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 | 17 | #include <linux/uaccess.h> |
f4d34a87 | 18 | #include <linux/vmalloc.h> |
b77e38aa SR |
19 | #include <linux/module.h> |
20 | #include <linux/ctype.h> | |
49090107 | 21 | #include <linux/sort.h> |
5a0e3ad6 | 22 | #include <linux/slab.h> |
e6187007 | 23 | #include <linux/delay.h> |
b77e38aa | 24 | |
3fdaf80f SRRH |
25 | #include <trace/events/sched.h> |
26 | ||
020e5f85 LZ |
27 | #include <asm/setup.h> |
28 | ||
91729ef9 | 29 | #include "trace_output.h" |
b77e38aa | 30 | |
4e5292ea | 31 | #undef TRACE_SYSTEM |
b628b3e6 SR |
32 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
33 | ||
20c8928a | 34 | DEFINE_MUTEX(event_mutex); |
11a241a3 | 35 | |
a59fd602 | 36 | LIST_HEAD(ftrace_events); |
9f616680 | 37 | static LIST_HEAD(ftrace_generic_fields); |
b3a8c6fd | 38 | static LIST_HEAD(ftrace_common_fields); |
a59fd602 | 39 | |
d1a29143 SR |
40 | #define GFP_TRACE (GFP_KERNEL | __GFP_ZERO) |
41 | ||
42 | static struct kmem_cache *field_cachep; | |
43 | static struct kmem_cache *file_cachep; | |
44 | ||
6e94a780 SR |
45 | static inline int system_refcount(struct event_subsystem *system) |
46 | { | |
79ac6ef5 | 47 | return system->ref_count; |
6e94a780 SR |
48 | } |
49 | ||
50 | static int system_refcount_inc(struct event_subsystem *system) | |
51 | { | |
79ac6ef5 | 52 | return system->ref_count++; |
6e94a780 SR |
53 | } |
54 | ||
55 | static int system_refcount_dec(struct event_subsystem *system) | |
56 | { | |
79ac6ef5 | 57 | return --system->ref_count; |
6e94a780 SR |
58 | } |
59 | ||
ae63b31e SR |
60 | /* Double loops, do not use break, only goto's work */ |
61 | #define do_for_each_event_file(tr, file) \ | |
62 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
63 | list_for_each_entry(file, &tr->events, list) | |
64 | ||
65 | #define do_for_each_event_file_safe(tr, file) \ | |
66 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
7f1d2f82 | 67 | struct trace_event_file *___n; \ |
ae63b31e SR |
68 | list_for_each_entry_safe(file, ___n, &tr->events, list) |
69 | ||
70 | #define while_for_each_event_file() \ | |
71 | } | |
72 | ||
b3a8c6fd | 73 | static struct list_head * |
2425bcb9 | 74 | trace_get_fields(struct trace_event_call *event_call) |
2e33af02 SR |
75 | { |
76 | if (!event_call->class->get_fields) | |
77 | return &event_call->class->fields; | |
78 | return event_call->class->get_fields(event_call); | |
79 | } | |
80 | ||
b3a8c6fd J |
81 | static struct ftrace_event_field * |
82 | __find_event_field(struct list_head *head, char *name) | |
83 | { | |
84 | struct ftrace_event_field *field; | |
85 | ||
86 | list_for_each_entry(field, head, link) { | |
87 | if (!strcmp(field->name, name)) | |
88 | return field; | |
89 | } | |
90 | ||
91 | return NULL; | |
92 | } | |
93 | ||
94 | struct ftrace_event_field * | |
2425bcb9 | 95 | trace_find_event_field(struct trace_event_call *call, char *name) |
b3a8c6fd J |
96 | { |
97 | struct ftrace_event_field *field; | |
98 | struct list_head *head; | |
99 | ||
e57cbaf0 SRRH |
100 | head = trace_get_fields(call); |
101 | field = __find_event_field(head, name); | |
9f616680 DW |
102 | if (field) |
103 | return field; | |
104 | ||
e57cbaf0 | 105 | field = __find_event_field(&ftrace_generic_fields, name); |
b3a8c6fd J |
106 | if (field) |
107 | return field; | |
108 | ||
e57cbaf0 | 109 | return __find_event_field(&ftrace_common_fields, name); |
b3a8c6fd J |
110 | } |
111 | ||
8728fe50 LZ |
112 | static int __trace_define_field(struct list_head *head, const char *type, |
113 | const char *name, int offset, int size, | |
114 | int is_signed, int filter_type) | |
cf027f64 TZ |
115 | { |
116 | struct ftrace_event_field *field; | |
117 | ||
d1a29143 | 118 | field = kmem_cache_alloc(field_cachep, GFP_TRACE); |
cf027f64 | 119 | if (!field) |
aaf6ac0f | 120 | return -ENOMEM; |
fe9f57f2 | 121 | |
92edca07 SR |
122 | field->name = name; |
123 | field->type = type; | |
fe9f57f2 | 124 | |
43b51ead LZ |
125 | if (filter_type == FILTER_OTHER) |
126 | field->filter_type = filter_assign_type(type); | |
127 | else | |
128 | field->filter_type = filter_type; | |
129 | ||
cf027f64 TZ |
130 | field->offset = offset; |
131 | field->size = size; | |
a118e4d1 | 132 | field->is_signed = is_signed; |
aa38e9fc | 133 | |
2e33af02 | 134 | list_add(&field->link, head); |
cf027f64 TZ |
135 | |
136 | return 0; | |
cf027f64 | 137 | } |
8728fe50 | 138 | |
2425bcb9 | 139 | int trace_define_field(struct trace_event_call *call, const char *type, |
8728fe50 LZ |
140 | const char *name, int offset, int size, int is_signed, |
141 | int filter_type) | |
142 | { | |
143 | struct list_head *head; | |
144 | ||
145 | if (WARN_ON(!call->class)) | |
146 | return 0; | |
147 | ||
148 | head = trace_get_fields(call); | |
149 | return __trace_define_field(head, type, name, offset, size, | |
150 | is_signed, filter_type); | |
151 | } | |
17c873ec | 152 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 153 | |
9f616680 DW |
154 | #define __generic_field(type, item, filter_type) \ |
155 | ret = __trace_define_field(&ftrace_generic_fields, #type, \ | |
156 | #item, 0, 0, is_signed_type(type), \ | |
157 | filter_type); \ | |
158 | if (ret) \ | |
159 | return ret; | |
160 | ||
e647d6b3 | 161 | #define __common_field(type, item) \ |
8728fe50 LZ |
162 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
163 | "common_" #item, \ | |
164 | offsetof(typeof(ent), item), \ | |
165 | sizeof(ent.item), \ | |
166 | is_signed_type(type), FILTER_OTHER); \ | |
e647d6b3 LZ |
167 | if (ret) \ |
168 | return ret; | |
169 | ||
9f616680 DW |
170 | static int trace_define_generic_fields(void) |
171 | { | |
172 | int ret; | |
173 | ||
e57cbaf0 SRRH |
174 | __generic_field(int, CPU, FILTER_CPU); |
175 | __generic_field(int, cpu, FILTER_CPU); | |
176 | __generic_field(char *, COMM, FILTER_COMM); | |
177 | __generic_field(char *, comm, FILTER_COMM); | |
9f616680 DW |
178 | |
179 | return ret; | |
180 | } | |
181 | ||
8728fe50 | 182 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
183 | { |
184 | int ret; | |
185 | struct trace_entry ent; | |
186 | ||
187 | __common_field(unsigned short, type); | |
188 | __common_field(unsigned char, flags); | |
189 | __common_field(unsigned char, preempt_count); | |
190 | __common_field(int, pid); | |
e647d6b3 LZ |
191 | |
192 | return ret; | |
193 | } | |
194 | ||
2425bcb9 | 195 | static void trace_destroy_fields(struct trace_event_call *call) |
2df75e41 LZ |
196 | { |
197 | struct ftrace_event_field *field, *next; | |
2e33af02 | 198 | struct list_head *head; |
2df75e41 | 199 | |
2e33af02 SR |
200 | head = trace_get_fields(call); |
201 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 | 202 | list_del(&field->link); |
d1a29143 | 203 | kmem_cache_free(field_cachep, field); |
2df75e41 LZ |
204 | } |
205 | } | |
206 | ||
2425bcb9 | 207 | int trace_event_raw_init(struct trace_event_call *call) |
87d9b4e1 LZ |
208 | { |
209 | int id; | |
210 | ||
9023c930 | 211 | id = register_trace_event(&call->event); |
87d9b4e1 LZ |
212 | if (!id) |
213 | return -ENODEV; | |
87d9b4e1 LZ |
214 | |
215 | return 0; | |
216 | } | |
217 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
218 | ||
3fdaf80f SRRH |
219 | bool trace_event_ignore_this_pid(struct trace_event_file *trace_file) |
220 | { | |
221 | struct trace_array *tr = trace_file->tr; | |
222 | struct trace_array_cpu *data; | |
223 | struct trace_pid_list *pid_list; | |
224 | ||
225 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
226 | if (!pid_list) | |
227 | return false; | |
228 | ||
229 | data = this_cpu_ptr(tr->trace_buffer.data); | |
230 | ||
231 | return data->ignore_pid; | |
232 | } | |
233 | EXPORT_SYMBOL_GPL(trace_event_ignore_this_pid); | |
234 | ||
3f795dcf SRRH |
235 | void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer, |
236 | struct trace_event_file *trace_file, | |
237 | unsigned long len) | |
3fd40d1e | 238 | { |
2425bcb9 | 239 | struct trace_event_call *event_call = trace_file->event_call; |
3fd40d1e | 240 | |
3fdaf80f SRRH |
241 | if ((trace_file->flags & EVENT_FILE_FL_PID_FILTER) && |
242 | trace_event_ignore_this_pid(trace_file)) | |
243 | return NULL; | |
244 | ||
3fd40d1e SR |
245 | local_save_flags(fbuffer->flags); |
246 | fbuffer->pc = preempt_count(); | |
7f1d2f82 | 247 | fbuffer->trace_file = trace_file; |
3fd40d1e SR |
248 | |
249 | fbuffer->event = | |
7f1d2f82 | 250 | trace_event_buffer_lock_reserve(&fbuffer->buffer, trace_file, |
3fd40d1e SR |
251 | event_call->event.type, len, |
252 | fbuffer->flags, fbuffer->pc); | |
253 | if (!fbuffer->event) | |
254 | return NULL; | |
255 | ||
256 | fbuffer->entry = ring_buffer_event_data(fbuffer->event); | |
257 | return fbuffer->entry; | |
258 | } | |
3f795dcf | 259 | EXPORT_SYMBOL_GPL(trace_event_buffer_reserve); |
3fd40d1e | 260 | |
0daa2302 SRRH |
261 | static DEFINE_SPINLOCK(tracepoint_iter_lock); |
262 | ||
3f795dcf | 263 | static void output_printk(struct trace_event_buffer *fbuffer) |
0daa2302 | 264 | { |
2425bcb9 | 265 | struct trace_event_call *event_call; |
0daa2302 SRRH |
266 | struct trace_event *event; |
267 | unsigned long flags; | |
268 | struct trace_iterator *iter = tracepoint_print_iter; | |
269 | ||
270 | if (!iter) | |
271 | return; | |
272 | ||
7f1d2f82 | 273 | event_call = fbuffer->trace_file->event_call; |
0daa2302 SRRH |
274 | if (!event_call || !event_call->event.funcs || |
275 | !event_call->event.funcs->trace) | |
276 | return; | |
277 | ||
7f1d2f82 | 278 | event = &fbuffer->trace_file->event_call->event; |
0daa2302 SRRH |
279 | |
280 | spin_lock_irqsave(&tracepoint_iter_lock, flags); | |
281 | trace_seq_init(&iter->seq); | |
282 | iter->ent = fbuffer->entry; | |
283 | event_call->event.funcs->trace(iter, 0, event); | |
284 | trace_seq_putc(&iter->seq, 0); | |
285 | printk("%s", iter->seq.buffer); | |
286 | ||
287 | spin_unlock_irqrestore(&tracepoint_iter_lock, flags); | |
288 | } | |
289 | ||
3f795dcf | 290 | void trace_event_buffer_commit(struct trace_event_buffer *fbuffer) |
3fd40d1e | 291 | { |
0daa2302 SRRH |
292 | if (tracepoint_printk) |
293 | output_printk(fbuffer); | |
294 | ||
7f1d2f82 | 295 | event_trigger_unlock_commit(fbuffer->trace_file, fbuffer->buffer, |
3fd40d1e SR |
296 | fbuffer->event, fbuffer->entry, |
297 | fbuffer->flags, fbuffer->pc); | |
298 | } | |
3f795dcf | 299 | EXPORT_SYMBOL_GPL(trace_event_buffer_commit); |
3fd40d1e | 300 | |
2425bcb9 | 301 | int trace_event_reg(struct trace_event_call *call, |
9023c930 | 302 | enum trace_reg type, void *data) |
a1d0ce82 | 303 | { |
7f1d2f82 | 304 | struct trace_event_file *file = data; |
ae63b31e | 305 | |
de7b2973 | 306 | WARN_ON(!(call->flags & TRACE_EVENT_FL_TRACEPOINT)); |
a1d0ce82 SR |
307 | switch (type) { |
308 | case TRACE_REG_REGISTER: | |
de7b2973 | 309 | return tracepoint_probe_register(call->tp, |
a1d0ce82 | 310 | call->class->probe, |
ae63b31e | 311 | file); |
a1d0ce82 | 312 | case TRACE_REG_UNREGISTER: |
de7b2973 | 313 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 | 314 | call->class->probe, |
ae63b31e | 315 | file); |
a1d0ce82 SR |
316 | return 0; |
317 | ||
318 | #ifdef CONFIG_PERF_EVENTS | |
319 | case TRACE_REG_PERF_REGISTER: | |
de7b2973 | 320 | return tracepoint_probe_register(call->tp, |
a1d0ce82 SR |
321 | call->class->perf_probe, |
322 | call); | |
323 | case TRACE_REG_PERF_UNREGISTER: | |
de7b2973 | 324 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 SR |
325 | call->class->perf_probe, |
326 | call); | |
327 | return 0; | |
ceec0b6f JO |
328 | case TRACE_REG_PERF_OPEN: |
329 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
330 | case TRACE_REG_PERF_ADD: |
331 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 332 | return 0; |
a1d0ce82 SR |
333 | #endif |
334 | } | |
335 | return 0; | |
336 | } | |
9023c930 | 337 | EXPORT_SYMBOL_GPL(trace_event_reg); |
a1d0ce82 | 338 | |
e870e9a1 LZ |
339 | void trace_event_enable_cmd_record(bool enable) |
340 | { | |
7f1d2f82 | 341 | struct trace_event_file *file; |
ae63b31e | 342 | struct trace_array *tr; |
e870e9a1 LZ |
343 | |
344 | mutex_lock(&event_mutex); | |
ae63b31e SR |
345 | do_for_each_event_file(tr, file) { |
346 | ||
5d6ad960 | 347 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) |
e870e9a1 LZ |
348 | continue; |
349 | ||
350 | if (enable) { | |
351 | tracing_start_cmdline_record(); | |
5d6ad960 | 352 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 LZ |
353 | } else { |
354 | tracing_stop_cmdline_record(); | |
5d6ad960 | 355 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 356 | } |
ae63b31e | 357 | } while_for_each_event_file(); |
e870e9a1 LZ |
358 | mutex_unlock(&event_mutex); |
359 | } | |
360 | ||
7f1d2f82 | 361 | static int __ftrace_event_enable_disable(struct trace_event_file *file, |
417944c4 | 362 | int enable, int soft_disable) |
fd994989 | 363 | { |
2425bcb9 | 364 | struct trace_event_call *call = file->event_call; |
983f938a | 365 | struct trace_array *tr = file->tr; |
0fc1b09f | 366 | unsigned long file_flags = file->flags; |
3b8e4273 | 367 | int ret = 0; |
417944c4 | 368 | int disable; |
3b8e4273 | 369 | |
fd994989 SR |
370 | switch (enable) { |
371 | case 0: | |
417944c4 | 372 | /* |
1cf4c073 MH |
373 | * When soft_disable is set and enable is cleared, the sm_ref |
374 | * reference counter is decremented. If it reaches 0, we want | |
417944c4 SRRH |
375 | * to clear the SOFT_DISABLED flag but leave the event in the |
376 | * state that it was. That is, if the event was enabled and | |
377 | * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED | |
378 | * is set we do not want the event to be enabled before we | |
379 | * clear the bit. | |
380 | * | |
381 | * When soft_disable is not set but the SOFT_MODE flag is, | |
382 | * we do nothing. Do not disable the tracepoint, otherwise | |
383 | * "soft enable"s (clearing the SOFT_DISABLED bit) wont work. | |
384 | */ | |
385 | if (soft_disable) { | |
1cf4c073 MH |
386 | if (atomic_dec_return(&file->sm_ref) > 0) |
387 | break; | |
5d6ad960 SRRH |
388 | disable = file->flags & EVENT_FILE_FL_SOFT_DISABLED; |
389 | clear_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); | |
417944c4 | 390 | } else |
5d6ad960 | 391 | disable = !(file->flags & EVENT_FILE_FL_SOFT_MODE); |
417944c4 | 392 | |
5d6ad960 SRRH |
393 | if (disable && (file->flags & EVENT_FILE_FL_ENABLED)) { |
394 | clear_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); | |
395 | if (file->flags & EVENT_FILE_FL_RECORDED_CMD) { | |
e870e9a1 | 396 | tracing_stop_cmdline_record(); |
5d6ad960 | 397 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 398 | } |
ae63b31e | 399 | call->class->reg(call, TRACE_REG_UNREGISTER, file); |
fd994989 | 400 | } |
3baa5e4c | 401 | /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT, else clear it */ |
5d6ad960 SRRH |
402 | if (file->flags & EVENT_FILE_FL_SOFT_MODE) |
403 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); | |
3baa5e4c | 404 | else |
5d6ad960 | 405 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
fd994989 SR |
406 | break; |
407 | case 1: | |
417944c4 SRRH |
408 | /* |
409 | * When soft_disable is set and enable is set, we want to | |
410 | * register the tracepoint for the event, but leave the event | |
411 | * as is. That means, if the event was already enabled, we do | |
412 | * nothing (but set SOFT_MODE). If the event is disabled, we | |
413 | * set SOFT_DISABLED before enabling the event tracepoint, so | |
414 | * it still seems to be disabled. | |
415 | */ | |
416 | if (!soft_disable) | |
5d6ad960 | 417 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
1cf4c073 MH |
418 | else { |
419 | if (atomic_inc_return(&file->sm_ref) > 1) | |
420 | break; | |
5d6ad960 | 421 | set_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); |
1cf4c073 | 422 | } |
417944c4 | 423 | |
5d6ad960 | 424 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) { |
417944c4 SRRH |
425 | |
426 | /* Keep the event disabled, when going to SOFT_MODE. */ | |
427 | if (soft_disable) | |
5d6ad960 | 428 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
417944c4 | 429 | |
983f938a | 430 | if (tr->trace_flags & TRACE_ITER_RECORD_CMD) { |
e870e9a1 | 431 | tracing_start_cmdline_record(); |
5d6ad960 | 432 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 433 | } |
ae63b31e | 434 | ret = call->class->reg(call, TRACE_REG_REGISTER, file); |
3b8e4273 LZ |
435 | if (ret) { |
436 | tracing_stop_cmdline_record(); | |
437 | pr_info("event trace: Could not enable event " | |
687fcc4a | 438 | "%s\n", trace_event_name(call)); |
3b8e4273 LZ |
439 | break; |
440 | } | |
5d6ad960 | 441 | set_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); |
575380da SRRH |
442 | |
443 | /* WAS_ENABLED gets set but never cleared. */ | |
444 | call->flags |= TRACE_EVENT_FL_WAS_ENABLED; | |
fd994989 | 445 | } |
fd994989 SR |
446 | break; |
447 | } | |
3b8e4273 | 448 | |
0fc1b09f SRRH |
449 | /* Enable or disable use of trace_buffered_event */ |
450 | if ((file_flags & EVENT_FILE_FL_SOFT_DISABLED) != | |
451 | (file->flags & EVENT_FILE_FL_SOFT_DISABLED)) { | |
452 | if (file->flags & EVENT_FILE_FL_SOFT_DISABLED) | |
453 | trace_buffered_event_enable(); | |
454 | else | |
455 | trace_buffered_event_disable(); | |
456 | } | |
457 | ||
3b8e4273 | 458 | return ret; |
fd994989 SR |
459 | } |
460 | ||
7f1d2f82 | 461 | int trace_event_enable_disable(struct trace_event_file *file, |
85f2b082 TZ |
462 | int enable, int soft_disable) |
463 | { | |
464 | return __ftrace_event_enable_disable(file, enable, soft_disable); | |
465 | } | |
466 | ||
7f1d2f82 | 467 | static int ftrace_event_enable_disable(struct trace_event_file *file, |
417944c4 SRRH |
468 | int enable) |
469 | { | |
470 | return __ftrace_event_enable_disable(file, enable, 0); | |
471 | } | |
472 | ||
ae63b31e | 473 | static void ftrace_clear_events(struct trace_array *tr) |
0e907c99 | 474 | { |
7f1d2f82 | 475 | struct trace_event_file *file; |
0e907c99 Z |
476 | |
477 | mutex_lock(&event_mutex); | |
ae63b31e SR |
478 | list_for_each_entry(file, &tr->events, list) { |
479 | ftrace_event_enable_disable(file, 0); | |
0e907c99 Z |
480 | } |
481 | mutex_unlock(&event_mutex); | |
482 | } | |
483 | ||
f4d34a87 SR |
484 | /* Shouldn't this be in a header? */ |
485 | extern int pid_max; | |
49090107 | 486 | |
c37775d5 | 487 | /* Returns true if found in filter */ |
3fdaf80f | 488 | static bool |
c37775d5 | 489 | find_filtered_pid(struct trace_pid_list *filtered_pids, pid_t search_pid) |
3fdaf80f | 490 | { |
c37775d5 SR |
491 | /* |
492 | * If pid_max changed after filtered_pids was created, we | |
493 | * by default ignore all pids greater than the previous pid_max. | |
494 | */ | |
495 | if (search_pid >= filtered_pids->pid_max) | |
496 | return false; | |
3fdaf80f | 497 | |
c37775d5 SR |
498 | return test_bit(search_pid, filtered_pids->pids); |
499 | } | |
500 | ||
501 | static bool | |
502 | ignore_this_task(struct trace_pid_list *filtered_pids, struct task_struct *task) | |
503 | { | |
3fdaf80f SRRH |
504 | /* |
505 | * Return false, because if filtered_pids does not exist, | |
506 | * all pids are good to trace. | |
507 | */ | |
508 | if (!filtered_pids) | |
509 | return false; | |
510 | ||
c37775d5 SR |
511 | return !find_filtered_pid(filtered_pids, task->pid); |
512 | } | |
3fdaf80f | 513 | |
c37775d5 SR |
514 | static void filter_add_remove_task(struct trace_pid_list *pid_list, |
515 | struct task_struct *self, | |
516 | struct task_struct *task) | |
517 | { | |
518 | if (!pid_list) | |
519 | return; | |
520 | ||
521 | /* For forks, we only add if the forking task is listed */ | |
522 | if (self) { | |
523 | if (!find_filtered_pid(pid_list, self->pid)) | |
524 | return; | |
525 | } | |
3fdaf80f | 526 | |
c37775d5 SR |
527 | /* Sorry, but we don't support pid_max changing after setting */ |
528 | if (task->pid >= pid_list->pid_max) | |
529 | return; | |
530 | ||
531 | /* "self" is set for forks, and NULL for exits */ | |
532 | if (self) | |
533 | set_bit(task->pid, pid_list->pids); | |
534 | else | |
535 | clear_bit(task->pid, pid_list->pids); | |
536 | } | |
537 | ||
538 | static void | |
539 | event_filter_pid_sched_process_exit(void *data, struct task_struct *task) | |
540 | { | |
541 | struct trace_pid_list *pid_list; | |
542 | struct trace_array *tr = data; | |
543 | ||
544 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
545 | filter_add_remove_task(pid_list, NULL, task); | |
546 | } | |
547 | ||
548 | static void | |
549 | event_filter_pid_sched_process_fork(void *data, | |
550 | struct task_struct *self, | |
551 | struct task_struct *task) | |
552 | { | |
553 | struct trace_pid_list *pid_list; | |
554 | struct trace_array *tr = data; | |
555 | ||
556 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
557 | filter_add_remove_task(pid_list, self, task); | |
558 | } | |
559 | ||
560 | void trace_event_follow_fork(struct trace_array *tr, bool enable) | |
561 | { | |
562 | if (enable) { | |
563 | register_trace_prio_sched_process_fork(event_filter_pid_sched_process_fork, | |
564 | tr, INT_MIN); | |
565 | register_trace_prio_sched_process_exit(event_filter_pid_sched_process_exit, | |
566 | tr, INT_MAX); | |
567 | } else { | |
568 | unregister_trace_sched_process_fork(event_filter_pid_sched_process_fork, | |
569 | tr); | |
570 | unregister_trace_sched_process_exit(event_filter_pid_sched_process_exit, | |
571 | tr); | |
572 | } | |
3fdaf80f SRRH |
573 | } |
574 | ||
575 | static void | |
22402cd0 | 576 | event_filter_pid_sched_switch_probe_pre(void *data, bool preempt, |
3fdaf80f SRRH |
577 | struct task_struct *prev, struct task_struct *next) |
578 | { | |
579 | struct trace_array *tr = data; | |
580 | struct trace_pid_list *pid_list; | |
581 | ||
582 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
583 | ||
584 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
9ebc57cf SR |
585 | ignore_this_task(pid_list, prev) && |
586 | ignore_this_task(pid_list, next)); | |
3fdaf80f SRRH |
587 | } |
588 | ||
589 | static void | |
22402cd0 | 590 | event_filter_pid_sched_switch_probe_post(void *data, bool preempt, |
3fdaf80f SRRH |
591 | struct task_struct *prev, struct task_struct *next) |
592 | { | |
593 | struct trace_array *tr = data; | |
594 | struct trace_pid_list *pid_list; | |
595 | ||
596 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
597 | ||
598 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
9ebc57cf | 599 | ignore_this_task(pid_list, next)); |
3fdaf80f SRRH |
600 | } |
601 | ||
602 | static void | |
603 | event_filter_pid_sched_wakeup_probe_pre(void *data, struct task_struct *task) | |
604 | { | |
605 | struct trace_array *tr = data; | |
606 | struct trace_pid_list *pid_list; | |
607 | ||
608 | /* Nothing to do if we are already tracing */ | |
609 | if (!this_cpu_read(tr->trace_buffer.data->ignore_pid)) | |
610 | return; | |
611 | ||
612 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
613 | ||
614 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
9ebc57cf | 615 | ignore_this_task(pid_list, task)); |
3fdaf80f SRRH |
616 | } |
617 | ||
618 | static void | |
619 | event_filter_pid_sched_wakeup_probe_post(void *data, struct task_struct *task) | |
620 | { | |
621 | struct trace_array *tr = data; | |
622 | struct trace_pid_list *pid_list; | |
623 | ||
624 | /* Nothing to do if we are not tracing */ | |
625 | if (this_cpu_read(tr->trace_buffer.data->ignore_pid)) | |
626 | return; | |
627 | ||
628 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
629 | ||
630 | /* Set tracing if current is enabled */ | |
631 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
9ebc57cf | 632 | ignore_this_task(pid_list, current)); |
3fdaf80f SRRH |
633 | } |
634 | ||
49090107 SRRH |
635 | static void __ftrace_clear_event_pids(struct trace_array *tr) |
636 | { | |
637 | struct trace_pid_list *pid_list; | |
3fdaf80f SRRH |
638 | struct trace_event_file *file; |
639 | int cpu; | |
49090107 SRRH |
640 | |
641 | pid_list = rcu_dereference_protected(tr->filtered_pids, | |
642 | lockdep_is_held(&event_mutex)); | |
643 | if (!pid_list) | |
644 | return; | |
645 | ||
3fdaf80f SRRH |
646 | unregister_trace_sched_switch(event_filter_pid_sched_switch_probe_pre, tr); |
647 | unregister_trace_sched_switch(event_filter_pid_sched_switch_probe_post, tr); | |
648 | ||
649 | unregister_trace_sched_wakeup(event_filter_pid_sched_wakeup_probe_pre, tr); | |
650 | unregister_trace_sched_wakeup(event_filter_pid_sched_wakeup_probe_post, tr); | |
651 | ||
0f72e37e SRRH |
652 | unregister_trace_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_pre, tr); |
653 | unregister_trace_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_post, tr); | |
654 | ||
655 | unregister_trace_sched_waking(event_filter_pid_sched_wakeup_probe_pre, tr); | |
656 | unregister_trace_sched_waking(event_filter_pid_sched_wakeup_probe_post, tr); | |
657 | ||
3fdaf80f SRRH |
658 | list_for_each_entry(file, &tr->events, list) { |
659 | clear_bit(EVENT_FILE_FL_PID_FILTER_BIT, &file->flags); | |
660 | } | |
661 | ||
662 | for_each_possible_cpu(cpu) | |
663 | per_cpu_ptr(tr->trace_buffer.data, cpu)->ignore_pid = false; | |
664 | ||
49090107 SRRH |
665 | rcu_assign_pointer(tr->filtered_pids, NULL); |
666 | ||
667 | /* Wait till all users are no longer using pid filtering */ | |
668 | synchronize_sched(); | |
669 | ||
f4d34a87 | 670 | vfree(pid_list->pids); |
49090107 SRRH |
671 | kfree(pid_list); |
672 | } | |
673 | ||
674 | static void ftrace_clear_event_pids(struct trace_array *tr) | |
675 | { | |
676 | mutex_lock(&event_mutex); | |
677 | __ftrace_clear_event_pids(tr); | |
678 | mutex_unlock(&event_mutex); | |
679 | } | |
680 | ||
e9dbfae5 SR |
681 | static void __put_system(struct event_subsystem *system) |
682 | { | |
683 | struct event_filter *filter = system->filter; | |
684 | ||
6e94a780 SR |
685 | WARN_ON_ONCE(system_refcount(system) == 0); |
686 | if (system_refcount_dec(system)) | |
e9dbfae5 SR |
687 | return; |
688 | ||
ae63b31e SR |
689 | list_del(&system->list); |
690 | ||
e9dbfae5 SR |
691 | if (filter) { |
692 | kfree(filter->filter_string); | |
693 | kfree(filter); | |
694 | } | |
79ac6ef5 | 695 | kfree_const(system->name); |
e9dbfae5 SR |
696 | kfree(system); |
697 | } | |
698 | ||
699 | static void __get_system(struct event_subsystem *system) | |
700 | { | |
6e94a780 SR |
701 | WARN_ON_ONCE(system_refcount(system) == 0); |
702 | system_refcount_inc(system); | |
e9dbfae5 SR |
703 | } |
704 | ||
7967b3e0 | 705 | static void __get_system_dir(struct trace_subsystem_dir *dir) |
ae63b31e SR |
706 | { |
707 | WARN_ON_ONCE(dir->ref_count == 0); | |
708 | dir->ref_count++; | |
709 | __get_system(dir->subsystem); | |
710 | } | |
711 | ||
7967b3e0 | 712 | static void __put_system_dir(struct trace_subsystem_dir *dir) |
ae63b31e SR |
713 | { |
714 | WARN_ON_ONCE(dir->ref_count == 0); | |
715 | /* If the subsystem is about to be freed, the dir must be too */ | |
6e94a780 | 716 | WARN_ON_ONCE(system_refcount(dir->subsystem) == 1 && dir->ref_count != 1); |
ae63b31e SR |
717 | |
718 | __put_system(dir->subsystem); | |
719 | if (!--dir->ref_count) | |
720 | kfree(dir); | |
721 | } | |
722 | ||
7967b3e0 | 723 | static void put_system(struct trace_subsystem_dir *dir) |
e9dbfae5 SR |
724 | { |
725 | mutex_lock(&event_mutex); | |
ae63b31e | 726 | __put_system_dir(dir); |
e9dbfae5 SR |
727 | mutex_unlock(&event_mutex); |
728 | } | |
729 | ||
7967b3e0 | 730 | static void remove_subsystem(struct trace_subsystem_dir *dir) |
f6a84bdc ON |
731 | { |
732 | if (!dir) | |
733 | return; | |
734 | ||
735 | if (!--dir->nr_events) { | |
8434dc93 | 736 | tracefs_remove_recursive(dir->entry); |
f6a84bdc ON |
737 | list_del(&dir->list); |
738 | __put_system_dir(dir); | |
739 | } | |
740 | } | |
741 | ||
7f1d2f82 | 742 | static void remove_event_file_dir(struct trace_event_file *file) |
f6a84bdc | 743 | { |
bf682c31 ON |
744 | struct dentry *dir = file->dir; |
745 | struct dentry *child; | |
746 | ||
747 | if (dir) { | |
748 | spin_lock(&dir->d_lock); /* probably unneeded */ | |
946e51f2 | 749 | list_for_each_entry(child, &dir->d_subdirs, d_child) { |
7682c918 DH |
750 | if (d_really_is_positive(child)) /* probably unneeded */ |
751 | d_inode(child)->i_private = NULL; | |
bf682c31 ON |
752 | } |
753 | spin_unlock(&dir->d_lock); | |
754 | ||
8434dc93 | 755 | tracefs_remove_recursive(dir); |
bf682c31 ON |
756 | } |
757 | ||
f6a84bdc | 758 | list_del(&file->list); |
f6a84bdc | 759 | remove_subsystem(file->system); |
2448e349 | 760 | free_event_filter(file->filter); |
f6a84bdc ON |
761 | kmem_cache_free(file_cachep, file); |
762 | } | |
763 | ||
8f31bfe5 LZ |
764 | /* |
765 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
766 | */ | |
2a6c24af SRRH |
767 | static int |
768 | __ftrace_set_clr_event_nolock(struct trace_array *tr, const char *match, | |
769 | const char *sub, const char *event, int set) | |
b77e38aa | 770 | { |
7f1d2f82 | 771 | struct trace_event_file *file; |
2425bcb9 | 772 | struct trace_event_call *call; |
de7b2973 | 773 | const char *name; |
29f93943 | 774 | int ret = -EINVAL; |
8f31bfe5 | 775 | |
ae63b31e SR |
776 | list_for_each_entry(file, &tr->events, list) { |
777 | ||
778 | call = file->event_call; | |
687fcc4a | 779 | name = trace_event_name(call); |
8f31bfe5 | 780 | |
de7b2973 | 781 | if (!name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
782 | continue; |
783 | ||
9b63776f SR |
784 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
785 | continue; | |
786 | ||
8f31bfe5 | 787 | if (match && |
de7b2973 | 788 | strcmp(match, name) != 0 && |
8f082018 | 789 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
790 | continue; |
791 | ||
8f082018 | 792 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
793 | continue; |
794 | ||
de7b2973 | 795 | if (event && strcmp(event, name) != 0) |
8f31bfe5 LZ |
796 | continue; |
797 | ||
ae63b31e | 798 | ftrace_event_enable_disable(file, set); |
8f31bfe5 LZ |
799 | |
800 | ret = 0; | |
801 | } | |
2a6c24af SRRH |
802 | |
803 | return ret; | |
804 | } | |
805 | ||
806 | static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, | |
807 | const char *sub, const char *event, int set) | |
808 | { | |
809 | int ret; | |
810 | ||
811 | mutex_lock(&event_mutex); | |
812 | ret = __ftrace_set_clr_event_nolock(tr, match, sub, event, set); | |
8f31bfe5 LZ |
813 | mutex_unlock(&event_mutex); |
814 | ||
815 | return ret; | |
816 | } | |
817 | ||
ae63b31e | 818 | static int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set) |
8f31bfe5 | 819 | { |
b628b3e6 | 820 | char *event = NULL, *sub = NULL, *match; |
84fce9db | 821 | int ret; |
b628b3e6 SR |
822 | |
823 | /* | |
824 | * The buf format can be <subsystem>:<event-name> | |
825 | * *:<event-name> means any event by that name. | |
826 | * :<event-name> is the same. | |
827 | * | |
828 | * <subsystem>:* means all events in that subsystem | |
829 | * <subsystem>: means the same. | |
830 | * | |
831 | * <name> (no ':') means all events in a subsystem with | |
832 | * the name <name> or any event that matches <name> | |
833 | */ | |
834 | ||
835 | match = strsep(&buf, ":"); | |
836 | if (buf) { | |
837 | sub = match; | |
838 | event = buf; | |
839 | match = NULL; | |
840 | ||
841 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
842 | sub = NULL; | |
843 | if (!strlen(event) || strcmp(event, "*") == 0) | |
844 | event = NULL; | |
845 | } | |
b77e38aa | 846 | |
84fce9db JK |
847 | ret = __ftrace_set_clr_event(tr, match, sub, event, set); |
848 | ||
849 | /* Put back the colon to allow this to be called again */ | |
850 | if (buf) | |
851 | *(buf - 1) = ':'; | |
852 | ||
853 | return ret; | |
b77e38aa SR |
854 | } |
855 | ||
4671c794 SR |
856 | /** |
857 | * trace_set_clr_event - enable or disable an event | |
858 | * @system: system name to match (NULL for any system) | |
859 | * @event: event name to match (NULL for all events, within system) | |
860 | * @set: 1 to enable, 0 to disable | |
861 | * | |
862 | * This is a way for other parts of the kernel to enable or disable | |
863 | * event recording. | |
864 | * | |
865 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
866 | * registered events. | |
867 | */ | |
868 | int trace_set_clr_event(const char *system, const char *event, int set) | |
869 | { | |
ae63b31e SR |
870 | struct trace_array *tr = top_trace_array(); |
871 | ||
dc81e5e3 YY |
872 | if (!tr) |
873 | return -ENODEV; | |
874 | ||
ae63b31e | 875 | return __ftrace_set_clr_event(tr, NULL, system, event, set); |
4671c794 | 876 | } |
56355b83 | 877 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 878 | |
b77e38aa SR |
879 | /* 128 should be much more than enough */ |
880 | #define EVENT_BUF_SIZE 127 | |
881 | ||
882 | static ssize_t | |
883 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
884 | size_t cnt, loff_t *ppos) | |
885 | { | |
48966364 | 886 | struct trace_parser parser; |
ae63b31e SR |
887 | struct seq_file *m = file->private_data; |
888 | struct trace_array *tr = m->private; | |
4ba7978e | 889 | ssize_t read, ret; |
b77e38aa | 890 | |
4ba7978e | 891 | if (!cnt) |
b77e38aa SR |
892 | return 0; |
893 | ||
1852fcce SR |
894 | ret = tracing_update_buffers(); |
895 | if (ret < 0) | |
896 | return ret; | |
897 | ||
48966364 | 898 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
899 | return -ENOMEM; |
900 | ||
48966364 | 901 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
902 | ||
4ba7978e | 903 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 904 | int set = 1; |
b77e38aa | 905 | |
48966364 | 906 | if (*parser.buffer == '!') |
b77e38aa | 907 | set = 0; |
b77e38aa | 908 | |
48966364 | 909 | parser.buffer[parser.idx] = 0; |
910 | ||
ae63b31e | 911 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
b77e38aa | 912 | if (ret) |
48966364 | 913 | goto out_put; |
b77e38aa | 914 | } |
b77e38aa SR |
915 | |
916 | ret = read; | |
917 | ||
48966364 | 918 | out_put: |
919 | trace_parser_put(&parser); | |
b77e38aa SR |
920 | |
921 | return ret; | |
922 | } | |
923 | ||
924 | static void * | |
925 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
926 | { | |
7f1d2f82 | 927 | struct trace_event_file *file = v; |
2425bcb9 | 928 | struct trace_event_call *call; |
ae63b31e | 929 | struct trace_array *tr = m->private; |
b77e38aa SR |
930 | |
931 | (*pos)++; | |
932 | ||
ae63b31e SR |
933 | list_for_each_entry_continue(file, &tr->events, list) { |
934 | call = file->event_call; | |
40e26815 SR |
935 | /* |
936 | * The ftrace subsystem is for showing formats only. | |
937 | * They can not be enabled or disabled via the event files. | |
938 | */ | |
d045437a SRRH |
939 | if (call->class && call->class->reg && |
940 | !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) | |
ae63b31e | 941 | return file; |
40e26815 | 942 | } |
b77e38aa | 943 | |
30bd39cd | 944 | return NULL; |
b77e38aa SR |
945 | } |
946 | ||
947 | static void *t_start(struct seq_file *m, loff_t *pos) | |
948 | { | |
7f1d2f82 | 949 | struct trace_event_file *file; |
ae63b31e | 950 | struct trace_array *tr = m->private; |
e1c7e2a6 LZ |
951 | loff_t l; |
952 | ||
20c8928a | 953 | mutex_lock(&event_mutex); |
e1c7e2a6 | 954 | |
7f1d2f82 | 955 | file = list_entry(&tr->events, struct trace_event_file, list); |
e1c7e2a6 | 956 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
957 | file = t_next(m, file, &l); |
958 | if (!file) | |
e1c7e2a6 LZ |
959 | break; |
960 | } | |
ae63b31e | 961 | return file; |
b77e38aa SR |
962 | } |
963 | ||
964 | static void * | |
965 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
966 | { | |
7f1d2f82 | 967 | struct trace_event_file *file = v; |
ae63b31e | 968 | struct trace_array *tr = m->private; |
b77e38aa SR |
969 | |
970 | (*pos)++; | |
971 | ||
ae63b31e | 972 | list_for_each_entry_continue(file, &tr->events, list) { |
5d6ad960 | 973 | if (file->flags & EVENT_FILE_FL_ENABLED) |
ae63b31e | 974 | return file; |
b77e38aa SR |
975 | } |
976 | ||
30bd39cd | 977 | return NULL; |
b77e38aa SR |
978 | } |
979 | ||
980 | static void *s_start(struct seq_file *m, loff_t *pos) | |
981 | { | |
7f1d2f82 | 982 | struct trace_event_file *file; |
ae63b31e | 983 | struct trace_array *tr = m->private; |
e1c7e2a6 LZ |
984 | loff_t l; |
985 | ||
20c8928a | 986 | mutex_lock(&event_mutex); |
e1c7e2a6 | 987 | |
7f1d2f82 | 988 | file = list_entry(&tr->events, struct trace_event_file, list); |
e1c7e2a6 | 989 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
990 | file = s_next(m, file, &l); |
991 | if (!file) | |
e1c7e2a6 LZ |
992 | break; |
993 | } | |
ae63b31e | 994 | return file; |
b77e38aa SR |
995 | } |
996 | ||
997 | static int t_show(struct seq_file *m, void *v) | |
998 | { | |
7f1d2f82 | 999 | struct trace_event_file *file = v; |
2425bcb9 | 1000 | struct trace_event_call *call = file->event_call; |
b77e38aa | 1001 | |
8f082018 SR |
1002 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
1003 | seq_printf(m, "%s:", call->class->system); | |
687fcc4a | 1004 | seq_printf(m, "%s\n", trace_event_name(call)); |
b77e38aa SR |
1005 | |
1006 | return 0; | |
1007 | } | |
1008 | ||
1009 | static void t_stop(struct seq_file *m, void *p) | |
1010 | { | |
20c8928a | 1011 | mutex_unlock(&event_mutex); |
b77e38aa SR |
1012 | } |
1013 | ||
f4d34a87 SR |
1014 | static void * |
1015 | p_next(struct seq_file *m, void *v, loff_t *pos) | |
1016 | { | |
1017 | struct trace_array *tr = m->private; | |
1018 | struct trace_pid_list *pid_list = rcu_dereference_sched(tr->filtered_pids); | |
1019 | unsigned long pid = (unsigned long)v; | |
1020 | ||
1021 | (*pos)++; | |
1022 | ||
1023 | /* pid already is +1 of the actual prevous bit */ | |
1024 | pid = find_next_bit(pid_list->pids, pid_list->pid_max, pid); | |
1025 | ||
1026 | /* Return pid + 1 to allow zero to be represented */ | |
1027 | if (pid < pid_list->pid_max) | |
1028 | return (void *)(pid + 1); | |
1029 | ||
1030 | return NULL; | |
1031 | } | |
1032 | ||
49090107 | 1033 | static void *p_start(struct seq_file *m, loff_t *pos) |
fb662288 | 1034 | __acquires(RCU) |
49090107 SRRH |
1035 | { |
1036 | struct trace_pid_list *pid_list; | |
1037 | struct trace_array *tr = m->private; | |
f4d34a87 SR |
1038 | unsigned long pid; |
1039 | loff_t l = 0; | |
49090107 SRRH |
1040 | |
1041 | /* | |
1042 | * Grab the mutex, to keep calls to p_next() having the same | |
1043 | * tr->filtered_pids as p_start() has. | |
1044 | * If we just passed the tr->filtered_pids around, then RCU would | |
1045 | * have been enough, but doing that makes things more complex. | |
1046 | */ | |
1047 | mutex_lock(&event_mutex); | |
1048 | rcu_read_lock_sched(); | |
1049 | ||
1050 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
1051 | ||
f4d34a87 | 1052 | if (!pid_list) |
49090107 SRRH |
1053 | return NULL; |
1054 | ||
f4d34a87 SR |
1055 | pid = find_first_bit(pid_list->pids, pid_list->pid_max); |
1056 | if (pid >= pid_list->pid_max) | |
1057 | return NULL; | |
1058 | ||
1059 | /* Return pid + 1 so that zero can be the exit value */ | |
1060 | for (pid++; pid && l < *pos; | |
1061 | pid = (unsigned long)p_next(m, (void *)pid, &l)) | |
1062 | ; | |
1063 | return (void *)pid; | |
49090107 SRRH |
1064 | } |
1065 | ||
1066 | static void p_stop(struct seq_file *m, void *p) | |
fb662288 | 1067 | __releases(RCU) |
49090107 SRRH |
1068 | { |
1069 | rcu_read_unlock_sched(); | |
1070 | mutex_unlock(&event_mutex); | |
1071 | } | |
1072 | ||
49090107 SRRH |
1073 | static int p_show(struct seq_file *m, void *v) |
1074 | { | |
f4d34a87 | 1075 | unsigned long pid = (unsigned long)v - 1; |
49090107 | 1076 | |
f4d34a87 | 1077 | seq_printf(m, "%lu\n", pid); |
49090107 SRRH |
1078 | return 0; |
1079 | } | |
1080 | ||
1473e441 SR |
1081 | static ssize_t |
1082 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1083 | loff_t *ppos) | |
1084 | { | |
7f1d2f82 | 1085 | struct trace_event_file *file; |
bc6f6b08 | 1086 | unsigned long flags; |
a4390596 TZ |
1087 | char buf[4] = "0"; |
1088 | ||
bc6f6b08 ON |
1089 | mutex_lock(&event_mutex); |
1090 | file = event_file_data(filp); | |
1091 | if (likely(file)) | |
1092 | flags = file->flags; | |
1093 | mutex_unlock(&event_mutex); | |
1094 | ||
1095 | if (!file) | |
1096 | return -ENODEV; | |
1097 | ||
5d6ad960 SRRH |
1098 | if (flags & EVENT_FILE_FL_ENABLED && |
1099 | !(flags & EVENT_FILE_FL_SOFT_DISABLED)) | |
a4390596 TZ |
1100 | strcpy(buf, "1"); |
1101 | ||
5d6ad960 SRRH |
1102 | if (flags & EVENT_FILE_FL_SOFT_DISABLED || |
1103 | flags & EVENT_FILE_FL_SOFT_MODE) | |
a4390596 TZ |
1104 | strcat(buf, "*"); |
1105 | ||
1106 | strcat(buf, "\n"); | |
1473e441 | 1107 | |
417944c4 | 1108 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf)); |
1473e441 SR |
1109 | } |
1110 | ||
1111 | static ssize_t | |
1112 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1113 | loff_t *ppos) | |
1114 | { | |
7f1d2f82 | 1115 | struct trace_event_file *file; |
1473e441 SR |
1116 | unsigned long val; |
1117 | int ret; | |
1118 | ||
22fe9b54 PH |
1119 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
1120 | if (ret) | |
1473e441 SR |
1121 | return ret; |
1122 | ||
1852fcce SR |
1123 | ret = tracing_update_buffers(); |
1124 | if (ret < 0) | |
1125 | return ret; | |
1126 | ||
1473e441 SR |
1127 | switch (val) { |
1128 | case 0: | |
1473e441 | 1129 | case 1: |
bc6f6b08 | 1130 | ret = -ENODEV; |
11a241a3 | 1131 | mutex_lock(&event_mutex); |
bc6f6b08 ON |
1132 | file = event_file_data(filp); |
1133 | if (likely(file)) | |
1134 | ret = ftrace_event_enable_disable(file, val); | |
11a241a3 | 1135 | mutex_unlock(&event_mutex); |
1473e441 SR |
1136 | break; |
1137 | ||
1138 | default: | |
1139 | return -EINVAL; | |
1140 | } | |
1141 | ||
1142 | *ppos += cnt; | |
1143 | ||
3b8e4273 | 1144 | return ret ? ret : cnt; |
1473e441 SR |
1145 | } |
1146 | ||
8ae79a13 SR |
1147 | static ssize_t |
1148 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1149 | loff_t *ppos) | |
1150 | { | |
c142b15d | 1151 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
7967b3e0 | 1152 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1153 | struct event_subsystem *system = dir->subsystem; |
2425bcb9 | 1154 | struct trace_event_call *call; |
7f1d2f82 | 1155 | struct trace_event_file *file; |
ae63b31e | 1156 | struct trace_array *tr = dir->tr; |
8ae79a13 | 1157 | char buf[2]; |
c142b15d | 1158 | int set = 0; |
8ae79a13 SR |
1159 | int ret; |
1160 | ||
8ae79a13 | 1161 | mutex_lock(&event_mutex); |
ae63b31e SR |
1162 | list_for_each_entry(file, &tr->events, list) { |
1163 | call = file->event_call; | |
687fcc4a | 1164 | if (!trace_event_name(call) || !call->class || !call->class->reg) |
8ae79a13 SR |
1165 | continue; |
1166 | ||
40ee4dff | 1167 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
1168 | continue; |
1169 | ||
1170 | /* | |
1171 | * We need to find out if all the events are set | |
1172 | * or if all events or cleared, or if we have | |
1173 | * a mixture. | |
1174 | */ | |
5d6ad960 | 1175 | set |= (1 << !!(file->flags & EVENT_FILE_FL_ENABLED)); |
c142b15d | 1176 | |
8ae79a13 SR |
1177 | /* |
1178 | * If we have a mixture, no need to look further. | |
1179 | */ | |
c142b15d | 1180 | if (set == 3) |
8ae79a13 SR |
1181 | break; |
1182 | } | |
1183 | mutex_unlock(&event_mutex); | |
1184 | ||
c142b15d | 1185 | buf[0] = set_to_char[set]; |
8ae79a13 | 1186 | buf[1] = '\n'; |
8ae79a13 SR |
1187 | |
1188 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
1189 | ||
1190 | return ret; | |
1191 | } | |
1192 | ||
1193 | static ssize_t | |
1194 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1195 | loff_t *ppos) | |
1196 | { | |
7967b3e0 | 1197 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1198 | struct event_subsystem *system = dir->subsystem; |
40ee4dff | 1199 | const char *name = NULL; |
8ae79a13 | 1200 | unsigned long val; |
8ae79a13 SR |
1201 | ssize_t ret; |
1202 | ||
22fe9b54 PH |
1203 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
1204 | if (ret) | |
8ae79a13 SR |
1205 | return ret; |
1206 | ||
1207 | ret = tracing_update_buffers(); | |
1208 | if (ret < 0) | |
1209 | return ret; | |
1210 | ||
8f31bfe5 | 1211 | if (val != 0 && val != 1) |
8ae79a13 | 1212 | return -EINVAL; |
8ae79a13 | 1213 | |
40ee4dff SR |
1214 | /* |
1215 | * Opening of "enable" adds a ref count to system, | |
1216 | * so the name is safe to use. | |
1217 | */ | |
1218 | if (system) | |
1219 | name = system->name; | |
1220 | ||
ae63b31e | 1221 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
8ae79a13 | 1222 | if (ret) |
8f31bfe5 | 1223 | goto out; |
8ae79a13 SR |
1224 | |
1225 | ret = cnt; | |
1226 | ||
8f31bfe5 | 1227 | out: |
8ae79a13 SR |
1228 | *ppos += cnt; |
1229 | ||
1230 | return ret; | |
1231 | } | |
1232 | ||
2a37a3df SR |
1233 | enum { |
1234 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
1235 | FORMAT_FIELD_SEPERATOR = 2, |
1236 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
1237 | }; |
1238 | ||
1239 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 1240 | { |
2425bcb9 | 1241 | struct trace_event_call *call = event_file_data(m->private); |
86397dc3 LZ |
1242 | struct list_head *common_head = &ftrace_common_fields; |
1243 | struct list_head *head = trace_get_fields(call); | |
7710b639 | 1244 | struct list_head *node = v; |
981d081e | 1245 | |
2a37a3df | 1246 | (*pos)++; |
5a65e956 | 1247 | |
2a37a3df SR |
1248 | switch ((unsigned long)v) { |
1249 | case FORMAT_HEADER: | |
7710b639 ON |
1250 | node = common_head; |
1251 | break; | |
5a65e956 | 1252 | |
86397dc3 | 1253 | case FORMAT_FIELD_SEPERATOR: |
7710b639 ON |
1254 | node = head; |
1255 | break; | |
5a65e956 | 1256 | |
2a37a3df SR |
1257 | case FORMAT_PRINTFMT: |
1258 | /* all done */ | |
1259 | return NULL; | |
5a65e956 LJ |
1260 | } |
1261 | ||
7710b639 ON |
1262 | node = node->prev; |
1263 | if (node == common_head) | |
86397dc3 | 1264 | return (void *)FORMAT_FIELD_SEPERATOR; |
7710b639 | 1265 | else if (node == head) |
2a37a3df | 1266 | return (void *)FORMAT_PRINTFMT; |
7710b639 ON |
1267 | else |
1268 | return node; | |
2a37a3df SR |
1269 | } |
1270 | ||
1271 | static int f_show(struct seq_file *m, void *v) | |
1272 | { | |
2425bcb9 | 1273 | struct trace_event_call *call = event_file_data(m->private); |
2a37a3df SR |
1274 | struct ftrace_event_field *field; |
1275 | const char *array_descriptor; | |
1276 | ||
1277 | switch ((unsigned long)v) { | |
1278 | case FORMAT_HEADER: | |
687fcc4a | 1279 | seq_printf(m, "name: %s\n", trace_event_name(call)); |
2a37a3df | 1280 | seq_printf(m, "ID: %d\n", call->event.type); |
fa6f0cc7 | 1281 | seq_puts(m, "format:\n"); |
8728fe50 | 1282 | return 0; |
5a65e956 | 1283 | |
86397dc3 LZ |
1284 | case FORMAT_FIELD_SEPERATOR: |
1285 | seq_putc(m, '\n'); | |
1286 | return 0; | |
1287 | ||
2a37a3df SR |
1288 | case FORMAT_PRINTFMT: |
1289 | seq_printf(m, "\nprint fmt: %s\n", | |
1290 | call->print_fmt); | |
1291 | return 0; | |
981d081e | 1292 | } |
8728fe50 | 1293 | |
7710b639 | 1294 | field = list_entry(v, struct ftrace_event_field, link); |
2a37a3df SR |
1295 | /* |
1296 | * Smartly shows the array type(except dynamic array). | |
1297 | * Normal: | |
1298 | * field:TYPE VAR | |
1299 | * If TYPE := TYPE[LEN], it is shown: | |
1300 | * field:TYPE VAR[LEN] | |
1301 | */ | |
1302 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 1303 | |
2a37a3df SR |
1304 | if (!strncmp(field->type, "__data_loc", 10)) |
1305 | array_descriptor = NULL; | |
8728fe50 | 1306 | |
2a37a3df SR |
1307 | if (!array_descriptor) |
1308 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
1309 | field->type, field->name, field->offset, | |
1310 | field->size, !!field->is_signed); | |
1311 | else | |
1312 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
1313 | (int)(array_descriptor - field->type), | |
1314 | field->type, field->name, | |
1315 | array_descriptor, field->offset, | |
1316 | field->size, !!field->is_signed); | |
8728fe50 | 1317 | |
2a37a3df SR |
1318 | return 0; |
1319 | } | |
5a65e956 | 1320 | |
7710b639 ON |
1321 | static void *f_start(struct seq_file *m, loff_t *pos) |
1322 | { | |
1323 | void *p = (void *)FORMAT_HEADER; | |
1324 | loff_t l = 0; | |
1325 | ||
c5a44a12 ON |
1326 | /* ->stop() is called even if ->start() fails */ |
1327 | mutex_lock(&event_mutex); | |
1328 | if (!event_file_data(m->private)) | |
1329 | return ERR_PTR(-ENODEV); | |
1330 | ||
7710b639 ON |
1331 | while (l < *pos && p) |
1332 | p = f_next(m, p, &l); | |
1333 | ||
1334 | return p; | |
1335 | } | |
1336 | ||
2a37a3df SR |
1337 | static void f_stop(struct seq_file *m, void *p) |
1338 | { | |
c5a44a12 | 1339 | mutex_unlock(&event_mutex); |
2a37a3df | 1340 | } |
981d081e | 1341 | |
2a37a3df SR |
1342 | static const struct seq_operations trace_format_seq_ops = { |
1343 | .start = f_start, | |
1344 | .next = f_next, | |
1345 | .stop = f_stop, | |
1346 | .show = f_show, | |
1347 | }; | |
1348 | ||
1349 | static int trace_format_open(struct inode *inode, struct file *file) | |
1350 | { | |
2a37a3df SR |
1351 | struct seq_file *m; |
1352 | int ret; | |
1353 | ||
1354 | ret = seq_open(file, &trace_format_seq_ops); | |
1355 | if (ret < 0) | |
1356 | return ret; | |
1357 | ||
1358 | m = file->private_data; | |
c5a44a12 | 1359 | m->private = file; |
2a37a3df SR |
1360 | |
1361 | return 0; | |
981d081e SR |
1362 | } |
1363 | ||
23725aee PZ |
1364 | static ssize_t |
1365 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1366 | { | |
1a11126b | 1367 | int id = (long)event_file_data(filp); |
cd458ba9 ON |
1368 | char buf[32]; |
1369 | int len; | |
23725aee PZ |
1370 | |
1371 | if (*ppos) | |
1372 | return 0; | |
1373 | ||
1a11126b ON |
1374 | if (unlikely(!id)) |
1375 | return -ENODEV; | |
1376 | ||
1377 | len = sprintf(buf, "%d\n", id); | |
1378 | ||
cd458ba9 | 1379 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); |
23725aee PZ |
1380 | } |
1381 | ||
7ce7e424 TZ |
1382 | static ssize_t |
1383 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1384 | loff_t *ppos) | |
1385 | { | |
7f1d2f82 | 1386 | struct trace_event_file *file; |
7ce7e424 | 1387 | struct trace_seq *s; |
e2912b09 | 1388 | int r = -ENODEV; |
7ce7e424 TZ |
1389 | |
1390 | if (*ppos) | |
1391 | return 0; | |
1392 | ||
1393 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
e2912b09 | 1394 | |
7ce7e424 TZ |
1395 | if (!s) |
1396 | return -ENOMEM; | |
1397 | ||
1398 | trace_seq_init(s); | |
1399 | ||
e2912b09 | 1400 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1401 | file = event_file_data(filp); |
1402 | if (file) | |
1403 | print_event_filter(file, s); | |
e2912b09 ON |
1404 | mutex_unlock(&event_mutex); |
1405 | ||
f306cc82 | 1406 | if (file) |
5ac48378 SRRH |
1407 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1408 | s->buffer, trace_seq_used(s)); | |
7ce7e424 TZ |
1409 | |
1410 | kfree(s); | |
1411 | ||
1412 | return r; | |
1413 | } | |
1414 | ||
1415 | static ssize_t | |
1416 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1417 | loff_t *ppos) | |
1418 | { | |
7f1d2f82 | 1419 | struct trace_event_file *file; |
8b372562 | 1420 | char *buf; |
e2912b09 | 1421 | int err = -ENODEV; |
7ce7e424 | 1422 | |
8b372562 | 1423 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
1424 | return -EINVAL; |
1425 | ||
70f6cbb6 AV |
1426 | buf = memdup_user_nul(ubuf, cnt); |
1427 | if (IS_ERR(buf)) | |
1428 | return PTR_ERR(buf); | |
7ce7e424 | 1429 | |
e2912b09 | 1430 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1431 | file = event_file_data(filp); |
1432 | if (file) | |
1433 | err = apply_event_filter(file, buf); | |
e2912b09 ON |
1434 | mutex_unlock(&event_mutex); |
1435 | ||
70f6cbb6 | 1436 | kfree(buf); |
8b372562 | 1437 | if (err < 0) |
44e9c8b7 | 1438 | return err; |
0a19e53c | 1439 | |
7ce7e424 TZ |
1440 | *ppos += cnt; |
1441 | ||
1442 | return cnt; | |
1443 | } | |
1444 | ||
e9dbfae5 SR |
1445 | static LIST_HEAD(event_subsystems); |
1446 | ||
1447 | static int subsystem_open(struct inode *inode, struct file *filp) | |
1448 | { | |
1449 | struct event_subsystem *system = NULL; | |
7967b3e0 | 1450 | struct trace_subsystem_dir *dir = NULL; /* Initialize for gcc */ |
ae63b31e | 1451 | struct trace_array *tr; |
e9dbfae5 SR |
1452 | int ret; |
1453 | ||
d6d3523c GB |
1454 | if (tracing_is_disabled()) |
1455 | return -ENODEV; | |
1456 | ||
e9dbfae5 | 1457 | /* Make sure the system still exists */ |
a8227415 | 1458 | mutex_lock(&trace_types_lock); |
e9dbfae5 | 1459 | mutex_lock(&event_mutex); |
ae63b31e SR |
1460 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
1461 | list_for_each_entry(dir, &tr->systems, list) { | |
1462 | if (dir == inode->i_private) { | |
1463 | /* Don't open systems with no events */ | |
1464 | if (dir->nr_events) { | |
1465 | __get_system_dir(dir); | |
1466 | system = dir->subsystem; | |
1467 | } | |
1468 | goto exit_loop; | |
e9dbfae5 | 1469 | } |
e9dbfae5 SR |
1470 | } |
1471 | } | |
ae63b31e | 1472 | exit_loop: |
e9dbfae5 | 1473 | mutex_unlock(&event_mutex); |
a8227415 | 1474 | mutex_unlock(&trace_types_lock); |
e9dbfae5 | 1475 | |
ae63b31e | 1476 | if (!system) |
e9dbfae5 SR |
1477 | return -ENODEV; |
1478 | ||
ae63b31e SR |
1479 | /* Some versions of gcc think dir can be uninitialized here */ |
1480 | WARN_ON(!dir); | |
1481 | ||
8e2e2fa4 SRRH |
1482 | /* Still need to increment the ref count of the system */ |
1483 | if (trace_array_get(tr) < 0) { | |
1484 | put_system(dir); | |
1485 | return -ENODEV; | |
1486 | } | |
1487 | ||
e9dbfae5 | 1488 | ret = tracing_open_generic(inode, filp); |
8e2e2fa4 SRRH |
1489 | if (ret < 0) { |
1490 | trace_array_put(tr); | |
ae63b31e | 1491 | put_system(dir); |
8e2e2fa4 | 1492 | } |
ae63b31e SR |
1493 | |
1494 | return ret; | |
1495 | } | |
1496 | ||
1497 | static int system_tr_open(struct inode *inode, struct file *filp) | |
1498 | { | |
7967b3e0 | 1499 | struct trace_subsystem_dir *dir; |
ae63b31e SR |
1500 | struct trace_array *tr = inode->i_private; |
1501 | int ret; | |
1502 | ||
d6d3523c GB |
1503 | if (tracing_is_disabled()) |
1504 | return -ENODEV; | |
1505 | ||
8e2e2fa4 SRRH |
1506 | if (trace_array_get(tr) < 0) |
1507 | return -ENODEV; | |
1508 | ||
ae63b31e SR |
1509 | /* Make a temporary dir that has no system but points to tr */ |
1510 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); | |
8e2e2fa4 SRRH |
1511 | if (!dir) { |
1512 | trace_array_put(tr); | |
ae63b31e | 1513 | return -ENOMEM; |
8e2e2fa4 | 1514 | } |
ae63b31e SR |
1515 | |
1516 | dir->tr = tr; | |
1517 | ||
1518 | ret = tracing_open_generic(inode, filp); | |
8e2e2fa4 SRRH |
1519 | if (ret < 0) { |
1520 | trace_array_put(tr); | |
ae63b31e | 1521 | kfree(dir); |
d6d3523c | 1522 | return ret; |
8e2e2fa4 | 1523 | } |
ae63b31e SR |
1524 | |
1525 | filp->private_data = dir; | |
e9dbfae5 | 1526 | |
d6d3523c | 1527 | return 0; |
e9dbfae5 SR |
1528 | } |
1529 | ||
1530 | static int subsystem_release(struct inode *inode, struct file *file) | |
1531 | { | |
7967b3e0 | 1532 | struct trace_subsystem_dir *dir = file->private_data; |
e9dbfae5 | 1533 | |
8e2e2fa4 SRRH |
1534 | trace_array_put(dir->tr); |
1535 | ||
ae63b31e SR |
1536 | /* |
1537 | * If dir->subsystem is NULL, then this is a temporary | |
1538 | * descriptor that was made for a trace_array to enable | |
1539 | * all subsystems. | |
1540 | */ | |
1541 | if (dir->subsystem) | |
1542 | put_system(dir); | |
1543 | else | |
1544 | kfree(dir); | |
e9dbfae5 SR |
1545 | |
1546 | return 0; | |
1547 | } | |
1548 | ||
cfb180f3 TZ |
1549 | static ssize_t |
1550 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1551 | loff_t *ppos) | |
1552 | { | |
7967b3e0 | 1553 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1554 | struct event_subsystem *system = dir->subsystem; |
cfb180f3 TZ |
1555 | struct trace_seq *s; |
1556 | int r; | |
1557 | ||
1558 | if (*ppos) | |
1559 | return 0; | |
1560 | ||
1561 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1562 | if (!s) | |
1563 | return -ENOMEM; | |
1564 | ||
1565 | trace_seq_init(s); | |
1566 | ||
8b372562 | 1567 | print_subsystem_event_filter(system, s); |
5ac48378 SRRH |
1568 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1569 | s->buffer, trace_seq_used(s)); | |
cfb180f3 TZ |
1570 | |
1571 | kfree(s); | |
1572 | ||
1573 | return r; | |
1574 | } | |
1575 | ||
1576 | static ssize_t | |
1577 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1578 | loff_t *ppos) | |
1579 | { | |
7967b3e0 | 1580 | struct trace_subsystem_dir *dir = filp->private_data; |
8b372562 | 1581 | char *buf; |
cfb180f3 TZ |
1582 | int err; |
1583 | ||
8b372562 | 1584 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
1585 | return -EINVAL; |
1586 | ||
70f6cbb6 AV |
1587 | buf = memdup_user_nul(ubuf, cnt); |
1588 | if (IS_ERR(buf)) | |
1589 | return PTR_ERR(buf); | |
cfb180f3 | 1590 | |
ae63b31e | 1591 | err = apply_subsystem_event_filter(dir, buf); |
70f6cbb6 | 1592 | kfree(buf); |
8b372562 | 1593 | if (err < 0) |
44e9c8b7 | 1594 | return err; |
cfb180f3 TZ |
1595 | |
1596 | *ppos += cnt; | |
1597 | ||
1598 | return cnt; | |
1599 | } | |
1600 | ||
d1b182a8 SR |
1601 | static ssize_t |
1602 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1603 | { | |
1604 | int (*func)(struct trace_seq *s) = filp->private_data; | |
1605 | struct trace_seq *s; | |
1606 | int r; | |
1607 | ||
1608 | if (*ppos) | |
1609 | return 0; | |
1610 | ||
1611 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1612 | if (!s) | |
1613 | return -ENOMEM; | |
1614 | ||
1615 | trace_seq_init(s); | |
1616 | ||
1617 | func(s); | |
5ac48378 SRRH |
1618 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1619 | s->buffer, trace_seq_used(s)); | |
d1b182a8 SR |
1620 | |
1621 | kfree(s); | |
1622 | ||
1623 | return r; | |
1624 | } | |
1625 | ||
8ca532ad SRRH |
1626 | static void ignore_task_cpu(void *data) |
1627 | { | |
1628 | struct trace_array *tr = data; | |
1629 | struct trace_pid_list *pid_list; | |
1630 | ||
1631 | /* | |
1632 | * This function is called by on_each_cpu() while the | |
1633 | * event_mutex is held. | |
1634 | */ | |
1635 | pid_list = rcu_dereference_protected(tr->filtered_pids, | |
1636 | mutex_is_locked(&event_mutex)); | |
1637 | ||
1638 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
9ebc57cf | 1639 | ignore_this_task(pid_list, current)); |
8ca532ad SRRH |
1640 | } |
1641 | ||
49090107 | 1642 | static ssize_t |
3fdaf80f | 1643 | ftrace_event_pid_write(struct file *filp, const char __user *ubuf, |
49090107 SRRH |
1644 | size_t cnt, loff_t *ppos) |
1645 | { | |
3fdaf80f | 1646 | struct seq_file *m = filp->private_data; |
49090107 SRRH |
1647 | struct trace_array *tr = m->private; |
1648 | struct trace_pid_list *filtered_pids = NULL; | |
f4d34a87 | 1649 | struct trace_pid_list *pid_list; |
3fdaf80f | 1650 | struct trace_event_file *file; |
49090107 SRRH |
1651 | struct trace_parser parser; |
1652 | unsigned long val; | |
1653 | loff_t this_pos; | |
1654 | ssize_t read = 0; | |
1655 | ssize_t ret = 0; | |
1656 | pid_t pid; | |
f4d34a87 | 1657 | int nr_pids = 0; |
49090107 SRRH |
1658 | |
1659 | if (!cnt) | |
1660 | return 0; | |
1661 | ||
1662 | ret = tracing_update_buffers(); | |
1663 | if (ret < 0) | |
1664 | return ret; | |
1665 | ||
1666 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) | |
1667 | return -ENOMEM; | |
1668 | ||
1669 | mutex_lock(&event_mutex); | |
f4d34a87 SR |
1670 | filtered_pids = rcu_dereference_protected(tr->filtered_pids, |
1671 | lockdep_is_held(&event_mutex)); | |
1672 | ||
49090107 | 1673 | /* |
f4d34a87 SR |
1674 | * Always recreate a new array. The write is an all or nothing |
1675 | * operation. Always create a new array when adding new pids by | |
1676 | * the user. If the operation fails, then the current list is | |
1677 | * not modified. | |
49090107 | 1678 | */ |
f4d34a87 SR |
1679 | pid_list = kmalloc(sizeof(*pid_list), GFP_KERNEL); |
1680 | if (!pid_list) { | |
1681 | read = -ENOMEM; | |
1682 | goto out; | |
1683 | } | |
1684 | pid_list->pid_max = READ_ONCE(pid_max); | |
1685 | /* Only truncating will shrink pid_max */ | |
1686 | if (filtered_pids && filtered_pids->pid_max > pid_list->pid_max) | |
1687 | pid_list->pid_max = filtered_pids->pid_max; | |
1688 | pid_list->pids = vzalloc((pid_list->pid_max + 7) >> 3); | |
1689 | if (!pid_list->pids) { | |
1690 | kfree(pid_list); | |
1691 | read = -ENOMEM; | |
1692 | goto out; | |
1693 | } | |
1694 | if (filtered_pids) { | |
1695 | /* copy the current bits to the new max */ | |
1696 | pid = find_first_bit(filtered_pids->pids, | |
1697 | filtered_pids->pid_max); | |
1698 | while (pid < filtered_pids->pid_max) { | |
1699 | set_bit(pid, pid_list->pids); | |
1700 | pid = find_next_bit(filtered_pids->pids, | |
1701 | filtered_pids->pid_max, | |
1702 | pid + 1); | |
1703 | nr_pids++; | |
1704 | } | |
1705 | } | |
1706 | ||
49090107 SRRH |
1707 | while (cnt > 0) { |
1708 | ||
1709 | this_pos = 0; | |
1710 | ||
1711 | ret = trace_get_user(&parser, ubuf, cnt, &this_pos); | |
1712 | if (ret < 0 || !trace_parser_loaded(&parser)) | |
1713 | break; | |
1714 | ||
1715 | read += ret; | |
1716 | ubuf += ret; | |
1717 | cnt -= ret; | |
1718 | ||
1719 | parser.buffer[parser.idx] = 0; | |
1720 | ||
1721 | ret = -EINVAL; | |
1722 | if (kstrtoul(parser.buffer, 0, &val)) | |
1723 | break; | |
f4d34a87 | 1724 | if (val >= pid_list->pid_max) |
49090107 SRRH |
1725 | break; |
1726 | ||
1727 | pid = (pid_t)val; | |
1728 | ||
f4d34a87 SR |
1729 | set_bit(pid, pid_list->pids); |
1730 | nr_pids++; | |
49090107 | 1731 | |
49090107 SRRH |
1732 | trace_parser_clear(&parser); |
1733 | ret = 0; | |
1734 | } | |
1735 | trace_parser_put(&parser); | |
1736 | ||
1737 | if (ret < 0) { | |
f4d34a87 | 1738 | vfree(pid_list->pids); |
49090107 | 1739 | kfree(pid_list); |
f4d34a87 SR |
1740 | read = ret; |
1741 | goto out; | |
49090107 SRRH |
1742 | } |
1743 | ||
f4d34a87 SR |
1744 | if (!nr_pids) { |
1745 | /* Cleared the list of pids */ | |
1746 | vfree(pid_list->pids); | |
1747 | kfree(pid_list); | |
1748 | read = ret; | |
1749 | if (!filtered_pids) | |
1750 | goto out; | |
1751 | pid_list = NULL; | |
49090107 | 1752 | } |
49090107 SRRH |
1753 | rcu_assign_pointer(tr->filtered_pids, pid_list); |
1754 | ||
3fdaf80f SRRH |
1755 | list_for_each_entry(file, &tr->events, list) { |
1756 | set_bit(EVENT_FILE_FL_PID_FILTER_BIT, &file->flags); | |
1757 | } | |
49090107 SRRH |
1758 | |
1759 | if (filtered_pids) { | |
1760 | synchronize_sched(); | |
1761 | ||
f4d34a87 | 1762 | vfree(filtered_pids->pids); |
49090107 | 1763 | kfree(filtered_pids); |
3fdaf80f SRRH |
1764 | } else { |
1765 | /* | |
1766 | * Register a probe that is called before all other probes | |
1767 | * to set ignore_pid if next or prev do not match. | |
1768 | * Register a probe this is called after all other probes | |
1769 | * to only keep ignore_pid set if next pid matches. | |
1770 | */ | |
1771 | register_trace_prio_sched_switch(event_filter_pid_sched_switch_probe_pre, | |
1772 | tr, INT_MAX); | |
1773 | register_trace_prio_sched_switch(event_filter_pid_sched_switch_probe_post, | |
1774 | tr, 0); | |
1775 | ||
1776 | register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_pre, | |
1777 | tr, INT_MAX); | |
1778 | register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_post, | |
1779 | tr, 0); | |
0f72e37e SRRH |
1780 | |
1781 | register_trace_prio_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_pre, | |
1782 | tr, INT_MAX); | |
1783 | register_trace_prio_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_post, | |
1784 | tr, 0); | |
1785 | ||
1786 | register_trace_prio_sched_waking(event_filter_pid_sched_wakeup_probe_pre, | |
1787 | tr, INT_MAX); | |
1788 | register_trace_prio_sched_waking(event_filter_pid_sched_wakeup_probe_post, | |
1789 | tr, 0); | |
49090107 SRRH |
1790 | } |
1791 | ||
799fd44c SRRH |
1792 | /* |
1793 | * Ignoring of pids is done at task switch. But we have to | |
1794 | * check for those tasks that are currently running. | |
1795 | * Always do this in case a pid was appended or removed. | |
1796 | */ | |
1797 | on_each_cpu(ignore_task_cpu, tr, 1); | |
1798 | ||
f4d34a87 | 1799 | out: |
3fdaf80f SRRH |
1800 | mutex_unlock(&event_mutex); |
1801 | ||
49090107 | 1802 | ret = read; |
f4d34a87 SR |
1803 | if (read > 0) |
1804 | *ppos += read; | |
49090107 SRRH |
1805 | |
1806 | return ret; | |
1807 | } | |
1808 | ||
15075cac SR |
1809 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
1810 | static int ftrace_event_set_open(struct inode *inode, struct file *file); | |
49090107 | 1811 | static int ftrace_event_set_pid_open(struct inode *inode, struct file *file); |
f77d09a3 | 1812 | static int ftrace_event_release(struct inode *inode, struct file *file); |
15075cac | 1813 | |
b77e38aa SR |
1814 | static const struct seq_operations show_event_seq_ops = { |
1815 | .start = t_start, | |
1816 | .next = t_next, | |
1817 | .show = t_show, | |
1818 | .stop = t_stop, | |
1819 | }; | |
1820 | ||
1821 | static const struct seq_operations show_set_event_seq_ops = { | |
1822 | .start = s_start, | |
1823 | .next = s_next, | |
1824 | .show = t_show, | |
1825 | .stop = t_stop, | |
1826 | }; | |
1827 | ||
49090107 SRRH |
1828 | static const struct seq_operations show_set_pid_seq_ops = { |
1829 | .start = p_start, | |
1830 | .next = p_next, | |
1831 | .show = p_show, | |
1832 | .stop = p_stop, | |
1833 | }; | |
1834 | ||
2314c4ae | 1835 | static const struct file_operations ftrace_avail_fops = { |
15075cac | 1836 | .open = ftrace_event_avail_open, |
2314c4ae SR |
1837 | .read = seq_read, |
1838 | .llseek = seq_lseek, | |
1839 | .release = seq_release, | |
1840 | }; | |
1841 | ||
b77e38aa | 1842 | static const struct file_operations ftrace_set_event_fops = { |
15075cac | 1843 | .open = ftrace_event_set_open, |
b77e38aa SR |
1844 | .read = seq_read, |
1845 | .write = ftrace_event_write, | |
1846 | .llseek = seq_lseek, | |
f77d09a3 | 1847 | .release = ftrace_event_release, |
b77e38aa SR |
1848 | }; |
1849 | ||
49090107 SRRH |
1850 | static const struct file_operations ftrace_set_event_pid_fops = { |
1851 | .open = ftrace_event_set_pid_open, | |
1852 | .read = seq_read, | |
1853 | .write = ftrace_event_pid_write, | |
1854 | .llseek = seq_lseek, | |
1855 | .release = ftrace_event_release, | |
1856 | }; | |
1857 | ||
1473e441 | 1858 | static const struct file_operations ftrace_enable_fops = { |
bf682c31 | 1859 | .open = tracing_open_generic, |
1473e441 SR |
1860 | .read = event_enable_read, |
1861 | .write = event_enable_write, | |
6038f373 | 1862 | .llseek = default_llseek, |
1473e441 SR |
1863 | }; |
1864 | ||
981d081e | 1865 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
1866 | .open = trace_format_open, |
1867 | .read = seq_read, | |
1868 | .llseek = seq_lseek, | |
1869 | .release = seq_release, | |
981d081e SR |
1870 | }; |
1871 | ||
23725aee | 1872 | static const struct file_operations ftrace_event_id_fops = { |
23725aee | 1873 | .read = event_id_read, |
6038f373 | 1874 | .llseek = default_llseek, |
23725aee PZ |
1875 | }; |
1876 | ||
7ce7e424 TZ |
1877 | static const struct file_operations ftrace_event_filter_fops = { |
1878 | .open = tracing_open_generic, | |
1879 | .read = event_filter_read, | |
1880 | .write = event_filter_write, | |
6038f373 | 1881 | .llseek = default_llseek, |
7ce7e424 TZ |
1882 | }; |
1883 | ||
cfb180f3 | 1884 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 1885 | .open = subsystem_open, |
cfb180f3 TZ |
1886 | .read = subsystem_filter_read, |
1887 | .write = subsystem_filter_write, | |
6038f373 | 1888 | .llseek = default_llseek, |
e9dbfae5 | 1889 | .release = subsystem_release, |
cfb180f3 TZ |
1890 | }; |
1891 | ||
8ae79a13 | 1892 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 1893 | .open = subsystem_open, |
8ae79a13 SR |
1894 | .read = system_enable_read, |
1895 | .write = system_enable_write, | |
6038f373 | 1896 | .llseek = default_llseek, |
40ee4dff | 1897 | .release = subsystem_release, |
8ae79a13 SR |
1898 | }; |
1899 | ||
ae63b31e SR |
1900 | static const struct file_operations ftrace_tr_enable_fops = { |
1901 | .open = system_tr_open, | |
1902 | .read = system_enable_read, | |
1903 | .write = system_enable_write, | |
1904 | .llseek = default_llseek, | |
1905 | .release = subsystem_release, | |
1906 | }; | |
1907 | ||
d1b182a8 SR |
1908 | static const struct file_operations ftrace_show_header_fops = { |
1909 | .open = tracing_open_generic, | |
1910 | .read = show_header, | |
6038f373 | 1911 | .llseek = default_llseek, |
d1b182a8 SR |
1912 | }; |
1913 | ||
ae63b31e SR |
1914 | static int |
1915 | ftrace_event_open(struct inode *inode, struct file *file, | |
1916 | const struct seq_operations *seq_ops) | |
1473e441 | 1917 | { |
ae63b31e SR |
1918 | struct seq_file *m; |
1919 | int ret; | |
1473e441 | 1920 | |
ae63b31e SR |
1921 | ret = seq_open(file, seq_ops); |
1922 | if (ret < 0) | |
1923 | return ret; | |
1924 | m = file->private_data; | |
1925 | /* copy tr over to seq ops */ | |
1926 | m->private = inode->i_private; | |
1473e441 | 1927 | |
ae63b31e | 1928 | return ret; |
1473e441 SR |
1929 | } |
1930 | ||
f77d09a3 AL |
1931 | static int ftrace_event_release(struct inode *inode, struct file *file) |
1932 | { | |
1933 | struct trace_array *tr = inode->i_private; | |
1934 | ||
1935 | trace_array_put(tr); | |
1936 | ||
1937 | return seq_release(inode, file); | |
1938 | } | |
1939 | ||
15075cac SR |
1940 | static int |
1941 | ftrace_event_avail_open(struct inode *inode, struct file *file) | |
1942 | { | |
1943 | const struct seq_operations *seq_ops = &show_event_seq_ops; | |
1944 | ||
ae63b31e | 1945 | return ftrace_event_open(inode, file, seq_ops); |
15075cac SR |
1946 | } |
1947 | ||
1948 | static int | |
1949 | ftrace_event_set_open(struct inode *inode, struct file *file) | |
1950 | { | |
1951 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; | |
ae63b31e | 1952 | struct trace_array *tr = inode->i_private; |
f77d09a3 AL |
1953 | int ret; |
1954 | ||
1955 | if (trace_array_get(tr) < 0) | |
1956 | return -ENODEV; | |
15075cac SR |
1957 | |
1958 | if ((file->f_mode & FMODE_WRITE) && | |
1959 | (file->f_flags & O_TRUNC)) | |
ae63b31e | 1960 | ftrace_clear_events(tr); |
15075cac | 1961 | |
f77d09a3 AL |
1962 | ret = ftrace_event_open(inode, file, seq_ops); |
1963 | if (ret < 0) | |
1964 | trace_array_put(tr); | |
1965 | return ret; | |
ae63b31e SR |
1966 | } |
1967 | ||
49090107 SRRH |
1968 | static int |
1969 | ftrace_event_set_pid_open(struct inode *inode, struct file *file) | |
1970 | { | |
1971 | const struct seq_operations *seq_ops = &show_set_pid_seq_ops; | |
1972 | struct trace_array *tr = inode->i_private; | |
1973 | int ret; | |
1974 | ||
1975 | if (trace_array_get(tr) < 0) | |
1976 | return -ENODEV; | |
1977 | ||
1978 | if ((file->f_mode & FMODE_WRITE) && | |
1979 | (file->f_flags & O_TRUNC)) | |
1980 | ftrace_clear_event_pids(tr); | |
1981 | ||
1982 | ret = ftrace_event_open(inode, file, seq_ops); | |
1983 | if (ret < 0) | |
1984 | trace_array_put(tr); | |
1985 | return ret; | |
1986 | } | |
1987 | ||
ae63b31e SR |
1988 | static struct event_subsystem * |
1989 | create_new_subsystem(const char *name) | |
1990 | { | |
1991 | struct event_subsystem *system; | |
1992 | ||
1993 | /* need to create new entry */ | |
1994 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1995 | if (!system) | |
1996 | return NULL; | |
1997 | ||
1998 | system->ref_count = 1; | |
6e94a780 SR |
1999 | |
2000 | /* Only allocate if dynamic (kprobes and modules) */ | |
79ac6ef5 RV |
2001 | system->name = kstrdup_const(name, GFP_KERNEL); |
2002 | if (!system->name) | |
2003 | goto out_free; | |
ae63b31e SR |
2004 | |
2005 | system->filter = NULL; | |
2006 | ||
2007 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); | |
2008 | if (!system->filter) | |
2009 | goto out_free; | |
2010 | ||
2011 | list_add(&system->list, &event_subsystems); | |
2012 | ||
2013 | return system; | |
2014 | ||
2015 | out_free: | |
79ac6ef5 | 2016 | kfree_const(system->name); |
ae63b31e SR |
2017 | kfree(system); |
2018 | return NULL; | |
15075cac SR |
2019 | } |
2020 | ||
6ecc2d1c | 2021 | static struct dentry * |
ae63b31e | 2022 | event_subsystem_dir(struct trace_array *tr, const char *name, |
7f1d2f82 | 2023 | struct trace_event_file *file, struct dentry *parent) |
6ecc2d1c | 2024 | { |
7967b3e0 | 2025 | struct trace_subsystem_dir *dir; |
6ecc2d1c | 2026 | struct event_subsystem *system; |
e1112b4d | 2027 | struct dentry *entry; |
6ecc2d1c SR |
2028 | |
2029 | /* First see if we did not already create this dir */ | |
ae63b31e SR |
2030 | list_for_each_entry(dir, &tr->systems, list) { |
2031 | system = dir->subsystem; | |
dc82ec98 | 2032 | if (strcmp(system->name, name) == 0) { |
ae63b31e SR |
2033 | dir->nr_events++; |
2034 | file->system = dir; | |
2035 | return dir->entry; | |
dc82ec98 | 2036 | } |
6ecc2d1c SR |
2037 | } |
2038 | ||
ae63b31e SR |
2039 | /* Now see if the system itself exists. */ |
2040 | list_for_each_entry(system, &event_subsystems, list) { | |
2041 | if (strcmp(system->name, name) == 0) | |
2042 | break; | |
6ecc2d1c | 2043 | } |
ae63b31e SR |
2044 | /* Reset system variable when not found */ |
2045 | if (&system->list == &event_subsystems) | |
2046 | system = NULL; | |
6ecc2d1c | 2047 | |
ae63b31e SR |
2048 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
2049 | if (!dir) | |
2050 | goto out_fail; | |
6ecc2d1c | 2051 | |
ae63b31e SR |
2052 | if (!system) { |
2053 | system = create_new_subsystem(name); | |
2054 | if (!system) | |
2055 | goto out_free; | |
2056 | } else | |
2057 | __get_system(system); | |
2058 | ||
8434dc93 | 2059 | dir->entry = tracefs_create_dir(name, parent); |
ae63b31e | 2060 | if (!dir->entry) { |
3448bac3 | 2061 | pr_warn("Failed to create system directory %s\n", name); |
ae63b31e SR |
2062 | __put_system(system); |
2063 | goto out_free; | |
6d723736 SR |
2064 | } |
2065 | ||
ae63b31e SR |
2066 | dir->tr = tr; |
2067 | dir->ref_count = 1; | |
2068 | dir->nr_events = 1; | |
2069 | dir->subsystem = system; | |
2070 | file->system = dir; | |
8b372562 | 2071 | |
8434dc93 | 2072 | entry = tracefs_create_file("filter", 0644, dir->entry, dir, |
e1112b4d | 2073 | &ftrace_subsystem_filter_fops); |
8b372562 TZ |
2074 | if (!entry) { |
2075 | kfree(system->filter); | |
2076 | system->filter = NULL; | |
8434dc93 | 2077 | pr_warn("Could not create tracefs '%s/filter' entry\n", name); |
8b372562 | 2078 | } |
e1112b4d | 2079 | |
ae63b31e | 2080 | trace_create_file("enable", 0644, dir->entry, dir, |
f3f3f009 | 2081 | &ftrace_system_enable_fops); |
8ae79a13 | 2082 | |
ae63b31e SR |
2083 | list_add(&dir->list, &tr->systems); |
2084 | ||
2085 | return dir->entry; | |
2086 | ||
2087 | out_free: | |
2088 | kfree(dir); | |
2089 | out_fail: | |
2090 | /* Only print this message if failed on memory allocation */ | |
2091 | if (!dir || !system) | |
3448bac3 | 2092 | pr_warn("No memory to create event subsystem %s\n", name); |
ae63b31e | 2093 | return NULL; |
6ecc2d1c SR |
2094 | } |
2095 | ||
1473e441 | 2096 | static int |
7f1d2f82 | 2097 | event_create_dir(struct dentry *parent, struct trace_event_file *file) |
1473e441 | 2098 | { |
2425bcb9 | 2099 | struct trace_event_call *call = file->event_call; |
ae63b31e | 2100 | struct trace_array *tr = file->tr; |
2e33af02 | 2101 | struct list_head *head; |
ae63b31e | 2102 | struct dentry *d_events; |
de7b2973 | 2103 | const char *name; |
fd994989 | 2104 | int ret; |
1473e441 | 2105 | |
6ecc2d1c SR |
2106 | /* |
2107 | * If the trace point header did not define TRACE_SYSTEM | |
2108 | * then the system would be called "TRACE_SYSTEM". | |
2109 | */ | |
ae63b31e SR |
2110 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { |
2111 | d_events = event_subsystem_dir(tr, call->class->system, file, parent); | |
2112 | if (!d_events) | |
2113 | return -ENOMEM; | |
2114 | } else | |
2115 | d_events = parent; | |
2116 | ||
687fcc4a | 2117 | name = trace_event_name(call); |
8434dc93 | 2118 | file->dir = tracefs_create_dir(name, d_events); |
ae63b31e | 2119 | if (!file->dir) { |
8434dc93 | 2120 | pr_warn("Could not create tracefs '%s' directory\n", name); |
1473e441 SR |
2121 | return -1; |
2122 | } | |
2123 | ||
9b63776f | 2124 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
ae63b31e | 2125 | trace_create_file("enable", 0644, file->dir, file, |
620a30e9 | 2126 | &ftrace_enable_fops); |
1473e441 | 2127 | |
2239291a | 2128 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 2129 | if (call->event.type && call->class->reg) |
1a11126b | 2130 | trace_create_file("id", 0444, file->dir, |
620a30e9 ON |
2131 | (void *)(long)call->event.type, |
2132 | &ftrace_event_id_fops); | |
2239291a | 2133 | #endif |
23725aee | 2134 | |
c9d932cf LZ |
2135 | /* |
2136 | * Other events may have the same class. Only update | |
2137 | * the fields if they are not already defined. | |
2138 | */ | |
2139 | head = trace_get_fields(call); | |
2140 | if (list_empty(head)) { | |
2141 | ret = call->class->define_fields(call); | |
2142 | if (ret < 0) { | |
3448bac3 FF |
2143 | pr_warn("Could not initialize trace point events/%s\n", |
2144 | name); | |
ae63b31e | 2145 | return -1; |
cf027f64 TZ |
2146 | } |
2147 | } | |
f306cc82 | 2148 | trace_create_file("filter", 0644, file->dir, file, |
620a30e9 | 2149 | &ftrace_event_filter_fops); |
cf027f64 | 2150 | |
85f2b082 TZ |
2151 | trace_create_file("trigger", 0644, file->dir, file, |
2152 | &event_trigger_fops); | |
2153 | ||
7ef224d1 TZ |
2154 | #ifdef CONFIG_HIST_TRIGGERS |
2155 | trace_create_file("hist", 0444, file->dir, file, | |
2156 | &event_hist_fops); | |
2157 | #endif | |
ae63b31e | 2158 | trace_create_file("format", 0444, file->dir, call, |
620a30e9 | 2159 | &ftrace_event_format_fops); |
6d723736 SR |
2160 | |
2161 | return 0; | |
2162 | } | |
2163 | ||
2425bcb9 | 2164 | static void remove_event_from_tracers(struct trace_event_call *call) |
ae63b31e | 2165 | { |
7f1d2f82 | 2166 | struct trace_event_file *file; |
ae63b31e SR |
2167 | struct trace_array *tr; |
2168 | ||
2169 | do_for_each_event_file_safe(tr, file) { | |
ae63b31e SR |
2170 | if (file->event_call != call) |
2171 | continue; | |
2172 | ||
f6a84bdc | 2173 | remove_event_file_dir(file); |
ae63b31e SR |
2174 | /* |
2175 | * The do_for_each_event_file_safe() is | |
2176 | * a double loop. After finding the call for this | |
2177 | * trace_array, we use break to jump to the next | |
2178 | * trace_array. | |
2179 | */ | |
2180 | break; | |
2181 | } while_for_each_event_file(); | |
2182 | } | |
2183 | ||
2425bcb9 | 2184 | static void event_remove(struct trace_event_call *call) |
8781915a | 2185 | { |
ae63b31e | 2186 | struct trace_array *tr; |
7f1d2f82 | 2187 | struct trace_event_file *file; |
ae63b31e SR |
2188 | |
2189 | do_for_each_event_file(tr, file) { | |
2190 | if (file->event_call != call) | |
2191 | continue; | |
2192 | ftrace_event_enable_disable(file, 0); | |
2193 | /* | |
2194 | * The do_for_each_event_file() is | |
2195 | * a double loop. After finding the call for this | |
2196 | * trace_array, we use break to jump to the next | |
2197 | * trace_array. | |
2198 | */ | |
2199 | break; | |
2200 | } while_for_each_event_file(); | |
2201 | ||
8781915a | 2202 | if (call->event.funcs) |
9023c930 | 2203 | __unregister_trace_event(&call->event); |
ae63b31e | 2204 | remove_event_from_tracers(call); |
8781915a EG |
2205 | list_del(&call->list); |
2206 | } | |
2207 | ||
2425bcb9 | 2208 | static int event_init(struct trace_event_call *call) |
8781915a EG |
2209 | { |
2210 | int ret = 0; | |
de7b2973 | 2211 | const char *name; |
8781915a | 2212 | |
687fcc4a | 2213 | name = trace_event_name(call); |
de7b2973 | 2214 | if (WARN_ON(!name)) |
8781915a EG |
2215 | return -EINVAL; |
2216 | ||
2217 | if (call->class->raw_init) { | |
2218 | ret = call->class->raw_init(call); | |
2219 | if (ret < 0 && ret != -ENOSYS) | |
3448bac3 | 2220 | pr_warn("Could not initialize trace events/%s\n", name); |
8781915a EG |
2221 | } |
2222 | ||
2223 | return ret; | |
2224 | } | |
2225 | ||
67ead0a6 | 2226 | static int |
2425bcb9 | 2227 | __register_event(struct trace_event_call *call, struct module *mod) |
bd1a5c84 | 2228 | { |
bd1a5c84 | 2229 | int ret; |
6d723736 | 2230 | |
8781915a EG |
2231 | ret = event_init(call); |
2232 | if (ret < 0) | |
2233 | return ret; | |
701970b3 | 2234 | |
ae63b31e | 2235 | list_add(&call->list, &ftrace_events); |
67ead0a6 | 2236 | call->mod = mod; |
88f70d75 | 2237 | |
ae63b31e | 2238 | return 0; |
bd1a5c84 MH |
2239 | } |
2240 | ||
0c564a53 SRRH |
2241 | static char *enum_replace(char *ptr, struct trace_enum_map *map, int len) |
2242 | { | |
2243 | int rlen; | |
2244 | int elen; | |
2245 | ||
2246 | /* Find the length of the enum value as a string */ | |
2247 | elen = snprintf(ptr, 0, "%ld", map->enum_value); | |
2248 | /* Make sure there's enough room to replace the string with the value */ | |
2249 | if (len < elen) | |
2250 | return NULL; | |
2251 | ||
2252 | snprintf(ptr, elen + 1, "%ld", map->enum_value); | |
2253 | ||
2254 | /* Get the rest of the string of ptr */ | |
2255 | rlen = strlen(ptr + len); | |
2256 | memmove(ptr + elen, ptr + len, rlen); | |
2257 | /* Make sure we end the new string */ | |
2258 | ptr[elen + rlen] = 0; | |
2259 | ||
2260 | return ptr + elen; | |
2261 | } | |
2262 | ||
2425bcb9 | 2263 | static void update_event_printk(struct trace_event_call *call, |
0c564a53 SRRH |
2264 | struct trace_enum_map *map) |
2265 | { | |
2266 | char *ptr; | |
2267 | int quote = 0; | |
2268 | int len = strlen(map->enum_string); | |
2269 | ||
2270 | for (ptr = call->print_fmt; *ptr; ptr++) { | |
2271 | if (*ptr == '\\') { | |
2272 | ptr++; | |
2273 | /* paranoid */ | |
2274 | if (!*ptr) | |
2275 | break; | |
2276 | continue; | |
2277 | } | |
2278 | if (*ptr == '"') { | |
2279 | quote ^= 1; | |
2280 | continue; | |
2281 | } | |
2282 | if (quote) | |
2283 | continue; | |
2284 | if (isdigit(*ptr)) { | |
2285 | /* skip numbers */ | |
2286 | do { | |
2287 | ptr++; | |
2288 | /* Check for alpha chars like ULL */ | |
2289 | } while (isalnum(*ptr)); | |
3193899d SRRH |
2290 | if (!*ptr) |
2291 | break; | |
0c564a53 SRRH |
2292 | /* |
2293 | * A number must have some kind of delimiter after | |
2294 | * it, and we can ignore that too. | |
2295 | */ | |
2296 | continue; | |
2297 | } | |
2298 | if (isalpha(*ptr) || *ptr == '_') { | |
2299 | if (strncmp(map->enum_string, ptr, len) == 0 && | |
2300 | !isalnum(ptr[len]) && ptr[len] != '_') { | |
2301 | ptr = enum_replace(ptr, map, len); | |
2302 | /* Hmm, enum string smaller than value */ | |
2303 | if (WARN_ON_ONCE(!ptr)) | |
2304 | return; | |
2305 | /* | |
2306 | * No need to decrement here, as enum_replace() | |
2307 | * returns the pointer to the character passed | |
2308 | * the enum, and two enums can not be placed | |
2309 | * back to back without something in between. | |
2310 | * We can skip that something in between. | |
2311 | */ | |
2312 | continue; | |
2313 | } | |
2314 | skip_more: | |
2315 | do { | |
2316 | ptr++; | |
2317 | } while (isalnum(*ptr) || *ptr == '_'); | |
3193899d SRRH |
2318 | if (!*ptr) |
2319 | break; | |
0c564a53 SRRH |
2320 | /* |
2321 | * If what comes after this variable is a '.' or | |
2322 | * '->' then we can continue to ignore that string. | |
2323 | */ | |
2324 | if (*ptr == '.' || (ptr[0] == '-' && ptr[1] == '>')) { | |
2325 | ptr += *ptr == '.' ? 1 : 2; | |
3193899d SRRH |
2326 | if (!*ptr) |
2327 | break; | |
0c564a53 SRRH |
2328 | goto skip_more; |
2329 | } | |
2330 | /* | |
2331 | * Once again, we can skip the delimiter that came | |
2332 | * after the string. | |
2333 | */ | |
2334 | continue; | |
2335 | } | |
2336 | } | |
2337 | } | |
2338 | ||
2339 | void trace_event_enum_update(struct trace_enum_map **map, int len) | |
2340 | { | |
2425bcb9 | 2341 | struct trace_event_call *call, *p; |
0c564a53 SRRH |
2342 | const char *last_system = NULL; |
2343 | int last_i; | |
2344 | int i; | |
2345 | ||
2346 | down_write(&trace_event_sem); | |
2347 | list_for_each_entry_safe(call, p, &ftrace_events, list) { | |
2348 | /* events are usually grouped together with systems */ | |
2349 | if (!last_system || call->class->system != last_system) { | |
2350 | last_i = 0; | |
2351 | last_system = call->class->system; | |
2352 | } | |
2353 | ||
2354 | for (i = last_i; i < len; i++) { | |
2355 | if (call->class->system == map[i]->system) { | |
2356 | /* Save the first system if need be */ | |
2357 | if (!last_i) | |
2358 | last_i = i; | |
2359 | update_event_printk(call, map[i]); | |
2360 | } | |
2361 | } | |
2362 | } | |
2363 | up_write(&trace_event_sem); | |
2364 | } | |
2365 | ||
7f1d2f82 | 2366 | static struct trace_event_file * |
2425bcb9 | 2367 | trace_create_new_event(struct trace_event_call *call, |
da511bf3 SRRH |
2368 | struct trace_array *tr) |
2369 | { | |
7f1d2f82 | 2370 | struct trace_event_file *file; |
da511bf3 SRRH |
2371 | |
2372 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); | |
2373 | if (!file) | |
2374 | return NULL; | |
2375 | ||
2376 | file->event_call = call; | |
2377 | file->tr = tr; | |
2378 | atomic_set(&file->sm_ref, 0); | |
85f2b082 TZ |
2379 | atomic_set(&file->tm_ref, 0); |
2380 | INIT_LIST_HEAD(&file->triggers); | |
da511bf3 SRRH |
2381 | list_add(&file->list, &tr->events); |
2382 | ||
2383 | return file; | |
2384 | } | |
2385 | ||
ae63b31e SR |
2386 | /* Add an event to a trace directory */ |
2387 | static int | |
2425bcb9 | 2388 | __trace_add_new_event(struct trace_event_call *call, struct trace_array *tr) |
ae63b31e | 2389 | { |
7f1d2f82 | 2390 | struct trace_event_file *file; |
ae63b31e | 2391 | |
da511bf3 | 2392 | file = trace_create_new_event(call, tr); |
ae63b31e SR |
2393 | if (!file) |
2394 | return -ENOMEM; | |
2395 | ||
620a30e9 | 2396 | return event_create_dir(tr->event_dir, file); |
ae63b31e SR |
2397 | } |
2398 | ||
77248221 SR |
2399 | /* |
2400 | * Just create a decriptor for early init. A descriptor is required | |
2401 | * for enabling events at boot. We want to enable events before | |
2402 | * the filesystem is initialized. | |
2403 | */ | |
2404 | static __init int | |
2425bcb9 | 2405 | __trace_early_add_new_event(struct trace_event_call *call, |
77248221 SR |
2406 | struct trace_array *tr) |
2407 | { | |
7f1d2f82 | 2408 | struct trace_event_file *file; |
77248221 | 2409 | |
da511bf3 | 2410 | file = trace_create_new_event(call, tr); |
77248221 SR |
2411 | if (!file) |
2412 | return -ENOMEM; | |
2413 | ||
77248221 SR |
2414 | return 0; |
2415 | } | |
2416 | ||
ae63b31e | 2417 | struct ftrace_module_file_ops; |
2425bcb9 | 2418 | static void __add_event_to_tracers(struct trace_event_call *call); |
ae63b31e | 2419 | |
bd1a5c84 | 2420 | /* Add an additional event_call dynamically */ |
2425bcb9 | 2421 | int trace_add_event_call(struct trace_event_call *call) |
bd1a5c84 MH |
2422 | { |
2423 | int ret; | |
a8227415 | 2424 | mutex_lock(&trace_types_lock); |
bd1a5c84 | 2425 | mutex_lock(&event_mutex); |
701970b3 | 2426 | |
ae63b31e SR |
2427 | ret = __register_event(call, NULL); |
2428 | if (ret >= 0) | |
779c5e37 | 2429 | __add_event_to_tracers(call); |
a2ca5e03 | 2430 | |
ae63b31e | 2431 | mutex_unlock(&event_mutex); |
a8227415 | 2432 | mutex_unlock(&trace_types_lock); |
ae63b31e | 2433 | return ret; |
a2ca5e03 FW |
2434 | } |
2435 | ||
4fead8e4 | 2436 | /* |
a8227415 AL |
2437 | * Must be called under locking of trace_types_lock, event_mutex and |
2438 | * trace_event_sem. | |
4fead8e4 | 2439 | */ |
2425bcb9 | 2440 | static void __trace_remove_event_call(struct trace_event_call *call) |
bd1a5c84 | 2441 | { |
8781915a | 2442 | event_remove(call); |
bd1a5c84 | 2443 | trace_destroy_fields(call); |
57375747 ON |
2444 | free_event_filter(call->filter); |
2445 | call->filter = NULL; | |
bd1a5c84 MH |
2446 | } |
2447 | ||
2425bcb9 | 2448 | static int probe_remove_event_call(struct trace_event_call *call) |
2816c551 ON |
2449 | { |
2450 | struct trace_array *tr; | |
7f1d2f82 | 2451 | struct trace_event_file *file; |
2816c551 ON |
2452 | |
2453 | #ifdef CONFIG_PERF_EVENTS | |
2454 | if (call->perf_refcount) | |
2455 | return -EBUSY; | |
2456 | #endif | |
2457 | do_for_each_event_file(tr, file) { | |
2458 | if (file->event_call != call) | |
2459 | continue; | |
2460 | /* | |
2461 | * We can't rely on ftrace_event_enable_disable(enable => 0) | |
5d6ad960 | 2462 | * we are going to do, EVENT_FILE_FL_SOFT_MODE can suppress |
2816c551 ON |
2463 | * TRACE_REG_UNREGISTER. |
2464 | */ | |
5d6ad960 | 2465 | if (file->flags & EVENT_FILE_FL_ENABLED) |
2816c551 | 2466 | return -EBUSY; |
2ba64035 SRRH |
2467 | /* |
2468 | * The do_for_each_event_file_safe() is | |
2469 | * a double loop. After finding the call for this | |
2470 | * trace_array, we use break to jump to the next | |
2471 | * trace_array. | |
2472 | */ | |
2816c551 ON |
2473 | break; |
2474 | } while_for_each_event_file(); | |
2475 | ||
2476 | __trace_remove_event_call(call); | |
2477 | ||
2478 | return 0; | |
2479 | } | |
2480 | ||
bd1a5c84 | 2481 | /* Remove an event_call */ |
2425bcb9 | 2482 | int trace_remove_event_call(struct trace_event_call *call) |
bd1a5c84 | 2483 | { |
2816c551 ON |
2484 | int ret; |
2485 | ||
a8227415 | 2486 | mutex_lock(&trace_types_lock); |
bd1a5c84 | 2487 | mutex_lock(&event_mutex); |
52f6ad6d | 2488 | down_write(&trace_event_sem); |
2816c551 | 2489 | ret = probe_remove_event_call(call); |
52f6ad6d | 2490 | up_write(&trace_event_sem); |
bd1a5c84 | 2491 | mutex_unlock(&event_mutex); |
a8227415 | 2492 | mutex_unlock(&trace_types_lock); |
2816c551 ON |
2493 | |
2494 | return ret; | |
bd1a5c84 MH |
2495 | } |
2496 | ||
2497 | #define for_each_event(event, start, end) \ | |
2498 | for (event = start; \ | |
2499 | (unsigned long)event < (unsigned long)end; \ | |
2500 | event++) | |
2501 | ||
2502 | #ifdef CONFIG_MODULES | |
2503 | ||
6d723736 SR |
2504 | static void trace_module_add_events(struct module *mod) |
2505 | { | |
2425bcb9 | 2506 | struct trace_event_call **call, **start, **end; |
6d723736 | 2507 | |
45ab2813 SRRH |
2508 | if (!mod->num_trace_events) |
2509 | return; | |
2510 | ||
2511 | /* Don't add infrastructure for mods without tracepoints */ | |
2512 | if (trace_module_has_bad_taint(mod)) { | |
2513 | pr_err("%s: module has bad taint, not creating trace events\n", | |
2514 | mod->name); | |
2515 | return; | |
2516 | } | |
2517 | ||
6d723736 SR |
2518 | start = mod->trace_events; |
2519 | end = mod->trace_events + mod->num_trace_events; | |
2520 | ||
6d723736 | 2521 | for_each_event(call, start, end) { |
ae63b31e | 2522 | __register_event(*call, mod); |
779c5e37 | 2523 | __add_event_to_tracers(*call); |
6d723736 SR |
2524 | } |
2525 | } | |
2526 | ||
2527 | static void trace_module_remove_events(struct module *mod) | |
2528 | { | |
2425bcb9 | 2529 | struct trace_event_call *call, *p; |
575380da | 2530 | bool clear_trace = false; |
6d723736 | 2531 | |
52f6ad6d | 2532 | down_write(&trace_event_sem); |
6d723736 SR |
2533 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
2534 | if (call->mod == mod) { | |
575380da SRRH |
2535 | if (call->flags & TRACE_EVENT_FL_WAS_ENABLED) |
2536 | clear_trace = true; | |
bd1a5c84 | 2537 | __trace_remove_event_call(call); |
6d723736 SR |
2538 | } |
2539 | } | |
52f6ad6d | 2540 | up_write(&trace_event_sem); |
9456f0fa SR |
2541 | |
2542 | /* | |
2543 | * It is safest to reset the ring buffer if the module being unloaded | |
873c642f SRRH |
2544 | * registered any events that were used. The only worry is if |
2545 | * a new module gets loaded, and takes on the same id as the events | |
2546 | * of this module. When printing out the buffer, traced events left | |
2547 | * over from this module may be passed to the new module events and | |
2548 | * unexpected results may occur. | |
9456f0fa | 2549 | */ |
575380da | 2550 | if (clear_trace) |
873c642f | 2551 | tracing_reset_all_online_cpus(); |
6d723736 SR |
2552 | } |
2553 | ||
61f919a1 SR |
2554 | static int trace_module_notify(struct notifier_block *self, |
2555 | unsigned long val, void *data) | |
6d723736 SR |
2556 | { |
2557 | struct module *mod = data; | |
2558 | ||
a8227415 | 2559 | mutex_lock(&trace_types_lock); |
6d723736 SR |
2560 | mutex_lock(&event_mutex); |
2561 | switch (val) { | |
2562 | case MODULE_STATE_COMING: | |
2563 | trace_module_add_events(mod); | |
2564 | break; | |
2565 | case MODULE_STATE_GOING: | |
2566 | trace_module_remove_events(mod); | |
2567 | break; | |
2568 | } | |
2569 | mutex_unlock(&event_mutex); | |
a8227415 | 2570 | mutex_unlock(&trace_types_lock); |
fd994989 | 2571 | |
1473e441 SR |
2572 | return 0; |
2573 | } | |
315326c1 | 2574 | |
836d481e ON |
2575 | static struct notifier_block trace_module_nb = { |
2576 | .notifier_call = trace_module_notify, | |
3673b8e4 | 2577 | .priority = 1, /* higher than trace.c module notify */ |
836d481e | 2578 | }; |
61f919a1 | 2579 | #endif /* CONFIG_MODULES */ |
1473e441 | 2580 | |
ae63b31e SR |
2581 | /* Create a new event directory structure for a trace directory. */ |
2582 | static void | |
2583 | __trace_add_event_dirs(struct trace_array *tr) | |
2584 | { | |
2425bcb9 | 2585 | struct trace_event_call *call; |
ae63b31e SR |
2586 | int ret; |
2587 | ||
2588 | list_for_each_entry(call, &ftrace_events, list) { | |
620a30e9 | 2589 | ret = __trace_add_new_event(call, tr); |
ae63b31e | 2590 | if (ret < 0) |
3448bac3 | 2591 | pr_warn("Could not create directory for event %s\n", |
687fcc4a | 2592 | trace_event_name(call)); |
ae63b31e SR |
2593 | } |
2594 | } | |
2595 | ||
7f1d2f82 | 2596 | struct trace_event_file * |
3cd715de SRRH |
2597 | find_event_file(struct trace_array *tr, const char *system, const char *event) |
2598 | { | |
7f1d2f82 | 2599 | struct trace_event_file *file; |
2425bcb9 | 2600 | struct trace_event_call *call; |
de7b2973 | 2601 | const char *name; |
3cd715de SRRH |
2602 | |
2603 | list_for_each_entry(file, &tr->events, list) { | |
2604 | ||
2605 | call = file->event_call; | |
687fcc4a | 2606 | name = trace_event_name(call); |
3cd715de | 2607 | |
de7b2973 | 2608 | if (!name || !call->class || !call->class->reg) |
3cd715de SRRH |
2609 | continue; |
2610 | ||
2611 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) | |
2612 | continue; | |
2613 | ||
de7b2973 | 2614 | if (strcmp(event, name) == 0 && |
3cd715de SRRH |
2615 | strcmp(system, call->class->system) == 0) |
2616 | return file; | |
2617 | } | |
2618 | return NULL; | |
2619 | } | |
2620 | ||
2875a08b SRRH |
2621 | #ifdef CONFIG_DYNAMIC_FTRACE |
2622 | ||
2623 | /* Avoid typos */ | |
2624 | #define ENABLE_EVENT_STR "enable_event" | |
2625 | #define DISABLE_EVENT_STR "disable_event" | |
2626 | ||
2627 | struct event_probe_data { | |
7f1d2f82 | 2628 | struct trace_event_file *file; |
2875a08b SRRH |
2629 | unsigned long count; |
2630 | int ref; | |
2631 | bool enable; | |
2632 | }; | |
2633 | ||
3cd715de SRRH |
2634 | static void |
2635 | event_enable_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
2636 | { | |
2637 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2638 | struct event_probe_data *data = *pdata; | |
2639 | ||
2640 | if (!data) | |
2641 | return; | |
2642 | ||
2643 | if (data->enable) | |
5d6ad960 | 2644 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); |
3cd715de | 2645 | else |
5d6ad960 | 2646 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); |
3cd715de SRRH |
2647 | } |
2648 | ||
2649 | static void | |
2650 | event_enable_count_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
2651 | { | |
2652 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2653 | struct event_probe_data *data = *pdata; | |
2654 | ||
2655 | if (!data) | |
2656 | return; | |
2657 | ||
2658 | if (!data->count) | |
2659 | return; | |
2660 | ||
2661 | /* Skip if the event is in a state we want to switch to */ | |
5d6ad960 | 2662 | if (data->enable == !(data->file->flags & EVENT_FILE_FL_SOFT_DISABLED)) |
3cd715de SRRH |
2663 | return; |
2664 | ||
2665 | if (data->count != -1) | |
2666 | (data->count)--; | |
2667 | ||
2668 | event_enable_probe(ip, parent_ip, _data); | |
2669 | } | |
2670 | ||
2671 | static int | |
2672 | event_enable_print(struct seq_file *m, unsigned long ip, | |
2673 | struct ftrace_probe_ops *ops, void *_data) | |
2674 | { | |
2675 | struct event_probe_data *data = _data; | |
2676 | ||
2677 | seq_printf(m, "%ps:", (void *)ip); | |
2678 | ||
2679 | seq_printf(m, "%s:%s:%s", | |
2680 | data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR, | |
2681 | data->file->event_call->class->system, | |
687fcc4a | 2682 | trace_event_name(data->file->event_call)); |
3cd715de SRRH |
2683 | |
2684 | if (data->count == -1) | |
fa6f0cc7 | 2685 | seq_puts(m, ":unlimited\n"); |
3cd715de SRRH |
2686 | else |
2687 | seq_printf(m, ":count=%ld\n", data->count); | |
2688 | ||
2689 | return 0; | |
2690 | } | |
2691 | ||
2692 | static int | |
2693 | event_enable_init(struct ftrace_probe_ops *ops, unsigned long ip, | |
2694 | void **_data) | |
2695 | { | |
2696 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2697 | struct event_probe_data *data = *pdata; | |
2698 | ||
2699 | data->ref++; | |
2700 | return 0; | |
2701 | } | |
2702 | ||
2703 | static void | |
2704 | event_enable_free(struct ftrace_probe_ops *ops, unsigned long ip, | |
2705 | void **_data) | |
2706 | { | |
2707 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2708 | struct event_probe_data *data = *pdata; | |
2709 | ||
2710 | if (WARN_ON_ONCE(data->ref <= 0)) | |
2711 | return; | |
2712 | ||
2713 | data->ref--; | |
2714 | if (!data->ref) { | |
2715 | /* Remove the SOFT_MODE flag */ | |
2716 | __ftrace_event_enable_disable(data->file, 0, 1); | |
2717 | module_put(data->file->event_call->mod); | |
2718 | kfree(data); | |
2719 | } | |
2720 | *pdata = NULL; | |
2721 | } | |
2722 | ||
2723 | static struct ftrace_probe_ops event_enable_probe_ops = { | |
2724 | .func = event_enable_probe, | |
2725 | .print = event_enable_print, | |
2726 | .init = event_enable_init, | |
2727 | .free = event_enable_free, | |
2728 | }; | |
2729 | ||
2730 | static struct ftrace_probe_ops event_enable_count_probe_ops = { | |
2731 | .func = event_enable_count_probe, | |
2732 | .print = event_enable_print, | |
2733 | .init = event_enable_init, | |
2734 | .free = event_enable_free, | |
2735 | }; | |
2736 | ||
2737 | static struct ftrace_probe_ops event_disable_probe_ops = { | |
2738 | .func = event_enable_probe, | |
2739 | .print = event_enable_print, | |
2740 | .init = event_enable_init, | |
2741 | .free = event_enable_free, | |
2742 | }; | |
2743 | ||
2744 | static struct ftrace_probe_ops event_disable_count_probe_ops = { | |
2745 | .func = event_enable_count_probe, | |
2746 | .print = event_enable_print, | |
2747 | .init = event_enable_init, | |
2748 | .free = event_enable_free, | |
2749 | }; | |
2750 | ||
2751 | static int | |
2752 | event_enable_func(struct ftrace_hash *hash, | |
2753 | char *glob, char *cmd, char *param, int enabled) | |
2754 | { | |
2755 | struct trace_array *tr = top_trace_array(); | |
7f1d2f82 | 2756 | struct trace_event_file *file; |
3cd715de SRRH |
2757 | struct ftrace_probe_ops *ops; |
2758 | struct event_probe_data *data; | |
2759 | const char *system; | |
2760 | const char *event; | |
2761 | char *number; | |
2762 | bool enable; | |
2763 | int ret; | |
2764 | ||
dc81e5e3 YY |
2765 | if (!tr) |
2766 | return -ENODEV; | |
2767 | ||
3cd715de | 2768 | /* hash funcs only work with set_ftrace_filter */ |
8092e808 | 2769 | if (!enabled || !param) |
3cd715de SRRH |
2770 | return -EINVAL; |
2771 | ||
2772 | system = strsep(¶m, ":"); | |
2773 | if (!param) | |
2774 | return -EINVAL; | |
2775 | ||
2776 | event = strsep(¶m, ":"); | |
2777 | ||
2778 | mutex_lock(&event_mutex); | |
2779 | ||
2780 | ret = -EINVAL; | |
2781 | file = find_event_file(tr, system, event); | |
2782 | if (!file) | |
2783 | goto out; | |
2784 | ||
2785 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; | |
2786 | ||
2787 | if (enable) | |
2788 | ops = param ? &event_enable_count_probe_ops : &event_enable_probe_ops; | |
2789 | else | |
2790 | ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops; | |
2791 | ||
2792 | if (glob[0] == '!') { | |
2793 | unregister_ftrace_function_probe_func(glob+1, ops); | |
2794 | ret = 0; | |
2795 | goto out; | |
2796 | } | |
2797 | ||
2798 | ret = -ENOMEM; | |
2799 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
2800 | if (!data) | |
2801 | goto out; | |
2802 | ||
2803 | data->enable = enable; | |
2804 | data->count = -1; | |
2805 | data->file = file; | |
2806 | ||
2807 | if (!param) | |
2808 | goto out_reg; | |
2809 | ||
2810 | number = strsep(¶m, ":"); | |
2811 | ||
2812 | ret = -EINVAL; | |
2813 | if (!strlen(number)) | |
2814 | goto out_free; | |
2815 | ||
2816 | /* | |
2817 | * We use the callback data field (which is a pointer) | |
2818 | * as our counter. | |
2819 | */ | |
2820 | ret = kstrtoul(number, 0, &data->count); | |
2821 | if (ret) | |
2822 | goto out_free; | |
2823 | ||
2824 | out_reg: | |
2825 | /* Don't let event modules unload while probe registered */ | |
2826 | ret = try_module_get(file->event_call->mod); | |
6ed01066 MH |
2827 | if (!ret) { |
2828 | ret = -EBUSY; | |
3cd715de | 2829 | goto out_free; |
6ed01066 | 2830 | } |
3cd715de SRRH |
2831 | |
2832 | ret = __ftrace_event_enable_disable(file, 1, 1); | |
2833 | if (ret < 0) | |
2834 | goto out_put; | |
2835 | ret = register_ftrace_function_probe(glob, ops, data); | |
ff305ded SRRH |
2836 | /* |
2837 | * The above returns on success the # of functions enabled, | |
2838 | * but if it didn't find any functions it returns zero. | |
2839 | * Consider no functions a failure too. | |
2840 | */ | |
a5b85bd1 MH |
2841 | if (!ret) { |
2842 | ret = -ENOENT; | |
3cd715de | 2843 | goto out_disable; |
ff305ded SRRH |
2844 | } else if (ret < 0) |
2845 | goto out_disable; | |
2846 | /* Just return zero, not the number of enabled functions */ | |
2847 | ret = 0; | |
3cd715de SRRH |
2848 | out: |
2849 | mutex_unlock(&event_mutex); | |
2850 | return ret; | |
2851 | ||
2852 | out_disable: | |
2853 | __ftrace_event_enable_disable(file, 0, 1); | |
2854 | out_put: | |
2855 | module_put(file->event_call->mod); | |
2856 | out_free: | |
2857 | kfree(data); | |
2858 | goto out; | |
2859 | } | |
2860 | ||
2861 | static struct ftrace_func_command event_enable_cmd = { | |
2862 | .name = ENABLE_EVENT_STR, | |
2863 | .func = event_enable_func, | |
2864 | }; | |
2865 | ||
2866 | static struct ftrace_func_command event_disable_cmd = { | |
2867 | .name = DISABLE_EVENT_STR, | |
2868 | .func = event_enable_func, | |
2869 | }; | |
2870 | ||
2871 | static __init int register_event_cmds(void) | |
2872 | { | |
2873 | int ret; | |
2874 | ||
2875 | ret = register_ftrace_command(&event_enable_cmd); | |
2876 | if (WARN_ON(ret < 0)) | |
2877 | return ret; | |
2878 | ret = register_ftrace_command(&event_disable_cmd); | |
2879 | if (WARN_ON(ret < 0)) | |
2880 | unregister_ftrace_command(&event_enable_cmd); | |
2881 | return ret; | |
2882 | } | |
2883 | #else | |
2884 | static inline int register_event_cmds(void) { return 0; } | |
2885 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
2886 | ||
77248221 | 2887 | /* |
7f1d2f82 | 2888 | * The top level array has already had its trace_event_file |
77248221 | 2889 | * descriptors created in order to allow for early events to |
8434dc93 | 2890 | * be recorded. This function is called after the tracefs has been |
77248221 SR |
2891 | * initialized, and we now have to create the files associated |
2892 | * to the events. | |
2893 | */ | |
2894 | static __init void | |
2895 | __trace_early_add_event_dirs(struct trace_array *tr) | |
2896 | { | |
7f1d2f82 | 2897 | struct trace_event_file *file; |
77248221 SR |
2898 | int ret; |
2899 | ||
2900 | ||
2901 | list_for_each_entry(file, &tr->events, list) { | |
620a30e9 | 2902 | ret = event_create_dir(tr->event_dir, file); |
77248221 | 2903 | if (ret < 0) |
3448bac3 | 2904 | pr_warn("Could not create directory for event %s\n", |
687fcc4a | 2905 | trace_event_name(file->event_call)); |
77248221 SR |
2906 | } |
2907 | } | |
2908 | ||
2909 | /* | |
2910 | * For early boot up, the top trace array requires to have | |
2911 | * a list of events that can be enabled. This must be done before | |
2912 | * the filesystem is set up in order to allow events to be traced | |
2913 | * early. | |
2914 | */ | |
2915 | static __init void | |
2916 | __trace_early_add_events(struct trace_array *tr) | |
2917 | { | |
2425bcb9 | 2918 | struct trace_event_call *call; |
77248221 SR |
2919 | int ret; |
2920 | ||
2921 | list_for_each_entry(call, &ftrace_events, list) { | |
2922 | /* Early boot up should not have any modules loaded */ | |
2923 | if (WARN_ON_ONCE(call->mod)) | |
2924 | continue; | |
2925 | ||
2926 | ret = __trace_early_add_new_event(call, tr); | |
2927 | if (ret < 0) | |
3448bac3 | 2928 | pr_warn("Could not create early event %s\n", |
687fcc4a | 2929 | trace_event_name(call)); |
77248221 SR |
2930 | } |
2931 | } | |
2932 | ||
0c8916c3 SR |
2933 | /* Remove the event directory structure for a trace directory. */ |
2934 | static void | |
2935 | __trace_remove_event_dirs(struct trace_array *tr) | |
2936 | { | |
7f1d2f82 | 2937 | struct trace_event_file *file, *next; |
0c8916c3 | 2938 | |
f6a84bdc ON |
2939 | list_for_each_entry_safe(file, next, &tr->events, list) |
2940 | remove_event_file_dir(file); | |
0c8916c3 SR |
2941 | } |
2942 | ||
2425bcb9 | 2943 | static void __add_event_to_tracers(struct trace_event_call *call) |
ae63b31e SR |
2944 | { |
2945 | struct trace_array *tr; | |
2946 | ||
620a30e9 ON |
2947 | list_for_each_entry(tr, &ftrace_trace_arrays, list) |
2948 | __trace_add_new_event(call, tr); | |
ae63b31e SR |
2949 | } |
2950 | ||
2425bcb9 SRRH |
2951 | extern struct trace_event_call *__start_ftrace_events[]; |
2952 | extern struct trace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 2953 | |
020e5f85 LZ |
2954 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
2955 | ||
2956 | static __init int setup_trace_event(char *str) | |
2957 | { | |
2958 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
55034cd6 SRRH |
2959 | ring_buffer_expanded = true; |
2960 | tracing_selftest_disabled = true; | |
020e5f85 LZ |
2961 | |
2962 | return 1; | |
2963 | } | |
2964 | __setup("trace_event=", setup_trace_event); | |
2965 | ||
77248221 SR |
2966 | /* Expects to have event_mutex held when called */ |
2967 | static int | |
2968 | create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) | |
ae63b31e SR |
2969 | { |
2970 | struct dentry *d_events; | |
2971 | struct dentry *entry; | |
2972 | ||
8434dc93 | 2973 | entry = tracefs_create_file("set_event", 0644, parent, |
ae63b31e SR |
2974 | tr, &ftrace_set_event_fops); |
2975 | if (!entry) { | |
8434dc93 | 2976 | pr_warn("Could not create tracefs 'set_event' entry\n"); |
ae63b31e SR |
2977 | return -ENOMEM; |
2978 | } | |
2979 | ||
8434dc93 | 2980 | d_events = tracefs_create_dir("events", parent); |
277ba044 | 2981 | if (!d_events) { |
8434dc93 | 2982 | pr_warn("Could not create tracefs 'events' directory\n"); |
277ba044 SR |
2983 | return -ENOMEM; |
2984 | } | |
ae63b31e | 2985 | |
49090107 SRRH |
2986 | entry = tracefs_create_file("set_event_pid", 0644, parent, |
2987 | tr, &ftrace_set_event_pid_fops); | |
2988 | ||
ae63b31e SR |
2989 | /* ring buffer internal formats */ |
2990 | trace_create_file("header_page", 0444, d_events, | |
2991 | ring_buffer_print_page_header, | |
2992 | &ftrace_show_header_fops); | |
2993 | ||
2994 | trace_create_file("header_event", 0444, d_events, | |
2995 | ring_buffer_print_entry_header, | |
2996 | &ftrace_show_header_fops); | |
2997 | ||
2998 | trace_create_file("enable", 0644, d_events, | |
2999 | tr, &ftrace_tr_enable_fops); | |
3000 | ||
3001 | tr->event_dir = d_events; | |
77248221 SR |
3002 | |
3003 | return 0; | |
3004 | } | |
3005 | ||
3006 | /** | |
3007 | * event_trace_add_tracer - add a instance of a trace_array to events | |
3008 | * @parent: The parent dentry to place the files/directories for events in | |
3009 | * @tr: The trace array associated with these events | |
3010 | * | |
3011 | * When a new instance is created, it needs to set up its events | |
3012 | * directory, as well as other files associated with events. It also | |
3013 | * creates the event hierachry in the @parent/events directory. | |
3014 | * | |
3015 | * Returns 0 on success. | |
3016 | */ | |
3017 | int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) | |
3018 | { | |
3019 | int ret; | |
3020 | ||
3021 | mutex_lock(&event_mutex); | |
3022 | ||
3023 | ret = create_event_toplevel_files(parent, tr); | |
3024 | if (ret) | |
3025 | goto out_unlock; | |
3026 | ||
52f6ad6d | 3027 | down_write(&trace_event_sem); |
ae63b31e | 3028 | __trace_add_event_dirs(tr); |
52f6ad6d | 3029 | up_write(&trace_event_sem); |
277ba044 | 3030 | |
77248221 | 3031 | out_unlock: |
277ba044 | 3032 | mutex_unlock(&event_mutex); |
ae63b31e | 3033 | |
77248221 SR |
3034 | return ret; |
3035 | } | |
3036 | ||
3037 | /* | |
3038 | * The top trace array already had its file descriptors created. | |
3039 | * Now the files themselves need to be created. | |
3040 | */ | |
3041 | static __init int | |
3042 | early_event_add_tracer(struct dentry *parent, struct trace_array *tr) | |
3043 | { | |
3044 | int ret; | |
3045 | ||
3046 | mutex_lock(&event_mutex); | |
3047 | ||
3048 | ret = create_event_toplevel_files(parent, tr); | |
3049 | if (ret) | |
3050 | goto out_unlock; | |
3051 | ||
52f6ad6d | 3052 | down_write(&trace_event_sem); |
77248221 | 3053 | __trace_early_add_event_dirs(tr); |
52f6ad6d | 3054 | up_write(&trace_event_sem); |
77248221 SR |
3055 | |
3056 | out_unlock: | |
3057 | mutex_unlock(&event_mutex); | |
3058 | ||
3059 | return ret; | |
ae63b31e SR |
3060 | } |
3061 | ||
0c8916c3 SR |
3062 | int event_trace_del_tracer(struct trace_array *tr) |
3063 | { | |
0c8916c3 SR |
3064 | mutex_lock(&event_mutex); |
3065 | ||
85f2b082 TZ |
3066 | /* Disable any event triggers and associated soft-disabled events */ |
3067 | clear_event_triggers(tr); | |
3068 | ||
49090107 SRRH |
3069 | /* Clear the pid list */ |
3070 | __ftrace_clear_event_pids(tr); | |
3071 | ||
2a6c24af SRRH |
3072 | /* Disable any running events */ |
3073 | __ftrace_set_clr_event_nolock(tr, NULL, NULL, NULL, 0); | |
3074 | ||
3ccb0123 SR |
3075 | /* Access to events are within rcu_read_lock_sched() */ |
3076 | synchronize_sched(); | |
3077 | ||
52f6ad6d | 3078 | down_write(&trace_event_sem); |
0c8916c3 | 3079 | __trace_remove_event_dirs(tr); |
8434dc93 | 3080 | tracefs_remove_recursive(tr->event_dir); |
52f6ad6d | 3081 | up_write(&trace_event_sem); |
0c8916c3 SR |
3082 | |
3083 | tr->event_dir = NULL; | |
3084 | ||
3085 | mutex_unlock(&event_mutex); | |
3086 | ||
3087 | return 0; | |
3088 | } | |
3089 | ||
d1a29143 SR |
3090 | static __init int event_trace_memsetup(void) |
3091 | { | |
3092 | field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); | |
7f1d2f82 | 3093 | file_cachep = KMEM_CACHE(trace_event_file, SLAB_PANIC); |
d1a29143 SR |
3094 | return 0; |
3095 | } | |
3096 | ||
ce1039bd SRRH |
3097 | static __init void |
3098 | early_enable_events(struct trace_array *tr, bool disable_first) | |
3099 | { | |
3100 | char *buf = bootup_event_buf; | |
3101 | char *token; | |
3102 | int ret; | |
3103 | ||
3104 | while (true) { | |
3105 | token = strsep(&buf, ","); | |
3106 | ||
3107 | if (!token) | |
3108 | break; | |
ce1039bd | 3109 | |
43ed3843 SRRH |
3110 | if (*token) { |
3111 | /* Restarting syscalls requires that we stop them first */ | |
3112 | if (disable_first) | |
3113 | ftrace_set_clr_event(tr, token, 0); | |
ce1039bd | 3114 | |
43ed3843 SRRH |
3115 | ret = ftrace_set_clr_event(tr, token, 1); |
3116 | if (ret) | |
3117 | pr_warn("Failed to enable trace event: %s\n", token); | |
3118 | } | |
ce1039bd SRRH |
3119 | |
3120 | /* Put back the comma to allow this to be called again */ | |
3121 | if (buf) | |
3122 | *(buf - 1) = ','; | |
3123 | } | |
3124 | } | |
3125 | ||
8781915a EG |
3126 | static __init int event_trace_enable(void) |
3127 | { | |
ae63b31e | 3128 | struct trace_array *tr = top_trace_array(); |
2425bcb9 | 3129 | struct trace_event_call **iter, *call; |
8781915a EG |
3130 | int ret; |
3131 | ||
dc81e5e3 YY |
3132 | if (!tr) |
3133 | return -ENODEV; | |
3134 | ||
8781915a EG |
3135 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { |
3136 | ||
3137 | call = *iter; | |
3138 | ret = event_init(call); | |
3139 | if (!ret) | |
3140 | list_add(&call->list, &ftrace_events); | |
3141 | } | |
3142 | ||
77248221 SR |
3143 | /* |
3144 | * We need the top trace array to have a working set of trace | |
3145 | * points at early init, before the debug files and directories | |
3146 | * are created. Create the file entries now, and attach them | |
3147 | * to the actual file dentries later. | |
3148 | */ | |
3149 | __trace_early_add_events(tr); | |
3150 | ||
ce1039bd | 3151 | early_enable_events(tr, false); |
81698831 SR |
3152 | |
3153 | trace_printk_start_comm(); | |
3154 | ||
3cd715de SRRH |
3155 | register_event_cmds(); |
3156 | ||
85f2b082 TZ |
3157 | register_trigger_cmds(); |
3158 | ||
8781915a EG |
3159 | return 0; |
3160 | } | |
3161 | ||
ce1039bd SRRH |
3162 | /* |
3163 | * event_trace_enable() is called from trace_event_init() first to | |
3164 | * initialize events and perhaps start any events that are on the | |
3165 | * command line. Unfortunately, there are some events that will not | |
3166 | * start this early, like the system call tracepoints that need | |
3167 | * to set the TIF_SYSCALL_TRACEPOINT flag of pid 1. But event_trace_enable() | |
3168 | * is called before pid 1 starts, and this flag is never set, making | |
3169 | * the syscall tracepoint never get reached, but the event is enabled | |
3170 | * regardless (and not doing anything). | |
3171 | */ | |
3172 | static __init int event_trace_enable_again(void) | |
3173 | { | |
3174 | struct trace_array *tr; | |
3175 | ||
3176 | tr = top_trace_array(); | |
3177 | if (!tr) | |
3178 | return -ENODEV; | |
3179 | ||
3180 | early_enable_events(tr, true); | |
3181 | ||
3182 | return 0; | |
3183 | } | |
3184 | ||
3185 | early_initcall(event_trace_enable_again); | |
3186 | ||
b77e38aa SR |
3187 | static __init int event_trace_init(void) |
3188 | { | |
ae63b31e | 3189 | struct trace_array *tr; |
b77e38aa SR |
3190 | struct dentry *d_tracer; |
3191 | struct dentry *entry; | |
6d723736 | 3192 | int ret; |
b77e38aa | 3193 | |
ae63b31e | 3194 | tr = top_trace_array(); |
dc81e5e3 YY |
3195 | if (!tr) |
3196 | return -ENODEV; | |
ae63b31e | 3197 | |
b77e38aa | 3198 | d_tracer = tracing_init_dentry(); |
14a5ae40 | 3199 | if (IS_ERR(d_tracer)) |
b77e38aa SR |
3200 | return 0; |
3201 | ||
8434dc93 | 3202 | entry = tracefs_create_file("available_events", 0444, d_tracer, |
ae63b31e | 3203 | tr, &ftrace_avail_fops); |
2314c4ae | 3204 | if (!entry) |
8434dc93 | 3205 | pr_warn("Could not create tracefs 'available_events' entry\n"); |
2314c4ae | 3206 | |
9f616680 DW |
3207 | if (trace_define_generic_fields()) |
3208 | pr_warn("tracing: Failed to allocated generic fields"); | |
3209 | ||
8728fe50 | 3210 | if (trace_define_common_fields()) |
3448bac3 | 3211 | pr_warn("tracing: Failed to allocate common fields"); |
8728fe50 | 3212 | |
77248221 | 3213 | ret = early_event_add_tracer(d_tracer, tr); |
ae63b31e SR |
3214 | if (ret) |
3215 | return ret; | |
020e5f85 | 3216 | |
836d481e | 3217 | #ifdef CONFIG_MODULES |
6d723736 | 3218 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 3219 | if (ret) |
3448bac3 | 3220 | pr_warn("Failed to register trace events module notifier\n"); |
836d481e | 3221 | #endif |
b77e38aa SR |
3222 | return 0; |
3223 | } | |
5f893b26 SRRH |
3224 | |
3225 | void __init trace_event_init(void) | |
3226 | { | |
3227 | event_trace_memsetup(); | |
3228 | init_ftrace_syscalls(); | |
3229 | event_trace_enable(); | |
3230 | } | |
3231 | ||
b77e38aa | 3232 | fs_initcall(event_trace_init); |
e6187007 SR |
3233 | |
3234 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
3235 | ||
3236 | static DEFINE_SPINLOCK(test_spinlock); | |
3237 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
3238 | static DEFINE_MUTEX(test_mutex); | |
3239 | ||
3240 | static __init void test_work(struct work_struct *dummy) | |
3241 | { | |
3242 | spin_lock(&test_spinlock); | |
3243 | spin_lock_irq(&test_spinlock_irq); | |
3244 | udelay(1); | |
3245 | spin_unlock_irq(&test_spinlock_irq); | |
3246 | spin_unlock(&test_spinlock); | |
3247 | ||
3248 | mutex_lock(&test_mutex); | |
3249 | msleep(1); | |
3250 | mutex_unlock(&test_mutex); | |
3251 | } | |
3252 | ||
3253 | static __init int event_test_thread(void *unused) | |
3254 | { | |
3255 | void *test_malloc; | |
3256 | ||
3257 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
3258 | if (!test_malloc) | |
3259 | pr_info("failed to kmalloc\n"); | |
3260 | ||
3261 | schedule_on_each_cpu(test_work); | |
3262 | ||
3263 | kfree(test_malloc); | |
3264 | ||
3265 | set_current_state(TASK_INTERRUPTIBLE); | |
fe0e01c7 | 3266 | while (!kthread_should_stop()) { |
e6187007 | 3267 | schedule(); |
fe0e01c7 PZ |
3268 | set_current_state(TASK_INTERRUPTIBLE); |
3269 | } | |
3270 | __set_current_state(TASK_RUNNING); | |
e6187007 SR |
3271 | |
3272 | return 0; | |
3273 | } | |
3274 | ||
3275 | /* | |
3276 | * Do various things that may trigger events. | |
3277 | */ | |
3278 | static __init void event_test_stuff(void) | |
3279 | { | |
3280 | struct task_struct *test_thread; | |
3281 | ||
3282 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
3283 | msleep(1); | |
3284 | kthread_stop(test_thread); | |
3285 | } | |
3286 | ||
3287 | /* | |
3288 | * For every trace event defined, we will test each trace point separately, | |
3289 | * and then by groups, and finally all trace points. | |
3290 | */ | |
9ea21c1e | 3291 | static __init void event_trace_self_tests(void) |
e6187007 | 3292 | { |
7967b3e0 | 3293 | struct trace_subsystem_dir *dir; |
7f1d2f82 | 3294 | struct trace_event_file *file; |
2425bcb9 | 3295 | struct trace_event_call *call; |
e6187007 | 3296 | struct event_subsystem *system; |
ae63b31e | 3297 | struct trace_array *tr; |
e6187007 SR |
3298 | int ret; |
3299 | ||
ae63b31e | 3300 | tr = top_trace_array(); |
dc81e5e3 YY |
3301 | if (!tr) |
3302 | return; | |
ae63b31e | 3303 | |
e6187007 SR |
3304 | pr_info("Running tests on trace events:\n"); |
3305 | ||
ae63b31e SR |
3306 | list_for_each_entry(file, &tr->events, list) { |
3307 | ||
3308 | call = file->event_call; | |
e6187007 | 3309 | |
2239291a SR |
3310 | /* Only test those that have a probe */ |
3311 | if (!call->class || !call->class->probe) | |
e6187007 SR |
3312 | continue; |
3313 | ||
1f5a6b45 SR |
3314 | /* |
3315 | * Testing syscall events here is pretty useless, but | |
3316 | * we still do it if configured. But this is time consuming. | |
3317 | * What we really need is a user thread to perform the | |
3318 | * syscalls as we test. | |
3319 | */ | |
3320 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
3321 | if (call->class->system && |
3322 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
3323 | continue; |
3324 | #endif | |
3325 | ||
687fcc4a | 3326 | pr_info("Testing event %s: ", trace_event_name(call)); |
e6187007 SR |
3327 | |
3328 | /* | |
3329 | * If an event is already enabled, someone is using | |
3330 | * it and the self test should not be on. | |
3331 | */ | |
5d6ad960 | 3332 | if (file->flags & EVENT_FILE_FL_ENABLED) { |
3448bac3 | 3333 | pr_warn("Enabled event during self test!\n"); |
e6187007 SR |
3334 | WARN_ON_ONCE(1); |
3335 | continue; | |
3336 | } | |
3337 | ||
ae63b31e | 3338 | ftrace_event_enable_disable(file, 1); |
e6187007 | 3339 | event_test_stuff(); |
ae63b31e | 3340 | ftrace_event_enable_disable(file, 0); |
e6187007 SR |
3341 | |
3342 | pr_cont("OK\n"); | |
3343 | } | |
3344 | ||
3345 | /* Now test at the sub system level */ | |
3346 | ||
3347 | pr_info("Running tests on trace event systems:\n"); | |
3348 | ||
ae63b31e SR |
3349 | list_for_each_entry(dir, &tr->systems, list) { |
3350 | ||
3351 | system = dir->subsystem; | |
e6187007 SR |
3352 | |
3353 | /* the ftrace system is special, skip it */ | |
3354 | if (strcmp(system->name, "ftrace") == 0) | |
3355 | continue; | |
3356 | ||
3357 | pr_info("Testing event system %s: ", system->name); | |
3358 | ||
ae63b31e | 3359 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
e6187007 | 3360 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
3361 | pr_warn("error enabling system %s\n", |
3362 | system->name); | |
e6187007 SR |
3363 | continue; |
3364 | } | |
3365 | ||
3366 | event_test_stuff(); | |
3367 | ||
ae63b31e | 3368 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
76bab1b7 | 3369 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
3370 | pr_warn("error disabling system %s\n", |
3371 | system->name); | |
76bab1b7 YL |
3372 | continue; |
3373 | } | |
e6187007 SR |
3374 | |
3375 | pr_cont("OK\n"); | |
3376 | } | |
3377 | ||
3378 | /* Test with all events enabled */ | |
3379 | ||
3380 | pr_info("Running tests on all trace events:\n"); | |
3381 | pr_info("Testing all events: "); | |
3382 | ||
ae63b31e | 3383 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
e6187007 | 3384 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 3385 | pr_warn("error enabling all events\n"); |
9ea21c1e | 3386 | return; |
e6187007 SR |
3387 | } |
3388 | ||
3389 | event_test_stuff(); | |
3390 | ||
3391 | /* reset sysname */ | |
ae63b31e | 3392 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
e6187007 | 3393 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 3394 | pr_warn("error disabling all events\n"); |
9ea21c1e | 3395 | return; |
e6187007 SR |
3396 | } |
3397 | ||
3398 | pr_cont("OK\n"); | |
9ea21c1e SR |
3399 | } |
3400 | ||
3401 | #ifdef CONFIG_FUNCTION_TRACER | |
3402 | ||
245b2e70 | 3403 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e | 3404 | |
9b9db275 | 3405 | static struct trace_event_file event_trace_file __initdata; |
b7f0c959 SRRH |
3406 | |
3407 | static void __init | |
2f5f6ad9 | 3408 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 3409 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
9ea21c1e SR |
3410 | { |
3411 | struct ring_buffer_event *event; | |
e77405ad | 3412 | struct ring_buffer *buffer; |
9ea21c1e SR |
3413 | struct ftrace_entry *entry; |
3414 | unsigned long flags; | |
3415 | long disabled; | |
9ea21c1e SR |
3416 | int cpu; |
3417 | int pc; | |
3418 | ||
3419 | pc = preempt_count(); | |
5168ae50 | 3420 | preempt_disable_notrace(); |
9ea21c1e | 3421 | cpu = raw_smp_processor_id(); |
245b2e70 | 3422 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
3423 | |
3424 | if (disabled != 1) | |
3425 | goto out; | |
3426 | ||
3427 | local_save_flags(flags); | |
3428 | ||
9b9db275 SRRH |
3429 | event = trace_event_buffer_lock_reserve(&buffer, &event_trace_file, |
3430 | TRACE_FN, sizeof(*entry), | |
3431 | flags, pc); | |
9ea21c1e SR |
3432 | if (!event) |
3433 | goto out; | |
3434 | entry = ring_buffer_event_data(event); | |
3435 | entry->ip = ip; | |
3436 | entry->parent_ip = parent_ip; | |
3437 | ||
9b9db275 SRRH |
3438 | event_trigger_unlock_commit(&event_trace_file, buffer, event, |
3439 | entry, flags, pc); | |
9ea21c1e | 3440 | out: |
245b2e70 | 3441 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 3442 | preempt_enable_notrace(); |
9ea21c1e SR |
3443 | } |
3444 | ||
3445 | static struct ftrace_ops trace_ops __initdata = | |
3446 | { | |
3447 | .func = function_test_events_call, | |
4740974a | 3448 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
9ea21c1e SR |
3449 | }; |
3450 | ||
3451 | static __init void event_trace_self_test_with_function(void) | |
3452 | { | |
17bb615a | 3453 | int ret; |
9b9db275 SRRH |
3454 | |
3455 | event_trace_file.tr = top_trace_array(); | |
3456 | if (WARN_ON(!event_trace_file.tr)) | |
2d34f489 | 3457 | return; |
9b9db275 | 3458 | |
17bb615a SR |
3459 | ret = register_ftrace_function(&trace_ops); |
3460 | if (WARN_ON(ret < 0)) { | |
3461 | pr_info("Failed to enable function tracer for event tests\n"); | |
3462 | return; | |
3463 | } | |
9ea21c1e SR |
3464 | pr_info("Running tests again, along with the function tracer\n"); |
3465 | event_trace_self_tests(); | |
3466 | unregister_ftrace_function(&trace_ops); | |
3467 | } | |
3468 | #else | |
3469 | static __init void event_trace_self_test_with_function(void) | |
3470 | { | |
3471 | } | |
3472 | #endif | |
3473 | ||
3474 | static __init int event_trace_self_tests_init(void) | |
3475 | { | |
020e5f85 LZ |
3476 | if (!tracing_selftest_disabled) { |
3477 | event_trace_self_tests(); | |
3478 | event_trace_self_test_with_function(); | |
3479 | } | |
e6187007 SR |
3480 | |
3481 | return 0; | |
3482 | } | |
3483 | ||
28d20e2d | 3484 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
3485 | |
3486 | #endif |