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); | |
e647d6b3 LZ |
89 | |
90 | return ret; | |
91 | } | |
540b7b8d | 92 | EXPORT_SYMBOL_GPL(trace_define_common_fields); |
e647d6b3 | 93 | |
2df75e41 LZ |
94 | #ifdef CONFIG_MODULES |
95 | ||
96 | static void trace_destroy_fields(struct ftrace_event_call *call) | |
97 | { | |
98 | struct ftrace_event_field *field, *next; | |
99 | ||
100 | list_for_each_entry_safe(field, next, &call->fields, link) { | |
101 | list_del(&field->link); | |
102 | kfree(field->type); | |
103 | kfree(field->name); | |
104 | kfree(field); | |
105 | } | |
106 | } | |
107 | ||
108 | #endif /* CONFIG_MODULES */ | |
109 | ||
fd994989 SR |
110 | static void ftrace_event_enable_disable(struct ftrace_event_call *call, |
111 | int enable) | |
112 | { | |
fd994989 SR |
113 | switch (enable) { |
114 | case 0: | |
115 | if (call->enabled) { | |
116 | call->enabled = 0; | |
b11c53e1 | 117 | tracing_stop_cmdline_record(); |
69fd4f0e | 118 | call->unregfunc(call->data); |
fd994989 | 119 | } |
fd994989 SR |
120 | break; |
121 | case 1: | |
da4d0302 | 122 | if (!call->enabled) { |
fd994989 | 123 | call->enabled = 1; |
b11c53e1 | 124 | tracing_start_cmdline_record(); |
69fd4f0e | 125 | call->regfunc(call->data); |
fd994989 | 126 | } |
fd994989 SR |
127 | break; |
128 | } | |
129 | } | |
130 | ||
0e907c99 Z |
131 | static void ftrace_clear_events(void) |
132 | { | |
133 | struct ftrace_event_call *call; | |
134 | ||
135 | mutex_lock(&event_mutex); | |
136 | list_for_each_entry(call, &ftrace_events, list) { | |
137 | ftrace_event_enable_disable(call, 0); | |
138 | } | |
139 | mutex_unlock(&event_mutex); | |
140 | } | |
141 | ||
8f31bfe5 LZ |
142 | /* |
143 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
144 | */ | |
145 | static int __ftrace_set_clr_event(const char *match, const char *sub, | |
146 | const char *event, int set) | |
b77e38aa | 147 | { |
a59fd602 | 148 | struct ftrace_event_call *call; |
29f93943 | 149 | int ret = -EINVAL; |
8f31bfe5 LZ |
150 | |
151 | mutex_lock(&event_mutex); | |
152 | list_for_each_entry(call, &ftrace_events, list) { | |
153 | ||
154 | if (!call->name || !call->regfunc) | |
155 | continue; | |
156 | ||
157 | if (match && | |
158 | strcmp(match, call->name) != 0 && | |
159 | strcmp(match, call->system) != 0) | |
160 | continue; | |
161 | ||
162 | if (sub && strcmp(sub, call->system) != 0) | |
163 | continue; | |
164 | ||
165 | if (event && strcmp(event, call->name) != 0) | |
166 | continue; | |
167 | ||
168 | ftrace_event_enable_disable(call, set); | |
169 | ||
170 | ret = 0; | |
171 | } | |
172 | mutex_unlock(&event_mutex); | |
173 | ||
174 | return ret; | |
175 | } | |
176 | ||
177 | static int ftrace_set_clr_event(char *buf, int set) | |
178 | { | |
b628b3e6 | 179 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
180 | |
181 | /* | |
182 | * The buf format can be <subsystem>:<event-name> | |
183 | * *:<event-name> means any event by that name. | |
184 | * :<event-name> is the same. | |
185 | * | |
186 | * <subsystem>:* means all events in that subsystem | |
187 | * <subsystem>: means the same. | |
188 | * | |
189 | * <name> (no ':') means all events in a subsystem with | |
190 | * the name <name> or any event that matches <name> | |
191 | */ | |
192 | ||
193 | match = strsep(&buf, ":"); | |
194 | if (buf) { | |
195 | sub = match; | |
196 | event = buf; | |
197 | match = NULL; | |
198 | ||
199 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
200 | sub = NULL; | |
201 | if (!strlen(event) || strcmp(event, "*") == 0) | |
202 | event = NULL; | |
203 | } | |
b77e38aa | 204 | |
8f31bfe5 | 205 | return __ftrace_set_clr_event(match, sub, event, set); |
b77e38aa SR |
206 | } |
207 | ||
4671c794 SR |
208 | /** |
209 | * trace_set_clr_event - enable or disable an event | |
210 | * @system: system name to match (NULL for any system) | |
211 | * @event: event name to match (NULL for all events, within system) | |
212 | * @set: 1 to enable, 0 to disable | |
213 | * | |
214 | * This is a way for other parts of the kernel to enable or disable | |
215 | * event recording. | |
216 | * | |
217 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
218 | * registered events. | |
219 | */ | |
220 | int trace_set_clr_event(const char *system, const char *event, int set) | |
221 | { | |
222 | return __ftrace_set_clr_event(NULL, system, event, set); | |
223 | } | |
224 | ||
b77e38aa SR |
225 | /* 128 should be much more than enough */ |
226 | #define EVENT_BUF_SIZE 127 | |
227 | ||
228 | static ssize_t | |
229 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
230 | size_t cnt, loff_t *ppos) | |
231 | { | |
232 | size_t read = 0; | |
233 | int i, set = 1; | |
234 | ssize_t ret; | |
235 | char *buf; | |
236 | char ch; | |
237 | ||
238 | if (!cnt || cnt < 0) | |
239 | return 0; | |
240 | ||
1852fcce SR |
241 | ret = tracing_update_buffers(); |
242 | if (ret < 0) | |
243 | return ret; | |
244 | ||
b77e38aa SR |
245 | ret = get_user(ch, ubuf++); |
246 | if (ret) | |
247 | return ret; | |
248 | read++; | |
249 | cnt--; | |
250 | ||
251 | /* skip white space */ | |
252 | while (cnt && isspace(ch)) { | |
253 | ret = get_user(ch, ubuf++); | |
254 | if (ret) | |
255 | return ret; | |
256 | read++; | |
257 | cnt--; | |
258 | } | |
259 | ||
260 | /* Only white space found? */ | |
261 | if (isspace(ch)) { | |
262 | file->f_pos += read; | |
263 | ret = read; | |
264 | return ret; | |
265 | } | |
266 | ||
267 | buf = kmalloc(EVENT_BUF_SIZE+1, GFP_KERNEL); | |
268 | if (!buf) | |
269 | return -ENOMEM; | |
270 | ||
271 | if (cnt > EVENT_BUF_SIZE) | |
272 | cnt = EVENT_BUF_SIZE; | |
273 | ||
274 | i = 0; | |
275 | while (cnt && !isspace(ch)) { | |
276 | if (!i && ch == '!') | |
277 | set = 0; | |
278 | else | |
279 | buf[i++] = ch; | |
280 | ||
281 | ret = get_user(ch, ubuf++); | |
282 | if (ret) | |
283 | goto out_free; | |
284 | read++; | |
285 | cnt--; | |
286 | } | |
287 | buf[i] = 0; | |
288 | ||
289 | file->f_pos += read; | |
290 | ||
291 | ret = ftrace_set_clr_event(buf, set); | |
292 | if (ret) | |
293 | goto out_free; | |
294 | ||
295 | ret = read; | |
296 | ||
297 | out_free: | |
298 | kfree(buf); | |
299 | ||
300 | return ret; | |
301 | } | |
302 | ||
303 | static void * | |
304 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
305 | { | |
a59fd602 SR |
306 | struct list_head *list = m->private; |
307 | struct ftrace_event_call *call; | |
b77e38aa SR |
308 | |
309 | (*pos)++; | |
310 | ||
40e26815 | 311 | for (;;) { |
a59fd602 | 312 | if (list == &ftrace_events) |
40e26815 SR |
313 | return NULL; |
314 | ||
a59fd602 SR |
315 | call = list_entry(list, struct ftrace_event_call, list); |
316 | ||
40e26815 SR |
317 | /* |
318 | * The ftrace subsystem is for showing formats only. | |
319 | * They can not be enabled or disabled via the event files. | |
320 | */ | |
321 | if (call->regfunc) | |
322 | break; | |
323 | ||
a59fd602 | 324 | list = list->next; |
40e26815 | 325 | } |
b77e38aa | 326 | |
a59fd602 | 327 | m->private = list->next; |
b77e38aa SR |
328 | |
329 | return call; | |
330 | } | |
331 | ||
332 | static void *t_start(struct seq_file *m, loff_t *pos) | |
333 | { | |
e1c7e2a6 LZ |
334 | struct ftrace_event_call *call = NULL; |
335 | loff_t l; | |
336 | ||
20c8928a | 337 | mutex_lock(&event_mutex); |
e1c7e2a6 LZ |
338 | |
339 | m->private = ftrace_events.next; | |
340 | for (l = 0; l <= *pos; ) { | |
341 | call = t_next(m, NULL, &l); | |
342 | if (!call) | |
343 | break; | |
344 | } | |
345 | return call; | |
b77e38aa SR |
346 | } |
347 | ||
348 | static void * | |
349 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
350 | { | |
a59fd602 SR |
351 | struct list_head *list = m->private; |
352 | struct ftrace_event_call *call; | |
b77e38aa SR |
353 | |
354 | (*pos)++; | |
355 | ||
356 | retry: | |
a59fd602 | 357 | if (list == &ftrace_events) |
b77e38aa SR |
358 | return NULL; |
359 | ||
a59fd602 SR |
360 | call = list_entry(list, struct ftrace_event_call, list); |
361 | ||
b77e38aa | 362 | if (!call->enabled) { |
a59fd602 | 363 | list = list->next; |
b77e38aa SR |
364 | goto retry; |
365 | } | |
366 | ||
a59fd602 | 367 | m->private = list->next; |
b77e38aa SR |
368 | |
369 | return call; | |
370 | } | |
371 | ||
372 | static void *s_start(struct seq_file *m, loff_t *pos) | |
373 | { | |
e1c7e2a6 LZ |
374 | struct ftrace_event_call *call = NULL; |
375 | loff_t l; | |
376 | ||
20c8928a | 377 | mutex_lock(&event_mutex); |
e1c7e2a6 LZ |
378 | |
379 | m->private = ftrace_events.next; | |
380 | for (l = 0; l <= *pos; ) { | |
381 | call = s_next(m, NULL, &l); | |
382 | if (!call) | |
383 | break; | |
384 | } | |
385 | return call; | |
b77e38aa SR |
386 | } |
387 | ||
388 | static int t_show(struct seq_file *m, void *v) | |
389 | { | |
390 | struct ftrace_event_call *call = v; | |
391 | ||
b628b3e6 SR |
392 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
393 | seq_printf(m, "%s:", call->system); | |
b77e38aa SR |
394 | seq_printf(m, "%s\n", call->name); |
395 | ||
396 | return 0; | |
397 | } | |
398 | ||
399 | static void t_stop(struct seq_file *m, void *p) | |
400 | { | |
20c8928a | 401 | mutex_unlock(&event_mutex); |
b77e38aa SR |
402 | } |
403 | ||
404 | static int | |
405 | ftrace_event_seq_open(struct inode *inode, struct file *file) | |
406 | { | |
b77e38aa SR |
407 | const struct seq_operations *seq_ops; |
408 | ||
409 | if ((file->f_mode & FMODE_WRITE) && | |
8650ae32 | 410 | (file->f_flags & O_TRUNC)) |
b77e38aa SR |
411 | ftrace_clear_events(); |
412 | ||
413 | seq_ops = inode->i_private; | |
20c8928a | 414 | return seq_open(file, seq_ops); |
b77e38aa SR |
415 | } |
416 | ||
1473e441 SR |
417 | static ssize_t |
418 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
419 | loff_t *ppos) | |
420 | { | |
421 | struct ftrace_event_call *call = filp->private_data; | |
422 | char *buf; | |
423 | ||
da4d0302 | 424 | if (call->enabled) |
1473e441 SR |
425 | buf = "1\n"; |
426 | else | |
427 | buf = "0\n"; | |
428 | ||
429 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
430 | } | |
431 | ||
432 | static ssize_t | |
433 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
434 | loff_t *ppos) | |
435 | { | |
436 | struct ftrace_event_call *call = filp->private_data; | |
437 | char buf[64]; | |
438 | unsigned long val; | |
439 | int ret; | |
440 | ||
441 | if (cnt >= sizeof(buf)) | |
442 | return -EINVAL; | |
443 | ||
444 | if (copy_from_user(&buf, ubuf, cnt)) | |
445 | return -EFAULT; | |
446 | ||
447 | buf[cnt] = 0; | |
448 | ||
449 | ret = strict_strtoul(buf, 10, &val); | |
450 | if (ret < 0) | |
451 | return ret; | |
452 | ||
1852fcce SR |
453 | ret = tracing_update_buffers(); |
454 | if (ret < 0) | |
455 | return ret; | |
456 | ||
1473e441 SR |
457 | switch (val) { |
458 | case 0: | |
1473e441 | 459 | case 1: |
11a241a3 | 460 | mutex_lock(&event_mutex); |
fd994989 | 461 | ftrace_event_enable_disable(call, val); |
11a241a3 | 462 | mutex_unlock(&event_mutex); |
1473e441 SR |
463 | break; |
464 | ||
465 | default: | |
466 | return -EINVAL; | |
467 | } | |
468 | ||
469 | *ppos += cnt; | |
470 | ||
471 | return cnt; | |
472 | } | |
473 | ||
8ae79a13 SR |
474 | static ssize_t |
475 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
476 | loff_t *ppos) | |
477 | { | |
c142b15d | 478 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
8ae79a13 SR |
479 | const char *system = filp->private_data; |
480 | struct ftrace_event_call *call; | |
481 | char buf[2]; | |
c142b15d | 482 | int set = 0; |
8ae79a13 SR |
483 | int ret; |
484 | ||
8ae79a13 SR |
485 | mutex_lock(&event_mutex); |
486 | list_for_each_entry(call, &ftrace_events, list) { | |
487 | if (!call->name || !call->regfunc) | |
488 | continue; | |
489 | ||
8f31bfe5 | 490 | if (system && strcmp(call->system, system) != 0) |
8ae79a13 SR |
491 | continue; |
492 | ||
493 | /* | |
494 | * We need to find out if all the events are set | |
495 | * or if all events or cleared, or if we have | |
496 | * a mixture. | |
497 | */ | |
c142b15d LZ |
498 | set |= (1 << !!call->enabled); |
499 | ||
8ae79a13 SR |
500 | /* |
501 | * If we have a mixture, no need to look further. | |
502 | */ | |
c142b15d | 503 | if (set == 3) |
8ae79a13 SR |
504 | break; |
505 | } | |
506 | mutex_unlock(&event_mutex); | |
507 | ||
c142b15d | 508 | buf[0] = set_to_char[set]; |
8ae79a13 | 509 | buf[1] = '\n'; |
8ae79a13 SR |
510 | |
511 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
512 | ||
513 | return ret; | |
514 | } | |
515 | ||
516 | static ssize_t | |
517 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
518 | loff_t *ppos) | |
519 | { | |
520 | const char *system = filp->private_data; | |
521 | unsigned long val; | |
8ae79a13 SR |
522 | char buf[64]; |
523 | ssize_t ret; | |
524 | ||
525 | if (cnt >= sizeof(buf)) | |
526 | return -EINVAL; | |
527 | ||
528 | if (copy_from_user(&buf, ubuf, cnt)) | |
529 | return -EFAULT; | |
530 | ||
531 | buf[cnt] = 0; | |
532 | ||
533 | ret = strict_strtoul(buf, 10, &val); | |
534 | if (ret < 0) | |
535 | return ret; | |
536 | ||
537 | ret = tracing_update_buffers(); | |
538 | if (ret < 0) | |
539 | return ret; | |
540 | ||
8f31bfe5 | 541 | if (val != 0 && val != 1) |
8ae79a13 | 542 | return -EINVAL; |
8ae79a13 | 543 | |
8f31bfe5 | 544 | ret = __ftrace_set_clr_event(NULL, system, NULL, val); |
8ae79a13 | 545 | if (ret) |
8f31bfe5 | 546 | goto out; |
8ae79a13 SR |
547 | |
548 | ret = cnt; | |
549 | ||
8f31bfe5 | 550 | out: |
8ae79a13 SR |
551 | *ppos += cnt; |
552 | ||
553 | return ret; | |
554 | } | |
555 | ||
75db37d2 SR |
556 | extern char *__bad_type_size(void); |
557 | ||
91729ef9 | 558 | #undef FIELD |
156b5f17 | 559 | #define FIELD(type, name) \ |
75db37d2 | 560 | sizeof(type) != sizeof(field.name) ? __bad_type_size() : \ |
cf027f64 TZ |
561 | #type, "common_" #name, offsetof(typeof(field), name), \ |
562 | sizeof(field.name) | |
91729ef9 SR |
563 | |
564 | static int trace_write_header(struct trace_seq *s) | |
565 | { | |
566 | struct trace_entry field; | |
567 | ||
568 | /* struct trace_entry */ | |
569 | return trace_seq_printf(s, | |
ce8eb2bf SR |
570 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" |
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" | |
91729ef9 | 574 | "\n", |
89ec0dee | 575 | FIELD(unsigned short, type), |
91729ef9 SR |
576 | FIELD(unsigned char, flags), |
577 | FIELD(unsigned char, preempt_count), | |
48659d31 | 578 | FIELD(int, pid)); |
91729ef9 | 579 | } |
da4d0302 | 580 | |
981d081e SR |
581 | static ssize_t |
582 | event_format_read(struct file *filp, char __user *ubuf, size_t cnt, | |
583 | loff_t *ppos) | |
584 | { | |
585 | struct ftrace_event_call *call = filp->private_data; | |
586 | struct trace_seq *s; | |
587 | char *buf; | |
588 | int r; | |
589 | ||
c269fc8c TZ |
590 | if (*ppos) |
591 | return 0; | |
592 | ||
981d081e SR |
593 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
594 | if (!s) | |
595 | return -ENOMEM; | |
596 | ||
597 | trace_seq_init(s); | |
598 | ||
c5e4e192 SR |
599 | /* If any of the first writes fail, so will the show_format. */ |
600 | ||
601 | trace_seq_printf(s, "name: %s\n", call->name); | |
602 | trace_seq_printf(s, "ID: %d\n", call->id); | |
603 | trace_seq_printf(s, "format:\n"); | |
91729ef9 SR |
604 | trace_write_header(s); |
605 | ||
e8f9f4d7 | 606 | r = call->show_format(call, s); |
981d081e SR |
607 | if (!r) { |
608 | /* | |
609 | * ug! The format output is bigger than a PAGE!! | |
610 | */ | |
611 | buf = "FORMAT TOO BIG\n"; | |
612 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
613 | buf, strlen(buf)); | |
614 | goto out; | |
615 | } | |
616 | ||
617 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
618 | s->buffer, s->len); | |
619 | out: | |
620 | kfree(s); | |
621 | return r; | |
622 | } | |
623 | ||
23725aee PZ |
624 | static ssize_t |
625 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
626 | { | |
627 | struct ftrace_event_call *call = filp->private_data; | |
628 | struct trace_seq *s; | |
629 | int r; | |
630 | ||
631 | if (*ppos) | |
632 | return 0; | |
633 | ||
634 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
635 | if (!s) | |
636 | return -ENOMEM; | |
637 | ||
638 | trace_seq_init(s); | |
639 | trace_seq_printf(s, "%d\n", call->id); | |
640 | ||
641 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
642 | s->buffer, s->len); | |
643 | kfree(s); | |
644 | return r; | |
645 | } | |
646 | ||
7ce7e424 TZ |
647 | static ssize_t |
648 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
649 | loff_t *ppos) | |
650 | { | |
651 | struct ftrace_event_call *call = filp->private_data; | |
652 | struct trace_seq *s; | |
653 | int r; | |
654 | ||
655 | if (*ppos) | |
656 | return 0; | |
657 | ||
658 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
659 | if (!s) | |
660 | return -ENOMEM; | |
661 | ||
662 | trace_seq_init(s); | |
663 | ||
8b372562 | 664 | print_event_filter(call, s); |
4bda2d51 | 665 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
666 | |
667 | kfree(s); | |
668 | ||
669 | return r; | |
670 | } | |
671 | ||
672 | static ssize_t | |
673 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
674 | loff_t *ppos) | |
675 | { | |
676 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 677 | char *buf; |
7ce7e424 TZ |
678 | int err; |
679 | ||
8b372562 | 680 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
681 | return -EINVAL; |
682 | ||
8b372562 TZ |
683 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
684 | if (!buf) | |
7ce7e424 TZ |
685 | return -ENOMEM; |
686 | ||
8b372562 TZ |
687 | if (copy_from_user(buf, ubuf, cnt)) { |
688 | free_page((unsigned long) buf); | |
689 | return -EFAULT; | |
7ce7e424 | 690 | } |
8b372562 | 691 | buf[cnt] = '\0'; |
7ce7e424 | 692 | |
8b372562 TZ |
693 | err = apply_event_filter(call, buf); |
694 | free_page((unsigned long) buf); | |
695 | if (err < 0) | |
44e9c8b7 | 696 | return err; |
0a19e53c | 697 | |
7ce7e424 TZ |
698 | *ppos += cnt; |
699 | ||
700 | return cnt; | |
701 | } | |
702 | ||
cfb180f3 TZ |
703 | static ssize_t |
704 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
705 | loff_t *ppos) | |
706 | { | |
707 | struct event_subsystem *system = filp->private_data; | |
708 | struct trace_seq *s; | |
709 | int r; | |
710 | ||
711 | if (*ppos) | |
712 | return 0; | |
713 | ||
714 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
715 | if (!s) | |
716 | return -ENOMEM; | |
717 | ||
718 | trace_seq_init(s); | |
719 | ||
8b372562 | 720 | print_subsystem_event_filter(system, s); |
4bda2d51 | 721 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
722 | |
723 | kfree(s); | |
724 | ||
725 | return r; | |
726 | } | |
727 | ||
728 | static ssize_t | |
729 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
730 | loff_t *ppos) | |
731 | { | |
732 | struct event_subsystem *system = filp->private_data; | |
8b372562 | 733 | char *buf; |
cfb180f3 TZ |
734 | int err; |
735 | ||
8b372562 | 736 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
737 | return -EINVAL; |
738 | ||
8b372562 TZ |
739 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
740 | if (!buf) | |
cfb180f3 TZ |
741 | return -ENOMEM; |
742 | ||
8b372562 TZ |
743 | if (copy_from_user(buf, ubuf, cnt)) { |
744 | free_page((unsigned long) buf); | |
745 | return -EFAULT; | |
cfb180f3 | 746 | } |
8b372562 | 747 | buf[cnt] = '\0'; |
cfb180f3 | 748 | |
8b372562 TZ |
749 | err = apply_subsystem_event_filter(system, buf); |
750 | free_page((unsigned long) buf); | |
751 | if (err < 0) | |
44e9c8b7 | 752 | return err; |
cfb180f3 TZ |
753 | |
754 | *ppos += cnt; | |
755 | ||
756 | return cnt; | |
757 | } | |
758 | ||
d1b182a8 SR |
759 | static ssize_t |
760 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
761 | { | |
762 | int (*func)(struct trace_seq *s) = filp->private_data; | |
763 | struct trace_seq *s; | |
764 | int r; | |
765 | ||
766 | if (*ppos) | |
767 | return 0; | |
768 | ||
769 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
770 | if (!s) | |
771 | return -ENOMEM; | |
772 | ||
773 | trace_seq_init(s); | |
774 | ||
775 | func(s); | |
776 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
777 | ||
778 | kfree(s); | |
779 | ||
780 | return r; | |
781 | } | |
782 | ||
b77e38aa SR |
783 | static const struct seq_operations show_event_seq_ops = { |
784 | .start = t_start, | |
785 | .next = t_next, | |
786 | .show = t_show, | |
787 | .stop = t_stop, | |
788 | }; | |
789 | ||
790 | static const struct seq_operations show_set_event_seq_ops = { | |
791 | .start = s_start, | |
792 | .next = s_next, | |
793 | .show = t_show, | |
794 | .stop = t_stop, | |
795 | }; | |
796 | ||
2314c4ae SR |
797 | static const struct file_operations ftrace_avail_fops = { |
798 | .open = ftrace_event_seq_open, | |
799 | .read = seq_read, | |
800 | .llseek = seq_lseek, | |
801 | .release = seq_release, | |
802 | }; | |
803 | ||
b77e38aa SR |
804 | static const struct file_operations ftrace_set_event_fops = { |
805 | .open = ftrace_event_seq_open, | |
806 | .read = seq_read, | |
807 | .write = ftrace_event_write, | |
808 | .llseek = seq_lseek, | |
809 | .release = seq_release, | |
810 | }; | |
811 | ||
1473e441 SR |
812 | static const struct file_operations ftrace_enable_fops = { |
813 | .open = tracing_open_generic, | |
814 | .read = event_enable_read, | |
815 | .write = event_enable_write, | |
816 | }; | |
817 | ||
981d081e SR |
818 | static const struct file_operations ftrace_event_format_fops = { |
819 | .open = tracing_open_generic, | |
820 | .read = event_format_read, | |
821 | }; | |
822 | ||
23725aee PZ |
823 | static const struct file_operations ftrace_event_id_fops = { |
824 | .open = tracing_open_generic, | |
825 | .read = event_id_read, | |
826 | }; | |
827 | ||
7ce7e424 TZ |
828 | static const struct file_operations ftrace_event_filter_fops = { |
829 | .open = tracing_open_generic, | |
830 | .read = event_filter_read, | |
831 | .write = event_filter_write, | |
832 | }; | |
833 | ||
cfb180f3 TZ |
834 | static const struct file_operations ftrace_subsystem_filter_fops = { |
835 | .open = tracing_open_generic, | |
836 | .read = subsystem_filter_read, | |
837 | .write = subsystem_filter_write, | |
838 | }; | |
839 | ||
8ae79a13 SR |
840 | static const struct file_operations ftrace_system_enable_fops = { |
841 | .open = tracing_open_generic, | |
842 | .read = system_enable_read, | |
843 | .write = system_enable_write, | |
844 | }; | |
845 | ||
d1b182a8 SR |
846 | static const struct file_operations ftrace_show_header_fops = { |
847 | .open = tracing_open_generic, | |
848 | .read = show_header, | |
849 | }; | |
850 | ||
1473e441 SR |
851 | static struct dentry *event_trace_events_dir(void) |
852 | { | |
853 | static struct dentry *d_tracer; | |
854 | static struct dentry *d_events; | |
855 | ||
856 | if (d_events) | |
857 | return d_events; | |
858 | ||
859 | d_tracer = tracing_init_dentry(); | |
860 | if (!d_tracer) | |
861 | return NULL; | |
862 | ||
863 | d_events = debugfs_create_dir("events", d_tracer); | |
864 | if (!d_events) | |
865 | pr_warning("Could not create debugfs " | |
866 | "'events' directory\n"); | |
867 | ||
868 | return d_events; | |
869 | } | |
870 | ||
6ecc2d1c SR |
871 | static LIST_HEAD(event_subsystems); |
872 | ||
873 | static struct dentry * | |
874 | event_subsystem_dir(const char *name, struct dentry *d_events) | |
875 | { | |
876 | struct event_subsystem *system; | |
e1112b4d | 877 | struct dentry *entry; |
6ecc2d1c SR |
878 | |
879 | /* First see if we did not already create this dir */ | |
880 | list_for_each_entry(system, &event_subsystems, list) { | |
dc82ec98 XG |
881 | if (strcmp(system->name, name) == 0) { |
882 | system->nr_events++; | |
6ecc2d1c | 883 | return system->entry; |
dc82ec98 | 884 | } |
6ecc2d1c SR |
885 | } |
886 | ||
887 | /* need to create new entry */ | |
888 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
889 | if (!system) { | |
890 | pr_warning("No memory to create event subsystem %s\n", | |
891 | name); | |
892 | return d_events; | |
893 | } | |
894 | ||
895 | system->entry = debugfs_create_dir(name, d_events); | |
896 | if (!system->entry) { | |
897 | pr_warning("Could not create event subsystem %s\n", | |
898 | name); | |
899 | kfree(system); | |
900 | return d_events; | |
901 | } | |
902 | ||
dc82ec98 | 903 | system->nr_events = 1; |
6d723736 SR |
904 | system->name = kstrdup(name, GFP_KERNEL); |
905 | if (!system->name) { | |
906 | debugfs_remove(system->entry); | |
907 | kfree(system); | |
908 | return d_events; | |
909 | } | |
910 | ||
6ecc2d1c SR |
911 | list_add(&system->list, &event_subsystems); |
912 | ||
30e673b2 | 913 | system->filter = NULL; |
cfb180f3 | 914 | |
8b372562 TZ |
915 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
916 | if (!system->filter) { | |
917 | pr_warning("Could not allocate filter for subsystem " | |
918 | "'%s'\n", name); | |
919 | return system->entry; | |
920 | } | |
921 | ||
e1112b4d TZ |
922 | entry = debugfs_create_file("filter", 0644, system->entry, system, |
923 | &ftrace_subsystem_filter_fops); | |
8b372562 TZ |
924 | if (!entry) { |
925 | kfree(system->filter); | |
926 | system->filter = NULL; | |
e1112b4d TZ |
927 | pr_warning("Could not create debugfs " |
928 | "'%s/filter' entry\n", name); | |
8b372562 | 929 | } |
e1112b4d | 930 | |
8ae79a13 SR |
931 | entry = trace_create_file("enable", 0644, system->entry, |
932 | (void *)system->name, | |
933 | &ftrace_system_enable_fops); | |
934 | ||
6ecc2d1c SR |
935 | return system->entry; |
936 | } | |
937 | ||
1473e441 | 938 | static int |
701970b3 SR |
939 | event_create_dir(struct ftrace_event_call *call, struct dentry *d_events, |
940 | const struct file_operations *id, | |
941 | const struct file_operations *enable, | |
942 | const struct file_operations *filter, | |
943 | const struct file_operations *format) | |
1473e441 SR |
944 | { |
945 | struct dentry *entry; | |
fd994989 | 946 | int ret; |
1473e441 | 947 | |
6ecc2d1c SR |
948 | /* |
949 | * If the trace point header did not define TRACE_SYSTEM | |
950 | * then the system would be called "TRACE_SYSTEM". | |
951 | */ | |
6d723736 | 952 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
6ecc2d1c SR |
953 | d_events = event_subsystem_dir(call->system, d_events); |
954 | ||
1473e441 SR |
955 | call->dir = debugfs_create_dir(call->name, d_events); |
956 | if (!call->dir) { | |
957 | pr_warning("Could not create debugfs " | |
958 | "'%s' directory\n", call->name); | |
959 | return -1; | |
960 | } | |
961 | ||
6d723736 SR |
962 | if (call->regfunc) |
963 | entry = trace_create_file("enable", 0644, call->dir, call, | |
701970b3 | 964 | enable); |
1473e441 | 965 | |
af6af30c | 966 | if (call->id && call->profile_enable) |
6d723736 | 967 | entry = trace_create_file("id", 0444, call->dir, call, |
701970b3 | 968 | id); |
23725aee | 969 | |
cf027f64 | 970 | if (call->define_fields) { |
14be96c9 | 971 | ret = call->define_fields(call); |
cf027f64 TZ |
972 | if (ret < 0) { |
973 | pr_warning("Could not initialize trace point" | |
974 | " events/%s\n", call->name); | |
975 | return ret; | |
976 | } | |
6d723736 | 977 | entry = trace_create_file("filter", 0644, call->dir, call, |
701970b3 | 978 | filter); |
cf027f64 TZ |
979 | } |
980 | ||
981d081e SR |
981 | /* A trace may not want to export its format */ |
982 | if (!call->show_format) | |
983 | return 0; | |
984 | ||
6d723736 | 985 | entry = trace_create_file("format", 0444, call->dir, call, |
701970b3 | 986 | format); |
6d723736 SR |
987 | |
988 | return 0; | |
989 | } | |
990 | ||
991 | #define for_each_event(event, start, end) \ | |
992 | for (event = start; \ | |
993 | (unsigned long)event < (unsigned long)end; \ | |
994 | event++) | |
995 | ||
61f919a1 | 996 | #ifdef CONFIG_MODULES |
701970b3 SR |
997 | |
998 | static LIST_HEAD(ftrace_module_file_list); | |
999 | ||
1000 | /* | |
1001 | * Modules must own their file_operations to keep up with | |
1002 | * reference counting. | |
1003 | */ | |
1004 | struct ftrace_module_file_ops { | |
1005 | struct list_head list; | |
1006 | struct module *mod; | |
1007 | struct file_operations id; | |
1008 | struct file_operations enable; | |
1009 | struct file_operations format; | |
1010 | struct file_operations filter; | |
1011 | }; | |
1012 | ||
a2ca5e03 FW |
1013 | static void remove_subsystem_dir(const char *name) |
1014 | { | |
1015 | struct event_subsystem *system; | |
1016 | ||
1017 | if (strcmp(name, TRACE_SYSTEM) == 0) | |
1018 | return; | |
1019 | ||
1020 | list_for_each_entry(system, &event_subsystems, list) { | |
1021 | if (strcmp(system->name, name) == 0) { | |
1022 | if (!--system->nr_events) { | |
1023 | struct event_filter *filter = system->filter; | |
1024 | ||
1025 | debugfs_remove_recursive(system->entry); | |
1026 | list_del(&system->list); | |
1027 | if (filter) { | |
1028 | kfree(filter->filter_string); | |
1029 | kfree(filter); | |
1030 | } | |
1031 | kfree(system->name); | |
1032 | kfree(system); | |
1033 | } | |
1034 | break; | |
1035 | } | |
1036 | } | |
1037 | } | |
1038 | ||
701970b3 SR |
1039 | static struct ftrace_module_file_ops * |
1040 | trace_create_file_ops(struct module *mod) | |
1041 | { | |
1042 | struct ftrace_module_file_ops *file_ops; | |
1043 | ||
1044 | /* | |
1045 | * This is a bit of a PITA. To allow for correct reference | |
1046 | * counting, modules must "own" their file_operations. | |
1047 | * To do this, we allocate the file operations that will be | |
1048 | * used in the event directory. | |
1049 | */ | |
1050 | ||
1051 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1052 | if (!file_ops) | |
1053 | return NULL; | |
1054 | ||
1055 | file_ops->mod = mod; | |
1056 | ||
1057 | file_ops->id = ftrace_event_id_fops; | |
1058 | file_ops->id.owner = mod; | |
1059 | ||
1060 | file_ops->enable = ftrace_enable_fops; | |
1061 | file_ops->enable.owner = mod; | |
1062 | ||
1063 | file_ops->filter = ftrace_event_filter_fops; | |
1064 | file_ops->filter.owner = mod; | |
1065 | ||
1066 | file_ops->format = ftrace_event_format_fops; | |
1067 | file_ops->format.owner = mod; | |
1068 | ||
1069 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1070 | ||
1071 | return file_ops; | |
1072 | } | |
1073 | ||
6d723736 SR |
1074 | static void trace_module_add_events(struct module *mod) |
1075 | { | |
701970b3 | 1076 | struct ftrace_module_file_ops *file_ops = NULL; |
6d723736 SR |
1077 | struct ftrace_event_call *call, *start, *end; |
1078 | struct dentry *d_events; | |
f744bd57 | 1079 | int ret; |
6d723736 SR |
1080 | |
1081 | start = mod->trace_events; | |
1082 | end = mod->trace_events + mod->num_trace_events; | |
1083 | ||
1084 | if (start == end) | |
1085 | return; | |
1086 | ||
1087 | d_events = event_trace_events_dir(); | |
1088 | if (!d_events) | |
1089 | return; | |
1090 | ||
1091 | for_each_event(call, start, end) { | |
1092 | /* The linker may leave blanks */ | |
1093 | if (!call->name) | |
1094 | continue; | |
f744bd57 JB |
1095 | if (call->raw_init) { |
1096 | ret = call->raw_init(); | |
1097 | if (ret < 0) { | |
1098 | if (ret != -ENOSYS) | |
1099 | pr_warning("Could not initialize trace " | |
1100 | "point events/%s\n", call->name); | |
1101 | continue; | |
1102 | } | |
1103 | } | |
701970b3 SR |
1104 | /* |
1105 | * This module has events, create file ops for this module | |
1106 | * if not already done. | |
1107 | */ | |
1108 | if (!file_ops) { | |
1109 | file_ops = trace_create_file_ops(mod); | |
1110 | if (!file_ops) | |
1111 | return; | |
1112 | } | |
6d723736 SR |
1113 | call->mod = mod; |
1114 | list_add(&call->list, &ftrace_events); | |
701970b3 SR |
1115 | event_create_dir(call, d_events, |
1116 | &file_ops->id, &file_ops->enable, | |
1117 | &file_ops->filter, &file_ops->format); | |
6d723736 SR |
1118 | } |
1119 | } | |
1120 | ||
1121 | static void trace_module_remove_events(struct module *mod) | |
1122 | { | |
701970b3 | 1123 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1124 | struct ftrace_event_call *call, *p; |
9456f0fa | 1125 | bool found = false; |
6d723736 | 1126 | |
110bf2b7 | 1127 | down_write(&trace_event_mutex); |
6d723736 SR |
1128 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1129 | if (call->mod == mod) { | |
9456f0fa | 1130 | found = true; |
0e907c99 | 1131 | ftrace_event_enable_disable(call, 0); |
6d723736 | 1132 | if (call->event) |
110bf2b7 | 1133 | __unregister_ftrace_event(call->event); |
6d723736 SR |
1134 | debugfs_remove_recursive(call->dir); |
1135 | list_del(&call->list); | |
2df75e41 LZ |
1136 | trace_destroy_fields(call); |
1137 | destroy_preds(call); | |
dc82ec98 | 1138 | remove_subsystem_dir(call->system); |
6d723736 SR |
1139 | } |
1140 | } | |
701970b3 SR |
1141 | |
1142 | /* Now free the file_operations */ | |
1143 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1144 | if (file_ops->mod == mod) | |
1145 | break; | |
1146 | } | |
1147 | if (&file_ops->list != &ftrace_module_file_list) { | |
1148 | list_del(&file_ops->list); | |
1149 | kfree(file_ops); | |
1150 | } | |
9456f0fa SR |
1151 | |
1152 | /* | |
1153 | * It is safest to reset the ring buffer if the module being unloaded | |
1154 | * registered any events. | |
1155 | */ | |
1156 | if (found) | |
1157 | tracing_reset_current_online_cpus(); | |
110bf2b7 | 1158 | up_write(&trace_event_mutex); |
6d723736 SR |
1159 | } |
1160 | ||
61f919a1 SR |
1161 | static int trace_module_notify(struct notifier_block *self, |
1162 | unsigned long val, void *data) | |
6d723736 SR |
1163 | { |
1164 | struct module *mod = data; | |
1165 | ||
1166 | mutex_lock(&event_mutex); | |
1167 | switch (val) { | |
1168 | case MODULE_STATE_COMING: | |
1169 | trace_module_add_events(mod); | |
1170 | break; | |
1171 | case MODULE_STATE_GOING: | |
1172 | trace_module_remove_events(mod); | |
1173 | break; | |
1174 | } | |
1175 | mutex_unlock(&event_mutex); | |
fd994989 | 1176 | |
1473e441 SR |
1177 | return 0; |
1178 | } | |
61f919a1 SR |
1179 | #else |
1180 | static int trace_module_notify(struct notifier_block *self, | |
1181 | unsigned long val, void *data) | |
1182 | { | |
1183 | return 0; | |
1184 | } | |
1185 | #endif /* CONFIG_MODULES */ | |
1473e441 | 1186 | |
6d723736 SR |
1187 | struct notifier_block trace_module_nb = { |
1188 | .notifier_call = trace_module_notify, | |
1189 | .priority = 0, | |
1190 | }; | |
1191 | ||
a59fd602 SR |
1192 | extern struct ftrace_event_call __start_ftrace_events[]; |
1193 | extern struct ftrace_event_call __stop_ftrace_events[]; | |
1194 | ||
020e5f85 LZ |
1195 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
1196 | ||
1197 | static __init int setup_trace_event(char *str) | |
1198 | { | |
1199 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
1200 | ring_buffer_expanded = 1; | |
1201 | tracing_selftest_disabled = 1; | |
1202 | ||
1203 | return 1; | |
1204 | } | |
1205 | __setup("trace_event=", setup_trace_event); | |
1206 | ||
b77e38aa SR |
1207 | static __init int event_trace_init(void) |
1208 | { | |
a59fd602 | 1209 | struct ftrace_event_call *call; |
b77e38aa SR |
1210 | struct dentry *d_tracer; |
1211 | struct dentry *entry; | |
1473e441 | 1212 | struct dentry *d_events; |
6d723736 | 1213 | int ret; |
020e5f85 LZ |
1214 | char *buf = bootup_event_buf; |
1215 | char *token; | |
b77e38aa SR |
1216 | |
1217 | d_tracer = tracing_init_dentry(); | |
1218 | if (!d_tracer) | |
1219 | return 0; | |
1220 | ||
2314c4ae SR |
1221 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
1222 | (void *)&show_event_seq_ops, | |
1223 | &ftrace_avail_fops); | |
1224 | if (!entry) | |
1225 | pr_warning("Could not create debugfs " | |
1226 | "'available_events' entry\n"); | |
1227 | ||
b77e38aa SR |
1228 | entry = debugfs_create_file("set_event", 0644, d_tracer, |
1229 | (void *)&show_set_event_seq_ops, | |
1230 | &ftrace_set_event_fops); | |
1231 | if (!entry) | |
1232 | pr_warning("Could not create debugfs " | |
1233 | "'set_event' entry\n"); | |
1234 | ||
1473e441 SR |
1235 | d_events = event_trace_events_dir(); |
1236 | if (!d_events) | |
1237 | return 0; | |
1238 | ||
d1b182a8 SR |
1239 | /* ring buffer internal formats */ |
1240 | trace_create_file("header_page", 0444, d_events, | |
1241 | ring_buffer_print_page_header, | |
1242 | &ftrace_show_header_fops); | |
1243 | ||
1244 | trace_create_file("header_event", 0444, d_events, | |
1245 | ring_buffer_print_entry_header, | |
1246 | &ftrace_show_header_fops); | |
1247 | ||
8ae79a13 | 1248 | trace_create_file("enable", 0644, d_events, |
8f31bfe5 | 1249 | NULL, &ftrace_system_enable_fops); |
8ae79a13 | 1250 | |
6d723736 | 1251 | for_each_event(call, __start_ftrace_events, __stop_ftrace_events) { |
1473e441 SR |
1252 | /* The linker may leave blanks */ |
1253 | if (!call->name) | |
1254 | continue; | |
f744bd57 JB |
1255 | if (call->raw_init) { |
1256 | ret = call->raw_init(); | |
1257 | if (ret < 0) { | |
1258 | if (ret != -ENOSYS) | |
1259 | pr_warning("Could not initialize trace " | |
1260 | "point events/%s\n", call->name); | |
1261 | continue; | |
1262 | } | |
1263 | } | |
a59fd602 | 1264 | list_add(&call->list, &ftrace_events); |
701970b3 SR |
1265 | event_create_dir(call, d_events, &ftrace_event_id_fops, |
1266 | &ftrace_enable_fops, &ftrace_event_filter_fops, | |
1267 | &ftrace_event_format_fops); | |
1473e441 SR |
1268 | } |
1269 | ||
020e5f85 LZ |
1270 | while (true) { |
1271 | token = strsep(&buf, ","); | |
1272 | ||
1273 | if (!token) | |
1274 | break; | |
1275 | if (!*token) | |
1276 | continue; | |
1277 | ||
1278 | ret = ftrace_set_clr_event(token, 1); | |
1279 | if (ret) | |
1280 | pr_warning("Failed to enable trace event: %s\n", token); | |
1281 | } | |
1282 | ||
6d723736 | 1283 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 1284 | if (ret) |
6d723736 SR |
1285 | pr_warning("Failed to register trace events module notifier\n"); |
1286 | ||
b77e38aa SR |
1287 | return 0; |
1288 | } | |
1289 | fs_initcall(event_trace_init); | |
e6187007 SR |
1290 | |
1291 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1292 | ||
1293 | static DEFINE_SPINLOCK(test_spinlock); | |
1294 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
1295 | static DEFINE_MUTEX(test_mutex); | |
1296 | ||
1297 | static __init void test_work(struct work_struct *dummy) | |
1298 | { | |
1299 | spin_lock(&test_spinlock); | |
1300 | spin_lock_irq(&test_spinlock_irq); | |
1301 | udelay(1); | |
1302 | spin_unlock_irq(&test_spinlock_irq); | |
1303 | spin_unlock(&test_spinlock); | |
1304 | ||
1305 | mutex_lock(&test_mutex); | |
1306 | msleep(1); | |
1307 | mutex_unlock(&test_mutex); | |
1308 | } | |
1309 | ||
1310 | static __init int event_test_thread(void *unused) | |
1311 | { | |
1312 | void *test_malloc; | |
1313 | ||
1314 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
1315 | if (!test_malloc) | |
1316 | pr_info("failed to kmalloc\n"); | |
1317 | ||
1318 | schedule_on_each_cpu(test_work); | |
1319 | ||
1320 | kfree(test_malloc); | |
1321 | ||
1322 | set_current_state(TASK_INTERRUPTIBLE); | |
1323 | while (!kthread_should_stop()) | |
1324 | schedule(); | |
1325 | ||
1326 | return 0; | |
1327 | } | |
1328 | ||
1329 | /* | |
1330 | * Do various things that may trigger events. | |
1331 | */ | |
1332 | static __init void event_test_stuff(void) | |
1333 | { | |
1334 | struct task_struct *test_thread; | |
1335 | ||
1336 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
1337 | msleep(1); | |
1338 | kthread_stop(test_thread); | |
1339 | } | |
1340 | ||
1341 | /* | |
1342 | * For every trace event defined, we will test each trace point separately, | |
1343 | * and then by groups, and finally all trace points. | |
1344 | */ | |
9ea21c1e | 1345 | static __init void event_trace_self_tests(void) |
e6187007 SR |
1346 | { |
1347 | struct ftrace_event_call *call; | |
1348 | struct event_subsystem *system; | |
e6187007 SR |
1349 | int ret; |
1350 | ||
1351 | pr_info("Running tests on trace events:\n"); | |
1352 | ||
1353 | list_for_each_entry(call, &ftrace_events, list) { | |
1354 | ||
1355 | /* Only test those that have a regfunc */ | |
1356 | if (!call->regfunc) | |
1357 | continue; | |
1358 | ||
1359 | pr_info("Testing event %s: ", call->name); | |
1360 | ||
1361 | /* | |
1362 | * If an event is already enabled, someone is using | |
1363 | * it and the self test should not be on. | |
1364 | */ | |
1365 | if (call->enabled) { | |
1366 | pr_warning("Enabled event during self test!\n"); | |
1367 | WARN_ON_ONCE(1); | |
1368 | continue; | |
1369 | } | |
1370 | ||
0e907c99 | 1371 | ftrace_event_enable_disable(call, 1); |
e6187007 | 1372 | event_test_stuff(); |
0e907c99 | 1373 | ftrace_event_enable_disable(call, 0); |
e6187007 SR |
1374 | |
1375 | pr_cont("OK\n"); | |
1376 | } | |
1377 | ||
1378 | /* Now test at the sub system level */ | |
1379 | ||
1380 | pr_info("Running tests on trace event systems:\n"); | |
1381 | ||
1382 | list_for_each_entry(system, &event_subsystems, list) { | |
1383 | ||
1384 | /* the ftrace system is special, skip it */ | |
1385 | if (strcmp(system->name, "ftrace") == 0) | |
1386 | continue; | |
1387 | ||
1388 | pr_info("Testing event system %s: ", system->name); | |
1389 | ||
8f31bfe5 | 1390 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1); |
e6187007 SR |
1391 | if (WARN_ON_ONCE(ret)) { |
1392 | pr_warning("error enabling system %s\n", | |
1393 | system->name); | |
1394 | continue; | |
1395 | } | |
1396 | ||
1397 | event_test_stuff(); | |
1398 | ||
8f31bfe5 | 1399 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0); |
e6187007 SR |
1400 | if (WARN_ON_ONCE(ret)) |
1401 | pr_warning("error disabling system %s\n", | |
1402 | system->name); | |
1403 | ||
1404 | pr_cont("OK\n"); | |
1405 | } | |
1406 | ||
1407 | /* Test with all events enabled */ | |
1408 | ||
1409 | pr_info("Running tests on all trace events:\n"); | |
1410 | pr_info("Testing all events: "); | |
1411 | ||
8f31bfe5 | 1412 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1); |
e6187007 | 1413 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 1414 | pr_warning("error enabling all events\n"); |
9ea21c1e | 1415 | return; |
e6187007 SR |
1416 | } |
1417 | ||
1418 | event_test_stuff(); | |
1419 | ||
1420 | /* reset sysname */ | |
8f31bfe5 | 1421 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0); |
e6187007 SR |
1422 | if (WARN_ON_ONCE(ret)) { |
1423 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 1424 | return; |
e6187007 SR |
1425 | } |
1426 | ||
1427 | pr_cont("OK\n"); | |
9ea21c1e SR |
1428 | } |
1429 | ||
1430 | #ifdef CONFIG_FUNCTION_TRACER | |
1431 | ||
1432 | static DEFINE_PER_CPU(atomic_t, test_event_disable); | |
1433 | ||
1434 | static void | |
1435 | function_test_events_call(unsigned long ip, unsigned long parent_ip) | |
1436 | { | |
1437 | struct ring_buffer_event *event; | |
e77405ad | 1438 | struct ring_buffer *buffer; |
9ea21c1e SR |
1439 | struct ftrace_entry *entry; |
1440 | unsigned long flags; | |
1441 | long disabled; | |
1442 | int resched; | |
1443 | int cpu; | |
1444 | int pc; | |
1445 | ||
1446 | pc = preempt_count(); | |
1447 | resched = ftrace_preempt_disable(); | |
1448 | cpu = raw_smp_processor_id(); | |
1449 | disabled = atomic_inc_return(&per_cpu(test_event_disable, cpu)); | |
1450 | ||
1451 | if (disabled != 1) | |
1452 | goto out; | |
1453 | ||
1454 | local_save_flags(flags); | |
1455 | ||
e77405ad SR |
1456 | event = trace_current_buffer_lock_reserve(&buffer, |
1457 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
1458 | flags, pc); |
1459 | if (!event) | |
1460 | goto out; | |
1461 | entry = ring_buffer_event_data(event); | |
1462 | entry->ip = ip; | |
1463 | entry->parent_ip = parent_ip; | |
1464 | ||
e77405ad | 1465 | trace_nowake_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
1466 | |
1467 | out: | |
1468 | atomic_dec(&per_cpu(test_event_disable, cpu)); | |
1469 | ftrace_preempt_enable(resched); | |
1470 | } | |
1471 | ||
1472 | static struct ftrace_ops trace_ops __initdata = | |
1473 | { | |
1474 | .func = function_test_events_call, | |
1475 | }; | |
1476 | ||
1477 | static __init void event_trace_self_test_with_function(void) | |
1478 | { | |
1479 | register_ftrace_function(&trace_ops); | |
1480 | pr_info("Running tests again, along with the function tracer\n"); | |
1481 | event_trace_self_tests(); | |
1482 | unregister_ftrace_function(&trace_ops); | |
1483 | } | |
1484 | #else | |
1485 | static __init void event_trace_self_test_with_function(void) | |
1486 | { | |
1487 | } | |
1488 | #endif | |
1489 | ||
1490 | static __init int event_trace_self_tests_init(void) | |
1491 | { | |
020e5f85 LZ |
1492 | if (!tracing_selftest_disabled) { |
1493 | event_trace_self_tests(); | |
1494 | event_trace_self_test_with_function(); | |
1495 | } | |
e6187007 SR |
1496 | |
1497 | return 0; | |
1498 | } | |
1499 | ||
28d20e2d | 1500 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
1501 | |
1502 | #endif |