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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 + 1;
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
277int trace_raw_output_prep(struct trace_iterator *iter,
278 struct trace_event *trace_event)
279{
280 struct trace_event_call *event;
281 struct trace_seq *s = &iter->seq;
282 struct trace_seq *p = &iter->tmp_seq;
283 struct trace_entry *entry;
284
285 event = container_of(trace_event, struct trace_event_call, event);
286 entry = iter->ent;
287
288 if (entry->type != event->event.type) {
289 WARN_ON_ONCE(1);
290 return TRACE_TYPE_UNHANDLED;
291 }
292
293 trace_seq_init(p);
294 trace_seq_printf(s, "%s: ", trace_event_name(event));
295
296 return trace_handle_return(s);
297}
298EXPORT_SYMBOL(trace_raw_output_prep);
299
300static int trace_output_raw(struct trace_iterator *iter, char *name,
301 char *fmt, va_list ap)
302{
303 struct trace_seq *s = &iter->seq;
304
305 trace_seq_printf(s, "%s: ", name);
306 trace_seq_vprintf(s, fmt, ap);
307
308 return trace_handle_return(s);
309}
310
311int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
312{
313 va_list ap;
314 int ret;
315
316 va_start(ap, fmt);
317 ret = trace_output_raw(iter, name, fmt, ap);
318 va_end(ap);
319
320 return ret;
321}
322EXPORT_SYMBOL_GPL(trace_output_call);
323
324#ifdef CONFIG_KRETPROBES
325static inline const char *kretprobed(const char *name)
326{
327 static const char tramp_name[] = "kretprobe_trampoline";
328 int size = sizeof(tramp_name);
329
330 if (strncmp(tramp_name, name, size) == 0)
331 return "[unknown/kretprobe'd]";
332 return name;
333}
334#else
335static inline const char *kretprobed(const char *name)
336{
337 return name;
338}
339#endif /* CONFIG_KRETPROBES */
340
341static void
342seq_print_sym(struct trace_seq *s, unsigned long address, bool offset)
343{
344#ifdef CONFIG_KALLSYMS
345 char str[KSYM_SYMBOL_LEN];
346 const char *name;
347
348 if (offset)
349 sprint_symbol(str, address);
350 else
351 kallsyms_lookup(address, NULL, NULL, NULL, str);
352 name = kretprobed(str);
353
354 if (name && strlen(name)) {
355 trace_seq_puts(s, name);
356 return;
357 }
358#endif
359 trace_seq_printf(s, "0x%08lx", address);
360}
361
362#ifndef CONFIG_64BIT
363# define IP_FMT "%08lx"
364#else
365# define IP_FMT "%016lx"
366#endif
367
368static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
369 unsigned long ip, unsigned long sym_flags)
370{
371 struct file *file = NULL;
372 unsigned long vmstart = 0;
373 int ret = 1;
374
375 if (s->full)
376 return 0;
377
378 if (mm) {
379 const struct vm_area_struct *vma;
380
381 down_read(&mm->mmap_sem);
382 vma = find_vma(mm, ip);
383 if (vma) {
384 file = vma->vm_file;
385 vmstart = vma->vm_start;
386 }
387 if (file) {
388 ret = trace_seq_path(s, &file->f_path);
389 if (ret)
390 trace_seq_printf(s, "[+0x%lx]",
391 ip - vmstart);
392 }
393 up_read(&mm->mmap_sem);
394 }
395 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
396 trace_seq_printf(s, " <" IP_FMT ">", ip);
397 return !trace_seq_has_overflowed(s);
398}
399
400int
401seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
402{
403 if (!ip) {
404 trace_seq_putc(s, '0');
405 goto out;
406 }
407
408 seq_print_sym(s, ip, sym_flags & TRACE_ITER_SYM_OFFSET);
409
410 if (sym_flags & TRACE_ITER_SYM_ADDR)
411 trace_seq_printf(s, " <" IP_FMT ">", ip);
412
413 out:
414 return !trace_seq_has_overflowed(s);
415}
416
417/**
418 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
419 * @s: trace seq struct to write to
420 * @entry: The trace entry field from the ring buffer
421 *
422 * Prints the generic fields of irqs off, in hard or softirq, preempt
423 * count.
424 */
425int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
426{
427 char hardsoft_irq;
428 char need_resched;
429 char irqs_off;
430 int hardirq;
431 int softirq;
432 int nmi;
433
434 nmi = entry->flags & TRACE_FLAG_NMI;
435 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
436 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
437
438 irqs_off =
439 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
440 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
441 '.';
442
443 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
444 TRACE_FLAG_PREEMPT_RESCHED)) {
445 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
446 need_resched = 'N';
447 break;
448 case TRACE_FLAG_NEED_RESCHED:
449 need_resched = 'n';
450 break;
451 case TRACE_FLAG_PREEMPT_RESCHED:
452 need_resched = 'p';
453 break;
454 default:
455 need_resched = '.';
456 break;
457 }
458
459 hardsoft_irq =
460 (nmi && hardirq) ? 'Z' :
461 nmi ? 'z' :
462 (hardirq && softirq) ? 'H' :
463 hardirq ? 'h' :
464 softirq ? 's' :
465 '.' ;
466
467 trace_seq_printf(s, "%c%c%c",
468 irqs_off, need_resched, hardsoft_irq);
469
470 if (entry->preempt_count)
471 trace_seq_printf(s, "%x", entry->preempt_count);
472 else
473 trace_seq_putc(s, '.');
474
475 return !trace_seq_has_overflowed(s);
476}
477
478static int
479lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
480{
481 char comm[TASK_COMM_LEN];
482
483 trace_find_cmdline(entry->pid, comm);
484
485 trace_seq_printf(s, "%8.8s-%-5d %3d",
486 comm, entry->pid, cpu);
487
488 return trace_print_lat_fmt(s, entry);
489}
490
491#undef MARK
492#define MARK(v, s) {.val = v, .sym = s}
493/* trace overhead mark */
494static const struct trace_mark {
495 unsigned long long val; /* unit: nsec */
496 char sym;
497} mark[] = {
498 MARK(1000000000ULL , '$'), /* 1 sec */
499 MARK(100000000ULL , '@'), /* 100 msec */
500 MARK(10000000ULL , '*'), /* 10 msec */
501 MARK(1000000ULL , '#'), /* 1000 usecs */
502 MARK(100000ULL , '!'), /* 100 usecs */
503 MARK(10000ULL , '+'), /* 10 usecs */
504};
505#undef MARK
506
507char trace_find_mark(unsigned long long d)
508{
509 int i;
510 int size = ARRAY_SIZE(mark);
511
512 for (i = 0; i < size; i++) {
513 if (d > mark[i].val)
514 break;
515 }
516
517 return (i == size) ? ' ' : mark[i].sym;
518}
519
520static int
521lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
522{
523 struct trace_array *tr = iter->tr;
524 unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
525 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
526 unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start;
527 unsigned long long rel_ts = next_ts - iter->ts;
528 struct trace_seq *s = &iter->seq;
529
530 if (in_ns) {
531 abs_ts = ns2usecs(abs_ts);
532 rel_ts = ns2usecs(rel_ts);
533 }
534
535 if (verbose && in_ns) {
536 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
537 unsigned long abs_msec = (unsigned long)abs_ts;
538 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
539 unsigned long rel_msec = (unsigned long)rel_ts;
540
541 trace_seq_printf(
542 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
543 ns2usecs(iter->ts),
544 abs_msec, abs_usec,
545 rel_msec, rel_usec);
546
547 } else if (verbose && !in_ns) {
548 trace_seq_printf(
549 s, "[%016llx] %lld (+%lld): ",
550 iter->ts, abs_ts, rel_ts);
551
552 } else if (!verbose && in_ns) {
553 trace_seq_printf(
554 s, " %4lldus%c: ",
555 abs_ts,
556 trace_find_mark(rel_ts * NSEC_PER_USEC));
557
558 } else { /* !verbose && !in_ns */
559 trace_seq_printf(s, " %4lld: ", abs_ts);
560 }
561
562 return !trace_seq_has_overflowed(s);
563}
564
565int trace_print_context(struct trace_iterator *iter)
566{
567 struct trace_array *tr = iter->tr;
568 struct trace_seq *s = &iter->seq;
569 struct trace_entry *entry = iter->ent;
570 unsigned long long t;
571 unsigned long secs, usec_rem;
572 char comm[TASK_COMM_LEN];
573
574 trace_find_cmdline(entry->pid, comm);
575
576 trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid);
577
578 if (tr->trace_flags & TRACE_ITER_RECORD_TGID) {
579 unsigned int tgid = trace_find_tgid(entry->pid);
580
581 if (!tgid)
582 trace_seq_printf(s, "(-----) ");
583 else
584 trace_seq_printf(s, "(%5d) ", tgid);
585 }
586
587 trace_seq_printf(s, "[%03d] ", iter->cpu);
588
589 if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
590 trace_print_lat_fmt(s, entry);
591
592 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
593 t = ns2usecs(iter->ts);
594 usec_rem = do_div(t, USEC_PER_SEC);
595 secs = (unsigned long)t;
596 trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
597 } else
598 trace_seq_printf(s, " %12llu: ", iter->ts);
599
600 return !trace_seq_has_overflowed(s);
601}
602
603int trace_print_lat_context(struct trace_iterator *iter)
604{
605 struct trace_array *tr = iter->tr;
606 /* trace_find_next_entry will reset ent_size */
607 int ent_size = iter->ent_size;
608 struct trace_seq *s = &iter->seq;
609 u64 next_ts;
610 struct trace_entry *entry = iter->ent,
611 *next_entry = trace_find_next_entry(iter, NULL,
612 &next_ts);
613 unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
614
615 /* Restore the original ent_size */
616 iter->ent_size = ent_size;
617
618 if (!next_entry)
619 next_ts = iter->ts;
620
621 if (verbose) {
622 char comm[TASK_COMM_LEN];
623
624 trace_find_cmdline(entry->pid, comm);
625
626 trace_seq_printf(
627 s, "%16s %5d %3d %d %08x %08lx ",
628 comm, entry->pid, iter->cpu, entry->flags,
629 entry->preempt_count, iter->idx);
630 } else {
631 lat_print_generic(s, entry, iter->cpu);
632 }
633
634 lat_print_timestamp(iter, next_ts);
635
636 return !trace_seq_has_overflowed(s);
637}
638
639/**
640 * ftrace_find_event - find a registered event
641 * @type: the type of event to look for
642 *
643 * Returns an event of type @type otherwise NULL
644 * Called with trace_event_read_lock() held.
645 */
646struct trace_event *ftrace_find_event(int type)
647{
648 struct trace_event *event;
649 unsigned key;
650
651 key = type & (EVENT_HASHSIZE - 1);
652
653 hlist_for_each_entry(event, &event_hash[key], node) {
654 if (event->type == type)
655 return event;
656 }
657
658 return NULL;
659}
660
661static LIST_HEAD(ftrace_event_list);
662
663static int trace_search_list(struct list_head **list)
664{
665 struct trace_event *e;
666 int last = __TRACE_LAST_TYPE;
667
668 if (list_empty(&ftrace_event_list)) {
669 *list = &ftrace_event_list;
670 return last + 1;
671 }
672
673 /*
674 * We used up all possible max events,
675 * lets see if somebody freed one.
676 */
677 list_for_each_entry(e, &ftrace_event_list, list) {
678 if (e->type != last + 1)
679 break;
680 last++;
681 }
682
683 /* Did we used up all 65 thousand events??? */
684 if ((last + 1) > TRACE_EVENT_TYPE_MAX)
685 return 0;
686
687 *list = &e->list;
688 return last + 1;
689}
690
691void trace_event_read_lock(void)
692{
693 down_read(&trace_event_sem);
694}
695
696void trace_event_read_unlock(void)
697{
698 up_read(&trace_event_sem);
699}
700
701/**
702 * register_trace_event - register output for an event type
703 * @event: the event type to register
704 *
705 * Event types are stored in a hash and this hash is used to
706 * find a way to print an event. If the @event->type is set
707 * then it will use that type, otherwise it will assign a
708 * type to use.
709 *
710 * If you assign your own type, please make sure it is added
711 * to the trace_type enum in trace.h, to avoid collisions
712 * with the dynamic types.
713 *
714 * Returns the event type number or zero on error.
715 */
716int register_trace_event(struct trace_event *event)
717{
718 unsigned key;
719 int ret = 0;
720
721 down_write(&trace_event_sem);
722
723 if (WARN_ON(!event))
724 goto out;
725
726 if (WARN_ON(!event->funcs))
727 goto out;
728
729 INIT_LIST_HEAD(&event->list);
730
731 if (!event->type) {
732 struct list_head *list = NULL;
733
734 if (next_event_type > TRACE_EVENT_TYPE_MAX) {
735
736 event->type = trace_search_list(&list);
737 if (!event->type)
738 goto out;
739
740 } else {
741
742 event->type = next_event_type++;
743 list = &ftrace_event_list;
744 }
745
746 if (WARN_ON(ftrace_find_event(event->type)))
747 goto out;
748
749 list_add_tail(&event->list, list);
750
751 } else if (event->type > __TRACE_LAST_TYPE) {
752 printk(KERN_WARNING "Need to add type to trace.h\n");
753 WARN_ON(1);
754 goto out;
755 } else {
756 /* Is this event already used */
757 if (ftrace_find_event(event->type))
758 goto out;
759 }
760
761 if (event->funcs->trace == NULL)
762 event->funcs->trace = trace_nop_print;
763 if (event->funcs->raw == NULL)
764 event->funcs->raw = trace_nop_print;
765 if (event->funcs->hex == NULL)
766 event->funcs->hex = trace_nop_print;
767 if (event->funcs->binary == NULL)
768 event->funcs->binary = trace_nop_print;
769
770 key = event->type & (EVENT_HASHSIZE - 1);
771
772 hlist_add_head(&event->node, &event_hash[key]);
773
774 ret = event->type;
775 out:
776 up_write(&trace_event_sem);
777
778 return ret;
779}
780EXPORT_SYMBOL_GPL(register_trace_event);
781
782/*
783 * Used by module code with the trace_event_sem held for write.
784 */
785int __unregister_trace_event(struct trace_event *event)
786{
787 hlist_del(&event->node);
788 list_del(&event->list);
789 return 0;
790}
791
792/**
793 * unregister_trace_event - remove a no longer used event
794 * @event: the event to remove
795 */
796int unregister_trace_event(struct trace_event *event)
797{
798 down_write(&trace_event_sem);
799 __unregister_trace_event(event);
800 up_write(&trace_event_sem);
801
802 return 0;
803}
804EXPORT_SYMBOL_GPL(unregister_trace_event);
805
806/*
807 * Standard events
808 */
809
810enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
811 struct trace_event *event)
812{
813 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
814
815 return trace_handle_return(&iter->seq);
816}
817
818/* TRACE_FN */
819static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
820 struct trace_event *event)
821{
822 struct ftrace_entry *field;
823 struct trace_seq *s = &iter->seq;
824
825 trace_assign_type(field, iter->ent);
826
827 seq_print_ip_sym(s, field->ip, flags);
828
829 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
830 trace_seq_puts(s, " <-");
831 seq_print_ip_sym(s, field->parent_ip, flags);
832 }
833
834 trace_seq_putc(s, '\n');
835
836 return trace_handle_return(s);
837}
838
839static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
840 struct trace_event *event)
841{
842 struct ftrace_entry *field;
843
844 trace_assign_type(field, iter->ent);
845
846 trace_seq_printf(&iter->seq, "%lx %lx\n",
847 field->ip,
848 field->parent_ip);
849
850 return trace_handle_return(&iter->seq);
851}
852
853static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
854 struct trace_event *event)
855{
856 struct ftrace_entry *field;
857 struct trace_seq *s = &iter->seq;
858
859 trace_assign_type(field, iter->ent);
860
861 SEQ_PUT_HEX_FIELD(s, field->ip);
862 SEQ_PUT_HEX_FIELD(s, field->parent_ip);
863
864 return trace_handle_return(s);
865}
866
867static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
868 struct trace_event *event)
869{
870 struct ftrace_entry *field;
871 struct trace_seq *s = &iter->seq;
872
873 trace_assign_type(field, iter->ent);
874
875 SEQ_PUT_FIELD(s, field->ip);
876 SEQ_PUT_FIELD(s, field->parent_ip);
877
878 return trace_handle_return(s);
879}
880
881static struct trace_event_functions trace_fn_funcs = {
882 .trace = trace_fn_trace,
883 .raw = trace_fn_raw,
884 .hex = trace_fn_hex,
885 .binary = trace_fn_bin,
886};
887
888static struct trace_event trace_fn_event = {
889 .type = TRACE_FN,
890 .funcs = &trace_fn_funcs,
891};
892
893/* TRACE_CTX an TRACE_WAKE */
894static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
895 char *delim)
896{
897 struct ctx_switch_entry *field;
898 char comm[TASK_COMM_LEN];
899 int S, T;
900
901
902 trace_assign_type(field, iter->ent);
903
904 T = task_index_to_char(field->next_state);
905 S = task_index_to_char(field->prev_state);
906 trace_find_cmdline(field->next_pid, comm);
907 trace_seq_printf(&iter->seq,
908 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
909 field->prev_pid,
910 field->prev_prio,
911 S, delim,
912 field->next_cpu,
913 field->next_pid,
914 field->next_prio,
915 T, comm);
916
917 return trace_handle_return(&iter->seq);
918}
919
920static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
921 struct trace_event *event)
922{
923 return trace_ctxwake_print(iter, "==>");
924}
925
926static enum print_line_t trace_wake_print(struct trace_iterator *iter,
927 int flags, struct trace_event *event)
928{
929 return trace_ctxwake_print(iter, " +");
930}
931
932static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
933{
934 struct ctx_switch_entry *field;
935 int T;
936
937 trace_assign_type(field, iter->ent);
938
939 if (!S)
940 S = task_index_to_char(field->prev_state);
941 T = task_index_to_char(field->next_state);
942 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
943 field->prev_pid,
944 field->prev_prio,
945 S,
946 field->next_cpu,
947 field->next_pid,
948 field->next_prio,
949 T);
950
951 return trace_handle_return(&iter->seq);
952}
953
954static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
955 struct trace_event *event)
956{
957 return trace_ctxwake_raw(iter, 0);
958}
959
960static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
961 struct trace_event *event)
962{
963 return trace_ctxwake_raw(iter, '+');
964}
965
966
967static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
968{
969 struct ctx_switch_entry *field;
970 struct trace_seq *s = &iter->seq;
971 int T;
972
973 trace_assign_type(field, iter->ent);
974
975 if (!S)
976 S = task_index_to_char(field->prev_state);
977 T = task_index_to_char(field->next_state);
978
979 SEQ_PUT_HEX_FIELD(s, field->prev_pid);
980 SEQ_PUT_HEX_FIELD(s, field->prev_prio);
981 SEQ_PUT_HEX_FIELD(s, S);
982 SEQ_PUT_HEX_FIELD(s, field->next_cpu);
983 SEQ_PUT_HEX_FIELD(s, field->next_pid);
984 SEQ_PUT_HEX_FIELD(s, field->next_prio);
985 SEQ_PUT_HEX_FIELD(s, T);
986
987 return trace_handle_return(s);
988}
989
990static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
991 struct trace_event *event)
992{
993 return trace_ctxwake_hex(iter, 0);
994}
995
996static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
997 struct trace_event *event)
998{
999 return trace_ctxwake_hex(iter, '+');
1000}
1001
1002static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1003 int flags, struct trace_event *event)
1004{
1005 struct ctx_switch_entry *field;
1006 struct trace_seq *s = &iter->seq;
1007
1008 trace_assign_type(field, iter->ent);
1009
1010 SEQ_PUT_FIELD(s, field->prev_pid);
1011 SEQ_PUT_FIELD(s, field->prev_prio);
1012 SEQ_PUT_FIELD(s, field->prev_state);
1013 SEQ_PUT_FIELD(s, field->next_cpu);
1014 SEQ_PUT_FIELD(s, field->next_pid);
1015 SEQ_PUT_FIELD(s, field->next_prio);
1016 SEQ_PUT_FIELD(s, field->next_state);
1017
1018 return trace_handle_return(s);
1019}
1020
1021static struct trace_event_functions trace_ctx_funcs = {
1022 .trace = trace_ctx_print,
1023 .raw = trace_ctx_raw,
1024 .hex = trace_ctx_hex,
1025 .binary = trace_ctxwake_bin,
1026};
1027
1028static struct trace_event trace_ctx_event = {
1029 .type = TRACE_CTX,
1030 .funcs = &trace_ctx_funcs,
1031};
1032
1033static struct trace_event_functions trace_wake_funcs = {
1034 .trace = trace_wake_print,
1035 .raw = trace_wake_raw,
1036 .hex = trace_wake_hex,
1037 .binary = trace_ctxwake_bin,
1038};
1039
1040static struct trace_event trace_wake_event = {
1041 .type = TRACE_WAKE,
1042 .funcs = &trace_wake_funcs,
1043};
1044
1045/* TRACE_STACK */
1046
1047static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1048 int flags, struct trace_event *event)
1049{
1050 struct stack_entry *field;
1051 struct trace_seq *s = &iter->seq;
1052 unsigned long *p;
1053 unsigned long *end;
1054
1055 trace_assign_type(field, iter->ent);
1056 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1057
1058 trace_seq_puts(s, "<stack trace>\n");
1059
1060 for (p = field->caller; p && p < end && *p != ULONG_MAX; p++) {
1061
1062 if (trace_seq_has_overflowed(s))
1063 break;
1064
1065 trace_seq_puts(s, " => ");
1066 seq_print_ip_sym(s, *p, flags);
1067 trace_seq_putc(s, '\n');
1068 }
1069
1070 return trace_handle_return(s);
1071}
1072
1073static struct trace_event_functions trace_stack_funcs = {
1074 .trace = trace_stack_print,
1075};
1076
1077static struct trace_event trace_stack_event = {
1078 .type = TRACE_STACK,
1079 .funcs = &trace_stack_funcs,
1080};
1081
1082/* TRACE_USER_STACK */
1083static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1084 int flags, struct trace_event *event)
1085{
1086 struct trace_array *tr = iter->tr;
1087 struct userstack_entry *field;
1088 struct trace_seq *s = &iter->seq;
1089 struct mm_struct *mm = NULL;
1090 unsigned int i;
1091
1092 trace_assign_type(field, iter->ent);
1093
1094 trace_seq_puts(s, "<user stack trace>\n");
1095
1096 if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
1097 struct task_struct *task;
1098 /*
1099 * we do the lookup on the thread group leader,
1100 * since individual threads might have already quit!
1101 */
1102 rcu_read_lock();
1103 task = find_task_by_vpid(field->tgid);
1104 if (task)
1105 mm = get_task_mm(task);
1106 rcu_read_unlock();
1107 }
1108
1109 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1110 unsigned long ip = field->caller[i];
1111
1112 if (!ip || trace_seq_has_overflowed(s))
1113 break;
1114
1115 trace_seq_puts(s, " => ");
1116 seq_print_user_ip(s, mm, ip, flags);
1117 trace_seq_putc(s, '\n');
1118 }
1119
1120 if (mm)
1121 mmput(mm);
1122
1123 return trace_handle_return(s);
1124}
1125
1126static struct trace_event_functions trace_user_stack_funcs = {
1127 .trace = trace_user_stack_print,
1128};
1129
1130static struct trace_event trace_user_stack_event = {
1131 .type = TRACE_USER_STACK,
1132 .funcs = &trace_user_stack_funcs,
1133};
1134
1135/* TRACE_HWLAT */
1136static enum print_line_t
1137trace_hwlat_print(struct trace_iterator *iter, int flags,
1138 struct trace_event *event)
1139{
1140 struct trace_entry *entry = iter->ent;
1141 struct trace_seq *s = &iter->seq;
1142 struct hwlat_entry *field;
1143
1144 trace_assign_type(field, entry);
1145
1146 trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld",
1147 field->seqnum,
1148 field->duration,
1149 field->outer_duration,
1150 (long long)field->timestamp.tv_sec,
1151 field->timestamp.tv_nsec);
1152
1153 if (field->nmi_count) {
1154 /*
1155 * The generic sched_clock() is not NMI safe, thus
1156 * we only record the count and not the time.
1157 */
1158 if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK))
1159 trace_seq_printf(s, " nmi-total:%llu",
1160 field->nmi_total_ts);
1161 trace_seq_printf(s, " nmi-count:%u",
1162 field->nmi_count);
1163 }
1164
1165 trace_seq_putc(s, '\n');
1166
1167 return trace_handle_return(s);
1168}
1169
1170
1171static enum print_line_t
1172trace_hwlat_raw(struct trace_iterator *iter, int flags,
1173 struct trace_event *event)
1174{
1175 struct hwlat_entry *field;
1176 struct trace_seq *s = &iter->seq;
1177
1178 trace_assign_type(field, iter->ent);
1179
1180 trace_seq_printf(s, "%llu %lld %lld %09ld %u\n",
1181 field->duration,
1182 field->outer_duration,
1183 (long long)field->timestamp.tv_sec,
1184 field->timestamp.tv_nsec,
1185 field->seqnum);
1186
1187 return trace_handle_return(s);
1188}
1189
1190static struct trace_event_functions trace_hwlat_funcs = {
1191 .trace = trace_hwlat_print,
1192 .raw = trace_hwlat_raw,
1193};
1194
1195static struct trace_event trace_hwlat_event = {
1196 .type = TRACE_HWLAT,
1197 .funcs = &trace_hwlat_funcs,
1198};
1199
1200/* TRACE_BPUTS */
1201static enum print_line_t
1202trace_bputs_print(struct trace_iterator *iter, int flags,
1203 struct trace_event *event)
1204{
1205 struct trace_entry *entry = iter->ent;
1206 struct trace_seq *s = &iter->seq;
1207 struct bputs_entry *field;
1208
1209 trace_assign_type(field, entry);
1210
1211 seq_print_ip_sym(s, field->ip, flags);
1212 trace_seq_puts(s, ": ");
1213 trace_seq_puts(s, field->str);
1214
1215 return trace_handle_return(s);
1216}
1217
1218
1219static enum print_line_t
1220trace_bputs_raw(struct trace_iterator *iter, int flags,
1221 struct trace_event *event)
1222{
1223 struct bputs_entry *field;
1224 struct trace_seq *s = &iter->seq;
1225
1226 trace_assign_type(field, iter->ent);
1227
1228 trace_seq_printf(s, ": %lx : ", field->ip);
1229 trace_seq_puts(s, field->str);
1230
1231 return trace_handle_return(s);
1232}
1233
1234static struct trace_event_functions trace_bputs_funcs = {
1235 .trace = trace_bputs_print,
1236 .raw = trace_bputs_raw,
1237};
1238
1239static struct trace_event trace_bputs_event = {
1240 .type = TRACE_BPUTS,
1241 .funcs = &trace_bputs_funcs,
1242};
1243
1244/* TRACE_BPRINT */
1245static enum print_line_t
1246trace_bprint_print(struct trace_iterator *iter, int flags,
1247 struct trace_event *event)
1248{
1249 struct trace_entry *entry = iter->ent;
1250 struct trace_seq *s = &iter->seq;
1251 struct bprint_entry *field;
1252
1253 trace_assign_type(field, entry);
1254
1255 seq_print_ip_sym(s, field->ip, flags);
1256 trace_seq_puts(s, ": ");
1257 trace_seq_bprintf(s, field->fmt, field->buf);
1258
1259 return trace_handle_return(s);
1260}
1261
1262
1263static enum print_line_t
1264trace_bprint_raw(struct trace_iterator *iter, int flags,
1265 struct trace_event *event)
1266{
1267 struct bprint_entry *field;
1268 struct trace_seq *s = &iter->seq;
1269
1270 trace_assign_type(field, iter->ent);
1271
1272 trace_seq_printf(s, ": %lx : ", field->ip);
1273 trace_seq_bprintf(s, field->fmt, field->buf);
1274
1275 return trace_handle_return(s);
1276}
1277
1278static struct trace_event_functions trace_bprint_funcs = {
1279 .trace = trace_bprint_print,
1280 .raw = trace_bprint_raw,
1281};
1282
1283static struct trace_event trace_bprint_event = {
1284 .type = TRACE_BPRINT,
1285 .funcs = &trace_bprint_funcs,
1286};
1287
1288/* TRACE_PRINT */
1289static enum print_line_t trace_print_print(struct trace_iterator *iter,
1290 int flags, struct trace_event *event)
1291{
1292 struct print_entry *field;
1293 struct trace_seq *s = &iter->seq;
1294
1295 trace_assign_type(field, iter->ent);
1296
1297 seq_print_ip_sym(s, field->ip, flags);
1298 trace_seq_printf(s, ": %s", field->buf);
1299
1300 return trace_handle_return(s);
1301}
1302
1303static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1304 struct trace_event *event)
1305{
1306 struct print_entry *field;
1307
1308 trace_assign_type(field, iter->ent);
1309
1310 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1311
1312 return trace_handle_return(&iter->seq);
1313}
1314
1315static struct trace_event_functions trace_print_funcs = {
1316 .trace = trace_print_print,
1317 .raw = trace_print_raw,
1318};
1319
1320static struct trace_event trace_print_event = {
1321 .type = TRACE_PRINT,
1322 .funcs = &trace_print_funcs,
1323};
1324
1325static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags,
1326 struct trace_event *event)
1327{
1328 struct raw_data_entry *field;
1329 int i;
1330
1331 trace_assign_type(field, iter->ent);
1332
1333 trace_seq_printf(&iter->seq, "# %x buf:", field->id);
1334
1335 for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++)
1336 trace_seq_printf(&iter->seq, " %02x",
1337 (unsigned char)field->buf[i]);
1338
1339 trace_seq_putc(&iter->seq, '\n');
1340
1341 return trace_handle_return(&iter->seq);
1342}
1343
1344static struct trace_event_functions trace_raw_data_funcs = {
1345 .trace = trace_raw_data,
1346 .raw = trace_raw_data,
1347};
1348
1349static struct trace_event trace_raw_data_event = {
1350 .type = TRACE_RAW_DATA,
1351 .funcs = &trace_raw_data_funcs,
1352};
1353
1354
1355static struct trace_event *events[] __initdata = {
1356 &trace_fn_event,
1357 &trace_ctx_event,
1358 &trace_wake_event,
1359 &trace_stack_event,
1360 &trace_user_stack_event,
1361 &trace_bputs_event,
1362 &trace_bprint_event,
1363 &trace_print_event,
1364 &trace_hwlat_event,
1365 &trace_raw_data_event,
1366 NULL
1367};
1368
1369__init static int init_events(void)
1370{
1371 struct trace_event *event;
1372 int i, ret;
1373
1374 for (i = 0; events[i]; i++) {
1375 event = events[i];
1376
1377 ret = register_trace_event(event);
1378 if (!ret) {
1379 printk(KERN_WARNING "event %d failed to register\n",
1380 event->type);
1381 WARN_ON_ONCE(1);
1382 }
1383 }
1384
1385 return 0;
1386}
1387early_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_mutex);
18
19static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
20
21static int next_event_type = __TRACE_LAST_TYPE + 1;
22
23int trace_print_seq(struct seq_file *m, struct trace_seq *s)
24{
25 int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;
26 int ret;
27
28 ret = seq_write(m, s->buffer, len);
29
30 /*
31 * Only reset this buffer if we successfully wrote to the
32 * seq_file buffer.
33 */
34 if (!ret)
35 trace_seq_init(s);
36
37 return ret;
38}
39
40enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
41{
42 struct trace_seq *s = &iter->seq;
43 struct trace_entry *entry = iter->ent;
44 struct bprint_entry *field;
45 int ret;
46
47 trace_assign_type(field, entry);
48
49 ret = trace_seq_bprintf(s, field->fmt, field->buf);
50 if (!ret)
51 return TRACE_TYPE_PARTIAL_LINE;
52
53 return TRACE_TYPE_HANDLED;
54}
55
56enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
57{
58 struct trace_seq *s = &iter->seq;
59 struct trace_entry *entry = iter->ent;
60 struct print_entry *field;
61 int ret;
62
63 trace_assign_type(field, entry);
64
65 ret = trace_seq_printf(s, "%s", field->buf);
66 if (!ret)
67 return TRACE_TYPE_PARTIAL_LINE;
68
69 return TRACE_TYPE_HANDLED;
70}
71
72/**
73 * trace_seq_printf - sequence printing of trace information
74 * @s: trace sequence descriptor
75 * @fmt: printf format string
76 *
77 * It returns 0 if the trace oversizes the buffer's free
78 * space, 1 otherwise.
79 *
80 * The tracer may use either sequence operations or its own
81 * copy to user routines. To simplify formating of a trace
82 * trace_seq_printf is used to store strings into a special
83 * buffer (@s). Then the output may be either used by
84 * the sequencer or pulled into another buffer.
85 */
86int
87trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
88{
89 int len = (PAGE_SIZE - 1) - s->len;
90 va_list ap;
91 int ret;
92
93 if (s->full || !len)
94 return 0;
95
96 va_start(ap, fmt);
97 ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
98 va_end(ap);
99
100 /* If we can't write it all, don't bother writing anything */
101 if (ret >= len) {
102 s->full = 1;
103 return 0;
104 }
105
106 s->len += ret;
107
108 return 1;
109}
110EXPORT_SYMBOL_GPL(trace_seq_printf);
111
112/**
113 * trace_seq_vprintf - sequence printing of trace information
114 * @s: trace sequence descriptor
115 * @fmt: printf format string
116 *
117 * The tracer may use either sequence operations or its own
118 * copy to user routines. To simplify formating of a trace
119 * trace_seq_printf is used to store strings into a special
120 * buffer (@s). Then the output may be either used by
121 * the sequencer or pulled into another buffer.
122 */
123int
124trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
125{
126 int len = (PAGE_SIZE - 1) - s->len;
127 int ret;
128
129 if (s->full || !len)
130 return 0;
131
132 ret = vsnprintf(s->buffer + s->len, len, fmt, args);
133
134 /* If we can't write it all, don't bother writing anything */
135 if (ret >= len) {
136 s->full = 1;
137 return 0;
138 }
139
140 s->len += ret;
141
142 return len;
143}
144EXPORT_SYMBOL_GPL(trace_seq_vprintf);
145
146int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
147{
148 int len = (PAGE_SIZE - 1) - s->len;
149 int ret;
150
151 if (s->full || !len)
152 return 0;
153
154 ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
155
156 /* If we can't write it all, don't bother writing anything */
157 if (ret >= len) {
158 s->full = 1;
159 return 0;
160 }
161
162 s->len += ret;
163
164 return len;
165}
166
167/**
168 * trace_seq_puts - trace sequence printing of simple string
169 * @s: trace sequence descriptor
170 * @str: simple string to record
171 *
172 * The tracer may use either the sequence operations or its own
173 * copy to user routines. This function records a simple string
174 * into a special buffer (@s) for later retrieval by a sequencer
175 * or other mechanism.
176 */
177int trace_seq_puts(struct trace_seq *s, const char *str)
178{
179 int len = strlen(str);
180
181 if (s->full)
182 return 0;
183
184 if (len > ((PAGE_SIZE - 1) - s->len)) {
185 s->full = 1;
186 return 0;
187 }
188
189 memcpy(s->buffer + s->len, str, len);
190 s->len += len;
191
192 return len;
193}
194
195int trace_seq_putc(struct trace_seq *s, unsigned char c)
196{
197 if (s->full)
198 return 0;
199
200 if (s->len >= (PAGE_SIZE - 1)) {
201 s->full = 1;
202 return 0;
203 }
204
205 s->buffer[s->len++] = c;
206
207 return 1;
208}
209EXPORT_SYMBOL(trace_seq_putc);
210
211int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
212{
213 if (s->full)
214 return 0;
215
216 if (len > ((PAGE_SIZE - 1) - s->len)) {
217 s->full = 1;
218 return 0;
219 }
220
221 memcpy(s->buffer + s->len, mem, len);
222 s->len += len;
223
224 return len;
225}
226
227int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
228{
229 unsigned char hex[HEX_CHARS];
230 const unsigned char *data = mem;
231 int i, j;
232
233 if (s->full)
234 return 0;
235
236#ifdef __BIG_ENDIAN
237 for (i = 0, j = 0; i < len; i++) {
238#else
239 for (i = len-1, j = 0; i >= 0; i--) {
240#endif
241 hex[j++] = hex_asc_hi(data[i]);
242 hex[j++] = hex_asc_lo(data[i]);
243 }
244 hex[j++] = ' ';
245
246 return trace_seq_putmem(s, hex, j);
247}
248
249void *trace_seq_reserve(struct trace_seq *s, size_t len)
250{
251 void *ret;
252
253 if (s->full)
254 return NULL;
255
256 if (len > ((PAGE_SIZE - 1) - s->len)) {
257 s->full = 1;
258 return NULL;
259 }
260
261 ret = s->buffer + s->len;
262 s->len += len;
263
264 return ret;
265}
266
267int trace_seq_path(struct trace_seq *s, struct path *path)
268{
269 unsigned char *p;
270
271 if (s->full)
272 return 0;
273
274 if (s->len >= (PAGE_SIZE - 1)) {
275 s->full = 1;
276 return 0;
277 }
278
279 p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
280 if (!IS_ERR(p)) {
281 p = mangle_path(s->buffer + s->len, p, "\n");
282 if (p) {
283 s->len = p - s->buffer;
284 return 1;
285 }
286 } else {
287 s->buffer[s->len++] = '?';
288 return 1;
289 }
290
291 s->full = 1;
292 return 0;
293}
294
295const char *
296ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
297 unsigned long flags,
298 const struct trace_print_flags *flag_array)
299{
300 unsigned long mask;
301 const char *str;
302 const char *ret = p->buffer + p->len;
303 int i;
304
305 for (i = 0; flag_array[i].name && flags; i++) {
306
307 mask = flag_array[i].mask;
308 if ((flags & mask) != mask)
309 continue;
310
311 str = flag_array[i].name;
312 flags &= ~mask;
313 if (p->len && delim)
314 trace_seq_puts(p, delim);
315 trace_seq_puts(p, str);
316 }
317
318 /* check for left over flags */
319 if (flags) {
320 if (p->len && delim)
321 trace_seq_puts(p, delim);
322 trace_seq_printf(p, "0x%lx", flags);
323 }
324
325 trace_seq_putc(p, 0);
326
327 return ret;
328}
329EXPORT_SYMBOL(ftrace_print_flags_seq);
330
331const char *
332ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
333 const struct trace_print_flags *symbol_array)
334{
335 int i;
336 const char *ret = p->buffer + p->len;
337
338 for (i = 0; symbol_array[i].name; i++) {
339
340 if (val != symbol_array[i].mask)
341 continue;
342
343 trace_seq_puts(p, symbol_array[i].name);
344 break;
345 }
346
347 if (!p->len)
348 trace_seq_printf(p, "0x%lx", val);
349
350 trace_seq_putc(p, 0);
351
352 return ret;
353}
354EXPORT_SYMBOL(ftrace_print_symbols_seq);
355
356#if BITS_PER_LONG == 32
357const char *
358ftrace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
359 const struct trace_print_flags_u64 *symbol_array)
360{
361 int i;
362 const char *ret = p->buffer + p->len;
363
364 for (i = 0; symbol_array[i].name; i++) {
365
366 if (val != symbol_array[i].mask)
367 continue;
368
369 trace_seq_puts(p, symbol_array[i].name);
370 break;
371 }
372
373 if (!p->len)
374 trace_seq_printf(p, "0x%llx", val);
375
376 trace_seq_putc(p, 0);
377
378 return ret;
379}
380EXPORT_SYMBOL(ftrace_print_symbols_seq_u64);
381#endif
382
383const char *
384ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
385{
386 int i;
387 const char *ret = p->buffer + p->len;
388
389 for (i = 0; i < buf_len; i++)
390 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
391
392 trace_seq_putc(p, 0);
393
394 return ret;
395}
396EXPORT_SYMBOL(ftrace_print_hex_seq);
397
398#ifdef CONFIG_KRETPROBES
399static inline const char *kretprobed(const char *name)
400{
401 static const char tramp_name[] = "kretprobe_trampoline";
402 int size = sizeof(tramp_name);
403
404 if (strncmp(tramp_name, name, size) == 0)
405 return "[unknown/kretprobe'd]";
406 return name;
407}
408#else
409static inline const char *kretprobed(const char *name)
410{
411 return name;
412}
413#endif /* CONFIG_KRETPROBES */
414
415static int
416seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
417{
418#ifdef CONFIG_KALLSYMS
419 char str[KSYM_SYMBOL_LEN];
420 const char *name;
421
422 kallsyms_lookup(address, NULL, NULL, NULL, str);
423
424 name = kretprobed(str);
425
426 return trace_seq_printf(s, fmt, name);
427#endif
428 return 1;
429}
430
431static int
432seq_print_sym_offset(struct trace_seq *s, const char *fmt,
433 unsigned long address)
434{
435#ifdef CONFIG_KALLSYMS
436 char str[KSYM_SYMBOL_LEN];
437 const char *name;
438
439 sprint_symbol(str, address);
440 name = kretprobed(str);
441
442 return trace_seq_printf(s, fmt, name);
443#endif
444 return 1;
445}
446
447#ifndef CONFIG_64BIT
448# define IP_FMT "%08lx"
449#else
450# define IP_FMT "%016lx"
451#endif
452
453int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
454 unsigned long ip, unsigned long sym_flags)
455{
456 struct file *file = NULL;
457 unsigned long vmstart = 0;
458 int ret = 1;
459
460 if (s->full)
461 return 0;
462
463 if (mm) {
464 const struct vm_area_struct *vma;
465
466 down_read(&mm->mmap_sem);
467 vma = find_vma(mm, ip);
468 if (vma) {
469 file = vma->vm_file;
470 vmstart = vma->vm_start;
471 }
472 if (file) {
473 ret = trace_seq_path(s, &file->f_path);
474 if (ret)
475 ret = trace_seq_printf(s, "[+0x%lx]",
476 ip - vmstart);
477 }
478 up_read(&mm->mmap_sem);
479 }
480 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
481 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
482 return ret;
483}
484
485int
486seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
487 unsigned long sym_flags)
488{
489 struct mm_struct *mm = NULL;
490 int ret = 1;
491 unsigned int i;
492
493 if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
494 struct task_struct *task;
495 /*
496 * we do the lookup on the thread group leader,
497 * since individual threads might have already quit!
498 */
499 rcu_read_lock();
500 task = find_task_by_vpid(entry->tgid);
501 if (task)
502 mm = get_task_mm(task);
503 rcu_read_unlock();
504 }
505
506 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
507 unsigned long ip = entry->caller[i];
508
509 if (ip == ULONG_MAX || !ret)
510 break;
511 if (ret)
512 ret = trace_seq_puts(s, " => ");
513 if (!ip) {
514 if (ret)
515 ret = trace_seq_puts(s, "??");
516 if (ret)
517 ret = trace_seq_puts(s, "\n");
518 continue;
519 }
520 if (!ret)
521 break;
522 if (ret)
523 ret = seq_print_user_ip(s, mm, ip, sym_flags);
524 ret = trace_seq_puts(s, "\n");
525 }
526
527 if (mm)
528 mmput(mm);
529 return ret;
530}
531
532int
533seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
534{
535 int ret;
536
537 if (!ip)
538 return trace_seq_printf(s, "0");
539
540 if (sym_flags & TRACE_ITER_SYM_OFFSET)
541 ret = seq_print_sym_offset(s, "%s", ip);
542 else
543 ret = seq_print_sym_short(s, "%s", ip);
544
545 if (!ret)
546 return 0;
547
548 if (sym_flags & TRACE_ITER_SYM_ADDR)
549 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
550 return ret;
551}
552
553/**
554 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
555 * @s: trace seq struct to write to
556 * @entry: The trace entry field from the ring buffer
557 *
558 * Prints the generic fields of irqs off, in hard or softirq, preempt
559 * count.
560 */
561int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
562{
563 char hardsoft_irq;
564 char need_resched;
565 char irqs_off;
566 int hardirq;
567 int softirq;
568 int ret;
569
570 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
571 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
572
573 irqs_off =
574 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
575 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
576 '.';
577 need_resched =
578 (entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.';
579 hardsoft_irq =
580 (hardirq && softirq) ? 'H' :
581 hardirq ? 'h' :
582 softirq ? 's' :
583 '.';
584
585 if (!trace_seq_printf(s, "%c%c%c",
586 irqs_off, need_resched, hardsoft_irq))
587 return 0;
588
589 if (entry->preempt_count)
590 ret = trace_seq_printf(s, "%x", entry->preempt_count);
591 else
592 ret = trace_seq_putc(s, '.');
593
594 return ret;
595}
596
597static int
598lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
599{
600 char comm[TASK_COMM_LEN];
601
602 trace_find_cmdline(entry->pid, comm);
603
604 if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
605 comm, entry->pid, cpu))
606 return 0;
607
608 return trace_print_lat_fmt(s, entry);
609}
610
611static unsigned long preempt_mark_thresh = 100;
612
613static int
614lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
615 unsigned long rel_usecs)
616{
617 return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
618 rel_usecs > preempt_mark_thresh ? '!' :
619 rel_usecs > 1 ? '+' : ' ');
620}
621
622int trace_print_context(struct trace_iterator *iter)
623{
624 struct trace_seq *s = &iter->seq;
625 struct trace_entry *entry = iter->ent;
626 unsigned long long t = ns2usecs(iter->ts);
627 unsigned long usec_rem = do_div(t, USEC_PER_SEC);
628 unsigned long secs = (unsigned long)t;
629 char comm[TASK_COMM_LEN];
630
631 trace_find_cmdline(entry->pid, comm);
632
633 return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
634 comm, entry->pid, iter->cpu, secs, usec_rem);
635}
636
637int trace_print_lat_context(struct trace_iterator *iter)
638{
639 u64 next_ts;
640 int ret;
641 struct trace_seq *s = &iter->seq;
642 struct trace_entry *entry = iter->ent,
643 *next_entry = trace_find_next_entry(iter, NULL,
644 &next_ts);
645 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
646 unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
647 unsigned long rel_usecs;
648
649 if (!next_entry)
650 next_ts = iter->ts;
651 rel_usecs = ns2usecs(next_ts - iter->ts);
652
653 if (verbose) {
654 char comm[TASK_COMM_LEN];
655
656 trace_find_cmdline(entry->pid, comm);
657
658 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
659 " %ld.%03ldms (+%ld.%03ldms): ", comm,
660 entry->pid, iter->cpu, entry->flags,
661 entry->preempt_count, iter->idx,
662 ns2usecs(iter->ts),
663 abs_usecs / USEC_PER_MSEC,
664 abs_usecs % USEC_PER_MSEC,
665 rel_usecs / USEC_PER_MSEC,
666 rel_usecs % USEC_PER_MSEC);
667 } else {
668 ret = lat_print_generic(s, entry, iter->cpu);
669 if (ret)
670 ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
671 }
672
673 return ret;
674}
675
676static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
677
678static int task_state_char(unsigned long state)
679{
680 int bit = state ? __ffs(state) + 1 : 0;
681
682 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
683}
684
685/**
686 * ftrace_find_event - find a registered event
687 * @type: the type of event to look for
688 *
689 * Returns an event of type @type otherwise NULL
690 * Called with trace_event_read_lock() held.
691 */
692struct trace_event *ftrace_find_event(int type)
693{
694 struct trace_event *event;
695 struct hlist_node *n;
696 unsigned key;
697
698 key = type & (EVENT_HASHSIZE - 1);
699
700 hlist_for_each_entry(event, n, &event_hash[key], node) {
701 if (event->type == type)
702 return event;
703 }
704
705 return NULL;
706}
707
708static LIST_HEAD(ftrace_event_list);
709
710static int trace_search_list(struct list_head **list)
711{
712 struct trace_event *e;
713 int last = __TRACE_LAST_TYPE;
714
715 if (list_empty(&ftrace_event_list)) {
716 *list = &ftrace_event_list;
717 return last + 1;
718 }
719
720 /*
721 * We used up all possible max events,
722 * lets see if somebody freed one.
723 */
724 list_for_each_entry(e, &ftrace_event_list, list) {
725 if (e->type != last + 1)
726 break;
727 last++;
728 }
729
730 /* Did we used up all 65 thousand events??? */
731 if ((last + 1) > FTRACE_MAX_EVENT)
732 return 0;
733
734 *list = &e->list;
735 return last + 1;
736}
737
738void trace_event_read_lock(void)
739{
740 down_read(&trace_event_mutex);
741}
742
743void trace_event_read_unlock(void)
744{
745 up_read(&trace_event_mutex);
746}
747
748/**
749 * register_ftrace_event - register output for an event type
750 * @event: the event type to register
751 *
752 * Event types are stored in a hash and this hash is used to
753 * find a way to print an event. If the @event->type is set
754 * then it will use that type, otherwise it will assign a
755 * type to use.
756 *
757 * If you assign your own type, please make sure it is added
758 * to the trace_type enum in trace.h, to avoid collisions
759 * with the dynamic types.
760 *
761 * Returns the event type number or zero on error.
762 */
763int register_ftrace_event(struct trace_event *event)
764{
765 unsigned key;
766 int ret = 0;
767
768 down_write(&trace_event_mutex);
769
770 if (WARN_ON(!event))
771 goto out;
772
773 if (WARN_ON(!event->funcs))
774 goto out;
775
776 INIT_LIST_HEAD(&event->list);
777
778 if (!event->type) {
779 struct list_head *list = NULL;
780
781 if (next_event_type > FTRACE_MAX_EVENT) {
782
783 event->type = trace_search_list(&list);
784 if (!event->type)
785 goto out;
786
787 } else {
788
789 event->type = next_event_type++;
790 list = &ftrace_event_list;
791 }
792
793 if (WARN_ON(ftrace_find_event(event->type)))
794 goto out;
795
796 list_add_tail(&event->list, list);
797
798 } else if (event->type > __TRACE_LAST_TYPE) {
799 printk(KERN_WARNING "Need to add type to trace.h\n");
800 WARN_ON(1);
801 goto out;
802 } else {
803 /* Is this event already used */
804 if (ftrace_find_event(event->type))
805 goto out;
806 }
807
808 if (event->funcs->trace == NULL)
809 event->funcs->trace = trace_nop_print;
810 if (event->funcs->raw == NULL)
811 event->funcs->raw = trace_nop_print;
812 if (event->funcs->hex == NULL)
813 event->funcs->hex = trace_nop_print;
814 if (event->funcs->binary == NULL)
815 event->funcs->binary = trace_nop_print;
816
817 key = event->type & (EVENT_HASHSIZE - 1);
818
819 hlist_add_head(&event->node, &event_hash[key]);
820
821 ret = event->type;
822 out:
823 up_write(&trace_event_mutex);
824
825 return ret;
826}
827EXPORT_SYMBOL_GPL(register_ftrace_event);
828
829/*
830 * Used by module code with the trace_event_mutex held for write.
831 */
832int __unregister_ftrace_event(struct trace_event *event)
833{
834 hlist_del(&event->node);
835 list_del(&event->list);
836 return 0;
837}
838
839/**
840 * unregister_ftrace_event - remove a no longer used event
841 * @event: the event to remove
842 */
843int unregister_ftrace_event(struct trace_event *event)
844{
845 down_write(&trace_event_mutex);
846 __unregister_ftrace_event(event);
847 up_write(&trace_event_mutex);
848
849 return 0;
850}
851EXPORT_SYMBOL_GPL(unregister_ftrace_event);
852
853/*
854 * Standard events
855 */
856
857enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
858 struct trace_event *event)
859{
860 if (!trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type))
861 return TRACE_TYPE_PARTIAL_LINE;
862
863 return TRACE_TYPE_HANDLED;
864}
865
866/* TRACE_FN */
867static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
868 struct trace_event *event)
869{
870 struct ftrace_entry *field;
871 struct trace_seq *s = &iter->seq;
872
873 trace_assign_type(field, iter->ent);
874
875 if (!seq_print_ip_sym(s, field->ip, flags))
876 goto partial;
877
878 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
879 if (!trace_seq_printf(s, " <-"))
880 goto partial;
881 if (!seq_print_ip_sym(s,
882 field->parent_ip,
883 flags))
884 goto partial;
885 }
886 if (!trace_seq_printf(s, "\n"))
887 goto partial;
888
889 return TRACE_TYPE_HANDLED;
890
891 partial:
892 return TRACE_TYPE_PARTIAL_LINE;
893}
894
895static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
896 struct trace_event *event)
897{
898 struct ftrace_entry *field;
899
900 trace_assign_type(field, iter->ent);
901
902 if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
903 field->ip,
904 field->parent_ip))
905 return TRACE_TYPE_PARTIAL_LINE;
906
907 return TRACE_TYPE_HANDLED;
908}
909
910static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
911 struct trace_event *event)
912{
913 struct ftrace_entry *field;
914 struct trace_seq *s = &iter->seq;
915
916 trace_assign_type(field, iter->ent);
917
918 SEQ_PUT_HEX_FIELD_RET(s, field->ip);
919 SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
920
921 return TRACE_TYPE_HANDLED;
922}
923
924static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
925 struct trace_event *event)
926{
927 struct ftrace_entry *field;
928 struct trace_seq *s = &iter->seq;
929
930 trace_assign_type(field, iter->ent);
931
932 SEQ_PUT_FIELD_RET(s, field->ip);
933 SEQ_PUT_FIELD_RET(s, field->parent_ip);
934
935 return TRACE_TYPE_HANDLED;
936}
937
938static struct trace_event_functions trace_fn_funcs = {
939 .trace = trace_fn_trace,
940 .raw = trace_fn_raw,
941 .hex = trace_fn_hex,
942 .binary = trace_fn_bin,
943};
944
945static struct trace_event trace_fn_event = {
946 .type = TRACE_FN,
947 .funcs = &trace_fn_funcs,
948};
949
950/* TRACE_CTX an TRACE_WAKE */
951static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
952 char *delim)
953{
954 struct ctx_switch_entry *field;
955 char comm[TASK_COMM_LEN];
956 int S, T;
957
958
959 trace_assign_type(field, iter->ent);
960
961 T = task_state_char(field->next_state);
962 S = task_state_char(field->prev_state);
963 trace_find_cmdline(field->next_pid, comm);
964 if (!trace_seq_printf(&iter->seq,
965 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
966 field->prev_pid,
967 field->prev_prio,
968 S, delim,
969 field->next_cpu,
970 field->next_pid,
971 field->next_prio,
972 T, comm))
973 return TRACE_TYPE_PARTIAL_LINE;
974
975 return TRACE_TYPE_HANDLED;
976}
977
978static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
979 struct trace_event *event)
980{
981 return trace_ctxwake_print(iter, "==>");
982}
983
984static enum print_line_t trace_wake_print(struct trace_iterator *iter,
985 int flags, struct trace_event *event)
986{
987 return trace_ctxwake_print(iter, " +");
988}
989
990static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
991{
992 struct ctx_switch_entry *field;
993 int T;
994
995 trace_assign_type(field, iter->ent);
996
997 if (!S)
998 S = task_state_char(field->prev_state);
999 T = task_state_char(field->next_state);
1000 if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
1001 field->prev_pid,
1002 field->prev_prio,
1003 S,
1004 field->next_cpu,
1005 field->next_pid,
1006 field->next_prio,
1007 T))
1008 return TRACE_TYPE_PARTIAL_LINE;
1009
1010 return TRACE_TYPE_HANDLED;
1011}
1012
1013static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
1014 struct trace_event *event)
1015{
1016 return trace_ctxwake_raw(iter, 0);
1017}
1018
1019static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
1020 struct trace_event *event)
1021{
1022 return trace_ctxwake_raw(iter, '+');
1023}
1024
1025
1026static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
1027{
1028 struct ctx_switch_entry *field;
1029 struct trace_seq *s = &iter->seq;
1030 int T;
1031
1032 trace_assign_type(field, iter->ent);
1033
1034 if (!S)
1035 S = task_state_char(field->prev_state);
1036 T = task_state_char(field->next_state);
1037
1038 SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
1039 SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
1040 SEQ_PUT_HEX_FIELD_RET(s, S);
1041 SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
1042 SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
1043 SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
1044 SEQ_PUT_HEX_FIELD_RET(s, T);
1045
1046 return TRACE_TYPE_HANDLED;
1047}
1048
1049static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1050 struct trace_event *event)
1051{
1052 return trace_ctxwake_hex(iter, 0);
1053}
1054
1055static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1056 struct trace_event *event)
1057{
1058 return trace_ctxwake_hex(iter, '+');
1059}
1060
1061static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1062 int flags, struct trace_event *event)
1063{
1064 struct ctx_switch_entry *field;
1065 struct trace_seq *s = &iter->seq;
1066
1067 trace_assign_type(field, iter->ent);
1068
1069 SEQ_PUT_FIELD_RET(s, field->prev_pid);
1070 SEQ_PUT_FIELD_RET(s, field->prev_prio);
1071 SEQ_PUT_FIELD_RET(s, field->prev_state);
1072 SEQ_PUT_FIELD_RET(s, field->next_pid);
1073 SEQ_PUT_FIELD_RET(s, field->next_prio);
1074 SEQ_PUT_FIELD_RET(s, field->next_state);
1075
1076 return TRACE_TYPE_HANDLED;
1077}
1078
1079static struct trace_event_functions trace_ctx_funcs = {
1080 .trace = trace_ctx_print,
1081 .raw = trace_ctx_raw,
1082 .hex = trace_ctx_hex,
1083 .binary = trace_ctxwake_bin,
1084};
1085
1086static struct trace_event trace_ctx_event = {
1087 .type = TRACE_CTX,
1088 .funcs = &trace_ctx_funcs,
1089};
1090
1091static struct trace_event_functions trace_wake_funcs = {
1092 .trace = trace_wake_print,
1093 .raw = trace_wake_raw,
1094 .hex = trace_wake_hex,
1095 .binary = trace_ctxwake_bin,
1096};
1097
1098static struct trace_event trace_wake_event = {
1099 .type = TRACE_WAKE,
1100 .funcs = &trace_wake_funcs,
1101};
1102
1103/* TRACE_STACK */
1104
1105static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1106 int flags, struct trace_event *event)
1107{
1108 struct stack_entry *field;
1109 struct trace_seq *s = &iter->seq;
1110 unsigned long *p;
1111 unsigned long *end;
1112
1113 trace_assign_type(field, iter->ent);
1114 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1115
1116 if (!trace_seq_puts(s, "<stack trace>\n"))
1117 goto partial;
1118
1119 for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1120 if (!trace_seq_puts(s, " => "))
1121 goto partial;
1122
1123 if (!seq_print_ip_sym(s, *p, flags))
1124 goto partial;
1125 if (!trace_seq_puts(s, "\n"))
1126 goto partial;
1127 }
1128
1129 return TRACE_TYPE_HANDLED;
1130
1131 partial:
1132 return TRACE_TYPE_PARTIAL_LINE;
1133}
1134
1135static struct trace_event_functions trace_stack_funcs = {
1136 .trace = trace_stack_print,
1137};
1138
1139static struct trace_event trace_stack_event = {
1140 .type = TRACE_STACK,
1141 .funcs = &trace_stack_funcs,
1142};
1143
1144/* TRACE_USER_STACK */
1145static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1146 int flags, struct trace_event *event)
1147{
1148 struct userstack_entry *field;
1149 struct trace_seq *s = &iter->seq;
1150
1151 trace_assign_type(field, iter->ent);
1152
1153 if (!trace_seq_puts(s, "<user stack trace>\n"))
1154 goto partial;
1155
1156 if (!seq_print_userip_objs(field, s, flags))
1157 goto partial;
1158
1159 return TRACE_TYPE_HANDLED;
1160
1161 partial:
1162 return TRACE_TYPE_PARTIAL_LINE;
1163}
1164
1165static struct trace_event_functions trace_user_stack_funcs = {
1166 .trace = trace_user_stack_print,
1167};
1168
1169static struct trace_event trace_user_stack_event = {
1170 .type = TRACE_USER_STACK,
1171 .funcs = &trace_user_stack_funcs,
1172};
1173
1174/* TRACE_BPRINT */
1175static enum print_line_t
1176trace_bprint_print(struct trace_iterator *iter, int flags,
1177 struct trace_event *event)
1178{
1179 struct trace_entry *entry = iter->ent;
1180 struct trace_seq *s = &iter->seq;
1181 struct bprint_entry *field;
1182
1183 trace_assign_type(field, entry);
1184
1185 if (!seq_print_ip_sym(s, field->ip, flags))
1186 goto partial;
1187
1188 if (!trace_seq_puts(s, ": "))
1189 goto partial;
1190
1191 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1192 goto partial;
1193
1194 return TRACE_TYPE_HANDLED;
1195
1196 partial:
1197 return TRACE_TYPE_PARTIAL_LINE;
1198}
1199
1200
1201static enum print_line_t
1202trace_bprint_raw(struct trace_iterator *iter, int flags,
1203 struct trace_event *event)
1204{
1205 struct bprint_entry *field;
1206 struct trace_seq *s = &iter->seq;
1207
1208 trace_assign_type(field, iter->ent);
1209
1210 if (!trace_seq_printf(s, ": %lx : ", field->ip))
1211 goto partial;
1212
1213 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1214 goto partial;
1215
1216 return TRACE_TYPE_HANDLED;
1217
1218 partial:
1219 return TRACE_TYPE_PARTIAL_LINE;
1220}
1221
1222static struct trace_event_functions trace_bprint_funcs = {
1223 .trace = trace_bprint_print,
1224 .raw = trace_bprint_raw,
1225};
1226
1227static struct trace_event trace_bprint_event = {
1228 .type = TRACE_BPRINT,
1229 .funcs = &trace_bprint_funcs,
1230};
1231
1232/* TRACE_PRINT */
1233static enum print_line_t trace_print_print(struct trace_iterator *iter,
1234 int flags, struct trace_event *event)
1235{
1236 struct print_entry *field;
1237 struct trace_seq *s = &iter->seq;
1238
1239 trace_assign_type(field, iter->ent);
1240
1241 if (!seq_print_ip_sym(s, field->ip, flags))
1242 goto partial;
1243
1244 if (!trace_seq_printf(s, ": %s", field->buf))
1245 goto partial;
1246
1247 return TRACE_TYPE_HANDLED;
1248
1249 partial:
1250 return TRACE_TYPE_PARTIAL_LINE;
1251}
1252
1253static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1254 struct trace_event *event)
1255{
1256 struct print_entry *field;
1257
1258 trace_assign_type(field, iter->ent);
1259
1260 if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1261 goto partial;
1262
1263 return TRACE_TYPE_HANDLED;
1264
1265 partial:
1266 return TRACE_TYPE_PARTIAL_LINE;
1267}
1268
1269static struct trace_event_functions trace_print_funcs = {
1270 .trace = trace_print_print,
1271 .raw = trace_print_raw,
1272};
1273
1274static struct trace_event trace_print_event = {
1275 .type = TRACE_PRINT,
1276 .funcs = &trace_print_funcs,
1277};
1278
1279
1280static struct trace_event *events[] __initdata = {
1281 &trace_fn_event,
1282 &trace_ctx_event,
1283 &trace_wake_event,
1284 &trace_stack_event,
1285 &trace_user_stack_event,
1286 &trace_bprint_event,
1287 &trace_print_event,
1288 NULL
1289};
1290
1291__init static int init_events(void)
1292{
1293 struct trace_event *event;
1294 int i, ret;
1295
1296 for (i = 0; events[i]; i++) {
1297 event = events[i];
1298
1299 ret = register_ftrace_event(event);
1300 if (!ret) {
1301 printk(KERN_WARNING "event %d failed to register\n",
1302 event->type);
1303 WARN_ON_ONCE(1);
1304 }
1305 }
1306
1307 return 0;
1308}
1309device_initcall(init_events);