]>
Commit | Line | Data |
---|---|---|
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); | |
4b512860 SRG |
197 | __generic_field(char *, stacktrace, FILTER_STACKTRACE); |
198 | __generic_field(char *, STACKTRACE, FILTER_STACKTRACE); | |
9f616680 DW |
199 | |
200 | return ret; | |
201 | } | |
202 | ||
8728fe50 | 203 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
204 | { |
205 | int ret; | |
206 | struct trace_entry ent; | |
207 | ||
208 | __common_field(unsigned short, type); | |
209 | __common_field(unsigned char, flags); | |
54357f0c | 210 | /* Holds both preempt_count and migrate_disable */ |
e647d6b3 LZ |
211 | __common_field(unsigned char, preempt_count); |
212 | __common_field(int, pid); | |
e647d6b3 LZ |
213 | |
214 | return ret; | |
215 | } | |
216 | ||
2425bcb9 | 217 | static void trace_destroy_fields(struct trace_event_call *call) |
2df75e41 LZ |
218 | { |
219 | struct ftrace_event_field *field, *next; | |
2e33af02 | 220 | struct list_head *head; |
2df75e41 | 221 | |
2e33af02 SR |
222 | head = trace_get_fields(call); |
223 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 | 224 | list_del(&field->link); |
d1a29143 | 225 | kmem_cache_free(field_cachep, field); |
2df75e41 LZ |
226 | } |
227 | } | |
228 | ||
32bbe007 AS |
229 | /* |
230 | * run-time version of trace_event_get_offsets_<call>() that returns the last | |
231 | * accessible offset of trace fields excluding __dynamic_array bytes | |
232 | */ | |
233 | int trace_event_get_offsets(struct trace_event_call *call) | |
234 | { | |
235 | struct ftrace_event_field *tail; | |
236 | struct list_head *head; | |
237 | ||
238 | head = trace_get_fields(call); | |
239 | /* | |
240 | * head->next points to the last field with the largest offset, | |
241 | * since it was added last by trace_define_field() | |
242 | */ | |
243 | tail = list_first_entry(head, struct ftrace_event_field, link); | |
244 | return tail->offset + tail->size; | |
245 | } | |
246 | ||
5013f454 SRV |
247 | /* |
248 | * Check if the referenced field is an array and return true, | |
249 | * as arrays are OK to dereference. | |
250 | */ | |
251 | static bool test_field(const char *fmt, struct trace_event_call *call) | |
252 | { | |
253 | struct trace_event_fields *field = call->class->fields_array; | |
254 | const char *array_descriptor; | |
255 | const char *p = fmt; | |
256 | int len; | |
257 | ||
258 | if (!(len = str_has_prefix(fmt, "REC->"))) | |
259 | return false; | |
260 | fmt += len; | |
261 | for (p = fmt; *p; p++) { | |
262 | if (!isalnum(*p) && *p != '_') | |
263 | break; | |
264 | } | |
265 | len = p - fmt; | |
266 | ||
267 | for (; field->type; field++) { | |
268 | if (strncmp(field->name, fmt, len) || | |
269 | field->name[len]) | |
270 | continue; | |
271 | array_descriptor = strchr(field->type, '['); | |
272 | /* This is an array and is OK to dereference. */ | |
273 | return array_descriptor != NULL; | |
274 | } | |
275 | return false; | |
276 | } | |
277 | ||
278 | /* | |
279 | * Examine the print fmt of the event looking for unsafe dereference | |
280 | * pointers using %p* that could be recorded in the trace event and | |
281 | * much later referenced after the pointer was freed. Dereferencing | |
282 | * pointers are OK, if it is dereferenced into the event itself. | |
283 | */ | |
284 | static void test_event_printk(struct trace_event_call *call) | |
285 | { | |
286 | u64 dereference_flags = 0; | |
287 | bool first = true; | |
288 | const char *fmt, *c, *r, *a; | |
289 | int parens = 0; | |
290 | char in_quote = 0; | |
291 | int start_arg = 0; | |
292 | int arg = 0; | |
293 | int i; | |
294 | ||
295 | fmt = call->print_fmt; | |
296 | ||
297 | if (!fmt) | |
298 | return; | |
299 | ||
300 | for (i = 0; fmt[i]; i++) { | |
301 | switch (fmt[i]) { | |
302 | case '\\': | |
303 | i++; | |
304 | if (!fmt[i]) | |
305 | return; | |
306 | continue; | |
307 | case '"': | |
308 | case '\'': | |
309 | /* | |
310 | * The print fmt starts with a string that | |
311 | * is processed first to find %p* usage, | |
312 | * then after the first string, the print fmt | |
313 | * contains arguments that are used to check | |
314 | * if the dereferenced %p* usage is safe. | |
315 | */ | |
316 | if (first) { | |
317 | if (fmt[i] == '\'') | |
318 | continue; | |
319 | if (in_quote) { | |
320 | arg = 0; | |
321 | first = false; | |
322 | /* | |
323 | * If there was no %p* uses | |
324 | * the fmt is OK. | |
325 | */ | |
326 | if (!dereference_flags) | |
327 | return; | |
328 | } | |
329 | } | |
330 | if (in_quote) { | |
331 | if (in_quote == fmt[i]) | |
332 | in_quote = 0; | |
333 | } else { | |
334 | in_quote = fmt[i]; | |
335 | } | |
336 | continue; | |
337 | case '%': | |
338 | if (!first || !in_quote) | |
339 | continue; | |
340 | i++; | |
341 | if (!fmt[i]) | |
342 | return; | |
343 | switch (fmt[i]) { | |
344 | case '%': | |
345 | continue; | |
346 | case 'p': | |
347 | /* Find dereferencing fields */ | |
348 | switch (fmt[i + 1]) { | |
349 | case 'B': case 'R': case 'r': | |
350 | case 'b': case 'M': case 'm': | |
351 | case 'I': case 'i': case 'E': | |
352 | case 'U': case 'V': case 'N': | |
353 | case 'a': case 'd': case 'D': | |
354 | case 'g': case 't': case 'C': | |
355 | case 'O': case 'f': | |
356 | if (WARN_ONCE(arg == 63, | |
357 | "Too many args for event: %s", | |
358 | trace_event_name(call))) | |
359 | return; | |
360 | dereference_flags |= 1ULL << arg; | |
361 | } | |
362 | break; | |
363 | default: | |
364 | { | |
365 | bool star = false; | |
366 | int j; | |
367 | ||
368 | /* Increment arg if %*s exists. */ | |
369 | for (j = 0; fmt[i + j]; j++) { | |
370 | if (isdigit(fmt[i + j]) || | |
371 | fmt[i + j] == '.') | |
372 | continue; | |
373 | if (fmt[i + j] == '*') { | |
374 | star = true; | |
375 | continue; | |
376 | } | |
377 | if ((fmt[i + j] == 's') && star) | |
378 | arg++; | |
379 | break; | |
380 | } | |
381 | break; | |
382 | } /* default */ | |
383 | ||
384 | } /* switch */ | |
385 | arg++; | |
386 | continue; | |
387 | case '(': | |
388 | if (in_quote) | |
389 | continue; | |
390 | parens++; | |
391 | continue; | |
392 | case ')': | |
393 | if (in_quote) | |
394 | continue; | |
395 | parens--; | |
396 | if (WARN_ONCE(parens < 0, | |
397 | "Paren mismatch for event: %s\narg='%s'\n%*s", | |
398 | trace_event_name(call), | |
399 | fmt + start_arg, | |
400 | (i - start_arg) + 5, "^")) | |
401 | return; | |
402 | continue; | |
403 | case ',': | |
404 | if (in_quote || parens) | |
405 | continue; | |
406 | i++; | |
407 | while (isspace(fmt[i])) | |
408 | i++; | |
409 | start_arg = i; | |
410 | if (!(dereference_flags & (1ULL << arg))) | |
411 | goto next_arg; | |
412 | ||
413 | /* Find the REC-> in the argument */ | |
414 | c = strchr(fmt + i, ','); | |
415 | r = strstr(fmt + i, "REC->"); | |
416 | if (r && (!c || r < c)) { | |
417 | /* | |
418 | * Addresses of events on the buffer, | |
419 | * or an array on the buffer is | |
420 | * OK to dereference. | |
421 | * There's ways to fool this, but | |
422 | * this is to catch common mistakes, | |
423 | * not malicious code. | |
424 | */ | |
425 | a = strchr(fmt + i, '&'); | |
426 | if ((a && (a < r)) || test_field(r, call)) | |
427 | dereference_flags &= ~(1ULL << arg); | |
499f1216 SRG |
428 | } else if ((r = strstr(fmt + i, "__get_dynamic_array(")) && |
429 | (!c || r < c)) { | |
430 | dereference_flags &= ~(1ULL << arg); | |
431 | } else if ((r = strstr(fmt + i, "__get_sockaddr(")) && | |
432 | (!c || r < c)) { | |
433 | dereference_flags &= ~(1ULL << arg); | |
5013f454 | 434 | } |
499f1216 | 435 | |
5013f454 SRV |
436 | next_arg: |
437 | i--; | |
438 | arg++; | |
439 | } | |
440 | } | |
441 | ||
442 | /* | |
443 | * If you triggered the below warning, the trace event reported | |
444 | * uses an unsafe dereference pointer %p*. As the data stored | |
445 | * at the trace event time may no longer exist when the trace | |
446 | * event is printed, dereferencing to the original source is | |
447 | * unsafe. The source of the dereference must be copied into the | |
448 | * event itself, and the dereference must access the copy instead. | |
449 | */ | |
450 | if (WARN_ON_ONCE(dereference_flags)) { | |
451 | arg = 1; | |
452 | while (!(dereference_flags & 1)) { | |
453 | dereference_flags >>= 1; | |
454 | arg++; | |
455 | } | |
456 | pr_warn("event %s has unsafe dereference of argument %d\n", | |
457 | trace_event_name(call), arg); | |
458 | pr_warn("print_fmt: %s\n", fmt); | |
459 | } | |
460 | } | |
461 | ||
2425bcb9 | 462 | int trace_event_raw_init(struct trace_event_call *call) |
87d9b4e1 LZ |
463 | { |
464 | int id; | |
465 | ||
9023c930 | 466 | id = register_trace_event(&call->event); |
87d9b4e1 LZ |
467 | if (!id) |
468 | return -ENODEV; | |
87d9b4e1 | 469 | |
5013f454 SRV |
470 | test_event_printk(call); |
471 | ||
87d9b4e1 LZ |
472 | return 0; |
473 | } | |
474 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
475 | ||
3fdaf80f SRRH |
476 | bool trace_event_ignore_this_pid(struct trace_event_file *trace_file) |
477 | { | |
478 | struct trace_array *tr = trace_file->tr; | |
479 | struct trace_array_cpu *data; | |
27683626 | 480 | struct trace_pid_list *no_pid_list; |
3fdaf80f SRRH |
481 | struct trace_pid_list *pid_list; |
482 | ||
da25a672 | 483 | pid_list = rcu_dereference_raw(tr->filtered_pids); |
27683626 SRV |
484 | no_pid_list = rcu_dereference_raw(tr->filtered_no_pids); |
485 | ||
486 | if (!pid_list && !no_pid_list) | |
3fdaf80f SRRH |
487 | return false; |
488 | ||
1c5eb448 | 489 | data = this_cpu_ptr(tr->array_buffer.data); |
3fdaf80f SRRH |
490 | |
491 | return data->ignore_pid; | |
492 | } | |
493 | EXPORT_SYMBOL_GPL(trace_event_ignore_this_pid); | |
494 | ||
3f795dcf SRRH |
495 | void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer, |
496 | struct trace_event_file *trace_file, | |
497 | unsigned long len) | |
3fd40d1e | 498 | { |
2425bcb9 | 499 | struct trace_event_call *event_call = trace_file->event_call; |
3fd40d1e | 500 | |
3fdaf80f SRRH |
501 | if ((trace_file->flags & EVENT_FILE_FL_PID_FILTER) && |
502 | trace_event_ignore_this_pid(trace_file)) | |
503 | return NULL; | |
504 | ||
e947841c | 505 | /* |
30c93704 | 506 | * If CONFIG_PREEMPTION is enabled, then the tracepoint itself disables |
e947841c SRRH |
507 | * preemption (adding one to the preempt_count). Since we are |
508 | * interested in the preempt_count at the time the tracepoint was | |
509 | * hit, we need to subtract one to offset the increment. | |
510 | */ | |
36590c50 | 511 | fbuffer->trace_ctx = tracing_gen_ctx_dec(); |
7f1d2f82 | 512 | fbuffer->trace_file = trace_file; |
3fd40d1e SR |
513 | |
514 | fbuffer->event = | |
7f1d2f82 | 515 | trace_event_buffer_lock_reserve(&fbuffer->buffer, trace_file, |
3fd40d1e | 516 | event_call->event.type, len, |
36590c50 | 517 | fbuffer->trace_ctx); |
3fd40d1e SR |
518 | if (!fbuffer->event) |
519 | return NULL; | |
520 | ||
8cfcf155 | 521 | fbuffer->regs = NULL; |
3fd40d1e SR |
522 | fbuffer->entry = ring_buffer_event_data(fbuffer->event); |
523 | return fbuffer->entry; | |
524 | } | |
3f795dcf | 525 | EXPORT_SYMBOL_GPL(trace_event_buffer_reserve); |
3fd40d1e | 526 | |
2425bcb9 | 527 | int trace_event_reg(struct trace_event_call *call, |
9023c930 | 528 | enum trace_reg type, void *data) |
a1d0ce82 | 529 | { |
7f1d2f82 | 530 | struct trace_event_file *file = data; |
ae63b31e | 531 | |
de7b2973 | 532 | WARN_ON(!(call->flags & TRACE_EVENT_FL_TRACEPOINT)); |
a1d0ce82 SR |
533 | switch (type) { |
534 | case TRACE_REG_REGISTER: | |
de7b2973 | 535 | return tracepoint_probe_register(call->tp, |
a1d0ce82 | 536 | call->class->probe, |
ae63b31e | 537 | file); |
a1d0ce82 | 538 | case TRACE_REG_UNREGISTER: |
de7b2973 | 539 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 | 540 | call->class->probe, |
ae63b31e | 541 | file); |
a1d0ce82 SR |
542 | return 0; |
543 | ||
544 | #ifdef CONFIG_PERF_EVENTS | |
545 | case TRACE_REG_PERF_REGISTER: | |
de7b2973 | 546 | return tracepoint_probe_register(call->tp, |
a1d0ce82 SR |
547 | call->class->perf_probe, |
548 | call); | |
549 | case TRACE_REG_PERF_UNREGISTER: | |
de7b2973 | 550 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 SR |
551 | call->class->perf_probe, |
552 | call); | |
553 | return 0; | |
ceec0b6f JO |
554 | case TRACE_REG_PERF_OPEN: |
555 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
556 | case TRACE_REG_PERF_ADD: |
557 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 558 | return 0; |
a1d0ce82 SR |
559 | #endif |
560 | } | |
561 | return 0; | |
562 | } | |
9023c930 | 563 | EXPORT_SYMBOL_GPL(trace_event_reg); |
a1d0ce82 | 564 | |
e870e9a1 LZ |
565 | void trace_event_enable_cmd_record(bool enable) |
566 | { | |
7f1d2f82 | 567 | struct trace_event_file *file; |
ae63b31e | 568 | struct trace_array *tr; |
e870e9a1 | 569 | |
3a53acf1 PS |
570 | lockdep_assert_held(&event_mutex); |
571 | ||
ae63b31e SR |
572 | do_for_each_event_file(tr, file) { |
573 | ||
5d6ad960 | 574 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) |
e870e9a1 LZ |
575 | continue; |
576 | ||
577 | if (enable) { | |
578 | tracing_start_cmdline_record(); | |
5d6ad960 | 579 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 LZ |
580 | } else { |
581 | tracing_stop_cmdline_record(); | |
5d6ad960 | 582 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 583 | } |
ae63b31e | 584 | } while_for_each_event_file(); |
e870e9a1 LZ |
585 | } |
586 | ||
d914ba37 JF |
587 | void trace_event_enable_tgid_record(bool enable) |
588 | { | |
589 | struct trace_event_file *file; | |
590 | struct trace_array *tr; | |
591 | ||
3a53acf1 PS |
592 | lockdep_assert_held(&event_mutex); |
593 | ||
d914ba37 JF |
594 | do_for_each_event_file(tr, file) { |
595 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) | |
596 | continue; | |
597 | ||
598 | if (enable) { | |
599 | tracing_start_tgid_record(); | |
600 | set_bit(EVENT_FILE_FL_RECORDED_TGID_BIT, &file->flags); | |
601 | } else { | |
602 | tracing_stop_tgid_record(); | |
603 | clear_bit(EVENT_FILE_FL_RECORDED_TGID_BIT, | |
604 | &file->flags); | |
605 | } | |
606 | } while_for_each_event_file(); | |
d914ba37 JF |
607 | } |
608 | ||
7f1d2f82 | 609 | static int __ftrace_event_enable_disable(struct trace_event_file *file, |
417944c4 | 610 | int enable, int soft_disable) |
fd994989 | 611 | { |
2425bcb9 | 612 | struct trace_event_call *call = file->event_call; |
983f938a | 613 | struct trace_array *tr = file->tr; |
3b8e4273 | 614 | int ret = 0; |
417944c4 | 615 | int disable; |
3b8e4273 | 616 | |
fd994989 SR |
617 | switch (enable) { |
618 | case 0: | |
417944c4 | 619 | /* |
1cf4c073 MH |
620 | * When soft_disable is set and enable is cleared, the sm_ref |
621 | * reference counter is decremented. If it reaches 0, we want | |
417944c4 SRRH |
622 | * to clear the SOFT_DISABLED flag but leave the event in the |
623 | * state that it was. That is, if the event was enabled and | |
624 | * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED | |
625 | * is set we do not want the event to be enabled before we | |
626 | * clear the bit. | |
627 | * | |
628 | * When soft_disable is not set but the SOFT_MODE flag is, | |
629 | * we do nothing. Do not disable the tracepoint, otherwise | |
630 | * "soft enable"s (clearing the SOFT_DISABLED bit) wont work. | |
631 | */ | |
632 | if (soft_disable) { | |
1cf4c073 MH |
633 | if (atomic_dec_return(&file->sm_ref) > 0) |
634 | break; | |
5d6ad960 SRRH |
635 | disable = file->flags & EVENT_FILE_FL_SOFT_DISABLED; |
636 | clear_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); | |
dea49978 ZY |
637 | /* Disable use of trace_buffered_event */ |
638 | trace_buffered_event_disable(); | |
417944c4 | 639 | } else |
5d6ad960 | 640 | disable = !(file->flags & EVENT_FILE_FL_SOFT_MODE); |
417944c4 | 641 | |
5d6ad960 SRRH |
642 | if (disable && (file->flags & EVENT_FILE_FL_ENABLED)) { |
643 | clear_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); | |
644 | if (file->flags & EVENT_FILE_FL_RECORDED_CMD) { | |
e870e9a1 | 645 | tracing_stop_cmdline_record(); |
5d6ad960 | 646 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 647 | } |
d914ba37 JF |
648 | |
649 | if (file->flags & EVENT_FILE_FL_RECORDED_TGID) { | |
650 | tracing_stop_tgid_record(); | |
7685ab6c | 651 | clear_bit(EVENT_FILE_FL_RECORDED_TGID_BIT, &file->flags); |
d914ba37 JF |
652 | } |
653 | ||
ae63b31e | 654 | call->class->reg(call, TRACE_REG_UNREGISTER, file); |
fd994989 | 655 | } |
3baa5e4c | 656 | /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT, else clear it */ |
5d6ad960 SRRH |
657 | if (file->flags & EVENT_FILE_FL_SOFT_MODE) |
658 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); | |
3baa5e4c | 659 | else |
5d6ad960 | 660 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
fd994989 SR |
661 | break; |
662 | case 1: | |
417944c4 SRRH |
663 | /* |
664 | * When soft_disable is set and enable is set, we want to | |
665 | * register the tracepoint for the event, but leave the event | |
666 | * as is. That means, if the event was already enabled, we do | |
667 | * nothing (but set SOFT_MODE). If the event is disabled, we | |
668 | * set SOFT_DISABLED before enabling the event tracepoint, so | |
669 | * it still seems to be disabled. | |
670 | */ | |
671 | if (!soft_disable) | |
5d6ad960 | 672 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
1cf4c073 MH |
673 | else { |
674 | if (atomic_inc_return(&file->sm_ref) > 1) | |
675 | break; | |
5d6ad960 | 676 | set_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); |
dea49978 ZY |
677 | /* Enable use of trace_buffered_event */ |
678 | trace_buffered_event_enable(); | |
1cf4c073 | 679 | } |
417944c4 | 680 | |
5d6ad960 | 681 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) { |
d914ba37 | 682 | bool cmd = false, tgid = false; |
417944c4 SRRH |
683 | |
684 | /* Keep the event disabled, when going to SOFT_MODE. */ | |
685 | if (soft_disable) | |
5d6ad960 | 686 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
417944c4 | 687 | |
983f938a | 688 | if (tr->trace_flags & TRACE_ITER_RECORD_CMD) { |
d914ba37 | 689 | cmd = true; |
e870e9a1 | 690 | tracing_start_cmdline_record(); |
5d6ad960 | 691 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 692 | } |
d914ba37 JF |
693 | |
694 | if (tr->trace_flags & TRACE_ITER_RECORD_TGID) { | |
695 | tgid = true; | |
696 | tracing_start_tgid_record(); | |
697 | set_bit(EVENT_FILE_FL_RECORDED_TGID_BIT, &file->flags); | |
698 | } | |
699 | ||
ae63b31e | 700 | ret = call->class->reg(call, TRACE_REG_REGISTER, file); |
3b8e4273 | 701 | if (ret) { |
d914ba37 JF |
702 | if (cmd) |
703 | tracing_stop_cmdline_record(); | |
704 | if (tgid) | |
705 | tracing_stop_tgid_record(); | |
3b8e4273 | 706 | pr_info("event trace: Could not enable event " |
687fcc4a | 707 | "%s\n", trace_event_name(call)); |
3b8e4273 LZ |
708 | break; |
709 | } | |
5d6ad960 | 710 | set_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); |
575380da SRRH |
711 | |
712 | /* WAS_ENABLED gets set but never cleared. */ | |
065e63f9 | 713 | set_bit(EVENT_FILE_FL_WAS_ENABLED_BIT, &file->flags); |
fd994989 | 714 | } |
fd994989 SR |
715 | break; |
716 | } | |
3b8e4273 LZ |
717 | |
718 | return ret; | |
fd994989 SR |
719 | } |
720 | ||
7f1d2f82 | 721 | int trace_event_enable_disable(struct trace_event_file *file, |
85f2b082 TZ |
722 | int enable, int soft_disable) |
723 | { | |
724 | return __ftrace_event_enable_disable(file, enable, soft_disable); | |
725 | } | |
726 | ||
7f1d2f82 | 727 | static int ftrace_event_enable_disable(struct trace_event_file *file, |
417944c4 SRRH |
728 | int enable) |
729 | { | |
730 | return __ftrace_event_enable_disable(file, enable, 0); | |
731 | } | |
732 | ||
ae63b31e | 733 | static void ftrace_clear_events(struct trace_array *tr) |
0e907c99 | 734 | { |
7f1d2f82 | 735 | struct trace_event_file *file; |
0e907c99 Z |
736 | |
737 | mutex_lock(&event_mutex); | |
ae63b31e SR |
738 | list_for_each_entry(file, &tr->events, list) { |
739 | ftrace_event_enable_disable(file, 0); | |
0e907c99 Z |
740 | } |
741 | mutex_unlock(&event_mutex); | |
742 | } | |
743 | ||
c37775d5 SR |
744 | static void |
745 | event_filter_pid_sched_process_exit(void *data, struct task_struct *task) | |
746 | { | |
747 | struct trace_pid_list *pid_list; | |
748 | struct trace_array *tr = data; | |
749 | ||
da25a672 | 750 | pid_list = rcu_dereference_raw(tr->filtered_pids); |
4e267db1 | 751 | trace_filter_add_remove_task(pid_list, NULL, task); |
27683626 SRV |
752 | |
753 | pid_list = rcu_dereference_raw(tr->filtered_no_pids); | |
754 | trace_filter_add_remove_task(pid_list, NULL, task); | |
c37775d5 SR |
755 | } |
756 | ||
757 | static void | |
758 | event_filter_pid_sched_process_fork(void *data, | |
759 | struct task_struct *self, | |
760 | struct task_struct *task) | |
761 | { | |
762 | struct trace_pid_list *pid_list; | |
763 | struct trace_array *tr = data; | |
764 | ||
765 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
4e267db1 | 766 | trace_filter_add_remove_task(pid_list, self, task); |
27683626 SRV |
767 | |
768 | pid_list = rcu_dereference_sched(tr->filtered_no_pids); | |
769 | trace_filter_add_remove_task(pid_list, self, task); | |
c37775d5 SR |
770 | } |
771 | ||
772 | void trace_event_follow_fork(struct trace_array *tr, bool enable) | |
773 | { | |
774 | if (enable) { | |
775 | register_trace_prio_sched_process_fork(event_filter_pid_sched_process_fork, | |
776 | tr, INT_MIN); | |
afcab636 | 777 | register_trace_prio_sched_process_free(event_filter_pid_sched_process_exit, |
c37775d5 SR |
778 | tr, INT_MAX); |
779 | } else { | |
780 | unregister_trace_sched_process_fork(event_filter_pid_sched_process_fork, | |
781 | tr); | |
afcab636 | 782 | unregister_trace_sched_process_free(event_filter_pid_sched_process_exit, |
c37775d5 SR |
783 | tr); |
784 | } | |
3fdaf80f SRRH |
785 | } |
786 | ||
787 | static void | |
22402cd0 | 788 | event_filter_pid_sched_switch_probe_pre(void *data, bool preempt, |
fa2c3254 | 789 | struct task_struct *prev, |
9c2136be DK |
790 | struct task_struct *next, |
791 | unsigned int prev_state) | |
3fdaf80f SRRH |
792 | { |
793 | struct trace_array *tr = data; | |
27683626 | 794 | struct trace_pid_list *no_pid_list; |
3fdaf80f | 795 | struct trace_pid_list *pid_list; |
27683626 | 796 | bool ret; |
3fdaf80f SRRH |
797 | |
798 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
27683626 | 799 | no_pid_list = rcu_dereference_sched(tr->filtered_no_pids); |
3fdaf80f | 800 | |
27683626 SRV |
801 | /* |
802 | * Sched switch is funny, as we only want to ignore it | |
803 | * in the notrace case if both prev and next should be ignored. | |
804 | */ | |
805 | ret = trace_ignore_this_task(NULL, no_pid_list, prev) && | |
806 | trace_ignore_this_task(NULL, no_pid_list, next); | |
807 | ||
808 | this_cpu_write(tr->array_buffer.data->ignore_pid, ret || | |
809 | (trace_ignore_this_task(pid_list, NULL, prev) && | |
810 | trace_ignore_this_task(pid_list, NULL, next))); | |
3fdaf80f SRRH |
811 | } |
812 | ||
813 | static void | |
22402cd0 | 814 | event_filter_pid_sched_switch_probe_post(void *data, bool preempt, |
fa2c3254 | 815 | struct task_struct *prev, |
9c2136be DK |
816 | struct task_struct *next, |
817 | unsigned int prev_state) | |
3fdaf80f SRRH |
818 | { |
819 | struct trace_array *tr = data; | |
27683626 | 820 | struct trace_pid_list *no_pid_list; |
3fdaf80f SRRH |
821 | struct trace_pid_list *pid_list; |
822 | ||
823 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
27683626 | 824 | no_pid_list = rcu_dereference_sched(tr->filtered_no_pids); |
3fdaf80f | 825 | |
1c5eb448 | 826 | this_cpu_write(tr->array_buffer.data->ignore_pid, |
27683626 | 827 | trace_ignore_this_task(pid_list, no_pid_list, next)); |
3fdaf80f SRRH |
828 | } |
829 | ||
830 | static void | |
831 | event_filter_pid_sched_wakeup_probe_pre(void *data, struct task_struct *task) | |
832 | { | |
833 | struct trace_array *tr = data; | |
27683626 | 834 | struct trace_pid_list *no_pid_list; |
3fdaf80f SRRH |
835 | struct trace_pid_list *pid_list; |
836 | ||
837 | /* Nothing to do if we are already tracing */ | |
1c5eb448 | 838 | if (!this_cpu_read(tr->array_buffer.data->ignore_pid)) |
3fdaf80f SRRH |
839 | return; |
840 | ||
841 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
27683626 | 842 | no_pid_list = rcu_dereference_sched(tr->filtered_no_pids); |
3fdaf80f | 843 | |
1c5eb448 | 844 | this_cpu_write(tr->array_buffer.data->ignore_pid, |
27683626 | 845 | trace_ignore_this_task(pid_list, no_pid_list, task)); |
3fdaf80f SRRH |
846 | } |
847 | ||
848 | static void | |
849 | event_filter_pid_sched_wakeup_probe_post(void *data, struct task_struct *task) | |
850 | { | |
851 | struct trace_array *tr = data; | |
27683626 | 852 | struct trace_pid_list *no_pid_list; |
3fdaf80f SRRH |
853 | struct trace_pid_list *pid_list; |
854 | ||
855 | /* Nothing to do if we are not tracing */ | |
1c5eb448 | 856 | if (this_cpu_read(tr->array_buffer.data->ignore_pid)) |
3fdaf80f SRRH |
857 | return; |
858 | ||
859 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
27683626 | 860 | no_pid_list = rcu_dereference_sched(tr->filtered_no_pids); |
3fdaf80f SRRH |
861 | |
862 | /* Set tracing if current is enabled */ | |
1c5eb448 | 863 | this_cpu_write(tr->array_buffer.data->ignore_pid, |
27683626 | 864 | trace_ignore_this_task(pid_list, no_pid_list, current)); |
3fdaf80f SRRH |
865 | } |
866 | ||
27683626 | 867 | static void unregister_pid_events(struct trace_array *tr) |
49090107 | 868 | { |
3fdaf80f SRRH |
869 | unregister_trace_sched_switch(event_filter_pid_sched_switch_probe_pre, tr); |
870 | unregister_trace_sched_switch(event_filter_pid_sched_switch_probe_post, tr); | |
871 | ||
872 | unregister_trace_sched_wakeup(event_filter_pid_sched_wakeup_probe_pre, tr); | |
873 | unregister_trace_sched_wakeup(event_filter_pid_sched_wakeup_probe_post, tr); | |
874 | ||
0f72e37e SRRH |
875 | unregister_trace_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_pre, tr); |
876 | unregister_trace_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_post, tr); | |
877 | ||
878 | unregister_trace_sched_waking(event_filter_pid_sched_wakeup_probe_pre, tr); | |
879 | unregister_trace_sched_waking(event_filter_pid_sched_wakeup_probe_post, tr); | |
27683626 | 880 | } |
0f72e37e | 881 | |
27683626 SRV |
882 | static void __ftrace_clear_event_pids(struct trace_array *tr, int type) |
883 | { | |
884 | struct trace_pid_list *pid_list; | |
885 | struct trace_pid_list *no_pid_list; | |
886 | struct trace_event_file *file; | |
887 | int cpu; | |
888 | ||
889 | pid_list = rcu_dereference_protected(tr->filtered_pids, | |
890 | lockdep_is_held(&event_mutex)); | |
891 | no_pid_list = rcu_dereference_protected(tr->filtered_no_pids, | |
892 | lockdep_is_held(&event_mutex)); | |
893 | ||
894 | /* Make sure there's something to do */ | |
895 | if (!pid_type_enabled(type, pid_list, no_pid_list)) | |
896 | return; | |
897 | ||
898 | if (!still_need_pid_events(type, pid_list, no_pid_list)) { | |
899 | unregister_pid_events(tr); | |
900 | ||
901 | list_for_each_entry(file, &tr->events, list) { | |
902 | clear_bit(EVENT_FILE_FL_PID_FILTER_BIT, &file->flags); | |
903 | } | |
904 | ||
905 | for_each_possible_cpu(cpu) | |
906 | per_cpu_ptr(tr->array_buffer.data, cpu)->ignore_pid = false; | |
3fdaf80f SRRH |
907 | } |
908 | ||
27683626 SRV |
909 | if (type & TRACE_PIDS) |
910 | rcu_assign_pointer(tr->filtered_pids, NULL); | |
3fdaf80f | 911 | |
27683626 SRV |
912 | if (type & TRACE_NO_PIDS) |
913 | rcu_assign_pointer(tr->filtered_no_pids, NULL); | |
49090107 SRRH |
914 | |
915 | /* Wait till all users are no longer using pid filtering */ | |
e0a568dc | 916 | tracepoint_synchronize_unregister(); |
49090107 | 917 | |
27683626 | 918 | if ((type & TRACE_PIDS) && pid_list) |
6954e415 | 919 | trace_pid_list_free(pid_list); |
27683626 SRV |
920 | |
921 | if ((type & TRACE_NO_PIDS) && no_pid_list) | |
6954e415 | 922 | trace_pid_list_free(no_pid_list); |
49090107 SRRH |
923 | } |
924 | ||
27683626 | 925 | static void ftrace_clear_event_pids(struct trace_array *tr, int type) |
49090107 SRRH |
926 | { |
927 | mutex_lock(&event_mutex); | |
27683626 | 928 | __ftrace_clear_event_pids(tr, type); |
49090107 SRRH |
929 | mutex_unlock(&event_mutex); |
930 | } | |
931 | ||
e9dbfae5 SR |
932 | static void __put_system(struct event_subsystem *system) |
933 | { | |
934 | struct event_filter *filter = system->filter; | |
935 | ||
6e94a780 SR |
936 | WARN_ON_ONCE(system_refcount(system) == 0); |
937 | if (system_refcount_dec(system)) | |
e9dbfae5 SR |
938 | return; |
939 | ||
ae63b31e SR |
940 | list_del(&system->list); |
941 | ||
e9dbfae5 SR |
942 | if (filter) { |
943 | kfree(filter->filter_string); | |
944 | kfree(filter); | |
945 | } | |
79ac6ef5 | 946 | kfree_const(system->name); |
e9dbfae5 SR |
947 | kfree(system); |
948 | } | |
949 | ||
950 | static void __get_system(struct event_subsystem *system) | |
951 | { | |
6e94a780 SR |
952 | WARN_ON_ONCE(system_refcount(system) == 0); |
953 | system_refcount_inc(system); | |
e9dbfae5 SR |
954 | } |
955 | ||
7967b3e0 | 956 | static void __get_system_dir(struct trace_subsystem_dir *dir) |
ae63b31e SR |
957 | { |
958 | WARN_ON_ONCE(dir->ref_count == 0); | |
959 | dir->ref_count++; | |
960 | __get_system(dir->subsystem); | |
961 | } | |
962 | ||
7967b3e0 | 963 | static void __put_system_dir(struct trace_subsystem_dir *dir) |
ae63b31e SR |
964 | { |
965 | WARN_ON_ONCE(dir->ref_count == 0); | |
966 | /* If the subsystem is about to be freed, the dir must be too */ | |
6e94a780 | 967 | WARN_ON_ONCE(system_refcount(dir->subsystem) == 1 && dir->ref_count != 1); |
ae63b31e SR |
968 | |
969 | __put_system(dir->subsystem); | |
970 | if (!--dir->ref_count) | |
971 | kfree(dir); | |
972 | } | |
973 | ||
7967b3e0 | 974 | static void put_system(struct trace_subsystem_dir *dir) |
e9dbfae5 SR |
975 | { |
976 | mutex_lock(&event_mutex); | |
ae63b31e | 977 | __put_system_dir(dir); |
e9dbfae5 SR |
978 | mutex_unlock(&event_mutex); |
979 | } | |
980 | ||
7967b3e0 | 981 | static void remove_subsystem(struct trace_subsystem_dir *dir) |
f6a84bdc ON |
982 | { |
983 | if (!dir) | |
984 | return; | |
985 | ||
986 | if (!--dir->nr_events) { | |
27152bce | 987 | eventfs_remove(dir->ef); |
f6a84bdc ON |
988 | list_del(&dir->list); |
989 | __put_system_dir(dir); | |
990 | } | |
991 | } | |
992 | ||
7f1d2f82 | 993 | static void remove_event_file_dir(struct trace_event_file *file) |
f6a84bdc | 994 | { |
27152bce | 995 | eventfs_remove(file->ef); |
f6a84bdc | 996 | list_del(&file->list); |
f6a84bdc | 997 | remove_subsystem(file->system); |
2448e349 | 998 | free_event_filter(file->filter); |
f6a84bdc ON |
999 | kmem_cache_free(file_cachep, file); |
1000 | } | |
1001 | ||
8f31bfe5 LZ |
1002 | /* |
1003 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
1004 | */ | |
2a6c24af SRRH |
1005 | static int |
1006 | __ftrace_set_clr_event_nolock(struct trace_array *tr, const char *match, | |
1007 | const char *sub, const char *event, int set) | |
b77e38aa | 1008 | { |
7f1d2f82 | 1009 | struct trace_event_file *file; |
2425bcb9 | 1010 | struct trace_event_call *call; |
de7b2973 | 1011 | const char *name; |
29f93943 | 1012 | int ret = -EINVAL; |
989a0a3d | 1013 | int eret = 0; |
8f31bfe5 | 1014 | |
ae63b31e SR |
1015 | list_for_each_entry(file, &tr->events, list) { |
1016 | ||
1017 | call = file->event_call; | |
687fcc4a | 1018 | name = trace_event_name(call); |
8f31bfe5 | 1019 | |
de7b2973 | 1020 | if (!name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
1021 | continue; |
1022 | ||
9b63776f SR |
1023 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
1024 | continue; | |
1025 | ||
8f31bfe5 | 1026 | if (match && |
de7b2973 | 1027 | strcmp(match, name) != 0 && |
8f082018 | 1028 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
1029 | continue; |
1030 | ||
8f082018 | 1031 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
1032 | continue; |
1033 | ||
de7b2973 | 1034 | if (event && strcmp(event, name) != 0) |
8f31bfe5 LZ |
1035 | continue; |
1036 | ||
989a0a3d | 1037 | ret = ftrace_event_enable_disable(file, set); |
8f31bfe5 | 1038 | |
989a0a3d SRRH |
1039 | /* |
1040 | * Save the first error and return that. Some events | |
1041 | * may still have been enabled, but let the user | |
1042 | * know that something went wrong. | |
1043 | */ | |
1044 | if (ret && !eret) | |
1045 | eret = ret; | |
1046 | ||
1047 | ret = eret; | |
8f31bfe5 | 1048 | } |
2a6c24af SRRH |
1049 | |
1050 | return ret; | |
1051 | } | |
1052 | ||
1053 | static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, | |
1054 | const char *sub, const char *event, int set) | |
1055 | { | |
1056 | int ret; | |
1057 | ||
1058 | mutex_lock(&event_mutex); | |
1059 | ret = __ftrace_set_clr_event_nolock(tr, match, sub, event, set); | |
8f31bfe5 LZ |
1060 | mutex_unlock(&event_mutex); |
1061 | ||
1062 | return ret; | |
1063 | } | |
1064 | ||
595a438c | 1065 | int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set) |
8f31bfe5 | 1066 | { |
b628b3e6 | 1067 | char *event = NULL, *sub = NULL, *match; |
84fce9db | 1068 | int ret; |
b628b3e6 | 1069 | |
953ae45a DI |
1070 | if (!tr) |
1071 | return -ENOENT; | |
b628b3e6 SR |
1072 | /* |
1073 | * The buf format can be <subsystem>:<event-name> | |
1074 | * *:<event-name> means any event by that name. | |
1075 | * :<event-name> is the same. | |
1076 | * | |
1077 | * <subsystem>:* means all events in that subsystem | |
1078 | * <subsystem>: means the same. | |
1079 | * | |
1080 | * <name> (no ':') means all events in a subsystem with | |
1081 | * the name <name> or any event that matches <name> | |
1082 | */ | |
1083 | ||
1084 | match = strsep(&buf, ":"); | |
1085 | if (buf) { | |
1086 | sub = match; | |
1087 | event = buf; | |
1088 | match = NULL; | |
1089 | ||
1090 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
1091 | sub = NULL; | |
1092 | if (!strlen(event) || strcmp(event, "*") == 0) | |
1093 | event = NULL; | |
1094 | } | |
b77e38aa | 1095 | |
84fce9db JK |
1096 | ret = __ftrace_set_clr_event(tr, match, sub, event, set); |
1097 | ||
1098 | /* Put back the colon to allow this to be called again */ | |
1099 | if (buf) | |
1100 | *(buf - 1) = ':'; | |
1101 | ||
1102 | return ret; | |
b77e38aa SR |
1103 | } |
1104 | ||
4671c794 SR |
1105 | /** |
1106 | * trace_set_clr_event - enable or disable an event | |
1107 | * @system: system name to match (NULL for any system) | |
1108 | * @event: event name to match (NULL for all events, within system) | |
1109 | * @set: 1 to enable, 0 to disable | |
1110 | * | |
1111 | * This is a way for other parts of the kernel to enable or disable | |
1112 | * event recording. | |
1113 | * | |
1114 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
1115 | * registered events. | |
1116 | */ | |
1117 | int trace_set_clr_event(const char *system, const char *event, int set) | |
1118 | { | |
ae63b31e SR |
1119 | struct trace_array *tr = top_trace_array(); |
1120 | ||
dc81e5e3 YY |
1121 | if (!tr) |
1122 | return -ENODEV; | |
1123 | ||
ae63b31e | 1124 | return __ftrace_set_clr_event(tr, NULL, system, event, set); |
4671c794 | 1125 | } |
56355b83 | 1126 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 1127 | |
28879787 DI |
1128 | /** |
1129 | * trace_array_set_clr_event - enable or disable an event for a trace array. | |
1130 | * @tr: concerned trace array. | |
1131 | * @system: system name to match (NULL for any system) | |
1132 | * @event: event name to match (NULL for all events, within system) | |
1133 | * @enable: true to enable, false to disable | |
1134 | * | |
1135 | * This is a way for other parts of the kernel to enable or disable | |
1136 | * event recording. | |
1137 | * | |
1138 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
1139 | * registered events. | |
1140 | */ | |
1141 | int trace_array_set_clr_event(struct trace_array *tr, const char *system, | |
1142 | const char *event, bool enable) | |
1143 | { | |
1144 | int set; | |
1145 | ||
1146 | if (!tr) | |
1147 | return -ENOENT; | |
1148 | ||
1149 | set = (enable == true) ? 1 : 0; | |
1150 | return __ftrace_set_clr_event(tr, NULL, system, event, set); | |
1151 | } | |
1152 | EXPORT_SYMBOL_GPL(trace_array_set_clr_event); | |
1153 | ||
b77e38aa SR |
1154 | /* 128 should be much more than enough */ |
1155 | #define EVENT_BUF_SIZE 127 | |
1156 | ||
1157 | static ssize_t | |
1158 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
1159 | size_t cnt, loff_t *ppos) | |
1160 | { | |
48966364 | 1161 | struct trace_parser parser; |
ae63b31e SR |
1162 | struct seq_file *m = file->private_data; |
1163 | struct trace_array *tr = m->private; | |
4ba7978e | 1164 | ssize_t read, ret; |
b77e38aa | 1165 | |
4ba7978e | 1166 | if (!cnt) |
b77e38aa SR |
1167 | return 0; |
1168 | ||
1852fcce SR |
1169 | ret = tracing_update_buffers(); |
1170 | if (ret < 0) | |
1171 | return ret; | |
1172 | ||
48966364 | 1173 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
1174 | return -ENOMEM; |
1175 | ||
48966364 | 1176 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
1177 | ||
4ba7978e | 1178 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 1179 | int set = 1; |
b77e38aa | 1180 | |
48966364 | 1181 | if (*parser.buffer == '!') |
b77e38aa | 1182 | set = 0; |
b77e38aa | 1183 | |
ae63b31e | 1184 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
b77e38aa | 1185 | if (ret) |
48966364 | 1186 | goto out_put; |
b77e38aa | 1187 | } |
b77e38aa SR |
1188 | |
1189 | ret = read; | |
1190 | ||
48966364 | 1191 | out_put: |
1192 | trace_parser_put(&parser); | |
b77e38aa SR |
1193 | |
1194 | return ret; | |
1195 | } | |
1196 | ||
1197 | static void * | |
1198 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
1199 | { | |
7f1d2f82 | 1200 | struct trace_event_file *file = v; |
2425bcb9 | 1201 | struct trace_event_call *call; |
ae63b31e | 1202 | struct trace_array *tr = m->private; |
b77e38aa SR |
1203 | |
1204 | (*pos)++; | |
1205 | ||
ae63b31e SR |
1206 | list_for_each_entry_continue(file, &tr->events, list) { |
1207 | call = file->event_call; | |
40e26815 SR |
1208 | /* |
1209 | * The ftrace subsystem is for showing formats only. | |
1210 | * They can not be enabled or disabled via the event files. | |
1211 | */ | |
d045437a SRRH |
1212 | if (call->class && call->class->reg && |
1213 | !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) | |
ae63b31e | 1214 | return file; |
40e26815 | 1215 | } |
b77e38aa | 1216 | |
30bd39cd | 1217 | return NULL; |
b77e38aa SR |
1218 | } |
1219 | ||
1220 | static void *t_start(struct seq_file *m, loff_t *pos) | |
1221 | { | |
7f1d2f82 | 1222 | struct trace_event_file *file; |
ae63b31e | 1223 | struct trace_array *tr = m->private; |
e1c7e2a6 LZ |
1224 | loff_t l; |
1225 | ||
20c8928a | 1226 | mutex_lock(&event_mutex); |
e1c7e2a6 | 1227 | |
7f1d2f82 | 1228 | file = list_entry(&tr->events, struct trace_event_file, list); |
e1c7e2a6 | 1229 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
1230 | file = t_next(m, file, &l); |
1231 | if (!file) | |
e1c7e2a6 LZ |
1232 | break; |
1233 | } | |
ae63b31e | 1234 | return file; |
b77e38aa SR |
1235 | } |
1236 | ||
1237 | static void * | |
1238 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
1239 | { | |
7f1d2f82 | 1240 | struct trace_event_file *file = v; |
ae63b31e | 1241 | struct trace_array *tr = m->private; |
b77e38aa SR |
1242 | |
1243 | (*pos)++; | |
1244 | ||
ae63b31e | 1245 | list_for_each_entry_continue(file, &tr->events, list) { |
5d6ad960 | 1246 | if (file->flags & EVENT_FILE_FL_ENABLED) |
ae63b31e | 1247 | return file; |
b77e38aa SR |
1248 | } |
1249 | ||
30bd39cd | 1250 | return NULL; |
b77e38aa SR |
1251 | } |
1252 | ||
1253 | static void *s_start(struct seq_file *m, loff_t *pos) | |
1254 | { | |
7f1d2f82 | 1255 | struct trace_event_file *file; |
ae63b31e | 1256 | struct trace_array *tr = m->private; |
e1c7e2a6 LZ |
1257 | loff_t l; |
1258 | ||
20c8928a | 1259 | mutex_lock(&event_mutex); |
e1c7e2a6 | 1260 | |
7f1d2f82 | 1261 | file = list_entry(&tr->events, struct trace_event_file, list); |
e1c7e2a6 | 1262 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
1263 | file = s_next(m, file, &l); |
1264 | if (!file) | |
e1c7e2a6 LZ |
1265 | break; |
1266 | } | |
ae63b31e | 1267 | return file; |
b77e38aa SR |
1268 | } |
1269 | ||
1270 | static int t_show(struct seq_file *m, void *v) | |
1271 | { | |
7f1d2f82 | 1272 | struct trace_event_file *file = v; |
2425bcb9 | 1273 | struct trace_event_call *call = file->event_call; |
b77e38aa | 1274 | |
8f082018 SR |
1275 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
1276 | seq_printf(m, "%s:", call->class->system); | |
687fcc4a | 1277 | seq_printf(m, "%s\n", trace_event_name(call)); |
b77e38aa SR |
1278 | |
1279 | return 0; | |
1280 | } | |
1281 | ||
1282 | static void t_stop(struct seq_file *m, void *p) | |
1283 | { | |
20c8928a | 1284 | mutex_unlock(&event_mutex); |
b77e38aa SR |
1285 | } |
1286 | ||
f4d34a87 | 1287 | static void * |
27683626 | 1288 | __next(struct seq_file *m, void *v, loff_t *pos, int type) |
f4d34a87 SR |
1289 | { |
1290 | struct trace_array *tr = m->private; | |
27683626 SRV |
1291 | struct trace_pid_list *pid_list; |
1292 | ||
1293 | if (type == TRACE_PIDS) | |
1294 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
1295 | else | |
1296 | pid_list = rcu_dereference_sched(tr->filtered_no_pids); | |
f4d34a87 | 1297 | |
5cc8976b | 1298 | return trace_pid_next(pid_list, v, pos); |
f4d34a87 SR |
1299 | } |
1300 | ||
27683626 SRV |
1301 | static void * |
1302 | p_next(struct seq_file *m, void *v, loff_t *pos) | |
1303 | { | |
1304 | return __next(m, v, pos, TRACE_PIDS); | |
1305 | } | |
1306 | ||
1307 | static void * | |
1308 | np_next(struct seq_file *m, void *v, loff_t *pos) | |
1309 | { | |
1310 | return __next(m, v, pos, TRACE_NO_PIDS); | |
1311 | } | |
1312 | ||
1313 | static void *__start(struct seq_file *m, loff_t *pos, int type) | |
fb662288 | 1314 | __acquires(RCU) |
49090107 SRRH |
1315 | { |
1316 | struct trace_pid_list *pid_list; | |
1317 | struct trace_array *tr = m->private; | |
1318 | ||
1319 | /* | |
1320 | * Grab the mutex, to keep calls to p_next() having the same | |
1321 | * tr->filtered_pids as p_start() has. | |
1322 | * If we just passed the tr->filtered_pids around, then RCU would | |
1323 | * have been enough, but doing that makes things more complex. | |
1324 | */ | |
1325 | mutex_lock(&event_mutex); | |
1326 | rcu_read_lock_sched(); | |
1327 | ||
27683626 SRV |
1328 | if (type == TRACE_PIDS) |
1329 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
1330 | else | |
1331 | pid_list = rcu_dereference_sched(tr->filtered_no_pids); | |
49090107 | 1332 | |
f4d34a87 | 1333 | if (!pid_list) |
49090107 SRRH |
1334 | return NULL; |
1335 | ||
5cc8976b | 1336 | return trace_pid_start(pid_list, pos); |
49090107 SRRH |
1337 | } |
1338 | ||
27683626 SRV |
1339 | static void *p_start(struct seq_file *m, loff_t *pos) |
1340 | __acquires(RCU) | |
1341 | { | |
1342 | return __start(m, pos, TRACE_PIDS); | |
1343 | } | |
1344 | ||
1345 | static void *np_start(struct seq_file *m, loff_t *pos) | |
1346 | __acquires(RCU) | |
1347 | { | |
1348 | return __start(m, pos, TRACE_NO_PIDS); | |
1349 | } | |
1350 | ||
49090107 | 1351 | static void p_stop(struct seq_file *m, void *p) |
fb662288 | 1352 | __releases(RCU) |
49090107 SRRH |
1353 | { |
1354 | rcu_read_unlock_sched(); | |
1355 | mutex_unlock(&event_mutex); | |
1356 | } | |
1357 | ||
1473e441 SR |
1358 | static ssize_t |
1359 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1360 | loff_t *ppos) | |
1361 | { | |
7f1d2f82 | 1362 | struct trace_event_file *file; |
bc6f6b08 | 1363 | unsigned long flags; |
a4390596 TZ |
1364 | char buf[4] = "0"; |
1365 | ||
bc6f6b08 ON |
1366 | mutex_lock(&event_mutex); |
1367 | file = event_file_data(filp); | |
1368 | if (likely(file)) | |
1369 | flags = file->flags; | |
1370 | mutex_unlock(&event_mutex); | |
1371 | ||
1372 | if (!file) | |
1373 | return -ENODEV; | |
1374 | ||
5d6ad960 SRRH |
1375 | if (flags & EVENT_FILE_FL_ENABLED && |
1376 | !(flags & EVENT_FILE_FL_SOFT_DISABLED)) | |
a4390596 TZ |
1377 | strcpy(buf, "1"); |
1378 | ||
5d6ad960 SRRH |
1379 | if (flags & EVENT_FILE_FL_SOFT_DISABLED || |
1380 | flags & EVENT_FILE_FL_SOFT_MODE) | |
a4390596 TZ |
1381 | strcat(buf, "*"); |
1382 | ||
1383 | strcat(buf, "\n"); | |
1473e441 | 1384 | |
417944c4 | 1385 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf)); |
1473e441 SR |
1386 | } |
1387 | ||
1388 | static ssize_t | |
1389 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1390 | loff_t *ppos) | |
1391 | { | |
7f1d2f82 | 1392 | struct trace_event_file *file; |
1473e441 SR |
1393 | unsigned long val; |
1394 | int ret; | |
1395 | ||
22fe9b54 PH |
1396 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
1397 | if (ret) | |
1473e441 SR |
1398 | return ret; |
1399 | ||
1852fcce SR |
1400 | ret = tracing_update_buffers(); |
1401 | if (ret < 0) | |
1402 | return ret; | |
1403 | ||
1473e441 SR |
1404 | switch (val) { |
1405 | case 0: | |
1473e441 | 1406 | case 1: |
bc6f6b08 | 1407 | ret = -ENODEV; |
11a241a3 | 1408 | mutex_lock(&event_mutex); |
bc6f6b08 ON |
1409 | file = event_file_data(filp); |
1410 | if (likely(file)) | |
1411 | ret = ftrace_event_enable_disable(file, val); | |
11a241a3 | 1412 | mutex_unlock(&event_mutex); |
1473e441 SR |
1413 | break; |
1414 | ||
1415 | default: | |
1416 | return -EINVAL; | |
1417 | } | |
1418 | ||
1419 | *ppos += cnt; | |
1420 | ||
3b8e4273 | 1421 | return ret ? ret : cnt; |
1473e441 SR |
1422 | } |
1423 | ||
8ae79a13 SR |
1424 | static ssize_t |
1425 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1426 | loff_t *ppos) | |
1427 | { | |
c142b15d | 1428 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
7967b3e0 | 1429 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1430 | struct event_subsystem *system = dir->subsystem; |
2425bcb9 | 1431 | struct trace_event_call *call; |
7f1d2f82 | 1432 | struct trace_event_file *file; |
ae63b31e | 1433 | struct trace_array *tr = dir->tr; |
8ae79a13 | 1434 | char buf[2]; |
c142b15d | 1435 | int set = 0; |
8ae79a13 SR |
1436 | int ret; |
1437 | ||
8ae79a13 | 1438 | mutex_lock(&event_mutex); |
ae63b31e SR |
1439 | list_for_each_entry(file, &tr->events, list) { |
1440 | call = file->event_call; | |
256cfdd6 SRV |
1441 | if ((call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) || |
1442 | !trace_event_name(call) || !call->class || !call->class->reg) | |
8ae79a13 SR |
1443 | continue; |
1444 | ||
40ee4dff | 1445 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
1446 | continue; |
1447 | ||
1448 | /* | |
1449 | * We need to find out if all the events are set | |
1450 | * or if all events or cleared, or if we have | |
1451 | * a mixture. | |
1452 | */ | |
5d6ad960 | 1453 | set |= (1 << !!(file->flags & EVENT_FILE_FL_ENABLED)); |
c142b15d | 1454 | |
8ae79a13 SR |
1455 | /* |
1456 | * If we have a mixture, no need to look further. | |
1457 | */ | |
c142b15d | 1458 | if (set == 3) |
8ae79a13 SR |
1459 | break; |
1460 | } | |
1461 | mutex_unlock(&event_mutex); | |
1462 | ||
c142b15d | 1463 | buf[0] = set_to_char[set]; |
8ae79a13 | 1464 | buf[1] = '\n'; |
8ae79a13 SR |
1465 | |
1466 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
1467 | ||
1468 | return ret; | |
1469 | } | |
1470 | ||
1471 | static ssize_t | |
1472 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1473 | loff_t *ppos) | |
1474 | { | |
7967b3e0 | 1475 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1476 | struct event_subsystem *system = dir->subsystem; |
40ee4dff | 1477 | const char *name = NULL; |
8ae79a13 | 1478 | unsigned long val; |
8ae79a13 SR |
1479 | ssize_t ret; |
1480 | ||
22fe9b54 PH |
1481 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
1482 | if (ret) | |
8ae79a13 SR |
1483 | return ret; |
1484 | ||
1485 | ret = tracing_update_buffers(); | |
1486 | if (ret < 0) | |
1487 | return ret; | |
1488 | ||
8f31bfe5 | 1489 | if (val != 0 && val != 1) |
8ae79a13 | 1490 | return -EINVAL; |
8ae79a13 | 1491 | |
40ee4dff SR |
1492 | /* |
1493 | * Opening of "enable" adds a ref count to system, | |
1494 | * so the name is safe to use. | |
1495 | */ | |
1496 | if (system) | |
1497 | name = system->name; | |
1498 | ||
ae63b31e | 1499 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
8ae79a13 | 1500 | if (ret) |
8f31bfe5 | 1501 | goto out; |
8ae79a13 SR |
1502 | |
1503 | ret = cnt; | |
1504 | ||
8f31bfe5 | 1505 | out: |
8ae79a13 SR |
1506 | *ppos += cnt; |
1507 | ||
1508 | return ret; | |
1509 | } | |
1510 | ||
2a37a3df SR |
1511 | enum { |
1512 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
1513 | FORMAT_FIELD_SEPERATOR = 2, |
1514 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
1515 | }; |
1516 | ||
1517 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 1518 | { |
2425bcb9 | 1519 | struct trace_event_call *call = event_file_data(m->private); |
86397dc3 LZ |
1520 | struct list_head *common_head = &ftrace_common_fields; |
1521 | struct list_head *head = trace_get_fields(call); | |
7710b639 | 1522 | struct list_head *node = v; |
981d081e | 1523 | |
2a37a3df | 1524 | (*pos)++; |
5a65e956 | 1525 | |
2a37a3df SR |
1526 | switch ((unsigned long)v) { |
1527 | case FORMAT_HEADER: | |
7710b639 ON |
1528 | node = common_head; |
1529 | break; | |
5a65e956 | 1530 | |
86397dc3 | 1531 | case FORMAT_FIELD_SEPERATOR: |
7710b639 ON |
1532 | node = head; |
1533 | break; | |
5a65e956 | 1534 | |
2a37a3df SR |
1535 | case FORMAT_PRINTFMT: |
1536 | /* all done */ | |
1537 | return NULL; | |
5a65e956 LJ |
1538 | } |
1539 | ||
7710b639 ON |
1540 | node = node->prev; |
1541 | if (node == common_head) | |
86397dc3 | 1542 | return (void *)FORMAT_FIELD_SEPERATOR; |
7710b639 | 1543 | else if (node == head) |
2a37a3df | 1544 | return (void *)FORMAT_PRINTFMT; |
7710b639 ON |
1545 | else |
1546 | return node; | |
2a37a3df SR |
1547 | } |
1548 | ||
1549 | static int f_show(struct seq_file *m, void *v) | |
1550 | { | |
2425bcb9 | 1551 | struct trace_event_call *call = event_file_data(m->private); |
2a37a3df SR |
1552 | struct ftrace_event_field *field; |
1553 | const char *array_descriptor; | |
1554 | ||
1555 | switch ((unsigned long)v) { | |
1556 | case FORMAT_HEADER: | |
687fcc4a | 1557 | seq_printf(m, "name: %s\n", trace_event_name(call)); |
2a37a3df | 1558 | seq_printf(m, "ID: %d\n", call->event.type); |
fa6f0cc7 | 1559 | seq_puts(m, "format:\n"); |
8728fe50 | 1560 | return 0; |
5a65e956 | 1561 | |
86397dc3 LZ |
1562 | case FORMAT_FIELD_SEPERATOR: |
1563 | seq_putc(m, '\n'); | |
1564 | return 0; | |
1565 | ||
2a37a3df SR |
1566 | case FORMAT_PRINTFMT: |
1567 | seq_printf(m, "\nprint fmt: %s\n", | |
1568 | call->print_fmt); | |
1569 | return 0; | |
981d081e | 1570 | } |
8728fe50 | 1571 | |
7710b639 | 1572 | field = list_entry(v, struct ftrace_event_field, link); |
2a37a3df SR |
1573 | /* |
1574 | * Smartly shows the array type(except dynamic array). | |
1575 | * Normal: | |
1576 | * field:TYPE VAR | |
1577 | * If TYPE := TYPE[LEN], it is shown: | |
1578 | * field:TYPE VAR[LEN] | |
1579 | */ | |
1580 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 1581 | |
b6b27355 | 1582 | if (str_has_prefix(field->type, "__data_loc")) |
2a37a3df | 1583 | array_descriptor = NULL; |
8728fe50 | 1584 | |
2a37a3df SR |
1585 | if (!array_descriptor) |
1586 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
1587 | field->type, field->name, field->offset, | |
1588 | field->size, !!field->is_signed); | |
b6c7abd1 YS |
1589 | else if (field->len) |
1590 | seq_printf(m, "\tfield:%.*s %s[%d];\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
2a37a3df SR |
1591 | (int)(array_descriptor - field->type), |
1592 | field->type, field->name, | |
b6c7abd1 | 1593 | field->len, field->offset, |
2a37a3df | 1594 | field->size, !!field->is_signed); |
b6c7abd1 YS |
1595 | else |
1596 | seq_printf(m, "\tfield:%.*s %s[];\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
1597 | (int)(array_descriptor - field->type), | |
1598 | field->type, field->name, | |
1599 | field->offset, field->size, !!field->is_signed); | |
8728fe50 | 1600 | |
2a37a3df SR |
1601 | return 0; |
1602 | } | |
5a65e956 | 1603 | |
7710b639 ON |
1604 | static void *f_start(struct seq_file *m, loff_t *pos) |
1605 | { | |
1606 | void *p = (void *)FORMAT_HEADER; | |
1607 | loff_t l = 0; | |
1608 | ||
c5a44a12 ON |
1609 | /* ->stop() is called even if ->start() fails */ |
1610 | mutex_lock(&event_mutex); | |
1611 | if (!event_file_data(m->private)) | |
1612 | return ERR_PTR(-ENODEV); | |
1613 | ||
7710b639 ON |
1614 | while (l < *pos && p) |
1615 | p = f_next(m, p, &l); | |
1616 | ||
1617 | return p; | |
1618 | } | |
1619 | ||
2a37a3df SR |
1620 | static void f_stop(struct seq_file *m, void *p) |
1621 | { | |
c5a44a12 | 1622 | mutex_unlock(&event_mutex); |
2a37a3df | 1623 | } |
981d081e | 1624 | |
2a37a3df SR |
1625 | static const struct seq_operations trace_format_seq_ops = { |
1626 | .start = f_start, | |
1627 | .next = f_next, | |
1628 | .stop = f_stop, | |
1629 | .show = f_show, | |
1630 | }; | |
1631 | ||
1632 | static int trace_format_open(struct inode *inode, struct file *file) | |
1633 | { | |
2a37a3df SR |
1634 | struct seq_file *m; |
1635 | int ret; | |
1636 | ||
17911ff3 SRV |
1637 | /* Do we want to hide event format files on tracefs lockdown? */ |
1638 | ||
2a37a3df SR |
1639 | ret = seq_open(file, &trace_format_seq_ops); |
1640 | if (ret < 0) | |
1641 | return ret; | |
1642 | ||
1643 | m = file->private_data; | |
c5a44a12 | 1644 | m->private = file; |
2a37a3df SR |
1645 | |
1646 | return 0; | |
981d081e SR |
1647 | } |
1648 | ||
23725aee PZ |
1649 | static ssize_t |
1650 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1651 | { | |
1a11126b | 1652 | int id = (long)event_file_data(filp); |
cd458ba9 ON |
1653 | char buf[32]; |
1654 | int len; | |
23725aee | 1655 | |
1a11126b ON |
1656 | if (unlikely(!id)) |
1657 | return -ENODEV; | |
1658 | ||
1659 | len = sprintf(buf, "%d\n", id); | |
1660 | ||
cd458ba9 | 1661 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); |
23725aee PZ |
1662 | } |
1663 | ||
7ce7e424 TZ |
1664 | static ssize_t |
1665 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1666 | loff_t *ppos) | |
1667 | { | |
7f1d2f82 | 1668 | struct trace_event_file *file; |
7ce7e424 | 1669 | struct trace_seq *s; |
e2912b09 | 1670 | int r = -ENODEV; |
7ce7e424 TZ |
1671 | |
1672 | if (*ppos) | |
1673 | return 0; | |
1674 | ||
1675 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
e2912b09 | 1676 | |
7ce7e424 TZ |
1677 | if (!s) |
1678 | return -ENOMEM; | |
1679 | ||
1680 | trace_seq_init(s); | |
1681 | ||
e2912b09 | 1682 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1683 | file = event_file_data(filp); |
1684 | if (file) | |
1685 | print_event_filter(file, s); | |
e2912b09 ON |
1686 | mutex_unlock(&event_mutex); |
1687 | ||
f306cc82 | 1688 | if (file) |
5ac48378 SRRH |
1689 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1690 | s->buffer, trace_seq_used(s)); | |
7ce7e424 TZ |
1691 | |
1692 | kfree(s); | |
1693 | ||
1694 | return r; | |
1695 | } | |
1696 | ||
1697 | static ssize_t | |
1698 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1699 | loff_t *ppos) | |
1700 | { | |
7f1d2f82 | 1701 | struct trace_event_file *file; |
8b372562 | 1702 | char *buf; |
e2912b09 | 1703 | int err = -ENODEV; |
7ce7e424 | 1704 | |
8b372562 | 1705 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
1706 | return -EINVAL; |
1707 | ||
70f6cbb6 AV |
1708 | buf = memdup_user_nul(ubuf, cnt); |
1709 | if (IS_ERR(buf)) | |
1710 | return PTR_ERR(buf); | |
7ce7e424 | 1711 | |
e2912b09 | 1712 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1713 | file = event_file_data(filp); |
1714 | if (file) | |
1715 | err = apply_event_filter(file, buf); | |
e2912b09 ON |
1716 | mutex_unlock(&event_mutex); |
1717 | ||
70f6cbb6 | 1718 | kfree(buf); |
8b372562 | 1719 | if (err < 0) |
44e9c8b7 | 1720 | return err; |
0a19e53c | 1721 | |
7ce7e424 TZ |
1722 | *ppos += cnt; |
1723 | ||
1724 | return cnt; | |
1725 | } | |
1726 | ||
e9dbfae5 SR |
1727 | static LIST_HEAD(event_subsystems); |
1728 | ||
1729 | static int subsystem_open(struct inode *inode, struct file *filp) | |
1730 | { | |
99d8ae4e JK |
1731 | struct trace_subsystem_dir *dir = NULL, *iter_dir; |
1732 | struct trace_array *tr = NULL, *iter_tr; | |
e9dbfae5 SR |
1733 | struct event_subsystem *system = NULL; |
1734 | int ret; | |
1735 | ||
d6d3523c GB |
1736 | if (tracing_is_disabled()) |
1737 | return -ENODEV; | |
1738 | ||
e9dbfae5 SR |
1739 | /* Make sure the system still exists */ |
1740 | mutex_lock(&event_mutex); | |
12ecef0c | 1741 | mutex_lock(&trace_types_lock); |
99d8ae4e JK |
1742 | list_for_each_entry(iter_tr, &ftrace_trace_arrays, list) { |
1743 | list_for_each_entry(iter_dir, &iter_tr->systems, list) { | |
1744 | if (iter_dir == inode->i_private) { | |
ae63b31e | 1745 | /* Don't open systems with no events */ |
99d8ae4e JK |
1746 | tr = iter_tr; |
1747 | dir = iter_dir; | |
ae63b31e SR |
1748 | if (dir->nr_events) { |
1749 | __get_system_dir(dir); | |
1750 | system = dir->subsystem; | |
1751 | } | |
1752 | goto exit_loop; | |
e9dbfae5 | 1753 | } |
e9dbfae5 SR |
1754 | } |
1755 | } | |
ae63b31e | 1756 | exit_loop: |
a8227415 | 1757 | mutex_unlock(&trace_types_lock); |
12ecef0c | 1758 | mutex_unlock(&event_mutex); |
e9dbfae5 | 1759 | |
ae63b31e | 1760 | if (!system) |
e9dbfae5 SR |
1761 | return -ENODEV; |
1762 | ||
8e2e2fa4 SRRH |
1763 | /* Still need to increment the ref count of the system */ |
1764 | if (trace_array_get(tr) < 0) { | |
1765 | put_system(dir); | |
1766 | return -ENODEV; | |
1767 | } | |
1768 | ||
e9dbfae5 | 1769 | ret = tracing_open_generic(inode, filp); |
8e2e2fa4 SRRH |
1770 | if (ret < 0) { |
1771 | trace_array_put(tr); | |
ae63b31e | 1772 | put_system(dir); |
8e2e2fa4 | 1773 | } |
ae63b31e SR |
1774 | |
1775 | return ret; | |
1776 | } | |
1777 | ||
1778 | static int system_tr_open(struct inode *inode, struct file *filp) | |
1779 | { | |
7967b3e0 | 1780 | struct trace_subsystem_dir *dir; |
ae63b31e SR |
1781 | struct trace_array *tr = inode->i_private; |
1782 | int ret; | |
1783 | ||
1784 | /* Make a temporary dir that has no system but points to tr */ | |
1785 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); | |
aa07d71f | 1786 | if (!dir) |
ae63b31e | 1787 | return -ENOMEM; |
ae63b31e | 1788 | |
aa07d71f | 1789 | ret = tracing_open_generic_tr(inode, filp); |
8e2e2fa4 | 1790 | if (ret < 0) { |
ae63b31e | 1791 | kfree(dir); |
d6d3523c | 1792 | return ret; |
8e2e2fa4 | 1793 | } |
aa07d71f | 1794 | dir->tr = tr; |
ae63b31e | 1795 | filp->private_data = dir; |
e9dbfae5 | 1796 | |
d6d3523c | 1797 | return 0; |
e9dbfae5 SR |
1798 | } |
1799 | ||
1800 | static int subsystem_release(struct inode *inode, struct file *file) | |
1801 | { | |
7967b3e0 | 1802 | struct trace_subsystem_dir *dir = file->private_data; |
e9dbfae5 | 1803 | |
8e2e2fa4 SRRH |
1804 | trace_array_put(dir->tr); |
1805 | ||
ae63b31e SR |
1806 | /* |
1807 | * If dir->subsystem is NULL, then this is a temporary | |
1808 | * descriptor that was made for a trace_array to enable | |
1809 | * all subsystems. | |
1810 | */ | |
1811 | if (dir->subsystem) | |
1812 | put_system(dir); | |
1813 | else | |
1814 | kfree(dir); | |
e9dbfae5 SR |
1815 | |
1816 | return 0; | |
1817 | } | |
1818 | ||
cfb180f3 TZ |
1819 | static ssize_t |
1820 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1821 | loff_t *ppos) | |
1822 | { | |
7967b3e0 | 1823 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1824 | struct event_subsystem *system = dir->subsystem; |
cfb180f3 TZ |
1825 | struct trace_seq *s; |
1826 | int r; | |
1827 | ||
1828 | if (*ppos) | |
1829 | return 0; | |
1830 | ||
1831 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1832 | if (!s) | |
1833 | return -ENOMEM; | |
1834 | ||
1835 | trace_seq_init(s); | |
1836 | ||
8b372562 | 1837 | print_subsystem_event_filter(system, s); |
5ac48378 SRRH |
1838 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1839 | s->buffer, trace_seq_used(s)); | |
cfb180f3 TZ |
1840 | |
1841 | kfree(s); | |
1842 | ||
1843 | return r; | |
1844 | } | |
1845 | ||
1846 | static ssize_t | |
1847 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1848 | loff_t *ppos) | |
1849 | { | |
7967b3e0 | 1850 | struct trace_subsystem_dir *dir = filp->private_data; |
8b372562 | 1851 | char *buf; |
cfb180f3 TZ |
1852 | int err; |
1853 | ||
8b372562 | 1854 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
1855 | return -EINVAL; |
1856 | ||
70f6cbb6 AV |
1857 | buf = memdup_user_nul(ubuf, cnt); |
1858 | if (IS_ERR(buf)) | |
1859 | return PTR_ERR(buf); | |
cfb180f3 | 1860 | |
ae63b31e | 1861 | err = apply_subsystem_event_filter(dir, buf); |
70f6cbb6 | 1862 | kfree(buf); |
8b372562 | 1863 | if (err < 0) |
44e9c8b7 | 1864 | return err; |
cfb180f3 TZ |
1865 | |
1866 | *ppos += cnt; | |
1867 | ||
1868 | return cnt; | |
1869 | } | |
1870 | ||
d1b182a8 SR |
1871 | static ssize_t |
1872 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1873 | { | |
1874 | int (*func)(struct trace_seq *s) = filp->private_data; | |
1875 | struct trace_seq *s; | |
1876 | int r; | |
1877 | ||
1878 | if (*ppos) | |
1879 | return 0; | |
1880 | ||
1881 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1882 | if (!s) | |
1883 | return -ENOMEM; | |
1884 | ||
1885 | trace_seq_init(s); | |
1886 | ||
1887 | func(s); | |
5ac48378 SRRH |
1888 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1889 | s->buffer, trace_seq_used(s)); | |
d1b182a8 SR |
1890 | |
1891 | kfree(s); | |
1892 | ||
1893 | return r; | |
1894 | } | |
1895 | ||
8ca532ad SRRH |
1896 | static void ignore_task_cpu(void *data) |
1897 | { | |
1898 | struct trace_array *tr = data; | |
1899 | struct trace_pid_list *pid_list; | |
27683626 | 1900 | struct trace_pid_list *no_pid_list; |
8ca532ad SRRH |
1901 | |
1902 | /* | |
1903 | * This function is called by on_each_cpu() while the | |
1904 | * event_mutex is held. | |
1905 | */ | |
1906 | pid_list = rcu_dereference_protected(tr->filtered_pids, | |
1907 | mutex_is_locked(&event_mutex)); | |
27683626 SRV |
1908 | no_pid_list = rcu_dereference_protected(tr->filtered_no_pids, |
1909 | mutex_is_locked(&event_mutex)); | |
8ca532ad | 1910 | |
1c5eb448 | 1911 | this_cpu_write(tr->array_buffer.data->ignore_pid, |
27683626 SRV |
1912 | trace_ignore_this_task(pid_list, no_pid_list, current)); |
1913 | } | |
1914 | ||
1915 | static void register_pid_events(struct trace_array *tr) | |
1916 | { | |
1917 | /* | |
1918 | * Register a probe that is called before all other probes | |
1919 | * to set ignore_pid if next or prev do not match. | |
1920 | * Register a probe this is called after all other probes | |
1921 | * to only keep ignore_pid set if next pid matches. | |
1922 | */ | |
1923 | register_trace_prio_sched_switch(event_filter_pid_sched_switch_probe_pre, | |
1924 | tr, INT_MAX); | |
1925 | register_trace_prio_sched_switch(event_filter_pid_sched_switch_probe_post, | |
1926 | tr, 0); | |
1927 | ||
1928 | register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_pre, | |
1929 | tr, INT_MAX); | |
1930 | register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_post, | |
1931 | tr, 0); | |
1932 | ||
1933 | register_trace_prio_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_pre, | |
1934 | tr, INT_MAX); | |
1935 | register_trace_prio_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_post, | |
1936 | tr, 0); | |
1937 | ||
1938 | register_trace_prio_sched_waking(event_filter_pid_sched_wakeup_probe_pre, | |
1939 | tr, INT_MAX); | |
1940 | register_trace_prio_sched_waking(event_filter_pid_sched_wakeup_probe_post, | |
1941 | tr, 0); | |
8ca532ad SRRH |
1942 | } |
1943 | ||
49090107 | 1944 | static ssize_t |
27683626 SRV |
1945 | event_pid_write(struct file *filp, const char __user *ubuf, |
1946 | size_t cnt, loff_t *ppos, int type) | |
49090107 | 1947 | { |
3fdaf80f | 1948 | struct seq_file *m = filp->private_data; |
49090107 SRRH |
1949 | struct trace_array *tr = m->private; |
1950 | struct trace_pid_list *filtered_pids = NULL; | |
27683626 | 1951 | struct trace_pid_list *other_pids = NULL; |
f4d34a87 | 1952 | struct trace_pid_list *pid_list; |
3fdaf80f | 1953 | struct trace_event_file *file; |
76c813e2 | 1954 | ssize_t ret; |
49090107 SRRH |
1955 | |
1956 | if (!cnt) | |
1957 | return 0; | |
1958 | ||
1959 | ret = tracing_update_buffers(); | |
1960 | if (ret < 0) | |
1961 | return ret; | |
1962 | ||
49090107 | 1963 | mutex_lock(&event_mutex); |
76c813e2 | 1964 | |
27683626 SRV |
1965 | if (type == TRACE_PIDS) { |
1966 | filtered_pids = rcu_dereference_protected(tr->filtered_pids, | |
1967 | lockdep_is_held(&event_mutex)); | |
1968 | other_pids = rcu_dereference_protected(tr->filtered_no_pids, | |
1969 | lockdep_is_held(&event_mutex)); | |
1970 | } else { | |
1971 | filtered_pids = rcu_dereference_protected(tr->filtered_no_pids, | |
1972 | lockdep_is_held(&event_mutex)); | |
1973 | other_pids = rcu_dereference_protected(tr->filtered_pids, | |
1974 | lockdep_is_held(&event_mutex)); | |
1975 | } | |
f4d34a87 | 1976 | |
76c813e2 SRRH |
1977 | ret = trace_pid_write(filtered_pids, &pid_list, ubuf, cnt); |
1978 | if (ret < 0) | |
f4d34a87 | 1979 | goto out; |
49090107 | 1980 | |
27683626 SRV |
1981 | if (type == TRACE_PIDS) |
1982 | rcu_assign_pointer(tr->filtered_pids, pid_list); | |
1983 | else | |
1984 | rcu_assign_pointer(tr->filtered_no_pids, pid_list); | |
49090107 | 1985 | |
3fdaf80f SRRH |
1986 | list_for_each_entry(file, &tr->events, list) { |
1987 | set_bit(EVENT_FILE_FL_PID_FILTER_BIT, &file->flags); | |
1988 | } | |
49090107 SRRH |
1989 | |
1990 | if (filtered_pids) { | |
e0a568dc | 1991 | tracepoint_synchronize_unregister(); |
6954e415 | 1992 | trace_pid_list_free(filtered_pids); |
27683626 SRV |
1993 | } else if (pid_list && !other_pids) { |
1994 | register_pid_events(tr); | |
49090107 SRRH |
1995 | } |
1996 | ||
799fd44c SRRH |
1997 | /* |
1998 | * Ignoring of pids is done at task switch. But we have to | |
1999 | * check for those tasks that are currently running. | |
2000 | * Always do this in case a pid was appended or removed. | |
2001 | */ | |
2002 | on_each_cpu(ignore_task_cpu, tr, 1); | |
2003 | ||
f4d34a87 | 2004 | out: |
3fdaf80f SRRH |
2005 | mutex_unlock(&event_mutex); |
2006 | ||
76c813e2 SRRH |
2007 | if (ret > 0) |
2008 | *ppos += ret; | |
49090107 SRRH |
2009 | |
2010 | return ret; | |
2011 | } | |
2012 | ||
27683626 SRV |
2013 | static ssize_t |
2014 | ftrace_event_pid_write(struct file *filp, const char __user *ubuf, | |
2015 | size_t cnt, loff_t *ppos) | |
2016 | { | |
2017 | return event_pid_write(filp, ubuf, cnt, ppos, TRACE_PIDS); | |
2018 | } | |
2019 | ||
2020 | static ssize_t | |
2021 | ftrace_event_npid_write(struct file *filp, const char __user *ubuf, | |
2022 | size_t cnt, loff_t *ppos) | |
2023 | { | |
2024 | return event_pid_write(filp, ubuf, cnt, ppos, TRACE_NO_PIDS); | |
2025 | } | |
2026 | ||
15075cac SR |
2027 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
2028 | static int ftrace_event_set_open(struct inode *inode, struct file *file); | |
49090107 | 2029 | static int ftrace_event_set_pid_open(struct inode *inode, struct file *file); |
27683626 | 2030 | static int ftrace_event_set_npid_open(struct inode *inode, struct file *file); |
f77d09a3 | 2031 | static int ftrace_event_release(struct inode *inode, struct file *file); |
15075cac | 2032 | |
b77e38aa SR |
2033 | static const struct seq_operations show_event_seq_ops = { |
2034 | .start = t_start, | |
2035 | .next = t_next, | |
2036 | .show = t_show, | |
2037 | .stop = t_stop, | |
2038 | }; | |
2039 | ||
2040 | static const struct seq_operations show_set_event_seq_ops = { | |
2041 | .start = s_start, | |
2042 | .next = s_next, | |
2043 | .show = t_show, | |
2044 | .stop = t_stop, | |
2045 | }; | |
2046 | ||
49090107 SRRH |
2047 | static const struct seq_operations show_set_pid_seq_ops = { |
2048 | .start = p_start, | |
2049 | .next = p_next, | |
5cc8976b | 2050 | .show = trace_pid_show, |
49090107 SRRH |
2051 | .stop = p_stop, |
2052 | }; | |
2053 | ||
27683626 SRV |
2054 | static const struct seq_operations show_set_no_pid_seq_ops = { |
2055 | .start = np_start, | |
2056 | .next = np_next, | |
2057 | .show = trace_pid_show, | |
2058 | .stop = p_stop, | |
2059 | }; | |
2060 | ||
2314c4ae | 2061 | static const struct file_operations ftrace_avail_fops = { |
15075cac | 2062 | .open = ftrace_event_avail_open, |
2314c4ae SR |
2063 | .read = seq_read, |
2064 | .llseek = seq_lseek, | |
2065 | .release = seq_release, | |
2066 | }; | |
2067 | ||
b77e38aa | 2068 | static const struct file_operations ftrace_set_event_fops = { |
15075cac | 2069 | .open = ftrace_event_set_open, |
b77e38aa SR |
2070 | .read = seq_read, |
2071 | .write = ftrace_event_write, | |
2072 | .llseek = seq_lseek, | |
f77d09a3 | 2073 | .release = ftrace_event_release, |
b77e38aa SR |
2074 | }; |
2075 | ||
49090107 SRRH |
2076 | static const struct file_operations ftrace_set_event_pid_fops = { |
2077 | .open = ftrace_event_set_pid_open, | |
2078 | .read = seq_read, | |
2079 | .write = ftrace_event_pid_write, | |
2080 | .llseek = seq_lseek, | |
2081 | .release = ftrace_event_release, | |
2082 | }; | |
2083 | ||
27683626 SRV |
2084 | static const struct file_operations ftrace_set_event_notrace_pid_fops = { |
2085 | .open = ftrace_event_set_npid_open, | |
2086 | .read = seq_read, | |
2087 | .write = ftrace_event_npid_write, | |
2088 | .llseek = seq_lseek, | |
2089 | .release = ftrace_event_release, | |
2090 | }; | |
2091 | ||
1473e441 | 2092 | static const struct file_operations ftrace_enable_fops = { |
f5ca233e | 2093 | .open = tracing_open_file_tr, |
1473e441 SR |
2094 | .read = event_enable_read, |
2095 | .write = event_enable_write, | |
f5ca233e | 2096 | .release = tracing_release_file_tr, |
6038f373 | 2097 | .llseek = default_llseek, |
1473e441 SR |
2098 | }; |
2099 | ||
981d081e | 2100 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
2101 | .open = trace_format_open, |
2102 | .read = seq_read, | |
2103 | .llseek = seq_lseek, | |
2104 | .release = seq_release, | |
981d081e SR |
2105 | }; |
2106 | ||
23725aee | 2107 | static const struct file_operations ftrace_event_id_fops = { |
23725aee | 2108 | .read = event_id_read, |
6038f373 | 2109 | .llseek = default_llseek, |
23725aee PZ |
2110 | }; |
2111 | ||
7ce7e424 | 2112 | static const struct file_operations ftrace_event_filter_fops = { |
f5ca233e | 2113 | .open = tracing_open_file_tr, |
7ce7e424 TZ |
2114 | .read = event_filter_read, |
2115 | .write = event_filter_write, | |
f5ca233e | 2116 | .release = tracing_release_file_tr, |
6038f373 | 2117 | .llseek = default_llseek, |
7ce7e424 TZ |
2118 | }; |
2119 | ||
cfb180f3 | 2120 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 2121 | .open = subsystem_open, |
cfb180f3 TZ |
2122 | .read = subsystem_filter_read, |
2123 | .write = subsystem_filter_write, | |
6038f373 | 2124 | .llseek = default_llseek, |
e9dbfae5 | 2125 | .release = subsystem_release, |
cfb180f3 TZ |
2126 | }; |
2127 | ||
8ae79a13 | 2128 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 2129 | .open = subsystem_open, |
8ae79a13 SR |
2130 | .read = system_enable_read, |
2131 | .write = system_enable_write, | |
6038f373 | 2132 | .llseek = default_llseek, |
40ee4dff | 2133 | .release = subsystem_release, |
8ae79a13 SR |
2134 | }; |
2135 | ||
ae63b31e SR |
2136 | static const struct file_operations ftrace_tr_enable_fops = { |
2137 | .open = system_tr_open, | |
2138 | .read = system_enable_read, | |
2139 | .write = system_enable_write, | |
2140 | .llseek = default_llseek, | |
2141 | .release = subsystem_release, | |
2142 | }; | |
2143 | ||
d1b182a8 SR |
2144 | static const struct file_operations ftrace_show_header_fops = { |
2145 | .open = tracing_open_generic, | |
2146 | .read = show_header, | |
6038f373 | 2147 | .llseek = default_llseek, |
d1b182a8 SR |
2148 | }; |
2149 | ||
ae63b31e SR |
2150 | static int |
2151 | ftrace_event_open(struct inode *inode, struct file *file, | |
2152 | const struct seq_operations *seq_ops) | |
1473e441 | 2153 | { |
ae63b31e SR |
2154 | struct seq_file *m; |
2155 | int ret; | |
1473e441 | 2156 | |
17911ff3 SRV |
2157 | ret = security_locked_down(LOCKDOWN_TRACEFS); |
2158 | if (ret) | |
2159 | return ret; | |
2160 | ||
ae63b31e SR |
2161 | ret = seq_open(file, seq_ops); |
2162 | if (ret < 0) | |
2163 | return ret; | |
2164 | m = file->private_data; | |
2165 | /* copy tr over to seq ops */ | |
2166 | m->private = inode->i_private; | |
1473e441 | 2167 | |
ae63b31e | 2168 | return ret; |
1473e441 SR |
2169 | } |
2170 | ||
f77d09a3 AL |
2171 | static int ftrace_event_release(struct inode *inode, struct file *file) |
2172 | { | |
2173 | struct trace_array *tr = inode->i_private; | |
2174 | ||
2175 | trace_array_put(tr); | |
2176 | ||
2177 | return seq_release(inode, file); | |
2178 | } | |
2179 | ||
15075cac SR |
2180 | static int |
2181 | ftrace_event_avail_open(struct inode *inode, struct file *file) | |
2182 | { | |
2183 | const struct seq_operations *seq_ops = &show_event_seq_ops; | |
2184 | ||
17911ff3 | 2185 | /* Checks for tracefs lockdown */ |
ae63b31e | 2186 | return ftrace_event_open(inode, file, seq_ops); |
15075cac SR |
2187 | } |
2188 | ||
2189 | static int | |
2190 | ftrace_event_set_open(struct inode *inode, struct file *file) | |
2191 | { | |
2192 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; | |
ae63b31e | 2193 | struct trace_array *tr = inode->i_private; |
f77d09a3 AL |
2194 | int ret; |
2195 | ||
8530dec6 SRV |
2196 | ret = tracing_check_open_get_tr(tr); |
2197 | if (ret) | |
2198 | return ret; | |
15075cac SR |
2199 | |
2200 | if ((file->f_mode & FMODE_WRITE) && | |
2201 | (file->f_flags & O_TRUNC)) | |
ae63b31e | 2202 | ftrace_clear_events(tr); |
15075cac | 2203 | |
f77d09a3 AL |
2204 | ret = ftrace_event_open(inode, file, seq_ops); |
2205 | if (ret < 0) | |
2206 | trace_array_put(tr); | |
2207 | return ret; | |
ae63b31e SR |
2208 | } |
2209 | ||
49090107 SRRH |
2210 | static int |
2211 | ftrace_event_set_pid_open(struct inode *inode, struct file *file) | |
2212 | { | |
2213 | const struct seq_operations *seq_ops = &show_set_pid_seq_ops; | |
2214 | struct trace_array *tr = inode->i_private; | |
2215 | int ret; | |
2216 | ||
8530dec6 SRV |
2217 | ret = tracing_check_open_get_tr(tr); |
2218 | if (ret) | |
2219 | return ret; | |
49090107 SRRH |
2220 | |
2221 | if ((file->f_mode & FMODE_WRITE) && | |
2222 | (file->f_flags & O_TRUNC)) | |
27683626 SRV |
2223 | ftrace_clear_event_pids(tr, TRACE_PIDS); |
2224 | ||
2225 | ret = ftrace_event_open(inode, file, seq_ops); | |
2226 | if (ret < 0) | |
2227 | trace_array_put(tr); | |
2228 | return ret; | |
2229 | } | |
2230 | ||
2231 | static int | |
2232 | ftrace_event_set_npid_open(struct inode *inode, struct file *file) | |
2233 | { | |
2234 | const struct seq_operations *seq_ops = &show_set_no_pid_seq_ops; | |
2235 | struct trace_array *tr = inode->i_private; | |
2236 | int ret; | |
2237 | ||
2238 | ret = tracing_check_open_get_tr(tr); | |
2239 | if (ret) | |
2240 | return ret; | |
2241 | ||
2242 | if ((file->f_mode & FMODE_WRITE) && | |
2243 | (file->f_flags & O_TRUNC)) | |
2244 | ftrace_clear_event_pids(tr, TRACE_NO_PIDS); | |
49090107 SRRH |
2245 | |
2246 | ret = ftrace_event_open(inode, file, seq_ops); | |
2247 | if (ret < 0) | |
2248 | trace_array_put(tr); | |
2249 | return ret; | |
2250 | } | |
2251 | ||
ae63b31e SR |
2252 | static struct event_subsystem * |
2253 | create_new_subsystem(const char *name) | |
2254 | { | |
2255 | struct event_subsystem *system; | |
2256 | ||
2257 | /* need to create new entry */ | |
2258 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
2259 | if (!system) | |
2260 | return NULL; | |
2261 | ||
2262 | system->ref_count = 1; | |
6e94a780 SR |
2263 | |
2264 | /* Only allocate if dynamic (kprobes and modules) */ | |
79ac6ef5 RV |
2265 | system->name = kstrdup_const(name, GFP_KERNEL); |
2266 | if (!system->name) | |
2267 | goto out_free; | |
ae63b31e | 2268 | |
ae63b31e SR |
2269 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
2270 | if (!system->filter) | |
2271 | goto out_free; | |
2272 | ||
2273 | list_add(&system->list, &event_subsystems); | |
2274 | ||
2275 | return system; | |
2276 | ||
2277 | out_free: | |
79ac6ef5 | 2278 | kfree_const(system->name); |
ae63b31e SR |
2279 | kfree(system); |
2280 | return NULL; | |
15075cac SR |
2281 | } |
2282 | ||
27152bce | 2283 | static struct eventfs_file * |
ae63b31e | 2284 | event_subsystem_dir(struct trace_array *tr, const char *name, |
7f1d2f82 | 2285 | struct trace_event_file *file, struct dentry *parent) |
6ecc2d1c | 2286 | { |
ba27d855 | 2287 | struct event_subsystem *system, *iter; |
7967b3e0 | 2288 | struct trace_subsystem_dir *dir; |
c8414dab | 2289 | struct eventfs_file *ef; |
27152bce | 2290 | int res; |
6ecc2d1c SR |
2291 | |
2292 | /* First see if we did not already create this dir */ | |
ae63b31e SR |
2293 | list_for_each_entry(dir, &tr->systems, list) { |
2294 | system = dir->subsystem; | |
dc82ec98 | 2295 | if (strcmp(system->name, name) == 0) { |
ae63b31e SR |
2296 | dir->nr_events++; |
2297 | file->system = dir; | |
27152bce | 2298 | return dir->ef; |
dc82ec98 | 2299 | } |
6ecc2d1c SR |
2300 | } |
2301 | ||
ae63b31e | 2302 | /* Now see if the system itself exists. */ |
ba27d855 JK |
2303 | system = NULL; |
2304 | list_for_each_entry(iter, &event_subsystems, list) { | |
2305 | if (strcmp(iter->name, name) == 0) { | |
2306 | system = iter; | |
ae63b31e | 2307 | break; |
ba27d855 | 2308 | } |
6ecc2d1c SR |
2309 | } |
2310 | ||
ae63b31e SR |
2311 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
2312 | if (!dir) | |
2313 | goto out_fail; | |
6ecc2d1c | 2314 | |
ae63b31e SR |
2315 | if (!system) { |
2316 | system = create_new_subsystem(name); | |
2317 | if (!system) | |
2318 | goto out_free; | |
2319 | } else | |
2320 | __get_system(system); | |
2321 | ||
c8414dab JR |
2322 | ef = eventfs_add_subsystem_dir(name, parent); |
2323 | if (IS_ERR(ef)) { | |
3448bac3 | 2324 | pr_warn("Failed to create system directory %s\n", name); |
ae63b31e SR |
2325 | __put_system(system); |
2326 | goto out_free; | |
6d723736 SR |
2327 | } |
2328 | ||
c8414dab | 2329 | dir->ef = ef; |
ae63b31e SR |
2330 | dir->tr = tr; |
2331 | dir->ref_count = 1; | |
2332 | dir->nr_events = 1; | |
2333 | dir->subsystem = system; | |
2334 | file->system = dir; | |
8b372562 | 2335 | |
2d396cb3 SRV |
2336 | /* the ftrace system is special, do not create enable or filter files */ |
2337 | if (strcmp(name, "ftrace") != 0) { | |
e1112b4d | 2338 | |
27152bce AK |
2339 | res = eventfs_add_file("filter", TRACE_MODE_WRITE, |
2340 | dir->ef, dir, | |
2d396cb3 | 2341 | &ftrace_subsystem_filter_fops); |
27152bce | 2342 | if (res) { |
2d396cb3 SRV |
2343 | kfree(system->filter); |
2344 | system->filter = NULL; | |
2345 | pr_warn("Could not create tracefs '%s/filter' entry\n", name); | |
2346 | } | |
e1112b4d | 2347 | |
27152bce | 2348 | eventfs_add_file("enable", TRACE_MODE_WRITE, dir->ef, dir, |
2d396cb3 SRV |
2349 | &ftrace_system_enable_fops); |
2350 | } | |
8ae79a13 | 2351 | |
ae63b31e SR |
2352 | list_add(&dir->list, &tr->systems); |
2353 | ||
27152bce | 2354 | return dir->ef; |
ae63b31e SR |
2355 | |
2356 | out_free: | |
2357 | kfree(dir); | |
2358 | out_fail: | |
2359 | /* Only print this message if failed on memory allocation */ | |
2360 | if (!dir || !system) | |
3448bac3 | 2361 | pr_warn("No memory to create event subsystem %s\n", name); |
ae63b31e | 2362 | return NULL; |
6ecc2d1c SR |
2363 | } |
2364 | ||
ac343da7 MH |
2365 | static int |
2366 | event_define_fields(struct trace_event_call *call) | |
2367 | { | |
2368 | struct list_head *head; | |
2369 | int ret = 0; | |
2370 | ||
2371 | /* | |
2372 | * Other events may have the same class. Only update | |
2373 | * the fields if they are not already defined. | |
2374 | */ | |
2375 | head = trace_get_fields(call); | |
2376 | if (list_empty(head)) { | |
2377 | struct trace_event_fields *field = call->class->fields_array; | |
2378 | unsigned int offset = sizeof(struct trace_entry); | |
2379 | ||
2380 | for (; field->type; field++) { | |
2381 | if (field->type == TRACE_FUNCTION_TYPE) { | |
2382 | field->define_fields(call); | |
2383 | break; | |
2384 | } | |
2385 | ||
2386 | offset = ALIGN(offset, field->align); | |
b6c7abd1 | 2387 | ret = trace_define_field_ext(call, field->type, field->name, |
ac343da7 | 2388 | offset, field->size, |
b6c7abd1 YS |
2389 | field->is_signed, field->filter_type, |
2390 | field->len); | |
ac343da7 MH |
2391 | if (WARN_ON_ONCE(ret)) { |
2392 | pr_err("error code is %d\n", ret); | |
2393 | break; | |
2394 | } | |
2395 | ||
2396 | offset += field->size; | |
2397 | } | |
2398 | } | |
2399 | ||
2400 | return ret; | |
2401 | } | |
2402 | ||
1473e441 | 2403 | static int |
7f1d2f82 | 2404 | event_create_dir(struct dentry *parent, struct trace_event_file *file) |
1473e441 | 2405 | { |
2425bcb9 | 2406 | struct trace_event_call *call = file->event_call; |
27152bce | 2407 | struct eventfs_file *ef_subsystem = NULL; |
ae63b31e | 2408 | struct trace_array *tr = file->tr; |
c8414dab | 2409 | struct eventfs_file *ef; |
de7b2973 | 2410 | const char *name; |
fd994989 | 2411 | int ret; |
1473e441 | 2412 | |
6ecc2d1c SR |
2413 | /* |
2414 | * If the trace point header did not define TRACE_SYSTEM | |
ee41106a SRG |
2415 | * then the system would be called "TRACE_SYSTEM". This should |
2416 | * never happen. | |
6ecc2d1c | 2417 | */ |
ee41106a SRG |
2418 | if (WARN_ON_ONCE(strcmp(call->class->system, TRACE_SYSTEM) == 0)) |
2419 | return -ENODEV; | |
2420 | ||
27152bce AK |
2421 | ef_subsystem = event_subsystem_dir(tr, call->class->system, file, parent); |
2422 | if (!ef_subsystem) | |
ee41106a | 2423 | return -ENOMEM; |
ae63b31e | 2424 | |
687fcc4a | 2425 | name = trace_event_name(call); |
c8414dab JR |
2426 | ef = eventfs_add_dir(name, ef_subsystem); |
2427 | if (IS_ERR(ef)) { | |
8434dc93 | 2428 | pr_warn("Could not create tracefs '%s' directory\n", name); |
1473e441 SR |
2429 | return -1; |
2430 | } | |
2431 | ||
c8414dab JR |
2432 | file->ef = ef; |
2433 | ||
9b63776f | 2434 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
27152bce | 2435 | eventfs_add_file("enable", TRACE_MODE_WRITE, file->ef, file, |
620a30e9 | 2436 | &ftrace_enable_fops); |
1473e441 | 2437 | |
2239291a | 2438 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 2439 | if (call->event.type && call->class->reg) |
27152bce | 2440 | eventfs_add_file("id", TRACE_MODE_READ, file->ef, |
620a30e9 ON |
2441 | (void *)(long)call->event.type, |
2442 | &ftrace_event_id_fops); | |
2239291a | 2443 | #endif |
23725aee | 2444 | |
ac343da7 MH |
2445 | ret = event_define_fields(call); |
2446 | if (ret < 0) { | |
2447 | pr_warn("Could not initialize trace point events/%s\n", name); | |
2448 | return ret; | |
cf027f64 TZ |
2449 | } |
2450 | ||
854145e0 CH |
2451 | /* |
2452 | * Only event directories that can be enabled should have | |
5d948c86 | 2453 | * triggers or filters. |
854145e0 | 2454 | */ |
5d948c86 | 2455 | if (!(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) { |
27152bce | 2456 | eventfs_add_file("filter", TRACE_MODE_WRITE, file->ef, |
21ccc9cd | 2457 | file, &ftrace_event_filter_fops); |
5d948c86 | 2458 | |
27152bce | 2459 | eventfs_add_file("trigger", TRACE_MODE_WRITE, file->ef, |
21ccc9cd | 2460 | file, &event_trigger_fops); |
5d948c86 | 2461 | } |
85f2b082 | 2462 | |
7ef224d1 | 2463 | #ifdef CONFIG_HIST_TRIGGERS |
27152bce | 2464 | eventfs_add_file("hist", TRACE_MODE_READ, file->ef, file, |
7ef224d1 | 2465 | &event_hist_fops); |
2d19bd79 TZ |
2466 | #endif |
2467 | #ifdef CONFIG_HIST_TRIGGERS_DEBUG | |
27152bce | 2468 | eventfs_add_file("hist_debug", TRACE_MODE_READ, file->ef, file, |
2d19bd79 | 2469 | &event_hist_debug_fops); |
7ef224d1 | 2470 | #endif |
27152bce | 2471 | eventfs_add_file("format", TRACE_MODE_READ, file->ef, call, |
620a30e9 | 2472 | &ftrace_event_format_fops); |
6d723736 | 2473 | |
6c3edaf9 CW |
2474 | #ifdef CONFIG_TRACE_EVENT_INJECT |
2475 | if (call->event.type && call->class->reg) | |
27152bce | 2476 | eventfs_add_file("inject", 0200, file->ef, file, |
6c3edaf9 CW |
2477 | &event_inject_fops); |
2478 | #endif | |
2479 | ||
6d723736 SR |
2480 | return 0; |
2481 | } | |
2482 | ||
2425bcb9 | 2483 | static void remove_event_from_tracers(struct trace_event_call *call) |
ae63b31e | 2484 | { |
7f1d2f82 | 2485 | struct trace_event_file *file; |
ae63b31e SR |
2486 | struct trace_array *tr; |
2487 | ||
2488 | do_for_each_event_file_safe(tr, file) { | |
ae63b31e SR |
2489 | if (file->event_call != call) |
2490 | continue; | |
2491 | ||
f6a84bdc | 2492 | remove_event_file_dir(file); |
ae63b31e SR |
2493 | /* |
2494 | * The do_for_each_event_file_safe() is | |
2495 | * a double loop. After finding the call for this | |
2496 | * trace_array, we use break to jump to the next | |
2497 | * trace_array. | |
2498 | */ | |
2499 | break; | |
2500 | } while_for_each_event_file(); | |
2501 | } | |
2502 | ||
2425bcb9 | 2503 | static void event_remove(struct trace_event_call *call) |
8781915a | 2504 | { |
ae63b31e | 2505 | struct trace_array *tr; |
7f1d2f82 | 2506 | struct trace_event_file *file; |
ae63b31e SR |
2507 | |
2508 | do_for_each_event_file(tr, file) { | |
2509 | if (file->event_call != call) | |
2510 | continue; | |
065e63f9 SRV |
2511 | |
2512 | if (file->flags & EVENT_FILE_FL_WAS_ENABLED) | |
2513 | tr->clear_trace = true; | |
2514 | ||
ae63b31e SR |
2515 | ftrace_event_enable_disable(file, 0); |
2516 | /* | |
2517 | * The do_for_each_event_file() is | |
2518 | * a double loop. After finding the call for this | |
2519 | * trace_array, we use break to jump to the next | |
2520 | * trace_array. | |
2521 | */ | |
2522 | break; | |
2523 | } while_for_each_event_file(); | |
2524 | ||
8781915a | 2525 | if (call->event.funcs) |
9023c930 | 2526 | __unregister_trace_event(&call->event); |
ae63b31e | 2527 | remove_event_from_tracers(call); |
8781915a EG |
2528 | list_del(&call->list); |
2529 | } | |
2530 | ||
2425bcb9 | 2531 | static int event_init(struct trace_event_call *call) |
8781915a EG |
2532 | { |
2533 | int ret = 0; | |
de7b2973 | 2534 | const char *name; |
8781915a | 2535 | |
687fcc4a | 2536 | name = trace_event_name(call); |
de7b2973 | 2537 | if (WARN_ON(!name)) |
8781915a EG |
2538 | return -EINVAL; |
2539 | ||
2540 | if (call->class->raw_init) { | |
2541 | ret = call->class->raw_init(call); | |
2542 | if (ret < 0 && ret != -ENOSYS) | |
3448bac3 | 2543 | pr_warn("Could not initialize trace events/%s\n", name); |
8781915a EG |
2544 | } |
2545 | ||
2546 | return ret; | |
2547 | } | |
2548 | ||
67ead0a6 | 2549 | static int |
2425bcb9 | 2550 | __register_event(struct trace_event_call *call, struct module *mod) |
bd1a5c84 | 2551 | { |
bd1a5c84 | 2552 | int ret; |
6d723736 | 2553 | |
8781915a EG |
2554 | ret = event_init(call); |
2555 | if (ret < 0) | |
2556 | return ret; | |
701970b3 | 2557 | |
ae63b31e | 2558 | list_add(&call->list, &ftrace_events); |
1d18538e SRV |
2559 | if (call->flags & TRACE_EVENT_FL_DYNAMIC) |
2560 | atomic_set(&call->refcnt, 0); | |
2561 | else | |
2562 | call->module = mod; | |
88f70d75 | 2563 | |
ae63b31e | 2564 | return 0; |
bd1a5c84 MH |
2565 | } |
2566 | ||
67ec0d85 | 2567 | static char *eval_replace(char *ptr, struct trace_eval_map *map, int len) |
0c564a53 SRRH |
2568 | { |
2569 | int rlen; | |
2570 | int elen; | |
2571 | ||
67ec0d85 | 2572 | /* Find the length of the eval value as a string */ |
00f4b652 | 2573 | elen = snprintf(ptr, 0, "%ld", map->eval_value); |
0c564a53 SRRH |
2574 | /* Make sure there's enough room to replace the string with the value */ |
2575 | if (len < elen) | |
2576 | return NULL; | |
2577 | ||
00f4b652 | 2578 | snprintf(ptr, elen + 1, "%ld", map->eval_value); |
0c564a53 SRRH |
2579 | |
2580 | /* Get the rest of the string of ptr */ | |
2581 | rlen = strlen(ptr + len); | |
2582 | memmove(ptr + elen, ptr + len, rlen); | |
2583 | /* Make sure we end the new string */ | |
2584 | ptr[elen + rlen] = 0; | |
2585 | ||
2586 | return ptr + elen; | |
2587 | } | |
2588 | ||
2425bcb9 | 2589 | static void update_event_printk(struct trace_event_call *call, |
00f4b652 | 2590 | struct trace_eval_map *map) |
0c564a53 SRRH |
2591 | { |
2592 | char *ptr; | |
2593 | int quote = 0; | |
00f4b652 | 2594 | int len = strlen(map->eval_string); |
0c564a53 SRRH |
2595 | |
2596 | for (ptr = call->print_fmt; *ptr; ptr++) { | |
2597 | if (*ptr == '\\') { | |
2598 | ptr++; | |
2599 | /* paranoid */ | |
2600 | if (!*ptr) | |
2601 | break; | |
2602 | continue; | |
2603 | } | |
2604 | if (*ptr == '"') { | |
2605 | quote ^= 1; | |
2606 | continue; | |
2607 | } | |
2608 | if (quote) | |
2609 | continue; | |
2610 | if (isdigit(*ptr)) { | |
2611 | /* skip numbers */ | |
2612 | do { | |
2613 | ptr++; | |
2614 | /* Check for alpha chars like ULL */ | |
2615 | } while (isalnum(*ptr)); | |
3193899d SRRH |
2616 | if (!*ptr) |
2617 | break; | |
0c564a53 SRRH |
2618 | /* |
2619 | * A number must have some kind of delimiter after | |
2620 | * it, and we can ignore that too. | |
2621 | */ | |
2622 | continue; | |
2623 | } | |
2624 | if (isalpha(*ptr) || *ptr == '_') { | |
00f4b652 | 2625 | if (strncmp(map->eval_string, ptr, len) == 0 && |
0c564a53 | 2626 | !isalnum(ptr[len]) && ptr[len] != '_') { |
67ec0d85 JL |
2627 | ptr = eval_replace(ptr, map, len); |
2628 | /* enum/sizeof string smaller than value */ | |
0c564a53 SRRH |
2629 | if (WARN_ON_ONCE(!ptr)) |
2630 | return; | |
2631 | /* | |
67ec0d85 | 2632 | * No need to decrement here, as eval_replace() |
0c564a53 | 2633 | * returns the pointer to the character passed |
67ec0d85 | 2634 | * the eval, and two evals can not be placed |
0c564a53 SRRH |
2635 | * back to back without something in between. |
2636 | * We can skip that something in between. | |
2637 | */ | |
2638 | continue; | |
2639 | } | |
2640 | skip_more: | |
2641 | do { | |
2642 | ptr++; | |
2643 | } while (isalnum(*ptr) || *ptr == '_'); | |
3193899d SRRH |
2644 | if (!*ptr) |
2645 | break; | |
0c564a53 SRRH |
2646 | /* |
2647 | * If what comes after this variable is a '.' or | |
2648 | * '->' then we can continue to ignore that string. | |
2649 | */ | |
2650 | if (*ptr == '.' || (ptr[0] == '-' && ptr[1] == '>')) { | |
2651 | ptr += *ptr == '.' ? 1 : 2; | |
3193899d SRRH |
2652 | if (!*ptr) |
2653 | break; | |
0c564a53 SRRH |
2654 | goto skip_more; |
2655 | } | |
2656 | /* | |
2657 | * Once again, we can skip the delimiter that came | |
2658 | * after the string. | |
2659 | */ | |
2660 | continue; | |
2661 | } | |
2662 | } | |
2663 | } | |
2664 | ||
795301d3 SRG |
2665 | static void add_str_to_module(struct module *module, char *str) |
2666 | { | |
2667 | struct module_string *modstr; | |
2668 | ||
2669 | modstr = kmalloc(sizeof(*modstr), GFP_KERNEL); | |
2670 | ||
2671 | /* | |
2672 | * If we failed to allocate memory here, then we'll just | |
2673 | * let the str memory leak when the module is removed. | |
2674 | * If this fails to allocate, there's worse problems than | |
2675 | * a leaked string on module removal. | |
2676 | */ | |
2677 | if (WARN_ON_ONCE(!modstr)) | |
2678 | return; | |
2679 | ||
2680 | modstr->module = module; | |
2681 | modstr->str = str; | |
2682 | ||
2683 | list_add(&modstr->next, &module_strings); | |
2684 | } | |
2685 | ||
b3bc8547 SRG |
2686 | static void update_event_fields(struct trace_event_call *call, |
2687 | struct trace_eval_map *map) | |
2688 | { | |
2689 | struct ftrace_event_field *field; | |
2690 | struct list_head *head; | |
2691 | char *ptr; | |
795301d3 | 2692 | char *str; |
b3bc8547 SRG |
2693 | int len = strlen(map->eval_string); |
2694 | ||
795301d3 SRG |
2695 | /* Dynamic events should never have field maps */ |
2696 | if (WARN_ON_ONCE(call->flags & TRACE_EVENT_FL_DYNAMIC)) | |
2697 | return; | |
2698 | ||
b3bc8547 SRG |
2699 | head = trace_get_fields(call); |
2700 | list_for_each_entry(field, head, link) { | |
2701 | ptr = strchr(field->type, '['); | |
2702 | if (!ptr) | |
2703 | continue; | |
2704 | ptr++; | |
2705 | ||
2706 | if (!isalpha(*ptr) && *ptr != '_') | |
2707 | continue; | |
2708 | ||
2709 | if (strncmp(map->eval_string, ptr, len) != 0) | |
2710 | continue; | |
2711 | ||
795301d3 SRG |
2712 | str = kstrdup(field->type, GFP_KERNEL); |
2713 | if (WARN_ON_ONCE(!str)) | |
2714 | return; | |
2715 | ptr = str + (ptr - field->type); | |
b3bc8547 SRG |
2716 | ptr = eval_replace(ptr, map, len); |
2717 | /* enum/sizeof string smaller than value */ | |
795301d3 SRG |
2718 | if (WARN_ON_ONCE(!ptr)) { |
2719 | kfree(str); | |
2720 | continue; | |
2721 | } | |
2722 | ||
2723 | /* | |
2724 | * If the event is part of a module, then we need to free the string | |
2725 | * when the module is removed. Otherwise, it will stay allocated | |
2726 | * until a reboot. | |
2727 | */ | |
2728 | if (call->module) | |
2729 | add_str_to_module(call->module, str); | |
2730 | ||
2731 | field->type = str; | |
b3bc8547 SRG |
2732 | } |
2733 | } | |
2734 | ||
f57a4143 | 2735 | void trace_event_eval_update(struct trace_eval_map **map, int len) |
0c564a53 | 2736 | { |
2425bcb9 | 2737 | struct trace_event_call *call, *p; |
0c564a53 | 2738 | const char *last_system = NULL; |
1ebe1eaf | 2739 | bool first = false; |
0c564a53 SRRH |
2740 | int last_i; |
2741 | int i; | |
2742 | ||
2743 | down_write(&trace_event_sem); | |
2744 | list_for_each_entry_safe(call, p, &ftrace_events, list) { | |
2745 | /* events are usually grouped together with systems */ | |
2746 | if (!last_system || call->class->system != last_system) { | |
1ebe1eaf | 2747 | first = true; |
0c564a53 SRRH |
2748 | last_i = 0; |
2749 | last_system = call->class->system; | |
2750 | } | |
2751 | ||
1ebe1eaf | 2752 | /* |
f2cc020d | 2753 | * Since calls are grouped by systems, the likelihood that the |
1ebe1eaf | 2754 | * next call in the iteration belongs to the same system as the |
2b5894cc | 2755 | * previous call is high. As an optimization, we skip searching |
1ebe1eaf SRV |
2756 | * for a map[] that matches the call's system if the last call |
2757 | * was from the same system. That's what last_i is for. If the | |
2758 | * call has the same system as the previous call, then last_i | |
2759 | * will be the index of the first map[] that has a matching | |
2760 | * system. | |
2761 | */ | |
0c564a53 SRRH |
2762 | for (i = last_i; i < len; i++) { |
2763 | if (call->class->system == map[i]->system) { | |
2764 | /* Save the first system if need be */ | |
1ebe1eaf | 2765 | if (first) { |
0c564a53 | 2766 | last_i = i; |
1ebe1eaf SRV |
2767 | first = false; |
2768 | } | |
0c564a53 | 2769 | update_event_printk(call, map[i]); |
b3bc8547 | 2770 | update_event_fields(call, map[i]); |
0c564a53 SRRH |
2771 | } |
2772 | } | |
23cce5f2 | 2773 | cond_resched(); |
0c564a53 SRRH |
2774 | } |
2775 | up_write(&trace_event_sem); | |
2776 | } | |
2777 | ||
7f1d2f82 | 2778 | static struct trace_event_file * |
2425bcb9 | 2779 | trace_create_new_event(struct trace_event_call *call, |
da511bf3 SRRH |
2780 | struct trace_array *tr) |
2781 | { | |
6cb20650 SRV |
2782 | struct trace_pid_list *no_pid_list; |
2783 | struct trace_pid_list *pid_list; | |
7f1d2f82 | 2784 | struct trace_event_file *file; |
6cb20650 | 2785 | unsigned int first; |
da511bf3 SRRH |
2786 | |
2787 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); | |
2788 | if (!file) | |
2789 | return NULL; | |
2790 | ||
6cb20650 SRV |
2791 | pid_list = rcu_dereference_protected(tr->filtered_pids, |
2792 | lockdep_is_held(&event_mutex)); | |
2793 | no_pid_list = rcu_dereference_protected(tr->filtered_no_pids, | |
2794 | lockdep_is_held(&event_mutex)); | |
2795 | ||
2796 | if (!trace_pid_list_first(pid_list, &first) || | |
27ff768f | 2797 | !trace_pid_list_first(no_pid_list, &first)) |
6cb20650 SRV |
2798 | file->flags |= EVENT_FILE_FL_PID_FILTER; |
2799 | ||
da511bf3 SRRH |
2800 | file->event_call = call; |
2801 | file->tr = tr; | |
2802 | atomic_set(&file->sm_ref, 0); | |
85f2b082 TZ |
2803 | atomic_set(&file->tm_ref, 0); |
2804 | INIT_LIST_HEAD(&file->triggers); | |
da511bf3 SRRH |
2805 | list_add(&file->list, &tr->events); |
2806 | ||
2807 | return file; | |
2808 | } | |
2809 | ||
a01fdc89 SRG |
2810 | #define MAX_BOOT_TRIGGERS 32 |
2811 | ||
2812 | static struct boot_triggers { | |
2813 | const char *event; | |
2814 | char *trigger; | |
2815 | } bootup_triggers[MAX_BOOT_TRIGGERS]; | |
2816 | ||
2817 | static char bootup_trigger_buf[COMMAND_LINE_SIZE]; | |
2818 | static int nr_boot_triggers; | |
2819 | ||
2820 | static __init int setup_trace_triggers(char *str) | |
2821 | { | |
2822 | char *trigger; | |
2823 | char *buf; | |
2824 | int i; | |
2825 | ||
c7dce4c5 | 2826 | strscpy(bootup_trigger_buf, str, COMMAND_LINE_SIZE); |
a01fdc89 SRG |
2827 | ring_buffer_expanded = true; |
2828 | disable_tracing_selftest("running event triggers"); | |
2829 | ||
2830 | buf = bootup_trigger_buf; | |
2831 | for (i = 0; i < MAX_BOOT_TRIGGERS; i++) { | |
2832 | trigger = strsep(&buf, ","); | |
2833 | if (!trigger) | |
2834 | break; | |
2835 | bootup_triggers[i].event = strsep(&trigger, "."); | |
e6745a4d | 2836 | bootup_triggers[i].trigger = trigger; |
a01fdc89 SRG |
2837 | if (!bootup_triggers[i].trigger) |
2838 | break; | |
2839 | } | |
2840 | ||
2841 | nr_boot_triggers = i; | |
2842 | return 1; | |
2843 | } | |
2844 | __setup("trace_trigger=", setup_trace_triggers); | |
a01fdc89 | 2845 | |
ae63b31e SR |
2846 | /* Add an event to a trace directory */ |
2847 | static int | |
2425bcb9 | 2848 | __trace_add_new_event(struct trace_event_call *call, struct trace_array *tr) |
ae63b31e | 2849 | { |
7f1d2f82 | 2850 | struct trace_event_file *file; |
ae63b31e | 2851 | |
da511bf3 | 2852 | file = trace_create_new_event(call, tr); |
ae63b31e SR |
2853 | if (!file) |
2854 | return -ENOMEM; | |
2855 | ||
a838deab MH |
2856 | if (eventdir_initialized) |
2857 | return event_create_dir(tr->event_dir, file); | |
2858 | else | |
2859 | return event_define_fields(call); | |
ae63b31e SR |
2860 | } |
2861 | ||
a01fdc89 SRG |
2862 | static void trace_early_triggers(struct trace_event_file *file, const char *name) |
2863 | { | |
2864 | int ret; | |
2865 | int i; | |
2866 | ||
2867 | for (i = 0; i < nr_boot_triggers; i++) { | |
2868 | if (strcmp(name, bootup_triggers[i].event)) | |
2869 | continue; | |
2870 | mutex_lock(&event_mutex); | |
2871 | ret = trigger_process_regex(file, bootup_triggers[i].trigger); | |
2872 | mutex_unlock(&event_mutex); | |
2873 | if (ret) | |
2874 | pr_err("Failed to register trigger '%s' on event %s\n", | |
2875 | bootup_triggers[i].trigger, | |
2876 | bootup_triggers[i].event); | |
2877 | } | |
2878 | } | |
a01fdc89 | 2879 | |
77248221 | 2880 | /* |
f2cc020d | 2881 | * Just create a descriptor for early init. A descriptor is required |
77248221 SR |
2882 | * for enabling events at boot. We want to enable events before |
2883 | * the filesystem is initialized. | |
2884 | */ | |
ce66f613 | 2885 | static int |
2425bcb9 | 2886 | __trace_early_add_new_event(struct trace_event_call *call, |
77248221 SR |
2887 | struct trace_array *tr) |
2888 | { | |
7f1d2f82 | 2889 | struct trace_event_file *file; |
a01fdc89 | 2890 | int ret; |
77248221 | 2891 | |
da511bf3 | 2892 | file = trace_create_new_event(call, tr); |
77248221 SR |
2893 | if (!file) |
2894 | return -ENOMEM; | |
2895 | ||
a01fdc89 SRG |
2896 | ret = event_define_fields(call); |
2897 | if (ret) | |
2898 | return ret; | |
2899 | ||
2900 | trace_early_triggers(file, trace_event_name(call)); | |
2901 | ||
2902 | return 0; | |
77248221 SR |
2903 | } |
2904 | ||
ae63b31e | 2905 | struct ftrace_module_file_ops; |
2425bcb9 | 2906 | static void __add_event_to_tracers(struct trace_event_call *call); |
ae63b31e | 2907 | |
7e1413ed SRV |
2908 | /* Add an additional event_call dynamically */ |
2909 | int trace_add_event_call(struct trace_event_call *call) | |
bd1a5c84 MH |
2910 | { |
2911 | int ret; | |
fc800a10 MH |
2912 | lockdep_assert_held(&event_mutex); |
2913 | ||
12ecef0c | 2914 | mutex_lock(&trace_types_lock); |
701970b3 | 2915 | |
ae63b31e SR |
2916 | ret = __register_event(call, NULL); |
2917 | if (ret >= 0) | |
779c5e37 | 2918 | __add_event_to_tracers(call); |
a2ca5e03 | 2919 | |
a8227415 | 2920 | mutex_unlock(&trace_types_lock); |
fc800a10 MH |
2921 | return ret; |
2922 | } | |
8bcd0663 | 2923 | EXPORT_SYMBOL_GPL(trace_add_event_call); |
fc800a10 | 2924 | |
4fead8e4 | 2925 | /* |
a8227415 AL |
2926 | * Must be called under locking of trace_types_lock, event_mutex and |
2927 | * trace_event_sem. | |
4fead8e4 | 2928 | */ |
2425bcb9 | 2929 | static void __trace_remove_event_call(struct trace_event_call *call) |
bd1a5c84 | 2930 | { |
8781915a | 2931 | event_remove(call); |
bd1a5c84 | 2932 | trace_destroy_fields(call); |
57375747 ON |
2933 | free_event_filter(call->filter); |
2934 | call->filter = NULL; | |
bd1a5c84 MH |
2935 | } |
2936 | ||
2425bcb9 | 2937 | static int probe_remove_event_call(struct trace_event_call *call) |
2816c551 ON |
2938 | { |
2939 | struct trace_array *tr; | |
7f1d2f82 | 2940 | struct trace_event_file *file; |
2816c551 ON |
2941 | |
2942 | #ifdef CONFIG_PERF_EVENTS | |
2943 | if (call->perf_refcount) | |
2944 | return -EBUSY; | |
2945 | #endif | |
2946 | do_for_each_event_file(tr, file) { | |
2947 | if (file->event_call != call) | |
2948 | continue; | |
2949 | /* | |
2950 | * We can't rely on ftrace_event_enable_disable(enable => 0) | |
5d6ad960 | 2951 | * we are going to do, EVENT_FILE_FL_SOFT_MODE can suppress |
2816c551 ON |
2952 | * TRACE_REG_UNREGISTER. |
2953 | */ | |
5d6ad960 | 2954 | if (file->flags & EVENT_FILE_FL_ENABLED) |
4313e5a6 SRG |
2955 | goto busy; |
2956 | ||
2957 | if (file->flags & EVENT_FILE_FL_WAS_ENABLED) | |
2958 | tr->clear_trace = true; | |
2ba64035 SRRH |
2959 | /* |
2960 | * The do_for_each_event_file_safe() is | |
2961 | * a double loop. After finding the call for this | |
2962 | * trace_array, we use break to jump to the next | |
2963 | * trace_array. | |
2964 | */ | |
2816c551 ON |
2965 | break; |
2966 | } while_for_each_event_file(); | |
2967 | ||
2968 | __trace_remove_event_call(call); | |
2969 | ||
2970 | return 0; | |
4313e5a6 SRG |
2971 | busy: |
2972 | /* No need to clear the trace now */ | |
2973 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
2974 | tr->clear_trace = false; | |
2975 | } | |
2976 | return -EBUSY; | |
2816c551 ON |
2977 | } |
2978 | ||
7e1413ed SRV |
2979 | /* Remove an event_call */ |
2980 | int trace_remove_event_call(struct trace_event_call *call) | |
bd1a5c84 | 2981 | { |
2816c551 ON |
2982 | int ret; |
2983 | ||
fc800a10 MH |
2984 | lockdep_assert_held(&event_mutex); |
2985 | ||
12ecef0c | 2986 | mutex_lock(&trace_types_lock); |
52f6ad6d | 2987 | down_write(&trace_event_sem); |
2816c551 | 2988 | ret = probe_remove_event_call(call); |
52f6ad6d | 2989 | up_write(&trace_event_sem); |
a8227415 | 2990 | mutex_unlock(&trace_types_lock); |
fc800a10 MH |
2991 | |
2992 | return ret; | |
2993 | } | |
8bcd0663 | 2994 | EXPORT_SYMBOL_GPL(trace_remove_event_call); |
fc800a10 | 2995 | |
bd1a5c84 MH |
2996 | #define for_each_event(event, start, end) \ |
2997 | for (event = start; \ | |
2998 | (unsigned long)event < (unsigned long)end; \ | |
2999 | event++) | |
3000 | ||
3001 | #ifdef CONFIG_MODULES | |
3002 | ||
6d723736 SR |
3003 | static void trace_module_add_events(struct module *mod) |
3004 | { | |
2425bcb9 | 3005 | struct trace_event_call **call, **start, **end; |
6d723736 | 3006 | |
45ab2813 SRRH |
3007 | if (!mod->num_trace_events) |
3008 | return; | |
3009 | ||
3010 | /* Don't add infrastructure for mods without tracepoints */ | |
3011 | if (trace_module_has_bad_taint(mod)) { | |
3012 | pr_err("%s: module has bad taint, not creating trace events\n", | |
3013 | mod->name); | |
3014 | return; | |
3015 | } | |
3016 | ||
6d723736 SR |
3017 | start = mod->trace_events; |
3018 | end = mod->trace_events + mod->num_trace_events; | |
3019 | ||
6d723736 | 3020 | for_each_event(call, start, end) { |
ae63b31e | 3021 | __register_event(*call, mod); |
779c5e37 | 3022 | __add_event_to_tracers(*call); |
6d723736 SR |
3023 | } |
3024 | } | |
3025 | ||
3026 | static void trace_module_remove_events(struct module *mod) | |
3027 | { | |
2425bcb9 | 3028 | struct trace_event_call *call, *p; |
795301d3 | 3029 | struct module_string *modstr, *m; |
6d723736 | 3030 | |
52f6ad6d | 3031 | down_write(&trace_event_sem); |
6d723736 | 3032 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1d18538e SRV |
3033 | if ((call->flags & TRACE_EVENT_FL_DYNAMIC) || !call->module) |
3034 | continue; | |
3035 | if (call->module == mod) | |
bd1a5c84 | 3036 | __trace_remove_event_call(call); |
6d723736 | 3037 | } |
795301d3 SRG |
3038 | /* Check for any strings allocade for this module */ |
3039 | list_for_each_entry_safe(modstr, m, &module_strings, next) { | |
3040 | if (modstr->module != mod) | |
3041 | continue; | |
3042 | list_del(&modstr->next); | |
3043 | kfree(modstr->str); | |
3044 | kfree(modstr); | |
3045 | } | |
52f6ad6d | 3046 | up_write(&trace_event_sem); |
9456f0fa SR |
3047 | |
3048 | /* | |
3049 | * It is safest to reset the ring buffer if the module being unloaded | |
873c642f SRRH |
3050 | * registered any events that were used. The only worry is if |
3051 | * a new module gets loaded, and takes on the same id as the events | |
3052 | * of this module. When printing out the buffer, traced events left | |
3053 | * over from this module may be passed to the new module events and | |
3054 | * unexpected results may occur. | |
9456f0fa | 3055 | */ |
e18eb878 | 3056 | tracing_reset_all_online_cpus_unlocked(); |
6d723736 SR |
3057 | } |
3058 | ||
61f919a1 SR |
3059 | static int trace_module_notify(struct notifier_block *self, |
3060 | unsigned long val, void *data) | |
6d723736 SR |
3061 | { |
3062 | struct module *mod = data; | |
3063 | ||
3064 | mutex_lock(&event_mutex); | |
12ecef0c | 3065 | mutex_lock(&trace_types_lock); |
6d723736 SR |
3066 | switch (val) { |
3067 | case MODULE_STATE_COMING: | |
3068 | trace_module_add_events(mod); | |
3069 | break; | |
3070 | case MODULE_STATE_GOING: | |
3071 | trace_module_remove_events(mod); | |
3072 | break; | |
3073 | } | |
a8227415 | 3074 | mutex_unlock(&trace_types_lock); |
12ecef0c | 3075 | mutex_unlock(&event_mutex); |
fd994989 | 3076 | |
0340a6b7 | 3077 | return NOTIFY_OK; |
1473e441 | 3078 | } |
315326c1 | 3079 | |
836d481e ON |
3080 | static struct notifier_block trace_module_nb = { |
3081 | .notifier_call = trace_module_notify, | |
3673b8e4 | 3082 | .priority = 1, /* higher than trace.c module notify */ |
836d481e | 3083 | }; |
61f919a1 | 3084 | #endif /* CONFIG_MODULES */ |
1473e441 | 3085 | |
ae63b31e SR |
3086 | /* Create a new event directory structure for a trace directory. */ |
3087 | static void | |
3088 | __trace_add_event_dirs(struct trace_array *tr) | |
3089 | { | |
2425bcb9 | 3090 | struct trace_event_call *call; |
ae63b31e SR |
3091 | int ret; |
3092 | ||
3093 | list_for_each_entry(call, &ftrace_events, list) { | |
620a30e9 | 3094 | ret = __trace_add_new_event(call, tr); |
ae63b31e | 3095 | if (ret < 0) |
3448bac3 | 3096 | pr_warn("Could not create directory for event %s\n", |
687fcc4a | 3097 | trace_event_name(call)); |
ae63b31e SR |
3098 | } |
3099 | } | |
3100 | ||
3c96529c | 3101 | /* Returns any file that matches the system and event */ |
7f1d2f82 | 3102 | struct trace_event_file * |
3c96529c | 3103 | __find_event_file(struct trace_array *tr, const char *system, const char *event) |
3cd715de | 3104 | { |
7f1d2f82 | 3105 | struct trace_event_file *file; |
2425bcb9 | 3106 | struct trace_event_call *call; |
de7b2973 | 3107 | const char *name; |
3cd715de SRRH |
3108 | |
3109 | list_for_each_entry(file, &tr->events, list) { | |
3110 | ||
3111 | call = file->event_call; | |
687fcc4a | 3112 | name = trace_event_name(call); |
3cd715de | 3113 | |
3c96529c | 3114 | if (!name || !call->class) |
3cd715de SRRH |
3115 | continue; |
3116 | ||
de7b2973 | 3117 | if (strcmp(event, name) == 0 && |
3cd715de SRRH |
3118 | strcmp(system, call->class->system) == 0) |
3119 | return file; | |
3120 | } | |
3121 | return NULL; | |
3122 | } | |
3123 | ||
3c96529c SRV |
3124 | /* Returns valid trace event files that match system and event */ |
3125 | struct trace_event_file * | |
3126 | find_event_file(struct trace_array *tr, const char *system, const char *event) | |
3127 | { | |
3128 | struct trace_event_file *file; | |
3129 | ||
3130 | file = __find_event_file(tr, system, event); | |
3131 | if (!file || !file->event_call->class->reg || | |
3132 | file->event_call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) | |
3133 | return NULL; | |
3134 | ||
3135 | return file; | |
3136 | } | |
3137 | ||
e3e2a2cc TZ |
3138 | /** |
3139 | * trace_get_event_file - Find and return a trace event file | |
3140 | * @instance: The name of the trace instance containing the event | |
3141 | * @system: The name of the system containing the event | |
3142 | * @event: The name of the event | |
3143 | * | |
3144 | * Return a trace event file given the trace instance name, trace | |
3145 | * system, and trace event name. If the instance name is NULL, it | |
3146 | * refers to the top-level trace array. | |
3147 | * | |
3148 | * This function will look it up and return it if found, after calling | |
3149 | * trace_array_get() to prevent the instance from going away, and | |
3150 | * increment the event's module refcount to prevent it from being | |
3151 | * removed. | |
3152 | * | |
3153 | * To release the file, call trace_put_event_file(), which will call | |
3154 | * trace_array_put() and decrement the event's module refcount. | |
3155 | * | |
3156 | * Return: The trace event on success, ERR_PTR otherwise. | |
3157 | */ | |
3158 | struct trace_event_file *trace_get_event_file(const char *instance, | |
3159 | const char *system, | |
3160 | const char *event) | |
3161 | { | |
3162 | struct trace_array *tr = top_trace_array(); | |
3163 | struct trace_event_file *file = NULL; | |
3164 | int ret = -EINVAL; | |
3165 | ||
3166 | if (instance) { | |
3167 | tr = trace_array_find_get(instance); | |
3168 | if (!tr) | |
3169 | return ERR_PTR(-ENOENT); | |
3170 | } else { | |
3171 | ret = trace_array_get(tr); | |
3172 | if (ret) | |
3173 | return ERR_PTR(ret); | |
3174 | } | |
3175 | ||
3176 | mutex_lock(&event_mutex); | |
3177 | ||
3178 | file = find_event_file(tr, system, event); | |
3179 | if (!file) { | |
3180 | trace_array_put(tr); | |
3181 | ret = -EINVAL; | |
3182 | goto out; | |
3183 | } | |
3184 | ||
3185 | /* Don't let event modules unload while in use */ | |
1d18538e | 3186 | ret = trace_event_try_get_ref(file->event_call); |
e3e2a2cc TZ |
3187 | if (!ret) { |
3188 | trace_array_put(tr); | |
3189 | ret = -EBUSY; | |
3190 | goto out; | |
3191 | } | |
3192 | ||
3193 | ret = 0; | |
3194 | out: | |
3195 | mutex_unlock(&event_mutex); | |
3196 | ||
3197 | if (ret) | |
3198 | file = ERR_PTR(ret); | |
3199 | ||
3200 | return file; | |
3201 | } | |
3202 | EXPORT_SYMBOL_GPL(trace_get_event_file); | |
3203 | ||
3204 | /** | |
3205 | * trace_put_event_file - Release a file from trace_get_event_file() | |
3206 | * @file: The trace event file | |
3207 | * | |
3208 | * If a file was retrieved using trace_get_event_file(), this should | |
3209 | * be called when it's no longer needed. It will cancel the previous | |
3210 | * trace_array_get() called by that function, and decrement the | |
3211 | * event's module refcount. | |
3212 | */ | |
3213 | void trace_put_event_file(struct trace_event_file *file) | |
3214 | { | |
3215 | mutex_lock(&event_mutex); | |
1d18538e | 3216 | trace_event_put_ref(file->event_call); |
e3e2a2cc TZ |
3217 | mutex_unlock(&event_mutex); |
3218 | ||
3219 | trace_array_put(file->tr); | |
3220 | } | |
3221 | EXPORT_SYMBOL_GPL(trace_put_event_file); | |
3222 | ||
2875a08b SRRH |
3223 | #ifdef CONFIG_DYNAMIC_FTRACE |
3224 | ||
3225 | /* Avoid typos */ | |
3226 | #define ENABLE_EVENT_STR "enable_event" | |
3227 | #define DISABLE_EVENT_STR "disable_event" | |
3228 | ||
3229 | struct event_probe_data { | |
7f1d2f82 | 3230 | struct trace_event_file *file; |
2875a08b SRRH |
3231 | unsigned long count; |
3232 | int ref; | |
3233 | bool enable; | |
3234 | }; | |
3235 | ||
41794f19 SRV |
3236 | static void update_event_probe(struct event_probe_data *data) |
3237 | { | |
3238 | if (data->enable) | |
3239 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); | |
3240 | else | |
3241 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); | |
3242 | } | |
3243 | ||
3cd715de | 3244 | static void |
bca6c8d0 | 3245 | event_enable_probe(unsigned long ip, unsigned long parent_ip, |
b5f081b5 | 3246 | struct trace_array *tr, struct ftrace_probe_ops *ops, |
6e444319 | 3247 | void *data) |
3cd715de | 3248 | { |
6e444319 SRV |
3249 | struct ftrace_func_mapper *mapper = data; |
3250 | struct event_probe_data *edata; | |
41794f19 | 3251 | void **pdata; |
3cd715de | 3252 | |
41794f19 SRV |
3253 | pdata = ftrace_func_mapper_find_ip(mapper, ip); |
3254 | if (!pdata || !*pdata) | |
3cd715de SRRH |
3255 | return; |
3256 | ||
6e444319 SRV |
3257 | edata = *pdata; |
3258 | update_event_probe(edata); | |
3cd715de SRRH |
3259 | } |
3260 | ||
3261 | static void | |
bca6c8d0 | 3262 | event_enable_count_probe(unsigned long ip, unsigned long parent_ip, |
b5f081b5 | 3263 | struct trace_array *tr, struct ftrace_probe_ops *ops, |
6e444319 | 3264 | void *data) |
3cd715de | 3265 | { |
6e444319 SRV |
3266 | struct ftrace_func_mapper *mapper = data; |
3267 | struct event_probe_data *edata; | |
41794f19 | 3268 | void **pdata; |
3cd715de | 3269 | |
41794f19 SRV |
3270 | pdata = ftrace_func_mapper_find_ip(mapper, ip); |
3271 | if (!pdata || !*pdata) | |
3cd715de SRRH |
3272 | return; |
3273 | ||
6e444319 | 3274 | edata = *pdata; |
41794f19 | 3275 | |
6e444319 | 3276 | if (!edata->count) |
3cd715de SRRH |
3277 | return; |
3278 | ||
3279 | /* Skip if the event is in a state we want to switch to */ | |
6e444319 | 3280 | if (edata->enable == !(edata->file->flags & EVENT_FILE_FL_SOFT_DISABLED)) |
3cd715de SRRH |
3281 | return; |
3282 | ||
6e444319 SRV |
3283 | if (edata->count != -1) |
3284 | (edata->count)--; | |
3cd715de | 3285 | |
6e444319 | 3286 | update_event_probe(edata); |
3cd715de SRRH |
3287 | } |
3288 | ||
3289 | static int | |
3290 | event_enable_print(struct seq_file *m, unsigned long ip, | |
6e444319 | 3291 | struct ftrace_probe_ops *ops, void *data) |
3cd715de | 3292 | { |
6e444319 SRV |
3293 | struct ftrace_func_mapper *mapper = data; |
3294 | struct event_probe_data *edata; | |
41794f19 SRV |
3295 | void **pdata; |
3296 | ||
3297 | pdata = ftrace_func_mapper_find_ip(mapper, ip); | |
3298 | ||
3299 | if (WARN_ON_ONCE(!pdata || !*pdata)) | |
3300 | return 0; | |
3301 | ||
6e444319 | 3302 | edata = *pdata; |
3cd715de SRRH |
3303 | |
3304 | seq_printf(m, "%ps:", (void *)ip); | |
3305 | ||
3306 | seq_printf(m, "%s:%s:%s", | |
6e444319 SRV |
3307 | edata->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR, |
3308 | edata->file->event_call->class->system, | |
3309 | trace_event_name(edata->file->event_call)); | |
3cd715de | 3310 | |
6e444319 | 3311 | if (edata->count == -1) |
fa6f0cc7 | 3312 | seq_puts(m, ":unlimited\n"); |
3cd715de | 3313 | else |
6e444319 | 3314 | seq_printf(m, ":count=%ld\n", edata->count); |
3cd715de SRRH |
3315 | |
3316 | return 0; | |
3317 | } | |
3318 | ||
3319 | static int | |
b5f081b5 | 3320 | event_enable_init(struct ftrace_probe_ops *ops, struct trace_array *tr, |
6e444319 | 3321 | unsigned long ip, void *init_data, void **data) |
3cd715de | 3322 | { |
6e444319 SRV |
3323 | struct ftrace_func_mapper *mapper = *data; |
3324 | struct event_probe_data *edata = init_data; | |
41794f19 SRV |
3325 | int ret; |
3326 | ||
6e444319 SRV |
3327 | if (!mapper) { |
3328 | mapper = allocate_ftrace_func_mapper(); | |
3329 | if (!mapper) | |
3330 | return -ENODEV; | |
3331 | *data = mapper; | |
3332 | } | |
3333 | ||
3334 | ret = ftrace_func_mapper_add_ip(mapper, ip, edata); | |
41794f19 SRV |
3335 | if (ret < 0) |
3336 | return ret; | |
3cd715de | 3337 | |
6e444319 SRV |
3338 | edata->ref++; |
3339 | ||
3340 | return 0; | |
3341 | } | |
3342 | ||
3343 | static int free_probe_data(void *data) | |
3344 | { | |
3345 | struct event_probe_data *edata = data; | |
41794f19 | 3346 | |
6e444319 SRV |
3347 | edata->ref--; |
3348 | if (!edata->ref) { | |
3349 | /* Remove the SOFT_MODE flag */ | |
3350 | __ftrace_event_enable_disable(edata->file, 0, 1); | |
1d18538e | 3351 | trace_event_put_ref(edata->file->event_call); |
6e444319 SRV |
3352 | kfree(edata); |
3353 | } | |
3cd715de SRRH |
3354 | return 0; |
3355 | } | |
3356 | ||
3357 | static void | |
b5f081b5 | 3358 | event_enable_free(struct ftrace_probe_ops *ops, struct trace_array *tr, |
6e444319 | 3359 | unsigned long ip, void *data) |
3cd715de | 3360 | { |
6e444319 SRV |
3361 | struct ftrace_func_mapper *mapper = data; |
3362 | struct event_probe_data *edata; | |
3363 | ||
3364 | if (!ip) { | |
3365 | if (!mapper) | |
3366 | return; | |
3367 | free_ftrace_func_mapper(mapper, free_probe_data); | |
3368 | return; | |
3369 | } | |
41794f19 | 3370 | |
6e444319 | 3371 | edata = ftrace_func_mapper_remove_ip(mapper, ip); |
41794f19 | 3372 | |
6e444319 | 3373 | if (WARN_ON_ONCE(!edata)) |
41794f19 | 3374 | return; |
3cd715de | 3375 | |
6e444319 | 3376 | if (WARN_ON_ONCE(edata->ref <= 0)) |
3cd715de SRRH |
3377 | return; |
3378 | ||
6e444319 | 3379 | free_probe_data(edata); |
3cd715de SRRH |
3380 | } |
3381 | ||
3382 | static struct ftrace_probe_ops event_enable_probe_ops = { | |
3383 | .func = event_enable_probe, | |
3384 | .print = event_enable_print, | |
3385 | .init = event_enable_init, | |
3386 | .free = event_enable_free, | |
3387 | }; | |
3388 | ||
3389 | static struct ftrace_probe_ops event_enable_count_probe_ops = { | |
3390 | .func = event_enable_count_probe, | |
3391 | .print = event_enable_print, | |
3392 | .init = event_enable_init, | |
3393 | .free = event_enable_free, | |
3394 | }; | |
3395 | ||
3396 | static struct ftrace_probe_ops event_disable_probe_ops = { | |
3397 | .func = event_enable_probe, | |
3398 | .print = event_enable_print, | |
3399 | .init = event_enable_init, | |
3400 | .free = event_enable_free, | |
3401 | }; | |
3402 | ||
3403 | static struct ftrace_probe_ops event_disable_count_probe_ops = { | |
3404 | .func = event_enable_count_probe, | |
3405 | .print = event_enable_print, | |
3406 | .init = event_enable_init, | |
3407 | .free = event_enable_free, | |
3408 | }; | |
3409 | ||
3410 | static int | |
04ec7bb6 | 3411 | event_enable_func(struct trace_array *tr, struct ftrace_hash *hash, |
3cd715de SRRH |
3412 | char *glob, char *cmd, char *param, int enabled) |
3413 | { | |
7f1d2f82 | 3414 | struct trace_event_file *file; |
3cd715de SRRH |
3415 | struct ftrace_probe_ops *ops; |
3416 | struct event_probe_data *data; | |
3417 | const char *system; | |
3418 | const char *event; | |
3419 | char *number; | |
3420 | bool enable; | |
3421 | int ret; | |
3422 | ||
dc81e5e3 YY |
3423 | if (!tr) |
3424 | return -ENODEV; | |
3425 | ||
3cd715de | 3426 | /* hash funcs only work with set_ftrace_filter */ |
8092e808 | 3427 | if (!enabled || !param) |
3cd715de SRRH |
3428 | return -EINVAL; |
3429 | ||
3430 | system = strsep(¶m, ":"); | |
3431 | if (!param) | |
3432 | return -EINVAL; | |
3433 | ||
3434 | event = strsep(¶m, ":"); | |
3435 | ||
3436 | mutex_lock(&event_mutex); | |
3437 | ||
3438 | ret = -EINVAL; | |
3439 | file = find_event_file(tr, system, event); | |
3440 | if (!file) | |
3441 | goto out; | |
3442 | ||
3443 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; | |
3444 | ||
3445 | if (enable) | |
3446 | ops = param ? &event_enable_count_probe_ops : &event_enable_probe_ops; | |
3447 | else | |
3448 | ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops; | |
3449 | ||
3450 | if (glob[0] == '!') { | |
7b60f3d8 | 3451 | ret = unregister_ftrace_function_probe_func(glob+1, tr, ops); |
3cd715de SRRH |
3452 | goto out; |
3453 | } | |
3454 | ||
3455 | ret = -ENOMEM; | |
41794f19 | 3456 | |
3cd715de SRRH |
3457 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
3458 | if (!data) | |
3459 | goto out; | |
3460 | ||
3461 | data->enable = enable; | |
3462 | data->count = -1; | |
3463 | data->file = file; | |
3464 | ||
3465 | if (!param) | |
3466 | goto out_reg; | |
3467 | ||
3468 | number = strsep(¶m, ":"); | |
3469 | ||
3470 | ret = -EINVAL; | |
3471 | if (!strlen(number)) | |
3472 | goto out_free; | |
3473 | ||
3474 | /* | |
3475 | * We use the callback data field (which is a pointer) | |
3476 | * as our counter. | |
3477 | */ | |
3478 | ret = kstrtoul(number, 0, &data->count); | |
3479 | if (ret) | |
3480 | goto out_free; | |
3481 | ||
3482 | out_reg: | |
3483 | /* Don't let event modules unload while probe registered */ | |
1d18538e | 3484 | ret = trace_event_try_get_ref(file->event_call); |
6ed01066 MH |
3485 | if (!ret) { |
3486 | ret = -EBUSY; | |
3cd715de | 3487 | goto out_free; |
6ed01066 | 3488 | } |
3cd715de SRRH |
3489 | |
3490 | ret = __ftrace_event_enable_disable(file, 1, 1); | |
3491 | if (ret < 0) | |
3492 | goto out_put; | |
41794f19 | 3493 | |
04ec7bb6 | 3494 | ret = register_ftrace_function_probe(glob, tr, ops, data); |
ff305ded SRRH |
3495 | /* |
3496 | * The above returns on success the # of functions enabled, | |
3497 | * but if it didn't find any functions it returns zero. | |
3498 | * Consider no functions a failure too. | |
3499 | */ | |
a5b85bd1 MH |
3500 | if (!ret) { |
3501 | ret = -ENOENT; | |
3cd715de | 3502 | goto out_disable; |
ff305ded SRRH |
3503 | } else if (ret < 0) |
3504 | goto out_disable; | |
3505 | /* Just return zero, not the number of enabled functions */ | |
3506 | ret = 0; | |
3cd715de SRRH |
3507 | out: |
3508 | mutex_unlock(&event_mutex); | |
3509 | return ret; | |
3510 | ||
3511 | out_disable: | |
3512 | __ftrace_event_enable_disable(file, 0, 1); | |
3513 | out_put: | |
1d18538e | 3514 | trace_event_put_ref(file->event_call); |
3cd715de SRRH |
3515 | out_free: |
3516 | kfree(data); | |
3517 | goto out; | |
3518 | } | |
3519 | ||
3520 | static struct ftrace_func_command event_enable_cmd = { | |
3521 | .name = ENABLE_EVENT_STR, | |
3522 | .func = event_enable_func, | |
3523 | }; | |
3524 | ||
3525 | static struct ftrace_func_command event_disable_cmd = { | |
3526 | .name = DISABLE_EVENT_STR, | |
3527 | .func = event_enable_func, | |
3528 | }; | |
3529 | ||
3530 | static __init int register_event_cmds(void) | |
3531 | { | |
3532 | int ret; | |
3533 | ||
3534 | ret = register_ftrace_command(&event_enable_cmd); | |
3535 | if (WARN_ON(ret < 0)) | |
3536 | return ret; | |
3537 | ret = register_ftrace_command(&event_disable_cmd); | |
3538 | if (WARN_ON(ret < 0)) | |
3539 | unregister_ftrace_command(&event_enable_cmd); | |
3540 | return ret; | |
3541 | } | |
3542 | #else | |
3543 | static inline int register_event_cmds(void) { return 0; } | |
3544 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
3545 | ||
77248221 | 3546 | /* |
720dee53 MH |
3547 | * The top level array and trace arrays created by boot-time tracing |
3548 | * have already had its trace_event_file descriptors created in order | |
3549 | * to allow for early events to be recorded. | |
3550 | * This function is called after the tracefs has been initialized, | |
3551 | * and we now have to create the files associated to the events. | |
77248221 | 3552 | */ |
720dee53 | 3553 | static void __trace_early_add_event_dirs(struct trace_array *tr) |
77248221 | 3554 | { |
7f1d2f82 | 3555 | struct trace_event_file *file; |
77248221 SR |
3556 | int ret; |
3557 | ||
3558 | ||
3559 | list_for_each_entry(file, &tr->events, list) { | |
620a30e9 | 3560 | ret = event_create_dir(tr->event_dir, file); |
77248221 | 3561 | if (ret < 0) |
3448bac3 | 3562 | pr_warn("Could not create directory for event %s\n", |
687fcc4a | 3563 | trace_event_name(file->event_call)); |
77248221 SR |
3564 | } |
3565 | } | |
3566 | ||
3567 | /* | |
720dee53 MH |
3568 | * For early boot up, the top trace array and the trace arrays created |
3569 | * by boot-time tracing require to have a list of events that can be | |
3570 | * enabled. This must be done before the filesystem is set up in order | |
3571 | * to allow events to be traced early. | |
77248221 | 3572 | */ |
720dee53 | 3573 | void __trace_early_add_events(struct trace_array *tr) |
77248221 | 3574 | { |
2425bcb9 | 3575 | struct trace_event_call *call; |
77248221 SR |
3576 | int ret; |
3577 | ||
3578 | list_for_each_entry(call, &ftrace_events, list) { | |
3579 | /* Early boot up should not have any modules loaded */ | |
1d18538e SRV |
3580 | if (!(call->flags & TRACE_EVENT_FL_DYNAMIC) && |
3581 | WARN_ON_ONCE(call->module)) | |
77248221 SR |
3582 | continue; |
3583 | ||
3584 | ret = __trace_early_add_new_event(call, tr); | |
3585 | if (ret < 0) | |
3448bac3 | 3586 | pr_warn("Could not create early event %s\n", |
687fcc4a | 3587 | trace_event_name(call)); |
77248221 SR |
3588 | } |
3589 | } | |
3590 | ||
0c8916c3 SR |
3591 | /* Remove the event directory structure for a trace directory. */ |
3592 | static void | |
3593 | __trace_remove_event_dirs(struct trace_array *tr) | |
3594 | { | |
7f1d2f82 | 3595 | struct trace_event_file *file, *next; |
0c8916c3 | 3596 | |
f6a84bdc ON |
3597 | list_for_each_entry_safe(file, next, &tr->events, list) |
3598 | remove_event_file_dir(file); | |
0c8916c3 SR |
3599 | } |
3600 | ||
2425bcb9 | 3601 | static void __add_event_to_tracers(struct trace_event_call *call) |
ae63b31e SR |
3602 | { |
3603 | struct trace_array *tr; | |
3604 | ||
620a30e9 ON |
3605 | list_for_each_entry(tr, &ftrace_trace_arrays, list) |
3606 | __trace_add_new_event(call, tr); | |
ae63b31e SR |
3607 | } |
3608 | ||
2425bcb9 SRRH |
3609 | extern struct trace_event_call *__start_ftrace_events[]; |
3610 | extern struct trace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 3611 | |
020e5f85 LZ |
3612 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
3613 | ||
3614 | static __init int setup_trace_event(char *str) | |
3615 | { | |
c7dce4c5 | 3616 | strscpy(bootup_event_buf, str, COMMAND_LINE_SIZE); |
55034cd6 | 3617 | ring_buffer_expanded = true; |
60efe21e | 3618 | disable_tracing_selftest("running event tracing"); |
020e5f85 LZ |
3619 | |
3620 | return 1; | |
3621 | } | |
3622 | __setup("trace_event=", setup_trace_event); | |
3623 | ||
77248221 SR |
3624 | /* Expects to have event_mutex held when called */ |
3625 | static int | |
3626 | create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) | |
ae63b31e SR |
3627 | { |
3628 | struct dentry *d_events; | |
3629 | struct dentry *entry; | |
27152bce | 3630 | int error = 0; |
ae63b31e | 3631 | |
e4931b82 YW |
3632 | entry = trace_create_file("set_event", TRACE_MODE_WRITE, parent, |
3633 | tr, &ftrace_set_event_fops); | |
3634 | if (!entry) | |
ae63b31e | 3635 | return -ENOMEM; |
ae63b31e | 3636 | |
27152bce AK |
3637 | d_events = eventfs_create_events_dir("events", parent); |
3638 | if (IS_ERR(d_events)) { | |
8434dc93 | 3639 | pr_warn("Could not create tracefs 'events' directory\n"); |
277ba044 SR |
3640 | return -ENOMEM; |
3641 | } | |
ae63b31e | 3642 | |
27152bce | 3643 | error = eventfs_add_events_file("enable", TRACE_MODE_WRITE, d_events, |
7d436400 | 3644 | tr, &ftrace_tr_enable_fops); |
27152bce | 3645 | if (error) |
7d436400 | 3646 | return -ENOMEM; |
7d436400 SRRH |
3647 | |
3648 | /* There are not as crucial, just warn if they are not created */ | |
3649 | ||
e4931b82 YW |
3650 | trace_create_file("set_event_pid", TRACE_MODE_WRITE, parent, |
3651 | tr, &ftrace_set_event_pid_fops); | |
49090107 | 3652 | |
e4931b82 YW |
3653 | trace_create_file("set_event_notrace_pid", |
3654 | TRACE_MODE_WRITE, parent, tr, | |
3655 | &ftrace_set_event_notrace_pid_fops); | |
27683626 | 3656 | |
ae63b31e | 3657 | /* ring buffer internal formats */ |
27152bce | 3658 | eventfs_add_events_file("header_page", TRACE_MODE_READ, d_events, |
7d436400 SRRH |
3659 | ring_buffer_print_page_header, |
3660 | &ftrace_show_header_fops); | |
7d436400 | 3661 | |
27152bce | 3662 | eventfs_add_events_file("header_event", TRACE_MODE_READ, d_events, |
7d436400 SRRH |
3663 | ring_buffer_print_entry_header, |
3664 | &ftrace_show_header_fops); | |
ae63b31e SR |
3665 | |
3666 | tr->event_dir = d_events; | |
77248221 SR |
3667 | |
3668 | return 0; | |
3669 | } | |
3670 | ||
3671 | /** | |
3672 | * event_trace_add_tracer - add a instance of a trace_array to events | |
3673 | * @parent: The parent dentry to place the files/directories for events in | |
3674 | * @tr: The trace array associated with these events | |
3675 | * | |
3676 | * When a new instance is created, it needs to set up its events | |
3677 | * directory, as well as other files associated with events. It also | |
2b5894cc | 3678 | * creates the event hierarchy in the @parent/events directory. |
77248221 SR |
3679 | * |
3680 | * Returns 0 on success. | |
12ecef0c SRV |
3681 | * |
3682 | * Must be called with event_mutex held. | |
77248221 SR |
3683 | */ |
3684 | int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) | |
3685 | { | |
3686 | int ret; | |
3687 | ||
12ecef0c | 3688 | lockdep_assert_held(&event_mutex); |
77248221 SR |
3689 | |
3690 | ret = create_event_toplevel_files(parent, tr); | |
3691 | if (ret) | |
12ecef0c | 3692 | goto out; |
77248221 | 3693 | |
52f6ad6d | 3694 | down_write(&trace_event_sem); |
720dee53 MH |
3695 | /* If tr already has the event list, it is initialized in early boot. */ |
3696 | if (unlikely(!list_empty(&tr->events))) | |
3697 | __trace_early_add_event_dirs(tr); | |
3698 | else | |
3699 | __trace_add_event_dirs(tr); | |
52f6ad6d | 3700 | up_write(&trace_event_sem); |
277ba044 | 3701 | |
12ecef0c | 3702 | out: |
77248221 SR |
3703 | return ret; |
3704 | } | |
3705 | ||
3706 | /* | |
3707 | * The top trace array already had its file descriptors created. | |
3708 | * Now the files themselves need to be created. | |
3709 | */ | |
3710 | static __init int | |
3711 | early_event_add_tracer(struct dentry *parent, struct trace_array *tr) | |
3712 | { | |
3713 | int ret; | |
3714 | ||
3715 | mutex_lock(&event_mutex); | |
3716 | ||
3717 | ret = create_event_toplevel_files(parent, tr); | |
3718 | if (ret) | |
3719 | goto out_unlock; | |
3720 | ||
52f6ad6d | 3721 | down_write(&trace_event_sem); |
77248221 | 3722 | __trace_early_add_event_dirs(tr); |
52f6ad6d | 3723 | up_write(&trace_event_sem); |
77248221 SR |
3724 | |
3725 | out_unlock: | |
3726 | mutex_unlock(&event_mutex); | |
3727 | ||
3728 | return ret; | |
ae63b31e SR |
3729 | } |
3730 | ||
12ecef0c | 3731 | /* Must be called with event_mutex held */ |
0c8916c3 SR |
3732 | int event_trace_del_tracer(struct trace_array *tr) |
3733 | { | |
12ecef0c | 3734 | lockdep_assert_held(&event_mutex); |
0c8916c3 | 3735 | |
85f2b082 TZ |
3736 | /* Disable any event triggers and associated soft-disabled events */ |
3737 | clear_event_triggers(tr); | |
3738 | ||
49090107 | 3739 | /* Clear the pid list */ |
27683626 | 3740 | __ftrace_clear_event_pids(tr, TRACE_PIDS | TRACE_NO_PIDS); |
49090107 | 3741 | |
2a6c24af SRRH |
3742 | /* Disable any running events */ |
3743 | __ftrace_set_clr_event_nolock(tr, NULL, NULL, NULL, 0); | |
3744 | ||
e0a568dc SRV |
3745 | /* Make sure no more events are being executed */ |
3746 | tracepoint_synchronize_unregister(); | |
3ccb0123 | 3747 | |
52f6ad6d | 3748 | down_write(&trace_event_sem); |
0c8916c3 | 3749 | __trace_remove_event_dirs(tr); |
27152bce | 3750 | eventfs_remove_events_dir(tr->event_dir); |
52f6ad6d | 3751 | up_write(&trace_event_sem); |
0c8916c3 SR |
3752 | |
3753 | tr->event_dir = NULL; | |
3754 | ||
0c8916c3 SR |
3755 | return 0; |
3756 | } | |
3757 | ||
d1a29143 SR |
3758 | static __init int event_trace_memsetup(void) |
3759 | { | |
3760 | field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); | |
7f1d2f82 | 3761 | file_cachep = KMEM_CACHE(trace_event_file, SLAB_PANIC); |
d1a29143 SR |
3762 | return 0; |
3763 | } | |
3764 | ||
c4846480 SRG |
3765 | __init void |
3766 | early_enable_events(struct trace_array *tr, char *buf, bool disable_first) | |
ce1039bd | 3767 | { |
ce1039bd SRRH |
3768 | char *token; |
3769 | int ret; | |
3770 | ||
3771 | while (true) { | |
3772 | token = strsep(&buf, ","); | |
3773 | ||
3774 | if (!token) | |
3775 | break; | |
ce1039bd | 3776 | |
43ed3843 SRRH |
3777 | if (*token) { |
3778 | /* Restarting syscalls requires that we stop them first */ | |
3779 | if (disable_first) | |
3780 | ftrace_set_clr_event(tr, token, 0); | |
ce1039bd | 3781 | |
43ed3843 SRRH |
3782 | ret = ftrace_set_clr_event(tr, token, 1); |
3783 | if (ret) | |
3784 | pr_warn("Failed to enable trace event: %s\n", token); | |
3785 | } | |
ce1039bd SRRH |
3786 | |
3787 | /* Put back the comma to allow this to be called again */ | |
3788 | if (buf) | |
3789 | *(buf - 1) = ','; | |
3790 | } | |
3791 | } | |
3792 | ||
8781915a EG |
3793 | static __init int event_trace_enable(void) |
3794 | { | |
ae63b31e | 3795 | struct trace_array *tr = top_trace_array(); |
2425bcb9 | 3796 | struct trace_event_call **iter, *call; |
8781915a EG |
3797 | int ret; |
3798 | ||
dc81e5e3 YY |
3799 | if (!tr) |
3800 | return -ENODEV; | |
3801 | ||
8781915a EG |
3802 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { |
3803 | ||
3804 | call = *iter; | |
3805 | ret = event_init(call); | |
3806 | if (!ret) | |
3807 | list_add(&call->list, &ftrace_events); | |
3808 | } | |
3809 | ||
a01fdc89 SRG |
3810 | register_trigger_cmds(); |
3811 | ||
77248221 SR |
3812 | /* |
3813 | * We need the top trace array to have a working set of trace | |
3814 | * points at early init, before the debug files and directories | |
3815 | * are created. Create the file entries now, and attach them | |
3816 | * to the actual file dentries later. | |
3817 | */ | |
3818 | __trace_early_add_events(tr); | |
3819 | ||
c4846480 | 3820 | early_enable_events(tr, bootup_event_buf, false); |
81698831 SR |
3821 | |
3822 | trace_printk_start_comm(); | |
3823 | ||
3cd715de SRRH |
3824 | register_event_cmds(); |
3825 | ||
85f2b082 | 3826 | |
8781915a EG |
3827 | return 0; |
3828 | } | |
3829 | ||
ce1039bd SRRH |
3830 | /* |
3831 | * event_trace_enable() is called from trace_event_init() first to | |
3832 | * initialize events and perhaps start any events that are on the | |
3833 | * command line. Unfortunately, there are some events that will not | |
3834 | * start this early, like the system call tracepoints that need | |
524666cb GKB |
3835 | * to set the %SYSCALL_WORK_SYSCALL_TRACEPOINT flag of pid 1. But |
3836 | * event_trace_enable() is called before pid 1 starts, and this flag | |
3837 | * is never set, making the syscall tracepoint never get reached, but | |
3838 | * the event is enabled regardless (and not doing anything). | |
ce1039bd SRRH |
3839 | */ |
3840 | static __init int event_trace_enable_again(void) | |
3841 | { | |
3842 | struct trace_array *tr; | |
3843 | ||
3844 | tr = top_trace_array(); | |
3845 | if (!tr) | |
3846 | return -ENODEV; | |
3847 | ||
c4846480 | 3848 | early_enable_events(tr, bootup_event_buf, true); |
ce1039bd SRRH |
3849 | |
3850 | return 0; | |
3851 | } | |
3852 | ||
3853 | early_initcall(event_trace_enable_again); | |
3854 | ||
ac343da7 MH |
3855 | /* Init fields which doesn't related to the tracefs */ |
3856 | static __init int event_trace_init_fields(void) | |
3857 | { | |
3858 | if (trace_define_generic_fields()) | |
3859 | pr_warn("tracing: Failed to allocated generic fields"); | |
3860 | ||
3861 | if (trace_define_common_fields()) | |
3862 | pr_warn("tracing: Failed to allocate common fields"); | |
3863 | ||
3864 | return 0; | |
3865 | } | |
3866 | ||
58b92547 | 3867 | __init int event_trace_init(void) |
b77e38aa | 3868 | { |
ae63b31e | 3869 | struct trace_array *tr; |
6d723736 | 3870 | int ret; |
b77e38aa | 3871 | |
ae63b31e | 3872 | tr = top_trace_array(); |
dc81e5e3 YY |
3873 | if (!tr) |
3874 | return -ENODEV; | |
ae63b31e | 3875 | |
e4931b82 YW |
3876 | trace_create_file("available_events", TRACE_MODE_READ, |
3877 | NULL, tr, &ftrace_avail_fops); | |
2314c4ae | 3878 | |
dc300d77 | 3879 | ret = early_event_add_tracer(NULL, tr); |
ae63b31e SR |
3880 | if (ret) |
3881 | return ret; | |
020e5f85 | 3882 | |
836d481e | 3883 | #ifdef CONFIG_MODULES |
6d723736 | 3884 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 3885 | if (ret) |
3448bac3 | 3886 | pr_warn("Failed to register trace events module notifier\n"); |
836d481e | 3887 | #endif |
a838deab MH |
3888 | |
3889 | eventdir_initialized = true; | |
3890 | ||
b77e38aa SR |
3891 | return 0; |
3892 | } | |
5f893b26 SRRH |
3893 | |
3894 | void __init trace_event_init(void) | |
3895 | { | |
3896 | event_trace_memsetup(); | |
3897 | init_ftrace_syscalls(); | |
3898 | event_trace_enable(); | |
ac343da7 | 3899 | event_trace_init_fields(); |
5f893b26 SRRH |
3900 | } |
3901 | ||
b3015fe4 | 3902 | #ifdef CONFIG_EVENT_TRACE_STARTUP_TEST |
e6187007 SR |
3903 | |
3904 | static DEFINE_SPINLOCK(test_spinlock); | |
3905 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
3906 | static DEFINE_MUTEX(test_mutex); | |
3907 | ||
3908 | static __init void test_work(struct work_struct *dummy) | |
3909 | { | |
3910 | spin_lock(&test_spinlock); | |
3911 | spin_lock_irq(&test_spinlock_irq); | |
3912 | udelay(1); | |
3913 | spin_unlock_irq(&test_spinlock_irq); | |
3914 | spin_unlock(&test_spinlock); | |
3915 | ||
3916 | mutex_lock(&test_mutex); | |
3917 | msleep(1); | |
3918 | mutex_unlock(&test_mutex); | |
3919 | } | |
3920 | ||
3921 | static __init int event_test_thread(void *unused) | |
3922 | { | |
3923 | void *test_malloc; | |
3924 | ||
3925 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
3926 | if (!test_malloc) | |
3927 | pr_info("failed to kmalloc\n"); | |
3928 | ||
3929 | schedule_on_each_cpu(test_work); | |
3930 | ||
3931 | kfree(test_malloc); | |
3932 | ||
3933 | set_current_state(TASK_INTERRUPTIBLE); | |
fe0e01c7 | 3934 | while (!kthread_should_stop()) { |
e6187007 | 3935 | schedule(); |
fe0e01c7 PZ |
3936 | set_current_state(TASK_INTERRUPTIBLE); |
3937 | } | |
3938 | __set_current_state(TASK_RUNNING); | |
e6187007 SR |
3939 | |
3940 | return 0; | |
3941 | } | |
3942 | ||
3943 | /* | |
3944 | * Do various things that may trigger events. | |
3945 | */ | |
3946 | static __init void event_test_stuff(void) | |
3947 | { | |
3948 | struct task_struct *test_thread; | |
3949 | ||
3950 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
3951 | msleep(1); | |
3952 | kthread_stop(test_thread); | |
3953 | } | |
3954 | ||
3955 | /* | |
3956 | * For every trace event defined, we will test each trace point separately, | |
3957 | * and then by groups, and finally all trace points. | |
3958 | */ | |
9ea21c1e | 3959 | static __init void event_trace_self_tests(void) |
e6187007 | 3960 | { |
7967b3e0 | 3961 | struct trace_subsystem_dir *dir; |
7f1d2f82 | 3962 | struct trace_event_file *file; |
2425bcb9 | 3963 | struct trace_event_call *call; |
e6187007 | 3964 | struct event_subsystem *system; |
ae63b31e | 3965 | struct trace_array *tr; |
e6187007 SR |
3966 | int ret; |
3967 | ||
ae63b31e | 3968 | tr = top_trace_array(); |
dc81e5e3 YY |
3969 | if (!tr) |
3970 | return; | |
ae63b31e | 3971 | |
e6187007 SR |
3972 | pr_info("Running tests on trace events:\n"); |
3973 | ||
ae63b31e SR |
3974 | list_for_each_entry(file, &tr->events, list) { |
3975 | ||
3976 | call = file->event_call; | |
e6187007 | 3977 | |
2239291a SR |
3978 | /* Only test those that have a probe */ |
3979 | if (!call->class || !call->class->probe) | |
e6187007 SR |
3980 | continue; |
3981 | ||
1f5a6b45 SR |
3982 | /* |
3983 | * Testing syscall events here is pretty useless, but | |
3984 | * we still do it if configured. But this is time consuming. | |
3985 | * What we really need is a user thread to perform the | |
3986 | * syscalls as we test. | |
3987 | */ | |
3988 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
3989 | if (call->class->system && |
3990 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
3991 | continue; |
3992 | #endif | |
3993 | ||
687fcc4a | 3994 | pr_info("Testing event %s: ", trace_event_name(call)); |
e6187007 SR |
3995 | |
3996 | /* | |
3997 | * If an event is already enabled, someone is using | |
3998 | * it and the self test should not be on. | |
3999 | */ | |
5d6ad960 | 4000 | if (file->flags & EVENT_FILE_FL_ENABLED) { |
3448bac3 | 4001 | pr_warn("Enabled event during self test!\n"); |
e6187007 SR |
4002 | WARN_ON_ONCE(1); |
4003 | continue; | |
4004 | } | |
4005 | ||
ae63b31e | 4006 | ftrace_event_enable_disable(file, 1); |
e6187007 | 4007 | event_test_stuff(); |
ae63b31e | 4008 | ftrace_event_enable_disable(file, 0); |
e6187007 SR |
4009 | |
4010 | pr_cont("OK\n"); | |
4011 | } | |
4012 | ||
4013 | /* Now test at the sub system level */ | |
4014 | ||
4015 | pr_info("Running tests on trace event systems:\n"); | |
4016 | ||
ae63b31e SR |
4017 | list_for_each_entry(dir, &tr->systems, list) { |
4018 | ||
4019 | system = dir->subsystem; | |
e6187007 SR |
4020 | |
4021 | /* the ftrace system is special, skip it */ | |
4022 | if (strcmp(system->name, "ftrace") == 0) | |
4023 | continue; | |
4024 | ||
4025 | pr_info("Testing event system %s: ", system->name); | |
4026 | ||
ae63b31e | 4027 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
e6187007 | 4028 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
4029 | pr_warn("error enabling system %s\n", |
4030 | system->name); | |
e6187007 SR |
4031 | continue; |
4032 | } | |
4033 | ||
4034 | event_test_stuff(); | |
4035 | ||
ae63b31e | 4036 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
76bab1b7 | 4037 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
4038 | pr_warn("error disabling system %s\n", |
4039 | system->name); | |
76bab1b7 YL |
4040 | continue; |
4041 | } | |
e6187007 SR |
4042 | |
4043 | pr_cont("OK\n"); | |
4044 | } | |
4045 | ||
4046 | /* Test with all events enabled */ | |
4047 | ||
4048 | pr_info("Running tests on all trace events:\n"); | |
4049 | pr_info("Testing all events: "); | |
4050 | ||
ae63b31e | 4051 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
e6187007 | 4052 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 4053 | pr_warn("error enabling all events\n"); |
9ea21c1e | 4054 | return; |
e6187007 SR |
4055 | } |
4056 | ||
4057 | event_test_stuff(); | |
4058 | ||
4059 | /* reset sysname */ | |
ae63b31e | 4060 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
e6187007 | 4061 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 4062 | pr_warn("error disabling all events\n"); |
9ea21c1e | 4063 | return; |
e6187007 SR |
4064 | } |
4065 | ||
4066 | pr_cont("OK\n"); | |
9ea21c1e SR |
4067 | } |
4068 | ||
4069 | #ifdef CONFIG_FUNCTION_TRACER | |
4070 | ||
245b2e70 | 4071 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e | 4072 | |
9b9db275 | 4073 | static struct trace_event_file event_trace_file __initdata; |
b7f0c959 SRRH |
4074 | |
4075 | static void __init | |
2f5f6ad9 | 4076 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
d19ad077 | 4077 | struct ftrace_ops *op, struct ftrace_regs *regs) |
9ea21c1e | 4078 | { |
13292494 | 4079 | struct trace_buffer *buffer; |
9ea21c1e SR |
4080 | struct ring_buffer_event *event; |
4081 | struct ftrace_entry *entry; | |
36590c50 | 4082 | unsigned int trace_ctx; |
9ea21c1e | 4083 | long disabled; |
9ea21c1e | 4084 | int cpu; |
9ea21c1e | 4085 | |
36590c50 | 4086 | trace_ctx = tracing_gen_ctx(); |
5168ae50 | 4087 | preempt_disable_notrace(); |
9ea21c1e | 4088 | cpu = raw_smp_processor_id(); |
245b2e70 | 4089 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
4090 | |
4091 | if (disabled != 1) | |
4092 | goto out; | |
4093 | ||
9b9db275 SRRH |
4094 | event = trace_event_buffer_lock_reserve(&buffer, &event_trace_file, |
4095 | TRACE_FN, sizeof(*entry), | |
36590c50 | 4096 | trace_ctx); |
9ea21c1e SR |
4097 | if (!event) |
4098 | goto out; | |
4099 | entry = ring_buffer_event_data(event); | |
4100 | entry->ip = ip; | |
4101 | entry->parent_ip = parent_ip; | |
4102 | ||
9b9db275 | 4103 | event_trigger_unlock_commit(&event_trace_file, buffer, event, |
36590c50 | 4104 | entry, trace_ctx); |
9ea21c1e | 4105 | out: |
245b2e70 | 4106 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 4107 | preempt_enable_notrace(); |
9ea21c1e SR |
4108 | } |
4109 | ||
4110 | static struct ftrace_ops trace_ops __initdata = | |
4111 | { | |
4112 | .func = function_test_events_call, | |
4113 | }; | |
4114 | ||
4115 | static __init void event_trace_self_test_with_function(void) | |
4116 | { | |
17bb615a | 4117 | int ret; |
9b9db275 SRRH |
4118 | |
4119 | event_trace_file.tr = top_trace_array(); | |
4120 | if (WARN_ON(!event_trace_file.tr)) | |
2d34f489 | 4121 | return; |
9b9db275 | 4122 | |
17bb615a SR |
4123 | ret = register_ftrace_function(&trace_ops); |
4124 | if (WARN_ON(ret < 0)) { | |
4125 | pr_info("Failed to enable function tracer for event tests\n"); | |
4126 | return; | |
4127 | } | |
9ea21c1e SR |
4128 | pr_info("Running tests again, along with the function tracer\n"); |
4129 | event_trace_self_tests(); | |
4130 | unregister_ftrace_function(&trace_ops); | |
4131 | } | |
4132 | #else | |
4133 | static __init void event_trace_self_test_with_function(void) | |
4134 | { | |
4135 | } | |
4136 | #endif | |
4137 | ||
4138 | static __init int event_trace_self_tests_init(void) | |
4139 | { | |
020e5f85 LZ |
4140 | if (!tracing_selftest_disabled) { |
4141 | event_trace_self_tests(); | |
4142 | event_trace_self_test_with_function(); | |
4143 | } | |
e6187007 SR |
4144 | |
4145 | return 0; | |
4146 | } | |
4147 | ||
28d20e2d | 4148 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
4149 | |
4150 | #endif |