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 | #define SYSTEM_FL_FREE_NAME (1 << 31) |
42 | ||
43 | static inline int system_refcount(struct event_subsystem *system) | |
44 | { | |
45 | return system->ref_count & ~SYSTEM_FL_FREE_NAME; | |
46 | } | |
47 | ||
48 | static int system_refcount_inc(struct event_subsystem *system) | |
49 | { | |
50 | return (system->ref_count++) & ~SYSTEM_FL_FREE_NAME; | |
51 | } | |
52 | ||
53 | static int system_refcount_dec(struct event_subsystem *system) | |
54 | { | |
55 | return (--system->ref_count) & ~SYSTEM_FL_FREE_NAME; | |
56 | } | |
57 | ||
ae63b31e SR |
58 | /* Double loops, do not use break, only goto's work */ |
59 | #define do_for_each_event_file(tr, file) \ | |
60 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
61 | list_for_each_entry(file, &tr->events, list) | |
62 | ||
63 | #define do_for_each_event_file_safe(tr, file) \ | |
64 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
7f1d2f82 | 65 | struct trace_event_file *___n; \ |
ae63b31e SR |
66 | list_for_each_entry_safe(file, ___n, &tr->events, list) |
67 | ||
68 | #define while_for_each_event_file() \ | |
69 | } | |
70 | ||
b3a8c6fd | 71 | static struct list_head * |
2425bcb9 | 72 | trace_get_fields(struct trace_event_call *event_call) |
2e33af02 SR |
73 | { |
74 | if (!event_call->class->get_fields) | |
75 | return &event_call->class->fields; | |
76 | return event_call->class->get_fields(event_call); | |
77 | } | |
78 | ||
b3a8c6fd J |
79 | static struct ftrace_event_field * |
80 | __find_event_field(struct list_head *head, char *name) | |
81 | { | |
82 | struct ftrace_event_field *field; | |
83 | ||
84 | list_for_each_entry(field, head, link) { | |
85 | if (!strcmp(field->name, name)) | |
86 | return field; | |
87 | } | |
88 | ||
89 | return NULL; | |
90 | } | |
91 | ||
92 | struct ftrace_event_field * | |
2425bcb9 | 93 | trace_find_event_field(struct trace_event_call *call, char *name) |
b3a8c6fd J |
94 | { |
95 | struct ftrace_event_field *field; | |
96 | struct list_head *head; | |
97 | ||
9f616680 DW |
98 | field = __find_event_field(&ftrace_generic_fields, name); |
99 | if (field) | |
100 | return field; | |
101 | ||
b3a8c6fd J |
102 | field = __find_event_field(&ftrace_common_fields, name); |
103 | if (field) | |
104 | return field; | |
105 | ||
106 | head = trace_get_fields(call); | |
107 | return __find_event_field(head, name); | |
108 | } | |
109 | ||
8728fe50 LZ |
110 | static int __trace_define_field(struct list_head *head, const char *type, |
111 | const char *name, int offset, int size, | |
112 | int is_signed, int filter_type) | |
cf027f64 TZ |
113 | { |
114 | struct ftrace_event_field *field; | |
115 | ||
d1a29143 | 116 | field = kmem_cache_alloc(field_cachep, GFP_TRACE); |
cf027f64 | 117 | if (!field) |
aaf6ac0f | 118 | return -ENOMEM; |
fe9f57f2 | 119 | |
92edca07 SR |
120 | field->name = name; |
121 | field->type = type; | |
fe9f57f2 | 122 | |
43b51ead LZ |
123 | if (filter_type == FILTER_OTHER) |
124 | field->filter_type = filter_assign_type(type); | |
125 | else | |
126 | field->filter_type = filter_type; | |
127 | ||
cf027f64 TZ |
128 | field->offset = offset; |
129 | field->size = size; | |
a118e4d1 | 130 | field->is_signed = is_signed; |
aa38e9fc | 131 | |
2e33af02 | 132 | list_add(&field->link, head); |
cf027f64 TZ |
133 | |
134 | return 0; | |
cf027f64 | 135 | } |
8728fe50 | 136 | |
2425bcb9 | 137 | int trace_define_field(struct trace_event_call *call, const char *type, |
8728fe50 LZ |
138 | const char *name, int offset, int size, int is_signed, |
139 | int filter_type) | |
140 | { | |
141 | struct list_head *head; | |
142 | ||
143 | if (WARN_ON(!call->class)) | |
144 | return 0; | |
145 | ||
146 | head = trace_get_fields(call); | |
147 | return __trace_define_field(head, type, name, offset, size, | |
148 | is_signed, filter_type); | |
149 | } | |
17c873ec | 150 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 151 | |
9f616680 DW |
152 | #define __generic_field(type, item, filter_type) \ |
153 | ret = __trace_define_field(&ftrace_generic_fields, #type, \ | |
154 | #item, 0, 0, is_signed_type(type), \ | |
155 | filter_type); \ | |
156 | if (ret) \ | |
157 | return ret; | |
158 | ||
e647d6b3 | 159 | #define __common_field(type, item) \ |
8728fe50 LZ |
160 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
161 | "common_" #item, \ | |
162 | offsetof(typeof(ent), item), \ | |
163 | sizeof(ent.item), \ | |
164 | is_signed_type(type), FILTER_OTHER); \ | |
e647d6b3 LZ |
165 | if (ret) \ |
166 | return ret; | |
167 | ||
9f616680 DW |
168 | static int trace_define_generic_fields(void) |
169 | { | |
170 | int ret; | |
171 | ||
172 | __generic_field(int, cpu, FILTER_OTHER); | |
173 | __generic_field(char *, comm, FILTER_PTR_STRING); | |
174 | ||
175 | return ret; | |
176 | } | |
177 | ||
8728fe50 | 178 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
179 | { |
180 | int ret; | |
181 | struct trace_entry ent; | |
182 | ||
183 | __common_field(unsigned short, type); | |
184 | __common_field(unsigned char, flags); | |
185 | __common_field(unsigned char, preempt_count); | |
186 | __common_field(int, pid); | |
e647d6b3 LZ |
187 | |
188 | return ret; | |
189 | } | |
190 | ||
2425bcb9 | 191 | static void trace_destroy_fields(struct trace_event_call *call) |
2df75e41 LZ |
192 | { |
193 | struct ftrace_event_field *field, *next; | |
2e33af02 | 194 | struct list_head *head; |
2df75e41 | 195 | |
2e33af02 SR |
196 | head = trace_get_fields(call); |
197 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 | 198 | list_del(&field->link); |
d1a29143 | 199 | kmem_cache_free(field_cachep, field); |
2df75e41 LZ |
200 | } |
201 | } | |
202 | ||
2425bcb9 | 203 | int trace_event_raw_init(struct trace_event_call *call) |
87d9b4e1 LZ |
204 | { |
205 | int id; | |
206 | ||
9023c930 | 207 | id = register_trace_event(&call->event); |
87d9b4e1 LZ |
208 | if (!id) |
209 | return -ENODEV; | |
87d9b4e1 LZ |
210 | |
211 | return 0; | |
212 | } | |
213 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
214 | ||
3f795dcf SRRH |
215 | void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer, |
216 | struct trace_event_file *trace_file, | |
217 | unsigned long len) | |
3fd40d1e | 218 | { |
2425bcb9 | 219 | struct trace_event_call *event_call = trace_file->event_call; |
3fd40d1e SR |
220 | |
221 | local_save_flags(fbuffer->flags); | |
222 | fbuffer->pc = preempt_count(); | |
7f1d2f82 | 223 | fbuffer->trace_file = trace_file; |
3fd40d1e SR |
224 | |
225 | fbuffer->event = | |
7f1d2f82 | 226 | trace_event_buffer_lock_reserve(&fbuffer->buffer, trace_file, |
3fd40d1e SR |
227 | event_call->event.type, len, |
228 | fbuffer->flags, fbuffer->pc); | |
229 | if (!fbuffer->event) | |
230 | return NULL; | |
231 | ||
232 | fbuffer->entry = ring_buffer_event_data(fbuffer->event); | |
233 | return fbuffer->entry; | |
234 | } | |
3f795dcf | 235 | EXPORT_SYMBOL_GPL(trace_event_buffer_reserve); |
3fd40d1e | 236 | |
0daa2302 SRRH |
237 | static DEFINE_SPINLOCK(tracepoint_iter_lock); |
238 | ||
3f795dcf | 239 | static void output_printk(struct trace_event_buffer *fbuffer) |
0daa2302 | 240 | { |
2425bcb9 | 241 | struct trace_event_call *event_call; |
0daa2302 SRRH |
242 | struct trace_event *event; |
243 | unsigned long flags; | |
244 | struct trace_iterator *iter = tracepoint_print_iter; | |
245 | ||
246 | if (!iter) | |
247 | return; | |
248 | ||
7f1d2f82 | 249 | event_call = fbuffer->trace_file->event_call; |
0daa2302 SRRH |
250 | if (!event_call || !event_call->event.funcs || |
251 | !event_call->event.funcs->trace) | |
252 | return; | |
253 | ||
7f1d2f82 | 254 | event = &fbuffer->trace_file->event_call->event; |
0daa2302 SRRH |
255 | |
256 | spin_lock_irqsave(&tracepoint_iter_lock, flags); | |
257 | trace_seq_init(&iter->seq); | |
258 | iter->ent = fbuffer->entry; | |
259 | event_call->event.funcs->trace(iter, 0, event); | |
260 | trace_seq_putc(&iter->seq, 0); | |
261 | printk("%s", iter->seq.buffer); | |
262 | ||
263 | spin_unlock_irqrestore(&tracepoint_iter_lock, flags); | |
264 | } | |
265 | ||
3f795dcf | 266 | void trace_event_buffer_commit(struct trace_event_buffer *fbuffer) |
3fd40d1e | 267 | { |
0daa2302 SRRH |
268 | if (tracepoint_printk) |
269 | output_printk(fbuffer); | |
270 | ||
7f1d2f82 | 271 | event_trigger_unlock_commit(fbuffer->trace_file, fbuffer->buffer, |
3fd40d1e SR |
272 | fbuffer->event, fbuffer->entry, |
273 | fbuffer->flags, fbuffer->pc); | |
274 | } | |
3f795dcf | 275 | EXPORT_SYMBOL_GPL(trace_event_buffer_commit); |
3fd40d1e | 276 | |
2425bcb9 | 277 | int trace_event_reg(struct trace_event_call *call, |
9023c930 | 278 | enum trace_reg type, void *data) |
a1d0ce82 | 279 | { |
7f1d2f82 | 280 | struct trace_event_file *file = data; |
ae63b31e | 281 | |
de7b2973 | 282 | WARN_ON(!(call->flags & TRACE_EVENT_FL_TRACEPOINT)); |
a1d0ce82 SR |
283 | switch (type) { |
284 | case TRACE_REG_REGISTER: | |
de7b2973 | 285 | return tracepoint_probe_register(call->tp, |
a1d0ce82 | 286 | call->class->probe, |
ae63b31e | 287 | file); |
a1d0ce82 | 288 | case TRACE_REG_UNREGISTER: |
de7b2973 | 289 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 | 290 | call->class->probe, |
ae63b31e | 291 | file); |
a1d0ce82 SR |
292 | return 0; |
293 | ||
294 | #ifdef CONFIG_PERF_EVENTS | |
295 | case TRACE_REG_PERF_REGISTER: | |
de7b2973 | 296 | return tracepoint_probe_register(call->tp, |
a1d0ce82 SR |
297 | call->class->perf_probe, |
298 | call); | |
299 | case TRACE_REG_PERF_UNREGISTER: | |
de7b2973 | 300 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 SR |
301 | call->class->perf_probe, |
302 | call); | |
303 | return 0; | |
ceec0b6f JO |
304 | case TRACE_REG_PERF_OPEN: |
305 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
306 | case TRACE_REG_PERF_ADD: |
307 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 308 | return 0; |
a1d0ce82 SR |
309 | #endif |
310 | } | |
311 | return 0; | |
312 | } | |
9023c930 | 313 | EXPORT_SYMBOL_GPL(trace_event_reg); |
a1d0ce82 | 314 | |
e870e9a1 LZ |
315 | void trace_event_enable_cmd_record(bool enable) |
316 | { | |
7f1d2f82 | 317 | struct trace_event_file *file; |
ae63b31e | 318 | struct trace_array *tr; |
e870e9a1 LZ |
319 | |
320 | mutex_lock(&event_mutex); | |
ae63b31e SR |
321 | do_for_each_event_file(tr, file) { |
322 | ||
5d6ad960 | 323 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) |
e870e9a1 LZ |
324 | continue; |
325 | ||
326 | if (enable) { | |
327 | tracing_start_cmdline_record(); | |
5d6ad960 | 328 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 LZ |
329 | } else { |
330 | tracing_stop_cmdline_record(); | |
5d6ad960 | 331 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 332 | } |
ae63b31e | 333 | } while_for_each_event_file(); |
e870e9a1 LZ |
334 | mutex_unlock(&event_mutex); |
335 | } | |
336 | ||
7f1d2f82 | 337 | static int __ftrace_event_enable_disable(struct trace_event_file *file, |
417944c4 | 338 | int enable, int soft_disable) |
fd994989 | 339 | { |
2425bcb9 | 340 | struct trace_event_call *call = file->event_call; |
3b8e4273 | 341 | int ret = 0; |
417944c4 | 342 | int disable; |
3b8e4273 | 343 | |
fd994989 SR |
344 | switch (enable) { |
345 | case 0: | |
417944c4 | 346 | /* |
1cf4c073 MH |
347 | * When soft_disable is set and enable is cleared, the sm_ref |
348 | * reference counter is decremented. If it reaches 0, we want | |
417944c4 SRRH |
349 | * to clear the SOFT_DISABLED flag but leave the event in the |
350 | * state that it was. That is, if the event was enabled and | |
351 | * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED | |
352 | * is set we do not want the event to be enabled before we | |
353 | * clear the bit. | |
354 | * | |
355 | * When soft_disable is not set but the SOFT_MODE flag is, | |
356 | * we do nothing. Do not disable the tracepoint, otherwise | |
357 | * "soft enable"s (clearing the SOFT_DISABLED bit) wont work. | |
358 | */ | |
359 | if (soft_disable) { | |
1cf4c073 MH |
360 | if (atomic_dec_return(&file->sm_ref) > 0) |
361 | break; | |
5d6ad960 SRRH |
362 | disable = file->flags & EVENT_FILE_FL_SOFT_DISABLED; |
363 | clear_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); | |
417944c4 | 364 | } else |
5d6ad960 | 365 | disable = !(file->flags & EVENT_FILE_FL_SOFT_MODE); |
417944c4 | 366 | |
5d6ad960 SRRH |
367 | if (disable && (file->flags & EVENT_FILE_FL_ENABLED)) { |
368 | clear_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); | |
369 | if (file->flags & EVENT_FILE_FL_RECORDED_CMD) { | |
e870e9a1 | 370 | tracing_stop_cmdline_record(); |
5d6ad960 | 371 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 372 | } |
ae63b31e | 373 | call->class->reg(call, TRACE_REG_UNREGISTER, file); |
fd994989 | 374 | } |
3baa5e4c | 375 | /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT, else clear it */ |
5d6ad960 SRRH |
376 | if (file->flags & EVENT_FILE_FL_SOFT_MODE) |
377 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); | |
3baa5e4c | 378 | else |
5d6ad960 | 379 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
fd994989 SR |
380 | break; |
381 | case 1: | |
417944c4 SRRH |
382 | /* |
383 | * When soft_disable is set and enable is set, we want to | |
384 | * register the tracepoint for the event, but leave the event | |
385 | * as is. That means, if the event was already enabled, we do | |
386 | * nothing (but set SOFT_MODE). If the event is disabled, we | |
387 | * set SOFT_DISABLED before enabling the event tracepoint, so | |
388 | * it still seems to be disabled. | |
389 | */ | |
390 | if (!soft_disable) | |
5d6ad960 | 391 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
1cf4c073 MH |
392 | else { |
393 | if (atomic_inc_return(&file->sm_ref) > 1) | |
394 | break; | |
5d6ad960 | 395 | set_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); |
1cf4c073 | 396 | } |
417944c4 | 397 | |
5d6ad960 | 398 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) { |
417944c4 SRRH |
399 | |
400 | /* Keep the event disabled, when going to SOFT_MODE. */ | |
401 | if (soft_disable) | |
5d6ad960 | 402 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
417944c4 | 403 | |
e870e9a1 LZ |
404 | if (trace_flags & TRACE_ITER_RECORD_CMD) { |
405 | tracing_start_cmdline_record(); | |
5d6ad960 | 406 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 407 | } |
ae63b31e | 408 | ret = call->class->reg(call, TRACE_REG_REGISTER, file); |
3b8e4273 LZ |
409 | if (ret) { |
410 | tracing_stop_cmdline_record(); | |
411 | pr_info("event trace: Could not enable event " | |
687fcc4a | 412 | "%s\n", trace_event_name(call)); |
3b8e4273 LZ |
413 | break; |
414 | } | |
5d6ad960 | 415 | set_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); |
575380da SRRH |
416 | |
417 | /* WAS_ENABLED gets set but never cleared. */ | |
418 | call->flags |= TRACE_EVENT_FL_WAS_ENABLED; | |
fd994989 | 419 | } |
fd994989 SR |
420 | break; |
421 | } | |
3b8e4273 LZ |
422 | |
423 | return ret; | |
fd994989 SR |
424 | } |
425 | ||
7f1d2f82 | 426 | int trace_event_enable_disable(struct trace_event_file *file, |
85f2b082 TZ |
427 | int enable, int soft_disable) |
428 | { | |
429 | return __ftrace_event_enable_disable(file, enable, soft_disable); | |
430 | } | |
431 | ||
7f1d2f82 | 432 | static int ftrace_event_enable_disable(struct trace_event_file *file, |
417944c4 SRRH |
433 | int enable) |
434 | { | |
435 | return __ftrace_event_enable_disable(file, enable, 0); | |
436 | } | |
437 | ||
ae63b31e | 438 | static void ftrace_clear_events(struct trace_array *tr) |
0e907c99 | 439 | { |
7f1d2f82 | 440 | struct trace_event_file *file; |
0e907c99 Z |
441 | |
442 | mutex_lock(&event_mutex); | |
ae63b31e SR |
443 | list_for_each_entry(file, &tr->events, list) { |
444 | ftrace_event_enable_disable(file, 0); | |
0e907c99 Z |
445 | } |
446 | mutex_unlock(&event_mutex); | |
447 | } | |
448 | ||
e9dbfae5 SR |
449 | static void __put_system(struct event_subsystem *system) |
450 | { | |
451 | struct event_filter *filter = system->filter; | |
452 | ||
6e94a780 SR |
453 | WARN_ON_ONCE(system_refcount(system) == 0); |
454 | if (system_refcount_dec(system)) | |
e9dbfae5 SR |
455 | return; |
456 | ||
ae63b31e SR |
457 | list_del(&system->list); |
458 | ||
e9dbfae5 SR |
459 | if (filter) { |
460 | kfree(filter->filter_string); | |
461 | kfree(filter); | |
462 | } | |
6e94a780 SR |
463 | if (system->ref_count & SYSTEM_FL_FREE_NAME) |
464 | kfree(system->name); | |
e9dbfae5 SR |
465 | kfree(system); |
466 | } | |
467 | ||
468 | static void __get_system(struct event_subsystem *system) | |
469 | { | |
6e94a780 SR |
470 | WARN_ON_ONCE(system_refcount(system) == 0); |
471 | system_refcount_inc(system); | |
e9dbfae5 SR |
472 | } |
473 | ||
7967b3e0 | 474 | static void __get_system_dir(struct trace_subsystem_dir *dir) |
ae63b31e SR |
475 | { |
476 | WARN_ON_ONCE(dir->ref_count == 0); | |
477 | dir->ref_count++; | |
478 | __get_system(dir->subsystem); | |
479 | } | |
480 | ||
7967b3e0 | 481 | static void __put_system_dir(struct trace_subsystem_dir *dir) |
ae63b31e SR |
482 | { |
483 | WARN_ON_ONCE(dir->ref_count == 0); | |
484 | /* If the subsystem is about to be freed, the dir must be too */ | |
6e94a780 | 485 | WARN_ON_ONCE(system_refcount(dir->subsystem) == 1 && dir->ref_count != 1); |
ae63b31e SR |
486 | |
487 | __put_system(dir->subsystem); | |
488 | if (!--dir->ref_count) | |
489 | kfree(dir); | |
490 | } | |
491 | ||
7967b3e0 | 492 | static void put_system(struct trace_subsystem_dir *dir) |
e9dbfae5 SR |
493 | { |
494 | mutex_lock(&event_mutex); | |
ae63b31e | 495 | __put_system_dir(dir); |
e9dbfae5 SR |
496 | mutex_unlock(&event_mutex); |
497 | } | |
498 | ||
7967b3e0 | 499 | static void remove_subsystem(struct trace_subsystem_dir *dir) |
f6a84bdc ON |
500 | { |
501 | if (!dir) | |
502 | return; | |
503 | ||
504 | if (!--dir->nr_events) { | |
8434dc93 | 505 | tracefs_remove_recursive(dir->entry); |
f6a84bdc ON |
506 | list_del(&dir->list); |
507 | __put_system_dir(dir); | |
508 | } | |
509 | } | |
510 | ||
7f1d2f82 | 511 | static void remove_event_file_dir(struct trace_event_file *file) |
f6a84bdc | 512 | { |
bf682c31 ON |
513 | struct dentry *dir = file->dir; |
514 | struct dentry *child; | |
515 | ||
516 | if (dir) { | |
517 | spin_lock(&dir->d_lock); /* probably unneeded */ | |
946e51f2 | 518 | list_for_each_entry(child, &dir->d_subdirs, d_child) { |
7682c918 DH |
519 | if (d_really_is_positive(child)) /* probably unneeded */ |
520 | d_inode(child)->i_private = NULL; | |
bf682c31 ON |
521 | } |
522 | spin_unlock(&dir->d_lock); | |
523 | ||
8434dc93 | 524 | tracefs_remove_recursive(dir); |
bf682c31 ON |
525 | } |
526 | ||
f6a84bdc | 527 | list_del(&file->list); |
f6a84bdc | 528 | remove_subsystem(file->system); |
2448e349 | 529 | free_event_filter(file->filter); |
f6a84bdc ON |
530 | kmem_cache_free(file_cachep, file); |
531 | } | |
532 | ||
8f31bfe5 LZ |
533 | /* |
534 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
535 | */ | |
2a6c24af SRRH |
536 | static int |
537 | __ftrace_set_clr_event_nolock(struct trace_array *tr, const char *match, | |
538 | const char *sub, const char *event, int set) | |
b77e38aa | 539 | { |
7f1d2f82 | 540 | struct trace_event_file *file; |
2425bcb9 | 541 | struct trace_event_call *call; |
de7b2973 | 542 | const char *name; |
29f93943 | 543 | int ret = -EINVAL; |
8f31bfe5 | 544 | |
ae63b31e SR |
545 | list_for_each_entry(file, &tr->events, list) { |
546 | ||
547 | call = file->event_call; | |
687fcc4a | 548 | name = trace_event_name(call); |
8f31bfe5 | 549 | |
de7b2973 | 550 | if (!name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
551 | continue; |
552 | ||
9b63776f SR |
553 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
554 | continue; | |
555 | ||
8f31bfe5 | 556 | if (match && |
de7b2973 | 557 | strcmp(match, name) != 0 && |
8f082018 | 558 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
559 | continue; |
560 | ||
8f082018 | 561 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
562 | continue; |
563 | ||
de7b2973 | 564 | if (event && strcmp(event, name) != 0) |
8f31bfe5 LZ |
565 | continue; |
566 | ||
ae63b31e | 567 | ftrace_event_enable_disable(file, set); |
8f31bfe5 LZ |
568 | |
569 | ret = 0; | |
570 | } | |
2a6c24af SRRH |
571 | |
572 | return ret; | |
573 | } | |
574 | ||
575 | static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, | |
576 | const char *sub, const char *event, int set) | |
577 | { | |
578 | int ret; | |
579 | ||
580 | mutex_lock(&event_mutex); | |
581 | ret = __ftrace_set_clr_event_nolock(tr, match, sub, event, set); | |
8f31bfe5 LZ |
582 | mutex_unlock(&event_mutex); |
583 | ||
584 | return ret; | |
585 | } | |
586 | ||
ae63b31e | 587 | static int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set) |
8f31bfe5 | 588 | { |
b628b3e6 | 589 | char *event = NULL, *sub = NULL, *match; |
84fce9db | 590 | int ret; |
b628b3e6 SR |
591 | |
592 | /* | |
593 | * The buf format can be <subsystem>:<event-name> | |
594 | * *:<event-name> means any event by that name. | |
595 | * :<event-name> is the same. | |
596 | * | |
597 | * <subsystem>:* means all events in that subsystem | |
598 | * <subsystem>: means the same. | |
599 | * | |
600 | * <name> (no ':') means all events in a subsystem with | |
601 | * the name <name> or any event that matches <name> | |
602 | */ | |
603 | ||
604 | match = strsep(&buf, ":"); | |
605 | if (buf) { | |
606 | sub = match; | |
607 | event = buf; | |
608 | match = NULL; | |
609 | ||
610 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
611 | sub = NULL; | |
612 | if (!strlen(event) || strcmp(event, "*") == 0) | |
613 | event = NULL; | |
614 | } | |
b77e38aa | 615 | |
84fce9db JK |
616 | ret = __ftrace_set_clr_event(tr, match, sub, event, set); |
617 | ||
618 | /* Put back the colon to allow this to be called again */ | |
619 | if (buf) | |
620 | *(buf - 1) = ':'; | |
621 | ||
622 | return ret; | |
b77e38aa SR |
623 | } |
624 | ||
4671c794 SR |
625 | /** |
626 | * trace_set_clr_event - enable or disable an event | |
627 | * @system: system name to match (NULL for any system) | |
628 | * @event: event name to match (NULL for all events, within system) | |
629 | * @set: 1 to enable, 0 to disable | |
630 | * | |
631 | * This is a way for other parts of the kernel to enable or disable | |
632 | * event recording. | |
633 | * | |
634 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
635 | * registered events. | |
636 | */ | |
637 | int trace_set_clr_event(const char *system, const char *event, int set) | |
638 | { | |
ae63b31e SR |
639 | struct trace_array *tr = top_trace_array(); |
640 | ||
dc81e5e3 YY |
641 | if (!tr) |
642 | return -ENODEV; | |
643 | ||
ae63b31e | 644 | return __ftrace_set_clr_event(tr, NULL, system, event, set); |
4671c794 | 645 | } |
56355b83 | 646 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 647 | |
b77e38aa SR |
648 | /* 128 should be much more than enough */ |
649 | #define EVENT_BUF_SIZE 127 | |
650 | ||
651 | static ssize_t | |
652 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
653 | size_t cnt, loff_t *ppos) | |
654 | { | |
48966364 | 655 | struct trace_parser parser; |
ae63b31e SR |
656 | struct seq_file *m = file->private_data; |
657 | struct trace_array *tr = m->private; | |
4ba7978e | 658 | ssize_t read, ret; |
b77e38aa | 659 | |
4ba7978e | 660 | if (!cnt) |
b77e38aa SR |
661 | return 0; |
662 | ||
1852fcce SR |
663 | ret = tracing_update_buffers(); |
664 | if (ret < 0) | |
665 | return ret; | |
666 | ||
48966364 | 667 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
668 | return -ENOMEM; |
669 | ||
48966364 | 670 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
671 | ||
4ba7978e | 672 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 673 | int set = 1; |
b77e38aa | 674 | |
48966364 | 675 | if (*parser.buffer == '!') |
b77e38aa | 676 | set = 0; |
b77e38aa | 677 | |
48966364 | 678 | parser.buffer[parser.idx] = 0; |
679 | ||
ae63b31e | 680 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
b77e38aa | 681 | if (ret) |
48966364 | 682 | goto out_put; |
b77e38aa | 683 | } |
b77e38aa SR |
684 | |
685 | ret = read; | |
686 | ||
48966364 | 687 | out_put: |
688 | trace_parser_put(&parser); | |
b77e38aa SR |
689 | |
690 | return ret; | |
691 | } | |
692 | ||
693 | static void * | |
694 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
695 | { | |
7f1d2f82 | 696 | struct trace_event_file *file = v; |
2425bcb9 | 697 | struct trace_event_call *call; |
ae63b31e | 698 | struct trace_array *tr = m->private; |
b77e38aa SR |
699 | |
700 | (*pos)++; | |
701 | ||
ae63b31e SR |
702 | list_for_each_entry_continue(file, &tr->events, list) { |
703 | call = file->event_call; | |
40e26815 SR |
704 | /* |
705 | * The ftrace subsystem is for showing formats only. | |
706 | * They can not be enabled or disabled via the event files. | |
707 | */ | |
a1d0ce82 | 708 | if (call->class && call->class->reg) |
ae63b31e | 709 | return file; |
40e26815 | 710 | } |
b77e38aa | 711 | |
30bd39cd | 712 | return NULL; |
b77e38aa SR |
713 | } |
714 | ||
715 | static void *t_start(struct seq_file *m, loff_t *pos) | |
716 | { | |
7f1d2f82 | 717 | struct trace_event_file *file; |
ae63b31e | 718 | struct trace_array *tr = m->private; |
e1c7e2a6 LZ |
719 | loff_t l; |
720 | ||
20c8928a | 721 | mutex_lock(&event_mutex); |
e1c7e2a6 | 722 | |
7f1d2f82 | 723 | file = list_entry(&tr->events, struct trace_event_file, list); |
e1c7e2a6 | 724 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
725 | file = t_next(m, file, &l); |
726 | if (!file) | |
e1c7e2a6 LZ |
727 | break; |
728 | } | |
ae63b31e | 729 | return file; |
b77e38aa SR |
730 | } |
731 | ||
732 | static void * | |
733 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
734 | { | |
7f1d2f82 | 735 | struct trace_event_file *file = v; |
ae63b31e | 736 | struct trace_array *tr = m->private; |
b77e38aa SR |
737 | |
738 | (*pos)++; | |
739 | ||
ae63b31e | 740 | list_for_each_entry_continue(file, &tr->events, list) { |
5d6ad960 | 741 | if (file->flags & EVENT_FILE_FL_ENABLED) |
ae63b31e | 742 | return file; |
b77e38aa SR |
743 | } |
744 | ||
30bd39cd | 745 | return NULL; |
b77e38aa SR |
746 | } |
747 | ||
748 | static void *s_start(struct seq_file *m, loff_t *pos) | |
749 | { | |
7f1d2f82 | 750 | struct trace_event_file *file; |
ae63b31e | 751 | struct trace_array *tr = m->private; |
e1c7e2a6 LZ |
752 | loff_t l; |
753 | ||
20c8928a | 754 | mutex_lock(&event_mutex); |
e1c7e2a6 | 755 | |
7f1d2f82 | 756 | file = list_entry(&tr->events, struct trace_event_file, list); |
e1c7e2a6 | 757 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
758 | file = s_next(m, file, &l); |
759 | if (!file) | |
e1c7e2a6 LZ |
760 | break; |
761 | } | |
ae63b31e | 762 | return file; |
b77e38aa SR |
763 | } |
764 | ||
765 | static int t_show(struct seq_file *m, void *v) | |
766 | { | |
7f1d2f82 | 767 | struct trace_event_file *file = v; |
2425bcb9 | 768 | struct trace_event_call *call = file->event_call; |
b77e38aa | 769 | |
8f082018 SR |
770 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
771 | seq_printf(m, "%s:", call->class->system); | |
687fcc4a | 772 | seq_printf(m, "%s\n", trace_event_name(call)); |
b77e38aa SR |
773 | |
774 | return 0; | |
775 | } | |
776 | ||
777 | static void t_stop(struct seq_file *m, void *p) | |
778 | { | |
20c8928a | 779 | mutex_unlock(&event_mutex); |
b77e38aa SR |
780 | } |
781 | ||
1473e441 SR |
782 | static ssize_t |
783 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
784 | loff_t *ppos) | |
785 | { | |
7f1d2f82 | 786 | struct trace_event_file *file; |
bc6f6b08 | 787 | unsigned long flags; |
a4390596 TZ |
788 | char buf[4] = "0"; |
789 | ||
bc6f6b08 ON |
790 | mutex_lock(&event_mutex); |
791 | file = event_file_data(filp); | |
792 | if (likely(file)) | |
793 | flags = file->flags; | |
794 | mutex_unlock(&event_mutex); | |
795 | ||
796 | if (!file) | |
797 | return -ENODEV; | |
798 | ||
5d6ad960 SRRH |
799 | if (flags & EVENT_FILE_FL_ENABLED && |
800 | !(flags & EVENT_FILE_FL_SOFT_DISABLED)) | |
a4390596 TZ |
801 | strcpy(buf, "1"); |
802 | ||
5d6ad960 SRRH |
803 | if (flags & EVENT_FILE_FL_SOFT_DISABLED || |
804 | flags & EVENT_FILE_FL_SOFT_MODE) | |
a4390596 TZ |
805 | strcat(buf, "*"); |
806 | ||
807 | strcat(buf, "\n"); | |
1473e441 | 808 | |
417944c4 | 809 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf)); |
1473e441 SR |
810 | } |
811 | ||
812 | static ssize_t | |
813 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
814 | loff_t *ppos) | |
815 | { | |
7f1d2f82 | 816 | struct trace_event_file *file; |
1473e441 SR |
817 | unsigned long val; |
818 | int ret; | |
819 | ||
22fe9b54 PH |
820 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
821 | if (ret) | |
1473e441 SR |
822 | return ret; |
823 | ||
1852fcce SR |
824 | ret = tracing_update_buffers(); |
825 | if (ret < 0) | |
826 | return ret; | |
827 | ||
1473e441 SR |
828 | switch (val) { |
829 | case 0: | |
1473e441 | 830 | case 1: |
bc6f6b08 | 831 | ret = -ENODEV; |
11a241a3 | 832 | mutex_lock(&event_mutex); |
bc6f6b08 ON |
833 | file = event_file_data(filp); |
834 | if (likely(file)) | |
835 | ret = ftrace_event_enable_disable(file, val); | |
11a241a3 | 836 | mutex_unlock(&event_mutex); |
1473e441 SR |
837 | break; |
838 | ||
839 | default: | |
840 | return -EINVAL; | |
841 | } | |
842 | ||
843 | *ppos += cnt; | |
844 | ||
3b8e4273 | 845 | return ret ? ret : cnt; |
1473e441 SR |
846 | } |
847 | ||
8ae79a13 SR |
848 | static ssize_t |
849 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
850 | loff_t *ppos) | |
851 | { | |
c142b15d | 852 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
7967b3e0 | 853 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 854 | struct event_subsystem *system = dir->subsystem; |
2425bcb9 | 855 | struct trace_event_call *call; |
7f1d2f82 | 856 | struct trace_event_file *file; |
ae63b31e | 857 | struct trace_array *tr = dir->tr; |
8ae79a13 | 858 | char buf[2]; |
c142b15d | 859 | int set = 0; |
8ae79a13 SR |
860 | int ret; |
861 | ||
8ae79a13 | 862 | mutex_lock(&event_mutex); |
ae63b31e SR |
863 | list_for_each_entry(file, &tr->events, list) { |
864 | call = file->event_call; | |
687fcc4a | 865 | if (!trace_event_name(call) || !call->class || !call->class->reg) |
8ae79a13 SR |
866 | continue; |
867 | ||
40ee4dff | 868 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
869 | continue; |
870 | ||
871 | /* | |
872 | * We need to find out if all the events are set | |
873 | * or if all events or cleared, or if we have | |
874 | * a mixture. | |
875 | */ | |
5d6ad960 | 876 | set |= (1 << !!(file->flags & EVENT_FILE_FL_ENABLED)); |
c142b15d | 877 | |
8ae79a13 SR |
878 | /* |
879 | * If we have a mixture, no need to look further. | |
880 | */ | |
c142b15d | 881 | if (set == 3) |
8ae79a13 SR |
882 | break; |
883 | } | |
884 | mutex_unlock(&event_mutex); | |
885 | ||
c142b15d | 886 | buf[0] = set_to_char[set]; |
8ae79a13 | 887 | buf[1] = '\n'; |
8ae79a13 SR |
888 | |
889 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
890 | ||
891 | return ret; | |
892 | } | |
893 | ||
894 | static ssize_t | |
895 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
896 | loff_t *ppos) | |
897 | { | |
7967b3e0 | 898 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 899 | struct event_subsystem *system = dir->subsystem; |
40ee4dff | 900 | const char *name = NULL; |
8ae79a13 | 901 | unsigned long val; |
8ae79a13 SR |
902 | ssize_t ret; |
903 | ||
22fe9b54 PH |
904 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
905 | if (ret) | |
8ae79a13 SR |
906 | return ret; |
907 | ||
908 | ret = tracing_update_buffers(); | |
909 | if (ret < 0) | |
910 | return ret; | |
911 | ||
8f31bfe5 | 912 | if (val != 0 && val != 1) |
8ae79a13 | 913 | return -EINVAL; |
8ae79a13 | 914 | |
40ee4dff SR |
915 | /* |
916 | * Opening of "enable" adds a ref count to system, | |
917 | * so the name is safe to use. | |
918 | */ | |
919 | if (system) | |
920 | name = system->name; | |
921 | ||
ae63b31e | 922 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
8ae79a13 | 923 | if (ret) |
8f31bfe5 | 924 | goto out; |
8ae79a13 SR |
925 | |
926 | ret = cnt; | |
927 | ||
8f31bfe5 | 928 | out: |
8ae79a13 SR |
929 | *ppos += cnt; |
930 | ||
931 | return ret; | |
932 | } | |
933 | ||
2a37a3df SR |
934 | enum { |
935 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
936 | FORMAT_FIELD_SEPERATOR = 2, |
937 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
938 | }; |
939 | ||
940 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 941 | { |
2425bcb9 | 942 | struct trace_event_call *call = event_file_data(m->private); |
86397dc3 LZ |
943 | struct list_head *common_head = &ftrace_common_fields; |
944 | struct list_head *head = trace_get_fields(call); | |
7710b639 | 945 | struct list_head *node = v; |
981d081e | 946 | |
2a37a3df | 947 | (*pos)++; |
5a65e956 | 948 | |
2a37a3df SR |
949 | switch ((unsigned long)v) { |
950 | case FORMAT_HEADER: | |
7710b639 ON |
951 | node = common_head; |
952 | break; | |
5a65e956 | 953 | |
86397dc3 | 954 | case FORMAT_FIELD_SEPERATOR: |
7710b639 ON |
955 | node = head; |
956 | break; | |
5a65e956 | 957 | |
2a37a3df SR |
958 | case FORMAT_PRINTFMT: |
959 | /* all done */ | |
960 | return NULL; | |
5a65e956 LJ |
961 | } |
962 | ||
7710b639 ON |
963 | node = node->prev; |
964 | if (node == common_head) | |
86397dc3 | 965 | return (void *)FORMAT_FIELD_SEPERATOR; |
7710b639 | 966 | else if (node == head) |
2a37a3df | 967 | return (void *)FORMAT_PRINTFMT; |
7710b639 ON |
968 | else |
969 | return node; | |
2a37a3df SR |
970 | } |
971 | ||
972 | static int f_show(struct seq_file *m, void *v) | |
973 | { | |
2425bcb9 | 974 | struct trace_event_call *call = event_file_data(m->private); |
2a37a3df SR |
975 | struct ftrace_event_field *field; |
976 | const char *array_descriptor; | |
977 | ||
978 | switch ((unsigned long)v) { | |
979 | case FORMAT_HEADER: | |
687fcc4a | 980 | seq_printf(m, "name: %s\n", trace_event_name(call)); |
2a37a3df | 981 | seq_printf(m, "ID: %d\n", call->event.type); |
fa6f0cc7 | 982 | seq_puts(m, "format:\n"); |
8728fe50 | 983 | return 0; |
5a65e956 | 984 | |
86397dc3 LZ |
985 | case FORMAT_FIELD_SEPERATOR: |
986 | seq_putc(m, '\n'); | |
987 | return 0; | |
988 | ||
2a37a3df SR |
989 | case FORMAT_PRINTFMT: |
990 | seq_printf(m, "\nprint fmt: %s\n", | |
991 | call->print_fmt); | |
992 | return 0; | |
981d081e | 993 | } |
8728fe50 | 994 | |
7710b639 | 995 | field = list_entry(v, struct ftrace_event_field, link); |
2a37a3df SR |
996 | /* |
997 | * Smartly shows the array type(except dynamic array). | |
998 | * Normal: | |
999 | * field:TYPE VAR | |
1000 | * If TYPE := TYPE[LEN], it is shown: | |
1001 | * field:TYPE VAR[LEN] | |
1002 | */ | |
1003 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 1004 | |
2a37a3df SR |
1005 | if (!strncmp(field->type, "__data_loc", 10)) |
1006 | array_descriptor = NULL; | |
8728fe50 | 1007 | |
2a37a3df SR |
1008 | if (!array_descriptor) |
1009 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
1010 | field->type, field->name, field->offset, | |
1011 | field->size, !!field->is_signed); | |
1012 | else | |
1013 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
1014 | (int)(array_descriptor - field->type), | |
1015 | field->type, field->name, | |
1016 | array_descriptor, field->offset, | |
1017 | field->size, !!field->is_signed); | |
8728fe50 | 1018 | |
2a37a3df SR |
1019 | return 0; |
1020 | } | |
5a65e956 | 1021 | |
7710b639 ON |
1022 | static void *f_start(struct seq_file *m, loff_t *pos) |
1023 | { | |
1024 | void *p = (void *)FORMAT_HEADER; | |
1025 | loff_t l = 0; | |
1026 | ||
c5a44a12 ON |
1027 | /* ->stop() is called even if ->start() fails */ |
1028 | mutex_lock(&event_mutex); | |
1029 | if (!event_file_data(m->private)) | |
1030 | return ERR_PTR(-ENODEV); | |
1031 | ||
7710b639 ON |
1032 | while (l < *pos && p) |
1033 | p = f_next(m, p, &l); | |
1034 | ||
1035 | return p; | |
1036 | } | |
1037 | ||
2a37a3df SR |
1038 | static void f_stop(struct seq_file *m, void *p) |
1039 | { | |
c5a44a12 | 1040 | mutex_unlock(&event_mutex); |
2a37a3df | 1041 | } |
981d081e | 1042 | |
2a37a3df SR |
1043 | static const struct seq_operations trace_format_seq_ops = { |
1044 | .start = f_start, | |
1045 | .next = f_next, | |
1046 | .stop = f_stop, | |
1047 | .show = f_show, | |
1048 | }; | |
1049 | ||
1050 | static int trace_format_open(struct inode *inode, struct file *file) | |
1051 | { | |
2a37a3df SR |
1052 | struct seq_file *m; |
1053 | int ret; | |
1054 | ||
1055 | ret = seq_open(file, &trace_format_seq_ops); | |
1056 | if (ret < 0) | |
1057 | return ret; | |
1058 | ||
1059 | m = file->private_data; | |
c5a44a12 | 1060 | m->private = file; |
2a37a3df SR |
1061 | |
1062 | return 0; | |
981d081e SR |
1063 | } |
1064 | ||
23725aee PZ |
1065 | static ssize_t |
1066 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1067 | { | |
1a11126b | 1068 | int id = (long)event_file_data(filp); |
cd458ba9 ON |
1069 | char buf[32]; |
1070 | int len; | |
23725aee PZ |
1071 | |
1072 | if (*ppos) | |
1073 | return 0; | |
1074 | ||
1a11126b ON |
1075 | if (unlikely(!id)) |
1076 | return -ENODEV; | |
1077 | ||
1078 | len = sprintf(buf, "%d\n", id); | |
1079 | ||
cd458ba9 | 1080 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); |
23725aee PZ |
1081 | } |
1082 | ||
7ce7e424 TZ |
1083 | static ssize_t |
1084 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1085 | loff_t *ppos) | |
1086 | { | |
7f1d2f82 | 1087 | struct trace_event_file *file; |
7ce7e424 | 1088 | struct trace_seq *s; |
e2912b09 | 1089 | int r = -ENODEV; |
7ce7e424 TZ |
1090 | |
1091 | if (*ppos) | |
1092 | return 0; | |
1093 | ||
1094 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
e2912b09 | 1095 | |
7ce7e424 TZ |
1096 | if (!s) |
1097 | return -ENOMEM; | |
1098 | ||
1099 | trace_seq_init(s); | |
1100 | ||
e2912b09 | 1101 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1102 | file = event_file_data(filp); |
1103 | if (file) | |
1104 | print_event_filter(file, s); | |
e2912b09 ON |
1105 | mutex_unlock(&event_mutex); |
1106 | ||
f306cc82 | 1107 | if (file) |
5ac48378 SRRH |
1108 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1109 | s->buffer, trace_seq_used(s)); | |
7ce7e424 TZ |
1110 | |
1111 | kfree(s); | |
1112 | ||
1113 | return r; | |
1114 | } | |
1115 | ||
1116 | static ssize_t | |
1117 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1118 | loff_t *ppos) | |
1119 | { | |
7f1d2f82 | 1120 | struct trace_event_file *file; |
8b372562 | 1121 | char *buf; |
e2912b09 | 1122 | int err = -ENODEV; |
7ce7e424 | 1123 | |
8b372562 | 1124 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
1125 | return -EINVAL; |
1126 | ||
8b372562 TZ |
1127 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
1128 | if (!buf) | |
7ce7e424 TZ |
1129 | return -ENOMEM; |
1130 | ||
8b372562 TZ |
1131 | if (copy_from_user(buf, ubuf, cnt)) { |
1132 | free_page((unsigned long) buf); | |
1133 | return -EFAULT; | |
7ce7e424 | 1134 | } |
8b372562 | 1135 | buf[cnt] = '\0'; |
7ce7e424 | 1136 | |
e2912b09 | 1137 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1138 | file = event_file_data(filp); |
1139 | if (file) | |
1140 | err = apply_event_filter(file, buf); | |
e2912b09 ON |
1141 | mutex_unlock(&event_mutex); |
1142 | ||
8b372562 TZ |
1143 | free_page((unsigned long) buf); |
1144 | if (err < 0) | |
44e9c8b7 | 1145 | return err; |
0a19e53c | 1146 | |
7ce7e424 TZ |
1147 | *ppos += cnt; |
1148 | ||
1149 | return cnt; | |
1150 | } | |
1151 | ||
e9dbfae5 SR |
1152 | static LIST_HEAD(event_subsystems); |
1153 | ||
1154 | static int subsystem_open(struct inode *inode, struct file *filp) | |
1155 | { | |
1156 | struct event_subsystem *system = NULL; | |
7967b3e0 | 1157 | struct trace_subsystem_dir *dir = NULL; /* Initialize for gcc */ |
ae63b31e | 1158 | struct trace_array *tr; |
e9dbfae5 SR |
1159 | int ret; |
1160 | ||
d6d3523c GB |
1161 | if (tracing_is_disabled()) |
1162 | return -ENODEV; | |
1163 | ||
e9dbfae5 | 1164 | /* Make sure the system still exists */ |
a8227415 | 1165 | mutex_lock(&trace_types_lock); |
e9dbfae5 | 1166 | mutex_lock(&event_mutex); |
ae63b31e SR |
1167 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
1168 | list_for_each_entry(dir, &tr->systems, list) { | |
1169 | if (dir == inode->i_private) { | |
1170 | /* Don't open systems with no events */ | |
1171 | if (dir->nr_events) { | |
1172 | __get_system_dir(dir); | |
1173 | system = dir->subsystem; | |
1174 | } | |
1175 | goto exit_loop; | |
e9dbfae5 | 1176 | } |
e9dbfae5 SR |
1177 | } |
1178 | } | |
ae63b31e | 1179 | exit_loop: |
e9dbfae5 | 1180 | mutex_unlock(&event_mutex); |
a8227415 | 1181 | mutex_unlock(&trace_types_lock); |
e9dbfae5 | 1182 | |
ae63b31e | 1183 | if (!system) |
e9dbfae5 SR |
1184 | return -ENODEV; |
1185 | ||
ae63b31e SR |
1186 | /* Some versions of gcc think dir can be uninitialized here */ |
1187 | WARN_ON(!dir); | |
1188 | ||
8e2e2fa4 SRRH |
1189 | /* Still need to increment the ref count of the system */ |
1190 | if (trace_array_get(tr) < 0) { | |
1191 | put_system(dir); | |
1192 | return -ENODEV; | |
1193 | } | |
1194 | ||
e9dbfae5 | 1195 | ret = tracing_open_generic(inode, filp); |
8e2e2fa4 SRRH |
1196 | if (ret < 0) { |
1197 | trace_array_put(tr); | |
ae63b31e | 1198 | put_system(dir); |
8e2e2fa4 | 1199 | } |
ae63b31e SR |
1200 | |
1201 | return ret; | |
1202 | } | |
1203 | ||
1204 | static int system_tr_open(struct inode *inode, struct file *filp) | |
1205 | { | |
7967b3e0 | 1206 | struct trace_subsystem_dir *dir; |
ae63b31e SR |
1207 | struct trace_array *tr = inode->i_private; |
1208 | int ret; | |
1209 | ||
d6d3523c GB |
1210 | if (tracing_is_disabled()) |
1211 | return -ENODEV; | |
1212 | ||
8e2e2fa4 SRRH |
1213 | if (trace_array_get(tr) < 0) |
1214 | return -ENODEV; | |
1215 | ||
ae63b31e SR |
1216 | /* Make a temporary dir that has no system but points to tr */ |
1217 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); | |
8e2e2fa4 SRRH |
1218 | if (!dir) { |
1219 | trace_array_put(tr); | |
ae63b31e | 1220 | return -ENOMEM; |
8e2e2fa4 | 1221 | } |
ae63b31e SR |
1222 | |
1223 | dir->tr = tr; | |
1224 | ||
1225 | ret = tracing_open_generic(inode, filp); | |
8e2e2fa4 SRRH |
1226 | if (ret < 0) { |
1227 | trace_array_put(tr); | |
ae63b31e | 1228 | kfree(dir); |
d6d3523c | 1229 | return ret; |
8e2e2fa4 | 1230 | } |
ae63b31e SR |
1231 | |
1232 | filp->private_data = dir; | |
e9dbfae5 | 1233 | |
d6d3523c | 1234 | return 0; |
e9dbfae5 SR |
1235 | } |
1236 | ||
1237 | static int subsystem_release(struct inode *inode, struct file *file) | |
1238 | { | |
7967b3e0 | 1239 | struct trace_subsystem_dir *dir = file->private_data; |
e9dbfae5 | 1240 | |
8e2e2fa4 SRRH |
1241 | trace_array_put(dir->tr); |
1242 | ||
ae63b31e SR |
1243 | /* |
1244 | * If dir->subsystem is NULL, then this is a temporary | |
1245 | * descriptor that was made for a trace_array to enable | |
1246 | * all subsystems. | |
1247 | */ | |
1248 | if (dir->subsystem) | |
1249 | put_system(dir); | |
1250 | else | |
1251 | kfree(dir); | |
e9dbfae5 SR |
1252 | |
1253 | return 0; | |
1254 | } | |
1255 | ||
cfb180f3 TZ |
1256 | static ssize_t |
1257 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1258 | loff_t *ppos) | |
1259 | { | |
7967b3e0 | 1260 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1261 | struct event_subsystem *system = dir->subsystem; |
cfb180f3 TZ |
1262 | struct trace_seq *s; |
1263 | int r; | |
1264 | ||
1265 | if (*ppos) | |
1266 | return 0; | |
1267 | ||
1268 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1269 | if (!s) | |
1270 | return -ENOMEM; | |
1271 | ||
1272 | trace_seq_init(s); | |
1273 | ||
8b372562 | 1274 | print_subsystem_event_filter(system, s); |
5ac48378 SRRH |
1275 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1276 | s->buffer, trace_seq_used(s)); | |
cfb180f3 TZ |
1277 | |
1278 | kfree(s); | |
1279 | ||
1280 | return r; | |
1281 | } | |
1282 | ||
1283 | static ssize_t | |
1284 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1285 | loff_t *ppos) | |
1286 | { | |
7967b3e0 | 1287 | struct trace_subsystem_dir *dir = filp->private_data; |
8b372562 | 1288 | char *buf; |
cfb180f3 TZ |
1289 | int err; |
1290 | ||
8b372562 | 1291 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
1292 | return -EINVAL; |
1293 | ||
8b372562 TZ |
1294 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
1295 | if (!buf) | |
cfb180f3 TZ |
1296 | return -ENOMEM; |
1297 | ||
8b372562 TZ |
1298 | if (copy_from_user(buf, ubuf, cnt)) { |
1299 | free_page((unsigned long) buf); | |
1300 | return -EFAULT; | |
cfb180f3 | 1301 | } |
8b372562 | 1302 | buf[cnt] = '\0'; |
cfb180f3 | 1303 | |
ae63b31e | 1304 | err = apply_subsystem_event_filter(dir, buf); |
8b372562 TZ |
1305 | free_page((unsigned long) buf); |
1306 | if (err < 0) | |
44e9c8b7 | 1307 | return err; |
cfb180f3 TZ |
1308 | |
1309 | *ppos += cnt; | |
1310 | ||
1311 | return cnt; | |
1312 | } | |
1313 | ||
d1b182a8 SR |
1314 | static ssize_t |
1315 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1316 | { | |
1317 | int (*func)(struct trace_seq *s) = filp->private_data; | |
1318 | struct trace_seq *s; | |
1319 | int r; | |
1320 | ||
1321 | if (*ppos) | |
1322 | return 0; | |
1323 | ||
1324 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1325 | if (!s) | |
1326 | return -ENOMEM; | |
1327 | ||
1328 | trace_seq_init(s); | |
1329 | ||
1330 | func(s); | |
5ac48378 SRRH |
1331 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1332 | s->buffer, trace_seq_used(s)); | |
d1b182a8 SR |
1333 | |
1334 | kfree(s); | |
1335 | ||
1336 | return r; | |
1337 | } | |
1338 | ||
15075cac SR |
1339 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
1340 | static int ftrace_event_set_open(struct inode *inode, struct file *file); | |
f77d09a3 | 1341 | static int ftrace_event_release(struct inode *inode, struct file *file); |
15075cac | 1342 | |
b77e38aa SR |
1343 | static const struct seq_operations show_event_seq_ops = { |
1344 | .start = t_start, | |
1345 | .next = t_next, | |
1346 | .show = t_show, | |
1347 | .stop = t_stop, | |
1348 | }; | |
1349 | ||
1350 | static const struct seq_operations show_set_event_seq_ops = { | |
1351 | .start = s_start, | |
1352 | .next = s_next, | |
1353 | .show = t_show, | |
1354 | .stop = t_stop, | |
1355 | }; | |
1356 | ||
2314c4ae | 1357 | static const struct file_operations ftrace_avail_fops = { |
15075cac | 1358 | .open = ftrace_event_avail_open, |
2314c4ae SR |
1359 | .read = seq_read, |
1360 | .llseek = seq_lseek, | |
1361 | .release = seq_release, | |
1362 | }; | |
1363 | ||
b77e38aa | 1364 | static const struct file_operations ftrace_set_event_fops = { |
15075cac | 1365 | .open = ftrace_event_set_open, |
b77e38aa SR |
1366 | .read = seq_read, |
1367 | .write = ftrace_event_write, | |
1368 | .llseek = seq_lseek, | |
f77d09a3 | 1369 | .release = ftrace_event_release, |
b77e38aa SR |
1370 | }; |
1371 | ||
1473e441 | 1372 | static const struct file_operations ftrace_enable_fops = { |
bf682c31 | 1373 | .open = tracing_open_generic, |
1473e441 SR |
1374 | .read = event_enable_read, |
1375 | .write = event_enable_write, | |
6038f373 | 1376 | .llseek = default_llseek, |
1473e441 SR |
1377 | }; |
1378 | ||
981d081e | 1379 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
1380 | .open = trace_format_open, |
1381 | .read = seq_read, | |
1382 | .llseek = seq_lseek, | |
1383 | .release = seq_release, | |
981d081e SR |
1384 | }; |
1385 | ||
23725aee | 1386 | static const struct file_operations ftrace_event_id_fops = { |
23725aee | 1387 | .read = event_id_read, |
6038f373 | 1388 | .llseek = default_llseek, |
23725aee PZ |
1389 | }; |
1390 | ||
7ce7e424 TZ |
1391 | static const struct file_operations ftrace_event_filter_fops = { |
1392 | .open = tracing_open_generic, | |
1393 | .read = event_filter_read, | |
1394 | .write = event_filter_write, | |
6038f373 | 1395 | .llseek = default_llseek, |
7ce7e424 TZ |
1396 | }; |
1397 | ||
cfb180f3 | 1398 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 1399 | .open = subsystem_open, |
cfb180f3 TZ |
1400 | .read = subsystem_filter_read, |
1401 | .write = subsystem_filter_write, | |
6038f373 | 1402 | .llseek = default_llseek, |
e9dbfae5 | 1403 | .release = subsystem_release, |
cfb180f3 TZ |
1404 | }; |
1405 | ||
8ae79a13 | 1406 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 1407 | .open = subsystem_open, |
8ae79a13 SR |
1408 | .read = system_enable_read, |
1409 | .write = system_enable_write, | |
6038f373 | 1410 | .llseek = default_llseek, |
40ee4dff | 1411 | .release = subsystem_release, |
8ae79a13 SR |
1412 | }; |
1413 | ||
ae63b31e SR |
1414 | static const struct file_operations ftrace_tr_enable_fops = { |
1415 | .open = system_tr_open, | |
1416 | .read = system_enable_read, | |
1417 | .write = system_enable_write, | |
1418 | .llseek = default_llseek, | |
1419 | .release = subsystem_release, | |
1420 | }; | |
1421 | ||
d1b182a8 SR |
1422 | static const struct file_operations ftrace_show_header_fops = { |
1423 | .open = tracing_open_generic, | |
1424 | .read = show_header, | |
6038f373 | 1425 | .llseek = default_llseek, |
d1b182a8 SR |
1426 | }; |
1427 | ||
ae63b31e SR |
1428 | static int |
1429 | ftrace_event_open(struct inode *inode, struct file *file, | |
1430 | const struct seq_operations *seq_ops) | |
1473e441 | 1431 | { |
ae63b31e SR |
1432 | struct seq_file *m; |
1433 | int ret; | |
1473e441 | 1434 | |
ae63b31e SR |
1435 | ret = seq_open(file, seq_ops); |
1436 | if (ret < 0) | |
1437 | return ret; | |
1438 | m = file->private_data; | |
1439 | /* copy tr over to seq ops */ | |
1440 | m->private = inode->i_private; | |
1473e441 | 1441 | |
ae63b31e | 1442 | return ret; |
1473e441 SR |
1443 | } |
1444 | ||
f77d09a3 AL |
1445 | static int ftrace_event_release(struct inode *inode, struct file *file) |
1446 | { | |
1447 | struct trace_array *tr = inode->i_private; | |
1448 | ||
1449 | trace_array_put(tr); | |
1450 | ||
1451 | return seq_release(inode, file); | |
1452 | } | |
1453 | ||
15075cac SR |
1454 | static int |
1455 | ftrace_event_avail_open(struct inode *inode, struct file *file) | |
1456 | { | |
1457 | const struct seq_operations *seq_ops = &show_event_seq_ops; | |
1458 | ||
ae63b31e | 1459 | return ftrace_event_open(inode, file, seq_ops); |
15075cac SR |
1460 | } |
1461 | ||
1462 | static int | |
1463 | ftrace_event_set_open(struct inode *inode, struct file *file) | |
1464 | { | |
1465 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; | |
ae63b31e | 1466 | struct trace_array *tr = inode->i_private; |
f77d09a3 AL |
1467 | int ret; |
1468 | ||
1469 | if (trace_array_get(tr) < 0) | |
1470 | return -ENODEV; | |
15075cac SR |
1471 | |
1472 | if ((file->f_mode & FMODE_WRITE) && | |
1473 | (file->f_flags & O_TRUNC)) | |
ae63b31e | 1474 | ftrace_clear_events(tr); |
15075cac | 1475 | |
f77d09a3 AL |
1476 | ret = ftrace_event_open(inode, file, seq_ops); |
1477 | if (ret < 0) | |
1478 | trace_array_put(tr); | |
1479 | return ret; | |
ae63b31e SR |
1480 | } |
1481 | ||
1482 | static struct event_subsystem * | |
1483 | create_new_subsystem(const char *name) | |
1484 | { | |
1485 | struct event_subsystem *system; | |
1486 | ||
1487 | /* need to create new entry */ | |
1488 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1489 | if (!system) | |
1490 | return NULL; | |
1491 | ||
1492 | system->ref_count = 1; | |
6e94a780 SR |
1493 | |
1494 | /* Only allocate if dynamic (kprobes and modules) */ | |
1495 | if (!core_kernel_data((unsigned long)name)) { | |
1496 | system->ref_count |= SYSTEM_FL_FREE_NAME; | |
1497 | system->name = kstrdup(name, GFP_KERNEL); | |
1498 | if (!system->name) | |
1499 | goto out_free; | |
1500 | } else | |
1501 | system->name = name; | |
ae63b31e SR |
1502 | |
1503 | system->filter = NULL; | |
1504 | ||
1505 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); | |
1506 | if (!system->filter) | |
1507 | goto out_free; | |
1508 | ||
1509 | list_add(&system->list, &event_subsystems); | |
1510 | ||
1511 | return system; | |
1512 | ||
1513 | out_free: | |
6e94a780 SR |
1514 | if (system->ref_count & SYSTEM_FL_FREE_NAME) |
1515 | kfree(system->name); | |
ae63b31e SR |
1516 | kfree(system); |
1517 | return NULL; | |
15075cac SR |
1518 | } |
1519 | ||
6ecc2d1c | 1520 | static struct dentry * |
ae63b31e | 1521 | event_subsystem_dir(struct trace_array *tr, const char *name, |
7f1d2f82 | 1522 | struct trace_event_file *file, struct dentry *parent) |
6ecc2d1c | 1523 | { |
7967b3e0 | 1524 | struct trace_subsystem_dir *dir; |
6ecc2d1c | 1525 | struct event_subsystem *system; |
e1112b4d | 1526 | struct dentry *entry; |
6ecc2d1c SR |
1527 | |
1528 | /* First see if we did not already create this dir */ | |
ae63b31e SR |
1529 | list_for_each_entry(dir, &tr->systems, list) { |
1530 | system = dir->subsystem; | |
dc82ec98 | 1531 | if (strcmp(system->name, name) == 0) { |
ae63b31e SR |
1532 | dir->nr_events++; |
1533 | file->system = dir; | |
1534 | return dir->entry; | |
dc82ec98 | 1535 | } |
6ecc2d1c SR |
1536 | } |
1537 | ||
ae63b31e SR |
1538 | /* Now see if the system itself exists. */ |
1539 | list_for_each_entry(system, &event_subsystems, list) { | |
1540 | if (strcmp(system->name, name) == 0) | |
1541 | break; | |
6ecc2d1c | 1542 | } |
ae63b31e SR |
1543 | /* Reset system variable when not found */ |
1544 | if (&system->list == &event_subsystems) | |
1545 | system = NULL; | |
6ecc2d1c | 1546 | |
ae63b31e SR |
1547 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
1548 | if (!dir) | |
1549 | goto out_fail; | |
6ecc2d1c | 1550 | |
ae63b31e SR |
1551 | if (!system) { |
1552 | system = create_new_subsystem(name); | |
1553 | if (!system) | |
1554 | goto out_free; | |
1555 | } else | |
1556 | __get_system(system); | |
1557 | ||
8434dc93 | 1558 | dir->entry = tracefs_create_dir(name, parent); |
ae63b31e | 1559 | if (!dir->entry) { |
3448bac3 | 1560 | pr_warn("Failed to create system directory %s\n", name); |
ae63b31e SR |
1561 | __put_system(system); |
1562 | goto out_free; | |
6d723736 SR |
1563 | } |
1564 | ||
ae63b31e SR |
1565 | dir->tr = tr; |
1566 | dir->ref_count = 1; | |
1567 | dir->nr_events = 1; | |
1568 | dir->subsystem = system; | |
1569 | file->system = dir; | |
8b372562 | 1570 | |
8434dc93 | 1571 | entry = tracefs_create_file("filter", 0644, dir->entry, dir, |
e1112b4d | 1572 | &ftrace_subsystem_filter_fops); |
8b372562 TZ |
1573 | if (!entry) { |
1574 | kfree(system->filter); | |
1575 | system->filter = NULL; | |
8434dc93 | 1576 | pr_warn("Could not create tracefs '%s/filter' entry\n", name); |
8b372562 | 1577 | } |
e1112b4d | 1578 | |
ae63b31e | 1579 | trace_create_file("enable", 0644, dir->entry, dir, |
f3f3f009 | 1580 | &ftrace_system_enable_fops); |
8ae79a13 | 1581 | |
ae63b31e SR |
1582 | list_add(&dir->list, &tr->systems); |
1583 | ||
1584 | return dir->entry; | |
1585 | ||
1586 | out_free: | |
1587 | kfree(dir); | |
1588 | out_fail: | |
1589 | /* Only print this message if failed on memory allocation */ | |
1590 | if (!dir || !system) | |
3448bac3 | 1591 | pr_warn("No memory to create event subsystem %s\n", name); |
ae63b31e | 1592 | return NULL; |
6ecc2d1c SR |
1593 | } |
1594 | ||
1473e441 | 1595 | static int |
7f1d2f82 | 1596 | event_create_dir(struct dentry *parent, struct trace_event_file *file) |
1473e441 | 1597 | { |
2425bcb9 | 1598 | struct trace_event_call *call = file->event_call; |
ae63b31e | 1599 | struct trace_array *tr = file->tr; |
2e33af02 | 1600 | struct list_head *head; |
ae63b31e | 1601 | struct dentry *d_events; |
de7b2973 | 1602 | const char *name; |
fd994989 | 1603 | int ret; |
1473e441 | 1604 | |
6ecc2d1c SR |
1605 | /* |
1606 | * If the trace point header did not define TRACE_SYSTEM | |
1607 | * then the system would be called "TRACE_SYSTEM". | |
1608 | */ | |
ae63b31e SR |
1609 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { |
1610 | d_events = event_subsystem_dir(tr, call->class->system, file, parent); | |
1611 | if (!d_events) | |
1612 | return -ENOMEM; | |
1613 | } else | |
1614 | d_events = parent; | |
1615 | ||
687fcc4a | 1616 | name = trace_event_name(call); |
8434dc93 | 1617 | file->dir = tracefs_create_dir(name, d_events); |
ae63b31e | 1618 | if (!file->dir) { |
8434dc93 | 1619 | pr_warn("Could not create tracefs '%s' directory\n", name); |
1473e441 SR |
1620 | return -1; |
1621 | } | |
1622 | ||
9b63776f | 1623 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
ae63b31e | 1624 | trace_create_file("enable", 0644, file->dir, file, |
620a30e9 | 1625 | &ftrace_enable_fops); |
1473e441 | 1626 | |
2239291a | 1627 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 1628 | if (call->event.type && call->class->reg) |
1a11126b | 1629 | trace_create_file("id", 0444, file->dir, |
620a30e9 ON |
1630 | (void *)(long)call->event.type, |
1631 | &ftrace_event_id_fops); | |
2239291a | 1632 | #endif |
23725aee | 1633 | |
c9d932cf LZ |
1634 | /* |
1635 | * Other events may have the same class. Only update | |
1636 | * the fields if they are not already defined. | |
1637 | */ | |
1638 | head = trace_get_fields(call); | |
1639 | if (list_empty(head)) { | |
1640 | ret = call->class->define_fields(call); | |
1641 | if (ret < 0) { | |
3448bac3 FF |
1642 | pr_warn("Could not initialize trace point events/%s\n", |
1643 | name); | |
ae63b31e | 1644 | return -1; |
cf027f64 TZ |
1645 | } |
1646 | } | |
f306cc82 | 1647 | trace_create_file("filter", 0644, file->dir, file, |
620a30e9 | 1648 | &ftrace_event_filter_fops); |
cf027f64 | 1649 | |
85f2b082 TZ |
1650 | trace_create_file("trigger", 0644, file->dir, file, |
1651 | &event_trigger_fops); | |
1652 | ||
ae63b31e | 1653 | trace_create_file("format", 0444, file->dir, call, |
620a30e9 | 1654 | &ftrace_event_format_fops); |
6d723736 SR |
1655 | |
1656 | return 0; | |
1657 | } | |
1658 | ||
2425bcb9 | 1659 | static void remove_event_from_tracers(struct trace_event_call *call) |
ae63b31e | 1660 | { |
7f1d2f82 | 1661 | struct trace_event_file *file; |
ae63b31e SR |
1662 | struct trace_array *tr; |
1663 | ||
1664 | do_for_each_event_file_safe(tr, file) { | |
ae63b31e SR |
1665 | if (file->event_call != call) |
1666 | continue; | |
1667 | ||
f6a84bdc | 1668 | remove_event_file_dir(file); |
ae63b31e SR |
1669 | /* |
1670 | * The do_for_each_event_file_safe() is | |
1671 | * a double loop. After finding the call for this | |
1672 | * trace_array, we use break to jump to the next | |
1673 | * trace_array. | |
1674 | */ | |
1675 | break; | |
1676 | } while_for_each_event_file(); | |
1677 | } | |
1678 | ||
2425bcb9 | 1679 | static void event_remove(struct trace_event_call *call) |
8781915a | 1680 | { |
ae63b31e | 1681 | struct trace_array *tr; |
7f1d2f82 | 1682 | struct trace_event_file *file; |
ae63b31e SR |
1683 | |
1684 | do_for_each_event_file(tr, file) { | |
1685 | if (file->event_call != call) | |
1686 | continue; | |
1687 | ftrace_event_enable_disable(file, 0); | |
1688 | /* | |
1689 | * The do_for_each_event_file() is | |
1690 | * a double loop. After finding the call for this | |
1691 | * trace_array, we use break to jump to the next | |
1692 | * trace_array. | |
1693 | */ | |
1694 | break; | |
1695 | } while_for_each_event_file(); | |
1696 | ||
8781915a | 1697 | if (call->event.funcs) |
9023c930 | 1698 | __unregister_trace_event(&call->event); |
ae63b31e | 1699 | remove_event_from_tracers(call); |
8781915a EG |
1700 | list_del(&call->list); |
1701 | } | |
1702 | ||
2425bcb9 | 1703 | static int event_init(struct trace_event_call *call) |
8781915a EG |
1704 | { |
1705 | int ret = 0; | |
de7b2973 | 1706 | const char *name; |
8781915a | 1707 | |
687fcc4a | 1708 | name = trace_event_name(call); |
de7b2973 | 1709 | if (WARN_ON(!name)) |
8781915a EG |
1710 | return -EINVAL; |
1711 | ||
1712 | if (call->class->raw_init) { | |
1713 | ret = call->class->raw_init(call); | |
1714 | if (ret < 0 && ret != -ENOSYS) | |
3448bac3 | 1715 | pr_warn("Could not initialize trace events/%s\n", name); |
8781915a EG |
1716 | } |
1717 | ||
1718 | return ret; | |
1719 | } | |
1720 | ||
67ead0a6 | 1721 | static int |
2425bcb9 | 1722 | __register_event(struct trace_event_call *call, struct module *mod) |
bd1a5c84 | 1723 | { |
bd1a5c84 | 1724 | int ret; |
6d723736 | 1725 | |
8781915a EG |
1726 | ret = event_init(call); |
1727 | if (ret < 0) | |
1728 | return ret; | |
701970b3 | 1729 | |
ae63b31e | 1730 | list_add(&call->list, &ftrace_events); |
67ead0a6 | 1731 | call->mod = mod; |
88f70d75 | 1732 | |
ae63b31e | 1733 | return 0; |
bd1a5c84 MH |
1734 | } |
1735 | ||
0c564a53 SRRH |
1736 | static char *enum_replace(char *ptr, struct trace_enum_map *map, int len) |
1737 | { | |
1738 | int rlen; | |
1739 | int elen; | |
1740 | ||
1741 | /* Find the length of the enum value as a string */ | |
1742 | elen = snprintf(ptr, 0, "%ld", map->enum_value); | |
1743 | /* Make sure there's enough room to replace the string with the value */ | |
1744 | if (len < elen) | |
1745 | return NULL; | |
1746 | ||
1747 | snprintf(ptr, elen + 1, "%ld", map->enum_value); | |
1748 | ||
1749 | /* Get the rest of the string of ptr */ | |
1750 | rlen = strlen(ptr + len); | |
1751 | memmove(ptr + elen, ptr + len, rlen); | |
1752 | /* Make sure we end the new string */ | |
1753 | ptr[elen + rlen] = 0; | |
1754 | ||
1755 | return ptr + elen; | |
1756 | } | |
1757 | ||
2425bcb9 | 1758 | static void update_event_printk(struct trace_event_call *call, |
0c564a53 SRRH |
1759 | struct trace_enum_map *map) |
1760 | { | |
1761 | char *ptr; | |
1762 | int quote = 0; | |
1763 | int len = strlen(map->enum_string); | |
1764 | ||
1765 | for (ptr = call->print_fmt; *ptr; ptr++) { | |
1766 | if (*ptr == '\\') { | |
1767 | ptr++; | |
1768 | /* paranoid */ | |
1769 | if (!*ptr) | |
1770 | break; | |
1771 | continue; | |
1772 | } | |
1773 | if (*ptr == '"') { | |
1774 | quote ^= 1; | |
1775 | continue; | |
1776 | } | |
1777 | if (quote) | |
1778 | continue; | |
1779 | if (isdigit(*ptr)) { | |
1780 | /* skip numbers */ | |
1781 | do { | |
1782 | ptr++; | |
1783 | /* Check for alpha chars like ULL */ | |
1784 | } while (isalnum(*ptr)); | |
3193899d SRRH |
1785 | if (!*ptr) |
1786 | break; | |
0c564a53 SRRH |
1787 | /* |
1788 | * A number must have some kind of delimiter after | |
1789 | * it, and we can ignore that too. | |
1790 | */ | |
1791 | continue; | |
1792 | } | |
1793 | if (isalpha(*ptr) || *ptr == '_') { | |
1794 | if (strncmp(map->enum_string, ptr, len) == 0 && | |
1795 | !isalnum(ptr[len]) && ptr[len] != '_') { | |
1796 | ptr = enum_replace(ptr, map, len); | |
1797 | /* Hmm, enum string smaller than value */ | |
1798 | if (WARN_ON_ONCE(!ptr)) | |
1799 | return; | |
1800 | /* | |
1801 | * No need to decrement here, as enum_replace() | |
1802 | * returns the pointer to the character passed | |
1803 | * the enum, and two enums can not be placed | |
1804 | * back to back without something in between. | |
1805 | * We can skip that something in between. | |
1806 | */ | |
1807 | continue; | |
1808 | } | |
1809 | skip_more: | |
1810 | do { | |
1811 | ptr++; | |
1812 | } while (isalnum(*ptr) || *ptr == '_'); | |
3193899d SRRH |
1813 | if (!*ptr) |
1814 | break; | |
0c564a53 SRRH |
1815 | /* |
1816 | * If what comes after this variable is a '.' or | |
1817 | * '->' then we can continue to ignore that string. | |
1818 | */ | |
1819 | if (*ptr == '.' || (ptr[0] == '-' && ptr[1] == '>')) { | |
1820 | ptr += *ptr == '.' ? 1 : 2; | |
3193899d SRRH |
1821 | if (!*ptr) |
1822 | break; | |
0c564a53 SRRH |
1823 | goto skip_more; |
1824 | } | |
1825 | /* | |
1826 | * Once again, we can skip the delimiter that came | |
1827 | * after the string. | |
1828 | */ | |
1829 | continue; | |
1830 | } | |
1831 | } | |
1832 | } | |
1833 | ||
1834 | void trace_event_enum_update(struct trace_enum_map **map, int len) | |
1835 | { | |
2425bcb9 | 1836 | struct trace_event_call *call, *p; |
0c564a53 SRRH |
1837 | const char *last_system = NULL; |
1838 | int last_i; | |
1839 | int i; | |
1840 | ||
1841 | down_write(&trace_event_sem); | |
1842 | list_for_each_entry_safe(call, p, &ftrace_events, list) { | |
1843 | /* events are usually grouped together with systems */ | |
1844 | if (!last_system || call->class->system != last_system) { | |
1845 | last_i = 0; | |
1846 | last_system = call->class->system; | |
1847 | } | |
1848 | ||
1849 | for (i = last_i; i < len; i++) { | |
1850 | if (call->class->system == map[i]->system) { | |
1851 | /* Save the first system if need be */ | |
1852 | if (!last_i) | |
1853 | last_i = i; | |
1854 | update_event_printk(call, map[i]); | |
1855 | } | |
1856 | } | |
1857 | } | |
1858 | up_write(&trace_event_sem); | |
1859 | } | |
1860 | ||
7f1d2f82 | 1861 | static struct trace_event_file * |
2425bcb9 | 1862 | trace_create_new_event(struct trace_event_call *call, |
da511bf3 SRRH |
1863 | struct trace_array *tr) |
1864 | { | |
7f1d2f82 | 1865 | struct trace_event_file *file; |
da511bf3 SRRH |
1866 | |
1867 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); | |
1868 | if (!file) | |
1869 | return NULL; | |
1870 | ||
1871 | file->event_call = call; | |
1872 | file->tr = tr; | |
1873 | atomic_set(&file->sm_ref, 0); | |
85f2b082 TZ |
1874 | atomic_set(&file->tm_ref, 0); |
1875 | INIT_LIST_HEAD(&file->triggers); | |
da511bf3 SRRH |
1876 | list_add(&file->list, &tr->events); |
1877 | ||
1878 | return file; | |
1879 | } | |
1880 | ||
ae63b31e SR |
1881 | /* Add an event to a trace directory */ |
1882 | static int | |
2425bcb9 | 1883 | __trace_add_new_event(struct trace_event_call *call, struct trace_array *tr) |
ae63b31e | 1884 | { |
7f1d2f82 | 1885 | struct trace_event_file *file; |
ae63b31e | 1886 | |
da511bf3 | 1887 | file = trace_create_new_event(call, tr); |
ae63b31e SR |
1888 | if (!file) |
1889 | return -ENOMEM; | |
1890 | ||
620a30e9 | 1891 | return event_create_dir(tr->event_dir, file); |
ae63b31e SR |
1892 | } |
1893 | ||
77248221 SR |
1894 | /* |
1895 | * Just create a decriptor for early init. A descriptor is required | |
1896 | * for enabling events at boot. We want to enable events before | |
1897 | * the filesystem is initialized. | |
1898 | */ | |
1899 | static __init int | |
2425bcb9 | 1900 | __trace_early_add_new_event(struct trace_event_call *call, |
77248221 SR |
1901 | struct trace_array *tr) |
1902 | { | |
7f1d2f82 | 1903 | struct trace_event_file *file; |
77248221 | 1904 | |
da511bf3 | 1905 | file = trace_create_new_event(call, tr); |
77248221 SR |
1906 | if (!file) |
1907 | return -ENOMEM; | |
1908 | ||
77248221 SR |
1909 | return 0; |
1910 | } | |
1911 | ||
ae63b31e | 1912 | struct ftrace_module_file_ops; |
2425bcb9 | 1913 | static void __add_event_to_tracers(struct trace_event_call *call); |
ae63b31e | 1914 | |
bd1a5c84 | 1915 | /* Add an additional event_call dynamically */ |
2425bcb9 | 1916 | int trace_add_event_call(struct trace_event_call *call) |
bd1a5c84 MH |
1917 | { |
1918 | int ret; | |
a8227415 | 1919 | mutex_lock(&trace_types_lock); |
bd1a5c84 | 1920 | mutex_lock(&event_mutex); |
701970b3 | 1921 | |
ae63b31e SR |
1922 | ret = __register_event(call, NULL); |
1923 | if (ret >= 0) | |
779c5e37 | 1924 | __add_event_to_tracers(call); |
a2ca5e03 | 1925 | |
ae63b31e | 1926 | mutex_unlock(&event_mutex); |
a8227415 | 1927 | mutex_unlock(&trace_types_lock); |
ae63b31e | 1928 | return ret; |
a2ca5e03 FW |
1929 | } |
1930 | ||
4fead8e4 | 1931 | /* |
a8227415 AL |
1932 | * Must be called under locking of trace_types_lock, event_mutex and |
1933 | * trace_event_sem. | |
4fead8e4 | 1934 | */ |
2425bcb9 | 1935 | static void __trace_remove_event_call(struct trace_event_call *call) |
bd1a5c84 | 1936 | { |
8781915a | 1937 | event_remove(call); |
bd1a5c84 | 1938 | trace_destroy_fields(call); |
57375747 ON |
1939 | free_event_filter(call->filter); |
1940 | call->filter = NULL; | |
bd1a5c84 MH |
1941 | } |
1942 | ||
2425bcb9 | 1943 | static int probe_remove_event_call(struct trace_event_call *call) |
2816c551 ON |
1944 | { |
1945 | struct trace_array *tr; | |
7f1d2f82 | 1946 | struct trace_event_file *file; |
2816c551 ON |
1947 | |
1948 | #ifdef CONFIG_PERF_EVENTS | |
1949 | if (call->perf_refcount) | |
1950 | return -EBUSY; | |
1951 | #endif | |
1952 | do_for_each_event_file(tr, file) { | |
1953 | if (file->event_call != call) | |
1954 | continue; | |
1955 | /* | |
1956 | * We can't rely on ftrace_event_enable_disable(enable => 0) | |
5d6ad960 | 1957 | * we are going to do, EVENT_FILE_FL_SOFT_MODE can suppress |
2816c551 ON |
1958 | * TRACE_REG_UNREGISTER. |
1959 | */ | |
5d6ad960 | 1960 | if (file->flags & EVENT_FILE_FL_ENABLED) |
2816c551 | 1961 | return -EBUSY; |
2ba64035 SRRH |
1962 | /* |
1963 | * The do_for_each_event_file_safe() is | |
1964 | * a double loop. After finding the call for this | |
1965 | * trace_array, we use break to jump to the next | |
1966 | * trace_array. | |
1967 | */ | |
2816c551 ON |
1968 | break; |
1969 | } while_for_each_event_file(); | |
1970 | ||
1971 | __trace_remove_event_call(call); | |
1972 | ||
1973 | return 0; | |
1974 | } | |
1975 | ||
bd1a5c84 | 1976 | /* Remove an event_call */ |
2425bcb9 | 1977 | int trace_remove_event_call(struct trace_event_call *call) |
bd1a5c84 | 1978 | { |
2816c551 ON |
1979 | int ret; |
1980 | ||
a8227415 | 1981 | mutex_lock(&trace_types_lock); |
bd1a5c84 | 1982 | mutex_lock(&event_mutex); |
52f6ad6d | 1983 | down_write(&trace_event_sem); |
2816c551 | 1984 | ret = probe_remove_event_call(call); |
52f6ad6d | 1985 | up_write(&trace_event_sem); |
bd1a5c84 | 1986 | mutex_unlock(&event_mutex); |
a8227415 | 1987 | mutex_unlock(&trace_types_lock); |
2816c551 ON |
1988 | |
1989 | return ret; | |
bd1a5c84 MH |
1990 | } |
1991 | ||
1992 | #define for_each_event(event, start, end) \ | |
1993 | for (event = start; \ | |
1994 | (unsigned long)event < (unsigned long)end; \ | |
1995 | event++) | |
1996 | ||
1997 | #ifdef CONFIG_MODULES | |
1998 | ||
6d723736 SR |
1999 | static void trace_module_add_events(struct module *mod) |
2000 | { | |
2425bcb9 | 2001 | struct trace_event_call **call, **start, **end; |
6d723736 | 2002 | |
45ab2813 SRRH |
2003 | if (!mod->num_trace_events) |
2004 | return; | |
2005 | ||
2006 | /* Don't add infrastructure for mods without tracepoints */ | |
2007 | if (trace_module_has_bad_taint(mod)) { | |
2008 | pr_err("%s: module has bad taint, not creating trace events\n", | |
2009 | mod->name); | |
2010 | return; | |
2011 | } | |
2012 | ||
6d723736 SR |
2013 | start = mod->trace_events; |
2014 | end = mod->trace_events + mod->num_trace_events; | |
2015 | ||
6d723736 | 2016 | for_each_event(call, start, end) { |
ae63b31e | 2017 | __register_event(*call, mod); |
779c5e37 | 2018 | __add_event_to_tracers(*call); |
6d723736 SR |
2019 | } |
2020 | } | |
2021 | ||
2022 | static void trace_module_remove_events(struct module *mod) | |
2023 | { | |
2425bcb9 | 2024 | struct trace_event_call *call, *p; |
575380da | 2025 | bool clear_trace = false; |
6d723736 | 2026 | |
52f6ad6d | 2027 | down_write(&trace_event_sem); |
6d723736 SR |
2028 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
2029 | if (call->mod == mod) { | |
575380da SRRH |
2030 | if (call->flags & TRACE_EVENT_FL_WAS_ENABLED) |
2031 | clear_trace = true; | |
bd1a5c84 | 2032 | __trace_remove_event_call(call); |
6d723736 SR |
2033 | } |
2034 | } | |
52f6ad6d | 2035 | up_write(&trace_event_sem); |
9456f0fa SR |
2036 | |
2037 | /* | |
2038 | * It is safest to reset the ring buffer if the module being unloaded | |
873c642f SRRH |
2039 | * registered any events that were used. The only worry is if |
2040 | * a new module gets loaded, and takes on the same id as the events | |
2041 | * of this module. When printing out the buffer, traced events left | |
2042 | * over from this module may be passed to the new module events and | |
2043 | * unexpected results may occur. | |
9456f0fa | 2044 | */ |
575380da | 2045 | if (clear_trace) |
873c642f | 2046 | tracing_reset_all_online_cpus(); |
6d723736 SR |
2047 | } |
2048 | ||
61f919a1 SR |
2049 | static int trace_module_notify(struct notifier_block *self, |
2050 | unsigned long val, void *data) | |
6d723736 SR |
2051 | { |
2052 | struct module *mod = data; | |
2053 | ||
a8227415 | 2054 | mutex_lock(&trace_types_lock); |
6d723736 SR |
2055 | mutex_lock(&event_mutex); |
2056 | switch (val) { | |
2057 | case MODULE_STATE_COMING: | |
2058 | trace_module_add_events(mod); | |
2059 | break; | |
2060 | case MODULE_STATE_GOING: | |
2061 | trace_module_remove_events(mod); | |
2062 | break; | |
2063 | } | |
2064 | mutex_unlock(&event_mutex); | |
a8227415 | 2065 | mutex_unlock(&trace_types_lock); |
fd994989 | 2066 | |
1473e441 SR |
2067 | return 0; |
2068 | } | |
315326c1 | 2069 | |
836d481e ON |
2070 | static struct notifier_block trace_module_nb = { |
2071 | .notifier_call = trace_module_notify, | |
3673b8e4 | 2072 | .priority = 1, /* higher than trace.c module notify */ |
836d481e | 2073 | }; |
61f919a1 | 2074 | #endif /* CONFIG_MODULES */ |
1473e441 | 2075 | |
ae63b31e SR |
2076 | /* Create a new event directory structure for a trace directory. */ |
2077 | static void | |
2078 | __trace_add_event_dirs(struct trace_array *tr) | |
2079 | { | |
2425bcb9 | 2080 | struct trace_event_call *call; |
ae63b31e SR |
2081 | int ret; |
2082 | ||
2083 | list_for_each_entry(call, &ftrace_events, list) { | |
620a30e9 | 2084 | ret = __trace_add_new_event(call, tr); |
ae63b31e | 2085 | if (ret < 0) |
3448bac3 | 2086 | pr_warn("Could not create directory for event %s\n", |
687fcc4a | 2087 | trace_event_name(call)); |
ae63b31e SR |
2088 | } |
2089 | } | |
2090 | ||
7f1d2f82 | 2091 | struct trace_event_file * |
3cd715de SRRH |
2092 | find_event_file(struct trace_array *tr, const char *system, const char *event) |
2093 | { | |
7f1d2f82 | 2094 | struct trace_event_file *file; |
2425bcb9 | 2095 | struct trace_event_call *call; |
de7b2973 | 2096 | const char *name; |
3cd715de SRRH |
2097 | |
2098 | list_for_each_entry(file, &tr->events, list) { | |
2099 | ||
2100 | call = file->event_call; | |
687fcc4a | 2101 | name = trace_event_name(call); |
3cd715de | 2102 | |
de7b2973 | 2103 | if (!name || !call->class || !call->class->reg) |
3cd715de SRRH |
2104 | continue; |
2105 | ||
2106 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) | |
2107 | continue; | |
2108 | ||
de7b2973 | 2109 | if (strcmp(event, name) == 0 && |
3cd715de SRRH |
2110 | strcmp(system, call->class->system) == 0) |
2111 | return file; | |
2112 | } | |
2113 | return NULL; | |
2114 | } | |
2115 | ||
2875a08b SRRH |
2116 | #ifdef CONFIG_DYNAMIC_FTRACE |
2117 | ||
2118 | /* Avoid typos */ | |
2119 | #define ENABLE_EVENT_STR "enable_event" | |
2120 | #define DISABLE_EVENT_STR "disable_event" | |
2121 | ||
2122 | struct event_probe_data { | |
7f1d2f82 | 2123 | struct trace_event_file *file; |
2875a08b SRRH |
2124 | unsigned long count; |
2125 | int ref; | |
2126 | bool enable; | |
2127 | }; | |
2128 | ||
3cd715de SRRH |
2129 | static void |
2130 | event_enable_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
2131 | { | |
2132 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2133 | struct event_probe_data *data = *pdata; | |
2134 | ||
2135 | if (!data) | |
2136 | return; | |
2137 | ||
2138 | if (data->enable) | |
5d6ad960 | 2139 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); |
3cd715de | 2140 | else |
5d6ad960 | 2141 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); |
3cd715de SRRH |
2142 | } |
2143 | ||
2144 | static void | |
2145 | event_enable_count_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
2146 | { | |
2147 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2148 | struct event_probe_data *data = *pdata; | |
2149 | ||
2150 | if (!data) | |
2151 | return; | |
2152 | ||
2153 | if (!data->count) | |
2154 | return; | |
2155 | ||
2156 | /* Skip if the event is in a state we want to switch to */ | |
5d6ad960 | 2157 | if (data->enable == !(data->file->flags & EVENT_FILE_FL_SOFT_DISABLED)) |
3cd715de SRRH |
2158 | return; |
2159 | ||
2160 | if (data->count != -1) | |
2161 | (data->count)--; | |
2162 | ||
2163 | event_enable_probe(ip, parent_ip, _data); | |
2164 | } | |
2165 | ||
2166 | static int | |
2167 | event_enable_print(struct seq_file *m, unsigned long ip, | |
2168 | struct ftrace_probe_ops *ops, void *_data) | |
2169 | { | |
2170 | struct event_probe_data *data = _data; | |
2171 | ||
2172 | seq_printf(m, "%ps:", (void *)ip); | |
2173 | ||
2174 | seq_printf(m, "%s:%s:%s", | |
2175 | data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR, | |
2176 | data->file->event_call->class->system, | |
687fcc4a | 2177 | trace_event_name(data->file->event_call)); |
3cd715de SRRH |
2178 | |
2179 | if (data->count == -1) | |
fa6f0cc7 | 2180 | seq_puts(m, ":unlimited\n"); |
3cd715de SRRH |
2181 | else |
2182 | seq_printf(m, ":count=%ld\n", data->count); | |
2183 | ||
2184 | return 0; | |
2185 | } | |
2186 | ||
2187 | static int | |
2188 | event_enable_init(struct ftrace_probe_ops *ops, unsigned long ip, | |
2189 | void **_data) | |
2190 | { | |
2191 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2192 | struct event_probe_data *data = *pdata; | |
2193 | ||
2194 | data->ref++; | |
2195 | return 0; | |
2196 | } | |
2197 | ||
2198 | static void | |
2199 | event_enable_free(struct ftrace_probe_ops *ops, unsigned long ip, | |
2200 | void **_data) | |
2201 | { | |
2202 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2203 | struct event_probe_data *data = *pdata; | |
2204 | ||
2205 | if (WARN_ON_ONCE(data->ref <= 0)) | |
2206 | return; | |
2207 | ||
2208 | data->ref--; | |
2209 | if (!data->ref) { | |
2210 | /* Remove the SOFT_MODE flag */ | |
2211 | __ftrace_event_enable_disable(data->file, 0, 1); | |
2212 | module_put(data->file->event_call->mod); | |
2213 | kfree(data); | |
2214 | } | |
2215 | *pdata = NULL; | |
2216 | } | |
2217 | ||
2218 | static struct ftrace_probe_ops event_enable_probe_ops = { | |
2219 | .func = event_enable_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_enable_count_probe_ops = { | |
2226 | .func = event_enable_count_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_probe_ops = { | |
2233 | .func = event_enable_probe, | |
2234 | .print = event_enable_print, | |
2235 | .init = event_enable_init, | |
2236 | .free = event_enable_free, | |
2237 | }; | |
2238 | ||
2239 | static struct ftrace_probe_ops event_disable_count_probe_ops = { | |
2240 | .func = event_enable_count_probe, | |
2241 | .print = event_enable_print, | |
2242 | .init = event_enable_init, | |
2243 | .free = event_enable_free, | |
2244 | }; | |
2245 | ||
2246 | static int | |
2247 | event_enable_func(struct ftrace_hash *hash, | |
2248 | char *glob, char *cmd, char *param, int enabled) | |
2249 | { | |
2250 | struct trace_array *tr = top_trace_array(); | |
7f1d2f82 | 2251 | struct trace_event_file *file; |
3cd715de SRRH |
2252 | struct ftrace_probe_ops *ops; |
2253 | struct event_probe_data *data; | |
2254 | const char *system; | |
2255 | const char *event; | |
2256 | char *number; | |
2257 | bool enable; | |
2258 | int ret; | |
2259 | ||
dc81e5e3 YY |
2260 | if (!tr) |
2261 | return -ENODEV; | |
2262 | ||
3cd715de | 2263 | /* hash funcs only work with set_ftrace_filter */ |
8092e808 | 2264 | if (!enabled || !param) |
3cd715de SRRH |
2265 | return -EINVAL; |
2266 | ||
2267 | system = strsep(¶m, ":"); | |
2268 | if (!param) | |
2269 | return -EINVAL; | |
2270 | ||
2271 | event = strsep(¶m, ":"); | |
2272 | ||
2273 | mutex_lock(&event_mutex); | |
2274 | ||
2275 | ret = -EINVAL; | |
2276 | file = find_event_file(tr, system, event); | |
2277 | if (!file) | |
2278 | goto out; | |
2279 | ||
2280 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; | |
2281 | ||
2282 | if (enable) | |
2283 | ops = param ? &event_enable_count_probe_ops : &event_enable_probe_ops; | |
2284 | else | |
2285 | ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops; | |
2286 | ||
2287 | if (glob[0] == '!') { | |
2288 | unregister_ftrace_function_probe_func(glob+1, ops); | |
2289 | ret = 0; | |
2290 | goto out; | |
2291 | } | |
2292 | ||
2293 | ret = -ENOMEM; | |
2294 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
2295 | if (!data) | |
2296 | goto out; | |
2297 | ||
2298 | data->enable = enable; | |
2299 | data->count = -1; | |
2300 | data->file = file; | |
2301 | ||
2302 | if (!param) | |
2303 | goto out_reg; | |
2304 | ||
2305 | number = strsep(¶m, ":"); | |
2306 | ||
2307 | ret = -EINVAL; | |
2308 | if (!strlen(number)) | |
2309 | goto out_free; | |
2310 | ||
2311 | /* | |
2312 | * We use the callback data field (which is a pointer) | |
2313 | * as our counter. | |
2314 | */ | |
2315 | ret = kstrtoul(number, 0, &data->count); | |
2316 | if (ret) | |
2317 | goto out_free; | |
2318 | ||
2319 | out_reg: | |
2320 | /* Don't let event modules unload while probe registered */ | |
2321 | ret = try_module_get(file->event_call->mod); | |
6ed01066 MH |
2322 | if (!ret) { |
2323 | ret = -EBUSY; | |
3cd715de | 2324 | goto out_free; |
6ed01066 | 2325 | } |
3cd715de SRRH |
2326 | |
2327 | ret = __ftrace_event_enable_disable(file, 1, 1); | |
2328 | if (ret < 0) | |
2329 | goto out_put; | |
2330 | ret = register_ftrace_function_probe(glob, ops, data); | |
ff305ded SRRH |
2331 | /* |
2332 | * The above returns on success the # of functions enabled, | |
2333 | * but if it didn't find any functions it returns zero. | |
2334 | * Consider no functions a failure too. | |
2335 | */ | |
a5b85bd1 MH |
2336 | if (!ret) { |
2337 | ret = -ENOENT; | |
3cd715de | 2338 | goto out_disable; |
ff305ded SRRH |
2339 | } else if (ret < 0) |
2340 | goto out_disable; | |
2341 | /* Just return zero, not the number of enabled functions */ | |
2342 | ret = 0; | |
3cd715de SRRH |
2343 | out: |
2344 | mutex_unlock(&event_mutex); | |
2345 | return ret; | |
2346 | ||
2347 | out_disable: | |
2348 | __ftrace_event_enable_disable(file, 0, 1); | |
2349 | out_put: | |
2350 | module_put(file->event_call->mod); | |
2351 | out_free: | |
2352 | kfree(data); | |
2353 | goto out; | |
2354 | } | |
2355 | ||
2356 | static struct ftrace_func_command event_enable_cmd = { | |
2357 | .name = ENABLE_EVENT_STR, | |
2358 | .func = event_enable_func, | |
2359 | }; | |
2360 | ||
2361 | static struct ftrace_func_command event_disable_cmd = { | |
2362 | .name = DISABLE_EVENT_STR, | |
2363 | .func = event_enable_func, | |
2364 | }; | |
2365 | ||
2366 | static __init int register_event_cmds(void) | |
2367 | { | |
2368 | int ret; | |
2369 | ||
2370 | ret = register_ftrace_command(&event_enable_cmd); | |
2371 | if (WARN_ON(ret < 0)) | |
2372 | return ret; | |
2373 | ret = register_ftrace_command(&event_disable_cmd); | |
2374 | if (WARN_ON(ret < 0)) | |
2375 | unregister_ftrace_command(&event_enable_cmd); | |
2376 | return ret; | |
2377 | } | |
2378 | #else | |
2379 | static inline int register_event_cmds(void) { return 0; } | |
2380 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
2381 | ||
77248221 | 2382 | /* |
7f1d2f82 | 2383 | * The top level array has already had its trace_event_file |
77248221 | 2384 | * descriptors created in order to allow for early events to |
8434dc93 | 2385 | * be recorded. This function is called after the tracefs has been |
77248221 SR |
2386 | * initialized, and we now have to create the files associated |
2387 | * to the events. | |
2388 | */ | |
2389 | static __init void | |
2390 | __trace_early_add_event_dirs(struct trace_array *tr) | |
2391 | { | |
7f1d2f82 | 2392 | struct trace_event_file *file; |
77248221 SR |
2393 | int ret; |
2394 | ||
2395 | ||
2396 | list_for_each_entry(file, &tr->events, list) { | |
620a30e9 | 2397 | ret = event_create_dir(tr->event_dir, file); |
77248221 | 2398 | if (ret < 0) |
3448bac3 | 2399 | pr_warn("Could not create directory for event %s\n", |
687fcc4a | 2400 | trace_event_name(file->event_call)); |
77248221 SR |
2401 | } |
2402 | } | |
2403 | ||
2404 | /* | |
2405 | * For early boot up, the top trace array requires to have | |
2406 | * a list of events that can be enabled. This must be done before | |
2407 | * the filesystem is set up in order to allow events to be traced | |
2408 | * early. | |
2409 | */ | |
2410 | static __init void | |
2411 | __trace_early_add_events(struct trace_array *tr) | |
2412 | { | |
2425bcb9 | 2413 | struct trace_event_call *call; |
77248221 SR |
2414 | int ret; |
2415 | ||
2416 | list_for_each_entry(call, &ftrace_events, list) { | |
2417 | /* Early boot up should not have any modules loaded */ | |
2418 | if (WARN_ON_ONCE(call->mod)) | |
2419 | continue; | |
2420 | ||
2421 | ret = __trace_early_add_new_event(call, tr); | |
2422 | if (ret < 0) | |
3448bac3 | 2423 | pr_warn("Could not create early event %s\n", |
687fcc4a | 2424 | trace_event_name(call)); |
77248221 SR |
2425 | } |
2426 | } | |
2427 | ||
0c8916c3 SR |
2428 | /* Remove the event directory structure for a trace directory. */ |
2429 | static void | |
2430 | __trace_remove_event_dirs(struct trace_array *tr) | |
2431 | { | |
7f1d2f82 | 2432 | struct trace_event_file *file, *next; |
0c8916c3 | 2433 | |
f6a84bdc ON |
2434 | list_for_each_entry_safe(file, next, &tr->events, list) |
2435 | remove_event_file_dir(file); | |
0c8916c3 SR |
2436 | } |
2437 | ||
2425bcb9 | 2438 | static void __add_event_to_tracers(struct trace_event_call *call) |
ae63b31e SR |
2439 | { |
2440 | struct trace_array *tr; | |
2441 | ||
620a30e9 ON |
2442 | list_for_each_entry(tr, &ftrace_trace_arrays, list) |
2443 | __trace_add_new_event(call, tr); | |
ae63b31e SR |
2444 | } |
2445 | ||
2425bcb9 SRRH |
2446 | extern struct trace_event_call *__start_ftrace_events[]; |
2447 | extern struct trace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 2448 | |
020e5f85 LZ |
2449 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
2450 | ||
2451 | static __init int setup_trace_event(char *str) | |
2452 | { | |
2453 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
55034cd6 SRRH |
2454 | ring_buffer_expanded = true; |
2455 | tracing_selftest_disabled = true; | |
020e5f85 LZ |
2456 | |
2457 | return 1; | |
2458 | } | |
2459 | __setup("trace_event=", setup_trace_event); | |
2460 | ||
77248221 SR |
2461 | /* Expects to have event_mutex held when called */ |
2462 | static int | |
2463 | create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) | |
ae63b31e SR |
2464 | { |
2465 | struct dentry *d_events; | |
2466 | struct dentry *entry; | |
2467 | ||
8434dc93 | 2468 | entry = tracefs_create_file("set_event", 0644, parent, |
ae63b31e SR |
2469 | tr, &ftrace_set_event_fops); |
2470 | if (!entry) { | |
8434dc93 | 2471 | pr_warn("Could not create tracefs 'set_event' entry\n"); |
ae63b31e SR |
2472 | return -ENOMEM; |
2473 | } | |
2474 | ||
8434dc93 | 2475 | d_events = tracefs_create_dir("events", parent); |
277ba044 | 2476 | if (!d_events) { |
8434dc93 | 2477 | pr_warn("Could not create tracefs 'events' directory\n"); |
277ba044 SR |
2478 | return -ENOMEM; |
2479 | } | |
ae63b31e SR |
2480 | |
2481 | /* ring buffer internal formats */ | |
2482 | trace_create_file("header_page", 0444, d_events, | |
2483 | ring_buffer_print_page_header, | |
2484 | &ftrace_show_header_fops); | |
2485 | ||
2486 | trace_create_file("header_event", 0444, d_events, | |
2487 | ring_buffer_print_entry_header, | |
2488 | &ftrace_show_header_fops); | |
2489 | ||
2490 | trace_create_file("enable", 0644, d_events, | |
2491 | tr, &ftrace_tr_enable_fops); | |
2492 | ||
2493 | tr->event_dir = d_events; | |
77248221 SR |
2494 | |
2495 | return 0; | |
2496 | } | |
2497 | ||
2498 | /** | |
2499 | * event_trace_add_tracer - add a instance of a trace_array to events | |
2500 | * @parent: The parent dentry to place the files/directories for events in | |
2501 | * @tr: The trace array associated with these events | |
2502 | * | |
2503 | * When a new instance is created, it needs to set up its events | |
2504 | * directory, as well as other files associated with events. It also | |
2505 | * creates the event hierachry in the @parent/events directory. | |
2506 | * | |
2507 | * Returns 0 on success. | |
2508 | */ | |
2509 | int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2510 | { | |
2511 | int ret; | |
2512 | ||
2513 | mutex_lock(&event_mutex); | |
2514 | ||
2515 | ret = create_event_toplevel_files(parent, tr); | |
2516 | if (ret) | |
2517 | goto out_unlock; | |
2518 | ||
52f6ad6d | 2519 | down_write(&trace_event_sem); |
ae63b31e | 2520 | __trace_add_event_dirs(tr); |
52f6ad6d | 2521 | up_write(&trace_event_sem); |
277ba044 | 2522 | |
77248221 | 2523 | out_unlock: |
277ba044 | 2524 | mutex_unlock(&event_mutex); |
ae63b31e | 2525 | |
77248221 SR |
2526 | return ret; |
2527 | } | |
2528 | ||
2529 | /* | |
2530 | * The top trace array already had its file descriptors created. | |
2531 | * Now the files themselves need to be created. | |
2532 | */ | |
2533 | static __init int | |
2534 | early_event_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2535 | { | |
2536 | int ret; | |
2537 | ||
2538 | mutex_lock(&event_mutex); | |
2539 | ||
2540 | ret = create_event_toplevel_files(parent, tr); | |
2541 | if (ret) | |
2542 | goto out_unlock; | |
2543 | ||
52f6ad6d | 2544 | down_write(&trace_event_sem); |
77248221 | 2545 | __trace_early_add_event_dirs(tr); |
52f6ad6d | 2546 | up_write(&trace_event_sem); |
77248221 SR |
2547 | |
2548 | out_unlock: | |
2549 | mutex_unlock(&event_mutex); | |
2550 | ||
2551 | return ret; | |
ae63b31e SR |
2552 | } |
2553 | ||
0c8916c3 SR |
2554 | int event_trace_del_tracer(struct trace_array *tr) |
2555 | { | |
0c8916c3 SR |
2556 | mutex_lock(&event_mutex); |
2557 | ||
85f2b082 TZ |
2558 | /* Disable any event triggers and associated soft-disabled events */ |
2559 | clear_event_triggers(tr); | |
2560 | ||
2a6c24af SRRH |
2561 | /* Disable any running events */ |
2562 | __ftrace_set_clr_event_nolock(tr, NULL, NULL, NULL, 0); | |
2563 | ||
3ccb0123 SR |
2564 | /* Access to events are within rcu_read_lock_sched() */ |
2565 | synchronize_sched(); | |
2566 | ||
52f6ad6d | 2567 | down_write(&trace_event_sem); |
0c8916c3 | 2568 | __trace_remove_event_dirs(tr); |
8434dc93 | 2569 | tracefs_remove_recursive(tr->event_dir); |
52f6ad6d | 2570 | up_write(&trace_event_sem); |
0c8916c3 SR |
2571 | |
2572 | tr->event_dir = NULL; | |
2573 | ||
2574 | mutex_unlock(&event_mutex); | |
2575 | ||
2576 | return 0; | |
2577 | } | |
2578 | ||
d1a29143 SR |
2579 | static __init int event_trace_memsetup(void) |
2580 | { | |
2581 | field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); | |
7f1d2f82 | 2582 | file_cachep = KMEM_CACHE(trace_event_file, SLAB_PANIC); |
d1a29143 SR |
2583 | return 0; |
2584 | } | |
2585 | ||
ce1039bd SRRH |
2586 | static __init void |
2587 | early_enable_events(struct trace_array *tr, bool disable_first) | |
2588 | { | |
2589 | char *buf = bootup_event_buf; | |
2590 | char *token; | |
2591 | int ret; | |
2592 | ||
2593 | while (true) { | |
2594 | token = strsep(&buf, ","); | |
2595 | ||
2596 | if (!token) | |
2597 | break; | |
2598 | if (!*token) | |
2599 | continue; | |
2600 | ||
2601 | /* Restarting syscalls requires that we stop them first */ | |
2602 | if (disable_first) | |
2603 | ftrace_set_clr_event(tr, token, 0); | |
2604 | ||
2605 | ret = ftrace_set_clr_event(tr, token, 1); | |
2606 | if (ret) | |
2607 | pr_warn("Failed to enable trace event: %s\n", token); | |
2608 | ||
2609 | /* Put back the comma to allow this to be called again */ | |
2610 | if (buf) | |
2611 | *(buf - 1) = ','; | |
2612 | } | |
2613 | } | |
2614 | ||
8781915a EG |
2615 | static __init int event_trace_enable(void) |
2616 | { | |
ae63b31e | 2617 | struct trace_array *tr = top_trace_array(); |
2425bcb9 | 2618 | struct trace_event_call **iter, *call; |
8781915a EG |
2619 | int ret; |
2620 | ||
dc81e5e3 YY |
2621 | if (!tr) |
2622 | return -ENODEV; | |
2623 | ||
8781915a EG |
2624 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { |
2625 | ||
2626 | call = *iter; | |
2627 | ret = event_init(call); | |
2628 | if (!ret) | |
2629 | list_add(&call->list, &ftrace_events); | |
2630 | } | |
2631 | ||
77248221 SR |
2632 | /* |
2633 | * We need the top trace array to have a working set of trace | |
2634 | * points at early init, before the debug files and directories | |
2635 | * are created. Create the file entries now, and attach them | |
2636 | * to the actual file dentries later. | |
2637 | */ | |
2638 | __trace_early_add_events(tr); | |
2639 | ||
ce1039bd | 2640 | early_enable_events(tr, false); |
81698831 SR |
2641 | |
2642 | trace_printk_start_comm(); | |
2643 | ||
3cd715de SRRH |
2644 | register_event_cmds(); |
2645 | ||
85f2b082 TZ |
2646 | register_trigger_cmds(); |
2647 | ||
8781915a EG |
2648 | return 0; |
2649 | } | |
2650 | ||
ce1039bd SRRH |
2651 | /* |
2652 | * event_trace_enable() is called from trace_event_init() first to | |
2653 | * initialize events and perhaps start any events that are on the | |
2654 | * command line. Unfortunately, there are some events that will not | |
2655 | * start this early, like the system call tracepoints that need | |
2656 | * to set the TIF_SYSCALL_TRACEPOINT flag of pid 1. But event_trace_enable() | |
2657 | * is called before pid 1 starts, and this flag is never set, making | |
2658 | * the syscall tracepoint never get reached, but the event is enabled | |
2659 | * regardless (and not doing anything). | |
2660 | */ | |
2661 | static __init int event_trace_enable_again(void) | |
2662 | { | |
2663 | struct trace_array *tr; | |
2664 | ||
2665 | tr = top_trace_array(); | |
2666 | if (!tr) | |
2667 | return -ENODEV; | |
2668 | ||
2669 | early_enable_events(tr, true); | |
2670 | ||
2671 | return 0; | |
2672 | } | |
2673 | ||
2674 | early_initcall(event_trace_enable_again); | |
2675 | ||
b77e38aa SR |
2676 | static __init int event_trace_init(void) |
2677 | { | |
ae63b31e | 2678 | struct trace_array *tr; |
b77e38aa SR |
2679 | struct dentry *d_tracer; |
2680 | struct dentry *entry; | |
6d723736 | 2681 | int ret; |
b77e38aa | 2682 | |
ae63b31e | 2683 | tr = top_trace_array(); |
dc81e5e3 YY |
2684 | if (!tr) |
2685 | return -ENODEV; | |
ae63b31e | 2686 | |
b77e38aa | 2687 | d_tracer = tracing_init_dentry(); |
14a5ae40 | 2688 | if (IS_ERR(d_tracer)) |
b77e38aa SR |
2689 | return 0; |
2690 | ||
8434dc93 | 2691 | entry = tracefs_create_file("available_events", 0444, d_tracer, |
ae63b31e | 2692 | tr, &ftrace_avail_fops); |
2314c4ae | 2693 | if (!entry) |
8434dc93 | 2694 | pr_warn("Could not create tracefs 'available_events' entry\n"); |
2314c4ae | 2695 | |
9f616680 DW |
2696 | if (trace_define_generic_fields()) |
2697 | pr_warn("tracing: Failed to allocated generic fields"); | |
2698 | ||
8728fe50 | 2699 | if (trace_define_common_fields()) |
3448bac3 | 2700 | pr_warn("tracing: Failed to allocate common fields"); |
8728fe50 | 2701 | |
77248221 | 2702 | ret = early_event_add_tracer(d_tracer, tr); |
ae63b31e SR |
2703 | if (ret) |
2704 | return ret; | |
020e5f85 | 2705 | |
836d481e | 2706 | #ifdef CONFIG_MODULES |
6d723736 | 2707 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 2708 | if (ret) |
3448bac3 | 2709 | pr_warn("Failed to register trace events module notifier\n"); |
836d481e | 2710 | #endif |
b77e38aa SR |
2711 | return 0; |
2712 | } | |
5f893b26 SRRH |
2713 | |
2714 | void __init trace_event_init(void) | |
2715 | { | |
2716 | event_trace_memsetup(); | |
2717 | init_ftrace_syscalls(); | |
2718 | event_trace_enable(); | |
2719 | } | |
2720 | ||
b77e38aa | 2721 | fs_initcall(event_trace_init); |
e6187007 SR |
2722 | |
2723 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
2724 | ||
2725 | static DEFINE_SPINLOCK(test_spinlock); | |
2726 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
2727 | static DEFINE_MUTEX(test_mutex); | |
2728 | ||
2729 | static __init void test_work(struct work_struct *dummy) | |
2730 | { | |
2731 | spin_lock(&test_spinlock); | |
2732 | spin_lock_irq(&test_spinlock_irq); | |
2733 | udelay(1); | |
2734 | spin_unlock_irq(&test_spinlock_irq); | |
2735 | spin_unlock(&test_spinlock); | |
2736 | ||
2737 | mutex_lock(&test_mutex); | |
2738 | msleep(1); | |
2739 | mutex_unlock(&test_mutex); | |
2740 | } | |
2741 | ||
2742 | static __init int event_test_thread(void *unused) | |
2743 | { | |
2744 | void *test_malloc; | |
2745 | ||
2746 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
2747 | if (!test_malloc) | |
2748 | pr_info("failed to kmalloc\n"); | |
2749 | ||
2750 | schedule_on_each_cpu(test_work); | |
2751 | ||
2752 | kfree(test_malloc); | |
2753 | ||
2754 | set_current_state(TASK_INTERRUPTIBLE); | |
fe0e01c7 | 2755 | while (!kthread_should_stop()) { |
e6187007 | 2756 | schedule(); |
fe0e01c7 PZ |
2757 | set_current_state(TASK_INTERRUPTIBLE); |
2758 | } | |
2759 | __set_current_state(TASK_RUNNING); | |
e6187007 SR |
2760 | |
2761 | return 0; | |
2762 | } | |
2763 | ||
2764 | /* | |
2765 | * Do various things that may trigger events. | |
2766 | */ | |
2767 | static __init void event_test_stuff(void) | |
2768 | { | |
2769 | struct task_struct *test_thread; | |
2770 | ||
2771 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
2772 | msleep(1); | |
2773 | kthread_stop(test_thread); | |
2774 | } | |
2775 | ||
2776 | /* | |
2777 | * For every trace event defined, we will test each trace point separately, | |
2778 | * and then by groups, and finally all trace points. | |
2779 | */ | |
9ea21c1e | 2780 | static __init void event_trace_self_tests(void) |
e6187007 | 2781 | { |
7967b3e0 | 2782 | struct trace_subsystem_dir *dir; |
7f1d2f82 | 2783 | struct trace_event_file *file; |
2425bcb9 | 2784 | struct trace_event_call *call; |
e6187007 | 2785 | struct event_subsystem *system; |
ae63b31e | 2786 | struct trace_array *tr; |
e6187007 SR |
2787 | int ret; |
2788 | ||
ae63b31e | 2789 | tr = top_trace_array(); |
dc81e5e3 YY |
2790 | if (!tr) |
2791 | return; | |
ae63b31e | 2792 | |
e6187007 SR |
2793 | pr_info("Running tests on trace events:\n"); |
2794 | ||
ae63b31e SR |
2795 | list_for_each_entry(file, &tr->events, list) { |
2796 | ||
2797 | call = file->event_call; | |
e6187007 | 2798 | |
2239291a SR |
2799 | /* Only test those that have a probe */ |
2800 | if (!call->class || !call->class->probe) | |
e6187007 SR |
2801 | continue; |
2802 | ||
1f5a6b45 SR |
2803 | /* |
2804 | * Testing syscall events here is pretty useless, but | |
2805 | * we still do it if configured. But this is time consuming. | |
2806 | * What we really need is a user thread to perform the | |
2807 | * syscalls as we test. | |
2808 | */ | |
2809 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
2810 | if (call->class->system && |
2811 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
2812 | continue; |
2813 | #endif | |
2814 | ||
687fcc4a | 2815 | pr_info("Testing event %s: ", trace_event_name(call)); |
e6187007 SR |
2816 | |
2817 | /* | |
2818 | * If an event is already enabled, someone is using | |
2819 | * it and the self test should not be on. | |
2820 | */ | |
5d6ad960 | 2821 | if (file->flags & EVENT_FILE_FL_ENABLED) { |
3448bac3 | 2822 | pr_warn("Enabled event during self test!\n"); |
e6187007 SR |
2823 | WARN_ON_ONCE(1); |
2824 | continue; | |
2825 | } | |
2826 | ||
ae63b31e | 2827 | ftrace_event_enable_disable(file, 1); |
e6187007 | 2828 | event_test_stuff(); |
ae63b31e | 2829 | ftrace_event_enable_disable(file, 0); |
e6187007 SR |
2830 | |
2831 | pr_cont("OK\n"); | |
2832 | } | |
2833 | ||
2834 | /* Now test at the sub system level */ | |
2835 | ||
2836 | pr_info("Running tests on trace event systems:\n"); | |
2837 | ||
ae63b31e SR |
2838 | list_for_each_entry(dir, &tr->systems, list) { |
2839 | ||
2840 | system = dir->subsystem; | |
e6187007 SR |
2841 | |
2842 | /* the ftrace system is special, skip it */ | |
2843 | if (strcmp(system->name, "ftrace") == 0) | |
2844 | continue; | |
2845 | ||
2846 | pr_info("Testing event system %s: ", system->name); | |
2847 | ||
ae63b31e | 2848 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
e6187007 | 2849 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
2850 | pr_warn("error enabling system %s\n", |
2851 | system->name); | |
e6187007 SR |
2852 | continue; |
2853 | } | |
2854 | ||
2855 | event_test_stuff(); | |
2856 | ||
ae63b31e | 2857 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
76bab1b7 | 2858 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
2859 | pr_warn("error disabling system %s\n", |
2860 | system->name); | |
76bab1b7 YL |
2861 | continue; |
2862 | } | |
e6187007 SR |
2863 | |
2864 | pr_cont("OK\n"); | |
2865 | } | |
2866 | ||
2867 | /* Test with all events enabled */ | |
2868 | ||
2869 | pr_info("Running tests on all trace events:\n"); | |
2870 | pr_info("Testing all events: "); | |
2871 | ||
ae63b31e | 2872 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
e6187007 | 2873 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 2874 | pr_warn("error enabling all events\n"); |
9ea21c1e | 2875 | return; |
e6187007 SR |
2876 | } |
2877 | ||
2878 | event_test_stuff(); | |
2879 | ||
2880 | /* reset sysname */ | |
ae63b31e | 2881 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
e6187007 | 2882 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 2883 | pr_warn("error disabling all events\n"); |
9ea21c1e | 2884 | return; |
e6187007 SR |
2885 | } |
2886 | ||
2887 | pr_cont("OK\n"); | |
9ea21c1e SR |
2888 | } |
2889 | ||
2890 | #ifdef CONFIG_FUNCTION_TRACER | |
2891 | ||
245b2e70 | 2892 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e SR |
2893 | |
2894 | static void | |
2f5f6ad9 | 2895 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 2896 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
9ea21c1e SR |
2897 | { |
2898 | struct ring_buffer_event *event; | |
e77405ad | 2899 | struct ring_buffer *buffer; |
9ea21c1e SR |
2900 | struct ftrace_entry *entry; |
2901 | unsigned long flags; | |
2902 | long disabled; | |
9ea21c1e SR |
2903 | int cpu; |
2904 | int pc; | |
2905 | ||
2906 | pc = preempt_count(); | |
5168ae50 | 2907 | preempt_disable_notrace(); |
9ea21c1e | 2908 | cpu = raw_smp_processor_id(); |
245b2e70 | 2909 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
2910 | |
2911 | if (disabled != 1) | |
2912 | goto out; | |
2913 | ||
2914 | local_save_flags(flags); | |
2915 | ||
e77405ad SR |
2916 | event = trace_current_buffer_lock_reserve(&buffer, |
2917 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
2918 | flags, pc); |
2919 | if (!event) | |
2920 | goto out; | |
2921 | entry = ring_buffer_event_data(event); | |
2922 | entry->ip = ip; | |
2923 | entry->parent_ip = parent_ip; | |
2924 | ||
0d5c6e1c | 2925 | trace_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
2926 | |
2927 | out: | |
245b2e70 | 2928 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 2929 | preempt_enable_notrace(); |
9ea21c1e SR |
2930 | } |
2931 | ||
2932 | static struct ftrace_ops trace_ops __initdata = | |
2933 | { | |
2934 | .func = function_test_events_call, | |
4740974a | 2935 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
9ea21c1e SR |
2936 | }; |
2937 | ||
2938 | static __init void event_trace_self_test_with_function(void) | |
2939 | { | |
17bb615a SR |
2940 | int ret; |
2941 | ret = register_ftrace_function(&trace_ops); | |
2942 | if (WARN_ON(ret < 0)) { | |
2943 | pr_info("Failed to enable function tracer for event tests\n"); | |
2944 | return; | |
2945 | } | |
9ea21c1e SR |
2946 | pr_info("Running tests again, along with the function tracer\n"); |
2947 | event_trace_self_tests(); | |
2948 | unregister_ftrace_function(&trace_ops); | |
2949 | } | |
2950 | #else | |
2951 | static __init void event_trace_self_test_with_function(void) | |
2952 | { | |
2953 | } | |
2954 | #endif | |
2955 | ||
2956 | static __init int event_trace_self_tests_init(void) | |
2957 | { | |
020e5f85 LZ |
2958 | if (!tracing_selftest_disabled) { |
2959 | event_trace_self_tests(); | |
2960 | event_trace_self_test_with_function(); | |
2961 | } | |
e6187007 SR |
2962 | |
2963 | return 0; | |
2964 | } | |
2965 | ||
28d20e2d | 2966 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
2967 | |
2968 | #endif |