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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> | |
e6187007 | 18 | #include <linux/delay.h> |
b77e38aa | 19 | |
020e5f85 LZ |
20 | #include <asm/setup.h> |
21 | ||
91729ef9 | 22 | #include "trace_output.h" |
b77e38aa | 23 | |
4e5292ea | 24 | #undef TRACE_SYSTEM |
b628b3e6 SR |
25 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
26 | ||
20c8928a | 27 | DEFINE_MUTEX(event_mutex); |
11a241a3 | 28 | |
a59fd602 SR |
29 | LIST_HEAD(ftrace_events); |
30 | ||
540b7b8d | 31 | int trace_define_field(struct ftrace_event_call *call, const char *type, |
43b51ead LZ |
32 | const char *name, int offset, int size, int is_signed, |
33 | int filter_type) | |
cf027f64 TZ |
34 | { |
35 | struct ftrace_event_field *field; | |
36 | ||
fe9f57f2 | 37 | field = kzalloc(sizeof(*field), GFP_KERNEL); |
cf027f64 TZ |
38 | if (!field) |
39 | goto err; | |
fe9f57f2 | 40 | |
cf027f64 TZ |
41 | field->name = kstrdup(name, GFP_KERNEL); |
42 | if (!field->name) | |
43 | goto err; | |
fe9f57f2 | 44 | |
cf027f64 TZ |
45 | field->type = kstrdup(type, GFP_KERNEL); |
46 | if (!field->type) | |
47 | goto err; | |
fe9f57f2 | 48 | |
43b51ead LZ |
49 | if (filter_type == FILTER_OTHER) |
50 | field->filter_type = filter_assign_type(type); | |
51 | else | |
52 | field->filter_type = filter_type; | |
53 | ||
cf027f64 TZ |
54 | field->offset = offset; |
55 | field->size = size; | |
a118e4d1 | 56 | field->is_signed = is_signed; |
aa38e9fc | 57 | |
cf027f64 TZ |
58 | list_add(&field->link, &call->fields); |
59 | ||
60 | return 0; | |
fe9f57f2 | 61 | |
cf027f64 TZ |
62 | err: |
63 | if (field) { | |
64 | kfree(field->name); | |
65 | kfree(field->type); | |
66 | } | |
67 | kfree(field); | |
fe9f57f2 | 68 | |
cf027f64 TZ |
69 | return -ENOMEM; |
70 | } | |
17c873ec | 71 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 72 | |
e647d6b3 LZ |
73 | #define __common_field(type, item) \ |
74 | ret = trace_define_field(call, #type, "common_" #item, \ | |
75 | offsetof(typeof(ent), item), \ | |
76 | sizeof(ent.item), \ | |
43b51ead | 77 | is_signed_type(type), FILTER_OTHER); \ |
e647d6b3 LZ |
78 | if (ret) \ |
79 | return ret; | |
80 | ||
81 | int trace_define_common_fields(struct ftrace_event_call *call) | |
82 | { | |
83 | int ret; | |
84 | struct trace_entry ent; | |
85 | ||
86 | __common_field(unsigned short, type); | |
87 | __common_field(unsigned char, flags); | |
88 | __common_field(unsigned char, preempt_count); | |
89 | __common_field(int, pid); | |
637e7e86 | 90 | __common_field(int, lock_depth); |
e647d6b3 LZ |
91 | |
92 | return ret; | |
93 | } | |
540b7b8d | 94 | EXPORT_SYMBOL_GPL(trace_define_common_fields); |
e647d6b3 | 95 | |
2df75e41 LZ |
96 | #ifdef CONFIG_MODULES |
97 | ||
98 | static void trace_destroy_fields(struct ftrace_event_call *call) | |
99 | { | |
100 | struct ftrace_event_field *field, *next; | |
101 | ||
102 | list_for_each_entry_safe(field, next, &call->fields, link) { | |
103 | list_del(&field->link); | |
104 | kfree(field->type); | |
105 | kfree(field->name); | |
106 | kfree(field); | |
107 | } | |
108 | } | |
109 | ||
110 | #endif /* CONFIG_MODULES */ | |
111 | ||
fd994989 SR |
112 | static void ftrace_event_enable_disable(struct ftrace_event_call *call, |
113 | int enable) | |
114 | { | |
fd994989 SR |
115 | switch (enable) { |
116 | case 0: | |
117 | if (call->enabled) { | |
118 | call->enabled = 0; | |
b11c53e1 | 119 | tracing_stop_cmdline_record(); |
69fd4f0e | 120 | call->unregfunc(call->data); |
fd994989 | 121 | } |
fd994989 SR |
122 | break; |
123 | case 1: | |
da4d0302 | 124 | if (!call->enabled) { |
fd994989 | 125 | call->enabled = 1; |
b11c53e1 | 126 | tracing_start_cmdline_record(); |
69fd4f0e | 127 | call->regfunc(call->data); |
fd994989 | 128 | } |
fd994989 SR |
129 | break; |
130 | } | |
131 | } | |
132 | ||
0e907c99 Z |
133 | static void ftrace_clear_events(void) |
134 | { | |
135 | struct ftrace_event_call *call; | |
136 | ||
137 | mutex_lock(&event_mutex); | |
138 | list_for_each_entry(call, &ftrace_events, list) { | |
139 | ftrace_event_enable_disable(call, 0); | |
140 | } | |
141 | mutex_unlock(&event_mutex); | |
142 | } | |
143 | ||
8f31bfe5 LZ |
144 | /* |
145 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
146 | */ | |
147 | static int __ftrace_set_clr_event(const char *match, const char *sub, | |
148 | const char *event, int set) | |
b77e38aa | 149 | { |
a59fd602 | 150 | struct ftrace_event_call *call; |
29f93943 | 151 | int ret = -EINVAL; |
8f31bfe5 LZ |
152 | |
153 | mutex_lock(&event_mutex); | |
154 | list_for_each_entry(call, &ftrace_events, list) { | |
155 | ||
156 | if (!call->name || !call->regfunc) | |
157 | continue; | |
158 | ||
159 | if (match && | |
160 | strcmp(match, call->name) != 0 && | |
161 | strcmp(match, call->system) != 0) | |
162 | continue; | |
163 | ||
164 | if (sub && strcmp(sub, call->system) != 0) | |
165 | continue; | |
166 | ||
167 | if (event && strcmp(event, call->name) != 0) | |
168 | continue; | |
169 | ||
170 | ftrace_event_enable_disable(call, set); | |
171 | ||
172 | ret = 0; | |
173 | } | |
174 | mutex_unlock(&event_mutex); | |
175 | ||
176 | return ret; | |
177 | } | |
178 | ||
179 | static int ftrace_set_clr_event(char *buf, int set) | |
180 | { | |
b628b3e6 | 181 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
182 | |
183 | /* | |
184 | * The buf format can be <subsystem>:<event-name> | |
185 | * *:<event-name> means any event by that name. | |
186 | * :<event-name> is the same. | |
187 | * | |
188 | * <subsystem>:* means all events in that subsystem | |
189 | * <subsystem>: means the same. | |
190 | * | |
191 | * <name> (no ':') means all events in a subsystem with | |
192 | * the name <name> or any event that matches <name> | |
193 | */ | |
194 | ||
195 | match = strsep(&buf, ":"); | |
196 | if (buf) { | |
197 | sub = match; | |
198 | event = buf; | |
199 | match = NULL; | |
200 | ||
201 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
202 | sub = NULL; | |
203 | if (!strlen(event) || strcmp(event, "*") == 0) | |
204 | event = NULL; | |
205 | } | |
b77e38aa | 206 | |
8f31bfe5 | 207 | return __ftrace_set_clr_event(match, sub, event, set); |
b77e38aa SR |
208 | } |
209 | ||
4671c794 SR |
210 | /** |
211 | * trace_set_clr_event - enable or disable an event | |
212 | * @system: system name to match (NULL for any system) | |
213 | * @event: event name to match (NULL for all events, within system) | |
214 | * @set: 1 to enable, 0 to disable | |
215 | * | |
216 | * This is a way for other parts of the kernel to enable or disable | |
217 | * event recording. | |
218 | * | |
219 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
220 | * registered events. | |
221 | */ | |
222 | int trace_set_clr_event(const char *system, const char *event, int set) | |
223 | { | |
224 | return __ftrace_set_clr_event(NULL, system, event, set); | |
225 | } | |
226 | ||
b77e38aa SR |
227 | /* 128 should be much more than enough */ |
228 | #define EVENT_BUF_SIZE 127 | |
229 | ||
230 | static ssize_t | |
231 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
232 | size_t cnt, loff_t *ppos) | |
233 | { | |
48966364 | 234 | struct trace_parser parser; |
4ba7978e | 235 | ssize_t read, ret; |
b77e38aa | 236 | |
4ba7978e | 237 | if (!cnt) |
b77e38aa SR |
238 | return 0; |
239 | ||
1852fcce SR |
240 | ret = tracing_update_buffers(); |
241 | if (ret < 0) | |
242 | return ret; | |
243 | ||
48966364 | 244 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
245 | return -ENOMEM; |
246 | ||
48966364 | 247 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
248 | ||
4ba7978e | 249 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 250 | int set = 1; |
b77e38aa | 251 | |
48966364 | 252 | if (*parser.buffer == '!') |
b77e38aa | 253 | set = 0; |
b77e38aa | 254 | |
48966364 | 255 | parser.buffer[parser.idx] = 0; |
256 | ||
257 | ret = ftrace_set_clr_event(parser.buffer + !set, set); | |
b77e38aa | 258 | if (ret) |
48966364 | 259 | goto out_put; |
b77e38aa | 260 | } |
b77e38aa SR |
261 | |
262 | ret = read; | |
263 | ||
48966364 | 264 | out_put: |
265 | trace_parser_put(&parser); | |
b77e38aa SR |
266 | |
267 | return ret; | |
268 | } | |
269 | ||
270 | static void * | |
271 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
272 | { | |
30bd39cd | 273 | struct ftrace_event_call *call = v; |
b77e38aa SR |
274 | |
275 | (*pos)++; | |
276 | ||
30bd39cd | 277 | list_for_each_entry_continue(call, &ftrace_events, list) { |
40e26815 SR |
278 | /* |
279 | * The ftrace subsystem is for showing formats only. | |
280 | * They can not be enabled or disabled via the event files. | |
281 | */ | |
282 | if (call->regfunc) | |
30bd39cd | 283 | return call; |
40e26815 | 284 | } |
b77e38aa | 285 | |
30bd39cd | 286 | return NULL; |
b77e38aa SR |
287 | } |
288 | ||
289 | static void *t_start(struct seq_file *m, loff_t *pos) | |
290 | { | |
30bd39cd | 291 | struct ftrace_event_call *call; |
e1c7e2a6 LZ |
292 | loff_t l; |
293 | ||
20c8928a | 294 | mutex_lock(&event_mutex); |
e1c7e2a6 | 295 | |
30bd39cd | 296 | call = list_entry(&ftrace_events, struct ftrace_event_call, list); |
e1c7e2a6 | 297 | for (l = 0; l <= *pos; ) { |
30bd39cd | 298 | call = t_next(m, call, &l); |
e1c7e2a6 LZ |
299 | if (!call) |
300 | break; | |
301 | } | |
302 | return call; | |
b77e38aa SR |
303 | } |
304 | ||
305 | static void * | |
306 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
307 | { | |
30bd39cd | 308 | struct ftrace_event_call *call = v; |
b77e38aa SR |
309 | |
310 | (*pos)++; | |
311 | ||
30bd39cd LZ |
312 | list_for_each_entry_continue(call, &ftrace_events, list) { |
313 | if (call->enabled) | |
314 | return call; | |
b77e38aa SR |
315 | } |
316 | ||
30bd39cd | 317 | return NULL; |
b77e38aa SR |
318 | } |
319 | ||
320 | static void *s_start(struct seq_file *m, loff_t *pos) | |
321 | { | |
30bd39cd | 322 | struct ftrace_event_call *call; |
e1c7e2a6 LZ |
323 | loff_t l; |
324 | ||
20c8928a | 325 | mutex_lock(&event_mutex); |
e1c7e2a6 | 326 | |
30bd39cd | 327 | call = list_entry(&ftrace_events, struct ftrace_event_call, list); |
e1c7e2a6 | 328 | for (l = 0; l <= *pos; ) { |
30bd39cd | 329 | call = s_next(m, call, &l); |
e1c7e2a6 LZ |
330 | if (!call) |
331 | break; | |
332 | } | |
333 | return call; | |
b77e38aa SR |
334 | } |
335 | ||
336 | static int t_show(struct seq_file *m, void *v) | |
337 | { | |
338 | struct ftrace_event_call *call = v; | |
339 | ||
b628b3e6 SR |
340 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
341 | seq_printf(m, "%s:", call->system); | |
b77e38aa SR |
342 | seq_printf(m, "%s\n", call->name); |
343 | ||
344 | return 0; | |
345 | } | |
346 | ||
347 | static void t_stop(struct seq_file *m, void *p) | |
348 | { | |
20c8928a | 349 | mutex_unlock(&event_mutex); |
b77e38aa SR |
350 | } |
351 | ||
352 | static int | |
353 | ftrace_event_seq_open(struct inode *inode, struct file *file) | |
354 | { | |
b77e38aa SR |
355 | const struct seq_operations *seq_ops; |
356 | ||
357 | if ((file->f_mode & FMODE_WRITE) && | |
8650ae32 | 358 | (file->f_flags & O_TRUNC)) |
b77e38aa SR |
359 | ftrace_clear_events(); |
360 | ||
361 | seq_ops = inode->i_private; | |
20c8928a | 362 | return seq_open(file, seq_ops); |
b77e38aa SR |
363 | } |
364 | ||
1473e441 SR |
365 | static ssize_t |
366 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
367 | loff_t *ppos) | |
368 | { | |
369 | struct ftrace_event_call *call = filp->private_data; | |
370 | char *buf; | |
371 | ||
da4d0302 | 372 | if (call->enabled) |
1473e441 SR |
373 | buf = "1\n"; |
374 | else | |
375 | buf = "0\n"; | |
376 | ||
377 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
378 | } | |
379 | ||
380 | static ssize_t | |
381 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
382 | loff_t *ppos) | |
383 | { | |
384 | struct ftrace_event_call *call = filp->private_data; | |
385 | char buf[64]; | |
386 | unsigned long val; | |
387 | int ret; | |
388 | ||
389 | if (cnt >= sizeof(buf)) | |
390 | return -EINVAL; | |
391 | ||
392 | if (copy_from_user(&buf, ubuf, cnt)) | |
393 | return -EFAULT; | |
394 | ||
395 | buf[cnt] = 0; | |
396 | ||
397 | ret = strict_strtoul(buf, 10, &val); | |
398 | if (ret < 0) | |
399 | return ret; | |
400 | ||
1852fcce SR |
401 | ret = tracing_update_buffers(); |
402 | if (ret < 0) | |
403 | return ret; | |
404 | ||
1473e441 SR |
405 | switch (val) { |
406 | case 0: | |
1473e441 | 407 | case 1: |
11a241a3 | 408 | mutex_lock(&event_mutex); |
fd994989 | 409 | ftrace_event_enable_disable(call, val); |
11a241a3 | 410 | mutex_unlock(&event_mutex); |
1473e441 SR |
411 | break; |
412 | ||
413 | default: | |
414 | return -EINVAL; | |
415 | } | |
416 | ||
417 | *ppos += cnt; | |
418 | ||
419 | return cnt; | |
420 | } | |
421 | ||
8ae79a13 SR |
422 | static ssize_t |
423 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
424 | loff_t *ppos) | |
425 | { | |
c142b15d | 426 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
8ae79a13 SR |
427 | const char *system = filp->private_data; |
428 | struct ftrace_event_call *call; | |
429 | char buf[2]; | |
c142b15d | 430 | int set = 0; |
8ae79a13 SR |
431 | int ret; |
432 | ||
8ae79a13 SR |
433 | mutex_lock(&event_mutex); |
434 | list_for_each_entry(call, &ftrace_events, list) { | |
435 | if (!call->name || !call->regfunc) | |
436 | continue; | |
437 | ||
8f31bfe5 | 438 | if (system && strcmp(call->system, system) != 0) |
8ae79a13 SR |
439 | continue; |
440 | ||
441 | /* | |
442 | * We need to find out if all the events are set | |
443 | * or if all events or cleared, or if we have | |
444 | * a mixture. | |
445 | */ | |
c142b15d LZ |
446 | set |= (1 << !!call->enabled); |
447 | ||
8ae79a13 SR |
448 | /* |
449 | * If we have a mixture, no need to look further. | |
450 | */ | |
c142b15d | 451 | if (set == 3) |
8ae79a13 SR |
452 | break; |
453 | } | |
454 | mutex_unlock(&event_mutex); | |
455 | ||
c142b15d | 456 | buf[0] = set_to_char[set]; |
8ae79a13 | 457 | buf[1] = '\n'; |
8ae79a13 SR |
458 | |
459 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
460 | ||
461 | return ret; | |
462 | } | |
463 | ||
464 | static ssize_t | |
465 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
466 | loff_t *ppos) | |
467 | { | |
468 | const char *system = filp->private_data; | |
469 | unsigned long val; | |
8ae79a13 SR |
470 | char buf[64]; |
471 | ssize_t ret; | |
472 | ||
473 | if (cnt >= sizeof(buf)) | |
474 | return -EINVAL; | |
475 | ||
476 | if (copy_from_user(&buf, ubuf, cnt)) | |
477 | return -EFAULT; | |
478 | ||
479 | buf[cnt] = 0; | |
480 | ||
481 | ret = strict_strtoul(buf, 10, &val); | |
482 | if (ret < 0) | |
483 | return ret; | |
484 | ||
485 | ret = tracing_update_buffers(); | |
486 | if (ret < 0) | |
487 | return ret; | |
488 | ||
8f31bfe5 | 489 | if (val != 0 && val != 1) |
8ae79a13 | 490 | return -EINVAL; |
8ae79a13 | 491 | |
8f31bfe5 | 492 | ret = __ftrace_set_clr_event(NULL, system, NULL, val); |
8ae79a13 | 493 | if (ret) |
8f31bfe5 | 494 | goto out; |
8ae79a13 SR |
495 | |
496 | ret = cnt; | |
497 | ||
8f31bfe5 | 498 | out: |
8ae79a13 SR |
499 | *ppos += cnt; |
500 | ||
501 | return ret; | |
502 | } | |
503 | ||
75db37d2 SR |
504 | extern char *__bad_type_size(void); |
505 | ||
91729ef9 | 506 | #undef FIELD |
156b5f17 | 507 | #define FIELD(type, name) \ |
75db37d2 | 508 | sizeof(type) != sizeof(field.name) ? __bad_type_size() : \ |
cf027f64 TZ |
509 | #type, "common_" #name, offsetof(typeof(field), name), \ |
510 | sizeof(field.name) | |
91729ef9 SR |
511 | |
512 | static int trace_write_header(struct trace_seq *s) | |
513 | { | |
514 | struct trace_entry field; | |
515 | ||
516 | /* struct trace_entry */ | |
517 | return trace_seq_printf(s, | |
ce8eb2bf SR |
518 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" |
519 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
520 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
521 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
637e7e86 | 522 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" |
91729ef9 | 523 | "\n", |
89ec0dee | 524 | FIELD(unsigned short, type), |
91729ef9 SR |
525 | FIELD(unsigned char, flags), |
526 | FIELD(unsigned char, preempt_count), | |
637e7e86 SR |
527 | FIELD(int, pid), |
528 | FIELD(int, lock_depth)); | |
91729ef9 | 529 | } |
da4d0302 | 530 | |
981d081e SR |
531 | static ssize_t |
532 | event_format_read(struct file *filp, char __user *ubuf, size_t cnt, | |
533 | loff_t *ppos) | |
534 | { | |
535 | struct ftrace_event_call *call = filp->private_data; | |
536 | struct trace_seq *s; | |
537 | char *buf; | |
538 | int r; | |
539 | ||
c269fc8c TZ |
540 | if (*ppos) |
541 | return 0; | |
542 | ||
981d081e SR |
543 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
544 | if (!s) | |
545 | return -ENOMEM; | |
546 | ||
547 | trace_seq_init(s); | |
548 | ||
c5e4e192 SR |
549 | /* If any of the first writes fail, so will the show_format. */ |
550 | ||
551 | trace_seq_printf(s, "name: %s\n", call->name); | |
552 | trace_seq_printf(s, "ID: %d\n", call->id); | |
553 | trace_seq_printf(s, "format:\n"); | |
91729ef9 SR |
554 | trace_write_header(s); |
555 | ||
e8f9f4d7 | 556 | r = call->show_format(call, s); |
981d081e SR |
557 | if (!r) { |
558 | /* | |
559 | * ug! The format output is bigger than a PAGE!! | |
560 | */ | |
561 | buf = "FORMAT TOO BIG\n"; | |
562 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
563 | buf, strlen(buf)); | |
564 | goto out; | |
565 | } | |
566 | ||
567 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
568 | s->buffer, s->len); | |
569 | out: | |
570 | kfree(s); | |
571 | return r; | |
572 | } | |
573 | ||
23725aee PZ |
574 | static ssize_t |
575 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
576 | { | |
577 | struct ftrace_event_call *call = filp->private_data; | |
578 | struct trace_seq *s; | |
579 | int r; | |
580 | ||
581 | if (*ppos) | |
582 | return 0; | |
583 | ||
584 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
585 | if (!s) | |
586 | return -ENOMEM; | |
587 | ||
588 | trace_seq_init(s); | |
589 | trace_seq_printf(s, "%d\n", call->id); | |
590 | ||
591 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
592 | s->buffer, s->len); | |
593 | kfree(s); | |
594 | return r; | |
595 | } | |
596 | ||
7ce7e424 TZ |
597 | static ssize_t |
598 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
599 | loff_t *ppos) | |
600 | { | |
601 | struct ftrace_event_call *call = filp->private_data; | |
602 | struct trace_seq *s; | |
603 | int r; | |
604 | ||
605 | if (*ppos) | |
606 | return 0; | |
607 | ||
608 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
609 | if (!s) | |
610 | return -ENOMEM; | |
611 | ||
612 | trace_seq_init(s); | |
613 | ||
8b372562 | 614 | print_event_filter(call, s); |
4bda2d51 | 615 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
616 | |
617 | kfree(s); | |
618 | ||
619 | return r; | |
620 | } | |
621 | ||
622 | static ssize_t | |
623 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
624 | loff_t *ppos) | |
625 | { | |
626 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 627 | char *buf; |
7ce7e424 TZ |
628 | int err; |
629 | ||
8b372562 | 630 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
631 | return -EINVAL; |
632 | ||
8b372562 TZ |
633 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
634 | if (!buf) | |
7ce7e424 TZ |
635 | return -ENOMEM; |
636 | ||
8b372562 TZ |
637 | if (copy_from_user(buf, ubuf, cnt)) { |
638 | free_page((unsigned long) buf); | |
639 | return -EFAULT; | |
7ce7e424 | 640 | } |
8b372562 | 641 | buf[cnt] = '\0'; |
7ce7e424 | 642 | |
8b372562 TZ |
643 | err = apply_event_filter(call, buf); |
644 | free_page((unsigned long) buf); | |
645 | if (err < 0) | |
44e9c8b7 | 646 | return err; |
0a19e53c | 647 | |
7ce7e424 TZ |
648 | *ppos += cnt; |
649 | ||
650 | return cnt; | |
651 | } | |
652 | ||
cfb180f3 TZ |
653 | static ssize_t |
654 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
655 | loff_t *ppos) | |
656 | { | |
657 | struct event_subsystem *system = filp->private_data; | |
658 | struct trace_seq *s; | |
659 | int r; | |
660 | ||
661 | if (*ppos) | |
662 | return 0; | |
663 | ||
664 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
665 | if (!s) | |
666 | return -ENOMEM; | |
667 | ||
668 | trace_seq_init(s); | |
669 | ||
8b372562 | 670 | print_subsystem_event_filter(system, s); |
4bda2d51 | 671 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
672 | |
673 | kfree(s); | |
674 | ||
675 | return r; | |
676 | } | |
677 | ||
678 | static ssize_t | |
679 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
680 | loff_t *ppos) | |
681 | { | |
682 | struct event_subsystem *system = filp->private_data; | |
8b372562 | 683 | char *buf; |
cfb180f3 TZ |
684 | int err; |
685 | ||
8b372562 | 686 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
687 | return -EINVAL; |
688 | ||
8b372562 TZ |
689 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
690 | if (!buf) | |
cfb180f3 TZ |
691 | return -ENOMEM; |
692 | ||
8b372562 TZ |
693 | if (copy_from_user(buf, ubuf, cnt)) { |
694 | free_page((unsigned long) buf); | |
695 | return -EFAULT; | |
cfb180f3 | 696 | } |
8b372562 | 697 | buf[cnt] = '\0'; |
cfb180f3 | 698 | |
8b372562 TZ |
699 | err = apply_subsystem_event_filter(system, buf); |
700 | free_page((unsigned long) buf); | |
701 | if (err < 0) | |
44e9c8b7 | 702 | return err; |
cfb180f3 TZ |
703 | |
704 | *ppos += cnt; | |
705 | ||
706 | return cnt; | |
707 | } | |
708 | ||
d1b182a8 SR |
709 | static ssize_t |
710 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
711 | { | |
712 | int (*func)(struct trace_seq *s) = filp->private_data; | |
713 | struct trace_seq *s; | |
714 | int r; | |
715 | ||
716 | if (*ppos) | |
717 | return 0; | |
718 | ||
719 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
720 | if (!s) | |
721 | return -ENOMEM; | |
722 | ||
723 | trace_seq_init(s); | |
724 | ||
725 | func(s); | |
726 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
727 | ||
728 | kfree(s); | |
729 | ||
730 | return r; | |
731 | } | |
732 | ||
b77e38aa SR |
733 | static const struct seq_operations show_event_seq_ops = { |
734 | .start = t_start, | |
735 | .next = t_next, | |
736 | .show = t_show, | |
737 | .stop = t_stop, | |
738 | }; | |
739 | ||
740 | static const struct seq_operations show_set_event_seq_ops = { | |
741 | .start = s_start, | |
742 | .next = s_next, | |
743 | .show = t_show, | |
744 | .stop = t_stop, | |
745 | }; | |
746 | ||
2314c4ae SR |
747 | static const struct file_operations ftrace_avail_fops = { |
748 | .open = ftrace_event_seq_open, | |
749 | .read = seq_read, | |
750 | .llseek = seq_lseek, | |
751 | .release = seq_release, | |
752 | }; | |
753 | ||
b77e38aa SR |
754 | static const struct file_operations ftrace_set_event_fops = { |
755 | .open = ftrace_event_seq_open, | |
756 | .read = seq_read, | |
757 | .write = ftrace_event_write, | |
758 | .llseek = seq_lseek, | |
759 | .release = seq_release, | |
760 | }; | |
761 | ||
1473e441 SR |
762 | static const struct file_operations ftrace_enable_fops = { |
763 | .open = tracing_open_generic, | |
764 | .read = event_enable_read, | |
765 | .write = event_enable_write, | |
766 | }; | |
767 | ||
981d081e SR |
768 | static const struct file_operations ftrace_event_format_fops = { |
769 | .open = tracing_open_generic, | |
770 | .read = event_format_read, | |
771 | }; | |
772 | ||
23725aee PZ |
773 | static const struct file_operations ftrace_event_id_fops = { |
774 | .open = tracing_open_generic, | |
775 | .read = event_id_read, | |
776 | }; | |
777 | ||
7ce7e424 TZ |
778 | static const struct file_operations ftrace_event_filter_fops = { |
779 | .open = tracing_open_generic, | |
780 | .read = event_filter_read, | |
781 | .write = event_filter_write, | |
782 | }; | |
783 | ||
cfb180f3 TZ |
784 | static const struct file_operations ftrace_subsystem_filter_fops = { |
785 | .open = tracing_open_generic, | |
786 | .read = subsystem_filter_read, | |
787 | .write = subsystem_filter_write, | |
788 | }; | |
789 | ||
8ae79a13 SR |
790 | static const struct file_operations ftrace_system_enable_fops = { |
791 | .open = tracing_open_generic, | |
792 | .read = system_enable_read, | |
793 | .write = system_enable_write, | |
794 | }; | |
795 | ||
d1b182a8 SR |
796 | static const struct file_operations ftrace_show_header_fops = { |
797 | .open = tracing_open_generic, | |
798 | .read = show_header, | |
799 | }; | |
800 | ||
1473e441 SR |
801 | static struct dentry *event_trace_events_dir(void) |
802 | { | |
803 | static struct dentry *d_tracer; | |
804 | static struct dentry *d_events; | |
805 | ||
806 | if (d_events) | |
807 | return d_events; | |
808 | ||
809 | d_tracer = tracing_init_dentry(); | |
810 | if (!d_tracer) | |
811 | return NULL; | |
812 | ||
813 | d_events = debugfs_create_dir("events", d_tracer); | |
814 | if (!d_events) | |
815 | pr_warning("Could not create debugfs " | |
816 | "'events' directory\n"); | |
817 | ||
818 | return d_events; | |
819 | } | |
820 | ||
6ecc2d1c SR |
821 | static LIST_HEAD(event_subsystems); |
822 | ||
823 | static struct dentry * | |
824 | event_subsystem_dir(const char *name, struct dentry *d_events) | |
825 | { | |
826 | struct event_subsystem *system; | |
e1112b4d | 827 | struct dentry *entry; |
6ecc2d1c SR |
828 | |
829 | /* First see if we did not already create this dir */ | |
830 | list_for_each_entry(system, &event_subsystems, list) { | |
dc82ec98 XG |
831 | if (strcmp(system->name, name) == 0) { |
832 | system->nr_events++; | |
6ecc2d1c | 833 | return system->entry; |
dc82ec98 | 834 | } |
6ecc2d1c SR |
835 | } |
836 | ||
837 | /* need to create new entry */ | |
838 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
839 | if (!system) { | |
840 | pr_warning("No memory to create event subsystem %s\n", | |
841 | name); | |
842 | return d_events; | |
843 | } | |
844 | ||
845 | system->entry = debugfs_create_dir(name, d_events); | |
846 | if (!system->entry) { | |
847 | pr_warning("Could not create event subsystem %s\n", | |
848 | name); | |
849 | kfree(system); | |
850 | return d_events; | |
851 | } | |
852 | ||
dc82ec98 | 853 | system->nr_events = 1; |
6d723736 SR |
854 | system->name = kstrdup(name, GFP_KERNEL); |
855 | if (!system->name) { | |
856 | debugfs_remove(system->entry); | |
857 | kfree(system); | |
858 | return d_events; | |
859 | } | |
860 | ||
6ecc2d1c SR |
861 | list_add(&system->list, &event_subsystems); |
862 | ||
30e673b2 | 863 | system->filter = NULL; |
cfb180f3 | 864 | |
8b372562 TZ |
865 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
866 | if (!system->filter) { | |
867 | pr_warning("Could not allocate filter for subsystem " | |
868 | "'%s'\n", name); | |
869 | return system->entry; | |
870 | } | |
871 | ||
e1112b4d TZ |
872 | entry = debugfs_create_file("filter", 0644, system->entry, system, |
873 | &ftrace_subsystem_filter_fops); | |
8b372562 TZ |
874 | if (!entry) { |
875 | kfree(system->filter); | |
876 | system->filter = NULL; | |
e1112b4d TZ |
877 | pr_warning("Could not create debugfs " |
878 | "'%s/filter' entry\n", name); | |
8b372562 | 879 | } |
e1112b4d | 880 | |
8ae79a13 SR |
881 | entry = trace_create_file("enable", 0644, system->entry, |
882 | (void *)system->name, | |
883 | &ftrace_system_enable_fops); | |
884 | ||
6ecc2d1c SR |
885 | return system->entry; |
886 | } | |
887 | ||
1473e441 | 888 | static int |
701970b3 SR |
889 | event_create_dir(struct ftrace_event_call *call, struct dentry *d_events, |
890 | const struct file_operations *id, | |
891 | const struct file_operations *enable, | |
892 | const struct file_operations *filter, | |
893 | const struct file_operations *format) | |
1473e441 SR |
894 | { |
895 | struct dentry *entry; | |
fd994989 | 896 | int ret; |
1473e441 | 897 | |
6ecc2d1c SR |
898 | /* |
899 | * If the trace point header did not define TRACE_SYSTEM | |
900 | * then the system would be called "TRACE_SYSTEM". | |
901 | */ | |
6d723736 | 902 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
6ecc2d1c SR |
903 | d_events = event_subsystem_dir(call->system, d_events); |
904 | ||
1473e441 SR |
905 | call->dir = debugfs_create_dir(call->name, d_events); |
906 | if (!call->dir) { | |
907 | pr_warning("Could not create debugfs " | |
908 | "'%s' directory\n", call->name); | |
909 | return -1; | |
910 | } | |
911 | ||
6d723736 SR |
912 | if (call->regfunc) |
913 | entry = trace_create_file("enable", 0644, call->dir, call, | |
701970b3 | 914 | enable); |
1473e441 | 915 | |
af6af30c | 916 | if (call->id && call->profile_enable) |
6d723736 | 917 | entry = trace_create_file("id", 0444, call->dir, call, |
701970b3 | 918 | id); |
23725aee | 919 | |
cf027f64 | 920 | if (call->define_fields) { |
14be96c9 | 921 | ret = call->define_fields(call); |
cf027f64 TZ |
922 | if (ret < 0) { |
923 | pr_warning("Could not initialize trace point" | |
924 | " events/%s\n", call->name); | |
925 | return ret; | |
926 | } | |
6d723736 | 927 | entry = trace_create_file("filter", 0644, call->dir, call, |
701970b3 | 928 | filter); |
cf027f64 TZ |
929 | } |
930 | ||
981d081e SR |
931 | /* A trace may not want to export its format */ |
932 | if (!call->show_format) | |
933 | return 0; | |
934 | ||
6d723736 | 935 | entry = trace_create_file("format", 0444, call->dir, call, |
701970b3 | 936 | format); |
6d723736 SR |
937 | |
938 | return 0; | |
939 | } | |
940 | ||
941 | #define for_each_event(event, start, end) \ | |
942 | for (event = start; \ | |
943 | (unsigned long)event < (unsigned long)end; \ | |
944 | event++) | |
945 | ||
61f919a1 | 946 | #ifdef CONFIG_MODULES |
701970b3 SR |
947 | |
948 | static LIST_HEAD(ftrace_module_file_list); | |
949 | ||
950 | /* | |
951 | * Modules must own their file_operations to keep up with | |
952 | * reference counting. | |
953 | */ | |
954 | struct ftrace_module_file_ops { | |
955 | struct list_head list; | |
956 | struct module *mod; | |
957 | struct file_operations id; | |
958 | struct file_operations enable; | |
959 | struct file_operations format; | |
960 | struct file_operations filter; | |
961 | }; | |
962 | ||
a2ca5e03 FW |
963 | static void remove_subsystem_dir(const char *name) |
964 | { | |
965 | struct event_subsystem *system; | |
966 | ||
967 | if (strcmp(name, TRACE_SYSTEM) == 0) | |
968 | return; | |
969 | ||
970 | list_for_each_entry(system, &event_subsystems, list) { | |
971 | if (strcmp(system->name, name) == 0) { | |
972 | if (!--system->nr_events) { | |
973 | struct event_filter *filter = system->filter; | |
974 | ||
975 | debugfs_remove_recursive(system->entry); | |
976 | list_del(&system->list); | |
977 | if (filter) { | |
978 | kfree(filter->filter_string); | |
979 | kfree(filter); | |
980 | } | |
981 | kfree(system->name); | |
982 | kfree(system); | |
983 | } | |
984 | break; | |
985 | } | |
986 | } | |
987 | } | |
988 | ||
701970b3 SR |
989 | static struct ftrace_module_file_ops * |
990 | trace_create_file_ops(struct module *mod) | |
991 | { | |
992 | struct ftrace_module_file_ops *file_ops; | |
993 | ||
994 | /* | |
995 | * This is a bit of a PITA. To allow for correct reference | |
996 | * counting, modules must "own" their file_operations. | |
997 | * To do this, we allocate the file operations that will be | |
998 | * used in the event directory. | |
999 | */ | |
1000 | ||
1001 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1002 | if (!file_ops) | |
1003 | return NULL; | |
1004 | ||
1005 | file_ops->mod = mod; | |
1006 | ||
1007 | file_ops->id = ftrace_event_id_fops; | |
1008 | file_ops->id.owner = mod; | |
1009 | ||
1010 | file_ops->enable = ftrace_enable_fops; | |
1011 | file_ops->enable.owner = mod; | |
1012 | ||
1013 | file_ops->filter = ftrace_event_filter_fops; | |
1014 | file_ops->filter.owner = mod; | |
1015 | ||
1016 | file_ops->format = ftrace_event_format_fops; | |
1017 | file_ops->format.owner = mod; | |
1018 | ||
1019 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1020 | ||
1021 | return file_ops; | |
1022 | } | |
1023 | ||
6d723736 SR |
1024 | static void trace_module_add_events(struct module *mod) |
1025 | { | |
701970b3 | 1026 | struct ftrace_module_file_ops *file_ops = NULL; |
6d723736 SR |
1027 | struct ftrace_event_call *call, *start, *end; |
1028 | struct dentry *d_events; | |
f744bd57 | 1029 | int ret; |
6d723736 SR |
1030 | |
1031 | start = mod->trace_events; | |
1032 | end = mod->trace_events + mod->num_trace_events; | |
1033 | ||
1034 | if (start == end) | |
1035 | return; | |
1036 | ||
1037 | d_events = event_trace_events_dir(); | |
1038 | if (!d_events) | |
1039 | return; | |
1040 | ||
1041 | for_each_event(call, start, end) { | |
1042 | /* The linker may leave blanks */ | |
1043 | if (!call->name) | |
1044 | continue; | |
f744bd57 JB |
1045 | if (call->raw_init) { |
1046 | ret = call->raw_init(); | |
1047 | if (ret < 0) { | |
1048 | if (ret != -ENOSYS) | |
1049 | pr_warning("Could not initialize trace " | |
1050 | "point events/%s\n", call->name); | |
1051 | continue; | |
1052 | } | |
1053 | } | |
701970b3 SR |
1054 | /* |
1055 | * This module has events, create file ops for this module | |
1056 | * if not already done. | |
1057 | */ | |
1058 | if (!file_ops) { | |
1059 | file_ops = trace_create_file_ops(mod); | |
1060 | if (!file_ops) | |
1061 | return; | |
1062 | } | |
6d723736 SR |
1063 | call->mod = mod; |
1064 | list_add(&call->list, &ftrace_events); | |
701970b3 SR |
1065 | event_create_dir(call, d_events, |
1066 | &file_ops->id, &file_ops->enable, | |
1067 | &file_ops->filter, &file_ops->format); | |
6d723736 SR |
1068 | } |
1069 | } | |
1070 | ||
1071 | static void trace_module_remove_events(struct module *mod) | |
1072 | { | |
701970b3 | 1073 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1074 | struct ftrace_event_call *call, *p; |
9456f0fa | 1075 | bool found = false; |
6d723736 | 1076 | |
110bf2b7 | 1077 | down_write(&trace_event_mutex); |
6d723736 SR |
1078 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1079 | if (call->mod == mod) { | |
9456f0fa | 1080 | found = true; |
0e907c99 | 1081 | ftrace_event_enable_disable(call, 0); |
6d723736 | 1082 | if (call->event) |
110bf2b7 | 1083 | __unregister_ftrace_event(call->event); |
6d723736 SR |
1084 | debugfs_remove_recursive(call->dir); |
1085 | list_del(&call->list); | |
2df75e41 LZ |
1086 | trace_destroy_fields(call); |
1087 | destroy_preds(call); | |
dc82ec98 | 1088 | remove_subsystem_dir(call->system); |
6d723736 SR |
1089 | } |
1090 | } | |
701970b3 SR |
1091 | |
1092 | /* Now free the file_operations */ | |
1093 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1094 | if (file_ops->mod == mod) | |
1095 | break; | |
1096 | } | |
1097 | if (&file_ops->list != &ftrace_module_file_list) { | |
1098 | list_del(&file_ops->list); | |
1099 | kfree(file_ops); | |
1100 | } | |
9456f0fa SR |
1101 | |
1102 | /* | |
1103 | * It is safest to reset the ring buffer if the module being unloaded | |
1104 | * registered any events. | |
1105 | */ | |
1106 | if (found) | |
1107 | tracing_reset_current_online_cpus(); | |
110bf2b7 | 1108 | up_write(&trace_event_mutex); |
6d723736 SR |
1109 | } |
1110 | ||
61f919a1 SR |
1111 | static int trace_module_notify(struct notifier_block *self, |
1112 | unsigned long val, void *data) | |
6d723736 SR |
1113 | { |
1114 | struct module *mod = data; | |
1115 | ||
1116 | mutex_lock(&event_mutex); | |
1117 | switch (val) { | |
1118 | case MODULE_STATE_COMING: | |
1119 | trace_module_add_events(mod); | |
1120 | break; | |
1121 | case MODULE_STATE_GOING: | |
1122 | trace_module_remove_events(mod); | |
1123 | break; | |
1124 | } | |
1125 | mutex_unlock(&event_mutex); | |
fd994989 | 1126 | |
1473e441 SR |
1127 | return 0; |
1128 | } | |
61f919a1 SR |
1129 | #else |
1130 | static int trace_module_notify(struct notifier_block *self, | |
1131 | unsigned long val, void *data) | |
1132 | { | |
1133 | return 0; | |
1134 | } | |
1135 | #endif /* CONFIG_MODULES */ | |
1473e441 | 1136 | |
ec827c7e | 1137 | static struct notifier_block trace_module_nb = { |
6d723736 SR |
1138 | .notifier_call = trace_module_notify, |
1139 | .priority = 0, | |
1140 | }; | |
1141 | ||
a59fd602 SR |
1142 | extern struct ftrace_event_call __start_ftrace_events[]; |
1143 | extern struct ftrace_event_call __stop_ftrace_events[]; | |
1144 | ||
020e5f85 LZ |
1145 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
1146 | ||
1147 | static __init int setup_trace_event(char *str) | |
1148 | { | |
1149 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
1150 | ring_buffer_expanded = 1; | |
1151 | tracing_selftest_disabled = 1; | |
1152 | ||
1153 | return 1; | |
1154 | } | |
1155 | __setup("trace_event=", setup_trace_event); | |
1156 | ||
b77e38aa SR |
1157 | static __init int event_trace_init(void) |
1158 | { | |
a59fd602 | 1159 | struct ftrace_event_call *call; |
b77e38aa SR |
1160 | struct dentry *d_tracer; |
1161 | struct dentry *entry; | |
1473e441 | 1162 | struct dentry *d_events; |
6d723736 | 1163 | int ret; |
020e5f85 LZ |
1164 | char *buf = bootup_event_buf; |
1165 | char *token; | |
b77e38aa SR |
1166 | |
1167 | d_tracer = tracing_init_dentry(); | |
1168 | if (!d_tracer) | |
1169 | return 0; | |
1170 | ||
2314c4ae SR |
1171 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
1172 | (void *)&show_event_seq_ops, | |
1173 | &ftrace_avail_fops); | |
1174 | if (!entry) | |
1175 | pr_warning("Could not create debugfs " | |
1176 | "'available_events' entry\n"); | |
1177 | ||
b77e38aa SR |
1178 | entry = debugfs_create_file("set_event", 0644, d_tracer, |
1179 | (void *)&show_set_event_seq_ops, | |
1180 | &ftrace_set_event_fops); | |
1181 | if (!entry) | |
1182 | pr_warning("Could not create debugfs " | |
1183 | "'set_event' entry\n"); | |
1184 | ||
1473e441 SR |
1185 | d_events = event_trace_events_dir(); |
1186 | if (!d_events) | |
1187 | return 0; | |
1188 | ||
d1b182a8 SR |
1189 | /* ring buffer internal formats */ |
1190 | trace_create_file("header_page", 0444, d_events, | |
1191 | ring_buffer_print_page_header, | |
1192 | &ftrace_show_header_fops); | |
1193 | ||
1194 | trace_create_file("header_event", 0444, d_events, | |
1195 | ring_buffer_print_entry_header, | |
1196 | &ftrace_show_header_fops); | |
1197 | ||
8ae79a13 | 1198 | trace_create_file("enable", 0644, d_events, |
8f31bfe5 | 1199 | NULL, &ftrace_system_enable_fops); |
8ae79a13 | 1200 | |
6d723736 | 1201 | for_each_event(call, __start_ftrace_events, __stop_ftrace_events) { |
1473e441 SR |
1202 | /* The linker may leave blanks */ |
1203 | if (!call->name) | |
1204 | continue; | |
f744bd57 JB |
1205 | if (call->raw_init) { |
1206 | ret = call->raw_init(); | |
1207 | if (ret < 0) { | |
1208 | if (ret != -ENOSYS) | |
1209 | pr_warning("Could not initialize trace " | |
1210 | "point events/%s\n", call->name); | |
1211 | continue; | |
1212 | } | |
1213 | } | |
a59fd602 | 1214 | list_add(&call->list, &ftrace_events); |
701970b3 SR |
1215 | event_create_dir(call, d_events, &ftrace_event_id_fops, |
1216 | &ftrace_enable_fops, &ftrace_event_filter_fops, | |
1217 | &ftrace_event_format_fops); | |
1473e441 SR |
1218 | } |
1219 | ||
020e5f85 LZ |
1220 | while (true) { |
1221 | token = strsep(&buf, ","); | |
1222 | ||
1223 | if (!token) | |
1224 | break; | |
1225 | if (!*token) | |
1226 | continue; | |
1227 | ||
1228 | ret = ftrace_set_clr_event(token, 1); | |
1229 | if (ret) | |
1230 | pr_warning("Failed to enable trace event: %s\n", token); | |
1231 | } | |
1232 | ||
6d723736 | 1233 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 1234 | if (ret) |
6d723736 SR |
1235 | pr_warning("Failed to register trace events module notifier\n"); |
1236 | ||
b77e38aa SR |
1237 | return 0; |
1238 | } | |
1239 | fs_initcall(event_trace_init); | |
e6187007 SR |
1240 | |
1241 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1242 | ||
1243 | static DEFINE_SPINLOCK(test_spinlock); | |
1244 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
1245 | static DEFINE_MUTEX(test_mutex); | |
1246 | ||
1247 | static __init void test_work(struct work_struct *dummy) | |
1248 | { | |
1249 | spin_lock(&test_spinlock); | |
1250 | spin_lock_irq(&test_spinlock_irq); | |
1251 | udelay(1); | |
1252 | spin_unlock_irq(&test_spinlock_irq); | |
1253 | spin_unlock(&test_spinlock); | |
1254 | ||
1255 | mutex_lock(&test_mutex); | |
1256 | msleep(1); | |
1257 | mutex_unlock(&test_mutex); | |
1258 | } | |
1259 | ||
1260 | static __init int event_test_thread(void *unused) | |
1261 | { | |
1262 | void *test_malloc; | |
1263 | ||
1264 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
1265 | if (!test_malloc) | |
1266 | pr_info("failed to kmalloc\n"); | |
1267 | ||
1268 | schedule_on_each_cpu(test_work); | |
1269 | ||
1270 | kfree(test_malloc); | |
1271 | ||
1272 | set_current_state(TASK_INTERRUPTIBLE); | |
1273 | while (!kthread_should_stop()) | |
1274 | schedule(); | |
1275 | ||
1276 | return 0; | |
1277 | } | |
1278 | ||
1279 | /* | |
1280 | * Do various things that may trigger events. | |
1281 | */ | |
1282 | static __init void event_test_stuff(void) | |
1283 | { | |
1284 | struct task_struct *test_thread; | |
1285 | ||
1286 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
1287 | msleep(1); | |
1288 | kthread_stop(test_thread); | |
1289 | } | |
1290 | ||
1291 | /* | |
1292 | * For every trace event defined, we will test each trace point separately, | |
1293 | * and then by groups, and finally all trace points. | |
1294 | */ | |
9ea21c1e | 1295 | static __init void event_trace_self_tests(void) |
e6187007 SR |
1296 | { |
1297 | struct ftrace_event_call *call; | |
1298 | struct event_subsystem *system; | |
e6187007 SR |
1299 | int ret; |
1300 | ||
1301 | pr_info("Running tests on trace events:\n"); | |
1302 | ||
1303 | list_for_each_entry(call, &ftrace_events, list) { | |
1304 | ||
1305 | /* Only test those that have a regfunc */ | |
1306 | if (!call->regfunc) | |
1307 | continue; | |
1308 | ||
1f5a6b45 SR |
1309 | /* |
1310 | * Testing syscall events here is pretty useless, but | |
1311 | * we still do it if configured. But this is time consuming. | |
1312 | * What we really need is a user thread to perform the | |
1313 | * syscalls as we test. | |
1314 | */ | |
1315 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
1316 | if (call->system && | |
1317 | strcmp(call->system, "syscalls") == 0) | |
1318 | continue; | |
1319 | #endif | |
1320 | ||
e6187007 SR |
1321 | pr_info("Testing event %s: ", call->name); |
1322 | ||
1323 | /* | |
1324 | * If an event is already enabled, someone is using | |
1325 | * it and the self test should not be on. | |
1326 | */ | |
1327 | if (call->enabled) { | |
1328 | pr_warning("Enabled event during self test!\n"); | |
1329 | WARN_ON_ONCE(1); | |
1330 | continue; | |
1331 | } | |
1332 | ||
0e907c99 | 1333 | ftrace_event_enable_disable(call, 1); |
e6187007 | 1334 | event_test_stuff(); |
0e907c99 | 1335 | ftrace_event_enable_disable(call, 0); |
e6187007 SR |
1336 | |
1337 | pr_cont("OK\n"); | |
1338 | } | |
1339 | ||
1340 | /* Now test at the sub system level */ | |
1341 | ||
1342 | pr_info("Running tests on trace event systems:\n"); | |
1343 | ||
1344 | list_for_each_entry(system, &event_subsystems, list) { | |
1345 | ||
1346 | /* the ftrace system is special, skip it */ | |
1347 | if (strcmp(system->name, "ftrace") == 0) | |
1348 | continue; | |
1349 | ||
1350 | pr_info("Testing event system %s: ", system->name); | |
1351 | ||
8f31bfe5 | 1352 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1); |
e6187007 SR |
1353 | if (WARN_ON_ONCE(ret)) { |
1354 | pr_warning("error enabling system %s\n", | |
1355 | system->name); | |
1356 | continue; | |
1357 | } | |
1358 | ||
1359 | event_test_stuff(); | |
1360 | ||
8f31bfe5 | 1361 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0); |
e6187007 SR |
1362 | if (WARN_ON_ONCE(ret)) |
1363 | pr_warning("error disabling system %s\n", | |
1364 | system->name); | |
1365 | ||
1366 | pr_cont("OK\n"); | |
1367 | } | |
1368 | ||
1369 | /* Test with all events enabled */ | |
1370 | ||
1371 | pr_info("Running tests on all trace events:\n"); | |
1372 | pr_info("Testing all events: "); | |
1373 | ||
8f31bfe5 | 1374 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1); |
e6187007 | 1375 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 1376 | pr_warning("error enabling all events\n"); |
9ea21c1e | 1377 | return; |
e6187007 SR |
1378 | } |
1379 | ||
1380 | event_test_stuff(); | |
1381 | ||
1382 | /* reset sysname */ | |
8f31bfe5 | 1383 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0); |
e6187007 SR |
1384 | if (WARN_ON_ONCE(ret)) { |
1385 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 1386 | return; |
e6187007 SR |
1387 | } |
1388 | ||
1389 | pr_cont("OK\n"); | |
9ea21c1e SR |
1390 | } |
1391 | ||
1392 | #ifdef CONFIG_FUNCTION_TRACER | |
1393 | ||
245b2e70 | 1394 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e SR |
1395 | |
1396 | static void | |
1397 | function_test_events_call(unsigned long ip, unsigned long parent_ip) | |
1398 | { | |
1399 | struct ring_buffer_event *event; | |
e77405ad | 1400 | struct ring_buffer *buffer; |
9ea21c1e SR |
1401 | struct ftrace_entry *entry; |
1402 | unsigned long flags; | |
1403 | long disabled; | |
1404 | int resched; | |
1405 | int cpu; | |
1406 | int pc; | |
1407 | ||
1408 | pc = preempt_count(); | |
1409 | resched = ftrace_preempt_disable(); | |
1410 | cpu = raw_smp_processor_id(); | |
245b2e70 | 1411 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
1412 | |
1413 | if (disabled != 1) | |
1414 | goto out; | |
1415 | ||
1416 | local_save_flags(flags); | |
1417 | ||
e77405ad SR |
1418 | event = trace_current_buffer_lock_reserve(&buffer, |
1419 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
1420 | flags, pc); |
1421 | if (!event) | |
1422 | goto out; | |
1423 | entry = ring_buffer_event_data(event); | |
1424 | entry->ip = ip; | |
1425 | entry->parent_ip = parent_ip; | |
1426 | ||
e77405ad | 1427 | trace_nowake_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
1428 | |
1429 | out: | |
245b2e70 | 1430 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
1431 | ftrace_preempt_enable(resched); |
1432 | } | |
1433 | ||
1434 | static struct ftrace_ops trace_ops __initdata = | |
1435 | { | |
1436 | .func = function_test_events_call, | |
1437 | }; | |
1438 | ||
1439 | static __init void event_trace_self_test_with_function(void) | |
1440 | { | |
1441 | register_ftrace_function(&trace_ops); | |
1442 | pr_info("Running tests again, along with the function tracer\n"); | |
1443 | event_trace_self_tests(); | |
1444 | unregister_ftrace_function(&trace_ops); | |
1445 | } | |
1446 | #else | |
1447 | static __init void event_trace_self_test_with_function(void) | |
1448 | { | |
1449 | } | |
1450 | #endif | |
1451 | ||
1452 | static __init int event_trace_self_tests_init(void) | |
1453 | { | |
020e5f85 LZ |
1454 | if (!tracing_selftest_disabled) { |
1455 | event_trace_self_tests(); | |
1456 | event_trace_self_test_with_function(); | |
1457 | } | |
e6187007 SR |
1458 | |
1459 | return 0; | |
1460 | } | |
1461 | ||
28d20e2d | 1462 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
1463 | |
1464 | #endif |