Commit | Line | Data |
---|---|---|
b77e38aa SR |
1 | /* |
2 | * event tracer | |
3 | * | |
4 | * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> | |
5 | * | |
981d081e SR |
6 | * - Added format output of fields of the trace point. |
7 | * This was based off of work by Tom Zanussi <tzanussi@gmail.com>. | |
8 | * | |
b77e38aa SR |
9 | */ |
10 | ||
e6187007 SR |
11 | #include <linux/workqueue.h> |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/kthread.h> | |
b77e38aa SR |
14 | #include <linux/debugfs.h> |
15 | #include <linux/uaccess.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/ctype.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
e6187007 | 19 | #include <linux/delay.h> |
b77e38aa | 20 | |
020e5f85 LZ |
21 | #include <asm/setup.h> |
22 | ||
91729ef9 | 23 | #include "trace_output.h" |
b77e38aa | 24 | |
6fa3eb70 S |
25 | #include <linux/mtk_ftrace.h> |
26 | ||
4e5292ea | 27 | #undef TRACE_SYSTEM |
b628b3e6 SR |
28 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
29 | ||
20c8928a | 30 | DEFINE_MUTEX(event_mutex); |
11a241a3 | 31 | |
a59fd602 | 32 | LIST_HEAD(ftrace_events); |
b3a8c6fd | 33 | static LIST_HEAD(ftrace_common_fields); |
a59fd602 | 34 | |
d1a29143 SR |
35 | #define GFP_TRACE (GFP_KERNEL | __GFP_ZERO) |
36 | ||
37 | static struct kmem_cache *field_cachep; | |
38 | static struct kmem_cache *file_cachep; | |
39 | ||
e6929efa SR |
40 | #define SYSTEM_FL_FREE_NAME (1 << 31) |
41 | ||
42 | static inline int system_refcount(struct event_subsystem *system) | |
43 | { | |
44 | return system->ref_count & ~SYSTEM_FL_FREE_NAME; | |
45 | } | |
46 | ||
47 | static int system_refcount_inc(struct event_subsystem *system) | |
48 | { | |
49 | return (system->ref_count++) & ~SYSTEM_FL_FREE_NAME; | |
50 | } | |
51 | ||
52 | static int system_refcount_dec(struct event_subsystem *system) | |
53 | { | |
54 | return (--system->ref_count) & ~SYSTEM_FL_FREE_NAME; | |
55 | } | |
56 | ||
ae63b31e SR |
57 | /* Double loops, do not use break, only goto's work */ |
58 | #define do_for_each_event_file(tr, file) \ | |
59 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
60 | list_for_each_entry(file, &tr->events, list) | |
61 | ||
62 | #define do_for_each_event_file_safe(tr, file) \ | |
63 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
64 | struct ftrace_event_file *___n; \ | |
65 | list_for_each_entry_safe(file, ___n, &tr->events, list) | |
66 | ||
67 | #define while_for_each_event_file() \ | |
68 | } | |
69 | ||
b3a8c6fd | 70 | static struct list_head * |
2e33af02 SR |
71 | trace_get_fields(struct ftrace_event_call *event_call) |
72 | { | |
73 | if (!event_call->class->get_fields) | |
74 | return &event_call->class->fields; | |
75 | return event_call->class->get_fields(event_call); | |
76 | } | |
77 | ||
b3a8c6fd J |
78 | static struct ftrace_event_field * |
79 | __find_event_field(struct list_head *head, char *name) | |
80 | { | |
81 | struct ftrace_event_field *field; | |
82 | ||
83 | list_for_each_entry(field, head, link) { | |
84 | if (!strcmp(field->name, name)) | |
85 | return field; | |
86 | } | |
87 | ||
88 | return NULL; | |
89 | } | |
90 | ||
91 | struct ftrace_event_field * | |
92 | trace_find_event_field(struct ftrace_event_call *call, char *name) | |
93 | { | |
94 | struct ftrace_event_field *field; | |
95 | struct list_head *head; | |
96 | ||
97 | field = __find_event_field(&ftrace_common_fields, name); | |
98 | if (field) | |
99 | return field; | |
100 | ||
101 | head = trace_get_fields(call); | |
102 | return __find_event_field(head, name); | |
103 | } | |
104 | ||
8728fe50 LZ |
105 | static int __trace_define_field(struct list_head *head, const char *type, |
106 | const char *name, int offset, int size, | |
107 | int is_signed, int filter_type) | |
cf027f64 TZ |
108 | { |
109 | struct ftrace_event_field *field; | |
110 | ||
d1a29143 | 111 | field = kmem_cache_alloc(field_cachep, GFP_TRACE); |
cf027f64 | 112 | if (!field) |
b0cfaffa | 113 | return -ENOMEM; |
fe9f57f2 | 114 | |
92edca07 SR |
115 | field->name = name; |
116 | field->type = type; | |
fe9f57f2 | 117 | |
43b51ead LZ |
118 | if (filter_type == FILTER_OTHER) |
119 | field->filter_type = filter_assign_type(type); | |
120 | else | |
121 | field->filter_type = filter_type; | |
122 | ||
cf027f64 TZ |
123 | field->offset = offset; |
124 | field->size = size; | |
a118e4d1 | 125 | field->is_signed = is_signed; |
aa38e9fc | 126 | |
2e33af02 | 127 | list_add(&field->link, head); |
cf027f64 TZ |
128 | |
129 | return 0; | |
cf027f64 | 130 | } |
8728fe50 LZ |
131 | |
132 | int trace_define_field(struct ftrace_event_call *call, const char *type, | |
133 | const char *name, int offset, int size, int is_signed, | |
134 | int filter_type) | |
135 | { | |
136 | struct list_head *head; | |
137 | ||
138 | if (WARN_ON(!call->class)) | |
139 | return 0; | |
140 | ||
141 | head = trace_get_fields(call); | |
142 | return __trace_define_field(head, type, name, offset, size, | |
143 | is_signed, filter_type); | |
144 | } | |
17c873ec | 145 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 146 | |
e647d6b3 | 147 | #define __common_field(type, item) \ |
8728fe50 LZ |
148 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
149 | "common_" #item, \ | |
150 | offsetof(typeof(ent), item), \ | |
151 | sizeof(ent.item), \ | |
152 | is_signed_type(type), FILTER_OTHER); \ | |
e647d6b3 LZ |
153 | if (ret) \ |
154 | return ret; | |
155 | ||
8728fe50 | 156 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
157 | { |
158 | int ret; | |
159 | struct trace_entry ent; | |
160 | ||
161 | __common_field(unsigned short, type); | |
162 | __common_field(unsigned char, flags); | |
163 | __common_field(unsigned char, preempt_count); | |
164 | __common_field(int, pid); | |
e647d6b3 LZ |
165 | |
166 | return ret; | |
167 | } | |
168 | ||
ad7067ce | 169 | static void trace_destroy_fields(struct ftrace_event_call *call) |
2df75e41 LZ |
170 | { |
171 | struct ftrace_event_field *field, *next; | |
2e33af02 | 172 | struct list_head *head; |
2df75e41 | 173 | |
2e33af02 SR |
174 | head = trace_get_fields(call); |
175 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 | 176 | list_del(&field->link); |
d1a29143 | 177 | kmem_cache_free(field_cachep, field); |
2df75e41 LZ |
178 | } |
179 | } | |
180 | ||
87d9b4e1 LZ |
181 | int trace_event_raw_init(struct ftrace_event_call *call) |
182 | { | |
183 | int id; | |
184 | ||
80decc70 | 185 | id = register_ftrace_event(&call->event); |
87d9b4e1 LZ |
186 | if (!id) |
187 | return -ENODEV; | |
87d9b4e1 LZ |
188 | |
189 | return 0; | |
190 | } | |
191 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
192 | ||
ceec0b6f JO |
193 | int ftrace_event_reg(struct ftrace_event_call *call, |
194 | enum trace_reg type, void *data) | |
a1d0ce82 | 195 | { |
ae63b31e SR |
196 | struct ftrace_event_file *file = data; |
197 | ||
a1d0ce82 SR |
198 | switch (type) { |
199 | case TRACE_REG_REGISTER: | |
200 | return tracepoint_probe_register(call->name, | |
201 | call->class->probe, | |
ae63b31e | 202 | file); |
a1d0ce82 SR |
203 | case TRACE_REG_UNREGISTER: |
204 | tracepoint_probe_unregister(call->name, | |
205 | call->class->probe, | |
ae63b31e | 206 | file); |
a1d0ce82 SR |
207 | return 0; |
208 | ||
209 | #ifdef CONFIG_PERF_EVENTS | |
210 | case TRACE_REG_PERF_REGISTER: | |
211 | return tracepoint_probe_register(call->name, | |
212 | call->class->perf_probe, | |
213 | call); | |
214 | case TRACE_REG_PERF_UNREGISTER: | |
215 | tracepoint_probe_unregister(call->name, | |
216 | call->class->perf_probe, | |
217 | call); | |
218 | return 0; | |
ceec0b6f JO |
219 | case TRACE_REG_PERF_OPEN: |
220 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
221 | case TRACE_REG_PERF_ADD: |
222 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 223 | return 0; |
a1d0ce82 SR |
224 | #endif |
225 | } | |
226 | return 0; | |
227 | } | |
228 | EXPORT_SYMBOL_GPL(ftrace_event_reg); | |
229 | ||
e870e9a1 LZ |
230 | void trace_event_enable_cmd_record(bool enable) |
231 | { | |
ae63b31e SR |
232 | struct ftrace_event_file *file; |
233 | struct trace_array *tr; | |
e870e9a1 LZ |
234 | |
235 | mutex_lock(&event_mutex); | |
ae63b31e SR |
236 | do_for_each_event_file(tr, file) { |
237 | ||
238 | if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) | |
e870e9a1 LZ |
239 | continue; |
240 | ||
241 | if (enable) { | |
242 | tracing_start_cmdline_record(); | |
417944c4 | 243 | set_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 LZ |
244 | } else { |
245 | tracing_stop_cmdline_record(); | |
417944c4 | 246 | clear_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 247 | } |
ae63b31e | 248 | } while_for_each_event_file(); |
e870e9a1 LZ |
249 | mutex_unlock(&event_mutex); |
250 | } | |
251 | ||
417944c4 SRRH |
252 | static int __ftrace_event_enable_disable(struct ftrace_event_file *file, |
253 | int enable, int soft_disable) | |
fd994989 | 254 | { |
ae63b31e | 255 | struct ftrace_event_call *call = file->event_call; |
3b8e4273 | 256 | int ret = 0; |
417944c4 | 257 | int disable; |
3b8e4273 | 258 | |
6fa3eb70 S |
259 | if(call->name && ((file->flags & FTRACE_EVENT_FL_ENABLED) ^ enable)) |
260 | printk(KERN_INFO "[ftrace]event '%s' is %s\n", call->name, enable?"enabled":"disabled"); | |
261 | ||
fd994989 SR |
262 | switch (enable) { |
263 | case 0: | |
417944c4 | 264 | /* |
1cf4c073 MH |
265 | * When soft_disable is set and enable is cleared, the sm_ref |
266 | * reference counter is decremented. If it reaches 0, we want | |
417944c4 SRRH |
267 | * to clear the SOFT_DISABLED flag but leave the event in the |
268 | * state that it was. That is, if the event was enabled and | |
269 | * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED | |
270 | * is set we do not want the event to be enabled before we | |
271 | * clear the bit. | |
272 | * | |
273 | * When soft_disable is not set but the SOFT_MODE flag is, | |
274 | * we do nothing. Do not disable the tracepoint, otherwise | |
275 | * "soft enable"s (clearing the SOFT_DISABLED bit) wont work. | |
276 | */ | |
277 | if (soft_disable) { | |
1cf4c073 MH |
278 | if (atomic_dec_return(&file->sm_ref) > 0) |
279 | break; | |
417944c4 SRRH |
280 | disable = file->flags & FTRACE_EVENT_FL_SOFT_DISABLED; |
281 | clear_bit(FTRACE_EVENT_FL_SOFT_MODE_BIT, &file->flags); | |
282 | } else | |
283 | disable = !(file->flags & FTRACE_EVENT_FL_SOFT_MODE); | |
284 | ||
285 | if (disable && (file->flags & FTRACE_EVENT_FL_ENABLED)) { | |
286 | clear_bit(FTRACE_EVENT_FL_ENABLED_BIT, &file->flags); | |
ae63b31e | 287 | if (file->flags & FTRACE_EVENT_FL_RECORDED_CMD) { |
e870e9a1 | 288 | tracing_stop_cmdline_record(); |
417944c4 | 289 | clear_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 290 | } |
ae63b31e | 291 | call->class->reg(call, TRACE_REG_UNREGISTER, file); |
fd994989 | 292 | } |
417944c4 SRRH |
293 | /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT */ |
294 | if (file->flags & FTRACE_EVENT_FL_SOFT_MODE) | |
295 | set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); | |
fd994989 SR |
296 | break; |
297 | case 1: | |
417944c4 SRRH |
298 | /* |
299 | * When soft_disable is set and enable is set, we want to | |
300 | * register the tracepoint for the event, but leave the event | |
301 | * as is. That means, if the event was already enabled, we do | |
302 | * nothing (but set SOFT_MODE). If the event is disabled, we | |
303 | * set SOFT_DISABLED before enabling the event tracepoint, so | |
304 | * it still seems to be disabled. | |
305 | */ | |
306 | if (!soft_disable) | |
307 | clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); | |
1cf4c073 MH |
308 | else { |
309 | if (atomic_inc_return(&file->sm_ref) > 1) | |
310 | break; | |
417944c4 | 311 | set_bit(FTRACE_EVENT_FL_SOFT_MODE_BIT, &file->flags); |
1cf4c073 | 312 | } |
417944c4 | 313 | |
ae63b31e | 314 | if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) { |
417944c4 SRRH |
315 | |
316 | /* Keep the event disabled, when going to SOFT_MODE. */ | |
317 | if (soft_disable) | |
318 | set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); | |
319 | ||
e870e9a1 LZ |
320 | if (trace_flags & TRACE_ITER_RECORD_CMD) { |
321 | tracing_start_cmdline_record(); | |
417944c4 | 322 | set_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 323 | } |
ae63b31e | 324 | ret = call->class->reg(call, TRACE_REG_REGISTER, file); |
3b8e4273 LZ |
325 | if (ret) { |
326 | tracing_stop_cmdline_record(); | |
327 | pr_info("event trace: Could not enable event " | |
328 | "%s\n", call->name); | |
329 | break; | |
330 | } | |
417944c4 | 331 | set_bit(FTRACE_EVENT_FL_ENABLED_BIT, &file->flags); |
575380da SRRH |
332 | |
333 | /* WAS_ENABLED gets set but never cleared. */ | |
334 | call->flags |= TRACE_EVENT_FL_WAS_ENABLED; | |
fd994989 | 335 | } |
fd994989 SR |
336 | break; |
337 | } | |
3b8e4273 LZ |
338 | |
339 | return ret; | |
fd994989 SR |
340 | } |
341 | ||
417944c4 SRRH |
342 | static int ftrace_event_enable_disable(struct ftrace_event_file *file, |
343 | int enable) | |
344 | { | |
345 | return __ftrace_event_enable_disable(file, enable, 0); | |
346 | } | |
347 | ||
ae63b31e | 348 | static void ftrace_clear_events(struct trace_array *tr) |
0e907c99 | 349 | { |
ae63b31e | 350 | struct ftrace_event_file *file; |
0e907c99 Z |
351 | |
352 | mutex_lock(&event_mutex); | |
ae63b31e SR |
353 | list_for_each_entry(file, &tr->events, list) { |
354 | ftrace_event_enable_disable(file, 0); | |
0e907c99 Z |
355 | } |
356 | mutex_unlock(&event_mutex); | |
357 | } | |
358 | ||
e9dbfae5 SR |
359 | static void __put_system(struct event_subsystem *system) |
360 | { | |
361 | struct event_filter *filter = system->filter; | |
362 | ||
e6929efa SR |
363 | WARN_ON_ONCE(system_refcount(system) == 0); |
364 | if (system_refcount_dec(system)) | |
e9dbfae5 SR |
365 | return; |
366 | ||
ae63b31e SR |
367 | list_del(&system->list); |
368 | ||
e9dbfae5 SR |
369 | if (filter) { |
370 | kfree(filter->filter_string); | |
371 | kfree(filter); | |
372 | } | |
e6929efa SR |
373 | if (system->ref_count & SYSTEM_FL_FREE_NAME) |
374 | kfree(system->name); | |
e9dbfae5 SR |
375 | kfree(system); |
376 | } | |
377 | ||
378 | static void __get_system(struct event_subsystem *system) | |
379 | { | |
e6929efa SR |
380 | WARN_ON_ONCE(system_refcount(system) == 0); |
381 | system_refcount_inc(system); | |
e9dbfae5 SR |
382 | } |
383 | ||
ae63b31e SR |
384 | static void __get_system_dir(struct ftrace_subsystem_dir *dir) |
385 | { | |
386 | WARN_ON_ONCE(dir->ref_count == 0); | |
387 | dir->ref_count++; | |
388 | __get_system(dir->subsystem); | |
389 | } | |
390 | ||
391 | static void __put_system_dir(struct ftrace_subsystem_dir *dir) | |
392 | { | |
393 | WARN_ON_ONCE(dir->ref_count == 0); | |
394 | /* If the subsystem is about to be freed, the dir must be too */ | |
e6929efa | 395 | WARN_ON_ONCE(system_refcount(dir->subsystem) == 1 && dir->ref_count != 1); |
ae63b31e SR |
396 | |
397 | __put_system(dir->subsystem); | |
398 | if (!--dir->ref_count) | |
399 | kfree(dir); | |
400 | } | |
401 | ||
402 | static void put_system(struct ftrace_subsystem_dir *dir) | |
e9dbfae5 SR |
403 | { |
404 | mutex_lock(&event_mutex); | |
ae63b31e | 405 | __put_system_dir(dir); |
e9dbfae5 SR |
406 | mutex_unlock(&event_mutex); |
407 | } | |
408 | ||
c6febdf2 ON |
409 | static void remove_subsystem(struct ftrace_subsystem_dir *dir) |
410 | { | |
411 | if (!dir) | |
412 | return; | |
413 | ||
414 | if (!--dir->nr_events) { | |
415 | debugfs_remove_recursive(dir->entry); | |
416 | list_del(&dir->list); | |
417 | __put_system_dir(dir); | |
418 | } | |
419 | } | |
420 | ||
fdb65fe2 ON |
421 | static void *event_file_data(struct file *filp) |
422 | { | |
423 | return ACCESS_ONCE(file_inode(filp)->i_private); | |
424 | } | |
425 | ||
c6febdf2 ON |
426 | static void remove_event_file_dir(struct ftrace_event_file *file) |
427 | { | |
012dc156 ON |
428 | struct dentry *dir = file->dir; |
429 | struct dentry *child; | |
430 | ||
431 | if (dir) { | |
432 | spin_lock(&dir->d_lock); /* probably unneeded */ | |
6637ecd3 | 433 | list_for_each_entry(child, &dir->d_subdirs, d_child) { |
012dc156 ON |
434 | if (child->d_inode) /* probably unneeded */ |
435 | child->d_inode->i_private = NULL; | |
436 | } | |
437 | spin_unlock(&dir->d_lock); | |
438 | ||
439 | debugfs_remove_recursive(dir); | |
440 | } | |
441 | ||
c6febdf2 | 442 | list_del(&file->list); |
c6febdf2 ON |
443 | remove_subsystem(file->system); |
444 | kmem_cache_free(file_cachep, file); | |
445 | } | |
446 | ||
8f31bfe5 LZ |
447 | /* |
448 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
449 | */ | |
68cebd26 SRRH |
450 | static int |
451 | __ftrace_set_clr_event_nolock(struct trace_array *tr, const char *match, | |
452 | const char *sub, const char *event, int set) | |
b77e38aa | 453 | { |
ae63b31e | 454 | struct ftrace_event_file *file; |
a59fd602 | 455 | struct ftrace_event_call *call; |
29f93943 | 456 | int ret = -EINVAL; |
8f31bfe5 | 457 | |
ae63b31e SR |
458 | list_for_each_entry(file, &tr->events, list) { |
459 | ||
460 | call = file->event_call; | |
8f31bfe5 | 461 | |
a1d0ce82 | 462 | if (!call->name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
463 | continue; |
464 | ||
9b63776f SR |
465 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
466 | continue; | |
467 | ||
8f31bfe5 LZ |
468 | if (match && |
469 | strcmp(match, call->name) != 0 && | |
8f082018 | 470 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
471 | continue; |
472 | ||
8f082018 | 473 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
474 | continue; |
475 | ||
476 | if (event && strcmp(event, call->name) != 0) | |
477 | continue; | |
478 | ||
ae63b31e | 479 | ftrace_event_enable_disable(file, set); |
8f31bfe5 LZ |
480 | |
481 | ret = 0; | |
482 | } | |
68cebd26 SRRH |
483 | |
484 | return ret; | |
485 | } | |
486 | ||
487 | static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, | |
488 | const char *sub, const char *event, int set) | |
489 | { | |
490 | int ret; | |
491 | ||
492 | mutex_lock(&event_mutex); | |
493 | ret = __ftrace_set_clr_event_nolock(tr, match, sub, event, set); | |
8f31bfe5 LZ |
494 | mutex_unlock(&event_mutex); |
495 | ||
496 | return ret; | |
497 | } | |
498 | ||
ae63b31e | 499 | static int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set) |
8f31bfe5 | 500 | { |
b628b3e6 | 501 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
502 | |
503 | /* | |
504 | * The buf format can be <subsystem>:<event-name> | |
505 | * *:<event-name> means any event by that name. | |
506 | * :<event-name> is the same. | |
507 | * | |
508 | * <subsystem>:* means all events in that subsystem | |
509 | * <subsystem>: means the same. | |
510 | * | |
511 | * <name> (no ':') means all events in a subsystem with | |
512 | * the name <name> or any event that matches <name> | |
513 | */ | |
514 | ||
515 | match = strsep(&buf, ":"); | |
516 | if (buf) { | |
517 | sub = match; | |
518 | event = buf; | |
519 | match = NULL; | |
520 | ||
521 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
522 | sub = NULL; | |
523 | if (!strlen(event) || strcmp(event, "*") == 0) | |
524 | event = NULL; | |
525 | } | |
b77e38aa | 526 | |
ae63b31e | 527 | return __ftrace_set_clr_event(tr, match, sub, event, set); |
b77e38aa SR |
528 | } |
529 | ||
4671c794 SR |
530 | /** |
531 | * trace_set_clr_event - enable or disable an event | |
532 | * @system: system name to match (NULL for any system) | |
533 | * @event: event name to match (NULL for all events, within system) | |
534 | * @set: 1 to enable, 0 to disable | |
535 | * | |
536 | * This is a way for other parts of the kernel to enable or disable | |
537 | * event recording. | |
538 | * | |
539 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
540 | * registered events. | |
541 | */ | |
542 | int trace_set_clr_event(const char *system, const char *event, int set) | |
543 | { | |
ae63b31e SR |
544 | struct trace_array *tr = top_trace_array(); |
545 | ||
546 | return __ftrace_set_clr_event(tr, NULL, system, event, set); | |
4671c794 | 547 | } |
56355b83 | 548 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 549 | |
b77e38aa SR |
550 | /* 128 should be much more than enough */ |
551 | #define EVENT_BUF_SIZE 127 | |
552 | ||
553 | static ssize_t | |
554 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
555 | size_t cnt, loff_t *ppos) | |
556 | { | |
48966364 | 557 | struct trace_parser parser; |
ae63b31e SR |
558 | struct seq_file *m = file->private_data; |
559 | struct trace_array *tr = m->private; | |
4ba7978e | 560 | ssize_t read, ret; |
b77e38aa | 561 | |
4ba7978e | 562 | if (!cnt) |
b77e38aa SR |
563 | return 0; |
564 | ||
1852fcce SR |
565 | ret = tracing_update_buffers(); |
566 | if (ret < 0) | |
567 | return ret; | |
568 | ||
48966364 | 569 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
570 | return -ENOMEM; |
571 | ||
48966364 | 572 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
573 | ||
4ba7978e | 574 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 575 | int set = 1; |
b77e38aa | 576 | |
48966364 | 577 | if (*parser.buffer == '!') |
b77e38aa | 578 | set = 0; |
b77e38aa | 579 | |
48966364 | 580 | parser.buffer[parser.idx] = 0; |
581 | ||
ae63b31e | 582 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
b77e38aa | 583 | if (ret) |
48966364 | 584 | goto out_put; |
b77e38aa | 585 | } |
b77e38aa SR |
586 | |
587 | ret = read; | |
588 | ||
48966364 | 589 | out_put: |
590 | trace_parser_put(&parser); | |
b77e38aa SR |
591 | |
592 | return ret; | |
593 | } | |
594 | ||
595 | static void * | |
596 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
597 | { | |
ae63b31e SR |
598 | struct ftrace_event_file *file = v; |
599 | struct ftrace_event_call *call; | |
600 | struct trace_array *tr = m->private; | |
b77e38aa SR |
601 | |
602 | (*pos)++; | |
603 | ||
ae63b31e SR |
604 | list_for_each_entry_continue(file, &tr->events, list) { |
605 | call = file->event_call; | |
40e26815 SR |
606 | /* |
607 | * The ftrace subsystem is for showing formats only. | |
608 | * They can not be enabled or disabled via the event files. | |
609 | */ | |
a1d0ce82 | 610 | if (call->class && call->class->reg) |
ae63b31e | 611 | return file; |
40e26815 | 612 | } |
b77e38aa | 613 | |
30bd39cd | 614 | return NULL; |
b77e38aa SR |
615 | } |
616 | ||
617 | static void *t_start(struct seq_file *m, loff_t *pos) | |
618 | { | |
ae63b31e SR |
619 | struct ftrace_event_file *file; |
620 | struct trace_array *tr = m->private; | |
e1c7e2a6 LZ |
621 | loff_t l; |
622 | ||
20c8928a | 623 | mutex_lock(&event_mutex); |
e1c7e2a6 | 624 | |
ae63b31e | 625 | file = list_entry(&tr->events, struct ftrace_event_file, list); |
e1c7e2a6 | 626 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
627 | file = t_next(m, file, &l); |
628 | if (!file) | |
e1c7e2a6 LZ |
629 | break; |
630 | } | |
ae63b31e | 631 | return file; |
b77e38aa SR |
632 | } |
633 | ||
634 | static void * | |
635 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
636 | { | |
ae63b31e SR |
637 | struct ftrace_event_file *file = v; |
638 | struct trace_array *tr = m->private; | |
b77e38aa SR |
639 | |
640 | (*pos)++; | |
641 | ||
ae63b31e SR |
642 | list_for_each_entry_continue(file, &tr->events, list) { |
643 | if (file->flags & FTRACE_EVENT_FL_ENABLED) | |
644 | return file; | |
b77e38aa SR |
645 | } |
646 | ||
30bd39cd | 647 | return NULL; |
b77e38aa SR |
648 | } |
649 | ||
650 | static void *s_start(struct seq_file *m, loff_t *pos) | |
651 | { | |
ae63b31e SR |
652 | struct ftrace_event_file *file; |
653 | struct trace_array *tr = m->private; | |
e1c7e2a6 LZ |
654 | loff_t l; |
655 | ||
20c8928a | 656 | mutex_lock(&event_mutex); |
e1c7e2a6 | 657 | |
ae63b31e | 658 | file = list_entry(&tr->events, struct ftrace_event_file, list); |
e1c7e2a6 | 659 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
660 | file = s_next(m, file, &l); |
661 | if (!file) | |
e1c7e2a6 LZ |
662 | break; |
663 | } | |
ae63b31e | 664 | return file; |
b77e38aa SR |
665 | } |
666 | ||
667 | static int t_show(struct seq_file *m, void *v) | |
668 | { | |
ae63b31e SR |
669 | struct ftrace_event_file *file = v; |
670 | struct ftrace_event_call *call = file->event_call; | |
b77e38aa | 671 | |
8f082018 SR |
672 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
673 | seq_printf(m, "%s:", call->class->system); | |
b77e38aa SR |
674 | seq_printf(m, "%s\n", call->name); |
675 | ||
676 | return 0; | |
677 | } | |
678 | ||
679 | static void t_stop(struct seq_file *m, void *p) | |
680 | { | |
20c8928a | 681 | mutex_unlock(&event_mutex); |
b77e38aa SR |
682 | } |
683 | ||
1473e441 SR |
684 | static ssize_t |
685 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
686 | loff_t *ppos) | |
687 | { | |
df89bf77 ON |
688 | struct ftrace_event_file *file; |
689 | unsigned long flags; | |
1473e441 SR |
690 | char *buf; |
691 | ||
df89bf77 ON |
692 | mutex_lock(&event_mutex); |
693 | file = event_file_data(filp); | |
694 | if (likely(file)) | |
695 | flags = file->flags; | |
696 | mutex_unlock(&event_mutex); | |
697 | ||
698 | if (!file) | |
699 | return -ENODEV; | |
700 | ||
701 | if (flags & FTRACE_EVENT_FL_ENABLED) { | |
702 | if (flags & FTRACE_EVENT_FL_SOFT_DISABLED) | |
417944c4 | 703 | buf = "0*\n"; |
df89bf77 | 704 | else if (flags & FTRACE_EVENT_FL_SOFT_MODE) |
30052170 | 705 | buf = "1*\n"; |
417944c4 SRRH |
706 | else |
707 | buf = "1\n"; | |
708 | } else | |
1473e441 SR |
709 | buf = "0\n"; |
710 | ||
417944c4 | 711 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf)); |
1473e441 SR |
712 | } |
713 | ||
714 | static ssize_t | |
715 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
716 | loff_t *ppos) | |
717 | { | |
df89bf77 | 718 | struct ftrace_event_file *file; |
1473e441 SR |
719 | unsigned long val; |
720 | int ret; | |
721 | ||
22fe9b54 PH |
722 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
723 | if (ret) | |
1473e441 SR |
724 | return ret; |
725 | ||
1852fcce SR |
726 | ret = tracing_update_buffers(); |
727 | if (ret < 0) | |
728 | return ret; | |
729 | ||
1473e441 SR |
730 | switch (val) { |
731 | case 0: | |
1473e441 | 732 | case 1: |
df89bf77 | 733 | ret = -ENODEV; |
11a241a3 | 734 | mutex_lock(&event_mutex); |
df89bf77 ON |
735 | file = event_file_data(filp); |
736 | if (likely(file)) | |
737 | ret = ftrace_event_enable_disable(file, val); | |
11a241a3 | 738 | mutex_unlock(&event_mutex); |
1473e441 SR |
739 | break; |
740 | ||
741 | default: | |
742 | return -EINVAL; | |
743 | } | |
744 | ||
745 | *ppos += cnt; | |
746 | ||
3b8e4273 | 747 | return ret ? ret : cnt; |
1473e441 SR |
748 | } |
749 | ||
8ae79a13 SR |
750 | static ssize_t |
751 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
752 | loff_t *ppos) | |
753 | { | |
c142b15d | 754 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
ae63b31e SR |
755 | struct ftrace_subsystem_dir *dir = filp->private_data; |
756 | struct event_subsystem *system = dir->subsystem; | |
8ae79a13 | 757 | struct ftrace_event_call *call; |
ae63b31e SR |
758 | struct ftrace_event_file *file; |
759 | struct trace_array *tr = dir->tr; | |
8ae79a13 | 760 | char buf[2]; |
c142b15d | 761 | int set = 0; |
8ae79a13 SR |
762 | int ret; |
763 | ||
8ae79a13 | 764 | mutex_lock(&event_mutex); |
ae63b31e SR |
765 | list_for_each_entry(file, &tr->events, list) { |
766 | call = file->event_call; | |
a1d0ce82 | 767 | if (!call->name || !call->class || !call->class->reg) |
8ae79a13 SR |
768 | continue; |
769 | ||
40ee4dff | 770 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
771 | continue; |
772 | ||
773 | /* | |
774 | * We need to find out if all the events are set | |
775 | * or if all events or cleared, or if we have | |
776 | * a mixture. | |
777 | */ | |
ae63b31e | 778 | set |= (1 << !!(file->flags & FTRACE_EVENT_FL_ENABLED)); |
c142b15d | 779 | |
8ae79a13 SR |
780 | /* |
781 | * If we have a mixture, no need to look further. | |
782 | */ | |
c142b15d | 783 | if (set == 3) |
8ae79a13 SR |
784 | break; |
785 | } | |
786 | mutex_unlock(&event_mutex); | |
787 | ||
c142b15d | 788 | buf[0] = set_to_char[set]; |
8ae79a13 | 789 | buf[1] = '\n'; |
8ae79a13 SR |
790 | |
791 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
792 | ||
793 | return ret; | |
794 | } | |
795 | ||
796 | static ssize_t | |
797 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
798 | loff_t *ppos) | |
799 | { | |
ae63b31e SR |
800 | struct ftrace_subsystem_dir *dir = filp->private_data; |
801 | struct event_subsystem *system = dir->subsystem; | |
40ee4dff | 802 | const char *name = NULL; |
8ae79a13 | 803 | unsigned long val; |
8ae79a13 SR |
804 | ssize_t ret; |
805 | ||
22fe9b54 PH |
806 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
807 | if (ret) | |
8ae79a13 SR |
808 | return ret; |
809 | ||
810 | ret = tracing_update_buffers(); | |
811 | if (ret < 0) | |
812 | return ret; | |
813 | ||
8f31bfe5 | 814 | if (val != 0 && val != 1) |
8ae79a13 | 815 | return -EINVAL; |
8ae79a13 | 816 | |
40ee4dff SR |
817 | /* |
818 | * Opening of "enable" adds a ref count to system, | |
819 | * so the name is safe to use. | |
820 | */ | |
821 | if (system) | |
822 | name = system->name; | |
823 | ||
ae63b31e | 824 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
8ae79a13 | 825 | if (ret) |
8f31bfe5 | 826 | goto out; |
8ae79a13 SR |
827 | |
828 | ret = cnt; | |
829 | ||
8f31bfe5 | 830 | out: |
8ae79a13 SR |
831 | *ppos += cnt; |
832 | ||
833 | return ret; | |
834 | } | |
835 | ||
2a37a3df SR |
836 | enum { |
837 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
838 | FORMAT_FIELD_SEPERATOR = 2, |
839 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
840 | }; |
841 | ||
842 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 843 | { |
b86d0ba6 | 844 | struct ftrace_event_call *call = event_file_data(m->private); |
5a65e956 | 845 | struct ftrace_event_field *field; |
86397dc3 LZ |
846 | struct list_head *common_head = &ftrace_common_fields; |
847 | struct list_head *head = trace_get_fields(call); | |
981d081e | 848 | |
2a37a3df | 849 | (*pos)++; |
5a65e956 | 850 | |
2a37a3df SR |
851 | switch ((unsigned long)v) { |
852 | case FORMAT_HEADER: | |
86397dc3 LZ |
853 | if (unlikely(list_empty(common_head))) |
854 | return NULL; | |
855 | ||
856 | field = list_entry(common_head->prev, | |
857 | struct ftrace_event_field, link); | |
858 | return field; | |
5a65e956 | 859 | |
86397dc3 | 860 | case FORMAT_FIELD_SEPERATOR: |
2a37a3df SR |
861 | if (unlikely(list_empty(head))) |
862 | return NULL; | |
5a65e956 | 863 | |
2a37a3df SR |
864 | field = list_entry(head->prev, struct ftrace_event_field, link); |
865 | return field; | |
5a65e956 | 866 | |
2a37a3df SR |
867 | case FORMAT_PRINTFMT: |
868 | /* all done */ | |
869 | return NULL; | |
5a65e956 LJ |
870 | } |
871 | ||
2a37a3df | 872 | field = v; |
86397dc3 LZ |
873 | if (field->link.prev == common_head) |
874 | return (void *)FORMAT_FIELD_SEPERATOR; | |
875 | else if (field->link.prev == head) | |
2a37a3df SR |
876 | return (void *)FORMAT_PRINTFMT; |
877 | ||
878 | field = list_entry(field->link.prev, struct ftrace_event_field, link); | |
879 | ||
2a37a3df | 880 | return field; |
8728fe50 | 881 | } |
5a65e956 | 882 | |
2a37a3df | 883 | static void *f_start(struct seq_file *m, loff_t *pos) |
8728fe50 | 884 | { |
2a37a3df SR |
885 | loff_t l = 0; |
886 | void *p; | |
5a65e956 | 887 | |
b86d0ba6 ON |
888 | /* ->stop() is called even if ->start() fails */ |
889 | mutex_lock(&event_mutex); | |
890 | if (!event_file_data(m->private)) | |
891 | return ERR_PTR(-ENODEV); | |
892 | ||
2a37a3df SR |
893 | /* Start by showing the header */ |
894 | if (!*pos) | |
895 | return (void *)FORMAT_HEADER; | |
896 | ||
897 | p = (void *)FORMAT_HEADER; | |
898 | do { | |
899 | p = f_next(m, p, &l); | |
900 | } while (p && l < *pos); | |
901 | ||
902 | return p; | |
903 | } | |
904 | ||
905 | static int f_show(struct seq_file *m, void *v) | |
906 | { | |
b86d0ba6 | 907 | struct ftrace_event_call *call = event_file_data(m->private); |
2a37a3df SR |
908 | struct ftrace_event_field *field; |
909 | const char *array_descriptor; | |
910 | ||
911 | switch ((unsigned long)v) { | |
912 | case FORMAT_HEADER: | |
913 | seq_printf(m, "name: %s\n", call->name); | |
914 | seq_printf(m, "ID: %d\n", call->event.type); | |
915 | seq_printf(m, "format:\n"); | |
8728fe50 | 916 | return 0; |
5a65e956 | 917 | |
86397dc3 LZ |
918 | case FORMAT_FIELD_SEPERATOR: |
919 | seq_putc(m, '\n'); | |
920 | return 0; | |
921 | ||
2a37a3df SR |
922 | case FORMAT_PRINTFMT: |
923 | seq_printf(m, "\nprint fmt: %s\n", | |
924 | call->print_fmt); | |
925 | return 0; | |
981d081e | 926 | } |
8728fe50 | 927 | |
2a37a3df | 928 | field = v; |
8728fe50 | 929 | |
2a37a3df SR |
930 | /* |
931 | * Smartly shows the array type(except dynamic array). | |
932 | * Normal: | |
933 | * field:TYPE VAR | |
934 | * If TYPE := TYPE[LEN], it is shown: | |
935 | * field:TYPE VAR[LEN] | |
936 | */ | |
937 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 938 | |
2a37a3df SR |
939 | if (!strncmp(field->type, "__data_loc", 10)) |
940 | array_descriptor = NULL; | |
8728fe50 | 941 | |
2a37a3df SR |
942 | if (!array_descriptor) |
943 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
944 | field->type, field->name, field->offset, | |
945 | field->size, !!field->is_signed); | |
946 | else | |
947 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
948 | (int)(array_descriptor - field->type), | |
949 | field->type, field->name, | |
950 | array_descriptor, field->offset, | |
951 | field->size, !!field->is_signed); | |
8728fe50 | 952 | |
2a37a3df SR |
953 | return 0; |
954 | } | |
5a65e956 | 955 | |
2a37a3df SR |
956 | static void f_stop(struct seq_file *m, void *p) |
957 | { | |
b86d0ba6 | 958 | mutex_unlock(&event_mutex); |
2a37a3df | 959 | } |
981d081e | 960 | |
2a37a3df SR |
961 | static const struct seq_operations trace_format_seq_ops = { |
962 | .start = f_start, | |
963 | .next = f_next, | |
964 | .stop = f_stop, | |
965 | .show = f_show, | |
966 | }; | |
967 | ||
968 | static int trace_format_open(struct inode *inode, struct file *file) | |
969 | { | |
2a37a3df SR |
970 | struct seq_file *m; |
971 | int ret; | |
972 | ||
973 | ret = seq_open(file, &trace_format_seq_ops); | |
974 | if (ret < 0) | |
975 | return ret; | |
976 | ||
977 | m = file->private_data; | |
b86d0ba6 | 978 | m->private = file; |
2a37a3df SR |
979 | |
980 | return 0; | |
981d081e SR |
981 | } |
982 | ||
23725aee PZ |
983 | static ssize_t |
984 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
985 | { | |
fdb65fe2 | 986 | int id = (long)event_file_data(filp); |
23725aee PZ |
987 | struct trace_seq *s; |
988 | int r; | |
989 | ||
990 | if (*ppos) | |
991 | return 0; | |
992 | ||
fdb65fe2 ON |
993 | if (unlikely(!id)) |
994 | return -ENODEV; | |
995 | ||
23725aee PZ |
996 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
997 | if (!s) | |
998 | return -ENOMEM; | |
999 | ||
1000 | trace_seq_init(s); | |
fdb65fe2 | 1001 | trace_seq_printf(s, "%d\n", id); |
23725aee PZ |
1002 | |
1003 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
1004 | s->buffer, s->len); | |
1005 | kfree(s); | |
1006 | return r; | |
1007 | } | |
1008 | ||
7ce7e424 TZ |
1009 | static ssize_t |
1010 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1011 | loff_t *ppos) | |
1012 | { | |
70c91fb9 | 1013 | struct ftrace_event_call *call; |
7ce7e424 | 1014 | struct trace_seq *s; |
70c91fb9 | 1015 | int r = -ENODEV; |
7ce7e424 TZ |
1016 | |
1017 | if (*ppos) | |
1018 | return 0; | |
1019 | ||
1020 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
70c91fb9 | 1021 | |
7ce7e424 TZ |
1022 | if (!s) |
1023 | return -ENOMEM; | |
1024 | ||
1025 | trace_seq_init(s); | |
1026 | ||
70c91fb9 ON |
1027 | mutex_lock(&event_mutex); |
1028 | call = event_file_data(filp); | |
1029 | if (call) | |
1030 | print_event_filter(call, s); | |
1031 | mutex_unlock(&event_mutex); | |
1032 | ||
1033 | if (call) | |
1034 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
7ce7e424 TZ |
1035 | |
1036 | kfree(s); | |
1037 | ||
1038 | return r; | |
1039 | } | |
1040 | ||
1041 | static ssize_t | |
1042 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1043 | loff_t *ppos) | |
1044 | { | |
70c91fb9 | 1045 | struct ftrace_event_call *call; |
8b372562 | 1046 | char *buf; |
70c91fb9 | 1047 | int err = -ENODEV; |
7ce7e424 | 1048 | |
8b372562 | 1049 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
1050 | return -EINVAL; |
1051 | ||
8b372562 TZ |
1052 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
1053 | if (!buf) | |
7ce7e424 TZ |
1054 | return -ENOMEM; |
1055 | ||
8b372562 TZ |
1056 | if (copy_from_user(buf, ubuf, cnt)) { |
1057 | free_page((unsigned long) buf); | |
1058 | return -EFAULT; | |
7ce7e424 | 1059 | } |
8b372562 | 1060 | buf[cnt] = '\0'; |
7ce7e424 | 1061 | |
70c91fb9 ON |
1062 | mutex_lock(&event_mutex); |
1063 | call = event_file_data(filp); | |
1064 | if (call) | |
1065 | err = apply_event_filter(call, buf); | |
1066 | mutex_unlock(&event_mutex); | |
1067 | ||
8b372562 TZ |
1068 | free_page((unsigned long) buf); |
1069 | if (err < 0) | |
44e9c8b7 | 1070 | return err; |
0a19e53c | 1071 | |
7ce7e424 TZ |
1072 | *ppos += cnt; |
1073 | ||
1074 | return cnt; | |
1075 | } | |
1076 | ||
e9dbfae5 SR |
1077 | static LIST_HEAD(event_subsystems); |
1078 | ||
1079 | static int subsystem_open(struct inode *inode, struct file *filp) | |
1080 | { | |
1081 | struct event_subsystem *system = NULL; | |
ae63b31e SR |
1082 | struct ftrace_subsystem_dir *dir = NULL; /* Initialize for gcc */ |
1083 | struct trace_array *tr; | |
e9dbfae5 SR |
1084 | int ret; |
1085 | ||
1086 | /* Make sure the system still exists */ | |
9713f785 | 1087 | mutex_lock(&trace_types_lock); |
e9dbfae5 | 1088 | mutex_lock(&event_mutex); |
ae63b31e SR |
1089 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
1090 | list_for_each_entry(dir, &tr->systems, list) { | |
1091 | if (dir == inode->i_private) { | |
1092 | /* Don't open systems with no events */ | |
1093 | if (dir->nr_events) { | |
1094 | __get_system_dir(dir); | |
1095 | system = dir->subsystem; | |
1096 | } | |
1097 | goto exit_loop; | |
e9dbfae5 | 1098 | } |
e9dbfae5 SR |
1099 | } |
1100 | } | |
ae63b31e | 1101 | exit_loop: |
e9dbfae5 | 1102 | mutex_unlock(&event_mutex); |
9713f785 | 1103 | mutex_unlock(&trace_types_lock); |
e9dbfae5 | 1104 | |
ae63b31e | 1105 | if (!system) |
e9dbfae5 SR |
1106 | return -ENODEV; |
1107 | ||
ae63b31e SR |
1108 | /* Some versions of gcc think dir can be uninitialized here */ |
1109 | WARN_ON(!dir); | |
1110 | ||
fc82a11a SRRH |
1111 | /* Still need to increment the ref count of the system */ |
1112 | if (trace_array_get(tr) < 0) { | |
1113 | put_system(dir); | |
1114 | return -ENODEV; | |
1115 | } | |
1116 | ||
e9dbfae5 | 1117 | ret = tracing_open_generic(inode, filp); |
fc82a11a SRRH |
1118 | if (ret < 0) { |
1119 | trace_array_put(tr); | |
ae63b31e | 1120 | put_system(dir); |
fc82a11a | 1121 | } |
ae63b31e SR |
1122 | |
1123 | return ret; | |
1124 | } | |
1125 | ||
1126 | static int system_tr_open(struct inode *inode, struct file *filp) | |
1127 | { | |
1128 | struct ftrace_subsystem_dir *dir; | |
1129 | struct trace_array *tr = inode->i_private; | |
1130 | int ret; | |
1131 | ||
fc82a11a SRRH |
1132 | if (trace_array_get(tr) < 0) |
1133 | return -ENODEV; | |
1134 | ||
ae63b31e SR |
1135 | /* Make a temporary dir that has no system but points to tr */ |
1136 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); | |
fc82a11a SRRH |
1137 | if (!dir) { |
1138 | trace_array_put(tr); | |
ae63b31e | 1139 | return -ENOMEM; |
fc82a11a | 1140 | } |
ae63b31e SR |
1141 | |
1142 | dir->tr = tr; | |
1143 | ||
1144 | ret = tracing_open_generic(inode, filp); | |
fc82a11a SRRH |
1145 | if (ret < 0) { |
1146 | trace_array_put(tr); | |
ae63b31e | 1147 | kfree(dir); |
fc82a11a | 1148 | } |
ae63b31e SR |
1149 | |
1150 | filp->private_data = dir; | |
e9dbfae5 SR |
1151 | |
1152 | return ret; | |
1153 | } | |
1154 | ||
1155 | static int subsystem_release(struct inode *inode, struct file *file) | |
1156 | { | |
ae63b31e | 1157 | struct ftrace_subsystem_dir *dir = file->private_data; |
e9dbfae5 | 1158 | |
fc82a11a SRRH |
1159 | trace_array_put(dir->tr); |
1160 | ||
ae63b31e SR |
1161 | /* |
1162 | * If dir->subsystem is NULL, then this is a temporary | |
1163 | * descriptor that was made for a trace_array to enable | |
1164 | * all subsystems. | |
1165 | */ | |
1166 | if (dir->subsystem) | |
1167 | put_system(dir); | |
1168 | else | |
1169 | kfree(dir); | |
e9dbfae5 SR |
1170 | |
1171 | return 0; | |
1172 | } | |
1173 | ||
cfb180f3 TZ |
1174 | static ssize_t |
1175 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1176 | loff_t *ppos) | |
1177 | { | |
ae63b31e SR |
1178 | struct ftrace_subsystem_dir *dir = filp->private_data; |
1179 | struct event_subsystem *system = dir->subsystem; | |
cfb180f3 TZ |
1180 | struct trace_seq *s; |
1181 | int r; | |
1182 | ||
1183 | if (*ppos) | |
1184 | return 0; | |
1185 | ||
1186 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1187 | if (!s) | |
1188 | return -ENOMEM; | |
1189 | ||
1190 | trace_seq_init(s); | |
1191 | ||
8b372562 | 1192 | print_subsystem_event_filter(system, s); |
4bda2d51 | 1193 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
1194 | |
1195 | kfree(s); | |
1196 | ||
1197 | return r; | |
1198 | } | |
1199 | ||
1200 | static ssize_t | |
1201 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1202 | loff_t *ppos) | |
1203 | { | |
ae63b31e | 1204 | struct ftrace_subsystem_dir *dir = filp->private_data; |
8b372562 | 1205 | char *buf; |
cfb180f3 TZ |
1206 | int err; |
1207 | ||
8b372562 | 1208 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
1209 | return -EINVAL; |
1210 | ||
8b372562 TZ |
1211 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
1212 | if (!buf) | |
cfb180f3 TZ |
1213 | return -ENOMEM; |
1214 | ||
8b372562 TZ |
1215 | if (copy_from_user(buf, ubuf, cnt)) { |
1216 | free_page((unsigned long) buf); | |
1217 | return -EFAULT; | |
cfb180f3 | 1218 | } |
8b372562 | 1219 | buf[cnt] = '\0'; |
cfb180f3 | 1220 | |
ae63b31e | 1221 | err = apply_subsystem_event_filter(dir, buf); |
8b372562 TZ |
1222 | free_page((unsigned long) buf); |
1223 | if (err < 0) | |
44e9c8b7 | 1224 | return err; |
cfb180f3 TZ |
1225 | |
1226 | *ppos += cnt; | |
1227 | ||
1228 | return cnt; | |
1229 | } | |
1230 | ||
d1b182a8 SR |
1231 | static ssize_t |
1232 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1233 | { | |
1234 | int (*func)(struct trace_seq *s) = filp->private_data; | |
1235 | struct trace_seq *s; | |
1236 | int r; | |
1237 | ||
1238 | if (*ppos) | |
1239 | return 0; | |
1240 | ||
1241 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1242 | if (!s) | |
1243 | return -ENOMEM; | |
1244 | ||
1245 | trace_seq_init(s); | |
1246 | ||
1247 | func(s); | |
1248 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
1249 | ||
1250 | kfree(s); | |
1251 | ||
1252 | return r; | |
1253 | } | |
1254 | ||
15075cac SR |
1255 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
1256 | static int ftrace_event_set_open(struct inode *inode, struct file *file); | |
e45ccd09 | 1257 | static int ftrace_event_release(struct inode *inode, struct file *file); |
15075cac | 1258 | |
b77e38aa SR |
1259 | static const struct seq_operations show_event_seq_ops = { |
1260 | .start = t_start, | |
1261 | .next = t_next, | |
1262 | .show = t_show, | |
1263 | .stop = t_stop, | |
1264 | }; | |
1265 | ||
1266 | static const struct seq_operations show_set_event_seq_ops = { | |
1267 | .start = s_start, | |
1268 | .next = s_next, | |
1269 | .show = t_show, | |
1270 | .stop = t_stop, | |
1271 | }; | |
1272 | ||
2314c4ae | 1273 | static const struct file_operations ftrace_avail_fops = { |
15075cac | 1274 | .open = ftrace_event_avail_open, |
2314c4ae SR |
1275 | .read = seq_read, |
1276 | .llseek = seq_lseek, | |
1277 | .release = seq_release, | |
1278 | }; | |
1279 | ||
b77e38aa | 1280 | static const struct file_operations ftrace_set_event_fops = { |
15075cac | 1281 | .open = ftrace_event_set_open, |
b77e38aa SR |
1282 | .read = seq_read, |
1283 | .write = ftrace_event_write, | |
1284 | .llseek = seq_lseek, | |
e45ccd09 | 1285 | .release = ftrace_event_release, |
b77e38aa SR |
1286 | }; |
1287 | ||
1473e441 | 1288 | static const struct file_operations ftrace_enable_fops = { |
012dc156 | 1289 | .open = tracing_open_generic, |
1473e441 SR |
1290 | .read = event_enable_read, |
1291 | .write = event_enable_write, | |
6038f373 | 1292 | .llseek = default_llseek, |
1473e441 SR |
1293 | }; |
1294 | ||
981d081e | 1295 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
1296 | .open = trace_format_open, |
1297 | .read = seq_read, | |
1298 | .llseek = seq_lseek, | |
1299 | .release = seq_release, | |
981d081e SR |
1300 | }; |
1301 | ||
23725aee | 1302 | static const struct file_operations ftrace_event_id_fops = { |
23725aee | 1303 | .read = event_id_read, |
6038f373 | 1304 | .llseek = default_llseek, |
23725aee PZ |
1305 | }; |
1306 | ||
7ce7e424 TZ |
1307 | static const struct file_operations ftrace_event_filter_fops = { |
1308 | .open = tracing_open_generic, | |
1309 | .read = event_filter_read, | |
1310 | .write = event_filter_write, | |
6038f373 | 1311 | .llseek = default_llseek, |
7ce7e424 TZ |
1312 | }; |
1313 | ||
cfb180f3 | 1314 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 1315 | .open = subsystem_open, |
cfb180f3 TZ |
1316 | .read = subsystem_filter_read, |
1317 | .write = subsystem_filter_write, | |
6038f373 | 1318 | .llseek = default_llseek, |
e9dbfae5 | 1319 | .release = subsystem_release, |
cfb180f3 TZ |
1320 | }; |
1321 | ||
8ae79a13 | 1322 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 1323 | .open = subsystem_open, |
8ae79a13 SR |
1324 | .read = system_enable_read, |
1325 | .write = system_enable_write, | |
6038f373 | 1326 | .llseek = default_llseek, |
40ee4dff | 1327 | .release = subsystem_release, |
8ae79a13 SR |
1328 | }; |
1329 | ||
ae63b31e SR |
1330 | static const struct file_operations ftrace_tr_enable_fops = { |
1331 | .open = system_tr_open, | |
1332 | .read = system_enable_read, | |
1333 | .write = system_enable_write, | |
1334 | .llseek = default_llseek, | |
1335 | .release = subsystem_release, | |
1336 | }; | |
1337 | ||
d1b182a8 SR |
1338 | static const struct file_operations ftrace_show_header_fops = { |
1339 | .open = tracing_open_generic, | |
1340 | .read = show_header, | |
6038f373 | 1341 | .llseek = default_llseek, |
d1b182a8 SR |
1342 | }; |
1343 | ||
ae63b31e SR |
1344 | static int |
1345 | ftrace_event_open(struct inode *inode, struct file *file, | |
1346 | const struct seq_operations *seq_ops) | |
1473e441 | 1347 | { |
ae63b31e SR |
1348 | struct seq_file *m; |
1349 | int ret; | |
1473e441 | 1350 | |
ae63b31e SR |
1351 | ret = seq_open(file, seq_ops); |
1352 | if (ret < 0) | |
1353 | return ret; | |
1354 | m = file->private_data; | |
1355 | /* copy tr over to seq ops */ | |
1356 | m->private = inode->i_private; | |
1473e441 | 1357 | |
ae63b31e | 1358 | return ret; |
1473e441 SR |
1359 | } |
1360 | ||
e45ccd09 AL |
1361 | static int ftrace_event_release(struct inode *inode, struct file *file) |
1362 | { | |
1363 | struct trace_array *tr = inode->i_private; | |
1364 | ||
1365 | trace_array_put(tr); | |
1366 | ||
1367 | return seq_release(inode, file); | |
1368 | } | |
1369 | ||
15075cac SR |
1370 | static int |
1371 | ftrace_event_avail_open(struct inode *inode, struct file *file) | |
1372 | { | |
1373 | const struct seq_operations *seq_ops = &show_event_seq_ops; | |
1374 | ||
ae63b31e | 1375 | return ftrace_event_open(inode, file, seq_ops); |
15075cac SR |
1376 | } |
1377 | ||
1378 | static int | |
1379 | ftrace_event_set_open(struct inode *inode, struct file *file) | |
1380 | { | |
1381 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; | |
ae63b31e | 1382 | struct trace_array *tr = inode->i_private; |
e45ccd09 AL |
1383 | int ret; |
1384 | ||
1385 | if (trace_array_get(tr) < 0) | |
1386 | return -ENODEV; | |
15075cac SR |
1387 | |
1388 | if ((file->f_mode & FMODE_WRITE) && | |
1389 | (file->f_flags & O_TRUNC)) | |
ae63b31e | 1390 | ftrace_clear_events(tr); |
15075cac | 1391 | |
e45ccd09 AL |
1392 | ret = ftrace_event_open(inode, file, seq_ops); |
1393 | if (ret < 0) | |
1394 | trace_array_put(tr); | |
1395 | return ret; | |
ae63b31e SR |
1396 | } |
1397 | ||
1398 | static struct event_subsystem * | |
1399 | create_new_subsystem(const char *name) | |
1400 | { | |
1401 | struct event_subsystem *system; | |
1402 | ||
1403 | /* need to create new entry */ | |
1404 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1405 | if (!system) | |
1406 | return NULL; | |
1407 | ||
1408 | system->ref_count = 1; | |
e6929efa SR |
1409 | |
1410 | /* Only allocate if dynamic (kprobes and modules) */ | |
1411 | if (!core_kernel_data((unsigned long)name)) { | |
1412 | system->ref_count |= SYSTEM_FL_FREE_NAME; | |
1413 | system->name = kstrdup(name, GFP_KERNEL); | |
1414 | if (!system->name) | |
1415 | goto out_free; | |
1416 | } else | |
1417 | system->name = name; | |
ae63b31e SR |
1418 | |
1419 | system->filter = NULL; | |
1420 | ||
1421 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); | |
1422 | if (!system->filter) | |
1423 | goto out_free; | |
1424 | ||
1425 | list_add(&system->list, &event_subsystems); | |
1426 | ||
1427 | return system; | |
1428 | ||
1429 | out_free: | |
e6929efa SR |
1430 | if (system->ref_count & SYSTEM_FL_FREE_NAME) |
1431 | kfree(system->name); | |
ae63b31e SR |
1432 | kfree(system); |
1433 | return NULL; | |
15075cac SR |
1434 | } |
1435 | ||
6ecc2d1c | 1436 | static struct dentry * |
ae63b31e SR |
1437 | event_subsystem_dir(struct trace_array *tr, const char *name, |
1438 | struct ftrace_event_file *file, struct dentry *parent) | |
6ecc2d1c | 1439 | { |
ae63b31e | 1440 | struct ftrace_subsystem_dir *dir; |
6ecc2d1c | 1441 | struct event_subsystem *system; |
e1112b4d | 1442 | struct dentry *entry; |
6ecc2d1c SR |
1443 | |
1444 | /* First see if we did not already create this dir */ | |
ae63b31e SR |
1445 | list_for_each_entry(dir, &tr->systems, list) { |
1446 | system = dir->subsystem; | |
dc82ec98 | 1447 | if (strcmp(system->name, name) == 0) { |
ae63b31e SR |
1448 | dir->nr_events++; |
1449 | file->system = dir; | |
1450 | return dir->entry; | |
dc82ec98 | 1451 | } |
6ecc2d1c SR |
1452 | } |
1453 | ||
ae63b31e SR |
1454 | /* Now see if the system itself exists. */ |
1455 | list_for_each_entry(system, &event_subsystems, list) { | |
1456 | if (strcmp(system->name, name) == 0) | |
1457 | break; | |
6ecc2d1c | 1458 | } |
ae63b31e SR |
1459 | /* Reset system variable when not found */ |
1460 | if (&system->list == &event_subsystems) | |
1461 | system = NULL; | |
6ecc2d1c | 1462 | |
ae63b31e SR |
1463 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
1464 | if (!dir) | |
1465 | goto out_fail; | |
6ecc2d1c | 1466 | |
ae63b31e SR |
1467 | if (!system) { |
1468 | system = create_new_subsystem(name); | |
1469 | if (!system) | |
1470 | goto out_free; | |
1471 | } else | |
1472 | __get_system(system); | |
1473 | ||
1474 | dir->entry = debugfs_create_dir(name, parent); | |
1475 | if (!dir->entry) { | |
1476 | pr_warning("Failed to create system directory %s\n", name); | |
1477 | __put_system(system); | |
1478 | goto out_free; | |
6d723736 SR |
1479 | } |
1480 | ||
ae63b31e SR |
1481 | dir->tr = tr; |
1482 | dir->ref_count = 1; | |
1483 | dir->nr_events = 1; | |
1484 | dir->subsystem = system; | |
1485 | file->system = dir; | |
8b372562 | 1486 | |
ae63b31e | 1487 | entry = debugfs_create_file("filter", 0644, dir->entry, dir, |
e1112b4d | 1488 | &ftrace_subsystem_filter_fops); |
8b372562 TZ |
1489 | if (!entry) { |
1490 | kfree(system->filter); | |
1491 | system->filter = NULL; | |
ae63b31e | 1492 | pr_warning("Could not create debugfs '%s/filter' entry\n", name); |
8b372562 | 1493 | } |
e1112b4d | 1494 | |
ae63b31e | 1495 | trace_create_file("enable", 0644, dir->entry, dir, |
f3f3f009 | 1496 | &ftrace_system_enable_fops); |
8ae79a13 | 1497 | |
ae63b31e SR |
1498 | list_add(&dir->list, &tr->systems); |
1499 | ||
1500 | return dir->entry; | |
1501 | ||
1502 | out_free: | |
1503 | kfree(dir); | |
1504 | out_fail: | |
1505 | /* Only print this message if failed on memory allocation */ | |
1506 | if (!dir || !system) | |
1507 | pr_warning("No memory to create event subsystem %s\n", | |
1508 | name); | |
1509 | return NULL; | |
6ecc2d1c SR |
1510 | } |
1511 | ||
1473e441 | 1512 | static int |
ae63b31e SR |
1513 | event_create_dir(struct dentry *parent, |
1514 | struct ftrace_event_file *file, | |
701970b3 SR |
1515 | const struct file_operations *id, |
1516 | const struct file_operations *enable, | |
1517 | const struct file_operations *filter, | |
1518 | const struct file_operations *format) | |
1473e441 | 1519 | { |
ae63b31e SR |
1520 | struct ftrace_event_call *call = file->event_call; |
1521 | struct trace_array *tr = file->tr; | |
2e33af02 | 1522 | struct list_head *head; |
ae63b31e | 1523 | struct dentry *d_events; |
fd994989 | 1524 | int ret; |
1473e441 | 1525 | |
6ecc2d1c SR |
1526 | /* |
1527 | * If the trace point header did not define TRACE_SYSTEM | |
1528 | * then the system would be called "TRACE_SYSTEM". | |
1529 | */ | |
ae63b31e SR |
1530 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { |
1531 | d_events = event_subsystem_dir(tr, call->class->system, file, parent); | |
1532 | if (!d_events) | |
1533 | return -ENOMEM; | |
1534 | } else | |
1535 | d_events = parent; | |
1536 | ||
1537 | file->dir = debugfs_create_dir(call->name, d_events); | |
1538 | if (!file->dir) { | |
1539 | pr_warning("Could not create debugfs '%s' directory\n", | |
1540 | call->name); | |
1473e441 SR |
1541 | return -1; |
1542 | } | |
1543 | ||
9b63776f | 1544 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
ae63b31e | 1545 | trace_create_file("enable", 0644, file->dir, file, |
f3f3f009 | 1546 | enable); |
1473e441 | 1547 | |
2239291a | 1548 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 1549 | if (call->event.type && call->class->reg) |
fdb65fe2 ON |
1550 | trace_create_file("id", 0444, file->dir, |
1551 | (void *)(long)call->event.type, id); | |
2239291a | 1552 | #endif |
23725aee | 1553 | |
c9d932cf LZ |
1554 | /* |
1555 | * Other events may have the same class. Only update | |
1556 | * the fields if they are not already defined. | |
1557 | */ | |
1558 | head = trace_get_fields(call); | |
1559 | if (list_empty(head)) { | |
1560 | ret = call->class->define_fields(call); | |
1561 | if (ret < 0) { | |
1562 | pr_warning("Could not initialize trace point" | |
1563 | " events/%s\n", call->name); | |
ae63b31e | 1564 | return -1; |
cf027f64 TZ |
1565 | } |
1566 | } | |
ae63b31e | 1567 | trace_create_file("filter", 0644, file->dir, call, |
c9d932cf | 1568 | filter); |
cf027f64 | 1569 | |
ae63b31e | 1570 | trace_create_file("format", 0444, file->dir, call, |
f3f3f009 | 1571 | format); |
6d723736 SR |
1572 | |
1573 | return 0; | |
1574 | } | |
1575 | ||
ae63b31e SR |
1576 | static void remove_event_from_tracers(struct ftrace_event_call *call) |
1577 | { | |
1578 | struct ftrace_event_file *file; | |
1579 | struct trace_array *tr; | |
1580 | ||
1581 | do_for_each_event_file_safe(tr, file) { | |
ae63b31e SR |
1582 | if (file->event_call != call) |
1583 | continue; | |
1584 | ||
c6febdf2 | 1585 | remove_event_file_dir(file); |
ae63b31e SR |
1586 | /* |
1587 | * The do_for_each_event_file_safe() is | |
1588 | * a double loop. After finding the call for this | |
1589 | * trace_array, we use break to jump to the next | |
1590 | * trace_array. | |
1591 | */ | |
1592 | break; | |
1593 | } while_for_each_event_file(); | |
1594 | } | |
1595 | ||
8781915a EG |
1596 | static void event_remove(struct ftrace_event_call *call) |
1597 | { | |
ae63b31e SR |
1598 | struct trace_array *tr; |
1599 | struct ftrace_event_file *file; | |
1600 | ||
1601 | do_for_each_event_file(tr, file) { | |
1602 | if (file->event_call != call) | |
1603 | continue; | |
1604 | ftrace_event_enable_disable(file, 0); | |
1605 | /* | |
1606 | * The do_for_each_event_file() is | |
1607 | * a double loop. After finding the call for this | |
1608 | * trace_array, we use break to jump to the next | |
1609 | * trace_array. | |
1610 | */ | |
1611 | break; | |
1612 | } while_for_each_event_file(); | |
1613 | ||
8781915a EG |
1614 | if (call->event.funcs) |
1615 | __unregister_ftrace_event(&call->event); | |
ae63b31e | 1616 | remove_event_from_tracers(call); |
8781915a EG |
1617 | list_del(&call->list); |
1618 | } | |
1619 | ||
1620 | static int event_init(struct ftrace_event_call *call) | |
1621 | { | |
1622 | int ret = 0; | |
1623 | ||
1624 | if (WARN_ON(!call->name)) | |
1625 | return -EINVAL; | |
1626 | ||
1627 | if (call->class->raw_init) { | |
1628 | ret = call->class->raw_init(call); | |
1629 | if (ret < 0 && ret != -ENOSYS) | |
1630 | pr_warn("Could not initialize trace events/%s\n", | |
1631 | call->name); | |
1632 | } | |
1633 | ||
1634 | return ret; | |
1635 | } | |
1636 | ||
67ead0a6 | 1637 | static int |
ae63b31e | 1638 | __register_event(struct ftrace_event_call *call, struct module *mod) |
bd1a5c84 | 1639 | { |
bd1a5c84 | 1640 | int ret; |
6d723736 | 1641 | |
8781915a EG |
1642 | ret = event_init(call); |
1643 | if (ret < 0) | |
1644 | return ret; | |
701970b3 | 1645 | |
ae63b31e | 1646 | list_add(&call->list, &ftrace_events); |
67ead0a6 | 1647 | call->mod = mod; |
88f70d75 | 1648 | |
ae63b31e | 1649 | return 0; |
bd1a5c84 MH |
1650 | } |
1651 | ||
da511bf3 SRRH |
1652 | static struct ftrace_event_file * |
1653 | trace_create_new_event(struct ftrace_event_call *call, | |
1654 | struct trace_array *tr) | |
1655 | { | |
1656 | struct ftrace_event_file *file; | |
1657 | ||
1658 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); | |
1659 | if (!file) | |
1660 | return NULL; | |
1661 | ||
1662 | file->event_call = call; | |
1663 | file->tr = tr; | |
1664 | atomic_set(&file->sm_ref, 0); | |
1665 | list_add(&file->list, &tr->events); | |
1666 | ||
1667 | return file; | |
1668 | } | |
1669 | ||
ae63b31e SR |
1670 | /* Add an event to a trace directory */ |
1671 | static int | |
1672 | __trace_add_new_event(struct ftrace_event_call *call, | |
1673 | struct trace_array *tr, | |
1674 | const struct file_operations *id, | |
1675 | const struct file_operations *enable, | |
1676 | const struct file_operations *filter, | |
1677 | const struct file_operations *format) | |
1678 | { | |
1679 | struct ftrace_event_file *file; | |
1680 | ||
da511bf3 | 1681 | file = trace_create_new_event(call, tr); |
ae63b31e SR |
1682 | if (!file) |
1683 | return -ENOMEM; | |
1684 | ||
ae63b31e SR |
1685 | return event_create_dir(tr->event_dir, file, id, enable, filter, format); |
1686 | } | |
1687 | ||
77248221 SR |
1688 | /* |
1689 | * Just create a decriptor for early init. A descriptor is required | |
1690 | * for enabling events at boot. We want to enable events before | |
1691 | * the filesystem is initialized. | |
1692 | */ | |
1693 | static __init int | |
1694 | __trace_early_add_new_event(struct ftrace_event_call *call, | |
1695 | struct trace_array *tr) | |
1696 | { | |
1697 | struct ftrace_event_file *file; | |
1698 | ||
da511bf3 | 1699 | file = trace_create_new_event(call, tr); |
77248221 SR |
1700 | if (!file) |
1701 | return -ENOMEM; | |
1702 | ||
77248221 SR |
1703 | return 0; |
1704 | } | |
1705 | ||
ae63b31e SR |
1706 | struct ftrace_module_file_ops; |
1707 | static void __add_event_to_tracers(struct ftrace_event_call *call, | |
1708 | struct ftrace_module_file_ops *file_ops); | |
1709 | ||
bd1a5c84 MH |
1710 | /* Add an additional event_call dynamically */ |
1711 | int trace_add_event_call(struct ftrace_event_call *call) | |
1712 | { | |
1713 | int ret; | |
9713f785 | 1714 | mutex_lock(&trace_types_lock); |
bd1a5c84 | 1715 | mutex_lock(&event_mutex); |
701970b3 | 1716 | |
ae63b31e SR |
1717 | ret = __register_event(call, NULL); |
1718 | if (ret >= 0) | |
1719 | __add_event_to_tracers(call, NULL); | |
a2ca5e03 | 1720 | |
ae63b31e | 1721 | mutex_unlock(&event_mutex); |
9713f785 | 1722 | mutex_unlock(&trace_types_lock); |
ae63b31e | 1723 | return ret; |
a2ca5e03 FW |
1724 | } |
1725 | ||
4fead8e4 | 1726 | /* |
9713f785 AL |
1727 | * Must be called under locking of trace_types_lock, event_mutex and |
1728 | * trace_event_sem. | |
4fead8e4 | 1729 | */ |
bd1a5c84 MH |
1730 | static void __trace_remove_event_call(struct ftrace_event_call *call) |
1731 | { | |
8781915a | 1732 | event_remove(call); |
bd1a5c84 MH |
1733 | trace_destroy_fields(call); |
1734 | destroy_preds(call); | |
bd1a5c84 MH |
1735 | } |
1736 | ||
8169887b ON |
1737 | static int probe_remove_event_call(struct ftrace_event_call *call) |
1738 | { | |
1739 | struct trace_array *tr; | |
1740 | struct ftrace_event_file *file; | |
1741 | ||
1742 | #ifdef CONFIG_PERF_EVENTS | |
1743 | if (call->perf_refcount) | |
1744 | return -EBUSY; | |
1745 | #endif | |
1746 | do_for_each_event_file(tr, file) { | |
1747 | if (file->event_call != call) | |
1748 | continue; | |
1749 | /* | |
1750 | * We can't rely on ftrace_event_enable_disable(enable => 0) | |
1751 | * we are going to do, FTRACE_EVENT_FL_SOFT_MODE can suppress | |
1752 | * TRACE_REG_UNREGISTER. | |
1753 | */ | |
1754 | if (file->flags & FTRACE_EVENT_FL_ENABLED) | |
1755 | return -EBUSY; | |
1756 | break; | |
1757 | } while_for_each_event_file(); | |
1758 | ||
1759 | __trace_remove_event_call(call); | |
1760 | ||
1761 | return 0; | |
1762 | } | |
1763 | ||
bd1a5c84 | 1764 | /* Remove an event_call */ |
8169887b | 1765 | int trace_remove_event_call(struct ftrace_event_call *call) |
bd1a5c84 | 1766 | { |
8169887b ON |
1767 | int ret; |
1768 | ||
9713f785 | 1769 | mutex_lock(&trace_types_lock); |
bd1a5c84 | 1770 | mutex_lock(&event_mutex); |
52f6ad6d | 1771 | down_write(&trace_event_sem); |
8169887b | 1772 | ret = probe_remove_event_call(call); |
52f6ad6d | 1773 | up_write(&trace_event_sem); |
bd1a5c84 | 1774 | mutex_unlock(&event_mutex); |
9713f785 | 1775 | mutex_unlock(&trace_types_lock); |
8169887b ON |
1776 | |
1777 | return ret; | |
bd1a5c84 MH |
1778 | } |
1779 | ||
1780 | #define for_each_event(event, start, end) \ | |
1781 | for (event = start; \ | |
1782 | (unsigned long)event < (unsigned long)end; \ | |
1783 | event++) | |
1784 | ||
1785 | #ifdef CONFIG_MODULES | |
1786 | ||
1787 | static LIST_HEAD(ftrace_module_file_list); | |
1788 | ||
1789 | /* | |
1790 | * Modules must own their file_operations to keep up with | |
1791 | * reference counting. | |
1792 | */ | |
1793 | struct ftrace_module_file_ops { | |
1794 | struct list_head list; | |
1795 | struct module *mod; | |
1796 | struct file_operations id; | |
1797 | struct file_operations enable; | |
1798 | struct file_operations format; | |
1799 | struct file_operations filter; | |
1800 | }; | |
1801 | ||
315326c1 SRRH |
1802 | static struct ftrace_module_file_ops * |
1803 | find_ftrace_file_ops(struct ftrace_module_file_ops *file_ops, struct module *mod) | |
ae63b31e | 1804 | { |
315326c1 SRRH |
1805 | /* |
1806 | * As event_calls are added in groups by module, | |
1807 | * when we find one file_ops, we don't need to search for | |
1808 | * each call in that module, as the rest should be the | |
1809 | * same. Only search for a new one if the last one did | |
1810 | * not match. | |
1811 | */ | |
1812 | if (file_ops && mod == file_ops->mod) | |
1813 | return file_ops; | |
ae63b31e SR |
1814 | |
1815 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1816 | if (file_ops->mod == mod) | |
1817 | return file_ops; | |
1818 | } | |
1819 | return NULL; | |
1820 | } | |
1821 | ||
701970b3 SR |
1822 | static struct ftrace_module_file_ops * |
1823 | trace_create_file_ops(struct module *mod) | |
1824 | { | |
1825 | struct ftrace_module_file_ops *file_ops; | |
1826 | ||
1827 | /* | |
1828 | * This is a bit of a PITA. To allow for correct reference | |
1829 | * counting, modules must "own" their file_operations. | |
1830 | * To do this, we allocate the file operations that will be | |
1831 | * used in the event directory. | |
1832 | */ | |
1833 | ||
1834 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1835 | if (!file_ops) | |
1836 | return NULL; | |
1837 | ||
1838 | file_ops->mod = mod; | |
1839 | ||
1840 | file_ops->id = ftrace_event_id_fops; | |
1841 | file_ops->id.owner = mod; | |
1842 | ||
1843 | file_ops->enable = ftrace_enable_fops; | |
1844 | file_ops->enable.owner = mod; | |
1845 | ||
1846 | file_ops->filter = ftrace_event_filter_fops; | |
1847 | file_ops->filter.owner = mod; | |
1848 | ||
1849 | file_ops->format = ftrace_event_format_fops; | |
1850 | file_ops->format.owner = mod; | |
1851 | ||
1852 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1853 | ||
1854 | return file_ops; | |
1855 | } | |
1856 | ||
6d723736 SR |
1857 | static void trace_module_add_events(struct module *mod) |
1858 | { | |
701970b3 | 1859 | struct ftrace_module_file_ops *file_ops = NULL; |
e4a9ea5e | 1860 | struct ftrace_event_call **call, **start, **end; |
6d723736 | 1861 | |
d6a6d1f3 SRRH |
1862 | if (!mod->num_trace_events) |
1863 | return; | |
1864 | ||
1865 | /* Don't add infrastructure for mods without tracepoints */ | |
1866 | if (trace_module_has_bad_taint(mod)) { | |
1867 | pr_err("%s: module has bad taint, not creating trace events\n", | |
1868 | mod->name); | |
1869 | return; | |
1870 | } | |
1871 | ||
6d723736 SR |
1872 | start = mod->trace_events; |
1873 | end = mod->trace_events + mod->num_trace_events; | |
1874 | ||
1875 | if (start == end) | |
1876 | return; | |
1877 | ||
67ead0a6 LZ |
1878 | file_ops = trace_create_file_ops(mod); |
1879 | if (!file_ops) | |
6d723736 SR |
1880 | return; |
1881 | ||
1882 | for_each_event(call, start, end) { | |
ae63b31e SR |
1883 | __register_event(*call, mod); |
1884 | __add_event_to_tracers(*call, file_ops); | |
6d723736 SR |
1885 | } |
1886 | } | |
1887 | ||
1888 | static void trace_module_remove_events(struct module *mod) | |
1889 | { | |
701970b3 | 1890 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1891 | struct ftrace_event_call *call, *p; |
575380da | 1892 | bool clear_trace = false; |
6d723736 | 1893 | |
52f6ad6d | 1894 | down_write(&trace_event_sem); |
6d723736 SR |
1895 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1896 | if (call->mod == mod) { | |
575380da SRRH |
1897 | if (call->flags & TRACE_EVENT_FL_WAS_ENABLED) |
1898 | clear_trace = true; | |
bd1a5c84 | 1899 | __trace_remove_event_call(call); |
6d723736 SR |
1900 | } |
1901 | } | |
701970b3 SR |
1902 | |
1903 | /* Now free the file_operations */ | |
1904 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1905 | if (file_ops->mod == mod) | |
1906 | break; | |
1907 | } | |
1908 | if (&file_ops->list != &ftrace_module_file_list) { | |
1909 | list_del(&file_ops->list); | |
1910 | kfree(file_ops); | |
1911 | } | |
52f6ad6d | 1912 | up_write(&trace_event_sem); |
9456f0fa SR |
1913 | |
1914 | /* | |
1915 | * It is safest to reset the ring buffer if the module being unloaded | |
873c642f SRRH |
1916 | * registered any events that were used. The only worry is if |
1917 | * a new module gets loaded, and takes on the same id as the events | |
1918 | * of this module. When printing out the buffer, traced events left | |
1919 | * over from this module may be passed to the new module events and | |
1920 | * unexpected results may occur. | |
9456f0fa | 1921 | */ |
575380da | 1922 | if (clear_trace) |
873c642f | 1923 | tracing_reset_all_online_cpus(); |
6d723736 SR |
1924 | } |
1925 | ||
61f919a1 SR |
1926 | static int trace_module_notify(struct notifier_block *self, |
1927 | unsigned long val, void *data) | |
6d723736 SR |
1928 | { |
1929 | struct module *mod = data; | |
1930 | ||
9713f785 | 1931 | mutex_lock(&trace_types_lock); |
6d723736 SR |
1932 | mutex_lock(&event_mutex); |
1933 | switch (val) { | |
1934 | case MODULE_STATE_COMING: | |
1935 | trace_module_add_events(mod); | |
1936 | break; | |
1937 | case MODULE_STATE_GOING: | |
1938 | trace_module_remove_events(mod); | |
1939 | break; | |
1940 | } | |
1941 | mutex_unlock(&event_mutex); | |
9713f785 | 1942 | mutex_unlock(&trace_types_lock); |
fd994989 | 1943 | |
1473e441 SR |
1944 | return 0; |
1945 | } | |
315326c1 SRRH |
1946 | |
1947 | static int | |
1948 | __trace_add_new_mod_event(struct ftrace_event_call *call, | |
1949 | struct trace_array *tr, | |
1950 | struct ftrace_module_file_ops *file_ops) | |
1951 | { | |
1952 | return __trace_add_new_event(call, tr, | |
1953 | &file_ops->id, &file_ops->enable, | |
1954 | &file_ops->filter, &file_ops->format); | |
1955 | } | |
1956 | ||
61f919a1 | 1957 | #else |
315326c1 SRRH |
1958 | static inline struct ftrace_module_file_ops * |
1959 | find_ftrace_file_ops(struct ftrace_module_file_ops *file_ops, struct module *mod) | |
ae63b31e SR |
1960 | { |
1961 | return NULL; | |
1962 | } | |
315326c1 SRRH |
1963 | static inline int trace_module_notify(struct notifier_block *self, |
1964 | unsigned long val, void *data) | |
61f919a1 SR |
1965 | { |
1966 | return 0; | |
1967 | } | |
315326c1 SRRH |
1968 | static inline int |
1969 | __trace_add_new_mod_event(struct ftrace_event_call *call, | |
1970 | struct trace_array *tr, | |
1971 | struct ftrace_module_file_ops *file_ops) | |
1972 | { | |
1973 | return -ENODEV; | |
1974 | } | |
61f919a1 | 1975 | #endif /* CONFIG_MODULES */ |
1473e441 | 1976 | |
ae63b31e SR |
1977 | /* Create a new event directory structure for a trace directory. */ |
1978 | static void | |
1979 | __trace_add_event_dirs(struct trace_array *tr) | |
1980 | { | |
1981 | struct ftrace_module_file_ops *file_ops = NULL; | |
1982 | struct ftrace_event_call *call; | |
1983 | int ret; | |
1984 | ||
1985 | list_for_each_entry(call, &ftrace_events, list) { | |
1986 | if (call->mod) { | |
1987 | /* | |
1988 | * Directories for events by modules need to | |
1989 | * keep module ref counts when opened (as we don't | |
1990 | * want the module to disappear when reading one | |
1991 | * of these files). The file_ops keep account of | |
1992 | * the module ref count. | |
ae63b31e | 1993 | */ |
315326c1 | 1994 | file_ops = find_ftrace_file_ops(file_ops, call->mod); |
ae63b31e SR |
1995 | if (!file_ops) |
1996 | continue; /* Warn? */ | |
315326c1 | 1997 | ret = __trace_add_new_mod_event(call, tr, file_ops); |
ae63b31e SR |
1998 | if (ret < 0) |
1999 | pr_warning("Could not create directory for event %s\n", | |
2000 | call->name); | |
2001 | continue; | |
2002 | } | |
2003 | ret = __trace_add_new_event(call, tr, | |
2004 | &ftrace_event_id_fops, | |
2005 | &ftrace_enable_fops, | |
2006 | &ftrace_event_filter_fops, | |
2007 | &ftrace_event_format_fops); | |
2008 | if (ret < 0) | |
2009 | pr_warning("Could not create directory for event %s\n", | |
2010 | call->name); | |
2011 | } | |
2012 | } | |
2013 | ||
3cd715de SRRH |
2014 | #ifdef CONFIG_DYNAMIC_FTRACE |
2015 | ||
2016 | /* Avoid typos */ | |
2017 | #define ENABLE_EVENT_STR "enable_event" | |
2018 | #define DISABLE_EVENT_STR "disable_event" | |
2019 | ||
2020 | struct event_probe_data { | |
2021 | struct ftrace_event_file *file; | |
2022 | unsigned long count; | |
2023 | int ref; | |
2024 | bool enable; | |
2025 | }; | |
2026 | ||
2027 | static struct ftrace_event_file * | |
2028 | find_event_file(struct trace_array *tr, const char *system, const char *event) | |
2029 | { | |
2030 | struct ftrace_event_file *file; | |
2031 | struct ftrace_event_call *call; | |
2032 | ||
2033 | list_for_each_entry(file, &tr->events, list) { | |
2034 | ||
2035 | call = file->event_call; | |
2036 | ||
2037 | if (!call->name || !call->class || !call->class->reg) | |
2038 | continue; | |
2039 | ||
2040 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) | |
2041 | continue; | |
2042 | ||
2043 | if (strcmp(event, call->name) == 0 && | |
2044 | strcmp(system, call->class->system) == 0) | |
2045 | return file; | |
2046 | } | |
2047 | return NULL; | |
2048 | } | |
2049 | ||
2050 | static void | |
2051 | event_enable_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
2052 | { | |
2053 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2054 | struct event_probe_data *data = *pdata; | |
2055 | ||
2056 | if (!data) | |
2057 | return; | |
2058 | ||
2059 | if (data->enable) | |
2060 | clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &data->file->flags); | |
2061 | else | |
2062 | set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &data->file->flags); | |
2063 | } | |
2064 | ||
2065 | static void | |
2066 | event_enable_count_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
2067 | { | |
2068 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2069 | struct event_probe_data *data = *pdata; | |
2070 | ||
2071 | if (!data) | |
2072 | return; | |
2073 | ||
2074 | if (!data->count) | |
2075 | return; | |
2076 | ||
2077 | /* Skip if the event is in a state we want to switch to */ | |
2078 | if (data->enable == !(data->file->flags & FTRACE_EVENT_FL_SOFT_DISABLED)) | |
2079 | return; | |
2080 | ||
2081 | if (data->count != -1) | |
2082 | (data->count)--; | |
2083 | ||
2084 | event_enable_probe(ip, parent_ip, _data); | |
2085 | } | |
2086 | ||
2087 | static int | |
2088 | event_enable_print(struct seq_file *m, unsigned long ip, | |
2089 | struct ftrace_probe_ops *ops, void *_data) | |
2090 | { | |
2091 | struct event_probe_data *data = _data; | |
2092 | ||
2093 | seq_printf(m, "%ps:", (void *)ip); | |
2094 | ||
2095 | seq_printf(m, "%s:%s:%s", | |
2096 | data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR, | |
2097 | data->file->event_call->class->system, | |
2098 | data->file->event_call->name); | |
2099 | ||
2100 | if (data->count == -1) | |
2101 | seq_printf(m, ":unlimited\n"); | |
2102 | else | |
2103 | seq_printf(m, ":count=%ld\n", data->count); | |
2104 | ||
2105 | return 0; | |
2106 | } | |
2107 | ||
2108 | static int | |
2109 | event_enable_init(struct ftrace_probe_ops *ops, unsigned long ip, | |
2110 | void **_data) | |
2111 | { | |
2112 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2113 | struct event_probe_data *data = *pdata; | |
2114 | ||
2115 | data->ref++; | |
2116 | return 0; | |
2117 | } | |
2118 | ||
2119 | static void | |
2120 | event_enable_free(struct ftrace_probe_ops *ops, unsigned long ip, | |
2121 | void **_data) | |
2122 | { | |
2123 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2124 | struct event_probe_data *data = *pdata; | |
2125 | ||
2126 | if (WARN_ON_ONCE(data->ref <= 0)) | |
2127 | return; | |
2128 | ||
2129 | data->ref--; | |
2130 | if (!data->ref) { | |
2131 | /* Remove the SOFT_MODE flag */ | |
2132 | __ftrace_event_enable_disable(data->file, 0, 1); | |
2133 | module_put(data->file->event_call->mod); | |
2134 | kfree(data); | |
2135 | } | |
2136 | *pdata = NULL; | |
2137 | } | |
2138 | ||
2139 | static struct ftrace_probe_ops event_enable_probe_ops = { | |
2140 | .func = event_enable_probe, | |
2141 | .print = event_enable_print, | |
2142 | .init = event_enable_init, | |
2143 | .free = event_enable_free, | |
2144 | }; | |
2145 | ||
2146 | static struct ftrace_probe_ops event_enable_count_probe_ops = { | |
2147 | .func = event_enable_count_probe, | |
2148 | .print = event_enable_print, | |
2149 | .init = event_enable_init, | |
2150 | .free = event_enable_free, | |
2151 | }; | |
2152 | ||
2153 | static struct ftrace_probe_ops event_disable_probe_ops = { | |
2154 | .func = event_enable_probe, | |
2155 | .print = event_enable_print, | |
2156 | .init = event_enable_init, | |
2157 | .free = event_enable_free, | |
2158 | }; | |
2159 | ||
2160 | static struct ftrace_probe_ops event_disable_count_probe_ops = { | |
2161 | .func = event_enable_count_probe, | |
2162 | .print = event_enable_print, | |
2163 | .init = event_enable_init, | |
2164 | .free = event_enable_free, | |
2165 | }; | |
2166 | ||
2167 | static int | |
2168 | event_enable_func(struct ftrace_hash *hash, | |
2169 | char *glob, char *cmd, char *param, int enabled) | |
2170 | { | |
2171 | struct trace_array *tr = top_trace_array(); | |
2172 | struct ftrace_event_file *file; | |
2173 | struct ftrace_probe_ops *ops; | |
2174 | struct event_probe_data *data; | |
2175 | const char *system; | |
2176 | const char *event; | |
2177 | char *number; | |
2178 | bool enable; | |
2179 | int ret; | |
2180 | ||
2181 | /* hash funcs only work with set_ftrace_filter */ | |
2182 | if (!enabled) | |
2183 | return -EINVAL; | |
2184 | ||
2185 | if (!param) | |
2186 | return -EINVAL; | |
2187 | ||
2188 | system = strsep(¶m, ":"); | |
2189 | if (!param) | |
2190 | return -EINVAL; | |
2191 | ||
2192 | event = strsep(¶m, ":"); | |
2193 | ||
2194 | mutex_lock(&event_mutex); | |
2195 | ||
2196 | ret = -EINVAL; | |
2197 | file = find_event_file(tr, system, event); | |
2198 | if (!file) | |
2199 | goto out; | |
2200 | ||
2201 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; | |
2202 | ||
2203 | if (enable) | |
2204 | ops = param ? &event_enable_count_probe_ops : &event_enable_probe_ops; | |
2205 | else | |
2206 | ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops; | |
2207 | ||
2208 | if (glob[0] == '!') { | |
2209 | unregister_ftrace_function_probe_func(glob+1, ops); | |
2210 | ret = 0; | |
2211 | goto out; | |
2212 | } | |
2213 | ||
2214 | ret = -ENOMEM; | |
2215 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
2216 | if (!data) | |
2217 | goto out; | |
2218 | ||
2219 | data->enable = enable; | |
2220 | data->count = -1; | |
2221 | data->file = file; | |
2222 | ||
2223 | if (!param) | |
2224 | goto out_reg; | |
2225 | ||
2226 | number = strsep(¶m, ":"); | |
2227 | ||
2228 | ret = -EINVAL; | |
2229 | if (!strlen(number)) | |
2230 | goto out_free; | |
2231 | ||
2232 | /* | |
2233 | * We use the callback data field (which is a pointer) | |
2234 | * as our counter. | |
2235 | */ | |
2236 | ret = kstrtoul(number, 0, &data->count); | |
2237 | if (ret) | |
2238 | goto out_free; | |
2239 | ||
2240 | out_reg: | |
2241 | /* Don't let event modules unload while probe registered */ | |
2242 | ret = try_module_get(file->event_call->mod); | |
6ed01066 MH |
2243 | if (!ret) { |
2244 | ret = -EBUSY; | |
3cd715de | 2245 | goto out_free; |
6ed01066 | 2246 | } |
3cd715de SRRH |
2247 | |
2248 | ret = __ftrace_event_enable_disable(file, 1, 1); | |
2249 | if (ret < 0) | |
2250 | goto out_put; | |
2251 | ret = register_ftrace_function_probe(glob, ops, data); | |
ff305ded SRRH |
2252 | /* |
2253 | * The above returns on success the # of functions enabled, | |
2254 | * but if it didn't find any functions it returns zero. | |
2255 | * Consider no functions a failure too. | |
2256 | */ | |
a5b85bd1 MH |
2257 | if (!ret) { |
2258 | ret = -ENOENT; | |
3cd715de | 2259 | goto out_disable; |
ff305ded SRRH |
2260 | } else if (ret < 0) |
2261 | goto out_disable; | |
2262 | /* Just return zero, not the number of enabled functions */ | |
2263 | ret = 0; | |
3cd715de SRRH |
2264 | out: |
2265 | mutex_unlock(&event_mutex); | |
2266 | return ret; | |
2267 | ||
2268 | out_disable: | |
2269 | __ftrace_event_enable_disable(file, 0, 1); | |
2270 | out_put: | |
2271 | module_put(file->event_call->mod); | |
2272 | out_free: | |
2273 | kfree(data); | |
2274 | goto out; | |
2275 | } | |
2276 | ||
2277 | static struct ftrace_func_command event_enable_cmd = { | |
2278 | .name = ENABLE_EVENT_STR, | |
2279 | .func = event_enable_func, | |
2280 | }; | |
2281 | ||
2282 | static struct ftrace_func_command event_disable_cmd = { | |
2283 | .name = DISABLE_EVENT_STR, | |
2284 | .func = event_enable_func, | |
2285 | }; | |
2286 | ||
2287 | static __init int register_event_cmds(void) | |
2288 | { | |
2289 | int ret; | |
2290 | ||
2291 | ret = register_ftrace_command(&event_enable_cmd); | |
2292 | if (WARN_ON(ret < 0)) | |
2293 | return ret; | |
2294 | ret = register_ftrace_command(&event_disable_cmd); | |
2295 | if (WARN_ON(ret < 0)) | |
2296 | unregister_ftrace_command(&event_enable_cmd); | |
2297 | return ret; | |
2298 | } | |
2299 | #else | |
2300 | static inline int register_event_cmds(void) { return 0; } | |
2301 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
2302 | ||
77248221 SR |
2303 | /* |
2304 | * The top level array has already had its ftrace_event_file | |
2305 | * descriptors created in order to allow for early events to | |
2306 | * be recorded. This function is called after the debugfs has been | |
2307 | * initialized, and we now have to create the files associated | |
2308 | * to the events. | |
2309 | */ | |
2310 | static __init void | |
2311 | __trace_early_add_event_dirs(struct trace_array *tr) | |
2312 | { | |
2313 | struct ftrace_event_file *file; | |
2314 | int ret; | |
2315 | ||
2316 | ||
2317 | list_for_each_entry(file, &tr->events, list) { | |
2318 | ret = event_create_dir(tr->event_dir, file, | |
2319 | &ftrace_event_id_fops, | |
2320 | &ftrace_enable_fops, | |
2321 | &ftrace_event_filter_fops, | |
2322 | &ftrace_event_format_fops); | |
2323 | if (ret < 0) | |
2324 | pr_warning("Could not create directory for event %s\n", | |
2325 | file->event_call->name); | |
2326 | } | |
2327 | } | |
2328 | ||
2329 | /* | |
2330 | * For early boot up, the top trace array requires to have | |
2331 | * a list of events that can be enabled. This must be done before | |
2332 | * the filesystem is set up in order to allow events to be traced | |
2333 | * early. | |
2334 | */ | |
2335 | static __init void | |
2336 | __trace_early_add_events(struct trace_array *tr) | |
2337 | { | |
2338 | struct ftrace_event_call *call; | |
2339 | int ret; | |
2340 | ||
2341 | list_for_each_entry(call, &ftrace_events, list) { | |
2342 | /* Early boot up should not have any modules loaded */ | |
2343 | if (WARN_ON_ONCE(call->mod)) | |
2344 | continue; | |
2345 | ||
2346 | ret = __trace_early_add_new_event(call, tr); | |
2347 | if (ret < 0) | |
2348 | pr_warning("Could not create early event %s\n", | |
2349 | call->name); | |
2350 | } | |
2351 | } | |
2352 | ||
0c8916c3 SR |
2353 | /* Remove the event directory structure for a trace directory. */ |
2354 | static void | |
2355 | __trace_remove_event_dirs(struct trace_array *tr) | |
2356 | { | |
2357 | struct ftrace_event_file *file, *next; | |
2358 | ||
c6febdf2 ON |
2359 | list_for_each_entry_safe(file, next, &tr->events, list) |
2360 | remove_event_file_dir(file); | |
0c8916c3 SR |
2361 | } |
2362 | ||
ae63b31e SR |
2363 | static void |
2364 | __add_event_to_tracers(struct ftrace_event_call *call, | |
2365 | struct ftrace_module_file_ops *file_ops) | |
2366 | { | |
2367 | struct trace_array *tr; | |
2368 | ||
2369 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
2370 | if (file_ops) | |
315326c1 | 2371 | __trace_add_new_mod_event(call, tr, file_ops); |
ae63b31e SR |
2372 | else |
2373 | __trace_add_new_event(call, tr, | |
2374 | &ftrace_event_id_fops, | |
2375 | &ftrace_enable_fops, | |
2376 | &ftrace_event_filter_fops, | |
2377 | &ftrace_event_format_fops); | |
2378 | } | |
2379 | } | |
2380 | ||
ec827c7e | 2381 | static struct notifier_block trace_module_nb = { |
6d723736 SR |
2382 | .notifier_call = trace_module_notify, |
2383 | .priority = 0, | |
2384 | }; | |
2385 | ||
e4a9ea5e SR |
2386 | extern struct ftrace_event_call *__start_ftrace_events[]; |
2387 | extern struct ftrace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 2388 | |
020e5f85 LZ |
2389 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
2390 | ||
2391 | static __init int setup_trace_event(char *str) | |
2392 | { | |
2393 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
55034cd6 SRRH |
2394 | ring_buffer_expanded = true; |
2395 | tracing_selftest_disabled = true; | |
020e5f85 LZ |
2396 | |
2397 | return 1; | |
2398 | } | |
2399 | __setup("trace_event=", setup_trace_event); | |
2400 | ||
6fa3eb70 S |
2401 | #ifdef CONFIG_MTK_SCHED_TRACERS |
2402 | // collect boot time ftrace, disabled by default | |
2403 | static int boot_time_ftrace = 0; | |
2404 | ||
2405 | static __init int setup_boot_time_ftrace(char *str) | |
2406 | { | |
2407 | boot_time_ftrace = 1; | |
2408 | return 1; | |
2409 | } | |
2410 | __setup("boot_time_ftrace", setup_boot_time_ftrace); | |
2411 | ||
2412 | #ifdef CONFIG_MTK_FTRACE_DEFAULT_ENABLE | |
2413 | ||
2414 | // delay the ring buffer expand until lat_initcall stage | |
2415 | // to avoid impacting the boot time | |
2416 | static __init int expand_ring_buffer_init(void){ | |
2417 | if(!boot_time_ftrace) | |
2418 | tracing_update_buffers(); | |
2419 | return 0; | |
2420 | } | |
2421 | late_initcall(expand_ring_buffer_init); | |
2422 | ||
2423 | #endif /* CONFIG_MTK_FTRACE_DEFAULT_ENABLE */ | |
2424 | #endif /* CONFIG_MTK_SCHED_TRACERS */ | |
2425 | ||
77248221 SR |
2426 | /* Expects to have event_mutex held when called */ |
2427 | static int | |
2428 | create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) | |
ae63b31e SR |
2429 | { |
2430 | struct dentry *d_events; | |
2431 | struct dentry *entry; | |
2432 | ||
2433 | entry = debugfs_create_file("set_event", 0644, parent, | |
2434 | tr, &ftrace_set_event_fops); | |
2435 | if (!entry) { | |
2436 | pr_warning("Could not create debugfs 'set_event' entry\n"); | |
2437 | return -ENOMEM; | |
2438 | } | |
2439 | ||
2440 | d_events = debugfs_create_dir("events", parent); | |
277ba044 | 2441 | if (!d_events) { |
ae63b31e | 2442 | pr_warning("Could not create debugfs 'events' directory\n"); |
277ba044 SR |
2443 | return -ENOMEM; |
2444 | } | |
ae63b31e SR |
2445 | |
2446 | /* ring buffer internal formats */ | |
2447 | trace_create_file("header_page", 0444, d_events, | |
2448 | ring_buffer_print_page_header, | |
2449 | &ftrace_show_header_fops); | |
2450 | ||
2451 | trace_create_file("header_event", 0444, d_events, | |
2452 | ring_buffer_print_entry_header, | |
2453 | &ftrace_show_header_fops); | |
2454 | ||
2455 | trace_create_file("enable", 0644, d_events, | |
2456 | tr, &ftrace_tr_enable_fops); | |
2457 | ||
2458 | tr->event_dir = d_events; | |
77248221 SR |
2459 | |
2460 | return 0; | |
2461 | } | |
2462 | ||
2463 | /** | |
2464 | * event_trace_add_tracer - add a instance of a trace_array to events | |
2465 | * @parent: The parent dentry to place the files/directories for events in | |
2466 | * @tr: The trace array associated with these events | |
2467 | * | |
2468 | * When a new instance is created, it needs to set up its events | |
2469 | * directory, as well as other files associated with events. It also | |
2470 | * creates the event hierachry in the @parent/events directory. | |
2471 | * | |
2472 | * Returns 0 on success. | |
2473 | */ | |
2474 | int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2475 | { | |
2476 | int ret; | |
2477 | ||
2478 | mutex_lock(&event_mutex); | |
2479 | ||
2480 | ret = create_event_toplevel_files(parent, tr); | |
2481 | if (ret) | |
2482 | goto out_unlock; | |
2483 | ||
52f6ad6d | 2484 | down_write(&trace_event_sem); |
ae63b31e | 2485 | __trace_add_event_dirs(tr); |
52f6ad6d | 2486 | up_write(&trace_event_sem); |
277ba044 | 2487 | |
77248221 | 2488 | out_unlock: |
277ba044 | 2489 | mutex_unlock(&event_mutex); |
ae63b31e | 2490 | |
77248221 SR |
2491 | return ret; |
2492 | } | |
2493 | ||
2494 | /* | |
2495 | * The top trace array already had its file descriptors created. | |
2496 | * Now the files themselves need to be created. | |
2497 | */ | |
2498 | static __init int | |
2499 | early_event_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2500 | { | |
2501 | int ret; | |
2502 | ||
2503 | mutex_lock(&event_mutex); | |
2504 | ||
2505 | ret = create_event_toplevel_files(parent, tr); | |
2506 | if (ret) | |
2507 | goto out_unlock; | |
2508 | ||
52f6ad6d | 2509 | down_write(&trace_event_sem); |
77248221 | 2510 | __trace_early_add_event_dirs(tr); |
52f6ad6d | 2511 | up_write(&trace_event_sem); |
77248221 SR |
2512 | |
2513 | out_unlock: | |
2514 | mutex_unlock(&event_mutex); | |
2515 | ||
2516 | return ret; | |
ae63b31e SR |
2517 | } |
2518 | ||
0c8916c3 SR |
2519 | int event_trace_del_tracer(struct trace_array *tr) |
2520 | { | |
0c8916c3 SR |
2521 | mutex_lock(&event_mutex); |
2522 | ||
68cebd26 SRRH |
2523 | /* Disable any running events */ |
2524 | __ftrace_set_clr_event_nolock(tr, NULL, NULL, NULL, 0); | |
2525 | ||
52f6ad6d | 2526 | down_write(&trace_event_sem); |
0c8916c3 SR |
2527 | __trace_remove_event_dirs(tr); |
2528 | debugfs_remove_recursive(tr->event_dir); | |
52f6ad6d | 2529 | up_write(&trace_event_sem); |
0c8916c3 SR |
2530 | |
2531 | tr->event_dir = NULL; | |
2532 | ||
2533 | mutex_unlock(&event_mutex); | |
2534 | ||
2535 | return 0; | |
2536 | } | |
2537 | ||
d1a29143 SR |
2538 | static __init int event_trace_memsetup(void) |
2539 | { | |
2540 | field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); | |
2541 | file_cachep = KMEM_CACHE(ftrace_event_file, SLAB_PANIC); | |
2542 | return 0; | |
2543 | } | |
2544 | ||
8781915a EG |
2545 | static __init int event_trace_enable(void) |
2546 | { | |
ae63b31e | 2547 | struct trace_array *tr = top_trace_array(); |
8781915a EG |
2548 | struct ftrace_event_call **iter, *call; |
2549 | char *buf = bootup_event_buf; | |
2550 | char *token; | |
2551 | int ret; | |
2552 | ||
2553 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { | |
2554 | ||
2555 | call = *iter; | |
2556 | ret = event_init(call); | |
2557 | if (!ret) | |
2558 | list_add(&call->list, &ftrace_events); | |
2559 | } | |
2560 | ||
77248221 SR |
2561 | /* |
2562 | * We need the top trace array to have a working set of trace | |
2563 | * points at early init, before the debug files and directories | |
2564 | * are created. Create the file entries now, and attach them | |
2565 | * to the actual file dentries later. | |
2566 | */ | |
2567 | __trace_early_add_events(tr); | |
2568 | ||
8781915a EG |
2569 | while (true) { |
2570 | token = strsep(&buf, ","); | |
2571 | ||
2572 | if (!token) | |
2573 | break; | |
2574 | if (!*token) | |
2575 | continue; | |
2576 | ||
ae63b31e | 2577 | ret = ftrace_set_clr_event(tr, token, 1); |
8781915a EG |
2578 | if (ret) |
2579 | pr_warn("Failed to enable trace event: %s\n", token); | |
2580 | } | |
81698831 SR |
2581 | |
2582 | trace_printk_start_comm(); | |
2583 | ||
3cd715de SRRH |
2584 | register_event_cmds(); |
2585 | ||
8781915a EG |
2586 | return 0; |
2587 | } | |
2588 | ||
b77e38aa SR |
2589 | static __init int event_trace_init(void) |
2590 | { | |
ae63b31e | 2591 | struct trace_array *tr; |
b77e38aa SR |
2592 | struct dentry *d_tracer; |
2593 | struct dentry *entry; | |
6d723736 | 2594 | int ret; |
b77e38aa | 2595 | |
ae63b31e SR |
2596 | tr = top_trace_array(); |
2597 | ||
b77e38aa SR |
2598 | d_tracer = tracing_init_dentry(); |
2599 | if (!d_tracer) | |
2600 | return 0; | |
2601 | ||
2314c4ae | 2602 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
ae63b31e | 2603 | tr, &ftrace_avail_fops); |
2314c4ae SR |
2604 | if (!entry) |
2605 | pr_warning("Could not create debugfs " | |
2606 | "'available_events' entry\n"); | |
2607 | ||
8728fe50 LZ |
2608 | if (trace_define_common_fields()) |
2609 | pr_warning("tracing: Failed to allocate common fields"); | |
2610 | ||
77248221 | 2611 | ret = early_event_add_tracer(d_tracer, tr); |
ae63b31e SR |
2612 | if (ret) |
2613 | return ret; | |
020e5f85 | 2614 | |
6fa3eb70 S |
2615 | #ifdef CONFIG_MTK_FTRACE_DEFAULT_ENABLE |
2616 | // enable ftrace facilities | |
2617 | mt_ftrace_enable_disable(1); | |
2618 | ||
2619 | // only update buffer eariler if we want to collect boot-time ftrace | |
2620 | // to avoid the boot time impacted by early-expanded ring buffer | |
2621 | if(boot_time_ftrace) | |
2622 | tracing_update_buffers(); | |
2623 | else | |
2624 | set_tracer_flag(tr, TRACE_ITER_OVERWRITE, 1); | |
2625 | printk(KERN_INFO "[ftrace]ftrace ready...\n"); | |
2626 | #endif | |
2627 | ||
6d723736 | 2628 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 2629 | if (ret) |
6d723736 SR |
2630 | pr_warning("Failed to register trace events module notifier\n"); |
2631 | ||
b77e38aa SR |
2632 | return 0; |
2633 | } | |
d1a29143 | 2634 | early_initcall(event_trace_memsetup); |
8781915a | 2635 | core_initcall(event_trace_enable); |
b77e38aa | 2636 | fs_initcall(event_trace_init); |
e6187007 SR |
2637 | |
2638 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
2639 | ||
2640 | static DEFINE_SPINLOCK(test_spinlock); | |
2641 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
2642 | static DEFINE_MUTEX(test_mutex); | |
2643 | ||
2644 | static __init void test_work(struct work_struct *dummy) | |
2645 | { | |
2646 | spin_lock(&test_spinlock); | |
2647 | spin_lock_irq(&test_spinlock_irq); | |
2648 | udelay(1); | |
2649 | spin_unlock_irq(&test_spinlock_irq); | |
2650 | spin_unlock(&test_spinlock); | |
2651 | ||
2652 | mutex_lock(&test_mutex); | |
2653 | msleep(1); | |
2654 | mutex_unlock(&test_mutex); | |
2655 | } | |
2656 | ||
2657 | static __init int event_test_thread(void *unused) | |
2658 | { | |
2659 | void *test_malloc; | |
2660 | ||
2661 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
2662 | if (!test_malloc) | |
2663 | pr_info("failed to kmalloc\n"); | |
2664 | ||
2665 | schedule_on_each_cpu(test_work); | |
2666 | ||
2667 | kfree(test_malloc); | |
2668 | ||
2669 | set_current_state(TASK_INTERRUPTIBLE); | |
2670 | while (!kthread_should_stop()) | |
2671 | schedule(); | |
2672 | ||
2673 | return 0; | |
2674 | } | |
2675 | ||
2676 | /* | |
2677 | * Do various things that may trigger events. | |
2678 | */ | |
2679 | static __init void event_test_stuff(void) | |
2680 | { | |
2681 | struct task_struct *test_thread; | |
2682 | ||
2683 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
2684 | msleep(1); | |
2685 | kthread_stop(test_thread); | |
2686 | } | |
2687 | ||
2688 | /* | |
2689 | * For every trace event defined, we will test each trace point separately, | |
2690 | * and then by groups, and finally all trace points. | |
2691 | */ | |
9ea21c1e | 2692 | static __init void event_trace_self_tests(void) |
e6187007 | 2693 | { |
ae63b31e SR |
2694 | struct ftrace_subsystem_dir *dir; |
2695 | struct ftrace_event_file *file; | |
e6187007 SR |
2696 | struct ftrace_event_call *call; |
2697 | struct event_subsystem *system; | |
ae63b31e | 2698 | struct trace_array *tr; |
e6187007 SR |
2699 | int ret; |
2700 | ||
ae63b31e SR |
2701 | tr = top_trace_array(); |
2702 | ||
e6187007 SR |
2703 | pr_info("Running tests on trace events:\n"); |
2704 | ||
ae63b31e SR |
2705 | list_for_each_entry(file, &tr->events, list) { |
2706 | ||
2707 | call = file->event_call; | |
e6187007 | 2708 | |
2239291a SR |
2709 | /* Only test those that have a probe */ |
2710 | if (!call->class || !call->class->probe) | |
e6187007 SR |
2711 | continue; |
2712 | ||
1f5a6b45 SR |
2713 | /* |
2714 | * Testing syscall events here is pretty useless, but | |
2715 | * we still do it if configured. But this is time consuming. | |
2716 | * What we really need is a user thread to perform the | |
2717 | * syscalls as we test. | |
2718 | */ | |
2719 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
2720 | if (call->class->system && |
2721 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
2722 | continue; |
2723 | #endif | |
2724 | ||
e6187007 SR |
2725 | pr_info("Testing event %s: ", call->name); |
2726 | ||
2727 | /* | |
2728 | * If an event is already enabled, someone is using | |
2729 | * it and the self test should not be on. | |
2730 | */ | |
ae63b31e | 2731 | if (file->flags & FTRACE_EVENT_FL_ENABLED) { |
e6187007 SR |
2732 | pr_warning("Enabled event during self test!\n"); |
2733 | WARN_ON_ONCE(1); | |
2734 | continue; | |
2735 | } | |
2736 | ||
ae63b31e | 2737 | ftrace_event_enable_disable(file, 1); |
e6187007 | 2738 | event_test_stuff(); |
ae63b31e | 2739 | ftrace_event_enable_disable(file, 0); |
e6187007 SR |
2740 | |
2741 | pr_cont("OK\n"); | |
2742 | } | |
2743 | ||
2744 | /* Now test at the sub system level */ | |
2745 | ||
2746 | pr_info("Running tests on trace event systems:\n"); | |
2747 | ||
ae63b31e SR |
2748 | list_for_each_entry(dir, &tr->systems, list) { |
2749 | ||
2750 | system = dir->subsystem; | |
e6187007 SR |
2751 | |
2752 | /* the ftrace system is special, skip it */ | |
2753 | if (strcmp(system->name, "ftrace") == 0) | |
2754 | continue; | |
2755 | ||
2756 | pr_info("Testing event system %s: ", system->name); | |
2757 | ||
ae63b31e | 2758 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
e6187007 SR |
2759 | if (WARN_ON_ONCE(ret)) { |
2760 | pr_warning("error enabling system %s\n", | |
2761 | system->name); | |
2762 | continue; | |
2763 | } | |
2764 | ||
2765 | event_test_stuff(); | |
2766 | ||
ae63b31e | 2767 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
76bab1b7 | 2768 | if (WARN_ON_ONCE(ret)) { |
e6187007 SR |
2769 | pr_warning("error disabling system %s\n", |
2770 | system->name); | |
76bab1b7 YL |
2771 | continue; |
2772 | } | |
e6187007 SR |
2773 | |
2774 | pr_cont("OK\n"); | |
2775 | } | |
2776 | ||
2777 | /* Test with all events enabled */ | |
2778 | ||
2779 | pr_info("Running tests on all trace events:\n"); | |
2780 | pr_info("Testing all events: "); | |
2781 | ||
ae63b31e | 2782 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
e6187007 | 2783 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 2784 | pr_warning("error enabling all events\n"); |
9ea21c1e | 2785 | return; |
e6187007 SR |
2786 | } |
2787 | ||
2788 | event_test_stuff(); | |
2789 | ||
2790 | /* reset sysname */ | |
ae63b31e | 2791 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
e6187007 SR |
2792 | if (WARN_ON_ONCE(ret)) { |
2793 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 2794 | return; |
e6187007 SR |
2795 | } |
2796 | ||
2797 | pr_cont("OK\n"); | |
9ea21c1e SR |
2798 | } |
2799 | ||
2800 | #ifdef CONFIG_FUNCTION_TRACER | |
2801 | ||
245b2e70 | 2802 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e SR |
2803 | |
2804 | static void | |
2f5f6ad9 | 2805 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 2806 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
9ea21c1e SR |
2807 | { |
2808 | struct ring_buffer_event *event; | |
e77405ad | 2809 | struct ring_buffer *buffer; |
9ea21c1e SR |
2810 | struct ftrace_entry *entry; |
2811 | unsigned long flags; | |
2812 | long disabled; | |
9ea21c1e SR |
2813 | int cpu; |
2814 | int pc; | |
2815 | ||
2816 | pc = preempt_count(); | |
5168ae50 | 2817 | preempt_disable_notrace(); |
9ea21c1e | 2818 | cpu = raw_smp_processor_id(); |
245b2e70 | 2819 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
2820 | |
2821 | if (disabled != 1) | |
2822 | goto out; | |
2823 | ||
2824 | local_save_flags(flags); | |
2825 | ||
e77405ad SR |
2826 | event = trace_current_buffer_lock_reserve(&buffer, |
2827 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
2828 | flags, pc); |
2829 | if (!event) | |
2830 | goto out; | |
2831 | entry = ring_buffer_event_data(event); | |
2832 | entry->ip = ip; | |
2833 | entry->parent_ip = parent_ip; | |
2834 | ||
0d5c6e1c | 2835 | trace_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
2836 | |
2837 | out: | |
245b2e70 | 2838 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 2839 | preempt_enable_notrace(); |
9ea21c1e SR |
2840 | } |
2841 | ||
2842 | static struct ftrace_ops trace_ops __initdata = | |
2843 | { | |
2844 | .func = function_test_events_call, | |
4740974a | 2845 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
9ea21c1e SR |
2846 | }; |
2847 | ||
2848 | static __init void event_trace_self_test_with_function(void) | |
2849 | { | |
17bb615a SR |
2850 | int ret; |
2851 | ret = register_ftrace_function(&trace_ops); | |
2852 | if (WARN_ON(ret < 0)) { | |
2853 | pr_info("Failed to enable function tracer for event tests\n"); | |
2854 | return; | |
2855 | } | |
9ea21c1e SR |
2856 | pr_info("Running tests again, along with the function tracer\n"); |
2857 | event_trace_self_tests(); | |
2858 | unregister_ftrace_function(&trace_ops); | |
2859 | } | |
2860 | #else | |
2861 | static __init void event_trace_self_test_with_function(void) | |
2862 | { | |
2863 | } | |
2864 | #endif | |
2865 | ||
2866 | static __init int event_trace_self_tests_init(void) | |
2867 | { | |
020e5f85 LZ |
2868 | if (!tracing_selftest_disabled) { |
2869 | event_trace_self_tests(); | |
2870 | event_trace_self_test_with_function(); | |
2871 | } | |
e6187007 SR |
2872 | |
2873 | return 0; | |
2874 | } | |
2875 | ||
28d20e2d | 2876 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
2877 | |
2878 | #endif |