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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 | |
795301d3 SRG |
43 | static LIST_HEAD(module_strings); |
44 | ||
45 | struct module_string { | |
46 | struct list_head next; | |
47 | struct module *module; | |
48 | char *str; | |
49 | }; | |
50 | ||
d1a29143 SR |
51 | #define GFP_TRACE (GFP_KERNEL | __GFP_ZERO) |
52 | ||
53 | static struct kmem_cache *field_cachep; | |
54 | static struct kmem_cache *file_cachep; | |
55 | ||
6e94a780 SR |
56 | static inline int system_refcount(struct event_subsystem *system) |
57 | { | |
79ac6ef5 | 58 | return system->ref_count; |
6e94a780 SR |
59 | } |
60 | ||
61 | static int system_refcount_inc(struct event_subsystem *system) | |
62 | { | |
79ac6ef5 | 63 | return system->ref_count++; |
6e94a780 SR |
64 | } |
65 | ||
66 | static int system_refcount_dec(struct event_subsystem *system) | |
67 | { | |
79ac6ef5 | 68 | return --system->ref_count; |
6e94a780 SR |
69 | } |
70 | ||
ae63b31e SR |
71 | /* Double loops, do not use break, only goto's work */ |
72 | #define do_for_each_event_file(tr, file) \ | |
73 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
74 | list_for_each_entry(file, &tr->events, list) | |
75 | ||
76 | #define do_for_each_event_file_safe(tr, file) \ | |
77 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
7f1d2f82 | 78 | struct trace_event_file *___n; \ |
ae63b31e SR |
79 | list_for_each_entry_safe(file, ___n, &tr->events, list) |
80 | ||
81 | #define while_for_each_event_file() \ | |
82 | } | |
83 | ||
b3a8c6fd J |
84 | static struct ftrace_event_field * |
85 | __find_event_field(struct list_head *head, char *name) | |
86 | { | |
87 | struct ftrace_event_field *field; | |
88 | ||
89 | list_for_each_entry(field, head, link) { | |
90 | if (!strcmp(field->name, name)) | |
91 | return field; | |
92 | } | |
93 | ||
94 | return NULL; | |
95 | } | |
96 | ||
97 | struct ftrace_event_field * | |
2425bcb9 | 98 | trace_find_event_field(struct trace_event_call *call, char *name) |
b3a8c6fd J |
99 | { |
100 | struct ftrace_event_field *field; | |
101 | struct list_head *head; | |
102 | ||
e57cbaf0 SRRH |
103 | head = trace_get_fields(call); |
104 | field = __find_event_field(head, name); | |
9f616680 DW |
105 | if (field) |
106 | return field; | |
107 | ||
e57cbaf0 | 108 | field = __find_event_field(&ftrace_generic_fields, name); |
b3a8c6fd J |
109 | if (field) |
110 | return field; | |
111 | ||
e57cbaf0 | 112 | return __find_event_field(&ftrace_common_fields, name); |
b3a8c6fd J |
113 | } |
114 | ||
8728fe50 LZ |
115 | static int __trace_define_field(struct list_head *head, const char *type, |
116 | const char *name, int offset, int size, | |
b6c7abd1 | 117 | int is_signed, int filter_type, int len) |
cf027f64 TZ |
118 | { |
119 | struct ftrace_event_field *field; | |
120 | ||
d1a29143 | 121 | field = kmem_cache_alloc(field_cachep, GFP_TRACE); |
cf027f64 | 122 | if (!field) |
aaf6ac0f | 123 | return -ENOMEM; |
fe9f57f2 | 124 | |
92edca07 SR |
125 | field->name = name; |
126 | field->type = type; | |
fe9f57f2 | 127 | |
43b51ead LZ |
128 | if (filter_type == FILTER_OTHER) |
129 | field->filter_type = filter_assign_type(type); | |
130 | else | |
131 | field->filter_type = filter_type; | |
132 | ||
cf027f64 TZ |
133 | field->offset = offset; |
134 | field->size = size; | |
a118e4d1 | 135 | field->is_signed = is_signed; |
b6c7abd1 | 136 | field->len = len; |
aa38e9fc | 137 | |
2e33af02 | 138 | list_add(&field->link, head); |
cf027f64 TZ |
139 | |
140 | return 0; | |
cf027f64 | 141 | } |
8728fe50 | 142 | |
2425bcb9 | 143 | int trace_define_field(struct trace_event_call *call, const char *type, |
8728fe50 LZ |
144 | const char *name, int offset, int size, int is_signed, |
145 | int filter_type) | |
146 | { | |
147 | struct list_head *head; | |
148 | ||
149 | if (WARN_ON(!call->class)) | |
150 | return 0; | |
151 | ||
152 | head = trace_get_fields(call); | |
153 | return __trace_define_field(head, type, name, offset, size, | |
b6c7abd1 | 154 | is_signed, filter_type, 0); |
8728fe50 | 155 | } |
17c873ec | 156 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 157 | |
70b5339c | 158 | static int trace_define_field_ext(struct trace_event_call *call, const char *type, |
b6c7abd1 YS |
159 | const char *name, int offset, int size, int is_signed, |
160 | int filter_type, int len) | |
161 | { | |
162 | struct list_head *head; | |
163 | ||
164 | if (WARN_ON(!call->class)) | |
165 | return 0; | |
166 | ||
167 | head = trace_get_fields(call); | |
168 | return __trace_define_field(head, type, name, offset, size, | |
169 | is_signed, filter_type, len); | |
170 | } | |
171 | ||
9f616680 DW |
172 | #define __generic_field(type, item, filter_type) \ |
173 | ret = __trace_define_field(&ftrace_generic_fields, #type, \ | |
174 | #item, 0, 0, is_signed_type(type), \ | |
b6c7abd1 | 175 | filter_type, 0); \ |
9f616680 DW |
176 | if (ret) \ |
177 | return ret; | |
178 | ||
e647d6b3 | 179 | #define __common_field(type, item) \ |
8728fe50 LZ |
180 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
181 | "common_" #item, \ | |
182 | offsetof(typeof(ent), item), \ | |
183 | sizeof(ent.item), \ | |
b6c7abd1 | 184 | is_signed_type(type), FILTER_OTHER, 0); \ |
e647d6b3 LZ |
185 | if (ret) \ |
186 | return ret; | |
187 | ||
9f616680 DW |
188 | static int trace_define_generic_fields(void) |
189 | { | |
190 | int ret; | |
191 | ||
e57cbaf0 SRRH |
192 | __generic_field(int, CPU, FILTER_CPU); |
193 | __generic_field(int, cpu, FILTER_CPU); | |
b2380577 | 194 | __generic_field(int, common_cpu, FILTER_CPU); |
e57cbaf0 SRRH |
195 | __generic_field(char *, COMM, FILTER_COMM); |
196 | __generic_field(char *, comm, FILTER_COMM); | |
9f616680 DW |
197 | |
198 | return ret; | |
199 | } | |
200 | ||
8728fe50 | 201 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
202 | { |
203 | int ret; | |
204 | struct trace_entry ent; | |
205 | ||
206 | __common_field(unsigned short, type); | |
207 | __common_field(unsigned char, flags); | |
54357f0c | 208 | /* Holds both preempt_count and migrate_disable */ |
e647d6b3 LZ |
209 | __common_field(unsigned char, preempt_count); |
210 | __common_field(int, pid); | |
e647d6b3 LZ |
211 | |
212 | return ret; | |
213 | } | |
214 | ||
2425bcb9 | 215 | static void trace_destroy_fields(struct trace_event_call *call) |
2df75e41 LZ |
216 | { |
217 | struct ftrace_event_field *field, *next; | |
2e33af02 | 218 | struct list_head *head; |
2df75e41 | 219 | |
2e33af02 SR |
220 | head = trace_get_fields(call); |
221 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 | 222 | list_del(&field->link); |
d1a29143 | 223 | kmem_cache_free(field_cachep, field); |
2df75e41 LZ |
224 | } |
225 | } | |
226 | ||
32bbe007 AS |
227 | /* |
228 | * run-time version of trace_event_get_offsets_<call>() that returns the last | |
229 | * accessible offset of trace fields excluding __dynamic_array bytes | |
230 | */ | |
231 | int trace_event_get_offsets(struct trace_event_call *call) | |
232 | { | |
233 | struct ftrace_event_field *tail; | |
234 | struct list_head *head; | |
235 | ||
236 | head = trace_get_fields(call); | |
237 | /* | |
238 | * head->next points to the last field with the largest offset, | |
239 | * since it was added last by trace_define_field() | |
240 | */ | |
241 | tail = list_first_entry(head, struct ftrace_event_field, link); | |
242 | return tail->offset + tail->size; | |
243 | } | |
244 | ||
5013f454 SRV |
245 | /* |
246 | * Check if the referenced field is an array and return true, | |
247 | * as arrays are OK to dereference. | |
248 | */ | |
249 | static bool test_field(const char *fmt, struct trace_event_call *call) | |
250 | { | |
251 | struct trace_event_fields *field = call->class->fields_array; | |
252 | const char *array_descriptor; | |
253 | const char *p = fmt; | |
254 | int len; | |
255 | ||
256 | if (!(len = str_has_prefix(fmt, "REC->"))) | |
257 | return false; | |
258 | fmt += len; | |
259 | for (p = fmt; *p; p++) { | |
260 | if (!isalnum(*p) && *p != '_') | |
261 | break; | |
262 | } | |
263 | len = p - fmt; | |
264 | ||
265 | for (; field->type; field++) { | |
266 | if (strncmp(field->name, fmt, len) || | |
267 | field->name[len]) | |
268 | continue; | |
269 | array_descriptor = strchr(field->type, '['); | |
270 | /* This is an array and is OK to dereference. */ | |
271 | return array_descriptor != NULL; | |
272 | } | |
273 | return false; | |
274 | } | |
275 | ||
276 | /* | |
277 | * Examine the print fmt of the event looking for unsafe dereference | |
278 | * pointers using %p* that could be recorded in the trace event and | |
279 | * much later referenced after the pointer was freed. Dereferencing | |
280 | * pointers are OK, if it is dereferenced into the event itself. | |
281 | */ | |
282 | static void test_event_printk(struct trace_event_call *call) | |
283 | { | |
284 | u64 dereference_flags = 0; | |
285 | bool first = true; | |
286 | const char *fmt, *c, *r, *a; | |
287 | int parens = 0; | |
288 | char in_quote = 0; | |
289 | int start_arg = 0; | |
290 | int arg = 0; | |
291 | int i; | |
292 | ||
293 | fmt = call->print_fmt; | |
294 | ||
295 | if (!fmt) | |
296 | return; | |
297 | ||
298 | for (i = 0; fmt[i]; i++) { | |
299 | switch (fmt[i]) { | |
300 | case '\\': | |
301 | i++; | |
302 | if (!fmt[i]) | |
303 | return; | |
304 | continue; | |
305 | case '"': | |
306 | case '\'': | |
307 | /* | |
308 | * The print fmt starts with a string that | |
309 | * is processed first to find %p* usage, | |
310 | * then after the first string, the print fmt | |
311 | * contains arguments that are used to check | |
312 | * if the dereferenced %p* usage is safe. | |
313 | */ | |
314 | if (first) { | |
315 | if (fmt[i] == '\'') | |
316 | continue; | |
317 | if (in_quote) { | |
318 | arg = 0; | |
319 | first = false; | |
320 | /* | |
321 | * If there was no %p* uses | |
322 | * the fmt is OK. | |
323 | */ | |
324 | if (!dereference_flags) | |
325 | return; | |
326 | } | |
327 | } | |
328 | if (in_quote) { | |
329 | if (in_quote == fmt[i]) | |
330 | in_quote = 0; | |
331 | } else { | |
332 | in_quote = fmt[i]; | |
333 | } | |
334 | continue; | |
335 | case '%': | |
336 | if (!first || !in_quote) | |
337 | continue; | |
338 | i++; | |
339 | if (!fmt[i]) | |
340 | return; | |
341 | switch (fmt[i]) { | |
342 | case '%': | |
343 | continue; | |
344 | case 'p': | |
345 | /* Find dereferencing fields */ | |
346 | switch (fmt[i + 1]) { | |
347 | case 'B': case 'R': case 'r': | |
348 | case 'b': case 'M': case 'm': | |
349 | case 'I': case 'i': case 'E': | |
350 | case 'U': case 'V': case 'N': | |
351 | case 'a': case 'd': case 'D': | |
352 | case 'g': case 't': case 'C': | |
353 | case 'O': case 'f': | |
354 | if (WARN_ONCE(arg == 63, | |
355 | "Too many args for event: %s", | |
356 | trace_event_name(call))) | |
357 | return; | |
358 | dereference_flags |= 1ULL << arg; | |
359 | } | |
360 | break; | |
361 | default: | |
362 | { | |
363 | bool star = false; | |
364 | int j; | |
365 | ||
366 | /* Increment arg if %*s exists. */ | |
367 | for (j = 0; fmt[i + j]; j++) { | |
368 | if (isdigit(fmt[i + j]) || | |
369 | fmt[i + j] == '.') | |
370 | continue; | |
371 | if (fmt[i + j] == '*') { | |
372 | star = true; | |
373 | continue; | |
374 | } | |
375 | if ((fmt[i + j] == 's') && star) | |
376 | arg++; | |
377 | break; | |
378 | } | |
379 | break; | |
380 | } /* default */ | |
381 | ||
382 | } /* switch */ | |
383 | arg++; | |
384 | continue; | |
385 | case '(': | |
386 | if (in_quote) | |
387 | continue; | |
388 | parens++; | |
389 | continue; | |
390 | case ')': | |
391 | if (in_quote) | |
392 | continue; | |
393 | parens--; | |
394 | if (WARN_ONCE(parens < 0, | |
395 | "Paren mismatch for event: %s\narg='%s'\n%*s", | |
396 | trace_event_name(call), | |
397 | fmt + start_arg, | |
398 | (i - start_arg) + 5, "^")) | |
399 | return; | |
400 | continue; | |
401 | case ',': | |
402 | if (in_quote || parens) | |
403 | continue; | |
404 | i++; | |
405 | while (isspace(fmt[i])) | |
406 | i++; | |
407 | start_arg = i; | |
408 | if (!(dereference_flags & (1ULL << arg))) | |
409 | goto next_arg; | |
410 | ||
411 | /* Find the REC-> in the argument */ | |
412 | c = strchr(fmt + i, ','); | |
413 | r = strstr(fmt + i, "REC->"); | |
414 | if (r && (!c || r < c)) { | |
415 | /* | |
416 | * Addresses of events on the buffer, | |
417 | * or an array on the buffer is | |
418 | * OK to dereference. | |
419 | * There's ways to fool this, but | |
420 | * this is to catch common mistakes, | |
421 | * not malicious code. | |
422 | */ | |
423 | a = strchr(fmt + i, '&'); | |
424 | if ((a && (a < r)) || test_field(r, call)) | |
425 | dereference_flags &= ~(1ULL << arg); | |
499f1216 SRG |
426 | } else if ((r = strstr(fmt + i, "__get_dynamic_array(")) && |
427 | (!c || r < c)) { | |
428 | dereference_flags &= ~(1ULL << arg); | |
429 | } else if ((r = strstr(fmt + i, "__get_sockaddr(")) && | |
430 | (!c || r < c)) { | |
431 | dereference_flags &= ~(1ULL << arg); | |
5013f454 | 432 | } |
499f1216 | 433 | |
5013f454 SRV |
434 | next_arg: |
435 | i--; | |
436 | arg++; | |
437 | } | |
438 | } | |
439 | ||
440 | /* | |
441 | * If you triggered the below warning, the trace event reported | |
442 | * uses an unsafe dereference pointer %p*. As the data stored | |
443 | * at the trace event time may no longer exist when the trace | |
444 | * event is printed, dereferencing to the original source is | |
445 | * unsafe. The source of the dereference must be copied into the | |
446 | * event itself, and the dereference must access the copy instead. | |
447 | */ | |
448 | if (WARN_ON_ONCE(dereference_flags)) { | |
449 | arg = 1; | |
450 | while (!(dereference_flags & 1)) { | |
451 | dereference_flags >>= 1; | |
452 | arg++; | |
453 | } | |
454 | pr_warn("event %s has unsafe dereference of argument %d\n", | |
455 | trace_event_name(call), arg); | |
456 | pr_warn("print_fmt: %s\n", fmt); | |
457 | } | |
458 | } | |
459 | ||
2425bcb9 | 460 | int trace_event_raw_init(struct trace_event_call *call) |
87d9b4e1 LZ |
461 | { |
462 | int id; | |
463 | ||
9023c930 | 464 | id = register_trace_event(&call->event); |
87d9b4e1 LZ |
465 | if (!id) |
466 | return -ENODEV; | |
87d9b4e1 | 467 | |
5013f454 SRV |
468 | test_event_printk(call); |
469 | ||
87d9b4e1 LZ |
470 | return 0; |
471 | } | |
472 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
473 | ||
3fdaf80f SRRH |
474 | bool trace_event_ignore_this_pid(struct trace_event_file *trace_file) |
475 | { | |
476 | struct trace_array *tr = trace_file->tr; | |
477 | struct trace_array_cpu *data; | |
27683626 | 478 | struct trace_pid_list *no_pid_list; |
3fdaf80f SRRH |
479 | struct trace_pid_list *pid_list; |
480 | ||
da25a672 | 481 | pid_list = rcu_dereference_raw(tr->filtered_pids); |
27683626 SRV |
482 | no_pid_list = rcu_dereference_raw(tr->filtered_no_pids); |
483 | ||
484 | if (!pid_list && !no_pid_list) | |
3fdaf80f SRRH |
485 | return false; |
486 | ||
1c5eb448 | 487 | data = this_cpu_ptr(tr->array_buffer.data); |
3fdaf80f SRRH |
488 | |
489 | return data->ignore_pid; | |
490 | } | |
491 | EXPORT_SYMBOL_GPL(trace_event_ignore_this_pid); | |
492 | ||
3f795dcf SRRH |
493 | void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer, |
494 | struct trace_event_file *trace_file, | |
495 | unsigned long len) | |
3fd40d1e | 496 | { |
2425bcb9 | 497 | struct trace_event_call *event_call = trace_file->event_call; |
3fd40d1e | 498 | |
3fdaf80f SRRH |
499 | if ((trace_file->flags & EVENT_FILE_FL_PID_FILTER) && |
500 | trace_event_ignore_this_pid(trace_file)) | |
501 | return NULL; | |
502 | ||
e947841c | 503 | /* |
30c93704 | 504 | * If CONFIG_PREEMPTION is enabled, then the tracepoint itself disables |
e947841c SRRH |
505 | * preemption (adding one to the preempt_count). Since we are |
506 | * interested in the preempt_count at the time the tracepoint was | |
507 | * hit, we need to subtract one to offset the increment. | |
508 | */ | |
36590c50 | 509 | fbuffer->trace_ctx = tracing_gen_ctx_dec(); |
7f1d2f82 | 510 | fbuffer->trace_file = trace_file; |
3fd40d1e SR |
511 | |
512 | fbuffer->event = | |
7f1d2f82 | 513 | trace_event_buffer_lock_reserve(&fbuffer->buffer, trace_file, |
3fd40d1e | 514 | event_call->event.type, len, |
36590c50 | 515 | fbuffer->trace_ctx); |
3fd40d1e SR |
516 | if (!fbuffer->event) |
517 | return NULL; | |
518 | ||
8cfcf155 | 519 | fbuffer->regs = NULL; |
3fd40d1e SR |
520 | fbuffer->entry = ring_buffer_event_data(fbuffer->event); |
521 | return fbuffer->entry; | |
522 | } | |
3f795dcf | 523 | EXPORT_SYMBOL_GPL(trace_event_buffer_reserve); |
3fd40d1e | 524 | |
2425bcb9 | 525 | int trace_event_reg(struct trace_event_call *call, |
9023c930 | 526 | enum trace_reg type, void *data) |
a1d0ce82 | 527 | { |
7f1d2f82 | 528 | struct trace_event_file *file = data; |
ae63b31e | 529 | |
de7b2973 | 530 | WARN_ON(!(call->flags & TRACE_EVENT_FL_TRACEPOINT)); |
a1d0ce82 SR |
531 | switch (type) { |
532 | case TRACE_REG_REGISTER: | |
de7b2973 | 533 | return tracepoint_probe_register(call->tp, |
a1d0ce82 | 534 | call->class->probe, |
ae63b31e | 535 | file); |
a1d0ce82 | 536 | case TRACE_REG_UNREGISTER: |
de7b2973 | 537 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 | 538 | call->class->probe, |
ae63b31e | 539 | file); |
a1d0ce82 SR |
540 | return 0; |
541 | ||
542 | #ifdef CONFIG_PERF_EVENTS | |
543 | case TRACE_REG_PERF_REGISTER: | |
de7b2973 | 544 | return tracepoint_probe_register(call->tp, |
a1d0ce82 SR |
545 | call->class->perf_probe, |
546 | call); | |
547 | case TRACE_REG_PERF_UNREGISTER: | |
de7b2973 | 548 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 SR |
549 | call->class->perf_probe, |
550 | call); | |
551 | return 0; | |
ceec0b6f JO |
552 | case TRACE_REG_PERF_OPEN: |
553 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
554 | case TRACE_REG_PERF_ADD: |
555 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 556 | return 0; |
a1d0ce82 SR |
557 | #endif |
558 | } | |
559 | return 0; | |
560 | } | |
9023c930 | 561 | EXPORT_SYMBOL_GPL(trace_event_reg); |
a1d0ce82 | 562 | |
e870e9a1 LZ |
563 | void trace_event_enable_cmd_record(bool enable) |
564 | { | |
7f1d2f82 | 565 | struct trace_event_file *file; |
ae63b31e | 566 | struct trace_array *tr; |
e870e9a1 | 567 | |
3a53acf1 PS |
568 | lockdep_assert_held(&event_mutex); |
569 | ||
ae63b31e SR |
570 | do_for_each_event_file(tr, file) { |
571 | ||
5d6ad960 | 572 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) |
e870e9a1 LZ |
573 | continue; |
574 | ||
575 | if (enable) { | |
576 | tracing_start_cmdline_record(); | |
5d6ad960 | 577 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 LZ |
578 | } else { |
579 | tracing_stop_cmdline_record(); | |
5d6ad960 | 580 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 581 | } |
ae63b31e | 582 | } while_for_each_event_file(); |
e870e9a1 LZ |
583 | } |
584 | ||
d914ba37 JF |
585 | void trace_event_enable_tgid_record(bool enable) |
586 | { | |
587 | struct trace_event_file *file; | |
588 | struct trace_array *tr; | |
589 | ||
3a53acf1 PS |
590 | lockdep_assert_held(&event_mutex); |
591 | ||
d914ba37 JF |
592 | do_for_each_event_file(tr, file) { |
593 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) | |
594 | continue; | |
595 | ||
596 | if (enable) { | |
597 | tracing_start_tgid_record(); | |
598 | set_bit(EVENT_FILE_FL_RECORDED_TGID_BIT, &file->flags); | |
599 | } else { | |
600 | tracing_stop_tgid_record(); | |
601 | clear_bit(EVENT_FILE_FL_RECORDED_TGID_BIT, | |
602 | &file->flags); | |
603 | } | |
604 | } while_for_each_event_file(); | |
d914ba37 JF |
605 | } |
606 | ||
7f1d2f82 | 607 | static int __ftrace_event_enable_disable(struct trace_event_file *file, |
417944c4 | 608 | int enable, int soft_disable) |
fd994989 | 609 | { |
2425bcb9 | 610 | struct trace_event_call *call = file->event_call; |
983f938a | 611 | struct trace_array *tr = file->tr; |
0fc1b09f | 612 | unsigned long file_flags = file->flags; |
3b8e4273 | 613 | int ret = 0; |
417944c4 | 614 | int disable; |
3b8e4273 | 615 | |
fd994989 SR |
616 | switch (enable) { |
617 | case 0: | |
417944c4 | 618 | /* |
1cf4c073 MH |
619 | * When soft_disable is set and enable is cleared, the sm_ref |
620 | * reference counter is decremented. If it reaches 0, we want | |
417944c4 SRRH |
621 | * to clear the SOFT_DISABLED flag but leave the event in the |
622 | * state that it was. That is, if the event was enabled and | |
623 | * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED | |
624 | * is set we do not want the event to be enabled before we | |
625 | * clear the bit. | |
626 | * | |
627 | * When soft_disable is not set but the SOFT_MODE flag is, | |
628 | * we do nothing. Do not disable the tracepoint, otherwise | |
629 | * "soft enable"s (clearing the SOFT_DISABLED bit) wont work. | |
630 | */ | |
631 | if (soft_disable) { | |
1cf4c073 MH |
632 | if (atomic_dec_return(&file->sm_ref) > 0) |
633 | break; | |
5d6ad960 SRRH |
634 | disable = file->flags & EVENT_FILE_FL_SOFT_DISABLED; |
635 | clear_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); | |
417944c4 | 636 | } else |
5d6ad960 | 637 | disable = !(file->flags & EVENT_FILE_FL_SOFT_MODE); |
417944c4 | 638 | |
5d6ad960 SRRH |
639 | if (disable && (file->flags & EVENT_FILE_FL_ENABLED)) { |
640 | clear_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); | |
641 | if (file->flags & EVENT_FILE_FL_RECORDED_CMD) { | |
e870e9a1 | 642 | tracing_stop_cmdline_record(); |
5d6ad960 | 643 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 644 | } |
d914ba37 JF |
645 | |
646 | if (file->flags & EVENT_FILE_FL_RECORDED_TGID) { | |
647 | tracing_stop_tgid_record(); | |
7685ab6c | 648 | clear_bit(EVENT_FILE_FL_RECORDED_TGID_BIT, &file->flags); |
d914ba37 JF |
649 | } |
650 | ||
ae63b31e | 651 | call->class->reg(call, TRACE_REG_UNREGISTER, file); |
fd994989 | 652 | } |
3baa5e4c | 653 | /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT, else clear it */ |
5d6ad960 SRRH |
654 | if (file->flags & EVENT_FILE_FL_SOFT_MODE) |
655 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); | |
3baa5e4c | 656 | else |
5d6ad960 | 657 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
fd994989 SR |
658 | break; |
659 | case 1: | |
417944c4 SRRH |
660 | /* |
661 | * When soft_disable is set and enable is set, we want to | |
662 | * register the tracepoint for the event, but leave the event | |
663 | * as is. That means, if the event was already enabled, we do | |
664 | * nothing (but set SOFT_MODE). If the event is disabled, we | |
665 | * set SOFT_DISABLED before enabling the event tracepoint, so | |
666 | * it still seems to be disabled. | |
667 | */ | |
668 | if (!soft_disable) | |
5d6ad960 | 669 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
1cf4c073 MH |
670 | else { |
671 | if (atomic_inc_return(&file->sm_ref) > 1) | |
672 | break; | |
5d6ad960 | 673 | set_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); |
1cf4c073 | 674 | } |
417944c4 | 675 | |
5d6ad960 | 676 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) { |
d914ba37 | 677 | bool cmd = false, tgid = false; |
417944c4 SRRH |
678 | |
679 | /* Keep the event disabled, when going to SOFT_MODE. */ | |
680 | if (soft_disable) | |
5d6ad960 | 681 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
417944c4 | 682 | |
983f938a | 683 | if (tr->trace_flags & TRACE_ITER_RECORD_CMD) { |
d914ba37 | 684 | cmd = true; |
e870e9a1 | 685 | tracing_start_cmdline_record(); |
5d6ad960 | 686 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 687 | } |
d914ba37 JF |
688 | |
689 | if (tr->trace_flags & TRACE_ITER_RECORD_TGID) { | |
690 | tgid = true; | |
691 | tracing_start_tgid_record(); | |
692 | set_bit(EVENT_FILE_FL_RECORDED_TGID_BIT, &file->flags); | |
693 | } | |
694 | ||
ae63b31e | 695 | ret = call->class->reg(call, TRACE_REG_REGISTER, file); |
3b8e4273 | 696 | if (ret) { |
d914ba37 JF |
697 | if (cmd) |
698 | tracing_stop_cmdline_record(); | |
699 | if (tgid) | |
700 | tracing_stop_tgid_record(); | |
3b8e4273 | 701 | pr_info("event trace: Could not enable event " |
687fcc4a | 702 | "%s\n", trace_event_name(call)); |
3b8e4273 LZ |
703 | break; |
704 | } | |
5d6ad960 | 705 | set_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); |
575380da SRRH |
706 | |
707 | /* WAS_ENABLED gets set but never cleared. */ | |
065e63f9 | 708 | set_bit(EVENT_FILE_FL_WAS_ENABLED_BIT, &file->flags); |
fd994989 | 709 | } |
fd994989 SR |
710 | break; |
711 | } | |
3b8e4273 | 712 | |
0fc1b09f SRRH |
713 | /* Enable or disable use of trace_buffered_event */ |
714 | if ((file_flags & EVENT_FILE_FL_SOFT_DISABLED) != | |
715 | (file->flags & EVENT_FILE_FL_SOFT_DISABLED)) { | |
716 | if (file->flags & EVENT_FILE_FL_SOFT_DISABLED) | |
717 | trace_buffered_event_enable(); | |
718 | else | |
719 | trace_buffered_event_disable(); | |
720 | } | |
721 | ||
3b8e4273 | 722 | return ret; |
fd994989 SR |
723 | } |
724 | ||
7f1d2f82 | 725 | int trace_event_enable_disable(struct trace_event_file *file, |
85f2b082 TZ |
726 | int enable, int soft_disable) |
727 | { | |
728 | return __ftrace_event_enable_disable(file, enable, soft_disable); | |
729 | } | |
730 | ||
7f1d2f82 | 731 | static int ftrace_event_enable_disable(struct trace_event_file *file, |
417944c4 SRRH |
732 | int enable) |
733 | { | |
734 | return __ftrace_event_enable_disable(file, enable, 0); | |
735 | } | |
736 | ||
ae63b31e | 737 | static void ftrace_clear_events(struct trace_array *tr) |
0e907c99 | 738 | { |
7f1d2f82 | 739 | struct trace_event_file *file; |
0e907c99 Z |
740 | |
741 | mutex_lock(&event_mutex); | |
ae63b31e SR |
742 | list_for_each_entry(file, &tr->events, list) { |
743 | ftrace_event_enable_disable(file, 0); | |
0e907c99 Z |
744 | } |
745 | mutex_unlock(&event_mutex); | |
746 | } | |
747 | ||
c37775d5 SR |
748 | static void |
749 | event_filter_pid_sched_process_exit(void *data, struct task_struct *task) | |
750 | { | |
751 | struct trace_pid_list *pid_list; | |
752 | struct trace_array *tr = data; | |
753 | ||
da25a672 | 754 | pid_list = rcu_dereference_raw(tr->filtered_pids); |
4e267db1 | 755 | trace_filter_add_remove_task(pid_list, NULL, task); |
27683626 SRV |
756 | |
757 | pid_list = rcu_dereference_raw(tr->filtered_no_pids); | |
758 | trace_filter_add_remove_task(pid_list, NULL, task); | |
c37775d5 SR |
759 | } |
760 | ||
761 | static void | |
762 | event_filter_pid_sched_process_fork(void *data, | |
763 | struct task_struct *self, | |
764 | struct task_struct *task) | |
765 | { | |
766 | struct trace_pid_list *pid_list; | |
767 | struct trace_array *tr = data; | |
768 | ||
769 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
4e267db1 | 770 | trace_filter_add_remove_task(pid_list, self, task); |
27683626 SRV |
771 | |
772 | pid_list = rcu_dereference_sched(tr->filtered_no_pids); | |
773 | trace_filter_add_remove_task(pid_list, self, task); | |
c37775d5 SR |
774 | } |
775 | ||
776 | void trace_event_follow_fork(struct trace_array *tr, bool enable) | |
777 | { | |
778 | if (enable) { | |
779 | register_trace_prio_sched_process_fork(event_filter_pid_sched_process_fork, | |
780 | tr, INT_MIN); | |
afcab636 | 781 | register_trace_prio_sched_process_free(event_filter_pid_sched_process_exit, |
c37775d5 SR |
782 | tr, INT_MAX); |
783 | } else { | |
784 | unregister_trace_sched_process_fork(event_filter_pid_sched_process_fork, | |
785 | tr); | |
afcab636 | 786 | unregister_trace_sched_process_free(event_filter_pid_sched_process_exit, |
c37775d5 SR |
787 | tr); |
788 | } | |
3fdaf80f SRRH |
789 | } |
790 | ||
791 | static void | |
22402cd0 | 792 | event_filter_pid_sched_switch_probe_pre(void *data, bool preempt, |
fa2c3254 | 793 | struct task_struct *prev, |
9c2136be DK |
794 | struct task_struct *next, |
795 | unsigned int prev_state) | |
3fdaf80f SRRH |
796 | { |
797 | struct trace_array *tr = data; | |
27683626 | 798 | struct trace_pid_list *no_pid_list; |
3fdaf80f | 799 | struct trace_pid_list *pid_list; |
27683626 | 800 | bool ret; |
3fdaf80f SRRH |
801 | |
802 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
27683626 | 803 | no_pid_list = rcu_dereference_sched(tr->filtered_no_pids); |
3fdaf80f | 804 | |
27683626 SRV |
805 | /* |
806 | * Sched switch is funny, as we only want to ignore it | |
807 | * in the notrace case if both prev and next should be ignored. | |
808 | */ | |
809 | ret = trace_ignore_this_task(NULL, no_pid_list, prev) && | |
810 | trace_ignore_this_task(NULL, no_pid_list, next); | |
811 | ||
812 | this_cpu_write(tr->array_buffer.data->ignore_pid, ret || | |
813 | (trace_ignore_this_task(pid_list, NULL, prev) && | |
814 | trace_ignore_this_task(pid_list, NULL, next))); | |
3fdaf80f SRRH |
815 | } |
816 | ||
817 | static void | |
22402cd0 | 818 | event_filter_pid_sched_switch_probe_post(void *data, bool preempt, |
fa2c3254 | 819 | struct task_struct *prev, |
9c2136be DK |
820 | struct task_struct *next, |
821 | unsigned int prev_state) | |
3fdaf80f SRRH |
822 | { |
823 | struct trace_array *tr = data; | |
27683626 | 824 | struct trace_pid_list *no_pid_list; |
3fdaf80f SRRH |
825 | struct trace_pid_list *pid_list; |
826 | ||
827 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
27683626 | 828 | no_pid_list = rcu_dereference_sched(tr->filtered_no_pids); |
3fdaf80f | 829 | |
1c5eb448 | 830 | this_cpu_write(tr->array_buffer.data->ignore_pid, |
27683626 | 831 | trace_ignore_this_task(pid_list, no_pid_list, next)); |
3fdaf80f SRRH |
832 | } |
833 | ||
834 | static void | |
835 | event_filter_pid_sched_wakeup_probe_pre(void *data, struct task_struct *task) | |
836 | { | |
837 | struct trace_array *tr = data; | |
27683626 | 838 | struct trace_pid_list *no_pid_list; |
3fdaf80f SRRH |
839 | struct trace_pid_list *pid_list; |
840 | ||
841 | /* Nothing to do if we are already tracing */ | |
1c5eb448 | 842 | if (!this_cpu_read(tr->array_buffer.data->ignore_pid)) |
3fdaf80f SRRH |
843 | return; |
844 | ||
845 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
27683626 | 846 | no_pid_list = rcu_dereference_sched(tr->filtered_no_pids); |
3fdaf80f | 847 | |
1c5eb448 | 848 | this_cpu_write(tr->array_buffer.data->ignore_pid, |
27683626 | 849 | trace_ignore_this_task(pid_list, no_pid_list, task)); |
3fdaf80f SRRH |
850 | } |
851 | ||
852 | static void | |
853 | event_filter_pid_sched_wakeup_probe_post(void *data, struct task_struct *task) | |
854 | { | |
855 | struct trace_array *tr = data; | |
27683626 | 856 | struct trace_pid_list *no_pid_list; |
3fdaf80f SRRH |
857 | struct trace_pid_list *pid_list; |
858 | ||
859 | /* Nothing to do if we are not tracing */ | |
1c5eb448 | 860 | if (this_cpu_read(tr->array_buffer.data->ignore_pid)) |
3fdaf80f SRRH |
861 | return; |
862 | ||
863 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
27683626 | 864 | no_pid_list = rcu_dereference_sched(tr->filtered_no_pids); |
3fdaf80f SRRH |
865 | |
866 | /* Set tracing if current is enabled */ | |
1c5eb448 | 867 | this_cpu_write(tr->array_buffer.data->ignore_pid, |
27683626 | 868 | trace_ignore_this_task(pid_list, no_pid_list, current)); |
3fdaf80f SRRH |
869 | } |
870 | ||
27683626 | 871 | static void unregister_pid_events(struct trace_array *tr) |
49090107 | 872 | { |
3fdaf80f SRRH |
873 | unregister_trace_sched_switch(event_filter_pid_sched_switch_probe_pre, tr); |
874 | unregister_trace_sched_switch(event_filter_pid_sched_switch_probe_post, tr); | |
875 | ||
876 | unregister_trace_sched_wakeup(event_filter_pid_sched_wakeup_probe_pre, tr); | |
877 | unregister_trace_sched_wakeup(event_filter_pid_sched_wakeup_probe_post, tr); | |
878 | ||
0f72e37e SRRH |
879 | unregister_trace_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_pre, tr); |
880 | unregister_trace_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_post, tr); | |
881 | ||
882 | unregister_trace_sched_waking(event_filter_pid_sched_wakeup_probe_pre, tr); | |
883 | unregister_trace_sched_waking(event_filter_pid_sched_wakeup_probe_post, tr); | |
27683626 | 884 | } |
0f72e37e | 885 | |
27683626 SRV |
886 | static void __ftrace_clear_event_pids(struct trace_array *tr, int type) |
887 | { | |
888 | struct trace_pid_list *pid_list; | |
889 | struct trace_pid_list *no_pid_list; | |
890 | struct trace_event_file *file; | |
891 | int cpu; | |
892 | ||
893 | pid_list = rcu_dereference_protected(tr->filtered_pids, | |
894 | lockdep_is_held(&event_mutex)); | |
895 | no_pid_list = rcu_dereference_protected(tr->filtered_no_pids, | |
896 | lockdep_is_held(&event_mutex)); | |
897 | ||
898 | /* Make sure there's something to do */ | |
899 | if (!pid_type_enabled(type, pid_list, no_pid_list)) | |
900 | return; | |
901 | ||
902 | if (!still_need_pid_events(type, pid_list, no_pid_list)) { | |
903 | unregister_pid_events(tr); | |
904 | ||
905 | list_for_each_entry(file, &tr->events, list) { | |
906 | clear_bit(EVENT_FILE_FL_PID_FILTER_BIT, &file->flags); | |
907 | } | |
908 | ||
909 | for_each_possible_cpu(cpu) | |
910 | per_cpu_ptr(tr->array_buffer.data, cpu)->ignore_pid = false; | |
3fdaf80f SRRH |
911 | } |
912 | ||
27683626 SRV |
913 | if (type & TRACE_PIDS) |
914 | rcu_assign_pointer(tr->filtered_pids, NULL); | |
3fdaf80f | 915 | |
27683626 SRV |
916 | if (type & TRACE_NO_PIDS) |
917 | rcu_assign_pointer(tr->filtered_no_pids, NULL); | |
49090107 SRRH |
918 | |
919 | /* Wait till all users are no longer using pid filtering */ | |
e0a568dc | 920 | tracepoint_synchronize_unregister(); |
49090107 | 921 | |
27683626 | 922 | if ((type & TRACE_PIDS) && pid_list) |
6954e415 | 923 | trace_pid_list_free(pid_list); |
27683626 SRV |
924 | |
925 | if ((type & TRACE_NO_PIDS) && no_pid_list) | |
6954e415 | 926 | trace_pid_list_free(no_pid_list); |
49090107 SRRH |
927 | } |
928 | ||
27683626 | 929 | static void ftrace_clear_event_pids(struct trace_array *tr, int type) |
49090107 SRRH |
930 | { |
931 | mutex_lock(&event_mutex); | |
27683626 | 932 | __ftrace_clear_event_pids(tr, type); |
49090107 SRRH |
933 | mutex_unlock(&event_mutex); |
934 | } | |
935 | ||
e9dbfae5 SR |
936 | static void __put_system(struct event_subsystem *system) |
937 | { | |
938 | struct event_filter *filter = system->filter; | |
939 | ||
6e94a780 SR |
940 | WARN_ON_ONCE(system_refcount(system) == 0); |
941 | if (system_refcount_dec(system)) | |
e9dbfae5 SR |
942 | return; |
943 | ||
ae63b31e SR |
944 | list_del(&system->list); |
945 | ||
e9dbfae5 SR |
946 | if (filter) { |
947 | kfree(filter->filter_string); | |
948 | kfree(filter); | |
949 | } | |
79ac6ef5 | 950 | kfree_const(system->name); |
e9dbfae5 SR |
951 | kfree(system); |
952 | } | |
953 | ||
954 | static void __get_system(struct event_subsystem *system) | |
955 | { | |
6e94a780 SR |
956 | WARN_ON_ONCE(system_refcount(system) == 0); |
957 | system_refcount_inc(system); | |
e9dbfae5 SR |
958 | } |
959 | ||
7967b3e0 | 960 | static void __get_system_dir(struct trace_subsystem_dir *dir) |
ae63b31e SR |
961 | { |
962 | WARN_ON_ONCE(dir->ref_count == 0); | |
963 | dir->ref_count++; | |
964 | __get_system(dir->subsystem); | |
965 | } | |
966 | ||
7967b3e0 | 967 | static void __put_system_dir(struct trace_subsystem_dir *dir) |
ae63b31e SR |
968 | { |
969 | WARN_ON_ONCE(dir->ref_count == 0); | |
970 | /* If the subsystem is about to be freed, the dir must be too */ | |
6e94a780 | 971 | WARN_ON_ONCE(system_refcount(dir->subsystem) == 1 && dir->ref_count != 1); |
ae63b31e SR |
972 | |
973 | __put_system(dir->subsystem); | |
974 | if (!--dir->ref_count) | |
975 | kfree(dir); | |
976 | } | |
977 | ||
7967b3e0 | 978 | static void put_system(struct trace_subsystem_dir *dir) |
e9dbfae5 SR |
979 | { |
980 | mutex_lock(&event_mutex); | |
ae63b31e | 981 | __put_system_dir(dir); |
e9dbfae5 SR |
982 | mutex_unlock(&event_mutex); |
983 | } | |
984 | ||
7967b3e0 | 985 | static void remove_subsystem(struct trace_subsystem_dir *dir) |
f6a84bdc ON |
986 | { |
987 | if (!dir) | |
988 | return; | |
989 | ||
990 | if (!--dir->nr_events) { | |
a3d1e7eb | 991 | tracefs_remove(dir->entry); |
f6a84bdc ON |
992 | list_del(&dir->list); |
993 | __put_system_dir(dir); | |
994 | } | |
995 | } | |
996 | ||
7f1d2f82 | 997 | static void remove_event_file_dir(struct trace_event_file *file) |
f6a84bdc | 998 | { |
bf682c31 ON |
999 | struct dentry *dir = file->dir; |
1000 | struct dentry *child; | |
1001 | ||
1002 | if (dir) { | |
1003 | spin_lock(&dir->d_lock); /* probably unneeded */ | |
946e51f2 | 1004 | list_for_each_entry(child, &dir->d_subdirs, d_child) { |
7682c918 DH |
1005 | if (d_really_is_positive(child)) /* probably unneeded */ |
1006 | d_inode(child)->i_private = NULL; | |
bf682c31 ON |
1007 | } |
1008 | spin_unlock(&dir->d_lock); | |
1009 | ||
a3d1e7eb | 1010 | tracefs_remove(dir); |
bf682c31 ON |
1011 | } |
1012 | ||
f6a84bdc | 1013 | list_del(&file->list); |
f6a84bdc | 1014 | remove_subsystem(file->system); |
2448e349 | 1015 | free_event_filter(file->filter); |
f6a84bdc ON |
1016 | kmem_cache_free(file_cachep, file); |
1017 | } | |
1018 | ||
8f31bfe5 LZ |
1019 | /* |
1020 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
1021 | */ | |
2a6c24af SRRH |
1022 | static int |
1023 | __ftrace_set_clr_event_nolock(struct trace_array *tr, const char *match, | |
1024 | const char *sub, const char *event, int set) | |
b77e38aa | 1025 | { |
7f1d2f82 | 1026 | struct trace_event_file *file; |
2425bcb9 | 1027 | struct trace_event_call *call; |
de7b2973 | 1028 | const char *name; |
29f93943 | 1029 | int ret = -EINVAL; |
989a0a3d | 1030 | int eret = 0; |
8f31bfe5 | 1031 | |
ae63b31e SR |
1032 | list_for_each_entry(file, &tr->events, list) { |
1033 | ||
1034 | call = file->event_call; | |
687fcc4a | 1035 | name = trace_event_name(call); |
8f31bfe5 | 1036 | |
de7b2973 | 1037 | if (!name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
1038 | continue; |
1039 | ||
9b63776f SR |
1040 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
1041 | continue; | |
1042 | ||
8f31bfe5 | 1043 | if (match && |
de7b2973 | 1044 | strcmp(match, name) != 0 && |
8f082018 | 1045 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
1046 | continue; |
1047 | ||
8f082018 | 1048 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
1049 | continue; |
1050 | ||
de7b2973 | 1051 | if (event && strcmp(event, name) != 0) |
8f31bfe5 LZ |
1052 | continue; |
1053 | ||
989a0a3d | 1054 | ret = ftrace_event_enable_disable(file, set); |
8f31bfe5 | 1055 | |
989a0a3d SRRH |
1056 | /* |
1057 | * Save the first error and return that. Some events | |
1058 | * may still have been enabled, but let the user | |
1059 | * know that something went wrong. | |
1060 | */ | |
1061 | if (ret && !eret) | |
1062 | eret = ret; | |
1063 | ||
1064 | ret = eret; | |
8f31bfe5 | 1065 | } |
2a6c24af SRRH |
1066 | |
1067 | return ret; | |
1068 | } | |
1069 | ||
1070 | static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, | |
1071 | const char *sub, const char *event, int set) | |
1072 | { | |
1073 | int ret; | |
1074 | ||
1075 | mutex_lock(&event_mutex); | |
1076 | ret = __ftrace_set_clr_event_nolock(tr, match, sub, event, set); | |
8f31bfe5 LZ |
1077 | mutex_unlock(&event_mutex); |
1078 | ||
1079 | return ret; | |
1080 | } | |
1081 | ||
595a438c | 1082 | int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set) |
8f31bfe5 | 1083 | { |
b628b3e6 | 1084 | char *event = NULL, *sub = NULL, *match; |
84fce9db | 1085 | int ret; |
b628b3e6 | 1086 | |
953ae45a DI |
1087 | if (!tr) |
1088 | return -ENOENT; | |
b628b3e6 SR |
1089 | /* |
1090 | * The buf format can be <subsystem>:<event-name> | |
1091 | * *:<event-name> means any event by that name. | |
1092 | * :<event-name> is the same. | |
1093 | * | |
1094 | * <subsystem>:* means all events in that subsystem | |
1095 | * <subsystem>: means the same. | |
1096 | * | |
1097 | * <name> (no ':') means all events in a subsystem with | |
1098 | * the name <name> or any event that matches <name> | |
1099 | */ | |
1100 | ||
1101 | match = strsep(&buf, ":"); | |
1102 | if (buf) { | |
1103 | sub = match; | |
1104 | event = buf; | |
1105 | match = NULL; | |
1106 | ||
1107 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
1108 | sub = NULL; | |
1109 | if (!strlen(event) || strcmp(event, "*") == 0) | |
1110 | event = NULL; | |
1111 | } | |
b77e38aa | 1112 | |
84fce9db JK |
1113 | ret = __ftrace_set_clr_event(tr, match, sub, event, set); |
1114 | ||
1115 | /* Put back the colon to allow this to be called again */ | |
1116 | if (buf) | |
1117 | *(buf - 1) = ':'; | |
1118 | ||
1119 | return ret; | |
b77e38aa SR |
1120 | } |
1121 | ||
4671c794 SR |
1122 | /** |
1123 | * trace_set_clr_event - enable or disable an event | |
1124 | * @system: system name to match (NULL for any system) | |
1125 | * @event: event name to match (NULL for all events, within system) | |
1126 | * @set: 1 to enable, 0 to disable | |
1127 | * | |
1128 | * This is a way for other parts of the kernel to enable or disable | |
1129 | * event recording. | |
1130 | * | |
1131 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
1132 | * registered events. | |
1133 | */ | |
1134 | int trace_set_clr_event(const char *system, const char *event, int set) | |
1135 | { | |
ae63b31e SR |
1136 | struct trace_array *tr = top_trace_array(); |
1137 | ||
dc81e5e3 YY |
1138 | if (!tr) |
1139 | return -ENODEV; | |
1140 | ||
ae63b31e | 1141 | return __ftrace_set_clr_event(tr, NULL, system, event, set); |
4671c794 | 1142 | } |
56355b83 | 1143 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 1144 | |
28879787 DI |
1145 | /** |
1146 | * trace_array_set_clr_event - enable or disable an event for a trace array. | |
1147 | * @tr: concerned trace array. | |
1148 | * @system: system name to match (NULL for any system) | |
1149 | * @event: event name to match (NULL for all events, within system) | |
1150 | * @enable: true to enable, false to disable | |
1151 | * | |
1152 | * This is a way for other parts of the kernel to enable or disable | |
1153 | * event recording. | |
1154 | * | |
1155 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
1156 | * registered events. | |
1157 | */ | |
1158 | int trace_array_set_clr_event(struct trace_array *tr, const char *system, | |
1159 | const char *event, bool enable) | |
1160 | { | |
1161 | int set; | |
1162 | ||
1163 | if (!tr) | |
1164 | return -ENOENT; | |
1165 | ||
1166 | set = (enable == true) ? 1 : 0; | |
1167 | return __ftrace_set_clr_event(tr, NULL, system, event, set); | |
1168 | } | |
1169 | EXPORT_SYMBOL_GPL(trace_array_set_clr_event); | |
1170 | ||
b77e38aa SR |
1171 | /* 128 should be much more than enough */ |
1172 | #define EVENT_BUF_SIZE 127 | |
1173 | ||
1174 | static ssize_t | |
1175 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
1176 | size_t cnt, loff_t *ppos) | |
1177 | { | |
48966364 | 1178 | struct trace_parser parser; |
ae63b31e SR |
1179 | struct seq_file *m = file->private_data; |
1180 | struct trace_array *tr = m->private; | |
4ba7978e | 1181 | ssize_t read, ret; |
b77e38aa | 1182 | |
4ba7978e | 1183 | if (!cnt) |
b77e38aa SR |
1184 | return 0; |
1185 | ||
1852fcce SR |
1186 | ret = tracing_update_buffers(); |
1187 | if (ret < 0) | |
1188 | return ret; | |
1189 | ||
48966364 | 1190 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
1191 | return -ENOMEM; |
1192 | ||
48966364 | 1193 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
1194 | ||
4ba7978e | 1195 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 1196 | int set = 1; |
b77e38aa | 1197 | |
48966364 | 1198 | if (*parser.buffer == '!') |
b77e38aa | 1199 | set = 0; |
b77e38aa | 1200 | |
ae63b31e | 1201 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
b77e38aa | 1202 | if (ret) |
48966364 | 1203 | goto out_put; |
b77e38aa | 1204 | } |
b77e38aa SR |
1205 | |
1206 | ret = read; | |
1207 | ||
48966364 | 1208 | out_put: |
1209 | trace_parser_put(&parser); | |
b77e38aa SR |
1210 | |
1211 | return ret; | |
1212 | } | |
1213 | ||
1214 | static void * | |
1215 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
1216 | { | |
7f1d2f82 | 1217 | struct trace_event_file *file = v; |
2425bcb9 | 1218 | struct trace_event_call *call; |
ae63b31e | 1219 | struct trace_array *tr = m->private; |
b77e38aa SR |
1220 | |
1221 | (*pos)++; | |
1222 | ||
ae63b31e SR |
1223 | list_for_each_entry_continue(file, &tr->events, list) { |
1224 | call = file->event_call; | |
40e26815 SR |
1225 | /* |
1226 | * The ftrace subsystem is for showing formats only. | |
1227 | * They can not be enabled or disabled via the event files. | |
1228 | */ | |
d045437a SRRH |
1229 | if (call->class && call->class->reg && |
1230 | !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) | |
ae63b31e | 1231 | return file; |
40e26815 | 1232 | } |
b77e38aa | 1233 | |
30bd39cd | 1234 | return NULL; |
b77e38aa SR |
1235 | } |
1236 | ||
1237 | static void *t_start(struct seq_file *m, loff_t *pos) | |
1238 | { | |
7f1d2f82 | 1239 | struct trace_event_file *file; |
ae63b31e | 1240 | struct trace_array *tr = m->private; |
e1c7e2a6 LZ |
1241 | loff_t l; |
1242 | ||
20c8928a | 1243 | mutex_lock(&event_mutex); |
e1c7e2a6 | 1244 | |
7f1d2f82 | 1245 | file = list_entry(&tr->events, struct trace_event_file, list); |
e1c7e2a6 | 1246 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
1247 | file = t_next(m, file, &l); |
1248 | if (!file) | |
e1c7e2a6 LZ |
1249 | break; |
1250 | } | |
ae63b31e | 1251 | return file; |
b77e38aa SR |
1252 | } |
1253 | ||
1254 | static void * | |
1255 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
1256 | { | |
7f1d2f82 | 1257 | struct trace_event_file *file = v; |
ae63b31e | 1258 | struct trace_array *tr = m->private; |
b77e38aa SR |
1259 | |
1260 | (*pos)++; | |
1261 | ||
ae63b31e | 1262 | list_for_each_entry_continue(file, &tr->events, list) { |
5d6ad960 | 1263 | if (file->flags & EVENT_FILE_FL_ENABLED) |
ae63b31e | 1264 | return file; |
b77e38aa SR |
1265 | } |
1266 | ||
30bd39cd | 1267 | return NULL; |
b77e38aa SR |
1268 | } |
1269 | ||
1270 | static void *s_start(struct seq_file *m, loff_t *pos) | |
1271 | { | |
7f1d2f82 | 1272 | struct trace_event_file *file; |
ae63b31e | 1273 | struct trace_array *tr = m->private; |
e1c7e2a6 LZ |
1274 | loff_t l; |
1275 | ||
20c8928a | 1276 | mutex_lock(&event_mutex); |
e1c7e2a6 | 1277 | |
7f1d2f82 | 1278 | file = list_entry(&tr->events, struct trace_event_file, list); |
e1c7e2a6 | 1279 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
1280 | file = s_next(m, file, &l); |
1281 | if (!file) | |
e1c7e2a6 LZ |
1282 | break; |
1283 | } | |
ae63b31e | 1284 | return file; |
b77e38aa SR |
1285 | } |
1286 | ||
1287 | static int t_show(struct seq_file *m, void *v) | |
1288 | { | |
7f1d2f82 | 1289 | struct trace_event_file *file = v; |
2425bcb9 | 1290 | struct trace_event_call *call = file->event_call; |
b77e38aa | 1291 | |
8f082018 SR |
1292 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
1293 | seq_printf(m, "%s:", call->class->system); | |
687fcc4a | 1294 | seq_printf(m, "%s\n", trace_event_name(call)); |
b77e38aa SR |
1295 | |
1296 | return 0; | |
1297 | } | |
1298 | ||
1299 | static void t_stop(struct seq_file *m, void *p) | |
1300 | { | |
20c8928a | 1301 | mutex_unlock(&event_mutex); |
b77e38aa SR |
1302 | } |
1303 | ||
f4d34a87 | 1304 | static void * |
27683626 | 1305 | __next(struct seq_file *m, void *v, loff_t *pos, int type) |
f4d34a87 SR |
1306 | { |
1307 | struct trace_array *tr = m->private; | |
27683626 SRV |
1308 | struct trace_pid_list *pid_list; |
1309 | ||
1310 | if (type == TRACE_PIDS) | |
1311 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
1312 | else | |
1313 | pid_list = rcu_dereference_sched(tr->filtered_no_pids); | |
f4d34a87 | 1314 | |
5cc8976b | 1315 | return trace_pid_next(pid_list, v, pos); |
f4d34a87 SR |
1316 | } |
1317 | ||
27683626 SRV |
1318 | static void * |
1319 | p_next(struct seq_file *m, void *v, loff_t *pos) | |
1320 | { | |
1321 | return __next(m, v, pos, TRACE_PIDS); | |
1322 | } | |
1323 | ||
1324 | static void * | |
1325 | np_next(struct seq_file *m, void *v, loff_t *pos) | |
1326 | { | |
1327 | return __next(m, v, pos, TRACE_NO_PIDS); | |
1328 | } | |
1329 | ||
1330 | static void *__start(struct seq_file *m, loff_t *pos, int type) | |
fb662288 | 1331 | __acquires(RCU) |
49090107 SRRH |
1332 | { |
1333 | struct trace_pid_list *pid_list; | |
1334 | struct trace_array *tr = m->private; | |
1335 | ||
1336 | /* | |
1337 | * Grab the mutex, to keep calls to p_next() having the same | |
1338 | * tr->filtered_pids as p_start() has. | |
1339 | * If we just passed the tr->filtered_pids around, then RCU would | |
1340 | * have been enough, but doing that makes things more complex. | |
1341 | */ | |
1342 | mutex_lock(&event_mutex); | |
1343 | rcu_read_lock_sched(); | |
1344 | ||
27683626 SRV |
1345 | if (type == TRACE_PIDS) |
1346 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
1347 | else | |
1348 | pid_list = rcu_dereference_sched(tr->filtered_no_pids); | |
49090107 | 1349 | |
f4d34a87 | 1350 | if (!pid_list) |
49090107 SRRH |
1351 | return NULL; |
1352 | ||
5cc8976b | 1353 | return trace_pid_start(pid_list, pos); |
49090107 SRRH |
1354 | } |
1355 | ||
27683626 SRV |
1356 | static void *p_start(struct seq_file *m, loff_t *pos) |
1357 | __acquires(RCU) | |
1358 | { | |
1359 | return __start(m, pos, TRACE_PIDS); | |
1360 | } | |
1361 | ||
1362 | static void *np_start(struct seq_file *m, loff_t *pos) | |
1363 | __acquires(RCU) | |
1364 | { | |
1365 | return __start(m, pos, TRACE_NO_PIDS); | |
1366 | } | |
1367 | ||
49090107 | 1368 | static void p_stop(struct seq_file *m, void *p) |
fb662288 | 1369 | __releases(RCU) |
49090107 SRRH |
1370 | { |
1371 | rcu_read_unlock_sched(); | |
1372 | mutex_unlock(&event_mutex); | |
1373 | } | |
1374 | ||
1473e441 SR |
1375 | static ssize_t |
1376 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1377 | loff_t *ppos) | |
1378 | { | |
7f1d2f82 | 1379 | struct trace_event_file *file; |
bc6f6b08 | 1380 | unsigned long flags; |
a4390596 TZ |
1381 | char buf[4] = "0"; |
1382 | ||
bc6f6b08 ON |
1383 | mutex_lock(&event_mutex); |
1384 | file = event_file_data(filp); | |
1385 | if (likely(file)) | |
1386 | flags = file->flags; | |
1387 | mutex_unlock(&event_mutex); | |
1388 | ||
1389 | if (!file) | |
1390 | return -ENODEV; | |
1391 | ||
5d6ad960 SRRH |
1392 | if (flags & EVENT_FILE_FL_ENABLED && |
1393 | !(flags & EVENT_FILE_FL_SOFT_DISABLED)) | |
a4390596 TZ |
1394 | strcpy(buf, "1"); |
1395 | ||
5d6ad960 SRRH |
1396 | if (flags & EVENT_FILE_FL_SOFT_DISABLED || |
1397 | flags & EVENT_FILE_FL_SOFT_MODE) | |
a4390596 TZ |
1398 | strcat(buf, "*"); |
1399 | ||
1400 | strcat(buf, "\n"); | |
1473e441 | 1401 | |
417944c4 | 1402 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf)); |
1473e441 SR |
1403 | } |
1404 | ||
1405 | static ssize_t | |
1406 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1407 | loff_t *ppos) | |
1408 | { | |
7f1d2f82 | 1409 | struct trace_event_file *file; |
1473e441 SR |
1410 | unsigned long val; |
1411 | int ret; | |
1412 | ||
22fe9b54 PH |
1413 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
1414 | if (ret) | |
1473e441 SR |
1415 | return ret; |
1416 | ||
1852fcce SR |
1417 | ret = tracing_update_buffers(); |
1418 | if (ret < 0) | |
1419 | return ret; | |
1420 | ||
1473e441 SR |
1421 | switch (val) { |
1422 | case 0: | |
1473e441 | 1423 | case 1: |
bc6f6b08 | 1424 | ret = -ENODEV; |
11a241a3 | 1425 | mutex_lock(&event_mutex); |
bc6f6b08 ON |
1426 | file = event_file_data(filp); |
1427 | if (likely(file)) | |
1428 | ret = ftrace_event_enable_disable(file, val); | |
11a241a3 | 1429 | mutex_unlock(&event_mutex); |
1473e441 SR |
1430 | break; |
1431 | ||
1432 | default: | |
1433 | return -EINVAL; | |
1434 | } | |
1435 | ||
1436 | *ppos += cnt; | |
1437 | ||
3b8e4273 | 1438 | return ret ? ret : cnt; |
1473e441 SR |
1439 | } |
1440 | ||
8ae79a13 SR |
1441 | static ssize_t |
1442 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1443 | loff_t *ppos) | |
1444 | { | |
c142b15d | 1445 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
7967b3e0 | 1446 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1447 | struct event_subsystem *system = dir->subsystem; |
2425bcb9 | 1448 | struct trace_event_call *call; |
7f1d2f82 | 1449 | struct trace_event_file *file; |
ae63b31e | 1450 | struct trace_array *tr = dir->tr; |
8ae79a13 | 1451 | char buf[2]; |
c142b15d | 1452 | int set = 0; |
8ae79a13 SR |
1453 | int ret; |
1454 | ||
8ae79a13 | 1455 | mutex_lock(&event_mutex); |
ae63b31e SR |
1456 | list_for_each_entry(file, &tr->events, list) { |
1457 | call = file->event_call; | |
256cfdd6 SRV |
1458 | if ((call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) || |
1459 | !trace_event_name(call) || !call->class || !call->class->reg) | |
8ae79a13 SR |
1460 | continue; |
1461 | ||
40ee4dff | 1462 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
1463 | continue; |
1464 | ||
1465 | /* | |
1466 | * We need to find out if all the events are set | |
1467 | * or if all events or cleared, or if we have | |
1468 | * a mixture. | |
1469 | */ | |
5d6ad960 | 1470 | set |= (1 << !!(file->flags & EVENT_FILE_FL_ENABLED)); |
c142b15d | 1471 | |
8ae79a13 SR |
1472 | /* |
1473 | * If we have a mixture, no need to look further. | |
1474 | */ | |
c142b15d | 1475 | if (set == 3) |
8ae79a13 SR |
1476 | break; |
1477 | } | |
1478 | mutex_unlock(&event_mutex); | |
1479 | ||
c142b15d | 1480 | buf[0] = set_to_char[set]; |
8ae79a13 | 1481 | buf[1] = '\n'; |
8ae79a13 SR |
1482 | |
1483 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
1484 | ||
1485 | return ret; | |
1486 | } | |
1487 | ||
1488 | static ssize_t | |
1489 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1490 | loff_t *ppos) | |
1491 | { | |
7967b3e0 | 1492 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1493 | struct event_subsystem *system = dir->subsystem; |
40ee4dff | 1494 | const char *name = NULL; |
8ae79a13 | 1495 | unsigned long val; |
8ae79a13 SR |
1496 | ssize_t ret; |
1497 | ||
22fe9b54 PH |
1498 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
1499 | if (ret) | |
8ae79a13 SR |
1500 | return ret; |
1501 | ||
1502 | ret = tracing_update_buffers(); | |
1503 | if (ret < 0) | |
1504 | return ret; | |
1505 | ||
8f31bfe5 | 1506 | if (val != 0 && val != 1) |
8ae79a13 | 1507 | return -EINVAL; |
8ae79a13 | 1508 | |
40ee4dff SR |
1509 | /* |
1510 | * Opening of "enable" adds a ref count to system, | |
1511 | * so the name is safe to use. | |
1512 | */ | |
1513 | if (system) | |
1514 | name = system->name; | |
1515 | ||
ae63b31e | 1516 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
8ae79a13 | 1517 | if (ret) |
8f31bfe5 | 1518 | goto out; |
8ae79a13 SR |
1519 | |
1520 | ret = cnt; | |
1521 | ||
8f31bfe5 | 1522 | out: |
8ae79a13 SR |
1523 | *ppos += cnt; |
1524 | ||
1525 | return ret; | |
1526 | } | |
1527 | ||
2a37a3df SR |
1528 | enum { |
1529 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
1530 | FORMAT_FIELD_SEPERATOR = 2, |
1531 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
1532 | }; |
1533 | ||
1534 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 1535 | { |
2425bcb9 | 1536 | struct trace_event_call *call = event_file_data(m->private); |
86397dc3 LZ |
1537 | struct list_head *common_head = &ftrace_common_fields; |
1538 | struct list_head *head = trace_get_fields(call); | |
7710b639 | 1539 | struct list_head *node = v; |
981d081e | 1540 | |
2a37a3df | 1541 | (*pos)++; |
5a65e956 | 1542 | |
2a37a3df SR |
1543 | switch ((unsigned long)v) { |
1544 | case FORMAT_HEADER: | |
7710b639 ON |
1545 | node = common_head; |
1546 | break; | |
5a65e956 | 1547 | |
86397dc3 | 1548 | case FORMAT_FIELD_SEPERATOR: |
7710b639 ON |
1549 | node = head; |
1550 | break; | |
5a65e956 | 1551 | |
2a37a3df SR |
1552 | case FORMAT_PRINTFMT: |
1553 | /* all done */ | |
1554 | return NULL; | |
5a65e956 LJ |
1555 | } |
1556 | ||
7710b639 ON |
1557 | node = node->prev; |
1558 | if (node == common_head) | |
86397dc3 | 1559 | return (void *)FORMAT_FIELD_SEPERATOR; |
7710b639 | 1560 | else if (node == head) |
2a37a3df | 1561 | return (void *)FORMAT_PRINTFMT; |
7710b639 ON |
1562 | else |
1563 | return node; | |
2a37a3df SR |
1564 | } |
1565 | ||
1566 | static int f_show(struct seq_file *m, void *v) | |
1567 | { | |
2425bcb9 | 1568 | struct trace_event_call *call = event_file_data(m->private); |
2a37a3df SR |
1569 | struct ftrace_event_field *field; |
1570 | const char *array_descriptor; | |
1571 | ||
1572 | switch ((unsigned long)v) { | |
1573 | case FORMAT_HEADER: | |
687fcc4a | 1574 | seq_printf(m, "name: %s\n", trace_event_name(call)); |
2a37a3df | 1575 | seq_printf(m, "ID: %d\n", call->event.type); |
fa6f0cc7 | 1576 | seq_puts(m, "format:\n"); |
8728fe50 | 1577 | return 0; |
5a65e956 | 1578 | |
86397dc3 LZ |
1579 | case FORMAT_FIELD_SEPERATOR: |
1580 | seq_putc(m, '\n'); | |
1581 | return 0; | |
1582 | ||
2a37a3df SR |
1583 | case FORMAT_PRINTFMT: |
1584 | seq_printf(m, "\nprint fmt: %s\n", | |
1585 | call->print_fmt); | |
1586 | return 0; | |
981d081e | 1587 | } |
8728fe50 | 1588 | |
7710b639 | 1589 | field = list_entry(v, struct ftrace_event_field, link); |
2a37a3df SR |
1590 | /* |
1591 | * Smartly shows the array type(except dynamic array). | |
1592 | * Normal: | |
1593 | * field:TYPE VAR | |
1594 | * If TYPE := TYPE[LEN], it is shown: | |
1595 | * field:TYPE VAR[LEN] | |
1596 | */ | |
1597 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 1598 | |
b6b27355 | 1599 | if (str_has_prefix(field->type, "__data_loc")) |
2a37a3df | 1600 | array_descriptor = NULL; |
8728fe50 | 1601 | |
2a37a3df SR |
1602 | if (!array_descriptor) |
1603 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
1604 | field->type, field->name, field->offset, | |
1605 | field->size, !!field->is_signed); | |
b6c7abd1 YS |
1606 | else if (field->len) |
1607 | seq_printf(m, "\tfield:%.*s %s[%d];\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
2a37a3df SR |
1608 | (int)(array_descriptor - field->type), |
1609 | field->type, field->name, | |
b6c7abd1 | 1610 | field->len, field->offset, |
2a37a3df | 1611 | field->size, !!field->is_signed); |
b6c7abd1 YS |
1612 | else |
1613 | seq_printf(m, "\tfield:%.*s %s[];\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
1614 | (int)(array_descriptor - field->type), | |
1615 | field->type, field->name, | |
1616 | field->offset, field->size, !!field->is_signed); | |
8728fe50 | 1617 | |
2a37a3df SR |
1618 | return 0; |
1619 | } | |
5a65e956 | 1620 | |
7710b639 ON |
1621 | static void *f_start(struct seq_file *m, loff_t *pos) |
1622 | { | |
1623 | void *p = (void *)FORMAT_HEADER; | |
1624 | loff_t l = 0; | |
1625 | ||
c5a44a12 ON |
1626 | /* ->stop() is called even if ->start() fails */ |
1627 | mutex_lock(&event_mutex); | |
1628 | if (!event_file_data(m->private)) | |
1629 | return ERR_PTR(-ENODEV); | |
1630 | ||
7710b639 ON |
1631 | while (l < *pos && p) |
1632 | p = f_next(m, p, &l); | |
1633 | ||
1634 | return p; | |
1635 | } | |
1636 | ||
2a37a3df SR |
1637 | static void f_stop(struct seq_file *m, void *p) |
1638 | { | |
c5a44a12 | 1639 | mutex_unlock(&event_mutex); |
2a37a3df | 1640 | } |
981d081e | 1641 | |
2a37a3df SR |
1642 | static const struct seq_operations trace_format_seq_ops = { |
1643 | .start = f_start, | |
1644 | .next = f_next, | |
1645 | .stop = f_stop, | |
1646 | .show = f_show, | |
1647 | }; | |
1648 | ||
1649 | static int trace_format_open(struct inode *inode, struct file *file) | |
1650 | { | |
2a37a3df SR |
1651 | struct seq_file *m; |
1652 | int ret; | |
1653 | ||
17911ff3 SRV |
1654 | /* Do we want to hide event format files on tracefs lockdown? */ |
1655 | ||
2a37a3df SR |
1656 | ret = seq_open(file, &trace_format_seq_ops); |
1657 | if (ret < 0) | |
1658 | return ret; | |
1659 | ||
1660 | m = file->private_data; | |
c5a44a12 | 1661 | m->private = file; |
2a37a3df SR |
1662 | |
1663 | return 0; | |
981d081e SR |
1664 | } |
1665 | ||
23725aee PZ |
1666 | static ssize_t |
1667 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1668 | { | |
1a11126b | 1669 | int id = (long)event_file_data(filp); |
cd458ba9 ON |
1670 | char buf[32]; |
1671 | int len; | |
23725aee | 1672 | |
1a11126b ON |
1673 | if (unlikely(!id)) |
1674 | return -ENODEV; | |
1675 | ||
1676 | len = sprintf(buf, "%d\n", id); | |
1677 | ||
cd458ba9 | 1678 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); |
23725aee PZ |
1679 | } |
1680 | ||
7ce7e424 TZ |
1681 | static ssize_t |
1682 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1683 | loff_t *ppos) | |
1684 | { | |
7f1d2f82 | 1685 | struct trace_event_file *file; |
7ce7e424 | 1686 | struct trace_seq *s; |
e2912b09 | 1687 | int r = -ENODEV; |
7ce7e424 TZ |
1688 | |
1689 | if (*ppos) | |
1690 | return 0; | |
1691 | ||
1692 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
e2912b09 | 1693 | |
7ce7e424 TZ |
1694 | if (!s) |
1695 | return -ENOMEM; | |
1696 | ||
1697 | trace_seq_init(s); | |
1698 | ||
e2912b09 | 1699 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1700 | file = event_file_data(filp); |
1701 | if (file) | |
1702 | print_event_filter(file, s); | |
e2912b09 ON |
1703 | mutex_unlock(&event_mutex); |
1704 | ||
f306cc82 | 1705 | if (file) |
5ac48378 SRRH |
1706 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1707 | s->buffer, trace_seq_used(s)); | |
7ce7e424 TZ |
1708 | |
1709 | kfree(s); | |
1710 | ||
1711 | return r; | |
1712 | } | |
1713 | ||
1714 | static ssize_t | |
1715 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1716 | loff_t *ppos) | |
1717 | { | |
7f1d2f82 | 1718 | struct trace_event_file *file; |
8b372562 | 1719 | char *buf; |
e2912b09 | 1720 | int err = -ENODEV; |
7ce7e424 | 1721 | |
8b372562 | 1722 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
1723 | return -EINVAL; |
1724 | ||
70f6cbb6 AV |
1725 | buf = memdup_user_nul(ubuf, cnt); |
1726 | if (IS_ERR(buf)) | |
1727 | return PTR_ERR(buf); | |
7ce7e424 | 1728 | |
e2912b09 | 1729 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1730 | file = event_file_data(filp); |
1731 | if (file) | |
1732 | err = apply_event_filter(file, buf); | |
e2912b09 ON |
1733 | mutex_unlock(&event_mutex); |
1734 | ||
70f6cbb6 | 1735 | kfree(buf); |
8b372562 | 1736 | if (err < 0) |
44e9c8b7 | 1737 | return err; |
0a19e53c | 1738 | |
7ce7e424 TZ |
1739 | *ppos += cnt; |
1740 | ||
1741 | return cnt; | |
1742 | } | |
1743 | ||
e9dbfae5 SR |
1744 | static LIST_HEAD(event_subsystems); |
1745 | ||
1746 | static int subsystem_open(struct inode *inode, struct file *filp) | |
1747 | { | |
99d8ae4e JK |
1748 | struct trace_subsystem_dir *dir = NULL, *iter_dir; |
1749 | struct trace_array *tr = NULL, *iter_tr; | |
e9dbfae5 SR |
1750 | struct event_subsystem *system = NULL; |
1751 | int ret; | |
1752 | ||
d6d3523c GB |
1753 | if (tracing_is_disabled()) |
1754 | return -ENODEV; | |
1755 | ||
e9dbfae5 SR |
1756 | /* Make sure the system still exists */ |
1757 | mutex_lock(&event_mutex); | |
12ecef0c | 1758 | mutex_lock(&trace_types_lock); |
99d8ae4e JK |
1759 | list_for_each_entry(iter_tr, &ftrace_trace_arrays, list) { |
1760 | list_for_each_entry(iter_dir, &iter_tr->systems, list) { | |
1761 | if (iter_dir == inode->i_private) { | |
ae63b31e | 1762 | /* Don't open systems with no events */ |
99d8ae4e JK |
1763 | tr = iter_tr; |
1764 | dir = iter_dir; | |
ae63b31e SR |
1765 | if (dir->nr_events) { |
1766 | __get_system_dir(dir); | |
1767 | system = dir->subsystem; | |
1768 | } | |
1769 | goto exit_loop; | |
e9dbfae5 | 1770 | } |
e9dbfae5 SR |
1771 | } |
1772 | } | |
ae63b31e | 1773 | exit_loop: |
a8227415 | 1774 | mutex_unlock(&trace_types_lock); |
12ecef0c | 1775 | mutex_unlock(&event_mutex); |
e9dbfae5 | 1776 | |
ae63b31e | 1777 | if (!system) |
e9dbfae5 SR |
1778 | return -ENODEV; |
1779 | ||
8e2e2fa4 SRRH |
1780 | /* Still need to increment the ref count of the system */ |
1781 | if (trace_array_get(tr) < 0) { | |
1782 | put_system(dir); | |
1783 | return -ENODEV; | |
1784 | } | |
1785 | ||
e9dbfae5 | 1786 | ret = tracing_open_generic(inode, filp); |
8e2e2fa4 SRRH |
1787 | if (ret < 0) { |
1788 | trace_array_put(tr); | |
ae63b31e | 1789 | put_system(dir); |
8e2e2fa4 | 1790 | } |
ae63b31e SR |
1791 | |
1792 | return ret; | |
1793 | } | |
1794 | ||
1795 | static int system_tr_open(struct inode *inode, struct file *filp) | |
1796 | { | |
7967b3e0 | 1797 | struct trace_subsystem_dir *dir; |
ae63b31e SR |
1798 | struct trace_array *tr = inode->i_private; |
1799 | int ret; | |
1800 | ||
1801 | /* Make a temporary dir that has no system but points to tr */ | |
1802 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); | |
aa07d71f | 1803 | if (!dir) |
ae63b31e | 1804 | return -ENOMEM; |
ae63b31e | 1805 | |
aa07d71f | 1806 | ret = tracing_open_generic_tr(inode, filp); |
8e2e2fa4 | 1807 | if (ret < 0) { |
ae63b31e | 1808 | kfree(dir); |
d6d3523c | 1809 | return ret; |
8e2e2fa4 | 1810 | } |
aa07d71f | 1811 | dir->tr = tr; |
ae63b31e | 1812 | filp->private_data = dir; |
e9dbfae5 | 1813 | |
d6d3523c | 1814 | return 0; |
e9dbfae5 SR |
1815 | } |
1816 | ||
1817 | static int subsystem_release(struct inode *inode, struct file *file) | |
1818 | { | |
7967b3e0 | 1819 | struct trace_subsystem_dir *dir = file->private_data; |
e9dbfae5 | 1820 | |
8e2e2fa4 SRRH |
1821 | trace_array_put(dir->tr); |
1822 | ||
ae63b31e SR |
1823 | /* |
1824 | * If dir->subsystem is NULL, then this is a temporary | |
1825 | * descriptor that was made for a trace_array to enable | |
1826 | * all subsystems. | |
1827 | */ | |
1828 | if (dir->subsystem) | |
1829 | put_system(dir); | |
1830 | else | |
1831 | kfree(dir); | |
e9dbfae5 SR |
1832 | |
1833 | return 0; | |
1834 | } | |
1835 | ||
cfb180f3 TZ |
1836 | static ssize_t |
1837 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1838 | loff_t *ppos) | |
1839 | { | |
7967b3e0 | 1840 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1841 | struct event_subsystem *system = dir->subsystem; |
cfb180f3 TZ |
1842 | struct trace_seq *s; |
1843 | int r; | |
1844 | ||
1845 | if (*ppos) | |
1846 | return 0; | |
1847 | ||
1848 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1849 | if (!s) | |
1850 | return -ENOMEM; | |
1851 | ||
1852 | trace_seq_init(s); | |
1853 | ||
8b372562 | 1854 | print_subsystem_event_filter(system, s); |
5ac48378 SRRH |
1855 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1856 | s->buffer, trace_seq_used(s)); | |
cfb180f3 TZ |
1857 | |
1858 | kfree(s); | |
1859 | ||
1860 | return r; | |
1861 | } | |
1862 | ||
1863 | static ssize_t | |
1864 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1865 | loff_t *ppos) | |
1866 | { | |
7967b3e0 | 1867 | struct trace_subsystem_dir *dir = filp->private_data; |
8b372562 | 1868 | char *buf; |
cfb180f3 TZ |
1869 | int err; |
1870 | ||
8b372562 | 1871 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
1872 | return -EINVAL; |
1873 | ||
70f6cbb6 AV |
1874 | buf = memdup_user_nul(ubuf, cnt); |
1875 | if (IS_ERR(buf)) | |
1876 | return PTR_ERR(buf); | |
cfb180f3 | 1877 | |
ae63b31e | 1878 | err = apply_subsystem_event_filter(dir, buf); |
70f6cbb6 | 1879 | kfree(buf); |
8b372562 | 1880 | if (err < 0) |
44e9c8b7 | 1881 | return err; |
cfb180f3 TZ |
1882 | |
1883 | *ppos += cnt; | |
1884 | ||
1885 | return cnt; | |
1886 | } | |
1887 | ||
d1b182a8 SR |
1888 | static ssize_t |
1889 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1890 | { | |
1891 | int (*func)(struct trace_seq *s) = filp->private_data; | |
1892 | struct trace_seq *s; | |
1893 | int r; | |
1894 | ||
1895 | if (*ppos) | |
1896 | return 0; | |
1897 | ||
1898 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1899 | if (!s) | |
1900 | return -ENOMEM; | |
1901 | ||
1902 | trace_seq_init(s); | |
1903 | ||
1904 | func(s); | |
5ac48378 SRRH |
1905 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1906 | s->buffer, trace_seq_used(s)); | |
d1b182a8 SR |
1907 | |
1908 | kfree(s); | |
1909 | ||
1910 | return r; | |
1911 | } | |
1912 | ||
8ca532ad SRRH |
1913 | static void ignore_task_cpu(void *data) |
1914 | { | |
1915 | struct trace_array *tr = data; | |
1916 | struct trace_pid_list *pid_list; | |
27683626 | 1917 | struct trace_pid_list *no_pid_list; |
8ca532ad SRRH |
1918 | |
1919 | /* | |
1920 | * This function is called by on_each_cpu() while the | |
1921 | * event_mutex is held. | |
1922 | */ | |
1923 | pid_list = rcu_dereference_protected(tr->filtered_pids, | |
1924 | mutex_is_locked(&event_mutex)); | |
27683626 SRV |
1925 | no_pid_list = rcu_dereference_protected(tr->filtered_no_pids, |
1926 | mutex_is_locked(&event_mutex)); | |
8ca532ad | 1927 | |
1c5eb448 | 1928 | this_cpu_write(tr->array_buffer.data->ignore_pid, |
27683626 SRV |
1929 | trace_ignore_this_task(pid_list, no_pid_list, current)); |
1930 | } | |
1931 | ||
1932 | static void register_pid_events(struct trace_array *tr) | |
1933 | { | |
1934 | /* | |
1935 | * Register a probe that is called before all other probes | |
1936 | * to set ignore_pid if next or prev do not match. | |
1937 | * Register a probe this is called after all other probes | |
1938 | * to only keep ignore_pid set if next pid matches. | |
1939 | */ | |
1940 | register_trace_prio_sched_switch(event_filter_pid_sched_switch_probe_pre, | |
1941 | tr, INT_MAX); | |
1942 | register_trace_prio_sched_switch(event_filter_pid_sched_switch_probe_post, | |
1943 | tr, 0); | |
1944 | ||
1945 | register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_pre, | |
1946 | tr, INT_MAX); | |
1947 | register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_post, | |
1948 | tr, 0); | |
1949 | ||
1950 | register_trace_prio_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_pre, | |
1951 | tr, INT_MAX); | |
1952 | register_trace_prio_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_post, | |
1953 | tr, 0); | |
1954 | ||
1955 | register_trace_prio_sched_waking(event_filter_pid_sched_wakeup_probe_pre, | |
1956 | tr, INT_MAX); | |
1957 | register_trace_prio_sched_waking(event_filter_pid_sched_wakeup_probe_post, | |
1958 | tr, 0); | |
8ca532ad SRRH |
1959 | } |
1960 | ||
49090107 | 1961 | static ssize_t |
27683626 SRV |
1962 | event_pid_write(struct file *filp, const char __user *ubuf, |
1963 | size_t cnt, loff_t *ppos, int type) | |
49090107 | 1964 | { |
3fdaf80f | 1965 | struct seq_file *m = filp->private_data; |
49090107 SRRH |
1966 | struct trace_array *tr = m->private; |
1967 | struct trace_pid_list *filtered_pids = NULL; | |
27683626 | 1968 | struct trace_pid_list *other_pids = NULL; |
f4d34a87 | 1969 | struct trace_pid_list *pid_list; |
3fdaf80f | 1970 | struct trace_event_file *file; |
76c813e2 | 1971 | ssize_t ret; |
49090107 SRRH |
1972 | |
1973 | if (!cnt) | |
1974 | return 0; | |
1975 | ||
1976 | ret = tracing_update_buffers(); | |
1977 | if (ret < 0) | |
1978 | return ret; | |
1979 | ||
49090107 | 1980 | mutex_lock(&event_mutex); |
76c813e2 | 1981 | |
27683626 SRV |
1982 | if (type == TRACE_PIDS) { |
1983 | filtered_pids = rcu_dereference_protected(tr->filtered_pids, | |
1984 | lockdep_is_held(&event_mutex)); | |
1985 | other_pids = rcu_dereference_protected(tr->filtered_no_pids, | |
1986 | lockdep_is_held(&event_mutex)); | |
1987 | } else { | |
1988 | filtered_pids = rcu_dereference_protected(tr->filtered_no_pids, | |
1989 | lockdep_is_held(&event_mutex)); | |
1990 | other_pids = rcu_dereference_protected(tr->filtered_pids, | |
1991 | lockdep_is_held(&event_mutex)); | |
1992 | } | |
f4d34a87 | 1993 | |
76c813e2 SRRH |
1994 | ret = trace_pid_write(filtered_pids, &pid_list, ubuf, cnt); |
1995 | if (ret < 0) | |
f4d34a87 | 1996 | goto out; |
49090107 | 1997 | |
27683626 SRV |
1998 | if (type == TRACE_PIDS) |
1999 | rcu_assign_pointer(tr->filtered_pids, pid_list); | |
2000 | else | |
2001 | rcu_assign_pointer(tr->filtered_no_pids, pid_list); | |
49090107 | 2002 | |
3fdaf80f SRRH |
2003 | list_for_each_entry(file, &tr->events, list) { |
2004 | set_bit(EVENT_FILE_FL_PID_FILTER_BIT, &file->flags); | |
2005 | } | |
49090107 SRRH |
2006 | |
2007 | if (filtered_pids) { | |
e0a568dc | 2008 | tracepoint_synchronize_unregister(); |
6954e415 | 2009 | trace_pid_list_free(filtered_pids); |
27683626 SRV |
2010 | } else if (pid_list && !other_pids) { |
2011 | register_pid_events(tr); | |
49090107 SRRH |
2012 | } |
2013 | ||
799fd44c SRRH |
2014 | /* |
2015 | * Ignoring of pids is done at task switch. But we have to | |
2016 | * check for those tasks that are currently running. | |
2017 | * Always do this in case a pid was appended or removed. | |
2018 | */ | |
2019 | on_each_cpu(ignore_task_cpu, tr, 1); | |
2020 | ||
f4d34a87 | 2021 | out: |
3fdaf80f SRRH |
2022 | mutex_unlock(&event_mutex); |
2023 | ||
76c813e2 SRRH |
2024 | if (ret > 0) |
2025 | *ppos += ret; | |
49090107 SRRH |
2026 | |
2027 | return ret; | |
2028 | } | |
2029 | ||
27683626 SRV |
2030 | static ssize_t |
2031 | ftrace_event_pid_write(struct file *filp, const char __user *ubuf, | |
2032 | size_t cnt, loff_t *ppos) | |
2033 | { | |
2034 | return event_pid_write(filp, ubuf, cnt, ppos, TRACE_PIDS); | |
2035 | } | |
2036 | ||
2037 | static ssize_t | |
2038 | ftrace_event_npid_write(struct file *filp, const char __user *ubuf, | |
2039 | size_t cnt, loff_t *ppos) | |
2040 | { | |
2041 | return event_pid_write(filp, ubuf, cnt, ppos, TRACE_NO_PIDS); | |
2042 | } | |
2043 | ||
15075cac SR |
2044 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
2045 | static int ftrace_event_set_open(struct inode *inode, struct file *file); | |
49090107 | 2046 | static int ftrace_event_set_pid_open(struct inode *inode, struct file *file); |
27683626 | 2047 | static int ftrace_event_set_npid_open(struct inode *inode, struct file *file); |
f77d09a3 | 2048 | static int ftrace_event_release(struct inode *inode, struct file *file); |
15075cac | 2049 | |
b77e38aa SR |
2050 | static const struct seq_operations show_event_seq_ops = { |
2051 | .start = t_start, | |
2052 | .next = t_next, | |
2053 | .show = t_show, | |
2054 | .stop = t_stop, | |
2055 | }; | |
2056 | ||
2057 | static const struct seq_operations show_set_event_seq_ops = { | |
2058 | .start = s_start, | |
2059 | .next = s_next, | |
2060 | .show = t_show, | |
2061 | .stop = t_stop, | |
2062 | }; | |
2063 | ||
49090107 SRRH |
2064 | static const struct seq_operations show_set_pid_seq_ops = { |
2065 | .start = p_start, | |
2066 | .next = p_next, | |
5cc8976b | 2067 | .show = trace_pid_show, |
49090107 SRRH |
2068 | .stop = p_stop, |
2069 | }; | |
2070 | ||
27683626 SRV |
2071 | static const struct seq_operations show_set_no_pid_seq_ops = { |
2072 | .start = np_start, | |
2073 | .next = np_next, | |
2074 | .show = trace_pid_show, | |
2075 | .stop = p_stop, | |
2076 | }; | |
2077 | ||
2314c4ae | 2078 | static const struct file_operations ftrace_avail_fops = { |
15075cac | 2079 | .open = ftrace_event_avail_open, |
2314c4ae SR |
2080 | .read = seq_read, |
2081 | .llseek = seq_lseek, | |
2082 | .release = seq_release, | |
2083 | }; | |
2084 | ||
b77e38aa | 2085 | static const struct file_operations ftrace_set_event_fops = { |
15075cac | 2086 | .open = ftrace_event_set_open, |
b77e38aa SR |
2087 | .read = seq_read, |
2088 | .write = ftrace_event_write, | |
2089 | .llseek = seq_lseek, | |
f77d09a3 | 2090 | .release = ftrace_event_release, |
b77e38aa SR |
2091 | }; |
2092 | ||
49090107 SRRH |
2093 | static const struct file_operations ftrace_set_event_pid_fops = { |
2094 | .open = ftrace_event_set_pid_open, | |
2095 | .read = seq_read, | |
2096 | .write = ftrace_event_pid_write, | |
2097 | .llseek = seq_lseek, | |
2098 | .release = ftrace_event_release, | |
2099 | }; | |
2100 | ||
27683626 SRV |
2101 | static const struct file_operations ftrace_set_event_notrace_pid_fops = { |
2102 | .open = ftrace_event_set_npid_open, | |
2103 | .read = seq_read, | |
2104 | .write = ftrace_event_npid_write, | |
2105 | .llseek = seq_lseek, | |
2106 | .release = ftrace_event_release, | |
2107 | }; | |
2108 | ||
1473e441 | 2109 | static const struct file_operations ftrace_enable_fops = { |
bf682c31 | 2110 | .open = tracing_open_generic, |
1473e441 SR |
2111 | .read = event_enable_read, |
2112 | .write = event_enable_write, | |
6038f373 | 2113 | .llseek = default_llseek, |
1473e441 SR |
2114 | }; |
2115 | ||
981d081e | 2116 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
2117 | .open = trace_format_open, |
2118 | .read = seq_read, | |
2119 | .llseek = seq_lseek, | |
2120 | .release = seq_release, | |
981d081e SR |
2121 | }; |
2122 | ||
23725aee | 2123 | static const struct file_operations ftrace_event_id_fops = { |
23725aee | 2124 | .read = event_id_read, |
6038f373 | 2125 | .llseek = default_llseek, |
23725aee PZ |
2126 | }; |
2127 | ||
7ce7e424 TZ |
2128 | static const struct file_operations ftrace_event_filter_fops = { |
2129 | .open = tracing_open_generic, | |
2130 | .read = event_filter_read, | |
2131 | .write = event_filter_write, | |
6038f373 | 2132 | .llseek = default_llseek, |
7ce7e424 TZ |
2133 | }; |
2134 | ||
cfb180f3 | 2135 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 2136 | .open = subsystem_open, |
cfb180f3 TZ |
2137 | .read = subsystem_filter_read, |
2138 | .write = subsystem_filter_write, | |
6038f373 | 2139 | .llseek = default_llseek, |
e9dbfae5 | 2140 | .release = subsystem_release, |
cfb180f3 TZ |
2141 | }; |
2142 | ||
8ae79a13 | 2143 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 2144 | .open = subsystem_open, |
8ae79a13 SR |
2145 | .read = system_enable_read, |
2146 | .write = system_enable_write, | |
6038f373 | 2147 | .llseek = default_llseek, |
40ee4dff | 2148 | .release = subsystem_release, |
8ae79a13 SR |
2149 | }; |
2150 | ||
ae63b31e SR |
2151 | static const struct file_operations ftrace_tr_enable_fops = { |
2152 | .open = system_tr_open, | |
2153 | .read = system_enable_read, | |
2154 | .write = system_enable_write, | |
2155 | .llseek = default_llseek, | |
2156 | .release = subsystem_release, | |
2157 | }; | |
2158 | ||
d1b182a8 SR |
2159 | static const struct file_operations ftrace_show_header_fops = { |
2160 | .open = tracing_open_generic, | |
2161 | .read = show_header, | |
6038f373 | 2162 | .llseek = default_llseek, |
d1b182a8 SR |
2163 | }; |
2164 | ||
ae63b31e SR |
2165 | static int |
2166 | ftrace_event_open(struct inode *inode, struct file *file, | |
2167 | const struct seq_operations *seq_ops) | |
1473e441 | 2168 | { |
ae63b31e SR |
2169 | struct seq_file *m; |
2170 | int ret; | |
1473e441 | 2171 | |
17911ff3 SRV |
2172 | ret = security_locked_down(LOCKDOWN_TRACEFS); |
2173 | if (ret) | |
2174 | return ret; | |
2175 | ||
ae63b31e SR |
2176 | ret = seq_open(file, seq_ops); |
2177 | if (ret < 0) | |
2178 | return ret; | |
2179 | m = file->private_data; | |
2180 | /* copy tr over to seq ops */ | |
2181 | m->private = inode->i_private; | |
1473e441 | 2182 | |
ae63b31e | 2183 | return ret; |
1473e441 SR |
2184 | } |
2185 | ||
f77d09a3 AL |
2186 | static int ftrace_event_release(struct inode *inode, struct file *file) |
2187 | { | |
2188 | struct trace_array *tr = inode->i_private; | |
2189 | ||
2190 | trace_array_put(tr); | |
2191 | ||
2192 | return seq_release(inode, file); | |
2193 | } | |
2194 | ||
15075cac SR |
2195 | static int |
2196 | ftrace_event_avail_open(struct inode *inode, struct file *file) | |
2197 | { | |
2198 | const struct seq_operations *seq_ops = &show_event_seq_ops; | |
2199 | ||
17911ff3 | 2200 | /* Checks for tracefs lockdown */ |
ae63b31e | 2201 | return ftrace_event_open(inode, file, seq_ops); |
15075cac SR |
2202 | } |
2203 | ||
2204 | static int | |
2205 | ftrace_event_set_open(struct inode *inode, struct file *file) | |
2206 | { | |
2207 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; | |
ae63b31e | 2208 | struct trace_array *tr = inode->i_private; |
f77d09a3 AL |
2209 | int ret; |
2210 | ||
8530dec6 SRV |
2211 | ret = tracing_check_open_get_tr(tr); |
2212 | if (ret) | |
2213 | return ret; | |
15075cac SR |
2214 | |
2215 | if ((file->f_mode & FMODE_WRITE) && | |
2216 | (file->f_flags & O_TRUNC)) | |
ae63b31e | 2217 | ftrace_clear_events(tr); |
15075cac | 2218 | |
f77d09a3 AL |
2219 | ret = ftrace_event_open(inode, file, seq_ops); |
2220 | if (ret < 0) | |
2221 | trace_array_put(tr); | |
2222 | return ret; | |
ae63b31e SR |
2223 | } |
2224 | ||
49090107 SRRH |
2225 | static int |
2226 | ftrace_event_set_pid_open(struct inode *inode, struct file *file) | |
2227 | { | |
2228 | const struct seq_operations *seq_ops = &show_set_pid_seq_ops; | |
2229 | struct trace_array *tr = inode->i_private; | |
2230 | int ret; | |
2231 | ||
8530dec6 SRV |
2232 | ret = tracing_check_open_get_tr(tr); |
2233 | if (ret) | |
2234 | return ret; | |
49090107 SRRH |
2235 | |
2236 | if ((file->f_mode & FMODE_WRITE) && | |
2237 | (file->f_flags & O_TRUNC)) | |
27683626 SRV |
2238 | ftrace_clear_event_pids(tr, TRACE_PIDS); |
2239 | ||
2240 | ret = ftrace_event_open(inode, file, seq_ops); | |
2241 | if (ret < 0) | |
2242 | trace_array_put(tr); | |
2243 | return ret; | |
2244 | } | |
2245 | ||
2246 | static int | |
2247 | ftrace_event_set_npid_open(struct inode *inode, struct file *file) | |
2248 | { | |
2249 | const struct seq_operations *seq_ops = &show_set_no_pid_seq_ops; | |
2250 | struct trace_array *tr = inode->i_private; | |
2251 | int ret; | |
2252 | ||
2253 | ret = tracing_check_open_get_tr(tr); | |
2254 | if (ret) | |
2255 | return ret; | |
2256 | ||
2257 | if ((file->f_mode & FMODE_WRITE) && | |
2258 | (file->f_flags & O_TRUNC)) | |
2259 | ftrace_clear_event_pids(tr, TRACE_NO_PIDS); | |
49090107 SRRH |
2260 | |
2261 | ret = ftrace_event_open(inode, file, seq_ops); | |
2262 | if (ret < 0) | |
2263 | trace_array_put(tr); | |
2264 | return ret; | |
2265 | } | |
2266 | ||
ae63b31e SR |
2267 | static struct event_subsystem * |
2268 | create_new_subsystem(const char *name) | |
2269 | { | |
2270 | struct event_subsystem *system; | |
2271 | ||
2272 | /* need to create new entry */ | |
2273 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
2274 | if (!system) | |
2275 | return NULL; | |
2276 | ||
2277 | system->ref_count = 1; | |
6e94a780 SR |
2278 | |
2279 | /* Only allocate if dynamic (kprobes and modules) */ | |
79ac6ef5 RV |
2280 | system->name = kstrdup_const(name, GFP_KERNEL); |
2281 | if (!system->name) | |
2282 | goto out_free; | |
ae63b31e | 2283 | |
ae63b31e SR |
2284 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
2285 | if (!system->filter) | |
2286 | goto out_free; | |
2287 | ||
2288 | list_add(&system->list, &event_subsystems); | |
2289 | ||
2290 | return system; | |
2291 | ||
2292 | out_free: | |
79ac6ef5 | 2293 | kfree_const(system->name); |
ae63b31e SR |
2294 | kfree(system); |
2295 | return NULL; | |
15075cac SR |
2296 | } |
2297 | ||
6ecc2d1c | 2298 | static struct dentry * |
ae63b31e | 2299 | event_subsystem_dir(struct trace_array *tr, const char *name, |
7f1d2f82 | 2300 | struct trace_event_file *file, struct dentry *parent) |
6ecc2d1c | 2301 | { |
ba27d855 | 2302 | struct event_subsystem *system, *iter; |
7967b3e0 | 2303 | struct trace_subsystem_dir *dir; |
e1112b4d | 2304 | struct dentry *entry; |
6ecc2d1c SR |
2305 | |
2306 | /* First see if we did not already create this dir */ | |
ae63b31e SR |
2307 | list_for_each_entry(dir, &tr->systems, list) { |
2308 | system = dir->subsystem; | |
dc82ec98 | 2309 | if (strcmp(system->name, name) == 0) { |
ae63b31e SR |
2310 | dir->nr_events++; |
2311 | file->system = dir; | |
2312 | return dir->entry; | |
dc82ec98 | 2313 | } |
6ecc2d1c SR |
2314 | } |
2315 | ||
ae63b31e | 2316 | /* Now see if the system itself exists. */ |
ba27d855 JK |
2317 | system = NULL; |
2318 | list_for_each_entry(iter, &event_subsystems, list) { | |
2319 | if (strcmp(iter->name, name) == 0) { | |
2320 | system = iter; | |
ae63b31e | 2321 | break; |
ba27d855 | 2322 | } |
6ecc2d1c SR |
2323 | } |
2324 | ||
ae63b31e SR |
2325 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
2326 | if (!dir) | |
2327 | goto out_fail; | |
6ecc2d1c | 2328 | |
ae63b31e SR |
2329 | if (!system) { |
2330 | system = create_new_subsystem(name); | |
2331 | if (!system) | |
2332 | goto out_free; | |
2333 | } else | |
2334 | __get_system(system); | |
2335 | ||
8434dc93 | 2336 | dir->entry = tracefs_create_dir(name, parent); |
ae63b31e | 2337 | if (!dir->entry) { |
3448bac3 | 2338 | pr_warn("Failed to create system directory %s\n", name); |
ae63b31e SR |
2339 | __put_system(system); |
2340 | goto out_free; | |
6d723736 SR |
2341 | } |
2342 | ||
ae63b31e SR |
2343 | dir->tr = tr; |
2344 | dir->ref_count = 1; | |
2345 | dir->nr_events = 1; | |
2346 | dir->subsystem = system; | |
2347 | file->system = dir; | |
8b372562 | 2348 | |
2d396cb3 SRV |
2349 | /* the ftrace system is special, do not create enable or filter files */ |
2350 | if (strcmp(name, "ftrace") != 0) { | |
e1112b4d | 2351 | |
21ccc9cd SRV |
2352 | entry = tracefs_create_file("filter", TRACE_MODE_WRITE, |
2353 | dir->entry, dir, | |
2d396cb3 SRV |
2354 | &ftrace_subsystem_filter_fops); |
2355 | if (!entry) { | |
2356 | kfree(system->filter); | |
2357 | system->filter = NULL; | |
2358 | pr_warn("Could not create tracefs '%s/filter' entry\n", name); | |
2359 | } | |
e1112b4d | 2360 | |
21ccc9cd | 2361 | trace_create_file("enable", TRACE_MODE_WRITE, dir->entry, dir, |
2d396cb3 SRV |
2362 | &ftrace_system_enable_fops); |
2363 | } | |
8ae79a13 | 2364 | |
ae63b31e SR |
2365 | list_add(&dir->list, &tr->systems); |
2366 | ||
2367 | return dir->entry; | |
2368 | ||
2369 | out_free: | |
2370 | kfree(dir); | |
2371 | out_fail: | |
2372 | /* Only print this message if failed on memory allocation */ | |
2373 | if (!dir || !system) | |
3448bac3 | 2374 | pr_warn("No memory to create event subsystem %s\n", name); |
ae63b31e | 2375 | return NULL; |
6ecc2d1c SR |
2376 | } |
2377 | ||
ac343da7 MH |
2378 | static int |
2379 | event_define_fields(struct trace_event_call *call) | |
2380 | { | |
2381 | struct list_head *head; | |
2382 | int ret = 0; | |
2383 | ||
2384 | /* | |
2385 | * Other events may have the same class. Only update | |
2386 | * the fields if they are not already defined. | |
2387 | */ | |
2388 | head = trace_get_fields(call); | |
2389 | if (list_empty(head)) { | |
2390 | struct trace_event_fields *field = call->class->fields_array; | |
2391 | unsigned int offset = sizeof(struct trace_entry); | |
2392 | ||
2393 | for (; field->type; field++) { | |
2394 | if (field->type == TRACE_FUNCTION_TYPE) { | |
2395 | field->define_fields(call); | |
2396 | break; | |
2397 | } | |
2398 | ||
2399 | offset = ALIGN(offset, field->align); | |
b6c7abd1 | 2400 | ret = trace_define_field_ext(call, field->type, field->name, |
ac343da7 | 2401 | offset, field->size, |
b6c7abd1 YS |
2402 | field->is_signed, field->filter_type, |
2403 | field->len); | |
ac343da7 MH |
2404 | if (WARN_ON_ONCE(ret)) { |
2405 | pr_err("error code is %d\n", ret); | |
2406 | break; | |
2407 | } | |
2408 | ||
2409 | offset += field->size; | |
2410 | } | |
2411 | } | |
2412 | ||
2413 | return ret; | |
2414 | } | |
2415 | ||
1473e441 | 2416 | static int |
7f1d2f82 | 2417 | event_create_dir(struct dentry *parent, struct trace_event_file *file) |
1473e441 | 2418 | { |
2425bcb9 | 2419 | struct trace_event_call *call = file->event_call; |
ae63b31e | 2420 | struct trace_array *tr = file->tr; |
ae63b31e | 2421 | struct dentry *d_events; |
de7b2973 | 2422 | const char *name; |
fd994989 | 2423 | int ret; |
1473e441 | 2424 | |
6ecc2d1c SR |
2425 | /* |
2426 | * If the trace point header did not define TRACE_SYSTEM | |
2427 | * then the system would be called "TRACE_SYSTEM". | |
2428 | */ | |
ae63b31e SR |
2429 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { |
2430 | d_events = event_subsystem_dir(tr, call->class->system, file, parent); | |
2431 | if (!d_events) | |
2432 | return -ENOMEM; | |
2433 | } else | |
2434 | d_events = parent; | |
2435 | ||
687fcc4a | 2436 | name = trace_event_name(call); |
8434dc93 | 2437 | file->dir = tracefs_create_dir(name, d_events); |
ae63b31e | 2438 | if (!file->dir) { |
8434dc93 | 2439 | pr_warn("Could not create tracefs '%s' directory\n", name); |
1473e441 SR |
2440 | return -1; |
2441 | } | |
2442 | ||
9b63776f | 2443 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
21ccc9cd | 2444 | trace_create_file("enable", TRACE_MODE_WRITE, file->dir, file, |
620a30e9 | 2445 | &ftrace_enable_fops); |
1473e441 | 2446 | |
2239291a | 2447 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 2448 | if (call->event.type && call->class->reg) |
21ccc9cd | 2449 | trace_create_file("id", TRACE_MODE_READ, file->dir, |
620a30e9 ON |
2450 | (void *)(long)call->event.type, |
2451 | &ftrace_event_id_fops); | |
2239291a | 2452 | #endif |
23725aee | 2453 | |
ac343da7 MH |
2454 | ret = event_define_fields(call); |
2455 | if (ret < 0) { | |
2456 | pr_warn("Could not initialize trace point events/%s\n", name); | |
2457 | return ret; | |
cf027f64 TZ |
2458 | } |
2459 | ||
854145e0 CH |
2460 | /* |
2461 | * Only event directories that can be enabled should have | |
5d948c86 | 2462 | * triggers or filters. |
854145e0 | 2463 | */ |
5d948c86 | 2464 | if (!(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) { |
21ccc9cd SRV |
2465 | trace_create_file("filter", TRACE_MODE_WRITE, file->dir, |
2466 | file, &ftrace_event_filter_fops); | |
5d948c86 | 2467 | |
21ccc9cd SRV |
2468 | trace_create_file("trigger", TRACE_MODE_WRITE, file->dir, |
2469 | file, &event_trigger_fops); | |
5d948c86 | 2470 | } |
85f2b082 | 2471 | |
7ef224d1 | 2472 | #ifdef CONFIG_HIST_TRIGGERS |
21ccc9cd | 2473 | trace_create_file("hist", TRACE_MODE_READ, file->dir, file, |
7ef224d1 | 2474 | &event_hist_fops); |
2d19bd79 TZ |
2475 | #endif |
2476 | #ifdef CONFIG_HIST_TRIGGERS_DEBUG | |
21ccc9cd | 2477 | trace_create_file("hist_debug", TRACE_MODE_READ, file->dir, file, |
2d19bd79 | 2478 | &event_hist_debug_fops); |
7ef224d1 | 2479 | #endif |
21ccc9cd | 2480 | trace_create_file("format", TRACE_MODE_READ, file->dir, call, |
620a30e9 | 2481 | &ftrace_event_format_fops); |
6d723736 | 2482 | |
6c3edaf9 CW |
2483 | #ifdef CONFIG_TRACE_EVENT_INJECT |
2484 | if (call->event.type && call->class->reg) | |
2485 | trace_create_file("inject", 0200, file->dir, file, | |
2486 | &event_inject_fops); | |
2487 | #endif | |
2488 | ||
6d723736 SR |
2489 | return 0; |
2490 | } | |
2491 | ||
2425bcb9 | 2492 | static void remove_event_from_tracers(struct trace_event_call *call) |
ae63b31e | 2493 | { |
7f1d2f82 | 2494 | struct trace_event_file *file; |
ae63b31e SR |
2495 | struct trace_array *tr; |
2496 | ||
2497 | do_for_each_event_file_safe(tr, file) { | |
ae63b31e SR |
2498 | if (file->event_call != call) |
2499 | continue; | |
2500 | ||
f6a84bdc | 2501 | remove_event_file_dir(file); |
ae63b31e SR |
2502 | /* |
2503 | * The do_for_each_event_file_safe() is | |
2504 | * a double loop. After finding the call for this | |
2505 | * trace_array, we use break to jump to the next | |
2506 | * trace_array. | |
2507 | */ | |
2508 | break; | |
2509 | } while_for_each_event_file(); | |
2510 | } | |
2511 | ||
2425bcb9 | 2512 | static void event_remove(struct trace_event_call *call) |
8781915a | 2513 | { |
ae63b31e | 2514 | struct trace_array *tr; |
7f1d2f82 | 2515 | struct trace_event_file *file; |
ae63b31e SR |
2516 | |
2517 | do_for_each_event_file(tr, file) { | |
2518 | if (file->event_call != call) | |
2519 | continue; | |
065e63f9 SRV |
2520 | |
2521 | if (file->flags & EVENT_FILE_FL_WAS_ENABLED) | |
2522 | tr->clear_trace = true; | |
2523 | ||
ae63b31e SR |
2524 | ftrace_event_enable_disable(file, 0); |
2525 | /* | |
2526 | * The do_for_each_event_file() is | |
2527 | * a double loop. After finding the call for this | |
2528 | * trace_array, we use break to jump to the next | |
2529 | * trace_array. | |
2530 | */ | |
2531 | break; | |
2532 | } while_for_each_event_file(); | |
2533 | ||
8781915a | 2534 | if (call->event.funcs) |
9023c930 | 2535 | __unregister_trace_event(&call->event); |
ae63b31e | 2536 | remove_event_from_tracers(call); |
8781915a EG |
2537 | list_del(&call->list); |
2538 | } | |
2539 | ||
2425bcb9 | 2540 | static int event_init(struct trace_event_call *call) |
8781915a EG |
2541 | { |
2542 | int ret = 0; | |
de7b2973 | 2543 | const char *name; |
8781915a | 2544 | |
687fcc4a | 2545 | name = trace_event_name(call); |
de7b2973 | 2546 | if (WARN_ON(!name)) |
8781915a EG |
2547 | return -EINVAL; |
2548 | ||
2549 | if (call->class->raw_init) { | |
2550 | ret = call->class->raw_init(call); | |
2551 | if (ret < 0 && ret != -ENOSYS) | |
3448bac3 | 2552 | pr_warn("Could not initialize trace events/%s\n", name); |
8781915a EG |
2553 | } |
2554 | ||
2555 | return ret; | |
2556 | } | |
2557 | ||
67ead0a6 | 2558 | static int |
2425bcb9 | 2559 | __register_event(struct trace_event_call *call, struct module *mod) |
bd1a5c84 | 2560 | { |
bd1a5c84 | 2561 | int ret; |
6d723736 | 2562 | |
8781915a EG |
2563 | ret = event_init(call); |
2564 | if (ret < 0) | |
2565 | return ret; | |
701970b3 | 2566 | |
ae63b31e | 2567 | list_add(&call->list, &ftrace_events); |
1d18538e SRV |
2568 | if (call->flags & TRACE_EVENT_FL_DYNAMIC) |
2569 | atomic_set(&call->refcnt, 0); | |
2570 | else | |
2571 | call->module = mod; | |
88f70d75 | 2572 | |
ae63b31e | 2573 | return 0; |
bd1a5c84 MH |
2574 | } |
2575 | ||
67ec0d85 | 2576 | static char *eval_replace(char *ptr, struct trace_eval_map *map, int len) |
0c564a53 SRRH |
2577 | { |
2578 | int rlen; | |
2579 | int elen; | |
2580 | ||
67ec0d85 | 2581 | /* Find the length of the eval value as a string */ |
00f4b652 | 2582 | elen = snprintf(ptr, 0, "%ld", map->eval_value); |
0c564a53 SRRH |
2583 | /* Make sure there's enough room to replace the string with the value */ |
2584 | if (len < elen) | |
2585 | return NULL; | |
2586 | ||
00f4b652 | 2587 | snprintf(ptr, elen + 1, "%ld", map->eval_value); |
0c564a53 SRRH |
2588 | |
2589 | /* Get the rest of the string of ptr */ | |
2590 | rlen = strlen(ptr + len); | |
2591 | memmove(ptr + elen, ptr + len, rlen); | |
2592 | /* Make sure we end the new string */ | |
2593 | ptr[elen + rlen] = 0; | |
2594 | ||
2595 | return ptr + elen; | |
2596 | } | |
2597 | ||
2425bcb9 | 2598 | static void update_event_printk(struct trace_event_call *call, |
00f4b652 | 2599 | struct trace_eval_map *map) |
0c564a53 SRRH |
2600 | { |
2601 | char *ptr; | |
2602 | int quote = 0; | |
00f4b652 | 2603 | int len = strlen(map->eval_string); |
0c564a53 SRRH |
2604 | |
2605 | for (ptr = call->print_fmt; *ptr; ptr++) { | |
2606 | if (*ptr == '\\') { | |
2607 | ptr++; | |
2608 | /* paranoid */ | |
2609 | if (!*ptr) | |
2610 | break; | |
2611 | continue; | |
2612 | } | |
2613 | if (*ptr == '"') { | |
2614 | quote ^= 1; | |
2615 | continue; | |
2616 | } | |
2617 | if (quote) | |
2618 | continue; | |
2619 | if (isdigit(*ptr)) { | |
2620 | /* skip numbers */ | |
2621 | do { | |
2622 | ptr++; | |
2623 | /* Check for alpha chars like ULL */ | |
2624 | } while (isalnum(*ptr)); | |
3193899d SRRH |
2625 | if (!*ptr) |
2626 | break; | |
0c564a53 SRRH |
2627 | /* |
2628 | * A number must have some kind of delimiter after | |
2629 | * it, and we can ignore that too. | |
2630 | */ | |
2631 | continue; | |
2632 | } | |
2633 | if (isalpha(*ptr) || *ptr == '_') { | |
00f4b652 | 2634 | if (strncmp(map->eval_string, ptr, len) == 0 && |
0c564a53 | 2635 | !isalnum(ptr[len]) && ptr[len] != '_') { |
67ec0d85 JL |
2636 | ptr = eval_replace(ptr, map, len); |
2637 | /* enum/sizeof string smaller than value */ | |
0c564a53 SRRH |
2638 | if (WARN_ON_ONCE(!ptr)) |
2639 | return; | |
2640 | /* | |
67ec0d85 | 2641 | * No need to decrement here, as eval_replace() |
0c564a53 | 2642 | * returns the pointer to the character passed |
67ec0d85 | 2643 | * the eval, and two evals can not be placed |
0c564a53 SRRH |
2644 | * back to back without something in between. |
2645 | * We can skip that something in between. | |
2646 | */ | |
2647 | continue; | |
2648 | } | |
2649 | skip_more: | |
2650 | do { | |
2651 | ptr++; | |
2652 | } while (isalnum(*ptr) || *ptr == '_'); | |
3193899d SRRH |
2653 | if (!*ptr) |
2654 | break; | |
0c564a53 SRRH |
2655 | /* |
2656 | * If what comes after this variable is a '.' or | |
2657 | * '->' then we can continue to ignore that string. | |
2658 | */ | |
2659 | if (*ptr == '.' || (ptr[0] == '-' && ptr[1] == '>')) { | |
2660 | ptr += *ptr == '.' ? 1 : 2; | |
3193899d SRRH |
2661 | if (!*ptr) |
2662 | break; | |
0c564a53 SRRH |
2663 | goto skip_more; |
2664 | } | |
2665 | /* | |
2666 | * Once again, we can skip the delimiter that came | |
2667 | * after the string. | |
2668 | */ | |
2669 | continue; | |
2670 | } | |
2671 | } | |
2672 | } | |
2673 | ||
795301d3 SRG |
2674 | static void add_str_to_module(struct module *module, char *str) |
2675 | { | |
2676 | struct module_string *modstr; | |
2677 | ||
2678 | modstr = kmalloc(sizeof(*modstr), GFP_KERNEL); | |
2679 | ||
2680 | /* | |
2681 | * If we failed to allocate memory here, then we'll just | |
2682 | * let the str memory leak when the module is removed. | |
2683 | * If this fails to allocate, there's worse problems than | |
2684 | * a leaked string on module removal. | |
2685 | */ | |
2686 | if (WARN_ON_ONCE(!modstr)) | |
2687 | return; | |
2688 | ||
2689 | modstr->module = module; | |
2690 | modstr->str = str; | |
2691 | ||
2692 | list_add(&modstr->next, &module_strings); | |
2693 | } | |
2694 | ||
b3bc8547 SRG |
2695 | static void update_event_fields(struct trace_event_call *call, |
2696 | struct trace_eval_map *map) | |
2697 | { | |
2698 | struct ftrace_event_field *field; | |
2699 | struct list_head *head; | |
2700 | char *ptr; | |
795301d3 | 2701 | char *str; |
b3bc8547 SRG |
2702 | int len = strlen(map->eval_string); |
2703 | ||
795301d3 SRG |
2704 | /* Dynamic events should never have field maps */ |
2705 | if (WARN_ON_ONCE(call->flags & TRACE_EVENT_FL_DYNAMIC)) | |
2706 | return; | |
2707 | ||
b3bc8547 SRG |
2708 | head = trace_get_fields(call); |
2709 | list_for_each_entry(field, head, link) { | |
2710 | ptr = strchr(field->type, '['); | |
2711 | if (!ptr) | |
2712 | continue; | |
2713 | ptr++; | |
2714 | ||
2715 | if (!isalpha(*ptr) && *ptr != '_') | |
2716 | continue; | |
2717 | ||
2718 | if (strncmp(map->eval_string, ptr, len) != 0) | |
2719 | continue; | |
2720 | ||
795301d3 SRG |
2721 | str = kstrdup(field->type, GFP_KERNEL); |
2722 | if (WARN_ON_ONCE(!str)) | |
2723 | return; | |
2724 | ptr = str + (ptr - field->type); | |
b3bc8547 SRG |
2725 | ptr = eval_replace(ptr, map, len); |
2726 | /* enum/sizeof string smaller than value */ | |
795301d3 SRG |
2727 | if (WARN_ON_ONCE(!ptr)) { |
2728 | kfree(str); | |
2729 | continue; | |
2730 | } | |
2731 | ||
2732 | /* | |
2733 | * If the event is part of a module, then we need to free the string | |
2734 | * when the module is removed. Otherwise, it will stay allocated | |
2735 | * until a reboot. | |
2736 | */ | |
2737 | if (call->module) | |
2738 | add_str_to_module(call->module, str); | |
2739 | ||
2740 | field->type = str; | |
b3bc8547 SRG |
2741 | } |
2742 | } | |
2743 | ||
f57a4143 | 2744 | void trace_event_eval_update(struct trace_eval_map **map, int len) |
0c564a53 | 2745 | { |
2425bcb9 | 2746 | struct trace_event_call *call, *p; |
0c564a53 | 2747 | const char *last_system = NULL; |
1ebe1eaf | 2748 | bool first = false; |
0c564a53 SRRH |
2749 | int last_i; |
2750 | int i; | |
2751 | ||
2752 | down_write(&trace_event_sem); | |
2753 | list_for_each_entry_safe(call, p, &ftrace_events, list) { | |
2754 | /* events are usually grouped together with systems */ | |
2755 | if (!last_system || call->class->system != last_system) { | |
1ebe1eaf | 2756 | first = true; |
0c564a53 SRRH |
2757 | last_i = 0; |
2758 | last_system = call->class->system; | |
2759 | } | |
2760 | ||
1ebe1eaf | 2761 | /* |
f2cc020d | 2762 | * Since calls are grouped by systems, the likelihood that the |
1ebe1eaf | 2763 | * next call in the iteration belongs to the same system as the |
2b5894cc | 2764 | * previous call is high. As an optimization, we skip searching |
1ebe1eaf SRV |
2765 | * for a map[] that matches the call's system if the last call |
2766 | * was from the same system. That's what last_i is for. If the | |
2767 | * call has the same system as the previous call, then last_i | |
2768 | * will be the index of the first map[] that has a matching | |
2769 | * system. | |
2770 | */ | |
0c564a53 SRRH |
2771 | for (i = last_i; i < len; i++) { |
2772 | if (call->class->system == map[i]->system) { | |
2773 | /* Save the first system if need be */ | |
1ebe1eaf | 2774 | if (first) { |
0c564a53 | 2775 | last_i = i; |
1ebe1eaf SRV |
2776 | first = false; |
2777 | } | |
0c564a53 | 2778 | update_event_printk(call, map[i]); |
b3bc8547 | 2779 | update_event_fields(call, map[i]); |
0c564a53 SRRH |
2780 | } |
2781 | } | |
2782 | } | |
2783 | up_write(&trace_event_sem); | |
2784 | } | |
2785 | ||
7f1d2f82 | 2786 | static struct trace_event_file * |
2425bcb9 | 2787 | trace_create_new_event(struct trace_event_call *call, |
da511bf3 SRRH |
2788 | struct trace_array *tr) |
2789 | { | |
6cb20650 SRV |
2790 | struct trace_pid_list *no_pid_list; |
2791 | struct trace_pid_list *pid_list; | |
7f1d2f82 | 2792 | struct trace_event_file *file; |
6cb20650 | 2793 | unsigned int first; |
da511bf3 SRRH |
2794 | |
2795 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); | |
2796 | if (!file) | |
2797 | return NULL; | |
2798 | ||
6cb20650 SRV |
2799 | pid_list = rcu_dereference_protected(tr->filtered_pids, |
2800 | lockdep_is_held(&event_mutex)); | |
2801 | no_pid_list = rcu_dereference_protected(tr->filtered_no_pids, | |
2802 | lockdep_is_held(&event_mutex)); | |
2803 | ||
2804 | if (!trace_pid_list_first(pid_list, &first) || | |
27ff768f | 2805 | !trace_pid_list_first(no_pid_list, &first)) |
6cb20650 SRV |
2806 | file->flags |= EVENT_FILE_FL_PID_FILTER; |
2807 | ||
da511bf3 SRRH |
2808 | file->event_call = call; |
2809 | file->tr = tr; | |
2810 | atomic_set(&file->sm_ref, 0); | |
85f2b082 TZ |
2811 | atomic_set(&file->tm_ref, 0); |
2812 | INIT_LIST_HEAD(&file->triggers); | |
da511bf3 SRRH |
2813 | list_add(&file->list, &tr->events); |
2814 | ||
2815 | return file; | |
2816 | } | |
2817 | ||
a01fdc89 SRG |
2818 | #define MAX_BOOT_TRIGGERS 32 |
2819 | ||
2820 | static struct boot_triggers { | |
2821 | const char *event; | |
2822 | char *trigger; | |
2823 | } bootup_triggers[MAX_BOOT_TRIGGERS]; | |
2824 | ||
2825 | static char bootup_trigger_buf[COMMAND_LINE_SIZE]; | |
2826 | static int nr_boot_triggers; | |
2827 | ||
2828 | static __init int setup_trace_triggers(char *str) | |
2829 | { | |
2830 | char *trigger; | |
2831 | char *buf; | |
2832 | int i; | |
2833 | ||
2834 | strlcpy(bootup_trigger_buf, str, COMMAND_LINE_SIZE); | |
2835 | ring_buffer_expanded = true; | |
2836 | disable_tracing_selftest("running event triggers"); | |
2837 | ||
2838 | buf = bootup_trigger_buf; | |
2839 | for (i = 0; i < MAX_BOOT_TRIGGERS; i++) { | |
2840 | trigger = strsep(&buf, ","); | |
2841 | if (!trigger) | |
2842 | break; | |
2843 | bootup_triggers[i].event = strsep(&trigger, "."); | |
e6745a4d | 2844 | bootup_triggers[i].trigger = trigger; |
a01fdc89 SRG |
2845 | if (!bootup_triggers[i].trigger) |
2846 | break; | |
2847 | } | |
2848 | ||
2849 | nr_boot_triggers = i; | |
2850 | return 1; | |
2851 | } | |
2852 | __setup("trace_trigger=", setup_trace_triggers); | |
a01fdc89 | 2853 | |
ae63b31e SR |
2854 | /* Add an event to a trace directory */ |
2855 | static int | |
2425bcb9 | 2856 | __trace_add_new_event(struct trace_event_call *call, struct trace_array *tr) |
ae63b31e | 2857 | { |
7f1d2f82 | 2858 | struct trace_event_file *file; |
ae63b31e | 2859 | |
da511bf3 | 2860 | file = trace_create_new_event(call, tr); |
ae63b31e SR |
2861 | if (!file) |
2862 | return -ENOMEM; | |
2863 | ||
a838deab MH |
2864 | if (eventdir_initialized) |
2865 | return event_create_dir(tr->event_dir, file); | |
2866 | else | |
2867 | return event_define_fields(call); | |
ae63b31e SR |
2868 | } |
2869 | ||
a01fdc89 SRG |
2870 | static void trace_early_triggers(struct trace_event_file *file, const char *name) |
2871 | { | |
2872 | int ret; | |
2873 | int i; | |
2874 | ||
2875 | for (i = 0; i < nr_boot_triggers; i++) { | |
2876 | if (strcmp(name, bootup_triggers[i].event)) | |
2877 | continue; | |
2878 | mutex_lock(&event_mutex); | |
2879 | ret = trigger_process_regex(file, bootup_triggers[i].trigger); | |
2880 | mutex_unlock(&event_mutex); | |
2881 | if (ret) | |
2882 | pr_err("Failed to register trigger '%s' on event %s\n", | |
2883 | bootup_triggers[i].trigger, | |
2884 | bootup_triggers[i].event); | |
2885 | } | |
2886 | } | |
a01fdc89 | 2887 | |
77248221 | 2888 | /* |
f2cc020d | 2889 | * Just create a descriptor for early init. A descriptor is required |
77248221 SR |
2890 | * for enabling events at boot. We want to enable events before |
2891 | * the filesystem is initialized. | |
2892 | */ | |
ce66f613 | 2893 | static int |
2425bcb9 | 2894 | __trace_early_add_new_event(struct trace_event_call *call, |
77248221 SR |
2895 | struct trace_array *tr) |
2896 | { | |
7f1d2f82 | 2897 | struct trace_event_file *file; |
a01fdc89 | 2898 | int ret; |
77248221 | 2899 | |
da511bf3 | 2900 | file = trace_create_new_event(call, tr); |
77248221 SR |
2901 | if (!file) |
2902 | return -ENOMEM; | |
2903 | ||
a01fdc89 SRG |
2904 | ret = event_define_fields(call); |
2905 | if (ret) | |
2906 | return ret; | |
2907 | ||
2908 | trace_early_triggers(file, trace_event_name(call)); | |
2909 | ||
2910 | return 0; | |
77248221 SR |
2911 | } |
2912 | ||
ae63b31e | 2913 | struct ftrace_module_file_ops; |
2425bcb9 | 2914 | static void __add_event_to_tracers(struct trace_event_call *call); |
ae63b31e | 2915 | |
7e1413ed SRV |
2916 | /* Add an additional event_call dynamically */ |
2917 | int trace_add_event_call(struct trace_event_call *call) | |
bd1a5c84 MH |
2918 | { |
2919 | int ret; | |
fc800a10 MH |
2920 | lockdep_assert_held(&event_mutex); |
2921 | ||
12ecef0c | 2922 | mutex_lock(&trace_types_lock); |
701970b3 | 2923 | |
ae63b31e SR |
2924 | ret = __register_event(call, NULL); |
2925 | if (ret >= 0) | |
779c5e37 | 2926 | __add_event_to_tracers(call); |
a2ca5e03 | 2927 | |
a8227415 | 2928 | mutex_unlock(&trace_types_lock); |
fc800a10 MH |
2929 | return ret; |
2930 | } | |
8bcd0663 | 2931 | EXPORT_SYMBOL_GPL(trace_add_event_call); |
fc800a10 | 2932 | |
4fead8e4 | 2933 | /* |
a8227415 AL |
2934 | * Must be called under locking of trace_types_lock, event_mutex and |
2935 | * trace_event_sem. | |
4fead8e4 | 2936 | */ |
2425bcb9 | 2937 | static void __trace_remove_event_call(struct trace_event_call *call) |
bd1a5c84 | 2938 | { |
8781915a | 2939 | event_remove(call); |
bd1a5c84 | 2940 | trace_destroy_fields(call); |
57375747 ON |
2941 | free_event_filter(call->filter); |
2942 | call->filter = NULL; | |
bd1a5c84 MH |
2943 | } |
2944 | ||
2425bcb9 | 2945 | static int probe_remove_event_call(struct trace_event_call *call) |
2816c551 ON |
2946 | { |
2947 | struct trace_array *tr; | |
7f1d2f82 | 2948 | struct trace_event_file *file; |
2816c551 ON |
2949 | |
2950 | #ifdef CONFIG_PERF_EVENTS | |
2951 | if (call->perf_refcount) | |
2952 | return -EBUSY; | |
2953 | #endif | |
2954 | do_for_each_event_file(tr, file) { | |
2955 | if (file->event_call != call) | |
2956 | continue; | |
2957 | /* | |
2958 | * We can't rely on ftrace_event_enable_disable(enable => 0) | |
5d6ad960 | 2959 | * we are going to do, EVENT_FILE_FL_SOFT_MODE can suppress |
2816c551 ON |
2960 | * TRACE_REG_UNREGISTER. |
2961 | */ | |
5d6ad960 | 2962 | if (file->flags & EVENT_FILE_FL_ENABLED) |
4313e5a6 SRG |
2963 | goto busy; |
2964 | ||
2965 | if (file->flags & EVENT_FILE_FL_WAS_ENABLED) | |
2966 | tr->clear_trace = true; | |
2ba64035 SRRH |
2967 | /* |
2968 | * The do_for_each_event_file_safe() is | |
2969 | * a double loop. After finding the call for this | |
2970 | * trace_array, we use break to jump to the next | |
2971 | * trace_array. | |
2972 | */ | |
2816c551 ON |
2973 | break; |
2974 | } while_for_each_event_file(); | |
2975 | ||
2976 | __trace_remove_event_call(call); | |
2977 | ||
2978 | return 0; | |
4313e5a6 SRG |
2979 | busy: |
2980 | /* No need to clear the trace now */ | |
2981 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
2982 | tr->clear_trace = false; | |
2983 | } | |
2984 | return -EBUSY; | |
2816c551 ON |
2985 | } |
2986 | ||
7e1413ed SRV |
2987 | /* Remove an event_call */ |
2988 | int trace_remove_event_call(struct trace_event_call *call) | |
bd1a5c84 | 2989 | { |
2816c551 ON |
2990 | int ret; |
2991 | ||
fc800a10 MH |
2992 | lockdep_assert_held(&event_mutex); |
2993 | ||
12ecef0c | 2994 | mutex_lock(&trace_types_lock); |
52f6ad6d | 2995 | down_write(&trace_event_sem); |
2816c551 | 2996 | ret = probe_remove_event_call(call); |
52f6ad6d | 2997 | up_write(&trace_event_sem); |
a8227415 | 2998 | mutex_unlock(&trace_types_lock); |
fc800a10 MH |
2999 | |
3000 | return ret; | |
3001 | } | |
8bcd0663 | 3002 | EXPORT_SYMBOL_GPL(trace_remove_event_call); |
fc800a10 | 3003 | |
bd1a5c84 MH |
3004 | #define for_each_event(event, start, end) \ |
3005 | for (event = start; \ | |
3006 | (unsigned long)event < (unsigned long)end; \ | |
3007 | event++) | |
3008 | ||
3009 | #ifdef CONFIG_MODULES | |
3010 | ||
6d723736 SR |
3011 | static void trace_module_add_events(struct module *mod) |
3012 | { | |
2425bcb9 | 3013 | struct trace_event_call **call, **start, **end; |
6d723736 | 3014 | |
45ab2813 SRRH |
3015 | if (!mod->num_trace_events) |
3016 | return; | |
3017 | ||
3018 | /* Don't add infrastructure for mods without tracepoints */ | |
3019 | if (trace_module_has_bad_taint(mod)) { | |
3020 | pr_err("%s: module has bad taint, not creating trace events\n", | |
3021 | mod->name); | |
3022 | return; | |
3023 | } | |
3024 | ||
6d723736 SR |
3025 | start = mod->trace_events; |
3026 | end = mod->trace_events + mod->num_trace_events; | |
3027 | ||
6d723736 | 3028 | for_each_event(call, start, end) { |
ae63b31e | 3029 | __register_event(*call, mod); |
779c5e37 | 3030 | __add_event_to_tracers(*call); |
6d723736 SR |
3031 | } |
3032 | } | |
3033 | ||
3034 | static void trace_module_remove_events(struct module *mod) | |
3035 | { | |
2425bcb9 | 3036 | struct trace_event_call *call, *p; |
795301d3 | 3037 | struct module_string *modstr, *m; |
6d723736 | 3038 | |
52f6ad6d | 3039 | down_write(&trace_event_sem); |
6d723736 | 3040 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1d18538e SRV |
3041 | if ((call->flags & TRACE_EVENT_FL_DYNAMIC) || !call->module) |
3042 | continue; | |
3043 | if (call->module == mod) | |
bd1a5c84 | 3044 | __trace_remove_event_call(call); |
6d723736 | 3045 | } |
795301d3 SRG |
3046 | /* Check for any strings allocade for this module */ |
3047 | list_for_each_entry_safe(modstr, m, &module_strings, next) { | |
3048 | if (modstr->module != mod) | |
3049 | continue; | |
3050 | list_del(&modstr->next); | |
3051 | kfree(modstr->str); | |
3052 | kfree(modstr); | |
3053 | } | |
52f6ad6d | 3054 | up_write(&trace_event_sem); |
9456f0fa SR |
3055 | |
3056 | /* | |
3057 | * It is safest to reset the ring buffer if the module being unloaded | |
873c642f SRRH |
3058 | * registered any events that were used. The only worry is if |
3059 | * a new module gets loaded, and takes on the same id as the events | |
3060 | * of this module. When printing out the buffer, traced events left | |
3061 | * over from this module may be passed to the new module events and | |
3062 | * unexpected results may occur. | |
9456f0fa | 3063 | */ |
e18eb878 | 3064 | tracing_reset_all_online_cpus_unlocked(); |
6d723736 SR |
3065 | } |
3066 | ||
61f919a1 SR |
3067 | static int trace_module_notify(struct notifier_block *self, |
3068 | unsigned long val, void *data) | |
6d723736 SR |
3069 | { |
3070 | struct module *mod = data; | |
3071 | ||
3072 | mutex_lock(&event_mutex); | |
12ecef0c | 3073 | mutex_lock(&trace_types_lock); |
6d723736 SR |
3074 | switch (val) { |
3075 | case MODULE_STATE_COMING: | |
3076 | trace_module_add_events(mod); | |
3077 | break; | |
3078 | case MODULE_STATE_GOING: | |
3079 | trace_module_remove_events(mod); | |
3080 | break; | |
3081 | } | |
a8227415 | 3082 | mutex_unlock(&trace_types_lock); |
12ecef0c | 3083 | mutex_unlock(&event_mutex); |
fd994989 | 3084 | |
0340a6b7 | 3085 | return NOTIFY_OK; |
1473e441 | 3086 | } |
315326c1 | 3087 | |
836d481e ON |
3088 | static struct notifier_block trace_module_nb = { |
3089 | .notifier_call = trace_module_notify, | |
3673b8e4 | 3090 | .priority = 1, /* higher than trace.c module notify */ |
836d481e | 3091 | }; |
61f919a1 | 3092 | #endif /* CONFIG_MODULES */ |
1473e441 | 3093 | |
ae63b31e SR |
3094 | /* Create a new event directory structure for a trace directory. */ |
3095 | static void | |
3096 | __trace_add_event_dirs(struct trace_array *tr) | |
3097 | { | |
2425bcb9 | 3098 | struct trace_event_call *call; |
ae63b31e SR |
3099 | int ret; |
3100 | ||
3101 | list_for_each_entry(call, &ftrace_events, list) { | |
620a30e9 | 3102 | ret = __trace_add_new_event(call, tr); |
ae63b31e | 3103 | if (ret < 0) |
3448bac3 | 3104 | pr_warn("Could not create directory for event %s\n", |
687fcc4a | 3105 | trace_event_name(call)); |
ae63b31e SR |
3106 | } |
3107 | } | |
3108 | ||
3c96529c | 3109 | /* Returns any file that matches the system and event */ |
7f1d2f82 | 3110 | struct trace_event_file * |
3c96529c | 3111 | __find_event_file(struct trace_array *tr, const char *system, const char *event) |
3cd715de | 3112 | { |
7f1d2f82 | 3113 | struct trace_event_file *file; |
2425bcb9 | 3114 | struct trace_event_call *call; |
de7b2973 | 3115 | const char *name; |
3cd715de SRRH |
3116 | |
3117 | list_for_each_entry(file, &tr->events, list) { | |
3118 | ||
3119 | call = file->event_call; | |
687fcc4a | 3120 | name = trace_event_name(call); |
3cd715de | 3121 | |
3c96529c | 3122 | if (!name || !call->class) |
3cd715de SRRH |
3123 | continue; |
3124 | ||
de7b2973 | 3125 | if (strcmp(event, name) == 0 && |
3cd715de SRRH |
3126 | strcmp(system, call->class->system) == 0) |
3127 | return file; | |
3128 | } | |
3129 | return NULL; | |
3130 | } | |
3131 | ||
3c96529c SRV |
3132 | /* Returns valid trace event files that match system and event */ |
3133 | struct trace_event_file * | |
3134 | find_event_file(struct trace_array *tr, const char *system, const char *event) | |
3135 | { | |
3136 | struct trace_event_file *file; | |
3137 | ||
3138 | file = __find_event_file(tr, system, event); | |
3139 | if (!file || !file->event_call->class->reg || | |
3140 | file->event_call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) | |
3141 | return NULL; | |
3142 | ||
3143 | return file; | |
3144 | } | |
3145 | ||
e3e2a2cc TZ |
3146 | /** |
3147 | * trace_get_event_file - Find and return a trace event file | |
3148 | * @instance: The name of the trace instance containing the event | |
3149 | * @system: The name of the system containing the event | |
3150 | * @event: The name of the event | |
3151 | * | |
3152 | * Return a trace event file given the trace instance name, trace | |
3153 | * system, and trace event name. If the instance name is NULL, it | |
3154 | * refers to the top-level trace array. | |
3155 | * | |
3156 | * This function will look it up and return it if found, after calling | |
3157 | * trace_array_get() to prevent the instance from going away, and | |
3158 | * increment the event's module refcount to prevent it from being | |
3159 | * removed. | |
3160 | * | |
3161 | * To release the file, call trace_put_event_file(), which will call | |
3162 | * trace_array_put() and decrement the event's module refcount. | |
3163 | * | |
3164 | * Return: The trace event on success, ERR_PTR otherwise. | |
3165 | */ | |
3166 | struct trace_event_file *trace_get_event_file(const char *instance, | |
3167 | const char *system, | |
3168 | const char *event) | |
3169 | { | |
3170 | struct trace_array *tr = top_trace_array(); | |
3171 | struct trace_event_file *file = NULL; | |
3172 | int ret = -EINVAL; | |
3173 | ||
3174 | if (instance) { | |
3175 | tr = trace_array_find_get(instance); | |
3176 | if (!tr) | |
3177 | return ERR_PTR(-ENOENT); | |
3178 | } else { | |
3179 | ret = trace_array_get(tr); | |
3180 | if (ret) | |
3181 | return ERR_PTR(ret); | |
3182 | } | |
3183 | ||
3184 | mutex_lock(&event_mutex); | |
3185 | ||
3186 | file = find_event_file(tr, system, event); | |
3187 | if (!file) { | |
3188 | trace_array_put(tr); | |
3189 | ret = -EINVAL; | |
3190 | goto out; | |
3191 | } | |
3192 | ||
3193 | /* Don't let event modules unload while in use */ | |
1d18538e | 3194 | ret = trace_event_try_get_ref(file->event_call); |
e3e2a2cc TZ |
3195 | if (!ret) { |
3196 | trace_array_put(tr); | |
3197 | ret = -EBUSY; | |
3198 | goto out; | |
3199 | } | |
3200 | ||
3201 | ret = 0; | |
3202 | out: | |
3203 | mutex_unlock(&event_mutex); | |
3204 | ||
3205 | if (ret) | |
3206 | file = ERR_PTR(ret); | |
3207 | ||
3208 | return file; | |
3209 | } | |
3210 | EXPORT_SYMBOL_GPL(trace_get_event_file); | |
3211 | ||
3212 | /** | |
3213 | * trace_put_event_file - Release a file from trace_get_event_file() | |
3214 | * @file: The trace event file | |
3215 | * | |
3216 | * If a file was retrieved using trace_get_event_file(), this should | |
3217 | * be called when it's no longer needed. It will cancel the previous | |
3218 | * trace_array_get() called by that function, and decrement the | |
3219 | * event's module refcount. | |
3220 | */ | |
3221 | void trace_put_event_file(struct trace_event_file *file) | |
3222 | { | |
3223 | mutex_lock(&event_mutex); | |
1d18538e | 3224 | trace_event_put_ref(file->event_call); |
e3e2a2cc TZ |
3225 | mutex_unlock(&event_mutex); |
3226 | ||
3227 | trace_array_put(file->tr); | |
3228 | } | |
3229 | EXPORT_SYMBOL_GPL(trace_put_event_file); | |
3230 | ||
2875a08b SRRH |
3231 | #ifdef CONFIG_DYNAMIC_FTRACE |
3232 | ||
3233 | /* Avoid typos */ | |
3234 | #define ENABLE_EVENT_STR "enable_event" | |
3235 | #define DISABLE_EVENT_STR "disable_event" | |
3236 | ||
3237 | struct event_probe_data { | |
7f1d2f82 | 3238 | struct trace_event_file *file; |
2875a08b SRRH |
3239 | unsigned long count; |
3240 | int ref; | |
3241 | bool enable; | |
3242 | }; | |
3243 | ||
41794f19 SRV |
3244 | static void update_event_probe(struct event_probe_data *data) |
3245 | { | |
3246 | if (data->enable) | |
3247 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); | |
3248 | else | |
3249 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); | |
3250 | } | |
3251 | ||
3cd715de | 3252 | static void |
bca6c8d0 | 3253 | event_enable_probe(unsigned long ip, unsigned long parent_ip, |
b5f081b5 | 3254 | struct trace_array *tr, struct ftrace_probe_ops *ops, |
6e444319 | 3255 | void *data) |
3cd715de | 3256 | { |
6e444319 SRV |
3257 | struct ftrace_func_mapper *mapper = data; |
3258 | struct event_probe_data *edata; | |
41794f19 | 3259 | void **pdata; |
3cd715de | 3260 | |
41794f19 SRV |
3261 | pdata = ftrace_func_mapper_find_ip(mapper, ip); |
3262 | if (!pdata || !*pdata) | |
3cd715de SRRH |
3263 | return; |
3264 | ||
6e444319 SRV |
3265 | edata = *pdata; |
3266 | update_event_probe(edata); | |
3cd715de SRRH |
3267 | } |
3268 | ||
3269 | static void | |
bca6c8d0 | 3270 | event_enable_count_probe(unsigned long ip, unsigned long parent_ip, |
b5f081b5 | 3271 | struct trace_array *tr, struct ftrace_probe_ops *ops, |
6e444319 | 3272 | void *data) |
3cd715de | 3273 | { |
6e444319 SRV |
3274 | struct ftrace_func_mapper *mapper = data; |
3275 | struct event_probe_data *edata; | |
41794f19 | 3276 | void **pdata; |
3cd715de | 3277 | |
41794f19 SRV |
3278 | pdata = ftrace_func_mapper_find_ip(mapper, ip); |
3279 | if (!pdata || !*pdata) | |
3cd715de SRRH |
3280 | return; |
3281 | ||
6e444319 | 3282 | edata = *pdata; |
41794f19 | 3283 | |
6e444319 | 3284 | if (!edata->count) |
3cd715de SRRH |
3285 | return; |
3286 | ||
3287 | /* Skip if the event is in a state we want to switch to */ | |
6e444319 | 3288 | if (edata->enable == !(edata->file->flags & EVENT_FILE_FL_SOFT_DISABLED)) |
3cd715de SRRH |
3289 | return; |
3290 | ||
6e444319 SRV |
3291 | if (edata->count != -1) |
3292 | (edata->count)--; | |
3cd715de | 3293 | |
6e444319 | 3294 | update_event_probe(edata); |
3cd715de SRRH |
3295 | } |
3296 | ||
3297 | static int | |
3298 | event_enable_print(struct seq_file *m, unsigned long ip, | |
6e444319 | 3299 | struct ftrace_probe_ops *ops, void *data) |
3cd715de | 3300 | { |
6e444319 SRV |
3301 | struct ftrace_func_mapper *mapper = data; |
3302 | struct event_probe_data *edata; | |
41794f19 SRV |
3303 | void **pdata; |
3304 | ||
3305 | pdata = ftrace_func_mapper_find_ip(mapper, ip); | |
3306 | ||
3307 | if (WARN_ON_ONCE(!pdata || !*pdata)) | |
3308 | return 0; | |
3309 | ||
6e444319 | 3310 | edata = *pdata; |
3cd715de SRRH |
3311 | |
3312 | seq_printf(m, "%ps:", (void *)ip); | |
3313 | ||
3314 | seq_printf(m, "%s:%s:%s", | |
6e444319 SRV |
3315 | edata->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR, |
3316 | edata->file->event_call->class->system, | |
3317 | trace_event_name(edata->file->event_call)); | |
3cd715de | 3318 | |
6e444319 | 3319 | if (edata->count == -1) |
fa6f0cc7 | 3320 | seq_puts(m, ":unlimited\n"); |
3cd715de | 3321 | else |
6e444319 | 3322 | seq_printf(m, ":count=%ld\n", edata->count); |
3cd715de SRRH |
3323 | |
3324 | return 0; | |
3325 | } | |
3326 | ||
3327 | static int | |
b5f081b5 | 3328 | event_enable_init(struct ftrace_probe_ops *ops, struct trace_array *tr, |
6e444319 | 3329 | unsigned long ip, void *init_data, void **data) |
3cd715de | 3330 | { |
6e444319 SRV |
3331 | struct ftrace_func_mapper *mapper = *data; |
3332 | struct event_probe_data *edata = init_data; | |
41794f19 SRV |
3333 | int ret; |
3334 | ||
6e444319 SRV |
3335 | if (!mapper) { |
3336 | mapper = allocate_ftrace_func_mapper(); | |
3337 | if (!mapper) | |
3338 | return -ENODEV; | |
3339 | *data = mapper; | |
3340 | } | |
3341 | ||
3342 | ret = ftrace_func_mapper_add_ip(mapper, ip, edata); | |
41794f19 SRV |
3343 | if (ret < 0) |
3344 | return ret; | |
3cd715de | 3345 | |
6e444319 SRV |
3346 | edata->ref++; |
3347 | ||
3348 | return 0; | |
3349 | } | |
3350 | ||
3351 | static int free_probe_data(void *data) | |
3352 | { | |
3353 | struct event_probe_data *edata = data; | |
41794f19 | 3354 | |
6e444319 SRV |
3355 | edata->ref--; |
3356 | if (!edata->ref) { | |
3357 | /* Remove the SOFT_MODE flag */ | |
3358 | __ftrace_event_enable_disable(edata->file, 0, 1); | |
1d18538e | 3359 | trace_event_put_ref(edata->file->event_call); |
6e444319 SRV |
3360 | kfree(edata); |
3361 | } | |
3cd715de SRRH |
3362 | return 0; |
3363 | } | |
3364 | ||
3365 | static void | |
b5f081b5 | 3366 | event_enable_free(struct ftrace_probe_ops *ops, struct trace_array *tr, |
6e444319 | 3367 | unsigned long ip, void *data) |
3cd715de | 3368 | { |
6e444319 SRV |
3369 | struct ftrace_func_mapper *mapper = data; |
3370 | struct event_probe_data *edata; | |
3371 | ||
3372 | if (!ip) { | |
3373 | if (!mapper) | |
3374 | return; | |
3375 | free_ftrace_func_mapper(mapper, free_probe_data); | |
3376 | return; | |
3377 | } | |
41794f19 | 3378 | |
6e444319 | 3379 | edata = ftrace_func_mapper_remove_ip(mapper, ip); |
41794f19 | 3380 | |
6e444319 | 3381 | if (WARN_ON_ONCE(!edata)) |
41794f19 | 3382 | return; |
3cd715de | 3383 | |
6e444319 | 3384 | if (WARN_ON_ONCE(edata->ref <= 0)) |
3cd715de SRRH |
3385 | return; |
3386 | ||
6e444319 | 3387 | free_probe_data(edata); |
3cd715de SRRH |
3388 | } |
3389 | ||
3390 | static struct ftrace_probe_ops event_enable_probe_ops = { | |
3391 | .func = event_enable_probe, | |
3392 | .print = event_enable_print, | |
3393 | .init = event_enable_init, | |
3394 | .free = event_enable_free, | |
3395 | }; | |
3396 | ||
3397 | static struct ftrace_probe_ops event_enable_count_probe_ops = { | |
3398 | .func = event_enable_count_probe, | |
3399 | .print = event_enable_print, | |
3400 | .init = event_enable_init, | |
3401 | .free = event_enable_free, | |
3402 | }; | |
3403 | ||
3404 | static struct ftrace_probe_ops event_disable_probe_ops = { | |
3405 | .func = event_enable_probe, | |
3406 | .print = event_enable_print, | |
3407 | .init = event_enable_init, | |
3408 | .free = event_enable_free, | |
3409 | }; | |
3410 | ||
3411 | static struct ftrace_probe_ops event_disable_count_probe_ops = { | |
3412 | .func = event_enable_count_probe, | |
3413 | .print = event_enable_print, | |
3414 | .init = event_enable_init, | |
3415 | .free = event_enable_free, | |
3416 | }; | |
3417 | ||
3418 | static int | |
04ec7bb6 | 3419 | event_enable_func(struct trace_array *tr, struct ftrace_hash *hash, |
3cd715de SRRH |
3420 | char *glob, char *cmd, char *param, int enabled) |
3421 | { | |
7f1d2f82 | 3422 | struct trace_event_file *file; |
3cd715de SRRH |
3423 | struct ftrace_probe_ops *ops; |
3424 | struct event_probe_data *data; | |
3425 | const char *system; | |
3426 | const char *event; | |
3427 | char *number; | |
3428 | bool enable; | |
3429 | int ret; | |
3430 | ||
dc81e5e3 YY |
3431 | if (!tr) |
3432 | return -ENODEV; | |
3433 | ||
3cd715de | 3434 | /* hash funcs only work with set_ftrace_filter */ |
8092e808 | 3435 | if (!enabled || !param) |
3cd715de SRRH |
3436 | return -EINVAL; |
3437 | ||
3438 | system = strsep(¶m, ":"); | |
3439 | if (!param) | |
3440 | return -EINVAL; | |
3441 | ||
3442 | event = strsep(¶m, ":"); | |
3443 | ||
3444 | mutex_lock(&event_mutex); | |
3445 | ||
3446 | ret = -EINVAL; | |
3447 | file = find_event_file(tr, system, event); | |
3448 | if (!file) | |
3449 | goto out; | |
3450 | ||
3451 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; | |
3452 | ||
3453 | if (enable) | |
3454 | ops = param ? &event_enable_count_probe_ops : &event_enable_probe_ops; | |
3455 | else | |
3456 | ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops; | |
3457 | ||
3458 | if (glob[0] == '!') { | |
7b60f3d8 | 3459 | ret = unregister_ftrace_function_probe_func(glob+1, tr, ops); |
3cd715de SRRH |
3460 | goto out; |
3461 | } | |
3462 | ||
3463 | ret = -ENOMEM; | |
41794f19 | 3464 | |
3cd715de SRRH |
3465 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
3466 | if (!data) | |
3467 | goto out; | |
3468 | ||
3469 | data->enable = enable; | |
3470 | data->count = -1; | |
3471 | data->file = file; | |
3472 | ||
3473 | if (!param) | |
3474 | goto out_reg; | |
3475 | ||
3476 | number = strsep(¶m, ":"); | |
3477 | ||
3478 | ret = -EINVAL; | |
3479 | if (!strlen(number)) | |
3480 | goto out_free; | |
3481 | ||
3482 | /* | |
3483 | * We use the callback data field (which is a pointer) | |
3484 | * as our counter. | |
3485 | */ | |
3486 | ret = kstrtoul(number, 0, &data->count); | |
3487 | if (ret) | |
3488 | goto out_free; | |
3489 | ||
3490 | out_reg: | |
3491 | /* Don't let event modules unload while probe registered */ | |
1d18538e | 3492 | ret = trace_event_try_get_ref(file->event_call); |
6ed01066 MH |
3493 | if (!ret) { |
3494 | ret = -EBUSY; | |
3cd715de | 3495 | goto out_free; |
6ed01066 | 3496 | } |
3cd715de SRRH |
3497 | |
3498 | ret = __ftrace_event_enable_disable(file, 1, 1); | |
3499 | if (ret < 0) | |
3500 | goto out_put; | |
41794f19 | 3501 | |
04ec7bb6 | 3502 | ret = register_ftrace_function_probe(glob, tr, ops, data); |
ff305ded SRRH |
3503 | /* |
3504 | * The above returns on success the # of functions enabled, | |
3505 | * but if it didn't find any functions it returns zero. | |
3506 | * Consider no functions a failure too. | |
3507 | */ | |
a5b85bd1 MH |
3508 | if (!ret) { |
3509 | ret = -ENOENT; | |
3cd715de | 3510 | goto out_disable; |
ff305ded SRRH |
3511 | } else if (ret < 0) |
3512 | goto out_disable; | |
3513 | /* Just return zero, not the number of enabled functions */ | |
3514 | ret = 0; | |
3cd715de SRRH |
3515 | out: |
3516 | mutex_unlock(&event_mutex); | |
3517 | return ret; | |
3518 | ||
3519 | out_disable: | |
3520 | __ftrace_event_enable_disable(file, 0, 1); | |
3521 | out_put: | |
1d18538e | 3522 | trace_event_put_ref(file->event_call); |
3cd715de SRRH |
3523 | out_free: |
3524 | kfree(data); | |
3525 | goto out; | |
3526 | } | |
3527 | ||
3528 | static struct ftrace_func_command event_enable_cmd = { | |
3529 | .name = ENABLE_EVENT_STR, | |
3530 | .func = event_enable_func, | |
3531 | }; | |
3532 | ||
3533 | static struct ftrace_func_command event_disable_cmd = { | |
3534 | .name = DISABLE_EVENT_STR, | |
3535 | .func = event_enable_func, | |
3536 | }; | |
3537 | ||
3538 | static __init int register_event_cmds(void) | |
3539 | { | |
3540 | int ret; | |
3541 | ||
3542 | ret = register_ftrace_command(&event_enable_cmd); | |
3543 | if (WARN_ON(ret < 0)) | |
3544 | return ret; | |
3545 | ret = register_ftrace_command(&event_disable_cmd); | |
3546 | if (WARN_ON(ret < 0)) | |
3547 | unregister_ftrace_command(&event_enable_cmd); | |
3548 | return ret; | |
3549 | } | |
3550 | #else | |
3551 | static inline int register_event_cmds(void) { return 0; } | |
3552 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
3553 | ||
77248221 | 3554 | /* |
720dee53 MH |
3555 | * The top level array and trace arrays created by boot-time tracing |
3556 | * have already had its trace_event_file descriptors created in order | |
3557 | * to allow for early events to be recorded. | |
3558 | * This function is called after the tracefs has been initialized, | |
3559 | * and we now have to create the files associated to the events. | |
77248221 | 3560 | */ |
720dee53 | 3561 | static void __trace_early_add_event_dirs(struct trace_array *tr) |
77248221 | 3562 | { |
7f1d2f82 | 3563 | struct trace_event_file *file; |
77248221 SR |
3564 | int ret; |
3565 | ||
3566 | ||
3567 | list_for_each_entry(file, &tr->events, list) { | |
620a30e9 | 3568 | ret = event_create_dir(tr->event_dir, file); |
77248221 | 3569 | if (ret < 0) |
3448bac3 | 3570 | pr_warn("Could not create directory for event %s\n", |
687fcc4a | 3571 | trace_event_name(file->event_call)); |
77248221 SR |
3572 | } |
3573 | } | |
3574 | ||
3575 | /* | |
720dee53 MH |
3576 | * For early boot up, the top trace array and the trace arrays created |
3577 | * by boot-time tracing require to have a list of events that can be | |
3578 | * enabled. This must be done before the filesystem is set up in order | |
3579 | * to allow events to be traced early. | |
77248221 | 3580 | */ |
720dee53 | 3581 | void __trace_early_add_events(struct trace_array *tr) |
77248221 | 3582 | { |
2425bcb9 | 3583 | struct trace_event_call *call; |
77248221 SR |
3584 | int ret; |
3585 | ||
3586 | list_for_each_entry(call, &ftrace_events, list) { | |
3587 | /* Early boot up should not have any modules loaded */ | |
1d18538e SRV |
3588 | if (!(call->flags & TRACE_EVENT_FL_DYNAMIC) && |
3589 | WARN_ON_ONCE(call->module)) | |
77248221 SR |
3590 | continue; |
3591 | ||
3592 | ret = __trace_early_add_new_event(call, tr); | |
3593 | if (ret < 0) | |
3448bac3 | 3594 | pr_warn("Could not create early event %s\n", |
687fcc4a | 3595 | trace_event_name(call)); |
77248221 SR |
3596 | } |
3597 | } | |
3598 | ||
0c8916c3 SR |
3599 | /* Remove the event directory structure for a trace directory. */ |
3600 | static void | |
3601 | __trace_remove_event_dirs(struct trace_array *tr) | |
3602 | { | |
7f1d2f82 | 3603 | struct trace_event_file *file, *next; |
0c8916c3 | 3604 | |
f6a84bdc ON |
3605 | list_for_each_entry_safe(file, next, &tr->events, list) |
3606 | remove_event_file_dir(file); | |
0c8916c3 SR |
3607 | } |
3608 | ||
2425bcb9 | 3609 | static void __add_event_to_tracers(struct trace_event_call *call) |
ae63b31e SR |
3610 | { |
3611 | struct trace_array *tr; | |
3612 | ||
620a30e9 ON |
3613 | list_for_each_entry(tr, &ftrace_trace_arrays, list) |
3614 | __trace_add_new_event(call, tr); | |
ae63b31e SR |
3615 | } |
3616 | ||
2425bcb9 SRRH |
3617 | extern struct trace_event_call *__start_ftrace_events[]; |
3618 | extern struct trace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 3619 | |
020e5f85 LZ |
3620 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
3621 | ||
3622 | static __init int setup_trace_event(char *str) | |
3623 | { | |
3624 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
55034cd6 | 3625 | ring_buffer_expanded = true; |
60efe21e | 3626 | disable_tracing_selftest("running event tracing"); |
020e5f85 LZ |
3627 | |
3628 | return 1; | |
3629 | } | |
3630 | __setup("trace_event=", setup_trace_event); | |
3631 | ||
77248221 SR |
3632 | /* Expects to have event_mutex held when called */ |
3633 | static int | |
3634 | create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) | |
ae63b31e SR |
3635 | { |
3636 | struct dentry *d_events; | |
3637 | struct dentry *entry; | |
3638 | ||
e4931b82 YW |
3639 | entry = trace_create_file("set_event", TRACE_MODE_WRITE, parent, |
3640 | tr, &ftrace_set_event_fops); | |
3641 | if (!entry) | |
ae63b31e | 3642 | return -ENOMEM; |
ae63b31e | 3643 | |
8434dc93 | 3644 | d_events = tracefs_create_dir("events", parent); |
277ba044 | 3645 | if (!d_events) { |
8434dc93 | 3646 | pr_warn("Could not create tracefs 'events' directory\n"); |
277ba044 SR |
3647 | return -ENOMEM; |
3648 | } | |
ae63b31e | 3649 | |
21ccc9cd | 3650 | entry = trace_create_file("enable", TRACE_MODE_WRITE, d_events, |
7d436400 | 3651 | tr, &ftrace_tr_enable_fops); |
6e1b4bd1 | 3652 | if (!entry) |
7d436400 | 3653 | return -ENOMEM; |
7d436400 SRRH |
3654 | |
3655 | /* There are not as crucial, just warn if they are not created */ | |
3656 | ||
e4931b82 YW |
3657 | trace_create_file("set_event_pid", TRACE_MODE_WRITE, parent, |
3658 | tr, &ftrace_set_event_pid_fops); | |
49090107 | 3659 | |
e4931b82 YW |
3660 | trace_create_file("set_event_notrace_pid", |
3661 | TRACE_MODE_WRITE, parent, tr, | |
3662 | &ftrace_set_event_notrace_pid_fops); | |
27683626 | 3663 | |
ae63b31e | 3664 | /* ring buffer internal formats */ |
6e1b4bd1 | 3665 | trace_create_file("header_page", TRACE_MODE_READ, d_events, |
7d436400 SRRH |
3666 | ring_buffer_print_page_header, |
3667 | &ftrace_show_header_fops); | |
7d436400 | 3668 | |
6e1b4bd1 | 3669 | trace_create_file("header_event", TRACE_MODE_READ, d_events, |
7d436400 SRRH |
3670 | ring_buffer_print_entry_header, |
3671 | &ftrace_show_header_fops); | |
ae63b31e SR |
3672 | |
3673 | tr->event_dir = d_events; | |
77248221 SR |
3674 | |
3675 | return 0; | |
3676 | } | |
3677 | ||
3678 | /** | |
3679 | * event_trace_add_tracer - add a instance of a trace_array to events | |
3680 | * @parent: The parent dentry to place the files/directories for events in | |
3681 | * @tr: The trace array associated with these events | |
3682 | * | |
3683 | * When a new instance is created, it needs to set up its events | |
3684 | * directory, as well as other files associated with events. It also | |
2b5894cc | 3685 | * creates the event hierarchy in the @parent/events directory. |
77248221 SR |
3686 | * |
3687 | * Returns 0 on success. | |
12ecef0c SRV |
3688 | * |
3689 | * Must be called with event_mutex held. | |
77248221 SR |
3690 | */ |
3691 | int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) | |
3692 | { | |
3693 | int ret; | |
3694 | ||
12ecef0c | 3695 | lockdep_assert_held(&event_mutex); |
77248221 SR |
3696 | |
3697 | ret = create_event_toplevel_files(parent, tr); | |
3698 | if (ret) | |
12ecef0c | 3699 | goto out; |
77248221 | 3700 | |
52f6ad6d | 3701 | down_write(&trace_event_sem); |
720dee53 MH |
3702 | /* If tr already has the event list, it is initialized in early boot. */ |
3703 | if (unlikely(!list_empty(&tr->events))) | |
3704 | __trace_early_add_event_dirs(tr); | |
3705 | else | |
3706 | __trace_add_event_dirs(tr); | |
52f6ad6d | 3707 | up_write(&trace_event_sem); |
277ba044 | 3708 | |
12ecef0c | 3709 | out: |
77248221 SR |
3710 | return ret; |
3711 | } | |
3712 | ||
3713 | /* | |
3714 | * The top trace array already had its file descriptors created. | |
3715 | * Now the files themselves need to be created. | |
3716 | */ | |
3717 | static __init int | |
3718 | early_event_add_tracer(struct dentry *parent, struct trace_array *tr) | |
3719 | { | |
3720 | int ret; | |
3721 | ||
3722 | mutex_lock(&event_mutex); | |
3723 | ||
3724 | ret = create_event_toplevel_files(parent, tr); | |
3725 | if (ret) | |
3726 | goto out_unlock; | |
3727 | ||
52f6ad6d | 3728 | down_write(&trace_event_sem); |
77248221 | 3729 | __trace_early_add_event_dirs(tr); |
52f6ad6d | 3730 | up_write(&trace_event_sem); |
77248221 SR |
3731 | |
3732 | out_unlock: | |
3733 | mutex_unlock(&event_mutex); | |
3734 | ||
3735 | return ret; | |
ae63b31e SR |
3736 | } |
3737 | ||
12ecef0c | 3738 | /* Must be called with event_mutex held */ |
0c8916c3 SR |
3739 | int event_trace_del_tracer(struct trace_array *tr) |
3740 | { | |
12ecef0c | 3741 | lockdep_assert_held(&event_mutex); |
0c8916c3 | 3742 | |
85f2b082 TZ |
3743 | /* Disable any event triggers and associated soft-disabled events */ |
3744 | clear_event_triggers(tr); | |
3745 | ||
49090107 | 3746 | /* Clear the pid list */ |
27683626 | 3747 | __ftrace_clear_event_pids(tr, TRACE_PIDS | TRACE_NO_PIDS); |
49090107 | 3748 | |
2a6c24af SRRH |
3749 | /* Disable any running events */ |
3750 | __ftrace_set_clr_event_nolock(tr, NULL, NULL, NULL, 0); | |
3751 | ||
e0a568dc SRV |
3752 | /* Make sure no more events are being executed */ |
3753 | tracepoint_synchronize_unregister(); | |
3ccb0123 | 3754 | |
52f6ad6d | 3755 | down_write(&trace_event_sem); |
0c8916c3 | 3756 | __trace_remove_event_dirs(tr); |
a3d1e7eb | 3757 | tracefs_remove(tr->event_dir); |
52f6ad6d | 3758 | up_write(&trace_event_sem); |
0c8916c3 SR |
3759 | |
3760 | tr->event_dir = NULL; | |
3761 | ||
0c8916c3 SR |
3762 | return 0; |
3763 | } | |
3764 | ||
d1a29143 SR |
3765 | static __init int event_trace_memsetup(void) |
3766 | { | |
3767 | field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); | |
7f1d2f82 | 3768 | file_cachep = KMEM_CACHE(trace_event_file, SLAB_PANIC); |
d1a29143 SR |
3769 | return 0; |
3770 | } | |
3771 | ||
c4846480 SRG |
3772 | __init void |
3773 | early_enable_events(struct trace_array *tr, char *buf, bool disable_first) | |
ce1039bd | 3774 | { |
ce1039bd SRRH |
3775 | char *token; |
3776 | int ret; | |
3777 | ||
3778 | while (true) { | |
3779 | token = strsep(&buf, ","); | |
3780 | ||
3781 | if (!token) | |
3782 | break; | |
ce1039bd | 3783 | |
43ed3843 SRRH |
3784 | if (*token) { |
3785 | /* Restarting syscalls requires that we stop them first */ | |
3786 | if (disable_first) | |
3787 | ftrace_set_clr_event(tr, token, 0); | |
ce1039bd | 3788 | |
43ed3843 SRRH |
3789 | ret = ftrace_set_clr_event(tr, token, 1); |
3790 | if (ret) | |
3791 | pr_warn("Failed to enable trace event: %s\n", token); | |
3792 | } | |
ce1039bd SRRH |
3793 | |
3794 | /* Put back the comma to allow this to be called again */ | |
3795 | if (buf) | |
3796 | *(buf - 1) = ','; | |
3797 | } | |
3798 | } | |
3799 | ||
8781915a EG |
3800 | static __init int event_trace_enable(void) |
3801 | { | |
ae63b31e | 3802 | struct trace_array *tr = top_trace_array(); |
2425bcb9 | 3803 | struct trace_event_call **iter, *call; |
8781915a EG |
3804 | int ret; |
3805 | ||
dc81e5e3 YY |
3806 | if (!tr) |
3807 | return -ENODEV; | |
3808 | ||
8781915a EG |
3809 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { |
3810 | ||
3811 | call = *iter; | |
3812 | ret = event_init(call); | |
3813 | if (!ret) | |
3814 | list_add(&call->list, &ftrace_events); | |
3815 | } | |
3816 | ||
a01fdc89 SRG |
3817 | register_trigger_cmds(); |
3818 | ||
77248221 SR |
3819 | /* |
3820 | * We need the top trace array to have a working set of trace | |
3821 | * points at early init, before the debug files and directories | |
3822 | * are created. Create the file entries now, and attach them | |
3823 | * to the actual file dentries later. | |
3824 | */ | |
3825 | __trace_early_add_events(tr); | |
3826 | ||
c4846480 | 3827 | early_enable_events(tr, bootup_event_buf, false); |
81698831 SR |
3828 | |
3829 | trace_printk_start_comm(); | |
3830 | ||
3cd715de SRRH |
3831 | register_event_cmds(); |
3832 | ||
85f2b082 | 3833 | |
8781915a EG |
3834 | return 0; |
3835 | } | |
3836 | ||
ce1039bd SRRH |
3837 | /* |
3838 | * event_trace_enable() is called from trace_event_init() first to | |
3839 | * initialize events and perhaps start any events that are on the | |
3840 | * command line. Unfortunately, there are some events that will not | |
3841 | * start this early, like the system call tracepoints that need | |
524666cb GKB |
3842 | * to set the %SYSCALL_WORK_SYSCALL_TRACEPOINT flag of pid 1. But |
3843 | * event_trace_enable() is called before pid 1 starts, and this flag | |
3844 | * is never set, making the syscall tracepoint never get reached, but | |
3845 | * the event is enabled regardless (and not doing anything). | |
ce1039bd SRRH |
3846 | */ |
3847 | static __init int event_trace_enable_again(void) | |
3848 | { | |
3849 | struct trace_array *tr; | |
3850 | ||
3851 | tr = top_trace_array(); | |
3852 | if (!tr) | |
3853 | return -ENODEV; | |
3854 | ||
c4846480 | 3855 | early_enable_events(tr, bootup_event_buf, true); |
ce1039bd SRRH |
3856 | |
3857 | return 0; | |
3858 | } | |
3859 | ||
3860 | early_initcall(event_trace_enable_again); | |
3861 | ||
ac343da7 MH |
3862 | /* Init fields which doesn't related to the tracefs */ |
3863 | static __init int event_trace_init_fields(void) | |
3864 | { | |
3865 | if (trace_define_generic_fields()) | |
3866 | pr_warn("tracing: Failed to allocated generic fields"); | |
3867 | ||
3868 | if (trace_define_common_fields()) | |
3869 | pr_warn("tracing: Failed to allocate common fields"); | |
3870 | ||
3871 | return 0; | |
3872 | } | |
3873 | ||
58b92547 | 3874 | __init int event_trace_init(void) |
b77e38aa | 3875 | { |
ae63b31e | 3876 | struct trace_array *tr; |
6d723736 | 3877 | int ret; |
b77e38aa | 3878 | |
ae63b31e | 3879 | tr = top_trace_array(); |
dc81e5e3 YY |
3880 | if (!tr) |
3881 | return -ENODEV; | |
ae63b31e | 3882 | |
e4931b82 YW |
3883 | trace_create_file("available_events", TRACE_MODE_READ, |
3884 | NULL, tr, &ftrace_avail_fops); | |
2314c4ae | 3885 | |
dc300d77 | 3886 | ret = early_event_add_tracer(NULL, tr); |
ae63b31e SR |
3887 | if (ret) |
3888 | return ret; | |
020e5f85 | 3889 | |
836d481e | 3890 | #ifdef CONFIG_MODULES |
6d723736 | 3891 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 3892 | if (ret) |
3448bac3 | 3893 | pr_warn("Failed to register trace events module notifier\n"); |
836d481e | 3894 | #endif |
a838deab MH |
3895 | |
3896 | eventdir_initialized = true; | |
3897 | ||
b77e38aa SR |
3898 | return 0; |
3899 | } | |
5f893b26 SRRH |
3900 | |
3901 | void __init trace_event_init(void) | |
3902 | { | |
3903 | event_trace_memsetup(); | |
3904 | init_ftrace_syscalls(); | |
3905 | event_trace_enable(); | |
ac343da7 | 3906 | event_trace_init_fields(); |
5f893b26 SRRH |
3907 | } |
3908 | ||
b3015fe4 | 3909 | #ifdef CONFIG_EVENT_TRACE_STARTUP_TEST |
e6187007 SR |
3910 | |
3911 | static DEFINE_SPINLOCK(test_spinlock); | |
3912 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
3913 | static DEFINE_MUTEX(test_mutex); | |
3914 | ||
3915 | static __init void test_work(struct work_struct *dummy) | |
3916 | { | |
3917 | spin_lock(&test_spinlock); | |
3918 | spin_lock_irq(&test_spinlock_irq); | |
3919 | udelay(1); | |
3920 | spin_unlock_irq(&test_spinlock_irq); | |
3921 | spin_unlock(&test_spinlock); | |
3922 | ||
3923 | mutex_lock(&test_mutex); | |
3924 | msleep(1); | |
3925 | mutex_unlock(&test_mutex); | |
3926 | } | |
3927 | ||
3928 | static __init int event_test_thread(void *unused) | |
3929 | { | |
3930 | void *test_malloc; | |
3931 | ||
3932 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
3933 | if (!test_malloc) | |
3934 | pr_info("failed to kmalloc\n"); | |
3935 | ||
3936 | schedule_on_each_cpu(test_work); | |
3937 | ||
3938 | kfree(test_malloc); | |
3939 | ||
3940 | set_current_state(TASK_INTERRUPTIBLE); | |
fe0e01c7 | 3941 | while (!kthread_should_stop()) { |
e6187007 | 3942 | schedule(); |
fe0e01c7 PZ |
3943 | set_current_state(TASK_INTERRUPTIBLE); |
3944 | } | |
3945 | __set_current_state(TASK_RUNNING); | |
e6187007 SR |
3946 | |
3947 | return 0; | |
3948 | } | |
3949 | ||
3950 | /* | |
3951 | * Do various things that may trigger events. | |
3952 | */ | |
3953 | static __init void event_test_stuff(void) | |
3954 | { | |
3955 | struct task_struct *test_thread; | |
3956 | ||
3957 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
3958 | msleep(1); | |
3959 | kthread_stop(test_thread); | |
3960 | } | |
3961 | ||
3962 | /* | |
3963 | * For every trace event defined, we will test each trace point separately, | |
3964 | * and then by groups, and finally all trace points. | |
3965 | */ | |
9ea21c1e | 3966 | static __init void event_trace_self_tests(void) |
e6187007 | 3967 | { |
7967b3e0 | 3968 | struct trace_subsystem_dir *dir; |
7f1d2f82 | 3969 | struct trace_event_file *file; |
2425bcb9 | 3970 | struct trace_event_call *call; |
e6187007 | 3971 | struct event_subsystem *system; |
ae63b31e | 3972 | struct trace_array *tr; |
e6187007 SR |
3973 | int ret; |
3974 | ||
ae63b31e | 3975 | tr = top_trace_array(); |
dc81e5e3 YY |
3976 | if (!tr) |
3977 | return; | |
ae63b31e | 3978 | |
e6187007 SR |
3979 | pr_info("Running tests on trace events:\n"); |
3980 | ||
ae63b31e SR |
3981 | list_for_each_entry(file, &tr->events, list) { |
3982 | ||
3983 | call = file->event_call; | |
e6187007 | 3984 | |
2239291a SR |
3985 | /* Only test those that have a probe */ |
3986 | if (!call->class || !call->class->probe) | |
e6187007 SR |
3987 | continue; |
3988 | ||
1f5a6b45 SR |
3989 | /* |
3990 | * Testing syscall events here is pretty useless, but | |
3991 | * we still do it if configured. But this is time consuming. | |
3992 | * What we really need is a user thread to perform the | |
3993 | * syscalls as we test. | |
3994 | */ | |
3995 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
3996 | if (call->class->system && |
3997 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
3998 | continue; |
3999 | #endif | |
4000 | ||
687fcc4a | 4001 | pr_info("Testing event %s: ", trace_event_name(call)); |
e6187007 SR |
4002 | |
4003 | /* | |
4004 | * If an event is already enabled, someone is using | |
4005 | * it and the self test should not be on. | |
4006 | */ | |
5d6ad960 | 4007 | if (file->flags & EVENT_FILE_FL_ENABLED) { |
3448bac3 | 4008 | pr_warn("Enabled event during self test!\n"); |
e6187007 SR |
4009 | WARN_ON_ONCE(1); |
4010 | continue; | |
4011 | } | |
4012 | ||
ae63b31e | 4013 | ftrace_event_enable_disable(file, 1); |
e6187007 | 4014 | event_test_stuff(); |
ae63b31e | 4015 | ftrace_event_enable_disable(file, 0); |
e6187007 SR |
4016 | |
4017 | pr_cont("OK\n"); | |
4018 | } | |
4019 | ||
4020 | /* Now test at the sub system level */ | |
4021 | ||
4022 | pr_info("Running tests on trace event systems:\n"); | |
4023 | ||
ae63b31e SR |
4024 | list_for_each_entry(dir, &tr->systems, list) { |
4025 | ||
4026 | system = dir->subsystem; | |
e6187007 SR |
4027 | |
4028 | /* the ftrace system is special, skip it */ | |
4029 | if (strcmp(system->name, "ftrace") == 0) | |
4030 | continue; | |
4031 | ||
4032 | pr_info("Testing event system %s: ", system->name); | |
4033 | ||
ae63b31e | 4034 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
e6187007 | 4035 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
4036 | pr_warn("error enabling system %s\n", |
4037 | system->name); | |
e6187007 SR |
4038 | continue; |
4039 | } | |
4040 | ||
4041 | event_test_stuff(); | |
4042 | ||
ae63b31e | 4043 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
76bab1b7 | 4044 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
4045 | pr_warn("error disabling system %s\n", |
4046 | system->name); | |
76bab1b7 YL |
4047 | continue; |
4048 | } | |
e6187007 SR |
4049 | |
4050 | pr_cont("OK\n"); | |
4051 | } | |
4052 | ||
4053 | /* Test with all events enabled */ | |
4054 | ||
4055 | pr_info("Running tests on all trace events:\n"); | |
4056 | pr_info("Testing all events: "); | |
4057 | ||
ae63b31e | 4058 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
e6187007 | 4059 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 4060 | pr_warn("error enabling all events\n"); |
9ea21c1e | 4061 | return; |
e6187007 SR |
4062 | } |
4063 | ||
4064 | event_test_stuff(); | |
4065 | ||
4066 | /* reset sysname */ | |
ae63b31e | 4067 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
e6187007 | 4068 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 4069 | pr_warn("error disabling all events\n"); |
9ea21c1e | 4070 | return; |
e6187007 SR |
4071 | } |
4072 | ||
4073 | pr_cont("OK\n"); | |
9ea21c1e SR |
4074 | } |
4075 | ||
4076 | #ifdef CONFIG_FUNCTION_TRACER | |
4077 | ||
245b2e70 | 4078 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e | 4079 | |
9b9db275 | 4080 | static struct trace_event_file event_trace_file __initdata; |
b7f0c959 SRRH |
4081 | |
4082 | static void __init | |
2f5f6ad9 | 4083 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
d19ad077 | 4084 | struct ftrace_ops *op, struct ftrace_regs *regs) |
9ea21c1e | 4085 | { |
13292494 | 4086 | struct trace_buffer *buffer; |
9ea21c1e SR |
4087 | struct ring_buffer_event *event; |
4088 | struct ftrace_entry *entry; | |
36590c50 | 4089 | unsigned int trace_ctx; |
9ea21c1e | 4090 | long disabled; |
9ea21c1e | 4091 | int cpu; |
9ea21c1e | 4092 | |
36590c50 | 4093 | trace_ctx = tracing_gen_ctx(); |
5168ae50 | 4094 | preempt_disable_notrace(); |
9ea21c1e | 4095 | cpu = raw_smp_processor_id(); |
245b2e70 | 4096 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
4097 | |
4098 | if (disabled != 1) | |
4099 | goto out; | |
4100 | ||
9b9db275 SRRH |
4101 | event = trace_event_buffer_lock_reserve(&buffer, &event_trace_file, |
4102 | TRACE_FN, sizeof(*entry), | |
36590c50 | 4103 | trace_ctx); |
9ea21c1e SR |
4104 | if (!event) |
4105 | goto out; | |
4106 | entry = ring_buffer_event_data(event); | |
4107 | entry->ip = ip; | |
4108 | entry->parent_ip = parent_ip; | |
4109 | ||
9b9db275 | 4110 | event_trigger_unlock_commit(&event_trace_file, buffer, event, |
36590c50 | 4111 | entry, trace_ctx); |
9ea21c1e | 4112 | out: |
245b2e70 | 4113 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 4114 | preempt_enable_notrace(); |
9ea21c1e SR |
4115 | } |
4116 | ||
4117 | static struct ftrace_ops trace_ops __initdata = | |
4118 | { | |
4119 | .func = function_test_events_call, | |
4120 | }; | |
4121 | ||
4122 | static __init void event_trace_self_test_with_function(void) | |
4123 | { | |
17bb615a | 4124 | int ret; |
9b9db275 SRRH |
4125 | |
4126 | event_trace_file.tr = top_trace_array(); | |
4127 | if (WARN_ON(!event_trace_file.tr)) | |
2d34f489 | 4128 | return; |
9b9db275 | 4129 | |
17bb615a SR |
4130 | ret = register_ftrace_function(&trace_ops); |
4131 | if (WARN_ON(ret < 0)) { | |
4132 | pr_info("Failed to enable function tracer for event tests\n"); | |
4133 | return; | |
4134 | } | |
9ea21c1e SR |
4135 | pr_info("Running tests again, along with the function tracer\n"); |
4136 | event_trace_self_tests(); | |
4137 | unregister_ftrace_function(&trace_ops); | |
4138 | } | |
4139 | #else | |
4140 | static __init void event_trace_self_test_with_function(void) | |
4141 | { | |
4142 | } | |
4143 | #endif | |
4144 | ||
4145 | static __init int event_trace_self_tests_init(void) | |
4146 | { | |
020e5f85 LZ |
4147 | if (!tracing_selftest_disabled) { |
4148 | event_trace_self_tests(); | |
4149 | event_trace_self_test_with_function(); | |
4150 | } | |
e6187007 SR |
4151 | |
4152 | return 0; | |
4153 | } | |
4154 | ||
28d20e2d | 4155 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
4156 | |
4157 | #endif |