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); |
8728fe50 | 37 | 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 | ||
2e33af02 SR |
57 | struct list_head * |
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 | ||
8728fe50 LZ |
65 | static int __trace_define_field(struct list_head *head, const char *type, |
66 | const char *name, int offset, int size, | |
67 | int is_signed, int filter_type) | |
cf027f64 TZ |
68 | { |
69 | struct ftrace_event_field *field; | |
70 | ||
d1a29143 | 71 | field = kmem_cache_alloc(field_cachep, GFP_TRACE); |
cf027f64 TZ |
72 | if (!field) |
73 | goto err; | |
fe9f57f2 | 74 | |
92edca07 SR |
75 | field->name = name; |
76 | field->type = type; | |
fe9f57f2 | 77 | |
43b51ead LZ |
78 | if (filter_type == FILTER_OTHER) |
79 | field->filter_type = filter_assign_type(type); | |
80 | else | |
81 | field->filter_type = filter_type; | |
82 | ||
cf027f64 TZ |
83 | field->offset = offset; |
84 | field->size = size; | |
a118e4d1 | 85 | field->is_signed = is_signed; |
aa38e9fc | 86 | |
2e33af02 | 87 | list_add(&field->link, head); |
cf027f64 TZ |
88 | |
89 | return 0; | |
fe9f57f2 | 90 | |
cf027f64 | 91 | err: |
d1a29143 | 92 | kmem_cache_free(field_cachep, field); |
fe9f57f2 | 93 | |
cf027f64 TZ |
94 | return -ENOMEM; |
95 | } | |
8728fe50 LZ |
96 | |
97 | int trace_define_field(struct ftrace_event_call *call, const char *type, | |
98 | const char *name, int offset, int size, int is_signed, | |
99 | int filter_type) | |
100 | { | |
101 | struct list_head *head; | |
102 | ||
103 | if (WARN_ON(!call->class)) | |
104 | return 0; | |
105 | ||
106 | head = trace_get_fields(call); | |
107 | return __trace_define_field(head, type, name, offset, size, | |
108 | is_signed, filter_type); | |
109 | } | |
17c873ec | 110 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 111 | |
e647d6b3 | 112 | #define __common_field(type, item) \ |
8728fe50 LZ |
113 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
114 | "common_" #item, \ | |
115 | offsetof(typeof(ent), item), \ | |
116 | sizeof(ent.item), \ | |
117 | is_signed_type(type), FILTER_OTHER); \ | |
e647d6b3 LZ |
118 | if (ret) \ |
119 | return ret; | |
120 | ||
8728fe50 | 121 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
122 | { |
123 | int ret; | |
124 | struct trace_entry ent; | |
125 | ||
126 | __common_field(unsigned short, type); | |
127 | __common_field(unsigned char, flags); | |
128 | __common_field(unsigned char, preempt_count); | |
129 | __common_field(int, pid); | |
e647d6b3 LZ |
130 | |
131 | return ret; | |
132 | } | |
133 | ||
bd1a5c84 | 134 | void trace_destroy_fields(struct ftrace_event_call *call) |
2df75e41 LZ |
135 | { |
136 | struct ftrace_event_field *field, *next; | |
2e33af02 | 137 | struct list_head *head; |
2df75e41 | 138 | |
2e33af02 SR |
139 | head = trace_get_fields(call); |
140 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 | 141 | list_del(&field->link); |
d1a29143 | 142 | kmem_cache_free(field_cachep, field); |
2df75e41 LZ |
143 | } |
144 | } | |
145 | ||
87d9b4e1 LZ |
146 | int trace_event_raw_init(struct ftrace_event_call *call) |
147 | { | |
148 | int id; | |
149 | ||
80decc70 | 150 | id = register_ftrace_event(&call->event); |
87d9b4e1 LZ |
151 | if (!id) |
152 | return -ENODEV; | |
87d9b4e1 LZ |
153 | |
154 | return 0; | |
155 | } | |
156 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
157 | ||
ceec0b6f JO |
158 | int ftrace_event_reg(struct ftrace_event_call *call, |
159 | enum trace_reg type, void *data) | |
a1d0ce82 | 160 | { |
ae63b31e SR |
161 | struct ftrace_event_file *file = data; |
162 | ||
a1d0ce82 SR |
163 | switch (type) { |
164 | case TRACE_REG_REGISTER: | |
165 | return tracepoint_probe_register(call->name, | |
166 | call->class->probe, | |
ae63b31e | 167 | file); |
a1d0ce82 SR |
168 | case TRACE_REG_UNREGISTER: |
169 | tracepoint_probe_unregister(call->name, | |
170 | call->class->probe, | |
ae63b31e | 171 | file); |
a1d0ce82 SR |
172 | return 0; |
173 | ||
174 | #ifdef CONFIG_PERF_EVENTS | |
175 | case TRACE_REG_PERF_REGISTER: | |
176 | return tracepoint_probe_register(call->name, | |
177 | call->class->perf_probe, | |
178 | call); | |
179 | case TRACE_REG_PERF_UNREGISTER: | |
180 | tracepoint_probe_unregister(call->name, | |
181 | call->class->perf_probe, | |
182 | call); | |
183 | return 0; | |
ceec0b6f JO |
184 | case TRACE_REG_PERF_OPEN: |
185 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
186 | case TRACE_REG_PERF_ADD: |
187 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 188 | return 0; |
a1d0ce82 SR |
189 | #endif |
190 | } | |
191 | return 0; | |
192 | } | |
193 | EXPORT_SYMBOL_GPL(ftrace_event_reg); | |
194 | ||
e870e9a1 LZ |
195 | void trace_event_enable_cmd_record(bool enable) |
196 | { | |
ae63b31e SR |
197 | struct ftrace_event_file *file; |
198 | struct trace_array *tr; | |
e870e9a1 LZ |
199 | |
200 | mutex_lock(&event_mutex); | |
ae63b31e SR |
201 | do_for_each_event_file(tr, file) { |
202 | ||
203 | if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) | |
e870e9a1 LZ |
204 | continue; |
205 | ||
206 | if (enable) { | |
207 | tracing_start_cmdline_record(); | |
417944c4 | 208 | set_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 LZ |
209 | } else { |
210 | tracing_stop_cmdline_record(); | |
417944c4 | 211 | clear_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 212 | } |
ae63b31e | 213 | } while_for_each_event_file(); |
e870e9a1 LZ |
214 | mutex_unlock(&event_mutex); |
215 | } | |
216 | ||
417944c4 SRRH |
217 | static int __ftrace_event_enable_disable(struct ftrace_event_file *file, |
218 | int enable, int soft_disable) | |
fd994989 | 219 | { |
ae63b31e | 220 | struct ftrace_event_call *call = file->event_call; |
3b8e4273 | 221 | int ret = 0; |
417944c4 | 222 | int disable; |
3b8e4273 | 223 | |
fd994989 SR |
224 | switch (enable) { |
225 | case 0: | |
417944c4 SRRH |
226 | /* |
227 | * When soft_disable is set and enable is cleared, we want | |
228 | * to clear the SOFT_DISABLED flag but leave the event in the | |
229 | * state that it was. That is, if the event was enabled and | |
230 | * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED | |
231 | * is set we do not want the event to be enabled before we | |
232 | * clear the bit. | |
233 | * | |
234 | * When soft_disable is not set but the SOFT_MODE flag is, | |
235 | * we do nothing. Do not disable the tracepoint, otherwise | |
236 | * "soft enable"s (clearing the SOFT_DISABLED bit) wont work. | |
237 | */ | |
238 | if (soft_disable) { | |
239 | disable = file->flags & FTRACE_EVENT_FL_SOFT_DISABLED; | |
240 | clear_bit(FTRACE_EVENT_FL_SOFT_MODE_BIT, &file->flags); | |
241 | } else | |
242 | disable = !(file->flags & FTRACE_EVENT_FL_SOFT_MODE); | |
243 | ||
244 | if (disable && (file->flags & FTRACE_EVENT_FL_ENABLED)) { | |
245 | clear_bit(FTRACE_EVENT_FL_ENABLED_BIT, &file->flags); | |
ae63b31e | 246 | if (file->flags & FTRACE_EVENT_FL_RECORDED_CMD) { |
e870e9a1 | 247 | tracing_stop_cmdline_record(); |
417944c4 | 248 | clear_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 249 | } |
ae63b31e | 250 | call->class->reg(call, TRACE_REG_UNREGISTER, file); |
fd994989 | 251 | } |
417944c4 SRRH |
252 | /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT */ |
253 | if (file->flags & FTRACE_EVENT_FL_SOFT_MODE) | |
254 | set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); | |
fd994989 SR |
255 | break; |
256 | case 1: | |
417944c4 SRRH |
257 | /* |
258 | * When soft_disable is set and enable is set, we want to | |
259 | * register the tracepoint for the event, but leave the event | |
260 | * as is. That means, if the event was already enabled, we do | |
261 | * nothing (but set SOFT_MODE). If the event is disabled, we | |
262 | * set SOFT_DISABLED before enabling the event tracepoint, so | |
263 | * it still seems to be disabled. | |
264 | */ | |
265 | if (!soft_disable) | |
266 | clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); | |
267 | else | |
268 | set_bit(FTRACE_EVENT_FL_SOFT_MODE_BIT, &file->flags); | |
269 | ||
ae63b31e | 270 | if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) { |
417944c4 SRRH |
271 | |
272 | /* Keep the event disabled, when going to SOFT_MODE. */ | |
273 | if (soft_disable) | |
274 | set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); | |
275 | ||
e870e9a1 LZ |
276 | if (trace_flags & TRACE_ITER_RECORD_CMD) { |
277 | tracing_start_cmdline_record(); | |
417944c4 | 278 | set_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 279 | } |
ae63b31e | 280 | ret = call->class->reg(call, TRACE_REG_REGISTER, file); |
3b8e4273 LZ |
281 | if (ret) { |
282 | tracing_stop_cmdline_record(); | |
283 | pr_info("event trace: Could not enable event " | |
284 | "%s\n", call->name); | |
285 | break; | |
286 | } | |
417944c4 | 287 | set_bit(FTRACE_EVENT_FL_ENABLED_BIT, &file->flags); |
575380da SRRH |
288 | |
289 | /* WAS_ENABLED gets set but never cleared. */ | |
290 | call->flags |= TRACE_EVENT_FL_WAS_ENABLED; | |
fd994989 | 291 | } |
fd994989 SR |
292 | break; |
293 | } | |
3b8e4273 LZ |
294 | |
295 | return ret; | |
fd994989 SR |
296 | } |
297 | ||
417944c4 SRRH |
298 | static int ftrace_event_enable_disable(struct ftrace_event_file *file, |
299 | int enable) | |
300 | { | |
301 | return __ftrace_event_enable_disable(file, enable, 0); | |
302 | } | |
303 | ||
ae63b31e | 304 | static void ftrace_clear_events(struct trace_array *tr) |
0e907c99 | 305 | { |
ae63b31e | 306 | struct ftrace_event_file *file; |
0e907c99 Z |
307 | |
308 | mutex_lock(&event_mutex); | |
ae63b31e SR |
309 | list_for_each_entry(file, &tr->events, list) { |
310 | ftrace_event_enable_disable(file, 0); | |
0e907c99 Z |
311 | } |
312 | mutex_unlock(&event_mutex); | |
313 | } | |
314 | ||
e9dbfae5 SR |
315 | static void __put_system(struct event_subsystem *system) |
316 | { | |
317 | struct event_filter *filter = system->filter; | |
318 | ||
319 | WARN_ON_ONCE(system->ref_count == 0); | |
320 | if (--system->ref_count) | |
321 | return; | |
322 | ||
ae63b31e SR |
323 | list_del(&system->list); |
324 | ||
e9dbfae5 SR |
325 | if (filter) { |
326 | kfree(filter->filter_string); | |
327 | kfree(filter); | |
328 | } | |
e9dbfae5 SR |
329 | kfree(system); |
330 | } | |
331 | ||
332 | static void __get_system(struct event_subsystem *system) | |
333 | { | |
334 | WARN_ON_ONCE(system->ref_count == 0); | |
335 | system->ref_count++; | |
336 | } | |
337 | ||
ae63b31e SR |
338 | static void __get_system_dir(struct ftrace_subsystem_dir *dir) |
339 | { | |
340 | WARN_ON_ONCE(dir->ref_count == 0); | |
341 | dir->ref_count++; | |
342 | __get_system(dir->subsystem); | |
343 | } | |
344 | ||
345 | static void __put_system_dir(struct ftrace_subsystem_dir *dir) | |
346 | { | |
347 | WARN_ON_ONCE(dir->ref_count == 0); | |
348 | /* If the subsystem is about to be freed, the dir must be too */ | |
349 | WARN_ON_ONCE(dir->subsystem->ref_count == 1 && dir->ref_count != 1); | |
350 | ||
351 | __put_system(dir->subsystem); | |
352 | if (!--dir->ref_count) | |
353 | kfree(dir); | |
354 | } | |
355 | ||
356 | static void put_system(struct ftrace_subsystem_dir *dir) | |
e9dbfae5 SR |
357 | { |
358 | mutex_lock(&event_mutex); | |
ae63b31e | 359 | __put_system_dir(dir); |
e9dbfae5 SR |
360 | mutex_unlock(&event_mutex); |
361 | } | |
362 | ||
8f31bfe5 LZ |
363 | /* |
364 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
365 | */ | |
ae63b31e SR |
366 | static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, |
367 | const char *sub, const char *event, int set) | |
b77e38aa | 368 | { |
ae63b31e | 369 | struct ftrace_event_file *file; |
a59fd602 | 370 | struct ftrace_event_call *call; |
29f93943 | 371 | int ret = -EINVAL; |
8f31bfe5 LZ |
372 | |
373 | mutex_lock(&event_mutex); | |
ae63b31e SR |
374 | list_for_each_entry(file, &tr->events, list) { |
375 | ||
376 | call = file->event_call; | |
8f31bfe5 | 377 | |
a1d0ce82 | 378 | if (!call->name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
379 | continue; |
380 | ||
9b63776f SR |
381 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
382 | continue; | |
383 | ||
8f31bfe5 LZ |
384 | if (match && |
385 | strcmp(match, call->name) != 0 && | |
8f082018 | 386 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
387 | continue; |
388 | ||
8f082018 | 389 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
390 | continue; |
391 | ||
392 | if (event && strcmp(event, call->name) != 0) | |
393 | continue; | |
394 | ||
ae63b31e | 395 | ftrace_event_enable_disable(file, set); |
8f31bfe5 LZ |
396 | |
397 | ret = 0; | |
398 | } | |
399 | mutex_unlock(&event_mutex); | |
400 | ||
401 | return ret; | |
402 | } | |
403 | ||
ae63b31e | 404 | static int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set) |
8f31bfe5 | 405 | { |
b628b3e6 | 406 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
407 | |
408 | /* | |
409 | * The buf format can be <subsystem>:<event-name> | |
410 | * *:<event-name> means any event by that name. | |
411 | * :<event-name> is the same. | |
412 | * | |
413 | * <subsystem>:* means all events in that subsystem | |
414 | * <subsystem>: means the same. | |
415 | * | |
416 | * <name> (no ':') means all events in a subsystem with | |
417 | * the name <name> or any event that matches <name> | |
418 | */ | |
419 | ||
420 | match = strsep(&buf, ":"); | |
421 | if (buf) { | |
422 | sub = match; | |
423 | event = buf; | |
424 | match = NULL; | |
425 | ||
426 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
427 | sub = NULL; | |
428 | if (!strlen(event) || strcmp(event, "*") == 0) | |
429 | event = NULL; | |
430 | } | |
b77e38aa | 431 | |
ae63b31e | 432 | return __ftrace_set_clr_event(tr, match, sub, event, set); |
b77e38aa SR |
433 | } |
434 | ||
4671c794 SR |
435 | /** |
436 | * trace_set_clr_event - enable or disable an event | |
437 | * @system: system name to match (NULL for any system) | |
438 | * @event: event name to match (NULL for all events, within system) | |
439 | * @set: 1 to enable, 0 to disable | |
440 | * | |
441 | * This is a way for other parts of the kernel to enable or disable | |
442 | * event recording. | |
443 | * | |
444 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
445 | * registered events. | |
446 | */ | |
447 | int trace_set_clr_event(const char *system, const char *event, int set) | |
448 | { | |
ae63b31e SR |
449 | struct trace_array *tr = top_trace_array(); |
450 | ||
451 | return __ftrace_set_clr_event(tr, NULL, system, event, set); | |
4671c794 | 452 | } |
56355b83 | 453 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 454 | |
b77e38aa SR |
455 | /* 128 should be much more than enough */ |
456 | #define EVENT_BUF_SIZE 127 | |
457 | ||
458 | static ssize_t | |
459 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
460 | size_t cnt, loff_t *ppos) | |
461 | { | |
48966364 | 462 | struct trace_parser parser; |
ae63b31e SR |
463 | struct seq_file *m = file->private_data; |
464 | struct trace_array *tr = m->private; | |
4ba7978e | 465 | ssize_t read, ret; |
b77e38aa | 466 | |
4ba7978e | 467 | if (!cnt) |
b77e38aa SR |
468 | return 0; |
469 | ||
1852fcce SR |
470 | ret = tracing_update_buffers(); |
471 | if (ret < 0) | |
472 | return ret; | |
473 | ||
48966364 | 474 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
475 | return -ENOMEM; |
476 | ||
48966364 | 477 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
478 | ||
4ba7978e | 479 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 480 | int set = 1; |
b77e38aa | 481 | |
48966364 | 482 | if (*parser.buffer == '!') |
b77e38aa | 483 | set = 0; |
b77e38aa | 484 | |
48966364 | 485 | parser.buffer[parser.idx] = 0; |
486 | ||
ae63b31e | 487 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
b77e38aa | 488 | if (ret) |
48966364 | 489 | goto out_put; |
b77e38aa | 490 | } |
b77e38aa SR |
491 | |
492 | ret = read; | |
493 | ||
48966364 | 494 | out_put: |
495 | trace_parser_put(&parser); | |
b77e38aa SR |
496 | |
497 | return ret; | |
498 | } | |
499 | ||
500 | static void * | |
501 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
502 | { | |
ae63b31e SR |
503 | struct ftrace_event_file *file = v; |
504 | struct ftrace_event_call *call; | |
505 | struct trace_array *tr = m->private; | |
b77e38aa SR |
506 | |
507 | (*pos)++; | |
508 | ||
ae63b31e SR |
509 | list_for_each_entry_continue(file, &tr->events, list) { |
510 | call = file->event_call; | |
40e26815 SR |
511 | /* |
512 | * The ftrace subsystem is for showing formats only. | |
513 | * They can not be enabled or disabled via the event files. | |
514 | */ | |
a1d0ce82 | 515 | if (call->class && call->class->reg) |
ae63b31e | 516 | return file; |
40e26815 | 517 | } |
b77e38aa | 518 | |
30bd39cd | 519 | return NULL; |
b77e38aa SR |
520 | } |
521 | ||
522 | static void *t_start(struct seq_file *m, loff_t *pos) | |
523 | { | |
ae63b31e SR |
524 | struct ftrace_event_file *file; |
525 | struct trace_array *tr = m->private; | |
e1c7e2a6 LZ |
526 | loff_t l; |
527 | ||
20c8928a | 528 | mutex_lock(&event_mutex); |
e1c7e2a6 | 529 | |
ae63b31e | 530 | file = list_entry(&tr->events, struct ftrace_event_file, list); |
e1c7e2a6 | 531 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
532 | file = t_next(m, file, &l); |
533 | if (!file) | |
e1c7e2a6 LZ |
534 | break; |
535 | } | |
ae63b31e | 536 | return file; |
b77e38aa SR |
537 | } |
538 | ||
539 | static void * | |
540 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
541 | { | |
ae63b31e SR |
542 | struct ftrace_event_file *file = v; |
543 | struct trace_array *tr = m->private; | |
b77e38aa SR |
544 | |
545 | (*pos)++; | |
546 | ||
ae63b31e SR |
547 | list_for_each_entry_continue(file, &tr->events, list) { |
548 | if (file->flags & FTRACE_EVENT_FL_ENABLED) | |
549 | return file; | |
b77e38aa SR |
550 | } |
551 | ||
30bd39cd | 552 | return NULL; |
b77e38aa SR |
553 | } |
554 | ||
555 | static void *s_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 = s_next(m, file, &l); |
566 | if (!file) | |
e1c7e2a6 LZ |
567 | break; |
568 | } | |
ae63b31e | 569 | return file; |
b77e38aa SR |
570 | } |
571 | ||
572 | static int t_show(struct seq_file *m, void *v) | |
573 | { | |
ae63b31e SR |
574 | struct ftrace_event_file *file = v; |
575 | struct ftrace_event_call *call = file->event_call; | |
b77e38aa | 576 | |
8f082018 SR |
577 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
578 | seq_printf(m, "%s:", call->class->system); | |
b77e38aa SR |
579 | seq_printf(m, "%s\n", call->name); |
580 | ||
581 | return 0; | |
582 | } | |
583 | ||
584 | static void t_stop(struct seq_file *m, void *p) | |
585 | { | |
20c8928a | 586 | mutex_unlock(&event_mutex); |
b77e38aa SR |
587 | } |
588 | ||
1473e441 SR |
589 | static ssize_t |
590 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
591 | loff_t *ppos) | |
592 | { | |
ae63b31e | 593 | struct ftrace_event_file *file = filp->private_data; |
1473e441 SR |
594 | char *buf; |
595 | ||
417944c4 SRRH |
596 | if (file->flags & FTRACE_EVENT_FL_ENABLED) { |
597 | if (file->flags & FTRACE_EVENT_FL_SOFT_DISABLED) | |
598 | buf = "0*\n"; | |
599 | else | |
600 | buf = "1\n"; | |
601 | } else | |
1473e441 SR |
602 | buf = "0\n"; |
603 | ||
417944c4 | 604 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf)); |
1473e441 SR |
605 | } |
606 | ||
607 | static ssize_t | |
608 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
609 | loff_t *ppos) | |
610 | { | |
ae63b31e | 611 | struct ftrace_event_file *file = filp->private_data; |
1473e441 SR |
612 | unsigned long val; |
613 | int ret; | |
614 | ||
ae63b31e SR |
615 | if (!file) |
616 | return -EINVAL; | |
617 | ||
22fe9b54 PH |
618 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
619 | if (ret) | |
1473e441 SR |
620 | return ret; |
621 | ||
1852fcce SR |
622 | ret = tracing_update_buffers(); |
623 | if (ret < 0) | |
624 | return ret; | |
625 | ||
1473e441 SR |
626 | switch (val) { |
627 | case 0: | |
1473e441 | 628 | case 1: |
11a241a3 | 629 | mutex_lock(&event_mutex); |
ae63b31e | 630 | ret = ftrace_event_enable_disable(file, val); |
11a241a3 | 631 | mutex_unlock(&event_mutex); |
1473e441 SR |
632 | break; |
633 | ||
634 | default: | |
635 | return -EINVAL; | |
636 | } | |
637 | ||
638 | *ppos += cnt; | |
639 | ||
3b8e4273 | 640 | return ret ? ret : cnt; |
1473e441 SR |
641 | } |
642 | ||
8ae79a13 SR |
643 | static ssize_t |
644 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
645 | loff_t *ppos) | |
646 | { | |
c142b15d | 647 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
ae63b31e SR |
648 | struct ftrace_subsystem_dir *dir = filp->private_data; |
649 | struct event_subsystem *system = dir->subsystem; | |
8ae79a13 | 650 | struct ftrace_event_call *call; |
ae63b31e SR |
651 | struct ftrace_event_file *file; |
652 | struct trace_array *tr = dir->tr; | |
8ae79a13 | 653 | char buf[2]; |
c142b15d | 654 | int set = 0; |
8ae79a13 SR |
655 | int ret; |
656 | ||
8ae79a13 | 657 | mutex_lock(&event_mutex); |
ae63b31e SR |
658 | list_for_each_entry(file, &tr->events, list) { |
659 | call = file->event_call; | |
a1d0ce82 | 660 | if (!call->name || !call->class || !call->class->reg) |
8ae79a13 SR |
661 | continue; |
662 | ||
40ee4dff | 663 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
664 | continue; |
665 | ||
666 | /* | |
667 | * We need to find out if all the events are set | |
668 | * or if all events or cleared, or if we have | |
669 | * a mixture. | |
670 | */ | |
ae63b31e | 671 | set |= (1 << !!(file->flags & FTRACE_EVENT_FL_ENABLED)); |
c142b15d | 672 | |
8ae79a13 SR |
673 | /* |
674 | * If we have a mixture, no need to look further. | |
675 | */ | |
c142b15d | 676 | if (set == 3) |
8ae79a13 SR |
677 | break; |
678 | } | |
679 | mutex_unlock(&event_mutex); | |
680 | ||
c142b15d | 681 | buf[0] = set_to_char[set]; |
8ae79a13 | 682 | buf[1] = '\n'; |
8ae79a13 SR |
683 | |
684 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
685 | ||
686 | return ret; | |
687 | } | |
688 | ||
689 | static ssize_t | |
690 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
691 | loff_t *ppos) | |
692 | { | |
ae63b31e SR |
693 | struct ftrace_subsystem_dir *dir = filp->private_data; |
694 | struct event_subsystem *system = dir->subsystem; | |
40ee4dff | 695 | const char *name = NULL; |
8ae79a13 | 696 | unsigned long val; |
8ae79a13 SR |
697 | ssize_t ret; |
698 | ||
22fe9b54 PH |
699 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
700 | if (ret) | |
8ae79a13 SR |
701 | return ret; |
702 | ||
703 | ret = tracing_update_buffers(); | |
704 | if (ret < 0) | |
705 | return ret; | |
706 | ||
8f31bfe5 | 707 | if (val != 0 && val != 1) |
8ae79a13 | 708 | return -EINVAL; |
8ae79a13 | 709 | |
40ee4dff SR |
710 | /* |
711 | * Opening of "enable" adds a ref count to system, | |
712 | * so the name is safe to use. | |
713 | */ | |
714 | if (system) | |
715 | name = system->name; | |
716 | ||
ae63b31e | 717 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
8ae79a13 | 718 | if (ret) |
8f31bfe5 | 719 | goto out; |
8ae79a13 SR |
720 | |
721 | ret = cnt; | |
722 | ||
8f31bfe5 | 723 | out: |
8ae79a13 SR |
724 | *ppos += cnt; |
725 | ||
726 | return ret; | |
727 | } | |
728 | ||
2a37a3df SR |
729 | enum { |
730 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
731 | FORMAT_FIELD_SEPERATOR = 2, |
732 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
733 | }; |
734 | ||
735 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 736 | { |
2a37a3df | 737 | struct ftrace_event_call *call = m->private; |
5a65e956 | 738 | struct ftrace_event_field *field; |
86397dc3 LZ |
739 | struct list_head *common_head = &ftrace_common_fields; |
740 | struct list_head *head = trace_get_fields(call); | |
981d081e | 741 | |
2a37a3df | 742 | (*pos)++; |
5a65e956 | 743 | |
2a37a3df SR |
744 | switch ((unsigned long)v) { |
745 | case FORMAT_HEADER: | |
86397dc3 LZ |
746 | if (unlikely(list_empty(common_head))) |
747 | return NULL; | |
748 | ||
749 | field = list_entry(common_head->prev, | |
750 | struct ftrace_event_field, link); | |
751 | return field; | |
5a65e956 | 752 | |
86397dc3 | 753 | case FORMAT_FIELD_SEPERATOR: |
2a37a3df SR |
754 | if (unlikely(list_empty(head))) |
755 | return NULL; | |
5a65e956 | 756 | |
2a37a3df SR |
757 | field = list_entry(head->prev, struct ftrace_event_field, link); |
758 | return field; | |
5a65e956 | 759 | |
2a37a3df SR |
760 | case FORMAT_PRINTFMT: |
761 | /* all done */ | |
762 | return NULL; | |
5a65e956 LJ |
763 | } |
764 | ||
2a37a3df | 765 | field = v; |
86397dc3 LZ |
766 | if (field->link.prev == common_head) |
767 | return (void *)FORMAT_FIELD_SEPERATOR; | |
768 | else if (field->link.prev == head) | |
2a37a3df SR |
769 | return (void *)FORMAT_PRINTFMT; |
770 | ||
771 | field = list_entry(field->link.prev, struct ftrace_event_field, link); | |
772 | ||
2a37a3df | 773 | return field; |
8728fe50 | 774 | } |
5a65e956 | 775 | |
2a37a3df | 776 | static void *f_start(struct seq_file *m, loff_t *pos) |
8728fe50 | 777 | { |
2a37a3df SR |
778 | loff_t l = 0; |
779 | void *p; | |
5a65e956 | 780 | |
2a37a3df SR |
781 | /* Start by showing the header */ |
782 | if (!*pos) | |
783 | return (void *)FORMAT_HEADER; | |
784 | ||
785 | p = (void *)FORMAT_HEADER; | |
786 | do { | |
787 | p = f_next(m, p, &l); | |
788 | } while (p && l < *pos); | |
789 | ||
790 | return p; | |
791 | } | |
792 | ||
793 | static int f_show(struct seq_file *m, void *v) | |
794 | { | |
795 | struct ftrace_event_call *call = m->private; | |
796 | struct ftrace_event_field *field; | |
797 | const char *array_descriptor; | |
798 | ||
799 | switch ((unsigned long)v) { | |
800 | case FORMAT_HEADER: | |
801 | seq_printf(m, "name: %s\n", call->name); | |
802 | seq_printf(m, "ID: %d\n", call->event.type); | |
803 | seq_printf(m, "format:\n"); | |
8728fe50 | 804 | return 0; |
5a65e956 | 805 | |
86397dc3 LZ |
806 | case FORMAT_FIELD_SEPERATOR: |
807 | seq_putc(m, '\n'); | |
808 | return 0; | |
809 | ||
2a37a3df SR |
810 | case FORMAT_PRINTFMT: |
811 | seq_printf(m, "\nprint fmt: %s\n", | |
812 | call->print_fmt); | |
813 | return 0; | |
981d081e | 814 | } |
8728fe50 | 815 | |
2a37a3df | 816 | field = v; |
8728fe50 | 817 | |
2a37a3df SR |
818 | /* |
819 | * Smartly shows the array type(except dynamic array). | |
820 | * Normal: | |
821 | * field:TYPE VAR | |
822 | * If TYPE := TYPE[LEN], it is shown: | |
823 | * field:TYPE VAR[LEN] | |
824 | */ | |
825 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 826 | |
2a37a3df SR |
827 | if (!strncmp(field->type, "__data_loc", 10)) |
828 | array_descriptor = NULL; | |
8728fe50 | 829 | |
2a37a3df SR |
830 | if (!array_descriptor) |
831 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
832 | field->type, field->name, field->offset, | |
833 | field->size, !!field->is_signed); | |
834 | else | |
835 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
836 | (int)(array_descriptor - field->type), | |
837 | field->type, field->name, | |
838 | array_descriptor, field->offset, | |
839 | field->size, !!field->is_signed); | |
8728fe50 | 840 | |
2a37a3df SR |
841 | return 0; |
842 | } | |
5a65e956 | 843 | |
2a37a3df SR |
844 | static void f_stop(struct seq_file *m, void *p) |
845 | { | |
846 | } | |
981d081e | 847 | |
2a37a3df SR |
848 | static const struct seq_operations trace_format_seq_ops = { |
849 | .start = f_start, | |
850 | .next = f_next, | |
851 | .stop = f_stop, | |
852 | .show = f_show, | |
853 | }; | |
854 | ||
855 | static int trace_format_open(struct inode *inode, struct file *file) | |
856 | { | |
857 | struct ftrace_event_call *call = inode->i_private; | |
858 | struct seq_file *m; | |
859 | int ret; | |
860 | ||
861 | ret = seq_open(file, &trace_format_seq_ops); | |
862 | if (ret < 0) | |
863 | return ret; | |
864 | ||
865 | m = file->private_data; | |
866 | m->private = call; | |
867 | ||
868 | return 0; | |
981d081e SR |
869 | } |
870 | ||
23725aee PZ |
871 | static ssize_t |
872 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
873 | { | |
874 | struct ftrace_event_call *call = filp->private_data; | |
875 | struct trace_seq *s; | |
876 | int r; | |
877 | ||
878 | if (*ppos) | |
879 | return 0; | |
880 | ||
881 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
882 | if (!s) | |
883 | return -ENOMEM; | |
884 | ||
885 | trace_seq_init(s); | |
32c0edae | 886 | trace_seq_printf(s, "%d\n", call->event.type); |
23725aee PZ |
887 | |
888 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
889 | s->buffer, s->len); | |
890 | kfree(s); | |
891 | return r; | |
892 | } | |
893 | ||
7ce7e424 TZ |
894 | static ssize_t |
895 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
896 | loff_t *ppos) | |
897 | { | |
898 | struct ftrace_event_call *call = filp->private_data; | |
899 | struct trace_seq *s; | |
900 | int r; | |
901 | ||
902 | if (*ppos) | |
903 | return 0; | |
904 | ||
905 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
906 | if (!s) | |
907 | return -ENOMEM; | |
908 | ||
909 | trace_seq_init(s); | |
910 | ||
8b372562 | 911 | print_event_filter(call, s); |
4bda2d51 | 912 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
913 | |
914 | kfree(s); | |
915 | ||
916 | return r; | |
917 | } | |
918 | ||
919 | static ssize_t | |
920 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
921 | loff_t *ppos) | |
922 | { | |
923 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 924 | char *buf; |
7ce7e424 TZ |
925 | int err; |
926 | ||
8b372562 | 927 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
928 | return -EINVAL; |
929 | ||
8b372562 TZ |
930 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
931 | if (!buf) | |
7ce7e424 TZ |
932 | return -ENOMEM; |
933 | ||
8b372562 TZ |
934 | if (copy_from_user(buf, ubuf, cnt)) { |
935 | free_page((unsigned long) buf); | |
936 | return -EFAULT; | |
7ce7e424 | 937 | } |
8b372562 | 938 | buf[cnt] = '\0'; |
7ce7e424 | 939 | |
8b372562 TZ |
940 | err = apply_event_filter(call, buf); |
941 | free_page((unsigned long) buf); | |
942 | if (err < 0) | |
44e9c8b7 | 943 | return err; |
0a19e53c | 944 | |
7ce7e424 TZ |
945 | *ppos += cnt; |
946 | ||
947 | return cnt; | |
948 | } | |
949 | ||
e9dbfae5 SR |
950 | static LIST_HEAD(event_subsystems); |
951 | ||
952 | static int subsystem_open(struct inode *inode, struct file *filp) | |
953 | { | |
954 | struct event_subsystem *system = NULL; | |
ae63b31e SR |
955 | struct ftrace_subsystem_dir *dir = NULL; /* Initialize for gcc */ |
956 | struct trace_array *tr; | |
e9dbfae5 SR |
957 | int ret; |
958 | ||
959 | /* Make sure the system still exists */ | |
960 | mutex_lock(&event_mutex); | |
ae63b31e SR |
961 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
962 | list_for_each_entry(dir, &tr->systems, list) { | |
963 | if (dir == inode->i_private) { | |
964 | /* Don't open systems with no events */ | |
965 | if (dir->nr_events) { | |
966 | __get_system_dir(dir); | |
967 | system = dir->subsystem; | |
968 | } | |
969 | goto exit_loop; | |
e9dbfae5 | 970 | } |
e9dbfae5 SR |
971 | } |
972 | } | |
ae63b31e | 973 | exit_loop: |
e9dbfae5 SR |
974 | mutex_unlock(&event_mutex); |
975 | ||
ae63b31e | 976 | if (!system) |
e9dbfae5 SR |
977 | return -ENODEV; |
978 | ||
ae63b31e SR |
979 | /* Some versions of gcc think dir can be uninitialized here */ |
980 | WARN_ON(!dir); | |
981 | ||
e9dbfae5 | 982 | ret = tracing_open_generic(inode, filp); |
ae63b31e SR |
983 | if (ret < 0) |
984 | put_system(dir); | |
985 | ||
986 | return ret; | |
987 | } | |
988 | ||
989 | static int system_tr_open(struct inode *inode, struct file *filp) | |
990 | { | |
991 | struct ftrace_subsystem_dir *dir; | |
992 | struct trace_array *tr = inode->i_private; | |
993 | int ret; | |
994 | ||
995 | /* Make a temporary dir that has no system but points to tr */ | |
996 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); | |
997 | if (!dir) | |
998 | return -ENOMEM; | |
999 | ||
1000 | dir->tr = tr; | |
1001 | ||
1002 | ret = tracing_open_generic(inode, filp); | |
1003 | if (ret < 0) | |
1004 | kfree(dir); | |
1005 | ||
1006 | filp->private_data = dir; | |
e9dbfae5 SR |
1007 | |
1008 | return ret; | |
1009 | } | |
1010 | ||
1011 | static int subsystem_release(struct inode *inode, struct file *file) | |
1012 | { | |
ae63b31e | 1013 | struct ftrace_subsystem_dir *dir = file->private_data; |
e9dbfae5 | 1014 | |
ae63b31e SR |
1015 | /* |
1016 | * If dir->subsystem is NULL, then this is a temporary | |
1017 | * descriptor that was made for a trace_array to enable | |
1018 | * all subsystems. | |
1019 | */ | |
1020 | if (dir->subsystem) | |
1021 | put_system(dir); | |
1022 | else | |
1023 | kfree(dir); | |
e9dbfae5 SR |
1024 | |
1025 | return 0; | |
1026 | } | |
1027 | ||
cfb180f3 TZ |
1028 | static ssize_t |
1029 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1030 | loff_t *ppos) | |
1031 | { | |
ae63b31e SR |
1032 | struct ftrace_subsystem_dir *dir = filp->private_data; |
1033 | struct event_subsystem *system = dir->subsystem; | |
cfb180f3 TZ |
1034 | struct trace_seq *s; |
1035 | int r; | |
1036 | ||
1037 | if (*ppos) | |
1038 | return 0; | |
1039 | ||
1040 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1041 | if (!s) | |
1042 | return -ENOMEM; | |
1043 | ||
1044 | trace_seq_init(s); | |
1045 | ||
8b372562 | 1046 | print_subsystem_event_filter(system, s); |
4bda2d51 | 1047 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
1048 | |
1049 | kfree(s); | |
1050 | ||
1051 | return r; | |
1052 | } | |
1053 | ||
1054 | static ssize_t | |
1055 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1056 | loff_t *ppos) | |
1057 | { | |
ae63b31e | 1058 | struct ftrace_subsystem_dir *dir = filp->private_data; |
8b372562 | 1059 | char *buf; |
cfb180f3 TZ |
1060 | int err; |
1061 | ||
8b372562 | 1062 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
1063 | return -EINVAL; |
1064 | ||
8b372562 TZ |
1065 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
1066 | if (!buf) | |
cfb180f3 TZ |
1067 | return -ENOMEM; |
1068 | ||
8b372562 TZ |
1069 | if (copy_from_user(buf, ubuf, cnt)) { |
1070 | free_page((unsigned long) buf); | |
1071 | return -EFAULT; | |
cfb180f3 | 1072 | } |
8b372562 | 1073 | buf[cnt] = '\0'; |
cfb180f3 | 1074 | |
ae63b31e | 1075 | err = apply_subsystem_event_filter(dir, buf); |
8b372562 TZ |
1076 | free_page((unsigned long) buf); |
1077 | if (err < 0) | |
44e9c8b7 | 1078 | return err; |
cfb180f3 TZ |
1079 | |
1080 | *ppos += cnt; | |
1081 | ||
1082 | return cnt; | |
1083 | } | |
1084 | ||
d1b182a8 SR |
1085 | static ssize_t |
1086 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1087 | { | |
1088 | int (*func)(struct trace_seq *s) = filp->private_data; | |
1089 | struct trace_seq *s; | |
1090 | int r; | |
1091 | ||
1092 | if (*ppos) | |
1093 | return 0; | |
1094 | ||
1095 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1096 | if (!s) | |
1097 | return -ENOMEM; | |
1098 | ||
1099 | trace_seq_init(s); | |
1100 | ||
1101 | func(s); | |
1102 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
1103 | ||
1104 | kfree(s); | |
1105 | ||
1106 | return r; | |
1107 | } | |
1108 | ||
15075cac SR |
1109 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
1110 | static int ftrace_event_set_open(struct inode *inode, struct file *file); | |
1111 | ||
b77e38aa SR |
1112 | static const struct seq_operations show_event_seq_ops = { |
1113 | .start = t_start, | |
1114 | .next = t_next, | |
1115 | .show = t_show, | |
1116 | .stop = t_stop, | |
1117 | }; | |
1118 | ||
1119 | static const struct seq_operations show_set_event_seq_ops = { | |
1120 | .start = s_start, | |
1121 | .next = s_next, | |
1122 | .show = t_show, | |
1123 | .stop = t_stop, | |
1124 | }; | |
1125 | ||
2314c4ae | 1126 | static const struct file_operations ftrace_avail_fops = { |
15075cac | 1127 | .open = ftrace_event_avail_open, |
2314c4ae SR |
1128 | .read = seq_read, |
1129 | .llseek = seq_lseek, | |
1130 | .release = seq_release, | |
1131 | }; | |
1132 | ||
b77e38aa | 1133 | static const struct file_operations ftrace_set_event_fops = { |
15075cac | 1134 | .open = ftrace_event_set_open, |
b77e38aa SR |
1135 | .read = seq_read, |
1136 | .write = ftrace_event_write, | |
1137 | .llseek = seq_lseek, | |
1138 | .release = seq_release, | |
1139 | }; | |
1140 | ||
1473e441 SR |
1141 | static const struct file_operations ftrace_enable_fops = { |
1142 | .open = tracing_open_generic, | |
1143 | .read = event_enable_read, | |
1144 | .write = event_enable_write, | |
6038f373 | 1145 | .llseek = default_llseek, |
1473e441 SR |
1146 | }; |
1147 | ||
981d081e | 1148 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
1149 | .open = trace_format_open, |
1150 | .read = seq_read, | |
1151 | .llseek = seq_lseek, | |
1152 | .release = seq_release, | |
981d081e SR |
1153 | }; |
1154 | ||
23725aee PZ |
1155 | static const struct file_operations ftrace_event_id_fops = { |
1156 | .open = tracing_open_generic, | |
1157 | .read = event_id_read, | |
6038f373 | 1158 | .llseek = default_llseek, |
23725aee PZ |
1159 | }; |
1160 | ||
7ce7e424 TZ |
1161 | static const struct file_operations ftrace_event_filter_fops = { |
1162 | .open = tracing_open_generic, | |
1163 | .read = event_filter_read, | |
1164 | .write = event_filter_write, | |
6038f373 | 1165 | .llseek = default_llseek, |
7ce7e424 TZ |
1166 | }; |
1167 | ||
cfb180f3 | 1168 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 1169 | .open = subsystem_open, |
cfb180f3 TZ |
1170 | .read = subsystem_filter_read, |
1171 | .write = subsystem_filter_write, | |
6038f373 | 1172 | .llseek = default_llseek, |
e9dbfae5 | 1173 | .release = subsystem_release, |
cfb180f3 TZ |
1174 | }; |
1175 | ||
8ae79a13 | 1176 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 1177 | .open = subsystem_open, |
8ae79a13 SR |
1178 | .read = system_enable_read, |
1179 | .write = system_enable_write, | |
6038f373 | 1180 | .llseek = default_llseek, |
40ee4dff | 1181 | .release = subsystem_release, |
8ae79a13 SR |
1182 | }; |
1183 | ||
ae63b31e SR |
1184 | static const struct file_operations ftrace_tr_enable_fops = { |
1185 | .open = system_tr_open, | |
1186 | .read = system_enable_read, | |
1187 | .write = system_enable_write, | |
1188 | .llseek = default_llseek, | |
1189 | .release = subsystem_release, | |
1190 | }; | |
1191 | ||
d1b182a8 SR |
1192 | static const struct file_operations ftrace_show_header_fops = { |
1193 | .open = tracing_open_generic, | |
1194 | .read = show_header, | |
6038f373 | 1195 | .llseek = default_llseek, |
d1b182a8 SR |
1196 | }; |
1197 | ||
ae63b31e SR |
1198 | static int |
1199 | ftrace_event_open(struct inode *inode, struct file *file, | |
1200 | const struct seq_operations *seq_ops) | |
1473e441 | 1201 | { |
ae63b31e SR |
1202 | struct seq_file *m; |
1203 | int ret; | |
1473e441 | 1204 | |
ae63b31e SR |
1205 | ret = seq_open(file, seq_ops); |
1206 | if (ret < 0) | |
1207 | return ret; | |
1208 | m = file->private_data; | |
1209 | /* copy tr over to seq ops */ | |
1210 | m->private = inode->i_private; | |
1473e441 | 1211 | |
ae63b31e | 1212 | return ret; |
1473e441 SR |
1213 | } |
1214 | ||
15075cac SR |
1215 | static int |
1216 | ftrace_event_avail_open(struct inode *inode, struct file *file) | |
1217 | { | |
1218 | const struct seq_operations *seq_ops = &show_event_seq_ops; | |
1219 | ||
ae63b31e | 1220 | return ftrace_event_open(inode, file, seq_ops); |
15075cac SR |
1221 | } |
1222 | ||
1223 | static int | |
1224 | ftrace_event_set_open(struct inode *inode, struct file *file) | |
1225 | { | |
1226 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; | |
ae63b31e | 1227 | struct trace_array *tr = inode->i_private; |
15075cac SR |
1228 | |
1229 | if ((file->f_mode & FMODE_WRITE) && | |
1230 | (file->f_flags & O_TRUNC)) | |
ae63b31e | 1231 | ftrace_clear_events(tr); |
15075cac | 1232 | |
ae63b31e SR |
1233 | return ftrace_event_open(inode, file, seq_ops); |
1234 | } | |
1235 | ||
1236 | static struct event_subsystem * | |
1237 | create_new_subsystem(const char *name) | |
1238 | { | |
1239 | struct event_subsystem *system; | |
1240 | ||
1241 | /* need to create new entry */ | |
1242 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1243 | if (!system) | |
1244 | return NULL; | |
1245 | ||
1246 | system->ref_count = 1; | |
92edca07 | 1247 | system->name = name; |
ae63b31e SR |
1248 | |
1249 | system->filter = NULL; | |
1250 | ||
1251 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); | |
1252 | if (!system->filter) | |
1253 | goto out_free; | |
1254 | ||
1255 | list_add(&system->list, &event_subsystems); | |
1256 | ||
1257 | return system; | |
1258 | ||
1259 | out_free: | |
ae63b31e SR |
1260 | kfree(system); |
1261 | return NULL; | |
15075cac SR |
1262 | } |
1263 | ||
6ecc2d1c | 1264 | static struct dentry * |
ae63b31e SR |
1265 | event_subsystem_dir(struct trace_array *tr, const char *name, |
1266 | struct ftrace_event_file *file, struct dentry *parent) | |
6ecc2d1c | 1267 | { |
ae63b31e | 1268 | struct ftrace_subsystem_dir *dir; |
6ecc2d1c | 1269 | struct event_subsystem *system; |
e1112b4d | 1270 | struct dentry *entry; |
6ecc2d1c SR |
1271 | |
1272 | /* First see if we did not already create this dir */ | |
ae63b31e SR |
1273 | list_for_each_entry(dir, &tr->systems, list) { |
1274 | system = dir->subsystem; | |
dc82ec98 | 1275 | if (strcmp(system->name, name) == 0) { |
ae63b31e SR |
1276 | dir->nr_events++; |
1277 | file->system = dir; | |
1278 | return dir->entry; | |
dc82ec98 | 1279 | } |
6ecc2d1c SR |
1280 | } |
1281 | ||
ae63b31e SR |
1282 | /* Now see if the system itself exists. */ |
1283 | list_for_each_entry(system, &event_subsystems, list) { | |
1284 | if (strcmp(system->name, name) == 0) | |
1285 | break; | |
6ecc2d1c | 1286 | } |
ae63b31e SR |
1287 | /* Reset system variable when not found */ |
1288 | if (&system->list == &event_subsystems) | |
1289 | system = NULL; | |
6ecc2d1c | 1290 | |
ae63b31e SR |
1291 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
1292 | if (!dir) | |
1293 | goto out_fail; | |
6ecc2d1c | 1294 | |
ae63b31e SR |
1295 | if (!system) { |
1296 | system = create_new_subsystem(name); | |
1297 | if (!system) | |
1298 | goto out_free; | |
1299 | } else | |
1300 | __get_system(system); | |
1301 | ||
1302 | dir->entry = debugfs_create_dir(name, parent); | |
1303 | if (!dir->entry) { | |
1304 | pr_warning("Failed to create system directory %s\n", name); | |
1305 | __put_system(system); | |
1306 | goto out_free; | |
6d723736 SR |
1307 | } |
1308 | ||
ae63b31e SR |
1309 | dir->tr = tr; |
1310 | dir->ref_count = 1; | |
1311 | dir->nr_events = 1; | |
1312 | dir->subsystem = system; | |
1313 | file->system = dir; | |
8b372562 | 1314 | |
ae63b31e | 1315 | entry = debugfs_create_file("filter", 0644, dir->entry, dir, |
e1112b4d | 1316 | &ftrace_subsystem_filter_fops); |
8b372562 TZ |
1317 | if (!entry) { |
1318 | kfree(system->filter); | |
1319 | system->filter = NULL; | |
ae63b31e | 1320 | pr_warning("Could not create debugfs '%s/filter' entry\n", name); |
8b372562 | 1321 | } |
e1112b4d | 1322 | |
ae63b31e | 1323 | trace_create_file("enable", 0644, dir->entry, dir, |
f3f3f009 | 1324 | &ftrace_system_enable_fops); |
8ae79a13 | 1325 | |
ae63b31e SR |
1326 | list_add(&dir->list, &tr->systems); |
1327 | ||
1328 | return dir->entry; | |
1329 | ||
1330 | out_free: | |
1331 | kfree(dir); | |
1332 | out_fail: | |
1333 | /* Only print this message if failed on memory allocation */ | |
1334 | if (!dir || !system) | |
1335 | pr_warning("No memory to create event subsystem %s\n", | |
1336 | name); | |
1337 | return NULL; | |
6ecc2d1c SR |
1338 | } |
1339 | ||
1473e441 | 1340 | static int |
ae63b31e SR |
1341 | event_create_dir(struct dentry *parent, |
1342 | struct ftrace_event_file *file, | |
701970b3 SR |
1343 | const struct file_operations *id, |
1344 | const struct file_operations *enable, | |
1345 | const struct file_operations *filter, | |
1346 | const struct file_operations *format) | |
1473e441 | 1347 | { |
ae63b31e SR |
1348 | struct ftrace_event_call *call = file->event_call; |
1349 | struct trace_array *tr = file->tr; | |
2e33af02 | 1350 | struct list_head *head; |
ae63b31e | 1351 | struct dentry *d_events; |
fd994989 | 1352 | int ret; |
1473e441 | 1353 | |
6ecc2d1c SR |
1354 | /* |
1355 | * If the trace point header did not define TRACE_SYSTEM | |
1356 | * then the system would be called "TRACE_SYSTEM". | |
1357 | */ | |
ae63b31e SR |
1358 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { |
1359 | d_events = event_subsystem_dir(tr, call->class->system, file, parent); | |
1360 | if (!d_events) | |
1361 | return -ENOMEM; | |
1362 | } else | |
1363 | d_events = parent; | |
1364 | ||
1365 | file->dir = debugfs_create_dir(call->name, d_events); | |
1366 | if (!file->dir) { | |
1367 | pr_warning("Could not create debugfs '%s' directory\n", | |
1368 | call->name); | |
1473e441 SR |
1369 | return -1; |
1370 | } | |
1371 | ||
9b63776f | 1372 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
ae63b31e | 1373 | trace_create_file("enable", 0644, file->dir, file, |
f3f3f009 | 1374 | enable); |
1473e441 | 1375 | |
2239291a | 1376 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 1377 | if (call->event.type && call->class->reg) |
ae63b31e | 1378 | trace_create_file("id", 0444, file->dir, call, |
f3f3f009 | 1379 | id); |
2239291a | 1380 | #endif |
23725aee | 1381 | |
c9d932cf LZ |
1382 | /* |
1383 | * Other events may have the same class. Only update | |
1384 | * the fields if they are not already defined. | |
1385 | */ | |
1386 | head = trace_get_fields(call); | |
1387 | if (list_empty(head)) { | |
1388 | ret = call->class->define_fields(call); | |
1389 | if (ret < 0) { | |
1390 | pr_warning("Could not initialize trace point" | |
1391 | " events/%s\n", call->name); | |
ae63b31e | 1392 | return -1; |
cf027f64 TZ |
1393 | } |
1394 | } | |
ae63b31e | 1395 | trace_create_file("filter", 0644, file->dir, call, |
c9d932cf | 1396 | filter); |
cf027f64 | 1397 | |
ae63b31e | 1398 | trace_create_file("format", 0444, file->dir, call, |
f3f3f009 | 1399 | format); |
6d723736 SR |
1400 | |
1401 | return 0; | |
1402 | } | |
1403 | ||
ae63b31e SR |
1404 | static void remove_subsystem(struct ftrace_subsystem_dir *dir) |
1405 | { | |
1406 | if (!dir) | |
1407 | return; | |
1408 | ||
1409 | if (!--dir->nr_events) { | |
1410 | debugfs_remove_recursive(dir->entry); | |
1411 | list_del(&dir->list); | |
1412 | __put_system_dir(dir); | |
1413 | } | |
1414 | } | |
1415 | ||
1416 | static void remove_event_from_tracers(struct ftrace_event_call *call) | |
1417 | { | |
1418 | struct ftrace_event_file *file; | |
1419 | struct trace_array *tr; | |
1420 | ||
1421 | do_for_each_event_file_safe(tr, file) { | |
1422 | ||
1423 | if (file->event_call != call) | |
1424 | continue; | |
1425 | ||
1426 | list_del(&file->list); | |
1427 | debugfs_remove_recursive(file->dir); | |
1428 | remove_subsystem(file->system); | |
d1a29143 | 1429 | kmem_cache_free(file_cachep, file); |
ae63b31e SR |
1430 | |
1431 | /* | |
1432 | * The do_for_each_event_file_safe() is | |
1433 | * a double loop. After finding the call for this | |
1434 | * trace_array, we use break to jump to the next | |
1435 | * trace_array. | |
1436 | */ | |
1437 | break; | |
1438 | } while_for_each_event_file(); | |
1439 | } | |
1440 | ||
8781915a EG |
1441 | static void event_remove(struct ftrace_event_call *call) |
1442 | { | |
ae63b31e SR |
1443 | struct trace_array *tr; |
1444 | struct ftrace_event_file *file; | |
1445 | ||
1446 | do_for_each_event_file(tr, file) { | |
1447 | if (file->event_call != call) | |
1448 | continue; | |
1449 | ftrace_event_enable_disable(file, 0); | |
1450 | /* | |
1451 | * The do_for_each_event_file() is | |
1452 | * a double loop. After finding the call for this | |
1453 | * trace_array, we use break to jump to the next | |
1454 | * trace_array. | |
1455 | */ | |
1456 | break; | |
1457 | } while_for_each_event_file(); | |
1458 | ||
8781915a EG |
1459 | if (call->event.funcs) |
1460 | __unregister_ftrace_event(&call->event); | |
ae63b31e | 1461 | remove_event_from_tracers(call); |
8781915a EG |
1462 | list_del(&call->list); |
1463 | } | |
1464 | ||
1465 | static int event_init(struct ftrace_event_call *call) | |
1466 | { | |
1467 | int ret = 0; | |
1468 | ||
1469 | if (WARN_ON(!call->name)) | |
1470 | return -EINVAL; | |
1471 | ||
1472 | if (call->class->raw_init) { | |
1473 | ret = call->class->raw_init(call); | |
1474 | if (ret < 0 && ret != -ENOSYS) | |
1475 | pr_warn("Could not initialize trace events/%s\n", | |
1476 | call->name); | |
1477 | } | |
1478 | ||
1479 | return ret; | |
1480 | } | |
1481 | ||
67ead0a6 | 1482 | static int |
ae63b31e | 1483 | __register_event(struct ftrace_event_call *call, struct module *mod) |
bd1a5c84 | 1484 | { |
bd1a5c84 | 1485 | int ret; |
6d723736 | 1486 | |
8781915a EG |
1487 | ret = event_init(call); |
1488 | if (ret < 0) | |
1489 | return ret; | |
701970b3 | 1490 | |
ae63b31e | 1491 | list_add(&call->list, &ftrace_events); |
67ead0a6 | 1492 | call->mod = mod; |
88f70d75 | 1493 | |
ae63b31e | 1494 | return 0; |
bd1a5c84 MH |
1495 | } |
1496 | ||
ae63b31e SR |
1497 | /* Add an event to a trace directory */ |
1498 | static int | |
1499 | __trace_add_new_event(struct ftrace_event_call *call, | |
1500 | struct trace_array *tr, | |
1501 | const struct file_operations *id, | |
1502 | const struct file_operations *enable, | |
1503 | const struct file_operations *filter, | |
1504 | const struct file_operations *format) | |
1505 | { | |
1506 | struct ftrace_event_file *file; | |
1507 | ||
d1a29143 | 1508 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); |
ae63b31e SR |
1509 | if (!file) |
1510 | return -ENOMEM; | |
1511 | ||
1512 | file->event_call = call; | |
1513 | file->tr = tr; | |
1514 | list_add(&file->list, &tr->events); | |
1515 | ||
1516 | return event_create_dir(tr->event_dir, file, id, enable, filter, format); | |
1517 | } | |
1518 | ||
77248221 SR |
1519 | /* |
1520 | * Just create a decriptor for early init. A descriptor is required | |
1521 | * for enabling events at boot. We want to enable events before | |
1522 | * the filesystem is initialized. | |
1523 | */ | |
1524 | static __init int | |
1525 | __trace_early_add_new_event(struct ftrace_event_call *call, | |
1526 | struct trace_array *tr) | |
1527 | { | |
1528 | struct ftrace_event_file *file; | |
1529 | ||
d1a29143 | 1530 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); |
77248221 SR |
1531 | if (!file) |
1532 | return -ENOMEM; | |
1533 | ||
1534 | file->event_call = call; | |
1535 | file->tr = tr; | |
1536 | list_add(&file->list, &tr->events); | |
1537 | ||
1538 | return 0; | |
1539 | } | |
1540 | ||
ae63b31e SR |
1541 | struct ftrace_module_file_ops; |
1542 | static void __add_event_to_tracers(struct ftrace_event_call *call, | |
1543 | struct ftrace_module_file_ops *file_ops); | |
1544 | ||
bd1a5c84 MH |
1545 | /* Add an additional event_call dynamically */ |
1546 | int trace_add_event_call(struct ftrace_event_call *call) | |
1547 | { | |
1548 | int ret; | |
1549 | mutex_lock(&event_mutex); | |
701970b3 | 1550 | |
ae63b31e SR |
1551 | ret = __register_event(call, NULL); |
1552 | if (ret >= 0) | |
1553 | __add_event_to_tracers(call, NULL); | |
a2ca5e03 | 1554 | |
ae63b31e SR |
1555 | mutex_unlock(&event_mutex); |
1556 | return ret; | |
a2ca5e03 FW |
1557 | } |
1558 | ||
4fead8e4 MH |
1559 | /* |
1560 | * Must be called under locking both of event_mutex and trace_event_mutex. | |
1561 | */ | |
bd1a5c84 MH |
1562 | static void __trace_remove_event_call(struct ftrace_event_call *call) |
1563 | { | |
8781915a | 1564 | event_remove(call); |
bd1a5c84 MH |
1565 | trace_destroy_fields(call); |
1566 | destroy_preds(call); | |
bd1a5c84 MH |
1567 | } |
1568 | ||
1569 | /* Remove an event_call */ | |
1570 | void trace_remove_event_call(struct ftrace_event_call *call) | |
1571 | { | |
1572 | mutex_lock(&event_mutex); | |
4fead8e4 | 1573 | down_write(&trace_event_mutex); |
bd1a5c84 | 1574 | __trace_remove_event_call(call); |
4fead8e4 | 1575 | up_write(&trace_event_mutex); |
bd1a5c84 MH |
1576 | mutex_unlock(&event_mutex); |
1577 | } | |
1578 | ||
1579 | #define for_each_event(event, start, end) \ | |
1580 | for (event = start; \ | |
1581 | (unsigned long)event < (unsigned long)end; \ | |
1582 | event++) | |
1583 | ||
1584 | #ifdef CONFIG_MODULES | |
1585 | ||
1586 | static LIST_HEAD(ftrace_module_file_list); | |
1587 | ||
1588 | /* | |
1589 | * Modules must own their file_operations to keep up with | |
1590 | * reference counting. | |
1591 | */ | |
1592 | struct ftrace_module_file_ops { | |
1593 | struct list_head list; | |
1594 | struct module *mod; | |
1595 | struct file_operations id; | |
1596 | struct file_operations enable; | |
1597 | struct file_operations format; | |
1598 | struct file_operations filter; | |
1599 | }; | |
1600 | ||
315326c1 SRRH |
1601 | static struct ftrace_module_file_ops * |
1602 | find_ftrace_file_ops(struct ftrace_module_file_ops *file_ops, struct module *mod) | |
ae63b31e | 1603 | { |
315326c1 SRRH |
1604 | /* |
1605 | * As event_calls are added in groups by module, | |
1606 | * when we find one file_ops, we don't need to search for | |
1607 | * each call in that module, as the rest should be the | |
1608 | * same. Only search for a new one if the last one did | |
1609 | * not match. | |
1610 | */ | |
1611 | if (file_ops && mod == file_ops->mod) | |
1612 | return file_ops; | |
ae63b31e SR |
1613 | |
1614 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1615 | if (file_ops->mod == mod) | |
1616 | return file_ops; | |
1617 | } | |
1618 | return NULL; | |
1619 | } | |
1620 | ||
701970b3 SR |
1621 | static struct ftrace_module_file_ops * |
1622 | trace_create_file_ops(struct module *mod) | |
1623 | { | |
1624 | struct ftrace_module_file_ops *file_ops; | |
1625 | ||
1626 | /* | |
1627 | * This is a bit of a PITA. To allow for correct reference | |
1628 | * counting, modules must "own" their file_operations. | |
1629 | * To do this, we allocate the file operations that will be | |
1630 | * used in the event directory. | |
1631 | */ | |
1632 | ||
1633 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1634 | if (!file_ops) | |
1635 | return NULL; | |
1636 | ||
1637 | file_ops->mod = mod; | |
1638 | ||
1639 | file_ops->id = ftrace_event_id_fops; | |
1640 | file_ops->id.owner = mod; | |
1641 | ||
1642 | file_ops->enable = ftrace_enable_fops; | |
1643 | file_ops->enable.owner = mod; | |
1644 | ||
1645 | file_ops->filter = ftrace_event_filter_fops; | |
1646 | file_ops->filter.owner = mod; | |
1647 | ||
1648 | file_ops->format = ftrace_event_format_fops; | |
1649 | file_ops->format.owner = mod; | |
1650 | ||
1651 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1652 | ||
1653 | return file_ops; | |
1654 | } | |
1655 | ||
6d723736 SR |
1656 | static void trace_module_add_events(struct module *mod) |
1657 | { | |
701970b3 | 1658 | struct ftrace_module_file_ops *file_ops = NULL; |
e4a9ea5e | 1659 | struct ftrace_event_call **call, **start, **end; |
6d723736 SR |
1660 | |
1661 | start = mod->trace_events; | |
1662 | end = mod->trace_events + mod->num_trace_events; | |
1663 | ||
1664 | if (start == end) | |
1665 | return; | |
1666 | ||
67ead0a6 LZ |
1667 | file_ops = trace_create_file_ops(mod); |
1668 | if (!file_ops) | |
6d723736 SR |
1669 | return; |
1670 | ||
1671 | for_each_event(call, start, end) { | |
ae63b31e SR |
1672 | __register_event(*call, mod); |
1673 | __add_event_to_tracers(*call, file_ops); | |
6d723736 SR |
1674 | } |
1675 | } | |
1676 | ||
1677 | static void trace_module_remove_events(struct module *mod) | |
1678 | { | |
701970b3 | 1679 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1680 | struct ftrace_event_call *call, *p; |
575380da | 1681 | bool clear_trace = false; |
6d723736 | 1682 | |
110bf2b7 | 1683 | down_write(&trace_event_mutex); |
6d723736 SR |
1684 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1685 | if (call->mod == mod) { | |
575380da SRRH |
1686 | if (call->flags & TRACE_EVENT_FL_WAS_ENABLED) |
1687 | clear_trace = true; | |
bd1a5c84 | 1688 | __trace_remove_event_call(call); |
6d723736 SR |
1689 | } |
1690 | } | |
701970b3 SR |
1691 | |
1692 | /* Now free the file_operations */ | |
1693 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1694 | if (file_ops->mod == mod) | |
1695 | break; | |
1696 | } | |
1697 | if (&file_ops->list != &ftrace_module_file_list) { | |
1698 | list_del(&file_ops->list); | |
1699 | kfree(file_ops); | |
1700 | } | |
873c642f | 1701 | up_write(&trace_event_mutex); |
9456f0fa SR |
1702 | |
1703 | /* | |
1704 | * It is safest to reset the ring buffer if the module being unloaded | |
873c642f SRRH |
1705 | * registered any events that were used. The only worry is if |
1706 | * a new module gets loaded, and takes on the same id as the events | |
1707 | * of this module. When printing out the buffer, traced events left | |
1708 | * over from this module may be passed to the new module events and | |
1709 | * unexpected results may occur. | |
9456f0fa | 1710 | */ |
575380da | 1711 | if (clear_trace) |
873c642f | 1712 | tracing_reset_all_online_cpus(); |
6d723736 SR |
1713 | } |
1714 | ||
61f919a1 SR |
1715 | static int trace_module_notify(struct notifier_block *self, |
1716 | unsigned long val, void *data) | |
6d723736 SR |
1717 | { |
1718 | struct module *mod = data; | |
1719 | ||
1720 | mutex_lock(&event_mutex); | |
1721 | switch (val) { | |
1722 | case MODULE_STATE_COMING: | |
1723 | trace_module_add_events(mod); | |
1724 | break; | |
1725 | case MODULE_STATE_GOING: | |
1726 | trace_module_remove_events(mod); | |
1727 | break; | |
1728 | } | |
1729 | mutex_unlock(&event_mutex); | |
fd994989 | 1730 | |
1473e441 SR |
1731 | return 0; |
1732 | } | |
315326c1 SRRH |
1733 | |
1734 | static int | |
1735 | __trace_add_new_mod_event(struct ftrace_event_call *call, | |
1736 | struct trace_array *tr, | |
1737 | struct ftrace_module_file_ops *file_ops) | |
1738 | { | |
1739 | return __trace_add_new_event(call, tr, | |
1740 | &file_ops->id, &file_ops->enable, | |
1741 | &file_ops->filter, &file_ops->format); | |
1742 | } | |
1743 | ||
61f919a1 | 1744 | #else |
315326c1 SRRH |
1745 | static inline struct ftrace_module_file_ops * |
1746 | find_ftrace_file_ops(struct ftrace_module_file_ops *file_ops, struct module *mod) | |
ae63b31e SR |
1747 | { |
1748 | return NULL; | |
1749 | } | |
315326c1 SRRH |
1750 | static inline int trace_module_notify(struct notifier_block *self, |
1751 | unsigned long val, void *data) | |
61f919a1 SR |
1752 | { |
1753 | return 0; | |
1754 | } | |
315326c1 SRRH |
1755 | static inline int |
1756 | __trace_add_new_mod_event(struct ftrace_event_call *call, | |
1757 | struct trace_array *tr, | |
1758 | struct ftrace_module_file_ops *file_ops) | |
1759 | { | |
1760 | return -ENODEV; | |
1761 | } | |
61f919a1 | 1762 | #endif /* CONFIG_MODULES */ |
1473e441 | 1763 | |
ae63b31e SR |
1764 | /* Create a new event directory structure for a trace directory. */ |
1765 | static void | |
1766 | __trace_add_event_dirs(struct trace_array *tr) | |
1767 | { | |
1768 | struct ftrace_module_file_ops *file_ops = NULL; | |
1769 | struct ftrace_event_call *call; | |
1770 | int ret; | |
1771 | ||
1772 | list_for_each_entry(call, &ftrace_events, list) { | |
1773 | if (call->mod) { | |
1774 | /* | |
1775 | * Directories for events by modules need to | |
1776 | * keep module ref counts when opened (as we don't | |
1777 | * want the module to disappear when reading one | |
1778 | * of these files). The file_ops keep account of | |
1779 | * the module ref count. | |
ae63b31e | 1780 | */ |
315326c1 | 1781 | file_ops = find_ftrace_file_ops(file_ops, call->mod); |
ae63b31e SR |
1782 | if (!file_ops) |
1783 | continue; /* Warn? */ | |
315326c1 | 1784 | ret = __trace_add_new_mod_event(call, tr, file_ops); |
ae63b31e SR |
1785 | if (ret < 0) |
1786 | pr_warning("Could not create directory for event %s\n", | |
1787 | call->name); | |
1788 | continue; | |
1789 | } | |
1790 | ret = __trace_add_new_event(call, tr, | |
1791 | &ftrace_event_id_fops, | |
1792 | &ftrace_enable_fops, | |
1793 | &ftrace_event_filter_fops, | |
1794 | &ftrace_event_format_fops); | |
1795 | if (ret < 0) | |
1796 | pr_warning("Could not create directory for event %s\n", | |
1797 | call->name); | |
1798 | } | |
1799 | } | |
1800 | ||
3cd715de SRRH |
1801 | #ifdef CONFIG_DYNAMIC_FTRACE |
1802 | ||
1803 | /* Avoid typos */ | |
1804 | #define ENABLE_EVENT_STR "enable_event" | |
1805 | #define DISABLE_EVENT_STR "disable_event" | |
1806 | ||
1807 | struct event_probe_data { | |
1808 | struct ftrace_event_file *file; | |
1809 | unsigned long count; | |
1810 | int ref; | |
1811 | bool enable; | |
1812 | }; | |
1813 | ||
1814 | static struct ftrace_event_file * | |
1815 | find_event_file(struct trace_array *tr, const char *system, const char *event) | |
1816 | { | |
1817 | struct ftrace_event_file *file; | |
1818 | struct ftrace_event_call *call; | |
1819 | ||
1820 | list_for_each_entry(file, &tr->events, list) { | |
1821 | ||
1822 | call = file->event_call; | |
1823 | ||
1824 | if (!call->name || !call->class || !call->class->reg) | |
1825 | continue; | |
1826 | ||
1827 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) | |
1828 | continue; | |
1829 | ||
1830 | if (strcmp(event, call->name) == 0 && | |
1831 | strcmp(system, call->class->system) == 0) | |
1832 | return file; | |
1833 | } | |
1834 | return NULL; | |
1835 | } | |
1836 | ||
1837 | static void | |
1838 | event_enable_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
1839 | { | |
1840 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
1841 | struct event_probe_data *data = *pdata; | |
1842 | ||
1843 | if (!data) | |
1844 | return; | |
1845 | ||
1846 | if (data->enable) | |
1847 | clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &data->file->flags); | |
1848 | else | |
1849 | set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &data->file->flags); | |
1850 | } | |
1851 | ||
1852 | static void | |
1853 | event_enable_count_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
1854 | { | |
1855 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
1856 | struct event_probe_data *data = *pdata; | |
1857 | ||
1858 | if (!data) | |
1859 | return; | |
1860 | ||
1861 | if (!data->count) | |
1862 | return; | |
1863 | ||
1864 | /* Skip if the event is in a state we want to switch to */ | |
1865 | if (data->enable == !(data->file->flags & FTRACE_EVENT_FL_SOFT_DISABLED)) | |
1866 | return; | |
1867 | ||
1868 | if (data->count != -1) | |
1869 | (data->count)--; | |
1870 | ||
1871 | event_enable_probe(ip, parent_ip, _data); | |
1872 | } | |
1873 | ||
1874 | static int | |
1875 | event_enable_print(struct seq_file *m, unsigned long ip, | |
1876 | struct ftrace_probe_ops *ops, void *_data) | |
1877 | { | |
1878 | struct event_probe_data *data = _data; | |
1879 | ||
1880 | seq_printf(m, "%ps:", (void *)ip); | |
1881 | ||
1882 | seq_printf(m, "%s:%s:%s", | |
1883 | data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR, | |
1884 | data->file->event_call->class->system, | |
1885 | data->file->event_call->name); | |
1886 | ||
1887 | if (data->count == -1) | |
1888 | seq_printf(m, ":unlimited\n"); | |
1889 | else | |
1890 | seq_printf(m, ":count=%ld\n", data->count); | |
1891 | ||
1892 | return 0; | |
1893 | } | |
1894 | ||
1895 | static int | |
1896 | event_enable_init(struct ftrace_probe_ops *ops, unsigned long ip, | |
1897 | void **_data) | |
1898 | { | |
1899 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
1900 | struct event_probe_data *data = *pdata; | |
1901 | ||
1902 | data->ref++; | |
1903 | return 0; | |
1904 | } | |
1905 | ||
1906 | static void | |
1907 | event_enable_free(struct ftrace_probe_ops *ops, unsigned long ip, | |
1908 | void **_data) | |
1909 | { | |
1910 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
1911 | struct event_probe_data *data = *pdata; | |
1912 | ||
1913 | if (WARN_ON_ONCE(data->ref <= 0)) | |
1914 | return; | |
1915 | ||
1916 | data->ref--; | |
1917 | if (!data->ref) { | |
1918 | /* Remove the SOFT_MODE flag */ | |
1919 | __ftrace_event_enable_disable(data->file, 0, 1); | |
1920 | module_put(data->file->event_call->mod); | |
1921 | kfree(data); | |
1922 | } | |
1923 | *pdata = NULL; | |
1924 | } | |
1925 | ||
1926 | static struct ftrace_probe_ops event_enable_probe_ops = { | |
1927 | .func = event_enable_probe, | |
1928 | .print = event_enable_print, | |
1929 | .init = event_enable_init, | |
1930 | .free = event_enable_free, | |
1931 | }; | |
1932 | ||
1933 | static struct ftrace_probe_ops event_enable_count_probe_ops = { | |
1934 | .func = event_enable_count_probe, | |
1935 | .print = event_enable_print, | |
1936 | .init = event_enable_init, | |
1937 | .free = event_enable_free, | |
1938 | }; | |
1939 | ||
1940 | static struct ftrace_probe_ops event_disable_probe_ops = { | |
1941 | .func = event_enable_probe, | |
1942 | .print = event_enable_print, | |
1943 | .init = event_enable_init, | |
1944 | .free = event_enable_free, | |
1945 | }; | |
1946 | ||
1947 | static struct ftrace_probe_ops event_disable_count_probe_ops = { | |
1948 | .func = event_enable_count_probe, | |
1949 | .print = event_enable_print, | |
1950 | .init = event_enable_init, | |
1951 | .free = event_enable_free, | |
1952 | }; | |
1953 | ||
1954 | static int | |
1955 | event_enable_func(struct ftrace_hash *hash, | |
1956 | char *glob, char *cmd, char *param, int enabled) | |
1957 | { | |
1958 | struct trace_array *tr = top_trace_array(); | |
1959 | struct ftrace_event_file *file; | |
1960 | struct ftrace_probe_ops *ops; | |
1961 | struct event_probe_data *data; | |
1962 | const char *system; | |
1963 | const char *event; | |
1964 | char *number; | |
1965 | bool enable; | |
1966 | int ret; | |
1967 | ||
1968 | /* hash funcs only work with set_ftrace_filter */ | |
1969 | if (!enabled) | |
1970 | return -EINVAL; | |
1971 | ||
1972 | if (!param) | |
1973 | return -EINVAL; | |
1974 | ||
1975 | system = strsep(¶m, ":"); | |
1976 | if (!param) | |
1977 | return -EINVAL; | |
1978 | ||
1979 | event = strsep(¶m, ":"); | |
1980 | ||
1981 | mutex_lock(&event_mutex); | |
1982 | ||
1983 | ret = -EINVAL; | |
1984 | file = find_event_file(tr, system, event); | |
1985 | if (!file) | |
1986 | goto out; | |
1987 | ||
1988 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; | |
1989 | ||
1990 | if (enable) | |
1991 | ops = param ? &event_enable_count_probe_ops : &event_enable_probe_ops; | |
1992 | else | |
1993 | ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops; | |
1994 | ||
1995 | if (glob[0] == '!') { | |
1996 | unregister_ftrace_function_probe_func(glob+1, ops); | |
1997 | ret = 0; | |
1998 | goto out; | |
1999 | } | |
2000 | ||
2001 | ret = -ENOMEM; | |
2002 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
2003 | if (!data) | |
2004 | goto out; | |
2005 | ||
2006 | data->enable = enable; | |
2007 | data->count = -1; | |
2008 | data->file = file; | |
2009 | ||
2010 | if (!param) | |
2011 | goto out_reg; | |
2012 | ||
2013 | number = strsep(¶m, ":"); | |
2014 | ||
2015 | ret = -EINVAL; | |
2016 | if (!strlen(number)) | |
2017 | goto out_free; | |
2018 | ||
2019 | /* | |
2020 | * We use the callback data field (which is a pointer) | |
2021 | * as our counter. | |
2022 | */ | |
2023 | ret = kstrtoul(number, 0, &data->count); | |
2024 | if (ret) | |
2025 | goto out_free; | |
2026 | ||
2027 | out_reg: | |
2028 | /* Don't let event modules unload while probe registered */ | |
2029 | ret = try_module_get(file->event_call->mod); | |
2030 | if (!ret) | |
2031 | goto out_free; | |
2032 | ||
2033 | ret = __ftrace_event_enable_disable(file, 1, 1); | |
2034 | if (ret < 0) | |
2035 | goto out_put; | |
2036 | ret = register_ftrace_function_probe(glob, ops, data); | |
2037 | if (!ret) | |
2038 | goto out_disable; | |
2039 | out: | |
2040 | mutex_unlock(&event_mutex); | |
2041 | return ret; | |
2042 | ||
2043 | out_disable: | |
2044 | __ftrace_event_enable_disable(file, 0, 1); | |
2045 | out_put: | |
2046 | module_put(file->event_call->mod); | |
2047 | out_free: | |
2048 | kfree(data); | |
2049 | goto out; | |
2050 | } | |
2051 | ||
2052 | static struct ftrace_func_command event_enable_cmd = { | |
2053 | .name = ENABLE_EVENT_STR, | |
2054 | .func = event_enable_func, | |
2055 | }; | |
2056 | ||
2057 | static struct ftrace_func_command event_disable_cmd = { | |
2058 | .name = DISABLE_EVENT_STR, | |
2059 | .func = event_enable_func, | |
2060 | }; | |
2061 | ||
2062 | static __init int register_event_cmds(void) | |
2063 | { | |
2064 | int ret; | |
2065 | ||
2066 | ret = register_ftrace_command(&event_enable_cmd); | |
2067 | if (WARN_ON(ret < 0)) | |
2068 | return ret; | |
2069 | ret = register_ftrace_command(&event_disable_cmd); | |
2070 | if (WARN_ON(ret < 0)) | |
2071 | unregister_ftrace_command(&event_enable_cmd); | |
2072 | return ret; | |
2073 | } | |
2074 | #else | |
2075 | static inline int register_event_cmds(void) { return 0; } | |
2076 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
2077 | ||
77248221 SR |
2078 | /* |
2079 | * The top level array has already had its ftrace_event_file | |
2080 | * descriptors created in order to allow for early events to | |
2081 | * be recorded. This function is called after the debugfs has been | |
2082 | * initialized, and we now have to create the files associated | |
2083 | * to the events. | |
2084 | */ | |
2085 | static __init void | |
2086 | __trace_early_add_event_dirs(struct trace_array *tr) | |
2087 | { | |
2088 | struct ftrace_event_file *file; | |
2089 | int ret; | |
2090 | ||
2091 | ||
2092 | list_for_each_entry(file, &tr->events, list) { | |
2093 | ret = event_create_dir(tr->event_dir, file, | |
2094 | &ftrace_event_id_fops, | |
2095 | &ftrace_enable_fops, | |
2096 | &ftrace_event_filter_fops, | |
2097 | &ftrace_event_format_fops); | |
2098 | if (ret < 0) | |
2099 | pr_warning("Could not create directory for event %s\n", | |
2100 | file->event_call->name); | |
2101 | } | |
2102 | } | |
2103 | ||
2104 | /* | |
2105 | * For early boot up, the top trace array requires to have | |
2106 | * a list of events that can be enabled. This must be done before | |
2107 | * the filesystem is set up in order to allow events to be traced | |
2108 | * early. | |
2109 | */ | |
2110 | static __init void | |
2111 | __trace_early_add_events(struct trace_array *tr) | |
2112 | { | |
2113 | struct ftrace_event_call *call; | |
2114 | int ret; | |
2115 | ||
2116 | list_for_each_entry(call, &ftrace_events, list) { | |
2117 | /* Early boot up should not have any modules loaded */ | |
2118 | if (WARN_ON_ONCE(call->mod)) | |
2119 | continue; | |
2120 | ||
2121 | ret = __trace_early_add_new_event(call, tr); | |
2122 | if (ret < 0) | |
2123 | pr_warning("Could not create early event %s\n", | |
2124 | call->name); | |
2125 | } | |
2126 | } | |
2127 | ||
0c8916c3 SR |
2128 | /* Remove the event directory structure for a trace directory. */ |
2129 | static void | |
2130 | __trace_remove_event_dirs(struct trace_array *tr) | |
2131 | { | |
2132 | struct ftrace_event_file *file, *next; | |
2133 | ||
2134 | list_for_each_entry_safe(file, next, &tr->events, list) { | |
2135 | list_del(&file->list); | |
2136 | debugfs_remove_recursive(file->dir); | |
2137 | remove_subsystem(file->system); | |
d1a29143 | 2138 | kmem_cache_free(file_cachep, file); |
0c8916c3 SR |
2139 | } |
2140 | } | |
2141 | ||
ae63b31e SR |
2142 | static void |
2143 | __add_event_to_tracers(struct ftrace_event_call *call, | |
2144 | struct ftrace_module_file_ops *file_ops) | |
2145 | { | |
2146 | struct trace_array *tr; | |
2147 | ||
2148 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
2149 | if (file_ops) | |
315326c1 | 2150 | __trace_add_new_mod_event(call, tr, file_ops); |
ae63b31e SR |
2151 | else |
2152 | __trace_add_new_event(call, tr, | |
2153 | &ftrace_event_id_fops, | |
2154 | &ftrace_enable_fops, | |
2155 | &ftrace_event_filter_fops, | |
2156 | &ftrace_event_format_fops); | |
2157 | } | |
2158 | } | |
2159 | ||
ec827c7e | 2160 | static struct notifier_block trace_module_nb = { |
6d723736 SR |
2161 | .notifier_call = trace_module_notify, |
2162 | .priority = 0, | |
2163 | }; | |
2164 | ||
e4a9ea5e SR |
2165 | extern struct ftrace_event_call *__start_ftrace_events[]; |
2166 | extern struct ftrace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 2167 | |
020e5f85 LZ |
2168 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
2169 | ||
2170 | static __init int setup_trace_event(char *str) | |
2171 | { | |
2172 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
55034cd6 SRRH |
2173 | ring_buffer_expanded = true; |
2174 | tracing_selftest_disabled = true; | |
020e5f85 LZ |
2175 | |
2176 | return 1; | |
2177 | } | |
2178 | __setup("trace_event=", setup_trace_event); | |
2179 | ||
77248221 SR |
2180 | /* Expects to have event_mutex held when called */ |
2181 | static int | |
2182 | create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) | |
ae63b31e SR |
2183 | { |
2184 | struct dentry *d_events; | |
2185 | struct dentry *entry; | |
2186 | ||
2187 | entry = debugfs_create_file("set_event", 0644, parent, | |
2188 | tr, &ftrace_set_event_fops); | |
2189 | if (!entry) { | |
2190 | pr_warning("Could not create debugfs 'set_event' entry\n"); | |
2191 | return -ENOMEM; | |
2192 | } | |
2193 | ||
2194 | d_events = debugfs_create_dir("events", parent); | |
277ba044 | 2195 | if (!d_events) { |
ae63b31e | 2196 | pr_warning("Could not create debugfs 'events' directory\n"); |
277ba044 SR |
2197 | return -ENOMEM; |
2198 | } | |
ae63b31e SR |
2199 | |
2200 | /* ring buffer internal formats */ | |
2201 | trace_create_file("header_page", 0444, d_events, | |
2202 | ring_buffer_print_page_header, | |
2203 | &ftrace_show_header_fops); | |
2204 | ||
2205 | trace_create_file("header_event", 0444, d_events, | |
2206 | ring_buffer_print_entry_header, | |
2207 | &ftrace_show_header_fops); | |
2208 | ||
2209 | trace_create_file("enable", 0644, d_events, | |
2210 | tr, &ftrace_tr_enable_fops); | |
2211 | ||
2212 | tr->event_dir = d_events; | |
77248221 SR |
2213 | |
2214 | return 0; | |
2215 | } | |
2216 | ||
2217 | /** | |
2218 | * event_trace_add_tracer - add a instance of a trace_array to events | |
2219 | * @parent: The parent dentry to place the files/directories for events in | |
2220 | * @tr: The trace array associated with these events | |
2221 | * | |
2222 | * When a new instance is created, it needs to set up its events | |
2223 | * directory, as well as other files associated with events. It also | |
2224 | * creates the event hierachry in the @parent/events directory. | |
2225 | * | |
2226 | * Returns 0 on success. | |
2227 | */ | |
2228 | int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2229 | { | |
2230 | int ret; | |
2231 | ||
2232 | mutex_lock(&event_mutex); | |
2233 | ||
2234 | ret = create_event_toplevel_files(parent, tr); | |
2235 | if (ret) | |
2236 | goto out_unlock; | |
2237 | ||
277ba044 | 2238 | down_write(&trace_event_mutex); |
ae63b31e | 2239 | __trace_add_event_dirs(tr); |
277ba044 SR |
2240 | up_write(&trace_event_mutex); |
2241 | ||
77248221 | 2242 | out_unlock: |
277ba044 | 2243 | mutex_unlock(&event_mutex); |
ae63b31e | 2244 | |
77248221 SR |
2245 | return ret; |
2246 | } | |
2247 | ||
2248 | /* | |
2249 | * The top trace array already had its file descriptors created. | |
2250 | * Now the files themselves need to be created. | |
2251 | */ | |
2252 | static __init int | |
2253 | early_event_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2254 | { | |
2255 | int ret; | |
2256 | ||
2257 | mutex_lock(&event_mutex); | |
2258 | ||
2259 | ret = create_event_toplevel_files(parent, tr); | |
2260 | if (ret) | |
2261 | goto out_unlock; | |
2262 | ||
2263 | down_write(&trace_event_mutex); | |
2264 | __trace_early_add_event_dirs(tr); | |
2265 | up_write(&trace_event_mutex); | |
2266 | ||
2267 | out_unlock: | |
2268 | mutex_unlock(&event_mutex); | |
2269 | ||
2270 | return ret; | |
ae63b31e SR |
2271 | } |
2272 | ||
0c8916c3 SR |
2273 | int event_trace_del_tracer(struct trace_array *tr) |
2274 | { | |
2275 | /* Disable any running events */ | |
2276 | __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); | |
2277 | ||
2278 | mutex_lock(&event_mutex); | |
2279 | ||
2280 | down_write(&trace_event_mutex); | |
2281 | __trace_remove_event_dirs(tr); | |
2282 | debugfs_remove_recursive(tr->event_dir); | |
2283 | up_write(&trace_event_mutex); | |
2284 | ||
2285 | tr->event_dir = NULL; | |
2286 | ||
2287 | mutex_unlock(&event_mutex); | |
2288 | ||
2289 | return 0; | |
2290 | } | |
2291 | ||
d1a29143 SR |
2292 | static __init int event_trace_memsetup(void) |
2293 | { | |
2294 | field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); | |
2295 | file_cachep = KMEM_CACHE(ftrace_event_file, SLAB_PANIC); | |
2296 | return 0; | |
2297 | } | |
2298 | ||
8781915a EG |
2299 | static __init int event_trace_enable(void) |
2300 | { | |
ae63b31e | 2301 | struct trace_array *tr = top_trace_array(); |
8781915a EG |
2302 | struct ftrace_event_call **iter, *call; |
2303 | char *buf = bootup_event_buf; | |
2304 | char *token; | |
2305 | int ret; | |
2306 | ||
2307 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { | |
2308 | ||
2309 | call = *iter; | |
2310 | ret = event_init(call); | |
2311 | if (!ret) | |
2312 | list_add(&call->list, &ftrace_events); | |
2313 | } | |
2314 | ||
77248221 SR |
2315 | /* |
2316 | * We need the top trace array to have a working set of trace | |
2317 | * points at early init, before the debug files and directories | |
2318 | * are created. Create the file entries now, and attach them | |
2319 | * to the actual file dentries later. | |
2320 | */ | |
2321 | __trace_early_add_events(tr); | |
2322 | ||
8781915a EG |
2323 | while (true) { |
2324 | token = strsep(&buf, ","); | |
2325 | ||
2326 | if (!token) | |
2327 | break; | |
2328 | if (!*token) | |
2329 | continue; | |
2330 | ||
ae63b31e | 2331 | ret = ftrace_set_clr_event(tr, token, 1); |
8781915a EG |
2332 | if (ret) |
2333 | pr_warn("Failed to enable trace event: %s\n", token); | |
2334 | } | |
81698831 SR |
2335 | |
2336 | trace_printk_start_comm(); | |
2337 | ||
3cd715de SRRH |
2338 | register_event_cmds(); |
2339 | ||
8781915a EG |
2340 | return 0; |
2341 | } | |
2342 | ||
b77e38aa SR |
2343 | static __init int event_trace_init(void) |
2344 | { | |
ae63b31e | 2345 | struct trace_array *tr; |
b77e38aa SR |
2346 | struct dentry *d_tracer; |
2347 | struct dentry *entry; | |
6d723736 | 2348 | int ret; |
b77e38aa | 2349 | |
ae63b31e SR |
2350 | tr = top_trace_array(); |
2351 | ||
b77e38aa SR |
2352 | d_tracer = tracing_init_dentry(); |
2353 | if (!d_tracer) | |
2354 | return 0; | |
2355 | ||
2314c4ae | 2356 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
ae63b31e | 2357 | tr, &ftrace_avail_fops); |
2314c4ae SR |
2358 | if (!entry) |
2359 | pr_warning("Could not create debugfs " | |
2360 | "'available_events' entry\n"); | |
2361 | ||
8728fe50 LZ |
2362 | if (trace_define_common_fields()) |
2363 | pr_warning("tracing: Failed to allocate common fields"); | |
2364 | ||
77248221 | 2365 | ret = early_event_add_tracer(d_tracer, tr); |
ae63b31e SR |
2366 | if (ret) |
2367 | return ret; | |
020e5f85 | 2368 | |
6d723736 | 2369 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 2370 | if (ret) |
6d723736 SR |
2371 | pr_warning("Failed to register trace events module notifier\n"); |
2372 | ||
b77e38aa SR |
2373 | return 0; |
2374 | } | |
d1a29143 | 2375 | early_initcall(event_trace_memsetup); |
8781915a | 2376 | core_initcall(event_trace_enable); |
b77e38aa | 2377 | fs_initcall(event_trace_init); |
e6187007 SR |
2378 | |
2379 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
2380 | ||
2381 | static DEFINE_SPINLOCK(test_spinlock); | |
2382 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
2383 | static DEFINE_MUTEX(test_mutex); | |
2384 | ||
2385 | static __init void test_work(struct work_struct *dummy) | |
2386 | { | |
2387 | spin_lock(&test_spinlock); | |
2388 | spin_lock_irq(&test_spinlock_irq); | |
2389 | udelay(1); | |
2390 | spin_unlock_irq(&test_spinlock_irq); | |
2391 | spin_unlock(&test_spinlock); | |
2392 | ||
2393 | mutex_lock(&test_mutex); | |
2394 | msleep(1); | |
2395 | mutex_unlock(&test_mutex); | |
2396 | } | |
2397 | ||
2398 | static __init int event_test_thread(void *unused) | |
2399 | { | |
2400 | void *test_malloc; | |
2401 | ||
2402 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
2403 | if (!test_malloc) | |
2404 | pr_info("failed to kmalloc\n"); | |
2405 | ||
2406 | schedule_on_each_cpu(test_work); | |
2407 | ||
2408 | kfree(test_malloc); | |
2409 | ||
2410 | set_current_state(TASK_INTERRUPTIBLE); | |
2411 | while (!kthread_should_stop()) | |
2412 | schedule(); | |
2413 | ||
2414 | return 0; | |
2415 | } | |
2416 | ||
2417 | /* | |
2418 | * Do various things that may trigger events. | |
2419 | */ | |
2420 | static __init void event_test_stuff(void) | |
2421 | { | |
2422 | struct task_struct *test_thread; | |
2423 | ||
2424 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
2425 | msleep(1); | |
2426 | kthread_stop(test_thread); | |
2427 | } | |
2428 | ||
2429 | /* | |
2430 | * For every trace event defined, we will test each trace point separately, | |
2431 | * and then by groups, and finally all trace points. | |
2432 | */ | |
9ea21c1e | 2433 | static __init void event_trace_self_tests(void) |
e6187007 | 2434 | { |
ae63b31e SR |
2435 | struct ftrace_subsystem_dir *dir; |
2436 | struct ftrace_event_file *file; | |
e6187007 SR |
2437 | struct ftrace_event_call *call; |
2438 | struct event_subsystem *system; | |
ae63b31e | 2439 | struct trace_array *tr; |
e6187007 SR |
2440 | int ret; |
2441 | ||
ae63b31e SR |
2442 | tr = top_trace_array(); |
2443 | ||
e6187007 SR |
2444 | pr_info("Running tests on trace events:\n"); |
2445 | ||
ae63b31e SR |
2446 | list_for_each_entry(file, &tr->events, list) { |
2447 | ||
2448 | call = file->event_call; | |
e6187007 | 2449 | |
2239291a SR |
2450 | /* Only test those that have a probe */ |
2451 | if (!call->class || !call->class->probe) | |
e6187007 SR |
2452 | continue; |
2453 | ||
1f5a6b45 SR |
2454 | /* |
2455 | * Testing syscall events here is pretty useless, but | |
2456 | * we still do it if configured. But this is time consuming. | |
2457 | * What we really need is a user thread to perform the | |
2458 | * syscalls as we test. | |
2459 | */ | |
2460 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
2461 | if (call->class->system && |
2462 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
2463 | continue; |
2464 | #endif | |
2465 | ||
e6187007 SR |
2466 | pr_info("Testing event %s: ", call->name); |
2467 | ||
2468 | /* | |
2469 | * If an event is already enabled, someone is using | |
2470 | * it and the self test should not be on. | |
2471 | */ | |
ae63b31e | 2472 | if (file->flags & FTRACE_EVENT_FL_ENABLED) { |
e6187007 SR |
2473 | pr_warning("Enabled event during self test!\n"); |
2474 | WARN_ON_ONCE(1); | |
2475 | continue; | |
2476 | } | |
2477 | ||
ae63b31e | 2478 | ftrace_event_enable_disable(file, 1); |
e6187007 | 2479 | event_test_stuff(); |
ae63b31e | 2480 | ftrace_event_enable_disable(file, 0); |
e6187007 SR |
2481 | |
2482 | pr_cont("OK\n"); | |
2483 | } | |
2484 | ||
2485 | /* Now test at the sub system level */ | |
2486 | ||
2487 | pr_info("Running tests on trace event systems:\n"); | |
2488 | ||
ae63b31e SR |
2489 | list_for_each_entry(dir, &tr->systems, list) { |
2490 | ||
2491 | system = dir->subsystem; | |
e6187007 SR |
2492 | |
2493 | /* the ftrace system is special, skip it */ | |
2494 | if (strcmp(system->name, "ftrace") == 0) | |
2495 | continue; | |
2496 | ||
2497 | pr_info("Testing event system %s: ", system->name); | |
2498 | ||
ae63b31e | 2499 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
e6187007 SR |
2500 | if (WARN_ON_ONCE(ret)) { |
2501 | pr_warning("error enabling system %s\n", | |
2502 | system->name); | |
2503 | continue; | |
2504 | } | |
2505 | ||
2506 | event_test_stuff(); | |
2507 | ||
ae63b31e | 2508 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
76bab1b7 | 2509 | if (WARN_ON_ONCE(ret)) { |
e6187007 SR |
2510 | pr_warning("error disabling system %s\n", |
2511 | system->name); | |
76bab1b7 YL |
2512 | continue; |
2513 | } | |
e6187007 SR |
2514 | |
2515 | pr_cont("OK\n"); | |
2516 | } | |
2517 | ||
2518 | /* Test with all events enabled */ | |
2519 | ||
2520 | pr_info("Running tests on all trace events:\n"); | |
2521 | pr_info("Testing all events: "); | |
2522 | ||
ae63b31e | 2523 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
e6187007 | 2524 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 2525 | pr_warning("error enabling all events\n"); |
9ea21c1e | 2526 | return; |
e6187007 SR |
2527 | } |
2528 | ||
2529 | event_test_stuff(); | |
2530 | ||
2531 | /* reset sysname */ | |
ae63b31e | 2532 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
e6187007 SR |
2533 | if (WARN_ON_ONCE(ret)) { |
2534 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 2535 | return; |
e6187007 SR |
2536 | } |
2537 | ||
2538 | pr_cont("OK\n"); | |
9ea21c1e SR |
2539 | } |
2540 | ||
2541 | #ifdef CONFIG_FUNCTION_TRACER | |
2542 | ||
245b2e70 | 2543 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e SR |
2544 | |
2545 | static void | |
2f5f6ad9 | 2546 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 2547 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
9ea21c1e SR |
2548 | { |
2549 | struct ring_buffer_event *event; | |
e77405ad | 2550 | struct ring_buffer *buffer; |
9ea21c1e SR |
2551 | struct ftrace_entry *entry; |
2552 | unsigned long flags; | |
2553 | long disabled; | |
9ea21c1e SR |
2554 | int cpu; |
2555 | int pc; | |
2556 | ||
2557 | pc = preempt_count(); | |
5168ae50 | 2558 | preempt_disable_notrace(); |
9ea21c1e | 2559 | cpu = raw_smp_processor_id(); |
245b2e70 | 2560 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
2561 | |
2562 | if (disabled != 1) | |
2563 | goto out; | |
2564 | ||
2565 | local_save_flags(flags); | |
2566 | ||
e77405ad SR |
2567 | event = trace_current_buffer_lock_reserve(&buffer, |
2568 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
2569 | flags, pc); |
2570 | if (!event) | |
2571 | goto out; | |
2572 | entry = ring_buffer_event_data(event); | |
2573 | entry->ip = ip; | |
2574 | entry->parent_ip = parent_ip; | |
2575 | ||
0d5c6e1c | 2576 | trace_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
2577 | |
2578 | out: | |
245b2e70 | 2579 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 2580 | preempt_enable_notrace(); |
9ea21c1e SR |
2581 | } |
2582 | ||
2583 | static struct ftrace_ops trace_ops __initdata = | |
2584 | { | |
2585 | .func = function_test_events_call, | |
4740974a | 2586 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
9ea21c1e SR |
2587 | }; |
2588 | ||
2589 | static __init void event_trace_self_test_with_function(void) | |
2590 | { | |
17bb615a SR |
2591 | int ret; |
2592 | ret = register_ftrace_function(&trace_ops); | |
2593 | if (WARN_ON(ret < 0)) { | |
2594 | pr_info("Failed to enable function tracer for event tests\n"); | |
2595 | return; | |
2596 | } | |
9ea21c1e SR |
2597 | pr_info("Running tests again, along with the function tracer\n"); |
2598 | event_trace_self_tests(); | |
2599 | unregister_ftrace_function(&trace_ops); | |
2600 | } | |
2601 | #else | |
2602 | static __init void event_trace_self_test_with_function(void) | |
2603 | { | |
2604 | } | |
2605 | #endif | |
2606 | ||
2607 | static __init int event_trace_self_tests_init(void) | |
2608 | { | |
020e5f85 LZ |
2609 | if (!tracing_selftest_disabled) { |
2610 | event_trace_self_tests(); | |
2611 | event_trace_self_test_with_function(); | |
2612 | } | |
e6187007 SR |
2613 | |
2614 | return 0; | |
2615 | } | |
2616 | ||
28d20e2d | 2617 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
2618 | |
2619 | #endif |