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Merge tag 'nfsd-5.14' of git://linux-nfs.org/~bfields/linux
[mirror_ubuntu-jammy-kernel.git] / kernel / trace / trace_output.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * trace_output.c
4 *
5 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
6 *
7 */
8 #include <linux/module.h>
9 #include <linux/mutex.h>
10 #include <linux/ftrace.h>
11 #include <linux/sched/clock.h>
12 #include <linux/sched/mm.h>
13
14 #include "trace_output.h"
15
16 /* must be a power of 2 */
17 #define EVENT_HASHSIZE 128
18
19 DECLARE_RWSEM(trace_event_sem);
20
21 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
22
23 static int next_event_type = __TRACE_LAST_TYPE;
24
25 enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
26 {
27 struct trace_seq *s = &iter->seq;
28 struct trace_entry *entry = iter->ent;
29 struct bputs_entry *field;
30
31 trace_assign_type(field, entry);
32
33 trace_seq_puts(s, field->str);
34
35 return trace_handle_return(s);
36 }
37
38 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
39 {
40 struct trace_seq *s = &iter->seq;
41 struct trace_entry *entry = iter->ent;
42 struct bprint_entry *field;
43
44 trace_assign_type(field, entry);
45
46 trace_seq_bprintf(s, field->fmt, field->buf);
47
48 return trace_handle_return(s);
49 }
50
51 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
52 {
53 struct trace_seq *s = &iter->seq;
54 struct trace_entry *entry = iter->ent;
55 struct print_entry *field;
56
57 trace_assign_type(field, entry);
58
59 trace_seq_puts(s, field->buf);
60
61 return trace_handle_return(s);
62 }
63
64 const char *
65 trace_print_flags_seq(struct trace_seq *p, const char *delim,
66 unsigned long flags,
67 const struct trace_print_flags *flag_array)
68 {
69 unsigned long mask;
70 const char *str;
71 const char *ret = trace_seq_buffer_ptr(p);
72 int i, first = 1;
73
74 for (i = 0; flag_array[i].name && flags; i++) {
75
76 mask = flag_array[i].mask;
77 if ((flags & mask) != mask)
78 continue;
79
80 str = flag_array[i].name;
81 flags &= ~mask;
82 if (!first && delim)
83 trace_seq_puts(p, delim);
84 else
85 first = 0;
86 trace_seq_puts(p, str);
87 }
88
89 /* check for left over flags */
90 if (flags) {
91 if (!first && delim)
92 trace_seq_puts(p, delim);
93 trace_seq_printf(p, "0x%lx", flags);
94 }
95
96 trace_seq_putc(p, 0);
97
98 return ret;
99 }
100 EXPORT_SYMBOL(trace_print_flags_seq);
101
102 const char *
103 trace_print_symbols_seq(struct trace_seq *p, unsigned long val,
104 const struct trace_print_flags *symbol_array)
105 {
106 int i;
107 const char *ret = trace_seq_buffer_ptr(p);
108
109 for (i = 0; symbol_array[i].name; i++) {
110
111 if (val != symbol_array[i].mask)
112 continue;
113
114 trace_seq_puts(p, symbol_array[i].name);
115 break;
116 }
117
118 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
119 trace_seq_printf(p, "0x%lx", val);
120
121 trace_seq_putc(p, 0);
122
123 return ret;
124 }
125 EXPORT_SYMBOL(trace_print_symbols_seq);
126
127 #if BITS_PER_LONG == 32
128 const char *
129 trace_print_flags_seq_u64(struct trace_seq *p, const char *delim,
130 unsigned long long flags,
131 const struct trace_print_flags_u64 *flag_array)
132 {
133 unsigned long long mask;
134 const char *str;
135 const char *ret = trace_seq_buffer_ptr(p);
136 int i, first = 1;
137
138 for (i = 0; flag_array[i].name && flags; i++) {
139
140 mask = flag_array[i].mask;
141 if ((flags & mask) != mask)
142 continue;
143
144 str = flag_array[i].name;
145 flags &= ~mask;
146 if (!first && delim)
147 trace_seq_puts(p, delim);
148 else
149 first = 0;
150 trace_seq_puts(p, str);
151 }
152
153 /* check for left over flags */
154 if (flags) {
155 if (!first && delim)
156 trace_seq_puts(p, delim);
157 trace_seq_printf(p, "0x%llx", flags);
158 }
159
160 trace_seq_putc(p, 0);
161
162 return ret;
163 }
164 EXPORT_SYMBOL(trace_print_flags_seq_u64);
165
166 const char *
167 trace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
168 const struct trace_print_flags_u64 *symbol_array)
169 {
170 int i;
171 const char *ret = trace_seq_buffer_ptr(p);
172
173 for (i = 0; symbol_array[i].name; i++) {
174
175 if (val != symbol_array[i].mask)
176 continue;
177
178 trace_seq_puts(p, symbol_array[i].name);
179 break;
180 }
181
182 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
183 trace_seq_printf(p, "0x%llx", val);
184
185 trace_seq_putc(p, 0);
186
187 return ret;
188 }
189 EXPORT_SYMBOL(trace_print_symbols_seq_u64);
190 #endif
191
192 const char *
193 trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
194 unsigned int bitmask_size)
195 {
196 const char *ret = trace_seq_buffer_ptr(p);
197
198 trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8);
199 trace_seq_putc(p, 0);
200
201 return ret;
202 }
203 EXPORT_SYMBOL_GPL(trace_print_bitmask_seq);
204
205 /**
206 * trace_print_hex_seq - print buffer as hex sequence
207 * @p: trace seq struct to write to
208 * @buf: The buffer to print
209 * @buf_len: Length of @buf in bytes
210 * @concatenate: Print @buf as single hex string or with spacing
211 *
212 * Prints the passed buffer as a hex sequence either as a whole,
213 * single hex string if @concatenate is true or with spacing after
214 * each byte in case @concatenate is false.
215 */
216 const char *
217 trace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len,
218 bool concatenate)
219 {
220 int i;
221 const char *ret = trace_seq_buffer_ptr(p);
222 const char *fmt = concatenate ? "%*phN" : "%*ph";
223
224 for (i = 0; i < buf_len; i += 16)
225 trace_seq_printf(p, fmt, min(buf_len - i, 16), &buf[i]);
226 trace_seq_putc(p, 0);
227
228 return ret;
229 }
230 EXPORT_SYMBOL(trace_print_hex_seq);
231
232 const char *
233 trace_print_array_seq(struct trace_seq *p, const void *buf, int count,
234 size_t el_size)
235 {
236 const char *ret = trace_seq_buffer_ptr(p);
237 const char *prefix = "";
238 void *ptr = (void *)buf;
239 size_t buf_len = count * el_size;
240
241 trace_seq_putc(p, '{');
242
243 while (ptr < buf + buf_len) {
244 switch (el_size) {
245 case 1:
246 trace_seq_printf(p, "%s0x%x", prefix,
247 *(u8 *)ptr);
248 break;
249 case 2:
250 trace_seq_printf(p, "%s0x%x", prefix,
251 *(u16 *)ptr);
252 break;
253 case 4:
254 trace_seq_printf(p, "%s0x%x", prefix,
255 *(u32 *)ptr);
256 break;
257 case 8:
258 trace_seq_printf(p, "%s0x%llx", prefix,
259 *(u64 *)ptr);
260 break;
261 default:
262 trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
263 *(u8 *)ptr);
264 el_size = 1;
265 }
266 prefix = ",";
267 ptr += el_size;
268 }
269
270 trace_seq_putc(p, '}');
271 trace_seq_putc(p, 0);
272
273 return ret;
274 }
275 EXPORT_SYMBOL(trace_print_array_seq);
276
277 const char *
278 trace_print_hex_dump_seq(struct trace_seq *p, const char *prefix_str,
279 int prefix_type, int rowsize, int groupsize,
280 const void *buf, size_t len, bool ascii)
281 {
282 const char *ret = trace_seq_buffer_ptr(p);
283
284 trace_seq_putc(p, '\n');
285 trace_seq_hex_dump(p, prefix_str, prefix_type,
286 rowsize, groupsize, buf, len, ascii);
287 trace_seq_putc(p, 0);
288 return ret;
289 }
290 EXPORT_SYMBOL(trace_print_hex_dump_seq);
291
292 int trace_raw_output_prep(struct trace_iterator *iter,
293 struct trace_event *trace_event)
294 {
295 struct trace_event_call *event;
296 struct trace_seq *s = &iter->seq;
297 struct trace_seq *p = &iter->tmp_seq;
298 struct trace_entry *entry;
299
300 event = container_of(trace_event, struct trace_event_call, event);
301 entry = iter->ent;
302
303 if (entry->type != event->event.type) {
304 WARN_ON_ONCE(1);
305 return TRACE_TYPE_UNHANDLED;
306 }
307
308 trace_seq_init(p);
309 trace_seq_printf(s, "%s: ", trace_event_name(event));
310
311 return trace_handle_return(s);
312 }
313 EXPORT_SYMBOL(trace_raw_output_prep);
314
315 void trace_event_printf(struct trace_iterator *iter, const char *fmt, ...)
316 {
317 va_list ap;
318
319 va_start(ap, fmt);
320 trace_check_vprintf(iter, trace_event_format(iter, fmt), ap);
321 va_end(ap);
322 }
323 EXPORT_SYMBOL(trace_event_printf);
324
325 static int trace_output_raw(struct trace_iterator *iter, char *name,
326 char *fmt, va_list ap)
327 {
328 struct trace_seq *s = &iter->seq;
329
330 trace_seq_printf(s, "%s: ", name);
331 trace_seq_vprintf(s, trace_event_format(iter, fmt), ap);
332
333 return trace_handle_return(s);
334 }
335
336 int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
337 {
338 va_list ap;
339 int ret;
340
341 va_start(ap, fmt);
342 ret = trace_output_raw(iter, name, fmt, ap);
343 va_end(ap);
344
345 return ret;
346 }
347 EXPORT_SYMBOL_GPL(trace_output_call);
348
349 #ifdef CONFIG_KRETPROBES
350 static inline const char *kretprobed(const char *name)
351 {
352 static const char tramp_name[] = "kretprobe_trampoline";
353 int size = sizeof(tramp_name);
354
355 if (strncmp(tramp_name, name, size) == 0)
356 return "[unknown/kretprobe'd]";
357 return name;
358 }
359 #else
360 static inline const char *kretprobed(const char *name)
361 {
362 return name;
363 }
364 #endif /* CONFIG_KRETPROBES */
365
366 void
367 trace_seq_print_sym(struct trace_seq *s, unsigned long address, bool offset)
368 {
369 #ifdef CONFIG_KALLSYMS
370 char str[KSYM_SYMBOL_LEN];
371 const char *name;
372
373 if (offset)
374 sprint_symbol(str, address);
375 else
376 kallsyms_lookup(address, NULL, NULL, NULL, str);
377 name = kretprobed(str);
378
379 if (name && strlen(name)) {
380 trace_seq_puts(s, name);
381 return;
382 }
383 #endif
384 trace_seq_printf(s, "0x%08lx", address);
385 }
386
387 #ifndef CONFIG_64BIT
388 # define IP_FMT "%08lx"
389 #else
390 # define IP_FMT "%016lx"
391 #endif
392
393 static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
394 unsigned long ip, unsigned long sym_flags)
395 {
396 struct file *file = NULL;
397 unsigned long vmstart = 0;
398 int ret = 1;
399
400 if (s->full)
401 return 0;
402
403 if (mm) {
404 const struct vm_area_struct *vma;
405
406 mmap_read_lock(mm);
407 vma = find_vma(mm, ip);
408 if (vma) {
409 file = vma->vm_file;
410 vmstart = vma->vm_start;
411 }
412 if (file) {
413 ret = trace_seq_path(s, &file->f_path);
414 if (ret)
415 trace_seq_printf(s, "[+0x%lx]",
416 ip - vmstart);
417 }
418 mmap_read_unlock(mm);
419 }
420 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
421 trace_seq_printf(s, " <" IP_FMT ">", ip);
422 return !trace_seq_has_overflowed(s);
423 }
424
425 int
426 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
427 {
428 if (!ip) {
429 trace_seq_putc(s, '0');
430 goto out;
431 }
432
433 trace_seq_print_sym(s, ip, sym_flags & TRACE_ITER_SYM_OFFSET);
434
435 if (sym_flags & TRACE_ITER_SYM_ADDR)
436 trace_seq_printf(s, " <" IP_FMT ">", ip);
437
438 out:
439 return !trace_seq_has_overflowed(s);
440 }
441
442 /**
443 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
444 * @s: trace seq struct to write to
445 * @entry: The trace entry field from the ring buffer
446 *
447 * Prints the generic fields of irqs off, in hard or softirq, preempt
448 * count.
449 */
450 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
451 {
452 char hardsoft_irq;
453 char need_resched;
454 char irqs_off;
455 int hardirq;
456 int softirq;
457 int nmi;
458
459 nmi = entry->flags & TRACE_FLAG_NMI;
460 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
461 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
462
463 irqs_off =
464 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
465 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
466 '.';
467
468 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
469 TRACE_FLAG_PREEMPT_RESCHED)) {
470 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
471 need_resched = 'N';
472 break;
473 case TRACE_FLAG_NEED_RESCHED:
474 need_resched = 'n';
475 break;
476 case TRACE_FLAG_PREEMPT_RESCHED:
477 need_resched = 'p';
478 break;
479 default:
480 need_resched = '.';
481 break;
482 }
483
484 hardsoft_irq =
485 (nmi && hardirq) ? 'Z' :
486 nmi ? 'z' :
487 (hardirq && softirq) ? 'H' :
488 hardirq ? 'h' :
489 softirq ? 's' :
490 '.' ;
491
492 trace_seq_printf(s, "%c%c%c",
493 irqs_off, need_resched, hardsoft_irq);
494
495 if (entry->preempt_count)
496 trace_seq_printf(s, "%x", entry->preempt_count);
497 else
498 trace_seq_putc(s, '.');
499
500 return !trace_seq_has_overflowed(s);
501 }
502
503 static int
504 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
505 {
506 char comm[TASK_COMM_LEN];
507
508 trace_find_cmdline(entry->pid, comm);
509
510 trace_seq_printf(s, "%8.8s-%-7d %3d",
511 comm, entry->pid, cpu);
512
513 return trace_print_lat_fmt(s, entry);
514 }
515
516 #undef MARK
517 #define MARK(v, s) {.val = v, .sym = s}
518 /* trace overhead mark */
519 static const struct trace_mark {
520 unsigned long long val; /* unit: nsec */
521 char sym;
522 } mark[] = {
523 MARK(1000000000ULL , '$'), /* 1 sec */
524 MARK(100000000ULL , '@'), /* 100 msec */
525 MARK(10000000ULL , '*'), /* 10 msec */
526 MARK(1000000ULL , '#'), /* 1000 usecs */
527 MARK(100000ULL , '!'), /* 100 usecs */
528 MARK(10000ULL , '+'), /* 10 usecs */
529 };
530 #undef MARK
531
532 char trace_find_mark(unsigned long long d)
533 {
534 int i;
535 int size = ARRAY_SIZE(mark);
536
537 for (i = 0; i < size; i++) {
538 if (d > mark[i].val)
539 break;
540 }
541
542 return (i == size) ? ' ' : mark[i].sym;
543 }
544
545 static int
546 lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
547 {
548 struct trace_array *tr = iter->tr;
549 unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
550 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
551 unsigned long long abs_ts = iter->ts - iter->array_buffer->time_start;
552 unsigned long long rel_ts = next_ts - iter->ts;
553 struct trace_seq *s = &iter->seq;
554
555 if (in_ns) {
556 abs_ts = ns2usecs(abs_ts);
557 rel_ts = ns2usecs(rel_ts);
558 }
559
560 if (verbose && in_ns) {
561 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
562 unsigned long abs_msec = (unsigned long)abs_ts;
563 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
564 unsigned long rel_msec = (unsigned long)rel_ts;
565
566 trace_seq_printf(
567 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
568 ns2usecs(iter->ts),
569 abs_msec, abs_usec,
570 rel_msec, rel_usec);
571
572 } else if (verbose && !in_ns) {
573 trace_seq_printf(
574 s, "[%016llx] %lld (+%lld): ",
575 iter->ts, abs_ts, rel_ts);
576
577 } else if (!verbose && in_ns) {
578 trace_seq_printf(
579 s, " %4lldus%c: ",
580 abs_ts,
581 trace_find_mark(rel_ts * NSEC_PER_USEC));
582
583 } else { /* !verbose && !in_ns */
584 trace_seq_printf(s, " %4lld: ", abs_ts);
585 }
586
587 return !trace_seq_has_overflowed(s);
588 }
589
590 static void trace_print_time(struct trace_seq *s, struct trace_iterator *iter,
591 unsigned long long ts)
592 {
593 unsigned long secs, usec_rem;
594 unsigned long long t;
595
596 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
597 t = ns2usecs(ts);
598 usec_rem = do_div(t, USEC_PER_SEC);
599 secs = (unsigned long)t;
600 trace_seq_printf(s, " %5lu.%06lu", secs, usec_rem);
601 } else
602 trace_seq_printf(s, " %12llu", ts);
603 }
604
605 int trace_print_context(struct trace_iterator *iter)
606 {
607 struct trace_array *tr = iter->tr;
608 struct trace_seq *s = &iter->seq;
609 struct trace_entry *entry = iter->ent;
610 char comm[TASK_COMM_LEN];
611
612 trace_find_cmdline(entry->pid, comm);
613
614 trace_seq_printf(s, "%16s-%-7d ", comm, entry->pid);
615
616 if (tr->trace_flags & TRACE_ITER_RECORD_TGID) {
617 unsigned int tgid = trace_find_tgid(entry->pid);
618
619 if (!tgid)
620 trace_seq_printf(s, "(-------) ");
621 else
622 trace_seq_printf(s, "(%7d) ", tgid);
623 }
624
625 trace_seq_printf(s, "[%03d] ", iter->cpu);
626
627 if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
628 trace_print_lat_fmt(s, entry);
629
630 trace_print_time(s, iter, iter->ts);
631 trace_seq_puts(s, ": ");
632
633 return !trace_seq_has_overflowed(s);
634 }
635
636 int trace_print_lat_context(struct trace_iterator *iter)
637 {
638 struct trace_entry *entry, *next_entry;
639 struct trace_array *tr = iter->tr;
640 struct trace_seq *s = &iter->seq;
641 unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
642 u64 next_ts;
643
644 next_entry = trace_find_next_entry(iter, NULL, &next_ts);
645 if (!next_entry)
646 next_ts = iter->ts;
647
648 /* trace_find_next_entry() may change iter->ent */
649 entry = iter->ent;
650
651 if (verbose) {
652 char comm[TASK_COMM_LEN];
653
654 trace_find_cmdline(entry->pid, comm);
655
656 trace_seq_printf(
657 s, "%16s %7d %3d %d %08x %08lx ",
658 comm, entry->pid, iter->cpu, entry->flags,
659 entry->preempt_count, iter->idx);
660 } else {
661 lat_print_generic(s, entry, iter->cpu);
662 }
663
664 lat_print_timestamp(iter, next_ts);
665
666 return !trace_seq_has_overflowed(s);
667 }
668
669 /**
670 * ftrace_find_event - find a registered event
671 * @type: the type of event to look for
672 *
673 * Returns an event of type @type otherwise NULL
674 * Called with trace_event_read_lock() held.
675 */
676 struct trace_event *ftrace_find_event(int type)
677 {
678 struct trace_event *event;
679 unsigned key;
680
681 key = type & (EVENT_HASHSIZE - 1);
682
683 hlist_for_each_entry(event, &event_hash[key], node) {
684 if (event->type == type)
685 return event;
686 }
687
688 return NULL;
689 }
690
691 static LIST_HEAD(ftrace_event_list);
692
693 static int trace_search_list(struct list_head **list)
694 {
695 struct trace_event *e;
696 int next = __TRACE_LAST_TYPE;
697
698 if (list_empty(&ftrace_event_list)) {
699 *list = &ftrace_event_list;
700 return next;
701 }
702
703 /*
704 * We used up all possible max events,
705 * lets see if somebody freed one.
706 */
707 list_for_each_entry(e, &ftrace_event_list, list) {
708 if (e->type != next)
709 break;
710 next++;
711 }
712
713 /* Did we used up all 65 thousand events??? */
714 if (next > TRACE_EVENT_TYPE_MAX)
715 return 0;
716
717 *list = &e->list;
718 return next;
719 }
720
721 void trace_event_read_lock(void)
722 {
723 down_read(&trace_event_sem);
724 }
725
726 void trace_event_read_unlock(void)
727 {
728 up_read(&trace_event_sem);
729 }
730
731 /**
732 * register_trace_event - register output for an event type
733 * @event: the event type to register
734 *
735 * Event types are stored in a hash and this hash is used to
736 * find a way to print an event. If the @event->type is set
737 * then it will use that type, otherwise it will assign a
738 * type to use.
739 *
740 * If you assign your own type, please make sure it is added
741 * to the trace_type enum in trace.h, to avoid collisions
742 * with the dynamic types.
743 *
744 * Returns the event type number or zero on error.
745 */
746 int register_trace_event(struct trace_event *event)
747 {
748 unsigned key;
749 int ret = 0;
750
751 down_write(&trace_event_sem);
752
753 if (WARN_ON(!event))
754 goto out;
755
756 if (WARN_ON(!event->funcs))
757 goto out;
758
759 INIT_LIST_HEAD(&event->list);
760
761 if (!event->type) {
762 struct list_head *list = NULL;
763
764 if (next_event_type > TRACE_EVENT_TYPE_MAX) {
765
766 event->type = trace_search_list(&list);
767 if (!event->type)
768 goto out;
769
770 } else {
771
772 event->type = next_event_type++;
773 list = &ftrace_event_list;
774 }
775
776 if (WARN_ON(ftrace_find_event(event->type)))
777 goto out;
778
779 list_add_tail(&event->list, list);
780
781 } else if (event->type > __TRACE_LAST_TYPE) {
782 printk(KERN_WARNING "Need to add type to trace.h\n");
783 WARN_ON(1);
784 goto out;
785 } else {
786 /* Is this event already used */
787 if (ftrace_find_event(event->type))
788 goto out;
789 }
790
791 if (event->funcs->trace == NULL)
792 event->funcs->trace = trace_nop_print;
793 if (event->funcs->raw == NULL)
794 event->funcs->raw = trace_nop_print;
795 if (event->funcs->hex == NULL)
796 event->funcs->hex = trace_nop_print;
797 if (event->funcs->binary == NULL)
798 event->funcs->binary = trace_nop_print;
799
800 key = event->type & (EVENT_HASHSIZE - 1);
801
802 hlist_add_head(&event->node, &event_hash[key]);
803
804 ret = event->type;
805 out:
806 up_write(&trace_event_sem);
807
808 return ret;
809 }
810 EXPORT_SYMBOL_GPL(register_trace_event);
811
812 /*
813 * Used by module code with the trace_event_sem held for write.
814 */
815 int __unregister_trace_event(struct trace_event *event)
816 {
817 hlist_del(&event->node);
818 list_del(&event->list);
819 return 0;
820 }
821
822 /**
823 * unregister_trace_event - remove a no longer used event
824 * @event: the event to remove
825 */
826 int unregister_trace_event(struct trace_event *event)
827 {
828 down_write(&trace_event_sem);
829 __unregister_trace_event(event);
830 up_write(&trace_event_sem);
831
832 return 0;
833 }
834 EXPORT_SYMBOL_GPL(unregister_trace_event);
835
836 /*
837 * Standard events
838 */
839
840 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
841 struct trace_event *event)
842 {
843 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
844
845 return trace_handle_return(&iter->seq);
846 }
847
848 static void print_fn_trace(struct trace_seq *s, unsigned long ip,
849 unsigned long parent_ip, int flags)
850 {
851 seq_print_ip_sym(s, ip, flags);
852
853 if ((flags & TRACE_ITER_PRINT_PARENT) && parent_ip) {
854 trace_seq_puts(s, " <-");
855 seq_print_ip_sym(s, parent_ip, flags);
856 }
857 }
858
859 /* TRACE_FN */
860 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
861 struct trace_event *event)
862 {
863 struct ftrace_entry *field;
864 struct trace_seq *s = &iter->seq;
865
866 trace_assign_type(field, iter->ent);
867
868 print_fn_trace(s, field->ip, field->parent_ip, flags);
869 trace_seq_putc(s, '\n');
870
871 return trace_handle_return(s);
872 }
873
874 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
875 struct trace_event *event)
876 {
877 struct ftrace_entry *field;
878
879 trace_assign_type(field, iter->ent);
880
881 trace_seq_printf(&iter->seq, "%lx %lx\n",
882 field->ip,
883 field->parent_ip);
884
885 return trace_handle_return(&iter->seq);
886 }
887
888 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
889 struct trace_event *event)
890 {
891 struct ftrace_entry *field;
892 struct trace_seq *s = &iter->seq;
893
894 trace_assign_type(field, iter->ent);
895
896 SEQ_PUT_HEX_FIELD(s, field->ip);
897 SEQ_PUT_HEX_FIELD(s, field->parent_ip);
898
899 return trace_handle_return(s);
900 }
901
902 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
903 struct trace_event *event)
904 {
905 struct ftrace_entry *field;
906 struct trace_seq *s = &iter->seq;
907
908 trace_assign_type(field, iter->ent);
909
910 SEQ_PUT_FIELD(s, field->ip);
911 SEQ_PUT_FIELD(s, field->parent_ip);
912
913 return trace_handle_return(s);
914 }
915
916 static struct trace_event_functions trace_fn_funcs = {
917 .trace = trace_fn_trace,
918 .raw = trace_fn_raw,
919 .hex = trace_fn_hex,
920 .binary = trace_fn_bin,
921 };
922
923 static struct trace_event trace_fn_event = {
924 .type = TRACE_FN,
925 .funcs = &trace_fn_funcs,
926 };
927
928 /* TRACE_CTX an TRACE_WAKE */
929 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
930 char *delim)
931 {
932 struct ctx_switch_entry *field;
933 char comm[TASK_COMM_LEN];
934 int S, T;
935
936
937 trace_assign_type(field, iter->ent);
938
939 T = task_index_to_char(field->next_state);
940 S = task_index_to_char(field->prev_state);
941 trace_find_cmdline(field->next_pid, comm);
942 trace_seq_printf(&iter->seq,
943 " %7d:%3d:%c %s [%03d] %7d:%3d:%c %s\n",
944 field->prev_pid,
945 field->prev_prio,
946 S, delim,
947 field->next_cpu,
948 field->next_pid,
949 field->next_prio,
950 T, comm);
951
952 return trace_handle_return(&iter->seq);
953 }
954
955 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
956 struct trace_event *event)
957 {
958 return trace_ctxwake_print(iter, "==>");
959 }
960
961 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
962 int flags, struct trace_event *event)
963 {
964 return trace_ctxwake_print(iter, " +");
965 }
966
967 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
968 {
969 struct ctx_switch_entry *field;
970 int T;
971
972 trace_assign_type(field, iter->ent);
973
974 if (!S)
975 S = task_index_to_char(field->prev_state);
976 T = task_index_to_char(field->next_state);
977 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
978 field->prev_pid,
979 field->prev_prio,
980 S,
981 field->next_cpu,
982 field->next_pid,
983 field->next_prio,
984 T);
985
986 return trace_handle_return(&iter->seq);
987 }
988
989 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
990 struct trace_event *event)
991 {
992 return trace_ctxwake_raw(iter, 0);
993 }
994
995 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
996 struct trace_event *event)
997 {
998 return trace_ctxwake_raw(iter, '+');
999 }
1000
1001
1002 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
1003 {
1004 struct ctx_switch_entry *field;
1005 struct trace_seq *s = &iter->seq;
1006 int T;
1007
1008 trace_assign_type(field, iter->ent);
1009
1010 if (!S)
1011 S = task_index_to_char(field->prev_state);
1012 T = task_index_to_char(field->next_state);
1013
1014 SEQ_PUT_HEX_FIELD(s, field->prev_pid);
1015 SEQ_PUT_HEX_FIELD(s, field->prev_prio);
1016 SEQ_PUT_HEX_FIELD(s, S);
1017 SEQ_PUT_HEX_FIELD(s, field->next_cpu);
1018 SEQ_PUT_HEX_FIELD(s, field->next_pid);
1019 SEQ_PUT_HEX_FIELD(s, field->next_prio);
1020 SEQ_PUT_HEX_FIELD(s, T);
1021
1022 return trace_handle_return(s);
1023 }
1024
1025 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1026 struct trace_event *event)
1027 {
1028 return trace_ctxwake_hex(iter, 0);
1029 }
1030
1031 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1032 struct trace_event *event)
1033 {
1034 return trace_ctxwake_hex(iter, '+');
1035 }
1036
1037 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1038 int flags, struct trace_event *event)
1039 {
1040 struct ctx_switch_entry *field;
1041 struct trace_seq *s = &iter->seq;
1042
1043 trace_assign_type(field, iter->ent);
1044
1045 SEQ_PUT_FIELD(s, field->prev_pid);
1046 SEQ_PUT_FIELD(s, field->prev_prio);
1047 SEQ_PUT_FIELD(s, field->prev_state);
1048 SEQ_PUT_FIELD(s, field->next_cpu);
1049 SEQ_PUT_FIELD(s, field->next_pid);
1050 SEQ_PUT_FIELD(s, field->next_prio);
1051 SEQ_PUT_FIELD(s, field->next_state);
1052
1053 return trace_handle_return(s);
1054 }
1055
1056 static struct trace_event_functions trace_ctx_funcs = {
1057 .trace = trace_ctx_print,
1058 .raw = trace_ctx_raw,
1059 .hex = trace_ctx_hex,
1060 .binary = trace_ctxwake_bin,
1061 };
1062
1063 static struct trace_event trace_ctx_event = {
1064 .type = TRACE_CTX,
1065 .funcs = &trace_ctx_funcs,
1066 };
1067
1068 static struct trace_event_functions trace_wake_funcs = {
1069 .trace = trace_wake_print,
1070 .raw = trace_wake_raw,
1071 .hex = trace_wake_hex,
1072 .binary = trace_ctxwake_bin,
1073 };
1074
1075 static struct trace_event trace_wake_event = {
1076 .type = TRACE_WAKE,
1077 .funcs = &trace_wake_funcs,
1078 };
1079
1080 /* TRACE_STACK */
1081
1082 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1083 int flags, struct trace_event *event)
1084 {
1085 struct stack_entry *field;
1086 struct trace_seq *s = &iter->seq;
1087 unsigned long *p;
1088 unsigned long *end;
1089
1090 trace_assign_type(field, iter->ent);
1091 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1092
1093 trace_seq_puts(s, "<stack trace>\n");
1094
1095 for (p = field->caller; p && p < end && *p != ULONG_MAX; p++) {
1096
1097 if (trace_seq_has_overflowed(s))
1098 break;
1099
1100 trace_seq_puts(s, " => ");
1101 seq_print_ip_sym(s, *p, flags);
1102 trace_seq_putc(s, '\n');
1103 }
1104
1105 return trace_handle_return(s);
1106 }
1107
1108 static struct trace_event_functions trace_stack_funcs = {
1109 .trace = trace_stack_print,
1110 };
1111
1112 static struct trace_event trace_stack_event = {
1113 .type = TRACE_STACK,
1114 .funcs = &trace_stack_funcs,
1115 };
1116
1117 /* TRACE_USER_STACK */
1118 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1119 int flags, struct trace_event *event)
1120 {
1121 struct trace_array *tr = iter->tr;
1122 struct userstack_entry *field;
1123 struct trace_seq *s = &iter->seq;
1124 struct mm_struct *mm = NULL;
1125 unsigned int i;
1126
1127 trace_assign_type(field, iter->ent);
1128
1129 trace_seq_puts(s, "<user stack trace>\n");
1130
1131 if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
1132 struct task_struct *task;
1133 /*
1134 * we do the lookup on the thread group leader,
1135 * since individual threads might have already quit!
1136 */
1137 rcu_read_lock();
1138 task = find_task_by_vpid(field->tgid);
1139 if (task)
1140 mm = get_task_mm(task);
1141 rcu_read_unlock();
1142 }
1143
1144 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1145 unsigned long ip = field->caller[i];
1146
1147 if (!ip || trace_seq_has_overflowed(s))
1148 break;
1149
1150 trace_seq_puts(s, " => ");
1151 seq_print_user_ip(s, mm, ip, flags);
1152 trace_seq_putc(s, '\n');
1153 }
1154
1155 if (mm)
1156 mmput(mm);
1157
1158 return trace_handle_return(s);
1159 }
1160
1161 static struct trace_event_functions trace_user_stack_funcs = {
1162 .trace = trace_user_stack_print,
1163 };
1164
1165 static struct trace_event trace_user_stack_event = {
1166 .type = TRACE_USER_STACK,
1167 .funcs = &trace_user_stack_funcs,
1168 };
1169
1170 /* TRACE_HWLAT */
1171 static enum print_line_t
1172 trace_hwlat_print(struct trace_iterator *iter, int flags,
1173 struct trace_event *event)
1174 {
1175 struct trace_entry *entry = iter->ent;
1176 struct trace_seq *s = &iter->seq;
1177 struct hwlat_entry *field;
1178
1179 trace_assign_type(field, entry);
1180
1181 trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld count:%d",
1182 field->seqnum,
1183 field->duration,
1184 field->outer_duration,
1185 (long long)field->timestamp.tv_sec,
1186 field->timestamp.tv_nsec, field->count);
1187
1188 if (field->nmi_count) {
1189 /*
1190 * The generic sched_clock() is not NMI safe, thus
1191 * we only record the count and not the time.
1192 */
1193 if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK))
1194 trace_seq_printf(s, " nmi-total:%llu",
1195 field->nmi_total_ts);
1196 trace_seq_printf(s, " nmi-count:%u",
1197 field->nmi_count);
1198 }
1199
1200 trace_seq_putc(s, '\n');
1201
1202 return trace_handle_return(s);
1203 }
1204
1205 static enum print_line_t
1206 trace_hwlat_raw(struct trace_iterator *iter, int flags,
1207 struct trace_event *event)
1208 {
1209 struct hwlat_entry *field;
1210 struct trace_seq *s = &iter->seq;
1211
1212 trace_assign_type(field, iter->ent);
1213
1214 trace_seq_printf(s, "%llu %lld %lld %09ld %u\n",
1215 field->duration,
1216 field->outer_duration,
1217 (long long)field->timestamp.tv_sec,
1218 field->timestamp.tv_nsec,
1219 field->seqnum);
1220
1221 return trace_handle_return(s);
1222 }
1223
1224 static struct trace_event_functions trace_hwlat_funcs = {
1225 .trace = trace_hwlat_print,
1226 .raw = trace_hwlat_raw,
1227 };
1228
1229 static struct trace_event trace_hwlat_event = {
1230 .type = TRACE_HWLAT,
1231 .funcs = &trace_hwlat_funcs,
1232 };
1233
1234 /* TRACE_OSNOISE */
1235 static enum print_line_t
1236 trace_osnoise_print(struct trace_iterator *iter, int flags,
1237 struct trace_event *event)
1238 {
1239 struct trace_entry *entry = iter->ent;
1240 struct trace_seq *s = &iter->seq;
1241 struct osnoise_entry *field;
1242 u64 ratio, ratio_dec;
1243 u64 net_runtime;
1244
1245 trace_assign_type(field, entry);
1246
1247 /*
1248 * compute the available % of cpu time.
1249 */
1250 net_runtime = field->runtime - field->noise;
1251 ratio = net_runtime * 10000000;
1252 do_div(ratio, field->runtime);
1253 ratio_dec = do_div(ratio, 100000);
1254
1255 trace_seq_printf(s, "%llu %10llu %3llu.%05llu %7llu",
1256 field->runtime,
1257 field->noise,
1258 ratio, ratio_dec,
1259 field->max_sample);
1260
1261 trace_seq_printf(s, " %6u", field->hw_count);
1262 trace_seq_printf(s, " %6u", field->nmi_count);
1263 trace_seq_printf(s, " %6u", field->irq_count);
1264 trace_seq_printf(s, " %6u", field->softirq_count);
1265 trace_seq_printf(s, " %6u", field->thread_count);
1266
1267 trace_seq_putc(s, '\n');
1268
1269 return trace_handle_return(s);
1270 }
1271
1272 static enum print_line_t
1273 trace_osnoise_raw(struct trace_iterator *iter, int flags,
1274 struct trace_event *event)
1275 {
1276 struct osnoise_entry *field;
1277 struct trace_seq *s = &iter->seq;
1278
1279 trace_assign_type(field, iter->ent);
1280
1281 trace_seq_printf(s, "%lld %llu %llu %u %u %u %u %u\n",
1282 field->runtime,
1283 field->noise,
1284 field->max_sample,
1285 field->hw_count,
1286 field->nmi_count,
1287 field->irq_count,
1288 field->softirq_count,
1289 field->thread_count);
1290
1291 return trace_handle_return(s);
1292 }
1293
1294 static struct trace_event_functions trace_osnoise_funcs = {
1295 .trace = trace_osnoise_print,
1296 .raw = trace_osnoise_raw,
1297 };
1298
1299 static struct trace_event trace_osnoise_event = {
1300 .type = TRACE_OSNOISE,
1301 .funcs = &trace_osnoise_funcs,
1302 };
1303
1304 /* TRACE_TIMERLAT */
1305 static enum print_line_t
1306 trace_timerlat_print(struct trace_iterator *iter, int flags,
1307 struct trace_event *event)
1308 {
1309 struct trace_entry *entry = iter->ent;
1310 struct trace_seq *s = &iter->seq;
1311 struct timerlat_entry *field;
1312
1313 trace_assign_type(field, entry);
1314
1315 trace_seq_printf(s, "#%-5u context %6s timer_latency %9llu ns\n",
1316 field->seqnum,
1317 field->context ? "thread" : "irq",
1318 field->timer_latency);
1319
1320 return trace_handle_return(s);
1321 }
1322
1323 static enum print_line_t
1324 trace_timerlat_raw(struct trace_iterator *iter, int flags,
1325 struct trace_event *event)
1326 {
1327 struct timerlat_entry *field;
1328 struct trace_seq *s = &iter->seq;
1329
1330 trace_assign_type(field, iter->ent);
1331
1332 trace_seq_printf(s, "%u %d %llu\n",
1333 field->seqnum,
1334 field->context,
1335 field->timer_latency);
1336
1337 return trace_handle_return(s);
1338 }
1339
1340 static struct trace_event_functions trace_timerlat_funcs = {
1341 .trace = trace_timerlat_print,
1342 .raw = trace_timerlat_raw,
1343 };
1344
1345 static struct trace_event trace_timerlat_event = {
1346 .type = TRACE_TIMERLAT,
1347 .funcs = &trace_timerlat_funcs,
1348 };
1349
1350 /* TRACE_BPUTS */
1351 static enum print_line_t
1352 trace_bputs_print(struct trace_iterator *iter, int flags,
1353 struct trace_event *event)
1354 {
1355 struct trace_entry *entry = iter->ent;
1356 struct trace_seq *s = &iter->seq;
1357 struct bputs_entry *field;
1358
1359 trace_assign_type(field, entry);
1360
1361 seq_print_ip_sym(s, field->ip, flags);
1362 trace_seq_puts(s, ": ");
1363 trace_seq_puts(s, field->str);
1364
1365 return trace_handle_return(s);
1366 }
1367
1368
1369 static enum print_line_t
1370 trace_bputs_raw(struct trace_iterator *iter, int flags,
1371 struct trace_event *event)
1372 {
1373 struct bputs_entry *field;
1374 struct trace_seq *s = &iter->seq;
1375
1376 trace_assign_type(field, iter->ent);
1377
1378 trace_seq_printf(s, ": %lx : ", field->ip);
1379 trace_seq_puts(s, field->str);
1380
1381 return trace_handle_return(s);
1382 }
1383
1384 static struct trace_event_functions trace_bputs_funcs = {
1385 .trace = trace_bputs_print,
1386 .raw = trace_bputs_raw,
1387 };
1388
1389 static struct trace_event trace_bputs_event = {
1390 .type = TRACE_BPUTS,
1391 .funcs = &trace_bputs_funcs,
1392 };
1393
1394 /* TRACE_BPRINT */
1395 static enum print_line_t
1396 trace_bprint_print(struct trace_iterator *iter, int flags,
1397 struct trace_event *event)
1398 {
1399 struct trace_entry *entry = iter->ent;
1400 struct trace_seq *s = &iter->seq;
1401 struct bprint_entry *field;
1402
1403 trace_assign_type(field, entry);
1404
1405 seq_print_ip_sym(s, field->ip, flags);
1406 trace_seq_puts(s, ": ");
1407 trace_seq_bprintf(s, field->fmt, field->buf);
1408
1409 return trace_handle_return(s);
1410 }
1411
1412
1413 static enum print_line_t
1414 trace_bprint_raw(struct trace_iterator *iter, int flags,
1415 struct trace_event *event)
1416 {
1417 struct bprint_entry *field;
1418 struct trace_seq *s = &iter->seq;
1419
1420 trace_assign_type(field, iter->ent);
1421
1422 trace_seq_printf(s, ": %lx : ", field->ip);
1423 trace_seq_bprintf(s, field->fmt, field->buf);
1424
1425 return trace_handle_return(s);
1426 }
1427
1428 static struct trace_event_functions trace_bprint_funcs = {
1429 .trace = trace_bprint_print,
1430 .raw = trace_bprint_raw,
1431 };
1432
1433 static struct trace_event trace_bprint_event = {
1434 .type = TRACE_BPRINT,
1435 .funcs = &trace_bprint_funcs,
1436 };
1437
1438 /* TRACE_PRINT */
1439 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1440 int flags, struct trace_event *event)
1441 {
1442 struct print_entry *field;
1443 struct trace_seq *s = &iter->seq;
1444
1445 trace_assign_type(field, iter->ent);
1446
1447 seq_print_ip_sym(s, field->ip, flags);
1448 trace_seq_printf(s, ": %s", field->buf);
1449
1450 return trace_handle_return(s);
1451 }
1452
1453 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1454 struct trace_event *event)
1455 {
1456 struct print_entry *field;
1457
1458 trace_assign_type(field, iter->ent);
1459
1460 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1461
1462 return trace_handle_return(&iter->seq);
1463 }
1464
1465 static struct trace_event_functions trace_print_funcs = {
1466 .trace = trace_print_print,
1467 .raw = trace_print_raw,
1468 };
1469
1470 static struct trace_event trace_print_event = {
1471 .type = TRACE_PRINT,
1472 .funcs = &trace_print_funcs,
1473 };
1474
1475 static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags,
1476 struct trace_event *event)
1477 {
1478 struct raw_data_entry *field;
1479 int i;
1480
1481 trace_assign_type(field, iter->ent);
1482
1483 trace_seq_printf(&iter->seq, "# %x buf:", field->id);
1484
1485 for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++)
1486 trace_seq_printf(&iter->seq, " %02x",
1487 (unsigned char)field->buf[i]);
1488
1489 trace_seq_putc(&iter->seq, '\n');
1490
1491 return trace_handle_return(&iter->seq);
1492 }
1493
1494 static struct trace_event_functions trace_raw_data_funcs = {
1495 .trace = trace_raw_data,
1496 .raw = trace_raw_data,
1497 };
1498
1499 static struct trace_event trace_raw_data_event = {
1500 .type = TRACE_RAW_DATA,
1501 .funcs = &trace_raw_data_funcs,
1502 };
1503
1504 static enum print_line_t
1505 trace_func_repeats_raw(struct trace_iterator *iter, int flags,
1506 struct trace_event *event)
1507 {
1508 struct func_repeats_entry *field;
1509 struct trace_seq *s = &iter->seq;
1510
1511 trace_assign_type(field, iter->ent);
1512
1513 trace_seq_printf(s, "%lu %lu %u %llu\n",
1514 field->ip,
1515 field->parent_ip,
1516 field->count,
1517 FUNC_REPEATS_GET_DELTA_TS(field));
1518
1519 return trace_handle_return(s);
1520 }
1521
1522 static enum print_line_t
1523 trace_func_repeats_print(struct trace_iterator *iter, int flags,
1524 struct trace_event *event)
1525 {
1526 struct func_repeats_entry *field;
1527 struct trace_seq *s = &iter->seq;
1528
1529 trace_assign_type(field, iter->ent);
1530
1531 print_fn_trace(s, field->ip, field->parent_ip, flags);
1532 trace_seq_printf(s, " (repeats: %u, last_ts:", field->count);
1533 trace_print_time(s, iter,
1534 iter->ts - FUNC_REPEATS_GET_DELTA_TS(field));
1535 trace_seq_puts(s, ")\n");
1536
1537 return trace_handle_return(s);
1538 }
1539
1540 static struct trace_event_functions trace_func_repeats_funcs = {
1541 .trace = trace_func_repeats_print,
1542 .raw = trace_func_repeats_raw,
1543 };
1544
1545 static struct trace_event trace_func_repeats_event = {
1546 .type = TRACE_FUNC_REPEATS,
1547 .funcs = &trace_func_repeats_funcs,
1548 };
1549
1550 static struct trace_event *events[] __initdata = {
1551 &trace_fn_event,
1552 &trace_ctx_event,
1553 &trace_wake_event,
1554 &trace_stack_event,
1555 &trace_user_stack_event,
1556 &trace_bputs_event,
1557 &trace_bprint_event,
1558 &trace_print_event,
1559 &trace_hwlat_event,
1560 &trace_osnoise_event,
1561 &trace_timerlat_event,
1562 &trace_raw_data_event,
1563 &trace_func_repeats_event,
1564 NULL
1565 };
1566
1567 __init static int init_events(void)
1568 {
1569 struct trace_event *event;
1570 int i, ret;
1571
1572 for (i = 0; events[i]; i++) {
1573 event = events[i];
1574
1575 ret = register_trace_event(event);
1576 if (!ret) {
1577 printk(KERN_WARNING "event %d failed to register\n",
1578 event->type);
1579 WARN_ON_ONCE(1);
1580 }
1581 }
1582
1583 return 0;
1584 }
1585 early_initcall(init_events);
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