | trace_instance_dir = tracefs_create_instance_dir("instances", d_tracer, |
8167 | instance_mkdir, | |
8168 | instance_rmdir); | |
277ba044 SR |
8169 | if (WARN_ON(!trace_instance_dir)) |
8170 | return; | |
277ba044 SR |
8171 | } |
8172 | ||
2b6080f2 | 8173 | static void |
8434dc93 | 8174 | init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer) |
2b6080f2 | 8175 | { |
3dd80953 | 8176 | struct trace_event_file *file; |
121aaee7 | 8177 | int cpu; |
2b6080f2 | 8178 | |
607e2ea1 SRRH |
8179 | trace_create_file("available_tracers", 0444, d_tracer, |
8180 | tr, &show_traces_fops); | |
8181 | ||
8182 | trace_create_file("current_tracer", 0644, d_tracer, | |
8183 | tr, &set_tracer_fops); | |
8184 | ||
ccfe9e42 AL |
8185 | trace_create_file("tracing_cpumask", 0644, d_tracer, |
8186 | tr, &tracing_cpumask_fops); | |
8187 | ||
2b6080f2 SR |
8188 | trace_create_file("trace_options", 0644, d_tracer, |
8189 | tr, &tracing_iter_fops); | |
8190 | ||
8191 | trace_create_file("trace", 0644, d_tracer, | |
6484c71c | 8192 | tr, &tracing_fops); |
2b6080f2 SR |
8193 | |
8194 | trace_create_file("trace_pipe", 0444, d_tracer, | |
15544209 | 8195 | tr, &tracing_pipe_fops); |
2b6080f2 SR |
8196 | |
8197 | trace_create_file("buffer_size_kb", 0644, d_tracer, | |
0bc392ee | 8198 | tr, &tracing_entries_fops); |
2b6080f2 SR |
8199 | |
8200 | trace_create_file("buffer_total_size_kb", 0444, d_tracer, | |
8201 | tr, &tracing_total_entries_fops); | |
8202 | ||
238ae93d | 8203 | trace_create_file("free_buffer", 0200, d_tracer, |
2b6080f2 SR |
8204 | tr, &tracing_free_buffer_fops); |
8205 | ||
8206 | trace_create_file("trace_marker", 0220, d_tracer, | |
8207 | tr, &tracing_mark_fops); | |
8208 | ||
3dd80953 SRV |
8209 | file = __find_event_file(tr, "ftrace", "print"); |
8210 | if (file && file->dir) | |
8211 | trace_create_file("trigger", 0644, file->dir, file, | |
8212 | &event_trigger_fops); | |
8213 | tr->trace_marker_file = file; | |
8214 | ||
fa32e855 SR |
8215 | trace_create_file("trace_marker_raw", 0220, d_tracer, |
8216 | tr, &tracing_mark_raw_fops); | |
8217 | ||
2b6080f2 SR |
8218 | trace_create_file("trace_clock", 0644, d_tracer, tr, |
8219 | &trace_clock_fops); | |
8220 | ||
8221 | trace_create_file("tracing_on", 0644, d_tracer, | |
6484c71c | 8222 | tr, &rb_simple_fops); |
ce9bae55 | 8223 | |
2c1ea60b TZ |
8224 | trace_create_file("timestamp_mode", 0444, d_tracer, tr, |
8225 | &trace_time_stamp_mode_fops); | |
8226 | ||
a7b1d74e | 8227 | tr->buffer_percent = 50; |
03329f99 SRV |
8228 | |
8229 | trace_create_file("buffer_percent", 0444, d_tracer, | |
8230 | tr, &buffer_percent_fops); | |
8231 | ||
16270145 SRRH |
8232 | create_trace_options_dir(tr); |
8233 | ||
f971cc9a | 8234 | #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) |
6d9b3fa5 SRRH |
8235 | trace_create_file("tracing_max_latency", 0644, d_tracer, |
8236 | &tr->max_latency, &tracing_max_lat_fops); | |
8237 | #endif | |
8238 | ||
591dffda SRRH |
8239 | if (ftrace_create_function_files(tr, d_tracer)) |
8240 | WARN(1, "Could not allocate function filter files"); | |
8241 | ||
ce9bae55 SRRH |
8242 | #ifdef CONFIG_TRACER_SNAPSHOT |
8243 | trace_create_file("snapshot", 0644, d_tracer, | |
6484c71c | 8244 | tr, &snapshot_fops); |
ce9bae55 | 8245 | #endif |
121aaee7 SRRH |
8246 | |
8247 | for_each_tracing_cpu(cpu) | |
8434dc93 | 8248 | tracing_init_tracefs_percpu(tr, cpu); |
121aaee7 | 8249 | |
345ddcc8 | 8250 | ftrace_init_tracefs(tr, d_tracer); |
2b6080f2 SR |
8251 | } |
8252 | ||
93faccbb | 8253 | static struct vfsmount *trace_automount(struct dentry *mntpt, void *ingore) |
f76180bc SRRH |
8254 | { |
8255 | struct vfsmount *mnt; | |
8256 | struct file_system_type *type; | |
8257 | ||
8258 | /* | |
8259 | * To maintain backward compatibility for tools that mount | |
8260 | * debugfs to get to the tracing facility, tracefs is automatically | |
8261 | * mounted to the debugfs/tracing directory. | |
8262 | */ | |
8263 | type = get_fs_type("tracefs"); | |
8264 | if (!type) | |
8265 | return NULL; | |
93faccbb | 8266 | mnt = vfs_submount(mntpt, type, "tracefs", NULL); |
f76180bc SRRH |
8267 | put_filesystem(type); |
8268 | if (IS_ERR(mnt)) | |
8269 | return NULL; | |
8270 | mntget(mnt); | |
8271 | ||
8272 | return mnt; | |
8273 | } | |
8274 | ||
7eeafbca SRRH |
8275 | /** |
8276 | * tracing_init_dentry - initialize top level trace array | |
8277 | * | |
8278 | * This is called when creating files or directories in the tracing | |
8279 | * directory. It is called via fs_initcall() by any of the boot up code | |
8280 | * and expects to return the dentry of the top level tracing directory. | |
8281 | */ | |
8282 | struct dentry *tracing_init_dentry(void) | |
8283 | { | |
8284 | struct trace_array *tr = &global_trace; | |
8285 | ||
f76180bc | 8286 | /* The top level trace array uses NULL as parent */ |
7eeafbca | 8287 | if (tr->dir) |
f76180bc | 8288 | return NULL; |
7eeafbca | 8289 | |
8b129199 JW |
8290 | if (WARN_ON(!tracefs_initialized()) || |
8291 | (IS_ENABLED(CONFIG_DEBUG_FS) && | |
8292 | WARN_ON(!debugfs_initialized()))) | |
7eeafbca SRRH |
8293 | return ERR_PTR(-ENODEV); |
8294 | ||
f76180bc SRRH |
8295 | /* |
8296 | * As there may still be users that expect the tracing | |
8297 | * files to exist in debugfs/tracing, we must automount | |
8298 | * the tracefs file system there, so older tools still | |
8299 | * work with the newer kerenl. | |
8300 | */ | |
8301 | tr->dir = debugfs_create_automount("tracing", NULL, | |
8302 | trace_automount, NULL); | |
7eeafbca SRRH |
8303 | if (!tr->dir) { |
8304 | pr_warn_once("Could not create debugfs directory 'tracing'\n"); | |
8305 | return ERR_PTR(-ENOMEM); | |
8306 | } | |
8307 | ||
8434dc93 | 8308 | return NULL; |
7eeafbca SRRH |
8309 | } |
8310 | ||
00f4b652 JL |
8311 | extern struct trace_eval_map *__start_ftrace_eval_maps[]; |
8312 | extern struct trace_eval_map *__stop_ftrace_eval_maps[]; | |
0c564a53 | 8313 | |
5f60b351 | 8314 | static void __init trace_eval_init(void) |
0c564a53 | 8315 | { |
3673b8e4 SRRH |
8316 | int len; |
8317 | ||
02fd7f68 | 8318 | len = __stop_ftrace_eval_maps - __start_ftrace_eval_maps; |
f57a4143 | 8319 | trace_insert_eval_map(NULL, __start_ftrace_eval_maps, len); |
3673b8e4 SRRH |
8320 | } |
8321 | ||
8322 | #ifdef CONFIG_MODULES | |
f57a4143 | 8323 | static void trace_module_add_evals(struct module *mod) |
3673b8e4 | 8324 | { |
99be647c | 8325 | if (!mod->num_trace_evals) |
3673b8e4 SRRH |
8326 | return; |
8327 | ||
8328 | /* | |
8329 | * Modules with bad taint do not have events created, do | |
8330 | * not bother with enums either. | |
8331 | */ | |
8332 | if (trace_module_has_bad_taint(mod)) | |
8333 | return; | |
8334 | ||
f57a4143 | 8335 | trace_insert_eval_map(mod, mod->trace_evals, mod->num_trace_evals); |
3673b8e4 SRRH |
8336 | } |
8337 | ||
681bec03 | 8338 | #ifdef CONFIG_TRACE_EVAL_MAP_FILE |
f57a4143 | 8339 | static void trace_module_remove_evals(struct module *mod) |
9828413d | 8340 | { |
23bf8cb8 JL |
8341 | union trace_eval_map_item *map; |
8342 | union trace_eval_map_item **last = &trace_eval_maps; | |
9828413d | 8343 | |
99be647c | 8344 | if (!mod->num_trace_evals) |
9828413d SRRH |
8345 | return; |
8346 | ||
1793ed93 | 8347 | mutex_lock(&trace_eval_mutex); |
9828413d | 8348 | |
23bf8cb8 | 8349 | map = trace_eval_maps; |
9828413d SRRH |
8350 | |
8351 | while (map) { | |
8352 | if (map->head.mod == mod) | |
8353 | break; | |
5f60b351 | 8354 | map = trace_eval_jmp_to_tail(map); |
9828413d SRRH |
8355 | last = &map->tail.next; |
8356 | map = map->tail.next; | |
8357 | } | |
8358 | if (!map) | |
8359 | goto out; | |
8360 | ||
5f60b351 | 8361 | *last = trace_eval_jmp_to_tail(map)->tail.next; |
9828413d SRRH |
8362 | kfree(map); |
8363 | out: | |
1793ed93 | 8364 | mutex_unlock(&trace_eval_mutex); |
9828413d SRRH |
8365 | } |
8366 | #else | |
f57a4143 | 8367 | static inline void trace_module_remove_evals(struct module *mod) { } |
681bec03 | 8368 | #endif /* CONFIG_TRACE_EVAL_MAP_FILE */ |
9828413d | 8369 | |
3673b8e4 SRRH |
8370 | static int trace_module_notify(struct notifier_block *self, |
8371 | unsigned long val, void *data) | |
8372 | { | |
8373 | struct module *mod = data; | |
8374 | ||
8375 | switch (val) { | |
8376 | case MODULE_STATE_COMING: | |
f57a4143 | 8377 | trace_module_add_evals(mod); |
3673b8e4 | 8378 | break; |
9828413d | 8379 | case MODULE_STATE_GOING: |
f57a4143 | 8380 | trace_module_remove_evals(mod); |
9828413d | 8381 | break; |
3673b8e4 SRRH |
8382 | } |
8383 | ||
8384 | return 0; | |
0c564a53 SRRH |
8385 | } |
8386 | ||
3673b8e4 SRRH |
8387 | static struct notifier_block trace_module_nb = { |
8388 | .notifier_call = trace_module_notify, | |
8389 | .priority = 0, | |
8390 | }; | |
9828413d | 8391 | #endif /* CONFIG_MODULES */ |
3673b8e4 | 8392 | |
8434dc93 | 8393 | static __init int tracer_init_tracefs(void) |
bc0c38d1 SR |
8394 | { |
8395 | struct dentry *d_tracer; | |
bc0c38d1 | 8396 | |
7e53bd42 LJ |
8397 | trace_access_lock_init(); |
8398 | ||
bc0c38d1 | 8399 | d_tracer = tracing_init_dentry(); |
14a5ae40 | 8400 | if (IS_ERR(d_tracer)) |
ed6f1c99 | 8401 | return 0; |
bc0c38d1 | 8402 | |
58b92547 SRV |
8403 | event_trace_init(); |
8404 | ||
8434dc93 | 8405 | init_tracer_tracefs(&global_trace, d_tracer); |
501c2375 | 8406 | ftrace_init_tracefs_toplevel(&global_trace, d_tracer); |
bc0c38d1 | 8407 | |
5452af66 | 8408 | trace_create_file("tracing_thresh", 0644, d_tracer, |
6508fa76 | 8409 | &global_trace, &tracing_thresh_fops); |
a8259075 | 8410 | |
339ae5d3 | 8411 | trace_create_file("README", 0444, d_tracer, |
5452af66 FW |
8412 | NULL, &tracing_readme_fops); |
8413 | ||
69abe6a5 AP |
8414 | trace_create_file("saved_cmdlines", 0444, d_tracer, |
8415 | NULL, &tracing_saved_cmdlines_fops); | |
5bf9a1ee | 8416 | |
939c7a4f YY |
8417 | trace_create_file("saved_cmdlines_size", 0644, d_tracer, |
8418 | NULL, &tracing_saved_cmdlines_size_fops); | |
8419 | ||
99c621d7 MS |
8420 | trace_create_file("saved_tgids", 0444, d_tracer, |
8421 | NULL, &tracing_saved_tgids_fops); | |
8422 | ||
5f60b351 | 8423 | trace_eval_init(); |
0c564a53 | 8424 | |
f57a4143 | 8425 | trace_create_eval_file(d_tracer); |
9828413d | 8426 | |
3673b8e4 SRRH |
8427 | #ifdef CONFIG_MODULES |
8428 | register_module_notifier(&trace_module_nb); | |
8429 | #endif | |
8430 | ||
bc0c38d1 | 8431 | #ifdef CONFIG_DYNAMIC_FTRACE |
5452af66 FW |
8432 | trace_create_file("dyn_ftrace_total_info", 0444, d_tracer, |
8433 | &ftrace_update_tot_cnt, &tracing_dyn_info_fops); | |
bc0c38d1 | 8434 | #endif |
b04cc6b1 | 8435 | |
277ba044 | 8436 | create_trace_instances(d_tracer); |
5452af66 | 8437 | |
37aea98b | 8438 | update_tracer_options(&global_trace); |
09d23a1d | 8439 | |
b5ad384e | 8440 | return 0; |
bc0c38d1 SR |
8441 | } |
8442 | ||
3f5a54e3 SR |
8443 | static int trace_panic_handler(struct notifier_block *this, |
8444 | unsigned long event, void *unused) | |
8445 | { | |
944ac425 | 8446 | if (ftrace_dump_on_oops) |
cecbca96 | 8447 | ftrace_dump(ftrace_dump_on_oops); |
3f5a54e3 SR |
8448 | return NOTIFY_OK; |
8449 | } | |
8450 | ||
8451 | static struct notifier_block trace_panic_notifier = { | |
8452 | .notifier_call = trace_panic_handler, | |
8453 | .next = NULL, | |
8454 | .priority = 150 /* priority: INT_MAX >= x >= 0 */ | |
8455 | }; | |
8456 | ||
8457 | static int trace_die_handler(struct notifier_block *self, | |
8458 | unsigned long val, | |
8459 | void *data) | |
8460 | { | |
8461 | switch (val) { | |
8462 | case DIE_OOPS: | |
944ac425 | 8463 | if (ftrace_dump_on_oops) |
cecbca96 | 8464 | ftrace_dump(ftrace_dump_on_oops); |
3f5a54e3 SR |
8465 | break; |
8466 | default: | |
8467 | break; | |
8468 | } | |
8469 | return NOTIFY_OK; | |
8470 | } | |
8471 | ||
8472 | static struct notifier_block trace_die_notifier = { | |
8473 | .notifier_call = trace_die_handler, | |
8474 | .priority = 200 | |
8475 | }; | |
8476 | ||
8477 | /* | |
8478 | * printk is set to max of 1024, we really don't need it that big. | |
8479 | * Nothing should be printing 1000 characters anyway. | |
8480 | */ | |
8481 | #define TRACE_MAX_PRINT 1000 | |
8482 | ||
8483 | /* | |
8484 | * Define here KERN_TRACE so that we have one place to modify | |
8485 | * it if we decide to change what log level the ftrace dump | |
8486 | * should be at. | |
8487 | */ | |
428aee14 | 8488 | #define KERN_TRACE KERN_EMERG |
3f5a54e3 | 8489 | |
955b61e5 | 8490 | void |
3f5a54e3 SR |
8491 | trace_printk_seq(struct trace_seq *s) |
8492 | { | |
8493 | /* Probably should print a warning here. */ | |
3a161d99 SRRH |
8494 | if (s->seq.len >= TRACE_MAX_PRINT) |
8495 | s->seq.len = TRACE_MAX_PRINT; | |
3f5a54e3 | 8496 | |
820b75f6 SRRH |
8497 | /* |
8498 | * More paranoid code. Although the buffer size is set to | |
8499 | * PAGE_SIZE, and TRACE_MAX_PRINT is 1000, this is just | |
8500 | * an extra layer of protection. | |
8501 | */ | |
8502 | if (WARN_ON_ONCE(s->seq.len >= s->seq.size)) | |
8503 | s->seq.len = s->seq.size - 1; | |
3f5a54e3 SR |
8504 | |
8505 | /* should be zero ended, but we are paranoid. */ | |
3a161d99 | 8506 | s->buffer[s->seq.len] = 0; |
3f5a54e3 SR |
8507 | |
8508 | printk(KERN_TRACE "%s", s->buffer); | |
8509 | ||
f9520750 | 8510 | trace_seq_init(s); |
3f5a54e3 SR |
8511 | } |
8512 | ||
955b61e5 JW |
8513 | void trace_init_global_iter(struct trace_iterator *iter) |
8514 | { | |
8515 | iter->tr = &global_trace; | |
2b6080f2 | 8516 | iter->trace = iter->tr->current_trace; |
ae3b5093 | 8517 | iter->cpu_file = RING_BUFFER_ALL_CPUS; |
12883efb | 8518 | iter->trace_buffer = &global_trace.trace_buffer; |
b2f974d6 CS |
8519 | |
8520 | if (iter->trace && iter->trace->open) | |
8521 | iter->trace->open(iter); | |
8522 | ||
8523 | /* Annotate start of buffers if we had overruns */ | |
8524 | if (ring_buffer_overruns(iter->trace_buffer->buffer)) | |
8525 | iter->iter_flags |= TRACE_FILE_ANNOTATE; | |
8526 | ||
8527 | /* Output in nanoseconds only if we are using a clock in nanoseconds. */ | |
8528 | if (trace_clocks[iter->tr->clock_id].in_ns) | |
8529 | iter->iter_flags |= TRACE_FILE_TIME_IN_NS; | |
955b61e5 JW |
8530 | } |
8531 | ||
7fe70b57 | 8532 | void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) |
3f5a54e3 | 8533 | { |
3f5a54e3 SR |
8534 | /* use static because iter can be a bit big for the stack */ |
8535 | static struct trace_iterator iter; | |
7fe70b57 | 8536 | static atomic_t dump_running; |
983f938a | 8537 | struct trace_array *tr = &global_trace; |
cf586b61 | 8538 | unsigned int old_userobj; |
d769041f SR |
8539 | unsigned long flags; |
8540 | int cnt = 0, cpu; | |
3f5a54e3 | 8541 | |
7fe70b57 SRRH |
8542 | /* Only allow one dump user at a time. */ |
8543 | if (atomic_inc_return(&dump_running) != 1) { | |
8544 | atomic_dec(&dump_running); | |
8545 | return; | |
8546 | } | |
3f5a54e3 | 8547 | |
7fe70b57 SRRH |
8548 | /* |
8549 | * Always turn off tracing when we dump. | |
8550 | * We don't need to show trace output of what happens | |
8551 | * between multiple crashes. | |
8552 | * | |
8553 | * If the user does a sysrq-z, then they can re-enable | |
8554 | * tracing with echo 1 > tracing_on. | |
8555 | */ | |
0ee6b6cf | 8556 | tracing_off(); |
cf586b61 | 8557 | |
7fe70b57 | 8558 | local_irq_save(flags); |
03fc7f9c | 8559 | printk_nmi_direct_enter(); |
3f5a54e3 | 8560 | |
38dbe0b1 | 8561 | /* Simulate the iterator */ |
955b61e5 JW |
8562 | trace_init_global_iter(&iter); |
8563 | ||
d769041f | 8564 | for_each_tracing_cpu(cpu) { |
5e2d5ef8 | 8565 | atomic_inc(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled); |
d769041f SR |
8566 | } |
8567 | ||
983f938a | 8568 | old_userobj = tr->trace_flags & TRACE_ITER_SYM_USEROBJ; |
cf586b61 | 8569 | |
b54d3de9 | 8570 | /* don't look at user memory in panic mode */ |
983f938a | 8571 | tr->trace_flags &= ~TRACE_ITER_SYM_USEROBJ; |
b54d3de9 | 8572 | |
cecbca96 FW |
8573 | switch (oops_dump_mode) { |
8574 | case DUMP_ALL: | |
ae3b5093 | 8575 | iter.cpu_file = RING_BUFFER_ALL_CPUS; |
cecbca96 FW |
8576 | break; |
8577 | case DUMP_ORIG: | |
8578 | iter.cpu_file = raw_smp_processor_id(); | |
8579 | break; | |
8580 | case DUMP_NONE: | |
8581 | goto out_enable; | |
8582 | default: | |
8583 | printk(KERN_TRACE "Bad dumping mode, switching to all CPUs dump\n"); | |
ae3b5093 | 8584 | iter.cpu_file = RING_BUFFER_ALL_CPUS; |
cecbca96 FW |
8585 | } |
8586 | ||
8587 | printk(KERN_TRACE "Dumping ftrace buffer:\n"); | |
3f5a54e3 | 8588 | |
7fe70b57 SRRH |
8589 | /* Did function tracer already get disabled? */ |
8590 | if (ftrace_is_dead()) { | |
8591 | printk("# WARNING: FUNCTION TRACING IS CORRUPTED\n"); | |
8592 | printk("# MAY BE MISSING FUNCTION EVENTS\n"); | |
8593 | } | |
8594 | ||
3f5a54e3 SR |
8595 | /* |
8596 | * We need to stop all tracing on all CPUS to read the | |
8597 | * the next buffer. This is a bit expensive, but is | |
8598 | * not done often. We fill all what we can read, | |
8599 | * and then release the locks again. | |
8600 | */ | |
8601 | ||
3f5a54e3 SR |
8602 | while (!trace_empty(&iter)) { |
8603 | ||
8604 | if (!cnt) | |
8605 | printk(KERN_TRACE "---------------------------------\n"); | |
8606 | ||
8607 | cnt++; | |
8608 | ||
8609 | /* reset all but tr, trace, and overruns */ | |
8610 | memset(&iter.seq, 0, | |
8611 | sizeof(struct trace_iterator) - | |
8612 | offsetof(struct trace_iterator, seq)); | |
8613 | iter.iter_flags |= TRACE_FILE_LAT_FMT; | |
8614 | iter.pos = -1; | |
8615 | ||
955b61e5 | 8616 | if (trace_find_next_entry_inc(&iter) != NULL) { |
74e7ff8c LJ |
8617 | int ret; |
8618 | ||
8619 | ret = print_trace_line(&iter); | |
8620 | if (ret != TRACE_TYPE_NO_CONSUME) | |
8621 | trace_consume(&iter); | |
3f5a54e3 | 8622 | } |
b892e5c8 | 8623 | touch_nmi_watchdog(); |
3f5a54e3 SR |
8624 | |
8625 | trace_printk_seq(&iter.seq); | |
8626 | } | |
8627 | ||
8628 | if (!cnt) | |
8629 | printk(KERN_TRACE " (ftrace buffer empty)\n"); | |
8630 | else | |
8631 | printk(KERN_TRACE "---------------------------------\n"); | |
8632 | ||
cecbca96 | 8633 | out_enable: |
983f938a | 8634 | tr->trace_flags |= old_userobj; |
cf586b61 | 8635 | |
7fe70b57 SRRH |
8636 | for_each_tracing_cpu(cpu) { |
8637 | atomic_dec(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled); | |
cf586b61 | 8638 | } |
03fc7f9c PM |
8639 | atomic_dec(&dump_running); |
8640 | printk_nmi_direct_exit(); | |
cd891ae0 | 8641 | local_irq_restore(flags); |
3f5a54e3 | 8642 | } |
a8eecf22 | 8643 | EXPORT_SYMBOL_GPL(ftrace_dump); |
cf586b61 | 8644 | |
7e465baa TZ |
8645 | int trace_run_command(const char *buf, int (*createfn)(int, char **)) |
8646 | { | |
8647 | char **argv; | |
8648 | int argc, ret; | |
8649 | ||
8650 | argc = 0; | |
8651 | ret = 0; | |
8652 | argv = argv_split(GFP_KERNEL, buf, &argc); | |
8653 | if (!argv) | |
8654 | return -ENOMEM; | |
8655 | ||
8656 | if (argc) | |
8657 | ret = createfn(argc, argv); | |
8658 | ||
8659 | argv_free(argv); | |
8660 | ||
8661 | return ret; | |
8662 | } | |
8663 | ||
8664 | #define WRITE_BUFSIZE 4096 | |
8665 | ||
8666 | ssize_t trace_parse_run_command(struct file *file, const char __user *buffer, | |
8667 | size_t count, loff_t *ppos, | |
8668 | int (*createfn)(int, char **)) | |
8669 | { | |
8670 | char *kbuf, *buf, *tmp; | |
8671 | int ret = 0; | |
8672 | size_t done = 0; | |
8673 | size_t size; | |
8674 | ||
8675 | kbuf = kmalloc(WRITE_BUFSIZE, GFP_KERNEL); | |
8676 | if (!kbuf) | |
8677 | return -ENOMEM; | |
8678 | ||
8679 | while (done < count) { | |
8680 | size = count - done; | |
8681 | ||
8682 | if (size >= WRITE_BUFSIZE) | |
8683 | size = WRITE_BUFSIZE - 1; | |
8684 | ||
8685 | if (copy_from_user(kbuf, buffer + done, size)) { | |
8686 | ret = -EFAULT; | |
8687 | goto out; | |
8688 | } | |
8689 | kbuf[size] = '\0'; | |
8690 | buf = kbuf; | |
8691 | do { | |
8692 | tmp = strchr(buf, '\n'); | |
8693 | if (tmp) { | |
8694 | *tmp = '\0'; | |
8695 | size = tmp - buf + 1; | |
8696 | } else { | |
8697 | size = strlen(buf); | |
8698 | if (done + size < count) { | |
8699 | if (buf != kbuf) | |
8700 | break; | |
8701 | /* This can accept WRITE_BUFSIZE - 2 ('\n' + '\0') */ | |
8702 | pr_warn("Line length is too long: Should be less than %d\n", | |
8703 | WRITE_BUFSIZE - 2); | |
8704 | ret = -EINVAL; | |
8705 | goto out; | |
8706 | } | |
8707 | } | |
8708 | done += size; | |
8709 | ||
8710 | /* Remove comments */ | |
8711 | tmp = strchr(buf, '#'); | |
8712 | ||
8713 | if (tmp) | |
8714 | *tmp = '\0'; | |
8715 | ||
8716 | ret = trace_run_command(buf, createfn); | |
8717 | if (ret) | |
8718 | goto out; | |
8719 | buf += size; | |
8720 | ||
8721 | } while (done < count); | |
8722 | } | |
8723 | ret = done; | |
8724 | ||
8725 | out: | |
8726 | kfree(kbuf); | |
8727 | ||
8728 | return ret; | |
8729 | } | |
8730 | ||
3928a8a2 | 8731 | __init static int tracer_alloc_buffers(void) |
bc0c38d1 | 8732 | { |
73c5162a | 8733 | int ring_buf_size; |
9e01c1b7 | 8734 | int ret = -ENOMEM; |
4c11d7ae | 8735 | |
b5e87c05 SRRH |
8736 | /* |
8737 | * Make sure we don't accidently add more trace options | |
8738 | * than we have bits for. | |
8739 | */ | |
9a38a885 | 8740 | BUILD_BUG_ON(TRACE_ITER_LAST_BIT > TRACE_FLAGS_MAX_SIZE); |
b5e87c05 | 8741 | |
9e01c1b7 RR |
8742 | if (!alloc_cpumask_var(&tracing_buffer_mask, GFP_KERNEL)) |
8743 | goto out; | |
8744 | ||
ccfe9e42 | 8745 | if (!alloc_cpumask_var(&global_trace.tracing_cpumask, GFP_KERNEL)) |
9e01c1b7 | 8746 | goto out_free_buffer_mask; |
4c11d7ae | 8747 | |
07d777fe SR |
8748 | /* Only allocate trace_printk buffers if a trace_printk exists */ |
8749 | if (__stop___trace_bprintk_fmt != __start___trace_bprintk_fmt) | |
81698831 | 8750 | /* Must be called before global_trace.buffer is allocated */ |
07d777fe SR |
8751 | trace_printk_init_buffers(); |
8752 | ||
73c5162a SR |
8753 | /* To save memory, keep the ring buffer size to its minimum */ |
8754 | if (ring_buffer_expanded) | |
8755 | ring_buf_size = trace_buf_size; | |
8756 | else | |
8757 | ring_buf_size = 1; | |
8758 | ||
9e01c1b7 | 8759 | cpumask_copy(tracing_buffer_mask, cpu_possible_mask); |
ccfe9e42 | 8760 | cpumask_copy(global_trace.tracing_cpumask, cpu_all_mask); |
9e01c1b7 | 8761 | |
2b6080f2 SR |
8762 | raw_spin_lock_init(&global_trace.start_lock); |
8763 | ||
b32614c0 SAS |
8764 | /* |
8765 | * The prepare callbacks allocates some memory for the ring buffer. We | |
8766 | * don't free the buffer if the if the CPU goes down. If we were to free | |
8767 | * the buffer, then the user would lose any trace that was in the | |
8768 | * buffer. The memory will be removed once the "instance" is removed. | |
8769 | */ | |
8770 | ret = cpuhp_setup_state_multi(CPUHP_TRACE_RB_PREPARE, | |
8771 | "trace/RB:preapre", trace_rb_cpu_prepare, | |
8772 | NULL); | |
8773 | if (ret < 0) | |
8774 | goto out_free_cpumask; | |
2c4a33ab | 8775 | /* Used for event triggers */ |
147d88e0 | 8776 | ret = -ENOMEM; |
2c4a33ab SRRH |
8777 | temp_buffer = ring_buffer_alloc(PAGE_SIZE, RB_FL_OVERWRITE); |
8778 | if (!temp_buffer) | |
b32614c0 | 8779 | goto out_rm_hp_state; |
2c4a33ab | 8780 | |
939c7a4f YY |
8781 | if (trace_create_savedcmd() < 0) |
8782 | goto out_free_temp_buffer; | |
8783 | ||
9e01c1b7 | 8784 | /* TODO: make the number of buffers hot pluggable with CPUS */ |
737223fb | 8785 | if (allocate_trace_buffers(&global_trace, ring_buf_size) < 0) { |
3928a8a2 SR |
8786 | printk(KERN_ERR "tracer: failed to allocate ring buffer!\n"); |
8787 | WARN_ON(1); | |
939c7a4f | 8788 | goto out_free_savedcmd; |
4c11d7ae | 8789 | } |
a7603ff4 | 8790 | |
499e5470 SR |
8791 | if (global_trace.buffer_disabled) |
8792 | tracing_off(); | |
4c11d7ae | 8793 | |
e1e232ca SR |
8794 | if (trace_boot_clock) { |
8795 | ret = tracing_set_clock(&global_trace, trace_boot_clock); | |
8796 | if (ret < 0) | |
a395d6a7 JP |
8797 | pr_warn("Trace clock %s not defined, going back to default\n", |
8798 | trace_boot_clock); | |
e1e232ca SR |
8799 | } |
8800 | ||
ca164318 SRRH |
8801 | /* |
8802 | * register_tracer() might reference current_trace, so it | |
8803 | * needs to be set before we register anything. This is | |
8804 | * just a bootstrap of current_trace anyway. | |
8805 | */ | |
2b6080f2 SR |
8806 | global_trace.current_trace = &nop_trace; |
8807 | ||
0b9b12c1 SRRH |
8808 | global_trace.max_lock = (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED; |
8809 | ||
4104d326 SRRH |
8810 | ftrace_init_global_array_ops(&global_trace); |
8811 | ||
9a38a885 SRRH |
8812 | init_trace_flags_index(&global_trace); |
8813 | ||
ca164318 SRRH |
8814 | register_tracer(&nop_trace); |
8815 | ||
dbeafd0d SRV |
8816 | /* Function tracing may start here (via kernel command line) */ |
8817 | init_function_trace(); | |
8818 | ||
60a11774 SR |
8819 | /* All seems OK, enable tracing */ |
8820 | tracing_disabled = 0; | |
3928a8a2 | 8821 | |
3f5a54e3 SR |
8822 | atomic_notifier_chain_register(&panic_notifier_list, |
8823 | &trace_panic_notifier); | |
8824 | ||
8825 | register_die_notifier(&trace_die_notifier); | |
2fc1dfbe | 8826 | |
ae63b31e SR |
8827 | global_trace.flags = TRACE_ARRAY_FL_GLOBAL; |
8828 | ||
8829 | INIT_LIST_HEAD(&global_trace.systems); | |
8830 | INIT_LIST_HEAD(&global_trace.events); | |
067fe038 | 8831 | INIT_LIST_HEAD(&global_trace.hist_vars); |
ae63b31e SR |
8832 | list_add(&global_trace.list, &ftrace_trace_arrays); |
8833 | ||
a4d1e688 | 8834 | apply_trace_boot_options(); |
7bcfaf54 | 8835 | |
77fd5c15 SRRH |
8836 | register_snapshot_cmd(); |
8837 | ||
2fc1dfbe | 8838 | return 0; |
3f5a54e3 | 8839 | |
939c7a4f YY |
8840 | out_free_savedcmd: |
8841 | free_saved_cmdlines_buffer(savedcmd); | |
2c4a33ab SRRH |
8842 | out_free_temp_buffer: |
8843 | ring_buffer_free(temp_buffer); | |
b32614c0 SAS |
8844 | out_rm_hp_state: |
8845 | cpuhp_remove_multi_state(CPUHP_TRACE_RB_PREPARE); | |
9e01c1b7 | 8846 | out_free_cpumask: |
ccfe9e42 | 8847 | free_cpumask_var(global_trace.tracing_cpumask); |
9e01c1b7 RR |
8848 | out_free_buffer_mask: |
8849 | free_cpumask_var(tracing_buffer_mask); | |
8850 | out: | |
8851 | return ret; | |
bc0c38d1 | 8852 | } |
b2821ae6 | 8853 | |
e725c731 | 8854 | void __init early_trace_init(void) |
5f893b26 | 8855 | { |
0daa2302 SRRH |
8856 | if (tracepoint_printk) { |
8857 | tracepoint_print_iter = | |
8858 | kmalloc(sizeof(*tracepoint_print_iter), GFP_KERNEL); | |
8859 | if (WARN_ON(!tracepoint_print_iter)) | |
8860 | tracepoint_printk = 0; | |
42391745 SRRH |
8861 | else |
8862 | static_key_enable(&tracepoint_printk_key.key); | |
0daa2302 | 8863 | } |
5f893b26 | 8864 | tracer_alloc_buffers(); |
e725c731 SRV |
8865 | } |
8866 | ||
8867 | void __init trace_init(void) | |
8868 | { | |
0c564a53 | 8869 | trace_event_init(); |
5f893b26 SRRH |
8870 | } |
8871 | ||
b2821ae6 SR |
8872 | __init static int clear_boot_tracer(void) |
8873 | { | |
8874 | /* | |
8875 | * The default tracer at boot buffer is an init section. | |
8876 | * This function is called in lateinit. If we did not | |
8877 | * find the boot tracer, then clear it out, to prevent | |
8878 | * later registration from accessing the buffer that is | |
8879 | * about to be freed. | |
8880 | */ | |
8881 | if (!default_bootup_tracer) | |
8882 | return 0; | |
8883 | ||
8884 | printk(KERN_INFO "ftrace bootup tracer '%s' not registered.\n", | |
8885 | default_bootup_tracer); | |
8886 | default_bootup_tracer = NULL; | |
8887 | ||
8888 | return 0; | |
8889 | } | |
8890 | ||
8434dc93 | 8891 | fs_initcall(tracer_init_tracefs); |
4bb0f0e7 | 8892 | late_initcall_sync(clear_boot_tracer); |
3fd49c9e CW |
8893 | |
8894 | #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK | |
8895 | __init static int tracing_set_default_clock(void) | |
8896 | { | |
8897 | /* sched_clock_stable() is determined in late_initcall */ | |
5125eee4 | 8898 | if (!trace_boot_clock && !sched_clock_stable()) { |
3fd49c9e CW |
8899 | printk(KERN_WARNING |
8900 | "Unstable clock detected, switching default tracing clock to \"global\"\n" | |
8901 | "If you want to keep using the local clock, then add:\n" | |
8902 | " \"trace_clock=local\"\n" | |
8903 | "on the kernel command line\n"); | |
8904 | tracing_set_clock(&global_trace, "global"); | |
8905 | } | |
8906 | ||
8907 | return 0; | |
8908 | } | |
8909 | late_initcall_sync(tracing_set_default_clock); | |
8910 | #endif |