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 | ||
9b63776f SR |
297 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
298 | continue; | |
299 | ||
8f31bfe5 LZ |
300 | if (match && |
301 | strcmp(match, call->name) != 0 && | |
8f082018 | 302 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
303 | continue; |
304 | ||
8f082018 | 305 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
306 | continue; |
307 | ||
308 | if (event && strcmp(event, call->name) != 0) | |
309 | continue; | |
310 | ||
311 | ftrace_event_enable_disable(call, set); | |
312 | ||
313 | ret = 0; | |
314 | } | |
315 | mutex_unlock(&event_mutex); | |
316 | ||
317 | return ret; | |
318 | } | |
319 | ||
320 | static int ftrace_set_clr_event(char *buf, int set) | |
321 | { | |
b628b3e6 | 322 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
323 | |
324 | /* | |
325 | * The buf format can be <subsystem>:<event-name> | |
326 | * *:<event-name> means any event by that name. | |
327 | * :<event-name> is the same. | |
328 | * | |
329 | * <subsystem>:* means all events in that subsystem | |
330 | * <subsystem>: means the same. | |
331 | * | |
332 | * <name> (no ':') means all events in a subsystem with | |
333 | * the name <name> or any event that matches <name> | |
334 | */ | |
335 | ||
336 | match = strsep(&buf, ":"); | |
337 | if (buf) { | |
338 | sub = match; | |
339 | event = buf; | |
340 | match = NULL; | |
341 | ||
342 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
343 | sub = NULL; | |
344 | if (!strlen(event) || strcmp(event, "*") == 0) | |
345 | event = NULL; | |
346 | } | |
b77e38aa | 347 | |
8f31bfe5 | 348 | return __ftrace_set_clr_event(match, sub, event, set); |
b77e38aa SR |
349 | } |
350 | ||
4671c794 SR |
351 | /** |
352 | * trace_set_clr_event - enable or disable an event | |
353 | * @system: system name to match (NULL for any system) | |
354 | * @event: event name to match (NULL for all events, within system) | |
355 | * @set: 1 to enable, 0 to disable | |
356 | * | |
357 | * This is a way for other parts of the kernel to enable or disable | |
358 | * event recording. | |
359 | * | |
360 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
361 | * registered events. | |
362 | */ | |
363 | int trace_set_clr_event(const char *system, const char *event, int set) | |
364 | { | |
365 | return __ftrace_set_clr_event(NULL, system, event, set); | |
366 | } | |
56355b83 | 367 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 368 | |
b77e38aa SR |
369 | /* 128 should be much more than enough */ |
370 | #define EVENT_BUF_SIZE 127 | |
371 | ||
372 | static ssize_t | |
373 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
374 | size_t cnt, loff_t *ppos) | |
375 | { | |
48966364 | 376 | struct trace_parser parser; |
4ba7978e | 377 | ssize_t read, ret; |
b77e38aa | 378 | |
4ba7978e | 379 | if (!cnt) |
b77e38aa SR |
380 | return 0; |
381 | ||
1852fcce SR |
382 | ret = tracing_update_buffers(); |
383 | if (ret < 0) | |
384 | return ret; | |
385 | ||
48966364 | 386 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
387 | return -ENOMEM; |
388 | ||
48966364 | 389 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
390 | ||
4ba7978e | 391 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 392 | int set = 1; |
b77e38aa | 393 | |
48966364 | 394 | if (*parser.buffer == '!') |
b77e38aa | 395 | set = 0; |
b77e38aa | 396 | |
48966364 | 397 | parser.buffer[parser.idx] = 0; |
398 | ||
399 | ret = ftrace_set_clr_event(parser.buffer + !set, set); | |
b77e38aa | 400 | if (ret) |
48966364 | 401 | goto out_put; |
b77e38aa | 402 | } |
b77e38aa SR |
403 | |
404 | ret = read; | |
405 | ||
48966364 | 406 | out_put: |
407 | trace_parser_put(&parser); | |
b77e38aa SR |
408 | |
409 | return ret; | |
410 | } | |
411 | ||
412 | static void * | |
413 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
414 | { | |
30bd39cd | 415 | struct ftrace_event_call *call = v; |
b77e38aa SR |
416 | |
417 | (*pos)++; | |
418 | ||
30bd39cd | 419 | list_for_each_entry_continue(call, &ftrace_events, list) { |
40e26815 SR |
420 | /* |
421 | * The ftrace subsystem is for showing formats only. | |
422 | * They can not be enabled or disabled via the event files. | |
423 | */ | |
a1d0ce82 | 424 | if (call->class && call->class->reg) |
30bd39cd | 425 | return call; |
40e26815 | 426 | } |
b77e38aa | 427 | |
30bd39cd | 428 | return NULL; |
b77e38aa SR |
429 | } |
430 | ||
431 | static void *t_start(struct seq_file *m, loff_t *pos) | |
432 | { | |
30bd39cd | 433 | struct ftrace_event_call *call; |
e1c7e2a6 LZ |
434 | loff_t l; |
435 | ||
20c8928a | 436 | mutex_lock(&event_mutex); |
e1c7e2a6 | 437 | |
30bd39cd | 438 | call = list_entry(&ftrace_events, struct ftrace_event_call, list); |
e1c7e2a6 | 439 | for (l = 0; l <= *pos; ) { |
30bd39cd | 440 | call = t_next(m, call, &l); |
e1c7e2a6 LZ |
441 | if (!call) |
442 | break; | |
443 | } | |
444 | return call; | |
b77e38aa SR |
445 | } |
446 | ||
447 | static void * | |
448 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
449 | { | |
30bd39cd | 450 | struct ftrace_event_call *call = v; |
b77e38aa SR |
451 | |
452 | (*pos)++; | |
453 | ||
30bd39cd | 454 | list_for_each_entry_continue(call, &ftrace_events, list) { |
553552ce | 455 | if (call->flags & TRACE_EVENT_FL_ENABLED) |
30bd39cd | 456 | return call; |
b77e38aa SR |
457 | } |
458 | ||
30bd39cd | 459 | return NULL; |
b77e38aa SR |
460 | } |
461 | ||
462 | static void *s_start(struct seq_file *m, loff_t *pos) | |
463 | { | |
30bd39cd | 464 | struct ftrace_event_call *call; |
e1c7e2a6 LZ |
465 | loff_t l; |
466 | ||
20c8928a | 467 | mutex_lock(&event_mutex); |
e1c7e2a6 | 468 | |
30bd39cd | 469 | call = list_entry(&ftrace_events, struct ftrace_event_call, list); |
e1c7e2a6 | 470 | for (l = 0; l <= *pos; ) { |
30bd39cd | 471 | call = s_next(m, call, &l); |
e1c7e2a6 LZ |
472 | if (!call) |
473 | break; | |
474 | } | |
475 | return call; | |
b77e38aa SR |
476 | } |
477 | ||
478 | static int t_show(struct seq_file *m, void *v) | |
479 | { | |
480 | struct ftrace_event_call *call = v; | |
481 | ||
8f082018 SR |
482 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
483 | seq_printf(m, "%s:", call->class->system); | |
b77e38aa SR |
484 | seq_printf(m, "%s\n", call->name); |
485 | ||
486 | return 0; | |
487 | } | |
488 | ||
489 | static void t_stop(struct seq_file *m, void *p) | |
490 | { | |
20c8928a | 491 | mutex_unlock(&event_mutex); |
b77e38aa SR |
492 | } |
493 | ||
494 | static int | |
495 | ftrace_event_seq_open(struct inode *inode, struct file *file) | |
496 | { | |
b77e38aa SR |
497 | const struct seq_operations *seq_ops; |
498 | ||
499 | if ((file->f_mode & FMODE_WRITE) && | |
8650ae32 | 500 | (file->f_flags & O_TRUNC)) |
b77e38aa SR |
501 | ftrace_clear_events(); |
502 | ||
503 | seq_ops = inode->i_private; | |
20c8928a | 504 | return seq_open(file, seq_ops); |
b77e38aa SR |
505 | } |
506 | ||
1473e441 SR |
507 | static ssize_t |
508 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
509 | loff_t *ppos) | |
510 | { | |
511 | struct ftrace_event_call *call = filp->private_data; | |
512 | char *buf; | |
513 | ||
553552ce | 514 | if (call->flags & TRACE_EVENT_FL_ENABLED) |
1473e441 SR |
515 | buf = "1\n"; |
516 | else | |
517 | buf = "0\n"; | |
518 | ||
519 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
520 | } | |
521 | ||
522 | static ssize_t | |
523 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
524 | loff_t *ppos) | |
525 | { | |
526 | struct ftrace_event_call *call = filp->private_data; | |
1473e441 SR |
527 | unsigned long val; |
528 | int ret; | |
529 | ||
22fe9b54 PH |
530 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
531 | if (ret) | |
1473e441 SR |
532 | return ret; |
533 | ||
1852fcce SR |
534 | ret = tracing_update_buffers(); |
535 | if (ret < 0) | |
536 | return ret; | |
537 | ||
1473e441 SR |
538 | switch (val) { |
539 | case 0: | |
1473e441 | 540 | case 1: |
11a241a3 | 541 | mutex_lock(&event_mutex); |
3b8e4273 | 542 | ret = ftrace_event_enable_disable(call, val); |
11a241a3 | 543 | mutex_unlock(&event_mutex); |
1473e441 SR |
544 | break; |
545 | ||
546 | default: | |
547 | return -EINVAL; | |
548 | } | |
549 | ||
550 | *ppos += cnt; | |
551 | ||
3b8e4273 | 552 | return ret ? ret : cnt; |
1473e441 SR |
553 | } |
554 | ||
8ae79a13 SR |
555 | static ssize_t |
556 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
557 | loff_t *ppos) | |
558 | { | |
c142b15d | 559 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
40ee4dff | 560 | struct event_subsystem *system = filp->private_data; |
8ae79a13 SR |
561 | struct ftrace_event_call *call; |
562 | char buf[2]; | |
c142b15d | 563 | int set = 0; |
8ae79a13 SR |
564 | int ret; |
565 | ||
8ae79a13 SR |
566 | mutex_lock(&event_mutex); |
567 | list_for_each_entry(call, &ftrace_events, list) { | |
a1d0ce82 | 568 | if (!call->name || !call->class || !call->class->reg) |
8ae79a13 SR |
569 | continue; |
570 | ||
40ee4dff | 571 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
572 | continue; |
573 | ||
574 | /* | |
575 | * We need to find out if all the events are set | |
576 | * or if all events or cleared, or if we have | |
577 | * a mixture. | |
578 | */ | |
553552ce | 579 | set |= (1 << !!(call->flags & TRACE_EVENT_FL_ENABLED)); |
c142b15d | 580 | |
8ae79a13 SR |
581 | /* |
582 | * If we have a mixture, no need to look further. | |
583 | */ | |
c142b15d | 584 | if (set == 3) |
8ae79a13 SR |
585 | break; |
586 | } | |
587 | mutex_unlock(&event_mutex); | |
588 | ||
c142b15d | 589 | buf[0] = set_to_char[set]; |
8ae79a13 | 590 | buf[1] = '\n'; |
8ae79a13 SR |
591 | |
592 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
593 | ||
594 | return ret; | |
595 | } | |
596 | ||
597 | static ssize_t | |
598 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
599 | loff_t *ppos) | |
600 | { | |
40ee4dff SR |
601 | struct event_subsystem *system = filp->private_data; |
602 | const char *name = NULL; | |
8ae79a13 | 603 | unsigned long val; |
8ae79a13 SR |
604 | ssize_t ret; |
605 | ||
22fe9b54 PH |
606 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
607 | if (ret) | |
8ae79a13 SR |
608 | return ret; |
609 | ||
610 | ret = tracing_update_buffers(); | |
611 | if (ret < 0) | |
612 | return ret; | |
613 | ||
8f31bfe5 | 614 | if (val != 0 && val != 1) |
8ae79a13 | 615 | return -EINVAL; |
8ae79a13 | 616 | |
40ee4dff SR |
617 | /* |
618 | * Opening of "enable" adds a ref count to system, | |
619 | * so the name is safe to use. | |
620 | */ | |
621 | if (system) | |
622 | name = system->name; | |
623 | ||
624 | ret = __ftrace_set_clr_event(NULL, name, NULL, val); | |
8ae79a13 | 625 | if (ret) |
8f31bfe5 | 626 | goto out; |
8ae79a13 SR |
627 | |
628 | ret = cnt; | |
629 | ||
8f31bfe5 | 630 | out: |
8ae79a13 SR |
631 | *ppos += cnt; |
632 | ||
633 | return ret; | |
634 | } | |
635 | ||
2a37a3df SR |
636 | enum { |
637 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
638 | FORMAT_FIELD_SEPERATOR = 2, |
639 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
640 | }; |
641 | ||
642 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 643 | { |
2a37a3df | 644 | struct ftrace_event_call *call = m->private; |
5a65e956 | 645 | struct ftrace_event_field *field; |
86397dc3 LZ |
646 | struct list_head *common_head = &ftrace_common_fields; |
647 | struct list_head *head = trace_get_fields(call); | |
981d081e | 648 | |
2a37a3df | 649 | (*pos)++; |
5a65e956 | 650 | |
2a37a3df SR |
651 | switch ((unsigned long)v) { |
652 | case FORMAT_HEADER: | |
86397dc3 LZ |
653 | if (unlikely(list_empty(common_head))) |
654 | return NULL; | |
655 | ||
656 | field = list_entry(common_head->prev, | |
657 | struct ftrace_event_field, link); | |
658 | return field; | |
5a65e956 | 659 | |
86397dc3 | 660 | case FORMAT_FIELD_SEPERATOR: |
2a37a3df SR |
661 | if (unlikely(list_empty(head))) |
662 | return NULL; | |
5a65e956 | 663 | |
2a37a3df SR |
664 | field = list_entry(head->prev, struct ftrace_event_field, link); |
665 | return field; | |
5a65e956 | 666 | |
2a37a3df SR |
667 | case FORMAT_PRINTFMT: |
668 | /* all done */ | |
669 | return NULL; | |
5a65e956 LJ |
670 | } |
671 | ||
2a37a3df | 672 | field = v; |
86397dc3 LZ |
673 | if (field->link.prev == common_head) |
674 | return (void *)FORMAT_FIELD_SEPERATOR; | |
675 | else if (field->link.prev == head) | |
2a37a3df SR |
676 | return (void *)FORMAT_PRINTFMT; |
677 | ||
678 | field = list_entry(field->link.prev, struct ftrace_event_field, link); | |
679 | ||
2a37a3df | 680 | return field; |
8728fe50 | 681 | } |
5a65e956 | 682 | |
2a37a3df | 683 | static void *f_start(struct seq_file *m, loff_t *pos) |
8728fe50 | 684 | { |
2a37a3df SR |
685 | loff_t l = 0; |
686 | void *p; | |
5a65e956 | 687 | |
2a37a3df SR |
688 | /* Start by showing the header */ |
689 | if (!*pos) | |
690 | return (void *)FORMAT_HEADER; | |
691 | ||
692 | p = (void *)FORMAT_HEADER; | |
693 | do { | |
694 | p = f_next(m, p, &l); | |
695 | } while (p && l < *pos); | |
696 | ||
697 | return p; | |
698 | } | |
699 | ||
700 | static int f_show(struct seq_file *m, void *v) | |
701 | { | |
702 | struct ftrace_event_call *call = m->private; | |
703 | struct ftrace_event_field *field; | |
704 | const char *array_descriptor; | |
705 | ||
706 | switch ((unsigned long)v) { | |
707 | case FORMAT_HEADER: | |
708 | seq_printf(m, "name: %s\n", call->name); | |
709 | seq_printf(m, "ID: %d\n", call->event.type); | |
710 | seq_printf(m, "format:\n"); | |
8728fe50 | 711 | return 0; |
5a65e956 | 712 | |
86397dc3 LZ |
713 | case FORMAT_FIELD_SEPERATOR: |
714 | seq_putc(m, '\n'); | |
715 | return 0; | |
716 | ||
2a37a3df SR |
717 | case FORMAT_PRINTFMT: |
718 | seq_printf(m, "\nprint fmt: %s\n", | |
719 | call->print_fmt); | |
720 | return 0; | |
981d081e | 721 | } |
8728fe50 | 722 | |
2a37a3df | 723 | field = v; |
8728fe50 | 724 | |
2a37a3df SR |
725 | /* |
726 | * Smartly shows the array type(except dynamic array). | |
727 | * Normal: | |
728 | * field:TYPE VAR | |
729 | * If TYPE := TYPE[LEN], it is shown: | |
730 | * field:TYPE VAR[LEN] | |
731 | */ | |
732 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 733 | |
2a37a3df SR |
734 | if (!strncmp(field->type, "__data_loc", 10)) |
735 | array_descriptor = NULL; | |
8728fe50 | 736 | |
2a37a3df SR |
737 | if (!array_descriptor) |
738 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
739 | field->type, field->name, field->offset, | |
740 | field->size, !!field->is_signed); | |
741 | else | |
742 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
743 | (int)(array_descriptor - field->type), | |
744 | field->type, field->name, | |
745 | array_descriptor, field->offset, | |
746 | field->size, !!field->is_signed); | |
8728fe50 | 747 | |
2a37a3df SR |
748 | return 0; |
749 | } | |
5a65e956 | 750 | |
2a37a3df SR |
751 | static void f_stop(struct seq_file *m, void *p) |
752 | { | |
753 | } | |
981d081e | 754 | |
2a37a3df SR |
755 | static const struct seq_operations trace_format_seq_ops = { |
756 | .start = f_start, | |
757 | .next = f_next, | |
758 | .stop = f_stop, | |
759 | .show = f_show, | |
760 | }; | |
761 | ||
762 | static int trace_format_open(struct inode *inode, struct file *file) | |
763 | { | |
764 | struct ftrace_event_call *call = inode->i_private; | |
765 | struct seq_file *m; | |
766 | int ret; | |
767 | ||
768 | ret = seq_open(file, &trace_format_seq_ops); | |
769 | if (ret < 0) | |
770 | return ret; | |
771 | ||
772 | m = file->private_data; | |
773 | m->private = call; | |
774 | ||
775 | return 0; | |
981d081e SR |
776 | } |
777 | ||
23725aee PZ |
778 | static ssize_t |
779 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
780 | { | |
781 | struct ftrace_event_call *call = filp->private_data; | |
782 | struct trace_seq *s; | |
783 | int r; | |
784 | ||
785 | if (*ppos) | |
786 | return 0; | |
787 | ||
788 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
789 | if (!s) | |
790 | return -ENOMEM; | |
791 | ||
792 | trace_seq_init(s); | |
32c0edae | 793 | trace_seq_printf(s, "%d\n", call->event.type); |
23725aee PZ |
794 | |
795 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
796 | s->buffer, s->len); | |
797 | kfree(s); | |
798 | return r; | |
799 | } | |
800 | ||
7ce7e424 TZ |
801 | static ssize_t |
802 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
803 | loff_t *ppos) | |
804 | { | |
805 | struct ftrace_event_call *call = filp->private_data; | |
806 | struct trace_seq *s; | |
807 | int r; | |
808 | ||
809 | if (*ppos) | |
810 | return 0; | |
811 | ||
812 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
813 | if (!s) | |
814 | return -ENOMEM; | |
815 | ||
816 | trace_seq_init(s); | |
817 | ||
8b372562 | 818 | print_event_filter(call, s); |
4bda2d51 | 819 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
820 | |
821 | kfree(s); | |
822 | ||
823 | return r; | |
824 | } | |
825 | ||
826 | static ssize_t | |
827 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
828 | loff_t *ppos) | |
829 | { | |
830 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 831 | char *buf; |
7ce7e424 TZ |
832 | int err; |
833 | ||
8b372562 | 834 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
835 | return -EINVAL; |
836 | ||
8b372562 TZ |
837 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
838 | if (!buf) | |
7ce7e424 TZ |
839 | return -ENOMEM; |
840 | ||
8b372562 TZ |
841 | if (copy_from_user(buf, ubuf, cnt)) { |
842 | free_page((unsigned long) buf); | |
843 | return -EFAULT; | |
7ce7e424 | 844 | } |
8b372562 | 845 | buf[cnt] = '\0'; |
7ce7e424 | 846 | |
8b372562 TZ |
847 | err = apply_event_filter(call, buf); |
848 | free_page((unsigned long) buf); | |
849 | if (err < 0) | |
44e9c8b7 | 850 | return err; |
0a19e53c | 851 | |
7ce7e424 TZ |
852 | *ppos += cnt; |
853 | ||
854 | return cnt; | |
855 | } | |
856 | ||
e9dbfae5 SR |
857 | static LIST_HEAD(event_subsystems); |
858 | ||
859 | static int subsystem_open(struct inode *inode, struct file *filp) | |
860 | { | |
861 | struct event_subsystem *system = NULL; | |
862 | int ret; | |
863 | ||
40ee4dff SR |
864 | if (!inode->i_private) |
865 | goto skip_search; | |
866 | ||
e9dbfae5 SR |
867 | /* Make sure the system still exists */ |
868 | mutex_lock(&event_mutex); | |
869 | list_for_each_entry(system, &event_subsystems, list) { | |
870 | if (system == inode->i_private) { | |
871 | /* Don't open systems with no events */ | |
872 | if (!system->nr_events) { | |
873 | system = NULL; | |
874 | break; | |
875 | } | |
876 | __get_system(system); | |
877 | break; | |
878 | } | |
879 | } | |
880 | mutex_unlock(&event_mutex); | |
881 | ||
882 | if (system != inode->i_private) | |
883 | return -ENODEV; | |
884 | ||
40ee4dff | 885 | skip_search: |
e9dbfae5 | 886 | ret = tracing_open_generic(inode, filp); |
40ee4dff | 887 | if (ret < 0 && system) |
e9dbfae5 SR |
888 | put_system(system); |
889 | ||
890 | return ret; | |
891 | } | |
892 | ||
893 | static int subsystem_release(struct inode *inode, struct file *file) | |
894 | { | |
895 | struct event_subsystem *system = inode->i_private; | |
896 | ||
40ee4dff SR |
897 | if (system) |
898 | put_system(system); | |
e9dbfae5 SR |
899 | |
900 | return 0; | |
901 | } | |
902 | ||
cfb180f3 TZ |
903 | static ssize_t |
904 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
905 | loff_t *ppos) | |
906 | { | |
907 | struct event_subsystem *system = filp->private_data; | |
908 | struct trace_seq *s; | |
909 | int r; | |
910 | ||
911 | if (*ppos) | |
912 | return 0; | |
913 | ||
914 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
915 | if (!s) | |
916 | return -ENOMEM; | |
917 | ||
918 | trace_seq_init(s); | |
919 | ||
8b372562 | 920 | print_subsystem_event_filter(system, s); |
4bda2d51 | 921 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
922 | |
923 | kfree(s); | |
924 | ||
925 | return r; | |
926 | } | |
927 | ||
928 | static ssize_t | |
929 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
930 | loff_t *ppos) | |
931 | { | |
932 | struct event_subsystem *system = filp->private_data; | |
8b372562 | 933 | char *buf; |
cfb180f3 TZ |
934 | int err; |
935 | ||
8b372562 | 936 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
937 | return -EINVAL; |
938 | ||
8b372562 TZ |
939 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
940 | if (!buf) | |
cfb180f3 TZ |
941 | return -ENOMEM; |
942 | ||
8b372562 TZ |
943 | if (copy_from_user(buf, ubuf, cnt)) { |
944 | free_page((unsigned long) buf); | |
945 | return -EFAULT; | |
cfb180f3 | 946 | } |
8b372562 | 947 | buf[cnt] = '\0'; |
cfb180f3 | 948 | |
8b372562 TZ |
949 | err = apply_subsystem_event_filter(system, buf); |
950 | free_page((unsigned long) buf); | |
951 | if (err < 0) | |
44e9c8b7 | 952 | return err; |
cfb180f3 TZ |
953 | |
954 | *ppos += cnt; | |
955 | ||
956 | return cnt; | |
957 | } | |
958 | ||
d1b182a8 SR |
959 | static ssize_t |
960 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
961 | { | |
962 | int (*func)(struct trace_seq *s) = filp->private_data; | |
963 | struct trace_seq *s; | |
964 | int r; | |
965 | ||
966 | if (*ppos) | |
967 | return 0; | |
968 | ||
969 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
970 | if (!s) | |
971 | return -ENOMEM; | |
972 | ||
973 | trace_seq_init(s); | |
974 | ||
975 | func(s); | |
976 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
977 | ||
978 | kfree(s); | |
979 | ||
980 | return r; | |
981 | } | |
982 | ||
b77e38aa SR |
983 | static const struct seq_operations show_event_seq_ops = { |
984 | .start = t_start, | |
985 | .next = t_next, | |
986 | .show = t_show, | |
987 | .stop = t_stop, | |
988 | }; | |
989 | ||
990 | static const struct seq_operations show_set_event_seq_ops = { | |
991 | .start = s_start, | |
992 | .next = s_next, | |
993 | .show = t_show, | |
994 | .stop = t_stop, | |
995 | }; | |
996 | ||
2314c4ae SR |
997 | static const struct file_operations ftrace_avail_fops = { |
998 | .open = ftrace_event_seq_open, | |
999 | .read = seq_read, | |
1000 | .llseek = seq_lseek, | |
1001 | .release = seq_release, | |
1002 | }; | |
1003 | ||
b77e38aa SR |
1004 | static const struct file_operations ftrace_set_event_fops = { |
1005 | .open = ftrace_event_seq_open, | |
1006 | .read = seq_read, | |
1007 | .write = ftrace_event_write, | |
1008 | .llseek = seq_lseek, | |
1009 | .release = seq_release, | |
1010 | }; | |
1011 | ||
1473e441 SR |
1012 | static const struct file_operations ftrace_enable_fops = { |
1013 | .open = tracing_open_generic, | |
1014 | .read = event_enable_read, | |
1015 | .write = event_enable_write, | |
6038f373 | 1016 | .llseek = default_llseek, |
1473e441 SR |
1017 | }; |
1018 | ||
981d081e | 1019 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
1020 | .open = trace_format_open, |
1021 | .read = seq_read, | |
1022 | .llseek = seq_lseek, | |
1023 | .release = seq_release, | |
981d081e SR |
1024 | }; |
1025 | ||
23725aee PZ |
1026 | static const struct file_operations ftrace_event_id_fops = { |
1027 | .open = tracing_open_generic, | |
1028 | .read = event_id_read, | |
6038f373 | 1029 | .llseek = default_llseek, |
23725aee PZ |
1030 | }; |
1031 | ||
7ce7e424 TZ |
1032 | static const struct file_operations ftrace_event_filter_fops = { |
1033 | .open = tracing_open_generic, | |
1034 | .read = event_filter_read, | |
1035 | .write = event_filter_write, | |
6038f373 | 1036 | .llseek = default_llseek, |
7ce7e424 TZ |
1037 | }; |
1038 | ||
cfb180f3 | 1039 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 1040 | .open = subsystem_open, |
cfb180f3 TZ |
1041 | .read = subsystem_filter_read, |
1042 | .write = subsystem_filter_write, | |
6038f373 | 1043 | .llseek = default_llseek, |
e9dbfae5 | 1044 | .release = subsystem_release, |
cfb180f3 TZ |
1045 | }; |
1046 | ||
8ae79a13 | 1047 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 1048 | .open = subsystem_open, |
8ae79a13 SR |
1049 | .read = system_enable_read, |
1050 | .write = system_enable_write, | |
6038f373 | 1051 | .llseek = default_llseek, |
40ee4dff | 1052 | .release = subsystem_release, |
8ae79a13 SR |
1053 | }; |
1054 | ||
d1b182a8 SR |
1055 | static const struct file_operations ftrace_show_header_fops = { |
1056 | .open = tracing_open_generic, | |
1057 | .read = show_header, | |
6038f373 | 1058 | .llseek = default_llseek, |
d1b182a8 SR |
1059 | }; |
1060 | ||
1473e441 SR |
1061 | static struct dentry *event_trace_events_dir(void) |
1062 | { | |
1063 | static struct dentry *d_tracer; | |
1064 | static struct dentry *d_events; | |
1065 | ||
1066 | if (d_events) | |
1067 | return d_events; | |
1068 | ||
1069 | d_tracer = tracing_init_dentry(); | |
1070 | if (!d_tracer) | |
1071 | return NULL; | |
1072 | ||
1073 | d_events = debugfs_create_dir("events", d_tracer); | |
1074 | if (!d_events) | |
1075 | pr_warning("Could not create debugfs " | |
1076 | "'events' directory\n"); | |
1077 | ||
1078 | return d_events; | |
1079 | } | |
1080 | ||
6ecc2d1c SR |
1081 | static struct dentry * |
1082 | event_subsystem_dir(const char *name, struct dentry *d_events) | |
1083 | { | |
1084 | struct event_subsystem *system; | |
e1112b4d | 1085 | struct dentry *entry; |
6ecc2d1c SR |
1086 | |
1087 | /* First see if we did not already create this dir */ | |
1088 | list_for_each_entry(system, &event_subsystems, list) { | |
dc82ec98 XG |
1089 | if (strcmp(system->name, name) == 0) { |
1090 | system->nr_events++; | |
6ecc2d1c | 1091 | return system->entry; |
dc82ec98 | 1092 | } |
6ecc2d1c SR |
1093 | } |
1094 | ||
1095 | /* need to create new entry */ | |
1096 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1097 | if (!system) { | |
1098 | pr_warning("No memory to create event subsystem %s\n", | |
1099 | name); | |
1100 | return d_events; | |
1101 | } | |
1102 | ||
1103 | system->entry = debugfs_create_dir(name, d_events); | |
1104 | if (!system->entry) { | |
1105 | pr_warning("Could not create event subsystem %s\n", | |
1106 | name); | |
1107 | kfree(system); | |
1108 | return d_events; | |
1109 | } | |
1110 | ||
dc82ec98 | 1111 | system->nr_events = 1; |
e9dbfae5 | 1112 | system->ref_count = 1; |
6d723736 SR |
1113 | system->name = kstrdup(name, GFP_KERNEL); |
1114 | if (!system->name) { | |
1115 | debugfs_remove(system->entry); | |
1116 | kfree(system); | |
1117 | return d_events; | |
1118 | } | |
1119 | ||
6ecc2d1c SR |
1120 | list_add(&system->list, &event_subsystems); |
1121 | ||
30e673b2 | 1122 | system->filter = NULL; |
cfb180f3 | 1123 | |
8b372562 TZ |
1124 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
1125 | if (!system->filter) { | |
1126 | pr_warning("Could not allocate filter for subsystem " | |
1127 | "'%s'\n", name); | |
1128 | return system->entry; | |
1129 | } | |
1130 | ||
e1112b4d TZ |
1131 | entry = debugfs_create_file("filter", 0644, system->entry, system, |
1132 | &ftrace_subsystem_filter_fops); | |
8b372562 TZ |
1133 | if (!entry) { |
1134 | kfree(system->filter); | |
1135 | system->filter = NULL; | |
e1112b4d TZ |
1136 | pr_warning("Could not create debugfs " |
1137 | "'%s/filter' entry\n", name); | |
8b372562 | 1138 | } |
e1112b4d | 1139 | |
40ee4dff | 1140 | trace_create_file("enable", 0644, system->entry, system, |
f3f3f009 | 1141 | &ftrace_system_enable_fops); |
8ae79a13 | 1142 | |
6ecc2d1c SR |
1143 | return system->entry; |
1144 | } | |
1145 | ||
1473e441 | 1146 | static int |
701970b3 SR |
1147 | event_create_dir(struct ftrace_event_call *call, struct dentry *d_events, |
1148 | const struct file_operations *id, | |
1149 | const struct file_operations *enable, | |
1150 | const struct file_operations *filter, | |
1151 | const struct file_operations *format) | |
1473e441 | 1152 | { |
2e33af02 | 1153 | struct list_head *head; |
fd994989 | 1154 | int ret; |
1473e441 | 1155 | |
6ecc2d1c SR |
1156 | /* |
1157 | * If the trace point header did not define TRACE_SYSTEM | |
1158 | * then the system would be called "TRACE_SYSTEM". | |
1159 | */ | |
8f082018 SR |
1160 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
1161 | d_events = event_subsystem_dir(call->class->system, d_events); | |
6ecc2d1c | 1162 | |
1473e441 SR |
1163 | call->dir = debugfs_create_dir(call->name, d_events); |
1164 | if (!call->dir) { | |
1165 | pr_warning("Could not create debugfs " | |
1166 | "'%s' directory\n", call->name); | |
1167 | return -1; | |
1168 | } | |
1169 | ||
9b63776f | 1170 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
f3f3f009 FW |
1171 | trace_create_file("enable", 0644, call->dir, call, |
1172 | enable); | |
1473e441 | 1173 | |
2239291a | 1174 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 1175 | if (call->event.type && call->class->reg) |
f3f3f009 FW |
1176 | trace_create_file("id", 0444, call->dir, call, |
1177 | id); | |
2239291a | 1178 | #endif |
23725aee | 1179 | |
c9d932cf LZ |
1180 | /* |
1181 | * Other events may have the same class. Only update | |
1182 | * the fields if they are not already defined. | |
1183 | */ | |
1184 | head = trace_get_fields(call); | |
1185 | if (list_empty(head)) { | |
1186 | ret = call->class->define_fields(call); | |
1187 | if (ret < 0) { | |
1188 | pr_warning("Could not initialize trace point" | |
1189 | " events/%s\n", call->name); | |
1190 | return ret; | |
cf027f64 TZ |
1191 | } |
1192 | } | |
c9d932cf LZ |
1193 | trace_create_file("filter", 0644, call->dir, call, |
1194 | filter); | |
cf027f64 | 1195 | |
f3f3f009 FW |
1196 | trace_create_file("format", 0444, call->dir, call, |
1197 | format); | |
6d723736 SR |
1198 | |
1199 | return 0; | |
1200 | } | |
1201 | ||
8781915a EG |
1202 | static void event_remove(struct ftrace_event_call *call) |
1203 | { | |
1204 | ftrace_event_enable_disable(call, 0); | |
1205 | if (call->event.funcs) | |
1206 | __unregister_ftrace_event(&call->event); | |
1207 | list_del(&call->list); | |
1208 | } | |
1209 | ||
1210 | static int event_init(struct ftrace_event_call *call) | |
1211 | { | |
1212 | int ret = 0; | |
1213 | ||
1214 | if (WARN_ON(!call->name)) | |
1215 | return -EINVAL; | |
1216 | ||
1217 | if (call->class->raw_init) { | |
1218 | ret = call->class->raw_init(call); | |
1219 | if (ret < 0 && ret != -ENOSYS) | |
1220 | pr_warn("Could not initialize trace events/%s\n", | |
1221 | call->name); | |
1222 | } | |
1223 | ||
1224 | return ret; | |
1225 | } | |
1226 | ||
67ead0a6 LZ |
1227 | static int |
1228 | __trace_add_event_call(struct ftrace_event_call *call, struct module *mod, | |
1229 | const struct file_operations *id, | |
1230 | const struct file_operations *enable, | |
1231 | const struct file_operations *filter, | |
1232 | const struct file_operations *format) | |
bd1a5c84 MH |
1233 | { |
1234 | struct dentry *d_events; | |
1235 | int ret; | |
6d723736 | 1236 | |
8781915a EG |
1237 | ret = event_init(call); |
1238 | if (ret < 0) | |
1239 | return ret; | |
701970b3 | 1240 | |
bd1a5c84 MH |
1241 | d_events = event_trace_events_dir(); |
1242 | if (!d_events) | |
1243 | return -ENOENT; | |
1244 | ||
67ead0a6 | 1245 | ret = event_create_dir(call, d_events, id, enable, filter, format); |
88f70d75 MH |
1246 | if (!ret) |
1247 | list_add(&call->list, &ftrace_events); | |
67ead0a6 | 1248 | call->mod = mod; |
88f70d75 | 1249 | |
588bebb7 | 1250 | return ret; |
bd1a5c84 MH |
1251 | } |
1252 | ||
1253 | /* Add an additional event_call dynamically */ | |
1254 | int trace_add_event_call(struct ftrace_event_call *call) | |
1255 | { | |
1256 | int ret; | |
1257 | mutex_lock(&event_mutex); | |
67ead0a6 LZ |
1258 | ret = __trace_add_event_call(call, NULL, &ftrace_event_id_fops, |
1259 | &ftrace_enable_fops, | |
1260 | &ftrace_event_filter_fops, | |
1261 | &ftrace_event_format_fops); | |
bd1a5c84 MH |
1262 | mutex_unlock(&event_mutex); |
1263 | return ret; | |
1264 | } | |
701970b3 | 1265 | |
a2ca5e03 FW |
1266 | static void remove_subsystem_dir(const char *name) |
1267 | { | |
1268 | struct event_subsystem *system; | |
1269 | ||
1270 | if (strcmp(name, TRACE_SYSTEM) == 0) | |
1271 | return; | |
1272 | ||
1273 | list_for_each_entry(system, &event_subsystems, list) { | |
1274 | if (strcmp(system->name, name) == 0) { | |
1275 | if (!--system->nr_events) { | |
a2ca5e03 FW |
1276 | debugfs_remove_recursive(system->entry); |
1277 | list_del(&system->list); | |
e9dbfae5 | 1278 | __put_system(system); |
a2ca5e03 FW |
1279 | } |
1280 | break; | |
1281 | } | |
1282 | } | |
1283 | } | |
1284 | ||
4fead8e4 MH |
1285 | /* |
1286 | * Must be called under locking both of event_mutex and trace_event_mutex. | |
1287 | */ | |
bd1a5c84 MH |
1288 | static void __trace_remove_event_call(struct ftrace_event_call *call) |
1289 | { | |
8781915a | 1290 | event_remove(call); |
bd1a5c84 MH |
1291 | trace_destroy_fields(call); |
1292 | destroy_preds(call); | |
8781915a | 1293 | debugfs_remove_recursive(call->dir); |
8f082018 | 1294 | remove_subsystem_dir(call->class->system); |
bd1a5c84 MH |
1295 | } |
1296 | ||
1297 | /* Remove an event_call */ | |
1298 | void trace_remove_event_call(struct ftrace_event_call *call) | |
1299 | { | |
1300 | mutex_lock(&event_mutex); | |
4fead8e4 | 1301 | down_write(&trace_event_mutex); |
bd1a5c84 | 1302 | __trace_remove_event_call(call); |
4fead8e4 | 1303 | up_write(&trace_event_mutex); |
bd1a5c84 MH |
1304 | mutex_unlock(&event_mutex); |
1305 | } | |
1306 | ||
1307 | #define for_each_event(event, start, end) \ | |
1308 | for (event = start; \ | |
1309 | (unsigned long)event < (unsigned long)end; \ | |
1310 | event++) | |
1311 | ||
1312 | #ifdef CONFIG_MODULES | |
1313 | ||
1314 | static LIST_HEAD(ftrace_module_file_list); | |
1315 | ||
1316 | /* | |
1317 | * Modules must own their file_operations to keep up with | |
1318 | * reference counting. | |
1319 | */ | |
1320 | struct ftrace_module_file_ops { | |
1321 | struct list_head list; | |
1322 | struct module *mod; | |
1323 | struct file_operations id; | |
1324 | struct file_operations enable; | |
1325 | struct file_operations format; | |
1326 | struct file_operations filter; | |
1327 | }; | |
1328 | ||
701970b3 SR |
1329 | static struct ftrace_module_file_ops * |
1330 | trace_create_file_ops(struct module *mod) | |
1331 | { | |
1332 | struct ftrace_module_file_ops *file_ops; | |
1333 | ||
1334 | /* | |
1335 | * This is a bit of a PITA. To allow for correct reference | |
1336 | * counting, modules must "own" their file_operations. | |
1337 | * To do this, we allocate the file operations that will be | |
1338 | * used in the event directory. | |
1339 | */ | |
1340 | ||
1341 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1342 | if (!file_ops) | |
1343 | return NULL; | |
1344 | ||
1345 | file_ops->mod = mod; | |
1346 | ||
1347 | file_ops->id = ftrace_event_id_fops; | |
1348 | file_ops->id.owner = mod; | |
1349 | ||
1350 | file_ops->enable = ftrace_enable_fops; | |
1351 | file_ops->enable.owner = mod; | |
1352 | ||
1353 | file_ops->filter = ftrace_event_filter_fops; | |
1354 | file_ops->filter.owner = mod; | |
1355 | ||
1356 | file_ops->format = ftrace_event_format_fops; | |
1357 | file_ops->format.owner = mod; | |
1358 | ||
1359 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1360 | ||
1361 | return file_ops; | |
1362 | } | |
1363 | ||
6d723736 SR |
1364 | static void trace_module_add_events(struct module *mod) |
1365 | { | |
701970b3 | 1366 | struct ftrace_module_file_ops *file_ops = NULL; |
e4a9ea5e | 1367 | struct ftrace_event_call **call, **start, **end; |
6d723736 SR |
1368 | |
1369 | start = mod->trace_events; | |
1370 | end = mod->trace_events + mod->num_trace_events; | |
1371 | ||
1372 | if (start == end) | |
1373 | return; | |
1374 | ||
67ead0a6 LZ |
1375 | file_ops = trace_create_file_ops(mod); |
1376 | if (!file_ops) | |
6d723736 SR |
1377 | return; |
1378 | ||
1379 | for_each_event(call, start, end) { | |
e4a9ea5e | 1380 | __trace_add_event_call(*call, mod, |
88f70d75 MH |
1381 | &file_ops->id, &file_ops->enable, |
1382 | &file_ops->filter, &file_ops->format); | |
6d723736 SR |
1383 | } |
1384 | } | |
1385 | ||
1386 | static void trace_module_remove_events(struct module *mod) | |
1387 | { | |
701970b3 | 1388 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1389 | struct ftrace_event_call *call, *p; |
9456f0fa | 1390 | bool found = false; |
6d723736 | 1391 | |
110bf2b7 | 1392 | down_write(&trace_event_mutex); |
6d723736 SR |
1393 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1394 | if (call->mod == mod) { | |
9456f0fa | 1395 | found = true; |
bd1a5c84 | 1396 | __trace_remove_event_call(call); |
6d723736 SR |
1397 | } |
1398 | } | |
701970b3 SR |
1399 | |
1400 | /* Now free the file_operations */ | |
1401 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1402 | if (file_ops->mod == mod) | |
1403 | break; | |
1404 | } | |
1405 | if (&file_ops->list != &ftrace_module_file_list) { | |
1406 | list_del(&file_ops->list); | |
1407 | kfree(file_ops); | |
1408 | } | |
9456f0fa SR |
1409 | |
1410 | /* | |
1411 | * It is safest to reset the ring buffer if the module being unloaded | |
1412 | * registered any events. | |
1413 | */ | |
1414 | if (found) | |
1415 | tracing_reset_current_online_cpus(); | |
110bf2b7 | 1416 | up_write(&trace_event_mutex); |
6d723736 SR |
1417 | } |
1418 | ||
61f919a1 SR |
1419 | static int trace_module_notify(struct notifier_block *self, |
1420 | unsigned long val, void *data) | |
6d723736 SR |
1421 | { |
1422 | struct module *mod = data; | |
1423 | ||
1424 | mutex_lock(&event_mutex); | |
1425 | switch (val) { | |
1426 | case MODULE_STATE_COMING: | |
1427 | trace_module_add_events(mod); | |
1428 | break; | |
1429 | case MODULE_STATE_GOING: | |
1430 | trace_module_remove_events(mod); | |
1431 | break; | |
1432 | } | |
1433 | mutex_unlock(&event_mutex); | |
fd994989 | 1434 | |
1473e441 SR |
1435 | return 0; |
1436 | } | |
61f919a1 SR |
1437 | #else |
1438 | static int trace_module_notify(struct notifier_block *self, | |
1439 | unsigned long val, void *data) | |
1440 | { | |
1441 | return 0; | |
1442 | } | |
1443 | #endif /* CONFIG_MODULES */ | |
1473e441 | 1444 | |
ec827c7e | 1445 | static struct notifier_block trace_module_nb = { |
6d723736 SR |
1446 | .notifier_call = trace_module_notify, |
1447 | .priority = 0, | |
1448 | }; | |
1449 | ||
e4a9ea5e SR |
1450 | extern struct ftrace_event_call *__start_ftrace_events[]; |
1451 | extern struct ftrace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 1452 | |
020e5f85 LZ |
1453 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
1454 | ||
1455 | static __init int setup_trace_event(char *str) | |
1456 | { | |
1457 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
1458 | ring_buffer_expanded = 1; | |
1459 | tracing_selftest_disabled = 1; | |
1460 | ||
1461 | return 1; | |
1462 | } | |
1463 | __setup("trace_event=", setup_trace_event); | |
1464 | ||
8781915a EG |
1465 | static __init int event_trace_enable(void) |
1466 | { | |
1467 | struct ftrace_event_call **iter, *call; | |
1468 | char *buf = bootup_event_buf; | |
1469 | char *token; | |
1470 | int ret; | |
1471 | ||
1472 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { | |
1473 | ||
1474 | call = *iter; | |
1475 | ret = event_init(call); | |
1476 | if (!ret) | |
1477 | list_add(&call->list, &ftrace_events); | |
1478 | } | |
1479 | ||
1480 | while (true) { | |
1481 | token = strsep(&buf, ","); | |
1482 | ||
1483 | if (!token) | |
1484 | break; | |
1485 | if (!*token) | |
1486 | continue; | |
1487 | ||
1488 | ret = ftrace_set_clr_event(token, 1); | |
1489 | if (ret) | |
1490 | pr_warn("Failed to enable trace event: %s\n", token); | |
1491 | } | |
1492 | return 0; | |
1493 | } | |
1494 | ||
b77e38aa SR |
1495 | static __init int event_trace_init(void) |
1496 | { | |
8781915a | 1497 | struct ftrace_event_call *call; |
b77e38aa SR |
1498 | struct dentry *d_tracer; |
1499 | struct dentry *entry; | |
1473e441 | 1500 | struct dentry *d_events; |
6d723736 | 1501 | int ret; |
b77e38aa SR |
1502 | |
1503 | d_tracer = tracing_init_dentry(); | |
1504 | if (!d_tracer) | |
1505 | return 0; | |
1506 | ||
2314c4ae SR |
1507 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
1508 | (void *)&show_event_seq_ops, | |
1509 | &ftrace_avail_fops); | |
1510 | if (!entry) | |
1511 | pr_warning("Could not create debugfs " | |
1512 | "'available_events' entry\n"); | |
1513 | ||
b77e38aa SR |
1514 | entry = debugfs_create_file("set_event", 0644, d_tracer, |
1515 | (void *)&show_set_event_seq_ops, | |
1516 | &ftrace_set_event_fops); | |
1517 | if (!entry) | |
1518 | pr_warning("Could not create debugfs " | |
1519 | "'set_event' entry\n"); | |
1520 | ||
1473e441 SR |
1521 | d_events = event_trace_events_dir(); |
1522 | if (!d_events) | |
1523 | return 0; | |
1524 | ||
d1b182a8 SR |
1525 | /* ring buffer internal formats */ |
1526 | trace_create_file("header_page", 0444, d_events, | |
1527 | ring_buffer_print_page_header, | |
1528 | &ftrace_show_header_fops); | |
1529 | ||
1530 | trace_create_file("header_event", 0444, d_events, | |
1531 | ring_buffer_print_entry_header, | |
1532 | &ftrace_show_header_fops); | |
1533 | ||
8ae79a13 | 1534 | trace_create_file("enable", 0644, d_events, |
8f31bfe5 | 1535 | NULL, &ftrace_system_enable_fops); |
8ae79a13 | 1536 | |
8728fe50 LZ |
1537 | if (trace_define_common_fields()) |
1538 | pr_warning("tracing: Failed to allocate common fields"); | |
1539 | ||
8781915a EG |
1540 | /* |
1541 | * Early initialization already enabled ftrace event. | |
1542 | * Now it's only necessary to create the event directory. | |
1543 | */ | |
1544 | list_for_each_entry(call, &ftrace_events, list) { | |
1545 | ||
1546 | ret = event_create_dir(call, d_events, | |
1547 | &ftrace_event_id_fops, | |
88f70d75 MH |
1548 | &ftrace_enable_fops, |
1549 | &ftrace_event_filter_fops, | |
1550 | &ftrace_event_format_fops); | |
8781915a EG |
1551 | if (ret < 0) |
1552 | event_remove(call); | |
020e5f85 LZ |
1553 | } |
1554 | ||
6d723736 | 1555 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 1556 | if (ret) |
6d723736 SR |
1557 | pr_warning("Failed to register trace events module notifier\n"); |
1558 | ||
b77e38aa SR |
1559 | return 0; |
1560 | } | |
8781915a | 1561 | core_initcall(event_trace_enable); |
b77e38aa | 1562 | fs_initcall(event_trace_init); |
e6187007 SR |
1563 | |
1564 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1565 | ||
1566 | static DEFINE_SPINLOCK(test_spinlock); | |
1567 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
1568 | static DEFINE_MUTEX(test_mutex); | |
1569 | ||
1570 | static __init void test_work(struct work_struct *dummy) | |
1571 | { | |
1572 | spin_lock(&test_spinlock); | |
1573 | spin_lock_irq(&test_spinlock_irq); | |
1574 | udelay(1); | |
1575 | spin_unlock_irq(&test_spinlock_irq); | |
1576 | spin_unlock(&test_spinlock); | |
1577 | ||
1578 | mutex_lock(&test_mutex); | |
1579 | msleep(1); | |
1580 | mutex_unlock(&test_mutex); | |
1581 | } | |
1582 | ||
1583 | static __init int event_test_thread(void *unused) | |
1584 | { | |
1585 | void *test_malloc; | |
1586 | ||
1587 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
1588 | if (!test_malloc) | |
1589 | pr_info("failed to kmalloc\n"); | |
1590 | ||
1591 | schedule_on_each_cpu(test_work); | |
1592 | ||
1593 | kfree(test_malloc); | |
1594 | ||
1595 | set_current_state(TASK_INTERRUPTIBLE); | |
1596 | while (!kthread_should_stop()) | |
1597 | schedule(); | |
1598 | ||
1599 | return 0; | |
1600 | } | |
1601 | ||
1602 | /* | |
1603 | * Do various things that may trigger events. | |
1604 | */ | |
1605 | static __init void event_test_stuff(void) | |
1606 | { | |
1607 | struct task_struct *test_thread; | |
1608 | ||
1609 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
1610 | msleep(1); | |
1611 | kthread_stop(test_thread); | |
1612 | } | |
1613 | ||
1614 | /* | |
1615 | * For every trace event defined, we will test each trace point separately, | |
1616 | * and then by groups, and finally all trace points. | |
1617 | */ | |
9ea21c1e | 1618 | static __init void event_trace_self_tests(void) |
e6187007 SR |
1619 | { |
1620 | struct ftrace_event_call *call; | |
1621 | struct event_subsystem *system; | |
e6187007 SR |
1622 | int ret; |
1623 | ||
1624 | pr_info("Running tests on trace events:\n"); | |
1625 | ||
1626 | list_for_each_entry(call, &ftrace_events, list) { | |
1627 | ||
2239291a SR |
1628 | /* Only test those that have a probe */ |
1629 | if (!call->class || !call->class->probe) | |
e6187007 SR |
1630 | continue; |
1631 | ||
1f5a6b45 SR |
1632 | /* |
1633 | * Testing syscall events here is pretty useless, but | |
1634 | * we still do it if configured. But this is time consuming. | |
1635 | * What we really need is a user thread to perform the | |
1636 | * syscalls as we test. | |
1637 | */ | |
1638 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
1639 | if (call->class->system && |
1640 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
1641 | continue; |
1642 | #endif | |
1643 | ||
e6187007 SR |
1644 | pr_info("Testing event %s: ", call->name); |
1645 | ||
1646 | /* | |
1647 | * If an event is already enabled, someone is using | |
1648 | * it and the self test should not be on. | |
1649 | */ | |
553552ce | 1650 | if (call->flags & TRACE_EVENT_FL_ENABLED) { |
e6187007 SR |
1651 | pr_warning("Enabled event during self test!\n"); |
1652 | WARN_ON_ONCE(1); | |
1653 | continue; | |
1654 | } | |
1655 | ||
0e907c99 | 1656 | ftrace_event_enable_disable(call, 1); |
e6187007 | 1657 | event_test_stuff(); |
0e907c99 | 1658 | ftrace_event_enable_disable(call, 0); |
e6187007 SR |
1659 | |
1660 | pr_cont("OK\n"); | |
1661 | } | |
1662 | ||
1663 | /* Now test at the sub system level */ | |
1664 | ||
1665 | pr_info("Running tests on trace event systems:\n"); | |
1666 | ||
1667 | list_for_each_entry(system, &event_subsystems, list) { | |
1668 | ||
1669 | /* the ftrace system is special, skip it */ | |
1670 | if (strcmp(system->name, "ftrace") == 0) | |
1671 | continue; | |
1672 | ||
1673 | pr_info("Testing event system %s: ", system->name); | |
1674 | ||
8f31bfe5 | 1675 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1); |
e6187007 SR |
1676 | if (WARN_ON_ONCE(ret)) { |
1677 | pr_warning("error enabling system %s\n", | |
1678 | system->name); | |
1679 | continue; | |
1680 | } | |
1681 | ||
1682 | event_test_stuff(); | |
1683 | ||
8f31bfe5 | 1684 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0); |
76bab1b7 | 1685 | if (WARN_ON_ONCE(ret)) { |
e6187007 SR |
1686 | pr_warning("error disabling system %s\n", |
1687 | system->name); | |
76bab1b7 YL |
1688 | continue; |
1689 | } | |
e6187007 SR |
1690 | |
1691 | pr_cont("OK\n"); | |
1692 | } | |
1693 | ||
1694 | /* Test with all events enabled */ | |
1695 | ||
1696 | pr_info("Running tests on all trace events:\n"); | |
1697 | pr_info("Testing all events: "); | |
1698 | ||
8f31bfe5 | 1699 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1); |
e6187007 | 1700 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 1701 | pr_warning("error enabling all events\n"); |
9ea21c1e | 1702 | return; |
e6187007 SR |
1703 | } |
1704 | ||
1705 | event_test_stuff(); | |
1706 | ||
1707 | /* reset sysname */ | |
8f31bfe5 | 1708 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0); |
e6187007 SR |
1709 | if (WARN_ON_ONCE(ret)) { |
1710 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 1711 | return; |
e6187007 SR |
1712 | } |
1713 | ||
1714 | pr_cont("OK\n"); | |
9ea21c1e SR |
1715 | } |
1716 | ||
1717 | #ifdef CONFIG_FUNCTION_TRACER | |
1718 | ||
245b2e70 | 1719 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e SR |
1720 | |
1721 | static void | |
2f5f6ad9 | 1722 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 1723 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
9ea21c1e SR |
1724 | { |
1725 | struct ring_buffer_event *event; | |
e77405ad | 1726 | struct ring_buffer *buffer; |
9ea21c1e SR |
1727 | struct ftrace_entry *entry; |
1728 | unsigned long flags; | |
1729 | long disabled; | |
9ea21c1e SR |
1730 | int cpu; |
1731 | int pc; | |
1732 | ||
1733 | pc = preempt_count(); | |
5168ae50 | 1734 | preempt_disable_notrace(); |
9ea21c1e | 1735 | cpu = raw_smp_processor_id(); |
245b2e70 | 1736 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
1737 | |
1738 | if (disabled != 1) | |
1739 | goto out; | |
1740 | ||
1741 | local_save_flags(flags); | |
1742 | ||
e77405ad SR |
1743 | event = trace_current_buffer_lock_reserve(&buffer, |
1744 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
1745 | flags, pc); |
1746 | if (!event) | |
1747 | goto out; | |
1748 | entry = ring_buffer_event_data(event); | |
1749 | entry->ip = ip; | |
1750 | entry->parent_ip = parent_ip; | |
1751 | ||
e77405ad | 1752 | trace_nowake_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
1753 | |
1754 | out: | |
245b2e70 | 1755 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 1756 | preempt_enable_notrace(); |
9ea21c1e SR |
1757 | } |
1758 | ||
1759 | static struct ftrace_ops trace_ops __initdata = | |
1760 | { | |
1761 | .func = function_test_events_call, | |
4740974a | 1762 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
9ea21c1e SR |
1763 | }; |
1764 | ||
1765 | static __init void event_trace_self_test_with_function(void) | |
1766 | { | |
17bb615a SR |
1767 | int ret; |
1768 | ret = register_ftrace_function(&trace_ops); | |
1769 | if (WARN_ON(ret < 0)) { | |
1770 | pr_info("Failed to enable function tracer for event tests\n"); | |
1771 | return; | |
1772 | } | |
9ea21c1e SR |
1773 | pr_info("Running tests again, along with the function tracer\n"); |
1774 | event_trace_self_tests(); | |
1775 | unregister_ftrace_function(&trace_ops); | |
1776 | } | |
1777 | #else | |
1778 | static __init void event_trace_self_test_with_function(void) | |
1779 | { | |
1780 | } | |
1781 | #endif | |
1782 | ||
1783 | static __init int event_trace_self_tests_init(void) | |
1784 | { | |
020e5f85 LZ |
1785 | if (!tracing_selftest_disabled) { |
1786 | event_trace_self_tests(); | |
1787 | event_trace_self_test_with_function(); | |
1788 | } | |
e6187007 SR |
1789 | |
1790 | return 0; | |
1791 | } | |
1792 | ||
28d20e2d | 1793 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
1794 | |
1795 | #endif |