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 | |
020e5f85 LZ |
20 | #include <asm/setup.h> |
21 | ||
91729ef9 | 22 | #include "trace_output.h" |
b77e38aa | 23 | |
b628b3e6 SR |
24 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
25 | ||
20c8928a | 26 | DEFINE_MUTEX(event_mutex); |
11a241a3 | 27 | |
a59fd602 SR |
28 | LIST_HEAD(ftrace_events); |
29 | ||
540b7b8d | 30 | int trace_define_field(struct ftrace_event_call *call, const char *type, |
43b51ead LZ |
31 | const char *name, int offset, int size, int is_signed, |
32 | int filter_type) | |
cf027f64 TZ |
33 | { |
34 | struct ftrace_event_field *field; | |
35 | ||
fe9f57f2 | 36 | field = kzalloc(sizeof(*field), GFP_KERNEL); |
cf027f64 TZ |
37 | if (!field) |
38 | goto err; | |
fe9f57f2 | 39 | |
cf027f64 TZ |
40 | field->name = kstrdup(name, GFP_KERNEL); |
41 | if (!field->name) | |
42 | goto err; | |
fe9f57f2 | 43 | |
cf027f64 TZ |
44 | field->type = kstrdup(type, GFP_KERNEL); |
45 | if (!field->type) | |
46 | goto err; | |
fe9f57f2 | 47 | |
43b51ead LZ |
48 | if (filter_type == FILTER_OTHER) |
49 | field->filter_type = filter_assign_type(type); | |
50 | else | |
51 | field->filter_type = filter_type; | |
52 | ||
cf027f64 TZ |
53 | field->offset = offset; |
54 | field->size = size; | |
a118e4d1 | 55 | field->is_signed = is_signed; |
aa38e9fc | 56 | |
cf027f64 TZ |
57 | list_add(&field->link, &call->fields); |
58 | ||
59 | return 0; | |
fe9f57f2 | 60 | |
cf027f64 TZ |
61 | err: |
62 | if (field) { | |
63 | kfree(field->name); | |
64 | kfree(field->type); | |
65 | } | |
66 | kfree(field); | |
fe9f57f2 | 67 | |
cf027f64 TZ |
68 | return -ENOMEM; |
69 | } | |
17c873ec | 70 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 71 | |
e647d6b3 LZ |
72 | #define __common_field(type, item) \ |
73 | ret = trace_define_field(call, #type, "common_" #item, \ | |
74 | offsetof(typeof(ent), item), \ | |
75 | sizeof(ent.item), \ | |
43b51ead | 76 | is_signed_type(type), FILTER_OTHER); \ |
e647d6b3 LZ |
77 | if (ret) \ |
78 | return ret; | |
79 | ||
80 | int trace_define_common_fields(struct ftrace_event_call *call) | |
81 | { | |
82 | int ret; | |
83 | struct trace_entry ent; | |
84 | ||
85 | __common_field(unsigned short, type); | |
86 | __common_field(unsigned char, flags); | |
87 | __common_field(unsigned char, preempt_count); | |
88 | __common_field(int, pid); | |
89 | __common_field(int, tgid); | |
90 | ||
91 | return ret; | |
92 | } | |
540b7b8d | 93 | EXPORT_SYMBOL_GPL(trace_define_common_fields); |
e647d6b3 | 94 | |
2df75e41 LZ |
95 | #ifdef CONFIG_MODULES |
96 | ||
97 | static void trace_destroy_fields(struct ftrace_event_call *call) | |
98 | { | |
99 | struct ftrace_event_field *field, *next; | |
100 | ||
101 | list_for_each_entry_safe(field, next, &call->fields, link) { | |
102 | list_del(&field->link); | |
103 | kfree(field->type); | |
104 | kfree(field->name); | |
105 | kfree(field); | |
106 | } | |
107 | } | |
108 | ||
109 | #endif /* CONFIG_MODULES */ | |
110 | ||
fd994989 SR |
111 | static void ftrace_event_enable_disable(struct ftrace_event_call *call, |
112 | int enable) | |
113 | { | |
fd994989 SR |
114 | switch (enable) { |
115 | case 0: | |
116 | if (call->enabled) { | |
117 | call->enabled = 0; | |
b11c53e1 | 118 | tracing_stop_cmdline_record(); |
69fd4f0e | 119 | call->unregfunc(call->data); |
fd994989 | 120 | } |
fd994989 SR |
121 | break; |
122 | case 1: | |
da4d0302 | 123 | if (!call->enabled) { |
fd994989 | 124 | call->enabled = 1; |
b11c53e1 | 125 | tracing_start_cmdline_record(); |
69fd4f0e | 126 | call->regfunc(call->data); |
fd994989 | 127 | } |
fd994989 SR |
128 | break; |
129 | } | |
130 | } | |
131 | ||
0e907c99 Z |
132 | static void ftrace_clear_events(void) |
133 | { | |
134 | struct ftrace_event_call *call; | |
135 | ||
136 | mutex_lock(&event_mutex); | |
137 | list_for_each_entry(call, &ftrace_events, list) { | |
138 | ftrace_event_enable_disable(call, 0); | |
139 | } | |
140 | mutex_unlock(&event_mutex); | |
141 | } | |
142 | ||
8f31bfe5 LZ |
143 | /* |
144 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
145 | */ | |
146 | static int __ftrace_set_clr_event(const char *match, const char *sub, | |
147 | const char *event, int set) | |
b77e38aa | 148 | { |
a59fd602 | 149 | struct ftrace_event_call *call; |
29f93943 | 150 | int ret = -EINVAL; |
8f31bfe5 LZ |
151 | |
152 | mutex_lock(&event_mutex); | |
153 | list_for_each_entry(call, &ftrace_events, list) { | |
154 | ||
155 | if (!call->name || !call->regfunc) | |
156 | continue; | |
157 | ||
158 | if (match && | |
159 | strcmp(match, call->name) != 0 && | |
160 | strcmp(match, call->system) != 0) | |
161 | continue; | |
162 | ||
163 | if (sub && strcmp(sub, call->system) != 0) | |
164 | continue; | |
165 | ||
166 | if (event && strcmp(event, call->name) != 0) | |
167 | continue; | |
168 | ||
169 | ftrace_event_enable_disable(call, set); | |
170 | ||
171 | ret = 0; | |
172 | } | |
173 | mutex_unlock(&event_mutex); | |
174 | ||
175 | return ret; | |
176 | } | |
177 | ||
178 | static int ftrace_set_clr_event(char *buf, int set) | |
179 | { | |
b628b3e6 | 180 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
181 | |
182 | /* | |
183 | * The buf format can be <subsystem>:<event-name> | |
184 | * *:<event-name> means any event by that name. | |
185 | * :<event-name> is the same. | |
186 | * | |
187 | * <subsystem>:* means all events in that subsystem | |
188 | * <subsystem>: means the same. | |
189 | * | |
190 | * <name> (no ':') means all events in a subsystem with | |
191 | * the name <name> or any event that matches <name> | |
192 | */ | |
193 | ||
194 | match = strsep(&buf, ":"); | |
195 | if (buf) { | |
196 | sub = match; | |
197 | event = buf; | |
198 | match = NULL; | |
199 | ||
200 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
201 | sub = NULL; | |
202 | if (!strlen(event) || strcmp(event, "*") == 0) | |
203 | event = NULL; | |
204 | } | |
b77e38aa | 205 | |
8f31bfe5 | 206 | return __ftrace_set_clr_event(match, sub, event, set); |
b77e38aa SR |
207 | } |
208 | ||
4671c794 SR |
209 | /** |
210 | * trace_set_clr_event - enable or disable an event | |
211 | * @system: system name to match (NULL for any system) | |
212 | * @event: event name to match (NULL for all events, within system) | |
213 | * @set: 1 to enable, 0 to disable | |
214 | * | |
215 | * This is a way for other parts of the kernel to enable or disable | |
216 | * event recording. | |
217 | * | |
218 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
219 | * registered events. | |
220 | */ | |
221 | int trace_set_clr_event(const char *system, const char *event, int set) | |
222 | { | |
223 | return __ftrace_set_clr_event(NULL, system, event, set); | |
224 | } | |
225 | ||
b77e38aa SR |
226 | /* 128 should be much more than enough */ |
227 | #define EVENT_BUF_SIZE 127 | |
228 | ||
229 | static ssize_t | |
230 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
231 | size_t cnt, loff_t *ppos) | |
232 | { | |
233 | size_t read = 0; | |
234 | int i, set = 1; | |
235 | ssize_t ret; | |
236 | char *buf; | |
237 | char ch; | |
238 | ||
239 | if (!cnt || cnt < 0) | |
240 | return 0; | |
241 | ||
1852fcce SR |
242 | ret = tracing_update_buffers(); |
243 | if (ret < 0) | |
244 | return ret; | |
245 | ||
b77e38aa SR |
246 | ret = get_user(ch, ubuf++); |
247 | if (ret) | |
248 | return ret; | |
249 | read++; | |
250 | cnt--; | |
251 | ||
252 | /* skip white space */ | |
253 | while (cnt && isspace(ch)) { | |
254 | ret = get_user(ch, ubuf++); | |
255 | if (ret) | |
256 | return ret; | |
257 | read++; | |
258 | cnt--; | |
259 | } | |
260 | ||
261 | /* Only white space found? */ | |
262 | if (isspace(ch)) { | |
263 | file->f_pos += read; | |
264 | ret = read; | |
265 | return ret; | |
266 | } | |
267 | ||
268 | buf = kmalloc(EVENT_BUF_SIZE+1, GFP_KERNEL); | |
269 | if (!buf) | |
270 | return -ENOMEM; | |
271 | ||
272 | if (cnt > EVENT_BUF_SIZE) | |
273 | cnt = EVENT_BUF_SIZE; | |
274 | ||
275 | i = 0; | |
276 | while (cnt && !isspace(ch)) { | |
277 | if (!i && ch == '!') | |
278 | set = 0; | |
279 | else | |
280 | buf[i++] = ch; | |
281 | ||
282 | ret = get_user(ch, ubuf++); | |
283 | if (ret) | |
284 | goto out_free; | |
285 | read++; | |
286 | cnt--; | |
287 | } | |
288 | buf[i] = 0; | |
289 | ||
290 | file->f_pos += read; | |
291 | ||
292 | ret = ftrace_set_clr_event(buf, set); | |
293 | if (ret) | |
294 | goto out_free; | |
295 | ||
296 | ret = read; | |
297 | ||
298 | out_free: | |
299 | kfree(buf); | |
300 | ||
301 | return ret; | |
302 | } | |
303 | ||
304 | static void * | |
305 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
306 | { | |
a59fd602 SR |
307 | struct list_head *list = m->private; |
308 | struct ftrace_event_call *call; | |
b77e38aa SR |
309 | |
310 | (*pos)++; | |
311 | ||
40e26815 | 312 | for (;;) { |
a59fd602 | 313 | if (list == &ftrace_events) |
40e26815 SR |
314 | return NULL; |
315 | ||
a59fd602 SR |
316 | call = list_entry(list, struct ftrace_event_call, list); |
317 | ||
40e26815 SR |
318 | /* |
319 | * The ftrace subsystem is for showing formats only. | |
320 | * They can not be enabled or disabled via the event files. | |
321 | */ | |
322 | if (call->regfunc) | |
323 | break; | |
324 | ||
a59fd602 | 325 | list = list->next; |
40e26815 | 326 | } |
b77e38aa | 327 | |
a59fd602 | 328 | m->private = list->next; |
b77e38aa SR |
329 | |
330 | return call; | |
331 | } | |
332 | ||
333 | static void *t_start(struct seq_file *m, loff_t *pos) | |
334 | { | |
e1c7e2a6 LZ |
335 | struct ftrace_event_call *call = NULL; |
336 | loff_t l; | |
337 | ||
20c8928a | 338 | mutex_lock(&event_mutex); |
e1c7e2a6 LZ |
339 | |
340 | m->private = ftrace_events.next; | |
341 | for (l = 0; l <= *pos; ) { | |
342 | call = t_next(m, NULL, &l); | |
343 | if (!call) | |
344 | break; | |
345 | } | |
346 | return call; | |
b77e38aa SR |
347 | } |
348 | ||
349 | static void * | |
350 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
351 | { | |
a59fd602 SR |
352 | struct list_head *list = m->private; |
353 | struct ftrace_event_call *call; | |
b77e38aa SR |
354 | |
355 | (*pos)++; | |
356 | ||
357 | retry: | |
a59fd602 | 358 | if (list == &ftrace_events) |
b77e38aa SR |
359 | return NULL; |
360 | ||
a59fd602 SR |
361 | call = list_entry(list, struct ftrace_event_call, list); |
362 | ||
b77e38aa | 363 | if (!call->enabled) { |
a59fd602 | 364 | list = list->next; |
b77e38aa SR |
365 | goto retry; |
366 | } | |
367 | ||
a59fd602 | 368 | m->private = list->next; |
b77e38aa SR |
369 | |
370 | return call; | |
371 | } | |
372 | ||
373 | static void *s_start(struct seq_file *m, loff_t *pos) | |
374 | { | |
e1c7e2a6 LZ |
375 | struct ftrace_event_call *call = NULL; |
376 | loff_t l; | |
377 | ||
20c8928a | 378 | mutex_lock(&event_mutex); |
e1c7e2a6 LZ |
379 | |
380 | m->private = ftrace_events.next; | |
381 | for (l = 0; l <= *pos; ) { | |
382 | call = s_next(m, NULL, &l); | |
383 | if (!call) | |
384 | break; | |
385 | } | |
386 | return call; | |
b77e38aa SR |
387 | } |
388 | ||
389 | static int t_show(struct seq_file *m, void *v) | |
390 | { | |
391 | struct ftrace_event_call *call = v; | |
392 | ||
b628b3e6 SR |
393 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
394 | seq_printf(m, "%s:", call->system); | |
b77e38aa SR |
395 | seq_printf(m, "%s\n", call->name); |
396 | ||
397 | return 0; | |
398 | } | |
399 | ||
400 | static void t_stop(struct seq_file *m, void *p) | |
401 | { | |
20c8928a | 402 | mutex_unlock(&event_mutex); |
b77e38aa SR |
403 | } |
404 | ||
405 | static int | |
406 | ftrace_event_seq_open(struct inode *inode, struct file *file) | |
407 | { | |
b77e38aa SR |
408 | const struct seq_operations *seq_ops; |
409 | ||
410 | if ((file->f_mode & FMODE_WRITE) && | |
8650ae32 | 411 | (file->f_flags & O_TRUNC)) |
b77e38aa SR |
412 | ftrace_clear_events(); |
413 | ||
414 | seq_ops = inode->i_private; | |
20c8928a | 415 | return seq_open(file, seq_ops); |
b77e38aa SR |
416 | } |
417 | ||
1473e441 SR |
418 | static ssize_t |
419 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
420 | loff_t *ppos) | |
421 | { | |
422 | struct ftrace_event_call *call = filp->private_data; | |
423 | char *buf; | |
424 | ||
da4d0302 | 425 | if (call->enabled) |
1473e441 SR |
426 | buf = "1\n"; |
427 | else | |
428 | buf = "0\n"; | |
429 | ||
430 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
431 | } | |
432 | ||
433 | static ssize_t | |
434 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
435 | loff_t *ppos) | |
436 | { | |
437 | struct ftrace_event_call *call = filp->private_data; | |
438 | char buf[64]; | |
439 | unsigned long val; | |
440 | int ret; | |
441 | ||
442 | if (cnt >= sizeof(buf)) | |
443 | return -EINVAL; | |
444 | ||
445 | if (copy_from_user(&buf, ubuf, cnt)) | |
446 | return -EFAULT; | |
447 | ||
448 | buf[cnt] = 0; | |
449 | ||
450 | ret = strict_strtoul(buf, 10, &val); | |
451 | if (ret < 0) | |
452 | return ret; | |
453 | ||
1852fcce SR |
454 | ret = tracing_update_buffers(); |
455 | if (ret < 0) | |
456 | return ret; | |
457 | ||
1473e441 SR |
458 | switch (val) { |
459 | case 0: | |
1473e441 | 460 | case 1: |
11a241a3 | 461 | mutex_lock(&event_mutex); |
fd994989 | 462 | ftrace_event_enable_disable(call, val); |
11a241a3 | 463 | mutex_unlock(&event_mutex); |
1473e441 SR |
464 | break; |
465 | ||
466 | default: | |
467 | return -EINVAL; | |
468 | } | |
469 | ||
470 | *ppos += cnt; | |
471 | ||
472 | return cnt; | |
473 | } | |
474 | ||
8ae79a13 SR |
475 | static ssize_t |
476 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
477 | loff_t *ppos) | |
478 | { | |
c142b15d | 479 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
8ae79a13 SR |
480 | const char *system = filp->private_data; |
481 | struct ftrace_event_call *call; | |
482 | char buf[2]; | |
c142b15d | 483 | int set = 0; |
8ae79a13 SR |
484 | int ret; |
485 | ||
8ae79a13 SR |
486 | mutex_lock(&event_mutex); |
487 | list_for_each_entry(call, &ftrace_events, list) { | |
488 | if (!call->name || !call->regfunc) | |
489 | continue; | |
490 | ||
8f31bfe5 | 491 | if (system && strcmp(call->system, system) != 0) |
8ae79a13 SR |
492 | continue; |
493 | ||
494 | /* | |
495 | * We need to find out if all the events are set | |
496 | * or if all events or cleared, or if we have | |
497 | * a mixture. | |
498 | */ | |
c142b15d LZ |
499 | set |= (1 << !!call->enabled); |
500 | ||
8ae79a13 SR |
501 | /* |
502 | * If we have a mixture, no need to look further. | |
503 | */ | |
c142b15d | 504 | if (set == 3) |
8ae79a13 SR |
505 | break; |
506 | } | |
507 | mutex_unlock(&event_mutex); | |
508 | ||
c142b15d | 509 | buf[0] = set_to_char[set]; |
8ae79a13 | 510 | buf[1] = '\n'; |
8ae79a13 SR |
511 | |
512 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
513 | ||
514 | return ret; | |
515 | } | |
516 | ||
517 | static ssize_t | |
518 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
519 | loff_t *ppos) | |
520 | { | |
521 | const char *system = filp->private_data; | |
522 | unsigned long val; | |
8ae79a13 SR |
523 | char buf[64]; |
524 | ssize_t ret; | |
525 | ||
526 | if (cnt >= sizeof(buf)) | |
527 | return -EINVAL; | |
528 | ||
529 | if (copy_from_user(&buf, ubuf, cnt)) | |
530 | return -EFAULT; | |
531 | ||
532 | buf[cnt] = 0; | |
533 | ||
534 | ret = strict_strtoul(buf, 10, &val); | |
535 | if (ret < 0) | |
536 | return ret; | |
537 | ||
538 | ret = tracing_update_buffers(); | |
539 | if (ret < 0) | |
540 | return ret; | |
541 | ||
8f31bfe5 | 542 | if (val != 0 && val != 1) |
8ae79a13 | 543 | return -EINVAL; |
8ae79a13 | 544 | |
8f31bfe5 | 545 | ret = __ftrace_set_clr_event(NULL, system, NULL, val); |
8ae79a13 | 546 | if (ret) |
8f31bfe5 | 547 | goto out; |
8ae79a13 SR |
548 | |
549 | ret = cnt; | |
550 | ||
8f31bfe5 | 551 | out: |
8ae79a13 SR |
552 | *ppos += cnt; |
553 | ||
554 | return ret; | |
555 | } | |
556 | ||
75db37d2 SR |
557 | extern char *__bad_type_size(void); |
558 | ||
91729ef9 | 559 | #undef FIELD |
156b5f17 | 560 | #define FIELD(type, name) \ |
75db37d2 | 561 | sizeof(type) != sizeof(field.name) ? __bad_type_size() : \ |
cf027f64 TZ |
562 | #type, "common_" #name, offsetof(typeof(field), name), \ |
563 | sizeof(field.name) | |
91729ef9 SR |
564 | |
565 | static int trace_write_header(struct trace_seq *s) | |
566 | { | |
567 | struct trace_entry field; | |
568 | ||
569 | /* struct trace_entry */ | |
570 | return trace_seq_printf(s, | |
ce8eb2bf SR |
571 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" |
572 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
573 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
574 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
575 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
91729ef9 | 576 | "\n", |
89ec0dee | 577 | FIELD(unsigned short, type), |
91729ef9 SR |
578 | FIELD(unsigned char, flags), |
579 | FIELD(unsigned char, preempt_count), | |
580 | FIELD(int, pid), | |
581 | FIELD(int, tgid)); | |
582 | } | |
da4d0302 | 583 | |
981d081e SR |
584 | static ssize_t |
585 | event_format_read(struct file *filp, char __user *ubuf, size_t cnt, | |
586 | loff_t *ppos) | |
587 | { | |
588 | struct ftrace_event_call *call = filp->private_data; | |
589 | struct trace_seq *s; | |
590 | char *buf; | |
591 | int r; | |
592 | ||
c269fc8c TZ |
593 | if (*ppos) |
594 | return 0; | |
595 | ||
981d081e SR |
596 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
597 | if (!s) | |
598 | return -ENOMEM; | |
599 | ||
600 | trace_seq_init(s); | |
601 | ||
c5e4e192 SR |
602 | /* If any of the first writes fail, so will the show_format. */ |
603 | ||
604 | trace_seq_printf(s, "name: %s\n", call->name); | |
605 | trace_seq_printf(s, "ID: %d\n", call->id); | |
606 | trace_seq_printf(s, "format:\n"); | |
91729ef9 SR |
607 | trace_write_header(s); |
608 | ||
e8f9f4d7 | 609 | r = call->show_format(call, s); |
981d081e SR |
610 | if (!r) { |
611 | /* | |
612 | * ug! The format output is bigger than a PAGE!! | |
613 | */ | |
614 | buf = "FORMAT TOO BIG\n"; | |
615 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
616 | buf, strlen(buf)); | |
617 | goto out; | |
618 | } | |
619 | ||
620 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
621 | s->buffer, s->len); | |
622 | out: | |
623 | kfree(s); | |
624 | return r; | |
625 | } | |
626 | ||
23725aee PZ |
627 | static ssize_t |
628 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
629 | { | |
630 | struct ftrace_event_call *call = filp->private_data; | |
631 | struct trace_seq *s; | |
632 | int r; | |
633 | ||
634 | if (*ppos) | |
635 | return 0; | |
636 | ||
637 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
638 | if (!s) | |
639 | return -ENOMEM; | |
640 | ||
641 | trace_seq_init(s); | |
642 | trace_seq_printf(s, "%d\n", call->id); | |
643 | ||
644 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
645 | s->buffer, s->len); | |
646 | kfree(s); | |
647 | return r; | |
648 | } | |
649 | ||
7ce7e424 TZ |
650 | static ssize_t |
651 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
652 | loff_t *ppos) | |
653 | { | |
654 | struct ftrace_event_call *call = filp->private_data; | |
655 | struct trace_seq *s; | |
656 | int r; | |
657 | ||
658 | if (*ppos) | |
659 | return 0; | |
660 | ||
661 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
662 | if (!s) | |
663 | return -ENOMEM; | |
664 | ||
665 | trace_seq_init(s); | |
666 | ||
8b372562 | 667 | print_event_filter(call, s); |
4bda2d51 | 668 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
669 | |
670 | kfree(s); | |
671 | ||
672 | return r; | |
673 | } | |
674 | ||
675 | static ssize_t | |
676 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
677 | loff_t *ppos) | |
678 | { | |
679 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 680 | char *buf; |
7ce7e424 TZ |
681 | int err; |
682 | ||
8b372562 | 683 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
684 | return -EINVAL; |
685 | ||
8b372562 TZ |
686 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
687 | if (!buf) | |
7ce7e424 TZ |
688 | return -ENOMEM; |
689 | ||
8b372562 TZ |
690 | if (copy_from_user(buf, ubuf, cnt)) { |
691 | free_page((unsigned long) buf); | |
692 | return -EFAULT; | |
7ce7e424 | 693 | } |
8b372562 | 694 | buf[cnt] = '\0'; |
7ce7e424 | 695 | |
8b372562 TZ |
696 | err = apply_event_filter(call, buf); |
697 | free_page((unsigned long) buf); | |
698 | if (err < 0) | |
44e9c8b7 | 699 | return err; |
0a19e53c | 700 | |
7ce7e424 TZ |
701 | *ppos += cnt; |
702 | ||
703 | return cnt; | |
704 | } | |
705 | ||
cfb180f3 TZ |
706 | static ssize_t |
707 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
708 | loff_t *ppos) | |
709 | { | |
710 | struct event_subsystem *system = filp->private_data; | |
711 | struct trace_seq *s; | |
712 | int r; | |
713 | ||
714 | if (*ppos) | |
715 | return 0; | |
716 | ||
717 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
718 | if (!s) | |
719 | return -ENOMEM; | |
720 | ||
721 | trace_seq_init(s); | |
722 | ||
8b372562 | 723 | print_subsystem_event_filter(system, s); |
4bda2d51 | 724 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
725 | |
726 | kfree(s); | |
727 | ||
728 | return r; | |
729 | } | |
730 | ||
731 | static ssize_t | |
732 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
733 | loff_t *ppos) | |
734 | { | |
735 | struct event_subsystem *system = filp->private_data; | |
8b372562 | 736 | char *buf; |
cfb180f3 TZ |
737 | int err; |
738 | ||
8b372562 | 739 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
740 | return -EINVAL; |
741 | ||
8b372562 TZ |
742 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
743 | if (!buf) | |
cfb180f3 TZ |
744 | return -ENOMEM; |
745 | ||
8b372562 TZ |
746 | if (copy_from_user(buf, ubuf, cnt)) { |
747 | free_page((unsigned long) buf); | |
748 | return -EFAULT; | |
cfb180f3 | 749 | } |
8b372562 | 750 | buf[cnt] = '\0'; |
cfb180f3 | 751 | |
8b372562 TZ |
752 | err = apply_subsystem_event_filter(system, buf); |
753 | free_page((unsigned long) buf); | |
754 | if (err < 0) | |
44e9c8b7 | 755 | return err; |
cfb180f3 TZ |
756 | |
757 | *ppos += cnt; | |
758 | ||
759 | return cnt; | |
760 | } | |
761 | ||
d1b182a8 SR |
762 | static ssize_t |
763 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
764 | { | |
765 | int (*func)(struct trace_seq *s) = filp->private_data; | |
766 | struct trace_seq *s; | |
767 | int r; | |
768 | ||
769 | if (*ppos) | |
770 | return 0; | |
771 | ||
772 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
773 | if (!s) | |
774 | return -ENOMEM; | |
775 | ||
776 | trace_seq_init(s); | |
777 | ||
778 | func(s); | |
779 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
780 | ||
781 | kfree(s); | |
782 | ||
783 | return r; | |
784 | } | |
785 | ||
b77e38aa SR |
786 | static const struct seq_operations show_event_seq_ops = { |
787 | .start = t_start, | |
788 | .next = t_next, | |
789 | .show = t_show, | |
790 | .stop = t_stop, | |
791 | }; | |
792 | ||
793 | static const struct seq_operations show_set_event_seq_ops = { | |
794 | .start = s_start, | |
795 | .next = s_next, | |
796 | .show = t_show, | |
797 | .stop = t_stop, | |
798 | }; | |
799 | ||
2314c4ae SR |
800 | static const struct file_operations ftrace_avail_fops = { |
801 | .open = ftrace_event_seq_open, | |
802 | .read = seq_read, | |
803 | .llseek = seq_lseek, | |
804 | .release = seq_release, | |
805 | }; | |
806 | ||
b77e38aa SR |
807 | static const struct file_operations ftrace_set_event_fops = { |
808 | .open = ftrace_event_seq_open, | |
809 | .read = seq_read, | |
810 | .write = ftrace_event_write, | |
811 | .llseek = seq_lseek, | |
812 | .release = seq_release, | |
813 | }; | |
814 | ||
1473e441 SR |
815 | static const struct file_operations ftrace_enable_fops = { |
816 | .open = tracing_open_generic, | |
817 | .read = event_enable_read, | |
818 | .write = event_enable_write, | |
819 | }; | |
820 | ||
981d081e SR |
821 | static const struct file_operations ftrace_event_format_fops = { |
822 | .open = tracing_open_generic, | |
823 | .read = event_format_read, | |
824 | }; | |
825 | ||
23725aee PZ |
826 | static const struct file_operations ftrace_event_id_fops = { |
827 | .open = tracing_open_generic, | |
828 | .read = event_id_read, | |
829 | }; | |
830 | ||
7ce7e424 TZ |
831 | static const struct file_operations ftrace_event_filter_fops = { |
832 | .open = tracing_open_generic, | |
833 | .read = event_filter_read, | |
834 | .write = event_filter_write, | |
835 | }; | |
836 | ||
cfb180f3 TZ |
837 | static const struct file_operations ftrace_subsystem_filter_fops = { |
838 | .open = tracing_open_generic, | |
839 | .read = subsystem_filter_read, | |
840 | .write = subsystem_filter_write, | |
841 | }; | |
842 | ||
8ae79a13 SR |
843 | static const struct file_operations ftrace_system_enable_fops = { |
844 | .open = tracing_open_generic, | |
845 | .read = system_enable_read, | |
846 | .write = system_enable_write, | |
847 | }; | |
848 | ||
d1b182a8 SR |
849 | static const struct file_operations ftrace_show_header_fops = { |
850 | .open = tracing_open_generic, | |
851 | .read = show_header, | |
852 | }; | |
853 | ||
1473e441 SR |
854 | static struct dentry *event_trace_events_dir(void) |
855 | { | |
856 | static struct dentry *d_tracer; | |
857 | static struct dentry *d_events; | |
858 | ||
859 | if (d_events) | |
860 | return d_events; | |
861 | ||
862 | d_tracer = tracing_init_dentry(); | |
863 | if (!d_tracer) | |
864 | return NULL; | |
865 | ||
866 | d_events = debugfs_create_dir("events", d_tracer); | |
867 | if (!d_events) | |
868 | pr_warning("Could not create debugfs " | |
869 | "'events' directory\n"); | |
870 | ||
871 | return d_events; | |
872 | } | |
873 | ||
6ecc2d1c SR |
874 | static LIST_HEAD(event_subsystems); |
875 | ||
876 | static struct dentry * | |
877 | event_subsystem_dir(const char *name, struct dentry *d_events) | |
878 | { | |
879 | struct event_subsystem *system; | |
e1112b4d | 880 | struct dentry *entry; |
6ecc2d1c SR |
881 | |
882 | /* First see if we did not already create this dir */ | |
883 | list_for_each_entry(system, &event_subsystems, list) { | |
dc82ec98 XG |
884 | if (strcmp(system->name, name) == 0) { |
885 | system->nr_events++; | |
6ecc2d1c | 886 | return system->entry; |
dc82ec98 | 887 | } |
6ecc2d1c SR |
888 | } |
889 | ||
890 | /* need to create new entry */ | |
891 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
892 | if (!system) { | |
893 | pr_warning("No memory to create event subsystem %s\n", | |
894 | name); | |
895 | return d_events; | |
896 | } | |
897 | ||
898 | system->entry = debugfs_create_dir(name, d_events); | |
899 | if (!system->entry) { | |
900 | pr_warning("Could not create event subsystem %s\n", | |
901 | name); | |
902 | kfree(system); | |
903 | return d_events; | |
904 | } | |
905 | ||
dc82ec98 | 906 | system->nr_events = 1; |
6d723736 SR |
907 | system->name = kstrdup(name, GFP_KERNEL); |
908 | if (!system->name) { | |
909 | debugfs_remove(system->entry); | |
910 | kfree(system); | |
911 | return d_events; | |
912 | } | |
913 | ||
6ecc2d1c SR |
914 | list_add(&system->list, &event_subsystems); |
915 | ||
30e673b2 | 916 | system->filter = NULL; |
cfb180f3 | 917 | |
8b372562 TZ |
918 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
919 | if (!system->filter) { | |
920 | pr_warning("Could not allocate filter for subsystem " | |
921 | "'%s'\n", name); | |
922 | return system->entry; | |
923 | } | |
924 | ||
e1112b4d TZ |
925 | entry = debugfs_create_file("filter", 0644, system->entry, system, |
926 | &ftrace_subsystem_filter_fops); | |
8b372562 TZ |
927 | if (!entry) { |
928 | kfree(system->filter); | |
929 | system->filter = NULL; | |
e1112b4d TZ |
930 | pr_warning("Could not create debugfs " |
931 | "'%s/filter' entry\n", name); | |
8b372562 | 932 | } |
e1112b4d | 933 | |
8ae79a13 SR |
934 | entry = trace_create_file("enable", 0644, system->entry, |
935 | (void *)system->name, | |
936 | &ftrace_system_enable_fops); | |
937 | ||
6ecc2d1c SR |
938 | return system->entry; |
939 | } | |
940 | ||
1473e441 | 941 | static int |
701970b3 SR |
942 | event_create_dir(struct ftrace_event_call *call, struct dentry *d_events, |
943 | const struct file_operations *id, | |
944 | const struct file_operations *enable, | |
945 | const struct file_operations *filter, | |
946 | const struct file_operations *format) | |
1473e441 SR |
947 | { |
948 | struct dentry *entry; | |
fd994989 | 949 | int ret; |
1473e441 | 950 | |
6ecc2d1c SR |
951 | /* |
952 | * If the trace point header did not define TRACE_SYSTEM | |
953 | * then the system would be called "TRACE_SYSTEM". | |
954 | */ | |
6d723736 | 955 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
6ecc2d1c SR |
956 | d_events = event_subsystem_dir(call->system, d_events); |
957 | ||
1473e441 SR |
958 | call->dir = debugfs_create_dir(call->name, d_events); |
959 | if (!call->dir) { | |
960 | pr_warning("Could not create debugfs " | |
961 | "'%s' directory\n", call->name); | |
962 | return -1; | |
963 | } | |
964 | ||
6d723736 SR |
965 | if (call->regfunc) |
966 | entry = trace_create_file("enable", 0644, call->dir, call, | |
701970b3 | 967 | enable); |
1473e441 | 968 | |
af6af30c | 969 | if (call->id && call->profile_enable) |
6d723736 | 970 | entry = trace_create_file("id", 0444, call->dir, call, |
701970b3 | 971 | id); |
23725aee | 972 | |
cf027f64 | 973 | if (call->define_fields) { |
14be96c9 | 974 | ret = call->define_fields(call); |
cf027f64 TZ |
975 | if (ret < 0) { |
976 | pr_warning("Could not initialize trace point" | |
977 | " events/%s\n", call->name); | |
978 | return ret; | |
979 | } | |
6d723736 | 980 | entry = trace_create_file("filter", 0644, call->dir, call, |
701970b3 | 981 | filter); |
cf027f64 TZ |
982 | } |
983 | ||
981d081e SR |
984 | /* A trace may not want to export its format */ |
985 | if (!call->show_format) | |
986 | return 0; | |
987 | ||
6d723736 | 988 | entry = trace_create_file("format", 0444, call->dir, call, |
701970b3 | 989 | format); |
6d723736 SR |
990 | |
991 | return 0; | |
992 | } | |
993 | ||
994 | #define for_each_event(event, start, end) \ | |
995 | for (event = start; \ | |
996 | (unsigned long)event < (unsigned long)end; \ | |
997 | event++) | |
998 | ||
61f919a1 | 999 | #ifdef CONFIG_MODULES |
701970b3 SR |
1000 | |
1001 | static LIST_HEAD(ftrace_module_file_list); | |
1002 | ||
1003 | /* | |
1004 | * Modules must own their file_operations to keep up with | |
1005 | * reference counting. | |
1006 | */ | |
1007 | struct ftrace_module_file_ops { | |
1008 | struct list_head list; | |
1009 | struct module *mod; | |
1010 | struct file_operations id; | |
1011 | struct file_operations enable; | |
1012 | struct file_operations format; | |
1013 | struct file_operations filter; | |
1014 | }; | |
1015 | ||
a2ca5e03 FW |
1016 | static void remove_subsystem_dir(const char *name) |
1017 | { | |
1018 | struct event_subsystem *system; | |
1019 | ||
1020 | if (strcmp(name, TRACE_SYSTEM) == 0) | |
1021 | return; | |
1022 | ||
1023 | list_for_each_entry(system, &event_subsystems, list) { | |
1024 | if (strcmp(system->name, name) == 0) { | |
1025 | if (!--system->nr_events) { | |
1026 | struct event_filter *filter = system->filter; | |
1027 | ||
1028 | debugfs_remove_recursive(system->entry); | |
1029 | list_del(&system->list); | |
1030 | if (filter) { | |
1031 | kfree(filter->filter_string); | |
1032 | kfree(filter); | |
1033 | } | |
1034 | kfree(system->name); | |
1035 | kfree(system); | |
1036 | } | |
1037 | break; | |
1038 | } | |
1039 | } | |
1040 | } | |
1041 | ||
701970b3 SR |
1042 | static struct ftrace_module_file_ops * |
1043 | trace_create_file_ops(struct module *mod) | |
1044 | { | |
1045 | struct ftrace_module_file_ops *file_ops; | |
1046 | ||
1047 | /* | |
1048 | * This is a bit of a PITA. To allow for correct reference | |
1049 | * counting, modules must "own" their file_operations. | |
1050 | * To do this, we allocate the file operations that will be | |
1051 | * used in the event directory. | |
1052 | */ | |
1053 | ||
1054 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1055 | if (!file_ops) | |
1056 | return NULL; | |
1057 | ||
1058 | file_ops->mod = mod; | |
1059 | ||
1060 | file_ops->id = ftrace_event_id_fops; | |
1061 | file_ops->id.owner = mod; | |
1062 | ||
1063 | file_ops->enable = ftrace_enable_fops; | |
1064 | file_ops->enable.owner = mod; | |
1065 | ||
1066 | file_ops->filter = ftrace_event_filter_fops; | |
1067 | file_ops->filter.owner = mod; | |
1068 | ||
1069 | file_ops->format = ftrace_event_format_fops; | |
1070 | file_ops->format.owner = mod; | |
1071 | ||
1072 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1073 | ||
1074 | return file_ops; | |
1075 | } | |
1076 | ||
6d723736 SR |
1077 | static void trace_module_add_events(struct module *mod) |
1078 | { | |
701970b3 | 1079 | struct ftrace_module_file_ops *file_ops = NULL; |
6d723736 SR |
1080 | struct ftrace_event_call *call, *start, *end; |
1081 | struct dentry *d_events; | |
f744bd57 | 1082 | int ret; |
6d723736 SR |
1083 | |
1084 | start = mod->trace_events; | |
1085 | end = mod->trace_events + mod->num_trace_events; | |
1086 | ||
1087 | if (start == end) | |
1088 | return; | |
1089 | ||
1090 | d_events = event_trace_events_dir(); | |
1091 | if (!d_events) | |
1092 | return; | |
1093 | ||
1094 | for_each_event(call, start, end) { | |
1095 | /* The linker may leave blanks */ | |
1096 | if (!call->name) | |
1097 | continue; | |
f744bd57 JB |
1098 | if (call->raw_init) { |
1099 | ret = call->raw_init(); | |
1100 | if (ret < 0) { | |
1101 | if (ret != -ENOSYS) | |
1102 | pr_warning("Could not initialize trace " | |
1103 | "point events/%s\n", call->name); | |
1104 | continue; | |
1105 | } | |
1106 | } | |
701970b3 SR |
1107 | /* |
1108 | * This module has events, create file ops for this module | |
1109 | * if not already done. | |
1110 | */ | |
1111 | if (!file_ops) { | |
1112 | file_ops = trace_create_file_ops(mod); | |
1113 | if (!file_ops) | |
1114 | return; | |
1115 | } | |
6d723736 SR |
1116 | call->mod = mod; |
1117 | list_add(&call->list, &ftrace_events); | |
701970b3 SR |
1118 | event_create_dir(call, d_events, |
1119 | &file_ops->id, &file_ops->enable, | |
1120 | &file_ops->filter, &file_ops->format); | |
6d723736 SR |
1121 | } |
1122 | } | |
1123 | ||
1124 | static void trace_module_remove_events(struct module *mod) | |
1125 | { | |
701970b3 | 1126 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1127 | struct ftrace_event_call *call, *p; |
9456f0fa | 1128 | bool found = false; |
6d723736 | 1129 | |
110bf2b7 | 1130 | down_write(&trace_event_mutex); |
6d723736 SR |
1131 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1132 | if (call->mod == mod) { | |
9456f0fa | 1133 | found = true; |
0e907c99 | 1134 | ftrace_event_enable_disable(call, 0); |
6d723736 | 1135 | if (call->event) |
110bf2b7 | 1136 | __unregister_ftrace_event(call->event); |
6d723736 SR |
1137 | debugfs_remove_recursive(call->dir); |
1138 | list_del(&call->list); | |
2df75e41 LZ |
1139 | trace_destroy_fields(call); |
1140 | destroy_preds(call); | |
dc82ec98 | 1141 | remove_subsystem_dir(call->system); |
6d723736 SR |
1142 | } |
1143 | } | |
701970b3 SR |
1144 | |
1145 | /* Now free the file_operations */ | |
1146 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1147 | if (file_ops->mod == mod) | |
1148 | break; | |
1149 | } | |
1150 | if (&file_ops->list != &ftrace_module_file_list) { | |
1151 | list_del(&file_ops->list); | |
1152 | kfree(file_ops); | |
1153 | } | |
9456f0fa SR |
1154 | |
1155 | /* | |
1156 | * It is safest to reset the ring buffer if the module being unloaded | |
1157 | * registered any events. | |
1158 | */ | |
1159 | if (found) | |
1160 | tracing_reset_current_online_cpus(); | |
110bf2b7 | 1161 | up_write(&trace_event_mutex); |
6d723736 SR |
1162 | } |
1163 | ||
61f919a1 SR |
1164 | static int trace_module_notify(struct notifier_block *self, |
1165 | unsigned long val, void *data) | |
6d723736 SR |
1166 | { |
1167 | struct module *mod = data; | |
1168 | ||
1169 | mutex_lock(&event_mutex); | |
1170 | switch (val) { | |
1171 | case MODULE_STATE_COMING: | |
1172 | trace_module_add_events(mod); | |
1173 | break; | |
1174 | case MODULE_STATE_GOING: | |
1175 | trace_module_remove_events(mod); | |
1176 | break; | |
1177 | } | |
1178 | mutex_unlock(&event_mutex); | |
fd994989 | 1179 | |
1473e441 SR |
1180 | return 0; |
1181 | } | |
61f919a1 SR |
1182 | #else |
1183 | static int trace_module_notify(struct notifier_block *self, | |
1184 | unsigned long val, void *data) | |
1185 | { | |
1186 | return 0; | |
1187 | } | |
1188 | #endif /* CONFIG_MODULES */ | |
1473e441 | 1189 | |
6d723736 SR |
1190 | struct notifier_block trace_module_nb = { |
1191 | .notifier_call = trace_module_notify, | |
1192 | .priority = 0, | |
1193 | }; | |
1194 | ||
a59fd602 SR |
1195 | extern struct ftrace_event_call __start_ftrace_events[]; |
1196 | extern struct ftrace_event_call __stop_ftrace_events[]; | |
1197 | ||
020e5f85 LZ |
1198 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
1199 | ||
1200 | static __init int setup_trace_event(char *str) | |
1201 | { | |
1202 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
1203 | ring_buffer_expanded = 1; | |
1204 | tracing_selftest_disabled = 1; | |
1205 | ||
1206 | return 1; | |
1207 | } | |
1208 | __setup("trace_event=", setup_trace_event); | |
1209 | ||
b77e38aa SR |
1210 | static __init int event_trace_init(void) |
1211 | { | |
a59fd602 | 1212 | struct ftrace_event_call *call; |
b77e38aa SR |
1213 | struct dentry *d_tracer; |
1214 | struct dentry *entry; | |
1473e441 | 1215 | struct dentry *d_events; |
6d723736 | 1216 | int ret; |
020e5f85 LZ |
1217 | char *buf = bootup_event_buf; |
1218 | char *token; | |
b77e38aa SR |
1219 | |
1220 | d_tracer = tracing_init_dentry(); | |
1221 | if (!d_tracer) | |
1222 | return 0; | |
1223 | ||
2314c4ae SR |
1224 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
1225 | (void *)&show_event_seq_ops, | |
1226 | &ftrace_avail_fops); | |
1227 | if (!entry) | |
1228 | pr_warning("Could not create debugfs " | |
1229 | "'available_events' entry\n"); | |
1230 | ||
b77e38aa SR |
1231 | entry = debugfs_create_file("set_event", 0644, d_tracer, |
1232 | (void *)&show_set_event_seq_ops, | |
1233 | &ftrace_set_event_fops); | |
1234 | if (!entry) | |
1235 | pr_warning("Could not create debugfs " | |
1236 | "'set_event' entry\n"); | |
1237 | ||
1473e441 SR |
1238 | d_events = event_trace_events_dir(); |
1239 | if (!d_events) | |
1240 | return 0; | |
1241 | ||
d1b182a8 SR |
1242 | /* ring buffer internal formats */ |
1243 | trace_create_file("header_page", 0444, d_events, | |
1244 | ring_buffer_print_page_header, | |
1245 | &ftrace_show_header_fops); | |
1246 | ||
1247 | trace_create_file("header_event", 0444, d_events, | |
1248 | ring_buffer_print_entry_header, | |
1249 | &ftrace_show_header_fops); | |
1250 | ||
8ae79a13 | 1251 | trace_create_file("enable", 0644, d_events, |
8f31bfe5 | 1252 | NULL, &ftrace_system_enable_fops); |
8ae79a13 | 1253 | |
6d723736 | 1254 | for_each_event(call, __start_ftrace_events, __stop_ftrace_events) { |
1473e441 SR |
1255 | /* The linker may leave blanks */ |
1256 | if (!call->name) | |
1257 | continue; | |
f744bd57 JB |
1258 | if (call->raw_init) { |
1259 | ret = call->raw_init(); | |
1260 | if (ret < 0) { | |
1261 | if (ret != -ENOSYS) | |
1262 | pr_warning("Could not initialize trace " | |
1263 | "point events/%s\n", call->name); | |
1264 | continue; | |
1265 | } | |
1266 | } | |
a59fd602 | 1267 | list_add(&call->list, &ftrace_events); |
701970b3 SR |
1268 | event_create_dir(call, d_events, &ftrace_event_id_fops, |
1269 | &ftrace_enable_fops, &ftrace_event_filter_fops, | |
1270 | &ftrace_event_format_fops); | |
1473e441 SR |
1271 | } |
1272 | ||
020e5f85 LZ |
1273 | while (true) { |
1274 | token = strsep(&buf, ","); | |
1275 | ||
1276 | if (!token) | |
1277 | break; | |
1278 | if (!*token) | |
1279 | continue; | |
1280 | ||
1281 | ret = ftrace_set_clr_event(token, 1); | |
1282 | if (ret) | |
1283 | pr_warning("Failed to enable trace event: %s\n", token); | |
1284 | } | |
1285 | ||
6d723736 | 1286 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 1287 | if (ret) |
6d723736 SR |
1288 | pr_warning("Failed to register trace events module notifier\n"); |
1289 | ||
b77e38aa SR |
1290 | return 0; |
1291 | } | |
1292 | fs_initcall(event_trace_init); | |
e6187007 SR |
1293 | |
1294 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1295 | ||
1296 | static DEFINE_SPINLOCK(test_spinlock); | |
1297 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
1298 | static DEFINE_MUTEX(test_mutex); | |
1299 | ||
1300 | static __init void test_work(struct work_struct *dummy) | |
1301 | { | |
1302 | spin_lock(&test_spinlock); | |
1303 | spin_lock_irq(&test_spinlock_irq); | |
1304 | udelay(1); | |
1305 | spin_unlock_irq(&test_spinlock_irq); | |
1306 | spin_unlock(&test_spinlock); | |
1307 | ||
1308 | mutex_lock(&test_mutex); | |
1309 | msleep(1); | |
1310 | mutex_unlock(&test_mutex); | |
1311 | } | |
1312 | ||
1313 | static __init int event_test_thread(void *unused) | |
1314 | { | |
1315 | void *test_malloc; | |
1316 | ||
1317 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
1318 | if (!test_malloc) | |
1319 | pr_info("failed to kmalloc\n"); | |
1320 | ||
1321 | schedule_on_each_cpu(test_work); | |
1322 | ||
1323 | kfree(test_malloc); | |
1324 | ||
1325 | set_current_state(TASK_INTERRUPTIBLE); | |
1326 | while (!kthread_should_stop()) | |
1327 | schedule(); | |
1328 | ||
1329 | return 0; | |
1330 | } | |
1331 | ||
1332 | /* | |
1333 | * Do various things that may trigger events. | |
1334 | */ | |
1335 | static __init void event_test_stuff(void) | |
1336 | { | |
1337 | struct task_struct *test_thread; | |
1338 | ||
1339 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
1340 | msleep(1); | |
1341 | kthread_stop(test_thread); | |
1342 | } | |
1343 | ||
1344 | /* | |
1345 | * For every trace event defined, we will test each trace point separately, | |
1346 | * and then by groups, and finally all trace points. | |
1347 | */ | |
9ea21c1e | 1348 | static __init void event_trace_self_tests(void) |
e6187007 SR |
1349 | { |
1350 | struct ftrace_event_call *call; | |
1351 | struct event_subsystem *system; | |
e6187007 SR |
1352 | int ret; |
1353 | ||
1354 | pr_info("Running tests on trace events:\n"); | |
1355 | ||
1356 | list_for_each_entry(call, &ftrace_events, list) { | |
1357 | ||
1358 | /* Only test those that have a regfunc */ | |
1359 | if (!call->regfunc) | |
1360 | continue; | |
1361 | ||
1362 | pr_info("Testing event %s: ", call->name); | |
1363 | ||
1364 | /* | |
1365 | * If an event is already enabled, someone is using | |
1366 | * it and the self test should not be on. | |
1367 | */ | |
1368 | if (call->enabled) { | |
1369 | pr_warning("Enabled event during self test!\n"); | |
1370 | WARN_ON_ONCE(1); | |
1371 | continue; | |
1372 | } | |
1373 | ||
0e907c99 | 1374 | ftrace_event_enable_disable(call, 1); |
e6187007 | 1375 | event_test_stuff(); |
0e907c99 | 1376 | ftrace_event_enable_disable(call, 0); |
e6187007 SR |
1377 | |
1378 | pr_cont("OK\n"); | |
1379 | } | |
1380 | ||
1381 | /* Now test at the sub system level */ | |
1382 | ||
1383 | pr_info("Running tests on trace event systems:\n"); | |
1384 | ||
1385 | list_for_each_entry(system, &event_subsystems, list) { | |
1386 | ||
1387 | /* the ftrace system is special, skip it */ | |
1388 | if (strcmp(system->name, "ftrace") == 0) | |
1389 | continue; | |
1390 | ||
1391 | pr_info("Testing event system %s: ", system->name); | |
1392 | ||
8f31bfe5 | 1393 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1); |
e6187007 SR |
1394 | if (WARN_ON_ONCE(ret)) { |
1395 | pr_warning("error enabling system %s\n", | |
1396 | system->name); | |
1397 | continue; | |
1398 | } | |
1399 | ||
1400 | event_test_stuff(); | |
1401 | ||
8f31bfe5 | 1402 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0); |
e6187007 SR |
1403 | if (WARN_ON_ONCE(ret)) |
1404 | pr_warning("error disabling system %s\n", | |
1405 | system->name); | |
1406 | ||
1407 | pr_cont("OK\n"); | |
1408 | } | |
1409 | ||
1410 | /* Test with all events enabled */ | |
1411 | ||
1412 | pr_info("Running tests on all trace events:\n"); | |
1413 | pr_info("Testing all events: "); | |
1414 | ||
8f31bfe5 | 1415 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1); |
e6187007 | 1416 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 1417 | pr_warning("error enabling all events\n"); |
9ea21c1e | 1418 | return; |
e6187007 SR |
1419 | } |
1420 | ||
1421 | event_test_stuff(); | |
1422 | ||
1423 | /* reset sysname */ | |
8f31bfe5 | 1424 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0); |
e6187007 SR |
1425 | if (WARN_ON_ONCE(ret)) { |
1426 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 1427 | return; |
e6187007 SR |
1428 | } |
1429 | ||
1430 | pr_cont("OK\n"); | |
9ea21c1e SR |
1431 | } |
1432 | ||
1433 | #ifdef CONFIG_FUNCTION_TRACER | |
1434 | ||
1435 | static DEFINE_PER_CPU(atomic_t, test_event_disable); | |
1436 | ||
1437 | static void | |
1438 | function_test_events_call(unsigned long ip, unsigned long parent_ip) | |
1439 | { | |
1440 | struct ring_buffer_event *event; | |
e77405ad | 1441 | struct ring_buffer *buffer; |
9ea21c1e SR |
1442 | struct ftrace_entry *entry; |
1443 | unsigned long flags; | |
1444 | long disabled; | |
1445 | int resched; | |
1446 | int cpu; | |
1447 | int pc; | |
1448 | ||
1449 | pc = preempt_count(); | |
1450 | resched = ftrace_preempt_disable(); | |
1451 | cpu = raw_smp_processor_id(); | |
1452 | disabled = atomic_inc_return(&per_cpu(test_event_disable, cpu)); | |
1453 | ||
1454 | if (disabled != 1) | |
1455 | goto out; | |
1456 | ||
1457 | local_save_flags(flags); | |
1458 | ||
e77405ad SR |
1459 | event = trace_current_buffer_lock_reserve(&buffer, |
1460 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
1461 | flags, pc); |
1462 | if (!event) | |
1463 | goto out; | |
1464 | entry = ring_buffer_event_data(event); | |
1465 | entry->ip = ip; | |
1466 | entry->parent_ip = parent_ip; | |
1467 | ||
e77405ad | 1468 | trace_nowake_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
1469 | |
1470 | out: | |
1471 | atomic_dec(&per_cpu(test_event_disable, cpu)); | |
1472 | ftrace_preempt_enable(resched); | |
1473 | } | |
1474 | ||
1475 | static struct ftrace_ops trace_ops __initdata = | |
1476 | { | |
1477 | .func = function_test_events_call, | |
1478 | }; | |
1479 | ||
1480 | static __init void event_trace_self_test_with_function(void) | |
1481 | { | |
1482 | register_ftrace_function(&trace_ops); | |
1483 | pr_info("Running tests again, along with the function tracer\n"); | |
1484 | event_trace_self_tests(); | |
1485 | unregister_ftrace_function(&trace_ops); | |
1486 | } | |
1487 | #else | |
1488 | static __init void event_trace_self_test_with_function(void) | |
1489 | { | |
1490 | } | |
1491 | #endif | |
1492 | ||
1493 | static __init int event_trace_self_tests_init(void) | |
1494 | { | |
020e5f85 LZ |
1495 | if (!tracing_selftest_disabled) { |
1496 | event_trace_self_tests(); | |
1497 | event_trace_self_test_with_function(); | |
1498 | } | |
e6187007 SR |
1499 | |
1500 | return 0; | |
1501 | } | |
1502 | ||
28d20e2d | 1503 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
1504 | |
1505 | #endif |