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 | ||
cf027f64 | 30 | int trace_define_field(struct ftrace_event_call *call, char *type, |
a118e4d1 | 31 | char *name, int offset, int size, int is_signed) |
cf027f64 TZ |
32 | { |
33 | struct ftrace_event_field *field; | |
34 | ||
fe9f57f2 | 35 | field = kzalloc(sizeof(*field), GFP_KERNEL); |
cf027f64 TZ |
36 | if (!field) |
37 | goto err; | |
fe9f57f2 | 38 | |
cf027f64 TZ |
39 | field->name = kstrdup(name, GFP_KERNEL); |
40 | if (!field->name) | |
41 | goto err; | |
fe9f57f2 | 42 | |
cf027f64 TZ |
43 | field->type = kstrdup(type, GFP_KERNEL); |
44 | if (!field->type) | |
45 | goto err; | |
fe9f57f2 | 46 | |
cf027f64 TZ |
47 | field->offset = offset; |
48 | field->size = size; | |
a118e4d1 | 49 | field->is_signed = is_signed; |
cf027f64 TZ |
50 | list_add(&field->link, &call->fields); |
51 | ||
52 | return 0; | |
fe9f57f2 | 53 | |
cf027f64 TZ |
54 | err: |
55 | if (field) { | |
56 | kfree(field->name); | |
57 | kfree(field->type); | |
58 | } | |
59 | kfree(field); | |
fe9f57f2 | 60 | |
cf027f64 TZ |
61 | return -ENOMEM; |
62 | } | |
17c873ec | 63 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 64 | |
2df75e41 LZ |
65 | #ifdef CONFIG_MODULES |
66 | ||
67 | static void trace_destroy_fields(struct ftrace_event_call *call) | |
68 | { | |
69 | struct ftrace_event_field *field, *next; | |
70 | ||
71 | list_for_each_entry_safe(field, next, &call->fields, link) { | |
72 | list_del(&field->link); | |
73 | kfree(field->type); | |
74 | kfree(field->name); | |
75 | kfree(field); | |
76 | } | |
77 | } | |
78 | ||
79 | #endif /* CONFIG_MODULES */ | |
80 | ||
fd994989 SR |
81 | static void ftrace_event_enable_disable(struct ftrace_event_call *call, |
82 | int enable) | |
83 | { | |
fd994989 SR |
84 | switch (enable) { |
85 | case 0: | |
86 | if (call->enabled) { | |
87 | call->enabled = 0; | |
b11c53e1 | 88 | tracing_stop_cmdline_record(); |
fd994989 SR |
89 | call->unregfunc(); |
90 | } | |
fd994989 SR |
91 | break; |
92 | case 1: | |
da4d0302 | 93 | if (!call->enabled) { |
fd994989 | 94 | call->enabled = 1; |
b11c53e1 | 95 | tracing_start_cmdline_record(); |
fd994989 SR |
96 | call->regfunc(); |
97 | } | |
fd994989 SR |
98 | break; |
99 | } | |
100 | } | |
101 | ||
0e907c99 Z |
102 | static void ftrace_clear_events(void) |
103 | { | |
104 | struct ftrace_event_call *call; | |
105 | ||
106 | mutex_lock(&event_mutex); | |
107 | list_for_each_entry(call, &ftrace_events, list) { | |
108 | ftrace_event_enable_disable(call, 0); | |
109 | } | |
110 | mutex_unlock(&event_mutex); | |
111 | } | |
112 | ||
8f31bfe5 LZ |
113 | /* |
114 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
115 | */ | |
116 | static int __ftrace_set_clr_event(const char *match, const char *sub, | |
117 | const char *event, int set) | |
b77e38aa | 118 | { |
a59fd602 | 119 | struct ftrace_event_call *call; |
29f93943 | 120 | int ret = -EINVAL; |
8f31bfe5 LZ |
121 | |
122 | mutex_lock(&event_mutex); | |
123 | list_for_each_entry(call, &ftrace_events, list) { | |
124 | ||
125 | if (!call->name || !call->regfunc) | |
126 | continue; | |
127 | ||
128 | if (match && | |
129 | strcmp(match, call->name) != 0 && | |
130 | strcmp(match, call->system) != 0) | |
131 | continue; | |
132 | ||
133 | if (sub && strcmp(sub, call->system) != 0) | |
134 | continue; | |
135 | ||
136 | if (event && strcmp(event, call->name) != 0) | |
137 | continue; | |
138 | ||
139 | ftrace_event_enable_disable(call, set); | |
140 | ||
141 | ret = 0; | |
142 | } | |
143 | mutex_unlock(&event_mutex); | |
144 | ||
145 | return ret; | |
146 | } | |
147 | ||
148 | static int ftrace_set_clr_event(char *buf, int set) | |
149 | { | |
b628b3e6 | 150 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
151 | |
152 | /* | |
153 | * The buf format can be <subsystem>:<event-name> | |
154 | * *:<event-name> means any event by that name. | |
155 | * :<event-name> is the same. | |
156 | * | |
157 | * <subsystem>:* means all events in that subsystem | |
158 | * <subsystem>: means the same. | |
159 | * | |
160 | * <name> (no ':') means all events in a subsystem with | |
161 | * the name <name> or any event that matches <name> | |
162 | */ | |
163 | ||
164 | match = strsep(&buf, ":"); | |
165 | if (buf) { | |
166 | sub = match; | |
167 | event = buf; | |
168 | match = NULL; | |
169 | ||
170 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
171 | sub = NULL; | |
172 | if (!strlen(event) || strcmp(event, "*") == 0) | |
173 | event = NULL; | |
174 | } | |
b77e38aa | 175 | |
8f31bfe5 | 176 | return __ftrace_set_clr_event(match, sub, event, set); |
b77e38aa SR |
177 | } |
178 | ||
4671c794 SR |
179 | /** |
180 | * trace_set_clr_event - enable or disable an event | |
181 | * @system: system name to match (NULL for any system) | |
182 | * @event: event name to match (NULL for all events, within system) | |
183 | * @set: 1 to enable, 0 to disable | |
184 | * | |
185 | * This is a way for other parts of the kernel to enable or disable | |
186 | * event recording. | |
187 | * | |
188 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
189 | * registered events. | |
190 | */ | |
191 | int trace_set_clr_event(const char *system, const char *event, int set) | |
192 | { | |
193 | return __ftrace_set_clr_event(NULL, system, event, set); | |
194 | } | |
195 | ||
b77e38aa SR |
196 | /* 128 should be much more than enough */ |
197 | #define EVENT_BUF_SIZE 127 | |
198 | ||
199 | static ssize_t | |
200 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
201 | size_t cnt, loff_t *ppos) | |
202 | { | |
203 | size_t read = 0; | |
204 | int i, set = 1; | |
205 | ssize_t ret; | |
206 | char *buf; | |
207 | char ch; | |
208 | ||
209 | if (!cnt || cnt < 0) | |
210 | return 0; | |
211 | ||
1852fcce SR |
212 | ret = tracing_update_buffers(); |
213 | if (ret < 0) | |
214 | return ret; | |
215 | ||
b77e38aa SR |
216 | ret = get_user(ch, ubuf++); |
217 | if (ret) | |
218 | return ret; | |
219 | read++; | |
220 | cnt--; | |
221 | ||
222 | /* skip white space */ | |
223 | while (cnt && isspace(ch)) { | |
224 | ret = get_user(ch, ubuf++); | |
225 | if (ret) | |
226 | return ret; | |
227 | read++; | |
228 | cnt--; | |
229 | } | |
230 | ||
231 | /* Only white space found? */ | |
232 | if (isspace(ch)) { | |
233 | file->f_pos += read; | |
234 | ret = read; | |
235 | return ret; | |
236 | } | |
237 | ||
238 | buf = kmalloc(EVENT_BUF_SIZE+1, GFP_KERNEL); | |
239 | if (!buf) | |
240 | return -ENOMEM; | |
241 | ||
242 | if (cnt > EVENT_BUF_SIZE) | |
243 | cnt = EVENT_BUF_SIZE; | |
244 | ||
245 | i = 0; | |
246 | while (cnt && !isspace(ch)) { | |
247 | if (!i && ch == '!') | |
248 | set = 0; | |
249 | else | |
250 | buf[i++] = ch; | |
251 | ||
252 | ret = get_user(ch, ubuf++); | |
253 | if (ret) | |
254 | goto out_free; | |
255 | read++; | |
256 | cnt--; | |
257 | } | |
258 | buf[i] = 0; | |
259 | ||
260 | file->f_pos += read; | |
261 | ||
262 | ret = ftrace_set_clr_event(buf, set); | |
263 | if (ret) | |
264 | goto out_free; | |
265 | ||
266 | ret = read; | |
267 | ||
268 | out_free: | |
269 | kfree(buf); | |
270 | ||
271 | return ret; | |
272 | } | |
273 | ||
274 | static void * | |
275 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
276 | { | |
a59fd602 SR |
277 | struct list_head *list = m->private; |
278 | struct ftrace_event_call *call; | |
b77e38aa SR |
279 | |
280 | (*pos)++; | |
281 | ||
40e26815 | 282 | for (;;) { |
a59fd602 | 283 | if (list == &ftrace_events) |
40e26815 SR |
284 | return NULL; |
285 | ||
a59fd602 SR |
286 | call = list_entry(list, struct ftrace_event_call, list); |
287 | ||
40e26815 SR |
288 | /* |
289 | * The ftrace subsystem is for showing formats only. | |
290 | * They can not be enabled or disabled via the event files. | |
291 | */ | |
292 | if (call->regfunc) | |
293 | break; | |
294 | ||
a59fd602 | 295 | list = list->next; |
40e26815 | 296 | } |
b77e38aa | 297 | |
a59fd602 | 298 | m->private = list->next; |
b77e38aa SR |
299 | |
300 | return call; | |
301 | } | |
302 | ||
303 | static void *t_start(struct seq_file *m, loff_t *pos) | |
304 | { | |
e1c7e2a6 LZ |
305 | struct ftrace_event_call *call = NULL; |
306 | loff_t l; | |
307 | ||
20c8928a | 308 | mutex_lock(&event_mutex); |
e1c7e2a6 LZ |
309 | |
310 | m->private = ftrace_events.next; | |
311 | for (l = 0; l <= *pos; ) { | |
312 | call = t_next(m, NULL, &l); | |
313 | if (!call) | |
314 | break; | |
315 | } | |
316 | return call; | |
b77e38aa SR |
317 | } |
318 | ||
319 | static void * | |
320 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
321 | { | |
a59fd602 SR |
322 | struct list_head *list = m->private; |
323 | struct ftrace_event_call *call; | |
b77e38aa SR |
324 | |
325 | (*pos)++; | |
326 | ||
327 | retry: | |
a59fd602 | 328 | if (list == &ftrace_events) |
b77e38aa SR |
329 | return NULL; |
330 | ||
a59fd602 SR |
331 | call = list_entry(list, struct ftrace_event_call, list); |
332 | ||
b77e38aa | 333 | if (!call->enabled) { |
a59fd602 | 334 | list = list->next; |
b77e38aa SR |
335 | goto retry; |
336 | } | |
337 | ||
a59fd602 | 338 | m->private = list->next; |
b77e38aa SR |
339 | |
340 | return call; | |
341 | } | |
342 | ||
343 | static void *s_start(struct seq_file *m, loff_t *pos) | |
344 | { | |
e1c7e2a6 LZ |
345 | struct ftrace_event_call *call = NULL; |
346 | loff_t l; | |
347 | ||
20c8928a | 348 | mutex_lock(&event_mutex); |
e1c7e2a6 LZ |
349 | |
350 | m->private = ftrace_events.next; | |
351 | for (l = 0; l <= *pos; ) { | |
352 | call = s_next(m, NULL, &l); | |
353 | if (!call) | |
354 | break; | |
355 | } | |
356 | return call; | |
b77e38aa SR |
357 | } |
358 | ||
359 | static int t_show(struct seq_file *m, void *v) | |
360 | { | |
361 | struct ftrace_event_call *call = v; | |
362 | ||
b628b3e6 SR |
363 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
364 | seq_printf(m, "%s:", call->system); | |
b77e38aa SR |
365 | seq_printf(m, "%s\n", call->name); |
366 | ||
367 | return 0; | |
368 | } | |
369 | ||
370 | static void t_stop(struct seq_file *m, void *p) | |
371 | { | |
20c8928a | 372 | mutex_unlock(&event_mutex); |
b77e38aa SR |
373 | } |
374 | ||
375 | static int | |
376 | ftrace_event_seq_open(struct inode *inode, struct file *file) | |
377 | { | |
b77e38aa SR |
378 | const struct seq_operations *seq_ops; |
379 | ||
380 | if ((file->f_mode & FMODE_WRITE) && | |
8650ae32 | 381 | (file->f_flags & O_TRUNC)) |
b77e38aa SR |
382 | ftrace_clear_events(); |
383 | ||
384 | seq_ops = inode->i_private; | |
20c8928a | 385 | return seq_open(file, seq_ops); |
b77e38aa SR |
386 | } |
387 | ||
1473e441 SR |
388 | static ssize_t |
389 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
390 | loff_t *ppos) | |
391 | { | |
392 | struct ftrace_event_call *call = filp->private_data; | |
393 | char *buf; | |
394 | ||
da4d0302 | 395 | if (call->enabled) |
1473e441 SR |
396 | buf = "1\n"; |
397 | else | |
398 | buf = "0\n"; | |
399 | ||
400 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
401 | } | |
402 | ||
403 | static ssize_t | |
404 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
405 | loff_t *ppos) | |
406 | { | |
407 | struct ftrace_event_call *call = filp->private_data; | |
408 | char buf[64]; | |
409 | unsigned long val; | |
410 | int ret; | |
411 | ||
412 | if (cnt >= sizeof(buf)) | |
413 | return -EINVAL; | |
414 | ||
415 | if (copy_from_user(&buf, ubuf, cnt)) | |
416 | return -EFAULT; | |
417 | ||
418 | buf[cnt] = 0; | |
419 | ||
420 | ret = strict_strtoul(buf, 10, &val); | |
421 | if (ret < 0) | |
422 | return ret; | |
423 | ||
1852fcce SR |
424 | ret = tracing_update_buffers(); |
425 | if (ret < 0) | |
426 | return ret; | |
427 | ||
1473e441 SR |
428 | switch (val) { |
429 | case 0: | |
1473e441 | 430 | case 1: |
11a241a3 | 431 | mutex_lock(&event_mutex); |
fd994989 | 432 | ftrace_event_enable_disable(call, val); |
11a241a3 | 433 | mutex_unlock(&event_mutex); |
1473e441 SR |
434 | break; |
435 | ||
436 | default: | |
437 | return -EINVAL; | |
438 | } | |
439 | ||
440 | *ppos += cnt; | |
441 | ||
442 | return cnt; | |
443 | } | |
444 | ||
8ae79a13 SR |
445 | static ssize_t |
446 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
447 | loff_t *ppos) | |
448 | { | |
c142b15d | 449 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
8ae79a13 SR |
450 | const char *system = filp->private_data; |
451 | struct ftrace_event_call *call; | |
452 | char buf[2]; | |
c142b15d | 453 | int set = 0; |
8ae79a13 SR |
454 | int ret; |
455 | ||
8ae79a13 SR |
456 | mutex_lock(&event_mutex); |
457 | list_for_each_entry(call, &ftrace_events, list) { | |
458 | if (!call->name || !call->regfunc) | |
459 | continue; | |
460 | ||
8f31bfe5 | 461 | if (system && strcmp(call->system, system) != 0) |
8ae79a13 SR |
462 | continue; |
463 | ||
464 | /* | |
465 | * We need to find out if all the events are set | |
466 | * or if all events or cleared, or if we have | |
467 | * a mixture. | |
468 | */ | |
c142b15d LZ |
469 | set |= (1 << !!call->enabled); |
470 | ||
8ae79a13 SR |
471 | /* |
472 | * If we have a mixture, no need to look further. | |
473 | */ | |
c142b15d | 474 | if (set == 3) |
8ae79a13 SR |
475 | break; |
476 | } | |
477 | mutex_unlock(&event_mutex); | |
478 | ||
c142b15d | 479 | buf[0] = set_to_char[set]; |
8ae79a13 | 480 | buf[1] = '\n'; |
8ae79a13 SR |
481 | |
482 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
483 | ||
484 | return ret; | |
485 | } | |
486 | ||
487 | static ssize_t | |
488 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
489 | loff_t *ppos) | |
490 | { | |
491 | const char *system = filp->private_data; | |
492 | unsigned long val; | |
8ae79a13 SR |
493 | char buf[64]; |
494 | ssize_t ret; | |
495 | ||
496 | if (cnt >= sizeof(buf)) | |
497 | return -EINVAL; | |
498 | ||
499 | if (copy_from_user(&buf, ubuf, cnt)) | |
500 | return -EFAULT; | |
501 | ||
502 | buf[cnt] = 0; | |
503 | ||
504 | ret = strict_strtoul(buf, 10, &val); | |
505 | if (ret < 0) | |
506 | return ret; | |
507 | ||
508 | ret = tracing_update_buffers(); | |
509 | if (ret < 0) | |
510 | return ret; | |
511 | ||
8f31bfe5 | 512 | if (val != 0 && val != 1) |
8ae79a13 | 513 | return -EINVAL; |
8ae79a13 | 514 | |
8f31bfe5 | 515 | ret = __ftrace_set_clr_event(NULL, system, NULL, val); |
8ae79a13 | 516 | if (ret) |
8f31bfe5 | 517 | goto out; |
8ae79a13 SR |
518 | |
519 | ret = cnt; | |
520 | ||
8f31bfe5 | 521 | out: |
8ae79a13 SR |
522 | *ppos += cnt; |
523 | ||
524 | return ret; | |
525 | } | |
526 | ||
75db37d2 SR |
527 | extern char *__bad_type_size(void); |
528 | ||
91729ef9 | 529 | #undef FIELD |
156b5f17 | 530 | #define FIELD(type, name) \ |
75db37d2 | 531 | sizeof(type) != sizeof(field.name) ? __bad_type_size() : \ |
cf027f64 TZ |
532 | #type, "common_" #name, offsetof(typeof(field), name), \ |
533 | sizeof(field.name) | |
91729ef9 SR |
534 | |
535 | static int trace_write_header(struct trace_seq *s) | |
536 | { | |
537 | struct trace_entry field; | |
538 | ||
539 | /* struct trace_entry */ | |
540 | return trace_seq_printf(s, | |
ce8eb2bf SR |
541 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" |
542 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
543 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
544 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
545 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
91729ef9 | 546 | "\n", |
89ec0dee | 547 | FIELD(unsigned short, type), |
91729ef9 SR |
548 | FIELD(unsigned char, flags), |
549 | FIELD(unsigned char, preempt_count), | |
550 | FIELD(int, pid), | |
551 | FIELD(int, tgid)); | |
552 | } | |
da4d0302 | 553 | |
981d081e SR |
554 | static ssize_t |
555 | event_format_read(struct file *filp, char __user *ubuf, size_t cnt, | |
556 | loff_t *ppos) | |
557 | { | |
558 | struct ftrace_event_call *call = filp->private_data; | |
559 | struct trace_seq *s; | |
560 | char *buf; | |
561 | int r; | |
562 | ||
c269fc8c TZ |
563 | if (*ppos) |
564 | return 0; | |
565 | ||
981d081e SR |
566 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
567 | if (!s) | |
568 | return -ENOMEM; | |
569 | ||
570 | trace_seq_init(s); | |
571 | ||
c5e4e192 SR |
572 | /* If any of the first writes fail, so will the show_format. */ |
573 | ||
574 | trace_seq_printf(s, "name: %s\n", call->name); | |
575 | trace_seq_printf(s, "ID: %d\n", call->id); | |
576 | trace_seq_printf(s, "format:\n"); | |
91729ef9 SR |
577 | trace_write_header(s); |
578 | ||
981d081e SR |
579 | r = call->show_format(s); |
580 | if (!r) { | |
581 | /* | |
582 | * ug! The format output is bigger than a PAGE!! | |
583 | */ | |
584 | buf = "FORMAT TOO BIG\n"; | |
585 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
586 | buf, strlen(buf)); | |
587 | goto out; | |
588 | } | |
589 | ||
590 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
591 | s->buffer, s->len); | |
592 | out: | |
593 | kfree(s); | |
594 | return r; | |
595 | } | |
596 | ||
23725aee PZ |
597 | static ssize_t |
598 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
599 | { | |
600 | struct ftrace_event_call *call = filp->private_data; | |
601 | struct trace_seq *s; | |
602 | int r; | |
603 | ||
604 | if (*ppos) | |
605 | return 0; | |
606 | ||
607 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
608 | if (!s) | |
609 | return -ENOMEM; | |
610 | ||
611 | trace_seq_init(s); | |
612 | trace_seq_printf(s, "%d\n", call->id); | |
613 | ||
614 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
615 | s->buffer, s->len); | |
616 | kfree(s); | |
617 | return r; | |
618 | } | |
619 | ||
7ce7e424 TZ |
620 | static ssize_t |
621 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
622 | loff_t *ppos) | |
623 | { | |
624 | struct ftrace_event_call *call = filp->private_data; | |
625 | struct trace_seq *s; | |
626 | int r; | |
627 | ||
628 | if (*ppos) | |
629 | return 0; | |
630 | ||
631 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
632 | if (!s) | |
633 | return -ENOMEM; | |
634 | ||
635 | trace_seq_init(s); | |
636 | ||
8b372562 | 637 | print_event_filter(call, s); |
4bda2d51 | 638 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
639 | |
640 | kfree(s); | |
641 | ||
642 | return r; | |
643 | } | |
644 | ||
645 | static ssize_t | |
646 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
647 | loff_t *ppos) | |
648 | { | |
649 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 650 | char *buf; |
7ce7e424 TZ |
651 | int err; |
652 | ||
8b372562 | 653 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
654 | return -EINVAL; |
655 | ||
8b372562 TZ |
656 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
657 | if (!buf) | |
7ce7e424 TZ |
658 | return -ENOMEM; |
659 | ||
8b372562 TZ |
660 | if (copy_from_user(buf, ubuf, cnt)) { |
661 | free_page((unsigned long) buf); | |
662 | return -EFAULT; | |
7ce7e424 | 663 | } |
8b372562 | 664 | buf[cnt] = '\0'; |
7ce7e424 | 665 | |
8b372562 TZ |
666 | err = apply_event_filter(call, buf); |
667 | free_page((unsigned long) buf); | |
668 | if (err < 0) | |
44e9c8b7 | 669 | return err; |
0a19e53c | 670 | |
7ce7e424 TZ |
671 | *ppos += cnt; |
672 | ||
673 | return cnt; | |
674 | } | |
675 | ||
cfb180f3 TZ |
676 | static ssize_t |
677 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
678 | loff_t *ppos) | |
679 | { | |
680 | struct event_subsystem *system = filp->private_data; | |
681 | struct trace_seq *s; | |
682 | int r; | |
683 | ||
684 | if (*ppos) | |
685 | return 0; | |
686 | ||
687 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
688 | if (!s) | |
689 | return -ENOMEM; | |
690 | ||
691 | trace_seq_init(s); | |
692 | ||
8b372562 | 693 | print_subsystem_event_filter(system, s); |
4bda2d51 | 694 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
695 | |
696 | kfree(s); | |
697 | ||
698 | return r; | |
699 | } | |
700 | ||
701 | static ssize_t | |
702 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
703 | loff_t *ppos) | |
704 | { | |
705 | struct event_subsystem *system = filp->private_data; | |
8b372562 | 706 | char *buf; |
cfb180f3 TZ |
707 | int err; |
708 | ||
8b372562 | 709 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
710 | return -EINVAL; |
711 | ||
8b372562 TZ |
712 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
713 | if (!buf) | |
cfb180f3 TZ |
714 | return -ENOMEM; |
715 | ||
8b372562 TZ |
716 | if (copy_from_user(buf, ubuf, cnt)) { |
717 | free_page((unsigned long) buf); | |
718 | return -EFAULT; | |
cfb180f3 | 719 | } |
8b372562 | 720 | buf[cnt] = '\0'; |
cfb180f3 | 721 | |
8b372562 TZ |
722 | err = apply_subsystem_event_filter(system, buf); |
723 | free_page((unsigned long) buf); | |
724 | if (err < 0) | |
44e9c8b7 | 725 | return err; |
cfb180f3 TZ |
726 | |
727 | *ppos += cnt; | |
728 | ||
729 | return cnt; | |
730 | } | |
731 | ||
d1b182a8 SR |
732 | static ssize_t |
733 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
734 | { | |
735 | int (*func)(struct trace_seq *s) = filp->private_data; | |
736 | struct trace_seq *s; | |
737 | int r; | |
738 | ||
739 | if (*ppos) | |
740 | return 0; | |
741 | ||
742 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
743 | if (!s) | |
744 | return -ENOMEM; | |
745 | ||
746 | trace_seq_init(s); | |
747 | ||
748 | func(s); | |
749 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
750 | ||
751 | kfree(s); | |
752 | ||
753 | return r; | |
754 | } | |
755 | ||
b77e38aa SR |
756 | static const struct seq_operations show_event_seq_ops = { |
757 | .start = t_start, | |
758 | .next = t_next, | |
759 | .show = t_show, | |
760 | .stop = t_stop, | |
761 | }; | |
762 | ||
763 | static const struct seq_operations show_set_event_seq_ops = { | |
764 | .start = s_start, | |
765 | .next = s_next, | |
766 | .show = t_show, | |
767 | .stop = t_stop, | |
768 | }; | |
769 | ||
2314c4ae SR |
770 | static const struct file_operations ftrace_avail_fops = { |
771 | .open = ftrace_event_seq_open, | |
772 | .read = seq_read, | |
773 | .llseek = seq_lseek, | |
774 | .release = seq_release, | |
775 | }; | |
776 | ||
b77e38aa SR |
777 | static const struct file_operations ftrace_set_event_fops = { |
778 | .open = ftrace_event_seq_open, | |
779 | .read = seq_read, | |
780 | .write = ftrace_event_write, | |
781 | .llseek = seq_lseek, | |
782 | .release = seq_release, | |
783 | }; | |
784 | ||
1473e441 SR |
785 | static const struct file_operations ftrace_enable_fops = { |
786 | .open = tracing_open_generic, | |
787 | .read = event_enable_read, | |
788 | .write = event_enable_write, | |
789 | }; | |
790 | ||
981d081e SR |
791 | static const struct file_operations ftrace_event_format_fops = { |
792 | .open = tracing_open_generic, | |
793 | .read = event_format_read, | |
794 | }; | |
795 | ||
23725aee PZ |
796 | static const struct file_operations ftrace_event_id_fops = { |
797 | .open = tracing_open_generic, | |
798 | .read = event_id_read, | |
799 | }; | |
800 | ||
7ce7e424 TZ |
801 | static const struct file_operations ftrace_event_filter_fops = { |
802 | .open = tracing_open_generic, | |
803 | .read = event_filter_read, | |
804 | .write = event_filter_write, | |
805 | }; | |
806 | ||
cfb180f3 TZ |
807 | static const struct file_operations ftrace_subsystem_filter_fops = { |
808 | .open = tracing_open_generic, | |
809 | .read = subsystem_filter_read, | |
810 | .write = subsystem_filter_write, | |
811 | }; | |
812 | ||
8ae79a13 SR |
813 | static const struct file_operations ftrace_system_enable_fops = { |
814 | .open = tracing_open_generic, | |
815 | .read = system_enable_read, | |
816 | .write = system_enable_write, | |
817 | }; | |
818 | ||
d1b182a8 SR |
819 | static const struct file_operations ftrace_show_header_fops = { |
820 | .open = tracing_open_generic, | |
821 | .read = show_header, | |
822 | }; | |
823 | ||
1473e441 SR |
824 | static struct dentry *event_trace_events_dir(void) |
825 | { | |
826 | static struct dentry *d_tracer; | |
827 | static struct dentry *d_events; | |
828 | ||
829 | if (d_events) | |
830 | return d_events; | |
831 | ||
832 | d_tracer = tracing_init_dentry(); | |
833 | if (!d_tracer) | |
834 | return NULL; | |
835 | ||
836 | d_events = debugfs_create_dir("events", d_tracer); | |
837 | if (!d_events) | |
838 | pr_warning("Could not create debugfs " | |
839 | "'events' directory\n"); | |
840 | ||
841 | return d_events; | |
842 | } | |
843 | ||
6ecc2d1c SR |
844 | static LIST_HEAD(event_subsystems); |
845 | ||
846 | static struct dentry * | |
847 | event_subsystem_dir(const char *name, struct dentry *d_events) | |
848 | { | |
849 | struct event_subsystem *system; | |
e1112b4d | 850 | struct dentry *entry; |
6ecc2d1c SR |
851 | |
852 | /* First see if we did not already create this dir */ | |
853 | list_for_each_entry(system, &event_subsystems, list) { | |
dc82ec98 XG |
854 | if (strcmp(system->name, name) == 0) { |
855 | system->nr_events++; | |
6ecc2d1c | 856 | return system->entry; |
dc82ec98 | 857 | } |
6ecc2d1c SR |
858 | } |
859 | ||
860 | /* need to create new entry */ | |
861 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
862 | if (!system) { | |
863 | pr_warning("No memory to create event subsystem %s\n", | |
864 | name); | |
865 | return d_events; | |
866 | } | |
867 | ||
868 | system->entry = debugfs_create_dir(name, d_events); | |
869 | if (!system->entry) { | |
870 | pr_warning("Could not create event subsystem %s\n", | |
871 | name); | |
872 | kfree(system); | |
873 | return d_events; | |
874 | } | |
875 | ||
dc82ec98 | 876 | system->nr_events = 1; |
6d723736 SR |
877 | system->name = kstrdup(name, GFP_KERNEL); |
878 | if (!system->name) { | |
879 | debugfs_remove(system->entry); | |
880 | kfree(system); | |
881 | return d_events; | |
882 | } | |
883 | ||
6ecc2d1c SR |
884 | list_add(&system->list, &event_subsystems); |
885 | ||
30e673b2 | 886 | system->filter = NULL; |
cfb180f3 | 887 | |
8b372562 TZ |
888 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
889 | if (!system->filter) { | |
890 | pr_warning("Could not allocate filter for subsystem " | |
891 | "'%s'\n", name); | |
892 | return system->entry; | |
893 | } | |
894 | ||
e1112b4d TZ |
895 | entry = debugfs_create_file("filter", 0644, system->entry, system, |
896 | &ftrace_subsystem_filter_fops); | |
8b372562 TZ |
897 | if (!entry) { |
898 | kfree(system->filter); | |
899 | system->filter = NULL; | |
e1112b4d TZ |
900 | pr_warning("Could not create debugfs " |
901 | "'%s/filter' entry\n", name); | |
8b372562 | 902 | } |
e1112b4d | 903 | |
8ae79a13 SR |
904 | entry = trace_create_file("enable", 0644, system->entry, |
905 | (void *)system->name, | |
906 | &ftrace_system_enable_fops); | |
907 | ||
6ecc2d1c SR |
908 | return system->entry; |
909 | } | |
910 | ||
1473e441 | 911 | static int |
701970b3 SR |
912 | event_create_dir(struct ftrace_event_call *call, struct dentry *d_events, |
913 | const struct file_operations *id, | |
914 | const struct file_operations *enable, | |
915 | const struct file_operations *filter, | |
916 | const struct file_operations *format) | |
1473e441 SR |
917 | { |
918 | struct dentry *entry; | |
fd994989 | 919 | int ret; |
1473e441 | 920 | |
6ecc2d1c SR |
921 | /* |
922 | * If the trace point header did not define TRACE_SYSTEM | |
923 | * then the system would be called "TRACE_SYSTEM". | |
924 | */ | |
6d723736 | 925 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
6ecc2d1c SR |
926 | d_events = event_subsystem_dir(call->system, d_events); |
927 | ||
fd994989 SR |
928 | if (call->raw_init) { |
929 | ret = call->raw_init(); | |
930 | if (ret < 0) { | |
931 | pr_warning("Could not initialize trace point" | |
932 | " events/%s\n", call->name); | |
933 | return ret; | |
934 | } | |
935 | } | |
936 | ||
1473e441 SR |
937 | call->dir = debugfs_create_dir(call->name, d_events); |
938 | if (!call->dir) { | |
939 | pr_warning("Could not create debugfs " | |
940 | "'%s' directory\n", call->name); | |
941 | return -1; | |
942 | } | |
943 | ||
6d723736 SR |
944 | if (call->regfunc) |
945 | entry = trace_create_file("enable", 0644, call->dir, call, | |
701970b3 | 946 | enable); |
1473e441 | 947 | |
af6af30c | 948 | if (call->id && call->profile_enable) |
6d723736 | 949 | entry = trace_create_file("id", 0444, call->dir, call, |
701970b3 | 950 | id); |
23725aee | 951 | |
cf027f64 TZ |
952 | if (call->define_fields) { |
953 | ret = call->define_fields(); | |
954 | if (ret < 0) { | |
955 | pr_warning("Could not initialize trace point" | |
956 | " events/%s\n", call->name); | |
957 | return ret; | |
958 | } | |
6d723736 | 959 | entry = trace_create_file("filter", 0644, call->dir, call, |
701970b3 | 960 | filter); |
cf027f64 TZ |
961 | } |
962 | ||
981d081e SR |
963 | /* A trace may not want to export its format */ |
964 | if (!call->show_format) | |
965 | return 0; | |
966 | ||
6d723736 | 967 | entry = trace_create_file("format", 0444, call->dir, call, |
701970b3 | 968 | format); |
6d723736 SR |
969 | |
970 | return 0; | |
971 | } | |
972 | ||
973 | #define for_each_event(event, start, end) \ | |
974 | for (event = start; \ | |
975 | (unsigned long)event < (unsigned long)end; \ | |
976 | event++) | |
977 | ||
61f919a1 | 978 | #ifdef CONFIG_MODULES |
701970b3 SR |
979 | |
980 | static LIST_HEAD(ftrace_module_file_list); | |
981 | ||
982 | /* | |
983 | * Modules must own their file_operations to keep up with | |
984 | * reference counting. | |
985 | */ | |
986 | struct ftrace_module_file_ops { | |
987 | struct list_head list; | |
988 | struct module *mod; | |
989 | struct file_operations id; | |
990 | struct file_operations enable; | |
991 | struct file_operations format; | |
992 | struct file_operations filter; | |
993 | }; | |
994 | ||
a2ca5e03 FW |
995 | static void remove_subsystem_dir(const char *name) |
996 | { | |
997 | struct event_subsystem *system; | |
998 | ||
999 | if (strcmp(name, TRACE_SYSTEM) == 0) | |
1000 | return; | |
1001 | ||
1002 | list_for_each_entry(system, &event_subsystems, list) { | |
1003 | if (strcmp(system->name, name) == 0) { | |
1004 | if (!--system->nr_events) { | |
1005 | struct event_filter *filter = system->filter; | |
1006 | ||
1007 | debugfs_remove_recursive(system->entry); | |
1008 | list_del(&system->list); | |
1009 | if (filter) { | |
1010 | kfree(filter->filter_string); | |
1011 | kfree(filter); | |
1012 | } | |
1013 | kfree(system->name); | |
1014 | kfree(system); | |
1015 | } | |
1016 | break; | |
1017 | } | |
1018 | } | |
1019 | } | |
1020 | ||
701970b3 SR |
1021 | static struct ftrace_module_file_ops * |
1022 | trace_create_file_ops(struct module *mod) | |
1023 | { | |
1024 | struct ftrace_module_file_ops *file_ops; | |
1025 | ||
1026 | /* | |
1027 | * This is a bit of a PITA. To allow for correct reference | |
1028 | * counting, modules must "own" their file_operations. | |
1029 | * To do this, we allocate the file operations that will be | |
1030 | * used in the event directory. | |
1031 | */ | |
1032 | ||
1033 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1034 | if (!file_ops) | |
1035 | return NULL; | |
1036 | ||
1037 | file_ops->mod = mod; | |
1038 | ||
1039 | file_ops->id = ftrace_event_id_fops; | |
1040 | file_ops->id.owner = mod; | |
1041 | ||
1042 | file_ops->enable = ftrace_enable_fops; | |
1043 | file_ops->enable.owner = mod; | |
1044 | ||
1045 | file_ops->filter = ftrace_event_filter_fops; | |
1046 | file_ops->filter.owner = mod; | |
1047 | ||
1048 | file_ops->format = ftrace_event_format_fops; | |
1049 | file_ops->format.owner = mod; | |
1050 | ||
1051 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1052 | ||
1053 | return file_ops; | |
1054 | } | |
1055 | ||
6d723736 SR |
1056 | static void trace_module_add_events(struct module *mod) |
1057 | { | |
701970b3 | 1058 | struct ftrace_module_file_ops *file_ops = NULL; |
6d723736 SR |
1059 | struct ftrace_event_call *call, *start, *end; |
1060 | struct dentry *d_events; | |
1061 | ||
1062 | start = mod->trace_events; | |
1063 | end = mod->trace_events + mod->num_trace_events; | |
1064 | ||
1065 | if (start == end) | |
1066 | return; | |
1067 | ||
1068 | d_events = event_trace_events_dir(); | |
1069 | if (!d_events) | |
1070 | return; | |
1071 | ||
1072 | for_each_event(call, start, end) { | |
1073 | /* The linker may leave blanks */ | |
1074 | if (!call->name) | |
1075 | continue; | |
701970b3 SR |
1076 | |
1077 | /* | |
1078 | * This module has events, create file ops for this module | |
1079 | * if not already done. | |
1080 | */ | |
1081 | if (!file_ops) { | |
1082 | file_ops = trace_create_file_ops(mod); | |
1083 | if (!file_ops) | |
1084 | return; | |
1085 | } | |
6d723736 SR |
1086 | call->mod = mod; |
1087 | list_add(&call->list, &ftrace_events); | |
701970b3 SR |
1088 | event_create_dir(call, d_events, |
1089 | &file_ops->id, &file_ops->enable, | |
1090 | &file_ops->filter, &file_ops->format); | |
6d723736 SR |
1091 | } |
1092 | } | |
1093 | ||
1094 | static void trace_module_remove_events(struct module *mod) | |
1095 | { | |
701970b3 | 1096 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1097 | struct ftrace_event_call *call, *p; |
9456f0fa | 1098 | bool found = false; |
6d723736 | 1099 | |
110bf2b7 | 1100 | down_write(&trace_event_mutex); |
6d723736 SR |
1101 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1102 | if (call->mod == mod) { | |
9456f0fa | 1103 | found = true; |
0e907c99 | 1104 | ftrace_event_enable_disable(call, 0); |
6d723736 | 1105 | if (call->event) |
110bf2b7 | 1106 | __unregister_ftrace_event(call->event); |
6d723736 SR |
1107 | debugfs_remove_recursive(call->dir); |
1108 | list_del(&call->list); | |
2df75e41 LZ |
1109 | trace_destroy_fields(call); |
1110 | destroy_preds(call); | |
dc82ec98 | 1111 | remove_subsystem_dir(call->system); |
6d723736 SR |
1112 | } |
1113 | } | |
701970b3 SR |
1114 | |
1115 | /* Now free the file_operations */ | |
1116 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1117 | if (file_ops->mod == mod) | |
1118 | break; | |
1119 | } | |
1120 | if (&file_ops->list != &ftrace_module_file_list) { | |
1121 | list_del(&file_ops->list); | |
1122 | kfree(file_ops); | |
1123 | } | |
9456f0fa SR |
1124 | |
1125 | /* | |
1126 | * It is safest to reset the ring buffer if the module being unloaded | |
1127 | * registered any events. | |
1128 | */ | |
1129 | if (found) | |
1130 | tracing_reset_current_online_cpus(); | |
110bf2b7 | 1131 | up_write(&trace_event_mutex); |
6d723736 SR |
1132 | } |
1133 | ||
61f919a1 SR |
1134 | static int trace_module_notify(struct notifier_block *self, |
1135 | unsigned long val, void *data) | |
6d723736 SR |
1136 | { |
1137 | struct module *mod = data; | |
1138 | ||
1139 | mutex_lock(&event_mutex); | |
1140 | switch (val) { | |
1141 | case MODULE_STATE_COMING: | |
1142 | trace_module_add_events(mod); | |
1143 | break; | |
1144 | case MODULE_STATE_GOING: | |
1145 | trace_module_remove_events(mod); | |
1146 | break; | |
1147 | } | |
1148 | mutex_unlock(&event_mutex); | |
fd994989 | 1149 | |
1473e441 SR |
1150 | return 0; |
1151 | } | |
61f919a1 SR |
1152 | #else |
1153 | static int trace_module_notify(struct notifier_block *self, | |
1154 | unsigned long val, void *data) | |
1155 | { | |
1156 | return 0; | |
1157 | } | |
1158 | #endif /* CONFIG_MODULES */ | |
1473e441 | 1159 | |
6d723736 SR |
1160 | struct notifier_block trace_module_nb = { |
1161 | .notifier_call = trace_module_notify, | |
1162 | .priority = 0, | |
1163 | }; | |
1164 | ||
a59fd602 SR |
1165 | extern struct ftrace_event_call __start_ftrace_events[]; |
1166 | extern struct ftrace_event_call __stop_ftrace_events[]; | |
1167 | ||
020e5f85 LZ |
1168 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
1169 | ||
1170 | static __init int setup_trace_event(char *str) | |
1171 | { | |
1172 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
1173 | ring_buffer_expanded = 1; | |
1174 | tracing_selftest_disabled = 1; | |
1175 | ||
1176 | return 1; | |
1177 | } | |
1178 | __setup("trace_event=", setup_trace_event); | |
1179 | ||
b77e38aa SR |
1180 | static __init int event_trace_init(void) |
1181 | { | |
a59fd602 | 1182 | struct ftrace_event_call *call; |
b77e38aa SR |
1183 | struct dentry *d_tracer; |
1184 | struct dentry *entry; | |
1473e441 | 1185 | struct dentry *d_events; |
6d723736 | 1186 | int ret; |
020e5f85 LZ |
1187 | char *buf = bootup_event_buf; |
1188 | char *token; | |
b77e38aa SR |
1189 | |
1190 | d_tracer = tracing_init_dentry(); | |
1191 | if (!d_tracer) | |
1192 | return 0; | |
1193 | ||
2314c4ae SR |
1194 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
1195 | (void *)&show_event_seq_ops, | |
1196 | &ftrace_avail_fops); | |
1197 | if (!entry) | |
1198 | pr_warning("Could not create debugfs " | |
1199 | "'available_events' entry\n"); | |
1200 | ||
b77e38aa SR |
1201 | entry = debugfs_create_file("set_event", 0644, d_tracer, |
1202 | (void *)&show_set_event_seq_ops, | |
1203 | &ftrace_set_event_fops); | |
1204 | if (!entry) | |
1205 | pr_warning("Could not create debugfs " | |
1206 | "'set_event' entry\n"); | |
1207 | ||
1473e441 SR |
1208 | d_events = event_trace_events_dir(); |
1209 | if (!d_events) | |
1210 | return 0; | |
1211 | ||
d1b182a8 SR |
1212 | /* ring buffer internal formats */ |
1213 | trace_create_file("header_page", 0444, d_events, | |
1214 | ring_buffer_print_page_header, | |
1215 | &ftrace_show_header_fops); | |
1216 | ||
1217 | trace_create_file("header_event", 0444, d_events, | |
1218 | ring_buffer_print_entry_header, | |
1219 | &ftrace_show_header_fops); | |
1220 | ||
8ae79a13 | 1221 | trace_create_file("enable", 0644, d_events, |
8f31bfe5 | 1222 | NULL, &ftrace_system_enable_fops); |
8ae79a13 | 1223 | |
6d723736 | 1224 | for_each_event(call, __start_ftrace_events, __stop_ftrace_events) { |
1473e441 SR |
1225 | /* The linker may leave blanks */ |
1226 | if (!call->name) | |
1227 | continue; | |
a59fd602 | 1228 | list_add(&call->list, &ftrace_events); |
701970b3 SR |
1229 | event_create_dir(call, d_events, &ftrace_event_id_fops, |
1230 | &ftrace_enable_fops, &ftrace_event_filter_fops, | |
1231 | &ftrace_event_format_fops); | |
1473e441 SR |
1232 | } |
1233 | ||
020e5f85 LZ |
1234 | while (true) { |
1235 | token = strsep(&buf, ","); | |
1236 | ||
1237 | if (!token) | |
1238 | break; | |
1239 | if (!*token) | |
1240 | continue; | |
1241 | ||
1242 | ret = ftrace_set_clr_event(token, 1); | |
1243 | if (ret) | |
1244 | pr_warning("Failed to enable trace event: %s\n", token); | |
1245 | } | |
1246 | ||
6d723736 | 1247 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 1248 | if (ret) |
6d723736 SR |
1249 | pr_warning("Failed to register trace events module notifier\n"); |
1250 | ||
b77e38aa SR |
1251 | return 0; |
1252 | } | |
1253 | fs_initcall(event_trace_init); | |
e6187007 SR |
1254 | |
1255 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1256 | ||
1257 | static DEFINE_SPINLOCK(test_spinlock); | |
1258 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
1259 | static DEFINE_MUTEX(test_mutex); | |
1260 | ||
1261 | static __init void test_work(struct work_struct *dummy) | |
1262 | { | |
1263 | spin_lock(&test_spinlock); | |
1264 | spin_lock_irq(&test_spinlock_irq); | |
1265 | udelay(1); | |
1266 | spin_unlock_irq(&test_spinlock_irq); | |
1267 | spin_unlock(&test_spinlock); | |
1268 | ||
1269 | mutex_lock(&test_mutex); | |
1270 | msleep(1); | |
1271 | mutex_unlock(&test_mutex); | |
1272 | } | |
1273 | ||
1274 | static __init int event_test_thread(void *unused) | |
1275 | { | |
1276 | void *test_malloc; | |
1277 | ||
1278 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
1279 | if (!test_malloc) | |
1280 | pr_info("failed to kmalloc\n"); | |
1281 | ||
1282 | schedule_on_each_cpu(test_work); | |
1283 | ||
1284 | kfree(test_malloc); | |
1285 | ||
1286 | set_current_state(TASK_INTERRUPTIBLE); | |
1287 | while (!kthread_should_stop()) | |
1288 | schedule(); | |
1289 | ||
1290 | return 0; | |
1291 | } | |
1292 | ||
1293 | /* | |
1294 | * Do various things that may trigger events. | |
1295 | */ | |
1296 | static __init void event_test_stuff(void) | |
1297 | { | |
1298 | struct task_struct *test_thread; | |
1299 | ||
1300 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
1301 | msleep(1); | |
1302 | kthread_stop(test_thread); | |
1303 | } | |
1304 | ||
1305 | /* | |
1306 | * For every trace event defined, we will test each trace point separately, | |
1307 | * and then by groups, and finally all trace points. | |
1308 | */ | |
9ea21c1e | 1309 | static __init void event_trace_self_tests(void) |
e6187007 SR |
1310 | { |
1311 | struct ftrace_event_call *call; | |
1312 | struct event_subsystem *system; | |
e6187007 SR |
1313 | int ret; |
1314 | ||
1315 | pr_info("Running tests on trace events:\n"); | |
1316 | ||
1317 | list_for_each_entry(call, &ftrace_events, list) { | |
1318 | ||
1319 | /* Only test those that have a regfunc */ | |
1320 | if (!call->regfunc) | |
1321 | continue; | |
1322 | ||
1323 | pr_info("Testing event %s: ", call->name); | |
1324 | ||
1325 | /* | |
1326 | * If an event is already enabled, someone is using | |
1327 | * it and the self test should not be on. | |
1328 | */ | |
1329 | if (call->enabled) { | |
1330 | pr_warning("Enabled event during self test!\n"); | |
1331 | WARN_ON_ONCE(1); | |
1332 | continue; | |
1333 | } | |
1334 | ||
0e907c99 | 1335 | ftrace_event_enable_disable(call, 1); |
e6187007 | 1336 | event_test_stuff(); |
0e907c99 | 1337 | ftrace_event_enable_disable(call, 0); |
e6187007 SR |
1338 | |
1339 | pr_cont("OK\n"); | |
1340 | } | |
1341 | ||
1342 | /* Now test at the sub system level */ | |
1343 | ||
1344 | pr_info("Running tests on trace event systems:\n"); | |
1345 | ||
1346 | list_for_each_entry(system, &event_subsystems, list) { | |
1347 | ||
1348 | /* the ftrace system is special, skip it */ | |
1349 | if (strcmp(system->name, "ftrace") == 0) | |
1350 | continue; | |
1351 | ||
1352 | pr_info("Testing event system %s: ", system->name); | |
1353 | ||
8f31bfe5 | 1354 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1); |
e6187007 SR |
1355 | if (WARN_ON_ONCE(ret)) { |
1356 | pr_warning("error enabling system %s\n", | |
1357 | system->name); | |
1358 | continue; | |
1359 | } | |
1360 | ||
1361 | event_test_stuff(); | |
1362 | ||
8f31bfe5 | 1363 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0); |
e6187007 SR |
1364 | if (WARN_ON_ONCE(ret)) |
1365 | pr_warning("error disabling system %s\n", | |
1366 | system->name); | |
1367 | ||
1368 | pr_cont("OK\n"); | |
1369 | } | |
1370 | ||
1371 | /* Test with all events enabled */ | |
1372 | ||
1373 | pr_info("Running tests on all trace events:\n"); | |
1374 | pr_info("Testing all events: "); | |
1375 | ||
8f31bfe5 | 1376 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1); |
e6187007 | 1377 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 1378 | pr_warning("error enabling all events\n"); |
9ea21c1e | 1379 | return; |
e6187007 SR |
1380 | } |
1381 | ||
1382 | event_test_stuff(); | |
1383 | ||
1384 | /* reset sysname */ | |
8f31bfe5 | 1385 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0); |
e6187007 SR |
1386 | if (WARN_ON_ONCE(ret)) { |
1387 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 1388 | return; |
e6187007 SR |
1389 | } |
1390 | ||
1391 | pr_cont("OK\n"); | |
9ea21c1e SR |
1392 | } |
1393 | ||
1394 | #ifdef CONFIG_FUNCTION_TRACER | |
1395 | ||
1396 | static DEFINE_PER_CPU(atomic_t, test_event_disable); | |
1397 | ||
1398 | static void | |
1399 | function_test_events_call(unsigned long ip, unsigned long parent_ip) | |
1400 | { | |
1401 | struct ring_buffer_event *event; | |
1402 | struct ftrace_entry *entry; | |
1403 | unsigned long flags; | |
1404 | long disabled; | |
1405 | int resched; | |
1406 | int cpu; | |
1407 | int pc; | |
1408 | ||
1409 | pc = preempt_count(); | |
1410 | resched = ftrace_preempt_disable(); | |
1411 | cpu = raw_smp_processor_id(); | |
1412 | disabled = atomic_inc_return(&per_cpu(test_event_disable, cpu)); | |
1413 | ||
1414 | if (disabled != 1) | |
1415 | goto out; | |
1416 | ||
1417 | local_save_flags(flags); | |
1418 | ||
1419 | event = trace_current_buffer_lock_reserve(TRACE_FN, sizeof(*entry), | |
1420 | flags, pc); | |
1421 | if (!event) | |
1422 | goto out; | |
1423 | entry = ring_buffer_event_data(event); | |
1424 | entry->ip = ip; | |
1425 | entry->parent_ip = parent_ip; | |
1426 | ||
cb4764a6 | 1427 | trace_nowake_buffer_unlock_commit(event, flags, pc); |
9ea21c1e SR |
1428 | |
1429 | out: | |
1430 | atomic_dec(&per_cpu(test_event_disable, cpu)); | |
1431 | ftrace_preempt_enable(resched); | |
1432 | } | |
1433 | ||
1434 | static struct ftrace_ops trace_ops __initdata = | |
1435 | { | |
1436 | .func = function_test_events_call, | |
1437 | }; | |
1438 | ||
1439 | static __init void event_trace_self_test_with_function(void) | |
1440 | { | |
1441 | register_ftrace_function(&trace_ops); | |
1442 | pr_info("Running tests again, along with the function tracer\n"); | |
1443 | event_trace_self_tests(); | |
1444 | unregister_ftrace_function(&trace_ops); | |
1445 | } | |
1446 | #else | |
1447 | static __init void event_trace_self_test_with_function(void) | |
1448 | { | |
1449 | } | |
1450 | #endif | |
1451 | ||
1452 | static __init int event_trace_self_tests_init(void) | |
1453 | { | |
020e5f85 LZ |
1454 | if (!tracing_selftest_disabled) { |
1455 | event_trace_self_tests(); | |
1456 | event_trace_self_test_with_function(); | |
1457 | } | |
e6187007 SR |
1458 | |
1459 | return 0; | |
1460 | } | |
1461 | ||
28d20e2d | 1462 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
1463 | |
1464 | #endif |