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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/sched/clock.h>
12#include <linux/sched/mm.h>
13
14#include "trace_output.h"
15
16/* must be a power of 2 */
17#define EVENT_HASHSIZE 128
18
19DECLARE_RWSEM(trace_event_sem);
20
21static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
22
23static int next_event_type = __TRACE_LAST_TYPE;
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 trace_seq_printf(p, fmt, min(buf_len - i, 16), &buf[i]);
226 trace_seq_putc(p, 0);
227
228 return ret;
229}
230EXPORT_SYMBOL(trace_print_hex_seq);
231
232const char *
233trace_print_array_seq(struct trace_seq *p, const void *buf, int count,
234 size_t el_size)
235{
236 const char *ret = trace_seq_buffer_ptr(p);
237 const char *prefix = "";
238 void *ptr = (void *)buf;
239 size_t buf_len = count * el_size;
240
241 trace_seq_putc(p, '{');
242
243 while (ptr < buf + buf_len) {
244 switch (el_size) {
245 case 1:
246 trace_seq_printf(p, "%s0x%x", prefix,
247 *(u8 *)ptr);
248 break;
249 case 2:
250 trace_seq_printf(p, "%s0x%x", prefix,
251 *(u16 *)ptr);
252 break;
253 case 4:
254 trace_seq_printf(p, "%s0x%x", prefix,
255 *(u32 *)ptr);
256 break;
257 case 8:
258 trace_seq_printf(p, "%s0x%llx", prefix,
259 *(u64 *)ptr);
260 break;
261 default:
262 trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
263 *(u8 *)ptr);
264 el_size = 1;
265 }
266 prefix = ",";
267 ptr += el_size;
268 }
269
270 trace_seq_putc(p, '}');
271 trace_seq_putc(p, 0);
272
273 return ret;
274}
275EXPORT_SYMBOL(trace_print_array_seq);
276
277const char *
278trace_print_hex_dump_seq(struct trace_seq *p, const char *prefix_str,
279 int prefix_type, int rowsize, int groupsize,
280 const void *buf, size_t len, bool ascii)
281{
282 const char *ret = trace_seq_buffer_ptr(p);
283
284 trace_seq_putc(p, '\n');
285 trace_seq_hex_dump(p, prefix_str, prefix_type,
286 rowsize, groupsize, buf, len, ascii);
287 trace_seq_putc(p, 0);
288 return ret;
289}
290EXPORT_SYMBOL(trace_print_hex_dump_seq);
291
292int trace_raw_output_prep(struct trace_iterator *iter,
293 struct trace_event *trace_event)
294{
295 struct trace_event_call *event;
296 struct trace_seq *s = &iter->seq;
297 struct trace_seq *p = &iter->tmp_seq;
298 struct trace_entry *entry;
299
300 event = container_of(trace_event, struct trace_event_call, event);
301 entry = iter->ent;
302
303 if (entry->type != event->event.type) {
304 WARN_ON_ONCE(1);
305 return TRACE_TYPE_UNHANDLED;
306 }
307
308 trace_seq_init(p);
309 trace_seq_printf(s, "%s: ", trace_event_name(event));
310
311 return trace_handle_return(s);
312}
313EXPORT_SYMBOL(trace_raw_output_prep);
314
315static int trace_output_raw(struct trace_iterator *iter, char *name,
316 char *fmt, va_list ap)
317{
318 struct trace_seq *s = &iter->seq;
319
320 trace_seq_printf(s, "%s: ", name);
321 trace_seq_vprintf(s, fmt, ap);
322
323 return trace_handle_return(s);
324}
325
326int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
327{
328 va_list ap;
329 int ret;
330
331 va_start(ap, fmt);
332 ret = trace_output_raw(iter, name, fmt, ap);
333 va_end(ap);
334
335 return ret;
336}
337EXPORT_SYMBOL_GPL(trace_output_call);
338
339#ifdef CONFIG_KRETPROBES
340static inline const char *kretprobed(const char *name)
341{
342 static const char tramp_name[] = "kretprobe_trampoline";
343 int size = sizeof(tramp_name);
344
345 if (strncmp(tramp_name, name, size) == 0)
346 return "[unknown/kretprobe'd]";
347 return name;
348}
349#else
350static inline const char *kretprobed(const char *name)
351{
352 return name;
353}
354#endif /* CONFIG_KRETPROBES */
355
356static void
357seq_print_sym(struct trace_seq *s, unsigned long address, bool offset)
358{
359#ifdef CONFIG_KALLSYMS
360 char str[KSYM_SYMBOL_LEN];
361 const char *name;
362
363 if (offset)
364 sprint_symbol(str, address);
365 else
366 kallsyms_lookup(address, NULL, NULL, NULL, str);
367 name = kretprobed(str);
368
369 if (name && strlen(name)) {
370 trace_seq_puts(s, name);
371 return;
372 }
373#endif
374 trace_seq_printf(s, "0x%08lx", address);
375}
376
377#ifndef CONFIG_64BIT
378# define IP_FMT "%08lx"
379#else
380# define IP_FMT "%016lx"
381#endif
382
383static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
384 unsigned long ip, unsigned long sym_flags)
385{
386 struct file *file = NULL;
387 unsigned long vmstart = 0;
388 int ret = 1;
389
390 if (s->full)
391 return 0;
392
393 if (mm) {
394 const struct vm_area_struct *vma;
395
396 mmap_read_lock(mm);
397 vma = find_vma(mm, ip);
398 if (vma) {
399 file = vma->vm_file;
400 vmstart = vma->vm_start;
401 }
402 if (file) {
403 ret = trace_seq_path(s, &file->f_path);
404 if (ret)
405 trace_seq_printf(s, "[+0x%lx]",
406 ip - vmstart);
407 }
408 mmap_read_unlock(mm);
409 }
410 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
411 trace_seq_printf(s, " <" IP_FMT ">", ip);
412 return !trace_seq_has_overflowed(s);
413}
414
415int
416seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
417{
418 if (!ip) {
419 trace_seq_putc(s, '0');
420 goto out;
421 }
422
423 seq_print_sym(s, ip, sym_flags & TRACE_ITER_SYM_OFFSET);
424
425 if (sym_flags & TRACE_ITER_SYM_ADDR)
426 trace_seq_printf(s, " <" IP_FMT ">", ip);
427
428 out:
429 return !trace_seq_has_overflowed(s);
430}
431
432/**
433 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
434 * @s: trace seq struct to write to
435 * @entry: The trace entry field from the ring buffer
436 *
437 * Prints the generic fields of irqs off, in hard or softirq, preempt
438 * count.
439 */
440int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
441{
442 char hardsoft_irq;
443 char need_resched;
444 char irqs_off;
445 int hardirq;
446 int softirq;
447 int nmi;
448
449 nmi = entry->flags & TRACE_FLAG_NMI;
450 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
451 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
452
453 irqs_off =
454 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
455 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
456 '.';
457
458 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
459 TRACE_FLAG_PREEMPT_RESCHED)) {
460 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
461 need_resched = 'N';
462 break;
463 case TRACE_FLAG_NEED_RESCHED:
464 need_resched = 'n';
465 break;
466 case TRACE_FLAG_PREEMPT_RESCHED:
467 need_resched = 'p';
468 break;
469 default:
470 need_resched = '.';
471 break;
472 }
473
474 hardsoft_irq =
475 (nmi && hardirq) ? 'Z' :
476 nmi ? 'z' :
477 (hardirq && softirq) ? 'H' :
478 hardirq ? 'h' :
479 softirq ? 's' :
480 '.' ;
481
482 trace_seq_printf(s, "%c%c%c",
483 irqs_off, need_resched, hardsoft_irq);
484
485 if (entry->preempt_count)
486 trace_seq_printf(s, "%x", entry->preempt_count);
487 else
488 trace_seq_putc(s, '.');
489
490 return !trace_seq_has_overflowed(s);
491}
492
493static int
494lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
495{
496 char comm[TASK_COMM_LEN];
497
498 trace_find_cmdline(entry->pid, comm);
499
500 trace_seq_printf(s, "%8.8s-%-7d %3d",
501 comm, entry->pid, cpu);
502
503 return trace_print_lat_fmt(s, entry);
504}
505
506#undef MARK
507#define MARK(v, s) {.val = v, .sym = s}
508/* trace overhead mark */
509static const struct trace_mark {
510 unsigned long long val; /* unit: nsec */
511 char sym;
512} mark[] = {
513 MARK(1000000000ULL , '$'), /* 1 sec */
514 MARK(100000000ULL , '@'), /* 100 msec */
515 MARK(10000000ULL , '*'), /* 10 msec */
516 MARK(1000000ULL , '#'), /* 1000 usecs */
517 MARK(100000ULL , '!'), /* 100 usecs */
518 MARK(10000ULL , '+'), /* 10 usecs */
519};
520#undef MARK
521
522char trace_find_mark(unsigned long long d)
523{
524 int i;
525 int size = ARRAY_SIZE(mark);
526
527 for (i = 0; i < size; i++) {
528 if (d > mark[i].val)
529 break;
530 }
531
532 return (i == size) ? ' ' : mark[i].sym;
533}
534
535static int
536lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
537{
538 struct trace_array *tr = iter->tr;
539 unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
540 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
541 unsigned long long abs_ts = iter->ts - iter->array_buffer->time_start;
542 unsigned long long rel_ts = next_ts - iter->ts;
543 struct trace_seq *s = &iter->seq;
544
545 if (in_ns) {
546 abs_ts = ns2usecs(abs_ts);
547 rel_ts = ns2usecs(rel_ts);
548 }
549
550 if (verbose && in_ns) {
551 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
552 unsigned long abs_msec = (unsigned long)abs_ts;
553 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
554 unsigned long rel_msec = (unsigned long)rel_ts;
555
556 trace_seq_printf(
557 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
558 ns2usecs(iter->ts),
559 abs_msec, abs_usec,
560 rel_msec, rel_usec);
561
562 } else if (verbose && !in_ns) {
563 trace_seq_printf(
564 s, "[%016llx] %lld (+%lld): ",
565 iter->ts, abs_ts, rel_ts);
566
567 } else if (!verbose && in_ns) {
568 trace_seq_printf(
569 s, " %4lldus%c: ",
570 abs_ts,
571 trace_find_mark(rel_ts * NSEC_PER_USEC));
572
573 } else { /* !verbose && !in_ns */
574 trace_seq_printf(s, " %4lld: ", abs_ts);
575 }
576
577 return !trace_seq_has_overflowed(s);
578}
579
580int trace_print_context(struct trace_iterator *iter)
581{
582 struct trace_array *tr = iter->tr;
583 struct trace_seq *s = &iter->seq;
584 struct trace_entry *entry = iter->ent;
585 unsigned long long t;
586 unsigned long secs, usec_rem;
587 char comm[TASK_COMM_LEN];
588
589 trace_find_cmdline(entry->pid, comm);
590
591 trace_seq_printf(s, "%16s-%-7d ", comm, entry->pid);
592
593 if (tr->trace_flags & TRACE_ITER_RECORD_TGID) {
594 unsigned int tgid = trace_find_tgid(entry->pid);
595
596 if (!tgid)
597 trace_seq_printf(s, "(-------) ");
598 else
599 trace_seq_printf(s, "(%7d) ", tgid);
600 }
601
602 trace_seq_printf(s, "[%03d] ", iter->cpu);
603
604 if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
605 trace_print_lat_fmt(s, entry);
606
607 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
608 t = ns2usecs(iter->ts);
609 usec_rem = do_div(t, USEC_PER_SEC);
610 secs = (unsigned long)t;
611 trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
612 } else
613 trace_seq_printf(s, " %12llu: ", iter->ts);
614
615 return !trace_seq_has_overflowed(s);
616}
617
618int trace_print_lat_context(struct trace_iterator *iter)
619{
620 struct trace_entry *entry, *next_entry;
621 struct trace_array *tr = iter->tr;
622 struct trace_seq *s = &iter->seq;
623 unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
624 u64 next_ts;
625
626 next_entry = trace_find_next_entry(iter, NULL, &next_ts);
627 if (!next_entry)
628 next_ts = iter->ts;
629
630 /* trace_find_next_entry() may change iter->ent */
631 entry = iter->ent;
632
633 if (verbose) {
634 char comm[TASK_COMM_LEN];
635
636 trace_find_cmdline(entry->pid, comm);
637
638 trace_seq_printf(
639 s, "%16s %7d %3d %d %08x %08lx ",
640 comm, entry->pid, iter->cpu, entry->flags,
641 entry->preempt_count, iter->idx);
642 } else {
643 lat_print_generic(s, entry, iter->cpu);
644 }
645
646 lat_print_timestamp(iter, next_ts);
647
648 return !trace_seq_has_overflowed(s);
649}
650
651/**
652 * ftrace_find_event - find a registered event
653 * @type: the type of event to look for
654 *
655 * Returns an event of type @type otherwise NULL
656 * Called with trace_event_read_lock() held.
657 */
658struct trace_event *ftrace_find_event(int type)
659{
660 struct trace_event *event;
661 unsigned key;
662
663 key = type & (EVENT_HASHSIZE - 1);
664
665 hlist_for_each_entry(event, &event_hash[key], node) {
666 if (event->type == type)
667 return event;
668 }
669
670 return NULL;
671}
672
673static LIST_HEAD(ftrace_event_list);
674
675static int trace_search_list(struct list_head **list)
676{
677 struct trace_event *e;
678 int next = __TRACE_LAST_TYPE;
679
680 if (list_empty(&ftrace_event_list)) {
681 *list = &ftrace_event_list;
682 return next;
683 }
684
685 /*
686 * We used up all possible max events,
687 * lets see if somebody freed one.
688 */
689 list_for_each_entry(e, &ftrace_event_list, list) {
690 if (e->type != next)
691 break;
692 next++;
693 }
694
695 /* Did we used up all 65 thousand events??? */
696 if (next > TRACE_EVENT_TYPE_MAX)
697 return 0;
698
699 *list = &e->list;
700 return next;
701}
702
703void trace_event_read_lock(void)
704{
705 down_read(&trace_event_sem);
706}
707
708void trace_event_read_unlock(void)
709{
710 up_read(&trace_event_sem);
711}
712
713/**
714 * register_trace_event - register output for an event type
715 * @event: the event type to register
716 *
717 * Event types are stored in a hash and this hash is used to
718 * find a way to print an event. If the @event->type is set
719 * then it will use that type, otherwise it will assign a
720 * type to use.
721 *
722 * If you assign your own type, please make sure it is added
723 * to the trace_type enum in trace.h, to avoid collisions
724 * with the dynamic types.
725 *
726 * Returns the event type number or zero on error.
727 */
728int register_trace_event(struct trace_event *event)
729{
730 unsigned key;
731 int ret = 0;
732
733 down_write(&trace_event_sem);
734
735 if (WARN_ON(!event))
736 goto out;
737
738 if (WARN_ON(!event->funcs))
739 goto out;
740
741 INIT_LIST_HEAD(&event->list);
742
743 if (!event->type) {
744 struct list_head *list = NULL;
745
746 if (next_event_type > TRACE_EVENT_TYPE_MAX) {
747
748 event->type = trace_search_list(&list);
749 if (!event->type)
750 goto out;
751
752 } else {
753
754 event->type = next_event_type++;
755 list = &ftrace_event_list;
756 }
757
758 if (WARN_ON(ftrace_find_event(event->type)))
759 goto out;
760
761 list_add_tail(&event->list, list);
762
763 } else if (event->type > __TRACE_LAST_TYPE) {
764 printk(KERN_WARNING "Need to add type to trace.h\n");
765 WARN_ON(1);
766 goto out;
767 } else {
768 /* Is this event already used */
769 if (ftrace_find_event(event->type))
770 goto out;
771 }
772
773 if (event->funcs->trace == NULL)
774 event->funcs->trace = trace_nop_print;
775 if (event->funcs->raw == NULL)
776 event->funcs->raw = trace_nop_print;
777 if (event->funcs->hex == NULL)
778 event->funcs->hex = trace_nop_print;
779 if (event->funcs->binary == NULL)
780 event->funcs->binary = trace_nop_print;
781
782 key = event->type & (EVENT_HASHSIZE - 1);
783
784 hlist_add_head(&event->node, &event_hash[key]);
785
786 ret = event->type;
787 out:
788 up_write(&trace_event_sem);
789
790 return ret;
791}
792EXPORT_SYMBOL_GPL(register_trace_event);
793
794/*
795 * Used by module code with the trace_event_sem held for write.
796 */
797int __unregister_trace_event(struct trace_event *event)
798{
799 hlist_del(&event->node);
800 list_del(&event->list);
801 return 0;
802}
803
804/**
805 * unregister_trace_event - remove a no longer used event
806 * @event: the event to remove
807 */
808int unregister_trace_event(struct trace_event *event)
809{
810 down_write(&trace_event_sem);
811 __unregister_trace_event(event);
812 up_write(&trace_event_sem);
813
814 return 0;
815}
816EXPORT_SYMBOL_GPL(unregister_trace_event);
817
818/*
819 * Standard events
820 */
821
822enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
823 struct trace_event *event)
824{
825 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
826
827 return trace_handle_return(&iter->seq);
828}
829
830/* TRACE_FN */
831static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
832 struct trace_event *event)
833{
834 struct ftrace_entry *field;
835 struct trace_seq *s = &iter->seq;
836
837 trace_assign_type(field, iter->ent);
838
839 seq_print_ip_sym(s, field->ip, flags);
840
841 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
842 trace_seq_puts(s, " <-");
843 seq_print_ip_sym(s, field->parent_ip, flags);
844 }
845
846 trace_seq_putc(s, '\n');
847
848 return trace_handle_return(s);
849}
850
851static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
852 struct trace_event *event)
853{
854 struct ftrace_entry *field;
855
856 trace_assign_type(field, iter->ent);
857
858 trace_seq_printf(&iter->seq, "%lx %lx\n",
859 field->ip,
860 field->parent_ip);
861
862 return trace_handle_return(&iter->seq);
863}
864
865static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
866 struct trace_event *event)
867{
868 struct ftrace_entry *field;
869 struct trace_seq *s = &iter->seq;
870
871 trace_assign_type(field, iter->ent);
872
873 SEQ_PUT_HEX_FIELD(s, field->ip);
874 SEQ_PUT_HEX_FIELD(s, field->parent_ip);
875
876 return trace_handle_return(s);
877}
878
879static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
880 struct trace_event *event)
881{
882 struct ftrace_entry *field;
883 struct trace_seq *s = &iter->seq;
884
885 trace_assign_type(field, iter->ent);
886
887 SEQ_PUT_FIELD(s, field->ip);
888 SEQ_PUT_FIELD(s, field->parent_ip);
889
890 return trace_handle_return(s);
891}
892
893static struct trace_event_functions trace_fn_funcs = {
894 .trace = trace_fn_trace,
895 .raw = trace_fn_raw,
896 .hex = trace_fn_hex,
897 .binary = trace_fn_bin,
898};
899
900static struct trace_event trace_fn_event = {
901 .type = TRACE_FN,
902 .funcs = &trace_fn_funcs,
903};
904
905/* TRACE_CTX an TRACE_WAKE */
906static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
907 char *delim)
908{
909 struct ctx_switch_entry *field;
910 char comm[TASK_COMM_LEN];
911 int S, T;
912
913
914 trace_assign_type(field, iter->ent);
915
916 T = task_index_to_char(field->next_state);
917 S = task_index_to_char(field->prev_state);
918 trace_find_cmdline(field->next_pid, comm);
919 trace_seq_printf(&iter->seq,
920 " %7d:%3d:%c %s [%03d] %7d:%3d:%c %s\n",
921 field->prev_pid,
922 field->prev_prio,
923 S, delim,
924 field->next_cpu,
925 field->next_pid,
926 field->next_prio,
927 T, comm);
928
929 return trace_handle_return(&iter->seq);
930}
931
932static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
933 struct trace_event *event)
934{
935 return trace_ctxwake_print(iter, "==>");
936}
937
938static enum print_line_t trace_wake_print(struct trace_iterator *iter,
939 int flags, struct trace_event *event)
940{
941 return trace_ctxwake_print(iter, " +");
942}
943
944static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
945{
946 struct ctx_switch_entry *field;
947 int T;
948
949 trace_assign_type(field, iter->ent);
950
951 if (!S)
952 S = task_index_to_char(field->prev_state);
953 T = task_index_to_char(field->next_state);
954 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
955 field->prev_pid,
956 field->prev_prio,
957 S,
958 field->next_cpu,
959 field->next_pid,
960 field->next_prio,
961 T);
962
963 return trace_handle_return(&iter->seq);
964}
965
966static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
967 struct trace_event *event)
968{
969 return trace_ctxwake_raw(iter, 0);
970}
971
972static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
973 struct trace_event *event)
974{
975 return trace_ctxwake_raw(iter, '+');
976}
977
978
979static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
980{
981 struct ctx_switch_entry *field;
982 struct trace_seq *s = &iter->seq;
983 int T;
984
985 trace_assign_type(field, iter->ent);
986
987 if (!S)
988 S = task_index_to_char(field->prev_state);
989 T = task_index_to_char(field->next_state);
990
991 SEQ_PUT_HEX_FIELD(s, field->prev_pid);
992 SEQ_PUT_HEX_FIELD(s, field->prev_prio);
993 SEQ_PUT_HEX_FIELD(s, S);
994 SEQ_PUT_HEX_FIELD(s, field->next_cpu);
995 SEQ_PUT_HEX_FIELD(s, field->next_pid);
996 SEQ_PUT_HEX_FIELD(s, field->next_prio);
997 SEQ_PUT_HEX_FIELD(s, T);
998
999 return trace_handle_return(s);
1000}
1001
1002static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1003 struct trace_event *event)
1004{
1005 return trace_ctxwake_hex(iter, 0);
1006}
1007
1008static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1009 struct trace_event *event)
1010{
1011 return trace_ctxwake_hex(iter, '+');
1012}
1013
1014static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1015 int flags, struct trace_event *event)
1016{
1017 struct ctx_switch_entry *field;
1018 struct trace_seq *s = &iter->seq;
1019
1020 trace_assign_type(field, iter->ent);
1021
1022 SEQ_PUT_FIELD(s, field->prev_pid);
1023 SEQ_PUT_FIELD(s, field->prev_prio);
1024 SEQ_PUT_FIELD(s, field->prev_state);
1025 SEQ_PUT_FIELD(s, field->next_cpu);
1026 SEQ_PUT_FIELD(s, field->next_pid);
1027 SEQ_PUT_FIELD(s, field->next_prio);
1028 SEQ_PUT_FIELD(s, field->next_state);
1029
1030 return trace_handle_return(s);
1031}
1032
1033static struct trace_event_functions trace_ctx_funcs = {
1034 .trace = trace_ctx_print,
1035 .raw = trace_ctx_raw,
1036 .hex = trace_ctx_hex,
1037 .binary = trace_ctxwake_bin,
1038};
1039
1040static struct trace_event trace_ctx_event = {
1041 .type = TRACE_CTX,
1042 .funcs = &trace_ctx_funcs,
1043};
1044
1045static struct trace_event_functions trace_wake_funcs = {
1046 .trace = trace_wake_print,
1047 .raw = trace_wake_raw,
1048 .hex = trace_wake_hex,
1049 .binary = trace_ctxwake_bin,
1050};
1051
1052static struct trace_event trace_wake_event = {
1053 .type = TRACE_WAKE,
1054 .funcs = &trace_wake_funcs,
1055};
1056
1057/* TRACE_STACK */
1058
1059static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1060 int flags, struct trace_event *event)
1061{
1062 struct stack_entry *field;
1063 struct trace_seq *s = &iter->seq;
1064 unsigned long *p;
1065 unsigned long *end;
1066
1067 trace_assign_type(field, iter->ent);
1068 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1069
1070 trace_seq_puts(s, "<stack trace>\n");
1071
1072 for (p = field->caller; p && p < end && *p != ULONG_MAX; p++) {
1073
1074 if (trace_seq_has_overflowed(s))
1075 break;
1076
1077 trace_seq_puts(s, " => ");
1078 seq_print_ip_sym(s, *p, flags);
1079 trace_seq_putc(s, '\n');
1080 }
1081
1082 return trace_handle_return(s);
1083}
1084
1085static struct trace_event_functions trace_stack_funcs = {
1086 .trace = trace_stack_print,
1087};
1088
1089static struct trace_event trace_stack_event = {
1090 .type = TRACE_STACK,
1091 .funcs = &trace_stack_funcs,
1092};
1093
1094/* TRACE_USER_STACK */
1095static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1096 int flags, struct trace_event *event)
1097{
1098 struct trace_array *tr = iter->tr;
1099 struct userstack_entry *field;
1100 struct trace_seq *s = &iter->seq;
1101 struct mm_struct *mm = NULL;
1102 unsigned int i;
1103
1104 trace_assign_type(field, iter->ent);
1105
1106 trace_seq_puts(s, "<user stack trace>\n");
1107
1108 if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
1109 struct task_struct *task;
1110 /*
1111 * we do the lookup on the thread group leader,
1112 * since individual threads might have already quit!
1113 */
1114 rcu_read_lock();
1115 task = find_task_by_vpid(field->tgid);
1116 if (task)
1117 mm = get_task_mm(task);
1118 rcu_read_unlock();
1119 }
1120
1121 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1122 unsigned long ip = field->caller[i];
1123
1124 if (!ip || trace_seq_has_overflowed(s))
1125 break;
1126
1127 trace_seq_puts(s, " => ");
1128 seq_print_user_ip(s, mm, ip, flags);
1129 trace_seq_putc(s, '\n');
1130 }
1131
1132 if (mm)
1133 mmput(mm);
1134
1135 return trace_handle_return(s);
1136}
1137
1138static struct trace_event_functions trace_user_stack_funcs = {
1139 .trace = trace_user_stack_print,
1140};
1141
1142static struct trace_event trace_user_stack_event = {
1143 .type = TRACE_USER_STACK,
1144 .funcs = &trace_user_stack_funcs,
1145};
1146
1147/* TRACE_HWLAT */
1148static enum print_line_t
1149trace_hwlat_print(struct trace_iterator *iter, int flags,
1150 struct trace_event *event)
1151{
1152 struct trace_entry *entry = iter->ent;
1153 struct trace_seq *s = &iter->seq;
1154 struct hwlat_entry *field;
1155
1156 trace_assign_type(field, entry);
1157
1158 trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld count:%d",
1159 field->seqnum,
1160 field->duration,
1161 field->outer_duration,
1162 (long long)field->timestamp.tv_sec,
1163 field->timestamp.tv_nsec, field->count);
1164
1165 if (field->nmi_count) {
1166 /*
1167 * The generic sched_clock() is not NMI safe, thus
1168 * we only record the count and not the time.
1169 */
1170 if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK))
1171 trace_seq_printf(s, " nmi-total:%llu",
1172 field->nmi_total_ts);
1173 trace_seq_printf(s, " nmi-count:%u",
1174 field->nmi_count);
1175 }
1176
1177 trace_seq_putc(s, '\n');
1178
1179 return trace_handle_return(s);
1180}
1181
1182
1183static enum print_line_t
1184trace_hwlat_raw(struct trace_iterator *iter, int flags,
1185 struct trace_event *event)
1186{
1187 struct hwlat_entry *field;
1188 struct trace_seq *s = &iter->seq;
1189
1190 trace_assign_type(field, iter->ent);
1191
1192 trace_seq_printf(s, "%llu %lld %lld %09ld %u\n",
1193 field->duration,
1194 field->outer_duration,
1195 (long long)field->timestamp.tv_sec,
1196 field->timestamp.tv_nsec,
1197 field->seqnum);
1198
1199 return trace_handle_return(s);
1200}
1201
1202static struct trace_event_functions trace_hwlat_funcs = {
1203 .trace = trace_hwlat_print,
1204 .raw = trace_hwlat_raw,
1205};
1206
1207static struct trace_event trace_hwlat_event = {
1208 .type = TRACE_HWLAT,
1209 .funcs = &trace_hwlat_funcs,
1210};
1211
1212/* TRACE_BPUTS */
1213static enum print_line_t
1214trace_bputs_print(struct trace_iterator *iter, int flags,
1215 struct trace_event *event)
1216{
1217 struct trace_entry *entry = iter->ent;
1218 struct trace_seq *s = &iter->seq;
1219 struct bputs_entry *field;
1220
1221 trace_assign_type(field, entry);
1222
1223 seq_print_ip_sym(s, field->ip, flags);
1224 trace_seq_puts(s, ": ");
1225 trace_seq_puts(s, field->str);
1226
1227 return trace_handle_return(s);
1228}
1229
1230
1231static enum print_line_t
1232trace_bputs_raw(struct trace_iterator *iter, int flags,
1233 struct trace_event *event)
1234{
1235 struct bputs_entry *field;
1236 struct trace_seq *s = &iter->seq;
1237
1238 trace_assign_type(field, iter->ent);
1239
1240 trace_seq_printf(s, ": %lx : ", field->ip);
1241 trace_seq_puts(s, field->str);
1242
1243 return trace_handle_return(s);
1244}
1245
1246static struct trace_event_functions trace_bputs_funcs = {
1247 .trace = trace_bputs_print,
1248 .raw = trace_bputs_raw,
1249};
1250
1251static struct trace_event trace_bputs_event = {
1252 .type = TRACE_BPUTS,
1253 .funcs = &trace_bputs_funcs,
1254};
1255
1256/* TRACE_BPRINT */
1257static enum print_line_t
1258trace_bprint_print(struct trace_iterator *iter, int flags,
1259 struct trace_event *event)
1260{
1261 struct trace_entry *entry = iter->ent;
1262 struct trace_seq *s = &iter->seq;
1263 struct bprint_entry *field;
1264
1265 trace_assign_type(field, entry);
1266
1267 seq_print_ip_sym(s, field->ip, flags);
1268 trace_seq_puts(s, ": ");
1269 trace_seq_bprintf(s, field->fmt, field->buf);
1270
1271 return trace_handle_return(s);
1272}
1273
1274
1275static enum print_line_t
1276trace_bprint_raw(struct trace_iterator *iter, int flags,
1277 struct trace_event *event)
1278{
1279 struct bprint_entry *field;
1280 struct trace_seq *s = &iter->seq;
1281
1282 trace_assign_type(field, iter->ent);
1283
1284 trace_seq_printf(s, ": %lx : ", field->ip);
1285 trace_seq_bprintf(s, field->fmt, field->buf);
1286
1287 return trace_handle_return(s);
1288}
1289
1290static struct trace_event_functions trace_bprint_funcs = {
1291 .trace = trace_bprint_print,
1292 .raw = trace_bprint_raw,
1293};
1294
1295static struct trace_event trace_bprint_event = {
1296 .type = TRACE_BPRINT,
1297 .funcs = &trace_bprint_funcs,
1298};
1299
1300/* TRACE_PRINT */
1301static enum print_line_t trace_print_print(struct trace_iterator *iter,
1302 int flags, struct trace_event *event)
1303{
1304 struct print_entry *field;
1305 struct trace_seq *s = &iter->seq;
1306
1307 trace_assign_type(field, iter->ent);
1308
1309 seq_print_ip_sym(s, field->ip, flags);
1310 trace_seq_printf(s, ": %s", field->buf);
1311
1312 return trace_handle_return(s);
1313}
1314
1315static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1316 struct trace_event *event)
1317{
1318 struct print_entry *field;
1319
1320 trace_assign_type(field, iter->ent);
1321
1322 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1323
1324 return trace_handle_return(&iter->seq);
1325}
1326
1327static struct trace_event_functions trace_print_funcs = {
1328 .trace = trace_print_print,
1329 .raw = trace_print_raw,
1330};
1331
1332static struct trace_event trace_print_event = {
1333 .type = TRACE_PRINT,
1334 .funcs = &trace_print_funcs,
1335};
1336
1337static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags,
1338 struct trace_event *event)
1339{
1340 struct raw_data_entry *field;
1341 int i;
1342
1343 trace_assign_type(field, iter->ent);
1344
1345 trace_seq_printf(&iter->seq, "# %x buf:", field->id);
1346
1347 for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++)
1348 trace_seq_printf(&iter->seq, " %02x",
1349 (unsigned char)field->buf[i]);
1350
1351 trace_seq_putc(&iter->seq, '\n');
1352
1353 return trace_handle_return(&iter->seq);
1354}
1355
1356static struct trace_event_functions trace_raw_data_funcs = {
1357 .trace = trace_raw_data,
1358 .raw = trace_raw_data,
1359};
1360
1361static struct trace_event trace_raw_data_event = {
1362 .type = TRACE_RAW_DATA,
1363 .funcs = &trace_raw_data_funcs,
1364};
1365
1366
1367static struct trace_event *events[] __initdata = {
1368 &trace_fn_event,
1369 &trace_ctx_event,
1370 &trace_wake_event,
1371 &trace_stack_event,
1372 &trace_user_stack_event,
1373 &trace_bputs_event,
1374 &trace_bprint_event,
1375 &trace_print_event,
1376 &trace_hwlat_event,
1377 &trace_raw_data_event,
1378 NULL
1379};
1380
1381__init static int init_events(void)
1382{
1383 struct trace_event *event;
1384 int i, ret;
1385
1386 for (i = 0; events[i]; i++) {
1387 event = events[i];
1388
1389 ret = register_trace_event(event);
1390 if (!ret) {
1391 printk(KERN_WARNING "event %d failed to register\n",
1392 event->type);
1393 WARN_ON_ONCE(1);
1394 }
1395 }
1396
1397 return 0;
1398}
1399early_initcall(init_events);