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 | ||
aeaeae11 FW |
32 | int trace_define_field(struct ftrace_event_call *call, const char *type, |
33 | const char *name, int offset, int size, int is_signed, | |
43b51ead | 34 | int filter_type) |
cf027f64 TZ |
35 | { |
36 | struct ftrace_event_field *field; | |
37 | ||
fe9f57f2 | 38 | field = kzalloc(sizeof(*field), GFP_KERNEL); |
cf027f64 TZ |
39 | if (!field) |
40 | goto err; | |
fe9f57f2 | 41 | |
cf027f64 TZ |
42 | field->name = kstrdup(name, GFP_KERNEL); |
43 | if (!field->name) | |
44 | goto err; | |
fe9f57f2 | 45 | |
cf027f64 TZ |
46 | field->type = kstrdup(type, GFP_KERNEL); |
47 | if (!field->type) | |
48 | goto err; | |
fe9f57f2 | 49 | |
43b51ead LZ |
50 | if (filter_type == FILTER_OTHER) |
51 | field->filter_type = filter_assign_type(type); | |
52 | else | |
53 | field->filter_type = filter_type; | |
54 | ||
cf027f64 TZ |
55 | field->offset = offset; |
56 | field->size = size; | |
a118e4d1 | 57 | field->is_signed = is_signed; |
aa38e9fc | 58 | |
cf027f64 TZ |
59 | list_add(&field->link, &call->fields); |
60 | ||
61 | return 0; | |
fe9f57f2 | 62 | |
cf027f64 | 63 | err: |
7b60997f | 64 | if (field) |
cf027f64 | 65 | kfree(field->name); |
cf027f64 | 66 | kfree(field); |
fe9f57f2 | 67 | |
cf027f64 TZ |
68 | return -ENOMEM; |
69 | } | |
17c873ec | 70 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 71 | |
e647d6b3 LZ |
72 | #define __common_field(type, item) \ |
73 | ret = trace_define_field(call, #type, "common_" #item, \ | |
74 | offsetof(typeof(ent), item), \ | |
75 | sizeof(ent.item), \ | |
43b51ead | 76 | is_signed_type(type), FILTER_OTHER); \ |
e647d6b3 LZ |
77 | if (ret) \ |
78 | return ret; | |
79 | ||
614a71a2 | 80 | static int trace_define_common_fields(struct ftrace_event_call *call) |
e647d6b3 LZ |
81 | { |
82 | int ret; | |
83 | struct trace_entry ent; | |
84 | ||
85 | __common_field(unsigned short, type); | |
86 | __common_field(unsigned char, flags); | |
87 | __common_field(unsigned char, preempt_count); | |
88 | __common_field(int, pid); | |
637e7e86 | 89 | __common_field(int, lock_depth); |
e647d6b3 LZ |
90 | |
91 | return ret; | |
92 | } | |
93 | ||
bd1a5c84 | 94 | void trace_destroy_fields(struct ftrace_event_call *call) |
2df75e41 LZ |
95 | { |
96 | struct ftrace_event_field *field, *next; | |
97 | ||
98 | list_for_each_entry_safe(field, next, &call->fields, link) { | |
99 | list_del(&field->link); | |
100 | kfree(field->type); | |
101 | kfree(field->name); | |
102 | kfree(field); | |
103 | } | |
104 | } | |
105 | ||
87d9b4e1 LZ |
106 | int trace_event_raw_init(struct ftrace_event_call *call) |
107 | { | |
108 | int id; | |
109 | ||
110 | id = register_ftrace_event(call->event); | |
111 | if (!id) | |
112 | return -ENODEV; | |
113 | call->id = id; | |
114 | INIT_LIST_HEAD(&call->fields); | |
115 | ||
116 | return 0; | |
117 | } | |
118 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
119 | ||
3b8e4273 | 120 | static int ftrace_event_enable_disable(struct ftrace_event_call *call, |
fd994989 SR |
121 | int enable) |
122 | { | |
3b8e4273 LZ |
123 | int ret = 0; |
124 | ||
fd994989 SR |
125 | switch (enable) { |
126 | case 0: | |
127 | if (call->enabled) { | |
128 | call->enabled = 0; | |
b11c53e1 | 129 | tracing_stop_cmdline_record(); |
bd1a5c84 | 130 | call->unregfunc(call); |
fd994989 | 131 | } |
fd994989 SR |
132 | break; |
133 | case 1: | |
da4d0302 | 134 | if (!call->enabled) { |
b11c53e1 | 135 | tracing_start_cmdline_record(); |
3b8e4273 LZ |
136 | ret = call->regfunc(call); |
137 | if (ret) { | |
138 | tracing_stop_cmdline_record(); | |
139 | pr_info("event trace: Could not enable event " | |
140 | "%s\n", call->name); | |
141 | break; | |
142 | } | |
143 | call->enabled = 1; | |
fd994989 | 144 | } |
fd994989 SR |
145 | break; |
146 | } | |
3b8e4273 LZ |
147 | |
148 | return ret; | |
fd994989 SR |
149 | } |
150 | ||
0e907c99 Z |
151 | static void ftrace_clear_events(void) |
152 | { | |
153 | struct ftrace_event_call *call; | |
154 | ||
155 | mutex_lock(&event_mutex); | |
156 | list_for_each_entry(call, &ftrace_events, list) { | |
157 | ftrace_event_enable_disable(call, 0); | |
158 | } | |
159 | mutex_unlock(&event_mutex); | |
160 | } | |
161 | ||
8f31bfe5 LZ |
162 | /* |
163 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
164 | */ | |
165 | static int __ftrace_set_clr_event(const char *match, const char *sub, | |
166 | const char *event, int set) | |
b77e38aa | 167 | { |
a59fd602 | 168 | struct ftrace_event_call *call; |
29f93943 | 169 | int ret = -EINVAL; |
8f31bfe5 LZ |
170 | |
171 | mutex_lock(&event_mutex); | |
172 | list_for_each_entry(call, &ftrace_events, list) { | |
173 | ||
174 | if (!call->name || !call->regfunc) | |
175 | continue; | |
176 | ||
177 | if (match && | |
178 | strcmp(match, call->name) != 0 && | |
179 | strcmp(match, call->system) != 0) | |
180 | continue; | |
181 | ||
182 | if (sub && strcmp(sub, call->system) != 0) | |
183 | continue; | |
184 | ||
185 | if (event && strcmp(event, call->name) != 0) | |
186 | continue; | |
187 | ||
188 | ftrace_event_enable_disable(call, set); | |
189 | ||
190 | ret = 0; | |
191 | } | |
192 | mutex_unlock(&event_mutex); | |
193 | ||
194 | return ret; | |
195 | } | |
196 | ||
197 | static int ftrace_set_clr_event(char *buf, int set) | |
198 | { | |
b628b3e6 | 199 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
200 | |
201 | /* | |
202 | * The buf format can be <subsystem>:<event-name> | |
203 | * *:<event-name> means any event by that name. | |
204 | * :<event-name> is the same. | |
205 | * | |
206 | * <subsystem>:* means all events in that subsystem | |
207 | * <subsystem>: means the same. | |
208 | * | |
209 | * <name> (no ':') means all events in a subsystem with | |
210 | * the name <name> or any event that matches <name> | |
211 | */ | |
212 | ||
213 | match = strsep(&buf, ":"); | |
214 | if (buf) { | |
215 | sub = match; | |
216 | event = buf; | |
217 | match = NULL; | |
218 | ||
219 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
220 | sub = NULL; | |
221 | if (!strlen(event) || strcmp(event, "*") == 0) | |
222 | event = NULL; | |
223 | } | |
b77e38aa | 224 | |
8f31bfe5 | 225 | return __ftrace_set_clr_event(match, sub, event, set); |
b77e38aa SR |
226 | } |
227 | ||
4671c794 SR |
228 | /** |
229 | * trace_set_clr_event - enable or disable an event | |
230 | * @system: system name to match (NULL for any system) | |
231 | * @event: event name to match (NULL for all events, within system) | |
232 | * @set: 1 to enable, 0 to disable | |
233 | * | |
234 | * This is a way for other parts of the kernel to enable or disable | |
235 | * event recording. | |
236 | * | |
237 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
238 | * registered events. | |
239 | */ | |
240 | int trace_set_clr_event(const char *system, const char *event, int set) | |
241 | { | |
242 | return __ftrace_set_clr_event(NULL, system, event, set); | |
243 | } | |
244 | ||
b77e38aa SR |
245 | /* 128 should be much more than enough */ |
246 | #define EVENT_BUF_SIZE 127 | |
247 | ||
248 | static ssize_t | |
249 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
250 | size_t cnt, loff_t *ppos) | |
251 | { | |
48966364 | 252 | struct trace_parser parser; |
4ba7978e | 253 | ssize_t read, ret; |
b77e38aa | 254 | |
4ba7978e | 255 | if (!cnt) |
b77e38aa SR |
256 | return 0; |
257 | ||
1852fcce SR |
258 | ret = tracing_update_buffers(); |
259 | if (ret < 0) | |
260 | return ret; | |
261 | ||
48966364 | 262 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
263 | return -ENOMEM; |
264 | ||
48966364 | 265 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
266 | ||
4ba7978e | 267 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 268 | int set = 1; |
b77e38aa | 269 | |
48966364 | 270 | if (*parser.buffer == '!') |
b77e38aa | 271 | set = 0; |
b77e38aa | 272 | |
48966364 | 273 | parser.buffer[parser.idx] = 0; |
274 | ||
275 | ret = ftrace_set_clr_event(parser.buffer + !set, set); | |
b77e38aa | 276 | if (ret) |
48966364 | 277 | goto out_put; |
b77e38aa | 278 | } |
b77e38aa SR |
279 | |
280 | ret = read; | |
281 | ||
48966364 | 282 | out_put: |
283 | trace_parser_put(&parser); | |
b77e38aa SR |
284 | |
285 | return ret; | |
286 | } | |
287 | ||
288 | static void * | |
289 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
290 | { | |
30bd39cd | 291 | struct ftrace_event_call *call = v; |
b77e38aa SR |
292 | |
293 | (*pos)++; | |
294 | ||
30bd39cd | 295 | list_for_each_entry_continue(call, &ftrace_events, list) { |
40e26815 SR |
296 | /* |
297 | * The ftrace subsystem is for showing formats only. | |
298 | * They can not be enabled or disabled via the event files. | |
299 | */ | |
300 | if (call->regfunc) | |
30bd39cd | 301 | return call; |
40e26815 | 302 | } |
b77e38aa | 303 | |
30bd39cd | 304 | return NULL; |
b77e38aa SR |
305 | } |
306 | ||
307 | static void *t_start(struct seq_file *m, loff_t *pos) | |
308 | { | |
30bd39cd | 309 | struct ftrace_event_call *call; |
e1c7e2a6 LZ |
310 | loff_t l; |
311 | ||
20c8928a | 312 | mutex_lock(&event_mutex); |
e1c7e2a6 | 313 | |
30bd39cd | 314 | call = list_entry(&ftrace_events, struct ftrace_event_call, list); |
e1c7e2a6 | 315 | for (l = 0; l <= *pos; ) { |
30bd39cd | 316 | call = t_next(m, call, &l); |
e1c7e2a6 LZ |
317 | if (!call) |
318 | break; | |
319 | } | |
320 | return call; | |
b77e38aa SR |
321 | } |
322 | ||
323 | static void * | |
324 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
325 | { | |
30bd39cd | 326 | struct ftrace_event_call *call = v; |
b77e38aa SR |
327 | |
328 | (*pos)++; | |
329 | ||
30bd39cd LZ |
330 | list_for_each_entry_continue(call, &ftrace_events, list) { |
331 | if (call->enabled) | |
332 | return call; | |
b77e38aa SR |
333 | } |
334 | ||
30bd39cd | 335 | return NULL; |
b77e38aa SR |
336 | } |
337 | ||
338 | static void *s_start(struct seq_file *m, loff_t *pos) | |
339 | { | |
30bd39cd | 340 | struct ftrace_event_call *call; |
e1c7e2a6 LZ |
341 | loff_t l; |
342 | ||
20c8928a | 343 | mutex_lock(&event_mutex); |
e1c7e2a6 | 344 | |
30bd39cd | 345 | call = list_entry(&ftrace_events, struct ftrace_event_call, list); |
e1c7e2a6 | 346 | for (l = 0; l <= *pos; ) { |
30bd39cd | 347 | call = s_next(m, call, &l); |
e1c7e2a6 LZ |
348 | if (!call) |
349 | break; | |
350 | } | |
351 | return call; | |
b77e38aa SR |
352 | } |
353 | ||
354 | static int t_show(struct seq_file *m, void *v) | |
355 | { | |
356 | struct ftrace_event_call *call = v; | |
357 | ||
b628b3e6 SR |
358 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
359 | seq_printf(m, "%s:", call->system); | |
b77e38aa SR |
360 | seq_printf(m, "%s\n", call->name); |
361 | ||
362 | return 0; | |
363 | } | |
364 | ||
365 | static void t_stop(struct seq_file *m, void *p) | |
366 | { | |
20c8928a | 367 | mutex_unlock(&event_mutex); |
b77e38aa SR |
368 | } |
369 | ||
370 | static int | |
371 | ftrace_event_seq_open(struct inode *inode, struct file *file) | |
372 | { | |
b77e38aa SR |
373 | const struct seq_operations *seq_ops; |
374 | ||
375 | if ((file->f_mode & FMODE_WRITE) && | |
8650ae32 | 376 | (file->f_flags & O_TRUNC)) |
b77e38aa SR |
377 | ftrace_clear_events(); |
378 | ||
379 | seq_ops = inode->i_private; | |
20c8928a | 380 | return seq_open(file, seq_ops); |
b77e38aa SR |
381 | } |
382 | ||
1473e441 SR |
383 | static ssize_t |
384 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
385 | loff_t *ppos) | |
386 | { | |
387 | struct ftrace_event_call *call = filp->private_data; | |
388 | char *buf; | |
389 | ||
da4d0302 | 390 | if (call->enabled) |
1473e441 SR |
391 | buf = "1\n"; |
392 | else | |
393 | buf = "0\n"; | |
394 | ||
395 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
396 | } | |
397 | ||
398 | static ssize_t | |
399 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
400 | loff_t *ppos) | |
401 | { | |
402 | struct ftrace_event_call *call = filp->private_data; | |
403 | char buf[64]; | |
404 | unsigned long val; | |
405 | int ret; | |
406 | ||
407 | if (cnt >= sizeof(buf)) | |
408 | return -EINVAL; | |
409 | ||
410 | if (copy_from_user(&buf, ubuf, cnt)) | |
411 | return -EFAULT; | |
412 | ||
413 | buf[cnt] = 0; | |
414 | ||
415 | ret = strict_strtoul(buf, 10, &val); | |
416 | if (ret < 0) | |
417 | return ret; | |
418 | ||
1852fcce SR |
419 | ret = tracing_update_buffers(); |
420 | if (ret < 0) | |
421 | return ret; | |
422 | ||
1473e441 SR |
423 | switch (val) { |
424 | case 0: | |
1473e441 | 425 | case 1: |
11a241a3 | 426 | mutex_lock(&event_mutex); |
3b8e4273 | 427 | ret = ftrace_event_enable_disable(call, val); |
11a241a3 | 428 | mutex_unlock(&event_mutex); |
1473e441 SR |
429 | break; |
430 | ||
431 | default: | |
432 | return -EINVAL; | |
433 | } | |
434 | ||
435 | *ppos += cnt; | |
436 | ||
3b8e4273 | 437 | return ret ? ret : cnt; |
1473e441 SR |
438 | } |
439 | ||
8ae79a13 SR |
440 | static ssize_t |
441 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
442 | loff_t *ppos) | |
443 | { | |
c142b15d | 444 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
8ae79a13 SR |
445 | const char *system = filp->private_data; |
446 | struct ftrace_event_call *call; | |
447 | char buf[2]; | |
c142b15d | 448 | int set = 0; |
8ae79a13 SR |
449 | int ret; |
450 | ||
8ae79a13 SR |
451 | mutex_lock(&event_mutex); |
452 | list_for_each_entry(call, &ftrace_events, list) { | |
453 | if (!call->name || !call->regfunc) | |
454 | continue; | |
455 | ||
8f31bfe5 | 456 | if (system && strcmp(call->system, system) != 0) |
8ae79a13 SR |
457 | continue; |
458 | ||
459 | /* | |
460 | * We need to find out if all the events are set | |
461 | * or if all events or cleared, or if we have | |
462 | * a mixture. | |
463 | */ | |
c142b15d LZ |
464 | set |= (1 << !!call->enabled); |
465 | ||
8ae79a13 SR |
466 | /* |
467 | * If we have a mixture, no need to look further. | |
468 | */ | |
c142b15d | 469 | if (set == 3) |
8ae79a13 SR |
470 | break; |
471 | } | |
472 | mutex_unlock(&event_mutex); | |
473 | ||
c142b15d | 474 | buf[0] = set_to_char[set]; |
8ae79a13 | 475 | buf[1] = '\n'; |
8ae79a13 SR |
476 | |
477 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
478 | ||
479 | return ret; | |
480 | } | |
481 | ||
482 | static ssize_t | |
483 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
484 | loff_t *ppos) | |
485 | { | |
486 | const char *system = filp->private_data; | |
487 | unsigned long val; | |
8ae79a13 SR |
488 | char buf[64]; |
489 | ssize_t ret; | |
490 | ||
491 | if (cnt >= sizeof(buf)) | |
492 | return -EINVAL; | |
493 | ||
494 | if (copy_from_user(&buf, ubuf, cnt)) | |
495 | return -EFAULT; | |
496 | ||
497 | buf[cnt] = 0; | |
498 | ||
499 | ret = strict_strtoul(buf, 10, &val); | |
500 | if (ret < 0) | |
501 | return ret; | |
502 | ||
503 | ret = tracing_update_buffers(); | |
504 | if (ret < 0) | |
505 | return ret; | |
506 | ||
8f31bfe5 | 507 | if (val != 0 && val != 1) |
8ae79a13 | 508 | return -EINVAL; |
8ae79a13 | 509 | |
8f31bfe5 | 510 | ret = __ftrace_set_clr_event(NULL, system, NULL, val); |
8ae79a13 | 511 | if (ret) |
8f31bfe5 | 512 | goto out; |
8ae79a13 SR |
513 | |
514 | ret = cnt; | |
515 | ||
8f31bfe5 | 516 | out: |
8ae79a13 SR |
517 | *ppos += cnt; |
518 | ||
519 | return ret; | |
520 | } | |
521 | ||
981d081e SR |
522 | static ssize_t |
523 | event_format_read(struct file *filp, char __user *ubuf, size_t cnt, | |
524 | loff_t *ppos) | |
525 | { | |
526 | struct ftrace_event_call *call = filp->private_data; | |
5a65e956 | 527 | struct ftrace_event_field *field; |
981d081e | 528 | struct trace_seq *s; |
5a65e956 | 529 | int common_field_count = 5; |
981d081e | 530 | char *buf; |
5a65e956 | 531 | int r = 0; |
981d081e | 532 | |
c269fc8c TZ |
533 | if (*ppos) |
534 | return 0; | |
535 | ||
981d081e SR |
536 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
537 | if (!s) | |
538 | return -ENOMEM; | |
539 | ||
540 | trace_seq_init(s); | |
541 | ||
c5e4e192 SR |
542 | trace_seq_printf(s, "name: %s\n", call->name); |
543 | trace_seq_printf(s, "ID: %d\n", call->id); | |
544 | trace_seq_printf(s, "format:\n"); | |
91729ef9 | 545 | |
5a65e956 LJ |
546 | list_for_each_entry_reverse(field, &call->fields, link) { |
547 | /* | |
548 | * Smartly shows the array type(except dynamic array). | |
549 | * Normal: | |
550 | * field:TYPE VAR | |
551 | * If TYPE := TYPE[LEN], it is shown: | |
552 | * field:TYPE VAR[LEN] | |
553 | */ | |
554 | const char *array_descriptor = strchr(field->type, '['); | |
555 | ||
556 | if (!strncmp(field->type, "__data_loc", 10)) | |
557 | array_descriptor = NULL; | |
558 | ||
559 | if (!array_descriptor) { | |
560 | r = trace_seq_printf(s, "\tfield:%s %s;\toffset:%u;" | |
561 | "\tsize:%u;\tsigned:%d;\n", | |
562 | field->type, field->name, field->offset, | |
563 | field->size, !!field->is_signed); | |
564 | } else { | |
565 | r = trace_seq_printf(s, "\tfield:%.*s %s%s;\toffset:%u;" | |
566 | "\tsize:%u;\tsigned:%d;\n", | |
567 | (int)(array_descriptor - field->type), | |
568 | field->type, field->name, | |
569 | array_descriptor, field->offset, | |
570 | field->size, !!field->is_signed); | |
571 | } | |
572 | ||
573 | if (--common_field_count == 0) | |
574 | r = trace_seq_printf(s, "\n"); | |
575 | ||
576 | if (!r) | |
577 | break; | |
578 | } | |
579 | ||
580 | if (r) | |
581 | r = trace_seq_printf(s, "\nprint fmt: %s\n", | |
582 | call->print_fmt); | |
583 | ||
981d081e SR |
584 | if (!r) { |
585 | /* | |
586 | * ug! The format output is bigger than a PAGE!! | |
587 | */ | |
588 | buf = "FORMAT TOO BIG\n"; | |
589 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
590 | buf, strlen(buf)); | |
591 | goto out; | |
592 | } | |
593 | ||
594 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
595 | s->buffer, s->len); | |
596 | out: | |
597 | kfree(s); | |
598 | return r; | |
599 | } | |
600 | ||
23725aee PZ |
601 | static ssize_t |
602 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
603 | { | |
604 | struct ftrace_event_call *call = filp->private_data; | |
605 | struct trace_seq *s; | |
606 | int r; | |
607 | ||
608 | if (*ppos) | |
609 | return 0; | |
610 | ||
611 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
612 | if (!s) | |
613 | return -ENOMEM; | |
614 | ||
615 | trace_seq_init(s); | |
616 | trace_seq_printf(s, "%d\n", call->id); | |
617 | ||
618 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
619 | s->buffer, s->len); | |
620 | kfree(s); | |
621 | return r; | |
622 | } | |
623 | ||
7ce7e424 TZ |
624 | static ssize_t |
625 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
626 | loff_t *ppos) | |
627 | { | |
628 | struct ftrace_event_call *call = filp->private_data; | |
629 | struct trace_seq *s; | |
630 | int r; | |
631 | ||
632 | if (*ppos) | |
633 | return 0; | |
634 | ||
635 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
636 | if (!s) | |
637 | return -ENOMEM; | |
638 | ||
639 | trace_seq_init(s); | |
640 | ||
8b372562 | 641 | print_event_filter(call, s); |
4bda2d51 | 642 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
643 | |
644 | kfree(s); | |
645 | ||
646 | return r; | |
647 | } | |
648 | ||
649 | static ssize_t | |
650 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
651 | loff_t *ppos) | |
652 | { | |
653 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 654 | char *buf; |
7ce7e424 TZ |
655 | int err; |
656 | ||
8b372562 | 657 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
658 | return -EINVAL; |
659 | ||
8b372562 TZ |
660 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
661 | if (!buf) | |
7ce7e424 TZ |
662 | return -ENOMEM; |
663 | ||
8b372562 TZ |
664 | if (copy_from_user(buf, ubuf, cnt)) { |
665 | free_page((unsigned long) buf); | |
666 | return -EFAULT; | |
7ce7e424 | 667 | } |
8b372562 | 668 | buf[cnt] = '\0'; |
7ce7e424 | 669 | |
8b372562 TZ |
670 | err = apply_event_filter(call, buf); |
671 | free_page((unsigned long) buf); | |
672 | if (err < 0) | |
44e9c8b7 | 673 | return err; |
0a19e53c | 674 | |
7ce7e424 TZ |
675 | *ppos += cnt; |
676 | ||
677 | return cnt; | |
678 | } | |
679 | ||
cfb180f3 TZ |
680 | static ssize_t |
681 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
682 | loff_t *ppos) | |
683 | { | |
684 | struct event_subsystem *system = filp->private_data; | |
685 | struct trace_seq *s; | |
686 | int r; | |
687 | ||
688 | if (*ppos) | |
689 | return 0; | |
690 | ||
691 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
692 | if (!s) | |
693 | return -ENOMEM; | |
694 | ||
695 | trace_seq_init(s); | |
696 | ||
8b372562 | 697 | print_subsystem_event_filter(system, s); |
4bda2d51 | 698 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
699 | |
700 | kfree(s); | |
701 | ||
702 | return r; | |
703 | } | |
704 | ||
705 | static ssize_t | |
706 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
707 | loff_t *ppos) | |
708 | { | |
709 | struct event_subsystem *system = filp->private_data; | |
8b372562 | 710 | char *buf; |
cfb180f3 TZ |
711 | int err; |
712 | ||
8b372562 | 713 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
714 | return -EINVAL; |
715 | ||
8b372562 TZ |
716 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
717 | if (!buf) | |
cfb180f3 TZ |
718 | return -ENOMEM; |
719 | ||
8b372562 TZ |
720 | if (copy_from_user(buf, ubuf, cnt)) { |
721 | free_page((unsigned long) buf); | |
722 | return -EFAULT; | |
cfb180f3 | 723 | } |
8b372562 | 724 | buf[cnt] = '\0'; |
cfb180f3 | 725 | |
8b372562 TZ |
726 | err = apply_subsystem_event_filter(system, buf); |
727 | free_page((unsigned long) buf); | |
728 | if (err < 0) | |
44e9c8b7 | 729 | return err; |
cfb180f3 TZ |
730 | |
731 | *ppos += cnt; | |
732 | ||
733 | return cnt; | |
734 | } | |
735 | ||
d1b182a8 SR |
736 | static ssize_t |
737 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
738 | { | |
739 | int (*func)(struct trace_seq *s) = filp->private_data; | |
740 | struct trace_seq *s; | |
741 | int r; | |
742 | ||
743 | if (*ppos) | |
744 | return 0; | |
745 | ||
746 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
747 | if (!s) | |
748 | return -ENOMEM; | |
749 | ||
750 | trace_seq_init(s); | |
751 | ||
752 | func(s); | |
753 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
754 | ||
755 | kfree(s); | |
756 | ||
757 | return r; | |
758 | } | |
759 | ||
b77e38aa SR |
760 | static const struct seq_operations show_event_seq_ops = { |
761 | .start = t_start, | |
762 | .next = t_next, | |
763 | .show = t_show, | |
764 | .stop = t_stop, | |
765 | }; | |
766 | ||
767 | static const struct seq_operations show_set_event_seq_ops = { | |
768 | .start = s_start, | |
769 | .next = s_next, | |
770 | .show = t_show, | |
771 | .stop = t_stop, | |
772 | }; | |
773 | ||
2314c4ae SR |
774 | static const struct file_operations ftrace_avail_fops = { |
775 | .open = ftrace_event_seq_open, | |
776 | .read = seq_read, | |
777 | .llseek = seq_lseek, | |
778 | .release = seq_release, | |
779 | }; | |
780 | ||
b77e38aa SR |
781 | static const struct file_operations ftrace_set_event_fops = { |
782 | .open = ftrace_event_seq_open, | |
783 | .read = seq_read, | |
784 | .write = ftrace_event_write, | |
785 | .llseek = seq_lseek, | |
786 | .release = seq_release, | |
787 | }; | |
788 | ||
1473e441 SR |
789 | static const struct file_operations ftrace_enable_fops = { |
790 | .open = tracing_open_generic, | |
791 | .read = event_enable_read, | |
792 | .write = event_enable_write, | |
793 | }; | |
794 | ||
981d081e SR |
795 | static const struct file_operations ftrace_event_format_fops = { |
796 | .open = tracing_open_generic, | |
797 | .read = event_format_read, | |
798 | }; | |
799 | ||
23725aee PZ |
800 | static const struct file_operations ftrace_event_id_fops = { |
801 | .open = tracing_open_generic, | |
802 | .read = event_id_read, | |
803 | }; | |
804 | ||
7ce7e424 TZ |
805 | static const struct file_operations ftrace_event_filter_fops = { |
806 | .open = tracing_open_generic, | |
807 | .read = event_filter_read, | |
808 | .write = event_filter_write, | |
809 | }; | |
810 | ||
cfb180f3 TZ |
811 | static const struct file_operations ftrace_subsystem_filter_fops = { |
812 | .open = tracing_open_generic, | |
813 | .read = subsystem_filter_read, | |
814 | .write = subsystem_filter_write, | |
815 | }; | |
816 | ||
8ae79a13 SR |
817 | static const struct file_operations ftrace_system_enable_fops = { |
818 | .open = tracing_open_generic, | |
819 | .read = system_enable_read, | |
820 | .write = system_enable_write, | |
821 | }; | |
822 | ||
d1b182a8 SR |
823 | static const struct file_operations ftrace_show_header_fops = { |
824 | .open = tracing_open_generic, | |
825 | .read = show_header, | |
826 | }; | |
827 | ||
1473e441 SR |
828 | static struct dentry *event_trace_events_dir(void) |
829 | { | |
830 | static struct dentry *d_tracer; | |
831 | static struct dentry *d_events; | |
832 | ||
833 | if (d_events) | |
834 | return d_events; | |
835 | ||
836 | d_tracer = tracing_init_dentry(); | |
837 | if (!d_tracer) | |
838 | return NULL; | |
839 | ||
840 | d_events = debugfs_create_dir("events", d_tracer); | |
841 | if (!d_events) | |
842 | pr_warning("Could not create debugfs " | |
843 | "'events' directory\n"); | |
844 | ||
845 | return d_events; | |
846 | } | |
847 | ||
6ecc2d1c SR |
848 | static LIST_HEAD(event_subsystems); |
849 | ||
850 | static struct dentry * | |
851 | event_subsystem_dir(const char *name, struct dentry *d_events) | |
852 | { | |
853 | struct event_subsystem *system; | |
e1112b4d | 854 | struct dentry *entry; |
6ecc2d1c SR |
855 | |
856 | /* First see if we did not already create this dir */ | |
857 | list_for_each_entry(system, &event_subsystems, list) { | |
dc82ec98 XG |
858 | if (strcmp(system->name, name) == 0) { |
859 | system->nr_events++; | |
6ecc2d1c | 860 | return system->entry; |
dc82ec98 | 861 | } |
6ecc2d1c SR |
862 | } |
863 | ||
864 | /* need to create new entry */ | |
865 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
866 | if (!system) { | |
867 | pr_warning("No memory to create event subsystem %s\n", | |
868 | name); | |
869 | return d_events; | |
870 | } | |
871 | ||
872 | system->entry = debugfs_create_dir(name, d_events); | |
873 | if (!system->entry) { | |
874 | pr_warning("Could not create event subsystem %s\n", | |
875 | name); | |
876 | kfree(system); | |
877 | return d_events; | |
878 | } | |
879 | ||
dc82ec98 | 880 | system->nr_events = 1; |
6d723736 SR |
881 | system->name = kstrdup(name, GFP_KERNEL); |
882 | if (!system->name) { | |
883 | debugfs_remove(system->entry); | |
884 | kfree(system); | |
885 | return d_events; | |
886 | } | |
887 | ||
6ecc2d1c SR |
888 | list_add(&system->list, &event_subsystems); |
889 | ||
30e673b2 | 890 | system->filter = NULL; |
cfb180f3 | 891 | |
8b372562 TZ |
892 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
893 | if (!system->filter) { | |
894 | pr_warning("Could not allocate filter for subsystem " | |
895 | "'%s'\n", name); | |
896 | return system->entry; | |
897 | } | |
898 | ||
e1112b4d TZ |
899 | entry = debugfs_create_file("filter", 0644, system->entry, system, |
900 | &ftrace_subsystem_filter_fops); | |
8b372562 TZ |
901 | if (!entry) { |
902 | kfree(system->filter); | |
903 | system->filter = NULL; | |
e1112b4d TZ |
904 | pr_warning("Could not create debugfs " |
905 | "'%s/filter' entry\n", name); | |
8b372562 | 906 | } |
e1112b4d | 907 | |
f3f3f009 FW |
908 | trace_create_file("enable", 0644, system->entry, |
909 | (void *)system->name, | |
910 | &ftrace_system_enable_fops); | |
8ae79a13 | 911 | |
6ecc2d1c SR |
912 | return system->entry; |
913 | } | |
914 | ||
1473e441 | 915 | static int |
701970b3 SR |
916 | event_create_dir(struct ftrace_event_call *call, struct dentry *d_events, |
917 | const struct file_operations *id, | |
918 | const struct file_operations *enable, | |
919 | const struct file_operations *filter, | |
920 | const struct file_operations *format) | |
1473e441 | 921 | { |
fd994989 | 922 | int ret; |
1473e441 | 923 | |
6ecc2d1c SR |
924 | /* |
925 | * If the trace point header did not define TRACE_SYSTEM | |
926 | * then the system would be called "TRACE_SYSTEM". | |
927 | */ | |
6d723736 | 928 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
6ecc2d1c SR |
929 | d_events = event_subsystem_dir(call->system, d_events); |
930 | ||
1473e441 SR |
931 | call->dir = debugfs_create_dir(call->name, d_events); |
932 | if (!call->dir) { | |
933 | pr_warning("Could not create debugfs " | |
934 | "'%s' directory\n", call->name); | |
935 | return -1; | |
936 | } | |
937 | ||
6d723736 | 938 | if (call->regfunc) |
f3f3f009 FW |
939 | trace_create_file("enable", 0644, call->dir, call, |
940 | enable); | |
1473e441 | 941 | |
97d5a220 | 942 | if (call->id && call->perf_event_enable) |
f3f3f009 FW |
943 | trace_create_file("id", 0444, call->dir, call, |
944 | id); | |
23725aee | 945 | |
cf027f64 | 946 | if (call->define_fields) { |
614a71a2 LZ |
947 | ret = trace_define_common_fields(call); |
948 | if (!ret) | |
949 | ret = call->define_fields(call); | |
cf027f64 TZ |
950 | if (ret < 0) { |
951 | pr_warning("Could not initialize trace point" | |
952 | " events/%s\n", call->name); | |
953 | return ret; | |
954 | } | |
f3f3f009 FW |
955 | trace_create_file("filter", 0644, call->dir, call, |
956 | filter); | |
cf027f64 TZ |
957 | } |
958 | ||
f3f3f009 FW |
959 | trace_create_file("format", 0444, call->dir, call, |
960 | format); | |
6d723736 SR |
961 | |
962 | return 0; | |
963 | } | |
964 | ||
bd1a5c84 MH |
965 | static int __trace_add_event_call(struct ftrace_event_call *call) |
966 | { | |
967 | struct dentry *d_events; | |
968 | int ret; | |
6d723736 | 969 | |
bd1a5c84 MH |
970 | if (!call->name) |
971 | return -EINVAL; | |
701970b3 | 972 | |
bd1a5c84 MH |
973 | if (call->raw_init) { |
974 | ret = call->raw_init(call); | |
975 | if (ret < 0) { | |
976 | if (ret != -ENOSYS) | |
977 | pr_warning("Could not initialize trace " | |
978 | "events/%s\n", call->name); | |
979 | return ret; | |
980 | } | |
981 | } | |
701970b3 | 982 | |
bd1a5c84 MH |
983 | d_events = event_trace_events_dir(); |
984 | if (!d_events) | |
985 | return -ENOENT; | |
986 | ||
588bebb7 | 987 | ret = event_create_dir(call, d_events, &ftrace_event_id_fops, |
bd1a5c84 MH |
988 | &ftrace_enable_fops, &ftrace_event_filter_fops, |
989 | &ftrace_event_format_fops); | |
88f70d75 MH |
990 | if (!ret) |
991 | list_add(&call->list, &ftrace_events); | |
992 | ||
588bebb7 | 993 | return ret; |
bd1a5c84 MH |
994 | } |
995 | ||
996 | /* Add an additional event_call dynamically */ | |
997 | int trace_add_event_call(struct ftrace_event_call *call) | |
998 | { | |
999 | int ret; | |
1000 | mutex_lock(&event_mutex); | |
1001 | ret = __trace_add_event_call(call); | |
1002 | mutex_unlock(&event_mutex); | |
1003 | return ret; | |
1004 | } | |
701970b3 | 1005 | |
a2ca5e03 FW |
1006 | static void remove_subsystem_dir(const char *name) |
1007 | { | |
1008 | struct event_subsystem *system; | |
1009 | ||
1010 | if (strcmp(name, TRACE_SYSTEM) == 0) | |
1011 | return; | |
1012 | ||
1013 | list_for_each_entry(system, &event_subsystems, list) { | |
1014 | if (strcmp(system->name, name) == 0) { | |
1015 | if (!--system->nr_events) { | |
1016 | struct event_filter *filter = system->filter; | |
1017 | ||
1018 | debugfs_remove_recursive(system->entry); | |
1019 | list_del(&system->list); | |
1020 | if (filter) { | |
1021 | kfree(filter->filter_string); | |
1022 | kfree(filter); | |
1023 | } | |
1024 | kfree(system->name); | |
1025 | kfree(system); | |
1026 | } | |
1027 | break; | |
1028 | } | |
1029 | } | |
1030 | } | |
1031 | ||
4fead8e4 MH |
1032 | /* |
1033 | * Must be called under locking both of event_mutex and trace_event_mutex. | |
1034 | */ | |
bd1a5c84 MH |
1035 | static void __trace_remove_event_call(struct ftrace_event_call *call) |
1036 | { | |
1037 | ftrace_event_enable_disable(call, 0); | |
1038 | if (call->event) | |
1039 | __unregister_ftrace_event(call->event); | |
1040 | debugfs_remove_recursive(call->dir); | |
1041 | list_del(&call->list); | |
1042 | trace_destroy_fields(call); | |
1043 | destroy_preds(call); | |
1044 | remove_subsystem_dir(call->system); | |
1045 | } | |
1046 | ||
1047 | /* Remove an event_call */ | |
1048 | void trace_remove_event_call(struct ftrace_event_call *call) | |
1049 | { | |
1050 | mutex_lock(&event_mutex); | |
4fead8e4 | 1051 | down_write(&trace_event_mutex); |
bd1a5c84 | 1052 | __trace_remove_event_call(call); |
4fead8e4 | 1053 | up_write(&trace_event_mutex); |
bd1a5c84 MH |
1054 | mutex_unlock(&event_mutex); |
1055 | } | |
1056 | ||
1057 | #define for_each_event(event, start, end) \ | |
1058 | for (event = start; \ | |
1059 | (unsigned long)event < (unsigned long)end; \ | |
1060 | event++) | |
1061 | ||
1062 | #ifdef CONFIG_MODULES | |
1063 | ||
1064 | static LIST_HEAD(ftrace_module_file_list); | |
1065 | ||
1066 | /* | |
1067 | * Modules must own their file_operations to keep up with | |
1068 | * reference counting. | |
1069 | */ | |
1070 | struct ftrace_module_file_ops { | |
1071 | struct list_head list; | |
1072 | struct module *mod; | |
1073 | struct file_operations id; | |
1074 | struct file_operations enable; | |
1075 | struct file_operations format; | |
1076 | struct file_operations filter; | |
1077 | }; | |
1078 | ||
701970b3 SR |
1079 | static struct ftrace_module_file_ops * |
1080 | trace_create_file_ops(struct module *mod) | |
1081 | { | |
1082 | struct ftrace_module_file_ops *file_ops; | |
1083 | ||
1084 | /* | |
1085 | * This is a bit of a PITA. To allow for correct reference | |
1086 | * counting, modules must "own" their file_operations. | |
1087 | * To do this, we allocate the file operations that will be | |
1088 | * used in the event directory. | |
1089 | */ | |
1090 | ||
1091 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1092 | if (!file_ops) | |
1093 | return NULL; | |
1094 | ||
1095 | file_ops->mod = mod; | |
1096 | ||
1097 | file_ops->id = ftrace_event_id_fops; | |
1098 | file_ops->id.owner = mod; | |
1099 | ||
1100 | file_ops->enable = ftrace_enable_fops; | |
1101 | file_ops->enable.owner = mod; | |
1102 | ||
1103 | file_ops->filter = ftrace_event_filter_fops; | |
1104 | file_ops->filter.owner = mod; | |
1105 | ||
1106 | file_ops->format = ftrace_event_format_fops; | |
1107 | file_ops->format.owner = mod; | |
1108 | ||
1109 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1110 | ||
1111 | return file_ops; | |
1112 | } | |
1113 | ||
6d723736 SR |
1114 | static void trace_module_add_events(struct module *mod) |
1115 | { | |
701970b3 | 1116 | struct ftrace_module_file_ops *file_ops = NULL; |
6d723736 SR |
1117 | struct ftrace_event_call *call, *start, *end; |
1118 | struct dentry *d_events; | |
f744bd57 | 1119 | int ret; |
6d723736 SR |
1120 | |
1121 | start = mod->trace_events; | |
1122 | end = mod->trace_events + mod->num_trace_events; | |
1123 | ||
1124 | if (start == end) | |
1125 | return; | |
1126 | ||
1127 | d_events = event_trace_events_dir(); | |
1128 | if (!d_events) | |
1129 | return; | |
1130 | ||
1131 | for_each_event(call, start, end) { | |
1132 | /* The linker may leave blanks */ | |
1133 | if (!call->name) | |
1134 | continue; | |
f744bd57 | 1135 | if (call->raw_init) { |
bd1a5c84 | 1136 | ret = call->raw_init(call); |
f744bd57 JB |
1137 | if (ret < 0) { |
1138 | if (ret != -ENOSYS) | |
1139 | pr_warning("Could not initialize trace " | |
1140 | "point events/%s\n", call->name); | |
1141 | continue; | |
1142 | } | |
1143 | } | |
701970b3 SR |
1144 | /* |
1145 | * This module has events, create file ops for this module | |
1146 | * if not already done. | |
1147 | */ | |
1148 | if (!file_ops) { | |
1149 | file_ops = trace_create_file_ops(mod); | |
1150 | if (!file_ops) | |
1151 | return; | |
1152 | } | |
6d723736 | 1153 | call->mod = mod; |
88f70d75 MH |
1154 | ret = event_create_dir(call, d_events, |
1155 | &file_ops->id, &file_ops->enable, | |
1156 | &file_ops->filter, &file_ops->format); | |
1157 | if (!ret) | |
1158 | list_add(&call->list, &ftrace_events); | |
6d723736 SR |
1159 | } |
1160 | } | |
1161 | ||
1162 | static void trace_module_remove_events(struct module *mod) | |
1163 | { | |
701970b3 | 1164 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1165 | struct ftrace_event_call *call, *p; |
9456f0fa | 1166 | bool found = false; |
6d723736 | 1167 | |
110bf2b7 | 1168 | down_write(&trace_event_mutex); |
6d723736 SR |
1169 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1170 | if (call->mod == mod) { | |
9456f0fa | 1171 | found = true; |
bd1a5c84 | 1172 | __trace_remove_event_call(call); |
6d723736 SR |
1173 | } |
1174 | } | |
701970b3 SR |
1175 | |
1176 | /* Now free the file_operations */ | |
1177 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1178 | if (file_ops->mod == mod) | |
1179 | break; | |
1180 | } | |
1181 | if (&file_ops->list != &ftrace_module_file_list) { | |
1182 | list_del(&file_ops->list); | |
1183 | kfree(file_ops); | |
1184 | } | |
9456f0fa SR |
1185 | |
1186 | /* | |
1187 | * It is safest to reset the ring buffer if the module being unloaded | |
1188 | * registered any events. | |
1189 | */ | |
1190 | if (found) | |
1191 | tracing_reset_current_online_cpus(); | |
110bf2b7 | 1192 | up_write(&trace_event_mutex); |
6d723736 SR |
1193 | } |
1194 | ||
61f919a1 SR |
1195 | static int trace_module_notify(struct notifier_block *self, |
1196 | unsigned long val, void *data) | |
6d723736 SR |
1197 | { |
1198 | struct module *mod = data; | |
1199 | ||
1200 | mutex_lock(&event_mutex); | |
1201 | switch (val) { | |
1202 | case MODULE_STATE_COMING: | |
1203 | trace_module_add_events(mod); | |
1204 | break; | |
1205 | case MODULE_STATE_GOING: | |
1206 | trace_module_remove_events(mod); | |
1207 | break; | |
1208 | } | |
1209 | mutex_unlock(&event_mutex); | |
fd994989 | 1210 | |
1473e441 SR |
1211 | return 0; |
1212 | } | |
61f919a1 SR |
1213 | #else |
1214 | static int trace_module_notify(struct notifier_block *self, | |
1215 | unsigned long val, void *data) | |
1216 | { | |
1217 | return 0; | |
1218 | } | |
1219 | #endif /* CONFIG_MODULES */ | |
1473e441 | 1220 | |
ec827c7e | 1221 | static struct notifier_block trace_module_nb = { |
6d723736 SR |
1222 | .notifier_call = trace_module_notify, |
1223 | .priority = 0, | |
1224 | }; | |
1225 | ||
a59fd602 SR |
1226 | extern struct ftrace_event_call __start_ftrace_events[]; |
1227 | extern struct ftrace_event_call __stop_ftrace_events[]; | |
1228 | ||
020e5f85 LZ |
1229 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
1230 | ||
1231 | static __init int setup_trace_event(char *str) | |
1232 | { | |
1233 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
1234 | ring_buffer_expanded = 1; | |
1235 | tracing_selftest_disabled = 1; | |
1236 | ||
1237 | return 1; | |
1238 | } | |
1239 | __setup("trace_event=", setup_trace_event); | |
1240 | ||
b77e38aa SR |
1241 | static __init int event_trace_init(void) |
1242 | { | |
a59fd602 | 1243 | struct ftrace_event_call *call; |
b77e38aa SR |
1244 | struct dentry *d_tracer; |
1245 | struct dentry *entry; | |
1473e441 | 1246 | struct dentry *d_events; |
6d723736 | 1247 | int ret; |
020e5f85 LZ |
1248 | char *buf = bootup_event_buf; |
1249 | char *token; | |
b77e38aa SR |
1250 | |
1251 | d_tracer = tracing_init_dentry(); | |
1252 | if (!d_tracer) | |
1253 | return 0; | |
1254 | ||
2314c4ae SR |
1255 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
1256 | (void *)&show_event_seq_ops, | |
1257 | &ftrace_avail_fops); | |
1258 | if (!entry) | |
1259 | pr_warning("Could not create debugfs " | |
1260 | "'available_events' entry\n"); | |
1261 | ||
b77e38aa SR |
1262 | entry = debugfs_create_file("set_event", 0644, d_tracer, |
1263 | (void *)&show_set_event_seq_ops, | |
1264 | &ftrace_set_event_fops); | |
1265 | if (!entry) | |
1266 | pr_warning("Could not create debugfs " | |
1267 | "'set_event' entry\n"); | |
1268 | ||
1473e441 SR |
1269 | d_events = event_trace_events_dir(); |
1270 | if (!d_events) | |
1271 | return 0; | |
1272 | ||
d1b182a8 SR |
1273 | /* ring buffer internal formats */ |
1274 | trace_create_file("header_page", 0444, d_events, | |
1275 | ring_buffer_print_page_header, | |
1276 | &ftrace_show_header_fops); | |
1277 | ||
1278 | trace_create_file("header_event", 0444, d_events, | |
1279 | ring_buffer_print_entry_header, | |
1280 | &ftrace_show_header_fops); | |
1281 | ||
8ae79a13 | 1282 | trace_create_file("enable", 0644, d_events, |
8f31bfe5 | 1283 | NULL, &ftrace_system_enable_fops); |
8ae79a13 | 1284 | |
6d723736 | 1285 | for_each_event(call, __start_ftrace_events, __stop_ftrace_events) { |
1473e441 SR |
1286 | /* The linker may leave blanks */ |
1287 | if (!call->name) | |
1288 | continue; | |
f744bd57 | 1289 | if (call->raw_init) { |
bd1a5c84 | 1290 | ret = call->raw_init(call); |
f744bd57 JB |
1291 | if (ret < 0) { |
1292 | if (ret != -ENOSYS) | |
1293 | pr_warning("Could not initialize trace " | |
1294 | "point events/%s\n", call->name); | |
1295 | continue; | |
1296 | } | |
1297 | } | |
88f70d75 MH |
1298 | ret = event_create_dir(call, d_events, &ftrace_event_id_fops, |
1299 | &ftrace_enable_fops, | |
1300 | &ftrace_event_filter_fops, | |
1301 | &ftrace_event_format_fops); | |
1302 | if (!ret) | |
1303 | list_add(&call->list, &ftrace_events); | |
1473e441 SR |
1304 | } |
1305 | ||
020e5f85 LZ |
1306 | while (true) { |
1307 | token = strsep(&buf, ","); | |
1308 | ||
1309 | if (!token) | |
1310 | break; | |
1311 | if (!*token) | |
1312 | continue; | |
1313 | ||
1314 | ret = ftrace_set_clr_event(token, 1); | |
1315 | if (ret) | |
1316 | pr_warning("Failed to enable trace event: %s\n", token); | |
1317 | } | |
1318 | ||
6d723736 | 1319 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 1320 | if (ret) |
6d723736 SR |
1321 | pr_warning("Failed to register trace events module notifier\n"); |
1322 | ||
b77e38aa SR |
1323 | return 0; |
1324 | } | |
1325 | fs_initcall(event_trace_init); | |
e6187007 SR |
1326 | |
1327 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1328 | ||
1329 | static DEFINE_SPINLOCK(test_spinlock); | |
1330 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
1331 | static DEFINE_MUTEX(test_mutex); | |
1332 | ||
1333 | static __init void test_work(struct work_struct *dummy) | |
1334 | { | |
1335 | spin_lock(&test_spinlock); | |
1336 | spin_lock_irq(&test_spinlock_irq); | |
1337 | udelay(1); | |
1338 | spin_unlock_irq(&test_spinlock_irq); | |
1339 | spin_unlock(&test_spinlock); | |
1340 | ||
1341 | mutex_lock(&test_mutex); | |
1342 | msleep(1); | |
1343 | mutex_unlock(&test_mutex); | |
1344 | } | |
1345 | ||
1346 | static __init int event_test_thread(void *unused) | |
1347 | { | |
1348 | void *test_malloc; | |
1349 | ||
1350 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
1351 | if (!test_malloc) | |
1352 | pr_info("failed to kmalloc\n"); | |
1353 | ||
1354 | schedule_on_each_cpu(test_work); | |
1355 | ||
1356 | kfree(test_malloc); | |
1357 | ||
1358 | set_current_state(TASK_INTERRUPTIBLE); | |
1359 | while (!kthread_should_stop()) | |
1360 | schedule(); | |
1361 | ||
1362 | return 0; | |
1363 | } | |
1364 | ||
1365 | /* | |
1366 | * Do various things that may trigger events. | |
1367 | */ | |
1368 | static __init void event_test_stuff(void) | |
1369 | { | |
1370 | struct task_struct *test_thread; | |
1371 | ||
1372 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
1373 | msleep(1); | |
1374 | kthread_stop(test_thread); | |
1375 | } | |
1376 | ||
1377 | /* | |
1378 | * For every trace event defined, we will test each trace point separately, | |
1379 | * and then by groups, and finally all trace points. | |
1380 | */ | |
9ea21c1e | 1381 | static __init void event_trace_self_tests(void) |
e6187007 SR |
1382 | { |
1383 | struct ftrace_event_call *call; | |
1384 | struct event_subsystem *system; | |
e6187007 SR |
1385 | int ret; |
1386 | ||
1387 | pr_info("Running tests on trace events:\n"); | |
1388 | ||
1389 | list_for_each_entry(call, &ftrace_events, list) { | |
1390 | ||
1391 | /* Only test those that have a regfunc */ | |
1392 | if (!call->regfunc) | |
1393 | continue; | |
1394 | ||
1f5a6b45 SR |
1395 | /* |
1396 | * Testing syscall events here is pretty useless, but | |
1397 | * we still do it if configured. But this is time consuming. | |
1398 | * What we really need is a user thread to perform the | |
1399 | * syscalls as we test. | |
1400 | */ | |
1401 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
1402 | if (call->system && | |
1403 | strcmp(call->system, "syscalls") == 0) | |
1404 | continue; | |
1405 | #endif | |
1406 | ||
e6187007 SR |
1407 | pr_info("Testing event %s: ", call->name); |
1408 | ||
1409 | /* | |
1410 | * If an event is already enabled, someone is using | |
1411 | * it and the self test should not be on. | |
1412 | */ | |
1413 | if (call->enabled) { | |
1414 | pr_warning("Enabled event during self test!\n"); | |
1415 | WARN_ON_ONCE(1); | |
1416 | continue; | |
1417 | } | |
1418 | ||
0e907c99 | 1419 | ftrace_event_enable_disable(call, 1); |
e6187007 | 1420 | event_test_stuff(); |
0e907c99 | 1421 | ftrace_event_enable_disable(call, 0); |
e6187007 SR |
1422 | |
1423 | pr_cont("OK\n"); | |
1424 | } | |
1425 | ||
1426 | /* Now test at the sub system level */ | |
1427 | ||
1428 | pr_info("Running tests on trace event systems:\n"); | |
1429 | ||
1430 | list_for_each_entry(system, &event_subsystems, list) { | |
1431 | ||
1432 | /* the ftrace system is special, skip it */ | |
1433 | if (strcmp(system->name, "ftrace") == 0) | |
1434 | continue; | |
1435 | ||
1436 | pr_info("Testing event system %s: ", system->name); | |
1437 | ||
8f31bfe5 | 1438 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1); |
e6187007 SR |
1439 | if (WARN_ON_ONCE(ret)) { |
1440 | pr_warning("error enabling system %s\n", | |
1441 | system->name); | |
1442 | continue; | |
1443 | } | |
1444 | ||
1445 | event_test_stuff(); | |
1446 | ||
8f31bfe5 | 1447 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0); |
e6187007 SR |
1448 | if (WARN_ON_ONCE(ret)) |
1449 | pr_warning("error disabling system %s\n", | |
1450 | system->name); | |
1451 | ||
1452 | pr_cont("OK\n"); | |
1453 | } | |
1454 | ||
1455 | /* Test with all events enabled */ | |
1456 | ||
1457 | pr_info("Running tests on all trace events:\n"); | |
1458 | pr_info("Testing all events: "); | |
1459 | ||
8f31bfe5 | 1460 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1); |
e6187007 | 1461 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 1462 | pr_warning("error enabling all events\n"); |
9ea21c1e | 1463 | return; |
e6187007 SR |
1464 | } |
1465 | ||
1466 | event_test_stuff(); | |
1467 | ||
1468 | /* reset sysname */ | |
8f31bfe5 | 1469 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0); |
e6187007 SR |
1470 | if (WARN_ON_ONCE(ret)) { |
1471 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 1472 | return; |
e6187007 SR |
1473 | } |
1474 | ||
1475 | pr_cont("OK\n"); | |
9ea21c1e SR |
1476 | } |
1477 | ||
1478 | #ifdef CONFIG_FUNCTION_TRACER | |
1479 | ||
245b2e70 | 1480 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e SR |
1481 | |
1482 | static void | |
1483 | function_test_events_call(unsigned long ip, unsigned long parent_ip) | |
1484 | { | |
1485 | struct ring_buffer_event *event; | |
e77405ad | 1486 | struct ring_buffer *buffer; |
9ea21c1e SR |
1487 | struct ftrace_entry *entry; |
1488 | unsigned long flags; | |
1489 | long disabled; | |
1490 | int resched; | |
1491 | int cpu; | |
1492 | int pc; | |
1493 | ||
1494 | pc = preempt_count(); | |
1495 | resched = ftrace_preempt_disable(); | |
1496 | cpu = raw_smp_processor_id(); | |
245b2e70 | 1497 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
1498 | |
1499 | if (disabled != 1) | |
1500 | goto out; | |
1501 | ||
1502 | local_save_flags(flags); | |
1503 | ||
e77405ad SR |
1504 | event = trace_current_buffer_lock_reserve(&buffer, |
1505 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
1506 | flags, pc); |
1507 | if (!event) | |
1508 | goto out; | |
1509 | entry = ring_buffer_event_data(event); | |
1510 | entry->ip = ip; | |
1511 | entry->parent_ip = parent_ip; | |
1512 | ||
e77405ad | 1513 | trace_nowake_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
1514 | |
1515 | out: | |
245b2e70 | 1516 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
1517 | ftrace_preempt_enable(resched); |
1518 | } | |
1519 | ||
1520 | static struct ftrace_ops trace_ops __initdata = | |
1521 | { | |
1522 | .func = function_test_events_call, | |
1523 | }; | |
1524 | ||
1525 | static __init void event_trace_self_test_with_function(void) | |
1526 | { | |
1527 | register_ftrace_function(&trace_ops); | |
1528 | pr_info("Running tests again, along with the function tracer\n"); | |
1529 | event_trace_self_tests(); | |
1530 | unregister_ftrace_function(&trace_ops); | |
1531 | } | |
1532 | #else | |
1533 | static __init void event_trace_self_test_with_function(void) | |
1534 | { | |
1535 | } | |
1536 | #endif | |
1537 | ||
1538 | static __init int event_trace_self_tests_init(void) | |
1539 | { | |
020e5f85 LZ |
1540 | if (!tracing_selftest_disabled) { |
1541 | event_trace_self_tests(); | |
1542 | event_trace_self_test_with_function(); | |
1543 | } | |
e6187007 SR |
1544 | |
1545 | return 0; | |
1546 | } | |
1547 | ||
28d20e2d | 1548 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
1549 | |
1550 | #endif |