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bcea3f96 | 1 | // SPDX-License-Identifier: GPL-2.0 |
b77e38aa SR |
2 | /* |
3 | * event tracer | |
4 | * | |
5 | * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> | |
6 | * | |
981d081e SR |
7 | * - Added format output of fields of the trace point. |
8 | * This was based off of work by Tom Zanussi <tzanussi@gmail.com>. | |
9 | * | |
b77e38aa SR |
10 | */ |
11 | ||
3448bac3 FF |
12 | #define pr_fmt(fmt) fmt |
13 | ||
e6187007 | 14 | #include <linux/workqueue.h> |
17911ff3 | 15 | #include <linux/security.h> |
e6187007 SR |
16 | #include <linux/spinlock.h> |
17 | #include <linux/kthread.h> | |
8434dc93 | 18 | #include <linux/tracefs.h> |
b77e38aa SR |
19 | #include <linux/uaccess.h> |
20 | #include <linux/module.h> | |
21 | #include <linux/ctype.h> | |
49090107 | 22 | #include <linux/sort.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
e6187007 | 24 | #include <linux/delay.h> |
b77e38aa | 25 | |
3fdaf80f | 26 | #include <trace/events/sched.h> |
04ae87a5 | 27 | #include <trace/syscall.h> |
3fdaf80f | 28 | |
020e5f85 LZ |
29 | #include <asm/setup.h> |
30 | ||
91729ef9 | 31 | #include "trace_output.h" |
b77e38aa | 32 | |
4e5292ea | 33 | #undef TRACE_SYSTEM |
b628b3e6 SR |
34 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
35 | ||
20c8928a | 36 | DEFINE_MUTEX(event_mutex); |
11a241a3 | 37 | |
a59fd602 | 38 | LIST_HEAD(ftrace_events); |
9f616680 | 39 | static LIST_HEAD(ftrace_generic_fields); |
b3a8c6fd | 40 | static LIST_HEAD(ftrace_common_fields); |
a838deab | 41 | static bool eventdir_initialized; |
a59fd602 | 42 | |
d1a29143 SR |
43 | #define GFP_TRACE (GFP_KERNEL | __GFP_ZERO) |
44 | ||
45 | static struct kmem_cache *field_cachep; | |
46 | static struct kmem_cache *file_cachep; | |
47 | ||
6e94a780 SR |
48 | static inline int system_refcount(struct event_subsystem *system) |
49 | { | |
79ac6ef5 | 50 | return system->ref_count; |
6e94a780 SR |
51 | } |
52 | ||
53 | static int system_refcount_inc(struct event_subsystem *system) | |
54 | { | |
79ac6ef5 | 55 | return system->ref_count++; |
6e94a780 SR |
56 | } |
57 | ||
58 | static int system_refcount_dec(struct event_subsystem *system) | |
59 | { | |
79ac6ef5 | 60 | return --system->ref_count; |
6e94a780 SR |
61 | } |
62 | ||
ae63b31e SR |
63 | /* Double loops, do not use break, only goto's work */ |
64 | #define do_for_each_event_file(tr, file) \ | |
65 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
66 | list_for_each_entry(file, &tr->events, list) | |
67 | ||
68 | #define do_for_each_event_file_safe(tr, file) \ | |
69 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
7f1d2f82 | 70 | struct trace_event_file *___n; \ |
ae63b31e SR |
71 | list_for_each_entry_safe(file, ___n, &tr->events, list) |
72 | ||
73 | #define while_for_each_event_file() \ | |
74 | } | |
75 | ||
b3a8c6fd J |
76 | static struct ftrace_event_field * |
77 | __find_event_field(struct list_head *head, char *name) | |
78 | { | |
79 | struct ftrace_event_field *field; | |
80 | ||
81 | list_for_each_entry(field, head, link) { | |
82 | if (!strcmp(field->name, name)) | |
83 | return field; | |
84 | } | |
85 | ||
86 | return NULL; | |
87 | } | |
88 | ||
89 | struct ftrace_event_field * | |
2425bcb9 | 90 | trace_find_event_field(struct trace_event_call *call, char *name) |
b3a8c6fd J |
91 | { |
92 | struct ftrace_event_field *field; | |
93 | struct list_head *head; | |
94 | ||
e57cbaf0 SRRH |
95 | head = trace_get_fields(call); |
96 | field = __find_event_field(head, name); | |
9f616680 DW |
97 | if (field) |
98 | return field; | |
99 | ||
e57cbaf0 | 100 | field = __find_event_field(&ftrace_generic_fields, name); |
b3a8c6fd J |
101 | if (field) |
102 | return field; | |
103 | ||
e57cbaf0 | 104 | return __find_event_field(&ftrace_common_fields, name); |
b3a8c6fd J |
105 | } |
106 | ||
8728fe50 LZ |
107 | static int __trace_define_field(struct list_head *head, const char *type, |
108 | const char *name, int offset, int size, | |
109 | int is_signed, int filter_type) | |
cf027f64 TZ |
110 | { |
111 | struct ftrace_event_field *field; | |
112 | ||
d1a29143 | 113 | field = kmem_cache_alloc(field_cachep, GFP_TRACE); |
cf027f64 | 114 | if (!field) |
aaf6ac0f | 115 | return -ENOMEM; |
fe9f57f2 | 116 | |
92edca07 SR |
117 | field->name = name; |
118 | field->type = type; | |
fe9f57f2 | 119 | |
43b51ead LZ |
120 | if (filter_type == FILTER_OTHER) |
121 | field->filter_type = filter_assign_type(type); | |
122 | else | |
123 | field->filter_type = filter_type; | |
124 | ||
cf027f64 TZ |
125 | field->offset = offset; |
126 | field->size = size; | |
a118e4d1 | 127 | field->is_signed = is_signed; |
aa38e9fc | 128 | |
2e33af02 | 129 | list_add(&field->link, head); |
cf027f64 TZ |
130 | |
131 | return 0; | |
cf027f64 | 132 | } |
8728fe50 | 133 | |
2425bcb9 | 134 | int trace_define_field(struct trace_event_call *call, const char *type, |
8728fe50 LZ |
135 | const char *name, int offset, int size, int is_signed, |
136 | int filter_type) | |
137 | { | |
138 | struct list_head *head; | |
139 | ||
140 | if (WARN_ON(!call->class)) | |
141 | return 0; | |
142 | ||
143 | head = trace_get_fields(call); | |
144 | return __trace_define_field(head, type, name, offset, size, | |
145 | is_signed, filter_type); | |
146 | } | |
17c873ec | 147 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 148 | |
9f616680 DW |
149 | #define __generic_field(type, item, filter_type) \ |
150 | ret = __trace_define_field(&ftrace_generic_fields, #type, \ | |
151 | #item, 0, 0, is_signed_type(type), \ | |
152 | filter_type); \ | |
153 | if (ret) \ | |
154 | return ret; | |
155 | ||
e647d6b3 | 156 | #define __common_field(type, item) \ |
8728fe50 LZ |
157 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
158 | "common_" #item, \ | |
159 | offsetof(typeof(ent), item), \ | |
160 | sizeof(ent.item), \ | |
161 | is_signed_type(type), FILTER_OTHER); \ | |
e647d6b3 LZ |
162 | if (ret) \ |
163 | return ret; | |
164 | ||
9f616680 DW |
165 | static int trace_define_generic_fields(void) |
166 | { | |
167 | int ret; | |
168 | ||
e57cbaf0 SRRH |
169 | __generic_field(int, CPU, FILTER_CPU); |
170 | __generic_field(int, cpu, FILTER_CPU); | |
171 | __generic_field(char *, COMM, FILTER_COMM); | |
172 | __generic_field(char *, comm, FILTER_COMM); | |
9f616680 DW |
173 | |
174 | return ret; | |
175 | } | |
176 | ||
8728fe50 | 177 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
178 | { |
179 | int ret; | |
180 | struct trace_entry ent; | |
181 | ||
182 | __common_field(unsigned short, type); | |
183 | __common_field(unsigned char, flags); | |
184 | __common_field(unsigned char, preempt_count); | |
185 | __common_field(int, pid); | |
e647d6b3 LZ |
186 | |
187 | return ret; | |
188 | } | |
189 | ||
2425bcb9 | 190 | static void trace_destroy_fields(struct trace_event_call *call) |
2df75e41 LZ |
191 | { |
192 | struct ftrace_event_field *field, *next; | |
2e33af02 | 193 | struct list_head *head; |
2df75e41 | 194 | |
2e33af02 SR |
195 | head = trace_get_fields(call); |
196 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 | 197 | list_del(&field->link); |
d1a29143 | 198 | kmem_cache_free(field_cachep, field); |
2df75e41 LZ |
199 | } |
200 | } | |
201 | ||
32bbe007 AS |
202 | /* |
203 | * run-time version of trace_event_get_offsets_<call>() that returns the last | |
204 | * accessible offset of trace fields excluding __dynamic_array bytes | |
205 | */ | |
206 | int trace_event_get_offsets(struct trace_event_call *call) | |
207 | { | |
208 | struct ftrace_event_field *tail; | |
209 | struct list_head *head; | |
210 | ||
211 | head = trace_get_fields(call); | |
212 | /* | |
213 | * head->next points to the last field with the largest offset, | |
214 | * since it was added last by trace_define_field() | |
215 | */ | |
216 | tail = list_first_entry(head, struct ftrace_event_field, link); | |
217 | return tail->offset + tail->size; | |
218 | } | |
219 | ||
2425bcb9 | 220 | int trace_event_raw_init(struct trace_event_call *call) |
87d9b4e1 LZ |
221 | { |
222 | int id; | |
223 | ||
9023c930 | 224 | id = register_trace_event(&call->event); |
87d9b4e1 LZ |
225 | if (!id) |
226 | return -ENODEV; | |
87d9b4e1 LZ |
227 | |
228 | return 0; | |
229 | } | |
230 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
231 | ||
3fdaf80f SRRH |
232 | bool trace_event_ignore_this_pid(struct trace_event_file *trace_file) |
233 | { | |
234 | struct trace_array *tr = trace_file->tr; | |
235 | struct trace_array_cpu *data; | |
27683626 | 236 | struct trace_pid_list *no_pid_list; |
3fdaf80f SRRH |
237 | struct trace_pid_list *pid_list; |
238 | ||
da25a672 | 239 | pid_list = rcu_dereference_raw(tr->filtered_pids); |
27683626 SRV |
240 | no_pid_list = rcu_dereference_raw(tr->filtered_no_pids); |
241 | ||
242 | if (!pid_list && !no_pid_list) | |
3fdaf80f SRRH |
243 | return false; |
244 | ||
1c5eb448 | 245 | data = this_cpu_ptr(tr->array_buffer.data); |
3fdaf80f SRRH |
246 | |
247 | return data->ignore_pid; | |
248 | } | |
249 | EXPORT_SYMBOL_GPL(trace_event_ignore_this_pid); | |
250 | ||
3f795dcf SRRH |
251 | void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer, |
252 | struct trace_event_file *trace_file, | |
253 | unsigned long len) | |
3fd40d1e | 254 | { |
2425bcb9 | 255 | struct trace_event_call *event_call = trace_file->event_call; |
3fd40d1e | 256 | |
3fdaf80f SRRH |
257 | if ((trace_file->flags & EVENT_FILE_FL_PID_FILTER) && |
258 | trace_event_ignore_this_pid(trace_file)) | |
259 | return NULL; | |
260 | ||
e947841c | 261 | /* |
30c93704 | 262 | * If CONFIG_PREEMPTION is enabled, then the tracepoint itself disables |
e947841c SRRH |
263 | * preemption (adding one to the preempt_count). Since we are |
264 | * interested in the preempt_count at the time the tracepoint was | |
265 | * hit, we need to subtract one to offset the increment. | |
266 | */ | |
36590c50 | 267 | fbuffer->trace_ctx = tracing_gen_ctx_dec(); |
7f1d2f82 | 268 | fbuffer->trace_file = trace_file; |
3fd40d1e SR |
269 | |
270 | fbuffer->event = | |
7f1d2f82 | 271 | trace_event_buffer_lock_reserve(&fbuffer->buffer, trace_file, |
3fd40d1e | 272 | event_call->event.type, len, |
36590c50 | 273 | fbuffer->trace_ctx); |
3fd40d1e SR |
274 | if (!fbuffer->event) |
275 | return NULL; | |
276 | ||
8cfcf155 | 277 | fbuffer->regs = NULL; |
3fd40d1e SR |
278 | fbuffer->entry = ring_buffer_event_data(fbuffer->event); |
279 | return fbuffer->entry; | |
280 | } | |
3f795dcf | 281 | EXPORT_SYMBOL_GPL(trace_event_buffer_reserve); |
3fd40d1e | 282 | |
2425bcb9 | 283 | int trace_event_reg(struct trace_event_call *call, |
9023c930 | 284 | enum trace_reg type, void *data) |
a1d0ce82 | 285 | { |
7f1d2f82 | 286 | struct trace_event_file *file = data; |
ae63b31e | 287 | |
de7b2973 | 288 | WARN_ON(!(call->flags & TRACE_EVENT_FL_TRACEPOINT)); |
a1d0ce82 SR |
289 | switch (type) { |
290 | case TRACE_REG_REGISTER: | |
de7b2973 | 291 | return tracepoint_probe_register(call->tp, |
a1d0ce82 | 292 | call->class->probe, |
ae63b31e | 293 | file); |
a1d0ce82 | 294 | case TRACE_REG_UNREGISTER: |
de7b2973 | 295 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 | 296 | call->class->probe, |
ae63b31e | 297 | file); |
a1d0ce82 SR |
298 | return 0; |
299 | ||
300 | #ifdef CONFIG_PERF_EVENTS | |
301 | case TRACE_REG_PERF_REGISTER: | |
de7b2973 | 302 | return tracepoint_probe_register(call->tp, |
a1d0ce82 SR |
303 | call->class->perf_probe, |
304 | call); | |
305 | case TRACE_REG_PERF_UNREGISTER: | |
de7b2973 | 306 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 SR |
307 | call->class->perf_probe, |
308 | call); | |
309 | return 0; | |
ceec0b6f JO |
310 | case TRACE_REG_PERF_OPEN: |
311 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
312 | case TRACE_REG_PERF_ADD: |
313 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 314 | return 0; |
a1d0ce82 SR |
315 | #endif |
316 | } | |
317 | return 0; | |
318 | } | |
9023c930 | 319 | EXPORT_SYMBOL_GPL(trace_event_reg); |
a1d0ce82 | 320 | |
e870e9a1 LZ |
321 | void trace_event_enable_cmd_record(bool enable) |
322 | { | |
7f1d2f82 | 323 | struct trace_event_file *file; |
ae63b31e | 324 | struct trace_array *tr; |
e870e9a1 | 325 | |
3a53acf1 PS |
326 | lockdep_assert_held(&event_mutex); |
327 | ||
ae63b31e SR |
328 | do_for_each_event_file(tr, file) { |
329 | ||
5d6ad960 | 330 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) |
e870e9a1 LZ |
331 | continue; |
332 | ||
333 | if (enable) { | |
334 | tracing_start_cmdline_record(); | |
5d6ad960 | 335 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 LZ |
336 | } else { |
337 | tracing_stop_cmdline_record(); | |
5d6ad960 | 338 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 339 | } |
ae63b31e | 340 | } while_for_each_event_file(); |
e870e9a1 LZ |
341 | } |
342 | ||
d914ba37 JF |
343 | void trace_event_enable_tgid_record(bool enable) |
344 | { | |
345 | struct trace_event_file *file; | |
346 | struct trace_array *tr; | |
347 | ||
3a53acf1 PS |
348 | lockdep_assert_held(&event_mutex); |
349 | ||
d914ba37 JF |
350 | do_for_each_event_file(tr, file) { |
351 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) | |
352 | continue; | |
353 | ||
354 | if (enable) { | |
355 | tracing_start_tgid_record(); | |
356 | set_bit(EVENT_FILE_FL_RECORDED_TGID_BIT, &file->flags); | |
357 | } else { | |
358 | tracing_stop_tgid_record(); | |
359 | clear_bit(EVENT_FILE_FL_RECORDED_TGID_BIT, | |
360 | &file->flags); | |
361 | } | |
362 | } while_for_each_event_file(); | |
d914ba37 JF |
363 | } |
364 | ||
7f1d2f82 | 365 | static int __ftrace_event_enable_disable(struct trace_event_file *file, |
417944c4 | 366 | int enable, int soft_disable) |
fd994989 | 367 | { |
2425bcb9 | 368 | struct trace_event_call *call = file->event_call; |
983f938a | 369 | struct trace_array *tr = file->tr; |
0fc1b09f | 370 | unsigned long file_flags = file->flags; |
3b8e4273 | 371 | int ret = 0; |
417944c4 | 372 | int disable; |
3b8e4273 | 373 | |
fd994989 SR |
374 | switch (enable) { |
375 | case 0: | |
417944c4 | 376 | /* |
1cf4c073 MH |
377 | * When soft_disable is set and enable is cleared, the sm_ref |
378 | * reference counter is decremented. If it reaches 0, we want | |
417944c4 SRRH |
379 | * to clear the SOFT_DISABLED flag but leave the event in the |
380 | * state that it was. That is, if the event was enabled and | |
381 | * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED | |
382 | * is set we do not want the event to be enabled before we | |
383 | * clear the bit. | |
384 | * | |
385 | * When soft_disable is not set but the SOFT_MODE flag is, | |
386 | * we do nothing. Do not disable the tracepoint, otherwise | |
387 | * "soft enable"s (clearing the SOFT_DISABLED bit) wont work. | |
388 | */ | |
389 | if (soft_disable) { | |
1cf4c073 MH |
390 | if (atomic_dec_return(&file->sm_ref) > 0) |
391 | break; | |
5d6ad960 SRRH |
392 | disable = file->flags & EVENT_FILE_FL_SOFT_DISABLED; |
393 | clear_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); | |
417944c4 | 394 | } else |
5d6ad960 | 395 | disable = !(file->flags & EVENT_FILE_FL_SOFT_MODE); |
417944c4 | 396 | |
5d6ad960 SRRH |
397 | if (disable && (file->flags & EVENT_FILE_FL_ENABLED)) { |
398 | clear_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); | |
399 | if (file->flags & EVENT_FILE_FL_RECORDED_CMD) { | |
e870e9a1 | 400 | tracing_stop_cmdline_record(); |
5d6ad960 | 401 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 402 | } |
d914ba37 JF |
403 | |
404 | if (file->flags & EVENT_FILE_FL_RECORDED_TGID) { | |
405 | tracing_stop_tgid_record(); | |
7685ab6c | 406 | clear_bit(EVENT_FILE_FL_RECORDED_TGID_BIT, &file->flags); |
d914ba37 JF |
407 | } |
408 | ||
ae63b31e | 409 | call->class->reg(call, TRACE_REG_UNREGISTER, file); |
fd994989 | 410 | } |
3baa5e4c | 411 | /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT, else clear it */ |
5d6ad960 SRRH |
412 | if (file->flags & EVENT_FILE_FL_SOFT_MODE) |
413 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); | |
3baa5e4c | 414 | else |
5d6ad960 | 415 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
fd994989 SR |
416 | break; |
417 | case 1: | |
417944c4 SRRH |
418 | /* |
419 | * When soft_disable is set and enable is set, we want to | |
420 | * register the tracepoint for the event, but leave the event | |
421 | * as is. That means, if the event was already enabled, we do | |
422 | * nothing (but set SOFT_MODE). If the event is disabled, we | |
423 | * set SOFT_DISABLED before enabling the event tracepoint, so | |
424 | * it still seems to be disabled. | |
425 | */ | |
426 | if (!soft_disable) | |
5d6ad960 | 427 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
1cf4c073 MH |
428 | else { |
429 | if (atomic_inc_return(&file->sm_ref) > 1) | |
430 | break; | |
5d6ad960 | 431 | set_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); |
1cf4c073 | 432 | } |
417944c4 | 433 | |
5d6ad960 | 434 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) { |
d914ba37 | 435 | bool cmd = false, tgid = false; |
417944c4 SRRH |
436 | |
437 | /* Keep the event disabled, when going to SOFT_MODE. */ | |
438 | if (soft_disable) | |
5d6ad960 | 439 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
417944c4 | 440 | |
983f938a | 441 | if (tr->trace_flags & TRACE_ITER_RECORD_CMD) { |
d914ba37 | 442 | cmd = true; |
e870e9a1 | 443 | tracing_start_cmdline_record(); |
5d6ad960 | 444 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 445 | } |
d914ba37 JF |
446 | |
447 | if (tr->trace_flags & TRACE_ITER_RECORD_TGID) { | |
448 | tgid = true; | |
449 | tracing_start_tgid_record(); | |
450 | set_bit(EVENT_FILE_FL_RECORDED_TGID_BIT, &file->flags); | |
451 | } | |
452 | ||
ae63b31e | 453 | ret = call->class->reg(call, TRACE_REG_REGISTER, file); |
3b8e4273 | 454 | if (ret) { |
d914ba37 JF |
455 | if (cmd) |
456 | tracing_stop_cmdline_record(); | |
457 | if (tgid) | |
458 | tracing_stop_tgid_record(); | |
3b8e4273 | 459 | pr_info("event trace: Could not enable event " |
687fcc4a | 460 | "%s\n", trace_event_name(call)); |
3b8e4273 LZ |
461 | break; |
462 | } | |
5d6ad960 | 463 | set_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); |
575380da SRRH |
464 | |
465 | /* WAS_ENABLED gets set but never cleared. */ | |
065e63f9 | 466 | set_bit(EVENT_FILE_FL_WAS_ENABLED_BIT, &file->flags); |
fd994989 | 467 | } |
fd994989 SR |
468 | break; |
469 | } | |
3b8e4273 | 470 | |
0fc1b09f SRRH |
471 | /* Enable or disable use of trace_buffered_event */ |
472 | if ((file_flags & EVENT_FILE_FL_SOFT_DISABLED) != | |
473 | (file->flags & EVENT_FILE_FL_SOFT_DISABLED)) { | |
474 | if (file->flags & EVENT_FILE_FL_SOFT_DISABLED) | |
475 | trace_buffered_event_enable(); | |
476 | else | |
477 | trace_buffered_event_disable(); | |
478 | } | |
479 | ||
3b8e4273 | 480 | return ret; |
fd994989 SR |
481 | } |
482 | ||
7f1d2f82 | 483 | int trace_event_enable_disable(struct trace_event_file *file, |
85f2b082 TZ |
484 | int enable, int soft_disable) |
485 | { | |
486 | return __ftrace_event_enable_disable(file, enable, soft_disable); | |
487 | } | |
488 | ||
7f1d2f82 | 489 | static int ftrace_event_enable_disable(struct trace_event_file *file, |
417944c4 SRRH |
490 | int enable) |
491 | { | |
492 | return __ftrace_event_enable_disable(file, enable, 0); | |
493 | } | |
494 | ||
ae63b31e | 495 | static void ftrace_clear_events(struct trace_array *tr) |
0e907c99 | 496 | { |
7f1d2f82 | 497 | struct trace_event_file *file; |
0e907c99 Z |
498 | |
499 | mutex_lock(&event_mutex); | |
ae63b31e SR |
500 | list_for_each_entry(file, &tr->events, list) { |
501 | ftrace_event_enable_disable(file, 0); | |
0e907c99 Z |
502 | } |
503 | mutex_unlock(&event_mutex); | |
504 | } | |
505 | ||
c37775d5 SR |
506 | static void |
507 | event_filter_pid_sched_process_exit(void *data, struct task_struct *task) | |
508 | { | |
509 | struct trace_pid_list *pid_list; | |
510 | struct trace_array *tr = data; | |
511 | ||
da25a672 | 512 | pid_list = rcu_dereference_raw(tr->filtered_pids); |
4e267db1 | 513 | trace_filter_add_remove_task(pid_list, NULL, task); |
27683626 SRV |
514 | |
515 | pid_list = rcu_dereference_raw(tr->filtered_no_pids); | |
516 | trace_filter_add_remove_task(pid_list, NULL, task); | |
c37775d5 SR |
517 | } |
518 | ||
519 | static void | |
520 | event_filter_pid_sched_process_fork(void *data, | |
521 | struct task_struct *self, | |
522 | struct task_struct *task) | |
523 | { | |
524 | struct trace_pid_list *pid_list; | |
525 | struct trace_array *tr = data; | |
526 | ||
527 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
4e267db1 | 528 | trace_filter_add_remove_task(pid_list, self, task); |
27683626 SRV |
529 | |
530 | pid_list = rcu_dereference_sched(tr->filtered_no_pids); | |
531 | trace_filter_add_remove_task(pid_list, self, task); | |
c37775d5 SR |
532 | } |
533 | ||
534 | void trace_event_follow_fork(struct trace_array *tr, bool enable) | |
535 | { | |
536 | if (enable) { | |
537 | register_trace_prio_sched_process_fork(event_filter_pid_sched_process_fork, | |
538 | tr, INT_MIN); | |
afcab636 | 539 | register_trace_prio_sched_process_free(event_filter_pid_sched_process_exit, |
c37775d5 SR |
540 | tr, INT_MAX); |
541 | } else { | |
542 | unregister_trace_sched_process_fork(event_filter_pid_sched_process_fork, | |
543 | tr); | |
afcab636 | 544 | unregister_trace_sched_process_free(event_filter_pid_sched_process_exit, |
c37775d5 SR |
545 | tr); |
546 | } | |
3fdaf80f SRRH |
547 | } |
548 | ||
549 | static void | |
22402cd0 | 550 | event_filter_pid_sched_switch_probe_pre(void *data, bool preempt, |
3fdaf80f SRRH |
551 | struct task_struct *prev, struct task_struct *next) |
552 | { | |
553 | struct trace_array *tr = data; | |
27683626 | 554 | struct trace_pid_list *no_pid_list; |
3fdaf80f | 555 | struct trace_pid_list *pid_list; |
27683626 | 556 | bool ret; |
3fdaf80f SRRH |
557 | |
558 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
27683626 | 559 | no_pid_list = rcu_dereference_sched(tr->filtered_no_pids); |
3fdaf80f | 560 | |
27683626 SRV |
561 | /* |
562 | * Sched switch is funny, as we only want to ignore it | |
563 | * in the notrace case if both prev and next should be ignored. | |
564 | */ | |
565 | ret = trace_ignore_this_task(NULL, no_pid_list, prev) && | |
566 | trace_ignore_this_task(NULL, no_pid_list, next); | |
567 | ||
568 | this_cpu_write(tr->array_buffer.data->ignore_pid, ret || | |
569 | (trace_ignore_this_task(pid_list, NULL, prev) && | |
570 | trace_ignore_this_task(pid_list, NULL, next))); | |
3fdaf80f SRRH |
571 | } |
572 | ||
573 | static void | |
22402cd0 | 574 | event_filter_pid_sched_switch_probe_post(void *data, bool preempt, |
3fdaf80f SRRH |
575 | struct task_struct *prev, struct task_struct *next) |
576 | { | |
577 | struct trace_array *tr = data; | |
27683626 | 578 | struct trace_pid_list *no_pid_list; |
3fdaf80f SRRH |
579 | struct trace_pid_list *pid_list; |
580 | ||
581 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
27683626 | 582 | no_pid_list = rcu_dereference_sched(tr->filtered_no_pids); |
3fdaf80f | 583 | |
1c5eb448 | 584 | this_cpu_write(tr->array_buffer.data->ignore_pid, |
27683626 | 585 | trace_ignore_this_task(pid_list, no_pid_list, next)); |
3fdaf80f SRRH |
586 | } |
587 | ||
588 | static void | |
589 | event_filter_pid_sched_wakeup_probe_pre(void *data, struct task_struct *task) | |
590 | { | |
591 | struct trace_array *tr = data; | |
27683626 | 592 | struct trace_pid_list *no_pid_list; |
3fdaf80f SRRH |
593 | struct trace_pid_list *pid_list; |
594 | ||
595 | /* Nothing to do if we are already tracing */ | |
1c5eb448 | 596 | if (!this_cpu_read(tr->array_buffer.data->ignore_pid)) |
3fdaf80f SRRH |
597 | return; |
598 | ||
599 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
27683626 | 600 | no_pid_list = rcu_dereference_sched(tr->filtered_no_pids); |
3fdaf80f | 601 | |
1c5eb448 | 602 | this_cpu_write(tr->array_buffer.data->ignore_pid, |
27683626 | 603 | trace_ignore_this_task(pid_list, no_pid_list, task)); |
3fdaf80f SRRH |
604 | } |
605 | ||
606 | static void | |
607 | event_filter_pid_sched_wakeup_probe_post(void *data, struct task_struct *task) | |
608 | { | |
609 | struct trace_array *tr = data; | |
27683626 | 610 | struct trace_pid_list *no_pid_list; |
3fdaf80f SRRH |
611 | struct trace_pid_list *pid_list; |
612 | ||
613 | /* Nothing to do if we are not tracing */ | |
1c5eb448 | 614 | if (this_cpu_read(tr->array_buffer.data->ignore_pid)) |
3fdaf80f SRRH |
615 | return; |
616 | ||
617 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
27683626 | 618 | no_pid_list = rcu_dereference_sched(tr->filtered_no_pids); |
3fdaf80f SRRH |
619 | |
620 | /* Set tracing if current is enabled */ | |
1c5eb448 | 621 | this_cpu_write(tr->array_buffer.data->ignore_pid, |
27683626 | 622 | trace_ignore_this_task(pid_list, no_pid_list, current)); |
3fdaf80f SRRH |
623 | } |
624 | ||
27683626 | 625 | static void unregister_pid_events(struct trace_array *tr) |
49090107 | 626 | { |
3fdaf80f SRRH |
627 | unregister_trace_sched_switch(event_filter_pid_sched_switch_probe_pre, tr); |
628 | unregister_trace_sched_switch(event_filter_pid_sched_switch_probe_post, tr); | |
629 | ||
630 | unregister_trace_sched_wakeup(event_filter_pid_sched_wakeup_probe_pre, tr); | |
631 | unregister_trace_sched_wakeup(event_filter_pid_sched_wakeup_probe_post, tr); | |
632 | ||
0f72e37e SRRH |
633 | unregister_trace_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_pre, tr); |
634 | unregister_trace_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_post, tr); | |
635 | ||
636 | unregister_trace_sched_waking(event_filter_pid_sched_wakeup_probe_pre, tr); | |
637 | unregister_trace_sched_waking(event_filter_pid_sched_wakeup_probe_post, tr); | |
27683626 | 638 | } |
0f72e37e | 639 | |
27683626 SRV |
640 | static void __ftrace_clear_event_pids(struct trace_array *tr, int type) |
641 | { | |
642 | struct trace_pid_list *pid_list; | |
643 | struct trace_pid_list *no_pid_list; | |
644 | struct trace_event_file *file; | |
645 | int cpu; | |
646 | ||
647 | pid_list = rcu_dereference_protected(tr->filtered_pids, | |
648 | lockdep_is_held(&event_mutex)); | |
649 | no_pid_list = rcu_dereference_protected(tr->filtered_no_pids, | |
650 | lockdep_is_held(&event_mutex)); | |
651 | ||
652 | /* Make sure there's something to do */ | |
653 | if (!pid_type_enabled(type, pid_list, no_pid_list)) | |
654 | return; | |
655 | ||
656 | if (!still_need_pid_events(type, pid_list, no_pid_list)) { | |
657 | unregister_pid_events(tr); | |
658 | ||
659 | list_for_each_entry(file, &tr->events, list) { | |
660 | clear_bit(EVENT_FILE_FL_PID_FILTER_BIT, &file->flags); | |
661 | } | |
662 | ||
663 | for_each_possible_cpu(cpu) | |
664 | per_cpu_ptr(tr->array_buffer.data, cpu)->ignore_pid = false; | |
3fdaf80f SRRH |
665 | } |
666 | ||
27683626 SRV |
667 | if (type & TRACE_PIDS) |
668 | rcu_assign_pointer(tr->filtered_pids, NULL); | |
3fdaf80f | 669 | |
27683626 SRV |
670 | if (type & TRACE_NO_PIDS) |
671 | rcu_assign_pointer(tr->filtered_no_pids, NULL); | |
49090107 SRRH |
672 | |
673 | /* Wait till all users are no longer using pid filtering */ | |
e0a568dc | 674 | tracepoint_synchronize_unregister(); |
49090107 | 675 | |
27683626 SRV |
676 | if ((type & TRACE_PIDS) && pid_list) |
677 | trace_free_pid_list(pid_list); | |
678 | ||
679 | if ((type & TRACE_NO_PIDS) && no_pid_list) | |
680 | trace_free_pid_list(no_pid_list); | |
49090107 SRRH |
681 | } |
682 | ||
27683626 | 683 | static void ftrace_clear_event_pids(struct trace_array *tr, int type) |
49090107 SRRH |
684 | { |
685 | mutex_lock(&event_mutex); | |
27683626 | 686 | __ftrace_clear_event_pids(tr, type); |
49090107 SRRH |
687 | mutex_unlock(&event_mutex); |
688 | } | |
689 | ||
e9dbfae5 SR |
690 | static void __put_system(struct event_subsystem *system) |
691 | { | |
692 | struct event_filter *filter = system->filter; | |
693 | ||
6e94a780 SR |
694 | WARN_ON_ONCE(system_refcount(system) == 0); |
695 | if (system_refcount_dec(system)) | |
e9dbfae5 SR |
696 | return; |
697 | ||
ae63b31e SR |
698 | list_del(&system->list); |
699 | ||
e9dbfae5 SR |
700 | if (filter) { |
701 | kfree(filter->filter_string); | |
702 | kfree(filter); | |
703 | } | |
79ac6ef5 | 704 | kfree_const(system->name); |
e9dbfae5 SR |
705 | kfree(system); |
706 | } | |
707 | ||
708 | static void __get_system(struct event_subsystem *system) | |
709 | { | |
6e94a780 SR |
710 | WARN_ON_ONCE(system_refcount(system) == 0); |
711 | system_refcount_inc(system); | |
e9dbfae5 SR |
712 | } |
713 | ||
7967b3e0 | 714 | static void __get_system_dir(struct trace_subsystem_dir *dir) |
ae63b31e SR |
715 | { |
716 | WARN_ON_ONCE(dir->ref_count == 0); | |
717 | dir->ref_count++; | |
718 | __get_system(dir->subsystem); | |
719 | } | |
720 | ||
7967b3e0 | 721 | static void __put_system_dir(struct trace_subsystem_dir *dir) |
ae63b31e SR |
722 | { |
723 | WARN_ON_ONCE(dir->ref_count == 0); | |
724 | /* If the subsystem is about to be freed, the dir must be too */ | |
6e94a780 | 725 | WARN_ON_ONCE(system_refcount(dir->subsystem) == 1 && dir->ref_count != 1); |
ae63b31e SR |
726 | |
727 | __put_system(dir->subsystem); | |
728 | if (!--dir->ref_count) | |
729 | kfree(dir); | |
730 | } | |
731 | ||
7967b3e0 | 732 | static void put_system(struct trace_subsystem_dir *dir) |
e9dbfae5 SR |
733 | { |
734 | mutex_lock(&event_mutex); | |
ae63b31e | 735 | __put_system_dir(dir); |
e9dbfae5 SR |
736 | mutex_unlock(&event_mutex); |
737 | } | |
738 | ||
7967b3e0 | 739 | static void remove_subsystem(struct trace_subsystem_dir *dir) |
f6a84bdc ON |
740 | { |
741 | if (!dir) | |
742 | return; | |
743 | ||
744 | if (!--dir->nr_events) { | |
a3d1e7eb | 745 | tracefs_remove(dir->entry); |
f6a84bdc ON |
746 | list_del(&dir->list); |
747 | __put_system_dir(dir); | |
748 | } | |
749 | } | |
750 | ||
7f1d2f82 | 751 | static void remove_event_file_dir(struct trace_event_file *file) |
f6a84bdc | 752 | { |
bf682c31 ON |
753 | struct dentry *dir = file->dir; |
754 | struct dentry *child; | |
755 | ||
756 | if (dir) { | |
757 | spin_lock(&dir->d_lock); /* probably unneeded */ | |
946e51f2 | 758 | list_for_each_entry(child, &dir->d_subdirs, d_child) { |
7682c918 DH |
759 | if (d_really_is_positive(child)) /* probably unneeded */ |
760 | d_inode(child)->i_private = NULL; | |
bf682c31 ON |
761 | } |
762 | spin_unlock(&dir->d_lock); | |
763 | ||
a3d1e7eb | 764 | tracefs_remove(dir); |
bf682c31 ON |
765 | } |
766 | ||
f6a84bdc | 767 | list_del(&file->list); |
f6a84bdc | 768 | remove_subsystem(file->system); |
2448e349 | 769 | free_event_filter(file->filter); |
f6a84bdc ON |
770 | kmem_cache_free(file_cachep, file); |
771 | } | |
772 | ||
8f31bfe5 LZ |
773 | /* |
774 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
775 | */ | |
2a6c24af SRRH |
776 | static int |
777 | __ftrace_set_clr_event_nolock(struct trace_array *tr, const char *match, | |
778 | const char *sub, const char *event, int set) | |
b77e38aa | 779 | { |
7f1d2f82 | 780 | struct trace_event_file *file; |
2425bcb9 | 781 | struct trace_event_call *call; |
de7b2973 | 782 | const char *name; |
29f93943 | 783 | int ret = -EINVAL; |
989a0a3d | 784 | int eret = 0; |
8f31bfe5 | 785 | |
ae63b31e SR |
786 | list_for_each_entry(file, &tr->events, list) { |
787 | ||
788 | call = file->event_call; | |
687fcc4a | 789 | name = trace_event_name(call); |
8f31bfe5 | 790 | |
de7b2973 | 791 | if (!name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
792 | continue; |
793 | ||
9b63776f SR |
794 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
795 | continue; | |
796 | ||
8f31bfe5 | 797 | if (match && |
de7b2973 | 798 | strcmp(match, name) != 0 && |
8f082018 | 799 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
800 | continue; |
801 | ||
8f082018 | 802 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
803 | continue; |
804 | ||
de7b2973 | 805 | if (event && strcmp(event, name) != 0) |
8f31bfe5 LZ |
806 | continue; |
807 | ||
989a0a3d | 808 | ret = ftrace_event_enable_disable(file, set); |
8f31bfe5 | 809 | |
989a0a3d SRRH |
810 | /* |
811 | * Save the first error and return that. Some events | |
812 | * may still have been enabled, but let the user | |
813 | * know that something went wrong. | |
814 | */ | |
815 | if (ret && !eret) | |
816 | eret = ret; | |
817 | ||
818 | ret = eret; | |
8f31bfe5 | 819 | } |
2a6c24af SRRH |
820 | |
821 | return ret; | |
822 | } | |
823 | ||
824 | static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, | |
825 | const char *sub, const char *event, int set) | |
826 | { | |
827 | int ret; | |
828 | ||
829 | mutex_lock(&event_mutex); | |
830 | ret = __ftrace_set_clr_event_nolock(tr, match, sub, event, set); | |
8f31bfe5 LZ |
831 | mutex_unlock(&event_mutex); |
832 | ||
833 | return ret; | |
834 | } | |
835 | ||
595a438c | 836 | int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set) |
8f31bfe5 | 837 | { |
b628b3e6 | 838 | char *event = NULL, *sub = NULL, *match; |
84fce9db | 839 | int ret; |
b628b3e6 | 840 | |
953ae45a DI |
841 | if (!tr) |
842 | return -ENOENT; | |
b628b3e6 SR |
843 | /* |
844 | * The buf format can be <subsystem>:<event-name> | |
845 | * *:<event-name> means any event by that name. | |
846 | * :<event-name> is the same. | |
847 | * | |
848 | * <subsystem>:* means all events in that subsystem | |
849 | * <subsystem>: means the same. | |
850 | * | |
851 | * <name> (no ':') means all events in a subsystem with | |
852 | * the name <name> or any event that matches <name> | |
853 | */ | |
854 | ||
855 | match = strsep(&buf, ":"); | |
856 | if (buf) { | |
857 | sub = match; | |
858 | event = buf; | |
859 | match = NULL; | |
860 | ||
861 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
862 | sub = NULL; | |
863 | if (!strlen(event) || strcmp(event, "*") == 0) | |
864 | event = NULL; | |
865 | } | |
b77e38aa | 866 | |
84fce9db JK |
867 | ret = __ftrace_set_clr_event(tr, match, sub, event, set); |
868 | ||
869 | /* Put back the colon to allow this to be called again */ | |
870 | if (buf) | |
871 | *(buf - 1) = ':'; | |
872 | ||
873 | return ret; | |
b77e38aa SR |
874 | } |
875 | ||
4671c794 SR |
876 | /** |
877 | * trace_set_clr_event - enable or disable an event | |
878 | * @system: system name to match (NULL for any system) | |
879 | * @event: event name to match (NULL for all events, within system) | |
880 | * @set: 1 to enable, 0 to disable | |
881 | * | |
882 | * This is a way for other parts of the kernel to enable or disable | |
883 | * event recording. | |
884 | * | |
885 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
886 | * registered events. | |
887 | */ | |
888 | int trace_set_clr_event(const char *system, const char *event, int set) | |
889 | { | |
ae63b31e SR |
890 | struct trace_array *tr = top_trace_array(); |
891 | ||
dc81e5e3 YY |
892 | if (!tr) |
893 | return -ENODEV; | |
894 | ||
ae63b31e | 895 | return __ftrace_set_clr_event(tr, NULL, system, event, set); |
4671c794 | 896 | } |
56355b83 | 897 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 898 | |
28879787 DI |
899 | /** |
900 | * trace_array_set_clr_event - enable or disable an event for a trace array. | |
901 | * @tr: concerned trace array. | |
902 | * @system: system name to match (NULL for any system) | |
903 | * @event: event name to match (NULL for all events, within system) | |
904 | * @enable: true to enable, false to disable | |
905 | * | |
906 | * This is a way for other parts of the kernel to enable or disable | |
907 | * event recording. | |
908 | * | |
909 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
910 | * registered events. | |
911 | */ | |
912 | int trace_array_set_clr_event(struct trace_array *tr, const char *system, | |
913 | const char *event, bool enable) | |
914 | { | |
915 | int set; | |
916 | ||
917 | if (!tr) | |
918 | return -ENOENT; | |
919 | ||
920 | set = (enable == true) ? 1 : 0; | |
921 | return __ftrace_set_clr_event(tr, NULL, system, event, set); | |
922 | } | |
923 | EXPORT_SYMBOL_GPL(trace_array_set_clr_event); | |
924 | ||
b77e38aa SR |
925 | /* 128 should be much more than enough */ |
926 | #define EVENT_BUF_SIZE 127 | |
927 | ||
928 | static ssize_t | |
929 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
930 | size_t cnt, loff_t *ppos) | |
931 | { | |
48966364 | 932 | struct trace_parser parser; |
ae63b31e SR |
933 | struct seq_file *m = file->private_data; |
934 | struct trace_array *tr = m->private; | |
4ba7978e | 935 | ssize_t read, ret; |
b77e38aa | 936 | |
4ba7978e | 937 | if (!cnt) |
b77e38aa SR |
938 | return 0; |
939 | ||
1852fcce SR |
940 | ret = tracing_update_buffers(); |
941 | if (ret < 0) | |
942 | return ret; | |
943 | ||
48966364 | 944 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
945 | return -ENOMEM; |
946 | ||
48966364 | 947 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
948 | ||
4ba7978e | 949 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 950 | int set = 1; |
b77e38aa | 951 | |
48966364 | 952 | if (*parser.buffer == '!') |
b77e38aa | 953 | set = 0; |
b77e38aa | 954 | |
ae63b31e | 955 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
b77e38aa | 956 | if (ret) |
48966364 | 957 | goto out_put; |
b77e38aa | 958 | } |
b77e38aa SR |
959 | |
960 | ret = read; | |
961 | ||
48966364 | 962 | out_put: |
963 | trace_parser_put(&parser); | |
b77e38aa SR |
964 | |
965 | return ret; | |
966 | } | |
967 | ||
968 | static void * | |
969 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
970 | { | |
7f1d2f82 | 971 | struct trace_event_file *file = v; |
2425bcb9 | 972 | struct trace_event_call *call; |
ae63b31e | 973 | struct trace_array *tr = m->private; |
b77e38aa SR |
974 | |
975 | (*pos)++; | |
976 | ||
ae63b31e SR |
977 | list_for_each_entry_continue(file, &tr->events, list) { |
978 | call = file->event_call; | |
40e26815 SR |
979 | /* |
980 | * The ftrace subsystem is for showing formats only. | |
981 | * They can not be enabled or disabled via the event files. | |
982 | */ | |
d045437a SRRH |
983 | if (call->class && call->class->reg && |
984 | !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) | |
ae63b31e | 985 | return file; |
40e26815 | 986 | } |
b77e38aa | 987 | |
30bd39cd | 988 | return NULL; |
b77e38aa SR |
989 | } |
990 | ||
991 | static void *t_start(struct seq_file *m, loff_t *pos) | |
992 | { | |
7f1d2f82 | 993 | struct trace_event_file *file; |
ae63b31e | 994 | struct trace_array *tr = m->private; |
e1c7e2a6 LZ |
995 | loff_t l; |
996 | ||
20c8928a | 997 | mutex_lock(&event_mutex); |
e1c7e2a6 | 998 | |
7f1d2f82 | 999 | file = list_entry(&tr->events, struct trace_event_file, list); |
e1c7e2a6 | 1000 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
1001 | file = t_next(m, file, &l); |
1002 | if (!file) | |
e1c7e2a6 LZ |
1003 | break; |
1004 | } | |
ae63b31e | 1005 | return file; |
b77e38aa SR |
1006 | } |
1007 | ||
1008 | static void * | |
1009 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
1010 | { | |
7f1d2f82 | 1011 | struct trace_event_file *file = v; |
ae63b31e | 1012 | struct trace_array *tr = m->private; |
b77e38aa SR |
1013 | |
1014 | (*pos)++; | |
1015 | ||
ae63b31e | 1016 | list_for_each_entry_continue(file, &tr->events, list) { |
5d6ad960 | 1017 | if (file->flags & EVENT_FILE_FL_ENABLED) |
ae63b31e | 1018 | return file; |
b77e38aa SR |
1019 | } |
1020 | ||
30bd39cd | 1021 | return NULL; |
b77e38aa SR |
1022 | } |
1023 | ||
1024 | static void *s_start(struct seq_file *m, loff_t *pos) | |
1025 | { | |
7f1d2f82 | 1026 | struct trace_event_file *file; |
ae63b31e | 1027 | struct trace_array *tr = m->private; |
e1c7e2a6 LZ |
1028 | loff_t l; |
1029 | ||
20c8928a | 1030 | mutex_lock(&event_mutex); |
e1c7e2a6 | 1031 | |
7f1d2f82 | 1032 | file = list_entry(&tr->events, struct trace_event_file, list); |
e1c7e2a6 | 1033 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
1034 | file = s_next(m, file, &l); |
1035 | if (!file) | |
e1c7e2a6 LZ |
1036 | break; |
1037 | } | |
ae63b31e | 1038 | return file; |
b77e38aa SR |
1039 | } |
1040 | ||
1041 | static int t_show(struct seq_file *m, void *v) | |
1042 | { | |
7f1d2f82 | 1043 | struct trace_event_file *file = v; |
2425bcb9 | 1044 | struct trace_event_call *call = file->event_call; |
b77e38aa | 1045 | |
8f082018 SR |
1046 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
1047 | seq_printf(m, "%s:", call->class->system); | |
687fcc4a | 1048 | seq_printf(m, "%s\n", trace_event_name(call)); |
b77e38aa SR |
1049 | |
1050 | return 0; | |
1051 | } | |
1052 | ||
1053 | static void t_stop(struct seq_file *m, void *p) | |
1054 | { | |
20c8928a | 1055 | mutex_unlock(&event_mutex); |
b77e38aa SR |
1056 | } |
1057 | ||
f4d34a87 | 1058 | static void * |
27683626 | 1059 | __next(struct seq_file *m, void *v, loff_t *pos, int type) |
f4d34a87 SR |
1060 | { |
1061 | struct trace_array *tr = m->private; | |
27683626 SRV |
1062 | struct trace_pid_list *pid_list; |
1063 | ||
1064 | if (type == TRACE_PIDS) | |
1065 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
1066 | else | |
1067 | pid_list = rcu_dereference_sched(tr->filtered_no_pids); | |
f4d34a87 | 1068 | |
5cc8976b | 1069 | return trace_pid_next(pid_list, v, pos); |
f4d34a87 SR |
1070 | } |
1071 | ||
27683626 SRV |
1072 | static void * |
1073 | p_next(struct seq_file *m, void *v, loff_t *pos) | |
1074 | { | |
1075 | return __next(m, v, pos, TRACE_PIDS); | |
1076 | } | |
1077 | ||
1078 | static void * | |
1079 | np_next(struct seq_file *m, void *v, loff_t *pos) | |
1080 | { | |
1081 | return __next(m, v, pos, TRACE_NO_PIDS); | |
1082 | } | |
1083 | ||
1084 | static void *__start(struct seq_file *m, loff_t *pos, int type) | |
fb662288 | 1085 | __acquires(RCU) |
49090107 SRRH |
1086 | { |
1087 | struct trace_pid_list *pid_list; | |
1088 | struct trace_array *tr = m->private; | |
1089 | ||
1090 | /* | |
1091 | * Grab the mutex, to keep calls to p_next() having the same | |
1092 | * tr->filtered_pids as p_start() has. | |
1093 | * If we just passed the tr->filtered_pids around, then RCU would | |
1094 | * have been enough, but doing that makes things more complex. | |
1095 | */ | |
1096 | mutex_lock(&event_mutex); | |
1097 | rcu_read_lock_sched(); | |
1098 | ||
27683626 SRV |
1099 | if (type == TRACE_PIDS) |
1100 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
1101 | else | |
1102 | pid_list = rcu_dereference_sched(tr->filtered_no_pids); | |
49090107 | 1103 | |
f4d34a87 | 1104 | if (!pid_list) |
49090107 SRRH |
1105 | return NULL; |
1106 | ||
5cc8976b | 1107 | return trace_pid_start(pid_list, pos); |
49090107 SRRH |
1108 | } |
1109 | ||
27683626 SRV |
1110 | static void *p_start(struct seq_file *m, loff_t *pos) |
1111 | __acquires(RCU) | |
1112 | { | |
1113 | return __start(m, pos, TRACE_PIDS); | |
1114 | } | |
1115 | ||
1116 | static void *np_start(struct seq_file *m, loff_t *pos) | |
1117 | __acquires(RCU) | |
1118 | { | |
1119 | return __start(m, pos, TRACE_NO_PIDS); | |
1120 | } | |
1121 | ||
49090107 | 1122 | static void p_stop(struct seq_file *m, void *p) |
fb662288 | 1123 | __releases(RCU) |
49090107 SRRH |
1124 | { |
1125 | rcu_read_unlock_sched(); | |
1126 | mutex_unlock(&event_mutex); | |
1127 | } | |
1128 | ||
1473e441 SR |
1129 | static ssize_t |
1130 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1131 | loff_t *ppos) | |
1132 | { | |
7f1d2f82 | 1133 | struct trace_event_file *file; |
bc6f6b08 | 1134 | unsigned long flags; |
a4390596 TZ |
1135 | char buf[4] = "0"; |
1136 | ||
bc6f6b08 ON |
1137 | mutex_lock(&event_mutex); |
1138 | file = event_file_data(filp); | |
1139 | if (likely(file)) | |
1140 | flags = file->flags; | |
1141 | mutex_unlock(&event_mutex); | |
1142 | ||
1143 | if (!file) | |
1144 | return -ENODEV; | |
1145 | ||
5d6ad960 SRRH |
1146 | if (flags & EVENT_FILE_FL_ENABLED && |
1147 | !(flags & EVENT_FILE_FL_SOFT_DISABLED)) | |
a4390596 TZ |
1148 | strcpy(buf, "1"); |
1149 | ||
5d6ad960 SRRH |
1150 | if (flags & EVENT_FILE_FL_SOFT_DISABLED || |
1151 | flags & EVENT_FILE_FL_SOFT_MODE) | |
a4390596 TZ |
1152 | strcat(buf, "*"); |
1153 | ||
1154 | strcat(buf, "\n"); | |
1473e441 | 1155 | |
417944c4 | 1156 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf)); |
1473e441 SR |
1157 | } |
1158 | ||
1159 | static ssize_t | |
1160 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1161 | loff_t *ppos) | |
1162 | { | |
7f1d2f82 | 1163 | struct trace_event_file *file; |
1473e441 SR |
1164 | unsigned long val; |
1165 | int ret; | |
1166 | ||
22fe9b54 PH |
1167 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
1168 | if (ret) | |
1473e441 SR |
1169 | return ret; |
1170 | ||
1852fcce SR |
1171 | ret = tracing_update_buffers(); |
1172 | if (ret < 0) | |
1173 | return ret; | |
1174 | ||
1473e441 SR |
1175 | switch (val) { |
1176 | case 0: | |
1473e441 | 1177 | case 1: |
bc6f6b08 | 1178 | ret = -ENODEV; |
11a241a3 | 1179 | mutex_lock(&event_mutex); |
bc6f6b08 ON |
1180 | file = event_file_data(filp); |
1181 | if (likely(file)) | |
1182 | ret = ftrace_event_enable_disable(file, val); | |
11a241a3 | 1183 | mutex_unlock(&event_mutex); |
1473e441 SR |
1184 | break; |
1185 | ||
1186 | default: | |
1187 | return -EINVAL; | |
1188 | } | |
1189 | ||
1190 | *ppos += cnt; | |
1191 | ||
3b8e4273 | 1192 | return ret ? ret : cnt; |
1473e441 SR |
1193 | } |
1194 | ||
8ae79a13 SR |
1195 | static ssize_t |
1196 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1197 | loff_t *ppos) | |
1198 | { | |
c142b15d | 1199 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
7967b3e0 | 1200 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1201 | struct event_subsystem *system = dir->subsystem; |
2425bcb9 | 1202 | struct trace_event_call *call; |
7f1d2f82 | 1203 | struct trace_event_file *file; |
ae63b31e | 1204 | struct trace_array *tr = dir->tr; |
8ae79a13 | 1205 | char buf[2]; |
c142b15d | 1206 | int set = 0; |
8ae79a13 SR |
1207 | int ret; |
1208 | ||
8ae79a13 | 1209 | mutex_lock(&event_mutex); |
ae63b31e SR |
1210 | list_for_each_entry(file, &tr->events, list) { |
1211 | call = file->event_call; | |
256cfdd6 SRV |
1212 | if ((call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) || |
1213 | !trace_event_name(call) || !call->class || !call->class->reg) | |
8ae79a13 SR |
1214 | continue; |
1215 | ||
40ee4dff | 1216 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
1217 | continue; |
1218 | ||
1219 | /* | |
1220 | * We need to find out if all the events are set | |
1221 | * or if all events or cleared, or if we have | |
1222 | * a mixture. | |
1223 | */ | |
5d6ad960 | 1224 | set |= (1 << !!(file->flags & EVENT_FILE_FL_ENABLED)); |
c142b15d | 1225 | |
8ae79a13 SR |
1226 | /* |
1227 | * If we have a mixture, no need to look further. | |
1228 | */ | |
c142b15d | 1229 | if (set == 3) |
8ae79a13 SR |
1230 | break; |
1231 | } | |
1232 | mutex_unlock(&event_mutex); | |
1233 | ||
c142b15d | 1234 | buf[0] = set_to_char[set]; |
8ae79a13 | 1235 | buf[1] = '\n'; |
8ae79a13 SR |
1236 | |
1237 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
1238 | ||
1239 | return ret; | |
1240 | } | |
1241 | ||
1242 | static ssize_t | |
1243 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1244 | loff_t *ppos) | |
1245 | { | |
7967b3e0 | 1246 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1247 | struct event_subsystem *system = dir->subsystem; |
40ee4dff | 1248 | const char *name = NULL; |
8ae79a13 | 1249 | unsigned long val; |
8ae79a13 SR |
1250 | ssize_t ret; |
1251 | ||
22fe9b54 PH |
1252 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
1253 | if (ret) | |
8ae79a13 SR |
1254 | return ret; |
1255 | ||
1256 | ret = tracing_update_buffers(); | |
1257 | if (ret < 0) | |
1258 | return ret; | |
1259 | ||
8f31bfe5 | 1260 | if (val != 0 && val != 1) |
8ae79a13 | 1261 | return -EINVAL; |
8ae79a13 | 1262 | |
40ee4dff SR |
1263 | /* |
1264 | * Opening of "enable" adds a ref count to system, | |
1265 | * so the name is safe to use. | |
1266 | */ | |
1267 | if (system) | |
1268 | name = system->name; | |
1269 | ||
ae63b31e | 1270 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
8ae79a13 | 1271 | if (ret) |
8f31bfe5 | 1272 | goto out; |
8ae79a13 SR |
1273 | |
1274 | ret = cnt; | |
1275 | ||
8f31bfe5 | 1276 | out: |
8ae79a13 SR |
1277 | *ppos += cnt; |
1278 | ||
1279 | return ret; | |
1280 | } | |
1281 | ||
2a37a3df SR |
1282 | enum { |
1283 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
1284 | FORMAT_FIELD_SEPERATOR = 2, |
1285 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
1286 | }; |
1287 | ||
1288 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 1289 | { |
2425bcb9 | 1290 | struct trace_event_call *call = event_file_data(m->private); |
86397dc3 LZ |
1291 | struct list_head *common_head = &ftrace_common_fields; |
1292 | struct list_head *head = trace_get_fields(call); | |
7710b639 | 1293 | struct list_head *node = v; |
981d081e | 1294 | |
2a37a3df | 1295 | (*pos)++; |
5a65e956 | 1296 | |
2a37a3df SR |
1297 | switch ((unsigned long)v) { |
1298 | case FORMAT_HEADER: | |
7710b639 ON |
1299 | node = common_head; |
1300 | break; | |
5a65e956 | 1301 | |
86397dc3 | 1302 | case FORMAT_FIELD_SEPERATOR: |
7710b639 ON |
1303 | node = head; |
1304 | break; | |
5a65e956 | 1305 | |
2a37a3df SR |
1306 | case FORMAT_PRINTFMT: |
1307 | /* all done */ | |
1308 | return NULL; | |
5a65e956 LJ |
1309 | } |
1310 | ||
7710b639 ON |
1311 | node = node->prev; |
1312 | if (node == common_head) | |
86397dc3 | 1313 | return (void *)FORMAT_FIELD_SEPERATOR; |
7710b639 | 1314 | else if (node == head) |
2a37a3df | 1315 | return (void *)FORMAT_PRINTFMT; |
7710b639 ON |
1316 | else |
1317 | return node; | |
2a37a3df SR |
1318 | } |
1319 | ||
1320 | static int f_show(struct seq_file *m, void *v) | |
1321 | { | |
2425bcb9 | 1322 | struct trace_event_call *call = event_file_data(m->private); |
2a37a3df SR |
1323 | struct ftrace_event_field *field; |
1324 | const char *array_descriptor; | |
1325 | ||
1326 | switch ((unsigned long)v) { | |
1327 | case FORMAT_HEADER: | |
687fcc4a | 1328 | seq_printf(m, "name: %s\n", trace_event_name(call)); |
2a37a3df | 1329 | seq_printf(m, "ID: %d\n", call->event.type); |
fa6f0cc7 | 1330 | seq_puts(m, "format:\n"); |
8728fe50 | 1331 | return 0; |
5a65e956 | 1332 | |
86397dc3 LZ |
1333 | case FORMAT_FIELD_SEPERATOR: |
1334 | seq_putc(m, '\n'); | |
1335 | return 0; | |
1336 | ||
2a37a3df SR |
1337 | case FORMAT_PRINTFMT: |
1338 | seq_printf(m, "\nprint fmt: %s\n", | |
1339 | call->print_fmt); | |
1340 | return 0; | |
981d081e | 1341 | } |
8728fe50 | 1342 | |
7710b639 | 1343 | field = list_entry(v, struct ftrace_event_field, link); |
2a37a3df SR |
1344 | /* |
1345 | * Smartly shows the array type(except dynamic array). | |
1346 | * Normal: | |
1347 | * field:TYPE VAR | |
1348 | * If TYPE := TYPE[LEN], it is shown: | |
1349 | * field:TYPE VAR[LEN] | |
1350 | */ | |
1351 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 1352 | |
b6b27355 | 1353 | if (str_has_prefix(field->type, "__data_loc")) |
2a37a3df | 1354 | array_descriptor = NULL; |
8728fe50 | 1355 | |
2a37a3df SR |
1356 | if (!array_descriptor) |
1357 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
1358 | field->type, field->name, field->offset, | |
1359 | field->size, !!field->is_signed); | |
1360 | else | |
1361 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
1362 | (int)(array_descriptor - field->type), | |
1363 | field->type, field->name, | |
1364 | array_descriptor, field->offset, | |
1365 | field->size, !!field->is_signed); | |
8728fe50 | 1366 | |
2a37a3df SR |
1367 | return 0; |
1368 | } | |
5a65e956 | 1369 | |
7710b639 ON |
1370 | static void *f_start(struct seq_file *m, loff_t *pos) |
1371 | { | |
1372 | void *p = (void *)FORMAT_HEADER; | |
1373 | loff_t l = 0; | |
1374 | ||
c5a44a12 ON |
1375 | /* ->stop() is called even if ->start() fails */ |
1376 | mutex_lock(&event_mutex); | |
1377 | if (!event_file_data(m->private)) | |
1378 | return ERR_PTR(-ENODEV); | |
1379 | ||
7710b639 ON |
1380 | while (l < *pos && p) |
1381 | p = f_next(m, p, &l); | |
1382 | ||
1383 | return p; | |
1384 | } | |
1385 | ||
2a37a3df SR |
1386 | static void f_stop(struct seq_file *m, void *p) |
1387 | { | |
c5a44a12 | 1388 | mutex_unlock(&event_mutex); |
2a37a3df | 1389 | } |
981d081e | 1390 | |
2a37a3df SR |
1391 | static const struct seq_operations trace_format_seq_ops = { |
1392 | .start = f_start, | |
1393 | .next = f_next, | |
1394 | .stop = f_stop, | |
1395 | .show = f_show, | |
1396 | }; | |
1397 | ||
1398 | static int trace_format_open(struct inode *inode, struct file *file) | |
1399 | { | |
2a37a3df SR |
1400 | struct seq_file *m; |
1401 | int ret; | |
1402 | ||
17911ff3 SRV |
1403 | /* Do we want to hide event format files on tracefs lockdown? */ |
1404 | ||
2a37a3df SR |
1405 | ret = seq_open(file, &trace_format_seq_ops); |
1406 | if (ret < 0) | |
1407 | return ret; | |
1408 | ||
1409 | m = file->private_data; | |
c5a44a12 | 1410 | m->private = file; |
2a37a3df SR |
1411 | |
1412 | return 0; | |
981d081e SR |
1413 | } |
1414 | ||
23725aee PZ |
1415 | static ssize_t |
1416 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1417 | { | |
1a11126b | 1418 | int id = (long)event_file_data(filp); |
cd458ba9 ON |
1419 | char buf[32]; |
1420 | int len; | |
23725aee | 1421 | |
1a11126b ON |
1422 | if (unlikely(!id)) |
1423 | return -ENODEV; | |
1424 | ||
1425 | len = sprintf(buf, "%d\n", id); | |
1426 | ||
cd458ba9 | 1427 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); |
23725aee PZ |
1428 | } |
1429 | ||
7ce7e424 TZ |
1430 | static ssize_t |
1431 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1432 | loff_t *ppos) | |
1433 | { | |
7f1d2f82 | 1434 | struct trace_event_file *file; |
7ce7e424 | 1435 | struct trace_seq *s; |
e2912b09 | 1436 | int r = -ENODEV; |
7ce7e424 TZ |
1437 | |
1438 | if (*ppos) | |
1439 | return 0; | |
1440 | ||
1441 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
e2912b09 | 1442 | |
7ce7e424 TZ |
1443 | if (!s) |
1444 | return -ENOMEM; | |
1445 | ||
1446 | trace_seq_init(s); | |
1447 | ||
e2912b09 | 1448 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1449 | file = event_file_data(filp); |
1450 | if (file) | |
1451 | print_event_filter(file, s); | |
e2912b09 ON |
1452 | mutex_unlock(&event_mutex); |
1453 | ||
f306cc82 | 1454 | if (file) |
5ac48378 SRRH |
1455 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1456 | s->buffer, trace_seq_used(s)); | |
7ce7e424 TZ |
1457 | |
1458 | kfree(s); | |
1459 | ||
1460 | return r; | |
1461 | } | |
1462 | ||
1463 | static ssize_t | |
1464 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1465 | loff_t *ppos) | |
1466 | { | |
7f1d2f82 | 1467 | struct trace_event_file *file; |
8b372562 | 1468 | char *buf; |
e2912b09 | 1469 | int err = -ENODEV; |
7ce7e424 | 1470 | |
8b372562 | 1471 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
1472 | return -EINVAL; |
1473 | ||
70f6cbb6 AV |
1474 | buf = memdup_user_nul(ubuf, cnt); |
1475 | if (IS_ERR(buf)) | |
1476 | return PTR_ERR(buf); | |
7ce7e424 | 1477 | |
e2912b09 | 1478 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1479 | file = event_file_data(filp); |
1480 | if (file) | |
1481 | err = apply_event_filter(file, buf); | |
e2912b09 ON |
1482 | mutex_unlock(&event_mutex); |
1483 | ||
70f6cbb6 | 1484 | kfree(buf); |
8b372562 | 1485 | if (err < 0) |
44e9c8b7 | 1486 | return err; |
0a19e53c | 1487 | |
7ce7e424 TZ |
1488 | *ppos += cnt; |
1489 | ||
1490 | return cnt; | |
1491 | } | |
1492 | ||
e9dbfae5 SR |
1493 | static LIST_HEAD(event_subsystems); |
1494 | ||
1495 | static int subsystem_open(struct inode *inode, struct file *filp) | |
1496 | { | |
1497 | struct event_subsystem *system = NULL; | |
7967b3e0 | 1498 | struct trace_subsystem_dir *dir = NULL; /* Initialize for gcc */ |
ae63b31e | 1499 | struct trace_array *tr; |
e9dbfae5 SR |
1500 | int ret; |
1501 | ||
d6d3523c GB |
1502 | if (tracing_is_disabled()) |
1503 | return -ENODEV; | |
1504 | ||
e9dbfae5 SR |
1505 | /* Make sure the system still exists */ |
1506 | mutex_lock(&event_mutex); | |
12ecef0c | 1507 | mutex_lock(&trace_types_lock); |
ae63b31e SR |
1508 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
1509 | list_for_each_entry(dir, &tr->systems, list) { | |
1510 | if (dir == inode->i_private) { | |
1511 | /* Don't open systems with no events */ | |
1512 | if (dir->nr_events) { | |
1513 | __get_system_dir(dir); | |
1514 | system = dir->subsystem; | |
1515 | } | |
1516 | goto exit_loop; | |
e9dbfae5 | 1517 | } |
e9dbfae5 SR |
1518 | } |
1519 | } | |
ae63b31e | 1520 | exit_loop: |
a8227415 | 1521 | mutex_unlock(&trace_types_lock); |
12ecef0c | 1522 | mutex_unlock(&event_mutex); |
e9dbfae5 | 1523 | |
ae63b31e | 1524 | if (!system) |
e9dbfae5 SR |
1525 | return -ENODEV; |
1526 | ||
ae63b31e SR |
1527 | /* Some versions of gcc think dir can be uninitialized here */ |
1528 | WARN_ON(!dir); | |
1529 | ||
8e2e2fa4 SRRH |
1530 | /* Still need to increment the ref count of the system */ |
1531 | if (trace_array_get(tr) < 0) { | |
1532 | put_system(dir); | |
1533 | return -ENODEV; | |
1534 | } | |
1535 | ||
e9dbfae5 | 1536 | ret = tracing_open_generic(inode, filp); |
8e2e2fa4 SRRH |
1537 | if (ret < 0) { |
1538 | trace_array_put(tr); | |
ae63b31e | 1539 | put_system(dir); |
8e2e2fa4 | 1540 | } |
ae63b31e SR |
1541 | |
1542 | return ret; | |
1543 | } | |
1544 | ||
1545 | static int system_tr_open(struct inode *inode, struct file *filp) | |
1546 | { | |
7967b3e0 | 1547 | struct trace_subsystem_dir *dir; |
ae63b31e SR |
1548 | struct trace_array *tr = inode->i_private; |
1549 | int ret; | |
1550 | ||
1551 | /* Make a temporary dir that has no system but points to tr */ | |
1552 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); | |
aa07d71f | 1553 | if (!dir) |
ae63b31e | 1554 | return -ENOMEM; |
ae63b31e | 1555 | |
aa07d71f | 1556 | ret = tracing_open_generic_tr(inode, filp); |
8e2e2fa4 | 1557 | if (ret < 0) { |
ae63b31e | 1558 | kfree(dir); |
d6d3523c | 1559 | return ret; |
8e2e2fa4 | 1560 | } |
aa07d71f | 1561 | dir->tr = tr; |
ae63b31e | 1562 | filp->private_data = dir; |
e9dbfae5 | 1563 | |
d6d3523c | 1564 | return 0; |
e9dbfae5 SR |
1565 | } |
1566 | ||
1567 | static int subsystem_release(struct inode *inode, struct file *file) | |
1568 | { | |
7967b3e0 | 1569 | struct trace_subsystem_dir *dir = file->private_data; |
e9dbfae5 | 1570 | |
8e2e2fa4 SRRH |
1571 | trace_array_put(dir->tr); |
1572 | ||
ae63b31e SR |
1573 | /* |
1574 | * If dir->subsystem is NULL, then this is a temporary | |
1575 | * descriptor that was made for a trace_array to enable | |
1576 | * all subsystems. | |
1577 | */ | |
1578 | if (dir->subsystem) | |
1579 | put_system(dir); | |
1580 | else | |
1581 | kfree(dir); | |
e9dbfae5 SR |
1582 | |
1583 | return 0; | |
1584 | } | |
1585 | ||
cfb180f3 TZ |
1586 | static ssize_t |
1587 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1588 | loff_t *ppos) | |
1589 | { | |
7967b3e0 | 1590 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1591 | struct event_subsystem *system = dir->subsystem; |
cfb180f3 TZ |
1592 | struct trace_seq *s; |
1593 | int r; | |
1594 | ||
1595 | if (*ppos) | |
1596 | return 0; | |
1597 | ||
1598 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1599 | if (!s) | |
1600 | return -ENOMEM; | |
1601 | ||
1602 | trace_seq_init(s); | |
1603 | ||
8b372562 | 1604 | print_subsystem_event_filter(system, s); |
5ac48378 SRRH |
1605 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1606 | s->buffer, trace_seq_used(s)); | |
cfb180f3 TZ |
1607 | |
1608 | kfree(s); | |
1609 | ||
1610 | return r; | |
1611 | } | |
1612 | ||
1613 | static ssize_t | |
1614 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1615 | loff_t *ppos) | |
1616 | { | |
7967b3e0 | 1617 | struct trace_subsystem_dir *dir = filp->private_data; |
8b372562 | 1618 | char *buf; |
cfb180f3 TZ |
1619 | int err; |
1620 | ||
8b372562 | 1621 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
1622 | return -EINVAL; |
1623 | ||
70f6cbb6 AV |
1624 | buf = memdup_user_nul(ubuf, cnt); |
1625 | if (IS_ERR(buf)) | |
1626 | return PTR_ERR(buf); | |
cfb180f3 | 1627 | |
ae63b31e | 1628 | err = apply_subsystem_event_filter(dir, buf); |
70f6cbb6 | 1629 | kfree(buf); |
8b372562 | 1630 | if (err < 0) |
44e9c8b7 | 1631 | return err; |
cfb180f3 TZ |
1632 | |
1633 | *ppos += cnt; | |
1634 | ||
1635 | return cnt; | |
1636 | } | |
1637 | ||
d1b182a8 SR |
1638 | static ssize_t |
1639 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1640 | { | |
1641 | int (*func)(struct trace_seq *s) = filp->private_data; | |
1642 | struct trace_seq *s; | |
1643 | int r; | |
1644 | ||
1645 | if (*ppos) | |
1646 | return 0; | |
1647 | ||
1648 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1649 | if (!s) | |
1650 | return -ENOMEM; | |
1651 | ||
1652 | trace_seq_init(s); | |
1653 | ||
1654 | func(s); | |
5ac48378 SRRH |
1655 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1656 | s->buffer, trace_seq_used(s)); | |
d1b182a8 SR |
1657 | |
1658 | kfree(s); | |
1659 | ||
1660 | return r; | |
1661 | } | |
1662 | ||
8ca532ad SRRH |
1663 | static void ignore_task_cpu(void *data) |
1664 | { | |
1665 | struct trace_array *tr = data; | |
1666 | struct trace_pid_list *pid_list; | |
27683626 | 1667 | struct trace_pid_list *no_pid_list; |
8ca532ad SRRH |
1668 | |
1669 | /* | |
1670 | * This function is called by on_each_cpu() while the | |
1671 | * event_mutex is held. | |
1672 | */ | |
1673 | pid_list = rcu_dereference_protected(tr->filtered_pids, | |
1674 | mutex_is_locked(&event_mutex)); | |
27683626 SRV |
1675 | no_pid_list = rcu_dereference_protected(tr->filtered_no_pids, |
1676 | mutex_is_locked(&event_mutex)); | |
8ca532ad | 1677 | |
1c5eb448 | 1678 | this_cpu_write(tr->array_buffer.data->ignore_pid, |
27683626 SRV |
1679 | trace_ignore_this_task(pid_list, no_pid_list, current)); |
1680 | } | |
1681 | ||
1682 | static void register_pid_events(struct trace_array *tr) | |
1683 | { | |
1684 | /* | |
1685 | * Register a probe that is called before all other probes | |
1686 | * to set ignore_pid if next or prev do not match. | |
1687 | * Register a probe this is called after all other probes | |
1688 | * to only keep ignore_pid set if next pid matches. | |
1689 | */ | |
1690 | register_trace_prio_sched_switch(event_filter_pid_sched_switch_probe_pre, | |
1691 | tr, INT_MAX); | |
1692 | register_trace_prio_sched_switch(event_filter_pid_sched_switch_probe_post, | |
1693 | tr, 0); | |
1694 | ||
1695 | register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_pre, | |
1696 | tr, INT_MAX); | |
1697 | register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_post, | |
1698 | tr, 0); | |
1699 | ||
1700 | register_trace_prio_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_pre, | |
1701 | tr, INT_MAX); | |
1702 | register_trace_prio_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_post, | |
1703 | tr, 0); | |
1704 | ||
1705 | register_trace_prio_sched_waking(event_filter_pid_sched_wakeup_probe_pre, | |
1706 | tr, INT_MAX); | |
1707 | register_trace_prio_sched_waking(event_filter_pid_sched_wakeup_probe_post, | |
1708 | tr, 0); | |
8ca532ad SRRH |
1709 | } |
1710 | ||
49090107 | 1711 | static ssize_t |
27683626 SRV |
1712 | event_pid_write(struct file *filp, const char __user *ubuf, |
1713 | size_t cnt, loff_t *ppos, int type) | |
49090107 | 1714 | { |
3fdaf80f | 1715 | struct seq_file *m = filp->private_data; |
49090107 SRRH |
1716 | struct trace_array *tr = m->private; |
1717 | struct trace_pid_list *filtered_pids = NULL; | |
27683626 | 1718 | struct trace_pid_list *other_pids = NULL; |
f4d34a87 | 1719 | struct trace_pid_list *pid_list; |
3fdaf80f | 1720 | struct trace_event_file *file; |
76c813e2 | 1721 | ssize_t ret; |
49090107 SRRH |
1722 | |
1723 | if (!cnt) | |
1724 | return 0; | |
1725 | ||
1726 | ret = tracing_update_buffers(); | |
1727 | if (ret < 0) | |
1728 | return ret; | |
1729 | ||
49090107 | 1730 | mutex_lock(&event_mutex); |
76c813e2 | 1731 | |
27683626 SRV |
1732 | if (type == TRACE_PIDS) { |
1733 | filtered_pids = rcu_dereference_protected(tr->filtered_pids, | |
1734 | lockdep_is_held(&event_mutex)); | |
1735 | other_pids = rcu_dereference_protected(tr->filtered_no_pids, | |
1736 | lockdep_is_held(&event_mutex)); | |
1737 | } else { | |
1738 | filtered_pids = rcu_dereference_protected(tr->filtered_no_pids, | |
1739 | lockdep_is_held(&event_mutex)); | |
1740 | other_pids = rcu_dereference_protected(tr->filtered_pids, | |
1741 | lockdep_is_held(&event_mutex)); | |
1742 | } | |
f4d34a87 | 1743 | |
76c813e2 SRRH |
1744 | ret = trace_pid_write(filtered_pids, &pid_list, ubuf, cnt); |
1745 | if (ret < 0) | |
f4d34a87 | 1746 | goto out; |
49090107 | 1747 | |
27683626 SRV |
1748 | if (type == TRACE_PIDS) |
1749 | rcu_assign_pointer(tr->filtered_pids, pid_list); | |
1750 | else | |
1751 | rcu_assign_pointer(tr->filtered_no_pids, pid_list); | |
49090107 | 1752 | |
3fdaf80f SRRH |
1753 | list_for_each_entry(file, &tr->events, list) { |
1754 | set_bit(EVENT_FILE_FL_PID_FILTER_BIT, &file->flags); | |
1755 | } | |
49090107 SRRH |
1756 | |
1757 | if (filtered_pids) { | |
e0a568dc | 1758 | tracepoint_synchronize_unregister(); |
76c813e2 | 1759 | trace_free_pid_list(filtered_pids); |
27683626 SRV |
1760 | } else if (pid_list && !other_pids) { |
1761 | register_pid_events(tr); | |
49090107 SRRH |
1762 | } |
1763 | ||
799fd44c SRRH |
1764 | /* |
1765 | * Ignoring of pids is done at task switch. But we have to | |
1766 | * check for those tasks that are currently running. | |
1767 | * Always do this in case a pid was appended or removed. | |
1768 | */ | |
1769 | on_each_cpu(ignore_task_cpu, tr, 1); | |
1770 | ||
f4d34a87 | 1771 | out: |
3fdaf80f SRRH |
1772 | mutex_unlock(&event_mutex); |
1773 | ||
76c813e2 SRRH |
1774 | if (ret > 0) |
1775 | *ppos += ret; | |
49090107 SRRH |
1776 | |
1777 | return ret; | |
1778 | } | |
1779 | ||
27683626 SRV |
1780 | static ssize_t |
1781 | ftrace_event_pid_write(struct file *filp, const char __user *ubuf, | |
1782 | size_t cnt, loff_t *ppos) | |
1783 | { | |
1784 | return event_pid_write(filp, ubuf, cnt, ppos, TRACE_PIDS); | |
1785 | } | |
1786 | ||
1787 | static ssize_t | |
1788 | ftrace_event_npid_write(struct file *filp, const char __user *ubuf, | |
1789 | size_t cnt, loff_t *ppos) | |
1790 | { | |
1791 | return event_pid_write(filp, ubuf, cnt, ppos, TRACE_NO_PIDS); | |
1792 | } | |
1793 | ||
15075cac SR |
1794 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
1795 | static int ftrace_event_set_open(struct inode *inode, struct file *file); | |
49090107 | 1796 | static int ftrace_event_set_pid_open(struct inode *inode, struct file *file); |
27683626 | 1797 | static int ftrace_event_set_npid_open(struct inode *inode, struct file *file); |
f77d09a3 | 1798 | static int ftrace_event_release(struct inode *inode, struct file *file); |
15075cac | 1799 | |
b77e38aa SR |
1800 | static const struct seq_operations show_event_seq_ops = { |
1801 | .start = t_start, | |
1802 | .next = t_next, | |
1803 | .show = t_show, | |
1804 | .stop = t_stop, | |
1805 | }; | |
1806 | ||
1807 | static const struct seq_operations show_set_event_seq_ops = { | |
1808 | .start = s_start, | |
1809 | .next = s_next, | |
1810 | .show = t_show, | |
1811 | .stop = t_stop, | |
1812 | }; | |
1813 | ||
49090107 SRRH |
1814 | static const struct seq_operations show_set_pid_seq_ops = { |
1815 | .start = p_start, | |
1816 | .next = p_next, | |
5cc8976b | 1817 | .show = trace_pid_show, |
49090107 SRRH |
1818 | .stop = p_stop, |
1819 | }; | |
1820 | ||
27683626 SRV |
1821 | static const struct seq_operations show_set_no_pid_seq_ops = { |
1822 | .start = np_start, | |
1823 | .next = np_next, | |
1824 | .show = trace_pid_show, | |
1825 | .stop = p_stop, | |
1826 | }; | |
1827 | ||
2314c4ae | 1828 | static const struct file_operations ftrace_avail_fops = { |
15075cac | 1829 | .open = ftrace_event_avail_open, |
2314c4ae SR |
1830 | .read = seq_read, |
1831 | .llseek = seq_lseek, | |
1832 | .release = seq_release, | |
1833 | }; | |
1834 | ||
b77e38aa | 1835 | static const struct file_operations ftrace_set_event_fops = { |
15075cac | 1836 | .open = ftrace_event_set_open, |
b77e38aa SR |
1837 | .read = seq_read, |
1838 | .write = ftrace_event_write, | |
1839 | .llseek = seq_lseek, | |
f77d09a3 | 1840 | .release = ftrace_event_release, |
b77e38aa SR |
1841 | }; |
1842 | ||
49090107 SRRH |
1843 | static const struct file_operations ftrace_set_event_pid_fops = { |
1844 | .open = ftrace_event_set_pid_open, | |
1845 | .read = seq_read, | |
1846 | .write = ftrace_event_pid_write, | |
1847 | .llseek = seq_lseek, | |
1848 | .release = ftrace_event_release, | |
1849 | }; | |
1850 | ||
27683626 SRV |
1851 | static const struct file_operations ftrace_set_event_notrace_pid_fops = { |
1852 | .open = ftrace_event_set_npid_open, | |
1853 | .read = seq_read, | |
1854 | .write = ftrace_event_npid_write, | |
1855 | .llseek = seq_lseek, | |
1856 | .release = ftrace_event_release, | |
1857 | }; | |
1858 | ||
1473e441 | 1859 | static const struct file_operations ftrace_enable_fops = { |
bf682c31 | 1860 | .open = tracing_open_generic, |
1473e441 SR |
1861 | .read = event_enable_read, |
1862 | .write = event_enable_write, | |
6038f373 | 1863 | .llseek = default_llseek, |
1473e441 SR |
1864 | }; |
1865 | ||
981d081e | 1866 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
1867 | .open = trace_format_open, |
1868 | .read = seq_read, | |
1869 | .llseek = seq_lseek, | |
1870 | .release = seq_release, | |
981d081e SR |
1871 | }; |
1872 | ||
23725aee | 1873 | static const struct file_operations ftrace_event_id_fops = { |
23725aee | 1874 | .read = event_id_read, |
6038f373 | 1875 | .llseek = default_llseek, |
23725aee PZ |
1876 | }; |
1877 | ||
7ce7e424 TZ |
1878 | static const struct file_operations ftrace_event_filter_fops = { |
1879 | .open = tracing_open_generic, | |
1880 | .read = event_filter_read, | |
1881 | .write = event_filter_write, | |
6038f373 | 1882 | .llseek = default_llseek, |
7ce7e424 TZ |
1883 | }; |
1884 | ||
cfb180f3 | 1885 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 1886 | .open = subsystem_open, |
cfb180f3 TZ |
1887 | .read = subsystem_filter_read, |
1888 | .write = subsystem_filter_write, | |
6038f373 | 1889 | .llseek = default_llseek, |
e9dbfae5 | 1890 | .release = subsystem_release, |
cfb180f3 TZ |
1891 | }; |
1892 | ||
8ae79a13 | 1893 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 1894 | .open = subsystem_open, |
8ae79a13 SR |
1895 | .read = system_enable_read, |
1896 | .write = system_enable_write, | |
6038f373 | 1897 | .llseek = default_llseek, |
40ee4dff | 1898 | .release = subsystem_release, |
8ae79a13 SR |
1899 | }; |
1900 | ||
ae63b31e SR |
1901 | static const struct file_operations ftrace_tr_enable_fops = { |
1902 | .open = system_tr_open, | |
1903 | .read = system_enable_read, | |
1904 | .write = system_enable_write, | |
1905 | .llseek = default_llseek, | |
1906 | .release = subsystem_release, | |
1907 | }; | |
1908 | ||
d1b182a8 SR |
1909 | static const struct file_operations ftrace_show_header_fops = { |
1910 | .open = tracing_open_generic, | |
1911 | .read = show_header, | |
6038f373 | 1912 | .llseek = default_llseek, |
d1b182a8 SR |
1913 | }; |
1914 | ||
ae63b31e SR |
1915 | static int |
1916 | ftrace_event_open(struct inode *inode, struct file *file, | |
1917 | const struct seq_operations *seq_ops) | |
1473e441 | 1918 | { |
ae63b31e SR |
1919 | struct seq_file *m; |
1920 | int ret; | |
1473e441 | 1921 | |
17911ff3 SRV |
1922 | ret = security_locked_down(LOCKDOWN_TRACEFS); |
1923 | if (ret) | |
1924 | return ret; | |
1925 | ||
ae63b31e SR |
1926 | ret = seq_open(file, seq_ops); |
1927 | if (ret < 0) | |
1928 | return ret; | |
1929 | m = file->private_data; | |
1930 | /* copy tr over to seq ops */ | |
1931 | m->private = inode->i_private; | |
1473e441 | 1932 | |
ae63b31e | 1933 | return ret; |
1473e441 SR |
1934 | } |
1935 | ||
f77d09a3 AL |
1936 | static int ftrace_event_release(struct inode *inode, struct file *file) |
1937 | { | |
1938 | struct trace_array *tr = inode->i_private; | |
1939 | ||
1940 | trace_array_put(tr); | |
1941 | ||
1942 | return seq_release(inode, file); | |
1943 | } | |
1944 | ||
15075cac SR |
1945 | static int |
1946 | ftrace_event_avail_open(struct inode *inode, struct file *file) | |
1947 | { | |
1948 | const struct seq_operations *seq_ops = &show_event_seq_ops; | |
1949 | ||
17911ff3 | 1950 | /* Checks for tracefs lockdown */ |
ae63b31e | 1951 | return ftrace_event_open(inode, file, seq_ops); |
15075cac SR |
1952 | } |
1953 | ||
1954 | static int | |
1955 | ftrace_event_set_open(struct inode *inode, struct file *file) | |
1956 | { | |
1957 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; | |
ae63b31e | 1958 | struct trace_array *tr = inode->i_private; |
f77d09a3 AL |
1959 | int ret; |
1960 | ||
8530dec6 SRV |
1961 | ret = tracing_check_open_get_tr(tr); |
1962 | if (ret) | |
1963 | return ret; | |
15075cac SR |
1964 | |
1965 | if ((file->f_mode & FMODE_WRITE) && | |
1966 | (file->f_flags & O_TRUNC)) | |
ae63b31e | 1967 | ftrace_clear_events(tr); |
15075cac | 1968 | |
f77d09a3 AL |
1969 | ret = ftrace_event_open(inode, file, seq_ops); |
1970 | if (ret < 0) | |
1971 | trace_array_put(tr); | |
1972 | return ret; | |
ae63b31e SR |
1973 | } |
1974 | ||
49090107 SRRH |
1975 | static int |
1976 | ftrace_event_set_pid_open(struct inode *inode, struct file *file) | |
1977 | { | |
1978 | const struct seq_operations *seq_ops = &show_set_pid_seq_ops; | |
1979 | struct trace_array *tr = inode->i_private; | |
1980 | int ret; | |
1981 | ||
8530dec6 SRV |
1982 | ret = tracing_check_open_get_tr(tr); |
1983 | if (ret) | |
1984 | return ret; | |
49090107 SRRH |
1985 | |
1986 | if ((file->f_mode & FMODE_WRITE) && | |
1987 | (file->f_flags & O_TRUNC)) | |
27683626 SRV |
1988 | ftrace_clear_event_pids(tr, TRACE_PIDS); |
1989 | ||
1990 | ret = ftrace_event_open(inode, file, seq_ops); | |
1991 | if (ret < 0) | |
1992 | trace_array_put(tr); | |
1993 | return ret; | |
1994 | } | |
1995 | ||
1996 | static int | |
1997 | ftrace_event_set_npid_open(struct inode *inode, struct file *file) | |
1998 | { | |
1999 | const struct seq_operations *seq_ops = &show_set_no_pid_seq_ops; | |
2000 | struct trace_array *tr = inode->i_private; | |
2001 | int ret; | |
2002 | ||
2003 | ret = tracing_check_open_get_tr(tr); | |
2004 | if (ret) | |
2005 | return ret; | |
2006 | ||
2007 | if ((file->f_mode & FMODE_WRITE) && | |
2008 | (file->f_flags & O_TRUNC)) | |
2009 | ftrace_clear_event_pids(tr, TRACE_NO_PIDS); | |
49090107 SRRH |
2010 | |
2011 | ret = ftrace_event_open(inode, file, seq_ops); | |
2012 | if (ret < 0) | |
2013 | trace_array_put(tr); | |
2014 | return ret; | |
2015 | } | |
2016 | ||
ae63b31e SR |
2017 | static struct event_subsystem * |
2018 | create_new_subsystem(const char *name) | |
2019 | { | |
2020 | struct event_subsystem *system; | |
2021 | ||
2022 | /* need to create new entry */ | |
2023 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
2024 | if (!system) | |
2025 | return NULL; | |
2026 | ||
2027 | system->ref_count = 1; | |
6e94a780 SR |
2028 | |
2029 | /* Only allocate if dynamic (kprobes and modules) */ | |
79ac6ef5 RV |
2030 | system->name = kstrdup_const(name, GFP_KERNEL); |
2031 | if (!system->name) | |
2032 | goto out_free; | |
ae63b31e SR |
2033 | |
2034 | system->filter = NULL; | |
2035 | ||
2036 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); | |
2037 | if (!system->filter) | |
2038 | goto out_free; | |
2039 | ||
2040 | list_add(&system->list, &event_subsystems); | |
2041 | ||
2042 | return system; | |
2043 | ||
2044 | out_free: | |
79ac6ef5 | 2045 | kfree_const(system->name); |
ae63b31e SR |
2046 | kfree(system); |
2047 | return NULL; | |
15075cac SR |
2048 | } |
2049 | ||
6ecc2d1c | 2050 | static struct dentry * |
ae63b31e | 2051 | event_subsystem_dir(struct trace_array *tr, const char *name, |
7f1d2f82 | 2052 | struct trace_event_file *file, struct dentry *parent) |
6ecc2d1c | 2053 | { |
7967b3e0 | 2054 | struct trace_subsystem_dir *dir; |
6ecc2d1c | 2055 | struct event_subsystem *system; |
e1112b4d | 2056 | struct dentry *entry; |
6ecc2d1c SR |
2057 | |
2058 | /* First see if we did not already create this dir */ | |
ae63b31e SR |
2059 | list_for_each_entry(dir, &tr->systems, list) { |
2060 | system = dir->subsystem; | |
dc82ec98 | 2061 | if (strcmp(system->name, name) == 0) { |
ae63b31e SR |
2062 | dir->nr_events++; |
2063 | file->system = dir; | |
2064 | return dir->entry; | |
dc82ec98 | 2065 | } |
6ecc2d1c SR |
2066 | } |
2067 | ||
ae63b31e SR |
2068 | /* Now see if the system itself exists. */ |
2069 | list_for_each_entry(system, &event_subsystems, list) { | |
2070 | if (strcmp(system->name, name) == 0) | |
2071 | break; | |
6ecc2d1c | 2072 | } |
ae63b31e SR |
2073 | /* Reset system variable when not found */ |
2074 | if (&system->list == &event_subsystems) | |
2075 | system = NULL; | |
6ecc2d1c | 2076 | |
ae63b31e SR |
2077 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
2078 | if (!dir) | |
2079 | goto out_fail; | |
6ecc2d1c | 2080 | |
ae63b31e SR |
2081 | if (!system) { |
2082 | system = create_new_subsystem(name); | |
2083 | if (!system) | |
2084 | goto out_free; | |
2085 | } else | |
2086 | __get_system(system); | |
2087 | ||
8434dc93 | 2088 | dir->entry = tracefs_create_dir(name, parent); |
ae63b31e | 2089 | if (!dir->entry) { |
3448bac3 | 2090 | pr_warn("Failed to create system directory %s\n", name); |
ae63b31e SR |
2091 | __put_system(system); |
2092 | goto out_free; | |
6d723736 SR |
2093 | } |
2094 | ||
ae63b31e SR |
2095 | dir->tr = tr; |
2096 | dir->ref_count = 1; | |
2097 | dir->nr_events = 1; | |
2098 | dir->subsystem = system; | |
2099 | file->system = dir; | |
8b372562 | 2100 | |
2d396cb3 SRV |
2101 | /* the ftrace system is special, do not create enable or filter files */ |
2102 | if (strcmp(name, "ftrace") != 0) { | |
e1112b4d | 2103 | |
2d396cb3 SRV |
2104 | entry = tracefs_create_file("filter", 0644, dir->entry, dir, |
2105 | &ftrace_subsystem_filter_fops); | |
2106 | if (!entry) { | |
2107 | kfree(system->filter); | |
2108 | system->filter = NULL; | |
2109 | pr_warn("Could not create tracefs '%s/filter' entry\n", name); | |
2110 | } | |
e1112b4d | 2111 | |
2d396cb3 SRV |
2112 | trace_create_file("enable", 0644, dir->entry, dir, |
2113 | &ftrace_system_enable_fops); | |
2114 | } | |
8ae79a13 | 2115 | |
ae63b31e SR |
2116 | list_add(&dir->list, &tr->systems); |
2117 | ||
2118 | return dir->entry; | |
2119 | ||
2120 | out_free: | |
2121 | kfree(dir); | |
2122 | out_fail: | |
2123 | /* Only print this message if failed on memory allocation */ | |
2124 | if (!dir || !system) | |
3448bac3 | 2125 | pr_warn("No memory to create event subsystem %s\n", name); |
ae63b31e | 2126 | return NULL; |
6ecc2d1c SR |
2127 | } |
2128 | ||
ac343da7 MH |
2129 | static int |
2130 | event_define_fields(struct trace_event_call *call) | |
2131 | { | |
2132 | struct list_head *head; | |
2133 | int ret = 0; | |
2134 | ||
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 | struct trace_event_fields *field = call->class->fields_array; | |
2142 | unsigned int offset = sizeof(struct trace_entry); | |
2143 | ||
2144 | for (; field->type; field++) { | |
2145 | if (field->type == TRACE_FUNCTION_TYPE) { | |
2146 | field->define_fields(call); | |
2147 | break; | |
2148 | } | |
2149 | ||
2150 | offset = ALIGN(offset, field->align); | |
2151 | ret = trace_define_field(call, field->type, field->name, | |
2152 | offset, field->size, | |
2153 | field->is_signed, field->filter_type); | |
2154 | if (WARN_ON_ONCE(ret)) { | |
2155 | pr_err("error code is %d\n", ret); | |
2156 | break; | |
2157 | } | |
2158 | ||
2159 | offset += field->size; | |
2160 | } | |
2161 | } | |
2162 | ||
2163 | return ret; | |
2164 | } | |
2165 | ||
1473e441 | 2166 | static int |
7f1d2f82 | 2167 | event_create_dir(struct dentry *parent, struct trace_event_file *file) |
1473e441 | 2168 | { |
2425bcb9 | 2169 | struct trace_event_call *call = file->event_call; |
ae63b31e | 2170 | struct trace_array *tr = file->tr; |
ae63b31e | 2171 | struct dentry *d_events; |
de7b2973 | 2172 | const char *name; |
fd994989 | 2173 | int ret; |
1473e441 | 2174 | |
6ecc2d1c SR |
2175 | /* |
2176 | * If the trace point header did not define TRACE_SYSTEM | |
2177 | * then the system would be called "TRACE_SYSTEM". | |
2178 | */ | |
ae63b31e SR |
2179 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { |
2180 | d_events = event_subsystem_dir(tr, call->class->system, file, parent); | |
2181 | if (!d_events) | |
2182 | return -ENOMEM; | |
2183 | } else | |
2184 | d_events = parent; | |
2185 | ||
687fcc4a | 2186 | name = trace_event_name(call); |
8434dc93 | 2187 | file->dir = tracefs_create_dir(name, d_events); |
ae63b31e | 2188 | if (!file->dir) { |
8434dc93 | 2189 | pr_warn("Could not create tracefs '%s' directory\n", name); |
1473e441 SR |
2190 | return -1; |
2191 | } | |
2192 | ||
9b63776f | 2193 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
ae63b31e | 2194 | trace_create_file("enable", 0644, file->dir, file, |
620a30e9 | 2195 | &ftrace_enable_fops); |
1473e441 | 2196 | |
2239291a | 2197 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 2198 | if (call->event.type && call->class->reg) |
1a11126b | 2199 | trace_create_file("id", 0444, file->dir, |
620a30e9 ON |
2200 | (void *)(long)call->event.type, |
2201 | &ftrace_event_id_fops); | |
2239291a | 2202 | #endif |
23725aee | 2203 | |
ac343da7 MH |
2204 | ret = event_define_fields(call); |
2205 | if (ret < 0) { | |
2206 | pr_warn("Could not initialize trace point events/%s\n", name); | |
2207 | return ret; | |
cf027f64 TZ |
2208 | } |
2209 | ||
854145e0 CH |
2210 | /* |
2211 | * Only event directories that can be enabled should have | |
5d948c86 | 2212 | * triggers or filters. |
854145e0 | 2213 | */ |
5d948c86 SRV |
2214 | if (!(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) { |
2215 | trace_create_file("filter", 0644, file->dir, file, | |
2216 | &ftrace_event_filter_fops); | |
2217 | ||
854145e0 CH |
2218 | trace_create_file("trigger", 0644, file->dir, file, |
2219 | &event_trigger_fops); | |
5d948c86 | 2220 | } |
85f2b082 | 2221 | |
7ef224d1 TZ |
2222 | #ifdef CONFIG_HIST_TRIGGERS |
2223 | trace_create_file("hist", 0444, file->dir, file, | |
2224 | &event_hist_fops); | |
2d19bd79 TZ |
2225 | #endif |
2226 | #ifdef CONFIG_HIST_TRIGGERS_DEBUG | |
2227 | trace_create_file("hist_debug", 0444, file->dir, file, | |
2228 | &event_hist_debug_fops); | |
7ef224d1 | 2229 | #endif |
ae63b31e | 2230 | trace_create_file("format", 0444, file->dir, call, |
620a30e9 | 2231 | &ftrace_event_format_fops); |
6d723736 | 2232 | |
6c3edaf9 CW |
2233 | #ifdef CONFIG_TRACE_EVENT_INJECT |
2234 | if (call->event.type && call->class->reg) | |
2235 | trace_create_file("inject", 0200, file->dir, file, | |
2236 | &event_inject_fops); | |
2237 | #endif | |
2238 | ||
6d723736 SR |
2239 | return 0; |
2240 | } | |
2241 | ||
2425bcb9 | 2242 | static void remove_event_from_tracers(struct trace_event_call *call) |
ae63b31e | 2243 | { |
7f1d2f82 | 2244 | struct trace_event_file *file; |
ae63b31e SR |
2245 | struct trace_array *tr; |
2246 | ||
2247 | do_for_each_event_file_safe(tr, file) { | |
ae63b31e SR |
2248 | if (file->event_call != call) |
2249 | continue; | |
2250 | ||
f6a84bdc | 2251 | remove_event_file_dir(file); |
ae63b31e SR |
2252 | /* |
2253 | * The do_for_each_event_file_safe() is | |
2254 | * a double loop. After finding the call for this | |
2255 | * trace_array, we use break to jump to the next | |
2256 | * trace_array. | |
2257 | */ | |
2258 | break; | |
2259 | } while_for_each_event_file(); | |
2260 | } | |
2261 | ||
2425bcb9 | 2262 | static void event_remove(struct trace_event_call *call) |
8781915a | 2263 | { |
ae63b31e | 2264 | struct trace_array *tr; |
7f1d2f82 | 2265 | struct trace_event_file *file; |
ae63b31e SR |
2266 | |
2267 | do_for_each_event_file(tr, file) { | |
2268 | if (file->event_call != call) | |
2269 | continue; | |
065e63f9 SRV |
2270 | |
2271 | if (file->flags & EVENT_FILE_FL_WAS_ENABLED) | |
2272 | tr->clear_trace = true; | |
2273 | ||
ae63b31e SR |
2274 | ftrace_event_enable_disable(file, 0); |
2275 | /* | |
2276 | * The do_for_each_event_file() is | |
2277 | * a double loop. After finding the call for this | |
2278 | * trace_array, we use break to jump to the next | |
2279 | * trace_array. | |
2280 | */ | |
2281 | break; | |
2282 | } while_for_each_event_file(); | |
2283 | ||
8781915a | 2284 | if (call->event.funcs) |
9023c930 | 2285 | __unregister_trace_event(&call->event); |
ae63b31e | 2286 | remove_event_from_tracers(call); |
8781915a EG |
2287 | list_del(&call->list); |
2288 | } | |
2289 | ||
2425bcb9 | 2290 | static int event_init(struct trace_event_call *call) |
8781915a EG |
2291 | { |
2292 | int ret = 0; | |
de7b2973 | 2293 | const char *name; |
8781915a | 2294 | |
687fcc4a | 2295 | name = trace_event_name(call); |
de7b2973 | 2296 | if (WARN_ON(!name)) |
8781915a EG |
2297 | return -EINVAL; |
2298 | ||
2299 | if (call->class->raw_init) { | |
2300 | ret = call->class->raw_init(call); | |
2301 | if (ret < 0 && ret != -ENOSYS) | |
3448bac3 | 2302 | pr_warn("Could not initialize trace events/%s\n", name); |
8781915a EG |
2303 | } |
2304 | ||
2305 | return ret; | |
2306 | } | |
2307 | ||
67ead0a6 | 2308 | static int |
2425bcb9 | 2309 | __register_event(struct trace_event_call *call, struct module *mod) |
bd1a5c84 | 2310 | { |
bd1a5c84 | 2311 | int ret; |
6d723736 | 2312 | |
8781915a EG |
2313 | ret = event_init(call); |
2314 | if (ret < 0) | |
2315 | return ret; | |
701970b3 | 2316 | |
ae63b31e | 2317 | list_add(&call->list, &ftrace_events); |
67ead0a6 | 2318 | call->mod = mod; |
88f70d75 | 2319 | |
ae63b31e | 2320 | return 0; |
bd1a5c84 MH |
2321 | } |
2322 | ||
67ec0d85 | 2323 | static char *eval_replace(char *ptr, struct trace_eval_map *map, int len) |
0c564a53 SRRH |
2324 | { |
2325 | int rlen; | |
2326 | int elen; | |
2327 | ||
67ec0d85 | 2328 | /* Find the length of the eval value as a string */ |
00f4b652 | 2329 | elen = snprintf(ptr, 0, "%ld", map->eval_value); |
0c564a53 SRRH |
2330 | /* Make sure there's enough room to replace the string with the value */ |
2331 | if (len < elen) | |
2332 | return NULL; | |
2333 | ||
00f4b652 | 2334 | snprintf(ptr, elen + 1, "%ld", map->eval_value); |
0c564a53 SRRH |
2335 | |
2336 | /* Get the rest of the string of ptr */ | |
2337 | rlen = strlen(ptr + len); | |
2338 | memmove(ptr + elen, ptr + len, rlen); | |
2339 | /* Make sure we end the new string */ | |
2340 | ptr[elen + rlen] = 0; | |
2341 | ||
2342 | return ptr + elen; | |
2343 | } | |
2344 | ||
2425bcb9 | 2345 | static void update_event_printk(struct trace_event_call *call, |
00f4b652 | 2346 | struct trace_eval_map *map) |
0c564a53 SRRH |
2347 | { |
2348 | char *ptr; | |
2349 | int quote = 0; | |
00f4b652 | 2350 | int len = strlen(map->eval_string); |
0c564a53 SRRH |
2351 | |
2352 | for (ptr = call->print_fmt; *ptr; ptr++) { | |
2353 | if (*ptr == '\\') { | |
2354 | ptr++; | |
2355 | /* paranoid */ | |
2356 | if (!*ptr) | |
2357 | break; | |
2358 | continue; | |
2359 | } | |
2360 | if (*ptr == '"') { | |
2361 | quote ^= 1; | |
2362 | continue; | |
2363 | } | |
2364 | if (quote) | |
2365 | continue; | |
2366 | if (isdigit(*ptr)) { | |
2367 | /* skip numbers */ | |
2368 | do { | |
2369 | ptr++; | |
2370 | /* Check for alpha chars like ULL */ | |
2371 | } while (isalnum(*ptr)); | |
3193899d SRRH |
2372 | if (!*ptr) |
2373 | break; | |
0c564a53 SRRH |
2374 | /* |
2375 | * A number must have some kind of delimiter after | |
2376 | * it, and we can ignore that too. | |
2377 | */ | |
2378 | continue; | |
2379 | } | |
2380 | if (isalpha(*ptr) || *ptr == '_') { | |
00f4b652 | 2381 | if (strncmp(map->eval_string, ptr, len) == 0 && |
0c564a53 | 2382 | !isalnum(ptr[len]) && ptr[len] != '_') { |
67ec0d85 JL |
2383 | ptr = eval_replace(ptr, map, len); |
2384 | /* enum/sizeof string smaller than value */ | |
0c564a53 SRRH |
2385 | if (WARN_ON_ONCE(!ptr)) |
2386 | return; | |
2387 | /* | |
67ec0d85 | 2388 | * No need to decrement here, as eval_replace() |
0c564a53 | 2389 | * returns the pointer to the character passed |
67ec0d85 | 2390 | * the eval, and two evals can not be placed |
0c564a53 SRRH |
2391 | * back to back without something in between. |
2392 | * We can skip that something in between. | |
2393 | */ | |
2394 | continue; | |
2395 | } | |
2396 | skip_more: | |
2397 | do { | |
2398 | ptr++; | |
2399 | } while (isalnum(*ptr) || *ptr == '_'); | |
3193899d SRRH |
2400 | if (!*ptr) |
2401 | break; | |
0c564a53 SRRH |
2402 | /* |
2403 | * If what comes after this variable is a '.' or | |
2404 | * '->' then we can continue to ignore that string. | |
2405 | */ | |
2406 | if (*ptr == '.' || (ptr[0] == '-' && ptr[1] == '>')) { | |
2407 | ptr += *ptr == '.' ? 1 : 2; | |
3193899d SRRH |
2408 | if (!*ptr) |
2409 | break; | |
0c564a53 SRRH |
2410 | goto skip_more; |
2411 | } | |
2412 | /* | |
2413 | * Once again, we can skip the delimiter that came | |
2414 | * after the string. | |
2415 | */ | |
2416 | continue; | |
2417 | } | |
2418 | } | |
2419 | } | |
2420 | ||
f57a4143 | 2421 | void trace_event_eval_update(struct trace_eval_map **map, int len) |
0c564a53 | 2422 | { |
2425bcb9 | 2423 | struct trace_event_call *call, *p; |
0c564a53 | 2424 | const char *last_system = NULL; |
1ebe1eaf | 2425 | bool first = false; |
0c564a53 SRRH |
2426 | int last_i; |
2427 | int i; | |
2428 | ||
2429 | down_write(&trace_event_sem); | |
2430 | list_for_each_entry_safe(call, p, &ftrace_events, list) { | |
2431 | /* events are usually grouped together with systems */ | |
2432 | if (!last_system || call->class->system != last_system) { | |
1ebe1eaf | 2433 | first = true; |
0c564a53 SRRH |
2434 | last_i = 0; |
2435 | last_system = call->class->system; | |
2436 | } | |
2437 | ||
1ebe1eaf SRV |
2438 | /* |
2439 | * Since calls are grouped by systems, the likelyhood that the | |
2440 | * next call in the iteration belongs to the same system as the | |
2b5894cc | 2441 | * previous call is high. As an optimization, we skip searching |
1ebe1eaf SRV |
2442 | * for a map[] that matches the call's system if the last call |
2443 | * was from the same system. That's what last_i is for. If the | |
2444 | * call has the same system as the previous call, then last_i | |
2445 | * will be the index of the first map[] that has a matching | |
2446 | * system. | |
2447 | */ | |
0c564a53 SRRH |
2448 | for (i = last_i; i < len; i++) { |
2449 | if (call->class->system == map[i]->system) { | |
2450 | /* Save the first system if need be */ | |
1ebe1eaf | 2451 | if (first) { |
0c564a53 | 2452 | last_i = i; |
1ebe1eaf SRV |
2453 | first = false; |
2454 | } | |
0c564a53 SRRH |
2455 | update_event_printk(call, map[i]); |
2456 | } | |
2457 | } | |
2458 | } | |
2459 | up_write(&trace_event_sem); | |
2460 | } | |
2461 | ||
7f1d2f82 | 2462 | static struct trace_event_file * |
2425bcb9 | 2463 | trace_create_new_event(struct trace_event_call *call, |
da511bf3 SRRH |
2464 | struct trace_array *tr) |
2465 | { | |
7f1d2f82 | 2466 | struct trace_event_file *file; |
da511bf3 SRRH |
2467 | |
2468 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); | |
2469 | if (!file) | |
2470 | return NULL; | |
2471 | ||
2472 | file->event_call = call; | |
2473 | file->tr = tr; | |
2474 | atomic_set(&file->sm_ref, 0); | |
85f2b082 TZ |
2475 | atomic_set(&file->tm_ref, 0); |
2476 | INIT_LIST_HEAD(&file->triggers); | |
da511bf3 SRRH |
2477 | list_add(&file->list, &tr->events); |
2478 | ||
2479 | return file; | |
2480 | } | |
2481 | ||
ae63b31e SR |
2482 | /* Add an event to a trace directory */ |
2483 | static int | |
2425bcb9 | 2484 | __trace_add_new_event(struct trace_event_call *call, struct trace_array *tr) |
ae63b31e | 2485 | { |
7f1d2f82 | 2486 | struct trace_event_file *file; |
ae63b31e | 2487 | |
da511bf3 | 2488 | file = trace_create_new_event(call, tr); |
ae63b31e SR |
2489 | if (!file) |
2490 | return -ENOMEM; | |
2491 | ||
a838deab MH |
2492 | if (eventdir_initialized) |
2493 | return event_create_dir(tr->event_dir, file); | |
2494 | else | |
2495 | return event_define_fields(call); | |
ae63b31e SR |
2496 | } |
2497 | ||
77248221 SR |
2498 | /* |
2499 | * Just create a decriptor for early init. A descriptor is required | |
2500 | * for enabling events at boot. We want to enable events before | |
2501 | * the filesystem is initialized. | |
2502 | */ | |
ce66f613 | 2503 | static int |
2425bcb9 | 2504 | __trace_early_add_new_event(struct trace_event_call *call, |
77248221 SR |
2505 | struct trace_array *tr) |
2506 | { | |
7f1d2f82 | 2507 | struct trace_event_file *file; |
77248221 | 2508 | |
da511bf3 | 2509 | file = trace_create_new_event(call, tr); |
77248221 SR |
2510 | if (!file) |
2511 | return -ENOMEM; | |
2512 | ||
ac343da7 | 2513 | return event_define_fields(call); |
77248221 SR |
2514 | } |
2515 | ||
ae63b31e | 2516 | struct ftrace_module_file_ops; |
2425bcb9 | 2517 | static void __add_event_to_tracers(struct trace_event_call *call); |
ae63b31e | 2518 | |
7e1413ed SRV |
2519 | /* Add an additional event_call dynamically */ |
2520 | int trace_add_event_call(struct trace_event_call *call) | |
bd1a5c84 MH |
2521 | { |
2522 | int ret; | |
fc800a10 MH |
2523 | lockdep_assert_held(&event_mutex); |
2524 | ||
12ecef0c | 2525 | mutex_lock(&trace_types_lock); |
701970b3 | 2526 | |
ae63b31e SR |
2527 | ret = __register_event(call, NULL); |
2528 | if (ret >= 0) | |
779c5e37 | 2529 | __add_event_to_tracers(call); |
a2ca5e03 | 2530 | |
a8227415 | 2531 | mutex_unlock(&trace_types_lock); |
fc800a10 MH |
2532 | return ret; |
2533 | } | |
2534 | ||
4fead8e4 | 2535 | /* |
a8227415 AL |
2536 | * Must be called under locking of trace_types_lock, event_mutex and |
2537 | * trace_event_sem. | |
4fead8e4 | 2538 | */ |
2425bcb9 | 2539 | static void __trace_remove_event_call(struct trace_event_call *call) |
bd1a5c84 | 2540 | { |
8781915a | 2541 | event_remove(call); |
bd1a5c84 | 2542 | trace_destroy_fields(call); |
57375747 ON |
2543 | free_event_filter(call->filter); |
2544 | call->filter = NULL; | |
bd1a5c84 MH |
2545 | } |
2546 | ||
2425bcb9 | 2547 | static int probe_remove_event_call(struct trace_event_call *call) |
2816c551 ON |
2548 | { |
2549 | struct trace_array *tr; | |
7f1d2f82 | 2550 | struct trace_event_file *file; |
2816c551 ON |
2551 | |
2552 | #ifdef CONFIG_PERF_EVENTS | |
2553 | if (call->perf_refcount) | |
2554 | return -EBUSY; | |
2555 | #endif | |
2556 | do_for_each_event_file(tr, file) { | |
2557 | if (file->event_call != call) | |
2558 | continue; | |
2559 | /* | |
2560 | * We can't rely on ftrace_event_enable_disable(enable => 0) | |
5d6ad960 | 2561 | * we are going to do, EVENT_FILE_FL_SOFT_MODE can suppress |
2816c551 ON |
2562 | * TRACE_REG_UNREGISTER. |
2563 | */ | |
5d6ad960 | 2564 | if (file->flags & EVENT_FILE_FL_ENABLED) |
2816c551 | 2565 | return -EBUSY; |
2ba64035 SRRH |
2566 | /* |
2567 | * The do_for_each_event_file_safe() is | |
2568 | * a double loop. After finding the call for this | |
2569 | * trace_array, we use break to jump to the next | |
2570 | * trace_array. | |
2571 | */ | |
2816c551 ON |
2572 | break; |
2573 | } while_for_each_event_file(); | |
2574 | ||
2575 | __trace_remove_event_call(call); | |
2576 | ||
2577 | return 0; | |
2578 | } | |
2579 | ||
7e1413ed SRV |
2580 | /* Remove an event_call */ |
2581 | int trace_remove_event_call(struct trace_event_call *call) | |
bd1a5c84 | 2582 | { |
2816c551 ON |
2583 | int ret; |
2584 | ||
fc800a10 MH |
2585 | lockdep_assert_held(&event_mutex); |
2586 | ||
12ecef0c | 2587 | mutex_lock(&trace_types_lock); |
52f6ad6d | 2588 | down_write(&trace_event_sem); |
2816c551 | 2589 | ret = probe_remove_event_call(call); |
52f6ad6d | 2590 | up_write(&trace_event_sem); |
a8227415 | 2591 | mutex_unlock(&trace_types_lock); |
fc800a10 MH |
2592 | |
2593 | return ret; | |
2594 | } | |
2595 | ||
bd1a5c84 MH |
2596 | #define for_each_event(event, start, end) \ |
2597 | for (event = start; \ | |
2598 | (unsigned long)event < (unsigned long)end; \ | |
2599 | event++) | |
2600 | ||
2601 | #ifdef CONFIG_MODULES | |
2602 | ||
6d723736 SR |
2603 | static void trace_module_add_events(struct module *mod) |
2604 | { | |
2425bcb9 | 2605 | struct trace_event_call **call, **start, **end; |
6d723736 | 2606 | |
45ab2813 SRRH |
2607 | if (!mod->num_trace_events) |
2608 | return; | |
2609 | ||
2610 | /* Don't add infrastructure for mods without tracepoints */ | |
2611 | if (trace_module_has_bad_taint(mod)) { | |
2612 | pr_err("%s: module has bad taint, not creating trace events\n", | |
2613 | mod->name); | |
2614 | return; | |
2615 | } | |
2616 | ||
6d723736 SR |
2617 | start = mod->trace_events; |
2618 | end = mod->trace_events + mod->num_trace_events; | |
2619 | ||
6d723736 | 2620 | for_each_event(call, start, end) { |
ae63b31e | 2621 | __register_event(*call, mod); |
779c5e37 | 2622 | __add_event_to_tracers(*call); |
6d723736 SR |
2623 | } |
2624 | } | |
2625 | ||
2626 | static void trace_module_remove_events(struct module *mod) | |
2627 | { | |
2425bcb9 | 2628 | struct trace_event_call *call, *p; |
6d723736 | 2629 | |
52f6ad6d | 2630 | down_write(&trace_event_sem); |
6d723736 | 2631 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
065e63f9 | 2632 | if (call->mod == mod) |
bd1a5c84 | 2633 | __trace_remove_event_call(call); |
6d723736 | 2634 | } |
52f6ad6d | 2635 | up_write(&trace_event_sem); |
9456f0fa SR |
2636 | |
2637 | /* | |
2638 | * It is safest to reset the ring buffer if the module being unloaded | |
873c642f SRRH |
2639 | * registered any events that were used. The only worry is if |
2640 | * a new module gets loaded, and takes on the same id as the events | |
2641 | * of this module. When printing out the buffer, traced events left | |
2642 | * over from this module may be passed to the new module events and | |
2643 | * unexpected results may occur. | |
9456f0fa | 2644 | */ |
065e63f9 | 2645 | tracing_reset_all_online_cpus(); |
6d723736 SR |
2646 | } |
2647 | ||
61f919a1 SR |
2648 | static int trace_module_notify(struct notifier_block *self, |
2649 | unsigned long val, void *data) | |
6d723736 SR |
2650 | { |
2651 | struct module *mod = data; | |
2652 | ||
2653 | mutex_lock(&event_mutex); | |
12ecef0c | 2654 | mutex_lock(&trace_types_lock); |
6d723736 SR |
2655 | switch (val) { |
2656 | case MODULE_STATE_COMING: | |
2657 | trace_module_add_events(mod); | |
2658 | break; | |
2659 | case MODULE_STATE_GOING: | |
2660 | trace_module_remove_events(mod); | |
2661 | break; | |
2662 | } | |
a8227415 | 2663 | mutex_unlock(&trace_types_lock); |
12ecef0c | 2664 | mutex_unlock(&event_mutex); |
fd994989 | 2665 | |
0340a6b7 | 2666 | return NOTIFY_OK; |
1473e441 | 2667 | } |
315326c1 | 2668 | |
836d481e ON |
2669 | static struct notifier_block trace_module_nb = { |
2670 | .notifier_call = trace_module_notify, | |
3673b8e4 | 2671 | .priority = 1, /* higher than trace.c module notify */ |
836d481e | 2672 | }; |
61f919a1 | 2673 | #endif /* CONFIG_MODULES */ |
1473e441 | 2674 | |
ae63b31e SR |
2675 | /* Create a new event directory structure for a trace directory. */ |
2676 | static void | |
2677 | __trace_add_event_dirs(struct trace_array *tr) | |
2678 | { | |
2425bcb9 | 2679 | struct trace_event_call *call; |
ae63b31e SR |
2680 | int ret; |
2681 | ||
2682 | list_for_each_entry(call, &ftrace_events, list) { | |
620a30e9 | 2683 | ret = __trace_add_new_event(call, tr); |
ae63b31e | 2684 | if (ret < 0) |
3448bac3 | 2685 | pr_warn("Could not create directory for event %s\n", |
687fcc4a | 2686 | trace_event_name(call)); |
ae63b31e SR |
2687 | } |
2688 | } | |
2689 | ||
3c96529c | 2690 | /* Returns any file that matches the system and event */ |
7f1d2f82 | 2691 | struct trace_event_file * |
3c96529c | 2692 | __find_event_file(struct trace_array *tr, const char *system, const char *event) |
3cd715de | 2693 | { |
7f1d2f82 | 2694 | struct trace_event_file *file; |
2425bcb9 | 2695 | struct trace_event_call *call; |
de7b2973 | 2696 | const char *name; |
3cd715de SRRH |
2697 | |
2698 | list_for_each_entry(file, &tr->events, list) { | |
2699 | ||
2700 | call = file->event_call; | |
687fcc4a | 2701 | name = trace_event_name(call); |
3cd715de | 2702 | |
3c96529c | 2703 | if (!name || !call->class) |
3cd715de SRRH |
2704 | continue; |
2705 | ||
de7b2973 | 2706 | if (strcmp(event, name) == 0 && |
3cd715de SRRH |
2707 | strcmp(system, call->class->system) == 0) |
2708 | return file; | |
2709 | } | |
2710 | return NULL; | |
2711 | } | |
2712 | ||
3c96529c SRV |
2713 | /* Returns valid trace event files that match system and event */ |
2714 | struct trace_event_file * | |
2715 | find_event_file(struct trace_array *tr, const char *system, const char *event) | |
2716 | { | |
2717 | struct trace_event_file *file; | |
2718 | ||
2719 | file = __find_event_file(tr, system, event); | |
2720 | if (!file || !file->event_call->class->reg || | |
2721 | file->event_call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) | |
2722 | return NULL; | |
2723 | ||
2724 | return file; | |
2725 | } | |
2726 | ||
e3e2a2cc TZ |
2727 | /** |
2728 | * trace_get_event_file - Find and return a trace event file | |
2729 | * @instance: The name of the trace instance containing the event | |
2730 | * @system: The name of the system containing the event | |
2731 | * @event: The name of the event | |
2732 | * | |
2733 | * Return a trace event file given the trace instance name, trace | |
2734 | * system, and trace event name. If the instance name is NULL, it | |
2735 | * refers to the top-level trace array. | |
2736 | * | |
2737 | * This function will look it up and return it if found, after calling | |
2738 | * trace_array_get() to prevent the instance from going away, and | |
2739 | * increment the event's module refcount to prevent it from being | |
2740 | * removed. | |
2741 | * | |
2742 | * To release the file, call trace_put_event_file(), which will call | |
2743 | * trace_array_put() and decrement the event's module refcount. | |
2744 | * | |
2745 | * Return: The trace event on success, ERR_PTR otherwise. | |
2746 | */ | |
2747 | struct trace_event_file *trace_get_event_file(const char *instance, | |
2748 | const char *system, | |
2749 | const char *event) | |
2750 | { | |
2751 | struct trace_array *tr = top_trace_array(); | |
2752 | struct trace_event_file *file = NULL; | |
2753 | int ret = -EINVAL; | |
2754 | ||
2755 | if (instance) { | |
2756 | tr = trace_array_find_get(instance); | |
2757 | if (!tr) | |
2758 | return ERR_PTR(-ENOENT); | |
2759 | } else { | |
2760 | ret = trace_array_get(tr); | |
2761 | if (ret) | |
2762 | return ERR_PTR(ret); | |
2763 | } | |
2764 | ||
2765 | mutex_lock(&event_mutex); | |
2766 | ||
2767 | file = find_event_file(tr, system, event); | |
2768 | if (!file) { | |
2769 | trace_array_put(tr); | |
2770 | ret = -EINVAL; | |
2771 | goto out; | |
2772 | } | |
2773 | ||
2774 | /* Don't let event modules unload while in use */ | |
2775 | ret = try_module_get(file->event_call->mod); | |
2776 | if (!ret) { | |
2777 | trace_array_put(tr); | |
2778 | ret = -EBUSY; | |
2779 | goto out; | |
2780 | } | |
2781 | ||
2782 | ret = 0; | |
2783 | out: | |
2784 | mutex_unlock(&event_mutex); | |
2785 | ||
2786 | if (ret) | |
2787 | file = ERR_PTR(ret); | |
2788 | ||
2789 | return file; | |
2790 | } | |
2791 | EXPORT_SYMBOL_GPL(trace_get_event_file); | |
2792 | ||
2793 | /** | |
2794 | * trace_put_event_file - Release a file from trace_get_event_file() | |
2795 | * @file: The trace event file | |
2796 | * | |
2797 | * If a file was retrieved using trace_get_event_file(), this should | |
2798 | * be called when it's no longer needed. It will cancel the previous | |
2799 | * trace_array_get() called by that function, and decrement the | |
2800 | * event's module refcount. | |
2801 | */ | |
2802 | void trace_put_event_file(struct trace_event_file *file) | |
2803 | { | |
2804 | mutex_lock(&event_mutex); | |
2805 | module_put(file->event_call->mod); | |
2806 | mutex_unlock(&event_mutex); | |
2807 | ||
2808 | trace_array_put(file->tr); | |
2809 | } | |
2810 | EXPORT_SYMBOL_GPL(trace_put_event_file); | |
2811 | ||
2875a08b SRRH |
2812 | #ifdef CONFIG_DYNAMIC_FTRACE |
2813 | ||
2814 | /* Avoid typos */ | |
2815 | #define ENABLE_EVENT_STR "enable_event" | |
2816 | #define DISABLE_EVENT_STR "disable_event" | |
2817 | ||
2818 | struct event_probe_data { | |
7f1d2f82 | 2819 | struct trace_event_file *file; |
2875a08b SRRH |
2820 | unsigned long count; |
2821 | int ref; | |
2822 | bool enable; | |
2823 | }; | |
2824 | ||
41794f19 SRV |
2825 | static void update_event_probe(struct event_probe_data *data) |
2826 | { | |
2827 | if (data->enable) | |
2828 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); | |
2829 | else | |
2830 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); | |
2831 | } | |
2832 | ||
3cd715de | 2833 | static void |
bca6c8d0 | 2834 | event_enable_probe(unsigned long ip, unsigned long parent_ip, |
b5f081b5 | 2835 | struct trace_array *tr, struct ftrace_probe_ops *ops, |
6e444319 | 2836 | void *data) |
3cd715de | 2837 | { |
6e444319 SRV |
2838 | struct ftrace_func_mapper *mapper = data; |
2839 | struct event_probe_data *edata; | |
41794f19 | 2840 | void **pdata; |
3cd715de | 2841 | |
41794f19 SRV |
2842 | pdata = ftrace_func_mapper_find_ip(mapper, ip); |
2843 | if (!pdata || !*pdata) | |
3cd715de SRRH |
2844 | return; |
2845 | ||
6e444319 SRV |
2846 | edata = *pdata; |
2847 | update_event_probe(edata); | |
3cd715de SRRH |
2848 | } |
2849 | ||
2850 | static void | |
bca6c8d0 | 2851 | event_enable_count_probe(unsigned long ip, unsigned long parent_ip, |
b5f081b5 | 2852 | struct trace_array *tr, struct ftrace_probe_ops *ops, |
6e444319 | 2853 | void *data) |
3cd715de | 2854 | { |
6e444319 SRV |
2855 | struct ftrace_func_mapper *mapper = data; |
2856 | struct event_probe_data *edata; | |
41794f19 | 2857 | void **pdata; |
3cd715de | 2858 | |
41794f19 SRV |
2859 | pdata = ftrace_func_mapper_find_ip(mapper, ip); |
2860 | if (!pdata || !*pdata) | |
3cd715de SRRH |
2861 | return; |
2862 | ||
6e444319 | 2863 | edata = *pdata; |
41794f19 | 2864 | |
6e444319 | 2865 | if (!edata->count) |
3cd715de SRRH |
2866 | return; |
2867 | ||
2868 | /* Skip if the event is in a state we want to switch to */ | |
6e444319 | 2869 | if (edata->enable == !(edata->file->flags & EVENT_FILE_FL_SOFT_DISABLED)) |
3cd715de SRRH |
2870 | return; |
2871 | ||
6e444319 SRV |
2872 | if (edata->count != -1) |
2873 | (edata->count)--; | |
3cd715de | 2874 | |
6e444319 | 2875 | update_event_probe(edata); |
3cd715de SRRH |
2876 | } |
2877 | ||
2878 | static int | |
2879 | event_enable_print(struct seq_file *m, unsigned long ip, | |
6e444319 | 2880 | struct ftrace_probe_ops *ops, void *data) |
3cd715de | 2881 | { |
6e444319 SRV |
2882 | struct ftrace_func_mapper *mapper = data; |
2883 | struct event_probe_data *edata; | |
41794f19 SRV |
2884 | void **pdata; |
2885 | ||
2886 | pdata = ftrace_func_mapper_find_ip(mapper, ip); | |
2887 | ||
2888 | if (WARN_ON_ONCE(!pdata || !*pdata)) | |
2889 | return 0; | |
2890 | ||
6e444319 | 2891 | edata = *pdata; |
3cd715de SRRH |
2892 | |
2893 | seq_printf(m, "%ps:", (void *)ip); | |
2894 | ||
2895 | seq_printf(m, "%s:%s:%s", | |
6e444319 SRV |
2896 | edata->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR, |
2897 | edata->file->event_call->class->system, | |
2898 | trace_event_name(edata->file->event_call)); | |
3cd715de | 2899 | |
6e444319 | 2900 | if (edata->count == -1) |
fa6f0cc7 | 2901 | seq_puts(m, ":unlimited\n"); |
3cd715de | 2902 | else |
6e444319 | 2903 | seq_printf(m, ":count=%ld\n", edata->count); |
3cd715de SRRH |
2904 | |
2905 | return 0; | |
2906 | } | |
2907 | ||
2908 | static int | |
b5f081b5 | 2909 | event_enable_init(struct ftrace_probe_ops *ops, struct trace_array *tr, |
6e444319 | 2910 | unsigned long ip, void *init_data, void **data) |
3cd715de | 2911 | { |
6e444319 SRV |
2912 | struct ftrace_func_mapper *mapper = *data; |
2913 | struct event_probe_data *edata = init_data; | |
41794f19 SRV |
2914 | int ret; |
2915 | ||
6e444319 SRV |
2916 | if (!mapper) { |
2917 | mapper = allocate_ftrace_func_mapper(); | |
2918 | if (!mapper) | |
2919 | return -ENODEV; | |
2920 | *data = mapper; | |
2921 | } | |
2922 | ||
2923 | ret = ftrace_func_mapper_add_ip(mapper, ip, edata); | |
41794f19 SRV |
2924 | if (ret < 0) |
2925 | return ret; | |
3cd715de | 2926 | |
6e444319 SRV |
2927 | edata->ref++; |
2928 | ||
2929 | return 0; | |
2930 | } | |
2931 | ||
2932 | static int free_probe_data(void *data) | |
2933 | { | |
2934 | struct event_probe_data *edata = data; | |
41794f19 | 2935 | |
6e444319 SRV |
2936 | edata->ref--; |
2937 | if (!edata->ref) { | |
2938 | /* Remove the SOFT_MODE flag */ | |
2939 | __ftrace_event_enable_disable(edata->file, 0, 1); | |
2940 | module_put(edata->file->event_call->mod); | |
2941 | kfree(edata); | |
2942 | } | |
3cd715de SRRH |
2943 | return 0; |
2944 | } | |
2945 | ||
2946 | static void | |
b5f081b5 | 2947 | event_enable_free(struct ftrace_probe_ops *ops, struct trace_array *tr, |
6e444319 | 2948 | unsigned long ip, void *data) |
3cd715de | 2949 | { |
6e444319 SRV |
2950 | struct ftrace_func_mapper *mapper = data; |
2951 | struct event_probe_data *edata; | |
2952 | ||
2953 | if (!ip) { | |
2954 | if (!mapper) | |
2955 | return; | |
2956 | free_ftrace_func_mapper(mapper, free_probe_data); | |
2957 | return; | |
2958 | } | |
41794f19 | 2959 | |
6e444319 | 2960 | edata = ftrace_func_mapper_remove_ip(mapper, ip); |
41794f19 | 2961 | |
6e444319 | 2962 | if (WARN_ON_ONCE(!edata)) |
41794f19 | 2963 | return; |
3cd715de | 2964 | |
6e444319 | 2965 | if (WARN_ON_ONCE(edata->ref <= 0)) |
3cd715de SRRH |
2966 | return; |
2967 | ||
6e444319 | 2968 | free_probe_data(edata); |
3cd715de SRRH |
2969 | } |
2970 | ||
2971 | static struct ftrace_probe_ops event_enable_probe_ops = { | |
2972 | .func = event_enable_probe, | |
2973 | .print = event_enable_print, | |
2974 | .init = event_enable_init, | |
2975 | .free = event_enable_free, | |
2976 | }; | |
2977 | ||
2978 | static struct ftrace_probe_ops event_enable_count_probe_ops = { | |
2979 | .func = event_enable_count_probe, | |
2980 | .print = event_enable_print, | |
2981 | .init = event_enable_init, | |
2982 | .free = event_enable_free, | |
2983 | }; | |
2984 | ||
2985 | static struct ftrace_probe_ops event_disable_probe_ops = { | |
2986 | .func = event_enable_probe, | |
2987 | .print = event_enable_print, | |
2988 | .init = event_enable_init, | |
2989 | .free = event_enable_free, | |
2990 | }; | |
2991 | ||
2992 | static struct ftrace_probe_ops event_disable_count_probe_ops = { | |
2993 | .func = event_enable_count_probe, | |
2994 | .print = event_enable_print, | |
2995 | .init = event_enable_init, | |
2996 | .free = event_enable_free, | |
2997 | }; | |
2998 | ||
2999 | static int | |
04ec7bb6 | 3000 | event_enable_func(struct trace_array *tr, struct ftrace_hash *hash, |
3cd715de SRRH |
3001 | char *glob, char *cmd, char *param, int enabled) |
3002 | { | |
7f1d2f82 | 3003 | struct trace_event_file *file; |
3cd715de SRRH |
3004 | struct ftrace_probe_ops *ops; |
3005 | struct event_probe_data *data; | |
3006 | const char *system; | |
3007 | const char *event; | |
3008 | char *number; | |
3009 | bool enable; | |
3010 | int ret; | |
3011 | ||
dc81e5e3 YY |
3012 | if (!tr) |
3013 | return -ENODEV; | |
3014 | ||
3cd715de | 3015 | /* hash funcs only work with set_ftrace_filter */ |
8092e808 | 3016 | if (!enabled || !param) |
3cd715de SRRH |
3017 | return -EINVAL; |
3018 | ||
3019 | system = strsep(¶m, ":"); | |
3020 | if (!param) | |
3021 | return -EINVAL; | |
3022 | ||
3023 | event = strsep(¶m, ":"); | |
3024 | ||
3025 | mutex_lock(&event_mutex); | |
3026 | ||
3027 | ret = -EINVAL; | |
3028 | file = find_event_file(tr, system, event); | |
3029 | if (!file) | |
3030 | goto out; | |
3031 | ||
3032 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; | |
3033 | ||
3034 | if (enable) | |
3035 | ops = param ? &event_enable_count_probe_ops : &event_enable_probe_ops; | |
3036 | else | |
3037 | ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops; | |
3038 | ||
3039 | if (glob[0] == '!') { | |
7b60f3d8 | 3040 | ret = unregister_ftrace_function_probe_func(glob+1, tr, ops); |
3cd715de SRRH |
3041 | goto out; |
3042 | } | |
3043 | ||
3044 | ret = -ENOMEM; | |
41794f19 | 3045 | |
3cd715de SRRH |
3046 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
3047 | if (!data) | |
3048 | goto out; | |
3049 | ||
3050 | data->enable = enable; | |
3051 | data->count = -1; | |
3052 | data->file = file; | |
3053 | ||
3054 | if (!param) | |
3055 | goto out_reg; | |
3056 | ||
3057 | number = strsep(¶m, ":"); | |
3058 | ||
3059 | ret = -EINVAL; | |
3060 | if (!strlen(number)) | |
3061 | goto out_free; | |
3062 | ||
3063 | /* | |
3064 | * We use the callback data field (which is a pointer) | |
3065 | * as our counter. | |
3066 | */ | |
3067 | ret = kstrtoul(number, 0, &data->count); | |
3068 | if (ret) | |
3069 | goto out_free; | |
3070 | ||
3071 | out_reg: | |
3072 | /* Don't let event modules unload while probe registered */ | |
3073 | ret = try_module_get(file->event_call->mod); | |
6ed01066 MH |
3074 | if (!ret) { |
3075 | ret = -EBUSY; | |
3cd715de | 3076 | goto out_free; |
6ed01066 | 3077 | } |
3cd715de SRRH |
3078 | |
3079 | ret = __ftrace_event_enable_disable(file, 1, 1); | |
3080 | if (ret < 0) | |
3081 | goto out_put; | |
41794f19 | 3082 | |
04ec7bb6 | 3083 | ret = register_ftrace_function_probe(glob, tr, ops, data); |
ff305ded SRRH |
3084 | /* |
3085 | * The above returns on success the # of functions enabled, | |
3086 | * but if it didn't find any functions it returns zero. | |
3087 | * Consider no functions a failure too. | |
3088 | */ | |
a5b85bd1 MH |
3089 | if (!ret) { |
3090 | ret = -ENOENT; | |
3cd715de | 3091 | goto out_disable; |
ff305ded SRRH |
3092 | } else if (ret < 0) |
3093 | goto out_disable; | |
3094 | /* Just return zero, not the number of enabled functions */ | |
3095 | ret = 0; | |
3cd715de SRRH |
3096 | out: |
3097 | mutex_unlock(&event_mutex); | |
3098 | return ret; | |
3099 | ||
3100 | out_disable: | |
3101 | __ftrace_event_enable_disable(file, 0, 1); | |
3102 | out_put: | |
3103 | module_put(file->event_call->mod); | |
3104 | out_free: | |
3105 | kfree(data); | |
3106 | goto out; | |
3107 | } | |
3108 | ||
3109 | static struct ftrace_func_command event_enable_cmd = { | |
3110 | .name = ENABLE_EVENT_STR, | |
3111 | .func = event_enable_func, | |
3112 | }; | |
3113 | ||
3114 | static struct ftrace_func_command event_disable_cmd = { | |
3115 | .name = DISABLE_EVENT_STR, | |
3116 | .func = event_enable_func, | |
3117 | }; | |
3118 | ||
3119 | static __init int register_event_cmds(void) | |
3120 | { | |
3121 | int ret; | |
3122 | ||
3123 | ret = register_ftrace_command(&event_enable_cmd); | |
3124 | if (WARN_ON(ret < 0)) | |
3125 | return ret; | |
3126 | ret = register_ftrace_command(&event_disable_cmd); | |
3127 | if (WARN_ON(ret < 0)) | |
3128 | unregister_ftrace_command(&event_enable_cmd); | |
3129 | return ret; | |
3130 | } | |
3131 | #else | |
3132 | static inline int register_event_cmds(void) { return 0; } | |
3133 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
3134 | ||
77248221 | 3135 | /* |
720dee53 MH |
3136 | * The top level array and trace arrays created by boot-time tracing |
3137 | * have already had its trace_event_file descriptors created in order | |
3138 | * to allow for early events to be recorded. | |
3139 | * This function is called after the tracefs has been initialized, | |
3140 | * and we now have to create the files associated to the events. | |
77248221 | 3141 | */ |
720dee53 | 3142 | static void __trace_early_add_event_dirs(struct trace_array *tr) |
77248221 | 3143 | { |
7f1d2f82 | 3144 | struct trace_event_file *file; |
77248221 SR |
3145 | int ret; |
3146 | ||
3147 | ||
3148 | list_for_each_entry(file, &tr->events, list) { | |
620a30e9 | 3149 | ret = event_create_dir(tr->event_dir, file); |
77248221 | 3150 | if (ret < 0) |
3448bac3 | 3151 | pr_warn("Could not create directory for event %s\n", |
687fcc4a | 3152 | trace_event_name(file->event_call)); |
77248221 SR |
3153 | } |
3154 | } | |
3155 | ||
3156 | /* | |
720dee53 MH |
3157 | * For early boot up, the top trace array and the trace arrays created |
3158 | * by boot-time tracing require to have a list of events that can be | |
3159 | * enabled. This must be done before the filesystem is set up in order | |
3160 | * to allow events to be traced early. | |
77248221 | 3161 | */ |
720dee53 | 3162 | void __trace_early_add_events(struct trace_array *tr) |
77248221 | 3163 | { |
2425bcb9 | 3164 | struct trace_event_call *call; |
77248221 SR |
3165 | int ret; |
3166 | ||
3167 | list_for_each_entry(call, &ftrace_events, list) { | |
3168 | /* Early boot up should not have any modules loaded */ | |
3169 | if (WARN_ON_ONCE(call->mod)) | |
3170 | continue; | |
3171 | ||
3172 | ret = __trace_early_add_new_event(call, tr); | |
3173 | if (ret < 0) | |
3448bac3 | 3174 | pr_warn("Could not create early event %s\n", |
687fcc4a | 3175 | trace_event_name(call)); |
77248221 SR |
3176 | } |
3177 | } | |
3178 | ||
0c8916c3 SR |
3179 | /* Remove the event directory structure for a trace directory. */ |
3180 | static void | |
3181 | __trace_remove_event_dirs(struct trace_array *tr) | |
3182 | { | |
7f1d2f82 | 3183 | struct trace_event_file *file, *next; |
0c8916c3 | 3184 | |
f6a84bdc ON |
3185 | list_for_each_entry_safe(file, next, &tr->events, list) |
3186 | remove_event_file_dir(file); | |
0c8916c3 SR |
3187 | } |
3188 | ||
2425bcb9 | 3189 | static void __add_event_to_tracers(struct trace_event_call *call) |
ae63b31e SR |
3190 | { |
3191 | struct trace_array *tr; | |
3192 | ||
620a30e9 ON |
3193 | list_for_each_entry(tr, &ftrace_trace_arrays, list) |
3194 | __trace_add_new_event(call, tr); | |
ae63b31e SR |
3195 | } |
3196 | ||
2425bcb9 SRRH |
3197 | extern struct trace_event_call *__start_ftrace_events[]; |
3198 | extern struct trace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 3199 | |
020e5f85 LZ |
3200 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
3201 | ||
3202 | static __init int setup_trace_event(char *str) | |
3203 | { | |
3204 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
55034cd6 | 3205 | ring_buffer_expanded = true; |
60efe21e | 3206 | disable_tracing_selftest("running event tracing"); |
020e5f85 LZ |
3207 | |
3208 | return 1; | |
3209 | } | |
3210 | __setup("trace_event=", setup_trace_event); | |
3211 | ||
77248221 SR |
3212 | /* Expects to have event_mutex held when called */ |
3213 | static int | |
3214 | create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) | |
ae63b31e SR |
3215 | { |
3216 | struct dentry *d_events; | |
3217 | struct dentry *entry; | |
3218 | ||
8434dc93 | 3219 | entry = tracefs_create_file("set_event", 0644, parent, |
ae63b31e SR |
3220 | tr, &ftrace_set_event_fops); |
3221 | if (!entry) { | |
8434dc93 | 3222 | pr_warn("Could not create tracefs 'set_event' entry\n"); |
ae63b31e SR |
3223 | return -ENOMEM; |
3224 | } | |
3225 | ||
8434dc93 | 3226 | d_events = tracefs_create_dir("events", parent); |
277ba044 | 3227 | if (!d_events) { |
8434dc93 | 3228 | pr_warn("Could not create tracefs 'events' directory\n"); |
277ba044 SR |
3229 | return -ENOMEM; |
3230 | } | |
ae63b31e | 3231 | |
7d436400 SRRH |
3232 | entry = trace_create_file("enable", 0644, d_events, |
3233 | tr, &ftrace_tr_enable_fops); | |
3234 | if (!entry) { | |
3235 | pr_warn("Could not create tracefs 'enable' entry\n"); | |
3236 | return -ENOMEM; | |
3237 | } | |
3238 | ||
3239 | /* There are not as crucial, just warn if they are not created */ | |
3240 | ||
49090107 SRRH |
3241 | entry = tracefs_create_file("set_event_pid", 0644, parent, |
3242 | tr, &ftrace_set_event_pid_fops); | |
7d436400 SRRH |
3243 | if (!entry) |
3244 | pr_warn("Could not create tracefs 'set_event_pid' entry\n"); | |
49090107 | 3245 | |
27683626 SRV |
3246 | entry = tracefs_create_file("set_event_notrace_pid", 0644, parent, |
3247 | tr, &ftrace_set_event_notrace_pid_fops); | |
3248 | if (!entry) | |
3249 | pr_warn("Could not create tracefs 'set_event_notrace_pid' entry\n"); | |
3250 | ||
ae63b31e | 3251 | /* ring buffer internal formats */ |
7d436400 SRRH |
3252 | entry = trace_create_file("header_page", 0444, d_events, |
3253 | ring_buffer_print_page_header, | |
3254 | &ftrace_show_header_fops); | |
3255 | if (!entry) | |
3256 | pr_warn("Could not create tracefs 'header_page' entry\n"); | |
3257 | ||
3258 | entry = trace_create_file("header_event", 0444, d_events, | |
3259 | ring_buffer_print_entry_header, | |
3260 | &ftrace_show_header_fops); | |
3261 | if (!entry) | |
3262 | pr_warn("Could not create tracefs 'header_event' entry\n"); | |
ae63b31e SR |
3263 | |
3264 | tr->event_dir = d_events; | |
77248221 SR |
3265 | |
3266 | return 0; | |
3267 | } | |
3268 | ||
3269 | /** | |
3270 | * event_trace_add_tracer - add a instance of a trace_array to events | |
3271 | * @parent: The parent dentry to place the files/directories for events in | |
3272 | * @tr: The trace array associated with these events | |
3273 | * | |
3274 | * When a new instance is created, it needs to set up its events | |
3275 | * directory, as well as other files associated with events. It also | |
2b5894cc | 3276 | * creates the event hierarchy in the @parent/events directory. |
77248221 SR |
3277 | * |
3278 | * Returns 0 on success. | |
12ecef0c SRV |
3279 | * |
3280 | * Must be called with event_mutex held. | |
77248221 SR |
3281 | */ |
3282 | int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) | |
3283 | { | |
3284 | int ret; | |
3285 | ||
12ecef0c | 3286 | lockdep_assert_held(&event_mutex); |
77248221 SR |
3287 | |
3288 | ret = create_event_toplevel_files(parent, tr); | |
3289 | if (ret) | |
12ecef0c | 3290 | goto out; |
77248221 | 3291 | |
52f6ad6d | 3292 | down_write(&trace_event_sem); |
720dee53 MH |
3293 | /* If tr already has the event list, it is initialized in early boot. */ |
3294 | if (unlikely(!list_empty(&tr->events))) | |
3295 | __trace_early_add_event_dirs(tr); | |
3296 | else | |
3297 | __trace_add_event_dirs(tr); | |
52f6ad6d | 3298 | up_write(&trace_event_sem); |
277ba044 | 3299 | |
12ecef0c | 3300 | out: |
77248221 SR |
3301 | return ret; |
3302 | } | |
3303 | ||
3304 | /* | |
3305 | * The top trace array already had its file descriptors created. | |
3306 | * Now the files themselves need to be created. | |
3307 | */ | |
3308 | static __init int | |
3309 | early_event_add_tracer(struct dentry *parent, struct trace_array *tr) | |
3310 | { | |
3311 | int ret; | |
3312 | ||
3313 | mutex_lock(&event_mutex); | |
3314 | ||
3315 | ret = create_event_toplevel_files(parent, tr); | |
3316 | if (ret) | |
3317 | goto out_unlock; | |
3318 | ||
52f6ad6d | 3319 | down_write(&trace_event_sem); |
77248221 | 3320 | __trace_early_add_event_dirs(tr); |
52f6ad6d | 3321 | up_write(&trace_event_sem); |
77248221 SR |
3322 | |
3323 | out_unlock: | |
3324 | mutex_unlock(&event_mutex); | |
3325 | ||
3326 | return ret; | |
ae63b31e SR |
3327 | } |
3328 | ||
12ecef0c | 3329 | /* Must be called with event_mutex held */ |
0c8916c3 SR |
3330 | int event_trace_del_tracer(struct trace_array *tr) |
3331 | { | |
12ecef0c | 3332 | lockdep_assert_held(&event_mutex); |
0c8916c3 | 3333 | |
85f2b082 TZ |
3334 | /* Disable any event triggers and associated soft-disabled events */ |
3335 | clear_event_triggers(tr); | |
3336 | ||
49090107 | 3337 | /* Clear the pid list */ |
27683626 | 3338 | __ftrace_clear_event_pids(tr, TRACE_PIDS | TRACE_NO_PIDS); |
49090107 | 3339 | |
2a6c24af SRRH |
3340 | /* Disable any running events */ |
3341 | __ftrace_set_clr_event_nolock(tr, NULL, NULL, NULL, 0); | |
3342 | ||
e0a568dc SRV |
3343 | /* Make sure no more events are being executed */ |
3344 | tracepoint_synchronize_unregister(); | |
3ccb0123 | 3345 | |
52f6ad6d | 3346 | down_write(&trace_event_sem); |
0c8916c3 | 3347 | __trace_remove_event_dirs(tr); |
a3d1e7eb | 3348 | tracefs_remove(tr->event_dir); |
52f6ad6d | 3349 | up_write(&trace_event_sem); |
0c8916c3 SR |
3350 | |
3351 | tr->event_dir = NULL; | |
3352 | ||
0c8916c3 SR |
3353 | return 0; |
3354 | } | |
3355 | ||
d1a29143 SR |
3356 | static __init int event_trace_memsetup(void) |
3357 | { | |
3358 | field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); | |
7f1d2f82 | 3359 | file_cachep = KMEM_CACHE(trace_event_file, SLAB_PANIC); |
d1a29143 SR |
3360 | return 0; |
3361 | } | |
3362 | ||
ce1039bd SRRH |
3363 | static __init void |
3364 | early_enable_events(struct trace_array *tr, bool disable_first) | |
3365 | { | |
3366 | char *buf = bootup_event_buf; | |
3367 | char *token; | |
3368 | int ret; | |
3369 | ||
3370 | while (true) { | |
3371 | token = strsep(&buf, ","); | |
3372 | ||
3373 | if (!token) | |
3374 | break; | |
ce1039bd | 3375 | |
43ed3843 SRRH |
3376 | if (*token) { |
3377 | /* Restarting syscalls requires that we stop them first */ | |
3378 | if (disable_first) | |
3379 | ftrace_set_clr_event(tr, token, 0); | |
ce1039bd | 3380 | |
43ed3843 SRRH |
3381 | ret = ftrace_set_clr_event(tr, token, 1); |
3382 | if (ret) | |
3383 | pr_warn("Failed to enable trace event: %s\n", token); | |
3384 | } | |
ce1039bd SRRH |
3385 | |
3386 | /* Put back the comma to allow this to be called again */ | |
3387 | if (buf) | |
3388 | *(buf - 1) = ','; | |
3389 | } | |
3390 | } | |
3391 | ||
8781915a EG |
3392 | static __init int event_trace_enable(void) |
3393 | { | |
ae63b31e | 3394 | struct trace_array *tr = top_trace_array(); |
2425bcb9 | 3395 | struct trace_event_call **iter, *call; |
8781915a EG |
3396 | int ret; |
3397 | ||
dc81e5e3 YY |
3398 | if (!tr) |
3399 | return -ENODEV; | |
3400 | ||
8781915a EG |
3401 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { |
3402 | ||
3403 | call = *iter; | |
3404 | ret = event_init(call); | |
3405 | if (!ret) | |
3406 | list_add(&call->list, &ftrace_events); | |
3407 | } | |
3408 | ||
77248221 SR |
3409 | /* |
3410 | * We need the top trace array to have a working set of trace | |
3411 | * points at early init, before the debug files and directories | |
3412 | * are created. Create the file entries now, and attach them | |
3413 | * to the actual file dentries later. | |
3414 | */ | |
3415 | __trace_early_add_events(tr); | |
3416 | ||
ce1039bd | 3417 | early_enable_events(tr, false); |
81698831 SR |
3418 | |
3419 | trace_printk_start_comm(); | |
3420 | ||
3cd715de SRRH |
3421 | register_event_cmds(); |
3422 | ||
85f2b082 TZ |
3423 | register_trigger_cmds(); |
3424 | ||
8781915a EG |
3425 | return 0; |
3426 | } | |
3427 | ||
ce1039bd SRRH |
3428 | /* |
3429 | * event_trace_enable() is called from trace_event_init() first to | |
3430 | * initialize events and perhaps start any events that are on the | |
3431 | * command line. Unfortunately, there are some events that will not | |
3432 | * start this early, like the system call tracepoints that need | |
524666cb GKB |
3433 | * to set the %SYSCALL_WORK_SYSCALL_TRACEPOINT flag of pid 1. But |
3434 | * event_trace_enable() is called before pid 1 starts, and this flag | |
3435 | * is never set, making the syscall tracepoint never get reached, but | |
3436 | * the event is enabled regardless (and not doing anything). | |
ce1039bd SRRH |
3437 | */ |
3438 | static __init int event_trace_enable_again(void) | |
3439 | { | |
3440 | struct trace_array *tr; | |
3441 | ||
3442 | tr = top_trace_array(); | |
3443 | if (!tr) | |
3444 | return -ENODEV; | |
3445 | ||
3446 | early_enable_events(tr, true); | |
3447 | ||
3448 | return 0; | |
3449 | } | |
3450 | ||
3451 | early_initcall(event_trace_enable_again); | |
3452 | ||
ac343da7 MH |
3453 | /* Init fields which doesn't related to the tracefs */ |
3454 | static __init int event_trace_init_fields(void) | |
3455 | { | |
3456 | if (trace_define_generic_fields()) | |
3457 | pr_warn("tracing: Failed to allocated generic fields"); | |
3458 | ||
3459 | if (trace_define_common_fields()) | |
3460 | pr_warn("tracing: Failed to allocate common fields"); | |
3461 | ||
3462 | return 0; | |
3463 | } | |
3464 | ||
58b92547 | 3465 | __init int event_trace_init(void) |
b77e38aa | 3466 | { |
ae63b31e | 3467 | struct trace_array *tr; |
b77e38aa | 3468 | struct dentry *entry; |
6d723736 | 3469 | int ret; |
b77e38aa | 3470 | |
ae63b31e | 3471 | tr = top_trace_array(); |
dc81e5e3 YY |
3472 | if (!tr) |
3473 | return -ENODEV; | |
ae63b31e | 3474 | |
dc300d77 | 3475 | entry = tracefs_create_file("available_events", 0444, NULL, |
ae63b31e | 3476 | tr, &ftrace_avail_fops); |
2314c4ae | 3477 | if (!entry) |
8434dc93 | 3478 | pr_warn("Could not create tracefs 'available_events' entry\n"); |
2314c4ae | 3479 | |
dc300d77 | 3480 | ret = early_event_add_tracer(NULL, tr); |
ae63b31e SR |
3481 | if (ret) |
3482 | return ret; | |
020e5f85 | 3483 | |
836d481e | 3484 | #ifdef CONFIG_MODULES |
6d723736 | 3485 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 3486 | if (ret) |
3448bac3 | 3487 | pr_warn("Failed to register trace events module notifier\n"); |
836d481e | 3488 | #endif |
a838deab MH |
3489 | |
3490 | eventdir_initialized = true; | |
3491 | ||
b77e38aa SR |
3492 | return 0; |
3493 | } | |
5f893b26 SRRH |
3494 | |
3495 | void __init trace_event_init(void) | |
3496 | { | |
3497 | event_trace_memsetup(); | |
3498 | init_ftrace_syscalls(); | |
3499 | event_trace_enable(); | |
ac343da7 | 3500 | event_trace_init_fields(); |
5f893b26 SRRH |
3501 | } |
3502 | ||
b3015fe4 | 3503 | #ifdef CONFIG_EVENT_TRACE_STARTUP_TEST |
e6187007 SR |
3504 | |
3505 | static DEFINE_SPINLOCK(test_spinlock); | |
3506 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
3507 | static DEFINE_MUTEX(test_mutex); | |
3508 | ||
3509 | static __init void test_work(struct work_struct *dummy) | |
3510 | { | |
3511 | spin_lock(&test_spinlock); | |
3512 | spin_lock_irq(&test_spinlock_irq); | |
3513 | udelay(1); | |
3514 | spin_unlock_irq(&test_spinlock_irq); | |
3515 | spin_unlock(&test_spinlock); | |
3516 | ||
3517 | mutex_lock(&test_mutex); | |
3518 | msleep(1); | |
3519 | mutex_unlock(&test_mutex); | |
3520 | } | |
3521 | ||
3522 | static __init int event_test_thread(void *unused) | |
3523 | { | |
3524 | void *test_malloc; | |
3525 | ||
3526 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
3527 | if (!test_malloc) | |
3528 | pr_info("failed to kmalloc\n"); | |
3529 | ||
3530 | schedule_on_each_cpu(test_work); | |
3531 | ||
3532 | kfree(test_malloc); | |
3533 | ||
3534 | set_current_state(TASK_INTERRUPTIBLE); | |
fe0e01c7 | 3535 | while (!kthread_should_stop()) { |
e6187007 | 3536 | schedule(); |
fe0e01c7 PZ |
3537 | set_current_state(TASK_INTERRUPTIBLE); |
3538 | } | |
3539 | __set_current_state(TASK_RUNNING); | |
e6187007 SR |
3540 | |
3541 | return 0; | |
3542 | } | |
3543 | ||
3544 | /* | |
3545 | * Do various things that may trigger events. | |
3546 | */ | |
3547 | static __init void event_test_stuff(void) | |
3548 | { | |
3549 | struct task_struct *test_thread; | |
3550 | ||
3551 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
3552 | msleep(1); | |
3553 | kthread_stop(test_thread); | |
3554 | } | |
3555 | ||
3556 | /* | |
3557 | * For every trace event defined, we will test each trace point separately, | |
3558 | * and then by groups, and finally all trace points. | |
3559 | */ | |
9ea21c1e | 3560 | static __init void event_trace_self_tests(void) |
e6187007 | 3561 | { |
7967b3e0 | 3562 | struct trace_subsystem_dir *dir; |
7f1d2f82 | 3563 | struct trace_event_file *file; |
2425bcb9 | 3564 | struct trace_event_call *call; |
e6187007 | 3565 | struct event_subsystem *system; |
ae63b31e | 3566 | struct trace_array *tr; |
e6187007 SR |
3567 | int ret; |
3568 | ||
ae63b31e | 3569 | tr = top_trace_array(); |
dc81e5e3 YY |
3570 | if (!tr) |
3571 | return; | |
ae63b31e | 3572 | |
e6187007 SR |
3573 | pr_info("Running tests on trace events:\n"); |
3574 | ||
ae63b31e SR |
3575 | list_for_each_entry(file, &tr->events, list) { |
3576 | ||
3577 | call = file->event_call; | |
e6187007 | 3578 | |
2239291a SR |
3579 | /* Only test those that have a probe */ |
3580 | if (!call->class || !call->class->probe) | |
e6187007 SR |
3581 | continue; |
3582 | ||
1f5a6b45 SR |
3583 | /* |
3584 | * Testing syscall events here is pretty useless, but | |
3585 | * we still do it if configured. But this is time consuming. | |
3586 | * What we really need is a user thread to perform the | |
3587 | * syscalls as we test. | |
3588 | */ | |
3589 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
3590 | if (call->class->system && |
3591 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
3592 | continue; |
3593 | #endif | |
3594 | ||
687fcc4a | 3595 | pr_info("Testing event %s: ", trace_event_name(call)); |
e6187007 SR |
3596 | |
3597 | /* | |
3598 | * If an event is already enabled, someone is using | |
3599 | * it and the self test should not be on. | |
3600 | */ | |
5d6ad960 | 3601 | if (file->flags & EVENT_FILE_FL_ENABLED) { |
3448bac3 | 3602 | pr_warn("Enabled event during self test!\n"); |
e6187007 SR |
3603 | WARN_ON_ONCE(1); |
3604 | continue; | |
3605 | } | |
3606 | ||
ae63b31e | 3607 | ftrace_event_enable_disable(file, 1); |
e6187007 | 3608 | event_test_stuff(); |
ae63b31e | 3609 | ftrace_event_enable_disable(file, 0); |
e6187007 SR |
3610 | |
3611 | pr_cont("OK\n"); | |
3612 | } | |
3613 | ||
3614 | /* Now test at the sub system level */ | |
3615 | ||
3616 | pr_info("Running tests on trace event systems:\n"); | |
3617 | ||
ae63b31e SR |
3618 | list_for_each_entry(dir, &tr->systems, list) { |
3619 | ||
3620 | system = dir->subsystem; | |
e6187007 SR |
3621 | |
3622 | /* the ftrace system is special, skip it */ | |
3623 | if (strcmp(system->name, "ftrace") == 0) | |
3624 | continue; | |
3625 | ||
3626 | pr_info("Testing event system %s: ", system->name); | |
3627 | ||
ae63b31e | 3628 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
e6187007 | 3629 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
3630 | pr_warn("error enabling system %s\n", |
3631 | system->name); | |
e6187007 SR |
3632 | continue; |
3633 | } | |
3634 | ||
3635 | event_test_stuff(); | |
3636 | ||
ae63b31e | 3637 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
76bab1b7 | 3638 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
3639 | pr_warn("error disabling system %s\n", |
3640 | system->name); | |
76bab1b7 YL |
3641 | continue; |
3642 | } | |
e6187007 SR |
3643 | |
3644 | pr_cont("OK\n"); | |
3645 | } | |
3646 | ||
3647 | /* Test with all events enabled */ | |
3648 | ||
3649 | pr_info("Running tests on all trace events:\n"); | |
3650 | pr_info("Testing all events: "); | |
3651 | ||
ae63b31e | 3652 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
e6187007 | 3653 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 3654 | pr_warn("error enabling all events\n"); |
9ea21c1e | 3655 | return; |
e6187007 SR |
3656 | } |
3657 | ||
3658 | event_test_stuff(); | |
3659 | ||
3660 | /* reset sysname */ | |
ae63b31e | 3661 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
e6187007 | 3662 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 3663 | pr_warn("error disabling all events\n"); |
9ea21c1e | 3664 | return; |
e6187007 SR |
3665 | } |
3666 | ||
3667 | pr_cont("OK\n"); | |
9ea21c1e SR |
3668 | } |
3669 | ||
3670 | #ifdef CONFIG_FUNCTION_TRACER | |
3671 | ||
245b2e70 | 3672 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e | 3673 | |
9b9db275 | 3674 | static struct trace_event_file event_trace_file __initdata; |
b7f0c959 SRRH |
3675 | |
3676 | static void __init | |
2f5f6ad9 | 3677 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
d19ad077 | 3678 | struct ftrace_ops *op, struct ftrace_regs *regs) |
9ea21c1e | 3679 | { |
13292494 | 3680 | struct trace_buffer *buffer; |
9ea21c1e SR |
3681 | struct ring_buffer_event *event; |
3682 | struct ftrace_entry *entry; | |
36590c50 | 3683 | unsigned int trace_ctx; |
9ea21c1e | 3684 | long disabled; |
9ea21c1e | 3685 | int cpu; |
9ea21c1e | 3686 | |
36590c50 | 3687 | trace_ctx = tracing_gen_ctx(); |
5168ae50 | 3688 | preempt_disable_notrace(); |
9ea21c1e | 3689 | cpu = raw_smp_processor_id(); |
245b2e70 | 3690 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
3691 | |
3692 | if (disabled != 1) | |
3693 | goto out; | |
3694 | ||
9b9db275 SRRH |
3695 | event = trace_event_buffer_lock_reserve(&buffer, &event_trace_file, |
3696 | TRACE_FN, sizeof(*entry), | |
36590c50 | 3697 | trace_ctx); |
9ea21c1e SR |
3698 | if (!event) |
3699 | goto out; | |
3700 | entry = ring_buffer_event_data(event); | |
3701 | entry->ip = ip; | |
3702 | entry->parent_ip = parent_ip; | |
3703 | ||
9b9db275 | 3704 | event_trigger_unlock_commit(&event_trace_file, buffer, event, |
36590c50 | 3705 | entry, trace_ctx); |
9ea21c1e | 3706 | out: |
245b2e70 | 3707 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 3708 | preempt_enable_notrace(); |
9ea21c1e SR |
3709 | } |
3710 | ||
3711 | static struct ftrace_ops trace_ops __initdata = | |
3712 | { | |
3713 | .func = function_test_events_call, | |
3714 | }; | |
3715 | ||
3716 | static __init void event_trace_self_test_with_function(void) | |
3717 | { | |
17bb615a | 3718 | int ret; |
9b9db275 SRRH |
3719 | |
3720 | event_trace_file.tr = top_trace_array(); | |
3721 | if (WARN_ON(!event_trace_file.tr)) | |
2d34f489 | 3722 | return; |
9b9db275 | 3723 | |
17bb615a SR |
3724 | ret = register_ftrace_function(&trace_ops); |
3725 | if (WARN_ON(ret < 0)) { | |
3726 | pr_info("Failed to enable function tracer for event tests\n"); | |
3727 | return; | |
3728 | } | |
9ea21c1e SR |
3729 | pr_info("Running tests again, along with the function tracer\n"); |
3730 | event_trace_self_tests(); | |
3731 | unregister_ftrace_function(&trace_ops); | |
3732 | } | |
3733 | #else | |
3734 | static __init void event_trace_self_test_with_function(void) | |
3735 | { | |
3736 | } | |
3737 | #endif | |
3738 | ||
3739 | static __init int event_trace_self_tests_init(void) | |
3740 | { | |
020e5f85 LZ |
3741 | if (!tracing_selftest_disabled) { |
3742 | event_trace_self_tests(); | |
3743 | event_trace_self_test_with_function(); | |
3744 | } | |
e6187007 SR |
3745 | |
3746 | return 0; | |
3747 | } | |
3748 | ||
28d20e2d | 3749 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
3750 | |
3751 | #endif |