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> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
e6187007 | 19 | #include <linux/delay.h> |
b77e38aa | 20 | |
020e5f85 LZ |
21 | #include <asm/setup.h> |
22 | ||
91729ef9 | 23 | #include "trace_output.h" |
b77e38aa | 24 | |
4e5292ea | 25 | #undef TRACE_SYSTEM |
b628b3e6 SR |
26 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
27 | ||
20c8928a | 28 | DEFINE_MUTEX(event_mutex); |
11a241a3 | 29 | |
04295780 SR |
30 | DEFINE_MUTEX(event_storage_mutex); |
31 | EXPORT_SYMBOL_GPL(event_storage_mutex); | |
32 | ||
33 | char event_storage[EVENT_STORAGE_SIZE]; | |
34 | EXPORT_SYMBOL_GPL(event_storage); | |
35 | ||
a59fd602 | 36 | LIST_HEAD(ftrace_events); |
8728fe50 | 37 | LIST_HEAD(ftrace_common_fields); |
a59fd602 | 38 | |
2e33af02 SR |
39 | struct list_head * |
40 | trace_get_fields(struct ftrace_event_call *event_call) | |
41 | { | |
42 | if (!event_call->class->get_fields) | |
43 | return &event_call->class->fields; | |
44 | return event_call->class->get_fields(event_call); | |
45 | } | |
46 | ||
8728fe50 LZ |
47 | static int __trace_define_field(struct list_head *head, const char *type, |
48 | const char *name, int offset, int size, | |
49 | int is_signed, int filter_type) | |
cf027f64 TZ |
50 | { |
51 | struct ftrace_event_field *field; | |
52 | ||
fe9f57f2 | 53 | field = kzalloc(sizeof(*field), GFP_KERNEL); |
cf027f64 TZ |
54 | if (!field) |
55 | goto err; | |
fe9f57f2 | 56 | |
cf027f64 TZ |
57 | field->name = kstrdup(name, GFP_KERNEL); |
58 | if (!field->name) | |
59 | goto err; | |
fe9f57f2 | 60 | |
cf027f64 TZ |
61 | field->type = kstrdup(type, GFP_KERNEL); |
62 | if (!field->type) | |
63 | goto err; | |
fe9f57f2 | 64 | |
43b51ead LZ |
65 | if (filter_type == FILTER_OTHER) |
66 | field->filter_type = filter_assign_type(type); | |
67 | else | |
68 | field->filter_type = filter_type; | |
69 | ||
cf027f64 TZ |
70 | field->offset = offset; |
71 | field->size = size; | |
a118e4d1 | 72 | field->is_signed = is_signed; |
aa38e9fc | 73 | |
2e33af02 | 74 | list_add(&field->link, head); |
cf027f64 TZ |
75 | |
76 | return 0; | |
fe9f57f2 | 77 | |
cf027f64 | 78 | err: |
7b60997f | 79 | if (field) |
cf027f64 | 80 | kfree(field->name); |
cf027f64 | 81 | kfree(field); |
fe9f57f2 | 82 | |
cf027f64 TZ |
83 | return -ENOMEM; |
84 | } | |
8728fe50 LZ |
85 | |
86 | int trace_define_field(struct ftrace_event_call *call, const char *type, | |
87 | const char *name, int offset, int size, int is_signed, | |
88 | int filter_type) | |
89 | { | |
90 | struct list_head *head; | |
91 | ||
92 | if (WARN_ON(!call->class)) | |
93 | return 0; | |
94 | ||
95 | head = trace_get_fields(call); | |
96 | return __trace_define_field(head, type, name, offset, size, | |
97 | is_signed, filter_type); | |
98 | } | |
17c873ec | 99 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 100 | |
e647d6b3 | 101 | #define __common_field(type, item) \ |
8728fe50 LZ |
102 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
103 | "common_" #item, \ | |
104 | offsetof(typeof(ent), item), \ | |
105 | sizeof(ent.item), \ | |
106 | is_signed_type(type), FILTER_OTHER); \ | |
e647d6b3 LZ |
107 | if (ret) \ |
108 | return ret; | |
109 | ||
8728fe50 | 110 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
111 | { |
112 | int ret; | |
113 | struct trace_entry ent; | |
114 | ||
115 | __common_field(unsigned short, type); | |
116 | __common_field(unsigned char, flags); | |
117 | __common_field(unsigned char, preempt_count); | |
118 | __common_field(int, pid); | |
a3a4a5ac | 119 | __common_field(int, padding); |
e647d6b3 LZ |
120 | |
121 | return ret; | |
122 | } | |
123 | ||
bd1a5c84 | 124 | void trace_destroy_fields(struct ftrace_event_call *call) |
2df75e41 LZ |
125 | { |
126 | struct ftrace_event_field *field, *next; | |
2e33af02 | 127 | struct list_head *head; |
2df75e41 | 128 | |
2e33af02 SR |
129 | head = trace_get_fields(call); |
130 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 LZ |
131 | list_del(&field->link); |
132 | kfree(field->type); | |
133 | kfree(field->name); | |
134 | kfree(field); | |
135 | } | |
136 | } | |
137 | ||
87d9b4e1 LZ |
138 | int trace_event_raw_init(struct ftrace_event_call *call) |
139 | { | |
140 | int id; | |
141 | ||
80decc70 | 142 | id = register_ftrace_event(&call->event); |
87d9b4e1 LZ |
143 | if (!id) |
144 | return -ENODEV; | |
87d9b4e1 LZ |
145 | |
146 | return 0; | |
147 | } | |
148 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
149 | ||
ceec0b6f JO |
150 | int ftrace_event_reg(struct ftrace_event_call *call, |
151 | enum trace_reg type, void *data) | |
a1d0ce82 SR |
152 | { |
153 | switch (type) { | |
154 | case TRACE_REG_REGISTER: | |
155 | return tracepoint_probe_register(call->name, | |
156 | call->class->probe, | |
157 | call); | |
158 | case TRACE_REG_UNREGISTER: | |
159 | tracepoint_probe_unregister(call->name, | |
160 | call->class->probe, | |
161 | call); | |
162 | return 0; | |
163 | ||
164 | #ifdef CONFIG_PERF_EVENTS | |
165 | case TRACE_REG_PERF_REGISTER: | |
166 | return tracepoint_probe_register(call->name, | |
167 | call->class->perf_probe, | |
168 | call); | |
169 | case TRACE_REG_PERF_UNREGISTER: | |
170 | tracepoint_probe_unregister(call->name, | |
171 | call->class->perf_probe, | |
172 | call); | |
173 | return 0; | |
ceec0b6f JO |
174 | case TRACE_REG_PERF_OPEN: |
175 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
176 | case TRACE_REG_PERF_ADD: |
177 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 178 | return 0; |
a1d0ce82 SR |
179 | #endif |
180 | } | |
181 | return 0; | |
182 | } | |
183 | EXPORT_SYMBOL_GPL(ftrace_event_reg); | |
184 | ||
e870e9a1 LZ |
185 | void trace_event_enable_cmd_record(bool enable) |
186 | { | |
187 | struct ftrace_event_call *call; | |
188 | ||
189 | mutex_lock(&event_mutex); | |
190 | list_for_each_entry(call, &ftrace_events, list) { | |
191 | if (!(call->flags & TRACE_EVENT_FL_ENABLED)) | |
192 | continue; | |
193 | ||
194 | if (enable) { | |
195 | tracing_start_cmdline_record(); | |
196 | call->flags |= TRACE_EVENT_FL_RECORDED_CMD; | |
197 | } else { | |
198 | tracing_stop_cmdline_record(); | |
199 | call->flags &= ~TRACE_EVENT_FL_RECORDED_CMD; | |
200 | } | |
201 | } | |
202 | mutex_unlock(&event_mutex); | |
203 | } | |
204 | ||
3b8e4273 | 205 | static int ftrace_event_enable_disable(struct ftrace_event_call *call, |
fd994989 SR |
206 | int enable) |
207 | { | |
3b8e4273 LZ |
208 | int ret = 0; |
209 | ||
fd994989 SR |
210 | switch (enable) { |
211 | case 0: | |
553552ce SR |
212 | if (call->flags & TRACE_EVENT_FL_ENABLED) { |
213 | call->flags &= ~TRACE_EVENT_FL_ENABLED; | |
e870e9a1 LZ |
214 | if (call->flags & TRACE_EVENT_FL_RECORDED_CMD) { |
215 | tracing_stop_cmdline_record(); | |
216 | call->flags &= ~TRACE_EVENT_FL_RECORDED_CMD; | |
217 | } | |
ceec0b6f | 218 | call->class->reg(call, TRACE_REG_UNREGISTER, NULL); |
fd994989 | 219 | } |
fd994989 SR |
220 | break; |
221 | case 1: | |
553552ce | 222 | if (!(call->flags & TRACE_EVENT_FL_ENABLED)) { |
e870e9a1 LZ |
223 | if (trace_flags & TRACE_ITER_RECORD_CMD) { |
224 | tracing_start_cmdline_record(); | |
225 | call->flags |= TRACE_EVENT_FL_RECORDED_CMD; | |
226 | } | |
ceec0b6f | 227 | ret = call->class->reg(call, TRACE_REG_REGISTER, NULL); |
3b8e4273 LZ |
228 | if (ret) { |
229 | tracing_stop_cmdline_record(); | |
230 | pr_info("event trace: Could not enable event " | |
231 | "%s\n", call->name); | |
232 | break; | |
233 | } | |
553552ce | 234 | call->flags |= TRACE_EVENT_FL_ENABLED; |
fd994989 | 235 | } |
fd994989 SR |
236 | break; |
237 | } | |
3b8e4273 LZ |
238 | |
239 | return ret; | |
fd994989 SR |
240 | } |
241 | ||
0e907c99 Z |
242 | static void ftrace_clear_events(void) |
243 | { | |
244 | struct ftrace_event_call *call; | |
245 | ||
246 | mutex_lock(&event_mutex); | |
247 | list_for_each_entry(call, &ftrace_events, list) { | |
248 | ftrace_event_enable_disable(call, 0); | |
249 | } | |
250 | mutex_unlock(&event_mutex); | |
251 | } | |
252 | ||
e9dbfae5 SR |
253 | static void __put_system(struct event_subsystem *system) |
254 | { | |
255 | struct event_filter *filter = system->filter; | |
256 | ||
257 | WARN_ON_ONCE(system->ref_count == 0); | |
258 | if (--system->ref_count) | |
259 | return; | |
260 | ||
261 | if (filter) { | |
262 | kfree(filter->filter_string); | |
263 | kfree(filter); | |
264 | } | |
265 | kfree(system->name); | |
266 | kfree(system); | |
267 | } | |
268 | ||
269 | static void __get_system(struct event_subsystem *system) | |
270 | { | |
271 | WARN_ON_ONCE(system->ref_count == 0); | |
272 | system->ref_count++; | |
273 | } | |
274 | ||
275 | static void put_system(struct event_subsystem *system) | |
276 | { | |
277 | mutex_lock(&event_mutex); | |
278 | __put_system(system); | |
279 | mutex_unlock(&event_mutex); | |
280 | } | |
281 | ||
8f31bfe5 LZ |
282 | /* |
283 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
284 | */ | |
285 | static int __ftrace_set_clr_event(const char *match, const char *sub, | |
286 | const char *event, int set) | |
b77e38aa | 287 | { |
a59fd602 | 288 | struct ftrace_event_call *call; |
29f93943 | 289 | int ret = -EINVAL; |
8f31bfe5 LZ |
290 | |
291 | mutex_lock(&event_mutex); | |
292 | list_for_each_entry(call, &ftrace_events, list) { | |
293 | ||
a1d0ce82 | 294 | if (!call->name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
295 | continue; |
296 | ||
297 | if (match && | |
298 | strcmp(match, call->name) != 0 && | |
8f082018 | 299 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
300 | continue; |
301 | ||
8f082018 | 302 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
303 | continue; |
304 | ||
305 | if (event && strcmp(event, call->name) != 0) | |
306 | continue; | |
307 | ||
308 | ftrace_event_enable_disable(call, set); | |
309 | ||
310 | ret = 0; | |
311 | } | |
312 | mutex_unlock(&event_mutex); | |
313 | ||
314 | return ret; | |
315 | } | |
316 | ||
317 | static int ftrace_set_clr_event(char *buf, int set) | |
318 | { | |
b628b3e6 | 319 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
320 | |
321 | /* | |
322 | * The buf format can be <subsystem>:<event-name> | |
323 | * *:<event-name> means any event by that name. | |
324 | * :<event-name> is the same. | |
325 | * | |
326 | * <subsystem>:* means all events in that subsystem | |
327 | * <subsystem>: means the same. | |
328 | * | |
329 | * <name> (no ':') means all events in a subsystem with | |
330 | * the name <name> or any event that matches <name> | |
331 | */ | |
332 | ||
333 | match = strsep(&buf, ":"); | |
334 | if (buf) { | |
335 | sub = match; | |
336 | event = buf; | |
337 | match = NULL; | |
338 | ||
339 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
340 | sub = NULL; | |
341 | if (!strlen(event) || strcmp(event, "*") == 0) | |
342 | event = NULL; | |
343 | } | |
b77e38aa | 344 | |
8f31bfe5 | 345 | return __ftrace_set_clr_event(match, sub, event, set); |
b77e38aa SR |
346 | } |
347 | ||
4671c794 SR |
348 | /** |
349 | * trace_set_clr_event - enable or disable an event | |
350 | * @system: system name to match (NULL for any system) | |
351 | * @event: event name to match (NULL for all events, within system) | |
352 | * @set: 1 to enable, 0 to disable | |
353 | * | |
354 | * This is a way for other parts of the kernel to enable or disable | |
355 | * event recording. | |
356 | * | |
357 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
358 | * registered events. | |
359 | */ | |
360 | int trace_set_clr_event(const char *system, const char *event, int set) | |
361 | { | |
362 | return __ftrace_set_clr_event(NULL, system, event, set); | |
363 | } | |
56355b83 | 364 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 365 | |
b77e38aa SR |
366 | /* 128 should be much more than enough */ |
367 | #define EVENT_BUF_SIZE 127 | |
368 | ||
369 | static ssize_t | |
370 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
371 | size_t cnt, loff_t *ppos) | |
372 | { | |
48966364 | 373 | struct trace_parser parser; |
4ba7978e | 374 | ssize_t read, ret; |
b77e38aa | 375 | |
4ba7978e | 376 | if (!cnt) |
b77e38aa SR |
377 | return 0; |
378 | ||
1852fcce SR |
379 | ret = tracing_update_buffers(); |
380 | if (ret < 0) | |
381 | return ret; | |
382 | ||
48966364 | 383 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
384 | return -ENOMEM; |
385 | ||
48966364 | 386 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
387 | ||
4ba7978e | 388 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 389 | int set = 1; |
b77e38aa | 390 | |
48966364 | 391 | if (*parser.buffer == '!') |
b77e38aa | 392 | set = 0; |
b77e38aa | 393 | |
48966364 | 394 | parser.buffer[parser.idx] = 0; |
395 | ||
396 | ret = ftrace_set_clr_event(parser.buffer + !set, set); | |
b77e38aa | 397 | if (ret) |
48966364 | 398 | goto out_put; |
b77e38aa | 399 | } |
b77e38aa SR |
400 | |
401 | ret = read; | |
402 | ||
48966364 | 403 | out_put: |
404 | trace_parser_put(&parser); | |
b77e38aa SR |
405 | |
406 | return ret; | |
407 | } | |
408 | ||
409 | static void * | |
410 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
411 | { | |
30bd39cd | 412 | struct ftrace_event_call *call = v; |
b77e38aa SR |
413 | |
414 | (*pos)++; | |
415 | ||
30bd39cd | 416 | list_for_each_entry_continue(call, &ftrace_events, list) { |
40e26815 SR |
417 | /* |
418 | * The ftrace subsystem is for showing formats only. | |
419 | * They can not be enabled or disabled via the event files. | |
420 | */ | |
a1d0ce82 | 421 | if (call->class && call->class->reg) |
30bd39cd | 422 | return call; |
40e26815 | 423 | } |
b77e38aa | 424 | |
30bd39cd | 425 | return NULL; |
b77e38aa SR |
426 | } |
427 | ||
428 | static void *t_start(struct seq_file *m, loff_t *pos) | |
429 | { | |
30bd39cd | 430 | struct ftrace_event_call *call; |
e1c7e2a6 LZ |
431 | loff_t l; |
432 | ||
20c8928a | 433 | mutex_lock(&event_mutex); |
e1c7e2a6 | 434 | |
30bd39cd | 435 | call = list_entry(&ftrace_events, struct ftrace_event_call, list); |
e1c7e2a6 | 436 | for (l = 0; l <= *pos; ) { |
30bd39cd | 437 | call = t_next(m, call, &l); |
e1c7e2a6 LZ |
438 | if (!call) |
439 | break; | |
440 | } | |
441 | return call; | |
b77e38aa SR |
442 | } |
443 | ||
444 | static void * | |
445 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
446 | { | |
30bd39cd | 447 | struct ftrace_event_call *call = v; |
b77e38aa SR |
448 | |
449 | (*pos)++; | |
450 | ||
30bd39cd | 451 | list_for_each_entry_continue(call, &ftrace_events, list) { |
553552ce | 452 | if (call->flags & TRACE_EVENT_FL_ENABLED) |
30bd39cd | 453 | return call; |
b77e38aa SR |
454 | } |
455 | ||
30bd39cd | 456 | return NULL; |
b77e38aa SR |
457 | } |
458 | ||
459 | static void *s_start(struct seq_file *m, loff_t *pos) | |
460 | { | |
30bd39cd | 461 | struct ftrace_event_call *call; |
e1c7e2a6 LZ |
462 | loff_t l; |
463 | ||
20c8928a | 464 | mutex_lock(&event_mutex); |
e1c7e2a6 | 465 | |
30bd39cd | 466 | call = list_entry(&ftrace_events, struct ftrace_event_call, list); |
e1c7e2a6 | 467 | for (l = 0; l <= *pos; ) { |
30bd39cd | 468 | call = s_next(m, call, &l); |
e1c7e2a6 LZ |
469 | if (!call) |
470 | break; | |
471 | } | |
472 | return call; | |
b77e38aa SR |
473 | } |
474 | ||
475 | static int t_show(struct seq_file *m, void *v) | |
476 | { | |
477 | struct ftrace_event_call *call = v; | |
478 | ||
8f082018 SR |
479 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
480 | seq_printf(m, "%s:", call->class->system); | |
b77e38aa SR |
481 | seq_printf(m, "%s\n", call->name); |
482 | ||
483 | return 0; | |
484 | } | |
485 | ||
486 | static void t_stop(struct seq_file *m, void *p) | |
487 | { | |
20c8928a | 488 | mutex_unlock(&event_mutex); |
b77e38aa SR |
489 | } |
490 | ||
491 | static int | |
492 | ftrace_event_seq_open(struct inode *inode, struct file *file) | |
493 | { | |
b77e38aa SR |
494 | const struct seq_operations *seq_ops; |
495 | ||
496 | if ((file->f_mode & FMODE_WRITE) && | |
8650ae32 | 497 | (file->f_flags & O_TRUNC)) |
b77e38aa SR |
498 | ftrace_clear_events(); |
499 | ||
500 | seq_ops = inode->i_private; | |
20c8928a | 501 | return seq_open(file, seq_ops); |
b77e38aa SR |
502 | } |
503 | ||
1473e441 SR |
504 | static ssize_t |
505 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
506 | loff_t *ppos) | |
507 | { | |
508 | struct ftrace_event_call *call = filp->private_data; | |
509 | char *buf; | |
510 | ||
553552ce | 511 | if (call->flags & TRACE_EVENT_FL_ENABLED) |
1473e441 SR |
512 | buf = "1\n"; |
513 | else | |
514 | buf = "0\n"; | |
515 | ||
516 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
517 | } | |
518 | ||
519 | static ssize_t | |
520 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
521 | loff_t *ppos) | |
522 | { | |
523 | struct ftrace_event_call *call = filp->private_data; | |
1473e441 SR |
524 | unsigned long val; |
525 | int ret; | |
526 | ||
22fe9b54 PH |
527 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
528 | if (ret) | |
1473e441 SR |
529 | return ret; |
530 | ||
1852fcce SR |
531 | ret = tracing_update_buffers(); |
532 | if (ret < 0) | |
533 | return ret; | |
534 | ||
1473e441 SR |
535 | switch (val) { |
536 | case 0: | |
1473e441 | 537 | case 1: |
11a241a3 | 538 | mutex_lock(&event_mutex); |
3b8e4273 | 539 | ret = ftrace_event_enable_disable(call, val); |
11a241a3 | 540 | mutex_unlock(&event_mutex); |
1473e441 SR |
541 | break; |
542 | ||
543 | default: | |
544 | return -EINVAL; | |
545 | } | |
546 | ||
547 | *ppos += cnt; | |
548 | ||
3b8e4273 | 549 | return ret ? ret : cnt; |
1473e441 SR |
550 | } |
551 | ||
8ae79a13 SR |
552 | static ssize_t |
553 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
554 | loff_t *ppos) | |
555 | { | |
c142b15d | 556 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
40ee4dff | 557 | struct event_subsystem *system = filp->private_data; |
8ae79a13 SR |
558 | struct ftrace_event_call *call; |
559 | char buf[2]; | |
c142b15d | 560 | int set = 0; |
8ae79a13 SR |
561 | int ret; |
562 | ||
8ae79a13 SR |
563 | mutex_lock(&event_mutex); |
564 | list_for_each_entry(call, &ftrace_events, list) { | |
a1d0ce82 | 565 | if (!call->name || !call->class || !call->class->reg) |
8ae79a13 SR |
566 | continue; |
567 | ||
40ee4dff | 568 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
569 | continue; |
570 | ||
571 | /* | |
572 | * We need to find out if all the events are set | |
573 | * or if all events or cleared, or if we have | |
574 | * a mixture. | |
575 | */ | |
553552ce | 576 | set |= (1 << !!(call->flags & TRACE_EVENT_FL_ENABLED)); |
c142b15d | 577 | |
8ae79a13 SR |
578 | /* |
579 | * If we have a mixture, no need to look further. | |
580 | */ | |
c142b15d | 581 | if (set == 3) |
8ae79a13 SR |
582 | break; |
583 | } | |
584 | mutex_unlock(&event_mutex); | |
585 | ||
c142b15d | 586 | buf[0] = set_to_char[set]; |
8ae79a13 | 587 | buf[1] = '\n'; |
8ae79a13 SR |
588 | |
589 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
590 | ||
591 | return ret; | |
592 | } | |
593 | ||
594 | static ssize_t | |
595 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
596 | loff_t *ppos) | |
597 | { | |
40ee4dff SR |
598 | struct event_subsystem *system = filp->private_data; |
599 | const char *name = NULL; | |
8ae79a13 | 600 | unsigned long val; |
8ae79a13 SR |
601 | ssize_t ret; |
602 | ||
22fe9b54 PH |
603 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
604 | if (ret) | |
8ae79a13 SR |
605 | return ret; |
606 | ||
607 | ret = tracing_update_buffers(); | |
608 | if (ret < 0) | |
609 | return ret; | |
610 | ||
8f31bfe5 | 611 | if (val != 0 && val != 1) |
8ae79a13 | 612 | return -EINVAL; |
8ae79a13 | 613 | |
40ee4dff SR |
614 | /* |
615 | * Opening of "enable" adds a ref count to system, | |
616 | * so the name is safe to use. | |
617 | */ | |
618 | if (system) | |
619 | name = system->name; | |
620 | ||
621 | ret = __ftrace_set_clr_event(NULL, name, NULL, val); | |
8ae79a13 | 622 | if (ret) |
8f31bfe5 | 623 | goto out; |
8ae79a13 SR |
624 | |
625 | ret = cnt; | |
626 | ||
8f31bfe5 | 627 | out: |
8ae79a13 SR |
628 | *ppos += cnt; |
629 | ||
630 | return ret; | |
631 | } | |
632 | ||
2a37a3df SR |
633 | enum { |
634 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
635 | FORMAT_FIELD_SEPERATOR = 2, |
636 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
637 | }; |
638 | ||
639 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 640 | { |
2a37a3df | 641 | struct ftrace_event_call *call = m->private; |
5a65e956 | 642 | struct ftrace_event_field *field; |
86397dc3 LZ |
643 | struct list_head *common_head = &ftrace_common_fields; |
644 | struct list_head *head = trace_get_fields(call); | |
981d081e | 645 | |
2a37a3df | 646 | (*pos)++; |
5a65e956 | 647 | |
2a37a3df SR |
648 | switch ((unsigned long)v) { |
649 | case FORMAT_HEADER: | |
86397dc3 LZ |
650 | if (unlikely(list_empty(common_head))) |
651 | return NULL; | |
652 | ||
653 | field = list_entry(common_head->prev, | |
654 | struct ftrace_event_field, link); | |
655 | return field; | |
5a65e956 | 656 | |
86397dc3 | 657 | case FORMAT_FIELD_SEPERATOR: |
2a37a3df SR |
658 | if (unlikely(list_empty(head))) |
659 | return NULL; | |
5a65e956 | 660 | |
2a37a3df SR |
661 | field = list_entry(head->prev, struct ftrace_event_field, link); |
662 | return field; | |
5a65e956 | 663 | |
2a37a3df SR |
664 | case FORMAT_PRINTFMT: |
665 | /* all done */ | |
666 | return NULL; | |
5a65e956 LJ |
667 | } |
668 | ||
2a37a3df | 669 | field = v; |
86397dc3 LZ |
670 | if (field->link.prev == common_head) |
671 | return (void *)FORMAT_FIELD_SEPERATOR; | |
672 | else if (field->link.prev == head) | |
2a37a3df SR |
673 | return (void *)FORMAT_PRINTFMT; |
674 | ||
675 | field = list_entry(field->link.prev, struct ftrace_event_field, link); | |
676 | ||
2a37a3df | 677 | return field; |
8728fe50 | 678 | } |
5a65e956 | 679 | |
2a37a3df | 680 | static void *f_start(struct seq_file *m, loff_t *pos) |
8728fe50 | 681 | { |
2a37a3df SR |
682 | loff_t l = 0; |
683 | void *p; | |
5a65e956 | 684 | |
2a37a3df SR |
685 | /* Start by showing the header */ |
686 | if (!*pos) | |
687 | return (void *)FORMAT_HEADER; | |
688 | ||
689 | p = (void *)FORMAT_HEADER; | |
690 | do { | |
691 | p = f_next(m, p, &l); | |
692 | } while (p && l < *pos); | |
693 | ||
694 | return p; | |
695 | } | |
696 | ||
697 | static int f_show(struct seq_file *m, void *v) | |
698 | { | |
699 | struct ftrace_event_call *call = m->private; | |
700 | struct ftrace_event_field *field; | |
701 | const char *array_descriptor; | |
702 | ||
703 | switch ((unsigned long)v) { | |
704 | case FORMAT_HEADER: | |
705 | seq_printf(m, "name: %s\n", call->name); | |
706 | seq_printf(m, "ID: %d\n", call->event.type); | |
707 | seq_printf(m, "format:\n"); | |
8728fe50 | 708 | return 0; |
5a65e956 | 709 | |
86397dc3 LZ |
710 | case FORMAT_FIELD_SEPERATOR: |
711 | seq_putc(m, '\n'); | |
712 | return 0; | |
713 | ||
2a37a3df SR |
714 | case FORMAT_PRINTFMT: |
715 | seq_printf(m, "\nprint fmt: %s\n", | |
716 | call->print_fmt); | |
717 | return 0; | |
981d081e | 718 | } |
8728fe50 | 719 | |
2a37a3df | 720 | field = v; |
8728fe50 | 721 | |
2a37a3df SR |
722 | /* |
723 | * Smartly shows the array type(except dynamic array). | |
724 | * Normal: | |
725 | * field:TYPE VAR | |
726 | * If TYPE := TYPE[LEN], it is shown: | |
727 | * field:TYPE VAR[LEN] | |
728 | */ | |
729 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 730 | |
2a37a3df SR |
731 | if (!strncmp(field->type, "__data_loc", 10)) |
732 | array_descriptor = NULL; | |
8728fe50 | 733 | |
2a37a3df SR |
734 | if (!array_descriptor) |
735 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
736 | field->type, field->name, field->offset, | |
737 | field->size, !!field->is_signed); | |
738 | else | |
739 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
740 | (int)(array_descriptor - field->type), | |
741 | field->type, field->name, | |
742 | array_descriptor, field->offset, | |
743 | field->size, !!field->is_signed); | |
8728fe50 | 744 | |
2a37a3df SR |
745 | return 0; |
746 | } | |
5a65e956 | 747 | |
2a37a3df SR |
748 | static void f_stop(struct seq_file *m, void *p) |
749 | { | |
750 | } | |
981d081e | 751 | |
2a37a3df SR |
752 | static const struct seq_operations trace_format_seq_ops = { |
753 | .start = f_start, | |
754 | .next = f_next, | |
755 | .stop = f_stop, | |
756 | .show = f_show, | |
757 | }; | |
758 | ||
759 | static int trace_format_open(struct inode *inode, struct file *file) | |
760 | { | |
761 | struct ftrace_event_call *call = inode->i_private; | |
762 | struct seq_file *m; | |
763 | int ret; | |
764 | ||
765 | ret = seq_open(file, &trace_format_seq_ops); | |
766 | if (ret < 0) | |
767 | return ret; | |
768 | ||
769 | m = file->private_data; | |
770 | m->private = call; | |
771 | ||
772 | return 0; | |
981d081e SR |
773 | } |
774 | ||
23725aee PZ |
775 | static ssize_t |
776 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
777 | { | |
778 | struct ftrace_event_call *call = filp->private_data; | |
779 | struct trace_seq *s; | |
780 | int r; | |
781 | ||
782 | if (*ppos) | |
783 | return 0; | |
784 | ||
785 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
786 | if (!s) | |
787 | return -ENOMEM; | |
788 | ||
789 | trace_seq_init(s); | |
32c0edae | 790 | trace_seq_printf(s, "%d\n", call->event.type); |
23725aee PZ |
791 | |
792 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
793 | s->buffer, s->len); | |
794 | kfree(s); | |
795 | return r; | |
796 | } | |
797 | ||
7ce7e424 TZ |
798 | static ssize_t |
799 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
800 | loff_t *ppos) | |
801 | { | |
802 | struct ftrace_event_call *call = filp->private_data; | |
803 | struct trace_seq *s; | |
804 | int r; | |
805 | ||
806 | if (*ppos) | |
807 | return 0; | |
808 | ||
809 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
810 | if (!s) | |
811 | return -ENOMEM; | |
812 | ||
813 | trace_seq_init(s); | |
814 | ||
8b372562 | 815 | print_event_filter(call, s); |
4bda2d51 | 816 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
817 | |
818 | kfree(s); | |
819 | ||
820 | return r; | |
821 | } | |
822 | ||
823 | static ssize_t | |
824 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
825 | loff_t *ppos) | |
826 | { | |
827 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 828 | char *buf; |
7ce7e424 TZ |
829 | int err; |
830 | ||
8b372562 | 831 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
832 | return -EINVAL; |
833 | ||
8b372562 TZ |
834 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
835 | if (!buf) | |
7ce7e424 TZ |
836 | return -ENOMEM; |
837 | ||
8b372562 TZ |
838 | if (copy_from_user(buf, ubuf, cnt)) { |
839 | free_page((unsigned long) buf); | |
840 | return -EFAULT; | |
7ce7e424 | 841 | } |
8b372562 | 842 | buf[cnt] = '\0'; |
7ce7e424 | 843 | |
8b372562 TZ |
844 | err = apply_event_filter(call, buf); |
845 | free_page((unsigned long) buf); | |
846 | if (err < 0) | |
44e9c8b7 | 847 | return err; |
0a19e53c | 848 | |
7ce7e424 TZ |
849 | *ppos += cnt; |
850 | ||
851 | return cnt; | |
852 | } | |
853 | ||
e9dbfae5 SR |
854 | static LIST_HEAD(event_subsystems); |
855 | ||
856 | static int subsystem_open(struct inode *inode, struct file *filp) | |
857 | { | |
858 | struct event_subsystem *system = NULL; | |
859 | int ret; | |
860 | ||
40ee4dff SR |
861 | if (!inode->i_private) |
862 | goto skip_search; | |
863 | ||
e9dbfae5 SR |
864 | /* Make sure the system still exists */ |
865 | mutex_lock(&event_mutex); | |
866 | list_for_each_entry(system, &event_subsystems, list) { | |
867 | if (system == inode->i_private) { | |
868 | /* Don't open systems with no events */ | |
869 | if (!system->nr_events) { | |
870 | system = NULL; | |
871 | break; | |
872 | } | |
873 | __get_system(system); | |
874 | break; | |
875 | } | |
876 | } | |
877 | mutex_unlock(&event_mutex); | |
878 | ||
879 | if (system != inode->i_private) | |
880 | return -ENODEV; | |
881 | ||
40ee4dff | 882 | skip_search: |
e9dbfae5 | 883 | ret = tracing_open_generic(inode, filp); |
40ee4dff | 884 | if (ret < 0 && system) |
e9dbfae5 SR |
885 | put_system(system); |
886 | ||
887 | return ret; | |
888 | } | |
889 | ||
890 | static int subsystem_release(struct inode *inode, struct file *file) | |
891 | { | |
892 | struct event_subsystem *system = inode->i_private; | |
893 | ||
40ee4dff SR |
894 | if (system) |
895 | put_system(system); | |
e9dbfae5 SR |
896 | |
897 | return 0; | |
898 | } | |
899 | ||
cfb180f3 TZ |
900 | static ssize_t |
901 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
902 | loff_t *ppos) | |
903 | { | |
904 | struct event_subsystem *system = filp->private_data; | |
905 | struct trace_seq *s; | |
906 | int r; | |
907 | ||
908 | if (*ppos) | |
909 | return 0; | |
910 | ||
911 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
912 | if (!s) | |
913 | return -ENOMEM; | |
914 | ||
915 | trace_seq_init(s); | |
916 | ||
8b372562 | 917 | print_subsystem_event_filter(system, s); |
4bda2d51 | 918 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
919 | |
920 | kfree(s); | |
921 | ||
922 | return r; | |
923 | } | |
924 | ||
925 | static ssize_t | |
926 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
927 | loff_t *ppos) | |
928 | { | |
929 | struct event_subsystem *system = filp->private_data; | |
8b372562 | 930 | char *buf; |
cfb180f3 TZ |
931 | int err; |
932 | ||
8b372562 | 933 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
934 | return -EINVAL; |
935 | ||
8b372562 TZ |
936 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
937 | if (!buf) | |
cfb180f3 TZ |
938 | return -ENOMEM; |
939 | ||
8b372562 TZ |
940 | if (copy_from_user(buf, ubuf, cnt)) { |
941 | free_page((unsigned long) buf); | |
942 | return -EFAULT; | |
cfb180f3 | 943 | } |
8b372562 | 944 | buf[cnt] = '\0'; |
cfb180f3 | 945 | |
8b372562 TZ |
946 | err = apply_subsystem_event_filter(system, buf); |
947 | free_page((unsigned long) buf); | |
948 | if (err < 0) | |
44e9c8b7 | 949 | return err; |
cfb180f3 TZ |
950 | |
951 | *ppos += cnt; | |
952 | ||
953 | return cnt; | |
954 | } | |
955 | ||
d1b182a8 SR |
956 | static ssize_t |
957 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
958 | { | |
959 | int (*func)(struct trace_seq *s) = filp->private_data; | |
960 | struct trace_seq *s; | |
961 | int r; | |
962 | ||
963 | if (*ppos) | |
964 | return 0; | |
965 | ||
966 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
967 | if (!s) | |
968 | return -ENOMEM; | |
969 | ||
970 | trace_seq_init(s); | |
971 | ||
972 | func(s); | |
973 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
974 | ||
975 | kfree(s); | |
976 | ||
977 | return r; | |
978 | } | |
979 | ||
b77e38aa SR |
980 | static const struct seq_operations show_event_seq_ops = { |
981 | .start = t_start, | |
982 | .next = t_next, | |
983 | .show = t_show, | |
984 | .stop = t_stop, | |
985 | }; | |
986 | ||
987 | static const struct seq_operations show_set_event_seq_ops = { | |
988 | .start = s_start, | |
989 | .next = s_next, | |
990 | .show = t_show, | |
991 | .stop = t_stop, | |
992 | }; | |
993 | ||
2314c4ae SR |
994 | static const struct file_operations ftrace_avail_fops = { |
995 | .open = ftrace_event_seq_open, | |
996 | .read = seq_read, | |
997 | .llseek = seq_lseek, | |
998 | .release = seq_release, | |
999 | }; | |
1000 | ||
b77e38aa SR |
1001 | static const struct file_operations ftrace_set_event_fops = { |
1002 | .open = ftrace_event_seq_open, | |
1003 | .read = seq_read, | |
1004 | .write = ftrace_event_write, | |
1005 | .llseek = seq_lseek, | |
1006 | .release = seq_release, | |
1007 | }; | |
1008 | ||
1473e441 SR |
1009 | static const struct file_operations ftrace_enable_fops = { |
1010 | .open = tracing_open_generic, | |
1011 | .read = event_enable_read, | |
1012 | .write = event_enable_write, | |
6038f373 | 1013 | .llseek = default_llseek, |
1473e441 SR |
1014 | }; |
1015 | ||
981d081e | 1016 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
1017 | .open = trace_format_open, |
1018 | .read = seq_read, | |
1019 | .llseek = seq_lseek, | |
1020 | .release = seq_release, | |
981d081e SR |
1021 | }; |
1022 | ||
23725aee PZ |
1023 | static const struct file_operations ftrace_event_id_fops = { |
1024 | .open = tracing_open_generic, | |
1025 | .read = event_id_read, | |
6038f373 | 1026 | .llseek = default_llseek, |
23725aee PZ |
1027 | }; |
1028 | ||
7ce7e424 TZ |
1029 | static const struct file_operations ftrace_event_filter_fops = { |
1030 | .open = tracing_open_generic, | |
1031 | .read = event_filter_read, | |
1032 | .write = event_filter_write, | |
6038f373 | 1033 | .llseek = default_llseek, |
7ce7e424 TZ |
1034 | }; |
1035 | ||
cfb180f3 | 1036 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 1037 | .open = subsystem_open, |
cfb180f3 TZ |
1038 | .read = subsystem_filter_read, |
1039 | .write = subsystem_filter_write, | |
6038f373 | 1040 | .llseek = default_llseek, |
e9dbfae5 | 1041 | .release = subsystem_release, |
cfb180f3 TZ |
1042 | }; |
1043 | ||
8ae79a13 | 1044 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 1045 | .open = subsystem_open, |
8ae79a13 SR |
1046 | .read = system_enable_read, |
1047 | .write = system_enable_write, | |
6038f373 | 1048 | .llseek = default_llseek, |
40ee4dff | 1049 | .release = subsystem_release, |
8ae79a13 SR |
1050 | }; |
1051 | ||
d1b182a8 SR |
1052 | static const struct file_operations ftrace_show_header_fops = { |
1053 | .open = tracing_open_generic, | |
1054 | .read = show_header, | |
6038f373 | 1055 | .llseek = default_llseek, |
d1b182a8 SR |
1056 | }; |
1057 | ||
1473e441 SR |
1058 | static struct dentry *event_trace_events_dir(void) |
1059 | { | |
1060 | static struct dentry *d_tracer; | |
1061 | static struct dentry *d_events; | |
1062 | ||
1063 | if (d_events) | |
1064 | return d_events; | |
1065 | ||
1066 | d_tracer = tracing_init_dentry(); | |
1067 | if (!d_tracer) | |
1068 | return NULL; | |
1069 | ||
1070 | d_events = debugfs_create_dir("events", d_tracer); | |
1071 | if (!d_events) | |
1072 | pr_warning("Could not create debugfs " | |
1073 | "'events' directory\n"); | |
1074 | ||
1075 | return d_events; | |
1076 | } | |
1077 | ||
6ecc2d1c SR |
1078 | static struct dentry * |
1079 | event_subsystem_dir(const char *name, struct dentry *d_events) | |
1080 | { | |
1081 | struct event_subsystem *system; | |
e1112b4d | 1082 | struct dentry *entry; |
6ecc2d1c SR |
1083 | |
1084 | /* First see if we did not already create this dir */ | |
1085 | list_for_each_entry(system, &event_subsystems, list) { | |
dc82ec98 XG |
1086 | if (strcmp(system->name, name) == 0) { |
1087 | system->nr_events++; | |
6ecc2d1c | 1088 | return system->entry; |
dc82ec98 | 1089 | } |
6ecc2d1c SR |
1090 | } |
1091 | ||
1092 | /* need to create new entry */ | |
1093 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1094 | if (!system) { | |
1095 | pr_warning("No memory to create event subsystem %s\n", | |
1096 | name); | |
1097 | return d_events; | |
1098 | } | |
1099 | ||
1100 | system->entry = debugfs_create_dir(name, d_events); | |
1101 | if (!system->entry) { | |
1102 | pr_warning("Could not create event subsystem %s\n", | |
1103 | name); | |
1104 | kfree(system); | |
1105 | return d_events; | |
1106 | } | |
1107 | ||
dc82ec98 | 1108 | system->nr_events = 1; |
e9dbfae5 | 1109 | system->ref_count = 1; |
6d723736 SR |
1110 | system->name = kstrdup(name, GFP_KERNEL); |
1111 | if (!system->name) { | |
1112 | debugfs_remove(system->entry); | |
1113 | kfree(system); | |
1114 | return d_events; | |
1115 | } | |
1116 | ||
6ecc2d1c SR |
1117 | list_add(&system->list, &event_subsystems); |
1118 | ||
30e673b2 | 1119 | system->filter = NULL; |
cfb180f3 | 1120 | |
8b372562 TZ |
1121 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
1122 | if (!system->filter) { | |
1123 | pr_warning("Could not allocate filter for subsystem " | |
1124 | "'%s'\n", name); | |
1125 | return system->entry; | |
1126 | } | |
1127 | ||
e1112b4d TZ |
1128 | entry = debugfs_create_file("filter", 0644, system->entry, system, |
1129 | &ftrace_subsystem_filter_fops); | |
8b372562 TZ |
1130 | if (!entry) { |
1131 | kfree(system->filter); | |
1132 | system->filter = NULL; | |
e1112b4d TZ |
1133 | pr_warning("Could not create debugfs " |
1134 | "'%s/filter' entry\n", name); | |
8b372562 | 1135 | } |
e1112b4d | 1136 | |
40ee4dff | 1137 | trace_create_file("enable", 0644, system->entry, system, |
f3f3f009 | 1138 | &ftrace_system_enable_fops); |
8ae79a13 | 1139 | |
6ecc2d1c SR |
1140 | return system->entry; |
1141 | } | |
1142 | ||
1473e441 | 1143 | static int |
701970b3 SR |
1144 | event_create_dir(struct ftrace_event_call *call, struct dentry *d_events, |
1145 | const struct file_operations *id, | |
1146 | const struct file_operations *enable, | |
1147 | const struct file_operations *filter, | |
1148 | const struct file_operations *format) | |
1473e441 | 1149 | { |
2e33af02 | 1150 | struct list_head *head; |
fd994989 | 1151 | int ret; |
1473e441 | 1152 | |
6ecc2d1c SR |
1153 | /* |
1154 | * If the trace point header did not define TRACE_SYSTEM | |
1155 | * then the system would be called "TRACE_SYSTEM". | |
1156 | */ | |
8f082018 SR |
1157 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
1158 | d_events = event_subsystem_dir(call->class->system, d_events); | |
6ecc2d1c | 1159 | |
1473e441 SR |
1160 | call->dir = debugfs_create_dir(call->name, d_events); |
1161 | if (!call->dir) { | |
1162 | pr_warning("Could not create debugfs " | |
1163 | "'%s' directory\n", call->name); | |
1164 | return -1; | |
1165 | } | |
1166 | ||
a1d0ce82 | 1167 | if (call->class->reg) |
f3f3f009 FW |
1168 | trace_create_file("enable", 0644, call->dir, call, |
1169 | enable); | |
1473e441 | 1170 | |
2239291a | 1171 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 1172 | if (call->event.type && call->class->reg) |
f3f3f009 FW |
1173 | trace_create_file("id", 0444, call->dir, call, |
1174 | id); | |
2239291a | 1175 | #endif |
23725aee | 1176 | |
c9d932cf LZ |
1177 | /* |
1178 | * Other events may have the same class. Only update | |
1179 | * the fields if they are not already defined. | |
1180 | */ | |
1181 | head = trace_get_fields(call); | |
1182 | if (list_empty(head)) { | |
1183 | ret = call->class->define_fields(call); | |
1184 | if (ret < 0) { | |
1185 | pr_warning("Could not initialize trace point" | |
1186 | " events/%s\n", call->name); | |
1187 | return ret; | |
cf027f64 TZ |
1188 | } |
1189 | } | |
c9d932cf LZ |
1190 | trace_create_file("filter", 0644, call->dir, call, |
1191 | filter); | |
cf027f64 | 1192 | |
f3f3f009 FW |
1193 | trace_create_file("format", 0444, call->dir, call, |
1194 | format); | |
6d723736 SR |
1195 | |
1196 | return 0; | |
1197 | } | |
1198 | ||
67ead0a6 LZ |
1199 | static int |
1200 | __trace_add_event_call(struct ftrace_event_call *call, struct module *mod, | |
1201 | const struct file_operations *id, | |
1202 | const struct file_operations *enable, | |
1203 | const struct file_operations *filter, | |
1204 | const struct file_operations *format) | |
bd1a5c84 MH |
1205 | { |
1206 | struct dentry *d_events; | |
1207 | int ret; | |
6d723736 | 1208 | |
67ead0a6 | 1209 | /* The linker may leave blanks */ |
bd1a5c84 MH |
1210 | if (!call->name) |
1211 | return -EINVAL; | |
701970b3 | 1212 | |
0405ab80 SR |
1213 | if (call->class->raw_init) { |
1214 | ret = call->class->raw_init(call); | |
bd1a5c84 MH |
1215 | if (ret < 0) { |
1216 | if (ret != -ENOSYS) | |
67ead0a6 LZ |
1217 | pr_warning("Could not initialize trace events/%s\n", |
1218 | call->name); | |
bd1a5c84 MH |
1219 | return ret; |
1220 | } | |
1221 | } | |
701970b3 | 1222 | |
bd1a5c84 MH |
1223 | d_events = event_trace_events_dir(); |
1224 | if (!d_events) | |
1225 | return -ENOENT; | |
1226 | ||
67ead0a6 | 1227 | ret = event_create_dir(call, d_events, id, enable, filter, format); |
88f70d75 MH |
1228 | if (!ret) |
1229 | list_add(&call->list, &ftrace_events); | |
67ead0a6 | 1230 | call->mod = mod; |
88f70d75 | 1231 | |
588bebb7 | 1232 | return ret; |
bd1a5c84 MH |
1233 | } |
1234 | ||
1235 | /* Add an additional event_call dynamically */ | |
1236 | int trace_add_event_call(struct ftrace_event_call *call) | |
1237 | { | |
1238 | int ret; | |
1239 | mutex_lock(&event_mutex); | |
67ead0a6 LZ |
1240 | ret = __trace_add_event_call(call, NULL, &ftrace_event_id_fops, |
1241 | &ftrace_enable_fops, | |
1242 | &ftrace_event_filter_fops, | |
1243 | &ftrace_event_format_fops); | |
bd1a5c84 MH |
1244 | mutex_unlock(&event_mutex); |
1245 | return ret; | |
1246 | } | |
701970b3 | 1247 | |
a2ca5e03 FW |
1248 | static void remove_subsystem_dir(const char *name) |
1249 | { | |
1250 | struct event_subsystem *system; | |
1251 | ||
1252 | if (strcmp(name, TRACE_SYSTEM) == 0) | |
1253 | return; | |
1254 | ||
1255 | list_for_each_entry(system, &event_subsystems, list) { | |
1256 | if (strcmp(system->name, name) == 0) { | |
1257 | if (!--system->nr_events) { | |
a2ca5e03 FW |
1258 | debugfs_remove_recursive(system->entry); |
1259 | list_del(&system->list); | |
e9dbfae5 | 1260 | __put_system(system); |
a2ca5e03 FW |
1261 | } |
1262 | break; | |
1263 | } | |
1264 | } | |
1265 | } | |
1266 | ||
4fead8e4 MH |
1267 | /* |
1268 | * Must be called under locking both of event_mutex and trace_event_mutex. | |
1269 | */ | |
bd1a5c84 MH |
1270 | static void __trace_remove_event_call(struct ftrace_event_call *call) |
1271 | { | |
1272 | ftrace_event_enable_disable(call, 0); | |
80decc70 SR |
1273 | if (call->event.funcs) |
1274 | __unregister_ftrace_event(&call->event); | |
bd1a5c84 MH |
1275 | debugfs_remove_recursive(call->dir); |
1276 | list_del(&call->list); | |
1277 | trace_destroy_fields(call); | |
1278 | destroy_preds(call); | |
8f082018 | 1279 | remove_subsystem_dir(call->class->system); |
bd1a5c84 MH |
1280 | } |
1281 | ||
1282 | /* Remove an event_call */ | |
1283 | void trace_remove_event_call(struct ftrace_event_call *call) | |
1284 | { | |
1285 | mutex_lock(&event_mutex); | |
4fead8e4 | 1286 | down_write(&trace_event_mutex); |
bd1a5c84 | 1287 | __trace_remove_event_call(call); |
4fead8e4 | 1288 | up_write(&trace_event_mutex); |
bd1a5c84 MH |
1289 | mutex_unlock(&event_mutex); |
1290 | } | |
1291 | ||
1292 | #define for_each_event(event, start, end) \ | |
1293 | for (event = start; \ | |
1294 | (unsigned long)event < (unsigned long)end; \ | |
1295 | event++) | |
1296 | ||
1297 | #ifdef CONFIG_MODULES | |
1298 | ||
1299 | static LIST_HEAD(ftrace_module_file_list); | |
1300 | ||
1301 | /* | |
1302 | * Modules must own their file_operations to keep up with | |
1303 | * reference counting. | |
1304 | */ | |
1305 | struct ftrace_module_file_ops { | |
1306 | struct list_head list; | |
1307 | struct module *mod; | |
1308 | struct file_operations id; | |
1309 | struct file_operations enable; | |
1310 | struct file_operations format; | |
1311 | struct file_operations filter; | |
1312 | }; | |
1313 | ||
701970b3 SR |
1314 | static struct ftrace_module_file_ops * |
1315 | trace_create_file_ops(struct module *mod) | |
1316 | { | |
1317 | struct ftrace_module_file_ops *file_ops; | |
1318 | ||
1319 | /* | |
1320 | * This is a bit of a PITA. To allow for correct reference | |
1321 | * counting, modules must "own" their file_operations. | |
1322 | * To do this, we allocate the file operations that will be | |
1323 | * used in the event directory. | |
1324 | */ | |
1325 | ||
1326 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1327 | if (!file_ops) | |
1328 | return NULL; | |
1329 | ||
1330 | file_ops->mod = mod; | |
1331 | ||
1332 | file_ops->id = ftrace_event_id_fops; | |
1333 | file_ops->id.owner = mod; | |
1334 | ||
1335 | file_ops->enable = ftrace_enable_fops; | |
1336 | file_ops->enable.owner = mod; | |
1337 | ||
1338 | file_ops->filter = ftrace_event_filter_fops; | |
1339 | file_ops->filter.owner = mod; | |
1340 | ||
1341 | file_ops->format = ftrace_event_format_fops; | |
1342 | file_ops->format.owner = mod; | |
1343 | ||
1344 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1345 | ||
1346 | return file_ops; | |
1347 | } | |
1348 | ||
6d723736 SR |
1349 | static void trace_module_add_events(struct module *mod) |
1350 | { | |
701970b3 | 1351 | struct ftrace_module_file_ops *file_ops = NULL; |
e4a9ea5e | 1352 | struct ftrace_event_call **call, **start, **end; |
6d723736 SR |
1353 | |
1354 | start = mod->trace_events; | |
1355 | end = mod->trace_events + mod->num_trace_events; | |
1356 | ||
1357 | if (start == end) | |
1358 | return; | |
1359 | ||
67ead0a6 LZ |
1360 | file_ops = trace_create_file_ops(mod); |
1361 | if (!file_ops) | |
6d723736 SR |
1362 | return; |
1363 | ||
1364 | for_each_event(call, start, end) { | |
e4a9ea5e | 1365 | __trace_add_event_call(*call, mod, |
88f70d75 MH |
1366 | &file_ops->id, &file_ops->enable, |
1367 | &file_ops->filter, &file_ops->format); | |
6d723736 SR |
1368 | } |
1369 | } | |
1370 | ||
1371 | static void trace_module_remove_events(struct module *mod) | |
1372 | { | |
701970b3 | 1373 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1374 | struct ftrace_event_call *call, *p; |
9456f0fa | 1375 | bool found = false; |
6d723736 | 1376 | |
110bf2b7 | 1377 | down_write(&trace_event_mutex); |
6d723736 SR |
1378 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1379 | if (call->mod == mod) { | |
9456f0fa | 1380 | found = true; |
bd1a5c84 | 1381 | __trace_remove_event_call(call); |
6d723736 SR |
1382 | } |
1383 | } | |
701970b3 SR |
1384 | |
1385 | /* Now free the file_operations */ | |
1386 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1387 | if (file_ops->mod == mod) | |
1388 | break; | |
1389 | } | |
1390 | if (&file_ops->list != &ftrace_module_file_list) { | |
1391 | list_del(&file_ops->list); | |
1392 | kfree(file_ops); | |
1393 | } | |
9456f0fa SR |
1394 | |
1395 | /* | |
1396 | * It is safest to reset the ring buffer if the module being unloaded | |
1397 | * registered any events. | |
1398 | */ | |
1399 | if (found) | |
1400 | tracing_reset_current_online_cpus(); | |
110bf2b7 | 1401 | up_write(&trace_event_mutex); |
6d723736 SR |
1402 | } |
1403 | ||
61f919a1 SR |
1404 | static int trace_module_notify(struct notifier_block *self, |
1405 | unsigned long val, void *data) | |
6d723736 SR |
1406 | { |
1407 | struct module *mod = data; | |
1408 | ||
1409 | mutex_lock(&event_mutex); | |
1410 | switch (val) { | |
1411 | case MODULE_STATE_COMING: | |
1412 | trace_module_add_events(mod); | |
1413 | break; | |
1414 | case MODULE_STATE_GOING: | |
1415 | trace_module_remove_events(mod); | |
1416 | break; | |
1417 | } | |
1418 | mutex_unlock(&event_mutex); | |
fd994989 | 1419 | |
1473e441 SR |
1420 | return 0; |
1421 | } | |
61f919a1 SR |
1422 | #else |
1423 | static int trace_module_notify(struct notifier_block *self, | |
1424 | unsigned long val, void *data) | |
1425 | { | |
1426 | return 0; | |
1427 | } | |
1428 | #endif /* CONFIG_MODULES */ | |
1473e441 | 1429 | |
ec827c7e | 1430 | static struct notifier_block trace_module_nb = { |
6d723736 SR |
1431 | .notifier_call = trace_module_notify, |
1432 | .priority = 0, | |
1433 | }; | |
1434 | ||
e4a9ea5e SR |
1435 | extern struct ftrace_event_call *__start_ftrace_events[]; |
1436 | extern struct ftrace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 1437 | |
020e5f85 LZ |
1438 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
1439 | ||
1440 | static __init int setup_trace_event(char *str) | |
1441 | { | |
1442 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
1443 | ring_buffer_expanded = 1; | |
1444 | tracing_selftest_disabled = 1; | |
1445 | ||
1446 | return 1; | |
1447 | } | |
1448 | __setup("trace_event=", setup_trace_event); | |
1449 | ||
b77e38aa SR |
1450 | static __init int event_trace_init(void) |
1451 | { | |
e4a9ea5e | 1452 | struct ftrace_event_call **call; |
b77e38aa SR |
1453 | struct dentry *d_tracer; |
1454 | struct dentry *entry; | |
1473e441 | 1455 | struct dentry *d_events; |
6d723736 | 1456 | int ret; |
020e5f85 LZ |
1457 | char *buf = bootup_event_buf; |
1458 | char *token; | |
b77e38aa SR |
1459 | |
1460 | d_tracer = tracing_init_dentry(); | |
1461 | if (!d_tracer) | |
1462 | return 0; | |
1463 | ||
2314c4ae SR |
1464 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
1465 | (void *)&show_event_seq_ops, | |
1466 | &ftrace_avail_fops); | |
1467 | if (!entry) | |
1468 | pr_warning("Could not create debugfs " | |
1469 | "'available_events' entry\n"); | |
1470 | ||
b77e38aa SR |
1471 | entry = debugfs_create_file("set_event", 0644, d_tracer, |
1472 | (void *)&show_set_event_seq_ops, | |
1473 | &ftrace_set_event_fops); | |
1474 | if (!entry) | |
1475 | pr_warning("Could not create debugfs " | |
1476 | "'set_event' entry\n"); | |
1477 | ||
1473e441 SR |
1478 | d_events = event_trace_events_dir(); |
1479 | if (!d_events) | |
1480 | return 0; | |
1481 | ||
d1b182a8 SR |
1482 | /* ring buffer internal formats */ |
1483 | trace_create_file("header_page", 0444, d_events, | |
1484 | ring_buffer_print_page_header, | |
1485 | &ftrace_show_header_fops); | |
1486 | ||
1487 | trace_create_file("header_event", 0444, d_events, | |
1488 | ring_buffer_print_entry_header, | |
1489 | &ftrace_show_header_fops); | |
1490 | ||
8ae79a13 | 1491 | trace_create_file("enable", 0644, d_events, |
8f31bfe5 | 1492 | NULL, &ftrace_system_enable_fops); |
8ae79a13 | 1493 | |
8728fe50 LZ |
1494 | if (trace_define_common_fields()) |
1495 | pr_warning("tracing: Failed to allocate common fields"); | |
1496 | ||
6d723736 | 1497 | for_each_event(call, __start_ftrace_events, __stop_ftrace_events) { |
e4a9ea5e | 1498 | __trace_add_event_call(*call, NULL, &ftrace_event_id_fops, |
88f70d75 MH |
1499 | &ftrace_enable_fops, |
1500 | &ftrace_event_filter_fops, | |
1501 | &ftrace_event_format_fops); | |
1473e441 SR |
1502 | } |
1503 | ||
020e5f85 LZ |
1504 | while (true) { |
1505 | token = strsep(&buf, ","); | |
1506 | ||
1507 | if (!token) | |
1508 | break; | |
1509 | if (!*token) | |
1510 | continue; | |
1511 | ||
1512 | ret = ftrace_set_clr_event(token, 1); | |
1513 | if (ret) | |
1514 | pr_warning("Failed to enable trace event: %s\n", token); | |
1515 | } | |
1516 | ||
6d723736 | 1517 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 1518 | if (ret) |
6d723736 SR |
1519 | pr_warning("Failed to register trace events module notifier\n"); |
1520 | ||
b77e38aa SR |
1521 | return 0; |
1522 | } | |
1523 | fs_initcall(event_trace_init); | |
e6187007 SR |
1524 | |
1525 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1526 | ||
1527 | static DEFINE_SPINLOCK(test_spinlock); | |
1528 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
1529 | static DEFINE_MUTEX(test_mutex); | |
1530 | ||
1531 | static __init void test_work(struct work_struct *dummy) | |
1532 | { | |
1533 | spin_lock(&test_spinlock); | |
1534 | spin_lock_irq(&test_spinlock_irq); | |
1535 | udelay(1); | |
1536 | spin_unlock_irq(&test_spinlock_irq); | |
1537 | spin_unlock(&test_spinlock); | |
1538 | ||
1539 | mutex_lock(&test_mutex); | |
1540 | msleep(1); | |
1541 | mutex_unlock(&test_mutex); | |
1542 | } | |
1543 | ||
1544 | static __init int event_test_thread(void *unused) | |
1545 | { | |
1546 | void *test_malloc; | |
1547 | ||
1548 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
1549 | if (!test_malloc) | |
1550 | pr_info("failed to kmalloc\n"); | |
1551 | ||
1552 | schedule_on_each_cpu(test_work); | |
1553 | ||
1554 | kfree(test_malloc); | |
1555 | ||
1556 | set_current_state(TASK_INTERRUPTIBLE); | |
1557 | while (!kthread_should_stop()) | |
1558 | schedule(); | |
1559 | ||
1560 | return 0; | |
1561 | } | |
1562 | ||
1563 | /* | |
1564 | * Do various things that may trigger events. | |
1565 | */ | |
1566 | static __init void event_test_stuff(void) | |
1567 | { | |
1568 | struct task_struct *test_thread; | |
1569 | ||
1570 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
1571 | msleep(1); | |
1572 | kthread_stop(test_thread); | |
1573 | } | |
1574 | ||
1575 | /* | |
1576 | * For every trace event defined, we will test each trace point separately, | |
1577 | * and then by groups, and finally all trace points. | |
1578 | */ | |
9ea21c1e | 1579 | static __init void event_trace_self_tests(void) |
e6187007 SR |
1580 | { |
1581 | struct ftrace_event_call *call; | |
1582 | struct event_subsystem *system; | |
e6187007 SR |
1583 | int ret; |
1584 | ||
1585 | pr_info("Running tests on trace events:\n"); | |
1586 | ||
1587 | list_for_each_entry(call, &ftrace_events, list) { | |
1588 | ||
2239291a SR |
1589 | /* Only test those that have a probe */ |
1590 | if (!call->class || !call->class->probe) | |
e6187007 SR |
1591 | continue; |
1592 | ||
1f5a6b45 SR |
1593 | /* |
1594 | * Testing syscall events here is pretty useless, but | |
1595 | * we still do it if configured. But this is time consuming. | |
1596 | * What we really need is a user thread to perform the | |
1597 | * syscalls as we test. | |
1598 | */ | |
1599 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
1600 | if (call->class->system && |
1601 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
1602 | continue; |
1603 | #endif | |
1604 | ||
e6187007 SR |
1605 | pr_info("Testing event %s: ", call->name); |
1606 | ||
1607 | /* | |
1608 | * If an event is already enabled, someone is using | |
1609 | * it and the self test should not be on. | |
1610 | */ | |
553552ce | 1611 | if (call->flags & TRACE_EVENT_FL_ENABLED) { |
e6187007 SR |
1612 | pr_warning("Enabled event during self test!\n"); |
1613 | WARN_ON_ONCE(1); | |
1614 | continue; | |
1615 | } | |
1616 | ||
0e907c99 | 1617 | ftrace_event_enable_disable(call, 1); |
e6187007 | 1618 | event_test_stuff(); |
0e907c99 | 1619 | ftrace_event_enable_disable(call, 0); |
e6187007 SR |
1620 | |
1621 | pr_cont("OK\n"); | |
1622 | } | |
1623 | ||
1624 | /* Now test at the sub system level */ | |
1625 | ||
1626 | pr_info("Running tests on trace event systems:\n"); | |
1627 | ||
1628 | list_for_each_entry(system, &event_subsystems, list) { | |
1629 | ||
1630 | /* the ftrace system is special, skip it */ | |
1631 | if (strcmp(system->name, "ftrace") == 0) | |
1632 | continue; | |
1633 | ||
1634 | pr_info("Testing event system %s: ", system->name); | |
1635 | ||
8f31bfe5 | 1636 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1); |
e6187007 SR |
1637 | if (WARN_ON_ONCE(ret)) { |
1638 | pr_warning("error enabling system %s\n", | |
1639 | system->name); | |
1640 | continue; | |
1641 | } | |
1642 | ||
1643 | event_test_stuff(); | |
1644 | ||
8f31bfe5 | 1645 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0); |
e6187007 SR |
1646 | if (WARN_ON_ONCE(ret)) |
1647 | pr_warning("error disabling system %s\n", | |
1648 | system->name); | |
1649 | ||
1650 | pr_cont("OK\n"); | |
1651 | } | |
1652 | ||
1653 | /* Test with all events enabled */ | |
1654 | ||
1655 | pr_info("Running tests on all trace events:\n"); | |
1656 | pr_info("Testing all events: "); | |
1657 | ||
8f31bfe5 | 1658 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1); |
e6187007 | 1659 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 1660 | pr_warning("error enabling all events\n"); |
9ea21c1e | 1661 | return; |
e6187007 SR |
1662 | } |
1663 | ||
1664 | event_test_stuff(); | |
1665 | ||
1666 | /* reset sysname */ | |
8f31bfe5 | 1667 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0); |
e6187007 SR |
1668 | if (WARN_ON_ONCE(ret)) { |
1669 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 1670 | return; |
e6187007 SR |
1671 | } |
1672 | ||
1673 | pr_cont("OK\n"); | |
9ea21c1e SR |
1674 | } |
1675 | ||
1676 | #ifdef CONFIG_FUNCTION_TRACER | |
1677 | ||
245b2e70 | 1678 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e SR |
1679 | |
1680 | static void | |
1681 | function_test_events_call(unsigned long ip, unsigned long parent_ip) | |
1682 | { | |
1683 | struct ring_buffer_event *event; | |
e77405ad | 1684 | struct ring_buffer *buffer; |
9ea21c1e SR |
1685 | struct ftrace_entry *entry; |
1686 | unsigned long flags; | |
1687 | long disabled; | |
9ea21c1e SR |
1688 | int cpu; |
1689 | int pc; | |
1690 | ||
1691 | pc = preempt_count(); | |
5168ae50 | 1692 | preempt_disable_notrace(); |
9ea21c1e | 1693 | cpu = raw_smp_processor_id(); |
245b2e70 | 1694 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
1695 | |
1696 | if (disabled != 1) | |
1697 | goto out; | |
1698 | ||
1699 | local_save_flags(flags); | |
1700 | ||
e77405ad SR |
1701 | event = trace_current_buffer_lock_reserve(&buffer, |
1702 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
1703 | flags, pc); |
1704 | if (!event) | |
1705 | goto out; | |
1706 | entry = ring_buffer_event_data(event); | |
1707 | entry->ip = ip; | |
1708 | entry->parent_ip = parent_ip; | |
1709 | ||
e77405ad | 1710 | trace_nowake_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
1711 | |
1712 | out: | |
245b2e70 | 1713 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 1714 | preempt_enable_notrace(); |
9ea21c1e SR |
1715 | } |
1716 | ||
1717 | static struct ftrace_ops trace_ops __initdata = | |
1718 | { | |
1719 | .func = function_test_events_call, | |
1720 | }; | |
1721 | ||
1722 | static __init void event_trace_self_test_with_function(void) | |
1723 | { | |
17bb615a SR |
1724 | int ret; |
1725 | ret = register_ftrace_function(&trace_ops); | |
1726 | if (WARN_ON(ret < 0)) { | |
1727 | pr_info("Failed to enable function tracer for event tests\n"); | |
1728 | return; | |
1729 | } | |
9ea21c1e SR |
1730 | pr_info("Running tests again, along with the function tracer\n"); |
1731 | event_trace_self_tests(); | |
1732 | unregister_ftrace_function(&trace_ops); | |
1733 | } | |
1734 | #else | |
1735 | static __init void event_trace_self_test_with_function(void) | |
1736 | { | |
1737 | } | |
1738 | #endif | |
1739 | ||
1740 | static __init int event_trace_self_tests_init(void) | |
1741 | { | |
020e5f85 LZ |
1742 | if (!tracing_selftest_disabled) { |
1743 | event_trace_self_tests(); | |
1744 | event_trace_self_test_with_function(); | |
1745 | } | |
e6187007 SR |
1746 | |
1747 | return 0; | |
1748 | } | |
1749 | ||
28d20e2d | 1750 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
1751 | |
1752 | #endif |