Commit | Line | Data |
---|---|---|
bc0c38d1 SR |
1 | /* |
2 | * ring buffer based function tracer | |
3 | * | |
2b6080f2 | 4 | * Copyright (C) 2007-2012 Steven Rostedt <srostedt@redhat.com> |
bc0c38d1 SR |
5 | * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> |
6 | * | |
7 | * Originally taken from the RT patch by: | |
8 | * Arnaldo Carvalho de Melo <acme@redhat.com> | |
9 | * | |
10 | * Based on code from the latency_tracer, that is: | |
11 | * Copyright (C) 2004-2006 Ingo Molnar | |
6d49e352 | 12 | * Copyright (C) 2004 Nadia Yvette Chambers |
bc0c38d1 | 13 | */ |
2cadf913 | 14 | #include <linux/ring_buffer.h> |
273b281f | 15 | #include <generated/utsrelease.h> |
2cadf913 SR |
16 | #include <linux/stacktrace.h> |
17 | #include <linux/writeback.h> | |
bc0c38d1 SR |
18 | #include <linux/kallsyms.h> |
19 | #include <linux/seq_file.h> | |
3f5a54e3 | 20 | #include <linux/notifier.h> |
2cadf913 | 21 | #include <linux/irqflags.h> |
bc0c38d1 | 22 | #include <linux/debugfs.h> |
4c11d7ae | 23 | #include <linux/pagemap.h> |
bc0c38d1 SR |
24 | #include <linux/hardirq.h> |
25 | #include <linux/linkage.h> | |
26 | #include <linux/uaccess.h> | |
2cadf913 | 27 | #include <linux/kprobes.h> |
bc0c38d1 SR |
28 | #include <linux/ftrace.h> |
29 | #include <linux/module.h> | |
30 | #include <linux/percpu.h> | |
2cadf913 | 31 | #include <linux/splice.h> |
3f5a54e3 | 32 | #include <linux/kdebug.h> |
5f0c6c03 | 33 | #include <linux/string.h> |
7e53bd42 | 34 | #include <linux/rwsem.h> |
5a0e3ad6 | 35 | #include <linux/slab.h> |
bc0c38d1 SR |
36 | #include <linux/ctype.h> |
37 | #include <linux/init.h> | |
2a2cc8f7 | 38 | #include <linux/poll.h> |
b892e5c8 | 39 | #include <linux/nmi.h> |
bc0c38d1 | 40 | #include <linux/fs.h> |
8bd75c77 | 41 | #include <linux/sched/rt.h> |
86387f7e | 42 | |
bc0c38d1 | 43 | #include "trace.h" |
f0868d1e | 44 | #include "trace_output.h" |
bc0c38d1 | 45 | |
73c5162a SR |
46 | /* |
47 | * On boot up, the ring buffer is set to the minimum size, so that | |
48 | * we do not waste memory on systems that are not using tracing. | |
49 | */ | |
55034cd6 | 50 | bool ring_buffer_expanded; |
73c5162a | 51 | |
8e1b82e0 FW |
52 | /* |
53 | * We need to change this state when a selftest is running. | |
ff32504f FW |
54 | * A selftest will lurk into the ring-buffer to count the |
55 | * entries inserted during the selftest although some concurrent | |
5e1607a0 | 56 | * insertions into the ring-buffer such as trace_printk could occurred |
ff32504f FW |
57 | * at the same time, giving false positive or negative results. |
58 | */ | |
8e1b82e0 | 59 | static bool __read_mostly tracing_selftest_running; |
ff32504f | 60 | |
b2821ae6 SR |
61 | /* |
62 | * If a tracer is running, we do not want to run SELFTEST. | |
63 | */ | |
020e5f85 | 64 | bool __read_mostly tracing_selftest_disabled; |
b2821ae6 | 65 | |
adf9f195 FW |
66 | /* For tracers that don't implement custom flags */ |
67 | static struct tracer_opt dummy_tracer_opt[] = { | |
68 | { } | |
69 | }; | |
70 | ||
71 | static struct tracer_flags dummy_tracer_flags = { | |
72 | .val = 0, | |
73 | .opts = dummy_tracer_opt | |
74 | }; | |
75 | ||
76 | static int dummy_set_flag(u32 old_flags, u32 bit, int set) | |
77 | { | |
78 | return 0; | |
79 | } | |
0f048701 | 80 | |
7ffbd48d SR |
81 | /* |
82 | * To prevent the comm cache from being overwritten when no | |
83 | * tracing is active, only save the comm when a trace event | |
84 | * occurred. | |
85 | */ | |
86 | static DEFINE_PER_CPU(bool, trace_cmdline_save); | |
87 | ||
0f048701 SR |
88 | /* |
89 | * Kill all tracing for good (never come back). | |
90 | * It is initialized to 1 but will turn to zero if the initialization | |
91 | * of the tracer is successful. But that is the only place that sets | |
92 | * this back to zero. | |
93 | */ | |
4fd27358 | 94 | static int tracing_disabled = 1; |
0f048701 | 95 | |
9288f99a | 96 | DEFINE_PER_CPU(int, ftrace_cpu_disabled); |
d769041f | 97 | |
955b61e5 | 98 | cpumask_var_t __read_mostly tracing_buffer_mask; |
ab46428c | 99 | |
944ac425 SR |
100 | /* |
101 | * ftrace_dump_on_oops - variable to dump ftrace buffer on oops | |
102 | * | |
103 | * If there is an oops (or kernel panic) and the ftrace_dump_on_oops | |
104 | * is set, then ftrace_dump is called. This will output the contents | |
105 | * of the ftrace buffers to the console. This is very useful for | |
106 | * capturing traces that lead to crashes and outputing it to a | |
107 | * serial console. | |
108 | * | |
109 | * It is default off, but you can enable it with either specifying | |
110 | * "ftrace_dump_on_oops" in the kernel command line, or setting | |
cecbca96 FW |
111 | * /proc/sys/kernel/ftrace_dump_on_oops |
112 | * Set 1 if you want to dump buffers of all CPUs | |
113 | * Set 2 if you want to dump the buffer of the CPU that triggered oops | |
944ac425 | 114 | */ |
cecbca96 FW |
115 | |
116 | enum ftrace_dump_mode ftrace_dump_on_oops; | |
944ac425 | 117 | |
b2821ae6 SR |
118 | static int tracing_set_tracer(const char *buf); |
119 | ||
ee6c2c1b LZ |
120 | #define MAX_TRACER_SIZE 100 |
121 | static char bootup_tracer_buf[MAX_TRACER_SIZE] __initdata; | |
b2821ae6 | 122 | static char *default_bootup_tracer; |
d9e54076 | 123 | |
55034cd6 SRRH |
124 | static bool allocate_snapshot; |
125 | ||
1beee96b | 126 | static int __init set_cmdline_ftrace(char *str) |
d9e54076 | 127 | { |
ee6c2c1b | 128 | strncpy(bootup_tracer_buf, str, MAX_TRACER_SIZE); |
b2821ae6 | 129 | default_bootup_tracer = bootup_tracer_buf; |
73c5162a | 130 | /* We are using ftrace early, expand it */ |
55034cd6 | 131 | ring_buffer_expanded = true; |
d9e54076 PZ |
132 | return 1; |
133 | } | |
1beee96b | 134 | __setup("ftrace=", set_cmdline_ftrace); |
d9e54076 | 135 | |
944ac425 SR |
136 | static int __init set_ftrace_dump_on_oops(char *str) |
137 | { | |
cecbca96 FW |
138 | if (*str++ != '=' || !*str) { |
139 | ftrace_dump_on_oops = DUMP_ALL; | |
140 | return 1; | |
141 | } | |
142 | ||
143 | if (!strcmp("orig_cpu", str)) { | |
144 | ftrace_dump_on_oops = DUMP_ORIG; | |
145 | return 1; | |
146 | } | |
147 | ||
148 | return 0; | |
944ac425 SR |
149 | } |
150 | __setup("ftrace_dump_on_oops", set_ftrace_dump_on_oops); | |
60a11774 | 151 | |
55034cd6 SRRH |
152 | static int __init alloc_snapshot(char *str) |
153 | { | |
154 | allocate_snapshot = true; | |
155 | /* We also need the main ring buffer expanded */ | |
156 | ring_buffer_expanded = true; | |
157 | return 1; | |
158 | } | |
159 | __setup("alloc_snapshot", alloc_snapshot); | |
160 | ||
7bcfaf54 SR |
161 | |
162 | static char trace_boot_options_buf[MAX_TRACER_SIZE] __initdata; | |
163 | static char *trace_boot_options __initdata; | |
164 | ||
165 | static int __init set_trace_boot_options(char *str) | |
166 | { | |
167 | strncpy(trace_boot_options_buf, str, MAX_TRACER_SIZE); | |
168 | trace_boot_options = trace_boot_options_buf; | |
169 | return 0; | |
170 | } | |
171 | __setup("trace_options=", set_trace_boot_options); | |
172 | ||
cf8e3474 | 173 | unsigned long long ns2usecs(cycle_t nsec) |
bc0c38d1 SR |
174 | { |
175 | nsec += 500; | |
176 | do_div(nsec, 1000); | |
177 | return nsec; | |
178 | } | |
179 | ||
4fcdae83 SR |
180 | /* |
181 | * The global_trace is the descriptor that holds the tracing | |
182 | * buffers for the live tracing. For each CPU, it contains | |
183 | * a link list of pages that will store trace entries. The | |
184 | * page descriptor of the pages in the memory is used to hold | |
185 | * the link list by linking the lru item in the page descriptor | |
186 | * to each of the pages in the buffer per CPU. | |
187 | * | |
188 | * For each active CPU there is a data field that holds the | |
189 | * pages for the buffer for that CPU. Each CPU has the same number | |
190 | * of pages allocated for its buffer. | |
191 | */ | |
bc0c38d1 SR |
192 | static struct trace_array global_trace; |
193 | ||
ae63b31e SR |
194 | LIST_HEAD(ftrace_trace_arrays); |
195 | ||
e77405ad SR |
196 | int filter_current_check_discard(struct ring_buffer *buffer, |
197 | struct ftrace_event_call *call, void *rec, | |
eb02ce01 TZ |
198 | struct ring_buffer_event *event) |
199 | { | |
e77405ad | 200 | return filter_check_discard(call, rec, buffer, event); |
eb02ce01 | 201 | } |
17c873ec | 202 | EXPORT_SYMBOL_GPL(filter_current_check_discard); |
eb02ce01 | 203 | |
37886f6a SR |
204 | cycle_t ftrace_now(int cpu) |
205 | { | |
206 | u64 ts; | |
207 | ||
208 | /* Early boot up does not have a buffer yet */ | |
12883efb | 209 | if (!global_trace.trace_buffer.buffer) |
37886f6a SR |
210 | return trace_clock_local(); |
211 | ||
12883efb SRRH |
212 | ts = ring_buffer_time_stamp(global_trace.trace_buffer.buffer, cpu); |
213 | ring_buffer_normalize_time_stamp(global_trace.trace_buffer.buffer, cpu, &ts); | |
37886f6a SR |
214 | |
215 | return ts; | |
216 | } | |
bc0c38d1 | 217 | |
9036990d SR |
218 | int tracing_is_enabled(void) |
219 | { | |
0fb9656d | 220 | return tracing_is_on(); |
9036990d SR |
221 | } |
222 | ||
4fcdae83 | 223 | /* |
3928a8a2 SR |
224 | * trace_buf_size is the size in bytes that is allocated |
225 | * for a buffer. Note, the number of bytes is always rounded | |
226 | * to page size. | |
3f5a54e3 SR |
227 | * |
228 | * This number is purposely set to a low number of 16384. | |
229 | * If the dump on oops happens, it will be much appreciated | |
230 | * to not have to wait for all that output. Anyway this can be | |
231 | * boot time and run time configurable. | |
4fcdae83 | 232 | */ |
3928a8a2 | 233 | #define TRACE_BUF_SIZE_DEFAULT 1441792UL /* 16384 * 88 (sizeof(entry)) */ |
3f5a54e3 | 234 | |
3928a8a2 | 235 | static unsigned long trace_buf_size = TRACE_BUF_SIZE_DEFAULT; |
bc0c38d1 | 236 | |
4fcdae83 | 237 | /* trace_types holds a link list of available tracers. */ |
bc0c38d1 | 238 | static struct tracer *trace_types __read_mostly; |
4fcdae83 | 239 | |
4fcdae83 SR |
240 | /* |
241 | * trace_types_lock is used to protect the trace_types list. | |
4fcdae83 | 242 | */ |
bc0c38d1 | 243 | static DEFINE_MUTEX(trace_types_lock); |
4fcdae83 | 244 | |
7e53bd42 LJ |
245 | /* |
246 | * serialize the access of the ring buffer | |
247 | * | |
248 | * ring buffer serializes readers, but it is low level protection. | |
249 | * The validity of the events (which returns by ring_buffer_peek() ..etc) | |
250 | * are not protected by ring buffer. | |
251 | * | |
252 | * The content of events may become garbage if we allow other process consumes | |
253 | * these events concurrently: | |
254 | * A) the page of the consumed events may become a normal page | |
255 | * (not reader page) in ring buffer, and this page will be rewrited | |
256 | * by events producer. | |
257 | * B) The page of the consumed events may become a page for splice_read, | |
258 | * and this page will be returned to system. | |
259 | * | |
260 | * These primitives allow multi process access to different cpu ring buffer | |
261 | * concurrently. | |
262 | * | |
263 | * These primitives don't distinguish read-only and read-consume access. | |
264 | * Multi read-only access are also serialized. | |
265 | */ | |
266 | ||
267 | #ifdef CONFIG_SMP | |
268 | static DECLARE_RWSEM(all_cpu_access_lock); | |
269 | static DEFINE_PER_CPU(struct mutex, cpu_access_lock); | |
270 | ||
271 | static inline void trace_access_lock(int cpu) | |
272 | { | |
ae3b5093 | 273 | if (cpu == RING_BUFFER_ALL_CPUS) { |
7e53bd42 LJ |
274 | /* gain it for accessing the whole ring buffer. */ |
275 | down_write(&all_cpu_access_lock); | |
276 | } else { | |
277 | /* gain it for accessing a cpu ring buffer. */ | |
278 | ||
ae3b5093 | 279 | /* Firstly block other trace_access_lock(RING_BUFFER_ALL_CPUS). */ |
7e53bd42 LJ |
280 | down_read(&all_cpu_access_lock); |
281 | ||
282 | /* Secondly block other access to this @cpu ring buffer. */ | |
283 | mutex_lock(&per_cpu(cpu_access_lock, cpu)); | |
284 | } | |
285 | } | |
286 | ||
287 | static inline void trace_access_unlock(int cpu) | |
288 | { | |
ae3b5093 | 289 | if (cpu == RING_BUFFER_ALL_CPUS) { |
7e53bd42 LJ |
290 | up_write(&all_cpu_access_lock); |
291 | } else { | |
292 | mutex_unlock(&per_cpu(cpu_access_lock, cpu)); | |
293 | up_read(&all_cpu_access_lock); | |
294 | } | |
295 | } | |
296 | ||
297 | static inline void trace_access_lock_init(void) | |
298 | { | |
299 | int cpu; | |
300 | ||
301 | for_each_possible_cpu(cpu) | |
302 | mutex_init(&per_cpu(cpu_access_lock, cpu)); | |
303 | } | |
304 | ||
305 | #else | |
306 | ||
307 | static DEFINE_MUTEX(access_lock); | |
308 | ||
309 | static inline void trace_access_lock(int cpu) | |
310 | { | |
311 | (void)cpu; | |
312 | mutex_lock(&access_lock); | |
313 | } | |
314 | ||
315 | static inline void trace_access_unlock(int cpu) | |
316 | { | |
317 | (void)cpu; | |
318 | mutex_unlock(&access_lock); | |
319 | } | |
320 | ||
321 | static inline void trace_access_lock_init(void) | |
322 | { | |
323 | } | |
324 | ||
325 | #endif | |
326 | ||
ee6bce52 | 327 | /* trace_flags holds trace_options default values */ |
12ef7d44 | 328 | unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK | |
a2a16d6a | 329 | TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO | TRACE_ITER_SLEEP_TIME | |
77271ce4 | 330 | TRACE_ITER_GRAPH_TIME | TRACE_ITER_RECORD_CMD | TRACE_ITER_OVERWRITE | |
5224c3a3 | 331 | TRACE_ITER_IRQ_INFO | TRACE_ITER_MARKERS; |
4e655519 | 332 | |
499e5470 SR |
333 | /** |
334 | * tracing_on - enable tracing buffers | |
335 | * | |
336 | * This function enables tracing buffers that may have been | |
337 | * disabled with tracing_off. | |
338 | */ | |
339 | void tracing_on(void) | |
340 | { | |
12883efb SRRH |
341 | if (global_trace.trace_buffer.buffer) |
342 | ring_buffer_record_on(global_trace.trace_buffer.buffer); | |
499e5470 SR |
343 | /* |
344 | * This flag is only looked at when buffers haven't been | |
345 | * allocated yet. We don't really care about the race | |
346 | * between setting this flag and actually turning | |
347 | * on the buffer. | |
348 | */ | |
349 | global_trace.buffer_disabled = 0; | |
350 | } | |
351 | EXPORT_SYMBOL_GPL(tracing_on); | |
352 | ||
ad909e21 SRRH |
353 | #ifdef CONFIG_TRACER_SNAPSHOT |
354 | /** | |
355 | * trace_snapshot - take a snapshot of the current buffer. | |
356 | * | |
357 | * This causes a swap between the snapshot buffer and the current live | |
358 | * tracing buffer. You can use this to take snapshots of the live | |
359 | * trace when some condition is triggered, but continue to trace. | |
360 | * | |
361 | * Note, make sure to allocate the snapshot with either | |
362 | * a tracing_snapshot_alloc(), or by doing it manually | |
363 | * with: echo 1 > /sys/kernel/debug/tracing/snapshot | |
364 | * | |
365 | * If the snapshot buffer is not allocated, it will stop tracing. | |
366 | * Basically making a permanent snapshot. | |
367 | */ | |
368 | void tracing_snapshot(void) | |
369 | { | |
370 | struct trace_array *tr = &global_trace; | |
371 | struct tracer *tracer = tr->current_trace; | |
372 | unsigned long flags; | |
373 | ||
374 | if (!tr->allocated_snapshot) { | |
375 | trace_printk("*** SNAPSHOT NOT ALLOCATED ***\n"); | |
376 | trace_printk("*** stopping trace here! ***\n"); | |
377 | tracing_off(); | |
378 | return; | |
379 | } | |
380 | ||
381 | /* Note, snapshot can not be used when the tracer uses it */ | |
382 | if (tracer->use_max_tr) { | |
383 | trace_printk("*** LATENCY TRACER ACTIVE ***\n"); | |
384 | trace_printk("*** Can not use snapshot (sorry) ***\n"); | |
385 | return; | |
386 | } | |
387 | ||
388 | local_irq_save(flags); | |
389 | update_max_tr(tr, current, smp_processor_id()); | |
390 | local_irq_restore(flags); | |
391 | } | |
392 | ||
393 | static int resize_buffer_duplicate_size(struct trace_buffer *trace_buf, | |
394 | struct trace_buffer *size_buf, int cpu_id); | |
395 | ||
396 | /** | |
397 | * trace_snapshot_alloc - allocate and take a snapshot of the current buffer. | |
398 | * | |
399 | * This is similar to trace_snapshot(), but it will allocate the | |
400 | * snapshot buffer if it isn't already allocated. Use this only | |
401 | * where it is safe to sleep, as the allocation may sleep. | |
402 | * | |
403 | * This causes a swap between the snapshot buffer and the current live | |
404 | * tracing buffer. You can use this to take snapshots of the live | |
405 | * trace when some condition is triggered, but continue to trace. | |
406 | */ | |
407 | void tracing_snapshot_alloc(void) | |
408 | { | |
409 | struct trace_array *tr = &global_trace; | |
410 | int ret; | |
411 | ||
412 | if (!tr->allocated_snapshot) { | |
413 | ||
414 | /* allocate spare buffer */ | |
415 | ret = resize_buffer_duplicate_size(&tr->max_buffer, | |
416 | &tr->trace_buffer, RING_BUFFER_ALL_CPUS); | |
417 | if (WARN_ON(ret < 0)) | |
418 | return; | |
419 | ||
420 | tr->allocated_snapshot = true; | |
421 | } | |
422 | ||
423 | tracing_snapshot(); | |
424 | } | |
425 | #else | |
426 | void tracing_snapshot(void) | |
427 | { | |
428 | WARN_ONCE(1, "Snapshot feature not enabled, but internal snapshot used"); | |
429 | } | |
430 | void tracing_snapshot_alloc(void) | |
431 | { | |
432 | /* Give warning */ | |
433 | tracing_snapshot(); | |
434 | } | |
435 | #endif /* CONFIG_TRACER_SNAPSHOT */ | |
436 | ||
499e5470 SR |
437 | /** |
438 | * tracing_off - turn off tracing buffers | |
439 | * | |
440 | * This function stops the tracing buffers from recording data. | |
441 | * It does not disable any overhead the tracers themselves may | |
442 | * be causing. This function simply causes all recording to | |
443 | * the ring buffers to fail. | |
444 | */ | |
445 | void tracing_off(void) | |
446 | { | |
12883efb SRRH |
447 | if (global_trace.trace_buffer.buffer) |
448 | ring_buffer_record_off(global_trace.trace_buffer.buffer); | |
499e5470 SR |
449 | /* |
450 | * This flag is only looked at when buffers haven't been | |
451 | * allocated yet. We don't really care about the race | |
452 | * between setting this flag and actually turning | |
453 | * on the buffer. | |
454 | */ | |
455 | global_trace.buffer_disabled = 1; | |
456 | } | |
457 | EXPORT_SYMBOL_GPL(tracing_off); | |
458 | ||
459 | /** | |
460 | * tracing_is_on - show state of ring buffers enabled | |
461 | */ | |
462 | int tracing_is_on(void) | |
463 | { | |
12883efb SRRH |
464 | if (global_trace.trace_buffer.buffer) |
465 | return ring_buffer_record_is_on(global_trace.trace_buffer.buffer); | |
499e5470 SR |
466 | return !global_trace.buffer_disabled; |
467 | } | |
468 | EXPORT_SYMBOL_GPL(tracing_is_on); | |
469 | ||
3928a8a2 | 470 | static int __init set_buf_size(char *str) |
bc0c38d1 | 471 | { |
3928a8a2 | 472 | unsigned long buf_size; |
c6caeeb1 | 473 | |
bc0c38d1 SR |
474 | if (!str) |
475 | return 0; | |
9d612bef | 476 | buf_size = memparse(str, &str); |
c6caeeb1 | 477 | /* nr_entries can not be zero */ |
9d612bef | 478 | if (buf_size == 0) |
c6caeeb1 | 479 | return 0; |
3928a8a2 | 480 | trace_buf_size = buf_size; |
bc0c38d1 SR |
481 | return 1; |
482 | } | |
3928a8a2 | 483 | __setup("trace_buf_size=", set_buf_size); |
bc0c38d1 | 484 | |
0e950173 TB |
485 | static int __init set_tracing_thresh(char *str) |
486 | { | |
87abb3b1 | 487 | unsigned long threshold; |
0e950173 TB |
488 | int ret; |
489 | ||
490 | if (!str) | |
491 | return 0; | |
bcd83ea6 | 492 | ret = kstrtoul(str, 0, &threshold); |
0e950173 TB |
493 | if (ret < 0) |
494 | return 0; | |
87abb3b1 | 495 | tracing_thresh = threshold * 1000; |
0e950173 TB |
496 | return 1; |
497 | } | |
498 | __setup("tracing_thresh=", set_tracing_thresh); | |
499 | ||
57f50be1 SR |
500 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
501 | { | |
502 | return nsecs / 1000; | |
503 | } | |
504 | ||
4fcdae83 | 505 | /* These must match the bit postions in trace_iterator_flags */ |
bc0c38d1 SR |
506 | static const char *trace_options[] = { |
507 | "print-parent", | |
508 | "sym-offset", | |
509 | "sym-addr", | |
510 | "verbose", | |
f9896bf3 | 511 | "raw", |
5e3ca0ec | 512 | "hex", |
cb0f12aa | 513 | "bin", |
2a2cc8f7 | 514 | "block", |
86387f7e | 515 | "stacktrace", |
5e1607a0 | 516 | "trace_printk", |
b2a866f9 | 517 | "ftrace_preempt", |
9f029e83 | 518 | "branch", |
12ef7d44 | 519 | "annotate", |
02b67518 | 520 | "userstacktrace", |
b54d3de9 | 521 | "sym-userobj", |
66896a85 | 522 | "printk-msg-only", |
c4a8e8be | 523 | "context-info", |
c032ef64 | 524 | "latency-format", |
be6f164a | 525 | "sleep-time", |
a2a16d6a | 526 | "graph-time", |
e870e9a1 | 527 | "record-cmd", |
750912fa | 528 | "overwrite", |
cf30cf67 | 529 | "disable_on_free", |
77271ce4 | 530 | "irq-info", |
5224c3a3 | 531 | "markers", |
bc0c38d1 SR |
532 | NULL |
533 | }; | |
534 | ||
5079f326 Z |
535 | static struct { |
536 | u64 (*func)(void); | |
537 | const char *name; | |
8be0709f | 538 | int in_ns; /* is this clock in nanoseconds? */ |
5079f326 | 539 | } trace_clocks[] = { |
8be0709f DS |
540 | { trace_clock_local, "local", 1 }, |
541 | { trace_clock_global, "global", 1 }, | |
542 | { trace_clock_counter, "counter", 0 }, | |
8cbd9cc6 | 543 | ARCH_TRACE_CLOCKS |
5079f326 Z |
544 | }; |
545 | ||
546 | int trace_clock_id; | |
547 | ||
b63f39ea | 548 | /* |
549 | * trace_parser_get_init - gets the buffer for trace parser | |
550 | */ | |
551 | int trace_parser_get_init(struct trace_parser *parser, int size) | |
552 | { | |
553 | memset(parser, 0, sizeof(*parser)); | |
554 | ||
555 | parser->buffer = kmalloc(size, GFP_KERNEL); | |
556 | if (!parser->buffer) | |
557 | return 1; | |
558 | ||
559 | parser->size = size; | |
560 | return 0; | |
561 | } | |
562 | ||
563 | /* | |
564 | * trace_parser_put - frees the buffer for trace parser | |
565 | */ | |
566 | void trace_parser_put(struct trace_parser *parser) | |
567 | { | |
568 | kfree(parser->buffer); | |
569 | } | |
570 | ||
571 | /* | |
572 | * trace_get_user - reads the user input string separated by space | |
573 | * (matched by isspace(ch)) | |
574 | * | |
575 | * For each string found the 'struct trace_parser' is updated, | |
576 | * and the function returns. | |
577 | * | |
578 | * Returns number of bytes read. | |
579 | * | |
580 | * See kernel/trace/trace.h for 'struct trace_parser' details. | |
581 | */ | |
582 | int trace_get_user(struct trace_parser *parser, const char __user *ubuf, | |
583 | size_t cnt, loff_t *ppos) | |
584 | { | |
585 | char ch; | |
586 | size_t read = 0; | |
587 | ssize_t ret; | |
588 | ||
589 | if (!*ppos) | |
590 | trace_parser_clear(parser); | |
591 | ||
592 | ret = get_user(ch, ubuf++); | |
593 | if (ret) | |
594 | goto out; | |
595 | ||
596 | read++; | |
597 | cnt--; | |
598 | ||
599 | /* | |
600 | * The parser is not finished with the last write, | |
601 | * continue reading the user input without skipping spaces. | |
602 | */ | |
603 | if (!parser->cont) { | |
604 | /* skip white space */ | |
605 | while (cnt && isspace(ch)) { | |
606 | ret = get_user(ch, ubuf++); | |
607 | if (ret) | |
608 | goto out; | |
609 | read++; | |
610 | cnt--; | |
611 | } | |
612 | ||
613 | /* only spaces were written */ | |
614 | if (isspace(ch)) { | |
615 | *ppos += read; | |
616 | ret = read; | |
617 | goto out; | |
618 | } | |
619 | ||
620 | parser->idx = 0; | |
621 | } | |
622 | ||
623 | /* read the non-space input */ | |
624 | while (cnt && !isspace(ch)) { | |
3c235a33 | 625 | if (parser->idx < parser->size - 1) |
b63f39ea | 626 | parser->buffer[parser->idx++] = ch; |
627 | else { | |
628 | ret = -EINVAL; | |
629 | goto out; | |
630 | } | |
631 | ret = get_user(ch, ubuf++); | |
632 | if (ret) | |
633 | goto out; | |
634 | read++; | |
635 | cnt--; | |
636 | } | |
637 | ||
638 | /* We either got finished input or we have to wait for another call. */ | |
639 | if (isspace(ch)) { | |
640 | parser->buffer[parser->idx] = 0; | |
641 | parser->cont = false; | |
642 | } else { | |
643 | parser->cont = true; | |
644 | parser->buffer[parser->idx++] = ch; | |
645 | } | |
646 | ||
647 | *ppos += read; | |
648 | ret = read; | |
649 | ||
650 | out: | |
651 | return ret; | |
652 | } | |
653 | ||
6c6c2796 PP |
654 | ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt) |
655 | { | |
656 | int len; | |
657 | int ret; | |
658 | ||
2dc5d12b SR |
659 | if (!cnt) |
660 | return 0; | |
661 | ||
6c6c2796 PP |
662 | if (s->len <= s->readpos) |
663 | return -EBUSY; | |
664 | ||
665 | len = s->len - s->readpos; | |
666 | if (cnt > len) | |
667 | cnt = len; | |
668 | ret = copy_to_user(ubuf, s->buffer + s->readpos, cnt); | |
2dc5d12b | 669 | if (ret == cnt) |
6c6c2796 PP |
670 | return -EFAULT; |
671 | ||
2dc5d12b SR |
672 | cnt -= ret; |
673 | ||
e74da523 | 674 | s->readpos += cnt; |
6c6c2796 | 675 | return cnt; |
214023c3 SR |
676 | } |
677 | ||
b8b94265 | 678 | static ssize_t trace_seq_to_buffer(struct trace_seq *s, void *buf, size_t cnt) |
3c56819b EGM |
679 | { |
680 | int len; | |
3c56819b EGM |
681 | |
682 | if (s->len <= s->readpos) | |
683 | return -EBUSY; | |
684 | ||
685 | len = s->len - s->readpos; | |
686 | if (cnt > len) | |
687 | cnt = len; | |
5a26c8f0 | 688 | memcpy(buf, s->buffer + s->readpos, cnt); |
3c56819b | 689 | |
e74da523 | 690 | s->readpos += cnt; |
3c56819b EGM |
691 | return cnt; |
692 | } | |
693 | ||
5d4a9dba SR |
694 | /* |
695 | * ftrace_max_lock is used to protect the swapping of buffers | |
696 | * when taking a max snapshot. The buffers themselves are | |
697 | * protected by per_cpu spinlocks. But the action of the swap | |
698 | * needs its own lock. | |
699 | * | |
445c8951 | 700 | * This is defined as a arch_spinlock_t in order to help |
5d4a9dba SR |
701 | * with performance when lockdep debugging is enabled. |
702 | * | |
703 | * It is also used in other places outside the update_max_tr | |
704 | * so it needs to be defined outside of the | |
705 | * CONFIG_TRACER_MAX_TRACE. | |
706 | */ | |
445c8951 | 707 | static arch_spinlock_t ftrace_max_lock = |
edc35bd7 | 708 | (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED; |
5d4a9dba | 709 | |
0e950173 TB |
710 | unsigned long __read_mostly tracing_thresh; |
711 | ||
5d4a9dba SR |
712 | #ifdef CONFIG_TRACER_MAX_TRACE |
713 | unsigned long __read_mostly tracing_max_latency; | |
5d4a9dba SR |
714 | |
715 | /* | |
716 | * Copy the new maximum trace into the separate maximum-trace | |
717 | * structure. (this way the maximum trace is permanently saved, | |
718 | * for later retrieval via /sys/kernel/debug/tracing/latency_trace) | |
719 | */ | |
720 | static void | |
721 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) | |
722 | { | |
12883efb SRRH |
723 | struct trace_buffer *trace_buf = &tr->trace_buffer; |
724 | struct trace_buffer *max_buf = &tr->max_buffer; | |
725 | struct trace_array_cpu *data = per_cpu_ptr(trace_buf->data, cpu); | |
726 | struct trace_array_cpu *max_data = per_cpu_ptr(max_buf->data, cpu); | |
5d4a9dba | 727 | |
12883efb SRRH |
728 | max_buf->cpu = cpu; |
729 | max_buf->time_start = data->preempt_timestamp; | |
5d4a9dba | 730 | |
8248ac05 SR |
731 | max_data->saved_latency = tracing_max_latency; |
732 | max_data->critical_start = data->critical_start; | |
733 | max_data->critical_end = data->critical_end; | |
5d4a9dba | 734 | |
1acaa1b2 | 735 | memcpy(max_data->comm, tsk->comm, TASK_COMM_LEN); |
8248ac05 SR |
736 | max_data->pid = tsk->pid; |
737 | max_data->uid = task_uid(tsk); | |
738 | max_data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; | |
739 | max_data->policy = tsk->policy; | |
740 | max_data->rt_priority = tsk->rt_priority; | |
5d4a9dba SR |
741 | |
742 | /* record this tasks comm */ | |
743 | tracing_record_cmdline(tsk); | |
744 | } | |
745 | ||
4fcdae83 SR |
746 | /** |
747 | * update_max_tr - snapshot all trace buffers from global_trace to max_tr | |
748 | * @tr: tracer | |
749 | * @tsk: the task with the latency | |
750 | * @cpu: The cpu that initiated the trace. | |
751 | * | |
752 | * Flip the buffers between the @tr and the max_tr and record information | |
753 | * about which task was the cause of this latency. | |
754 | */ | |
e309b41d | 755 | void |
bc0c38d1 SR |
756 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
757 | { | |
2721e72d | 758 | struct ring_buffer *buf; |
bc0c38d1 | 759 | |
2b6080f2 | 760 | if (tr->stop_count) |
b8de7bd1 SR |
761 | return; |
762 | ||
4c11d7ae | 763 | WARN_ON_ONCE(!irqs_disabled()); |
34600f0e | 764 | |
45ad21ca | 765 | if (!tr->allocated_snapshot) { |
debdd57f | 766 | /* Only the nop tracer should hit this when disabling */ |
2b6080f2 | 767 | WARN_ON_ONCE(tr->current_trace != &nop_trace); |
34600f0e | 768 | return; |
debdd57f | 769 | } |
34600f0e | 770 | |
0199c4e6 | 771 | arch_spin_lock(&ftrace_max_lock); |
3928a8a2 | 772 | |
12883efb SRRH |
773 | buf = tr->trace_buffer.buffer; |
774 | tr->trace_buffer.buffer = tr->max_buffer.buffer; | |
775 | tr->max_buffer.buffer = buf; | |
3928a8a2 | 776 | |
bc0c38d1 | 777 | __update_max_tr(tr, tsk, cpu); |
0199c4e6 | 778 | arch_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
779 | } |
780 | ||
781 | /** | |
782 | * update_max_tr_single - only copy one trace over, and reset the rest | |
783 | * @tr - tracer | |
784 | * @tsk - task with the latency | |
785 | * @cpu - the cpu of the buffer to copy. | |
4fcdae83 SR |
786 | * |
787 | * Flip the trace of a single CPU buffer between the @tr and the max_tr. | |
bc0c38d1 | 788 | */ |
e309b41d | 789 | void |
bc0c38d1 SR |
790 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
791 | { | |
3928a8a2 | 792 | int ret; |
bc0c38d1 | 793 | |
2b6080f2 | 794 | if (tr->stop_count) |
b8de7bd1 SR |
795 | return; |
796 | ||
4c11d7ae | 797 | WARN_ON_ONCE(!irqs_disabled()); |
45ad21ca | 798 | if (WARN_ON_ONCE(!tr->allocated_snapshot)) |
ef710e10 | 799 | return; |
ef710e10 | 800 | |
0199c4e6 | 801 | arch_spin_lock(&ftrace_max_lock); |
bc0c38d1 | 802 | |
12883efb | 803 | ret = ring_buffer_swap_cpu(tr->max_buffer.buffer, tr->trace_buffer.buffer, cpu); |
3928a8a2 | 804 | |
e8165dbb SR |
805 | if (ret == -EBUSY) { |
806 | /* | |
807 | * We failed to swap the buffer due to a commit taking | |
808 | * place on this CPU. We fail to record, but we reset | |
809 | * the max trace buffer (no one writes directly to it) | |
810 | * and flag that it failed. | |
811 | */ | |
12883efb | 812 | trace_array_printk_buf(tr->max_buffer.buffer, _THIS_IP_, |
e8165dbb SR |
813 | "Failed to swap buffers due to commit in progress\n"); |
814 | } | |
815 | ||
e8165dbb | 816 | WARN_ON_ONCE(ret && ret != -EAGAIN && ret != -EBUSY); |
bc0c38d1 SR |
817 | |
818 | __update_max_tr(tr, tsk, cpu); | |
0199c4e6 | 819 | arch_spin_unlock(&ftrace_max_lock); |
bc0c38d1 | 820 | } |
5d4a9dba | 821 | #endif /* CONFIG_TRACER_MAX_TRACE */ |
bc0c38d1 | 822 | |
0d5c6e1c SR |
823 | static void default_wait_pipe(struct trace_iterator *iter) |
824 | { | |
15693458 SRRH |
825 | /* Iterators are static, they should be filled or empty */ |
826 | if (trace_buffer_iter(iter, iter->cpu_file)) | |
827 | return; | |
0d5c6e1c | 828 | |
12883efb | 829 | ring_buffer_wait(iter->trace_buffer->buffer, iter->cpu_file); |
0d5c6e1c SR |
830 | } |
831 | ||
f4e781c0 SRRH |
832 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
833 | static int run_tracer_selftest(struct tracer *type) | |
834 | { | |
835 | struct trace_array *tr = &global_trace; | |
836 | struct tracer *saved_tracer = tr->current_trace; | |
837 | int ret; | |
838 | ||
839 | if (!type->selftest || tracing_selftest_disabled) | |
840 | return 0; | |
841 | ||
842 | /* | |
843 | * Run a selftest on this tracer. | |
844 | * Here we reset the trace buffer, and set the current | |
845 | * tracer to be this tracer. The tracer can then run some | |
846 | * internal tracing to verify that everything is in order. | |
847 | * If we fail, we do not register this tracer. | |
848 | */ | |
849 | tracing_reset_online_cpus(&tr->trace_buffer); | |
850 | ||
851 | tr->current_trace = type; | |
852 | ||
853 | #ifdef CONFIG_TRACER_MAX_TRACE | |
854 | if (type->use_max_tr) { | |
855 | /* If we expanded the buffers, make sure the max is expanded too */ | |
856 | if (ring_buffer_expanded) | |
857 | ring_buffer_resize(tr->max_buffer.buffer, trace_buf_size, | |
858 | RING_BUFFER_ALL_CPUS); | |
859 | tr->allocated_snapshot = true; | |
860 | } | |
861 | #endif | |
862 | ||
863 | /* the test is responsible for initializing and enabling */ | |
864 | pr_info("Testing tracer %s: ", type->name); | |
865 | ret = type->selftest(type, tr); | |
866 | /* the test is responsible for resetting too */ | |
867 | tr->current_trace = saved_tracer; | |
868 | if (ret) { | |
869 | printk(KERN_CONT "FAILED!\n"); | |
870 | /* Add the warning after printing 'FAILED' */ | |
871 | WARN_ON(1); | |
872 | return -1; | |
873 | } | |
874 | /* Only reset on passing, to avoid touching corrupted buffers */ | |
875 | tracing_reset_online_cpus(&tr->trace_buffer); | |
876 | ||
877 | #ifdef CONFIG_TRACER_MAX_TRACE | |
878 | if (type->use_max_tr) { | |
879 | tr->allocated_snapshot = false; | |
880 | ||
881 | /* Shrink the max buffer again */ | |
882 | if (ring_buffer_expanded) | |
883 | ring_buffer_resize(tr->max_buffer.buffer, 1, | |
884 | RING_BUFFER_ALL_CPUS); | |
885 | } | |
886 | #endif | |
887 | ||
888 | printk(KERN_CONT "PASSED\n"); | |
889 | return 0; | |
890 | } | |
891 | #else | |
892 | static inline int run_tracer_selftest(struct tracer *type) | |
893 | { | |
894 | return 0; | |
895 | } | |
896 | #endif /* CONFIG_FTRACE_STARTUP_TEST */ | |
897 | ||
4fcdae83 SR |
898 | /** |
899 | * register_tracer - register a tracer with the ftrace system. | |
900 | * @type - the plugin for the tracer | |
901 | * | |
902 | * Register a new plugin tracer. | |
903 | */ | |
bc0c38d1 SR |
904 | int register_tracer(struct tracer *type) |
905 | { | |
906 | struct tracer *t; | |
bc0c38d1 SR |
907 | int ret = 0; |
908 | ||
909 | if (!type->name) { | |
910 | pr_info("Tracer must have a name\n"); | |
911 | return -1; | |
912 | } | |
913 | ||
24a461d5 | 914 | if (strlen(type->name) >= MAX_TRACER_SIZE) { |
ee6c2c1b LZ |
915 | pr_info("Tracer has a name longer than %d\n", MAX_TRACER_SIZE); |
916 | return -1; | |
917 | } | |
918 | ||
bc0c38d1 | 919 | mutex_lock(&trace_types_lock); |
86fa2f60 | 920 | |
8e1b82e0 FW |
921 | tracing_selftest_running = true; |
922 | ||
bc0c38d1 SR |
923 | for (t = trace_types; t; t = t->next) { |
924 | if (strcmp(type->name, t->name) == 0) { | |
925 | /* already found */ | |
ee6c2c1b | 926 | pr_info("Tracer %s already registered\n", |
bc0c38d1 SR |
927 | type->name); |
928 | ret = -1; | |
929 | goto out; | |
930 | } | |
931 | } | |
932 | ||
adf9f195 FW |
933 | if (!type->set_flag) |
934 | type->set_flag = &dummy_set_flag; | |
935 | if (!type->flags) | |
936 | type->flags = &dummy_tracer_flags; | |
937 | else | |
938 | if (!type->flags->opts) | |
939 | type->flags->opts = dummy_tracer_opt; | |
6eaaa5d5 FW |
940 | if (!type->wait_pipe) |
941 | type->wait_pipe = default_wait_pipe; | |
942 | ||
f4e781c0 SRRH |
943 | ret = run_tracer_selftest(type); |
944 | if (ret < 0) | |
945 | goto out; | |
60a11774 | 946 | |
bc0c38d1 SR |
947 | type->next = trace_types; |
948 | trace_types = type; | |
60a11774 | 949 | |
bc0c38d1 | 950 | out: |
8e1b82e0 | 951 | tracing_selftest_running = false; |
bc0c38d1 SR |
952 | mutex_unlock(&trace_types_lock); |
953 | ||
dac74940 SR |
954 | if (ret || !default_bootup_tracer) |
955 | goto out_unlock; | |
956 | ||
ee6c2c1b | 957 | if (strncmp(default_bootup_tracer, type->name, MAX_TRACER_SIZE)) |
dac74940 SR |
958 | goto out_unlock; |
959 | ||
960 | printk(KERN_INFO "Starting tracer '%s'\n", type->name); | |
961 | /* Do we want this tracer to start on bootup? */ | |
962 | tracing_set_tracer(type->name); | |
963 | default_bootup_tracer = NULL; | |
964 | /* disable other selftests, since this will break it. */ | |
55034cd6 | 965 | tracing_selftest_disabled = true; |
b2821ae6 | 966 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
dac74940 SR |
967 | printk(KERN_INFO "Disabling FTRACE selftests due to running tracer '%s'\n", |
968 | type->name); | |
b2821ae6 | 969 | #endif |
b2821ae6 | 970 | |
dac74940 | 971 | out_unlock: |
bc0c38d1 SR |
972 | return ret; |
973 | } | |
974 | ||
12883efb | 975 | void tracing_reset(struct trace_buffer *buf, int cpu) |
f633903a | 976 | { |
12883efb | 977 | struct ring_buffer *buffer = buf->buffer; |
f633903a | 978 | |
a5416411 HT |
979 | if (!buffer) |
980 | return; | |
981 | ||
f633903a SR |
982 | ring_buffer_record_disable(buffer); |
983 | ||
984 | /* Make sure all commits have finished */ | |
985 | synchronize_sched(); | |
68179686 | 986 | ring_buffer_reset_cpu(buffer, cpu); |
f633903a SR |
987 | |
988 | ring_buffer_record_enable(buffer); | |
989 | } | |
990 | ||
12883efb | 991 | void tracing_reset_online_cpus(struct trace_buffer *buf) |
213cc060 | 992 | { |
12883efb | 993 | struct ring_buffer *buffer = buf->buffer; |
213cc060 PE |
994 | int cpu; |
995 | ||
a5416411 HT |
996 | if (!buffer) |
997 | return; | |
998 | ||
621968cd SR |
999 | ring_buffer_record_disable(buffer); |
1000 | ||
1001 | /* Make sure all commits have finished */ | |
1002 | synchronize_sched(); | |
1003 | ||
12883efb | 1004 | buf->time_start = ftrace_now(buf->cpu); |
213cc060 PE |
1005 | |
1006 | for_each_online_cpu(cpu) | |
68179686 | 1007 | ring_buffer_reset_cpu(buffer, cpu); |
621968cd SR |
1008 | |
1009 | ring_buffer_record_enable(buffer); | |
213cc060 PE |
1010 | } |
1011 | ||
9456f0fa SR |
1012 | void tracing_reset_current(int cpu) |
1013 | { | |
12883efb | 1014 | tracing_reset(&global_trace.trace_buffer, cpu); |
9456f0fa SR |
1015 | } |
1016 | ||
873c642f | 1017 | void tracing_reset_all_online_cpus(void) |
9456f0fa | 1018 | { |
873c642f SRRH |
1019 | struct trace_array *tr; |
1020 | ||
1021 | mutex_lock(&trace_types_lock); | |
1022 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
12883efb SRRH |
1023 | tracing_reset_online_cpus(&tr->trace_buffer); |
1024 | #ifdef CONFIG_TRACER_MAX_TRACE | |
1025 | tracing_reset_online_cpus(&tr->max_buffer); | |
1026 | #endif | |
873c642f SRRH |
1027 | } |
1028 | mutex_unlock(&trace_types_lock); | |
9456f0fa SR |
1029 | } |
1030 | ||
bc0c38d1 | 1031 | #define SAVED_CMDLINES 128 |
2c7eea4c | 1032 | #define NO_CMDLINE_MAP UINT_MAX |
bc0c38d1 SR |
1033 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; |
1034 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; | |
1035 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; | |
1036 | static int cmdline_idx; | |
edc35bd7 | 1037 | static arch_spinlock_t trace_cmdline_lock = __ARCH_SPIN_LOCK_UNLOCKED; |
25b0b44a | 1038 | |
25b0b44a | 1039 | /* temporary disable recording */ |
4fd27358 | 1040 | static atomic_t trace_record_cmdline_disabled __read_mostly; |
bc0c38d1 SR |
1041 | |
1042 | static void trace_init_cmdlines(void) | |
1043 | { | |
2c7eea4c TG |
1044 | memset(&map_pid_to_cmdline, NO_CMDLINE_MAP, sizeof(map_pid_to_cmdline)); |
1045 | memset(&map_cmdline_to_pid, NO_CMDLINE_MAP, sizeof(map_cmdline_to_pid)); | |
bc0c38d1 SR |
1046 | cmdline_idx = 0; |
1047 | } | |
1048 | ||
b5130b1e CE |
1049 | int is_tracing_stopped(void) |
1050 | { | |
2b6080f2 | 1051 | return global_trace.stop_count; |
b5130b1e CE |
1052 | } |
1053 | ||
69bb54ec SR |
1054 | /** |
1055 | * ftrace_off_permanent - disable all ftrace code permanently | |
1056 | * | |
1057 | * This should only be called when a serious anomally has | |
1058 | * been detected. This will turn off the function tracing, | |
1059 | * ring buffers, and other tracing utilites. It takes no | |
1060 | * locks and can be called from any context. | |
1061 | */ | |
1062 | void ftrace_off_permanent(void) | |
1063 | { | |
1064 | tracing_disabled = 1; | |
1065 | ftrace_stop(); | |
1066 | tracing_off_permanent(); | |
1067 | } | |
1068 | ||
0f048701 SR |
1069 | /** |
1070 | * tracing_start - quick start of the tracer | |
1071 | * | |
1072 | * If tracing is enabled but was stopped by tracing_stop, | |
1073 | * this will start the tracer back up. | |
1074 | */ | |
1075 | void tracing_start(void) | |
1076 | { | |
1077 | struct ring_buffer *buffer; | |
1078 | unsigned long flags; | |
1079 | ||
1080 | if (tracing_disabled) | |
1081 | return; | |
1082 | ||
2b6080f2 SR |
1083 | raw_spin_lock_irqsave(&global_trace.start_lock, flags); |
1084 | if (--global_trace.stop_count) { | |
1085 | if (global_trace.stop_count < 0) { | |
b06a8301 SR |
1086 | /* Someone screwed up their debugging */ |
1087 | WARN_ON_ONCE(1); | |
2b6080f2 | 1088 | global_trace.stop_count = 0; |
b06a8301 | 1089 | } |
0f048701 SR |
1090 | goto out; |
1091 | } | |
1092 | ||
a2f80714 SR |
1093 | /* Prevent the buffers from switching */ |
1094 | arch_spin_lock(&ftrace_max_lock); | |
0f048701 | 1095 | |
12883efb | 1096 | buffer = global_trace.trace_buffer.buffer; |
0f048701 SR |
1097 | if (buffer) |
1098 | ring_buffer_record_enable(buffer); | |
1099 | ||
12883efb SRRH |
1100 | #ifdef CONFIG_TRACER_MAX_TRACE |
1101 | buffer = global_trace.max_buffer.buffer; | |
0f048701 SR |
1102 | if (buffer) |
1103 | ring_buffer_record_enable(buffer); | |
12883efb | 1104 | #endif |
0f048701 | 1105 | |
a2f80714 SR |
1106 | arch_spin_unlock(&ftrace_max_lock); |
1107 | ||
0f048701 SR |
1108 | ftrace_start(); |
1109 | out: | |
2b6080f2 SR |
1110 | raw_spin_unlock_irqrestore(&global_trace.start_lock, flags); |
1111 | } | |
1112 | ||
1113 | static void tracing_start_tr(struct trace_array *tr) | |
1114 | { | |
1115 | struct ring_buffer *buffer; | |
1116 | unsigned long flags; | |
1117 | ||
1118 | if (tracing_disabled) | |
1119 | return; | |
1120 | ||
1121 | /* If global, we need to also start the max tracer */ | |
1122 | if (tr->flags & TRACE_ARRAY_FL_GLOBAL) | |
1123 | return tracing_start(); | |
1124 | ||
1125 | raw_spin_lock_irqsave(&tr->start_lock, flags); | |
1126 | ||
1127 | if (--tr->stop_count) { | |
1128 | if (tr->stop_count < 0) { | |
1129 | /* Someone screwed up their debugging */ | |
1130 | WARN_ON_ONCE(1); | |
1131 | tr->stop_count = 0; | |
1132 | } | |
1133 | goto out; | |
1134 | } | |
1135 | ||
12883efb | 1136 | buffer = tr->trace_buffer.buffer; |
2b6080f2 SR |
1137 | if (buffer) |
1138 | ring_buffer_record_enable(buffer); | |
1139 | ||
1140 | out: | |
1141 | raw_spin_unlock_irqrestore(&tr->start_lock, flags); | |
0f048701 SR |
1142 | } |
1143 | ||
1144 | /** | |
1145 | * tracing_stop - quick stop of the tracer | |
1146 | * | |
1147 | * Light weight way to stop tracing. Use in conjunction with | |
1148 | * tracing_start. | |
1149 | */ | |
1150 | void tracing_stop(void) | |
1151 | { | |
1152 | struct ring_buffer *buffer; | |
1153 | unsigned long flags; | |
1154 | ||
1155 | ftrace_stop(); | |
2b6080f2 SR |
1156 | raw_spin_lock_irqsave(&global_trace.start_lock, flags); |
1157 | if (global_trace.stop_count++) | |
0f048701 SR |
1158 | goto out; |
1159 | ||
a2f80714 SR |
1160 | /* Prevent the buffers from switching */ |
1161 | arch_spin_lock(&ftrace_max_lock); | |
1162 | ||
12883efb | 1163 | buffer = global_trace.trace_buffer.buffer; |
0f048701 SR |
1164 | if (buffer) |
1165 | ring_buffer_record_disable(buffer); | |
1166 | ||
12883efb SRRH |
1167 | #ifdef CONFIG_TRACER_MAX_TRACE |
1168 | buffer = global_trace.max_buffer.buffer; | |
0f048701 SR |
1169 | if (buffer) |
1170 | ring_buffer_record_disable(buffer); | |
12883efb | 1171 | #endif |
0f048701 | 1172 | |
a2f80714 SR |
1173 | arch_spin_unlock(&ftrace_max_lock); |
1174 | ||
0f048701 | 1175 | out: |
2b6080f2 SR |
1176 | raw_spin_unlock_irqrestore(&global_trace.start_lock, flags); |
1177 | } | |
1178 | ||
1179 | static void tracing_stop_tr(struct trace_array *tr) | |
1180 | { | |
1181 | struct ring_buffer *buffer; | |
1182 | unsigned long flags; | |
1183 | ||
1184 | /* If global, we need to also stop the max tracer */ | |
1185 | if (tr->flags & TRACE_ARRAY_FL_GLOBAL) | |
1186 | return tracing_stop(); | |
1187 | ||
1188 | raw_spin_lock_irqsave(&tr->start_lock, flags); | |
1189 | if (tr->stop_count++) | |
1190 | goto out; | |
1191 | ||
12883efb | 1192 | buffer = tr->trace_buffer.buffer; |
2b6080f2 SR |
1193 | if (buffer) |
1194 | ring_buffer_record_disable(buffer); | |
1195 | ||
1196 | out: | |
1197 | raw_spin_unlock_irqrestore(&tr->start_lock, flags); | |
0f048701 SR |
1198 | } |
1199 | ||
e309b41d | 1200 | void trace_stop_cmdline_recording(void); |
bc0c38d1 | 1201 | |
e309b41d | 1202 | static void trace_save_cmdline(struct task_struct *tsk) |
bc0c38d1 | 1203 | { |
a635cf04 | 1204 | unsigned pid, idx; |
bc0c38d1 SR |
1205 | |
1206 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) | |
1207 | return; | |
1208 | ||
1209 | /* | |
1210 | * It's not the end of the world if we don't get | |
1211 | * the lock, but we also don't want to spin | |
1212 | * nor do we want to disable interrupts, | |
1213 | * so if we miss here, then better luck next time. | |
1214 | */ | |
0199c4e6 | 1215 | if (!arch_spin_trylock(&trace_cmdline_lock)) |
bc0c38d1 SR |
1216 | return; |
1217 | ||
1218 | idx = map_pid_to_cmdline[tsk->pid]; | |
2c7eea4c | 1219 | if (idx == NO_CMDLINE_MAP) { |
bc0c38d1 SR |
1220 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; |
1221 | ||
a635cf04 CE |
1222 | /* |
1223 | * Check whether the cmdline buffer at idx has a pid | |
1224 | * mapped. We are going to overwrite that entry so we | |
1225 | * need to clear the map_pid_to_cmdline. Otherwise we | |
1226 | * would read the new comm for the old pid. | |
1227 | */ | |
1228 | pid = map_cmdline_to_pid[idx]; | |
1229 | if (pid != NO_CMDLINE_MAP) | |
1230 | map_pid_to_cmdline[pid] = NO_CMDLINE_MAP; | |
bc0c38d1 | 1231 | |
a635cf04 | 1232 | map_cmdline_to_pid[idx] = tsk->pid; |
bc0c38d1 SR |
1233 | map_pid_to_cmdline[tsk->pid] = idx; |
1234 | ||
1235 | cmdline_idx = idx; | |
1236 | } | |
1237 | ||
1238 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); | |
1239 | ||
0199c4e6 | 1240 | arch_spin_unlock(&trace_cmdline_lock); |
bc0c38d1 SR |
1241 | } |
1242 | ||
4ca53085 | 1243 | void trace_find_cmdline(int pid, char comm[]) |
bc0c38d1 | 1244 | { |
bc0c38d1 SR |
1245 | unsigned map; |
1246 | ||
4ca53085 SR |
1247 | if (!pid) { |
1248 | strcpy(comm, "<idle>"); | |
1249 | return; | |
1250 | } | |
bc0c38d1 | 1251 | |
74bf4076 SR |
1252 | if (WARN_ON_ONCE(pid < 0)) { |
1253 | strcpy(comm, "<XXX>"); | |
1254 | return; | |
1255 | } | |
1256 | ||
4ca53085 SR |
1257 | if (pid > PID_MAX_DEFAULT) { |
1258 | strcpy(comm, "<...>"); | |
1259 | return; | |
1260 | } | |
bc0c38d1 | 1261 | |
5b6045a9 | 1262 | preempt_disable(); |
0199c4e6 | 1263 | arch_spin_lock(&trace_cmdline_lock); |
bc0c38d1 | 1264 | map = map_pid_to_cmdline[pid]; |
50d88758 TG |
1265 | if (map != NO_CMDLINE_MAP) |
1266 | strcpy(comm, saved_cmdlines[map]); | |
1267 | else | |
1268 | strcpy(comm, "<...>"); | |
bc0c38d1 | 1269 | |
0199c4e6 | 1270 | arch_spin_unlock(&trace_cmdline_lock); |
5b6045a9 | 1271 | preempt_enable(); |
bc0c38d1 SR |
1272 | } |
1273 | ||
e309b41d | 1274 | void tracing_record_cmdline(struct task_struct *tsk) |
bc0c38d1 | 1275 | { |
0fb9656d | 1276 | if (atomic_read(&trace_record_cmdline_disabled) || !tracing_is_on()) |
bc0c38d1 SR |
1277 | return; |
1278 | ||
7ffbd48d SR |
1279 | if (!__this_cpu_read(trace_cmdline_save)) |
1280 | return; | |
1281 | ||
1282 | __this_cpu_write(trace_cmdline_save, false); | |
1283 | ||
bc0c38d1 SR |
1284 | trace_save_cmdline(tsk); |
1285 | } | |
1286 | ||
45dcd8b8 | 1287 | void |
38697053 SR |
1288 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags, |
1289 | int pc) | |
bc0c38d1 SR |
1290 | { |
1291 | struct task_struct *tsk = current; | |
bc0c38d1 | 1292 | |
777e208d SR |
1293 | entry->preempt_count = pc & 0xff; |
1294 | entry->pid = (tsk) ? tsk->pid : 0; | |
1295 | entry->flags = | |
9244489a | 1296 | #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT |
2e2ca155 | 1297 | (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
9244489a SR |
1298 | #else |
1299 | TRACE_FLAG_IRQS_NOSUPPORT | | |
1300 | #endif | |
bc0c38d1 SR |
1301 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
1302 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | | |
1303 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); | |
1304 | } | |
f413cdb8 | 1305 | EXPORT_SYMBOL_GPL(tracing_generic_entry_update); |
bc0c38d1 | 1306 | |
e77405ad SR |
1307 | struct ring_buffer_event * |
1308 | trace_buffer_lock_reserve(struct ring_buffer *buffer, | |
1309 | int type, | |
1310 | unsigned long len, | |
1311 | unsigned long flags, int pc) | |
51a763dd ACM |
1312 | { |
1313 | struct ring_buffer_event *event; | |
1314 | ||
e77405ad | 1315 | event = ring_buffer_lock_reserve(buffer, len); |
51a763dd ACM |
1316 | if (event != NULL) { |
1317 | struct trace_entry *ent = ring_buffer_event_data(event); | |
1318 | ||
1319 | tracing_generic_entry_update(ent, flags, pc); | |
1320 | ent->type = type; | |
1321 | } | |
1322 | ||
1323 | return event; | |
1324 | } | |
51a763dd | 1325 | |
7ffbd48d SR |
1326 | void |
1327 | __buffer_unlock_commit(struct ring_buffer *buffer, struct ring_buffer_event *event) | |
1328 | { | |
1329 | __this_cpu_write(trace_cmdline_save, true); | |
1330 | ring_buffer_unlock_commit(buffer, event); | |
1331 | } | |
1332 | ||
e77405ad SR |
1333 | static inline void |
1334 | __trace_buffer_unlock_commit(struct ring_buffer *buffer, | |
1335 | struct ring_buffer_event *event, | |
0d5c6e1c | 1336 | unsigned long flags, int pc) |
51a763dd | 1337 | { |
7ffbd48d | 1338 | __buffer_unlock_commit(buffer, event); |
51a763dd | 1339 | |
e77405ad SR |
1340 | ftrace_trace_stack(buffer, flags, 6, pc); |
1341 | ftrace_trace_userstack(buffer, flags, pc); | |
07edf712 FW |
1342 | } |
1343 | ||
e77405ad SR |
1344 | void trace_buffer_unlock_commit(struct ring_buffer *buffer, |
1345 | struct ring_buffer_event *event, | |
1346 | unsigned long flags, int pc) | |
07edf712 | 1347 | { |
0d5c6e1c | 1348 | __trace_buffer_unlock_commit(buffer, event, flags, pc); |
51a763dd | 1349 | } |
0d5c6e1c | 1350 | EXPORT_SYMBOL_GPL(trace_buffer_unlock_commit); |
51a763dd | 1351 | |
ccb469a1 SR |
1352 | struct ring_buffer_event * |
1353 | trace_event_buffer_lock_reserve(struct ring_buffer **current_rb, | |
1354 | struct ftrace_event_file *ftrace_file, | |
1355 | int type, unsigned long len, | |
1356 | unsigned long flags, int pc) | |
1357 | { | |
12883efb | 1358 | *current_rb = ftrace_file->tr->trace_buffer.buffer; |
ccb469a1 SR |
1359 | return trace_buffer_lock_reserve(*current_rb, |
1360 | type, len, flags, pc); | |
1361 | } | |
1362 | EXPORT_SYMBOL_GPL(trace_event_buffer_lock_reserve); | |
1363 | ||
ef5580d0 | 1364 | struct ring_buffer_event * |
e77405ad SR |
1365 | trace_current_buffer_lock_reserve(struct ring_buffer **current_rb, |
1366 | int type, unsigned long len, | |
ef5580d0 SR |
1367 | unsigned long flags, int pc) |
1368 | { | |
12883efb | 1369 | *current_rb = global_trace.trace_buffer.buffer; |
e77405ad | 1370 | return trace_buffer_lock_reserve(*current_rb, |
ef5580d0 SR |
1371 | type, len, flags, pc); |
1372 | } | |
94487d6d | 1373 | EXPORT_SYMBOL_GPL(trace_current_buffer_lock_reserve); |
ef5580d0 | 1374 | |
e77405ad SR |
1375 | void trace_current_buffer_unlock_commit(struct ring_buffer *buffer, |
1376 | struct ring_buffer_event *event, | |
ef5580d0 SR |
1377 | unsigned long flags, int pc) |
1378 | { | |
0d5c6e1c | 1379 | __trace_buffer_unlock_commit(buffer, event, flags, pc); |
07edf712 | 1380 | } |
94487d6d | 1381 | EXPORT_SYMBOL_GPL(trace_current_buffer_unlock_commit); |
07edf712 | 1382 | |
0d5c6e1c SR |
1383 | void trace_buffer_unlock_commit_regs(struct ring_buffer *buffer, |
1384 | struct ring_buffer_event *event, | |
1385 | unsigned long flags, int pc, | |
1386 | struct pt_regs *regs) | |
1fd8df2c | 1387 | { |
7ffbd48d | 1388 | __buffer_unlock_commit(buffer, event); |
1fd8df2c MH |
1389 | |
1390 | ftrace_trace_stack_regs(buffer, flags, 0, pc, regs); | |
1391 | ftrace_trace_userstack(buffer, flags, pc); | |
1392 | } | |
0d5c6e1c | 1393 | EXPORT_SYMBOL_GPL(trace_buffer_unlock_commit_regs); |
1fd8df2c | 1394 | |
e77405ad SR |
1395 | void trace_current_buffer_discard_commit(struct ring_buffer *buffer, |
1396 | struct ring_buffer_event *event) | |
77d9f465 | 1397 | { |
e77405ad | 1398 | ring_buffer_discard_commit(buffer, event); |
ef5580d0 | 1399 | } |
12acd473 | 1400 | EXPORT_SYMBOL_GPL(trace_current_buffer_discard_commit); |
ef5580d0 | 1401 | |
e309b41d | 1402 | void |
7be42151 | 1403 | trace_function(struct trace_array *tr, |
38697053 SR |
1404 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
1405 | int pc) | |
bc0c38d1 | 1406 | { |
e1112b4d | 1407 | struct ftrace_event_call *call = &event_function; |
12883efb | 1408 | struct ring_buffer *buffer = tr->trace_buffer.buffer; |
3928a8a2 | 1409 | struct ring_buffer_event *event; |
777e208d | 1410 | struct ftrace_entry *entry; |
bc0c38d1 | 1411 | |
d769041f | 1412 | /* If we are reading the ring buffer, don't trace */ |
dd17c8f7 | 1413 | if (unlikely(__this_cpu_read(ftrace_cpu_disabled))) |
d769041f SR |
1414 | return; |
1415 | ||
e77405ad | 1416 | event = trace_buffer_lock_reserve(buffer, TRACE_FN, sizeof(*entry), |
51a763dd | 1417 | flags, pc); |
3928a8a2 SR |
1418 | if (!event) |
1419 | return; | |
1420 | entry = ring_buffer_event_data(event); | |
777e208d SR |
1421 | entry->ip = ip; |
1422 | entry->parent_ip = parent_ip; | |
e1112b4d | 1423 | |
e77405ad | 1424 | if (!filter_check_discard(call, entry, buffer, event)) |
7ffbd48d | 1425 | __buffer_unlock_commit(buffer, event); |
bc0c38d1 SR |
1426 | } |
1427 | ||
e309b41d | 1428 | void |
2e0f5761 | 1429 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
38697053 SR |
1430 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
1431 | int pc) | |
2e0f5761 IM |
1432 | { |
1433 | if (likely(!atomic_read(&data->disabled))) | |
7be42151 | 1434 | trace_function(tr, ip, parent_ip, flags, pc); |
2e0f5761 IM |
1435 | } |
1436 | ||
c0a0d0d3 | 1437 | #ifdef CONFIG_STACKTRACE |
4a9bd3f1 SR |
1438 | |
1439 | #define FTRACE_STACK_MAX_ENTRIES (PAGE_SIZE / sizeof(unsigned long)) | |
1440 | struct ftrace_stack { | |
1441 | unsigned long calls[FTRACE_STACK_MAX_ENTRIES]; | |
1442 | }; | |
1443 | ||
1444 | static DEFINE_PER_CPU(struct ftrace_stack, ftrace_stack); | |
1445 | static DEFINE_PER_CPU(int, ftrace_stack_reserve); | |
1446 | ||
e77405ad | 1447 | static void __ftrace_trace_stack(struct ring_buffer *buffer, |
53614991 | 1448 | unsigned long flags, |
1fd8df2c | 1449 | int skip, int pc, struct pt_regs *regs) |
86387f7e | 1450 | { |
e1112b4d | 1451 | struct ftrace_event_call *call = &event_kernel_stack; |
3928a8a2 | 1452 | struct ring_buffer_event *event; |
777e208d | 1453 | struct stack_entry *entry; |
86387f7e | 1454 | struct stack_trace trace; |
4a9bd3f1 SR |
1455 | int use_stack; |
1456 | int size = FTRACE_STACK_ENTRIES; | |
1457 | ||
1458 | trace.nr_entries = 0; | |
1459 | trace.skip = skip; | |
1460 | ||
1461 | /* | |
1462 | * Since events can happen in NMIs there's no safe way to | |
1463 | * use the per cpu ftrace_stacks. We reserve it and if an interrupt | |
1464 | * or NMI comes in, it will just have to use the default | |
1465 | * FTRACE_STACK_SIZE. | |
1466 | */ | |
1467 | preempt_disable_notrace(); | |
1468 | ||
82146529 | 1469 | use_stack = __this_cpu_inc_return(ftrace_stack_reserve); |
4a9bd3f1 SR |
1470 | /* |
1471 | * We don't need any atomic variables, just a barrier. | |
1472 | * If an interrupt comes in, we don't care, because it would | |
1473 | * have exited and put the counter back to what we want. | |
1474 | * We just need a barrier to keep gcc from moving things | |
1475 | * around. | |
1476 | */ | |
1477 | barrier(); | |
1478 | if (use_stack == 1) { | |
1479 | trace.entries = &__get_cpu_var(ftrace_stack).calls[0]; | |
1480 | trace.max_entries = FTRACE_STACK_MAX_ENTRIES; | |
1481 | ||
1482 | if (regs) | |
1483 | save_stack_trace_regs(regs, &trace); | |
1484 | else | |
1485 | save_stack_trace(&trace); | |
1486 | ||
1487 | if (trace.nr_entries > size) | |
1488 | size = trace.nr_entries; | |
1489 | } else | |
1490 | /* From now on, use_stack is a boolean */ | |
1491 | use_stack = 0; | |
1492 | ||
1493 | size *= sizeof(unsigned long); | |
86387f7e | 1494 | |
e77405ad | 1495 | event = trace_buffer_lock_reserve(buffer, TRACE_STACK, |
4a9bd3f1 | 1496 | sizeof(*entry) + size, flags, pc); |
3928a8a2 | 1497 | if (!event) |
4a9bd3f1 SR |
1498 | goto out; |
1499 | entry = ring_buffer_event_data(event); | |
86387f7e | 1500 | |
4a9bd3f1 SR |
1501 | memset(&entry->caller, 0, size); |
1502 | ||
1503 | if (use_stack) | |
1504 | memcpy(&entry->caller, trace.entries, | |
1505 | trace.nr_entries * sizeof(unsigned long)); | |
1506 | else { | |
1507 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
1508 | trace.entries = entry->caller; | |
1509 | if (regs) | |
1510 | save_stack_trace_regs(regs, &trace); | |
1511 | else | |
1512 | save_stack_trace(&trace); | |
1513 | } | |
1514 | ||
1515 | entry->size = trace.nr_entries; | |
86387f7e | 1516 | |
e77405ad | 1517 | if (!filter_check_discard(call, entry, buffer, event)) |
7ffbd48d | 1518 | __buffer_unlock_commit(buffer, event); |
4a9bd3f1 SR |
1519 | |
1520 | out: | |
1521 | /* Again, don't let gcc optimize things here */ | |
1522 | barrier(); | |
82146529 | 1523 | __this_cpu_dec(ftrace_stack_reserve); |
4a9bd3f1 SR |
1524 | preempt_enable_notrace(); |
1525 | ||
f0a920d5 IM |
1526 | } |
1527 | ||
1fd8df2c MH |
1528 | void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags, |
1529 | int skip, int pc, struct pt_regs *regs) | |
1530 | { | |
1531 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) | |
1532 | return; | |
1533 | ||
1534 | __ftrace_trace_stack(buffer, flags, skip, pc, regs); | |
1535 | } | |
1536 | ||
e77405ad SR |
1537 | void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags, |
1538 | int skip, int pc) | |
53614991 SR |
1539 | { |
1540 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) | |
1541 | return; | |
1542 | ||
1fd8df2c | 1543 | __ftrace_trace_stack(buffer, flags, skip, pc, NULL); |
53614991 SR |
1544 | } |
1545 | ||
c0a0d0d3 FW |
1546 | void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, |
1547 | int pc) | |
38697053 | 1548 | { |
12883efb | 1549 | __ftrace_trace_stack(tr->trace_buffer.buffer, flags, skip, pc, NULL); |
38697053 SR |
1550 | } |
1551 | ||
03889384 SR |
1552 | /** |
1553 | * trace_dump_stack - record a stack back trace in the trace buffer | |
1554 | */ | |
1555 | void trace_dump_stack(void) | |
1556 | { | |
1557 | unsigned long flags; | |
1558 | ||
1559 | if (tracing_disabled || tracing_selftest_running) | |
e36c5458 | 1560 | return; |
03889384 SR |
1561 | |
1562 | local_save_flags(flags); | |
1563 | ||
1564 | /* skipping 3 traces, seems to get us at the caller of this function */ | |
12883efb SRRH |
1565 | __ftrace_trace_stack(global_trace.trace_buffer.buffer, flags, 3, |
1566 | preempt_count(), NULL); | |
03889384 SR |
1567 | } |
1568 | ||
91e86e56 SR |
1569 | static DEFINE_PER_CPU(int, user_stack_count); |
1570 | ||
e77405ad SR |
1571 | void |
1572 | ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, int pc) | |
02b67518 | 1573 | { |
e1112b4d | 1574 | struct ftrace_event_call *call = &event_user_stack; |
8d7c6a96 | 1575 | struct ring_buffer_event *event; |
02b67518 TE |
1576 | struct userstack_entry *entry; |
1577 | struct stack_trace trace; | |
02b67518 TE |
1578 | |
1579 | if (!(trace_flags & TRACE_ITER_USERSTACKTRACE)) | |
1580 | return; | |
1581 | ||
b6345879 SR |
1582 | /* |
1583 | * NMIs can not handle page faults, even with fix ups. | |
1584 | * The save user stack can (and often does) fault. | |
1585 | */ | |
1586 | if (unlikely(in_nmi())) | |
1587 | return; | |
02b67518 | 1588 | |
91e86e56 SR |
1589 | /* |
1590 | * prevent recursion, since the user stack tracing may | |
1591 | * trigger other kernel events. | |
1592 | */ | |
1593 | preempt_disable(); | |
1594 | if (__this_cpu_read(user_stack_count)) | |
1595 | goto out; | |
1596 | ||
1597 | __this_cpu_inc(user_stack_count); | |
1598 | ||
e77405ad | 1599 | event = trace_buffer_lock_reserve(buffer, TRACE_USER_STACK, |
51a763dd | 1600 | sizeof(*entry), flags, pc); |
02b67518 | 1601 | if (!event) |
1dbd1951 | 1602 | goto out_drop_count; |
02b67518 | 1603 | entry = ring_buffer_event_data(event); |
02b67518 | 1604 | |
48659d31 | 1605 | entry->tgid = current->tgid; |
02b67518 TE |
1606 | memset(&entry->caller, 0, sizeof(entry->caller)); |
1607 | ||
1608 | trace.nr_entries = 0; | |
1609 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
1610 | trace.skip = 0; | |
1611 | trace.entries = entry->caller; | |
1612 | ||
1613 | save_stack_trace_user(&trace); | |
e77405ad | 1614 | if (!filter_check_discard(call, entry, buffer, event)) |
7ffbd48d | 1615 | __buffer_unlock_commit(buffer, event); |
91e86e56 | 1616 | |
1dbd1951 | 1617 | out_drop_count: |
91e86e56 | 1618 | __this_cpu_dec(user_stack_count); |
91e86e56 SR |
1619 | out: |
1620 | preempt_enable(); | |
02b67518 TE |
1621 | } |
1622 | ||
4fd27358 HE |
1623 | #ifdef UNUSED |
1624 | static void __trace_userstack(struct trace_array *tr, unsigned long flags) | |
02b67518 | 1625 | { |
7be42151 | 1626 | ftrace_trace_userstack(tr, flags, preempt_count()); |
02b67518 | 1627 | } |
4fd27358 | 1628 | #endif /* UNUSED */ |
02b67518 | 1629 | |
c0a0d0d3 FW |
1630 | #endif /* CONFIG_STACKTRACE */ |
1631 | ||
07d777fe SR |
1632 | /* created for use with alloc_percpu */ |
1633 | struct trace_buffer_struct { | |
1634 | char buffer[TRACE_BUF_SIZE]; | |
1635 | }; | |
1636 | ||
1637 | static struct trace_buffer_struct *trace_percpu_buffer; | |
1638 | static struct trace_buffer_struct *trace_percpu_sirq_buffer; | |
1639 | static struct trace_buffer_struct *trace_percpu_irq_buffer; | |
1640 | static struct trace_buffer_struct *trace_percpu_nmi_buffer; | |
1641 | ||
1642 | /* | |
1643 | * The buffer used is dependent on the context. There is a per cpu | |
1644 | * buffer for normal context, softirq contex, hard irq context and | |
1645 | * for NMI context. Thise allows for lockless recording. | |
1646 | * | |
1647 | * Note, if the buffers failed to be allocated, then this returns NULL | |
1648 | */ | |
1649 | static char *get_trace_buf(void) | |
1650 | { | |
1651 | struct trace_buffer_struct *percpu_buffer; | |
07d777fe SR |
1652 | |
1653 | /* | |
1654 | * If we have allocated per cpu buffers, then we do not | |
1655 | * need to do any locking. | |
1656 | */ | |
1657 | if (in_nmi()) | |
1658 | percpu_buffer = trace_percpu_nmi_buffer; | |
1659 | else if (in_irq()) | |
1660 | percpu_buffer = trace_percpu_irq_buffer; | |
1661 | else if (in_softirq()) | |
1662 | percpu_buffer = trace_percpu_sirq_buffer; | |
1663 | else | |
1664 | percpu_buffer = trace_percpu_buffer; | |
1665 | ||
1666 | if (!percpu_buffer) | |
1667 | return NULL; | |
1668 | ||
d8a0349c | 1669 | return this_cpu_ptr(&percpu_buffer->buffer[0]); |
07d777fe SR |
1670 | } |
1671 | ||
1672 | static int alloc_percpu_trace_buffer(void) | |
1673 | { | |
1674 | struct trace_buffer_struct *buffers; | |
1675 | struct trace_buffer_struct *sirq_buffers; | |
1676 | struct trace_buffer_struct *irq_buffers; | |
1677 | struct trace_buffer_struct *nmi_buffers; | |
1678 | ||
1679 | buffers = alloc_percpu(struct trace_buffer_struct); | |
1680 | if (!buffers) | |
1681 | goto err_warn; | |
1682 | ||
1683 | sirq_buffers = alloc_percpu(struct trace_buffer_struct); | |
1684 | if (!sirq_buffers) | |
1685 | goto err_sirq; | |
1686 | ||
1687 | irq_buffers = alloc_percpu(struct trace_buffer_struct); | |
1688 | if (!irq_buffers) | |
1689 | goto err_irq; | |
1690 | ||
1691 | nmi_buffers = alloc_percpu(struct trace_buffer_struct); | |
1692 | if (!nmi_buffers) | |
1693 | goto err_nmi; | |
1694 | ||
1695 | trace_percpu_buffer = buffers; | |
1696 | trace_percpu_sirq_buffer = sirq_buffers; | |
1697 | trace_percpu_irq_buffer = irq_buffers; | |
1698 | trace_percpu_nmi_buffer = nmi_buffers; | |
1699 | ||
1700 | return 0; | |
1701 | ||
1702 | err_nmi: | |
1703 | free_percpu(irq_buffers); | |
1704 | err_irq: | |
1705 | free_percpu(sirq_buffers); | |
1706 | err_sirq: | |
1707 | free_percpu(buffers); | |
1708 | err_warn: | |
1709 | WARN(1, "Could not allocate percpu trace_printk buffer"); | |
1710 | return -ENOMEM; | |
1711 | } | |
1712 | ||
81698831 SR |
1713 | static int buffers_allocated; |
1714 | ||
07d777fe SR |
1715 | void trace_printk_init_buffers(void) |
1716 | { | |
07d777fe SR |
1717 | if (buffers_allocated) |
1718 | return; | |
1719 | ||
1720 | if (alloc_percpu_trace_buffer()) | |
1721 | return; | |
1722 | ||
1723 | pr_info("ftrace: Allocated trace_printk buffers\n"); | |
1724 | ||
b382ede6 SR |
1725 | /* Expand the buffers to set size */ |
1726 | tracing_update_buffers(); | |
1727 | ||
07d777fe | 1728 | buffers_allocated = 1; |
81698831 SR |
1729 | |
1730 | /* | |
1731 | * trace_printk_init_buffers() can be called by modules. | |
1732 | * If that happens, then we need to start cmdline recording | |
1733 | * directly here. If the global_trace.buffer is already | |
1734 | * allocated here, then this was called by module code. | |
1735 | */ | |
12883efb | 1736 | if (global_trace.trace_buffer.buffer) |
81698831 SR |
1737 | tracing_start_cmdline_record(); |
1738 | } | |
1739 | ||
1740 | void trace_printk_start_comm(void) | |
1741 | { | |
1742 | /* Start tracing comms if trace printk is set */ | |
1743 | if (!buffers_allocated) | |
1744 | return; | |
1745 | tracing_start_cmdline_record(); | |
1746 | } | |
1747 | ||
1748 | static void trace_printk_start_stop_comm(int enabled) | |
1749 | { | |
1750 | if (!buffers_allocated) | |
1751 | return; | |
1752 | ||
1753 | if (enabled) | |
1754 | tracing_start_cmdline_record(); | |
1755 | else | |
1756 | tracing_stop_cmdline_record(); | |
07d777fe SR |
1757 | } |
1758 | ||
769b0441 | 1759 | /** |
48ead020 | 1760 | * trace_vbprintk - write binary msg to tracing buffer |
769b0441 FW |
1761 | * |
1762 | */ | |
40ce74f1 | 1763 | int trace_vbprintk(unsigned long ip, const char *fmt, va_list args) |
769b0441 | 1764 | { |
e1112b4d | 1765 | struct ftrace_event_call *call = &event_bprint; |
769b0441 | 1766 | struct ring_buffer_event *event; |
e77405ad | 1767 | struct ring_buffer *buffer; |
769b0441 | 1768 | struct trace_array *tr = &global_trace; |
48ead020 | 1769 | struct bprint_entry *entry; |
769b0441 | 1770 | unsigned long flags; |
07d777fe SR |
1771 | char *tbuffer; |
1772 | int len = 0, size, pc; | |
769b0441 FW |
1773 | |
1774 | if (unlikely(tracing_selftest_running || tracing_disabled)) | |
1775 | return 0; | |
1776 | ||
1777 | /* Don't pollute graph traces with trace_vprintk internals */ | |
1778 | pause_graph_tracing(); | |
1779 | ||
1780 | pc = preempt_count(); | |
5168ae50 | 1781 | preempt_disable_notrace(); |
769b0441 | 1782 | |
07d777fe SR |
1783 | tbuffer = get_trace_buf(); |
1784 | if (!tbuffer) { | |
1785 | len = 0; | |
769b0441 | 1786 | goto out; |
07d777fe | 1787 | } |
769b0441 | 1788 | |
07d777fe | 1789 | len = vbin_printf((u32 *)tbuffer, TRACE_BUF_SIZE/sizeof(int), fmt, args); |
769b0441 | 1790 | |
07d777fe SR |
1791 | if (len > TRACE_BUF_SIZE/sizeof(int) || len < 0) |
1792 | goto out; | |
769b0441 | 1793 | |
07d777fe | 1794 | local_save_flags(flags); |
769b0441 | 1795 | size = sizeof(*entry) + sizeof(u32) * len; |
12883efb | 1796 | buffer = tr->trace_buffer.buffer; |
e77405ad SR |
1797 | event = trace_buffer_lock_reserve(buffer, TRACE_BPRINT, size, |
1798 | flags, pc); | |
769b0441 | 1799 | if (!event) |
07d777fe | 1800 | goto out; |
769b0441 FW |
1801 | entry = ring_buffer_event_data(event); |
1802 | entry->ip = ip; | |
769b0441 FW |
1803 | entry->fmt = fmt; |
1804 | ||
07d777fe | 1805 | memcpy(entry->buf, tbuffer, sizeof(u32) * len); |
d931369b | 1806 | if (!filter_check_discard(call, entry, buffer, event)) { |
7ffbd48d | 1807 | __buffer_unlock_commit(buffer, event); |
d931369b SR |
1808 | ftrace_trace_stack(buffer, flags, 6, pc); |
1809 | } | |
769b0441 | 1810 | |
769b0441 | 1811 | out: |
5168ae50 | 1812 | preempt_enable_notrace(); |
769b0441 FW |
1813 | unpause_graph_tracing(); |
1814 | ||
1815 | return len; | |
1816 | } | |
48ead020 FW |
1817 | EXPORT_SYMBOL_GPL(trace_vbprintk); |
1818 | ||
12883efb SRRH |
1819 | static int |
1820 | __trace_array_vprintk(struct ring_buffer *buffer, | |
1821 | unsigned long ip, const char *fmt, va_list args) | |
48ead020 | 1822 | { |
e1112b4d | 1823 | struct ftrace_event_call *call = &event_print; |
48ead020 | 1824 | struct ring_buffer_event *event; |
07d777fe | 1825 | int len = 0, size, pc; |
48ead020 | 1826 | struct print_entry *entry; |
07d777fe SR |
1827 | unsigned long flags; |
1828 | char *tbuffer; | |
48ead020 FW |
1829 | |
1830 | if (tracing_disabled || tracing_selftest_running) | |
1831 | return 0; | |
1832 | ||
07d777fe SR |
1833 | /* Don't pollute graph traces with trace_vprintk internals */ |
1834 | pause_graph_tracing(); | |
1835 | ||
48ead020 FW |
1836 | pc = preempt_count(); |
1837 | preempt_disable_notrace(); | |
48ead020 | 1838 | |
07d777fe SR |
1839 | |
1840 | tbuffer = get_trace_buf(); | |
1841 | if (!tbuffer) { | |
1842 | len = 0; | |
48ead020 | 1843 | goto out; |
07d777fe | 1844 | } |
48ead020 | 1845 | |
07d777fe SR |
1846 | len = vsnprintf(tbuffer, TRACE_BUF_SIZE, fmt, args); |
1847 | if (len > TRACE_BUF_SIZE) | |
1848 | goto out; | |
48ead020 | 1849 | |
07d777fe | 1850 | local_save_flags(flags); |
48ead020 | 1851 | size = sizeof(*entry) + len + 1; |
e77405ad | 1852 | event = trace_buffer_lock_reserve(buffer, TRACE_PRINT, size, |
07d777fe | 1853 | flags, pc); |
48ead020 | 1854 | if (!event) |
07d777fe | 1855 | goto out; |
48ead020 | 1856 | entry = ring_buffer_event_data(event); |
c13d2f7c | 1857 | entry->ip = ip; |
48ead020 | 1858 | |
07d777fe | 1859 | memcpy(&entry->buf, tbuffer, len); |
c13d2f7c | 1860 | entry->buf[len] = '\0'; |
d931369b | 1861 | if (!filter_check_discard(call, entry, buffer, event)) { |
7ffbd48d | 1862 | __buffer_unlock_commit(buffer, event); |
07d777fe | 1863 | ftrace_trace_stack(buffer, flags, 6, pc); |
d931369b | 1864 | } |
48ead020 FW |
1865 | out: |
1866 | preempt_enable_notrace(); | |
07d777fe | 1867 | unpause_graph_tracing(); |
48ead020 FW |
1868 | |
1869 | return len; | |
1870 | } | |
659372d3 | 1871 | |
12883efb SRRH |
1872 | int trace_array_vprintk(struct trace_array *tr, |
1873 | unsigned long ip, const char *fmt, va_list args) | |
1874 | { | |
1875 | return __trace_array_vprintk(tr->trace_buffer.buffer, ip, fmt, args); | |
1876 | } | |
1877 | ||
1878 | int trace_array_printk(struct trace_array *tr, | |
1879 | unsigned long ip, const char *fmt, ...) | |
1880 | { | |
1881 | int ret; | |
1882 | va_list ap; | |
1883 | ||
1884 | if (!(trace_flags & TRACE_ITER_PRINTK)) | |
1885 | return 0; | |
1886 | ||
1887 | va_start(ap, fmt); | |
1888 | ret = trace_array_vprintk(tr, ip, fmt, ap); | |
1889 | va_end(ap); | |
1890 | return ret; | |
1891 | } | |
1892 | ||
1893 | int trace_array_printk_buf(struct ring_buffer *buffer, | |
1894 | unsigned long ip, const char *fmt, ...) | |
1895 | { | |
1896 | int ret; | |
1897 | va_list ap; | |
1898 | ||
1899 | if (!(trace_flags & TRACE_ITER_PRINTK)) | |
1900 | return 0; | |
1901 | ||
1902 | va_start(ap, fmt); | |
1903 | ret = __trace_array_vprintk(buffer, ip, fmt, ap); | |
1904 | va_end(ap); | |
1905 | return ret; | |
1906 | } | |
1907 | ||
659372d3 SR |
1908 | int trace_vprintk(unsigned long ip, const char *fmt, va_list args) |
1909 | { | |
a813a159 | 1910 | return trace_array_vprintk(&global_trace, ip, fmt, args); |
659372d3 | 1911 | } |
769b0441 FW |
1912 | EXPORT_SYMBOL_GPL(trace_vprintk); |
1913 | ||
e2ac8ef5 | 1914 | static void trace_iterator_increment(struct trace_iterator *iter) |
5a90f577 | 1915 | { |
6d158a81 SR |
1916 | struct ring_buffer_iter *buf_iter = trace_buffer_iter(iter, iter->cpu); |
1917 | ||
5a90f577 | 1918 | iter->idx++; |
6d158a81 SR |
1919 | if (buf_iter) |
1920 | ring_buffer_read(buf_iter, NULL); | |
5a90f577 SR |
1921 | } |
1922 | ||
e309b41d | 1923 | static struct trace_entry * |
bc21b478 SR |
1924 | peek_next_entry(struct trace_iterator *iter, int cpu, u64 *ts, |
1925 | unsigned long *lost_events) | |
dd0e545f | 1926 | { |
3928a8a2 | 1927 | struct ring_buffer_event *event; |
6d158a81 | 1928 | struct ring_buffer_iter *buf_iter = trace_buffer_iter(iter, cpu); |
dd0e545f | 1929 | |
d769041f SR |
1930 | if (buf_iter) |
1931 | event = ring_buffer_iter_peek(buf_iter, ts); | |
1932 | else | |
12883efb | 1933 | event = ring_buffer_peek(iter->trace_buffer->buffer, cpu, ts, |
bc21b478 | 1934 | lost_events); |
d769041f | 1935 | |
4a9bd3f1 SR |
1936 | if (event) { |
1937 | iter->ent_size = ring_buffer_event_length(event); | |
1938 | return ring_buffer_event_data(event); | |
1939 | } | |
1940 | iter->ent_size = 0; | |
1941 | return NULL; | |
dd0e545f | 1942 | } |
d769041f | 1943 | |
dd0e545f | 1944 | static struct trace_entry * |
bc21b478 SR |
1945 | __find_next_entry(struct trace_iterator *iter, int *ent_cpu, |
1946 | unsigned long *missing_events, u64 *ent_ts) | |
bc0c38d1 | 1947 | { |
12883efb | 1948 | struct ring_buffer *buffer = iter->trace_buffer->buffer; |
bc0c38d1 | 1949 | struct trace_entry *ent, *next = NULL; |
aa27497c | 1950 | unsigned long lost_events = 0, next_lost = 0; |
b04cc6b1 | 1951 | int cpu_file = iter->cpu_file; |
3928a8a2 | 1952 | u64 next_ts = 0, ts; |
bc0c38d1 | 1953 | int next_cpu = -1; |
12b5da34 | 1954 | int next_size = 0; |
bc0c38d1 SR |
1955 | int cpu; |
1956 | ||
b04cc6b1 FW |
1957 | /* |
1958 | * If we are in a per_cpu trace file, don't bother by iterating over | |
1959 | * all cpu and peek directly. | |
1960 | */ | |
ae3b5093 | 1961 | if (cpu_file > RING_BUFFER_ALL_CPUS) { |
b04cc6b1 FW |
1962 | if (ring_buffer_empty_cpu(buffer, cpu_file)) |
1963 | return NULL; | |
bc21b478 | 1964 | ent = peek_next_entry(iter, cpu_file, ent_ts, missing_events); |
b04cc6b1 FW |
1965 | if (ent_cpu) |
1966 | *ent_cpu = cpu_file; | |
1967 | ||
1968 | return ent; | |
1969 | } | |
1970 | ||
ab46428c | 1971 | for_each_tracing_cpu(cpu) { |
dd0e545f | 1972 | |
3928a8a2 SR |
1973 | if (ring_buffer_empty_cpu(buffer, cpu)) |
1974 | continue; | |
dd0e545f | 1975 | |
bc21b478 | 1976 | ent = peek_next_entry(iter, cpu, &ts, &lost_events); |
dd0e545f | 1977 | |
cdd31cd2 IM |
1978 | /* |
1979 | * Pick the entry with the smallest timestamp: | |
1980 | */ | |
3928a8a2 | 1981 | if (ent && (!next || ts < next_ts)) { |
bc0c38d1 SR |
1982 | next = ent; |
1983 | next_cpu = cpu; | |
3928a8a2 | 1984 | next_ts = ts; |
bc21b478 | 1985 | next_lost = lost_events; |
12b5da34 | 1986 | next_size = iter->ent_size; |
bc0c38d1 SR |
1987 | } |
1988 | } | |
1989 | ||
12b5da34 SR |
1990 | iter->ent_size = next_size; |
1991 | ||
bc0c38d1 SR |
1992 | if (ent_cpu) |
1993 | *ent_cpu = next_cpu; | |
1994 | ||
3928a8a2 SR |
1995 | if (ent_ts) |
1996 | *ent_ts = next_ts; | |
1997 | ||
bc21b478 SR |
1998 | if (missing_events) |
1999 | *missing_events = next_lost; | |
2000 | ||
bc0c38d1 SR |
2001 | return next; |
2002 | } | |
2003 | ||
dd0e545f | 2004 | /* Find the next real entry, without updating the iterator itself */ |
c4a8e8be FW |
2005 | struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, |
2006 | int *ent_cpu, u64 *ent_ts) | |
bc0c38d1 | 2007 | { |
bc21b478 | 2008 | return __find_next_entry(iter, ent_cpu, NULL, ent_ts); |
dd0e545f SR |
2009 | } |
2010 | ||
2011 | /* Find the next real entry, and increment the iterator to the next entry */ | |
955b61e5 | 2012 | void *trace_find_next_entry_inc(struct trace_iterator *iter) |
dd0e545f | 2013 | { |
bc21b478 SR |
2014 | iter->ent = __find_next_entry(iter, &iter->cpu, |
2015 | &iter->lost_events, &iter->ts); | |
dd0e545f | 2016 | |
3928a8a2 | 2017 | if (iter->ent) |
e2ac8ef5 | 2018 | trace_iterator_increment(iter); |
dd0e545f | 2019 | |
3928a8a2 | 2020 | return iter->ent ? iter : NULL; |
b3806b43 | 2021 | } |
bc0c38d1 | 2022 | |
e309b41d | 2023 | static void trace_consume(struct trace_iterator *iter) |
b3806b43 | 2024 | { |
12883efb | 2025 | ring_buffer_consume(iter->trace_buffer->buffer, iter->cpu, &iter->ts, |
bc21b478 | 2026 | &iter->lost_events); |
bc0c38d1 SR |
2027 | } |
2028 | ||
e309b41d | 2029 | static void *s_next(struct seq_file *m, void *v, loff_t *pos) |
bc0c38d1 SR |
2030 | { |
2031 | struct trace_iterator *iter = m->private; | |
bc0c38d1 | 2032 | int i = (int)*pos; |
4e3c3333 | 2033 | void *ent; |
bc0c38d1 | 2034 | |
a63ce5b3 SR |
2035 | WARN_ON_ONCE(iter->leftover); |
2036 | ||
bc0c38d1 SR |
2037 | (*pos)++; |
2038 | ||
2039 | /* can't go backwards */ | |
2040 | if (iter->idx > i) | |
2041 | return NULL; | |
2042 | ||
2043 | if (iter->idx < 0) | |
955b61e5 | 2044 | ent = trace_find_next_entry_inc(iter); |
bc0c38d1 SR |
2045 | else |
2046 | ent = iter; | |
2047 | ||
2048 | while (ent && iter->idx < i) | |
955b61e5 | 2049 | ent = trace_find_next_entry_inc(iter); |
bc0c38d1 SR |
2050 | |
2051 | iter->pos = *pos; | |
2052 | ||
bc0c38d1 SR |
2053 | return ent; |
2054 | } | |
2055 | ||
955b61e5 | 2056 | void tracing_iter_reset(struct trace_iterator *iter, int cpu) |
2f26ebd5 | 2057 | { |
2f26ebd5 SR |
2058 | struct ring_buffer_event *event; |
2059 | struct ring_buffer_iter *buf_iter; | |
2060 | unsigned long entries = 0; | |
2061 | u64 ts; | |
2062 | ||
12883efb | 2063 | per_cpu_ptr(iter->trace_buffer->data, cpu)->skipped_entries = 0; |
2f26ebd5 | 2064 | |
6d158a81 SR |
2065 | buf_iter = trace_buffer_iter(iter, cpu); |
2066 | if (!buf_iter) | |
2f26ebd5 SR |
2067 | return; |
2068 | ||
2f26ebd5 SR |
2069 | ring_buffer_iter_reset(buf_iter); |
2070 | ||
2071 | /* | |
2072 | * We could have the case with the max latency tracers | |
2073 | * that a reset never took place on a cpu. This is evident | |
2074 | * by the timestamp being before the start of the buffer. | |
2075 | */ | |
2076 | while ((event = ring_buffer_iter_peek(buf_iter, &ts))) { | |
12883efb | 2077 | if (ts >= iter->trace_buffer->time_start) |
2f26ebd5 SR |
2078 | break; |
2079 | entries++; | |
2080 | ring_buffer_read(buf_iter, NULL); | |
2081 | } | |
2082 | ||
12883efb | 2083 | per_cpu_ptr(iter->trace_buffer->data, cpu)->skipped_entries = entries; |
2f26ebd5 SR |
2084 | } |
2085 | ||
d7350c3f | 2086 | /* |
d7350c3f FW |
2087 | * The current tracer is copied to avoid a global locking |
2088 | * all around. | |
2089 | */ | |
bc0c38d1 SR |
2090 | static void *s_start(struct seq_file *m, loff_t *pos) |
2091 | { | |
2092 | struct trace_iterator *iter = m->private; | |
2b6080f2 | 2093 | struct trace_array *tr = iter->tr; |
b04cc6b1 | 2094 | int cpu_file = iter->cpu_file; |
bc0c38d1 SR |
2095 | void *p = NULL; |
2096 | loff_t l = 0; | |
3928a8a2 | 2097 | int cpu; |
bc0c38d1 | 2098 | |
2fd196ec HT |
2099 | /* |
2100 | * copy the tracer to avoid using a global lock all around. | |
2101 | * iter->trace is a copy of current_trace, the pointer to the | |
2102 | * name may be used instead of a strcmp(), as iter->trace->name | |
2103 | * will point to the same string as current_trace->name. | |
2104 | */ | |
bc0c38d1 | 2105 | mutex_lock(&trace_types_lock); |
2b6080f2 SR |
2106 | if (unlikely(tr->current_trace && iter->trace->name != tr->current_trace->name)) |
2107 | *iter->trace = *tr->current_trace; | |
d7350c3f | 2108 | mutex_unlock(&trace_types_lock); |
bc0c38d1 | 2109 | |
12883efb | 2110 | #ifdef CONFIG_TRACER_MAX_TRACE |
debdd57f HT |
2111 | if (iter->snapshot && iter->trace->use_max_tr) |
2112 | return ERR_PTR(-EBUSY); | |
12883efb | 2113 | #endif |
debdd57f HT |
2114 | |
2115 | if (!iter->snapshot) | |
2116 | atomic_inc(&trace_record_cmdline_disabled); | |
bc0c38d1 | 2117 | |
bc0c38d1 SR |
2118 | if (*pos != iter->pos) { |
2119 | iter->ent = NULL; | |
2120 | iter->cpu = 0; | |
2121 | iter->idx = -1; | |
2122 | ||
ae3b5093 | 2123 | if (cpu_file == RING_BUFFER_ALL_CPUS) { |
b04cc6b1 | 2124 | for_each_tracing_cpu(cpu) |
2f26ebd5 | 2125 | tracing_iter_reset(iter, cpu); |
b04cc6b1 | 2126 | } else |
2f26ebd5 | 2127 | tracing_iter_reset(iter, cpu_file); |
bc0c38d1 | 2128 | |
ac91d854 | 2129 | iter->leftover = 0; |
bc0c38d1 SR |
2130 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) |
2131 | ; | |
2132 | ||
2133 | } else { | |
a63ce5b3 SR |
2134 | /* |
2135 | * If we overflowed the seq_file before, then we want | |
2136 | * to just reuse the trace_seq buffer again. | |
2137 | */ | |
2138 | if (iter->leftover) | |
2139 | p = iter; | |
2140 | else { | |
2141 | l = *pos - 1; | |
2142 | p = s_next(m, p, &l); | |
2143 | } | |
bc0c38d1 SR |
2144 | } |
2145 | ||
4f535968 | 2146 | trace_event_read_lock(); |
7e53bd42 | 2147 | trace_access_lock(cpu_file); |
bc0c38d1 SR |
2148 | return p; |
2149 | } | |
2150 | ||
2151 | static void s_stop(struct seq_file *m, void *p) | |
2152 | { | |
7e53bd42 LJ |
2153 | struct trace_iterator *iter = m->private; |
2154 | ||
12883efb | 2155 | #ifdef CONFIG_TRACER_MAX_TRACE |
debdd57f HT |
2156 | if (iter->snapshot && iter->trace->use_max_tr) |
2157 | return; | |
12883efb | 2158 | #endif |
debdd57f HT |
2159 | |
2160 | if (!iter->snapshot) | |
2161 | atomic_dec(&trace_record_cmdline_disabled); | |
12883efb | 2162 | |
7e53bd42 | 2163 | trace_access_unlock(iter->cpu_file); |
4f535968 | 2164 | trace_event_read_unlock(); |
bc0c38d1 SR |
2165 | } |
2166 | ||
39eaf7ef | 2167 | static void |
12883efb SRRH |
2168 | get_total_entries(struct trace_buffer *buf, |
2169 | unsigned long *total, unsigned long *entries) | |
39eaf7ef SR |
2170 | { |
2171 | unsigned long count; | |
2172 | int cpu; | |
2173 | ||
2174 | *total = 0; | |
2175 | *entries = 0; | |
2176 | ||
2177 | for_each_tracing_cpu(cpu) { | |
12883efb | 2178 | count = ring_buffer_entries_cpu(buf->buffer, cpu); |
39eaf7ef SR |
2179 | /* |
2180 | * If this buffer has skipped entries, then we hold all | |
2181 | * entries for the trace and we need to ignore the | |
2182 | * ones before the time stamp. | |
2183 | */ | |
12883efb SRRH |
2184 | if (per_cpu_ptr(buf->data, cpu)->skipped_entries) { |
2185 | count -= per_cpu_ptr(buf->data, cpu)->skipped_entries; | |
39eaf7ef SR |
2186 | /* total is the same as the entries */ |
2187 | *total += count; | |
2188 | } else | |
2189 | *total += count + | |
12883efb | 2190 | ring_buffer_overrun_cpu(buf->buffer, cpu); |
39eaf7ef SR |
2191 | *entries += count; |
2192 | } | |
2193 | } | |
2194 | ||
e309b41d | 2195 | static void print_lat_help_header(struct seq_file *m) |
bc0c38d1 | 2196 | { |
a6168353 ME |
2197 | seq_puts(m, "# _------=> CPU# \n"); |
2198 | seq_puts(m, "# / _-----=> irqs-off \n"); | |
2199 | seq_puts(m, "# | / _----=> need-resched \n"); | |
2200 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); | |
2201 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); | |
e6e1e259 SR |
2202 | seq_puts(m, "# |||| / delay \n"); |
2203 | seq_puts(m, "# cmd pid ||||| time | caller \n"); | |
2204 | seq_puts(m, "# \\ / ||||| \\ | / \n"); | |
bc0c38d1 SR |
2205 | } |
2206 | ||
12883efb | 2207 | static void print_event_info(struct trace_buffer *buf, struct seq_file *m) |
bc0c38d1 | 2208 | { |
39eaf7ef SR |
2209 | unsigned long total; |
2210 | unsigned long entries; | |
2211 | ||
12883efb | 2212 | get_total_entries(buf, &total, &entries); |
39eaf7ef SR |
2213 | seq_printf(m, "# entries-in-buffer/entries-written: %lu/%lu #P:%d\n", |
2214 | entries, total, num_online_cpus()); | |
2215 | seq_puts(m, "#\n"); | |
2216 | } | |
2217 | ||
12883efb | 2218 | static void print_func_help_header(struct trace_buffer *buf, struct seq_file *m) |
39eaf7ef | 2219 | { |
12883efb | 2220 | print_event_info(buf, m); |
77271ce4 | 2221 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); |
a6168353 | 2222 | seq_puts(m, "# | | | | |\n"); |
bc0c38d1 SR |
2223 | } |
2224 | ||
12883efb | 2225 | static void print_func_help_header_irq(struct trace_buffer *buf, struct seq_file *m) |
77271ce4 | 2226 | { |
12883efb | 2227 | print_event_info(buf, m); |
77271ce4 SR |
2228 | seq_puts(m, "# _-----=> irqs-off\n"); |
2229 | seq_puts(m, "# / _----=> need-resched\n"); | |
2230 | seq_puts(m, "# | / _---=> hardirq/softirq\n"); | |
2231 | seq_puts(m, "# || / _--=> preempt-depth\n"); | |
2232 | seq_puts(m, "# ||| / delay\n"); | |
2233 | seq_puts(m, "# TASK-PID CPU# |||| TIMESTAMP FUNCTION\n"); | |
2234 | seq_puts(m, "# | | | |||| | |\n"); | |
2235 | } | |
bc0c38d1 | 2236 | |
62b915f1 | 2237 | void |
bc0c38d1 SR |
2238 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
2239 | { | |
2240 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); | |
12883efb SRRH |
2241 | struct trace_buffer *buf = iter->trace_buffer; |
2242 | struct trace_array_cpu *data = per_cpu_ptr(buf->data, buf->cpu); | |
2b6080f2 | 2243 | struct tracer *type = iter->trace; |
39eaf7ef SR |
2244 | unsigned long entries; |
2245 | unsigned long total; | |
bc0c38d1 SR |
2246 | const char *name = "preemption"; |
2247 | ||
d840f718 | 2248 | name = type->name; |
bc0c38d1 | 2249 | |
12883efb | 2250 | get_total_entries(buf, &total, &entries); |
bc0c38d1 | 2251 | |
888b55dc | 2252 | seq_printf(m, "# %s latency trace v1.1.5 on %s\n", |
bc0c38d1 | 2253 | name, UTS_RELEASE); |
888b55dc | 2254 | seq_puts(m, "# -----------------------------------" |
bc0c38d1 | 2255 | "---------------------------------\n"); |
888b55dc | 2256 | seq_printf(m, "# latency: %lu us, #%lu/%lu, CPU#%d |" |
bc0c38d1 | 2257 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", |
57f50be1 | 2258 | nsecs_to_usecs(data->saved_latency), |
bc0c38d1 | 2259 | entries, |
4c11d7ae | 2260 | total, |
12883efb | 2261 | buf->cpu, |
bc0c38d1 SR |
2262 | #if defined(CONFIG_PREEMPT_NONE) |
2263 | "server", | |
2264 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) | |
2265 | "desktop", | |
b5c21b45 | 2266 | #elif defined(CONFIG_PREEMPT) |
bc0c38d1 SR |
2267 | "preempt", |
2268 | #else | |
2269 | "unknown", | |
2270 | #endif | |
2271 | /* These are reserved for later use */ | |
2272 | 0, 0, 0, 0); | |
2273 | #ifdef CONFIG_SMP | |
2274 | seq_printf(m, " #P:%d)\n", num_online_cpus()); | |
2275 | #else | |
2276 | seq_puts(m, ")\n"); | |
2277 | #endif | |
888b55dc KM |
2278 | seq_puts(m, "# -----------------\n"); |
2279 | seq_printf(m, "# | task: %.16s-%d " | |
bc0c38d1 | 2280 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", |
d20b92ab EB |
2281 | data->comm, data->pid, |
2282 | from_kuid_munged(seq_user_ns(m), data->uid), data->nice, | |
bc0c38d1 | 2283 | data->policy, data->rt_priority); |
888b55dc | 2284 | seq_puts(m, "# -----------------\n"); |
bc0c38d1 SR |
2285 | |
2286 | if (data->critical_start) { | |
888b55dc | 2287 | seq_puts(m, "# => started at: "); |
214023c3 SR |
2288 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
2289 | trace_print_seq(m, &iter->seq); | |
888b55dc | 2290 | seq_puts(m, "\n# => ended at: "); |
214023c3 SR |
2291 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
2292 | trace_print_seq(m, &iter->seq); | |
8248ac05 | 2293 | seq_puts(m, "\n#\n"); |
bc0c38d1 SR |
2294 | } |
2295 | ||
888b55dc | 2296 | seq_puts(m, "#\n"); |
bc0c38d1 SR |
2297 | } |
2298 | ||
a309720c SR |
2299 | static void test_cpu_buff_start(struct trace_iterator *iter) |
2300 | { | |
2301 | struct trace_seq *s = &iter->seq; | |
2302 | ||
12ef7d44 SR |
2303 | if (!(trace_flags & TRACE_ITER_ANNOTATE)) |
2304 | return; | |
2305 | ||
2306 | if (!(iter->iter_flags & TRACE_FILE_ANNOTATE)) | |
2307 | return; | |
2308 | ||
4462344e | 2309 | if (cpumask_test_cpu(iter->cpu, iter->started)) |
a309720c SR |
2310 | return; |
2311 | ||
12883efb | 2312 | if (per_cpu_ptr(iter->trace_buffer->data, iter->cpu)->skipped_entries) |
2f26ebd5 SR |
2313 | return; |
2314 | ||
4462344e | 2315 | cpumask_set_cpu(iter->cpu, iter->started); |
b0dfa978 FW |
2316 | |
2317 | /* Don't print started cpu buffer for the first entry of the trace */ | |
2318 | if (iter->idx > 1) | |
2319 | trace_seq_printf(s, "##### CPU %u buffer started ####\n", | |
2320 | iter->cpu); | |
a309720c SR |
2321 | } |
2322 | ||
2c4f035f | 2323 | static enum print_line_t print_trace_fmt(struct trace_iterator *iter) |
bc0c38d1 | 2324 | { |
214023c3 | 2325 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 2326 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
4e3c3333 | 2327 | struct trace_entry *entry; |
f633cef0 | 2328 | struct trace_event *event; |
bc0c38d1 | 2329 | |
4e3c3333 | 2330 | entry = iter->ent; |
dd0e545f | 2331 | |
a309720c SR |
2332 | test_cpu_buff_start(iter); |
2333 | ||
c4a8e8be | 2334 | event = ftrace_find_event(entry->type); |
bc0c38d1 | 2335 | |
c4a8e8be | 2336 | if (trace_flags & TRACE_ITER_CONTEXT_INFO) { |
27d48be8 SR |
2337 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { |
2338 | if (!trace_print_lat_context(iter)) | |
2339 | goto partial; | |
2340 | } else { | |
2341 | if (!trace_print_context(iter)) | |
2342 | goto partial; | |
2343 | } | |
c4a8e8be | 2344 | } |
bc0c38d1 | 2345 | |
268ccda0 | 2346 | if (event) |
a9a57763 | 2347 | return event->funcs->trace(iter, sym_flags, event); |
d9793bd8 ACM |
2348 | |
2349 | if (!trace_seq_printf(s, "Unknown type %d\n", entry->type)) | |
2350 | goto partial; | |
02b67518 | 2351 | |
2c4f035f | 2352 | return TRACE_TYPE_HANDLED; |
d9793bd8 ACM |
2353 | partial: |
2354 | return TRACE_TYPE_PARTIAL_LINE; | |
bc0c38d1 SR |
2355 | } |
2356 | ||
2c4f035f | 2357 | static enum print_line_t print_raw_fmt(struct trace_iterator *iter) |
f9896bf3 IM |
2358 | { |
2359 | struct trace_seq *s = &iter->seq; | |
2360 | struct trace_entry *entry; | |
f633cef0 | 2361 | struct trace_event *event; |
f9896bf3 IM |
2362 | |
2363 | entry = iter->ent; | |
dd0e545f | 2364 | |
c4a8e8be | 2365 | if (trace_flags & TRACE_ITER_CONTEXT_INFO) { |
d9793bd8 ACM |
2366 | if (!trace_seq_printf(s, "%d %d %llu ", |
2367 | entry->pid, iter->cpu, iter->ts)) | |
2368 | goto partial; | |
c4a8e8be | 2369 | } |
f9896bf3 | 2370 | |
f633cef0 | 2371 | event = ftrace_find_event(entry->type); |
268ccda0 | 2372 | if (event) |
a9a57763 | 2373 | return event->funcs->raw(iter, 0, event); |
d9793bd8 ACM |
2374 | |
2375 | if (!trace_seq_printf(s, "%d ?\n", entry->type)) | |
2376 | goto partial; | |
777e208d | 2377 | |
2c4f035f | 2378 | return TRACE_TYPE_HANDLED; |
d9793bd8 ACM |
2379 | partial: |
2380 | return TRACE_TYPE_PARTIAL_LINE; | |
f9896bf3 IM |
2381 | } |
2382 | ||
2c4f035f | 2383 | static enum print_line_t print_hex_fmt(struct trace_iterator *iter) |
5e3ca0ec IM |
2384 | { |
2385 | struct trace_seq *s = &iter->seq; | |
2386 | unsigned char newline = '\n'; | |
2387 | struct trace_entry *entry; | |
f633cef0 | 2388 | struct trace_event *event; |
5e3ca0ec IM |
2389 | |
2390 | entry = iter->ent; | |
dd0e545f | 2391 | |
c4a8e8be FW |
2392 | if (trace_flags & TRACE_ITER_CONTEXT_INFO) { |
2393 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); | |
2394 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); | |
2395 | SEQ_PUT_HEX_FIELD_RET(s, iter->ts); | |
2396 | } | |
5e3ca0ec | 2397 | |
f633cef0 | 2398 | event = ftrace_find_event(entry->type); |
268ccda0 | 2399 | if (event) { |
a9a57763 | 2400 | enum print_line_t ret = event->funcs->hex(iter, 0, event); |
d9793bd8 ACM |
2401 | if (ret != TRACE_TYPE_HANDLED) |
2402 | return ret; | |
2403 | } | |
7104f300 | 2404 | |
5e3ca0ec IM |
2405 | SEQ_PUT_FIELD_RET(s, newline); |
2406 | ||
2c4f035f | 2407 | return TRACE_TYPE_HANDLED; |
5e3ca0ec IM |
2408 | } |
2409 | ||
2c4f035f | 2410 | static enum print_line_t print_bin_fmt(struct trace_iterator *iter) |
cb0f12aa IM |
2411 | { |
2412 | struct trace_seq *s = &iter->seq; | |
2413 | struct trace_entry *entry; | |
f633cef0 | 2414 | struct trace_event *event; |
cb0f12aa IM |
2415 | |
2416 | entry = iter->ent; | |
dd0e545f | 2417 | |
c4a8e8be FW |
2418 | if (trace_flags & TRACE_ITER_CONTEXT_INFO) { |
2419 | SEQ_PUT_FIELD_RET(s, entry->pid); | |
1830b52d | 2420 | SEQ_PUT_FIELD_RET(s, iter->cpu); |
c4a8e8be FW |
2421 | SEQ_PUT_FIELD_RET(s, iter->ts); |
2422 | } | |
cb0f12aa | 2423 | |
f633cef0 | 2424 | event = ftrace_find_event(entry->type); |
a9a57763 SR |
2425 | return event ? event->funcs->binary(iter, 0, event) : |
2426 | TRACE_TYPE_HANDLED; | |
cb0f12aa IM |
2427 | } |
2428 | ||
62b915f1 | 2429 | int trace_empty(struct trace_iterator *iter) |
bc0c38d1 | 2430 | { |
6d158a81 | 2431 | struct ring_buffer_iter *buf_iter; |
bc0c38d1 SR |
2432 | int cpu; |
2433 | ||
9aba60fe | 2434 | /* If we are looking at one CPU buffer, only check that one */ |
ae3b5093 | 2435 | if (iter->cpu_file != RING_BUFFER_ALL_CPUS) { |
9aba60fe | 2436 | cpu = iter->cpu_file; |
6d158a81 SR |
2437 | buf_iter = trace_buffer_iter(iter, cpu); |
2438 | if (buf_iter) { | |
2439 | if (!ring_buffer_iter_empty(buf_iter)) | |
9aba60fe SR |
2440 | return 0; |
2441 | } else { | |
12883efb | 2442 | if (!ring_buffer_empty_cpu(iter->trace_buffer->buffer, cpu)) |
9aba60fe SR |
2443 | return 0; |
2444 | } | |
2445 | return 1; | |
2446 | } | |
2447 | ||
ab46428c | 2448 | for_each_tracing_cpu(cpu) { |
6d158a81 SR |
2449 | buf_iter = trace_buffer_iter(iter, cpu); |
2450 | if (buf_iter) { | |
2451 | if (!ring_buffer_iter_empty(buf_iter)) | |
d769041f SR |
2452 | return 0; |
2453 | } else { | |
12883efb | 2454 | if (!ring_buffer_empty_cpu(iter->trace_buffer->buffer, cpu)) |
d769041f SR |
2455 | return 0; |
2456 | } | |
bc0c38d1 | 2457 | } |
d769041f | 2458 | |
797d3712 | 2459 | return 1; |
bc0c38d1 SR |
2460 | } |
2461 | ||
4f535968 | 2462 | /* Called with trace_event_read_lock() held. */ |
955b61e5 | 2463 | enum print_line_t print_trace_line(struct trace_iterator *iter) |
f9896bf3 | 2464 | { |
2c4f035f FW |
2465 | enum print_line_t ret; |
2466 | ||
ee5e51f5 JO |
2467 | if (iter->lost_events && |
2468 | !trace_seq_printf(&iter->seq, "CPU:%d [LOST %lu EVENTS]\n", | |
2469 | iter->cpu, iter->lost_events)) | |
2470 | return TRACE_TYPE_PARTIAL_LINE; | |
bc21b478 | 2471 | |
2c4f035f FW |
2472 | if (iter->trace && iter->trace->print_line) { |
2473 | ret = iter->trace->print_line(iter); | |
2474 | if (ret != TRACE_TYPE_UNHANDLED) | |
2475 | return ret; | |
2476 | } | |
72829bc3 | 2477 | |
48ead020 FW |
2478 | if (iter->ent->type == TRACE_BPRINT && |
2479 | trace_flags & TRACE_ITER_PRINTK && | |
2480 | trace_flags & TRACE_ITER_PRINTK_MSGONLY) | |
5ef841f6 | 2481 | return trace_print_bprintk_msg_only(iter); |
48ead020 | 2482 | |
66896a85 FW |
2483 | if (iter->ent->type == TRACE_PRINT && |
2484 | trace_flags & TRACE_ITER_PRINTK && | |
2485 | trace_flags & TRACE_ITER_PRINTK_MSGONLY) | |
5ef841f6 | 2486 | return trace_print_printk_msg_only(iter); |
66896a85 | 2487 | |
cb0f12aa IM |
2488 | if (trace_flags & TRACE_ITER_BIN) |
2489 | return print_bin_fmt(iter); | |
2490 | ||
5e3ca0ec IM |
2491 | if (trace_flags & TRACE_ITER_HEX) |
2492 | return print_hex_fmt(iter); | |
2493 | ||
f9896bf3 IM |
2494 | if (trace_flags & TRACE_ITER_RAW) |
2495 | return print_raw_fmt(iter); | |
2496 | ||
f9896bf3 IM |
2497 | return print_trace_fmt(iter); |
2498 | } | |
2499 | ||
7e9a49ef JO |
2500 | void trace_latency_header(struct seq_file *m) |
2501 | { | |
2502 | struct trace_iterator *iter = m->private; | |
2503 | ||
2504 | /* print nothing if the buffers are empty */ | |
2505 | if (trace_empty(iter)) | |
2506 | return; | |
2507 | ||
2508 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) | |
2509 | print_trace_header(m, iter); | |
2510 | ||
2511 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
2512 | print_lat_help_header(m); | |
2513 | } | |
2514 | ||
62b915f1 JO |
2515 | void trace_default_header(struct seq_file *m) |
2516 | { | |
2517 | struct trace_iterator *iter = m->private; | |
2518 | ||
f56e7f8e JO |
2519 | if (!(trace_flags & TRACE_ITER_CONTEXT_INFO)) |
2520 | return; | |
2521 | ||
62b915f1 JO |
2522 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { |
2523 | /* print nothing if the buffers are empty */ | |
2524 | if (trace_empty(iter)) | |
2525 | return; | |
2526 | print_trace_header(m, iter); | |
2527 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
2528 | print_lat_help_header(m); | |
2529 | } else { | |
77271ce4 SR |
2530 | if (!(trace_flags & TRACE_ITER_VERBOSE)) { |
2531 | if (trace_flags & TRACE_ITER_IRQ_INFO) | |
12883efb | 2532 | print_func_help_header_irq(iter->trace_buffer, m); |
77271ce4 | 2533 | else |
12883efb | 2534 | print_func_help_header(iter->trace_buffer, m); |
77271ce4 | 2535 | } |
62b915f1 JO |
2536 | } |
2537 | } | |
2538 | ||
e0a413f6 SR |
2539 | static void test_ftrace_alive(struct seq_file *m) |
2540 | { | |
2541 | if (!ftrace_is_dead()) | |
2542 | return; | |
2543 | seq_printf(m, "# WARNING: FUNCTION TRACING IS CORRUPTED\n"); | |
2544 | seq_printf(m, "# MAY BE MISSING FUNCTION EVENTS\n"); | |
2545 | } | |
2546 | ||
d8741e2e | 2547 | #ifdef CONFIG_TRACER_MAX_TRACE |
f1affcaa SRRH |
2548 | static void show_snapshot_main_help(struct seq_file *m) |
2549 | { | |
2550 | seq_printf(m, "# echo 0 > snapshot : Clears and frees snapshot buffer\n"); | |
2551 | seq_printf(m, "# echo 1 > snapshot : Allocates snapshot buffer, if not already allocated.\n"); | |
2552 | seq_printf(m, "# Takes a snapshot of the main buffer.\n"); | |
2553 | seq_printf(m, "# echo 2 > snapshot : Clears snapshot buffer (but does not allocate)\n"); | |
2554 | seq_printf(m, "# (Doesn't have to be '2' works with any number that\n"); | |
2555 | seq_printf(m, "# is not a '0' or '1')\n"); | |
2556 | } | |
2557 | ||
2558 | static void show_snapshot_percpu_help(struct seq_file *m) | |
2559 | { | |
2560 | seq_printf(m, "# echo 0 > snapshot : Invalid for per_cpu snapshot file.\n"); | |
2561 | #ifdef CONFIG_RING_BUFFER_ALLOW_SWAP | |
2562 | seq_printf(m, "# echo 1 > snapshot : Allocates snapshot buffer, if not already allocated.\n"); | |
2563 | seq_printf(m, "# Takes a snapshot of the main buffer for this cpu.\n"); | |
2564 | #else | |
2565 | seq_printf(m, "# echo 1 > snapshot : Not supported with this kernel.\n"); | |
2566 | seq_printf(m, "# Must use main snapshot file to allocate.\n"); | |
2567 | #endif | |
2568 | seq_printf(m, "# echo 2 > snapshot : Clears this cpu's snapshot buffer (but does not allocate)\n"); | |
2569 | seq_printf(m, "# (Doesn't have to be '2' works with any number that\n"); | |
2570 | seq_printf(m, "# is not a '0' or '1')\n"); | |
2571 | } | |
2572 | ||
d8741e2e SRRH |
2573 | static void print_snapshot_help(struct seq_file *m, struct trace_iterator *iter) |
2574 | { | |
45ad21ca | 2575 | if (iter->tr->allocated_snapshot) |
d8741e2e SRRH |
2576 | seq_printf(m, "#\n# * Snapshot is allocated *\n#\n"); |
2577 | else | |
2578 | seq_printf(m, "#\n# * Snapshot is freed *\n#\n"); | |
2579 | ||
2580 | seq_printf(m, "# Snapshot commands:\n"); | |
f1affcaa SRRH |
2581 | if (iter->cpu_file == RING_BUFFER_ALL_CPUS) |
2582 | show_snapshot_main_help(m); | |
2583 | else | |
2584 | show_snapshot_percpu_help(m); | |
d8741e2e SRRH |
2585 | } |
2586 | #else | |
2587 | /* Should never be called */ | |
2588 | static inline void print_snapshot_help(struct seq_file *m, struct trace_iterator *iter) { } | |
2589 | #endif | |
2590 | ||
bc0c38d1 SR |
2591 | static int s_show(struct seq_file *m, void *v) |
2592 | { | |
2593 | struct trace_iterator *iter = v; | |
a63ce5b3 | 2594 | int ret; |
bc0c38d1 SR |
2595 | |
2596 | if (iter->ent == NULL) { | |
2597 | if (iter->tr) { | |
2598 | seq_printf(m, "# tracer: %s\n", iter->trace->name); | |
2599 | seq_puts(m, "#\n"); | |
e0a413f6 | 2600 | test_ftrace_alive(m); |
bc0c38d1 | 2601 | } |
d8741e2e SRRH |
2602 | if (iter->snapshot && trace_empty(iter)) |
2603 | print_snapshot_help(m, iter); | |
2604 | else if (iter->trace && iter->trace->print_header) | |
8bba1bf5 | 2605 | iter->trace->print_header(m); |
62b915f1 JO |
2606 | else |
2607 | trace_default_header(m); | |
2608 | ||
a63ce5b3 SR |
2609 | } else if (iter->leftover) { |
2610 | /* | |
2611 | * If we filled the seq_file buffer earlier, we | |
2612 | * want to just show it now. | |
2613 | */ | |
2614 | ret = trace_print_seq(m, &iter->seq); | |
2615 | ||
2616 | /* ret should this time be zero, but you never know */ | |
2617 | iter->leftover = ret; | |
2618 | ||
bc0c38d1 | 2619 | } else { |
f9896bf3 | 2620 | print_trace_line(iter); |
a63ce5b3 SR |
2621 | ret = trace_print_seq(m, &iter->seq); |
2622 | /* | |
2623 | * If we overflow the seq_file buffer, then it will | |
2624 | * ask us for this data again at start up. | |
2625 | * Use that instead. | |
2626 | * ret is 0 if seq_file write succeeded. | |
2627 | * -1 otherwise. | |
2628 | */ | |
2629 | iter->leftover = ret; | |
bc0c38d1 SR |
2630 | } |
2631 | ||
2632 | return 0; | |
2633 | } | |
2634 | ||
88e9d34c | 2635 | static const struct seq_operations tracer_seq_ops = { |
4bf39a94 IM |
2636 | .start = s_start, |
2637 | .next = s_next, | |
2638 | .stop = s_stop, | |
2639 | .show = s_show, | |
bc0c38d1 SR |
2640 | }; |
2641 | ||
e309b41d | 2642 | static struct trace_iterator * |
debdd57f | 2643 | __tracing_open(struct inode *inode, struct file *file, bool snapshot) |
bc0c38d1 | 2644 | { |
2b6080f2 SR |
2645 | struct trace_cpu *tc = inode->i_private; |
2646 | struct trace_array *tr = tc->tr; | |
bc0c38d1 | 2647 | struct trace_iterator *iter; |
50e18b94 | 2648 | int cpu; |
bc0c38d1 | 2649 | |
85a2f9b4 SR |
2650 | if (tracing_disabled) |
2651 | return ERR_PTR(-ENODEV); | |
60a11774 | 2652 | |
50e18b94 | 2653 | iter = __seq_open_private(file, &tracer_seq_ops, sizeof(*iter)); |
85a2f9b4 SR |
2654 | if (!iter) |
2655 | return ERR_PTR(-ENOMEM); | |
bc0c38d1 | 2656 | |
6d158a81 SR |
2657 | iter->buffer_iter = kzalloc(sizeof(*iter->buffer_iter) * num_possible_cpus(), |
2658 | GFP_KERNEL); | |
93574fcc DC |
2659 | if (!iter->buffer_iter) |
2660 | goto release; | |
2661 | ||
d7350c3f FW |
2662 | /* |
2663 | * We make a copy of the current tracer to avoid concurrent | |
2664 | * changes on it while we are reading. | |
2665 | */ | |
bc0c38d1 | 2666 | mutex_lock(&trace_types_lock); |
d7350c3f | 2667 | iter->trace = kzalloc(sizeof(*iter->trace), GFP_KERNEL); |
85a2f9b4 | 2668 | if (!iter->trace) |
d7350c3f | 2669 | goto fail; |
85a2f9b4 | 2670 | |
2b6080f2 | 2671 | *iter->trace = *tr->current_trace; |
d7350c3f | 2672 | |
79f55997 | 2673 | if (!zalloc_cpumask_var(&iter->started, GFP_KERNEL)) |
b0dfa978 FW |
2674 | goto fail; |
2675 | ||
12883efb SRRH |
2676 | iter->tr = tr; |
2677 | ||
2678 | #ifdef CONFIG_TRACER_MAX_TRACE | |
2b6080f2 SR |
2679 | /* Currently only the top directory has a snapshot */ |
2680 | if (tr->current_trace->print_max || snapshot) | |
12883efb | 2681 | iter->trace_buffer = &tr->max_buffer; |
bc0c38d1 | 2682 | else |
12883efb SRRH |
2683 | #endif |
2684 | iter->trace_buffer = &tr->trace_buffer; | |
debdd57f | 2685 | iter->snapshot = snapshot; |
bc0c38d1 | 2686 | iter->pos = -1; |
d7350c3f | 2687 | mutex_init(&iter->mutex); |
2b6080f2 | 2688 | iter->cpu_file = tc->cpu; |
bc0c38d1 | 2689 | |
8bba1bf5 MM |
2690 | /* Notify the tracer early; before we stop tracing. */ |
2691 | if (iter->trace && iter->trace->open) | |
a93751ca | 2692 | iter->trace->open(iter); |
8bba1bf5 | 2693 | |
12ef7d44 | 2694 | /* Annotate start of buffers if we had overruns */ |
12883efb | 2695 | if (ring_buffer_overruns(iter->trace_buffer->buffer)) |
12ef7d44 SR |
2696 | iter->iter_flags |= TRACE_FILE_ANNOTATE; |
2697 | ||
8be0709f DS |
2698 | /* Output in nanoseconds only if we are using a clock in nanoseconds. */ |
2699 | if (trace_clocks[trace_clock_id].in_ns) | |
2700 | iter->iter_flags |= TRACE_FILE_TIME_IN_NS; | |
2701 | ||
debdd57f HT |
2702 | /* stop the trace while dumping if we are not opening "snapshot" */ |
2703 | if (!iter->snapshot) | |
2b6080f2 | 2704 | tracing_stop_tr(tr); |
2f26ebd5 | 2705 | |
ae3b5093 | 2706 | if (iter->cpu_file == RING_BUFFER_ALL_CPUS) { |
b04cc6b1 | 2707 | for_each_tracing_cpu(cpu) { |
b04cc6b1 | 2708 | iter->buffer_iter[cpu] = |
12883efb | 2709 | ring_buffer_read_prepare(iter->trace_buffer->buffer, cpu); |
72c9ddfd DM |
2710 | } |
2711 | ring_buffer_read_prepare_sync(); | |
2712 | for_each_tracing_cpu(cpu) { | |
2713 | ring_buffer_read_start(iter->buffer_iter[cpu]); | |
2f26ebd5 | 2714 | tracing_iter_reset(iter, cpu); |
b04cc6b1 FW |
2715 | } |
2716 | } else { | |
2717 | cpu = iter->cpu_file; | |
3928a8a2 | 2718 | iter->buffer_iter[cpu] = |
12883efb | 2719 | ring_buffer_read_prepare(iter->trace_buffer->buffer, cpu); |
72c9ddfd DM |
2720 | ring_buffer_read_prepare_sync(); |
2721 | ring_buffer_read_start(iter->buffer_iter[cpu]); | |
2f26ebd5 | 2722 | tracing_iter_reset(iter, cpu); |
3928a8a2 SR |
2723 | } |
2724 | ||
a695cb58 SRRH |
2725 | tr->ref++; |
2726 | ||
bc0c38d1 SR |
2727 | mutex_unlock(&trace_types_lock); |
2728 | ||
bc0c38d1 | 2729 | return iter; |
3928a8a2 | 2730 | |
d7350c3f | 2731 | fail: |
3928a8a2 | 2732 | mutex_unlock(&trace_types_lock); |
d7350c3f | 2733 | kfree(iter->trace); |
6d158a81 | 2734 | kfree(iter->buffer_iter); |
93574fcc | 2735 | release: |
50e18b94 JO |
2736 | seq_release_private(inode, file); |
2737 | return ERR_PTR(-ENOMEM); | |
bc0c38d1 SR |
2738 | } |
2739 | ||
2740 | int tracing_open_generic(struct inode *inode, struct file *filp) | |
2741 | { | |
60a11774 SR |
2742 | if (tracing_disabled) |
2743 | return -ENODEV; | |
2744 | ||
bc0c38d1 SR |
2745 | filp->private_data = inode->i_private; |
2746 | return 0; | |
2747 | } | |
2748 | ||
4fd27358 | 2749 | static int tracing_release(struct inode *inode, struct file *file) |
bc0c38d1 | 2750 | { |
907f2784 | 2751 | struct seq_file *m = file->private_data; |
4acd4d00 | 2752 | struct trace_iterator *iter; |
2b6080f2 | 2753 | struct trace_array *tr; |
3928a8a2 | 2754 | int cpu; |
bc0c38d1 | 2755 | |
4acd4d00 SR |
2756 | if (!(file->f_mode & FMODE_READ)) |
2757 | return 0; | |
2758 | ||
2759 | iter = m->private; | |
12883efb | 2760 | tr = iter->tr; |
2b6080f2 | 2761 | |
bc0c38d1 | 2762 | mutex_lock(&trace_types_lock); |
a695cb58 SRRH |
2763 | |
2764 | WARN_ON(!tr->ref); | |
2765 | tr->ref--; | |
2766 | ||
3928a8a2 SR |
2767 | for_each_tracing_cpu(cpu) { |
2768 | if (iter->buffer_iter[cpu]) | |
2769 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
2770 | } | |
2771 | ||
bc0c38d1 SR |
2772 | if (iter->trace && iter->trace->close) |
2773 | iter->trace->close(iter); | |
2774 | ||
debdd57f HT |
2775 | if (!iter->snapshot) |
2776 | /* reenable tracing if it was previously enabled */ | |
2b6080f2 | 2777 | tracing_start_tr(tr); |
bc0c38d1 SR |
2778 | mutex_unlock(&trace_types_lock); |
2779 | ||
d7350c3f | 2780 | mutex_destroy(&iter->mutex); |
b0dfa978 | 2781 | free_cpumask_var(iter->started); |
d7350c3f | 2782 | kfree(iter->trace); |
6d158a81 | 2783 | kfree(iter->buffer_iter); |
50e18b94 | 2784 | seq_release_private(inode, file); |
bc0c38d1 SR |
2785 | return 0; |
2786 | } | |
2787 | ||
2788 | static int tracing_open(struct inode *inode, struct file *file) | |
2789 | { | |
85a2f9b4 SR |
2790 | struct trace_iterator *iter; |
2791 | int ret = 0; | |
bc0c38d1 | 2792 | |
4acd4d00 SR |
2793 | /* If this file was open for write, then erase contents */ |
2794 | if ((file->f_mode & FMODE_WRITE) && | |
8650ae32 | 2795 | (file->f_flags & O_TRUNC)) { |
2b6080f2 SR |
2796 | struct trace_cpu *tc = inode->i_private; |
2797 | struct trace_array *tr = tc->tr; | |
bc0c38d1 | 2798 | |
2b6080f2 | 2799 | if (tc->cpu == RING_BUFFER_ALL_CPUS) |
12883efb | 2800 | tracing_reset_online_cpus(&tr->trace_buffer); |
4acd4d00 | 2801 | else |
12883efb | 2802 | tracing_reset(&tr->trace_buffer, tc->cpu); |
4acd4d00 | 2803 | } |
bc0c38d1 | 2804 | |
4acd4d00 | 2805 | if (file->f_mode & FMODE_READ) { |
debdd57f | 2806 | iter = __tracing_open(inode, file, false); |
4acd4d00 SR |
2807 | if (IS_ERR(iter)) |
2808 | ret = PTR_ERR(iter); | |
2809 | else if (trace_flags & TRACE_ITER_LATENCY_FMT) | |
2810 | iter->iter_flags |= TRACE_FILE_LAT_FMT; | |
2811 | } | |
bc0c38d1 SR |
2812 | return ret; |
2813 | } | |
2814 | ||
e309b41d | 2815 | static void * |
bc0c38d1 SR |
2816 | t_next(struct seq_file *m, void *v, loff_t *pos) |
2817 | { | |
f129e965 | 2818 | struct tracer *t = v; |
bc0c38d1 SR |
2819 | |
2820 | (*pos)++; | |
2821 | ||
2822 | if (t) | |
2823 | t = t->next; | |
2824 | ||
bc0c38d1 SR |
2825 | return t; |
2826 | } | |
2827 | ||
2828 | static void *t_start(struct seq_file *m, loff_t *pos) | |
2829 | { | |
f129e965 | 2830 | struct tracer *t; |
bc0c38d1 SR |
2831 | loff_t l = 0; |
2832 | ||
2833 | mutex_lock(&trace_types_lock); | |
f129e965 | 2834 | for (t = trace_types; t && l < *pos; t = t_next(m, t, &l)) |
bc0c38d1 SR |
2835 | ; |
2836 | ||
2837 | return t; | |
2838 | } | |
2839 | ||
2840 | static void t_stop(struct seq_file *m, void *p) | |
2841 | { | |
2842 | mutex_unlock(&trace_types_lock); | |
2843 | } | |
2844 | ||
2845 | static int t_show(struct seq_file *m, void *v) | |
2846 | { | |
2847 | struct tracer *t = v; | |
2848 | ||
2849 | if (!t) | |
2850 | return 0; | |
2851 | ||
2852 | seq_printf(m, "%s", t->name); | |
2853 | if (t->next) | |
2854 | seq_putc(m, ' '); | |
2855 | else | |
2856 | seq_putc(m, '\n'); | |
2857 | ||
2858 | return 0; | |
2859 | } | |
2860 | ||
88e9d34c | 2861 | static const struct seq_operations show_traces_seq_ops = { |
4bf39a94 IM |
2862 | .start = t_start, |
2863 | .next = t_next, | |
2864 | .stop = t_stop, | |
2865 | .show = t_show, | |
bc0c38d1 SR |
2866 | }; |
2867 | ||
2868 | static int show_traces_open(struct inode *inode, struct file *file) | |
2869 | { | |
60a11774 SR |
2870 | if (tracing_disabled) |
2871 | return -ENODEV; | |
2872 | ||
f129e965 | 2873 | return seq_open(file, &show_traces_seq_ops); |
bc0c38d1 SR |
2874 | } |
2875 | ||
4acd4d00 SR |
2876 | static ssize_t |
2877 | tracing_write_stub(struct file *filp, const char __user *ubuf, | |
2878 | size_t count, loff_t *ppos) | |
2879 | { | |
2880 | return count; | |
2881 | } | |
2882 | ||
364829b1 SP |
2883 | static loff_t tracing_seek(struct file *file, loff_t offset, int origin) |
2884 | { | |
2885 | if (file->f_mode & FMODE_READ) | |
2886 | return seq_lseek(file, offset, origin); | |
2887 | else | |
2888 | return 0; | |
2889 | } | |
2890 | ||
5e2336a0 | 2891 | static const struct file_operations tracing_fops = { |
4bf39a94 IM |
2892 | .open = tracing_open, |
2893 | .read = seq_read, | |
4acd4d00 | 2894 | .write = tracing_write_stub, |
364829b1 | 2895 | .llseek = tracing_seek, |
4bf39a94 | 2896 | .release = tracing_release, |
bc0c38d1 SR |
2897 | }; |
2898 | ||
5e2336a0 | 2899 | static const struct file_operations show_traces_fops = { |
c7078de1 IM |
2900 | .open = show_traces_open, |
2901 | .read = seq_read, | |
2902 | .release = seq_release, | |
b444786f | 2903 | .llseek = seq_lseek, |
c7078de1 IM |
2904 | }; |
2905 | ||
36dfe925 IM |
2906 | /* |
2907 | * Only trace on a CPU if the bitmask is set: | |
2908 | */ | |
9e01c1b7 | 2909 | static cpumask_var_t tracing_cpumask; |
36dfe925 IM |
2910 | |
2911 | /* | |
2912 | * The tracer itself will not take this lock, but still we want | |
2913 | * to provide a consistent cpumask to user-space: | |
2914 | */ | |
2915 | static DEFINE_MUTEX(tracing_cpumask_update_lock); | |
2916 | ||
2917 | /* | |
2918 | * Temporary storage for the character representation of the | |
2919 | * CPU bitmask (and one more byte for the newline): | |
2920 | */ | |
2921 | static char mask_str[NR_CPUS + 1]; | |
2922 | ||
c7078de1 IM |
2923 | static ssize_t |
2924 | tracing_cpumask_read(struct file *filp, char __user *ubuf, | |
2925 | size_t count, loff_t *ppos) | |
2926 | { | |
36dfe925 | 2927 | int len; |
c7078de1 IM |
2928 | |
2929 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 | 2930 | |
9e01c1b7 | 2931 | len = cpumask_scnprintf(mask_str, count, tracing_cpumask); |
36dfe925 IM |
2932 | if (count - len < 2) { |
2933 | count = -EINVAL; | |
2934 | goto out_err; | |
2935 | } | |
2936 | len += sprintf(mask_str + len, "\n"); | |
2937 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); | |
2938 | ||
2939 | out_err: | |
c7078de1 IM |
2940 | mutex_unlock(&tracing_cpumask_update_lock); |
2941 | ||
2942 | return count; | |
2943 | } | |
2944 | ||
2945 | static ssize_t | |
2946 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, | |
2947 | size_t count, loff_t *ppos) | |
2948 | { | |
2b6080f2 | 2949 | struct trace_array *tr = filp->private_data; |
9e01c1b7 | 2950 | cpumask_var_t tracing_cpumask_new; |
2b6080f2 | 2951 | int err, cpu; |
9e01c1b7 RR |
2952 | |
2953 | if (!alloc_cpumask_var(&tracing_cpumask_new, GFP_KERNEL)) | |
2954 | return -ENOMEM; | |
c7078de1 | 2955 | |
9e01c1b7 | 2956 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); |
c7078de1 | 2957 | if (err) |
36dfe925 IM |
2958 | goto err_unlock; |
2959 | ||
215368e8 LZ |
2960 | mutex_lock(&tracing_cpumask_update_lock); |
2961 | ||
a5e25883 | 2962 | local_irq_disable(); |
0199c4e6 | 2963 | arch_spin_lock(&ftrace_max_lock); |
ab46428c | 2964 | for_each_tracing_cpu(cpu) { |
36dfe925 IM |
2965 | /* |
2966 | * Increase/decrease the disabled counter if we are | |
2967 | * about to flip a bit in the cpumask: | |
2968 | */ | |
9e01c1b7 RR |
2969 | if (cpumask_test_cpu(cpu, tracing_cpumask) && |
2970 | !cpumask_test_cpu(cpu, tracing_cpumask_new)) { | |
12883efb SRRH |
2971 | atomic_inc(&per_cpu_ptr(tr->trace_buffer.data, cpu)->disabled); |
2972 | ring_buffer_record_disable_cpu(tr->trace_buffer.buffer, cpu); | |
36dfe925 | 2973 | } |
9e01c1b7 RR |
2974 | if (!cpumask_test_cpu(cpu, tracing_cpumask) && |
2975 | cpumask_test_cpu(cpu, tracing_cpumask_new)) { | |
12883efb SRRH |
2976 | atomic_dec(&per_cpu_ptr(tr->trace_buffer.data, cpu)->disabled); |
2977 | ring_buffer_record_enable_cpu(tr->trace_buffer.buffer, cpu); | |
36dfe925 IM |
2978 | } |
2979 | } | |
0199c4e6 | 2980 | arch_spin_unlock(&ftrace_max_lock); |
a5e25883 | 2981 | local_irq_enable(); |
36dfe925 | 2982 | |
9e01c1b7 | 2983 | cpumask_copy(tracing_cpumask, tracing_cpumask_new); |
36dfe925 IM |
2984 | |
2985 | mutex_unlock(&tracing_cpumask_update_lock); | |
9e01c1b7 | 2986 | free_cpumask_var(tracing_cpumask_new); |
c7078de1 IM |
2987 | |
2988 | return count; | |
36dfe925 IM |
2989 | |
2990 | err_unlock: | |
215368e8 | 2991 | free_cpumask_var(tracing_cpumask_new); |
36dfe925 IM |
2992 | |
2993 | return err; | |
c7078de1 IM |
2994 | } |
2995 | ||
5e2336a0 | 2996 | static const struct file_operations tracing_cpumask_fops = { |
c7078de1 IM |
2997 | .open = tracing_open_generic, |
2998 | .read = tracing_cpumask_read, | |
2999 | .write = tracing_cpumask_write, | |
b444786f | 3000 | .llseek = generic_file_llseek, |
bc0c38d1 SR |
3001 | }; |
3002 | ||
fdb372ed | 3003 | static int tracing_trace_options_show(struct seq_file *m, void *v) |
bc0c38d1 | 3004 | { |
d8e83d26 | 3005 | struct tracer_opt *trace_opts; |
2b6080f2 | 3006 | struct trace_array *tr = m->private; |
d8e83d26 | 3007 | u32 tracer_flags; |
d8e83d26 | 3008 | int i; |
adf9f195 | 3009 | |
d8e83d26 | 3010 | mutex_lock(&trace_types_lock); |
2b6080f2 SR |
3011 | tracer_flags = tr->current_trace->flags->val; |
3012 | trace_opts = tr->current_trace->flags->opts; | |
d8e83d26 | 3013 | |
bc0c38d1 SR |
3014 | for (i = 0; trace_options[i]; i++) { |
3015 | if (trace_flags & (1 << i)) | |
fdb372ed | 3016 | seq_printf(m, "%s\n", trace_options[i]); |
bc0c38d1 | 3017 | else |
fdb372ed | 3018 | seq_printf(m, "no%s\n", trace_options[i]); |
bc0c38d1 SR |
3019 | } |
3020 | ||
adf9f195 FW |
3021 | for (i = 0; trace_opts[i].name; i++) { |
3022 | if (tracer_flags & trace_opts[i].bit) | |
fdb372ed | 3023 | seq_printf(m, "%s\n", trace_opts[i].name); |
adf9f195 | 3024 | else |
fdb372ed | 3025 | seq_printf(m, "no%s\n", trace_opts[i].name); |
adf9f195 | 3026 | } |
d8e83d26 | 3027 | mutex_unlock(&trace_types_lock); |
adf9f195 | 3028 | |
fdb372ed | 3029 | return 0; |
bc0c38d1 | 3030 | } |
bc0c38d1 | 3031 | |
8d18eaaf LZ |
3032 | static int __set_tracer_option(struct tracer *trace, |
3033 | struct tracer_flags *tracer_flags, | |
3034 | struct tracer_opt *opts, int neg) | |
3035 | { | |
3036 | int ret; | |
bc0c38d1 | 3037 | |
8d18eaaf LZ |
3038 | ret = trace->set_flag(tracer_flags->val, opts->bit, !neg); |
3039 | if (ret) | |
3040 | return ret; | |
3041 | ||
3042 | if (neg) | |
3043 | tracer_flags->val &= ~opts->bit; | |
3044 | else | |
3045 | tracer_flags->val |= opts->bit; | |
3046 | return 0; | |
bc0c38d1 SR |
3047 | } |
3048 | ||
adf9f195 FW |
3049 | /* Try to assign a tracer specific option */ |
3050 | static int set_tracer_option(struct tracer *trace, char *cmp, int neg) | |
3051 | { | |
7770841e | 3052 | struct tracer_flags *tracer_flags = trace->flags; |
adf9f195 | 3053 | struct tracer_opt *opts = NULL; |
8d18eaaf | 3054 | int i; |
adf9f195 | 3055 | |
7770841e Z |
3056 | for (i = 0; tracer_flags->opts[i].name; i++) { |
3057 | opts = &tracer_flags->opts[i]; | |
adf9f195 | 3058 | |
8d18eaaf LZ |
3059 | if (strcmp(cmp, opts->name) == 0) |
3060 | return __set_tracer_option(trace, trace->flags, | |
3061 | opts, neg); | |
adf9f195 | 3062 | } |
adf9f195 | 3063 | |
8d18eaaf | 3064 | return -EINVAL; |
adf9f195 FW |
3065 | } |
3066 | ||
613f04a0 SRRH |
3067 | /* Some tracers require overwrite to stay enabled */ |
3068 | int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set) | |
3069 | { | |
3070 | if (tracer->enabled && (mask & TRACE_ITER_OVERWRITE) && !set) | |
3071 | return -1; | |
3072 | ||
3073 | return 0; | |
3074 | } | |
3075 | ||
2b6080f2 | 3076 | int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled) |
af4617bd SR |
3077 | { |
3078 | /* do nothing if flag is already set */ | |
3079 | if (!!(trace_flags & mask) == !!enabled) | |
613f04a0 SRRH |
3080 | return 0; |
3081 | ||
3082 | /* Give the tracer a chance to approve the change */ | |
2b6080f2 SR |
3083 | if (tr->current_trace->flag_changed) |
3084 | if (tr->current_trace->flag_changed(tr->current_trace, mask, !!enabled)) | |
613f04a0 | 3085 | return -EINVAL; |
af4617bd SR |
3086 | |
3087 | if (enabled) | |
3088 | trace_flags |= mask; | |
3089 | else | |
3090 | trace_flags &= ~mask; | |
e870e9a1 LZ |
3091 | |
3092 | if (mask == TRACE_ITER_RECORD_CMD) | |
3093 | trace_event_enable_cmd_record(enabled); | |
750912fa | 3094 | |
80902822 | 3095 | if (mask == TRACE_ITER_OVERWRITE) { |
12883efb | 3096 | ring_buffer_change_overwrite(tr->trace_buffer.buffer, enabled); |
80902822 | 3097 | #ifdef CONFIG_TRACER_MAX_TRACE |
12883efb | 3098 | ring_buffer_change_overwrite(tr->max_buffer.buffer, enabled); |
80902822 SRRH |
3099 | #endif |
3100 | } | |
81698831 SR |
3101 | |
3102 | if (mask == TRACE_ITER_PRINTK) | |
3103 | trace_printk_start_stop_comm(enabled); | |
613f04a0 SRRH |
3104 | |
3105 | return 0; | |
af4617bd SR |
3106 | } |
3107 | ||
2b6080f2 | 3108 | static int trace_set_options(struct trace_array *tr, char *option) |
bc0c38d1 | 3109 | { |
8d18eaaf | 3110 | char *cmp; |
bc0c38d1 | 3111 | int neg = 0; |
613f04a0 | 3112 | int ret = -ENODEV; |
bc0c38d1 SR |
3113 | int i; |
3114 | ||
7bcfaf54 | 3115 | cmp = strstrip(option); |
bc0c38d1 | 3116 | |
8d18eaaf | 3117 | if (strncmp(cmp, "no", 2) == 0) { |
bc0c38d1 SR |
3118 | neg = 1; |
3119 | cmp += 2; | |
3120 | } | |
3121 | ||
69d34da2 SRRH |
3122 | mutex_lock(&trace_types_lock); |
3123 | ||
bc0c38d1 | 3124 | for (i = 0; trace_options[i]; i++) { |
8d18eaaf | 3125 | if (strcmp(cmp, trace_options[i]) == 0) { |
2b6080f2 | 3126 | ret = set_tracer_flag(tr, 1 << i, !neg); |
bc0c38d1 SR |
3127 | break; |
3128 | } | |
3129 | } | |
adf9f195 FW |
3130 | |
3131 | /* If no option could be set, test the specific tracer options */ | |
69d34da2 | 3132 | if (!trace_options[i]) |
2b6080f2 | 3133 | ret = set_tracer_option(tr->current_trace, cmp, neg); |
69d34da2 SRRH |
3134 | |
3135 | mutex_unlock(&trace_types_lock); | |
bc0c38d1 | 3136 | |
7bcfaf54 SR |
3137 | return ret; |
3138 | } | |
3139 | ||
3140 | static ssize_t | |
3141 | tracing_trace_options_write(struct file *filp, const char __user *ubuf, | |
3142 | size_t cnt, loff_t *ppos) | |
3143 | { | |
2b6080f2 SR |
3144 | struct seq_file *m = filp->private_data; |
3145 | struct trace_array *tr = m->private; | |
7bcfaf54 | 3146 | char buf[64]; |
613f04a0 | 3147 | int ret; |
7bcfaf54 SR |
3148 | |
3149 | if (cnt >= sizeof(buf)) | |
3150 | return -EINVAL; | |
3151 | ||
3152 | if (copy_from_user(&buf, ubuf, cnt)) | |
3153 | return -EFAULT; | |
3154 | ||
a8dd2176 SR |
3155 | buf[cnt] = 0; |
3156 | ||
2b6080f2 | 3157 | ret = trace_set_options(tr, buf); |
613f04a0 SRRH |
3158 | if (ret < 0) |
3159 | return ret; | |
7bcfaf54 | 3160 | |
cf8517cf | 3161 | *ppos += cnt; |
bc0c38d1 SR |
3162 | |
3163 | return cnt; | |
3164 | } | |
3165 | ||
fdb372ed LZ |
3166 | static int tracing_trace_options_open(struct inode *inode, struct file *file) |
3167 | { | |
3168 | if (tracing_disabled) | |
3169 | return -ENODEV; | |
2b6080f2 SR |
3170 | |
3171 | return single_open(file, tracing_trace_options_show, inode->i_private); | |
fdb372ed LZ |
3172 | } |
3173 | ||
5e2336a0 | 3174 | static const struct file_operations tracing_iter_fops = { |
fdb372ed LZ |
3175 | .open = tracing_trace_options_open, |
3176 | .read = seq_read, | |
3177 | .llseek = seq_lseek, | |
3178 | .release = single_release, | |
ee6bce52 | 3179 | .write = tracing_trace_options_write, |
bc0c38d1 SR |
3180 | }; |
3181 | ||
7bd2f24c IM |
3182 | static const char readme_msg[] = |
3183 | "tracing mini-HOWTO:\n\n" | |
156f5a78 GL |
3184 | "# mount -t debugfs nodev /sys/kernel/debug\n\n" |
3185 | "# cat /sys/kernel/debug/tracing/available_tracers\n" | |
1e42e83f | 3186 | "wakeup wakeup_rt preemptirqsoff preemptoff irqsoff function nop\n\n" |
156f5a78 | 3187 | "# cat /sys/kernel/debug/tracing/current_tracer\n" |
bc2b6871 | 3188 | "nop\n" |
1e42e83f | 3189 | "# echo wakeup > /sys/kernel/debug/tracing/current_tracer\n" |
156f5a78 | 3190 | "# cat /sys/kernel/debug/tracing/current_tracer\n" |
1e42e83f | 3191 | "wakeup\n" |
156f5a78 | 3192 | "# cat /sys/kernel/debug/tracing/trace_options\n" |
7bd2f24c | 3193 | "noprint-parent nosym-offset nosym-addr noverbose\n" |
156f5a78 | 3194 | "# echo print-parent > /sys/kernel/debug/tracing/trace_options\n" |
9b5f8b31 | 3195 | "# echo 1 > /sys/kernel/debug/tracing/tracing_on\n" |
156f5a78 | 3196 | "# cat /sys/kernel/debug/tracing/trace > /tmp/trace.txt\n" |
9b5f8b31 | 3197 | "# echo 0 > /sys/kernel/debug/tracing/tracing_on\n" |
7bd2f24c IM |
3198 | ; |
3199 | ||
3200 | static ssize_t | |
3201 | tracing_readme_read(struct file *filp, char __user *ubuf, | |
3202 | size_t cnt, loff_t *ppos) | |
3203 | { | |
3204 | return simple_read_from_buffer(ubuf, cnt, ppos, | |
3205 | readme_msg, strlen(readme_msg)); | |
3206 | } | |
3207 | ||
5e2336a0 | 3208 | static const struct file_operations tracing_readme_fops = { |
c7078de1 IM |
3209 | .open = tracing_open_generic, |
3210 | .read = tracing_readme_read, | |
b444786f | 3211 | .llseek = generic_file_llseek, |
7bd2f24c IM |
3212 | }; |
3213 | ||
69abe6a5 AP |
3214 | static ssize_t |
3215 | tracing_saved_cmdlines_read(struct file *file, char __user *ubuf, | |
3216 | size_t cnt, loff_t *ppos) | |
3217 | { | |
3218 | char *buf_comm; | |
3219 | char *file_buf; | |
3220 | char *buf; | |
3221 | int len = 0; | |
3222 | int pid; | |
3223 | int i; | |
3224 | ||
3225 | file_buf = kmalloc(SAVED_CMDLINES*(16+TASK_COMM_LEN), GFP_KERNEL); | |
3226 | if (!file_buf) | |
3227 | return -ENOMEM; | |
3228 | ||
3229 | buf_comm = kmalloc(TASK_COMM_LEN, GFP_KERNEL); | |
3230 | if (!buf_comm) { | |
3231 | kfree(file_buf); | |
3232 | return -ENOMEM; | |
3233 | } | |
3234 | ||
3235 | buf = file_buf; | |
3236 | ||
3237 | for (i = 0; i < SAVED_CMDLINES; i++) { | |
3238 | int r; | |
3239 | ||
3240 | pid = map_cmdline_to_pid[i]; | |
3241 | if (pid == -1 || pid == NO_CMDLINE_MAP) | |
3242 | continue; | |
3243 | ||
3244 | trace_find_cmdline(pid, buf_comm); | |
3245 | r = sprintf(buf, "%d %s\n", pid, buf_comm); | |
3246 | buf += r; | |
3247 | len += r; | |
3248 | } | |
3249 | ||
3250 | len = simple_read_from_buffer(ubuf, cnt, ppos, | |
3251 | file_buf, len); | |
3252 | ||
3253 | kfree(file_buf); | |
3254 | kfree(buf_comm); | |
3255 | ||
3256 | return len; | |
3257 | } | |
3258 | ||
3259 | static const struct file_operations tracing_saved_cmdlines_fops = { | |
3260 | .open = tracing_open_generic, | |
3261 | .read = tracing_saved_cmdlines_read, | |
b444786f | 3262 | .llseek = generic_file_llseek, |
69abe6a5 AP |
3263 | }; |
3264 | ||
bc0c38d1 SR |
3265 | static ssize_t |
3266 | tracing_set_trace_read(struct file *filp, char __user *ubuf, | |
3267 | size_t cnt, loff_t *ppos) | |
3268 | { | |
2b6080f2 | 3269 | struct trace_array *tr = filp->private_data; |
ee6c2c1b | 3270 | char buf[MAX_TRACER_SIZE+2]; |
bc0c38d1 SR |
3271 | int r; |
3272 | ||
3273 | mutex_lock(&trace_types_lock); | |
2b6080f2 | 3274 | r = sprintf(buf, "%s\n", tr->current_trace->name); |
bc0c38d1 SR |
3275 | mutex_unlock(&trace_types_lock); |
3276 | ||
4bf39a94 | 3277 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
3278 | } |
3279 | ||
b6f11df2 ACM |
3280 | int tracer_init(struct tracer *t, struct trace_array *tr) |
3281 | { | |
12883efb | 3282 | tracing_reset_online_cpus(&tr->trace_buffer); |
b6f11df2 ACM |
3283 | return t->init(tr); |
3284 | } | |
3285 | ||
12883efb | 3286 | static void set_buffer_entries(struct trace_buffer *buf, unsigned long val) |
438ced17 VN |
3287 | { |
3288 | int cpu; | |
737223fb | 3289 | |
438ced17 | 3290 | for_each_tracing_cpu(cpu) |
12883efb | 3291 | per_cpu_ptr(buf->data, cpu)->entries = val; |
438ced17 VN |
3292 | } |
3293 | ||
12883efb | 3294 | #ifdef CONFIG_TRACER_MAX_TRACE |
d60da506 | 3295 | /* resize @tr's buffer to the size of @size_tr's entries */ |
12883efb SRRH |
3296 | static int resize_buffer_duplicate_size(struct trace_buffer *trace_buf, |
3297 | struct trace_buffer *size_buf, int cpu_id) | |
d60da506 HT |
3298 | { |
3299 | int cpu, ret = 0; | |
3300 | ||
3301 | if (cpu_id == RING_BUFFER_ALL_CPUS) { | |
3302 | for_each_tracing_cpu(cpu) { | |
12883efb SRRH |
3303 | ret = ring_buffer_resize(trace_buf->buffer, |
3304 | per_cpu_ptr(size_buf->data, cpu)->entries, cpu); | |
d60da506 HT |
3305 | if (ret < 0) |
3306 | break; | |
12883efb SRRH |
3307 | per_cpu_ptr(trace_buf->data, cpu)->entries = |
3308 | per_cpu_ptr(size_buf->data, cpu)->entries; | |
d60da506 HT |
3309 | } |
3310 | } else { | |
12883efb SRRH |
3311 | ret = ring_buffer_resize(trace_buf->buffer, |
3312 | per_cpu_ptr(size_buf->data, cpu_id)->entries, cpu_id); | |
d60da506 | 3313 | if (ret == 0) |
12883efb SRRH |
3314 | per_cpu_ptr(trace_buf->data, cpu_id)->entries = |
3315 | per_cpu_ptr(size_buf->data, cpu_id)->entries; | |
d60da506 HT |
3316 | } |
3317 | ||
3318 | return ret; | |
3319 | } | |
12883efb | 3320 | #endif /* CONFIG_TRACER_MAX_TRACE */ |
d60da506 | 3321 | |
2b6080f2 SR |
3322 | static int __tracing_resize_ring_buffer(struct trace_array *tr, |
3323 | unsigned long size, int cpu) | |
73c5162a SR |
3324 | { |
3325 | int ret; | |
3326 | ||
3327 | /* | |
3328 | * If kernel or user changes the size of the ring buffer | |
a123c52b SR |
3329 | * we use the size that was given, and we can forget about |
3330 | * expanding it later. | |
73c5162a | 3331 | */ |
55034cd6 | 3332 | ring_buffer_expanded = true; |
73c5162a | 3333 | |
b382ede6 | 3334 | /* May be called before buffers are initialized */ |
12883efb | 3335 | if (!tr->trace_buffer.buffer) |
b382ede6 SR |
3336 | return 0; |
3337 | ||
12883efb | 3338 | ret = ring_buffer_resize(tr->trace_buffer.buffer, size, cpu); |
73c5162a SR |
3339 | if (ret < 0) |
3340 | return ret; | |
3341 | ||
12883efb | 3342 | #ifdef CONFIG_TRACER_MAX_TRACE |
2b6080f2 SR |
3343 | if (!(tr->flags & TRACE_ARRAY_FL_GLOBAL) || |
3344 | !tr->current_trace->use_max_tr) | |
ef710e10 KM |
3345 | goto out; |
3346 | ||
12883efb | 3347 | ret = ring_buffer_resize(tr->max_buffer.buffer, size, cpu); |
73c5162a | 3348 | if (ret < 0) { |
12883efb SRRH |
3349 | int r = resize_buffer_duplicate_size(&tr->trace_buffer, |
3350 | &tr->trace_buffer, cpu); | |
73c5162a | 3351 | if (r < 0) { |
a123c52b SR |
3352 | /* |
3353 | * AARGH! We are left with different | |
3354 | * size max buffer!!!! | |
3355 | * The max buffer is our "snapshot" buffer. | |
3356 | * When a tracer needs a snapshot (one of the | |
3357 | * latency tracers), it swaps the max buffer | |
3358 | * with the saved snap shot. We succeeded to | |
3359 | * update the size of the main buffer, but failed to | |
3360 | * update the size of the max buffer. But when we tried | |
3361 | * to reset the main buffer to the original size, we | |
3362 | * failed there too. This is very unlikely to | |
3363 | * happen, but if it does, warn and kill all | |
3364 | * tracing. | |
3365 | */ | |
73c5162a SR |
3366 | WARN_ON(1); |
3367 | tracing_disabled = 1; | |
3368 | } | |
3369 | return ret; | |
3370 | } | |
3371 | ||
438ced17 | 3372 | if (cpu == RING_BUFFER_ALL_CPUS) |
12883efb | 3373 | set_buffer_entries(&tr->max_buffer, size); |
438ced17 | 3374 | else |
12883efb | 3375 | per_cpu_ptr(tr->max_buffer.data, cpu)->entries = size; |
438ced17 | 3376 | |
ef710e10 | 3377 | out: |
12883efb SRRH |
3378 | #endif /* CONFIG_TRACER_MAX_TRACE */ |
3379 | ||
438ced17 | 3380 | if (cpu == RING_BUFFER_ALL_CPUS) |
12883efb | 3381 | set_buffer_entries(&tr->trace_buffer, size); |
438ced17 | 3382 | else |
12883efb | 3383 | per_cpu_ptr(tr->trace_buffer.data, cpu)->entries = size; |
73c5162a SR |
3384 | |
3385 | return ret; | |
3386 | } | |
3387 | ||
2b6080f2 SR |
3388 | static ssize_t tracing_resize_ring_buffer(struct trace_array *tr, |
3389 | unsigned long size, int cpu_id) | |
4f271a2a | 3390 | { |
83f40318 | 3391 | int ret = size; |
4f271a2a VN |
3392 | |
3393 | mutex_lock(&trace_types_lock); | |
3394 | ||
438ced17 VN |
3395 | if (cpu_id != RING_BUFFER_ALL_CPUS) { |
3396 | /* make sure, this cpu is enabled in the mask */ | |
3397 | if (!cpumask_test_cpu(cpu_id, tracing_buffer_mask)) { | |
3398 | ret = -EINVAL; | |
3399 | goto out; | |
3400 | } | |
3401 | } | |
4f271a2a | 3402 | |
2b6080f2 | 3403 | ret = __tracing_resize_ring_buffer(tr, size, cpu_id); |
4f271a2a VN |
3404 | if (ret < 0) |
3405 | ret = -ENOMEM; | |
3406 | ||
438ced17 | 3407 | out: |
4f271a2a VN |
3408 | mutex_unlock(&trace_types_lock); |
3409 | ||
3410 | return ret; | |
3411 | } | |
3412 | ||
ef710e10 | 3413 | |
1852fcce SR |
3414 | /** |
3415 | * tracing_update_buffers - used by tracing facility to expand ring buffers | |
3416 | * | |
3417 | * To save on memory when the tracing is never used on a system with it | |
3418 | * configured in. The ring buffers are set to a minimum size. But once | |
3419 | * a user starts to use the tracing facility, then they need to grow | |
3420 | * to their default size. | |
3421 | * | |
3422 | * This function is to be called when a tracer is about to be used. | |
3423 | */ | |
3424 | int tracing_update_buffers(void) | |
3425 | { | |
3426 | int ret = 0; | |
3427 | ||
1027fcb2 | 3428 | mutex_lock(&trace_types_lock); |
1852fcce | 3429 | if (!ring_buffer_expanded) |
2b6080f2 | 3430 | ret = __tracing_resize_ring_buffer(&global_trace, trace_buf_size, |
438ced17 | 3431 | RING_BUFFER_ALL_CPUS); |
1027fcb2 | 3432 | mutex_unlock(&trace_types_lock); |
1852fcce SR |
3433 | |
3434 | return ret; | |
3435 | } | |
3436 | ||
577b785f SR |
3437 | struct trace_option_dentry; |
3438 | ||
3439 | static struct trace_option_dentry * | |
2b6080f2 | 3440 | create_trace_option_files(struct trace_array *tr, struct tracer *tracer); |
577b785f SR |
3441 | |
3442 | static void | |
3443 | destroy_trace_option_files(struct trace_option_dentry *topts); | |
3444 | ||
b2821ae6 | 3445 | static int tracing_set_tracer(const char *buf) |
bc0c38d1 | 3446 | { |
577b785f | 3447 | static struct trace_option_dentry *topts; |
bc0c38d1 SR |
3448 | struct trace_array *tr = &global_trace; |
3449 | struct tracer *t; | |
12883efb | 3450 | #ifdef CONFIG_TRACER_MAX_TRACE |
34600f0e | 3451 | bool had_max_tr; |
12883efb | 3452 | #endif |
d9e54076 | 3453 | int ret = 0; |
bc0c38d1 | 3454 | |
1027fcb2 SR |
3455 | mutex_lock(&trace_types_lock); |
3456 | ||
73c5162a | 3457 | if (!ring_buffer_expanded) { |
2b6080f2 | 3458 | ret = __tracing_resize_ring_buffer(tr, trace_buf_size, |
438ced17 | 3459 | RING_BUFFER_ALL_CPUS); |
73c5162a | 3460 | if (ret < 0) |
59f586db | 3461 | goto out; |
73c5162a SR |
3462 | ret = 0; |
3463 | } | |
3464 | ||
bc0c38d1 SR |
3465 | for (t = trace_types; t; t = t->next) { |
3466 | if (strcmp(t->name, buf) == 0) | |
3467 | break; | |
3468 | } | |
c2931e05 FW |
3469 | if (!t) { |
3470 | ret = -EINVAL; | |
3471 | goto out; | |
3472 | } | |
2b6080f2 | 3473 | if (t == tr->current_trace) |
bc0c38d1 SR |
3474 | goto out; |
3475 | ||
9f029e83 | 3476 | trace_branch_disable(); |
613f04a0 | 3477 | |
2b6080f2 | 3478 | tr->current_trace->enabled = false; |
613f04a0 | 3479 | |
2b6080f2 SR |
3480 | if (tr->current_trace->reset) |
3481 | tr->current_trace->reset(tr); | |
34600f0e | 3482 | |
12883efb | 3483 | /* Current trace needs to be nop_trace before synchronize_sched */ |
2b6080f2 | 3484 | tr->current_trace = &nop_trace; |
34600f0e | 3485 | |
45ad21ca SRRH |
3486 | #ifdef CONFIG_TRACER_MAX_TRACE |
3487 | had_max_tr = tr->allocated_snapshot; | |
3488 | ||
34600f0e SR |
3489 | if (had_max_tr && !t->use_max_tr) { |
3490 | /* | |
3491 | * We need to make sure that the update_max_tr sees that | |
3492 | * current_trace changed to nop_trace to keep it from | |
3493 | * swapping the buffers after we resize it. | |
3494 | * The update_max_tr is called from interrupts disabled | |
3495 | * so a synchronized_sched() is sufficient. | |
3496 | */ | |
3497 | synchronize_sched(); | |
ef710e10 KM |
3498 | /* |
3499 | * We don't free the ring buffer. instead, resize it because | |
3500 | * The max_tr ring buffer has some state (e.g. ring->clock) and | |
3501 | * we want preserve it. | |
3502 | */ | |
12883efb SRRH |
3503 | ring_buffer_resize(tr->max_buffer.buffer, 1, RING_BUFFER_ALL_CPUS); |
3504 | set_buffer_entries(&tr->max_buffer, 1); | |
3505 | tracing_reset_online_cpus(&tr->max_buffer); | |
45ad21ca | 3506 | tr->allocated_snapshot = false; |
ef710e10 | 3507 | } |
12883efb | 3508 | #endif |
577b785f SR |
3509 | destroy_trace_option_files(topts); |
3510 | ||
2b6080f2 | 3511 | topts = create_trace_option_files(tr, t); |
12883efb SRRH |
3512 | |
3513 | #ifdef CONFIG_TRACER_MAX_TRACE | |
34600f0e | 3514 | if (t->use_max_tr && !had_max_tr) { |
438ced17 | 3515 | /* we need to make per cpu buffer sizes equivalent */ |
12883efb | 3516 | ret = resize_buffer_duplicate_size(&tr->max_buffer, &tr->trace_buffer, |
d60da506 HT |
3517 | RING_BUFFER_ALL_CPUS); |
3518 | if (ret < 0) | |
3519 | goto out; | |
45ad21ca | 3520 | tr->allocated_snapshot = true; |
ef710e10 | 3521 | } |
12883efb | 3522 | #endif |
577b785f | 3523 | |
1c80025a | 3524 | if (t->init) { |
b6f11df2 | 3525 | ret = tracer_init(t, tr); |
1c80025a FW |
3526 | if (ret) |
3527 | goto out; | |
3528 | } | |
bc0c38d1 | 3529 | |
2b6080f2 SR |
3530 | tr->current_trace = t; |
3531 | tr->current_trace->enabled = true; | |
9f029e83 | 3532 | trace_branch_enable(tr); |
bc0c38d1 SR |
3533 | out: |
3534 | mutex_unlock(&trace_types_lock); | |
3535 | ||
d9e54076 PZ |
3536 | return ret; |
3537 | } | |
3538 | ||
3539 | static ssize_t | |
3540 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, | |
3541 | size_t cnt, loff_t *ppos) | |
3542 | { | |
ee6c2c1b | 3543 | char buf[MAX_TRACER_SIZE+1]; |
d9e54076 PZ |
3544 | int i; |
3545 | size_t ret; | |
e6e7a65a FW |
3546 | int err; |
3547 | ||
3548 | ret = cnt; | |
d9e54076 | 3549 | |
ee6c2c1b LZ |
3550 | if (cnt > MAX_TRACER_SIZE) |
3551 | cnt = MAX_TRACER_SIZE; | |
d9e54076 PZ |
3552 | |
3553 | if (copy_from_user(&buf, ubuf, cnt)) | |
3554 | return -EFAULT; | |
3555 | ||
3556 | buf[cnt] = 0; | |
3557 | ||
3558 | /* strip ending whitespace. */ | |
3559 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) | |
3560 | buf[i] = 0; | |
3561 | ||
e6e7a65a FW |
3562 | err = tracing_set_tracer(buf); |
3563 | if (err) | |
3564 | return err; | |
d9e54076 | 3565 | |
cf8517cf | 3566 | *ppos += ret; |
bc0c38d1 | 3567 | |
c2931e05 | 3568 | return ret; |
bc0c38d1 SR |
3569 | } |
3570 | ||
3571 | static ssize_t | |
3572 | tracing_max_lat_read(struct file *filp, char __user *ubuf, | |
3573 | size_t cnt, loff_t *ppos) | |
3574 | { | |
3575 | unsigned long *ptr = filp->private_data; | |
3576 | char buf[64]; | |
3577 | int r; | |
3578 | ||
cffae437 | 3579 | r = snprintf(buf, sizeof(buf), "%ld\n", |
bc0c38d1 | 3580 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
cffae437 SR |
3581 | if (r > sizeof(buf)) |
3582 | r = sizeof(buf); | |
4bf39a94 | 3583 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
3584 | } |
3585 | ||
3586 | static ssize_t | |
3587 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, | |
3588 | size_t cnt, loff_t *ppos) | |
3589 | { | |
5e39841c | 3590 | unsigned long *ptr = filp->private_data; |
5e39841c | 3591 | unsigned long val; |
c6caeeb1 | 3592 | int ret; |
bc0c38d1 | 3593 | |
22fe9b54 PH |
3594 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
3595 | if (ret) | |
c6caeeb1 | 3596 | return ret; |
bc0c38d1 SR |
3597 | |
3598 | *ptr = val * 1000; | |
3599 | ||
3600 | return cnt; | |
3601 | } | |
3602 | ||
b3806b43 SR |
3603 | static int tracing_open_pipe(struct inode *inode, struct file *filp) |
3604 | { | |
2b6080f2 SR |
3605 | struct trace_cpu *tc = inode->i_private; |
3606 | struct trace_array *tr = tc->tr; | |
b3806b43 | 3607 | struct trace_iterator *iter; |
b04cc6b1 | 3608 | int ret = 0; |
b3806b43 SR |
3609 | |
3610 | if (tracing_disabled) | |
3611 | return -ENODEV; | |
3612 | ||
b04cc6b1 FW |
3613 | mutex_lock(&trace_types_lock); |
3614 | ||
b3806b43 SR |
3615 | /* create a buffer to store the information to pass to userspace */ |
3616 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); | |
b04cc6b1 FW |
3617 | if (!iter) { |
3618 | ret = -ENOMEM; | |
3619 | goto out; | |
3620 | } | |
b3806b43 | 3621 | |
d7350c3f FW |
3622 | /* |
3623 | * We make a copy of the current tracer to avoid concurrent | |
3624 | * changes on it while we are reading. | |
3625 | */ | |
3626 | iter->trace = kmalloc(sizeof(*iter->trace), GFP_KERNEL); | |
3627 | if (!iter->trace) { | |
3628 | ret = -ENOMEM; | |
3629 | goto fail; | |
3630 | } | |
2b6080f2 | 3631 | *iter->trace = *tr->current_trace; |
d7350c3f | 3632 | |
4462344e | 3633 | if (!alloc_cpumask_var(&iter->started, GFP_KERNEL)) { |
b04cc6b1 | 3634 | ret = -ENOMEM; |
d7350c3f | 3635 | goto fail; |
4462344e RR |
3636 | } |
3637 | ||
a309720c | 3638 | /* trace pipe does not show start of buffer */ |
4462344e | 3639 | cpumask_setall(iter->started); |
a309720c | 3640 | |
112f38a7 SR |
3641 | if (trace_flags & TRACE_ITER_LATENCY_FMT) |
3642 | iter->iter_flags |= TRACE_FILE_LAT_FMT; | |
3643 | ||
8be0709f DS |
3644 | /* Output in nanoseconds only if we are using a clock in nanoseconds. */ |
3645 | if (trace_clocks[trace_clock_id].in_ns) | |
3646 | iter->iter_flags |= TRACE_FILE_TIME_IN_NS; | |
3647 | ||
2b6080f2 SR |
3648 | iter->cpu_file = tc->cpu; |
3649 | iter->tr = tc->tr; | |
12883efb | 3650 | iter->trace_buffer = &tc->tr->trace_buffer; |
d7350c3f | 3651 | mutex_init(&iter->mutex); |
b3806b43 SR |
3652 | filp->private_data = iter; |
3653 | ||
107bad8b SR |
3654 | if (iter->trace->pipe_open) |
3655 | iter->trace->pipe_open(iter); | |
107bad8b | 3656 | |
b444786f | 3657 | nonseekable_open(inode, filp); |
b04cc6b1 FW |
3658 | out: |
3659 | mutex_unlock(&trace_types_lock); | |
3660 | return ret; | |
d7350c3f FW |
3661 | |
3662 | fail: | |
3663 | kfree(iter->trace); | |
3664 | kfree(iter); | |
3665 | mutex_unlock(&trace_types_lock); | |
3666 | return ret; | |
b3806b43 SR |
3667 | } |
3668 | ||
3669 | static int tracing_release_pipe(struct inode *inode, struct file *file) | |
3670 | { | |
3671 | struct trace_iterator *iter = file->private_data; | |
3672 | ||
b04cc6b1 FW |
3673 | mutex_lock(&trace_types_lock); |
3674 | ||
29bf4a5e | 3675 | if (iter->trace->pipe_close) |
c521efd1 SR |
3676 | iter->trace->pipe_close(iter); |
3677 | ||
b04cc6b1 FW |
3678 | mutex_unlock(&trace_types_lock); |
3679 | ||
4462344e | 3680 | free_cpumask_var(iter->started); |
d7350c3f FW |
3681 | mutex_destroy(&iter->mutex); |
3682 | kfree(iter->trace); | |
b3806b43 | 3683 | kfree(iter); |
b3806b43 SR |
3684 | |
3685 | return 0; | |
3686 | } | |
3687 | ||
2a2cc8f7 | 3688 | static unsigned int |
cc60cdc9 | 3689 | trace_poll(struct trace_iterator *iter, struct file *filp, poll_table *poll_table) |
2a2cc8f7 | 3690 | { |
15693458 SRRH |
3691 | /* Iterators are static, they should be filled or empty */ |
3692 | if (trace_buffer_iter(iter, iter->cpu_file)) | |
3693 | return POLLIN | POLLRDNORM; | |
3694 | ||
3695 | if (trace_flags & TRACE_ITER_BLOCK) | |
2a2cc8f7 SSP |
3696 | /* |
3697 | * Always select as readable when in blocking mode | |
3698 | */ | |
3699 | return POLLIN | POLLRDNORM; | |
15693458 | 3700 | else |
12883efb | 3701 | return ring_buffer_poll_wait(iter->trace_buffer->buffer, iter->cpu_file, |
15693458 | 3702 | filp, poll_table); |
2a2cc8f7 SSP |
3703 | } |
3704 | ||
cc60cdc9 SR |
3705 | static unsigned int |
3706 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) | |
3707 | { | |
3708 | struct trace_iterator *iter = filp->private_data; | |
3709 | ||
3710 | return trace_poll(iter, filp, poll_table); | |
3711 | } | |
3712 | ||
6eaaa5d5 FW |
3713 | /* |
3714 | * This is a make-shift waitqueue. | |
3715 | * A tracer might use this callback on some rare cases: | |
3716 | * | |
3717 | * 1) the current tracer might hold the runqueue lock when it wakes up | |
3718 | * a reader, hence a deadlock (sched, function, and function graph tracers) | |
3719 | * 2) the function tracers, trace all functions, we don't want | |
3720 | * the overhead of calling wake_up and friends | |
3721 | * (and tracing them too) | |
3722 | * | |
3723 | * Anyway, this is really very primitive wakeup. | |
3724 | */ | |
3725 | void poll_wait_pipe(struct trace_iterator *iter) | |
3726 | { | |
3727 | set_current_state(TASK_INTERRUPTIBLE); | |
3728 | /* sleep for 100 msecs, and try again. */ | |
3729 | schedule_timeout(HZ / 10); | |
3730 | } | |
3731 | ||
ff98781b EGM |
3732 | /* Must be called with trace_types_lock mutex held. */ |
3733 | static int tracing_wait_pipe(struct file *filp) | |
b3806b43 SR |
3734 | { |
3735 | struct trace_iterator *iter = filp->private_data; | |
b3806b43 | 3736 | |
b3806b43 | 3737 | while (trace_empty(iter)) { |
2dc8f095 | 3738 | |
107bad8b | 3739 | if ((filp->f_flags & O_NONBLOCK)) { |
ff98781b | 3740 | return -EAGAIN; |
107bad8b | 3741 | } |
2dc8f095 | 3742 | |
d7350c3f | 3743 | mutex_unlock(&iter->mutex); |
107bad8b | 3744 | |
6eaaa5d5 | 3745 | iter->trace->wait_pipe(iter); |
b3806b43 | 3746 | |
d7350c3f | 3747 | mutex_lock(&iter->mutex); |
107bad8b | 3748 | |
6eaaa5d5 | 3749 | if (signal_pending(current)) |
ff98781b | 3750 | return -EINTR; |
b3806b43 SR |
3751 | |
3752 | /* | |
250bfd3d | 3753 | * We block until we read something and tracing is disabled. |
b3806b43 SR |
3754 | * We still block if tracing is disabled, but we have never |
3755 | * read anything. This allows a user to cat this file, and | |
3756 | * then enable tracing. But after we have read something, | |
3757 | * we give an EOF when tracing is again disabled. | |
3758 | * | |
3759 | * iter->pos will be 0 if we haven't read anything. | |
3760 | */ | |
250bfd3d | 3761 | if (!tracing_is_enabled() && iter->pos) |
b3806b43 | 3762 | break; |
b3806b43 SR |
3763 | } |
3764 | ||
ff98781b EGM |
3765 | return 1; |
3766 | } | |
3767 | ||
3768 | /* | |
3769 | * Consumer reader. | |
3770 | */ | |
3771 | static ssize_t | |
3772 | tracing_read_pipe(struct file *filp, char __user *ubuf, | |
3773 | size_t cnt, loff_t *ppos) | |
3774 | { | |
3775 | struct trace_iterator *iter = filp->private_data; | |
2b6080f2 | 3776 | struct trace_array *tr = iter->tr; |
ff98781b EGM |
3777 | ssize_t sret; |
3778 | ||
3779 | /* return any leftover data */ | |
3780 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); | |
3781 | if (sret != -EBUSY) | |
3782 | return sret; | |
3783 | ||
f9520750 | 3784 | trace_seq_init(&iter->seq); |
ff98781b | 3785 | |
d7350c3f | 3786 | /* copy the tracer to avoid using a global lock all around */ |
ff98781b | 3787 | mutex_lock(&trace_types_lock); |
2b6080f2 SR |
3788 | if (unlikely(iter->trace->name != tr->current_trace->name)) |
3789 | *iter->trace = *tr->current_trace; | |
d7350c3f FW |
3790 | mutex_unlock(&trace_types_lock); |
3791 | ||
3792 | /* | |
3793 | * Avoid more than one consumer on a single file descriptor | |
3794 | * This is just a matter of traces coherency, the ring buffer itself | |
3795 | * is protected. | |
3796 | */ | |
3797 | mutex_lock(&iter->mutex); | |
ff98781b EGM |
3798 | if (iter->trace->read) { |
3799 | sret = iter->trace->read(iter, filp, ubuf, cnt, ppos); | |
3800 | if (sret) | |
3801 | goto out; | |
3802 | } | |
3803 | ||
3804 | waitagain: | |
3805 | sret = tracing_wait_pipe(filp); | |
3806 | if (sret <= 0) | |
3807 | goto out; | |
3808 | ||
b3806b43 | 3809 | /* stop when tracing is finished */ |
ff98781b EGM |
3810 | if (trace_empty(iter)) { |
3811 | sret = 0; | |
107bad8b | 3812 | goto out; |
ff98781b | 3813 | } |
b3806b43 SR |
3814 | |
3815 | if (cnt >= PAGE_SIZE) | |
3816 | cnt = PAGE_SIZE - 1; | |
3817 | ||
53d0aa77 | 3818 | /* reset all but tr, trace, and overruns */ |
53d0aa77 SR |
3819 | memset(&iter->seq, 0, |
3820 | sizeof(struct trace_iterator) - | |
3821 | offsetof(struct trace_iterator, seq)); | |
4823ed7e | 3822 | iter->pos = -1; |
b3806b43 | 3823 | |
4f535968 | 3824 | trace_event_read_lock(); |
7e53bd42 | 3825 | trace_access_lock(iter->cpu_file); |
955b61e5 | 3826 | while (trace_find_next_entry_inc(iter) != NULL) { |
2c4f035f | 3827 | enum print_line_t ret; |
088b1e42 SR |
3828 | int len = iter->seq.len; |
3829 | ||
f9896bf3 | 3830 | ret = print_trace_line(iter); |
2c4f035f | 3831 | if (ret == TRACE_TYPE_PARTIAL_LINE) { |
088b1e42 SR |
3832 | /* don't print partial lines */ |
3833 | iter->seq.len = len; | |
b3806b43 | 3834 | break; |
088b1e42 | 3835 | } |
b91facc3 FW |
3836 | if (ret != TRACE_TYPE_NO_CONSUME) |
3837 | trace_consume(iter); | |
b3806b43 SR |
3838 | |
3839 | if (iter->seq.len >= cnt) | |
3840 | break; | |
ee5e51f5 JO |
3841 | |
3842 | /* | |
3843 | * Setting the full flag means we reached the trace_seq buffer | |
3844 | * size and we should leave by partial output condition above. | |
3845 | * One of the trace_seq_* functions is not used properly. | |
3846 | */ | |
3847 | WARN_ONCE(iter->seq.full, "full flag set for trace type %d", | |
3848 | iter->ent->type); | |
b3806b43 | 3849 | } |
7e53bd42 | 3850 | trace_access_unlock(iter->cpu_file); |
4f535968 | 3851 | trace_event_read_unlock(); |
b3806b43 | 3852 | |
b3806b43 | 3853 | /* Now copy what we have to the user */ |
6c6c2796 PP |
3854 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
3855 | if (iter->seq.readpos >= iter->seq.len) | |
f9520750 | 3856 | trace_seq_init(&iter->seq); |
9ff4b974 PP |
3857 | |
3858 | /* | |
25985edc | 3859 | * If there was nothing to send to user, in spite of consuming trace |
9ff4b974 PP |
3860 | * entries, go back to wait for more entries. |
3861 | */ | |
6c6c2796 | 3862 | if (sret == -EBUSY) |
9ff4b974 | 3863 | goto waitagain; |
b3806b43 | 3864 | |
107bad8b | 3865 | out: |
d7350c3f | 3866 | mutex_unlock(&iter->mutex); |
107bad8b | 3867 | |
6c6c2796 | 3868 | return sret; |
b3806b43 SR |
3869 | } |
3870 | ||
3c56819b EGM |
3871 | static void tracing_pipe_buf_release(struct pipe_inode_info *pipe, |
3872 | struct pipe_buffer *buf) | |
3873 | { | |
3874 | __free_page(buf->page); | |
3875 | } | |
3876 | ||
3877 | static void tracing_spd_release_pipe(struct splice_pipe_desc *spd, | |
3878 | unsigned int idx) | |
3879 | { | |
3880 | __free_page(spd->pages[idx]); | |
3881 | } | |
3882 | ||
28dfef8f | 3883 | static const struct pipe_buf_operations tracing_pipe_buf_ops = { |
34cd4998 SR |
3884 | .can_merge = 0, |
3885 | .map = generic_pipe_buf_map, | |
3886 | .unmap = generic_pipe_buf_unmap, | |
3887 | .confirm = generic_pipe_buf_confirm, | |
3888 | .release = tracing_pipe_buf_release, | |
3889 | .steal = generic_pipe_buf_steal, | |
3890 | .get = generic_pipe_buf_get, | |
3c56819b EGM |
3891 | }; |
3892 | ||
34cd4998 | 3893 | static size_t |
fa7c7f6e | 3894 | tracing_fill_pipe_page(size_t rem, struct trace_iterator *iter) |
34cd4998 SR |
3895 | { |
3896 | size_t count; | |
3897 | int ret; | |
3898 | ||
3899 | /* Seq buffer is page-sized, exactly what we need. */ | |
3900 | for (;;) { | |
3901 | count = iter->seq.len; | |
3902 | ret = print_trace_line(iter); | |
3903 | count = iter->seq.len - count; | |
3904 | if (rem < count) { | |
3905 | rem = 0; | |
3906 | iter->seq.len -= count; | |
3907 | break; | |
3908 | } | |
3909 | if (ret == TRACE_TYPE_PARTIAL_LINE) { | |
3910 | iter->seq.len -= count; | |
3911 | break; | |
3912 | } | |
3913 | ||
74e7ff8c LJ |
3914 | if (ret != TRACE_TYPE_NO_CONSUME) |
3915 | trace_consume(iter); | |
34cd4998 | 3916 | rem -= count; |
955b61e5 | 3917 | if (!trace_find_next_entry_inc(iter)) { |
34cd4998 SR |
3918 | rem = 0; |
3919 | iter->ent = NULL; | |
3920 | break; | |
3921 | } | |
3922 | } | |
3923 | ||
3924 | return rem; | |
3925 | } | |
3926 | ||
3c56819b EGM |
3927 | static ssize_t tracing_splice_read_pipe(struct file *filp, |
3928 | loff_t *ppos, | |
3929 | struct pipe_inode_info *pipe, | |
3930 | size_t len, | |
3931 | unsigned int flags) | |
3932 | { | |
35f3d14d JA |
3933 | struct page *pages_def[PIPE_DEF_BUFFERS]; |
3934 | struct partial_page partial_def[PIPE_DEF_BUFFERS]; | |
3c56819b EGM |
3935 | struct trace_iterator *iter = filp->private_data; |
3936 | struct splice_pipe_desc spd = { | |
35f3d14d JA |
3937 | .pages = pages_def, |
3938 | .partial = partial_def, | |
34cd4998 | 3939 | .nr_pages = 0, /* This gets updated below. */ |
047fe360 | 3940 | .nr_pages_max = PIPE_DEF_BUFFERS, |
34cd4998 SR |
3941 | .flags = flags, |
3942 | .ops = &tracing_pipe_buf_ops, | |
3943 | .spd_release = tracing_spd_release_pipe, | |
3c56819b | 3944 | }; |
2b6080f2 | 3945 | struct trace_array *tr = iter->tr; |
3c56819b | 3946 | ssize_t ret; |
34cd4998 | 3947 | size_t rem; |
3c56819b EGM |
3948 | unsigned int i; |
3949 | ||
35f3d14d JA |
3950 | if (splice_grow_spd(pipe, &spd)) |
3951 | return -ENOMEM; | |
3952 | ||
d7350c3f | 3953 | /* copy the tracer to avoid using a global lock all around */ |
3c56819b | 3954 | mutex_lock(&trace_types_lock); |
2b6080f2 SR |
3955 | if (unlikely(iter->trace->name != tr->current_trace->name)) |
3956 | *iter->trace = *tr->current_trace; | |
d7350c3f FW |
3957 | mutex_unlock(&trace_types_lock); |
3958 | ||
3959 | mutex_lock(&iter->mutex); | |
3c56819b EGM |
3960 | |
3961 | if (iter->trace->splice_read) { | |
3962 | ret = iter->trace->splice_read(iter, filp, | |
3963 | ppos, pipe, len, flags); | |
3964 | if (ret) | |
34cd4998 | 3965 | goto out_err; |
3c56819b EGM |
3966 | } |
3967 | ||
3968 | ret = tracing_wait_pipe(filp); | |
3969 | if (ret <= 0) | |
34cd4998 | 3970 | goto out_err; |
3c56819b | 3971 | |
955b61e5 | 3972 | if (!iter->ent && !trace_find_next_entry_inc(iter)) { |
3c56819b | 3973 | ret = -EFAULT; |
34cd4998 | 3974 | goto out_err; |
3c56819b EGM |
3975 | } |
3976 | ||
4f535968 | 3977 | trace_event_read_lock(); |
7e53bd42 | 3978 | trace_access_lock(iter->cpu_file); |
4f535968 | 3979 | |
3c56819b | 3980 | /* Fill as many pages as possible. */ |
35f3d14d JA |
3981 | for (i = 0, rem = len; i < pipe->buffers && rem; i++) { |
3982 | spd.pages[i] = alloc_page(GFP_KERNEL); | |
3983 | if (!spd.pages[i]) | |
34cd4998 | 3984 | break; |
3c56819b | 3985 | |
fa7c7f6e | 3986 | rem = tracing_fill_pipe_page(rem, iter); |
3c56819b EGM |
3987 | |
3988 | /* Copy the data into the page, so we can start over. */ | |
3989 | ret = trace_seq_to_buffer(&iter->seq, | |
35f3d14d | 3990 | page_address(spd.pages[i]), |
3c56819b EGM |
3991 | iter->seq.len); |
3992 | if (ret < 0) { | |
35f3d14d | 3993 | __free_page(spd.pages[i]); |
3c56819b EGM |
3994 | break; |
3995 | } | |
35f3d14d JA |
3996 | spd.partial[i].offset = 0; |
3997 | spd.partial[i].len = iter->seq.len; | |
3c56819b | 3998 | |
f9520750 | 3999 | trace_seq_init(&iter->seq); |
3c56819b EGM |
4000 | } |
4001 | ||
7e53bd42 | 4002 | trace_access_unlock(iter->cpu_file); |
4f535968 | 4003 | trace_event_read_unlock(); |
d7350c3f | 4004 | mutex_unlock(&iter->mutex); |
3c56819b EGM |
4005 | |
4006 | spd.nr_pages = i; | |
4007 | ||
35f3d14d JA |
4008 | ret = splice_to_pipe(pipe, &spd); |
4009 | out: | |
047fe360 | 4010 | splice_shrink_spd(&spd); |
35f3d14d | 4011 | return ret; |
3c56819b | 4012 | |
34cd4998 | 4013 | out_err: |
d7350c3f | 4014 | mutex_unlock(&iter->mutex); |
35f3d14d | 4015 | goto out; |
3c56819b EGM |
4016 | } |
4017 | ||
a98a3c3f SR |
4018 | static ssize_t |
4019 | tracing_entries_read(struct file *filp, char __user *ubuf, | |
4020 | size_t cnt, loff_t *ppos) | |
4021 | { | |
2b6080f2 SR |
4022 | struct trace_cpu *tc = filp->private_data; |
4023 | struct trace_array *tr = tc->tr; | |
438ced17 VN |
4024 | char buf[64]; |
4025 | int r = 0; | |
4026 | ssize_t ret; | |
a98a3c3f | 4027 | |
db526ca3 | 4028 | mutex_lock(&trace_types_lock); |
438ced17 | 4029 | |
2b6080f2 | 4030 | if (tc->cpu == RING_BUFFER_ALL_CPUS) { |
438ced17 VN |
4031 | int cpu, buf_size_same; |
4032 | unsigned long size; | |
4033 | ||
4034 | size = 0; | |
4035 | buf_size_same = 1; | |
4036 | /* check if all cpu sizes are same */ | |
4037 | for_each_tracing_cpu(cpu) { | |
4038 | /* fill in the size from first enabled cpu */ | |
4039 | if (size == 0) | |
12883efb SRRH |
4040 | size = per_cpu_ptr(tr->trace_buffer.data, cpu)->entries; |
4041 | if (size != per_cpu_ptr(tr->trace_buffer.data, cpu)->entries) { | |
438ced17 VN |
4042 | buf_size_same = 0; |
4043 | break; | |
4044 | } | |
4045 | } | |
4046 | ||
4047 | if (buf_size_same) { | |
4048 | if (!ring_buffer_expanded) | |
4049 | r = sprintf(buf, "%lu (expanded: %lu)\n", | |
4050 | size >> 10, | |
4051 | trace_buf_size >> 10); | |
4052 | else | |
4053 | r = sprintf(buf, "%lu\n", size >> 10); | |
4054 | } else | |
4055 | r = sprintf(buf, "X\n"); | |
4056 | } else | |
12883efb | 4057 | r = sprintf(buf, "%lu\n", per_cpu_ptr(tr->trace_buffer.data, tc->cpu)->entries >> 10); |
438ced17 | 4058 | |
db526ca3 SR |
4059 | mutex_unlock(&trace_types_lock); |
4060 | ||
438ced17 VN |
4061 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
4062 | return ret; | |
a98a3c3f SR |
4063 | } |
4064 | ||
4065 | static ssize_t | |
4066 | tracing_entries_write(struct file *filp, const char __user *ubuf, | |
4067 | size_t cnt, loff_t *ppos) | |
4068 | { | |
2b6080f2 | 4069 | struct trace_cpu *tc = filp->private_data; |
a98a3c3f | 4070 | unsigned long val; |
4f271a2a | 4071 | int ret; |
a98a3c3f | 4072 | |
22fe9b54 PH |
4073 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
4074 | if (ret) | |
c6caeeb1 | 4075 | return ret; |
a98a3c3f SR |
4076 | |
4077 | /* must have at least 1 entry */ | |
4078 | if (!val) | |
4079 | return -EINVAL; | |
4080 | ||
1696b2b0 SR |
4081 | /* value is in KB */ |
4082 | val <<= 10; | |
4083 | ||
2b6080f2 | 4084 | ret = tracing_resize_ring_buffer(tc->tr, val, tc->cpu); |
4f271a2a VN |
4085 | if (ret < 0) |
4086 | return ret; | |
a98a3c3f | 4087 | |
cf8517cf | 4088 | *ppos += cnt; |
a98a3c3f | 4089 | |
4f271a2a VN |
4090 | return cnt; |
4091 | } | |
bf5e6519 | 4092 | |
f81ab074 VN |
4093 | static ssize_t |
4094 | tracing_total_entries_read(struct file *filp, char __user *ubuf, | |
4095 | size_t cnt, loff_t *ppos) | |
4096 | { | |
4097 | struct trace_array *tr = filp->private_data; | |
4098 | char buf[64]; | |
4099 | int r, cpu; | |
4100 | unsigned long size = 0, expanded_size = 0; | |
4101 | ||
4102 | mutex_lock(&trace_types_lock); | |
4103 | for_each_tracing_cpu(cpu) { | |
12883efb | 4104 | size += per_cpu_ptr(tr->trace_buffer.data, cpu)->entries >> 10; |
f81ab074 VN |
4105 | if (!ring_buffer_expanded) |
4106 | expanded_size += trace_buf_size >> 10; | |
4107 | } | |
4108 | if (ring_buffer_expanded) | |
4109 | r = sprintf(buf, "%lu\n", size); | |
4110 | else | |
4111 | r = sprintf(buf, "%lu (expanded: %lu)\n", size, expanded_size); | |
4112 | mutex_unlock(&trace_types_lock); | |
4113 | ||
4114 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
4115 | } | |
4116 | ||
4f271a2a VN |
4117 | static ssize_t |
4118 | tracing_free_buffer_write(struct file *filp, const char __user *ubuf, | |
4119 | size_t cnt, loff_t *ppos) | |
4120 | { | |
4121 | /* | |
4122 | * There is no need to read what the user has written, this function | |
4123 | * is just to make sure that there is no error when "echo" is used | |
4124 | */ | |
4125 | ||
4126 | *ppos += cnt; | |
a98a3c3f SR |
4127 | |
4128 | return cnt; | |
4129 | } | |
4130 | ||
4f271a2a VN |
4131 | static int |
4132 | tracing_free_buffer_release(struct inode *inode, struct file *filp) | |
4133 | { | |
2b6080f2 SR |
4134 | struct trace_array *tr = inode->i_private; |
4135 | ||
cf30cf67 SR |
4136 | /* disable tracing ? */ |
4137 | if (trace_flags & TRACE_ITER_STOP_ON_FREE) | |
4138 | tracing_off(); | |
4f271a2a | 4139 | /* resize the ring buffer to 0 */ |
2b6080f2 | 4140 | tracing_resize_ring_buffer(tr, 0, RING_BUFFER_ALL_CPUS); |
4f271a2a VN |
4141 | |
4142 | return 0; | |
4143 | } | |
4144 | ||
5bf9a1ee PP |
4145 | static ssize_t |
4146 | tracing_mark_write(struct file *filp, const char __user *ubuf, | |
4147 | size_t cnt, loff_t *fpos) | |
4148 | { | |
d696b58c SR |
4149 | unsigned long addr = (unsigned long)ubuf; |
4150 | struct ring_buffer_event *event; | |
4151 | struct ring_buffer *buffer; | |
4152 | struct print_entry *entry; | |
4153 | unsigned long irq_flags; | |
4154 | struct page *pages[2]; | |
6edb2a8a | 4155 | void *map_page[2]; |
d696b58c SR |
4156 | int nr_pages = 1; |
4157 | ssize_t written; | |
d696b58c SR |
4158 | int offset; |
4159 | int size; | |
4160 | int len; | |
4161 | int ret; | |
6edb2a8a | 4162 | int i; |
5bf9a1ee | 4163 | |
c76f0694 | 4164 | if (tracing_disabled) |
5bf9a1ee PP |
4165 | return -EINVAL; |
4166 | ||
5224c3a3 MSB |
4167 | if (!(trace_flags & TRACE_ITER_MARKERS)) |
4168 | return -EINVAL; | |
4169 | ||
5bf9a1ee PP |
4170 | if (cnt > TRACE_BUF_SIZE) |
4171 | cnt = TRACE_BUF_SIZE; | |
4172 | ||
d696b58c SR |
4173 | /* |
4174 | * Userspace is injecting traces into the kernel trace buffer. | |
4175 | * We want to be as non intrusive as possible. | |
4176 | * To do so, we do not want to allocate any special buffers | |
4177 | * or take any locks, but instead write the userspace data | |
4178 | * straight into the ring buffer. | |
4179 | * | |
4180 | * First we need to pin the userspace buffer into memory, | |
4181 | * which, most likely it is, because it just referenced it. | |
4182 | * But there's no guarantee that it is. By using get_user_pages_fast() | |
4183 | * and kmap_atomic/kunmap_atomic() we can get access to the | |
4184 | * pages directly. We then write the data directly into the | |
4185 | * ring buffer. | |
4186 | */ | |
4187 | BUILD_BUG_ON(TRACE_BUF_SIZE >= PAGE_SIZE); | |
5bf9a1ee | 4188 | |
d696b58c SR |
4189 | /* check if we cross pages */ |
4190 | if ((addr & PAGE_MASK) != ((addr + cnt) & PAGE_MASK)) | |
4191 | nr_pages = 2; | |
4192 | ||
4193 | offset = addr & (PAGE_SIZE - 1); | |
4194 | addr &= PAGE_MASK; | |
4195 | ||
4196 | ret = get_user_pages_fast(addr, nr_pages, 0, pages); | |
4197 | if (ret < nr_pages) { | |
4198 | while (--ret >= 0) | |
4199 | put_page(pages[ret]); | |
4200 | written = -EFAULT; | |
4201 | goto out; | |
5bf9a1ee | 4202 | } |
d696b58c | 4203 | |
6edb2a8a SR |
4204 | for (i = 0; i < nr_pages; i++) |
4205 | map_page[i] = kmap_atomic(pages[i]); | |
d696b58c SR |
4206 | |
4207 | local_save_flags(irq_flags); | |
4208 | size = sizeof(*entry) + cnt + 2; /* possible \n added */ | |
12883efb | 4209 | buffer = global_trace.trace_buffer.buffer; |
d696b58c SR |
4210 | event = trace_buffer_lock_reserve(buffer, TRACE_PRINT, size, |
4211 | irq_flags, preempt_count()); | |
4212 | if (!event) { | |
4213 | /* Ring buffer disabled, return as if not open for write */ | |
4214 | written = -EBADF; | |
4215 | goto out_unlock; | |
5bf9a1ee | 4216 | } |
d696b58c SR |
4217 | |
4218 | entry = ring_buffer_event_data(event); | |
4219 | entry->ip = _THIS_IP_; | |
4220 | ||
4221 | if (nr_pages == 2) { | |
4222 | len = PAGE_SIZE - offset; | |
6edb2a8a SR |
4223 | memcpy(&entry->buf, map_page[0] + offset, len); |
4224 | memcpy(&entry->buf[len], map_page[1], cnt - len); | |
c13d2f7c | 4225 | } else |
6edb2a8a | 4226 | memcpy(&entry->buf, map_page[0] + offset, cnt); |
5bf9a1ee | 4227 | |
d696b58c SR |
4228 | if (entry->buf[cnt - 1] != '\n') { |
4229 | entry->buf[cnt] = '\n'; | |
4230 | entry->buf[cnt + 1] = '\0'; | |
4231 | } else | |
4232 | entry->buf[cnt] = '\0'; | |
4233 | ||
7ffbd48d | 4234 | __buffer_unlock_commit(buffer, event); |
5bf9a1ee | 4235 | |
d696b58c | 4236 | written = cnt; |
5bf9a1ee | 4237 | |
d696b58c | 4238 | *fpos += written; |
1aa54bca | 4239 | |
d696b58c | 4240 | out_unlock: |
6edb2a8a SR |
4241 | for (i = 0; i < nr_pages; i++){ |
4242 | kunmap_atomic(map_page[i]); | |
4243 | put_page(pages[i]); | |
4244 | } | |
d696b58c | 4245 | out: |
1aa54bca | 4246 | return written; |
5bf9a1ee PP |
4247 | } |
4248 | ||
13f16d20 | 4249 | static int tracing_clock_show(struct seq_file *m, void *v) |
5079f326 | 4250 | { |
2b6080f2 | 4251 | struct trace_array *tr = m->private; |
5079f326 Z |
4252 | int i; |
4253 | ||
4254 | for (i = 0; i < ARRAY_SIZE(trace_clocks); i++) | |
13f16d20 | 4255 | seq_printf(m, |
5079f326 | 4256 | "%s%s%s%s", i ? " " : "", |
2b6080f2 SR |
4257 | i == tr->clock_id ? "[" : "", trace_clocks[i].name, |
4258 | i == tr->clock_id ? "]" : ""); | |
13f16d20 | 4259 | seq_putc(m, '\n'); |
5079f326 | 4260 | |
13f16d20 | 4261 | return 0; |
5079f326 Z |
4262 | } |
4263 | ||
4264 | static ssize_t tracing_clock_write(struct file *filp, const char __user *ubuf, | |
4265 | size_t cnt, loff_t *fpos) | |
4266 | { | |
2b6080f2 SR |
4267 | struct seq_file *m = filp->private_data; |
4268 | struct trace_array *tr = m->private; | |
5079f326 Z |
4269 | char buf[64]; |
4270 | const char *clockstr; | |
4271 | int i; | |
4272 | ||
4273 | if (cnt >= sizeof(buf)) | |
4274 | return -EINVAL; | |
4275 | ||
4276 | if (copy_from_user(&buf, ubuf, cnt)) | |
4277 | return -EFAULT; | |
4278 | ||
4279 | buf[cnt] = 0; | |
4280 | ||
4281 | clockstr = strstrip(buf); | |
4282 | ||
4283 | for (i = 0; i < ARRAY_SIZE(trace_clocks); i++) { | |
4284 | if (strcmp(trace_clocks[i].name, clockstr) == 0) | |
4285 | break; | |
4286 | } | |
4287 | if (i == ARRAY_SIZE(trace_clocks)) | |
4288 | return -EINVAL; | |
4289 | ||
5079f326 Z |
4290 | mutex_lock(&trace_types_lock); |
4291 | ||
2b6080f2 SR |
4292 | tr->clock_id = i; |
4293 | ||
12883efb | 4294 | ring_buffer_set_clock(tr->trace_buffer.buffer, trace_clocks[i].func); |
5079f326 | 4295 | |
60303ed3 DS |
4296 | /* |
4297 | * New clock may not be consistent with the previous clock. | |
4298 | * Reset the buffer so that it doesn't have incomparable timestamps. | |
4299 | */ | |
12883efb SRRH |
4300 | tracing_reset_online_cpus(&global_trace.trace_buffer); |
4301 | ||
4302 | #ifdef CONFIG_TRACER_MAX_TRACE | |
4303 | if (tr->flags & TRACE_ARRAY_FL_GLOBAL && tr->max_buffer.buffer) | |
4304 | ring_buffer_set_clock(tr->max_buffer.buffer, trace_clocks[i].func); | |
4305 | tracing_reset_online_cpus(&global_trace.max_buffer); | |
4306 | #endif | |
60303ed3 | 4307 | |
5079f326 Z |
4308 | mutex_unlock(&trace_types_lock); |
4309 | ||
4310 | *fpos += cnt; | |
4311 | ||
4312 | return cnt; | |
4313 | } | |
4314 | ||
13f16d20 LZ |
4315 | static int tracing_clock_open(struct inode *inode, struct file *file) |
4316 | { | |
4317 | if (tracing_disabled) | |
4318 | return -ENODEV; | |
2b6080f2 SR |
4319 | |
4320 | return single_open(file, tracing_clock_show, inode->i_private); | |
13f16d20 LZ |
4321 | } |
4322 | ||
6de58e62 SRRH |
4323 | struct ftrace_buffer_info { |
4324 | struct trace_iterator iter; | |
4325 | void *spare; | |
4326 | unsigned int read; | |
4327 | }; | |
4328 | ||
debdd57f HT |
4329 | #ifdef CONFIG_TRACER_SNAPSHOT |
4330 | static int tracing_snapshot_open(struct inode *inode, struct file *file) | |
4331 | { | |
2b6080f2 | 4332 | struct trace_cpu *tc = inode->i_private; |
debdd57f | 4333 | struct trace_iterator *iter; |
2b6080f2 | 4334 | struct seq_file *m; |
debdd57f HT |
4335 | int ret = 0; |
4336 | ||
4337 | if (file->f_mode & FMODE_READ) { | |
4338 | iter = __tracing_open(inode, file, true); | |
4339 | if (IS_ERR(iter)) | |
4340 | ret = PTR_ERR(iter); | |
2b6080f2 SR |
4341 | } else { |
4342 | /* Writes still need the seq_file to hold the private data */ | |
4343 | m = kzalloc(sizeof(*m), GFP_KERNEL); | |
4344 | if (!m) | |
4345 | return -ENOMEM; | |
4346 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); | |
4347 | if (!iter) { | |
4348 | kfree(m); | |
4349 | return -ENOMEM; | |
4350 | } | |
4351 | iter->tr = tc->tr; | |
12883efb | 4352 | iter->trace_buffer = &tc->tr->max_buffer; |
f1affcaa | 4353 | iter->cpu_file = tc->cpu; |
2b6080f2 SR |
4354 | m->private = iter; |
4355 | file->private_data = m; | |
debdd57f | 4356 | } |
2b6080f2 | 4357 | |
debdd57f HT |
4358 | return ret; |
4359 | } | |
4360 | ||
4361 | static ssize_t | |
4362 | tracing_snapshot_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
4363 | loff_t *ppos) | |
4364 | { | |
2b6080f2 SR |
4365 | struct seq_file *m = filp->private_data; |
4366 | struct trace_iterator *iter = m->private; | |
4367 | struct trace_array *tr = iter->tr; | |
debdd57f HT |
4368 | unsigned long val; |
4369 | int ret; | |
4370 | ||
4371 | ret = tracing_update_buffers(); | |
4372 | if (ret < 0) | |
4373 | return ret; | |
4374 | ||
4375 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); | |
4376 | if (ret) | |
4377 | return ret; | |
4378 | ||
4379 | mutex_lock(&trace_types_lock); | |
4380 | ||
2b6080f2 | 4381 | if (tr->current_trace->use_max_tr) { |
debdd57f HT |
4382 | ret = -EBUSY; |
4383 | goto out; | |
4384 | } | |
4385 | ||
4386 | switch (val) { | |
4387 | case 0: | |
f1affcaa SRRH |
4388 | if (iter->cpu_file != RING_BUFFER_ALL_CPUS) { |
4389 | ret = -EINVAL; | |
4390 | break; | |
4391 | } | |
45ad21ca | 4392 | if (tr->allocated_snapshot) { |
debdd57f | 4393 | /* free spare buffer */ |
12883efb | 4394 | ring_buffer_resize(tr->max_buffer.buffer, 1, |
debdd57f | 4395 | RING_BUFFER_ALL_CPUS); |
12883efb SRRH |
4396 | set_buffer_entries(&tr->max_buffer, 1); |
4397 | tracing_reset_online_cpus(&tr->max_buffer); | |
45ad21ca | 4398 | tr->allocated_snapshot = false; |
debdd57f HT |
4399 | } |
4400 | break; | |
4401 | case 1: | |
f1affcaa SRRH |
4402 | /* Only allow per-cpu swap if the ring buffer supports it */ |
4403 | #ifndef CONFIG_RING_BUFFER_ALLOW_SWAP | |
4404 | if (iter->cpu_file != RING_BUFFER_ALL_CPUS) { | |
4405 | ret = -EINVAL; | |
4406 | break; | |
4407 | } | |
4408 | #endif | |
45ad21ca | 4409 | if (!tr->allocated_snapshot) { |
debdd57f | 4410 | /* allocate spare buffer */ |
12883efb SRRH |
4411 | ret = resize_buffer_duplicate_size(&tr->max_buffer, |
4412 | &tr->trace_buffer, RING_BUFFER_ALL_CPUS); | |
debdd57f HT |
4413 | if (ret < 0) |
4414 | break; | |
45ad21ca | 4415 | tr->allocated_snapshot = true; |
debdd57f | 4416 | } |
debdd57f HT |
4417 | local_irq_disable(); |
4418 | /* Now, we're going to swap */ | |
f1affcaa | 4419 | if (iter->cpu_file == RING_BUFFER_ALL_CPUS) |
ce9bae55 | 4420 | update_max_tr(tr, current, smp_processor_id()); |
f1affcaa | 4421 | else |
ce9bae55 | 4422 | update_max_tr_single(tr, current, iter->cpu_file); |
debdd57f HT |
4423 | local_irq_enable(); |
4424 | break; | |
4425 | default: | |
45ad21ca | 4426 | if (tr->allocated_snapshot) { |
f1affcaa SRRH |
4427 | if (iter->cpu_file == RING_BUFFER_ALL_CPUS) |
4428 | tracing_reset_online_cpus(&tr->max_buffer); | |
4429 | else | |
4430 | tracing_reset(&tr->max_buffer, iter->cpu_file); | |
4431 | } | |
debdd57f HT |
4432 | break; |
4433 | } | |
4434 | ||
4435 | if (ret >= 0) { | |
4436 | *ppos += cnt; | |
4437 | ret = cnt; | |
4438 | } | |
4439 | out: | |
4440 | mutex_unlock(&trace_types_lock); | |
4441 | return ret; | |
4442 | } | |
2b6080f2 SR |
4443 | |
4444 | static int tracing_snapshot_release(struct inode *inode, struct file *file) | |
4445 | { | |
4446 | struct seq_file *m = file->private_data; | |
4447 | ||
4448 | if (file->f_mode & FMODE_READ) | |
4449 | return tracing_release(inode, file); | |
4450 | ||
4451 | /* If write only, the seq_file is just a stub */ | |
4452 | if (m) | |
4453 | kfree(m->private); | |
4454 | kfree(m); | |
4455 | ||
4456 | return 0; | |
4457 | } | |
4458 | ||
6de58e62 SRRH |
4459 | static int tracing_buffers_open(struct inode *inode, struct file *filp); |
4460 | static ssize_t tracing_buffers_read(struct file *filp, char __user *ubuf, | |
4461 | size_t count, loff_t *ppos); | |
4462 | static int tracing_buffers_release(struct inode *inode, struct file *file); | |
4463 | static ssize_t tracing_buffers_splice_read(struct file *file, loff_t *ppos, | |
4464 | struct pipe_inode_info *pipe, size_t len, unsigned int flags); | |
4465 | ||
4466 | static int snapshot_raw_open(struct inode *inode, struct file *filp) | |
4467 | { | |
4468 | struct ftrace_buffer_info *info; | |
4469 | int ret; | |
4470 | ||
4471 | ret = tracing_buffers_open(inode, filp); | |
4472 | if (ret < 0) | |
4473 | return ret; | |
4474 | ||
4475 | info = filp->private_data; | |
4476 | ||
4477 | if (info->iter.trace->use_max_tr) { | |
4478 | tracing_buffers_release(inode, filp); | |
4479 | return -EBUSY; | |
4480 | } | |
4481 | ||
4482 | info->iter.snapshot = true; | |
4483 | info->iter.trace_buffer = &info->iter.tr->max_buffer; | |
4484 | ||
4485 | return ret; | |
4486 | } | |
4487 | ||
debdd57f HT |
4488 | #endif /* CONFIG_TRACER_SNAPSHOT */ |
4489 | ||
4490 | ||
5e2336a0 | 4491 | static const struct file_operations tracing_max_lat_fops = { |
4bf39a94 IM |
4492 | .open = tracing_open_generic, |
4493 | .read = tracing_max_lat_read, | |
4494 | .write = tracing_max_lat_write, | |
b444786f | 4495 | .llseek = generic_file_llseek, |
bc0c38d1 SR |
4496 | }; |
4497 | ||
5e2336a0 | 4498 | static const struct file_operations set_tracer_fops = { |
4bf39a94 IM |
4499 | .open = tracing_open_generic, |
4500 | .read = tracing_set_trace_read, | |
4501 | .write = tracing_set_trace_write, | |
b444786f | 4502 | .llseek = generic_file_llseek, |
bc0c38d1 SR |
4503 | }; |
4504 | ||
5e2336a0 | 4505 | static const struct file_operations tracing_pipe_fops = { |
4bf39a94 | 4506 | .open = tracing_open_pipe, |
2a2cc8f7 | 4507 | .poll = tracing_poll_pipe, |
4bf39a94 | 4508 | .read = tracing_read_pipe, |
3c56819b | 4509 | .splice_read = tracing_splice_read_pipe, |
4bf39a94 | 4510 | .release = tracing_release_pipe, |
b444786f | 4511 | .llseek = no_llseek, |
b3806b43 SR |
4512 | }; |
4513 | ||
5e2336a0 | 4514 | static const struct file_operations tracing_entries_fops = { |
2b6080f2 | 4515 | .open = tracing_open_generic, |
a98a3c3f SR |
4516 | .read = tracing_entries_read, |
4517 | .write = tracing_entries_write, | |
b444786f | 4518 | .llseek = generic_file_llseek, |
a98a3c3f SR |
4519 | }; |
4520 | ||
f81ab074 VN |
4521 | static const struct file_operations tracing_total_entries_fops = { |
4522 | .open = tracing_open_generic, | |
4523 | .read = tracing_total_entries_read, | |
4524 | .llseek = generic_file_llseek, | |
4525 | }; | |
4526 | ||
4f271a2a VN |
4527 | static const struct file_operations tracing_free_buffer_fops = { |
4528 | .write = tracing_free_buffer_write, | |
4529 | .release = tracing_free_buffer_release, | |
4530 | }; | |
4531 | ||
5e2336a0 | 4532 | static const struct file_operations tracing_mark_fops = { |
43a15386 | 4533 | .open = tracing_open_generic, |
5bf9a1ee | 4534 | .write = tracing_mark_write, |
b444786f | 4535 | .llseek = generic_file_llseek, |
5bf9a1ee PP |
4536 | }; |
4537 | ||
5079f326 | 4538 | static const struct file_operations trace_clock_fops = { |
13f16d20 LZ |
4539 | .open = tracing_clock_open, |
4540 | .read = seq_read, | |
4541 | .llseek = seq_lseek, | |
4542 | .release = single_release, | |
5079f326 Z |
4543 | .write = tracing_clock_write, |
4544 | }; | |
4545 | ||
debdd57f HT |
4546 | #ifdef CONFIG_TRACER_SNAPSHOT |
4547 | static const struct file_operations snapshot_fops = { | |
4548 | .open = tracing_snapshot_open, | |
4549 | .read = seq_read, | |
4550 | .write = tracing_snapshot_write, | |
4551 | .llseek = tracing_seek, | |
2b6080f2 | 4552 | .release = tracing_snapshot_release, |
debdd57f | 4553 | }; |
debdd57f | 4554 | |
6de58e62 SRRH |
4555 | static const struct file_operations snapshot_raw_fops = { |
4556 | .open = snapshot_raw_open, | |
4557 | .read = tracing_buffers_read, | |
4558 | .release = tracing_buffers_release, | |
4559 | .splice_read = tracing_buffers_splice_read, | |
4560 | .llseek = no_llseek, | |
2cadf913 SR |
4561 | }; |
4562 | ||
6de58e62 SRRH |
4563 | #endif /* CONFIG_TRACER_SNAPSHOT */ |
4564 | ||
2cadf913 SR |
4565 | static int tracing_buffers_open(struct inode *inode, struct file *filp) |
4566 | { | |
2b6080f2 SR |
4567 | struct trace_cpu *tc = inode->i_private; |
4568 | struct trace_array *tr = tc->tr; | |
2cadf913 SR |
4569 | struct ftrace_buffer_info *info; |
4570 | ||
4571 | if (tracing_disabled) | |
4572 | return -ENODEV; | |
4573 | ||
4574 | info = kzalloc(sizeof(*info), GFP_KERNEL); | |
4575 | if (!info) | |
4576 | return -ENOMEM; | |
4577 | ||
a695cb58 SRRH |
4578 | mutex_lock(&trace_types_lock); |
4579 | ||
4580 | tr->ref++; | |
4581 | ||
cc60cdc9 SR |
4582 | info->iter.tr = tr; |
4583 | info->iter.cpu_file = tc->cpu; | |
b627344f | 4584 | info->iter.trace = tr->current_trace; |
12883efb | 4585 | info->iter.trace_buffer = &tr->trace_buffer; |
cc60cdc9 | 4586 | info->spare = NULL; |
2cadf913 | 4587 | /* Force reading ring buffer for first read */ |
cc60cdc9 | 4588 | info->read = (unsigned int)-1; |
2cadf913 SR |
4589 | |
4590 | filp->private_data = info; | |
4591 | ||
a695cb58 SRRH |
4592 | mutex_unlock(&trace_types_lock); |
4593 | ||
d1e7e02f | 4594 | return nonseekable_open(inode, filp); |
2cadf913 SR |
4595 | } |
4596 | ||
cc60cdc9 SR |
4597 | static unsigned int |
4598 | tracing_buffers_poll(struct file *filp, poll_table *poll_table) | |
4599 | { | |
4600 | struct ftrace_buffer_info *info = filp->private_data; | |
4601 | struct trace_iterator *iter = &info->iter; | |
4602 | ||
4603 | return trace_poll(iter, filp, poll_table); | |
4604 | } | |
4605 | ||
2cadf913 SR |
4606 | static ssize_t |
4607 | tracing_buffers_read(struct file *filp, char __user *ubuf, | |
4608 | size_t count, loff_t *ppos) | |
4609 | { | |
4610 | struct ftrace_buffer_info *info = filp->private_data; | |
cc60cdc9 | 4611 | struct trace_iterator *iter = &info->iter; |
2cadf913 | 4612 | ssize_t ret; |
6de58e62 | 4613 | ssize_t size; |
2cadf913 | 4614 | |
2dc5d12b SR |
4615 | if (!count) |
4616 | return 0; | |
4617 | ||
6de58e62 SRRH |
4618 | mutex_lock(&trace_types_lock); |
4619 | ||
4620 | #ifdef CONFIG_TRACER_MAX_TRACE | |
4621 | if (iter->snapshot && iter->tr->current_trace->use_max_tr) { | |
4622 | size = -EBUSY; | |
4623 | goto out_unlock; | |
4624 | } | |
4625 | #endif | |
4626 | ||
ddd538f3 | 4627 | if (!info->spare) |
12883efb SRRH |
4628 | info->spare = ring_buffer_alloc_read_page(iter->trace_buffer->buffer, |
4629 | iter->cpu_file); | |
6de58e62 | 4630 | size = -ENOMEM; |
ddd538f3 | 4631 | if (!info->spare) |
6de58e62 | 4632 | goto out_unlock; |
ddd538f3 | 4633 | |
2cadf913 SR |
4634 | /* Do we have previous read data to read? */ |
4635 | if (info->read < PAGE_SIZE) | |
4636 | goto read; | |
4637 | ||
b627344f | 4638 | again: |
cc60cdc9 | 4639 | trace_access_lock(iter->cpu_file); |
12883efb | 4640 | ret = ring_buffer_read_page(iter->trace_buffer->buffer, |
2cadf913 SR |
4641 | &info->spare, |
4642 | count, | |
cc60cdc9 SR |
4643 | iter->cpu_file, 0); |
4644 | trace_access_unlock(iter->cpu_file); | |
b627344f SR |
4645 | |
4646 | if (ret < 0) { | |
4647 | if (trace_empty(iter)) { | |
6de58e62 SRRH |
4648 | if ((filp->f_flags & O_NONBLOCK)) { |
4649 | size = -EAGAIN; | |
4650 | goto out_unlock; | |
4651 | } | |
4652 | mutex_unlock(&trace_types_lock); | |
b627344f | 4653 | iter->trace->wait_pipe(iter); |
6de58e62 SRRH |
4654 | mutex_lock(&trace_types_lock); |
4655 | if (signal_pending(current)) { | |
4656 | size = -EINTR; | |
4657 | goto out_unlock; | |
4658 | } | |
b627344f SR |
4659 | goto again; |
4660 | } | |
6de58e62 SRRH |
4661 | size = 0; |
4662 | goto out_unlock; | |
b627344f | 4663 | } |
2cadf913 | 4664 | |
436fc280 | 4665 | info->read = 0; |
b627344f | 4666 | read: |
2cadf913 SR |
4667 | size = PAGE_SIZE - info->read; |
4668 | if (size > count) | |
4669 | size = count; | |
4670 | ||
4671 | ret = copy_to_user(ubuf, info->spare + info->read, size); | |
6de58e62 SRRH |
4672 | if (ret == size) { |
4673 | size = -EFAULT; | |
4674 | goto out_unlock; | |
4675 | } | |
2dc5d12b SR |
4676 | size -= ret; |
4677 | ||
2cadf913 SR |
4678 | *ppos += size; |
4679 | info->read += size; | |
4680 | ||
6de58e62 SRRH |
4681 | out_unlock: |
4682 | mutex_unlock(&trace_types_lock); | |
4683 | ||
2cadf913 SR |
4684 | return size; |
4685 | } | |
4686 | ||
4687 | static int tracing_buffers_release(struct inode *inode, struct file *file) | |
4688 | { | |
4689 | struct ftrace_buffer_info *info = file->private_data; | |
cc60cdc9 | 4690 | struct trace_iterator *iter = &info->iter; |
2cadf913 | 4691 | |
a695cb58 SRRH |
4692 | mutex_lock(&trace_types_lock); |
4693 | ||
4694 | WARN_ON(!iter->tr->ref); | |
4695 | iter->tr->ref--; | |
4696 | ||
ddd538f3 | 4697 | if (info->spare) |
12883efb | 4698 | ring_buffer_free_read_page(iter->trace_buffer->buffer, info->spare); |
2cadf913 SR |
4699 | kfree(info); |
4700 | ||
a695cb58 SRRH |
4701 | mutex_unlock(&trace_types_lock); |
4702 | ||
2cadf913 SR |
4703 | return 0; |
4704 | } | |
4705 | ||
4706 | struct buffer_ref { | |
4707 | struct ring_buffer *buffer; | |
4708 | void *page; | |
4709 | int ref; | |
4710 | }; | |
4711 | ||
4712 | static void buffer_pipe_buf_release(struct pipe_inode_info *pipe, | |
4713 | struct pipe_buffer *buf) | |
4714 | { | |
4715 | struct buffer_ref *ref = (struct buffer_ref *)buf->private; | |
4716 | ||
4717 | if (--ref->ref) | |
4718 | return; | |
4719 | ||
4720 | ring_buffer_free_read_page(ref->buffer, ref->page); | |
4721 | kfree(ref); | |
4722 | buf->private = 0; | |
4723 | } | |
4724 | ||
2cadf913 SR |
4725 | static void buffer_pipe_buf_get(struct pipe_inode_info *pipe, |
4726 | struct pipe_buffer *buf) | |
4727 | { | |
4728 | struct buffer_ref *ref = (struct buffer_ref *)buf->private; | |
4729 | ||
4730 | ref->ref++; | |
4731 | } | |
4732 | ||
4733 | /* Pipe buffer operations for a buffer. */ | |
28dfef8f | 4734 | static const struct pipe_buf_operations buffer_pipe_buf_ops = { |
2cadf913 SR |
4735 | .can_merge = 0, |
4736 | .map = generic_pipe_buf_map, | |
4737 | .unmap = generic_pipe_buf_unmap, | |
4738 | .confirm = generic_pipe_buf_confirm, | |
4739 | .release = buffer_pipe_buf_release, | |
d55cb6cf | 4740 | .steal = generic_pipe_buf_steal, |
2cadf913 SR |
4741 | .get = buffer_pipe_buf_get, |
4742 | }; | |
4743 | ||
4744 | /* | |
4745 | * Callback from splice_to_pipe(), if we need to release some pages | |
4746 | * at the end of the spd in case we error'ed out in filling the pipe. | |
4747 | */ | |
4748 | static void buffer_spd_release(struct splice_pipe_desc *spd, unsigned int i) | |
4749 | { | |
4750 | struct buffer_ref *ref = | |
4751 | (struct buffer_ref *)spd->partial[i].private; | |
4752 | ||
4753 | if (--ref->ref) | |
4754 | return; | |
4755 | ||
4756 | ring_buffer_free_read_page(ref->buffer, ref->page); | |
4757 | kfree(ref); | |
4758 | spd->partial[i].private = 0; | |
4759 | } | |
4760 | ||
4761 | static ssize_t | |
4762 | tracing_buffers_splice_read(struct file *file, loff_t *ppos, | |
4763 | struct pipe_inode_info *pipe, size_t len, | |
4764 | unsigned int flags) | |
4765 | { | |
4766 | struct ftrace_buffer_info *info = file->private_data; | |
cc60cdc9 | 4767 | struct trace_iterator *iter = &info->iter; |
35f3d14d JA |
4768 | struct partial_page partial_def[PIPE_DEF_BUFFERS]; |
4769 | struct page *pages_def[PIPE_DEF_BUFFERS]; | |
2cadf913 | 4770 | struct splice_pipe_desc spd = { |
35f3d14d JA |
4771 | .pages = pages_def, |
4772 | .partial = partial_def, | |
047fe360 | 4773 | .nr_pages_max = PIPE_DEF_BUFFERS, |
2cadf913 SR |
4774 | .flags = flags, |
4775 | .ops = &buffer_pipe_buf_ops, | |
4776 | .spd_release = buffer_spd_release, | |
4777 | }; | |
4778 | struct buffer_ref *ref; | |
93459c6c | 4779 | int entries, size, i; |
6de58e62 | 4780 | ssize_t ret; |
2cadf913 | 4781 | |
6de58e62 SRRH |
4782 | mutex_lock(&trace_types_lock); |
4783 | ||
4784 | #ifdef CONFIG_TRACER_MAX_TRACE | |
4785 | if (iter->snapshot && iter->tr->current_trace->use_max_tr) { | |
4786 | ret = -EBUSY; | |
4787 | goto out; | |
4788 | } | |
4789 | #endif | |
4790 | ||
4791 | if (splice_grow_spd(pipe, &spd)) { | |
4792 | ret = -ENOMEM; | |
4793 | goto out; | |
4794 | } | |
35f3d14d | 4795 | |
93cfb3c9 | 4796 | if (*ppos & (PAGE_SIZE - 1)) { |
35f3d14d JA |
4797 | ret = -EINVAL; |
4798 | goto out; | |
93cfb3c9 LJ |
4799 | } |
4800 | ||
4801 | if (len & (PAGE_SIZE - 1)) { | |
35f3d14d JA |
4802 | if (len < PAGE_SIZE) { |
4803 | ret = -EINVAL; | |
4804 | goto out; | |
4805 | } | |
93cfb3c9 LJ |
4806 | len &= PAGE_MASK; |
4807 | } | |
4808 | ||
cc60cdc9 SR |
4809 | again: |
4810 | trace_access_lock(iter->cpu_file); | |
12883efb | 4811 | entries = ring_buffer_entries_cpu(iter->trace_buffer->buffer, iter->cpu_file); |
93459c6c | 4812 | |
35f3d14d | 4813 | for (i = 0; i < pipe->buffers && len && entries; i++, len -= PAGE_SIZE) { |
2cadf913 SR |
4814 | struct page *page; |
4815 | int r; | |
4816 | ||
4817 | ref = kzalloc(sizeof(*ref), GFP_KERNEL); | |
4818 | if (!ref) | |
4819 | break; | |
4820 | ||
7267fa68 | 4821 | ref->ref = 1; |
12883efb | 4822 | ref->buffer = iter->trace_buffer->buffer; |
cc60cdc9 | 4823 | ref->page = ring_buffer_alloc_read_page(ref->buffer, iter->cpu_file); |
2cadf913 SR |
4824 | if (!ref->page) { |
4825 | kfree(ref); | |
4826 | break; | |
4827 | } | |
4828 | ||
4829 | r = ring_buffer_read_page(ref->buffer, &ref->page, | |
cc60cdc9 | 4830 | len, iter->cpu_file, 1); |
2cadf913 | 4831 | if (r < 0) { |
7ea59064 | 4832 | ring_buffer_free_read_page(ref->buffer, ref->page); |
2cadf913 SR |
4833 | kfree(ref); |
4834 | break; | |
4835 | } | |
4836 | ||
4837 | /* | |
4838 | * zero out any left over data, this is going to | |
4839 | * user land. | |
4840 | */ | |
4841 | size = ring_buffer_page_len(ref->page); | |
4842 | if (size < PAGE_SIZE) | |
4843 | memset(ref->page + size, 0, PAGE_SIZE - size); | |
4844 | ||
4845 | page = virt_to_page(ref->page); | |
4846 | ||
4847 | spd.pages[i] = page; | |
4848 | spd.partial[i].len = PAGE_SIZE; | |
4849 | spd.partial[i].offset = 0; | |
4850 | spd.partial[i].private = (unsigned long)ref; | |
4851 | spd.nr_pages++; | |
93cfb3c9 | 4852 | *ppos += PAGE_SIZE; |
93459c6c | 4853 | |
12883efb | 4854 | entries = ring_buffer_entries_cpu(iter->trace_buffer->buffer, iter->cpu_file); |
2cadf913 SR |
4855 | } |
4856 | ||
cc60cdc9 | 4857 | trace_access_unlock(iter->cpu_file); |
2cadf913 SR |
4858 | spd.nr_pages = i; |
4859 | ||
4860 | /* did we read anything? */ | |
4861 | if (!spd.nr_pages) { | |
cc60cdc9 | 4862 | if ((file->f_flags & O_NONBLOCK) || (flags & SPLICE_F_NONBLOCK)) { |
2cadf913 | 4863 | ret = -EAGAIN; |
cc60cdc9 SR |
4864 | goto out; |
4865 | } | |
6de58e62 | 4866 | mutex_unlock(&trace_types_lock); |
b627344f | 4867 | iter->trace->wait_pipe(iter); |
6de58e62 | 4868 | mutex_lock(&trace_types_lock); |
cc60cdc9 SR |
4869 | if (signal_pending(current)) { |
4870 | ret = -EINTR; | |
4871 | goto out; | |
4872 | } | |
4873 | goto again; | |
2cadf913 SR |
4874 | } |
4875 | ||
4876 | ret = splice_to_pipe(pipe, &spd); | |
047fe360 | 4877 | splice_shrink_spd(&spd); |
35f3d14d | 4878 | out: |
6de58e62 SRRH |
4879 | mutex_unlock(&trace_types_lock); |
4880 | ||
2cadf913 SR |
4881 | return ret; |
4882 | } | |
4883 | ||
4884 | static const struct file_operations tracing_buffers_fops = { | |
4885 | .open = tracing_buffers_open, | |
4886 | .read = tracing_buffers_read, | |
cc60cdc9 | 4887 | .poll = tracing_buffers_poll, |
2cadf913 SR |
4888 | .release = tracing_buffers_release, |
4889 | .splice_read = tracing_buffers_splice_read, | |
4890 | .llseek = no_llseek, | |
4891 | }; | |
4892 | ||
c8d77183 SR |
4893 | static ssize_t |
4894 | tracing_stats_read(struct file *filp, char __user *ubuf, | |
4895 | size_t count, loff_t *ppos) | |
4896 | { | |
2b6080f2 SR |
4897 | struct trace_cpu *tc = filp->private_data; |
4898 | struct trace_array *tr = tc->tr; | |
12883efb | 4899 | struct trace_buffer *trace_buf = &tr->trace_buffer; |
c8d77183 SR |
4900 | struct trace_seq *s; |
4901 | unsigned long cnt; | |
c64e148a VN |
4902 | unsigned long long t; |
4903 | unsigned long usec_rem; | |
2b6080f2 | 4904 | int cpu = tc->cpu; |
c8d77183 | 4905 | |
e4f2d10f | 4906 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
c8d77183 | 4907 | if (!s) |
a646365c | 4908 | return -ENOMEM; |
c8d77183 SR |
4909 | |
4910 | trace_seq_init(s); | |
4911 | ||
12883efb | 4912 | cnt = ring_buffer_entries_cpu(trace_buf->buffer, cpu); |
c8d77183 SR |
4913 | trace_seq_printf(s, "entries: %ld\n", cnt); |
4914 | ||
12883efb | 4915 | cnt = ring_buffer_overrun_cpu(trace_buf->buffer, cpu); |
c8d77183 SR |
4916 | trace_seq_printf(s, "overrun: %ld\n", cnt); |
4917 | ||
12883efb | 4918 | cnt = ring_buffer_commit_overrun_cpu(trace_buf->buffer, cpu); |
c8d77183 SR |
4919 | trace_seq_printf(s, "commit overrun: %ld\n", cnt); |
4920 | ||
12883efb | 4921 | cnt = ring_buffer_bytes_cpu(trace_buf->buffer, cpu); |
c64e148a VN |
4922 | trace_seq_printf(s, "bytes: %ld\n", cnt); |
4923 | ||
11043d8b YY |
4924 | if (trace_clocks[trace_clock_id].in_ns) { |
4925 | /* local or global for trace_clock */ | |
12883efb | 4926 | t = ns2usecs(ring_buffer_oldest_event_ts(trace_buf->buffer, cpu)); |
11043d8b YY |
4927 | usec_rem = do_div(t, USEC_PER_SEC); |
4928 | trace_seq_printf(s, "oldest event ts: %5llu.%06lu\n", | |
4929 | t, usec_rem); | |
4930 | ||
12883efb | 4931 | t = ns2usecs(ring_buffer_time_stamp(trace_buf->buffer, cpu)); |
11043d8b YY |
4932 | usec_rem = do_div(t, USEC_PER_SEC); |
4933 | trace_seq_printf(s, "now ts: %5llu.%06lu\n", t, usec_rem); | |
4934 | } else { | |
4935 | /* counter or tsc mode for trace_clock */ | |
4936 | trace_seq_printf(s, "oldest event ts: %llu\n", | |
12883efb | 4937 | ring_buffer_oldest_event_ts(trace_buf->buffer, cpu)); |
c64e148a | 4938 | |
11043d8b | 4939 | trace_seq_printf(s, "now ts: %llu\n", |
12883efb | 4940 | ring_buffer_time_stamp(trace_buf->buffer, cpu)); |
11043d8b | 4941 | } |
c64e148a | 4942 | |
12883efb | 4943 | cnt = ring_buffer_dropped_events_cpu(trace_buf->buffer, cpu); |
884bfe89 SP |
4944 | trace_seq_printf(s, "dropped events: %ld\n", cnt); |
4945 | ||
12883efb | 4946 | cnt = ring_buffer_read_events_cpu(trace_buf->buffer, cpu); |
ad964704 SRRH |
4947 | trace_seq_printf(s, "read events: %ld\n", cnt); |
4948 | ||
c8d77183 SR |
4949 | count = simple_read_from_buffer(ubuf, count, ppos, s->buffer, s->len); |
4950 | ||
4951 | kfree(s); | |
4952 | ||
4953 | return count; | |
4954 | } | |
4955 | ||
4956 | static const struct file_operations tracing_stats_fops = { | |
4957 | .open = tracing_open_generic, | |
4958 | .read = tracing_stats_read, | |
b444786f | 4959 | .llseek = generic_file_llseek, |
c8d77183 SR |
4960 | }; |
4961 | ||
bc0c38d1 SR |
4962 | #ifdef CONFIG_DYNAMIC_FTRACE |
4963 | ||
b807c3d0 SR |
4964 | int __weak ftrace_arch_read_dyn_info(char *buf, int size) |
4965 | { | |
4966 | return 0; | |
4967 | } | |
4968 | ||
bc0c38d1 | 4969 | static ssize_t |
b807c3d0 | 4970 | tracing_read_dyn_info(struct file *filp, char __user *ubuf, |
bc0c38d1 SR |
4971 | size_t cnt, loff_t *ppos) |
4972 | { | |
a26a2a27 SR |
4973 | static char ftrace_dyn_info_buffer[1024]; |
4974 | static DEFINE_MUTEX(dyn_info_mutex); | |
bc0c38d1 | 4975 | unsigned long *p = filp->private_data; |
b807c3d0 | 4976 | char *buf = ftrace_dyn_info_buffer; |
a26a2a27 | 4977 | int size = ARRAY_SIZE(ftrace_dyn_info_buffer); |
bc0c38d1 SR |
4978 | int r; |
4979 | ||
b807c3d0 SR |
4980 | mutex_lock(&dyn_info_mutex); |
4981 | r = sprintf(buf, "%ld ", *p); | |
4bf39a94 | 4982 | |
a26a2a27 | 4983 | r += ftrace_arch_read_dyn_info(buf+r, (size-1)-r); |
b807c3d0 SR |
4984 | buf[r++] = '\n'; |
4985 | ||
4986 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
4987 | ||
4988 | mutex_unlock(&dyn_info_mutex); | |
4989 | ||
4990 | return r; | |
bc0c38d1 SR |
4991 | } |
4992 | ||
5e2336a0 | 4993 | static const struct file_operations tracing_dyn_info_fops = { |
4bf39a94 | 4994 | .open = tracing_open_generic, |
b807c3d0 | 4995 | .read = tracing_read_dyn_info, |
b444786f | 4996 | .llseek = generic_file_llseek, |
bc0c38d1 SR |
4997 | }; |
4998 | #endif | |
4999 | ||
2b6080f2 | 5000 | struct dentry *tracing_init_dentry_tr(struct trace_array *tr) |
bc0c38d1 SR |
5001 | { |
5002 | static int once; | |
5003 | ||
2b6080f2 SR |
5004 | if (tr->dir) |
5005 | return tr->dir; | |
bc0c38d1 | 5006 | |
3e1f60b8 FW |
5007 | if (!debugfs_initialized()) |
5008 | return NULL; | |
5009 | ||
2b6080f2 SR |
5010 | if (tr->flags & TRACE_ARRAY_FL_GLOBAL) |
5011 | tr->dir = debugfs_create_dir("tracing", NULL); | |
bc0c38d1 | 5012 | |
2b6080f2 | 5013 | if (!tr->dir && !once) { |
bc0c38d1 SR |
5014 | once = 1; |
5015 | pr_warning("Could not create debugfs directory 'tracing'\n"); | |
5016 | return NULL; | |
5017 | } | |
5018 | ||
2b6080f2 | 5019 | return tr->dir; |
bc0c38d1 SR |
5020 | } |
5021 | ||
2b6080f2 SR |
5022 | struct dentry *tracing_init_dentry(void) |
5023 | { | |
5024 | return tracing_init_dentry_tr(&global_trace); | |
5025 | } | |
b04cc6b1 | 5026 | |
2b6080f2 | 5027 | static struct dentry *tracing_dentry_percpu(struct trace_array *tr, int cpu) |
b04cc6b1 | 5028 | { |
b04cc6b1 FW |
5029 | struct dentry *d_tracer; |
5030 | ||
2b6080f2 SR |
5031 | if (tr->percpu_dir) |
5032 | return tr->percpu_dir; | |
b04cc6b1 | 5033 | |
2b6080f2 | 5034 | d_tracer = tracing_init_dentry_tr(tr); |
b04cc6b1 FW |
5035 | if (!d_tracer) |
5036 | return NULL; | |
5037 | ||
2b6080f2 | 5038 | tr->percpu_dir = debugfs_create_dir("per_cpu", d_tracer); |
b04cc6b1 | 5039 | |
2b6080f2 SR |
5040 | WARN_ONCE(!tr->percpu_dir, |
5041 | "Could not create debugfs directory 'per_cpu/%d'\n", cpu); | |
b04cc6b1 | 5042 | |
2b6080f2 | 5043 | return tr->percpu_dir; |
b04cc6b1 FW |
5044 | } |
5045 | ||
2b6080f2 SR |
5046 | static void |
5047 | tracing_init_debugfs_percpu(struct trace_array *tr, long cpu) | |
b04cc6b1 | 5048 | { |
12883efb | 5049 | struct trace_array_cpu *data = per_cpu_ptr(tr->trace_buffer.data, cpu); |
2b6080f2 | 5050 | struct dentry *d_percpu = tracing_dentry_percpu(tr, cpu); |
5452af66 | 5051 | struct dentry *d_cpu; |
dd49a38c | 5052 | char cpu_dir[30]; /* 30 characters should be more than enough */ |
b04cc6b1 | 5053 | |
0a3d7ce7 NK |
5054 | if (!d_percpu) |
5055 | return; | |
5056 | ||
dd49a38c | 5057 | snprintf(cpu_dir, 30, "cpu%ld", cpu); |
8656e7a2 FW |
5058 | d_cpu = debugfs_create_dir(cpu_dir, d_percpu); |
5059 | if (!d_cpu) { | |
5060 | pr_warning("Could not create debugfs '%s' entry\n", cpu_dir); | |
5061 | return; | |
5062 | } | |
b04cc6b1 | 5063 | |
8656e7a2 | 5064 | /* per cpu trace_pipe */ |
5452af66 | 5065 | trace_create_file("trace_pipe", 0444, d_cpu, |
2b6080f2 | 5066 | (void *)&data->trace_cpu, &tracing_pipe_fops); |
b04cc6b1 FW |
5067 | |
5068 | /* per cpu trace */ | |
5452af66 | 5069 | trace_create_file("trace", 0644, d_cpu, |
2b6080f2 | 5070 | (void *)&data->trace_cpu, &tracing_fops); |
7f96f93f | 5071 | |
5452af66 | 5072 | trace_create_file("trace_pipe_raw", 0444, d_cpu, |
2b6080f2 | 5073 | (void *)&data->trace_cpu, &tracing_buffers_fops); |
7f96f93f | 5074 | |
c8d77183 | 5075 | trace_create_file("stats", 0444, d_cpu, |
2b6080f2 | 5076 | (void *)&data->trace_cpu, &tracing_stats_fops); |
438ced17 VN |
5077 | |
5078 | trace_create_file("buffer_size_kb", 0444, d_cpu, | |
2b6080f2 | 5079 | (void *)&data->trace_cpu, &tracing_entries_fops); |
f1affcaa SRRH |
5080 | |
5081 | #ifdef CONFIG_TRACER_SNAPSHOT | |
5082 | trace_create_file("snapshot", 0644, d_cpu, | |
5083 | (void *)&data->trace_cpu, &snapshot_fops); | |
6de58e62 SRRH |
5084 | |
5085 | trace_create_file("snapshot_raw", 0444, d_cpu, | |
5086 | (void *)&data->trace_cpu, &snapshot_raw_fops); | |
f1affcaa | 5087 | #endif |
b04cc6b1 FW |
5088 | } |
5089 | ||
60a11774 SR |
5090 | #ifdef CONFIG_FTRACE_SELFTEST |
5091 | /* Let selftest have access to static functions in this file */ | |
5092 | #include "trace_selftest.c" | |
5093 | #endif | |
5094 | ||
577b785f SR |
5095 | struct trace_option_dentry { |
5096 | struct tracer_opt *opt; | |
5097 | struct tracer_flags *flags; | |
2b6080f2 | 5098 | struct trace_array *tr; |
577b785f SR |
5099 | struct dentry *entry; |
5100 | }; | |
5101 | ||
5102 | static ssize_t | |
5103 | trace_options_read(struct file *filp, char __user *ubuf, size_t cnt, | |
5104 | loff_t *ppos) | |
5105 | { | |
5106 | struct trace_option_dentry *topt = filp->private_data; | |
5107 | char *buf; | |
5108 | ||
5109 | if (topt->flags->val & topt->opt->bit) | |
5110 | buf = "1\n"; | |
5111 | else | |
5112 | buf = "0\n"; | |
5113 | ||
5114 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
5115 | } | |
5116 | ||
5117 | static ssize_t | |
5118 | trace_options_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
5119 | loff_t *ppos) | |
5120 | { | |
5121 | struct trace_option_dentry *topt = filp->private_data; | |
5122 | unsigned long val; | |
577b785f SR |
5123 | int ret; |
5124 | ||
22fe9b54 PH |
5125 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
5126 | if (ret) | |
577b785f SR |
5127 | return ret; |
5128 | ||
8d18eaaf LZ |
5129 | if (val != 0 && val != 1) |
5130 | return -EINVAL; | |
577b785f | 5131 | |
8d18eaaf | 5132 | if (!!(topt->flags->val & topt->opt->bit) != val) { |
577b785f | 5133 | mutex_lock(&trace_types_lock); |
2b6080f2 | 5134 | ret = __set_tracer_option(topt->tr->current_trace, topt->flags, |
c757bea9 | 5135 | topt->opt, !val); |
577b785f SR |
5136 | mutex_unlock(&trace_types_lock); |
5137 | if (ret) | |
5138 | return ret; | |
577b785f SR |
5139 | } |
5140 | ||
5141 | *ppos += cnt; | |
5142 | ||
5143 | return cnt; | |
5144 | } | |
5145 | ||
5146 | ||
5147 | static const struct file_operations trace_options_fops = { | |
5148 | .open = tracing_open_generic, | |
5149 | .read = trace_options_read, | |
5150 | .write = trace_options_write, | |
b444786f | 5151 | .llseek = generic_file_llseek, |
577b785f SR |
5152 | }; |
5153 | ||
a8259075 SR |
5154 | static ssize_t |
5155 | trace_options_core_read(struct file *filp, char __user *ubuf, size_t cnt, | |
5156 | loff_t *ppos) | |
5157 | { | |
5158 | long index = (long)filp->private_data; | |
5159 | char *buf; | |
5160 | ||
5161 | if (trace_flags & (1 << index)) | |
5162 | buf = "1\n"; | |
5163 | else | |
5164 | buf = "0\n"; | |
5165 | ||
5166 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
5167 | } | |
5168 | ||
5169 | static ssize_t | |
5170 | trace_options_core_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
5171 | loff_t *ppos) | |
5172 | { | |
2b6080f2 | 5173 | struct trace_array *tr = &global_trace; |
a8259075 | 5174 | long index = (long)filp->private_data; |
a8259075 SR |
5175 | unsigned long val; |
5176 | int ret; | |
5177 | ||
22fe9b54 PH |
5178 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
5179 | if (ret) | |
a8259075 SR |
5180 | return ret; |
5181 | ||
f2d84b65 | 5182 | if (val != 0 && val != 1) |
a8259075 | 5183 | return -EINVAL; |
69d34da2 SRRH |
5184 | |
5185 | mutex_lock(&trace_types_lock); | |
2b6080f2 | 5186 | ret = set_tracer_flag(tr, 1 << index, val); |
69d34da2 | 5187 | mutex_unlock(&trace_types_lock); |
a8259075 | 5188 | |
613f04a0 SRRH |
5189 | if (ret < 0) |
5190 | return ret; | |
5191 | ||
a8259075 SR |
5192 | *ppos += cnt; |
5193 | ||
5194 | return cnt; | |
5195 | } | |
5196 | ||
a8259075 SR |
5197 | static const struct file_operations trace_options_core_fops = { |
5198 | .open = tracing_open_generic, | |
5199 | .read = trace_options_core_read, | |
5200 | .write = trace_options_core_write, | |
b444786f | 5201 | .llseek = generic_file_llseek, |
a8259075 SR |
5202 | }; |
5203 | ||
5452af66 | 5204 | struct dentry *trace_create_file(const char *name, |
f4ae40a6 | 5205 | umode_t mode, |
5452af66 FW |
5206 | struct dentry *parent, |
5207 | void *data, | |
5208 | const struct file_operations *fops) | |
5209 | { | |
5210 | struct dentry *ret; | |
5211 | ||
5212 | ret = debugfs_create_file(name, mode, parent, data, fops); | |
5213 | if (!ret) | |
5214 | pr_warning("Could not create debugfs '%s' entry\n", name); | |
5215 | ||
5216 | return ret; | |
5217 | } | |
5218 | ||
5219 | ||
2b6080f2 | 5220 | static struct dentry *trace_options_init_dentry(struct trace_array *tr) |
a8259075 SR |
5221 | { |
5222 | struct dentry *d_tracer; | |
a8259075 | 5223 | |
2b6080f2 SR |
5224 | if (tr->options) |
5225 | return tr->options; | |
a8259075 | 5226 | |
2b6080f2 | 5227 | d_tracer = tracing_init_dentry_tr(tr); |
a8259075 SR |
5228 | if (!d_tracer) |
5229 | return NULL; | |
5230 | ||
2b6080f2 SR |
5231 | tr->options = debugfs_create_dir("options", d_tracer); |
5232 | if (!tr->options) { | |
a8259075 SR |
5233 | pr_warning("Could not create debugfs directory 'options'\n"); |
5234 | return NULL; | |
5235 | } | |
5236 | ||
2b6080f2 | 5237 | return tr->options; |
a8259075 SR |
5238 | } |
5239 | ||
577b785f | 5240 | static void |
2b6080f2 SR |
5241 | create_trace_option_file(struct trace_array *tr, |
5242 | struct trace_option_dentry *topt, | |
577b785f SR |
5243 | struct tracer_flags *flags, |
5244 | struct tracer_opt *opt) | |
5245 | { | |
5246 | struct dentry *t_options; | |
577b785f | 5247 | |
2b6080f2 | 5248 | t_options = trace_options_init_dentry(tr); |
577b785f SR |
5249 | if (!t_options) |
5250 | return; | |
5251 | ||
5252 | topt->flags = flags; | |
5253 | topt->opt = opt; | |
2b6080f2 | 5254 | topt->tr = tr; |
577b785f | 5255 | |
5452af66 | 5256 | topt->entry = trace_create_file(opt->name, 0644, t_options, topt, |
577b785f SR |
5257 | &trace_options_fops); |
5258 | ||
577b785f SR |
5259 | } |
5260 | ||
5261 | static struct trace_option_dentry * | |
2b6080f2 | 5262 | create_trace_option_files(struct trace_array *tr, struct tracer *tracer) |
577b785f SR |
5263 | { |
5264 | struct trace_option_dentry *topts; | |
5265 | struct tracer_flags *flags; | |
5266 | struct tracer_opt *opts; | |
5267 | int cnt; | |
5268 | ||
5269 | if (!tracer) | |
5270 | return NULL; | |
5271 | ||
5272 | flags = tracer->flags; | |
5273 | ||
5274 | if (!flags || !flags->opts) | |
5275 | return NULL; | |
5276 | ||
5277 | opts = flags->opts; | |
5278 | ||
5279 | for (cnt = 0; opts[cnt].name; cnt++) | |
5280 | ; | |
5281 | ||
0cfe8245 | 5282 | topts = kcalloc(cnt + 1, sizeof(*topts), GFP_KERNEL); |
577b785f SR |
5283 | if (!topts) |
5284 | return NULL; | |
5285 | ||
5286 | for (cnt = 0; opts[cnt].name; cnt++) | |
2b6080f2 | 5287 | create_trace_option_file(tr, &topts[cnt], flags, |
577b785f SR |
5288 | &opts[cnt]); |
5289 | ||
5290 | return topts; | |
5291 | } | |
5292 | ||
5293 | static void | |
5294 | destroy_trace_option_files(struct trace_option_dentry *topts) | |
5295 | { | |
5296 | int cnt; | |
5297 | ||
5298 | if (!topts) | |
5299 | return; | |
5300 | ||
5301 | for (cnt = 0; topts[cnt].opt; cnt++) { | |
5302 | if (topts[cnt].entry) | |
5303 | debugfs_remove(topts[cnt].entry); | |
5304 | } | |
5305 | ||
5306 | kfree(topts); | |
5307 | } | |
5308 | ||
a8259075 | 5309 | static struct dentry * |
2b6080f2 SR |
5310 | create_trace_option_core_file(struct trace_array *tr, |
5311 | const char *option, long index) | |
a8259075 SR |
5312 | { |
5313 | struct dentry *t_options; | |
a8259075 | 5314 | |
2b6080f2 | 5315 | t_options = trace_options_init_dentry(tr); |
a8259075 SR |
5316 | if (!t_options) |
5317 | return NULL; | |
5318 | ||
5452af66 | 5319 | return trace_create_file(option, 0644, t_options, (void *)index, |
a8259075 | 5320 | &trace_options_core_fops); |
a8259075 SR |
5321 | } |
5322 | ||
2b6080f2 | 5323 | static __init void create_trace_options_dir(struct trace_array *tr) |
a8259075 SR |
5324 | { |
5325 | struct dentry *t_options; | |
a8259075 SR |
5326 | int i; |
5327 | ||
2b6080f2 | 5328 | t_options = trace_options_init_dentry(tr); |
a8259075 SR |
5329 | if (!t_options) |
5330 | return; | |
5331 | ||
5452af66 | 5332 | for (i = 0; trace_options[i]; i++) |
2b6080f2 | 5333 | create_trace_option_core_file(tr, trace_options[i], i); |
a8259075 SR |
5334 | } |
5335 | ||
499e5470 SR |
5336 | static ssize_t |
5337 | rb_simple_read(struct file *filp, char __user *ubuf, | |
5338 | size_t cnt, loff_t *ppos) | |
5339 | { | |
348f0fc2 | 5340 | struct trace_array *tr = filp->private_data; |
12883efb | 5341 | struct ring_buffer *buffer = tr->trace_buffer.buffer; |
499e5470 SR |
5342 | char buf[64]; |
5343 | int r; | |
5344 | ||
5345 | if (buffer) | |
5346 | r = ring_buffer_record_is_on(buffer); | |
5347 | else | |
5348 | r = 0; | |
5349 | ||
5350 | r = sprintf(buf, "%d\n", r); | |
5351 | ||
5352 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
5353 | } | |
5354 | ||
5355 | static ssize_t | |
5356 | rb_simple_write(struct file *filp, const char __user *ubuf, | |
5357 | size_t cnt, loff_t *ppos) | |
5358 | { | |
348f0fc2 | 5359 | struct trace_array *tr = filp->private_data; |
12883efb | 5360 | struct ring_buffer *buffer = tr->trace_buffer.buffer; |
499e5470 SR |
5361 | unsigned long val; |
5362 | int ret; | |
5363 | ||
5364 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); | |
5365 | if (ret) | |
5366 | return ret; | |
5367 | ||
5368 | if (buffer) { | |
2df8f8a6 SR |
5369 | mutex_lock(&trace_types_lock); |
5370 | if (val) { | |
499e5470 | 5371 | ring_buffer_record_on(buffer); |
2b6080f2 SR |
5372 | if (tr->current_trace->start) |
5373 | tr->current_trace->start(tr); | |
2df8f8a6 | 5374 | } else { |
499e5470 | 5375 | ring_buffer_record_off(buffer); |
2b6080f2 SR |
5376 | if (tr->current_trace->stop) |
5377 | tr->current_trace->stop(tr); | |
2df8f8a6 SR |
5378 | } |
5379 | mutex_unlock(&trace_types_lock); | |
499e5470 SR |
5380 | } |
5381 | ||
5382 | (*ppos)++; | |
5383 | ||
5384 | return cnt; | |
5385 | } | |
5386 | ||
5387 | static const struct file_operations rb_simple_fops = { | |
5388 | .open = tracing_open_generic, | |
5389 | .read = rb_simple_read, | |
5390 | .write = rb_simple_write, | |
5391 | .llseek = default_llseek, | |
5392 | }; | |
5393 | ||
277ba044 SR |
5394 | struct dentry *trace_instance_dir; |
5395 | ||
5396 | static void | |
5397 | init_tracer_debugfs(struct trace_array *tr, struct dentry *d_tracer); | |
5398 | ||
737223fb SRRH |
5399 | static void init_trace_buffers(struct trace_array *tr, struct trace_buffer *buf) |
5400 | { | |
5401 | int cpu; | |
5402 | ||
5403 | for_each_tracing_cpu(cpu) { | |
5404 | memset(per_cpu_ptr(buf->data, cpu), 0, sizeof(struct trace_array_cpu)); | |
5405 | per_cpu_ptr(buf->data, cpu)->trace_cpu.cpu = cpu; | |
5406 | per_cpu_ptr(buf->data, cpu)->trace_cpu.tr = tr; | |
5407 | } | |
5408 | } | |
5409 | ||
55034cd6 SRRH |
5410 | static int |
5411 | allocate_trace_buffer(struct trace_array *tr, struct trace_buffer *buf, int size) | |
277ba044 SR |
5412 | { |
5413 | enum ring_buffer_flags rb_flags; | |
737223fb SRRH |
5414 | |
5415 | rb_flags = trace_flags & TRACE_ITER_OVERWRITE ? RB_FL_OVERWRITE : 0; | |
5416 | ||
55034cd6 SRRH |
5417 | buf->buffer = ring_buffer_alloc(size, rb_flags); |
5418 | if (!buf->buffer) | |
5419 | return -ENOMEM; | |
737223fb | 5420 | |
55034cd6 SRRH |
5421 | buf->data = alloc_percpu(struct trace_array_cpu); |
5422 | if (!buf->data) { | |
5423 | ring_buffer_free(buf->buffer); | |
5424 | return -ENOMEM; | |
5425 | } | |
737223fb | 5426 | |
55034cd6 | 5427 | init_trace_buffers(tr, buf); |
737223fb SRRH |
5428 | |
5429 | /* Allocate the first page for all buffers */ | |
5430 | set_buffer_entries(&tr->trace_buffer, | |
5431 | ring_buffer_size(tr->trace_buffer.buffer, 0)); | |
5432 | ||
55034cd6 SRRH |
5433 | return 0; |
5434 | } | |
737223fb | 5435 | |
55034cd6 SRRH |
5436 | static int allocate_trace_buffers(struct trace_array *tr, int size) |
5437 | { | |
5438 | int ret; | |
737223fb | 5439 | |
55034cd6 SRRH |
5440 | ret = allocate_trace_buffer(tr, &tr->trace_buffer, size); |
5441 | if (ret) | |
5442 | return ret; | |
737223fb | 5443 | |
55034cd6 SRRH |
5444 | #ifdef CONFIG_TRACER_MAX_TRACE |
5445 | ret = allocate_trace_buffer(tr, &tr->max_buffer, | |
5446 | allocate_snapshot ? size : 1); | |
5447 | if (WARN_ON(ret)) { | |
737223fb | 5448 | ring_buffer_free(tr->trace_buffer.buffer); |
55034cd6 SRRH |
5449 | free_percpu(tr->trace_buffer.data); |
5450 | return -ENOMEM; | |
5451 | } | |
5452 | tr->allocated_snapshot = allocate_snapshot; | |
737223fb | 5453 | |
55034cd6 SRRH |
5454 | /* |
5455 | * Only the top level trace array gets its snapshot allocated | |
5456 | * from the kernel command line. | |
5457 | */ | |
5458 | allocate_snapshot = false; | |
737223fb | 5459 | #endif |
55034cd6 | 5460 | return 0; |
737223fb SRRH |
5461 | } |
5462 | ||
5463 | static int new_instance_create(const char *name) | |
5464 | { | |
277ba044 SR |
5465 | struct trace_array *tr; |
5466 | int ret; | |
277ba044 SR |
5467 | |
5468 | mutex_lock(&trace_types_lock); | |
5469 | ||
5470 | ret = -EEXIST; | |
5471 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
5472 | if (tr->name && strcmp(tr->name, name) == 0) | |
5473 | goto out_unlock; | |
5474 | } | |
5475 | ||
5476 | ret = -ENOMEM; | |
5477 | tr = kzalloc(sizeof(*tr), GFP_KERNEL); | |
5478 | if (!tr) | |
5479 | goto out_unlock; | |
5480 | ||
5481 | tr->name = kstrdup(name, GFP_KERNEL); | |
5482 | if (!tr->name) | |
5483 | goto out_free_tr; | |
5484 | ||
5485 | raw_spin_lock_init(&tr->start_lock); | |
5486 | ||
5487 | tr->current_trace = &nop_trace; | |
5488 | ||
5489 | INIT_LIST_HEAD(&tr->systems); | |
5490 | INIT_LIST_HEAD(&tr->events); | |
5491 | ||
737223fb | 5492 | if (allocate_trace_buffers(tr, trace_buf_size) < 0) |
277ba044 SR |
5493 | goto out_free_tr; |
5494 | ||
277ba044 SR |
5495 | /* Holder for file callbacks */ |
5496 | tr->trace_cpu.cpu = RING_BUFFER_ALL_CPUS; | |
5497 | tr->trace_cpu.tr = tr; | |
5498 | ||
5499 | tr->dir = debugfs_create_dir(name, trace_instance_dir); | |
5500 | if (!tr->dir) | |
5501 | goto out_free_tr; | |
5502 | ||
5503 | ret = event_trace_add_tracer(tr->dir, tr); | |
5504 | if (ret) | |
5505 | goto out_free_tr; | |
5506 | ||
5507 | init_tracer_debugfs(tr, tr->dir); | |
5508 | ||
5509 | list_add(&tr->list, &ftrace_trace_arrays); | |
5510 | ||
5511 | mutex_unlock(&trace_types_lock); | |
5512 | ||
5513 | return 0; | |
5514 | ||
5515 | out_free_tr: | |
12883efb SRRH |
5516 | if (tr->trace_buffer.buffer) |
5517 | ring_buffer_free(tr->trace_buffer.buffer); | |
277ba044 SR |
5518 | kfree(tr->name); |
5519 | kfree(tr); | |
5520 | ||
5521 | out_unlock: | |
5522 | mutex_unlock(&trace_types_lock); | |
5523 | ||
5524 | return ret; | |
5525 | ||
5526 | } | |
5527 | ||
0c8916c3 SR |
5528 | static int instance_delete(const char *name) |
5529 | { | |
5530 | struct trace_array *tr; | |
5531 | int found = 0; | |
5532 | int ret; | |
5533 | ||
5534 | mutex_lock(&trace_types_lock); | |
5535 | ||
5536 | ret = -ENODEV; | |
5537 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
5538 | if (tr->name && strcmp(tr->name, name) == 0) { | |
5539 | found = 1; | |
5540 | break; | |
5541 | } | |
5542 | } | |
5543 | if (!found) | |
5544 | goto out_unlock; | |
5545 | ||
a695cb58 SRRH |
5546 | ret = -EBUSY; |
5547 | if (tr->ref) | |
5548 | goto out_unlock; | |
5549 | ||
0c8916c3 SR |
5550 | list_del(&tr->list); |
5551 | ||
5552 | event_trace_del_tracer(tr); | |
5553 | debugfs_remove_recursive(tr->dir); | |
12883efb SRRH |
5554 | free_percpu(tr->trace_buffer.data); |
5555 | ring_buffer_free(tr->trace_buffer.buffer); | |
0c8916c3 SR |
5556 | |
5557 | kfree(tr->name); | |
5558 | kfree(tr); | |
5559 | ||
5560 | ret = 0; | |
5561 | ||
5562 | out_unlock: | |
5563 | mutex_unlock(&trace_types_lock); | |
5564 | ||
5565 | return ret; | |
5566 | } | |
5567 | ||
277ba044 SR |
5568 | static int instance_mkdir (struct inode *inode, struct dentry *dentry, umode_t mode) |
5569 | { | |
5570 | struct dentry *parent; | |
5571 | int ret; | |
5572 | ||
5573 | /* Paranoid: Make sure the parent is the "instances" directory */ | |
5574 | parent = hlist_entry(inode->i_dentry.first, struct dentry, d_alias); | |
5575 | if (WARN_ON_ONCE(parent != trace_instance_dir)) | |
5576 | return -ENOENT; | |
5577 | ||
5578 | /* | |
5579 | * The inode mutex is locked, but debugfs_create_dir() will also | |
5580 | * take the mutex. As the instances directory can not be destroyed | |
5581 | * or changed in any other way, it is safe to unlock it, and | |
5582 | * let the dentry try. If two users try to make the same dir at | |
5583 | * the same time, then the new_instance_create() will determine the | |
5584 | * winner. | |
5585 | */ | |
5586 | mutex_unlock(&inode->i_mutex); | |
5587 | ||
5588 | ret = new_instance_create(dentry->d_iname); | |
5589 | ||
5590 | mutex_lock(&inode->i_mutex); | |
5591 | ||
5592 | return ret; | |
5593 | } | |
5594 | ||
0c8916c3 SR |
5595 | static int instance_rmdir(struct inode *inode, struct dentry *dentry) |
5596 | { | |
5597 | struct dentry *parent; | |
5598 | int ret; | |
5599 | ||
5600 | /* Paranoid: Make sure the parent is the "instances" directory */ | |
5601 | parent = hlist_entry(inode->i_dentry.first, struct dentry, d_alias); | |
5602 | if (WARN_ON_ONCE(parent != trace_instance_dir)) | |
5603 | return -ENOENT; | |
5604 | ||
5605 | /* The caller did a dget() on dentry */ | |
5606 | mutex_unlock(&dentry->d_inode->i_mutex); | |
5607 | ||
5608 | /* | |
5609 | * The inode mutex is locked, but debugfs_create_dir() will also | |
5610 | * take the mutex. As the instances directory can not be destroyed | |
5611 | * or changed in any other way, it is safe to unlock it, and | |
5612 | * let the dentry try. If two users try to make the same dir at | |
5613 | * the same time, then the instance_delete() will determine the | |
5614 | * winner. | |
5615 | */ | |
5616 | mutex_unlock(&inode->i_mutex); | |
5617 | ||
5618 | ret = instance_delete(dentry->d_iname); | |
5619 | ||
5620 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); | |
5621 | mutex_lock(&dentry->d_inode->i_mutex); | |
5622 | ||
5623 | return ret; | |
5624 | } | |
5625 | ||
277ba044 SR |
5626 | static const struct inode_operations instance_dir_inode_operations = { |
5627 | .lookup = simple_lookup, | |
5628 | .mkdir = instance_mkdir, | |
0c8916c3 | 5629 | .rmdir = instance_rmdir, |
277ba044 SR |
5630 | }; |
5631 | ||
5632 | static __init void create_trace_instances(struct dentry *d_tracer) | |
5633 | { | |
5634 | trace_instance_dir = debugfs_create_dir("instances", d_tracer); | |
5635 | if (WARN_ON(!trace_instance_dir)) | |
5636 | return; | |
5637 | ||
5638 | /* Hijack the dir inode operations, to allow mkdir */ | |
5639 | trace_instance_dir->d_inode->i_op = &instance_dir_inode_operations; | |
5640 | } | |
5641 | ||
2b6080f2 SR |
5642 | static void |
5643 | init_tracer_debugfs(struct trace_array *tr, struct dentry *d_tracer) | |
5644 | { | |
121aaee7 | 5645 | int cpu; |
2b6080f2 SR |
5646 | |
5647 | trace_create_file("trace_options", 0644, d_tracer, | |
5648 | tr, &tracing_iter_fops); | |
5649 | ||
5650 | trace_create_file("trace", 0644, d_tracer, | |
5651 | (void *)&tr->trace_cpu, &tracing_fops); | |
5652 | ||
5653 | trace_create_file("trace_pipe", 0444, d_tracer, | |
5654 | (void *)&tr->trace_cpu, &tracing_pipe_fops); | |
5655 | ||
5656 | trace_create_file("buffer_size_kb", 0644, d_tracer, | |
5657 | (void *)&tr->trace_cpu, &tracing_entries_fops); | |
5658 | ||
5659 | trace_create_file("buffer_total_size_kb", 0444, d_tracer, | |
5660 | tr, &tracing_total_entries_fops); | |
5661 | ||
5662 | trace_create_file("free_buffer", 0644, d_tracer, | |
5663 | tr, &tracing_free_buffer_fops); | |
5664 | ||
5665 | trace_create_file("trace_marker", 0220, d_tracer, | |
5666 | tr, &tracing_mark_fops); | |
5667 | ||
5668 | trace_create_file("trace_clock", 0644, d_tracer, tr, | |
5669 | &trace_clock_fops); | |
5670 | ||
5671 | trace_create_file("tracing_on", 0644, d_tracer, | |
5672 | tr, &rb_simple_fops); | |
ce9bae55 SRRH |
5673 | |
5674 | #ifdef CONFIG_TRACER_SNAPSHOT | |
5675 | trace_create_file("snapshot", 0644, d_tracer, | |
5676 | (void *)&tr->trace_cpu, &snapshot_fops); | |
5677 | #endif | |
121aaee7 SRRH |
5678 | |
5679 | for_each_tracing_cpu(cpu) | |
5680 | tracing_init_debugfs_percpu(tr, cpu); | |
5681 | ||
2b6080f2 SR |
5682 | } |
5683 | ||
b5ad384e | 5684 | static __init int tracer_init_debugfs(void) |
bc0c38d1 SR |
5685 | { |
5686 | struct dentry *d_tracer; | |
bc0c38d1 | 5687 | |
7e53bd42 LJ |
5688 | trace_access_lock_init(); |
5689 | ||
bc0c38d1 SR |
5690 | d_tracer = tracing_init_dentry(); |
5691 | ||
2b6080f2 | 5692 | init_tracer_debugfs(&global_trace, d_tracer); |
bc0c38d1 | 5693 | |
5452af66 | 5694 | trace_create_file("tracing_cpumask", 0644, d_tracer, |
2b6080f2 | 5695 | &global_trace, &tracing_cpumask_fops); |
a8259075 | 5696 | |
5452af66 FW |
5697 | trace_create_file("available_tracers", 0444, d_tracer, |
5698 | &global_trace, &show_traces_fops); | |
5699 | ||
339ae5d3 | 5700 | trace_create_file("current_tracer", 0644, d_tracer, |
5452af66 FW |
5701 | &global_trace, &set_tracer_fops); |
5702 | ||
5d4a9dba | 5703 | #ifdef CONFIG_TRACER_MAX_TRACE |
5452af66 FW |
5704 | trace_create_file("tracing_max_latency", 0644, d_tracer, |
5705 | &tracing_max_latency, &tracing_max_lat_fops); | |
0e950173 | 5706 | #endif |
5452af66 FW |
5707 | |
5708 | trace_create_file("tracing_thresh", 0644, d_tracer, | |
5709 | &tracing_thresh, &tracing_max_lat_fops); | |
a8259075 | 5710 | |
339ae5d3 | 5711 | trace_create_file("README", 0444, d_tracer, |
5452af66 FW |
5712 | NULL, &tracing_readme_fops); |
5713 | ||
69abe6a5 AP |
5714 | trace_create_file("saved_cmdlines", 0444, d_tracer, |
5715 | NULL, &tracing_saved_cmdlines_fops); | |
5bf9a1ee | 5716 | |
bc0c38d1 | 5717 | #ifdef CONFIG_DYNAMIC_FTRACE |
5452af66 FW |
5718 | trace_create_file("dyn_ftrace_total_info", 0444, d_tracer, |
5719 | &ftrace_update_tot_cnt, &tracing_dyn_info_fops); | |
bc0c38d1 | 5720 | #endif |
b04cc6b1 | 5721 | |
277ba044 SR |
5722 | create_trace_instances(d_tracer); |
5723 | ||
2b6080f2 | 5724 | create_trace_options_dir(&global_trace); |
5452af66 | 5725 | |
b5ad384e | 5726 | return 0; |
bc0c38d1 SR |
5727 | } |
5728 | ||
3f5a54e3 SR |
5729 | static int trace_panic_handler(struct notifier_block *this, |
5730 | unsigned long event, void *unused) | |
5731 | { | |
944ac425 | 5732 | if (ftrace_dump_on_oops) |
cecbca96 | 5733 | ftrace_dump(ftrace_dump_on_oops); |
3f5a54e3 SR |
5734 | return NOTIFY_OK; |
5735 | } | |
5736 | ||
5737 | static struct notifier_block trace_panic_notifier = { | |
5738 | .notifier_call = trace_panic_handler, | |
5739 | .next = NULL, | |
5740 | .priority = 150 /* priority: INT_MAX >= x >= 0 */ | |
5741 | }; | |
5742 | ||
5743 | static int trace_die_handler(struct notifier_block *self, | |
5744 | unsigned long val, | |
5745 | void *data) | |
5746 | { | |
5747 | switch (val) { | |
5748 | case DIE_OOPS: | |
944ac425 | 5749 | if (ftrace_dump_on_oops) |
cecbca96 | 5750 | ftrace_dump(ftrace_dump_on_oops); |
3f5a54e3 SR |
5751 | break; |
5752 | default: | |
5753 | break; | |
5754 | } | |
5755 | return NOTIFY_OK; | |
5756 | } | |
5757 | ||
5758 | static struct notifier_block trace_die_notifier = { | |
5759 | .notifier_call = trace_die_handler, | |
5760 | .priority = 200 | |
5761 | }; | |
5762 | ||
5763 | /* | |
5764 | * printk is set to max of 1024, we really don't need it that big. | |
5765 | * Nothing should be printing 1000 characters anyway. | |
5766 | */ | |
5767 | #define TRACE_MAX_PRINT 1000 | |
5768 | ||
5769 | /* | |
5770 | * Define here KERN_TRACE so that we have one place to modify | |
5771 | * it if we decide to change what log level the ftrace dump | |
5772 | * should be at. | |
5773 | */ | |
428aee14 | 5774 | #define KERN_TRACE KERN_EMERG |
3f5a54e3 | 5775 | |
955b61e5 | 5776 | void |
3f5a54e3 SR |
5777 | trace_printk_seq(struct trace_seq *s) |
5778 | { | |
5779 | /* Probably should print a warning here. */ | |
5780 | if (s->len >= 1000) | |
5781 | s->len = 1000; | |
5782 | ||
5783 | /* should be zero ended, but we are paranoid. */ | |
5784 | s->buffer[s->len] = 0; | |
5785 | ||
5786 | printk(KERN_TRACE "%s", s->buffer); | |
5787 | ||
f9520750 | 5788 | trace_seq_init(s); |
3f5a54e3 SR |
5789 | } |
5790 | ||
955b61e5 JW |
5791 | void trace_init_global_iter(struct trace_iterator *iter) |
5792 | { | |
5793 | iter->tr = &global_trace; | |
2b6080f2 | 5794 | iter->trace = iter->tr->current_trace; |
ae3b5093 | 5795 | iter->cpu_file = RING_BUFFER_ALL_CPUS; |
12883efb | 5796 | iter->trace_buffer = &global_trace.trace_buffer; |
955b61e5 JW |
5797 | } |
5798 | ||
cecbca96 FW |
5799 | static void |
5800 | __ftrace_dump(bool disable_tracing, enum ftrace_dump_mode oops_dump_mode) | |
3f5a54e3 | 5801 | { |
445c8951 | 5802 | static arch_spinlock_t ftrace_dump_lock = |
edc35bd7 | 5803 | (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED; |
3f5a54e3 SR |
5804 | /* use static because iter can be a bit big for the stack */ |
5805 | static struct trace_iterator iter; | |
cf586b61 | 5806 | unsigned int old_userobj; |
3f5a54e3 | 5807 | static int dump_ran; |
d769041f SR |
5808 | unsigned long flags; |
5809 | int cnt = 0, cpu; | |
3f5a54e3 SR |
5810 | |
5811 | /* only one dump */ | |
cd891ae0 | 5812 | local_irq_save(flags); |
0199c4e6 | 5813 | arch_spin_lock(&ftrace_dump_lock); |
3f5a54e3 SR |
5814 | if (dump_ran) |
5815 | goto out; | |
5816 | ||
5817 | dump_ran = 1; | |
5818 | ||
0ee6b6cf | 5819 | tracing_off(); |
cf586b61 | 5820 | |
e0a413f6 SR |
5821 | /* Did function tracer already get disabled? */ |
5822 | if (ftrace_is_dead()) { | |
5823 | printk("# WARNING: FUNCTION TRACING IS CORRUPTED\n"); | |
5824 | printk("# MAY BE MISSING FUNCTION EVENTS\n"); | |
5825 | } | |
5826 | ||
cf586b61 FW |
5827 | if (disable_tracing) |
5828 | ftrace_kill(); | |
3f5a54e3 | 5829 | |
38dbe0b1 | 5830 | /* Simulate the iterator */ |
955b61e5 JW |
5831 | trace_init_global_iter(&iter); |
5832 | ||
d769041f | 5833 | for_each_tracing_cpu(cpu) { |
12883efb | 5834 | atomic_inc(&per_cpu_ptr(iter.tr->trace_buffer.data, cpu)->disabled); |
d769041f SR |
5835 | } |
5836 | ||
cf586b61 FW |
5837 | old_userobj = trace_flags & TRACE_ITER_SYM_USEROBJ; |
5838 | ||
b54d3de9 TE |
5839 | /* don't look at user memory in panic mode */ |
5840 | trace_flags &= ~TRACE_ITER_SYM_USEROBJ; | |
5841 | ||
cecbca96 FW |
5842 | switch (oops_dump_mode) { |
5843 | case DUMP_ALL: | |
ae3b5093 | 5844 | iter.cpu_file = RING_BUFFER_ALL_CPUS; |
cecbca96 FW |
5845 | break; |
5846 | case DUMP_ORIG: | |
5847 | iter.cpu_file = raw_smp_processor_id(); | |
5848 | break; | |
5849 | case DUMP_NONE: | |
5850 | goto out_enable; | |
5851 | default: | |
5852 | printk(KERN_TRACE "Bad dumping mode, switching to all CPUs dump\n"); | |
ae3b5093 | 5853 | iter.cpu_file = RING_BUFFER_ALL_CPUS; |
cecbca96 FW |
5854 | } |
5855 | ||
5856 | printk(KERN_TRACE "Dumping ftrace buffer:\n"); | |
3f5a54e3 SR |
5857 | |
5858 | /* | |
5859 | * We need to stop all tracing on all CPUS to read the | |
5860 | * the next buffer. This is a bit expensive, but is | |
5861 | * not done often. We fill all what we can read, | |
5862 | * and then release the locks again. | |
5863 | */ | |
5864 | ||
3f5a54e3 SR |
5865 | while (!trace_empty(&iter)) { |
5866 | ||
5867 | if (!cnt) | |
5868 | printk(KERN_TRACE "---------------------------------\n"); | |
5869 | ||
5870 | cnt++; | |
5871 | ||
5872 | /* reset all but tr, trace, and overruns */ | |
5873 | memset(&iter.seq, 0, | |
5874 | sizeof(struct trace_iterator) - | |
5875 | offsetof(struct trace_iterator, seq)); | |
5876 | iter.iter_flags |= TRACE_FILE_LAT_FMT; | |
5877 | iter.pos = -1; | |
5878 | ||
955b61e5 | 5879 | if (trace_find_next_entry_inc(&iter) != NULL) { |
74e7ff8c LJ |
5880 | int ret; |
5881 | ||
5882 | ret = print_trace_line(&iter); | |
5883 | if (ret != TRACE_TYPE_NO_CONSUME) | |
5884 | trace_consume(&iter); | |
3f5a54e3 | 5885 | } |
b892e5c8 | 5886 | touch_nmi_watchdog(); |
3f5a54e3 SR |
5887 | |
5888 | trace_printk_seq(&iter.seq); | |
5889 | } | |
5890 | ||
5891 | if (!cnt) | |
5892 | printk(KERN_TRACE " (ftrace buffer empty)\n"); | |
5893 | else | |
5894 | printk(KERN_TRACE "---------------------------------\n"); | |
5895 | ||
cecbca96 | 5896 | out_enable: |
cf586b61 FW |
5897 | /* Re-enable tracing if requested */ |
5898 | if (!disable_tracing) { | |
5899 | trace_flags |= old_userobj; | |
5900 | ||
5901 | for_each_tracing_cpu(cpu) { | |
12883efb | 5902 | atomic_dec(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled); |
cf586b61 FW |
5903 | } |
5904 | tracing_on(); | |
5905 | } | |
5906 | ||
3f5a54e3 | 5907 | out: |
0199c4e6 | 5908 | arch_spin_unlock(&ftrace_dump_lock); |
cd891ae0 | 5909 | local_irq_restore(flags); |
3f5a54e3 SR |
5910 | } |
5911 | ||
cf586b61 | 5912 | /* By default: disable tracing after the dump */ |
cecbca96 | 5913 | void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) |
cf586b61 | 5914 | { |
cecbca96 | 5915 | __ftrace_dump(true, oops_dump_mode); |
cf586b61 | 5916 | } |
a8eecf22 | 5917 | EXPORT_SYMBOL_GPL(ftrace_dump); |
cf586b61 | 5918 | |
3928a8a2 | 5919 | __init static int tracer_alloc_buffers(void) |
bc0c38d1 | 5920 | { |
73c5162a | 5921 | int ring_buf_size; |
9e01c1b7 | 5922 | int ret = -ENOMEM; |
4c11d7ae | 5923 | |
750912fa | 5924 | |
9e01c1b7 RR |
5925 | if (!alloc_cpumask_var(&tracing_buffer_mask, GFP_KERNEL)) |
5926 | goto out; | |
5927 | ||
5928 | if (!alloc_cpumask_var(&tracing_cpumask, GFP_KERNEL)) | |
5929 | goto out_free_buffer_mask; | |
4c11d7ae | 5930 | |
07d777fe SR |
5931 | /* Only allocate trace_printk buffers if a trace_printk exists */ |
5932 | if (__stop___trace_bprintk_fmt != __start___trace_bprintk_fmt) | |
81698831 | 5933 | /* Must be called before global_trace.buffer is allocated */ |
07d777fe SR |
5934 | trace_printk_init_buffers(); |
5935 | ||
73c5162a SR |
5936 | /* To save memory, keep the ring buffer size to its minimum */ |
5937 | if (ring_buffer_expanded) | |
5938 | ring_buf_size = trace_buf_size; | |
5939 | else | |
5940 | ring_buf_size = 1; | |
5941 | ||
9e01c1b7 RR |
5942 | cpumask_copy(tracing_buffer_mask, cpu_possible_mask); |
5943 | cpumask_copy(tracing_cpumask, cpu_all_mask); | |
5944 | ||
2b6080f2 SR |
5945 | raw_spin_lock_init(&global_trace.start_lock); |
5946 | ||
9e01c1b7 | 5947 | /* TODO: make the number of buffers hot pluggable with CPUS */ |
737223fb | 5948 | if (allocate_trace_buffers(&global_trace, ring_buf_size) < 0) { |
3928a8a2 SR |
5949 | printk(KERN_ERR "tracer: failed to allocate ring buffer!\n"); |
5950 | WARN_ON(1); | |
9e01c1b7 | 5951 | goto out_free_cpumask; |
4c11d7ae | 5952 | } |
a7603ff4 | 5953 | |
499e5470 SR |
5954 | if (global_trace.buffer_disabled) |
5955 | tracing_off(); | |
4c11d7ae | 5956 | |
bc0c38d1 SR |
5957 | trace_init_cmdlines(); |
5958 | ||
43a15386 | 5959 | register_tracer(&nop_trace); |
d840f718 | 5960 | |
2b6080f2 SR |
5961 | global_trace.current_trace = &nop_trace; |
5962 | ||
60a11774 SR |
5963 | /* All seems OK, enable tracing */ |
5964 | tracing_disabled = 0; | |
3928a8a2 | 5965 | |
3f5a54e3 SR |
5966 | atomic_notifier_chain_register(&panic_notifier_list, |
5967 | &trace_panic_notifier); | |
5968 | ||
5969 | register_die_notifier(&trace_die_notifier); | |
2fc1dfbe | 5970 | |
ae63b31e SR |
5971 | global_trace.flags = TRACE_ARRAY_FL_GLOBAL; |
5972 | ||
2b6080f2 SR |
5973 | /* Holder for file callbacks */ |
5974 | global_trace.trace_cpu.cpu = RING_BUFFER_ALL_CPUS; | |
5975 | global_trace.trace_cpu.tr = &global_trace; | |
5976 | ||
ae63b31e SR |
5977 | INIT_LIST_HEAD(&global_trace.systems); |
5978 | INIT_LIST_HEAD(&global_trace.events); | |
5979 | list_add(&global_trace.list, &ftrace_trace_arrays); | |
5980 | ||
7bcfaf54 SR |
5981 | while (trace_boot_options) { |
5982 | char *option; | |
5983 | ||
5984 | option = strsep(&trace_boot_options, ","); | |
2b6080f2 | 5985 | trace_set_options(&global_trace, option); |
7bcfaf54 SR |
5986 | } |
5987 | ||
2fc1dfbe | 5988 | return 0; |
3f5a54e3 | 5989 | |
9e01c1b7 | 5990 | out_free_cpumask: |
12883efb SRRH |
5991 | free_percpu(global_trace.trace_buffer.data); |
5992 | #ifdef CONFIG_TRACER_MAX_TRACE | |
5993 | free_percpu(global_trace.max_buffer.data); | |
5994 | #endif | |
9e01c1b7 RR |
5995 | free_cpumask_var(tracing_cpumask); |
5996 | out_free_buffer_mask: | |
5997 | free_cpumask_var(tracing_buffer_mask); | |
5998 | out: | |
5999 | return ret; | |
bc0c38d1 | 6000 | } |
b2821ae6 SR |
6001 | |
6002 | __init static int clear_boot_tracer(void) | |
6003 | { | |
6004 | /* | |
6005 | * The default tracer at boot buffer is an init section. | |
6006 | * This function is called in lateinit. If we did not | |
6007 | * find the boot tracer, then clear it out, to prevent | |
6008 | * later registration from accessing the buffer that is | |
6009 | * about to be freed. | |
6010 | */ | |
6011 | if (!default_bootup_tracer) | |
6012 | return 0; | |
6013 | ||
6014 | printk(KERN_INFO "ftrace bootup tracer '%s' not registered.\n", | |
6015 | default_bootup_tracer); | |
6016 | default_bootup_tracer = NULL; | |
6017 | ||
6018 | return 0; | |
6019 | } | |
6020 | ||
b5ad384e FW |
6021 | early_initcall(tracer_alloc_buffers); |
6022 | fs_initcall(tracer_init_debugfs); | |
b2821ae6 | 6023 | late_initcall(clear_boot_tracer); |