Commit | Line | Data |
---|---|---|
b77e38aa SR |
1 | /* |
2 | * event tracer | |
3 | * | |
4 | * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> | |
5 | * | |
981d081e SR |
6 | * - Added format output of fields of the trace point. |
7 | * This was based off of work by Tom Zanussi <tzanussi@gmail.com>. | |
8 | * | |
b77e38aa SR |
9 | */ |
10 | ||
e6187007 SR |
11 | #include <linux/workqueue.h> |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/kthread.h> | |
b77e38aa SR |
14 | #include <linux/debugfs.h> |
15 | #include <linux/uaccess.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/ctype.h> | |
e6187007 | 18 | #include <linux/delay.h> |
b77e38aa | 19 | |
91729ef9 | 20 | #include "trace_output.h" |
b77e38aa | 21 | |
b628b3e6 SR |
22 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
23 | ||
20c8928a | 24 | DEFINE_MUTEX(event_mutex); |
11a241a3 | 25 | |
a59fd602 SR |
26 | LIST_HEAD(ftrace_events); |
27 | ||
cf027f64 | 28 | int trace_define_field(struct ftrace_event_call *call, char *type, |
a118e4d1 | 29 | char *name, int offset, int size, int is_signed) |
cf027f64 TZ |
30 | { |
31 | struct ftrace_event_field *field; | |
32 | ||
fe9f57f2 | 33 | field = kzalloc(sizeof(*field), GFP_KERNEL); |
cf027f64 TZ |
34 | if (!field) |
35 | goto err; | |
fe9f57f2 | 36 | |
cf027f64 TZ |
37 | field->name = kstrdup(name, GFP_KERNEL); |
38 | if (!field->name) | |
39 | goto err; | |
fe9f57f2 | 40 | |
cf027f64 TZ |
41 | field->type = kstrdup(type, GFP_KERNEL); |
42 | if (!field->type) | |
43 | goto err; | |
fe9f57f2 | 44 | |
cf027f64 TZ |
45 | field->offset = offset; |
46 | field->size = size; | |
a118e4d1 | 47 | field->is_signed = is_signed; |
cf027f64 TZ |
48 | list_add(&field->link, &call->fields); |
49 | ||
50 | return 0; | |
fe9f57f2 | 51 | |
cf027f64 TZ |
52 | err: |
53 | if (field) { | |
54 | kfree(field->name); | |
55 | kfree(field->type); | |
56 | } | |
57 | kfree(field); | |
fe9f57f2 | 58 | |
cf027f64 TZ |
59 | return -ENOMEM; |
60 | } | |
17c873ec | 61 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 62 | |
2df75e41 LZ |
63 | #ifdef CONFIG_MODULES |
64 | ||
65 | static void trace_destroy_fields(struct ftrace_event_call *call) | |
66 | { | |
67 | struct ftrace_event_field *field, *next; | |
68 | ||
69 | list_for_each_entry_safe(field, next, &call->fields, link) { | |
70 | list_del(&field->link); | |
71 | kfree(field->type); | |
72 | kfree(field->name); | |
73 | kfree(field); | |
74 | } | |
75 | } | |
76 | ||
77 | #endif /* CONFIG_MODULES */ | |
78 | ||
b77e38aa SR |
79 | static void ftrace_clear_events(void) |
80 | { | |
a59fd602 | 81 | struct ftrace_event_call *call; |
b77e38aa | 82 | |
20c8928a | 83 | mutex_lock(&event_mutex); |
a59fd602 | 84 | list_for_each_entry(call, &ftrace_events, list) { |
b77e38aa SR |
85 | |
86 | if (call->enabled) { | |
87 | call->enabled = 0; | |
88 | call->unregfunc(); | |
89 | } | |
b77e38aa | 90 | } |
20c8928a | 91 | mutex_unlock(&event_mutex); |
b77e38aa SR |
92 | } |
93 | ||
fd994989 SR |
94 | static void ftrace_event_enable_disable(struct ftrace_event_call *call, |
95 | int enable) | |
96 | { | |
97 | ||
98 | switch (enable) { | |
99 | case 0: | |
100 | if (call->enabled) { | |
101 | call->enabled = 0; | |
102 | call->unregfunc(); | |
103 | } | |
fd994989 SR |
104 | break; |
105 | case 1: | |
da4d0302 | 106 | if (!call->enabled) { |
fd994989 SR |
107 | call->enabled = 1; |
108 | call->regfunc(); | |
109 | } | |
fd994989 SR |
110 | break; |
111 | } | |
112 | } | |
113 | ||
8f31bfe5 LZ |
114 | /* |
115 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
116 | */ | |
117 | static int __ftrace_set_clr_event(const char *match, const char *sub, | |
118 | const char *event, int set) | |
b77e38aa | 119 | { |
a59fd602 | 120 | struct ftrace_event_call *call; |
8f31bfe5 LZ |
121 | int ret; |
122 | ||
123 | mutex_lock(&event_mutex); | |
124 | list_for_each_entry(call, &ftrace_events, list) { | |
125 | ||
126 | if (!call->name || !call->regfunc) | |
127 | continue; | |
128 | ||
129 | if (match && | |
130 | strcmp(match, call->name) != 0 && | |
131 | strcmp(match, call->system) != 0) | |
132 | continue; | |
133 | ||
134 | if (sub && strcmp(sub, call->system) != 0) | |
135 | continue; | |
136 | ||
137 | if (event && strcmp(event, call->name) != 0) | |
138 | continue; | |
139 | ||
140 | ftrace_event_enable_disable(call, set); | |
141 | ||
142 | ret = 0; | |
143 | } | |
144 | mutex_unlock(&event_mutex); | |
145 | ||
146 | return ret; | |
147 | } | |
148 | ||
149 | static int ftrace_set_clr_event(char *buf, int set) | |
150 | { | |
b628b3e6 | 151 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
152 | |
153 | /* | |
154 | * The buf format can be <subsystem>:<event-name> | |
155 | * *:<event-name> means any event by that name. | |
156 | * :<event-name> is the same. | |
157 | * | |
158 | * <subsystem>:* means all events in that subsystem | |
159 | * <subsystem>: means the same. | |
160 | * | |
161 | * <name> (no ':') means all events in a subsystem with | |
162 | * the name <name> or any event that matches <name> | |
163 | */ | |
164 | ||
165 | match = strsep(&buf, ":"); | |
166 | if (buf) { | |
167 | sub = match; | |
168 | event = buf; | |
169 | match = NULL; | |
170 | ||
171 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
172 | sub = NULL; | |
173 | if (!strlen(event) || strcmp(event, "*") == 0) | |
174 | event = NULL; | |
175 | } | |
b77e38aa | 176 | |
8f31bfe5 | 177 | return __ftrace_set_clr_event(match, sub, event, set); |
b77e38aa SR |
178 | } |
179 | ||
180 | /* 128 should be much more than enough */ | |
181 | #define EVENT_BUF_SIZE 127 | |
182 | ||
183 | static ssize_t | |
184 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
185 | size_t cnt, loff_t *ppos) | |
186 | { | |
187 | size_t read = 0; | |
188 | int i, set = 1; | |
189 | ssize_t ret; | |
190 | char *buf; | |
191 | char ch; | |
192 | ||
193 | if (!cnt || cnt < 0) | |
194 | return 0; | |
195 | ||
1852fcce SR |
196 | ret = tracing_update_buffers(); |
197 | if (ret < 0) | |
198 | return ret; | |
199 | ||
b77e38aa SR |
200 | ret = get_user(ch, ubuf++); |
201 | if (ret) | |
202 | return ret; | |
203 | read++; | |
204 | cnt--; | |
205 | ||
206 | /* skip white space */ | |
207 | while (cnt && isspace(ch)) { | |
208 | ret = get_user(ch, ubuf++); | |
209 | if (ret) | |
210 | return ret; | |
211 | read++; | |
212 | cnt--; | |
213 | } | |
214 | ||
215 | /* Only white space found? */ | |
216 | if (isspace(ch)) { | |
217 | file->f_pos += read; | |
218 | ret = read; | |
219 | return ret; | |
220 | } | |
221 | ||
222 | buf = kmalloc(EVENT_BUF_SIZE+1, GFP_KERNEL); | |
223 | if (!buf) | |
224 | return -ENOMEM; | |
225 | ||
226 | if (cnt > EVENT_BUF_SIZE) | |
227 | cnt = EVENT_BUF_SIZE; | |
228 | ||
229 | i = 0; | |
230 | while (cnt && !isspace(ch)) { | |
231 | if (!i && ch == '!') | |
232 | set = 0; | |
233 | else | |
234 | buf[i++] = ch; | |
235 | ||
236 | ret = get_user(ch, ubuf++); | |
237 | if (ret) | |
238 | goto out_free; | |
239 | read++; | |
240 | cnt--; | |
241 | } | |
242 | buf[i] = 0; | |
243 | ||
244 | file->f_pos += read; | |
245 | ||
246 | ret = ftrace_set_clr_event(buf, set); | |
247 | if (ret) | |
248 | goto out_free; | |
249 | ||
250 | ret = read; | |
251 | ||
252 | out_free: | |
253 | kfree(buf); | |
254 | ||
255 | return ret; | |
256 | } | |
257 | ||
258 | static void * | |
259 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
260 | { | |
a59fd602 SR |
261 | struct list_head *list = m->private; |
262 | struct ftrace_event_call *call; | |
b77e38aa SR |
263 | |
264 | (*pos)++; | |
265 | ||
40e26815 | 266 | for (;;) { |
a59fd602 | 267 | if (list == &ftrace_events) |
40e26815 SR |
268 | return NULL; |
269 | ||
a59fd602 SR |
270 | call = list_entry(list, struct ftrace_event_call, list); |
271 | ||
40e26815 SR |
272 | /* |
273 | * The ftrace subsystem is for showing formats only. | |
274 | * They can not be enabled or disabled via the event files. | |
275 | */ | |
276 | if (call->regfunc) | |
277 | break; | |
278 | ||
a59fd602 | 279 | list = list->next; |
40e26815 | 280 | } |
b77e38aa | 281 | |
a59fd602 | 282 | m->private = list->next; |
b77e38aa SR |
283 | |
284 | return call; | |
285 | } | |
286 | ||
287 | static void *t_start(struct seq_file *m, loff_t *pos) | |
288 | { | |
20c8928a LZ |
289 | mutex_lock(&event_mutex); |
290 | if (*pos == 0) | |
291 | m->private = ftrace_events.next; | |
b77e38aa SR |
292 | return t_next(m, NULL, pos); |
293 | } | |
294 | ||
295 | static void * | |
296 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
297 | { | |
a59fd602 SR |
298 | struct list_head *list = m->private; |
299 | struct ftrace_event_call *call; | |
b77e38aa SR |
300 | |
301 | (*pos)++; | |
302 | ||
303 | retry: | |
a59fd602 | 304 | if (list == &ftrace_events) |
b77e38aa SR |
305 | return NULL; |
306 | ||
a59fd602 SR |
307 | call = list_entry(list, struct ftrace_event_call, list); |
308 | ||
b77e38aa | 309 | if (!call->enabled) { |
a59fd602 | 310 | list = list->next; |
b77e38aa SR |
311 | goto retry; |
312 | } | |
313 | ||
a59fd602 | 314 | m->private = list->next; |
b77e38aa SR |
315 | |
316 | return call; | |
317 | } | |
318 | ||
319 | static void *s_start(struct seq_file *m, loff_t *pos) | |
320 | { | |
20c8928a LZ |
321 | mutex_lock(&event_mutex); |
322 | if (*pos == 0) | |
323 | m->private = ftrace_events.next; | |
b77e38aa SR |
324 | return s_next(m, NULL, pos); |
325 | } | |
326 | ||
327 | static int t_show(struct seq_file *m, void *v) | |
328 | { | |
329 | struct ftrace_event_call *call = v; | |
330 | ||
b628b3e6 SR |
331 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
332 | seq_printf(m, "%s:", call->system); | |
b77e38aa SR |
333 | seq_printf(m, "%s\n", call->name); |
334 | ||
335 | return 0; | |
336 | } | |
337 | ||
338 | static void t_stop(struct seq_file *m, void *p) | |
339 | { | |
20c8928a | 340 | mutex_unlock(&event_mutex); |
b77e38aa SR |
341 | } |
342 | ||
343 | static int | |
344 | ftrace_event_seq_open(struct inode *inode, struct file *file) | |
345 | { | |
b77e38aa SR |
346 | const struct seq_operations *seq_ops; |
347 | ||
348 | if ((file->f_mode & FMODE_WRITE) && | |
349 | !(file->f_flags & O_APPEND)) | |
350 | ftrace_clear_events(); | |
351 | ||
352 | seq_ops = inode->i_private; | |
20c8928a | 353 | return seq_open(file, seq_ops); |
b77e38aa SR |
354 | } |
355 | ||
1473e441 SR |
356 | static ssize_t |
357 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
358 | loff_t *ppos) | |
359 | { | |
360 | struct ftrace_event_call *call = filp->private_data; | |
361 | char *buf; | |
362 | ||
da4d0302 | 363 | if (call->enabled) |
1473e441 SR |
364 | buf = "1\n"; |
365 | else | |
366 | buf = "0\n"; | |
367 | ||
368 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
369 | } | |
370 | ||
371 | static ssize_t | |
372 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
373 | loff_t *ppos) | |
374 | { | |
375 | struct ftrace_event_call *call = filp->private_data; | |
376 | char buf[64]; | |
377 | unsigned long val; | |
378 | int ret; | |
379 | ||
380 | if (cnt >= sizeof(buf)) | |
381 | return -EINVAL; | |
382 | ||
383 | if (copy_from_user(&buf, ubuf, cnt)) | |
384 | return -EFAULT; | |
385 | ||
386 | buf[cnt] = 0; | |
387 | ||
388 | ret = strict_strtoul(buf, 10, &val); | |
389 | if (ret < 0) | |
390 | return ret; | |
391 | ||
1852fcce SR |
392 | ret = tracing_update_buffers(); |
393 | if (ret < 0) | |
394 | return ret; | |
395 | ||
1473e441 SR |
396 | switch (val) { |
397 | case 0: | |
1473e441 | 398 | case 1: |
11a241a3 | 399 | mutex_lock(&event_mutex); |
fd994989 | 400 | ftrace_event_enable_disable(call, val); |
11a241a3 | 401 | mutex_unlock(&event_mutex); |
1473e441 SR |
402 | break; |
403 | ||
404 | default: | |
405 | return -EINVAL; | |
406 | } | |
407 | ||
408 | *ppos += cnt; | |
409 | ||
410 | return cnt; | |
411 | } | |
412 | ||
8ae79a13 SR |
413 | static ssize_t |
414 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
415 | loff_t *ppos) | |
416 | { | |
417 | const char *system = filp->private_data; | |
418 | struct ftrace_event_call *call; | |
419 | char buf[2]; | |
420 | int set = -1; | |
8ae79a13 SR |
421 | int ret; |
422 | ||
8ae79a13 SR |
423 | mutex_lock(&event_mutex); |
424 | list_for_each_entry(call, &ftrace_events, list) { | |
425 | if (!call->name || !call->regfunc) | |
426 | continue; | |
427 | ||
8f31bfe5 | 428 | if (system && strcmp(call->system, system) != 0) |
8ae79a13 SR |
429 | continue; |
430 | ||
431 | /* | |
432 | * We need to find out if all the events are set | |
433 | * or if all events or cleared, or if we have | |
434 | * a mixture. | |
435 | */ | |
436 | if (call->enabled) { | |
437 | switch (set) { | |
438 | case -1: | |
439 | set = 1; | |
440 | break; | |
441 | case 0: | |
442 | set = 2; | |
443 | break; | |
444 | } | |
445 | } else { | |
446 | switch (set) { | |
447 | case -1: | |
448 | set = 0; | |
449 | break; | |
450 | case 1: | |
451 | set = 2; | |
452 | break; | |
453 | } | |
454 | } | |
455 | /* | |
456 | * If we have a mixture, no need to look further. | |
457 | */ | |
458 | if (set == 2) | |
459 | break; | |
460 | } | |
461 | mutex_unlock(&event_mutex); | |
462 | ||
463 | buf[1] = '\n'; | |
464 | switch (set) { | |
465 | case 0: | |
466 | buf[0] = '0'; | |
467 | break; | |
468 | case 1: | |
469 | buf[0] = '1'; | |
470 | break; | |
471 | case 2: | |
472 | buf[0] = 'X'; | |
473 | break; | |
474 | default: | |
475 | buf[0] = '?'; | |
476 | } | |
477 | ||
478 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
479 | ||
480 | return ret; | |
481 | } | |
482 | ||
483 | static ssize_t | |
484 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
485 | loff_t *ppos) | |
486 | { | |
487 | const char *system = filp->private_data; | |
488 | unsigned long val; | |
8ae79a13 SR |
489 | char buf[64]; |
490 | ssize_t ret; | |
491 | ||
492 | if (cnt >= sizeof(buf)) | |
493 | return -EINVAL; | |
494 | ||
495 | if (copy_from_user(&buf, ubuf, cnt)) | |
496 | return -EFAULT; | |
497 | ||
498 | buf[cnt] = 0; | |
499 | ||
500 | ret = strict_strtoul(buf, 10, &val); | |
501 | if (ret < 0) | |
502 | return ret; | |
503 | ||
504 | ret = tracing_update_buffers(); | |
505 | if (ret < 0) | |
506 | return ret; | |
507 | ||
8f31bfe5 | 508 | if (val != 0 && val != 1) |
8ae79a13 | 509 | return -EINVAL; |
8ae79a13 | 510 | |
8f31bfe5 | 511 | ret = __ftrace_set_clr_event(NULL, system, NULL, val); |
8ae79a13 | 512 | if (ret) |
8f31bfe5 | 513 | goto out; |
8ae79a13 SR |
514 | |
515 | ret = cnt; | |
516 | ||
8f31bfe5 | 517 | out: |
8ae79a13 SR |
518 | *ppos += cnt; |
519 | ||
520 | return ret; | |
521 | } | |
522 | ||
75db37d2 SR |
523 | extern char *__bad_type_size(void); |
524 | ||
91729ef9 | 525 | #undef FIELD |
156b5f17 | 526 | #define FIELD(type, name) \ |
75db37d2 | 527 | sizeof(type) != sizeof(field.name) ? __bad_type_size() : \ |
cf027f64 TZ |
528 | #type, "common_" #name, offsetof(typeof(field), name), \ |
529 | sizeof(field.name) | |
91729ef9 SR |
530 | |
531 | static int trace_write_header(struct trace_seq *s) | |
532 | { | |
533 | struct trace_entry field; | |
534 | ||
535 | /* struct trace_entry */ | |
536 | return trace_seq_printf(s, | |
ce8eb2bf SR |
537 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" |
538 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
539 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
540 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
541 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
91729ef9 | 542 | "\n", |
89ec0dee | 543 | FIELD(unsigned short, type), |
91729ef9 SR |
544 | FIELD(unsigned char, flags), |
545 | FIELD(unsigned char, preempt_count), | |
546 | FIELD(int, pid), | |
547 | FIELD(int, tgid)); | |
548 | } | |
da4d0302 | 549 | |
981d081e SR |
550 | static ssize_t |
551 | event_format_read(struct file *filp, char __user *ubuf, size_t cnt, | |
552 | loff_t *ppos) | |
553 | { | |
554 | struct ftrace_event_call *call = filp->private_data; | |
555 | struct trace_seq *s; | |
556 | char *buf; | |
557 | int r; | |
558 | ||
c269fc8c TZ |
559 | if (*ppos) |
560 | return 0; | |
561 | ||
981d081e SR |
562 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
563 | if (!s) | |
564 | return -ENOMEM; | |
565 | ||
566 | trace_seq_init(s); | |
567 | ||
c5e4e192 SR |
568 | /* If any of the first writes fail, so will the show_format. */ |
569 | ||
570 | trace_seq_printf(s, "name: %s\n", call->name); | |
571 | trace_seq_printf(s, "ID: %d\n", call->id); | |
572 | trace_seq_printf(s, "format:\n"); | |
91729ef9 SR |
573 | trace_write_header(s); |
574 | ||
981d081e SR |
575 | r = call->show_format(s); |
576 | if (!r) { | |
577 | /* | |
578 | * ug! The format output is bigger than a PAGE!! | |
579 | */ | |
580 | buf = "FORMAT TOO BIG\n"; | |
581 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
582 | buf, strlen(buf)); | |
583 | goto out; | |
584 | } | |
585 | ||
586 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
587 | s->buffer, s->len); | |
588 | out: | |
589 | kfree(s); | |
590 | return r; | |
591 | } | |
592 | ||
23725aee PZ |
593 | static ssize_t |
594 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
595 | { | |
596 | struct ftrace_event_call *call = filp->private_data; | |
597 | struct trace_seq *s; | |
598 | int r; | |
599 | ||
600 | if (*ppos) | |
601 | return 0; | |
602 | ||
603 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
604 | if (!s) | |
605 | return -ENOMEM; | |
606 | ||
607 | trace_seq_init(s); | |
608 | trace_seq_printf(s, "%d\n", call->id); | |
609 | ||
610 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
611 | s->buffer, s->len); | |
612 | kfree(s); | |
613 | return r; | |
614 | } | |
615 | ||
7ce7e424 TZ |
616 | static ssize_t |
617 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
618 | loff_t *ppos) | |
619 | { | |
620 | struct ftrace_event_call *call = filp->private_data; | |
621 | struct trace_seq *s; | |
622 | int r; | |
623 | ||
624 | if (*ppos) | |
625 | return 0; | |
626 | ||
627 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
628 | if (!s) | |
629 | return -ENOMEM; | |
630 | ||
631 | trace_seq_init(s); | |
632 | ||
8b372562 | 633 | print_event_filter(call, s); |
4bda2d51 | 634 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
635 | |
636 | kfree(s); | |
637 | ||
638 | return r; | |
639 | } | |
640 | ||
641 | static ssize_t | |
642 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
643 | loff_t *ppos) | |
644 | { | |
645 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 646 | char *buf; |
7ce7e424 TZ |
647 | int err; |
648 | ||
8b372562 | 649 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
650 | return -EINVAL; |
651 | ||
8b372562 TZ |
652 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
653 | if (!buf) | |
7ce7e424 TZ |
654 | return -ENOMEM; |
655 | ||
8b372562 TZ |
656 | if (copy_from_user(buf, ubuf, cnt)) { |
657 | free_page((unsigned long) buf); | |
658 | return -EFAULT; | |
7ce7e424 | 659 | } |
8b372562 | 660 | buf[cnt] = '\0'; |
7ce7e424 | 661 | |
8b372562 TZ |
662 | err = apply_event_filter(call, buf); |
663 | free_page((unsigned long) buf); | |
664 | if (err < 0) | |
44e9c8b7 | 665 | return err; |
0a19e53c | 666 | |
7ce7e424 TZ |
667 | *ppos += cnt; |
668 | ||
669 | return cnt; | |
670 | } | |
671 | ||
cfb180f3 TZ |
672 | static ssize_t |
673 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
674 | loff_t *ppos) | |
675 | { | |
676 | struct event_subsystem *system = filp->private_data; | |
677 | struct trace_seq *s; | |
678 | int r; | |
679 | ||
680 | if (*ppos) | |
681 | return 0; | |
682 | ||
683 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
684 | if (!s) | |
685 | return -ENOMEM; | |
686 | ||
687 | trace_seq_init(s); | |
688 | ||
8b372562 | 689 | print_subsystem_event_filter(system, s); |
4bda2d51 | 690 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
691 | |
692 | kfree(s); | |
693 | ||
694 | return r; | |
695 | } | |
696 | ||
697 | static ssize_t | |
698 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
699 | loff_t *ppos) | |
700 | { | |
701 | struct event_subsystem *system = filp->private_data; | |
8b372562 | 702 | char *buf; |
cfb180f3 TZ |
703 | int err; |
704 | ||
8b372562 | 705 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
706 | return -EINVAL; |
707 | ||
8b372562 TZ |
708 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
709 | if (!buf) | |
cfb180f3 TZ |
710 | return -ENOMEM; |
711 | ||
8b372562 TZ |
712 | if (copy_from_user(buf, ubuf, cnt)) { |
713 | free_page((unsigned long) buf); | |
714 | return -EFAULT; | |
cfb180f3 | 715 | } |
8b372562 | 716 | buf[cnt] = '\0'; |
cfb180f3 | 717 | |
8b372562 TZ |
718 | err = apply_subsystem_event_filter(system, buf); |
719 | free_page((unsigned long) buf); | |
720 | if (err < 0) | |
44e9c8b7 | 721 | return err; |
cfb180f3 TZ |
722 | |
723 | *ppos += cnt; | |
724 | ||
725 | return cnt; | |
726 | } | |
727 | ||
d1b182a8 SR |
728 | static ssize_t |
729 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
730 | { | |
731 | int (*func)(struct trace_seq *s) = filp->private_data; | |
732 | struct trace_seq *s; | |
733 | int r; | |
734 | ||
735 | if (*ppos) | |
736 | return 0; | |
737 | ||
738 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
739 | if (!s) | |
740 | return -ENOMEM; | |
741 | ||
742 | trace_seq_init(s); | |
743 | ||
744 | func(s); | |
745 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
746 | ||
747 | kfree(s); | |
748 | ||
749 | return r; | |
750 | } | |
751 | ||
b77e38aa SR |
752 | static const struct seq_operations show_event_seq_ops = { |
753 | .start = t_start, | |
754 | .next = t_next, | |
755 | .show = t_show, | |
756 | .stop = t_stop, | |
757 | }; | |
758 | ||
759 | static const struct seq_operations show_set_event_seq_ops = { | |
760 | .start = s_start, | |
761 | .next = s_next, | |
762 | .show = t_show, | |
763 | .stop = t_stop, | |
764 | }; | |
765 | ||
2314c4ae SR |
766 | static const struct file_operations ftrace_avail_fops = { |
767 | .open = ftrace_event_seq_open, | |
768 | .read = seq_read, | |
769 | .llseek = seq_lseek, | |
770 | .release = seq_release, | |
771 | }; | |
772 | ||
b77e38aa SR |
773 | static const struct file_operations ftrace_set_event_fops = { |
774 | .open = ftrace_event_seq_open, | |
775 | .read = seq_read, | |
776 | .write = ftrace_event_write, | |
777 | .llseek = seq_lseek, | |
778 | .release = seq_release, | |
779 | }; | |
780 | ||
1473e441 SR |
781 | static const struct file_operations ftrace_enable_fops = { |
782 | .open = tracing_open_generic, | |
783 | .read = event_enable_read, | |
784 | .write = event_enable_write, | |
785 | }; | |
786 | ||
981d081e SR |
787 | static const struct file_operations ftrace_event_format_fops = { |
788 | .open = tracing_open_generic, | |
789 | .read = event_format_read, | |
790 | }; | |
791 | ||
23725aee PZ |
792 | static const struct file_operations ftrace_event_id_fops = { |
793 | .open = tracing_open_generic, | |
794 | .read = event_id_read, | |
795 | }; | |
796 | ||
7ce7e424 TZ |
797 | static const struct file_operations ftrace_event_filter_fops = { |
798 | .open = tracing_open_generic, | |
799 | .read = event_filter_read, | |
800 | .write = event_filter_write, | |
801 | }; | |
802 | ||
cfb180f3 TZ |
803 | static const struct file_operations ftrace_subsystem_filter_fops = { |
804 | .open = tracing_open_generic, | |
805 | .read = subsystem_filter_read, | |
806 | .write = subsystem_filter_write, | |
807 | }; | |
808 | ||
8ae79a13 SR |
809 | static const struct file_operations ftrace_system_enable_fops = { |
810 | .open = tracing_open_generic, | |
811 | .read = system_enable_read, | |
812 | .write = system_enable_write, | |
813 | }; | |
814 | ||
d1b182a8 SR |
815 | static const struct file_operations ftrace_show_header_fops = { |
816 | .open = tracing_open_generic, | |
817 | .read = show_header, | |
818 | }; | |
819 | ||
1473e441 SR |
820 | static struct dentry *event_trace_events_dir(void) |
821 | { | |
822 | static struct dentry *d_tracer; | |
823 | static struct dentry *d_events; | |
824 | ||
825 | if (d_events) | |
826 | return d_events; | |
827 | ||
828 | d_tracer = tracing_init_dentry(); | |
829 | if (!d_tracer) | |
830 | return NULL; | |
831 | ||
832 | d_events = debugfs_create_dir("events", d_tracer); | |
833 | if (!d_events) | |
834 | pr_warning("Could not create debugfs " | |
835 | "'events' directory\n"); | |
836 | ||
837 | return d_events; | |
838 | } | |
839 | ||
6ecc2d1c SR |
840 | static LIST_HEAD(event_subsystems); |
841 | ||
842 | static struct dentry * | |
843 | event_subsystem_dir(const char *name, struct dentry *d_events) | |
844 | { | |
845 | struct event_subsystem *system; | |
e1112b4d | 846 | struct dentry *entry; |
6ecc2d1c SR |
847 | |
848 | /* First see if we did not already create this dir */ | |
849 | list_for_each_entry(system, &event_subsystems, list) { | |
850 | if (strcmp(system->name, name) == 0) | |
851 | return system->entry; | |
852 | } | |
853 | ||
854 | /* need to create new entry */ | |
855 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
856 | if (!system) { | |
857 | pr_warning("No memory to create event subsystem %s\n", | |
858 | name); | |
859 | return d_events; | |
860 | } | |
861 | ||
862 | system->entry = debugfs_create_dir(name, d_events); | |
863 | if (!system->entry) { | |
864 | pr_warning("Could not create event subsystem %s\n", | |
865 | name); | |
866 | kfree(system); | |
867 | return d_events; | |
868 | } | |
869 | ||
6d723736 SR |
870 | system->name = kstrdup(name, GFP_KERNEL); |
871 | if (!system->name) { | |
872 | debugfs_remove(system->entry); | |
873 | kfree(system); | |
874 | return d_events; | |
875 | } | |
876 | ||
6ecc2d1c SR |
877 | list_add(&system->list, &event_subsystems); |
878 | ||
30e673b2 | 879 | system->filter = NULL; |
cfb180f3 | 880 | |
8b372562 TZ |
881 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
882 | if (!system->filter) { | |
883 | pr_warning("Could not allocate filter for subsystem " | |
884 | "'%s'\n", name); | |
885 | return system->entry; | |
886 | } | |
887 | ||
e1112b4d TZ |
888 | entry = debugfs_create_file("filter", 0644, system->entry, system, |
889 | &ftrace_subsystem_filter_fops); | |
8b372562 TZ |
890 | if (!entry) { |
891 | kfree(system->filter); | |
892 | system->filter = NULL; | |
e1112b4d TZ |
893 | pr_warning("Could not create debugfs " |
894 | "'%s/filter' entry\n", name); | |
8b372562 | 895 | } |
e1112b4d | 896 | |
8ae79a13 SR |
897 | entry = trace_create_file("enable", 0644, system->entry, |
898 | (void *)system->name, | |
899 | &ftrace_system_enable_fops); | |
900 | ||
6ecc2d1c SR |
901 | return system->entry; |
902 | } | |
903 | ||
1473e441 | 904 | static int |
701970b3 SR |
905 | event_create_dir(struct ftrace_event_call *call, struct dentry *d_events, |
906 | const struct file_operations *id, | |
907 | const struct file_operations *enable, | |
908 | const struct file_operations *filter, | |
909 | const struct file_operations *format) | |
1473e441 SR |
910 | { |
911 | struct dentry *entry; | |
fd994989 | 912 | int ret; |
1473e441 | 913 | |
6ecc2d1c SR |
914 | /* |
915 | * If the trace point header did not define TRACE_SYSTEM | |
916 | * then the system would be called "TRACE_SYSTEM". | |
917 | */ | |
6d723736 | 918 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
6ecc2d1c SR |
919 | d_events = event_subsystem_dir(call->system, d_events); |
920 | ||
fd994989 SR |
921 | if (call->raw_init) { |
922 | ret = call->raw_init(); | |
923 | if (ret < 0) { | |
924 | pr_warning("Could not initialize trace point" | |
925 | " events/%s\n", call->name); | |
926 | return ret; | |
927 | } | |
928 | } | |
929 | ||
1473e441 SR |
930 | call->dir = debugfs_create_dir(call->name, d_events); |
931 | if (!call->dir) { | |
932 | pr_warning("Could not create debugfs " | |
933 | "'%s' directory\n", call->name); | |
934 | return -1; | |
935 | } | |
936 | ||
6d723736 SR |
937 | if (call->regfunc) |
938 | entry = trace_create_file("enable", 0644, call->dir, call, | |
701970b3 | 939 | enable); |
1473e441 | 940 | |
6d723736 SR |
941 | if (call->id) |
942 | entry = trace_create_file("id", 0444, call->dir, call, | |
701970b3 | 943 | id); |
23725aee | 944 | |
cf027f64 TZ |
945 | if (call->define_fields) { |
946 | ret = call->define_fields(); | |
947 | if (ret < 0) { | |
948 | pr_warning("Could not initialize trace point" | |
949 | " events/%s\n", call->name); | |
950 | return ret; | |
951 | } | |
6d723736 | 952 | entry = trace_create_file("filter", 0644, call->dir, call, |
701970b3 | 953 | filter); |
cf027f64 TZ |
954 | } |
955 | ||
981d081e SR |
956 | /* A trace may not want to export its format */ |
957 | if (!call->show_format) | |
958 | return 0; | |
959 | ||
6d723736 | 960 | entry = trace_create_file("format", 0444, call->dir, call, |
701970b3 | 961 | format); |
6d723736 SR |
962 | |
963 | return 0; | |
964 | } | |
965 | ||
966 | #define for_each_event(event, start, end) \ | |
967 | for (event = start; \ | |
968 | (unsigned long)event < (unsigned long)end; \ | |
969 | event++) | |
970 | ||
61f919a1 | 971 | #ifdef CONFIG_MODULES |
701970b3 SR |
972 | |
973 | static LIST_HEAD(ftrace_module_file_list); | |
974 | ||
975 | /* | |
976 | * Modules must own their file_operations to keep up with | |
977 | * reference counting. | |
978 | */ | |
979 | struct ftrace_module_file_ops { | |
980 | struct list_head list; | |
981 | struct module *mod; | |
982 | struct file_operations id; | |
983 | struct file_operations enable; | |
984 | struct file_operations format; | |
985 | struct file_operations filter; | |
986 | }; | |
987 | ||
988 | static struct ftrace_module_file_ops * | |
989 | trace_create_file_ops(struct module *mod) | |
990 | { | |
991 | struct ftrace_module_file_ops *file_ops; | |
992 | ||
993 | /* | |
994 | * This is a bit of a PITA. To allow for correct reference | |
995 | * counting, modules must "own" their file_operations. | |
996 | * To do this, we allocate the file operations that will be | |
997 | * used in the event directory. | |
998 | */ | |
999 | ||
1000 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1001 | if (!file_ops) | |
1002 | return NULL; | |
1003 | ||
1004 | file_ops->mod = mod; | |
1005 | ||
1006 | file_ops->id = ftrace_event_id_fops; | |
1007 | file_ops->id.owner = mod; | |
1008 | ||
1009 | file_ops->enable = ftrace_enable_fops; | |
1010 | file_ops->enable.owner = mod; | |
1011 | ||
1012 | file_ops->filter = ftrace_event_filter_fops; | |
1013 | file_ops->filter.owner = mod; | |
1014 | ||
1015 | file_ops->format = ftrace_event_format_fops; | |
1016 | file_ops->format.owner = mod; | |
1017 | ||
1018 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1019 | ||
1020 | return file_ops; | |
1021 | } | |
1022 | ||
6d723736 SR |
1023 | static void trace_module_add_events(struct module *mod) |
1024 | { | |
701970b3 | 1025 | struct ftrace_module_file_ops *file_ops = NULL; |
6d723736 SR |
1026 | struct ftrace_event_call *call, *start, *end; |
1027 | struct dentry *d_events; | |
1028 | ||
1029 | start = mod->trace_events; | |
1030 | end = mod->trace_events + mod->num_trace_events; | |
1031 | ||
1032 | if (start == end) | |
1033 | return; | |
1034 | ||
1035 | d_events = event_trace_events_dir(); | |
1036 | if (!d_events) | |
1037 | return; | |
1038 | ||
1039 | for_each_event(call, start, end) { | |
1040 | /* The linker may leave blanks */ | |
1041 | if (!call->name) | |
1042 | continue; | |
701970b3 SR |
1043 | |
1044 | /* | |
1045 | * This module has events, create file ops for this module | |
1046 | * if not already done. | |
1047 | */ | |
1048 | if (!file_ops) { | |
1049 | file_ops = trace_create_file_ops(mod); | |
1050 | if (!file_ops) | |
1051 | return; | |
1052 | } | |
6d723736 SR |
1053 | call->mod = mod; |
1054 | list_add(&call->list, &ftrace_events); | |
701970b3 SR |
1055 | event_create_dir(call, d_events, |
1056 | &file_ops->id, &file_ops->enable, | |
1057 | &file_ops->filter, &file_ops->format); | |
6d723736 SR |
1058 | } |
1059 | } | |
1060 | ||
1061 | static void trace_module_remove_events(struct module *mod) | |
1062 | { | |
701970b3 | 1063 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1064 | struct ftrace_event_call *call, *p; |
9456f0fa | 1065 | bool found = false; |
6d723736 SR |
1066 | |
1067 | list_for_each_entry_safe(call, p, &ftrace_events, list) { | |
1068 | if (call->mod == mod) { | |
9456f0fa | 1069 | found = true; |
6d723736 SR |
1070 | if (call->enabled) { |
1071 | call->enabled = 0; | |
1072 | call->unregfunc(); | |
1073 | } | |
1074 | if (call->event) | |
1075 | unregister_ftrace_event(call->event); | |
1076 | debugfs_remove_recursive(call->dir); | |
1077 | list_del(&call->list); | |
2df75e41 LZ |
1078 | trace_destroy_fields(call); |
1079 | destroy_preds(call); | |
6d723736 SR |
1080 | } |
1081 | } | |
701970b3 SR |
1082 | |
1083 | /* Now free the file_operations */ | |
1084 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1085 | if (file_ops->mod == mod) | |
1086 | break; | |
1087 | } | |
1088 | if (&file_ops->list != &ftrace_module_file_list) { | |
1089 | list_del(&file_ops->list); | |
1090 | kfree(file_ops); | |
1091 | } | |
9456f0fa SR |
1092 | |
1093 | /* | |
1094 | * It is safest to reset the ring buffer if the module being unloaded | |
1095 | * registered any events. | |
1096 | */ | |
1097 | if (found) | |
1098 | tracing_reset_current_online_cpus(); | |
6d723736 SR |
1099 | } |
1100 | ||
61f919a1 SR |
1101 | static int trace_module_notify(struct notifier_block *self, |
1102 | unsigned long val, void *data) | |
6d723736 SR |
1103 | { |
1104 | struct module *mod = data; | |
1105 | ||
1106 | mutex_lock(&event_mutex); | |
1107 | switch (val) { | |
1108 | case MODULE_STATE_COMING: | |
1109 | trace_module_add_events(mod); | |
1110 | break; | |
1111 | case MODULE_STATE_GOING: | |
1112 | trace_module_remove_events(mod); | |
1113 | break; | |
1114 | } | |
1115 | mutex_unlock(&event_mutex); | |
fd994989 | 1116 | |
1473e441 SR |
1117 | return 0; |
1118 | } | |
61f919a1 SR |
1119 | #else |
1120 | static int trace_module_notify(struct notifier_block *self, | |
1121 | unsigned long val, void *data) | |
1122 | { | |
1123 | return 0; | |
1124 | } | |
1125 | #endif /* CONFIG_MODULES */ | |
1473e441 | 1126 | |
6d723736 SR |
1127 | struct notifier_block trace_module_nb = { |
1128 | .notifier_call = trace_module_notify, | |
1129 | .priority = 0, | |
1130 | }; | |
1131 | ||
a59fd602 SR |
1132 | extern struct ftrace_event_call __start_ftrace_events[]; |
1133 | extern struct ftrace_event_call __stop_ftrace_events[]; | |
1134 | ||
b77e38aa SR |
1135 | static __init int event_trace_init(void) |
1136 | { | |
a59fd602 | 1137 | struct ftrace_event_call *call; |
b77e38aa SR |
1138 | struct dentry *d_tracer; |
1139 | struct dentry *entry; | |
1473e441 | 1140 | struct dentry *d_events; |
6d723736 | 1141 | int ret; |
b77e38aa SR |
1142 | |
1143 | d_tracer = tracing_init_dentry(); | |
1144 | if (!d_tracer) | |
1145 | return 0; | |
1146 | ||
2314c4ae SR |
1147 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
1148 | (void *)&show_event_seq_ops, | |
1149 | &ftrace_avail_fops); | |
1150 | if (!entry) | |
1151 | pr_warning("Could not create debugfs " | |
1152 | "'available_events' entry\n"); | |
1153 | ||
b77e38aa SR |
1154 | entry = debugfs_create_file("set_event", 0644, d_tracer, |
1155 | (void *)&show_set_event_seq_ops, | |
1156 | &ftrace_set_event_fops); | |
1157 | if (!entry) | |
1158 | pr_warning("Could not create debugfs " | |
1159 | "'set_event' entry\n"); | |
1160 | ||
1473e441 SR |
1161 | d_events = event_trace_events_dir(); |
1162 | if (!d_events) | |
1163 | return 0; | |
1164 | ||
d1b182a8 SR |
1165 | /* ring buffer internal formats */ |
1166 | trace_create_file("header_page", 0444, d_events, | |
1167 | ring_buffer_print_page_header, | |
1168 | &ftrace_show_header_fops); | |
1169 | ||
1170 | trace_create_file("header_event", 0444, d_events, | |
1171 | ring_buffer_print_entry_header, | |
1172 | &ftrace_show_header_fops); | |
1173 | ||
8ae79a13 | 1174 | trace_create_file("enable", 0644, d_events, |
8f31bfe5 | 1175 | NULL, &ftrace_system_enable_fops); |
8ae79a13 | 1176 | |
6d723736 | 1177 | for_each_event(call, __start_ftrace_events, __stop_ftrace_events) { |
1473e441 SR |
1178 | /* The linker may leave blanks */ |
1179 | if (!call->name) | |
1180 | continue; | |
a59fd602 | 1181 | list_add(&call->list, &ftrace_events); |
701970b3 SR |
1182 | event_create_dir(call, d_events, &ftrace_event_id_fops, |
1183 | &ftrace_enable_fops, &ftrace_event_filter_fops, | |
1184 | &ftrace_event_format_fops); | |
1473e441 SR |
1185 | } |
1186 | ||
6d723736 SR |
1187 | ret = register_module_notifier(&trace_module_nb); |
1188 | if (!ret) | |
1189 | pr_warning("Failed to register trace events module notifier\n"); | |
1190 | ||
b77e38aa SR |
1191 | return 0; |
1192 | } | |
1193 | fs_initcall(event_trace_init); | |
e6187007 SR |
1194 | |
1195 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1196 | ||
1197 | static DEFINE_SPINLOCK(test_spinlock); | |
1198 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
1199 | static DEFINE_MUTEX(test_mutex); | |
1200 | ||
1201 | static __init void test_work(struct work_struct *dummy) | |
1202 | { | |
1203 | spin_lock(&test_spinlock); | |
1204 | spin_lock_irq(&test_spinlock_irq); | |
1205 | udelay(1); | |
1206 | spin_unlock_irq(&test_spinlock_irq); | |
1207 | spin_unlock(&test_spinlock); | |
1208 | ||
1209 | mutex_lock(&test_mutex); | |
1210 | msleep(1); | |
1211 | mutex_unlock(&test_mutex); | |
1212 | } | |
1213 | ||
1214 | static __init int event_test_thread(void *unused) | |
1215 | { | |
1216 | void *test_malloc; | |
1217 | ||
1218 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
1219 | if (!test_malloc) | |
1220 | pr_info("failed to kmalloc\n"); | |
1221 | ||
1222 | schedule_on_each_cpu(test_work); | |
1223 | ||
1224 | kfree(test_malloc); | |
1225 | ||
1226 | set_current_state(TASK_INTERRUPTIBLE); | |
1227 | while (!kthread_should_stop()) | |
1228 | schedule(); | |
1229 | ||
1230 | return 0; | |
1231 | } | |
1232 | ||
1233 | /* | |
1234 | * Do various things that may trigger events. | |
1235 | */ | |
1236 | static __init void event_test_stuff(void) | |
1237 | { | |
1238 | struct task_struct *test_thread; | |
1239 | ||
1240 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
1241 | msleep(1); | |
1242 | kthread_stop(test_thread); | |
1243 | } | |
1244 | ||
1245 | /* | |
1246 | * For every trace event defined, we will test each trace point separately, | |
1247 | * and then by groups, and finally all trace points. | |
1248 | */ | |
9ea21c1e | 1249 | static __init void event_trace_self_tests(void) |
e6187007 SR |
1250 | { |
1251 | struct ftrace_event_call *call; | |
1252 | struct event_subsystem *system; | |
e6187007 SR |
1253 | int ret; |
1254 | ||
1255 | pr_info("Running tests on trace events:\n"); | |
1256 | ||
1257 | list_for_each_entry(call, &ftrace_events, list) { | |
1258 | ||
1259 | /* Only test those that have a regfunc */ | |
1260 | if (!call->regfunc) | |
1261 | continue; | |
1262 | ||
1263 | pr_info("Testing event %s: ", call->name); | |
1264 | ||
1265 | /* | |
1266 | * If an event is already enabled, someone is using | |
1267 | * it and the self test should not be on. | |
1268 | */ | |
1269 | if (call->enabled) { | |
1270 | pr_warning("Enabled event during self test!\n"); | |
1271 | WARN_ON_ONCE(1); | |
1272 | continue; | |
1273 | } | |
1274 | ||
1275 | call->enabled = 1; | |
1276 | call->regfunc(); | |
1277 | ||
1278 | event_test_stuff(); | |
1279 | ||
1280 | call->unregfunc(); | |
1281 | call->enabled = 0; | |
1282 | ||
1283 | pr_cont("OK\n"); | |
1284 | } | |
1285 | ||
1286 | /* Now test at the sub system level */ | |
1287 | ||
1288 | pr_info("Running tests on trace event systems:\n"); | |
1289 | ||
1290 | list_for_each_entry(system, &event_subsystems, list) { | |
1291 | ||
1292 | /* the ftrace system is special, skip it */ | |
1293 | if (strcmp(system->name, "ftrace") == 0) | |
1294 | continue; | |
1295 | ||
1296 | pr_info("Testing event system %s: ", system->name); | |
1297 | ||
8f31bfe5 | 1298 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1); |
e6187007 SR |
1299 | if (WARN_ON_ONCE(ret)) { |
1300 | pr_warning("error enabling system %s\n", | |
1301 | system->name); | |
1302 | continue; | |
1303 | } | |
1304 | ||
1305 | event_test_stuff(); | |
1306 | ||
8f31bfe5 | 1307 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0); |
e6187007 SR |
1308 | if (WARN_ON_ONCE(ret)) |
1309 | pr_warning("error disabling system %s\n", | |
1310 | system->name); | |
1311 | ||
1312 | pr_cont("OK\n"); | |
1313 | } | |
1314 | ||
1315 | /* Test with all events enabled */ | |
1316 | ||
1317 | pr_info("Running tests on all trace events:\n"); | |
1318 | pr_info("Testing all events: "); | |
1319 | ||
8f31bfe5 | 1320 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1); |
e6187007 | 1321 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 1322 | pr_warning("error enabling all events\n"); |
9ea21c1e | 1323 | return; |
e6187007 SR |
1324 | } |
1325 | ||
1326 | event_test_stuff(); | |
1327 | ||
1328 | /* reset sysname */ | |
8f31bfe5 | 1329 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0); |
e6187007 SR |
1330 | if (WARN_ON_ONCE(ret)) { |
1331 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 1332 | return; |
e6187007 SR |
1333 | } |
1334 | ||
1335 | pr_cont("OK\n"); | |
9ea21c1e SR |
1336 | } |
1337 | ||
1338 | #ifdef CONFIG_FUNCTION_TRACER | |
1339 | ||
1340 | static DEFINE_PER_CPU(atomic_t, test_event_disable); | |
1341 | ||
1342 | static void | |
1343 | function_test_events_call(unsigned long ip, unsigned long parent_ip) | |
1344 | { | |
1345 | struct ring_buffer_event *event; | |
1346 | struct ftrace_entry *entry; | |
1347 | unsigned long flags; | |
1348 | long disabled; | |
1349 | int resched; | |
1350 | int cpu; | |
1351 | int pc; | |
1352 | ||
1353 | pc = preempt_count(); | |
1354 | resched = ftrace_preempt_disable(); | |
1355 | cpu = raw_smp_processor_id(); | |
1356 | disabled = atomic_inc_return(&per_cpu(test_event_disable, cpu)); | |
1357 | ||
1358 | if (disabled != 1) | |
1359 | goto out; | |
1360 | ||
1361 | local_save_flags(flags); | |
1362 | ||
1363 | event = trace_current_buffer_lock_reserve(TRACE_FN, sizeof(*entry), | |
1364 | flags, pc); | |
1365 | if (!event) | |
1366 | goto out; | |
1367 | entry = ring_buffer_event_data(event); | |
1368 | entry->ip = ip; | |
1369 | entry->parent_ip = parent_ip; | |
1370 | ||
cb4764a6 | 1371 | trace_nowake_buffer_unlock_commit(event, flags, pc); |
9ea21c1e SR |
1372 | |
1373 | out: | |
1374 | atomic_dec(&per_cpu(test_event_disable, cpu)); | |
1375 | ftrace_preempt_enable(resched); | |
1376 | } | |
1377 | ||
1378 | static struct ftrace_ops trace_ops __initdata = | |
1379 | { | |
1380 | .func = function_test_events_call, | |
1381 | }; | |
1382 | ||
1383 | static __init void event_trace_self_test_with_function(void) | |
1384 | { | |
1385 | register_ftrace_function(&trace_ops); | |
1386 | pr_info("Running tests again, along with the function tracer\n"); | |
1387 | event_trace_self_tests(); | |
1388 | unregister_ftrace_function(&trace_ops); | |
1389 | } | |
1390 | #else | |
1391 | static __init void event_trace_self_test_with_function(void) | |
1392 | { | |
1393 | } | |
1394 | #endif | |
1395 | ||
1396 | static __init int event_trace_self_tests_init(void) | |
1397 | { | |
1398 | ||
1399 | event_trace_self_tests(); | |
1400 | ||
1401 | event_trace_self_test_with_function(); | |
e6187007 SR |
1402 | |
1403 | return 0; | |
1404 | } | |
1405 | ||
28d20e2d | 1406 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
1407 | |
1408 | #endif |