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); | |
e647d6b3 LZ |
119 | |
120 | return ret; | |
121 | } | |
122 | ||
bd1a5c84 | 123 | void trace_destroy_fields(struct ftrace_event_call *call) |
2df75e41 LZ |
124 | { |
125 | struct ftrace_event_field *field, *next; | |
2e33af02 | 126 | struct list_head *head; |
2df75e41 | 127 | |
2e33af02 SR |
128 | head = trace_get_fields(call); |
129 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 LZ |
130 | list_del(&field->link); |
131 | kfree(field->type); | |
132 | kfree(field->name); | |
133 | kfree(field); | |
134 | } | |
135 | } | |
136 | ||
87d9b4e1 LZ |
137 | int trace_event_raw_init(struct ftrace_event_call *call) |
138 | { | |
139 | int id; | |
140 | ||
80decc70 | 141 | id = register_ftrace_event(&call->event); |
87d9b4e1 LZ |
142 | if (!id) |
143 | return -ENODEV; | |
87d9b4e1 LZ |
144 | |
145 | return 0; | |
146 | } | |
147 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
148 | ||
ceec0b6f JO |
149 | int ftrace_event_reg(struct ftrace_event_call *call, |
150 | enum trace_reg type, void *data) | |
a1d0ce82 SR |
151 | { |
152 | switch (type) { | |
153 | case TRACE_REG_REGISTER: | |
154 | return tracepoint_probe_register(call->name, | |
155 | call->class->probe, | |
156 | call); | |
157 | case TRACE_REG_UNREGISTER: | |
158 | tracepoint_probe_unregister(call->name, | |
159 | call->class->probe, | |
160 | call); | |
161 | return 0; | |
162 | ||
163 | #ifdef CONFIG_PERF_EVENTS | |
164 | case TRACE_REG_PERF_REGISTER: | |
165 | return tracepoint_probe_register(call->name, | |
166 | call->class->perf_probe, | |
167 | call); | |
168 | case TRACE_REG_PERF_UNREGISTER: | |
169 | tracepoint_probe_unregister(call->name, | |
170 | call->class->perf_probe, | |
171 | call); | |
172 | return 0; | |
ceec0b6f JO |
173 | case TRACE_REG_PERF_OPEN: |
174 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
175 | case TRACE_REG_PERF_ADD: |
176 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 177 | return 0; |
a1d0ce82 SR |
178 | #endif |
179 | } | |
180 | return 0; | |
181 | } | |
182 | EXPORT_SYMBOL_GPL(ftrace_event_reg); | |
183 | ||
e870e9a1 LZ |
184 | void trace_event_enable_cmd_record(bool enable) |
185 | { | |
186 | struct ftrace_event_call *call; | |
187 | ||
188 | mutex_lock(&event_mutex); | |
189 | list_for_each_entry(call, &ftrace_events, list) { | |
190 | if (!(call->flags & TRACE_EVENT_FL_ENABLED)) | |
191 | continue; | |
192 | ||
193 | if (enable) { | |
194 | tracing_start_cmdline_record(); | |
195 | call->flags |= TRACE_EVENT_FL_RECORDED_CMD; | |
196 | } else { | |
197 | tracing_stop_cmdline_record(); | |
198 | call->flags &= ~TRACE_EVENT_FL_RECORDED_CMD; | |
199 | } | |
200 | } | |
201 | mutex_unlock(&event_mutex); | |
202 | } | |
203 | ||
3b8e4273 | 204 | static int ftrace_event_enable_disable(struct ftrace_event_call *call, |
fd994989 SR |
205 | int enable) |
206 | { | |
3b8e4273 LZ |
207 | int ret = 0; |
208 | ||
fd994989 SR |
209 | switch (enable) { |
210 | case 0: | |
553552ce SR |
211 | if (call->flags & TRACE_EVENT_FL_ENABLED) { |
212 | call->flags &= ~TRACE_EVENT_FL_ENABLED; | |
e870e9a1 LZ |
213 | if (call->flags & TRACE_EVENT_FL_RECORDED_CMD) { |
214 | tracing_stop_cmdline_record(); | |
215 | call->flags &= ~TRACE_EVENT_FL_RECORDED_CMD; | |
216 | } | |
ceec0b6f | 217 | call->class->reg(call, TRACE_REG_UNREGISTER, NULL); |
fd994989 | 218 | } |
fd994989 SR |
219 | break; |
220 | case 1: | |
553552ce | 221 | if (!(call->flags & TRACE_EVENT_FL_ENABLED)) { |
e870e9a1 LZ |
222 | if (trace_flags & TRACE_ITER_RECORD_CMD) { |
223 | tracing_start_cmdline_record(); | |
224 | call->flags |= TRACE_EVENT_FL_RECORDED_CMD; | |
225 | } | |
ceec0b6f | 226 | ret = call->class->reg(call, TRACE_REG_REGISTER, NULL); |
3b8e4273 LZ |
227 | if (ret) { |
228 | tracing_stop_cmdline_record(); | |
229 | pr_info("event trace: Could not enable event " | |
230 | "%s\n", call->name); | |
231 | break; | |
232 | } | |
553552ce | 233 | call->flags |= TRACE_EVENT_FL_ENABLED; |
fd994989 | 234 | } |
fd994989 SR |
235 | break; |
236 | } | |
3b8e4273 LZ |
237 | |
238 | return ret; | |
fd994989 SR |
239 | } |
240 | ||
0e907c99 Z |
241 | static void ftrace_clear_events(void) |
242 | { | |
243 | struct ftrace_event_call *call; | |
244 | ||
245 | mutex_lock(&event_mutex); | |
246 | list_for_each_entry(call, &ftrace_events, list) { | |
247 | ftrace_event_enable_disable(call, 0); | |
248 | } | |
249 | mutex_unlock(&event_mutex); | |
250 | } | |
251 | ||
e9dbfae5 SR |
252 | static void __put_system(struct event_subsystem *system) |
253 | { | |
254 | struct event_filter *filter = system->filter; | |
255 | ||
256 | WARN_ON_ONCE(system->ref_count == 0); | |
257 | if (--system->ref_count) | |
258 | return; | |
259 | ||
260 | if (filter) { | |
261 | kfree(filter->filter_string); | |
262 | kfree(filter); | |
263 | } | |
264 | kfree(system->name); | |
265 | kfree(system); | |
266 | } | |
267 | ||
268 | static void __get_system(struct event_subsystem *system) | |
269 | { | |
270 | WARN_ON_ONCE(system->ref_count == 0); | |
271 | system->ref_count++; | |
272 | } | |
273 | ||
274 | static void put_system(struct event_subsystem *system) | |
275 | { | |
276 | mutex_lock(&event_mutex); | |
277 | __put_system(system); | |
278 | mutex_unlock(&event_mutex); | |
279 | } | |
280 | ||
8f31bfe5 LZ |
281 | /* |
282 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
283 | */ | |
284 | static int __ftrace_set_clr_event(const char *match, const char *sub, | |
285 | const char *event, int set) | |
b77e38aa | 286 | { |
a59fd602 | 287 | struct ftrace_event_call *call; |
29f93943 | 288 | int ret = -EINVAL; |
8f31bfe5 LZ |
289 | |
290 | mutex_lock(&event_mutex); | |
291 | list_for_each_entry(call, &ftrace_events, list) { | |
292 | ||
a1d0ce82 | 293 | if (!call->name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
294 | continue; |
295 | ||
9b63776f SR |
296 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
297 | continue; | |
298 | ||
8f31bfe5 LZ |
299 | if (match && |
300 | strcmp(match, call->name) != 0 && | |
8f082018 | 301 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
302 | continue; |
303 | ||
8f082018 | 304 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
305 | continue; |
306 | ||
307 | if (event && strcmp(event, call->name) != 0) | |
308 | continue; | |
309 | ||
310 | ftrace_event_enable_disable(call, set); | |
311 | ||
312 | ret = 0; | |
313 | } | |
314 | mutex_unlock(&event_mutex); | |
315 | ||
316 | return ret; | |
317 | } | |
318 | ||
319 | static int ftrace_set_clr_event(char *buf, int set) | |
320 | { | |
b628b3e6 | 321 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
322 | |
323 | /* | |
324 | * The buf format can be <subsystem>:<event-name> | |
325 | * *:<event-name> means any event by that name. | |
326 | * :<event-name> is the same. | |
327 | * | |
328 | * <subsystem>:* means all events in that subsystem | |
329 | * <subsystem>: means the same. | |
330 | * | |
331 | * <name> (no ':') means all events in a subsystem with | |
332 | * the name <name> or any event that matches <name> | |
333 | */ | |
334 | ||
335 | match = strsep(&buf, ":"); | |
336 | if (buf) { | |
337 | sub = match; | |
338 | event = buf; | |
339 | match = NULL; | |
340 | ||
341 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
342 | sub = NULL; | |
343 | if (!strlen(event) || strcmp(event, "*") == 0) | |
344 | event = NULL; | |
345 | } | |
b77e38aa | 346 | |
8f31bfe5 | 347 | return __ftrace_set_clr_event(match, sub, event, set); |
b77e38aa SR |
348 | } |
349 | ||
4671c794 SR |
350 | /** |
351 | * trace_set_clr_event - enable or disable an event | |
352 | * @system: system name to match (NULL for any system) | |
353 | * @event: event name to match (NULL for all events, within system) | |
354 | * @set: 1 to enable, 0 to disable | |
355 | * | |
356 | * This is a way for other parts of the kernel to enable or disable | |
357 | * event recording. | |
358 | * | |
359 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
360 | * registered events. | |
361 | */ | |
362 | int trace_set_clr_event(const char *system, const char *event, int set) | |
363 | { | |
364 | return __ftrace_set_clr_event(NULL, system, event, set); | |
365 | } | |
56355b83 | 366 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 367 | |
b77e38aa SR |
368 | /* 128 should be much more than enough */ |
369 | #define EVENT_BUF_SIZE 127 | |
370 | ||
371 | static ssize_t | |
372 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
373 | size_t cnt, loff_t *ppos) | |
374 | { | |
48966364 | 375 | struct trace_parser parser; |
4ba7978e | 376 | ssize_t read, ret; |
b77e38aa | 377 | |
4ba7978e | 378 | if (!cnt) |
b77e38aa SR |
379 | return 0; |
380 | ||
1852fcce SR |
381 | ret = tracing_update_buffers(); |
382 | if (ret < 0) | |
383 | return ret; | |
384 | ||
48966364 | 385 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
386 | return -ENOMEM; |
387 | ||
48966364 | 388 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
389 | ||
4ba7978e | 390 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 391 | int set = 1; |
b77e38aa | 392 | |
48966364 | 393 | if (*parser.buffer == '!') |
b77e38aa | 394 | set = 0; |
b77e38aa | 395 | |
48966364 | 396 | parser.buffer[parser.idx] = 0; |
397 | ||
398 | ret = ftrace_set_clr_event(parser.buffer + !set, set); | |
b77e38aa | 399 | if (ret) |
48966364 | 400 | goto out_put; |
b77e38aa | 401 | } |
b77e38aa SR |
402 | |
403 | ret = read; | |
404 | ||
48966364 | 405 | out_put: |
406 | trace_parser_put(&parser); | |
b77e38aa SR |
407 | |
408 | return ret; | |
409 | } | |
410 | ||
411 | static void * | |
412 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
413 | { | |
30bd39cd | 414 | struct ftrace_event_call *call = v; |
b77e38aa SR |
415 | |
416 | (*pos)++; | |
417 | ||
30bd39cd | 418 | list_for_each_entry_continue(call, &ftrace_events, list) { |
40e26815 SR |
419 | /* |
420 | * The ftrace subsystem is for showing formats only. | |
421 | * They can not be enabled or disabled via the event files. | |
422 | */ | |
a1d0ce82 | 423 | if (call->class && call->class->reg) |
30bd39cd | 424 | return call; |
40e26815 | 425 | } |
b77e38aa | 426 | |
30bd39cd | 427 | return NULL; |
b77e38aa SR |
428 | } |
429 | ||
430 | static void *t_start(struct seq_file *m, loff_t *pos) | |
431 | { | |
30bd39cd | 432 | struct ftrace_event_call *call; |
e1c7e2a6 LZ |
433 | loff_t l; |
434 | ||
20c8928a | 435 | mutex_lock(&event_mutex); |
e1c7e2a6 | 436 | |
30bd39cd | 437 | call = list_entry(&ftrace_events, struct ftrace_event_call, list); |
e1c7e2a6 | 438 | for (l = 0; l <= *pos; ) { |
30bd39cd | 439 | call = t_next(m, call, &l); |
e1c7e2a6 LZ |
440 | if (!call) |
441 | break; | |
442 | } | |
443 | return call; | |
b77e38aa SR |
444 | } |
445 | ||
446 | static void * | |
447 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
448 | { | |
30bd39cd | 449 | struct ftrace_event_call *call = v; |
b77e38aa SR |
450 | |
451 | (*pos)++; | |
452 | ||
30bd39cd | 453 | list_for_each_entry_continue(call, &ftrace_events, list) { |
553552ce | 454 | if (call->flags & TRACE_EVENT_FL_ENABLED) |
30bd39cd | 455 | return call; |
b77e38aa SR |
456 | } |
457 | ||
30bd39cd | 458 | return NULL; |
b77e38aa SR |
459 | } |
460 | ||
461 | static void *s_start(struct seq_file *m, loff_t *pos) | |
462 | { | |
30bd39cd | 463 | struct ftrace_event_call *call; |
e1c7e2a6 LZ |
464 | loff_t l; |
465 | ||
20c8928a | 466 | mutex_lock(&event_mutex); |
e1c7e2a6 | 467 | |
30bd39cd | 468 | call = list_entry(&ftrace_events, struct ftrace_event_call, list); |
e1c7e2a6 | 469 | for (l = 0; l <= *pos; ) { |
30bd39cd | 470 | call = s_next(m, call, &l); |
e1c7e2a6 LZ |
471 | if (!call) |
472 | break; | |
473 | } | |
474 | return call; | |
b77e38aa SR |
475 | } |
476 | ||
477 | static int t_show(struct seq_file *m, void *v) | |
478 | { | |
479 | struct ftrace_event_call *call = v; | |
480 | ||
8f082018 SR |
481 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
482 | seq_printf(m, "%s:", call->class->system); | |
b77e38aa SR |
483 | seq_printf(m, "%s\n", call->name); |
484 | ||
485 | return 0; | |
486 | } | |
487 | ||
488 | static void t_stop(struct seq_file *m, void *p) | |
489 | { | |
20c8928a | 490 | mutex_unlock(&event_mutex); |
b77e38aa SR |
491 | } |
492 | ||
1473e441 SR |
493 | static ssize_t |
494 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
495 | loff_t *ppos) | |
496 | { | |
497 | struct ftrace_event_call *call = filp->private_data; | |
498 | char *buf; | |
499 | ||
553552ce | 500 | if (call->flags & TRACE_EVENT_FL_ENABLED) |
1473e441 SR |
501 | buf = "1\n"; |
502 | else | |
503 | buf = "0\n"; | |
504 | ||
505 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
506 | } | |
507 | ||
508 | static ssize_t | |
509 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
510 | loff_t *ppos) | |
511 | { | |
512 | struct ftrace_event_call *call = filp->private_data; | |
1473e441 SR |
513 | unsigned long val; |
514 | int ret; | |
515 | ||
22fe9b54 PH |
516 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
517 | if (ret) | |
1473e441 SR |
518 | return ret; |
519 | ||
1852fcce SR |
520 | ret = tracing_update_buffers(); |
521 | if (ret < 0) | |
522 | return ret; | |
523 | ||
1473e441 SR |
524 | switch (val) { |
525 | case 0: | |
1473e441 | 526 | case 1: |
11a241a3 | 527 | mutex_lock(&event_mutex); |
3b8e4273 | 528 | ret = ftrace_event_enable_disable(call, val); |
11a241a3 | 529 | mutex_unlock(&event_mutex); |
1473e441 SR |
530 | break; |
531 | ||
532 | default: | |
533 | return -EINVAL; | |
534 | } | |
535 | ||
536 | *ppos += cnt; | |
537 | ||
3b8e4273 | 538 | return ret ? ret : cnt; |
1473e441 SR |
539 | } |
540 | ||
8ae79a13 SR |
541 | static ssize_t |
542 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
543 | loff_t *ppos) | |
544 | { | |
c142b15d | 545 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
40ee4dff | 546 | struct event_subsystem *system = filp->private_data; |
8ae79a13 SR |
547 | struct ftrace_event_call *call; |
548 | char buf[2]; | |
c142b15d | 549 | int set = 0; |
8ae79a13 SR |
550 | int ret; |
551 | ||
8ae79a13 SR |
552 | mutex_lock(&event_mutex); |
553 | list_for_each_entry(call, &ftrace_events, list) { | |
a1d0ce82 | 554 | if (!call->name || !call->class || !call->class->reg) |
8ae79a13 SR |
555 | continue; |
556 | ||
40ee4dff | 557 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
558 | continue; |
559 | ||
560 | /* | |
561 | * We need to find out if all the events are set | |
562 | * or if all events or cleared, or if we have | |
563 | * a mixture. | |
564 | */ | |
553552ce | 565 | set |= (1 << !!(call->flags & TRACE_EVENT_FL_ENABLED)); |
c142b15d | 566 | |
8ae79a13 SR |
567 | /* |
568 | * If we have a mixture, no need to look further. | |
569 | */ | |
c142b15d | 570 | if (set == 3) |
8ae79a13 SR |
571 | break; |
572 | } | |
573 | mutex_unlock(&event_mutex); | |
574 | ||
c142b15d | 575 | buf[0] = set_to_char[set]; |
8ae79a13 | 576 | buf[1] = '\n'; |
8ae79a13 SR |
577 | |
578 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
579 | ||
580 | return ret; | |
581 | } | |
582 | ||
583 | static ssize_t | |
584 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
585 | loff_t *ppos) | |
586 | { | |
40ee4dff SR |
587 | struct event_subsystem *system = filp->private_data; |
588 | const char *name = NULL; | |
8ae79a13 | 589 | unsigned long val; |
8ae79a13 SR |
590 | ssize_t ret; |
591 | ||
22fe9b54 PH |
592 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
593 | if (ret) | |
8ae79a13 SR |
594 | return ret; |
595 | ||
596 | ret = tracing_update_buffers(); | |
597 | if (ret < 0) | |
598 | return ret; | |
599 | ||
8f31bfe5 | 600 | if (val != 0 && val != 1) |
8ae79a13 | 601 | return -EINVAL; |
8ae79a13 | 602 | |
40ee4dff SR |
603 | /* |
604 | * Opening of "enable" adds a ref count to system, | |
605 | * so the name is safe to use. | |
606 | */ | |
607 | if (system) | |
608 | name = system->name; | |
609 | ||
610 | ret = __ftrace_set_clr_event(NULL, name, NULL, val); | |
8ae79a13 | 611 | if (ret) |
8f31bfe5 | 612 | goto out; |
8ae79a13 SR |
613 | |
614 | ret = cnt; | |
615 | ||
8f31bfe5 | 616 | out: |
8ae79a13 SR |
617 | *ppos += cnt; |
618 | ||
619 | return ret; | |
620 | } | |
621 | ||
2a37a3df SR |
622 | enum { |
623 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
624 | FORMAT_FIELD_SEPERATOR = 2, |
625 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
626 | }; |
627 | ||
628 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 629 | { |
2a37a3df | 630 | struct ftrace_event_call *call = m->private; |
5a65e956 | 631 | struct ftrace_event_field *field; |
86397dc3 LZ |
632 | struct list_head *common_head = &ftrace_common_fields; |
633 | struct list_head *head = trace_get_fields(call); | |
981d081e | 634 | |
2a37a3df | 635 | (*pos)++; |
5a65e956 | 636 | |
2a37a3df SR |
637 | switch ((unsigned long)v) { |
638 | case FORMAT_HEADER: | |
86397dc3 LZ |
639 | if (unlikely(list_empty(common_head))) |
640 | return NULL; | |
641 | ||
642 | field = list_entry(common_head->prev, | |
643 | struct ftrace_event_field, link); | |
644 | return field; | |
5a65e956 | 645 | |
86397dc3 | 646 | case FORMAT_FIELD_SEPERATOR: |
2a37a3df SR |
647 | if (unlikely(list_empty(head))) |
648 | return NULL; | |
5a65e956 | 649 | |
2a37a3df SR |
650 | field = list_entry(head->prev, struct ftrace_event_field, link); |
651 | return field; | |
5a65e956 | 652 | |
2a37a3df SR |
653 | case FORMAT_PRINTFMT: |
654 | /* all done */ | |
655 | return NULL; | |
5a65e956 LJ |
656 | } |
657 | ||
2a37a3df | 658 | field = v; |
86397dc3 LZ |
659 | if (field->link.prev == common_head) |
660 | return (void *)FORMAT_FIELD_SEPERATOR; | |
661 | else if (field->link.prev == head) | |
2a37a3df SR |
662 | return (void *)FORMAT_PRINTFMT; |
663 | ||
664 | field = list_entry(field->link.prev, struct ftrace_event_field, link); | |
665 | ||
2a37a3df | 666 | return field; |
8728fe50 | 667 | } |
5a65e956 | 668 | |
2a37a3df | 669 | static void *f_start(struct seq_file *m, loff_t *pos) |
8728fe50 | 670 | { |
2a37a3df SR |
671 | loff_t l = 0; |
672 | void *p; | |
5a65e956 | 673 | |
2a37a3df SR |
674 | /* Start by showing the header */ |
675 | if (!*pos) | |
676 | return (void *)FORMAT_HEADER; | |
677 | ||
678 | p = (void *)FORMAT_HEADER; | |
679 | do { | |
680 | p = f_next(m, p, &l); | |
681 | } while (p && l < *pos); | |
682 | ||
683 | return p; | |
684 | } | |
685 | ||
686 | static int f_show(struct seq_file *m, void *v) | |
687 | { | |
688 | struct ftrace_event_call *call = m->private; | |
689 | struct ftrace_event_field *field; | |
690 | const char *array_descriptor; | |
691 | ||
692 | switch ((unsigned long)v) { | |
693 | case FORMAT_HEADER: | |
694 | seq_printf(m, "name: %s\n", call->name); | |
695 | seq_printf(m, "ID: %d\n", call->event.type); | |
696 | seq_printf(m, "format:\n"); | |
8728fe50 | 697 | return 0; |
5a65e956 | 698 | |
86397dc3 LZ |
699 | case FORMAT_FIELD_SEPERATOR: |
700 | seq_putc(m, '\n'); | |
701 | return 0; | |
702 | ||
2a37a3df SR |
703 | case FORMAT_PRINTFMT: |
704 | seq_printf(m, "\nprint fmt: %s\n", | |
705 | call->print_fmt); | |
706 | return 0; | |
981d081e | 707 | } |
8728fe50 | 708 | |
2a37a3df | 709 | field = v; |
8728fe50 | 710 | |
2a37a3df SR |
711 | /* |
712 | * Smartly shows the array type(except dynamic array). | |
713 | * Normal: | |
714 | * field:TYPE VAR | |
715 | * If TYPE := TYPE[LEN], it is shown: | |
716 | * field:TYPE VAR[LEN] | |
717 | */ | |
718 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 719 | |
2a37a3df SR |
720 | if (!strncmp(field->type, "__data_loc", 10)) |
721 | array_descriptor = NULL; | |
8728fe50 | 722 | |
2a37a3df SR |
723 | if (!array_descriptor) |
724 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
725 | field->type, field->name, field->offset, | |
726 | field->size, !!field->is_signed); | |
727 | else | |
728 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
729 | (int)(array_descriptor - field->type), | |
730 | field->type, field->name, | |
731 | array_descriptor, field->offset, | |
732 | field->size, !!field->is_signed); | |
8728fe50 | 733 | |
2a37a3df SR |
734 | return 0; |
735 | } | |
5a65e956 | 736 | |
2a37a3df SR |
737 | static void f_stop(struct seq_file *m, void *p) |
738 | { | |
739 | } | |
981d081e | 740 | |
2a37a3df SR |
741 | static const struct seq_operations trace_format_seq_ops = { |
742 | .start = f_start, | |
743 | .next = f_next, | |
744 | .stop = f_stop, | |
745 | .show = f_show, | |
746 | }; | |
747 | ||
748 | static int trace_format_open(struct inode *inode, struct file *file) | |
749 | { | |
750 | struct ftrace_event_call *call = inode->i_private; | |
751 | struct seq_file *m; | |
752 | int ret; | |
753 | ||
754 | ret = seq_open(file, &trace_format_seq_ops); | |
755 | if (ret < 0) | |
756 | return ret; | |
757 | ||
758 | m = file->private_data; | |
759 | m->private = call; | |
760 | ||
761 | return 0; | |
981d081e SR |
762 | } |
763 | ||
23725aee PZ |
764 | static ssize_t |
765 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
766 | { | |
767 | struct ftrace_event_call *call = filp->private_data; | |
768 | struct trace_seq *s; | |
769 | int r; | |
770 | ||
771 | if (*ppos) | |
772 | return 0; | |
773 | ||
774 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
775 | if (!s) | |
776 | return -ENOMEM; | |
777 | ||
778 | trace_seq_init(s); | |
32c0edae | 779 | trace_seq_printf(s, "%d\n", call->event.type); |
23725aee PZ |
780 | |
781 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
782 | s->buffer, s->len); | |
783 | kfree(s); | |
784 | return r; | |
785 | } | |
786 | ||
7ce7e424 TZ |
787 | static ssize_t |
788 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
789 | loff_t *ppos) | |
790 | { | |
791 | struct ftrace_event_call *call = filp->private_data; | |
792 | struct trace_seq *s; | |
793 | int r; | |
794 | ||
795 | if (*ppos) | |
796 | return 0; | |
797 | ||
798 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
799 | if (!s) | |
800 | return -ENOMEM; | |
801 | ||
802 | trace_seq_init(s); | |
803 | ||
8b372562 | 804 | print_event_filter(call, s); |
4bda2d51 | 805 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
806 | |
807 | kfree(s); | |
808 | ||
809 | return r; | |
810 | } | |
811 | ||
812 | static ssize_t | |
813 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
814 | loff_t *ppos) | |
815 | { | |
816 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 817 | char *buf; |
7ce7e424 TZ |
818 | int err; |
819 | ||
8b372562 | 820 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
821 | return -EINVAL; |
822 | ||
8b372562 TZ |
823 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
824 | if (!buf) | |
7ce7e424 TZ |
825 | return -ENOMEM; |
826 | ||
8b372562 TZ |
827 | if (copy_from_user(buf, ubuf, cnt)) { |
828 | free_page((unsigned long) buf); | |
829 | return -EFAULT; | |
7ce7e424 | 830 | } |
8b372562 | 831 | buf[cnt] = '\0'; |
7ce7e424 | 832 | |
8b372562 TZ |
833 | err = apply_event_filter(call, buf); |
834 | free_page((unsigned long) buf); | |
835 | if (err < 0) | |
44e9c8b7 | 836 | return err; |
0a19e53c | 837 | |
7ce7e424 TZ |
838 | *ppos += cnt; |
839 | ||
840 | return cnt; | |
841 | } | |
842 | ||
e9dbfae5 SR |
843 | static LIST_HEAD(event_subsystems); |
844 | ||
845 | static int subsystem_open(struct inode *inode, struct file *filp) | |
846 | { | |
847 | struct event_subsystem *system = NULL; | |
848 | int ret; | |
849 | ||
40ee4dff SR |
850 | if (!inode->i_private) |
851 | goto skip_search; | |
852 | ||
e9dbfae5 SR |
853 | /* Make sure the system still exists */ |
854 | mutex_lock(&event_mutex); | |
855 | list_for_each_entry(system, &event_subsystems, list) { | |
856 | if (system == inode->i_private) { | |
857 | /* Don't open systems with no events */ | |
858 | if (!system->nr_events) { | |
859 | system = NULL; | |
860 | break; | |
861 | } | |
862 | __get_system(system); | |
863 | break; | |
864 | } | |
865 | } | |
866 | mutex_unlock(&event_mutex); | |
867 | ||
868 | if (system != inode->i_private) | |
869 | return -ENODEV; | |
870 | ||
40ee4dff | 871 | skip_search: |
e9dbfae5 | 872 | ret = tracing_open_generic(inode, filp); |
40ee4dff | 873 | if (ret < 0 && system) |
e9dbfae5 SR |
874 | put_system(system); |
875 | ||
876 | return ret; | |
877 | } | |
878 | ||
879 | static int subsystem_release(struct inode *inode, struct file *file) | |
880 | { | |
881 | struct event_subsystem *system = inode->i_private; | |
882 | ||
40ee4dff SR |
883 | if (system) |
884 | put_system(system); | |
e9dbfae5 SR |
885 | |
886 | return 0; | |
887 | } | |
888 | ||
cfb180f3 TZ |
889 | static ssize_t |
890 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
891 | loff_t *ppos) | |
892 | { | |
893 | struct event_subsystem *system = filp->private_data; | |
894 | struct trace_seq *s; | |
895 | int r; | |
896 | ||
897 | if (*ppos) | |
898 | return 0; | |
899 | ||
900 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
901 | if (!s) | |
902 | return -ENOMEM; | |
903 | ||
904 | trace_seq_init(s); | |
905 | ||
8b372562 | 906 | print_subsystem_event_filter(system, s); |
4bda2d51 | 907 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
908 | |
909 | kfree(s); | |
910 | ||
911 | return r; | |
912 | } | |
913 | ||
914 | static ssize_t | |
915 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
916 | loff_t *ppos) | |
917 | { | |
918 | struct event_subsystem *system = filp->private_data; | |
8b372562 | 919 | char *buf; |
cfb180f3 TZ |
920 | int err; |
921 | ||
8b372562 | 922 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
923 | return -EINVAL; |
924 | ||
8b372562 TZ |
925 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
926 | if (!buf) | |
cfb180f3 TZ |
927 | return -ENOMEM; |
928 | ||
8b372562 TZ |
929 | if (copy_from_user(buf, ubuf, cnt)) { |
930 | free_page((unsigned long) buf); | |
931 | return -EFAULT; | |
cfb180f3 | 932 | } |
8b372562 | 933 | buf[cnt] = '\0'; |
cfb180f3 | 934 | |
8b372562 TZ |
935 | err = apply_subsystem_event_filter(system, buf); |
936 | free_page((unsigned long) buf); | |
937 | if (err < 0) | |
44e9c8b7 | 938 | return err; |
cfb180f3 TZ |
939 | |
940 | *ppos += cnt; | |
941 | ||
942 | return cnt; | |
943 | } | |
944 | ||
d1b182a8 SR |
945 | static ssize_t |
946 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
947 | { | |
948 | int (*func)(struct trace_seq *s) = filp->private_data; | |
949 | struct trace_seq *s; | |
950 | int r; | |
951 | ||
952 | if (*ppos) | |
953 | return 0; | |
954 | ||
955 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
956 | if (!s) | |
957 | return -ENOMEM; | |
958 | ||
959 | trace_seq_init(s); | |
960 | ||
961 | func(s); | |
962 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
963 | ||
964 | kfree(s); | |
965 | ||
966 | return r; | |
967 | } | |
968 | ||
15075cac SR |
969 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
970 | static int ftrace_event_set_open(struct inode *inode, struct file *file); | |
971 | ||
b77e38aa SR |
972 | static const struct seq_operations show_event_seq_ops = { |
973 | .start = t_start, | |
974 | .next = t_next, | |
975 | .show = t_show, | |
976 | .stop = t_stop, | |
977 | }; | |
978 | ||
979 | static const struct seq_operations show_set_event_seq_ops = { | |
980 | .start = s_start, | |
981 | .next = s_next, | |
982 | .show = t_show, | |
983 | .stop = t_stop, | |
984 | }; | |
985 | ||
2314c4ae | 986 | static const struct file_operations ftrace_avail_fops = { |
15075cac | 987 | .open = ftrace_event_avail_open, |
2314c4ae SR |
988 | .read = seq_read, |
989 | .llseek = seq_lseek, | |
990 | .release = seq_release, | |
991 | }; | |
992 | ||
b77e38aa | 993 | static const struct file_operations ftrace_set_event_fops = { |
15075cac | 994 | .open = ftrace_event_set_open, |
b77e38aa SR |
995 | .read = seq_read, |
996 | .write = ftrace_event_write, | |
997 | .llseek = seq_lseek, | |
998 | .release = seq_release, | |
999 | }; | |
1000 | ||
1473e441 SR |
1001 | static const struct file_operations ftrace_enable_fops = { |
1002 | .open = tracing_open_generic, | |
1003 | .read = event_enable_read, | |
1004 | .write = event_enable_write, | |
6038f373 | 1005 | .llseek = default_llseek, |
1473e441 SR |
1006 | }; |
1007 | ||
981d081e | 1008 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
1009 | .open = trace_format_open, |
1010 | .read = seq_read, | |
1011 | .llseek = seq_lseek, | |
1012 | .release = seq_release, | |
981d081e SR |
1013 | }; |
1014 | ||
23725aee PZ |
1015 | static const struct file_operations ftrace_event_id_fops = { |
1016 | .open = tracing_open_generic, | |
1017 | .read = event_id_read, | |
6038f373 | 1018 | .llseek = default_llseek, |
23725aee PZ |
1019 | }; |
1020 | ||
7ce7e424 TZ |
1021 | static const struct file_operations ftrace_event_filter_fops = { |
1022 | .open = tracing_open_generic, | |
1023 | .read = event_filter_read, | |
1024 | .write = event_filter_write, | |
6038f373 | 1025 | .llseek = default_llseek, |
7ce7e424 TZ |
1026 | }; |
1027 | ||
cfb180f3 | 1028 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 1029 | .open = subsystem_open, |
cfb180f3 TZ |
1030 | .read = subsystem_filter_read, |
1031 | .write = subsystem_filter_write, | |
6038f373 | 1032 | .llseek = default_llseek, |
e9dbfae5 | 1033 | .release = subsystem_release, |
cfb180f3 TZ |
1034 | }; |
1035 | ||
8ae79a13 | 1036 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 1037 | .open = subsystem_open, |
8ae79a13 SR |
1038 | .read = system_enable_read, |
1039 | .write = system_enable_write, | |
6038f373 | 1040 | .llseek = default_llseek, |
40ee4dff | 1041 | .release = subsystem_release, |
8ae79a13 SR |
1042 | }; |
1043 | ||
d1b182a8 SR |
1044 | static const struct file_operations ftrace_show_header_fops = { |
1045 | .open = tracing_open_generic, | |
1046 | .read = show_header, | |
6038f373 | 1047 | .llseek = default_llseek, |
d1b182a8 SR |
1048 | }; |
1049 | ||
1473e441 SR |
1050 | static struct dentry *event_trace_events_dir(void) |
1051 | { | |
1052 | static struct dentry *d_tracer; | |
1053 | static struct dentry *d_events; | |
1054 | ||
1055 | if (d_events) | |
1056 | return d_events; | |
1057 | ||
1058 | d_tracer = tracing_init_dentry(); | |
1059 | if (!d_tracer) | |
1060 | return NULL; | |
1061 | ||
1062 | d_events = debugfs_create_dir("events", d_tracer); | |
1063 | if (!d_events) | |
1064 | pr_warning("Could not create debugfs " | |
1065 | "'events' directory\n"); | |
1066 | ||
1067 | return d_events; | |
1068 | } | |
1069 | ||
15075cac SR |
1070 | static int |
1071 | ftrace_event_avail_open(struct inode *inode, struct file *file) | |
1072 | { | |
1073 | const struct seq_operations *seq_ops = &show_event_seq_ops; | |
1074 | ||
1075 | return seq_open(file, seq_ops); | |
1076 | } | |
1077 | ||
1078 | static int | |
1079 | ftrace_event_set_open(struct inode *inode, struct file *file) | |
1080 | { | |
1081 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; | |
1082 | ||
1083 | if ((file->f_mode & FMODE_WRITE) && | |
1084 | (file->f_flags & O_TRUNC)) | |
1085 | ftrace_clear_events(); | |
1086 | ||
1087 | return seq_open(file, seq_ops); | |
1088 | } | |
1089 | ||
6ecc2d1c SR |
1090 | static struct dentry * |
1091 | event_subsystem_dir(const char *name, struct dentry *d_events) | |
1092 | { | |
1093 | struct event_subsystem *system; | |
e1112b4d | 1094 | struct dentry *entry; |
6ecc2d1c SR |
1095 | |
1096 | /* First see if we did not already create this dir */ | |
1097 | list_for_each_entry(system, &event_subsystems, list) { | |
dc82ec98 XG |
1098 | if (strcmp(system->name, name) == 0) { |
1099 | system->nr_events++; | |
6ecc2d1c | 1100 | return system->entry; |
dc82ec98 | 1101 | } |
6ecc2d1c SR |
1102 | } |
1103 | ||
1104 | /* need to create new entry */ | |
1105 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1106 | if (!system) { | |
1107 | pr_warning("No memory to create event subsystem %s\n", | |
1108 | name); | |
1109 | return d_events; | |
1110 | } | |
1111 | ||
1112 | system->entry = debugfs_create_dir(name, d_events); | |
1113 | if (!system->entry) { | |
1114 | pr_warning("Could not create event subsystem %s\n", | |
1115 | name); | |
1116 | kfree(system); | |
1117 | return d_events; | |
1118 | } | |
1119 | ||
dc82ec98 | 1120 | system->nr_events = 1; |
e9dbfae5 | 1121 | system->ref_count = 1; |
6d723736 SR |
1122 | system->name = kstrdup(name, GFP_KERNEL); |
1123 | if (!system->name) { | |
1124 | debugfs_remove(system->entry); | |
1125 | kfree(system); | |
1126 | return d_events; | |
1127 | } | |
1128 | ||
6ecc2d1c SR |
1129 | list_add(&system->list, &event_subsystems); |
1130 | ||
30e673b2 | 1131 | system->filter = NULL; |
cfb180f3 | 1132 | |
8b372562 TZ |
1133 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
1134 | if (!system->filter) { | |
1135 | pr_warning("Could not allocate filter for subsystem " | |
1136 | "'%s'\n", name); | |
1137 | return system->entry; | |
1138 | } | |
1139 | ||
e1112b4d TZ |
1140 | entry = debugfs_create_file("filter", 0644, system->entry, system, |
1141 | &ftrace_subsystem_filter_fops); | |
8b372562 TZ |
1142 | if (!entry) { |
1143 | kfree(system->filter); | |
1144 | system->filter = NULL; | |
e1112b4d TZ |
1145 | pr_warning("Could not create debugfs " |
1146 | "'%s/filter' entry\n", name); | |
8b372562 | 1147 | } |
e1112b4d | 1148 | |
40ee4dff | 1149 | trace_create_file("enable", 0644, system->entry, system, |
f3f3f009 | 1150 | &ftrace_system_enable_fops); |
8ae79a13 | 1151 | |
6ecc2d1c SR |
1152 | return system->entry; |
1153 | } | |
1154 | ||
1473e441 | 1155 | static int |
701970b3 SR |
1156 | event_create_dir(struct ftrace_event_call *call, struct dentry *d_events, |
1157 | const struct file_operations *id, | |
1158 | const struct file_operations *enable, | |
1159 | const struct file_operations *filter, | |
1160 | const struct file_operations *format) | |
1473e441 | 1161 | { |
2e33af02 | 1162 | struct list_head *head; |
fd994989 | 1163 | int ret; |
1473e441 | 1164 | |
6ecc2d1c SR |
1165 | /* |
1166 | * If the trace point header did not define TRACE_SYSTEM | |
1167 | * then the system would be called "TRACE_SYSTEM". | |
1168 | */ | |
8f082018 SR |
1169 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
1170 | d_events = event_subsystem_dir(call->class->system, d_events); | |
6ecc2d1c | 1171 | |
1473e441 SR |
1172 | call->dir = debugfs_create_dir(call->name, d_events); |
1173 | if (!call->dir) { | |
1174 | pr_warning("Could not create debugfs " | |
1175 | "'%s' directory\n", call->name); | |
1176 | return -1; | |
1177 | } | |
1178 | ||
9b63776f | 1179 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
f3f3f009 FW |
1180 | trace_create_file("enable", 0644, call->dir, call, |
1181 | enable); | |
1473e441 | 1182 | |
2239291a | 1183 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 1184 | if (call->event.type && call->class->reg) |
f3f3f009 FW |
1185 | trace_create_file("id", 0444, call->dir, call, |
1186 | id); | |
2239291a | 1187 | #endif |
23725aee | 1188 | |
c9d932cf LZ |
1189 | /* |
1190 | * Other events may have the same class. Only update | |
1191 | * the fields if they are not already defined. | |
1192 | */ | |
1193 | head = trace_get_fields(call); | |
1194 | if (list_empty(head)) { | |
1195 | ret = call->class->define_fields(call); | |
1196 | if (ret < 0) { | |
1197 | pr_warning("Could not initialize trace point" | |
1198 | " events/%s\n", call->name); | |
1199 | return ret; | |
cf027f64 TZ |
1200 | } |
1201 | } | |
c9d932cf LZ |
1202 | trace_create_file("filter", 0644, call->dir, call, |
1203 | filter); | |
cf027f64 | 1204 | |
f3f3f009 FW |
1205 | trace_create_file("format", 0444, call->dir, call, |
1206 | format); | |
6d723736 SR |
1207 | |
1208 | return 0; | |
1209 | } | |
1210 | ||
8781915a EG |
1211 | static void event_remove(struct ftrace_event_call *call) |
1212 | { | |
1213 | ftrace_event_enable_disable(call, 0); | |
1214 | if (call->event.funcs) | |
1215 | __unregister_ftrace_event(&call->event); | |
1216 | list_del(&call->list); | |
1217 | } | |
1218 | ||
1219 | static int event_init(struct ftrace_event_call *call) | |
1220 | { | |
1221 | int ret = 0; | |
1222 | ||
1223 | if (WARN_ON(!call->name)) | |
1224 | return -EINVAL; | |
1225 | ||
1226 | if (call->class->raw_init) { | |
1227 | ret = call->class->raw_init(call); | |
1228 | if (ret < 0 && ret != -ENOSYS) | |
1229 | pr_warn("Could not initialize trace events/%s\n", | |
1230 | call->name); | |
1231 | } | |
1232 | ||
1233 | return ret; | |
1234 | } | |
1235 | ||
67ead0a6 LZ |
1236 | static int |
1237 | __trace_add_event_call(struct ftrace_event_call *call, struct module *mod, | |
1238 | const struct file_operations *id, | |
1239 | const struct file_operations *enable, | |
1240 | const struct file_operations *filter, | |
1241 | const struct file_operations *format) | |
bd1a5c84 MH |
1242 | { |
1243 | struct dentry *d_events; | |
1244 | int ret; | |
6d723736 | 1245 | |
8781915a EG |
1246 | ret = event_init(call); |
1247 | if (ret < 0) | |
1248 | return ret; | |
701970b3 | 1249 | |
bd1a5c84 MH |
1250 | d_events = event_trace_events_dir(); |
1251 | if (!d_events) | |
1252 | return -ENOENT; | |
1253 | ||
67ead0a6 | 1254 | ret = event_create_dir(call, d_events, id, enable, filter, format); |
88f70d75 MH |
1255 | if (!ret) |
1256 | list_add(&call->list, &ftrace_events); | |
67ead0a6 | 1257 | call->mod = mod; |
88f70d75 | 1258 | |
588bebb7 | 1259 | return ret; |
bd1a5c84 MH |
1260 | } |
1261 | ||
1262 | /* Add an additional event_call dynamically */ | |
1263 | int trace_add_event_call(struct ftrace_event_call *call) | |
1264 | { | |
1265 | int ret; | |
1266 | mutex_lock(&event_mutex); | |
67ead0a6 LZ |
1267 | ret = __trace_add_event_call(call, NULL, &ftrace_event_id_fops, |
1268 | &ftrace_enable_fops, | |
1269 | &ftrace_event_filter_fops, | |
1270 | &ftrace_event_format_fops); | |
bd1a5c84 MH |
1271 | mutex_unlock(&event_mutex); |
1272 | return ret; | |
1273 | } | |
701970b3 | 1274 | |
a2ca5e03 FW |
1275 | static void remove_subsystem_dir(const char *name) |
1276 | { | |
1277 | struct event_subsystem *system; | |
1278 | ||
1279 | if (strcmp(name, TRACE_SYSTEM) == 0) | |
1280 | return; | |
1281 | ||
1282 | list_for_each_entry(system, &event_subsystems, list) { | |
1283 | if (strcmp(system->name, name) == 0) { | |
1284 | if (!--system->nr_events) { | |
a2ca5e03 FW |
1285 | debugfs_remove_recursive(system->entry); |
1286 | list_del(&system->list); | |
e9dbfae5 | 1287 | __put_system(system); |
a2ca5e03 FW |
1288 | } |
1289 | break; | |
1290 | } | |
1291 | } | |
1292 | } | |
1293 | ||
4fead8e4 MH |
1294 | /* |
1295 | * Must be called under locking both of event_mutex and trace_event_mutex. | |
1296 | */ | |
bd1a5c84 MH |
1297 | static void __trace_remove_event_call(struct ftrace_event_call *call) |
1298 | { | |
8781915a | 1299 | event_remove(call); |
bd1a5c84 MH |
1300 | trace_destroy_fields(call); |
1301 | destroy_preds(call); | |
8781915a | 1302 | debugfs_remove_recursive(call->dir); |
8f082018 | 1303 | remove_subsystem_dir(call->class->system); |
bd1a5c84 MH |
1304 | } |
1305 | ||
1306 | /* Remove an event_call */ | |
1307 | void trace_remove_event_call(struct ftrace_event_call *call) | |
1308 | { | |
1309 | mutex_lock(&event_mutex); | |
4fead8e4 | 1310 | down_write(&trace_event_mutex); |
bd1a5c84 | 1311 | __trace_remove_event_call(call); |
4fead8e4 | 1312 | up_write(&trace_event_mutex); |
bd1a5c84 MH |
1313 | mutex_unlock(&event_mutex); |
1314 | } | |
1315 | ||
1316 | #define for_each_event(event, start, end) \ | |
1317 | for (event = start; \ | |
1318 | (unsigned long)event < (unsigned long)end; \ | |
1319 | event++) | |
1320 | ||
1321 | #ifdef CONFIG_MODULES | |
1322 | ||
1323 | static LIST_HEAD(ftrace_module_file_list); | |
1324 | ||
1325 | /* | |
1326 | * Modules must own their file_operations to keep up with | |
1327 | * reference counting. | |
1328 | */ | |
1329 | struct ftrace_module_file_ops { | |
1330 | struct list_head list; | |
1331 | struct module *mod; | |
1332 | struct file_operations id; | |
1333 | struct file_operations enable; | |
1334 | struct file_operations format; | |
1335 | struct file_operations filter; | |
1336 | }; | |
1337 | ||
701970b3 SR |
1338 | static struct ftrace_module_file_ops * |
1339 | trace_create_file_ops(struct module *mod) | |
1340 | { | |
1341 | struct ftrace_module_file_ops *file_ops; | |
1342 | ||
1343 | /* | |
1344 | * This is a bit of a PITA. To allow for correct reference | |
1345 | * counting, modules must "own" their file_operations. | |
1346 | * To do this, we allocate the file operations that will be | |
1347 | * used in the event directory. | |
1348 | */ | |
1349 | ||
1350 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1351 | if (!file_ops) | |
1352 | return NULL; | |
1353 | ||
1354 | file_ops->mod = mod; | |
1355 | ||
1356 | file_ops->id = ftrace_event_id_fops; | |
1357 | file_ops->id.owner = mod; | |
1358 | ||
1359 | file_ops->enable = ftrace_enable_fops; | |
1360 | file_ops->enable.owner = mod; | |
1361 | ||
1362 | file_ops->filter = ftrace_event_filter_fops; | |
1363 | file_ops->filter.owner = mod; | |
1364 | ||
1365 | file_ops->format = ftrace_event_format_fops; | |
1366 | file_ops->format.owner = mod; | |
1367 | ||
1368 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1369 | ||
1370 | return file_ops; | |
1371 | } | |
1372 | ||
6d723736 SR |
1373 | static void trace_module_add_events(struct module *mod) |
1374 | { | |
701970b3 | 1375 | struct ftrace_module_file_ops *file_ops = NULL; |
e4a9ea5e | 1376 | struct ftrace_event_call **call, **start, **end; |
6d723736 SR |
1377 | |
1378 | start = mod->trace_events; | |
1379 | end = mod->trace_events + mod->num_trace_events; | |
1380 | ||
1381 | if (start == end) | |
1382 | return; | |
1383 | ||
67ead0a6 LZ |
1384 | file_ops = trace_create_file_ops(mod); |
1385 | if (!file_ops) | |
6d723736 SR |
1386 | return; |
1387 | ||
1388 | for_each_event(call, start, end) { | |
e4a9ea5e | 1389 | __trace_add_event_call(*call, mod, |
88f70d75 MH |
1390 | &file_ops->id, &file_ops->enable, |
1391 | &file_ops->filter, &file_ops->format); | |
6d723736 SR |
1392 | } |
1393 | } | |
1394 | ||
1395 | static void trace_module_remove_events(struct module *mod) | |
1396 | { | |
701970b3 | 1397 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1398 | struct ftrace_event_call *call, *p; |
9456f0fa | 1399 | bool found = false; |
6d723736 | 1400 | |
110bf2b7 | 1401 | down_write(&trace_event_mutex); |
6d723736 SR |
1402 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1403 | if (call->mod == mod) { | |
9456f0fa | 1404 | found = true; |
bd1a5c84 | 1405 | __trace_remove_event_call(call); |
6d723736 SR |
1406 | } |
1407 | } | |
701970b3 SR |
1408 | |
1409 | /* Now free the file_operations */ | |
1410 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1411 | if (file_ops->mod == mod) | |
1412 | break; | |
1413 | } | |
1414 | if (&file_ops->list != &ftrace_module_file_list) { | |
1415 | list_del(&file_ops->list); | |
1416 | kfree(file_ops); | |
1417 | } | |
9456f0fa SR |
1418 | |
1419 | /* | |
1420 | * It is safest to reset the ring buffer if the module being unloaded | |
1421 | * registered any events. | |
1422 | */ | |
1423 | if (found) | |
1424 | tracing_reset_current_online_cpus(); | |
110bf2b7 | 1425 | up_write(&trace_event_mutex); |
6d723736 SR |
1426 | } |
1427 | ||
61f919a1 SR |
1428 | static int trace_module_notify(struct notifier_block *self, |
1429 | unsigned long val, void *data) | |
6d723736 SR |
1430 | { |
1431 | struct module *mod = data; | |
1432 | ||
1433 | mutex_lock(&event_mutex); | |
1434 | switch (val) { | |
1435 | case MODULE_STATE_COMING: | |
1436 | trace_module_add_events(mod); | |
1437 | break; | |
1438 | case MODULE_STATE_GOING: | |
1439 | trace_module_remove_events(mod); | |
1440 | break; | |
1441 | } | |
1442 | mutex_unlock(&event_mutex); | |
fd994989 | 1443 | |
1473e441 SR |
1444 | return 0; |
1445 | } | |
61f919a1 SR |
1446 | #else |
1447 | static int trace_module_notify(struct notifier_block *self, | |
1448 | unsigned long val, void *data) | |
1449 | { | |
1450 | return 0; | |
1451 | } | |
1452 | #endif /* CONFIG_MODULES */ | |
1473e441 | 1453 | |
ec827c7e | 1454 | static struct notifier_block trace_module_nb = { |
6d723736 SR |
1455 | .notifier_call = trace_module_notify, |
1456 | .priority = 0, | |
1457 | }; | |
1458 | ||
e4a9ea5e SR |
1459 | extern struct ftrace_event_call *__start_ftrace_events[]; |
1460 | extern struct ftrace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 1461 | |
020e5f85 LZ |
1462 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
1463 | ||
1464 | static __init int setup_trace_event(char *str) | |
1465 | { | |
1466 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
1467 | ring_buffer_expanded = 1; | |
1468 | tracing_selftest_disabled = 1; | |
1469 | ||
1470 | return 1; | |
1471 | } | |
1472 | __setup("trace_event=", setup_trace_event); | |
1473 | ||
8781915a EG |
1474 | static __init int event_trace_enable(void) |
1475 | { | |
1476 | struct ftrace_event_call **iter, *call; | |
1477 | char *buf = bootup_event_buf; | |
1478 | char *token; | |
1479 | int ret; | |
1480 | ||
1481 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { | |
1482 | ||
1483 | call = *iter; | |
1484 | ret = event_init(call); | |
1485 | if (!ret) | |
1486 | list_add(&call->list, &ftrace_events); | |
1487 | } | |
1488 | ||
1489 | while (true) { | |
1490 | token = strsep(&buf, ","); | |
1491 | ||
1492 | if (!token) | |
1493 | break; | |
1494 | if (!*token) | |
1495 | continue; | |
1496 | ||
1497 | ret = ftrace_set_clr_event(token, 1); | |
1498 | if (ret) | |
1499 | pr_warn("Failed to enable trace event: %s\n", token); | |
1500 | } | |
81698831 SR |
1501 | |
1502 | trace_printk_start_comm(); | |
1503 | ||
8781915a EG |
1504 | return 0; |
1505 | } | |
1506 | ||
b77e38aa SR |
1507 | static __init int event_trace_init(void) |
1508 | { | |
8781915a | 1509 | struct ftrace_event_call *call; |
b77e38aa SR |
1510 | struct dentry *d_tracer; |
1511 | struct dentry *entry; | |
1473e441 | 1512 | struct dentry *d_events; |
6d723736 | 1513 | int ret; |
b77e38aa SR |
1514 | |
1515 | d_tracer = tracing_init_dentry(); | |
1516 | if (!d_tracer) | |
1517 | return 0; | |
1518 | ||
2314c4ae | 1519 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
15075cac | 1520 | NULL, &ftrace_avail_fops); |
2314c4ae SR |
1521 | if (!entry) |
1522 | pr_warning("Could not create debugfs " | |
1523 | "'available_events' entry\n"); | |
1524 | ||
b77e38aa | 1525 | entry = debugfs_create_file("set_event", 0644, d_tracer, |
15075cac | 1526 | NULL, &ftrace_set_event_fops); |
b77e38aa SR |
1527 | if (!entry) |
1528 | pr_warning("Could not create debugfs " | |
1529 | "'set_event' entry\n"); | |
1530 | ||
1473e441 SR |
1531 | d_events = event_trace_events_dir(); |
1532 | if (!d_events) | |
1533 | return 0; | |
1534 | ||
d1b182a8 SR |
1535 | /* ring buffer internal formats */ |
1536 | trace_create_file("header_page", 0444, d_events, | |
1537 | ring_buffer_print_page_header, | |
1538 | &ftrace_show_header_fops); | |
1539 | ||
1540 | trace_create_file("header_event", 0444, d_events, | |
1541 | ring_buffer_print_entry_header, | |
1542 | &ftrace_show_header_fops); | |
1543 | ||
8ae79a13 | 1544 | trace_create_file("enable", 0644, d_events, |
8f31bfe5 | 1545 | NULL, &ftrace_system_enable_fops); |
8ae79a13 | 1546 | |
8728fe50 LZ |
1547 | if (trace_define_common_fields()) |
1548 | pr_warning("tracing: Failed to allocate common fields"); | |
1549 | ||
8781915a EG |
1550 | /* |
1551 | * Early initialization already enabled ftrace event. | |
1552 | * Now it's only necessary to create the event directory. | |
1553 | */ | |
1554 | list_for_each_entry(call, &ftrace_events, list) { | |
1555 | ||
1556 | ret = event_create_dir(call, d_events, | |
1557 | &ftrace_event_id_fops, | |
88f70d75 MH |
1558 | &ftrace_enable_fops, |
1559 | &ftrace_event_filter_fops, | |
1560 | &ftrace_event_format_fops); | |
8781915a EG |
1561 | if (ret < 0) |
1562 | event_remove(call); | |
020e5f85 LZ |
1563 | } |
1564 | ||
6d723736 | 1565 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 1566 | if (ret) |
6d723736 SR |
1567 | pr_warning("Failed to register trace events module notifier\n"); |
1568 | ||
b77e38aa SR |
1569 | return 0; |
1570 | } | |
8781915a | 1571 | core_initcall(event_trace_enable); |
b77e38aa | 1572 | fs_initcall(event_trace_init); |
e6187007 SR |
1573 | |
1574 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1575 | ||
1576 | static DEFINE_SPINLOCK(test_spinlock); | |
1577 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
1578 | static DEFINE_MUTEX(test_mutex); | |
1579 | ||
1580 | static __init void test_work(struct work_struct *dummy) | |
1581 | { | |
1582 | spin_lock(&test_spinlock); | |
1583 | spin_lock_irq(&test_spinlock_irq); | |
1584 | udelay(1); | |
1585 | spin_unlock_irq(&test_spinlock_irq); | |
1586 | spin_unlock(&test_spinlock); | |
1587 | ||
1588 | mutex_lock(&test_mutex); | |
1589 | msleep(1); | |
1590 | mutex_unlock(&test_mutex); | |
1591 | } | |
1592 | ||
1593 | static __init int event_test_thread(void *unused) | |
1594 | { | |
1595 | void *test_malloc; | |
1596 | ||
1597 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
1598 | if (!test_malloc) | |
1599 | pr_info("failed to kmalloc\n"); | |
1600 | ||
1601 | schedule_on_each_cpu(test_work); | |
1602 | ||
1603 | kfree(test_malloc); | |
1604 | ||
1605 | set_current_state(TASK_INTERRUPTIBLE); | |
1606 | while (!kthread_should_stop()) | |
1607 | schedule(); | |
1608 | ||
1609 | return 0; | |
1610 | } | |
1611 | ||
1612 | /* | |
1613 | * Do various things that may trigger events. | |
1614 | */ | |
1615 | static __init void event_test_stuff(void) | |
1616 | { | |
1617 | struct task_struct *test_thread; | |
1618 | ||
1619 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
1620 | msleep(1); | |
1621 | kthread_stop(test_thread); | |
1622 | } | |
1623 | ||
1624 | /* | |
1625 | * For every trace event defined, we will test each trace point separately, | |
1626 | * and then by groups, and finally all trace points. | |
1627 | */ | |
9ea21c1e | 1628 | static __init void event_trace_self_tests(void) |
e6187007 SR |
1629 | { |
1630 | struct ftrace_event_call *call; | |
1631 | struct event_subsystem *system; | |
e6187007 SR |
1632 | int ret; |
1633 | ||
1634 | pr_info("Running tests on trace events:\n"); | |
1635 | ||
1636 | list_for_each_entry(call, &ftrace_events, list) { | |
1637 | ||
2239291a SR |
1638 | /* Only test those that have a probe */ |
1639 | if (!call->class || !call->class->probe) | |
e6187007 SR |
1640 | continue; |
1641 | ||
1f5a6b45 SR |
1642 | /* |
1643 | * Testing syscall events here is pretty useless, but | |
1644 | * we still do it if configured. But this is time consuming. | |
1645 | * What we really need is a user thread to perform the | |
1646 | * syscalls as we test. | |
1647 | */ | |
1648 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
1649 | if (call->class->system && |
1650 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
1651 | continue; |
1652 | #endif | |
1653 | ||
e6187007 SR |
1654 | pr_info("Testing event %s: ", call->name); |
1655 | ||
1656 | /* | |
1657 | * If an event is already enabled, someone is using | |
1658 | * it and the self test should not be on. | |
1659 | */ | |
553552ce | 1660 | if (call->flags & TRACE_EVENT_FL_ENABLED) { |
e6187007 SR |
1661 | pr_warning("Enabled event during self test!\n"); |
1662 | WARN_ON_ONCE(1); | |
1663 | continue; | |
1664 | } | |
1665 | ||
0e907c99 | 1666 | ftrace_event_enable_disable(call, 1); |
e6187007 | 1667 | event_test_stuff(); |
0e907c99 | 1668 | ftrace_event_enable_disable(call, 0); |
e6187007 SR |
1669 | |
1670 | pr_cont("OK\n"); | |
1671 | } | |
1672 | ||
1673 | /* Now test at the sub system level */ | |
1674 | ||
1675 | pr_info("Running tests on trace event systems:\n"); | |
1676 | ||
1677 | list_for_each_entry(system, &event_subsystems, list) { | |
1678 | ||
1679 | /* the ftrace system is special, skip it */ | |
1680 | if (strcmp(system->name, "ftrace") == 0) | |
1681 | continue; | |
1682 | ||
1683 | pr_info("Testing event system %s: ", system->name); | |
1684 | ||
8f31bfe5 | 1685 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1); |
e6187007 SR |
1686 | if (WARN_ON_ONCE(ret)) { |
1687 | pr_warning("error enabling system %s\n", | |
1688 | system->name); | |
1689 | continue; | |
1690 | } | |
1691 | ||
1692 | event_test_stuff(); | |
1693 | ||
8f31bfe5 | 1694 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0); |
76bab1b7 | 1695 | if (WARN_ON_ONCE(ret)) { |
e6187007 SR |
1696 | pr_warning("error disabling system %s\n", |
1697 | system->name); | |
76bab1b7 YL |
1698 | continue; |
1699 | } | |
e6187007 SR |
1700 | |
1701 | pr_cont("OK\n"); | |
1702 | } | |
1703 | ||
1704 | /* Test with all events enabled */ | |
1705 | ||
1706 | pr_info("Running tests on all trace events:\n"); | |
1707 | pr_info("Testing all events: "); | |
1708 | ||
8f31bfe5 | 1709 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1); |
e6187007 | 1710 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 1711 | pr_warning("error enabling all events\n"); |
9ea21c1e | 1712 | return; |
e6187007 SR |
1713 | } |
1714 | ||
1715 | event_test_stuff(); | |
1716 | ||
1717 | /* reset sysname */ | |
8f31bfe5 | 1718 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0); |
e6187007 SR |
1719 | if (WARN_ON_ONCE(ret)) { |
1720 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 1721 | return; |
e6187007 SR |
1722 | } |
1723 | ||
1724 | pr_cont("OK\n"); | |
9ea21c1e SR |
1725 | } |
1726 | ||
1727 | #ifdef CONFIG_FUNCTION_TRACER | |
1728 | ||
245b2e70 | 1729 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e SR |
1730 | |
1731 | static void | |
2f5f6ad9 | 1732 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 1733 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
9ea21c1e SR |
1734 | { |
1735 | struct ring_buffer_event *event; | |
e77405ad | 1736 | struct ring_buffer *buffer; |
9ea21c1e SR |
1737 | struct ftrace_entry *entry; |
1738 | unsigned long flags; | |
1739 | long disabled; | |
9ea21c1e SR |
1740 | int cpu; |
1741 | int pc; | |
1742 | ||
1743 | pc = preempt_count(); | |
5168ae50 | 1744 | preempt_disable_notrace(); |
9ea21c1e | 1745 | cpu = raw_smp_processor_id(); |
245b2e70 | 1746 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
1747 | |
1748 | if (disabled != 1) | |
1749 | goto out; | |
1750 | ||
1751 | local_save_flags(flags); | |
1752 | ||
e77405ad SR |
1753 | event = trace_current_buffer_lock_reserve(&buffer, |
1754 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
1755 | flags, pc); |
1756 | if (!event) | |
1757 | goto out; | |
1758 | entry = ring_buffer_event_data(event); | |
1759 | entry->ip = ip; | |
1760 | entry->parent_ip = parent_ip; | |
1761 | ||
0d5c6e1c | 1762 | trace_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
1763 | |
1764 | out: | |
245b2e70 | 1765 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 1766 | preempt_enable_notrace(); |
9ea21c1e SR |
1767 | } |
1768 | ||
1769 | static struct ftrace_ops trace_ops __initdata = | |
1770 | { | |
1771 | .func = function_test_events_call, | |
4740974a | 1772 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
9ea21c1e SR |
1773 | }; |
1774 | ||
1775 | static __init void event_trace_self_test_with_function(void) | |
1776 | { | |
17bb615a SR |
1777 | int ret; |
1778 | ret = register_ftrace_function(&trace_ops); | |
1779 | if (WARN_ON(ret < 0)) { | |
1780 | pr_info("Failed to enable function tracer for event tests\n"); | |
1781 | return; | |
1782 | } | |
9ea21c1e SR |
1783 | pr_info("Running tests again, along with the function tracer\n"); |
1784 | event_trace_self_tests(); | |
1785 | unregister_ftrace_function(&trace_ops); | |
1786 | } | |
1787 | #else | |
1788 | static __init void event_trace_self_test_with_function(void) | |
1789 | { | |
1790 | } | |
1791 | #endif | |
1792 | ||
1793 | static __init int event_trace_self_tests_init(void) | |
1794 | { | |
020e5f85 LZ |
1795 | if (!tracing_selftest_disabled) { |
1796 | event_trace_self_tests(); | |
1797 | event_trace_self_test_with_function(); | |
1798 | } | |
e6187007 SR |
1799 | |
1800 | return 0; | |
1801 | } | |
1802 | ||
28d20e2d | 1803 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
1804 | |
1805 | #endif |