blob: 29111da1d1006c1f7b57a939b54517d17f315520 [file] [log] [blame]
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);
Li Zefan8728fe52010-05-24 16:22:49 +080037LIST_HEAD(ftrace_common_fields);
Steven Rostedta59fd602009-04-10 13:52:20 -040038
Steven Rostedt2e33af02010-04-22 10:35:55 -040039struct list_head *
40trace_get_fields(struct ftrace_event_call *event_call)
41{
42 if (!event_call->class->get_fields)
43 return &event_call->class->fields;
44 return event_call->class->get_fields(event_call);
45}
46
Li Zefan8728fe52010-05-24 16:22:49 +080047static int __trace_define_field(struct list_head *head, const char *type,
48 const char *name, int offset, int size,
49 int is_signed, int filter_type)
Tom Zanussicf027f62009-03-22 03:30:39 -050050{
51 struct ftrace_event_field *field;
52
Ingo Molnarfe9f57f2009-03-22 18:41:59 +010053 field = kzalloc(sizeof(*field), GFP_KERNEL);
Tom Zanussicf027f62009-03-22 03:30:39 -050054 if (!field)
55 goto err;
Ingo Molnarfe9f57f2009-03-22 18:41:59 +010056
Tom Zanussicf027f62009-03-22 03:30:39 -050057 field->name = kstrdup(name, GFP_KERNEL);
58 if (!field->name)
59 goto err;
Ingo Molnarfe9f57f2009-03-22 18:41:59 +010060
Tom Zanussicf027f62009-03-22 03:30:39 -050061 field->type = kstrdup(type, GFP_KERNEL);
62 if (!field->type)
63 goto err;
Ingo Molnarfe9f57f2009-03-22 18:41:59 +010064
Li Zefan43b51ea2009-08-07 10:33:22 +080065 if (filter_type == FILTER_OTHER)
66 field->filter_type = filter_assign_type(type);
67 else
68 field->filter_type = filter_type;
69
Tom Zanussicf027f62009-03-22 03:30:39 -050070 field->offset = offset;
71 field->size = size;
Tom Zanussia118e4d2009-04-28 03:04:53 -050072 field->is_signed = is_signed;
Li Zefanaa38e9f2009-08-07 10:33:02 +080073
Steven Rostedt2e33af02010-04-22 10:35:55 -040074 list_add(&field->link, head);
Tom Zanussicf027f62009-03-22 03:30:39 -050075
76 return 0;
Ingo Molnarfe9f57f2009-03-22 18:41:59 +010077
Tom Zanussicf027f62009-03-22 03:30:39 -050078err:
Wenji Huang7b609972010-02-24 15:40:26 +080079 if (field)
Tom Zanussicf027f62009-03-22 03:30:39 -050080 kfree(field->name);
Tom Zanussicf027f62009-03-22 03:30:39 -050081 kfree(field);
Ingo Molnarfe9f57f2009-03-22 18:41:59 +010082
Tom Zanussicf027f62009-03-22 03:30:39 -050083 return -ENOMEM;
84}
Li Zefan8728fe52010-05-24 16:22:49 +080085
86int trace_define_field(struct ftrace_event_call *call, const char *type,
87 const char *name, int offset, int size, int is_signed,
88 int filter_type)
89{
90 struct list_head *head;
91
92 if (WARN_ON(!call->class))
93 return 0;
94
95 head = trace_get_fields(call);
96 return __trace_define_field(head, type, name, offset, size,
97 is_signed, filter_type);
98}
Steven Rostedt17c873e2009-04-10 18:12:50 -040099EXPORT_SYMBOL_GPL(trace_define_field);
Tom Zanussicf027f62009-03-22 03:30:39 -0500100
Li Zefane647d6b2009-08-19 15:54:32 +0800101#define __common_field(type, item) \
Li Zefan8728fe52010-05-24 16:22:49 +0800102 ret = __trace_define_field(&ftrace_common_fields, #type, \
103 "common_" #item, \
104 offsetof(typeof(ent), item), \
105 sizeof(ent.item), \
106 is_signed_type(type), FILTER_OTHER); \
Li Zefane647d6b2009-08-19 15:54:32 +0800107 if (ret) \
108 return ret;
109
Li Zefan8728fe52010-05-24 16:22:49 +0800110static int trace_define_common_fields(void)
Li Zefane647d6b2009-08-19 15:54:32 +0800111{
112 int ret;
113 struct trace_entry ent;
114
115 __common_field(unsigned short, type);
116 __common_field(unsigned char, flags);
117 __common_field(unsigned char, preempt_count);
118 __common_field(int, pid);
Arjan van de Vena3a4a5a2011-05-05 23:55:18 -0400119 __common_field(int, padding);
Li Zefane647d6b2009-08-19 15:54:32 +0800120
121 return ret;
122}
123
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -0400124void trace_destroy_fields(struct ftrace_event_call *call)
Li Zefan2df75e42009-05-06 10:33:04 +0800125{
126 struct ftrace_event_field *field, *next;
Steven Rostedt2e33af02010-04-22 10:35:55 -0400127 struct list_head *head;
Li Zefan2df75e42009-05-06 10:33:04 +0800128
Steven Rostedt2e33af02010-04-22 10:35:55 -0400129 head = trace_get_fields(call);
130 list_for_each_entry_safe(field, next, head, link) {
Li Zefan2df75e42009-05-06 10:33:04 +0800131 list_del(&field->link);
132 kfree(field->type);
133 kfree(field->name);
134 kfree(field);
135 }
136}
137
Li Zefan87d9b4e2009-12-08 11:14:20 +0800138int trace_event_raw_init(struct ftrace_event_call *call)
139{
140 int id;
141
Steven Rostedt80decc72010-04-23 10:00:22 -0400142 id = register_ftrace_event(&call->event);
Li Zefan87d9b4e2009-12-08 11:14:20 +0800143 if (!id)
144 return -ENODEV;
Li Zefan87d9b4e2009-12-08 11:14:20 +0800145
146 return 0;
147}
148EXPORT_SYMBOL_GPL(trace_event_raw_init);
149
Jiri Olsaceec0b62012-02-15 15:51:49 +0100150int ftrace_event_reg(struct ftrace_event_call *call,
151 enum trace_reg type, void *data)
Steven Rostedta1d0ce82010-06-08 11:22:06 -0400152{
153 switch (type) {
154 case TRACE_REG_REGISTER:
155 return tracepoint_probe_register(call->name,
156 call->class->probe,
157 call);
158 case TRACE_REG_UNREGISTER:
159 tracepoint_probe_unregister(call->name,
160 call->class->probe,
161 call);
162 return 0;
163
164#ifdef CONFIG_PERF_EVENTS
165 case TRACE_REG_PERF_REGISTER:
166 return tracepoint_probe_register(call->name,
167 call->class->perf_probe,
168 call);
169 case TRACE_REG_PERF_UNREGISTER:
170 tracepoint_probe_unregister(call->name,
171 call->class->perf_probe,
172 call);
173 return 0;
Jiri Olsaceec0b62012-02-15 15:51:49 +0100174 case TRACE_REG_PERF_OPEN:
175 case TRACE_REG_PERF_CLOSE:
Jiri Olsa489c75c2012-02-15 15:51:50 +0100176 case TRACE_REG_PERF_ADD:
177 case TRACE_REG_PERF_DEL:
Jiri Olsaceec0b62012-02-15 15:51:49 +0100178 return 0;
Steven Rostedta1d0ce82010-06-08 11:22:06 -0400179#endif
180 }
181 return 0;
182}
183EXPORT_SYMBOL_GPL(ftrace_event_reg);
184
Li Zefane870e9a2010-07-02 11:07:32 +0800185void trace_event_enable_cmd_record(bool enable)
186{
187 struct ftrace_event_call *call;
188
189 mutex_lock(&event_mutex);
190 list_for_each_entry(call, &ftrace_events, list) {
191 if (!(call->flags & TRACE_EVENT_FL_ENABLED))
192 continue;
193
194 if (enable) {
195 tracing_start_cmdline_record();
196 call->flags |= TRACE_EVENT_FL_RECORDED_CMD;
197 } else {
198 tracing_stop_cmdline_record();
199 call->flags &= ~TRACE_EVENT_FL_RECORDED_CMD;
200 }
201 }
202 mutex_unlock(&event_mutex);
203}
204
Li Zefan3b8e4272009-12-08 11:14:52 +0800205static int ftrace_event_enable_disable(struct ftrace_event_call *call,
Steven Rostedtfd994982009-02-28 02:41:25 -0500206 int enable)
207{
Li Zefan3b8e4272009-12-08 11:14:52 +0800208 int ret = 0;
209
Steven Rostedtfd994982009-02-28 02:41:25 -0500210 switch (enable) {
211 case 0:
Steven Rostedt553552c2010-04-23 11:12:36 -0400212 if (call->flags & TRACE_EVENT_FL_ENABLED) {
213 call->flags &= ~TRACE_EVENT_FL_ENABLED;
Li Zefane870e9a2010-07-02 11:07:32 +0800214 if (call->flags & TRACE_EVENT_FL_RECORDED_CMD) {
215 tracing_stop_cmdline_record();
216 call->flags &= ~TRACE_EVENT_FL_RECORDED_CMD;
217 }
Jiri Olsaceec0b62012-02-15 15:51:49 +0100218 call->class->reg(call, TRACE_REG_UNREGISTER, NULL);
Steven Rostedtfd994982009-02-28 02:41:25 -0500219 }
Steven Rostedtfd994982009-02-28 02:41:25 -0500220 break;
221 case 1:
Steven Rostedt553552c2010-04-23 11:12:36 -0400222 if (!(call->flags & TRACE_EVENT_FL_ENABLED)) {
Li Zefane870e9a2010-07-02 11:07:32 +0800223 if (trace_flags & TRACE_ITER_RECORD_CMD) {
224 tracing_start_cmdline_record();
225 call->flags |= TRACE_EVENT_FL_RECORDED_CMD;
226 }
Jiri Olsaceec0b62012-02-15 15:51:49 +0100227 ret = call->class->reg(call, TRACE_REG_REGISTER, NULL);
Li Zefan3b8e4272009-12-08 11:14:52 +0800228 if (ret) {
229 tracing_stop_cmdline_record();
230 pr_info("event trace: Could not enable event "
231 "%s\n", call->name);
232 break;
233 }
Steven Rostedt553552c2010-04-23 11:12:36 -0400234 call->flags |= TRACE_EVENT_FL_ENABLED;
Steven Rostedtfd994982009-02-28 02:41:25 -0500235 }
Steven Rostedtfd994982009-02-28 02:41:25 -0500236 break;
237 }
Li Zefan3b8e4272009-12-08 11:14:52 +0800238
239 return ret;
Steven Rostedtfd994982009-02-28 02:41:25 -0500240}
241
Zhaolei0e907c92009-05-25 18:13:59 +0800242static void ftrace_clear_events(void)
243{
244 struct ftrace_event_call *call;
245
246 mutex_lock(&event_mutex);
247 list_for_each_entry(call, &ftrace_events, list) {
248 ftrace_event_enable_disable(call, 0);
249 }
250 mutex_unlock(&event_mutex);
251}
252
Steven Rostedte9dbfae2011-07-05 11:36:06 -0400253static void __put_system(struct event_subsystem *system)
254{
255 struct event_filter *filter = system->filter;
256
257 WARN_ON_ONCE(system->ref_count == 0);
258 if (--system->ref_count)
259 return;
260
261 if (filter) {
262 kfree(filter->filter_string);
263 kfree(filter);
264 }
265 kfree(system->name);
266 kfree(system);
267}
268
269static void __get_system(struct event_subsystem *system)
270{
271 WARN_ON_ONCE(system->ref_count == 0);
272 system->ref_count++;
273}
274
275static void put_system(struct event_subsystem *system)
276{
277 mutex_lock(&event_mutex);
278 __put_system(system);
279 mutex_unlock(&event_mutex);
280}
281
Li Zefan8f31bfe2009-05-08 10:31:42 +0800282/*
283 * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events.
284 */
285static int __ftrace_set_clr_event(const char *match, const char *sub,
286 const char *event, int set)
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500287{
Steven Rostedta59fd602009-04-10 13:52:20 -0400288 struct ftrace_event_call *call;
Steven Rostedt29f93942009-05-08 16:06:47 -0400289 int ret = -EINVAL;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500290
Steven Rostedt11a241a2009-03-02 11:49:04 -0500291 mutex_lock(&event_mutex);
Steven Rostedta59fd602009-04-10 13:52:20 -0400292 list_for_each_entry(call, &ftrace_events, list) {
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500293
Steven Rostedta1d0ce82010-06-08 11:22:06 -0400294 if (!call->name || !call->class || !call->class->reg)
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500295 continue;
Steven Rostedt1473e442009-02-24 14:15:08 -0500296
Steven Rostedt9b637762012-05-10 15:55:43 -0400297 if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)
298 continue;
299
Steven Rostedtb628b3e2009-02-27 23:32:58 -0500300 if (match &&
301 strcmp(match, call->name) != 0 &&
Steven Rostedt8f082012010-04-20 10:47:33 -0400302 strcmp(match, call->class->system) != 0)
Steven Rostedtb628b3e2009-02-27 23:32:58 -0500303 continue;
304
Steven Rostedt8f082012010-04-20 10:47:33 -0400305 if (sub && strcmp(sub, call->class->system) != 0)
Steven Rostedtb628b3e2009-02-27 23:32:58 -0500306 continue;
307
308 if (event && strcmp(event, call->name) != 0)
Steven Rostedt1473e442009-02-24 14:15:08 -0500309 continue;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500310
Steven Rostedtfd994982009-02-28 02:41:25 -0500311 ftrace_event_enable_disable(call, set);
312
Steven Rostedtb628b3e2009-02-27 23:32:58 -0500313 ret = 0;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500314 }
Steven Rostedt11a241a2009-03-02 11:49:04 -0500315 mutex_unlock(&event_mutex);
316
Steven Rostedtb628b3e2009-02-27 23:32:58 -0500317 return ret;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500318}
319
Li Zefan8f31bfe2009-05-08 10:31:42 +0800320static int ftrace_set_clr_event(char *buf, int set)
321{
322 char *event = NULL, *sub = NULL, *match;
323
324 /*
325 * The buf format can be <subsystem>:<event-name>
326 * *:<event-name> means any event by that name.
327 * :<event-name> is the same.
328 *
329 * <subsystem>:* means all events in that subsystem
330 * <subsystem>: means the same.
331 *
332 * <name> (no ':') means all events in a subsystem with
333 * the name <name> or any event that matches <name>
334 */
335
336 match = strsep(&buf, ":");
337 if (buf) {
338 sub = match;
339 event = buf;
340 match = NULL;
341
342 if (!strlen(sub) || strcmp(sub, "*") == 0)
343 sub = NULL;
344 if (!strlen(event) || strcmp(event, "*") == 0)
345 event = NULL;
346 }
347
348 return __ftrace_set_clr_event(match, sub, event, set);
349}
350
Steven Rostedt4671c792009-05-08 16:27:41 -0400351/**
352 * trace_set_clr_event - enable or disable an event
353 * @system: system name to match (NULL for any system)
354 * @event: event name to match (NULL for all events, within system)
355 * @set: 1 to enable, 0 to disable
356 *
357 * This is a way for other parts of the kernel to enable or disable
358 * event recording.
359 *
360 * Returns 0 on success, -EINVAL if the parameters do not match any
361 * registered events.
362 */
363int trace_set_clr_event(const char *system, const char *event, int set)
364{
365 return __ftrace_set_clr_event(NULL, system, event, set);
366}
Yuanhan Liu56355b82010-11-08 14:05:12 +0800367EXPORT_SYMBOL_GPL(trace_set_clr_event);
Steven Rostedt4671c792009-05-08 16:27:41 -0400368
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500369/* 128 should be much more than enough */
370#define EVENT_BUF_SIZE 127
371
372static ssize_t
373ftrace_event_write(struct file *file, const char __user *ubuf,
374 size_t cnt, loff_t *ppos)
375{
jolsa@redhat.com48966362009-09-11 17:29:28 +0200376 struct trace_parser parser;
Li Zefan4ba79782009-09-22 13:52:20 +0800377 ssize_t read, ret;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500378
Li Zefan4ba79782009-09-22 13:52:20 +0800379 if (!cnt)
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500380 return 0;
381
Steven Rostedt1852fcc2009-03-11 14:33:00 -0400382 ret = tracing_update_buffers();
383 if (ret < 0)
384 return ret;
385
jolsa@redhat.com48966362009-09-11 17:29:28 +0200386 if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1))
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500387 return -ENOMEM;
388
jolsa@redhat.com48966362009-09-11 17:29:28 +0200389 read = trace_get_user(&parser, ubuf, cnt, ppos);
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500390
Li Zefan4ba79782009-09-22 13:52:20 +0800391 if (read >= 0 && trace_parser_loaded((&parser))) {
jolsa@redhat.com48966362009-09-11 17:29:28 +0200392 int set = 1;
393
394 if (*parser.buffer == '!')
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500395 set = 0;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500396
jolsa@redhat.com48966362009-09-11 17:29:28 +0200397 parser.buffer[parser.idx] = 0;
398
399 ret = ftrace_set_clr_event(parser.buffer + !set, set);
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500400 if (ret)
jolsa@redhat.com48966362009-09-11 17:29:28 +0200401 goto out_put;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500402 }
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500403
404 ret = read;
405
jolsa@redhat.com48966362009-09-11 17:29:28 +0200406 out_put:
407 trace_parser_put(&parser);
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500408
409 return ret;
410}
411
412static void *
413t_next(struct seq_file *m, void *v, loff_t *pos)
414{
Li Zefan30bd39c2009-09-18 14:07:05 +0800415 struct ftrace_event_call *call = v;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500416
417 (*pos)++;
418
Li Zefan30bd39c2009-09-18 14:07:05 +0800419 list_for_each_entry_continue(call, &ftrace_events, list) {
Steven Rostedt40e26812009-03-10 11:32:40 -0400420 /*
421 * The ftrace subsystem is for showing formats only.
422 * They can not be enabled or disabled via the event files.
423 */
Steven Rostedta1d0ce82010-06-08 11:22:06 -0400424 if (call->class && call->class->reg)
Li Zefan30bd39c2009-09-18 14:07:05 +0800425 return call;
Steven Rostedt40e26812009-03-10 11:32:40 -0400426 }
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500427
Li Zefan30bd39c2009-09-18 14:07:05 +0800428 return NULL;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500429}
430
431static void *t_start(struct seq_file *m, loff_t *pos)
432{
Li Zefan30bd39c2009-09-18 14:07:05 +0800433 struct ftrace_event_call *call;
Li Zefane1c7e2a2009-06-24 09:52:29 +0800434 loff_t l;
435
Li Zefan20c89282009-05-06 10:33:45 +0800436 mutex_lock(&event_mutex);
Li Zefane1c7e2a2009-06-24 09:52:29 +0800437
Li Zefan30bd39c2009-09-18 14:07:05 +0800438 call = list_entry(&ftrace_events, struct ftrace_event_call, list);
Li Zefane1c7e2a2009-06-24 09:52:29 +0800439 for (l = 0; l <= *pos; ) {
Li Zefan30bd39c2009-09-18 14:07:05 +0800440 call = t_next(m, call, &l);
Li Zefane1c7e2a2009-06-24 09:52:29 +0800441 if (!call)
442 break;
443 }
444 return call;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500445}
446
447static void *
448s_next(struct seq_file *m, void *v, loff_t *pos)
449{
Li Zefan30bd39c2009-09-18 14:07:05 +0800450 struct ftrace_event_call *call = v;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500451
452 (*pos)++;
453
Li Zefan30bd39c2009-09-18 14:07:05 +0800454 list_for_each_entry_continue(call, &ftrace_events, list) {
Steven Rostedt553552c2010-04-23 11:12:36 -0400455 if (call->flags & TRACE_EVENT_FL_ENABLED)
Li Zefan30bd39c2009-09-18 14:07:05 +0800456 return call;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500457 }
458
Li Zefan30bd39c2009-09-18 14:07:05 +0800459 return NULL;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500460}
461
462static void *s_start(struct seq_file *m, loff_t *pos)
463{
Li Zefan30bd39c2009-09-18 14:07:05 +0800464 struct ftrace_event_call *call;
Li Zefane1c7e2a2009-06-24 09:52:29 +0800465 loff_t l;
466
Li Zefan20c89282009-05-06 10:33:45 +0800467 mutex_lock(&event_mutex);
Li Zefane1c7e2a2009-06-24 09:52:29 +0800468
Li Zefan30bd39c2009-09-18 14:07:05 +0800469 call = list_entry(&ftrace_events, struct ftrace_event_call, list);
Li Zefane1c7e2a2009-06-24 09:52:29 +0800470 for (l = 0; l <= *pos; ) {
Li Zefan30bd39c2009-09-18 14:07:05 +0800471 call = s_next(m, call, &l);
Li Zefane1c7e2a2009-06-24 09:52:29 +0800472 if (!call)
473 break;
474 }
475 return call;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500476}
477
478static int t_show(struct seq_file *m, void *v)
479{
480 struct ftrace_event_call *call = v;
481
Steven Rostedt8f082012010-04-20 10:47:33 -0400482 if (strcmp(call->class->system, TRACE_SYSTEM) != 0)
483 seq_printf(m, "%s:", call->class->system);
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500484 seq_printf(m, "%s\n", call->name);
485
486 return 0;
487}
488
489static void t_stop(struct seq_file *m, void *p)
490{
Li Zefan20c89282009-05-06 10:33:45 +0800491 mutex_unlock(&event_mutex);
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500492}
493
494static int
495ftrace_event_seq_open(struct inode *inode, struct file *file)
496{
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500497 const struct seq_operations *seq_ops;
498
499 if ((file->f_mode & FMODE_WRITE) &&
Steven Rostedt8650ae32009-07-22 23:29:30 -0400500 (file->f_flags & O_TRUNC))
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500501 ftrace_clear_events();
502
503 seq_ops = inode->i_private;
Li Zefan20c89282009-05-06 10:33:45 +0800504 return seq_open(file, seq_ops);
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500505}
506
Steven Rostedt1473e442009-02-24 14:15:08 -0500507static ssize_t
508event_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
509 loff_t *ppos)
510{
511 struct ftrace_event_call *call = filp->private_data;
512 char *buf;
513
Steven Rostedt553552c2010-04-23 11:12:36 -0400514 if (call->flags & TRACE_EVENT_FL_ENABLED)
Steven Rostedt1473e442009-02-24 14:15:08 -0500515 buf = "1\n";
516 else
517 buf = "0\n";
518
519 return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2);
520}
521
522static ssize_t
523event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
524 loff_t *ppos)
525{
526 struct ftrace_event_call *call = filp->private_data;
Steven Rostedt1473e442009-02-24 14:15:08 -0500527 unsigned long val;
528 int ret;
529
Peter Huewe22fe9b52011-06-07 21:58:27 +0200530 ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
531 if (ret)
Steven Rostedt1473e442009-02-24 14:15:08 -0500532 return ret;
533
Steven Rostedt1852fcc2009-03-11 14:33:00 -0400534 ret = tracing_update_buffers();
535 if (ret < 0)
536 return ret;
537
Steven Rostedt1473e442009-02-24 14:15:08 -0500538 switch (val) {
539 case 0:
Steven Rostedt1473e442009-02-24 14:15:08 -0500540 case 1:
Steven Rostedt11a241a2009-03-02 11:49:04 -0500541 mutex_lock(&event_mutex);
Li Zefan3b8e4272009-12-08 11:14:52 +0800542 ret = ftrace_event_enable_disable(call, val);
Steven Rostedt11a241a2009-03-02 11:49:04 -0500543 mutex_unlock(&event_mutex);
Steven Rostedt1473e442009-02-24 14:15:08 -0500544 break;
545
546 default:
547 return -EINVAL;
548 }
549
550 *ppos += cnt;
551
Li Zefan3b8e4272009-12-08 11:14:52 +0800552 return ret ? ret : cnt;
Steven Rostedt1473e442009-02-24 14:15:08 -0500553}
554
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400555static ssize_t
556system_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
557 loff_t *ppos)
558{
Li Zefanc142b152009-05-08 10:32:05 +0800559 const char set_to_char[4] = { '?', '0', '1', 'X' };
Steven Rostedt40ee4df2011-07-05 14:32:51 -0400560 struct event_subsystem *system = filp->private_data;
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400561 struct ftrace_event_call *call;
562 char buf[2];
Li Zefanc142b152009-05-08 10:32:05 +0800563 int set = 0;
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400564 int ret;
565
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400566 mutex_lock(&event_mutex);
567 list_for_each_entry(call, &ftrace_events, list) {
Steven Rostedta1d0ce82010-06-08 11:22:06 -0400568 if (!call->name || !call->class || !call->class->reg)
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400569 continue;
570
Steven Rostedt40ee4df2011-07-05 14:32:51 -0400571 if (system && strcmp(call->class->system, system->name) != 0)
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400572 continue;
573
574 /*
575 * We need to find out if all the events are set
576 * or if all events or cleared, or if we have
577 * a mixture.
578 */
Steven Rostedt553552c2010-04-23 11:12:36 -0400579 set |= (1 << !!(call->flags & TRACE_EVENT_FL_ENABLED));
Li Zefanc142b152009-05-08 10:32:05 +0800580
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400581 /*
582 * If we have a mixture, no need to look further.
583 */
Li Zefanc142b152009-05-08 10:32:05 +0800584 if (set == 3)
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400585 break;
586 }
587 mutex_unlock(&event_mutex);
588
Li Zefanc142b152009-05-08 10:32:05 +0800589 buf[0] = set_to_char[set];
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400590 buf[1] = '\n';
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400591
592 ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2);
593
594 return ret;
595}
596
597static ssize_t
598system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
599 loff_t *ppos)
600{
Steven Rostedt40ee4df2011-07-05 14:32:51 -0400601 struct event_subsystem *system = filp->private_data;
602 const char *name = NULL;
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400603 unsigned long val;
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400604 ssize_t ret;
605
Peter Huewe22fe9b52011-06-07 21:58:27 +0200606 ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
607 if (ret)
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400608 return ret;
609
610 ret = tracing_update_buffers();
611 if (ret < 0)
612 return ret;
613
Li Zefan8f31bfe2009-05-08 10:31:42 +0800614 if (val != 0 && val != 1)
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400615 return -EINVAL;
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400616
Steven Rostedt40ee4df2011-07-05 14:32:51 -0400617 /*
618 * Opening of "enable" adds a ref count to system,
619 * so the name is safe to use.
620 */
621 if (system)
622 name = system->name;
623
624 ret = __ftrace_set_clr_event(NULL, name, NULL, val);
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400625 if (ret)
Li Zefan8f31bfe2009-05-08 10:31:42 +0800626 goto out;
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400627
628 ret = cnt;
629
Li Zefan8f31bfe2009-05-08 10:31:42 +0800630out:
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400631 *ppos += cnt;
632
633 return ret;
634}
635
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400636enum {
637 FORMAT_HEADER = 1,
Li Zefan86397dc2010-08-17 13:53:06 +0800638 FORMAT_FIELD_SEPERATOR = 2,
639 FORMAT_PRINTFMT = 3,
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400640};
641
642static void *f_next(struct seq_file *m, void *v, loff_t *pos)
Steven Rostedt981d0812009-03-02 13:53:59 -0500643{
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400644 struct ftrace_event_call *call = m->private;
Lai Jiangshan5a65e952009-12-15 15:39:53 +0800645 struct ftrace_event_field *field;
Li Zefan86397dc2010-08-17 13:53:06 +0800646 struct list_head *common_head = &ftrace_common_fields;
647 struct list_head *head = trace_get_fields(call);
Steven Rostedt981d0812009-03-02 13:53:59 -0500648
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400649 (*pos)++;
Lai Jiangshan5a65e952009-12-15 15:39:53 +0800650
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400651 switch ((unsigned long)v) {
652 case FORMAT_HEADER:
Li Zefan86397dc2010-08-17 13:53:06 +0800653 if (unlikely(list_empty(common_head)))
654 return NULL;
Lai Jiangshan5a65e952009-12-15 15:39:53 +0800655
Li Zefan86397dc2010-08-17 13:53:06 +0800656 field = list_entry(common_head->prev,
657 struct ftrace_event_field, link);
658 return field;
659
660 case FORMAT_FIELD_SEPERATOR:
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400661 if (unlikely(list_empty(head)))
662 return NULL;
Lai Jiangshan5a65e952009-12-15 15:39:53 +0800663
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400664 field = list_entry(head->prev, struct ftrace_event_field, link);
665 return field;
Lai Jiangshan5a65e952009-12-15 15:39:53 +0800666
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400667 case FORMAT_PRINTFMT:
668 /* all done */
669 return NULL;
Lai Jiangshan5a65e952009-12-15 15:39:53 +0800670 }
671
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400672 field = v;
Li Zefan86397dc2010-08-17 13:53:06 +0800673 if (field->link.prev == common_head)
674 return (void *)FORMAT_FIELD_SEPERATOR;
675 else if (field->link.prev == head)
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400676 return (void *)FORMAT_PRINTFMT;
677
678 field = list_entry(field->link.prev, struct ftrace_event_field, link);
679
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400680 return field;
Li Zefan8728fe52010-05-24 16:22:49 +0800681}
Lai Jiangshan5a65e952009-12-15 15:39:53 +0800682
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400683static void *f_start(struct seq_file *m, loff_t *pos)
Li Zefan8728fe52010-05-24 16:22:49 +0800684{
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400685 loff_t l = 0;
686 void *p;
Li Zefan8728fe52010-05-24 16:22:49 +0800687
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400688 /* Start by showing the header */
689 if (!*pos)
690 return (void *)FORMAT_HEADER;
691
692 p = (void *)FORMAT_HEADER;
693 do {
694 p = f_next(m, p, &l);
695 } while (p && l < *pos);
696
697 return p;
698}
699
700static int f_show(struct seq_file *m, void *v)
701{
702 struct ftrace_event_call *call = m->private;
703 struct ftrace_event_field *field;
704 const char *array_descriptor;
705
706 switch ((unsigned long)v) {
707 case FORMAT_HEADER:
708 seq_printf(m, "name: %s\n", call->name);
709 seq_printf(m, "ID: %d\n", call->event.type);
710 seq_printf(m, "format:\n");
Li Zefan8728fe52010-05-24 16:22:49 +0800711 return 0;
712
Li Zefan86397dc2010-08-17 13:53:06 +0800713 case FORMAT_FIELD_SEPERATOR:
714 seq_putc(m, '\n');
715 return 0;
716
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400717 case FORMAT_PRINTFMT:
718 seq_printf(m, "\nprint fmt: %s\n",
719 call->print_fmt);
720 return 0;
Steven Rostedt981d0812009-03-02 13:53:59 -0500721 }
722
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400723 field = v;
724
725 /*
726 * Smartly shows the array type(except dynamic array).
727 * Normal:
728 * field:TYPE VAR
729 * If TYPE := TYPE[LEN], it is shown:
730 * field:TYPE VAR[LEN]
731 */
732 array_descriptor = strchr(field->type, '[');
733
734 if (!strncmp(field->type, "__data_loc", 10))
735 array_descriptor = NULL;
736
737 if (!array_descriptor)
738 seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n",
739 field->type, field->name, field->offset,
740 field->size, !!field->is_signed);
741 else
742 seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n",
743 (int)(array_descriptor - field->type),
744 field->type, field->name,
745 array_descriptor, field->offset,
746 field->size, !!field->is_signed);
747
748 return 0;
749}
750
751static void f_stop(struct seq_file *m, void *p)
752{
753}
754
755static const struct seq_operations trace_format_seq_ops = {
756 .start = f_start,
757 .next = f_next,
758 .stop = f_stop,
759 .show = f_show,
760};
761
762static int trace_format_open(struct inode *inode, struct file *file)
763{
764 struct ftrace_event_call *call = inode->i_private;
765 struct seq_file *m;
766 int ret;
767
768 ret = seq_open(file, &trace_format_seq_ops);
769 if (ret < 0)
770 return ret;
771
772 m = file->private_data;
773 m->private = call;
774
775 return 0;
Steven Rostedt981d0812009-03-02 13:53:59 -0500776}
777
Peter Zijlstra23725ae2009-03-19 20:26:13 +0100778static ssize_t
779event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)
780{
781 struct ftrace_event_call *call = filp->private_data;
782 struct trace_seq *s;
783 int r;
784
785 if (*ppos)
786 return 0;
787
788 s = kmalloc(sizeof(*s), GFP_KERNEL);
789 if (!s)
790 return -ENOMEM;
791
792 trace_seq_init(s);
Steven Rostedt32c0eda2010-04-23 10:38:03 -0400793 trace_seq_printf(s, "%d\n", call->event.type);
Peter Zijlstra23725ae2009-03-19 20:26:13 +0100794
795 r = simple_read_from_buffer(ubuf, cnt, ppos,
796 s->buffer, s->len);
797 kfree(s);
798 return r;
799}
800
Tom Zanussi7ce7e422009-03-22 03:31:04 -0500801static ssize_t
802event_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
803 loff_t *ppos)
804{
805 struct ftrace_event_call *call = filp->private_data;
806 struct trace_seq *s;
807 int r;
808
809 if (*ppos)
810 return 0;
811
812 s = kmalloc(sizeof(*s), GFP_KERNEL);
813 if (!s)
814 return -ENOMEM;
815
816 trace_seq_init(s);
817
Tom Zanussi8b372562009-04-28 03:04:59 -0500818 print_event_filter(call, s);
Tom Zanussi4bda2d52009-03-24 02:14:31 -0500819 r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
Tom Zanussi7ce7e422009-03-22 03:31:04 -0500820
821 kfree(s);
822
823 return r;
824}
825
826static ssize_t
827event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
828 loff_t *ppos)
829{
830 struct ftrace_event_call *call = filp->private_data;
Tom Zanussi8b372562009-04-28 03:04:59 -0500831 char *buf;
Tom Zanussi7ce7e422009-03-22 03:31:04 -0500832 int err;
833
Tom Zanussi8b372562009-04-28 03:04:59 -0500834 if (cnt >= PAGE_SIZE)
Tom Zanussi7ce7e422009-03-22 03:31:04 -0500835 return -EINVAL;
836
Tom Zanussi8b372562009-04-28 03:04:59 -0500837 buf = (char *)__get_free_page(GFP_TEMPORARY);
838 if (!buf)
Tom Zanussi7ce7e422009-03-22 03:31:04 -0500839 return -ENOMEM;
840
Tom Zanussi8b372562009-04-28 03:04:59 -0500841 if (copy_from_user(buf, ubuf, cnt)) {
842 free_page((unsigned long) buf);
843 return -EFAULT;
844 }
845 buf[cnt] = '\0';
846
847 err = apply_event_filter(call, buf);
848 free_page((unsigned long) buf);
849 if (err < 0)
Tom Zanussi7ce7e422009-03-22 03:31:04 -0500850 return err;
Tom Zanussi0a19e532009-04-13 03:17:50 -0500851
Tom Zanussi7ce7e422009-03-22 03:31:04 -0500852 *ppos += cnt;
853
854 return cnt;
855}
856
Steven Rostedte9dbfae2011-07-05 11:36:06 -0400857static LIST_HEAD(event_subsystems);
858
859static int subsystem_open(struct inode *inode, struct file *filp)
860{
861 struct event_subsystem *system = NULL;
862 int ret;
863
Steven Rostedt40ee4df2011-07-05 14:32:51 -0400864 if (!inode->i_private)
865 goto skip_search;
866
Steven Rostedte9dbfae2011-07-05 11:36:06 -0400867 /* Make sure the system still exists */
868 mutex_lock(&event_mutex);
869 list_for_each_entry(system, &event_subsystems, list) {
870 if (system == inode->i_private) {
871 /* Don't open systems with no events */
872 if (!system->nr_events) {
873 system = NULL;
874 break;
875 }
876 __get_system(system);
877 break;
878 }
879 }
880 mutex_unlock(&event_mutex);
881
882 if (system != inode->i_private)
883 return -ENODEV;
884
Steven Rostedt40ee4df2011-07-05 14:32:51 -0400885 skip_search:
Steven Rostedte9dbfae2011-07-05 11:36:06 -0400886 ret = tracing_open_generic(inode, filp);
Steven Rostedt40ee4df2011-07-05 14:32:51 -0400887 if (ret < 0 && system)
Steven Rostedte9dbfae2011-07-05 11:36:06 -0400888 put_system(system);
889
890 return ret;
891}
892
893static int subsystem_release(struct inode *inode, struct file *file)
894{
895 struct event_subsystem *system = inode->i_private;
896
Steven Rostedt40ee4df2011-07-05 14:32:51 -0400897 if (system)
898 put_system(system);
Steven Rostedte9dbfae2011-07-05 11:36:06 -0400899
900 return 0;
901}
902
Tom Zanussicfb180f2009-03-22 03:31:17 -0500903static ssize_t
904subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
905 loff_t *ppos)
906{
907 struct event_subsystem *system = filp->private_data;
908 struct trace_seq *s;
909 int r;
910
911 if (*ppos)
912 return 0;
913
914 s = kmalloc(sizeof(*s), GFP_KERNEL);
915 if (!s)
916 return -ENOMEM;
917
918 trace_seq_init(s);
919
Tom Zanussi8b372562009-04-28 03:04:59 -0500920 print_subsystem_event_filter(system, s);
Tom Zanussi4bda2d52009-03-24 02:14:31 -0500921 r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
Tom Zanussicfb180f2009-03-22 03:31:17 -0500922
923 kfree(s);
924
925 return r;
926}
927
928static ssize_t
929subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
930 loff_t *ppos)
931{
932 struct event_subsystem *system = filp->private_data;
Tom Zanussi8b372562009-04-28 03:04:59 -0500933 char *buf;
Tom Zanussicfb180f2009-03-22 03:31:17 -0500934 int err;
935
Tom Zanussi8b372562009-04-28 03:04:59 -0500936 if (cnt >= PAGE_SIZE)
Tom Zanussicfb180f2009-03-22 03:31:17 -0500937 return -EINVAL;
938
Tom Zanussi8b372562009-04-28 03:04:59 -0500939 buf = (char *)__get_free_page(GFP_TEMPORARY);
940 if (!buf)
Tom Zanussicfb180f2009-03-22 03:31:17 -0500941 return -ENOMEM;
942
Tom Zanussi8b372562009-04-28 03:04:59 -0500943 if (copy_from_user(buf, ubuf, cnt)) {
944 free_page((unsigned long) buf);
945 return -EFAULT;
Tom Zanussicfb180f2009-03-22 03:31:17 -0500946 }
Tom Zanussi8b372562009-04-28 03:04:59 -0500947 buf[cnt] = '\0';
Tom Zanussicfb180f2009-03-22 03:31:17 -0500948
Tom Zanussi8b372562009-04-28 03:04:59 -0500949 err = apply_subsystem_event_filter(system, buf);
950 free_page((unsigned long) buf);
951 if (err < 0)
Li Zefan44e9c8b2009-04-11 15:55:28 +0800952 return err;
Tom Zanussicfb180f2009-03-22 03:31:17 -0500953
954 *ppos += cnt;
955
956 return cnt;
957}
958
Steven Rostedtd1b182a2009-04-15 16:53:47 -0400959static ssize_t
960show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)
961{
962 int (*func)(struct trace_seq *s) = filp->private_data;
963 struct trace_seq *s;
964 int r;
965
966 if (*ppos)
967 return 0;
968
969 s = kmalloc(sizeof(*s), GFP_KERNEL);
970 if (!s)
971 return -ENOMEM;
972
973 trace_seq_init(s);
974
975 func(s);
976 r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
977
978 kfree(s);
979
980 return r;
981}
982
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500983static const struct seq_operations show_event_seq_ops = {
984 .start = t_start,
985 .next = t_next,
986 .show = t_show,
987 .stop = t_stop,
988};
989
990static const struct seq_operations show_set_event_seq_ops = {
991 .start = s_start,
992 .next = s_next,
993 .show = t_show,
994 .stop = t_stop,
995};
996
Steven Rostedt2314c4a2009-03-10 12:04:02 -0400997static const struct file_operations ftrace_avail_fops = {
998 .open = ftrace_event_seq_open,
999 .read = seq_read,
1000 .llseek = seq_lseek,
1001 .release = seq_release,
1002};
1003
Steven Rostedtb77e38a2009-02-24 10:21:36 -05001004static const struct file_operations ftrace_set_event_fops = {
1005 .open = ftrace_event_seq_open,
1006 .read = seq_read,
1007 .write = ftrace_event_write,
1008 .llseek = seq_lseek,
1009 .release = seq_release,
1010};
1011
Steven Rostedt1473e442009-02-24 14:15:08 -05001012static const struct file_operations ftrace_enable_fops = {
1013 .open = tracing_open_generic,
1014 .read = event_enable_read,
1015 .write = event_enable_write,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001016 .llseek = default_llseek,
Steven Rostedt1473e442009-02-24 14:15:08 -05001017};
1018
Steven Rostedt981d0812009-03-02 13:53:59 -05001019static const struct file_operations ftrace_event_format_fops = {
Steven Rostedt2a37a3d2010-06-03 15:21:34 -04001020 .open = trace_format_open,
1021 .read = seq_read,
1022 .llseek = seq_lseek,
1023 .release = seq_release,
Steven Rostedt981d0812009-03-02 13:53:59 -05001024};
1025
Peter Zijlstra23725ae2009-03-19 20:26:13 +01001026static const struct file_operations ftrace_event_id_fops = {
1027 .open = tracing_open_generic,
1028 .read = event_id_read,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001029 .llseek = default_llseek,
Peter Zijlstra23725ae2009-03-19 20:26:13 +01001030};
1031
Tom Zanussi7ce7e422009-03-22 03:31:04 -05001032static const struct file_operations ftrace_event_filter_fops = {
1033 .open = tracing_open_generic,
1034 .read = event_filter_read,
1035 .write = event_filter_write,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001036 .llseek = default_llseek,
Tom Zanussi7ce7e422009-03-22 03:31:04 -05001037};
1038
Tom Zanussicfb180f2009-03-22 03:31:17 -05001039static const struct file_operations ftrace_subsystem_filter_fops = {
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001040 .open = subsystem_open,
Tom Zanussicfb180f2009-03-22 03:31:17 -05001041 .read = subsystem_filter_read,
1042 .write = subsystem_filter_write,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001043 .llseek = default_llseek,
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001044 .release = subsystem_release,
Tom Zanussicfb180f2009-03-22 03:31:17 -05001045};
1046
Steven Rostedt8ae79a12009-05-06 22:52:15 -04001047static const struct file_operations ftrace_system_enable_fops = {
Steven Rostedt40ee4df2011-07-05 14:32:51 -04001048 .open = subsystem_open,
Steven Rostedt8ae79a12009-05-06 22:52:15 -04001049 .read = system_enable_read,
1050 .write = system_enable_write,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001051 .llseek = default_llseek,
Steven Rostedt40ee4df2011-07-05 14:32:51 -04001052 .release = subsystem_release,
Steven Rostedt8ae79a12009-05-06 22:52:15 -04001053};
1054
Steven Rostedtd1b182a2009-04-15 16:53:47 -04001055static const struct file_operations ftrace_show_header_fops = {
1056 .open = tracing_open_generic,
1057 .read = show_header,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001058 .llseek = default_llseek,
Steven Rostedtd1b182a2009-04-15 16:53:47 -04001059};
1060
Steven Rostedt1473e442009-02-24 14:15:08 -05001061static struct dentry *event_trace_events_dir(void)
1062{
1063 static struct dentry *d_tracer;
1064 static struct dentry *d_events;
1065
1066 if (d_events)
1067 return d_events;
1068
1069 d_tracer = tracing_init_dentry();
1070 if (!d_tracer)
1071 return NULL;
1072
1073 d_events = debugfs_create_dir("events", d_tracer);
1074 if (!d_events)
1075 pr_warning("Could not create debugfs "
1076 "'events' directory\n");
1077
1078 return d_events;
1079}
1080
Steven Rostedt6ecc2d12009-02-27 21:33:02 -05001081static struct dentry *
1082event_subsystem_dir(const char *name, struct dentry *d_events)
1083{
1084 struct event_subsystem *system;
Tom Zanussie1112b42009-03-31 00:48:49 -05001085 struct dentry *entry;
Steven Rostedt6ecc2d12009-02-27 21:33:02 -05001086
1087 /* First see if we did not already create this dir */
1088 list_for_each_entry(system, &event_subsystems, list) {
Xiao Guangrongdc82ec98a2009-07-09 16:22:22 +08001089 if (strcmp(system->name, name) == 0) {
1090 system->nr_events++;
Steven Rostedt6ecc2d12009-02-27 21:33:02 -05001091 return system->entry;
Xiao Guangrongdc82ec98a2009-07-09 16:22:22 +08001092 }
Steven Rostedt6ecc2d12009-02-27 21:33:02 -05001093 }
1094
1095 /* need to create new entry */
1096 system = kmalloc(sizeof(*system), GFP_KERNEL);
1097 if (!system) {
1098 pr_warning("No memory to create event subsystem %s\n",
1099 name);
1100 return d_events;
1101 }
1102
1103 system->entry = debugfs_create_dir(name, d_events);
1104 if (!system->entry) {
1105 pr_warning("Could not create event subsystem %s\n",
1106 name);
1107 kfree(system);
1108 return d_events;
1109 }
1110
Xiao Guangrongdc82ec98a2009-07-09 16:22:22 +08001111 system->nr_events = 1;
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001112 system->ref_count = 1;
Steven Rostedt6d723732009-04-10 14:53:50 -04001113 system->name = kstrdup(name, GFP_KERNEL);
1114 if (!system->name) {
1115 debugfs_remove(system->entry);
1116 kfree(system);
1117 return d_events;
1118 }
1119
Steven Rostedt6ecc2d12009-02-27 21:33:02 -05001120 list_add(&system->list, &event_subsystems);
1121
Tom Zanussi30e673b2009-04-28 03:04:47 -05001122 system->filter = NULL;
Tom Zanussicfb180f2009-03-22 03:31:17 -05001123
Tom Zanussi8b372562009-04-28 03:04:59 -05001124 system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL);
1125 if (!system->filter) {
1126 pr_warning("Could not allocate filter for subsystem "
1127 "'%s'\n", name);
1128 return system->entry;
1129 }
1130
Tom Zanussie1112b42009-03-31 00:48:49 -05001131 entry = debugfs_create_file("filter", 0644, system->entry, system,
1132 &ftrace_subsystem_filter_fops);
Tom Zanussi8b372562009-04-28 03:04:59 -05001133 if (!entry) {
1134 kfree(system->filter);
1135 system->filter = NULL;
Tom Zanussie1112b42009-03-31 00:48:49 -05001136 pr_warning("Could not create debugfs "
1137 "'%s/filter' entry\n", name);
Tom Zanussi8b372562009-04-28 03:04:59 -05001138 }
Tom Zanussie1112b42009-03-31 00:48:49 -05001139
Steven Rostedt40ee4df2011-07-05 14:32:51 -04001140 trace_create_file("enable", 0644, system->entry, system,
Frederic Weisbeckerf3f3f002009-09-24 15:27:41 +02001141 &ftrace_system_enable_fops);
Steven Rostedt8ae79a12009-05-06 22:52:15 -04001142
Steven Rostedt6ecc2d12009-02-27 21:33:02 -05001143 return system->entry;
1144}
1145
Steven Rostedt1473e442009-02-24 14:15:08 -05001146static int
Steven Rostedt701970b2009-04-24 23:11:22 -04001147event_create_dir(struct ftrace_event_call *call, struct dentry *d_events,
1148 const struct file_operations *id,
1149 const struct file_operations *enable,
1150 const struct file_operations *filter,
1151 const struct file_operations *format)
Steven Rostedt1473e442009-02-24 14:15:08 -05001152{
Steven Rostedt2e33af02010-04-22 10:35:55 -04001153 struct list_head *head;
Steven Rostedtfd994982009-02-28 02:41:25 -05001154 int ret;
Steven Rostedt1473e442009-02-24 14:15:08 -05001155
Steven Rostedt6ecc2d12009-02-27 21:33:02 -05001156 /*
1157 * If the trace point header did not define TRACE_SYSTEM
1158 * then the system would be called "TRACE_SYSTEM".
1159 */
Steven Rostedt8f082012010-04-20 10:47:33 -04001160 if (strcmp(call->class->system, TRACE_SYSTEM) != 0)
1161 d_events = event_subsystem_dir(call->class->system, d_events);
Steven Rostedt6ecc2d12009-02-27 21:33:02 -05001162
Steven Rostedt1473e442009-02-24 14:15:08 -05001163 call->dir = debugfs_create_dir(call->name, d_events);
1164 if (!call->dir) {
1165 pr_warning("Could not create debugfs "
1166 "'%s' directory\n", call->name);
1167 return -1;
1168 }
1169
Steven Rostedt9b637762012-05-10 15:55:43 -04001170 if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE))
Frederic Weisbeckerf3f3f002009-09-24 15:27:41 +02001171 trace_create_file("enable", 0644, call->dir, call,
1172 enable);
Steven Rostedt1473e442009-02-24 14:15:08 -05001173
Steven Rostedt22392912010-04-21 12:27:06 -04001174#ifdef CONFIG_PERF_EVENTS
Steven Rostedta1d0ce82010-06-08 11:22:06 -04001175 if (call->event.type && call->class->reg)
Frederic Weisbeckerf3f3f002009-09-24 15:27:41 +02001176 trace_create_file("id", 0444, call->dir, call,
1177 id);
Steven Rostedt22392912010-04-21 12:27:06 -04001178#endif
Peter Zijlstra23725ae2009-03-19 20:26:13 +01001179
Li Zefanc9d932c2010-05-24 16:24:28 +08001180 /*
1181 * Other events may have the same class. Only update
1182 * the fields if they are not already defined.
1183 */
1184 head = trace_get_fields(call);
1185 if (list_empty(head)) {
1186 ret = call->class->define_fields(call);
1187 if (ret < 0) {
1188 pr_warning("Could not initialize trace point"
1189 " events/%s\n", call->name);
1190 return ret;
Tom Zanussicf027f62009-03-22 03:30:39 -05001191 }
1192 }
Li Zefanc9d932c2010-05-24 16:24:28 +08001193 trace_create_file("filter", 0644, call->dir, call,
1194 filter);
Tom Zanussicf027f62009-03-22 03:30:39 -05001195
Frederic Weisbeckerf3f3f002009-09-24 15:27:41 +02001196 trace_create_file("format", 0444, call->dir, call,
1197 format);
Steven Rostedtfd994982009-02-28 02:41:25 -05001198
Steven Rostedt1473e442009-02-24 14:15:08 -05001199 return 0;
1200}
1201
Li Zefan67ead0a2010-05-24 16:25:13 +08001202static int
1203__trace_add_event_call(struct ftrace_event_call *call, struct module *mod,
1204 const struct file_operations *id,
1205 const struct file_operations *enable,
1206 const struct file_operations *filter,
1207 const struct file_operations *format)
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001208{
1209 struct dentry *d_events;
1210 int ret;
Steven Rostedt6d723732009-04-10 14:53:50 -04001211
Li Zefan67ead0a2010-05-24 16:25:13 +08001212 /* The linker may leave blanks */
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001213 if (!call->name)
1214 return -EINVAL;
Steven Rostedt701970b2009-04-24 23:11:22 -04001215
Steven Rostedt0405ab82010-04-22 11:46:44 -04001216 if (call->class->raw_init) {
1217 ret = call->class->raw_init(call);
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001218 if (ret < 0) {
1219 if (ret != -ENOSYS)
Li Zefan67ead0a2010-05-24 16:25:13 +08001220 pr_warning("Could not initialize trace events/%s\n",
1221 call->name);
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001222 return ret;
1223 }
1224 }
Steven Rostedt701970b2009-04-24 23:11:22 -04001225
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001226 d_events = event_trace_events_dir();
1227 if (!d_events)
1228 return -ENOENT;
1229
Li Zefan67ead0a2010-05-24 16:25:13 +08001230 ret = event_create_dir(call, d_events, id, enable, filter, format);
Masami Hiramatsu88f70d72009-09-25 11:20:54 -07001231 if (!ret)
1232 list_add(&call->list, &ftrace_events);
Li Zefan67ead0a2010-05-24 16:25:13 +08001233 call->mod = mod;
Masami Hiramatsu88f70d72009-09-25 11:20:54 -07001234
Masami Hiramatsu588bebb2009-09-16 11:42:55 -04001235 return ret;
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001236}
1237
1238/* Add an additional event_call dynamically */
1239int trace_add_event_call(struct ftrace_event_call *call)
1240{
1241 int ret;
1242 mutex_lock(&event_mutex);
Li Zefan67ead0a2010-05-24 16:25:13 +08001243 ret = __trace_add_event_call(call, NULL, &ftrace_event_id_fops,
1244 &ftrace_enable_fops,
1245 &ftrace_event_filter_fops,
1246 &ftrace_event_format_fops);
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001247 mutex_unlock(&event_mutex);
1248 return ret;
1249}
Steven Rostedt701970b2009-04-24 23:11:22 -04001250
Frederic Weisbeckera2ca5e02009-08-06 07:32:21 +02001251static void remove_subsystem_dir(const char *name)
1252{
1253 struct event_subsystem *system;
1254
1255 if (strcmp(name, TRACE_SYSTEM) == 0)
1256 return;
1257
1258 list_for_each_entry(system, &event_subsystems, list) {
1259 if (strcmp(system->name, name) == 0) {
1260 if (!--system->nr_events) {
Frederic Weisbeckera2ca5e02009-08-06 07:32:21 +02001261 debugfs_remove_recursive(system->entry);
1262 list_del(&system->list);
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001263 __put_system(system);
Frederic Weisbeckera2ca5e02009-08-06 07:32:21 +02001264 }
1265 break;
1266 }
1267 }
1268}
1269
Masami Hiramatsu4fead8e2009-09-14 16:49:12 -04001270/*
1271 * Must be called under locking both of event_mutex and trace_event_mutex.
1272 */
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001273static void __trace_remove_event_call(struct ftrace_event_call *call)
1274{
1275 ftrace_event_enable_disable(call, 0);
Steven Rostedt80decc72010-04-23 10:00:22 -04001276 if (call->event.funcs)
1277 __unregister_ftrace_event(&call->event);
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001278 debugfs_remove_recursive(call->dir);
1279 list_del(&call->list);
1280 trace_destroy_fields(call);
1281 destroy_preds(call);
Steven Rostedt8f082012010-04-20 10:47:33 -04001282 remove_subsystem_dir(call->class->system);
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001283}
1284
1285/* Remove an event_call */
1286void trace_remove_event_call(struct ftrace_event_call *call)
1287{
1288 mutex_lock(&event_mutex);
Masami Hiramatsu4fead8e2009-09-14 16:49:12 -04001289 down_write(&trace_event_mutex);
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001290 __trace_remove_event_call(call);
Masami Hiramatsu4fead8e2009-09-14 16:49:12 -04001291 up_write(&trace_event_mutex);
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001292 mutex_unlock(&event_mutex);
1293}
1294
1295#define for_each_event(event, start, end) \
1296 for (event = start; \
1297 (unsigned long)event < (unsigned long)end; \
1298 event++)
1299
1300#ifdef CONFIG_MODULES
1301
1302static LIST_HEAD(ftrace_module_file_list);
1303
1304/*
1305 * Modules must own their file_operations to keep up with
1306 * reference counting.
1307 */
1308struct ftrace_module_file_ops {
1309 struct list_head list;
1310 struct module *mod;
1311 struct file_operations id;
1312 struct file_operations enable;
1313 struct file_operations format;
1314 struct file_operations filter;
1315};
1316
Steven Rostedt701970b2009-04-24 23:11:22 -04001317static struct ftrace_module_file_ops *
1318trace_create_file_ops(struct module *mod)
1319{
1320 struct ftrace_module_file_ops *file_ops;
1321
1322 /*
1323 * This is a bit of a PITA. To allow for correct reference
1324 * counting, modules must "own" their file_operations.
1325 * To do this, we allocate the file operations that will be
1326 * used in the event directory.
1327 */
1328
1329 file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL);
1330 if (!file_ops)
1331 return NULL;
1332
1333 file_ops->mod = mod;
1334
1335 file_ops->id = ftrace_event_id_fops;
1336 file_ops->id.owner = mod;
1337
1338 file_ops->enable = ftrace_enable_fops;
1339 file_ops->enable.owner = mod;
1340
1341 file_ops->filter = ftrace_event_filter_fops;
1342 file_ops->filter.owner = mod;
1343
1344 file_ops->format = ftrace_event_format_fops;
1345 file_ops->format.owner = mod;
1346
1347 list_add(&file_ops->list, &ftrace_module_file_list);
1348
1349 return file_ops;
1350}
1351
Steven Rostedt6d723732009-04-10 14:53:50 -04001352static void trace_module_add_events(struct module *mod)
1353{
Steven Rostedt701970b2009-04-24 23:11:22 -04001354 struct ftrace_module_file_ops *file_ops = NULL;
Steven Rostedte4a9ea52011-01-27 09:15:30 -05001355 struct ftrace_event_call **call, **start, **end;
Steven Rostedt6d723732009-04-10 14:53:50 -04001356
1357 start = mod->trace_events;
1358 end = mod->trace_events + mod->num_trace_events;
1359
1360 if (start == end)
1361 return;
1362
Li Zefan67ead0a2010-05-24 16:25:13 +08001363 file_ops = trace_create_file_ops(mod);
1364 if (!file_ops)
Steven Rostedt6d723732009-04-10 14:53:50 -04001365 return;
1366
1367 for_each_event(call, start, end) {
Steven Rostedte4a9ea52011-01-27 09:15:30 -05001368 __trace_add_event_call(*call, mod,
Masami Hiramatsu88f70d72009-09-25 11:20:54 -07001369 &file_ops->id, &file_ops->enable,
1370 &file_ops->filter, &file_ops->format);
Steven Rostedt6d723732009-04-10 14:53:50 -04001371 }
1372}
1373
1374static void trace_module_remove_events(struct module *mod)
1375{
Steven Rostedt701970b2009-04-24 23:11:22 -04001376 struct ftrace_module_file_ops *file_ops;
Steven Rostedt6d723732009-04-10 14:53:50 -04001377 struct ftrace_event_call *call, *p;
Steven Rostedt9456f0f2009-05-06 21:54:09 -04001378 bool found = false;
Steven Rostedt6d723732009-04-10 14:53:50 -04001379
Steven Rostedt110bf2b2009-06-09 17:29:07 -04001380 down_write(&trace_event_mutex);
Steven Rostedt6d723732009-04-10 14:53:50 -04001381 list_for_each_entry_safe(call, p, &ftrace_events, list) {
1382 if (call->mod == mod) {
Steven Rostedt9456f0f2009-05-06 21:54:09 -04001383 found = true;
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001384 __trace_remove_event_call(call);
Steven Rostedt6d723732009-04-10 14:53:50 -04001385 }
1386 }
Steven Rostedt701970b2009-04-24 23:11:22 -04001387
1388 /* Now free the file_operations */
1389 list_for_each_entry(file_ops, &ftrace_module_file_list, list) {
1390 if (file_ops->mod == mod)
1391 break;
1392 }
1393 if (&file_ops->list != &ftrace_module_file_list) {
1394 list_del(&file_ops->list);
1395 kfree(file_ops);
1396 }
Steven Rostedt9456f0f2009-05-06 21:54:09 -04001397
1398 /*
1399 * It is safest to reset the ring buffer if the module being unloaded
1400 * registered any events.
1401 */
1402 if (found)
1403 tracing_reset_current_online_cpus();
Steven Rostedt110bf2b2009-06-09 17:29:07 -04001404 up_write(&trace_event_mutex);
Steven Rostedt6d723732009-04-10 14:53:50 -04001405}
1406
Steven Rostedt61f919a2009-04-14 18:22:32 -04001407static int trace_module_notify(struct notifier_block *self,
1408 unsigned long val, void *data)
Steven Rostedt6d723732009-04-10 14:53:50 -04001409{
1410 struct module *mod = data;
1411
1412 mutex_lock(&event_mutex);
1413 switch (val) {
1414 case MODULE_STATE_COMING:
1415 trace_module_add_events(mod);
1416 break;
1417 case MODULE_STATE_GOING:
1418 trace_module_remove_events(mod);
1419 break;
1420 }
1421 mutex_unlock(&event_mutex);
1422
1423 return 0;
1424}
Steven Rostedt61f919a2009-04-14 18:22:32 -04001425#else
1426static int trace_module_notify(struct notifier_block *self,
1427 unsigned long val, void *data)
1428{
1429 return 0;
1430}
1431#endif /* CONFIG_MODULES */
Steven Rostedt6d723732009-04-10 14:53:50 -04001432
Steven Rostedtec827c72009-09-14 10:50:23 -04001433static struct notifier_block trace_module_nb = {
Steven Rostedt6d723732009-04-10 14:53:50 -04001434 .notifier_call = trace_module_notify,
1435 .priority = 0,
1436};
1437
Steven Rostedte4a9ea52011-01-27 09:15:30 -05001438extern struct ftrace_event_call *__start_ftrace_events[];
1439extern struct ftrace_event_call *__stop_ftrace_events[];
Steven Rostedta59fd602009-04-10 13:52:20 -04001440
Li Zefan020e5f82009-07-01 10:47:05 +08001441static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata;
1442
1443static __init int setup_trace_event(char *str)
1444{
1445 strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE);
1446 ring_buffer_expanded = 1;
1447 tracing_selftest_disabled = 1;
1448
1449 return 1;
1450}
1451__setup("trace_event=", setup_trace_event);
1452
Steven Rostedtb77e38a2009-02-24 10:21:36 -05001453static __init int event_trace_init(void)
1454{
Steven Rostedte4a9ea52011-01-27 09:15:30 -05001455 struct ftrace_event_call **call;
Steven Rostedtb77e38a2009-02-24 10:21:36 -05001456 struct dentry *d_tracer;
1457 struct dentry *entry;
Steven Rostedt1473e442009-02-24 14:15:08 -05001458 struct dentry *d_events;
Steven Rostedt6d723732009-04-10 14:53:50 -04001459 int ret;
Li Zefan020e5f82009-07-01 10:47:05 +08001460 char *buf = bootup_event_buf;
1461 char *token;
Steven Rostedtb77e38a2009-02-24 10:21:36 -05001462
1463 d_tracer = tracing_init_dentry();
1464 if (!d_tracer)
1465 return 0;
1466
Steven Rostedt2314c4a2009-03-10 12:04:02 -04001467 entry = debugfs_create_file("available_events", 0444, d_tracer,
1468 (void *)&show_event_seq_ops,
1469 &ftrace_avail_fops);
1470 if (!entry)
1471 pr_warning("Could not create debugfs "
1472 "'available_events' entry\n");
1473
Steven Rostedtb77e38a2009-02-24 10:21:36 -05001474 entry = debugfs_create_file("set_event", 0644, d_tracer,
1475 (void *)&show_set_event_seq_ops,
1476 &ftrace_set_event_fops);
1477 if (!entry)
1478 pr_warning("Could not create debugfs "
1479 "'set_event' entry\n");
1480
Steven Rostedt1473e442009-02-24 14:15:08 -05001481 d_events = event_trace_events_dir();
1482 if (!d_events)
1483 return 0;
1484
Steven Rostedtd1b182a2009-04-15 16:53:47 -04001485 /* ring buffer internal formats */
1486 trace_create_file("header_page", 0444, d_events,
1487 ring_buffer_print_page_header,
1488 &ftrace_show_header_fops);
1489
1490 trace_create_file("header_event", 0444, d_events,
1491 ring_buffer_print_entry_header,
1492 &ftrace_show_header_fops);
1493
Steven Rostedt8ae79a12009-05-06 22:52:15 -04001494 trace_create_file("enable", 0644, d_events,
Li Zefan8f31bfe2009-05-08 10:31:42 +08001495 NULL, &ftrace_system_enable_fops);
Steven Rostedt8ae79a12009-05-06 22:52:15 -04001496
Li Zefan8728fe52010-05-24 16:22:49 +08001497 if (trace_define_common_fields())
1498 pr_warning("tracing: Failed to allocate common fields");
1499
Steven Rostedt6d723732009-04-10 14:53:50 -04001500 for_each_event(call, __start_ftrace_events, __stop_ftrace_events) {
Steven Rostedte4a9ea52011-01-27 09:15:30 -05001501 __trace_add_event_call(*call, NULL, &ftrace_event_id_fops,
Masami Hiramatsu88f70d72009-09-25 11:20:54 -07001502 &ftrace_enable_fops,
1503 &ftrace_event_filter_fops,
1504 &ftrace_event_format_fops);
Steven Rostedt1473e442009-02-24 14:15:08 -05001505 }
1506
Li Zefan020e5f82009-07-01 10:47:05 +08001507 while (true) {
1508 token = strsep(&buf, ",");
1509
1510 if (!token)
1511 break;
1512 if (!*token)
1513 continue;
1514
1515 ret = ftrace_set_clr_event(token, 1);
1516 if (ret)
1517 pr_warning("Failed to enable trace event: %s\n", token);
1518 }
1519
Steven Rostedt6d723732009-04-10 14:53:50 -04001520 ret = register_module_notifier(&trace_module_nb);
Ming Lei55379372009-05-18 23:04:46 +08001521 if (ret)
Steven Rostedt6d723732009-04-10 14:53:50 -04001522 pr_warning("Failed to register trace events module notifier\n");
1523
Steven Rostedtb77e38a2009-02-24 10:21:36 -05001524 return 0;
1525}
1526fs_initcall(event_trace_init);
Steven Rostedte6187002009-04-15 13:36:40 -04001527
1528#ifdef CONFIG_FTRACE_STARTUP_TEST
1529
1530static DEFINE_SPINLOCK(test_spinlock);
1531static DEFINE_SPINLOCK(test_spinlock_irq);
1532static DEFINE_MUTEX(test_mutex);
1533
1534static __init void test_work(struct work_struct *dummy)
1535{
1536 spin_lock(&test_spinlock);
1537 spin_lock_irq(&test_spinlock_irq);
1538 udelay(1);
1539 spin_unlock_irq(&test_spinlock_irq);
1540 spin_unlock(&test_spinlock);
1541
1542 mutex_lock(&test_mutex);
1543 msleep(1);
1544 mutex_unlock(&test_mutex);
1545}
1546
1547static __init int event_test_thread(void *unused)
1548{
1549 void *test_malloc;
1550
1551 test_malloc = kmalloc(1234, GFP_KERNEL);
1552 if (!test_malloc)
1553 pr_info("failed to kmalloc\n");
1554
1555 schedule_on_each_cpu(test_work);
1556
1557 kfree(test_malloc);
1558
1559 set_current_state(TASK_INTERRUPTIBLE);
1560 while (!kthread_should_stop())
1561 schedule();
1562
1563 return 0;
1564}
1565
1566/*
1567 * Do various things that may trigger events.
1568 */
1569static __init void event_test_stuff(void)
1570{
1571 struct task_struct *test_thread;
1572
1573 test_thread = kthread_run(event_test_thread, NULL, "test-events");
1574 msleep(1);
1575 kthread_stop(test_thread);
1576}
1577
1578/*
1579 * For every trace event defined, we will test each trace point separately,
1580 * and then by groups, and finally all trace points.
1581 */
Steven Rostedt9ea21c12009-04-16 12:15:44 -04001582static __init void event_trace_self_tests(void)
Steven Rostedte6187002009-04-15 13:36:40 -04001583{
1584 struct ftrace_event_call *call;
1585 struct event_subsystem *system;
Steven Rostedte6187002009-04-15 13:36:40 -04001586 int ret;
1587
1588 pr_info("Running tests on trace events:\n");
1589
1590 list_for_each_entry(call, &ftrace_events, list) {
1591
Steven Rostedt22392912010-04-21 12:27:06 -04001592 /* Only test those that have a probe */
1593 if (!call->class || !call->class->probe)
Steven Rostedte6187002009-04-15 13:36:40 -04001594 continue;
1595
Steven Rostedt1f5a6b42009-09-14 11:58:24 -04001596/*
1597 * Testing syscall events here is pretty useless, but
1598 * we still do it if configured. But this is time consuming.
1599 * What we really need is a user thread to perform the
1600 * syscalls as we test.
1601 */
1602#ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS
Steven Rostedt8f082012010-04-20 10:47:33 -04001603 if (call->class->system &&
1604 strcmp(call->class->system, "syscalls") == 0)
Steven Rostedt1f5a6b42009-09-14 11:58:24 -04001605 continue;
1606#endif
1607
Steven Rostedte6187002009-04-15 13:36:40 -04001608 pr_info("Testing event %s: ", call->name);
1609
1610 /*
1611 * If an event is already enabled, someone is using
1612 * it and the self test should not be on.
1613 */
Steven Rostedt553552c2010-04-23 11:12:36 -04001614 if (call->flags & TRACE_EVENT_FL_ENABLED) {
Steven Rostedte6187002009-04-15 13:36:40 -04001615 pr_warning("Enabled event during self test!\n");
1616 WARN_ON_ONCE(1);
1617 continue;
1618 }
1619
Zhaolei0e907c92009-05-25 18:13:59 +08001620 ftrace_event_enable_disable(call, 1);
Steven Rostedte6187002009-04-15 13:36:40 -04001621 event_test_stuff();
Zhaolei0e907c92009-05-25 18:13:59 +08001622 ftrace_event_enable_disable(call, 0);
Steven Rostedte6187002009-04-15 13:36:40 -04001623
1624 pr_cont("OK\n");
1625 }
1626
1627 /* Now test at the sub system level */
1628
1629 pr_info("Running tests on trace event systems:\n");
1630
1631 list_for_each_entry(system, &event_subsystems, list) {
1632
1633 /* the ftrace system is special, skip it */
1634 if (strcmp(system->name, "ftrace") == 0)
1635 continue;
1636
1637 pr_info("Testing event system %s: ", system->name);
1638
Li Zefan8f31bfe2009-05-08 10:31:42 +08001639 ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1);
Steven Rostedte6187002009-04-15 13:36:40 -04001640 if (WARN_ON_ONCE(ret)) {
1641 pr_warning("error enabling system %s\n",
1642 system->name);
1643 continue;
1644 }
1645
1646 event_test_stuff();
1647
Li Zefan8f31bfe2009-05-08 10:31:42 +08001648 ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0);
Steven Rostedte6187002009-04-15 13:36:40 -04001649 if (WARN_ON_ONCE(ret))
1650 pr_warning("error disabling system %s\n",
1651 system->name);
1652
1653 pr_cont("OK\n");
1654 }
1655
1656 /* Test with all events enabled */
1657
1658 pr_info("Running tests on all trace events:\n");
1659 pr_info("Testing all events: ");
1660
Li Zefan8f31bfe2009-05-08 10:31:42 +08001661 ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1);
Steven Rostedte6187002009-04-15 13:36:40 -04001662 if (WARN_ON_ONCE(ret)) {
Steven Rostedte6187002009-04-15 13:36:40 -04001663 pr_warning("error enabling all events\n");
Steven Rostedt9ea21c12009-04-16 12:15:44 -04001664 return;
Steven Rostedte6187002009-04-15 13:36:40 -04001665 }
1666
1667 event_test_stuff();
1668
1669 /* reset sysname */
Li Zefan8f31bfe2009-05-08 10:31:42 +08001670 ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0);
Steven Rostedte6187002009-04-15 13:36:40 -04001671 if (WARN_ON_ONCE(ret)) {
1672 pr_warning("error disabling all events\n");
Steven Rostedt9ea21c12009-04-16 12:15:44 -04001673 return;
Steven Rostedte6187002009-04-15 13:36:40 -04001674 }
1675
1676 pr_cont("OK\n");
Steven Rostedt9ea21c12009-04-16 12:15:44 -04001677}
1678
1679#ifdef CONFIG_FUNCTION_TRACER
1680
Tejun Heo245b2e72009-06-24 15:13:48 +09001681static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable);
Steven Rostedt9ea21c12009-04-16 12:15:44 -04001682
1683static void
1684function_test_events_call(unsigned long ip, unsigned long parent_ip)
1685{
1686 struct ring_buffer_event *event;
Steven Rostedte77405a2009-09-02 14:17:06 -04001687 struct ring_buffer *buffer;
Steven Rostedt9ea21c12009-04-16 12:15:44 -04001688 struct ftrace_entry *entry;
1689 unsigned long flags;
1690 long disabled;
Steven Rostedt9ea21c12009-04-16 12:15:44 -04001691 int cpu;
1692 int pc;
1693
1694 pc = preempt_count();
Steven Rostedt5168ae52010-06-03 09:36:50 -04001695 preempt_disable_notrace();
Steven Rostedt9ea21c12009-04-16 12:15:44 -04001696 cpu = raw_smp_processor_id();
Tejun Heo245b2e72009-06-24 15:13:48 +09001697 disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu));
Steven Rostedt9ea21c12009-04-16 12:15:44 -04001698
1699 if (disabled != 1)
1700 goto out;
1701
1702 local_save_flags(flags);
1703
Steven Rostedte77405a2009-09-02 14:17:06 -04001704 event = trace_current_buffer_lock_reserve(&buffer,
1705 TRACE_FN, sizeof(*entry),
Steven Rostedt9ea21c12009-04-16 12:15:44 -04001706 flags, pc);
1707 if (!event)
1708 goto out;
1709 entry = ring_buffer_event_data(event);
1710 entry->ip = ip;
1711 entry->parent_ip = parent_ip;
1712
Steven Rostedte77405a2009-09-02 14:17:06 -04001713 trace_nowake_buffer_unlock_commit(buffer, event, flags, pc);
Steven Rostedt9ea21c12009-04-16 12:15:44 -04001714
1715 out:
Tejun Heo245b2e72009-06-24 15:13:48 +09001716 atomic_dec(&per_cpu(ftrace_test_event_disable, cpu));
Steven Rostedt5168ae52010-06-03 09:36:50 -04001717 preempt_enable_notrace();
Steven Rostedt9ea21c12009-04-16 12:15:44 -04001718}
1719
1720static struct ftrace_ops trace_ops __initdata =
1721{
1722 .func = function_test_events_call,
1723};
1724
1725static __init void event_trace_self_test_with_function(void)
1726{
Steven Rostedt17bb6152011-05-23 15:27:46 -04001727 int ret;
1728 ret = register_ftrace_function(&trace_ops);
1729 if (WARN_ON(ret < 0)) {
1730 pr_info("Failed to enable function tracer for event tests\n");
1731 return;
1732 }
Steven Rostedt9ea21c12009-04-16 12:15:44 -04001733 pr_info("Running tests again, along with the function tracer\n");
1734 event_trace_self_tests();
1735 unregister_ftrace_function(&trace_ops);
1736}
1737#else
1738static __init void event_trace_self_test_with_function(void)
1739{
1740}
1741#endif
1742
1743static __init int event_trace_self_tests_init(void)
1744{
Li Zefan020e5f82009-07-01 10:47:05 +08001745 if (!tracing_selftest_disabled) {
1746 event_trace_self_tests();
1747 event_trace_self_test_with_function();
1748 }
Steven Rostedte6187002009-04-15 13:36:40 -04001749
1750 return 0;
1751}
1752
Steven Rostedt28d20e22009-04-20 12:12:44 -04001753late_initcall(event_trace_self_tests_init);
Steven Rostedte6187002009-04-15 13:36:40 -04001754
1755#endif