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); | |
637e7e86 | 119 | __common_field(int, lock_depth); |
e647d6b3 LZ |
120 | |
121 | return ret; | |
122 | } | |
123 | ||
bd1a5c84 | 124 | void trace_destroy_fields(struct ftrace_event_call *call) |
2df75e41 LZ |
125 | { |
126 | struct ftrace_event_field *field, *next; | |
2e33af02 | 127 | struct list_head *head; |
2df75e41 | 128 | |
2e33af02 SR |
129 | head = trace_get_fields(call); |
130 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 LZ |
131 | list_del(&field->link); |
132 | kfree(field->type); | |
133 | kfree(field->name); | |
134 | kfree(field); | |
135 | } | |
136 | } | |
137 | ||
87d9b4e1 LZ |
138 | int trace_event_raw_init(struct ftrace_event_call *call) |
139 | { | |
140 | int id; | |
141 | ||
80decc70 | 142 | id = register_ftrace_event(&call->event); |
87d9b4e1 LZ |
143 | if (!id) |
144 | return -ENODEV; | |
87d9b4e1 LZ |
145 | |
146 | return 0; | |
147 | } | |
148 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
149 | ||
a1d0ce82 SR |
150 | int ftrace_event_reg(struct ftrace_event_call *call, enum trace_reg type) |
151 | { | |
152 | switch (type) { | |
153 | case TRACE_REG_REGISTER: | |
154 | return tracepoint_probe_register(call->name, | |
155 | call->class->probe, | |
156 | call); | |
157 | case TRACE_REG_UNREGISTER: | |
158 | tracepoint_probe_unregister(call->name, | |
159 | call->class->probe, | |
160 | call); | |
161 | return 0; | |
162 | ||
163 | #ifdef CONFIG_PERF_EVENTS | |
164 | case TRACE_REG_PERF_REGISTER: | |
165 | return tracepoint_probe_register(call->name, | |
166 | call->class->perf_probe, | |
167 | call); | |
168 | case TRACE_REG_PERF_UNREGISTER: | |
169 | tracepoint_probe_unregister(call->name, | |
170 | call->class->perf_probe, | |
171 | call); | |
172 | return 0; | |
173 | #endif | |
174 | } | |
175 | return 0; | |
176 | } | |
177 | EXPORT_SYMBOL_GPL(ftrace_event_reg); | |
178 | ||
e870e9a1 LZ |
179 | void trace_event_enable_cmd_record(bool enable) |
180 | { | |
181 | struct ftrace_event_call *call; | |
182 | ||
183 | mutex_lock(&event_mutex); | |
184 | list_for_each_entry(call, &ftrace_events, list) { | |
185 | if (!(call->flags & TRACE_EVENT_FL_ENABLED)) | |
186 | continue; | |
187 | ||
188 | if (enable) { | |
189 | tracing_start_cmdline_record(); | |
190 | call->flags |= TRACE_EVENT_FL_RECORDED_CMD; | |
191 | } else { | |
192 | tracing_stop_cmdline_record(); | |
193 | call->flags &= ~TRACE_EVENT_FL_RECORDED_CMD; | |
194 | } | |
195 | } | |
196 | mutex_unlock(&event_mutex); | |
197 | } | |
198 | ||
3b8e4273 | 199 | static int ftrace_event_enable_disable(struct ftrace_event_call *call, |
fd994989 SR |
200 | int enable) |
201 | { | |
3b8e4273 LZ |
202 | int ret = 0; |
203 | ||
fd994989 SR |
204 | switch (enable) { |
205 | case 0: | |
553552ce SR |
206 | if (call->flags & TRACE_EVENT_FL_ENABLED) { |
207 | call->flags &= ~TRACE_EVENT_FL_ENABLED; | |
e870e9a1 LZ |
208 | if (call->flags & TRACE_EVENT_FL_RECORDED_CMD) { |
209 | tracing_stop_cmdline_record(); | |
210 | call->flags &= ~TRACE_EVENT_FL_RECORDED_CMD; | |
211 | } | |
a1d0ce82 | 212 | call->class->reg(call, TRACE_REG_UNREGISTER); |
fd994989 | 213 | } |
fd994989 SR |
214 | break; |
215 | case 1: | |
553552ce | 216 | if (!(call->flags & TRACE_EVENT_FL_ENABLED)) { |
e870e9a1 LZ |
217 | if (trace_flags & TRACE_ITER_RECORD_CMD) { |
218 | tracing_start_cmdline_record(); | |
219 | call->flags |= TRACE_EVENT_FL_RECORDED_CMD; | |
220 | } | |
a1d0ce82 | 221 | ret = call->class->reg(call, TRACE_REG_REGISTER); |
3b8e4273 LZ |
222 | if (ret) { |
223 | tracing_stop_cmdline_record(); | |
224 | pr_info("event trace: Could not enable event " | |
225 | "%s\n", call->name); | |
226 | break; | |
227 | } | |
553552ce | 228 | call->flags |= TRACE_EVENT_FL_ENABLED; |
fd994989 | 229 | } |
fd994989 SR |
230 | break; |
231 | } | |
3b8e4273 LZ |
232 | |
233 | return ret; | |
fd994989 SR |
234 | } |
235 | ||
0e907c99 Z |
236 | static void ftrace_clear_events(void) |
237 | { | |
238 | struct ftrace_event_call *call; | |
239 | ||
240 | mutex_lock(&event_mutex); | |
241 | list_for_each_entry(call, &ftrace_events, list) { | |
242 | ftrace_event_enable_disable(call, 0); | |
243 | } | |
244 | mutex_unlock(&event_mutex); | |
245 | } | |
246 | ||
8f31bfe5 LZ |
247 | /* |
248 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
249 | */ | |
250 | static int __ftrace_set_clr_event(const char *match, const char *sub, | |
251 | const char *event, int set) | |
b77e38aa | 252 | { |
a59fd602 | 253 | struct ftrace_event_call *call; |
29f93943 | 254 | int ret = -EINVAL; |
8f31bfe5 LZ |
255 | |
256 | mutex_lock(&event_mutex); | |
257 | list_for_each_entry(call, &ftrace_events, list) { | |
258 | ||
a1d0ce82 | 259 | if (!call->name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
260 | continue; |
261 | ||
262 | if (match && | |
263 | strcmp(match, call->name) != 0 && | |
8f082018 | 264 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
265 | continue; |
266 | ||
8f082018 | 267 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
268 | continue; |
269 | ||
270 | if (event && strcmp(event, call->name) != 0) | |
271 | continue; | |
272 | ||
273 | ftrace_event_enable_disable(call, set); | |
274 | ||
275 | ret = 0; | |
276 | } | |
277 | mutex_unlock(&event_mutex); | |
278 | ||
279 | return ret; | |
280 | } | |
281 | ||
282 | static int ftrace_set_clr_event(char *buf, int set) | |
283 | { | |
b628b3e6 | 284 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
285 | |
286 | /* | |
287 | * The buf format can be <subsystem>:<event-name> | |
288 | * *:<event-name> means any event by that name. | |
289 | * :<event-name> is the same. | |
290 | * | |
291 | * <subsystem>:* means all events in that subsystem | |
292 | * <subsystem>: means the same. | |
293 | * | |
294 | * <name> (no ':') means all events in a subsystem with | |
295 | * the name <name> or any event that matches <name> | |
296 | */ | |
297 | ||
298 | match = strsep(&buf, ":"); | |
299 | if (buf) { | |
300 | sub = match; | |
301 | event = buf; | |
302 | match = NULL; | |
303 | ||
304 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
305 | sub = NULL; | |
306 | if (!strlen(event) || strcmp(event, "*") == 0) | |
307 | event = NULL; | |
308 | } | |
b77e38aa | 309 | |
8f31bfe5 | 310 | return __ftrace_set_clr_event(match, sub, event, set); |
b77e38aa SR |
311 | } |
312 | ||
4671c794 SR |
313 | /** |
314 | * trace_set_clr_event - enable or disable an event | |
315 | * @system: system name to match (NULL for any system) | |
316 | * @event: event name to match (NULL for all events, within system) | |
317 | * @set: 1 to enable, 0 to disable | |
318 | * | |
319 | * This is a way for other parts of the kernel to enable or disable | |
320 | * event recording. | |
321 | * | |
322 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
323 | * registered events. | |
324 | */ | |
325 | int trace_set_clr_event(const char *system, const char *event, int set) | |
326 | { | |
327 | return __ftrace_set_clr_event(NULL, system, event, set); | |
328 | } | |
329 | ||
b77e38aa SR |
330 | /* 128 should be much more than enough */ |
331 | #define EVENT_BUF_SIZE 127 | |
332 | ||
333 | static ssize_t | |
334 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
335 | size_t cnt, loff_t *ppos) | |
336 | { | |
48966364 | 337 | struct trace_parser parser; |
4ba7978e | 338 | ssize_t read, ret; |
b77e38aa | 339 | |
4ba7978e | 340 | if (!cnt) |
b77e38aa SR |
341 | return 0; |
342 | ||
1852fcce SR |
343 | ret = tracing_update_buffers(); |
344 | if (ret < 0) | |
345 | return ret; | |
346 | ||
48966364 | 347 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
348 | return -ENOMEM; |
349 | ||
48966364 | 350 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
351 | ||
4ba7978e | 352 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 353 | int set = 1; |
b77e38aa | 354 | |
48966364 | 355 | if (*parser.buffer == '!') |
b77e38aa | 356 | set = 0; |
b77e38aa | 357 | |
48966364 | 358 | parser.buffer[parser.idx] = 0; |
359 | ||
360 | ret = ftrace_set_clr_event(parser.buffer + !set, set); | |
b77e38aa | 361 | if (ret) |
48966364 | 362 | goto out_put; |
b77e38aa | 363 | } |
b77e38aa SR |
364 | |
365 | ret = read; | |
366 | ||
48966364 | 367 | out_put: |
368 | trace_parser_put(&parser); | |
b77e38aa SR |
369 | |
370 | return ret; | |
371 | } | |
372 | ||
373 | static void * | |
374 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
375 | { | |
30bd39cd | 376 | struct ftrace_event_call *call = v; |
b77e38aa SR |
377 | |
378 | (*pos)++; | |
379 | ||
30bd39cd | 380 | list_for_each_entry_continue(call, &ftrace_events, list) { |
40e26815 SR |
381 | /* |
382 | * The ftrace subsystem is for showing formats only. | |
383 | * They can not be enabled or disabled via the event files. | |
384 | */ | |
a1d0ce82 | 385 | if (call->class && call->class->reg) |
30bd39cd | 386 | return call; |
40e26815 | 387 | } |
b77e38aa | 388 | |
30bd39cd | 389 | return NULL; |
b77e38aa SR |
390 | } |
391 | ||
392 | static void *t_start(struct seq_file *m, loff_t *pos) | |
393 | { | |
30bd39cd | 394 | struct ftrace_event_call *call; |
e1c7e2a6 LZ |
395 | loff_t l; |
396 | ||
20c8928a | 397 | mutex_lock(&event_mutex); |
e1c7e2a6 | 398 | |
30bd39cd | 399 | call = list_entry(&ftrace_events, struct ftrace_event_call, list); |
e1c7e2a6 | 400 | for (l = 0; l <= *pos; ) { |
30bd39cd | 401 | call = t_next(m, call, &l); |
e1c7e2a6 LZ |
402 | if (!call) |
403 | break; | |
404 | } | |
405 | return call; | |
b77e38aa SR |
406 | } |
407 | ||
408 | static void * | |
409 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
410 | { | |
30bd39cd | 411 | struct ftrace_event_call *call = v; |
b77e38aa SR |
412 | |
413 | (*pos)++; | |
414 | ||
30bd39cd | 415 | list_for_each_entry_continue(call, &ftrace_events, list) { |
553552ce | 416 | if (call->flags & TRACE_EVENT_FL_ENABLED) |
30bd39cd | 417 | return call; |
b77e38aa SR |
418 | } |
419 | ||
30bd39cd | 420 | return NULL; |
b77e38aa SR |
421 | } |
422 | ||
423 | static void *s_start(struct seq_file *m, loff_t *pos) | |
424 | { | |
30bd39cd | 425 | struct ftrace_event_call *call; |
e1c7e2a6 LZ |
426 | loff_t l; |
427 | ||
20c8928a | 428 | mutex_lock(&event_mutex); |
e1c7e2a6 | 429 | |
30bd39cd | 430 | call = list_entry(&ftrace_events, struct ftrace_event_call, list); |
e1c7e2a6 | 431 | for (l = 0; l <= *pos; ) { |
30bd39cd | 432 | call = s_next(m, call, &l); |
e1c7e2a6 LZ |
433 | if (!call) |
434 | break; | |
435 | } | |
436 | return call; | |
b77e38aa SR |
437 | } |
438 | ||
439 | static int t_show(struct seq_file *m, void *v) | |
440 | { | |
441 | struct ftrace_event_call *call = v; | |
442 | ||
8f082018 SR |
443 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
444 | seq_printf(m, "%s:", call->class->system); | |
b77e38aa SR |
445 | seq_printf(m, "%s\n", call->name); |
446 | ||
447 | return 0; | |
448 | } | |
449 | ||
450 | static void t_stop(struct seq_file *m, void *p) | |
451 | { | |
20c8928a | 452 | mutex_unlock(&event_mutex); |
b77e38aa SR |
453 | } |
454 | ||
455 | static int | |
456 | ftrace_event_seq_open(struct inode *inode, struct file *file) | |
457 | { | |
b77e38aa SR |
458 | const struct seq_operations *seq_ops; |
459 | ||
460 | if ((file->f_mode & FMODE_WRITE) && | |
8650ae32 | 461 | (file->f_flags & O_TRUNC)) |
b77e38aa SR |
462 | ftrace_clear_events(); |
463 | ||
464 | seq_ops = inode->i_private; | |
20c8928a | 465 | return seq_open(file, seq_ops); |
b77e38aa SR |
466 | } |
467 | ||
1473e441 SR |
468 | static ssize_t |
469 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
470 | loff_t *ppos) | |
471 | { | |
472 | struct ftrace_event_call *call = filp->private_data; | |
473 | char *buf; | |
474 | ||
553552ce | 475 | if (call->flags & TRACE_EVENT_FL_ENABLED) |
1473e441 SR |
476 | buf = "1\n"; |
477 | else | |
478 | buf = "0\n"; | |
479 | ||
480 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
481 | } | |
482 | ||
483 | static ssize_t | |
484 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
485 | loff_t *ppos) | |
486 | { | |
487 | struct ftrace_event_call *call = filp->private_data; | |
488 | char buf[64]; | |
489 | unsigned long val; | |
490 | int ret; | |
491 | ||
492 | if (cnt >= sizeof(buf)) | |
493 | return -EINVAL; | |
494 | ||
495 | if (copy_from_user(&buf, ubuf, cnt)) | |
496 | return -EFAULT; | |
497 | ||
498 | buf[cnt] = 0; | |
499 | ||
500 | ret = strict_strtoul(buf, 10, &val); | |
501 | if (ret < 0) | |
502 | return ret; | |
503 | ||
1852fcce SR |
504 | ret = tracing_update_buffers(); |
505 | if (ret < 0) | |
506 | return ret; | |
507 | ||
1473e441 SR |
508 | switch (val) { |
509 | case 0: | |
1473e441 | 510 | case 1: |
11a241a3 | 511 | mutex_lock(&event_mutex); |
3b8e4273 | 512 | ret = ftrace_event_enable_disable(call, val); |
11a241a3 | 513 | mutex_unlock(&event_mutex); |
1473e441 SR |
514 | break; |
515 | ||
516 | default: | |
517 | return -EINVAL; | |
518 | } | |
519 | ||
520 | *ppos += cnt; | |
521 | ||
3b8e4273 | 522 | return ret ? ret : cnt; |
1473e441 SR |
523 | } |
524 | ||
8ae79a13 SR |
525 | static ssize_t |
526 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
527 | loff_t *ppos) | |
528 | { | |
c142b15d | 529 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
8ae79a13 SR |
530 | const char *system = filp->private_data; |
531 | struct ftrace_event_call *call; | |
532 | char buf[2]; | |
c142b15d | 533 | int set = 0; |
8ae79a13 SR |
534 | int ret; |
535 | ||
8ae79a13 SR |
536 | mutex_lock(&event_mutex); |
537 | list_for_each_entry(call, &ftrace_events, list) { | |
a1d0ce82 | 538 | if (!call->name || !call->class || !call->class->reg) |
8ae79a13 SR |
539 | continue; |
540 | ||
8f082018 | 541 | if (system && strcmp(call->class->system, system) != 0) |
8ae79a13 SR |
542 | continue; |
543 | ||
544 | /* | |
545 | * We need to find out if all the events are set | |
546 | * or if all events or cleared, or if we have | |
547 | * a mixture. | |
548 | */ | |
553552ce | 549 | set |= (1 << !!(call->flags & TRACE_EVENT_FL_ENABLED)); |
c142b15d | 550 | |
8ae79a13 SR |
551 | /* |
552 | * If we have a mixture, no need to look further. | |
553 | */ | |
c142b15d | 554 | if (set == 3) |
8ae79a13 SR |
555 | break; |
556 | } | |
557 | mutex_unlock(&event_mutex); | |
558 | ||
c142b15d | 559 | buf[0] = set_to_char[set]; |
8ae79a13 | 560 | buf[1] = '\n'; |
8ae79a13 SR |
561 | |
562 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
563 | ||
564 | return ret; | |
565 | } | |
566 | ||
567 | static ssize_t | |
568 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
569 | loff_t *ppos) | |
570 | { | |
571 | const char *system = filp->private_data; | |
572 | unsigned long val; | |
8ae79a13 SR |
573 | char buf[64]; |
574 | ssize_t ret; | |
575 | ||
576 | if (cnt >= sizeof(buf)) | |
577 | return -EINVAL; | |
578 | ||
579 | if (copy_from_user(&buf, ubuf, cnt)) | |
580 | return -EFAULT; | |
581 | ||
582 | buf[cnt] = 0; | |
583 | ||
584 | ret = strict_strtoul(buf, 10, &val); | |
585 | if (ret < 0) | |
586 | return ret; | |
587 | ||
588 | ret = tracing_update_buffers(); | |
589 | if (ret < 0) | |
590 | return ret; | |
591 | ||
8f31bfe5 | 592 | if (val != 0 && val != 1) |
8ae79a13 | 593 | return -EINVAL; |
8ae79a13 | 594 | |
8f31bfe5 | 595 | ret = __ftrace_set_clr_event(NULL, system, NULL, val); |
8ae79a13 | 596 | if (ret) |
8f31bfe5 | 597 | goto out; |
8ae79a13 SR |
598 | |
599 | ret = cnt; | |
600 | ||
8f31bfe5 | 601 | out: |
8ae79a13 SR |
602 | *ppos += cnt; |
603 | ||
604 | return ret; | |
605 | } | |
606 | ||
2a37a3df SR |
607 | enum { |
608 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
609 | FORMAT_FIELD_SEPERATOR = 2, |
610 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
611 | }; |
612 | ||
613 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 614 | { |
2a37a3df | 615 | struct ftrace_event_call *call = m->private; |
5a65e956 | 616 | struct ftrace_event_field *field; |
86397dc3 LZ |
617 | struct list_head *common_head = &ftrace_common_fields; |
618 | struct list_head *head = trace_get_fields(call); | |
981d081e | 619 | |
2a37a3df | 620 | (*pos)++; |
5a65e956 | 621 | |
2a37a3df SR |
622 | switch ((unsigned long)v) { |
623 | case FORMAT_HEADER: | |
86397dc3 LZ |
624 | if (unlikely(list_empty(common_head))) |
625 | return NULL; | |
626 | ||
627 | field = list_entry(common_head->prev, | |
628 | struct ftrace_event_field, link); | |
629 | return field; | |
5a65e956 | 630 | |
86397dc3 | 631 | case FORMAT_FIELD_SEPERATOR: |
2a37a3df SR |
632 | if (unlikely(list_empty(head))) |
633 | return NULL; | |
5a65e956 | 634 | |
2a37a3df SR |
635 | field = list_entry(head->prev, struct ftrace_event_field, link); |
636 | return field; | |
5a65e956 | 637 | |
2a37a3df SR |
638 | case FORMAT_PRINTFMT: |
639 | /* all done */ | |
640 | return NULL; | |
5a65e956 LJ |
641 | } |
642 | ||
2a37a3df | 643 | field = v; |
86397dc3 LZ |
644 | if (field->link.prev == common_head) |
645 | return (void *)FORMAT_FIELD_SEPERATOR; | |
646 | else if (field->link.prev == head) | |
2a37a3df SR |
647 | return (void *)FORMAT_PRINTFMT; |
648 | ||
649 | field = list_entry(field->link.prev, struct ftrace_event_field, link); | |
650 | ||
2a37a3df | 651 | return field; |
8728fe50 | 652 | } |
5a65e956 | 653 | |
2a37a3df | 654 | static void *f_start(struct seq_file *m, loff_t *pos) |
8728fe50 | 655 | { |
2a37a3df SR |
656 | loff_t l = 0; |
657 | void *p; | |
5a65e956 | 658 | |
2a37a3df SR |
659 | /* Start by showing the header */ |
660 | if (!*pos) | |
661 | return (void *)FORMAT_HEADER; | |
662 | ||
663 | p = (void *)FORMAT_HEADER; | |
664 | do { | |
665 | p = f_next(m, p, &l); | |
666 | } while (p && l < *pos); | |
667 | ||
668 | return p; | |
669 | } | |
670 | ||
671 | static int f_show(struct seq_file *m, void *v) | |
672 | { | |
673 | struct ftrace_event_call *call = m->private; | |
674 | struct ftrace_event_field *field; | |
675 | const char *array_descriptor; | |
676 | ||
677 | switch ((unsigned long)v) { | |
678 | case FORMAT_HEADER: | |
679 | seq_printf(m, "name: %s\n", call->name); | |
680 | seq_printf(m, "ID: %d\n", call->event.type); | |
681 | seq_printf(m, "format:\n"); | |
8728fe50 | 682 | return 0; |
5a65e956 | 683 | |
86397dc3 LZ |
684 | case FORMAT_FIELD_SEPERATOR: |
685 | seq_putc(m, '\n'); | |
686 | return 0; | |
687 | ||
2a37a3df SR |
688 | case FORMAT_PRINTFMT: |
689 | seq_printf(m, "\nprint fmt: %s\n", | |
690 | call->print_fmt); | |
691 | return 0; | |
981d081e | 692 | } |
8728fe50 | 693 | |
2a37a3df | 694 | field = v; |
8728fe50 | 695 | |
2a37a3df SR |
696 | /* |
697 | * Smartly shows the array type(except dynamic array). | |
698 | * Normal: | |
699 | * field:TYPE VAR | |
700 | * If TYPE := TYPE[LEN], it is shown: | |
701 | * field:TYPE VAR[LEN] | |
702 | */ | |
703 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 704 | |
2a37a3df SR |
705 | if (!strncmp(field->type, "__data_loc", 10)) |
706 | array_descriptor = NULL; | |
8728fe50 | 707 | |
2a37a3df SR |
708 | if (!array_descriptor) |
709 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
710 | field->type, field->name, field->offset, | |
711 | field->size, !!field->is_signed); | |
712 | else | |
713 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
714 | (int)(array_descriptor - field->type), | |
715 | field->type, field->name, | |
716 | array_descriptor, field->offset, | |
717 | field->size, !!field->is_signed); | |
8728fe50 | 718 | |
2a37a3df SR |
719 | return 0; |
720 | } | |
5a65e956 | 721 | |
2a37a3df SR |
722 | static void f_stop(struct seq_file *m, void *p) |
723 | { | |
724 | } | |
981d081e | 725 | |
2a37a3df SR |
726 | static const struct seq_operations trace_format_seq_ops = { |
727 | .start = f_start, | |
728 | .next = f_next, | |
729 | .stop = f_stop, | |
730 | .show = f_show, | |
731 | }; | |
732 | ||
733 | static int trace_format_open(struct inode *inode, struct file *file) | |
734 | { | |
735 | struct ftrace_event_call *call = inode->i_private; | |
736 | struct seq_file *m; | |
737 | int ret; | |
738 | ||
739 | ret = seq_open(file, &trace_format_seq_ops); | |
740 | if (ret < 0) | |
741 | return ret; | |
742 | ||
743 | m = file->private_data; | |
744 | m->private = call; | |
745 | ||
746 | return 0; | |
981d081e SR |
747 | } |
748 | ||
23725aee PZ |
749 | static ssize_t |
750 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
751 | { | |
752 | struct ftrace_event_call *call = filp->private_data; | |
753 | struct trace_seq *s; | |
754 | int r; | |
755 | ||
756 | if (*ppos) | |
757 | return 0; | |
758 | ||
759 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
760 | if (!s) | |
761 | return -ENOMEM; | |
762 | ||
763 | trace_seq_init(s); | |
32c0edae | 764 | trace_seq_printf(s, "%d\n", call->event.type); |
23725aee PZ |
765 | |
766 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
767 | s->buffer, s->len); | |
768 | kfree(s); | |
769 | return r; | |
770 | } | |
771 | ||
7ce7e424 TZ |
772 | static ssize_t |
773 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
774 | loff_t *ppos) | |
775 | { | |
776 | struct ftrace_event_call *call = filp->private_data; | |
777 | struct trace_seq *s; | |
778 | int r; | |
779 | ||
780 | if (*ppos) | |
781 | return 0; | |
782 | ||
783 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
784 | if (!s) | |
785 | return -ENOMEM; | |
786 | ||
787 | trace_seq_init(s); | |
788 | ||
8b372562 | 789 | print_event_filter(call, s); |
4bda2d51 | 790 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
791 | |
792 | kfree(s); | |
793 | ||
794 | return r; | |
795 | } | |
796 | ||
797 | static ssize_t | |
798 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
799 | loff_t *ppos) | |
800 | { | |
801 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 802 | char *buf; |
7ce7e424 TZ |
803 | int err; |
804 | ||
8b372562 | 805 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
806 | return -EINVAL; |
807 | ||
8b372562 TZ |
808 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
809 | if (!buf) | |
7ce7e424 TZ |
810 | return -ENOMEM; |
811 | ||
8b372562 TZ |
812 | if (copy_from_user(buf, ubuf, cnt)) { |
813 | free_page((unsigned long) buf); | |
814 | return -EFAULT; | |
7ce7e424 | 815 | } |
8b372562 | 816 | buf[cnt] = '\0'; |
7ce7e424 | 817 | |
8b372562 TZ |
818 | err = apply_event_filter(call, buf); |
819 | free_page((unsigned long) buf); | |
820 | if (err < 0) | |
44e9c8b7 | 821 | return err; |
0a19e53c | 822 | |
7ce7e424 TZ |
823 | *ppos += cnt; |
824 | ||
825 | return cnt; | |
826 | } | |
827 | ||
cfb180f3 TZ |
828 | static ssize_t |
829 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
830 | loff_t *ppos) | |
831 | { | |
832 | struct event_subsystem *system = filp->private_data; | |
833 | struct trace_seq *s; | |
834 | int r; | |
835 | ||
836 | if (*ppos) | |
837 | return 0; | |
838 | ||
839 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
840 | if (!s) | |
841 | return -ENOMEM; | |
842 | ||
843 | trace_seq_init(s); | |
844 | ||
8b372562 | 845 | print_subsystem_event_filter(system, s); |
4bda2d51 | 846 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
847 | |
848 | kfree(s); | |
849 | ||
850 | return r; | |
851 | } | |
852 | ||
853 | static ssize_t | |
854 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
855 | loff_t *ppos) | |
856 | { | |
857 | struct event_subsystem *system = filp->private_data; | |
8b372562 | 858 | char *buf; |
cfb180f3 TZ |
859 | int err; |
860 | ||
8b372562 | 861 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
862 | return -EINVAL; |
863 | ||
8b372562 TZ |
864 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
865 | if (!buf) | |
cfb180f3 TZ |
866 | return -ENOMEM; |
867 | ||
8b372562 TZ |
868 | if (copy_from_user(buf, ubuf, cnt)) { |
869 | free_page((unsigned long) buf); | |
870 | return -EFAULT; | |
cfb180f3 | 871 | } |
8b372562 | 872 | buf[cnt] = '\0'; |
cfb180f3 | 873 | |
8b372562 TZ |
874 | err = apply_subsystem_event_filter(system, buf); |
875 | free_page((unsigned long) buf); | |
876 | if (err < 0) | |
44e9c8b7 | 877 | return err; |
cfb180f3 TZ |
878 | |
879 | *ppos += cnt; | |
880 | ||
881 | return cnt; | |
882 | } | |
883 | ||
d1b182a8 SR |
884 | static ssize_t |
885 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
886 | { | |
887 | int (*func)(struct trace_seq *s) = filp->private_data; | |
888 | struct trace_seq *s; | |
889 | int r; | |
890 | ||
891 | if (*ppos) | |
892 | return 0; | |
893 | ||
894 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
895 | if (!s) | |
896 | return -ENOMEM; | |
897 | ||
898 | trace_seq_init(s); | |
899 | ||
900 | func(s); | |
901 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
902 | ||
903 | kfree(s); | |
904 | ||
905 | return r; | |
906 | } | |
907 | ||
b77e38aa SR |
908 | static const struct seq_operations show_event_seq_ops = { |
909 | .start = t_start, | |
910 | .next = t_next, | |
911 | .show = t_show, | |
912 | .stop = t_stop, | |
913 | }; | |
914 | ||
915 | static const struct seq_operations show_set_event_seq_ops = { | |
916 | .start = s_start, | |
917 | .next = s_next, | |
918 | .show = t_show, | |
919 | .stop = t_stop, | |
920 | }; | |
921 | ||
2314c4ae SR |
922 | static const struct file_operations ftrace_avail_fops = { |
923 | .open = ftrace_event_seq_open, | |
924 | .read = seq_read, | |
925 | .llseek = seq_lseek, | |
926 | .release = seq_release, | |
927 | }; | |
928 | ||
b77e38aa SR |
929 | static const struct file_operations ftrace_set_event_fops = { |
930 | .open = ftrace_event_seq_open, | |
931 | .read = seq_read, | |
932 | .write = ftrace_event_write, | |
933 | .llseek = seq_lseek, | |
934 | .release = seq_release, | |
935 | }; | |
936 | ||
1473e441 SR |
937 | static const struct file_operations ftrace_enable_fops = { |
938 | .open = tracing_open_generic, | |
939 | .read = event_enable_read, | |
940 | .write = event_enable_write, | |
6038f373 | 941 | .llseek = default_llseek, |
1473e441 SR |
942 | }; |
943 | ||
981d081e | 944 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
945 | .open = trace_format_open, |
946 | .read = seq_read, | |
947 | .llseek = seq_lseek, | |
948 | .release = seq_release, | |
981d081e SR |
949 | }; |
950 | ||
23725aee PZ |
951 | static const struct file_operations ftrace_event_id_fops = { |
952 | .open = tracing_open_generic, | |
953 | .read = event_id_read, | |
6038f373 | 954 | .llseek = default_llseek, |
23725aee PZ |
955 | }; |
956 | ||
7ce7e424 TZ |
957 | static const struct file_operations ftrace_event_filter_fops = { |
958 | .open = tracing_open_generic, | |
959 | .read = event_filter_read, | |
960 | .write = event_filter_write, | |
6038f373 | 961 | .llseek = default_llseek, |
7ce7e424 TZ |
962 | }; |
963 | ||
cfb180f3 TZ |
964 | static const struct file_operations ftrace_subsystem_filter_fops = { |
965 | .open = tracing_open_generic, | |
966 | .read = subsystem_filter_read, | |
967 | .write = subsystem_filter_write, | |
6038f373 | 968 | .llseek = default_llseek, |
cfb180f3 TZ |
969 | }; |
970 | ||
8ae79a13 SR |
971 | static const struct file_operations ftrace_system_enable_fops = { |
972 | .open = tracing_open_generic, | |
973 | .read = system_enable_read, | |
974 | .write = system_enable_write, | |
6038f373 | 975 | .llseek = default_llseek, |
8ae79a13 SR |
976 | }; |
977 | ||
d1b182a8 SR |
978 | static const struct file_operations ftrace_show_header_fops = { |
979 | .open = tracing_open_generic, | |
980 | .read = show_header, | |
6038f373 | 981 | .llseek = default_llseek, |
d1b182a8 SR |
982 | }; |
983 | ||
1473e441 SR |
984 | static struct dentry *event_trace_events_dir(void) |
985 | { | |
986 | static struct dentry *d_tracer; | |
987 | static struct dentry *d_events; | |
988 | ||
989 | if (d_events) | |
990 | return d_events; | |
991 | ||
992 | d_tracer = tracing_init_dentry(); | |
993 | if (!d_tracer) | |
994 | return NULL; | |
995 | ||
996 | d_events = debugfs_create_dir("events", d_tracer); | |
997 | if (!d_events) | |
998 | pr_warning("Could not create debugfs " | |
999 | "'events' directory\n"); | |
1000 | ||
1001 | return d_events; | |
1002 | } | |
1003 | ||
6ecc2d1c SR |
1004 | static LIST_HEAD(event_subsystems); |
1005 | ||
1006 | static struct dentry * | |
1007 | event_subsystem_dir(const char *name, struct dentry *d_events) | |
1008 | { | |
1009 | struct event_subsystem *system; | |
e1112b4d | 1010 | struct dentry *entry; |
6ecc2d1c SR |
1011 | |
1012 | /* First see if we did not already create this dir */ | |
1013 | list_for_each_entry(system, &event_subsystems, list) { | |
dc82ec98 XG |
1014 | if (strcmp(system->name, name) == 0) { |
1015 | system->nr_events++; | |
6ecc2d1c | 1016 | return system->entry; |
dc82ec98 | 1017 | } |
6ecc2d1c SR |
1018 | } |
1019 | ||
1020 | /* need to create new entry */ | |
1021 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1022 | if (!system) { | |
1023 | pr_warning("No memory to create event subsystem %s\n", | |
1024 | name); | |
1025 | return d_events; | |
1026 | } | |
1027 | ||
1028 | system->entry = debugfs_create_dir(name, d_events); | |
1029 | if (!system->entry) { | |
1030 | pr_warning("Could not create event subsystem %s\n", | |
1031 | name); | |
1032 | kfree(system); | |
1033 | return d_events; | |
1034 | } | |
1035 | ||
dc82ec98 | 1036 | system->nr_events = 1; |
6d723736 SR |
1037 | system->name = kstrdup(name, GFP_KERNEL); |
1038 | if (!system->name) { | |
1039 | debugfs_remove(system->entry); | |
1040 | kfree(system); | |
1041 | return d_events; | |
1042 | } | |
1043 | ||
6ecc2d1c SR |
1044 | list_add(&system->list, &event_subsystems); |
1045 | ||
30e673b2 | 1046 | system->filter = NULL; |
cfb180f3 | 1047 | |
8b372562 TZ |
1048 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
1049 | if (!system->filter) { | |
1050 | pr_warning("Could not allocate filter for subsystem " | |
1051 | "'%s'\n", name); | |
1052 | return system->entry; | |
1053 | } | |
1054 | ||
e1112b4d TZ |
1055 | entry = debugfs_create_file("filter", 0644, system->entry, system, |
1056 | &ftrace_subsystem_filter_fops); | |
8b372562 TZ |
1057 | if (!entry) { |
1058 | kfree(system->filter); | |
1059 | system->filter = NULL; | |
e1112b4d TZ |
1060 | pr_warning("Could not create debugfs " |
1061 | "'%s/filter' entry\n", name); | |
8b372562 | 1062 | } |
e1112b4d | 1063 | |
f3f3f009 FW |
1064 | trace_create_file("enable", 0644, system->entry, |
1065 | (void *)system->name, | |
1066 | &ftrace_system_enable_fops); | |
8ae79a13 | 1067 | |
6ecc2d1c SR |
1068 | return system->entry; |
1069 | } | |
1070 | ||
1473e441 | 1071 | static int |
701970b3 SR |
1072 | event_create_dir(struct ftrace_event_call *call, struct dentry *d_events, |
1073 | const struct file_operations *id, | |
1074 | const struct file_operations *enable, | |
1075 | const struct file_operations *filter, | |
1076 | const struct file_operations *format) | |
1473e441 | 1077 | { |
2e33af02 | 1078 | struct list_head *head; |
fd994989 | 1079 | int ret; |
1473e441 | 1080 | |
6ecc2d1c SR |
1081 | /* |
1082 | * If the trace point header did not define TRACE_SYSTEM | |
1083 | * then the system would be called "TRACE_SYSTEM". | |
1084 | */ | |
8f082018 SR |
1085 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
1086 | d_events = event_subsystem_dir(call->class->system, d_events); | |
6ecc2d1c | 1087 | |
1473e441 SR |
1088 | call->dir = debugfs_create_dir(call->name, d_events); |
1089 | if (!call->dir) { | |
1090 | pr_warning("Could not create debugfs " | |
1091 | "'%s' directory\n", call->name); | |
1092 | return -1; | |
1093 | } | |
1094 | ||
a1d0ce82 | 1095 | if (call->class->reg) |
f3f3f009 FW |
1096 | trace_create_file("enable", 0644, call->dir, call, |
1097 | enable); | |
1473e441 | 1098 | |
2239291a | 1099 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 1100 | if (call->event.type && call->class->reg) |
f3f3f009 FW |
1101 | trace_create_file("id", 0444, call->dir, call, |
1102 | id); | |
2239291a | 1103 | #endif |
23725aee | 1104 | |
c9d932cf LZ |
1105 | /* |
1106 | * Other events may have the same class. Only update | |
1107 | * the fields if they are not already defined. | |
1108 | */ | |
1109 | head = trace_get_fields(call); | |
1110 | if (list_empty(head)) { | |
1111 | ret = call->class->define_fields(call); | |
1112 | if (ret < 0) { | |
1113 | pr_warning("Could not initialize trace point" | |
1114 | " events/%s\n", call->name); | |
1115 | return ret; | |
cf027f64 TZ |
1116 | } |
1117 | } | |
c9d932cf LZ |
1118 | trace_create_file("filter", 0644, call->dir, call, |
1119 | filter); | |
cf027f64 | 1120 | |
f3f3f009 FW |
1121 | trace_create_file("format", 0444, call->dir, call, |
1122 | format); | |
6d723736 SR |
1123 | |
1124 | return 0; | |
1125 | } | |
1126 | ||
67ead0a6 LZ |
1127 | static int |
1128 | __trace_add_event_call(struct ftrace_event_call *call, struct module *mod, | |
1129 | const struct file_operations *id, | |
1130 | const struct file_operations *enable, | |
1131 | const struct file_operations *filter, | |
1132 | const struct file_operations *format) | |
bd1a5c84 MH |
1133 | { |
1134 | struct dentry *d_events; | |
1135 | int ret; | |
6d723736 | 1136 | |
67ead0a6 | 1137 | /* The linker may leave blanks */ |
bd1a5c84 MH |
1138 | if (!call->name) |
1139 | return -EINVAL; | |
701970b3 | 1140 | |
0405ab80 SR |
1141 | if (call->class->raw_init) { |
1142 | ret = call->class->raw_init(call); | |
bd1a5c84 MH |
1143 | if (ret < 0) { |
1144 | if (ret != -ENOSYS) | |
67ead0a6 LZ |
1145 | pr_warning("Could not initialize trace events/%s\n", |
1146 | call->name); | |
bd1a5c84 MH |
1147 | return ret; |
1148 | } | |
1149 | } | |
701970b3 | 1150 | |
bd1a5c84 MH |
1151 | d_events = event_trace_events_dir(); |
1152 | if (!d_events) | |
1153 | return -ENOENT; | |
1154 | ||
67ead0a6 | 1155 | ret = event_create_dir(call, d_events, id, enable, filter, format); |
88f70d75 MH |
1156 | if (!ret) |
1157 | list_add(&call->list, &ftrace_events); | |
67ead0a6 | 1158 | call->mod = mod; |
88f70d75 | 1159 | |
588bebb7 | 1160 | return ret; |
bd1a5c84 MH |
1161 | } |
1162 | ||
1163 | /* Add an additional event_call dynamically */ | |
1164 | int trace_add_event_call(struct ftrace_event_call *call) | |
1165 | { | |
1166 | int ret; | |
1167 | mutex_lock(&event_mutex); | |
67ead0a6 LZ |
1168 | ret = __trace_add_event_call(call, NULL, &ftrace_event_id_fops, |
1169 | &ftrace_enable_fops, | |
1170 | &ftrace_event_filter_fops, | |
1171 | &ftrace_event_format_fops); | |
bd1a5c84 MH |
1172 | mutex_unlock(&event_mutex); |
1173 | return ret; | |
1174 | } | |
701970b3 | 1175 | |
a2ca5e03 FW |
1176 | static void remove_subsystem_dir(const char *name) |
1177 | { | |
1178 | struct event_subsystem *system; | |
1179 | ||
1180 | if (strcmp(name, TRACE_SYSTEM) == 0) | |
1181 | return; | |
1182 | ||
1183 | list_for_each_entry(system, &event_subsystems, list) { | |
1184 | if (strcmp(system->name, name) == 0) { | |
1185 | if (!--system->nr_events) { | |
1186 | struct event_filter *filter = system->filter; | |
1187 | ||
1188 | debugfs_remove_recursive(system->entry); | |
1189 | list_del(&system->list); | |
1190 | if (filter) { | |
1191 | kfree(filter->filter_string); | |
1192 | kfree(filter); | |
1193 | } | |
1194 | kfree(system->name); | |
1195 | kfree(system); | |
1196 | } | |
1197 | break; | |
1198 | } | |
1199 | } | |
1200 | } | |
1201 | ||
4fead8e4 MH |
1202 | /* |
1203 | * Must be called under locking both of event_mutex and trace_event_mutex. | |
1204 | */ | |
bd1a5c84 MH |
1205 | static void __trace_remove_event_call(struct ftrace_event_call *call) |
1206 | { | |
1207 | ftrace_event_enable_disable(call, 0); | |
80decc70 SR |
1208 | if (call->event.funcs) |
1209 | __unregister_ftrace_event(&call->event); | |
bd1a5c84 MH |
1210 | debugfs_remove_recursive(call->dir); |
1211 | list_del(&call->list); | |
1212 | trace_destroy_fields(call); | |
1213 | destroy_preds(call); | |
8f082018 | 1214 | remove_subsystem_dir(call->class->system); |
bd1a5c84 MH |
1215 | } |
1216 | ||
1217 | /* Remove an event_call */ | |
1218 | void trace_remove_event_call(struct ftrace_event_call *call) | |
1219 | { | |
1220 | mutex_lock(&event_mutex); | |
4fead8e4 | 1221 | down_write(&trace_event_mutex); |
bd1a5c84 | 1222 | __trace_remove_event_call(call); |
4fead8e4 | 1223 | up_write(&trace_event_mutex); |
bd1a5c84 MH |
1224 | mutex_unlock(&event_mutex); |
1225 | } | |
1226 | ||
1227 | #define for_each_event(event, start, end) \ | |
1228 | for (event = start; \ | |
1229 | (unsigned long)event < (unsigned long)end; \ | |
1230 | event++) | |
1231 | ||
1232 | #ifdef CONFIG_MODULES | |
1233 | ||
1234 | static LIST_HEAD(ftrace_module_file_list); | |
1235 | ||
1236 | /* | |
1237 | * Modules must own their file_operations to keep up with | |
1238 | * reference counting. | |
1239 | */ | |
1240 | struct ftrace_module_file_ops { | |
1241 | struct list_head list; | |
1242 | struct module *mod; | |
1243 | struct file_operations id; | |
1244 | struct file_operations enable; | |
1245 | struct file_operations format; | |
1246 | struct file_operations filter; | |
1247 | }; | |
1248 | ||
701970b3 SR |
1249 | static struct ftrace_module_file_ops * |
1250 | trace_create_file_ops(struct module *mod) | |
1251 | { | |
1252 | struct ftrace_module_file_ops *file_ops; | |
1253 | ||
1254 | /* | |
1255 | * This is a bit of a PITA. To allow for correct reference | |
1256 | * counting, modules must "own" their file_operations. | |
1257 | * To do this, we allocate the file operations that will be | |
1258 | * used in the event directory. | |
1259 | */ | |
1260 | ||
1261 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1262 | if (!file_ops) | |
1263 | return NULL; | |
1264 | ||
1265 | file_ops->mod = mod; | |
1266 | ||
1267 | file_ops->id = ftrace_event_id_fops; | |
1268 | file_ops->id.owner = mod; | |
1269 | ||
1270 | file_ops->enable = ftrace_enable_fops; | |
1271 | file_ops->enable.owner = mod; | |
1272 | ||
1273 | file_ops->filter = ftrace_event_filter_fops; | |
1274 | file_ops->filter.owner = mod; | |
1275 | ||
1276 | file_ops->format = ftrace_event_format_fops; | |
1277 | file_ops->format.owner = mod; | |
1278 | ||
1279 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1280 | ||
1281 | return file_ops; | |
1282 | } | |
1283 | ||
6d723736 SR |
1284 | static void trace_module_add_events(struct module *mod) |
1285 | { | |
701970b3 | 1286 | struct ftrace_module_file_ops *file_ops = NULL; |
e4a9ea5e | 1287 | struct ftrace_event_call **call, **start, **end; |
6d723736 SR |
1288 | |
1289 | start = mod->trace_events; | |
1290 | end = mod->trace_events + mod->num_trace_events; | |
1291 | ||
1292 | if (start == end) | |
1293 | return; | |
1294 | ||
67ead0a6 LZ |
1295 | file_ops = trace_create_file_ops(mod); |
1296 | if (!file_ops) | |
6d723736 SR |
1297 | return; |
1298 | ||
1299 | for_each_event(call, start, end) { | |
e4a9ea5e | 1300 | __trace_add_event_call(*call, mod, |
88f70d75 MH |
1301 | &file_ops->id, &file_ops->enable, |
1302 | &file_ops->filter, &file_ops->format); | |
6d723736 SR |
1303 | } |
1304 | } | |
1305 | ||
1306 | static void trace_module_remove_events(struct module *mod) | |
1307 | { | |
701970b3 | 1308 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1309 | struct ftrace_event_call *call, *p; |
9456f0fa | 1310 | bool found = false; |
6d723736 | 1311 | |
110bf2b7 | 1312 | down_write(&trace_event_mutex); |
6d723736 SR |
1313 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1314 | if (call->mod == mod) { | |
9456f0fa | 1315 | found = true; |
bd1a5c84 | 1316 | __trace_remove_event_call(call); |
6d723736 SR |
1317 | } |
1318 | } | |
701970b3 SR |
1319 | |
1320 | /* Now free the file_operations */ | |
1321 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1322 | if (file_ops->mod == mod) | |
1323 | break; | |
1324 | } | |
1325 | if (&file_ops->list != &ftrace_module_file_list) { | |
1326 | list_del(&file_ops->list); | |
1327 | kfree(file_ops); | |
1328 | } | |
9456f0fa SR |
1329 | |
1330 | /* | |
1331 | * It is safest to reset the ring buffer if the module being unloaded | |
1332 | * registered any events. | |
1333 | */ | |
1334 | if (found) | |
1335 | tracing_reset_current_online_cpus(); | |
110bf2b7 | 1336 | up_write(&trace_event_mutex); |
6d723736 SR |
1337 | } |
1338 | ||
61f919a1 SR |
1339 | static int trace_module_notify(struct notifier_block *self, |
1340 | unsigned long val, void *data) | |
6d723736 SR |
1341 | { |
1342 | struct module *mod = data; | |
1343 | ||
1344 | mutex_lock(&event_mutex); | |
1345 | switch (val) { | |
1346 | case MODULE_STATE_COMING: | |
1347 | trace_module_add_events(mod); | |
1348 | break; | |
1349 | case MODULE_STATE_GOING: | |
1350 | trace_module_remove_events(mod); | |
1351 | break; | |
1352 | } | |
1353 | mutex_unlock(&event_mutex); | |
fd994989 | 1354 | |
1473e441 SR |
1355 | return 0; |
1356 | } | |
61f919a1 SR |
1357 | #else |
1358 | static int trace_module_notify(struct notifier_block *self, | |
1359 | unsigned long val, void *data) | |
1360 | { | |
1361 | return 0; | |
1362 | } | |
1363 | #endif /* CONFIG_MODULES */ | |
1473e441 | 1364 | |
ec827c7e | 1365 | static struct notifier_block trace_module_nb = { |
6d723736 SR |
1366 | .notifier_call = trace_module_notify, |
1367 | .priority = 0, | |
1368 | }; | |
1369 | ||
e4a9ea5e SR |
1370 | extern struct ftrace_event_call *__start_ftrace_events[]; |
1371 | extern struct ftrace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 1372 | |
020e5f85 LZ |
1373 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
1374 | ||
1375 | static __init int setup_trace_event(char *str) | |
1376 | { | |
1377 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
1378 | ring_buffer_expanded = 1; | |
1379 | tracing_selftest_disabled = 1; | |
1380 | ||
1381 | return 1; | |
1382 | } | |
1383 | __setup("trace_event=", setup_trace_event); | |
1384 | ||
b77e38aa SR |
1385 | static __init int event_trace_init(void) |
1386 | { | |
e4a9ea5e | 1387 | struct ftrace_event_call **call; |
b77e38aa SR |
1388 | struct dentry *d_tracer; |
1389 | struct dentry *entry; | |
1473e441 | 1390 | struct dentry *d_events; |
6d723736 | 1391 | int ret; |
020e5f85 LZ |
1392 | char *buf = bootup_event_buf; |
1393 | char *token; | |
b77e38aa SR |
1394 | |
1395 | d_tracer = tracing_init_dentry(); | |
1396 | if (!d_tracer) | |
1397 | return 0; | |
1398 | ||
2314c4ae SR |
1399 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
1400 | (void *)&show_event_seq_ops, | |
1401 | &ftrace_avail_fops); | |
1402 | if (!entry) | |
1403 | pr_warning("Could not create debugfs " | |
1404 | "'available_events' entry\n"); | |
1405 | ||
b77e38aa SR |
1406 | entry = debugfs_create_file("set_event", 0644, d_tracer, |
1407 | (void *)&show_set_event_seq_ops, | |
1408 | &ftrace_set_event_fops); | |
1409 | if (!entry) | |
1410 | pr_warning("Could not create debugfs " | |
1411 | "'set_event' entry\n"); | |
1412 | ||
1473e441 SR |
1413 | d_events = event_trace_events_dir(); |
1414 | if (!d_events) | |
1415 | return 0; | |
1416 | ||
d1b182a8 SR |
1417 | /* ring buffer internal formats */ |
1418 | trace_create_file("header_page", 0444, d_events, | |
1419 | ring_buffer_print_page_header, | |
1420 | &ftrace_show_header_fops); | |
1421 | ||
1422 | trace_create_file("header_event", 0444, d_events, | |
1423 | ring_buffer_print_entry_header, | |
1424 | &ftrace_show_header_fops); | |
1425 | ||
8ae79a13 | 1426 | trace_create_file("enable", 0644, d_events, |
8f31bfe5 | 1427 | NULL, &ftrace_system_enable_fops); |
8ae79a13 | 1428 | |
8728fe50 LZ |
1429 | if (trace_define_common_fields()) |
1430 | pr_warning("tracing: Failed to allocate common fields"); | |
1431 | ||
6d723736 | 1432 | for_each_event(call, __start_ftrace_events, __stop_ftrace_events) { |
e4a9ea5e | 1433 | __trace_add_event_call(*call, NULL, &ftrace_event_id_fops, |
88f70d75 MH |
1434 | &ftrace_enable_fops, |
1435 | &ftrace_event_filter_fops, | |
1436 | &ftrace_event_format_fops); | |
1473e441 SR |
1437 | } |
1438 | ||
020e5f85 LZ |
1439 | while (true) { |
1440 | token = strsep(&buf, ","); | |
1441 | ||
1442 | if (!token) | |
1443 | break; | |
1444 | if (!*token) | |
1445 | continue; | |
1446 | ||
1447 | ret = ftrace_set_clr_event(token, 1); | |
1448 | if (ret) | |
1449 | pr_warning("Failed to enable trace event: %s\n", token); | |
1450 | } | |
1451 | ||
6d723736 | 1452 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 1453 | if (ret) |
6d723736 SR |
1454 | pr_warning("Failed to register trace events module notifier\n"); |
1455 | ||
b77e38aa SR |
1456 | return 0; |
1457 | } | |
1458 | fs_initcall(event_trace_init); | |
e6187007 SR |
1459 | |
1460 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1461 | ||
1462 | static DEFINE_SPINLOCK(test_spinlock); | |
1463 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
1464 | static DEFINE_MUTEX(test_mutex); | |
1465 | ||
1466 | static __init void test_work(struct work_struct *dummy) | |
1467 | { | |
1468 | spin_lock(&test_spinlock); | |
1469 | spin_lock_irq(&test_spinlock_irq); | |
1470 | udelay(1); | |
1471 | spin_unlock_irq(&test_spinlock_irq); | |
1472 | spin_unlock(&test_spinlock); | |
1473 | ||
1474 | mutex_lock(&test_mutex); | |
1475 | msleep(1); | |
1476 | mutex_unlock(&test_mutex); | |
1477 | } | |
1478 | ||
1479 | static __init int event_test_thread(void *unused) | |
1480 | { | |
1481 | void *test_malloc; | |
1482 | ||
1483 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
1484 | if (!test_malloc) | |
1485 | pr_info("failed to kmalloc\n"); | |
1486 | ||
1487 | schedule_on_each_cpu(test_work); | |
1488 | ||
1489 | kfree(test_malloc); | |
1490 | ||
1491 | set_current_state(TASK_INTERRUPTIBLE); | |
1492 | while (!kthread_should_stop()) | |
1493 | schedule(); | |
1494 | ||
1495 | return 0; | |
1496 | } | |
1497 | ||
1498 | /* | |
1499 | * Do various things that may trigger events. | |
1500 | */ | |
1501 | static __init void event_test_stuff(void) | |
1502 | { | |
1503 | struct task_struct *test_thread; | |
1504 | ||
1505 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
1506 | msleep(1); | |
1507 | kthread_stop(test_thread); | |
1508 | } | |
1509 | ||
1510 | /* | |
1511 | * For every trace event defined, we will test each trace point separately, | |
1512 | * and then by groups, and finally all trace points. | |
1513 | */ | |
9ea21c1e | 1514 | static __init void event_trace_self_tests(void) |
e6187007 SR |
1515 | { |
1516 | struct ftrace_event_call *call; | |
1517 | struct event_subsystem *system; | |
e6187007 SR |
1518 | int ret; |
1519 | ||
1520 | pr_info("Running tests on trace events:\n"); | |
1521 | ||
1522 | list_for_each_entry(call, &ftrace_events, list) { | |
1523 | ||
2239291a SR |
1524 | /* Only test those that have a probe */ |
1525 | if (!call->class || !call->class->probe) | |
e6187007 SR |
1526 | continue; |
1527 | ||
1f5a6b45 SR |
1528 | /* |
1529 | * Testing syscall events here is pretty useless, but | |
1530 | * we still do it if configured. But this is time consuming. | |
1531 | * What we really need is a user thread to perform the | |
1532 | * syscalls as we test. | |
1533 | */ | |
1534 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
1535 | if (call->class->system && |
1536 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
1537 | continue; |
1538 | #endif | |
1539 | ||
e6187007 SR |
1540 | pr_info("Testing event %s: ", call->name); |
1541 | ||
1542 | /* | |
1543 | * If an event is already enabled, someone is using | |
1544 | * it and the self test should not be on. | |
1545 | */ | |
553552ce | 1546 | if (call->flags & TRACE_EVENT_FL_ENABLED) { |
e6187007 SR |
1547 | pr_warning("Enabled event during self test!\n"); |
1548 | WARN_ON_ONCE(1); | |
1549 | continue; | |
1550 | } | |
1551 | ||
0e907c99 | 1552 | ftrace_event_enable_disable(call, 1); |
e6187007 | 1553 | event_test_stuff(); |
0e907c99 | 1554 | ftrace_event_enable_disable(call, 0); |
e6187007 SR |
1555 | |
1556 | pr_cont("OK\n"); | |
1557 | } | |
1558 | ||
1559 | /* Now test at the sub system level */ | |
1560 | ||
1561 | pr_info("Running tests on trace event systems:\n"); | |
1562 | ||
1563 | list_for_each_entry(system, &event_subsystems, list) { | |
1564 | ||
1565 | /* the ftrace system is special, skip it */ | |
1566 | if (strcmp(system->name, "ftrace") == 0) | |
1567 | continue; | |
1568 | ||
1569 | pr_info("Testing event system %s: ", system->name); | |
1570 | ||
8f31bfe5 | 1571 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1); |
e6187007 SR |
1572 | if (WARN_ON_ONCE(ret)) { |
1573 | pr_warning("error enabling system %s\n", | |
1574 | system->name); | |
1575 | continue; | |
1576 | } | |
1577 | ||
1578 | event_test_stuff(); | |
1579 | ||
8f31bfe5 | 1580 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0); |
e6187007 SR |
1581 | if (WARN_ON_ONCE(ret)) |
1582 | pr_warning("error disabling system %s\n", | |
1583 | system->name); | |
1584 | ||
1585 | pr_cont("OK\n"); | |
1586 | } | |
1587 | ||
1588 | /* Test with all events enabled */ | |
1589 | ||
1590 | pr_info("Running tests on all trace events:\n"); | |
1591 | pr_info("Testing all events: "); | |
1592 | ||
8f31bfe5 | 1593 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1); |
e6187007 | 1594 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 1595 | pr_warning("error enabling all events\n"); |
9ea21c1e | 1596 | return; |
e6187007 SR |
1597 | } |
1598 | ||
1599 | event_test_stuff(); | |
1600 | ||
1601 | /* reset sysname */ | |
8f31bfe5 | 1602 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0); |
e6187007 SR |
1603 | if (WARN_ON_ONCE(ret)) { |
1604 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 1605 | return; |
e6187007 SR |
1606 | } |
1607 | ||
1608 | pr_cont("OK\n"); | |
9ea21c1e SR |
1609 | } |
1610 | ||
1611 | #ifdef CONFIG_FUNCTION_TRACER | |
1612 | ||
245b2e70 | 1613 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e SR |
1614 | |
1615 | static void | |
1616 | function_test_events_call(unsigned long ip, unsigned long parent_ip) | |
1617 | { | |
1618 | struct ring_buffer_event *event; | |
e77405ad | 1619 | struct ring_buffer *buffer; |
9ea21c1e SR |
1620 | struct ftrace_entry *entry; |
1621 | unsigned long flags; | |
1622 | long disabled; | |
9ea21c1e SR |
1623 | int cpu; |
1624 | int pc; | |
1625 | ||
1626 | pc = preempt_count(); | |
5168ae50 | 1627 | preempt_disable_notrace(); |
9ea21c1e | 1628 | cpu = raw_smp_processor_id(); |
245b2e70 | 1629 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
1630 | |
1631 | if (disabled != 1) | |
1632 | goto out; | |
1633 | ||
1634 | local_save_flags(flags); | |
1635 | ||
e77405ad SR |
1636 | event = trace_current_buffer_lock_reserve(&buffer, |
1637 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
1638 | flags, pc); |
1639 | if (!event) | |
1640 | goto out; | |
1641 | entry = ring_buffer_event_data(event); | |
1642 | entry->ip = ip; | |
1643 | entry->parent_ip = parent_ip; | |
1644 | ||
e77405ad | 1645 | trace_nowake_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
1646 | |
1647 | out: | |
245b2e70 | 1648 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 1649 | preempt_enable_notrace(); |
9ea21c1e SR |
1650 | } |
1651 | ||
1652 | static struct ftrace_ops trace_ops __initdata = | |
1653 | { | |
1654 | .func = function_test_events_call, | |
1655 | }; | |
1656 | ||
1657 | static __init void event_trace_self_test_with_function(void) | |
1658 | { | |
1659 | register_ftrace_function(&trace_ops); | |
1660 | pr_info("Running tests again, along with the function tracer\n"); | |
1661 | event_trace_self_tests(); | |
1662 | unregister_ftrace_function(&trace_ops); | |
1663 | } | |
1664 | #else | |
1665 | static __init void event_trace_self_test_with_function(void) | |
1666 | { | |
1667 | } | |
1668 | #endif | |
1669 | ||
1670 | static __init int event_trace_self_tests_init(void) | |
1671 | { | |
020e5f85 LZ |
1672 | if (!tracing_selftest_disabled) { |
1673 | event_trace_self_tests(); | |
1674 | event_trace_self_test_with_function(); | |
1675 | } | |
e6187007 SR |
1676 | |
1677 | return 0; | |
1678 | } | |
1679 | ||
28d20e2d | 1680 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
1681 | |
1682 | #endif |