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Commit | Line | Data |
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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; |
575380da SRRH |
248 | |
249 | /* WAS_ENABLED gets set but never cleared. */ | |
250 | call->flags |= TRACE_EVENT_FL_WAS_ENABLED; | |
fd994989 | 251 | } |
fd994989 SR |
252 | break; |
253 | } | |
3b8e4273 LZ |
254 | |
255 | return ret; | |
fd994989 SR |
256 | } |
257 | ||
ae63b31e | 258 | static void ftrace_clear_events(struct trace_array *tr) |
0e907c99 | 259 | { |
ae63b31e | 260 | struct ftrace_event_file *file; |
0e907c99 Z |
261 | |
262 | mutex_lock(&event_mutex); | |
ae63b31e SR |
263 | list_for_each_entry(file, &tr->events, list) { |
264 | ftrace_event_enable_disable(file, 0); | |
0e907c99 Z |
265 | } |
266 | mutex_unlock(&event_mutex); | |
267 | } | |
268 | ||
e9dbfae5 SR |
269 | static void __put_system(struct event_subsystem *system) |
270 | { | |
271 | struct event_filter *filter = system->filter; | |
272 | ||
273 | WARN_ON_ONCE(system->ref_count == 0); | |
274 | if (--system->ref_count) | |
275 | return; | |
276 | ||
ae63b31e SR |
277 | list_del(&system->list); |
278 | ||
e9dbfae5 SR |
279 | if (filter) { |
280 | kfree(filter->filter_string); | |
281 | kfree(filter); | |
282 | } | |
e9dbfae5 SR |
283 | kfree(system); |
284 | } | |
285 | ||
286 | static void __get_system(struct event_subsystem *system) | |
287 | { | |
288 | WARN_ON_ONCE(system->ref_count == 0); | |
289 | system->ref_count++; | |
290 | } | |
291 | ||
ae63b31e SR |
292 | static void __get_system_dir(struct ftrace_subsystem_dir *dir) |
293 | { | |
294 | WARN_ON_ONCE(dir->ref_count == 0); | |
295 | dir->ref_count++; | |
296 | __get_system(dir->subsystem); | |
297 | } | |
298 | ||
299 | static void __put_system_dir(struct ftrace_subsystem_dir *dir) | |
300 | { | |
301 | WARN_ON_ONCE(dir->ref_count == 0); | |
302 | /* If the subsystem is about to be freed, the dir must be too */ | |
303 | WARN_ON_ONCE(dir->subsystem->ref_count == 1 && dir->ref_count != 1); | |
304 | ||
305 | __put_system(dir->subsystem); | |
306 | if (!--dir->ref_count) | |
307 | kfree(dir); | |
308 | } | |
309 | ||
310 | static void put_system(struct ftrace_subsystem_dir *dir) | |
e9dbfae5 SR |
311 | { |
312 | mutex_lock(&event_mutex); | |
ae63b31e | 313 | __put_system_dir(dir); |
e9dbfae5 SR |
314 | mutex_unlock(&event_mutex); |
315 | } | |
316 | ||
8f31bfe5 LZ |
317 | /* |
318 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
319 | */ | |
ae63b31e SR |
320 | static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, |
321 | const char *sub, const char *event, int set) | |
b77e38aa | 322 | { |
ae63b31e | 323 | struct ftrace_event_file *file; |
a59fd602 | 324 | struct ftrace_event_call *call; |
29f93943 | 325 | int ret = -EINVAL; |
8f31bfe5 LZ |
326 | |
327 | mutex_lock(&event_mutex); | |
ae63b31e SR |
328 | list_for_each_entry(file, &tr->events, list) { |
329 | ||
330 | call = file->event_call; | |
8f31bfe5 | 331 | |
a1d0ce82 | 332 | if (!call->name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
333 | continue; |
334 | ||
9b63776f SR |
335 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
336 | continue; | |
337 | ||
8f31bfe5 LZ |
338 | if (match && |
339 | strcmp(match, call->name) != 0 && | |
8f082018 | 340 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
341 | continue; |
342 | ||
8f082018 | 343 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
344 | continue; |
345 | ||
346 | if (event && strcmp(event, call->name) != 0) | |
347 | continue; | |
348 | ||
ae63b31e | 349 | ftrace_event_enable_disable(file, set); |
8f31bfe5 LZ |
350 | |
351 | ret = 0; | |
352 | } | |
353 | mutex_unlock(&event_mutex); | |
354 | ||
355 | return ret; | |
356 | } | |
357 | ||
ae63b31e | 358 | static int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set) |
8f31bfe5 | 359 | { |
b628b3e6 | 360 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
361 | |
362 | /* | |
363 | * The buf format can be <subsystem>:<event-name> | |
364 | * *:<event-name> means any event by that name. | |
365 | * :<event-name> is the same. | |
366 | * | |
367 | * <subsystem>:* means all events in that subsystem | |
368 | * <subsystem>: means the same. | |
369 | * | |
370 | * <name> (no ':') means all events in a subsystem with | |
371 | * the name <name> or any event that matches <name> | |
372 | */ | |
373 | ||
374 | match = strsep(&buf, ":"); | |
375 | if (buf) { | |
376 | sub = match; | |
377 | event = buf; | |
378 | match = NULL; | |
379 | ||
380 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
381 | sub = NULL; | |
382 | if (!strlen(event) || strcmp(event, "*") == 0) | |
383 | event = NULL; | |
384 | } | |
b77e38aa | 385 | |
ae63b31e | 386 | return __ftrace_set_clr_event(tr, match, sub, event, set); |
b77e38aa SR |
387 | } |
388 | ||
4671c794 SR |
389 | /** |
390 | * trace_set_clr_event - enable or disable an event | |
391 | * @system: system name to match (NULL for any system) | |
392 | * @event: event name to match (NULL for all events, within system) | |
393 | * @set: 1 to enable, 0 to disable | |
394 | * | |
395 | * This is a way for other parts of the kernel to enable or disable | |
396 | * event recording. | |
397 | * | |
398 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
399 | * registered events. | |
400 | */ | |
401 | int trace_set_clr_event(const char *system, const char *event, int set) | |
402 | { | |
ae63b31e SR |
403 | struct trace_array *tr = top_trace_array(); |
404 | ||
405 | return __ftrace_set_clr_event(tr, NULL, system, event, set); | |
4671c794 | 406 | } |
56355b83 | 407 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 408 | |
b77e38aa SR |
409 | /* 128 should be much more than enough */ |
410 | #define EVENT_BUF_SIZE 127 | |
411 | ||
412 | static ssize_t | |
413 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
414 | size_t cnt, loff_t *ppos) | |
415 | { | |
48966364 | 416 | struct trace_parser parser; |
ae63b31e SR |
417 | struct seq_file *m = file->private_data; |
418 | struct trace_array *tr = m->private; | |
4ba7978e | 419 | ssize_t read, ret; |
b77e38aa | 420 | |
4ba7978e | 421 | if (!cnt) |
b77e38aa SR |
422 | return 0; |
423 | ||
1852fcce SR |
424 | ret = tracing_update_buffers(); |
425 | if (ret < 0) | |
426 | return ret; | |
427 | ||
48966364 | 428 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
429 | return -ENOMEM; |
430 | ||
48966364 | 431 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
432 | ||
4ba7978e | 433 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 434 | int set = 1; |
b77e38aa | 435 | |
48966364 | 436 | if (*parser.buffer == '!') |
b77e38aa | 437 | set = 0; |
b77e38aa | 438 | |
48966364 | 439 | parser.buffer[parser.idx] = 0; |
440 | ||
ae63b31e | 441 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
b77e38aa | 442 | if (ret) |
48966364 | 443 | goto out_put; |
b77e38aa | 444 | } |
b77e38aa SR |
445 | |
446 | ret = read; | |
447 | ||
48966364 | 448 | out_put: |
449 | trace_parser_put(&parser); | |
b77e38aa SR |
450 | |
451 | return ret; | |
452 | } | |
453 | ||
454 | static void * | |
455 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
456 | { | |
ae63b31e SR |
457 | struct ftrace_event_file *file = v; |
458 | struct ftrace_event_call *call; | |
459 | struct trace_array *tr = m->private; | |
b77e38aa SR |
460 | |
461 | (*pos)++; | |
462 | ||
ae63b31e SR |
463 | list_for_each_entry_continue(file, &tr->events, list) { |
464 | call = file->event_call; | |
40e26815 SR |
465 | /* |
466 | * The ftrace subsystem is for showing formats only. | |
467 | * They can not be enabled or disabled via the event files. | |
468 | */ | |
a1d0ce82 | 469 | if (call->class && call->class->reg) |
ae63b31e | 470 | return file; |
40e26815 | 471 | } |
b77e38aa | 472 | |
30bd39cd | 473 | return NULL; |
b77e38aa SR |
474 | } |
475 | ||
476 | static void *t_start(struct seq_file *m, loff_t *pos) | |
477 | { | |
ae63b31e SR |
478 | struct ftrace_event_file *file; |
479 | struct trace_array *tr = m->private; | |
e1c7e2a6 LZ |
480 | loff_t l; |
481 | ||
20c8928a | 482 | mutex_lock(&event_mutex); |
e1c7e2a6 | 483 | |
ae63b31e | 484 | file = list_entry(&tr->events, struct ftrace_event_file, list); |
e1c7e2a6 | 485 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
486 | file = t_next(m, file, &l); |
487 | if (!file) | |
e1c7e2a6 LZ |
488 | break; |
489 | } | |
ae63b31e | 490 | return file; |
b77e38aa SR |
491 | } |
492 | ||
493 | static void * | |
494 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
495 | { | |
ae63b31e SR |
496 | struct ftrace_event_file *file = v; |
497 | struct trace_array *tr = m->private; | |
b77e38aa SR |
498 | |
499 | (*pos)++; | |
500 | ||
ae63b31e SR |
501 | list_for_each_entry_continue(file, &tr->events, list) { |
502 | if (file->flags & FTRACE_EVENT_FL_ENABLED) | |
503 | return file; | |
b77e38aa SR |
504 | } |
505 | ||
30bd39cd | 506 | return NULL; |
b77e38aa SR |
507 | } |
508 | ||
509 | static void *s_start(struct seq_file *m, loff_t *pos) | |
510 | { | |
ae63b31e SR |
511 | struct ftrace_event_file *file; |
512 | struct trace_array *tr = m->private; | |
e1c7e2a6 LZ |
513 | loff_t l; |
514 | ||
20c8928a | 515 | mutex_lock(&event_mutex); |
e1c7e2a6 | 516 | |
ae63b31e | 517 | file = list_entry(&tr->events, struct ftrace_event_file, list); |
e1c7e2a6 | 518 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
519 | file = s_next(m, file, &l); |
520 | if (!file) | |
e1c7e2a6 LZ |
521 | break; |
522 | } | |
ae63b31e | 523 | return file; |
b77e38aa SR |
524 | } |
525 | ||
526 | static int t_show(struct seq_file *m, void *v) | |
527 | { | |
ae63b31e SR |
528 | struct ftrace_event_file *file = v; |
529 | struct ftrace_event_call *call = file->event_call; | |
b77e38aa | 530 | |
8f082018 SR |
531 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
532 | seq_printf(m, "%s:", call->class->system); | |
b77e38aa SR |
533 | seq_printf(m, "%s\n", call->name); |
534 | ||
535 | return 0; | |
536 | } | |
537 | ||
538 | static void t_stop(struct seq_file *m, void *p) | |
539 | { | |
20c8928a | 540 | mutex_unlock(&event_mutex); |
b77e38aa SR |
541 | } |
542 | ||
1473e441 SR |
543 | static ssize_t |
544 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
545 | loff_t *ppos) | |
546 | { | |
ae63b31e | 547 | struct ftrace_event_file *file = filp->private_data; |
1473e441 SR |
548 | char *buf; |
549 | ||
ae63b31e | 550 | if (file->flags & FTRACE_EVENT_FL_ENABLED) |
1473e441 SR |
551 | buf = "1\n"; |
552 | else | |
553 | buf = "0\n"; | |
554 | ||
555 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
556 | } | |
557 | ||
558 | static ssize_t | |
559 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
560 | loff_t *ppos) | |
561 | { | |
ae63b31e | 562 | struct ftrace_event_file *file = filp->private_data; |
1473e441 SR |
563 | unsigned long val; |
564 | int ret; | |
565 | ||
ae63b31e SR |
566 | if (!file) |
567 | return -EINVAL; | |
568 | ||
22fe9b54 PH |
569 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
570 | if (ret) | |
1473e441 SR |
571 | return ret; |
572 | ||
1852fcce SR |
573 | ret = tracing_update_buffers(); |
574 | if (ret < 0) | |
575 | return ret; | |
576 | ||
1473e441 SR |
577 | switch (val) { |
578 | case 0: | |
1473e441 | 579 | case 1: |
11a241a3 | 580 | mutex_lock(&event_mutex); |
ae63b31e | 581 | ret = ftrace_event_enable_disable(file, val); |
11a241a3 | 582 | mutex_unlock(&event_mutex); |
1473e441 SR |
583 | break; |
584 | ||
585 | default: | |
586 | return -EINVAL; | |
587 | } | |
588 | ||
589 | *ppos += cnt; | |
590 | ||
3b8e4273 | 591 | return ret ? ret : cnt; |
1473e441 SR |
592 | } |
593 | ||
8ae79a13 SR |
594 | static ssize_t |
595 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
596 | loff_t *ppos) | |
597 | { | |
c142b15d | 598 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
ae63b31e SR |
599 | struct ftrace_subsystem_dir *dir = filp->private_data; |
600 | struct event_subsystem *system = dir->subsystem; | |
8ae79a13 | 601 | struct ftrace_event_call *call; |
ae63b31e SR |
602 | struct ftrace_event_file *file; |
603 | struct trace_array *tr = dir->tr; | |
8ae79a13 | 604 | char buf[2]; |
c142b15d | 605 | int set = 0; |
8ae79a13 SR |
606 | int ret; |
607 | ||
8ae79a13 | 608 | mutex_lock(&event_mutex); |
ae63b31e SR |
609 | list_for_each_entry(file, &tr->events, list) { |
610 | call = file->event_call; | |
a1d0ce82 | 611 | if (!call->name || !call->class || !call->class->reg) |
8ae79a13 SR |
612 | continue; |
613 | ||
40ee4dff | 614 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
615 | continue; |
616 | ||
617 | /* | |
618 | * We need to find out if all the events are set | |
619 | * or if all events or cleared, or if we have | |
620 | * a mixture. | |
621 | */ | |
ae63b31e | 622 | set |= (1 << !!(file->flags & FTRACE_EVENT_FL_ENABLED)); |
c142b15d | 623 | |
8ae79a13 SR |
624 | /* |
625 | * If we have a mixture, no need to look further. | |
626 | */ | |
c142b15d | 627 | if (set == 3) |
8ae79a13 SR |
628 | break; |
629 | } | |
630 | mutex_unlock(&event_mutex); | |
631 | ||
c142b15d | 632 | buf[0] = set_to_char[set]; |
8ae79a13 | 633 | buf[1] = '\n'; |
8ae79a13 SR |
634 | |
635 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
636 | ||
637 | return ret; | |
638 | } | |
639 | ||
640 | static ssize_t | |
641 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
642 | loff_t *ppos) | |
643 | { | |
ae63b31e SR |
644 | struct ftrace_subsystem_dir *dir = filp->private_data; |
645 | struct event_subsystem *system = dir->subsystem; | |
40ee4dff | 646 | const char *name = NULL; |
8ae79a13 | 647 | unsigned long val; |
8ae79a13 SR |
648 | ssize_t ret; |
649 | ||
22fe9b54 PH |
650 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
651 | if (ret) | |
8ae79a13 SR |
652 | return ret; |
653 | ||
654 | ret = tracing_update_buffers(); | |
655 | if (ret < 0) | |
656 | return ret; | |
657 | ||
8f31bfe5 | 658 | if (val != 0 && val != 1) |
8ae79a13 | 659 | return -EINVAL; |
8ae79a13 | 660 | |
40ee4dff SR |
661 | /* |
662 | * Opening of "enable" adds a ref count to system, | |
663 | * so the name is safe to use. | |
664 | */ | |
665 | if (system) | |
666 | name = system->name; | |
667 | ||
ae63b31e | 668 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
8ae79a13 | 669 | if (ret) |
8f31bfe5 | 670 | goto out; |
8ae79a13 SR |
671 | |
672 | ret = cnt; | |
673 | ||
8f31bfe5 | 674 | out: |
8ae79a13 SR |
675 | *ppos += cnt; |
676 | ||
677 | return ret; | |
678 | } | |
679 | ||
2a37a3df SR |
680 | enum { |
681 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
682 | FORMAT_FIELD_SEPERATOR = 2, |
683 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
684 | }; |
685 | ||
686 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 687 | { |
2a37a3df | 688 | struct ftrace_event_call *call = m->private; |
5a65e956 | 689 | struct ftrace_event_field *field; |
86397dc3 LZ |
690 | struct list_head *common_head = &ftrace_common_fields; |
691 | struct list_head *head = trace_get_fields(call); | |
981d081e | 692 | |
2a37a3df | 693 | (*pos)++; |
5a65e956 | 694 | |
2a37a3df SR |
695 | switch ((unsigned long)v) { |
696 | case FORMAT_HEADER: | |
86397dc3 LZ |
697 | if (unlikely(list_empty(common_head))) |
698 | return NULL; | |
699 | ||
700 | field = list_entry(common_head->prev, | |
701 | struct ftrace_event_field, link); | |
702 | return field; | |
5a65e956 | 703 | |
86397dc3 | 704 | case FORMAT_FIELD_SEPERATOR: |
2a37a3df SR |
705 | if (unlikely(list_empty(head))) |
706 | return NULL; | |
5a65e956 | 707 | |
2a37a3df SR |
708 | field = list_entry(head->prev, struct ftrace_event_field, link); |
709 | return field; | |
5a65e956 | 710 | |
2a37a3df SR |
711 | case FORMAT_PRINTFMT: |
712 | /* all done */ | |
713 | return NULL; | |
5a65e956 LJ |
714 | } |
715 | ||
2a37a3df | 716 | field = v; |
86397dc3 LZ |
717 | if (field->link.prev == common_head) |
718 | return (void *)FORMAT_FIELD_SEPERATOR; | |
719 | else if (field->link.prev == head) | |
2a37a3df SR |
720 | return (void *)FORMAT_PRINTFMT; |
721 | ||
722 | field = list_entry(field->link.prev, struct ftrace_event_field, link); | |
723 | ||
2a37a3df | 724 | return field; |
8728fe50 | 725 | } |
5a65e956 | 726 | |
2a37a3df | 727 | static void *f_start(struct seq_file *m, loff_t *pos) |
8728fe50 | 728 | { |
2a37a3df SR |
729 | loff_t l = 0; |
730 | void *p; | |
5a65e956 | 731 | |
2a37a3df SR |
732 | /* Start by showing the header */ |
733 | if (!*pos) | |
734 | return (void *)FORMAT_HEADER; | |
735 | ||
736 | p = (void *)FORMAT_HEADER; | |
737 | do { | |
738 | p = f_next(m, p, &l); | |
739 | } while (p && l < *pos); | |
740 | ||
741 | return p; | |
742 | } | |
743 | ||
744 | static int f_show(struct seq_file *m, void *v) | |
745 | { | |
746 | struct ftrace_event_call *call = m->private; | |
747 | struct ftrace_event_field *field; | |
748 | const char *array_descriptor; | |
749 | ||
750 | switch ((unsigned long)v) { | |
751 | case FORMAT_HEADER: | |
752 | seq_printf(m, "name: %s\n", call->name); | |
753 | seq_printf(m, "ID: %d\n", call->event.type); | |
754 | seq_printf(m, "format:\n"); | |
8728fe50 | 755 | return 0; |
5a65e956 | 756 | |
86397dc3 LZ |
757 | case FORMAT_FIELD_SEPERATOR: |
758 | seq_putc(m, '\n'); | |
759 | return 0; | |
760 | ||
2a37a3df SR |
761 | case FORMAT_PRINTFMT: |
762 | seq_printf(m, "\nprint fmt: %s\n", | |
763 | call->print_fmt); | |
764 | return 0; | |
981d081e | 765 | } |
8728fe50 | 766 | |
2a37a3df | 767 | field = v; |
8728fe50 | 768 | |
2a37a3df SR |
769 | /* |
770 | * Smartly shows the array type(except dynamic array). | |
771 | * Normal: | |
772 | * field:TYPE VAR | |
773 | * If TYPE := TYPE[LEN], it is shown: | |
774 | * field:TYPE VAR[LEN] | |
775 | */ | |
776 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 777 | |
2a37a3df SR |
778 | if (!strncmp(field->type, "__data_loc", 10)) |
779 | array_descriptor = NULL; | |
8728fe50 | 780 | |
2a37a3df SR |
781 | if (!array_descriptor) |
782 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
783 | field->type, field->name, field->offset, | |
784 | field->size, !!field->is_signed); | |
785 | else | |
786 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
787 | (int)(array_descriptor - field->type), | |
788 | field->type, field->name, | |
789 | array_descriptor, field->offset, | |
790 | field->size, !!field->is_signed); | |
8728fe50 | 791 | |
2a37a3df SR |
792 | return 0; |
793 | } | |
5a65e956 | 794 | |
2a37a3df SR |
795 | static void f_stop(struct seq_file *m, void *p) |
796 | { | |
797 | } | |
981d081e | 798 | |
2a37a3df SR |
799 | static const struct seq_operations trace_format_seq_ops = { |
800 | .start = f_start, | |
801 | .next = f_next, | |
802 | .stop = f_stop, | |
803 | .show = f_show, | |
804 | }; | |
805 | ||
806 | static int trace_format_open(struct inode *inode, struct file *file) | |
807 | { | |
808 | struct ftrace_event_call *call = inode->i_private; | |
809 | struct seq_file *m; | |
810 | int ret; | |
811 | ||
812 | ret = seq_open(file, &trace_format_seq_ops); | |
813 | if (ret < 0) | |
814 | return ret; | |
815 | ||
816 | m = file->private_data; | |
817 | m->private = call; | |
818 | ||
819 | return 0; | |
981d081e SR |
820 | } |
821 | ||
23725aee PZ |
822 | static ssize_t |
823 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
824 | { | |
825 | struct ftrace_event_call *call = filp->private_data; | |
826 | struct trace_seq *s; | |
827 | int r; | |
828 | ||
829 | if (*ppos) | |
830 | return 0; | |
831 | ||
832 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
833 | if (!s) | |
834 | return -ENOMEM; | |
835 | ||
836 | trace_seq_init(s); | |
32c0edae | 837 | trace_seq_printf(s, "%d\n", call->event.type); |
23725aee PZ |
838 | |
839 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
840 | s->buffer, s->len); | |
841 | kfree(s); | |
842 | return r; | |
843 | } | |
844 | ||
7ce7e424 TZ |
845 | static ssize_t |
846 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
847 | loff_t *ppos) | |
848 | { | |
849 | struct ftrace_event_call *call = filp->private_data; | |
850 | struct trace_seq *s; | |
851 | int r; | |
852 | ||
853 | if (*ppos) | |
854 | return 0; | |
855 | ||
856 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
857 | if (!s) | |
858 | return -ENOMEM; | |
859 | ||
860 | trace_seq_init(s); | |
861 | ||
8b372562 | 862 | print_event_filter(call, s); |
4bda2d51 | 863 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
864 | |
865 | kfree(s); | |
866 | ||
867 | return r; | |
868 | } | |
869 | ||
870 | static ssize_t | |
871 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
872 | loff_t *ppos) | |
873 | { | |
874 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 875 | char *buf; |
7ce7e424 TZ |
876 | int err; |
877 | ||
8b372562 | 878 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
879 | return -EINVAL; |
880 | ||
8b372562 TZ |
881 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
882 | if (!buf) | |
7ce7e424 TZ |
883 | return -ENOMEM; |
884 | ||
8b372562 TZ |
885 | if (copy_from_user(buf, ubuf, cnt)) { |
886 | free_page((unsigned long) buf); | |
887 | return -EFAULT; | |
7ce7e424 | 888 | } |
8b372562 | 889 | buf[cnt] = '\0'; |
7ce7e424 | 890 | |
8b372562 TZ |
891 | err = apply_event_filter(call, buf); |
892 | free_page((unsigned long) buf); | |
893 | if (err < 0) | |
44e9c8b7 | 894 | return err; |
0a19e53c | 895 | |
7ce7e424 TZ |
896 | *ppos += cnt; |
897 | ||
898 | return cnt; | |
899 | } | |
900 | ||
e9dbfae5 SR |
901 | static LIST_HEAD(event_subsystems); |
902 | ||
903 | static int subsystem_open(struct inode *inode, struct file *filp) | |
904 | { | |
905 | struct event_subsystem *system = NULL; | |
ae63b31e SR |
906 | struct ftrace_subsystem_dir *dir = NULL; /* Initialize for gcc */ |
907 | struct trace_array *tr; | |
e9dbfae5 SR |
908 | int ret; |
909 | ||
910 | /* Make sure the system still exists */ | |
911 | mutex_lock(&event_mutex); | |
ae63b31e SR |
912 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
913 | list_for_each_entry(dir, &tr->systems, list) { | |
914 | if (dir == inode->i_private) { | |
915 | /* Don't open systems with no events */ | |
916 | if (dir->nr_events) { | |
917 | __get_system_dir(dir); | |
918 | system = dir->subsystem; | |
919 | } | |
920 | goto exit_loop; | |
e9dbfae5 | 921 | } |
e9dbfae5 SR |
922 | } |
923 | } | |
ae63b31e | 924 | exit_loop: |
e9dbfae5 SR |
925 | mutex_unlock(&event_mutex); |
926 | ||
ae63b31e | 927 | if (!system) |
e9dbfae5 SR |
928 | return -ENODEV; |
929 | ||
ae63b31e SR |
930 | /* Some versions of gcc think dir can be uninitialized here */ |
931 | WARN_ON(!dir); | |
932 | ||
e9dbfae5 | 933 | ret = tracing_open_generic(inode, filp); |
ae63b31e SR |
934 | if (ret < 0) |
935 | put_system(dir); | |
936 | ||
937 | return ret; | |
938 | } | |
939 | ||
940 | static int system_tr_open(struct inode *inode, struct file *filp) | |
941 | { | |
942 | struct ftrace_subsystem_dir *dir; | |
943 | struct trace_array *tr = inode->i_private; | |
944 | int ret; | |
945 | ||
946 | /* Make a temporary dir that has no system but points to tr */ | |
947 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); | |
948 | if (!dir) | |
949 | return -ENOMEM; | |
950 | ||
951 | dir->tr = tr; | |
952 | ||
953 | ret = tracing_open_generic(inode, filp); | |
954 | if (ret < 0) | |
955 | kfree(dir); | |
956 | ||
957 | filp->private_data = dir; | |
e9dbfae5 SR |
958 | |
959 | return ret; | |
960 | } | |
961 | ||
962 | static int subsystem_release(struct inode *inode, struct file *file) | |
963 | { | |
ae63b31e | 964 | struct ftrace_subsystem_dir *dir = file->private_data; |
e9dbfae5 | 965 | |
ae63b31e SR |
966 | /* |
967 | * If dir->subsystem is NULL, then this is a temporary | |
968 | * descriptor that was made for a trace_array to enable | |
969 | * all subsystems. | |
970 | */ | |
971 | if (dir->subsystem) | |
972 | put_system(dir); | |
973 | else | |
974 | kfree(dir); | |
e9dbfae5 SR |
975 | |
976 | return 0; | |
977 | } | |
978 | ||
cfb180f3 TZ |
979 | static ssize_t |
980 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
981 | loff_t *ppos) | |
982 | { | |
ae63b31e SR |
983 | struct ftrace_subsystem_dir *dir = filp->private_data; |
984 | struct event_subsystem *system = dir->subsystem; | |
cfb180f3 TZ |
985 | struct trace_seq *s; |
986 | int r; | |
987 | ||
988 | if (*ppos) | |
989 | return 0; | |
990 | ||
991 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
992 | if (!s) | |
993 | return -ENOMEM; | |
994 | ||
995 | trace_seq_init(s); | |
996 | ||
8b372562 | 997 | print_subsystem_event_filter(system, s); |
4bda2d51 | 998 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
999 | |
1000 | kfree(s); | |
1001 | ||
1002 | return r; | |
1003 | } | |
1004 | ||
1005 | static ssize_t | |
1006 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1007 | loff_t *ppos) | |
1008 | { | |
ae63b31e | 1009 | struct ftrace_subsystem_dir *dir = filp->private_data; |
8b372562 | 1010 | char *buf; |
cfb180f3 TZ |
1011 | int err; |
1012 | ||
8b372562 | 1013 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
1014 | return -EINVAL; |
1015 | ||
8b372562 TZ |
1016 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
1017 | if (!buf) | |
cfb180f3 TZ |
1018 | return -ENOMEM; |
1019 | ||
8b372562 TZ |
1020 | if (copy_from_user(buf, ubuf, cnt)) { |
1021 | free_page((unsigned long) buf); | |
1022 | return -EFAULT; | |
cfb180f3 | 1023 | } |
8b372562 | 1024 | buf[cnt] = '\0'; |
cfb180f3 | 1025 | |
ae63b31e | 1026 | err = apply_subsystem_event_filter(dir, buf); |
8b372562 TZ |
1027 | free_page((unsigned long) buf); |
1028 | if (err < 0) | |
44e9c8b7 | 1029 | return err; |
cfb180f3 TZ |
1030 | |
1031 | *ppos += cnt; | |
1032 | ||
1033 | return cnt; | |
1034 | } | |
1035 | ||
d1b182a8 SR |
1036 | static ssize_t |
1037 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1038 | { | |
1039 | int (*func)(struct trace_seq *s) = filp->private_data; | |
1040 | struct trace_seq *s; | |
1041 | int r; | |
1042 | ||
1043 | if (*ppos) | |
1044 | return 0; | |
1045 | ||
1046 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1047 | if (!s) | |
1048 | return -ENOMEM; | |
1049 | ||
1050 | trace_seq_init(s); | |
1051 | ||
1052 | func(s); | |
1053 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
1054 | ||
1055 | kfree(s); | |
1056 | ||
1057 | return r; | |
1058 | } | |
1059 | ||
15075cac SR |
1060 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
1061 | static int ftrace_event_set_open(struct inode *inode, struct file *file); | |
1062 | ||
b77e38aa SR |
1063 | static const struct seq_operations show_event_seq_ops = { |
1064 | .start = t_start, | |
1065 | .next = t_next, | |
1066 | .show = t_show, | |
1067 | .stop = t_stop, | |
1068 | }; | |
1069 | ||
1070 | static const struct seq_operations show_set_event_seq_ops = { | |
1071 | .start = s_start, | |
1072 | .next = s_next, | |
1073 | .show = t_show, | |
1074 | .stop = t_stop, | |
1075 | }; | |
1076 | ||
2314c4ae | 1077 | static const struct file_operations ftrace_avail_fops = { |
15075cac | 1078 | .open = ftrace_event_avail_open, |
2314c4ae SR |
1079 | .read = seq_read, |
1080 | .llseek = seq_lseek, | |
1081 | .release = seq_release, | |
1082 | }; | |
1083 | ||
b77e38aa | 1084 | static const struct file_operations ftrace_set_event_fops = { |
15075cac | 1085 | .open = ftrace_event_set_open, |
b77e38aa SR |
1086 | .read = seq_read, |
1087 | .write = ftrace_event_write, | |
1088 | .llseek = seq_lseek, | |
1089 | .release = seq_release, | |
1090 | }; | |
1091 | ||
1473e441 SR |
1092 | static const struct file_operations ftrace_enable_fops = { |
1093 | .open = tracing_open_generic, | |
1094 | .read = event_enable_read, | |
1095 | .write = event_enable_write, | |
6038f373 | 1096 | .llseek = default_llseek, |
1473e441 SR |
1097 | }; |
1098 | ||
981d081e | 1099 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
1100 | .open = trace_format_open, |
1101 | .read = seq_read, | |
1102 | .llseek = seq_lseek, | |
1103 | .release = seq_release, | |
981d081e SR |
1104 | }; |
1105 | ||
23725aee PZ |
1106 | static const struct file_operations ftrace_event_id_fops = { |
1107 | .open = tracing_open_generic, | |
1108 | .read = event_id_read, | |
6038f373 | 1109 | .llseek = default_llseek, |
23725aee PZ |
1110 | }; |
1111 | ||
7ce7e424 TZ |
1112 | static const struct file_operations ftrace_event_filter_fops = { |
1113 | .open = tracing_open_generic, | |
1114 | .read = event_filter_read, | |
1115 | .write = event_filter_write, | |
6038f373 | 1116 | .llseek = default_llseek, |
7ce7e424 TZ |
1117 | }; |
1118 | ||
cfb180f3 | 1119 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 1120 | .open = subsystem_open, |
cfb180f3 TZ |
1121 | .read = subsystem_filter_read, |
1122 | .write = subsystem_filter_write, | |
6038f373 | 1123 | .llseek = default_llseek, |
e9dbfae5 | 1124 | .release = subsystem_release, |
cfb180f3 TZ |
1125 | }; |
1126 | ||
8ae79a13 | 1127 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 1128 | .open = subsystem_open, |
8ae79a13 SR |
1129 | .read = system_enable_read, |
1130 | .write = system_enable_write, | |
6038f373 | 1131 | .llseek = default_llseek, |
40ee4dff | 1132 | .release = subsystem_release, |
8ae79a13 SR |
1133 | }; |
1134 | ||
ae63b31e SR |
1135 | static const struct file_operations ftrace_tr_enable_fops = { |
1136 | .open = system_tr_open, | |
1137 | .read = system_enable_read, | |
1138 | .write = system_enable_write, | |
1139 | .llseek = default_llseek, | |
1140 | .release = subsystem_release, | |
1141 | }; | |
1142 | ||
d1b182a8 SR |
1143 | static const struct file_operations ftrace_show_header_fops = { |
1144 | .open = tracing_open_generic, | |
1145 | .read = show_header, | |
6038f373 | 1146 | .llseek = default_llseek, |
d1b182a8 SR |
1147 | }; |
1148 | ||
ae63b31e SR |
1149 | static int |
1150 | ftrace_event_open(struct inode *inode, struct file *file, | |
1151 | const struct seq_operations *seq_ops) | |
1473e441 | 1152 | { |
ae63b31e SR |
1153 | struct seq_file *m; |
1154 | int ret; | |
1473e441 | 1155 | |
ae63b31e SR |
1156 | ret = seq_open(file, seq_ops); |
1157 | if (ret < 0) | |
1158 | return ret; | |
1159 | m = file->private_data; | |
1160 | /* copy tr over to seq ops */ | |
1161 | m->private = inode->i_private; | |
1473e441 | 1162 | |
ae63b31e | 1163 | return ret; |
1473e441 SR |
1164 | } |
1165 | ||
15075cac SR |
1166 | static int |
1167 | ftrace_event_avail_open(struct inode *inode, struct file *file) | |
1168 | { | |
1169 | const struct seq_operations *seq_ops = &show_event_seq_ops; | |
1170 | ||
ae63b31e | 1171 | return ftrace_event_open(inode, file, seq_ops); |
15075cac SR |
1172 | } |
1173 | ||
1174 | static int | |
1175 | ftrace_event_set_open(struct inode *inode, struct file *file) | |
1176 | { | |
1177 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; | |
ae63b31e | 1178 | struct trace_array *tr = inode->i_private; |
15075cac SR |
1179 | |
1180 | if ((file->f_mode & FMODE_WRITE) && | |
1181 | (file->f_flags & O_TRUNC)) | |
ae63b31e | 1182 | ftrace_clear_events(tr); |
15075cac | 1183 | |
ae63b31e SR |
1184 | return ftrace_event_open(inode, file, seq_ops); |
1185 | } | |
1186 | ||
1187 | static struct event_subsystem * | |
1188 | create_new_subsystem(const char *name) | |
1189 | { | |
1190 | struct event_subsystem *system; | |
1191 | ||
1192 | /* need to create new entry */ | |
1193 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1194 | if (!system) | |
1195 | return NULL; | |
1196 | ||
1197 | system->ref_count = 1; | |
92edca07 | 1198 | system->name = name; |
ae63b31e SR |
1199 | |
1200 | system->filter = NULL; | |
1201 | ||
1202 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); | |
1203 | if (!system->filter) | |
1204 | goto out_free; | |
1205 | ||
1206 | list_add(&system->list, &event_subsystems); | |
1207 | ||
1208 | return system; | |
1209 | ||
1210 | out_free: | |
ae63b31e SR |
1211 | kfree(system); |
1212 | return NULL; | |
15075cac SR |
1213 | } |
1214 | ||
6ecc2d1c | 1215 | static struct dentry * |
ae63b31e SR |
1216 | event_subsystem_dir(struct trace_array *tr, const char *name, |
1217 | struct ftrace_event_file *file, struct dentry *parent) | |
6ecc2d1c | 1218 | { |
ae63b31e | 1219 | struct ftrace_subsystem_dir *dir; |
6ecc2d1c | 1220 | struct event_subsystem *system; |
e1112b4d | 1221 | struct dentry *entry; |
6ecc2d1c SR |
1222 | |
1223 | /* First see if we did not already create this dir */ | |
ae63b31e SR |
1224 | list_for_each_entry(dir, &tr->systems, list) { |
1225 | system = dir->subsystem; | |
dc82ec98 | 1226 | if (strcmp(system->name, name) == 0) { |
ae63b31e SR |
1227 | dir->nr_events++; |
1228 | file->system = dir; | |
1229 | return dir->entry; | |
dc82ec98 | 1230 | } |
6ecc2d1c SR |
1231 | } |
1232 | ||
ae63b31e SR |
1233 | /* Now see if the system itself exists. */ |
1234 | list_for_each_entry(system, &event_subsystems, list) { | |
1235 | if (strcmp(system->name, name) == 0) | |
1236 | break; | |
6ecc2d1c | 1237 | } |
ae63b31e SR |
1238 | /* Reset system variable when not found */ |
1239 | if (&system->list == &event_subsystems) | |
1240 | system = NULL; | |
6ecc2d1c | 1241 | |
ae63b31e SR |
1242 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
1243 | if (!dir) | |
1244 | goto out_fail; | |
6ecc2d1c | 1245 | |
ae63b31e SR |
1246 | if (!system) { |
1247 | system = create_new_subsystem(name); | |
1248 | if (!system) | |
1249 | goto out_free; | |
1250 | } else | |
1251 | __get_system(system); | |
1252 | ||
1253 | dir->entry = debugfs_create_dir(name, parent); | |
1254 | if (!dir->entry) { | |
1255 | pr_warning("Failed to create system directory %s\n", name); | |
1256 | __put_system(system); | |
1257 | goto out_free; | |
6d723736 SR |
1258 | } |
1259 | ||
ae63b31e SR |
1260 | dir->tr = tr; |
1261 | dir->ref_count = 1; | |
1262 | dir->nr_events = 1; | |
1263 | dir->subsystem = system; | |
1264 | file->system = dir; | |
8b372562 | 1265 | |
ae63b31e | 1266 | entry = debugfs_create_file("filter", 0644, dir->entry, dir, |
e1112b4d | 1267 | &ftrace_subsystem_filter_fops); |
8b372562 TZ |
1268 | if (!entry) { |
1269 | kfree(system->filter); | |
1270 | system->filter = NULL; | |
ae63b31e | 1271 | pr_warning("Could not create debugfs '%s/filter' entry\n", name); |
8b372562 | 1272 | } |
e1112b4d | 1273 | |
ae63b31e | 1274 | trace_create_file("enable", 0644, dir->entry, dir, |
f3f3f009 | 1275 | &ftrace_system_enable_fops); |
8ae79a13 | 1276 | |
ae63b31e SR |
1277 | list_add(&dir->list, &tr->systems); |
1278 | ||
1279 | return dir->entry; | |
1280 | ||
1281 | out_free: | |
1282 | kfree(dir); | |
1283 | out_fail: | |
1284 | /* Only print this message if failed on memory allocation */ | |
1285 | if (!dir || !system) | |
1286 | pr_warning("No memory to create event subsystem %s\n", | |
1287 | name); | |
1288 | return NULL; | |
6ecc2d1c SR |
1289 | } |
1290 | ||
1473e441 | 1291 | static int |
ae63b31e SR |
1292 | event_create_dir(struct dentry *parent, |
1293 | struct ftrace_event_file *file, | |
701970b3 SR |
1294 | const struct file_operations *id, |
1295 | const struct file_operations *enable, | |
1296 | const struct file_operations *filter, | |
1297 | const struct file_operations *format) | |
1473e441 | 1298 | { |
ae63b31e SR |
1299 | struct ftrace_event_call *call = file->event_call; |
1300 | struct trace_array *tr = file->tr; | |
2e33af02 | 1301 | struct list_head *head; |
ae63b31e | 1302 | struct dentry *d_events; |
fd994989 | 1303 | int ret; |
1473e441 | 1304 | |
6ecc2d1c SR |
1305 | /* |
1306 | * If the trace point header did not define TRACE_SYSTEM | |
1307 | * then the system would be called "TRACE_SYSTEM". | |
1308 | */ | |
ae63b31e SR |
1309 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { |
1310 | d_events = event_subsystem_dir(tr, call->class->system, file, parent); | |
1311 | if (!d_events) | |
1312 | return -ENOMEM; | |
1313 | } else | |
1314 | d_events = parent; | |
1315 | ||
1316 | file->dir = debugfs_create_dir(call->name, d_events); | |
1317 | if (!file->dir) { | |
1318 | pr_warning("Could not create debugfs '%s' directory\n", | |
1319 | call->name); | |
1473e441 SR |
1320 | return -1; |
1321 | } | |
1322 | ||
9b63776f | 1323 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
ae63b31e | 1324 | trace_create_file("enable", 0644, file->dir, file, |
f3f3f009 | 1325 | enable); |
1473e441 | 1326 | |
2239291a | 1327 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 1328 | if (call->event.type && call->class->reg) |
ae63b31e | 1329 | trace_create_file("id", 0444, file->dir, call, |
f3f3f009 | 1330 | id); |
2239291a | 1331 | #endif |
23725aee | 1332 | |
c9d932cf LZ |
1333 | /* |
1334 | * Other events may have the same class. Only update | |
1335 | * the fields if they are not already defined. | |
1336 | */ | |
1337 | head = trace_get_fields(call); | |
1338 | if (list_empty(head)) { | |
1339 | ret = call->class->define_fields(call); | |
1340 | if (ret < 0) { | |
1341 | pr_warning("Could not initialize trace point" | |
1342 | " events/%s\n", call->name); | |
ae63b31e | 1343 | return -1; |
cf027f64 TZ |
1344 | } |
1345 | } | |
ae63b31e | 1346 | trace_create_file("filter", 0644, file->dir, call, |
c9d932cf | 1347 | filter); |
cf027f64 | 1348 | |
ae63b31e | 1349 | trace_create_file("format", 0444, file->dir, call, |
f3f3f009 | 1350 | format); |
6d723736 SR |
1351 | |
1352 | return 0; | |
1353 | } | |
1354 | ||
ae63b31e SR |
1355 | static void remove_subsystem(struct ftrace_subsystem_dir *dir) |
1356 | { | |
1357 | if (!dir) | |
1358 | return; | |
1359 | ||
1360 | if (!--dir->nr_events) { | |
1361 | debugfs_remove_recursive(dir->entry); | |
1362 | list_del(&dir->list); | |
1363 | __put_system_dir(dir); | |
1364 | } | |
1365 | } | |
1366 | ||
1367 | static void remove_event_from_tracers(struct ftrace_event_call *call) | |
1368 | { | |
1369 | struct ftrace_event_file *file; | |
1370 | struct trace_array *tr; | |
1371 | ||
1372 | do_for_each_event_file_safe(tr, file) { | |
1373 | ||
1374 | if (file->event_call != call) | |
1375 | continue; | |
1376 | ||
1377 | list_del(&file->list); | |
1378 | debugfs_remove_recursive(file->dir); | |
1379 | remove_subsystem(file->system); | |
d1a29143 | 1380 | kmem_cache_free(file_cachep, file); |
ae63b31e SR |
1381 | |
1382 | /* | |
1383 | * The do_for_each_event_file_safe() is | |
1384 | * a double loop. After finding the call for this | |
1385 | * trace_array, we use break to jump to the next | |
1386 | * trace_array. | |
1387 | */ | |
1388 | break; | |
1389 | } while_for_each_event_file(); | |
1390 | } | |
1391 | ||
8781915a EG |
1392 | static void event_remove(struct ftrace_event_call *call) |
1393 | { | |
ae63b31e SR |
1394 | struct trace_array *tr; |
1395 | struct ftrace_event_file *file; | |
1396 | ||
1397 | do_for_each_event_file(tr, file) { | |
1398 | if (file->event_call != call) | |
1399 | continue; | |
1400 | ftrace_event_enable_disable(file, 0); | |
1401 | /* | |
1402 | * The do_for_each_event_file() is | |
1403 | * a double loop. After finding the call for this | |
1404 | * trace_array, we use break to jump to the next | |
1405 | * trace_array. | |
1406 | */ | |
1407 | break; | |
1408 | } while_for_each_event_file(); | |
1409 | ||
8781915a EG |
1410 | if (call->event.funcs) |
1411 | __unregister_ftrace_event(&call->event); | |
ae63b31e | 1412 | remove_event_from_tracers(call); |
8781915a EG |
1413 | list_del(&call->list); |
1414 | } | |
1415 | ||
1416 | static int event_init(struct ftrace_event_call *call) | |
1417 | { | |
1418 | int ret = 0; | |
1419 | ||
1420 | if (WARN_ON(!call->name)) | |
1421 | return -EINVAL; | |
1422 | ||
1423 | if (call->class->raw_init) { | |
1424 | ret = call->class->raw_init(call); | |
1425 | if (ret < 0 && ret != -ENOSYS) | |
1426 | pr_warn("Could not initialize trace events/%s\n", | |
1427 | call->name); | |
1428 | } | |
1429 | ||
1430 | return ret; | |
1431 | } | |
1432 | ||
67ead0a6 | 1433 | static int |
ae63b31e | 1434 | __register_event(struct ftrace_event_call *call, struct module *mod) |
bd1a5c84 | 1435 | { |
bd1a5c84 | 1436 | int ret; |
6d723736 | 1437 | |
8781915a EG |
1438 | ret = event_init(call); |
1439 | if (ret < 0) | |
1440 | return ret; | |
701970b3 | 1441 | |
ae63b31e | 1442 | list_add(&call->list, &ftrace_events); |
67ead0a6 | 1443 | call->mod = mod; |
88f70d75 | 1444 | |
ae63b31e | 1445 | return 0; |
bd1a5c84 MH |
1446 | } |
1447 | ||
ae63b31e SR |
1448 | /* Add an event to a trace directory */ |
1449 | static int | |
1450 | __trace_add_new_event(struct ftrace_event_call *call, | |
1451 | struct trace_array *tr, | |
1452 | const struct file_operations *id, | |
1453 | const struct file_operations *enable, | |
1454 | const struct file_operations *filter, | |
1455 | const struct file_operations *format) | |
1456 | { | |
1457 | struct ftrace_event_file *file; | |
1458 | ||
d1a29143 | 1459 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); |
ae63b31e SR |
1460 | if (!file) |
1461 | return -ENOMEM; | |
1462 | ||
1463 | file->event_call = call; | |
1464 | file->tr = tr; | |
1465 | list_add(&file->list, &tr->events); | |
1466 | ||
1467 | return event_create_dir(tr->event_dir, file, id, enable, filter, format); | |
1468 | } | |
1469 | ||
77248221 SR |
1470 | /* |
1471 | * Just create a decriptor for early init. A descriptor is required | |
1472 | * for enabling events at boot. We want to enable events before | |
1473 | * the filesystem is initialized. | |
1474 | */ | |
1475 | static __init int | |
1476 | __trace_early_add_new_event(struct ftrace_event_call *call, | |
1477 | struct trace_array *tr) | |
1478 | { | |
1479 | struct ftrace_event_file *file; | |
1480 | ||
d1a29143 | 1481 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); |
77248221 SR |
1482 | if (!file) |
1483 | return -ENOMEM; | |
1484 | ||
1485 | file->event_call = call; | |
1486 | file->tr = tr; | |
1487 | list_add(&file->list, &tr->events); | |
1488 | ||
1489 | return 0; | |
1490 | } | |
1491 | ||
ae63b31e SR |
1492 | struct ftrace_module_file_ops; |
1493 | static void __add_event_to_tracers(struct ftrace_event_call *call, | |
1494 | struct ftrace_module_file_ops *file_ops); | |
1495 | ||
bd1a5c84 MH |
1496 | /* Add an additional event_call dynamically */ |
1497 | int trace_add_event_call(struct ftrace_event_call *call) | |
1498 | { | |
1499 | int ret; | |
1500 | mutex_lock(&event_mutex); | |
701970b3 | 1501 | |
ae63b31e SR |
1502 | ret = __register_event(call, NULL); |
1503 | if (ret >= 0) | |
1504 | __add_event_to_tracers(call, NULL); | |
a2ca5e03 | 1505 | |
ae63b31e SR |
1506 | mutex_unlock(&event_mutex); |
1507 | return ret; | |
a2ca5e03 FW |
1508 | } |
1509 | ||
4fead8e4 MH |
1510 | /* |
1511 | * Must be called under locking both of event_mutex and trace_event_mutex. | |
1512 | */ | |
bd1a5c84 MH |
1513 | static void __trace_remove_event_call(struct ftrace_event_call *call) |
1514 | { | |
8781915a | 1515 | event_remove(call); |
bd1a5c84 MH |
1516 | trace_destroy_fields(call); |
1517 | destroy_preds(call); | |
bd1a5c84 MH |
1518 | } |
1519 | ||
1520 | /* Remove an event_call */ | |
1521 | void trace_remove_event_call(struct ftrace_event_call *call) | |
1522 | { | |
1523 | mutex_lock(&event_mutex); | |
4fead8e4 | 1524 | down_write(&trace_event_mutex); |
bd1a5c84 | 1525 | __trace_remove_event_call(call); |
4fead8e4 | 1526 | up_write(&trace_event_mutex); |
bd1a5c84 MH |
1527 | mutex_unlock(&event_mutex); |
1528 | } | |
1529 | ||
1530 | #define for_each_event(event, start, end) \ | |
1531 | for (event = start; \ | |
1532 | (unsigned long)event < (unsigned long)end; \ | |
1533 | event++) | |
1534 | ||
1535 | #ifdef CONFIG_MODULES | |
1536 | ||
1537 | static LIST_HEAD(ftrace_module_file_list); | |
1538 | ||
1539 | /* | |
1540 | * Modules must own their file_operations to keep up with | |
1541 | * reference counting. | |
1542 | */ | |
1543 | struct ftrace_module_file_ops { | |
1544 | struct list_head list; | |
1545 | struct module *mod; | |
1546 | struct file_operations id; | |
1547 | struct file_operations enable; | |
1548 | struct file_operations format; | |
1549 | struct file_operations filter; | |
1550 | }; | |
1551 | ||
315326c1 SRRH |
1552 | static struct ftrace_module_file_ops * |
1553 | find_ftrace_file_ops(struct ftrace_module_file_ops *file_ops, struct module *mod) | |
ae63b31e | 1554 | { |
315326c1 SRRH |
1555 | /* |
1556 | * As event_calls are added in groups by module, | |
1557 | * when we find one file_ops, we don't need to search for | |
1558 | * each call in that module, as the rest should be the | |
1559 | * same. Only search for a new one if the last one did | |
1560 | * not match. | |
1561 | */ | |
1562 | if (file_ops && mod == file_ops->mod) | |
1563 | return file_ops; | |
ae63b31e SR |
1564 | |
1565 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1566 | if (file_ops->mod == mod) | |
1567 | return file_ops; | |
1568 | } | |
1569 | return NULL; | |
1570 | } | |
1571 | ||
701970b3 SR |
1572 | static struct ftrace_module_file_ops * |
1573 | trace_create_file_ops(struct module *mod) | |
1574 | { | |
1575 | struct ftrace_module_file_ops *file_ops; | |
1576 | ||
1577 | /* | |
1578 | * This is a bit of a PITA. To allow for correct reference | |
1579 | * counting, modules must "own" their file_operations. | |
1580 | * To do this, we allocate the file operations that will be | |
1581 | * used in the event directory. | |
1582 | */ | |
1583 | ||
1584 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1585 | if (!file_ops) | |
1586 | return NULL; | |
1587 | ||
1588 | file_ops->mod = mod; | |
1589 | ||
1590 | file_ops->id = ftrace_event_id_fops; | |
1591 | file_ops->id.owner = mod; | |
1592 | ||
1593 | file_ops->enable = ftrace_enable_fops; | |
1594 | file_ops->enable.owner = mod; | |
1595 | ||
1596 | file_ops->filter = ftrace_event_filter_fops; | |
1597 | file_ops->filter.owner = mod; | |
1598 | ||
1599 | file_ops->format = ftrace_event_format_fops; | |
1600 | file_ops->format.owner = mod; | |
1601 | ||
1602 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1603 | ||
1604 | return file_ops; | |
1605 | } | |
1606 | ||
6d723736 SR |
1607 | static void trace_module_add_events(struct module *mod) |
1608 | { | |
701970b3 | 1609 | struct ftrace_module_file_ops *file_ops = NULL; |
e4a9ea5e | 1610 | struct ftrace_event_call **call, **start, **end; |
6d723736 SR |
1611 | |
1612 | start = mod->trace_events; | |
1613 | end = mod->trace_events + mod->num_trace_events; | |
1614 | ||
1615 | if (start == end) | |
1616 | return; | |
1617 | ||
67ead0a6 LZ |
1618 | file_ops = trace_create_file_ops(mod); |
1619 | if (!file_ops) | |
6d723736 SR |
1620 | return; |
1621 | ||
1622 | for_each_event(call, start, end) { | |
ae63b31e SR |
1623 | __register_event(*call, mod); |
1624 | __add_event_to_tracers(*call, file_ops); | |
6d723736 SR |
1625 | } |
1626 | } | |
1627 | ||
1628 | static void trace_module_remove_events(struct module *mod) | |
1629 | { | |
701970b3 | 1630 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1631 | struct ftrace_event_call *call, *p; |
575380da | 1632 | bool clear_trace = false; |
6d723736 | 1633 | |
110bf2b7 | 1634 | down_write(&trace_event_mutex); |
6d723736 SR |
1635 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1636 | if (call->mod == mod) { | |
575380da SRRH |
1637 | if (call->flags & TRACE_EVENT_FL_WAS_ENABLED) |
1638 | clear_trace = true; | |
bd1a5c84 | 1639 | __trace_remove_event_call(call); |
6d723736 SR |
1640 | } |
1641 | } | |
701970b3 SR |
1642 | |
1643 | /* Now free the file_operations */ | |
1644 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1645 | if (file_ops->mod == mod) | |
1646 | break; | |
1647 | } | |
1648 | if (&file_ops->list != &ftrace_module_file_list) { | |
1649 | list_del(&file_ops->list); | |
1650 | kfree(file_ops); | |
1651 | } | |
873c642f | 1652 | up_write(&trace_event_mutex); |
9456f0fa SR |
1653 | |
1654 | /* | |
1655 | * It is safest to reset the ring buffer if the module being unloaded | |
873c642f SRRH |
1656 | * registered any events that were used. The only worry is if |
1657 | * a new module gets loaded, and takes on the same id as the events | |
1658 | * of this module. When printing out the buffer, traced events left | |
1659 | * over from this module may be passed to the new module events and | |
1660 | * unexpected results may occur. | |
9456f0fa | 1661 | */ |
575380da | 1662 | if (clear_trace) |
873c642f | 1663 | tracing_reset_all_online_cpus(); |
6d723736 SR |
1664 | } |
1665 | ||
61f919a1 SR |
1666 | static int trace_module_notify(struct notifier_block *self, |
1667 | unsigned long val, void *data) | |
6d723736 SR |
1668 | { |
1669 | struct module *mod = data; | |
1670 | ||
1671 | mutex_lock(&event_mutex); | |
1672 | switch (val) { | |
1673 | case MODULE_STATE_COMING: | |
1674 | trace_module_add_events(mod); | |
1675 | break; | |
1676 | case MODULE_STATE_GOING: | |
1677 | trace_module_remove_events(mod); | |
1678 | break; | |
1679 | } | |
1680 | mutex_unlock(&event_mutex); | |
fd994989 | 1681 | |
1473e441 SR |
1682 | return 0; |
1683 | } | |
315326c1 SRRH |
1684 | |
1685 | static int | |
1686 | __trace_add_new_mod_event(struct ftrace_event_call *call, | |
1687 | struct trace_array *tr, | |
1688 | struct ftrace_module_file_ops *file_ops) | |
1689 | { | |
1690 | return __trace_add_new_event(call, tr, | |
1691 | &file_ops->id, &file_ops->enable, | |
1692 | &file_ops->filter, &file_ops->format); | |
1693 | } | |
1694 | ||
61f919a1 | 1695 | #else |
315326c1 SRRH |
1696 | static inline struct ftrace_module_file_ops * |
1697 | find_ftrace_file_ops(struct ftrace_module_file_ops *file_ops, struct module *mod) | |
ae63b31e SR |
1698 | { |
1699 | return NULL; | |
1700 | } | |
315326c1 SRRH |
1701 | static inline int trace_module_notify(struct notifier_block *self, |
1702 | unsigned long val, void *data) | |
61f919a1 SR |
1703 | { |
1704 | return 0; | |
1705 | } | |
315326c1 SRRH |
1706 | static inline int |
1707 | __trace_add_new_mod_event(struct ftrace_event_call *call, | |
1708 | struct trace_array *tr, | |
1709 | struct ftrace_module_file_ops *file_ops) | |
1710 | { | |
1711 | return -ENODEV; | |
1712 | } | |
61f919a1 | 1713 | #endif /* CONFIG_MODULES */ |
1473e441 | 1714 | |
ae63b31e SR |
1715 | /* Create a new event directory structure for a trace directory. */ |
1716 | static void | |
1717 | __trace_add_event_dirs(struct trace_array *tr) | |
1718 | { | |
1719 | struct ftrace_module_file_ops *file_ops = NULL; | |
1720 | struct ftrace_event_call *call; | |
1721 | int ret; | |
1722 | ||
1723 | list_for_each_entry(call, &ftrace_events, list) { | |
1724 | if (call->mod) { | |
1725 | /* | |
1726 | * Directories for events by modules need to | |
1727 | * keep module ref counts when opened (as we don't | |
1728 | * want the module to disappear when reading one | |
1729 | * of these files). The file_ops keep account of | |
1730 | * the module ref count. | |
ae63b31e | 1731 | */ |
315326c1 | 1732 | file_ops = find_ftrace_file_ops(file_ops, call->mod); |
ae63b31e SR |
1733 | if (!file_ops) |
1734 | continue; /* Warn? */ | |
315326c1 | 1735 | ret = __trace_add_new_mod_event(call, tr, file_ops); |
ae63b31e SR |
1736 | if (ret < 0) |
1737 | pr_warning("Could not create directory for event %s\n", | |
1738 | call->name); | |
1739 | continue; | |
1740 | } | |
1741 | ret = __trace_add_new_event(call, tr, | |
1742 | &ftrace_event_id_fops, | |
1743 | &ftrace_enable_fops, | |
1744 | &ftrace_event_filter_fops, | |
1745 | &ftrace_event_format_fops); | |
1746 | if (ret < 0) | |
1747 | pr_warning("Could not create directory for event %s\n", | |
1748 | call->name); | |
1749 | } | |
1750 | } | |
1751 | ||
77248221 SR |
1752 | /* |
1753 | * The top level array has already had its ftrace_event_file | |
1754 | * descriptors created in order to allow for early events to | |
1755 | * be recorded. This function is called after the debugfs has been | |
1756 | * initialized, and we now have to create the files associated | |
1757 | * to the events. | |
1758 | */ | |
1759 | static __init void | |
1760 | __trace_early_add_event_dirs(struct trace_array *tr) | |
1761 | { | |
1762 | struct ftrace_event_file *file; | |
1763 | int ret; | |
1764 | ||
1765 | ||
1766 | list_for_each_entry(file, &tr->events, list) { | |
1767 | ret = event_create_dir(tr->event_dir, file, | |
1768 | &ftrace_event_id_fops, | |
1769 | &ftrace_enable_fops, | |
1770 | &ftrace_event_filter_fops, | |
1771 | &ftrace_event_format_fops); | |
1772 | if (ret < 0) | |
1773 | pr_warning("Could not create directory for event %s\n", | |
1774 | file->event_call->name); | |
1775 | } | |
1776 | } | |
1777 | ||
1778 | /* | |
1779 | * For early boot up, the top trace array requires to have | |
1780 | * a list of events that can be enabled. This must be done before | |
1781 | * the filesystem is set up in order to allow events to be traced | |
1782 | * early. | |
1783 | */ | |
1784 | static __init void | |
1785 | __trace_early_add_events(struct trace_array *tr) | |
1786 | { | |
1787 | struct ftrace_event_call *call; | |
1788 | int ret; | |
1789 | ||
1790 | list_for_each_entry(call, &ftrace_events, list) { | |
1791 | /* Early boot up should not have any modules loaded */ | |
1792 | if (WARN_ON_ONCE(call->mod)) | |
1793 | continue; | |
1794 | ||
1795 | ret = __trace_early_add_new_event(call, tr); | |
1796 | if (ret < 0) | |
1797 | pr_warning("Could not create early event %s\n", | |
1798 | call->name); | |
1799 | } | |
1800 | } | |
1801 | ||
0c8916c3 SR |
1802 | /* Remove the event directory structure for a trace directory. */ |
1803 | static void | |
1804 | __trace_remove_event_dirs(struct trace_array *tr) | |
1805 | { | |
1806 | struct ftrace_event_file *file, *next; | |
1807 | ||
1808 | list_for_each_entry_safe(file, next, &tr->events, list) { | |
1809 | list_del(&file->list); | |
1810 | debugfs_remove_recursive(file->dir); | |
1811 | remove_subsystem(file->system); | |
d1a29143 | 1812 | kmem_cache_free(file_cachep, file); |
0c8916c3 SR |
1813 | } |
1814 | } | |
1815 | ||
ae63b31e SR |
1816 | static void |
1817 | __add_event_to_tracers(struct ftrace_event_call *call, | |
1818 | struct ftrace_module_file_ops *file_ops) | |
1819 | { | |
1820 | struct trace_array *tr; | |
1821 | ||
1822 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
1823 | if (file_ops) | |
315326c1 | 1824 | __trace_add_new_mod_event(call, tr, file_ops); |
ae63b31e SR |
1825 | else |
1826 | __trace_add_new_event(call, tr, | |
1827 | &ftrace_event_id_fops, | |
1828 | &ftrace_enable_fops, | |
1829 | &ftrace_event_filter_fops, | |
1830 | &ftrace_event_format_fops); | |
1831 | } | |
1832 | } | |
1833 | ||
ec827c7e | 1834 | static struct notifier_block trace_module_nb = { |
6d723736 SR |
1835 | .notifier_call = trace_module_notify, |
1836 | .priority = 0, | |
1837 | }; | |
1838 | ||
e4a9ea5e SR |
1839 | extern struct ftrace_event_call *__start_ftrace_events[]; |
1840 | extern struct ftrace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 1841 | |
020e5f85 LZ |
1842 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
1843 | ||
1844 | static __init int setup_trace_event(char *str) | |
1845 | { | |
1846 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
55034cd6 SRRH |
1847 | ring_buffer_expanded = true; |
1848 | tracing_selftest_disabled = true; | |
020e5f85 LZ |
1849 | |
1850 | return 1; | |
1851 | } | |
1852 | __setup("trace_event=", setup_trace_event); | |
1853 | ||
77248221 SR |
1854 | /* Expects to have event_mutex held when called */ |
1855 | static int | |
1856 | create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) | |
ae63b31e SR |
1857 | { |
1858 | struct dentry *d_events; | |
1859 | struct dentry *entry; | |
1860 | ||
1861 | entry = debugfs_create_file("set_event", 0644, parent, | |
1862 | tr, &ftrace_set_event_fops); | |
1863 | if (!entry) { | |
1864 | pr_warning("Could not create debugfs 'set_event' entry\n"); | |
1865 | return -ENOMEM; | |
1866 | } | |
1867 | ||
1868 | d_events = debugfs_create_dir("events", parent); | |
277ba044 | 1869 | if (!d_events) { |
ae63b31e | 1870 | pr_warning("Could not create debugfs 'events' directory\n"); |
277ba044 SR |
1871 | return -ENOMEM; |
1872 | } | |
ae63b31e SR |
1873 | |
1874 | /* ring buffer internal formats */ | |
1875 | trace_create_file("header_page", 0444, d_events, | |
1876 | ring_buffer_print_page_header, | |
1877 | &ftrace_show_header_fops); | |
1878 | ||
1879 | trace_create_file("header_event", 0444, d_events, | |
1880 | ring_buffer_print_entry_header, | |
1881 | &ftrace_show_header_fops); | |
1882 | ||
1883 | trace_create_file("enable", 0644, d_events, | |
1884 | tr, &ftrace_tr_enable_fops); | |
1885 | ||
1886 | tr->event_dir = d_events; | |
77248221 SR |
1887 | |
1888 | return 0; | |
1889 | } | |
1890 | ||
1891 | /** | |
1892 | * event_trace_add_tracer - add a instance of a trace_array to events | |
1893 | * @parent: The parent dentry to place the files/directories for events in | |
1894 | * @tr: The trace array associated with these events | |
1895 | * | |
1896 | * When a new instance is created, it needs to set up its events | |
1897 | * directory, as well as other files associated with events. It also | |
1898 | * creates the event hierachry in the @parent/events directory. | |
1899 | * | |
1900 | * Returns 0 on success. | |
1901 | */ | |
1902 | int event_trace_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 | ||
277ba044 | 1912 | down_write(&trace_event_mutex); |
ae63b31e | 1913 | __trace_add_event_dirs(tr); |
277ba044 SR |
1914 | up_write(&trace_event_mutex); |
1915 | ||
77248221 | 1916 | out_unlock: |
277ba044 | 1917 | mutex_unlock(&event_mutex); |
ae63b31e | 1918 | |
77248221 SR |
1919 | return ret; |
1920 | } | |
1921 | ||
1922 | /* | |
1923 | * The top trace array already had its file descriptors created. | |
1924 | * Now the files themselves need to be created. | |
1925 | */ | |
1926 | static __init int | |
1927 | early_event_add_tracer(struct dentry *parent, struct trace_array *tr) | |
1928 | { | |
1929 | int ret; | |
1930 | ||
1931 | mutex_lock(&event_mutex); | |
1932 | ||
1933 | ret = create_event_toplevel_files(parent, tr); | |
1934 | if (ret) | |
1935 | goto out_unlock; | |
1936 | ||
1937 | down_write(&trace_event_mutex); | |
1938 | __trace_early_add_event_dirs(tr); | |
1939 | up_write(&trace_event_mutex); | |
1940 | ||
1941 | out_unlock: | |
1942 | mutex_unlock(&event_mutex); | |
1943 | ||
1944 | return ret; | |
ae63b31e SR |
1945 | } |
1946 | ||
0c8916c3 SR |
1947 | int event_trace_del_tracer(struct trace_array *tr) |
1948 | { | |
1949 | /* Disable any running events */ | |
1950 | __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); | |
1951 | ||
1952 | mutex_lock(&event_mutex); | |
1953 | ||
1954 | down_write(&trace_event_mutex); | |
1955 | __trace_remove_event_dirs(tr); | |
1956 | debugfs_remove_recursive(tr->event_dir); | |
1957 | up_write(&trace_event_mutex); | |
1958 | ||
1959 | tr->event_dir = NULL; | |
1960 | ||
1961 | mutex_unlock(&event_mutex); | |
1962 | ||
1963 | return 0; | |
1964 | } | |
1965 | ||
d1a29143 SR |
1966 | static __init int event_trace_memsetup(void) |
1967 | { | |
1968 | field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); | |
1969 | file_cachep = KMEM_CACHE(ftrace_event_file, SLAB_PANIC); | |
1970 | return 0; | |
1971 | } | |
1972 | ||
8781915a EG |
1973 | static __init int event_trace_enable(void) |
1974 | { | |
ae63b31e | 1975 | struct trace_array *tr = top_trace_array(); |
8781915a EG |
1976 | struct ftrace_event_call **iter, *call; |
1977 | char *buf = bootup_event_buf; | |
1978 | char *token; | |
1979 | int ret; | |
1980 | ||
1981 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { | |
1982 | ||
1983 | call = *iter; | |
1984 | ret = event_init(call); | |
1985 | if (!ret) | |
1986 | list_add(&call->list, &ftrace_events); | |
1987 | } | |
1988 | ||
77248221 SR |
1989 | /* |
1990 | * We need the top trace array to have a working set of trace | |
1991 | * points at early init, before the debug files and directories | |
1992 | * are created. Create the file entries now, and attach them | |
1993 | * to the actual file dentries later. | |
1994 | */ | |
1995 | __trace_early_add_events(tr); | |
1996 | ||
8781915a EG |
1997 | while (true) { |
1998 | token = strsep(&buf, ","); | |
1999 | ||
2000 | if (!token) | |
2001 | break; | |
2002 | if (!*token) | |
2003 | continue; | |
2004 | ||
ae63b31e | 2005 | ret = ftrace_set_clr_event(tr, token, 1); |
8781915a EG |
2006 | if (ret) |
2007 | pr_warn("Failed to enable trace event: %s\n", token); | |
2008 | } | |
81698831 SR |
2009 | |
2010 | trace_printk_start_comm(); | |
2011 | ||
8781915a EG |
2012 | return 0; |
2013 | } | |
2014 | ||
b77e38aa SR |
2015 | static __init int event_trace_init(void) |
2016 | { | |
ae63b31e | 2017 | struct trace_array *tr; |
b77e38aa SR |
2018 | struct dentry *d_tracer; |
2019 | struct dentry *entry; | |
6d723736 | 2020 | int ret; |
b77e38aa | 2021 | |
ae63b31e SR |
2022 | tr = top_trace_array(); |
2023 | ||
b77e38aa SR |
2024 | d_tracer = tracing_init_dentry(); |
2025 | if (!d_tracer) | |
2026 | return 0; | |
2027 | ||
2314c4ae | 2028 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
ae63b31e | 2029 | tr, &ftrace_avail_fops); |
2314c4ae SR |
2030 | if (!entry) |
2031 | pr_warning("Could not create debugfs " | |
2032 | "'available_events' entry\n"); | |
2033 | ||
8728fe50 LZ |
2034 | if (trace_define_common_fields()) |
2035 | pr_warning("tracing: Failed to allocate common fields"); | |
2036 | ||
77248221 | 2037 | ret = early_event_add_tracer(d_tracer, tr); |
ae63b31e SR |
2038 | if (ret) |
2039 | return ret; | |
020e5f85 | 2040 | |
6d723736 | 2041 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 2042 | if (ret) |
6d723736 SR |
2043 | pr_warning("Failed to register trace events module notifier\n"); |
2044 | ||
b77e38aa SR |
2045 | return 0; |
2046 | } | |
d1a29143 | 2047 | early_initcall(event_trace_memsetup); |
8781915a | 2048 | core_initcall(event_trace_enable); |
b77e38aa | 2049 | fs_initcall(event_trace_init); |
e6187007 SR |
2050 | |
2051 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
2052 | ||
2053 | static DEFINE_SPINLOCK(test_spinlock); | |
2054 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
2055 | static DEFINE_MUTEX(test_mutex); | |
2056 | ||
2057 | static __init void test_work(struct work_struct *dummy) | |
2058 | { | |
2059 | spin_lock(&test_spinlock); | |
2060 | spin_lock_irq(&test_spinlock_irq); | |
2061 | udelay(1); | |
2062 | spin_unlock_irq(&test_spinlock_irq); | |
2063 | spin_unlock(&test_spinlock); | |
2064 | ||
2065 | mutex_lock(&test_mutex); | |
2066 | msleep(1); | |
2067 | mutex_unlock(&test_mutex); | |
2068 | } | |
2069 | ||
2070 | static __init int event_test_thread(void *unused) | |
2071 | { | |
2072 | void *test_malloc; | |
2073 | ||
2074 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
2075 | if (!test_malloc) | |
2076 | pr_info("failed to kmalloc\n"); | |
2077 | ||
2078 | schedule_on_each_cpu(test_work); | |
2079 | ||
2080 | kfree(test_malloc); | |
2081 | ||
2082 | set_current_state(TASK_INTERRUPTIBLE); | |
2083 | while (!kthread_should_stop()) | |
2084 | schedule(); | |
2085 | ||
2086 | return 0; | |
2087 | } | |
2088 | ||
2089 | /* | |
2090 | * Do various things that may trigger events. | |
2091 | */ | |
2092 | static __init void event_test_stuff(void) | |
2093 | { | |
2094 | struct task_struct *test_thread; | |
2095 | ||
2096 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
2097 | msleep(1); | |
2098 | kthread_stop(test_thread); | |
2099 | } | |
2100 | ||
2101 | /* | |
2102 | * For every trace event defined, we will test each trace point separately, | |
2103 | * and then by groups, and finally all trace points. | |
2104 | */ | |
9ea21c1e | 2105 | static __init void event_trace_self_tests(void) |
e6187007 | 2106 | { |
ae63b31e SR |
2107 | struct ftrace_subsystem_dir *dir; |
2108 | struct ftrace_event_file *file; | |
e6187007 SR |
2109 | struct ftrace_event_call *call; |
2110 | struct event_subsystem *system; | |
ae63b31e | 2111 | struct trace_array *tr; |
e6187007 SR |
2112 | int ret; |
2113 | ||
ae63b31e SR |
2114 | tr = top_trace_array(); |
2115 | ||
e6187007 SR |
2116 | pr_info("Running tests on trace events:\n"); |
2117 | ||
ae63b31e SR |
2118 | list_for_each_entry(file, &tr->events, list) { |
2119 | ||
2120 | call = file->event_call; | |
e6187007 | 2121 | |
2239291a SR |
2122 | /* Only test those that have a probe */ |
2123 | if (!call->class || !call->class->probe) | |
e6187007 SR |
2124 | continue; |
2125 | ||
1f5a6b45 SR |
2126 | /* |
2127 | * Testing syscall events here is pretty useless, but | |
2128 | * we still do it if configured. But this is time consuming. | |
2129 | * What we really need is a user thread to perform the | |
2130 | * syscalls as we test. | |
2131 | */ | |
2132 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
2133 | if (call->class->system && |
2134 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
2135 | continue; |
2136 | #endif | |
2137 | ||
e6187007 SR |
2138 | pr_info("Testing event %s: ", call->name); |
2139 | ||
2140 | /* | |
2141 | * If an event is already enabled, someone is using | |
2142 | * it and the self test should not be on. | |
2143 | */ | |
ae63b31e | 2144 | if (file->flags & FTRACE_EVENT_FL_ENABLED) { |
e6187007 SR |
2145 | pr_warning("Enabled event during self test!\n"); |
2146 | WARN_ON_ONCE(1); | |
2147 | continue; | |
2148 | } | |
2149 | ||
ae63b31e | 2150 | ftrace_event_enable_disable(file, 1); |
e6187007 | 2151 | event_test_stuff(); |
ae63b31e | 2152 | ftrace_event_enable_disable(file, 0); |
e6187007 SR |
2153 | |
2154 | pr_cont("OK\n"); | |
2155 | } | |
2156 | ||
2157 | /* Now test at the sub system level */ | |
2158 | ||
2159 | pr_info("Running tests on trace event systems:\n"); | |
2160 | ||
ae63b31e SR |
2161 | list_for_each_entry(dir, &tr->systems, list) { |
2162 | ||
2163 | system = dir->subsystem; | |
e6187007 SR |
2164 | |
2165 | /* the ftrace system is special, skip it */ | |
2166 | if (strcmp(system->name, "ftrace") == 0) | |
2167 | continue; | |
2168 | ||
2169 | pr_info("Testing event system %s: ", system->name); | |
2170 | ||
ae63b31e | 2171 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
e6187007 SR |
2172 | if (WARN_ON_ONCE(ret)) { |
2173 | pr_warning("error enabling system %s\n", | |
2174 | system->name); | |
2175 | continue; | |
2176 | } | |
2177 | ||
2178 | event_test_stuff(); | |
2179 | ||
ae63b31e | 2180 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
76bab1b7 | 2181 | if (WARN_ON_ONCE(ret)) { |
e6187007 SR |
2182 | pr_warning("error disabling system %s\n", |
2183 | system->name); | |
76bab1b7 YL |
2184 | continue; |
2185 | } | |
e6187007 SR |
2186 | |
2187 | pr_cont("OK\n"); | |
2188 | } | |
2189 | ||
2190 | /* Test with all events enabled */ | |
2191 | ||
2192 | pr_info("Running tests on all trace events:\n"); | |
2193 | pr_info("Testing all events: "); | |
2194 | ||
ae63b31e | 2195 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
e6187007 | 2196 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 2197 | pr_warning("error enabling all events\n"); |
9ea21c1e | 2198 | return; |
e6187007 SR |
2199 | } |
2200 | ||
2201 | event_test_stuff(); | |
2202 | ||
2203 | /* reset sysname */ | |
ae63b31e | 2204 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
e6187007 SR |
2205 | if (WARN_ON_ONCE(ret)) { |
2206 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 2207 | return; |
e6187007 SR |
2208 | } |
2209 | ||
2210 | pr_cont("OK\n"); | |
9ea21c1e SR |
2211 | } |
2212 | ||
2213 | #ifdef CONFIG_FUNCTION_TRACER | |
2214 | ||
245b2e70 | 2215 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e SR |
2216 | |
2217 | static void | |
2f5f6ad9 | 2218 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 2219 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
9ea21c1e SR |
2220 | { |
2221 | struct ring_buffer_event *event; | |
e77405ad | 2222 | struct ring_buffer *buffer; |
9ea21c1e SR |
2223 | struct ftrace_entry *entry; |
2224 | unsigned long flags; | |
2225 | long disabled; | |
9ea21c1e SR |
2226 | int cpu; |
2227 | int pc; | |
2228 | ||
2229 | pc = preempt_count(); | |
5168ae50 | 2230 | preempt_disable_notrace(); |
9ea21c1e | 2231 | cpu = raw_smp_processor_id(); |
245b2e70 | 2232 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
2233 | |
2234 | if (disabled != 1) | |
2235 | goto out; | |
2236 | ||
2237 | local_save_flags(flags); | |
2238 | ||
e77405ad SR |
2239 | event = trace_current_buffer_lock_reserve(&buffer, |
2240 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
2241 | flags, pc); |
2242 | if (!event) | |
2243 | goto out; | |
2244 | entry = ring_buffer_event_data(event); | |
2245 | entry->ip = ip; | |
2246 | entry->parent_ip = parent_ip; | |
2247 | ||
0d5c6e1c | 2248 | trace_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
2249 | |
2250 | out: | |
245b2e70 | 2251 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 2252 | preempt_enable_notrace(); |
9ea21c1e SR |
2253 | } |
2254 | ||
2255 | static struct ftrace_ops trace_ops __initdata = | |
2256 | { | |
2257 | .func = function_test_events_call, | |
4740974a | 2258 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
9ea21c1e SR |
2259 | }; |
2260 | ||
2261 | static __init void event_trace_self_test_with_function(void) | |
2262 | { | |
17bb615a SR |
2263 | int ret; |
2264 | ret = register_ftrace_function(&trace_ops); | |
2265 | if (WARN_ON(ret < 0)) { | |
2266 | pr_info("Failed to enable function tracer for event tests\n"); | |
2267 | return; | |
2268 | } | |
9ea21c1e SR |
2269 | pr_info("Running tests again, along with the function tracer\n"); |
2270 | event_trace_self_tests(); | |
2271 | unregister_ftrace_function(&trace_ops); | |
2272 | } | |
2273 | #else | |
2274 | static __init void event_trace_self_test_with_function(void) | |
2275 | { | |
2276 | } | |
2277 | #endif | |
2278 | ||
2279 | static __init int event_trace_self_tests_init(void) | |
2280 | { | |
020e5f85 LZ |
2281 | if (!tracing_selftest_disabled) { |
2282 | event_trace_self_tests(); | |
2283 | event_trace_self_test_with_function(); | |
2284 | } | |
e6187007 SR |
2285 | |
2286 | return 0; | |
2287 | } | |
2288 | ||
28d20e2d | 2289 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
2290 | |
2291 | #endif |