Commit | Line | Data |
---|---|---|
b77e38aa SR |
1 | /* |
2 | * event tracer | |
3 | * | |
4 | * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> | |
5 | * | |
981d081e SR |
6 | * - Added format output of fields of the trace point. |
7 | * This was based off of work by Tom Zanussi <tzanussi@gmail.com>. | |
8 | * | |
b77e38aa SR |
9 | */ |
10 | ||
e6187007 SR |
11 | #include <linux/workqueue.h> |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/kthread.h> | |
b77e38aa SR |
14 | #include <linux/debugfs.h> |
15 | #include <linux/uaccess.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/ctype.h> | |
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 | ||
aeaeae11 FW |
31 | int trace_define_field(struct ftrace_event_call *call, const char *type, |
32 | const char *name, int offset, int size, int is_signed, | |
43b51ead | 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 | |
bd1a5c84 | 96 | void trace_destroy_fields(struct ftrace_event_call *call) |
2df75e41 LZ |
97 | { |
98 | struct ftrace_event_field *field, *next; | |
99 | ||
100 | list_for_each_entry_safe(field, next, &call->fields, link) { | |
101 | list_del(&field->link); | |
102 | kfree(field->type); | |
103 | kfree(field->name); | |
104 | kfree(field); | |
105 | } | |
106 | } | |
107 | ||
87d9b4e1 LZ |
108 | int trace_event_raw_init(struct ftrace_event_call *call) |
109 | { | |
110 | int id; | |
111 | ||
112 | id = register_ftrace_event(call->event); | |
113 | if (!id) | |
114 | return -ENODEV; | |
115 | call->id = id; | |
116 | INIT_LIST_HEAD(&call->fields); | |
117 | ||
118 | return 0; | |
119 | } | |
120 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
121 | ||
fd994989 SR |
122 | static void ftrace_event_enable_disable(struct ftrace_event_call *call, |
123 | int enable) | |
124 | { | |
fd994989 SR |
125 | switch (enable) { |
126 | case 0: | |
127 | if (call->enabled) { | |
128 | call->enabled = 0; | |
b11c53e1 | 129 | tracing_stop_cmdline_record(); |
bd1a5c84 | 130 | call->unregfunc(call); |
fd994989 | 131 | } |
fd994989 SR |
132 | break; |
133 | case 1: | |
da4d0302 | 134 | if (!call->enabled) { |
fd994989 | 135 | call->enabled = 1; |
b11c53e1 | 136 | tracing_start_cmdline_record(); |
bd1a5c84 | 137 | call->regfunc(call); |
fd994989 | 138 | } |
fd994989 SR |
139 | break; |
140 | } | |
141 | } | |
142 | ||
0e907c99 Z |
143 | static void ftrace_clear_events(void) |
144 | { | |
145 | struct ftrace_event_call *call; | |
146 | ||
147 | mutex_lock(&event_mutex); | |
148 | list_for_each_entry(call, &ftrace_events, list) { | |
149 | ftrace_event_enable_disable(call, 0); | |
150 | } | |
151 | mutex_unlock(&event_mutex); | |
152 | } | |
153 | ||
8f31bfe5 LZ |
154 | /* |
155 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
156 | */ | |
157 | static int __ftrace_set_clr_event(const char *match, const char *sub, | |
158 | const char *event, int set) | |
b77e38aa | 159 | { |
a59fd602 | 160 | struct ftrace_event_call *call; |
29f93943 | 161 | int ret = -EINVAL; |
8f31bfe5 LZ |
162 | |
163 | mutex_lock(&event_mutex); | |
164 | list_for_each_entry(call, &ftrace_events, list) { | |
165 | ||
166 | if (!call->name || !call->regfunc) | |
167 | continue; | |
168 | ||
169 | if (match && | |
170 | strcmp(match, call->name) != 0 && | |
171 | strcmp(match, call->system) != 0) | |
172 | continue; | |
173 | ||
174 | if (sub && strcmp(sub, call->system) != 0) | |
175 | continue; | |
176 | ||
177 | if (event && strcmp(event, call->name) != 0) | |
178 | continue; | |
179 | ||
180 | ftrace_event_enable_disable(call, set); | |
181 | ||
182 | ret = 0; | |
183 | } | |
184 | mutex_unlock(&event_mutex); | |
185 | ||
186 | return ret; | |
187 | } | |
188 | ||
189 | static int ftrace_set_clr_event(char *buf, int set) | |
190 | { | |
b628b3e6 | 191 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
192 | |
193 | /* | |
194 | * The buf format can be <subsystem>:<event-name> | |
195 | * *:<event-name> means any event by that name. | |
196 | * :<event-name> is the same. | |
197 | * | |
198 | * <subsystem>:* means all events in that subsystem | |
199 | * <subsystem>: means the same. | |
200 | * | |
201 | * <name> (no ':') means all events in a subsystem with | |
202 | * the name <name> or any event that matches <name> | |
203 | */ | |
204 | ||
205 | match = strsep(&buf, ":"); | |
206 | if (buf) { | |
207 | sub = match; | |
208 | event = buf; | |
209 | match = NULL; | |
210 | ||
211 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
212 | sub = NULL; | |
213 | if (!strlen(event) || strcmp(event, "*") == 0) | |
214 | event = NULL; | |
215 | } | |
b77e38aa | 216 | |
8f31bfe5 | 217 | return __ftrace_set_clr_event(match, sub, event, set); |
b77e38aa SR |
218 | } |
219 | ||
4671c794 SR |
220 | /** |
221 | * trace_set_clr_event - enable or disable an event | |
222 | * @system: system name to match (NULL for any system) | |
223 | * @event: event name to match (NULL for all events, within system) | |
224 | * @set: 1 to enable, 0 to disable | |
225 | * | |
226 | * This is a way for other parts of the kernel to enable or disable | |
227 | * event recording. | |
228 | * | |
229 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
230 | * registered events. | |
231 | */ | |
232 | int trace_set_clr_event(const char *system, const char *event, int set) | |
233 | { | |
234 | return __ftrace_set_clr_event(NULL, system, event, set); | |
235 | } | |
236 | ||
b77e38aa SR |
237 | /* 128 should be much more than enough */ |
238 | #define EVENT_BUF_SIZE 127 | |
239 | ||
240 | static ssize_t | |
241 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
242 | size_t cnt, loff_t *ppos) | |
243 | { | |
48966364 | 244 | struct trace_parser parser; |
4ba7978e | 245 | ssize_t read, ret; |
b77e38aa | 246 | |
4ba7978e | 247 | if (!cnt) |
b77e38aa SR |
248 | return 0; |
249 | ||
1852fcce SR |
250 | ret = tracing_update_buffers(); |
251 | if (ret < 0) | |
252 | return ret; | |
253 | ||
48966364 | 254 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
255 | return -ENOMEM; |
256 | ||
48966364 | 257 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
258 | ||
4ba7978e | 259 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 260 | int set = 1; |
b77e38aa | 261 | |
48966364 | 262 | if (*parser.buffer == '!') |
b77e38aa | 263 | set = 0; |
b77e38aa | 264 | |
48966364 | 265 | parser.buffer[parser.idx] = 0; |
266 | ||
267 | ret = ftrace_set_clr_event(parser.buffer + !set, set); | |
b77e38aa | 268 | if (ret) |
48966364 | 269 | goto out_put; |
b77e38aa | 270 | } |
b77e38aa SR |
271 | |
272 | ret = read; | |
273 | ||
48966364 | 274 | out_put: |
275 | trace_parser_put(&parser); | |
b77e38aa SR |
276 | |
277 | return ret; | |
278 | } | |
279 | ||
280 | static void * | |
281 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
282 | { | |
30bd39cd | 283 | struct ftrace_event_call *call = v; |
b77e38aa SR |
284 | |
285 | (*pos)++; | |
286 | ||
30bd39cd | 287 | list_for_each_entry_continue(call, &ftrace_events, list) { |
40e26815 SR |
288 | /* |
289 | * The ftrace subsystem is for showing formats only. | |
290 | * They can not be enabled or disabled via the event files. | |
291 | */ | |
292 | if (call->regfunc) | |
30bd39cd | 293 | return call; |
40e26815 | 294 | } |
b77e38aa | 295 | |
30bd39cd | 296 | return NULL; |
b77e38aa SR |
297 | } |
298 | ||
299 | static void *t_start(struct seq_file *m, loff_t *pos) | |
300 | { | |
30bd39cd | 301 | struct ftrace_event_call *call; |
e1c7e2a6 LZ |
302 | loff_t l; |
303 | ||
20c8928a | 304 | mutex_lock(&event_mutex); |
e1c7e2a6 | 305 | |
30bd39cd | 306 | call = list_entry(&ftrace_events, struct ftrace_event_call, list); |
e1c7e2a6 | 307 | for (l = 0; l <= *pos; ) { |
30bd39cd | 308 | call = t_next(m, call, &l); |
e1c7e2a6 LZ |
309 | if (!call) |
310 | break; | |
311 | } | |
312 | return call; | |
b77e38aa SR |
313 | } |
314 | ||
315 | static void * | |
316 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
317 | { | |
30bd39cd | 318 | struct ftrace_event_call *call = v; |
b77e38aa SR |
319 | |
320 | (*pos)++; | |
321 | ||
30bd39cd LZ |
322 | list_for_each_entry_continue(call, &ftrace_events, list) { |
323 | if (call->enabled) | |
324 | return call; | |
b77e38aa SR |
325 | } |
326 | ||
30bd39cd | 327 | return NULL; |
b77e38aa SR |
328 | } |
329 | ||
330 | static void *s_start(struct seq_file *m, loff_t *pos) | |
331 | { | |
30bd39cd | 332 | struct ftrace_event_call *call; |
e1c7e2a6 LZ |
333 | loff_t l; |
334 | ||
20c8928a | 335 | mutex_lock(&event_mutex); |
e1c7e2a6 | 336 | |
30bd39cd | 337 | call = list_entry(&ftrace_events, struct ftrace_event_call, list); |
e1c7e2a6 | 338 | for (l = 0; l <= *pos; ) { |
30bd39cd | 339 | call = s_next(m, call, &l); |
e1c7e2a6 LZ |
340 | if (!call) |
341 | break; | |
342 | } | |
343 | return call; | |
b77e38aa SR |
344 | } |
345 | ||
346 | static int t_show(struct seq_file *m, void *v) | |
347 | { | |
348 | struct ftrace_event_call *call = v; | |
349 | ||
b628b3e6 SR |
350 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
351 | seq_printf(m, "%s:", call->system); | |
b77e38aa SR |
352 | seq_printf(m, "%s\n", call->name); |
353 | ||
354 | return 0; | |
355 | } | |
356 | ||
357 | static void t_stop(struct seq_file *m, void *p) | |
358 | { | |
20c8928a | 359 | mutex_unlock(&event_mutex); |
b77e38aa SR |
360 | } |
361 | ||
362 | static int | |
363 | ftrace_event_seq_open(struct inode *inode, struct file *file) | |
364 | { | |
b77e38aa SR |
365 | const struct seq_operations *seq_ops; |
366 | ||
367 | if ((file->f_mode & FMODE_WRITE) && | |
8650ae32 | 368 | (file->f_flags & O_TRUNC)) |
b77e38aa SR |
369 | ftrace_clear_events(); |
370 | ||
371 | seq_ops = inode->i_private; | |
20c8928a | 372 | return seq_open(file, seq_ops); |
b77e38aa SR |
373 | } |
374 | ||
1473e441 SR |
375 | static ssize_t |
376 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
377 | loff_t *ppos) | |
378 | { | |
379 | struct ftrace_event_call *call = filp->private_data; | |
380 | char *buf; | |
381 | ||
da4d0302 | 382 | if (call->enabled) |
1473e441 SR |
383 | buf = "1\n"; |
384 | else | |
385 | buf = "0\n"; | |
386 | ||
387 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
388 | } | |
389 | ||
390 | static ssize_t | |
391 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
392 | loff_t *ppos) | |
393 | { | |
394 | struct ftrace_event_call *call = filp->private_data; | |
395 | char buf[64]; | |
396 | unsigned long val; | |
397 | int ret; | |
398 | ||
399 | if (cnt >= sizeof(buf)) | |
400 | return -EINVAL; | |
401 | ||
402 | if (copy_from_user(&buf, ubuf, cnt)) | |
403 | return -EFAULT; | |
404 | ||
405 | buf[cnt] = 0; | |
406 | ||
407 | ret = strict_strtoul(buf, 10, &val); | |
408 | if (ret < 0) | |
409 | return ret; | |
410 | ||
1852fcce SR |
411 | ret = tracing_update_buffers(); |
412 | if (ret < 0) | |
413 | return ret; | |
414 | ||
1473e441 SR |
415 | switch (val) { |
416 | case 0: | |
1473e441 | 417 | case 1: |
11a241a3 | 418 | mutex_lock(&event_mutex); |
fd994989 | 419 | ftrace_event_enable_disable(call, val); |
11a241a3 | 420 | mutex_unlock(&event_mutex); |
1473e441 SR |
421 | break; |
422 | ||
423 | default: | |
424 | return -EINVAL; | |
425 | } | |
426 | ||
427 | *ppos += cnt; | |
428 | ||
429 | return cnt; | |
430 | } | |
431 | ||
8ae79a13 SR |
432 | static ssize_t |
433 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
434 | loff_t *ppos) | |
435 | { | |
c142b15d | 436 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
8ae79a13 SR |
437 | const char *system = filp->private_data; |
438 | struct ftrace_event_call *call; | |
439 | char buf[2]; | |
c142b15d | 440 | int set = 0; |
8ae79a13 SR |
441 | int ret; |
442 | ||
8ae79a13 SR |
443 | mutex_lock(&event_mutex); |
444 | list_for_each_entry(call, &ftrace_events, list) { | |
445 | if (!call->name || !call->regfunc) | |
446 | continue; | |
447 | ||
8f31bfe5 | 448 | if (system && strcmp(call->system, system) != 0) |
8ae79a13 SR |
449 | continue; |
450 | ||
451 | /* | |
452 | * We need to find out if all the events are set | |
453 | * or if all events or cleared, or if we have | |
454 | * a mixture. | |
455 | */ | |
c142b15d LZ |
456 | set |= (1 << !!call->enabled); |
457 | ||
8ae79a13 SR |
458 | /* |
459 | * If we have a mixture, no need to look further. | |
460 | */ | |
c142b15d | 461 | if (set == 3) |
8ae79a13 SR |
462 | break; |
463 | } | |
464 | mutex_unlock(&event_mutex); | |
465 | ||
c142b15d | 466 | buf[0] = set_to_char[set]; |
8ae79a13 | 467 | buf[1] = '\n'; |
8ae79a13 SR |
468 | |
469 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
470 | ||
471 | return ret; | |
472 | } | |
473 | ||
474 | static ssize_t | |
475 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
476 | loff_t *ppos) | |
477 | { | |
478 | const char *system = filp->private_data; | |
479 | unsigned long val; | |
8ae79a13 SR |
480 | char buf[64]; |
481 | ssize_t ret; | |
482 | ||
483 | if (cnt >= sizeof(buf)) | |
484 | return -EINVAL; | |
485 | ||
486 | if (copy_from_user(&buf, ubuf, cnt)) | |
487 | return -EFAULT; | |
488 | ||
489 | buf[cnt] = 0; | |
490 | ||
491 | ret = strict_strtoul(buf, 10, &val); | |
492 | if (ret < 0) | |
493 | return ret; | |
494 | ||
495 | ret = tracing_update_buffers(); | |
496 | if (ret < 0) | |
497 | return ret; | |
498 | ||
8f31bfe5 | 499 | if (val != 0 && val != 1) |
8ae79a13 | 500 | return -EINVAL; |
8ae79a13 | 501 | |
8f31bfe5 | 502 | ret = __ftrace_set_clr_event(NULL, system, NULL, val); |
8ae79a13 | 503 | if (ret) |
8f31bfe5 | 504 | goto out; |
8ae79a13 SR |
505 | |
506 | ret = cnt; | |
507 | ||
8f31bfe5 | 508 | out: |
8ae79a13 SR |
509 | *ppos += cnt; |
510 | ||
511 | return ret; | |
512 | } | |
513 | ||
75db37d2 SR |
514 | extern char *__bad_type_size(void); |
515 | ||
91729ef9 | 516 | #undef FIELD |
156b5f17 | 517 | #define FIELD(type, name) \ |
75db37d2 | 518 | sizeof(type) != sizeof(field.name) ? __bad_type_size() : \ |
cf027f64 | 519 | #type, "common_" #name, offsetof(typeof(field), name), \ |
26a50744 | 520 | sizeof(field.name), is_signed_type(type) |
91729ef9 SR |
521 | |
522 | static int trace_write_header(struct trace_seq *s) | |
523 | { | |
524 | struct trace_entry field; | |
525 | ||
526 | /* struct trace_entry */ | |
527 | return trace_seq_printf(s, | |
26a50744 TZ |
528 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\tsigned:%u;\n" |
529 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\tsigned:%u;\n" | |
530 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\tsigned:%u;\n" | |
531 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\tsigned:%u;\n" | |
532 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\tsigned:%u;\n" | |
533 | "\n", | |
534 | FIELD(unsigned short, type), | |
535 | FIELD(unsigned char, flags), | |
536 | FIELD(unsigned char, preempt_count), | |
537 | FIELD(int, pid), | |
538 | FIELD(int, lock_depth)); | |
91729ef9 | 539 | } |
da4d0302 | 540 | |
981d081e SR |
541 | static ssize_t |
542 | event_format_read(struct file *filp, char __user *ubuf, size_t cnt, | |
543 | loff_t *ppos) | |
544 | { | |
545 | struct ftrace_event_call *call = filp->private_data; | |
546 | struct trace_seq *s; | |
547 | char *buf; | |
548 | int r; | |
549 | ||
c269fc8c TZ |
550 | if (*ppos) |
551 | return 0; | |
552 | ||
981d081e SR |
553 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
554 | if (!s) | |
555 | return -ENOMEM; | |
556 | ||
557 | trace_seq_init(s); | |
558 | ||
c5e4e192 SR |
559 | /* If any of the first writes fail, so will the show_format. */ |
560 | ||
561 | trace_seq_printf(s, "name: %s\n", call->name); | |
562 | trace_seq_printf(s, "ID: %d\n", call->id); | |
563 | trace_seq_printf(s, "format:\n"); | |
91729ef9 SR |
564 | trace_write_header(s); |
565 | ||
e8f9f4d7 | 566 | r = call->show_format(call, s); |
981d081e SR |
567 | if (!r) { |
568 | /* | |
569 | * ug! The format output is bigger than a PAGE!! | |
570 | */ | |
571 | buf = "FORMAT TOO BIG\n"; | |
572 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
573 | buf, strlen(buf)); | |
574 | goto out; | |
575 | } | |
576 | ||
577 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
578 | s->buffer, s->len); | |
579 | out: | |
580 | kfree(s); | |
581 | return r; | |
582 | } | |
583 | ||
23725aee PZ |
584 | static ssize_t |
585 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
586 | { | |
587 | struct ftrace_event_call *call = filp->private_data; | |
588 | struct trace_seq *s; | |
589 | int r; | |
590 | ||
591 | if (*ppos) | |
592 | return 0; | |
593 | ||
594 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
595 | if (!s) | |
596 | return -ENOMEM; | |
597 | ||
598 | trace_seq_init(s); | |
599 | trace_seq_printf(s, "%d\n", call->id); | |
600 | ||
601 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
602 | s->buffer, s->len); | |
603 | kfree(s); | |
604 | return r; | |
605 | } | |
606 | ||
7ce7e424 TZ |
607 | static ssize_t |
608 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
609 | loff_t *ppos) | |
610 | { | |
611 | struct ftrace_event_call *call = filp->private_data; | |
612 | struct trace_seq *s; | |
613 | int r; | |
614 | ||
615 | if (*ppos) | |
616 | return 0; | |
617 | ||
618 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
619 | if (!s) | |
620 | return -ENOMEM; | |
621 | ||
622 | trace_seq_init(s); | |
623 | ||
8b372562 | 624 | print_event_filter(call, s); |
4bda2d51 | 625 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
626 | |
627 | kfree(s); | |
628 | ||
629 | return r; | |
630 | } | |
631 | ||
632 | static ssize_t | |
633 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
634 | loff_t *ppos) | |
635 | { | |
636 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 637 | char *buf; |
7ce7e424 TZ |
638 | int err; |
639 | ||
8b372562 | 640 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
641 | return -EINVAL; |
642 | ||
8b372562 TZ |
643 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
644 | if (!buf) | |
7ce7e424 TZ |
645 | return -ENOMEM; |
646 | ||
8b372562 TZ |
647 | if (copy_from_user(buf, ubuf, cnt)) { |
648 | free_page((unsigned long) buf); | |
649 | return -EFAULT; | |
7ce7e424 | 650 | } |
8b372562 | 651 | buf[cnt] = '\0'; |
7ce7e424 | 652 | |
8b372562 TZ |
653 | err = apply_event_filter(call, buf); |
654 | free_page((unsigned long) buf); | |
655 | if (err < 0) | |
44e9c8b7 | 656 | return err; |
0a19e53c | 657 | |
7ce7e424 TZ |
658 | *ppos += cnt; |
659 | ||
660 | return cnt; | |
661 | } | |
662 | ||
cfb180f3 TZ |
663 | static ssize_t |
664 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
665 | loff_t *ppos) | |
666 | { | |
667 | struct event_subsystem *system = filp->private_data; | |
668 | struct trace_seq *s; | |
669 | int r; | |
670 | ||
671 | if (*ppos) | |
672 | return 0; | |
673 | ||
674 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
675 | if (!s) | |
676 | return -ENOMEM; | |
677 | ||
678 | trace_seq_init(s); | |
679 | ||
8b372562 | 680 | print_subsystem_event_filter(system, s); |
4bda2d51 | 681 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
682 | |
683 | kfree(s); | |
684 | ||
685 | return r; | |
686 | } | |
687 | ||
688 | static ssize_t | |
689 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
690 | loff_t *ppos) | |
691 | { | |
692 | struct event_subsystem *system = filp->private_data; | |
8b372562 | 693 | char *buf; |
cfb180f3 TZ |
694 | int err; |
695 | ||
8b372562 | 696 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
697 | return -EINVAL; |
698 | ||
8b372562 TZ |
699 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
700 | if (!buf) | |
cfb180f3 TZ |
701 | return -ENOMEM; |
702 | ||
8b372562 TZ |
703 | if (copy_from_user(buf, ubuf, cnt)) { |
704 | free_page((unsigned long) buf); | |
705 | return -EFAULT; | |
cfb180f3 | 706 | } |
8b372562 | 707 | buf[cnt] = '\0'; |
cfb180f3 | 708 | |
8b372562 TZ |
709 | err = apply_subsystem_event_filter(system, buf); |
710 | free_page((unsigned long) buf); | |
711 | if (err < 0) | |
44e9c8b7 | 712 | return err; |
cfb180f3 TZ |
713 | |
714 | *ppos += cnt; | |
715 | ||
716 | return cnt; | |
717 | } | |
718 | ||
d1b182a8 SR |
719 | static ssize_t |
720 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
721 | { | |
722 | int (*func)(struct trace_seq *s) = filp->private_data; | |
723 | struct trace_seq *s; | |
724 | int r; | |
725 | ||
726 | if (*ppos) | |
727 | return 0; | |
728 | ||
729 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
730 | if (!s) | |
731 | return -ENOMEM; | |
732 | ||
733 | trace_seq_init(s); | |
734 | ||
735 | func(s); | |
736 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
737 | ||
738 | kfree(s); | |
739 | ||
740 | return r; | |
741 | } | |
742 | ||
b77e38aa SR |
743 | static const struct seq_operations show_event_seq_ops = { |
744 | .start = t_start, | |
745 | .next = t_next, | |
746 | .show = t_show, | |
747 | .stop = t_stop, | |
748 | }; | |
749 | ||
750 | static const struct seq_operations show_set_event_seq_ops = { | |
751 | .start = s_start, | |
752 | .next = s_next, | |
753 | .show = t_show, | |
754 | .stop = t_stop, | |
755 | }; | |
756 | ||
2314c4ae SR |
757 | static const struct file_operations ftrace_avail_fops = { |
758 | .open = ftrace_event_seq_open, | |
759 | .read = seq_read, | |
760 | .llseek = seq_lseek, | |
761 | .release = seq_release, | |
762 | }; | |
763 | ||
b77e38aa SR |
764 | static const struct file_operations ftrace_set_event_fops = { |
765 | .open = ftrace_event_seq_open, | |
766 | .read = seq_read, | |
767 | .write = ftrace_event_write, | |
768 | .llseek = seq_lseek, | |
769 | .release = seq_release, | |
770 | }; | |
771 | ||
1473e441 SR |
772 | static const struct file_operations ftrace_enable_fops = { |
773 | .open = tracing_open_generic, | |
774 | .read = event_enable_read, | |
775 | .write = event_enable_write, | |
776 | }; | |
777 | ||
981d081e SR |
778 | static const struct file_operations ftrace_event_format_fops = { |
779 | .open = tracing_open_generic, | |
780 | .read = event_format_read, | |
781 | }; | |
782 | ||
23725aee PZ |
783 | static const struct file_operations ftrace_event_id_fops = { |
784 | .open = tracing_open_generic, | |
785 | .read = event_id_read, | |
786 | }; | |
787 | ||
7ce7e424 TZ |
788 | static const struct file_operations ftrace_event_filter_fops = { |
789 | .open = tracing_open_generic, | |
790 | .read = event_filter_read, | |
791 | .write = event_filter_write, | |
792 | }; | |
793 | ||
cfb180f3 TZ |
794 | static const struct file_operations ftrace_subsystem_filter_fops = { |
795 | .open = tracing_open_generic, | |
796 | .read = subsystem_filter_read, | |
797 | .write = subsystem_filter_write, | |
798 | }; | |
799 | ||
8ae79a13 SR |
800 | static const struct file_operations ftrace_system_enable_fops = { |
801 | .open = tracing_open_generic, | |
802 | .read = system_enable_read, | |
803 | .write = system_enable_write, | |
804 | }; | |
805 | ||
d1b182a8 SR |
806 | static const struct file_operations ftrace_show_header_fops = { |
807 | .open = tracing_open_generic, | |
808 | .read = show_header, | |
809 | }; | |
810 | ||
1473e441 SR |
811 | static struct dentry *event_trace_events_dir(void) |
812 | { | |
813 | static struct dentry *d_tracer; | |
814 | static struct dentry *d_events; | |
815 | ||
816 | if (d_events) | |
817 | return d_events; | |
818 | ||
819 | d_tracer = tracing_init_dentry(); | |
820 | if (!d_tracer) | |
821 | return NULL; | |
822 | ||
823 | d_events = debugfs_create_dir("events", d_tracer); | |
824 | if (!d_events) | |
825 | pr_warning("Could not create debugfs " | |
826 | "'events' directory\n"); | |
827 | ||
828 | return d_events; | |
829 | } | |
830 | ||
6ecc2d1c SR |
831 | static LIST_HEAD(event_subsystems); |
832 | ||
833 | static struct dentry * | |
834 | event_subsystem_dir(const char *name, struct dentry *d_events) | |
835 | { | |
836 | struct event_subsystem *system; | |
e1112b4d | 837 | struct dentry *entry; |
6ecc2d1c SR |
838 | |
839 | /* First see if we did not already create this dir */ | |
840 | list_for_each_entry(system, &event_subsystems, list) { | |
dc82ec98 XG |
841 | if (strcmp(system->name, name) == 0) { |
842 | system->nr_events++; | |
6ecc2d1c | 843 | return system->entry; |
dc82ec98 | 844 | } |
6ecc2d1c SR |
845 | } |
846 | ||
847 | /* need to create new entry */ | |
848 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
849 | if (!system) { | |
850 | pr_warning("No memory to create event subsystem %s\n", | |
851 | name); | |
852 | return d_events; | |
853 | } | |
854 | ||
855 | system->entry = debugfs_create_dir(name, d_events); | |
856 | if (!system->entry) { | |
857 | pr_warning("Could not create event subsystem %s\n", | |
858 | name); | |
859 | kfree(system); | |
860 | return d_events; | |
861 | } | |
862 | ||
dc82ec98 | 863 | system->nr_events = 1; |
6d723736 SR |
864 | system->name = kstrdup(name, GFP_KERNEL); |
865 | if (!system->name) { | |
866 | debugfs_remove(system->entry); | |
867 | kfree(system); | |
868 | return d_events; | |
869 | } | |
870 | ||
6ecc2d1c SR |
871 | list_add(&system->list, &event_subsystems); |
872 | ||
30e673b2 | 873 | system->filter = NULL; |
cfb180f3 | 874 | |
8b372562 TZ |
875 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
876 | if (!system->filter) { | |
877 | pr_warning("Could not allocate filter for subsystem " | |
878 | "'%s'\n", name); | |
879 | return system->entry; | |
880 | } | |
881 | ||
e1112b4d TZ |
882 | entry = debugfs_create_file("filter", 0644, system->entry, system, |
883 | &ftrace_subsystem_filter_fops); | |
8b372562 TZ |
884 | if (!entry) { |
885 | kfree(system->filter); | |
886 | system->filter = NULL; | |
e1112b4d TZ |
887 | pr_warning("Could not create debugfs " |
888 | "'%s/filter' entry\n", name); | |
8b372562 | 889 | } |
e1112b4d | 890 | |
f3f3f009 FW |
891 | trace_create_file("enable", 0644, system->entry, |
892 | (void *)system->name, | |
893 | &ftrace_system_enable_fops); | |
8ae79a13 | 894 | |
6ecc2d1c SR |
895 | return system->entry; |
896 | } | |
897 | ||
1473e441 | 898 | static int |
701970b3 SR |
899 | event_create_dir(struct ftrace_event_call *call, struct dentry *d_events, |
900 | const struct file_operations *id, | |
901 | const struct file_operations *enable, | |
902 | const struct file_operations *filter, | |
903 | const struct file_operations *format) | |
1473e441 | 904 | { |
fd994989 | 905 | int ret; |
1473e441 | 906 | |
6ecc2d1c SR |
907 | /* |
908 | * If the trace point header did not define TRACE_SYSTEM | |
909 | * then the system would be called "TRACE_SYSTEM". | |
910 | */ | |
6d723736 | 911 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
6ecc2d1c SR |
912 | d_events = event_subsystem_dir(call->system, d_events); |
913 | ||
1473e441 SR |
914 | call->dir = debugfs_create_dir(call->name, d_events); |
915 | if (!call->dir) { | |
916 | pr_warning("Could not create debugfs " | |
917 | "'%s' directory\n", call->name); | |
918 | return -1; | |
919 | } | |
920 | ||
6d723736 | 921 | if (call->regfunc) |
f3f3f009 FW |
922 | trace_create_file("enable", 0644, call->dir, call, |
923 | enable); | |
1473e441 | 924 | |
af6af30c | 925 | if (call->id && call->profile_enable) |
f3f3f009 FW |
926 | trace_create_file("id", 0444, call->dir, call, |
927 | id); | |
23725aee | 928 | |
cf027f64 | 929 | if (call->define_fields) { |
14be96c9 | 930 | ret = call->define_fields(call); |
cf027f64 TZ |
931 | if (ret < 0) { |
932 | pr_warning("Could not initialize trace point" | |
933 | " events/%s\n", call->name); | |
934 | return ret; | |
935 | } | |
f3f3f009 FW |
936 | trace_create_file("filter", 0644, call->dir, call, |
937 | filter); | |
cf027f64 TZ |
938 | } |
939 | ||
981d081e SR |
940 | /* A trace may not want to export its format */ |
941 | if (!call->show_format) | |
942 | return 0; | |
943 | ||
f3f3f009 FW |
944 | trace_create_file("format", 0444, call->dir, call, |
945 | format); | |
6d723736 SR |
946 | |
947 | return 0; | |
948 | } | |
949 | ||
bd1a5c84 MH |
950 | static int __trace_add_event_call(struct ftrace_event_call *call) |
951 | { | |
952 | struct dentry *d_events; | |
953 | int ret; | |
6d723736 | 954 | |
bd1a5c84 MH |
955 | if (!call->name) |
956 | return -EINVAL; | |
701970b3 | 957 | |
bd1a5c84 MH |
958 | if (call->raw_init) { |
959 | ret = call->raw_init(call); | |
960 | if (ret < 0) { | |
961 | if (ret != -ENOSYS) | |
962 | pr_warning("Could not initialize trace " | |
963 | "events/%s\n", call->name); | |
964 | return ret; | |
965 | } | |
966 | } | |
701970b3 | 967 | |
bd1a5c84 MH |
968 | d_events = event_trace_events_dir(); |
969 | if (!d_events) | |
970 | return -ENOENT; | |
971 | ||
588bebb7 | 972 | ret = event_create_dir(call, d_events, &ftrace_event_id_fops, |
bd1a5c84 MH |
973 | &ftrace_enable_fops, &ftrace_event_filter_fops, |
974 | &ftrace_event_format_fops); | |
88f70d75 MH |
975 | if (!ret) |
976 | list_add(&call->list, &ftrace_events); | |
977 | ||
588bebb7 | 978 | return ret; |
bd1a5c84 MH |
979 | } |
980 | ||
981 | /* Add an additional event_call dynamically */ | |
982 | int trace_add_event_call(struct ftrace_event_call *call) | |
983 | { | |
984 | int ret; | |
985 | mutex_lock(&event_mutex); | |
986 | ret = __trace_add_event_call(call); | |
987 | mutex_unlock(&event_mutex); | |
988 | return ret; | |
989 | } | |
701970b3 | 990 | |
a2ca5e03 FW |
991 | static void remove_subsystem_dir(const char *name) |
992 | { | |
993 | struct event_subsystem *system; | |
994 | ||
995 | if (strcmp(name, TRACE_SYSTEM) == 0) | |
996 | return; | |
997 | ||
998 | list_for_each_entry(system, &event_subsystems, list) { | |
999 | if (strcmp(system->name, name) == 0) { | |
1000 | if (!--system->nr_events) { | |
1001 | struct event_filter *filter = system->filter; | |
1002 | ||
1003 | debugfs_remove_recursive(system->entry); | |
1004 | list_del(&system->list); | |
1005 | if (filter) { | |
1006 | kfree(filter->filter_string); | |
1007 | kfree(filter); | |
1008 | } | |
1009 | kfree(system->name); | |
1010 | kfree(system); | |
1011 | } | |
1012 | break; | |
1013 | } | |
1014 | } | |
1015 | } | |
1016 | ||
4fead8e4 MH |
1017 | /* |
1018 | * Must be called under locking both of event_mutex and trace_event_mutex. | |
1019 | */ | |
bd1a5c84 MH |
1020 | static void __trace_remove_event_call(struct ftrace_event_call *call) |
1021 | { | |
1022 | ftrace_event_enable_disable(call, 0); | |
1023 | if (call->event) | |
1024 | __unregister_ftrace_event(call->event); | |
1025 | debugfs_remove_recursive(call->dir); | |
1026 | list_del(&call->list); | |
1027 | trace_destroy_fields(call); | |
1028 | destroy_preds(call); | |
1029 | remove_subsystem_dir(call->system); | |
1030 | } | |
1031 | ||
1032 | /* Remove an event_call */ | |
1033 | void trace_remove_event_call(struct ftrace_event_call *call) | |
1034 | { | |
1035 | mutex_lock(&event_mutex); | |
4fead8e4 | 1036 | down_write(&trace_event_mutex); |
bd1a5c84 | 1037 | __trace_remove_event_call(call); |
4fead8e4 | 1038 | up_write(&trace_event_mutex); |
bd1a5c84 MH |
1039 | mutex_unlock(&event_mutex); |
1040 | } | |
1041 | ||
1042 | #define for_each_event(event, start, end) \ | |
1043 | for (event = start; \ | |
1044 | (unsigned long)event < (unsigned long)end; \ | |
1045 | event++) | |
1046 | ||
1047 | #ifdef CONFIG_MODULES | |
1048 | ||
1049 | static LIST_HEAD(ftrace_module_file_list); | |
1050 | ||
1051 | /* | |
1052 | * Modules must own their file_operations to keep up with | |
1053 | * reference counting. | |
1054 | */ | |
1055 | struct ftrace_module_file_ops { | |
1056 | struct list_head list; | |
1057 | struct module *mod; | |
1058 | struct file_operations id; | |
1059 | struct file_operations enable; | |
1060 | struct file_operations format; | |
1061 | struct file_operations filter; | |
1062 | }; | |
1063 | ||
701970b3 SR |
1064 | static struct ftrace_module_file_ops * |
1065 | trace_create_file_ops(struct module *mod) | |
1066 | { | |
1067 | struct ftrace_module_file_ops *file_ops; | |
1068 | ||
1069 | /* | |
1070 | * This is a bit of a PITA. To allow for correct reference | |
1071 | * counting, modules must "own" their file_operations. | |
1072 | * To do this, we allocate the file operations that will be | |
1073 | * used in the event directory. | |
1074 | */ | |
1075 | ||
1076 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1077 | if (!file_ops) | |
1078 | return NULL; | |
1079 | ||
1080 | file_ops->mod = mod; | |
1081 | ||
1082 | file_ops->id = ftrace_event_id_fops; | |
1083 | file_ops->id.owner = mod; | |
1084 | ||
1085 | file_ops->enable = ftrace_enable_fops; | |
1086 | file_ops->enable.owner = mod; | |
1087 | ||
1088 | file_ops->filter = ftrace_event_filter_fops; | |
1089 | file_ops->filter.owner = mod; | |
1090 | ||
1091 | file_ops->format = ftrace_event_format_fops; | |
1092 | file_ops->format.owner = mod; | |
1093 | ||
1094 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1095 | ||
1096 | return file_ops; | |
1097 | } | |
1098 | ||
6d723736 SR |
1099 | static void trace_module_add_events(struct module *mod) |
1100 | { | |
701970b3 | 1101 | struct ftrace_module_file_ops *file_ops = NULL; |
6d723736 SR |
1102 | struct ftrace_event_call *call, *start, *end; |
1103 | struct dentry *d_events; | |
f744bd57 | 1104 | int ret; |
6d723736 SR |
1105 | |
1106 | start = mod->trace_events; | |
1107 | end = mod->trace_events + mod->num_trace_events; | |
1108 | ||
1109 | if (start == end) | |
1110 | return; | |
1111 | ||
1112 | d_events = event_trace_events_dir(); | |
1113 | if (!d_events) | |
1114 | return; | |
1115 | ||
1116 | for_each_event(call, start, end) { | |
1117 | /* The linker may leave blanks */ | |
1118 | if (!call->name) | |
1119 | continue; | |
f744bd57 | 1120 | if (call->raw_init) { |
bd1a5c84 | 1121 | ret = call->raw_init(call); |
f744bd57 JB |
1122 | if (ret < 0) { |
1123 | if (ret != -ENOSYS) | |
1124 | pr_warning("Could not initialize trace " | |
1125 | "point events/%s\n", call->name); | |
1126 | continue; | |
1127 | } | |
1128 | } | |
701970b3 SR |
1129 | /* |
1130 | * This module has events, create file ops for this module | |
1131 | * if not already done. | |
1132 | */ | |
1133 | if (!file_ops) { | |
1134 | file_ops = trace_create_file_ops(mod); | |
1135 | if (!file_ops) | |
1136 | return; | |
1137 | } | |
6d723736 | 1138 | call->mod = mod; |
88f70d75 MH |
1139 | ret = event_create_dir(call, d_events, |
1140 | &file_ops->id, &file_ops->enable, | |
1141 | &file_ops->filter, &file_ops->format); | |
1142 | if (!ret) | |
1143 | list_add(&call->list, &ftrace_events); | |
6d723736 SR |
1144 | } |
1145 | } | |
1146 | ||
1147 | static void trace_module_remove_events(struct module *mod) | |
1148 | { | |
701970b3 | 1149 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1150 | struct ftrace_event_call *call, *p; |
9456f0fa | 1151 | bool found = false; |
6d723736 | 1152 | |
110bf2b7 | 1153 | down_write(&trace_event_mutex); |
6d723736 SR |
1154 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1155 | if (call->mod == mod) { | |
9456f0fa | 1156 | found = true; |
bd1a5c84 | 1157 | __trace_remove_event_call(call); |
6d723736 SR |
1158 | } |
1159 | } | |
701970b3 SR |
1160 | |
1161 | /* Now free the file_operations */ | |
1162 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1163 | if (file_ops->mod == mod) | |
1164 | break; | |
1165 | } | |
1166 | if (&file_ops->list != &ftrace_module_file_list) { | |
1167 | list_del(&file_ops->list); | |
1168 | kfree(file_ops); | |
1169 | } | |
9456f0fa SR |
1170 | |
1171 | /* | |
1172 | * It is safest to reset the ring buffer if the module being unloaded | |
1173 | * registered any events. | |
1174 | */ | |
1175 | if (found) | |
1176 | tracing_reset_current_online_cpus(); | |
110bf2b7 | 1177 | up_write(&trace_event_mutex); |
6d723736 SR |
1178 | } |
1179 | ||
61f919a1 SR |
1180 | static int trace_module_notify(struct notifier_block *self, |
1181 | unsigned long val, void *data) | |
6d723736 SR |
1182 | { |
1183 | struct module *mod = data; | |
1184 | ||
1185 | mutex_lock(&event_mutex); | |
1186 | switch (val) { | |
1187 | case MODULE_STATE_COMING: | |
1188 | trace_module_add_events(mod); | |
1189 | break; | |
1190 | case MODULE_STATE_GOING: | |
1191 | trace_module_remove_events(mod); | |
1192 | break; | |
1193 | } | |
1194 | mutex_unlock(&event_mutex); | |
fd994989 | 1195 | |
1473e441 SR |
1196 | return 0; |
1197 | } | |
61f919a1 SR |
1198 | #else |
1199 | static int trace_module_notify(struct notifier_block *self, | |
1200 | unsigned long val, void *data) | |
1201 | { | |
1202 | return 0; | |
1203 | } | |
1204 | #endif /* CONFIG_MODULES */ | |
1473e441 | 1205 | |
ec827c7e | 1206 | static struct notifier_block trace_module_nb = { |
6d723736 SR |
1207 | .notifier_call = trace_module_notify, |
1208 | .priority = 0, | |
1209 | }; | |
1210 | ||
a59fd602 SR |
1211 | extern struct ftrace_event_call __start_ftrace_events[]; |
1212 | extern struct ftrace_event_call __stop_ftrace_events[]; | |
1213 | ||
020e5f85 LZ |
1214 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
1215 | ||
1216 | static __init int setup_trace_event(char *str) | |
1217 | { | |
1218 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
1219 | ring_buffer_expanded = 1; | |
1220 | tracing_selftest_disabled = 1; | |
1221 | ||
1222 | return 1; | |
1223 | } | |
1224 | __setup("trace_event=", setup_trace_event); | |
1225 | ||
b77e38aa SR |
1226 | static __init int event_trace_init(void) |
1227 | { | |
a59fd602 | 1228 | struct ftrace_event_call *call; |
b77e38aa SR |
1229 | struct dentry *d_tracer; |
1230 | struct dentry *entry; | |
1473e441 | 1231 | struct dentry *d_events; |
6d723736 | 1232 | int ret; |
020e5f85 LZ |
1233 | char *buf = bootup_event_buf; |
1234 | char *token; | |
b77e38aa SR |
1235 | |
1236 | d_tracer = tracing_init_dentry(); | |
1237 | if (!d_tracer) | |
1238 | return 0; | |
1239 | ||
2314c4ae SR |
1240 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
1241 | (void *)&show_event_seq_ops, | |
1242 | &ftrace_avail_fops); | |
1243 | if (!entry) | |
1244 | pr_warning("Could not create debugfs " | |
1245 | "'available_events' entry\n"); | |
1246 | ||
b77e38aa SR |
1247 | entry = debugfs_create_file("set_event", 0644, d_tracer, |
1248 | (void *)&show_set_event_seq_ops, | |
1249 | &ftrace_set_event_fops); | |
1250 | if (!entry) | |
1251 | pr_warning("Could not create debugfs " | |
1252 | "'set_event' entry\n"); | |
1253 | ||
1473e441 SR |
1254 | d_events = event_trace_events_dir(); |
1255 | if (!d_events) | |
1256 | return 0; | |
1257 | ||
d1b182a8 SR |
1258 | /* ring buffer internal formats */ |
1259 | trace_create_file("header_page", 0444, d_events, | |
1260 | ring_buffer_print_page_header, | |
1261 | &ftrace_show_header_fops); | |
1262 | ||
1263 | trace_create_file("header_event", 0444, d_events, | |
1264 | ring_buffer_print_entry_header, | |
1265 | &ftrace_show_header_fops); | |
1266 | ||
8ae79a13 | 1267 | trace_create_file("enable", 0644, d_events, |
8f31bfe5 | 1268 | NULL, &ftrace_system_enable_fops); |
8ae79a13 | 1269 | |
6d723736 | 1270 | for_each_event(call, __start_ftrace_events, __stop_ftrace_events) { |
1473e441 SR |
1271 | /* The linker may leave blanks */ |
1272 | if (!call->name) | |
1273 | continue; | |
f744bd57 | 1274 | if (call->raw_init) { |
bd1a5c84 | 1275 | ret = call->raw_init(call); |
f744bd57 JB |
1276 | if (ret < 0) { |
1277 | if (ret != -ENOSYS) | |
1278 | pr_warning("Could not initialize trace " | |
1279 | "point events/%s\n", call->name); | |
1280 | continue; | |
1281 | } | |
1282 | } | |
88f70d75 MH |
1283 | ret = event_create_dir(call, d_events, &ftrace_event_id_fops, |
1284 | &ftrace_enable_fops, | |
1285 | &ftrace_event_filter_fops, | |
1286 | &ftrace_event_format_fops); | |
1287 | if (!ret) | |
1288 | list_add(&call->list, &ftrace_events); | |
1473e441 SR |
1289 | } |
1290 | ||
020e5f85 LZ |
1291 | while (true) { |
1292 | token = strsep(&buf, ","); | |
1293 | ||
1294 | if (!token) | |
1295 | break; | |
1296 | if (!*token) | |
1297 | continue; | |
1298 | ||
1299 | ret = ftrace_set_clr_event(token, 1); | |
1300 | if (ret) | |
1301 | pr_warning("Failed to enable trace event: %s\n", token); | |
1302 | } | |
1303 | ||
6d723736 | 1304 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 1305 | if (ret) |
6d723736 SR |
1306 | pr_warning("Failed to register trace events module notifier\n"); |
1307 | ||
b77e38aa SR |
1308 | return 0; |
1309 | } | |
1310 | fs_initcall(event_trace_init); | |
e6187007 SR |
1311 | |
1312 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1313 | ||
1314 | static DEFINE_SPINLOCK(test_spinlock); | |
1315 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
1316 | static DEFINE_MUTEX(test_mutex); | |
1317 | ||
1318 | static __init void test_work(struct work_struct *dummy) | |
1319 | { | |
1320 | spin_lock(&test_spinlock); | |
1321 | spin_lock_irq(&test_spinlock_irq); | |
1322 | udelay(1); | |
1323 | spin_unlock_irq(&test_spinlock_irq); | |
1324 | spin_unlock(&test_spinlock); | |
1325 | ||
1326 | mutex_lock(&test_mutex); | |
1327 | msleep(1); | |
1328 | mutex_unlock(&test_mutex); | |
1329 | } | |
1330 | ||
1331 | static __init int event_test_thread(void *unused) | |
1332 | { | |
1333 | void *test_malloc; | |
1334 | ||
1335 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
1336 | if (!test_malloc) | |
1337 | pr_info("failed to kmalloc\n"); | |
1338 | ||
1339 | schedule_on_each_cpu(test_work); | |
1340 | ||
1341 | kfree(test_malloc); | |
1342 | ||
1343 | set_current_state(TASK_INTERRUPTIBLE); | |
1344 | while (!kthread_should_stop()) | |
1345 | schedule(); | |
1346 | ||
1347 | return 0; | |
1348 | } | |
1349 | ||
1350 | /* | |
1351 | * Do various things that may trigger events. | |
1352 | */ | |
1353 | static __init void event_test_stuff(void) | |
1354 | { | |
1355 | struct task_struct *test_thread; | |
1356 | ||
1357 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
1358 | msleep(1); | |
1359 | kthread_stop(test_thread); | |
1360 | } | |
1361 | ||
1362 | /* | |
1363 | * For every trace event defined, we will test each trace point separately, | |
1364 | * and then by groups, and finally all trace points. | |
1365 | */ | |
9ea21c1e | 1366 | static __init void event_trace_self_tests(void) |
e6187007 SR |
1367 | { |
1368 | struct ftrace_event_call *call; | |
1369 | struct event_subsystem *system; | |
e6187007 SR |
1370 | int ret; |
1371 | ||
1372 | pr_info("Running tests on trace events:\n"); | |
1373 | ||
1374 | list_for_each_entry(call, &ftrace_events, list) { | |
1375 | ||
1376 | /* Only test those that have a regfunc */ | |
1377 | if (!call->regfunc) | |
1378 | continue; | |
1379 | ||
1f5a6b45 SR |
1380 | /* |
1381 | * Testing syscall events here is pretty useless, but | |
1382 | * we still do it if configured. But this is time consuming. | |
1383 | * What we really need is a user thread to perform the | |
1384 | * syscalls as we test. | |
1385 | */ | |
1386 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
1387 | if (call->system && | |
1388 | strcmp(call->system, "syscalls") == 0) | |
1389 | continue; | |
1390 | #endif | |
1391 | ||
e6187007 SR |
1392 | pr_info("Testing event %s: ", call->name); |
1393 | ||
1394 | /* | |
1395 | * If an event is already enabled, someone is using | |
1396 | * it and the self test should not be on. | |
1397 | */ | |
1398 | if (call->enabled) { | |
1399 | pr_warning("Enabled event during self test!\n"); | |
1400 | WARN_ON_ONCE(1); | |
1401 | continue; | |
1402 | } | |
1403 | ||
0e907c99 | 1404 | ftrace_event_enable_disable(call, 1); |
e6187007 | 1405 | event_test_stuff(); |
0e907c99 | 1406 | ftrace_event_enable_disable(call, 0); |
e6187007 SR |
1407 | |
1408 | pr_cont("OK\n"); | |
1409 | } | |
1410 | ||
1411 | /* Now test at the sub system level */ | |
1412 | ||
1413 | pr_info("Running tests on trace event systems:\n"); | |
1414 | ||
1415 | list_for_each_entry(system, &event_subsystems, list) { | |
1416 | ||
1417 | /* the ftrace system is special, skip it */ | |
1418 | if (strcmp(system->name, "ftrace") == 0) | |
1419 | continue; | |
1420 | ||
1421 | pr_info("Testing event system %s: ", system->name); | |
1422 | ||
8f31bfe5 | 1423 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1); |
e6187007 SR |
1424 | if (WARN_ON_ONCE(ret)) { |
1425 | pr_warning("error enabling system %s\n", | |
1426 | system->name); | |
1427 | continue; | |
1428 | } | |
1429 | ||
1430 | event_test_stuff(); | |
1431 | ||
8f31bfe5 | 1432 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0); |
e6187007 SR |
1433 | if (WARN_ON_ONCE(ret)) |
1434 | pr_warning("error disabling system %s\n", | |
1435 | system->name); | |
1436 | ||
1437 | pr_cont("OK\n"); | |
1438 | } | |
1439 | ||
1440 | /* Test with all events enabled */ | |
1441 | ||
1442 | pr_info("Running tests on all trace events:\n"); | |
1443 | pr_info("Testing all events: "); | |
1444 | ||
8f31bfe5 | 1445 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1); |
e6187007 | 1446 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 1447 | pr_warning("error enabling all events\n"); |
9ea21c1e | 1448 | return; |
e6187007 SR |
1449 | } |
1450 | ||
1451 | event_test_stuff(); | |
1452 | ||
1453 | /* reset sysname */ | |
8f31bfe5 | 1454 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0); |
e6187007 SR |
1455 | if (WARN_ON_ONCE(ret)) { |
1456 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 1457 | return; |
e6187007 SR |
1458 | } |
1459 | ||
1460 | pr_cont("OK\n"); | |
9ea21c1e SR |
1461 | } |
1462 | ||
1463 | #ifdef CONFIG_FUNCTION_TRACER | |
1464 | ||
245b2e70 | 1465 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e SR |
1466 | |
1467 | static void | |
1468 | function_test_events_call(unsigned long ip, unsigned long parent_ip) | |
1469 | { | |
1470 | struct ring_buffer_event *event; | |
e77405ad | 1471 | struct ring_buffer *buffer; |
9ea21c1e SR |
1472 | struct ftrace_entry *entry; |
1473 | unsigned long flags; | |
1474 | long disabled; | |
1475 | int resched; | |
1476 | int cpu; | |
1477 | int pc; | |
1478 | ||
1479 | pc = preempt_count(); | |
1480 | resched = ftrace_preempt_disable(); | |
1481 | cpu = raw_smp_processor_id(); | |
245b2e70 | 1482 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
1483 | |
1484 | if (disabled != 1) | |
1485 | goto out; | |
1486 | ||
1487 | local_save_flags(flags); | |
1488 | ||
e77405ad SR |
1489 | event = trace_current_buffer_lock_reserve(&buffer, |
1490 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
1491 | flags, pc); |
1492 | if (!event) | |
1493 | goto out; | |
1494 | entry = ring_buffer_event_data(event); | |
1495 | entry->ip = ip; | |
1496 | entry->parent_ip = parent_ip; | |
1497 | ||
e77405ad | 1498 | trace_nowake_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
1499 | |
1500 | out: | |
245b2e70 | 1501 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
1502 | ftrace_preempt_enable(resched); |
1503 | } | |
1504 | ||
1505 | static struct ftrace_ops trace_ops __initdata = | |
1506 | { | |
1507 | .func = function_test_events_call, | |
1508 | }; | |
1509 | ||
1510 | static __init void event_trace_self_test_with_function(void) | |
1511 | { | |
1512 | register_ftrace_function(&trace_ops); | |
1513 | pr_info("Running tests again, along with the function tracer\n"); | |
1514 | event_trace_self_tests(); | |
1515 | unregister_ftrace_function(&trace_ops); | |
1516 | } | |
1517 | #else | |
1518 | static __init void event_trace_self_test_with_function(void) | |
1519 | { | |
1520 | } | |
1521 | #endif | |
1522 | ||
1523 | static __init int event_trace_self_tests_init(void) | |
1524 | { | |
020e5f85 LZ |
1525 | if (!tracing_selftest_disabled) { |
1526 | event_trace_self_tests(); | |
1527 | event_trace_self_test_with_function(); | |
1528 | } | |
e6187007 SR |
1529 | |
1530 | return 0; | |
1531 | } | |
1532 | ||
28d20e2d | 1533 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
1534 | |
1535 | #endif |