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 | ||
11 | #include <linux/debugfs.h> | |
12 | #include <linux/uaccess.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/ctype.h> | |
15 | ||
91729ef9 | 16 | #include "trace_output.h" |
b77e38aa | 17 | |
b628b3e6 SR |
18 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
19 | ||
11a241a3 SR |
20 | static DEFINE_MUTEX(event_mutex); |
21 | ||
1473e441 SR |
22 | #define events_for_each(event) \ |
23 | for (event = __start_ftrace_events; \ | |
24 | (unsigned long)event < (unsigned long)__stop_ftrace_events; \ | |
25 | event++) | |
26 | ||
b77e38aa SR |
27 | void event_trace_printk(unsigned long ip, const char *fmt, ...) |
28 | { | |
29 | va_list ap; | |
30 | ||
31 | va_start(ap, fmt); | |
32 | tracing_record_cmdline(current); | |
33 | trace_vprintk(ip, task_curr_ret_stack(current), fmt, ap); | |
34 | va_end(ap); | |
35 | } | |
36 | ||
37 | static void ftrace_clear_events(void) | |
38 | { | |
39 | struct ftrace_event_call *call = (void *)__start_ftrace_events; | |
40 | ||
41 | ||
42 | while ((unsigned long)call < (unsigned long)__stop_ftrace_events) { | |
43 | ||
44 | if (call->enabled) { | |
45 | call->enabled = 0; | |
46 | call->unregfunc(); | |
47 | } | |
48 | call++; | |
49 | } | |
50 | } | |
51 | ||
fd994989 SR |
52 | static void ftrace_event_enable_disable(struct ftrace_event_call *call, |
53 | int enable) | |
54 | { | |
55 | ||
56 | switch (enable) { | |
57 | case 0: | |
58 | if (call->enabled) { | |
59 | call->enabled = 0; | |
60 | call->unregfunc(); | |
61 | } | |
62 | if (call->raw_enabled) { | |
63 | call->raw_enabled = 0; | |
64 | call->raw_unreg(); | |
65 | } | |
66 | break; | |
67 | case 1: | |
68 | if (!call->enabled && | |
69 | (call->type & TRACE_EVENT_TYPE_PRINTF)) { | |
70 | call->enabled = 1; | |
71 | call->regfunc(); | |
72 | } | |
73 | if (!call->raw_enabled && | |
74 | (call->type & TRACE_EVENT_TYPE_RAW)) { | |
75 | call->raw_enabled = 1; | |
76 | call->raw_reg(); | |
77 | } | |
78 | break; | |
79 | } | |
80 | } | |
81 | ||
b77e38aa SR |
82 | static int ftrace_set_clr_event(char *buf, int set) |
83 | { | |
1473e441 | 84 | struct ftrace_event_call *call = __start_ftrace_events; |
b628b3e6 SR |
85 | char *event = NULL, *sub = NULL, *match; |
86 | int ret = -EINVAL; | |
87 | ||
88 | /* | |
89 | * The buf format can be <subsystem>:<event-name> | |
90 | * *:<event-name> means any event by that name. | |
91 | * :<event-name> is the same. | |
92 | * | |
93 | * <subsystem>:* means all events in that subsystem | |
94 | * <subsystem>: means the same. | |
95 | * | |
96 | * <name> (no ':') means all events in a subsystem with | |
97 | * the name <name> or any event that matches <name> | |
98 | */ | |
99 | ||
100 | match = strsep(&buf, ":"); | |
101 | if (buf) { | |
102 | sub = match; | |
103 | event = buf; | |
104 | match = NULL; | |
105 | ||
106 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
107 | sub = NULL; | |
108 | if (!strlen(event) || strcmp(event, "*") == 0) | |
109 | event = NULL; | |
110 | } | |
b77e38aa | 111 | |
11a241a3 | 112 | mutex_lock(&event_mutex); |
1473e441 | 113 | events_for_each(call) { |
b77e38aa | 114 | |
1473e441 SR |
115 | if (!call->name) |
116 | continue; | |
117 | ||
b628b3e6 SR |
118 | if (match && |
119 | strcmp(match, call->name) != 0 && | |
120 | strcmp(match, call->system) != 0) | |
121 | continue; | |
122 | ||
123 | if (sub && strcmp(sub, call->system) != 0) | |
124 | continue; | |
125 | ||
126 | if (event && strcmp(event, call->name) != 0) | |
b77e38aa | 127 | continue; |
b77e38aa | 128 | |
fd994989 SR |
129 | ftrace_event_enable_disable(call, set); |
130 | ||
b628b3e6 | 131 | ret = 0; |
b77e38aa | 132 | } |
11a241a3 SR |
133 | mutex_unlock(&event_mutex); |
134 | ||
b628b3e6 | 135 | return ret; |
b77e38aa SR |
136 | } |
137 | ||
138 | /* 128 should be much more than enough */ | |
139 | #define EVENT_BUF_SIZE 127 | |
140 | ||
141 | static ssize_t | |
142 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
143 | size_t cnt, loff_t *ppos) | |
144 | { | |
145 | size_t read = 0; | |
146 | int i, set = 1; | |
147 | ssize_t ret; | |
148 | char *buf; | |
149 | char ch; | |
150 | ||
151 | if (!cnt || cnt < 0) | |
152 | return 0; | |
153 | ||
154 | ret = get_user(ch, ubuf++); | |
155 | if (ret) | |
156 | return ret; | |
157 | read++; | |
158 | cnt--; | |
159 | ||
160 | /* skip white space */ | |
161 | while (cnt && isspace(ch)) { | |
162 | ret = get_user(ch, ubuf++); | |
163 | if (ret) | |
164 | return ret; | |
165 | read++; | |
166 | cnt--; | |
167 | } | |
168 | ||
169 | /* Only white space found? */ | |
170 | if (isspace(ch)) { | |
171 | file->f_pos += read; | |
172 | ret = read; | |
173 | return ret; | |
174 | } | |
175 | ||
176 | buf = kmalloc(EVENT_BUF_SIZE+1, GFP_KERNEL); | |
177 | if (!buf) | |
178 | return -ENOMEM; | |
179 | ||
180 | if (cnt > EVENT_BUF_SIZE) | |
181 | cnt = EVENT_BUF_SIZE; | |
182 | ||
183 | i = 0; | |
184 | while (cnt && !isspace(ch)) { | |
185 | if (!i && ch == '!') | |
186 | set = 0; | |
187 | else | |
188 | buf[i++] = ch; | |
189 | ||
190 | ret = get_user(ch, ubuf++); | |
191 | if (ret) | |
192 | goto out_free; | |
193 | read++; | |
194 | cnt--; | |
195 | } | |
196 | buf[i] = 0; | |
197 | ||
198 | file->f_pos += read; | |
199 | ||
200 | ret = ftrace_set_clr_event(buf, set); | |
201 | if (ret) | |
202 | goto out_free; | |
203 | ||
204 | ret = read; | |
205 | ||
206 | out_free: | |
207 | kfree(buf); | |
208 | ||
209 | return ret; | |
210 | } | |
211 | ||
212 | static void * | |
213 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
214 | { | |
215 | struct ftrace_event_call *call = m->private; | |
216 | struct ftrace_event_call *next = call; | |
217 | ||
218 | (*pos)++; | |
219 | ||
220 | if ((unsigned long)call >= (unsigned long)__stop_ftrace_events) | |
221 | return NULL; | |
222 | ||
223 | m->private = ++next; | |
224 | ||
225 | return call; | |
226 | } | |
227 | ||
228 | static void *t_start(struct seq_file *m, loff_t *pos) | |
229 | { | |
230 | return t_next(m, NULL, pos); | |
231 | } | |
232 | ||
233 | static void * | |
234 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
235 | { | |
236 | struct ftrace_event_call *call = m->private; | |
237 | struct ftrace_event_call *next; | |
238 | ||
239 | (*pos)++; | |
240 | ||
241 | retry: | |
242 | if ((unsigned long)call >= (unsigned long)__stop_ftrace_events) | |
243 | return NULL; | |
244 | ||
245 | if (!call->enabled) { | |
246 | call++; | |
247 | goto retry; | |
248 | } | |
249 | ||
250 | next = call; | |
251 | m->private = ++next; | |
252 | ||
253 | return call; | |
254 | } | |
255 | ||
256 | static void *s_start(struct seq_file *m, loff_t *pos) | |
257 | { | |
258 | return s_next(m, NULL, pos); | |
259 | } | |
260 | ||
261 | static int t_show(struct seq_file *m, void *v) | |
262 | { | |
263 | struct ftrace_event_call *call = v; | |
264 | ||
b628b3e6 SR |
265 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
266 | seq_printf(m, "%s:", call->system); | |
b77e38aa SR |
267 | seq_printf(m, "%s\n", call->name); |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
272 | static void t_stop(struct seq_file *m, void *p) | |
273 | { | |
274 | } | |
275 | ||
276 | static int | |
277 | ftrace_event_seq_open(struct inode *inode, struct file *file) | |
278 | { | |
279 | int ret; | |
280 | const struct seq_operations *seq_ops; | |
281 | ||
282 | if ((file->f_mode & FMODE_WRITE) && | |
283 | !(file->f_flags & O_APPEND)) | |
284 | ftrace_clear_events(); | |
285 | ||
286 | seq_ops = inode->i_private; | |
287 | ret = seq_open(file, seq_ops); | |
288 | if (!ret) { | |
289 | struct seq_file *m = file->private_data; | |
290 | ||
291 | m->private = __start_ftrace_events; | |
292 | } | |
293 | return ret; | |
294 | } | |
295 | ||
1473e441 SR |
296 | static ssize_t |
297 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
298 | loff_t *ppos) | |
299 | { | |
300 | struct ftrace_event_call *call = filp->private_data; | |
301 | char *buf; | |
302 | ||
fd994989 | 303 | if (call->enabled || call->raw_enabled) |
1473e441 SR |
304 | buf = "1\n"; |
305 | else | |
306 | buf = "0\n"; | |
307 | ||
308 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
309 | } | |
310 | ||
311 | static ssize_t | |
312 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
313 | loff_t *ppos) | |
314 | { | |
315 | struct ftrace_event_call *call = filp->private_data; | |
316 | char buf[64]; | |
317 | unsigned long val; | |
318 | int ret; | |
319 | ||
320 | if (cnt >= sizeof(buf)) | |
321 | return -EINVAL; | |
322 | ||
323 | if (copy_from_user(&buf, ubuf, cnt)) | |
324 | return -EFAULT; | |
325 | ||
326 | buf[cnt] = 0; | |
327 | ||
328 | ret = strict_strtoul(buf, 10, &val); | |
329 | if (ret < 0) | |
330 | return ret; | |
331 | ||
332 | switch (val) { | |
333 | case 0: | |
1473e441 | 334 | case 1: |
11a241a3 | 335 | mutex_lock(&event_mutex); |
fd994989 | 336 | ftrace_event_enable_disable(call, val); |
11a241a3 | 337 | mutex_unlock(&event_mutex); |
1473e441 SR |
338 | break; |
339 | ||
340 | default: | |
341 | return -EINVAL; | |
342 | } | |
343 | ||
344 | *ppos += cnt; | |
345 | ||
346 | return cnt; | |
347 | } | |
348 | ||
fd994989 SR |
349 | static ssize_t |
350 | event_type_read(struct file *filp, char __user *ubuf, size_t cnt, | |
351 | loff_t *ppos) | |
352 | { | |
353 | struct ftrace_event_call *call = filp->private_data; | |
354 | char buf[16]; | |
355 | int r = 0; | |
356 | ||
357 | if (call->type & TRACE_EVENT_TYPE_PRINTF) | |
358 | r += sprintf(buf, "printf\n"); | |
359 | ||
360 | if (call->type & TRACE_EVENT_TYPE_RAW) | |
361 | r += sprintf(buf+r, "raw\n"); | |
362 | ||
363 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
364 | } | |
365 | ||
366 | static ssize_t | |
367 | event_type_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
368 | loff_t *ppos) | |
369 | { | |
370 | struct ftrace_event_call *call = filp->private_data; | |
371 | char buf[64]; | |
372 | ||
373 | /* | |
374 | * If there's only one type, we can't change it. | |
375 | * And currently we always have printf type, and we | |
376 | * may or may not have raw type. | |
377 | * | |
378 | * This is a redundant check, the file should be read | |
379 | * only if this is the case anyway. | |
380 | */ | |
381 | ||
382 | if (!call->raw_init) | |
383 | return -EPERM; | |
384 | ||
385 | if (cnt >= sizeof(buf)) | |
386 | return -EINVAL; | |
387 | ||
388 | if (copy_from_user(&buf, ubuf, cnt)) | |
389 | return -EFAULT; | |
390 | ||
391 | buf[cnt] = 0; | |
392 | ||
393 | if (!strncmp(buf, "printf", 6) && | |
394 | (!buf[6] || isspace(buf[6]))) { | |
395 | ||
396 | call->type = TRACE_EVENT_TYPE_PRINTF; | |
397 | ||
398 | /* | |
399 | * If raw enabled, the disable it and enable | |
400 | * printf type. | |
401 | */ | |
402 | if (call->raw_enabled) { | |
403 | call->raw_enabled = 0; | |
404 | call->raw_unreg(); | |
405 | ||
406 | call->enabled = 1; | |
407 | call->regfunc(); | |
408 | } | |
409 | ||
410 | } else if (!strncmp(buf, "raw", 3) && | |
411 | (!buf[3] || isspace(buf[3]))) { | |
412 | ||
413 | call->type = TRACE_EVENT_TYPE_RAW; | |
414 | ||
415 | /* | |
416 | * If printf enabled, the disable it and enable | |
417 | * raw type. | |
418 | */ | |
419 | if (call->enabled) { | |
420 | call->enabled = 0; | |
421 | call->unregfunc(); | |
422 | ||
423 | call->raw_enabled = 1; | |
424 | call->raw_reg(); | |
425 | } | |
426 | } else | |
427 | return -EINVAL; | |
428 | ||
429 | *ppos += cnt; | |
430 | ||
431 | return cnt; | |
432 | } | |
433 | ||
434 | static ssize_t | |
435 | event_available_types_read(struct file *filp, char __user *ubuf, size_t cnt, | |
436 | loff_t *ppos) | |
437 | { | |
438 | struct ftrace_event_call *call = filp->private_data; | |
439 | char buf[16]; | |
440 | int r = 0; | |
441 | ||
442 | r += sprintf(buf, "printf\n"); | |
443 | ||
444 | if (call->raw_init) | |
445 | r += sprintf(buf+r, "raw\n"); | |
446 | ||
447 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
448 | } | |
449 | ||
91729ef9 SR |
450 | #undef FIELD |
451 | #define FIELD(type, name) \ | |
452 | #type, #name, offsetof(typeof(field), name), sizeof(field.name) | |
453 | ||
454 | static int trace_write_header(struct trace_seq *s) | |
455 | { | |
456 | struct trace_entry field; | |
457 | ||
458 | /* struct trace_entry */ | |
459 | return trace_seq_printf(s, | |
460 | "\tfield:%s %s;\toffset:%lu;\tsize:%lu;\n" | |
461 | "\tfield:%s %s;\toffset:%lu;\tsize:%lu;\n" | |
462 | "\tfield:%s %s;\toffset:%lu;\tsize:%lu;\n" | |
463 | "\tfield:%s %s;\toffset:%lu;\tsize:%lu;\n" | |
464 | "\tfield:%s %s;\toffset:%lu;\tsize:%lu;\n" | |
465 | "\n", | |
466 | FIELD(unsigned char, type), | |
467 | FIELD(unsigned char, flags), | |
468 | FIELD(unsigned char, preempt_count), | |
469 | FIELD(int, pid), | |
470 | FIELD(int, tgid)); | |
471 | } | |
981d081e SR |
472 | static ssize_t |
473 | event_format_read(struct file *filp, char __user *ubuf, size_t cnt, | |
474 | loff_t *ppos) | |
475 | { | |
476 | struct ftrace_event_call *call = filp->private_data; | |
477 | struct trace_seq *s; | |
478 | char *buf; | |
479 | int r; | |
480 | ||
481 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
482 | if (!s) | |
483 | return -ENOMEM; | |
484 | ||
485 | trace_seq_init(s); | |
486 | ||
487 | if (*ppos) | |
488 | return 0; | |
489 | ||
91729ef9 SR |
490 | /* If this fails, so will the show_format. */ |
491 | trace_write_header(s); | |
492 | ||
981d081e SR |
493 | r = call->show_format(s); |
494 | if (!r) { | |
495 | /* | |
496 | * ug! The format output is bigger than a PAGE!! | |
497 | */ | |
498 | buf = "FORMAT TOO BIG\n"; | |
499 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
500 | buf, strlen(buf)); | |
501 | goto out; | |
502 | } | |
503 | ||
504 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
505 | s->buffer, s->len); | |
506 | out: | |
507 | kfree(s); | |
508 | return r; | |
509 | } | |
510 | ||
b77e38aa SR |
511 | static const struct seq_operations show_event_seq_ops = { |
512 | .start = t_start, | |
513 | .next = t_next, | |
514 | .show = t_show, | |
515 | .stop = t_stop, | |
516 | }; | |
517 | ||
518 | static const struct seq_operations show_set_event_seq_ops = { | |
519 | .start = s_start, | |
520 | .next = s_next, | |
521 | .show = t_show, | |
522 | .stop = t_stop, | |
523 | }; | |
524 | ||
525 | static const struct file_operations ftrace_avail_fops = { | |
526 | .open = ftrace_event_seq_open, | |
527 | .read = seq_read, | |
528 | .llseek = seq_lseek, | |
529 | .release = seq_release, | |
530 | }; | |
531 | ||
532 | static const struct file_operations ftrace_set_event_fops = { | |
533 | .open = ftrace_event_seq_open, | |
534 | .read = seq_read, | |
535 | .write = ftrace_event_write, | |
536 | .llseek = seq_lseek, | |
537 | .release = seq_release, | |
538 | }; | |
539 | ||
1473e441 SR |
540 | static const struct file_operations ftrace_enable_fops = { |
541 | .open = tracing_open_generic, | |
542 | .read = event_enable_read, | |
543 | .write = event_enable_write, | |
544 | }; | |
545 | ||
fd994989 SR |
546 | static const struct file_operations ftrace_type_fops = { |
547 | .open = tracing_open_generic, | |
548 | .read = event_type_read, | |
549 | .write = event_type_write, | |
550 | }; | |
551 | ||
552 | static const struct file_operations ftrace_available_types_fops = { | |
553 | .open = tracing_open_generic, | |
554 | .read = event_available_types_read, | |
555 | }; | |
556 | ||
981d081e SR |
557 | static const struct file_operations ftrace_event_format_fops = { |
558 | .open = tracing_open_generic, | |
559 | .read = event_format_read, | |
560 | }; | |
561 | ||
1473e441 SR |
562 | static struct dentry *event_trace_events_dir(void) |
563 | { | |
564 | static struct dentry *d_tracer; | |
565 | static struct dentry *d_events; | |
566 | ||
567 | if (d_events) | |
568 | return d_events; | |
569 | ||
570 | d_tracer = tracing_init_dentry(); | |
571 | if (!d_tracer) | |
572 | return NULL; | |
573 | ||
574 | d_events = debugfs_create_dir("events", d_tracer); | |
575 | if (!d_events) | |
576 | pr_warning("Could not create debugfs " | |
577 | "'events' directory\n"); | |
578 | ||
579 | return d_events; | |
580 | } | |
581 | ||
6ecc2d1c SR |
582 | struct event_subsystem { |
583 | struct list_head list; | |
584 | const char *name; | |
585 | struct dentry *entry; | |
586 | }; | |
587 | ||
588 | static LIST_HEAD(event_subsystems); | |
589 | ||
590 | static struct dentry * | |
591 | event_subsystem_dir(const char *name, struct dentry *d_events) | |
592 | { | |
593 | struct event_subsystem *system; | |
594 | ||
595 | /* First see if we did not already create this dir */ | |
596 | list_for_each_entry(system, &event_subsystems, list) { | |
597 | if (strcmp(system->name, name) == 0) | |
598 | return system->entry; | |
599 | } | |
600 | ||
601 | /* need to create new entry */ | |
602 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
603 | if (!system) { | |
604 | pr_warning("No memory to create event subsystem %s\n", | |
605 | name); | |
606 | return d_events; | |
607 | } | |
608 | ||
609 | system->entry = debugfs_create_dir(name, d_events); | |
610 | if (!system->entry) { | |
611 | pr_warning("Could not create event subsystem %s\n", | |
612 | name); | |
613 | kfree(system); | |
614 | return d_events; | |
615 | } | |
616 | ||
617 | system->name = name; | |
618 | list_add(&system->list, &event_subsystems); | |
619 | ||
620 | return system->entry; | |
621 | } | |
622 | ||
1473e441 SR |
623 | static int |
624 | event_create_dir(struct ftrace_event_call *call, struct dentry *d_events) | |
625 | { | |
626 | struct dentry *entry; | |
fd994989 | 627 | int ret; |
1473e441 | 628 | |
6ecc2d1c SR |
629 | /* |
630 | * If the trace point header did not define TRACE_SYSTEM | |
631 | * then the system would be called "TRACE_SYSTEM". | |
632 | */ | |
633 | if (strcmp(call->system, "TRACE_SYSTEM") != 0) | |
634 | d_events = event_subsystem_dir(call->system, d_events); | |
635 | ||
fd994989 SR |
636 | if (call->raw_init) { |
637 | ret = call->raw_init(); | |
638 | if (ret < 0) { | |
639 | pr_warning("Could not initialize trace point" | |
640 | " events/%s\n", call->name); | |
641 | return ret; | |
642 | } | |
643 | } | |
644 | ||
645 | /* default the output to printf */ | |
646 | call->type = TRACE_EVENT_TYPE_PRINTF; | |
647 | ||
1473e441 SR |
648 | call->dir = debugfs_create_dir(call->name, d_events); |
649 | if (!call->dir) { | |
650 | pr_warning("Could not create debugfs " | |
651 | "'%s' directory\n", call->name); | |
652 | return -1; | |
653 | } | |
654 | ||
655 | entry = debugfs_create_file("enable", 0644, call->dir, call, | |
656 | &ftrace_enable_fops); | |
657 | if (!entry) | |
658 | pr_warning("Could not create debugfs " | |
659 | "'%s/enable' entry\n", call->name); | |
660 | ||
fd994989 SR |
661 | /* Only let type be writable, if we can change it */ |
662 | entry = debugfs_create_file("type", | |
663 | call->raw_init ? 0644 : 0444, | |
664 | call->dir, call, | |
665 | &ftrace_type_fops); | |
666 | if (!entry) | |
667 | pr_warning("Could not create debugfs " | |
668 | "'%s/type' entry\n", call->name); | |
669 | ||
670 | entry = debugfs_create_file("available_types", 0444, call->dir, call, | |
671 | &ftrace_available_types_fops); | |
672 | if (!entry) | |
673 | pr_warning("Could not create debugfs " | |
981d081e SR |
674 | "'%s/available_types' entry\n", call->name); |
675 | ||
676 | /* A trace may not want to export its format */ | |
677 | if (!call->show_format) | |
678 | return 0; | |
679 | ||
680 | entry = debugfs_create_file("format", 0444, call->dir, call, | |
681 | &ftrace_event_format_fops); | |
682 | if (!entry) | |
683 | pr_warning("Could not create debugfs " | |
684 | "'%s/format' entry\n", call->name); | |
fd994989 | 685 | |
1473e441 SR |
686 | return 0; |
687 | } | |
688 | ||
b77e38aa SR |
689 | static __init int event_trace_init(void) |
690 | { | |
1473e441 | 691 | struct ftrace_event_call *call = __start_ftrace_events; |
b77e38aa SR |
692 | struct dentry *d_tracer; |
693 | struct dentry *entry; | |
1473e441 | 694 | struct dentry *d_events; |
b77e38aa SR |
695 | |
696 | d_tracer = tracing_init_dentry(); | |
697 | if (!d_tracer) | |
698 | return 0; | |
699 | ||
700 | entry = debugfs_create_file("available_events", 0444, d_tracer, | |
701 | (void *)&show_event_seq_ops, | |
702 | &ftrace_avail_fops); | |
703 | if (!entry) | |
704 | pr_warning("Could not create debugfs " | |
705 | "'available_events' entry\n"); | |
706 | ||
707 | entry = debugfs_create_file("set_event", 0644, d_tracer, | |
708 | (void *)&show_set_event_seq_ops, | |
709 | &ftrace_set_event_fops); | |
710 | if (!entry) | |
711 | pr_warning("Could not create debugfs " | |
712 | "'set_event' entry\n"); | |
713 | ||
1473e441 SR |
714 | d_events = event_trace_events_dir(); |
715 | if (!d_events) | |
716 | return 0; | |
717 | ||
718 | events_for_each(call) { | |
719 | /* The linker may leave blanks */ | |
720 | if (!call->name) | |
721 | continue; | |
722 | event_create_dir(call, d_events); | |
723 | } | |
724 | ||
b77e38aa SR |
725 | return 0; |
726 | } | |
727 | fs_initcall(event_trace_init); |