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 | ||
3448bac3 FF |
11 | #define pr_fmt(fmt) fmt |
12 | ||
e6187007 SR |
13 | #include <linux/workqueue.h> |
14 | #include <linux/spinlock.h> | |
15 | #include <linux/kthread.h> | |
8434dc93 | 16 | #include <linux/tracefs.h> |
b77e38aa SR |
17 | #include <linux/uaccess.h> |
18 | #include <linux/module.h> | |
19 | #include <linux/ctype.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
e6187007 | 21 | #include <linux/delay.h> |
b77e38aa | 22 | |
020e5f85 LZ |
23 | #include <asm/setup.h> |
24 | ||
91729ef9 | 25 | #include "trace_output.h" |
b77e38aa | 26 | |
4e5292ea | 27 | #undef TRACE_SYSTEM |
b628b3e6 SR |
28 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
29 | ||
20c8928a | 30 | DEFINE_MUTEX(event_mutex); |
11a241a3 | 31 | |
a59fd602 | 32 | LIST_HEAD(ftrace_events); |
9f616680 | 33 | static LIST_HEAD(ftrace_generic_fields); |
b3a8c6fd | 34 | static LIST_HEAD(ftrace_common_fields); |
a59fd602 | 35 | |
d1a29143 SR |
36 | #define GFP_TRACE (GFP_KERNEL | __GFP_ZERO) |
37 | ||
38 | static struct kmem_cache *field_cachep; | |
39 | static struct kmem_cache *file_cachep; | |
40 | ||
6e94a780 SR |
41 | static inline int system_refcount(struct event_subsystem *system) |
42 | { | |
79ac6ef5 | 43 | return system->ref_count; |
6e94a780 SR |
44 | } |
45 | ||
46 | static int system_refcount_inc(struct event_subsystem *system) | |
47 | { | |
79ac6ef5 | 48 | return system->ref_count++; |
6e94a780 SR |
49 | } |
50 | ||
51 | static int system_refcount_dec(struct event_subsystem *system) | |
52 | { | |
79ac6ef5 | 53 | return --system->ref_count; |
6e94a780 SR |
54 | } |
55 | ||
ae63b31e SR |
56 | /* Double loops, do not use break, only goto's work */ |
57 | #define do_for_each_event_file(tr, file) \ | |
58 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
59 | list_for_each_entry(file, &tr->events, list) | |
60 | ||
61 | #define do_for_each_event_file_safe(tr, file) \ | |
62 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
7f1d2f82 | 63 | struct trace_event_file *___n; \ |
ae63b31e SR |
64 | list_for_each_entry_safe(file, ___n, &tr->events, list) |
65 | ||
66 | #define while_for_each_event_file() \ | |
67 | } | |
68 | ||
b3a8c6fd | 69 | static struct list_head * |
2425bcb9 | 70 | trace_get_fields(struct trace_event_call *event_call) |
2e33af02 SR |
71 | { |
72 | if (!event_call->class->get_fields) | |
73 | return &event_call->class->fields; | |
74 | return event_call->class->get_fields(event_call); | |
75 | } | |
76 | ||
b3a8c6fd J |
77 | static struct ftrace_event_field * |
78 | __find_event_field(struct list_head *head, char *name) | |
79 | { | |
80 | struct ftrace_event_field *field; | |
81 | ||
82 | list_for_each_entry(field, head, link) { | |
83 | if (!strcmp(field->name, name)) | |
84 | return field; | |
85 | } | |
86 | ||
87 | return NULL; | |
88 | } | |
89 | ||
90 | struct ftrace_event_field * | |
2425bcb9 | 91 | trace_find_event_field(struct trace_event_call *call, char *name) |
b3a8c6fd J |
92 | { |
93 | struct ftrace_event_field *field; | |
94 | struct list_head *head; | |
95 | ||
9f616680 DW |
96 | field = __find_event_field(&ftrace_generic_fields, name); |
97 | if (field) | |
98 | return field; | |
99 | ||
b3a8c6fd J |
100 | field = __find_event_field(&ftrace_common_fields, name); |
101 | if (field) | |
102 | return field; | |
103 | ||
104 | head = trace_get_fields(call); | |
105 | return __find_event_field(head, name); | |
106 | } | |
107 | ||
8728fe50 LZ |
108 | static int __trace_define_field(struct list_head *head, const char *type, |
109 | const char *name, int offset, int size, | |
110 | int is_signed, int filter_type) | |
cf027f64 TZ |
111 | { |
112 | struct ftrace_event_field *field; | |
113 | ||
d1a29143 | 114 | field = kmem_cache_alloc(field_cachep, GFP_TRACE); |
cf027f64 | 115 | if (!field) |
aaf6ac0f | 116 | return -ENOMEM; |
fe9f57f2 | 117 | |
92edca07 SR |
118 | field->name = name; |
119 | field->type = type; | |
fe9f57f2 | 120 | |
43b51ead LZ |
121 | if (filter_type == FILTER_OTHER) |
122 | field->filter_type = filter_assign_type(type); | |
123 | else | |
124 | field->filter_type = filter_type; | |
125 | ||
cf027f64 TZ |
126 | field->offset = offset; |
127 | field->size = size; | |
a118e4d1 | 128 | field->is_signed = is_signed; |
aa38e9fc | 129 | |
2e33af02 | 130 | list_add(&field->link, head); |
cf027f64 TZ |
131 | |
132 | return 0; | |
cf027f64 | 133 | } |
8728fe50 | 134 | |
2425bcb9 | 135 | int trace_define_field(struct trace_event_call *call, const char *type, |
8728fe50 LZ |
136 | const char *name, int offset, int size, int is_signed, |
137 | int filter_type) | |
138 | { | |
139 | struct list_head *head; | |
140 | ||
141 | if (WARN_ON(!call->class)) | |
142 | return 0; | |
143 | ||
144 | head = trace_get_fields(call); | |
145 | return __trace_define_field(head, type, name, offset, size, | |
146 | is_signed, filter_type); | |
147 | } | |
17c873ec | 148 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 149 | |
9f616680 DW |
150 | #define __generic_field(type, item, filter_type) \ |
151 | ret = __trace_define_field(&ftrace_generic_fields, #type, \ | |
152 | #item, 0, 0, is_signed_type(type), \ | |
153 | filter_type); \ | |
154 | if (ret) \ | |
155 | return ret; | |
156 | ||
e647d6b3 | 157 | #define __common_field(type, item) \ |
8728fe50 LZ |
158 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
159 | "common_" #item, \ | |
160 | offsetof(typeof(ent), item), \ | |
161 | sizeof(ent.item), \ | |
162 | is_signed_type(type), FILTER_OTHER); \ | |
e647d6b3 LZ |
163 | if (ret) \ |
164 | return ret; | |
165 | ||
9f616680 DW |
166 | static int trace_define_generic_fields(void) |
167 | { | |
168 | int ret; | |
169 | ||
170 | __generic_field(int, cpu, FILTER_OTHER); | |
171 | __generic_field(char *, comm, FILTER_PTR_STRING); | |
172 | ||
173 | return ret; | |
174 | } | |
175 | ||
8728fe50 | 176 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
177 | { |
178 | int ret; | |
179 | struct trace_entry ent; | |
180 | ||
181 | __common_field(unsigned short, type); | |
182 | __common_field(unsigned char, flags); | |
183 | __common_field(unsigned char, preempt_count); | |
184 | __common_field(int, pid); | |
e647d6b3 LZ |
185 | |
186 | return ret; | |
187 | } | |
188 | ||
2425bcb9 | 189 | static void trace_destroy_fields(struct trace_event_call *call) |
2df75e41 LZ |
190 | { |
191 | struct ftrace_event_field *field, *next; | |
2e33af02 | 192 | struct list_head *head; |
2df75e41 | 193 | |
2e33af02 SR |
194 | head = trace_get_fields(call); |
195 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 | 196 | list_del(&field->link); |
d1a29143 | 197 | kmem_cache_free(field_cachep, field); |
2df75e41 LZ |
198 | } |
199 | } | |
200 | ||
2425bcb9 | 201 | int trace_event_raw_init(struct trace_event_call *call) |
87d9b4e1 LZ |
202 | { |
203 | int id; | |
204 | ||
9023c930 | 205 | id = register_trace_event(&call->event); |
87d9b4e1 LZ |
206 | if (!id) |
207 | return -ENODEV; | |
87d9b4e1 LZ |
208 | |
209 | return 0; | |
210 | } | |
211 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
212 | ||
3f795dcf SRRH |
213 | void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer, |
214 | struct trace_event_file *trace_file, | |
215 | unsigned long len) | |
3fd40d1e | 216 | { |
2425bcb9 | 217 | struct trace_event_call *event_call = trace_file->event_call; |
3fd40d1e SR |
218 | |
219 | local_save_flags(fbuffer->flags); | |
220 | fbuffer->pc = preempt_count(); | |
7f1d2f82 | 221 | fbuffer->trace_file = trace_file; |
3fd40d1e SR |
222 | |
223 | fbuffer->event = | |
7f1d2f82 | 224 | trace_event_buffer_lock_reserve(&fbuffer->buffer, trace_file, |
3fd40d1e SR |
225 | event_call->event.type, len, |
226 | fbuffer->flags, fbuffer->pc); | |
227 | if (!fbuffer->event) | |
228 | return NULL; | |
229 | ||
230 | fbuffer->entry = ring_buffer_event_data(fbuffer->event); | |
231 | return fbuffer->entry; | |
232 | } | |
3f795dcf | 233 | EXPORT_SYMBOL_GPL(trace_event_buffer_reserve); |
3fd40d1e | 234 | |
0daa2302 SRRH |
235 | static DEFINE_SPINLOCK(tracepoint_iter_lock); |
236 | ||
3f795dcf | 237 | static void output_printk(struct trace_event_buffer *fbuffer) |
0daa2302 | 238 | { |
2425bcb9 | 239 | struct trace_event_call *event_call; |
0daa2302 SRRH |
240 | struct trace_event *event; |
241 | unsigned long flags; | |
242 | struct trace_iterator *iter = tracepoint_print_iter; | |
243 | ||
244 | if (!iter) | |
245 | return; | |
246 | ||
7f1d2f82 | 247 | event_call = fbuffer->trace_file->event_call; |
0daa2302 SRRH |
248 | if (!event_call || !event_call->event.funcs || |
249 | !event_call->event.funcs->trace) | |
250 | return; | |
251 | ||
7f1d2f82 | 252 | event = &fbuffer->trace_file->event_call->event; |
0daa2302 SRRH |
253 | |
254 | spin_lock_irqsave(&tracepoint_iter_lock, flags); | |
255 | trace_seq_init(&iter->seq); | |
256 | iter->ent = fbuffer->entry; | |
257 | event_call->event.funcs->trace(iter, 0, event); | |
258 | trace_seq_putc(&iter->seq, 0); | |
259 | printk("%s", iter->seq.buffer); | |
260 | ||
261 | spin_unlock_irqrestore(&tracepoint_iter_lock, flags); | |
262 | } | |
263 | ||
3f795dcf | 264 | void trace_event_buffer_commit(struct trace_event_buffer *fbuffer) |
3fd40d1e | 265 | { |
0daa2302 SRRH |
266 | if (tracepoint_printk) |
267 | output_printk(fbuffer); | |
268 | ||
7f1d2f82 | 269 | event_trigger_unlock_commit(fbuffer->trace_file, fbuffer->buffer, |
3fd40d1e SR |
270 | fbuffer->event, fbuffer->entry, |
271 | fbuffer->flags, fbuffer->pc); | |
272 | } | |
3f795dcf | 273 | EXPORT_SYMBOL_GPL(trace_event_buffer_commit); |
3fd40d1e | 274 | |
2425bcb9 | 275 | int trace_event_reg(struct trace_event_call *call, |
9023c930 | 276 | enum trace_reg type, void *data) |
a1d0ce82 | 277 | { |
7f1d2f82 | 278 | struct trace_event_file *file = data; |
ae63b31e | 279 | |
de7b2973 | 280 | WARN_ON(!(call->flags & TRACE_EVENT_FL_TRACEPOINT)); |
a1d0ce82 SR |
281 | switch (type) { |
282 | case TRACE_REG_REGISTER: | |
de7b2973 | 283 | return tracepoint_probe_register(call->tp, |
a1d0ce82 | 284 | call->class->probe, |
ae63b31e | 285 | file); |
a1d0ce82 | 286 | case TRACE_REG_UNREGISTER: |
de7b2973 | 287 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 | 288 | call->class->probe, |
ae63b31e | 289 | file); |
a1d0ce82 SR |
290 | return 0; |
291 | ||
292 | #ifdef CONFIG_PERF_EVENTS | |
293 | case TRACE_REG_PERF_REGISTER: | |
de7b2973 | 294 | return tracepoint_probe_register(call->tp, |
a1d0ce82 SR |
295 | call->class->perf_probe, |
296 | call); | |
297 | case TRACE_REG_PERF_UNREGISTER: | |
de7b2973 | 298 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 SR |
299 | call->class->perf_probe, |
300 | call); | |
301 | return 0; | |
ceec0b6f JO |
302 | case TRACE_REG_PERF_OPEN: |
303 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
304 | case TRACE_REG_PERF_ADD: |
305 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 306 | return 0; |
a1d0ce82 SR |
307 | #endif |
308 | } | |
309 | return 0; | |
310 | } | |
9023c930 | 311 | EXPORT_SYMBOL_GPL(trace_event_reg); |
a1d0ce82 | 312 | |
e870e9a1 LZ |
313 | void trace_event_enable_cmd_record(bool enable) |
314 | { | |
7f1d2f82 | 315 | struct trace_event_file *file; |
ae63b31e | 316 | struct trace_array *tr; |
e870e9a1 LZ |
317 | |
318 | mutex_lock(&event_mutex); | |
ae63b31e SR |
319 | do_for_each_event_file(tr, file) { |
320 | ||
5d6ad960 | 321 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) |
e870e9a1 LZ |
322 | continue; |
323 | ||
324 | if (enable) { | |
325 | tracing_start_cmdline_record(); | |
5d6ad960 | 326 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 LZ |
327 | } else { |
328 | tracing_stop_cmdline_record(); | |
5d6ad960 | 329 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 330 | } |
ae63b31e | 331 | } while_for_each_event_file(); |
e870e9a1 LZ |
332 | mutex_unlock(&event_mutex); |
333 | } | |
334 | ||
7f1d2f82 | 335 | static int __ftrace_event_enable_disable(struct trace_event_file *file, |
417944c4 | 336 | int enable, int soft_disable) |
fd994989 | 337 | { |
2425bcb9 | 338 | struct trace_event_call *call = file->event_call; |
983f938a | 339 | struct trace_array *tr = file->tr; |
3b8e4273 | 340 | int ret = 0; |
417944c4 | 341 | int disable; |
3b8e4273 | 342 | |
fd994989 SR |
343 | switch (enable) { |
344 | case 0: | |
417944c4 | 345 | /* |
1cf4c073 MH |
346 | * When soft_disable is set and enable is cleared, the sm_ref |
347 | * reference counter is decremented. If it reaches 0, we want | |
417944c4 SRRH |
348 | * to clear the SOFT_DISABLED flag but leave the event in the |
349 | * state that it was. That is, if the event was enabled and | |
350 | * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED | |
351 | * is set we do not want the event to be enabled before we | |
352 | * clear the bit. | |
353 | * | |
354 | * When soft_disable is not set but the SOFT_MODE flag is, | |
355 | * we do nothing. Do not disable the tracepoint, otherwise | |
356 | * "soft enable"s (clearing the SOFT_DISABLED bit) wont work. | |
357 | */ | |
358 | if (soft_disable) { | |
1cf4c073 MH |
359 | if (atomic_dec_return(&file->sm_ref) > 0) |
360 | break; | |
5d6ad960 SRRH |
361 | disable = file->flags & EVENT_FILE_FL_SOFT_DISABLED; |
362 | clear_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); | |
417944c4 | 363 | } else |
5d6ad960 | 364 | disable = !(file->flags & EVENT_FILE_FL_SOFT_MODE); |
417944c4 | 365 | |
5d6ad960 SRRH |
366 | if (disable && (file->flags & EVENT_FILE_FL_ENABLED)) { |
367 | clear_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); | |
368 | if (file->flags & EVENT_FILE_FL_RECORDED_CMD) { | |
e870e9a1 | 369 | tracing_stop_cmdline_record(); |
5d6ad960 | 370 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 371 | } |
ae63b31e | 372 | call->class->reg(call, TRACE_REG_UNREGISTER, file); |
fd994989 | 373 | } |
3baa5e4c | 374 | /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT, else clear it */ |
5d6ad960 SRRH |
375 | if (file->flags & EVENT_FILE_FL_SOFT_MODE) |
376 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); | |
3baa5e4c | 377 | else |
5d6ad960 | 378 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
fd994989 SR |
379 | break; |
380 | case 1: | |
417944c4 SRRH |
381 | /* |
382 | * When soft_disable is set and enable is set, we want to | |
383 | * register the tracepoint for the event, but leave the event | |
384 | * as is. That means, if the event was already enabled, we do | |
385 | * nothing (but set SOFT_MODE). If the event is disabled, we | |
386 | * set SOFT_DISABLED before enabling the event tracepoint, so | |
387 | * it still seems to be disabled. | |
388 | */ | |
389 | if (!soft_disable) | |
5d6ad960 | 390 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
1cf4c073 MH |
391 | else { |
392 | if (atomic_inc_return(&file->sm_ref) > 1) | |
393 | break; | |
5d6ad960 | 394 | set_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); |
1cf4c073 | 395 | } |
417944c4 | 396 | |
5d6ad960 | 397 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) { |
417944c4 SRRH |
398 | |
399 | /* Keep the event disabled, when going to SOFT_MODE. */ | |
400 | if (soft_disable) | |
5d6ad960 | 401 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
417944c4 | 402 | |
983f938a | 403 | if (tr->trace_flags & TRACE_ITER_RECORD_CMD) { |
e870e9a1 | 404 | tracing_start_cmdline_record(); |
5d6ad960 | 405 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 406 | } |
ae63b31e | 407 | ret = call->class->reg(call, TRACE_REG_REGISTER, file); |
3b8e4273 LZ |
408 | if (ret) { |
409 | tracing_stop_cmdline_record(); | |
410 | pr_info("event trace: Could not enable event " | |
687fcc4a | 411 | "%s\n", trace_event_name(call)); |
3b8e4273 LZ |
412 | break; |
413 | } | |
5d6ad960 | 414 | set_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); |
575380da SRRH |
415 | |
416 | /* WAS_ENABLED gets set but never cleared. */ | |
417 | call->flags |= TRACE_EVENT_FL_WAS_ENABLED; | |
fd994989 | 418 | } |
fd994989 SR |
419 | break; |
420 | } | |
3b8e4273 LZ |
421 | |
422 | return ret; | |
fd994989 SR |
423 | } |
424 | ||
7f1d2f82 | 425 | int trace_event_enable_disable(struct trace_event_file *file, |
85f2b082 TZ |
426 | int enable, int soft_disable) |
427 | { | |
428 | return __ftrace_event_enable_disable(file, enable, soft_disable); | |
429 | } | |
430 | ||
7f1d2f82 | 431 | static int ftrace_event_enable_disable(struct trace_event_file *file, |
417944c4 SRRH |
432 | int enable) |
433 | { | |
434 | return __ftrace_event_enable_disable(file, enable, 0); | |
435 | } | |
436 | ||
ae63b31e | 437 | static void ftrace_clear_events(struct trace_array *tr) |
0e907c99 | 438 | { |
7f1d2f82 | 439 | struct trace_event_file *file; |
0e907c99 Z |
440 | |
441 | mutex_lock(&event_mutex); | |
ae63b31e SR |
442 | list_for_each_entry(file, &tr->events, list) { |
443 | ftrace_event_enable_disable(file, 0); | |
0e907c99 Z |
444 | } |
445 | mutex_unlock(&event_mutex); | |
446 | } | |
447 | ||
e9dbfae5 SR |
448 | static void __put_system(struct event_subsystem *system) |
449 | { | |
450 | struct event_filter *filter = system->filter; | |
451 | ||
6e94a780 SR |
452 | WARN_ON_ONCE(system_refcount(system) == 0); |
453 | if (system_refcount_dec(system)) | |
e9dbfae5 SR |
454 | return; |
455 | ||
ae63b31e SR |
456 | list_del(&system->list); |
457 | ||
e9dbfae5 SR |
458 | if (filter) { |
459 | kfree(filter->filter_string); | |
460 | kfree(filter); | |
461 | } | |
79ac6ef5 | 462 | kfree_const(system->name); |
e9dbfae5 SR |
463 | kfree(system); |
464 | } | |
465 | ||
466 | static void __get_system(struct event_subsystem *system) | |
467 | { | |
6e94a780 SR |
468 | WARN_ON_ONCE(system_refcount(system) == 0); |
469 | system_refcount_inc(system); | |
e9dbfae5 SR |
470 | } |
471 | ||
7967b3e0 | 472 | static void __get_system_dir(struct trace_subsystem_dir *dir) |
ae63b31e SR |
473 | { |
474 | WARN_ON_ONCE(dir->ref_count == 0); | |
475 | dir->ref_count++; | |
476 | __get_system(dir->subsystem); | |
477 | } | |
478 | ||
7967b3e0 | 479 | static void __put_system_dir(struct trace_subsystem_dir *dir) |
ae63b31e SR |
480 | { |
481 | WARN_ON_ONCE(dir->ref_count == 0); | |
482 | /* If the subsystem is about to be freed, the dir must be too */ | |
6e94a780 | 483 | WARN_ON_ONCE(system_refcount(dir->subsystem) == 1 && dir->ref_count != 1); |
ae63b31e SR |
484 | |
485 | __put_system(dir->subsystem); | |
486 | if (!--dir->ref_count) | |
487 | kfree(dir); | |
488 | } | |
489 | ||
7967b3e0 | 490 | static void put_system(struct trace_subsystem_dir *dir) |
e9dbfae5 SR |
491 | { |
492 | mutex_lock(&event_mutex); | |
ae63b31e | 493 | __put_system_dir(dir); |
e9dbfae5 SR |
494 | mutex_unlock(&event_mutex); |
495 | } | |
496 | ||
7967b3e0 | 497 | static void remove_subsystem(struct trace_subsystem_dir *dir) |
f6a84bdc ON |
498 | { |
499 | if (!dir) | |
500 | return; | |
501 | ||
502 | if (!--dir->nr_events) { | |
8434dc93 | 503 | tracefs_remove_recursive(dir->entry); |
f6a84bdc ON |
504 | list_del(&dir->list); |
505 | __put_system_dir(dir); | |
506 | } | |
507 | } | |
508 | ||
7f1d2f82 | 509 | static void remove_event_file_dir(struct trace_event_file *file) |
f6a84bdc | 510 | { |
bf682c31 ON |
511 | struct dentry *dir = file->dir; |
512 | struct dentry *child; | |
513 | ||
514 | if (dir) { | |
515 | spin_lock(&dir->d_lock); /* probably unneeded */ | |
946e51f2 | 516 | list_for_each_entry(child, &dir->d_subdirs, d_child) { |
7682c918 DH |
517 | if (d_really_is_positive(child)) /* probably unneeded */ |
518 | d_inode(child)->i_private = NULL; | |
bf682c31 ON |
519 | } |
520 | spin_unlock(&dir->d_lock); | |
521 | ||
8434dc93 | 522 | tracefs_remove_recursive(dir); |
bf682c31 ON |
523 | } |
524 | ||
f6a84bdc | 525 | list_del(&file->list); |
f6a84bdc | 526 | remove_subsystem(file->system); |
2448e349 | 527 | free_event_filter(file->filter); |
f6a84bdc ON |
528 | kmem_cache_free(file_cachep, file); |
529 | } | |
530 | ||
8f31bfe5 LZ |
531 | /* |
532 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
533 | */ | |
2a6c24af SRRH |
534 | static int |
535 | __ftrace_set_clr_event_nolock(struct trace_array *tr, const char *match, | |
536 | const char *sub, const char *event, int set) | |
b77e38aa | 537 | { |
7f1d2f82 | 538 | struct trace_event_file *file; |
2425bcb9 | 539 | struct trace_event_call *call; |
de7b2973 | 540 | const char *name; |
29f93943 | 541 | int ret = -EINVAL; |
8f31bfe5 | 542 | |
ae63b31e SR |
543 | list_for_each_entry(file, &tr->events, list) { |
544 | ||
545 | call = file->event_call; | |
687fcc4a | 546 | name = trace_event_name(call); |
8f31bfe5 | 547 | |
de7b2973 | 548 | if (!name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
549 | continue; |
550 | ||
9b63776f SR |
551 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
552 | continue; | |
553 | ||
8f31bfe5 | 554 | if (match && |
de7b2973 | 555 | strcmp(match, name) != 0 && |
8f082018 | 556 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
557 | continue; |
558 | ||
8f082018 | 559 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
560 | continue; |
561 | ||
de7b2973 | 562 | if (event && strcmp(event, name) != 0) |
8f31bfe5 LZ |
563 | continue; |
564 | ||
ae63b31e | 565 | ftrace_event_enable_disable(file, set); |
8f31bfe5 LZ |
566 | |
567 | ret = 0; | |
568 | } | |
2a6c24af SRRH |
569 | |
570 | return ret; | |
571 | } | |
572 | ||
573 | static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, | |
574 | const char *sub, const char *event, int set) | |
575 | { | |
576 | int ret; | |
577 | ||
578 | mutex_lock(&event_mutex); | |
579 | ret = __ftrace_set_clr_event_nolock(tr, match, sub, event, set); | |
8f31bfe5 LZ |
580 | mutex_unlock(&event_mutex); |
581 | ||
582 | return ret; | |
583 | } | |
584 | ||
ae63b31e | 585 | static int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set) |
8f31bfe5 | 586 | { |
b628b3e6 | 587 | char *event = NULL, *sub = NULL, *match; |
84fce9db | 588 | int ret; |
b628b3e6 SR |
589 | |
590 | /* | |
591 | * The buf format can be <subsystem>:<event-name> | |
592 | * *:<event-name> means any event by that name. | |
593 | * :<event-name> is the same. | |
594 | * | |
595 | * <subsystem>:* means all events in that subsystem | |
596 | * <subsystem>: means the same. | |
597 | * | |
598 | * <name> (no ':') means all events in a subsystem with | |
599 | * the name <name> or any event that matches <name> | |
600 | */ | |
601 | ||
602 | match = strsep(&buf, ":"); | |
603 | if (buf) { | |
604 | sub = match; | |
605 | event = buf; | |
606 | match = NULL; | |
607 | ||
608 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
609 | sub = NULL; | |
610 | if (!strlen(event) || strcmp(event, "*") == 0) | |
611 | event = NULL; | |
612 | } | |
b77e38aa | 613 | |
84fce9db JK |
614 | ret = __ftrace_set_clr_event(tr, match, sub, event, set); |
615 | ||
616 | /* Put back the colon to allow this to be called again */ | |
617 | if (buf) | |
618 | *(buf - 1) = ':'; | |
619 | ||
620 | return ret; | |
b77e38aa SR |
621 | } |
622 | ||
4671c794 SR |
623 | /** |
624 | * trace_set_clr_event - enable or disable an event | |
625 | * @system: system name to match (NULL for any system) | |
626 | * @event: event name to match (NULL for all events, within system) | |
627 | * @set: 1 to enable, 0 to disable | |
628 | * | |
629 | * This is a way for other parts of the kernel to enable or disable | |
630 | * event recording. | |
631 | * | |
632 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
633 | * registered events. | |
634 | */ | |
635 | int trace_set_clr_event(const char *system, const char *event, int set) | |
636 | { | |
ae63b31e SR |
637 | struct trace_array *tr = top_trace_array(); |
638 | ||
dc81e5e3 YY |
639 | if (!tr) |
640 | return -ENODEV; | |
641 | ||
ae63b31e | 642 | return __ftrace_set_clr_event(tr, NULL, system, event, set); |
4671c794 | 643 | } |
56355b83 | 644 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 645 | |
b77e38aa SR |
646 | /* 128 should be much more than enough */ |
647 | #define EVENT_BUF_SIZE 127 | |
648 | ||
649 | static ssize_t | |
650 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
651 | size_t cnt, loff_t *ppos) | |
652 | { | |
48966364 | 653 | struct trace_parser parser; |
ae63b31e SR |
654 | struct seq_file *m = file->private_data; |
655 | struct trace_array *tr = m->private; | |
4ba7978e | 656 | ssize_t read, ret; |
b77e38aa | 657 | |
4ba7978e | 658 | if (!cnt) |
b77e38aa SR |
659 | return 0; |
660 | ||
1852fcce SR |
661 | ret = tracing_update_buffers(); |
662 | if (ret < 0) | |
663 | return ret; | |
664 | ||
48966364 | 665 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
666 | return -ENOMEM; |
667 | ||
48966364 | 668 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
669 | ||
4ba7978e | 670 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 671 | int set = 1; |
b77e38aa | 672 | |
48966364 | 673 | if (*parser.buffer == '!') |
b77e38aa | 674 | set = 0; |
b77e38aa | 675 | |
48966364 | 676 | parser.buffer[parser.idx] = 0; |
677 | ||
ae63b31e | 678 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
b77e38aa | 679 | if (ret) |
48966364 | 680 | goto out_put; |
b77e38aa | 681 | } |
b77e38aa SR |
682 | |
683 | ret = read; | |
684 | ||
48966364 | 685 | out_put: |
686 | trace_parser_put(&parser); | |
b77e38aa SR |
687 | |
688 | return ret; | |
689 | } | |
690 | ||
691 | static void * | |
692 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
693 | { | |
7f1d2f82 | 694 | struct trace_event_file *file = v; |
2425bcb9 | 695 | struct trace_event_call *call; |
ae63b31e | 696 | struct trace_array *tr = m->private; |
b77e38aa SR |
697 | |
698 | (*pos)++; | |
699 | ||
ae63b31e SR |
700 | list_for_each_entry_continue(file, &tr->events, list) { |
701 | call = file->event_call; | |
40e26815 SR |
702 | /* |
703 | * The ftrace subsystem is for showing formats only. | |
704 | * They can not be enabled or disabled via the event files. | |
705 | */ | |
a1d0ce82 | 706 | if (call->class && call->class->reg) |
ae63b31e | 707 | return file; |
40e26815 | 708 | } |
b77e38aa | 709 | |
30bd39cd | 710 | return NULL; |
b77e38aa SR |
711 | } |
712 | ||
713 | static void *t_start(struct seq_file *m, loff_t *pos) | |
714 | { | |
7f1d2f82 | 715 | struct trace_event_file *file; |
ae63b31e | 716 | struct trace_array *tr = m->private; |
e1c7e2a6 LZ |
717 | loff_t l; |
718 | ||
20c8928a | 719 | mutex_lock(&event_mutex); |
e1c7e2a6 | 720 | |
7f1d2f82 | 721 | file = list_entry(&tr->events, struct trace_event_file, list); |
e1c7e2a6 | 722 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
723 | file = t_next(m, file, &l); |
724 | if (!file) | |
e1c7e2a6 LZ |
725 | break; |
726 | } | |
ae63b31e | 727 | return file; |
b77e38aa SR |
728 | } |
729 | ||
730 | static void * | |
731 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
732 | { | |
7f1d2f82 | 733 | struct trace_event_file *file = v; |
ae63b31e | 734 | struct trace_array *tr = m->private; |
b77e38aa SR |
735 | |
736 | (*pos)++; | |
737 | ||
ae63b31e | 738 | list_for_each_entry_continue(file, &tr->events, list) { |
5d6ad960 | 739 | if (file->flags & EVENT_FILE_FL_ENABLED) |
ae63b31e | 740 | return file; |
b77e38aa SR |
741 | } |
742 | ||
30bd39cd | 743 | return NULL; |
b77e38aa SR |
744 | } |
745 | ||
746 | static void *s_start(struct seq_file *m, loff_t *pos) | |
747 | { | |
7f1d2f82 | 748 | struct trace_event_file *file; |
ae63b31e | 749 | struct trace_array *tr = m->private; |
e1c7e2a6 LZ |
750 | loff_t l; |
751 | ||
20c8928a | 752 | mutex_lock(&event_mutex); |
e1c7e2a6 | 753 | |
7f1d2f82 | 754 | file = list_entry(&tr->events, struct trace_event_file, list); |
e1c7e2a6 | 755 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
756 | file = s_next(m, file, &l); |
757 | if (!file) | |
e1c7e2a6 LZ |
758 | break; |
759 | } | |
ae63b31e | 760 | return file; |
b77e38aa SR |
761 | } |
762 | ||
763 | static int t_show(struct seq_file *m, void *v) | |
764 | { | |
7f1d2f82 | 765 | struct trace_event_file *file = v; |
2425bcb9 | 766 | struct trace_event_call *call = file->event_call; |
b77e38aa | 767 | |
8f082018 SR |
768 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
769 | seq_printf(m, "%s:", call->class->system); | |
687fcc4a | 770 | seq_printf(m, "%s\n", trace_event_name(call)); |
b77e38aa SR |
771 | |
772 | return 0; | |
773 | } | |
774 | ||
775 | static void t_stop(struct seq_file *m, void *p) | |
776 | { | |
20c8928a | 777 | mutex_unlock(&event_mutex); |
b77e38aa SR |
778 | } |
779 | ||
1473e441 SR |
780 | static ssize_t |
781 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
782 | loff_t *ppos) | |
783 | { | |
7f1d2f82 | 784 | struct trace_event_file *file; |
bc6f6b08 | 785 | unsigned long flags; |
a4390596 TZ |
786 | char buf[4] = "0"; |
787 | ||
bc6f6b08 ON |
788 | mutex_lock(&event_mutex); |
789 | file = event_file_data(filp); | |
790 | if (likely(file)) | |
791 | flags = file->flags; | |
792 | mutex_unlock(&event_mutex); | |
793 | ||
794 | if (!file) | |
795 | return -ENODEV; | |
796 | ||
5d6ad960 SRRH |
797 | if (flags & EVENT_FILE_FL_ENABLED && |
798 | !(flags & EVENT_FILE_FL_SOFT_DISABLED)) | |
a4390596 TZ |
799 | strcpy(buf, "1"); |
800 | ||
5d6ad960 SRRH |
801 | if (flags & EVENT_FILE_FL_SOFT_DISABLED || |
802 | flags & EVENT_FILE_FL_SOFT_MODE) | |
a4390596 TZ |
803 | strcat(buf, "*"); |
804 | ||
805 | strcat(buf, "\n"); | |
1473e441 | 806 | |
417944c4 | 807 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf)); |
1473e441 SR |
808 | } |
809 | ||
810 | static ssize_t | |
811 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
812 | loff_t *ppos) | |
813 | { | |
7f1d2f82 | 814 | struct trace_event_file *file; |
1473e441 SR |
815 | unsigned long val; |
816 | int ret; | |
817 | ||
22fe9b54 PH |
818 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
819 | if (ret) | |
1473e441 SR |
820 | return ret; |
821 | ||
1852fcce SR |
822 | ret = tracing_update_buffers(); |
823 | if (ret < 0) | |
824 | return ret; | |
825 | ||
1473e441 SR |
826 | switch (val) { |
827 | case 0: | |
1473e441 | 828 | case 1: |
bc6f6b08 | 829 | ret = -ENODEV; |
11a241a3 | 830 | mutex_lock(&event_mutex); |
bc6f6b08 ON |
831 | file = event_file_data(filp); |
832 | if (likely(file)) | |
833 | ret = ftrace_event_enable_disable(file, val); | |
11a241a3 | 834 | mutex_unlock(&event_mutex); |
1473e441 SR |
835 | break; |
836 | ||
837 | default: | |
838 | return -EINVAL; | |
839 | } | |
840 | ||
841 | *ppos += cnt; | |
842 | ||
3b8e4273 | 843 | return ret ? ret : cnt; |
1473e441 SR |
844 | } |
845 | ||
8ae79a13 SR |
846 | static ssize_t |
847 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
848 | loff_t *ppos) | |
849 | { | |
c142b15d | 850 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
7967b3e0 | 851 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 852 | struct event_subsystem *system = dir->subsystem; |
2425bcb9 | 853 | struct trace_event_call *call; |
7f1d2f82 | 854 | struct trace_event_file *file; |
ae63b31e | 855 | struct trace_array *tr = dir->tr; |
8ae79a13 | 856 | char buf[2]; |
c142b15d | 857 | int set = 0; |
8ae79a13 SR |
858 | int ret; |
859 | ||
8ae79a13 | 860 | mutex_lock(&event_mutex); |
ae63b31e SR |
861 | list_for_each_entry(file, &tr->events, list) { |
862 | call = file->event_call; | |
687fcc4a | 863 | if (!trace_event_name(call) || !call->class || !call->class->reg) |
8ae79a13 SR |
864 | continue; |
865 | ||
40ee4dff | 866 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
867 | continue; |
868 | ||
869 | /* | |
870 | * We need to find out if all the events are set | |
871 | * or if all events or cleared, or if we have | |
872 | * a mixture. | |
873 | */ | |
5d6ad960 | 874 | set |= (1 << !!(file->flags & EVENT_FILE_FL_ENABLED)); |
c142b15d | 875 | |
8ae79a13 SR |
876 | /* |
877 | * If we have a mixture, no need to look further. | |
878 | */ | |
c142b15d | 879 | if (set == 3) |
8ae79a13 SR |
880 | break; |
881 | } | |
882 | mutex_unlock(&event_mutex); | |
883 | ||
c142b15d | 884 | buf[0] = set_to_char[set]; |
8ae79a13 | 885 | buf[1] = '\n'; |
8ae79a13 SR |
886 | |
887 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
888 | ||
889 | return ret; | |
890 | } | |
891 | ||
892 | static ssize_t | |
893 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
894 | loff_t *ppos) | |
895 | { | |
7967b3e0 | 896 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 897 | struct event_subsystem *system = dir->subsystem; |
40ee4dff | 898 | const char *name = NULL; |
8ae79a13 | 899 | unsigned long val; |
8ae79a13 SR |
900 | ssize_t ret; |
901 | ||
22fe9b54 PH |
902 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
903 | if (ret) | |
8ae79a13 SR |
904 | return ret; |
905 | ||
906 | ret = tracing_update_buffers(); | |
907 | if (ret < 0) | |
908 | return ret; | |
909 | ||
8f31bfe5 | 910 | if (val != 0 && val != 1) |
8ae79a13 | 911 | return -EINVAL; |
8ae79a13 | 912 | |
40ee4dff SR |
913 | /* |
914 | * Opening of "enable" adds a ref count to system, | |
915 | * so the name is safe to use. | |
916 | */ | |
917 | if (system) | |
918 | name = system->name; | |
919 | ||
ae63b31e | 920 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
8ae79a13 | 921 | if (ret) |
8f31bfe5 | 922 | goto out; |
8ae79a13 SR |
923 | |
924 | ret = cnt; | |
925 | ||
8f31bfe5 | 926 | out: |
8ae79a13 SR |
927 | *ppos += cnt; |
928 | ||
929 | return ret; | |
930 | } | |
931 | ||
2a37a3df SR |
932 | enum { |
933 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
934 | FORMAT_FIELD_SEPERATOR = 2, |
935 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
936 | }; |
937 | ||
938 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 939 | { |
2425bcb9 | 940 | struct trace_event_call *call = event_file_data(m->private); |
86397dc3 LZ |
941 | struct list_head *common_head = &ftrace_common_fields; |
942 | struct list_head *head = trace_get_fields(call); | |
7710b639 | 943 | struct list_head *node = v; |
981d081e | 944 | |
2a37a3df | 945 | (*pos)++; |
5a65e956 | 946 | |
2a37a3df SR |
947 | switch ((unsigned long)v) { |
948 | case FORMAT_HEADER: | |
7710b639 ON |
949 | node = common_head; |
950 | break; | |
5a65e956 | 951 | |
86397dc3 | 952 | case FORMAT_FIELD_SEPERATOR: |
7710b639 ON |
953 | node = head; |
954 | break; | |
5a65e956 | 955 | |
2a37a3df SR |
956 | case FORMAT_PRINTFMT: |
957 | /* all done */ | |
958 | return NULL; | |
5a65e956 LJ |
959 | } |
960 | ||
7710b639 ON |
961 | node = node->prev; |
962 | if (node == common_head) | |
86397dc3 | 963 | return (void *)FORMAT_FIELD_SEPERATOR; |
7710b639 | 964 | else if (node == head) |
2a37a3df | 965 | return (void *)FORMAT_PRINTFMT; |
7710b639 ON |
966 | else |
967 | return node; | |
2a37a3df SR |
968 | } |
969 | ||
970 | static int f_show(struct seq_file *m, void *v) | |
971 | { | |
2425bcb9 | 972 | struct trace_event_call *call = event_file_data(m->private); |
2a37a3df SR |
973 | struct ftrace_event_field *field; |
974 | const char *array_descriptor; | |
975 | ||
976 | switch ((unsigned long)v) { | |
977 | case FORMAT_HEADER: | |
687fcc4a | 978 | seq_printf(m, "name: %s\n", trace_event_name(call)); |
2a37a3df | 979 | seq_printf(m, "ID: %d\n", call->event.type); |
fa6f0cc7 | 980 | seq_puts(m, "format:\n"); |
8728fe50 | 981 | return 0; |
5a65e956 | 982 | |
86397dc3 LZ |
983 | case FORMAT_FIELD_SEPERATOR: |
984 | seq_putc(m, '\n'); | |
985 | return 0; | |
986 | ||
2a37a3df SR |
987 | case FORMAT_PRINTFMT: |
988 | seq_printf(m, "\nprint fmt: %s\n", | |
989 | call->print_fmt); | |
990 | return 0; | |
981d081e | 991 | } |
8728fe50 | 992 | |
7710b639 | 993 | field = list_entry(v, struct ftrace_event_field, link); |
2a37a3df SR |
994 | /* |
995 | * Smartly shows the array type(except dynamic array). | |
996 | * Normal: | |
997 | * field:TYPE VAR | |
998 | * If TYPE := TYPE[LEN], it is shown: | |
999 | * field:TYPE VAR[LEN] | |
1000 | */ | |
1001 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 1002 | |
2a37a3df SR |
1003 | if (!strncmp(field->type, "__data_loc", 10)) |
1004 | array_descriptor = NULL; | |
8728fe50 | 1005 | |
2a37a3df SR |
1006 | if (!array_descriptor) |
1007 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
1008 | field->type, field->name, field->offset, | |
1009 | field->size, !!field->is_signed); | |
1010 | else | |
1011 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
1012 | (int)(array_descriptor - field->type), | |
1013 | field->type, field->name, | |
1014 | array_descriptor, field->offset, | |
1015 | field->size, !!field->is_signed); | |
8728fe50 | 1016 | |
2a37a3df SR |
1017 | return 0; |
1018 | } | |
5a65e956 | 1019 | |
7710b639 ON |
1020 | static void *f_start(struct seq_file *m, loff_t *pos) |
1021 | { | |
1022 | void *p = (void *)FORMAT_HEADER; | |
1023 | loff_t l = 0; | |
1024 | ||
c5a44a12 ON |
1025 | /* ->stop() is called even if ->start() fails */ |
1026 | mutex_lock(&event_mutex); | |
1027 | if (!event_file_data(m->private)) | |
1028 | return ERR_PTR(-ENODEV); | |
1029 | ||
7710b639 ON |
1030 | while (l < *pos && p) |
1031 | p = f_next(m, p, &l); | |
1032 | ||
1033 | return p; | |
1034 | } | |
1035 | ||
2a37a3df SR |
1036 | static void f_stop(struct seq_file *m, void *p) |
1037 | { | |
c5a44a12 | 1038 | mutex_unlock(&event_mutex); |
2a37a3df | 1039 | } |
981d081e | 1040 | |
2a37a3df SR |
1041 | static const struct seq_operations trace_format_seq_ops = { |
1042 | .start = f_start, | |
1043 | .next = f_next, | |
1044 | .stop = f_stop, | |
1045 | .show = f_show, | |
1046 | }; | |
1047 | ||
1048 | static int trace_format_open(struct inode *inode, struct file *file) | |
1049 | { | |
2a37a3df SR |
1050 | struct seq_file *m; |
1051 | int ret; | |
1052 | ||
1053 | ret = seq_open(file, &trace_format_seq_ops); | |
1054 | if (ret < 0) | |
1055 | return ret; | |
1056 | ||
1057 | m = file->private_data; | |
c5a44a12 | 1058 | m->private = file; |
2a37a3df SR |
1059 | |
1060 | return 0; | |
981d081e SR |
1061 | } |
1062 | ||
23725aee PZ |
1063 | static ssize_t |
1064 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1065 | { | |
1a11126b | 1066 | int id = (long)event_file_data(filp); |
cd458ba9 ON |
1067 | char buf[32]; |
1068 | int len; | |
23725aee PZ |
1069 | |
1070 | if (*ppos) | |
1071 | return 0; | |
1072 | ||
1a11126b ON |
1073 | if (unlikely(!id)) |
1074 | return -ENODEV; | |
1075 | ||
1076 | len = sprintf(buf, "%d\n", id); | |
1077 | ||
cd458ba9 | 1078 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); |
23725aee PZ |
1079 | } |
1080 | ||
7ce7e424 TZ |
1081 | static ssize_t |
1082 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1083 | loff_t *ppos) | |
1084 | { | |
7f1d2f82 | 1085 | struct trace_event_file *file; |
7ce7e424 | 1086 | struct trace_seq *s; |
e2912b09 | 1087 | int r = -ENODEV; |
7ce7e424 TZ |
1088 | |
1089 | if (*ppos) | |
1090 | return 0; | |
1091 | ||
1092 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
e2912b09 | 1093 | |
7ce7e424 TZ |
1094 | if (!s) |
1095 | return -ENOMEM; | |
1096 | ||
1097 | trace_seq_init(s); | |
1098 | ||
e2912b09 | 1099 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1100 | file = event_file_data(filp); |
1101 | if (file) | |
1102 | print_event_filter(file, s); | |
e2912b09 ON |
1103 | mutex_unlock(&event_mutex); |
1104 | ||
f306cc82 | 1105 | if (file) |
5ac48378 SRRH |
1106 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1107 | s->buffer, trace_seq_used(s)); | |
7ce7e424 TZ |
1108 | |
1109 | kfree(s); | |
1110 | ||
1111 | return r; | |
1112 | } | |
1113 | ||
1114 | static ssize_t | |
1115 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1116 | loff_t *ppos) | |
1117 | { | |
7f1d2f82 | 1118 | struct trace_event_file *file; |
8b372562 | 1119 | char *buf; |
e2912b09 | 1120 | int err = -ENODEV; |
7ce7e424 | 1121 | |
8b372562 | 1122 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
1123 | return -EINVAL; |
1124 | ||
8b372562 TZ |
1125 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
1126 | if (!buf) | |
7ce7e424 TZ |
1127 | return -ENOMEM; |
1128 | ||
8b372562 TZ |
1129 | if (copy_from_user(buf, ubuf, cnt)) { |
1130 | free_page((unsigned long) buf); | |
1131 | return -EFAULT; | |
7ce7e424 | 1132 | } |
8b372562 | 1133 | buf[cnt] = '\0'; |
7ce7e424 | 1134 | |
e2912b09 | 1135 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1136 | file = event_file_data(filp); |
1137 | if (file) | |
1138 | err = apply_event_filter(file, buf); | |
e2912b09 ON |
1139 | mutex_unlock(&event_mutex); |
1140 | ||
8b372562 TZ |
1141 | free_page((unsigned long) buf); |
1142 | if (err < 0) | |
44e9c8b7 | 1143 | return err; |
0a19e53c | 1144 | |
7ce7e424 TZ |
1145 | *ppos += cnt; |
1146 | ||
1147 | return cnt; | |
1148 | } | |
1149 | ||
e9dbfae5 SR |
1150 | static LIST_HEAD(event_subsystems); |
1151 | ||
1152 | static int subsystem_open(struct inode *inode, struct file *filp) | |
1153 | { | |
1154 | struct event_subsystem *system = NULL; | |
7967b3e0 | 1155 | struct trace_subsystem_dir *dir = NULL; /* Initialize for gcc */ |
ae63b31e | 1156 | struct trace_array *tr; |
e9dbfae5 SR |
1157 | int ret; |
1158 | ||
d6d3523c GB |
1159 | if (tracing_is_disabled()) |
1160 | return -ENODEV; | |
1161 | ||
e9dbfae5 | 1162 | /* Make sure the system still exists */ |
a8227415 | 1163 | mutex_lock(&trace_types_lock); |
e9dbfae5 | 1164 | mutex_lock(&event_mutex); |
ae63b31e SR |
1165 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
1166 | list_for_each_entry(dir, &tr->systems, list) { | |
1167 | if (dir == inode->i_private) { | |
1168 | /* Don't open systems with no events */ | |
1169 | if (dir->nr_events) { | |
1170 | __get_system_dir(dir); | |
1171 | system = dir->subsystem; | |
1172 | } | |
1173 | goto exit_loop; | |
e9dbfae5 | 1174 | } |
e9dbfae5 SR |
1175 | } |
1176 | } | |
ae63b31e | 1177 | exit_loop: |
e9dbfae5 | 1178 | mutex_unlock(&event_mutex); |
a8227415 | 1179 | mutex_unlock(&trace_types_lock); |
e9dbfae5 | 1180 | |
ae63b31e | 1181 | if (!system) |
e9dbfae5 SR |
1182 | return -ENODEV; |
1183 | ||
ae63b31e SR |
1184 | /* Some versions of gcc think dir can be uninitialized here */ |
1185 | WARN_ON(!dir); | |
1186 | ||
8e2e2fa4 SRRH |
1187 | /* Still need to increment the ref count of the system */ |
1188 | if (trace_array_get(tr) < 0) { | |
1189 | put_system(dir); | |
1190 | return -ENODEV; | |
1191 | } | |
1192 | ||
e9dbfae5 | 1193 | ret = tracing_open_generic(inode, filp); |
8e2e2fa4 SRRH |
1194 | if (ret < 0) { |
1195 | trace_array_put(tr); | |
ae63b31e | 1196 | put_system(dir); |
8e2e2fa4 | 1197 | } |
ae63b31e SR |
1198 | |
1199 | return ret; | |
1200 | } | |
1201 | ||
1202 | static int system_tr_open(struct inode *inode, struct file *filp) | |
1203 | { | |
7967b3e0 | 1204 | struct trace_subsystem_dir *dir; |
ae63b31e SR |
1205 | struct trace_array *tr = inode->i_private; |
1206 | int ret; | |
1207 | ||
d6d3523c GB |
1208 | if (tracing_is_disabled()) |
1209 | return -ENODEV; | |
1210 | ||
8e2e2fa4 SRRH |
1211 | if (trace_array_get(tr) < 0) |
1212 | return -ENODEV; | |
1213 | ||
ae63b31e SR |
1214 | /* Make a temporary dir that has no system but points to tr */ |
1215 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); | |
8e2e2fa4 SRRH |
1216 | if (!dir) { |
1217 | trace_array_put(tr); | |
ae63b31e | 1218 | return -ENOMEM; |
8e2e2fa4 | 1219 | } |
ae63b31e SR |
1220 | |
1221 | dir->tr = tr; | |
1222 | ||
1223 | ret = tracing_open_generic(inode, filp); | |
8e2e2fa4 SRRH |
1224 | if (ret < 0) { |
1225 | trace_array_put(tr); | |
ae63b31e | 1226 | kfree(dir); |
d6d3523c | 1227 | return ret; |
8e2e2fa4 | 1228 | } |
ae63b31e SR |
1229 | |
1230 | filp->private_data = dir; | |
e9dbfae5 | 1231 | |
d6d3523c | 1232 | return 0; |
e9dbfae5 SR |
1233 | } |
1234 | ||
1235 | static int subsystem_release(struct inode *inode, struct file *file) | |
1236 | { | |
7967b3e0 | 1237 | struct trace_subsystem_dir *dir = file->private_data; |
e9dbfae5 | 1238 | |
8e2e2fa4 SRRH |
1239 | trace_array_put(dir->tr); |
1240 | ||
ae63b31e SR |
1241 | /* |
1242 | * If dir->subsystem is NULL, then this is a temporary | |
1243 | * descriptor that was made for a trace_array to enable | |
1244 | * all subsystems. | |
1245 | */ | |
1246 | if (dir->subsystem) | |
1247 | put_system(dir); | |
1248 | else | |
1249 | kfree(dir); | |
e9dbfae5 SR |
1250 | |
1251 | return 0; | |
1252 | } | |
1253 | ||
cfb180f3 TZ |
1254 | static ssize_t |
1255 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1256 | loff_t *ppos) | |
1257 | { | |
7967b3e0 | 1258 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1259 | struct event_subsystem *system = dir->subsystem; |
cfb180f3 TZ |
1260 | struct trace_seq *s; |
1261 | int r; | |
1262 | ||
1263 | if (*ppos) | |
1264 | return 0; | |
1265 | ||
1266 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1267 | if (!s) | |
1268 | return -ENOMEM; | |
1269 | ||
1270 | trace_seq_init(s); | |
1271 | ||
8b372562 | 1272 | print_subsystem_event_filter(system, s); |
5ac48378 SRRH |
1273 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1274 | s->buffer, trace_seq_used(s)); | |
cfb180f3 TZ |
1275 | |
1276 | kfree(s); | |
1277 | ||
1278 | return r; | |
1279 | } | |
1280 | ||
1281 | static ssize_t | |
1282 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1283 | loff_t *ppos) | |
1284 | { | |
7967b3e0 | 1285 | struct trace_subsystem_dir *dir = filp->private_data; |
8b372562 | 1286 | char *buf; |
cfb180f3 TZ |
1287 | int err; |
1288 | ||
8b372562 | 1289 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
1290 | return -EINVAL; |
1291 | ||
8b372562 TZ |
1292 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
1293 | if (!buf) | |
cfb180f3 TZ |
1294 | return -ENOMEM; |
1295 | ||
8b372562 TZ |
1296 | if (copy_from_user(buf, ubuf, cnt)) { |
1297 | free_page((unsigned long) buf); | |
1298 | return -EFAULT; | |
cfb180f3 | 1299 | } |
8b372562 | 1300 | buf[cnt] = '\0'; |
cfb180f3 | 1301 | |
ae63b31e | 1302 | err = apply_subsystem_event_filter(dir, buf); |
8b372562 TZ |
1303 | free_page((unsigned long) buf); |
1304 | if (err < 0) | |
44e9c8b7 | 1305 | return err; |
cfb180f3 TZ |
1306 | |
1307 | *ppos += cnt; | |
1308 | ||
1309 | return cnt; | |
1310 | } | |
1311 | ||
d1b182a8 SR |
1312 | static ssize_t |
1313 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1314 | { | |
1315 | int (*func)(struct trace_seq *s) = filp->private_data; | |
1316 | struct trace_seq *s; | |
1317 | int r; | |
1318 | ||
1319 | if (*ppos) | |
1320 | return 0; | |
1321 | ||
1322 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1323 | if (!s) | |
1324 | return -ENOMEM; | |
1325 | ||
1326 | trace_seq_init(s); | |
1327 | ||
1328 | func(s); | |
5ac48378 SRRH |
1329 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1330 | s->buffer, trace_seq_used(s)); | |
d1b182a8 SR |
1331 | |
1332 | kfree(s); | |
1333 | ||
1334 | return r; | |
1335 | } | |
1336 | ||
15075cac SR |
1337 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
1338 | static int ftrace_event_set_open(struct inode *inode, struct file *file); | |
f77d09a3 | 1339 | static int ftrace_event_release(struct inode *inode, struct file *file); |
15075cac | 1340 | |
b77e38aa SR |
1341 | static const struct seq_operations show_event_seq_ops = { |
1342 | .start = t_start, | |
1343 | .next = t_next, | |
1344 | .show = t_show, | |
1345 | .stop = t_stop, | |
1346 | }; | |
1347 | ||
1348 | static const struct seq_operations show_set_event_seq_ops = { | |
1349 | .start = s_start, | |
1350 | .next = s_next, | |
1351 | .show = t_show, | |
1352 | .stop = t_stop, | |
1353 | }; | |
1354 | ||
2314c4ae | 1355 | static const struct file_operations ftrace_avail_fops = { |
15075cac | 1356 | .open = ftrace_event_avail_open, |
2314c4ae SR |
1357 | .read = seq_read, |
1358 | .llseek = seq_lseek, | |
1359 | .release = seq_release, | |
1360 | }; | |
1361 | ||
b77e38aa | 1362 | static const struct file_operations ftrace_set_event_fops = { |
15075cac | 1363 | .open = ftrace_event_set_open, |
b77e38aa SR |
1364 | .read = seq_read, |
1365 | .write = ftrace_event_write, | |
1366 | .llseek = seq_lseek, | |
f77d09a3 | 1367 | .release = ftrace_event_release, |
b77e38aa SR |
1368 | }; |
1369 | ||
1473e441 | 1370 | static const struct file_operations ftrace_enable_fops = { |
bf682c31 | 1371 | .open = tracing_open_generic, |
1473e441 SR |
1372 | .read = event_enable_read, |
1373 | .write = event_enable_write, | |
6038f373 | 1374 | .llseek = default_llseek, |
1473e441 SR |
1375 | }; |
1376 | ||
981d081e | 1377 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
1378 | .open = trace_format_open, |
1379 | .read = seq_read, | |
1380 | .llseek = seq_lseek, | |
1381 | .release = seq_release, | |
981d081e SR |
1382 | }; |
1383 | ||
23725aee | 1384 | static const struct file_operations ftrace_event_id_fops = { |
23725aee | 1385 | .read = event_id_read, |
6038f373 | 1386 | .llseek = default_llseek, |
23725aee PZ |
1387 | }; |
1388 | ||
7ce7e424 TZ |
1389 | static const struct file_operations ftrace_event_filter_fops = { |
1390 | .open = tracing_open_generic, | |
1391 | .read = event_filter_read, | |
1392 | .write = event_filter_write, | |
6038f373 | 1393 | .llseek = default_llseek, |
7ce7e424 TZ |
1394 | }; |
1395 | ||
cfb180f3 | 1396 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 1397 | .open = subsystem_open, |
cfb180f3 TZ |
1398 | .read = subsystem_filter_read, |
1399 | .write = subsystem_filter_write, | |
6038f373 | 1400 | .llseek = default_llseek, |
e9dbfae5 | 1401 | .release = subsystem_release, |
cfb180f3 TZ |
1402 | }; |
1403 | ||
8ae79a13 | 1404 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 1405 | .open = subsystem_open, |
8ae79a13 SR |
1406 | .read = system_enable_read, |
1407 | .write = system_enable_write, | |
6038f373 | 1408 | .llseek = default_llseek, |
40ee4dff | 1409 | .release = subsystem_release, |
8ae79a13 SR |
1410 | }; |
1411 | ||
ae63b31e SR |
1412 | static const struct file_operations ftrace_tr_enable_fops = { |
1413 | .open = system_tr_open, | |
1414 | .read = system_enable_read, | |
1415 | .write = system_enable_write, | |
1416 | .llseek = default_llseek, | |
1417 | .release = subsystem_release, | |
1418 | }; | |
1419 | ||
d1b182a8 SR |
1420 | static const struct file_operations ftrace_show_header_fops = { |
1421 | .open = tracing_open_generic, | |
1422 | .read = show_header, | |
6038f373 | 1423 | .llseek = default_llseek, |
d1b182a8 SR |
1424 | }; |
1425 | ||
ae63b31e SR |
1426 | static int |
1427 | ftrace_event_open(struct inode *inode, struct file *file, | |
1428 | const struct seq_operations *seq_ops) | |
1473e441 | 1429 | { |
ae63b31e SR |
1430 | struct seq_file *m; |
1431 | int ret; | |
1473e441 | 1432 | |
ae63b31e SR |
1433 | ret = seq_open(file, seq_ops); |
1434 | if (ret < 0) | |
1435 | return ret; | |
1436 | m = file->private_data; | |
1437 | /* copy tr over to seq ops */ | |
1438 | m->private = inode->i_private; | |
1473e441 | 1439 | |
ae63b31e | 1440 | return ret; |
1473e441 SR |
1441 | } |
1442 | ||
f77d09a3 AL |
1443 | static int ftrace_event_release(struct inode *inode, struct file *file) |
1444 | { | |
1445 | struct trace_array *tr = inode->i_private; | |
1446 | ||
1447 | trace_array_put(tr); | |
1448 | ||
1449 | return seq_release(inode, file); | |
1450 | } | |
1451 | ||
15075cac SR |
1452 | static int |
1453 | ftrace_event_avail_open(struct inode *inode, struct file *file) | |
1454 | { | |
1455 | const struct seq_operations *seq_ops = &show_event_seq_ops; | |
1456 | ||
ae63b31e | 1457 | return ftrace_event_open(inode, file, seq_ops); |
15075cac SR |
1458 | } |
1459 | ||
1460 | static int | |
1461 | ftrace_event_set_open(struct inode *inode, struct file *file) | |
1462 | { | |
1463 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; | |
ae63b31e | 1464 | struct trace_array *tr = inode->i_private; |
f77d09a3 AL |
1465 | int ret; |
1466 | ||
1467 | if (trace_array_get(tr) < 0) | |
1468 | return -ENODEV; | |
15075cac SR |
1469 | |
1470 | if ((file->f_mode & FMODE_WRITE) && | |
1471 | (file->f_flags & O_TRUNC)) | |
ae63b31e | 1472 | ftrace_clear_events(tr); |
15075cac | 1473 | |
f77d09a3 AL |
1474 | ret = ftrace_event_open(inode, file, seq_ops); |
1475 | if (ret < 0) | |
1476 | trace_array_put(tr); | |
1477 | return ret; | |
ae63b31e SR |
1478 | } |
1479 | ||
1480 | static struct event_subsystem * | |
1481 | create_new_subsystem(const char *name) | |
1482 | { | |
1483 | struct event_subsystem *system; | |
1484 | ||
1485 | /* need to create new entry */ | |
1486 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1487 | if (!system) | |
1488 | return NULL; | |
1489 | ||
1490 | system->ref_count = 1; | |
6e94a780 SR |
1491 | |
1492 | /* Only allocate if dynamic (kprobes and modules) */ | |
79ac6ef5 RV |
1493 | system->name = kstrdup_const(name, GFP_KERNEL); |
1494 | if (!system->name) | |
1495 | goto out_free; | |
ae63b31e SR |
1496 | |
1497 | system->filter = NULL; | |
1498 | ||
1499 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); | |
1500 | if (!system->filter) | |
1501 | goto out_free; | |
1502 | ||
1503 | list_add(&system->list, &event_subsystems); | |
1504 | ||
1505 | return system; | |
1506 | ||
1507 | out_free: | |
79ac6ef5 | 1508 | kfree_const(system->name); |
ae63b31e SR |
1509 | kfree(system); |
1510 | return NULL; | |
15075cac SR |
1511 | } |
1512 | ||
6ecc2d1c | 1513 | static struct dentry * |
ae63b31e | 1514 | event_subsystem_dir(struct trace_array *tr, const char *name, |
7f1d2f82 | 1515 | struct trace_event_file *file, struct dentry *parent) |
6ecc2d1c | 1516 | { |
7967b3e0 | 1517 | struct trace_subsystem_dir *dir; |
6ecc2d1c | 1518 | struct event_subsystem *system; |
e1112b4d | 1519 | struct dentry *entry; |
6ecc2d1c SR |
1520 | |
1521 | /* First see if we did not already create this dir */ | |
ae63b31e SR |
1522 | list_for_each_entry(dir, &tr->systems, list) { |
1523 | system = dir->subsystem; | |
dc82ec98 | 1524 | if (strcmp(system->name, name) == 0) { |
ae63b31e SR |
1525 | dir->nr_events++; |
1526 | file->system = dir; | |
1527 | return dir->entry; | |
dc82ec98 | 1528 | } |
6ecc2d1c SR |
1529 | } |
1530 | ||
ae63b31e SR |
1531 | /* Now see if the system itself exists. */ |
1532 | list_for_each_entry(system, &event_subsystems, list) { | |
1533 | if (strcmp(system->name, name) == 0) | |
1534 | break; | |
6ecc2d1c | 1535 | } |
ae63b31e SR |
1536 | /* Reset system variable when not found */ |
1537 | if (&system->list == &event_subsystems) | |
1538 | system = NULL; | |
6ecc2d1c | 1539 | |
ae63b31e SR |
1540 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
1541 | if (!dir) | |
1542 | goto out_fail; | |
6ecc2d1c | 1543 | |
ae63b31e SR |
1544 | if (!system) { |
1545 | system = create_new_subsystem(name); | |
1546 | if (!system) | |
1547 | goto out_free; | |
1548 | } else | |
1549 | __get_system(system); | |
1550 | ||
8434dc93 | 1551 | dir->entry = tracefs_create_dir(name, parent); |
ae63b31e | 1552 | if (!dir->entry) { |
3448bac3 | 1553 | pr_warn("Failed to create system directory %s\n", name); |
ae63b31e SR |
1554 | __put_system(system); |
1555 | goto out_free; | |
6d723736 SR |
1556 | } |
1557 | ||
ae63b31e SR |
1558 | dir->tr = tr; |
1559 | dir->ref_count = 1; | |
1560 | dir->nr_events = 1; | |
1561 | dir->subsystem = system; | |
1562 | file->system = dir; | |
8b372562 | 1563 | |
8434dc93 | 1564 | entry = tracefs_create_file("filter", 0644, dir->entry, dir, |
e1112b4d | 1565 | &ftrace_subsystem_filter_fops); |
8b372562 TZ |
1566 | if (!entry) { |
1567 | kfree(system->filter); | |
1568 | system->filter = NULL; | |
8434dc93 | 1569 | pr_warn("Could not create tracefs '%s/filter' entry\n", name); |
8b372562 | 1570 | } |
e1112b4d | 1571 | |
ae63b31e | 1572 | trace_create_file("enable", 0644, dir->entry, dir, |
f3f3f009 | 1573 | &ftrace_system_enable_fops); |
8ae79a13 | 1574 | |
ae63b31e SR |
1575 | list_add(&dir->list, &tr->systems); |
1576 | ||
1577 | return dir->entry; | |
1578 | ||
1579 | out_free: | |
1580 | kfree(dir); | |
1581 | out_fail: | |
1582 | /* Only print this message if failed on memory allocation */ | |
1583 | if (!dir || !system) | |
3448bac3 | 1584 | pr_warn("No memory to create event subsystem %s\n", name); |
ae63b31e | 1585 | return NULL; |
6ecc2d1c SR |
1586 | } |
1587 | ||
1473e441 | 1588 | static int |
7f1d2f82 | 1589 | event_create_dir(struct dentry *parent, struct trace_event_file *file) |
1473e441 | 1590 | { |
2425bcb9 | 1591 | struct trace_event_call *call = file->event_call; |
ae63b31e | 1592 | struct trace_array *tr = file->tr; |
2e33af02 | 1593 | struct list_head *head; |
ae63b31e | 1594 | struct dentry *d_events; |
de7b2973 | 1595 | const char *name; |
fd994989 | 1596 | int ret; |
1473e441 | 1597 | |
6ecc2d1c SR |
1598 | /* |
1599 | * If the trace point header did not define TRACE_SYSTEM | |
1600 | * then the system would be called "TRACE_SYSTEM". | |
1601 | */ | |
ae63b31e SR |
1602 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { |
1603 | d_events = event_subsystem_dir(tr, call->class->system, file, parent); | |
1604 | if (!d_events) | |
1605 | return -ENOMEM; | |
1606 | } else | |
1607 | d_events = parent; | |
1608 | ||
687fcc4a | 1609 | name = trace_event_name(call); |
8434dc93 | 1610 | file->dir = tracefs_create_dir(name, d_events); |
ae63b31e | 1611 | if (!file->dir) { |
8434dc93 | 1612 | pr_warn("Could not create tracefs '%s' directory\n", name); |
1473e441 SR |
1613 | return -1; |
1614 | } | |
1615 | ||
9b63776f | 1616 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
ae63b31e | 1617 | trace_create_file("enable", 0644, file->dir, file, |
620a30e9 | 1618 | &ftrace_enable_fops); |
1473e441 | 1619 | |
2239291a | 1620 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 1621 | if (call->event.type && call->class->reg) |
1a11126b | 1622 | trace_create_file("id", 0444, file->dir, |
620a30e9 ON |
1623 | (void *)(long)call->event.type, |
1624 | &ftrace_event_id_fops); | |
2239291a | 1625 | #endif |
23725aee | 1626 | |
c9d932cf LZ |
1627 | /* |
1628 | * Other events may have the same class. Only update | |
1629 | * the fields if they are not already defined. | |
1630 | */ | |
1631 | head = trace_get_fields(call); | |
1632 | if (list_empty(head)) { | |
1633 | ret = call->class->define_fields(call); | |
1634 | if (ret < 0) { | |
3448bac3 FF |
1635 | pr_warn("Could not initialize trace point events/%s\n", |
1636 | name); | |
ae63b31e | 1637 | return -1; |
cf027f64 TZ |
1638 | } |
1639 | } | |
f306cc82 | 1640 | trace_create_file("filter", 0644, file->dir, file, |
620a30e9 | 1641 | &ftrace_event_filter_fops); |
cf027f64 | 1642 | |
85f2b082 TZ |
1643 | trace_create_file("trigger", 0644, file->dir, file, |
1644 | &event_trigger_fops); | |
1645 | ||
ae63b31e | 1646 | trace_create_file("format", 0444, file->dir, call, |
620a30e9 | 1647 | &ftrace_event_format_fops); |
6d723736 SR |
1648 | |
1649 | return 0; | |
1650 | } | |
1651 | ||
2425bcb9 | 1652 | static void remove_event_from_tracers(struct trace_event_call *call) |
ae63b31e | 1653 | { |
7f1d2f82 | 1654 | struct trace_event_file *file; |
ae63b31e SR |
1655 | struct trace_array *tr; |
1656 | ||
1657 | do_for_each_event_file_safe(tr, file) { | |
ae63b31e SR |
1658 | if (file->event_call != call) |
1659 | continue; | |
1660 | ||
f6a84bdc | 1661 | remove_event_file_dir(file); |
ae63b31e SR |
1662 | /* |
1663 | * The do_for_each_event_file_safe() is | |
1664 | * a double loop. After finding the call for this | |
1665 | * trace_array, we use break to jump to the next | |
1666 | * trace_array. | |
1667 | */ | |
1668 | break; | |
1669 | } while_for_each_event_file(); | |
1670 | } | |
1671 | ||
2425bcb9 | 1672 | static void event_remove(struct trace_event_call *call) |
8781915a | 1673 | { |
ae63b31e | 1674 | struct trace_array *tr; |
7f1d2f82 | 1675 | struct trace_event_file *file; |
ae63b31e SR |
1676 | |
1677 | do_for_each_event_file(tr, file) { | |
1678 | if (file->event_call != call) | |
1679 | continue; | |
1680 | ftrace_event_enable_disable(file, 0); | |
1681 | /* | |
1682 | * The do_for_each_event_file() is | |
1683 | * a double loop. After finding the call for this | |
1684 | * trace_array, we use break to jump to the next | |
1685 | * trace_array. | |
1686 | */ | |
1687 | break; | |
1688 | } while_for_each_event_file(); | |
1689 | ||
8781915a | 1690 | if (call->event.funcs) |
9023c930 | 1691 | __unregister_trace_event(&call->event); |
ae63b31e | 1692 | remove_event_from_tracers(call); |
8781915a EG |
1693 | list_del(&call->list); |
1694 | } | |
1695 | ||
2425bcb9 | 1696 | static int event_init(struct trace_event_call *call) |
8781915a EG |
1697 | { |
1698 | int ret = 0; | |
de7b2973 | 1699 | const char *name; |
8781915a | 1700 | |
687fcc4a | 1701 | name = trace_event_name(call); |
de7b2973 | 1702 | if (WARN_ON(!name)) |
8781915a EG |
1703 | return -EINVAL; |
1704 | ||
1705 | if (call->class->raw_init) { | |
1706 | ret = call->class->raw_init(call); | |
1707 | if (ret < 0 && ret != -ENOSYS) | |
3448bac3 | 1708 | pr_warn("Could not initialize trace events/%s\n", name); |
8781915a EG |
1709 | } |
1710 | ||
1711 | return ret; | |
1712 | } | |
1713 | ||
67ead0a6 | 1714 | static int |
2425bcb9 | 1715 | __register_event(struct trace_event_call *call, struct module *mod) |
bd1a5c84 | 1716 | { |
bd1a5c84 | 1717 | int ret; |
6d723736 | 1718 | |
8781915a EG |
1719 | ret = event_init(call); |
1720 | if (ret < 0) | |
1721 | return ret; | |
701970b3 | 1722 | |
ae63b31e | 1723 | list_add(&call->list, &ftrace_events); |
67ead0a6 | 1724 | call->mod = mod; |
88f70d75 | 1725 | |
ae63b31e | 1726 | return 0; |
bd1a5c84 MH |
1727 | } |
1728 | ||
0c564a53 SRRH |
1729 | static char *enum_replace(char *ptr, struct trace_enum_map *map, int len) |
1730 | { | |
1731 | int rlen; | |
1732 | int elen; | |
1733 | ||
1734 | /* Find the length of the enum value as a string */ | |
1735 | elen = snprintf(ptr, 0, "%ld", map->enum_value); | |
1736 | /* Make sure there's enough room to replace the string with the value */ | |
1737 | if (len < elen) | |
1738 | return NULL; | |
1739 | ||
1740 | snprintf(ptr, elen + 1, "%ld", map->enum_value); | |
1741 | ||
1742 | /* Get the rest of the string of ptr */ | |
1743 | rlen = strlen(ptr + len); | |
1744 | memmove(ptr + elen, ptr + len, rlen); | |
1745 | /* Make sure we end the new string */ | |
1746 | ptr[elen + rlen] = 0; | |
1747 | ||
1748 | return ptr + elen; | |
1749 | } | |
1750 | ||
2425bcb9 | 1751 | static void update_event_printk(struct trace_event_call *call, |
0c564a53 SRRH |
1752 | struct trace_enum_map *map) |
1753 | { | |
1754 | char *ptr; | |
1755 | int quote = 0; | |
1756 | int len = strlen(map->enum_string); | |
1757 | ||
1758 | for (ptr = call->print_fmt; *ptr; ptr++) { | |
1759 | if (*ptr == '\\') { | |
1760 | ptr++; | |
1761 | /* paranoid */ | |
1762 | if (!*ptr) | |
1763 | break; | |
1764 | continue; | |
1765 | } | |
1766 | if (*ptr == '"') { | |
1767 | quote ^= 1; | |
1768 | continue; | |
1769 | } | |
1770 | if (quote) | |
1771 | continue; | |
1772 | if (isdigit(*ptr)) { | |
1773 | /* skip numbers */ | |
1774 | do { | |
1775 | ptr++; | |
1776 | /* Check for alpha chars like ULL */ | |
1777 | } while (isalnum(*ptr)); | |
3193899d SRRH |
1778 | if (!*ptr) |
1779 | break; | |
0c564a53 SRRH |
1780 | /* |
1781 | * A number must have some kind of delimiter after | |
1782 | * it, and we can ignore that too. | |
1783 | */ | |
1784 | continue; | |
1785 | } | |
1786 | if (isalpha(*ptr) || *ptr == '_') { | |
1787 | if (strncmp(map->enum_string, ptr, len) == 0 && | |
1788 | !isalnum(ptr[len]) && ptr[len] != '_') { | |
1789 | ptr = enum_replace(ptr, map, len); | |
1790 | /* Hmm, enum string smaller than value */ | |
1791 | if (WARN_ON_ONCE(!ptr)) | |
1792 | return; | |
1793 | /* | |
1794 | * No need to decrement here, as enum_replace() | |
1795 | * returns the pointer to the character passed | |
1796 | * the enum, and two enums can not be placed | |
1797 | * back to back without something in between. | |
1798 | * We can skip that something in between. | |
1799 | */ | |
1800 | continue; | |
1801 | } | |
1802 | skip_more: | |
1803 | do { | |
1804 | ptr++; | |
1805 | } while (isalnum(*ptr) || *ptr == '_'); | |
3193899d SRRH |
1806 | if (!*ptr) |
1807 | break; | |
0c564a53 SRRH |
1808 | /* |
1809 | * If what comes after this variable is a '.' or | |
1810 | * '->' then we can continue to ignore that string. | |
1811 | */ | |
1812 | if (*ptr == '.' || (ptr[0] == '-' && ptr[1] == '>')) { | |
1813 | ptr += *ptr == '.' ? 1 : 2; | |
3193899d SRRH |
1814 | if (!*ptr) |
1815 | break; | |
0c564a53 SRRH |
1816 | goto skip_more; |
1817 | } | |
1818 | /* | |
1819 | * Once again, we can skip the delimiter that came | |
1820 | * after the string. | |
1821 | */ | |
1822 | continue; | |
1823 | } | |
1824 | } | |
1825 | } | |
1826 | ||
1827 | void trace_event_enum_update(struct trace_enum_map **map, int len) | |
1828 | { | |
2425bcb9 | 1829 | struct trace_event_call *call, *p; |
0c564a53 SRRH |
1830 | const char *last_system = NULL; |
1831 | int last_i; | |
1832 | int i; | |
1833 | ||
1834 | down_write(&trace_event_sem); | |
1835 | list_for_each_entry_safe(call, p, &ftrace_events, list) { | |
1836 | /* events are usually grouped together with systems */ | |
1837 | if (!last_system || call->class->system != last_system) { | |
1838 | last_i = 0; | |
1839 | last_system = call->class->system; | |
1840 | } | |
1841 | ||
1842 | for (i = last_i; i < len; i++) { | |
1843 | if (call->class->system == map[i]->system) { | |
1844 | /* Save the first system if need be */ | |
1845 | if (!last_i) | |
1846 | last_i = i; | |
1847 | update_event_printk(call, map[i]); | |
1848 | } | |
1849 | } | |
1850 | } | |
1851 | up_write(&trace_event_sem); | |
1852 | } | |
1853 | ||
7f1d2f82 | 1854 | static struct trace_event_file * |
2425bcb9 | 1855 | trace_create_new_event(struct trace_event_call *call, |
da511bf3 SRRH |
1856 | struct trace_array *tr) |
1857 | { | |
7f1d2f82 | 1858 | struct trace_event_file *file; |
da511bf3 SRRH |
1859 | |
1860 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); | |
1861 | if (!file) | |
1862 | return NULL; | |
1863 | ||
1864 | file->event_call = call; | |
1865 | file->tr = tr; | |
1866 | atomic_set(&file->sm_ref, 0); | |
85f2b082 TZ |
1867 | atomic_set(&file->tm_ref, 0); |
1868 | INIT_LIST_HEAD(&file->triggers); | |
da511bf3 SRRH |
1869 | list_add(&file->list, &tr->events); |
1870 | ||
1871 | return file; | |
1872 | } | |
1873 | ||
ae63b31e SR |
1874 | /* Add an event to a trace directory */ |
1875 | static int | |
2425bcb9 | 1876 | __trace_add_new_event(struct trace_event_call *call, struct trace_array *tr) |
ae63b31e | 1877 | { |
7f1d2f82 | 1878 | struct trace_event_file *file; |
ae63b31e | 1879 | |
da511bf3 | 1880 | file = trace_create_new_event(call, tr); |
ae63b31e SR |
1881 | if (!file) |
1882 | return -ENOMEM; | |
1883 | ||
620a30e9 | 1884 | return event_create_dir(tr->event_dir, file); |
ae63b31e SR |
1885 | } |
1886 | ||
77248221 SR |
1887 | /* |
1888 | * Just create a decriptor for early init. A descriptor is required | |
1889 | * for enabling events at boot. We want to enable events before | |
1890 | * the filesystem is initialized. | |
1891 | */ | |
1892 | static __init int | |
2425bcb9 | 1893 | __trace_early_add_new_event(struct trace_event_call *call, |
77248221 SR |
1894 | struct trace_array *tr) |
1895 | { | |
7f1d2f82 | 1896 | struct trace_event_file *file; |
77248221 | 1897 | |
da511bf3 | 1898 | file = trace_create_new_event(call, tr); |
77248221 SR |
1899 | if (!file) |
1900 | return -ENOMEM; | |
1901 | ||
77248221 SR |
1902 | return 0; |
1903 | } | |
1904 | ||
ae63b31e | 1905 | struct ftrace_module_file_ops; |
2425bcb9 | 1906 | static void __add_event_to_tracers(struct trace_event_call *call); |
ae63b31e | 1907 | |
bd1a5c84 | 1908 | /* Add an additional event_call dynamically */ |
2425bcb9 | 1909 | int trace_add_event_call(struct trace_event_call *call) |
bd1a5c84 MH |
1910 | { |
1911 | int ret; | |
a8227415 | 1912 | mutex_lock(&trace_types_lock); |
bd1a5c84 | 1913 | mutex_lock(&event_mutex); |
701970b3 | 1914 | |
ae63b31e SR |
1915 | ret = __register_event(call, NULL); |
1916 | if (ret >= 0) | |
779c5e37 | 1917 | __add_event_to_tracers(call); |
a2ca5e03 | 1918 | |
ae63b31e | 1919 | mutex_unlock(&event_mutex); |
a8227415 | 1920 | mutex_unlock(&trace_types_lock); |
ae63b31e | 1921 | return ret; |
a2ca5e03 FW |
1922 | } |
1923 | ||
4fead8e4 | 1924 | /* |
a8227415 AL |
1925 | * Must be called under locking of trace_types_lock, event_mutex and |
1926 | * trace_event_sem. | |
4fead8e4 | 1927 | */ |
2425bcb9 | 1928 | static void __trace_remove_event_call(struct trace_event_call *call) |
bd1a5c84 | 1929 | { |
8781915a | 1930 | event_remove(call); |
bd1a5c84 | 1931 | trace_destroy_fields(call); |
57375747 ON |
1932 | free_event_filter(call->filter); |
1933 | call->filter = NULL; | |
bd1a5c84 MH |
1934 | } |
1935 | ||
2425bcb9 | 1936 | static int probe_remove_event_call(struct trace_event_call *call) |
2816c551 ON |
1937 | { |
1938 | struct trace_array *tr; | |
7f1d2f82 | 1939 | struct trace_event_file *file; |
2816c551 ON |
1940 | |
1941 | #ifdef CONFIG_PERF_EVENTS | |
1942 | if (call->perf_refcount) | |
1943 | return -EBUSY; | |
1944 | #endif | |
1945 | do_for_each_event_file(tr, file) { | |
1946 | if (file->event_call != call) | |
1947 | continue; | |
1948 | /* | |
1949 | * We can't rely on ftrace_event_enable_disable(enable => 0) | |
5d6ad960 | 1950 | * we are going to do, EVENT_FILE_FL_SOFT_MODE can suppress |
2816c551 ON |
1951 | * TRACE_REG_UNREGISTER. |
1952 | */ | |
5d6ad960 | 1953 | if (file->flags & EVENT_FILE_FL_ENABLED) |
2816c551 | 1954 | return -EBUSY; |
2ba64035 SRRH |
1955 | /* |
1956 | * The do_for_each_event_file_safe() is | |
1957 | * a double loop. After finding the call for this | |
1958 | * trace_array, we use break to jump to the next | |
1959 | * trace_array. | |
1960 | */ | |
2816c551 ON |
1961 | break; |
1962 | } while_for_each_event_file(); | |
1963 | ||
1964 | __trace_remove_event_call(call); | |
1965 | ||
1966 | return 0; | |
1967 | } | |
1968 | ||
bd1a5c84 | 1969 | /* Remove an event_call */ |
2425bcb9 | 1970 | int trace_remove_event_call(struct trace_event_call *call) |
bd1a5c84 | 1971 | { |
2816c551 ON |
1972 | int ret; |
1973 | ||
a8227415 | 1974 | mutex_lock(&trace_types_lock); |
bd1a5c84 | 1975 | mutex_lock(&event_mutex); |
52f6ad6d | 1976 | down_write(&trace_event_sem); |
2816c551 | 1977 | ret = probe_remove_event_call(call); |
52f6ad6d | 1978 | up_write(&trace_event_sem); |
bd1a5c84 | 1979 | mutex_unlock(&event_mutex); |
a8227415 | 1980 | mutex_unlock(&trace_types_lock); |
2816c551 ON |
1981 | |
1982 | return ret; | |
bd1a5c84 MH |
1983 | } |
1984 | ||
1985 | #define for_each_event(event, start, end) \ | |
1986 | for (event = start; \ | |
1987 | (unsigned long)event < (unsigned long)end; \ | |
1988 | event++) | |
1989 | ||
1990 | #ifdef CONFIG_MODULES | |
1991 | ||
6d723736 SR |
1992 | static void trace_module_add_events(struct module *mod) |
1993 | { | |
2425bcb9 | 1994 | struct trace_event_call **call, **start, **end; |
6d723736 | 1995 | |
45ab2813 SRRH |
1996 | if (!mod->num_trace_events) |
1997 | return; | |
1998 | ||
1999 | /* Don't add infrastructure for mods without tracepoints */ | |
2000 | if (trace_module_has_bad_taint(mod)) { | |
2001 | pr_err("%s: module has bad taint, not creating trace events\n", | |
2002 | mod->name); | |
2003 | return; | |
2004 | } | |
2005 | ||
6d723736 SR |
2006 | start = mod->trace_events; |
2007 | end = mod->trace_events + mod->num_trace_events; | |
2008 | ||
6d723736 | 2009 | for_each_event(call, start, end) { |
ae63b31e | 2010 | __register_event(*call, mod); |
779c5e37 | 2011 | __add_event_to_tracers(*call); |
6d723736 SR |
2012 | } |
2013 | } | |
2014 | ||
2015 | static void trace_module_remove_events(struct module *mod) | |
2016 | { | |
2425bcb9 | 2017 | struct trace_event_call *call, *p; |
575380da | 2018 | bool clear_trace = false; |
6d723736 | 2019 | |
52f6ad6d | 2020 | down_write(&trace_event_sem); |
6d723736 SR |
2021 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
2022 | if (call->mod == mod) { | |
575380da SRRH |
2023 | if (call->flags & TRACE_EVENT_FL_WAS_ENABLED) |
2024 | clear_trace = true; | |
bd1a5c84 | 2025 | __trace_remove_event_call(call); |
6d723736 SR |
2026 | } |
2027 | } | |
52f6ad6d | 2028 | up_write(&trace_event_sem); |
9456f0fa SR |
2029 | |
2030 | /* | |
2031 | * It is safest to reset the ring buffer if the module being unloaded | |
873c642f SRRH |
2032 | * registered any events that were used. The only worry is if |
2033 | * a new module gets loaded, and takes on the same id as the events | |
2034 | * of this module. When printing out the buffer, traced events left | |
2035 | * over from this module may be passed to the new module events and | |
2036 | * unexpected results may occur. | |
9456f0fa | 2037 | */ |
575380da | 2038 | if (clear_trace) |
873c642f | 2039 | tracing_reset_all_online_cpus(); |
6d723736 SR |
2040 | } |
2041 | ||
61f919a1 SR |
2042 | static int trace_module_notify(struct notifier_block *self, |
2043 | unsigned long val, void *data) | |
6d723736 SR |
2044 | { |
2045 | struct module *mod = data; | |
2046 | ||
a8227415 | 2047 | mutex_lock(&trace_types_lock); |
6d723736 SR |
2048 | mutex_lock(&event_mutex); |
2049 | switch (val) { | |
2050 | case MODULE_STATE_COMING: | |
2051 | trace_module_add_events(mod); | |
2052 | break; | |
2053 | case MODULE_STATE_GOING: | |
2054 | trace_module_remove_events(mod); | |
2055 | break; | |
2056 | } | |
2057 | mutex_unlock(&event_mutex); | |
a8227415 | 2058 | mutex_unlock(&trace_types_lock); |
fd994989 | 2059 | |
1473e441 SR |
2060 | return 0; |
2061 | } | |
315326c1 | 2062 | |
836d481e ON |
2063 | static struct notifier_block trace_module_nb = { |
2064 | .notifier_call = trace_module_notify, | |
3673b8e4 | 2065 | .priority = 1, /* higher than trace.c module notify */ |
836d481e | 2066 | }; |
61f919a1 | 2067 | #endif /* CONFIG_MODULES */ |
1473e441 | 2068 | |
ae63b31e SR |
2069 | /* Create a new event directory structure for a trace directory. */ |
2070 | static void | |
2071 | __trace_add_event_dirs(struct trace_array *tr) | |
2072 | { | |
2425bcb9 | 2073 | struct trace_event_call *call; |
ae63b31e SR |
2074 | int ret; |
2075 | ||
2076 | list_for_each_entry(call, &ftrace_events, list) { | |
620a30e9 | 2077 | ret = __trace_add_new_event(call, tr); |
ae63b31e | 2078 | if (ret < 0) |
3448bac3 | 2079 | pr_warn("Could not create directory for event %s\n", |
687fcc4a | 2080 | trace_event_name(call)); |
ae63b31e SR |
2081 | } |
2082 | } | |
2083 | ||
7f1d2f82 | 2084 | struct trace_event_file * |
3cd715de SRRH |
2085 | find_event_file(struct trace_array *tr, const char *system, const char *event) |
2086 | { | |
7f1d2f82 | 2087 | struct trace_event_file *file; |
2425bcb9 | 2088 | struct trace_event_call *call; |
de7b2973 | 2089 | const char *name; |
3cd715de SRRH |
2090 | |
2091 | list_for_each_entry(file, &tr->events, list) { | |
2092 | ||
2093 | call = file->event_call; | |
687fcc4a | 2094 | name = trace_event_name(call); |
3cd715de | 2095 | |
de7b2973 | 2096 | if (!name || !call->class || !call->class->reg) |
3cd715de SRRH |
2097 | continue; |
2098 | ||
2099 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) | |
2100 | continue; | |
2101 | ||
de7b2973 | 2102 | if (strcmp(event, name) == 0 && |
3cd715de SRRH |
2103 | strcmp(system, call->class->system) == 0) |
2104 | return file; | |
2105 | } | |
2106 | return NULL; | |
2107 | } | |
2108 | ||
2875a08b SRRH |
2109 | #ifdef CONFIG_DYNAMIC_FTRACE |
2110 | ||
2111 | /* Avoid typos */ | |
2112 | #define ENABLE_EVENT_STR "enable_event" | |
2113 | #define DISABLE_EVENT_STR "disable_event" | |
2114 | ||
2115 | struct event_probe_data { | |
7f1d2f82 | 2116 | struct trace_event_file *file; |
2875a08b SRRH |
2117 | unsigned long count; |
2118 | int ref; | |
2119 | bool enable; | |
2120 | }; | |
2121 | ||
3cd715de SRRH |
2122 | static void |
2123 | event_enable_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
2124 | { | |
2125 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2126 | struct event_probe_data *data = *pdata; | |
2127 | ||
2128 | if (!data) | |
2129 | return; | |
2130 | ||
2131 | if (data->enable) | |
5d6ad960 | 2132 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); |
3cd715de | 2133 | else |
5d6ad960 | 2134 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); |
3cd715de SRRH |
2135 | } |
2136 | ||
2137 | static void | |
2138 | event_enable_count_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
2139 | { | |
2140 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2141 | struct event_probe_data *data = *pdata; | |
2142 | ||
2143 | if (!data) | |
2144 | return; | |
2145 | ||
2146 | if (!data->count) | |
2147 | return; | |
2148 | ||
2149 | /* Skip if the event is in a state we want to switch to */ | |
5d6ad960 | 2150 | if (data->enable == !(data->file->flags & EVENT_FILE_FL_SOFT_DISABLED)) |
3cd715de SRRH |
2151 | return; |
2152 | ||
2153 | if (data->count != -1) | |
2154 | (data->count)--; | |
2155 | ||
2156 | event_enable_probe(ip, parent_ip, _data); | |
2157 | } | |
2158 | ||
2159 | static int | |
2160 | event_enable_print(struct seq_file *m, unsigned long ip, | |
2161 | struct ftrace_probe_ops *ops, void *_data) | |
2162 | { | |
2163 | struct event_probe_data *data = _data; | |
2164 | ||
2165 | seq_printf(m, "%ps:", (void *)ip); | |
2166 | ||
2167 | seq_printf(m, "%s:%s:%s", | |
2168 | data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR, | |
2169 | data->file->event_call->class->system, | |
687fcc4a | 2170 | trace_event_name(data->file->event_call)); |
3cd715de SRRH |
2171 | |
2172 | if (data->count == -1) | |
fa6f0cc7 | 2173 | seq_puts(m, ":unlimited\n"); |
3cd715de SRRH |
2174 | else |
2175 | seq_printf(m, ":count=%ld\n", data->count); | |
2176 | ||
2177 | return 0; | |
2178 | } | |
2179 | ||
2180 | static int | |
2181 | event_enable_init(struct ftrace_probe_ops *ops, unsigned long ip, | |
2182 | void **_data) | |
2183 | { | |
2184 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2185 | struct event_probe_data *data = *pdata; | |
2186 | ||
2187 | data->ref++; | |
2188 | return 0; | |
2189 | } | |
2190 | ||
2191 | static void | |
2192 | event_enable_free(struct ftrace_probe_ops *ops, unsigned long ip, | |
2193 | void **_data) | |
2194 | { | |
2195 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2196 | struct event_probe_data *data = *pdata; | |
2197 | ||
2198 | if (WARN_ON_ONCE(data->ref <= 0)) | |
2199 | return; | |
2200 | ||
2201 | data->ref--; | |
2202 | if (!data->ref) { | |
2203 | /* Remove the SOFT_MODE flag */ | |
2204 | __ftrace_event_enable_disable(data->file, 0, 1); | |
2205 | module_put(data->file->event_call->mod); | |
2206 | kfree(data); | |
2207 | } | |
2208 | *pdata = NULL; | |
2209 | } | |
2210 | ||
2211 | static struct ftrace_probe_ops event_enable_probe_ops = { | |
2212 | .func = event_enable_probe, | |
2213 | .print = event_enable_print, | |
2214 | .init = event_enable_init, | |
2215 | .free = event_enable_free, | |
2216 | }; | |
2217 | ||
2218 | static struct ftrace_probe_ops event_enable_count_probe_ops = { | |
2219 | .func = event_enable_count_probe, | |
2220 | .print = event_enable_print, | |
2221 | .init = event_enable_init, | |
2222 | .free = event_enable_free, | |
2223 | }; | |
2224 | ||
2225 | static struct ftrace_probe_ops event_disable_probe_ops = { | |
2226 | .func = event_enable_probe, | |
2227 | .print = event_enable_print, | |
2228 | .init = event_enable_init, | |
2229 | .free = event_enable_free, | |
2230 | }; | |
2231 | ||
2232 | static struct ftrace_probe_ops event_disable_count_probe_ops = { | |
2233 | .func = event_enable_count_probe, | |
2234 | .print = event_enable_print, | |
2235 | .init = event_enable_init, | |
2236 | .free = event_enable_free, | |
2237 | }; | |
2238 | ||
2239 | static int | |
2240 | event_enable_func(struct ftrace_hash *hash, | |
2241 | char *glob, char *cmd, char *param, int enabled) | |
2242 | { | |
2243 | struct trace_array *tr = top_trace_array(); | |
7f1d2f82 | 2244 | struct trace_event_file *file; |
3cd715de SRRH |
2245 | struct ftrace_probe_ops *ops; |
2246 | struct event_probe_data *data; | |
2247 | const char *system; | |
2248 | const char *event; | |
2249 | char *number; | |
2250 | bool enable; | |
2251 | int ret; | |
2252 | ||
dc81e5e3 YY |
2253 | if (!tr) |
2254 | return -ENODEV; | |
2255 | ||
3cd715de | 2256 | /* hash funcs only work with set_ftrace_filter */ |
8092e808 | 2257 | if (!enabled || !param) |
3cd715de SRRH |
2258 | return -EINVAL; |
2259 | ||
2260 | system = strsep(¶m, ":"); | |
2261 | if (!param) | |
2262 | return -EINVAL; | |
2263 | ||
2264 | event = strsep(¶m, ":"); | |
2265 | ||
2266 | mutex_lock(&event_mutex); | |
2267 | ||
2268 | ret = -EINVAL; | |
2269 | file = find_event_file(tr, system, event); | |
2270 | if (!file) | |
2271 | goto out; | |
2272 | ||
2273 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; | |
2274 | ||
2275 | if (enable) | |
2276 | ops = param ? &event_enable_count_probe_ops : &event_enable_probe_ops; | |
2277 | else | |
2278 | ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops; | |
2279 | ||
2280 | if (glob[0] == '!') { | |
2281 | unregister_ftrace_function_probe_func(glob+1, ops); | |
2282 | ret = 0; | |
2283 | goto out; | |
2284 | } | |
2285 | ||
2286 | ret = -ENOMEM; | |
2287 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
2288 | if (!data) | |
2289 | goto out; | |
2290 | ||
2291 | data->enable = enable; | |
2292 | data->count = -1; | |
2293 | data->file = file; | |
2294 | ||
2295 | if (!param) | |
2296 | goto out_reg; | |
2297 | ||
2298 | number = strsep(¶m, ":"); | |
2299 | ||
2300 | ret = -EINVAL; | |
2301 | if (!strlen(number)) | |
2302 | goto out_free; | |
2303 | ||
2304 | /* | |
2305 | * We use the callback data field (which is a pointer) | |
2306 | * as our counter. | |
2307 | */ | |
2308 | ret = kstrtoul(number, 0, &data->count); | |
2309 | if (ret) | |
2310 | goto out_free; | |
2311 | ||
2312 | out_reg: | |
2313 | /* Don't let event modules unload while probe registered */ | |
2314 | ret = try_module_get(file->event_call->mod); | |
6ed01066 MH |
2315 | if (!ret) { |
2316 | ret = -EBUSY; | |
3cd715de | 2317 | goto out_free; |
6ed01066 | 2318 | } |
3cd715de SRRH |
2319 | |
2320 | ret = __ftrace_event_enable_disable(file, 1, 1); | |
2321 | if (ret < 0) | |
2322 | goto out_put; | |
2323 | ret = register_ftrace_function_probe(glob, ops, data); | |
ff305ded SRRH |
2324 | /* |
2325 | * The above returns on success the # of functions enabled, | |
2326 | * but if it didn't find any functions it returns zero. | |
2327 | * Consider no functions a failure too. | |
2328 | */ | |
a5b85bd1 MH |
2329 | if (!ret) { |
2330 | ret = -ENOENT; | |
3cd715de | 2331 | goto out_disable; |
ff305ded SRRH |
2332 | } else if (ret < 0) |
2333 | goto out_disable; | |
2334 | /* Just return zero, not the number of enabled functions */ | |
2335 | ret = 0; | |
3cd715de SRRH |
2336 | out: |
2337 | mutex_unlock(&event_mutex); | |
2338 | return ret; | |
2339 | ||
2340 | out_disable: | |
2341 | __ftrace_event_enable_disable(file, 0, 1); | |
2342 | out_put: | |
2343 | module_put(file->event_call->mod); | |
2344 | out_free: | |
2345 | kfree(data); | |
2346 | goto out; | |
2347 | } | |
2348 | ||
2349 | static struct ftrace_func_command event_enable_cmd = { | |
2350 | .name = ENABLE_EVENT_STR, | |
2351 | .func = event_enable_func, | |
2352 | }; | |
2353 | ||
2354 | static struct ftrace_func_command event_disable_cmd = { | |
2355 | .name = DISABLE_EVENT_STR, | |
2356 | .func = event_enable_func, | |
2357 | }; | |
2358 | ||
2359 | static __init int register_event_cmds(void) | |
2360 | { | |
2361 | int ret; | |
2362 | ||
2363 | ret = register_ftrace_command(&event_enable_cmd); | |
2364 | if (WARN_ON(ret < 0)) | |
2365 | return ret; | |
2366 | ret = register_ftrace_command(&event_disable_cmd); | |
2367 | if (WARN_ON(ret < 0)) | |
2368 | unregister_ftrace_command(&event_enable_cmd); | |
2369 | return ret; | |
2370 | } | |
2371 | #else | |
2372 | static inline int register_event_cmds(void) { return 0; } | |
2373 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
2374 | ||
77248221 | 2375 | /* |
7f1d2f82 | 2376 | * The top level array has already had its trace_event_file |
77248221 | 2377 | * descriptors created in order to allow for early events to |
8434dc93 | 2378 | * be recorded. This function is called after the tracefs has been |
77248221 SR |
2379 | * initialized, and we now have to create the files associated |
2380 | * to the events. | |
2381 | */ | |
2382 | static __init void | |
2383 | __trace_early_add_event_dirs(struct trace_array *tr) | |
2384 | { | |
7f1d2f82 | 2385 | struct trace_event_file *file; |
77248221 SR |
2386 | int ret; |
2387 | ||
2388 | ||
2389 | list_for_each_entry(file, &tr->events, list) { | |
620a30e9 | 2390 | ret = event_create_dir(tr->event_dir, file); |
77248221 | 2391 | if (ret < 0) |
3448bac3 | 2392 | pr_warn("Could not create directory for event %s\n", |
687fcc4a | 2393 | trace_event_name(file->event_call)); |
77248221 SR |
2394 | } |
2395 | } | |
2396 | ||
2397 | /* | |
2398 | * For early boot up, the top trace array requires to have | |
2399 | * a list of events that can be enabled. This must be done before | |
2400 | * the filesystem is set up in order to allow events to be traced | |
2401 | * early. | |
2402 | */ | |
2403 | static __init void | |
2404 | __trace_early_add_events(struct trace_array *tr) | |
2405 | { | |
2425bcb9 | 2406 | struct trace_event_call *call; |
77248221 SR |
2407 | int ret; |
2408 | ||
2409 | list_for_each_entry(call, &ftrace_events, list) { | |
2410 | /* Early boot up should not have any modules loaded */ | |
2411 | if (WARN_ON_ONCE(call->mod)) | |
2412 | continue; | |
2413 | ||
2414 | ret = __trace_early_add_new_event(call, tr); | |
2415 | if (ret < 0) | |
3448bac3 | 2416 | pr_warn("Could not create early event %s\n", |
687fcc4a | 2417 | trace_event_name(call)); |
77248221 SR |
2418 | } |
2419 | } | |
2420 | ||
0c8916c3 SR |
2421 | /* Remove the event directory structure for a trace directory. */ |
2422 | static void | |
2423 | __trace_remove_event_dirs(struct trace_array *tr) | |
2424 | { | |
7f1d2f82 | 2425 | struct trace_event_file *file, *next; |
0c8916c3 | 2426 | |
f6a84bdc ON |
2427 | list_for_each_entry_safe(file, next, &tr->events, list) |
2428 | remove_event_file_dir(file); | |
0c8916c3 SR |
2429 | } |
2430 | ||
2425bcb9 | 2431 | static void __add_event_to_tracers(struct trace_event_call *call) |
ae63b31e SR |
2432 | { |
2433 | struct trace_array *tr; | |
2434 | ||
620a30e9 ON |
2435 | list_for_each_entry(tr, &ftrace_trace_arrays, list) |
2436 | __trace_add_new_event(call, tr); | |
ae63b31e SR |
2437 | } |
2438 | ||
2425bcb9 SRRH |
2439 | extern struct trace_event_call *__start_ftrace_events[]; |
2440 | extern struct trace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 2441 | |
020e5f85 LZ |
2442 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
2443 | ||
2444 | static __init int setup_trace_event(char *str) | |
2445 | { | |
2446 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
55034cd6 SRRH |
2447 | ring_buffer_expanded = true; |
2448 | tracing_selftest_disabled = true; | |
020e5f85 LZ |
2449 | |
2450 | return 1; | |
2451 | } | |
2452 | __setup("trace_event=", setup_trace_event); | |
2453 | ||
77248221 SR |
2454 | /* Expects to have event_mutex held when called */ |
2455 | static int | |
2456 | create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) | |
ae63b31e SR |
2457 | { |
2458 | struct dentry *d_events; | |
2459 | struct dentry *entry; | |
2460 | ||
8434dc93 | 2461 | entry = tracefs_create_file("set_event", 0644, parent, |
ae63b31e SR |
2462 | tr, &ftrace_set_event_fops); |
2463 | if (!entry) { | |
8434dc93 | 2464 | pr_warn("Could not create tracefs 'set_event' entry\n"); |
ae63b31e SR |
2465 | return -ENOMEM; |
2466 | } | |
2467 | ||
8434dc93 | 2468 | d_events = tracefs_create_dir("events", parent); |
277ba044 | 2469 | if (!d_events) { |
8434dc93 | 2470 | pr_warn("Could not create tracefs 'events' directory\n"); |
277ba044 SR |
2471 | return -ENOMEM; |
2472 | } | |
ae63b31e SR |
2473 | |
2474 | /* ring buffer internal formats */ | |
2475 | trace_create_file("header_page", 0444, d_events, | |
2476 | ring_buffer_print_page_header, | |
2477 | &ftrace_show_header_fops); | |
2478 | ||
2479 | trace_create_file("header_event", 0444, d_events, | |
2480 | ring_buffer_print_entry_header, | |
2481 | &ftrace_show_header_fops); | |
2482 | ||
2483 | trace_create_file("enable", 0644, d_events, | |
2484 | tr, &ftrace_tr_enable_fops); | |
2485 | ||
2486 | tr->event_dir = d_events; | |
77248221 SR |
2487 | |
2488 | return 0; | |
2489 | } | |
2490 | ||
2491 | /** | |
2492 | * event_trace_add_tracer - add a instance of a trace_array to events | |
2493 | * @parent: The parent dentry to place the files/directories for events in | |
2494 | * @tr: The trace array associated with these events | |
2495 | * | |
2496 | * When a new instance is created, it needs to set up its events | |
2497 | * directory, as well as other files associated with events. It also | |
2498 | * creates the event hierachry in the @parent/events directory. | |
2499 | * | |
2500 | * Returns 0 on success. | |
2501 | */ | |
2502 | int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2503 | { | |
2504 | int ret; | |
2505 | ||
2506 | mutex_lock(&event_mutex); | |
2507 | ||
2508 | ret = create_event_toplevel_files(parent, tr); | |
2509 | if (ret) | |
2510 | goto out_unlock; | |
2511 | ||
52f6ad6d | 2512 | down_write(&trace_event_sem); |
ae63b31e | 2513 | __trace_add_event_dirs(tr); |
52f6ad6d | 2514 | up_write(&trace_event_sem); |
277ba044 | 2515 | |
77248221 | 2516 | out_unlock: |
277ba044 | 2517 | mutex_unlock(&event_mutex); |
ae63b31e | 2518 | |
77248221 SR |
2519 | return ret; |
2520 | } | |
2521 | ||
2522 | /* | |
2523 | * The top trace array already had its file descriptors created. | |
2524 | * Now the files themselves need to be created. | |
2525 | */ | |
2526 | static __init int | |
2527 | early_event_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2528 | { | |
2529 | int ret; | |
2530 | ||
2531 | mutex_lock(&event_mutex); | |
2532 | ||
2533 | ret = create_event_toplevel_files(parent, tr); | |
2534 | if (ret) | |
2535 | goto out_unlock; | |
2536 | ||
52f6ad6d | 2537 | down_write(&trace_event_sem); |
77248221 | 2538 | __trace_early_add_event_dirs(tr); |
52f6ad6d | 2539 | up_write(&trace_event_sem); |
77248221 SR |
2540 | |
2541 | out_unlock: | |
2542 | mutex_unlock(&event_mutex); | |
2543 | ||
2544 | return ret; | |
ae63b31e SR |
2545 | } |
2546 | ||
0c8916c3 SR |
2547 | int event_trace_del_tracer(struct trace_array *tr) |
2548 | { | |
0c8916c3 SR |
2549 | mutex_lock(&event_mutex); |
2550 | ||
85f2b082 TZ |
2551 | /* Disable any event triggers and associated soft-disabled events */ |
2552 | clear_event_triggers(tr); | |
2553 | ||
2a6c24af SRRH |
2554 | /* Disable any running events */ |
2555 | __ftrace_set_clr_event_nolock(tr, NULL, NULL, NULL, 0); | |
2556 | ||
3ccb0123 SR |
2557 | /* Access to events are within rcu_read_lock_sched() */ |
2558 | synchronize_sched(); | |
2559 | ||
52f6ad6d | 2560 | down_write(&trace_event_sem); |
0c8916c3 | 2561 | __trace_remove_event_dirs(tr); |
8434dc93 | 2562 | tracefs_remove_recursive(tr->event_dir); |
52f6ad6d | 2563 | up_write(&trace_event_sem); |
0c8916c3 SR |
2564 | |
2565 | tr->event_dir = NULL; | |
2566 | ||
2567 | mutex_unlock(&event_mutex); | |
2568 | ||
2569 | return 0; | |
2570 | } | |
2571 | ||
d1a29143 SR |
2572 | static __init int event_trace_memsetup(void) |
2573 | { | |
2574 | field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); | |
7f1d2f82 | 2575 | file_cachep = KMEM_CACHE(trace_event_file, SLAB_PANIC); |
d1a29143 SR |
2576 | return 0; |
2577 | } | |
2578 | ||
ce1039bd SRRH |
2579 | static __init void |
2580 | early_enable_events(struct trace_array *tr, bool disable_first) | |
2581 | { | |
2582 | char *buf = bootup_event_buf; | |
2583 | char *token; | |
2584 | int ret; | |
2585 | ||
2586 | while (true) { | |
2587 | token = strsep(&buf, ","); | |
2588 | ||
2589 | if (!token) | |
2590 | break; | |
2591 | if (!*token) | |
2592 | continue; | |
2593 | ||
2594 | /* Restarting syscalls requires that we stop them first */ | |
2595 | if (disable_first) | |
2596 | ftrace_set_clr_event(tr, token, 0); | |
2597 | ||
2598 | ret = ftrace_set_clr_event(tr, token, 1); | |
2599 | if (ret) | |
2600 | pr_warn("Failed to enable trace event: %s\n", token); | |
2601 | ||
2602 | /* Put back the comma to allow this to be called again */ | |
2603 | if (buf) | |
2604 | *(buf - 1) = ','; | |
2605 | } | |
2606 | } | |
2607 | ||
8781915a EG |
2608 | static __init int event_trace_enable(void) |
2609 | { | |
ae63b31e | 2610 | struct trace_array *tr = top_trace_array(); |
2425bcb9 | 2611 | struct trace_event_call **iter, *call; |
8781915a EG |
2612 | int ret; |
2613 | ||
dc81e5e3 YY |
2614 | if (!tr) |
2615 | return -ENODEV; | |
2616 | ||
8781915a EG |
2617 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { |
2618 | ||
2619 | call = *iter; | |
2620 | ret = event_init(call); | |
2621 | if (!ret) | |
2622 | list_add(&call->list, &ftrace_events); | |
2623 | } | |
2624 | ||
77248221 SR |
2625 | /* |
2626 | * We need the top trace array to have a working set of trace | |
2627 | * points at early init, before the debug files and directories | |
2628 | * are created. Create the file entries now, and attach them | |
2629 | * to the actual file dentries later. | |
2630 | */ | |
2631 | __trace_early_add_events(tr); | |
2632 | ||
ce1039bd | 2633 | early_enable_events(tr, false); |
81698831 SR |
2634 | |
2635 | trace_printk_start_comm(); | |
2636 | ||
3cd715de SRRH |
2637 | register_event_cmds(); |
2638 | ||
85f2b082 TZ |
2639 | register_trigger_cmds(); |
2640 | ||
8781915a EG |
2641 | return 0; |
2642 | } | |
2643 | ||
ce1039bd SRRH |
2644 | /* |
2645 | * event_trace_enable() is called from trace_event_init() first to | |
2646 | * initialize events and perhaps start any events that are on the | |
2647 | * command line. Unfortunately, there are some events that will not | |
2648 | * start this early, like the system call tracepoints that need | |
2649 | * to set the TIF_SYSCALL_TRACEPOINT flag of pid 1. But event_trace_enable() | |
2650 | * is called before pid 1 starts, and this flag is never set, making | |
2651 | * the syscall tracepoint never get reached, but the event is enabled | |
2652 | * regardless (and not doing anything). | |
2653 | */ | |
2654 | static __init int event_trace_enable_again(void) | |
2655 | { | |
2656 | struct trace_array *tr; | |
2657 | ||
2658 | tr = top_trace_array(); | |
2659 | if (!tr) | |
2660 | return -ENODEV; | |
2661 | ||
2662 | early_enable_events(tr, true); | |
2663 | ||
2664 | return 0; | |
2665 | } | |
2666 | ||
2667 | early_initcall(event_trace_enable_again); | |
2668 | ||
b77e38aa SR |
2669 | static __init int event_trace_init(void) |
2670 | { | |
ae63b31e | 2671 | struct trace_array *tr; |
b77e38aa SR |
2672 | struct dentry *d_tracer; |
2673 | struct dentry *entry; | |
6d723736 | 2674 | int ret; |
b77e38aa | 2675 | |
ae63b31e | 2676 | tr = top_trace_array(); |
dc81e5e3 YY |
2677 | if (!tr) |
2678 | return -ENODEV; | |
ae63b31e | 2679 | |
b77e38aa | 2680 | d_tracer = tracing_init_dentry(); |
14a5ae40 | 2681 | if (IS_ERR(d_tracer)) |
b77e38aa SR |
2682 | return 0; |
2683 | ||
8434dc93 | 2684 | entry = tracefs_create_file("available_events", 0444, d_tracer, |
ae63b31e | 2685 | tr, &ftrace_avail_fops); |
2314c4ae | 2686 | if (!entry) |
8434dc93 | 2687 | pr_warn("Could not create tracefs 'available_events' entry\n"); |
2314c4ae | 2688 | |
9f616680 DW |
2689 | if (trace_define_generic_fields()) |
2690 | pr_warn("tracing: Failed to allocated generic fields"); | |
2691 | ||
8728fe50 | 2692 | if (trace_define_common_fields()) |
3448bac3 | 2693 | pr_warn("tracing: Failed to allocate common fields"); |
8728fe50 | 2694 | |
77248221 | 2695 | ret = early_event_add_tracer(d_tracer, tr); |
ae63b31e SR |
2696 | if (ret) |
2697 | return ret; | |
020e5f85 | 2698 | |
836d481e | 2699 | #ifdef CONFIG_MODULES |
6d723736 | 2700 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 2701 | if (ret) |
3448bac3 | 2702 | pr_warn("Failed to register trace events module notifier\n"); |
836d481e | 2703 | #endif |
b77e38aa SR |
2704 | return 0; |
2705 | } | |
5f893b26 SRRH |
2706 | |
2707 | void __init trace_event_init(void) | |
2708 | { | |
2709 | event_trace_memsetup(); | |
2710 | init_ftrace_syscalls(); | |
2711 | event_trace_enable(); | |
2712 | } | |
2713 | ||
b77e38aa | 2714 | fs_initcall(event_trace_init); |
e6187007 SR |
2715 | |
2716 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
2717 | ||
2718 | static DEFINE_SPINLOCK(test_spinlock); | |
2719 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
2720 | static DEFINE_MUTEX(test_mutex); | |
2721 | ||
2722 | static __init void test_work(struct work_struct *dummy) | |
2723 | { | |
2724 | spin_lock(&test_spinlock); | |
2725 | spin_lock_irq(&test_spinlock_irq); | |
2726 | udelay(1); | |
2727 | spin_unlock_irq(&test_spinlock_irq); | |
2728 | spin_unlock(&test_spinlock); | |
2729 | ||
2730 | mutex_lock(&test_mutex); | |
2731 | msleep(1); | |
2732 | mutex_unlock(&test_mutex); | |
2733 | } | |
2734 | ||
2735 | static __init int event_test_thread(void *unused) | |
2736 | { | |
2737 | void *test_malloc; | |
2738 | ||
2739 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
2740 | if (!test_malloc) | |
2741 | pr_info("failed to kmalloc\n"); | |
2742 | ||
2743 | schedule_on_each_cpu(test_work); | |
2744 | ||
2745 | kfree(test_malloc); | |
2746 | ||
2747 | set_current_state(TASK_INTERRUPTIBLE); | |
fe0e01c7 | 2748 | while (!kthread_should_stop()) { |
e6187007 | 2749 | schedule(); |
fe0e01c7 PZ |
2750 | set_current_state(TASK_INTERRUPTIBLE); |
2751 | } | |
2752 | __set_current_state(TASK_RUNNING); | |
e6187007 SR |
2753 | |
2754 | return 0; | |
2755 | } | |
2756 | ||
2757 | /* | |
2758 | * Do various things that may trigger events. | |
2759 | */ | |
2760 | static __init void event_test_stuff(void) | |
2761 | { | |
2762 | struct task_struct *test_thread; | |
2763 | ||
2764 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
2765 | msleep(1); | |
2766 | kthread_stop(test_thread); | |
2767 | } | |
2768 | ||
2769 | /* | |
2770 | * For every trace event defined, we will test each trace point separately, | |
2771 | * and then by groups, and finally all trace points. | |
2772 | */ | |
9ea21c1e | 2773 | static __init void event_trace_self_tests(void) |
e6187007 | 2774 | { |
7967b3e0 | 2775 | struct trace_subsystem_dir *dir; |
7f1d2f82 | 2776 | struct trace_event_file *file; |
2425bcb9 | 2777 | struct trace_event_call *call; |
e6187007 | 2778 | struct event_subsystem *system; |
ae63b31e | 2779 | struct trace_array *tr; |
e6187007 SR |
2780 | int ret; |
2781 | ||
ae63b31e | 2782 | tr = top_trace_array(); |
dc81e5e3 YY |
2783 | if (!tr) |
2784 | return; | |
ae63b31e | 2785 | |
e6187007 SR |
2786 | pr_info("Running tests on trace events:\n"); |
2787 | ||
ae63b31e SR |
2788 | list_for_each_entry(file, &tr->events, list) { |
2789 | ||
2790 | call = file->event_call; | |
e6187007 | 2791 | |
2239291a SR |
2792 | /* Only test those that have a probe */ |
2793 | if (!call->class || !call->class->probe) | |
e6187007 SR |
2794 | continue; |
2795 | ||
1f5a6b45 SR |
2796 | /* |
2797 | * Testing syscall events here is pretty useless, but | |
2798 | * we still do it if configured. But this is time consuming. | |
2799 | * What we really need is a user thread to perform the | |
2800 | * syscalls as we test. | |
2801 | */ | |
2802 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
2803 | if (call->class->system && |
2804 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
2805 | continue; |
2806 | #endif | |
2807 | ||
687fcc4a | 2808 | pr_info("Testing event %s: ", trace_event_name(call)); |
e6187007 SR |
2809 | |
2810 | /* | |
2811 | * If an event is already enabled, someone is using | |
2812 | * it and the self test should not be on. | |
2813 | */ | |
5d6ad960 | 2814 | if (file->flags & EVENT_FILE_FL_ENABLED) { |
3448bac3 | 2815 | pr_warn("Enabled event during self test!\n"); |
e6187007 SR |
2816 | WARN_ON_ONCE(1); |
2817 | continue; | |
2818 | } | |
2819 | ||
ae63b31e | 2820 | ftrace_event_enable_disable(file, 1); |
e6187007 | 2821 | event_test_stuff(); |
ae63b31e | 2822 | ftrace_event_enable_disable(file, 0); |
e6187007 SR |
2823 | |
2824 | pr_cont("OK\n"); | |
2825 | } | |
2826 | ||
2827 | /* Now test at the sub system level */ | |
2828 | ||
2829 | pr_info("Running tests on trace event systems:\n"); | |
2830 | ||
ae63b31e SR |
2831 | list_for_each_entry(dir, &tr->systems, list) { |
2832 | ||
2833 | system = dir->subsystem; | |
e6187007 SR |
2834 | |
2835 | /* the ftrace system is special, skip it */ | |
2836 | if (strcmp(system->name, "ftrace") == 0) | |
2837 | continue; | |
2838 | ||
2839 | pr_info("Testing event system %s: ", system->name); | |
2840 | ||
ae63b31e | 2841 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
e6187007 | 2842 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
2843 | pr_warn("error enabling system %s\n", |
2844 | system->name); | |
e6187007 SR |
2845 | continue; |
2846 | } | |
2847 | ||
2848 | event_test_stuff(); | |
2849 | ||
ae63b31e | 2850 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
76bab1b7 | 2851 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
2852 | pr_warn("error disabling system %s\n", |
2853 | system->name); | |
76bab1b7 YL |
2854 | continue; |
2855 | } | |
e6187007 SR |
2856 | |
2857 | pr_cont("OK\n"); | |
2858 | } | |
2859 | ||
2860 | /* Test with all events enabled */ | |
2861 | ||
2862 | pr_info("Running tests on all trace events:\n"); | |
2863 | pr_info("Testing all events: "); | |
2864 | ||
ae63b31e | 2865 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
e6187007 | 2866 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 2867 | pr_warn("error enabling all events\n"); |
9ea21c1e | 2868 | return; |
e6187007 SR |
2869 | } |
2870 | ||
2871 | event_test_stuff(); | |
2872 | ||
2873 | /* reset sysname */ | |
ae63b31e | 2874 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
e6187007 | 2875 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 2876 | pr_warn("error disabling all events\n"); |
9ea21c1e | 2877 | return; |
e6187007 SR |
2878 | } |
2879 | ||
2880 | pr_cont("OK\n"); | |
9ea21c1e SR |
2881 | } |
2882 | ||
2883 | #ifdef CONFIG_FUNCTION_TRACER | |
2884 | ||
245b2e70 | 2885 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e | 2886 | |
b7f0c959 SRRH |
2887 | static struct trace_array *event_tr; |
2888 | ||
2889 | static void __init | |
2f5f6ad9 | 2890 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 2891 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
9ea21c1e SR |
2892 | { |
2893 | struct ring_buffer_event *event; | |
e77405ad | 2894 | struct ring_buffer *buffer; |
9ea21c1e SR |
2895 | struct ftrace_entry *entry; |
2896 | unsigned long flags; | |
2897 | long disabled; | |
9ea21c1e SR |
2898 | int cpu; |
2899 | int pc; | |
2900 | ||
2901 | pc = preempt_count(); | |
5168ae50 | 2902 | preempt_disable_notrace(); |
9ea21c1e | 2903 | cpu = raw_smp_processor_id(); |
245b2e70 | 2904 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
2905 | |
2906 | if (disabled != 1) | |
2907 | goto out; | |
2908 | ||
2909 | local_save_flags(flags); | |
2910 | ||
e77405ad SR |
2911 | event = trace_current_buffer_lock_reserve(&buffer, |
2912 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
2913 | flags, pc); |
2914 | if (!event) | |
2915 | goto out; | |
2916 | entry = ring_buffer_event_data(event); | |
2917 | entry->ip = ip; | |
2918 | entry->parent_ip = parent_ip; | |
2919 | ||
b7f0c959 | 2920 | trace_buffer_unlock_commit(event_tr, buffer, event, flags, pc); |
9ea21c1e SR |
2921 | |
2922 | out: | |
245b2e70 | 2923 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 2924 | preempt_enable_notrace(); |
9ea21c1e SR |
2925 | } |
2926 | ||
2927 | static struct ftrace_ops trace_ops __initdata = | |
2928 | { | |
2929 | .func = function_test_events_call, | |
4740974a | 2930 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
9ea21c1e SR |
2931 | }; |
2932 | ||
2933 | static __init void event_trace_self_test_with_function(void) | |
2934 | { | |
17bb615a | 2935 | int ret; |
2d34f489 SRRH |
2936 | event_tr = top_trace_array(); |
2937 | if (WARN_ON(!event_tr)) | |
2938 | return; | |
17bb615a SR |
2939 | ret = register_ftrace_function(&trace_ops); |
2940 | if (WARN_ON(ret < 0)) { | |
2941 | pr_info("Failed to enable function tracer for event tests\n"); | |
2942 | return; | |
2943 | } | |
9ea21c1e SR |
2944 | pr_info("Running tests again, along with the function tracer\n"); |
2945 | event_trace_self_tests(); | |
2946 | unregister_ftrace_function(&trace_ops); | |
2947 | } | |
2948 | #else | |
2949 | static __init void event_trace_self_test_with_function(void) | |
2950 | { | |
2951 | } | |
2952 | #endif | |
2953 | ||
2954 | static __init int event_trace_self_tests_init(void) | |
2955 | { | |
020e5f85 LZ |
2956 | if (!tracing_selftest_disabled) { |
2957 | event_trace_self_tests(); | |
2958 | event_trace_self_test_with_function(); | |
2959 | } | |
e6187007 SR |
2960 | |
2961 | return 0; | |
2962 | } | |
2963 | ||
28d20e2d | 2964 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
2965 | |
2966 | #endif |