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Commit | Line | Data |
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b77e38aa SR |
1 | /* |
2 | * event tracer | |
3 | * | |
4 | * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> | |
5 | * | |
981d081e SR |
6 | * - Added format output of fields of the trace point. |
7 | * This was based off of work by Tom Zanussi <tzanussi@gmail.com>. | |
8 | * | |
b77e38aa SR |
9 | */ |
10 | ||
e6187007 SR |
11 | #include <linux/workqueue.h> |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/kthread.h> | |
b77e38aa SR |
14 | #include <linux/debugfs.h> |
15 | #include <linux/uaccess.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/ctype.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
e6187007 | 19 | #include <linux/delay.h> |
b77e38aa | 20 | |
020e5f85 LZ |
21 | #include <asm/setup.h> |
22 | ||
91729ef9 | 23 | #include "trace_output.h" |
b77e38aa | 24 | |
4e5292ea | 25 | #undef TRACE_SYSTEM |
b628b3e6 SR |
26 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
27 | ||
20c8928a | 28 | DEFINE_MUTEX(event_mutex); |
11a241a3 | 29 | |
a59fd602 | 30 | LIST_HEAD(ftrace_events); |
8728fe50 | 31 | LIST_HEAD(ftrace_common_fields); |
a59fd602 | 32 | |
2e33af02 SR |
33 | struct list_head * |
34 | trace_get_fields(struct ftrace_event_call *event_call) | |
35 | { | |
36 | if (!event_call->class->get_fields) | |
37 | return &event_call->class->fields; | |
38 | return event_call->class->get_fields(event_call); | |
39 | } | |
40 | ||
8728fe50 LZ |
41 | static int __trace_define_field(struct list_head *head, const char *type, |
42 | const char *name, int offset, int size, | |
43 | int is_signed, int filter_type) | |
cf027f64 TZ |
44 | { |
45 | struct ftrace_event_field *field; | |
46 | ||
fe9f57f2 | 47 | field = kzalloc(sizeof(*field), GFP_KERNEL); |
cf027f64 TZ |
48 | if (!field) |
49 | goto err; | |
fe9f57f2 | 50 | |
cf027f64 TZ |
51 | field->name = kstrdup(name, GFP_KERNEL); |
52 | if (!field->name) | |
53 | goto err; | |
fe9f57f2 | 54 | |
cf027f64 TZ |
55 | field->type = kstrdup(type, GFP_KERNEL); |
56 | if (!field->type) | |
57 | goto err; | |
fe9f57f2 | 58 | |
43b51ead LZ |
59 | if (filter_type == FILTER_OTHER) |
60 | field->filter_type = filter_assign_type(type); | |
61 | else | |
62 | field->filter_type = filter_type; | |
63 | ||
cf027f64 TZ |
64 | field->offset = offset; |
65 | field->size = size; | |
a118e4d1 | 66 | field->is_signed = is_signed; |
aa38e9fc | 67 | |
2e33af02 | 68 | list_add(&field->link, head); |
cf027f64 TZ |
69 | |
70 | return 0; | |
fe9f57f2 | 71 | |
cf027f64 | 72 | err: |
7b60997f | 73 | if (field) |
cf027f64 | 74 | kfree(field->name); |
cf027f64 | 75 | kfree(field); |
fe9f57f2 | 76 | |
cf027f64 TZ |
77 | return -ENOMEM; |
78 | } | |
8728fe50 LZ |
79 | |
80 | int trace_define_field(struct ftrace_event_call *call, const char *type, | |
81 | const char *name, int offset, int size, int is_signed, | |
82 | int filter_type) | |
83 | { | |
84 | struct list_head *head; | |
85 | ||
86 | if (WARN_ON(!call->class)) | |
87 | return 0; | |
88 | ||
89 | head = trace_get_fields(call); | |
90 | return __trace_define_field(head, type, name, offset, size, | |
91 | is_signed, filter_type); | |
92 | } | |
17c873ec | 93 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 94 | |
e647d6b3 | 95 | #define __common_field(type, item) \ |
8728fe50 LZ |
96 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
97 | "common_" #item, \ | |
98 | offsetof(typeof(ent), item), \ | |
99 | sizeof(ent.item), \ | |
100 | is_signed_type(type), FILTER_OTHER); \ | |
e647d6b3 LZ |
101 | if (ret) \ |
102 | return ret; | |
103 | ||
8728fe50 | 104 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
105 | { |
106 | int ret; | |
107 | struct trace_entry ent; | |
108 | ||
109 | __common_field(unsigned short, type); | |
110 | __common_field(unsigned char, flags); | |
111 | __common_field(unsigned char, preempt_count); | |
112 | __common_field(int, pid); | |
637e7e86 | 113 | __common_field(int, lock_depth); |
e647d6b3 LZ |
114 | |
115 | return ret; | |
116 | } | |
117 | ||
bd1a5c84 | 118 | void trace_destroy_fields(struct ftrace_event_call *call) |
2df75e41 LZ |
119 | { |
120 | struct ftrace_event_field *field, *next; | |
2e33af02 | 121 | struct list_head *head; |
2df75e41 | 122 | |
2e33af02 SR |
123 | head = trace_get_fields(call); |
124 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 LZ |
125 | list_del(&field->link); |
126 | kfree(field->type); | |
127 | kfree(field->name); | |
128 | kfree(field); | |
129 | } | |
130 | } | |
131 | ||
87d9b4e1 LZ |
132 | int trace_event_raw_init(struct ftrace_event_call *call) |
133 | { | |
134 | int id; | |
135 | ||
80decc70 | 136 | id = register_ftrace_event(&call->event); |
87d9b4e1 LZ |
137 | if (!id) |
138 | return -ENODEV; | |
87d9b4e1 LZ |
139 | |
140 | return 0; | |
141 | } | |
142 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
143 | ||
3b8e4273 | 144 | static int ftrace_event_enable_disable(struct ftrace_event_call *call, |
fd994989 SR |
145 | int enable) |
146 | { | |
3b8e4273 LZ |
147 | int ret = 0; |
148 | ||
fd994989 SR |
149 | switch (enable) { |
150 | case 0: | |
553552ce SR |
151 | if (call->flags & TRACE_EVENT_FL_ENABLED) { |
152 | call->flags &= ~TRACE_EVENT_FL_ENABLED; | |
b11c53e1 | 153 | tracing_stop_cmdline_record(); |
2239291a SR |
154 | if (call->class->reg) |
155 | call->class->reg(call, TRACE_REG_UNREGISTER); | |
156 | else | |
157 | tracepoint_probe_unregister(call->name, | |
158 | call->class->probe, | |
159 | call); | |
fd994989 | 160 | } |
fd994989 SR |
161 | break; |
162 | case 1: | |
553552ce | 163 | if (!(call->flags & TRACE_EVENT_FL_ENABLED)) { |
b11c53e1 | 164 | tracing_start_cmdline_record(); |
2239291a SR |
165 | if (call->class->reg) |
166 | ret = call->class->reg(call, TRACE_REG_REGISTER); | |
167 | else | |
168 | ret = tracepoint_probe_register(call->name, | |
169 | call->class->probe, | |
170 | call); | |
3b8e4273 LZ |
171 | if (ret) { |
172 | tracing_stop_cmdline_record(); | |
173 | pr_info("event trace: Could not enable event " | |
174 | "%s\n", call->name); | |
175 | break; | |
176 | } | |
553552ce | 177 | call->flags |= TRACE_EVENT_FL_ENABLED; |
fd994989 | 178 | } |
fd994989 SR |
179 | break; |
180 | } | |
3b8e4273 LZ |
181 | |
182 | return ret; | |
fd994989 SR |
183 | } |
184 | ||
0e907c99 Z |
185 | static void ftrace_clear_events(void) |
186 | { | |
187 | struct ftrace_event_call *call; | |
188 | ||
189 | mutex_lock(&event_mutex); | |
190 | list_for_each_entry(call, &ftrace_events, list) { | |
191 | ftrace_event_enable_disable(call, 0); | |
192 | } | |
193 | mutex_unlock(&event_mutex); | |
194 | } | |
195 | ||
8f31bfe5 LZ |
196 | /* |
197 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
198 | */ | |
199 | static int __ftrace_set_clr_event(const char *match, const char *sub, | |
200 | const char *event, int set) | |
b77e38aa | 201 | { |
a59fd602 | 202 | struct ftrace_event_call *call; |
29f93943 | 203 | int ret = -EINVAL; |
8f31bfe5 LZ |
204 | |
205 | mutex_lock(&event_mutex); | |
206 | list_for_each_entry(call, &ftrace_events, list) { | |
207 | ||
2239291a SR |
208 | if (!call->name || !call->class || |
209 | (!call->class->probe && !call->class->reg)) | |
8f31bfe5 LZ |
210 | continue; |
211 | ||
212 | if (match && | |
213 | strcmp(match, call->name) != 0 && | |
8f082018 | 214 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
215 | continue; |
216 | ||
8f082018 | 217 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
218 | continue; |
219 | ||
220 | if (event && strcmp(event, call->name) != 0) | |
221 | continue; | |
222 | ||
223 | ftrace_event_enable_disable(call, set); | |
224 | ||
225 | ret = 0; | |
226 | } | |
227 | mutex_unlock(&event_mutex); | |
228 | ||
229 | return ret; | |
230 | } | |
231 | ||
232 | static int ftrace_set_clr_event(char *buf, int set) | |
233 | { | |
b628b3e6 | 234 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
235 | |
236 | /* | |
237 | * The buf format can be <subsystem>:<event-name> | |
238 | * *:<event-name> means any event by that name. | |
239 | * :<event-name> is the same. | |
240 | * | |
241 | * <subsystem>:* means all events in that subsystem | |
242 | * <subsystem>: means the same. | |
243 | * | |
244 | * <name> (no ':') means all events in a subsystem with | |
245 | * the name <name> or any event that matches <name> | |
246 | */ | |
247 | ||
248 | match = strsep(&buf, ":"); | |
249 | if (buf) { | |
250 | sub = match; | |
251 | event = buf; | |
252 | match = NULL; | |
253 | ||
254 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
255 | sub = NULL; | |
256 | if (!strlen(event) || strcmp(event, "*") == 0) | |
257 | event = NULL; | |
258 | } | |
b77e38aa | 259 | |
8f31bfe5 | 260 | return __ftrace_set_clr_event(match, sub, event, set); |
b77e38aa SR |
261 | } |
262 | ||
4671c794 SR |
263 | /** |
264 | * trace_set_clr_event - enable or disable an event | |
265 | * @system: system name to match (NULL for any system) | |
266 | * @event: event name to match (NULL for all events, within system) | |
267 | * @set: 1 to enable, 0 to disable | |
268 | * | |
269 | * This is a way for other parts of the kernel to enable or disable | |
270 | * event recording. | |
271 | * | |
272 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
273 | * registered events. | |
274 | */ | |
275 | int trace_set_clr_event(const char *system, const char *event, int set) | |
276 | { | |
277 | return __ftrace_set_clr_event(NULL, system, event, set); | |
278 | } | |
279 | ||
b77e38aa SR |
280 | /* 128 should be much more than enough */ |
281 | #define EVENT_BUF_SIZE 127 | |
282 | ||
283 | static ssize_t | |
284 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
285 | size_t cnt, loff_t *ppos) | |
286 | { | |
48966364 | 287 | struct trace_parser parser; |
4ba7978e | 288 | ssize_t read, ret; |
b77e38aa | 289 | |
4ba7978e | 290 | if (!cnt) |
b77e38aa SR |
291 | return 0; |
292 | ||
1852fcce SR |
293 | ret = tracing_update_buffers(); |
294 | if (ret < 0) | |
295 | return ret; | |
296 | ||
48966364 | 297 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
298 | return -ENOMEM; |
299 | ||
48966364 | 300 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
301 | ||
4ba7978e | 302 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 303 | int set = 1; |
b77e38aa | 304 | |
48966364 | 305 | if (*parser.buffer == '!') |
b77e38aa | 306 | set = 0; |
b77e38aa | 307 | |
48966364 | 308 | parser.buffer[parser.idx] = 0; |
309 | ||
310 | ret = ftrace_set_clr_event(parser.buffer + !set, set); | |
b77e38aa | 311 | if (ret) |
48966364 | 312 | goto out_put; |
b77e38aa | 313 | } |
b77e38aa SR |
314 | |
315 | ret = read; | |
316 | ||
48966364 | 317 | out_put: |
318 | trace_parser_put(&parser); | |
b77e38aa SR |
319 | |
320 | return ret; | |
321 | } | |
322 | ||
323 | static void * | |
324 | t_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 | 330 | list_for_each_entry_continue(call, &ftrace_events, list) { |
40e26815 SR |
331 | /* |
332 | * The ftrace subsystem is for showing formats only. | |
333 | * They can not be enabled or disabled via the event files. | |
334 | */ | |
2239291a | 335 | if (call->class && (call->class->probe || call->class->reg)) |
30bd39cd | 336 | return call; |
40e26815 | 337 | } |
b77e38aa | 338 | |
30bd39cd | 339 | return NULL; |
b77e38aa SR |
340 | } |
341 | ||
342 | static void *t_start(struct seq_file *m, loff_t *pos) | |
343 | { | |
30bd39cd | 344 | struct ftrace_event_call *call; |
e1c7e2a6 LZ |
345 | loff_t l; |
346 | ||
20c8928a | 347 | mutex_lock(&event_mutex); |
e1c7e2a6 | 348 | |
30bd39cd | 349 | call = list_entry(&ftrace_events, struct ftrace_event_call, list); |
e1c7e2a6 | 350 | for (l = 0; l <= *pos; ) { |
30bd39cd | 351 | call = t_next(m, call, &l); |
e1c7e2a6 LZ |
352 | if (!call) |
353 | break; | |
354 | } | |
355 | return call; | |
b77e38aa SR |
356 | } |
357 | ||
358 | static void * | |
359 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
360 | { | |
30bd39cd | 361 | struct ftrace_event_call *call = v; |
b77e38aa SR |
362 | |
363 | (*pos)++; | |
364 | ||
30bd39cd | 365 | list_for_each_entry_continue(call, &ftrace_events, list) { |
553552ce | 366 | if (call->flags & TRACE_EVENT_FL_ENABLED) |
30bd39cd | 367 | return call; |
b77e38aa SR |
368 | } |
369 | ||
30bd39cd | 370 | return NULL; |
b77e38aa SR |
371 | } |
372 | ||
373 | static void *s_start(struct seq_file *m, loff_t *pos) | |
374 | { | |
30bd39cd | 375 | struct ftrace_event_call *call; |
e1c7e2a6 LZ |
376 | loff_t l; |
377 | ||
20c8928a | 378 | mutex_lock(&event_mutex); |
e1c7e2a6 | 379 | |
30bd39cd | 380 | call = list_entry(&ftrace_events, struct ftrace_event_call, list); |
e1c7e2a6 | 381 | for (l = 0; l <= *pos; ) { |
30bd39cd | 382 | call = s_next(m, call, &l); |
e1c7e2a6 LZ |
383 | if (!call) |
384 | break; | |
385 | } | |
386 | return call; | |
b77e38aa SR |
387 | } |
388 | ||
389 | static int t_show(struct seq_file *m, void *v) | |
390 | { | |
391 | struct ftrace_event_call *call = v; | |
392 | ||
8f082018 SR |
393 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
394 | seq_printf(m, "%s:", call->class->system); | |
b77e38aa SR |
395 | seq_printf(m, "%s\n", call->name); |
396 | ||
397 | return 0; | |
398 | } | |
399 | ||
400 | static void t_stop(struct seq_file *m, void *p) | |
401 | { | |
20c8928a | 402 | mutex_unlock(&event_mutex); |
b77e38aa SR |
403 | } |
404 | ||
405 | static int | |
406 | ftrace_event_seq_open(struct inode *inode, struct file *file) | |
407 | { | |
b77e38aa SR |
408 | const struct seq_operations *seq_ops; |
409 | ||
410 | if ((file->f_mode & FMODE_WRITE) && | |
8650ae32 | 411 | (file->f_flags & O_TRUNC)) |
b77e38aa SR |
412 | ftrace_clear_events(); |
413 | ||
414 | seq_ops = inode->i_private; | |
20c8928a | 415 | return seq_open(file, seq_ops); |
b77e38aa SR |
416 | } |
417 | ||
1473e441 SR |
418 | static ssize_t |
419 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
420 | loff_t *ppos) | |
421 | { | |
422 | struct ftrace_event_call *call = filp->private_data; | |
423 | char *buf; | |
424 | ||
553552ce | 425 | if (call->flags & TRACE_EVENT_FL_ENABLED) |
1473e441 SR |
426 | buf = "1\n"; |
427 | else | |
428 | buf = "0\n"; | |
429 | ||
430 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
431 | } | |
432 | ||
433 | static ssize_t | |
434 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
435 | loff_t *ppos) | |
436 | { | |
437 | struct ftrace_event_call *call = filp->private_data; | |
438 | char buf[64]; | |
439 | unsigned long val; | |
440 | int ret; | |
441 | ||
442 | if (cnt >= sizeof(buf)) | |
443 | return -EINVAL; | |
444 | ||
445 | if (copy_from_user(&buf, ubuf, cnt)) | |
446 | return -EFAULT; | |
447 | ||
448 | buf[cnt] = 0; | |
449 | ||
450 | ret = strict_strtoul(buf, 10, &val); | |
451 | if (ret < 0) | |
452 | return ret; | |
453 | ||
1852fcce SR |
454 | ret = tracing_update_buffers(); |
455 | if (ret < 0) | |
456 | return ret; | |
457 | ||
1473e441 SR |
458 | switch (val) { |
459 | case 0: | |
1473e441 | 460 | case 1: |
11a241a3 | 461 | mutex_lock(&event_mutex); |
3b8e4273 | 462 | ret = ftrace_event_enable_disable(call, val); |
11a241a3 | 463 | mutex_unlock(&event_mutex); |
1473e441 SR |
464 | break; |
465 | ||
466 | default: | |
467 | return -EINVAL; | |
468 | } | |
469 | ||
470 | *ppos += cnt; | |
471 | ||
3b8e4273 | 472 | return ret ? ret : cnt; |
1473e441 SR |
473 | } |
474 | ||
8ae79a13 SR |
475 | static ssize_t |
476 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
477 | loff_t *ppos) | |
478 | { | |
c142b15d | 479 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
8ae79a13 SR |
480 | const char *system = filp->private_data; |
481 | struct ftrace_event_call *call; | |
482 | char buf[2]; | |
c142b15d | 483 | int set = 0; |
8ae79a13 SR |
484 | int ret; |
485 | ||
8ae79a13 SR |
486 | mutex_lock(&event_mutex); |
487 | list_for_each_entry(call, &ftrace_events, list) { | |
2239291a SR |
488 | if (!call->name || !call->class || |
489 | (!call->class->probe && !call->class->reg)) | |
8ae79a13 SR |
490 | continue; |
491 | ||
8f082018 | 492 | if (system && strcmp(call->class->system, system) != 0) |
8ae79a13 SR |
493 | continue; |
494 | ||
495 | /* | |
496 | * We need to find out if all the events are set | |
497 | * or if all events or cleared, or if we have | |
498 | * a mixture. | |
499 | */ | |
553552ce | 500 | set |= (1 << !!(call->flags & TRACE_EVENT_FL_ENABLED)); |
c142b15d | 501 | |
8ae79a13 SR |
502 | /* |
503 | * If we have a mixture, no need to look further. | |
504 | */ | |
c142b15d | 505 | if (set == 3) |
8ae79a13 SR |
506 | break; |
507 | } | |
508 | mutex_unlock(&event_mutex); | |
509 | ||
c142b15d | 510 | buf[0] = set_to_char[set]; |
8ae79a13 | 511 | buf[1] = '\n'; |
8ae79a13 SR |
512 | |
513 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
514 | ||
515 | return ret; | |
516 | } | |
517 | ||
518 | static ssize_t | |
519 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
520 | loff_t *ppos) | |
521 | { | |
522 | const char *system = filp->private_data; | |
523 | unsigned long val; | |
8ae79a13 SR |
524 | char buf[64]; |
525 | ssize_t ret; | |
526 | ||
527 | if (cnt >= sizeof(buf)) | |
528 | return -EINVAL; | |
529 | ||
530 | if (copy_from_user(&buf, ubuf, cnt)) | |
531 | return -EFAULT; | |
532 | ||
533 | buf[cnt] = 0; | |
534 | ||
535 | ret = strict_strtoul(buf, 10, &val); | |
536 | if (ret < 0) | |
537 | return ret; | |
538 | ||
539 | ret = tracing_update_buffers(); | |
540 | if (ret < 0) | |
541 | return ret; | |
542 | ||
8f31bfe5 | 543 | if (val != 0 && val != 1) |
8ae79a13 | 544 | return -EINVAL; |
8ae79a13 | 545 | |
8f31bfe5 | 546 | ret = __ftrace_set_clr_event(NULL, system, NULL, val); |
8ae79a13 | 547 | if (ret) |
8f31bfe5 | 548 | goto out; |
8ae79a13 SR |
549 | |
550 | ret = cnt; | |
551 | ||
8f31bfe5 | 552 | out: |
8ae79a13 SR |
553 | *ppos += cnt; |
554 | ||
555 | return ret; | |
556 | } | |
557 | ||
8728fe50 | 558 | static void print_event_fields(struct trace_seq *s, struct list_head *head) |
981d081e | 559 | { |
5a65e956 | 560 | struct ftrace_event_field *field; |
981d081e | 561 | |
2e33af02 | 562 | list_for_each_entry_reverse(field, head, link) { |
5a65e956 LJ |
563 | /* |
564 | * Smartly shows the array type(except dynamic array). | |
565 | * Normal: | |
566 | * field:TYPE VAR | |
567 | * If TYPE := TYPE[LEN], it is shown: | |
568 | * field:TYPE VAR[LEN] | |
569 | */ | |
570 | const char *array_descriptor = strchr(field->type, '['); | |
571 | ||
572 | if (!strncmp(field->type, "__data_loc", 10)) | |
573 | array_descriptor = NULL; | |
574 | ||
575 | if (!array_descriptor) { | |
8728fe50 | 576 | trace_seq_printf(s, "\tfield:%s %s;\toffset:%u;" |
5a65e956 LJ |
577 | "\tsize:%u;\tsigned:%d;\n", |
578 | field->type, field->name, field->offset, | |
579 | field->size, !!field->is_signed); | |
580 | } else { | |
8728fe50 | 581 | trace_seq_printf(s, "\tfield:%.*s %s%s;\toffset:%u;" |
5a65e956 LJ |
582 | "\tsize:%u;\tsigned:%d;\n", |
583 | (int)(array_descriptor - field->type), | |
584 | field->type, field->name, | |
585 | array_descriptor, field->offset, | |
586 | field->size, !!field->is_signed); | |
587 | } | |
8728fe50 LZ |
588 | } |
589 | } | |
5a65e956 | 590 | |
8728fe50 LZ |
591 | static ssize_t |
592 | event_format_read(struct file *filp, char __user *ubuf, size_t cnt, | |
593 | loff_t *ppos) | |
594 | { | |
595 | struct ftrace_event_call *call = filp->private_data; | |
596 | struct list_head *head; | |
597 | struct trace_seq *s; | |
598 | char *buf; | |
599 | int r; | |
5a65e956 | 600 | |
8728fe50 LZ |
601 | if (*ppos) |
602 | return 0; | |
5a65e956 | 603 | |
8728fe50 LZ |
604 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
605 | if (!s) | |
606 | return -ENOMEM; | |
607 | ||
608 | trace_seq_init(s); | |
609 | ||
610 | trace_seq_printf(s, "name: %s\n", call->name); | |
611 | trace_seq_printf(s, "ID: %d\n", call->event.type); | |
612 | trace_seq_printf(s, "format:\n"); | |
613 | ||
614 | /* print common fields */ | |
615 | print_event_fields(s, &ftrace_common_fields); | |
616 | ||
617 | trace_seq_putc(s, '\n'); | |
618 | ||
619 | /* print event specific fields */ | |
620 | head = trace_get_fields(call); | |
621 | print_event_fields(s, head); | |
622 | ||
623 | r = trace_seq_printf(s, "\nprint fmt: %s\n", call->print_fmt); | |
5a65e956 | 624 | |
981d081e SR |
625 | if (!r) { |
626 | /* | |
627 | * ug! The format output is bigger than a PAGE!! | |
628 | */ | |
629 | buf = "FORMAT TOO BIG\n"; | |
630 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
631 | buf, strlen(buf)); | |
632 | goto out; | |
633 | } | |
634 | ||
635 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
636 | s->buffer, s->len); | |
637 | out: | |
638 | kfree(s); | |
639 | return r; | |
640 | } | |
641 | ||
23725aee PZ |
642 | static ssize_t |
643 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
644 | { | |
645 | struct ftrace_event_call *call = filp->private_data; | |
646 | struct trace_seq *s; | |
647 | int r; | |
648 | ||
649 | if (*ppos) | |
650 | return 0; | |
651 | ||
652 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
653 | if (!s) | |
654 | return -ENOMEM; | |
655 | ||
656 | trace_seq_init(s); | |
32c0edae | 657 | trace_seq_printf(s, "%d\n", call->event.type); |
23725aee PZ |
658 | |
659 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
660 | s->buffer, s->len); | |
661 | kfree(s); | |
662 | return r; | |
663 | } | |
664 | ||
7ce7e424 TZ |
665 | static ssize_t |
666 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
667 | loff_t *ppos) | |
668 | { | |
669 | struct ftrace_event_call *call = filp->private_data; | |
670 | struct trace_seq *s; | |
671 | int r; | |
672 | ||
673 | if (*ppos) | |
674 | return 0; | |
675 | ||
676 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
677 | if (!s) | |
678 | return -ENOMEM; | |
679 | ||
680 | trace_seq_init(s); | |
681 | ||
8b372562 | 682 | print_event_filter(call, s); |
4bda2d51 | 683 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
684 | |
685 | kfree(s); | |
686 | ||
687 | return r; | |
688 | } | |
689 | ||
690 | static ssize_t | |
691 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
692 | loff_t *ppos) | |
693 | { | |
694 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 695 | char *buf; |
7ce7e424 TZ |
696 | int err; |
697 | ||
8b372562 | 698 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
699 | return -EINVAL; |
700 | ||
8b372562 TZ |
701 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
702 | if (!buf) | |
7ce7e424 TZ |
703 | return -ENOMEM; |
704 | ||
8b372562 TZ |
705 | if (copy_from_user(buf, ubuf, cnt)) { |
706 | free_page((unsigned long) buf); | |
707 | return -EFAULT; | |
7ce7e424 | 708 | } |
8b372562 | 709 | buf[cnt] = '\0'; |
7ce7e424 | 710 | |
8b372562 TZ |
711 | err = apply_event_filter(call, buf); |
712 | free_page((unsigned long) buf); | |
713 | if (err < 0) | |
44e9c8b7 | 714 | return err; |
0a19e53c | 715 | |
7ce7e424 TZ |
716 | *ppos += cnt; |
717 | ||
718 | return cnt; | |
719 | } | |
720 | ||
cfb180f3 TZ |
721 | static ssize_t |
722 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
723 | loff_t *ppos) | |
724 | { | |
725 | struct event_subsystem *system = filp->private_data; | |
726 | struct trace_seq *s; | |
727 | int r; | |
728 | ||
729 | if (*ppos) | |
730 | return 0; | |
731 | ||
732 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
733 | if (!s) | |
734 | return -ENOMEM; | |
735 | ||
736 | trace_seq_init(s); | |
737 | ||
8b372562 | 738 | print_subsystem_event_filter(system, s); |
4bda2d51 | 739 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
740 | |
741 | kfree(s); | |
742 | ||
743 | return r; | |
744 | } | |
745 | ||
746 | static ssize_t | |
747 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
748 | loff_t *ppos) | |
749 | { | |
750 | struct event_subsystem *system = filp->private_data; | |
8b372562 | 751 | char *buf; |
cfb180f3 TZ |
752 | int err; |
753 | ||
8b372562 | 754 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
755 | return -EINVAL; |
756 | ||
8b372562 TZ |
757 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
758 | if (!buf) | |
cfb180f3 TZ |
759 | return -ENOMEM; |
760 | ||
8b372562 TZ |
761 | if (copy_from_user(buf, ubuf, cnt)) { |
762 | free_page((unsigned long) buf); | |
763 | return -EFAULT; | |
cfb180f3 | 764 | } |
8b372562 | 765 | buf[cnt] = '\0'; |
cfb180f3 | 766 | |
8b372562 TZ |
767 | err = apply_subsystem_event_filter(system, buf); |
768 | free_page((unsigned long) buf); | |
769 | if (err < 0) | |
44e9c8b7 | 770 | return err; |
cfb180f3 TZ |
771 | |
772 | *ppos += cnt; | |
773 | ||
774 | return cnt; | |
775 | } | |
776 | ||
d1b182a8 SR |
777 | static ssize_t |
778 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
779 | { | |
780 | int (*func)(struct trace_seq *s) = filp->private_data; | |
781 | struct trace_seq *s; | |
782 | int r; | |
783 | ||
784 | if (*ppos) | |
785 | return 0; | |
786 | ||
787 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
788 | if (!s) | |
789 | return -ENOMEM; | |
790 | ||
791 | trace_seq_init(s); | |
792 | ||
793 | func(s); | |
794 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
795 | ||
796 | kfree(s); | |
797 | ||
798 | return r; | |
799 | } | |
800 | ||
b77e38aa SR |
801 | static const struct seq_operations show_event_seq_ops = { |
802 | .start = t_start, | |
803 | .next = t_next, | |
804 | .show = t_show, | |
805 | .stop = t_stop, | |
806 | }; | |
807 | ||
808 | static const struct seq_operations show_set_event_seq_ops = { | |
809 | .start = s_start, | |
810 | .next = s_next, | |
811 | .show = t_show, | |
812 | .stop = t_stop, | |
813 | }; | |
814 | ||
2314c4ae SR |
815 | static const struct file_operations ftrace_avail_fops = { |
816 | .open = ftrace_event_seq_open, | |
817 | .read = seq_read, | |
818 | .llseek = seq_lseek, | |
819 | .release = seq_release, | |
820 | }; | |
821 | ||
b77e38aa SR |
822 | static const struct file_operations ftrace_set_event_fops = { |
823 | .open = ftrace_event_seq_open, | |
824 | .read = seq_read, | |
825 | .write = ftrace_event_write, | |
826 | .llseek = seq_lseek, | |
827 | .release = seq_release, | |
828 | }; | |
829 | ||
1473e441 SR |
830 | static const struct file_operations ftrace_enable_fops = { |
831 | .open = tracing_open_generic, | |
832 | .read = event_enable_read, | |
833 | .write = event_enable_write, | |
834 | }; | |
835 | ||
981d081e SR |
836 | static const struct file_operations ftrace_event_format_fops = { |
837 | .open = tracing_open_generic, | |
838 | .read = event_format_read, | |
839 | }; | |
840 | ||
23725aee PZ |
841 | static const struct file_operations ftrace_event_id_fops = { |
842 | .open = tracing_open_generic, | |
843 | .read = event_id_read, | |
844 | }; | |
845 | ||
7ce7e424 TZ |
846 | static const struct file_operations ftrace_event_filter_fops = { |
847 | .open = tracing_open_generic, | |
848 | .read = event_filter_read, | |
849 | .write = event_filter_write, | |
850 | }; | |
851 | ||
cfb180f3 TZ |
852 | static const struct file_operations ftrace_subsystem_filter_fops = { |
853 | .open = tracing_open_generic, | |
854 | .read = subsystem_filter_read, | |
855 | .write = subsystem_filter_write, | |
856 | }; | |
857 | ||
8ae79a13 SR |
858 | static const struct file_operations ftrace_system_enable_fops = { |
859 | .open = tracing_open_generic, | |
860 | .read = system_enable_read, | |
861 | .write = system_enable_write, | |
862 | }; | |
863 | ||
d1b182a8 SR |
864 | static const struct file_operations ftrace_show_header_fops = { |
865 | .open = tracing_open_generic, | |
866 | .read = show_header, | |
867 | }; | |
868 | ||
1473e441 SR |
869 | static struct dentry *event_trace_events_dir(void) |
870 | { | |
871 | static struct dentry *d_tracer; | |
872 | static struct dentry *d_events; | |
873 | ||
874 | if (d_events) | |
875 | return d_events; | |
876 | ||
877 | d_tracer = tracing_init_dentry(); | |
878 | if (!d_tracer) | |
879 | return NULL; | |
880 | ||
881 | d_events = debugfs_create_dir("events", d_tracer); | |
882 | if (!d_events) | |
883 | pr_warning("Could not create debugfs " | |
884 | "'events' directory\n"); | |
885 | ||
886 | return d_events; | |
887 | } | |
888 | ||
6ecc2d1c SR |
889 | static LIST_HEAD(event_subsystems); |
890 | ||
891 | static struct dentry * | |
892 | event_subsystem_dir(const char *name, struct dentry *d_events) | |
893 | { | |
894 | struct event_subsystem *system; | |
e1112b4d | 895 | struct dentry *entry; |
6ecc2d1c SR |
896 | |
897 | /* First see if we did not already create this dir */ | |
898 | list_for_each_entry(system, &event_subsystems, list) { | |
dc82ec98 XG |
899 | if (strcmp(system->name, name) == 0) { |
900 | system->nr_events++; | |
6ecc2d1c | 901 | return system->entry; |
dc82ec98 | 902 | } |
6ecc2d1c SR |
903 | } |
904 | ||
905 | /* need to create new entry */ | |
906 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
907 | if (!system) { | |
908 | pr_warning("No memory to create event subsystem %s\n", | |
909 | name); | |
910 | return d_events; | |
911 | } | |
912 | ||
913 | system->entry = debugfs_create_dir(name, d_events); | |
914 | if (!system->entry) { | |
915 | pr_warning("Could not create event subsystem %s\n", | |
916 | name); | |
917 | kfree(system); | |
918 | return d_events; | |
919 | } | |
920 | ||
dc82ec98 | 921 | system->nr_events = 1; |
6d723736 SR |
922 | system->name = kstrdup(name, GFP_KERNEL); |
923 | if (!system->name) { | |
924 | debugfs_remove(system->entry); | |
925 | kfree(system); | |
926 | return d_events; | |
927 | } | |
928 | ||
6ecc2d1c SR |
929 | list_add(&system->list, &event_subsystems); |
930 | ||
30e673b2 | 931 | system->filter = NULL; |
cfb180f3 | 932 | |
8b372562 TZ |
933 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
934 | if (!system->filter) { | |
935 | pr_warning("Could not allocate filter for subsystem " | |
936 | "'%s'\n", name); | |
937 | return system->entry; | |
938 | } | |
939 | ||
e1112b4d TZ |
940 | entry = debugfs_create_file("filter", 0644, system->entry, system, |
941 | &ftrace_subsystem_filter_fops); | |
8b372562 TZ |
942 | if (!entry) { |
943 | kfree(system->filter); | |
944 | system->filter = NULL; | |
e1112b4d TZ |
945 | pr_warning("Could not create debugfs " |
946 | "'%s/filter' entry\n", name); | |
8b372562 | 947 | } |
e1112b4d | 948 | |
f3f3f009 FW |
949 | trace_create_file("enable", 0644, system->entry, |
950 | (void *)system->name, | |
951 | &ftrace_system_enable_fops); | |
8ae79a13 | 952 | |
6ecc2d1c SR |
953 | return system->entry; |
954 | } | |
955 | ||
1473e441 | 956 | static int |
701970b3 SR |
957 | event_create_dir(struct ftrace_event_call *call, struct dentry *d_events, |
958 | const struct file_operations *id, | |
959 | const struct file_operations *enable, | |
960 | const struct file_operations *filter, | |
961 | const struct file_operations *format) | |
1473e441 | 962 | { |
2e33af02 | 963 | struct list_head *head; |
fd994989 | 964 | int ret; |
1473e441 | 965 | |
6ecc2d1c SR |
966 | /* |
967 | * If the trace point header did not define TRACE_SYSTEM | |
968 | * then the system would be called "TRACE_SYSTEM". | |
969 | */ | |
8f082018 SR |
970 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
971 | d_events = event_subsystem_dir(call->class->system, d_events); | |
6ecc2d1c | 972 | |
1473e441 SR |
973 | call->dir = debugfs_create_dir(call->name, d_events); |
974 | if (!call->dir) { | |
975 | pr_warning("Could not create debugfs " | |
976 | "'%s' directory\n", call->name); | |
977 | return -1; | |
978 | } | |
979 | ||
2239291a | 980 | if (call->class->probe || call->class->reg) |
f3f3f009 FW |
981 | trace_create_file("enable", 0644, call->dir, call, |
982 | enable); | |
1473e441 | 983 | |
2239291a | 984 | #ifdef CONFIG_PERF_EVENTS |
32c0edae | 985 | if (call->event.type && (call->class->perf_probe || call->class->reg)) |
f3f3f009 FW |
986 | trace_create_file("id", 0444, call->dir, call, |
987 | id); | |
2239291a | 988 | #endif |
23725aee | 989 | |
2e33af02 SR |
990 | if (call->class->define_fields) { |
991 | /* | |
992 | * Other events may have the same class. Only update | |
993 | * the fields if they are not already defined. | |
994 | */ | |
995 | head = trace_get_fields(call); | |
996 | if (list_empty(head)) { | |
8728fe50 | 997 | ret = call->class->define_fields(call); |
2e33af02 SR |
998 | if (ret < 0) { |
999 | pr_warning("Could not initialize trace point" | |
1000 | " events/%s\n", call->name); | |
1001 | return ret; | |
1002 | } | |
cf027f64 | 1003 | } |
f3f3f009 FW |
1004 | trace_create_file("filter", 0644, call->dir, call, |
1005 | filter); | |
cf027f64 TZ |
1006 | } |
1007 | ||
f3f3f009 FW |
1008 | trace_create_file("format", 0444, call->dir, call, |
1009 | format); | |
6d723736 SR |
1010 | |
1011 | return 0; | |
1012 | } | |
1013 | ||
bd1a5c84 MH |
1014 | static int __trace_add_event_call(struct ftrace_event_call *call) |
1015 | { | |
1016 | struct dentry *d_events; | |
1017 | int ret; | |
6d723736 | 1018 | |
bd1a5c84 MH |
1019 | if (!call->name) |
1020 | return -EINVAL; | |
701970b3 | 1021 | |
0405ab80 SR |
1022 | if (call->class->raw_init) { |
1023 | ret = call->class->raw_init(call); | |
bd1a5c84 MH |
1024 | if (ret < 0) { |
1025 | if (ret != -ENOSYS) | |
1026 | pr_warning("Could not initialize trace " | |
1027 | "events/%s\n", call->name); | |
1028 | return ret; | |
1029 | } | |
1030 | } | |
701970b3 | 1031 | |
bd1a5c84 MH |
1032 | d_events = event_trace_events_dir(); |
1033 | if (!d_events) | |
1034 | return -ENOENT; | |
1035 | ||
588bebb7 | 1036 | ret = event_create_dir(call, d_events, &ftrace_event_id_fops, |
bd1a5c84 MH |
1037 | &ftrace_enable_fops, &ftrace_event_filter_fops, |
1038 | &ftrace_event_format_fops); | |
88f70d75 MH |
1039 | if (!ret) |
1040 | list_add(&call->list, &ftrace_events); | |
1041 | ||
588bebb7 | 1042 | return ret; |
bd1a5c84 MH |
1043 | } |
1044 | ||
1045 | /* Add an additional event_call dynamically */ | |
1046 | int trace_add_event_call(struct ftrace_event_call *call) | |
1047 | { | |
1048 | int ret; | |
1049 | mutex_lock(&event_mutex); | |
1050 | ret = __trace_add_event_call(call); | |
1051 | mutex_unlock(&event_mutex); | |
1052 | return ret; | |
1053 | } | |
701970b3 | 1054 | |
a2ca5e03 FW |
1055 | static void remove_subsystem_dir(const char *name) |
1056 | { | |
1057 | struct event_subsystem *system; | |
1058 | ||
1059 | if (strcmp(name, TRACE_SYSTEM) == 0) | |
1060 | return; | |
1061 | ||
1062 | list_for_each_entry(system, &event_subsystems, list) { | |
1063 | if (strcmp(system->name, name) == 0) { | |
1064 | if (!--system->nr_events) { | |
1065 | struct event_filter *filter = system->filter; | |
1066 | ||
1067 | debugfs_remove_recursive(system->entry); | |
1068 | list_del(&system->list); | |
1069 | if (filter) { | |
1070 | kfree(filter->filter_string); | |
1071 | kfree(filter); | |
1072 | } | |
1073 | kfree(system->name); | |
1074 | kfree(system); | |
1075 | } | |
1076 | break; | |
1077 | } | |
1078 | } | |
1079 | } | |
1080 | ||
4fead8e4 MH |
1081 | /* |
1082 | * Must be called under locking both of event_mutex and trace_event_mutex. | |
1083 | */ | |
bd1a5c84 MH |
1084 | static void __trace_remove_event_call(struct ftrace_event_call *call) |
1085 | { | |
1086 | ftrace_event_enable_disable(call, 0); | |
80decc70 SR |
1087 | if (call->event.funcs) |
1088 | __unregister_ftrace_event(&call->event); | |
bd1a5c84 MH |
1089 | debugfs_remove_recursive(call->dir); |
1090 | list_del(&call->list); | |
1091 | trace_destroy_fields(call); | |
1092 | destroy_preds(call); | |
8f082018 | 1093 | remove_subsystem_dir(call->class->system); |
bd1a5c84 MH |
1094 | } |
1095 | ||
1096 | /* Remove an event_call */ | |
1097 | void trace_remove_event_call(struct ftrace_event_call *call) | |
1098 | { | |
1099 | mutex_lock(&event_mutex); | |
4fead8e4 | 1100 | down_write(&trace_event_mutex); |
bd1a5c84 | 1101 | __trace_remove_event_call(call); |
4fead8e4 | 1102 | up_write(&trace_event_mutex); |
bd1a5c84 MH |
1103 | mutex_unlock(&event_mutex); |
1104 | } | |
1105 | ||
1106 | #define for_each_event(event, start, end) \ | |
1107 | for (event = start; \ | |
1108 | (unsigned long)event < (unsigned long)end; \ | |
1109 | event++) | |
1110 | ||
1111 | #ifdef CONFIG_MODULES | |
1112 | ||
1113 | static LIST_HEAD(ftrace_module_file_list); | |
1114 | ||
1115 | /* | |
1116 | * Modules must own their file_operations to keep up with | |
1117 | * reference counting. | |
1118 | */ | |
1119 | struct ftrace_module_file_ops { | |
1120 | struct list_head list; | |
1121 | struct module *mod; | |
1122 | struct file_operations id; | |
1123 | struct file_operations enable; | |
1124 | struct file_operations format; | |
1125 | struct file_operations filter; | |
1126 | }; | |
1127 | ||
701970b3 SR |
1128 | static struct ftrace_module_file_ops * |
1129 | trace_create_file_ops(struct module *mod) | |
1130 | { | |
1131 | struct ftrace_module_file_ops *file_ops; | |
1132 | ||
1133 | /* | |
1134 | * This is a bit of a PITA. To allow for correct reference | |
1135 | * counting, modules must "own" their file_operations. | |
1136 | * To do this, we allocate the file operations that will be | |
1137 | * used in the event directory. | |
1138 | */ | |
1139 | ||
1140 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1141 | if (!file_ops) | |
1142 | return NULL; | |
1143 | ||
1144 | file_ops->mod = mod; | |
1145 | ||
1146 | file_ops->id = ftrace_event_id_fops; | |
1147 | file_ops->id.owner = mod; | |
1148 | ||
1149 | file_ops->enable = ftrace_enable_fops; | |
1150 | file_ops->enable.owner = mod; | |
1151 | ||
1152 | file_ops->filter = ftrace_event_filter_fops; | |
1153 | file_ops->filter.owner = mod; | |
1154 | ||
1155 | file_ops->format = ftrace_event_format_fops; | |
1156 | file_ops->format.owner = mod; | |
1157 | ||
1158 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1159 | ||
1160 | return file_ops; | |
1161 | } | |
1162 | ||
6d723736 SR |
1163 | static void trace_module_add_events(struct module *mod) |
1164 | { | |
701970b3 | 1165 | struct ftrace_module_file_ops *file_ops = NULL; |
6d723736 SR |
1166 | struct ftrace_event_call *call, *start, *end; |
1167 | struct dentry *d_events; | |
f744bd57 | 1168 | int ret; |
6d723736 SR |
1169 | |
1170 | start = mod->trace_events; | |
1171 | end = mod->trace_events + mod->num_trace_events; | |
1172 | ||
1173 | if (start == end) | |
1174 | return; | |
1175 | ||
1176 | d_events = event_trace_events_dir(); | |
1177 | if (!d_events) | |
1178 | return; | |
1179 | ||
1180 | for_each_event(call, start, end) { | |
1181 | /* The linker may leave blanks */ | |
1182 | if (!call->name) | |
1183 | continue; | |
0405ab80 SR |
1184 | if (call->class->raw_init) { |
1185 | ret = call->class->raw_init(call); | |
f744bd57 JB |
1186 | if (ret < 0) { |
1187 | if (ret != -ENOSYS) | |
1188 | pr_warning("Could not initialize trace " | |
1189 | "point events/%s\n", call->name); | |
1190 | continue; | |
1191 | } | |
1192 | } | |
701970b3 SR |
1193 | /* |
1194 | * This module has events, create file ops for this module | |
1195 | * if not already done. | |
1196 | */ | |
1197 | if (!file_ops) { | |
1198 | file_ops = trace_create_file_ops(mod); | |
1199 | if (!file_ops) | |
1200 | return; | |
1201 | } | |
6d723736 | 1202 | call->mod = mod; |
88f70d75 MH |
1203 | ret = event_create_dir(call, d_events, |
1204 | &file_ops->id, &file_ops->enable, | |
1205 | &file_ops->filter, &file_ops->format); | |
1206 | if (!ret) | |
1207 | list_add(&call->list, &ftrace_events); | |
6d723736 SR |
1208 | } |
1209 | } | |
1210 | ||
1211 | static void trace_module_remove_events(struct module *mod) | |
1212 | { | |
701970b3 | 1213 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1214 | struct ftrace_event_call *call, *p; |
9456f0fa | 1215 | bool found = false; |
6d723736 | 1216 | |
110bf2b7 | 1217 | down_write(&trace_event_mutex); |
6d723736 SR |
1218 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1219 | if (call->mod == mod) { | |
9456f0fa | 1220 | found = true; |
bd1a5c84 | 1221 | __trace_remove_event_call(call); |
6d723736 SR |
1222 | } |
1223 | } | |
701970b3 SR |
1224 | |
1225 | /* Now free the file_operations */ | |
1226 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1227 | if (file_ops->mod == mod) | |
1228 | break; | |
1229 | } | |
1230 | if (&file_ops->list != &ftrace_module_file_list) { | |
1231 | list_del(&file_ops->list); | |
1232 | kfree(file_ops); | |
1233 | } | |
9456f0fa SR |
1234 | |
1235 | /* | |
1236 | * It is safest to reset the ring buffer if the module being unloaded | |
1237 | * registered any events. | |
1238 | */ | |
1239 | if (found) | |
1240 | tracing_reset_current_online_cpus(); | |
110bf2b7 | 1241 | up_write(&trace_event_mutex); |
6d723736 SR |
1242 | } |
1243 | ||
61f919a1 SR |
1244 | static int trace_module_notify(struct notifier_block *self, |
1245 | unsigned long val, void *data) | |
6d723736 SR |
1246 | { |
1247 | struct module *mod = data; | |
1248 | ||
1249 | mutex_lock(&event_mutex); | |
1250 | switch (val) { | |
1251 | case MODULE_STATE_COMING: | |
1252 | trace_module_add_events(mod); | |
1253 | break; | |
1254 | case MODULE_STATE_GOING: | |
1255 | trace_module_remove_events(mod); | |
1256 | break; | |
1257 | } | |
1258 | mutex_unlock(&event_mutex); | |
fd994989 | 1259 | |
1473e441 SR |
1260 | return 0; |
1261 | } | |
61f919a1 SR |
1262 | #else |
1263 | static int trace_module_notify(struct notifier_block *self, | |
1264 | unsigned long val, void *data) | |
1265 | { | |
1266 | return 0; | |
1267 | } | |
1268 | #endif /* CONFIG_MODULES */ | |
1473e441 | 1269 | |
ec827c7e | 1270 | static struct notifier_block trace_module_nb = { |
6d723736 SR |
1271 | .notifier_call = trace_module_notify, |
1272 | .priority = 0, | |
1273 | }; | |
1274 | ||
a59fd602 SR |
1275 | extern struct ftrace_event_call __start_ftrace_events[]; |
1276 | extern struct ftrace_event_call __stop_ftrace_events[]; | |
1277 | ||
020e5f85 LZ |
1278 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
1279 | ||
1280 | static __init int setup_trace_event(char *str) | |
1281 | { | |
1282 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
1283 | ring_buffer_expanded = 1; | |
1284 | tracing_selftest_disabled = 1; | |
1285 | ||
1286 | return 1; | |
1287 | } | |
1288 | __setup("trace_event=", setup_trace_event); | |
1289 | ||
b77e38aa SR |
1290 | static __init int event_trace_init(void) |
1291 | { | |
a59fd602 | 1292 | struct ftrace_event_call *call; |
b77e38aa SR |
1293 | struct dentry *d_tracer; |
1294 | struct dentry *entry; | |
1473e441 | 1295 | struct dentry *d_events; |
6d723736 | 1296 | int ret; |
020e5f85 LZ |
1297 | char *buf = bootup_event_buf; |
1298 | char *token; | |
b77e38aa SR |
1299 | |
1300 | d_tracer = tracing_init_dentry(); | |
1301 | if (!d_tracer) | |
1302 | return 0; | |
1303 | ||
2314c4ae SR |
1304 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
1305 | (void *)&show_event_seq_ops, | |
1306 | &ftrace_avail_fops); | |
1307 | if (!entry) | |
1308 | pr_warning("Could not create debugfs " | |
1309 | "'available_events' entry\n"); | |
1310 | ||
b77e38aa SR |
1311 | entry = debugfs_create_file("set_event", 0644, d_tracer, |
1312 | (void *)&show_set_event_seq_ops, | |
1313 | &ftrace_set_event_fops); | |
1314 | if (!entry) | |
1315 | pr_warning("Could not create debugfs " | |
1316 | "'set_event' entry\n"); | |
1317 | ||
1473e441 SR |
1318 | d_events = event_trace_events_dir(); |
1319 | if (!d_events) | |
1320 | return 0; | |
1321 | ||
d1b182a8 SR |
1322 | /* ring buffer internal formats */ |
1323 | trace_create_file("header_page", 0444, d_events, | |
1324 | ring_buffer_print_page_header, | |
1325 | &ftrace_show_header_fops); | |
1326 | ||
1327 | trace_create_file("header_event", 0444, d_events, | |
1328 | ring_buffer_print_entry_header, | |
1329 | &ftrace_show_header_fops); | |
1330 | ||
8ae79a13 | 1331 | trace_create_file("enable", 0644, d_events, |
8f31bfe5 | 1332 | NULL, &ftrace_system_enable_fops); |
8ae79a13 | 1333 | |
8728fe50 LZ |
1334 | if (trace_define_common_fields()) |
1335 | pr_warning("tracing: Failed to allocate common fields"); | |
1336 | ||
6d723736 | 1337 | for_each_event(call, __start_ftrace_events, __stop_ftrace_events) { |
1473e441 SR |
1338 | /* The linker may leave blanks */ |
1339 | if (!call->name) | |
1340 | continue; | |
0405ab80 SR |
1341 | if (call->class->raw_init) { |
1342 | ret = call->class->raw_init(call); | |
f744bd57 JB |
1343 | if (ret < 0) { |
1344 | if (ret != -ENOSYS) | |
1345 | pr_warning("Could not initialize trace " | |
1346 | "point events/%s\n", call->name); | |
1347 | continue; | |
1348 | } | |
1349 | } | |
88f70d75 MH |
1350 | ret = event_create_dir(call, d_events, &ftrace_event_id_fops, |
1351 | &ftrace_enable_fops, | |
1352 | &ftrace_event_filter_fops, | |
1353 | &ftrace_event_format_fops); | |
1354 | if (!ret) | |
1355 | list_add(&call->list, &ftrace_events); | |
1473e441 SR |
1356 | } |
1357 | ||
020e5f85 LZ |
1358 | while (true) { |
1359 | token = strsep(&buf, ","); | |
1360 | ||
1361 | if (!token) | |
1362 | break; | |
1363 | if (!*token) | |
1364 | continue; | |
1365 | ||
1366 | ret = ftrace_set_clr_event(token, 1); | |
1367 | if (ret) | |
1368 | pr_warning("Failed to enable trace event: %s\n", token); | |
1369 | } | |
1370 | ||
6d723736 | 1371 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 1372 | if (ret) |
6d723736 SR |
1373 | pr_warning("Failed to register trace events module notifier\n"); |
1374 | ||
b77e38aa SR |
1375 | return 0; |
1376 | } | |
1377 | fs_initcall(event_trace_init); | |
e6187007 SR |
1378 | |
1379 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1380 | ||
1381 | static DEFINE_SPINLOCK(test_spinlock); | |
1382 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
1383 | static DEFINE_MUTEX(test_mutex); | |
1384 | ||
1385 | static __init void test_work(struct work_struct *dummy) | |
1386 | { | |
1387 | spin_lock(&test_spinlock); | |
1388 | spin_lock_irq(&test_spinlock_irq); | |
1389 | udelay(1); | |
1390 | spin_unlock_irq(&test_spinlock_irq); | |
1391 | spin_unlock(&test_spinlock); | |
1392 | ||
1393 | mutex_lock(&test_mutex); | |
1394 | msleep(1); | |
1395 | mutex_unlock(&test_mutex); | |
1396 | } | |
1397 | ||
1398 | static __init int event_test_thread(void *unused) | |
1399 | { | |
1400 | void *test_malloc; | |
1401 | ||
1402 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
1403 | if (!test_malloc) | |
1404 | pr_info("failed to kmalloc\n"); | |
1405 | ||
1406 | schedule_on_each_cpu(test_work); | |
1407 | ||
1408 | kfree(test_malloc); | |
1409 | ||
1410 | set_current_state(TASK_INTERRUPTIBLE); | |
1411 | while (!kthread_should_stop()) | |
1412 | schedule(); | |
1413 | ||
1414 | return 0; | |
1415 | } | |
1416 | ||
1417 | /* | |
1418 | * Do various things that may trigger events. | |
1419 | */ | |
1420 | static __init void event_test_stuff(void) | |
1421 | { | |
1422 | struct task_struct *test_thread; | |
1423 | ||
1424 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
1425 | msleep(1); | |
1426 | kthread_stop(test_thread); | |
1427 | } | |
1428 | ||
1429 | /* | |
1430 | * For every trace event defined, we will test each trace point separately, | |
1431 | * and then by groups, and finally all trace points. | |
1432 | */ | |
9ea21c1e | 1433 | static __init void event_trace_self_tests(void) |
e6187007 SR |
1434 | { |
1435 | struct ftrace_event_call *call; | |
1436 | struct event_subsystem *system; | |
e6187007 SR |
1437 | int ret; |
1438 | ||
1439 | pr_info("Running tests on trace events:\n"); | |
1440 | ||
1441 | list_for_each_entry(call, &ftrace_events, list) { | |
1442 | ||
2239291a SR |
1443 | /* Only test those that have a probe */ |
1444 | if (!call->class || !call->class->probe) | |
e6187007 SR |
1445 | continue; |
1446 | ||
1f5a6b45 SR |
1447 | /* |
1448 | * Testing syscall events here is pretty useless, but | |
1449 | * we still do it if configured. But this is time consuming. | |
1450 | * What we really need is a user thread to perform the | |
1451 | * syscalls as we test. | |
1452 | */ | |
1453 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
1454 | if (call->class->system && |
1455 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
1456 | continue; |
1457 | #endif | |
1458 | ||
e6187007 SR |
1459 | pr_info("Testing event %s: ", call->name); |
1460 | ||
1461 | /* | |
1462 | * If an event is already enabled, someone is using | |
1463 | * it and the self test should not be on. | |
1464 | */ | |
553552ce | 1465 | if (call->flags & TRACE_EVENT_FL_ENABLED) { |
e6187007 SR |
1466 | pr_warning("Enabled event during self test!\n"); |
1467 | WARN_ON_ONCE(1); | |
1468 | continue; | |
1469 | } | |
1470 | ||
0e907c99 | 1471 | ftrace_event_enable_disable(call, 1); |
e6187007 | 1472 | event_test_stuff(); |
0e907c99 | 1473 | ftrace_event_enable_disable(call, 0); |
e6187007 SR |
1474 | |
1475 | pr_cont("OK\n"); | |
1476 | } | |
1477 | ||
1478 | /* Now test at the sub system level */ | |
1479 | ||
1480 | pr_info("Running tests on trace event systems:\n"); | |
1481 | ||
1482 | list_for_each_entry(system, &event_subsystems, list) { | |
1483 | ||
1484 | /* the ftrace system is special, skip it */ | |
1485 | if (strcmp(system->name, "ftrace") == 0) | |
1486 | continue; | |
1487 | ||
1488 | pr_info("Testing event system %s: ", system->name); | |
1489 | ||
8f31bfe5 | 1490 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1); |
e6187007 SR |
1491 | if (WARN_ON_ONCE(ret)) { |
1492 | pr_warning("error enabling system %s\n", | |
1493 | system->name); | |
1494 | continue; | |
1495 | } | |
1496 | ||
1497 | event_test_stuff(); | |
1498 | ||
8f31bfe5 | 1499 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0); |
e6187007 SR |
1500 | if (WARN_ON_ONCE(ret)) |
1501 | pr_warning("error disabling system %s\n", | |
1502 | system->name); | |
1503 | ||
1504 | pr_cont("OK\n"); | |
1505 | } | |
1506 | ||
1507 | /* Test with all events enabled */ | |
1508 | ||
1509 | pr_info("Running tests on all trace events:\n"); | |
1510 | pr_info("Testing all events: "); | |
1511 | ||
8f31bfe5 | 1512 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1); |
e6187007 | 1513 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 1514 | pr_warning("error enabling all events\n"); |
9ea21c1e | 1515 | return; |
e6187007 SR |
1516 | } |
1517 | ||
1518 | event_test_stuff(); | |
1519 | ||
1520 | /* reset sysname */ | |
8f31bfe5 | 1521 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0); |
e6187007 SR |
1522 | if (WARN_ON_ONCE(ret)) { |
1523 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 1524 | return; |
e6187007 SR |
1525 | } |
1526 | ||
1527 | pr_cont("OK\n"); | |
9ea21c1e SR |
1528 | } |
1529 | ||
1530 | #ifdef CONFIG_FUNCTION_TRACER | |
1531 | ||
245b2e70 | 1532 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e SR |
1533 | |
1534 | static void | |
1535 | function_test_events_call(unsigned long ip, unsigned long parent_ip) | |
1536 | { | |
1537 | struct ring_buffer_event *event; | |
e77405ad | 1538 | struct ring_buffer *buffer; |
9ea21c1e SR |
1539 | struct ftrace_entry *entry; |
1540 | unsigned long flags; | |
1541 | long disabled; | |
9ea21c1e SR |
1542 | int cpu; |
1543 | int pc; | |
1544 | ||
1545 | pc = preempt_count(); | |
5168ae50 | 1546 | preempt_disable_notrace(); |
9ea21c1e | 1547 | cpu = raw_smp_processor_id(); |
245b2e70 | 1548 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
1549 | |
1550 | if (disabled != 1) | |
1551 | goto out; | |
1552 | ||
1553 | local_save_flags(flags); | |
1554 | ||
e77405ad SR |
1555 | event = trace_current_buffer_lock_reserve(&buffer, |
1556 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
1557 | flags, pc); |
1558 | if (!event) | |
1559 | goto out; | |
1560 | entry = ring_buffer_event_data(event); | |
1561 | entry->ip = ip; | |
1562 | entry->parent_ip = parent_ip; | |
1563 | ||
e77405ad | 1564 | trace_nowake_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
1565 | |
1566 | out: | |
245b2e70 | 1567 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 1568 | preempt_enable_notrace(); |
9ea21c1e SR |
1569 | } |
1570 | ||
1571 | static struct ftrace_ops trace_ops __initdata = | |
1572 | { | |
1573 | .func = function_test_events_call, | |
1574 | }; | |
1575 | ||
1576 | static __init void event_trace_self_test_with_function(void) | |
1577 | { | |
1578 | register_ftrace_function(&trace_ops); | |
1579 | pr_info("Running tests again, along with the function tracer\n"); | |
1580 | event_trace_self_tests(); | |
1581 | unregister_ftrace_function(&trace_ops); | |
1582 | } | |
1583 | #else | |
1584 | static __init void event_trace_self_test_with_function(void) | |
1585 | { | |
1586 | } | |
1587 | #endif | |
1588 | ||
1589 | static __init int event_trace_self_tests_init(void) | |
1590 | { | |
020e5f85 LZ |
1591 | if (!tracing_selftest_disabled) { |
1592 | event_trace_self_tests(); | |
1593 | event_trace_self_test_with_function(); | |
1594 | } | |
e6187007 SR |
1595 | |
1596 | return 0; | |
1597 | } | |
1598 | ||
28d20e2d | 1599 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
1600 | |
1601 | #endif |