blob: 5892470bc2ee587881a49bad3619a99b3851210e [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 Rostedt91729ef92009-03-02 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 Rostedt6e94a782013-06-27 10:58:31 -040044#define SYSTEM_FL_FREE_NAME (1 << 31)
45
46static inline int system_refcount(struct event_subsystem *system)
47{
48 return system->ref_count & ~SYSTEM_FL_FREE_NAME;
49}
50
51static int system_refcount_inc(struct event_subsystem *system)
52{
53 return (system->ref_count++) & ~SYSTEM_FL_FREE_NAME;
54}
55
56static int system_refcount_dec(struct event_subsystem *system)
57{
58 return (--system->ref_count) & ~SYSTEM_FL_FREE_NAME;
59}
60
Steven Rostedtae63b312012-05-03 23:09:03 -040061/* Double loops, do not use break, only goto's work */
62#define do_for_each_event_file(tr, file) \
63 list_for_each_entry(tr, &ftrace_trace_arrays, list) { \
64 list_for_each_entry(file, &tr->events, list)
65
66#define do_for_each_event_file_safe(tr, file) \
67 list_for_each_entry(tr, &ftrace_trace_arrays, list) { \
68 struct ftrace_event_file *___n; \
69 list_for_each_entry_safe(file, ___n, &tr->events, list)
70
71#define while_for_each_event_file() \
72 }
73
zhangwei(Jovi)b3a8c6f2013-03-11 15:13:42 +080074static struct list_head *
Steven Rostedt2e33af02010-04-22 10:35:55 -040075trace_get_fields(struct ftrace_event_call *event_call)
76{
77 if (!event_call->class->get_fields)
78 return &event_call->class->fields;
79 return event_call->class->get_fields(event_call);
80}
81
zhangwei(Jovi)b3a8c6f2013-03-11 15:13:42 +080082static struct ftrace_event_field *
83__find_event_field(struct list_head *head, char *name)
84{
85 struct ftrace_event_field *field;
86
87 list_for_each_entry(field, head, link) {
88 if (!strcmp(field->name, name))
89 return field;
90 }
91
92 return NULL;
93}
94
95struct ftrace_event_field *
96trace_find_event_field(struct ftrace_event_call *call, char *name)
97{
98 struct ftrace_event_field *field;
99 struct list_head *head;
100
101 field = __find_event_field(&ftrace_common_fields, name);
102 if (field)
103 return field;
104
105 head = trace_get_fields(call);
106 return __find_event_field(head, name);
107}
108
Li Zefan8728fe52010-05-24 16:22:49 +0800109static int __trace_define_field(struct list_head *head, const char *type,
110 const char *name, int offset, int size,
111 int is_signed, int filter_type)
Tom Zanussicf027f62009-03-22 03:30:39 -0500112{
113 struct ftrace_event_field *field;
114
Steven Rostedtd1a29142013-02-27 20:23:57 -0500115 field = kmem_cache_alloc(field_cachep, GFP_TRACE);
Tom Zanussicf027f62009-03-22 03:30:39 -0500116 if (!field)
Namhyung Kimaaf6ac02013-06-07 15:07:48 +0900117 return -ENOMEM;
Ingo Molnarfe9f57f2009-03-22 18:41:59 +0100118
Steven Rostedt92edca02013-02-27 20:41:37 -0500119 field->name = name;
120 field->type = type;
Ingo Molnarfe9f57f2009-03-22 18:41:59 +0100121
Li Zefan43b51ea2009-08-07 10:33:22 +0800122 if (filter_type == FILTER_OTHER)
123 field->filter_type = filter_assign_type(type);
124 else
125 field->filter_type = filter_type;
126
Tom Zanussicf027f62009-03-22 03:30:39 -0500127 field->offset = offset;
128 field->size = size;
Tom Zanussia118e4d2009-04-28 03:04:53 -0500129 field->is_signed = is_signed;
Li Zefanaa38e9f2009-08-07 10:33:02 +0800130
Steven Rostedt2e33af02010-04-22 10:35:55 -0400131 list_add(&field->link, head);
Tom Zanussicf027f62009-03-22 03:30:39 -0500132
133 return 0;
Tom Zanussicf027f62009-03-22 03:30:39 -0500134}
Li Zefan8728fe52010-05-24 16:22:49 +0800135
136int trace_define_field(struct ftrace_event_call *call, const char *type,
137 const char *name, int offset, int size, int is_signed,
138 int filter_type)
139{
140 struct list_head *head;
141
142 if (WARN_ON(!call->class))
143 return 0;
144
145 head = trace_get_fields(call);
146 return __trace_define_field(head, type, name, offset, size,
147 is_signed, filter_type);
148}
Steven Rostedt17c873e2009-04-10 18:12:50 -0400149EXPORT_SYMBOL_GPL(trace_define_field);
Tom Zanussicf027f62009-03-22 03:30:39 -0500150
Li Zefane647d6b2009-08-19 15:54:32 +0800151#define __common_field(type, item) \
Li Zefan8728fe52010-05-24 16:22:49 +0800152 ret = __trace_define_field(&ftrace_common_fields, #type, \
153 "common_" #item, \
154 offsetof(typeof(ent), item), \
155 sizeof(ent.item), \
156 is_signed_type(type), FILTER_OTHER); \
Li Zefane647d6b2009-08-19 15:54:32 +0800157 if (ret) \
158 return ret;
159
Li Zefan8728fe52010-05-24 16:22:49 +0800160static int trace_define_common_fields(void)
Li Zefane647d6b2009-08-19 15:54:32 +0800161{
162 int ret;
163 struct trace_entry ent;
164
165 __common_field(unsigned short, type);
166 __common_field(unsigned char, flags);
167 __common_field(unsigned char, preempt_count);
168 __common_field(int, pid);
Li Zefane647d6b2009-08-19 15:54:32 +0800169
170 return ret;
171}
172
zhangwei(Jovi)ad7067c2013-03-11 15:13:46 +0800173static void trace_destroy_fields(struct ftrace_event_call *call)
Li Zefan2df75e42009-05-06 10:33:04 +0800174{
175 struct ftrace_event_field *field, *next;
Steven Rostedt2e33af02010-04-22 10:35:55 -0400176 struct list_head *head;
Li Zefan2df75e42009-05-06 10:33:04 +0800177
Steven Rostedt2e33af02010-04-22 10:35:55 -0400178 head = trace_get_fields(call);
179 list_for_each_entry_safe(field, next, head, link) {
Li Zefan2df75e42009-05-06 10:33:04 +0800180 list_del(&field->link);
Steven Rostedtd1a29142013-02-27 20:23:57 -0500181 kmem_cache_free(field_cachep, field);
Li Zefan2df75e42009-05-06 10:33:04 +0800182 }
183}
184
Li Zefan87d9b4e2009-12-08 11:14:20 +0800185int trace_event_raw_init(struct ftrace_event_call *call)
186{
187 int id;
188
Steven Rostedt80decc72010-04-23 10:00:22 -0400189 id = register_ftrace_event(&call->event);
Li Zefan87d9b4e2009-12-08 11:14:20 +0800190 if (!id)
191 return -ENODEV;
Li Zefan87d9b4e2009-12-08 11:14:20 +0800192
193 return 0;
194}
195EXPORT_SYMBOL_GPL(trace_event_raw_init);
196
Jiri Olsaceec0b62012-02-15 15:51:49 +0100197int ftrace_event_reg(struct ftrace_event_call *call,
198 enum trace_reg type, void *data)
Steven Rostedta1d0ce82010-06-08 11:22:06 -0400199{
Steven Rostedtae63b312012-05-03 23:09:03 -0400200 struct ftrace_event_file *file = data;
201
Steven Rostedta1d0ce82010-06-08 11:22:06 -0400202 switch (type) {
203 case TRACE_REG_REGISTER:
204 return tracepoint_probe_register(call->name,
205 call->class->probe,
Steven Rostedtae63b312012-05-03 23:09:03 -0400206 file);
Steven Rostedta1d0ce82010-06-08 11:22:06 -0400207 case TRACE_REG_UNREGISTER:
208 tracepoint_probe_unregister(call->name,
209 call->class->probe,
Steven Rostedtae63b312012-05-03 23:09:03 -0400210 file);
Steven Rostedta1d0ce82010-06-08 11:22:06 -0400211 return 0;
212
213#ifdef CONFIG_PERF_EVENTS
214 case TRACE_REG_PERF_REGISTER:
215 return tracepoint_probe_register(call->name,
216 call->class->perf_probe,
217 call);
218 case TRACE_REG_PERF_UNREGISTER:
219 tracepoint_probe_unregister(call->name,
220 call->class->perf_probe,
221 call);
222 return 0;
Jiri Olsaceec0b62012-02-15 15:51:49 +0100223 case TRACE_REG_PERF_OPEN:
224 case TRACE_REG_PERF_CLOSE:
Jiri Olsa489c75c2012-02-15 15:51:50 +0100225 case TRACE_REG_PERF_ADD:
226 case TRACE_REG_PERF_DEL:
Jiri Olsaceec0b62012-02-15 15:51:49 +0100227 return 0;
Steven Rostedta1d0ce82010-06-08 11:22:06 -0400228#endif
229 }
230 return 0;
231}
232EXPORT_SYMBOL_GPL(ftrace_event_reg);
233
Li Zefane870e9a2010-07-02 11:07:32 +0800234void trace_event_enable_cmd_record(bool enable)
235{
Steven Rostedtae63b312012-05-03 23:09:03 -0400236 struct ftrace_event_file *file;
237 struct trace_array *tr;
Li Zefane870e9a2010-07-02 11:07:32 +0800238
239 mutex_lock(&event_mutex);
Steven Rostedtae63b312012-05-03 23:09:03 -0400240 do_for_each_event_file(tr, file) {
241
242 if (!(file->flags & FTRACE_EVENT_FL_ENABLED))
Li Zefane870e9a2010-07-02 11:07:32 +0800243 continue;
244
245 if (enable) {
246 tracing_start_cmdline_record();
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400247 set_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags);
Li Zefane870e9a2010-07-02 11:07:32 +0800248 } else {
249 tracing_stop_cmdline_record();
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400250 clear_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags);
Li Zefane870e9a2010-07-02 11:07:32 +0800251 }
Steven Rostedtae63b312012-05-03 23:09:03 -0400252 } while_for_each_event_file();
Li Zefane870e9a2010-07-02 11:07:32 +0800253 mutex_unlock(&event_mutex);
254}
255
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400256static int __ftrace_event_enable_disable(struct ftrace_event_file *file,
257 int enable, int soft_disable)
Steven Rostedtfd994982009-02-28 02:41:25 -0500258{
Steven Rostedtae63b312012-05-03 23:09:03 -0400259 struct ftrace_event_call *call = file->event_call;
Li Zefan3b8e4272009-12-08 11:14:52 +0800260 int ret = 0;
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400261 int disable;
Li Zefan3b8e4272009-12-08 11:14:52 +0800262
Steven Rostedtfd994982009-02-28 02:41:25 -0500263 switch (enable) {
264 case 0:
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400265 /*
Masami Hiramatsu1cf4c072013-05-09 14:44:29 +0900266 * When soft_disable is set and enable is cleared, the sm_ref
267 * reference counter is decremented. If it reaches 0, we want
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400268 * to clear the SOFT_DISABLED flag but leave the event in the
269 * state that it was. That is, if the event was enabled and
270 * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED
271 * is set we do not want the event to be enabled before we
272 * clear the bit.
273 *
274 * When soft_disable is not set but the SOFT_MODE flag is,
275 * we do nothing. Do not disable the tracepoint, otherwise
276 * "soft enable"s (clearing the SOFT_DISABLED bit) wont work.
277 */
278 if (soft_disable) {
Masami Hiramatsu1cf4c072013-05-09 14:44:29 +0900279 if (atomic_dec_return(&file->sm_ref) > 0)
280 break;
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400281 disable = file->flags & FTRACE_EVENT_FL_SOFT_DISABLED;
282 clear_bit(FTRACE_EVENT_FL_SOFT_MODE_BIT, &file->flags);
283 } else
284 disable = !(file->flags & FTRACE_EVENT_FL_SOFT_MODE);
285
286 if (disable && (file->flags & FTRACE_EVENT_FL_ENABLED)) {
287 clear_bit(FTRACE_EVENT_FL_ENABLED_BIT, &file->flags);
Steven Rostedtae63b312012-05-03 23:09:03 -0400288 if (file->flags & FTRACE_EVENT_FL_RECORDED_CMD) {
Li Zefane870e9a2010-07-02 11:07:32 +0800289 tracing_stop_cmdline_record();
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400290 clear_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags);
Li Zefane870e9a2010-07-02 11:07:32 +0800291 }
Steven Rostedtae63b312012-05-03 23:09:03 -0400292 call->class->reg(call, TRACE_REG_UNREGISTER, file);
Steven Rostedtfd994982009-02-28 02:41:25 -0500293 }
Tom Zanussi3baa5e42013-06-29 00:08:07 -0500294 /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT, else clear it */
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400295 if (file->flags & FTRACE_EVENT_FL_SOFT_MODE)
296 set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags);
Tom Zanussi3baa5e42013-06-29 00:08:07 -0500297 else
298 clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags);
Steven Rostedtfd994982009-02-28 02:41:25 -0500299 break;
300 case 1:
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400301 /*
302 * When soft_disable is set and enable is set, we want to
303 * register the tracepoint for the event, but leave the event
304 * as is. That means, if the event was already enabled, we do
305 * nothing (but set SOFT_MODE). If the event is disabled, we
306 * set SOFT_DISABLED before enabling the event tracepoint, so
307 * it still seems to be disabled.
308 */
309 if (!soft_disable)
310 clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags);
Masami Hiramatsu1cf4c072013-05-09 14:44:29 +0900311 else {
312 if (atomic_inc_return(&file->sm_ref) > 1)
313 break;
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400314 set_bit(FTRACE_EVENT_FL_SOFT_MODE_BIT, &file->flags);
Masami Hiramatsu1cf4c072013-05-09 14:44:29 +0900315 }
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400316
Steven Rostedtae63b312012-05-03 23:09:03 -0400317 if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) {
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400318
319 /* Keep the event disabled, when going to SOFT_MODE. */
320 if (soft_disable)
321 set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags);
322
Li Zefane870e9a2010-07-02 11:07:32 +0800323 if (trace_flags & TRACE_ITER_RECORD_CMD) {
324 tracing_start_cmdline_record();
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400325 set_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags);
Li Zefane870e9a2010-07-02 11:07:32 +0800326 }
Steven Rostedtae63b312012-05-03 23:09:03 -0400327 ret = call->class->reg(call, TRACE_REG_REGISTER, file);
Li Zefan3b8e4272009-12-08 11:14:52 +0800328 if (ret) {
329 tracing_stop_cmdline_record();
330 pr_info("event trace: Could not enable event "
331 "%s\n", call->name);
332 break;
333 }
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400334 set_bit(FTRACE_EVENT_FL_ENABLED_BIT, &file->flags);
Steven Rostedt (Red Hat)575380d2013-03-04 23:05:12 -0500335
336 /* WAS_ENABLED gets set but never cleared. */
337 call->flags |= TRACE_EVENT_FL_WAS_ENABLED;
Steven Rostedtfd994982009-02-28 02:41:25 -0500338 }
Steven Rostedtfd994982009-02-28 02:41:25 -0500339 break;
340 }
Li Zefan3b8e4272009-12-08 11:14:52 +0800341
342 return ret;
Steven Rostedtfd994982009-02-28 02:41:25 -0500343}
344
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400345static int ftrace_event_enable_disable(struct ftrace_event_file *file,
346 int enable)
347{
348 return __ftrace_event_enable_disable(file, enable, 0);
349}
350
Steven Rostedtae63b312012-05-03 23:09:03 -0400351static void ftrace_clear_events(struct trace_array *tr)
Zhaolei0e907c92009-05-25 18:13:59 +0800352{
Steven Rostedtae63b312012-05-03 23:09:03 -0400353 struct ftrace_event_file *file;
Zhaolei0e907c92009-05-25 18:13:59 +0800354
355 mutex_lock(&event_mutex);
Steven Rostedtae63b312012-05-03 23:09:03 -0400356 list_for_each_entry(file, &tr->events, list) {
357 ftrace_event_enable_disable(file, 0);
Zhaolei0e907c92009-05-25 18:13:59 +0800358 }
359 mutex_unlock(&event_mutex);
360}
361
Steven Rostedte9dbfae2011-07-05 11:36:06 -0400362static void __put_system(struct event_subsystem *system)
363{
364 struct event_filter *filter = system->filter;
365
Steven Rostedt6e94a782013-06-27 10:58:31 -0400366 WARN_ON_ONCE(system_refcount(system) == 0);
367 if (system_refcount_dec(system))
Steven Rostedte9dbfae2011-07-05 11:36:06 -0400368 return;
369
Steven Rostedtae63b312012-05-03 23:09:03 -0400370 list_del(&system->list);
371
Steven Rostedte9dbfae2011-07-05 11:36:06 -0400372 if (filter) {
373 kfree(filter->filter_string);
374 kfree(filter);
375 }
Steven Rostedt6e94a782013-06-27 10:58:31 -0400376 if (system->ref_count & SYSTEM_FL_FREE_NAME)
377 kfree(system->name);
Steven Rostedte9dbfae2011-07-05 11:36:06 -0400378 kfree(system);
379}
380
381static void __get_system(struct event_subsystem *system)
382{
Steven Rostedt6e94a782013-06-27 10:58:31 -0400383 WARN_ON_ONCE(system_refcount(system) == 0);
384 system_refcount_inc(system);
Steven Rostedte9dbfae2011-07-05 11:36:06 -0400385}
386
Steven Rostedtae63b312012-05-03 23:09:03 -0400387static void __get_system_dir(struct ftrace_subsystem_dir *dir)
388{
389 WARN_ON_ONCE(dir->ref_count == 0);
390 dir->ref_count++;
391 __get_system(dir->subsystem);
392}
393
394static void __put_system_dir(struct ftrace_subsystem_dir *dir)
395{
396 WARN_ON_ONCE(dir->ref_count == 0);
397 /* If the subsystem is about to be freed, the dir must be too */
Steven Rostedt6e94a782013-06-27 10:58:31 -0400398 WARN_ON_ONCE(system_refcount(dir->subsystem) == 1 && dir->ref_count != 1);
Steven Rostedtae63b312012-05-03 23:09:03 -0400399
400 __put_system(dir->subsystem);
401 if (!--dir->ref_count)
402 kfree(dir);
403}
404
405static void put_system(struct ftrace_subsystem_dir *dir)
Steven Rostedte9dbfae2011-07-05 11:36:06 -0400406{
407 mutex_lock(&event_mutex);
Steven Rostedtae63b312012-05-03 23:09:03 -0400408 __put_system_dir(dir);
Steven Rostedte9dbfae2011-07-05 11:36:06 -0400409 mutex_unlock(&event_mutex);
410}
411
Li Zefan8f31bfe2009-05-08 10:31:42 +0800412/*
413 * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events.
414 */
Steven Rostedtae63b312012-05-03 23:09:03 -0400415static int __ftrace_set_clr_event(struct trace_array *tr, const char *match,
416 const char *sub, const char *event, int set)
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500417{
Steven Rostedtae63b312012-05-03 23:09:03 -0400418 struct ftrace_event_file *file;
Steven Rostedta59fd602009-04-10 13:52:20 -0400419 struct ftrace_event_call *call;
Steven Rostedt29f93942009-05-08 16:06:47 -0400420 int ret = -EINVAL;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500421
Steven Rostedt11a241a2009-03-02 11:49:04 -0500422 mutex_lock(&event_mutex);
Steven Rostedtae63b312012-05-03 23:09:03 -0400423 list_for_each_entry(file, &tr->events, list) {
424
425 call = file->event_call;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500426
Steven Rostedta1d0ce82010-06-08 11:22:06 -0400427 if (!call->name || !call->class || !call->class->reg)
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500428 continue;
Steven Rostedt1473e442009-02-24 14:15:08 -0500429
Steven Rostedt9b637762012-05-10 15:55:43 -0400430 if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)
431 continue;
432
Steven Rostedtb628b3e2009-02-27 23:32:58 -0500433 if (match &&
434 strcmp(match, call->name) != 0 &&
Steven Rostedt8f082012010-04-20 10:47:33 -0400435 strcmp(match, call->class->system) != 0)
Steven Rostedtb628b3e2009-02-27 23:32:58 -0500436 continue;
437
Steven Rostedt8f082012010-04-20 10:47:33 -0400438 if (sub && strcmp(sub, call->class->system) != 0)
Steven Rostedtb628b3e2009-02-27 23:32:58 -0500439 continue;
440
441 if (event && strcmp(event, call->name) != 0)
Steven Rostedt1473e442009-02-24 14:15:08 -0500442 continue;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500443
Steven Rostedtae63b312012-05-03 23:09:03 -0400444 ftrace_event_enable_disable(file, set);
Steven Rostedtfd994982009-02-28 02:41:25 -0500445
Steven Rostedtb628b3e2009-02-27 23:32:58 -0500446 ret = 0;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500447 }
Steven Rostedt11a241a2009-03-02 11:49:04 -0500448 mutex_unlock(&event_mutex);
449
Steven Rostedtb628b3e2009-02-27 23:32:58 -0500450 return ret;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500451}
452
Steven Rostedtae63b312012-05-03 23:09:03 -0400453static int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set)
Li Zefan8f31bfe2009-05-08 10:31:42 +0800454{
455 char *event = NULL, *sub = NULL, *match;
456
457 /*
458 * The buf format can be <subsystem>:<event-name>
459 * *:<event-name> means any event by that name.
460 * :<event-name> is the same.
461 *
462 * <subsystem>:* means all events in that subsystem
463 * <subsystem>: means the same.
464 *
465 * <name> (no ':') means all events in a subsystem with
466 * the name <name> or any event that matches <name>
467 */
468
469 match = strsep(&buf, ":");
470 if (buf) {
471 sub = match;
472 event = buf;
473 match = NULL;
474
475 if (!strlen(sub) || strcmp(sub, "*") == 0)
476 sub = NULL;
477 if (!strlen(event) || strcmp(event, "*") == 0)
478 event = NULL;
479 }
480
Steven Rostedtae63b312012-05-03 23:09:03 -0400481 return __ftrace_set_clr_event(tr, match, sub, event, set);
Li Zefan8f31bfe2009-05-08 10:31:42 +0800482}
483
Steven Rostedt4671c792009-05-08 16:27:41 -0400484/**
485 * trace_set_clr_event - enable or disable an event
486 * @system: system name to match (NULL for any system)
487 * @event: event name to match (NULL for all events, within system)
488 * @set: 1 to enable, 0 to disable
489 *
490 * This is a way for other parts of the kernel to enable or disable
491 * event recording.
492 *
493 * Returns 0 on success, -EINVAL if the parameters do not match any
494 * registered events.
495 */
496int trace_set_clr_event(const char *system, const char *event, int set)
497{
Steven Rostedtae63b312012-05-03 23:09:03 -0400498 struct trace_array *tr = top_trace_array();
499
500 return __ftrace_set_clr_event(tr, NULL, system, event, set);
Steven Rostedt4671c792009-05-08 16:27:41 -0400501}
Yuanhan Liu56355b82010-11-08 14:05:12 +0800502EXPORT_SYMBOL_GPL(trace_set_clr_event);
Steven Rostedt4671c792009-05-08 16:27:41 -0400503
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500504/* 128 should be much more than enough */
505#define EVENT_BUF_SIZE 127
506
507static ssize_t
508ftrace_event_write(struct file *file, const char __user *ubuf,
509 size_t cnt, loff_t *ppos)
510{
jolsa@redhat.com48966362009-09-11 17:29:28 +0200511 struct trace_parser parser;
Steven Rostedtae63b312012-05-03 23:09:03 -0400512 struct seq_file *m = file->private_data;
513 struct trace_array *tr = m->private;
Li Zefan4ba79782009-09-22 13:52:20 +0800514 ssize_t read, ret;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500515
Li Zefan4ba79782009-09-22 13:52:20 +0800516 if (!cnt)
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500517 return 0;
518
Steven Rostedt1852fcc2009-03-11 14:33:00 -0400519 ret = tracing_update_buffers();
520 if (ret < 0)
521 return ret;
522
jolsa@redhat.com48966362009-09-11 17:29:28 +0200523 if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1))
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500524 return -ENOMEM;
525
jolsa@redhat.com48966362009-09-11 17:29:28 +0200526 read = trace_get_user(&parser, ubuf, cnt, ppos);
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500527
Li Zefan4ba79782009-09-22 13:52:20 +0800528 if (read >= 0 && trace_parser_loaded((&parser))) {
jolsa@redhat.com48966362009-09-11 17:29:28 +0200529 int set = 1;
530
531 if (*parser.buffer == '!')
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500532 set = 0;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500533
jolsa@redhat.com48966362009-09-11 17:29:28 +0200534 parser.buffer[parser.idx] = 0;
535
Steven Rostedtae63b312012-05-03 23:09:03 -0400536 ret = ftrace_set_clr_event(tr, parser.buffer + !set, set);
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500537 if (ret)
jolsa@redhat.com48966362009-09-11 17:29:28 +0200538 goto out_put;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500539 }
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500540
541 ret = read;
542
jolsa@redhat.com48966362009-09-11 17:29:28 +0200543 out_put:
544 trace_parser_put(&parser);
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500545
546 return ret;
547}
548
549static void *
550t_next(struct seq_file *m, void *v, loff_t *pos)
551{
Steven Rostedtae63b312012-05-03 23:09:03 -0400552 struct ftrace_event_file *file = v;
553 struct ftrace_event_call *call;
554 struct trace_array *tr = m->private;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500555
556 (*pos)++;
557
Steven Rostedtae63b312012-05-03 23:09:03 -0400558 list_for_each_entry_continue(file, &tr->events, list) {
559 call = file->event_call;
Steven Rostedt40e26812009-03-10 11:32:40 -0400560 /*
561 * The ftrace subsystem is for showing formats only.
562 * They can not be enabled or disabled via the event files.
563 */
Steven Rostedta1d0ce82010-06-08 11:22:06 -0400564 if (call->class && call->class->reg)
Steven Rostedtae63b312012-05-03 23:09:03 -0400565 return file;
Steven Rostedt40e26812009-03-10 11:32:40 -0400566 }
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500567
Li Zefan30bd39c2009-09-18 14:07:05 +0800568 return NULL;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500569}
570
571static void *t_start(struct seq_file *m, loff_t *pos)
572{
Steven Rostedtae63b312012-05-03 23:09:03 -0400573 struct ftrace_event_file *file;
574 struct trace_array *tr = m->private;
Li Zefane1c7e2a2009-06-24 09:52:29 +0800575 loff_t l;
576
Li Zefan20c89282009-05-06 10:33:45 +0800577 mutex_lock(&event_mutex);
Li Zefane1c7e2a2009-06-24 09:52:29 +0800578
Steven Rostedtae63b312012-05-03 23:09:03 -0400579 file = list_entry(&tr->events, struct ftrace_event_file, list);
Li Zefane1c7e2a2009-06-24 09:52:29 +0800580 for (l = 0; l <= *pos; ) {
Steven Rostedtae63b312012-05-03 23:09:03 -0400581 file = t_next(m, file, &l);
582 if (!file)
Li Zefane1c7e2a2009-06-24 09:52:29 +0800583 break;
584 }
Steven Rostedtae63b312012-05-03 23:09:03 -0400585 return file;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500586}
587
588static void *
589s_next(struct seq_file *m, void *v, loff_t *pos)
590{
Steven Rostedtae63b312012-05-03 23:09:03 -0400591 struct ftrace_event_file *file = v;
592 struct trace_array *tr = m->private;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500593
594 (*pos)++;
595
Steven Rostedtae63b312012-05-03 23:09:03 -0400596 list_for_each_entry_continue(file, &tr->events, list) {
597 if (file->flags & FTRACE_EVENT_FL_ENABLED)
598 return file;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500599 }
600
Li Zefan30bd39c2009-09-18 14:07:05 +0800601 return NULL;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500602}
603
604static void *s_start(struct seq_file *m, loff_t *pos)
605{
Steven Rostedtae63b312012-05-03 23:09:03 -0400606 struct ftrace_event_file *file;
607 struct trace_array *tr = m->private;
Li Zefane1c7e2a2009-06-24 09:52:29 +0800608 loff_t l;
609
Li Zefan20c89282009-05-06 10:33:45 +0800610 mutex_lock(&event_mutex);
Li Zefane1c7e2a2009-06-24 09:52:29 +0800611
Steven Rostedtae63b312012-05-03 23:09:03 -0400612 file = list_entry(&tr->events, struct ftrace_event_file, list);
Li Zefane1c7e2a2009-06-24 09:52:29 +0800613 for (l = 0; l <= *pos; ) {
Steven Rostedtae63b312012-05-03 23:09:03 -0400614 file = s_next(m, file, &l);
615 if (!file)
Li Zefane1c7e2a2009-06-24 09:52:29 +0800616 break;
617 }
Steven Rostedtae63b312012-05-03 23:09:03 -0400618 return file;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500619}
620
621static int t_show(struct seq_file *m, void *v)
622{
Steven Rostedtae63b312012-05-03 23:09:03 -0400623 struct ftrace_event_file *file = v;
624 struct ftrace_event_call *call = file->event_call;
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500625
Steven Rostedt8f082012010-04-20 10:47:33 -0400626 if (strcmp(call->class->system, TRACE_SYSTEM) != 0)
627 seq_printf(m, "%s:", call->class->system);
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500628 seq_printf(m, "%s\n", call->name);
629
630 return 0;
631}
632
633static void t_stop(struct seq_file *m, void *p)
634{
Li Zefan20c89282009-05-06 10:33:45 +0800635 mutex_unlock(&event_mutex);
Steven Rostedtb77e38a2009-02-24 10:21:36 -0500636}
637
Steven Rostedt1473e442009-02-24 14:15:08 -0500638static ssize_t
639event_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
640 loff_t *ppos)
641{
Steven Rostedtae63b312012-05-03 23:09:03 -0400642 struct ftrace_event_file *file = filp->private_data;
Tom Zanussia4390592013-06-29 00:08:04 -0500643 char buf[4] = "0";
Steven Rostedt1473e442009-02-24 14:15:08 -0500644
Tom Zanussia4390592013-06-29 00:08:04 -0500645 if (file->flags & FTRACE_EVENT_FL_ENABLED &&
646 !(file->flags & FTRACE_EVENT_FL_SOFT_DISABLED))
647 strcpy(buf, "1");
648
649 if (file->flags & FTRACE_EVENT_FL_SOFT_DISABLED ||
650 file->flags & FTRACE_EVENT_FL_SOFT_MODE)
651 strcat(buf, "*");
652
653 strcat(buf, "\n");
Steven Rostedt1473e442009-02-24 14:15:08 -0500654
Steven Rostedt (Red Hat)417944c2013-03-12 13:26:18 -0400655 return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf));
Steven Rostedt1473e442009-02-24 14:15:08 -0500656}
657
658static ssize_t
659event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
660 loff_t *ppos)
661{
Steven Rostedtae63b312012-05-03 23:09:03 -0400662 struct ftrace_event_file *file = filp->private_data;
Steven Rostedt1473e442009-02-24 14:15:08 -0500663 unsigned long val;
664 int ret;
665
Steven Rostedtae63b312012-05-03 23:09:03 -0400666 if (!file)
667 return -EINVAL;
668
Peter Huewe22fe9b52011-06-07 21:58:27 +0200669 ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
670 if (ret)
Steven Rostedt1473e442009-02-24 14:15:08 -0500671 return ret;
672
Steven Rostedt1852fcc2009-03-11 14:33:00 -0400673 ret = tracing_update_buffers();
674 if (ret < 0)
675 return ret;
676
Steven Rostedt1473e442009-02-24 14:15:08 -0500677 switch (val) {
678 case 0:
Steven Rostedt1473e442009-02-24 14:15:08 -0500679 case 1:
Steven Rostedt11a241a2009-03-02 11:49:04 -0500680 mutex_lock(&event_mutex);
Steven Rostedtae63b312012-05-03 23:09:03 -0400681 ret = ftrace_event_enable_disable(file, val);
Steven Rostedt11a241a2009-03-02 11:49:04 -0500682 mutex_unlock(&event_mutex);
Steven Rostedt1473e442009-02-24 14:15:08 -0500683 break;
684
685 default:
686 return -EINVAL;
687 }
688
689 *ppos += cnt;
690
Li Zefan3b8e4272009-12-08 11:14:52 +0800691 return ret ? ret : cnt;
Steven Rostedt1473e442009-02-24 14:15:08 -0500692}
693
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400694static ssize_t
695system_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
696 loff_t *ppos)
697{
Li Zefanc142b152009-05-08 10:32:05 +0800698 const char set_to_char[4] = { '?', '0', '1', 'X' };
Steven Rostedtae63b312012-05-03 23:09:03 -0400699 struct ftrace_subsystem_dir *dir = filp->private_data;
700 struct event_subsystem *system = dir->subsystem;
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400701 struct ftrace_event_call *call;
Steven Rostedtae63b312012-05-03 23:09:03 -0400702 struct ftrace_event_file *file;
703 struct trace_array *tr = dir->tr;
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400704 char buf[2];
Li Zefanc142b152009-05-08 10:32:05 +0800705 int set = 0;
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400706 int ret;
707
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400708 mutex_lock(&event_mutex);
Steven Rostedtae63b312012-05-03 23:09:03 -0400709 list_for_each_entry(file, &tr->events, list) {
710 call = file->event_call;
Steven Rostedta1d0ce82010-06-08 11:22:06 -0400711 if (!call->name || !call->class || !call->class->reg)
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400712 continue;
713
Steven Rostedt40ee4df2011-07-05 14:32:51 -0400714 if (system && strcmp(call->class->system, system->name) != 0)
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400715 continue;
716
717 /*
718 * We need to find out if all the events are set
719 * or if all events or cleared, or if we have
720 * a mixture.
721 */
Steven Rostedtae63b312012-05-03 23:09:03 -0400722 set |= (1 << !!(file->flags & FTRACE_EVENT_FL_ENABLED));
Li Zefanc142b152009-05-08 10:32:05 +0800723
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400724 /*
725 * If we have a mixture, no need to look further.
726 */
Li Zefanc142b152009-05-08 10:32:05 +0800727 if (set == 3)
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400728 break;
729 }
730 mutex_unlock(&event_mutex);
731
Li Zefanc142b152009-05-08 10:32:05 +0800732 buf[0] = set_to_char[set];
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400733 buf[1] = '\n';
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400734
735 ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2);
736
737 return ret;
738}
739
740static ssize_t
741system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
742 loff_t *ppos)
743{
Steven Rostedtae63b312012-05-03 23:09:03 -0400744 struct ftrace_subsystem_dir *dir = filp->private_data;
745 struct event_subsystem *system = dir->subsystem;
Steven Rostedt40ee4df2011-07-05 14:32:51 -0400746 const char *name = NULL;
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400747 unsigned long val;
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400748 ssize_t ret;
749
Peter Huewe22fe9b52011-06-07 21:58:27 +0200750 ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
751 if (ret)
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400752 return ret;
753
754 ret = tracing_update_buffers();
755 if (ret < 0)
756 return ret;
757
Li Zefan8f31bfe2009-05-08 10:31:42 +0800758 if (val != 0 && val != 1)
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400759 return -EINVAL;
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400760
Steven Rostedt40ee4df2011-07-05 14:32:51 -0400761 /*
762 * Opening of "enable" adds a ref count to system,
763 * so the name is safe to use.
764 */
765 if (system)
766 name = system->name;
767
Steven Rostedtae63b312012-05-03 23:09:03 -0400768 ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val);
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400769 if (ret)
Li Zefan8f31bfe2009-05-08 10:31:42 +0800770 goto out;
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400771
772 ret = cnt;
773
Li Zefan8f31bfe2009-05-08 10:31:42 +0800774out:
Steven Rostedt8ae79a12009-05-06 22:52:15 -0400775 *ppos += cnt;
776
777 return ret;
778}
779
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400780enum {
781 FORMAT_HEADER = 1,
Li Zefan86397dc2010-08-17 13:53:06 +0800782 FORMAT_FIELD_SEPERATOR = 2,
783 FORMAT_PRINTFMT = 3,
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400784};
785
786static void *f_next(struct seq_file *m, void *v, loff_t *pos)
Steven Rostedt981d0812009-03-02 13:53:59 -0500787{
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400788 struct ftrace_event_call *call = m->private;
Lai Jiangshan5a65e952009-12-15 15:39:53 +0800789 struct ftrace_event_field *field;
Li Zefan86397dc2010-08-17 13:53:06 +0800790 struct list_head *common_head = &ftrace_common_fields;
791 struct list_head *head = trace_get_fields(call);
Steven Rostedt981d0812009-03-02 13:53:59 -0500792
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400793 (*pos)++;
Lai Jiangshan5a65e952009-12-15 15:39:53 +0800794
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400795 switch ((unsigned long)v) {
796 case FORMAT_HEADER:
Li Zefan86397dc2010-08-17 13:53:06 +0800797 if (unlikely(list_empty(common_head)))
798 return NULL;
Lai Jiangshan5a65e952009-12-15 15:39:53 +0800799
Li Zefan86397dc2010-08-17 13:53:06 +0800800 field = list_entry(common_head->prev,
801 struct ftrace_event_field, link);
802 return field;
803
804 case FORMAT_FIELD_SEPERATOR:
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400805 if (unlikely(list_empty(head)))
806 return NULL;
Lai Jiangshan5a65e952009-12-15 15:39:53 +0800807
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400808 field = list_entry(head->prev, struct ftrace_event_field, link);
809 return field;
Lai Jiangshan5a65e952009-12-15 15:39:53 +0800810
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400811 case FORMAT_PRINTFMT:
812 /* all done */
813 return NULL;
Lai Jiangshan5a65e952009-12-15 15:39:53 +0800814 }
815
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400816 field = v;
Li Zefan86397dc2010-08-17 13:53:06 +0800817 if (field->link.prev == common_head)
818 return (void *)FORMAT_FIELD_SEPERATOR;
819 else if (field->link.prev == head)
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400820 return (void *)FORMAT_PRINTFMT;
821
822 field = list_entry(field->link.prev, struct ftrace_event_field, link);
823
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400824 return field;
Li Zefan8728fe52010-05-24 16:22:49 +0800825}
Lai Jiangshan5a65e952009-12-15 15:39:53 +0800826
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400827static void *f_start(struct seq_file *m, loff_t *pos)
Li Zefan8728fe52010-05-24 16:22:49 +0800828{
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400829 loff_t l = 0;
830 void *p;
Li Zefan8728fe52010-05-24 16:22:49 +0800831
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400832 /* Start by showing the header */
833 if (!*pos)
834 return (void *)FORMAT_HEADER;
835
836 p = (void *)FORMAT_HEADER;
837 do {
838 p = f_next(m, p, &l);
839 } while (p && l < *pos);
840
841 return p;
842}
843
844static int f_show(struct seq_file *m, void *v)
845{
846 struct ftrace_event_call *call = m->private;
847 struct ftrace_event_field *field;
848 const char *array_descriptor;
849
850 switch ((unsigned long)v) {
851 case FORMAT_HEADER:
852 seq_printf(m, "name: %s\n", call->name);
853 seq_printf(m, "ID: %d\n", call->event.type);
854 seq_printf(m, "format:\n");
Li Zefan8728fe52010-05-24 16:22:49 +0800855 return 0;
856
Li Zefan86397dc2010-08-17 13:53:06 +0800857 case FORMAT_FIELD_SEPERATOR:
858 seq_putc(m, '\n');
859 return 0;
860
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400861 case FORMAT_PRINTFMT:
862 seq_printf(m, "\nprint fmt: %s\n",
863 call->print_fmt);
864 return 0;
Steven Rostedt981d0812009-03-02 13:53:59 -0500865 }
866
Steven Rostedt2a37a3d2010-06-03 15:21:34 -0400867 field = v;
868
869 /*
870 * Smartly shows the array type(except dynamic array).
871 * Normal:
872 * field:TYPE VAR
873 * If TYPE := TYPE[LEN], it is shown:
874 * field:TYPE VAR[LEN]
875 */
876 array_descriptor = strchr(field->type, '[');
877
878 if (!strncmp(field->type, "__data_loc", 10))
879 array_descriptor = NULL;
880
881 if (!array_descriptor)
882 seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n",
883 field->type, field->name, field->offset,
884 field->size, !!field->is_signed);
885 else
886 seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n",
887 (int)(array_descriptor - field->type),
888 field->type, field->name,
889 array_descriptor, field->offset,
890 field->size, !!field->is_signed);
891
892 return 0;
893}
894
895static void f_stop(struct seq_file *m, void *p)
896{
897}
898
899static const struct seq_operations trace_format_seq_ops = {
900 .start = f_start,
901 .next = f_next,
902 .stop = f_stop,
903 .show = f_show,
904};
905
906static int trace_format_open(struct inode *inode, struct file *file)
907{
908 struct ftrace_event_call *call = inode->i_private;
909 struct seq_file *m;
910 int ret;
911
912 ret = seq_open(file, &trace_format_seq_ops);
913 if (ret < 0)
914 return ret;
915
916 m = file->private_data;
917 m->private = call;
918
919 return 0;
Steven Rostedt981d0812009-03-02 13:53:59 -0500920}
921
Peter Zijlstra23725ae2009-03-19 20:26:13 +0100922static ssize_t
923event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)
924{
925 struct ftrace_event_call *call = filp->private_data;
926 struct trace_seq *s;
927 int r;
928
929 if (*ppos)
930 return 0;
931
932 s = kmalloc(sizeof(*s), GFP_KERNEL);
933 if (!s)
934 return -ENOMEM;
935
936 trace_seq_init(s);
Steven Rostedt32c0eda2010-04-23 10:38:03 -0400937 trace_seq_printf(s, "%d\n", call->event.type);
Peter Zijlstra23725ae2009-03-19 20:26:13 +0100938
939 r = simple_read_from_buffer(ubuf, cnt, ppos,
940 s->buffer, s->len);
941 kfree(s);
942 return r;
943}
944
Tom Zanussi7ce7e422009-03-22 03:31:04 -0500945static ssize_t
946event_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
947 loff_t *ppos)
948{
949 struct ftrace_event_call *call = filp->private_data;
950 struct trace_seq *s;
951 int r;
952
953 if (*ppos)
954 return 0;
955
956 s = kmalloc(sizeof(*s), GFP_KERNEL);
957 if (!s)
958 return -ENOMEM;
959
960 trace_seq_init(s);
961
Tom Zanussi8b372562009-04-28 03:04:59 -0500962 print_event_filter(call, s);
Tom Zanussi4bda2d52009-03-24 02:14:31 -0500963 r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
Tom Zanussi7ce7e422009-03-22 03:31:04 -0500964
965 kfree(s);
966
967 return r;
968}
969
970static ssize_t
971event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
972 loff_t *ppos)
973{
974 struct ftrace_event_call *call = filp->private_data;
Tom Zanussi8b372562009-04-28 03:04:59 -0500975 char *buf;
Tom Zanussi7ce7e422009-03-22 03:31:04 -0500976 int err;
977
Tom Zanussi8b372562009-04-28 03:04:59 -0500978 if (cnt >= PAGE_SIZE)
Tom Zanussi7ce7e422009-03-22 03:31:04 -0500979 return -EINVAL;
980
Tom Zanussi8b372562009-04-28 03:04:59 -0500981 buf = (char *)__get_free_page(GFP_TEMPORARY);
982 if (!buf)
Tom Zanussi7ce7e422009-03-22 03:31:04 -0500983 return -ENOMEM;
984
Tom Zanussi8b372562009-04-28 03:04:59 -0500985 if (copy_from_user(buf, ubuf, cnt)) {
986 free_page((unsigned long) buf);
987 return -EFAULT;
988 }
989 buf[cnt] = '\0';
990
991 err = apply_event_filter(call, buf);
992 free_page((unsigned long) buf);
993 if (err < 0)
Tom Zanussi7ce7e422009-03-22 03:31:04 -0500994 return err;
Tom Zanussi0a19e532009-04-13 03:17:50 -0500995
Tom Zanussi7ce7e422009-03-22 03:31:04 -0500996 *ppos += cnt;
997
998 return cnt;
999}
1000
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001001static LIST_HEAD(event_subsystems);
1002
1003static int subsystem_open(struct inode *inode, struct file *filp)
1004{
1005 struct event_subsystem *system = NULL;
Steven Rostedtae63b312012-05-03 23:09:03 -04001006 struct ftrace_subsystem_dir *dir = NULL; /* Initialize for gcc */
1007 struct trace_array *tr;
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001008 int ret;
1009
1010 /* Make sure the system still exists */
1011 mutex_lock(&event_mutex);
Steven Rostedtae63b312012-05-03 23:09:03 -04001012 list_for_each_entry(tr, &ftrace_trace_arrays, list) {
1013 list_for_each_entry(dir, &tr->systems, list) {
1014 if (dir == inode->i_private) {
1015 /* Don't open systems with no events */
1016 if (dir->nr_events) {
1017 __get_system_dir(dir);
1018 system = dir->subsystem;
1019 }
1020 goto exit_loop;
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001021 }
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001022 }
1023 }
Steven Rostedtae63b312012-05-03 23:09:03 -04001024 exit_loop:
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001025 mutex_unlock(&event_mutex);
1026
Steven Rostedtae63b312012-05-03 23:09:03 -04001027 if (!system)
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001028 return -ENODEV;
1029
Steven Rostedtae63b312012-05-03 23:09:03 -04001030 /* Some versions of gcc think dir can be uninitialized here */
1031 WARN_ON(!dir);
1032
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001033 ret = tracing_open_generic(inode, filp);
Steven Rostedtae63b312012-05-03 23:09:03 -04001034 if (ret < 0)
1035 put_system(dir);
1036
1037 return ret;
1038}
1039
1040static int system_tr_open(struct inode *inode, struct file *filp)
1041{
1042 struct ftrace_subsystem_dir *dir;
1043 struct trace_array *tr = inode->i_private;
1044 int ret;
1045
1046 /* Make a temporary dir that has no system but points to tr */
1047 dir = kzalloc(sizeof(*dir), GFP_KERNEL);
1048 if (!dir)
1049 return -ENOMEM;
1050
1051 dir->tr = tr;
1052
1053 ret = tracing_open_generic(inode, filp);
1054 if (ret < 0)
1055 kfree(dir);
1056
1057 filp->private_data = dir;
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001058
1059 return ret;
1060}
1061
1062static int subsystem_release(struct inode *inode, struct file *file)
1063{
Steven Rostedtae63b312012-05-03 23:09:03 -04001064 struct ftrace_subsystem_dir *dir = file->private_data;
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001065
Steven Rostedtae63b312012-05-03 23:09:03 -04001066 /*
1067 * If dir->subsystem is NULL, then this is a temporary
1068 * descriptor that was made for a trace_array to enable
1069 * all subsystems.
1070 */
1071 if (dir->subsystem)
1072 put_system(dir);
1073 else
1074 kfree(dir);
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001075
1076 return 0;
1077}
1078
Tom Zanussicfb180f2009-03-22 03:31:17 -05001079static ssize_t
1080subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
1081 loff_t *ppos)
1082{
Steven Rostedtae63b312012-05-03 23:09:03 -04001083 struct ftrace_subsystem_dir *dir = filp->private_data;
1084 struct event_subsystem *system = dir->subsystem;
Tom Zanussicfb180f2009-03-22 03:31:17 -05001085 struct trace_seq *s;
1086 int r;
1087
1088 if (*ppos)
1089 return 0;
1090
1091 s = kmalloc(sizeof(*s), GFP_KERNEL);
1092 if (!s)
1093 return -ENOMEM;
1094
1095 trace_seq_init(s);
1096
Tom Zanussi8b372562009-04-28 03:04:59 -05001097 print_subsystem_event_filter(system, s);
Tom Zanussi4bda2d52009-03-24 02:14:31 -05001098 r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
Tom Zanussicfb180f2009-03-22 03:31:17 -05001099
1100 kfree(s);
1101
1102 return r;
1103}
1104
1105static ssize_t
1106subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
1107 loff_t *ppos)
1108{
Steven Rostedtae63b312012-05-03 23:09:03 -04001109 struct ftrace_subsystem_dir *dir = filp->private_data;
Tom Zanussi8b372562009-04-28 03:04:59 -05001110 char *buf;
Tom Zanussicfb180f2009-03-22 03:31:17 -05001111 int err;
1112
Tom Zanussi8b372562009-04-28 03:04:59 -05001113 if (cnt >= PAGE_SIZE)
Tom Zanussicfb180f2009-03-22 03:31:17 -05001114 return -EINVAL;
1115
Tom Zanussi8b372562009-04-28 03:04:59 -05001116 buf = (char *)__get_free_page(GFP_TEMPORARY);
1117 if (!buf)
Tom Zanussicfb180f2009-03-22 03:31:17 -05001118 return -ENOMEM;
1119
Tom Zanussi8b372562009-04-28 03:04:59 -05001120 if (copy_from_user(buf, ubuf, cnt)) {
1121 free_page((unsigned long) buf);
1122 return -EFAULT;
Tom Zanussicfb180f2009-03-22 03:31:17 -05001123 }
Tom Zanussi8b372562009-04-28 03:04:59 -05001124 buf[cnt] = '\0';
Tom Zanussicfb180f2009-03-22 03:31:17 -05001125
Steven Rostedtae63b312012-05-03 23:09:03 -04001126 err = apply_subsystem_event_filter(dir, buf);
Tom Zanussi8b372562009-04-28 03:04:59 -05001127 free_page((unsigned long) buf);
1128 if (err < 0)
Li Zefan44e9c8b2009-04-11 15:55:28 +08001129 return err;
Tom Zanussicfb180f2009-03-22 03:31:17 -05001130
1131 *ppos += cnt;
1132
1133 return cnt;
1134}
1135
Steven Rostedtd1b182a2009-04-15 16:53:47 -04001136static ssize_t
1137show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)
1138{
1139 int (*func)(struct trace_seq *s) = filp->private_data;
1140 struct trace_seq *s;
1141 int r;
1142
1143 if (*ppos)
1144 return 0;
1145
1146 s = kmalloc(sizeof(*s), GFP_KERNEL);
1147 if (!s)
1148 return -ENOMEM;
1149
1150 trace_seq_init(s);
1151
1152 func(s);
1153 r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
1154
1155 kfree(s);
1156
1157 return r;
1158}
1159
Steven Rostedt15075ca2012-05-03 14:57:28 -04001160static int ftrace_event_avail_open(struct inode *inode, struct file *file);
1161static int ftrace_event_set_open(struct inode *inode, struct file *file);
1162
Steven Rostedtb77e38a2009-02-24 10:21:36 -05001163static const struct seq_operations show_event_seq_ops = {
1164 .start = t_start,
1165 .next = t_next,
1166 .show = t_show,
1167 .stop = t_stop,
1168};
1169
1170static const struct seq_operations show_set_event_seq_ops = {
1171 .start = s_start,
1172 .next = s_next,
1173 .show = t_show,
1174 .stop = t_stop,
1175};
1176
Steven Rostedt2314c4a2009-03-10 12:04:02 -04001177static const struct file_operations ftrace_avail_fops = {
Steven Rostedt15075ca2012-05-03 14:57:28 -04001178 .open = ftrace_event_avail_open,
Steven Rostedt2314c4a2009-03-10 12:04:02 -04001179 .read = seq_read,
1180 .llseek = seq_lseek,
1181 .release = seq_release,
1182};
1183
Steven Rostedtb77e38a2009-02-24 10:21:36 -05001184static const struct file_operations ftrace_set_event_fops = {
Steven Rostedt15075ca2012-05-03 14:57:28 -04001185 .open = ftrace_event_set_open,
Steven Rostedtb77e38a2009-02-24 10:21:36 -05001186 .read = seq_read,
1187 .write = ftrace_event_write,
1188 .llseek = seq_lseek,
1189 .release = seq_release,
1190};
1191
Steven Rostedt1473e442009-02-24 14:15:08 -05001192static const struct file_operations ftrace_enable_fops = {
1193 .open = tracing_open_generic,
1194 .read = event_enable_read,
1195 .write = event_enable_write,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001196 .llseek = default_llseek,
Steven Rostedt1473e442009-02-24 14:15:08 -05001197};
1198
Steven Rostedt981d0812009-03-02 13:53:59 -05001199static const struct file_operations ftrace_event_format_fops = {
Steven Rostedt2a37a3d2010-06-03 15:21:34 -04001200 .open = trace_format_open,
1201 .read = seq_read,
1202 .llseek = seq_lseek,
1203 .release = seq_release,
Steven Rostedt981d0812009-03-02 13:53:59 -05001204};
1205
Peter Zijlstra23725ae2009-03-19 20:26:13 +01001206static const struct file_operations ftrace_event_id_fops = {
1207 .open = tracing_open_generic,
1208 .read = event_id_read,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001209 .llseek = default_llseek,
Peter Zijlstra23725ae2009-03-19 20:26:13 +01001210};
1211
Tom Zanussi7ce7e422009-03-22 03:31:04 -05001212static const struct file_operations ftrace_event_filter_fops = {
1213 .open = tracing_open_generic,
1214 .read = event_filter_read,
1215 .write = event_filter_write,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001216 .llseek = default_llseek,
Tom Zanussi7ce7e422009-03-22 03:31:04 -05001217};
1218
Tom Zanussicfb180f2009-03-22 03:31:17 -05001219static const struct file_operations ftrace_subsystem_filter_fops = {
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001220 .open = subsystem_open,
Tom Zanussicfb180f2009-03-22 03:31:17 -05001221 .read = subsystem_filter_read,
1222 .write = subsystem_filter_write,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001223 .llseek = default_llseek,
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001224 .release = subsystem_release,
Tom Zanussicfb180f2009-03-22 03:31:17 -05001225};
1226
Steven Rostedt8ae79a12009-05-06 22:52:15 -04001227static const struct file_operations ftrace_system_enable_fops = {
Steven Rostedt40ee4df2011-07-05 14:32:51 -04001228 .open = subsystem_open,
Steven Rostedt8ae79a12009-05-06 22:52:15 -04001229 .read = system_enable_read,
1230 .write = system_enable_write,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001231 .llseek = default_llseek,
Steven Rostedt40ee4df2011-07-05 14:32:51 -04001232 .release = subsystem_release,
Steven Rostedt8ae79a12009-05-06 22:52:15 -04001233};
1234
Steven Rostedtae63b312012-05-03 23:09:03 -04001235static const struct file_operations ftrace_tr_enable_fops = {
1236 .open = system_tr_open,
1237 .read = system_enable_read,
1238 .write = system_enable_write,
1239 .llseek = default_llseek,
1240 .release = subsystem_release,
1241};
1242
Steven Rostedtd1b182a2009-04-15 16:53:47 -04001243static const struct file_operations ftrace_show_header_fops = {
1244 .open = tracing_open_generic,
1245 .read = show_header,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001246 .llseek = default_llseek,
Steven Rostedtd1b182a2009-04-15 16:53:47 -04001247};
1248
Steven Rostedtae63b312012-05-03 23:09:03 -04001249static int
1250ftrace_event_open(struct inode *inode, struct file *file,
1251 const struct seq_operations *seq_ops)
Steven Rostedt1473e442009-02-24 14:15:08 -05001252{
Steven Rostedtae63b312012-05-03 23:09:03 -04001253 struct seq_file *m;
1254 int ret;
Steven Rostedt1473e442009-02-24 14:15:08 -05001255
Steven Rostedtae63b312012-05-03 23:09:03 -04001256 ret = seq_open(file, seq_ops);
1257 if (ret < 0)
1258 return ret;
1259 m = file->private_data;
1260 /* copy tr over to seq ops */
1261 m->private = inode->i_private;
Steven Rostedt1473e442009-02-24 14:15:08 -05001262
Steven Rostedtae63b312012-05-03 23:09:03 -04001263 return ret;
Steven Rostedt1473e442009-02-24 14:15:08 -05001264}
1265
Steven Rostedt15075ca2012-05-03 14:57:28 -04001266static int
1267ftrace_event_avail_open(struct inode *inode, struct file *file)
1268{
1269 const struct seq_operations *seq_ops = &show_event_seq_ops;
1270
Steven Rostedtae63b312012-05-03 23:09:03 -04001271 return ftrace_event_open(inode, file, seq_ops);
Steven Rostedt15075ca2012-05-03 14:57:28 -04001272}
1273
1274static int
1275ftrace_event_set_open(struct inode *inode, struct file *file)
1276{
1277 const struct seq_operations *seq_ops = &show_set_event_seq_ops;
Steven Rostedtae63b312012-05-03 23:09:03 -04001278 struct trace_array *tr = inode->i_private;
Steven Rostedt15075ca2012-05-03 14:57:28 -04001279
1280 if ((file->f_mode & FMODE_WRITE) &&
1281 (file->f_flags & O_TRUNC))
Steven Rostedtae63b312012-05-03 23:09:03 -04001282 ftrace_clear_events(tr);
Steven Rostedt15075ca2012-05-03 14:57:28 -04001283
Steven Rostedtae63b312012-05-03 23:09:03 -04001284 return ftrace_event_open(inode, file, seq_ops);
Steven Rostedt15075ca2012-05-03 14:57:28 -04001285}
1286
Steven Rostedtae63b312012-05-03 23:09:03 -04001287static struct event_subsystem *
1288create_new_subsystem(const char *name)
Steven Rostedt6ecc2d12009-02-27 21:33:02 -05001289{
1290 struct event_subsystem *system;
Steven Rostedt6ecc2d12009-02-27 21:33:02 -05001291
1292 /* need to create new entry */
1293 system = kmalloc(sizeof(*system), GFP_KERNEL);
Steven Rostedtae63b312012-05-03 23:09:03 -04001294 if (!system)
1295 return NULL;
Steven Rostedt6ecc2d12009-02-27 21:33:02 -05001296
Steven Rostedte9dbfae2011-07-05 11:36:06 -04001297 system->ref_count = 1;
Steven Rostedt6e94a782013-06-27 10:58:31 -04001298
1299 /* Only allocate if dynamic (kprobes and modules) */
1300 if (!core_kernel_data((unsigned long)name)) {
1301 system->ref_count |= SYSTEM_FL_FREE_NAME;
1302 system->name = kstrdup(name, GFP_KERNEL);
1303 if (!system->name)
1304 goto out_free;
1305 } else
1306 system->name = name;
Steven Rostedt6ecc2d12009-02-27 21:33:02 -05001307
Tom Zanussi30e673b2009-04-28 03:04:47 -05001308 system->filter = NULL;
Tom Zanussicfb180f2009-03-22 03:31:17 -05001309
Tom Zanussi8b372562009-04-28 03:04:59 -05001310 system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL);
Steven Rostedtae63b312012-05-03 23:09:03 -04001311 if (!system->filter)
1312 goto out_free;
1313
1314 list_add(&system->list, &event_subsystems);
1315
1316 return system;
1317
1318 out_free:
Steven Rostedt6e94a782013-06-27 10:58:31 -04001319 if (system->ref_count & SYSTEM_FL_FREE_NAME)
1320 kfree(system->name);
Steven Rostedtae63b312012-05-03 23:09:03 -04001321 kfree(system);
1322 return NULL;
1323}
1324
1325static struct dentry *
1326event_subsystem_dir(struct trace_array *tr, const char *name,
1327 struct ftrace_event_file *file, struct dentry *parent)
1328{
1329 struct ftrace_subsystem_dir *dir;
1330 struct event_subsystem *system;
1331 struct dentry *entry;
1332
1333 /* First see if we did not already create this dir */
1334 list_for_each_entry(dir, &tr->systems, list) {
1335 system = dir->subsystem;
1336 if (strcmp(system->name, name) == 0) {
1337 dir->nr_events++;
1338 file->system = dir;
1339 return dir->entry;
1340 }
Tom Zanussi8b372562009-04-28 03:04:59 -05001341 }
1342
Steven Rostedtae63b312012-05-03 23:09:03 -04001343 /* Now see if the system itself exists. */
1344 list_for_each_entry(system, &event_subsystems, list) {
1345 if (strcmp(system->name, name) == 0)
1346 break;
1347 }
1348 /* Reset system variable when not found */
1349 if (&system->list == &event_subsystems)
1350 system = NULL;
1351
1352 dir = kmalloc(sizeof(*dir), GFP_KERNEL);
1353 if (!dir)
1354 goto out_fail;
1355
1356 if (!system) {
1357 system = create_new_subsystem(name);
1358 if (!system)
1359 goto out_free;
1360 } else
1361 __get_system(system);
1362
1363 dir->entry = debugfs_create_dir(name, parent);
1364 if (!dir->entry) {
1365 pr_warning("Failed to create system directory %s\n", name);
1366 __put_system(system);
1367 goto out_free;
1368 }
1369
1370 dir->tr = tr;
1371 dir->ref_count = 1;
1372 dir->nr_events = 1;
1373 dir->subsystem = system;
1374 file->system = dir;
1375
1376 entry = debugfs_create_file("filter", 0644, dir->entry, dir,
Tom Zanussie1112b42009-03-31 00:48:49 -05001377 &ftrace_subsystem_filter_fops);
Tom Zanussi8b372562009-04-28 03:04:59 -05001378 if (!entry) {
1379 kfree(system->filter);
1380 system->filter = NULL;
Steven Rostedtae63b312012-05-03 23:09:03 -04001381 pr_warning("Could not create debugfs '%s/filter' entry\n", name);
Tom Zanussi8b372562009-04-28 03:04:59 -05001382 }
Tom Zanussie1112b42009-03-31 00:48:49 -05001383
Steven Rostedtae63b312012-05-03 23:09:03 -04001384 trace_create_file("enable", 0644, dir->entry, dir,
Frederic Weisbeckerf3f3f002009-09-24 15:27:41 +02001385 &ftrace_system_enable_fops);
Steven Rostedt8ae79a12009-05-06 22:52:15 -04001386
Steven Rostedtae63b312012-05-03 23:09:03 -04001387 list_add(&dir->list, &tr->systems);
1388
1389 return dir->entry;
1390
1391 out_free:
1392 kfree(dir);
1393 out_fail:
1394 /* Only print this message if failed on memory allocation */
1395 if (!dir || !system)
1396 pr_warning("No memory to create event subsystem %s\n",
1397 name);
1398 return NULL;
Steven Rostedt6ecc2d12009-02-27 21:33:02 -05001399}
1400
Steven Rostedt1473e442009-02-24 14:15:08 -05001401static int
Steven Rostedtae63b312012-05-03 23:09:03 -04001402event_create_dir(struct dentry *parent,
1403 struct ftrace_event_file *file,
Steven Rostedt701970b2009-04-24 23:11:22 -04001404 const struct file_operations *id,
1405 const struct file_operations *enable,
1406 const struct file_operations *filter,
1407 const struct file_operations *format)
Steven Rostedt1473e442009-02-24 14:15:08 -05001408{
Steven Rostedtae63b312012-05-03 23:09:03 -04001409 struct ftrace_event_call *call = file->event_call;
1410 struct trace_array *tr = file->tr;
Steven Rostedt2e33af02010-04-22 10:35:55 -04001411 struct list_head *head;
Steven Rostedtae63b312012-05-03 23:09:03 -04001412 struct dentry *d_events;
Steven Rostedtfd994982009-02-28 02:41:25 -05001413 int ret;
Steven Rostedt1473e442009-02-24 14:15:08 -05001414
Steven Rostedt6ecc2d12009-02-27 21:33:02 -05001415 /*
1416 * If the trace point header did not define TRACE_SYSTEM
1417 * then the system would be called "TRACE_SYSTEM".
1418 */
Steven Rostedtae63b312012-05-03 23:09:03 -04001419 if (strcmp(call->class->system, TRACE_SYSTEM) != 0) {
1420 d_events = event_subsystem_dir(tr, call->class->system, file, parent);
1421 if (!d_events)
1422 return -ENOMEM;
1423 } else
1424 d_events = parent;
Steven Rostedt6ecc2d12009-02-27 21:33:02 -05001425
Steven Rostedtae63b312012-05-03 23:09:03 -04001426 file->dir = debugfs_create_dir(call->name, d_events);
1427 if (!file->dir) {
1428 pr_warning("Could not create debugfs '%s' directory\n",
1429 call->name);
Steven Rostedt1473e442009-02-24 14:15:08 -05001430 return -1;
1431 }
1432
Steven Rostedt9b637762012-05-10 15:55:43 -04001433 if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE))
Steven Rostedtae63b312012-05-03 23:09:03 -04001434 trace_create_file("enable", 0644, file->dir, file,
Frederic Weisbeckerf3f3f002009-09-24 15:27:41 +02001435 enable);
Steven Rostedt1473e442009-02-24 14:15:08 -05001436
Steven Rostedt22392912010-04-21 12:27:06 -04001437#ifdef CONFIG_PERF_EVENTS
Steven Rostedta1d0ce82010-06-08 11:22:06 -04001438 if (call->event.type && call->class->reg)
Steven Rostedtae63b312012-05-03 23:09:03 -04001439 trace_create_file("id", 0444, file->dir, call,
Frederic Weisbeckerf3f3f002009-09-24 15:27:41 +02001440 id);
Steven Rostedt22392912010-04-21 12:27:06 -04001441#endif
Peter Zijlstra23725ae2009-03-19 20:26:13 +01001442
Li Zefanc9d932c2010-05-24 16:24:28 +08001443 /*
1444 * Other events may have the same class. Only update
1445 * the fields if they are not already defined.
1446 */
1447 head = trace_get_fields(call);
1448 if (list_empty(head)) {
1449 ret = call->class->define_fields(call);
1450 if (ret < 0) {
1451 pr_warning("Could not initialize trace point"
1452 " events/%s\n", call->name);
Steven Rostedtae63b312012-05-03 23:09:03 -04001453 return -1;
Tom Zanussicf027f62009-03-22 03:30:39 -05001454 }
1455 }
Steven Rostedtae63b312012-05-03 23:09:03 -04001456 trace_create_file("filter", 0644, file->dir, call,
Li Zefanc9d932c2010-05-24 16:24:28 +08001457 filter);
Tom Zanussicf027f62009-03-22 03:30:39 -05001458
Steven Rostedtae63b312012-05-03 23:09:03 -04001459 trace_create_file("format", 0444, file->dir, call,
Frederic Weisbeckerf3f3f002009-09-24 15:27:41 +02001460 format);
Steven Rostedtfd994982009-02-28 02:41:25 -05001461
Steven Rostedt1473e442009-02-24 14:15:08 -05001462 return 0;
1463}
1464
Steven Rostedtae63b312012-05-03 23:09:03 -04001465static void remove_subsystem(struct ftrace_subsystem_dir *dir)
1466{
1467 if (!dir)
1468 return;
1469
1470 if (!--dir->nr_events) {
1471 debugfs_remove_recursive(dir->entry);
1472 list_del(&dir->list);
1473 __put_system_dir(dir);
1474 }
1475}
1476
1477static void remove_event_from_tracers(struct ftrace_event_call *call)
1478{
1479 struct ftrace_event_file *file;
1480 struct trace_array *tr;
1481
1482 do_for_each_event_file_safe(tr, file) {
1483
1484 if (file->event_call != call)
1485 continue;
1486
1487 list_del(&file->list);
1488 debugfs_remove_recursive(file->dir);
1489 remove_subsystem(file->system);
Steven Rostedtd1a29142013-02-27 20:23:57 -05001490 kmem_cache_free(file_cachep, file);
Steven Rostedtae63b312012-05-03 23:09:03 -04001491
1492 /*
1493 * The do_for_each_event_file_safe() is
1494 * a double loop. After finding the call for this
1495 * trace_array, we use break to jump to the next
1496 * trace_array.
1497 */
1498 break;
1499 } while_for_each_event_file();
1500}
1501
Ezequiel Garcia87819152012-09-12 11:47:57 -03001502static void event_remove(struct ftrace_event_call *call)
1503{
Steven Rostedtae63b312012-05-03 23:09:03 -04001504 struct trace_array *tr;
1505 struct ftrace_event_file *file;
1506
1507 do_for_each_event_file(tr, file) {
1508 if (file->event_call != call)
1509 continue;
1510 ftrace_event_enable_disable(file, 0);
1511 /*
1512 * The do_for_each_event_file() is
1513 * a double loop. After finding the call for this
1514 * trace_array, we use break to jump to the next
1515 * trace_array.
1516 */
1517 break;
1518 } while_for_each_event_file();
1519
Ezequiel Garcia87819152012-09-12 11:47:57 -03001520 if (call->event.funcs)
1521 __unregister_ftrace_event(&call->event);
Steven Rostedtae63b312012-05-03 23:09:03 -04001522 remove_event_from_tracers(call);
Ezequiel Garcia87819152012-09-12 11:47:57 -03001523 list_del(&call->list);
1524}
1525
1526static int event_init(struct ftrace_event_call *call)
1527{
1528 int ret = 0;
1529
1530 if (WARN_ON(!call->name))
1531 return -EINVAL;
1532
1533 if (call->class->raw_init) {
1534 ret = call->class->raw_init(call);
1535 if (ret < 0 && ret != -ENOSYS)
1536 pr_warn("Could not initialize trace events/%s\n",
1537 call->name);
1538 }
1539
1540 return ret;
1541}
1542
Li Zefan67ead0a2010-05-24 16:25:13 +08001543static int
Steven Rostedtae63b312012-05-03 23:09:03 -04001544__register_event(struct ftrace_event_call *call, struct module *mod)
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001545{
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001546 int ret;
Steven Rostedt6d723732009-04-10 14:53:50 -04001547
Ezequiel Garcia87819152012-09-12 11:47:57 -03001548 ret = event_init(call);
1549 if (ret < 0)
1550 return ret;
Steven Rostedt701970b2009-04-24 23:11:22 -04001551
Steven Rostedtae63b312012-05-03 23:09:03 -04001552 list_add(&call->list, &ftrace_events);
Li Zefan67ead0a2010-05-24 16:25:13 +08001553 call->mod = mod;
Masami Hiramatsu88f70d72009-09-25 11:20:54 -07001554
Steven Rostedtae63b312012-05-03 23:09:03 -04001555 return 0;
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001556}
1557
Steven Rostedt (Red Hat)da511bf2013-05-09 15:00:07 -04001558static struct ftrace_event_file *
1559trace_create_new_event(struct ftrace_event_call *call,
1560 struct trace_array *tr)
1561{
1562 struct ftrace_event_file *file;
1563
1564 file = kmem_cache_alloc(file_cachep, GFP_TRACE);
1565 if (!file)
1566 return NULL;
1567
1568 file->event_call = call;
1569 file->tr = tr;
1570 atomic_set(&file->sm_ref, 0);
1571 list_add(&file->list, &tr->events);
1572
1573 return file;
1574}
1575
Steven Rostedtae63b312012-05-03 23:09:03 -04001576/* Add an event to a trace directory */
1577static int
1578__trace_add_new_event(struct ftrace_event_call *call,
1579 struct trace_array *tr,
1580 const struct file_operations *id,
1581 const struct file_operations *enable,
1582 const struct file_operations *filter,
1583 const struct file_operations *format)
1584{
1585 struct ftrace_event_file *file;
1586
Steven Rostedt (Red Hat)da511bf2013-05-09 15:00:07 -04001587 file = trace_create_new_event(call, tr);
Steven Rostedtae63b312012-05-03 23:09:03 -04001588 if (!file)
1589 return -ENOMEM;
1590
Steven Rostedtae63b312012-05-03 23:09:03 -04001591 return event_create_dir(tr->event_dir, file, id, enable, filter, format);
1592}
1593
Steven Rostedt77248222013-02-27 16:28:06 -05001594/*
1595 * Just create a decriptor for early init. A descriptor is required
1596 * for enabling events at boot. We want to enable events before
1597 * the filesystem is initialized.
1598 */
1599static __init int
1600__trace_early_add_new_event(struct ftrace_event_call *call,
1601 struct trace_array *tr)
1602{
1603 struct ftrace_event_file *file;
1604
Steven Rostedt (Red Hat)da511bf2013-05-09 15:00:07 -04001605 file = trace_create_new_event(call, tr);
Steven Rostedt77248222013-02-27 16:28:06 -05001606 if (!file)
1607 return -ENOMEM;
1608
Steven Rostedt77248222013-02-27 16:28:06 -05001609 return 0;
1610}
1611
Steven Rostedtae63b312012-05-03 23:09:03 -04001612struct ftrace_module_file_ops;
1613static void __add_event_to_tracers(struct ftrace_event_call *call,
1614 struct ftrace_module_file_ops *file_ops);
1615
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001616/* Add an additional event_call dynamically */
1617int trace_add_event_call(struct ftrace_event_call *call)
1618{
1619 int ret;
1620 mutex_lock(&event_mutex);
Steven Rostedtae63b312012-05-03 23:09:03 -04001621
1622 ret = __register_event(call, NULL);
1623 if (ret >= 0)
1624 __add_event_to_tracers(call, NULL);
1625
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001626 mutex_unlock(&event_mutex);
1627 return ret;
1628}
Steven Rostedt701970b2009-04-24 23:11:22 -04001629
Masami Hiramatsu4fead8e2009-09-14 16:49:12 -04001630/*
zhangwei(Jovi)52f6ad62013-03-11 15:14:03 +08001631 * Must be called under locking both of event_mutex and trace_event_sem.
Masami Hiramatsu4fead8e2009-09-14 16:49:12 -04001632 */
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001633static void __trace_remove_event_call(struct ftrace_event_call *call)
1634{
Ezequiel Garcia87819152012-09-12 11:47:57 -03001635 event_remove(call);
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001636 trace_destroy_fields(call);
1637 destroy_preds(call);
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001638}
1639
1640/* Remove an event_call */
1641void trace_remove_event_call(struct ftrace_event_call *call)
1642{
1643 mutex_lock(&event_mutex);
zhangwei(Jovi)52f6ad62013-03-11 15:14:03 +08001644 down_write(&trace_event_sem);
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001645 __trace_remove_event_call(call);
zhangwei(Jovi)52f6ad62013-03-11 15:14:03 +08001646 up_write(&trace_event_sem);
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001647 mutex_unlock(&event_mutex);
1648}
1649
1650#define for_each_event(event, start, end) \
1651 for (event = start; \
1652 (unsigned long)event < (unsigned long)end; \
1653 event++)
1654
1655#ifdef CONFIG_MODULES
1656
1657static LIST_HEAD(ftrace_module_file_list);
1658
1659/*
1660 * Modules must own their file_operations to keep up with
1661 * reference counting.
1662 */
1663struct ftrace_module_file_ops {
1664 struct list_head list;
1665 struct module *mod;
1666 struct file_operations id;
1667 struct file_operations enable;
1668 struct file_operations format;
1669 struct file_operations filter;
1670};
1671
Steven Rostedt (Red Hat)315326c2013-03-02 17:37:14 -05001672static struct ftrace_module_file_ops *
1673find_ftrace_file_ops(struct ftrace_module_file_ops *file_ops, struct module *mod)
Steven Rostedtae63b312012-05-03 23:09:03 -04001674{
Steven Rostedt (Red Hat)315326c2013-03-02 17:37:14 -05001675 /*
1676 * As event_calls are added in groups by module,
1677 * when we find one file_ops, we don't need to search for
1678 * each call in that module, as the rest should be the
1679 * same. Only search for a new one if the last one did
1680 * not match.
1681 */
1682 if (file_ops && mod == file_ops->mod)
1683 return file_ops;
Steven Rostedtae63b312012-05-03 23:09:03 -04001684
1685 list_for_each_entry(file_ops, &ftrace_module_file_list, list) {
1686 if (file_ops->mod == mod)
1687 return file_ops;
1688 }
1689 return NULL;
1690}
1691
Steven Rostedt701970b2009-04-24 23:11:22 -04001692static struct ftrace_module_file_ops *
1693trace_create_file_ops(struct module *mod)
1694{
1695 struct ftrace_module_file_ops *file_ops;
1696
1697 /*
1698 * This is a bit of a PITA. To allow for correct reference
1699 * counting, modules must "own" their file_operations.
1700 * To do this, we allocate the file operations that will be
1701 * used in the event directory.
1702 */
1703
1704 file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL);
1705 if (!file_ops)
1706 return NULL;
1707
1708 file_ops->mod = mod;
1709
1710 file_ops->id = ftrace_event_id_fops;
1711 file_ops->id.owner = mod;
1712
1713 file_ops->enable = ftrace_enable_fops;
1714 file_ops->enable.owner = mod;
1715
1716 file_ops->filter = ftrace_event_filter_fops;
1717 file_ops->filter.owner = mod;
1718
1719 file_ops->format = ftrace_event_format_fops;
1720 file_ops->format.owner = mod;
1721
1722 list_add(&file_ops->list, &ftrace_module_file_list);
1723
1724 return file_ops;
1725}
1726
Steven Rostedt6d723732009-04-10 14:53:50 -04001727static void trace_module_add_events(struct module *mod)
1728{
Steven Rostedt701970b2009-04-24 23:11:22 -04001729 struct ftrace_module_file_ops *file_ops = NULL;
Steven Rostedte4a9ea52011-01-27 09:15:30 -05001730 struct ftrace_event_call **call, **start, **end;
Steven Rostedt6d723732009-04-10 14:53:50 -04001731
1732 start = mod->trace_events;
1733 end = mod->trace_events + mod->num_trace_events;
1734
1735 if (start == end)
1736 return;
1737
Li Zefan67ead0a2010-05-24 16:25:13 +08001738 file_ops = trace_create_file_ops(mod);
1739 if (!file_ops)
Steven Rostedt6d723732009-04-10 14:53:50 -04001740 return;
1741
1742 for_each_event(call, start, end) {
Steven Rostedtae63b312012-05-03 23:09:03 -04001743 __register_event(*call, mod);
1744 __add_event_to_tracers(*call, file_ops);
Steven Rostedt6d723732009-04-10 14:53:50 -04001745 }
1746}
1747
1748static void trace_module_remove_events(struct module *mod)
1749{
Steven Rostedt701970b2009-04-24 23:11:22 -04001750 struct ftrace_module_file_ops *file_ops;
Steven Rostedt6d723732009-04-10 14:53:50 -04001751 struct ftrace_event_call *call, *p;
Steven Rostedt (Red Hat)575380d2013-03-04 23:05:12 -05001752 bool clear_trace = false;
Steven Rostedt6d723732009-04-10 14:53:50 -04001753
zhangwei(Jovi)52f6ad62013-03-11 15:14:03 +08001754 down_write(&trace_event_sem);
Steven Rostedt6d723732009-04-10 14:53:50 -04001755 list_for_each_entry_safe(call, p, &ftrace_events, list) {
1756 if (call->mod == mod) {
Steven Rostedt (Red Hat)575380d2013-03-04 23:05:12 -05001757 if (call->flags & TRACE_EVENT_FL_WAS_ENABLED)
1758 clear_trace = true;
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -04001759 __trace_remove_event_call(call);
Steven Rostedt6d723732009-04-10 14:53:50 -04001760 }
1761 }
Steven Rostedt701970b2009-04-24 23:11:22 -04001762
1763 /* Now free the file_operations */
1764 list_for_each_entry(file_ops, &ftrace_module_file_list, list) {
1765 if (file_ops->mod == mod)
1766 break;
1767 }
1768 if (&file_ops->list != &ftrace_module_file_list) {
1769 list_del(&file_ops->list);
1770 kfree(file_ops);
1771 }
zhangwei(Jovi)52f6ad62013-03-11 15:14:03 +08001772 up_write(&trace_event_sem);
Steven Rostedt9456f0f2009-05-06 21:54:09 -04001773
1774 /*
1775 * It is safest to reset the ring buffer if the module being unloaded
Steven Rostedt (Red Hat)873c6422013-03-04 23:26:06 -05001776 * registered any events that were used. The only worry is if
1777 * a new module gets loaded, and takes on the same id as the events
1778 * of this module. When printing out the buffer, traced events left
1779 * over from this module may be passed to the new module events and
1780 * unexpected results may occur.
Steven Rostedt9456f0f2009-05-06 21:54:09 -04001781 */
Steven Rostedt (Red Hat)575380d2013-03-04 23:05:12 -05001782 if (clear_trace)
Steven Rostedt (Red Hat)873c6422013-03-04 23:26:06 -05001783 tracing_reset_all_online_cpus();
Steven Rostedt6d723732009-04-10 14:53:50 -04001784}
1785
Steven Rostedt61f919a2009-04-14 18:22:32 -04001786static int trace_module_notify(struct notifier_block *self,
1787 unsigned long val, void *data)
Steven Rostedt6d723732009-04-10 14:53:50 -04001788{
1789 struct module *mod = data;
1790
1791 mutex_lock(&event_mutex);
1792 switch (val) {
1793 case MODULE_STATE_COMING:
1794 trace_module_add_events(mod);
1795 break;
1796 case MODULE_STATE_GOING:
1797 trace_module_remove_events(mod);
1798 break;
1799 }
1800 mutex_unlock(&event_mutex);
1801
1802 return 0;
1803}
Steven Rostedt (Red Hat)315326c2013-03-02 17:37:14 -05001804
1805static int
1806__trace_add_new_mod_event(struct ftrace_event_call *call,
1807 struct trace_array *tr,
1808 struct ftrace_module_file_ops *file_ops)
1809{
1810 return __trace_add_new_event(call, tr,
1811 &file_ops->id, &file_ops->enable,
1812 &file_ops->filter, &file_ops->format);
1813}
1814
Steven Rostedt61f919a2009-04-14 18:22:32 -04001815#else
Steven Rostedt (Red Hat)315326c2013-03-02 17:37:14 -05001816static inline struct ftrace_module_file_ops *
1817find_ftrace_file_ops(struct ftrace_module_file_ops *file_ops, struct module *mod)
Steven Rostedtae63b312012-05-03 23:09:03 -04001818{
1819 return NULL;
1820}
Steven Rostedt (Red Hat)315326c2013-03-02 17:37:14 -05001821static inline int trace_module_notify(struct notifier_block *self,
1822 unsigned long val, void *data)
Steven Rostedt61f919a2009-04-14 18:22:32 -04001823{
1824 return 0;
1825}
Steven Rostedt (Red Hat)315326c2013-03-02 17:37:14 -05001826static inline int
1827__trace_add_new_mod_event(struct ftrace_event_call *call,
1828 struct trace_array *tr,
1829 struct ftrace_module_file_ops *file_ops)
1830{
1831 return -ENODEV;
1832}
Steven Rostedt61f919a2009-04-14 18:22:32 -04001833#endif /* CONFIG_MODULES */
Steven Rostedt6d723732009-04-10 14:53:50 -04001834
Steven Rostedtae63b312012-05-03 23:09:03 -04001835/* Create a new event directory structure for a trace directory. */
1836static void
1837__trace_add_event_dirs(struct trace_array *tr)
1838{
1839 struct ftrace_module_file_ops *file_ops = NULL;
1840 struct ftrace_event_call *call;
1841 int ret;
1842
1843 list_for_each_entry(call, &ftrace_events, list) {
1844 if (call->mod) {
1845 /*
1846 * Directories for events by modules need to
1847 * keep module ref counts when opened (as we don't
1848 * want the module to disappear when reading one
1849 * of these files). The file_ops keep account of
1850 * the module ref count.
Steven Rostedtae63b312012-05-03 23:09:03 -04001851 */
Steven Rostedt (Red Hat)315326c2013-03-02 17:37:14 -05001852 file_ops = find_ftrace_file_ops(file_ops, call->mod);
Steven Rostedtae63b312012-05-03 23:09:03 -04001853 if (!file_ops)
1854 continue; /* Warn? */
Steven Rostedt (Red Hat)315326c2013-03-02 17:37:14 -05001855 ret = __trace_add_new_mod_event(call, tr, file_ops);
Steven Rostedtae63b312012-05-03 23:09:03 -04001856 if (ret < 0)
1857 pr_warning("Could not create directory for event %s\n",
1858 call->name);
1859 continue;
1860 }
1861 ret = __trace_add_new_event(call, tr,
1862 &ftrace_event_id_fops,
1863 &ftrace_enable_fops,
1864 &ftrace_event_filter_fops,
1865 &ftrace_event_format_fops);
1866 if (ret < 0)
1867 pr_warning("Could not create directory for event %s\n",
1868 call->name);
1869 }
1870}
1871
Steven Rostedt (Red Hat)3cd715d2013-03-12 19:35:13 -04001872#ifdef CONFIG_DYNAMIC_FTRACE
1873
1874/* Avoid typos */
1875#define ENABLE_EVENT_STR "enable_event"
1876#define DISABLE_EVENT_STR "disable_event"
1877
1878struct event_probe_data {
1879 struct ftrace_event_file *file;
1880 unsigned long count;
1881 int ref;
1882 bool enable;
1883};
1884
1885static struct ftrace_event_file *
1886find_event_file(struct trace_array *tr, const char *system, const char *event)
1887{
1888 struct ftrace_event_file *file;
1889 struct ftrace_event_call *call;
1890
1891 list_for_each_entry(file, &tr->events, list) {
1892
1893 call = file->event_call;
1894
1895 if (!call->name || !call->class || !call->class->reg)
1896 continue;
1897
1898 if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)
1899 continue;
1900
1901 if (strcmp(event, call->name) == 0 &&
1902 strcmp(system, call->class->system) == 0)
1903 return file;
1904 }
1905 return NULL;
1906}
1907
1908static void
1909event_enable_probe(unsigned long ip, unsigned long parent_ip, void **_data)
1910{
1911 struct event_probe_data **pdata = (struct event_probe_data **)_data;
1912 struct event_probe_data *data = *pdata;
1913
1914 if (!data)
1915 return;
1916
1917 if (data->enable)
1918 clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &data->file->flags);
1919 else
1920 set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &data->file->flags);
1921}
1922
1923static void
1924event_enable_count_probe(unsigned long ip, unsigned long parent_ip, void **_data)
1925{
1926 struct event_probe_data **pdata = (struct event_probe_data **)_data;
1927 struct event_probe_data *data = *pdata;
1928
1929 if (!data)
1930 return;
1931
1932 if (!data->count)
1933 return;
1934
1935 /* Skip if the event is in a state we want to switch to */
1936 if (data->enable == !(data->file->flags & FTRACE_EVENT_FL_SOFT_DISABLED))
1937 return;
1938
1939 if (data->count != -1)
1940 (data->count)--;
1941
1942 event_enable_probe(ip, parent_ip, _data);
1943}
1944
1945static int
1946event_enable_print(struct seq_file *m, unsigned long ip,
1947 struct ftrace_probe_ops *ops, void *_data)
1948{
1949 struct event_probe_data *data = _data;
1950
1951 seq_printf(m, "%ps:", (void *)ip);
1952
1953 seq_printf(m, "%s:%s:%s",
1954 data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR,
1955 data->file->event_call->class->system,
1956 data->file->event_call->name);
1957
1958 if (data->count == -1)
1959 seq_printf(m, ":unlimited\n");
1960 else
1961 seq_printf(m, ":count=%ld\n", data->count);
1962
1963 return 0;
1964}
1965
1966static int
1967event_enable_init(struct ftrace_probe_ops *ops, unsigned long ip,
1968 void **_data)
1969{
1970 struct event_probe_data **pdata = (struct event_probe_data **)_data;
1971 struct event_probe_data *data = *pdata;
1972
1973 data->ref++;
1974 return 0;
1975}
1976
1977static void
1978event_enable_free(struct ftrace_probe_ops *ops, unsigned long ip,
1979 void **_data)
1980{
1981 struct event_probe_data **pdata = (struct event_probe_data **)_data;
1982 struct event_probe_data *data = *pdata;
1983
1984 if (WARN_ON_ONCE(data->ref <= 0))
1985 return;
1986
1987 data->ref--;
1988 if (!data->ref) {
1989 /* Remove the SOFT_MODE flag */
1990 __ftrace_event_enable_disable(data->file, 0, 1);
1991 module_put(data->file->event_call->mod);
1992 kfree(data);
1993 }
1994 *pdata = NULL;
1995}
1996
1997static struct ftrace_probe_ops event_enable_probe_ops = {
1998 .func = event_enable_probe,
1999 .print = event_enable_print,
2000 .init = event_enable_init,
2001 .free = event_enable_free,
2002};
2003
2004static struct ftrace_probe_ops event_enable_count_probe_ops = {
2005 .func = event_enable_count_probe,
2006 .print = event_enable_print,
2007 .init = event_enable_init,
2008 .free = event_enable_free,
2009};
2010
2011static struct ftrace_probe_ops event_disable_probe_ops = {
2012 .func = event_enable_probe,
2013 .print = event_enable_print,
2014 .init = event_enable_init,
2015 .free = event_enable_free,
2016};
2017
2018static struct ftrace_probe_ops event_disable_count_probe_ops = {
2019 .func = event_enable_count_probe,
2020 .print = event_enable_print,
2021 .init = event_enable_init,
2022 .free = event_enable_free,
2023};
2024
2025static int
2026event_enable_func(struct ftrace_hash *hash,
2027 char *glob, char *cmd, char *param, int enabled)
2028{
2029 struct trace_array *tr = top_trace_array();
2030 struct ftrace_event_file *file;
2031 struct ftrace_probe_ops *ops;
2032 struct event_probe_data *data;
2033 const char *system;
2034 const char *event;
2035 char *number;
2036 bool enable;
2037 int ret;
2038
2039 /* hash funcs only work with set_ftrace_filter */
Harsh Prateek Bora8092e802013-05-24 12:52:17 +05302040 if (!enabled || !param)
Steven Rostedt (Red Hat)3cd715d2013-03-12 19:35:13 -04002041 return -EINVAL;
2042
2043 system = strsep(&param, ":");
2044 if (!param)
2045 return -EINVAL;
2046
2047 event = strsep(&param, ":");
2048
2049 mutex_lock(&event_mutex);
2050
2051 ret = -EINVAL;
2052 file = find_event_file(tr, system, event);
2053 if (!file)
2054 goto out;
2055
2056 enable = strcmp(cmd, ENABLE_EVENT_STR) == 0;
2057
2058 if (enable)
2059 ops = param ? &event_enable_count_probe_ops : &event_enable_probe_ops;
2060 else
2061 ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops;
2062
2063 if (glob[0] == '!') {
2064 unregister_ftrace_function_probe_func(glob+1, ops);
2065 ret = 0;
2066 goto out;
2067 }
2068
2069 ret = -ENOMEM;
2070 data = kzalloc(sizeof(*data), GFP_KERNEL);
2071 if (!data)
2072 goto out;
2073
2074 data->enable = enable;
2075 data->count = -1;
2076 data->file = file;
2077
2078 if (!param)
2079 goto out_reg;
2080
2081 number = strsep(&param, ":");
2082
2083 ret = -EINVAL;
2084 if (!strlen(number))
2085 goto out_free;
2086
2087 /*
2088 * We use the callback data field (which is a pointer)
2089 * as our counter.
2090 */
2091 ret = kstrtoul(number, 0, &data->count);
2092 if (ret)
2093 goto out_free;
2094
2095 out_reg:
2096 /* Don't let event modules unload while probe registered */
2097 ret = try_module_get(file->event_call->mod);
Masami Hiramatsu6ed01062013-05-16 20:48:49 +09002098 if (!ret) {
2099 ret = -EBUSY;
Steven Rostedt (Red Hat)3cd715d2013-03-12 19:35:13 -04002100 goto out_free;
Masami Hiramatsu6ed01062013-05-16 20:48:49 +09002101 }
Steven Rostedt (Red Hat)3cd715d2013-03-12 19:35:13 -04002102
2103 ret = __ftrace_event_enable_disable(file, 1, 1);
2104 if (ret < 0)
2105 goto out_put;
2106 ret = register_ftrace_function_probe(glob, ops, data);
Steven Rostedt (Red Hat)ff305de2013-05-09 11:30:26 -04002107 /*
2108 * The above returns on success the # of functions enabled,
2109 * but if it didn't find any functions it returns zero.
2110 * Consider no functions a failure too.
2111 */
Masami Hiramatsua5b85bd2013-05-09 14:44:14 +09002112 if (!ret) {
2113 ret = -ENOENT;
Steven Rostedt (Red Hat)3cd715d2013-03-12 19:35:13 -04002114 goto out_disable;
Steven Rostedt (Red Hat)ff305de2013-05-09 11:30:26 -04002115 } else if (ret < 0)
2116 goto out_disable;
2117 /* Just return zero, not the number of enabled functions */
2118 ret = 0;
Steven Rostedt (Red Hat)3cd715d2013-03-12 19:35:13 -04002119 out:
2120 mutex_unlock(&event_mutex);
2121 return ret;
2122
2123 out_disable:
2124 __ftrace_event_enable_disable(file, 0, 1);
2125 out_put:
2126 module_put(file->event_call->mod);
2127 out_free:
2128 kfree(data);
2129 goto out;
2130}
2131
2132static struct ftrace_func_command event_enable_cmd = {
2133 .name = ENABLE_EVENT_STR,
2134 .func = event_enable_func,
2135};
2136
2137static struct ftrace_func_command event_disable_cmd = {
2138 .name = DISABLE_EVENT_STR,
2139 .func = event_enable_func,
2140};
2141
2142static __init int register_event_cmds(void)
2143{
2144 int ret;
2145
2146 ret = register_ftrace_command(&event_enable_cmd);
2147 if (WARN_ON(ret < 0))
2148 return ret;
2149 ret = register_ftrace_command(&event_disable_cmd);
2150 if (WARN_ON(ret < 0))
2151 unregister_ftrace_command(&event_enable_cmd);
2152 return ret;
2153}
2154#else
2155static inline int register_event_cmds(void) { return 0; }
2156#endif /* CONFIG_DYNAMIC_FTRACE */
2157
Steven Rostedt77248222013-02-27 16:28:06 -05002158/*
2159 * The top level array has already had its ftrace_event_file
2160 * descriptors created in order to allow for early events to
2161 * be recorded. This function is called after the debugfs has been
2162 * initialized, and we now have to create the files associated
2163 * to the events.
2164 */
2165static __init void
2166__trace_early_add_event_dirs(struct trace_array *tr)
2167{
2168 struct ftrace_event_file *file;
2169 int ret;
2170
2171
2172 list_for_each_entry(file, &tr->events, list) {
2173 ret = event_create_dir(tr->event_dir, file,
2174 &ftrace_event_id_fops,
2175 &ftrace_enable_fops,
2176 &ftrace_event_filter_fops,
2177 &ftrace_event_format_fops);
2178 if (ret < 0)
2179 pr_warning("Could not create directory for event %s\n",
2180 file->event_call->name);
2181 }
2182}
2183
2184/*
2185 * For early boot up, the top trace array requires to have
2186 * a list of events that can be enabled. This must be done before
2187 * the filesystem is set up in order to allow events to be traced
2188 * early.
2189 */
2190static __init void
2191__trace_early_add_events(struct trace_array *tr)
2192{
2193 struct ftrace_event_call *call;
2194 int ret;
2195
2196 list_for_each_entry(call, &ftrace_events, list) {
2197 /* Early boot up should not have any modules loaded */
2198 if (WARN_ON_ONCE(call->mod))
2199 continue;
2200
2201 ret = __trace_early_add_new_event(call, tr);
2202 if (ret < 0)
2203 pr_warning("Could not create early event %s\n",
2204 call->name);
2205 }
2206}
2207
Steven Rostedt0c8916c2012-08-07 16:14:16 -04002208/* Remove the event directory structure for a trace directory. */
2209static void
2210__trace_remove_event_dirs(struct trace_array *tr)
2211{
2212 struct ftrace_event_file *file, *next;
2213
2214 list_for_each_entry_safe(file, next, &tr->events, list) {
2215 list_del(&file->list);
2216 debugfs_remove_recursive(file->dir);
2217 remove_subsystem(file->system);
Steven Rostedtd1a29142013-02-27 20:23:57 -05002218 kmem_cache_free(file_cachep, file);
Steven Rostedt0c8916c2012-08-07 16:14:16 -04002219 }
2220}
2221
Steven Rostedtae63b312012-05-03 23:09:03 -04002222static void
2223__add_event_to_tracers(struct ftrace_event_call *call,
2224 struct ftrace_module_file_ops *file_ops)
2225{
2226 struct trace_array *tr;
2227
2228 list_for_each_entry(tr, &ftrace_trace_arrays, list) {
2229 if (file_ops)
Steven Rostedt (Red Hat)315326c2013-03-02 17:37:14 -05002230 __trace_add_new_mod_event(call, tr, file_ops);
Steven Rostedtae63b312012-05-03 23:09:03 -04002231 else
2232 __trace_add_new_event(call, tr,
2233 &ftrace_event_id_fops,
2234 &ftrace_enable_fops,
2235 &ftrace_event_filter_fops,
2236 &ftrace_event_format_fops);
2237 }
2238}
2239
Steven Rostedtec827c72009-09-14 10:50:23 -04002240static struct notifier_block trace_module_nb = {
Steven Rostedt6d723732009-04-10 14:53:50 -04002241 .notifier_call = trace_module_notify,
2242 .priority = 0,
2243};
2244
Steven Rostedte4a9ea52011-01-27 09:15:30 -05002245extern struct ftrace_event_call *__start_ftrace_events[];
2246extern struct ftrace_event_call *__stop_ftrace_events[];
Steven Rostedta59fd602009-04-10 13:52:20 -04002247
Li Zefan020e5f82009-07-01 10:47:05 +08002248static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata;
2249
2250static __init int setup_trace_event(char *str)
2251{
2252 strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE);
Steven Rostedt (Red Hat)55034cd2013-03-07 22:48:09 -05002253 ring_buffer_expanded = true;
2254 tracing_selftest_disabled = true;
Li Zefan020e5f82009-07-01 10:47:05 +08002255
2256 return 1;
2257}
2258__setup("trace_event=", setup_trace_event);
2259
Steven Rostedt77248222013-02-27 16:28:06 -05002260/* Expects to have event_mutex held when called */
2261static int
2262create_event_toplevel_files(struct dentry *parent, struct trace_array *tr)
Steven Rostedtae63b312012-05-03 23:09:03 -04002263{
2264 struct dentry *d_events;
2265 struct dentry *entry;
2266
2267 entry = debugfs_create_file("set_event", 0644, parent,
2268 tr, &ftrace_set_event_fops);
2269 if (!entry) {
2270 pr_warning("Could not create debugfs 'set_event' entry\n");
2271 return -ENOMEM;
2272 }
2273
2274 d_events = debugfs_create_dir("events", parent);
Steven Rostedt277ba042012-08-03 16:10:49 -04002275 if (!d_events) {
Steven Rostedtae63b312012-05-03 23:09:03 -04002276 pr_warning("Could not create debugfs 'events' directory\n");
Steven Rostedt277ba042012-08-03 16:10:49 -04002277 return -ENOMEM;
2278 }
Steven Rostedtae63b312012-05-03 23:09:03 -04002279
2280 /* ring buffer internal formats */
2281 trace_create_file("header_page", 0444, d_events,
2282 ring_buffer_print_page_header,
2283 &ftrace_show_header_fops);
2284
2285 trace_create_file("header_event", 0444, d_events,
2286 ring_buffer_print_entry_header,
2287 &ftrace_show_header_fops);
2288
2289 trace_create_file("enable", 0644, d_events,
2290 tr, &ftrace_tr_enable_fops);
2291
2292 tr->event_dir = d_events;
Steven Rostedt77248222013-02-27 16:28:06 -05002293
2294 return 0;
2295}
2296
2297/**
2298 * event_trace_add_tracer - add a instance of a trace_array to events
2299 * @parent: The parent dentry to place the files/directories for events in
2300 * @tr: The trace array associated with these events
2301 *
2302 * When a new instance is created, it needs to set up its events
2303 * directory, as well as other files associated with events. It also
2304 * creates the event hierachry in the @parent/events directory.
2305 *
2306 * Returns 0 on success.
2307 */
2308int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr)
2309{
2310 int ret;
2311
2312 mutex_lock(&event_mutex);
2313
2314 ret = create_event_toplevel_files(parent, tr);
2315 if (ret)
2316 goto out_unlock;
2317
zhangwei(Jovi)52f6ad62013-03-11 15:14:03 +08002318 down_write(&trace_event_sem);
Steven Rostedtae63b312012-05-03 23:09:03 -04002319 __trace_add_event_dirs(tr);
zhangwei(Jovi)52f6ad62013-03-11 15:14:03 +08002320 up_write(&trace_event_sem);
Steven Rostedt277ba042012-08-03 16:10:49 -04002321
Steven Rostedt77248222013-02-27 16:28:06 -05002322 out_unlock:
Steven Rostedt277ba042012-08-03 16:10:49 -04002323 mutex_unlock(&event_mutex);
Steven Rostedtae63b312012-05-03 23:09:03 -04002324
Steven Rostedt77248222013-02-27 16:28:06 -05002325 return ret;
2326}
2327
2328/*
2329 * The top trace array already had its file descriptors created.
2330 * Now the files themselves need to be created.
2331 */
2332static __init int
2333early_event_add_tracer(struct dentry *parent, struct trace_array *tr)
2334{
2335 int ret;
2336
2337 mutex_lock(&event_mutex);
2338
2339 ret = create_event_toplevel_files(parent, tr);
2340 if (ret)
2341 goto out_unlock;
2342
zhangwei(Jovi)52f6ad62013-03-11 15:14:03 +08002343 down_write(&trace_event_sem);
Steven Rostedt77248222013-02-27 16:28:06 -05002344 __trace_early_add_event_dirs(tr);
zhangwei(Jovi)52f6ad62013-03-11 15:14:03 +08002345 up_write(&trace_event_sem);
Steven Rostedt77248222013-02-27 16:28:06 -05002346
2347 out_unlock:
2348 mutex_unlock(&event_mutex);
2349
2350 return ret;
Steven Rostedtae63b312012-05-03 23:09:03 -04002351}
2352
Steven Rostedt0c8916c2012-08-07 16:14:16 -04002353int event_trace_del_tracer(struct trace_array *tr)
2354{
2355 /* Disable any running events */
2356 __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0);
2357
2358 mutex_lock(&event_mutex);
2359
zhangwei(Jovi)52f6ad62013-03-11 15:14:03 +08002360 down_write(&trace_event_sem);
Steven Rostedt0c8916c2012-08-07 16:14:16 -04002361 __trace_remove_event_dirs(tr);
2362 debugfs_remove_recursive(tr->event_dir);
zhangwei(Jovi)52f6ad62013-03-11 15:14:03 +08002363 up_write(&trace_event_sem);
Steven Rostedt0c8916c2012-08-07 16:14:16 -04002364
2365 tr->event_dir = NULL;
2366
2367 mutex_unlock(&event_mutex);
2368
2369 return 0;
2370}
2371
Steven Rostedtd1a29142013-02-27 20:23:57 -05002372static __init int event_trace_memsetup(void)
2373{
2374 field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC);
2375 file_cachep = KMEM_CACHE(ftrace_event_file, SLAB_PANIC);
2376 return 0;
2377}
2378
Ezequiel Garcia87819152012-09-12 11:47:57 -03002379static __init int event_trace_enable(void)
2380{
Steven Rostedtae63b312012-05-03 23:09:03 -04002381 struct trace_array *tr = top_trace_array();
Ezequiel Garcia87819152012-09-12 11:47:57 -03002382 struct ftrace_event_call **iter, *call;
2383 char *buf = bootup_event_buf;
2384 char *token;
2385 int ret;
2386
2387 for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) {
2388
2389 call = *iter;
2390 ret = event_init(call);
2391 if (!ret)
2392 list_add(&call->list, &ftrace_events);
2393 }
2394
Steven Rostedt77248222013-02-27 16:28:06 -05002395 /*
2396 * We need the top trace array to have a working set of trace
2397 * points at early init, before the debug files and directories
2398 * are created. Create the file entries now, and attach them
2399 * to the actual file dentries later.
2400 */
2401 __trace_early_add_events(tr);
2402
Ezequiel Garcia87819152012-09-12 11:47:57 -03002403 while (true) {
2404 token = strsep(&buf, ",");
2405
2406 if (!token)
2407 break;
2408 if (!*token)
2409 continue;
2410
Steven Rostedtae63b312012-05-03 23:09:03 -04002411 ret = ftrace_set_clr_event(tr, token, 1);
Ezequiel Garcia87819152012-09-12 11:47:57 -03002412 if (ret)
2413 pr_warn("Failed to enable trace event: %s\n", token);
2414 }
Steven Rostedt81698832012-10-11 10:15:05 -04002415
2416 trace_printk_start_comm();
2417
Steven Rostedt (Red Hat)3cd715d2013-03-12 19:35:13 -04002418 register_event_cmds();
2419
Ezequiel Garcia87819152012-09-12 11:47:57 -03002420 return 0;
2421}
2422
Steven Rostedtb77e38a2009-02-24 10:21:36 -05002423static __init int event_trace_init(void)
2424{
Steven Rostedtae63b312012-05-03 23:09:03 -04002425 struct trace_array *tr;
Steven Rostedtb77e38a2009-02-24 10:21:36 -05002426 struct dentry *d_tracer;
2427 struct dentry *entry;
Steven Rostedt6d723732009-04-10 14:53:50 -04002428 int ret;
Steven Rostedtb77e38a2009-02-24 10:21:36 -05002429
Steven Rostedtae63b312012-05-03 23:09:03 -04002430 tr = top_trace_array();
2431
Steven Rostedtb77e38a2009-02-24 10:21:36 -05002432 d_tracer = tracing_init_dentry();
2433 if (!d_tracer)
2434 return 0;
2435
Steven Rostedt2314c4a2009-03-10 12:04:02 -04002436 entry = debugfs_create_file("available_events", 0444, d_tracer,
Steven Rostedtae63b312012-05-03 23:09:03 -04002437 tr, &ftrace_avail_fops);
Steven Rostedt2314c4a2009-03-10 12:04:02 -04002438 if (!entry)
2439 pr_warning("Could not create debugfs "
2440 "'available_events' entry\n");
2441
Li Zefan8728fe52010-05-24 16:22:49 +08002442 if (trace_define_common_fields())
2443 pr_warning("tracing: Failed to allocate common fields");
2444
Steven Rostedt77248222013-02-27 16:28:06 -05002445 ret = early_event_add_tracer(d_tracer, tr);
Steven Rostedtae63b312012-05-03 23:09:03 -04002446 if (ret)
2447 return ret;
Li Zefan020e5f82009-07-01 10:47:05 +08002448
Steven Rostedt6d723732009-04-10 14:53:50 -04002449 ret = register_module_notifier(&trace_module_nb);
Ming Lei55379372009-05-18 23:04:46 +08002450 if (ret)
Steven Rostedt6d723732009-04-10 14:53:50 -04002451 pr_warning("Failed to register trace events module notifier\n");
2452
Steven Rostedtb77e38a2009-02-24 10:21:36 -05002453 return 0;
2454}
Steven Rostedtd1a29142013-02-27 20:23:57 -05002455early_initcall(event_trace_memsetup);
Ezequiel Garcia87819152012-09-12 11:47:57 -03002456core_initcall(event_trace_enable);
Steven Rostedtb77e38a2009-02-24 10:21:36 -05002457fs_initcall(event_trace_init);
Steven Rostedte6187002009-04-15 13:36:40 -04002458
2459#ifdef CONFIG_FTRACE_STARTUP_TEST
2460
2461static DEFINE_SPINLOCK(test_spinlock);
2462static DEFINE_SPINLOCK(test_spinlock_irq);
2463static DEFINE_MUTEX(test_mutex);
2464
2465static __init void test_work(struct work_struct *dummy)
2466{
2467 spin_lock(&test_spinlock);
2468 spin_lock_irq(&test_spinlock_irq);
2469 udelay(1);
2470 spin_unlock_irq(&test_spinlock_irq);
2471 spin_unlock(&test_spinlock);
2472
2473 mutex_lock(&test_mutex);
2474 msleep(1);
2475 mutex_unlock(&test_mutex);
2476}
2477
2478static __init int event_test_thread(void *unused)
2479{
2480 void *test_malloc;
2481
2482 test_malloc = kmalloc(1234, GFP_KERNEL);
2483 if (!test_malloc)
2484 pr_info("failed to kmalloc\n");
2485
2486 schedule_on_each_cpu(test_work);
2487
2488 kfree(test_malloc);
2489
2490 set_current_state(TASK_INTERRUPTIBLE);
2491 while (!kthread_should_stop())
2492 schedule();
2493
2494 return 0;
2495}
2496
2497/*
2498 * Do various things that may trigger events.
2499 */
2500static __init void event_test_stuff(void)
2501{
2502 struct task_struct *test_thread;
2503
2504 test_thread = kthread_run(event_test_thread, NULL, "test-events");
2505 msleep(1);
2506 kthread_stop(test_thread);
2507}
2508
2509/*
2510 * For every trace event defined, we will test each trace point separately,
2511 * and then by groups, and finally all trace points.
2512 */
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002513static __init void event_trace_self_tests(void)
Steven Rostedte6187002009-04-15 13:36:40 -04002514{
Steven Rostedtae63b312012-05-03 23:09:03 -04002515 struct ftrace_subsystem_dir *dir;
2516 struct ftrace_event_file *file;
Steven Rostedte6187002009-04-15 13:36:40 -04002517 struct ftrace_event_call *call;
2518 struct event_subsystem *system;
Steven Rostedtae63b312012-05-03 23:09:03 -04002519 struct trace_array *tr;
Steven Rostedte6187002009-04-15 13:36:40 -04002520 int ret;
2521
Steven Rostedtae63b312012-05-03 23:09:03 -04002522 tr = top_trace_array();
2523
Steven Rostedte6187002009-04-15 13:36:40 -04002524 pr_info("Running tests on trace events:\n");
2525
Steven Rostedtae63b312012-05-03 23:09:03 -04002526 list_for_each_entry(file, &tr->events, list) {
2527
2528 call = file->event_call;
Steven Rostedte6187002009-04-15 13:36:40 -04002529
Steven Rostedt22392912010-04-21 12:27:06 -04002530 /* Only test those that have a probe */
2531 if (!call->class || !call->class->probe)
Steven Rostedte6187002009-04-15 13:36:40 -04002532 continue;
2533
Steven Rostedt1f5a6b42009-09-14 11:58:24 -04002534/*
2535 * Testing syscall events here is pretty useless, but
2536 * we still do it if configured. But this is time consuming.
2537 * What we really need is a user thread to perform the
2538 * syscalls as we test.
2539 */
2540#ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS
Steven Rostedt8f082012010-04-20 10:47:33 -04002541 if (call->class->system &&
2542 strcmp(call->class->system, "syscalls") == 0)
Steven Rostedt1f5a6b42009-09-14 11:58:24 -04002543 continue;
2544#endif
2545
Steven Rostedte6187002009-04-15 13:36:40 -04002546 pr_info("Testing event %s: ", call->name);
2547
2548 /*
2549 * If an event is already enabled, someone is using
2550 * it and the self test should not be on.
2551 */
Steven Rostedtae63b312012-05-03 23:09:03 -04002552 if (file->flags & FTRACE_EVENT_FL_ENABLED) {
Steven Rostedte6187002009-04-15 13:36:40 -04002553 pr_warning("Enabled event during self test!\n");
2554 WARN_ON_ONCE(1);
2555 continue;
2556 }
2557
Steven Rostedtae63b312012-05-03 23:09:03 -04002558 ftrace_event_enable_disable(file, 1);
Steven Rostedte6187002009-04-15 13:36:40 -04002559 event_test_stuff();
Steven Rostedtae63b312012-05-03 23:09:03 -04002560 ftrace_event_enable_disable(file, 0);
Steven Rostedte6187002009-04-15 13:36:40 -04002561
2562 pr_cont("OK\n");
2563 }
2564
2565 /* Now test at the sub system level */
2566
2567 pr_info("Running tests on trace event systems:\n");
2568
Steven Rostedtae63b312012-05-03 23:09:03 -04002569 list_for_each_entry(dir, &tr->systems, list) {
2570
2571 system = dir->subsystem;
Steven Rostedte6187002009-04-15 13:36:40 -04002572
2573 /* the ftrace system is special, skip it */
2574 if (strcmp(system->name, "ftrace") == 0)
2575 continue;
2576
2577 pr_info("Testing event system %s: ", system->name);
2578
Steven Rostedtae63b312012-05-03 23:09:03 -04002579 ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1);
Steven Rostedte6187002009-04-15 13:36:40 -04002580 if (WARN_ON_ONCE(ret)) {
2581 pr_warning("error enabling system %s\n",
2582 system->name);
2583 continue;
2584 }
2585
2586 event_test_stuff();
2587
Steven Rostedtae63b312012-05-03 23:09:03 -04002588 ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0);
Yuanhan Liu76bab1b2012-08-27 15:13:45 +08002589 if (WARN_ON_ONCE(ret)) {
Steven Rostedte6187002009-04-15 13:36:40 -04002590 pr_warning("error disabling system %s\n",
2591 system->name);
Yuanhan Liu76bab1b2012-08-27 15:13:45 +08002592 continue;
2593 }
Steven Rostedte6187002009-04-15 13:36:40 -04002594
2595 pr_cont("OK\n");
2596 }
2597
2598 /* Test with all events enabled */
2599
2600 pr_info("Running tests on all trace events:\n");
2601 pr_info("Testing all events: ");
2602
Steven Rostedtae63b312012-05-03 23:09:03 -04002603 ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1);
Steven Rostedte6187002009-04-15 13:36:40 -04002604 if (WARN_ON_ONCE(ret)) {
Steven Rostedte6187002009-04-15 13:36:40 -04002605 pr_warning("error enabling all events\n");
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002606 return;
Steven Rostedte6187002009-04-15 13:36:40 -04002607 }
2608
2609 event_test_stuff();
2610
2611 /* reset sysname */
Steven Rostedtae63b312012-05-03 23:09:03 -04002612 ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0);
Steven Rostedte6187002009-04-15 13:36:40 -04002613 if (WARN_ON_ONCE(ret)) {
2614 pr_warning("error disabling all events\n");
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002615 return;
Steven Rostedte6187002009-04-15 13:36:40 -04002616 }
2617
2618 pr_cont("OK\n");
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002619}
2620
2621#ifdef CONFIG_FUNCTION_TRACER
2622
Tejun Heo245b2e72009-06-24 15:13:48 +09002623static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable);
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002624
2625static void
Steven Rostedt2f5f6ad2011-08-08 16:57:47 -04002626function_test_events_call(unsigned long ip, unsigned long parent_ip,
Steven Rostedta1e2e312011-08-09 12:50:46 -04002627 struct ftrace_ops *op, struct pt_regs *pt_regs)
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002628{
2629 struct ring_buffer_event *event;
Steven Rostedte77405a2009-09-02 14:17:06 -04002630 struct ring_buffer *buffer;
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002631 struct ftrace_entry *entry;
2632 unsigned long flags;
2633 long disabled;
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002634 int cpu;
2635 int pc;
2636
2637 pc = preempt_count();
Steven Rostedt5168ae52010-06-03 09:36:50 -04002638 preempt_disable_notrace();
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002639 cpu = raw_smp_processor_id();
Tejun Heo245b2e72009-06-24 15:13:48 +09002640 disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu));
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002641
2642 if (disabled != 1)
2643 goto out;
2644
2645 local_save_flags(flags);
2646
Steven Rostedte77405a2009-09-02 14:17:06 -04002647 event = trace_current_buffer_lock_reserve(&buffer,
2648 TRACE_FN, sizeof(*entry),
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002649 flags, pc);
2650 if (!event)
2651 goto out;
2652 entry = ring_buffer_event_data(event);
2653 entry->ip = ip;
2654 entry->parent_ip = parent_ip;
2655
Steven Rostedt0d5c6e12012-11-01 20:54:21 -04002656 trace_buffer_unlock_commit(buffer, event, flags, pc);
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002657
2658 out:
Tejun Heo245b2e72009-06-24 15:13:48 +09002659 atomic_dec(&per_cpu(ftrace_test_event_disable, cpu));
Steven Rostedt5168ae52010-06-03 09:36:50 -04002660 preempt_enable_notrace();
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002661}
2662
2663static struct ftrace_ops trace_ops __initdata =
2664{
2665 .func = function_test_events_call,
Steven Rostedt47409742012-07-20 11:04:44 -04002666 .flags = FTRACE_OPS_FL_RECURSION_SAFE,
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002667};
2668
2669static __init void event_trace_self_test_with_function(void)
2670{
Steven Rostedt17bb6152011-05-23 15:27:46 -04002671 int ret;
2672 ret = register_ftrace_function(&trace_ops);
2673 if (WARN_ON(ret < 0)) {
2674 pr_info("Failed to enable function tracer for event tests\n");
2675 return;
2676 }
Steven Rostedt9ea21c12009-04-16 12:15:44 -04002677 pr_info("Running tests again, along with the function tracer\n");
2678 event_trace_self_tests();
2679 unregister_ftrace_function(&trace_ops);
2680}
2681#else
2682static __init void event_trace_self_test_with_function(void)
2683{
2684}
2685#endif
2686
2687static __init int event_trace_self_tests_init(void)
2688{
Li Zefan020e5f82009-07-01 10:47:05 +08002689 if (!tracing_selftest_disabled) {
2690 event_trace_self_tests();
2691 event_trace_self_test_with_function();
2692 }
Steven Rostedte6187002009-04-15 13:36:40 -04002693
2694 return 0;
2695}
2696
Steven Rostedt28d20e22009-04-20 12:12:44 -04002697late_initcall(event_trace_self_tests_init);
Steven Rostedte6187002009-04-15 13:36:40 -04002698
2699#endif