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 | |
d1a29143 SR |
39 | #define GFP_TRACE (GFP_KERNEL | __GFP_ZERO) |
40 | ||
41 | static struct kmem_cache *field_cachep; | |
42 | static struct kmem_cache *file_cachep; | |
43 | ||
ae63b31e SR |
44 | /* Double loops, do not use break, only goto's work */ |
45 | #define do_for_each_event_file(tr, file) \ | |
46 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
47 | list_for_each_entry(file, &tr->events, list) | |
48 | ||
49 | #define do_for_each_event_file_safe(tr, file) \ | |
50 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
51 | struct ftrace_event_file *___n; \ | |
52 | list_for_each_entry_safe(file, ___n, &tr->events, list) | |
53 | ||
54 | #define while_for_each_event_file() \ | |
55 | } | |
56 | ||
2e33af02 SR |
57 | struct list_head * |
58 | trace_get_fields(struct ftrace_event_call *event_call) | |
59 | { | |
60 | if (!event_call->class->get_fields) | |
61 | return &event_call->class->fields; | |
62 | return event_call->class->get_fields(event_call); | |
63 | } | |
64 | ||
8728fe50 LZ |
65 | static int __trace_define_field(struct list_head *head, const char *type, |
66 | const char *name, int offset, int size, | |
67 | int is_signed, int filter_type) | |
cf027f64 TZ |
68 | { |
69 | struct ftrace_event_field *field; | |
70 | ||
d1a29143 | 71 | field = kmem_cache_alloc(field_cachep, GFP_TRACE); |
cf027f64 TZ |
72 | if (!field) |
73 | goto err; | |
fe9f57f2 | 74 | |
92edca07 SR |
75 | field->name = name; |
76 | field->type = type; | |
fe9f57f2 | 77 | |
43b51ead LZ |
78 | if (filter_type == FILTER_OTHER) |
79 | field->filter_type = filter_assign_type(type); | |
80 | else | |
81 | field->filter_type = filter_type; | |
82 | ||
cf027f64 TZ |
83 | field->offset = offset; |
84 | field->size = size; | |
a118e4d1 | 85 | field->is_signed = is_signed; |
aa38e9fc | 86 | |
2e33af02 | 87 | list_add(&field->link, head); |
cf027f64 TZ |
88 | |
89 | return 0; | |
fe9f57f2 | 90 | |
cf027f64 | 91 | err: |
d1a29143 | 92 | kmem_cache_free(field_cachep, field); |
fe9f57f2 | 93 | |
cf027f64 TZ |
94 | return -ENOMEM; |
95 | } | |
8728fe50 LZ |
96 | |
97 | int trace_define_field(struct ftrace_event_call *call, const char *type, | |
98 | const char *name, int offset, int size, int is_signed, | |
99 | int filter_type) | |
100 | { | |
101 | struct list_head *head; | |
102 | ||
103 | if (WARN_ON(!call->class)) | |
104 | return 0; | |
105 | ||
106 | head = trace_get_fields(call); | |
107 | return __trace_define_field(head, type, name, offset, size, | |
108 | is_signed, filter_type); | |
109 | } | |
17c873ec | 110 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 111 | |
e647d6b3 | 112 | #define __common_field(type, item) \ |
8728fe50 LZ |
113 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
114 | "common_" #item, \ | |
115 | offsetof(typeof(ent), item), \ | |
116 | sizeof(ent.item), \ | |
117 | is_signed_type(type), FILTER_OTHER); \ | |
e647d6b3 LZ |
118 | if (ret) \ |
119 | return ret; | |
120 | ||
8728fe50 | 121 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
122 | { |
123 | int ret; | |
124 | struct trace_entry ent; | |
125 | ||
126 | __common_field(unsigned short, type); | |
127 | __common_field(unsigned char, flags); | |
128 | __common_field(unsigned char, preempt_count); | |
129 | __common_field(int, pid); | |
e647d6b3 LZ |
130 | |
131 | return ret; | |
132 | } | |
133 | ||
bd1a5c84 | 134 | void trace_destroy_fields(struct ftrace_event_call *call) |
2df75e41 LZ |
135 | { |
136 | struct ftrace_event_field *field, *next; | |
2e33af02 | 137 | struct list_head *head; |
2df75e41 | 138 | |
2e33af02 SR |
139 | head = trace_get_fields(call); |
140 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 | 141 | list_del(&field->link); |
d1a29143 | 142 | kmem_cache_free(field_cachep, field); |
2df75e41 LZ |
143 | } |
144 | } | |
145 | ||
87d9b4e1 LZ |
146 | int trace_event_raw_init(struct ftrace_event_call *call) |
147 | { | |
148 | int id; | |
149 | ||
80decc70 | 150 | id = register_ftrace_event(&call->event); |
87d9b4e1 LZ |
151 | if (!id) |
152 | return -ENODEV; | |
87d9b4e1 LZ |
153 | |
154 | return 0; | |
155 | } | |
156 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
157 | ||
ceec0b6f JO |
158 | int ftrace_event_reg(struct ftrace_event_call *call, |
159 | enum trace_reg type, void *data) | |
a1d0ce82 | 160 | { |
ae63b31e SR |
161 | struct ftrace_event_file *file = data; |
162 | ||
a1d0ce82 SR |
163 | switch (type) { |
164 | case TRACE_REG_REGISTER: | |
165 | return tracepoint_probe_register(call->name, | |
166 | call->class->probe, | |
ae63b31e | 167 | file); |
a1d0ce82 SR |
168 | case TRACE_REG_UNREGISTER: |
169 | tracepoint_probe_unregister(call->name, | |
170 | call->class->probe, | |
ae63b31e | 171 | file); |
a1d0ce82 SR |
172 | return 0; |
173 | ||
174 | #ifdef CONFIG_PERF_EVENTS | |
175 | case TRACE_REG_PERF_REGISTER: | |
176 | return tracepoint_probe_register(call->name, | |
177 | call->class->perf_probe, | |
178 | call); | |
179 | case TRACE_REG_PERF_UNREGISTER: | |
180 | tracepoint_probe_unregister(call->name, | |
181 | call->class->perf_probe, | |
182 | call); | |
183 | return 0; | |
ceec0b6f JO |
184 | case TRACE_REG_PERF_OPEN: |
185 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
186 | case TRACE_REG_PERF_ADD: |
187 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 188 | return 0; |
a1d0ce82 SR |
189 | #endif |
190 | } | |
191 | return 0; | |
192 | } | |
193 | EXPORT_SYMBOL_GPL(ftrace_event_reg); | |
194 | ||
e870e9a1 LZ |
195 | void trace_event_enable_cmd_record(bool enable) |
196 | { | |
ae63b31e SR |
197 | struct ftrace_event_file *file; |
198 | struct trace_array *tr; | |
e870e9a1 LZ |
199 | |
200 | mutex_lock(&event_mutex); | |
ae63b31e SR |
201 | do_for_each_event_file(tr, file) { |
202 | ||
203 | if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) | |
e870e9a1 LZ |
204 | continue; |
205 | ||
206 | if (enable) { | |
207 | tracing_start_cmdline_record(); | |
ae63b31e | 208 | file->flags |= FTRACE_EVENT_FL_RECORDED_CMD; |
e870e9a1 LZ |
209 | } else { |
210 | tracing_stop_cmdline_record(); | |
ae63b31e | 211 | file->flags &= ~FTRACE_EVENT_FL_RECORDED_CMD; |
e870e9a1 | 212 | } |
ae63b31e | 213 | } while_for_each_event_file(); |
e870e9a1 LZ |
214 | mutex_unlock(&event_mutex); |
215 | } | |
216 | ||
ae63b31e SR |
217 | static int ftrace_event_enable_disable(struct ftrace_event_file *file, |
218 | int enable) | |
fd994989 | 219 | { |
ae63b31e | 220 | struct ftrace_event_call *call = file->event_call; |
3b8e4273 LZ |
221 | int ret = 0; |
222 | ||
fd994989 SR |
223 | switch (enable) { |
224 | case 0: | |
ae63b31e SR |
225 | if (file->flags & FTRACE_EVENT_FL_ENABLED) { |
226 | file->flags &= ~FTRACE_EVENT_FL_ENABLED; | |
227 | if (file->flags & FTRACE_EVENT_FL_RECORDED_CMD) { | |
e870e9a1 | 228 | tracing_stop_cmdline_record(); |
ae63b31e | 229 | file->flags &= ~FTRACE_EVENT_FL_RECORDED_CMD; |
e870e9a1 | 230 | } |
ae63b31e | 231 | call->class->reg(call, TRACE_REG_UNREGISTER, file); |
fd994989 | 232 | } |
fd994989 SR |
233 | break; |
234 | case 1: | |
ae63b31e | 235 | if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) { |
e870e9a1 LZ |
236 | if (trace_flags & TRACE_ITER_RECORD_CMD) { |
237 | tracing_start_cmdline_record(); | |
ae63b31e | 238 | file->flags |= FTRACE_EVENT_FL_RECORDED_CMD; |
e870e9a1 | 239 | } |
ae63b31e | 240 | ret = call->class->reg(call, TRACE_REG_REGISTER, file); |
3b8e4273 LZ |
241 | if (ret) { |
242 | tracing_stop_cmdline_record(); | |
243 | pr_info("event trace: Could not enable event " | |
244 | "%s\n", call->name); | |
245 | break; | |
246 | } | |
ae63b31e | 247 | file->flags |= FTRACE_EVENT_FL_ENABLED; |
fd994989 | 248 | } |
fd994989 SR |
249 | break; |
250 | } | |
3b8e4273 LZ |
251 | |
252 | return ret; | |
fd994989 SR |
253 | } |
254 | ||
ae63b31e | 255 | static void ftrace_clear_events(struct trace_array *tr) |
0e907c99 | 256 | { |
ae63b31e | 257 | struct ftrace_event_file *file; |
0e907c99 Z |
258 | |
259 | mutex_lock(&event_mutex); | |
ae63b31e SR |
260 | list_for_each_entry(file, &tr->events, list) { |
261 | ftrace_event_enable_disable(file, 0); | |
0e907c99 Z |
262 | } |
263 | mutex_unlock(&event_mutex); | |
264 | } | |
265 | ||
e9dbfae5 SR |
266 | static void __put_system(struct event_subsystem *system) |
267 | { | |
268 | struct event_filter *filter = system->filter; | |
269 | ||
270 | WARN_ON_ONCE(system->ref_count == 0); | |
271 | if (--system->ref_count) | |
272 | return; | |
273 | ||
ae63b31e SR |
274 | list_del(&system->list); |
275 | ||
e9dbfae5 SR |
276 | if (filter) { |
277 | kfree(filter->filter_string); | |
278 | kfree(filter); | |
279 | } | |
e9dbfae5 SR |
280 | kfree(system); |
281 | } | |
282 | ||
283 | static void __get_system(struct event_subsystem *system) | |
284 | { | |
285 | WARN_ON_ONCE(system->ref_count == 0); | |
286 | system->ref_count++; | |
287 | } | |
288 | ||
ae63b31e SR |
289 | static void __get_system_dir(struct ftrace_subsystem_dir *dir) |
290 | { | |
291 | WARN_ON_ONCE(dir->ref_count == 0); | |
292 | dir->ref_count++; | |
293 | __get_system(dir->subsystem); | |
294 | } | |
295 | ||
296 | static void __put_system_dir(struct ftrace_subsystem_dir *dir) | |
297 | { | |
298 | WARN_ON_ONCE(dir->ref_count == 0); | |
299 | /* If the subsystem is about to be freed, the dir must be too */ | |
300 | WARN_ON_ONCE(dir->subsystem->ref_count == 1 && dir->ref_count != 1); | |
301 | ||
302 | __put_system(dir->subsystem); | |
303 | if (!--dir->ref_count) | |
304 | kfree(dir); | |
305 | } | |
306 | ||
307 | static void put_system(struct ftrace_subsystem_dir *dir) | |
e9dbfae5 SR |
308 | { |
309 | mutex_lock(&event_mutex); | |
ae63b31e | 310 | __put_system_dir(dir); |
e9dbfae5 SR |
311 | mutex_unlock(&event_mutex); |
312 | } | |
313 | ||
8f31bfe5 LZ |
314 | /* |
315 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
316 | */ | |
ae63b31e SR |
317 | static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, |
318 | const char *sub, const char *event, int set) | |
b77e38aa | 319 | { |
ae63b31e | 320 | struct ftrace_event_file *file; |
a59fd602 | 321 | struct ftrace_event_call *call; |
29f93943 | 322 | int ret = -EINVAL; |
8f31bfe5 LZ |
323 | |
324 | mutex_lock(&event_mutex); | |
ae63b31e SR |
325 | list_for_each_entry(file, &tr->events, list) { |
326 | ||
327 | call = file->event_call; | |
8f31bfe5 | 328 | |
a1d0ce82 | 329 | if (!call->name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
330 | continue; |
331 | ||
9b63776f SR |
332 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
333 | continue; | |
334 | ||
8f31bfe5 LZ |
335 | if (match && |
336 | strcmp(match, call->name) != 0 && | |
8f082018 | 337 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
338 | continue; |
339 | ||
8f082018 | 340 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
341 | continue; |
342 | ||
343 | if (event && strcmp(event, call->name) != 0) | |
344 | continue; | |
345 | ||
ae63b31e | 346 | ftrace_event_enable_disable(file, set); |
8f31bfe5 LZ |
347 | |
348 | ret = 0; | |
349 | } | |
350 | mutex_unlock(&event_mutex); | |
351 | ||
352 | return ret; | |
353 | } | |
354 | ||
ae63b31e | 355 | static int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set) |
8f31bfe5 | 356 | { |
b628b3e6 | 357 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
358 | |
359 | /* | |
360 | * The buf format can be <subsystem>:<event-name> | |
361 | * *:<event-name> means any event by that name. | |
362 | * :<event-name> is the same. | |
363 | * | |
364 | * <subsystem>:* means all events in that subsystem | |
365 | * <subsystem>: means the same. | |
366 | * | |
367 | * <name> (no ':') means all events in a subsystem with | |
368 | * the name <name> or any event that matches <name> | |
369 | */ | |
370 | ||
371 | match = strsep(&buf, ":"); | |
372 | if (buf) { | |
373 | sub = match; | |
374 | event = buf; | |
375 | match = NULL; | |
376 | ||
377 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
378 | sub = NULL; | |
379 | if (!strlen(event) || strcmp(event, "*") == 0) | |
380 | event = NULL; | |
381 | } | |
b77e38aa | 382 | |
ae63b31e | 383 | return __ftrace_set_clr_event(tr, match, sub, event, set); |
b77e38aa SR |
384 | } |
385 | ||
4671c794 SR |
386 | /** |
387 | * trace_set_clr_event - enable or disable an event | |
388 | * @system: system name to match (NULL for any system) | |
389 | * @event: event name to match (NULL for all events, within system) | |
390 | * @set: 1 to enable, 0 to disable | |
391 | * | |
392 | * This is a way for other parts of the kernel to enable or disable | |
393 | * event recording. | |
394 | * | |
395 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
396 | * registered events. | |
397 | */ | |
398 | int trace_set_clr_event(const char *system, const char *event, int set) | |
399 | { | |
ae63b31e SR |
400 | struct trace_array *tr = top_trace_array(); |
401 | ||
402 | return __ftrace_set_clr_event(tr, NULL, system, event, set); | |
4671c794 | 403 | } |
56355b83 | 404 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 405 | |
b77e38aa SR |
406 | /* 128 should be much more than enough */ |
407 | #define EVENT_BUF_SIZE 127 | |
408 | ||
409 | static ssize_t | |
410 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
411 | size_t cnt, loff_t *ppos) | |
412 | { | |
48966364 | 413 | struct trace_parser parser; |
ae63b31e SR |
414 | struct seq_file *m = file->private_data; |
415 | struct trace_array *tr = m->private; | |
4ba7978e | 416 | ssize_t read, ret; |
b77e38aa | 417 | |
4ba7978e | 418 | if (!cnt) |
b77e38aa SR |
419 | return 0; |
420 | ||
1852fcce SR |
421 | ret = tracing_update_buffers(); |
422 | if (ret < 0) | |
423 | return ret; | |
424 | ||
48966364 | 425 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
426 | return -ENOMEM; |
427 | ||
48966364 | 428 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
429 | ||
4ba7978e | 430 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 431 | int set = 1; |
b77e38aa | 432 | |
48966364 | 433 | if (*parser.buffer == '!') |
b77e38aa | 434 | set = 0; |
b77e38aa | 435 | |
48966364 | 436 | parser.buffer[parser.idx] = 0; |
437 | ||
ae63b31e | 438 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
b77e38aa | 439 | if (ret) |
48966364 | 440 | goto out_put; |
b77e38aa | 441 | } |
b77e38aa SR |
442 | |
443 | ret = read; | |
444 | ||
48966364 | 445 | out_put: |
446 | trace_parser_put(&parser); | |
b77e38aa SR |
447 | |
448 | return ret; | |
449 | } | |
450 | ||
451 | static void * | |
452 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
453 | { | |
ae63b31e SR |
454 | struct ftrace_event_file *file = v; |
455 | struct ftrace_event_call *call; | |
456 | struct trace_array *tr = m->private; | |
b77e38aa SR |
457 | |
458 | (*pos)++; | |
459 | ||
ae63b31e SR |
460 | list_for_each_entry_continue(file, &tr->events, list) { |
461 | call = file->event_call; | |
40e26815 SR |
462 | /* |
463 | * The ftrace subsystem is for showing formats only. | |
464 | * They can not be enabled or disabled via the event files. | |
465 | */ | |
a1d0ce82 | 466 | if (call->class && call->class->reg) |
ae63b31e | 467 | return file; |
40e26815 | 468 | } |
b77e38aa | 469 | |
30bd39cd | 470 | return NULL; |
b77e38aa SR |
471 | } |
472 | ||
473 | static void *t_start(struct seq_file *m, loff_t *pos) | |
474 | { | |
ae63b31e SR |
475 | struct ftrace_event_file *file; |
476 | struct trace_array *tr = m->private; | |
e1c7e2a6 LZ |
477 | loff_t l; |
478 | ||
20c8928a | 479 | mutex_lock(&event_mutex); |
e1c7e2a6 | 480 | |
ae63b31e | 481 | file = list_entry(&tr->events, struct ftrace_event_file, list); |
e1c7e2a6 | 482 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
483 | file = t_next(m, file, &l); |
484 | if (!file) | |
e1c7e2a6 LZ |
485 | break; |
486 | } | |
ae63b31e | 487 | return file; |
b77e38aa SR |
488 | } |
489 | ||
490 | static void * | |
491 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
492 | { | |
ae63b31e SR |
493 | struct ftrace_event_file *file = v; |
494 | struct trace_array *tr = m->private; | |
b77e38aa SR |
495 | |
496 | (*pos)++; | |
497 | ||
ae63b31e SR |
498 | list_for_each_entry_continue(file, &tr->events, list) { |
499 | if (file->flags & FTRACE_EVENT_FL_ENABLED) | |
500 | return file; | |
b77e38aa SR |
501 | } |
502 | ||
30bd39cd | 503 | return NULL; |
b77e38aa SR |
504 | } |
505 | ||
506 | static void *s_start(struct seq_file *m, loff_t *pos) | |
507 | { | |
ae63b31e SR |
508 | struct ftrace_event_file *file; |
509 | struct trace_array *tr = m->private; | |
e1c7e2a6 LZ |
510 | loff_t l; |
511 | ||
20c8928a | 512 | mutex_lock(&event_mutex); |
e1c7e2a6 | 513 | |
ae63b31e | 514 | file = list_entry(&tr->events, struct ftrace_event_file, list); |
e1c7e2a6 | 515 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
516 | file = s_next(m, file, &l); |
517 | if (!file) | |
e1c7e2a6 LZ |
518 | break; |
519 | } | |
ae63b31e | 520 | return file; |
b77e38aa SR |
521 | } |
522 | ||
523 | static int t_show(struct seq_file *m, void *v) | |
524 | { | |
ae63b31e SR |
525 | struct ftrace_event_file *file = v; |
526 | struct ftrace_event_call *call = file->event_call; | |
b77e38aa | 527 | |
8f082018 SR |
528 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
529 | seq_printf(m, "%s:", call->class->system); | |
b77e38aa SR |
530 | seq_printf(m, "%s\n", call->name); |
531 | ||
532 | return 0; | |
533 | } | |
534 | ||
535 | static void t_stop(struct seq_file *m, void *p) | |
536 | { | |
20c8928a | 537 | mutex_unlock(&event_mutex); |
b77e38aa SR |
538 | } |
539 | ||
1473e441 SR |
540 | static ssize_t |
541 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
542 | loff_t *ppos) | |
543 | { | |
ae63b31e | 544 | struct ftrace_event_file *file = filp->private_data; |
1473e441 SR |
545 | char *buf; |
546 | ||
ae63b31e | 547 | if (file->flags & FTRACE_EVENT_FL_ENABLED) |
1473e441 SR |
548 | buf = "1\n"; |
549 | else | |
550 | buf = "0\n"; | |
551 | ||
552 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
553 | } | |
554 | ||
555 | static ssize_t | |
556 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
557 | loff_t *ppos) | |
558 | { | |
ae63b31e | 559 | struct ftrace_event_file *file = filp->private_data; |
1473e441 SR |
560 | unsigned long val; |
561 | int ret; | |
562 | ||
ae63b31e SR |
563 | if (!file) |
564 | return -EINVAL; | |
565 | ||
22fe9b54 PH |
566 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
567 | if (ret) | |
1473e441 SR |
568 | return ret; |
569 | ||
1852fcce SR |
570 | ret = tracing_update_buffers(); |
571 | if (ret < 0) | |
572 | return ret; | |
573 | ||
1473e441 SR |
574 | switch (val) { |
575 | case 0: | |
1473e441 | 576 | case 1: |
11a241a3 | 577 | mutex_lock(&event_mutex); |
ae63b31e | 578 | ret = ftrace_event_enable_disable(file, val); |
11a241a3 | 579 | mutex_unlock(&event_mutex); |
1473e441 SR |
580 | break; |
581 | ||
582 | default: | |
583 | return -EINVAL; | |
584 | } | |
585 | ||
586 | *ppos += cnt; | |
587 | ||
3b8e4273 | 588 | return ret ? ret : cnt; |
1473e441 SR |
589 | } |
590 | ||
8ae79a13 SR |
591 | static ssize_t |
592 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
593 | loff_t *ppos) | |
594 | { | |
c142b15d | 595 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
ae63b31e SR |
596 | struct ftrace_subsystem_dir *dir = filp->private_data; |
597 | struct event_subsystem *system = dir->subsystem; | |
8ae79a13 | 598 | struct ftrace_event_call *call; |
ae63b31e SR |
599 | struct ftrace_event_file *file; |
600 | struct trace_array *tr = dir->tr; | |
8ae79a13 | 601 | char buf[2]; |
c142b15d | 602 | int set = 0; |
8ae79a13 SR |
603 | int ret; |
604 | ||
8ae79a13 | 605 | mutex_lock(&event_mutex); |
ae63b31e SR |
606 | list_for_each_entry(file, &tr->events, list) { |
607 | call = file->event_call; | |
a1d0ce82 | 608 | if (!call->name || !call->class || !call->class->reg) |
8ae79a13 SR |
609 | continue; |
610 | ||
40ee4dff | 611 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
612 | continue; |
613 | ||
614 | /* | |
615 | * We need to find out if all the events are set | |
616 | * or if all events or cleared, or if we have | |
617 | * a mixture. | |
618 | */ | |
ae63b31e | 619 | set |= (1 << !!(file->flags & FTRACE_EVENT_FL_ENABLED)); |
c142b15d | 620 | |
8ae79a13 SR |
621 | /* |
622 | * If we have a mixture, no need to look further. | |
623 | */ | |
c142b15d | 624 | if (set == 3) |
8ae79a13 SR |
625 | break; |
626 | } | |
627 | mutex_unlock(&event_mutex); | |
628 | ||
c142b15d | 629 | buf[0] = set_to_char[set]; |
8ae79a13 | 630 | buf[1] = '\n'; |
8ae79a13 SR |
631 | |
632 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
633 | ||
634 | return ret; | |
635 | } | |
636 | ||
637 | static ssize_t | |
638 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
639 | loff_t *ppos) | |
640 | { | |
ae63b31e SR |
641 | struct ftrace_subsystem_dir *dir = filp->private_data; |
642 | struct event_subsystem *system = dir->subsystem; | |
40ee4dff | 643 | const char *name = NULL; |
8ae79a13 | 644 | unsigned long val; |
8ae79a13 SR |
645 | ssize_t ret; |
646 | ||
22fe9b54 PH |
647 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
648 | if (ret) | |
8ae79a13 SR |
649 | return ret; |
650 | ||
651 | ret = tracing_update_buffers(); | |
652 | if (ret < 0) | |
653 | return ret; | |
654 | ||
8f31bfe5 | 655 | if (val != 0 && val != 1) |
8ae79a13 | 656 | return -EINVAL; |
8ae79a13 | 657 | |
40ee4dff SR |
658 | /* |
659 | * Opening of "enable" adds a ref count to system, | |
660 | * so the name is safe to use. | |
661 | */ | |
662 | if (system) | |
663 | name = system->name; | |
664 | ||
ae63b31e | 665 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
8ae79a13 | 666 | if (ret) |
8f31bfe5 | 667 | goto out; |
8ae79a13 SR |
668 | |
669 | ret = cnt; | |
670 | ||
8f31bfe5 | 671 | out: |
8ae79a13 SR |
672 | *ppos += cnt; |
673 | ||
674 | return ret; | |
675 | } | |
676 | ||
2a37a3df SR |
677 | enum { |
678 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
679 | FORMAT_FIELD_SEPERATOR = 2, |
680 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
681 | }; |
682 | ||
683 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 684 | { |
2a37a3df | 685 | struct ftrace_event_call *call = m->private; |
5a65e956 | 686 | struct ftrace_event_field *field; |
86397dc3 LZ |
687 | struct list_head *common_head = &ftrace_common_fields; |
688 | struct list_head *head = trace_get_fields(call); | |
981d081e | 689 | |
2a37a3df | 690 | (*pos)++; |
5a65e956 | 691 | |
2a37a3df SR |
692 | switch ((unsigned long)v) { |
693 | case FORMAT_HEADER: | |
86397dc3 LZ |
694 | if (unlikely(list_empty(common_head))) |
695 | return NULL; | |
696 | ||
697 | field = list_entry(common_head->prev, | |
698 | struct ftrace_event_field, link); | |
699 | return field; | |
5a65e956 | 700 | |
86397dc3 | 701 | case FORMAT_FIELD_SEPERATOR: |
2a37a3df SR |
702 | if (unlikely(list_empty(head))) |
703 | return NULL; | |
5a65e956 | 704 | |
2a37a3df SR |
705 | field = list_entry(head->prev, struct ftrace_event_field, link); |
706 | return field; | |
5a65e956 | 707 | |
2a37a3df SR |
708 | case FORMAT_PRINTFMT: |
709 | /* all done */ | |
710 | return NULL; | |
5a65e956 LJ |
711 | } |
712 | ||
2a37a3df | 713 | field = v; |
86397dc3 LZ |
714 | if (field->link.prev == common_head) |
715 | return (void *)FORMAT_FIELD_SEPERATOR; | |
716 | else if (field->link.prev == head) | |
2a37a3df SR |
717 | return (void *)FORMAT_PRINTFMT; |
718 | ||
719 | field = list_entry(field->link.prev, struct ftrace_event_field, link); | |
720 | ||
2a37a3df | 721 | return field; |
8728fe50 | 722 | } |
5a65e956 | 723 | |
2a37a3df | 724 | static void *f_start(struct seq_file *m, loff_t *pos) |
8728fe50 | 725 | { |
2a37a3df SR |
726 | loff_t l = 0; |
727 | void *p; | |
5a65e956 | 728 | |
2a37a3df SR |
729 | /* Start by showing the header */ |
730 | if (!*pos) | |
731 | return (void *)FORMAT_HEADER; | |
732 | ||
733 | p = (void *)FORMAT_HEADER; | |
734 | do { | |
735 | p = f_next(m, p, &l); | |
736 | } while (p && l < *pos); | |
737 | ||
738 | return p; | |
739 | } | |
740 | ||
741 | static int f_show(struct seq_file *m, void *v) | |
742 | { | |
743 | struct ftrace_event_call *call = m->private; | |
744 | struct ftrace_event_field *field; | |
745 | const char *array_descriptor; | |
746 | ||
747 | switch ((unsigned long)v) { | |
748 | case FORMAT_HEADER: | |
749 | seq_printf(m, "name: %s\n", call->name); | |
750 | seq_printf(m, "ID: %d\n", call->event.type); | |
751 | seq_printf(m, "format:\n"); | |
8728fe50 | 752 | return 0; |
5a65e956 | 753 | |
86397dc3 LZ |
754 | case FORMAT_FIELD_SEPERATOR: |
755 | seq_putc(m, '\n'); | |
756 | return 0; | |
757 | ||
2a37a3df SR |
758 | case FORMAT_PRINTFMT: |
759 | seq_printf(m, "\nprint fmt: %s\n", | |
760 | call->print_fmt); | |
761 | return 0; | |
981d081e | 762 | } |
8728fe50 | 763 | |
2a37a3df | 764 | field = v; |
8728fe50 | 765 | |
2a37a3df SR |
766 | /* |
767 | * Smartly shows the array type(except dynamic array). | |
768 | * Normal: | |
769 | * field:TYPE VAR | |
770 | * If TYPE := TYPE[LEN], it is shown: | |
771 | * field:TYPE VAR[LEN] | |
772 | */ | |
773 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 774 | |
2a37a3df SR |
775 | if (!strncmp(field->type, "__data_loc", 10)) |
776 | array_descriptor = NULL; | |
8728fe50 | 777 | |
2a37a3df SR |
778 | if (!array_descriptor) |
779 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
780 | field->type, field->name, field->offset, | |
781 | field->size, !!field->is_signed); | |
782 | else | |
783 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
784 | (int)(array_descriptor - field->type), | |
785 | field->type, field->name, | |
786 | array_descriptor, field->offset, | |
787 | field->size, !!field->is_signed); | |
8728fe50 | 788 | |
2a37a3df SR |
789 | return 0; |
790 | } | |
5a65e956 | 791 | |
2a37a3df SR |
792 | static void f_stop(struct seq_file *m, void *p) |
793 | { | |
794 | } | |
981d081e | 795 | |
2a37a3df SR |
796 | static const struct seq_operations trace_format_seq_ops = { |
797 | .start = f_start, | |
798 | .next = f_next, | |
799 | .stop = f_stop, | |
800 | .show = f_show, | |
801 | }; | |
802 | ||
803 | static int trace_format_open(struct inode *inode, struct file *file) | |
804 | { | |
805 | struct ftrace_event_call *call = inode->i_private; | |
806 | struct seq_file *m; | |
807 | int ret; | |
808 | ||
809 | ret = seq_open(file, &trace_format_seq_ops); | |
810 | if (ret < 0) | |
811 | return ret; | |
812 | ||
813 | m = file->private_data; | |
814 | m->private = call; | |
815 | ||
816 | return 0; | |
981d081e SR |
817 | } |
818 | ||
23725aee PZ |
819 | static ssize_t |
820 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
821 | { | |
822 | struct ftrace_event_call *call = filp->private_data; | |
823 | struct trace_seq *s; | |
824 | int r; | |
825 | ||
826 | if (*ppos) | |
827 | return 0; | |
828 | ||
829 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
830 | if (!s) | |
831 | return -ENOMEM; | |
832 | ||
833 | trace_seq_init(s); | |
32c0edae | 834 | trace_seq_printf(s, "%d\n", call->event.type); |
23725aee PZ |
835 | |
836 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
837 | s->buffer, s->len); | |
838 | kfree(s); | |
839 | return r; | |
840 | } | |
841 | ||
7ce7e424 TZ |
842 | static ssize_t |
843 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
844 | loff_t *ppos) | |
845 | { | |
846 | struct ftrace_event_call *call = filp->private_data; | |
847 | struct trace_seq *s; | |
848 | int r; | |
849 | ||
850 | if (*ppos) | |
851 | return 0; | |
852 | ||
853 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
854 | if (!s) | |
855 | return -ENOMEM; | |
856 | ||
857 | trace_seq_init(s); | |
858 | ||
8b372562 | 859 | print_event_filter(call, s); |
4bda2d51 | 860 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
861 | |
862 | kfree(s); | |
863 | ||
864 | return r; | |
865 | } | |
866 | ||
867 | static ssize_t | |
868 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
869 | loff_t *ppos) | |
870 | { | |
871 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 872 | char *buf; |
7ce7e424 TZ |
873 | int err; |
874 | ||
8b372562 | 875 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
876 | return -EINVAL; |
877 | ||
8b372562 TZ |
878 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
879 | if (!buf) | |
7ce7e424 TZ |
880 | return -ENOMEM; |
881 | ||
8b372562 TZ |
882 | if (copy_from_user(buf, ubuf, cnt)) { |
883 | free_page((unsigned long) buf); | |
884 | return -EFAULT; | |
7ce7e424 | 885 | } |
8b372562 | 886 | buf[cnt] = '\0'; |
7ce7e424 | 887 | |
8b372562 TZ |
888 | err = apply_event_filter(call, buf); |
889 | free_page((unsigned long) buf); | |
890 | if (err < 0) | |
44e9c8b7 | 891 | return err; |
0a19e53c | 892 | |
7ce7e424 TZ |
893 | *ppos += cnt; |
894 | ||
895 | return cnt; | |
896 | } | |
897 | ||
e9dbfae5 SR |
898 | static LIST_HEAD(event_subsystems); |
899 | ||
900 | static int subsystem_open(struct inode *inode, struct file *filp) | |
901 | { | |
902 | struct event_subsystem *system = NULL; | |
ae63b31e SR |
903 | struct ftrace_subsystem_dir *dir = NULL; /* Initialize for gcc */ |
904 | struct trace_array *tr; | |
e9dbfae5 SR |
905 | int ret; |
906 | ||
907 | /* Make sure the system still exists */ | |
908 | mutex_lock(&event_mutex); | |
ae63b31e SR |
909 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
910 | list_for_each_entry(dir, &tr->systems, list) { | |
911 | if (dir == inode->i_private) { | |
912 | /* Don't open systems with no events */ | |
913 | if (dir->nr_events) { | |
914 | __get_system_dir(dir); | |
915 | system = dir->subsystem; | |
916 | } | |
917 | goto exit_loop; | |
e9dbfae5 | 918 | } |
e9dbfae5 SR |
919 | } |
920 | } | |
ae63b31e | 921 | exit_loop: |
e9dbfae5 SR |
922 | mutex_unlock(&event_mutex); |
923 | ||
ae63b31e | 924 | if (!system) |
e9dbfae5 SR |
925 | return -ENODEV; |
926 | ||
ae63b31e SR |
927 | /* Some versions of gcc think dir can be uninitialized here */ |
928 | WARN_ON(!dir); | |
929 | ||
e9dbfae5 | 930 | ret = tracing_open_generic(inode, filp); |
ae63b31e SR |
931 | if (ret < 0) |
932 | put_system(dir); | |
933 | ||
934 | return ret; | |
935 | } | |
936 | ||
937 | static int system_tr_open(struct inode *inode, struct file *filp) | |
938 | { | |
939 | struct ftrace_subsystem_dir *dir; | |
940 | struct trace_array *tr = inode->i_private; | |
941 | int ret; | |
942 | ||
943 | /* Make a temporary dir that has no system but points to tr */ | |
944 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); | |
945 | if (!dir) | |
946 | return -ENOMEM; | |
947 | ||
948 | dir->tr = tr; | |
949 | ||
950 | ret = tracing_open_generic(inode, filp); | |
951 | if (ret < 0) | |
952 | kfree(dir); | |
953 | ||
954 | filp->private_data = dir; | |
e9dbfae5 SR |
955 | |
956 | return ret; | |
957 | } | |
958 | ||
959 | static int subsystem_release(struct inode *inode, struct file *file) | |
960 | { | |
ae63b31e | 961 | struct ftrace_subsystem_dir *dir = file->private_data; |
e9dbfae5 | 962 | |
ae63b31e SR |
963 | /* |
964 | * If dir->subsystem is NULL, then this is a temporary | |
965 | * descriptor that was made for a trace_array to enable | |
966 | * all subsystems. | |
967 | */ | |
968 | if (dir->subsystem) | |
969 | put_system(dir); | |
970 | else | |
971 | kfree(dir); | |
e9dbfae5 SR |
972 | |
973 | return 0; | |
974 | } | |
975 | ||
cfb180f3 TZ |
976 | static ssize_t |
977 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
978 | loff_t *ppos) | |
979 | { | |
ae63b31e SR |
980 | struct ftrace_subsystem_dir *dir = filp->private_data; |
981 | struct event_subsystem *system = dir->subsystem; | |
cfb180f3 TZ |
982 | struct trace_seq *s; |
983 | int r; | |
984 | ||
985 | if (*ppos) | |
986 | return 0; | |
987 | ||
988 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
989 | if (!s) | |
990 | return -ENOMEM; | |
991 | ||
992 | trace_seq_init(s); | |
993 | ||
8b372562 | 994 | print_subsystem_event_filter(system, s); |
4bda2d51 | 995 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
996 | |
997 | kfree(s); | |
998 | ||
999 | return r; | |
1000 | } | |
1001 | ||
1002 | static ssize_t | |
1003 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1004 | loff_t *ppos) | |
1005 | { | |
ae63b31e | 1006 | struct ftrace_subsystem_dir *dir = filp->private_data; |
8b372562 | 1007 | char *buf; |
cfb180f3 TZ |
1008 | int err; |
1009 | ||
8b372562 | 1010 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
1011 | return -EINVAL; |
1012 | ||
8b372562 TZ |
1013 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
1014 | if (!buf) | |
cfb180f3 TZ |
1015 | return -ENOMEM; |
1016 | ||
8b372562 TZ |
1017 | if (copy_from_user(buf, ubuf, cnt)) { |
1018 | free_page((unsigned long) buf); | |
1019 | return -EFAULT; | |
cfb180f3 | 1020 | } |
8b372562 | 1021 | buf[cnt] = '\0'; |
cfb180f3 | 1022 | |
ae63b31e | 1023 | err = apply_subsystem_event_filter(dir, buf); |
8b372562 TZ |
1024 | free_page((unsigned long) buf); |
1025 | if (err < 0) | |
44e9c8b7 | 1026 | return err; |
cfb180f3 TZ |
1027 | |
1028 | *ppos += cnt; | |
1029 | ||
1030 | return cnt; | |
1031 | } | |
1032 | ||
d1b182a8 SR |
1033 | static ssize_t |
1034 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1035 | { | |
1036 | int (*func)(struct trace_seq *s) = filp->private_data; | |
1037 | struct trace_seq *s; | |
1038 | int r; | |
1039 | ||
1040 | if (*ppos) | |
1041 | return 0; | |
1042 | ||
1043 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1044 | if (!s) | |
1045 | return -ENOMEM; | |
1046 | ||
1047 | trace_seq_init(s); | |
1048 | ||
1049 | func(s); | |
1050 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
1051 | ||
1052 | kfree(s); | |
1053 | ||
1054 | return r; | |
1055 | } | |
1056 | ||
15075cac SR |
1057 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
1058 | static int ftrace_event_set_open(struct inode *inode, struct file *file); | |
1059 | ||
b77e38aa SR |
1060 | static const struct seq_operations show_event_seq_ops = { |
1061 | .start = t_start, | |
1062 | .next = t_next, | |
1063 | .show = t_show, | |
1064 | .stop = t_stop, | |
1065 | }; | |
1066 | ||
1067 | static const struct seq_operations show_set_event_seq_ops = { | |
1068 | .start = s_start, | |
1069 | .next = s_next, | |
1070 | .show = t_show, | |
1071 | .stop = t_stop, | |
1072 | }; | |
1073 | ||
2314c4ae | 1074 | static const struct file_operations ftrace_avail_fops = { |
15075cac | 1075 | .open = ftrace_event_avail_open, |
2314c4ae SR |
1076 | .read = seq_read, |
1077 | .llseek = seq_lseek, | |
1078 | .release = seq_release, | |
1079 | }; | |
1080 | ||
b77e38aa | 1081 | static const struct file_operations ftrace_set_event_fops = { |
15075cac | 1082 | .open = ftrace_event_set_open, |
b77e38aa SR |
1083 | .read = seq_read, |
1084 | .write = ftrace_event_write, | |
1085 | .llseek = seq_lseek, | |
1086 | .release = seq_release, | |
1087 | }; | |
1088 | ||
1473e441 SR |
1089 | static const struct file_operations ftrace_enable_fops = { |
1090 | .open = tracing_open_generic, | |
1091 | .read = event_enable_read, | |
1092 | .write = event_enable_write, | |
6038f373 | 1093 | .llseek = default_llseek, |
1473e441 SR |
1094 | }; |
1095 | ||
981d081e | 1096 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
1097 | .open = trace_format_open, |
1098 | .read = seq_read, | |
1099 | .llseek = seq_lseek, | |
1100 | .release = seq_release, | |
981d081e SR |
1101 | }; |
1102 | ||
23725aee PZ |
1103 | static const struct file_operations ftrace_event_id_fops = { |
1104 | .open = tracing_open_generic, | |
1105 | .read = event_id_read, | |
6038f373 | 1106 | .llseek = default_llseek, |
23725aee PZ |
1107 | }; |
1108 | ||
7ce7e424 TZ |
1109 | static const struct file_operations ftrace_event_filter_fops = { |
1110 | .open = tracing_open_generic, | |
1111 | .read = event_filter_read, | |
1112 | .write = event_filter_write, | |
6038f373 | 1113 | .llseek = default_llseek, |
7ce7e424 TZ |
1114 | }; |
1115 | ||
cfb180f3 | 1116 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 1117 | .open = subsystem_open, |
cfb180f3 TZ |
1118 | .read = subsystem_filter_read, |
1119 | .write = subsystem_filter_write, | |
6038f373 | 1120 | .llseek = default_llseek, |
e9dbfae5 | 1121 | .release = subsystem_release, |
cfb180f3 TZ |
1122 | }; |
1123 | ||
8ae79a13 | 1124 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 1125 | .open = subsystem_open, |
8ae79a13 SR |
1126 | .read = system_enable_read, |
1127 | .write = system_enable_write, | |
6038f373 | 1128 | .llseek = default_llseek, |
40ee4dff | 1129 | .release = subsystem_release, |
8ae79a13 SR |
1130 | }; |
1131 | ||
ae63b31e SR |
1132 | static const struct file_operations ftrace_tr_enable_fops = { |
1133 | .open = system_tr_open, | |
1134 | .read = system_enable_read, | |
1135 | .write = system_enable_write, | |
1136 | .llseek = default_llseek, | |
1137 | .release = subsystem_release, | |
1138 | }; | |
1139 | ||
d1b182a8 SR |
1140 | static const struct file_operations ftrace_show_header_fops = { |
1141 | .open = tracing_open_generic, | |
1142 | .read = show_header, | |
6038f373 | 1143 | .llseek = default_llseek, |
d1b182a8 SR |
1144 | }; |
1145 | ||
ae63b31e SR |
1146 | static int |
1147 | ftrace_event_open(struct inode *inode, struct file *file, | |
1148 | const struct seq_operations *seq_ops) | |
1473e441 | 1149 | { |
ae63b31e SR |
1150 | struct seq_file *m; |
1151 | int ret; | |
1473e441 | 1152 | |
ae63b31e SR |
1153 | ret = seq_open(file, seq_ops); |
1154 | if (ret < 0) | |
1155 | return ret; | |
1156 | m = file->private_data; | |
1157 | /* copy tr over to seq ops */ | |
1158 | m->private = inode->i_private; | |
1473e441 | 1159 | |
ae63b31e | 1160 | return ret; |
1473e441 SR |
1161 | } |
1162 | ||
15075cac SR |
1163 | static int |
1164 | ftrace_event_avail_open(struct inode *inode, struct file *file) | |
1165 | { | |
1166 | const struct seq_operations *seq_ops = &show_event_seq_ops; | |
1167 | ||
ae63b31e | 1168 | return ftrace_event_open(inode, file, seq_ops); |
15075cac SR |
1169 | } |
1170 | ||
1171 | static int | |
1172 | ftrace_event_set_open(struct inode *inode, struct file *file) | |
1173 | { | |
1174 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; | |
ae63b31e | 1175 | struct trace_array *tr = inode->i_private; |
15075cac SR |
1176 | |
1177 | if ((file->f_mode & FMODE_WRITE) && | |
1178 | (file->f_flags & O_TRUNC)) | |
ae63b31e | 1179 | ftrace_clear_events(tr); |
15075cac | 1180 | |
ae63b31e SR |
1181 | return ftrace_event_open(inode, file, seq_ops); |
1182 | } | |
1183 | ||
1184 | static struct event_subsystem * | |
1185 | create_new_subsystem(const char *name) | |
1186 | { | |
1187 | struct event_subsystem *system; | |
1188 | ||
1189 | /* need to create new entry */ | |
1190 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1191 | if (!system) | |
1192 | return NULL; | |
1193 | ||
1194 | system->ref_count = 1; | |
92edca07 | 1195 | system->name = name; |
ae63b31e SR |
1196 | |
1197 | system->filter = NULL; | |
1198 | ||
1199 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); | |
1200 | if (!system->filter) | |
1201 | goto out_free; | |
1202 | ||
1203 | list_add(&system->list, &event_subsystems); | |
1204 | ||
1205 | return system; | |
1206 | ||
1207 | out_free: | |
ae63b31e SR |
1208 | kfree(system); |
1209 | return NULL; | |
15075cac SR |
1210 | } |
1211 | ||
6ecc2d1c | 1212 | static struct dentry * |
ae63b31e SR |
1213 | event_subsystem_dir(struct trace_array *tr, const char *name, |
1214 | struct ftrace_event_file *file, struct dentry *parent) | |
6ecc2d1c | 1215 | { |
ae63b31e | 1216 | struct ftrace_subsystem_dir *dir; |
6ecc2d1c | 1217 | struct event_subsystem *system; |
e1112b4d | 1218 | struct dentry *entry; |
6ecc2d1c SR |
1219 | |
1220 | /* First see if we did not already create this dir */ | |
ae63b31e SR |
1221 | list_for_each_entry(dir, &tr->systems, list) { |
1222 | system = dir->subsystem; | |
dc82ec98 | 1223 | if (strcmp(system->name, name) == 0) { |
ae63b31e SR |
1224 | dir->nr_events++; |
1225 | file->system = dir; | |
1226 | return dir->entry; | |
dc82ec98 | 1227 | } |
6ecc2d1c SR |
1228 | } |
1229 | ||
ae63b31e SR |
1230 | /* Now see if the system itself exists. */ |
1231 | list_for_each_entry(system, &event_subsystems, list) { | |
1232 | if (strcmp(system->name, name) == 0) | |
1233 | break; | |
6ecc2d1c | 1234 | } |
ae63b31e SR |
1235 | /* Reset system variable when not found */ |
1236 | if (&system->list == &event_subsystems) | |
1237 | system = NULL; | |
6ecc2d1c | 1238 | |
ae63b31e SR |
1239 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
1240 | if (!dir) | |
1241 | goto out_fail; | |
6ecc2d1c | 1242 | |
ae63b31e SR |
1243 | if (!system) { |
1244 | system = create_new_subsystem(name); | |
1245 | if (!system) | |
1246 | goto out_free; | |
1247 | } else | |
1248 | __get_system(system); | |
1249 | ||
1250 | dir->entry = debugfs_create_dir(name, parent); | |
1251 | if (!dir->entry) { | |
1252 | pr_warning("Failed to create system directory %s\n", name); | |
1253 | __put_system(system); | |
1254 | goto out_free; | |
6d723736 SR |
1255 | } |
1256 | ||
ae63b31e SR |
1257 | dir->tr = tr; |
1258 | dir->ref_count = 1; | |
1259 | dir->nr_events = 1; | |
1260 | dir->subsystem = system; | |
1261 | file->system = dir; | |
8b372562 | 1262 | |
ae63b31e | 1263 | entry = debugfs_create_file("filter", 0644, dir->entry, dir, |
e1112b4d | 1264 | &ftrace_subsystem_filter_fops); |
8b372562 TZ |
1265 | if (!entry) { |
1266 | kfree(system->filter); | |
1267 | system->filter = NULL; | |
ae63b31e | 1268 | pr_warning("Could not create debugfs '%s/filter' entry\n", name); |
8b372562 | 1269 | } |
e1112b4d | 1270 | |
ae63b31e | 1271 | trace_create_file("enable", 0644, dir->entry, dir, |
f3f3f009 | 1272 | &ftrace_system_enable_fops); |
8ae79a13 | 1273 | |
ae63b31e SR |
1274 | list_add(&dir->list, &tr->systems); |
1275 | ||
1276 | return dir->entry; | |
1277 | ||
1278 | out_free: | |
1279 | kfree(dir); | |
1280 | out_fail: | |
1281 | /* Only print this message if failed on memory allocation */ | |
1282 | if (!dir || !system) | |
1283 | pr_warning("No memory to create event subsystem %s\n", | |
1284 | name); | |
1285 | return NULL; | |
6ecc2d1c SR |
1286 | } |
1287 | ||
1473e441 | 1288 | static int |
ae63b31e SR |
1289 | event_create_dir(struct dentry *parent, |
1290 | struct ftrace_event_file *file, | |
701970b3 SR |
1291 | const struct file_operations *id, |
1292 | const struct file_operations *enable, | |
1293 | const struct file_operations *filter, | |
1294 | const struct file_operations *format) | |
1473e441 | 1295 | { |
ae63b31e SR |
1296 | struct ftrace_event_call *call = file->event_call; |
1297 | struct trace_array *tr = file->tr; | |
2e33af02 | 1298 | struct list_head *head; |
ae63b31e | 1299 | struct dentry *d_events; |
fd994989 | 1300 | int ret; |
1473e441 | 1301 | |
6ecc2d1c SR |
1302 | /* |
1303 | * If the trace point header did not define TRACE_SYSTEM | |
1304 | * then the system would be called "TRACE_SYSTEM". | |
1305 | */ | |
ae63b31e SR |
1306 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { |
1307 | d_events = event_subsystem_dir(tr, call->class->system, file, parent); | |
1308 | if (!d_events) | |
1309 | return -ENOMEM; | |
1310 | } else | |
1311 | d_events = parent; | |
1312 | ||
1313 | file->dir = debugfs_create_dir(call->name, d_events); | |
1314 | if (!file->dir) { | |
1315 | pr_warning("Could not create debugfs '%s' directory\n", | |
1316 | call->name); | |
1473e441 SR |
1317 | return -1; |
1318 | } | |
1319 | ||
9b63776f | 1320 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
ae63b31e | 1321 | trace_create_file("enable", 0644, file->dir, file, |
f3f3f009 | 1322 | enable); |
1473e441 | 1323 | |
2239291a | 1324 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 1325 | if (call->event.type && call->class->reg) |
ae63b31e | 1326 | trace_create_file("id", 0444, file->dir, call, |
f3f3f009 | 1327 | id); |
2239291a | 1328 | #endif |
23725aee | 1329 | |
c9d932cf LZ |
1330 | /* |
1331 | * Other events may have the same class. Only update | |
1332 | * the fields if they are not already defined. | |
1333 | */ | |
1334 | head = trace_get_fields(call); | |
1335 | if (list_empty(head)) { | |
1336 | ret = call->class->define_fields(call); | |
1337 | if (ret < 0) { | |
1338 | pr_warning("Could not initialize trace point" | |
1339 | " events/%s\n", call->name); | |
ae63b31e | 1340 | return -1; |
cf027f64 TZ |
1341 | } |
1342 | } | |
ae63b31e | 1343 | trace_create_file("filter", 0644, file->dir, call, |
c9d932cf | 1344 | filter); |
cf027f64 | 1345 | |
ae63b31e | 1346 | trace_create_file("format", 0444, file->dir, call, |
f3f3f009 | 1347 | format); |
6d723736 SR |
1348 | |
1349 | return 0; | |
1350 | } | |
1351 | ||
ae63b31e SR |
1352 | static void remove_subsystem(struct ftrace_subsystem_dir *dir) |
1353 | { | |
1354 | if (!dir) | |
1355 | return; | |
1356 | ||
1357 | if (!--dir->nr_events) { | |
1358 | debugfs_remove_recursive(dir->entry); | |
1359 | list_del(&dir->list); | |
1360 | __put_system_dir(dir); | |
1361 | } | |
1362 | } | |
1363 | ||
1364 | static void remove_event_from_tracers(struct ftrace_event_call *call) | |
1365 | { | |
1366 | struct ftrace_event_file *file; | |
1367 | struct trace_array *tr; | |
1368 | ||
1369 | do_for_each_event_file_safe(tr, file) { | |
1370 | ||
1371 | if (file->event_call != call) | |
1372 | continue; | |
1373 | ||
1374 | list_del(&file->list); | |
1375 | debugfs_remove_recursive(file->dir); | |
1376 | remove_subsystem(file->system); | |
d1a29143 | 1377 | kmem_cache_free(file_cachep, file); |
ae63b31e SR |
1378 | |
1379 | /* | |
1380 | * The do_for_each_event_file_safe() is | |
1381 | * a double loop. After finding the call for this | |
1382 | * trace_array, we use break to jump to the next | |
1383 | * trace_array. | |
1384 | */ | |
1385 | break; | |
1386 | } while_for_each_event_file(); | |
1387 | } | |
1388 | ||
8781915a EG |
1389 | static void event_remove(struct ftrace_event_call *call) |
1390 | { | |
ae63b31e SR |
1391 | struct trace_array *tr; |
1392 | struct ftrace_event_file *file; | |
1393 | ||
1394 | do_for_each_event_file(tr, file) { | |
1395 | if (file->event_call != call) | |
1396 | continue; | |
1397 | ftrace_event_enable_disable(file, 0); | |
1398 | /* | |
1399 | * The do_for_each_event_file() is | |
1400 | * a double loop. After finding the call for this | |
1401 | * trace_array, we use break to jump to the next | |
1402 | * trace_array. | |
1403 | */ | |
1404 | break; | |
1405 | } while_for_each_event_file(); | |
1406 | ||
8781915a EG |
1407 | if (call->event.funcs) |
1408 | __unregister_ftrace_event(&call->event); | |
ae63b31e | 1409 | remove_event_from_tracers(call); |
8781915a EG |
1410 | list_del(&call->list); |
1411 | } | |
1412 | ||
1413 | static int event_init(struct ftrace_event_call *call) | |
1414 | { | |
1415 | int ret = 0; | |
1416 | ||
1417 | if (WARN_ON(!call->name)) | |
1418 | return -EINVAL; | |
1419 | ||
1420 | if (call->class->raw_init) { | |
1421 | ret = call->class->raw_init(call); | |
1422 | if (ret < 0 && ret != -ENOSYS) | |
1423 | pr_warn("Could not initialize trace events/%s\n", | |
1424 | call->name); | |
1425 | } | |
1426 | ||
1427 | return ret; | |
1428 | } | |
1429 | ||
67ead0a6 | 1430 | static int |
ae63b31e | 1431 | __register_event(struct ftrace_event_call *call, struct module *mod) |
bd1a5c84 | 1432 | { |
bd1a5c84 | 1433 | int ret; |
6d723736 | 1434 | |
8781915a EG |
1435 | ret = event_init(call); |
1436 | if (ret < 0) | |
1437 | return ret; | |
701970b3 | 1438 | |
ae63b31e | 1439 | list_add(&call->list, &ftrace_events); |
67ead0a6 | 1440 | call->mod = mod; |
88f70d75 | 1441 | |
ae63b31e | 1442 | return 0; |
bd1a5c84 MH |
1443 | } |
1444 | ||
ae63b31e SR |
1445 | /* Add an event to a trace directory */ |
1446 | static int | |
1447 | __trace_add_new_event(struct ftrace_event_call *call, | |
1448 | struct trace_array *tr, | |
1449 | const struct file_operations *id, | |
1450 | const struct file_operations *enable, | |
1451 | const struct file_operations *filter, | |
1452 | const struct file_operations *format) | |
1453 | { | |
1454 | struct ftrace_event_file *file; | |
1455 | ||
d1a29143 | 1456 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); |
ae63b31e SR |
1457 | if (!file) |
1458 | return -ENOMEM; | |
1459 | ||
1460 | file->event_call = call; | |
1461 | file->tr = tr; | |
1462 | list_add(&file->list, &tr->events); | |
1463 | ||
1464 | return event_create_dir(tr->event_dir, file, id, enable, filter, format); | |
1465 | } | |
1466 | ||
77248221 SR |
1467 | /* |
1468 | * Just create a decriptor for early init. A descriptor is required | |
1469 | * for enabling events at boot. We want to enable events before | |
1470 | * the filesystem is initialized. | |
1471 | */ | |
1472 | static __init int | |
1473 | __trace_early_add_new_event(struct ftrace_event_call *call, | |
1474 | struct trace_array *tr) | |
1475 | { | |
1476 | struct ftrace_event_file *file; | |
1477 | ||
d1a29143 | 1478 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); |
77248221 SR |
1479 | if (!file) |
1480 | return -ENOMEM; | |
1481 | ||
1482 | file->event_call = call; | |
1483 | file->tr = tr; | |
1484 | list_add(&file->list, &tr->events); | |
1485 | ||
1486 | return 0; | |
1487 | } | |
1488 | ||
ae63b31e SR |
1489 | struct ftrace_module_file_ops; |
1490 | static void __add_event_to_tracers(struct ftrace_event_call *call, | |
1491 | struct ftrace_module_file_ops *file_ops); | |
1492 | ||
bd1a5c84 MH |
1493 | /* Add an additional event_call dynamically */ |
1494 | int trace_add_event_call(struct ftrace_event_call *call) | |
1495 | { | |
1496 | int ret; | |
1497 | mutex_lock(&event_mutex); | |
701970b3 | 1498 | |
ae63b31e SR |
1499 | ret = __register_event(call, NULL); |
1500 | if (ret >= 0) | |
1501 | __add_event_to_tracers(call, NULL); | |
a2ca5e03 | 1502 | |
ae63b31e SR |
1503 | mutex_unlock(&event_mutex); |
1504 | return ret; | |
a2ca5e03 FW |
1505 | } |
1506 | ||
4fead8e4 MH |
1507 | /* |
1508 | * Must be called under locking both of event_mutex and trace_event_mutex. | |
1509 | */ | |
bd1a5c84 MH |
1510 | static void __trace_remove_event_call(struct ftrace_event_call *call) |
1511 | { | |
8781915a | 1512 | event_remove(call); |
bd1a5c84 MH |
1513 | trace_destroy_fields(call); |
1514 | destroy_preds(call); | |
bd1a5c84 MH |
1515 | } |
1516 | ||
1517 | /* Remove an event_call */ | |
1518 | void trace_remove_event_call(struct ftrace_event_call *call) | |
1519 | { | |
1520 | mutex_lock(&event_mutex); | |
4fead8e4 | 1521 | down_write(&trace_event_mutex); |
bd1a5c84 | 1522 | __trace_remove_event_call(call); |
4fead8e4 | 1523 | up_write(&trace_event_mutex); |
bd1a5c84 MH |
1524 | mutex_unlock(&event_mutex); |
1525 | } | |
1526 | ||
1527 | #define for_each_event(event, start, end) \ | |
1528 | for (event = start; \ | |
1529 | (unsigned long)event < (unsigned long)end; \ | |
1530 | event++) | |
1531 | ||
1532 | #ifdef CONFIG_MODULES | |
1533 | ||
1534 | static LIST_HEAD(ftrace_module_file_list); | |
1535 | ||
1536 | /* | |
1537 | * Modules must own their file_operations to keep up with | |
1538 | * reference counting. | |
1539 | */ | |
1540 | struct ftrace_module_file_ops { | |
1541 | struct list_head list; | |
1542 | struct module *mod; | |
1543 | struct file_operations id; | |
1544 | struct file_operations enable; | |
1545 | struct file_operations format; | |
1546 | struct file_operations filter; | |
1547 | }; | |
1548 | ||
ae63b31e SR |
1549 | static struct ftrace_module_file_ops *find_ftrace_file_ops(struct module *mod) |
1550 | { | |
1551 | struct ftrace_module_file_ops *file_ops; | |
1552 | ||
1553 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1554 | if (file_ops->mod == mod) | |
1555 | return file_ops; | |
1556 | } | |
1557 | return NULL; | |
1558 | } | |
1559 | ||
701970b3 SR |
1560 | static struct ftrace_module_file_ops * |
1561 | trace_create_file_ops(struct module *mod) | |
1562 | { | |
1563 | struct ftrace_module_file_ops *file_ops; | |
1564 | ||
1565 | /* | |
1566 | * This is a bit of a PITA. To allow for correct reference | |
1567 | * counting, modules must "own" their file_operations. | |
1568 | * To do this, we allocate the file operations that will be | |
1569 | * used in the event directory. | |
1570 | */ | |
1571 | ||
1572 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1573 | if (!file_ops) | |
1574 | return NULL; | |
1575 | ||
1576 | file_ops->mod = mod; | |
1577 | ||
1578 | file_ops->id = ftrace_event_id_fops; | |
1579 | file_ops->id.owner = mod; | |
1580 | ||
1581 | file_ops->enable = ftrace_enable_fops; | |
1582 | file_ops->enable.owner = mod; | |
1583 | ||
1584 | file_ops->filter = ftrace_event_filter_fops; | |
1585 | file_ops->filter.owner = mod; | |
1586 | ||
1587 | file_ops->format = ftrace_event_format_fops; | |
1588 | file_ops->format.owner = mod; | |
1589 | ||
1590 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1591 | ||
1592 | return file_ops; | |
1593 | } | |
1594 | ||
6d723736 SR |
1595 | static void trace_module_add_events(struct module *mod) |
1596 | { | |
701970b3 | 1597 | struct ftrace_module_file_ops *file_ops = NULL; |
e4a9ea5e | 1598 | struct ftrace_event_call **call, **start, **end; |
6d723736 SR |
1599 | |
1600 | start = mod->trace_events; | |
1601 | end = mod->trace_events + mod->num_trace_events; | |
1602 | ||
1603 | if (start == end) | |
1604 | return; | |
1605 | ||
67ead0a6 LZ |
1606 | file_ops = trace_create_file_ops(mod); |
1607 | if (!file_ops) | |
6d723736 SR |
1608 | return; |
1609 | ||
1610 | for_each_event(call, start, end) { | |
ae63b31e SR |
1611 | __register_event(*call, mod); |
1612 | __add_event_to_tracers(*call, file_ops); | |
6d723736 SR |
1613 | } |
1614 | } | |
1615 | ||
1616 | static void trace_module_remove_events(struct module *mod) | |
1617 | { | |
701970b3 | 1618 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1619 | struct ftrace_event_call *call, *p; |
9456f0fa | 1620 | bool found = false; |
6d723736 | 1621 | |
110bf2b7 | 1622 | down_write(&trace_event_mutex); |
6d723736 SR |
1623 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1624 | if (call->mod == mod) { | |
9456f0fa | 1625 | found = true; |
bd1a5c84 | 1626 | __trace_remove_event_call(call); |
6d723736 SR |
1627 | } |
1628 | } | |
701970b3 SR |
1629 | |
1630 | /* Now free the file_operations */ | |
1631 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1632 | if (file_ops->mod == mod) | |
1633 | break; | |
1634 | } | |
1635 | if (&file_ops->list != &ftrace_module_file_list) { | |
1636 | list_del(&file_ops->list); | |
1637 | kfree(file_ops); | |
1638 | } | |
9456f0fa SR |
1639 | |
1640 | /* | |
1641 | * It is safest to reset the ring buffer if the module being unloaded | |
1642 | * registered any events. | |
1643 | */ | |
1644 | if (found) | |
1645 | tracing_reset_current_online_cpus(); | |
110bf2b7 | 1646 | up_write(&trace_event_mutex); |
6d723736 SR |
1647 | } |
1648 | ||
61f919a1 SR |
1649 | static int trace_module_notify(struct notifier_block *self, |
1650 | unsigned long val, void *data) | |
6d723736 SR |
1651 | { |
1652 | struct module *mod = data; | |
1653 | ||
1654 | mutex_lock(&event_mutex); | |
1655 | switch (val) { | |
1656 | case MODULE_STATE_COMING: | |
1657 | trace_module_add_events(mod); | |
1658 | break; | |
1659 | case MODULE_STATE_GOING: | |
1660 | trace_module_remove_events(mod); | |
1661 | break; | |
1662 | } | |
1663 | mutex_unlock(&event_mutex); | |
fd994989 | 1664 | |
1473e441 SR |
1665 | return 0; |
1666 | } | |
61f919a1 | 1667 | #else |
ae63b31e SR |
1668 | static struct ftrace_module_file_ops *find_ftrace_file_ops(struct module *mod) |
1669 | { | |
1670 | return NULL; | |
1671 | } | |
61f919a1 SR |
1672 | static int trace_module_notify(struct notifier_block *self, |
1673 | unsigned long val, void *data) | |
1674 | { | |
1675 | return 0; | |
1676 | } | |
1677 | #endif /* CONFIG_MODULES */ | |
1473e441 | 1678 | |
ae63b31e SR |
1679 | /* Create a new event directory structure for a trace directory. */ |
1680 | static void | |
1681 | __trace_add_event_dirs(struct trace_array *tr) | |
1682 | { | |
1683 | struct ftrace_module_file_ops *file_ops = NULL; | |
1684 | struct ftrace_event_call *call; | |
1685 | int ret; | |
1686 | ||
1687 | list_for_each_entry(call, &ftrace_events, list) { | |
1688 | if (call->mod) { | |
1689 | /* | |
1690 | * Directories for events by modules need to | |
1691 | * keep module ref counts when opened (as we don't | |
1692 | * want the module to disappear when reading one | |
1693 | * of these files). The file_ops keep account of | |
1694 | * the module ref count. | |
1695 | * | |
1696 | * As event_calls are added in groups by module, | |
1697 | * when we find one file_ops, we don't need to search for | |
1698 | * each call in that module, as the rest should be the | |
1699 | * same. Only search for a new one if the last one did | |
1700 | * not match. | |
1701 | */ | |
1702 | if (!file_ops || call->mod != file_ops->mod) | |
1703 | file_ops = find_ftrace_file_ops(call->mod); | |
1704 | if (!file_ops) | |
1705 | continue; /* Warn? */ | |
1706 | ret = __trace_add_new_event(call, tr, | |
1707 | &file_ops->id, &file_ops->enable, | |
1708 | &file_ops->filter, &file_ops->format); | |
1709 | if (ret < 0) | |
1710 | pr_warning("Could not create directory for event %s\n", | |
1711 | call->name); | |
1712 | continue; | |
1713 | } | |
1714 | ret = __trace_add_new_event(call, tr, | |
1715 | &ftrace_event_id_fops, | |
1716 | &ftrace_enable_fops, | |
1717 | &ftrace_event_filter_fops, | |
1718 | &ftrace_event_format_fops); | |
1719 | if (ret < 0) | |
1720 | pr_warning("Could not create directory for event %s\n", | |
1721 | call->name); | |
1722 | } | |
1723 | } | |
1724 | ||
77248221 SR |
1725 | /* |
1726 | * The top level array has already had its ftrace_event_file | |
1727 | * descriptors created in order to allow for early events to | |
1728 | * be recorded. This function is called after the debugfs has been | |
1729 | * initialized, and we now have to create the files associated | |
1730 | * to the events. | |
1731 | */ | |
1732 | static __init void | |
1733 | __trace_early_add_event_dirs(struct trace_array *tr) | |
1734 | { | |
1735 | struct ftrace_event_file *file; | |
1736 | int ret; | |
1737 | ||
1738 | ||
1739 | list_for_each_entry(file, &tr->events, list) { | |
1740 | ret = event_create_dir(tr->event_dir, file, | |
1741 | &ftrace_event_id_fops, | |
1742 | &ftrace_enable_fops, | |
1743 | &ftrace_event_filter_fops, | |
1744 | &ftrace_event_format_fops); | |
1745 | if (ret < 0) | |
1746 | pr_warning("Could not create directory for event %s\n", | |
1747 | file->event_call->name); | |
1748 | } | |
1749 | } | |
1750 | ||
1751 | /* | |
1752 | * For early boot up, the top trace array requires to have | |
1753 | * a list of events that can be enabled. This must be done before | |
1754 | * the filesystem is set up in order to allow events to be traced | |
1755 | * early. | |
1756 | */ | |
1757 | static __init void | |
1758 | __trace_early_add_events(struct trace_array *tr) | |
1759 | { | |
1760 | struct ftrace_event_call *call; | |
1761 | int ret; | |
1762 | ||
1763 | list_for_each_entry(call, &ftrace_events, list) { | |
1764 | /* Early boot up should not have any modules loaded */ | |
1765 | if (WARN_ON_ONCE(call->mod)) | |
1766 | continue; | |
1767 | ||
1768 | ret = __trace_early_add_new_event(call, tr); | |
1769 | if (ret < 0) | |
1770 | pr_warning("Could not create early event %s\n", | |
1771 | call->name); | |
1772 | } | |
1773 | } | |
1774 | ||
0c8916c3 SR |
1775 | /* Remove the event directory structure for a trace directory. */ |
1776 | static void | |
1777 | __trace_remove_event_dirs(struct trace_array *tr) | |
1778 | { | |
1779 | struct ftrace_event_file *file, *next; | |
1780 | ||
1781 | list_for_each_entry_safe(file, next, &tr->events, list) { | |
1782 | list_del(&file->list); | |
1783 | debugfs_remove_recursive(file->dir); | |
1784 | remove_subsystem(file->system); | |
d1a29143 | 1785 | kmem_cache_free(file_cachep, file); |
0c8916c3 SR |
1786 | } |
1787 | } | |
1788 | ||
ae63b31e SR |
1789 | static void |
1790 | __add_event_to_tracers(struct ftrace_event_call *call, | |
1791 | struct ftrace_module_file_ops *file_ops) | |
1792 | { | |
1793 | struct trace_array *tr; | |
1794 | ||
1795 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
1796 | if (file_ops) | |
1797 | __trace_add_new_event(call, tr, | |
1798 | &file_ops->id, &file_ops->enable, | |
1799 | &file_ops->filter, &file_ops->format); | |
1800 | else | |
1801 | __trace_add_new_event(call, tr, | |
1802 | &ftrace_event_id_fops, | |
1803 | &ftrace_enable_fops, | |
1804 | &ftrace_event_filter_fops, | |
1805 | &ftrace_event_format_fops); | |
1806 | } | |
1807 | } | |
1808 | ||
ec827c7e | 1809 | static struct notifier_block trace_module_nb = { |
6d723736 SR |
1810 | .notifier_call = trace_module_notify, |
1811 | .priority = 0, | |
1812 | }; | |
1813 | ||
e4a9ea5e SR |
1814 | extern struct ftrace_event_call *__start_ftrace_events[]; |
1815 | extern struct ftrace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 1816 | |
020e5f85 LZ |
1817 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
1818 | ||
1819 | static __init int setup_trace_event(char *str) | |
1820 | { | |
1821 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
1822 | ring_buffer_expanded = 1; | |
1823 | tracing_selftest_disabled = 1; | |
1824 | ||
1825 | return 1; | |
1826 | } | |
1827 | __setup("trace_event=", setup_trace_event); | |
1828 | ||
77248221 SR |
1829 | /* Expects to have event_mutex held when called */ |
1830 | static int | |
1831 | create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) | |
ae63b31e SR |
1832 | { |
1833 | struct dentry *d_events; | |
1834 | struct dentry *entry; | |
1835 | ||
1836 | entry = debugfs_create_file("set_event", 0644, parent, | |
1837 | tr, &ftrace_set_event_fops); | |
1838 | if (!entry) { | |
1839 | pr_warning("Could not create debugfs 'set_event' entry\n"); | |
1840 | return -ENOMEM; | |
1841 | } | |
1842 | ||
1843 | d_events = debugfs_create_dir("events", parent); | |
277ba044 | 1844 | if (!d_events) { |
ae63b31e | 1845 | pr_warning("Could not create debugfs 'events' directory\n"); |
277ba044 SR |
1846 | return -ENOMEM; |
1847 | } | |
ae63b31e SR |
1848 | |
1849 | /* ring buffer internal formats */ | |
1850 | trace_create_file("header_page", 0444, d_events, | |
1851 | ring_buffer_print_page_header, | |
1852 | &ftrace_show_header_fops); | |
1853 | ||
1854 | trace_create_file("header_event", 0444, d_events, | |
1855 | ring_buffer_print_entry_header, | |
1856 | &ftrace_show_header_fops); | |
1857 | ||
1858 | trace_create_file("enable", 0644, d_events, | |
1859 | tr, &ftrace_tr_enable_fops); | |
1860 | ||
1861 | tr->event_dir = d_events; | |
77248221 SR |
1862 | |
1863 | return 0; | |
1864 | } | |
1865 | ||
1866 | /** | |
1867 | * event_trace_add_tracer - add a instance of a trace_array to events | |
1868 | * @parent: The parent dentry to place the files/directories for events in | |
1869 | * @tr: The trace array associated with these events | |
1870 | * | |
1871 | * When a new instance is created, it needs to set up its events | |
1872 | * directory, as well as other files associated with events. It also | |
1873 | * creates the event hierachry in the @parent/events directory. | |
1874 | * | |
1875 | * Returns 0 on success. | |
1876 | */ | |
1877 | int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) | |
1878 | { | |
1879 | int ret; | |
1880 | ||
1881 | mutex_lock(&event_mutex); | |
1882 | ||
1883 | ret = create_event_toplevel_files(parent, tr); | |
1884 | if (ret) | |
1885 | goto out_unlock; | |
1886 | ||
277ba044 | 1887 | down_write(&trace_event_mutex); |
ae63b31e | 1888 | __trace_add_event_dirs(tr); |
277ba044 SR |
1889 | up_write(&trace_event_mutex); |
1890 | ||
77248221 | 1891 | out_unlock: |
277ba044 | 1892 | mutex_unlock(&event_mutex); |
ae63b31e | 1893 | |
77248221 SR |
1894 | return ret; |
1895 | } | |
1896 | ||
1897 | /* | |
1898 | * The top trace array already had its file descriptors created. | |
1899 | * Now the files themselves need to be created. | |
1900 | */ | |
1901 | static __init int | |
1902 | early_event_add_tracer(struct dentry *parent, struct trace_array *tr) | |
1903 | { | |
1904 | int ret; | |
1905 | ||
1906 | mutex_lock(&event_mutex); | |
1907 | ||
1908 | ret = create_event_toplevel_files(parent, tr); | |
1909 | if (ret) | |
1910 | goto out_unlock; | |
1911 | ||
1912 | down_write(&trace_event_mutex); | |
1913 | __trace_early_add_event_dirs(tr); | |
1914 | up_write(&trace_event_mutex); | |
1915 | ||
1916 | out_unlock: | |
1917 | mutex_unlock(&event_mutex); | |
1918 | ||
1919 | return ret; | |
ae63b31e SR |
1920 | } |
1921 | ||
0c8916c3 SR |
1922 | int event_trace_del_tracer(struct trace_array *tr) |
1923 | { | |
1924 | /* Disable any running events */ | |
1925 | __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); | |
1926 | ||
1927 | mutex_lock(&event_mutex); | |
1928 | ||
1929 | down_write(&trace_event_mutex); | |
1930 | __trace_remove_event_dirs(tr); | |
1931 | debugfs_remove_recursive(tr->event_dir); | |
1932 | up_write(&trace_event_mutex); | |
1933 | ||
1934 | tr->event_dir = NULL; | |
1935 | ||
1936 | mutex_unlock(&event_mutex); | |
1937 | ||
1938 | return 0; | |
1939 | } | |
1940 | ||
d1a29143 SR |
1941 | static __init int event_trace_memsetup(void) |
1942 | { | |
1943 | field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); | |
1944 | file_cachep = KMEM_CACHE(ftrace_event_file, SLAB_PANIC); | |
1945 | return 0; | |
1946 | } | |
1947 | ||
8781915a EG |
1948 | static __init int event_trace_enable(void) |
1949 | { | |
ae63b31e | 1950 | struct trace_array *tr = top_trace_array(); |
8781915a EG |
1951 | struct ftrace_event_call **iter, *call; |
1952 | char *buf = bootup_event_buf; | |
1953 | char *token; | |
1954 | int ret; | |
1955 | ||
1956 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { | |
1957 | ||
1958 | call = *iter; | |
1959 | ret = event_init(call); | |
1960 | if (!ret) | |
1961 | list_add(&call->list, &ftrace_events); | |
1962 | } | |
1963 | ||
77248221 SR |
1964 | /* |
1965 | * We need the top trace array to have a working set of trace | |
1966 | * points at early init, before the debug files and directories | |
1967 | * are created. Create the file entries now, and attach them | |
1968 | * to the actual file dentries later. | |
1969 | */ | |
1970 | __trace_early_add_events(tr); | |
1971 | ||
8781915a EG |
1972 | while (true) { |
1973 | token = strsep(&buf, ","); | |
1974 | ||
1975 | if (!token) | |
1976 | break; | |
1977 | if (!*token) | |
1978 | continue; | |
1979 | ||
ae63b31e | 1980 | ret = ftrace_set_clr_event(tr, token, 1); |
8781915a EG |
1981 | if (ret) |
1982 | pr_warn("Failed to enable trace event: %s\n", token); | |
1983 | } | |
81698831 SR |
1984 | |
1985 | trace_printk_start_comm(); | |
1986 | ||
8781915a EG |
1987 | return 0; |
1988 | } | |
1989 | ||
b77e38aa SR |
1990 | static __init int event_trace_init(void) |
1991 | { | |
ae63b31e | 1992 | struct trace_array *tr; |
b77e38aa SR |
1993 | struct dentry *d_tracer; |
1994 | struct dentry *entry; | |
6d723736 | 1995 | int ret; |
b77e38aa | 1996 | |
ae63b31e SR |
1997 | tr = top_trace_array(); |
1998 | ||
b77e38aa SR |
1999 | d_tracer = tracing_init_dentry(); |
2000 | if (!d_tracer) | |
2001 | return 0; | |
2002 | ||
2314c4ae | 2003 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
ae63b31e | 2004 | tr, &ftrace_avail_fops); |
2314c4ae SR |
2005 | if (!entry) |
2006 | pr_warning("Could not create debugfs " | |
2007 | "'available_events' entry\n"); | |
2008 | ||
8728fe50 LZ |
2009 | if (trace_define_common_fields()) |
2010 | pr_warning("tracing: Failed to allocate common fields"); | |
2011 | ||
77248221 | 2012 | ret = early_event_add_tracer(d_tracer, tr); |
ae63b31e SR |
2013 | if (ret) |
2014 | return ret; | |
020e5f85 | 2015 | |
6d723736 | 2016 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 2017 | if (ret) |
6d723736 SR |
2018 | pr_warning("Failed to register trace events module notifier\n"); |
2019 | ||
b77e38aa SR |
2020 | return 0; |
2021 | } | |
d1a29143 | 2022 | early_initcall(event_trace_memsetup); |
8781915a | 2023 | core_initcall(event_trace_enable); |
b77e38aa | 2024 | fs_initcall(event_trace_init); |
e6187007 SR |
2025 | |
2026 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
2027 | ||
2028 | static DEFINE_SPINLOCK(test_spinlock); | |
2029 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
2030 | static DEFINE_MUTEX(test_mutex); | |
2031 | ||
2032 | static __init void test_work(struct work_struct *dummy) | |
2033 | { | |
2034 | spin_lock(&test_spinlock); | |
2035 | spin_lock_irq(&test_spinlock_irq); | |
2036 | udelay(1); | |
2037 | spin_unlock_irq(&test_spinlock_irq); | |
2038 | spin_unlock(&test_spinlock); | |
2039 | ||
2040 | mutex_lock(&test_mutex); | |
2041 | msleep(1); | |
2042 | mutex_unlock(&test_mutex); | |
2043 | } | |
2044 | ||
2045 | static __init int event_test_thread(void *unused) | |
2046 | { | |
2047 | void *test_malloc; | |
2048 | ||
2049 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
2050 | if (!test_malloc) | |
2051 | pr_info("failed to kmalloc\n"); | |
2052 | ||
2053 | schedule_on_each_cpu(test_work); | |
2054 | ||
2055 | kfree(test_malloc); | |
2056 | ||
2057 | set_current_state(TASK_INTERRUPTIBLE); | |
2058 | while (!kthread_should_stop()) | |
2059 | schedule(); | |
2060 | ||
2061 | return 0; | |
2062 | } | |
2063 | ||
2064 | /* | |
2065 | * Do various things that may trigger events. | |
2066 | */ | |
2067 | static __init void event_test_stuff(void) | |
2068 | { | |
2069 | struct task_struct *test_thread; | |
2070 | ||
2071 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
2072 | msleep(1); | |
2073 | kthread_stop(test_thread); | |
2074 | } | |
2075 | ||
2076 | /* | |
2077 | * For every trace event defined, we will test each trace point separately, | |
2078 | * and then by groups, and finally all trace points. | |
2079 | */ | |
9ea21c1e | 2080 | static __init void event_trace_self_tests(void) |
e6187007 | 2081 | { |
ae63b31e SR |
2082 | struct ftrace_subsystem_dir *dir; |
2083 | struct ftrace_event_file *file; | |
e6187007 SR |
2084 | struct ftrace_event_call *call; |
2085 | struct event_subsystem *system; | |
ae63b31e | 2086 | struct trace_array *tr; |
e6187007 SR |
2087 | int ret; |
2088 | ||
ae63b31e SR |
2089 | tr = top_trace_array(); |
2090 | ||
e6187007 SR |
2091 | pr_info("Running tests on trace events:\n"); |
2092 | ||
ae63b31e SR |
2093 | list_for_each_entry(file, &tr->events, list) { |
2094 | ||
2095 | call = file->event_call; | |
e6187007 | 2096 | |
2239291a SR |
2097 | /* Only test those that have a probe */ |
2098 | if (!call->class || !call->class->probe) | |
e6187007 SR |
2099 | continue; |
2100 | ||
1f5a6b45 SR |
2101 | /* |
2102 | * Testing syscall events here is pretty useless, but | |
2103 | * we still do it if configured. But this is time consuming. | |
2104 | * What we really need is a user thread to perform the | |
2105 | * syscalls as we test. | |
2106 | */ | |
2107 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
2108 | if (call->class->system && |
2109 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
2110 | continue; |
2111 | #endif | |
2112 | ||
e6187007 SR |
2113 | pr_info("Testing event %s: ", call->name); |
2114 | ||
2115 | /* | |
2116 | * If an event is already enabled, someone is using | |
2117 | * it and the self test should not be on. | |
2118 | */ | |
ae63b31e | 2119 | if (file->flags & FTRACE_EVENT_FL_ENABLED) { |
e6187007 SR |
2120 | pr_warning("Enabled event during self test!\n"); |
2121 | WARN_ON_ONCE(1); | |
2122 | continue; | |
2123 | } | |
2124 | ||
ae63b31e | 2125 | ftrace_event_enable_disable(file, 1); |
e6187007 | 2126 | event_test_stuff(); |
ae63b31e | 2127 | ftrace_event_enable_disable(file, 0); |
e6187007 SR |
2128 | |
2129 | pr_cont("OK\n"); | |
2130 | } | |
2131 | ||
2132 | /* Now test at the sub system level */ | |
2133 | ||
2134 | pr_info("Running tests on trace event systems:\n"); | |
2135 | ||
ae63b31e SR |
2136 | list_for_each_entry(dir, &tr->systems, list) { |
2137 | ||
2138 | system = dir->subsystem; | |
e6187007 SR |
2139 | |
2140 | /* the ftrace system is special, skip it */ | |
2141 | if (strcmp(system->name, "ftrace") == 0) | |
2142 | continue; | |
2143 | ||
2144 | pr_info("Testing event system %s: ", system->name); | |
2145 | ||
ae63b31e | 2146 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
e6187007 SR |
2147 | if (WARN_ON_ONCE(ret)) { |
2148 | pr_warning("error enabling system %s\n", | |
2149 | system->name); | |
2150 | continue; | |
2151 | } | |
2152 | ||
2153 | event_test_stuff(); | |
2154 | ||
ae63b31e | 2155 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
76bab1b7 | 2156 | if (WARN_ON_ONCE(ret)) { |
e6187007 SR |
2157 | pr_warning("error disabling system %s\n", |
2158 | system->name); | |
76bab1b7 YL |
2159 | continue; |
2160 | } | |
e6187007 SR |
2161 | |
2162 | pr_cont("OK\n"); | |
2163 | } | |
2164 | ||
2165 | /* Test with all events enabled */ | |
2166 | ||
2167 | pr_info("Running tests on all trace events:\n"); | |
2168 | pr_info("Testing all events: "); | |
2169 | ||
ae63b31e | 2170 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
e6187007 | 2171 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 2172 | pr_warning("error enabling all events\n"); |
9ea21c1e | 2173 | return; |
e6187007 SR |
2174 | } |
2175 | ||
2176 | event_test_stuff(); | |
2177 | ||
2178 | /* reset sysname */ | |
ae63b31e | 2179 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
e6187007 SR |
2180 | if (WARN_ON_ONCE(ret)) { |
2181 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 2182 | return; |
e6187007 SR |
2183 | } |
2184 | ||
2185 | pr_cont("OK\n"); | |
9ea21c1e SR |
2186 | } |
2187 | ||
2188 | #ifdef CONFIG_FUNCTION_TRACER | |
2189 | ||
245b2e70 | 2190 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e SR |
2191 | |
2192 | static void | |
2f5f6ad9 | 2193 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 2194 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
9ea21c1e SR |
2195 | { |
2196 | struct ring_buffer_event *event; | |
e77405ad | 2197 | struct ring_buffer *buffer; |
9ea21c1e SR |
2198 | struct ftrace_entry *entry; |
2199 | unsigned long flags; | |
2200 | long disabled; | |
9ea21c1e SR |
2201 | int cpu; |
2202 | int pc; | |
2203 | ||
2204 | pc = preempt_count(); | |
5168ae50 | 2205 | preempt_disable_notrace(); |
9ea21c1e | 2206 | cpu = raw_smp_processor_id(); |
245b2e70 | 2207 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
2208 | |
2209 | if (disabled != 1) | |
2210 | goto out; | |
2211 | ||
2212 | local_save_flags(flags); | |
2213 | ||
e77405ad SR |
2214 | event = trace_current_buffer_lock_reserve(&buffer, |
2215 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
2216 | flags, pc); |
2217 | if (!event) | |
2218 | goto out; | |
2219 | entry = ring_buffer_event_data(event); | |
2220 | entry->ip = ip; | |
2221 | entry->parent_ip = parent_ip; | |
2222 | ||
0d5c6e1c | 2223 | trace_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
2224 | |
2225 | out: | |
245b2e70 | 2226 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 2227 | preempt_enable_notrace(); |
9ea21c1e SR |
2228 | } |
2229 | ||
2230 | static struct ftrace_ops trace_ops __initdata = | |
2231 | { | |
2232 | .func = function_test_events_call, | |
4740974a | 2233 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
9ea21c1e SR |
2234 | }; |
2235 | ||
2236 | static __init void event_trace_self_test_with_function(void) | |
2237 | { | |
17bb615a SR |
2238 | int ret; |
2239 | ret = register_ftrace_function(&trace_ops); | |
2240 | if (WARN_ON(ret < 0)) { | |
2241 | pr_info("Failed to enable function tracer for event tests\n"); | |
2242 | return; | |
2243 | } | |
9ea21c1e SR |
2244 | pr_info("Running tests again, along with the function tracer\n"); |
2245 | event_trace_self_tests(); | |
2246 | unregister_ftrace_function(&trace_ops); | |
2247 | } | |
2248 | #else | |
2249 | static __init void event_trace_self_test_with_function(void) | |
2250 | { | |
2251 | } | |
2252 | #endif | |
2253 | ||
2254 | static __init int event_trace_self_tests_init(void) | |
2255 | { | |
020e5f85 LZ |
2256 | if (!tracing_selftest_disabled) { |
2257 | event_trace_self_tests(); | |
2258 | event_trace_self_test_with_function(); | |
2259 | } | |
e6187007 SR |
2260 | |
2261 | return 0; | |
2262 | } | |
2263 | ||
28d20e2d | 2264 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
2265 | |
2266 | #endif |