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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/*
2 * trace_output.c
3 *
4 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
5 *
6 */
7
8#include <linux/module.h>
9#include <linux/mutex.h>
10#include <linux/ftrace.h>
11
12#include "trace_output.h"
13
14/* must be a power of 2 */
15#define EVENT_HASHSIZE 128
16
17DECLARE_RWSEM(trace_event_sem);
18
19static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
20
21static int next_event_type = __TRACE_LAST_TYPE + 1;
22
23enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
24{
25 struct trace_seq *s = &iter->seq;
26 struct trace_entry *entry = iter->ent;
27 struct bputs_entry *field;
28
29 trace_assign_type(field, entry);
30
31 trace_seq_puts(s, field->str);
32
33 return trace_handle_return(s);
34}
35
36enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
37{
38 struct trace_seq *s = &iter->seq;
39 struct trace_entry *entry = iter->ent;
40 struct bprint_entry *field;
41
42 trace_assign_type(field, entry);
43
44 trace_seq_bprintf(s, field->fmt, field->buf);
45
46 return trace_handle_return(s);
47}
48
49enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
50{
51 struct trace_seq *s = &iter->seq;
52 struct trace_entry *entry = iter->ent;
53 struct print_entry *field;
54
55 trace_assign_type(field, entry);
56
57 trace_seq_puts(s, field->buf);
58
59 return trace_handle_return(s);
60}
61
62const char *
63trace_print_flags_seq(struct trace_seq *p, const char *delim,
64 unsigned long flags,
65 const struct trace_print_flags *flag_array)
66{
67 unsigned long mask;
68 const char *str;
69 const char *ret = trace_seq_buffer_ptr(p);
70 int i, first = 1;
71
72 for (i = 0; flag_array[i].name && flags; i++) {
73
74 mask = flag_array[i].mask;
75 if ((flags & mask) != mask)
76 continue;
77
78 str = flag_array[i].name;
79 flags &= ~mask;
80 if (!first && delim)
81 trace_seq_puts(p, delim);
82 else
83 first = 0;
84 trace_seq_puts(p, str);
85 }
86
87 /* check for left over flags */
88 if (flags) {
89 if (!first && delim)
90 trace_seq_puts(p, delim);
91 trace_seq_printf(p, "0x%lx", flags);
92 }
93
94 trace_seq_putc(p, 0);
95
96 return ret;
97}
98EXPORT_SYMBOL(trace_print_flags_seq);
99
100const char *
101trace_print_symbols_seq(struct trace_seq *p, unsigned long val,
102 const struct trace_print_flags *symbol_array)
103{
104 int i;
105 const char *ret = trace_seq_buffer_ptr(p);
106
107 for (i = 0; symbol_array[i].name; i++) {
108
109 if (val != symbol_array[i].mask)
110 continue;
111
112 trace_seq_puts(p, symbol_array[i].name);
113 break;
114 }
115
116 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
117 trace_seq_printf(p, "0x%lx", val);
118
119 trace_seq_putc(p, 0);
120
121 return ret;
122}
123EXPORT_SYMBOL(trace_print_symbols_seq);
124
125#if BITS_PER_LONG == 32
126const char *
127trace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
128 const struct trace_print_flags_u64 *symbol_array)
129{
130 int i;
131 const char *ret = trace_seq_buffer_ptr(p);
132
133 for (i = 0; symbol_array[i].name; i++) {
134
135 if (val != symbol_array[i].mask)
136 continue;
137
138 trace_seq_puts(p, symbol_array[i].name);
139 break;
140 }
141
142 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
143 trace_seq_printf(p, "0x%llx", val);
144
145 trace_seq_putc(p, 0);
146
147 return ret;
148}
149EXPORT_SYMBOL(trace_print_symbols_seq_u64);
150#endif
151
152const char *
153trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
154 unsigned int bitmask_size)
155{
156 const char *ret = trace_seq_buffer_ptr(p);
157
158 trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8);
159 trace_seq_putc(p, 0);
160
161 return ret;
162}
163EXPORT_SYMBOL_GPL(trace_print_bitmask_seq);
164
165const char *
166trace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
167{
168 int i;
169 const char *ret = trace_seq_buffer_ptr(p);
170
171 for (i = 0; i < buf_len; i++)
172 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
173
174 trace_seq_putc(p, 0);
175
176 return ret;
177}
178EXPORT_SYMBOL(trace_print_hex_seq);
179
180const char *
181trace_print_array_seq(struct trace_seq *p, const void *buf, int count,
182 size_t el_size)
183{
184 const char *ret = trace_seq_buffer_ptr(p);
185 const char *prefix = "";
186 void *ptr = (void *)buf;
187 size_t buf_len = count * el_size;
188
189 trace_seq_putc(p, '{');
190
191 while (ptr < buf + buf_len) {
192 switch (el_size) {
193 case 1:
194 trace_seq_printf(p, "%s0x%x", prefix,
195 *(u8 *)ptr);
196 break;
197 case 2:
198 trace_seq_printf(p, "%s0x%x", prefix,
199 *(u16 *)ptr);
200 break;
201 case 4:
202 trace_seq_printf(p, "%s0x%x", prefix,
203 *(u32 *)ptr);
204 break;
205 case 8:
206 trace_seq_printf(p, "%s0x%llx", prefix,
207 *(u64 *)ptr);
208 break;
209 default:
210 trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
211 *(u8 *)ptr);
212 el_size = 1;
213 }
214 prefix = ",";
215 ptr += el_size;
216 }
217
218 trace_seq_putc(p, '}');
219 trace_seq_putc(p, 0);
220
221 return ret;
222}
223EXPORT_SYMBOL(trace_print_array_seq);
224
225int trace_raw_output_prep(struct trace_iterator *iter,
226 struct trace_event *trace_event)
227{
228 struct trace_event_call *event;
229 struct trace_seq *s = &iter->seq;
230 struct trace_seq *p = &iter->tmp_seq;
231 struct trace_entry *entry;
232
233 event = container_of(trace_event, struct trace_event_call, event);
234 entry = iter->ent;
235
236 if (entry->type != event->event.type) {
237 WARN_ON_ONCE(1);
238 return TRACE_TYPE_UNHANDLED;
239 }
240
241 trace_seq_init(p);
242 trace_seq_printf(s, "%s: ", trace_event_name(event));
243
244 return trace_handle_return(s);
245}
246EXPORT_SYMBOL(trace_raw_output_prep);
247
248static int trace_output_raw(struct trace_iterator *iter, char *name,
249 char *fmt, va_list ap)
250{
251 struct trace_seq *s = &iter->seq;
252
253 trace_seq_printf(s, "%s: ", name);
254 trace_seq_vprintf(s, fmt, ap);
255
256 return trace_handle_return(s);
257}
258
259int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
260{
261 va_list ap;
262 int ret;
263
264 va_start(ap, fmt);
265 ret = trace_output_raw(iter, name, fmt, ap);
266 va_end(ap);
267
268 return ret;
269}
270EXPORT_SYMBOL_GPL(trace_output_call);
271
272#ifdef CONFIG_KRETPROBES
273static inline const char *kretprobed(const char *name)
274{
275 static const char tramp_name[] = "kretprobe_trampoline";
276 int size = sizeof(tramp_name);
277
278 if (strncmp(tramp_name, name, size) == 0)
279 return "[unknown/kretprobe'd]";
280 return name;
281}
282#else
283static inline const char *kretprobed(const char *name)
284{
285 return name;
286}
287#endif /* CONFIG_KRETPROBES */
288
289static void
290seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
291{
292#ifdef CONFIG_KALLSYMS
293 char str[KSYM_SYMBOL_LEN];
294 const char *name;
295
296 kallsyms_lookup(address, NULL, NULL, NULL, str);
297
298 name = kretprobed(str);
299
300 trace_seq_printf(s, fmt, name);
301#endif
302}
303
304static void
305seq_print_sym_offset(struct trace_seq *s, const char *fmt,
306 unsigned long address)
307{
308#ifdef CONFIG_KALLSYMS
309 char str[KSYM_SYMBOL_LEN];
310 const char *name;
311
312 sprint_symbol(str, address);
313 name = kretprobed(str);
314
315 trace_seq_printf(s, fmt, name);
316#endif
317}
318
319#ifndef CONFIG_64BIT
320# define IP_FMT "%08lx"
321#else
322# define IP_FMT "%016lx"
323#endif
324
325static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
326 unsigned long ip, unsigned long sym_flags)
327{
328 struct file *file = NULL;
329 unsigned long vmstart = 0;
330 int ret = 1;
331
332 if (s->full)
333 return 0;
334
335 if (mm) {
336 const struct vm_area_struct *vma;
337
338 down_read(&mm->mmap_sem);
339 vma = find_vma(mm, ip);
340 if (vma) {
341 file = vma->vm_file;
342 vmstart = vma->vm_start;
343 }
344 if (file) {
345 ret = trace_seq_path(s, &file->f_path);
346 if (ret)
347 trace_seq_printf(s, "[+0x%lx]",
348 ip - vmstart);
349 }
350 up_read(&mm->mmap_sem);
351 }
352 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
353 trace_seq_printf(s, " <" IP_FMT ">", ip);
354 return !trace_seq_has_overflowed(s);
355}
356
357int
358seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
359{
360 if (!ip) {
361 trace_seq_putc(s, '0');
362 goto out;
363 }
364
365 if (sym_flags & TRACE_ITER_SYM_OFFSET)
366 seq_print_sym_offset(s, "%s", ip);
367 else
368 seq_print_sym_short(s, "%s", ip);
369
370 if (sym_flags & TRACE_ITER_SYM_ADDR)
371 trace_seq_printf(s, " <" IP_FMT ">", ip);
372
373 out:
374 return !trace_seq_has_overflowed(s);
375}
376
377/**
378 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
379 * @s: trace seq struct to write to
380 * @entry: The trace entry field from the ring buffer
381 *
382 * Prints the generic fields of irqs off, in hard or softirq, preempt
383 * count.
384 */
385int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
386{
387 char hardsoft_irq;
388 char need_resched;
389 char irqs_off;
390 int hardirq;
391 int softirq;
392 int nmi;
393
394 nmi = entry->flags & TRACE_FLAG_NMI;
395 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
396 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
397
398 irqs_off =
399 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
400 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
401 '.';
402
403 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
404 TRACE_FLAG_PREEMPT_RESCHED)) {
405 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
406 need_resched = 'N';
407 break;
408 case TRACE_FLAG_NEED_RESCHED:
409 need_resched = 'n';
410 break;
411 case TRACE_FLAG_PREEMPT_RESCHED:
412 need_resched = 'p';
413 break;
414 default:
415 need_resched = '.';
416 break;
417 }
418
419 hardsoft_irq =
420 (nmi && hardirq) ? 'Z' :
421 nmi ? 'z' :
422 (hardirq && softirq) ? 'H' :
423 hardirq ? 'h' :
424 softirq ? 's' :
425 '.' ;
426
427 trace_seq_printf(s, "%c%c%c",
428 irqs_off, need_resched, hardsoft_irq);
429
430 if (entry->preempt_count)
431 trace_seq_printf(s, "%x", entry->preempt_count);
432 else
433 trace_seq_putc(s, '.');
434
435 return !trace_seq_has_overflowed(s);
436}
437
438static int
439lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
440{
441 char comm[TASK_COMM_LEN];
442
443 trace_find_cmdline(entry->pid, comm);
444
445 trace_seq_printf(s, "%8.8s-%-5d %3d",
446 comm, entry->pid, cpu);
447
448 return trace_print_lat_fmt(s, entry);
449}
450
451#undef MARK
452#define MARK(v, s) {.val = v, .sym = s}
453/* trace overhead mark */
454static const struct trace_mark {
455 unsigned long long val; /* unit: nsec */
456 char sym;
457} mark[] = {
458 MARK(1000000000ULL , '$'), /* 1 sec */
459 MARK(100000000ULL , '@'), /* 100 msec */
460 MARK(10000000ULL , '*'), /* 10 msec */
461 MARK(1000000ULL , '#'), /* 1000 usecs */
462 MARK(100000ULL , '!'), /* 100 usecs */
463 MARK(10000ULL , '+'), /* 10 usecs */
464};
465#undef MARK
466
467char trace_find_mark(unsigned long long d)
468{
469 int i;
470 int size = ARRAY_SIZE(mark);
471
472 for (i = 0; i < size; i++) {
473 if (d > mark[i].val)
474 break;
475 }
476
477 return (i == size) ? ' ' : mark[i].sym;
478}
479
480static int
481lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
482{
483 struct trace_array *tr = iter->tr;
484 unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
485 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
486 unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start;
487 unsigned long long rel_ts = next_ts - iter->ts;
488 struct trace_seq *s = &iter->seq;
489
490 if (in_ns) {
491 abs_ts = ns2usecs(abs_ts);
492 rel_ts = ns2usecs(rel_ts);
493 }
494
495 if (verbose && in_ns) {
496 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
497 unsigned long abs_msec = (unsigned long)abs_ts;
498 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
499 unsigned long rel_msec = (unsigned long)rel_ts;
500
501 trace_seq_printf(
502 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
503 ns2usecs(iter->ts),
504 abs_msec, abs_usec,
505 rel_msec, rel_usec);
506
507 } else if (verbose && !in_ns) {
508 trace_seq_printf(
509 s, "[%016llx] %lld (+%lld): ",
510 iter->ts, abs_ts, rel_ts);
511
512 } else if (!verbose && in_ns) {
513 trace_seq_printf(
514 s, " %4lldus%c: ",
515 abs_ts,
516 trace_find_mark(rel_ts * NSEC_PER_USEC));
517
518 } else { /* !verbose && !in_ns */
519 trace_seq_printf(s, " %4lld: ", abs_ts);
520 }
521
522 return !trace_seq_has_overflowed(s);
523}
524
525int trace_print_context(struct trace_iterator *iter)
526{
527 struct trace_array *tr = iter->tr;
528 struct trace_seq *s = &iter->seq;
529 struct trace_entry *entry = iter->ent;
530 unsigned long long t;
531 unsigned long secs, usec_rem;
532 char comm[TASK_COMM_LEN];
533
534 trace_find_cmdline(entry->pid, comm);
535
536 trace_seq_printf(s, "%16s-%-5d [%03d] ",
537 comm, entry->pid, iter->cpu);
538
539 if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
540 trace_print_lat_fmt(s, entry);
541
542 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
543 t = ns2usecs(iter->ts);
544 usec_rem = do_div(t, USEC_PER_SEC);
545 secs = (unsigned long)t;
546 trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
547 } else
548 trace_seq_printf(s, " %12llu: ", iter->ts);
549
550 return !trace_seq_has_overflowed(s);
551}
552
553int trace_print_lat_context(struct trace_iterator *iter)
554{
555 struct trace_array *tr = iter->tr;
556 /* trace_find_next_entry will reset ent_size */
557 int ent_size = iter->ent_size;
558 struct trace_seq *s = &iter->seq;
559 u64 next_ts;
560 struct trace_entry *entry = iter->ent,
561 *next_entry = trace_find_next_entry(iter, NULL,
562 &next_ts);
563 unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
564
565 /* Restore the original ent_size */
566 iter->ent_size = ent_size;
567
568 if (!next_entry)
569 next_ts = iter->ts;
570
571 if (verbose) {
572 char comm[TASK_COMM_LEN];
573
574 trace_find_cmdline(entry->pid, comm);
575
576 trace_seq_printf(
577 s, "%16s %5d %3d %d %08x %08lx ",
578 comm, entry->pid, iter->cpu, entry->flags,
579 entry->preempt_count, iter->idx);
580 } else {
581 lat_print_generic(s, entry, iter->cpu);
582 }
583
584 lat_print_timestamp(iter, next_ts);
585
586 return !trace_seq_has_overflowed(s);
587}
588
589static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
590
591static int task_state_char(unsigned long state)
592{
593 int bit = state ? __ffs(state) + 1 : 0;
594
595 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
596}
597
598/**
599 * ftrace_find_event - find a registered event
600 * @type: the type of event to look for
601 *
602 * Returns an event of type @type otherwise NULL
603 * Called with trace_event_read_lock() held.
604 */
605struct trace_event *ftrace_find_event(int type)
606{
607 struct trace_event *event;
608 unsigned key;
609
610 key = type & (EVENT_HASHSIZE - 1);
611
612 hlist_for_each_entry(event, &event_hash[key], node) {
613 if (event->type == type)
614 return event;
615 }
616
617 return NULL;
618}
619
620static LIST_HEAD(ftrace_event_list);
621
622static int trace_search_list(struct list_head **list)
623{
624 struct trace_event *e;
625 int last = __TRACE_LAST_TYPE;
626
627 if (list_empty(&ftrace_event_list)) {
628 *list = &ftrace_event_list;
629 return last + 1;
630 }
631
632 /*
633 * We used up all possible max events,
634 * lets see if somebody freed one.
635 */
636 list_for_each_entry(e, &ftrace_event_list, list) {
637 if (e->type != last + 1)
638 break;
639 last++;
640 }
641
642 /* Did we used up all 65 thousand events??? */
643 if ((last + 1) > TRACE_EVENT_TYPE_MAX)
644 return 0;
645
646 *list = &e->list;
647 return last + 1;
648}
649
650void trace_event_read_lock(void)
651{
652 down_read(&trace_event_sem);
653}
654
655void trace_event_read_unlock(void)
656{
657 up_read(&trace_event_sem);
658}
659
660/**
661 * register_trace_event - register output for an event type
662 * @event: the event type to register
663 *
664 * Event types are stored in a hash and this hash is used to
665 * find a way to print an event. If the @event->type is set
666 * then it will use that type, otherwise it will assign a
667 * type to use.
668 *
669 * If you assign your own type, please make sure it is added
670 * to the trace_type enum in trace.h, to avoid collisions
671 * with the dynamic types.
672 *
673 * Returns the event type number or zero on error.
674 */
675int register_trace_event(struct trace_event *event)
676{
677 unsigned key;
678 int ret = 0;
679
680 down_write(&trace_event_sem);
681
682 if (WARN_ON(!event))
683 goto out;
684
685 if (WARN_ON(!event->funcs))
686 goto out;
687
688 INIT_LIST_HEAD(&event->list);
689
690 if (!event->type) {
691 struct list_head *list = NULL;
692
693 if (next_event_type > TRACE_EVENT_TYPE_MAX) {
694
695 event->type = trace_search_list(&list);
696 if (!event->type)
697 goto out;
698
699 } else {
700
701 event->type = next_event_type++;
702 list = &ftrace_event_list;
703 }
704
705 if (WARN_ON(ftrace_find_event(event->type)))
706 goto out;
707
708 list_add_tail(&event->list, list);
709
710 } else if (event->type > __TRACE_LAST_TYPE) {
711 printk(KERN_WARNING "Need to add type to trace.h\n");
712 WARN_ON(1);
713 goto out;
714 } else {
715 /* Is this event already used */
716 if (ftrace_find_event(event->type))
717 goto out;
718 }
719
720 if (event->funcs->trace == NULL)
721 event->funcs->trace = trace_nop_print;
722 if (event->funcs->raw == NULL)
723 event->funcs->raw = trace_nop_print;
724 if (event->funcs->hex == NULL)
725 event->funcs->hex = trace_nop_print;
726 if (event->funcs->binary == NULL)
727 event->funcs->binary = trace_nop_print;
728
729 key = event->type & (EVENT_HASHSIZE - 1);
730
731 hlist_add_head(&event->node, &event_hash[key]);
732
733 ret = event->type;
734 out:
735 up_write(&trace_event_sem);
736
737 return ret;
738}
739EXPORT_SYMBOL_GPL(register_trace_event);
740
741/*
742 * Used by module code with the trace_event_sem held for write.
743 */
744int __unregister_trace_event(struct trace_event *event)
745{
746 hlist_del(&event->node);
747 list_del(&event->list);
748 return 0;
749}
750
751/**
752 * unregister_trace_event - remove a no longer used event
753 * @event: the event to remove
754 */
755int unregister_trace_event(struct trace_event *event)
756{
757 down_write(&trace_event_sem);
758 __unregister_trace_event(event);
759 up_write(&trace_event_sem);
760
761 return 0;
762}
763EXPORT_SYMBOL_GPL(unregister_trace_event);
764
765/*
766 * Standard events
767 */
768
769enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
770 struct trace_event *event)
771{
772 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
773
774 return trace_handle_return(&iter->seq);
775}
776
777/* TRACE_FN */
778static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
779 struct trace_event *event)
780{
781 struct ftrace_entry *field;
782 struct trace_seq *s = &iter->seq;
783
784 trace_assign_type(field, iter->ent);
785
786 seq_print_ip_sym(s, field->ip, flags);
787
788 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
789 trace_seq_puts(s, " <-");
790 seq_print_ip_sym(s, field->parent_ip, flags);
791 }
792
793 trace_seq_putc(s, '\n');
794
795 return trace_handle_return(s);
796}
797
798static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
799 struct trace_event *event)
800{
801 struct ftrace_entry *field;
802
803 trace_assign_type(field, iter->ent);
804
805 trace_seq_printf(&iter->seq, "%lx %lx\n",
806 field->ip,
807 field->parent_ip);
808
809 return trace_handle_return(&iter->seq);
810}
811
812static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
813 struct trace_event *event)
814{
815 struct ftrace_entry *field;
816 struct trace_seq *s = &iter->seq;
817
818 trace_assign_type(field, iter->ent);
819
820 SEQ_PUT_HEX_FIELD(s, field->ip);
821 SEQ_PUT_HEX_FIELD(s, field->parent_ip);
822
823 return trace_handle_return(s);
824}
825
826static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
827 struct trace_event *event)
828{
829 struct ftrace_entry *field;
830 struct trace_seq *s = &iter->seq;
831
832 trace_assign_type(field, iter->ent);
833
834 SEQ_PUT_FIELD(s, field->ip);
835 SEQ_PUT_FIELD(s, field->parent_ip);
836
837 return trace_handle_return(s);
838}
839
840static struct trace_event_functions trace_fn_funcs = {
841 .trace = trace_fn_trace,
842 .raw = trace_fn_raw,
843 .hex = trace_fn_hex,
844 .binary = trace_fn_bin,
845};
846
847static struct trace_event trace_fn_event = {
848 .type = TRACE_FN,
849 .funcs = &trace_fn_funcs,
850};
851
852/* TRACE_CTX an TRACE_WAKE */
853static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
854 char *delim)
855{
856 struct ctx_switch_entry *field;
857 char comm[TASK_COMM_LEN];
858 int S, T;
859
860
861 trace_assign_type(field, iter->ent);
862
863 T = task_state_char(field->next_state);
864 S = task_state_char(field->prev_state);
865 trace_find_cmdline(field->next_pid, comm);
866 trace_seq_printf(&iter->seq,
867 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
868 field->prev_pid,
869 field->prev_prio,
870 S, delim,
871 field->next_cpu,
872 field->next_pid,
873 field->next_prio,
874 T, comm);
875
876 return trace_handle_return(&iter->seq);
877}
878
879static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
880 struct trace_event *event)
881{
882 return trace_ctxwake_print(iter, "==>");
883}
884
885static enum print_line_t trace_wake_print(struct trace_iterator *iter,
886 int flags, struct trace_event *event)
887{
888 return trace_ctxwake_print(iter, " +");
889}
890
891static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
892{
893 struct ctx_switch_entry *field;
894 int T;
895
896 trace_assign_type(field, iter->ent);
897
898 if (!S)
899 S = task_state_char(field->prev_state);
900 T = task_state_char(field->next_state);
901 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
902 field->prev_pid,
903 field->prev_prio,
904 S,
905 field->next_cpu,
906 field->next_pid,
907 field->next_prio,
908 T);
909
910 return trace_handle_return(&iter->seq);
911}
912
913static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
914 struct trace_event *event)
915{
916 return trace_ctxwake_raw(iter, 0);
917}
918
919static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
920 struct trace_event *event)
921{
922 return trace_ctxwake_raw(iter, '+');
923}
924
925
926static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
927{
928 struct ctx_switch_entry *field;
929 struct trace_seq *s = &iter->seq;
930 int T;
931
932 trace_assign_type(field, iter->ent);
933
934 if (!S)
935 S = task_state_char(field->prev_state);
936 T = task_state_char(field->next_state);
937
938 SEQ_PUT_HEX_FIELD(s, field->prev_pid);
939 SEQ_PUT_HEX_FIELD(s, field->prev_prio);
940 SEQ_PUT_HEX_FIELD(s, S);
941 SEQ_PUT_HEX_FIELD(s, field->next_cpu);
942 SEQ_PUT_HEX_FIELD(s, field->next_pid);
943 SEQ_PUT_HEX_FIELD(s, field->next_prio);
944 SEQ_PUT_HEX_FIELD(s, T);
945
946 return trace_handle_return(s);
947}
948
949static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
950 struct trace_event *event)
951{
952 return trace_ctxwake_hex(iter, 0);
953}
954
955static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
956 struct trace_event *event)
957{
958 return trace_ctxwake_hex(iter, '+');
959}
960
961static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
962 int flags, struct trace_event *event)
963{
964 struct ctx_switch_entry *field;
965 struct trace_seq *s = &iter->seq;
966
967 trace_assign_type(field, iter->ent);
968
969 SEQ_PUT_FIELD(s, field->prev_pid);
970 SEQ_PUT_FIELD(s, field->prev_prio);
971 SEQ_PUT_FIELD(s, field->prev_state);
972 SEQ_PUT_FIELD(s, field->next_cpu);
973 SEQ_PUT_FIELD(s, field->next_pid);
974 SEQ_PUT_FIELD(s, field->next_prio);
975 SEQ_PUT_FIELD(s, field->next_state);
976
977 return trace_handle_return(s);
978}
979
980static struct trace_event_functions trace_ctx_funcs = {
981 .trace = trace_ctx_print,
982 .raw = trace_ctx_raw,
983 .hex = trace_ctx_hex,
984 .binary = trace_ctxwake_bin,
985};
986
987static struct trace_event trace_ctx_event = {
988 .type = TRACE_CTX,
989 .funcs = &trace_ctx_funcs,
990};
991
992static struct trace_event_functions trace_wake_funcs = {
993 .trace = trace_wake_print,
994 .raw = trace_wake_raw,
995 .hex = trace_wake_hex,
996 .binary = trace_ctxwake_bin,
997};
998
999static struct trace_event trace_wake_event = {
1000 .type = TRACE_WAKE,
1001 .funcs = &trace_wake_funcs,
1002};
1003
1004/* TRACE_STACK */
1005
1006static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1007 int flags, struct trace_event *event)
1008{
1009 struct stack_entry *field;
1010 struct trace_seq *s = &iter->seq;
1011 unsigned long *p;
1012 unsigned long *end;
1013
1014 trace_assign_type(field, iter->ent);
1015 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1016
1017 trace_seq_puts(s, "<stack trace>\n");
1018
1019 for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1020
1021 if (trace_seq_has_overflowed(s))
1022 break;
1023
1024 trace_seq_puts(s, " => ");
1025 seq_print_ip_sym(s, *p, flags);
1026 trace_seq_putc(s, '\n');
1027 }
1028
1029 return trace_handle_return(s);
1030}
1031
1032static struct trace_event_functions trace_stack_funcs = {
1033 .trace = trace_stack_print,
1034};
1035
1036static struct trace_event trace_stack_event = {
1037 .type = TRACE_STACK,
1038 .funcs = &trace_stack_funcs,
1039};
1040
1041/* TRACE_USER_STACK */
1042static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1043 int flags, struct trace_event *event)
1044{
1045 struct trace_array *tr = iter->tr;
1046 struct userstack_entry *field;
1047 struct trace_seq *s = &iter->seq;
1048 struct mm_struct *mm = NULL;
1049 unsigned int i;
1050
1051 trace_assign_type(field, iter->ent);
1052
1053 trace_seq_puts(s, "<user stack trace>\n");
1054
1055 if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
1056 struct task_struct *task;
1057 /*
1058 * we do the lookup on the thread group leader,
1059 * since individual threads might have already quit!
1060 */
1061 rcu_read_lock();
1062 task = find_task_by_vpid(field->tgid);
1063 if (task)
1064 mm = get_task_mm(task);
1065 rcu_read_unlock();
1066 }
1067
1068 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1069 unsigned long ip = field->caller[i];
1070
1071 if (ip == ULONG_MAX || trace_seq_has_overflowed(s))
1072 break;
1073
1074 trace_seq_puts(s, " => ");
1075
1076 if (!ip) {
1077 trace_seq_puts(s, "??");
1078 trace_seq_putc(s, '\n');
1079 continue;
1080 }
1081
1082 seq_print_user_ip(s, mm, ip, flags);
1083 trace_seq_putc(s, '\n');
1084 }
1085
1086 if (mm)
1087 mmput(mm);
1088
1089 return trace_handle_return(s);
1090}
1091
1092static struct trace_event_functions trace_user_stack_funcs = {
1093 .trace = trace_user_stack_print,
1094};
1095
1096static struct trace_event trace_user_stack_event = {
1097 .type = TRACE_USER_STACK,
1098 .funcs = &trace_user_stack_funcs,
1099};
1100
1101/* TRACE_BPUTS */
1102static enum print_line_t
1103trace_bputs_print(struct trace_iterator *iter, int flags,
1104 struct trace_event *event)
1105{
1106 struct trace_entry *entry = iter->ent;
1107 struct trace_seq *s = &iter->seq;
1108 struct bputs_entry *field;
1109
1110 trace_assign_type(field, entry);
1111
1112 seq_print_ip_sym(s, field->ip, flags);
1113 trace_seq_puts(s, ": ");
1114 trace_seq_puts(s, field->str);
1115
1116 return trace_handle_return(s);
1117}
1118
1119
1120static enum print_line_t
1121trace_bputs_raw(struct trace_iterator *iter, int flags,
1122 struct trace_event *event)
1123{
1124 struct bputs_entry *field;
1125 struct trace_seq *s = &iter->seq;
1126
1127 trace_assign_type(field, iter->ent);
1128
1129 trace_seq_printf(s, ": %lx : ", field->ip);
1130 trace_seq_puts(s, field->str);
1131
1132 return trace_handle_return(s);
1133}
1134
1135static struct trace_event_functions trace_bputs_funcs = {
1136 .trace = trace_bputs_print,
1137 .raw = trace_bputs_raw,
1138};
1139
1140static struct trace_event trace_bputs_event = {
1141 .type = TRACE_BPUTS,
1142 .funcs = &trace_bputs_funcs,
1143};
1144
1145/* TRACE_BPRINT */
1146static enum print_line_t
1147trace_bprint_print(struct trace_iterator *iter, int flags,
1148 struct trace_event *event)
1149{
1150 struct trace_entry *entry = iter->ent;
1151 struct trace_seq *s = &iter->seq;
1152 struct bprint_entry *field;
1153
1154 trace_assign_type(field, entry);
1155
1156 seq_print_ip_sym(s, field->ip, flags);
1157 trace_seq_puts(s, ": ");
1158 trace_seq_bprintf(s, field->fmt, field->buf);
1159
1160 return trace_handle_return(s);
1161}
1162
1163
1164static enum print_line_t
1165trace_bprint_raw(struct trace_iterator *iter, int flags,
1166 struct trace_event *event)
1167{
1168 struct bprint_entry *field;
1169 struct trace_seq *s = &iter->seq;
1170
1171 trace_assign_type(field, iter->ent);
1172
1173 trace_seq_printf(s, ": %lx : ", field->ip);
1174 trace_seq_bprintf(s, field->fmt, field->buf);
1175
1176 return trace_handle_return(s);
1177}
1178
1179static struct trace_event_functions trace_bprint_funcs = {
1180 .trace = trace_bprint_print,
1181 .raw = trace_bprint_raw,
1182};
1183
1184static struct trace_event trace_bprint_event = {
1185 .type = TRACE_BPRINT,
1186 .funcs = &trace_bprint_funcs,
1187};
1188
1189/* TRACE_PRINT */
1190static enum print_line_t trace_print_print(struct trace_iterator *iter,
1191 int flags, struct trace_event *event)
1192{
1193 struct print_entry *field;
1194 struct trace_seq *s = &iter->seq;
1195
1196 trace_assign_type(field, iter->ent);
1197
1198 seq_print_ip_sym(s, field->ip, flags);
1199 trace_seq_printf(s, ": %s", field->buf);
1200
1201 return trace_handle_return(s);
1202}
1203
1204static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1205 struct trace_event *event)
1206{
1207 struct print_entry *field;
1208
1209 trace_assign_type(field, iter->ent);
1210
1211 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1212
1213 return trace_handle_return(&iter->seq);
1214}
1215
1216static struct trace_event_functions trace_print_funcs = {
1217 .trace = trace_print_print,
1218 .raw = trace_print_raw,
1219};
1220
1221static struct trace_event trace_print_event = {
1222 .type = TRACE_PRINT,
1223 .funcs = &trace_print_funcs,
1224};
1225
1226
1227static struct trace_event *events[] __initdata = {
1228 &trace_fn_event,
1229 &trace_ctx_event,
1230 &trace_wake_event,
1231 &trace_stack_event,
1232 &trace_user_stack_event,
1233 &trace_bputs_event,
1234 &trace_bprint_event,
1235 &trace_print_event,
1236 NULL
1237};
1238
1239__init static int init_events(void)
1240{
1241 struct trace_event *event;
1242 int i, ret;
1243
1244 for (i = 0; events[i]; i++) {
1245 event = events[i];
1246
1247 ret = register_trace_event(event);
1248 if (!ret) {
1249 printk(KERN_WARNING "event %d failed to register\n",
1250 event->type);
1251 WARN_ON_ONCE(1);
1252 }
1253 }
1254
1255 return 0;
1256}
1257early_initcall(init_events);