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Steven Rostedtb77e38a2009-02-24 10:21:36 -05001/*
2 * event tracer
3 *
4 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
5 *
Steven Rostedt981d0812009-03-02 13:53:59 -05006 * - Added format output of fields of the trace point.
7 * This was based off of work by Tom Zanussi <tzanussi@gmail.com>.
8 *
Steven Rostedtb77e38a2009-02-24 10:21:36 -05009 */
10
Steven Rostedte6187002009-04-15 13:36:40 -040011#include <linux/workqueue.h>
12#include <linux/spinlock.h>
13#include <linux/kthread.h>
Steven Rostedtb77e38a2009-02-24 10:21:36 -050014#include <linux/debugfs.h>
15#include <linux/uaccess.h>
16#include <linux/module.h>
17#include <linux/ctype.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090018#include <linux/slab.h>
Steven Rostedte6187002009-04-15 13:36:40 -040019#include <linux/delay.h>
Steven Rostedtb77e38a2009-02-24 10:21:36 -050020
Li Zefan020e5f82009-07-01 10:47:05 +080021#include <asm/setup.h>
22
Steven Rostedt91729ef2009-03-02 15:03:01 -050023#include "trace_output.h"
Steven Rostedtb77e38a2009-02-24 10:21:36 -050024
Steven Rostedt4e5292e2009-09-12 19:26:21 -040025#undef TRACE_SYSTEM
Steven Rostedtb628b3e2009-02-27 23:32:58 -050026#define TRACE_SYSTEM "TRACE_SYSTEM"
27
Li Zefan20c89282009-05-06 10:33:45 +080028DEFINE_MUTEX(event_mutex);
Steven Rostedt11a241a2009-03-02 11:49:04 -050029
Steven Rostedt04295782010-11-12 22:32:11 -050030DEFINE_MUTEX(event_storage_mutex);
31EXPORT_SYMBOL_GPL(event_storage_mutex);
32
33char event_storage[EVENT_STORAGE_SIZE];
34EXPORT_SYMBOL_GPL(event_storage);
35
Steven Rostedta59fd602009-04-10 13:52:20 -040036LIST_HEAD(ftrace_events);
zhangwei(Jovi)b3a8c6f2013-03-11 15:13:42 +080037static LIST_HEAD(ftrace_common_fields);
Steven Rostedta59fd602009-04-10 13:52:20 -040038
Steven Rostedtd1a29142013-02-27 20:23:57 -050039#define GFP_TRACE (GFP_KERNEL | __GFP_ZERO)
40
41static struct kmem_cache *field_cachep;
42static struct kmem_cache *file_cachep;
43
Steven Rostedtae63b312012-05-03 23:09:03 -040044/* Double loops, do not use break, only goto's work */
45#define do_for_each_event_file(tr, file) \
46 list_for_each_entry(tr, &ftrace_trace_arrays, list) { \
47 list_for_each_entry(file, &tr->events, list)
48
49#define do_for_each_event_file_safe(tr, file) \
50 list_for_each_entry(tr, &ftrace_trace_arrays, list) { \
51 struct ftrace_event_file *___n; \
52 list_for_each_entry_safe(file, ___n, &tr->events, list)
53
54#define while_for_each_event_file() \
55 }
56
zhangwei(Jovi)b3a8c6f2013-03-11 15:13:42 +080057static struct list_head *
Steven Rostedt2e33af02010-04-22 10:35:55 -040058trace_get_fields(struct ftrace_event_call *event_call)
59{
60 if (!event_call->class->get_fields)
61 return &event_call->class->fields;
62 return event_call->class->get_fields(event_call);
63}
64
zhangwei(Jovi)b3a8c6f2013-03-11 15:13:42 +080065static struct ftrace_event_field *
66__find_event_field(struct list_head *head, char *name)
67{
68 struct ftrace_event_field *field;
69
70 list_for_each_entry(field, head, link) {
71 if (!strcmp(field->name, name))
72 return field;
73 }
74
75 return NULL;
76}
77
78struct ftrace_event_field *
79trace_find_event_field(struct ftrace_event_call *call, char *name)
80{
81 struct ftrace_event_field *field;
82 struct list_head *head;
83
84 field = __find_event_field(&ftrace_common_fields, name);
85 if (field)
86 return field;
87
88 head = trace_get_fields(call);
89 return __find_event_field(head, name);
90}
91
Li Zefan8728fe52010-05-24 16:22:49 +080092static int __trace_define_field(struct list_head *head, const char *type,
93 const char *name, int offset, int size,
94 int is_signed, int filter_type)
Tom Zanussicf027f62009-03-22 03:30:39 -050095{
96 struct ftrace_event_field *field;
97
Steven Rostedtd1a29142013-02-27 20:23:57 -050098 field = kmem_cache_alloc(field_cachep, GFP_TRACE);
Tom Zanussicf027f62009-03-22 03:30:39 -050099 if (!field)
Namhyung Kimaaf6ac02013-06-07 15:07:48 +0900100 return -ENOMEM;
Ingo Molnarfe9f57f2009-03-22 18:41:59 +0100101
Steven Rostedt92edca02013-02-27 20:41:37 -0500102 field->name = name;
103 field->type = type;
Ingo Molnarfe9f57f2009-03-22 18:41:59 +0100104
Li Zefan43b51ea2009-08-07 10:33:22 +0800105 if (filter_type == FILTER_OTHER)
106 field->filter_type = filter_assign_type(type);
107 else
108 field->filter_type = filter_type;
109
Tom Zanussicf027f62009-03-22 03:30:39 -0500110 field->offset = offset;
111 field->size = size;
Tom Zanussia118e4d2009-04-28 03:04:53 -0500112 field->is_signed = is_signed;
Li Zefanaa38e9f2009-08-07 10:33:02 +0800113
Steven Rostedt2e33af02010-04-22 10:35:55 -0400114 list_add(&field->link, head);
Tom Zanussicf027f62009-03-22 03:30:39 -0500115
116 return 0;
Tom Zanussicf027f62009-03-22 03:30:39 -0500117}
Li Zefan8728fe52010-05-24 16:22:49 +0800118
119int trace_define_field(struct ftrace_event_call *call, const char *type,
120 const char *name, int offset, int size, int is_signed,
121 int filter_type)
122{
123 struct list_head *head;
124
125 if (WARN_ON(!call->class))
126 return 0;
127
128 head = trace_get_fields(call);
129 return __trace_define_field(head, type, name, offset, size,
130 is_signed, filter_type);
131}
Steven Rostedt17c873e2009-04-10 18:12:50 -0400132EXPORT_SYMBOL_GPL(trace_define_field);
Tom Zanussicf027f62009-03-22 03:30:39 -0500133
Li Zefane647d6b2009-08-19 15:54:32 +0800134#define __common_field(type, item) \
Li Zefan8728fe52010-05-24 16:22:49 +0800135 ret = __trace_define_field(&ftrace_common_fields, #type, \
136 "common_" #item, \
137 offsetof(typeof(ent), item), \
138 sizeof(ent.item), \
139 is_signed_type(type), FILTER_OTHER); \
Li Zefane647d6b2009-08-19 15:54:32 +0800140 if (ret) \
141 return ret;
142
Li Zefan8728fe52010-05-24 16:22:49 +0800143static int trace_define_common_fields(void)
Li Zefane647d6b2009-08-19 15:54:32 +0800144{
145 int ret;
146 struct trace_entry ent;
147
148 __common_field(unsigned short, type);
149 __common_field(unsigned char, flags);
150 __common_field(unsigned char, preempt_count);
151 __common_field(int, pid);
Li Zefane647d6b2009-08-19 15:54:32 +0800152
153 return ret;
154}
155
zhangwei(Jovi)ad7067c2013-03-11 15:13:46 +0800156static void trace_destroy_fields(struct ftrace_event_call *call)
Li Zefan2df75e42009-05-06 10:33:04 +0800157{
158 struct ftrace_event_field *field, *next;
Steven Rostedt2e33af02010-04-22 10:35:55 -0400159 struct list_head *head;
Li Zefan2df75e42009-05-06 10:33:04 +0800160
Steven Rostedt2e33af02010-04-22 10:35:55 -0400161 head = trace_get_fields(call);
162 list_for_each_entry_safe(field, next, head, link) {
Li Zefan2df75e42009-05-06 10:33:04 +0800163 list_del(&field->link);
Steven Rostedtd1a29142013-02-27 20:23:57 -0500164 kmem_cache_free(field_cachep, field);
Li Zefan2df75e42009-05-06 10:33:04 +0800165 }
166}
167
Li Zefan87d9b4e2009-12-08 11:14:20 +0800168int trace_event_raw_init(struct ftrace_event_call *call)
169{
170 int id;
171
Steven Rostedt80decc72010-04-23 10:00:22 -0400172 id = register_ftrace_event(&call->event);
Li Zefan87d9b4e2009-12-08 11:14:20 +0800173 if (!id)
174 return -ENODEV;
Li Zefan87d9b4e2009-12-08 11:14:20 +0800175
176 return 0;
177}
178EXPORT_SYMBOL_GPL(trace_event_raw_init);
179
Jiri Olsaceec0b62012-02-15 15:51:49 +0100180int ftrace_event_reg(struct ftrace_event_call *call,
181 enum trace_reg type, void *data)
Steven Rostedta1d0ce82010-06-08 11:22:06 -0400182{
Steven Rostedtae63b312012-05-03 23:09:03 -0400183 struct ftrace_event_file *file = data;
184
Steven Rostedta1d0ce82010-06-08 11:22:06 -0400185 switch (type) {
186 case TRACE_REG_REGISTER:
187 return tracepoint_probe_register(call->name,
188 call->class->probe,
Steven Rostedtae63b312012-05-03 23:09:03 -0400189 file);
Steven Rostedta1d0ce82010-06-08 11:22:06 -0400190 case TRACE_REG_UNREGISTER:
191 tracepoint_probe_unregister(call->name,
192 call->class->probe,
Steven Rostedtae63b312012-05-03 23:09:03 -0400193 file);
Steven Rostedta1d0ce82010-06-08 11:22:06 -0400194 return 0;
195
196#ifdef CONFIG_PERF_EVENTS
197 case TRACE_REG_PERF_REGISTER:
198 return tracepoint_probe_register(call->name,
199 call->class->perf_probe,
200 call);
201 case TRACE_REG_PERF_UNREGISTER:
202 tracepoint_probe_unregister(call->name,
203 call->class->perf_probe,
204 call);
205 return 0;
Jiri Olsaceec0b62012-02-15 15:51:49 +0100206 case TRACE_REG_PERF_OPEN:
207 case TRACE_REG_PERF_CLOSE:
Jiri Olsa489c75c2012-02-15 15:51:50 +0100208 case TRACE_REG_PERF_ADD:
209 case TRACE_REG_PERF_DEL:
Jiri Olsaceec0b62012-02-15 15:51:49 +0100210 return 0;
Steven Rostedta1d0ce82010-06-08 11:22:06 -0400211#endif
212 }
213 return 0;
214}
215EXPORT_SYMBOL_GPL(ftrace_event_reg);
216
Li Zefane870e9a2010-07-02 11:07:32 +0800217void trace_event_enable_cmd_record(bool enable)
218{
Steven Rostedtae63b312012-05-03 23:09:03 -0400219 struct ftrace_event_file *file;
220 struct trace_array *tr;
Li Zefane870e9a2010-07-02 11:07:32 +0800221
222 mutex_lock(&event_mutex);
Steven Rostedtae63b312012-05-03 23:09:03 -0400223 do_for_each_event_file(tr, file) {
224
225 if (!(file->flags & FTRACE_EVENT_FL_ENABLED))
Li Zefane870e9a2010-07-02 11:07:32 +0800226 continue;
227
228 if (enable) {
229 tracing_start_cmdline_record();
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400230 set_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags);
Li Zefane870e9a2010-07-02 11:07:32 +0800231 } else {
232 tracing_stop_cmdline_record();
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400233 clear_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags);
Li Zefane870e9a2010-07-02 11:07:32 +0800234 }
Steven Rostedtae63b312012-05-03 23:09:03 -0400235 } while_for_each_event_file();
Li Zefane870e9a2010-07-02 11:07:32 +0800236 mutex_unlock(&event_mutex);
237}
238
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400239static int __ftrace_event_enable_disable(struct ftrace_event_file *file,
240 int enable, int soft_disable)
Steven Rostedtfd994982009-02-28 02:41:25 -0500241{
Steven Rostedtae63b312012-05-03 23:09:03 -0400242 struct ftrace_event_call *call = file->event_call;
Li Zefan3b8e4272009-12-08 11:14:52 +0800243 int ret = 0;
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400244 int disable;
Li Zefan3b8e4272009-12-08 11:14:52 +0800245
Steven Rostedtfd994982009-02-28 02:41:25 -0500246 switch (enable) {
247 case 0:
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400248 /*
Masami Hiramatsu1cf4c072013-05-09 14:44:29 +0900249 * When soft_disable is set and enable is cleared, the sm_ref
250 * reference counter is decremented. If it reaches 0, we want
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400251 * to clear the SOFT_DISABLED flag but leave the event in the
252 * state that it was. That is, if the event was enabled and
253 * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED
254 * is set we do not want the event to be enabled before we
255 * clear the bit.
256 *
257 * When soft_disable is not set but the SOFT_MODE flag is,
258 * we do nothing. Do not disable the tracepoint, otherwise
259 * "soft enable"s (clearing the SOFT_DISABLED bit) wont work.
260 */
261 if (soft_disable) {
Masami Hiramatsu1cf4c072013-05-09 14:44:29 +0900262 if (atomic_dec_return(&file->sm_ref) > 0)
263 break;
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400264 disable = file->flags & FTRACE_EVENT_FL_SOFT_DISABLED;
265 clear_bit(FTRACE_EVENT_FL_SOFT_MODE_BIT, &file->flags);
266 } else
267 disable = !(file->flags & FTRACE_EVENT_FL_SOFT_MODE);
268
269 if (disable && (file->flags & FTRACE_EVENT_FL_ENABLED)) {
270 clear_bit(FTRACE_EVENT_FL_ENABLED_BIT, &file->flags);
Steven Rostedtae63b312012-05-03 23:09:03 -0400271 if (file->flags & FTRACE_EVENT_FL_RECORDED_CMD) {
Li Zefane870e9a2010-07-02 11:07:32 +0800272 tracing_stop_cmdline_record();
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400273 clear_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags);
Li Zefane870e9a2010-07-02 11:07:32 +0800274 }
Steven Rostedtae63b312012-05-03 23:09:03 -0400275 call->class->reg(call, TRACE_REG_UNREGISTER, file);
Steven Rostedtfd994982009-02-28 02:41:25 -0500276 }
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400277 /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT */
278 if (file->flags & FTRACE_EVENT_FL_SOFT_MODE)
279 set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags);
Steven Rostedtfd994982009-02-28 02:41:25 -0500280 break;
281 case 1:
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400282 /*
283 * When soft_disable is set and enable is set, we want to
284 * register the tracepoint for the event, but leave the event
285 * as is. That means, if the event was already enabled, we do
286 * nothing (but set SOFT_MODE). If the event is disabled, we
287 * set SOFT_DISABLED before enabling the event tracepoint, so
288 * it still seems to be disabled.
289 */
290 if (!soft_disable)
291 clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags);
Masami Hiramatsu1cf4c072013-05-09 14:44:29 +0900292 else {
293 if (atomic_inc_return(&file->sm_ref) > 1)
294 break;
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400295 set_bit(FTRACE_EVENT_FL_SOFT_MODE_BIT, &file->flags);
Masami Hiramatsu1cf4c072013-05-09 14:44:29 +0900296 }
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400297
Steven Rostedtae63b312012-05-03 23:09:03 -0400298 if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) {
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400299
300 /* Keep the event disabled, when going to SOFT_MODE. */
301 if (soft_disable)
302 set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags);
303
Li Zefane870e9a2010-07-02 11:07:32 +0800304 if (trace_flags & TRACE_ITER_RECORD_CMD) {
305 tracing_start_cmdline_record();
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400306 set_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags);
Li Zefane870e9a2010-07-02 11:07:32 +0800307 }
Steven Rostedtae63b312012-05-03 23:09:03 -0400308 ret = call->class->reg(call, TRACE_REG_REGISTER, file);
Li Zefan3b8e4272009-12-08 11:14:52 +0800309 if (ret) {
310 tracing_stop_cmdline_record();
311 pr_info("event trace: Could not enable event "
312 "%s\n", call->name);
313 break;
314 }
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400315 set_bit(FTRACE_EVENT_FL_ENABLED_BIT, &file->flags);
Steven Rostedt (Red Hat)575380d2013-03-04 23:05:12 -0500316
317 /* WAS_ENABLED gets set but never cleared. */
318 call->flags |= TRACE_EVENT_FL_WAS_ENABLED;
Steven Rostedtfd994982009-02-28 02:41:25 -0500319 }
Steven Rostedtfd994982009-02-28 02:41:25 -0500320 break;
321 }
Li Zefan3b8e4272009-12-08 11:14:52 +0800322
323 return ret;
Steven Rostedtfd994982009-02-28 02:41:25 -0500324}
325
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400326static int ftrace_event_enable_disable(struct ftrace_event_file *file,
327 int enable)
328{
329 return __ftrace_event_enable_disable(file, enable, 0);
330}
331
Steven Rostedtae63b312012-05-03 23:09:03 -0400332static void ftrace_clear_events(struct trace_array *tr)
Zhaolei0e907c92009-05-25 18:13:59 +0800333{
Steven Rostedtae63b312012-05-03 23:09:03 -0400334 struct ftrace_event_file *file;
Zhaolei0e907c92009-05-25 18:13:59 +0800335
336 mutex_lock(&event_mutex);
Steven Rostedtae63b312012-05-03 23:09:03 -0400337 list_for_each_entry(file, &tr->events, list) {
338 ftrace_event_enable_disable(file, 0);
Zhaolei0e907c92009-05-25 18:13:59 +0800339 }
340 mutex_unlock(&event_mutex);
341}
342
Steven Rostedte9dbfae2011-07-05 11:36:06 -0400343static void __put_system(struct event_subsystem *system)
344{
345 struct event_filter *filter = system->filter;
346
347 WARN_ON_ONCE(system->ref_count == 0);
348 if (--system->ref_count)
349 return;
350
Steven Rostedtae63b312012-05-03 23:09:03 -0400351 list_del(&system->list);
352
Steven Rostedte9dbfae2011-07-05 11:36:06 -0400353 if (filter) {
354 kfree(filter->filter_string);
355 kfree(filter);
356 }
Steven Rostedte9dbfae2011-07-05 11:36:06 -0400357 kfree(system);
358}
359
360static void __get_system(struct event_subsystem *system)
361{
362 WARN_ON_ONCE(system->ref_count == 0);
363 system->ref_count++;
364}
365
Steven Rostedtae63b312012-05-03 23:09:03 -0400366static void __get_system_dir(struct ftrace_subsystem_dir *dir)
367{
368 WARN_ON_ONCE(dir->ref_count == 0);
369 dir->ref_count++;
370 __get_system(dir->subsystem);
371}
372
373static void __put_system_dir(struct ftrace_subsystem_dir *dir)
374{
375 WARN_ON_ONCE(dir->ref_count == 0);
376 /* If the subsystem is about to be freed, the dir must be too */
377 WARN_ON_ONCE(dir->subsystem->ref_count == 1 && dir->ref_count != 1);
378
379 __put_system(dir->subsystem);
380 if (!--dir->ref_count)
381 kfree(dir);
382}
383
384static void put_system(struct ftrace_subsystem_dir *dir)
Steven Rostedte9dbfae2011-07-05 11:36:06 -0400385{
386 mutex_lock(&event_mutex);
Steven Rostedtae63b312012-05-03 23:09:03 -0400387 __put_system_dir(dir);
Steven Rostedte9dbfae2011-07-05 11:36:06 -0400388 mutex_unlock(&event_mutex);
389}
390
Li Zefan8f31bfe2009-05-08 10:31:42 +0800391/*
392 * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events.
393 */
Steven Rostedtae63b312012-05-03 23:09:03 -0400394static int __ftrace_set_clr_event(struct trace_array *tr, const char *match,
395 const char *sub, const char *event, int set)
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500396{
Steven Rostedtae63b312012-05-03 23:09:03 -0400397 struct ftrace_event_file *file;
Steven Rostedta59fd602009-04-10 13:52:20 -0400398 struct ftrace_event_call *call;
Steven Rostedt29f93942009-05-08 16:06:47 -0400399 int ret = -EINVAL;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500400
Steven Rostedt11a241a2009-03-02 11:49:04 -0500401 mutex_lock(&event_mutex);
Steven Rostedtae63b312012-05-03 23:09:03 -0400402 list_for_each_entry(file, &tr->events, list) {
403
404 call = file->event_call;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500405
Steven Rostedta1d0ce82010-06-08 11:22:06 -0400406 if (!call->name || !call->class || !call->class->reg)
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500407 continue;
Steven Rostedt1473e442009-02-24 14:15:08 -0500408
Steven Rostedt9b637762012-05-10 15:55:43 -0400409 if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)
410 continue;
411
Steven Rostedtb628b3e2009-02-27 23:32:58 -0500412 if (match &&
413 strcmp(match, call->name) != 0 &&
Steven Rostedt8f082012010-04-20 10:47:33 -0400414 strcmp(match, call->class->system) != 0)
Steven Rostedtb628b3e2009-02-27 23:32:58 -0500415 continue;
416
Steven Rostedt8f082012010-04-20 10:47:33 -0400417 if (sub && strcmp(sub, call->class->system) != 0)
Steven Rostedtb628b3e2009-02-27 23:32:58 -0500418 continue;
419
420 if (event && strcmp(event, call->name) != 0)
Steven Rostedt1473e442009-02-24 14:15:08 -0500421 continue;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500422
Steven Rostedtae63b312012-05-03 23:09:03 -0400423 ftrace_event_enable_disable(file, set);
Steven Rostedtfd994982009-02-28 02:41:25 -0500424
Steven Rostedtb628b3e2009-02-27 23:32:58 -0500425 ret = 0;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500426 }
Steven Rostedt11a241a2009-03-02 11:49:04 -0500427 mutex_unlock(&event_mutex);
428
Steven Rostedtb628b3e2009-02-27 23:32:58 -0500429 return ret;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500430}
431
Steven Rostedtae63b312012-05-03 23:09:03 -0400432static int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set)
Li Zefan8f31bfe2009-05-08 10:31:42 +0800433{
434 char *event = NULL, *sub = NULL, *match;
435
436 /*
437 * The buf format can be <subsystem>:<event-name>
438 * *:<event-name> means any event by that name.
439 * :<event-name> is the same.
440 *
441 * <subsystem>:* means all events in that subsystem
442 * <subsystem>: means the same.
443 *
444 * <name> (no ':') means all events in a subsystem with
445 * the name <name> or any event that matches <name>
446 */
447
448 match = strsep(&buf, ":");
449 if (buf) {
450 sub = match;
451 event = buf;
452 match = NULL;
453
454 if (!strlen(sub) || strcmp(sub, "*") == 0)
455 sub = NULL;
456 if (!strlen(event) || strcmp(event, "*") == 0)
457 event = NULL;
458 }
459
Steven Rostedtae63b312012-05-03 23:09:03 -0400460 return __ftrace_set_clr_event(tr, match, sub, event, set);
Li Zefan8f31bfe2009-05-08 10:31:42 +0800461}
462
Steven Rostedt4671c792009-05-08 16:27:41 -0400463/**
464 * trace_set_clr_event - enable or disable an event
465 * @system: system name to match (NULL for any system)
466 * @event: event name to match (NULL for all events, within system)
467 * @set: 1 to enable, 0 to disable
468 *
469 * This is a way for other parts of the kernel to enable or disable
470 * event recording.
471 *
472 * Returns 0 on success, -EINVAL if the parameters do not match any
473 * registered events.
474 */
475int trace_set_clr_event(const char *system, const char *event, int set)
476{
Steven Rostedtae63b312012-05-03 23:09:03 -0400477 struct trace_array *tr = top_trace_array();
478
479 return __ftrace_set_clr_event(tr, NULL, system, event, set);
Steven Rostedt4671c792009-05-08 16:27:41 -0400480}
Yuanhan Liu56355b82010-11-08 14:05:12 +0800481EXPORT_SYMBOL_GPL(trace_set_clr_event);
Steven Rostedt4671c792009-05-08 16:27:41 -0400482
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500483/* 128 should be much more than enough */
484#define EVENT_BUF_SIZE 127
485
486static ssize_t
487ftrace_event_write(struct file *file, const char __user *ubuf,
488 size_t cnt, loff_t *ppos)
489{
jolsa@redhat.com48966362009-09-11 17:29:28 +0200490 struct trace_parser parser;
Steven Rostedtae63b312012-05-03 23:09:03 -0400491 struct seq_file *m = file->private_data;
492 struct trace_array *tr = m->private;
Li Zefan4ba79782009-09-22 13:52:20 +0800493 ssize_t read, ret;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500494
Li Zefan4ba79782009-09-22 13:52:20 +0800495 if (!cnt)
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500496 return 0;
497
Steven Rostedt1852fcc2009-03-11 14:33:00 -0400498 ret = tracing_update_buffers();
499 if (ret < 0)
500 return ret;
501
jolsa@redhat.com48966362009-09-11 17:29:28 +0200502 if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1))
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500503 return -ENOMEM;
504
jolsa@redhat.com48966362009-09-11 17:29:28 +0200505 read = trace_get_user(&parser, ubuf, cnt, ppos);
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500506
Li Zefan4ba79782009-09-22 13:52:20 +0800507 if (read >= 0 && trace_parser_loaded((&parser))) {
jolsa@redhat.com48966362009-09-11 17:29:28 +0200508 int set = 1;
509
510 if (*parser.buffer == '!')
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500511 set = 0;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500512
jolsa@redhat.com48966362009-09-11 17:29:28 +0200513 parser.buffer[parser.idx] = 0;
514
Steven Rostedtae63b312012-05-03 23:09:03 -0400515 ret = ftrace_set_clr_event(tr, parser.buffer + !set, set);
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500516 if (ret)
jolsa@redhat.com48966362009-09-11 17:29:28 +0200517 goto out_put;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500518 }
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500519
520 ret = read;
521
jolsa@redhat.com48966362009-09-11 17:29:28 +0200522 out_put:
523 trace_parser_put(&parser);
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500524
525 return ret;
526}
527
528static void *
529t_next(struct seq_file *m, void *v, loff_t *pos)
530{
Steven Rostedtae63b312012-05-03 23:09:03 -0400531 struct ftrace_event_file *file = v;
532 struct ftrace_event_call *call;
533 struct trace_array *tr = m->private;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500534
535 (*pos)++;
536
Steven Rostedtae63b312012-05-03 23:09:03 -0400537 list_for_each_entry_continue(file, &tr->events, list) {
538 call = file->event_call;
Steven Rostedt40e26812009-03-10 11:32:40 -0400539 /*
540 * The ftrace subsystem is for showing formats only.
541 * They can not be enabled or disabled via the event files.
542 */
Steven Rostedta1d0ce82010-06-08 11:22:06 -0400543 if (call->class && call->class->reg)
Steven Rostedtae63b312012-05-03 23:09:03 -0400544 return file;
Steven Rostedt40e26812009-03-10 11:32:40 -0400545 }
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500546
Li Zefan30bd39c2009-09-18 14:07:05 +0800547 return NULL;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500548}
549
550static void *t_start(struct seq_file *m, loff_t *pos)
551{
Steven Rostedtae63b312012-05-03 23:09:03 -0400552 struct ftrace_event_file *file;
553 struct trace_array *tr = m->private;
Li Zefane1c7e2a2009-06-24 09:52:29 +0800554 loff_t l;
555
Li Zefan20c89282009-05-06 10:33:45 +0800556 mutex_lock(&event_mutex);
Li Zefane1c7e2a2009-06-24 09:52:29 +0800557
Steven Rostedtae63b312012-05-03 23:09:03 -0400558 file = list_entry(&tr->events, struct ftrace_event_file, list);
Li Zefane1c7e2a2009-06-24 09:52:29 +0800559 for (l = 0; l <= *pos; ) {
Steven Rostedtae63b312012-05-03 23:09:03 -0400560 file = t_next(m, file, &l);
561 if (!file)
Li Zefane1c7e2a2009-06-24 09:52:29 +0800562 break;
563 }
Steven Rostedtae63b312012-05-03 23:09:03 -0400564 return file;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500565}
566
567static void *
568s_next(struct seq_file *m, void *v, loff_t *pos)
569{
Steven Rostedtae63b312012-05-03 23:09:03 -0400570 struct ftrace_event_file *file = v;
571 struct trace_array *tr = m->private;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500572
573 (*pos)++;
574
Steven Rostedtae63b312012-05-03 23:09:03 -0400575 list_for_each_entry_continue(file, &tr->events, list) {
576 if (file->flags & FTRACE_EVENT_FL_ENABLED)
577 return file;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500578 }
579
Li Zefan30bd39c2009-09-18 14:07:05 +0800580 return NULL;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500581}
582
583static void *s_start(struct seq_file *m, loff_t *pos)
584{
Steven Rostedtae63b312012-05-03 23:09:03 -0400585 struct ftrace_event_file *file;
586 struct trace_array *tr = m->private;
Li Zefane1c7e2a2009-06-24 09:52:29 +0800587 loff_t l;
588
Li Zefan20c89282009-05-06 10:33:45 +0800589 mutex_lock(&event_mutex);
Li Zefane1c7e2a2009-06-24 09:52:29 +0800590
Steven Rostedtae63b312012-05-03 23:09:03 -0400591 file = list_entry(&tr->events, struct ftrace_event_file, list);
Li Zefane1c7e2a2009-06-24 09:52:29 +0800592 for (l = 0; l <= *pos; ) {
Steven Rostedtae63b312012-05-03 23:09:03 -0400593 file = s_next(m, file, &l);
594 if (!file)
Li Zefane1c7e2a2009-06-24 09:52:29 +0800595 break;
596 }
Steven Rostedtae63b312012-05-03 23:09:03 -0400597 return file;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500598}
599
600static int t_show(struct seq_file *m, void *v)
601{
Steven Rostedtae63b312012-05-03 23:09:03 -0400602 struct ftrace_event_file *file = v;
603 struct ftrace_event_call *call = file->event_call;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500604
Steven Rostedt8f082012010-04-20 10:47:33 -0400605 if (strcmp(call->class->system, TRACE_SYSTEM) != 0)
606 seq_printf(m, "%s:", call->class->system);
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500607 seq_printf(m, "%s\n", call->name);
608
609 return 0;
610}
611
612static void t_stop(struct seq_file *m, void *p)
613{
Li Zefan20c89282009-05-06 10:33:45 +0800614 mutex_unlock(&event_mutex);
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500615}
616
Steven Rostedt1473e442009-02-24 14:15:08 -0500617static ssize_t
618event_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
619 loff_t *ppos)
620{
Steven Rostedtae63b312012-05-03 23:09:03 -0400621 struct ftrace_event_file *file = filp->private_data;
Steven Rostedt1473e442009-02-24 14:15:08 -0500622 char *buf;
623
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400624 if (file->flags & FTRACE_EVENT_FL_ENABLED) {
625 if (file->flags & FTRACE_EVENT_FL_SOFT_DISABLED)
626 buf = "0*\n";
Masami Hiramatsu30052172013-05-09 14:44:26 +0900627 else if (file->flags & FTRACE_EVENT_FL_SOFT_MODE)
628 buf = "1*\n";
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400629 else
630 buf = "1\n";
631 } else
Steven Rostedt1473e442009-02-24 14:15:08 -0500632 buf = "0\n";
633
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400634 return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf));
Steven Rostedt1473e442009-02-24 14:15:08 -0500635}
636
637static ssize_t
638event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
639 loff_t *ppos)
640{
Steven Rostedtae63b312012-05-03 23:09:03 -0400641 struct ftrace_event_file *file = filp->private_data;
Steven Rostedt1473e442009-02-24 14:15:08 -0500642 unsigned long val;
643 int ret;
644
Steven Rostedtae63b312012-05-03 23:09:03 -0400645 if (!file)
646 return -EINVAL;
647
Peter Huewe22fe9b52011-06-07 21:58:27 +0200648 ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
649 if (ret)
Steven Rostedt1473e442009-02-24 14:15:08 -0500650 return ret;
651
Steven Rostedt1852fcc2009-03-11 14:33:00 -0400652 ret = tracing_update_buffers();
653 if (ret < 0)
654 return ret;
655
Steven Rostedt1473e442009-02-24 14:15:08 -0500656 switch (val) {
657 case 0:
Steven Rostedt1473e442009-02-24 14:15:08 -0500658 case 1:
Steven Rostedt11a241a2009-03-02 11:49:04 -0500659 mutex_lock(&event_mutex);
Steven Rostedtae63b312012-05-03 23:09:03 -0400660 ret = ftrace_event_enable_disable(file, val);
Steven Rostedt11a241a2009-03-02 11:49:04 -0500661 mutex_unlock(&event_mutex);
Steven Rostedt1473e442009-02-24 14:15:08 -0500662 break;
663
664 default:
665 return -EINVAL;
666 }
667
668 *ppos += cnt;
669
Li Zefan3b8e4272009-12-08 11:14:52 +0800670 return ret ? ret : cnt;
Steven Rostedt1473e442009-02-24 14:15:08 -0500671}
672
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400673static ssize_t
674system_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
675 loff_t *ppos)
676{
Li Zefanc142b152009-05-08 10:32:05 +0800677 const char set_to_char[4] = { '?', '0', '1', 'X' };
Steven Rostedtae63b312012-05-03 23:09:03 -0400678 struct ftrace_subsystem_dir *dir = filp->private_data;
679 struct event_subsystem *system = dir->subsystem;
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400680 struct ftrace_event_call *call;
Steven Rostedtae63b312012-05-03 23:09:03 -0400681 struct ftrace_event_file *file;
682 struct trace_array *tr = dir->tr;
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400683 char buf[2];
Li Zefanc142b152009-05-08 10:32:05 +0800684 int set = 0;
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400685 int ret;
686
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400687 mutex_lock(&event_mutex);
Steven Rostedtae63b312012-05-03 23:09:03 -0400688 list_for_each_entry(file, &tr->events, list) {
689 call = file->event_call;
Steven Rostedta1d0ce82010-06-08 11:22:06 -0400690 if (!call->name || !call->class || !call->class->reg)
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400691 continue;
692
Steven Rostedt40ee4df2011-07-05 14:32:51 -0400693 if (system && strcmp(call->class->system, system->name) != 0)
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400694 continue;
695
696 /*
697 * We need to find out if all the events are set
698 * or if all events or cleared, or if we have
699 * a mixture.
700 */
Steven Rostedtae63b312012-05-03 23:09:03 -0400701 set |= (1 << !!(file->flags & FTRACE_EVENT_FL_ENABLED));
Li Zefanc142b152009-05-08 10:32:05 +0800702
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400703 /*
704 * If we have a mixture, no need to look further.
705 */
Li Zefanc142b152009-05-08 10:32:05 +0800706 if (set == 3)
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400707 break;
708 }
709 mutex_unlock(&event_mutex);
710
Li Zefanc142b152009-05-08 10:32:05 +0800711 buf[0] = set_to_char[set];
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400712 buf[1] = '\n';
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400713
714 ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2);
715
716 return ret;
717}
718
719static ssize_t
720system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
721 loff_t *ppos)
722{
Steven Rostedtae63b312012-05-03 23:09:03 -0400723 struct ftrace_subsystem_dir *dir = filp->private_data;
724 struct event_subsystem *system = dir->subsystem;
Steven Rostedt40ee4df2011-07-05 14:32:51 -0400725 const char *name = NULL;
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400726 unsigned long val;
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400727 ssize_t ret;
728
Peter Huewe22fe9b52011-06-07 21:58:27 +0200729 ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
730 if (ret)
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400731 return ret;
732
733 ret = tracing_update_buffers();
734 if (ret < 0)
735 return ret;
736
Li Zefan8f31bfe2009-05-08 10:31:42 +0800737 if (val != 0 && val != 1)
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400738 return -EINVAL;
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400739
Steven Rostedt40ee4df2011-07-05 14:32:51 -0400740 /*
741 * Opening of "enable" adds a ref count to system,
742 * so the name is safe to use.
743 */
744 if (system)
745 name = system->name;
746
Steven Rostedtae63b312012-05-03 23:09:03 -0400747 ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val);
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400748 if (ret)
Li Zefan8f31bfe2009-05-08 10:31:42 +0800749 goto out;
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400750
751 ret = cnt;
752
Li Zefan8f31bfe2009-05-08 10:31:42 +0800753out:
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400754 *ppos += cnt;
755
756 return ret;
757}
758
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400759enum {
760 FORMAT_HEADER = 1,
Li Zefan86397dc2010-08-17 13:53:06 +0800761 FORMAT_FIELD_SEPERATOR = 2,
762 FORMAT_PRINTFMT = 3,
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400763};
764
765static void *f_next(struct seq_file *m, void *v, loff_t *pos)
Steven Rostedt981d0812009-03-02 13:53:59 -0500766{
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400767 struct ftrace_event_call *call = m->private;
Lai Jiangshan5a65e952009-12-15 15:39:53 +0800768 struct ftrace_event_field *field;
Li Zefan86397dc2010-08-17 13:53:06 +0800769 struct list_head *common_head = &ftrace_common_fields;
770 struct list_head *head = trace_get_fields(call);
Steven Rostedt981d0812009-03-02 13:53:59 -0500771
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400772 (*pos)++;
Lai Jiangshan5a65e952009-12-15 15:39:53 +0800773
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400774 switch ((unsigned long)v) {
775 case FORMAT_HEADER:
Li Zefan86397dc2010-08-17 13:53:06 +0800776 if (unlikely(list_empty(common_head)))
777 return NULL;
Lai Jiangshan5a65e952009-12-15 15:39:53 +0800778
Li Zefan86397dc2010-08-17 13:53:06 +0800779 field = list_entry(common_head->prev,
780 struct ftrace_event_field, link);
781 return field;
782
783 case FORMAT_FIELD_SEPERATOR:
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400784 if (unlikely(list_empty(head)))
785 return NULL;
Lai Jiangshan5a65e952009-12-15 15:39:53 +0800786
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400787 field = list_entry(head->prev, struct ftrace_event_field, link);
788 return field;
Lai Jiangshan5a65e952009-12-15 15:39:53 +0800789
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400790 case FORMAT_PRINTFMT:
791 /* all done */
792 return NULL;
Lai Jiangshan5a65e952009-12-15 15:39:53 +0800793 }
794
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400795 field = v;
Li Zefan86397dc2010-08-17 13:53:06 +0800796 if (field->link.prev == common_head)
797 return (void *)FORMAT_FIELD_SEPERATOR;
798 else if (field->link.prev == head)
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400799 return (void *)FORMAT_PRINTFMT;
800
801 field = list_entry(field->link.prev, struct ftrace_event_field, link);
802
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400803 return field;
Li Zefan8728fe52010-05-24 16:22:49 +0800804}
Lai Jiangshan5a65e952009-12-15 15:39:53 +0800805
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400806static void *f_start(struct seq_file *m, loff_t *pos)
Li Zefan8728fe52010-05-24 16:22:49 +0800807{
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400808 loff_t l = 0;
809 void *p;
Li Zefan8728fe52010-05-24 16:22:49 +0800810
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400811 /* Start by showing the header */
812 if (!*pos)
813 return (void *)FORMAT_HEADER;
814
815 p = (void *)FORMAT_HEADER;
816 do {
817 p = f_next(m, p, &l);
818 } while (p && l < *pos);
819
820 return p;
821}
822
823static int f_show(struct seq_file *m, void *v)
824{
825 struct ftrace_event_call *call = m->private;
826 struct ftrace_event_field *field;
827 const char *array_descriptor;
828
829 switch ((unsigned long)v) {
830 case FORMAT_HEADER:
831 seq_printf(m, "name: %s\n", call->name);
832 seq_printf(m, "ID: %d\n", call->event.type);
833 seq_printf(m, "format:\n");
Li Zefan8728fe52010-05-24 16:22:49 +0800834 return 0;
835
Li Zefan86397dc2010-08-17 13:53:06 +0800836 case FORMAT_FIELD_SEPERATOR:
837 seq_putc(m, '\n');
838 return 0;
839
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400840 case FORMAT_PRINTFMT:
841 seq_printf(m, "\nprint fmt: %s\n",
842 call->print_fmt);
843 return 0;
Steven Rostedt981d0812009-03-02 13:53:59 -0500844 }
845
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400846 field = v;
847
848 /*
849 * Smartly shows the array type(except dynamic array).
850 * Normal:
851 * field:TYPE VAR
852 * If TYPE := TYPE[LEN], it is shown:
853 * field:TYPE VAR[LEN]
854 */
855 array_descriptor = strchr(field->type, '[');
856
857 if (!strncmp(field->type, "__data_loc", 10))
858 array_descriptor = NULL;
859
860 if (!array_descriptor)
861 seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n",
862 field->type, field->name, field->offset,
863 field->size, !!field->is_signed);
864 else
865 seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n",
866 (int)(array_descriptor - field->type),
867 field->type, field->name,
868 array_descriptor, field->offset,
869 field->size, !!field->is_signed);
870
871 return 0;
872}
873
874static void f_stop(struct seq_file *m, void *p)
875{
876}
877
878static const struct seq_operations trace_format_seq_ops = {
879 .start = f_start,
880 .next = f_next,
881 .stop = f_stop,
882 .show = f_show,
883};
884
885static int trace_format_open(struct inode *inode, struct file *file)
886{
887 struct ftrace_event_call *call = inode->i_private;
888 struct seq_file *m;
889 int ret;
890
891 ret = seq_open(file, &trace_format_seq_ops);
892 if (ret < 0)
893 return ret;
894
895 m = file->private_data;
896 m->private = call;
897
898 return 0;
Steven Rostedt981d0812009-03-02 13:53:59 -0500899}
900
Peter Zijlstra23725ae2009-03-19 20:26:13 +0100901static ssize_t
902event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)
903{
904 struct ftrace_event_call *call = filp->private_data;
905 struct trace_seq *s;
906 int r;
907
908 if (*ppos)
909 return 0;
910
911 s = kmalloc(sizeof(*s), GFP_KERNEL);
912 if (!s)
913 return -ENOMEM;
914
915 trace_seq_init(s);
Steven Rostedt32c0eda2010-04-23 10:38:03 -0400916 trace_seq_printf(s, "%d\n", call->event.type);
Peter Zijlstra23725ae2009-03-19 20:26:13 +0100917
918 r = simple_read_from_buffer(ubuf, cnt, ppos,
919 s->buffer, s->len);
920 kfree(s);
921 return r;
922}
923
Tom Zanussi7ce7e422009-03-22 03:31:04 -0500924static ssize_t
925event_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
926 loff_t *ppos)
927{
928 struct ftrace_event_call *call = filp->private_data;
929 struct trace_seq *s;
930 int r;
931
932 if (*ppos)
933 return 0;
934
935 s = kmalloc(sizeof(*s), GFP_KERNEL);
936 if (!s)
937 return -ENOMEM;
938
939 trace_seq_init(s);
940
Tom Zanussi8b372562009-04-28 03:04:59 -0500941 print_event_filter(call, s);
Tom Zanussi4bda2d52009-03-24 02:14:31 -0500942 r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
Tom Zanussi7ce7e422009-03-22 03:31:04 -0500943
944 kfree(s);
945
946 return r;
947}
948
949static ssize_t
950event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
951 loff_t *ppos)
952{
953 struct ftrace_event_call *call = filp->private_data;
Tom Zanussi8b372562009-04-28 03:04:59 -0500954 char *buf;
Tom Zanussi7ce7e422009-03-22 03:31:04 -0500955 int err;
956
Tom Zanussi8b372562009-04-28 03:04:59 -0500957 if (cnt >= PAGE_SIZE)
Tom Zanussi7ce7e422009-03-22 03:31:04 -0500958 return -EINVAL;
959
Tom Zanussi8b372562009-04-28 03:04:59 -0500960 buf = (char *)__get_free_page(GFP_TEMPORARY);
961 if (!buf)
Tom Zanussi7ce7e422009-03-22 03:31:04 -0500962 return -ENOMEM;
963
Tom Zanussi8b372562009-04-28 03:04:59 -0500964 if (copy_from_user(buf, ubuf, cnt)) {
965 free_page((unsigned long) buf);
966 return -EFAULT;
967 }
968 buf[cnt] = '\0';
969
970 err = apply_event_filter(call, buf);
971 free_page((unsigned long) buf);
972 if (err < 0)
Tom Zanussi7ce7e422009-03-22 03:31:04 -0500973 return err;
Tom Zanussi0a19e532009-04-13 03:17:50 -0500974
Tom Zanussi7ce7e422009-03-22 03:31:04 -0500975 *ppos += cnt;
976
977 return cnt;
978}
979
Steven Rostedte9dbfae2011-07-05 11:36:06 -0400980static LIST_HEAD(event_subsystems);
981
982static int subsystem_open(struct inode *inode, struct file *filp)
983{
984 struct event_subsystem *system = NULL;
Steven Rostedtae63b312012-05-03 23:09:03 -0400985 struct ftrace_subsystem_dir *dir = NULL; /* Initialize for gcc */
986 struct trace_array *tr;
Steven Rostedte9dbfae2011-07-05 11:36:06 -0400987 int ret;
988
989 /* Make sure the system still exists */
990 mutex_lock(&event_mutex);
Steven Rostedtae63b312012-05-03 23:09:03 -0400991 list_for_each_entry(tr, &ftrace_trace_arrays, list) {
992 list_for_each_entry(dir, &tr->systems, list) {
993 if (dir == inode->i_private) {
994 /* Don't open systems with no events */
995 if (dir->nr_events) {
996 __get_system_dir(dir);
997 system = dir->subsystem;
998 }
999 goto exit_loop;
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001000 }
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001001 }
1002 }
Steven Rostedtae63b312012-05-03 23:09:03 -04001003 exit_loop:
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001004 mutex_unlock(&event_mutex);
1005
Steven Rostedtae63b312012-05-03 23:09:03 -04001006 if (!system)
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001007 return -ENODEV;
1008
Steven Rostedtae63b312012-05-03 23:09:03 -04001009 /* Some versions of gcc think dir can be uninitialized here */
1010 WARN_ON(!dir);
1011
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001012 ret = tracing_open_generic(inode, filp);
Steven Rostedtae63b312012-05-03 23:09:03 -04001013 if (ret < 0)
1014 put_system(dir);
1015
1016 return ret;
1017}
1018
1019static int system_tr_open(struct inode *inode, struct file *filp)
1020{
1021 struct ftrace_subsystem_dir *dir;
1022 struct trace_array *tr = inode->i_private;
1023 int ret;
1024
1025 /* Make a temporary dir that has no system but points to tr */
1026 dir = kzalloc(sizeof(*dir), GFP_KERNEL);
1027 if (!dir)
1028 return -ENOMEM;
1029
1030 dir->tr = tr;
1031
1032 ret = tracing_open_generic(inode, filp);
1033 if (ret < 0)
1034 kfree(dir);
1035
1036 filp->private_data = dir;
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001037
1038 return ret;
1039}
1040
1041static int subsystem_release(struct inode *inode, struct file *file)
1042{
Steven Rostedtae63b312012-05-03 23:09:03 -04001043 struct ftrace_subsystem_dir *dir = file->private_data;
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001044
Steven Rostedtae63b312012-05-03 23:09:03 -04001045 /*
1046 * If dir->subsystem is NULL, then this is a temporary
1047 * descriptor that was made for a trace_array to enable
1048 * all subsystems.
1049 */
1050 if (dir->subsystem)
1051 put_system(dir);
1052 else
1053 kfree(dir);
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001054
1055 return 0;
1056}
1057
Tom Zanussicfb180f2009-03-22 03:31:17 -05001058static ssize_t
1059subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
1060 loff_t *ppos)
1061{
Steven Rostedtae63b312012-05-03 23:09:03 -04001062 struct ftrace_subsystem_dir *dir = filp->private_data;
1063 struct event_subsystem *system = dir->subsystem;
Tom Zanussicfb180f2009-03-22 03:31:17 -05001064 struct trace_seq *s;
1065 int r;
1066
1067 if (*ppos)
1068 return 0;
1069
1070 s = kmalloc(sizeof(*s), GFP_KERNEL);
1071 if (!s)
1072 return -ENOMEM;
1073
1074 trace_seq_init(s);
1075
Tom Zanussi8b372562009-04-28 03:04:59 -05001076 print_subsystem_event_filter(system, s);
Tom Zanussi4bda2d52009-03-24 02:14:31 -05001077 r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
Tom Zanussicfb180f2009-03-22 03:31:17 -05001078
1079 kfree(s);
1080
1081 return r;
1082}
1083
1084static ssize_t
1085subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
1086 loff_t *ppos)
1087{
Steven Rostedtae63b312012-05-03 23:09:03 -04001088 struct ftrace_subsystem_dir *dir = filp->private_data;
Tom Zanussi8b372562009-04-28 03:04:59 -05001089 char *buf;
Tom Zanussicfb180f2009-03-22 03:31:17 -05001090 int err;
1091
Tom Zanussi8b372562009-04-28 03:04:59 -05001092 if (cnt >= PAGE_SIZE)
Tom Zanussicfb180f2009-03-22 03:31:17 -05001093 return -EINVAL;
1094
Tom Zanussi8b372562009-04-28 03:04:59 -05001095 buf = (char *)__get_free_page(GFP_TEMPORARY);
1096 if (!buf)
Tom Zanussicfb180f2009-03-22 03:31:17 -05001097 return -ENOMEM;
1098
Tom Zanussi8b372562009-04-28 03:04:59 -05001099 if (copy_from_user(buf, ubuf, cnt)) {
1100 free_page((unsigned long) buf);
1101 return -EFAULT;
Tom Zanussicfb180f2009-03-22 03:31:17 -05001102 }
Tom Zanussi8b372562009-04-28 03:04:59 -05001103 buf[cnt] = '\0';
Tom Zanussicfb180f2009-03-22 03:31:17 -05001104
Steven Rostedtae63b312012-05-03 23:09:03 -04001105 err = apply_subsystem_event_filter(dir, buf);
Tom Zanussi8b372562009-04-28 03:04:59 -05001106 free_page((unsigned long) buf);
1107 if (err < 0)
Li Zefan44e9c8b2009-04-11 15:55:28 +08001108 return err;
Tom Zanussicfb180f2009-03-22 03:31:17 -05001109
1110 *ppos += cnt;
1111
1112 return cnt;
1113}
1114
Steven Rostedtd1b182a2009-04-15 16:53:47 -04001115static ssize_t
1116show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)
1117{
1118 int (*func)(struct trace_seq *s) = filp->private_data;
1119 struct trace_seq *s;
1120 int r;
1121
1122 if (*ppos)
1123 return 0;
1124
1125 s = kmalloc(sizeof(*s), GFP_KERNEL);
1126 if (!s)
1127 return -ENOMEM;
1128
1129 trace_seq_init(s);
1130
1131 func(s);
1132 r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
1133
1134 kfree(s);
1135
1136 return r;
1137}
1138
Steven Rostedt15075ca2012-05-03 14:57:28 -04001139static int ftrace_event_avail_open(struct inode *inode, struct file *file);
1140static int ftrace_event_set_open(struct inode *inode, struct file *file);
1141
Steven Rostedtb77e38a2009-02-24 10:21:36 -05001142static const struct seq_operations show_event_seq_ops = {
1143 .start = t_start,
1144 .next = t_next,
1145 .show = t_show,
1146 .stop = t_stop,
1147};
1148
1149static const struct seq_operations show_set_event_seq_ops = {
1150 .start = s_start,
1151 .next = s_next,
1152 .show = t_show,
1153 .stop = t_stop,
1154};
1155
Steven Rostedt2314c4a2009-03-10 12:04:02 -04001156static const struct file_operations ftrace_avail_fops = {
Steven Rostedt15075ca2012-05-03 14:57:28 -04001157 .open = ftrace_event_avail_open,
Steven Rostedt2314c4a2009-03-10 12:04:02 -04001158 .read = seq_read,
1159 .llseek = seq_lseek,
1160 .release = seq_release,
1161};
1162
Steven Rostedtb77e38a2009-02-24 10:21:36 -05001163static const struct file_operations ftrace_set_event_fops = {
Steven Rostedt15075ca2012-05-03 14:57:28 -04001164 .open = ftrace_event_set_open,
Steven Rostedtb77e38a2009-02-24 10:21:36 -05001165 .read = seq_read,
1166 .write = ftrace_event_write,
1167 .llseek = seq_lseek,
1168 .release = seq_release,
1169};
1170
Steven Rostedt1473e442009-02-24 14:15:08 -05001171static const struct file_operations ftrace_enable_fops = {
1172 .open = tracing_open_generic,
1173 .read = event_enable_read,
1174 .write = event_enable_write,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001175 .llseek = default_llseek,
Steven Rostedt1473e442009-02-24 14:15:08 -05001176};
1177
Steven Rostedt981d0812009-03-02 13:53:59 -05001178static const struct file_operations ftrace_event_format_fops = {
Steven Rostedt2a37a3d2010-06-03 15:21:34 -04001179 .open = trace_format_open,
1180 .read = seq_read,
1181 .llseek = seq_lseek,
1182 .release = seq_release,
Steven Rostedt981d0812009-03-02 13:53:59 -05001183};
1184
Peter Zijlstra23725ae2009-03-19 20:26:13 +01001185static const struct file_operations ftrace_event_id_fops = {
1186 .open = tracing_open_generic,
1187 .read = event_id_read,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001188 .llseek = default_llseek,
Peter Zijlstra23725ae2009-03-19 20:26:13 +01001189};
1190
Tom Zanussi7ce7e422009-03-22 03:31:04 -05001191static const struct file_operations ftrace_event_filter_fops = {
1192 .open = tracing_open_generic,
1193 .read = event_filter_read,
1194 .write = event_filter_write,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001195 .llseek = default_llseek,
Tom Zanussi7ce7e422009-03-22 03:31:04 -05001196};
1197
Tom Zanussicfb180f2009-03-22 03:31:17 -05001198static const struct file_operations ftrace_subsystem_filter_fops = {
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001199 .open = subsystem_open,
Tom Zanussicfb180f2009-03-22 03:31:17 -05001200 .read = subsystem_filter_read,
1201 .write = subsystem_filter_write,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001202 .llseek = default_llseek,
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001203 .release = subsystem_release,
Tom Zanussicfb180f2009-03-22 03:31:17 -05001204};
1205
Steven Rostedt8ae79a12009-05-06 22:52:15 -04001206static const struct file_operations ftrace_system_enable_fops = {
Steven Rostedt40ee4df2011-07-05 14:32:51 -04001207 .open = subsystem_open,
Steven Rostedt8ae79a12009-05-06 22:52:15 -04001208 .read = system_enable_read,
1209 .write = system_enable_write,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001210 .llseek = default_llseek,
Steven Rostedt40ee4df2011-07-05 14:32:51 -04001211 .release = subsystem_release,
Steven Rostedt8ae79a12009-05-06 22:52:15 -04001212};
1213
Steven Rostedtae63b312012-05-03 23:09:03 -04001214static const struct file_operations ftrace_tr_enable_fops = {
1215 .open = system_tr_open,
1216 .read = system_enable_read,
1217 .write = system_enable_write,
1218 .llseek = default_llseek,
1219 .release = subsystem_release,
1220};
1221
Steven Rostedtd1b182a2009-04-15 16:53:47 -04001222static const struct file_operations ftrace_show_header_fops = {
1223 .open = tracing_open_generic,
1224 .read = show_header,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001225 .llseek = default_llseek,
Steven Rostedtd1b182a2009-04-15 16:53:47 -04001226};
1227
Steven Rostedtae63b312012-05-03 23:09:03 -04001228static int
1229ftrace_event_open(struct inode *inode, struct file *file,
1230 const struct seq_operations *seq_ops)
Steven Rostedt1473e442009-02-24 14:15:08 -05001231{
Steven Rostedtae63b312012-05-03 23:09:03 -04001232 struct seq_file *m;
1233 int ret;
Steven Rostedt1473e442009-02-24 14:15:08 -05001234
Steven Rostedtae63b312012-05-03 23:09:03 -04001235 ret = seq_open(file, seq_ops);
1236 if (ret < 0)
1237 return ret;
1238 m = file->private_data;
1239 /* copy tr over to seq ops */
1240 m->private = inode->i_private;
Steven Rostedt1473e442009-02-24 14:15:08 -05001241
Steven Rostedtae63b312012-05-03 23:09:03 -04001242 return ret;
Steven Rostedt1473e442009-02-24 14:15:08 -05001243}
1244
Steven Rostedt15075ca2012-05-03 14:57:28 -04001245static int
1246ftrace_event_avail_open(struct inode *inode, struct file *file)
1247{
1248 const struct seq_operations *seq_ops = &show_event_seq_ops;
1249
Steven Rostedtae63b312012-05-03 23:09:03 -04001250 return ftrace_event_open(inode, file, seq_ops);
Steven Rostedt15075ca2012-05-03 14:57:28 -04001251}
1252
1253static int
1254ftrace_event_set_open(struct inode *inode, struct file *file)
1255{
1256 const struct seq_operations *seq_ops = &show_set_event_seq_ops;
Steven Rostedtae63b312012-05-03 23:09:03 -04001257 struct trace_array *tr = inode->i_private;
Steven Rostedt15075ca2012-05-03 14:57:28 -04001258
1259 if ((file->f_mode & FMODE_WRITE) &&
1260 (file->f_flags & O_TRUNC))
Steven Rostedtae63b312012-05-03 23:09:03 -04001261 ftrace_clear_events(tr);
Steven Rostedt15075ca2012-05-03 14:57:28 -04001262
Steven Rostedtae63b312012-05-03 23:09:03 -04001263 return ftrace_event_open(inode, file, seq_ops);
Steven Rostedt15075ca2012-05-03 14:57:28 -04001264}
1265
Steven Rostedtae63b312012-05-03 23:09:03 -04001266static struct event_subsystem *
1267create_new_subsystem(const char *name)
Steven Rostedt6ecc2d12009-02-27 21:33:02 -05001268{
1269 struct event_subsystem *system;
Steven Rostedt6ecc2d12009-02-27 21:33:02 -05001270
1271 /* need to create new entry */
1272 system = kmalloc(sizeof(*system), GFP_KERNEL);
Steven Rostedtae63b312012-05-03 23:09:03 -04001273 if (!system)
1274 return NULL;
Steven Rostedt6ecc2d12009-02-27 21:33:02 -05001275
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001276 system->ref_count = 1;
Steven Rostedt92edca02013-02-27 20:41:37 -05001277 system->name = name;
Steven Rostedt6ecc2d12009-02-27 21:33:02 -05001278
Tom Zanussi30e673b2009-04-28 03:04:47 -05001279 system->filter = NULL;
Tom Zanussicfb180f2009-03-22 03:31:17 -05001280
Tom Zanussi8b372562009-04-28 03:04:59 -05001281 system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL);
Steven Rostedtae63b312012-05-03 23:09:03 -04001282 if (!system->filter)
1283 goto out_free;
1284
1285 list_add(&system->list, &event_subsystems);
1286
1287 return system;
1288
1289 out_free:
Steven Rostedtae63b312012-05-03 23:09:03 -04001290 kfree(system);
1291 return NULL;
1292}
1293
1294static struct dentry *
1295event_subsystem_dir(struct trace_array *tr, const char *name,
1296 struct ftrace_event_file *file, struct dentry *parent)
1297{
1298 struct ftrace_subsystem_dir *dir;
1299 struct event_subsystem *system;
1300 struct dentry *entry;
1301
1302 /* First see if we did not already create this dir */
1303 list_for_each_entry(dir, &tr->systems, list) {
1304 system = dir->subsystem;
1305 if (strcmp(system->name, name) == 0) {
1306 dir->nr_events++;
1307 file->system = dir;
1308 return dir->entry;
1309 }
Tom Zanussi8b372562009-04-28 03:04:59 -05001310 }
1311
Steven Rostedtae63b312012-05-03 23:09:03 -04001312 /* Now see if the system itself exists. */
1313 list_for_each_entry(system, &event_subsystems, list) {
1314 if (strcmp(system->name, name) == 0)
1315 break;
1316 }
1317 /* Reset system variable when not found */
1318 if (&system->list == &event_subsystems)
1319 system = NULL;
1320
1321 dir = kmalloc(sizeof(*dir), GFP_KERNEL);
1322 if (!dir)
1323 goto out_fail;
1324
1325 if (!system) {
1326 system = create_new_subsystem(name);
1327 if (!system)
1328 goto out_free;
1329 } else
1330 __get_system(system);
1331
1332 dir->entry = debugfs_create_dir(name, parent);
1333 if (!dir->entry) {
1334 pr_warning("Failed to create system directory %s\n", name);
1335 __put_system(system);
1336 goto out_free;
1337 }
1338
1339 dir->tr = tr;
1340 dir->ref_count = 1;
1341 dir->nr_events = 1;
1342 dir->subsystem = system;
1343 file->system = dir;
1344
1345 entry = debugfs_create_file("filter", 0644, dir->entry, dir,
Tom Zanussie1112b42009-03-31 00:48:49 -05001346 &ftrace_subsystem_filter_fops);
Tom Zanussi8b372562009-04-28 03:04:59 -05001347 if (!entry) {
1348 kfree(system->filter);
1349 system->filter = NULL;
Steven Rostedtae63b312012-05-03 23:09:03 -04001350 pr_warning("Could not create debugfs '%s/filter' entry\n", name);
Tom Zanussi8b372562009-04-28 03:04:59 -05001351 }
Tom Zanussie1112b42009-03-31 00:48:49 -05001352
Steven Rostedtae63b312012-05-03 23:09:03 -04001353 trace_create_file("enable", 0644, dir->entry, dir,
Frederic Weisbeckerf3f3f002009-09-24 15:27:41 +02001354 &ftrace_system_enable_fops);
Steven Rostedt8ae79a12009-05-06 22:52:15 -04001355
Steven Rostedtae63b312012-05-03 23:09:03 -04001356 list_add(&dir->list, &tr->systems);
1357
1358 return dir->entry;
1359
1360 out_free:
1361 kfree(dir);
1362 out_fail:
1363 /* Only print this message if failed on memory allocation */
1364 if (!dir || !system)
1365 pr_warning("No memory to create event subsystem %s\n",
1366 name);
1367 return NULL;
Steven Rostedt6ecc2d12009-02-27 21:33:02 -05001368}
1369
Steven Rostedt1473e442009-02-24 14:15:08 -05001370static int
Steven Rostedtae63b312012-05-03 23:09:03 -04001371event_create_dir(struct dentry *parent,
1372 struct ftrace_event_file *file,
Steven Rostedt701970b2009-04-24 23:11:22 -04001373 const struct file_operations *id,
1374 const struct file_operations *enable,
1375 const struct file_operations *filter,
1376 const struct file_operations *format)
Steven Rostedt1473e442009-02-24 14:15:08 -05001377{
Steven Rostedtae63b312012-05-03 23:09:03 -04001378 struct ftrace_event_call *call = file->event_call;
1379 struct trace_array *tr = file->tr;
Steven Rostedt2e33af02010-04-22 10:35:55 -04001380 struct list_head *head;
Steven Rostedtae63b312012-05-03 23:09:03 -04001381 struct dentry *d_events;
Steven Rostedtfd994982009-02-28 02:41:25 -05001382 int ret;
Steven Rostedt1473e442009-02-24 14:15:08 -05001383
Steven Rostedt6ecc2d12009-02-27 21:33:02 -05001384 /*
1385 * If the trace point header did not define TRACE_SYSTEM
1386 * then the system would be called "TRACE_SYSTEM".
1387 */
Steven Rostedtae63b312012-05-03 23:09:03 -04001388 if (strcmp(call->class->system, TRACE_SYSTEM) != 0) {
1389 d_events = event_subsystem_dir(tr, call->class->system, file, parent);
1390 if (!d_events)
1391 return -ENOMEM;
1392 } else
1393 d_events = parent;
Steven Rostedt6ecc2d12009-02-27 21:33:02 -05001394
Steven Rostedtae63b312012-05-03 23:09:03 -04001395 file->dir = debugfs_create_dir(call->name, d_events);
1396 if (!file->dir) {
1397 pr_warning("Could not create debugfs '%s' directory\n",
1398 call->name);
Steven Rostedt1473e442009-02-24 14:15:08 -05001399 return -1;
1400 }
1401
Steven Rostedt9b637762012-05-10 15:55:43 -04001402 if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE))
Steven Rostedtae63b312012-05-03 23:09:03 -04001403 trace_create_file("enable", 0644, file->dir, file,
Frederic Weisbeckerf3f3f002009-09-24 15:27:41 +02001404 enable);
Steven Rostedt1473e442009-02-24 14:15:08 -05001405
Steven Rostedt22392912010-04-21 12:27:06 -04001406#ifdef CONFIG_PERF_EVENTS
Steven Rostedta1d0ce82010-06-08 11:22:06 -04001407 if (call->event.type && call->class->reg)
Steven Rostedtae63b312012-05-03 23:09:03 -04001408 trace_create_file("id", 0444, file->dir, call,
Frederic Weisbeckerf3f3f002009-09-24 15:27:41 +02001409 id);
Steven Rostedt22392912010-04-21 12:27:06 -04001410#endif
Peter Zijlstra23725ae2009-03-19 20:26:13 +01001411
Li Zefanc9d932c2010-05-24 16:24:28 +08001412 /*
1413 * Other events may have the same class. Only update
1414 * the fields if they are not already defined.
1415 */
1416 head = trace_get_fields(call);
1417 if (list_empty(head)) {
1418 ret = call->class->define_fields(call);
1419 if (ret < 0) {
1420 pr_warning("Could not initialize trace point"
1421 " events/%s\n", call->name);
Steven Rostedtae63b312012-05-03 23:09:03 -04001422 return -1;
Tom Zanussicf027f62009-03-22 03:30:39 -05001423 }
1424 }
Steven Rostedtae63b312012-05-03 23:09:03 -04001425 trace_create_file("filter", 0644, file->dir, call,
Li Zefanc9d932c2010-05-24 16:24:28 +08001426 filter);
Tom Zanussicf027f62009-03-22 03:30:39 -05001427
Steven Rostedtae63b312012-05-03 23:09:03 -04001428 trace_create_file("format", 0444, file->dir, call,
Frederic Weisbeckerf3f3f002009-09-24 15:27:41 +02001429 format);
Steven Rostedtfd994982009-02-28 02:41:25 -05001430
Steven Rostedt1473e442009-02-24 14:15:08 -05001431 return 0;
1432}
1433
Steven Rostedtae63b312012-05-03 23:09:03 -04001434static void remove_subsystem(struct ftrace_subsystem_dir *dir)
1435{
1436 if (!dir)
1437 return;
1438
1439 if (!--dir->nr_events) {
1440 debugfs_remove_recursive(dir->entry);
1441 list_del(&dir->list);
1442 __put_system_dir(dir);
1443 }
1444}
1445
1446static void remove_event_from_tracers(struct ftrace_event_call *call)
1447{
1448 struct ftrace_event_file *file;
1449 struct trace_array *tr;
1450
1451 do_for_each_event_file_safe(tr, file) {
1452
1453 if (file->event_call != call)
1454 continue;
1455
1456 list_del(&file->list);
1457 debugfs_remove_recursive(file->dir);
1458 remove_subsystem(file->system);
Steven Rostedtd1a29142013-02-27 20:23:57 -05001459 kmem_cache_free(file_cachep, file);
Steven Rostedtae63b312012-05-03 23:09:03 -04001460
1461 /*
1462 * The do_for_each_event_file_safe() is
1463 * a double loop. After finding the call for this
1464 * trace_array, we use break to jump to the next
1465 * trace_array.
1466 */
1467 break;
1468 } while_for_each_event_file();
1469}
1470
Ezequiel Garcia87819152012-09-12 11:47:57 -03001471static void event_remove(struct ftrace_event_call *call)
1472{
Steven Rostedtae63b312012-05-03 23:09:03 -04001473 struct trace_array *tr;
1474 struct ftrace_event_file *file;
1475
1476 do_for_each_event_file(tr, file) {
1477 if (file->event_call != call)
1478 continue;
1479 ftrace_event_enable_disable(file, 0);
1480 /*
1481 * The do_for_each_event_file() is
1482 * a double loop. After finding the call for this
1483 * trace_array, we use break to jump to the next
1484 * trace_array.
1485 */
1486 break;
1487 } while_for_each_event_file();
1488
Ezequiel Garcia87819152012-09-12 11:47:57 -03001489 if (call->event.funcs)
1490 __unregister_ftrace_event(&call->event);
Steven Rostedtae63b312012-05-03 23:09:03 -04001491 remove_event_from_tracers(call);
Ezequiel Garcia87819152012-09-12 11:47:57 -03001492 list_del(&call->list);
1493}
1494
1495static int event_init(struct ftrace_event_call *call)
1496{
1497 int ret = 0;
1498
1499 if (WARN_ON(!call->name))
1500 return -EINVAL;
1501
1502 if (call->class->raw_init) {
1503 ret = call->class->raw_init(call);
1504 if (ret < 0 && ret != -ENOSYS)
1505 pr_warn("Could not initialize trace events/%s\n",
1506 call->name);
1507 }
1508
1509 return ret;
1510}
1511
Li Zefan67ead0a2010-05-24 16:25:13 +08001512static int
Steven Rostedtae63b312012-05-03 23:09:03 -04001513__register_event(struct ftrace_event_call *call, struct module *mod)
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001514{
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001515 int ret;
Steven Rostedt6d723732009-04-10 14:53:50 -04001516
Ezequiel Garcia87819152012-09-12 11:47:57 -03001517 ret = event_init(call);
1518 if (ret < 0)
1519 return ret;
Steven Rostedt701970b2009-04-24 23:11:22 -04001520
Steven Rostedtae63b312012-05-03 23:09:03 -04001521 list_add(&call->list, &ftrace_events);
Li Zefan67ead0a2010-05-24 16:25:13 +08001522 call->mod = mod;
Masami Hiramatsu88f70d72009-09-25 11:20:54 -07001523
Steven Rostedtae63b312012-05-03 23:09:03 -04001524 return 0;
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001525}
1526
Steven Rostedt (Red Hat)da511bf2013-05-09 15:00:07 -04001527static struct ftrace_event_file *
1528trace_create_new_event(struct ftrace_event_call *call,
1529 struct trace_array *tr)
1530{
1531 struct ftrace_event_file *file;
1532
1533 file = kmem_cache_alloc(file_cachep, GFP_TRACE);
1534 if (!file)
1535 return NULL;
1536
1537 file->event_call = call;
1538 file->tr = tr;
1539 atomic_set(&file->sm_ref, 0);
1540 list_add(&file->list, &tr->events);
1541
1542 return file;
1543}
1544
Steven Rostedtae63b312012-05-03 23:09:03 -04001545/* Add an event to a trace directory */
1546static int
1547__trace_add_new_event(struct ftrace_event_call *call,
1548 struct trace_array *tr,
1549 const struct file_operations *id,
1550 const struct file_operations *enable,
1551 const struct file_operations *filter,
1552 const struct file_operations *format)
1553{
1554 struct ftrace_event_file *file;
1555
Steven Rostedt (Red Hat)da511bf2013-05-09 15:00:07 -04001556 file = trace_create_new_event(call, tr);
Steven Rostedtae63b312012-05-03 23:09:03 -04001557 if (!file)
1558 return -ENOMEM;
1559
Steven Rostedtae63b312012-05-03 23:09:03 -04001560 return event_create_dir(tr->event_dir, file, id, enable, filter, format);
1561}
1562
Steven Rostedt77248222013-02-27 16:28:06 -05001563/*
1564 * Just create a decriptor for early init. A descriptor is required
1565 * for enabling events at boot. We want to enable events before
1566 * the filesystem is initialized.
1567 */
1568static __init int
1569__trace_early_add_new_event(struct ftrace_event_call *call,
1570 struct trace_array *tr)
1571{
1572 struct ftrace_event_file *file;
1573
Steven Rostedt (Red Hat)da511bf2013-05-09 15:00:07 -04001574 file = trace_create_new_event(call, tr);
Steven Rostedt77248222013-02-27 16:28:06 -05001575 if (!file)
1576 return -ENOMEM;
1577
Steven Rostedt77248222013-02-27 16:28:06 -05001578 return 0;
1579}
1580
Steven Rostedtae63b312012-05-03 23:09:03 -04001581struct ftrace_module_file_ops;
1582static void __add_event_to_tracers(struct ftrace_event_call *call,
1583 struct ftrace_module_file_ops *file_ops);
1584
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001585/* Add an additional event_call dynamically */
1586int trace_add_event_call(struct ftrace_event_call *call)
1587{
1588 int ret;
1589 mutex_lock(&event_mutex);
Steven Rostedtae63b312012-05-03 23:09:03 -04001590
1591 ret = __register_event(call, NULL);
1592 if (ret >= 0)
1593 __add_event_to_tracers(call, NULL);
1594
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001595 mutex_unlock(&event_mutex);
1596 return ret;
1597}
Steven Rostedt701970b2009-04-24 23:11:22 -04001598
Masami Hiramatsu4fead8e2009-09-14 16:49:12 -04001599/*
zhangwei(Jovi)52f6ad62013-03-11 15:14:03 +08001600 * Must be called under locking both of event_mutex and trace_event_sem.
Masami Hiramatsu4fead8e2009-09-14 16:49:12 -04001601 */
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001602static void __trace_remove_event_call(struct ftrace_event_call *call)
1603{
Ezequiel Garcia87819152012-09-12 11:47:57 -03001604 event_remove(call);
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001605 trace_destroy_fields(call);
1606 destroy_preds(call);
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001607}
1608
1609/* Remove an event_call */
1610void trace_remove_event_call(struct ftrace_event_call *call)
1611{
1612 mutex_lock(&event_mutex);
zhangwei(Jovi)52f6ad62013-03-11 15:14:03 +08001613 down_write(&trace_event_sem);
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001614 __trace_remove_event_call(call);
zhangwei(Jovi)52f6ad62013-03-11 15:14:03 +08001615 up_write(&trace_event_sem);
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001616 mutex_unlock(&event_mutex);
1617}
1618
1619#define for_each_event(event, start, end) \
1620 for (event = start; \
1621 (unsigned long)event < (unsigned long)end; \
1622 event++)
1623
1624#ifdef CONFIG_MODULES
1625
1626static LIST_HEAD(ftrace_module_file_list);
1627
1628/*
1629 * Modules must own their file_operations to keep up with
1630 * reference counting.
1631 */
1632struct ftrace_module_file_ops {
1633 struct list_head list;
1634 struct module *mod;
1635 struct file_operations id;
1636 struct file_operations enable;
1637 struct file_operations format;
1638 struct file_operations filter;
1639};
1640
Steven Rostedt (Red Hat)315326c2013-03-02 17:37:14 -05001641static struct ftrace_module_file_ops *
1642find_ftrace_file_ops(struct ftrace_module_file_ops *file_ops, struct module *mod)
Steven Rostedtae63b312012-05-03 23:09:03 -04001643{
Steven Rostedt (Red Hat)315326c2013-03-02 17:37:14 -05001644 /*
1645 * As event_calls are added in groups by module,
1646 * when we find one file_ops, we don't need to search for
1647 * each call in that module, as the rest should be the
1648 * same. Only search for a new one if the last one did
1649 * not match.
1650 */
1651 if (file_ops && mod == file_ops->mod)
1652 return file_ops;
Steven Rostedtae63b312012-05-03 23:09:03 -04001653
1654 list_for_each_entry(file_ops, &ftrace_module_file_list, list) {
1655 if (file_ops->mod == mod)
1656 return file_ops;
1657 }
1658 return NULL;
1659}
1660
Steven Rostedt701970b2009-04-24 23:11:22 -04001661static struct ftrace_module_file_ops *
1662trace_create_file_ops(struct module *mod)
1663{
1664 struct ftrace_module_file_ops *file_ops;
1665
1666 /*
1667 * This is a bit of a PITA. To allow for correct reference
1668 * counting, modules must "own" their file_operations.
1669 * To do this, we allocate the file operations that will be
1670 * used in the event directory.
1671 */
1672
1673 file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL);
1674 if (!file_ops)
1675 return NULL;
1676
1677 file_ops->mod = mod;
1678
1679 file_ops->id = ftrace_event_id_fops;
1680 file_ops->id.owner = mod;
1681
1682 file_ops->enable = ftrace_enable_fops;
1683 file_ops->enable.owner = mod;
1684
1685 file_ops->filter = ftrace_event_filter_fops;
1686 file_ops->filter.owner = mod;
1687
1688 file_ops->format = ftrace_event_format_fops;
1689 file_ops->format.owner = mod;
1690
1691 list_add(&file_ops->list, &ftrace_module_file_list);
1692
1693 return file_ops;
1694}
1695
Steven Rostedt6d723732009-04-10 14:53:50 -04001696static void trace_module_add_events(struct module *mod)
1697{
Steven Rostedt701970b2009-04-24 23:11:22 -04001698 struct ftrace_module_file_ops *file_ops = NULL;
Steven Rostedte4a9ea52011-01-27 09:15:30 -05001699 struct ftrace_event_call **call, **start, **end;
Steven Rostedt6d723732009-04-10 14:53:50 -04001700
1701 start = mod->trace_events;
1702 end = mod->trace_events + mod->num_trace_events;
1703
1704 if (start == end)
1705 return;
1706
Li Zefan67ead0a2010-05-24 16:25:13 +08001707 file_ops = trace_create_file_ops(mod);
1708 if (!file_ops)
Steven Rostedt6d723732009-04-10 14:53:50 -04001709 return;
1710
1711 for_each_event(call, start, end) {
Steven Rostedtae63b312012-05-03 23:09:03 -04001712 __register_event(*call, mod);
1713 __add_event_to_tracers(*call, file_ops);
Steven Rostedt6d723732009-04-10 14:53:50 -04001714 }
1715}
1716
1717static void trace_module_remove_events(struct module *mod)
1718{
Steven Rostedt701970b2009-04-24 23:11:22 -04001719 struct ftrace_module_file_ops *file_ops;
Steven Rostedt6d723732009-04-10 14:53:50 -04001720 struct ftrace_event_call *call, *p;
Steven Rostedt (Red Hat)575380d2013-03-04 23:05:12 -05001721 bool clear_trace = false;
Steven Rostedt6d723732009-04-10 14:53:50 -04001722
zhangwei(Jovi)52f6ad62013-03-11 15:14:03 +08001723 down_write(&trace_event_sem);
Steven Rostedt6d723732009-04-10 14:53:50 -04001724 list_for_each_entry_safe(call, p, &ftrace_events, list) {
1725 if (call->mod == mod) {
Steven Rostedt (Red Hat)575380d2013-03-04 23:05:12 -05001726 if (call->flags & TRACE_EVENT_FL_WAS_ENABLED)
1727 clear_trace = true;
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001728 __trace_remove_event_call(call);
Steven Rostedt6d723732009-04-10 14:53:50 -04001729 }
1730 }
Steven Rostedt701970b2009-04-24 23:11:22 -04001731
1732 /* Now free the file_operations */
1733 list_for_each_entry(file_ops, &ftrace_module_file_list, list) {
1734 if (file_ops->mod == mod)
1735 break;
1736 }
1737 if (&file_ops->list != &ftrace_module_file_list) {
1738 list_del(&file_ops->list);
1739 kfree(file_ops);
1740 }
zhangwei(Jovi)52f6ad62013-03-11 15:14:03 +08001741 up_write(&trace_event_sem);
Steven Rostedt9456f0f2009-05-06 21:54:09 -04001742
1743 /*
1744 * It is safest to reset the ring buffer if the module being unloaded
Steven Rostedt (Red Hat)873c6422013-03-04 23:26:06 -05001745 * registered any events that were used. The only worry is if
1746 * a new module gets loaded, and takes on the same id as the events
1747 * of this module. When printing out the buffer, traced events left
1748 * over from this module may be passed to the new module events and
1749 * unexpected results may occur.
Steven Rostedt9456f0f2009-05-06 21:54:09 -04001750 */
Steven Rostedt (Red Hat)575380d2013-03-04 23:05:12 -05001751 if (clear_trace)
Steven Rostedt (Red Hat)873c6422013-03-04 23:26:06 -05001752 tracing_reset_all_online_cpus();
Steven Rostedt6d723732009-04-10 14:53:50 -04001753}
1754
Steven Rostedt61f919a2009-04-14 18:22:32 -04001755static int trace_module_notify(struct notifier_block *self,
1756 unsigned long val, void *data)
Steven Rostedt6d723732009-04-10 14:53:50 -04001757{
1758 struct module *mod = data;
1759
1760 mutex_lock(&event_mutex);
1761 switch (val) {
1762 case MODULE_STATE_COMING:
1763 trace_module_add_events(mod);
1764 break;
1765 case MODULE_STATE_GOING:
1766 trace_module_remove_events(mod);
1767 break;
1768 }
1769 mutex_unlock(&event_mutex);
1770
1771 return 0;
1772}
Steven Rostedt (Red Hat)315326c2013-03-02 17:37:14 -05001773
1774static int
1775__trace_add_new_mod_event(struct ftrace_event_call *call,
1776 struct trace_array *tr,
1777 struct ftrace_module_file_ops *file_ops)
1778{
1779 return __trace_add_new_event(call, tr,
1780 &file_ops->id, &file_ops->enable,
1781 &file_ops->filter, &file_ops->format);
1782}
1783
Steven Rostedt61f919a2009-04-14 18:22:32 -04001784#else
Steven Rostedt (Red Hat)315326c2013-03-02 17:37:14 -05001785static inline struct ftrace_module_file_ops *
1786find_ftrace_file_ops(struct ftrace_module_file_ops *file_ops, struct module *mod)
Steven Rostedtae63b312012-05-03 23:09:03 -04001787{
1788 return NULL;
1789}
Steven Rostedt (Red Hat)315326c2013-03-02 17:37:14 -05001790static inline int trace_module_notify(struct notifier_block *self,
1791 unsigned long val, void *data)
Steven Rostedt61f919a2009-04-14 18:22:32 -04001792{
1793 return 0;
1794}
Steven Rostedt (Red Hat)315326c2013-03-02 17:37:14 -05001795static inline int
1796__trace_add_new_mod_event(struct ftrace_event_call *call,
1797 struct trace_array *tr,
1798 struct ftrace_module_file_ops *file_ops)
1799{
1800 return -ENODEV;
1801}
Steven Rostedt61f919a2009-04-14 18:22:32 -04001802#endif /* CONFIG_MODULES */
Steven Rostedt6d723732009-04-10 14:53:50 -04001803
Steven Rostedtae63b312012-05-03 23:09:03 -04001804/* Create a new event directory structure for a trace directory. */
1805static void
1806__trace_add_event_dirs(struct trace_array *tr)
1807{
1808 struct ftrace_module_file_ops *file_ops = NULL;
1809 struct ftrace_event_call *call;
1810 int ret;
1811
1812 list_for_each_entry(call, &ftrace_events, list) {
1813 if (call->mod) {
1814 /*
1815 * Directories for events by modules need to
1816 * keep module ref counts when opened (as we don't
1817 * want the module to disappear when reading one
1818 * of these files). The file_ops keep account of
1819 * the module ref count.
Steven Rostedtae63b312012-05-03 23:09:03 -04001820 */
Steven Rostedt (Red Hat)315326c2013-03-02 17:37:14 -05001821 file_ops = find_ftrace_file_ops(file_ops, call->mod);
Steven Rostedtae63b312012-05-03 23:09:03 -04001822 if (!file_ops)
1823 continue; /* Warn? */
Steven Rostedt (Red Hat)315326c2013-03-02 17:37:14 -05001824 ret = __trace_add_new_mod_event(call, tr, file_ops);
Steven Rostedtae63b312012-05-03 23:09:03 -04001825 if (ret < 0)
1826 pr_warning("Could not create directory for event %s\n",
1827 call->name);
1828 continue;
1829 }
1830 ret = __trace_add_new_event(call, tr,
1831 &ftrace_event_id_fops,
1832 &ftrace_enable_fops,
1833 &ftrace_event_filter_fops,
1834 &ftrace_event_format_fops);
1835 if (ret < 0)
1836 pr_warning("Could not create directory for event %s\n",
1837 call->name);
1838 }
1839}
1840
Steven Rostedt (Red Hat)3cd715d2013-03-12 19:35:13 -04001841#ifdef CONFIG_DYNAMIC_FTRACE
1842
1843/* Avoid typos */
1844#define ENABLE_EVENT_STR "enable_event"
1845#define DISABLE_EVENT_STR "disable_event"
1846
1847struct event_probe_data {
1848 struct ftrace_event_file *file;
1849 unsigned long count;
1850 int ref;
1851 bool enable;
1852};
1853
1854static struct ftrace_event_file *
1855find_event_file(struct trace_array *tr, const char *system, const char *event)
1856{
1857 struct ftrace_event_file *file;
1858 struct ftrace_event_call *call;
1859
1860 list_for_each_entry(file, &tr->events, list) {
1861
1862 call = file->event_call;
1863
1864 if (!call->name || !call->class || !call->class->reg)
1865 continue;
1866
1867 if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)
1868 continue;
1869
1870 if (strcmp(event, call->name) == 0 &&
1871 strcmp(system, call->class->system) == 0)
1872 return file;
1873 }
1874 return NULL;
1875}
1876
1877static void
1878event_enable_probe(unsigned long ip, unsigned long parent_ip, void **_data)
1879{
1880 struct event_probe_data **pdata = (struct event_probe_data **)_data;
1881 struct event_probe_data *data = *pdata;
1882
1883 if (!data)
1884 return;
1885
1886 if (data->enable)
1887 clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &data->file->flags);
1888 else
1889 set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &data->file->flags);
1890}
1891
1892static void
1893event_enable_count_probe(unsigned long ip, unsigned long parent_ip, void **_data)
1894{
1895 struct event_probe_data **pdata = (struct event_probe_data **)_data;
1896 struct event_probe_data *data = *pdata;
1897
1898 if (!data)
1899 return;
1900
1901 if (!data->count)
1902 return;
1903
1904 /* Skip if the event is in a state we want to switch to */
1905 if (data->enable == !(data->file->flags & FTRACE_EVENT_FL_SOFT_DISABLED))
1906 return;
1907
1908 if (data->count != -1)
1909 (data->count)--;
1910
1911 event_enable_probe(ip, parent_ip, _data);
1912}
1913
1914static int
1915event_enable_print(struct seq_file *m, unsigned long ip,
1916 struct ftrace_probe_ops *ops, void *_data)
1917{
1918 struct event_probe_data *data = _data;
1919
1920 seq_printf(m, "%ps:", (void *)ip);
1921
1922 seq_printf(m, "%s:%s:%s",
1923 data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR,
1924 data->file->event_call->class->system,
1925 data->file->event_call->name);
1926
1927 if (data->count == -1)
1928 seq_printf(m, ":unlimited\n");
1929 else
1930 seq_printf(m, ":count=%ld\n", data->count);
1931
1932 return 0;
1933}
1934
1935static int
1936event_enable_init(struct ftrace_probe_ops *ops, unsigned long ip,
1937 void **_data)
1938{
1939 struct event_probe_data **pdata = (struct event_probe_data **)_data;
1940 struct event_probe_data *data = *pdata;
1941
1942 data->ref++;
1943 return 0;
1944}
1945
1946static void
1947event_enable_free(struct ftrace_probe_ops *ops, unsigned long ip,
1948 void **_data)
1949{
1950 struct event_probe_data **pdata = (struct event_probe_data **)_data;
1951 struct event_probe_data *data = *pdata;
1952
1953 if (WARN_ON_ONCE(data->ref <= 0))
1954 return;
1955
1956 data->ref--;
1957 if (!data->ref) {
1958 /* Remove the SOFT_MODE flag */
1959 __ftrace_event_enable_disable(data->file, 0, 1);
1960 module_put(data->file->event_call->mod);
1961 kfree(data);
1962 }
1963 *pdata = NULL;
1964}
1965
1966static struct ftrace_probe_ops event_enable_probe_ops = {
1967 .func = event_enable_probe,
1968 .print = event_enable_print,
1969 .init = event_enable_init,
1970 .free = event_enable_free,
1971};
1972
1973static struct ftrace_probe_ops event_enable_count_probe_ops = {
1974 .func = event_enable_count_probe,
1975 .print = event_enable_print,
1976 .init = event_enable_init,
1977 .free = event_enable_free,
1978};
1979
1980static struct ftrace_probe_ops event_disable_probe_ops = {
1981 .func = event_enable_probe,
1982 .print = event_enable_print,
1983 .init = event_enable_init,
1984 .free = event_enable_free,
1985};
1986
1987static struct ftrace_probe_ops event_disable_count_probe_ops = {
1988 .func = event_enable_count_probe,
1989 .print = event_enable_print,
1990 .init = event_enable_init,
1991 .free = event_enable_free,
1992};
1993
1994static int
1995event_enable_func(struct ftrace_hash *hash,
1996 char *glob, char *cmd, char *param, int enabled)
1997{
1998 struct trace_array *tr = top_trace_array();
1999 struct ftrace_event_file *file;
2000 struct ftrace_probe_ops *ops;
2001 struct event_probe_data *data;
2002 const char *system;
2003 const char *event;
2004 char *number;
2005 bool enable;
2006 int ret;
2007
2008 /* hash funcs only work with set_ftrace_filter */
Harsh Prateek Bora8092e802013-05-24 12:52:17 +05302009 if (!enabled || !param)
Steven Rostedt (Red Hat)3cd715d2013-03-12 19:35:13 -04002010 return -EINVAL;
2011
2012 system = strsep(&param, ":");
2013 if (!param)
2014 return -EINVAL;
2015
2016 event = strsep(&param, ":");
2017
2018 mutex_lock(&event_mutex);
2019
2020 ret = -EINVAL;
2021 file = find_event_file(tr, system, event);
2022 if (!file)
2023 goto out;
2024
2025 enable = strcmp(cmd, ENABLE_EVENT_STR) == 0;
2026
2027 if (enable)
2028 ops = param ? &event_enable_count_probe_ops : &event_enable_probe_ops;
2029 else
2030 ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops;
2031
2032 if (glob[0] == '!') {
2033 unregister_ftrace_function_probe_func(glob+1, ops);
2034 ret = 0;
2035 goto out;
2036 }
2037
2038 ret = -ENOMEM;
2039 data = kzalloc(sizeof(*data), GFP_KERNEL);
2040 if (!data)
2041 goto out;
2042
2043 data->enable = enable;
2044 data->count = -1;
2045 data->file = file;
2046
2047 if (!param)
2048 goto out_reg;
2049
2050 number = strsep(&param, ":");
2051
2052 ret = -EINVAL;
2053 if (!strlen(number))
2054 goto out_free;
2055
2056 /*
2057 * We use the callback data field (which is a pointer)
2058 * as our counter.
2059 */
2060 ret = kstrtoul(number, 0, &data->count);
2061 if (ret)
2062 goto out_free;
2063
2064 out_reg:
2065 /* Don't let event modules unload while probe registered */
2066 ret = try_module_get(file->event_call->mod);
Masami Hiramatsu6ed01062013-05-16 20:48:49 +09002067 if (!ret) {
2068 ret = -EBUSY;
Steven Rostedt (Red Hat)3cd715d2013-03-12 19:35:13 -04002069 goto out_free;
Masami Hiramatsu6ed01062013-05-16 20:48:49 +09002070 }
Steven Rostedt (Red Hat)3cd715d2013-03-12 19:35:13 -04002071
2072 ret = __ftrace_event_enable_disable(file, 1, 1);
2073 if (ret < 0)
2074 goto out_put;
2075 ret = register_ftrace_function_probe(glob, ops, data);
Steven Rostedt (Red Hat)ff305de2013-05-09 11:30:26 -04002076 /*
2077 * The above returns on success the # of functions enabled,
2078 * but if it didn't find any functions it returns zero.
2079 * Consider no functions a failure too.
2080 */
Masami Hiramatsua5b85bd2013-05-09 14:44:14 +09002081 if (!ret) {
2082 ret = -ENOENT;
Steven Rostedt (Red Hat)3cd715d2013-03-12 19:35:13 -04002083 goto out_disable;
Steven Rostedt (Red Hat)ff305de2013-05-09 11:30:26 -04002084 } else if (ret < 0)
2085 goto out_disable;
2086 /* Just return zero, not the number of enabled functions */
2087 ret = 0;
Steven Rostedt (Red Hat)3cd715d2013-03-12 19:35:13 -04002088 out:
2089 mutex_unlock(&event_mutex);
2090 return ret;
2091
2092 out_disable:
2093 __ftrace_event_enable_disable(file, 0, 1);
2094 out_put:
2095 module_put(file->event_call->mod);
2096 out_free:
2097 kfree(data);
2098 goto out;
2099}
2100
2101static struct ftrace_func_command event_enable_cmd = {
2102 .name = ENABLE_EVENT_STR,
2103 .func = event_enable_func,
2104};
2105
2106static struct ftrace_func_command event_disable_cmd = {
2107 .name = DISABLE_EVENT_STR,
2108 .func = event_enable_func,
2109};
2110
2111static __init int register_event_cmds(void)
2112{
2113 int ret;
2114
2115 ret = register_ftrace_command(&event_enable_cmd);
2116 if (WARN_ON(ret < 0))
2117 return ret;
2118 ret = register_ftrace_command(&event_disable_cmd);
2119 if (WARN_ON(ret < 0))
2120 unregister_ftrace_command(&event_enable_cmd);
2121 return ret;
2122}
2123#else
2124static inline int register_event_cmds(void) { return 0; }
2125#endif /* CONFIG_DYNAMIC_FTRACE */
2126
Steven Rostedt77248222013-02-27 16:28:06 -05002127/*
2128 * The top level array has already had its ftrace_event_file
2129 * descriptors created in order to allow for early events to
2130 * be recorded. This function is called after the debugfs has been
2131 * initialized, and we now have to create the files associated
2132 * to the events.
2133 */
2134static __init void
2135__trace_early_add_event_dirs(struct trace_array *tr)
2136{
2137 struct ftrace_event_file *file;
2138 int ret;
2139
2140
2141 list_for_each_entry(file, &tr->events, list) {
2142 ret = event_create_dir(tr->event_dir, file,
2143 &ftrace_event_id_fops,
2144 &ftrace_enable_fops,
2145 &ftrace_event_filter_fops,
2146 &ftrace_event_format_fops);
2147 if (ret < 0)
2148 pr_warning("Could not create directory for event %s\n",
2149 file->event_call->name);
2150 }
2151}
2152
2153/*
2154 * For early boot up, the top trace array requires to have
2155 * a list of events that can be enabled. This must be done before
2156 * the filesystem is set up in order to allow events to be traced
2157 * early.
2158 */
2159static __init void
2160__trace_early_add_events(struct trace_array *tr)
2161{
2162 struct ftrace_event_call *call;
2163 int ret;
2164
2165 list_for_each_entry(call, &ftrace_events, list) {
2166 /* Early boot up should not have any modules loaded */
2167 if (WARN_ON_ONCE(call->mod))
2168 continue;
2169
2170 ret = __trace_early_add_new_event(call, tr);
2171 if (ret < 0)
2172 pr_warning("Could not create early event %s\n",
2173 call->name);
2174 }
2175}
2176
Steven Rostedt0c8916c2012-08-07 16:14:16 -04002177/* Remove the event directory structure for a trace directory. */
2178static void
2179__trace_remove_event_dirs(struct trace_array *tr)
2180{
2181 struct ftrace_event_file *file, *next;
2182
2183 list_for_each_entry_safe(file, next, &tr->events, list) {
2184 list_del(&file->list);
2185 debugfs_remove_recursive(file->dir);
2186 remove_subsystem(file->system);
Steven Rostedtd1a29142013-02-27 20:23:57 -05002187 kmem_cache_free(file_cachep, file);
Steven Rostedt0c8916c2012-08-07 16:14:16 -04002188 }
2189}
2190
Steven Rostedtae63b312012-05-03 23:09:03 -04002191static void
2192__add_event_to_tracers(struct ftrace_event_call *call,
2193 struct ftrace_module_file_ops *file_ops)
2194{
2195 struct trace_array *tr;
2196
2197 list_for_each_entry(tr, &ftrace_trace_arrays, list) {
2198 if (file_ops)
Steven Rostedt (Red Hat)315326c2013-03-02 17:37:14 -05002199 __trace_add_new_mod_event(call, tr, file_ops);
Steven Rostedtae63b312012-05-03 23:09:03 -04002200 else
2201 __trace_add_new_event(call, tr,
2202 &ftrace_event_id_fops,
2203 &ftrace_enable_fops,
2204 &ftrace_event_filter_fops,
2205 &ftrace_event_format_fops);
2206 }
2207}
2208
Steven Rostedtec827c72009-09-14 10:50:23 -04002209static struct notifier_block trace_module_nb = {
Steven Rostedt6d723732009-04-10 14:53:50 -04002210 .notifier_call = trace_module_notify,
2211 .priority = 0,
2212};
2213
Steven Rostedte4a9ea52011-01-27 09:15:30 -05002214extern struct ftrace_event_call *__start_ftrace_events[];
2215extern struct ftrace_event_call *__stop_ftrace_events[];
Steven Rostedta59fd602009-04-10 13:52:20 -04002216
Li Zefan020e5f82009-07-01 10:47:05 +08002217static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata;
2218
2219static __init int setup_trace_event(char *str)
2220{
2221 strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE);
Steven Rostedt (Red Hat)55034cd2013-03-07 22:48:09 -05002222 ring_buffer_expanded = true;
2223 tracing_selftest_disabled = true;
Li Zefan020e5f82009-07-01 10:47:05 +08002224
2225 return 1;
2226}
2227__setup("trace_event=", setup_trace_event);
2228
Steven Rostedt77248222013-02-27 16:28:06 -05002229/* Expects to have event_mutex held when called */
2230static int
2231create_event_toplevel_files(struct dentry *parent, struct trace_array *tr)
Steven Rostedtae63b312012-05-03 23:09:03 -04002232{
2233 struct dentry *d_events;
2234 struct dentry *entry;
2235
2236 entry = debugfs_create_file("set_event", 0644, parent,
2237 tr, &ftrace_set_event_fops);
2238 if (!entry) {
2239 pr_warning("Could not create debugfs 'set_event' entry\n");
2240 return -ENOMEM;
2241 }
2242
2243 d_events = debugfs_create_dir("events", parent);
Steven Rostedt277ba042012-08-03 16:10:49 -04002244 if (!d_events) {
Steven Rostedtae63b312012-05-03 23:09:03 -04002245 pr_warning("Could not create debugfs 'events' directory\n");
Steven Rostedt277ba042012-08-03 16:10:49 -04002246 return -ENOMEM;
2247 }
Steven Rostedtae63b312012-05-03 23:09:03 -04002248
2249 /* ring buffer internal formats */
2250 trace_create_file("header_page", 0444, d_events,
2251 ring_buffer_print_page_header,
2252 &ftrace_show_header_fops);
2253
2254 trace_create_file("header_event", 0444, d_events,
2255 ring_buffer_print_entry_header,
2256 &ftrace_show_header_fops);
2257
2258 trace_create_file("enable", 0644, d_events,
2259 tr, &ftrace_tr_enable_fops);
2260
2261 tr->event_dir = d_events;
Steven Rostedt77248222013-02-27 16:28:06 -05002262
2263 return 0;
2264}
2265
2266/**
2267 * event_trace_add_tracer - add a instance of a trace_array to events
2268 * @parent: The parent dentry to place the files/directories for events in
2269 * @tr: The trace array associated with these events
2270 *
2271 * When a new instance is created, it needs to set up its events
2272 * directory, as well as other files associated with events. It also
2273 * creates the event hierachry in the @parent/events directory.
2274 *
2275 * Returns 0 on success.
2276 */
2277int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr)
2278{
2279 int ret;
2280
2281 mutex_lock(&event_mutex);
2282
2283 ret = create_event_toplevel_files(parent, tr);
2284 if (ret)
2285 goto out_unlock;
2286
zhangwei(Jovi)52f6ad62013-03-11 15:14:03 +08002287 down_write(&trace_event_sem);
Steven Rostedtae63b312012-05-03 23:09:03 -04002288 __trace_add_event_dirs(tr);
zhangwei(Jovi)52f6ad62013-03-11 15:14:03 +08002289 up_write(&trace_event_sem);
Steven Rostedt277ba042012-08-03 16:10:49 -04002290
Steven Rostedt77248222013-02-27 16:28:06 -05002291 out_unlock:
Steven Rostedt277ba042012-08-03 16:10:49 -04002292 mutex_unlock(&event_mutex);
Steven Rostedtae63b312012-05-03 23:09:03 -04002293
Steven Rostedt77248222013-02-27 16:28:06 -05002294 return ret;
2295}
2296
2297/*
2298 * The top trace array already had its file descriptors created.
2299 * Now the files themselves need to be created.
2300 */
2301static __init int
2302early_event_add_tracer(struct dentry *parent, struct trace_array *tr)
2303{
2304 int ret;
2305
2306 mutex_lock(&event_mutex);
2307
2308 ret = create_event_toplevel_files(parent, tr);
2309 if (ret)
2310 goto out_unlock;
2311
zhangwei(Jovi)52f6ad62013-03-11 15:14:03 +08002312 down_write(&trace_event_sem);
Steven Rostedt77248222013-02-27 16:28:06 -05002313 __trace_early_add_event_dirs(tr);
zhangwei(Jovi)52f6ad62013-03-11 15:14:03 +08002314 up_write(&trace_event_sem);
Steven Rostedt77248222013-02-27 16:28:06 -05002315
2316 out_unlock:
2317 mutex_unlock(&event_mutex);
2318
2319 return ret;
Steven Rostedtae63b312012-05-03 23:09:03 -04002320}
2321
Steven Rostedt0c8916c2012-08-07 16:14:16 -04002322int event_trace_del_tracer(struct trace_array *tr)
2323{
2324 /* Disable any running events */
2325 __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0);
2326
2327 mutex_lock(&event_mutex);
2328
zhangwei(Jovi)52f6ad62013-03-11 15:14:03 +08002329 down_write(&trace_event_sem);
Steven Rostedt0c8916c2012-08-07 16:14:16 -04002330 __trace_remove_event_dirs(tr);
2331 debugfs_remove_recursive(tr->event_dir);
zhangwei(Jovi)52f6ad62013-03-11 15:14:03 +08002332 up_write(&trace_event_sem);
Steven Rostedt0c8916c2012-08-07 16:14:16 -04002333
2334 tr->event_dir = NULL;
2335
2336 mutex_unlock(&event_mutex);
2337
2338 return 0;
2339}
2340
Steven Rostedtd1a29142013-02-27 20:23:57 -05002341static __init int event_trace_memsetup(void)
2342{
2343 field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC);
2344 file_cachep = KMEM_CACHE(ftrace_event_file, SLAB_PANIC);
2345 return 0;
2346}
2347
Ezequiel Garcia87819152012-09-12 11:47:57 -03002348static __init int event_trace_enable(void)
2349{
Steven Rostedtae63b312012-05-03 23:09:03 -04002350 struct trace_array *tr = top_trace_array();
Ezequiel Garcia87819152012-09-12 11:47:57 -03002351 struct ftrace_event_call **iter, *call;
2352 char *buf = bootup_event_buf;
2353 char *token;
2354 int ret;
2355
2356 for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) {
2357
2358 call = *iter;
2359 ret = event_init(call);
2360 if (!ret)
2361 list_add(&call->list, &ftrace_events);
2362 }
2363
Steven Rostedt77248222013-02-27 16:28:06 -05002364 /*
2365 * We need the top trace array to have a working set of trace
2366 * points at early init, before the debug files and directories
2367 * are created. Create the file entries now, and attach them
2368 * to the actual file dentries later.
2369 */
2370 __trace_early_add_events(tr);
2371
Ezequiel Garcia87819152012-09-12 11:47:57 -03002372 while (true) {
2373 token = strsep(&buf, ",");
2374
2375 if (!token)
2376 break;
2377 if (!*token)
2378 continue;
2379
Steven Rostedtae63b312012-05-03 23:09:03 -04002380 ret = ftrace_set_clr_event(tr, token, 1);
Ezequiel Garcia87819152012-09-12 11:47:57 -03002381 if (ret)
2382 pr_warn("Failed to enable trace event: %s\n", token);
2383 }
Steven Rostedt81698832012-10-11 10:15:05 -04002384
2385 trace_printk_start_comm();
2386
Steven Rostedt (Red Hat)3cd715d2013-03-12 19:35:13 -04002387 register_event_cmds();
2388
Ezequiel Garcia87819152012-09-12 11:47:57 -03002389 return 0;
2390}
2391
Steven Rostedtb77e38a2009-02-24 10:21:36 -05002392static __init int event_trace_init(void)
2393{
Steven Rostedtae63b312012-05-03 23:09:03 -04002394 struct trace_array *tr;
Steven Rostedtb77e38a2009-02-24 10:21:36 -05002395 struct dentry *d_tracer;
2396 struct dentry *entry;
Steven Rostedt6d723732009-04-10 14:53:50 -04002397 int ret;
Steven Rostedtb77e38a2009-02-24 10:21:36 -05002398
Steven Rostedtae63b312012-05-03 23:09:03 -04002399 tr = top_trace_array();
2400
Steven Rostedtb77e38a2009-02-24 10:21:36 -05002401 d_tracer = tracing_init_dentry();
2402 if (!d_tracer)
2403 return 0;
2404
Steven Rostedt2314c4a2009-03-10 12:04:02 -04002405 entry = debugfs_create_file("available_events", 0444, d_tracer,
Steven Rostedtae63b312012-05-03 23:09:03 -04002406 tr, &ftrace_avail_fops);
Steven Rostedt2314c4a2009-03-10 12:04:02 -04002407 if (!entry)
2408 pr_warning("Could not create debugfs "
2409 "'available_events' entry\n");
2410
Li Zefan8728fe52010-05-24 16:22:49 +08002411 if (trace_define_common_fields())
2412 pr_warning("tracing: Failed to allocate common fields");
2413
Steven Rostedt77248222013-02-27 16:28:06 -05002414 ret = early_event_add_tracer(d_tracer, tr);
Steven Rostedtae63b312012-05-03 23:09:03 -04002415 if (ret)
2416 return ret;
Li Zefan020e5f82009-07-01 10:47:05 +08002417
Steven Rostedt6d723732009-04-10 14:53:50 -04002418 ret = register_module_notifier(&trace_module_nb);
Ming Lei55379372009-05-18 23:04:46 +08002419 if (ret)
Steven Rostedt6d723732009-04-10 14:53:50 -04002420 pr_warning("Failed to register trace events module notifier\n");
2421
Steven Rostedtb77e38a2009-02-24 10:21:36 -05002422 return 0;
2423}
Steven Rostedtd1a29142013-02-27 20:23:57 -05002424early_initcall(event_trace_memsetup);
Ezequiel Garcia87819152012-09-12 11:47:57 -03002425core_initcall(event_trace_enable);
Steven Rostedtb77e38a2009-02-24 10:21:36 -05002426fs_initcall(event_trace_init);
Steven Rostedte6187002009-04-15 13:36:40 -04002427
2428#ifdef CONFIG_FTRACE_STARTUP_TEST
2429
2430static DEFINE_SPINLOCK(test_spinlock);
2431static DEFINE_SPINLOCK(test_spinlock_irq);
2432static DEFINE_MUTEX(test_mutex);
2433
2434static __init void test_work(struct work_struct *dummy)
2435{
2436 spin_lock(&test_spinlock);
2437 spin_lock_irq(&test_spinlock_irq);
2438 udelay(1);
2439 spin_unlock_irq(&test_spinlock_irq);
2440 spin_unlock(&test_spinlock);
2441
2442 mutex_lock(&test_mutex);
2443 msleep(1);
2444 mutex_unlock(&test_mutex);
2445}
2446
2447static __init int event_test_thread(void *unused)
2448{
2449 void *test_malloc;
2450
2451 test_malloc = kmalloc(1234, GFP_KERNEL);
2452 if (!test_malloc)
2453 pr_info("failed to kmalloc\n");
2454
2455 schedule_on_each_cpu(test_work);
2456
2457 kfree(test_malloc);
2458
2459 set_current_state(TASK_INTERRUPTIBLE);
2460 while (!kthread_should_stop())
2461 schedule();
2462
2463 return 0;
2464}
2465
2466/*
2467 * Do various things that may trigger events.
2468 */
2469static __init void event_test_stuff(void)
2470{
2471 struct task_struct *test_thread;
2472
2473 test_thread = kthread_run(event_test_thread, NULL, "test-events");
2474 msleep(1);
2475 kthread_stop(test_thread);
2476}
2477
2478/*
2479 * For every trace event defined, we will test each trace point separately,
2480 * and then by groups, and finally all trace points.
2481 */
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002482static __init void event_trace_self_tests(void)
Steven Rostedte6187002009-04-15 13:36:40 -04002483{
Steven Rostedtae63b312012-05-03 23:09:03 -04002484 struct ftrace_subsystem_dir *dir;
2485 struct ftrace_event_file *file;
Steven Rostedte6187002009-04-15 13:36:40 -04002486 struct ftrace_event_call *call;
2487 struct event_subsystem *system;
Steven Rostedtae63b312012-05-03 23:09:03 -04002488 struct trace_array *tr;
Steven Rostedte6187002009-04-15 13:36:40 -04002489 int ret;
2490
Steven Rostedtae63b312012-05-03 23:09:03 -04002491 tr = top_trace_array();
2492
Steven Rostedte6187002009-04-15 13:36:40 -04002493 pr_info("Running tests on trace events:\n");
2494
Steven Rostedtae63b312012-05-03 23:09:03 -04002495 list_for_each_entry(file, &tr->events, list) {
2496
2497 call = file->event_call;
Steven Rostedte6187002009-04-15 13:36:40 -04002498
Steven Rostedt22392912010-04-21 12:27:06 -04002499 /* Only test those that have a probe */
2500 if (!call->class || !call->class->probe)
Steven Rostedte6187002009-04-15 13:36:40 -04002501 continue;
2502
Steven Rostedt1f5a6b42009-09-14 11:58:24 -04002503/*
2504 * Testing syscall events here is pretty useless, but
2505 * we still do it if configured. But this is time consuming.
2506 * What we really need is a user thread to perform the
2507 * syscalls as we test.
2508 */
2509#ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS
Steven Rostedt8f082012010-04-20 10:47:33 -04002510 if (call->class->system &&
2511 strcmp(call->class->system, "syscalls") == 0)
Steven Rostedt1f5a6b42009-09-14 11:58:24 -04002512 continue;
2513#endif
2514
Steven Rostedte6187002009-04-15 13:36:40 -04002515 pr_info("Testing event %s: ", call->name);
2516
2517 /*
2518 * If an event is already enabled, someone is using
2519 * it and the self test should not be on.
2520 */
Steven Rostedtae63b312012-05-03 23:09:03 -04002521 if (file->flags & FTRACE_EVENT_FL_ENABLED) {
Steven Rostedte6187002009-04-15 13:36:40 -04002522 pr_warning("Enabled event during self test!\n");
2523 WARN_ON_ONCE(1);
2524 continue;
2525 }
2526
Steven Rostedtae63b312012-05-03 23:09:03 -04002527 ftrace_event_enable_disable(file, 1);
Steven Rostedte6187002009-04-15 13:36:40 -04002528 event_test_stuff();
Steven Rostedtae63b312012-05-03 23:09:03 -04002529 ftrace_event_enable_disable(file, 0);
Steven Rostedte6187002009-04-15 13:36:40 -04002530
2531 pr_cont("OK\n");
2532 }
2533
2534 /* Now test at the sub system level */
2535
2536 pr_info("Running tests on trace event systems:\n");
2537
Steven Rostedtae63b312012-05-03 23:09:03 -04002538 list_for_each_entry(dir, &tr->systems, list) {
2539
2540 system = dir->subsystem;
Steven Rostedte6187002009-04-15 13:36:40 -04002541
2542 /* the ftrace system is special, skip it */
2543 if (strcmp(system->name, "ftrace") == 0)
2544 continue;
2545
2546 pr_info("Testing event system %s: ", system->name);
2547
Steven Rostedtae63b312012-05-03 23:09:03 -04002548 ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1);
Steven Rostedte6187002009-04-15 13:36:40 -04002549 if (WARN_ON_ONCE(ret)) {
2550 pr_warning("error enabling system %s\n",
2551 system->name);
2552 continue;
2553 }
2554
2555 event_test_stuff();
2556
Steven Rostedtae63b312012-05-03 23:09:03 -04002557 ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0);
Yuanhan Liu76bab1b2012-08-27 15:13:45 +08002558 if (WARN_ON_ONCE(ret)) {
Steven Rostedte6187002009-04-15 13:36:40 -04002559 pr_warning("error disabling system %s\n",
2560 system->name);
Yuanhan Liu76bab1b2012-08-27 15:13:45 +08002561 continue;
2562 }
Steven Rostedte6187002009-04-15 13:36:40 -04002563
2564 pr_cont("OK\n");
2565 }
2566
2567 /* Test with all events enabled */
2568
2569 pr_info("Running tests on all trace events:\n");
2570 pr_info("Testing all events: ");
2571
Steven Rostedtae63b312012-05-03 23:09:03 -04002572 ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1);
Steven Rostedte6187002009-04-15 13:36:40 -04002573 if (WARN_ON_ONCE(ret)) {
Steven Rostedte6187002009-04-15 13:36:40 -04002574 pr_warning("error enabling all events\n");
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002575 return;
Steven Rostedte6187002009-04-15 13:36:40 -04002576 }
2577
2578 event_test_stuff();
2579
2580 /* reset sysname */
Steven Rostedtae63b312012-05-03 23:09:03 -04002581 ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0);
Steven Rostedte6187002009-04-15 13:36:40 -04002582 if (WARN_ON_ONCE(ret)) {
2583 pr_warning("error disabling all events\n");
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002584 return;
Steven Rostedte6187002009-04-15 13:36:40 -04002585 }
2586
2587 pr_cont("OK\n");
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002588}
2589
2590#ifdef CONFIG_FUNCTION_TRACER
2591
Tejun Heo245b2e72009-06-24 15:13:48 +09002592static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable);
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002593
2594static void
Steven Rostedt2f5f6ad2011-08-08 16:57:47 -04002595function_test_events_call(unsigned long ip, unsigned long parent_ip,
Steven Rostedta1e2e312011-08-09 12:50:46 -04002596 struct ftrace_ops *op, struct pt_regs *pt_regs)
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002597{
2598 struct ring_buffer_event *event;
Steven Rostedte77405a2009-09-02 14:17:06 -04002599 struct ring_buffer *buffer;
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002600 struct ftrace_entry *entry;
2601 unsigned long flags;
2602 long disabled;
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002603 int cpu;
2604 int pc;
2605
2606 pc = preempt_count();
Steven Rostedt5168ae52010-06-03 09:36:50 -04002607 preempt_disable_notrace();
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002608 cpu = raw_smp_processor_id();
Tejun Heo245b2e72009-06-24 15:13:48 +09002609 disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu));
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002610
2611 if (disabled != 1)
2612 goto out;
2613
2614 local_save_flags(flags);
2615
Steven Rostedte77405a2009-09-02 14:17:06 -04002616 event = trace_current_buffer_lock_reserve(&buffer,
2617 TRACE_FN, sizeof(*entry),
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002618 flags, pc);
2619 if (!event)
2620 goto out;
2621 entry = ring_buffer_event_data(event);
2622 entry->ip = ip;
2623 entry->parent_ip = parent_ip;
2624
Steven Rostedt0d5c6e12012-11-01 20:54:21 -04002625 trace_buffer_unlock_commit(buffer, event, flags, pc);
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002626
2627 out:
Tejun Heo245b2e72009-06-24 15:13:48 +09002628 atomic_dec(&per_cpu(ftrace_test_event_disable, cpu));
Steven Rostedt5168ae52010-06-03 09:36:50 -04002629 preempt_enable_notrace();
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002630}
2631
2632static struct ftrace_ops trace_ops __initdata =
2633{
2634 .func = function_test_events_call,
Steven Rostedt47409742012-07-20 11:04:44 -04002635 .flags = FTRACE_OPS_FL_RECURSION_SAFE,
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002636};
2637
2638static __init void event_trace_self_test_with_function(void)
2639{
Steven Rostedt17bb6152011-05-23 15:27:46 -04002640 int ret;
2641 ret = register_ftrace_function(&trace_ops);
2642 if (WARN_ON(ret < 0)) {
2643 pr_info("Failed to enable function tracer for event tests\n");
2644 return;
2645 }
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002646 pr_info("Running tests again, along with the function tracer\n");
2647 event_trace_self_tests();
2648 unregister_ftrace_function(&trace_ops);
2649}
2650#else
2651static __init void event_trace_self_test_with_function(void)
2652{
2653}
2654#endif
2655
2656static __init int event_trace_self_tests_init(void)
2657{
Li Zefan020e5f82009-07-01 10:47:05 +08002658 if (!tracing_selftest_disabled) {
2659 event_trace_self_tests();
2660 event_trace_self_test_with_function();
2661 }
Steven Rostedte6187002009-04-15 13:36:40 -04002662
2663 return 0;
2664}
2665
Steven Rostedt28d20e22009-04-20 12:12:44 -04002666late_initcall(event_trace_self_tests_init);
Steven Rostedte6187002009-04-15 13:36:40 -04002667
2668#endif