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; |
29f93943 | 121 | int ret = -EINVAL; |
8f31bfe5 LZ |
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 | { | |
c142b15d | 417 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
8ae79a13 SR |
418 | const char *system = filp->private_data; |
419 | struct ftrace_event_call *call; | |
420 | char buf[2]; | |
c142b15d | 421 | int set = 0; |
8ae79a13 SR |
422 | int ret; |
423 | ||
8ae79a13 SR |
424 | mutex_lock(&event_mutex); |
425 | list_for_each_entry(call, &ftrace_events, list) { | |
426 | if (!call->name || !call->regfunc) | |
427 | continue; | |
428 | ||
8f31bfe5 | 429 | if (system && strcmp(call->system, system) != 0) |
8ae79a13 SR |
430 | continue; |
431 | ||
432 | /* | |
433 | * We need to find out if all the events are set | |
434 | * or if all events or cleared, or if we have | |
435 | * a mixture. | |
436 | */ | |
c142b15d LZ |
437 | set |= (1 << !!call->enabled); |
438 | ||
8ae79a13 SR |
439 | /* |
440 | * If we have a mixture, no need to look further. | |
441 | */ | |
c142b15d | 442 | if (set == 3) |
8ae79a13 SR |
443 | break; |
444 | } | |
445 | mutex_unlock(&event_mutex); | |
446 | ||
c142b15d | 447 | buf[0] = set_to_char[set]; |
8ae79a13 | 448 | buf[1] = '\n'; |
8ae79a13 SR |
449 | |
450 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
451 | ||
452 | return ret; | |
453 | } | |
454 | ||
455 | static ssize_t | |
456 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
457 | loff_t *ppos) | |
458 | { | |
459 | const char *system = filp->private_data; | |
460 | unsigned long val; | |
8ae79a13 SR |
461 | char buf[64]; |
462 | ssize_t ret; | |
463 | ||
464 | if (cnt >= sizeof(buf)) | |
465 | return -EINVAL; | |
466 | ||
467 | if (copy_from_user(&buf, ubuf, cnt)) | |
468 | return -EFAULT; | |
469 | ||
470 | buf[cnt] = 0; | |
471 | ||
472 | ret = strict_strtoul(buf, 10, &val); | |
473 | if (ret < 0) | |
474 | return ret; | |
475 | ||
476 | ret = tracing_update_buffers(); | |
477 | if (ret < 0) | |
478 | return ret; | |
479 | ||
8f31bfe5 | 480 | if (val != 0 && val != 1) |
8ae79a13 | 481 | return -EINVAL; |
8ae79a13 | 482 | |
8f31bfe5 | 483 | ret = __ftrace_set_clr_event(NULL, system, NULL, val); |
8ae79a13 | 484 | if (ret) |
8f31bfe5 | 485 | goto out; |
8ae79a13 SR |
486 | |
487 | ret = cnt; | |
488 | ||
8f31bfe5 | 489 | out: |
8ae79a13 SR |
490 | *ppos += cnt; |
491 | ||
492 | return ret; | |
493 | } | |
494 | ||
75db37d2 SR |
495 | extern char *__bad_type_size(void); |
496 | ||
91729ef9 | 497 | #undef FIELD |
156b5f17 | 498 | #define FIELD(type, name) \ |
75db37d2 | 499 | sizeof(type) != sizeof(field.name) ? __bad_type_size() : \ |
cf027f64 TZ |
500 | #type, "common_" #name, offsetof(typeof(field), name), \ |
501 | sizeof(field.name) | |
91729ef9 SR |
502 | |
503 | static int trace_write_header(struct trace_seq *s) | |
504 | { | |
505 | struct trace_entry field; | |
506 | ||
507 | /* struct trace_entry */ | |
508 | return trace_seq_printf(s, | |
ce8eb2bf SR |
509 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" |
510 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
511 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
512 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
513 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
91729ef9 | 514 | "\n", |
89ec0dee | 515 | FIELD(unsigned short, type), |
91729ef9 SR |
516 | FIELD(unsigned char, flags), |
517 | FIELD(unsigned char, preempt_count), | |
518 | FIELD(int, pid), | |
519 | FIELD(int, tgid)); | |
520 | } | |
da4d0302 | 521 | |
981d081e SR |
522 | static ssize_t |
523 | event_format_read(struct file *filp, char __user *ubuf, size_t cnt, | |
524 | loff_t *ppos) | |
525 | { | |
526 | struct ftrace_event_call *call = filp->private_data; | |
527 | struct trace_seq *s; | |
528 | char *buf; | |
529 | int r; | |
530 | ||
c269fc8c TZ |
531 | if (*ppos) |
532 | return 0; | |
533 | ||
981d081e SR |
534 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
535 | if (!s) | |
536 | return -ENOMEM; | |
537 | ||
538 | trace_seq_init(s); | |
539 | ||
c5e4e192 SR |
540 | /* If any of the first writes fail, so will the show_format. */ |
541 | ||
542 | trace_seq_printf(s, "name: %s\n", call->name); | |
543 | trace_seq_printf(s, "ID: %d\n", call->id); | |
544 | trace_seq_printf(s, "format:\n"); | |
91729ef9 SR |
545 | trace_write_header(s); |
546 | ||
981d081e SR |
547 | r = call->show_format(s); |
548 | if (!r) { | |
549 | /* | |
550 | * ug! The format output is bigger than a PAGE!! | |
551 | */ | |
552 | buf = "FORMAT TOO BIG\n"; | |
553 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
554 | buf, strlen(buf)); | |
555 | goto out; | |
556 | } | |
557 | ||
558 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
559 | s->buffer, s->len); | |
560 | out: | |
561 | kfree(s); | |
562 | return r; | |
563 | } | |
564 | ||
23725aee PZ |
565 | static ssize_t |
566 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
567 | { | |
568 | struct ftrace_event_call *call = filp->private_data; | |
569 | struct trace_seq *s; | |
570 | int r; | |
571 | ||
572 | if (*ppos) | |
573 | return 0; | |
574 | ||
575 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
576 | if (!s) | |
577 | return -ENOMEM; | |
578 | ||
579 | trace_seq_init(s); | |
580 | trace_seq_printf(s, "%d\n", call->id); | |
581 | ||
582 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
583 | s->buffer, s->len); | |
584 | kfree(s); | |
585 | return r; | |
586 | } | |
587 | ||
7ce7e424 TZ |
588 | static ssize_t |
589 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
590 | loff_t *ppos) | |
591 | { | |
592 | struct ftrace_event_call *call = filp->private_data; | |
593 | struct trace_seq *s; | |
594 | int r; | |
595 | ||
596 | if (*ppos) | |
597 | return 0; | |
598 | ||
599 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
600 | if (!s) | |
601 | return -ENOMEM; | |
602 | ||
603 | trace_seq_init(s); | |
604 | ||
8b372562 | 605 | print_event_filter(call, s); |
4bda2d51 | 606 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
607 | |
608 | kfree(s); | |
609 | ||
610 | return r; | |
611 | } | |
612 | ||
613 | static ssize_t | |
614 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
615 | loff_t *ppos) | |
616 | { | |
617 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 618 | char *buf; |
7ce7e424 TZ |
619 | int err; |
620 | ||
8b372562 | 621 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
622 | return -EINVAL; |
623 | ||
8b372562 TZ |
624 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
625 | if (!buf) | |
7ce7e424 TZ |
626 | return -ENOMEM; |
627 | ||
8b372562 TZ |
628 | if (copy_from_user(buf, ubuf, cnt)) { |
629 | free_page((unsigned long) buf); | |
630 | return -EFAULT; | |
7ce7e424 | 631 | } |
8b372562 | 632 | buf[cnt] = '\0'; |
7ce7e424 | 633 | |
8b372562 TZ |
634 | err = apply_event_filter(call, buf); |
635 | free_page((unsigned long) buf); | |
636 | if (err < 0) | |
44e9c8b7 | 637 | return err; |
0a19e53c | 638 | |
7ce7e424 TZ |
639 | *ppos += cnt; |
640 | ||
641 | return cnt; | |
642 | } | |
643 | ||
cfb180f3 TZ |
644 | static ssize_t |
645 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
646 | loff_t *ppos) | |
647 | { | |
648 | struct event_subsystem *system = filp->private_data; | |
649 | struct trace_seq *s; | |
650 | int r; | |
651 | ||
652 | if (*ppos) | |
653 | return 0; | |
654 | ||
655 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
656 | if (!s) | |
657 | return -ENOMEM; | |
658 | ||
659 | trace_seq_init(s); | |
660 | ||
8b372562 | 661 | print_subsystem_event_filter(system, s); |
4bda2d51 | 662 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
663 | |
664 | kfree(s); | |
665 | ||
666 | return r; | |
667 | } | |
668 | ||
669 | static ssize_t | |
670 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
671 | loff_t *ppos) | |
672 | { | |
673 | struct event_subsystem *system = filp->private_data; | |
8b372562 | 674 | char *buf; |
cfb180f3 TZ |
675 | int err; |
676 | ||
8b372562 | 677 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
678 | return -EINVAL; |
679 | ||
8b372562 TZ |
680 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
681 | if (!buf) | |
cfb180f3 TZ |
682 | return -ENOMEM; |
683 | ||
8b372562 TZ |
684 | if (copy_from_user(buf, ubuf, cnt)) { |
685 | free_page((unsigned long) buf); | |
686 | return -EFAULT; | |
cfb180f3 | 687 | } |
8b372562 | 688 | buf[cnt] = '\0'; |
cfb180f3 | 689 | |
8b372562 TZ |
690 | err = apply_subsystem_event_filter(system, buf); |
691 | free_page((unsigned long) buf); | |
692 | if (err < 0) | |
44e9c8b7 | 693 | return err; |
cfb180f3 TZ |
694 | |
695 | *ppos += cnt; | |
696 | ||
697 | return cnt; | |
698 | } | |
699 | ||
d1b182a8 SR |
700 | static ssize_t |
701 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
702 | { | |
703 | int (*func)(struct trace_seq *s) = filp->private_data; | |
704 | struct trace_seq *s; | |
705 | int r; | |
706 | ||
707 | if (*ppos) | |
708 | return 0; | |
709 | ||
710 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
711 | if (!s) | |
712 | return -ENOMEM; | |
713 | ||
714 | trace_seq_init(s); | |
715 | ||
716 | func(s); | |
717 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
718 | ||
719 | kfree(s); | |
720 | ||
721 | return r; | |
722 | } | |
723 | ||
b77e38aa SR |
724 | static const struct seq_operations show_event_seq_ops = { |
725 | .start = t_start, | |
726 | .next = t_next, | |
727 | .show = t_show, | |
728 | .stop = t_stop, | |
729 | }; | |
730 | ||
731 | static const struct seq_operations show_set_event_seq_ops = { | |
732 | .start = s_start, | |
733 | .next = s_next, | |
734 | .show = t_show, | |
735 | .stop = t_stop, | |
736 | }; | |
737 | ||
2314c4ae SR |
738 | static const struct file_operations ftrace_avail_fops = { |
739 | .open = ftrace_event_seq_open, | |
740 | .read = seq_read, | |
741 | .llseek = seq_lseek, | |
742 | .release = seq_release, | |
743 | }; | |
744 | ||
b77e38aa SR |
745 | static const struct file_operations ftrace_set_event_fops = { |
746 | .open = ftrace_event_seq_open, | |
747 | .read = seq_read, | |
748 | .write = ftrace_event_write, | |
749 | .llseek = seq_lseek, | |
750 | .release = seq_release, | |
751 | }; | |
752 | ||
1473e441 SR |
753 | static const struct file_operations ftrace_enable_fops = { |
754 | .open = tracing_open_generic, | |
755 | .read = event_enable_read, | |
756 | .write = event_enable_write, | |
757 | }; | |
758 | ||
981d081e SR |
759 | static const struct file_operations ftrace_event_format_fops = { |
760 | .open = tracing_open_generic, | |
761 | .read = event_format_read, | |
762 | }; | |
763 | ||
23725aee PZ |
764 | static const struct file_operations ftrace_event_id_fops = { |
765 | .open = tracing_open_generic, | |
766 | .read = event_id_read, | |
767 | }; | |
768 | ||
7ce7e424 TZ |
769 | static const struct file_operations ftrace_event_filter_fops = { |
770 | .open = tracing_open_generic, | |
771 | .read = event_filter_read, | |
772 | .write = event_filter_write, | |
773 | }; | |
774 | ||
cfb180f3 TZ |
775 | static const struct file_operations ftrace_subsystem_filter_fops = { |
776 | .open = tracing_open_generic, | |
777 | .read = subsystem_filter_read, | |
778 | .write = subsystem_filter_write, | |
779 | }; | |
780 | ||
8ae79a13 SR |
781 | static const struct file_operations ftrace_system_enable_fops = { |
782 | .open = tracing_open_generic, | |
783 | .read = system_enable_read, | |
784 | .write = system_enable_write, | |
785 | }; | |
786 | ||
d1b182a8 SR |
787 | static const struct file_operations ftrace_show_header_fops = { |
788 | .open = tracing_open_generic, | |
789 | .read = show_header, | |
790 | }; | |
791 | ||
1473e441 SR |
792 | static struct dentry *event_trace_events_dir(void) |
793 | { | |
794 | static struct dentry *d_tracer; | |
795 | static struct dentry *d_events; | |
796 | ||
797 | if (d_events) | |
798 | return d_events; | |
799 | ||
800 | d_tracer = tracing_init_dentry(); | |
801 | if (!d_tracer) | |
802 | return NULL; | |
803 | ||
804 | d_events = debugfs_create_dir("events", d_tracer); | |
805 | if (!d_events) | |
806 | pr_warning("Could not create debugfs " | |
807 | "'events' directory\n"); | |
808 | ||
809 | return d_events; | |
810 | } | |
811 | ||
6ecc2d1c SR |
812 | static LIST_HEAD(event_subsystems); |
813 | ||
814 | static struct dentry * | |
815 | event_subsystem_dir(const char *name, struct dentry *d_events) | |
816 | { | |
817 | struct event_subsystem *system; | |
e1112b4d | 818 | struct dentry *entry; |
6ecc2d1c SR |
819 | |
820 | /* First see if we did not already create this dir */ | |
821 | list_for_each_entry(system, &event_subsystems, list) { | |
822 | if (strcmp(system->name, name) == 0) | |
823 | return system->entry; | |
824 | } | |
825 | ||
826 | /* need to create new entry */ | |
827 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
828 | if (!system) { | |
829 | pr_warning("No memory to create event subsystem %s\n", | |
830 | name); | |
831 | return d_events; | |
832 | } | |
833 | ||
834 | system->entry = debugfs_create_dir(name, d_events); | |
835 | if (!system->entry) { | |
836 | pr_warning("Could not create event subsystem %s\n", | |
837 | name); | |
838 | kfree(system); | |
839 | return d_events; | |
840 | } | |
841 | ||
6d723736 SR |
842 | system->name = kstrdup(name, GFP_KERNEL); |
843 | if (!system->name) { | |
844 | debugfs_remove(system->entry); | |
845 | kfree(system); | |
846 | return d_events; | |
847 | } | |
848 | ||
6ecc2d1c SR |
849 | list_add(&system->list, &event_subsystems); |
850 | ||
30e673b2 | 851 | system->filter = NULL; |
cfb180f3 | 852 | |
8b372562 TZ |
853 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
854 | if (!system->filter) { | |
855 | pr_warning("Could not allocate filter for subsystem " | |
856 | "'%s'\n", name); | |
857 | return system->entry; | |
858 | } | |
859 | ||
e1112b4d TZ |
860 | entry = debugfs_create_file("filter", 0644, system->entry, system, |
861 | &ftrace_subsystem_filter_fops); | |
8b372562 TZ |
862 | if (!entry) { |
863 | kfree(system->filter); | |
864 | system->filter = NULL; | |
e1112b4d TZ |
865 | pr_warning("Could not create debugfs " |
866 | "'%s/filter' entry\n", name); | |
8b372562 | 867 | } |
e1112b4d | 868 | |
8ae79a13 SR |
869 | entry = trace_create_file("enable", 0644, system->entry, |
870 | (void *)system->name, | |
871 | &ftrace_system_enable_fops); | |
872 | ||
6ecc2d1c SR |
873 | return system->entry; |
874 | } | |
875 | ||
1473e441 | 876 | static int |
701970b3 SR |
877 | event_create_dir(struct ftrace_event_call *call, struct dentry *d_events, |
878 | const struct file_operations *id, | |
879 | const struct file_operations *enable, | |
880 | const struct file_operations *filter, | |
881 | const struct file_operations *format) | |
1473e441 SR |
882 | { |
883 | struct dentry *entry; | |
fd994989 | 884 | int ret; |
1473e441 | 885 | |
6ecc2d1c SR |
886 | /* |
887 | * If the trace point header did not define TRACE_SYSTEM | |
888 | * then the system would be called "TRACE_SYSTEM". | |
889 | */ | |
6d723736 | 890 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
6ecc2d1c SR |
891 | d_events = event_subsystem_dir(call->system, d_events); |
892 | ||
fd994989 SR |
893 | if (call->raw_init) { |
894 | ret = call->raw_init(); | |
895 | if (ret < 0) { | |
896 | pr_warning("Could not initialize trace point" | |
897 | " events/%s\n", call->name); | |
898 | return ret; | |
899 | } | |
900 | } | |
901 | ||
1473e441 SR |
902 | call->dir = debugfs_create_dir(call->name, d_events); |
903 | if (!call->dir) { | |
904 | pr_warning("Could not create debugfs " | |
905 | "'%s' directory\n", call->name); | |
906 | return -1; | |
907 | } | |
908 | ||
6d723736 SR |
909 | if (call->regfunc) |
910 | entry = trace_create_file("enable", 0644, call->dir, call, | |
701970b3 | 911 | enable); |
1473e441 | 912 | |
6d723736 SR |
913 | if (call->id) |
914 | entry = trace_create_file("id", 0444, call->dir, call, | |
701970b3 | 915 | id); |
23725aee | 916 | |
cf027f64 TZ |
917 | if (call->define_fields) { |
918 | ret = call->define_fields(); | |
919 | if (ret < 0) { | |
920 | pr_warning("Could not initialize trace point" | |
921 | " events/%s\n", call->name); | |
922 | return ret; | |
923 | } | |
6d723736 | 924 | entry = trace_create_file("filter", 0644, call->dir, call, |
701970b3 | 925 | filter); |
cf027f64 TZ |
926 | } |
927 | ||
981d081e SR |
928 | /* A trace may not want to export its format */ |
929 | if (!call->show_format) | |
930 | return 0; | |
931 | ||
6d723736 | 932 | entry = trace_create_file("format", 0444, call->dir, call, |
701970b3 | 933 | format); |
6d723736 SR |
934 | |
935 | return 0; | |
936 | } | |
937 | ||
938 | #define for_each_event(event, start, end) \ | |
939 | for (event = start; \ | |
940 | (unsigned long)event < (unsigned long)end; \ | |
941 | event++) | |
942 | ||
61f919a1 | 943 | #ifdef CONFIG_MODULES |
701970b3 SR |
944 | |
945 | static LIST_HEAD(ftrace_module_file_list); | |
946 | ||
947 | /* | |
948 | * Modules must own their file_operations to keep up with | |
949 | * reference counting. | |
950 | */ | |
951 | struct ftrace_module_file_ops { | |
952 | struct list_head list; | |
953 | struct module *mod; | |
954 | struct file_operations id; | |
955 | struct file_operations enable; | |
956 | struct file_operations format; | |
957 | struct file_operations filter; | |
958 | }; | |
959 | ||
960 | static struct ftrace_module_file_ops * | |
961 | trace_create_file_ops(struct module *mod) | |
962 | { | |
963 | struct ftrace_module_file_ops *file_ops; | |
964 | ||
965 | /* | |
966 | * This is a bit of a PITA. To allow for correct reference | |
967 | * counting, modules must "own" their file_operations. | |
968 | * To do this, we allocate the file operations that will be | |
969 | * used in the event directory. | |
970 | */ | |
971 | ||
972 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
973 | if (!file_ops) | |
974 | return NULL; | |
975 | ||
976 | file_ops->mod = mod; | |
977 | ||
978 | file_ops->id = ftrace_event_id_fops; | |
979 | file_ops->id.owner = mod; | |
980 | ||
981 | file_ops->enable = ftrace_enable_fops; | |
982 | file_ops->enable.owner = mod; | |
983 | ||
984 | file_ops->filter = ftrace_event_filter_fops; | |
985 | file_ops->filter.owner = mod; | |
986 | ||
987 | file_ops->format = ftrace_event_format_fops; | |
988 | file_ops->format.owner = mod; | |
989 | ||
990 | list_add(&file_ops->list, &ftrace_module_file_list); | |
991 | ||
992 | return file_ops; | |
993 | } | |
994 | ||
6d723736 SR |
995 | static void trace_module_add_events(struct module *mod) |
996 | { | |
701970b3 | 997 | struct ftrace_module_file_ops *file_ops = NULL; |
6d723736 SR |
998 | struct ftrace_event_call *call, *start, *end; |
999 | struct dentry *d_events; | |
1000 | ||
1001 | start = mod->trace_events; | |
1002 | end = mod->trace_events + mod->num_trace_events; | |
1003 | ||
1004 | if (start == end) | |
1005 | return; | |
1006 | ||
1007 | d_events = event_trace_events_dir(); | |
1008 | if (!d_events) | |
1009 | return; | |
1010 | ||
1011 | for_each_event(call, start, end) { | |
1012 | /* The linker may leave blanks */ | |
1013 | if (!call->name) | |
1014 | continue; | |
701970b3 SR |
1015 | |
1016 | /* | |
1017 | * This module has events, create file ops for this module | |
1018 | * if not already done. | |
1019 | */ | |
1020 | if (!file_ops) { | |
1021 | file_ops = trace_create_file_ops(mod); | |
1022 | if (!file_ops) | |
1023 | return; | |
1024 | } | |
6d723736 SR |
1025 | call->mod = mod; |
1026 | list_add(&call->list, &ftrace_events); | |
701970b3 SR |
1027 | event_create_dir(call, d_events, |
1028 | &file_ops->id, &file_ops->enable, | |
1029 | &file_ops->filter, &file_ops->format); | |
6d723736 SR |
1030 | } |
1031 | } | |
1032 | ||
1033 | static void trace_module_remove_events(struct module *mod) | |
1034 | { | |
701970b3 | 1035 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1036 | struct ftrace_event_call *call, *p; |
9456f0fa | 1037 | bool found = false; |
6d723736 SR |
1038 | |
1039 | list_for_each_entry_safe(call, p, &ftrace_events, list) { | |
1040 | if (call->mod == mod) { | |
9456f0fa | 1041 | found = true; |
6d723736 SR |
1042 | if (call->enabled) { |
1043 | call->enabled = 0; | |
1044 | call->unregfunc(); | |
1045 | } | |
1046 | if (call->event) | |
1047 | unregister_ftrace_event(call->event); | |
1048 | debugfs_remove_recursive(call->dir); | |
1049 | list_del(&call->list); | |
2df75e41 LZ |
1050 | trace_destroy_fields(call); |
1051 | destroy_preds(call); | |
6d723736 SR |
1052 | } |
1053 | } | |
701970b3 SR |
1054 | |
1055 | /* Now free the file_operations */ | |
1056 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1057 | if (file_ops->mod == mod) | |
1058 | break; | |
1059 | } | |
1060 | if (&file_ops->list != &ftrace_module_file_list) { | |
1061 | list_del(&file_ops->list); | |
1062 | kfree(file_ops); | |
1063 | } | |
9456f0fa SR |
1064 | |
1065 | /* | |
1066 | * It is safest to reset the ring buffer if the module being unloaded | |
1067 | * registered any events. | |
1068 | */ | |
1069 | if (found) | |
1070 | tracing_reset_current_online_cpus(); | |
6d723736 SR |
1071 | } |
1072 | ||
61f919a1 SR |
1073 | static int trace_module_notify(struct notifier_block *self, |
1074 | unsigned long val, void *data) | |
6d723736 SR |
1075 | { |
1076 | struct module *mod = data; | |
1077 | ||
1078 | mutex_lock(&event_mutex); | |
1079 | switch (val) { | |
1080 | case MODULE_STATE_COMING: | |
1081 | trace_module_add_events(mod); | |
1082 | break; | |
1083 | case MODULE_STATE_GOING: | |
1084 | trace_module_remove_events(mod); | |
1085 | break; | |
1086 | } | |
1087 | mutex_unlock(&event_mutex); | |
fd994989 | 1088 | |
1473e441 SR |
1089 | return 0; |
1090 | } | |
61f919a1 SR |
1091 | #else |
1092 | static int trace_module_notify(struct notifier_block *self, | |
1093 | unsigned long val, void *data) | |
1094 | { | |
1095 | return 0; | |
1096 | } | |
1097 | #endif /* CONFIG_MODULES */ | |
1473e441 | 1098 | |
6d723736 SR |
1099 | struct notifier_block trace_module_nb = { |
1100 | .notifier_call = trace_module_notify, | |
1101 | .priority = 0, | |
1102 | }; | |
1103 | ||
a59fd602 SR |
1104 | extern struct ftrace_event_call __start_ftrace_events[]; |
1105 | extern struct ftrace_event_call __stop_ftrace_events[]; | |
1106 | ||
b77e38aa SR |
1107 | static __init int event_trace_init(void) |
1108 | { | |
a59fd602 | 1109 | struct ftrace_event_call *call; |
b77e38aa SR |
1110 | struct dentry *d_tracer; |
1111 | struct dentry *entry; | |
1473e441 | 1112 | struct dentry *d_events; |
6d723736 | 1113 | int ret; |
b77e38aa SR |
1114 | |
1115 | d_tracer = tracing_init_dentry(); | |
1116 | if (!d_tracer) | |
1117 | return 0; | |
1118 | ||
2314c4ae SR |
1119 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
1120 | (void *)&show_event_seq_ops, | |
1121 | &ftrace_avail_fops); | |
1122 | if (!entry) | |
1123 | pr_warning("Could not create debugfs " | |
1124 | "'available_events' entry\n"); | |
1125 | ||
b77e38aa SR |
1126 | entry = debugfs_create_file("set_event", 0644, d_tracer, |
1127 | (void *)&show_set_event_seq_ops, | |
1128 | &ftrace_set_event_fops); | |
1129 | if (!entry) | |
1130 | pr_warning("Could not create debugfs " | |
1131 | "'set_event' entry\n"); | |
1132 | ||
1473e441 SR |
1133 | d_events = event_trace_events_dir(); |
1134 | if (!d_events) | |
1135 | return 0; | |
1136 | ||
d1b182a8 SR |
1137 | /* ring buffer internal formats */ |
1138 | trace_create_file("header_page", 0444, d_events, | |
1139 | ring_buffer_print_page_header, | |
1140 | &ftrace_show_header_fops); | |
1141 | ||
1142 | trace_create_file("header_event", 0444, d_events, | |
1143 | ring_buffer_print_entry_header, | |
1144 | &ftrace_show_header_fops); | |
1145 | ||
8ae79a13 | 1146 | trace_create_file("enable", 0644, d_events, |
8f31bfe5 | 1147 | NULL, &ftrace_system_enable_fops); |
8ae79a13 | 1148 | |
6d723736 | 1149 | for_each_event(call, __start_ftrace_events, __stop_ftrace_events) { |
1473e441 SR |
1150 | /* The linker may leave blanks */ |
1151 | if (!call->name) | |
1152 | continue; | |
a59fd602 | 1153 | list_add(&call->list, &ftrace_events); |
701970b3 SR |
1154 | event_create_dir(call, d_events, &ftrace_event_id_fops, |
1155 | &ftrace_enable_fops, &ftrace_event_filter_fops, | |
1156 | &ftrace_event_format_fops); | |
1473e441 SR |
1157 | } |
1158 | ||
6d723736 SR |
1159 | ret = register_module_notifier(&trace_module_nb); |
1160 | if (!ret) | |
1161 | pr_warning("Failed to register trace events module notifier\n"); | |
1162 | ||
b77e38aa SR |
1163 | return 0; |
1164 | } | |
1165 | fs_initcall(event_trace_init); | |
e6187007 SR |
1166 | |
1167 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1168 | ||
1169 | static DEFINE_SPINLOCK(test_spinlock); | |
1170 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
1171 | static DEFINE_MUTEX(test_mutex); | |
1172 | ||
1173 | static __init void test_work(struct work_struct *dummy) | |
1174 | { | |
1175 | spin_lock(&test_spinlock); | |
1176 | spin_lock_irq(&test_spinlock_irq); | |
1177 | udelay(1); | |
1178 | spin_unlock_irq(&test_spinlock_irq); | |
1179 | spin_unlock(&test_spinlock); | |
1180 | ||
1181 | mutex_lock(&test_mutex); | |
1182 | msleep(1); | |
1183 | mutex_unlock(&test_mutex); | |
1184 | } | |
1185 | ||
1186 | static __init int event_test_thread(void *unused) | |
1187 | { | |
1188 | void *test_malloc; | |
1189 | ||
1190 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
1191 | if (!test_malloc) | |
1192 | pr_info("failed to kmalloc\n"); | |
1193 | ||
1194 | schedule_on_each_cpu(test_work); | |
1195 | ||
1196 | kfree(test_malloc); | |
1197 | ||
1198 | set_current_state(TASK_INTERRUPTIBLE); | |
1199 | while (!kthread_should_stop()) | |
1200 | schedule(); | |
1201 | ||
1202 | return 0; | |
1203 | } | |
1204 | ||
1205 | /* | |
1206 | * Do various things that may trigger events. | |
1207 | */ | |
1208 | static __init void event_test_stuff(void) | |
1209 | { | |
1210 | struct task_struct *test_thread; | |
1211 | ||
1212 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
1213 | msleep(1); | |
1214 | kthread_stop(test_thread); | |
1215 | } | |
1216 | ||
1217 | /* | |
1218 | * For every trace event defined, we will test each trace point separately, | |
1219 | * and then by groups, and finally all trace points. | |
1220 | */ | |
9ea21c1e | 1221 | static __init void event_trace_self_tests(void) |
e6187007 SR |
1222 | { |
1223 | struct ftrace_event_call *call; | |
1224 | struct event_subsystem *system; | |
e6187007 SR |
1225 | int ret; |
1226 | ||
1227 | pr_info("Running tests on trace events:\n"); | |
1228 | ||
1229 | list_for_each_entry(call, &ftrace_events, list) { | |
1230 | ||
1231 | /* Only test those that have a regfunc */ | |
1232 | if (!call->regfunc) | |
1233 | continue; | |
1234 | ||
1235 | pr_info("Testing event %s: ", call->name); | |
1236 | ||
1237 | /* | |
1238 | * If an event is already enabled, someone is using | |
1239 | * it and the self test should not be on. | |
1240 | */ | |
1241 | if (call->enabled) { | |
1242 | pr_warning("Enabled event during self test!\n"); | |
1243 | WARN_ON_ONCE(1); | |
1244 | continue; | |
1245 | } | |
1246 | ||
1247 | call->enabled = 1; | |
1248 | call->regfunc(); | |
1249 | ||
1250 | event_test_stuff(); | |
1251 | ||
1252 | call->unregfunc(); | |
1253 | call->enabled = 0; | |
1254 | ||
1255 | pr_cont("OK\n"); | |
1256 | } | |
1257 | ||
1258 | /* Now test at the sub system level */ | |
1259 | ||
1260 | pr_info("Running tests on trace event systems:\n"); | |
1261 | ||
1262 | list_for_each_entry(system, &event_subsystems, list) { | |
1263 | ||
1264 | /* the ftrace system is special, skip it */ | |
1265 | if (strcmp(system->name, "ftrace") == 0) | |
1266 | continue; | |
1267 | ||
1268 | pr_info("Testing event system %s: ", system->name); | |
1269 | ||
8f31bfe5 | 1270 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1); |
e6187007 SR |
1271 | if (WARN_ON_ONCE(ret)) { |
1272 | pr_warning("error enabling system %s\n", | |
1273 | system->name); | |
1274 | continue; | |
1275 | } | |
1276 | ||
1277 | event_test_stuff(); | |
1278 | ||
8f31bfe5 | 1279 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0); |
e6187007 SR |
1280 | if (WARN_ON_ONCE(ret)) |
1281 | pr_warning("error disabling system %s\n", | |
1282 | system->name); | |
1283 | ||
1284 | pr_cont("OK\n"); | |
1285 | } | |
1286 | ||
1287 | /* Test with all events enabled */ | |
1288 | ||
1289 | pr_info("Running tests on all trace events:\n"); | |
1290 | pr_info("Testing all events: "); | |
1291 | ||
8f31bfe5 | 1292 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1); |
e6187007 | 1293 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 1294 | pr_warning("error enabling all events\n"); |
9ea21c1e | 1295 | return; |
e6187007 SR |
1296 | } |
1297 | ||
1298 | event_test_stuff(); | |
1299 | ||
1300 | /* reset sysname */ | |
8f31bfe5 | 1301 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0); |
e6187007 SR |
1302 | if (WARN_ON_ONCE(ret)) { |
1303 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 1304 | return; |
e6187007 SR |
1305 | } |
1306 | ||
1307 | pr_cont("OK\n"); | |
9ea21c1e SR |
1308 | } |
1309 | ||
1310 | #ifdef CONFIG_FUNCTION_TRACER | |
1311 | ||
1312 | static DEFINE_PER_CPU(atomic_t, test_event_disable); | |
1313 | ||
1314 | static void | |
1315 | function_test_events_call(unsigned long ip, unsigned long parent_ip) | |
1316 | { | |
1317 | struct ring_buffer_event *event; | |
1318 | struct ftrace_entry *entry; | |
1319 | unsigned long flags; | |
1320 | long disabled; | |
1321 | int resched; | |
1322 | int cpu; | |
1323 | int pc; | |
1324 | ||
1325 | pc = preempt_count(); | |
1326 | resched = ftrace_preempt_disable(); | |
1327 | cpu = raw_smp_processor_id(); | |
1328 | disabled = atomic_inc_return(&per_cpu(test_event_disable, cpu)); | |
1329 | ||
1330 | if (disabled != 1) | |
1331 | goto out; | |
1332 | ||
1333 | local_save_flags(flags); | |
1334 | ||
1335 | event = trace_current_buffer_lock_reserve(TRACE_FN, sizeof(*entry), | |
1336 | flags, pc); | |
1337 | if (!event) | |
1338 | goto out; | |
1339 | entry = ring_buffer_event_data(event); | |
1340 | entry->ip = ip; | |
1341 | entry->parent_ip = parent_ip; | |
1342 | ||
cb4764a6 | 1343 | trace_nowake_buffer_unlock_commit(event, flags, pc); |
9ea21c1e SR |
1344 | |
1345 | out: | |
1346 | atomic_dec(&per_cpu(test_event_disable, cpu)); | |
1347 | ftrace_preempt_enable(resched); | |
1348 | } | |
1349 | ||
1350 | static struct ftrace_ops trace_ops __initdata = | |
1351 | { | |
1352 | .func = function_test_events_call, | |
1353 | }; | |
1354 | ||
1355 | static __init void event_trace_self_test_with_function(void) | |
1356 | { | |
1357 | register_ftrace_function(&trace_ops); | |
1358 | pr_info("Running tests again, along with the function tracer\n"); | |
1359 | event_trace_self_tests(); | |
1360 | unregister_ftrace_function(&trace_ops); | |
1361 | } | |
1362 | #else | |
1363 | static __init void event_trace_self_test_with_function(void) | |
1364 | { | |
1365 | } | |
1366 | #endif | |
1367 | ||
1368 | static __init int event_trace_self_tests_init(void) | |
1369 | { | |
1370 | ||
1371 | event_trace_self_tests(); | |
1372 | ||
1373 | event_trace_self_test_with_function(); | |
e6187007 SR |
1374 | |
1375 | return 0; | |
1376 | } | |
1377 | ||
28d20e2d | 1378 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
1379 | |
1380 | #endif |