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1/*
2 * trace_output.c
3 *
4 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
5 *
6 */
7#include <linux/module.h>
8#include <linux/mutex.h>
9#include <linux/ftrace.h>
10#include <linux/sched/clock.h>
11#include <linux/sched/mm.h>
12
13#include "trace_output.h"
14
15/* must be a power of 2 */
16#define EVENT_HASHSIZE 128
17
18DECLARE_RWSEM(trace_event_sem);
19
20static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
21
22static int next_event_type = __TRACE_LAST_TYPE + 1;
23
24enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
25{
26 struct trace_seq *s = &iter->seq;
27 struct trace_entry *entry = iter->ent;
28 struct bputs_entry *field;
29
30 trace_assign_type(field, entry);
31
32 trace_seq_puts(s, field->str);
33
34 return trace_handle_return(s);
35}
36
37enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
38{
39 struct trace_seq *s = &iter->seq;
40 struct trace_entry *entry = iter->ent;
41 struct bprint_entry *field;
42
43 trace_assign_type(field, entry);
44
45 trace_seq_bprintf(s, field->fmt, field->buf);
46
47 return trace_handle_return(s);
48}
49
50enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
51{
52 struct trace_seq *s = &iter->seq;
53 struct trace_entry *entry = iter->ent;
54 struct print_entry *field;
55
56 trace_assign_type(field, entry);
57
58 trace_seq_puts(s, field->buf);
59
60 return trace_handle_return(s);
61}
62
63const char *
64trace_print_flags_seq(struct trace_seq *p, const char *delim,
65 unsigned long flags,
66 const struct trace_print_flags *flag_array)
67{
68 unsigned long mask;
69 const char *str;
70 const char *ret = trace_seq_buffer_ptr(p);
71 int i, first = 1;
72
73 for (i = 0; flag_array[i].name && flags; i++) {
74
75 mask = flag_array[i].mask;
76 if ((flags & mask) != mask)
77 continue;
78
79 str = flag_array[i].name;
80 flags &= ~mask;
81 if (!first && delim)
82 trace_seq_puts(p, delim);
83 else
84 first = 0;
85 trace_seq_puts(p, str);
86 }
87
88 /* check for left over flags */
89 if (flags) {
90 if (!first && delim)
91 trace_seq_puts(p, delim);
92 trace_seq_printf(p, "0x%lx", flags);
93 }
94
95 trace_seq_putc(p, 0);
96
97 return ret;
98}
99EXPORT_SYMBOL(trace_print_flags_seq);
100
101const char *
102trace_print_symbols_seq(struct trace_seq *p, unsigned long val,
103 const struct trace_print_flags *symbol_array)
104{
105 int i;
106 const char *ret = trace_seq_buffer_ptr(p);
107
108 for (i = 0; symbol_array[i].name; i++) {
109
110 if (val != symbol_array[i].mask)
111 continue;
112
113 trace_seq_puts(p, symbol_array[i].name);
114 break;
115 }
116
117 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
118 trace_seq_printf(p, "0x%lx", val);
119
120 trace_seq_putc(p, 0);
121
122 return ret;
123}
124EXPORT_SYMBOL(trace_print_symbols_seq);
125
126#if BITS_PER_LONG == 32
127const char *
128trace_print_flags_seq_u64(struct trace_seq *p, const char *delim,
129 unsigned long long flags,
130 const struct trace_print_flags_u64 *flag_array)
131{
132 unsigned long long mask;
133 const char *str;
134 const char *ret = trace_seq_buffer_ptr(p);
135 int i, first = 1;
136
137 for (i = 0; flag_array[i].name && flags; i++) {
138
139 mask = flag_array[i].mask;
140 if ((flags & mask) != mask)
141 continue;
142
143 str = flag_array[i].name;
144 flags &= ~mask;
145 if (!first && delim)
146 trace_seq_puts(p, delim);
147 else
148 first = 0;
149 trace_seq_puts(p, str);
150 }
151
152 /* check for left over flags */
153 if (flags) {
154 if (!first && delim)
155 trace_seq_puts(p, delim);
156 trace_seq_printf(p, "0x%llx", flags);
157 }
158
159 trace_seq_putc(p, 0);
160
161 return ret;
162}
163EXPORT_SYMBOL(trace_print_flags_seq_u64);
164
165const char *
166trace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
167 const struct trace_print_flags_u64 *symbol_array)
168{
169 int i;
170 const char *ret = trace_seq_buffer_ptr(p);
171
172 for (i = 0; symbol_array[i].name; i++) {
173
174 if (val != symbol_array[i].mask)
175 continue;
176
177 trace_seq_puts(p, symbol_array[i].name);
178 break;
179 }
180
181 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
182 trace_seq_printf(p, "0x%llx", val);
183
184 trace_seq_putc(p, 0);
185
186 return ret;
187}
188EXPORT_SYMBOL(trace_print_symbols_seq_u64);
189#endif
190
191const char *
192trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
193 unsigned int bitmask_size)
194{
195 const char *ret = trace_seq_buffer_ptr(p);
196
197 trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8);
198 trace_seq_putc(p, 0);
199
200 return ret;
201}
202EXPORT_SYMBOL_GPL(trace_print_bitmask_seq);
203
204/**
205 * trace_print_hex_seq - print buffer as hex sequence
206 * @p: trace seq struct to write to
207 * @buf: The buffer to print
208 * @buf_len: Length of @buf in bytes
209 * @concatenate: Print @buf as single hex string or with spacing
210 *
211 * Prints the passed buffer as a hex sequence either as a whole,
212 * single hex string if @concatenate is true or with spacing after
213 * each byte in case @concatenate is false.
214 */
215const char *
216trace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len,
217 bool concatenate)
218{
219 int i;
220 const char *ret = trace_seq_buffer_ptr(p);
221
222 for (i = 0; i < buf_len; i++)
223 trace_seq_printf(p, "%s%2.2x", concatenate || i == 0 ? "" : " ",
224 buf[i]);
225 trace_seq_putc(p, 0);
226
227 return ret;
228}
229EXPORT_SYMBOL(trace_print_hex_seq);
230
231const char *
232trace_print_array_seq(struct trace_seq *p, const void *buf, int count,
233 size_t el_size)
234{
235 const char *ret = trace_seq_buffer_ptr(p);
236 const char *prefix = "";
237 void *ptr = (void *)buf;
238 size_t buf_len = count * el_size;
239
240 trace_seq_putc(p, '{');
241
242 while (ptr < buf + buf_len) {
243 switch (el_size) {
244 case 1:
245 trace_seq_printf(p, "%s0x%x", prefix,
246 *(u8 *)ptr);
247 break;
248 case 2:
249 trace_seq_printf(p, "%s0x%x", prefix,
250 *(u16 *)ptr);
251 break;
252 case 4:
253 trace_seq_printf(p, "%s0x%x", prefix,
254 *(u32 *)ptr);
255 break;
256 case 8:
257 trace_seq_printf(p, "%s0x%llx", prefix,
258 *(u64 *)ptr);
259 break;
260 default:
261 trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
262 *(u8 *)ptr);
263 el_size = 1;
264 }
265 prefix = ",";
266 ptr += el_size;
267 }
268
269 trace_seq_putc(p, '}');
270 trace_seq_putc(p, 0);
271
272 return ret;
273}
274EXPORT_SYMBOL(trace_print_array_seq);
275
276int trace_raw_output_prep(struct trace_iterator *iter,
277 struct trace_event *trace_event)
278{
279 struct trace_event_call *event;
280 struct trace_seq *s = &iter->seq;
281 struct trace_seq *p = &iter->tmp_seq;
282 struct trace_entry *entry;
283
284 event = container_of(trace_event, struct trace_event_call, event);
285 entry = iter->ent;
286
287 if (entry->type != event->event.type) {
288 WARN_ON_ONCE(1);
289 return TRACE_TYPE_UNHANDLED;
290 }
291
292 trace_seq_init(p);
293 trace_seq_printf(s, "%s: ", trace_event_name(event));
294
295 return trace_handle_return(s);
296}
297EXPORT_SYMBOL(trace_raw_output_prep);
298
299static int trace_output_raw(struct trace_iterator *iter, char *name,
300 char *fmt, va_list ap)
301{
302 struct trace_seq *s = &iter->seq;
303
304 trace_seq_printf(s, "%s: ", name);
305 trace_seq_vprintf(s, fmt, ap);
306
307 return trace_handle_return(s);
308}
309
310int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
311{
312 va_list ap;
313 int ret;
314
315 va_start(ap, fmt);
316 ret = trace_output_raw(iter, name, fmt, ap);
317 va_end(ap);
318
319 return ret;
320}
321EXPORT_SYMBOL_GPL(trace_output_call);
322
323#ifdef CONFIG_KRETPROBES
324static inline const char *kretprobed(const char *name)
325{
326 static const char tramp_name[] = "kretprobe_trampoline";
327 int size = sizeof(tramp_name);
328
329 if (strncmp(tramp_name, name, size) == 0)
330 return "[unknown/kretprobe'd]";
331 return name;
332}
333#else
334static inline const char *kretprobed(const char *name)
335{
336 return name;
337}
338#endif /* CONFIG_KRETPROBES */
339
340static void
341seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
342{
343 char str[KSYM_SYMBOL_LEN];
344#ifdef CONFIG_KALLSYMS
345 const char *name;
346
347 kallsyms_lookup(address, NULL, NULL, NULL, str);
348
349 name = kretprobed(str);
350
351 if (name && strlen(name)) {
352 trace_seq_printf(s, fmt, name);
353 return;
354 }
355#endif
356 snprintf(str, KSYM_SYMBOL_LEN, "0x%08lx", address);
357 trace_seq_printf(s, fmt, str);
358}
359
360static void
361seq_print_sym_offset(struct trace_seq *s, const char *fmt,
362 unsigned long address)
363{
364 char str[KSYM_SYMBOL_LEN];
365#ifdef CONFIG_KALLSYMS
366 const char *name;
367
368 sprint_symbol(str, address);
369 name = kretprobed(str);
370
371 if (name && strlen(name)) {
372 trace_seq_printf(s, fmt, name);
373 return;
374 }
375#endif
376 snprintf(str, KSYM_SYMBOL_LEN, "0x%08lx", address);
377 trace_seq_printf(s, fmt, str);
378}
379
380#ifndef CONFIG_64BIT
381# define IP_FMT "%08lx"
382#else
383# define IP_FMT "%016lx"
384#endif
385
386static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
387 unsigned long ip, unsigned long sym_flags)
388{
389 struct file *file = NULL;
390 unsigned long vmstart = 0;
391 int ret = 1;
392
393 if (s->full)
394 return 0;
395
396 if (mm) {
397 const struct vm_area_struct *vma;
398
399 down_read(&mm->mmap_sem);
400 vma = find_vma(mm, ip);
401 if (vma) {
402 file = vma->vm_file;
403 vmstart = vma->vm_start;
404 }
405 if (file) {
406 ret = trace_seq_path(s, &file->f_path);
407 if (ret)
408 trace_seq_printf(s, "[+0x%lx]",
409 ip - vmstart);
410 }
411 up_read(&mm->mmap_sem);
412 }
413 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
414 trace_seq_printf(s, " <" IP_FMT ">", ip);
415 return !trace_seq_has_overflowed(s);
416}
417
418int
419seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
420{
421 if (!ip) {
422 trace_seq_putc(s, '0');
423 goto out;
424 }
425
426 if (sym_flags & TRACE_ITER_SYM_OFFSET)
427 seq_print_sym_offset(s, "%s", ip);
428 else
429 seq_print_sym_short(s, "%s", ip);
430
431 if (sym_flags & TRACE_ITER_SYM_ADDR)
432 trace_seq_printf(s, " <" IP_FMT ">", ip);
433
434 out:
435 return !trace_seq_has_overflowed(s);
436}
437
438/**
439 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
440 * @s: trace seq struct to write to
441 * @entry: The trace entry field from the ring buffer
442 *
443 * Prints the generic fields of irqs off, in hard or softirq, preempt
444 * count.
445 */
446int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
447{
448 char hardsoft_irq;
449 char need_resched;
450 char irqs_off;
451 int hardirq;
452 int softirq;
453 int nmi;
454
455 nmi = entry->flags & TRACE_FLAG_NMI;
456 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
457 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
458
459 irqs_off =
460 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
461 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
462 '.';
463
464 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
465 TRACE_FLAG_PREEMPT_RESCHED)) {
466 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
467 need_resched = 'N';
468 break;
469 case TRACE_FLAG_NEED_RESCHED:
470 need_resched = 'n';
471 break;
472 case TRACE_FLAG_PREEMPT_RESCHED:
473 need_resched = 'p';
474 break;
475 default:
476 need_resched = '.';
477 break;
478 }
479
480 hardsoft_irq =
481 (nmi && hardirq) ? 'Z' :
482 nmi ? 'z' :
483 (hardirq && softirq) ? 'H' :
484 hardirq ? 'h' :
485 softirq ? 's' :
486 '.' ;
487
488 trace_seq_printf(s, "%c%c%c",
489 irqs_off, need_resched, hardsoft_irq);
490
491 if (entry->preempt_count)
492 trace_seq_printf(s, "%x", entry->preempt_count);
493 else
494 trace_seq_putc(s, '.');
495
496 return !trace_seq_has_overflowed(s);
497}
498
499static int
500lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
501{
502 char comm[TASK_COMM_LEN];
503
504 trace_find_cmdline(entry->pid, comm);
505
506 trace_seq_printf(s, "%8.8s-%-5d %3d",
507 comm, entry->pid, cpu);
508
509 return trace_print_lat_fmt(s, entry);
510}
511
512#undef MARK
513#define MARK(v, s) {.val = v, .sym = s}
514/* trace overhead mark */
515static const struct trace_mark {
516 unsigned long long val; /* unit: nsec */
517 char sym;
518} mark[] = {
519 MARK(1000000000ULL , '$'), /* 1 sec */
520 MARK(100000000ULL , '@'), /* 100 msec */
521 MARK(10000000ULL , '*'), /* 10 msec */
522 MARK(1000000ULL , '#'), /* 1000 usecs */
523 MARK(100000ULL , '!'), /* 100 usecs */
524 MARK(10000ULL , '+'), /* 10 usecs */
525};
526#undef MARK
527
528char trace_find_mark(unsigned long long d)
529{
530 int i;
531 int size = ARRAY_SIZE(mark);
532
533 for (i = 0; i < size; i++) {
534 if (d > mark[i].val)
535 break;
536 }
537
538 return (i == size) ? ' ' : mark[i].sym;
539}
540
541static int
542lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
543{
544 struct trace_array *tr = iter->tr;
545 unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
546 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
547 unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start;
548 unsigned long long rel_ts = next_ts - iter->ts;
549 struct trace_seq *s = &iter->seq;
550
551 if (in_ns) {
552 abs_ts = ns2usecs(abs_ts);
553 rel_ts = ns2usecs(rel_ts);
554 }
555
556 if (verbose && in_ns) {
557 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
558 unsigned long abs_msec = (unsigned long)abs_ts;
559 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
560 unsigned long rel_msec = (unsigned long)rel_ts;
561
562 trace_seq_printf(
563 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
564 ns2usecs(iter->ts),
565 abs_msec, abs_usec,
566 rel_msec, rel_usec);
567
568 } else if (verbose && !in_ns) {
569 trace_seq_printf(
570 s, "[%016llx] %lld (+%lld): ",
571 iter->ts, abs_ts, rel_ts);
572
573 } else if (!verbose && in_ns) {
574 trace_seq_printf(
575 s, " %4lldus%c: ",
576 abs_ts,
577 trace_find_mark(rel_ts * NSEC_PER_USEC));
578
579 } else { /* !verbose && !in_ns */
580 trace_seq_printf(s, " %4lld: ", abs_ts);
581 }
582
583 return !trace_seq_has_overflowed(s);
584}
585
586int trace_print_context(struct trace_iterator *iter)
587{
588 struct trace_array *tr = iter->tr;
589 struct trace_seq *s = &iter->seq;
590 struct trace_entry *entry = iter->ent;
591 unsigned long long t;
592 unsigned long secs, usec_rem;
593 char comm[TASK_COMM_LEN];
594
595 trace_find_cmdline(entry->pid, comm);
596
597 trace_seq_printf(s, "%16s-%-5d [%03d] ",
598 comm, entry->pid, iter->cpu);
599
600 if (tr->trace_flags & TRACE_ITER_RECORD_TGID) {
601 unsigned int tgid = trace_find_tgid(entry->pid);
602
603 if (!tgid)
604 trace_seq_printf(s, "(-----) ");
605 else
606 trace_seq_printf(s, "(%5d) ", tgid);
607 }
608
609 if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
610 trace_print_lat_fmt(s, entry);
611
612 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
613 t = ns2usecs(iter->ts);
614 usec_rem = do_div(t, USEC_PER_SEC);
615 secs = (unsigned long)t;
616 trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
617 } else
618 trace_seq_printf(s, " %12llu: ", iter->ts);
619
620 return !trace_seq_has_overflowed(s);
621}
622
623int trace_print_lat_context(struct trace_iterator *iter)
624{
625 struct trace_array *tr = iter->tr;
626 /* trace_find_next_entry will reset ent_size */
627 int ent_size = iter->ent_size;
628 struct trace_seq *s = &iter->seq;
629 u64 next_ts;
630 struct trace_entry *entry = iter->ent,
631 *next_entry = trace_find_next_entry(iter, NULL,
632 &next_ts);
633 unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
634
635 /* Restore the original ent_size */
636 iter->ent_size = ent_size;
637
638 if (!next_entry)
639 next_ts = iter->ts;
640
641 if (verbose) {
642 char comm[TASK_COMM_LEN];
643
644 trace_find_cmdline(entry->pid, comm);
645
646 trace_seq_printf(
647 s, "%16s %5d %3d %d %08x %08lx ",
648 comm, entry->pid, iter->cpu, entry->flags,
649 entry->preempt_count, iter->idx);
650 } else {
651 lat_print_generic(s, entry, iter->cpu);
652 }
653
654 lat_print_timestamp(iter, next_ts);
655
656 return !trace_seq_has_overflowed(s);
657}
658
659/**
660 * ftrace_find_event - find a registered event
661 * @type: the type of event to look for
662 *
663 * Returns an event of type @type otherwise NULL
664 * Called with trace_event_read_lock() held.
665 */
666struct trace_event *ftrace_find_event(int type)
667{
668 struct trace_event *event;
669 unsigned key;
670
671 key = type & (EVENT_HASHSIZE - 1);
672
673 hlist_for_each_entry(event, &event_hash[key], node) {
674 if (event->type == type)
675 return event;
676 }
677
678 return NULL;
679}
680
681static LIST_HEAD(ftrace_event_list);
682
683static int trace_search_list(struct list_head **list)
684{
685 struct trace_event *e;
686 int last = __TRACE_LAST_TYPE;
687
688 if (list_empty(&ftrace_event_list)) {
689 *list = &ftrace_event_list;
690 return last + 1;
691 }
692
693 /*
694 * We used up all possible max events,
695 * lets see if somebody freed one.
696 */
697 list_for_each_entry(e, &ftrace_event_list, list) {
698 if (e->type != last + 1)
699 break;
700 last++;
701 }
702
703 /* Did we used up all 65 thousand events??? */
704 if ((last + 1) > TRACE_EVENT_TYPE_MAX)
705 return 0;
706
707 *list = &e->list;
708 return last + 1;
709}
710
711void trace_event_read_lock(void)
712{
713 down_read(&trace_event_sem);
714}
715
716void trace_event_read_unlock(void)
717{
718 up_read(&trace_event_sem);
719}
720
721/**
722 * register_trace_event - register output for an event type
723 * @event: the event type to register
724 *
725 * Event types are stored in a hash and this hash is used to
726 * find a way to print an event. If the @event->type is set
727 * then it will use that type, otherwise it will assign a
728 * type to use.
729 *
730 * If you assign your own type, please make sure it is added
731 * to the trace_type enum in trace.h, to avoid collisions
732 * with the dynamic types.
733 *
734 * Returns the event type number or zero on error.
735 */
736int register_trace_event(struct trace_event *event)
737{
738 unsigned key;
739 int ret = 0;
740
741 down_write(&trace_event_sem);
742
743 if (WARN_ON(!event))
744 goto out;
745
746 if (WARN_ON(!event->funcs))
747 goto out;
748
749 INIT_LIST_HEAD(&event->list);
750
751 if (!event->type) {
752 struct list_head *list = NULL;
753
754 if (next_event_type > TRACE_EVENT_TYPE_MAX) {
755
756 event->type = trace_search_list(&list);
757 if (!event->type)
758 goto out;
759
760 } else {
761
762 event->type = next_event_type++;
763 list = &ftrace_event_list;
764 }
765
766 if (WARN_ON(ftrace_find_event(event->type)))
767 goto out;
768
769 list_add_tail(&event->list, list);
770
771 } else if (event->type > __TRACE_LAST_TYPE) {
772 printk(KERN_WARNING "Need to add type to trace.h\n");
773 WARN_ON(1);
774 goto out;
775 } else {
776 /* Is this event already used */
777 if (ftrace_find_event(event->type))
778 goto out;
779 }
780
781 if (event->funcs->trace == NULL)
782 event->funcs->trace = trace_nop_print;
783 if (event->funcs->raw == NULL)
784 event->funcs->raw = trace_nop_print;
785 if (event->funcs->hex == NULL)
786 event->funcs->hex = trace_nop_print;
787 if (event->funcs->binary == NULL)
788 event->funcs->binary = trace_nop_print;
789
790 key = event->type & (EVENT_HASHSIZE - 1);
791
792 hlist_add_head(&event->node, &event_hash[key]);
793
794 ret = event->type;
795 out:
796 up_write(&trace_event_sem);
797
798 return ret;
799}
800EXPORT_SYMBOL_GPL(register_trace_event);
801
802/*
803 * Used by module code with the trace_event_sem held for write.
804 */
805int __unregister_trace_event(struct trace_event *event)
806{
807 hlist_del(&event->node);
808 list_del(&event->list);
809 return 0;
810}
811
812/**
813 * unregister_trace_event - remove a no longer used event
814 * @event: the event to remove
815 */
816int unregister_trace_event(struct trace_event *event)
817{
818 down_write(&trace_event_sem);
819 __unregister_trace_event(event);
820 up_write(&trace_event_sem);
821
822 return 0;
823}
824EXPORT_SYMBOL_GPL(unregister_trace_event);
825
826/*
827 * Standard events
828 */
829
830enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
831 struct trace_event *event)
832{
833 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
834
835 return trace_handle_return(&iter->seq);
836}
837
838/* TRACE_FN */
839static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
840 struct trace_event *event)
841{
842 struct ftrace_entry *field;
843 struct trace_seq *s = &iter->seq;
844
845 trace_assign_type(field, iter->ent);
846
847 seq_print_ip_sym(s, field->ip, flags);
848
849 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
850 trace_seq_puts(s, " <-");
851 seq_print_ip_sym(s, field->parent_ip, flags);
852 }
853
854 trace_seq_putc(s, '\n');
855
856 return trace_handle_return(s);
857}
858
859static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
860 struct trace_event *event)
861{
862 struct ftrace_entry *field;
863
864 trace_assign_type(field, iter->ent);
865
866 trace_seq_printf(&iter->seq, "%lx %lx\n",
867 field->ip,
868 field->parent_ip);
869
870 return trace_handle_return(&iter->seq);
871}
872
873static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
874 struct trace_event *event)
875{
876 struct ftrace_entry *field;
877 struct trace_seq *s = &iter->seq;
878
879 trace_assign_type(field, iter->ent);
880
881 SEQ_PUT_HEX_FIELD(s, field->ip);
882 SEQ_PUT_HEX_FIELD(s, field->parent_ip);
883
884 return trace_handle_return(s);
885}
886
887static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
888 struct trace_event *event)
889{
890 struct ftrace_entry *field;
891 struct trace_seq *s = &iter->seq;
892
893 trace_assign_type(field, iter->ent);
894
895 SEQ_PUT_FIELD(s, field->ip);
896 SEQ_PUT_FIELD(s, field->parent_ip);
897
898 return trace_handle_return(s);
899}
900
901static struct trace_event_functions trace_fn_funcs = {
902 .trace = trace_fn_trace,
903 .raw = trace_fn_raw,
904 .hex = trace_fn_hex,
905 .binary = trace_fn_bin,
906};
907
908static struct trace_event trace_fn_event = {
909 .type = TRACE_FN,
910 .funcs = &trace_fn_funcs,
911};
912
913/* TRACE_CTX an TRACE_WAKE */
914static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
915 char *delim)
916{
917 struct ctx_switch_entry *field;
918 char comm[TASK_COMM_LEN];
919 int S, T;
920
921
922 trace_assign_type(field, iter->ent);
923
924 T = task_index_to_char(field->next_state);
925 S = task_index_to_char(field->prev_state);
926 trace_find_cmdline(field->next_pid, comm);
927 trace_seq_printf(&iter->seq,
928 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
929 field->prev_pid,
930 field->prev_prio,
931 S, delim,
932 field->next_cpu,
933 field->next_pid,
934 field->next_prio,
935 T, comm);
936
937 return trace_handle_return(&iter->seq);
938}
939
940static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
941 struct trace_event *event)
942{
943 return trace_ctxwake_print(iter, "==>");
944}
945
946static enum print_line_t trace_wake_print(struct trace_iterator *iter,
947 int flags, struct trace_event *event)
948{
949 return trace_ctxwake_print(iter, " +");
950}
951
952static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
953{
954 struct ctx_switch_entry *field;
955 int T;
956
957 trace_assign_type(field, iter->ent);
958
959 if (!S)
960 S = task_index_to_char(field->prev_state);
961 T = task_index_to_char(field->next_state);
962 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
963 field->prev_pid,
964 field->prev_prio,
965 S,
966 field->next_cpu,
967 field->next_pid,
968 field->next_prio,
969 T);
970
971 return trace_handle_return(&iter->seq);
972}
973
974static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
975 struct trace_event *event)
976{
977 return trace_ctxwake_raw(iter, 0);
978}
979
980static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
981 struct trace_event *event)
982{
983 return trace_ctxwake_raw(iter, '+');
984}
985
986
987static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
988{
989 struct ctx_switch_entry *field;
990 struct trace_seq *s = &iter->seq;
991 int T;
992
993 trace_assign_type(field, iter->ent);
994
995 if (!S)
996 S = task_index_to_char(field->prev_state);
997 T = task_index_to_char(field->next_state);
998
999 SEQ_PUT_HEX_FIELD(s, field->prev_pid);
1000 SEQ_PUT_HEX_FIELD(s, field->prev_prio);
1001 SEQ_PUT_HEX_FIELD(s, S);
1002 SEQ_PUT_HEX_FIELD(s, field->next_cpu);
1003 SEQ_PUT_HEX_FIELD(s, field->next_pid);
1004 SEQ_PUT_HEX_FIELD(s, field->next_prio);
1005 SEQ_PUT_HEX_FIELD(s, T);
1006
1007 return trace_handle_return(s);
1008}
1009
1010static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1011 struct trace_event *event)
1012{
1013 return trace_ctxwake_hex(iter, 0);
1014}
1015
1016static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1017 struct trace_event *event)
1018{
1019 return trace_ctxwake_hex(iter, '+');
1020}
1021
1022static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1023 int flags, struct trace_event *event)
1024{
1025 struct ctx_switch_entry *field;
1026 struct trace_seq *s = &iter->seq;
1027
1028 trace_assign_type(field, iter->ent);
1029
1030 SEQ_PUT_FIELD(s, field->prev_pid);
1031 SEQ_PUT_FIELD(s, field->prev_prio);
1032 SEQ_PUT_FIELD(s, field->prev_state);
1033 SEQ_PUT_FIELD(s, field->next_cpu);
1034 SEQ_PUT_FIELD(s, field->next_pid);
1035 SEQ_PUT_FIELD(s, field->next_prio);
1036 SEQ_PUT_FIELD(s, field->next_state);
1037
1038 return trace_handle_return(s);
1039}
1040
1041static struct trace_event_functions trace_ctx_funcs = {
1042 .trace = trace_ctx_print,
1043 .raw = trace_ctx_raw,
1044 .hex = trace_ctx_hex,
1045 .binary = trace_ctxwake_bin,
1046};
1047
1048static struct trace_event trace_ctx_event = {
1049 .type = TRACE_CTX,
1050 .funcs = &trace_ctx_funcs,
1051};
1052
1053static struct trace_event_functions trace_wake_funcs = {
1054 .trace = trace_wake_print,
1055 .raw = trace_wake_raw,
1056 .hex = trace_wake_hex,
1057 .binary = trace_ctxwake_bin,
1058};
1059
1060static struct trace_event trace_wake_event = {
1061 .type = TRACE_WAKE,
1062 .funcs = &trace_wake_funcs,
1063};
1064
1065/* TRACE_STACK */
1066
1067static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1068 int flags, struct trace_event *event)
1069{
1070 struct stack_entry *field;
1071 struct trace_seq *s = &iter->seq;
1072 unsigned long *p;
1073 unsigned long *end;
1074
1075 trace_assign_type(field, iter->ent);
1076 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1077
1078 trace_seq_puts(s, "<stack trace>\n");
1079
1080 for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1081
1082 if (trace_seq_has_overflowed(s))
1083 break;
1084
1085 trace_seq_puts(s, " => ");
1086 seq_print_ip_sym(s, *p, flags);
1087 trace_seq_putc(s, '\n');
1088 }
1089
1090 return trace_handle_return(s);
1091}
1092
1093static struct trace_event_functions trace_stack_funcs = {
1094 .trace = trace_stack_print,
1095};
1096
1097static struct trace_event trace_stack_event = {
1098 .type = TRACE_STACK,
1099 .funcs = &trace_stack_funcs,
1100};
1101
1102/* TRACE_USER_STACK */
1103static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1104 int flags, struct trace_event *event)
1105{
1106 struct trace_array *tr = iter->tr;
1107 struct userstack_entry *field;
1108 struct trace_seq *s = &iter->seq;
1109 struct mm_struct *mm = NULL;
1110 unsigned int i;
1111
1112 trace_assign_type(field, iter->ent);
1113
1114 trace_seq_puts(s, "<user stack trace>\n");
1115
1116 if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
1117 struct task_struct *task;
1118 /*
1119 * we do the lookup on the thread group leader,
1120 * since individual threads might have already quit!
1121 */
1122 rcu_read_lock();
1123 task = find_task_by_vpid(field->tgid);
1124 if (task)
1125 mm = get_task_mm(task);
1126 rcu_read_unlock();
1127 }
1128
1129 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1130 unsigned long ip = field->caller[i];
1131
1132 if (ip == ULONG_MAX || trace_seq_has_overflowed(s))
1133 break;
1134
1135 trace_seq_puts(s, " => ");
1136
1137 if (!ip) {
1138 trace_seq_puts(s, "??");
1139 trace_seq_putc(s, '\n');
1140 continue;
1141 }
1142
1143 seq_print_user_ip(s, mm, ip, flags);
1144 trace_seq_putc(s, '\n');
1145 }
1146
1147 if (mm)
1148 mmput(mm);
1149
1150 return trace_handle_return(s);
1151}
1152
1153static struct trace_event_functions trace_user_stack_funcs = {
1154 .trace = trace_user_stack_print,
1155};
1156
1157static struct trace_event trace_user_stack_event = {
1158 .type = TRACE_USER_STACK,
1159 .funcs = &trace_user_stack_funcs,
1160};
1161
1162/* TRACE_HWLAT */
1163static enum print_line_t
1164trace_hwlat_print(struct trace_iterator *iter, int flags,
1165 struct trace_event *event)
1166{
1167 struct trace_entry *entry = iter->ent;
1168 struct trace_seq *s = &iter->seq;
1169 struct hwlat_entry *field;
1170
1171 trace_assign_type(field, entry);
1172
1173 trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld",
1174 field->seqnum,
1175 field->duration,
1176 field->outer_duration,
1177 (long long)field->timestamp.tv_sec,
1178 field->timestamp.tv_nsec);
1179
1180 if (field->nmi_count) {
1181 /*
1182 * The generic sched_clock() is not NMI safe, thus
1183 * we only record the count and not the time.
1184 */
1185 if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK))
1186 trace_seq_printf(s, " nmi-total:%llu",
1187 field->nmi_total_ts);
1188 trace_seq_printf(s, " nmi-count:%u",
1189 field->nmi_count);
1190 }
1191
1192 trace_seq_putc(s, '\n');
1193
1194 return trace_handle_return(s);
1195}
1196
1197
1198static enum print_line_t
1199trace_hwlat_raw(struct trace_iterator *iter, int flags,
1200 struct trace_event *event)
1201{
1202 struct hwlat_entry *field;
1203 struct trace_seq *s = &iter->seq;
1204
1205 trace_assign_type(field, iter->ent);
1206
1207 trace_seq_printf(s, "%llu %lld %lld %09ld %u\n",
1208 field->duration,
1209 field->outer_duration,
1210 (long long)field->timestamp.tv_sec,
1211 field->timestamp.tv_nsec,
1212 field->seqnum);
1213
1214 return trace_handle_return(s);
1215}
1216
1217static struct trace_event_functions trace_hwlat_funcs = {
1218 .trace = trace_hwlat_print,
1219 .raw = trace_hwlat_raw,
1220};
1221
1222static struct trace_event trace_hwlat_event = {
1223 .type = TRACE_HWLAT,
1224 .funcs = &trace_hwlat_funcs,
1225};
1226
1227/* TRACE_BPUTS */
1228static enum print_line_t
1229trace_bputs_print(struct trace_iterator *iter, int flags,
1230 struct trace_event *event)
1231{
1232 struct trace_entry *entry = iter->ent;
1233 struct trace_seq *s = &iter->seq;
1234 struct bputs_entry *field;
1235
1236 trace_assign_type(field, entry);
1237
1238 seq_print_ip_sym(s, field->ip, flags);
1239 trace_seq_puts(s, ": ");
1240 trace_seq_puts(s, field->str);
1241
1242 return trace_handle_return(s);
1243}
1244
1245
1246static enum print_line_t
1247trace_bputs_raw(struct trace_iterator *iter, int flags,
1248 struct trace_event *event)
1249{
1250 struct bputs_entry *field;
1251 struct trace_seq *s = &iter->seq;
1252
1253 trace_assign_type(field, iter->ent);
1254
1255 trace_seq_printf(s, ": %lx : ", field->ip);
1256 trace_seq_puts(s, field->str);
1257
1258 return trace_handle_return(s);
1259}
1260
1261static struct trace_event_functions trace_bputs_funcs = {
1262 .trace = trace_bputs_print,
1263 .raw = trace_bputs_raw,
1264};
1265
1266static struct trace_event trace_bputs_event = {
1267 .type = TRACE_BPUTS,
1268 .funcs = &trace_bputs_funcs,
1269};
1270
1271/* TRACE_BPRINT */
1272static enum print_line_t
1273trace_bprint_print(struct trace_iterator *iter, int flags,
1274 struct trace_event *event)
1275{
1276 struct trace_entry *entry = iter->ent;
1277 struct trace_seq *s = &iter->seq;
1278 struct bprint_entry *field;
1279
1280 trace_assign_type(field, entry);
1281
1282 seq_print_ip_sym(s, field->ip, flags);
1283 trace_seq_puts(s, ": ");
1284 trace_seq_bprintf(s, field->fmt, field->buf);
1285
1286 return trace_handle_return(s);
1287}
1288
1289
1290static enum print_line_t
1291trace_bprint_raw(struct trace_iterator *iter, int flags,
1292 struct trace_event *event)
1293{
1294 struct bprint_entry *field;
1295 struct trace_seq *s = &iter->seq;
1296
1297 trace_assign_type(field, iter->ent);
1298
1299 trace_seq_printf(s, ": %lx : ", field->ip);
1300 trace_seq_bprintf(s, field->fmt, field->buf);
1301
1302 return trace_handle_return(s);
1303}
1304
1305static struct trace_event_functions trace_bprint_funcs = {
1306 .trace = trace_bprint_print,
1307 .raw = trace_bprint_raw,
1308};
1309
1310static struct trace_event trace_bprint_event = {
1311 .type = TRACE_BPRINT,
1312 .funcs = &trace_bprint_funcs,
1313};
1314
1315/* TRACE_PRINT */
1316static enum print_line_t trace_print_print(struct trace_iterator *iter,
1317 int flags, struct trace_event *event)
1318{
1319 struct print_entry *field;
1320 struct trace_seq *s = &iter->seq;
1321
1322 trace_assign_type(field, iter->ent);
1323
1324 seq_print_ip_sym(s, field->ip, flags);
1325 trace_seq_printf(s, ": %s", field->buf);
1326
1327 return trace_handle_return(s);
1328}
1329
1330static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1331 struct trace_event *event)
1332{
1333 struct print_entry *field;
1334
1335 trace_assign_type(field, iter->ent);
1336
1337 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1338
1339 return trace_handle_return(&iter->seq);
1340}
1341
1342static struct trace_event_functions trace_print_funcs = {
1343 .trace = trace_print_print,
1344 .raw = trace_print_raw,
1345};
1346
1347static struct trace_event trace_print_event = {
1348 .type = TRACE_PRINT,
1349 .funcs = &trace_print_funcs,
1350};
1351
1352static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags,
1353 struct trace_event *event)
1354{
1355 struct raw_data_entry *field;
1356 int i;
1357
1358 trace_assign_type(field, iter->ent);
1359
1360 trace_seq_printf(&iter->seq, "# %x buf:", field->id);
1361
1362 for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++)
1363 trace_seq_printf(&iter->seq, " %02x",
1364 (unsigned char)field->buf[i]);
1365
1366 trace_seq_putc(&iter->seq, '\n');
1367
1368 return trace_handle_return(&iter->seq);
1369}
1370
1371static struct trace_event_functions trace_raw_data_funcs = {
1372 .trace = trace_raw_data,
1373 .raw = trace_raw_data,
1374};
1375
1376static struct trace_event trace_raw_data_event = {
1377 .type = TRACE_RAW_DATA,
1378 .funcs = &trace_raw_data_funcs,
1379};
1380
1381
1382static struct trace_event *events[] __initdata = {
1383 &trace_fn_event,
1384 &trace_ctx_event,
1385 &trace_wake_event,
1386 &trace_stack_event,
1387 &trace_user_stack_event,
1388 &trace_bputs_event,
1389 &trace_bprint_event,
1390 &trace_print_event,
1391 &trace_hwlat_event,
1392 &trace_raw_data_event,
1393 NULL
1394};
1395
1396__init static int init_events(void)
1397{
1398 struct trace_event *event;
1399 int i, ret;
1400
1401 for (i = 0; events[i]; i++) {
1402 event = events[i];
1403
1404 ret = register_trace_event(event);
1405 if (!ret) {
1406 printk(KERN_WARNING "event %d failed to register\n",
1407 event->type);
1408 WARN_ON_ONCE(1);
1409 }
1410 }
1411
1412 return 0;
1413}
1414early_initcall(init_events);
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/kprobes.h>
12#include <linux/sched/clock.h>
13#include <linux/sched/mm.h>
14#include <linux/idr.h>
15
16#include "trace_output.h"
17
18/* must be a power of 2 */
19#define EVENT_HASHSIZE 128
20
21DECLARE_RWSEM(trace_event_sem);
22
23static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
24
25enum 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
38enum 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
51enum 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
64const char *
65trace_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}
100EXPORT_SYMBOL(trace_print_flags_seq);
101
102const char *
103trace_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}
125EXPORT_SYMBOL(trace_print_symbols_seq);
126
127#if BITS_PER_LONG == 32
128const char *
129trace_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}
164EXPORT_SYMBOL(trace_print_flags_seq_u64);
165
166const char *
167trace_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}
189EXPORT_SYMBOL(trace_print_symbols_seq_u64);
190#endif
191
192const char *
193trace_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}
203EXPORT_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 */
216const char *
217trace_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 if (!concatenate && i != 0)
226 trace_seq_putc(p, ' ');
227 trace_seq_printf(p, fmt, min(buf_len - i, 16), &buf[i]);
228 }
229 trace_seq_putc(p, 0);
230
231 return ret;
232}
233EXPORT_SYMBOL(trace_print_hex_seq);
234
235const char *
236trace_print_array_seq(struct trace_seq *p, const void *buf, int count,
237 size_t el_size)
238{
239 const char *ret = trace_seq_buffer_ptr(p);
240 const char *prefix = "";
241 void *ptr = (void *)buf;
242 size_t buf_len = count * el_size;
243
244 trace_seq_putc(p, '{');
245
246 while (ptr < buf + buf_len) {
247 switch (el_size) {
248 case 1:
249 trace_seq_printf(p, "%s0x%x", prefix,
250 *(u8 *)ptr);
251 break;
252 case 2:
253 trace_seq_printf(p, "%s0x%x", prefix,
254 *(u16 *)ptr);
255 break;
256 case 4:
257 trace_seq_printf(p, "%s0x%x", prefix,
258 *(u32 *)ptr);
259 break;
260 case 8:
261 trace_seq_printf(p, "%s0x%llx", prefix,
262 *(u64 *)ptr);
263 break;
264 default:
265 trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
266 *(u8 *)ptr);
267 el_size = 1;
268 }
269 prefix = ",";
270 ptr += el_size;
271 }
272
273 trace_seq_putc(p, '}');
274 trace_seq_putc(p, 0);
275
276 return ret;
277}
278EXPORT_SYMBOL(trace_print_array_seq);
279
280const char *
281trace_print_hex_dump_seq(struct trace_seq *p, const char *prefix_str,
282 int prefix_type, int rowsize, int groupsize,
283 const void *buf, size_t len, bool ascii)
284{
285 const char *ret = trace_seq_buffer_ptr(p);
286
287 trace_seq_putc(p, '\n');
288 trace_seq_hex_dump(p, prefix_str, prefix_type,
289 rowsize, groupsize, buf, len, ascii);
290 trace_seq_putc(p, 0);
291 return ret;
292}
293EXPORT_SYMBOL(trace_print_hex_dump_seq);
294
295int trace_raw_output_prep(struct trace_iterator *iter,
296 struct trace_event *trace_event)
297{
298 struct trace_event_call *event;
299 struct trace_seq *s = &iter->seq;
300 struct trace_seq *p = &iter->tmp_seq;
301 struct trace_entry *entry;
302
303 event = container_of(trace_event, struct trace_event_call, event);
304 entry = iter->ent;
305
306 if (entry->type != event->event.type) {
307 WARN_ON_ONCE(1);
308 return TRACE_TYPE_UNHANDLED;
309 }
310
311 trace_seq_init(p);
312 trace_seq_printf(s, "%s: ", trace_event_name(event));
313
314 return trace_handle_return(s);
315}
316EXPORT_SYMBOL(trace_raw_output_prep);
317
318void trace_event_printf(struct trace_iterator *iter, const char *fmt, ...)
319{
320 va_list ap;
321
322 va_start(ap, fmt);
323 trace_check_vprintf(iter, trace_event_format(iter, fmt), ap);
324 va_end(ap);
325}
326EXPORT_SYMBOL(trace_event_printf);
327
328static __printf(3, 0)
329int trace_output_raw(struct trace_iterator *iter, char *name,
330 char *fmt, va_list ap)
331{
332 struct trace_seq *s = &iter->seq;
333
334 trace_seq_printf(s, "%s: ", name);
335 trace_seq_vprintf(s, trace_event_format(iter, fmt), ap);
336
337 return trace_handle_return(s);
338}
339
340int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
341{
342 va_list ap;
343 int ret;
344
345 va_start(ap, fmt);
346 ret = trace_output_raw(iter, name, fmt, ap);
347 va_end(ap);
348
349 return ret;
350}
351EXPORT_SYMBOL_GPL(trace_output_call);
352
353static inline const char *kretprobed(const char *name, unsigned long addr)
354{
355 if (is_kretprobe_trampoline(addr))
356 return "[unknown/kretprobe'd]";
357 return name;
358}
359
360void
361trace_seq_print_sym(struct trace_seq *s, unsigned long address, bool offset)
362{
363#ifdef CONFIG_KALLSYMS
364 char str[KSYM_SYMBOL_LEN];
365 const char *name;
366
367 if (offset)
368 sprint_symbol(str, address);
369 else
370 kallsyms_lookup(address, NULL, NULL, NULL, str);
371 name = kretprobed(str, address);
372
373 if (name && strlen(name)) {
374 trace_seq_puts(s, name);
375 return;
376 }
377#endif
378 trace_seq_printf(s, "0x%08lx", address);
379}
380
381#ifndef CONFIG_64BIT
382# define IP_FMT "%08lx"
383#else
384# define IP_FMT "%016lx"
385#endif
386
387static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
388 unsigned long ip, unsigned long sym_flags)
389{
390 struct file *file = NULL;
391 unsigned long vmstart = 0;
392 int ret = 1;
393
394 if (s->full)
395 return 0;
396
397 if (mm) {
398 const struct vm_area_struct *vma;
399
400 mmap_read_lock(mm);
401 vma = find_vma(mm, ip);
402 if (vma) {
403 file = vma->vm_file;
404 vmstart = vma->vm_start;
405 }
406 if (file) {
407 ret = trace_seq_path(s, file_user_path(file));
408 if (ret)
409 trace_seq_printf(s, "[+0x%lx]",
410 ip - vmstart);
411 }
412 mmap_read_unlock(mm);
413 }
414 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
415 trace_seq_printf(s, " <" IP_FMT ">", ip);
416 return !trace_seq_has_overflowed(s);
417}
418
419int
420seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
421{
422 if (!ip) {
423 trace_seq_putc(s, '0');
424 goto out;
425 }
426
427 trace_seq_print_sym(s, ip, sym_flags & TRACE_ITER_SYM_OFFSET);
428
429 if (sym_flags & TRACE_ITER_SYM_ADDR)
430 trace_seq_printf(s, " <" IP_FMT ">", ip);
431
432 out:
433 return !trace_seq_has_overflowed(s);
434}
435
436/**
437 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
438 * @s: trace seq struct to write to
439 * @entry: The trace entry field from the ring buffer
440 *
441 * Prints the generic fields of irqs off, in hard or softirq, preempt
442 * count.
443 */
444int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
445{
446 char hardsoft_irq;
447 char need_resched;
448 char irqs_off;
449 int hardirq;
450 int softirq;
451 int bh_off;
452 int nmi;
453
454 nmi = entry->flags & TRACE_FLAG_NMI;
455 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
456 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
457 bh_off = entry->flags & TRACE_FLAG_BH_OFF;
458
459 irqs_off =
460 (entry->flags & TRACE_FLAG_IRQS_OFF && bh_off) ? 'D' :
461 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
462 bh_off ? 'b' :
463 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
464 '.';
465
466 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
467 TRACE_FLAG_PREEMPT_RESCHED)) {
468 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
469 need_resched = 'N';
470 break;
471 case TRACE_FLAG_NEED_RESCHED:
472 need_resched = 'n';
473 break;
474 case TRACE_FLAG_PREEMPT_RESCHED:
475 need_resched = 'p';
476 break;
477 default:
478 need_resched = '.';
479 break;
480 }
481
482 hardsoft_irq =
483 (nmi && hardirq) ? 'Z' :
484 nmi ? 'z' :
485 (hardirq && softirq) ? 'H' :
486 hardirq ? 'h' :
487 softirq ? 's' :
488 '.' ;
489
490 trace_seq_printf(s, "%c%c%c",
491 irqs_off, need_resched, hardsoft_irq);
492
493 if (entry->preempt_count & 0xf)
494 trace_seq_printf(s, "%x", entry->preempt_count & 0xf);
495 else
496 trace_seq_putc(s, '.');
497
498 if (entry->preempt_count & 0xf0)
499 trace_seq_printf(s, "%x", entry->preempt_count >> 4);
500 else
501 trace_seq_putc(s, '.');
502
503 return !trace_seq_has_overflowed(s);
504}
505
506static int
507lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
508{
509 char comm[TASK_COMM_LEN];
510
511 trace_find_cmdline(entry->pid, comm);
512
513 trace_seq_printf(s, "%8.8s-%-7d %3d",
514 comm, entry->pid, cpu);
515
516 return trace_print_lat_fmt(s, entry);
517}
518
519#undef MARK
520#define MARK(v, s) {.val = v, .sym = s}
521/* trace overhead mark */
522static const struct trace_mark {
523 unsigned long long val; /* unit: nsec */
524 char sym;
525} mark[] = {
526 MARK(1000000000ULL , '$'), /* 1 sec */
527 MARK(100000000ULL , '@'), /* 100 msec */
528 MARK(10000000ULL , '*'), /* 10 msec */
529 MARK(1000000ULL , '#'), /* 1000 usecs */
530 MARK(100000ULL , '!'), /* 100 usecs */
531 MARK(10000ULL , '+'), /* 10 usecs */
532};
533#undef MARK
534
535char trace_find_mark(unsigned long long d)
536{
537 int i;
538 int size = ARRAY_SIZE(mark);
539
540 for (i = 0; i < size; i++) {
541 if (d > mark[i].val)
542 break;
543 }
544
545 return (i == size) ? ' ' : mark[i].sym;
546}
547
548static int
549lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
550{
551 struct trace_array *tr = iter->tr;
552 unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
553 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
554 unsigned long long abs_ts = iter->ts - iter->array_buffer->time_start;
555 unsigned long long rel_ts = next_ts - iter->ts;
556 struct trace_seq *s = &iter->seq;
557
558 if (in_ns) {
559 abs_ts = ns2usecs(abs_ts);
560 rel_ts = ns2usecs(rel_ts);
561 }
562
563 if (verbose && in_ns) {
564 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
565 unsigned long abs_msec = (unsigned long)abs_ts;
566 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
567 unsigned long rel_msec = (unsigned long)rel_ts;
568
569 trace_seq_printf(
570 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
571 ns2usecs(iter->ts),
572 abs_msec, abs_usec,
573 rel_msec, rel_usec);
574
575 } else if (verbose && !in_ns) {
576 trace_seq_printf(
577 s, "[%016llx] %lld (+%lld): ",
578 iter->ts, abs_ts, rel_ts);
579
580 } else if (!verbose && in_ns) {
581 trace_seq_printf(
582 s, " %4lldus%c: ",
583 abs_ts,
584 trace_find_mark(rel_ts * NSEC_PER_USEC));
585
586 } else { /* !verbose && !in_ns */
587 trace_seq_printf(s, " %4lld: ", abs_ts);
588 }
589
590 return !trace_seq_has_overflowed(s);
591}
592
593static void trace_print_time(struct trace_seq *s, struct trace_iterator *iter,
594 unsigned long long ts)
595{
596 unsigned long secs, usec_rem;
597 unsigned long long t;
598
599 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
600 t = ns2usecs(ts);
601 usec_rem = do_div(t, USEC_PER_SEC);
602 secs = (unsigned long)t;
603 trace_seq_printf(s, " %5lu.%06lu", secs, usec_rem);
604 } else
605 trace_seq_printf(s, " %12llu", ts);
606}
607
608int trace_print_context(struct trace_iterator *iter)
609{
610 struct trace_array *tr = iter->tr;
611 struct trace_seq *s = &iter->seq;
612 struct trace_entry *entry = iter->ent;
613 char comm[TASK_COMM_LEN];
614
615 trace_find_cmdline(entry->pid, comm);
616
617 trace_seq_printf(s, "%16s-%-7d ", comm, entry->pid);
618
619 if (tr->trace_flags & TRACE_ITER_RECORD_TGID) {
620 unsigned int tgid = trace_find_tgid(entry->pid);
621
622 if (!tgid)
623 trace_seq_printf(s, "(-------) ");
624 else
625 trace_seq_printf(s, "(%7d) ", tgid);
626 }
627
628 trace_seq_printf(s, "[%03d] ", iter->cpu);
629
630 if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
631 trace_print_lat_fmt(s, entry);
632
633 trace_print_time(s, iter, iter->ts);
634 trace_seq_puts(s, ": ");
635
636 return !trace_seq_has_overflowed(s);
637}
638
639int trace_print_lat_context(struct trace_iterator *iter)
640{
641 struct trace_entry *entry, *next_entry;
642 struct trace_array *tr = iter->tr;
643 struct trace_seq *s = &iter->seq;
644 unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
645 u64 next_ts;
646
647 next_entry = trace_find_next_entry(iter, NULL, &next_ts);
648 if (!next_entry)
649 next_ts = iter->ts;
650
651 /* trace_find_next_entry() may change iter->ent */
652 entry = iter->ent;
653
654 if (verbose) {
655 char comm[TASK_COMM_LEN];
656
657 trace_find_cmdline(entry->pid, comm);
658
659 trace_seq_printf(
660 s, "%16s %7d %3d %d %08x %08lx ",
661 comm, entry->pid, iter->cpu, entry->flags,
662 entry->preempt_count & 0xf, iter->idx);
663 } else {
664 lat_print_generic(s, entry, iter->cpu);
665 }
666
667 lat_print_timestamp(iter, next_ts);
668
669 return !trace_seq_has_overflowed(s);
670}
671
672/**
673 * ftrace_find_event - find a registered event
674 * @type: the type of event to look for
675 *
676 * Returns an event of type @type otherwise NULL
677 * Called with trace_event_read_lock() held.
678 */
679struct trace_event *ftrace_find_event(int type)
680{
681 struct trace_event *event;
682 unsigned key;
683
684 key = type & (EVENT_HASHSIZE - 1);
685
686 hlist_for_each_entry(event, &event_hash[key], node) {
687 if (event->type == type)
688 return event;
689 }
690
691 return NULL;
692}
693
694static DEFINE_IDA(trace_event_ida);
695
696static void free_trace_event_type(int type)
697{
698 if (type >= __TRACE_LAST_TYPE)
699 ida_free(&trace_event_ida, type);
700}
701
702static int alloc_trace_event_type(void)
703{
704 int next;
705
706 /* Skip static defined type numbers */
707 next = ida_alloc_range(&trace_event_ida, __TRACE_LAST_TYPE,
708 TRACE_EVENT_TYPE_MAX, GFP_KERNEL);
709 if (next < 0)
710 return 0;
711 return next;
712}
713
714void trace_event_read_lock(void)
715{
716 down_read(&trace_event_sem);
717}
718
719void trace_event_read_unlock(void)
720{
721 up_read(&trace_event_sem);
722}
723
724/**
725 * register_trace_event - register output for an event type
726 * @event: the event type to register
727 *
728 * Event types are stored in a hash and this hash is used to
729 * find a way to print an event. If the @event->type is set
730 * then it will use that type, otherwise it will assign a
731 * type to use.
732 *
733 * If you assign your own type, please make sure it is added
734 * to the trace_type enum in trace.h, to avoid collisions
735 * with the dynamic types.
736 *
737 * Returns the event type number or zero on error.
738 */
739int register_trace_event(struct trace_event *event)
740{
741 unsigned key;
742 int ret = 0;
743
744 down_write(&trace_event_sem);
745
746 if (WARN_ON(!event))
747 goto out;
748
749 if (WARN_ON(!event->funcs))
750 goto out;
751
752 if (!event->type) {
753 event->type = alloc_trace_event_type();
754 if (!event->type)
755 goto out;
756 } else if (WARN(event->type > __TRACE_LAST_TYPE,
757 "Need to add type to trace.h")) {
758 goto out;
759 } else {
760 /* Is this event already used */
761 if (ftrace_find_event(event->type))
762 goto out;
763 }
764
765 if (event->funcs->trace == NULL)
766 event->funcs->trace = trace_nop_print;
767 if (event->funcs->raw == NULL)
768 event->funcs->raw = trace_nop_print;
769 if (event->funcs->hex == NULL)
770 event->funcs->hex = trace_nop_print;
771 if (event->funcs->binary == NULL)
772 event->funcs->binary = trace_nop_print;
773
774 key = event->type & (EVENT_HASHSIZE - 1);
775
776 hlist_add_head(&event->node, &event_hash[key]);
777
778 ret = event->type;
779 out:
780 up_write(&trace_event_sem);
781
782 return ret;
783}
784EXPORT_SYMBOL_GPL(register_trace_event);
785
786/*
787 * Used by module code with the trace_event_sem held for write.
788 */
789int __unregister_trace_event(struct trace_event *event)
790{
791 hlist_del(&event->node);
792 free_trace_event_type(event->type);
793 return 0;
794}
795
796/**
797 * unregister_trace_event - remove a no longer used event
798 * @event: the event to remove
799 */
800int unregister_trace_event(struct trace_event *event)
801{
802 down_write(&trace_event_sem);
803 __unregister_trace_event(event);
804 up_write(&trace_event_sem);
805
806 return 0;
807}
808EXPORT_SYMBOL_GPL(unregister_trace_event);
809
810/*
811 * Standard events
812 */
813
814static void print_array(struct trace_iterator *iter, void *pos,
815 struct ftrace_event_field *field)
816{
817 int offset;
818 int len;
819 int i;
820
821 offset = *(int *)pos & 0xffff;
822 len = *(int *)pos >> 16;
823
824 if (field)
825 offset += field->offset + sizeof(int);
826
827 if (offset + len > iter->ent_size) {
828 trace_seq_puts(&iter->seq, "<OVERFLOW>");
829 return;
830 }
831
832 pos = (void *)iter->ent + offset;
833
834 for (i = 0; i < len; i++, pos++) {
835 if (i)
836 trace_seq_putc(&iter->seq, ',');
837 trace_seq_printf(&iter->seq, "%02x", *(unsigned char *)pos);
838 }
839}
840
841static void print_fields(struct trace_iterator *iter, struct trace_event_call *call,
842 struct list_head *head)
843{
844 struct ftrace_event_field *field;
845 int offset;
846 int len;
847 int ret;
848 void *pos;
849
850 list_for_each_entry_reverse(field, head, link) {
851 trace_seq_printf(&iter->seq, " %s=", field->name);
852 if (field->offset + field->size > iter->ent_size) {
853 trace_seq_puts(&iter->seq, "<OVERFLOW>");
854 continue;
855 }
856 pos = (void *)iter->ent + field->offset;
857
858 switch (field->filter_type) {
859 case FILTER_COMM:
860 case FILTER_STATIC_STRING:
861 trace_seq_printf(&iter->seq, "%.*s", field->size, (char *)pos);
862 break;
863 case FILTER_RDYN_STRING:
864 case FILTER_DYN_STRING:
865 offset = *(int *)pos & 0xffff;
866 len = *(int *)pos >> 16;
867
868 if (field->filter_type == FILTER_RDYN_STRING)
869 offset += field->offset + sizeof(int);
870
871 if (offset + len > iter->ent_size) {
872 trace_seq_puts(&iter->seq, "<OVERFLOW>");
873 break;
874 }
875 pos = (void *)iter->ent + offset;
876 trace_seq_printf(&iter->seq, "%.*s", len, (char *)pos);
877 break;
878 case FILTER_PTR_STRING:
879 if (!iter->fmt_size)
880 trace_iter_expand_format(iter);
881 pos = *(void **)pos;
882 ret = strncpy_from_kernel_nofault(iter->fmt, pos,
883 iter->fmt_size);
884 if (ret < 0)
885 trace_seq_printf(&iter->seq, "(0x%px)", pos);
886 else
887 trace_seq_printf(&iter->seq, "(0x%px:%s)",
888 pos, iter->fmt);
889 break;
890 case FILTER_TRACE_FN:
891 pos = *(void **)pos;
892 trace_seq_printf(&iter->seq, "%pS", pos);
893 break;
894 case FILTER_CPU:
895 case FILTER_OTHER:
896 switch (field->size) {
897 case 1:
898 if (isprint(*(char *)pos)) {
899 trace_seq_printf(&iter->seq, "'%c'",
900 *(unsigned char *)pos);
901 }
902 trace_seq_printf(&iter->seq, "(%d)",
903 *(unsigned char *)pos);
904 break;
905 case 2:
906 trace_seq_printf(&iter->seq, "0x%x (%d)",
907 *(unsigned short *)pos,
908 *(unsigned short *)pos);
909 break;
910 case 4:
911 /* dynamic array info is 4 bytes */
912 if (strstr(field->type, "__data_loc")) {
913 print_array(iter, pos, NULL);
914 break;
915 }
916
917 if (strstr(field->type, "__rel_loc")) {
918 print_array(iter, pos, field);
919 break;
920 }
921
922 trace_seq_printf(&iter->seq, "0x%x (%d)",
923 *(unsigned int *)pos,
924 *(unsigned int *)pos);
925 break;
926 case 8:
927 trace_seq_printf(&iter->seq, "0x%llx (%lld)",
928 *(unsigned long long *)pos,
929 *(unsigned long long *)pos);
930 break;
931 default:
932 trace_seq_puts(&iter->seq, "<INVALID-SIZE>");
933 break;
934 }
935 break;
936 default:
937 trace_seq_puts(&iter->seq, "<INVALID-TYPE>");
938 }
939 }
940 trace_seq_putc(&iter->seq, '\n');
941}
942
943enum print_line_t print_event_fields(struct trace_iterator *iter,
944 struct trace_event *event)
945{
946 struct trace_event_call *call;
947 struct list_head *head;
948
949 /* ftrace defined events have separate call structures */
950 if (event->type <= __TRACE_LAST_TYPE) {
951 bool found = false;
952
953 down_read(&trace_event_sem);
954 list_for_each_entry(call, &ftrace_events, list) {
955 if (call->event.type == event->type) {
956 found = true;
957 break;
958 }
959 /* No need to search all events */
960 if (call->event.type > __TRACE_LAST_TYPE)
961 break;
962 }
963 up_read(&trace_event_sem);
964 if (!found) {
965 trace_seq_printf(&iter->seq, "UNKNOWN TYPE %d\n", event->type);
966 goto out;
967 }
968 } else {
969 call = container_of(event, struct trace_event_call, event);
970 }
971 head = trace_get_fields(call);
972
973 trace_seq_printf(&iter->seq, "%s:", trace_event_name(call));
974
975 if (head && !list_empty(head))
976 print_fields(iter, call, head);
977 else
978 trace_seq_puts(&iter->seq, "No fields found\n");
979
980 out:
981 return trace_handle_return(&iter->seq);
982}
983
984enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
985 struct trace_event *event)
986{
987 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
988
989 return trace_handle_return(&iter->seq);
990}
991
992static void print_fn_trace(struct trace_seq *s, unsigned long ip,
993 unsigned long parent_ip, int flags)
994{
995 seq_print_ip_sym(s, ip, flags);
996
997 if ((flags & TRACE_ITER_PRINT_PARENT) && parent_ip) {
998 trace_seq_puts(s, " <-");
999 seq_print_ip_sym(s, parent_ip, flags);
1000 }
1001}
1002
1003/* TRACE_FN */
1004static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
1005 struct trace_event *event)
1006{
1007 struct ftrace_entry *field;
1008 struct trace_seq *s = &iter->seq;
1009
1010 trace_assign_type(field, iter->ent);
1011
1012 print_fn_trace(s, field->ip, field->parent_ip, flags);
1013 trace_seq_putc(s, '\n');
1014
1015 return trace_handle_return(s);
1016}
1017
1018static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
1019 struct trace_event *event)
1020{
1021 struct ftrace_entry *field;
1022
1023 trace_assign_type(field, iter->ent);
1024
1025 trace_seq_printf(&iter->seq, "%lx %lx\n",
1026 field->ip,
1027 field->parent_ip);
1028
1029 return trace_handle_return(&iter->seq);
1030}
1031
1032static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
1033 struct trace_event *event)
1034{
1035 struct ftrace_entry *field;
1036 struct trace_seq *s = &iter->seq;
1037
1038 trace_assign_type(field, iter->ent);
1039
1040 SEQ_PUT_HEX_FIELD(s, field->ip);
1041 SEQ_PUT_HEX_FIELD(s, field->parent_ip);
1042
1043 return trace_handle_return(s);
1044}
1045
1046static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
1047 struct trace_event *event)
1048{
1049 struct ftrace_entry *field;
1050 struct trace_seq *s = &iter->seq;
1051
1052 trace_assign_type(field, iter->ent);
1053
1054 SEQ_PUT_FIELD(s, field->ip);
1055 SEQ_PUT_FIELD(s, field->parent_ip);
1056
1057 return trace_handle_return(s);
1058}
1059
1060static struct trace_event_functions trace_fn_funcs = {
1061 .trace = trace_fn_trace,
1062 .raw = trace_fn_raw,
1063 .hex = trace_fn_hex,
1064 .binary = trace_fn_bin,
1065};
1066
1067static struct trace_event trace_fn_event = {
1068 .type = TRACE_FN,
1069 .funcs = &trace_fn_funcs,
1070};
1071
1072/* TRACE_CTX an TRACE_WAKE */
1073static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
1074 char *delim)
1075{
1076 struct ctx_switch_entry *field;
1077 char comm[TASK_COMM_LEN];
1078 int S, T;
1079
1080
1081 trace_assign_type(field, iter->ent);
1082
1083 T = task_index_to_char(field->next_state);
1084 S = task_index_to_char(field->prev_state);
1085 trace_find_cmdline(field->next_pid, comm);
1086 trace_seq_printf(&iter->seq,
1087 " %7d:%3d:%c %s [%03d] %7d:%3d:%c %s\n",
1088 field->prev_pid,
1089 field->prev_prio,
1090 S, delim,
1091 field->next_cpu,
1092 field->next_pid,
1093 field->next_prio,
1094 T, comm);
1095
1096 return trace_handle_return(&iter->seq);
1097}
1098
1099static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
1100 struct trace_event *event)
1101{
1102 return trace_ctxwake_print(iter, "==>");
1103}
1104
1105static enum print_line_t trace_wake_print(struct trace_iterator *iter,
1106 int flags, struct trace_event *event)
1107{
1108 return trace_ctxwake_print(iter, " +");
1109}
1110
1111static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
1112{
1113 struct ctx_switch_entry *field;
1114 int T;
1115
1116 trace_assign_type(field, iter->ent);
1117
1118 if (!S)
1119 S = task_index_to_char(field->prev_state);
1120 T = task_index_to_char(field->next_state);
1121 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
1122 field->prev_pid,
1123 field->prev_prio,
1124 S,
1125 field->next_cpu,
1126 field->next_pid,
1127 field->next_prio,
1128 T);
1129
1130 return trace_handle_return(&iter->seq);
1131}
1132
1133static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
1134 struct trace_event *event)
1135{
1136 return trace_ctxwake_raw(iter, 0);
1137}
1138
1139static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
1140 struct trace_event *event)
1141{
1142 return trace_ctxwake_raw(iter, '+');
1143}
1144
1145
1146static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
1147{
1148 struct ctx_switch_entry *field;
1149 struct trace_seq *s = &iter->seq;
1150 int T;
1151
1152 trace_assign_type(field, iter->ent);
1153
1154 if (!S)
1155 S = task_index_to_char(field->prev_state);
1156 T = task_index_to_char(field->next_state);
1157
1158 SEQ_PUT_HEX_FIELD(s, field->prev_pid);
1159 SEQ_PUT_HEX_FIELD(s, field->prev_prio);
1160 SEQ_PUT_HEX_FIELD(s, S);
1161 SEQ_PUT_HEX_FIELD(s, field->next_cpu);
1162 SEQ_PUT_HEX_FIELD(s, field->next_pid);
1163 SEQ_PUT_HEX_FIELD(s, field->next_prio);
1164 SEQ_PUT_HEX_FIELD(s, T);
1165
1166 return trace_handle_return(s);
1167}
1168
1169static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1170 struct trace_event *event)
1171{
1172 return trace_ctxwake_hex(iter, 0);
1173}
1174
1175static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1176 struct trace_event *event)
1177{
1178 return trace_ctxwake_hex(iter, '+');
1179}
1180
1181static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1182 int flags, struct trace_event *event)
1183{
1184 struct ctx_switch_entry *field;
1185 struct trace_seq *s = &iter->seq;
1186
1187 trace_assign_type(field, iter->ent);
1188
1189 SEQ_PUT_FIELD(s, field->prev_pid);
1190 SEQ_PUT_FIELD(s, field->prev_prio);
1191 SEQ_PUT_FIELD(s, field->prev_state);
1192 SEQ_PUT_FIELD(s, field->next_cpu);
1193 SEQ_PUT_FIELD(s, field->next_pid);
1194 SEQ_PUT_FIELD(s, field->next_prio);
1195 SEQ_PUT_FIELD(s, field->next_state);
1196
1197 return trace_handle_return(s);
1198}
1199
1200static struct trace_event_functions trace_ctx_funcs = {
1201 .trace = trace_ctx_print,
1202 .raw = trace_ctx_raw,
1203 .hex = trace_ctx_hex,
1204 .binary = trace_ctxwake_bin,
1205};
1206
1207static struct trace_event trace_ctx_event = {
1208 .type = TRACE_CTX,
1209 .funcs = &trace_ctx_funcs,
1210};
1211
1212static struct trace_event_functions trace_wake_funcs = {
1213 .trace = trace_wake_print,
1214 .raw = trace_wake_raw,
1215 .hex = trace_wake_hex,
1216 .binary = trace_ctxwake_bin,
1217};
1218
1219static struct trace_event trace_wake_event = {
1220 .type = TRACE_WAKE,
1221 .funcs = &trace_wake_funcs,
1222};
1223
1224/* TRACE_STACK */
1225
1226static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1227 int flags, struct trace_event *event)
1228{
1229 struct stack_entry *field;
1230 struct trace_seq *s = &iter->seq;
1231 unsigned long *p;
1232 unsigned long *end;
1233
1234 trace_assign_type(field, iter->ent);
1235 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1236
1237 trace_seq_puts(s, "<stack trace>\n");
1238
1239 for (p = field->caller; p && p < end && *p != ULONG_MAX; p++) {
1240
1241 if (trace_seq_has_overflowed(s))
1242 break;
1243
1244 trace_seq_puts(s, " => ");
1245 seq_print_ip_sym(s, *p, flags);
1246 trace_seq_putc(s, '\n');
1247 }
1248
1249 return trace_handle_return(s);
1250}
1251
1252static struct trace_event_functions trace_stack_funcs = {
1253 .trace = trace_stack_print,
1254};
1255
1256static struct trace_event trace_stack_event = {
1257 .type = TRACE_STACK,
1258 .funcs = &trace_stack_funcs,
1259};
1260
1261/* TRACE_USER_STACK */
1262static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1263 int flags, struct trace_event *event)
1264{
1265 struct trace_array *tr = iter->tr;
1266 struct userstack_entry *field;
1267 struct trace_seq *s = &iter->seq;
1268 struct mm_struct *mm = NULL;
1269 unsigned int i;
1270
1271 trace_assign_type(field, iter->ent);
1272
1273 trace_seq_puts(s, "<user stack trace>\n");
1274
1275 if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
1276 struct task_struct *task;
1277 /*
1278 * we do the lookup on the thread group leader,
1279 * since individual threads might have already quit!
1280 */
1281 rcu_read_lock();
1282 task = find_task_by_vpid(field->tgid);
1283 if (task)
1284 mm = get_task_mm(task);
1285 rcu_read_unlock();
1286 }
1287
1288 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1289 unsigned long ip = field->caller[i];
1290
1291 if (!ip || trace_seq_has_overflowed(s))
1292 break;
1293
1294 trace_seq_puts(s, " => ");
1295 seq_print_user_ip(s, mm, ip, flags);
1296 trace_seq_putc(s, '\n');
1297 }
1298
1299 if (mm)
1300 mmput(mm);
1301
1302 return trace_handle_return(s);
1303}
1304
1305static struct trace_event_functions trace_user_stack_funcs = {
1306 .trace = trace_user_stack_print,
1307};
1308
1309static struct trace_event trace_user_stack_event = {
1310 .type = TRACE_USER_STACK,
1311 .funcs = &trace_user_stack_funcs,
1312};
1313
1314/* TRACE_HWLAT */
1315static enum print_line_t
1316trace_hwlat_print(struct trace_iterator *iter, int flags,
1317 struct trace_event *event)
1318{
1319 struct trace_entry *entry = iter->ent;
1320 struct trace_seq *s = &iter->seq;
1321 struct hwlat_entry *field;
1322
1323 trace_assign_type(field, entry);
1324
1325 trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld count:%d",
1326 field->seqnum,
1327 field->duration,
1328 field->outer_duration,
1329 (long long)field->timestamp.tv_sec,
1330 field->timestamp.tv_nsec, field->count);
1331
1332 if (field->nmi_count) {
1333 /*
1334 * The generic sched_clock() is not NMI safe, thus
1335 * we only record the count and not the time.
1336 */
1337 if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK))
1338 trace_seq_printf(s, " nmi-total:%llu",
1339 field->nmi_total_ts);
1340 trace_seq_printf(s, " nmi-count:%u",
1341 field->nmi_count);
1342 }
1343
1344 trace_seq_putc(s, '\n');
1345
1346 return trace_handle_return(s);
1347}
1348
1349static enum print_line_t
1350trace_hwlat_raw(struct trace_iterator *iter, int flags,
1351 struct trace_event *event)
1352{
1353 struct hwlat_entry *field;
1354 struct trace_seq *s = &iter->seq;
1355
1356 trace_assign_type(field, iter->ent);
1357
1358 trace_seq_printf(s, "%llu %lld %lld %09ld %u\n",
1359 field->duration,
1360 field->outer_duration,
1361 (long long)field->timestamp.tv_sec,
1362 field->timestamp.tv_nsec,
1363 field->seqnum);
1364
1365 return trace_handle_return(s);
1366}
1367
1368static struct trace_event_functions trace_hwlat_funcs = {
1369 .trace = trace_hwlat_print,
1370 .raw = trace_hwlat_raw,
1371};
1372
1373static struct trace_event trace_hwlat_event = {
1374 .type = TRACE_HWLAT,
1375 .funcs = &trace_hwlat_funcs,
1376};
1377
1378/* TRACE_OSNOISE */
1379static enum print_line_t
1380trace_osnoise_print(struct trace_iterator *iter, int flags,
1381 struct trace_event *event)
1382{
1383 struct trace_entry *entry = iter->ent;
1384 struct trace_seq *s = &iter->seq;
1385 struct osnoise_entry *field;
1386 u64 ratio, ratio_dec;
1387 u64 net_runtime;
1388
1389 trace_assign_type(field, entry);
1390
1391 /*
1392 * compute the available % of cpu time.
1393 */
1394 net_runtime = field->runtime - field->noise;
1395 ratio = net_runtime * 10000000;
1396 do_div(ratio, field->runtime);
1397 ratio_dec = do_div(ratio, 100000);
1398
1399 trace_seq_printf(s, "%llu %10llu %3llu.%05llu %7llu",
1400 field->runtime,
1401 field->noise,
1402 ratio, ratio_dec,
1403 field->max_sample);
1404
1405 trace_seq_printf(s, " %6u", field->hw_count);
1406 trace_seq_printf(s, " %6u", field->nmi_count);
1407 trace_seq_printf(s, " %6u", field->irq_count);
1408 trace_seq_printf(s, " %6u", field->softirq_count);
1409 trace_seq_printf(s, " %6u", field->thread_count);
1410
1411 trace_seq_putc(s, '\n');
1412
1413 return trace_handle_return(s);
1414}
1415
1416static enum print_line_t
1417trace_osnoise_raw(struct trace_iterator *iter, int flags,
1418 struct trace_event *event)
1419{
1420 struct osnoise_entry *field;
1421 struct trace_seq *s = &iter->seq;
1422
1423 trace_assign_type(field, iter->ent);
1424
1425 trace_seq_printf(s, "%lld %llu %llu %u %u %u %u %u\n",
1426 field->runtime,
1427 field->noise,
1428 field->max_sample,
1429 field->hw_count,
1430 field->nmi_count,
1431 field->irq_count,
1432 field->softirq_count,
1433 field->thread_count);
1434
1435 return trace_handle_return(s);
1436}
1437
1438static struct trace_event_functions trace_osnoise_funcs = {
1439 .trace = trace_osnoise_print,
1440 .raw = trace_osnoise_raw,
1441};
1442
1443static struct trace_event trace_osnoise_event = {
1444 .type = TRACE_OSNOISE,
1445 .funcs = &trace_osnoise_funcs,
1446};
1447
1448/* TRACE_TIMERLAT */
1449
1450static char *timerlat_lat_context[] = {"irq", "thread", "user-ret"};
1451static enum print_line_t
1452trace_timerlat_print(struct trace_iterator *iter, int flags,
1453 struct trace_event *event)
1454{
1455 struct trace_entry *entry = iter->ent;
1456 struct trace_seq *s = &iter->seq;
1457 struct timerlat_entry *field;
1458
1459 trace_assign_type(field, entry);
1460
1461 trace_seq_printf(s, "#%-5u context %6s timer_latency %9llu ns\n",
1462 field->seqnum,
1463 timerlat_lat_context[field->context],
1464 field->timer_latency);
1465
1466 return trace_handle_return(s);
1467}
1468
1469static enum print_line_t
1470trace_timerlat_raw(struct trace_iterator *iter, int flags,
1471 struct trace_event *event)
1472{
1473 struct timerlat_entry *field;
1474 struct trace_seq *s = &iter->seq;
1475
1476 trace_assign_type(field, iter->ent);
1477
1478 trace_seq_printf(s, "%u %d %llu\n",
1479 field->seqnum,
1480 field->context,
1481 field->timer_latency);
1482
1483 return trace_handle_return(s);
1484}
1485
1486static struct trace_event_functions trace_timerlat_funcs = {
1487 .trace = trace_timerlat_print,
1488 .raw = trace_timerlat_raw,
1489};
1490
1491static struct trace_event trace_timerlat_event = {
1492 .type = TRACE_TIMERLAT,
1493 .funcs = &trace_timerlat_funcs,
1494};
1495
1496/* TRACE_BPUTS */
1497static enum print_line_t
1498trace_bputs_print(struct trace_iterator *iter, int flags,
1499 struct trace_event *event)
1500{
1501 struct trace_entry *entry = iter->ent;
1502 struct trace_seq *s = &iter->seq;
1503 struct bputs_entry *field;
1504
1505 trace_assign_type(field, entry);
1506
1507 seq_print_ip_sym(s, field->ip, flags);
1508 trace_seq_puts(s, ": ");
1509 trace_seq_puts(s, field->str);
1510
1511 return trace_handle_return(s);
1512}
1513
1514
1515static enum print_line_t
1516trace_bputs_raw(struct trace_iterator *iter, int flags,
1517 struct trace_event *event)
1518{
1519 struct bputs_entry *field;
1520 struct trace_seq *s = &iter->seq;
1521
1522 trace_assign_type(field, iter->ent);
1523
1524 trace_seq_printf(s, ": %lx : ", field->ip);
1525 trace_seq_puts(s, field->str);
1526
1527 return trace_handle_return(s);
1528}
1529
1530static struct trace_event_functions trace_bputs_funcs = {
1531 .trace = trace_bputs_print,
1532 .raw = trace_bputs_raw,
1533};
1534
1535static struct trace_event trace_bputs_event = {
1536 .type = TRACE_BPUTS,
1537 .funcs = &trace_bputs_funcs,
1538};
1539
1540/* TRACE_BPRINT */
1541static enum print_line_t
1542trace_bprint_print(struct trace_iterator *iter, int flags,
1543 struct trace_event *event)
1544{
1545 struct trace_entry *entry = iter->ent;
1546 struct trace_seq *s = &iter->seq;
1547 struct bprint_entry *field;
1548
1549 trace_assign_type(field, entry);
1550
1551 seq_print_ip_sym(s, field->ip, flags);
1552 trace_seq_puts(s, ": ");
1553 trace_seq_bprintf(s, field->fmt, field->buf);
1554
1555 return trace_handle_return(s);
1556}
1557
1558
1559static enum print_line_t
1560trace_bprint_raw(struct trace_iterator *iter, int flags,
1561 struct trace_event *event)
1562{
1563 struct bprint_entry *field;
1564 struct trace_seq *s = &iter->seq;
1565
1566 trace_assign_type(field, iter->ent);
1567
1568 trace_seq_printf(s, ": %lx : ", field->ip);
1569 trace_seq_bprintf(s, field->fmt, field->buf);
1570
1571 return trace_handle_return(s);
1572}
1573
1574static struct trace_event_functions trace_bprint_funcs = {
1575 .trace = trace_bprint_print,
1576 .raw = trace_bprint_raw,
1577};
1578
1579static struct trace_event trace_bprint_event = {
1580 .type = TRACE_BPRINT,
1581 .funcs = &trace_bprint_funcs,
1582};
1583
1584/* TRACE_PRINT */
1585static enum print_line_t trace_print_print(struct trace_iterator *iter,
1586 int flags, struct trace_event *event)
1587{
1588 struct print_entry *field;
1589 struct trace_seq *s = &iter->seq;
1590
1591 trace_assign_type(field, iter->ent);
1592
1593 seq_print_ip_sym(s, field->ip, flags);
1594 trace_seq_printf(s, ": %s", field->buf);
1595
1596 return trace_handle_return(s);
1597}
1598
1599static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1600 struct trace_event *event)
1601{
1602 struct print_entry *field;
1603
1604 trace_assign_type(field, iter->ent);
1605
1606 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1607
1608 return trace_handle_return(&iter->seq);
1609}
1610
1611static struct trace_event_functions trace_print_funcs = {
1612 .trace = trace_print_print,
1613 .raw = trace_print_raw,
1614};
1615
1616static struct trace_event trace_print_event = {
1617 .type = TRACE_PRINT,
1618 .funcs = &trace_print_funcs,
1619};
1620
1621static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags,
1622 struct trace_event *event)
1623{
1624 struct raw_data_entry *field;
1625 int i;
1626
1627 trace_assign_type(field, iter->ent);
1628
1629 trace_seq_printf(&iter->seq, "# %x buf:", field->id);
1630
1631 for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++)
1632 trace_seq_printf(&iter->seq, " %02x",
1633 (unsigned char)field->buf[i]);
1634
1635 trace_seq_putc(&iter->seq, '\n');
1636
1637 return trace_handle_return(&iter->seq);
1638}
1639
1640static struct trace_event_functions trace_raw_data_funcs = {
1641 .trace = trace_raw_data,
1642 .raw = trace_raw_data,
1643};
1644
1645static struct trace_event trace_raw_data_event = {
1646 .type = TRACE_RAW_DATA,
1647 .funcs = &trace_raw_data_funcs,
1648};
1649
1650static enum print_line_t
1651trace_func_repeats_raw(struct trace_iterator *iter, int flags,
1652 struct trace_event *event)
1653{
1654 struct func_repeats_entry *field;
1655 struct trace_seq *s = &iter->seq;
1656
1657 trace_assign_type(field, iter->ent);
1658
1659 trace_seq_printf(s, "%lu %lu %u %llu\n",
1660 field->ip,
1661 field->parent_ip,
1662 field->count,
1663 FUNC_REPEATS_GET_DELTA_TS(field));
1664
1665 return trace_handle_return(s);
1666}
1667
1668static enum print_line_t
1669trace_func_repeats_print(struct trace_iterator *iter, int flags,
1670 struct trace_event *event)
1671{
1672 struct func_repeats_entry *field;
1673 struct trace_seq *s = &iter->seq;
1674
1675 trace_assign_type(field, iter->ent);
1676
1677 print_fn_trace(s, field->ip, field->parent_ip, flags);
1678 trace_seq_printf(s, " (repeats: %u, last_ts:", field->count);
1679 trace_print_time(s, iter,
1680 iter->ts - FUNC_REPEATS_GET_DELTA_TS(field));
1681 trace_seq_puts(s, ")\n");
1682
1683 return trace_handle_return(s);
1684}
1685
1686static struct trace_event_functions trace_func_repeats_funcs = {
1687 .trace = trace_func_repeats_print,
1688 .raw = trace_func_repeats_raw,
1689};
1690
1691static struct trace_event trace_func_repeats_event = {
1692 .type = TRACE_FUNC_REPEATS,
1693 .funcs = &trace_func_repeats_funcs,
1694};
1695
1696static struct trace_event *events[] __initdata = {
1697 &trace_fn_event,
1698 &trace_ctx_event,
1699 &trace_wake_event,
1700 &trace_stack_event,
1701 &trace_user_stack_event,
1702 &trace_bputs_event,
1703 &trace_bprint_event,
1704 &trace_print_event,
1705 &trace_hwlat_event,
1706 &trace_osnoise_event,
1707 &trace_timerlat_event,
1708 &trace_raw_data_event,
1709 &trace_func_repeats_event,
1710 NULL
1711};
1712
1713__init int init_events(void)
1714{
1715 struct trace_event *event;
1716 int i, ret;
1717
1718 for (i = 0; events[i]; i++) {
1719 event = events[i];
1720 ret = register_trace_event(event);
1721 WARN_ONCE(!ret, "event %d failed to register", event->type);
1722 }
1723
1724 return 0;
1725}