Commit | Line | Data |
---|---|---|
b77e38aa SR |
1 | /* |
2 | * event tracer | |
3 | * | |
4 | * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> | |
5 | * | |
981d081e SR |
6 | * - Added format output of fields of the trace point. |
7 | * This was based off of work by Tom Zanussi <tzanussi@gmail.com>. | |
8 | * | |
b77e38aa SR |
9 | */ |
10 | ||
e6187007 SR |
11 | #include <linux/workqueue.h> |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/kthread.h> | |
b77e38aa SR |
14 | #include <linux/debugfs.h> |
15 | #include <linux/uaccess.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/ctype.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
e6187007 | 19 | #include <linux/delay.h> |
b77e38aa | 20 | |
020e5f85 LZ |
21 | #include <asm/setup.h> |
22 | ||
91729ef9 | 23 | #include "trace_output.h" |
b77e38aa | 24 | |
4e5292ea | 25 | #undef TRACE_SYSTEM |
b628b3e6 SR |
26 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
27 | ||
20c8928a | 28 | DEFINE_MUTEX(event_mutex); |
11a241a3 | 29 | |
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); |
b3a8c6fd | 37 | static LIST_HEAD(ftrace_common_fields); |
a59fd602 | 38 | |
d1a29143 SR |
39 | #define GFP_TRACE (GFP_KERNEL | __GFP_ZERO) |
40 | ||
41 | static struct kmem_cache *field_cachep; | |
42 | static struct kmem_cache *file_cachep; | |
43 | ||
ae63b31e SR |
44 | /* Double loops, do not use break, only goto's work */ |
45 | #define do_for_each_event_file(tr, file) \ | |
46 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
47 | list_for_each_entry(file, &tr->events, list) | |
48 | ||
49 | #define do_for_each_event_file_safe(tr, file) \ | |
50 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
51 | struct ftrace_event_file *___n; \ | |
52 | list_for_each_entry_safe(file, ___n, &tr->events, list) | |
53 | ||
54 | #define while_for_each_event_file() \ | |
55 | } | |
56 | ||
b3a8c6fd | 57 | static struct list_head * |
2e33af02 SR |
58 | trace_get_fields(struct ftrace_event_call *event_call) |
59 | { | |
60 | if (!event_call->class->get_fields) | |
61 | return &event_call->class->fields; | |
62 | return event_call->class->get_fields(event_call); | |
63 | } | |
64 | ||
b3a8c6fd J |
65 | static struct ftrace_event_field * |
66 | __find_event_field(struct list_head *head, char *name) | |
67 | { | |
68 | struct ftrace_event_field *field; | |
69 | ||
70 | list_for_each_entry(field, head, link) { | |
71 | if (!strcmp(field->name, name)) | |
72 | return field; | |
73 | } | |
74 | ||
75 | return NULL; | |
76 | } | |
77 | ||
78 | struct ftrace_event_field * | |
79 | trace_find_event_field(struct ftrace_event_call *call, char *name) | |
80 | { | |
81 | struct ftrace_event_field *field; | |
82 | struct list_head *head; | |
83 | ||
84 | field = __find_event_field(&ftrace_common_fields, name); | |
85 | if (field) | |
86 | return field; | |
87 | ||
88 | head = trace_get_fields(call); | |
89 | return __find_event_field(head, name); | |
90 | } | |
91 | ||
8728fe50 LZ |
92 | static int __trace_define_field(struct list_head *head, const char *type, |
93 | const char *name, int offset, int size, | |
94 | int is_signed, int filter_type) | |
cf027f64 TZ |
95 | { |
96 | struct ftrace_event_field *field; | |
97 | ||
d1a29143 | 98 | field = kmem_cache_alloc(field_cachep, GFP_TRACE); |
cf027f64 TZ |
99 | if (!field) |
100 | goto err; | |
fe9f57f2 | 101 | |
92edca07 SR |
102 | field->name = name; |
103 | field->type = type; | |
fe9f57f2 | 104 | |
43b51ead LZ |
105 | if (filter_type == FILTER_OTHER) |
106 | field->filter_type = filter_assign_type(type); | |
107 | else | |
108 | field->filter_type = filter_type; | |
109 | ||
cf027f64 TZ |
110 | field->offset = offset; |
111 | field->size = size; | |
a118e4d1 | 112 | field->is_signed = is_signed; |
aa38e9fc | 113 | |
2e33af02 | 114 | list_add(&field->link, head); |
cf027f64 TZ |
115 | |
116 | return 0; | |
fe9f57f2 | 117 | |
cf027f64 | 118 | err: |
d1a29143 | 119 | kmem_cache_free(field_cachep, field); |
fe9f57f2 | 120 | |
cf027f64 TZ |
121 | return -ENOMEM; |
122 | } | |
8728fe50 LZ |
123 | |
124 | int trace_define_field(struct ftrace_event_call *call, const char *type, | |
125 | const char *name, int offset, int size, int is_signed, | |
126 | int filter_type) | |
127 | { | |
128 | struct list_head *head; | |
129 | ||
130 | if (WARN_ON(!call->class)) | |
131 | return 0; | |
132 | ||
133 | head = trace_get_fields(call); | |
134 | return __trace_define_field(head, type, name, offset, size, | |
135 | is_signed, filter_type); | |
136 | } | |
17c873ec | 137 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 138 | |
e647d6b3 | 139 | #define __common_field(type, item) \ |
8728fe50 LZ |
140 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
141 | "common_" #item, \ | |
142 | offsetof(typeof(ent), item), \ | |
143 | sizeof(ent.item), \ | |
144 | is_signed_type(type), FILTER_OTHER); \ | |
e647d6b3 LZ |
145 | if (ret) \ |
146 | return ret; | |
147 | ||
8728fe50 | 148 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
149 | { |
150 | int ret; | |
151 | struct trace_entry ent; | |
152 | ||
153 | __common_field(unsigned short, type); | |
154 | __common_field(unsigned char, flags); | |
155 | __common_field(unsigned char, preempt_count); | |
156 | __common_field(int, pid); | |
e647d6b3 LZ |
157 | |
158 | return ret; | |
159 | } | |
160 | ||
ad7067ce | 161 | static void trace_destroy_fields(struct ftrace_event_call *call) |
2df75e41 LZ |
162 | { |
163 | struct ftrace_event_field *field, *next; | |
2e33af02 | 164 | struct list_head *head; |
2df75e41 | 165 | |
2e33af02 SR |
166 | head = trace_get_fields(call); |
167 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 | 168 | list_del(&field->link); |
d1a29143 | 169 | kmem_cache_free(field_cachep, field); |
2df75e41 LZ |
170 | } |
171 | } | |
172 | ||
87d9b4e1 LZ |
173 | int trace_event_raw_init(struct ftrace_event_call *call) |
174 | { | |
175 | int id; | |
176 | ||
80decc70 | 177 | id = register_ftrace_event(&call->event); |
87d9b4e1 LZ |
178 | if (!id) |
179 | return -ENODEV; | |
87d9b4e1 LZ |
180 | |
181 | return 0; | |
182 | } | |
183 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
184 | ||
ceec0b6f JO |
185 | int ftrace_event_reg(struct ftrace_event_call *call, |
186 | enum trace_reg type, void *data) | |
a1d0ce82 | 187 | { |
ae63b31e SR |
188 | struct ftrace_event_file *file = data; |
189 | ||
a1d0ce82 SR |
190 | switch (type) { |
191 | case TRACE_REG_REGISTER: | |
192 | return tracepoint_probe_register(call->name, | |
193 | call->class->probe, | |
ae63b31e | 194 | file); |
a1d0ce82 SR |
195 | case TRACE_REG_UNREGISTER: |
196 | tracepoint_probe_unregister(call->name, | |
197 | call->class->probe, | |
ae63b31e | 198 | file); |
a1d0ce82 SR |
199 | return 0; |
200 | ||
201 | #ifdef CONFIG_PERF_EVENTS | |
202 | case TRACE_REG_PERF_REGISTER: | |
203 | return tracepoint_probe_register(call->name, | |
204 | call->class->perf_probe, | |
205 | call); | |
206 | case TRACE_REG_PERF_UNREGISTER: | |
207 | tracepoint_probe_unregister(call->name, | |
208 | call->class->perf_probe, | |
209 | call); | |
210 | return 0; | |
ceec0b6f JO |
211 | case TRACE_REG_PERF_OPEN: |
212 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
213 | case TRACE_REG_PERF_ADD: |
214 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 215 | return 0; |
a1d0ce82 SR |
216 | #endif |
217 | } | |
218 | return 0; | |
219 | } | |
220 | EXPORT_SYMBOL_GPL(ftrace_event_reg); | |
221 | ||
e870e9a1 LZ |
222 | void trace_event_enable_cmd_record(bool enable) |
223 | { | |
ae63b31e SR |
224 | struct ftrace_event_file *file; |
225 | struct trace_array *tr; | |
e870e9a1 LZ |
226 | |
227 | mutex_lock(&event_mutex); | |
ae63b31e SR |
228 | do_for_each_event_file(tr, file) { |
229 | ||
230 | if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) | |
e870e9a1 LZ |
231 | continue; |
232 | ||
233 | if (enable) { | |
234 | tracing_start_cmdline_record(); | |
417944c4 | 235 | set_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 LZ |
236 | } else { |
237 | tracing_stop_cmdline_record(); | |
417944c4 | 238 | clear_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 239 | } |
ae63b31e | 240 | } while_for_each_event_file(); |
e870e9a1 LZ |
241 | mutex_unlock(&event_mutex); |
242 | } | |
243 | ||
417944c4 SRRH |
244 | static int __ftrace_event_enable_disable(struct ftrace_event_file *file, |
245 | int enable, int soft_disable) | |
fd994989 | 246 | { |
ae63b31e | 247 | struct ftrace_event_call *call = file->event_call; |
3b8e4273 | 248 | int ret = 0; |
417944c4 | 249 | int disable; |
3b8e4273 | 250 | |
fd994989 SR |
251 | switch (enable) { |
252 | case 0: | |
417944c4 | 253 | /* |
1cf4c073 MH |
254 | * When soft_disable is set and enable is cleared, the sm_ref |
255 | * reference counter is decremented. If it reaches 0, we want | |
417944c4 SRRH |
256 | * to clear the SOFT_DISABLED flag but leave the event in the |
257 | * state that it was. That is, if the event was enabled and | |
258 | * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED | |
259 | * is set we do not want the event to be enabled before we | |
260 | * clear the bit. | |
261 | * | |
262 | * When soft_disable is not set but the SOFT_MODE flag is, | |
263 | * we do nothing. Do not disable the tracepoint, otherwise | |
264 | * "soft enable"s (clearing the SOFT_DISABLED bit) wont work. | |
265 | */ | |
266 | if (soft_disable) { | |
1cf4c073 MH |
267 | if (atomic_dec_return(&file->sm_ref) > 0) |
268 | break; | |
417944c4 SRRH |
269 | disable = file->flags & FTRACE_EVENT_FL_SOFT_DISABLED; |
270 | clear_bit(FTRACE_EVENT_FL_SOFT_MODE_BIT, &file->flags); | |
271 | } else | |
272 | disable = !(file->flags & FTRACE_EVENT_FL_SOFT_MODE); | |
273 | ||
274 | if (disable && (file->flags & FTRACE_EVENT_FL_ENABLED)) { | |
275 | clear_bit(FTRACE_EVENT_FL_ENABLED_BIT, &file->flags); | |
ae63b31e | 276 | if (file->flags & FTRACE_EVENT_FL_RECORDED_CMD) { |
e870e9a1 | 277 | tracing_stop_cmdline_record(); |
417944c4 | 278 | clear_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 279 | } |
ae63b31e | 280 | call->class->reg(call, TRACE_REG_UNREGISTER, file); |
fd994989 | 281 | } |
417944c4 SRRH |
282 | /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT */ |
283 | if (file->flags & FTRACE_EVENT_FL_SOFT_MODE) | |
284 | set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); | |
fd994989 SR |
285 | break; |
286 | case 1: | |
417944c4 SRRH |
287 | /* |
288 | * When soft_disable is set and enable is set, we want to | |
289 | * register the tracepoint for the event, but leave the event | |
290 | * as is. That means, if the event was already enabled, we do | |
291 | * nothing (but set SOFT_MODE). If the event is disabled, we | |
292 | * set SOFT_DISABLED before enabling the event tracepoint, so | |
293 | * it still seems to be disabled. | |
294 | */ | |
295 | if (!soft_disable) | |
296 | clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); | |
1cf4c073 MH |
297 | else { |
298 | if (atomic_inc_return(&file->sm_ref) > 1) | |
299 | break; | |
417944c4 | 300 | set_bit(FTRACE_EVENT_FL_SOFT_MODE_BIT, &file->flags); |
1cf4c073 | 301 | } |
417944c4 | 302 | |
ae63b31e | 303 | if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) { |
417944c4 SRRH |
304 | |
305 | /* Keep the event disabled, when going to SOFT_MODE. */ | |
306 | if (soft_disable) | |
307 | set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); | |
308 | ||
e870e9a1 LZ |
309 | if (trace_flags & TRACE_ITER_RECORD_CMD) { |
310 | tracing_start_cmdline_record(); | |
417944c4 | 311 | set_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 312 | } |
ae63b31e | 313 | ret = call->class->reg(call, TRACE_REG_REGISTER, file); |
3b8e4273 LZ |
314 | if (ret) { |
315 | tracing_stop_cmdline_record(); | |
316 | pr_info("event trace: Could not enable event " | |
317 | "%s\n", call->name); | |
318 | break; | |
319 | } | |
417944c4 | 320 | set_bit(FTRACE_EVENT_FL_ENABLED_BIT, &file->flags); |
575380da SRRH |
321 | |
322 | /* WAS_ENABLED gets set but never cleared. */ | |
323 | call->flags |= TRACE_EVENT_FL_WAS_ENABLED; | |
fd994989 | 324 | } |
fd994989 SR |
325 | break; |
326 | } | |
3b8e4273 LZ |
327 | |
328 | return ret; | |
fd994989 SR |
329 | } |
330 | ||
417944c4 SRRH |
331 | static int ftrace_event_enable_disable(struct ftrace_event_file *file, |
332 | int enable) | |
333 | { | |
334 | return __ftrace_event_enable_disable(file, enable, 0); | |
335 | } | |
336 | ||
ae63b31e | 337 | static void ftrace_clear_events(struct trace_array *tr) |
0e907c99 | 338 | { |
ae63b31e | 339 | struct ftrace_event_file *file; |
0e907c99 Z |
340 | |
341 | mutex_lock(&event_mutex); | |
ae63b31e SR |
342 | list_for_each_entry(file, &tr->events, list) { |
343 | ftrace_event_enable_disable(file, 0); | |
0e907c99 Z |
344 | } |
345 | mutex_unlock(&event_mutex); | |
346 | } | |
347 | ||
e9dbfae5 SR |
348 | static void __put_system(struct event_subsystem *system) |
349 | { | |
350 | struct event_filter *filter = system->filter; | |
351 | ||
352 | WARN_ON_ONCE(system->ref_count == 0); | |
353 | if (--system->ref_count) | |
354 | return; | |
355 | ||
ae63b31e SR |
356 | list_del(&system->list); |
357 | ||
e9dbfae5 SR |
358 | if (filter) { |
359 | kfree(filter->filter_string); | |
360 | kfree(filter); | |
361 | } | |
e9dbfae5 SR |
362 | kfree(system); |
363 | } | |
364 | ||
365 | static void __get_system(struct event_subsystem *system) | |
366 | { | |
367 | WARN_ON_ONCE(system->ref_count == 0); | |
368 | system->ref_count++; | |
369 | } | |
370 | ||
ae63b31e SR |
371 | static void __get_system_dir(struct ftrace_subsystem_dir *dir) |
372 | { | |
373 | WARN_ON_ONCE(dir->ref_count == 0); | |
374 | dir->ref_count++; | |
375 | __get_system(dir->subsystem); | |
376 | } | |
377 | ||
378 | static void __put_system_dir(struct ftrace_subsystem_dir *dir) | |
379 | { | |
380 | WARN_ON_ONCE(dir->ref_count == 0); | |
381 | /* If the subsystem is about to be freed, the dir must be too */ | |
382 | WARN_ON_ONCE(dir->subsystem->ref_count == 1 && dir->ref_count != 1); | |
383 | ||
384 | __put_system(dir->subsystem); | |
385 | if (!--dir->ref_count) | |
386 | kfree(dir); | |
387 | } | |
388 | ||
389 | static void put_system(struct ftrace_subsystem_dir *dir) | |
e9dbfae5 SR |
390 | { |
391 | mutex_lock(&event_mutex); | |
ae63b31e | 392 | __put_system_dir(dir); |
e9dbfae5 SR |
393 | mutex_unlock(&event_mutex); |
394 | } | |
395 | ||
8f31bfe5 LZ |
396 | /* |
397 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
398 | */ | |
ae63b31e SR |
399 | static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, |
400 | const char *sub, const char *event, int set) | |
b77e38aa | 401 | { |
ae63b31e | 402 | struct ftrace_event_file *file; |
a59fd602 | 403 | struct ftrace_event_call *call; |
29f93943 | 404 | int ret = -EINVAL; |
8f31bfe5 LZ |
405 | |
406 | mutex_lock(&event_mutex); | |
ae63b31e SR |
407 | list_for_each_entry(file, &tr->events, list) { |
408 | ||
409 | call = file->event_call; | |
8f31bfe5 | 410 | |
a1d0ce82 | 411 | if (!call->name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
412 | continue; |
413 | ||
9b63776f SR |
414 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
415 | continue; | |
416 | ||
8f31bfe5 LZ |
417 | if (match && |
418 | strcmp(match, call->name) != 0 && | |
8f082018 | 419 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
420 | continue; |
421 | ||
8f082018 | 422 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
423 | continue; |
424 | ||
425 | if (event && strcmp(event, call->name) != 0) | |
426 | continue; | |
427 | ||
ae63b31e | 428 | ftrace_event_enable_disable(file, set); |
8f31bfe5 LZ |
429 | |
430 | ret = 0; | |
431 | } | |
432 | mutex_unlock(&event_mutex); | |
433 | ||
434 | return ret; | |
435 | } | |
436 | ||
ae63b31e | 437 | static int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set) |
8f31bfe5 | 438 | { |
b628b3e6 | 439 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
440 | |
441 | /* | |
442 | * The buf format can be <subsystem>:<event-name> | |
443 | * *:<event-name> means any event by that name. | |
444 | * :<event-name> is the same. | |
445 | * | |
446 | * <subsystem>:* means all events in that subsystem | |
447 | * <subsystem>: means the same. | |
448 | * | |
449 | * <name> (no ':') means all events in a subsystem with | |
450 | * the name <name> or any event that matches <name> | |
451 | */ | |
452 | ||
453 | match = strsep(&buf, ":"); | |
454 | if (buf) { | |
455 | sub = match; | |
456 | event = buf; | |
457 | match = NULL; | |
458 | ||
459 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
460 | sub = NULL; | |
461 | if (!strlen(event) || strcmp(event, "*") == 0) | |
462 | event = NULL; | |
463 | } | |
b77e38aa | 464 | |
ae63b31e | 465 | return __ftrace_set_clr_event(tr, match, sub, event, set); |
b77e38aa SR |
466 | } |
467 | ||
4671c794 SR |
468 | /** |
469 | * trace_set_clr_event - enable or disable an event | |
470 | * @system: system name to match (NULL for any system) | |
471 | * @event: event name to match (NULL for all events, within system) | |
472 | * @set: 1 to enable, 0 to disable | |
473 | * | |
474 | * This is a way for other parts of the kernel to enable or disable | |
475 | * event recording. | |
476 | * | |
477 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
478 | * registered events. | |
479 | */ | |
480 | int trace_set_clr_event(const char *system, const char *event, int set) | |
481 | { | |
ae63b31e SR |
482 | struct trace_array *tr = top_trace_array(); |
483 | ||
484 | return __ftrace_set_clr_event(tr, NULL, system, event, set); | |
4671c794 | 485 | } |
56355b83 | 486 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 487 | |
b77e38aa SR |
488 | /* 128 should be much more than enough */ |
489 | #define EVENT_BUF_SIZE 127 | |
490 | ||
491 | static ssize_t | |
492 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
493 | size_t cnt, loff_t *ppos) | |
494 | { | |
48966364 | 495 | struct trace_parser parser; |
ae63b31e SR |
496 | struct seq_file *m = file->private_data; |
497 | struct trace_array *tr = m->private; | |
4ba7978e | 498 | ssize_t read, ret; |
b77e38aa | 499 | |
4ba7978e | 500 | if (!cnt) |
b77e38aa SR |
501 | return 0; |
502 | ||
1852fcce SR |
503 | ret = tracing_update_buffers(); |
504 | if (ret < 0) | |
505 | return ret; | |
506 | ||
48966364 | 507 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
508 | return -ENOMEM; |
509 | ||
48966364 | 510 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
511 | ||
4ba7978e | 512 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 513 | int set = 1; |
b77e38aa | 514 | |
48966364 | 515 | if (*parser.buffer == '!') |
b77e38aa | 516 | set = 0; |
b77e38aa | 517 | |
48966364 | 518 | parser.buffer[parser.idx] = 0; |
519 | ||
ae63b31e | 520 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
b77e38aa | 521 | if (ret) |
48966364 | 522 | goto out_put; |
b77e38aa | 523 | } |
b77e38aa SR |
524 | |
525 | ret = read; | |
526 | ||
48966364 | 527 | out_put: |
528 | trace_parser_put(&parser); | |
b77e38aa SR |
529 | |
530 | return ret; | |
531 | } | |
532 | ||
533 | static void * | |
534 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
535 | { | |
ae63b31e SR |
536 | struct ftrace_event_file *file = v; |
537 | struct ftrace_event_call *call; | |
538 | struct trace_array *tr = m->private; | |
b77e38aa SR |
539 | |
540 | (*pos)++; | |
541 | ||
ae63b31e SR |
542 | list_for_each_entry_continue(file, &tr->events, list) { |
543 | call = file->event_call; | |
40e26815 SR |
544 | /* |
545 | * The ftrace subsystem is for showing formats only. | |
546 | * They can not be enabled or disabled via the event files. | |
547 | */ | |
a1d0ce82 | 548 | if (call->class && call->class->reg) |
ae63b31e | 549 | return file; |
40e26815 | 550 | } |
b77e38aa | 551 | |
30bd39cd | 552 | return NULL; |
b77e38aa SR |
553 | } |
554 | ||
555 | static void *t_start(struct seq_file *m, loff_t *pos) | |
556 | { | |
ae63b31e SR |
557 | struct ftrace_event_file *file; |
558 | struct trace_array *tr = m->private; | |
e1c7e2a6 LZ |
559 | loff_t l; |
560 | ||
20c8928a | 561 | mutex_lock(&event_mutex); |
e1c7e2a6 | 562 | |
ae63b31e | 563 | file = list_entry(&tr->events, struct ftrace_event_file, list); |
e1c7e2a6 | 564 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
565 | file = t_next(m, file, &l); |
566 | if (!file) | |
e1c7e2a6 LZ |
567 | break; |
568 | } | |
ae63b31e | 569 | return file; |
b77e38aa SR |
570 | } |
571 | ||
572 | static void * | |
573 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
574 | { | |
ae63b31e SR |
575 | struct ftrace_event_file *file = v; |
576 | struct trace_array *tr = m->private; | |
b77e38aa SR |
577 | |
578 | (*pos)++; | |
579 | ||
ae63b31e SR |
580 | list_for_each_entry_continue(file, &tr->events, list) { |
581 | if (file->flags & FTRACE_EVENT_FL_ENABLED) | |
582 | return file; | |
b77e38aa SR |
583 | } |
584 | ||
30bd39cd | 585 | return NULL; |
b77e38aa SR |
586 | } |
587 | ||
588 | static void *s_start(struct seq_file *m, loff_t *pos) | |
589 | { | |
ae63b31e SR |
590 | struct ftrace_event_file *file; |
591 | struct trace_array *tr = m->private; | |
e1c7e2a6 LZ |
592 | loff_t l; |
593 | ||
20c8928a | 594 | mutex_lock(&event_mutex); |
e1c7e2a6 | 595 | |
ae63b31e | 596 | file = list_entry(&tr->events, struct ftrace_event_file, list); |
e1c7e2a6 | 597 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
598 | file = s_next(m, file, &l); |
599 | if (!file) | |
e1c7e2a6 LZ |
600 | break; |
601 | } | |
ae63b31e | 602 | return file; |
b77e38aa SR |
603 | } |
604 | ||
605 | static int t_show(struct seq_file *m, void *v) | |
606 | { | |
ae63b31e SR |
607 | struct ftrace_event_file *file = v; |
608 | struct ftrace_event_call *call = file->event_call; | |
b77e38aa | 609 | |
8f082018 SR |
610 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
611 | seq_printf(m, "%s:", call->class->system); | |
b77e38aa SR |
612 | seq_printf(m, "%s\n", call->name); |
613 | ||
614 | return 0; | |
615 | } | |
616 | ||
617 | static void t_stop(struct seq_file *m, void *p) | |
618 | { | |
20c8928a | 619 | mutex_unlock(&event_mutex); |
b77e38aa SR |
620 | } |
621 | ||
1473e441 SR |
622 | static ssize_t |
623 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
624 | loff_t *ppos) | |
625 | { | |
ae63b31e | 626 | struct ftrace_event_file *file = filp->private_data; |
1473e441 SR |
627 | char *buf; |
628 | ||
417944c4 SRRH |
629 | if (file->flags & FTRACE_EVENT_FL_ENABLED) { |
630 | if (file->flags & FTRACE_EVENT_FL_SOFT_DISABLED) | |
631 | buf = "0*\n"; | |
30052170 MH |
632 | else if (file->flags & FTRACE_EVENT_FL_SOFT_MODE) |
633 | buf = "1*\n"; | |
417944c4 SRRH |
634 | else |
635 | buf = "1\n"; | |
636 | } else | |
1473e441 SR |
637 | buf = "0\n"; |
638 | ||
417944c4 | 639 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf)); |
1473e441 SR |
640 | } |
641 | ||
642 | static ssize_t | |
643 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
644 | loff_t *ppos) | |
645 | { | |
ae63b31e | 646 | struct ftrace_event_file *file = filp->private_data; |
1473e441 SR |
647 | unsigned long val; |
648 | int ret; | |
649 | ||
ae63b31e SR |
650 | if (!file) |
651 | return -EINVAL; | |
652 | ||
22fe9b54 PH |
653 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
654 | if (ret) | |
1473e441 SR |
655 | return ret; |
656 | ||
1852fcce SR |
657 | ret = tracing_update_buffers(); |
658 | if (ret < 0) | |
659 | return ret; | |
660 | ||
1473e441 SR |
661 | switch (val) { |
662 | case 0: | |
1473e441 | 663 | case 1: |
11a241a3 | 664 | mutex_lock(&event_mutex); |
ae63b31e | 665 | ret = ftrace_event_enable_disable(file, val); |
11a241a3 | 666 | mutex_unlock(&event_mutex); |
1473e441 SR |
667 | break; |
668 | ||
669 | default: | |
670 | return -EINVAL; | |
671 | } | |
672 | ||
673 | *ppos += cnt; | |
674 | ||
3b8e4273 | 675 | return ret ? ret : cnt; |
1473e441 SR |
676 | } |
677 | ||
8ae79a13 SR |
678 | static ssize_t |
679 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
680 | loff_t *ppos) | |
681 | { | |
c142b15d | 682 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
ae63b31e SR |
683 | struct ftrace_subsystem_dir *dir = filp->private_data; |
684 | struct event_subsystem *system = dir->subsystem; | |
8ae79a13 | 685 | struct ftrace_event_call *call; |
ae63b31e SR |
686 | struct ftrace_event_file *file; |
687 | struct trace_array *tr = dir->tr; | |
8ae79a13 | 688 | char buf[2]; |
c142b15d | 689 | int set = 0; |
8ae79a13 SR |
690 | int ret; |
691 | ||
8ae79a13 | 692 | mutex_lock(&event_mutex); |
ae63b31e SR |
693 | list_for_each_entry(file, &tr->events, list) { |
694 | call = file->event_call; | |
a1d0ce82 | 695 | if (!call->name || !call->class || !call->class->reg) |
8ae79a13 SR |
696 | continue; |
697 | ||
40ee4dff | 698 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
699 | continue; |
700 | ||
701 | /* | |
702 | * We need to find out if all the events are set | |
703 | * or if all events or cleared, or if we have | |
704 | * a mixture. | |
705 | */ | |
ae63b31e | 706 | set |= (1 << !!(file->flags & FTRACE_EVENT_FL_ENABLED)); |
c142b15d | 707 | |
8ae79a13 SR |
708 | /* |
709 | * If we have a mixture, no need to look further. | |
710 | */ | |
c142b15d | 711 | if (set == 3) |
8ae79a13 SR |
712 | break; |
713 | } | |
714 | mutex_unlock(&event_mutex); | |
715 | ||
c142b15d | 716 | buf[0] = set_to_char[set]; |
8ae79a13 | 717 | buf[1] = '\n'; |
8ae79a13 SR |
718 | |
719 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
720 | ||
721 | return ret; | |
722 | } | |
723 | ||
724 | static ssize_t | |
725 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
726 | loff_t *ppos) | |
727 | { | |
ae63b31e SR |
728 | struct ftrace_subsystem_dir *dir = filp->private_data; |
729 | struct event_subsystem *system = dir->subsystem; | |
40ee4dff | 730 | const char *name = NULL; |
8ae79a13 | 731 | unsigned long val; |
8ae79a13 SR |
732 | ssize_t ret; |
733 | ||
22fe9b54 PH |
734 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
735 | if (ret) | |
8ae79a13 SR |
736 | return ret; |
737 | ||
738 | ret = tracing_update_buffers(); | |
739 | if (ret < 0) | |
740 | return ret; | |
741 | ||
8f31bfe5 | 742 | if (val != 0 && val != 1) |
8ae79a13 | 743 | return -EINVAL; |
8ae79a13 | 744 | |
40ee4dff SR |
745 | /* |
746 | * Opening of "enable" adds a ref count to system, | |
747 | * so the name is safe to use. | |
748 | */ | |
749 | if (system) | |
750 | name = system->name; | |
751 | ||
ae63b31e | 752 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
8ae79a13 | 753 | if (ret) |
8f31bfe5 | 754 | goto out; |
8ae79a13 SR |
755 | |
756 | ret = cnt; | |
757 | ||
8f31bfe5 | 758 | out: |
8ae79a13 SR |
759 | *ppos += cnt; |
760 | ||
761 | return ret; | |
762 | } | |
763 | ||
2a37a3df SR |
764 | enum { |
765 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
766 | FORMAT_FIELD_SEPERATOR = 2, |
767 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
768 | }; |
769 | ||
770 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 771 | { |
2a37a3df | 772 | struct ftrace_event_call *call = m->private; |
5a65e956 | 773 | struct ftrace_event_field *field; |
86397dc3 LZ |
774 | struct list_head *common_head = &ftrace_common_fields; |
775 | struct list_head *head = trace_get_fields(call); | |
981d081e | 776 | |
2a37a3df | 777 | (*pos)++; |
5a65e956 | 778 | |
2a37a3df SR |
779 | switch ((unsigned long)v) { |
780 | case FORMAT_HEADER: | |
86397dc3 LZ |
781 | if (unlikely(list_empty(common_head))) |
782 | return NULL; | |
783 | ||
784 | field = list_entry(common_head->prev, | |
785 | struct ftrace_event_field, link); | |
786 | return field; | |
5a65e956 | 787 | |
86397dc3 | 788 | case FORMAT_FIELD_SEPERATOR: |
2a37a3df SR |
789 | if (unlikely(list_empty(head))) |
790 | return NULL; | |
5a65e956 | 791 | |
2a37a3df SR |
792 | field = list_entry(head->prev, struct ftrace_event_field, link); |
793 | return field; | |
5a65e956 | 794 | |
2a37a3df SR |
795 | case FORMAT_PRINTFMT: |
796 | /* all done */ | |
797 | return NULL; | |
5a65e956 LJ |
798 | } |
799 | ||
2a37a3df | 800 | field = v; |
86397dc3 LZ |
801 | if (field->link.prev == common_head) |
802 | return (void *)FORMAT_FIELD_SEPERATOR; | |
803 | else if (field->link.prev == head) | |
2a37a3df SR |
804 | return (void *)FORMAT_PRINTFMT; |
805 | ||
806 | field = list_entry(field->link.prev, struct ftrace_event_field, link); | |
807 | ||
2a37a3df | 808 | return field; |
8728fe50 | 809 | } |
5a65e956 | 810 | |
2a37a3df | 811 | static void *f_start(struct seq_file *m, loff_t *pos) |
8728fe50 | 812 | { |
2a37a3df SR |
813 | loff_t l = 0; |
814 | void *p; | |
5a65e956 | 815 | |
2a37a3df SR |
816 | /* Start by showing the header */ |
817 | if (!*pos) | |
818 | return (void *)FORMAT_HEADER; | |
819 | ||
820 | p = (void *)FORMAT_HEADER; | |
821 | do { | |
822 | p = f_next(m, p, &l); | |
823 | } while (p && l < *pos); | |
824 | ||
825 | return p; | |
826 | } | |
827 | ||
828 | static int f_show(struct seq_file *m, void *v) | |
829 | { | |
830 | struct ftrace_event_call *call = m->private; | |
831 | struct ftrace_event_field *field; | |
832 | const char *array_descriptor; | |
833 | ||
834 | switch ((unsigned long)v) { | |
835 | case FORMAT_HEADER: | |
836 | seq_printf(m, "name: %s\n", call->name); | |
837 | seq_printf(m, "ID: %d\n", call->event.type); | |
838 | seq_printf(m, "format:\n"); | |
8728fe50 | 839 | return 0; |
5a65e956 | 840 | |
86397dc3 LZ |
841 | case FORMAT_FIELD_SEPERATOR: |
842 | seq_putc(m, '\n'); | |
843 | return 0; | |
844 | ||
2a37a3df SR |
845 | case FORMAT_PRINTFMT: |
846 | seq_printf(m, "\nprint fmt: %s\n", | |
847 | call->print_fmt); | |
848 | return 0; | |
981d081e | 849 | } |
8728fe50 | 850 | |
2a37a3df | 851 | field = v; |
8728fe50 | 852 | |
2a37a3df SR |
853 | /* |
854 | * Smartly shows the array type(except dynamic array). | |
855 | * Normal: | |
856 | * field:TYPE VAR | |
857 | * If TYPE := TYPE[LEN], it is shown: | |
858 | * field:TYPE VAR[LEN] | |
859 | */ | |
860 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 861 | |
2a37a3df SR |
862 | if (!strncmp(field->type, "__data_loc", 10)) |
863 | array_descriptor = NULL; | |
8728fe50 | 864 | |
2a37a3df SR |
865 | if (!array_descriptor) |
866 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
867 | field->type, field->name, field->offset, | |
868 | field->size, !!field->is_signed); | |
869 | else | |
870 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
871 | (int)(array_descriptor - field->type), | |
872 | field->type, field->name, | |
873 | array_descriptor, field->offset, | |
874 | field->size, !!field->is_signed); | |
8728fe50 | 875 | |
2a37a3df SR |
876 | return 0; |
877 | } | |
5a65e956 | 878 | |
2a37a3df SR |
879 | static void f_stop(struct seq_file *m, void *p) |
880 | { | |
881 | } | |
981d081e | 882 | |
2a37a3df SR |
883 | static const struct seq_operations trace_format_seq_ops = { |
884 | .start = f_start, | |
885 | .next = f_next, | |
886 | .stop = f_stop, | |
887 | .show = f_show, | |
888 | }; | |
889 | ||
890 | static int trace_format_open(struct inode *inode, struct file *file) | |
891 | { | |
892 | struct ftrace_event_call *call = inode->i_private; | |
893 | struct seq_file *m; | |
894 | int ret; | |
895 | ||
896 | ret = seq_open(file, &trace_format_seq_ops); | |
897 | if (ret < 0) | |
898 | return ret; | |
899 | ||
900 | m = file->private_data; | |
901 | m->private = call; | |
902 | ||
903 | return 0; | |
981d081e SR |
904 | } |
905 | ||
23725aee PZ |
906 | static ssize_t |
907 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
908 | { | |
909 | struct ftrace_event_call *call = filp->private_data; | |
910 | struct trace_seq *s; | |
911 | int r; | |
912 | ||
913 | if (*ppos) | |
914 | return 0; | |
915 | ||
916 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
917 | if (!s) | |
918 | return -ENOMEM; | |
919 | ||
920 | trace_seq_init(s); | |
32c0edae | 921 | trace_seq_printf(s, "%d\n", call->event.type); |
23725aee PZ |
922 | |
923 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
924 | s->buffer, s->len); | |
925 | kfree(s); | |
926 | return r; | |
927 | } | |
928 | ||
7ce7e424 TZ |
929 | static ssize_t |
930 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
931 | loff_t *ppos) | |
932 | { | |
933 | struct ftrace_event_call *call = filp->private_data; | |
934 | struct trace_seq *s; | |
935 | int r; | |
936 | ||
937 | if (*ppos) | |
938 | return 0; | |
939 | ||
940 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
941 | if (!s) | |
942 | return -ENOMEM; | |
943 | ||
944 | trace_seq_init(s); | |
945 | ||
8b372562 | 946 | print_event_filter(call, s); |
4bda2d51 | 947 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
948 | |
949 | kfree(s); | |
950 | ||
951 | return r; | |
952 | } | |
953 | ||
954 | static ssize_t | |
955 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
956 | loff_t *ppos) | |
957 | { | |
958 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 959 | char *buf; |
7ce7e424 TZ |
960 | int err; |
961 | ||
8b372562 | 962 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
963 | return -EINVAL; |
964 | ||
8b372562 TZ |
965 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
966 | if (!buf) | |
7ce7e424 TZ |
967 | return -ENOMEM; |
968 | ||
8b372562 TZ |
969 | if (copy_from_user(buf, ubuf, cnt)) { |
970 | free_page((unsigned long) buf); | |
971 | return -EFAULT; | |
7ce7e424 | 972 | } |
8b372562 | 973 | buf[cnt] = '\0'; |
7ce7e424 | 974 | |
8b372562 TZ |
975 | err = apply_event_filter(call, buf); |
976 | free_page((unsigned long) buf); | |
977 | if (err < 0) | |
44e9c8b7 | 978 | return err; |
0a19e53c | 979 | |
7ce7e424 TZ |
980 | *ppos += cnt; |
981 | ||
982 | return cnt; | |
983 | } | |
984 | ||
e9dbfae5 SR |
985 | static LIST_HEAD(event_subsystems); |
986 | ||
987 | static int subsystem_open(struct inode *inode, struct file *filp) | |
988 | { | |
989 | struct event_subsystem *system = NULL; | |
ae63b31e SR |
990 | struct ftrace_subsystem_dir *dir = NULL; /* Initialize for gcc */ |
991 | struct trace_array *tr; | |
e9dbfae5 SR |
992 | int ret; |
993 | ||
994 | /* Make sure the system still exists */ | |
995 | mutex_lock(&event_mutex); | |
ae63b31e SR |
996 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
997 | list_for_each_entry(dir, &tr->systems, list) { | |
998 | if (dir == inode->i_private) { | |
999 | /* Don't open systems with no events */ | |
1000 | if (dir->nr_events) { | |
1001 | __get_system_dir(dir); | |
1002 | system = dir->subsystem; | |
1003 | } | |
1004 | goto exit_loop; | |
e9dbfae5 | 1005 | } |
e9dbfae5 SR |
1006 | } |
1007 | } | |
ae63b31e | 1008 | exit_loop: |
e9dbfae5 SR |
1009 | mutex_unlock(&event_mutex); |
1010 | ||
ae63b31e | 1011 | if (!system) |
e9dbfae5 SR |
1012 | return -ENODEV; |
1013 | ||
ae63b31e SR |
1014 | /* Some versions of gcc think dir can be uninitialized here */ |
1015 | WARN_ON(!dir); | |
1016 | ||
e9dbfae5 | 1017 | ret = tracing_open_generic(inode, filp); |
ae63b31e SR |
1018 | if (ret < 0) |
1019 | put_system(dir); | |
1020 | ||
1021 | return ret; | |
1022 | } | |
1023 | ||
1024 | static int system_tr_open(struct inode *inode, struct file *filp) | |
1025 | { | |
1026 | struct ftrace_subsystem_dir *dir; | |
1027 | struct trace_array *tr = inode->i_private; | |
1028 | int ret; | |
1029 | ||
1030 | /* Make a temporary dir that has no system but points to tr */ | |
1031 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); | |
1032 | if (!dir) | |
1033 | return -ENOMEM; | |
1034 | ||
1035 | dir->tr = tr; | |
1036 | ||
1037 | ret = tracing_open_generic(inode, filp); | |
1038 | if (ret < 0) | |
1039 | kfree(dir); | |
1040 | ||
1041 | filp->private_data = dir; | |
e9dbfae5 SR |
1042 | |
1043 | return ret; | |
1044 | } | |
1045 | ||
1046 | static int subsystem_release(struct inode *inode, struct file *file) | |
1047 | { | |
ae63b31e | 1048 | struct ftrace_subsystem_dir *dir = file->private_data; |
e9dbfae5 | 1049 | |
ae63b31e SR |
1050 | /* |
1051 | * If dir->subsystem is NULL, then this is a temporary | |
1052 | * descriptor that was made for a trace_array to enable | |
1053 | * all subsystems. | |
1054 | */ | |
1055 | if (dir->subsystem) | |
1056 | put_system(dir); | |
1057 | else | |
1058 | kfree(dir); | |
e9dbfae5 SR |
1059 | |
1060 | return 0; | |
1061 | } | |
1062 | ||
cfb180f3 TZ |
1063 | static ssize_t |
1064 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1065 | loff_t *ppos) | |
1066 | { | |
ae63b31e SR |
1067 | struct ftrace_subsystem_dir *dir = filp->private_data; |
1068 | struct event_subsystem *system = dir->subsystem; | |
cfb180f3 TZ |
1069 | struct trace_seq *s; |
1070 | int r; | |
1071 | ||
1072 | if (*ppos) | |
1073 | return 0; | |
1074 | ||
1075 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1076 | if (!s) | |
1077 | return -ENOMEM; | |
1078 | ||
1079 | trace_seq_init(s); | |
1080 | ||
8b372562 | 1081 | print_subsystem_event_filter(system, s); |
4bda2d51 | 1082 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
1083 | |
1084 | kfree(s); | |
1085 | ||
1086 | return r; | |
1087 | } | |
1088 | ||
1089 | static ssize_t | |
1090 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1091 | loff_t *ppos) | |
1092 | { | |
ae63b31e | 1093 | struct ftrace_subsystem_dir *dir = filp->private_data; |
8b372562 | 1094 | char *buf; |
cfb180f3 TZ |
1095 | int err; |
1096 | ||
8b372562 | 1097 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
1098 | return -EINVAL; |
1099 | ||
8b372562 TZ |
1100 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
1101 | if (!buf) | |
cfb180f3 TZ |
1102 | return -ENOMEM; |
1103 | ||
8b372562 TZ |
1104 | if (copy_from_user(buf, ubuf, cnt)) { |
1105 | free_page((unsigned long) buf); | |
1106 | return -EFAULT; | |
cfb180f3 | 1107 | } |
8b372562 | 1108 | buf[cnt] = '\0'; |
cfb180f3 | 1109 | |
ae63b31e | 1110 | err = apply_subsystem_event_filter(dir, buf); |
8b372562 TZ |
1111 | free_page((unsigned long) buf); |
1112 | if (err < 0) | |
44e9c8b7 | 1113 | return err; |
cfb180f3 TZ |
1114 | |
1115 | *ppos += cnt; | |
1116 | ||
1117 | return cnt; | |
1118 | } | |
1119 | ||
d1b182a8 SR |
1120 | static ssize_t |
1121 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1122 | { | |
1123 | int (*func)(struct trace_seq *s) = filp->private_data; | |
1124 | struct trace_seq *s; | |
1125 | int r; | |
1126 | ||
1127 | if (*ppos) | |
1128 | return 0; | |
1129 | ||
1130 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1131 | if (!s) | |
1132 | return -ENOMEM; | |
1133 | ||
1134 | trace_seq_init(s); | |
1135 | ||
1136 | func(s); | |
1137 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
1138 | ||
1139 | kfree(s); | |
1140 | ||
1141 | return r; | |
1142 | } | |
1143 | ||
15075cac SR |
1144 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
1145 | static int ftrace_event_set_open(struct inode *inode, struct file *file); | |
1146 | ||
b77e38aa SR |
1147 | static const struct seq_operations show_event_seq_ops = { |
1148 | .start = t_start, | |
1149 | .next = t_next, | |
1150 | .show = t_show, | |
1151 | .stop = t_stop, | |
1152 | }; | |
1153 | ||
1154 | static const struct seq_operations show_set_event_seq_ops = { | |
1155 | .start = s_start, | |
1156 | .next = s_next, | |
1157 | .show = t_show, | |
1158 | .stop = t_stop, | |
1159 | }; | |
1160 | ||
2314c4ae | 1161 | static const struct file_operations ftrace_avail_fops = { |
15075cac | 1162 | .open = ftrace_event_avail_open, |
2314c4ae SR |
1163 | .read = seq_read, |
1164 | .llseek = seq_lseek, | |
1165 | .release = seq_release, | |
1166 | }; | |
1167 | ||
b77e38aa | 1168 | static const struct file_operations ftrace_set_event_fops = { |
15075cac | 1169 | .open = ftrace_event_set_open, |
b77e38aa SR |
1170 | .read = seq_read, |
1171 | .write = ftrace_event_write, | |
1172 | .llseek = seq_lseek, | |
1173 | .release = seq_release, | |
1174 | }; | |
1175 | ||
1473e441 SR |
1176 | static const struct file_operations ftrace_enable_fops = { |
1177 | .open = tracing_open_generic, | |
1178 | .read = event_enable_read, | |
1179 | .write = event_enable_write, | |
6038f373 | 1180 | .llseek = default_llseek, |
1473e441 SR |
1181 | }; |
1182 | ||
981d081e | 1183 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
1184 | .open = trace_format_open, |
1185 | .read = seq_read, | |
1186 | .llseek = seq_lseek, | |
1187 | .release = seq_release, | |
981d081e SR |
1188 | }; |
1189 | ||
23725aee PZ |
1190 | static const struct file_operations ftrace_event_id_fops = { |
1191 | .open = tracing_open_generic, | |
1192 | .read = event_id_read, | |
6038f373 | 1193 | .llseek = default_llseek, |
23725aee PZ |
1194 | }; |
1195 | ||
7ce7e424 TZ |
1196 | static const struct file_operations ftrace_event_filter_fops = { |
1197 | .open = tracing_open_generic, | |
1198 | .read = event_filter_read, | |
1199 | .write = event_filter_write, | |
6038f373 | 1200 | .llseek = default_llseek, |
7ce7e424 TZ |
1201 | }; |
1202 | ||
cfb180f3 | 1203 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 1204 | .open = subsystem_open, |
cfb180f3 TZ |
1205 | .read = subsystem_filter_read, |
1206 | .write = subsystem_filter_write, | |
6038f373 | 1207 | .llseek = default_llseek, |
e9dbfae5 | 1208 | .release = subsystem_release, |
cfb180f3 TZ |
1209 | }; |
1210 | ||
8ae79a13 | 1211 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 1212 | .open = subsystem_open, |
8ae79a13 SR |
1213 | .read = system_enable_read, |
1214 | .write = system_enable_write, | |
6038f373 | 1215 | .llseek = default_llseek, |
40ee4dff | 1216 | .release = subsystem_release, |
8ae79a13 SR |
1217 | }; |
1218 | ||
ae63b31e SR |
1219 | static const struct file_operations ftrace_tr_enable_fops = { |
1220 | .open = system_tr_open, | |
1221 | .read = system_enable_read, | |
1222 | .write = system_enable_write, | |
1223 | .llseek = default_llseek, | |
1224 | .release = subsystem_release, | |
1225 | }; | |
1226 | ||
d1b182a8 SR |
1227 | static const struct file_operations ftrace_show_header_fops = { |
1228 | .open = tracing_open_generic, | |
1229 | .read = show_header, | |
6038f373 | 1230 | .llseek = default_llseek, |
d1b182a8 SR |
1231 | }; |
1232 | ||
ae63b31e SR |
1233 | static int |
1234 | ftrace_event_open(struct inode *inode, struct file *file, | |
1235 | const struct seq_operations *seq_ops) | |
1473e441 | 1236 | { |
ae63b31e SR |
1237 | struct seq_file *m; |
1238 | int ret; | |
1473e441 | 1239 | |
ae63b31e SR |
1240 | ret = seq_open(file, seq_ops); |
1241 | if (ret < 0) | |
1242 | return ret; | |
1243 | m = file->private_data; | |
1244 | /* copy tr over to seq ops */ | |
1245 | m->private = inode->i_private; | |
1473e441 | 1246 | |
ae63b31e | 1247 | return ret; |
1473e441 SR |
1248 | } |
1249 | ||
15075cac SR |
1250 | static int |
1251 | ftrace_event_avail_open(struct inode *inode, struct file *file) | |
1252 | { | |
1253 | const struct seq_operations *seq_ops = &show_event_seq_ops; | |
1254 | ||
ae63b31e | 1255 | return ftrace_event_open(inode, file, seq_ops); |
15075cac SR |
1256 | } |
1257 | ||
1258 | static int | |
1259 | ftrace_event_set_open(struct inode *inode, struct file *file) | |
1260 | { | |
1261 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; | |
ae63b31e | 1262 | struct trace_array *tr = inode->i_private; |
15075cac SR |
1263 | |
1264 | if ((file->f_mode & FMODE_WRITE) && | |
1265 | (file->f_flags & O_TRUNC)) | |
ae63b31e | 1266 | ftrace_clear_events(tr); |
15075cac | 1267 | |
ae63b31e SR |
1268 | return ftrace_event_open(inode, file, seq_ops); |
1269 | } | |
1270 | ||
1271 | static struct event_subsystem * | |
1272 | create_new_subsystem(const char *name) | |
1273 | { | |
1274 | struct event_subsystem *system; | |
1275 | ||
1276 | /* need to create new entry */ | |
1277 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1278 | if (!system) | |
1279 | return NULL; | |
1280 | ||
1281 | system->ref_count = 1; | |
92edca07 | 1282 | system->name = name; |
ae63b31e SR |
1283 | |
1284 | system->filter = NULL; | |
1285 | ||
1286 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); | |
1287 | if (!system->filter) | |
1288 | goto out_free; | |
1289 | ||
1290 | list_add(&system->list, &event_subsystems); | |
1291 | ||
1292 | return system; | |
1293 | ||
1294 | out_free: | |
ae63b31e SR |
1295 | kfree(system); |
1296 | return NULL; | |
15075cac SR |
1297 | } |
1298 | ||
6ecc2d1c | 1299 | static struct dentry * |
ae63b31e SR |
1300 | event_subsystem_dir(struct trace_array *tr, const char *name, |
1301 | struct ftrace_event_file *file, struct dentry *parent) | |
6ecc2d1c | 1302 | { |
ae63b31e | 1303 | struct ftrace_subsystem_dir *dir; |
6ecc2d1c | 1304 | struct event_subsystem *system; |
e1112b4d | 1305 | struct dentry *entry; |
6ecc2d1c SR |
1306 | |
1307 | /* First see if we did not already create this dir */ | |
ae63b31e SR |
1308 | list_for_each_entry(dir, &tr->systems, list) { |
1309 | system = dir->subsystem; | |
dc82ec98 | 1310 | if (strcmp(system->name, name) == 0) { |
ae63b31e SR |
1311 | dir->nr_events++; |
1312 | file->system = dir; | |
1313 | return dir->entry; | |
dc82ec98 | 1314 | } |
6ecc2d1c SR |
1315 | } |
1316 | ||
ae63b31e SR |
1317 | /* Now see if the system itself exists. */ |
1318 | list_for_each_entry(system, &event_subsystems, list) { | |
1319 | if (strcmp(system->name, name) == 0) | |
1320 | break; | |
6ecc2d1c | 1321 | } |
ae63b31e SR |
1322 | /* Reset system variable when not found */ |
1323 | if (&system->list == &event_subsystems) | |
1324 | system = NULL; | |
6ecc2d1c | 1325 | |
ae63b31e SR |
1326 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
1327 | if (!dir) | |
1328 | goto out_fail; | |
6ecc2d1c | 1329 | |
ae63b31e SR |
1330 | if (!system) { |
1331 | system = create_new_subsystem(name); | |
1332 | if (!system) | |
1333 | goto out_free; | |
1334 | } else | |
1335 | __get_system(system); | |
1336 | ||
1337 | dir->entry = debugfs_create_dir(name, parent); | |
1338 | if (!dir->entry) { | |
1339 | pr_warning("Failed to create system directory %s\n", name); | |
1340 | __put_system(system); | |
1341 | goto out_free; | |
6d723736 SR |
1342 | } |
1343 | ||
ae63b31e SR |
1344 | dir->tr = tr; |
1345 | dir->ref_count = 1; | |
1346 | dir->nr_events = 1; | |
1347 | dir->subsystem = system; | |
1348 | file->system = dir; | |
8b372562 | 1349 | |
ae63b31e | 1350 | entry = debugfs_create_file("filter", 0644, dir->entry, dir, |
e1112b4d | 1351 | &ftrace_subsystem_filter_fops); |
8b372562 TZ |
1352 | if (!entry) { |
1353 | kfree(system->filter); | |
1354 | system->filter = NULL; | |
ae63b31e | 1355 | pr_warning("Could not create debugfs '%s/filter' entry\n", name); |
8b372562 | 1356 | } |
e1112b4d | 1357 | |
ae63b31e | 1358 | trace_create_file("enable", 0644, dir->entry, dir, |
f3f3f009 | 1359 | &ftrace_system_enable_fops); |
8ae79a13 | 1360 | |
ae63b31e SR |
1361 | list_add(&dir->list, &tr->systems); |
1362 | ||
1363 | return dir->entry; | |
1364 | ||
1365 | out_free: | |
1366 | kfree(dir); | |
1367 | out_fail: | |
1368 | /* Only print this message if failed on memory allocation */ | |
1369 | if (!dir || !system) | |
1370 | pr_warning("No memory to create event subsystem %s\n", | |
1371 | name); | |
1372 | return NULL; | |
6ecc2d1c SR |
1373 | } |
1374 | ||
1473e441 | 1375 | static int |
ae63b31e SR |
1376 | event_create_dir(struct dentry *parent, |
1377 | struct ftrace_event_file *file, | |
701970b3 SR |
1378 | const struct file_operations *id, |
1379 | const struct file_operations *enable, | |
1380 | const struct file_operations *filter, | |
1381 | const struct file_operations *format) | |
1473e441 | 1382 | { |
ae63b31e SR |
1383 | struct ftrace_event_call *call = file->event_call; |
1384 | struct trace_array *tr = file->tr; | |
2e33af02 | 1385 | struct list_head *head; |
ae63b31e | 1386 | struct dentry *d_events; |
fd994989 | 1387 | int ret; |
1473e441 | 1388 | |
6ecc2d1c SR |
1389 | /* |
1390 | * If the trace point header did not define TRACE_SYSTEM | |
1391 | * then the system would be called "TRACE_SYSTEM". | |
1392 | */ | |
ae63b31e SR |
1393 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { |
1394 | d_events = event_subsystem_dir(tr, call->class->system, file, parent); | |
1395 | if (!d_events) | |
1396 | return -ENOMEM; | |
1397 | } else | |
1398 | d_events = parent; | |
1399 | ||
1400 | file->dir = debugfs_create_dir(call->name, d_events); | |
1401 | if (!file->dir) { | |
1402 | pr_warning("Could not create debugfs '%s' directory\n", | |
1403 | call->name); | |
1473e441 SR |
1404 | return -1; |
1405 | } | |
1406 | ||
9b63776f | 1407 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
ae63b31e | 1408 | trace_create_file("enable", 0644, file->dir, file, |
f3f3f009 | 1409 | enable); |
1473e441 | 1410 | |
2239291a | 1411 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 1412 | if (call->event.type && call->class->reg) |
ae63b31e | 1413 | trace_create_file("id", 0444, file->dir, call, |
f3f3f009 | 1414 | id); |
2239291a | 1415 | #endif |
23725aee | 1416 | |
c9d932cf LZ |
1417 | /* |
1418 | * Other events may have the same class. Only update | |
1419 | * the fields if they are not already defined. | |
1420 | */ | |
1421 | head = trace_get_fields(call); | |
1422 | if (list_empty(head)) { | |
1423 | ret = call->class->define_fields(call); | |
1424 | if (ret < 0) { | |
1425 | pr_warning("Could not initialize trace point" | |
1426 | " events/%s\n", call->name); | |
ae63b31e | 1427 | return -1; |
cf027f64 TZ |
1428 | } |
1429 | } | |
ae63b31e | 1430 | trace_create_file("filter", 0644, file->dir, call, |
c9d932cf | 1431 | filter); |
cf027f64 | 1432 | |
ae63b31e | 1433 | trace_create_file("format", 0444, file->dir, call, |
f3f3f009 | 1434 | format); |
6d723736 SR |
1435 | |
1436 | return 0; | |
1437 | } | |
1438 | ||
ae63b31e SR |
1439 | static void remove_subsystem(struct ftrace_subsystem_dir *dir) |
1440 | { | |
1441 | if (!dir) | |
1442 | return; | |
1443 | ||
1444 | if (!--dir->nr_events) { | |
1445 | debugfs_remove_recursive(dir->entry); | |
1446 | list_del(&dir->list); | |
1447 | __put_system_dir(dir); | |
1448 | } | |
1449 | } | |
1450 | ||
1451 | static void remove_event_from_tracers(struct ftrace_event_call *call) | |
1452 | { | |
1453 | struct ftrace_event_file *file; | |
1454 | struct trace_array *tr; | |
1455 | ||
1456 | do_for_each_event_file_safe(tr, file) { | |
1457 | ||
1458 | if (file->event_call != call) | |
1459 | continue; | |
1460 | ||
1461 | list_del(&file->list); | |
1462 | debugfs_remove_recursive(file->dir); | |
1463 | remove_subsystem(file->system); | |
d1a29143 | 1464 | kmem_cache_free(file_cachep, file); |
ae63b31e SR |
1465 | |
1466 | /* | |
1467 | * The do_for_each_event_file_safe() is | |
1468 | * a double loop. After finding the call for this | |
1469 | * trace_array, we use break to jump to the next | |
1470 | * trace_array. | |
1471 | */ | |
1472 | break; | |
1473 | } while_for_each_event_file(); | |
1474 | } | |
1475 | ||
8781915a EG |
1476 | static void event_remove(struct ftrace_event_call *call) |
1477 | { | |
ae63b31e SR |
1478 | struct trace_array *tr; |
1479 | struct ftrace_event_file *file; | |
1480 | ||
1481 | do_for_each_event_file(tr, file) { | |
1482 | if (file->event_call != call) | |
1483 | continue; | |
1484 | ftrace_event_enable_disable(file, 0); | |
1485 | /* | |
1486 | * The do_for_each_event_file() is | |
1487 | * a double loop. After finding the call for this | |
1488 | * trace_array, we use break to jump to the next | |
1489 | * trace_array. | |
1490 | */ | |
1491 | break; | |
1492 | } while_for_each_event_file(); | |
1493 | ||
8781915a EG |
1494 | if (call->event.funcs) |
1495 | __unregister_ftrace_event(&call->event); | |
ae63b31e | 1496 | remove_event_from_tracers(call); |
8781915a EG |
1497 | list_del(&call->list); |
1498 | } | |
1499 | ||
1500 | static int event_init(struct ftrace_event_call *call) | |
1501 | { | |
1502 | int ret = 0; | |
1503 | ||
1504 | if (WARN_ON(!call->name)) | |
1505 | return -EINVAL; | |
1506 | ||
1507 | if (call->class->raw_init) { | |
1508 | ret = call->class->raw_init(call); | |
1509 | if (ret < 0 && ret != -ENOSYS) | |
1510 | pr_warn("Could not initialize trace events/%s\n", | |
1511 | call->name); | |
1512 | } | |
1513 | ||
1514 | return ret; | |
1515 | } | |
1516 | ||
67ead0a6 | 1517 | static int |
ae63b31e | 1518 | __register_event(struct ftrace_event_call *call, struct module *mod) |
bd1a5c84 | 1519 | { |
bd1a5c84 | 1520 | int ret; |
6d723736 | 1521 | |
8781915a EG |
1522 | ret = event_init(call); |
1523 | if (ret < 0) | |
1524 | return ret; | |
701970b3 | 1525 | |
ae63b31e | 1526 | list_add(&call->list, &ftrace_events); |
67ead0a6 | 1527 | call->mod = mod; |
88f70d75 | 1528 | |
ae63b31e | 1529 | return 0; |
bd1a5c84 MH |
1530 | } |
1531 | ||
da511bf3 SRRH |
1532 | static struct ftrace_event_file * |
1533 | trace_create_new_event(struct ftrace_event_call *call, | |
1534 | struct trace_array *tr) | |
1535 | { | |
1536 | struct ftrace_event_file *file; | |
1537 | ||
1538 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); | |
1539 | if (!file) | |
1540 | return NULL; | |
1541 | ||
1542 | file->event_call = call; | |
1543 | file->tr = tr; | |
1544 | atomic_set(&file->sm_ref, 0); | |
1545 | list_add(&file->list, &tr->events); | |
1546 | ||
1547 | return file; | |
1548 | } | |
1549 | ||
ae63b31e SR |
1550 | /* Add an event to a trace directory */ |
1551 | static int | |
1552 | __trace_add_new_event(struct ftrace_event_call *call, | |
1553 | struct trace_array *tr, | |
1554 | const struct file_operations *id, | |
1555 | const struct file_operations *enable, | |
1556 | const struct file_operations *filter, | |
1557 | const struct file_operations *format) | |
1558 | { | |
1559 | struct ftrace_event_file *file; | |
1560 | ||
da511bf3 | 1561 | file = trace_create_new_event(call, tr); |
ae63b31e SR |
1562 | if (!file) |
1563 | return -ENOMEM; | |
1564 | ||
ae63b31e SR |
1565 | return event_create_dir(tr->event_dir, file, id, enable, filter, format); |
1566 | } | |
1567 | ||
77248221 SR |
1568 | /* |
1569 | * Just create a decriptor for early init. A descriptor is required | |
1570 | * for enabling events at boot. We want to enable events before | |
1571 | * the filesystem is initialized. | |
1572 | */ | |
1573 | static __init int | |
1574 | __trace_early_add_new_event(struct ftrace_event_call *call, | |
1575 | struct trace_array *tr) | |
1576 | { | |
1577 | struct ftrace_event_file *file; | |
1578 | ||
da511bf3 | 1579 | file = trace_create_new_event(call, tr); |
77248221 SR |
1580 | if (!file) |
1581 | return -ENOMEM; | |
1582 | ||
77248221 SR |
1583 | return 0; |
1584 | } | |
1585 | ||
ae63b31e SR |
1586 | struct ftrace_module_file_ops; |
1587 | static void __add_event_to_tracers(struct ftrace_event_call *call, | |
1588 | struct ftrace_module_file_ops *file_ops); | |
1589 | ||
bd1a5c84 MH |
1590 | /* Add an additional event_call dynamically */ |
1591 | int trace_add_event_call(struct ftrace_event_call *call) | |
1592 | { | |
1593 | int ret; | |
1594 | mutex_lock(&event_mutex); | |
701970b3 | 1595 | |
ae63b31e SR |
1596 | ret = __register_event(call, NULL); |
1597 | if (ret >= 0) | |
1598 | __add_event_to_tracers(call, NULL); | |
a2ca5e03 | 1599 | |
ae63b31e SR |
1600 | mutex_unlock(&event_mutex); |
1601 | return ret; | |
a2ca5e03 FW |
1602 | } |
1603 | ||
4fead8e4 | 1604 | /* |
52f6ad6d | 1605 | * Must be called under locking both of event_mutex and trace_event_sem. |
4fead8e4 | 1606 | */ |
bd1a5c84 MH |
1607 | static void __trace_remove_event_call(struct ftrace_event_call *call) |
1608 | { | |
8781915a | 1609 | event_remove(call); |
bd1a5c84 MH |
1610 | trace_destroy_fields(call); |
1611 | destroy_preds(call); | |
bd1a5c84 MH |
1612 | } |
1613 | ||
1614 | /* Remove an event_call */ | |
1615 | void trace_remove_event_call(struct ftrace_event_call *call) | |
1616 | { | |
1617 | mutex_lock(&event_mutex); | |
52f6ad6d | 1618 | down_write(&trace_event_sem); |
bd1a5c84 | 1619 | __trace_remove_event_call(call); |
52f6ad6d | 1620 | up_write(&trace_event_sem); |
bd1a5c84 MH |
1621 | mutex_unlock(&event_mutex); |
1622 | } | |
1623 | ||
1624 | #define for_each_event(event, start, end) \ | |
1625 | for (event = start; \ | |
1626 | (unsigned long)event < (unsigned long)end; \ | |
1627 | event++) | |
1628 | ||
1629 | #ifdef CONFIG_MODULES | |
1630 | ||
1631 | static LIST_HEAD(ftrace_module_file_list); | |
1632 | ||
1633 | /* | |
1634 | * Modules must own their file_operations to keep up with | |
1635 | * reference counting. | |
1636 | */ | |
1637 | struct ftrace_module_file_ops { | |
1638 | struct list_head list; | |
1639 | struct module *mod; | |
1640 | struct file_operations id; | |
1641 | struct file_operations enable; | |
1642 | struct file_operations format; | |
1643 | struct file_operations filter; | |
1644 | }; | |
1645 | ||
315326c1 SRRH |
1646 | static struct ftrace_module_file_ops * |
1647 | find_ftrace_file_ops(struct ftrace_module_file_ops *file_ops, struct module *mod) | |
ae63b31e | 1648 | { |
315326c1 SRRH |
1649 | /* |
1650 | * As event_calls are added in groups by module, | |
1651 | * when we find one file_ops, we don't need to search for | |
1652 | * each call in that module, as the rest should be the | |
1653 | * same. Only search for a new one if the last one did | |
1654 | * not match. | |
1655 | */ | |
1656 | if (file_ops && mod == file_ops->mod) | |
1657 | return file_ops; | |
ae63b31e SR |
1658 | |
1659 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1660 | if (file_ops->mod == mod) | |
1661 | return file_ops; | |
1662 | } | |
1663 | return NULL; | |
1664 | } | |
1665 | ||
701970b3 SR |
1666 | static struct ftrace_module_file_ops * |
1667 | trace_create_file_ops(struct module *mod) | |
1668 | { | |
1669 | struct ftrace_module_file_ops *file_ops; | |
1670 | ||
1671 | /* | |
1672 | * This is a bit of a PITA. To allow for correct reference | |
1673 | * counting, modules must "own" their file_operations. | |
1674 | * To do this, we allocate the file operations that will be | |
1675 | * used in the event directory. | |
1676 | */ | |
1677 | ||
1678 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1679 | if (!file_ops) | |
1680 | return NULL; | |
1681 | ||
1682 | file_ops->mod = mod; | |
1683 | ||
1684 | file_ops->id = ftrace_event_id_fops; | |
1685 | file_ops->id.owner = mod; | |
1686 | ||
1687 | file_ops->enable = ftrace_enable_fops; | |
1688 | file_ops->enable.owner = mod; | |
1689 | ||
1690 | file_ops->filter = ftrace_event_filter_fops; | |
1691 | file_ops->filter.owner = mod; | |
1692 | ||
1693 | file_ops->format = ftrace_event_format_fops; | |
1694 | file_ops->format.owner = mod; | |
1695 | ||
1696 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1697 | ||
1698 | return file_ops; | |
1699 | } | |
1700 | ||
6d723736 SR |
1701 | static void trace_module_add_events(struct module *mod) |
1702 | { | |
701970b3 | 1703 | struct ftrace_module_file_ops *file_ops = NULL; |
e4a9ea5e | 1704 | struct ftrace_event_call **call, **start, **end; |
6d723736 SR |
1705 | |
1706 | start = mod->trace_events; | |
1707 | end = mod->trace_events + mod->num_trace_events; | |
1708 | ||
1709 | if (start == end) | |
1710 | return; | |
1711 | ||
67ead0a6 LZ |
1712 | file_ops = trace_create_file_ops(mod); |
1713 | if (!file_ops) | |
6d723736 SR |
1714 | return; |
1715 | ||
1716 | for_each_event(call, start, end) { | |
ae63b31e SR |
1717 | __register_event(*call, mod); |
1718 | __add_event_to_tracers(*call, file_ops); | |
6d723736 SR |
1719 | } |
1720 | } | |
1721 | ||
1722 | static void trace_module_remove_events(struct module *mod) | |
1723 | { | |
701970b3 | 1724 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1725 | struct ftrace_event_call *call, *p; |
575380da | 1726 | bool clear_trace = false; |
6d723736 | 1727 | |
52f6ad6d | 1728 | down_write(&trace_event_sem); |
6d723736 SR |
1729 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1730 | if (call->mod == mod) { | |
575380da SRRH |
1731 | if (call->flags & TRACE_EVENT_FL_WAS_ENABLED) |
1732 | clear_trace = true; | |
bd1a5c84 | 1733 | __trace_remove_event_call(call); |
6d723736 SR |
1734 | } |
1735 | } | |
701970b3 SR |
1736 | |
1737 | /* Now free the file_operations */ | |
1738 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1739 | if (file_ops->mod == mod) | |
1740 | break; | |
1741 | } | |
1742 | if (&file_ops->list != &ftrace_module_file_list) { | |
1743 | list_del(&file_ops->list); | |
1744 | kfree(file_ops); | |
1745 | } | |
52f6ad6d | 1746 | up_write(&trace_event_sem); |
9456f0fa SR |
1747 | |
1748 | /* | |
1749 | * It is safest to reset the ring buffer if the module being unloaded | |
873c642f SRRH |
1750 | * registered any events that were used. The only worry is if |
1751 | * a new module gets loaded, and takes on the same id as the events | |
1752 | * of this module. When printing out the buffer, traced events left | |
1753 | * over from this module may be passed to the new module events and | |
1754 | * unexpected results may occur. | |
9456f0fa | 1755 | */ |
575380da | 1756 | if (clear_trace) |
873c642f | 1757 | tracing_reset_all_online_cpus(); |
6d723736 SR |
1758 | } |
1759 | ||
61f919a1 SR |
1760 | static int trace_module_notify(struct notifier_block *self, |
1761 | unsigned long val, void *data) | |
6d723736 SR |
1762 | { |
1763 | struct module *mod = data; | |
1764 | ||
1765 | mutex_lock(&event_mutex); | |
1766 | switch (val) { | |
1767 | case MODULE_STATE_COMING: | |
1768 | trace_module_add_events(mod); | |
1769 | break; | |
1770 | case MODULE_STATE_GOING: | |
1771 | trace_module_remove_events(mod); | |
1772 | break; | |
1773 | } | |
1774 | mutex_unlock(&event_mutex); | |
fd994989 | 1775 | |
1473e441 SR |
1776 | return 0; |
1777 | } | |
315326c1 SRRH |
1778 | |
1779 | static int | |
1780 | __trace_add_new_mod_event(struct ftrace_event_call *call, | |
1781 | struct trace_array *tr, | |
1782 | struct ftrace_module_file_ops *file_ops) | |
1783 | { | |
1784 | return __trace_add_new_event(call, tr, | |
1785 | &file_ops->id, &file_ops->enable, | |
1786 | &file_ops->filter, &file_ops->format); | |
1787 | } | |
1788 | ||
61f919a1 | 1789 | #else |
315326c1 SRRH |
1790 | static inline struct ftrace_module_file_ops * |
1791 | find_ftrace_file_ops(struct ftrace_module_file_ops *file_ops, struct module *mod) | |
ae63b31e SR |
1792 | { |
1793 | return NULL; | |
1794 | } | |
315326c1 SRRH |
1795 | static inline int trace_module_notify(struct notifier_block *self, |
1796 | unsigned long val, void *data) | |
61f919a1 SR |
1797 | { |
1798 | return 0; | |
1799 | } | |
315326c1 SRRH |
1800 | static inline int |
1801 | __trace_add_new_mod_event(struct ftrace_event_call *call, | |
1802 | struct trace_array *tr, | |
1803 | struct ftrace_module_file_ops *file_ops) | |
1804 | { | |
1805 | return -ENODEV; | |
1806 | } | |
61f919a1 | 1807 | #endif /* CONFIG_MODULES */ |
1473e441 | 1808 | |
ae63b31e SR |
1809 | /* Create a new event directory structure for a trace directory. */ |
1810 | static void | |
1811 | __trace_add_event_dirs(struct trace_array *tr) | |
1812 | { | |
1813 | struct ftrace_module_file_ops *file_ops = NULL; | |
1814 | struct ftrace_event_call *call; | |
1815 | int ret; | |
1816 | ||
1817 | list_for_each_entry(call, &ftrace_events, list) { | |
1818 | if (call->mod) { | |
1819 | /* | |
1820 | * Directories for events by modules need to | |
1821 | * keep module ref counts when opened (as we don't | |
1822 | * want the module to disappear when reading one | |
1823 | * of these files). The file_ops keep account of | |
1824 | * the module ref count. | |
ae63b31e | 1825 | */ |
315326c1 | 1826 | file_ops = find_ftrace_file_ops(file_ops, call->mod); |
ae63b31e SR |
1827 | if (!file_ops) |
1828 | continue; /* Warn? */ | |
315326c1 | 1829 | ret = __trace_add_new_mod_event(call, tr, file_ops); |
ae63b31e SR |
1830 | if (ret < 0) |
1831 | pr_warning("Could not create directory for event %s\n", | |
1832 | call->name); | |
1833 | continue; | |
1834 | } | |
1835 | ret = __trace_add_new_event(call, tr, | |
1836 | &ftrace_event_id_fops, | |
1837 | &ftrace_enable_fops, | |
1838 | &ftrace_event_filter_fops, | |
1839 | &ftrace_event_format_fops); | |
1840 | if (ret < 0) | |
1841 | pr_warning("Could not create directory for event %s\n", | |
1842 | call->name); | |
1843 | } | |
1844 | } | |
1845 | ||
3cd715de SRRH |
1846 | #ifdef CONFIG_DYNAMIC_FTRACE |
1847 | ||
1848 | /* Avoid typos */ | |
1849 | #define ENABLE_EVENT_STR "enable_event" | |
1850 | #define DISABLE_EVENT_STR "disable_event" | |
1851 | ||
1852 | struct event_probe_data { | |
1853 | struct ftrace_event_file *file; | |
1854 | unsigned long count; | |
1855 | int ref; | |
1856 | bool enable; | |
1857 | }; | |
1858 | ||
1859 | static struct ftrace_event_file * | |
1860 | find_event_file(struct trace_array *tr, const char *system, const char *event) | |
1861 | { | |
1862 | struct ftrace_event_file *file; | |
1863 | struct ftrace_event_call *call; | |
1864 | ||
1865 | list_for_each_entry(file, &tr->events, list) { | |
1866 | ||
1867 | call = file->event_call; | |
1868 | ||
1869 | if (!call->name || !call->class || !call->class->reg) | |
1870 | continue; | |
1871 | ||
1872 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) | |
1873 | continue; | |
1874 | ||
1875 | if (strcmp(event, call->name) == 0 && | |
1876 | strcmp(system, call->class->system) == 0) | |
1877 | return file; | |
1878 | } | |
1879 | return NULL; | |
1880 | } | |
1881 | ||
1882 | static void | |
1883 | event_enable_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
1884 | { | |
1885 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
1886 | struct event_probe_data *data = *pdata; | |
1887 | ||
1888 | if (!data) | |
1889 | return; | |
1890 | ||
1891 | if (data->enable) | |
1892 | clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &data->file->flags); | |
1893 | else | |
1894 | set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &data->file->flags); | |
1895 | } | |
1896 | ||
1897 | static void | |
1898 | event_enable_count_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
1899 | { | |
1900 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
1901 | struct event_probe_data *data = *pdata; | |
1902 | ||
1903 | if (!data) | |
1904 | return; | |
1905 | ||
1906 | if (!data->count) | |
1907 | return; | |
1908 | ||
1909 | /* Skip if the event is in a state we want to switch to */ | |
1910 | if (data->enable == !(data->file->flags & FTRACE_EVENT_FL_SOFT_DISABLED)) | |
1911 | return; | |
1912 | ||
1913 | if (data->count != -1) | |
1914 | (data->count)--; | |
1915 | ||
1916 | event_enable_probe(ip, parent_ip, _data); | |
1917 | } | |
1918 | ||
1919 | static int | |
1920 | event_enable_print(struct seq_file *m, unsigned long ip, | |
1921 | struct ftrace_probe_ops *ops, void *_data) | |
1922 | { | |
1923 | struct event_probe_data *data = _data; | |
1924 | ||
1925 | seq_printf(m, "%ps:", (void *)ip); | |
1926 | ||
1927 | seq_printf(m, "%s:%s:%s", | |
1928 | data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR, | |
1929 | data->file->event_call->class->system, | |
1930 | data->file->event_call->name); | |
1931 | ||
1932 | if (data->count == -1) | |
1933 | seq_printf(m, ":unlimited\n"); | |
1934 | else | |
1935 | seq_printf(m, ":count=%ld\n", data->count); | |
1936 | ||
1937 | return 0; | |
1938 | } | |
1939 | ||
1940 | static int | |
1941 | event_enable_init(struct ftrace_probe_ops *ops, unsigned long ip, | |
1942 | void **_data) | |
1943 | { | |
1944 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
1945 | struct event_probe_data *data = *pdata; | |
1946 | ||
1947 | data->ref++; | |
1948 | return 0; | |
1949 | } | |
1950 | ||
1951 | static void | |
1952 | event_enable_free(struct ftrace_probe_ops *ops, unsigned long ip, | |
1953 | void **_data) | |
1954 | { | |
1955 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
1956 | struct event_probe_data *data = *pdata; | |
1957 | ||
1958 | if (WARN_ON_ONCE(data->ref <= 0)) | |
1959 | return; | |
1960 | ||
1961 | data->ref--; | |
1962 | if (!data->ref) { | |
1963 | /* Remove the SOFT_MODE flag */ | |
1964 | __ftrace_event_enable_disable(data->file, 0, 1); | |
1965 | module_put(data->file->event_call->mod); | |
1966 | kfree(data); | |
1967 | } | |
1968 | *pdata = NULL; | |
1969 | } | |
1970 | ||
1971 | static struct ftrace_probe_ops event_enable_probe_ops = { | |
1972 | .func = event_enable_probe, | |
1973 | .print = event_enable_print, | |
1974 | .init = event_enable_init, | |
1975 | .free = event_enable_free, | |
1976 | }; | |
1977 | ||
1978 | static struct ftrace_probe_ops event_enable_count_probe_ops = { | |
1979 | .func = event_enable_count_probe, | |
1980 | .print = event_enable_print, | |
1981 | .init = event_enable_init, | |
1982 | .free = event_enable_free, | |
1983 | }; | |
1984 | ||
1985 | static struct ftrace_probe_ops event_disable_probe_ops = { | |
1986 | .func = event_enable_probe, | |
1987 | .print = event_enable_print, | |
1988 | .init = event_enable_init, | |
1989 | .free = event_enable_free, | |
1990 | }; | |
1991 | ||
1992 | static struct ftrace_probe_ops event_disable_count_probe_ops = { | |
1993 | .func = event_enable_count_probe, | |
1994 | .print = event_enable_print, | |
1995 | .init = event_enable_init, | |
1996 | .free = event_enable_free, | |
1997 | }; | |
1998 | ||
1999 | static int | |
2000 | event_enable_func(struct ftrace_hash *hash, | |
2001 | char *glob, char *cmd, char *param, int enabled) | |
2002 | { | |
2003 | struct trace_array *tr = top_trace_array(); | |
2004 | struct ftrace_event_file *file; | |
2005 | struct ftrace_probe_ops *ops; | |
2006 | struct event_probe_data *data; | |
2007 | const char *system; | |
2008 | const char *event; | |
2009 | char *number; | |
2010 | bool enable; | |
2011 | int ret; | |
2012 | ||
2013 | /* hash funcs only work with set_ftrace_filter */ | |
2014 | if (!enabled) | |
2015 | return -EINVAL; | |
2016 | ||
2017 | if (!param) | |
2018 | return -EINVAL; | |
2019 | ||
2020 | system = strsep(¶m, ":"); | |
2021 | if (!param) | |
2022 | return -EINVAL; | |
2023 | ||
2024 | event = strsep(¶m, ":"); | |
2025 | ||
2026 | mutex_lock(&event_mutex); | |
2027 | ||
2028 | ret = -EINVAL; | |
2029 | file = find_event_file(tr, system, event); | |
2030 | if (!file) | |
2031 | goto out; | |
2032 | ||
2033 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; | |
2034 | ||
2035 | if (enable) | |
2036 | ops = param ? &event_enable_count_probe_ops : &event_enable_probe_ops; | |
2037 | else | |
2038 | ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops; | |
2039 | ||
2040 | if (glob[0] == '!') { | |
2041 | unregister_ftrace_function_probe_func(glob+1, ops); | |
2042 | ret = 0; | |
2043 | goto out; | |
2044 | } | |
2045 | ||
2046 | ret = -ENOMEM; | |
2047 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
2048 | if (!data) | |
2049 | goto out; | |
2050 | ||
2051 | data->enable = enable; | |
2052 | data->count = -1; | |
2053 | data->file = file; | |
2054 | ||
2055 | if (!param) | |
2056 | goto out_reg; | |
2057 | ||
2058 | number = strsep(¶m, ":"); | |
2059 | ||
2060 | ret = -EINVAL; | |
2061 | if (!strlen(number)) | |
2062 | goto out_free; | |
2063 | ||
2064 | /* | |
2065 | * We use the callback data field (which is a pointer) | |
2066 | * as our counter. | |
2067 | */ | |
2068 | ret = kstrtoul(number, 0, &data->count); | |
2069 | if (ret) | |
2070 | goto out_free; | |
2071 | ||
2072 | out_reg: | |
2073 | /* Don't let event modules unload while probe registered */ | |
2074 | ret = try_module_get(file->event_call->mod); | |
2075 | if (!ret) | |
2076 | goto out_free; | |
2077 | ||
2078 | ret = __ftrace_event_enable_disable(file, 1, 1); | |
2079 | if (ret < 0) | |
2080 | goto out_put; | |
2081 | ret = register_ftrace_function_probe(glob, ops, data); | |
ff305ded SRRH |
2082 | /* |
2083 | * The above returns on success the # of functions enabled, | |
2084 | * but if it didn't find any functions it returns zero. | |
2085 | * Consider no functions a failure too. | |
2086 | */ | |
a5b85bd1 MH |
2087 | if (!ret) { |
2088 | ret = -ENOENT; | |
3cd715de | 2089 | goto out_disable; |
ff305ded SRRH |
2090 | } else if (ret < 0) |
2091 | goto out_disable; | |
2092 | /* Just return zero, not the number of enabled functions */ | |
2093 | ret = 0; | |
3cd715de SRRH |
2094 | out: |
2095 | mutex_unlock(&event_mutex); | |
2096 | return ret; | |
2097 | ||
2098 | out_disable: | |
2099 | __ftrace_event_enable_disable(file, 0, 1); | |
2100 | out_put: | |
2101 | module_put(file->event_call->mod); | |
2102 | out_free: | |
2103 | kfree(data); | |
2104 | goto out; | |
2105 | } | |
2106 | ||
2107 | static struct ftrace_func_command event_enable_cmd = { | |
2108 | .name = ENABLE_EVENT_STR, | |
2109 | .func = event_enable_func, | |
2110 | }; | |
2111 | ||
2112 | static struct ftrace_func_command event_disable_cmd = { | |
2113 | .name = DISABLE_EVENT_STR, | |
2114 | .func = event_enable_func, | |
2115 | }; | |
2116 | ||
2117 | static __init int register_event_cmds(void) | |
2118 | { | |
2119 | int ret; | |
2120 | ||
2121 | ret = register_ftrace_command(&event_enable_cmd); | |
2122 | if (WARN_ON(ret < 0)) | |
2123 | return ret; | |
2124 | ret = register_ftrace_command(&event_disable_cmd); | |
2125 | if (WARN_ON(ret < 0)) | |
2126 | unregister_ftrace_command(&event_enable_cmd); | |
2127 | return ret; | |
2128 | } | |
2129 | #else | |
2130 | static inline int register_event_cmds(void) { return 0; } | |
2131 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
2132 | ||
77248221 SR |
2133 | /* |
2134 | * The top level array has already had its ftrace_event_file | |
2135 | * descriptors created in order to allow for early events to | |
2136 | * be recorded. This function is called after the debugfs has been | |
2137 | * initialized, and we now have to create the files associated | |
2138 | * to the events. | |
2139 | */ | |
2140 | static __init void | |
2141 | __trace_early_add_event_dirs(struct trace_array *tr) | |
2142 | { | |
2143 | struct ftrace_event_file *file; | |
2144 | int ret; | |
2145 | ||
2146 | ||
2147 | list_for_each_entry(file, &tr->events, list) { | |
2148 | ret = event_create_dir(tr->event_dir, file, | |
2149 | &ftrace_event_id_fops, | |
2150 | &ftrace_enable_fops, | |
2151 | &ftrace_event_filter_fops, | |
2152 | &ftrace_event_format_fops); | |
2153 | if (ret < 0) | |
2154 | pr_warning("Could not create directory for event %s\n", | |
2155 | file->event_call->name); | |
2156 | } | |
2157 | } | |
2158 | ||
2159 | /* | |
2160 | * For early boot up, the top trace array requires to have | |
2161 | * a list of events that can be enabled. This must be done before | |
2162 | * the filesystem is set up in order to allow events to be traced | |
2163 | * early. | |
2164 | */ | |
2165 | static __init void | |
2166 | __trace_early_add_events(struct trace_array *tr) | |
2167 | { | |
2168 | struct ftrace_event_call *call; | |
2169 | int ret; | |
2170 | ||
2171 | list_for_each_entry(call, &ftrace_events, list) { | |
2172 | /* Early boot up should not have any modules loaded */ | |
2173 | if (WARN_ON_ONCE(call->mod)) | |
2174 | continue; | |
2175 | ||
2176 | ret = __trace_early_add_new_event(call, tr); | |
2177 | if (ret < 0) | |
2178 | pr_warning("Could not create early event %s\n", | |
2179 | call->name); | |
2180 | } | |
2181 | } | |
2182 | ||
0c8916c3 SR |
2183 | /* Remove the event directory structure for a trace directory. */ |
2184 | static void | |
2185 | __trace_remove_event_dirs(struct trace_array *tr) | |
2186 | { | |
2187 | struct ftrace_event_file *file, *next; | |
2188 | ||
2189 | list_for_each_entry_safe(file, next, &tr->events, list) { | |
2190 | list_del(&file->list); | |
2191 | debugfs_remove_recursive(file->dir); | |
2192 | remove_subsystem(file->system); | |
d1a29143 | 2193 | kmem_cache_free(file_cachep, file); |
0c8916c3 SR |
2194 | } |
2195 | } | |
2196 | ||
ae63b31e SR |
2197 | static void |
2198 | __add_event_to_tracers(struct ftrace_event_call *call, | |
2199 | struct ftrace_module_file_ops *file_ops) | |
2200 | { | |
2201 | struct trace_array *tr; | |
2202 | ||
2203 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
2204 | if (file_ops) | |
315326c1 | 2205 | __trace_add_new_mod_event(call, tr, file_ops); |
ae63b31e SR |
2206 | else |
2207 | __trace_add_new_event(call, tr, | |
2208 | &ftrace_event_id_fops, | |
2209 | &ftrace_enable_fops, | |
2210 | &ftrace_event_filter_fops, | |
2211 | &ftrace_event_format_fops); | |
2212 | } | |
2213 | } | |
2214 | ||
ec827c7e | 2215 | static struct notifier_block trace_module_nb = { |
6d723736 SR |
2216 | .notifier_call = trace_module_notify, |
2217 | .priority = 0, | |
2218 | }; | |
2219 | ||
e4a9ea5e SR |
2220 | extern struct ftrace_event_call *__start_ftrace_events[]; |
2221 | extern struct ftrace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 2222 | |
020e5f85 LZ |
2223 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
2224 | ||
2225 | static __init int setup_trace_event(char *str) | |
2226 | { | |
2227 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
55034cd6 SRRH |
2228 | ring_buffer_expanded = true; |
2229 | tracing_selftest_disabled = true; | |
020e5f85 LZ |
2230 | |
2231 | return 1; | |
2232 | } | |
2233 | __setup("trace_event=", setup_trace_event); | |
2234 | ||
77248221 SR |
2235 | /* Expects to have event_mutex held when called */ |
2236 | static int | |
2237 | create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) | |
ae63b31e SR |
2238 | { |
2239 | struct dentry *d_events; | |
2240 | struct dentry *entry; | |
2241 | ||
2242 | entry = debugfs_create_file("set_event", 0644, parent, | |
2243 | tr, &ftrace_set_event_fops); | |
2244 | if (!entry) { | |
2245 | pr_warning("Could not create debugfs 'set_event' entry\n"); | |
2246 | return -ENOMEM; | |
2247 | } | |
2248 | ||
2249 | d_events = debugfs_create_dir("events", parent); | |
277ba044 | 2250 | if (!d_events) { |
ae63b31e | 2251 | pr_warning("Could not create debugfs 'events' directory\n"); |
277ba044 SR |
2252 | return -ENOMEM; |
2253 | } | |
ae63b31e SR |
2254 | |
2255 | /* ring buffer internal formats */ | |
2256 | trace_create_file("header_page", 0444, d_events, | |
2257 | ring_buffer_print_page_header, | |
2258 | &ftrace_show_header_fops); | |
2259 | ||
2260 | trace_create_file("header_event", 0444, d_events, | |
2261 | ring_buffer_print_entry_header, | |
2262 | &ftrace_show_header_fops); | |
2263 | ||
2264 | trace_create_file("enable", 0644, d_events, | |
2265 | tr, &ftrace_tr_enable_fops); | |
2266 | ||
2267 | tr->event_dir = d_events; | |
77248221 SR |
2268 | |
2269 | return 0; | |
2270 | } | |
2271 | ||
2272 | /** | |
2273 | * event_trace_add_tracer - add a instance of a trace_array to events | |
2274 | * @parent: The parent dentry to place the files/directories for events in | |
2275 | * @tr: The trace array associated with these events | |
2276 | * | |
2277 | * When a new instance is created, it needs to set up its events | |
2278 | * directory, as well as other files associated with events. It also | |
2279 | * creates the event hierachry in the @parent/events directory. | |
2280 | * | |
2281 | * Returns 0 on success. | |
2282 | */ | |
2283 | int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2284 | { | |
2285 | int ret; | |
2286 | ||
2287 | mutex_lock(&event_mutex); | |
2288 | ||
2289 | ret = create_event_toplevel_files(parent, tr); | |
2290 | if (ret) | |
2291 | goto out_unlock; | |
2292 | ||
52f6ad6d | 2293 | down_write(&trace_event_sem); |
ae63b31e | 2294 | __trace_add_event_dirs(tr); |
52f6ad6d | 2295 | up_write(&trace_event_sem); |
277ba044 | 2296 | |
77248221 | 2297 | out_unlock: |
277ba044 | 2298 | mutex_unlock(&event_mutex); |
ae63b31e | 2299 | |
77248221 SR |
2300 | return ret; |
2301 | } | |
2302 | ||
2303 | /* | |
2304 | * The top trace array already had its file descriptors created. | |
2305 | * Now the files themselves need to be created. | |
2306 | */ | |
2307 | static __init int | |
2308 | early_event_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2309 | { | |
2310 | int ret; | |
2311 | ||
2312 | mutex_lock(&event_mutex); | |
2313 | ||
2314 | ret = create_event_toplevel_files(parent, tr); | |
2315 | if (ret) | |
2316 | goto out_unlock; | |
2317 | ||
52f6ad6d | 2318 | down_write(&trace_event_sem); |
77248221 | 2319 | __trace_early_add_event_dirs(tr); |
52f6ad6d | 2320 | up_write(&trace_event_sem); |
77248221 SR |
2321 | |
2322 | out_unlock: | |
2323 | mutex_unlock(&event_mutex); | |
2324 | ||
2325 | return ret; | |
ae63b31e SR |
2326 | } |
2327 | ||
0c8916c3 SR |
2328 | int event_trace_del_tracer(struct trace_array *tr) |
2329 | { | |
2330 | /* Disable any running events */ | |
2331 | __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); | |
2332 | ||
2333 | mutex_lock(&event_mutex); | |
2334 | ||
52f6ad6d | 2335 | down_write(&trace_event_sem); |
0c8916c3 SR |
2336 | __trace_remove_event_dirs(tr); |
2337 | debugfs_remove_recursive(tr->event_dir); | |
52f6ad6d | 2338 | up_write(&trace_event_sem); |
0c8916c3 SR |
2339 | |
2340 | tr->event_dir = NULL; | |
2341 | ||
2342 | mutex_unlock(&event_mutex); | |
2343 | ||
2344 | return 0; | |
2345 | } | |
2346 | ||
d1a29143 SR |
2347 | static __init int event_trace_memsetup(void) |
2348 | { | |
2349 | field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); | |
2350 | file_cachep = KMEM_CACHE(ftrace_event_file, SLAB_PANIC); | |
2351 | return 0; | |
2352 | } | |
2353 | ||
8781915a EG |
2354 | static __init int event_trace_enable(void) |
2355 | { | |
ae63b31e | 2356 | struct trace_array *tr = top_trace_array(); |
8781915a EG |
2357 | struct ftrace_event_call **iter, *call; |
2358 | char *buf = bootup_event_buf; | |
2359 | char *token; | |
2360 | int ret; | |
2361 | ||
2362 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { | |
2363 | ||
2364 | call = *iter; | |
2365 | ret = event_init(call); | |
2366 | if (!ret) | |
2367 | list_add(&call->list, &ftrace_events); | |
2368 | } | |
2369 | ||
77248221 SR |
2370 | /* |
2371 | * We need the top trace array to have a working set of trace | |
2372 | * points at early init, before the debug files and directories | |
2373 | * are created. Create the file entries now, and attach them | |
2374 | * to the actual file dentries later. | |
2375 | */ | |
2376 | __trace_early_add_events(tr); | |
2377 | ||
8781915a EG |
2378 | while (true) { |
2379 | token = strsep(&buf, ","); | |
2380 | ||
2381 | if (!token) | |
2382 | break; | |
2383 | if (!*token) | |
2384 | continue; | |
2385 | ||
ae63b31e | 2386 | ret = ftrace_set_clr_event(tr, token, 1); |
8781915a EG |
2387 | if (ret) |
2388 | pr_warn("Failed to enable trace event: %s\n", token); | |
2389 | } | |
81698831 SR |
2390 | |
2391 | trace_printk_start_comm(); | |
2392 | ||
3cd715de SRRH |
2393 | register_event_cmds(); |
2394 | ||
8781915a EG |
2395 | return 0; |
2396 | } | |
2397 | ||
b77e38aa SR |
2398 | static __init int event_trace_init(void) |
2399 | { | |
ae63b31e | 2400 | struct trace_array *tr; |
b77e38aa SR |
2401 | struct dentry *d_tracer; |
2402 | struct dentry *entry; | |
6d723736 | 2403 | int ret; |
b77e38aa | 2404 | |
ae63b31e SR |
2405 | tr = top_trace_array(); |
2406 | ||
b77e38aa SR |
2407 | d_tracer = tracing_init_dentry(); |
2408 | if (!d_tracer) | |
2409 | return 0; | |
2410 | ||
2314c4ae | 2411 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
ae63b31e | 2412 | tr, &ftrace_avail_fops); |
2314c4ae SR |
2413 | if (!entry) |
2414 | pr_warning("Could not create debugfs " | |
2415 | "'available_events' entry\n"); | |
2416 | ||
8728fe50 LZ |
2417 | if (trace_define_common_fields()) |
2418 | pr_warning("tracing: Failed to allocate common fields"); | |
2419 | ||
77248221 | 2420 | ret = early_event_add_tracer(d_tracer, tr); |
ae63b31e SR |
2421 | if (ret) |
2422 | return ret; | |
020e5f85 | 2423 | |
6d723736 | 2424 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 2425 | if (ret) |
6d723736 SR |
2426 | pr_warning("Failed to register trace events module notifier\n"); |
2427 | ||
b77e38aa SR |
2428 | return 0; |
2429 | } | |
d1a29143 | 2430 | early_initcall(event_trace_memsetup); |
8781915a | 2431 | core_initcall(event_trace_enable); |
b77e38aa | 2432 | fs_initcall(event_trace_init); |
e6187007 SR |
2433 | |
2434 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
2435 | ||
2436 | static DEFINE_SPINLOCK(test_spinlock); | |
2437 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
2438 | static DEFINE_MUTEX(test_mutex); | |
2439 | ||
2440 | static __init void test_work(struct work_struct *dummy) | |
2441 | { | |
2442 | spin_lock(&test_spinlock); | |
2443 | spin_lock_irq(&test_spinlock_irq); | |
2444 | udelay(1); | |
2445 | spin_unlock_irq(&test_spinlock_irq); | |
2446 | spin_unlock(&test_spinlock); | |
2447 | ||
2448 | mutex_lock(&test_mutex); | |
2449 | msleep(1); | |
2450 | mutex_unlock(&test_mutex); | |
2451 | } | |
2452 | ||
2453 | static __init int event_test_thread(void *unused) | |
2454 | { | |
2455 | void *test_malloc; | |
2456 | ||
2457 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
2458 | if (!test_malloc) | |
2459 | pr_info("failed to kmalloc\n"); | |
2460 | ||
2461 | schedule_on_each_cpu(test_work); | |
2462 | ||
2463 | kfree(test_malloc); | |
2464 | ||
2465 | set_current_state(TASK_INTERRUPTIBLE); | |
2466 | while (!kthread_should_stop()) | |
2467 | schedule(); | |
2468 | ||
2469 | return 0; | |
2470 | } | |
2471 | ||
2472 | /* | |
2473 | * Do various things that may trigger events. | |
2474 | */ | |
2475 | static __init void event_test_stuff(void) | |
2476 | { | |
2477 | struct task_struct *test_thread; | |
2478 | ||
2479 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
2480 | msleep(1); | |
2481 | kthread_stop(test_thread); | |
2482 | } | |
2483 | ||
2484 | /* | |
2485 | * For every trace event defined, we will test each trace point separately, | |
2486 | * and then by groups, and finally all trace points. | |
2487 | */ | |
9ea21c1e | 2488 | static __init void event_trace_self_tests(void) |
e6187007 | 2489 | { |
ae63b31e SR |
2490 | struct ftrace_subsystem_dir *dir; |
2491 | struct ftrace_event_file *file; | |
e6187007 SR |
2492 | struct ftrace_event_call *call; |
2493 | struct event_subsystem *system; | |
ae63b31e | 2494 | struct trace_array *tr; |
e6187007 SR |
2495 | int ret; |
2496 | ||
ae63b31e SR |
2497 | tr = top_trace_array(); |
2498 | ||
e6187007 SR |
2499 | pr_info("Running tests on trace events:\n"); |
2500 | ||
ae63b31e SR |
2501 | list_for_each_entry(file, &tr->events, list) { |
2502 | ||
2503 | call = file->event_call; | |
e6187007 | 2504 | |
2239291a SR |
2505 | /* Only test those that have a probe */ |
2506 | if (!call->class || !call->class->probe) | |
e6187007 SR |
2507 | continue; |
2508 | ||
1f5a6b45 SR |
2509 | /* |
2510 | * Testing syscall events here is pretty useless, but | |
2511 | * we still do it if configured. But this is time consuming. | |
2512 | * What we really need is a user thread to perform the | |
2513 | * syscalls as we test. | |
2514 | */ | |
2515 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
2516 | if (call->class->system && |
2517 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
2518 | continue; |
2519 | #endif | |
2520 | ||
e6187007 SR |
2521 | pr_info("Testing event %s: ", call->name); |
2522 | ||
2523 | /* | |
2524 | * If an event is already enabled, someone is using | |
2525 | * it and the self test should not be on. | |
2526 | */ | |
ae63b31e | 2527 | if (file->flags & FTRACE_EVENT_FL_ENABLED) { |
e6187007 SR |
2528 | pr_warning("Enabled event during self test!\n"); |
2529 | WARN_ON_ONCE(1); | |
2530 | continue; | |
2531 | } | |
2532 | ||
ae63b31e | 2533 | ftrace_event_enable_disable(file, 1); |
e6187007 | 2534 | event_test_stuff(); |
ae63b31e | 2535 | ftrace_event_enable_disable(file, 0); |
e6187007 SR |
2536 | |
2537 | pr_cont("OK\n"); | |
2538 | } | |
2539 | ||
2540 | /* Now test at the sub system level */ | |
2541 | ||
2542 | pr_info("Running tests on trace event systems:\n"); | |
2543 | ||
ae63b31e SR |
2544 | list_for_each_entry(dir, &tr->systems, list) { |
2545 | ||
2546 | system = dir->subsystem; | |
e6187007 SR |
2547 | |
2548 | /* the ftrace system is special, skip it */ | |
2549 | if (strcmp(system->name, "ftrace") == 0) | |
2550 | continue; | |
2551 | ||
2552 | pr_info("Testing event system %s: ", system->name); | |
2553 | ||
ae63b31e | 2554 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
e6187007 SR |
2555 | if (WARN_ON_ONCE(ret)) { |
2556 | pr_warning("error enabling system %s\n", | |
2557 | system->name); | |
2558 | continue; | |
2559 | } | |
2560 | ||
2561 | event_test_stuff(); | |
2562 | ||
ae63b31e | 2563 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
76bab1b7 | 2564 | if (WARN_ON_ONCE(ret)) { |
e6187007 SR |
2565 | pr_warning("error disabling system %s\n", |
2566 | system->name); | |
76bab1b7 YL |
2567 | continue; |
2568 | } | |
e6187007 SR |
2569 | |
2570 | pr_cont("OK\n"); | |
2571 | } | |
2572 | ||
2573 | /* Test with all events enabled */ | |
2574 | ||
2575 | pr_info("Running tests on all trace events:\n"); | |
2576 | pr_info("Testing all events: "); | |
2577 | ||
ae63b31e | 2578 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
e6187007 | 2579 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 2580 | pr_warning("error enabling all events\n"); |
9ea21c1e | 2581 | return; |
e6187007 SR |
2582 | } |
2583 | ||
2584 | event_test_stuff(); | |
2585 | ||
2586 | /* reset sysname */ | |
ae63b31e | 2587 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
e6187007 SR |
2588 | if (WARN_ON_ONCE(ret)) { |
2589 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 2590 | return; |
e6187007 SR |
2591 | } |
2592 | ||
2593 | pr_cont("OK\n"); | |
9ea21c1e SR |
2594 | } |
2595 | ||
2596 | #ifdef CONFIG_FUNCTION_TRACER | |
2597 | ||
245b2e70 | 2598 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e SR |
2599 | |
2600 | static void | |
2f5f6ad9 | 2601 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 2602 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
9ea21c1e SR |
2603 | { |
2604 | struct ring_buffer_event *event; | |
e77405ad | 2605 | struct ring_buffer *buffer; |
9ea21c1e SR |
2606 | struct ftrace_entry *entry; |
2607 | unsigned long flags; | |
2608 | long disabled; | |
9ea21c1e SR |
2609 | int cpu; |
2610 | int pc; | |
2611 | ||
2612 | pc = preempt_count(); | |
5168ae50 | 2613 | preempt_disable_notrace(); |
9ea21c1e | 2614 | cpu = raw_smp_processor_id(); |
245b2e70 | 2615 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
2616 | |
2617 | if (disabled != 1) | |
2618 | goto out; | |
2619 | ||
2620 | local_save_flags(flags); | |
2621 | ||
e77405ad SR |
2622 | event = trace_current_buffer_lock_reserve(&buffer, |
2623 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
2624 | flags, pc); |
2625 | if (!event) | |
2626 | goto out; | |
2627 | entry = ring_buffer_event_data(event); | |
2628 | entry->ip = ip; | |
2629 | entry->parent_ip = parent_ip; | |
2630 | ||
0d5c6e1c | 2631 | trace_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
2632 | |
2633 | out: | |
245b2e70 | 2634 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 2635 | preempt_enable_notrace(); |
9ea21c1e SR |
2636 | } |
2637 | ||
2638 | static struct ftrace_ops trace_ops __initdata = | |
2639 | { | |
2640 | .func = function_test_events_call, | |
4740974a | 2641 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
9ea21c1e SR |
2642 | }; |
2643 | ||
2644 | static __init void event_trace_self_test_with_function(void) | |
2645 | { | |
17bb615a SR |
2646 | int ret; |
2647 | ret = register_ftrace_function(&trace_ops); | |
2648 | if (WARN_ON(ret < 0)) { | |
2649 | pr_info("Failed to enable function tracer for event tests\n"); | |
2650 | return; | |
2651 | } | |
9ea21c1e SR |
2652 | pr_info("Running tests again, along with the function tracer\n"); |
2653 | event_trace_self_tests(); | |
2654 | unregister_ftrace_function(&trace_ops); | |
2655 | } | |
2656 | #else | |
2657 | static __init void event_trace_self_test_with_function(void) | |
2658 | { | |
2659 | } | |
2660 | #endif | |
2661 | ||
2662 | static __init int event_trace_self_tests_init(void) | |
2663 | { | |
020e5f85 LZ |
2664 | if (!tracing_selftest_disabled) { |
2665 | event_trace_self_tests(); | |
2666 | event_trace_self_test_with_function(); | |
2667 | } | |
e6187007 SR |
2668 | |
2669 | return 0; | |
2670 | } | |
2671 | ||
28d20e2d | 2672 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
2673 | |
2674 | #endif |