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Commit | Line | Data |
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b77e38aa SR |
1 | /* |
2 | * event tracer | |
3 | * | |
4 | * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> | |
5 | * | |
981d081e SR |
6 | * - Added format output of fields of the trace point. |
7 | * This was based off of work by Tom Zanussi <tzanussi@gmail.com>. | |
8 | * | |
b77e38aa SR |
9 | */ |
10 | ||
e6187007 SR |
11 | #include <linux/workqueue.h> |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/kthread.h> | |
b77e38aa SR |
14 | #include <linux/debugfs.h> |
15 | #include <linux/uaccess.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/ctype.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
e6187007 | 19 | #include <linux/delay.h> |
b77e38aa | 20 | |
020e5f85 LZ |
21 | #include <asm/setup.h> |
22 | ||
91729ef9 | 23 | #include "trace_output.h" |
b77e38aa | 24 | |
4e5292ea | 25 | #undef TRACE_SYSTEM |
b628b3e6 SR |
26 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
27 | ||
20c8928a | 28 | DEFINE_MUTEX(event_mutex); |
11a241a3 | 29 | |
04295780 SR |
30 | DEFINE_MUTEX(event_storage_mutex); |
31 | EXPORT_SYMBOL_GPL(event_storage_mutex); | |
32 | ||
33 | char event_storage[EVENT_STORAGE_SIZE]; | |
34 | EXPORT_SYMBOL_GPL(event_storage); | |
35 | ||
a59fd602 | 36 | LIST_HEAD(ftrace_events); |
8728fe50 | 37 | LIST_HEAD(ftrace_common_fields); |
a59fd602 | 38 | |
2e33af02 SR |
39 | struct list_head * |
40 | trace_get_fields(struct ftrace_event_call *event_call) | |
41 | { | |
42 | if (!event_call->class->get_fields) | |
43 | return &event_call->class->fields; | |
44 | return event_call->class->get_fields(event_call); | |
45 | } | |
46 | ||
8728fe50 LZ |
47 | static int __trace_define_field(struct list_head *head, const char *type, |
48 | const char *name, int offset, int size, | |
49 | int is_signed, int filter_type) | |
cf027f64 TZ |
50 | { |
51 | struct ftrace_event_field *field; | |
52 | ||
fe9f57f2 | 53 | field = kzalloc(sizeof(*field), GFP_KERNEL); |
cf027f64 TZ |
54 | if (!field) |
55 | goto err; | |
fe9f57f2 | 56 | |
cf027f64 TZ |
57 | field->name = kstrdup(name, GFP_KERNEL); |
58 | if (!field->name) | |
59 | goto err; | |
fe9f57f2 | 60 | |
cf027f64 TZ |
61 | field->type = kstrdup(type, GFP_KERNEL); |
62 | if (!field->type) | |
63 | goto err; | |
fe9f57f2 | 64 | |
43b51ead LZ |
65 | if (filter_type == FILTER_OTHER) |
66 | field->filter_type = filter_assign_type(type); | |
67 | else | |
68 | field->filter_type = filter_type; | |
69 | ||
cf027f64 TZ |
70 | field->offset = offset; |
71 | field->size = size; | |
a118e4d1 | 72 | field->is_signed = is_signed; |
aa38e9fc | 73 | |
2e33af02 | 74 | list_add(&field->link, head); |
cf027f64 TZ |
75 | |
76 | return 0; | |
fe9f57f2 | 77 | |
cf027f64 | 78 | err: |
7b60997f | 79 | if (field) |
cf027f64 | 80 | kfree(field->name); |
cf027f64 | 81 | kfree(field); |
fe9f57f2 | 82 | |
cf027f64 TZ |
83 | return -ENOMEM; |
84 | } | |
8728fe50 LZ |
85 | |
86 | int trace_define_field(struct ftrace_event_call *call, const char *type, | |
87 | const char *name, int offset, int size, int is_signed, | |
88 | int filter_type) | |
89 | { | |
90 | struct list_head *head; | |
91 | ||
92 | if (WARN_ON(!call->class)) | |
93 | return 0; | |
94 | ||
95 | head = trace_get_fields(call); | |
96 | return __trace_define_field(head, type, name, offset, size, | |
97 | is_signed, filter_type); | |
98 | } | |
17c873ec | 99 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 100 | |
e647d6b3 | 101 | #define __common_field(type, item) \ |
8728fe50 LZ |
102 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
103 | "common_" #item, \ | |
104 | offsetof(typeof(ent), item), \ | |
105 | sizeof(ent.item), \ | |
106 | is_signed_type(type), FILTER_OTHER); \ | |
e647d6b3 LZ |
107 | if (ret) \ |
108 | return ret; | |
109 | ||
8728fe50 | 110 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
111 | { |
112 | int ret; | |
113 | struct trace_entry ent; | |
114 | ||
115 | __common_field(unsigned short, type); | |
116 | __common_field(unsigned char, flags); | |
117 | __common_field(unsigned char, preempt_count); | |
118 | __common_field(int, pid); | |
a3a4a5ac | 119 | __common_field(int, padding); |
e647d6b3 LZ |
120 | |
121 | return ret; | |
122 | } | |
123 | ||
bd1a5c84 | 124 | void trace_destroy_fields(struct ftrace_event_call *call) |
2df75e41 LZ |
125 | { |
126 | struct ftrace_event_field *field, *next; | |
2e33af02 | 127 | struct list_head *head; |
2df75e41 | 128 | |
2e33af02 SR |
129 | head = trace_get_fields(call); |
130 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 LZ |
131 | list_del(&field->link); |
132 | kfree(field->type); | |
133 | kfree(field->name); | |
134 | kfree(field); | |
135 | } | |
136 | } | |
137 | ||
87d9b4e1 LZ |
138 | int trace_event_raw_init(struct ftrace_event_call *call) |
139 | { | |
140 | int id; | |
141 | ||
80decc70 | 142 | id = register_ftrace_event(&call->event); |
87d9b4e1 LZ |
143 | if (!id) |
144 | return -ENODEV; | |
87d9b4e1 LZ |
145 | |
146 | return 0; | |
147 | } | |
148 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
149 | ||
a1d0ce82 SR |
150 | int ftrace_event_reg(struct ftrace_event_call *call, enum trace_reg type) |
151 | { | |
152 | switch (type) { | |
153 | case TRACE_REG_REGISTER: | |
154 | return tracepoint_probe_register(call->name, | |
155 | call->class->probe, | |
156 | call); | |
157 | case TRACE_REG_UNREGISTER: | |
158 | tracepoint_probe_unregister(call->name, | |
159 | call->class->probe, | |
160 | call); | |
161 | return 0; | |
162 | ||
163 | #ifdef CONFIG_PERF_EVENTS | |
164 | case TRACE_REG_PERF_REGISTER: | |
165 | return tracepoint_probe_register(call->name, | |
166 | call->class->perf_probe, | |
167 | call); | |
168 | case TRACE_REG_PERF_UNREGISTER: | |
169 | tracepoint_probe_unregister(call->name, | |
170 | call->class->perf_probe, | |
171 | call); | |
172 | return 0; | |
173 | #endif | |
174 | } | |
175 | return 0; | |
176 | } | |
177 | EXPORT_SYMBOL_GPL(ftrace_event_reg); | |
178 | ||
e870e9a1 LZ |
179 | void trace_event_enable_cmd_record(bool enable) |
180 | { | |
181 | struct ftrace_event_call *call; | |
182 | ||
183 | mutex_lock(&event_mutex); | |
184 | list_for_each_entry(call, &ftrace_events, list) { | |
185 | if (!(call->flags & TRACE_EVENT_FL_ENABLED)) | |
186 | continue; | |
187 | ||
188 | if (enable) { | |
189 | tracing_start_cmdline_record(); | |
190 | call->flags |= TRACE_EVENT_FL_RECORDED_CMD; | |
191 | } else { | |
192 | tracing_stop_cmdline_record(); | |
193 | call->flags &= ~TRACE_EVENT_FL_RECORDED_CMD; | |
194 | } | |
195 | } | |
196 | mutex_unlock(&event_mutex); | |
197 | } | |
198 | ||
3b8e4273 | 199 | static int ftrace_event_enable_disable(struct ftrace_event_call *call, |
fd994989 SR |
200 | int enable) |
201 | { | |
3b8e4273 LZ |
202 | int ret = 0; |
203 | ||
fd994989 SR |
204 | switch (enable) { |
205 | case 0: | |
553552ce SR |
206 | if (call->flags & TRACE_EVENT_FL_ENABLED) { |
207 | call->flags &= ~TRACE_EVENT_FL_ENABLED; | |
e870e9a1 LZ |
208 | if (call->flags & TRACE_EVENT_FL_RECORDED_CMD) { |
209 | tracing_stop_cmdline_record(); | |
210 | call->flags &= ~TRACE_EVENT_FL_RECORDED_CMD; | |
211 | } | |
a1d0ce82 | 212 | call->class->reg(call, TRACE_REG_UNREGISTER); |
fd994989 | 213 | } |
fd994989 SR |
214 | break; |
215 | case 1: | |
553552ce | 216 | if (!(call->flags & TRACE_EVENT_FL_ENABLED)) { |
e870e9a1 LZ |
217 | if (trace_flags & TRACE_ITER_RECORD_CMD) { |
218 | tracing_start_cmdline_record(); | |
219 | call->flags |= TRACE_EVENT_FL_RECORDED_CMD; | |
220 | } | |
a1d0ce82 | 221 | ret = call->class->reg(call, TRACE_REG_REGISTER); |
3b8e4273 LZ |
222 | if (ret) { |
223 | tracing_stop_cmdline_record(); | |
224 | pr_info("event trace: Could not enable event " | |
225 | "%s\n", call->name); | |
226 | break; | |
227 | } | |
553552ce | 228 | call->flags |= TRACE_EVENT_FL_ENABLED; |
fd994989 | 229 | } |
fd994989 SR |
230 | break; |
231 | } | |
3b8e4273 LZ |
232 | |
233 | return ret; | |
fd994989 SR |
234 | } |
235 | ||
0e907c99 Z |
236 | static void ftrace_clear_events(void) |
237 | { | |
238 | struct ftrace_event_call *call; | |
239 | ||
240 | mutex_lock(&event_mutex); | |
241 | list_for_each_entry(call, &ftrace_events, list) { | |
242 | ftrace_event_enable_disable(call, 0); | |
243 | } | |
244 | mutex_unlock(&event_mutex); | |
245 | } | |
246 | ||
8f31bfe5 LZ |
247 | /* |
248 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
249 | */ | |
250 | static int __ftrace_set_clr_event(const char *match, const char *sub, | |
251 | const char *event, int set) | |
b77e38aa | 252 | { |
a59fd602 | 253 | struct ftrace_event_call *call; |
29f93943 | 254 | int ret = -EINVAL; |
8f31bfe5 LZ |
255 | |
256 | mutex_lock(&event_mutex); | |
257 | list_for_each_entry(call, &ftrace_events, list) { | |
258 | ||
a1d0ce82 | 259 | if (!call->name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
260 | continue; |
261 | ||
262 | if (match && | |
263 | strcmp(match, call->name) != 0 && | |
8f082018 | 264 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
265 | continue; |
266 | ||
8f082018 | 267 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
268 | continue; |
269 | ||
270 | if (event && strcmp(event, call->name) != 0) | |
271 | continue; | |
272 | ||
273 | ftrace_event_enable_disable(call, set); | |
274 | ||
275 | ret = 0; | |
276 | } | |
277 | mutex_unlock(&event_mutex); | |
278 | ||
279 | return ret; | |
280 | } | |
281 | ||
282 | static int ftrace_set_clr_event(char *buf, int set) | |
283 | { | |
b628b3e6 | 284 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
285 | |
286 | /* | |
287 | * The buf format can be <subsystem>:<event-name> | |
288 | * *:<event-name> means any event by that name. | |
289 | * :<event-name> is the same. | |
290 | * | |
291 | * <subsystem>:* means all events in that subsystem | |
292 | * <subsystem>: means the same. | |
293 | * | |
294 | * <name> (no ':') means all events in a subsystem with | |
295 | * the name <name> or any event that matches <name> | |
296 | */ | |
297 | ||
298 | match = strsep(&buf, ":"); | |
299 | if (buf) { | |
300 | sub = match; | |
301 | event = buf; | |
302 | match = NULL; | |
303 | ||
304 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
305 | sub = NULL; | |
306 | if (!strlen(event) || strcmp(event, "*") == 0) | |
307 | event = NULL; | |
308 | } | |
b77e38aa | 309 | |
8f31bfe5 | 310 | return __ftrace_set_clr_event(match, sub, event, set); |
b77e38aa SR |
311 | } |
312 | ||
4671c794 SR |
313 | /** |
314 | * trace_set_clr_event - enable or disable an event | |
315 | * @system: system name to match (NULL for any system) | |
316 | * @event: event name to match (NULL for all events, within system) | |
317 | * @set: 1 to enable, 0 to disable | |
318 | * | |
319 | * This is a way for other parts of the kernel to enable or disable | |
320 | * event recording. | |
321 | * | |
322 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
323 | * registered events. | |
324 | */ | |
325 | int trace_set_clr_event(const char *system, const char *event, int set) | |
326 | { | |
327 | return __ftrace_set_clr_event(NULL, system, event, set); | |
328 | } | |
56355b83 | 329 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 330 | |
b77e38aa SR |
331 | /* 128 should be much more than enough */ |
332 | #define EVENT_BUF_SIZE 127 | |
333 | ||
334 | static ssize_t | |
335 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
336 | size_t cnt, loff_t *ppos) | |
337 | { | |
48966364 | 338 | struct trace_parser parser; |
4ba7978e | 339 | ssize_t read, ret; |
b77e38aa | 340 | |
4ba7978e | 341 | if (!cnt) |
b77e38aa SR |
342 | return 0; |
343 | ||
1852fcce SR |
344 | ret = tracing_update_buffers(); |
345 | if (ret < 0) | |
346 | return ret; | |
347 | ||
48966364 | 348 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
349 | return -ENOMEM; |
350 | ||
48966364 | 351 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
352 | ||
4ba7978e | 353 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 354 | int set = 1; |
b77e38aa | 355 | |
48966364 | 356 | if (*parser.buffer == '!') |
b77e38aa | 357 | set = 0; |
b77e38aa | 358 | |
48966364 | 359 | parser.buffer[parser.idx] = 0; |
360 | ||
361 | ret = ftrace_set_clr_event(parser.buffer + !set, set); | |
b77e38aa | 362 | if (ret) |
48966364 | 363 | goto out_put; |
b77e38aa | 364 | } |
b77e38aa SR |
365 | |
366 | ret = read; | |
367 | ||
48966364 | 368 | out_put: |
369 | trace_parser_put(&parser); | |
b77e38aa SR |
370 | |
371 | return ret; | |
372 | } | |
373 | ||
374 | static void * | |
375 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
376 | { | |
30bd39cd | 377 | struct ftrace_event_call *call = v; |
b77e38aa SR |
378 | |
379 | (*pos)++; | |
380 | ||
30bd39cd | 381 | list_for_each_entry_continue(call, &ftrace_events, list) { |
40e26815 SR |
382 | /* |
383 | * The ftrace subsystem is for showing formats only. | |
384 | * They can not be enabled or disabled via the event files. | |
385 | */ | |
a1d0ce82 | 386 | if (call->class && call->class->reg) |
30bd39cd | 387 | return call; |
40e26815 | 388 | } |
b77e38aa | 389 | |
30bd39cd | 390 | return NULL; |
b77e38aa SR |
391 | } |
392 | ||
393 | static void *t_start(struct seq_file *m, loff_t *pos) | |
394 | { | |
30bd39cd | 395 | struct ftrace_event_call *call; |
e1c7e2a6 LZ |
396 | loff_t l; |
397 | ||
20c8928a | 398 | mutex_lock(&event_mutex); |
e1c7e2a6 | 399 | |
30bd39cd | 400 | call = list_entry(&ftrace_events, struct ftrace_event_call, list); |
e1c7e2a6 | 401 | for (l = 0; l <= *pos; ) { |
30bd39cd | 402 | call = t_next(m, call, &l); |
e1c7e2a6 LZ |
403 | if (!call) |
404 | break; | |
405 | } | |
406 | return call; | |
b77e38aa SR |
407 | } |
408 | ||
409 | static void * | |
410 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
411 | { | |
30bd39cd | 412 | struct ftrace_event_call *call = v; |
b77e38aa SR |
413 | |
414 | (*pos)++; | |
415 | ||
30bd39cd | 416 | list_for_each_entry_continue(call, &ftrace_events, list) { |
553552ce | 417 | if (call->flags & TRACE_EVENT_FL_ENABLED) |
30bd39cd | 418 | return call; |
b77e38aa SR |
419 | } |
420 | ||
30bd39cd | 421 | return NULL; |
b77e38aa SR |
422 | } |
423 | ||
424 | static void *s_start(struct seq_file *m, loff_t *pos) | |
425 | { | |
30bd39cd | 426 | struct ftrace_event_call *call; |
e1c7e2a6 LZ |
427 | loff_t l; |
428 | ||
20c8928a | 429 | mutex_lock(&event_mutex); |
e1c7e2a6 | 430 | |
30bd39cd | 431 | call = list_entry(&ftrace_events, struct ftrace_event_call, list); |
e1c7e2a6 | 432 | for (l = 0; l <= *pos; ) { |
30bd39cd | 433 | call = s_next(m, call, &l); |
e1c7e2a6 LZ |
434 | if (!call) |
435 | break; | |
436 | } | |
437 | return call; | |
b77e38aa SR |
438 | } |
439 | ||
440 | static int t_show(struct seq_file *m, void *v) | |
441 | { | |
442 | struct ftrace_event_call *call = v; | |
443 | ||
8f082018 SR |
444 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
445 | seq_printf(m, "%s:", call->class->system); | |
b77e38aa SR |
446 | seq_printf(m, "%s\n", call->name); |
447 | ||
448 | return 0; | |
449 | } | |
450 | ||
451 | static void t_stop(struct seq_file *m, void *p) | |
452 | { | |
20c8928a | 453 | mutex_unlock(&event_mutex); |
b77e38aa SR |
454 | } |
455 | ||
456 | static int | |
457 | ftrace_event_seq_open(struct inode *inode, struct file *file) | |
458 | { | |
b77e38aa SR |
459 | const struct seq_operations *seq_ops; |
460 | ||
461 | if ((file->f_mode & FMODE_WRITE) && | |
8650ae32 | 462 | (file->f_flags & O_TRUNC)) |
b77e38aa SR |
463 | ftrace_clear_events(); |
464 | ||
465 | seq_ops = inode->i_private; | |
20c8928a | 466 | return seq_open(file, seq_ops); |
b77e38aa SR |
467 | } |
468 | ||
1473e441 SR |
469 | static ssize_t |
470 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
471 | loff_t *ppos) | |
472 | { | |
473 | struct ftrace_event_call *call = filp->private_data; | |
474 | char *buf; | |
475 | ||
553552ce | 476 | if (call->flags & TRACE_EVENT_FL_ENABLED) |
1473e441 SR |
477 | buf = "1\n"; |
478 | else | |
479 | buf = "0\n"; | |
480 | ||
481 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
482 | } | |
483 | ||
484 | static ssize_t | |
485 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
486 | loff_t *ppos) | |
487 | { | |
488 | struct ftrace_event_call *call = filp->private_data; | |
489 | char buf[64]; | |
490 | unsigned long val; | |
491 | int ret; | |
492 | ||
493 | if (cnt >= sizeof(buf)) | |
494 | return -EINVAL; | |
495 | ||
496 | if (copy_from_user(&buf, ubuf, cnt)) | |
497 | return -EFAULT; | |
498 | ||
499 | buf[cnt] = 0; | |
500 | ||
501 | ret = strict_strtoul(buf, 10, &val); | |
502 | if (ret < 0) | |
503 | return ret; | |
504 | ||
1852fcce SR |
505 | ret = tracing_update_buffers(); |
506 | if (ret < 0) | |
507 | return ret; | |
508 | ||
1473e441 SR |
509 | switch (val) { |
510 | case 0: | |
1473e441 | 511 | case 1: |
11a241a3 | 512 | mutex_lock(&event_mutex); |
3b8e4273 | 513 | ret = ftrace_event_enable_disable(call, val); |
11a241a3 | 514 | mutex_unlock(&event_mutex); |
1473e441 SR |
515 | break; |
516 | ||
517 | default: | |
518 | return -EINVAL; | |
519 | } | |
520 | ||
521 | *ppos += cnt; | |
522 | ||
3b8e4273 | 523 | return ret ? ret : cnt; |
1473e441 SR |
524 | } |
525 | ||
8ae79a13 SR |
526 | static ssize_t |
527 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
528 | loff_t *ppos) | |
529 | { | |
c142b15d | 530 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
8ae79a13 SR |
531 | const char *system = filp->private_data; |
532 | struct ftrace_event_call *call; | |
533 | char buf[2]; | |
c142b15d | 534 | int set = 0; |
8ae79a13 SR |
535 | int ret; |
536 | ||
8ae79a13 SR |
537 | mutex_lock(&event_mutex); |
538 | list_for_each_entry(call, &ftrace_events, list) { | |
a1d0ce82 | 539 | if (!call->name || !call->class || !call->class->reg) |
8ae79a13 SR |
540 | continue; |
541 | ||
8f082018 | 542 | if (system && strcmp(call->class->system, system) != 0) |
8ae79a13 SR |
543 | continue; |
544 | ||
545 | /* | |
546 | * We need to find out if all the events are set | |
547 | * or if all events or cleared, or if we have | |
548 | * a mixture. | |
549 | */ | |
553552ce | 550 | set |= (1 << !!(call->flags & TRACE_EVENT_FL_ENABLED)); |
c142b15d | 551 | |
8ae79a13 SR |
552 | /* |
553 | * If we have a mixture, no need to look further. | |
554 | */ | |
c142b15d | 555 | if (set == 3) |
8ae79a13 SR |
556 | break; |
557 | } | |
558 | mutex_unlock(&event_mutex); | |
559 | ||
c142b15d | 560 | buf[0] = set_to_char[set]; |
8ae79a13 | 561 | buf[1] = '\n'; |
8ae79a13 SR |
562 | |
563 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
564 | ||
565 | return ret; | |
566 | } | |
567 | ||
568 | static ssize_t | |
569 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
570 | loff_t *ppos) | |
571 | { | |
572 | const char *system = filp->private_data; | |
573 | unsigned long val; | |
8ae79a13 SR |
574 | char buf[64]; |
575 | ssize_t ret; | |
576 | ||
577 | if (cnt >= sizeof(buf)) | |
578 | return -EINVAL; | |
579 | ||
580 | if (copy_from_user(&buf, ubuf, cnt)) | |
581 | return -EFAULT; | |
582 | ||
583 | buf[cnt] = 0; | |
584 | ||
585 | ret = strict_strtoul(buf, 10, &val); | |
586 | if (ret < 0) | |
587 | return ret; | |
588 | ||
589 | ret = tracing_update_buffers(); | |
590 | if (ret < 0) | |
591 | return ret; | |
592 | ||
8f31bfe5 | 593 | if (val != 0 && val != 1) |
8ae79a13 | 594 | return -EINVAL; |
8ae79a13 | 595 | |
8f31bfe5 | 596 | ret = __ftrace_set_clr_event(NULL, system, NULL, val); |
8ae79a13 | 597 | if (ret) |
8f31bfe5 | 598 | goto out; |
8ae79a13 SR |
599 | |
600 | ret = cnt; | |
601 | ||
8f31bfe5 | 602 | out: |
8ae79a13 SR |
603 | *ppos += cnt; |
604 | ||
605 | return ret; | |
606 | } | |
607 | ||
2a37a3df SR |
608 | enum { |
609 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
610 | FORMAT_FIELD_SEPERATOR = 2, |
611 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
612 | }; |
613 | ||
614 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 615 | { |
2a37a3df | 616 | struct ftrace_event_call *call = m->private; |
5a65e956 | 617 | struct ftrace_event_field *field; |
86397dc3 LZ |
618 | struct list_head *common_head = &ftrace_common_fields; |
619 | struct list_head *head = trace_get_fields(call); | |
981d081e | 620 | |
2a37a3df | 621 | (*pos)++; |
5a65e956 | 622 | |
2a37a3df SR |
623 | switch ((unsigned long)v) { |
624 | case FORMAT_HEADER: | |
86397dc3 LZ |
625 | if (unlikely(list_empty(common_head))) |
626 | return NULL; | |
627 | ||
628 | field = list_entry(common_head->prev, | |
629 | struct ftrace_event_field, link); | |
630 | return field; | |
5a65e956 | 631 | |
86397dc3 | 632 | case FORMAT_FIELD_SEPERATOR: |
2a37a3df SR |
633 | if (unlikely(list_empty(head))) |
634 | return NULL; | |
5a65e956 | 635 | |
2a37a3df SR |
636 | field = list_entry(head->prev, struct ftrace_event_field, link); |
637 | return field; | |
5a65e956 | 638 | |
2a37a3df SR |
639 | case FORMAT_PRINTFMT: |
640 | /* all done */ | |
641 | return NULL; | |
5a65e956 LJ |
642 | } |
643 | ||
2a37a3df | 644 | field = v; |
86397dc3 LZ |
645 | if (field->link.prev == common_head) |
646 | return (void *)FORMAT_FIELD_SEPERATOR; | |
647 | else if (field->link.prev == head) | |
2a37a3df SR |
648 | return (void *)FORMAT_PRINTFMT; |
649 | ||
650 | field = list_entry(field->link.prev, struct ftrace_event_field, link); | |
651 | ||
2a37a3df | 652 | return field; |
8728fe50 | 653 | } |
5a65e956 | 654 | |
2a37a3df | 655 | static void *f_start(struct seq_file *m, loff_t *pos) |
8728fe50 | 656 | { |
2a37a3df SR |
657 | loff_t l = 0; |
658 | void *p; | |
5a65e956 | 659 | |
2a37a3df SR |
660 | /* Start by showing the header */ |
661 | if (!*pos) | |
662 | return (void *)FORMAT_HEADER; | |
663 | ||
664 | p = (void *)FORMAT_HEADER; | |
665 | do { | |
666 | p = f_next(m, p, &l); | |
667 | } while (p && l < *pos); | |
668 | ||
669 | return p; | |
670 | } | |
671 | ||
672 | static int f_show(struct seq_file *m, void *v) | |
673 | { | |
674 | struct ftrace_event_call *call = m->private; | |
675 | struct ftrace_event_field *field; | |
676 | const char *array_descriptor; | |
677 | ||
678 | switch ((unsigned long)v) { | |
679 | case FORMAT_HEADER: | |
680 | seq_printf(m, "name: %s\n", call->name); | |
681 | seq_printf(m, "ID: %d\n", call->event.type); | |
682 | seq_printf(m, "format:\n"); | |
8728fe50 | 683 | return 0; |
5a65e956 | 684 | |
86397dc3 LZ |
685 | case FORMAT_FIELD_SEPERATOR: |
686 | seq_putc(m, '\n'); | |
687 | return 0; | |
688 | ||
2a37a3df SR |
689 | case FORMAT_PRINTFMT: |
690 | seq_printf(m, "\nprint fmt: %s\n", | |
691 | call->print_fmt); | |
692 | return 0; | |
981d081e | 693 | } |
8728fe50 | 694 | |
2a37a3df | 695 | field = v; |
8728fe50 | 696 | |
2a37a3df SR |
697 | /* |
698 | * Smartly shows the array type(except dynamic array). | |
699 | * Normal: | |
700 | * field:TYPE VAR | |
701 | * If TYPE := TYPE[LEN], it is shown: | |
702 | * field:TYPE VAR[LEN] | |
703 | */ | |
704 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 705 | |
2a37a3df SR |
706 | if (!strncmp(field->type, "__data_loc", 10)) |
707 | array_descriptor = NULL; | |
8728fe50 | 708 | |
2a37a3df SR |
709 | if (!array_descriptor) |
710 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
711 | field->type, field->name, field->offset, | |
712 | field->size, !!field->is_signed); | |
713 | else | |
714 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
715 | (int)(array_descriptor - field->type), | |
716 | field->type, field->name, | |
717 | array_descriptor, field->offset, | |
718 | field->size, !!field->is_signed); | |
8728fe50 | 719 | |
2a37a3df SR |
720 | return 0; |
721 | } | |
5a65e956 | 722 | |
2a37a3df SR |
723 | static void f_stop(struct seq_file *m, void *p) |
724 | { | |
725 | } | |
981d081e | 726 | |
2a37a3df SR |
727 | static const struct seq_operations trace_format_seq_ops = { |
728 | .start = f_start, | |
729 | .next = f_next, | |
730 | .stop = f_stop, | |
731 | .show = f_show, | |
732 | }; | |
733 | ||
734 | static int trace_format_open(struct inode *inode, struct file *file) | |
735 | { | |
736 | struct ftrace_event_call *call = inode->i_private; | |
737 | struct seq_file *m; | |
738 | int ret; | |
739 | ||
740 | ret = seq_open(file, &trace_format_seq_ops); | |
741 | if (ret < 0) | |
742 | return ret; | |
743 | ||
744 | m = file->private_data; | |
745 | m->private = call; | |
746 | ||
747 | return 0; | |
981d081e SR |
748 | } |
749 | ||
23725aee PZ |
750 | static ssize_t |
751 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
752 | { | |
753 | struct ftrace_event_call *call = filp->private_data; | |
754 | struct trace_seq *s; | |
755 | int r; | |
756 | ||
757 | if (*ppos) | |
758 | return 0; | |
759 | ||
760 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
761 | if (!s) | |
762 | return -ENOMEM; | |
763 | ||
764 | trace_seq_init(s); | |
32c0edae | 765 | trace_seq_printf(s, "%d\n", call->event.type); |
23725aee PZ |
766 | |
767 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
768 | s->buffer, s->len); | |
769 | kfree(s); | |
770 | return r; | |
771 | } | |
772 | ||
7ce7e424 TZ |
773 | static ssize_t |
774 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
775 | loff_t *ppos) | |
776 | { | |
777 | struct ftrace_event_call *call = filp->private_data; | |
778 | struct trace_seq *s; | |
779 | int r; | |
780 | ||
781 | if (*ppos) | |
782 | return 0; | |
783 | ||
784 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
785 | if (!s) | |
786 | return -ENOMEM; | |
787 | ||
788 | trace_seq_init(s); | |
789 | ||
8b372562 | 790 | print_event_filter(call, s); |
4bda2d51 | 791 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
792 | |
793 | kfree(s); | |
794 | ||
795 | return r; | |
796 | } | |
797 | ||
798 | static ssize_t | |
799 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
800 | loff_t *ppos) | |
801 | { | |
802 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 803 | char *buf; |
7ce7e424 TZ |
804 | int err; |
805 | ||
8b372562 | 806 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
807 | return -EINVAL; |
808 | ||
8b372562 TZ |
809 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
810 | if (!buf) | |
7ce7e424 TZ |
811 | return -ENOMEM; |
812 | ||
8b372562 TZ |
813 | if (copy_from_user(buf, ubuf, cnt)) { |
814 | free_page((unsigned long) buf); | |
815 | return -EFAULT; | |
7ce7e424 | 816 | } |
8b372562 | 817 | buf[cnt] = '\0'; |
7ce7e424 | 818 | |
8b372562 TZ |
819 | err = apply_event_filter(call, buf); |
820 | free_page((unsigned long) buf); | |
821 | if (err < 0) | |
44e9c8b7 | 822 | return err; |
0a19e53c | 823 | |
7ce7e424 TZ |
824 | *ppos += cnt; |
825 | ||
826 | return cnt; | |
827 | } | |
828 | ||
cfb180f3 TZ |
829 | static ssize_t |
830 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
831 | loff_t *ppos) | |
832 | { | |
833 | struct event_subsystem *system = filp->private_data; | |
834 | struct trace_seq *s; | |
835 | int r; | |
836 | ||
837 | if (*ppos) | |
838 | return 0; | |
839 | ||
840 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
841 | if (!s) | |
842 | return -ENOMEM; | |
843 | ||
844 | trace_seq_init(s); | |
845 | ||
8b372562 | 846 | print_subsystem_event_filter(system, s); |
4bda2d51 | 847 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
848 | |
849 | kfree(s); | |
850 | ||
851 | return r; | |
852 | } | |
853 | ||
854 | static ssize_t | |
855 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
856 | loff_t *ppos) | |
857 | { | |
858 | struct event_subsystem *system = filp->private_data; | |
8b372562 | 859 | char *buf; |
cfb180f3 TZ |
860 | int err; |
861 | ||
8b372562 | 862 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
863 | return -EINVAL; |
864 | ||
8b372562 TZ |
865 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
866 | if (!buf) | |
cfb180f3 TZ |
867 | return -ENOMEM; |
868 | ||
8b372562 TZ |
869 | if (copy_from_user(buf, ubuf, cnt)) { |
870 | free_page((unsigned long) buf); | |
871 | return -EFAULT; | |
cfb180f3 | 872 | } |
8b372562 | 873 | buf[cnt] = '\0'; |
cfb180f3 | 874 | |
8b372562 TZ |
875 | err = apply_subsystem_event_filter(system, buf); |
876 | free_page((unsigned long) buf); | |
877 | if (err < 0) | |
44e9c8b7 | 878 | return err; |
cfb180f3 TZ |
879 | |
880 | *ppos += cnt; | |
881 | ||
882 | return cnt; | |
883 | } | |
884 | ||
d1b182a8 SR |
885 | static ssize_t |
886 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
887 | { | |
888 | int (*func)(struct trace_seq *s) = filp->private_data; | |
889 | struct trace_seq *s; | |
890 | int r; | |
891 | ||
892 | if (*ppos) | |
893 | return 0; | |
894 | ||
895 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
896 | if (!s) | |
897 | return -ENOMEM; | |
898 | ||
899 | trace_seq_init(s); | |
900 | ||
901 | func(s); | |
902 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
903 | ||
904 | kfree(s); | |
905 | ||
906 | return r; | |
907 | } | |
908 | ||
b77e38aa SR |
909 | static const struct seq_operations show_event_seq_ops = { |
910 | .start = t_start, | |
911 | .next = t_next, | |
912 | .show = t_show, | |
913 | .stop = t_stop, | |
914 | }; | |
915 | ||
916 | static const struct seq_operations show_set_event_seq_ops = { | |
917 | .start = s_start, | |
918 | .next = s_next, | |
919 | .show = t_show, | |
920 | .stop = t_stop, | |
921 | }; | |
922 | ||
2314c4ae SR |
923 | static const struct file_operations ftrace_avail_fops = { |
924 | .open = ftrace_event_seq_open, | |
925 | .read = seq_read, | |
926 | .llseek = seq_lseek, | |
927 | .release = seq_release, | |
928 | }; | |
929 | ||
b77e38aa SR |
930 | static const struct file_operations ftrace_set_event_fops = { |
931 | .open = ftrace_event_seq_open, | |
932 | .read = seq_read, | |
933 | .write = ftrace_event_write, | |
934 | .llseek = seq_lseek, | |
935 | .release = seq_release, | |
936 | }; | |
937 | ||
1473e441 SR |
938 | static const struct file_operations ftrace_enable_fops = { |
939 | .open = tracing_open_generic, | |
940 | .read = event_enable_read, | |
941 | .write = event_enable_write, | |
6038f373 | 942 | .llseek = default_llseek, |
1473e441 SR |
943 | }; |
944 | ||
981d081e | 945 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
946 | .open = trace_format_open, |
947 | .read = seq_read, | |
948 | .llseek = seq_lseek, | |
949 | .release = seq_release, | |
981d081e SR |
950 | }; |
951 | ||
23725aee PZ |
952 | static const struct file_operations ftrace_event_id_fops = { |
953 | .open = tracing_open_generic, | |
954 | .read = event_id_read, | |
6038f373 | 955 | .llseek = default_llseek, |
23725aee PZ |
956 | }; |
957 | ||
7ce7e424 TZ |
958 | static const struct file_operations ftrace_event_filter_fops = { |
959 | .open = tracing_open_generic, | |
960 | .read = event_filter_read, | |
961 | .write = event_filter_write, | |
6038f373 | 962 | .llseek = default_llseek, |
7ce7e424 TZ |
963 | }; |
964 | ||
cfb180f3 TZ |
965 | static const struct file_operations ftrace_subsystem_filter_fops = { |
966 | .open = tracing_open_generic, | |
967 | .read = subsystem_filter_read, | |
968 | .write = subsystem_filter_write, | |
6038f373 | 969 | .llseek = default_llseek, |
cfb180f3 TZ |
970 | }; |
971 | ||
8ae79a13 SR |
972 | static const struct file_operations ftrace_system_enable_fops = { |
973 | .open = tracing_open_generic, | |
974 | .read = system_enable_read, | |
975 | .write = system_enable_write, | |
6038f373 | 976 | .llseek = default_llseek, |
8ae79a13 SR |
977 | }; |
978 | ||
d1b182a8 SR |
979 | static const struct file_operations ftrace_show_header_fops = { |
980 | .open = tracing_open_generic, | |
981 | .read = show_header, | |
6038f373 | 982 | .llseek = default_llseek, |
d1b182a8 SR |
983 | }; |
984 | ||
1473e441 SR |
985 | static struct dentry *event_trace_events_dir(void) |
986 | { | |
987 | static struct dentry *d_tracer; | |
988 | static struct dentry *d_events; | |
989 | ||
990 | if (d_events) | |
991 | return d_events; | |
992 | ||
993 | d_tracer = tracing_init_dentry(); | |
994 | if (!d_tracer) | |
995 | return NULL; | |
996 | ||
997 | d_events = debugfs_create_dir("events", d_tracer); | |
998 | if (!d_events) | |
999 | pr_warning("Could not create debugfs " | |
1000 | "'events' directory\n"); | |
1001 | ||
1002 | return d_events; | |
1003 | } | |
1004 | ||
6ecc2d1c SR |
1005 | static LIST_HEAD(event_subsystems); |
1006 | ||
1007 | static struct dentry * | |
1008 | event_subsystem_dir(const char *name, struct dentry *d_events) | |
1009 | { | |
1010 | struct event_subsystem *system; | |
e1112b4d | 1011 | struct dentry *entry; |
6ecc2d1c SR |
1012 | |
1013 | /* First see if we did not already create this dir */ | |
1014 | list_for_each_entry(system, &event_subsystems, list) { | |
dc82ec98 XG |
1015 | if (strcmp(system->name, name) == 0) { |
1016 | system->nr_events++; | |
6ecc2d1c | 1017 | return system->entry; |
dc82ec98 | 1018 | } |
6ecc2d1c SR |
1019 | } |
1020 | ||
1021 | /* need to create new entry */ | |
1022 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1023 | if (!system) { | |
1024 | pr_warning("No memory to create event subsystem %s\n", | |
1025 | name); | |
1026 | return d_events; | |
1027 | } | |
1028 | ||
1029 | system->entry = debugfs_create_dir(name, d_events); | |
1030 | if (!system->entry) { | |
1031 | pr_warning("Could not create event subsystem %s\n", | |
1032 | name); | |
1033 | kfree(system); | |
1034 | return d_events; | |
1035 | } | |
1036 | ||
dc82ec98 | 1037 | system->nr_events = 1; |
6d723736 SR |
1038 | system->name = kstrdup(name, GFP_KERNEL); |
1039 | if (!system->name) { | |
1040 | debugfs_remove(system->entry); | |
1041 | kfree(system); | |
1042 | return d_events; | |
1043 | } | |
1044 | ||
6ecc2d1c SR |
1045 | list_add(&system->list, &event_subsystems); |
1046 | ||
30e673b2 | 1047 | system->filter = NULL; |
cfb180f3 | 1048 | |
8b372562 TZ |
1049 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
1050 | if (!system->filter) { | |
1051 | pr_warning("Could not allocate filter for subsystem " | |
1052 | "'%s'\n", name); | |
1053 | return system->entry; | |
1054 | } | |
1055 | ||
e1112b4d TZ |
1056 | entry = debugfs_create_file("filter", 0644, system->entry, system, |
1057 | &ftrace_subsystem_filter_fops); | |
8b372562 TZ |
1058 | if (!entry) { |
1059 | kfree(system->filter); | |
1060 | system->filter = NULL; | |
e1112b4d TZ |
1061 | pr_warning("Could not create debugfs " |
1062 | "'%s/filter' entry\n", name); | |
8b372562 | 1063 | } |
e1112b4d | 1064 | |
f3f3f009 FW |
1065 | trace_create_file("enable", 0644, system->entry, |
1066 | (void *)system->name, | |
1067 | &ftrace_system_enable_fops); | |
8ae79a13 | 1068 | |
6ecc2d1c SR |
1069 | return system->entry; |
1070 | } | |
1071 | ||
1473e441 | 1072 | static int |
701970b3 SR |
1073 | event_create_dir(struct ftrace_event_call *call, struct dentry *d_events, |
1074 | const struct file_operations *id, | |
1075 | const struct file_operations *enable, | |
1076 | const struct file_operations *filter, | |
1077 | const struct file_operations *format) | |
1473e441 | 1078 | { |
2e33af02 | 1079 | struct list_head *head; |
fd994989 | 1080 | int ret; |
1473e441 | 1081 | |
6ecc2d1c SR |
1082 | /* |
1083 | * If the trace point header did not define TRACE_SYSTEM | |
1084 | * then the system would be called "TRACE_SYSTEM". | |
1085 | */ | |
8f082018 SR |
1086 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
1087 | d_events = event_subsystem_dir(call->class->system, d_events); | |
6ecc2d1c | 1088 | |
1473e441 SR |
1089 | call->dir = debugfs_create_dir(call->name, d_events); |
1090 | if (!call->dir) { | |
1091 | pr_warning("Could not create debugfs " | |
1092 | "'%s' directory\n", call->name); | |
1093 | return -1; | |
1094 | } | |
1095 | ||
a1d0ce82 | 1096 | if (call->class->reg) |
f3f3f009 FW |
1097 | trace_create_file("enable", 0644, call->dir, call, |
1098 | enable); | |
1473e441 | 1099 | |
2239291a | 1100 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 1101 | if (call->event.type && call->class->reg) |
f3f3f009 FW |
1102 | trace_create_file("id", 0444, call->dir, call, |
1103 | id); | |
2239291a | 1104 | #endif |
23725aee | 1105 | |
c9d932cf LZ |
1106 | /* |
1107 | * Other events may have the same class. Only update | |
1108 | * the fields if they are not already defined. | |
1109 | */ | |
1110 | head = trace_get_fields(call); | |
1111 | if (list_empty(head)) { | |
1112 | ret = call->class->define_fields(call); | |
1113 | if (ret < 0) { | |
1114 | pr_warning("Could not initialize trace point" | |
1115 | " events/%s\n", call->name); | |
1116 | return ret; | |
cf027f64 TZ |
1117 | } |
1118 | } | |
c9d932cf LZ |
1119 | trace_create_file("filter", 0644, call->dir, call, |
1120 | filter); | |
cf027f64 | 1121 | |
f3f3f009 FW |
1122 | trace_create_file("format", 0444, call->dir, call, |
1123 | format); | |
6d723736 SR |
1124 | |
1125 | return 0; | |
1126 | } | |
1127 | ||
67ead0a6 LZ |
1128 | static int |
1129 | __trace_add_event_call(struct ftrace_event_call *call, struct module *mod, | |
1130 | const struct file_operations *id, | |
1131 | const struct file_operations *enable, | |
1132 | const struct file_operations *filter, | |
1133 | const struct file_operations *format) | |
bd1a5c84 MH |
1134 | { |
1135 | struct dentry *d_events; | |
1136 | int ret; | |
6d723736 | 1137 | |
67ead0a6 | 1138 | /* The linker may leave blanks */ |
bd1a5c84 MH |
1139 | if (!call->name) |
1140 | return -EINVAL; | |
701970b3 | 1141 | |
0405ab80 SR |
1142 | if (call->class->raw_init) { |
1143 | ret = call->class->raw_init(call); | |
bd1a5c84 MH |
1144 | if (ret < 0) { |
1145 | if (ret != -ENOSYS) | |
67ead0a6 LZ |
1146 | pr_warning("Could not initialize trace events/%s\n", |
1147 | call->name); | |
bd1a5c84 MH |
1148 | return ret; |
1149 | } | |
1150 | } | |
701970b3 | 1151 | |
bd1a5c84 MH |
1152 | d_events = event_trace_events_dir(); |
1153 | if (!d_events) | |
1154 | return -ENOENT; | |
1155 | ||
67ead0a6 | 1156 | ret = event_create_dir(call, d_events, id, enable, filter, format); |
88f70d75 MH |
1157 | if (!ret) |
1158 | list_add(&call->list, &ftrace_events); | |
67ead0a6 | 1159 | call->mod = mod; |
88f70d75 | 1160 | |
588bebb7 | 1161 | return ret; |
bd1a5c84 MH |
1162 | } |
1163 | ||
1164 | /* Add an additional event_call dynamically */ | |
1165 | int trace_add_event_call(struct ftrace_event_call *call) | |
1166 | { | |
1167 | int ret; | |
1168 | mutex_lock(&event_mutex); | |
67ead0a6 LZ |
1169 | ret = __trace_add_event_call(call, NULL, &ftrace_event_id_fops, |
1170 | &ftrace_enable_fops, | |
1171 | &ftrace_event_filter_fops, | |
1172 | &ftrace_event_format_fops); | |
bd1a5c84 MH |
1173 | mutex_unlock(&event_mutex); |
1174 | return ret; | |
1175 | } | |
701970b3 | 1176 | |
a2ca5e03 FW |
1177 | static void remove_subsystem_dir(const char *name) |
1178 | { | |
1179 | struct event_subsystem *system; | |
1180 | ||
1181 | if (strcmp(name, TRACE_SYSTEM) == 0) | |
1182 | return; | |
1183 | ||
1184 | list_for_each_entry(system, &event_subsystems, list) { | |
1185 | if (strcmp(system->name, name) == 0) { | |
1186 | if (!--system->nr_events) { | |
1187 | struct event_filter *filter = system->filter; | |
1188 | ||
1189 | debugfs_remove_recursive(system->entry); | |
1190 | list_del(&system->list); | |
1191 | if (filter) { | |
1192 | kfree(filter->filter_string); | |
1193 | kfree(filter); | |
1194 | } | |
1195 | kfree(system->name); | |
1196 | kfree(system); | |
1197 | } | |
1198 | break; | |
1199 | } | |
1200 | } | |
1201 | } | |
1202 | ||
4fead8e4 MH |
1203 | /* |
1204 | * Must be called under locking both of event_mutex and trace_event_mutex. | |
1205 | */ | |
bd1a5c84 MH |
1206 | static void __trace_remove_event_call(struct ftrace_event_call *call) |
1207 | { | |
1208 | ftrace_event_enable_disable(call, 0); | |
80decc70 SR |
1209 | if (call->event.funcs) |
1210 | __unregister_ftrace_event(&call->event); | |
bd1a5c84 MH |
1211 | debugfs_remove_recursive(call->dir); |
1212 | list_del(&call->list); | |
1213 | trace_destroy_fields(call); | |
1214 | destroy_preds(call); | |
8f082018 | 1215 | remove_subsystem_dir(call->class->system); |
bd1a5c84 MH |
1216 | } |
1217 | ||
1218 | /* Remove an event_call */ | |
1219 | void trace_remove_event_call(struct ftrace_event_call *call) | |
1220 | { | |
1221 | mutex_lock(&event_mutex); | |
4fead8e4 | 1222 | down_write(&trace_event_mutex); |
bd1a5c84 | 1223 | __trace_remove_event_call(call); |
4fead8e4 | 1224 | up_write(&trace_event_mutex); |
bd1a5c84 MH |
1225 | mutex_unlock(&event_mutex); |
1226 | } | |
1227 | ||
1228 | #define for_each_event(event, start, end) \ | |
1229 | for (event = start; \ | |
1230 | (unsigned long)event < (unsigned long)end; \ | |
1231 | event++) | |
1232 | ||
1233 | #ifdef CONFIG_MODULES | |
1234 | ||
1235 | static LIST_HEAD(ftrace_module_file_list); | |
1236 | ||
1237 | /* | |
1238 | * Modules must own their file_operations to keep up with | |
1239 | * reference counting. | |
1240 | */ | |
1241 | struct ftrace_module_file_ops { | |
1242 | struct list_head list; | |
1243 | struct module *mod; | |
1244 | struct file_operations id; | |
1245 | struct file_operations enable; | |
1246 | struct file_operations format; | |
1247 | struct file_operations filter; | |
1248 | }; | |
1249 | ||
701970b3 SR |
1250 | static struct ftrace_module_file_ops * |
1251 | trace_create_file_ops(struct module *mod) | |
1252 | { | |
1253 | struct ftrace_module_file_ops *file_ops; | |
1254 | ||
1255 | /* | |
1256 | * This is a bit of a PITA. To allow for correct reference | |
1257 | * counting, modules must "own" their file_operations. | |
1258 | * To do this, we allocate the file operations that will be | |
1259 | * used in the event directory. | |
1260 | */ | |
1261 | ||
1262 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1263 | if (!file_ops) | |
1264 | return NULL; | |
1265 | ||
1266 | file_ops->mod = mod; | |
1267 | ||
1268 | file_ops->id = ftrace_event_id_fops; | |
1269 | file_ops->id.owner = mod; | |
1270 | ||
1271 | file_ops->enable = ftrace_enable_fops; | |
1272 | file_ops->enable.owner = mod; | |
1273 | ||
1274 | file_ops->filter = ftrace_event_filter_fops; | |
1275 | file_ops->filter.owner = mod; | |
1276 | ||
1277 | file_ops->format = ftrace_event_format_fops; | |
1278 | file_ops->format.owner = mod; | |
1279 | ||
1280 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1281 | ||
1282 | return file_ops; | |
1283 | } | |
1284 | ||
6d723736 SR |
1285 | static void trace_module_add_events(struct module *mod) |
1286 | { | |
701970b3 | 1287 | struct ftrace_module_file_ops *file_ops = NULL; |
e4a9ea5e | 1288 | struct ftrace_event_call **call, **start, **end; |
6d723736 SR |
1289 | |
1290 | start = mod->trace_events; | |
1291 | end = mod->trace_events + mod->num_trace_events; | |
1292 | ||
1293 | if (start == end) | |
1294 | return; | |
1295 | ||
67ead0a6 LZ |
1296 | file_ops = trace_create_file_ops(mod); |
1297 | if (!file_ops) | |
6d723736 SR |
1298 | return; |
1299 | ||
1300 | for_each_event(call, start, end) { | |
e4a9ea5e | 1301 | __trace_add_event_call(*call, mod, |
88f70d75 MH |
1302 | &file_ops->id, &file_ops->enable, |
1303 | &file_ops->filter, &file_ops->format); | |
6d723736 SR |
1304 | } |
1305 | } | |
1306 | ||
1307 | static void trace_module_remove_events(struct module *mod) | |
1308 | { | |
701970b3 | 1309 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1310 | struct ftrace_event_call *call, *p; |
9456f0fa | 1311 | bool found = false; |
6d723736 | 1312 | |
110bf2b7 | 1313 | down_write(&trace_event_mutex); |
6d723736 SR |
1314 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1315 | if (call->mod == mod) { | |
9456f0fa | 1316 | found = true; |
bd1a5c84 | 1317 | __trace_remove_event_call(call); |
6d723736 SR |
1318 | } |
1319 | } | |
701970b3 SR |
1320 | |
1321 | /* Now free the file_operations */ | |
1322 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1323 | if (file_ops->mod == mod) | |
1324 | break; | |
1325 | } | |
1326 | if (&file_ops->list != &ftrace_module_file_list) { | |
1327 | list_del(&file_ops->list); | |
1328 | kfree(file_ops); | |
1329 | } | |
9456f0fa SR |
1330 | |
1331 | /* | |
1332 | * It is safest to reset the ring buffer if the module being unloaded | |
1333 | * registered any events. | |
1334 | */ | |
1335 | if (found) | |
1336 | tracing_reset_current_online_cpus(); | |
110bf2b7 | 1337 | up_write(&trace_event_mutex); |
6d723736 SR |
1338 | } |
1339 | ||
61f919a1 SR |
1340 | static int trace_module_notify(struct notifier_block *self, |
1341 | unsigned long val, void *data) | |
6d723736 SR |
1342 | { |
1343 | struct module *mod = data; | |
1344 | ||
1345 | mutex_lock(&event_mutex); | |
1346 | switch (val) { | |
1347 | case MODULE_STATE_COMING: | |
1348 | trace_module_add_events(mod); | |
1349 | break; | |
1350 | case MODULE_STATE_GOING: | |
1351 | trace_module_remove_events(mod); | |
1352 | break; | |
1353 | } | |
1354 | mutex_unlock(&event_mutex); | |
fd994989 | 1355 | |
1473e441 SR |
1356 | return 0; |
1357 | } | |
61f919a1 SR |
1358 | #else |
1359 | static int trace_module_notify(struct notifier_block *self, | |
1360 | unsigned long val, void *data) | |
1361 | { | |
1362 | return 0; | |
1363 | } | |
1364 | #endif /* CONFIG_MODULES */ | |
1473e441 | 1365 | |
ec827c7e | 1366 | static struct notifier_block trace_module_nb = { |
6d723736 SR |
1367 | .notifier_call = trace_module_notify, |
1368 | .priority = 0, | |
1369 | }; | |
1370 | ||
e4a9ea5e SR |
1371 | extern struct ftrace_event_call *__start_ftrace_events[]; |
1372 | extern struct ftrace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 1373 | |
020e5f85 LZ |
1374 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
1375 | ||
1376 | static __init int setup_trace_event(char *str) | |
1377 | { | |
1378 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
1379 | ring_buffer_expanded = 1; | |
1380 | tracing_selftest_disabled = 1; | |
1381 | ||
1382 | return 1; | |
1383 | } | |
1384 | __setup("trace_event=", setup_trace_event); | |
1385 | ||
b77e38aa SR |
1386 | static __init int event_trace_init(void) |
1387 | { | |
e4a9ea5e | 1388 | struct ftrace_event_call **call; |
b77e38aa SR |
1389 | struct dentry *d_tracer; |
1390 | struct dentry *entry; | |
1473e441 | 1391 | struct dentry *d_events; |
6d723736 | 1392 | int ret; |
020e5f85 LZ |
1393 | char *buf = bootup_event_buf; |
1394 | char *token; | |
b77e38aa SR |
1395 | |
1396 | d_tracer = tracing_init_dentry(); | |
1397 | if (!d_tracer) | |
1398 | return 0; | |
1399 | ||
2314c4ae SR |
1400 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
1401 | (void *)&show_event_seq_ops, | |
1402 | &ftrace_avail_fops); | |
1403 | if (!entry) | |
1404 | pr_warning("Could not create debugfs " | |
1405 | "'available_events' entry\n"); | |
1406 | ||
b77e38aa SR |
1407 | entry = debugfs_create_file("set_event", 0644, d_tracer, |
1408 | (void *)&show_set_event_seq_ops, | |
1409 | &ftrace_set_event_fops); | |
1410 | if (!entry) | |
1411 | pr_warning("Could not create debugfs " | |
1412 | "'set_event' entry\n"); | |
1413 | ||
1473e441 SR |
1414 | d_events = event_trace_events_dir(); |
1415 | if (!d_events) | |
1416 | return 0; | |
1417 | ||
d1b182a8 SR |
1418 | /* ring buffer internal formats */ |
1419 | trace_create_file("header_page", 0444, d_events, | |
1420 | ring_buffer_print_page_header, | |
1421 | &ftrace_show_header_fops); | |
1422 | ||
1423 | trace_create_file("header_event", 0444, d_events, | |
1424 | ring_buffer_print_entry_header, | |
1425 | &ftrace_show_header_fops); | |
1426 | ||
8ae79a13 | 1427 | trace_create_file("enable", 0644, d_events, |
8f31bfe5 | 1428 | NULL, &ftrace_system_enable_fops); |
8ae79a13 | 1429 | |
8728fe50 LZ |
1430 | if (trace_define_common_fields()) |
1431 | pr_warning("tracing: Failed to allocate common fields"); | |
1432 | ||
6d723736 | 1433 | for_each_event(call, __start_ftrace_events, __stop_ftrace_events) { |
e4a9ea5e | 1434 | __trace_add_event_call(*call, NULL, &ftrace_event_id_fops, |
88f70d75 MH |
1435 | &ftrace_enable_fops, |
1436 | &ftrace_event_filter_fops, | |
1437 | &ftrace_event_format_fops); | |
1473e441 SR |
1438 | } |
1439 | ||
020e5f85 LZ |
1440 | while (true) { |
1441 | token = strsep(&buf, ","); | |
1442 | ||
1443 | if (!token) | |
1444 | break; | |
1445 | if (!*token) | |
1446 | continue; | |
1447 | ||
1448 | ret = ftrace_set_clr_event(token, 1); | |
1449 | if (ret) | |
1450 | pr_warning("Failed to enable trace event: %s\n", token); | |
1451 | } | |
1452 | ||
6d723736 | 1453 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 1454 | if (ret) |
6d723736 SR |
1455 | pr_warning("Failed to register trace events module notifier\n"); |
1456 | ||
b77e38aa SR |
1457 | return 0; |
1458 | } | |
1459 | fs_initcall(event_trace_init); | |
e6187007 SR |
1460 | |
1461 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1462 | ||
1463 | static DEFINE_SPINLOCK(test_spinlock); | |
1464 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
1465 | static DEFINE_MUTEX(test_mutex); | |
1466 | ||
1467 | static __init void test_work(struct work_struct *dummy) | |
1468 | { | |
1469 | spin_lock(&test_spinlock); | |
1470 | spin_lock_irq(&test_spinlock_irq); | |
1471 | udelay(1); | |
1472 | spin_unlock_irq(&test_spinlock_irq); | |
1473 | spin_unlock(&test_spinlock); | |
1474 | ||
1475 | mutex_lock(&test_mutex); | |
1476 | msleep(1); | |
1477 | mutex_unlock(&test_mutex); | |
1478 | } | |
1479 | ||
1480 | static __init int event_test_thread(void *unused) | |
1481 | { | |
1482 | void *test_malloc; | |
1483 | ||
1484 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
1485 | if (!test_malloc) | |
1486 | pr_info("failed to kmalloc\n"); | |
1487 | ||
1488 | schedule_on_each_cpu(test_work); | |
1489 | ||
1490 | kfree(test_malloc); | |
1491 | ||
1492 | set_current_state(TASK_INTERRUPTIBLE); | |
1493 | while (!kthread_should_stop()) | |
1494 | schedule(); | |
1495 | ||
1496 | return 0; | |
1497 | } | |
1498 | ||
1499 | /* | |
1500 | * Do various things that may trigger events. | |
1501 | */ | |
1502 | static __init void event_test_stuff(void) | |
1503 | { | |
1504 | struct task_struct *test_thread; | |
1505 | ||
1506 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
1507 | msleep(1); | |
1508 | kthread_stop(test_thread); | |
1509 | } | |
1510 | ||
1511 | /* | |
1512 | * For every trace event defined, we will test each trace point separately, | |
1513 | * and then by groups, and finally all trace points. | |
1514 | */ | |
9ea21c1e | 1515 | static __init void event_trace_self_tests(void) |
e6187007 SR |
1516 | { |
1517 | struct ftrace_event_call *call; | |
1518 | struct event_subsystem *system; | |
e6187007 SR |
1519 | int ret; |
1520 | ||
1521 | pr_info("Running tests on trace events:\n"); | |
1522 | ||
1523 | list_for_each_entry(call, &ftrace_events, list) { | |
1524 | ||
2239291a SR |
1525 | /* Only test those that have a probe */ |
1526 | if (!call->class || !call->class->probe) | |
e6187007 SR |
1527 | continue; |
1528 | ||
1f5a6b45 SR |
1529 | /* |
1530 | * Testing syscall events here is pretty useless, but | |
1531 | * we still do it if configured. But this is time consuming. | |
1532 | * What we really need is a user thread to perform the | |
1533 | * syscalls as we test. | |
1534 | */ | |
1535 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
1536 | if (call->class->system && |
1537 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
1538 | continue; |
1539 | #endif | |
1540 | ||
e6187007 SR |
1541 | pr_info("Testing event %s: ", call->name); |
1542 | ||
1543 | /* | |
1544 | * If an event is already enabled, someone is using | |
1545 | * it and the self test should not be on. | |
1546 | */ | |
553552ce | 1547 | if (call->flags & TRACE_EVENT_FL_ENABLED) { |
e6187007 SR |
1548 | pr_warning("Enabled event during self test!\n"); |
1549 | WARN_ON_ONCE(1); | |
1550 | continue; | |
1551 | } | |
1552 | ||
0e907c99 | 1553 | ftrace_event_enable_disable(call, 1); |
e6187007 | 1554 | event_test_stuff(); |
0e907c99 | 1555 | ftrace_event_enable_disable(call, 0); |
e6187007 SR |
1556 | |
1557 | pr_cont("OK\n"); | |
1558 | } | |
1559 | ||
1560 | /* Now test at the sub system level */ | |
1561 | ||
1562 | pr_info("Running tests on trace event systems:\n"); | |
1563 | ||
1564 | list_for_each_entry(system, &event_subsystems, list) { | |
1565 | ||
1566 | /* the ftrace system is special, skip it */ | |
1567 | if (strcmp(system->name, "ftrace") == 0) | |
1568 | continue; | |
1569 | ||
1570 | pr_info("Testing event system %s: ", system->name); | |
1571 | ||
8f31bfe5 | 1572 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1); |
e6187007 SR |
1573 | if (WARN_ON_ONCE(ret)) { |
1574 | pr_warning("error enabling system %s\n", | |
1575 | system->name); | |
1576 | continue; | |
1577 | } | |
1578 | ||
1579 | event_test_stuff(); | |
1580 | ||
8f31bfe5 | 1581 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0); |
e6187007 SR |
1582 | if (WARN_ON_ONCE(ret)) |
1583 | pr_warning("error disabling system %s\n", | |
1584 | system->name); | |
1585 | ||
1586 | pr_cont("OK\n"); | |
1587 | } | |
1588 | ||
1589 | /* Test with all events enabled */ | |
1590 | ||
1591 | pr_info("Running tests on all trace events:\n"); | |
1592 | pr_info("Testing all events: "); | |
1593 | ||
8f31bfe5 | 1594 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1); |
e6187007 | 1595 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 1596 | pr_warning("error enabling all events\n"); |
9ea21c1e | 1597 | return; |
e6187007 SR |
1598 | } |
1599 | ||
1600 | event_test_stuff(); | |
1601 | ||
1602 | /* reset sysname */ | |
8f31bfe5 | 1603 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0); |
e6187007 SR |
1604 | if (WARN_ON_ONCE(ret)) { |
1605 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 1606 | return; |
e6187007 SR |
1607 | } |
1608 | ||
1609 | pr_cont("OK\n"); | |
9ea21c1e SR |
1610 | } |
1611 | ||
1612 | #ifdef CONFIG_FUNCTION_TRACER | |
1613 | ||
245b2e70 | 1614 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e SR |
1615 | |
1616 | static void | |
1617 | function_test_events_call(unsigned long ip, unsigned long parent_ip) | |
1618 | { | |
1619 | struct ring_buffer_event *event; | |
e77405ad | 1620 | struct ring_buffer *buffer; |
9ea21c1e SR |
1621 | struct ftrace_entry *entry; |
1622 | unsigned long flags; | |
1623 | long disabled; | |
9ea21c1e SR |
1624 | int cpu; |
1625 | int pc; | |
1626 | ||
1627 | pc = preempt_count(); | |
5168ae50 | 1628 | preempt_disable_notrace(); |
9ea21c1e | 1629 | cpu = raw_smp_processor_id(); |
245b2e70 | 1630 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
1631 | |
1632 | if (disabled != 1) | |
1633 | goto out; | |
1634 | ||
1635 | local_save_flags(flags); | |
1636 | ||
e77405ad SR |
1637 | event = trace_current_buffer_lock_reserve(&buffer, |
1638 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
1639 | flags, pc); |
1640 | if (!event) | |
1641 | goto out; | |
1642 | entry = ring_buffer_event_data(event); | |
1643 | entry->ip = ip; | |
1644 | entry->parent_ip = parent_ip; | |
1645 | ||
e77405ad | 1646 | trace_nowake_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
1647 | |
1648 | out: | |
245b2e70 | 1649 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 1650 | preempt_enable_notrace(); |
9ea21c1e SR |
1651 | } |
1652 | ||
1653 | static struct ftrace_ops trace_ops __initdata = | |
1654 | { | |
1655 | .func = function_test_events_call, | |
1656 | }; | |
1657 | ||
1658 | static __init void event_trace_self_test_with_function(void) | |
1659 | { | |
17bb615a SR |
1660 | int ret; |
1661 | ret = register_ftrace_function(&trace_ops); | |
1662 | if (WARN_ON(ret < 0)) { | |
1663 | pr_info("Failed to enable function tracer for event tests\n"); | |
1664 | return; | |
1665 | } | |
9ea21c1e SR |
1666 | pr_info("Running tests again, along with the function tracer\n"); |
1667 | event_trace_self_tests(); | |
1668 | unregister_ftrace_function(&trace_ops); | |
1669 | } | |
1670 | #else | |
1671 | static __init void event_trace_self_test_with_function(void) | |
1672 | { | |
1673 | } | |
1674 | #endif | |
1675 | ||
1676 | static __init int event_trace_self_tests_init(void) | |
1677 | { | |
020e5f85 LZ |
1678 | if (!tracing_selftest_disabled) { |
1679 | event_trace_self_tests(); | |
1680 | event_trace_self_test_with_function(); | |
1681 | } | |
e6187007 SR |
1682 | |
1683 | return 0; | |
1684 | } | |
1685 | ||
28d20e2d | 1686 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
1687 | |
1688 | #endif |