Commit | Line | Data |
---|---|---|
b77e38aa SR |
1 | /* |
2 | * event tracer | |
3 | * | |
4 | * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> | |
5 | * | |
981d081e SR |
6 | * - Added format output of fields of the trace point. |
7 | * This was based off of work by Tom Zanussi <tzanussi@gmail.com>. | |
8 | * | |
b77e38aa SR |
9 | */ |
10 | ||
e6187007 SR |
11 | #include <linux/workqueue.h> |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/kthread.h> | |
b77e38aa SR |
14 | #include <linux/debugfs.h> |
15 | #include <linux/uaccess.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/ctype.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
e6187007 | 19 | #include <linux/delay.h> |
b77e38aa | 20 | |
020e5f85 LZ |
21 | #include <asm/setup.h> |
22 | ||
91729ef9 | 23 | #include "trace_output.h" |
b77e38aa | 24 | |
4e5292ea | 25 | #undef TRACE_SYSTEM |
b628b3e6 SR |
26 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
27 | ||
20c8928a | 28 | DEFINE_MUTEX(event_mutex); |
11a241a3 | 29 | |
04295780 SR |
30 | DEFINE_MUTEX(event_storage_mutex); |
31 | EXPORT_SYMBOL_GPL(event_storage_mutex); | |
32 | ||
33 | char event_storage[EVENT_STORAGE_SIZE]; | |
34 | EXPORT_SYMBOL_GPL(event_storage); | |
35 | ||
a59fd602 | 36 | LIST_HEAD(ftrace_events); |
8728fe50 | 37 | LIST_HEAD(ftrace_common_fields); |
a59fd602 | 38 | |
2e33af02 SR |
39 | struct list_head * |
40 | trace_get_fields(struct ftrace_event_call *event_call) | |
41 | { | |
42 | if (!event_call->class->get_fields) | |
43 | return &event_call->class->fields; | |
44 | return event_call->class->get_fields(event_call); | |
45 | } | |
46 | ||
8728fe50 LZ |
47 | static int __trace_define_field(struct list_head *head, const char *type, |
48 | const char *name, int offset, int size, | |
49 | int is_signed, int filter_type) | |
cf027f64 TZ |
50 | { |
51 | struct ftrace_event_field *field; | |
52 | ||
fe9f57f2 | 53 | field = kzalloc(sizeof(*field), GFP_KERNEL); |
cf027f64 TZ |
54 | if (!field) |
55 | goto err; | |
fe9f57f2 | 56 | |
cf027f64 TZ |
57 | field->name = kstrdup(name, GFP_KERNEL); |
58 | if (!field->name) | |
59 | goto err; | |
fe9f57f2 | 60 | |
cf027f64 TZ |
61 | field->type = kstrdup(type, GFP_KERNEL); |
62 | if (!field->type) | |
63 | goto err; | |
fe9f57f2 | 64 | |
43b51ead LZ |
65 | if (filter_type == FILTER_OTHER) |
66 | field->filter_type = filter_assign_type(type); | |
67 | else | |
68 | field->filter_type = filter_type; | |
69 | ||
cf027f64 TZ |
70 | field->offset = offset; |
71 | field->size = size; | |
a118e4d1 | 72 | field->is_signed = is_signed; |
aa38e9fc | 73 | |
2e33af02 | 74 | list_add(&field->link, head); |
cf027f64 TZ |
75 | |
76 | return 0; | |
fe9f57f2 | 77 | |
cf027f64 | 78 | err: |
7b60997f | 79 | if (field) |
cf027f64 | 80 | kfree(field->name); |
cf027f64 | 81 | kfree(field); |
fe9f57f2 | 82 | |
cf027f64 TZ |
83 | return -ENOMEM; |
84 | } | |
8728fe50 LZ |
85 | |
86 | int trace_define_field(struct ftrace_event_call *call, const char *type, | |
87 | const char *name, int offset, int size, int is_signed, | |
88 | int filter_type) | |
89 | { | |
90 | struct list_head *head; | |
91 | ||
92 | if (WARN_ON(!call->class)) | |
93 | return 0; | |
94 | ||
95 | head = trace_get_fields(call); | |
96 | return __trace_define_field(head, type, name, offset, size, | |
97 | is_signed, filter_type); | |
98 | } | |
17c873ec | 99 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 100 | |
e647d6b3 | 101 | #define __common_field(type, item) \ |
8728fe50 LZ |
102 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
103 | "common_" #item, \ | |
104 | offsetof(typeof(ent), item), \ | |
105 | sizeof(ent.item), \ | |
106 | is_signed_type(type), FILTER_OTHER); \ | |
e647d6b3 LZ |
107 | if (ret) \ |
108 | return ret; | |
109 | ||
8728fe50 | 110 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
111 | { |
112 | int ret; | |
113 | struct trace_entry ent; | |
114 | ||
115 | __common_field(unsigned short, type); | |
116 | __common_field(unsigned char, flags); | |
117 | __common_field(unsigned char, preempt_count); | |
118 | __common_field(int, pid); | |
e647d6b3 LZ |
119 | |
120 | return ret; | |
121 | } | |
122 | ||
bd1a5c84 | 123 | void trace_destroy_fields(struct ftrace_event_call *call) |
2df75e41 LZ |
124 | { |
125 | struct ftrace_event_field *field, *next; | |
2e33af02 | 126 | struct list_head *head; |
2df75e41 | 127 | |
2e33af02 SR |
128 | head = trace_get_fields(call); |
129 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 LZ |
130 | list_del(&field->link); |
131 | kfree(field->type); | |
132 | kfree(field->name); | |
133 | kfree(field); | |
134 | } | |
135 | } | |
136 | ||
87d9b4e1 LZ |
137 | int trace_event_raw_init(struct ftrace_event_call *call) |
138 | { | |
139 | int id; | |
140 | ||
80decc70 | 141 | id = register_ftrace_event(&call->event); |
87d9b4e1 LZ |
142 | if (!id) |
143 | return -ENODEV; | |
87d9b4e1 LZ |
144 | |
145 | return 0; | |
146 | } | |
147 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
148 | ||
a1d0ce82 SR |
149 | int ftrace_event_reg(struct ftrace_event_call *call, enum trace_reg type) |
150 | { | |
151 | switch (type) { | |
152 | case TRACE_REG_REGISTER: | |
153 | return tracepoint_probe_register(call->name, | |
154 | call->class->probe, | |
155 | call); | |
156 | case TRACE_REG_UNREGISTER: | |
157 | tracepoint_probe_unregister(call->name, | |
158 | call->class->probe, | |
159 | call); | |
160 | return 0; | |
161 | ||
162 | #ifdef CONFIG_PERF_EVENTS | |
163 | case TRACE_REG_PERF_REGISTER: | |
164 | return tracepoint_probe_register(call->name, | |
165 | call->class->perf_probe, | |
166 | call); | |
167 | case TRACE_REG_PERF_UNREGISTER: | |
168 | tracepoint_probe_unregister(call->name, | |
169 | call->class->perf_probe, | |
170 | call); | |
171 | return 0; | |
172 | #endif | |
173 | } | |
174 | return 0; | |
175 | } | |
176 | EXPORT_SYMBOL_GPL(ftrace_event_reg); | |
177 | ||
e870e9a1 LZ |
178 | void trace_event_enable_cmd_record(bool enable) |
179 | { | |
180 | struct ftrace_event_call *call; | |
181 | ||
182 | mutex_lock(&event_mutex); | |
183 | list_for_each_entry(call, &ftrace_events, list) { | |
184 | if (!(call->flags & TRACE_EVENT_FL_ENABLED)) | |
185 | continue; | |
186 | ||
187 | if (enable) { | |
188 | tracing_start_cmdline_record(); | |
189 | call->flags |= TRACE_EVENT_FL_RECORDED_CMD; | |
190 | } else { | |
191 | tracing_stop_cmdline_record(); | |
192 | call->flags &= ~TRACE_EVENT_FL_RECORDED_CMD; | |
193 | } | |
194 | } | |
195 | mutex_unlock(&event_mutex); | |
196 | } | |
197 | ||
3b8e4273 | 198 | static int ftrace_event_enable_disable(struct ftrace_event_call *call, |
fd994989 SR |
199 | int enable) |
200 | { | |
3b8e4273 LZ |
201 | int ret = 0; |
202 | ||
fd994989 SR |
203 | switch (enable) { |
204 | case 0: | |
553552ce SR |
205 | if (call->flags & TRACE_EVENT_FL_ENABLED) { |
206 | call->flags &= ~TRACE_EVENT_FL_ENABLED; | |
e870e9a1 LZ |
207 | if (call->flags & TRACE_EVENT_FL_RECORDED_CMD) { |
208 | tracing_stop_cmdline_record(); | |
209 | call->flags &= ~TRACE_EVENT_FL_RECORDED_CMD; | |
210 | } | |
a1d0ce82 | 211 | call->class->reg(call, TRACE_REG_UNREGISTER); |
fd994989 | 212 | } |
fd994989 SR |
213 | break; |
214 | case 1: | |
553552ce | 215 | if (!(call->flags & TRACE_EVENT_FL_ENABLED)) { |
e870e9a1 LZ |
216 | if (trace_flags & TRACE_ITER_RECORD_CMD) { |
217 | tracing_start_cmdline_record(); | |
218 | call->flags |= TRACE_EVENT_FL_RECORDED_CMD; | |
219 | } | |
a1d0ce82 | 220 | ret = call->class->reg(call, TRACE_REG_REGISTER); |
3b8e4273 LZ |
221 | if (ret) { |
222 | tracing_stop_cmdline_record(); | |
223 | pr_info("event trace: Could not enable event " | |
224 | "%s\n", call->name); | |
225 | break; | |
226 | } | |
553552ce | 227 | call->flags |= TRACE_EVENT_FL_ENABLED; |
fd994989 | 228 | } |
fd994989 SR |
229 | break; |
230 | } | |
3b8e4273 LZ |
231 | |
232 | return ret; | |
fd994989 SR |
233 | } |
234 | ||
0e907c99 Z |
235 | static void ftrace_clear_events(void) |
236 | { | |
237 | struct ftrace_event_call *call; | |
238 | ||
239 | mutex_lock(&event_mutex); | |
240 | list_for_each_entry(call, &ftrace_events, list) { | |
241 | ftrace_event_enable_disable(call, 0); | |
242 | } | |
243 | mutex_unlock(&event_mutex); | |
244 | } | |
245 | ||
8f31bfe5 LZ |
246 | /* |
247 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
248 | */ | |
249 | static int __ftrace_set_clr_event(const char *match, const char *sub, | |
250 | const char *event, int set) | |
b77e38aa | 251 | { |
a59fd602 | 252 | struct ftrace_event_call *call; |
29f93943 | 253 | int ret = -EINVAL; |
8f31bfe5 LZ |
254 | |
255 | mutex_lock(&event_mutex); | |
256 | list_for_each_entry(call, &ftrace_events, list) { | |
257 | ||
a1d0ce82 | 258 | if (!call->name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
259 | continue; |
260 | ||
261 | if (match && | |
262 | strcmp(match, call->name) != 0 && | |
8f082018 | 263 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
264 | continue; |
265 | ||
8f082018 | 266 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
267 | continue; |
268 | ||
269 | if (event && strcmp(event, call->name) != 0) | |
270 | continue; | |
271 | ||
272 | ftrace_event_enable_disable(call, set); | |
273 | ||
274 | ret = 0; | |
275 | } | |
276 | mutex_unlock(&event_mutex); | |
277 | ||
278 | return ret; | |
279 | } | |
280 | ||
281 | static int ftrace_set_clr_event(char *buf, int set) | |
282 | { | |
b628b3e6 | 283 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
284 | |
285 | /* | |
286 | * The buf format can be <subsystem>:<event-name> | |
287 | * *:<event-name> means any event by that name. | |
288 | * :<event-name> is the same. | |
289 | * | |
290 | * <subsystem>:* means all events in that subsystem | |
291 | * <subsystem>: means the same. | |
292 | * | |
293 | * <name> (no ':') means all events in a subsystem with | |
294 | * the name <name> or any event that matches <name> | |
295 | */ | |
296 | ||
297 | match = strsep(&buf, ":"); | |
298 | if (buf) { | |
299 | sub = match; | |
300 | event = buf; | |
301 | match = NULL; | |
302 | ||
303 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
304 | sub = NULL; | |
305 | if (!strlen(event) || strcmp(event, "*") == 0) | |
306 | event = NULL; | |
307 | } | |
b77e38aa | 308 | |
8f31bfe5 | 309 | return __ftrace_set_clr_event(match, sub, event, set); |
b77e38aa SR |
310 | } |
311 | ||
4671c794 SR |
312 | /** |
313 | * trace_set_clr_event - enable or disable an event | |
314 | * @system: system name to match (NULL for any system) | |
315 | * @event: event name to match (NULL for all events, within system) | |
316 | * @set: 1 to enable, 0 to disable | |
317 | * | |
318 | * This is a way for other parts of the kernel to enable or disable | |
319 | * event recording. | |
320 | * | |
321 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
322 | * registered events. | |
323 | */ | |
324 | int trace_set_clr_event(const char *system, const char *event, int set) | |
325 | { | |
326 | return __ftrace_set_clr_event(NULL, system, event, set); | |
327 | } | |
328 | ||
b77e38aa SR |
329 | /* 128 should be much more than enough */ |
330 | #define EVENT_BUF_SIZE 127 | |
331 | ||
332 | static ssize_t | |
333 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
334 | size_t cnt, loff_t *ppos) | |
335 | { | |
48966364 | 336 | struct trace_parser parser; |
4ba7978e | 337 | ssize_t read, ret; |
b77e38aa | 338 | |
4ba7978e | 339 | if (!cnt) |
b77e38aa SR |
340 | return 0; |
341 | ||
1852fcce SR |
342 | ret = tracing_update_buffers(); |
343 | if (ret < 0) | |
344 | return ret; | |
345 | ||
48966364 | 346 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
347 | return -ENOMEM; |
348 | ||
48966364 | 349 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
350 | ||
4ba7978e | 351 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 352 | int set = 1; |
b77e38aa | 353 | |
48966364 | 354 | if (*parser.buffer == '!') |
b77e38aa | 355 | set = 0; |
b77e38aa | 356 | |
48966364 | 357 | parser.buffer[parser.idx] = 0; |
358 | ||
359 | ret = ftrace_set_clr_event(parser.buffer + !set, set); | |
b77e38aa | 360 | if (ret) |
48966364 | 361 | goto out_put; |
b77e38aa | 362 | } |
b77e38aa SR |
363 | |
364 | ret = read; | |
365 | ||
48966364 | 366 | out_put: |
367 | trace_parser_put(&parser); | |
b77e38aa SR |
368 | |
369 | return ret; | |
370 | } | |
371 | ||
372 | static void * | |
373 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
374 | { | |
30bd39cd | 375 | struct ftrace_event_call *call = v; |
b77e38aa SR |
376 | |
377 | (*pos)++; | |
378 | ||
30bd39cd | 379 | list_for_each_entry_continue(call, &ftrace_events, list) { |
40e26815 SR |
380 | /* |
381 | * The ftrace subsystem is for showing formats only. | |
382 | * They can not be enabled or disabled via the event files. | |
383 | */ | |
a1d0ce82 | 384 | if (call->class && call->class->reg) |
30bd39cd | 385 | return call; |
40e26815 | 386 | } |
b77e38aa | 387 | |
30bd39cd | 388 | return NULL; |
b77e38aa SR |
389 | } |
390 | ||
391 | static void *t_start(struct seq_file *m, loff_t *pos) | |
392 | { | |
30bd39cd | 393 | struct ftrace_event_call *call; |
e1c7e2a6 LZ |
394 | loff_t l; |
395 | ||
20c8928a | 396 | mutex_lock(&event_mutex); |
e1c7e2a6 | 397 | |
30bd39cd | 398 | call = list_entry(&ftrace_events, struct ftrace_event_call, list); |
e1c7e2a6 | 399 | for (l = 0; l <= *pos; ) { |
30bd39cd | 400 | call = t_next(m, call, &l); |
e1c7e2a6 LZ |
401 | if (!call) |
402 | break; | |
403 | } | |
404 | return call; | |
b77e38aa SR |
405 | } |
406 | ||
407 | static void * | |
408 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
409 | { | |
30bd39cd | 410 | struct ftrace_event_call *call = v; |
b77e38aa SR |
411 | |
412 | (*pos)++; | |
413 | ||
30bd39cd | 414 | list_for_each_entry_continue(call, &ftrace_events, list) { |
553552ce | 415 | if (call->flags & TRACE_EVENT_FL_ENABLED) |
30bd39cd | 416 | return call; |
b77e38aa SR |
417 | } |
418 | ||
30bd39cd | 419 | return NULL; |
b77e38aa SR |
420 | } |
421 | ||
422 | static void *s_start(struct seq_file *m, loff_t *pos) | |
423 | { | |
30bd39cd | 424 | struct ftrace_event_call *call; |
e1c7e2a6 LZ |
425 | loff_t l; |
426 | ||
20c8928a | 427 | mutex_lock(&event_mutex); |
e1c7e2a6 | 428 | |
30bd39cd | 429 | call = list_entry(&ftrace_events, struct ftrace_event_call, list); |
e1c7e2a6 | 430 | for (l = 0; l <= *pos; ) { |
30bd39cd | 431 | call = s_next(m, call, &l); |
e1c7e2a6 LZ |
432 | if (!call) |
433 | break; | |
434 | } | |
435 | return call; | |
b77e38aa SR |
436 | } |
437 | ||
438 | static int t_show(struct seq_file *m, void *v) | |
439 | { | |
440 | struct ftrace_event_call *call = v; | |
441 | ||
8f082018 SR |
442 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
443 | seq_printf(m, "%s:", call->class->system); | |
b77e38aa SR |
444 | seq_printf(m, "%s\n", call->name); |
445 | ||
446 | return 0; | |
447 | } | |
448 | ||
449 | static void t_stop(struct seq_file *m, void *p) | |
450 | { | |
20c8928a | 451 | mutex_unlock(&event_mutex); |
b77e38aa SR |
452 | } |
453 | ||
454 | static int | |
455 | ftrace_event_seq_open(struct inode *inode, struct file *file) | |
456 | { | |
b77e38aa SR |
457 | const struct seq_operations *seq_ops; |
458 | ||
459 | if ((file->f_mode & FMODE_WRITE) && | |
8650ae32 | 460 | (file->f_flags & O_TRUNC)) |
b77e38aa SR |
461 | ftrace_clear_events(); |
462 | ||
463 | seq_ops = inode->i_private; | |
20c8928a | 464 | return seq_open(file, seq_ops); |
b77e38aa SR |
465 | } |
466 | ||
1473e441 SR |
467 | static ssize_t |
468 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
469 | loff_t *ppos) | |
470 | { | |
471 | struct ftrace_event_call *call = filp->private_data; | |
472 | char *buf; | |
473 | ||
553552ce | 474 | if (call->flags & TRACE_EVENT_FL_ENABLED) |
1473e441 SR |
475 | buf = "1\n"; |
476 | else | |
477 | buf = "0\n"; | |
478 | ||
479 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
480 | } | |
481 | ||
482 | static ssize_t | |
483 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
484 | loff_t *ppos) | |
485 | { | |
486 | struct ftrace_event_call *call = filp->private_data; | |
487 | char buf[64]; | |
488 | unsigned long val; | |
489 | int ret; | |
490 | ||
491 | if (cnt >= sizeof(buf)) | |
492 | return -EINVAL; | |
493 | ||
494 | if (copy_from_user(&buf, ubuf, cnt)) | |
495 | return -EFAULT; | |
496 | ||
497 | buf[cnt] = 0; | |
498 | ||
499 | ret = strict_strtoul(buf, 10, &val); | |
500 | if (ret < 0) | |
501 | return ret; | |
502 | ||
1852fcce SR |
503 | ret = tracing_update_buffers(); |
504 | if (ret < 0) | |
505 | return ret; | |
506 | ||
1473e441 SR |
507 | switch (val) { |
508 | case 0: | |
1473e441 | 509 | case 1: |
11a241a3 | 510 | mutex_lock(&event_mutex); |
3b8e4273 | 511 | ret = ftrace_event_enable_disable(call, val); |
11a241a3 | 512 | mutex_unlock(&event_mutex); |
1473e441 SR |
513 | break; |
514 | ||
515 | default: | |
516 | return -EINVAL; | |
517 | } | |
518 | ||
519 | *ppos += cnt; | |
520 | ||
3b8e4273 | 521 | return ret ? ret : cnt; |
1473e441 SR |
522 | } |
523 | ||
8ae79a13 SR |
524 | static ssize_t |
525 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
526 | loff_t *ppos) | |
527 | { | |
c142b15d | 528 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
8ae79a13 SR |
529 | const char *system = filp->private_data; |
530 | struct ftrace_event_call *call; | |
531 | char buf[2]; | |
c142b15d | 532 | int set = 0; |
8ae79a13 SR |
533 | int ret; |
534 | ||
8ae79a13 SR |
535 | mutex_lock(&event_mutex); |
536 | list_for_each_entry(call, &ftrace_events, list) { | |
a1d0ce82 | 537 | if (!call->name || !call->class || !call->class->reg) |
8ae79a13 SR |
538 | continue; |
539 | ||
8f082018 | 540 | if (system && strcmp(call->class->system, system) != 0) |
8ae79a13 SR |
541 | continue; |
542 | ||
543 | /* | |
544 | * We need to find out if all the events are set | |
545 | * or if all events or cleared, or if we have | |
546 | * a mixture. | |
547 | */ | |
553552ce | 548 | set |= (1 << !!(call->flags & TRACE_EVENT_FL_ENABLED)); |
c142b15d | 549 | |
8ae79a13 SR |
550 | /* |
551 | * If we have a mixture, no need to look further. | |
552 | */ | |
c142b15d | 553 | if (set == 3) |
8ae79a13 SR |
554 | break; |
555 | } | |
556 | mutex_unlock(&event_mutex); | |
557 | ||
c142b15d | 558 | buf[0] = set_to_char[set]; |
8ae79a13 | 559 | buf[1] = '\n'; |
8ae79a13 SR |
560 | |
561 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
562 | ||
563 | return ret; | |
564 | } | |
565 | ||
566 | static ssize_t | |
567 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
568 | loff_t *ppos) | |
569 | { | |
570 | const char *system = filp->private_data; | |
571 | unsigned long val; | |
8ae79a13 SR |
572 | char buf[64]; |
573 | ssize_t ret; | |
574 | ||
575 | if (cnt >= sizeof(buf)) | |
576 | return -EINVAL; | |
577 | ||
578 | if (copy_from_user(&buf, ubuf, cnt)) | |
579 | return -EFAULT; | |
580 | ||
581 | buf[cnt] = 0; | |
582 | ||
583 | ret = strict_strtoul(buf, 10, &val); | |
584 | if (ret < 0) | |
585 | return ret; | |
586 | ||
587 | ret = tracing_update_buffers(); | |
588 | if (ret < 0) | |
589 | return ret; | |
590 | ||
8f31bfe5 | 591 | if (val != 0 && val != 1) |
8ae79a13 | 592 | return -EINVAL; |
8ae79a13 | 593 | |
8f31bfe5 | 594 | ret = __ftrace_set_clr_event(NULL, system, NULL, val); |
8ae79a13 | 595 | if (ret) |
8f31bfe5 | 596 | goto out; |
8ae79a13 SR |
597 | |
598 | ret = cnt; | |
599 | ||
8f31bfe5 | 600 | out: |
8ae79a13 SR |
601 | *ppos += cnt; |
602 | ||
603 | return ret; | |
604 | } | |
605 | ||
2a37a3df SR |
606 | enum { |
607 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
608 | FORMAT_FIELD_SEPERATOR = 2, |
609 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
610 | }; |
611 | ||
612 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 613 | { |
2a37a3df | 614 | struct ftrace_event_call *call = m->private; |
5a65e956 | 615 | struct ftrace_event_field *field; |
86397dc3 LZ |
616 | struct list_head *common_head = &ftrace_common_fields; |
617 | struct list_head *head = trace_get_fields(call); | |
981d081e | 618 | |
2a37a3df | 619 | (*pos)++; |
5a65e956 | 620 | |
2a37a3df SR |
621 | switch ((unsigned long)v) { |
622 | case FORMAT_HEADER: | |
86397dc3 LZ |
623 | if (unlikely(list_empty(common_head))) |
624 | return NULL; | |
625 | ||
626 | field = list_entry(common_head->prev, | |
627 | struct ftrace_event_field, link); | |
628 | return field; | |
5a65e956 | 629 | |
86397dc3 | 630 | case FORMAT_FIELD_SEPERATOR: |
2a37a3df SR |
631 | if (unlikely(list_empty(head))) |
632 | return NULL; | |
5a65e956 | 633 | |
2a37a3df SR |
634 | field = list_entry(head->prev, struct ftrace_event_field, link); |
635 | return field; | |
5a65e956 | 636 | |
2a37a3df SR |
637 | case FORMAT_PRINTFMT: |
638 | /* all done */ | |
639 | return NULL; | |
5a65e956 LJ |
640 | } |
641 | ||
2a37a3df | 642 | field = v; |
86397dc3 LZ |
643 | if (field->link.prev == common_head) |
644 | return (void *)FORMAT_FIELD_SEPERATOR; | |
645 | else if (field->link.prev == head) | |
2a37a3df SR |
646 | return (void *)FORMAT_PRINTFMT; |
647 | ||
648 | field = list_entry(field->link.prev, struct ftrace_event_field, link); | |
649 | ||
2a37a3df | 650 | return field; |
8728fe50 | 651 | } |
5a65e956 | 652 | |
2a37a3df | 653 | static void *f_start(struct seq_file *m, loff_t *pos) |
8728fe50 | 654 | { |
2a37a3df SR |
655 | loff_t l = 0; |
656 | void *p; | |
5a65e956 | 657 | |
2a37a3df SR |
658 | /* Start by showing the header */ |
659 | if (!*pos) | |
660 | return (void *)FORMAT_HEADER; | |
661 | ||
662 | p = (void *)FORMAT_HEADER; | |
663 | do { | |
664 | p = f_next(m, p, &l); | |
665 | } while (p && l < *pos); | |
666 | ||
667 | return p; | |
668 | } | |
669 | ||
670 | static int f_show(struct seq_file *m, void *v) | |
671 | { | |
672 | struct ftrace_event_call *call = m->private; | |
673 | struct ftrace_event_field *field; | |
674 | const char *array_descriptor; | |
675 | ||
676 | switch ((unsigned long)v) { | |
677 | case FORMAT_HEADER: | |
678 | seq_printf(m, "name: %s\n", call->name); | |
679 | seq_printf(m, "ID: %d\n", call->event.type); | |
680 | seq_printf(m, "format:\n"); | |
8728fe50 | 681 | return 0; |
5a65e956 | 682 | |
86397dc3 LZ |
683 | case FORMAT_FIELD_SEPERATOR: |
684 | seq_putc(m, '\n'); | |
685 | return 0; | |
686 | ||
2a37a3df SR |
687 | case FORMAT_PRINTFMT: |
688 | seq_printf(m, "\nprint fmt: %s\n", | |
689 | call->print_fmt); | |
690 | return 0; | |
981d081e | 691 | } |
8728fe50 | 692 | |
2a37a3df | 693 | field = v; |
8728fe50 | 694 | |
2a37a3df SR |
695 | /* |
696 | * Smartly shows the array type(except dynamic array). | |
697 | * Normal: | |
698 | * field:TYPE VAR | |
699 | * If TYPE := TYPE[LEN], it is shown: | |
700 | * field:TYPE VAR[LEN] | |
701 | */ | |
702 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 703 | |
2a37a3df SR |
704 | if (!strncmp(field->type, "__data_loc", 10)) |
705 | array_descriptor = NULL; | |
8728fe50 | 706 | |
2a37a3df SR |
707 | if (!array_descriptor) |
708 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
709 | field->type, field->name, field->offset, | |
710 | field->size, !!field->is_signed); | |
711 | else | |
712 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
713 | (int)(array_descriptor - field->type), | |
714 | field->type, field->name, | |
715 | array_descriptor, field->offset, | |
716 | field->size, !!field->is_signed); | |
8728fe50 | 717 | |
2a37a3df SR |
718 | return 0; |
719 | } | |
5a65e956 | 720 | |
2a37a3df SR |
721 | static void f_stop(struct seq_file *m, void *p) |
722 | { | |
723 | } | |
981d081e | 724 | |
2a37a3df SR |
725 | static const struct seq_operations trace_format_seq_ops = { |
726 | .start = f_start, | |
727 | .next = f_next, | |
728 | .stop = f_stop, | |
729 | .show = f_show, | |
730 | }; | |
731 | ||
732 | static int trace_format_open(struct inode *inode, struct file *file) | |
733 | { | |
734 | struct ftrace_event_call *call = inode->i_private; | |
735 | struct seq_file *m; | |
736 | int ret; | |
737 | ||
738 | ret = seq_open(file, &trace_format_seq_ops); | |
739 | if (ret < 0) | |
740 | return ret; | |
741 | ||
742 | m = file->private_data; | |
743 | m->private = call; | |
744 | ||
745 | return 0; | |
981d081e SR |
746 | } |
747 | ||
23725aee PZ |
748 | static ssize_t |
749 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
750 | { | |
751 | struct ftrace_event_call *call = filp->private_data; | |
752 | struct trace_seq *s; | |
753 | int r; | |
754 | ||
755 | if (*ppos) | |
756 | return 0; | |
757 | ||
758 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
759 | if (!s) | |
760 | return -ENOMEM; | |
761 | ||
762 | trace_seq_init(s); | |
32c0edae | 763 | trace_seq_printf(s, "%d\n", call->event.type); |
23725aee PZ |
764 | |
765 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
766 | s->buffer, s->len); | |
767 | kfree(s); | |
768 | return r; | |
769 | } | |
770 | ||
7ce7e424 TZ |
771 | static ssize_t |
772 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
773 | loff_t *ppos) | |
774 | { | |
775 | struct ftrace_event_call *call = filp->private_data; | |
776 | struct trace_seq *s; | |
777 | int r; | |
778 | ||
779 | if (*ppos) | |
780 | return 0; | |
781 | ||
782 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
783 | if (!s) | |
784 | return -ENOMEM; | |
785 | ||
786 | trace_seq_init(s); | |
787 | ||
8b372562 | 788 | print_event_filter(call, s); |
4bda2d51 | 789 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
790 | |
791 | kfree(s); | |
792 | ||
793 | return r; | |
794 | } | |
795 | ||
796 | static ssize_t | |
797 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
798 | loff_t *ppos) | |
799 | { | |
800 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 801 | char *buf; |
7ce7e424 TZ |
802 | int err; |
803 | ||
8b372562 | 804 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
805 | return -EINVAL; |
806 | ||
8b372562 TZ |
807 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
808 | if (!buf) | |
7ce7e424 TZ |
809 | return -ENOMEM; |
810 | ||
8b372562 TZ |
811 | if (copy_from_user(buf, ubuf, cnt)) { |
812 | free_page((unsigned long) buf); | |
813 | return -EFAULT; | |
7ce7e424 | 814 | } |
8b372562 | 815 | buf[cnt] = '\0'; |
7ce7e424 | 816 | |
8b372562 TZ |
817 | err = apply_event_filter(call, buf); |
818 | free_page((unsigned long) buf); | |
819 | if (err < 0) | |
44e9c8b7 | 820 | return err; |
0a19e53c | 821 | |
7ce7e424 TZ |
822 | *ppos += cnt; |
823 | ||
824 | return cnt; | |
825 | } | |
826 | ||
cfb180f3 TZ |
827 | static ssize_t |
828 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
829 | loff_t *ppos) | |
830 | { | |
831 | struct event_subsystem *system = filp->private_data; | |
832 | struct trace_seq *s; | |
833 | int r; | |
834 | ||
835 | if (*ppos) | |
836 | return 0; | |
837 | ||
838 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
839 | if (!s) | |
840 | return -ENOMEM; | |
841 | ||
842 | trace_seq_init(s); | |
843 | ||
8b372562 | 844 | print_subsystem_event_filter(system, s); |
4bda2d51 | 845 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
846 | |
847 | kfree(s); | |
848 | ||
849 | return r; | |
850 | } | |
851 | ||
852 | static ssize_t | |
853 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
854 | loff_t *ppos) | |
855 | { | |
856 | struct event_subsystem *system = filp->private_data; | |
8b372562 | 857 | char *buf; |
cfb180f3 TZ |
858 | int err; |
859 | ||
8b372562 | 860 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
861 | return -EINVAL; |
862 | ||
8b372562 TZ |
863 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
864 | if (!buf) | |
cfb180f3 TZ |
865 | return -ENOMEM; |
866 | ||
8b372562 TZ |
867 | if (copy_from_user(buf, ubuf, cnt)) { |
868 | free_page((unsigned long) buf); | |
869 | return -EFAULT; | |
cfb180f3 | 870 | } |
8b372562 | 871 | buf[cnt] = '\0'; |
cfb180f3 | 872 | |
8b372562 TZ |
873 | err = apply_subsystem_event_filter(system, buf); |
874 | free_page((unsigned long) buf); | |
875 | if (err < 0) | |
44e9c8b7 | 876 | return err; |
cfb180f3 TZ |
877 | |
878 | *ppos += cnt; | |
879 | ||
880 | return cnt; | |
881 | } | |
882 | ||
d1b182a8 SR |
883 | static ssize_t |
884 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
885 | { | |
886 | int (*func)(struct trace_seq *s) = filp->private_data; | |
887 | struct trace_seq *s; | |
888 | int r; | |
889 | ||
890 | if (*ppos) | |
891 | return 0; | |
892 | ||
893 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
894 | if (!s) | |
895 | return -ENOMEM; | |
896 | ||
897 | trace_seq_init(s); | |
898 | ||
899 | func(s); | |
900 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
901 | ||
902 | kfree(s); | |
903 | ||
904 | return r; | |
905 | } | |
906 | ||
b77e38aa SR |
907 | static const struct seq_operations show_event_seq_ops = { |
908 | .start = t_start, | |
909 | .next = t_next, | |
910 | .show = t_show, | |
911 | .stop = t_stop, | |
912 | }; | |
913 | ||
914 | static const struct seq_operations show_set_event_seq_ops = { | |
915 | .start = s_start, | |
916 | .next = s_next, | |
917 | .show = t_show, | |
918 | .stop = t_stop, | |
919 | }; | |
920 | ||
2314c4ae SR |
921 | static const struct file_operations ftrace_avail_fops = { |
922 | .open = ftrace_event_seq_open, | |
923 | .read = seq_read, | |
924 | .llseek = seq_lseek, | |
925 | .release = seq_release, | |
926 | }; | |
927 | ||
b77e38aa SR |
928 | static const struct file_operations ftrace_set_event_fops = { |
929 | .open = ftrace_event_seq_open, | |
930 | .read = seq_read, | |
931 | .write = ftrace_event_write, | |
932 | .llseek = seq_lseek, | |
933 | .release = seq_release, | |
934 | }; | |
935 | ||
1473e441 SR |
936 | static const struct file_operations ftrace_enable_fops = { |
937 | .open = tracing_open_generic, | |
938 | .read = event_enable_read, | |
939 | .write = event_enable_write, | |
6038f373 | 940 | .llseek = default_llseek, |
1473e441 SR |
941 | }; |
942 | ||
981d081e | 943 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
944 | .open = trace_format_open, |
945 | .read = seq_read, | |
946 | .llseek = seq_lseek, | |
947 | .release = seq_release, | |
981d081e SR |
948 | }; |
949 | ||
23725aee PZ |
950 | static const struct file_operations ftrace_event_id_fops = { |
951 | .open = tracing_open_generic, | |
952 | .read = event_id_read, | |
6038f373 | 953 | .llseek = default_llseek, |
23725aee PZ |
954 | }; |
955 | ||
7ce7e424 TZ |
956 | static const struct file_operations ftrace_event_filter_fops = { |
957 | .open = tracing_open_generic, | |
958 | .read = event_filter_read, | |
959 | .write = event_filter_write, | |
6038f373 | 960 | .llseek = default_llseek, |
7ce7e424 TZ |
961 | }; |
962 | ||
cfb180f3 TZ |
963 | static const struct file_operations ftrace_subsystem_filter_fops = { |
964 | .open = tracing_open_generic, | |
965 | .read = subsystem_filter_read, | |
966 | .write = subsystem_filter_write, | |
6038f373 | 967 | .llseek = default_llseek, |
cfb180f3 TZ |
968 | }; |
969 | ||
8ae79a13 SR |
970 | static const struct file_operations ftrace_system_enable_fops = { |
971 | .open = tracing_open_generic, | |
972 | .read = system_enable_read, | |
973 | .write = system_enable_write, | |
6038f373 | 974 | .llseek = default_llseek, |
8ae79a13 SR |
975 | }; |
976 | ||
d1b182a8 SR |
977 | static const struct file_operations ftrace_show_header_fops = { |
978 | .open = tracing_open_generic, | |
979 | .read = show_header, | |
6038f373 | 980 | .llseek = default_llseek, |
d1b182a8 SR |
981 | }; |
982 | ||
1473e441 SR |
983 | static struct dentry *event_trace_events_dir(void) |
984 | { | |
985 | static struct dentry *d_tracer; | |
986 | static struct dentry *d_events; | |
987 | ||
988 | if (d_events) | |
989 | return d_events; | |
990 | ||
991 | d_tracer = tracing_init_dentry(); | |
992 | if (!d_tracer) | |
993 | return NULL; | |
994 | ||
995 | d_events = debugfs_create_dir("events", d_tracer); | |
996 | if (!d_events) | |
997 | pr_warning("Could not create debugfs " | |
998 | "'events' directory\n"); | |
999 | ||
1000 | return d_events; | |
1001 | } | |
1002 | ||
6ecc2d1c SR |
1003 | static LIST_HEAD(event_subsystems); |
1004 | ||
1005 | static struct dentry * | |
1006 | event_subsystem_dir(const char *name, struct dentry *d_events) | |
1007 | { | |
1008 | struct event_subsystem *system; | |
e1112b4d | 1009 | struct dentry *entry; |
6ecc2d1c SR |
1010 | |
1011 | /* First see if we did not already create this dir */ | |
1012 | list_for_each_entry(system, &event_subsystems, list) { | |
dc82ec98 XG |
1013 | if (strcmp(system->name, name) == 0) { |
1014 | system->nr_events++; | |
6ecc2d1c | 1015 | return system->entry; |
dc82ec98 | 1016 | } |
6ecc2d1c SR |
1017 | } |
1018 | ||
1019 | /* need to create new entry */ | |
1020 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1021 | if (!system) { | |
1022 | pr_warning("No memory to create event subsystem %s\n", | |
1023 | name); | |
1024 | return d_events; | |
1025 | } | |
1026 | ||
1027 | system->entry = debugfs_create_dir(name, d_events); | |
1028 | if (!system->entry) { | |
1029 | pr_warning("Could not create event subsystem %s\n", | |
1030 | name); | |
1031 | kfree(system); | |
1032 | return d_events; | |
1033 | } | |
1034 | ||
dc82ec98 | 1035 | system->nr_events = 1; |
6d723736 SR |
1036 | system->name = kstrdup(name, GFP_KERNEL); |
1037 | if (!system->name) { | |
1038 | debugfs_remove(system->entry); | |
1039 | kfree(system); | |
1040 | return d_events; | |
1041 | } | |
1042 | ||
6ecc2d1c SR |
1043 | list_add(&system->list, &event_subsystems); |
1044 | ||
30e673b2 | 1045 | system->filter = NULL; |
cfb180f3 | 1046 | |
8b372562 TZ |
1047 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
1048 | if (!system->filter) { | |
1049 | pr_warning("Could not allocate filter for subsystem " | |
1050 | "'%s'\n", name); | |
1051 | return system->entry; | |
1052 | } | |
1053 | ||
e1112b4d TZ |
1054 | entry = debugfs_create_file("filter", 0644, system->entry, system, |
1055 | &ftrace_subsystem_filter_fops); | |
8b372562 TZ |
1056 | if (!entry) { |
1057 | kfree(system->filter); | |
1058 | system->filter = NULL; | |
e1112b4d TZ |
1059 | pr_warning("Could not create debugfs " |
1060 | "'%s/filter' entry\n", name); | |
8b372562 | 1061 | } |
e1112b4d | 1062 | |
f3f3f009 FW |
1063 | trace_create_file("enable", 0644, system->entry, |
1064 | (void *)system->name, | |
1065 | &ftrace_system_enable_fops); | |
8ae79a13 | 1066 | |
6ecc2d1c SR |
1067 | return system->entry; |
1068 | } | |
1069 | ||
1473e441 | 1070 | static int |
701970b3 SR |
1071 | event_create_dir(struct ftrace_event_call *call, struct dentry *d_events, |
1072 | const struct file_operations *id, | |
1073 | const struct file_operations *enable, | |
1074 | const struct file_operations *filter, | |
1075 | const struct file_operations *format) | |
1473e441 | 1076 | { |
2e33af02 | 1077 | struct list_head *head; |
fd994989 | 1078 | int ret; |
1473e441 | 1079 | |
6ecc2d1c SR |
1080 | /* |
1081 | * If the trace point header did not define TRACE_SYSTEM | |
1082 | * then the system would be called "TRACE_SYSTEM". | |
1083 | */ | |
8f082018 SR |
1084 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
1085 | d_events = event_subsystem_dir(call->class->system, d_events); | |
6ecc2d1c | 1086 | |
1473e441 SR |
1087 | call->dir = debugfs_create_dir(call->name, d_events); |
1088 | if (!call->dir) { | |
1089 | pr_warning("Could not create debugfs " | |
1090 | "'%s' directory\n", call->name); | |
1091 | return -1; | |
1092 | } | |
1093 | ||
a1d0ce82 | 1094 | if (call->class->reg) |
f3f3f009 FW |
1095 | trace_create_file("enable", 0644, call->dir, call, |
1096 | enable); | |
1473e441 | 1097 | |
2239291a | 1098 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 1099 | if (call->event.type && call->class->reg) |
f3f3f009 FW |
1100 | trace_create_file("id", 0444, call->dir, call, |
1101 | id); | |
2239291a | 1102 | #endif |
23725aee | 1103 | |
c9d932cf LZ |
1104 | /* |
1105 | * Other events may have the same class. Only update | |
1106 | * the fields if they are not already defined. | |
1107 | */ | |
1108 | head = trace_get_fields(call); | |
1109 | if (list_empty(head)) { | |
1110 | ret = call->class->define_fields(call); | |
1111 | if (ret < 0) { | |
1112 | pr_warning("Could not initialize trace point" | |
1113 | " events/%s\n", call->name); | |
1114 | return ret; | |
cf027f64 TZ |
1115 | } |
1116 | } | |
c9d932cf LZ |
1117 | trace_create_file("filter", 0644, call->dir, call, |
1118 | filter); | |
cf027f64 | 1119 | |
f3f3f009 FW |
1120 | trace_create_file("format", 0444, call->dir, call, |
1121 | format); | |
6d723736 SR |
1122 | |
1123 | return 0; | |
1124 | } | |
1125 | ||
67ead0a6 LZ |
1126 | static int |
1127 | __trace_add_event_call(struct ftrace_event_call *call, struct module *mod, | |
1128 | const struct file_operations *id, | |
1129 | const struct file_operations *enable, | |
1130 | const struct file_operations *filter, | |
1131 | const struct file_operations *format) | |
bd1a5c84 MH |
1132 | { |
1133 | struct dentry *d_events; | |
1134 | int ret; | |
6d723736 | 1135 | |
67ead0a6 | 1136 | /* The linker may leave blanks */ |
bd1a5c84 MH |
1137 | if (!call->name) |
1138 | return -EINVAL; | |
701970b3 | 1139 | |
0405ab80 SR |
1140 | if (call->class->raw_init) { |
1141 | ret = call->class->raw_init(call); | |
bd1a5c84 MH |
1142 | if (ret < 0) { |
1143 | if (ret != -ENOSYS) | |
67ead0a6 LZ |
1144 | pr_warning("Could not initialize trace events/%s\n", |
1145 | call->name); | |
bd1a5c84 MH |
1146 | return ret; |
1147 | } | |
1148 | } | |
701970b3 | 1149 | |
bd1a5c84 MH |
1150 | d_events = event_trace_events_dir(); |
1151 | if (!d_events) | |
1152 | return -ENOENT; | |
1153 | ||
67ead0a6 | 1154 | ret = event_create_dir(call, d_events, id, enable, filter, format); |
88f70d75 MH |
1155 | if (!ret) |
1156 | list_add(&call->list, &ftrace_events); | |
67ead0a6 | 1157 | call->mod = mod; |
88f70d75 | 1158 | |
588bebb7 | 1159 | return ret; |
bd1a5c84 MH |
1160 | } |
1161 | ||
1162 | /* Add an additional event_call dynamically */ | |
1163 | int trace_add_event_call(struct ftrace_event_call *call) | |
1164 | { | |
1165 | int ret; | |
1166 | mutex_lock(&event_mutex); | |
67ead0a6 LZ |
1167 | ret = __trace_add_event_call(call, NULL, &ftrace_event_id_fops, |
1168 | &ftrace_enable_fops, | |
1169 | &ftrace_event_filter_fops, | |
1170 | &ftrace_event_format_fops); | |
bd1a5c84 MH |
1171 | mutex_unlock(&event_mutex); |
1172 | return ret; | |
1173 | } | |
701970b3 | 1174 | |
a2ca5e03 FW |
1175 | static void remove_subsystem_dir(const char *name) |
1176 | { | |
1177 | struct event_subsystem *system; | |
1178 | ||
1179 | if (strcmp(name, TRACE_SYSTEM) == 0) | |
1180 | return; | |
1181 | ||
1182 | list_for_each_entry(system, &event_subsystems, list) { | |
1183 | if (strcmp(system->name, name) == 0) { | |
1184 | if (!--system->nr_events) { | |
1185 | struct event_filter *filter = system->filter; | |
1186 | ||
1187 | debugfs_remove_recursive(system->entry); | |
1188 | list_del(&system->list); | |
1189 | if (filter) { | |
1190 | kfree(filter->filter_string); | |
1191 | kfree(filter); | |
1192 | } | |
1193 | kfree(system->name); | |
1194 | kfree(system); | |
1195 | } | |
1196 | break; | |
1197 | } | |
1198 | } | |
1199 | } | |
1200 | ||
4fead8e4 MH |
1201 | /* |
1202 | * Must be called under locking both of event_mutex and trace_event_mutex. | |
1203 | */ | |
bd1a5c84 MH |
1204 | static void __trace_remove_event_call(struct ftrace_event_call *call) |
1205 | { | |
1206 | ftrace_event_enable_disable(call, 0); | |
80decc70 SR |
1207 | if (call->event.funcs) |
1208 | __unregister_ftrace_event(&call->event); | |
bd1a5c84 MH |
1209 | debugfs_remove_recursive(call->dir); |
1210 | list_del(&call->list); | |
1211 | trace_destroy_fields(call); | |
1212 | destroy_preds(call); | |
8f082018 | 1213 | remove_subsystem_dir(call->class->system); |
bd1a5c84 MH |
1214 | } |
1215 | ||
1216 | /* Remove an event_call */ | |
1217 | void trace_remove_event_call(struct ftrace_event_call *call) | |
1218 | { | |
1219 | mutex_lock(&event_mutex); | |
4fead8e4 | 1220 | down_write(&trace_event_mutex); |
bd1a5c84 | 1221 | __trace_remove_event_call(call); |
4fead8e4 | 1222 | up_write(&trace_event_mutex); |
bd1a5c84 MH |
1223 | mutex_unlock(&event_mutex); |
1224 | } | |
1225 | ||
1226 | #define for_each_event(event, start, end) \ | |
1227 | for (event = start; \ | |
1228 | (unsigned long)event < (unsigned long)end; \ | |
1229 | event++) | |
1230 | ||
1231 | #ifdef CONFIG_MODULES | |
1232 | ||
1233 | static LIST_HEAD(ftrace_module_file_list); | |
1234 | ||
1235 | /* | |
1236 | * Modules must own their file_operations to keep up with | |
1237 | * reference counting. | |
1238 | */ | |
1239 | struct ftrace_module_file_ops { | |
1240 | struct list_head list; | |
1241 | struct module *mod; | |
1242 | struct file_operations id; | |
1243 | struct file_operations enable; | |
1244 | struct file_operations format; | |
1245 | struct file_operations filter; | |
1246 | }; | |
1247 | ||
701970b3 SR |
1248 | static struct ftrace_module_file_ops * |
1249 | trace_create_file_ops(struct module *mod) | |
1250 | { | |
1251 | struct ftrace_module_file_ops *file_ops; | |
1252 | ||
1253 | /* | |
1254 | * This is a bit of a PITA. To allow for correct reference | |
1255 | * counting, modules must "own" their file_operations. | |
1256 | * To do this, we allocate the file operations that will be | |
1257 | * used in the event directory. | |
1258 | */ | |
1259 | ||
1260 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1261 | if (!file_ops) | |
1262 | return NULL; | |
1263 | ||
1264 | file_ops->mod = mod; | |
1265 | ||
1266 | file_ops->id = ftrace_event_id_fops; | |
1267 | file_ops->id.owner = mod; | |
1268 | ||
1269 | file_ops->enable = ftrace_enable_fops; | |
1270 | file_ops->enable.owner = mod; | |
1271 | ||
1272 | file_ops->filter = ftrace_event_filter_fops; | |
1273 | file_ops->filter.owner = mod; | |
1274 | ||
1275 | file_ops->format = ftrace_event_format_fops; | |
1276 | file_ops->format.owner = mod; | |
1277 | ||
1278 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1279 | ||
1280 | return file_ops; | |
1281 | } | |
1282 | ||
6d723736 SR |
1283 | static void trace_module_add_events(struct module *mod) |
1284 | { | |
701970b3 | 1285 | struct ftrace_module_file_ops *file_ops = NULL; |
e4a9ea5e | 1286 | struct ftrace_event_call **call, **start, **end; |
6d723736 SR |
1287 | |
1288 | start = mod->trace_events; | |
1289 | end = mod->trace_events + mod->num_trace_events; | |
1290 | ||
1291 | if (start == end) | |
1292 | return; | |
1293 | ||
67ead0a6 LZ |
1294 | file_ops = trace_create_file_ops(mod); |
1295 | if (!file_ops) | |
6d723736 SR |
1296 | return; |
1297 | ||
1298 | for_each_event(call, start, end) { | |
e4a9ea5e | 1299 | __trace_add_event_call(*call, mod, |
88f70d75 MH |
1300 | &file_ops->id, &file_ops->enable, |
1301 | &file_ops->filter, &file_ops->format); | |
6d723736 SR |
1302 | } |
1303 | } | |
1304 | ||
1305 | static void trace_module_remove_events(struct module *mod) | |
1306 | { | |
701970b3 | 1307 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1308 | struct ftrace_event_call *call, *p; |
9456f0fa | 1309 | bool found = false; |
6d723736 | 1310 | |
110bf2b7 | 1311 | down_write(&trace_event_mutex); |
6d723736 SR |
1312 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1313 | if (call->mod == mod) { | |
9456f0fa | 1314 | found = true; |
bd1a5c84 | 1315 | __trace_remove_event_call(call); |
6d723736 SR |
1316 | } |
1317 | } | |
701970b3 SR |
1318 | |
1319 | /* Now free the file_operations */ | |
1320 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1321 | if (file_ops->mod == mod) | |
1322 | break; | |
1323 | } | |
1324 | if (&file_ops->list != &ftrace_module_file_list) { | |
1325 | list_del(&file_ops->list); | |
1326 | kfree(file_ops); | |
1327 | } | |
9456f0fa SR |
1328 | |
1329 | /* | |
1330 | * It is safest to reset the ring buffer if the module being unloaded | |
1331 | * registered any events. | |
1332 | */ | |
1333 | if (found) | |
1334 | tracing_reset_current_online_cpus(); | |
110bf2b7 | 1335 | up_write(&trace_event_mutex); |
6d723736 SR |
1336 | } |
1337 | ||
61f919a1 SR |
1338 | static int trace_module_notify(struct notifier_block *self, |
1339 | unsigned long val, void *data) | |
6d723736 SR |
1340 | { |
1341 | struct module *mod = data; | |
1342 | ||
1343 | mutex_lock(&event_mutex); | |
1344 | switch (val) { | |
1345 | case MODULE_STATE_COMING: | |
1346 | trace_module_add_events(mod); | |
1347 | break; | |
1348 | case MODULE_STATE_GOING: | |
1349 | trace_module_remove_events(mod); | |
1350 | break; | |
1351 | } | |
1352 | mutex_unlock(&event_mutex); | |
fd994989 | 1353 | |
1473e441 SR |
1354 | return 0; |
1355 | } | |
61f919a1 SR |
1356 | #else |
1357 | static int trace_module_notify(struct notifier_block *self, | |
1358 | unsigned long val, void *data) | |
1359 | { | |
1360 | return 0; | |
1361 | } | |
1362 | #endif /* CONFIG_MODULES */ | |
1473e441 | 1363 | |
ec827c7e | 1364 | static struct notifier_block trace_module_nb = { |
6d723736 SR |
1365 | .notifier_call = trace_module_notify, |
1366 | .priority = 0, | |
1367 | }; | |
1368 | ||
e4a9ea5e SR |
1369 | extern struct ftrace_event_call *__start_ftrace_events[]; |
1370 | extern struct ftrace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 1371 | |
020e5f85 LZ |
1372 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
1373 | ||
1374 | static __init int setup_trace_event(char *str) | |
1375 | { | |
1376 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
1377 | ring_buffer_expanded = 1; | |
1378 | tracing_selftest_disabled = 1; | |
1379 | ||
1380 | return 1; | |
1381 | } | |
1382 | __setup("trace_event=", setup_trace_event); | |
1383 | ||
b77e38aa SR |
1384 | static __init int event_trace_init(void) |
1385 | { | |
e4a9ea5e | 1386 | struct ftrace_event_call **call; |
b77e38aa SR |
1387 | struct dentry *d_tracer; |
1388 | struct dentry *entry; | |
1473e441 | 1389 | struct dentry *d_events; |
6d723736 | 1390 | int ret; |
020e5f85 LZ |
1391 | char *buf = bootup_event_buf; |
1392 | char *token; | |
b77e38aa SR |
1393 | |
1394 | d_tracer = tracing_init_dentry(); | |
1395 | if (!d_tracer) | |
1396 | return 0; | |
1397 | ||
2314c4ae SR |
1398 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
1399 | (void *)&show_event_seq_ops, | |
1400 | &ftrace_avail_fops); | |
1401 | if (!entry) | |
1402 | pr_warning("Could not create debugfs " | |
1403 | "'available_events' entry\n"); | |
1404 | ||
b77e38aa SR |
1405 | entry = debugfs_create_file("set_event", 0644, d_tracer, |
1406 | (void *)&show_set_event_seq_ops, | |
1407 | &ftrace_set_event_fops); | |
1408 | if (!entry) | |
1409 | pr_warning("Could not create debugfs " | |
1410 | "'set_event' entry\n"); | |
1411 | ||
1473e441 SR |
1412 | d_events = event_trace_events_dir(); |
1413 | if (!d_events) | |
1414 | return 0; | |
1415 | ||
d1b182a8 SR |
1416 | /* ring buffer internal formats */ |
1417 | trace_create_file("header_page", 0444, d_events, | |
1418 | ring_buffer_print_page_header, | |
1419 | &ftrace_show_header_fops); | |
1420 | ||
1421 | trace_create_file("header_event", 0444, d_events, | |
1422 | ring_buffer_print_entry_header, | |
1423 | &ftrace_show_header_fops); | |
1424 | ||
8ae79a13 | 1425 | trace_create_file("enable", 0644, d_events, |
8f31bfe5 | 1426 | NULL, &ftrace_system_enable_fops); |
8ae79a13 | 1427 | |
8728fe50 LZ |
1428 | if (trace_define_common_fields()) |
1429 | pr_warning("tracing: Failed to allocate common fields"); | |
1430 | ||
6d723736 | 1431 | for_each_event(call, __start_ftrace_events, __stop_ftrace_events) { |
e4a9ea5e | 1432 | __trace_add_event_call(*call, NULL, &ftrace_event_id_fops, |
88f70d75 MH |
1433 | &ftrace_enable_fops, |
1434 | &ftrace_event_filter_fops, | |
1435 | &ftrace_event_format_fops); | |
1473e441 SR |
1436 | } |
1437 | ||
020e5f85 LZ |
1438 | while (true) { |
1439 | token = strsep(&buf, ","); | |
1440 | ||
1441 | if (!token) | |
1442 | break; | |
1443 | if (!*token) | |
1444 | continue; | |
1445 | ||
1446 | ret = ftrace_set_clr_event(token, 1); | |
1447 | if (ret) | |
1448 | pr_warning("Failed to enable trace event: %s\n", token); | |
1449 | } | |
1450 | ||
6d723736 | 1451 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 1452 | if (ret) |
6d723736 SR |
1453 | pr_warning("Failed to register trace events module notifier\n"); |
1454 | ||
b77e38aa SR |
1455 | return 0; |
1456 | } | |
1457 | fs_initcall(event_trace_init); | |
e6187007 SR |
1458 | |
1459 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1460 | ||
1461 | static DEFINE_SPINLOCK(test_spinlock); | |
1462 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
1463 | static DEFINE_MUTEX(test_mutex); | |
1464 | ||
1465 | static __init void test_work(struct work_struct *dummy) | |
1466 | { | |
1467 | spin_lock(&test_spinlock); | |
1468 | spin_lock_irq(&test_spinlock_irq); | |
1469 | udelay(1); | |
1470 | spin_unlock_irq(&test_spinlock_irq); | |
1471 | spin_unlock(&test_spinlock); | |
1472 | ||
1473 | mutex_lock(&test_mutex); | |
1474 | msleep(1); | |
1475 | mutex_unlock(&test_mutex); | |
1476 | } | |
1477 | ||
1478 | static __init int event_test_thread(void *unused) | |
1479 | { | |
1480 | void *test_malloc; | |
1481 | ||
1482 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
1483 | if (!test_malloc) | |
1484 | pr_info("failed to kmalloc\n"); | |
1485 | ||
1486 | schedule_on_each_cpu(test_work); | |
1487 | ||
1488 | kfree(test_malloc); | |
1489 | ||
1490 | set_current_state(TASK_INTERRUPTIBLE); | |
1491 | while (!kthread_should_stop()) | |
1492 | schedule(); | |
1493 | ||
1494 | return 0; | |
1495 | } | |
1496 | ||
1497 | /* | |
1498 | * Do various things that may trigger events. | |
1499 | */ | |
1500 | static __init void event_test_stuff(void) | |
1501 | { | |
1502 | struct task_struct *test_thread; | |
1503 | ||
1504 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
1505 | msleep(1); | |
1506 | kthread_stop(test_thread); | |
1507 | } | |
1508 | ||
1509 | /* | |
1510 | * For every trace event defined, we will test each trace point separately, | |
1511 | * and then by groups, and finally all trace points. | |
1512 | */ | |
9ea21c1e | 1513 | static __init void event_trace_self_tests(void) |
e6187007 SR |
1514 | { |
1515 | struct ftrace_event_call *call; | |
1516 | struct event_subsystem *system; | |
e6187007 SR |
1517 | int ret; |
1518 | ||
1519 | pr_info("Running tests on trace events:\n"); | |
1520 | ||
1521 | list_for_each_entry(call, &ftrace_events, list) { | |
1522 | ||
2239291a SR |
1523 | /* Only test those that have a probe */ |
1524 | if (!call->class || !call->class->probe) | |
e6187007 SR |
1525 | continue; |
1526 | ||
1f5a6b45 SR |
1527 | /* |
1528 | * Testing syscall events here is pretty useless, but | |
1529 | * we still do it if configured. But this is time consuming. | |
1530 | * What we really need is a user thread to perform the | |
1531 | * syscalls as we test. | |
1532 | */ | |
1533 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
1534 | if (call->class->system && |
1535 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
1536 | continue; |
1537 | #endif | |
1538 | ||
e6187007 SR |
1539 | pr_info("Testing event %s: ", call->name); |
1540 | ||
1541 | /* | |
1542 | * If an event is already enabled, someone is using | |
1543 | * it and the self test should not be on. | |
1544 | */ | |
553552ce | 1545 | if (call->flags & TRACE_EVENT_FL_ENABLED) { |
e6187007 SR |
1546 | pr_warning("Enabled event during self test!\n"); |
1547 | WARN_ON_ONCE(1); | |
1548 | continue; | |
1549 | } | |
1550 | ||
0e907c99 | 1551 | ftrace_event_enable_disable(call, 1); |
e6187007 | 1552 | event_test_stuff(); |
0e907c99 | 1553 | ftrace_event_enable_disable(call, 0); |
e6187007 SR |
1554 | |
1555 | pr_cont("OK\n"); | |
1556 | } | |
1557 | ||
1558 | /* Now test at the sub system level */ | |
1559 | ||
1560 | pr_info("Running tests on trace event systems:\n"); | |
1561 | ||
1562 | list_for_each_entry(system, &event_subsystems, list) { | |
1563 | ||
1564 | /* the ftrace system is special, skip it */ | |
1565 | if (strcmp(system->name, "ftrace") == 0) | |
1566 | continue; | |
1567 | ||
1568 | pr_info("Testing event system %s: ", system->name); | |
1569 | ||
8f31bfe5 | 1570 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1); |
e6187007 SR |
1571 | if (WARN_ON_ONCE(ret)) { |
1572 | pr_warning("error enabling system %s\n", | |
1573 | system->name); | |
1574 | continue; | |
1575 | } | |
1576 | ||
1577 | event_test_stuff(); | |
1578 | ||
8f31bfe5 | 1579 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0); |
e6187007 SR |
1580 | if (WARN_ON_ONCE(ret)) |
1581 | pr_warning("error disabling system %s\n", | |
1582 | system->name); | |
1583 | ||
1584 | pr_cont("OK\n"); | |
1585 | } | |
1586 | ||
1587 | /* Test with all events enabled */ | |
1588 | ||
1589 | pr_info("Running tests on all trace events:\n"); | |
1590 | pr_info("Testing all events: "); | |
1591 | ||
8f31bfe5 | 1592 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1); |
e6187007 | 1593 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 1594 | pr_warning("error enabling all events\n"); |
9ea21c1e | 1595 | return; |
e6187007 SR |
1596 | } |
1597 | ||
1598 | event_test_stuff(); | |
1599 | ||
1600 | /* reset sysname */ | |
8f31bfe5 | 1601 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0); |
e6187007 SR |
1602 | if (WARN_ON_ONCE(ret)) { |
1603 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 1604 | return; |
e6187007 SR |
1605 | } |
1606 | ||
1607 | pr_cont("OK\n"); | |
9ea21c1e SR |
1608 | } |
1609 | ||
1610 | #ifdef CONFIG_FUNCTION_TRACER | |
1611 | ||
245b2e70 | 1612 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e SR |
1613 | |
1614 | static void | |
1615 | function_test_events_call(unsigned long ip, unsigned long parent_ip) | |
1616 | { | |
1617 | struct ring_buffer_event *event; | |
e77405ad | 1618 | struct ring_buffer *buffer; |
9ea21c1e SR |
1619 | struct ftrace_entry *entry; |
1620 | unsigned long flags; | |
1621 | long disabled; | |
9ea21c1e SR |
1622 | int cpu; |
1623 | int pc; | |
1624 | ||
1625 | pc = preempt_count(); | |
5168ae50 | 1626 | preempt_disable_notrace(); |
9ea21c1e | 1627 | cpu = raw_smp_processor_id(); |
245b2e70 | 1628 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
1629 | |
1630 | if (disabled != 1) | |
1631 | goto out; | |
1632 | ||
1633 | local_save_flags(flags); | |
1634 | ||
e77405ad SR |
1635 | event = trace_current_buffer_lock_reserve(&buffer, |
1636 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
1637 | flags, pc); |
1638 | if (!event) | |
1639 | goto out; | |
1640 | entry = ring_buffer_event_data(event); | |
1641 | entry->ip = ip; | |
1642 | entry->parent_ip = parent_ip; | |
1643 | ||
e77405ad | 1644 | trace_nowake_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
1645 | |
1646 | out: | |
245b2e70 | 1647 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 1648 | preempt_enable_notrace(); |
9ea21c1e SR |
1649 | } |
1650 | ||
1651 | static struct ftrace_ops trace_ops __initdata = | |
1652 | { | |
1653 | .func = function_test_events_call, | |
1654 | }; | |
1655 | ||
1656 | static __init void event_trace_self_test_with_function(void) | |
1657 | { | |
1658 | register_ftrace_function(&trace_ops); | |
1659 | pr_info("Running tests again, along with the function tracer\n"); | |
1660 | event_trace_self_tests(); | |
1661 | unregister_ftrace_function(&trace_ops); | |
1662 | } | |
1663 | #else | |
1664 | static __init void event_trace_self_test_with_function(void) | |
1665 | { | |
1666 | } | |
1667 | #endif | |
1668 | ||
1669 | static __init int event_trace_self_tests_init(void) | |
1670 | { | |
020e5f85 LZ |
1671 | if (!tracing_selftest_disabled) { |
1672 | event_trace_self_tests(); | |
1673 | event_trace_self_test_with_function(); | |
1674 | } | |
e6187007 SR |
1675 | |
1676 | return 0; | |
1677 | } | |
1678 | ||
28d20e2d | 1679 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
1680 | |
1681 | #endif |