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 | |
a59fd602 SR |
30 | LIST_HEAD(ftrace_events); |
31 | ||
2e33af02 SR |
32 | struct list_head * |
33 | trace_get_fields(struct ftrace_event_call *event_call) | |
34 | { | |
35 | if (!event_call->class->get_fields) | |
36 | return &event_call->class->fields; | |
37 | return event_call->class->get_fields(event_call); | |
38 | } | |
39 | ||
aeaeae11 FW |
40 | int trace_define_field(struct ftrace_event_call *call, const char *type, |
41 | const char *name, int offset, int size, int is_signed, | |
43b51ead | 42 | int filter_type) |
cf027f64 TZ |
43 | { |
44 | struct ftrace_event_field *field; | |
2e33af02 SR |
45 | struct list_head *head; |
46 | ||
47 | if (WARN_ON(!call->class)) | |
48 | return 0; | |
cf027f64 | 49 | |
fe9f57f2 | 50 | field = kzalloc(sizeof(*field), GFP_KERNEL); |
cf027f64 TZ |
51 | if (!field) |
52 | goto err; | |
fe9f57f2 | 53 | |
cf027f64 TZ |
54 | field->name = kstrdup(name, GFP_KERNEL); |
55 | if (!field->name) | |
56 | goto err; | |
fe9f57f2 | 57 | |
cf027f64 TZ |
58 | field->type = kstrdup(type, GFP_KERNEL); |
59 | if (!field->type) | |
60 | goto err; | |
fe9f57f2 | 61 | |
43b51ead LZ |
62 | if (filter_type == FILTER_OTHER) |
63 | field->filter_type = filter_assign_type(type); | |
64 | else | |
65 | field->filter_type = filter_type; | |
66 | ||
cf027f64 TZ |
67 | field->offset = offset; |
68 | field->size = size; | |
a118e4d1 | 69 | field->is_signed = is_signed; |
aa38e9fc | 70 | |
2e33af02 SR |
71 | head = trace_get_fields(call); |
72 | list_add(&field->link, head); | |
cf027f64 TZ |
73 | |
74 | return 0; | |
fe9f57f2 | 75 | |
cf027f64 | 76 | err: |
7b60997f | 77 | if (field) |
cf027f64 | 78 | kfree(field->name); |
cf027f64 | 79 | kfree(field); |
fe9f57f2 | 80 | |
cf027f64 TZ |
81 | return -ENOMEM; |
82 | } | |
17c873ec | 83 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 84 | |
e647d6b3 LZ |
85 | #define __common_field(type, item) \ |
86 | ret = trace_define_field(call, #type, "common_" #item, \ | |
87 | offsetof(typeof(ent), item), \ | |
88 | sizeof(ent.item), \ | |
43b51ead | 89 | is_signed_type(type), FILTER_OTHER); \ |
e647d6b3 LZ |
90 | if (ret) \ |
91 | return ret; | |
92 | ||
614a71a2 | 93 | static int trace_define_common_fields(struct ftrace_event_call *call) |
e647d6b3 LZ |
94 | { |
95 | int ret; | |
96 | struct trace_entry ent; | |
97 | ||
98 | __common_field(unsigned short, type); | |
99 | __common_field(unsigned char, flags); | |
100 | __common_field(unsigned char, preempt_count); | |
101 | __common_field(int, pid); | |
637e7e86 | 102 | __common_field(int, lock_depth); |
e647d6b3 LZ |
103 | |
104 | return ret; | |
105 | } | |
106 | ||
bd1a5c84 | 107 | void trace_destroy_fields(struct ftrace_event_call *call) |
2df75e41 LZ |
108 | { |
109 | struct ftrace_event_field *field, *next; | |
2e33af02 | 110 | struct list_head *head; |
2df75e41 | 111 | |
2e33af02 SR |
112 | head = trace_get_fields(call); |
113 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 LZ |
114 | list_del(&field->link); |
115 | kfree(field->type); | |
116 | kfree(field->name); | |
117 | kfree(field); | |
118 | } | |
119 | } | |
120 | ||
87d9b4e1 LZ |
121 | int trace_event_raw_init(struct ftrace_event_call *call) |
122 | { | |
123 | int id; | |
124 | ||
80decc70 | 125 | id = register_ftrace_event(&call->event); |
87d9b4e1 LZ |
126 | if (!id) |
127 | return -ENODEV; | |
128 | call->id = id; | |
87d9b4e1 LZ |
129 | |
130 | return 0; | |
131 | } | |
132 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
133 | ||
3b8e4273 | 134 | static int ftrace_event_enable_disable(struct ftrace_event_call *call, |
fd994989 SR |
135 | int enable) |
136 | { | |
3b8e4273 LZ |
137 | int ret = 0; |
138 | ||
fd994989 SR |
139 | switch (enable) { |
140 | case 0: | |
141 | if (call->enabled) { | |
142 | call->enabled = 0; | |
b11c53e1 | 143 | tracing_stop_cmdline_record(); |
2239291a SR |
144 | if (call->class->reg) |
145 | call->class->reg(call, TRACE_REG_UNREGISTER); | |
146 | else | |
147 | tracepoint_probe_unregister(call->name, | |
148 | call->class->probe, | |
149 | call); | |
fd994989 | 150 | } |
fd994989 SR |
151 | break; |
152 | case 1: | |
da4d0302 | 153 | if (!call->enabled) { |
b11c53e1 | 154 | tracing_start_cmdline_record(); |
2239291a SR |
155 | if (call->class->reg) |
156 | ret = call->class->reg(call, TRACE_REG_REGISTER); | |
157 | else | |
158 | ret = tracepoint_probe_register(call->name, | |
159 | call->class->probe, | |
160 | call); | |
3b8e4273 LZ |
161 | if (ret) { |
162 | tracing_stop_cmdline_record(); | |
163 | pr_info("event trace: Could not enable event " | |
164 | "%s\n", call->name); | |
165 | break; | |
166 | } | |
167 | call->enabled = 1; | |
fd994989 | 168 | } |
fd994989 SR |
169 | break; |
170 | } | |
3b8e4273 LZ |
171 | |
172 | return ret; | |
fd994989 SR |
173 | } |
174 | ||
0e907c99 Z |
175 | static void ftrace_clear_events(void) |
176 | { | |
177 | struct ftrace_event_call *call; | |
178 | ||
179 | mutex_lock(&event_mutex); | |
180 | list_for_each_entry(call, &ftrace_events, list) { | |
181 | ftrace_event_enable_disable(call, 0); | |
182 | } | |
183 | mutex_unlock(&event_mutex); | |
184 | } | |
185 | ||
8f31bfe5 LZ |
186 | /* |
187 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
188 | */ | |
189 | static int __ftrace_set_clr_event(const char *match, const char *sub, | |
190 | const char *event, int set) | |
b77e38aa | 191 | { |
a59fd602 | 192 | struct ftrace_event_call *call; |
29f93943 | 193 | int ret = -EINVAL; |
8f31bfe5 LZ |
194 | |
195 | mutex_lock(&event_mutex); | |
196 | list_for_each_entry(call, &ftrace_events, list) { | |
197 | ||
2239291a SR |
198 | if (!call->name || !call->class || |
199 | (!call->class->probe && !call->class->reg)) | |
8f31bfe5 LZ |
200 | continue; |
201 | ||
202 | if (match && | |
203 | strcmp(match, call->name) != 0 && | |
8f082018 | 204 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
205 | continue; |
206 | ||
8f082018 | 207 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
208 | continue; |
209 | ||
210 | if (event && strcmp(event, call->name) != 0) | |
211 | continue; | |
212 | ||
213 | ftrace_event_enable_disable(call, set); | |
214 | ||
215 | ret = 0; | |
216 | } | |
217 | mutex_unlock(&event_mutex); | |
218 | ||
219 | return ret; | |
220 | } | |
221 | ||
222 | static int ftrace_set_clr_event(char *buf, int set) | |
223 | { | |
b628b3e6 | 224 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
225 | |
226 | /* | |
227 | * The buf format can be <subsystem>:<event-name> | |
228 | * *:<event-name> means any event by that name. | |
229 | * :<event-name> is the same. | |
230 | * | |
231 | * <subsystem>:* means all events in that subsystem | |
232 | * <subsystem>: means the same. | |
233 | * | |
234 | * <name> (no ':') means all events in a subsystem with | |
235 | * the name <name> or any event that matches <name> | |
236 | */ | |
237 | ||
238 | match = strsep(&buf, ":"); | |
239 | if (buf) { | |
240 | sub = match; | |
241 | event = buf; | |
242 | match = NULL; | |
243 | ||
244 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
245 | sub = NULL; | |
246 | if (!strlen(event) || strcmp(event, "*") == 0) | |
247 | event = NULL; | |
248 | } | |
b77e38aa | 249 | |
8f31bfe5 | 250 | return __ftrace_set_clr_event(match, sub, event, set); |
b77e38aa SR |
251 | } |
252 | ||
4671c794 SR |
253 | /** |
254 | * trace_set_clr_event - enable or disable an event | |
255 | * @system: system name to match (NULL for any system) | |
256 | * @event: event name to match (NULL for all events, within system) | |
257 | * @set: 1 to enable, 0 to disable | |
258 | * | |
259 | * This is a way for other parts of the kernel to enable or disable | |
260 | * event recording. | |
261 | * | |
262 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
263 | * registered events. | |
264 | */ | |
265 | int trace_set_clr_event(const char *system, const char *event, int set) | |
266 | { | |
267 | return __ftrace_set_clr_event(NULL, system, event, set); | |
268 | } | |
269 | ||
b77e38aa SR |
270 | /* 128 should be much more than enough */ |
271 | #define EVENT_BUF_SIZE 127 | |
272 | ||
273 | static ssize_t | |
274 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
275 | size_t cnt, loff_t *ppos) | |
276 | { | |
48966364 | 277 | struct trace_parser parser; |
4ba7978e | 278 | ssize_t read, ret; |
b77e38aa | 279 | |
4ba7978e | 280 | if (!cnt) |
b77e38aa SR |
281 | return 0; |
282 | ||
1852fcce SR |
283 | ret = tracing_update_buffers(); |
284 | if (ret < 0) | |
285 | return ret; | |
286 | ||
48966364 | 287 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
288 | return -ENOMEM; |
289 | ||
48966364 | 290 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
291 | ||
4ba7978e | 292 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 293 | int set = 1; |
b77e38aa | 294 | |
48966364 | 295 | if (*parser.buffer == '!') |
b77e38aa | 296 | set = 0; |
b77e38aa | 297 | |
48966364 | 298 | parser.buffer[parser.idx] = 0; |
299 | ||
300 | ret = ftrace_set_clr_event(parser.buffer + !set, set); | |
b77e38aa | 301 | if (ret) |
48966364 | 302 | goto out_put; |
b77e38aa | 303 | } |
b77e38aa SR |
304 | |
305 | ret = read; | |
306 | ||
48966364 | 307 | out_put: |
308 | trace_parser_put(&parser); | |
b77e38aa SR |
309 | |
310 | return ret; | |
311 | } | |
312 | ||
313 | static void * | |
314 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
315 | { | |
30bd39cd | 316 | struct ftrace_event_call *call = v; |
b77e38aa SR |
317 | |
318 | (*pos)++; | |
319 | ||
30bd39cd | 320 | list_for_each_entry_continue(call, &ftrace_events, list) { |
40e26815 SR |
321 | /* |
322 | * The ftrace subsystem is for showing formats only. | |
323 | * They can not be enabled or disabled via the event files. | |
324 | */ | |
2239291a | 325 | if (call->class && (call->class->probe || call->class->reg)) |
30bd39cd | 326 | return call; |
40e26815 | 327 | } |
b77e38aa | 328 | |
30bd39cd | 329 | return NULL; |
b77e38aa SR |
330 | } |
331 | ||
332 | static void *t_start(struct seq_file *m, loff_t *pos) | |
333 | { | |
30bd39cd | 334 | struct ftrace_event_call *call; |
e1c7e2a6 LZ |
335 | loff_t l; |
336 | ||
20c8928a | 337 | mutex_lock(&event_mutex); |
e1c7e2a6 | 338 | |
30bd39cd | 339 | call = list_entry(&ftrace_events, struct ftrace_event_call, list); |
e1c7e2a6 | 340 | for (l = 0; l <= *pos; ) { |
30bd39cd | 341 | call = t_next(m, call, &l); |
e1c7e2a6 LZ |
342 | if (!call) |
343 | break; | |
344 | } | |
345 | return call; | |
b77e38aa SR |
346 | } |
347 | ||
348 | static void * | |
349 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
350 | { | |
30bd39cd | 351 | struct ftrace_event_call *call = v; |
b77e38aa SR |
352 | |
353 | (*pos)++; | |
354 | ||
30bd39cd LZ |
355 | list_for_each_entry_continue(call, &ftrace_events, list) { |
356 | if (call->enabled) | |
357 | return call; | |
b77e38aa SR |
358 | } |
359 | ||
30bd39cd | 360 | return NULL; |
b77e38aa SR |
361 | } |
362 | ||
363 | static void *s_start(struct seq_file *m, loff_t *pos) | |
364 | { | |
30bd39cd | 365 | struct ftrace_event_call *call; |
e1c7e2a6 LZ |
366 | loff_t l; |
367 | ||
20c8928a | 368 | mutex_lock(&event_mutex); |
e1c7e2a6 | 369 | |
30bd39cd | 370 | call = list_entry(&ftrace_events, struct ftrace_event_call, list); |
e1c7e2a6 | 371 | for (l = 0; l <= *pos; ) { |
30bd39cd | 372 | call = s_next(m, call, &l); |
e1c7e2a6 LZ |
373 | if (!call) |
374 | break; | |
375 | } | |
376 | return call; | |
b77e38aa SR |
377 | } |
378 | ||
379 | static int t_show(struct seq_file *m, void *v) | |
380 | { | |
381 | struct ftrace_event_call *call = v; | |
382 | ||
8f082018 SR |
383 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
384 | seq_printf(m, "%s:", call->class->system); | |
b77e38aa SR |
385 | seq_printf(m, "%s\n", call->name); |
386 | ||
387 | return 0; | |
388 | } | |
389 | ||
390 | static void t_stop(struct seq_file *m, void *p) | |
391 | { | |
20c8928a | 392 | mutex_unlock(&event_mutex); |
b77e38aa SR |
393 | } |
394 | ||
395 | static int | |
396 | ftrace_event_seq_open(struct inode *inode, struct file *file) | |
397 | { | |
b77e38aa SR |
398 | const struct seq_operations *seq_ops; |
399 | ||
400 | if ((file->f_mode & FMODE_WRITE) && | |
8650ae32 | 401 | (file->f_flags & O_TRUNC)) |
b77e38aa SR |
402 | ftrace_clear_events(); |
403 | ||
404 | seq_ops = inode->i_private; | |
20c8928a | 405 | return seq_open(file, seq_ops); |
b77e38aa SR |
406 | } |
407 | ||
1473e441 SR |
408 | static ssize_t |
409 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
410 | loff_t *ppos) | |
411 | { | |
412 | struct ftrace_event_call *call = filp->private_data; | |
413 | char *buf; | |
414 | ||
da4d0302 | 415 | if (call->enabled) |
1473e441 SR |
416 | buf = "1\n"; |
417 | else | |
418 | buf = "0\n"; | |
419 | ||
420 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
421 | } | |
422 | ||
423 | static ssize_t | |
424 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
425 | loff_t *ppos) | |
426 | { | |
427 | struct ftrace_event_call *call = filp->private_data; | |
428 | char buf[64]; | |
429 | unsigned long val; | |
430 | int ret; | |
431 | ||
432 | if (cnt >= sizeof(buf)) | |
433 | return -EINVAL; | |
434 | ||
435 | if (copy_from_user(&buf, ubuf, cnt)) | |
436 | return -EFAULT; | |
437 | ||
438 | buf[cnt] = 0; | |
439 | ||
440 | ret = strict_strtoul(buf, 10, &val); | |
441 | if (ret < 0) | |
442 | return ret; | |
443 | ||
1852fcce SR |
444 | ret = tracing_update_buffers(); |
445 | if (ret < 0) | |
446 | return ret; | |
447 | ||
1473e441 SR |
448 | switch (val) { |
449 | case 0: | |
1473e441 | 450 | case 1: |
11a241a3 | 451 | mutex_lock(&event_mutex); |
3b8e4273 | 452 | ret = ftrace_event_enable_disable(call, val); |
11a241a3 | 453 | mutex_unlock(&event_mutex); |
1473e441 SR |
454 | break; |
455 | ||
456 | default: | |
457 | return -EINVAL; | |
458 | } | |
459 | ||
460 | *ppos += cnt; | |
461 | ||
3b8e4273 | 462 | return ret ? ret : cnt; |
1473e441 SR |
463 | } |
464 | ||
8ae79a13 SR |
465 | static ssize_t |
466 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
467 | loff_t *ppos) | |
468 | { | |
c142b15d | 469 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
8ae79a13 SR |
470 | const char *system = filp->private_data; |
471 | struct ftrace_event_call *call; | |
472 | char buf[2]; | |
c142b15d | 473 | int set = 0; |
8ae79a13 SR |
474 | int ret; |
475 | ||
8ae79a13 SR |
476 | mutex_lock(&event_mutex); |
477 | list_for_each_entry(call, &ftrace_events, list) { | |
2239291a SR |
478 | if (!call->name || !call->class || |
479 | (!call->class->probe && !call->class->reg)) | |
8ae79a13 SR |
480 | continue; |
481 | ||
8f082018 | 482 | if (system && strcmp(call->class->system, system) != 0) |
8ae79a13 SR |
483 | continue; |
484 | ||
485 | /* | |
486 | * We need to find out if all the events are set | |
487 | * or if all events or cleared, or if we have | |
488 | * a mixture. | |
489 | */ | |
c142b15d LZ |
490 | set |= (1 << !!call->enabled); |
491 | ||
8ae79a13 SR |
492 | /* |
493 | * If we have a mixture, no need to look further. | |
494 | */ | |
c142b15d | 495 | if (set == 3) |
8ae79a13 SR |
496 | break; |
497 | } | |
498 | mutex_unlock(&event_mutex); | |
499 | ||
c142b15d | 500 | buf[0] = set_to_char[set]; |
8ae79a13 | 501 | buf[1] = '\n'; |
8ae79a13 SR |
502 | |
503 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
504 | ||
505 | return ret; | |
506 | } | |
507 | ||
508 | static ssize_t | |
509 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
510 | loff_t *ppos) | |
511 | { | |
512 | const char *system = filp->private_data; | |
513 | unsigned long val; | |
8ae79a13 SR |
514 | char buf[64]; |
515 | ssize_t ret; | |
516 | ||
517 | if (cnt >= sizeof(buf)) | |
518 | return -EINVAL; | |
519 | ||
520 | if (copy_from_user(&buf, ubuf, cnt)) | |
521 | return -EFAULT; | |
522 | ||
523 | buf[cnt] = 0; | |
524 | ||
525 | ret = strict_strtoul(buf, 10, &val); | |
526 | if (ret < 0) | |
527 | return ret; | |
528 | ||
529 | ret = tracing_update_buffers(); | |
530 | if (ret < 0) | |
531 | return ret; | |
532 | ||
8f31bfe5 | 533 | if (val != 0 && val != 1) |
8ae79a13 | 534 | return -EINVAL; |
8ae79a13 | 535 | |
8f31bfe5 | 536 | ret = __ftrace_set_clr_event(NULL, system, NULL, val); |
8ae79a13 | 537 | if (ret) |
8f31bfe5 | 538 | goto out; |
8ae79a13 SR |
539 | |
540 | ret = cnt; | |
541 | ||
8f31bfe5 | 542 | out: |
8ae79a13 SR |
543 | *ppos += cnt; |
544 | ||
545 | return ret; | |
546 | } | |
547 | ||
981d081e SR |
548 | static ssize_t |
549 | event_format_read(struct file *filp, char __user *ubuf, size_t cnt, | |
550 | loff_t *ppos) | |
551 | { | |
552 | struct ftrace_event_call *call = filp->private_data; | |
5a65e956 | 553 | struct ftrace_event_field *field; |
2e33af02 | 554 | struct list_head *head; |
981d081e | 555 | struct trace_seq *s; |
5a65e956 | 556 | int common_field_count = 5; |
981d081e | 557 | char *buf; |
5a65e956 | 558 | int r = 0; |
981d081e | 559 | |
c269fc8c TZ |
560 | if (*ppos) |
561 | return 0; | |
562 | ||
981d081e SR |
563 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
564 | if (!s) | |
565 | return -ENOMEM; | |
566 | ||
567 | trace_seq_init(s); | |
568 | ||
c5e4e192 SR |
569 | trace_seq_printf(s, "name: %s\n", call->name); |
570 | trace_seq_printf(s, "ID: %d\n", call->id); | |
571 | trace_seq_printf(s, "format:\n"); | |
91729ef9 | 572 | |
2e33af02 SR |
573 | head = trace_get_fields(call); |
574 | list_for_each_entry_reverse(field, head, link) { | |
5a65e956 LJ |
575 | /* |
576 | * Smartly shows the array type(except dynamic array). | |
577 | * Normal: | |
578 | * field:TYPE VAR | |
579 | * If TYPE := TYPE[LEN], it is shown: | |
580 | * field:TYPE VAR[LEN] | |
581 | */ | |
582 | const char *array_descriptor = strchr(field->type, '['); | |
583 | ||
584 | if (!strncmp(field->type, "__data_loc", 10)) | |
585 | array_descriptor = NULL; | |
586 | ||
587 | if (!array_descriptor) { | |
588 | r = trace_seq_printf(s, "\tfield:%s %s;\toffset:%u;" | |
589 | "\tsize:%u;\tsigned:%d;\n", | |
590 | field->type, field->name, field->offset, | |
591 | field->size, !!field->is_signed); | |
592 | } else { | |
593 | r = trace_seq_printf(s, "\tfield:%.*s %s%s;\toffset:%u;" | |
594 | "\tsize:%u;\tsigned:%d;\n", | |
595 | (int)(array_descriptor - field->type), | |
596 | field->type, field->name, | |
597 | array_descriptor, field->offset, | |
598 | field->size, !!field->is_signed); | |
599 | } | |
600 | ||
601 | if (--common_field_count == 0) | |
602 | r = trace_seq_printf(s, "\n"); | |
603 | ||
604 | if (!r) | |
605 | break; | |
606 | } | |
607 | ||
608 | if (r) | |
609 | r = trace_seq_printf(s, "\nprint fmt: %s\n", | |
610 | call->print_fmt); | |
611 | ||
981d081e SR |
612 | if (!r) { |
613 | /* | |
614 | * ug! The format output is bigger than a PAGE!! | |
615 | */ | |
616 | buf = "FORMAT TOO BIG\n"; | |
617 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
618 | buf, strlen(buf)); | |
619 | goto out; | |
620 | } | |
621 | ||
622 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
623 | s->buffer, s->len); | |
624 | out: | |
625 | kfree(s); | |
626 | return r; | |
627 | } | |
628 | ||
23725aee PZ |
629 | static ssize_t |
630 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
631 | { | |
632 | struct ftrace_event_call *call = filp->private_data; | |
633 | struct trace_seq *s; | |
634 | int r; | |
635 | ||
636 | if (*ppos) | |
637 | return 0; | |
638 | ||
639 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
640 | if (!s) | |
641 | return -ENOMEM; | |
642 | ||
643 | trace_seq_init(s); | |
644 | trace_seq_printf(s, "%d\n", call->id); | |
645 | ||
646 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
647 | s->buffer, s->len); | |
648 | kfree(s); | |
649 | return r; | |
650 | } | |
651 | ||
7ce7e424 TZ |
652 | static ssize_t |
653 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
654 | loff_t *ppos) | |
655 | { | |
656 | struct ftrace_event_call *call = filp->private_data; | |
657 | struct trace_seq *s; | |
658 | int r; | |
659 | ||
660 | if (*ppos) | |
661 | return 0; | |
662 | ||
663 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
664 | if (!s) | |
665 | return -ENOMEM; | |
666 | ||
667 | trace_seq_init(s); | |
668 | ||
8b372562 | 669 | print_event_filter(call, s); |
4bda2d51 | 670 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
671 | |
672 | kfree(s); | |
673 | ||
674 | return r; | |
675 | } | |
676 | ||
677 | static ssize_t | |
678 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
679 | loff_t *ppos) | |
680 | { | |
681 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 682 | char *buf; |
7ce7e424 TZ |
683 | int err; |
684 | ||
8b372562 | 685 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
686 | return -EINVAL; |
687 | ||
8b372562 TZ |
688 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
689 | if (!buf) | |
7ce7e424 TZ |
690 | return -ENOMEM; |
691 | ||
8b372562 TZ |
692 | if (copy_from_user(buf, ubuf, cnt)) { |
693 | free_page((unsigned long) buf); | |
694 | return -EFAULT; | |
7ce7e424 | 695 | } |
8b372562 | 696 | buf[cnt] = '\0'; |
7ce7e424 | 697 | |
8b372562 TZ |
698 | err = apply_event_filter(call, buf); |
699 | free_page((unsigned long) buf); | |
700 | if (err < 0) | |
44e9c8b7 | 701 | return err; |
0a19e53c | 702 | |
7ce7e424 TZ |
703 | *ppos += cnt; |
704 | ||
705 | return cnt; | |
706 | } | |
707 | ||
cfb180f3 TZ |
708 | static ssize_t |
709 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
710 | loff_t *ppos) | |
711 | { | |
712 | struct event_subsystem *system = filp->private_data; | |
713 | struct trace_seq *s; | |
714 | int r; | |
715 | ||
716 | if (*ppos) | |
717 | return 0; | |
718 | ||
719 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
720 | if (!s) | |
721 | return -ENOMEM; | |
722 | ||
723 | trace_seq_init(s); | |
724 | ||
8b372562 | 725 | print_subsystem_event_filter(system, s); |
4bda2d51 | 726 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
727 | |
728 | kfree(s); | |
729 | ||
730 | return r; | |
731 | } | |
732 | ||
733 | static ssize_t | |
734 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
735 | loff_t *ppos) | |
736 | { | |
737 | struct event_subsystem *system = filp->private_data; | |
8b372562 | 738 | char *buf; |
cfb180f3 TZ |
739 | int err; |
740 | ||
8b372562 | 741 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
742 | return -EINVAL; |
743 | ||
8b372562 TZ |
744 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
745 | if (!buf) | |
cfb180f3 TZ |
746 | return -ENOMEM; |
747 | ||
8b372562 TZ |
748 | if (copy_from_user(buf, ubuf, cnt)) { |
749 | free_page((unsigned long) buf); | |
750 | return -EFAULT; | |
cfb180f3 | 751 | } |
8b372562 | 752 | buf[cnt] = '\0'; |
cfb180f3 | 753 | |
8b372562 TZ |
754 | err = apply_subsystem_event_filter(system, buf); |
755 | free_page((unsigned long) buf); | |
756 | if (err < 0) | |
44e9c8b7 | 757 | return err; |
cfb180f3 TZ |
758 | |
759 | *ppos += cnt; | |
760 | ||
761 | return cnt; | |
762 | } | |
763 | ||
d1b182a8 SR |
764 | static ssize_t |
765 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
766 | { | |
767 | int (*func)(struct trace_seq *s) = filp->private_data; | |
768 | struct trace_seq *s; | |
769 | int r; | |
770 | ||
771 | if (*ppos) | |
772 | return 0; | |
773 | ||
774 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
775 | if (!s) | |
776 | return -ENOMEM; | |
777 | ||
778 | trace_seq_init(s); | |
779 | ||
780 | func(s); | |
781 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
782 | ||
783 | kfree(s); | |
784 | ||
785 | return r; | |
786 | } | |
787 | ||
b77e38aa SR |
788 | static const struct seq_operations show_event_seq_ops = { |
789 | .start = t_start, | |
790 | .next = t_next, | |
791 | .show = t_show, | |
792 | .stop = t_stop, | |
793 | }; | |
794 | ||
795 | static const struct seq_operations show_set_event_seq_ops = { | |
796 | .start = s_start, | |
797 | .next = s_next, | |
798 | .show = t_show, | |
799 | .stop = t_stop, | |
800 | }; | |
801 | ||
2314c4ae SR |
802 | static const struct file_operations ftrace_avail_fops = { |
803 | .open = ftrace_event_seq_open, | |
804 | .read = seq_read, | |
805 | .llseek = seq_lseek, | |
806 | .release = seq_release, | |
807 | }; | |
808 | ||
b77e38aa SR |
809 | static const struct file_operations ftrace_set_event_fops = { |
810 | .open = ftrace_event_seq_open, | |
811 | .read = seq_read, | |
812 | .write = ftrace_event_write, | |
813 | .llseek = seq_lseek, | |
814 | .release = seq_release, | |
815 | }; | |
816 | ||
1473e441 SR |
817 | static const struct file_operations ftrace_enable_fops = { |
818 | .open = tracing_open_generic, | |
819 | .read = event_enable_read, | |
820 | .write = event_enable_write, | |
821 | }; | |
822 | ||
981d081e SR |
823 | static const struct file_operations ftrace_event_format_fops = { |
824 | .open = tracing_open_generic, | |
825 | .read = event_format_read, | |
826 | }; | |
827 | ||
23725aee PZ |
828 | static const struct file_operations ftrace_event_id_fops = { |
829 | .open = tracing_open_generic, | |
830 | .read = event_id_read, | |
831 | }; | |
832 | ||
7ce7e424 TZ |
833 | static const struct file_operations ftrace_event_filter_fops = { |
834 | .open = tracing_open_generic, | |
835 | .read = event_filter_read, | |
836 | .write = event_filter_write, | |
837 | }; | |
838 | ||
cfb180f3 TZ |
839 | static const struct file_operations ftrace_subsystem_filter_fops = { |
840 | .open = tracing_open_generic, | |
841 | .read = subsystem_filter_read, | |
842 | .write = subsystem_filter_write, | |
843 | }; | |
844 | ||
8ae79a13 SR |
845 | static const struct file_operations ftrace_system_enable_fops = { |
846 | .open = tracing_open_generic, | |
847 | .read = system_enable_read, | |
848 | .write = system_enable_write, | |
849 | }; | |
850 | ||
d1b182a8 SR |
851 | static const struct file_operations ftrace_show_header_fops = { |
852 | .open = tracing_open_generic, | |
853 | .read = show_header, | |
854 | }; | |
855 | ||
1473e441 SR |
856 | static struct dentry *event_trace_events_dir(void) |
857 | { | |
858 | static struct dentry *d_tracer; | |
859 | static struct dentry *d_events; | |
860 | ||
861 | if (d_events) | |
862 | return d_events; | |
863 | ||
864 | d_tracer = tracing_init_dentry(); | |
865 | if (!d_tracer) | |
866 | return NULL; | |
867 | ||
868 | d_events = debugfs_create_dir("events", d_tracer); | |
869 | if (!d_events) | |
870 | pr_warning("Could not create debugfs " | |
871 | "'events' directory\n"); | |
872 | ||
873 | return d_events; | |
874 | } | |
875 | ||
6ecc2d1c SR |
876 | static LIST_HEAD(event_subsystems); |
877 | ||
878 | static struct dentry * | |
879 | event_subsystem_dir(const char *name, struct dentry *d_events) | |
880 | { | |
881 | struct event_subsystem *system; | |
e1112b4d | 882 | struct dentry *entry; |
6ecc2d1c SR |
883 | |
884 | /* First see if we did not already create this dir */ | |
885 | list_for_each_entry(system, &event_subsystems, list) { | |
dc82ec98 XG |
886 | if (strcmp(system->name, name) == 0) { |
887 | system->nr_events++; | |
6ecc2d1c | 888 | return system->entry; |
dc82ec98 | 889 | } |
6ecc2d1c SR |
890 | } |
891 | ||
892 | /* need to create new entry */ | |
893 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
894 | if (!system) { | |
895 | pr_warning("No memory to create event subsystem %s\n", | |
896 | name); | |
897 | return d_events; | |
898 | } | |
899 | ||
900 | system->entry = debugfs_create_dir(name, d_events); | |
901 | if (!system->entry) { | |
902 | pr_warning("Could not create event subsystem %s\n", | |
903 | name); | |
904 | kfree(system); | |
905 | return d_events; | |
906 | } | |
907 | ||
dc82ec98 | 908 | system->nr_events = 1; |
6d723736 SR |
909 | system->name = kstrdup(name, GFP_KERNEL); |
910 | if (!system->name) { | |
911 | debugfs_remove(system->entry); | |
912 | kfree(system); | |
913 | return d_events; | |
914 | } | |
915 | ||
6ecc2d1c SR |
916 | list_add(&system->list, &event_subsystems); |
917 | ||
30e673b2 | 918 | system->filter = NULL; |
cfb180f3 | 919 | |
8b372562 TZ |
920 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
921 | if (!system->filter) { | |
922 | pr_warning("Could not allocate filter for subsystem " | |
923 | "'%s'\n", name); | |
924 | return system->entry; | |
925 | } | |
926 | ||
e1112b4d TZ |
927 | entry = debugfs_create_file("filter", 0644, system->entry, system, |
928 | &ftrace_subsystem_filter_fops); | |
8b372562 TZ |
929 | if (!entry) { |
930 | kfree(system->filter); | |
931 | system->filter = NULL; | |
e1112b4d TZ |
932 | pr_warning("Could not create debugfs " |
933 | "'%s/filter' entry\n", name); | |
8b372562 | 934 | } |
e1112b4d | 935 | |
f3f3f009 FW |
936 | trace_create_file("enable", 0644, system->entry, |
937 | (void *)system->name, | |
938 | &ftrace_system_enable_fops); | |
8ae79a13 | 939 | |
6ecc2d1c SR |
940 | return system->entry; |
941 | } | |
942 | ||
1473e441 | 943 | static int |
701970b3 SR |
944 | event_create_dir(struct ftrace_event_call *call, struct dentry *d_events, |
945 | const struct file_operations *id, | |
946 | const struct file_operations *enable, | |
947 | const struct file_operations *filter, | |
948 | const struct file_operations *format) | |
1473e441 | 949 | { |
2e33af02 | 950 | struct list_head *head; |
fd994989 | 951 | int ret; |
1473e441 | 952 | |
6ecc2d1c SR |
953 | /* |
954 | * If the trace point header did not define TRACE_SYSTEM | |
955 | * then the system would be called "TRACE_SYSTEM". | |
956 | */ | |
8f082018 SR |
957 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
958 | d_events = event_subsystem_dir(call->class->system, d_events); | |
6ecc2d1c | 959 | |
1473e441 SR |
960 | call->dir = debugfs_create_dir(call->name, d_events); |
961 | if (!call->dir) { | |
962 | pr_warning("Could not create debugfs " | |
963 | "'%s' directory\n", call->name); | |
964 | return -1; | |
965 | } | |
966 | ||
2239291a | 967 | if (call->class->probe || call->class->reg) |
f3f3f009 FW |
968 | trace_create_file("enable", 0644, call->dir, call, |
969 | enable); | |
1473e441 | 970 | |
2239291a SR |
971 | #ifdef CONFIG_PERF_EVENTS |
972 | if (call->id && (call->class->perf_probe || call->class->reg)) | |
f3f3f009 FW |
973 | trace_create_file("id", 0444, call->dir, call, |
974 | id); | |
2239291a | 975 | #endif |
23725aee | 976 | |
2e33af02 SR |
977 | if (call->class->define_fields) { |
978 | /* | |
979 | * Other events may have the same class. Only update | |
980 | * the fields if they are not already defined. | |
981 | */ | |
982 | head = trace_get_fields(call); | |
983 | if (list_empty(head)) { | |
984 | ret = trace_define_common_fields(call); | |
985 | if (!ret) | |
986 | ret = call->class->define_fields(call); | |
987 | if (ret < 0) { | |
988 | pr_warning("Could not initialize trace point" | |
989 | " events/%s\n", call->name); | |
990 | return ret; | |
991 | } | |
cf027f64 | 992 | } |
f3f3f009 FW |
993 | trace_create_file("filter", 0644, call->dir, call, |
994 | filter); | |
cf027f64 TZ |
995 | } |
996 | ||
f3f3f009 FW |
997 | trace_create_file("format", 0444, call->dir, call, |
998 | format); | |
6d723736 SR |
999 | |
1000 | return 0; | |
1001 | } | |
1002 | ||
bd1a5c84 MH |
1003 | static int __trace_add_event_call(struct ftrace_event_call *call) |
1004 | { | |
1005 | struct dentry *d_events; | |
1006 | int ret; | |
6d723736 | 1007 | |
bd1a5c84 MH |
1008 | if (!call->name) |
1009 | return -EINVAL; | |
701970b3 | 1010 | |
0405ab80 SR |
1011 | if (call->class->raw_init) { |
1012 | ret = call->class->raw_init(call); | |
bd1a5c84 MH |
1013 | if (ret < 0) { |
1014 | if (ret != -ENOSYS) | |
1015 | pr_warning("Could not initialize trace " | |
1016 | "events/%s\n", call->name); | |
1017 | return ret; | |
1018 | } | |
1019 | } | |
701970b3 | 1020 | |
bd1a5c84 MH |
1021 | d_events = event_trace_events_dir(); |
1022 | if (!d_events) | |
1023 | return -ENOENT; | |
1024 | ||
588bebb7 | 1025 | ret = event_create_dir(call, d_events, &ftrace_event_id_fops, |
bd1a5c84 MH |
1026 | &ftrace_enable_fops, &ftrace_event_filter_fops, |
1027 | &ftrace_event_format_fops); | |
88f70d75 MH |
1028 | if (!ret) |
1029 | list_add(&call->list, &ftrace_events); | |
1030 | ||
588bebb7 | 1031 | return ret; |
bd1a5c84 MH |
1032 | } |
1033 | ||
1034 | /* Add an additional event_call dynamically */ | |
1035 | int trace_add_event_call(struct ftrace_event_call *call) | |
1036 | { | |
1037 | int ret; | |
1038 | mutex_lock(&event_mutex); | |
1039 | ret = __trace_add_event_call(call); | |
1040 | mutex_unlock(&event_mutex); | |
1041 | return ret; | |
1042 | } | |
701970b3 | 1043 | |
a2ca5e03 FW |
1044 | static void remove_subsystem_dir(const char *name) |
1045 | { | |
1046 | struct event_subsystem *system; | |
1047 | ||
1048 | if (strcmp(name, TRACE_SYSTEM) == 0) | |
1049 | return; | |
1050 | ||
1051 | list_for_each_entry(system, &event_subsystems, list) { | |
1052 | if (strcmp(system->name, name) == 0) { | |
1053 | if (!--system->nr_events) { | |
1054 | struct event_filter *filter = system->filter; | |
1055 | ||
1056 | debugfs_remove_recursive(system->entry); | |
1057 | list_del(&system->list); | |
1058 | if (filter) { | |
1059 | kfree(filter->filter_string); | |
1060 | kfree(filter); | |
1061 | } | |
1062 | kfree(system->name); | |
1063 | kfree(system); | |
1064 | } | |
1065 | break; | |
1066 | } | |
1067 | } | |
1068 | } | |
1069 | ||
4fead8e4 MH |
1070 | /* |
1071 | * Must be called under locking both of event_mutex and trace_event_mutex. | |
1072 | */ | |
bd1a5c84 MH |
1073 | static void __trace_remove_event_call(struct ftrace_event_call *call) |
1074 | { | |
1075 | ftrace_event_enable_disable(call, 0); | |
80decc70 SR |
1076 | if (call->event.funcs) |
1077 | __unregister_ftrace_event(&call->event); | |
bd1a5c84 MH |
1078 | debugfs_remove_recursive(call->dir); |
1079 | list_del(&call->list); | |
1080 | trace_destroy_fields(call); | |
1081 | destroy_preds(call); | |
8f082018 | 1082 | remove_subsystem_dir(call->class->system); |
bd1a5c84 MH |
1083 | } |
1084 | ||
1085 | /* Remove an event_call */ | |
1086 | void trace_remove_event_call(struct ftrace_event_call *call) | |
1087 | { | |
1088 | mutex_lock(&event_mutex); | |
4fead8e4 | 1089 | down_write(&trace_event_mutex); |
bd1a5c84 | 1090 | __trace_remove_event_call(call); |
4fead8e4 | 1091 | up_write(&trace_event_mutex); |
bd1a5c84 MH |
1092 | mutex_unlock(&event_mutex); |
1093 | } | |
1094 | ||
1095 | #define for_each_event(event, start, end) \ | |
1096 | for (event = start; \ | |
1097 | (unsigned long)event < (unsigned long)end; \ | |
1098 | event++) | |
1099 | ||
1100 | #ifdef CONFIG_MODULES | |
1101 | ||
1102 | static LIST_HEAD(ftrace_module_file_list); | |
1103 | ||
1104 | /* | |
1105 | * Modules must own their file_operations to keep up with | |
1106 | * reference counting. | |
1107 | */ | |
1108 | struct ftrace_module_file_ops { | |
1109 | struct list_head list; | |
1110 | struct module *mod; | |
1111 | struct file_operations id; | |
1112 | struct file_operations enable; | |
1113 | struct file_operations format; | |
1114 | struct file_operations filter; | |
1115 | }; | |
1116 | ||
701970b3 SR |
1117 | static struct ftrace_module_file_ops * |
1118 | trace_create_file_ops(struct module *mod) | |
1119 | { | |
1120 | struct ftrace_module_file_ops *file_ops; | |
1121 | ||
1122 | /* | |
1123 | * This is a bit of a PITA. To allow for correct reference | |
1124 | * counting, modules must "own" their file_operations. | |
1125 | * To do this, we allocate the file operations that will be | |
1126 | * used in the event directory. | |
1127 | */ | |
1128 | ||
1129 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1130 | if (!file_ops) | |
1131 | return NULL; | |
1132 | ||
1133 | file_ops->mod = mod; | |
1134 | ||
1135 | file_ops->id = ftrace_event_id_fops; | |
1136 | file_ops->id.owner = mod; | |
1137 | ||
1138 | file_ops->enable = ftrace_enable_fops; | |
1139 | file_ops->enable.owner = mod; | |
1140 | ||
1141 | file_ops->filter = ftrace_event_filter_fops; | |
1142 | file_ops->filter.owner = mod; | |
1143 | ||
1144 | file_ops->format = ftrace_event_format_fops; | |
1145 | file_ops->format.owner = mod; | |
1146 | ||
1147 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1148 | ||
1149 | return file_ops; | |
1150 | } | |
1151 | ||
6d723736 SR |
1152 | static void trace_module_add_events(struct module *mod) |
1153 | { | |
701970b3 | 1154 | struct ftrace_module_file_ops *file_ops = NULL; |
6d723736 SR |
1155 | struct ftrace_event_call *call, *start, *end; |
1156 | struct dentry *d_events; | |
f744bd57 | 1157 | int ret; |
6d723736 SR |
1158 | |
1159 | start = mod->trace_events; | |
1160 | end = mod->trace_events + mod->num_trace_events; | |
1161 | ||
1162 | if (start == end) | |
1163 | return; | |
1164 | ||
1165 | d_events = event_trace_events_dir(); | |
1166 | if (!d_events) | |
1167 | return; | |
1168 | ||
1169 | for_each_event(call, start, end) { | |
1170 | /* The linker may leave blanks */ | |
1171 | if (!call->name) | |
1172 | continue; | |
0405ab80 SR |
1173 | if (call->class->raw_init) { |
1174 | ret = call->class->raw_init(call); | |
f744bd57 JB |
1175 | if (ret < 0) { |
1176 | if (ret != -ENOSYS) | |
1177 | pr_warning("Could not initialize trace " | |
1178 | "point events/%s\n", call->name); | |
1179 | continue; | |
1180 | } | |
1181 | } | |
701970b3 SR |
1182 | /* |
1183 | * This module has events, create file ops for this module | |
1184 | * if not already done. | |
1185 | */ | |
1186 | if (!file_ops) { | |
1187 | file_ops = trace_create_file_ops(mod); | |
1188 | if (!file_ops) | |
1189 | return; | |
1190 | } | |
6d723736 | 1191 | call->mod = mod; |
88f70d75 MH |
1192 | ret = event_create_dir(call, d_events, |
1193 | &file_ops->id, &file_ops->enable, | |
1194 | &file_ops->filter, &file_ops->format); | |
1195 | if (!ret) | |
1196 | list_add(&call->list, &ftrace_events); | |
6d723736 SR |
1197 | } |
1198 | } | |
1199 | ||
1200 | static void trace_module_remove_events(struct module *mod) | |
1201 | { | |
701970b3 | 1202 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1203 | struct ftrace_event_call *call, *p; |
9456f0fa | 1204 | bool found = false; |
6d723736 | 1205 | |
110bf2b7 | 1206 | down_write(&trace_event_mutex); |
6d723736 SR |
1207 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1208 | if (call->mod == mod) { | |
9456f0fa | 1209 | found = true; |
bd1a5c84 | 1210 | __trace_remove_event_call(call); |
6d723736 SR |
1211 | } |
1212 | } | |
701970b3 SR |
1213 | |
1214 | /* Now free the file_operations */ | |
1215 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1216 | if (file_ops->mod == mod) | |
1217 | break; | |
1218 | } | |
1219 | if (&file_ops->list != &ftrace_module_file_list) { | |
1220 | list_del(&file_ops->list); | |
1221 | kfree(file_ops); | |
1222 | } | |
9456f0fa SR |
1223 | |
1224 | /* | |
1225 | * It is safest to reset the ring buffer if the module being unloaded | |
1226 | * registered any events. | |
1227 | */ | |
1228 | if (found) | |
1229 | tracing_reset_current_online_cpus(); | |
110bf2b7 | 1230 | up_write(&trace_event_mutex); |
6d723736 SR |
1231 | } |
1232 | ||
61f919a1 SR |
1233 | static int trace_module_notify(struct notifier_block *self, |
1234 | unsigned long val, void *data) | |
6d723736 SR |
1235 | { |
1236 | struct module *mod = data; | |
1237 | ||
1238 | mutex_lock(&event_mutex); | |
1239 | switch (val) { | |
1240 | case MODULE_STATE_COMING: | |
1241 | trace_module_add_events(mod); | |
1242 | break; | |
1243 | case MODULE_STATE_GOING: | |
1244 | trace_module_remove_events(mod); | |
1245 | break; | |
1246 | } | |
1247 | mutex_unlock(&event_mutex); | |
fd994989 | 1248 | |
1473e441 SR |
1249 | return 0; |
1250 | } | |
61f919a1 SR |
1251 | #else |
1252 | static int trace_module_notify(struct notifier_block *self, | |
1253 | unsigned long val, void *data) | |
1254 | { | |
1255 | return 0; | |
1256 | } | |
1257 | #endif /* CONFIG_MODULES */ | |
1473e441 | 1258 | |
ec827c7e | 1259 | static struct notifier_block trace_module_nb = { |
6d723736 SR |
1260 | .notifier_call = trace_module_notify, |
1261 | .priority = 0, | |
1262 | }; | |
1263 | ||
a59fd602 SR |
1264 | extern struct ftrace_event_call __start_ftrace_events[]; |
1265 | extern struct ftrace_event_call __stop_ftrace_events[]; | |
1266 | ||
020e5f85 LZ |
1267 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
1268 | ||
1269 | static __init int setup_trace_event(char *str) | |
1270 | { | |
1271 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
1272 | ring_buffer_expanded = 1; | |
1273 | tracing_selftest_disabled = 1; | |
1274 | ||
1275 | return 1; | |
1276 | } | |
1277 | __setup("trace_event=", setup_trace_event); | |
1278 | ||
b77e38aa SR |
1279 | static __init int event_trace_init(void) |
1280 | { | |
a59fd602 | 1281 | struct ftrace_event_call *call; |
b77e38aa SR |
1282 | struct dentry *d_tracer; |
1283 | struct dentry *entry; | |
1473e441 | 1284 | struct dentry *d_events; |
6d723736 | 1285 | int ret; |
020e5f85 LZ |
1286 | char *buf = bootup_event_buf; |
1287 | char *token; | |
b77e38aa SR |
1288 | |
1289 | d_tracer = tracing_init_dentry(); | |
1290 | if (!d_tracer) | |
1291 | return 0; | |
1292 | ||
2314c4ae SR |
1293 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
1294 | (void *)&show_event_seq_ops, | |
1295 | &ftrace_avail_fops); | |
1296 | if (!entry) | |
1297 | pr_warning("Could not create debugfs " | |
1298 | "'available_events' entry\n"); | |
1299 | ||
b77e38aa SR |
1300 | entry = debugfs_create_file("set_event", 0644, d_tracer, |
1301 | (void *)&show_set_event_seq_ops, | |
1302 | &ftrace_set_event_fops); | |
1303 | if (!entry) | |
1304 | pr_warning("Could not create debugfs " | |
1305 | "'set_event' entry\n"); | |
1306 | ||
1473e441 SR |
1307 | d_events = event_trace_events_dir(); |
1308 | if (!d_events) | |
1309 | return 0; | |
1310 | ||
d1b182a8 SR |
1311 | /* ring buffer internal formats */ |
1312 | trace_create_file("header_page", 0444, d_events, | |
1313 | ring_buffer_print_page_header, | |
1314 | &ftrace_show_header_fops); | |
1315 | ||
1316 | trace_create_file("header_event", 0444, d_events, | |
1317 | ring_buffer_print_entry_header, | |
1318 | &ftrace_show_header_fops); | |
1319 | ||
8ae79a13 | 1320 | trace_create_file("enable", 0644, d_events, |
8f31bfe5 | 1321 | NULL, &ftrace_system_enable_fops); |
8ae79a13 | 1322 | |
6d723736 | 1323 | for_each_event(call, __start_ftrace_events, __stop_ftrace_events) { |
1473e441 SR |
1324 | /* The linker may leave blanks */ |
1325 | if (!call->name) | |
1326 | continue; | |
0405ab80 SR |
1327 | if (call->class->raw_init) { |
1328 | ret = call->class->raw_init(call); | |
f744bd57 JB |
1329 | if (ret < 0) { |
1330 | if (ret != -ENOSYS) | |
1331 | pr_warning("Could not initialize trace " | |
1332 | "point events/%s\n", call->name); | |
1333 | continue; | |
1334 | } | |
1335 | } | |
88f70d75 MH |
1336 | ret = event_create_dir(call, d_events, &ftrace_event_id_fops, |
1337 | &ftrace_enable_fops, | |
1338 | &ftrace_event_filter_fops, | |
1339 | &ftrace_event_format_fops); | |
1340 | if (!ret) | |
1341 | list_add(&call->list, &ftrace_events); | |
1473e441 SR |
1342 | } |
1343 | ||
020e5f85 LZ |
1344 | while (true) { |
1345 | token = strsep(&buf, ","); | |
1346 | ||
1347 | if (!token) | |
1348 | break; | |
1349 | if (!*token) | |
1350 | continue; | |
1351 | ||
1352 | ret = ftrace_set_clr_event(token, 1); | |
1353 | if (ret) | |
1354 | pr_warning("Failed to enable trace event: %s\n", token); | |
1355 | } | |
1356 | ||
6d723736 | 1357 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 1358 | if (ret) |
6d723736 SR |
1359 | pr_warning("Failed to register trace events module notifier\n"); |
1360 | ||
b77e38aa SR |
1361 | return 0; |
1362 | } | |
1363 | fs_initcall(event_trace_init); | |
e6187007 SR |
1364 | |
1365 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1366 | ||
1367 | static DEFINE_SPINLOCK(test_spinlock); | |
1368 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
1369 | static DEFINE_MUTEX(test_mutex); | |
1370 | ||
1371 | static __init void test_work(struct work_struct *dummy) | |
1372 | { | |
1373 | spin_lock(&test_spinlock); | |
1374 | spin_lock_irq(&test_spinlock_irq); | |
1375 | udelay(1); | |
1376 | spin_unlock_irq(&test_spinlock_irq); | |
1377 | spin_unlock(&test_spinlock); | |
1378 | ||
1379 | mutex_lock(&test_mutex); | |
1380 | msleep(1); | |
1381 | mutex_unlock(&test_mutex); | |
1382 | } | |
1383 | ||
1384 | static __init int event_test_thread(void *unused) | |
1385 | { | |
1386 | void *test_malloc; | |
1387 | ||
1388 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
1389 | if (!test_malloc) | |
1390 | pr_info("failed to kmalloc\n"); | |
1391 | ||
1392 | schedule_on_each_cpu(test_work); | |
1393 | ||
1394 | kfree(test_malloc); | |
1395 | ||
1396 | set_current_state(TASK_INTERRUPTIBLE); | |
1397 | while (!kthread_should_stop()) | |
1398 | schedule(); | |
1399 | ||
1400 | return 0; | |
1401 | } | |
1402 | ||
1403 | /* | |
1404 | * Do various things that may trigger events. | |
1405 | */ | |
1406 | static __init void event_test_stuff(void) | |
1407 | { | |
1408 | struct task_struct *test_thread; | |
1409 | ||
1410 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
1411 | msleep(1); | |
1412 | kthread_stop(test_thread); | |
1413 | } | |
1414 | ||
1415 | /* | |
1416 | * For every trace event defined, we will test each trace point separately, | |
1417 | * and then by groups, and finally all trace points. | |
1418 | */ | |
9ea21c1e | 1419 | static __init void event_trace_self_tests(void) |
e6187007 SR |
1420 | { |
1421 | struct ftrace_event_call *call; | |
1422 | struct event_subsystem *system; | |
e6187007 SR |
1423 | int ret; |
1424 | ||
1425 | pr_info("Running tests on trace events:\n"); | |
1426 | ||
1427 | list_for_each_entry(call, &ftrace_events, list) { | |
1428 | ||
2239291a SR |
1429 | /* Only test those that have a probe */ |
1430 | if (!call->class || !call->class->probe) | |
e6187007 SR |
1431 | continue; |
1432 | ||
1f5a6b45 SR |
1433 | /* |
1434 | * Testing syscall events here is pretty useless, but | |
1435 | * we still do it if configured. But this is time consuming. | |
1436 | * What we really need is a user thread to perform the | |
1437 | * syscalls as we test. | |
1438 | */ | |
1439 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
1440 | if (call->class->system && |
1441 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
1442 | continue; |
1443 | #endif | |
1444 | ||
e6187007 SR |
1445 | pr_info("Testing event %s: ", call->name); |
1446 | ||
1447 | /* | |
1448 | * If an event is already enabled, someone is using | |
1449 | * it and the self test should not be on. | |
1450 | */ | |
1451 | if (call->enabled) { | |
1452 | pr_warning("Enabled event during self test!\n"); | |
1453 | WARN_ON_ONCE(1); | |
1454 | continue; | |
1455 | } | |
1456 | ||
0e907c99 | 1457 | ftrace_event_enable_disable(call, 1); |
e6187007 | 1458 | event_test_stuff(); |
0e907c99 | 1459 | ftrace_event_enable_disable(call, 0); |
e6187007 SR |
1460 | |
1461 | pr_cont("OK\n"); | |
1462 | } | |
1463 | ||
1464 | /* Now test at the sub system level */ | |
1465 | ||
1466 | pr_info("Running tests on trace event systems:\n"); | |
1467 | ||
1468 | list_for_each_entry(system, &event_subsystems, list) { | |
1469 | ||
1470 | /* the ftrace system is special, skip it */ | |
1471 | if (strcmp(system->name, "ftrace") == 0) | |
1472 | continue; | |
1473 | ||
1474 | pr_info("Testing event system %s: ", system->name); | |
1475 | ||
8f31bfe5 | 1476 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1); |
e6187007 SR |
1477 | if (WARN_ON_ONCE(ret)) { |
1478 | pr_warning("error enabling system %s\n", | |
1479 | system->name); | |
1480 | continue; | |
1481 | } | |
1482 | ||
1483 | event_test_stuff(); | |
1484 | ||
8f31bfe5 | 1485 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0); |
e6187007 SR |
1486 | if (WARN_ON_ONCE(ret)) |
1487 | pr_warning("error disabling system %s\n", | |
1488 | system->name); | |
1489 | ||
1490 | pr_cont("OK\n"); | |
1491 | } | |
1492 | ||
1493 | /* Test with all events enabled */ | |
1494 | ||
1495 | pr_info("Running tests on all trace events:\n"); | |
1496 | pr_info("Testing all events: "); | |
1497 | ||
8f31bfe5 | 1498 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1); |
e6187007 | 1499 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 1500 | pr_warning("error enabling all events\n"); |
9ea21c1e | 1501 | return; |
e6187007 SR |
1502 | } |
1503 | ||
1504 | event_test_stuff(); | |
1505 | ||
1506 | /* reset sysname */ | |
8f31bfe5 | 1507 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0); |
e6187007 SR |
1508 | if (WARN_ON_ONCE(ret)) { |
1509 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 1510 | return; |
e6187007 SR |
1511 | } |
1512 | ||
1513 | pr_cont("OK\n"); | |
9ea21c1e SR |
1514 | } |
1515 | ||
1516 | #ifdef CONFIG_FUNCTION_TRACER | |
1517 | ||
245b2e70 | 1518 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e SR |
1519 | |
1520 | static void | |
1521 | function_test_events_call(unsigned long ip, unsigned long parent_ip) | |
1522 | { | |
1523 | struct ring_buffer_event *event; | |
e77405ad | 1524 | struct ring_buffer *buffer; |
9ea21c1e SR |
1525 | struct ftrace_entry *entry; |
1526 | unsigned long flags; | |
1527 | long disabled; | |
1528 | int resched; | |
1529 | int cpu; | |
1530 | int pc; | |
1531 | ||
1532 | pc = preempt_count(); | |
1533 | resched = ftrace_preempt_disable(); | |
1534 | cpu = raw_smp_processor_id(); | |
245b2e70 | 1535 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
1536 | |
1537 | if (disabled != 1) | |
1538 | goto out; | |
1539 | ||
1540 | local_save_flags(flags); | |
1541 | ||
e77405ad SR |
1542 | event = trace_current_buffer_lock_reserve(&buffer, |
1543 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
1544 | flags, pc); |
1545 | if (!event) | |
1546 | goto out; | |
1547 | entry = ring_buffer_event_data(event); | |
1548 | entry->ip = ip; | |
1549 | entry->parent_ip = parent_ip; | |
1550 | ||
e77405ad | 1551 | trace_nowake_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
1552 | |
1553 | out: | |
245b2e70 | 1554 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
1555 | ftrace_preempt_enable(resched); |
1556 | } | |
1557 | ||
1558 | static struct ftrace_ops trace_ops __initdata = | |
1559 | { | |
1560 | .func = function_test_events_call, | |
1561 | }; | |
1562 | ||
1563 | static __init void event_trace_self_test_with_function(void) | |
1564 | { | |
1565 | register_ftrace_function(&trace_ops); | |
1566 | pr_info("Running tests again, along with the function tracer\n"); | |
1567 | event_trace_self_tests(); | |
1568 | unregister_ftrace_function(&trace_ops); | |
1569 | } | |
1570 | #else | |
1571 | static __init void event_trace_self_test_with_function(void) | |
1572 | { | |
1573 | } | |
1574 | #endif | |
1575 | ||
1576 | static __init int event_trace_self_tests_init(void) | |
1577 | { | |
020e5f85 LZ |
1578 | if (!tracing_selftest_disabled) { |
1579 | event_trace_self_tests(); | |
1580 | event_trace_self_test_with_function(); | |
1581 | } | |
e6187007 SR |
1582 | |
1583 | return 0; | |
1584 | } | |
1585 | ||
28d20e2d | 1586 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
1587 | |
1588 | #endif |