Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl
[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         .llseek = default_llseek,
936 };
937
938 static const struct file_operations ftrace_event_format_fops = {
939         .open = trace_format_open,
940         .read = seq_read,
941         .llseek = seq_lseek,
942         .release = seq_release,
943 };
944
945 static const struct file_operations ftrace_event_id_fops = {
946         .open = tracing_open_generic,
947         .read = event_id_read,
948         .llseek = default_llseek,
949 };
950
951 static const struct file_operations ftrace_event_filter_fops = {
952         .open = tracing_open_generic,
953         .read = event_filter_read,
954         .write = event_filter_write,
955         .llseek = default_llseek,
956 };
957
958 static const struct file_operations ftrace_subsystem_filter_fops = {
959         .open = tracing_open_generic,
960         .read = subsystem_filter_read,
961         .write = subsystem_filter_write,
962         .llseek = default_llseek,
963 };
964
965 static const struct file_operations ftrace_system_enable_fops = {
966         .open = tracing_open_generic,
967         .read = system_enable_read,
968         .write = system_enable_write,
969         .llseek = default_llseek,
970 };
971
972 static const struct file_operations ftrace_show_header_fops = {
973         .open = tracing_open_generic,
974         .read = show_header,
975         .llseek = default_llseek,
976 };
977
978 static struct dentry *event_trace_events_dir(void)
979 {
980         static struct dentry *d_tracer;
981         static struct dentry *d_events;
982
983         if (d_events)
984                 return d_events;
985
986         d_tracer = tracing_init_dentry();
987         if (!d_tracer)
988                 return NULL;
989
990         d_events = debugfs_create_dir("events", d_tracer);
991         if (!d_events)
992                 pr_warning("Could not create debugfs "
993                            "'events' directory\n");
994
995         return d_events;
996 }
997
998 static LIST_HEAD(event_subsystems);
999
1000 static struct dentry *
1001 event_subsystem_dir(const char *name, struct dentry *d_events)
1002 {
1003         struct event_subsystem *system;
1004         struct dentry *entry;
1005
1006         /* First see if we did not already create this dir */
1007         list_for_each_entry(system, &event_subsystems, list) {
1008                 if (strcmp(system->name, name) == 0) {
1009                         system->nr_events++;
1010                         return system->entry;
1011                 }
1012         }
1013
1014         /* need to create new entry */
1015         system = kmalloc(sizeof(*system), GFP_KERNEL);
1016         if (!system) {
1017                 pr_warning("No memory to create event subsystem %s\n",
1018                            name);
1019                 return d_events;
1020         }
1021
1022         system->entry = debugfs_create_dir(name, d_events);
1023         if (!system->entry) {
1024                 pr_warning("Could not create event subsystem %s\n",
1025                            name);
1026                 kfree(system);
1027                 return d_events;
1028         }
1029
1030         system->nr_events = 1;
1031         system->name = kstrdup(name, GFP_KERNEL);
1032         if (!system->name) {
1033                 debugfs_remove(system->entry);
1034                 kfree(system);
1035                 return d_events;
1036         }
1037
1038         list_add(&system->list, &event_subsystems);
1039
1040         system->filter = NULL;
1041
1042         system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL);
1043         if (!system->filter) {
1044                 pr_warning("Could not allocate filter for subsystem "
1045                            "'%s'\n", name);
1046                 return system->entry;
1047         }
1048
1049         entry = debugfs_create_file("filter", 0644, system->entry, system,
1050                                     &ftrace_subsystem_filter_fops);
1051         if (!entry) {
1052                 kfree(system->filter);
1053                 system->filter = NULL;
1054                 pr_warning("Could not create debugfs "
1055                            "'%s/filter' entry\n", name);
1056         }
1057
1058         trace_create_file("enable", 0644, system->entry,
1059                           (void *)system->name,
1060                           &ftrace_system_enable_fops);
1061
1062         return system->entry;
1063 }
1064
1065 static int
1066 event_create_dir(struct ftrace_event_call *call, struct dentry *d_events,
1067                  const struct file_operations *id,
1068                  const struct file_operations *enable,
1069                  const struct file_operations *filter,
1070                  const struct file_operations *format)
1071 {
1072         struct list_head *head;
1073         int ret;
1074
1075         /*
1076          * If the trace point header did not define TRACE_SYSTEM
1077          * then the system would be called "TRACE_SYSTEM".
1078          */
1079         if (strcmp(call->class->system, TRACE_SYSTEM) != 0)
1080                 d_events = event_subsystem_dir(call->class->system, d_events);
1081
1082         call->dir = debugfs_create_dir(call->name, d_events);
1083         if (!call->dir) {
1084                 pr_warning("Could not create debugfs "
1085                            "'%s' directory\n", call->name);
1086                 return -1;
1087         }
1088
1089         if (call->class->reg)
1090                 trace_create_file("enable", 0644, call->dir, call,
1091                                   enable);
1092
1093 #ifdef CONFIG_PERF_EVENTS
1094         if (call->event.type && call->class->reg)
1095                 trace_create_file("id", 0444, call->dir, call,
1096                                   id);
1097 #endif
1098
1099         /*
1100          * Other events may have the same class. Only update
1101          * the fields if they are not already defined.
1102          */
1103         head = trace_get_fields(call);
1104         if (list_empty(head)) {
1105                 ret = call->class->define_fields(call);
1106                 if (ret < 0) {
1107                         pr_warning("Could not initialize trace point"
1108                                    " events/%s\n", call->name);
1109                         return ret;
1110                 }
1111         }
1112         trace_create_file("filter", 0644, call->dir, call,
1113                           filter);
1114
1115         trace_create_file("format", 0444, call->dir, call,
1116                           format);
1117
1118         return 0;
1119 }
1120
1121 static int
1122 __trace_add_event_call(struct ftrace_event_call *call, struct module *mod,
1123                        const struct file_operations *id,
1124                        const struct file_operations *enable,
1125                        const struct file_operations *filter,
1126                        const struct file_operations *format)
1127 {
1128         struct dentry *d_events;
1129         int ret;
1130
1131         /* The linker may leave blanks */
1132         if (!call->name)
1133                 return -EINVAL;
1134
1135         if (call->class->raw_init) {
1136                 ret = call->class->raw_init(call);
1137                 if (ret < 0) {
1138                         if (ret != -ENOSYS)
1139                                 pr_warning("Could not initialize trace events/%s\n",
1140                                            call->name);
1141                         return ret;
1142                 }
1143         }
1144
1145         d_events = event_trace_events_dir();
1146         if (!d_events)
1147                 return -ENOENT;
1148
1149         ret = event_create_dir(call, d_events, id, enable, filter, format);
1150         if (!ret)
1151                 list_add(&call->list, &ftrace_events);
1152         call->mod = mod;
1153
1154         return ret;
1155 }
1156
1157 /* Add an additional event_call dynamically */
1158 int trace_add_event_call(struct ftrace_event_call *call)
1159 {
1160         int ret;
1161         mutex_lock(&event_mutex);
1162         ret = __trace_add_event_call(call, NULL, &ftrace_event_id_fops,
1163                                      &ftrace_enable_fops,
1164                                      &ftrace_event_filter_fops,
1165                                      &ftrace_event_format_fops);
1166         mutex_unlock(&event_mutex);
1167         return ret;
1168 }
1169
1170 static void remove_subsystem_dir(const char *name)
1171 {
1172         struct event_subsystem *system;
1173
1174         if (strcmp(name, TRACE_SYSTEM) == 0)
1175                 return;
1176
1177         list_for_each_entry(system, &event_subsystems, list) {
1178                 if (strcmp(system->name, name) == 0) {
1179                         if (!--system->nr_events) {
1180                                 struct event_filter *filter = system->filter;
1181
1182                                 debugfs_remove_recursive(system->entry);
1183                                 list_del(&system->list);
1184                                 if (filter) {
1185                                         kfree(filter->filter_string);
1186                                         kfree(filter);
1187                                 }
1188                                 kfree(system->name);
1189                                 kfree(system);
1190                         }
1191                         break;
1192                 }
1193         }
1194 }
1195
1196 /*
1197  * Must be called under locking both of event_mutex and trace_event_mutex.
1198  */
1199 static void __trace_remove_event_call(struct ftrace_event_call *call)
1200 {
1201         ftrace_event_enable_disable(call, 0);
1202         if (call->event.funcs)
1203                 __unregister_ftrace_event(&call->event);
1204         debugfs_remove_recursive(call->dir);
1205         list_del(&call->list);
1206         trace_destroy_fields(call);
1207         destroy_preds(call);
1208         remove_subsystem_dir(call->class->system);
1209 }
1210
1211 /* Remove an event_call */
1212 void trace_remove_event_call(struct ftrace_event_call *call)
1213 {
1214         mutex_lock(&event_mutex);
1215         down_write(&trace_event_mutex);
1216         __trace_remove_event_call(call);
1217         up_write(&trace_event_mutex);
1218         mutex_unlock(&event_mutex);
1219 }
1220
1221 #define for_each_event(event, start, end)                       \
1222         for (event = start;                                     \
1223              (unsigned long)event < (unsigned long)end;         \
1224              event++)
1225
1226 #ifdef CONFIG_MODULES
1227
1228 static LIST_HEAD(ftrace_module_file_list);
1229
1230 /*
1231  * Modules must own their file_operations to keep up with
1232  * reference counting.
1233  */
1234 struct ftrace_module_file_ops {
1235         struct list_head                list;
1236         struct module                   *mod;
1237         struct file_operations          id;
1238         struct file_operations          enable;
1239         struct file_operations          format;
1240         struct file_operations          filter;
1241 };
1242
1243 static struct ftrace_module_file_ops *
1244 trace_create_file_ops(struct module *mod)
1245 {
1246         struct ftrace_module_file_ops *file_ops;
1247
1248         /*
1249          * This is a bit of a PITA. To allow for correct reference
1250          * counting, modules must "own" their file_operations.
1251          * To do this, we allocate the file operations that will be
1252          * used in the event directory.
1253          */
1254
1255         file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL);
1256         if (!file_ops)
1257                 return NULL;
1258
1259         file_ops->mod = mod;
1260
1261         file_ops->id = ftrace_event_id_fops;
1262         file_ops->id.owner = mod;
1263
1264         file_ops->enable = ftrace_enable_fops;
1265         file_ops->enable.owner = mod;
1266
1267         file_ops->filter = ftrace_event_filter_fops;
1268         file_ops->filter.owner = mod;
1269
1270         file_ops->format = ftrace_event_format_fops;
1271         file_ops->format.owner = mod;
1272
1273         list_add(&file_ops->list, &ftrace_module_file_list);
1274
1275         return file_ops;
1276 }
1277
1278 static void trace_module_add_events(struct module *mod)
1279 {
1280         struct ftrace_module_file_ops *file_ops = NULL;
1281         struct ftrace_event_call *call, *start, *end;
1282
1283         start = mod->trace_events;
1284         end = mod->trace_events + mod->num_trace_events;
1285
1286         if (start == end)
1287                 return;
1288
1289         file_ops = trace_create_file_ops(mod);
1290         if (!file_ops)
1291                 return;
1292
1293         for_each_event(call, start, end) {
1294                 __trace_add_event_call(call, mod,
1295                                        &file_ops->id, &file_ops->enable,
1296                                        &file_ops->filter, &file_ops->format);
1297         }
1298 }
1299
1300 static void trace_module_remove_events(struct module *mod)
1301 {
1302         struct ftrace_module_file_ops *file_ops;
1303         struct ftrace_event_call *call, *p;
1304         bool found = false;
1305
1306         down_write(&trace_event_mutex);
1307         list_for_each_entry_safe(call, p, &ftrace_events, list) {
1308                 if (call->mod == mod) {
1309                         found = true;
1310                         __trace_remove_event_call(call);
1311                 }
1312         }
1313
1314         /* Now free the file_operations */
1315         list_for_each_entry(file_ops, &ftrace_module_file_list, list) {
1316                 if (file_ops->mod == mod)
1317                         break;
1318         }
1319         if (&file_ops->list != &ftrace_module_file_list) {
1320                 list_del(&file_ops->list);
1321                 kfree(file_ops);
1322         }
1323
1324         /*
1325          * It is safest to reset the ring buffer if the module being unloaded
1326          * registered any events.
1327          */
1328         if (found)
1329                 tracing_reset_current_online_cpus();
1330         up_write(&trace_event_mutex);
1331 }
1332
1333 static int trace_module_notify(struct notifier_block *self,
1334                                unsigned long val, void *data)
1335 {
1336         struct module *mod = data;
1337
1338         mutex_lock(&event_mutex);
1339         switch (val) {
1340         case MODULE_STATE_COMING:
1341                 trace_module_add_events(mod);
1342                 break;
1343         case MODULE_STATE_GOING:
1344                 trace_module_remove_events(mod);
1345                 break;
1346         }
1347         mutex_unlock(&event_mutex);
1348
1349         return 0;
1350 }
1351 #else
1352 static int trace_module_notify(struct notifier_block *self,
1353                                unsigned long val, void *data)
1354 {
1355         return 0;
1356 }
1357 #endif /* CONFIG_MODULES */
1358
1359 static struct notifier_block trace_module_nb = {
1360         .notifier_call = trace_module_notify,
1361         .priority = 0,
1362 };
1363
1364 extern struct ftrace_event_call __start_ftrace_events[];
1365 extern struct ftrace_event_call __stop_ftrace_events[];
1366
1367 static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata;
1368
1369 static __init int setup_trace_event(char *str)
1370 {
1371         strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE);
1372         ring_buffer_expanded = 1;
1373         tracing_selftest_disabled = 1;
1374
1375         return 1;
1376 }
1377 __setup("trace_event=", setup_trace_event);
1378
1379 static __init int event_trace_init(void)
1380 {
1381         struct ftrace_event_call *call;
1382         struct dentry *d_tracer;
1383         struct dentry *entry;
1384         struct dentry *d_events;
1385         int ret;
1386         char *buf = bootup_event_buf;
1387         char *token;
1388
1389         d_tracer = tracing_init_dentry();
1390         if (!d_tracer)
1391                 return 0;
1392
1393         entry = debugfs_create_file("available_events", 0444, d_tracer,
1394                                     (void *)&show_event_seq_ops,
1395                                     &ftrace_avail_fops);
1396         if (!entry)
1397                 pr_warning("Could not create debugfs "
1398                            "'available_events' entry\n");
1399
1400         entry = debugfs_create_file("set_event", 0644, d_tracer,
1401                                     (void *)&show_set_event_seq_ops,
1402                                     &ftrace_set_event_fops);
1403         if (!entry)
1404                 pr_warning("Could not create debugfs "
1405                            "'set_event' entry\n");
1406
1407         d_events = event_trace_events_dir();
1408         if (!d_events)
1409                 return 0;
1410
1411         /* ring buffer internal formats */
1412         trace_create_file("header_page", 0444, d_events,
1413                           ring_buffer_print_page_header,
1414                           &ftrace_show_header_fops);
1415
1416         trace_create_file("header_event", 0444, d_events,
1417                           ring_buffer_print_entry_header,
1418                           &ftrace_show_header_fops);
1419
1420         trace_create_file("enable", 0644, d_events,
1421                           NULL, &ftrace_system_enable_fops);
1422
1423         if (trace_define_common_fields())
1424                 pr_warning("tracing: Failed to allocate common fields");
1425
1426         for_each_event(call, __start_ftrace_events, __stop_ftrace_events) {
1427                 __trace_add_event_call(call, NULL, &ftrace_event_id_fops,
1428                                        &ftrace_enable_fops,
1429                                        &ftrace_event_filter_fops,
1430                                        &ftrace_event_format_fops);
1431         }
1432
1433         while (true) {
1434                 token = strsep(&buf, ",");
1435
1436                 if (!token)
1437                         break;
1438                 if (!*token)
1439                         continue;
1440
1441                 ret = ftrace_set_clr_event(token, 1);
1442                 if (ret)
1443                         pr_warning("Failed to enable trace event: %s\n", token);
1444         }
1445
1446         ret = register_module_notifier(&trace_module_nb);
1447         if (ret)
1448                 pr_warning("Failed to register trace events module notifier\n");
1449
1450         return 0;
1451 }
1452 fs_initcall(event_trace_init);
1453
1454 #ifdef CONFIG_FTRACE_STARTUP_TEST
1455
1456 static DEFINE_SPINLOCK(test_spinlock);
1457 static DEFINE_SPINLOCK(test_spinlock_irq);
1458 static DEFINE_MUTEX(test_mutex);
1459
1460 static __init void test_work(struct work_struct *dummy)
1461 {
1462         spin_lock(&test_spinlock);
1463         spin_lock_irq(&test_spinlock_irq);
1464         udelay(1);
1465         spin_unlock_irq(&test_spinlock_irq);
1466         spin_unlock(&test_spinlock);
1467
1468         mutex_lock(&test_mutex);
1469         msleep(1);
1470         mutex_unlock(&test_mutex);
1471 }
1472
1473 static __init int event_test_thread(void *unused)
1474 {
1475         void *test_malloc;
1476
1477         test_malloc = kmalloc(1234, GFP_KERNEL);
1478         if (!test_malloc)
1479                 pr_info("failed to kmalloc\n");
1480
1481         schedule_on_each_cpu(test_work);
1482
1483         kfree(test_malloc);
1484
1485         set_current_state(TASK_INTERRUPTIBLE);
1486         while (!kthread_should_stop())
1487                 schedule();
1488
1489         return 0;
1490 }
1491
1492 /*
1493  * Do various things that may trigger events.
1494  */
1495 static __init void event_test_stuff(void)
1496 {
1497         struct task_struct *test_thread;
1498
1499         test_thread = kthread_run(event_test_thread, NULL, "test-events");
1500         msleep(1);
1501         kthread_stop(test_thread);
1502 }
1503
1504 /*
1505  * For every trace event defined, we will test each trace point separately,
1506  * and then by groups, and finally all trace points.
1507  */
1508 static __init void event_trace_self_tests(void)
1509 {
1510         struct ftrace_event_call *call;
1511         struct event_subsystem *system;
1512         int ret;
1513
1514         pr_info("Running tests on trace events:\n");
1515
1516         list_for_each_entry(call, &ftrace_events, list) {
1517
1518                 /* Only test those that have a probe */
1519                 if (!call->class || !call->class->probe)
1520                         continue;
1521
1522 /*
1523  * Testing syscall events here is pretty useless, but
1524  * we still do it if configured. But this is time consuming.
1525  * What we really need is a user thread to perform the
1526  * syscalls as we test.
1527  */
1528 #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS
1529                 if (call->class->system &&
1530                     strcmp(call->class->system, "syscalls") == 0)
1531                         continue;
1532 #endif
1533
1534                 pr_info("Testing event %s: ", call->name);
1535
1536                 /*
1537                  * If an event is already enabled, someone is using
1538                  * it and the self test should not be on.
1539                  */
1540                 if (call->flags & TRACE_EVENT_FL_ENABLED) {
1541                         pr_warning("Enabled event during self test!\n");
1542                         WARN_ON_ONCE(1);
1543                         continue;
1544                 }
1545
1546                 ftrace_event_enable_disable(call, 1);
1547                 event_test_stuff();
1548                 ftrace_event_enable_disable(call, 0);
1549
1550                 pr_cont("OK\n");
1551         }
1552
1553         /* Now test at the sub system level */
1554
1555         pr_info("Running tests on trace event systems:\n");
1556
1557         list_for_each_entry(system, &event_subsystems, list) {
1558
1559                 /* the ftrace system is special, skip it */
1560                 if (strcmp(system->name, "ftrace") == 0)
1561                         continue;
1562
1563                 pr_info("Testing event system %s: ", system->name);
1564
1565                 ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1);
1566                 if (WARN_ON_ONCE(ret)) {
1567                         pr_warning("error enabling system %s\n",
1568                                    system->name);
1569                         continue;
1570                 }
1571
1572                 event_test_stuff();
1573
1574                 ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0);
1575                 if (WARN_ON_ONCE(ret))
1576                         pr_warning("error disabling system %s\n",
1577                                    system->name);
1578
1579                 pr_cont("OK\n");
1580         }
1581
1582         /* Test with all events enabled */
1583
1584         pr_info("Running tests on all trace events:\n");
1585         pr_info("Testing all events: ");
1586
1587         ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1);
1588         if (WARN_ON_ONCE(ret)) {
1589                 pr_warning("error enabling all events\n");
1590                 return;
1591         }
1592
1593         event_test_stuff();
1594
1595         /* reset sysname */
1596         ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0);
1597         if (WARN_ON_ONCE(ret)) {
1598                 pr_warning("error disabling all events\n");
1599                 return;
1600         }
1601
1602         pr_cont("OK\n");
1603 }
1604
1605 #ifdef CONFIG_FUNCTION_TRACER
1606
1607 static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable);
1608
1609 static void
1610 function_test_events_call(unsigned long ip, unsigned long parent_ip)
1611 {
1612         struct ring_buffer_event *event;
1613         struct ring_buffer *buffer;
1614         struct ftrace_entry *entry;
1615         unsigned long flags;
1616         long disabled;
1617         int cpu;
1618         int pc;
1619
1620         pc = preempt_count();
1621         preempt_disable_notrace();
1622         cpu = raw_smp_processor_id();
1623         disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu));
1624
1625         if (disabled != 1)
1626                 goto out;
1627
1628         local_save_flags(flags);
1629
1630         event = trace_current_buffer_lock_reserve(&buffer,
1631                                                   TRACE_FN, sizeof(*entry),
1632                                                   flags, pc);
1633         if (!event)
1634                 goto out;
1635         entry   = ring_buffer_event_data(event);
1636         entry->ip                       = ip;
1637         entry->parent_ip                = parent_ip;
1638
1639         trace_nowake_buffer_unlock_commit(buffer, event, flags, pc);
1640
1641  out:
1642         atomic_dec(&per_cpu(ftrace_test_event_disable, cpu));
1643         preempt_enable_notrace();
1644 }
1645
1646 static struct ftrace_ops trace_ops __initdata  =
1647 {
1648         .func = function_test_events_call,
1649 };
1650
1651 static __init void event_trace_self_test_with_function(void)
1652 {
1653         register_ftrace_function(&trace_ops);
1654         pr_info("Running tests again, along with the function tracer\n");
1655         event_trace_self_tests();
1656         unregister_ftrace_function(&trace_ops);
1657 }
1658 #else
1659 static __init void event_trace_self_test_with_function(void)
1660 {
1661 }
1662 #endif
1663
1664 static __init int event_trace_self_tests_init(void)
1665 {
1666         if (!tracing_selftest_disabled) {
1667                 event_trace_self_tests();
1668                 event_trace_self_test_with_function();
1669         }
1670
1671         return 0;
1672 }
1673
1674 late_initcall(event_trace_self_tests_init);
1675
1676 #endif