Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...
[linux-2.6.git] / kernel / trace / trace_events.c
1 /*
2  * event tracer
3  *
4  * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
5  *
6  *  - Added format output of fields of the trace point.
7  *    This was based off of work by Tom Zanussi <tzanussi@gmail.com>.
8  *
9  */
10
11 #include <linux/workqueue.h>
12 #include <linux/spinlock.h>
13 #include <linux/kthread.h>
14 #include <linux/debugfs.h>
15 #include <linux/uaccess.h>
16 #include <linux/module.h>
17 #include <linux/ctype.h>
18 #include <linux/slab.h>
19 #include <linux/delay.h>
20
21 #include <asm/setup.h>
22
23 #include "trace_output.h"
24
25 #undef TRACE_SYSTEM
26 #define TRACE_SYSTEM "TRACE_SYSTEM"
27
28 DEFINE_MUTEX(event_mutex);
29
30 LIST_HEAD(ftrace_events);
31 LIST_HEAD(ftrace_common_fields);
32
33 struct list_head *
34 trace_get_fields(struct ftrace_event_call *event_call)
35 {
36         if (!event_call->class->get_fields)
37                 return &event_call->class->fields;
38         return event_call->class->get_fields(event_call);
39 }
40
41 static int __trace_define_field(struct list_head *head, const char *type,
42                                 const char *name, int offset, int size,
43                                 int is_signed, int filter_type)
44 {
45         struct ftrace_event_field *field;
46
47         field = kzalloc(sizeof(*field), GFP_KERNEL);
48         if (!field)
49                 goto err;
50
51         field->name = kstrdup(name, GFP_KERNEL);
52         if (!field->name)
53                 goto err;
54
55         field->type = kstrdup(type, GFP_KERNEL);
56         if (!field->type)
57                 goto err;
58
59         if (filter_type == FILTER_OTHER)
60                 field->filter_type = filter_assign_type(type);
61         else
62                 field->filter_type = filter_type;
63
64         field->offset = offset;
65         field->size = size;
66         field->is_signed = is_signed;
67
68         list_add(&field->link, head);
69
70         return 0;
71
72 err:
73         if (field)
74                 kfree(field->name);
75         kfree(field);
76
77         return -ENOMEM;
78 }
79
80 int trace_define_field(struct ftrace_event_call *call, const char *type,
81                        const char *name, int offset, int size, int is_signed,
82                        int filter_type)
83 {
84         struct list_head *head;
85
86         if (WARN_ON(!call->class))
87                 return 0;
88
89         head = trace_get_fields(call);
90         return __trace_define_field(head, type, name, offset, size,
91                                     is_signed, filter_type);
92 }
93 EXPORT_SYMBOL_GPL(trace_define_field);
94
95 #define __common_field(type, item)                                      \
96         ret = __trace_define_field(&ftrace_common_fields, #type,        \
97                                    "common_" #item,                     \
98                                    offsetof(typeof(ent), item),         \
99                                    sizeof(ent.item),                    \
100                                    is_signed_type(type), FILTER_OTHER); \
101         if (ret)                                                        \
102                 return ret;
103
104 static int trace_define_common_fields(void)
105 {
106         int ret;
107         struct trace_entry ent;
108
109         __common_field(unsigned short, type);
110         __common_field(unsigned char, flags);
111         __common_field(unsigned char, preempt_count);
112         __common_field(int, pid);
113         __common_field(int, lock_depth);
114
115         return ret;
116 }
117
118 void trace_destroy_fields(struct ftrace_event_call *call)
119 {
120         struct ftrace_event_field *field, *next;
121         struct list_head *head;
122
123         head = trace_get_fields(call);
124         list_for_each_entry_safe(field, next, head, link) {
125                 list_del(&field->link);
126                 kfree(field->type);
127                 kfree(field->name);
128                 kfree(field);
129         }
130 }
131
132 int trace_event_raw_init(struct ftrace_event_call *call)
133 {
134         int id;
135
136         id = register_ftrace_event(&call->event);
137         if (!id)
138                 return -ENODEV;
139
140         return 0;
141 }
142 EXPORT_SYMBOL_GPL(trace_event_raw_init);
143
144 int ftrace_event_reg(struct ftrace_event_call *call, enum trace_reg type)
145 {
146         switch (type) {
147         case TRACE_REG_REGISTER:
148                 return tracepoint_probe_register(call->name,
149                                                  call->class->probe,
150                                                  call);
151         case TRACE_REG_UNREGISTER:
152                 tracepoint_probe_unregister(call->name,
153                                             call->class->probe,
154                                             call);
155                 return 0;
156
157 #ifdef CONFIG_PERF_EVENTS
158         case TRACE_REG_PERF_REGISTER:
159                 return tracepoint_probe_register(call->name,
160                                                  call->class->perf_probe,
161                                                  call);
162         case TRACE_REG_PERF_UNREGISTER:
163                 tracepoint_probe_unregister(call->name,
164                                             call->class->perf_probe,
165                                             call);
166                 return 0;
167 #endif
168         }
169         return 0;
170 }
171 EXPORT_SYMBOL_GPL(ftrace_event_reg);
172
173 void trace_event_enable_cmd_record(bool enable)
174 {
175         struct ftrace_event_call *call;
176
177         mutex_lock(&event_mutex);
178         list_for_each_entry(call, &ftrace_events, list) {
179                 if (!(call->flags & TRACE_EVENT_FL_ENABLED))
180                         continue;
181
182                 if (enable) {
183                         tracing_start_cmdline_record();
184                         call->flags |= TRACE_EVENT_FL_RECORDED_CMD;
185                 } else {
186                         tracing_stop_cmdline_record();
187                         call->flags &= ~TRACE_EVENT_FL_RECORDED_CMD;
188                 }
189         }
190         mutex_unlock(&event_mutex);
191 }
192
193 static int ftrace_event_enable_disable(struct ftrace_event_call *call,
194                                         int enable)
195 {
196         int ret = 0;
197
198         switch (enable) {
199         case 0:
200                 if (call->flags & TRACE_EVENT_FL_ENABLED) {
201                         call->flags &= ~TRACE_EVENT_FL_ENABLED;
202                         if (call->flags & TRACE_EVENT_FL_RECORDED_CMD) {
203                                 tracing_stop_cmdline_record();
204                                 call->flags &= ~TRACE_EVENT_FL_RECORDED_CMD;
205                         }
206                         call->class->reg(call, TRACE_REG_UNREGISTER);
207                 }
208                 break;
209         case 1:
210                 if (!(call->flags & TRACE_EVENT_FL_ENABLED)) {
211                         if (trace_flags & TRACE_ITER_RECORD_CMD) {
212                                 tracing_start_cmdline_record();
213                                 call->flags |= TRACE_EVENT_FL_RECORDED_CMD;
214                         }
215                         ret = call->class->reg(call, TRACE_REG_REGISTER);
216                         if (ret) {
217                                 tracing_stop_cmdline_record();
218                                 pr_info("event trace: Could not enable event "
219                                         "%s\n", call->name);
220                                 break;
221                         }
222                         call->flags |= TRACE_EVENT_FL_ENABLED;
223                 }
224                 break;
225         }
226
227         return ret;
228 }
229
230 static void ftrace_clear_events(void)
231 {
232         struct ftrace_event_call *call;
233
234         mutex_lock(&event_mutex);
235         list_for_each_entry(call, &ftrace_events, list) {
236                 ftrace_event_enable_disable(call, 0);
237         }
238         mutex_unlock(&event_mutex);
239 }
240
241 /*
242  * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events.
243  */
244 static int __ftrace_set_clr_event(const char *match, const char *sub,
245                                   const char *event, int set)
246 {
247         struct ftrace_event_call *call;
248         int ret = -EINVAL;
249
250         mutex_lock(&event_mutex);
251         list_for_each_entry(call, &ftrace_events, list) {
252
253                 if (!call->name || !call->class || !call->class->reg)
254                         continue;
255
256                 if (match &&
257                     strcmp(match, call->name) != 0 &&
258                     strcmp(match, call->class->system) != 0)
259                         continue;
260
261                 if (sub && strcmp(sub, call->class->system) != 0)
262                         continue;
263
264                 if (event && strcmp(event, call->name) != 0)
265                         continue;
266
267                 ftrace_event_enable_disable(call, set);
268
269                 ret = 0;
270         }
271         mutex_unlock(&event_mutex);
272
273         return ret;
274 }
275
276 static int ftrace_set_clr_event(char *buf, int set)
277 {
278         char *event = NULL, *sub = NULL, *match;
279
280         /*
281          * The buf format can be <subsystem>:<event-name>
282          *  *:<event-name> means any event by that name.
283          *  :<event-name> is the same.
284          *
285          *  <subsystem>:* means all events in that subsystem
286          *  <subsystem>: means the same.
287          *
288          *  <name> (no ':') means all events in a subsystem with
289          *  the name <name> or any event that matches <name>
290          */
291
292         match = strsep(&buf, ":");
293         if (buf) {
294                 sub = match;
295                 event = buf;
296                 match = NULL;
297
298                 if (!strlen(sub) || strcmp(sub, "*") == 0)
299                         sub = NULL;
300                 if (!strlen(event) || strcmp(event, "*") == 0)
301                         event = NULL;
302         }
303
304         return __ftrace_set_clr_event(match, sub, event, set);
305 }
306
307 /**
308  * trace_set_clr_event - enable or disable an event
309  * @system: system name to match (NULL for any system)
310  * @event: event name to match (NULL for all events, within system)
311  * @set: 1 to enable, 0 to disable
312  *
313  * This is a way for other parts of the kernel to enable or disable
314  * event recording.
315  *
316  * Returns 0 on success, -EINVAL if the parameters do not match any
317  * registered events.
318  */
319 int trace_set_clr_event(const char *system, const char *event, int set)
320 {
321         return __ftrace_set_clr_event(NULL, system, event, set);
322 }
323
324 /* 128 should be much more than enough */
325 #define EVENT_BUF_SIZE          127
326
327 static ssize_t
328 ftrace_event_write(struct file *file, const char __user *ubuf,
329                    size_t cnt, loff_t *ppos)
330 {
331         struct trace_parser parser;
332         ssize_t read, ret;
333
334         if (!cnt)
335                 return 0;
336
337         ret = tracing_update_buffers();
338         if (ret < 0)
339                 return ret;
340
341         if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1))
342                 return -ENOMEM;
343
344         read = trace_get_user(&parser, ubuf, cnt, ppos);
345
346         if (read >= 0 && trace_parser_loaded((&parser))) {
347                 int set = 1;
348
349                 if (*parser.buffer == '!')
350                         set = 0;
351
352                 parser.buffer[parser.idx] = 0;
353
354                 ret = ftrace_set_clr_event(parser.buffer + !set, set);
355                 if (ret)
356                         goto out_put;
357         }
358
359         ret = read;
360
361  out_put:
362         trace_parser_put(&parser);
363
364         return ret;
365 }
366
367 static void *
368 t_next(struct seq_file *m, void *v, loff_t *pos)
369 {
370         struct ftrace_event_call *call = v;
371
372         (*pos)++;
373
374         list_for_each_entry_continue(call, &ftrace_events, list) {
375                 /*
376                  * The ftrace subsystem is for showing formats only.
377                  * They can not be enabled or disabled via the event files.
378                  */
379                 if (call->class && call->class->reg)
380                         return call;
381         }
382
383         return NULL;
384 }
385
386 static void *t_start(struct seq_file *m, loff_t *pos)
387 {
388         struct ftrace_event_call *call;
389         loff_t l;
390
391         mutex_lock(&event_mutex);
392
393         call = list_entry(&ftrace_events, struct ftrace_event_call, list);
394         for (l = 0; l <= *pos; ) {
395                 call = t_next(m, call, &l);
396                 if (!call)
397                         break;
398         }
399         return call;
400 }
401
402 static void *
403 s_next(struct seq_file *m, void *v, loff_t *pos)
404 {
405         struct ftrace_event_call *call = v;
406
407         (*pos)++;
408
409         list_for_each_entry_continue(call, &ftrace_events, list) {
410                 if (call->flags & TRACE_EVENT_FL_ENABLED)
411                         return call;
412         }
413
414         return NULL;
415 }
416
417 static void *s_start(struct seq_file *m, loff_t *pos)
418 {
419         struct ftrace_event_call *call;
420         loff_t l;
421
422         mutex_lock(&event_mutex);
423
424         call = list_entry(&ftrace_events, struct ftrace_event_call, list);
425         for (l = 0; l <= *pos; ) {
426                 call = s_next(m, call, &l);
427                 if (!call)
428                         break;
429         }
430         return call;
431 }
432
433 static int t_show(struct seq_file *m, void *v)
434 {
435         struct ftrace_event_call *call = v;
436
437         if (strcmp(call->class->system, TRACE_SYSTEM) != 0)
438                 seq_printf(m, "%s:", call->class->system);
439         seq_printf(m, "%s\n", call->name);
440
441         return 0;
442 }
443
444 static void t_stop(struct seq_file *m, void *p)
445 {
446         mutex_unlock(&event_mutex);
447 }
448
449 static int
450 ftrace_event_seq_open(struct inode *inode, struct file *file)
451 {
452         const struct seq_operations *seq_ops;
453
454         if ((file->f_mode & FMODE_WRITE) &&
455             (file->f_flags & O_TRUNC))
456                 ftrace_clear_events();
457
458         seq_ops = inode->i_private;
459         return seq_open(file, seq_ops);
460 }
461
462 static ssize_t
463 event_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
464                   loff_t *ppos)
465 {
466         struct ftrace_event_call *call = filp->private_data;
467         char *buf;
468
469         if (call->flags & TRACE_EVENT_FL_ENABLED)
470                 buf = "1\n";
471         else
472                 buf = "0\n";
473
474         return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2);
475 }
476
477 static ssize_t
478 event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
479                    loff_t *ppos)
480 {
481         struct ftrace_event_call *call = filp->private_data;
482         char buf[64];
483         unsigned long val;
484         int ret;
485
486         if (cnt >= sizeof(buf))
487                 return -EINVAL;
488
489         if (copy_from_user(&buf, ubuf, cnt))
490                 return -EFAULT;
491
492         buf[cnt] = 0;
493
494         ret = strict_strtoul(buf, 10, &val);
495         if (ret < 0)
496                 return ret;
497
498         ret = tracing_update_buffers();
499         if (ret < 0)
500                 return ret;
501
502         switch (val) {
503         case 0:
504         case 1:
505                 mutex_lock(&event_mutex);
506                 ret = ftrace_event_enable_disable(call, val);
507                 mutex_unlock(&event_mutex);
508                 break;
509
510         default:
511                 return -EINVAL;
512         }
513
514         *ppos += cnt;
515
516         return ret ? ret : cnt;
517 }
518
519 static ssize_t
520 system_enable_read(struct file *filp, char __user *ubuf, size_t cnt,
521                    loff_t *ppos)
522 {
523         const char set_to_char[4] = { '?', '0', '1', 'X' };
524         const char *system = filp->private_data;
525         struct ftrace_event_call *call;
526         char buf[2];
527         int set = 0;
528         int ret;
529
530         mutex_lock(&event_mutex);
531         list_for_each_entry(call, &ftrace_events, list) {
532                 if (!call->name || !call->class || !call->class->reg)
533                         continue;
534
535                 if (system && strcmp(call->class->system, system) != 0)
536                         continue;
537
538                 /*
539                  * We need to find out if all the events are set
540                  * or if all events or cleared, or if we have
541                  * a mixture.
542                  */
543                 set |= (1 << !!(call->flags & TRACE_EVENT_FL_ENABLED));
544
545                 /*
546                  * If we have a mixture, no need to look further.
547                  */
548                 if (set == 3)
549                         break;
550         }
551         mutex_unlock(&event_mutex);
552
553         buf[0] = set_to_char[set];
554         buf[1] = '\n';
555
556         ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2);
557
558         return ret;
559 }
560
561 static ssize_t
562 system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
563                     loff_t *ppos)
564 {
565         const char *system = filp->private_data;
566         unsigned long val;
567         char buf[64];
568         ssize_t ret;
569
570         if (cnt >= sizeof(buf))
571                 return -EINVAL;
572
573         if (copy_from_user(&buf, ubuf, cnt))
574                 return -EFAULT;
575
576         buf[cnt] = 0;
577
578         ret = strict_strtoul(buf, 10, &val);
579         if (ret < 0)
580                 return ret;
581
582         ret = tracing_update_buffers();
583         if (ret < 0)
584                 return ret;
585
586         if (val != 0 && val != 1)
587                 return -EINVAL;
588
589         ret = __ftrace_set_clr_event(NULL, system, NULL, val);
590         if (ret)
591                 goto out;
592
593         ret = cnt;
594
595 out:
596         *ppos += cnt;
597
598         return ret;
599 }
600
601 enum {
602         FORMAT_HEADER           = 1,
603         FORMAT_FIELD_SEPERATOR  = 2,
604         FORMAT_PRINTFMT         = 3,
605 };
606
607 static void *f_next(struct seq_file *m, void *v, loff_t *pos)
608 {
609         struct ftrace_event_call *call = m->private;
610         struct ftrace_event_field *field;
611         struct list_head *common_head = &ftrace_common_fields;
612         struct list_head *head = trace_get_fields(call);
613
614         (*pos)++;
615
616         switch ((unsigned long)v) {
617         case FORMAT_HEADER:
618                 if (unlikely(list_empty(common_head)))
619                         return NULL;
620
621                 field = list_entry(common_head->prev,
622                                    struct ftrace_event_field, link);
623                 return field;
624
625         case FORMAT_FIELD_SEPERATOR:
626                 if (unlikely(list_empty(head)))
627                         return NULL;
628
629                 field = list_entry(head->prev, struct ftrace_event_field, link);
630                 return field;
631
632         case FORMAT_PRINTFMT:
633                 /* all done */
634                 return NULL;
635         }
636
637         field = v;
638         if (field->link.prev == common_head)
639                 return (void *)FORMAT_FIELD_SEPERATOR;
640         else if (field->link.prev == head)
641                 return (void *)FORMAT_PRINTFMT;
642
643         field = list_entry(field->link.prev, struct ftrace_event_field, link);
644
645         return field;
646 }
647
648 static void *f_start(struct seq_file *m, loff_t *pos)
649 {
650         loff_t l = 0;
651         void *p;
652
653         /* Start by showing the header */
654         if (!*pos)
655                 return (void *)FORMAT_HEADER;
656
657         p = (void *)FORMAT_HEADER;
658         do {
659                 p = f_next(m, p, &l);
660         } while (p && l < *pos);
661
662         return p;
663 }
664
665 static int f_show(struct seq_file *m, void *v)
666 {
667         struct ftrace_event_call *call = m->private;
668         struct ftrace_event_field *field;
669         const char *array_descriptor;
670
671         switch ((unsigned long)v) {
672         case FORMAT_HEADER:
673                 seq_printf(m, "name: %s\n", call->name);
674                 seq_printf(m, "ID: %d\n", call->event.type);
675                 seq_printf(m, "format:\n");
676                 return 0;
677
678         case FORMAT_FIELD_SEPERATOR:
679                 seq_putc(m, '\n');
680                 return 0;
681
682         case FORMAT_PRINTFMT:
683                 seq_printf(m, "\nprint fmt: %s\n",
684                            call->print_fmt);
685                 return 0;
686         }
687
688         field = v;
689
690         /*
691          * Smartly shows the array type(except dynamic array).
692          * Normal:
693          *      field:TYPE VAR
694          * If TYPE := TYPE[LEN], it is shown:
695          *      field:TYPE VAR[LEN]
696          */
697         array_descriptor = strchr(field->type, '[');
698
699         if (!strncmp(field->type, "__data_loc", 10))
700                 array_descriptor = NULL;
701
702         if (!array_descriptor)
703                 seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n",
704                            field->type, field->name, field->offset,
705                            field->size, !!field->is_signed);
706         else
707                 seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n",
708                            (int)(array_descriptor - field->type),
709                            field->type, field->name,
710                            array_descriptor, field->offset,
711                            field->size, !!field->is_signed);
712
713         return 0;
714 }
715
716 static void f_stop(struct seq_file *m, void *p)
717 {
718 }
719
720 static const struct seq_operations trace_format_seq_ops = {
721         .start          = f_start,
722         .next           = f_next,
723         .stop           = f_stop,
724         .show           = f_show,
725 };
726
727 static int trace_format_open(struct inode *inode, struct file *file)
728 {
729         struct ftrace_event_call *call = inode->i_private;
730         struct seq_file *m;
731         int ret;
732
733         ret = seq_open(file, &trace_format_seq_ops);
734         if (ret < 0)
735                 return ret;
736
737         m = file->private_data;
738         m->private = call;
739
740         return 0;
741 }
742
743 static ssize_t
744 event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)
745 {
746         struct ftrace_event_call *call = filp->private_data;
747         struct trace_seq *s;
748         int r;
749
750         if (*ppos)
751                 return 0;
752
753         s = kmalloc(sizeof(*s), GFP_KERNEL);
754         if (!s)
755                 return -ENOMEM;
756
757         trace_seq_init(s);
758         trace_seq_printf(s, "%d\n", call->event.type);
759
760         r = simple_read_from_buffer(ubuf, cnt, ppos,
761                                     s->buffer, s->len);
762         kfree(s);
763         return r;
764 }
765
766 static ssize_t
767 event_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
768                   loff_t *ppos)
769 {
770         struct ftrace_event_call *call = filp->private_data;
771         struct trace_seq *s;
772         int r;
773
774         if (*ppos)
775                 return 0;
776
777         s = kmalloc(sizeof(*s), GFP_KERNEL);
778         if (!s)
779                 return -ENOMEM;
780
781         trace_seq_init(s);
782
783         print_event_filter(call, s);
784         r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
785
786         kfree(s);
787
788         return r;
789 }
790
791 static ssize_t
792 event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
793                    loff_t *ppos)
794 {
795         struct ftrace_event_call *call = filp->private_data;
796         char *buf;
797         int err;
798
799         if (cnt >= PAGE_SIZE)
800                 return -EINVAL;
801
802         buf = (char *)__get_free_page(GFP_TEMPORARY);
803         if (!buf)
804                 return -ENOMEM;
805
806         if (copy_from_user(buf, ubuf, cnt)) {
807                 free_page((unsigned long) buf);
808                 return -EFAULT;
809         }
810         buf[cnt] = '\0';
811
812         err = apply_event_filter(call, buf);
813         free_page((unsigned long) buf);
814         if (err < 0)
815                 return err;
816
817         *ppos += cnt;
818
819         return cnt;
820 }
821
822 static ssize_t
823 subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt,
824                       loff_t *ppos)
825 {
826         struct event_subsystem *system = filp->private_data;
827         struct trace_seq *s;
828         int r;
829
830         if (*ppos)
831                 return 0;
832
833         s = kmalloc(sizeof(*s), GFP_KERNEL);
834         if (!s)
835                 return -ENOMEM;
836
837         trace_seq_init(s);
838
839         print_subsystem_event_filter(system, s);
840         r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
841
842         kfree(s);
843
844         return r;
845 }
846
847 static ssize_t
848 subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt,
849                        loff_t *ppos)
850 {
851         struct event_subsystem *system = filp->private_data;
852         char *buf;
853         int err;
854
855         if (cnt >= PAGE_SIZE)
856                 return -EINVAL;
857
858         buf = (char *)__get_free_page(GFP_TEMPORARY);
859         if (!buf)
860                 return -ENOMEM;
861
862         if (copy_from_user(buf, ubuf, cnt)) {
863                 free_page((unsigned long) buf);
864                 return -EFAULT;
865         }
866         buf[cnt] = '\0';
867
868         err = apply_subsystem_event_filter(system, buf);
869         free_page((unsigned long) buf);
870         if (err < 0)
871                 return err;
872
873         *ppos += cnt;
874
875         return cnt;
876 }
877
878 static ssize_t
879 show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)
880 {
881         int (*func)(struct trace_seq *s) = filp->private_data;
882         struct trace_seq *s;
883         int r;
884
885         if (*ppos)
886                 return 0;
887
888         s = kmalloc(sizeof(*s), GFP_KERNEL);
889         if (!s)
890                 return -ENOMEM;
891
892         trace_seq_init(s);
893
894         func(s);
895         r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len);
896
897         kfree(s);
898
899         return r;
900 }
901
902 static const struct seq_operations show_event_seq_ops = {
903         .start = t_start,
904         .next = t_next,
905         .show = t_show,
906         .stop = t_stop,
907 };
908
909 static const struct seq_operations show_set_event_seq_ops = {
910         .start = s_start,
911         .next = s_next,
912         .show = t_show,
913         .stop = t_stop,
914 };
915
916 static const struct file_operations ftrace_avail_fops = {
917         .open = ftrace_event_seq_open,
918         .read = seq_read,
919         .llseek = seq_lseek,
920         .release = seq_release,
921 };
922
923 static const struct file_operations ftrace_set_event_fops = {
924         .open = ftrace_event_seq_open,
925         .read = seq_read,
926         .write = ftrace_event_write,
927         .llseek = seq_lseek,
928         .release = seq_release,
929 };
930
931 static const struct file_operations ftrace_enable_fops = {
932         .open = tracing_open_generic,
933         .read = event_enable_read,
934         .write = event_enable_write,
935 };
936
937 static const struct file_operations ftrace_event_format_fops = {
938         .open = trace_format_open,
939         .read = seq_read,
940         .llseek = seq_lseek,
941         .release = seq_release,
942 };
943
944 static const struct file_operations ftrace_event_id_fops = {
945         .open = tracing_open_generic,
946         .read = event_id_read,
947 };
948
949 static const struct file_operations ftrace_event_filter_fops = {
950         .open = tracing_open_generic,
951         .read = event_filter_read,
952         .write = event_filter_write,
953 };
954
955 static const struct file_operations ftrace_subsystem_filter_fops = {
956         .open = tracing_open_generic,
957         .read = subsystem_filter_read,
958         .write = subsystem_filter_write,
959 };
960
961 static const struct file_operations ftrace_system_enable_fops = {
962         .open = tracing_open_generic,
963         .read = system_enable_read,
964         .write = system_enable_write,
965 };
966
967 static const struct file_operations ftrace_show_header_fops = {
968         .open = tracing_open_generic,
969         .read = show_header,
970 };
971
972 static struct dentry *event_trace_events_dir(void)
973 {
974         static struct dentry *d_tracer;
975         static struct dentry *d_events;
976
977         if (d_events)
978                 return d_events;
979
980         d_tracer = tracing_init_dentry();
981         if (!d_tracer)
982                 return NULL;
983
984         d_events = debugfs_create_dir("events", d_tracer);
985         if (!d_events)
986                 pr_warning("Could not create debugfs "
987                            "'events' directory\n");
988
989         return d_events;
990 }
991
992 static LIST_HEAD(event_subsystems);
993
994 static struct dentry *
995 event_subsystem_dir(const char *name, struct dentry *d_events)
996 {
997         struct event_subsystem *system;
998         struct dentry *entry;
999
1000         /* First see if we did not already create this dir */
1001         list_for_each_entry(system, &event_subsystems, list) {
1002                 if (strcmp(system->name, name) == 0) {
1003                         system->nr_events++;
1004                         return system->entry;
1005                 }
1006         }
1007
1008         /* need to create new entry */
1009         system = kmalloc(sizeof(*system), GFP_KERNEL);
1010         if (!system) {
1011                 pr_warning("No memory to create event subsystem %s\n",
1012                            name);
1013                 return d_events;
1014         }
1015
1016         system->entry = debugfs_create_dir(name, d_events);
1017         if (!system->entry) {
1018                 pr_warning("Could not create event subsystem %s\n",
1019                            name);
1020                 kfree(system);
1021                 return d_events;
1022         }
1023
1024         system->nr_events = 1;
1025         system->name = kstrdup(name, GFP_KERNEL);
1026         if (!system->name) {
1027                 debugfs_remove(system->entry);
1028                 kfree(system);
1029                 return d_events;
1030         }
1031
1032         list_add(&system->list, &event_subsystems);
1033
1034         system->filter = NULL;
1035
1036         system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL);
1037         if (!system->filter) {
1038                 pr_warning("Could not allocate filter for subsystem "
1039                            "'%s'\n", name);
1040                 return system->entry;
1041         }
1042
1043         entry = debugfs_create_file("filter", 0644, system->entry, system,
1044                                     &ftrace_subsystem_filter_fops);
1045         if (!entry) {
1046                 kfree(system->filter);
1047                 system->filter = NULL;
1048                 pr_warning("Could not create debugfs "
1049                            "'%s/filter' entry\n", name);
1050         }
1051
1052         trace_create_file("enable", 0644, system->entry,
1053                           (void *)system->name,
1054                           &ftrace_system_enable_fops);
1055
1056         return system->entry;
1057 }
1058
1059 static int
1060 event_create_dir(struct ftrace_event_call *call, struct dentry *d_events,
1061                  const struct file_operations *id,
1062                  const struct file_operations *enable,
1063                  const struct file_operations *filter,
1064                  const struct file_operations *format)
1065 {
1066         struct list_head *head;
1067         int ret;
1068
1069         /*
1070          * If the trace point header did not define TRACE_SYSTEM
1071          * then the system would be called "TRACE_SYSTEM".
1072          */
1073         if (strcmp(call->class->system, TRACE_SYSTEM) != 0)
1074                 d_events = event_subsystem_dir(call->class->system, d_events);
1075
1076         call->dir = debugfs_create_dir(call->name, d_events);
1077         if (!call->dir) {
1078                 pr_warning("Could not create debugfs "
1079                            "'%s' directory\n", call->name);
1080                 return -1;
1081         }
1082
1083         if (call->class->reg)
1084                 trace_create_file("enable", 0644, call->dir, call,
1085                                   enable);
1086
1087 #ifdef CONFIG_PERF_EVENTS
1088         if (call->event.type && call->class->reg)
1089                 trace_create_file("id", 0444, call->dir, call,
1090                                   id);
1091 #endif
1092
1093         /*
1094          * Other events may have the same class. Only update
1095          * the fields if they are not already defined.
1096          */
1097         head = trace_get_fields(call);
1098         if (list_empty(head)) {
1099                 ret = call->class->define_fields(call);
1100                 if (ret < 0) {
1101                         pr_warning("Could not initialize trace point"
1102                                    " events/%s\n", call->name);
1103                         return ret;
1104                 }
1105         }
1106         trace_create_file("filter", 0644, call->dir, call,
1107                           filter);
1108
1109         trace_create_file("format", 0444, call->dir, call,
1110                           format);
1111
1112         return 0;
1113 }
1114
1115 static int
1116 __trace_add_event_call(struct ftrace_event_call *call, struct module *mod,
1117                        const struct file_operations *id,
1118                        const struct file_operations *enable,
1119                        const struct file_operations *filter,
1120                        const struct file_operations *format)
1121 {
1122         struct dentry *d_events;
1123         int ret;
1124
1125         /* The linker may leave blanks */
1126         if (!call->name)
1127                 return -EINVAL;
1128
1129         if (call->class->raw_init) {
1130                 ret = call->class->raw_init(call);
1131                 if (ret < 0) {
1132                         if (ret != -ENOSYS)
1133                                 pr_warning("Could not initialize trace events/%s\n",
1134                                            call->name);
1135                         return ret;
1136                 }
1137         }
1138
1139         d_events = event_trace_events_dir();
1140         if (!d_events)
1141                 return -ENOENT;
1142
1143         ret = event_create_dir(call, d_events, id, enable, filter, format);
1144         if (!ret)
1145                 list_add(&call->list, &ftrace_events);
1146         call->mod = mod;
1147
1148         return ret;
1149 }
1150
1151 /* Add an additional event_call dynamically */
1152 int trace_add_event_call(struct ftrace_event_call *call)
1153 {
1154         int ret;
1155         mutex_lock(&event_mutex);
1156         ret = __trace_add_event_call(call, NULL, &ftrace_event_id_fops,
1157                                      &ftrace_enable_fops,
1158                                      &ftrace_event_filter_fops,
1159                                      &ftrace_event_format_fops);
1160         mutex_unlock(&event_mutex);
1161         return ret;
1162 }
1163
1164 static void remove_subsystem_dir(const char *name)
1165 {
1166         struct event_subsystem *system;
1167
1168         if (strcmp(name, TRACE_SYSTEM) == 0)
1169                 return;
1170
1171         list_for_each_entry(system, &event_subsystems, list) {
1172                 if (strcmp(system->name, name) == 0) {
1173                         if (!--system->nr_events) {
1174                                 struct event_filter *filter = system->filter;
1175
1176                                 debugfs_remove_recursive(system->entry);
1177                                 list_del(&system->list);
1178                                 if (filter) {
1179                                         kfree(filter->filter_string);
1180                                         kfree(filter);
1181                                 }
1182                                 kfree(system->name);
1183                                 kfree(system);
1184                         }
1185                         break;
1186                 }
1187         }
1188 }
1189
1190 /*
1191  * Must be called under locking both of event_mutex and trace_event_mutex.
1192  */
1193 static void __trace_remove_event_call(struct ftrace_event_call *call)
1194 {
1195         ftrace_event_enable_disable(call, 0);
1196         if (call->event.funcs)
1197                 __unregister_ftrace_event(&call->event);
1198         debugfs_remove_recursive(call->dir);
1199         list_del(&call->list);
1200         trace_destroy_fields(call);
1201         destroy_preds(call);
1202         remove_subsystem_dir(call->class->system);
1203 }
1204
1205 /* Remove an event_call */
1206 void trace_remove_event_call(struct ftrace_event_call *call)
1207 {
1208         mutex_lock(&event_mutex);
1209         down_write(&trace_event_mutex);
1210         __trace_remove_event_call(call);
1211         up_write(&trace_event_mutex);
1212         mutex_unlock(&event_mutex);
1213 }
1214
1215 #define for_each_event(event, start, end)                       \
1216         for (event = start;                                     \
1217              (unsigned long)event < (unsigned long)end;         \
1218              event++)
1219
1220 #ifdef CONFIG_MODULES
1221
1222 static LIST_HEAD(ftrace_module_file_list);
1223
1224 /*
1225  * Modules must own their file_operations to keep up with
1226  * reference counting.
1227  */
1228 struct ftrace_module_file_ops {
1229         struct list_head                list;
1230         struct module                   *mod;
1231         struct file_operations          id;
1232         struct file_operations          enable;
1233         struct file_operations          format;
1234         struct file_operations          filter;
1235 };
1236
1237 static struct ftrace_module_file_ops *
1238 trace_create_file_ops(struct module *mod)
1239 {
1240         struct ftrace_module_file_ops *file_ops;
1241
1242         /*
1243          * This is a bit of a PITA. To allow for correct reference
1244          * counting, modules must "own" their file_operations.
1245          * To do this, we allocate the file operations that will be
1246          * used in the event directory.
1247          */
1248
1249         file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL);
1250         if (!file_ops)
1251                 return NULL;
1252
1253         file_ops->mod = mod;
1254
1255         file_ops->id = ftrace_event_id_fops;
1256         file_ops->id.owner = mod;
1257
1258         file_ops->enable = ftrace_enable_fops;
1259         file_ops->enable.owner = mod;
1260
1261         file_ops->filter = ftrace_event_filter_fops;
1262         file_ops->filter.owner = mod;
1263
1264         file_ops->format = ftrace_event_format_fops;
1265         file_ops->format.owner = mod;
1266
1267         list_add(&file_ops->list, &ftrace_module_file_list);
1268
1269         return file_ops;
1270 }
1271
1272 static void trace_module_add_events(struct module *mod)
1273 {
1274         struct ftrace_module_file_ops *file_ops = NULL;
1275         struct ftrace_event_call *call, *start, *end;
1276
1277         start = mod->trace_events;
1278         end = mod->trace_events + mod->num_trace_events;
1279
1280         if (start == end)
1281                 return;
1282
1283         file_ops = trace_create_file_ops(mod);
1284         if (!file_ops)
1285                 return;
1286
1287         for_each_event(call, start, end) {
1288                 __trace_add_event_call(call, mod,
1289                                        &file_ops->id, &file_ops->enable,
1290                                        &file_ops->filter, &file_ops->format);
1291         }
1292 }
1293
1294 static void trace_module_remove_events(struct module *mod)
1295 {
1296         struct ftrace_module_file_ops *file_ops;
1297         struct ftrace_event_call *call, *p;
1298         bool found = false;
1299
1300         down_write(&trace_event_mutex);
1301         list_for_each_entry_safe(call, p, &ftrace_events, list) {
1302                 if (call->mod == mod) {
1303                         found = true;
1304                         __trace_remove_event_call(call);
1305                 }
1306         }
1307
1308         /* Now free the file_operations */
1309         list_for_each_entry(file_ops, &ftrace_module_file_list, list) {
1310                 if (file_ops->mod == mod)
1311                         break;
1312         }
1313         if (&file_ops->list != &ftrace_module_file_list) {
1314                 list_del(&file_ops->list);
1315                 kfree(file_ops);
1316         }
1317
1318         /*
1319          * It is safest to reset the ring buffer if the module being unloaded
1320          * registered any events.
1321          */
1322         if (found)
1323                 tracing_reset_current_online_cpus();
1324         up_write(&trace_event_mutex);
1325 }
1326
1327 static int trace_module_notify(struct notifier_block *self,
1328                                unsigned long val, void *data)
1329 {
1330         struct module *mod = data;
1331
1332         mutex_lock(&event_mutex);
1333         switch (val) {
1334         case MODULE_STATE_COMING:
1335                 trace_module_add_events(mod);
1336                 break;
1337         case MODULE_STATE_GOING:
1338                 trace_module_remove_events(mod);
1339                 break;
1340         }
1341         mutex_unlock(&event_mutex);
1342
1343         return 0;
1344 }
1345 #else
1346 static int trace_module_notify(struct notifier_block *self,
1347                                unsigned long val, void *data)
1348 {
1349         return 0;
1350 }
1351 #endif /* CONFIG_MODULES */
1352
1353 static struct notifier_block trace_module_nb = {
1354         .notifier_call = trace_module_notify,
1355         .priority = 0,
1356 };
1357
1358 extern struct ftrace_event_call __start_ftrace_events[];
1359 extern struct ftrace_event_call __stop_ftrace_events[];
1360
1361 static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata;
1362
1363 static __init int setup_trace_event(char *str)
1364 {
1365         strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE);
1366         ring_buffer_expanded = 1;
1367         tracing_selftest_disabled = 1;
1368
1369         return 1;
1370 }
1371 __setup("trace_event=", setup_trace_event);
1372
1373 static __init int event_trace_init(void)
1374 {
1375         struct ftrace_event_call *call;
1376         struct dentry *d_tracer;
1377         struct dentry *entry;
1378         struct dentry *d_events;
1379         int ret;
1380         char *buf = bootup_event_buf;
1381         char *token;
1382
1383         d_tracer = tracing_init_dentry();
1384         if (!d_tracer)
1385                 return 0;
1386
1387         entry = debugfs_create_file("available_events", 0444, d_tracer,
1388                                     (void *)&show_event_seq_ops,
1389                                     &ftrace_avail_fops);
1390         if (!entry)
1391                 pr_warning("Could not create debugfs "
1392                            "'available_events' entry\n");
1393
1394         entry = debugfs_create_file("set_event", 0644, d_tracer,
1395                                     (void *)&show_set_event_seq_ops,
1396                                     &ftrace_set_event_fops);
1397         if (!entry)
1398                 pr_warning("Could not create debugfs "
1399                            "'set_event' entry\n");
1400
1401         d_events = event_trace_events_dir();
1402         if (!d_events)
1403                 return 0;
1404
1405         /* ring buffer internal formats */
1406         trace_create_file("header_page", 0444, d_events,
1407                           ring_buffer_print_page_header,
1408                           &ftrace_show_header_fops);
1409
1410         trace_create_file("header_event", 0444, d_events,
1411                           ring_buffer_print_entry_header,
1412                           &ftrace_show_header_fops);
1413
1414         trace_create_file("enable", 0644, d_events,
1415                           NULL, &ftrace_system_enable_fops);
1416
1417         if (trace_define_common_fields())
1418                 pr_warning("tracing: Failed to allocate common fields");
1419
1420         for_each_event(call, __start_ftrace_events, __stop_ftrace_events) {
1421                 __trace_add_event_call(call, NULL, &ftrace_event_id_fops,
1422                                        &ftrace_enable_fops,
1423                                        &ftrace_event_filter_fops,
1424                                        &ftrace_event_format_fops);
1425         }
1426
1427         while (true) {
1428                 token = strsep(&buf, ",");
1429
1430                 if (!token)
1431                         break;
1432                 if (!*token)
1433                         continue;
1434
1435                 ret = ftrace_set_clr_event(token, 1);
1436                 if (ret)
1437                         pr_warning("Failed to enable trace event: %s\n", token);
1438         }
1439
1440         ret = register_module_notifier(&trace_module_nb);
1441         if (ret)
1442                 pr_warning("Failed to register trace events module notifier\n");
1443
1444         return 0;
1445 }
1446 fs_initcall(event_trace_init);
1447
1448 #ifdef CONFIG_FTRACE_STARTUP_TEST
1449
1450 static DEFINE_SPINLOCK(test_spinlock);
1451 static DEFINE_SPINLOCK(test_spinlock_irq);
1452 static DEFINE_MUTEX(test_mutex);
1453
1454 static __init void test_work(struct work_struct *dummy)
1455 {
1456         spin_lock(&test_spinlock);
1457         spin_lock_irq(&test_spinlock_irq);
1458         udelay(1);
1459         spin_unlock_irq(&test_spinlock_irq);
1460         spin_unlock(&test_spinlock);
1461
1462         mutex_lock(&test_mutex);
1463         msleep(1);
1464         mutex_unlock(&test_mutex);
1465 }
1466
1467 static __init int event_test_thread(void *unused)
1468 {
1469         void *test_malloc;
1470
1471         test_malloc = kmalloc(1234, GFP_KERNEL);
1472         if (!test_malloc)
1473                 pr_info("failed to kmalloc\n");
1474
1475         schedule_on_each_cpu(test_work);
1476
1477         kfree(test_malloc);
1478
1479         set_current_state(TASK_INTERRUPTIBLE);
1480         while (!kthread_should_stop())
1481                 schedule();
1482
1483         return 0;
1484 }
1485
1486 /*
1487  * Do various things that may trigger events.
1488  */
1489 static __init void event_test_stuff(void)
1490 {
1491         struct task_struct *test_thread;
1492
1493         test_thread = kthread_run(event_test_thread, NULL, "test-events");
1494         msleep(1);
1495         kthread_stop(test_thread);
1496 }
1497
1498 /*
1499  * For every trace event defined, we will test each trace point separately,
1500  * and then by groups, and finally all trace points.
1501  */
1502 static __init void event_trace_self_tests(void)
1503 {
1504         struct ftrace_event_call *call;
1505         struct event_subsystem *system;
1506         int ret;
1507
1508         pr_info("Running tests on trace events:\n");
1509
1510         list_for_each_entry(call, &ftrace_events, list) {
1511
1512                 /* Only test those that have a probe */
1513                 if (!call->class || !call->class->probe)
1514                         continue;
1515
1516 /*
1517  * Testing syscall events here is pretty useless, but
1518  * we still do it if configured. But this is time consuming.
1519  * What we really need is a user thread to perform the
1520  * syscalls as we test.
1521  */
1522 #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS
1523                 if (call->class->system &&
1524                     strcmp(call->class->system, "syscalls") == 0)
1525                         continue;
1526 #endif
1527
1528                 pr_info("Testing event %s: ", call->name);
1529
1530                 /*
1531                  * If an event is already enabled, someone is using
1532                  * it and the self test should not be on.
1533                  */
1534                 if (call->flags & TRACE_EVENT_FL_ENABLED) {
1535                         pr_warning("Enabled event during self test!\n");
1536                         WARN_ON_ONCE(1);
1537                         continue;
1538                 }
1539
1540                 ftrace_event_enable_disable(call, 1);
1541                 event_test_stuff();
1542                 ftrace_event_enable_disable(call, 0);
1543
1544                 pr_cont("OK\n");
1545         }
1546
1547         /* Now test at the sub system level */
1548
1549         pr_info("Running tests on trace event systems:\n");
1550
1551         list_for_each_entry(system, &event_subsystems, list) {
1552
1553                 /* the ftrace system is special, skip it */
1554                 if (strcmp(system->name, "ftrace") == 0)
1555                         continue;
1556
1557                 pr_info("Testing event system %s: ", system->name);
1558
1559                 ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1);
1560                 if (WARN_ON_ONCE(ret)) {
1561                         pr_warning("error enabling system %s\n",
1562                                    system->name);
1563                         continue;
1564                 }
1565
1566                 event_test_stuff();
1567
1568                 ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0);
1569                 if (WARN_ON_ONCE(ret))
1570                         pr_warning("error disabling system %s\n",
1571                                    system->name);
1572
1573                 pr_cont("OK\n");
1574         }
1575
1576         /* Test with all events enabled */
1577
1578         pr_info("Running tests on all trace events:\n");
1579         pr_info("Testing all events: ");
1580
1581         ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1);
1582         if (WARN_ON_ONCE(ret)) {
1583                 pr_warning("error enabling all events\n");
1584                 return;
1585         }
1586
1587         event_test_stuff();
1588
1589         /* reset sysname */
1590         ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0);
1591         if (WARN_ON_ONCE(ret)) {
1592                 pr_warning("error disabling all events\n");
1593                 return;
1594         }
1595
1596         pr_cont("OK\n");
1597 }
1598
1599 #ifdef CONFIG_FUNCTION_TRACER
1600
1601 static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable);
1602
1603 static void
1604 function_test_events_call(unsigned long ip, unsigned long parent_ip)
1605 {
1606         struct ring_buffer_event *event;
1607         struct ring_buffer *buffer;
1608         struct ftrace_entry *entry;
1609         unsigned long flags;
1610         long disabled;
1611         int cpu;
1612         int pc;
1613
1614         pc = preempt_count();
1615         preempt_disable_notrace();
1616         cpu = raw_smp_processor_id();
1617         disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu));
1618
1619         if (disabled != 1)
1620                 goto out;
1621
1622         local_save_flags(flags);
1623
1624         event = trace_current_buffer_lock_reserve(&buffer,
1625                                                   TRACE_FN, sizeof(*entry),
1626                                                   flags, pc);
1627         if (!event)
1628                 goto out;
1629         entry   = ring_buffer_event_data(event);
1630         entry->ip                       = ip;
1631         entry->parent_ip                = parent_ip;
1632
1633         trace_nowake_buffer_unlock_commit(buffer, event, flags, pc);
1634
1635  out:
1636         atomic_dec(&per_cpu(ftrace_test_event_disable, cpu));
1637         preempt_enable_notrace();
1638 }
1639
1640 static struct ftrace_ops trace_ops __initdata  =
1641 {
1642         .func = function_test_events_call,
1643 };
1644
1645 static __init void event_trace_self_test_with_function(void)
1646 {
1647         register_ftrace_function(&trace_ops);
1648         pr_info("Running tests again, along with the function tracer\n");
1649         event_trace_self_tests();
1650         unregister_ftrace_function(&trace_ops);
1651 }
1652 #else
1653 static __init void event_trace_self_test_with_function(void)
1654 {
1655 }
1656 #endif
1657
1658 static __init int event_trace_self_tests_init(void)
1659 {
1660         if (!tracing_selftest_disabled) {
1661                 event_trace_self_tests();
1662                 event_trace_self_test_with_function();
1663         }
1664
1665         return 0;
1666 }
1667
1668 late_initcall(event_trace_self_tests_init);
1669
1670 #endif