trace_output.c 21.4 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
/*
 * trace_output.c
 *
 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
 *
 */

#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/ftrace.h>

#include "trace_output.h"

/* must be a power of 2 */
#define EVENT_HASHSIZE	128

static DEFINE_MUTEX(trace_event_mutex);
static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;

static int next_event_type = __TRACE_LAST_TYPE + 1;

22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
{
	struct trace_seq *s = &iter->seq;
	struct trace_entry *entry = iter->ent;
	struct bprint_entry *field;
	int ret;

	trace_assign_type(field, entry);

	ret = trace_seq_bprintf(s, field->fmt, field->buf);
	if (!ret)
		return TRACE_TYPE_PARTIAL_LINE;

	return TRACE_TYPE_HANDLED;
}

enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
{
	struct trace_seq *s = &iter->seq;
	struct trace_entry *entry = iter->ent;
	struct print_entry *field;
	int ret;

	trace_assign_type(field, entry);

	ret = trace_seq_printf(s, "%s", field->buf);
	if (!ret)
		return TRACE_TYPE_PARTIAL_LINE;

	return TRACE_TYPE_HANDLED;
}

54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
/**
 * trace_seq_printf - sequence printing of trace information
 * @s: trace sequence descriptor
 * @fmt: printf format string
 *
 * The tracer may use either sequence operations or its own
 * copy to user routines. To simplify formating of a trace
 * trace_seq_printf is used to store strings into a special
 * buffer (@s). Then the output may be either used by
 * the sequencer or pulled into another buffer.
 */
int
trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
{
	int len = (PAGE_SIZE - 1) - s->len;
	va_list ap;
	int ret;

	if (!len)
		return 0;

	va_start(ap, fmt);
	ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
	va_end(ap);

	/* If we can't write it all, don't bother writing anything */
	if (ret >= len)
		return 0;

	s->len += ret;

	return len;
}

88
int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
{
	int len = (PAGE_SIZE - 1) - s->len;
	int ret;

	if (!len)
		return 0;

	ret = bstr_printf(s->buffer + s->len, len, fmt, binary);

	/* If we can't write it all, don't bother writing anything */
	if (ret >= len)
		return 0;

	s->len += ret;

	return len;
}

107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
/**
 * trace_seq_puts - trace sequence printing of simple string
 * @s: trace sequence descriptor
 * @str: simple string to record
 *
 * The tracer may use either the sequence operations or its own
 * copy to user routines. This function records a simple string
 * into a special buffer (@s) for later retrieval by a sequencer
 * or other mechanism.
 */
int trace_seq_puts(struct trace_seq *s, const char *str)
{
	int len = strlen(str);

	if (len > ((PAGE_SIZE - 1) - s->len))
		return 0;

	memcpy(s->buffer + s->len, str, len);
	s->len += len;

	return len;
}

int trace_seq_putc(struct trace_seq *s, unsigned char c)
{
	if (s->len >= (PAGE_SIZE - 1))
		return 0;

	s->buffer[s->len++] = c;

	return 1;
}

int trace_seq_putmem(struct trace_seq *s, void *mem, size_t len)
{
	if (len > ((PAGE_SIZE - 1) - s->len))
		return 0;

	memcpy(s->buffer + s->len, mem, len);
	s->len += len;

	return len;
}

int trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len)
{
	unsigned char hex[HEX_CHARS];
	unsigned char *data = mem;
	int i, j;

#ifdef __BIG_ENDIAN
	for (i = 0, j = 0; i < len; i++) {
#else
	for (i = len-1, j = 0; i >= 0; i--) {
#endif
		hex[j++] = hex_asc_hi(data[i]);
		hex[j++] = hex_asc_lo(data[i]);
	}
	hex[j++] = ' ';

	return trace_seq_putmem(s, hex, j);
}

int trace_seq_path(struct trace_seq *s, struct path *path)
{
	unsigned char *p;

	if (s->len >= (PAGE_SIZE - 1))
		return 0;
	p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
	if (!IS_ERR(p)) {
		p = mangle_path(s->buffer + s->len, p, "\n");
		if (p) {
			s->len = p - s->buffer;
			return 1;
		}
	} else {
		s->buffer[s->len++] = '?';
		return 1;
	}

	return 0;
}

#ifdef CONFIG_KRETPROBES
static inline const char *kretprobed(const char *name)
{
	static const char tramp_name[] = "kretprobe_trampoline";
	int size = sizeof(tramp_name);

	if (strncmp(tramp_name, name, size) == 0)
		return "[unknown/kretprobe'd]";
	return name;
}
#else
static inline const char *kretprobed(const char *name)
{
	return name;
}
#endif /* CONFIG_KRETPROBES */

static int
seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
{
#ifdef CONFIG_KALLSYMS
	char str[KSYM_SYMBOL_LEN];
	const char *name;

	kallsyms_lookup(address, NULL, NULL, NULL, str);

	name = kretprobed(str);

	return trace_seq_printf(s, fmt, name);
#endif
	return 1;
}

static int
seq_print_sym_offset(struct trace_seq *s, const char *fmt,
		     unsigned long address)
{
#ifdef CONFIG_KALLSYMS
	char str[KSYM_SYMBOL_LEN];
	const char *name;

	sprint_symbol(str, address);
	name = kretprobed(str);

	return trace_seq_printf(s, fmt, name);
#endif
	return 1;
}

#ifndef CONFIG_64BIT
# define IP_FMT "%08lx"
#else
# define IP_FMT "%016lx"
#endif

int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
		      unsigned long ip, unsigned long sym_flags)
{
	struct file *file = NULL;
	unsigned long vmstart = 0;
	int ret = 1;

	if (mm) {
		const struct vm_area_struct *vma;

		down_read(&mm->mmap_sem);
		vma = find_vma(mm, ip);
		if (vma) {
			file = vma->vm_file;
			vmstart = vma->vm_start;
		}
		if (file) {
			ret = trace_seq_path(s, &file->f_path);
			if (ret)
				ret = trace_seq_printf(s, "[+0x%lx]",
						       ip - vmstart);
		}
		up_read(&mm->mmap_sem);
	}
	if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
		ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
	return ret;
}

int
seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
		      unsigned long sym_flags)
{
	struct mm_struct *mm = NULL;
	int ret = 1;
	unsigned int i;

	if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
		struct task_struct *task;
		/*
		 * we do the lookup on the thread group leader,
		 * since individual threads might have already quit!
		 */
		rcu_read_lock();
		task = find_task_by_vpid(entry->ent.tgid);
		if (task)
			mm = get_task_mm(task);
		rcu_read_unlock();
	}

	for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
		unsigned long ip = entry->caller[i];

		if (ip == ULONG_MAX || !ret)
			break;
		if (i && ret)
			ret = trace_seq_puts(s, " <- ");
		if (!ip) {
			if (ret)
				ret = trace_seq_puts(s, "??");
			continue;
		}
		if (!ret)
			break;
		if (ret)
			ret = seq_print_user_ip(s, mm, ip, sym_flags);
	}

	if (mm)
		mmput(mm);
	return ret;
}

int
seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
{
	int ret;

	if (!ip)
		return trace_seq_printf(s, "0");

	if (sym_flags & TRACE_ITER_SYM_OFFSET)
		ret = seq_print_sym_offset(s, "%s", ip);
	else
		ret = seq_print_sym_short(s, "%s", ip);

	if (!ret)
		return 0;

	if (sym_flags & TRACE_ITER_SYM_ADDR)
		ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
	return ret;
}

340
static int
341
342
343
lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
{
	int hardirq, softirq;
344
	char comm[TASK_COMM_LEN];
345

346
	trace_find_cmdline(entry->pid, comm);
347
348
	hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
	softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
349
350
351
352
353
354
355
356
357
358
359

	if (!trace_seq_printf(s, "%8.8s-%-5d %3d%c%c%c",
			      comm, entry->pid, cpu,
			      (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
				(entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
				  'X' : '.',
			      (entry->flags & TRACE_FLAG_NEED_RESCHED) ?
				'N' : '.',
			      (hardirq && softirq) ? 'H' :
				hardirq ? 'h' : softirq ? 's' : '.'))
		return 0;
360
361

	if (entry->preempt_count)
362
363
		return trace_seq_printf(s, "%x", entry->preempt_count);
	return trace_seq_puts(s, ".");
364
365
366
367
}

static unsigned long preempt_mark_thresh = 100;

368
static int
369
370
371
lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
		    unsigned long rel_usecs)
{
372
373
374
	return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
				rel_usecs > preempt_mark_thresh ? '!' :
				  rel_usecs > 1 ? '+' : ' ');
375
376
377
378
379
380
381
382
383
}

int trace_print_context(struct trace_iterator *iter)
{
	struct trace_seq *s = &iter->seq;
	struct trace_entry *entry = iter->ent;
	unsigned long long t = ns2usecs(iter->ts);
	unsigned long usec_rem = do_div(t, USEC_PER_SEC);
	unsigned long secs = (unsigned long)t;
384
385
386
	char comm[TASK_COMM_LEN];

	trace_find_cmdline(entry->pid, comm);
387

388
	return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
389
				comm, entry->pid, iter->cpu, secs, usec_rem);
390
391
392
393
394
}

int trace_print_lat_context(struct trace_iterator *iter)
{
	u64 next_ts;
395
	int ret;
396
397
398
399
400
401
402
403
404
405
406
407
408
	struct trace_seq *s = &iter->seq;
	struct trace_entry *entry = iter->ent,
			   *next_entry = trace_find_next_entry(iter, NULL,
							       &next_ts);
	unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
	unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
	unsigned long rel_usecs;

	if (!next_entry)
		next_ts = iter->ts;
	rel_usecs = ns2usecs(next_ts - iter->ts);

	if (verbose) {
409
410
411
412
		char comm[TASK_COMM_LEN];

		trace_find_cmdline(entry->pid, comm);

413
414
		ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08lx]"
				       " %ld.%03ldms (+%ld.%03ldms): ", comm,
415
				       entry->pid, iter->cpu, entry->flags,
416
417
418
419
420
421
				       entry->preempt_count, iter->idx,
				       ns2usecs(iter->ts),
				       abs_usecs / USEC_PER_MSEC,
				       abs_usecs % USEC_PER_MSEC,
				       rel_usecs / USEC_PER_MSEC,
				       rel_usecs % USEC_PER_MSEC);
422
	} else {
423
		ret = lat_print_generic(s, entry, iter->cpu);
424
425
		if (ret)
			ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
426
427
	}

428
	return ret;
429
430
}

431
432
433
434
435
436
437
438
439
static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;

static int task_state_char(unsigned long state)
{
	int bit = state ? __ffs(state) + 1 : 0;

	return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
}

440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
/**
 * ftrace_find_event - find a registered event
 * @type: the type of event to look for
 *
 * Returns an event of type @type otherwise NULL
 */
struct trace_event *ftrace_find_event(int type)
{
	struct trace_event *event;
	struct hlist_node *n;
	unsigned key;

	key = type & (EVENT_HASHSIZE - 1);

	hlist_for_each_entry_rcu(event, n, &event_hash[key], node) {
		if (event->type == type)
			return event;
	}

	return NULL;
}

/**
 * register_ftrace_event - register output for an event type
 * @event: the event type to register
 *
 * Event types are stored in a hash and this hash is used to
 * find a way to print an event. If the @event->type is set
 * then it will use that type, otherwise it will assign a
 * type to use.
 *
 * If you assign your own type, please make sure it is added
 * to the trace_type enum in trace.h, to avoid collisions
 * with the dynamic types.
 *
 * Returns the event type number or zero on error.
 */
int register_ftrace_event(struct trace_event *event)
{
	unsigned key;
	int ret = 0;

	mutex_lock(&trace_event_mutex);

	if (!event->type)
		event->type = next_event_type++;
	else if (event->type > __TRACE_LAST_TYPE) {
		printk(KERN_WARNING "Need to add type to trace.h\n");
		WARN_ON(1);
	}

	if (ftrace_find_event(event->type))
		goto out;

494
495
496
497
498
499
500
501
502
	if (event->trace == NULL)
		event->trace = trace_nop_print;
	if (event->raw == NULL)
		event->raw = trace_nop_print;
	if (event->hex == NULL)
		event->hex = trace_nop_print;
	if (event->binary == NULL)
		event->binary = trace_nop_print;

503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
	key = event->type & (EVENT_HASHSIZE - 1);

	hlist_add_head_rcu(&event->node, &event_hash[key]);

	ret = event->type;
 out:
	mutex_unlock(&trace_event_mutex);

	return ret;
}

/**
 * unregister_ftrace_event - remove a no longer used event
 * @event: the event to remove
 */
int unregister_ftrace_event(struct trace_event *event)
{
	mutex_lock(&trace_event_mutex);
	hlist_del(&event->node);
	mutex_unlock(&trace_event_mutex);

	return 0;
}
526
527
528
529
530

/*
 * Standard events
 */

531
enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags)
532
{
533
	return TRACE_TYPE_HANDLED;
534
535
536
}

/* TRACE_FN */
537
static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags)
538
539
{
	struct ftrace_entry *field;
540
	struct trace_seq *s = &iter->seq;
541

542
	trace_assign_type(field, iter->ent);
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557

	if (!seq_print_ip_sym(s, field->ip, flags))
		goto partial;

	if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
		if (!trace_seq_printf(s, " <-"))
			goto partial;
		if (!seq_print_ip_sym(s,
				      field->parent_ip,
				      flags))
			goto partial;
	}
	if (!trace_seq_printf(s, "\n"))
		goto partial;

558
	return TRACE_TYPE_HANDLED;
559
560
561
562
563

 partial:
	return TRACE_TYPE_PARTIAL_LINE;
}

564
static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags)
565
566
567
{
	struct ftrace_entry *field;

568
	trace_assign_type(field, iter->ent);
569

570
	if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
Lai Jiangshan's avatar
Lai Jiangshan committed
571
572
			      field->ip,
			      field->parent_ip))
573
574
		return TRACE_TYPE_PARTIAL_LINE;

575
	return TRACE_TYPE_HANDLED;
576
577
}

578
static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags)
579
580
{
	struct ftrace_entry *field;
581
	struct trace_seq *s = &iter->seq;
582

583
	trace_assign_type(field, iter->ent);
584
585
586
587

	SEQ_PUT_HEX_FIELD_RET(s, field->ip);
	SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);

588
	return TRACE_TYPE_HANDLED;
589
590
}

591
static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags)
592
593
{
	struct ftrace_entry *field;
594
	struct trace_seq *s = &iter->seq;
595

596
	trace_assign_type(field, iter->ent);
597
598
599
600

	SEQ_PUT_FIELD_RET(s, field->ip);
	SEQ_PUT_FIELD_RET(s, field->parent_ip);

601
	return TRACE_TYPE_HANDLED;
602
603
604
}

static struct trace_event trace_fn_event = {
605
	.type		= TRACE_FN,
606
607
608
609
610
611
612
	.trace		= trace_fn_trace,
	.raw		= trace_fn_raw,
	.hex		= trace_fn_hex,
	.binary		= trace_fn_bin,
};

/* TRACE_CTX an TRACE_WAKE */
613
614
static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
					     char *delim)
615
616
{
	struct ctx_switch_entry *field;
617
	char comm[TASK_COMM_LEN];
618
619
	int S, T;

620

621
	trace_assign_type(field, iter->ent);
622
623
624

	T = task_state_char(field->next_state);
	S = task_state_char(field->prev_state);
625
	trace_find_cmdline(field->next_pid, comm);
626
627
	if (!trace_seq_printf(&iter->seq,
			      " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
Lai Jiangshan's avatar
Lai Jiangshan committed
628
629
630
631
632
633
634
			      field->prev_pid,
			      field->prev_prio,
			      S, delim,
			      field->next_cpu,
			      field->next_pid,
			      field->next_prio,
			      T, comm))
635
636
		return TRACE_TYPE_PARTIAL_LINE;

637
	return TRACE_TYPE_HANDLED;
638
639
}

640
static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags)
641
{
642
	return trace_ctxwake_print(iter, "==>");
643
644
}

645
646
static enum print_line_t trace_wake_print(struct trace_iterator *iter,
					  int flags)
647
{
648
	return trace_ctxwake_print(iter, "  +");
649
650
}

651
static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
652
653
654
655
{
	struct ctx_switch_entry *field;
	int T;

656
	trace_assign_type(field, iter->ent);
657
658
659
660

	if (!S)
		task_state_char(field->prev_state);
	T = task_state_char(field->next_state);
661
	if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
Lai Jiangshan's avatar
Lai Jiangshan committed
662
663
664
665
666
667
668
			      field->prev_pid,
			      field->prev_prio,
			      S,
			      field->next_cpu,
			      field->next_pid,
			      field->next_prio,
			      T))
669
670
		return TRACE_TYPE_PARTIAL_LINE;

671
	return TRACE_TYPE_HANDLED;
672
673
}

674
static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags)
675
{
676
	return trace_ctxwake_raw(iter, 0);
677
678
}

679
static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags)
680
{
681
	return trace_ctxwake_raw(iter, '+');
682
683
684
}


685
static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
686
687
{
	struct ctx_switch_entry *field;
688
	struct trace_seq *s = &iter->seq;
689
690
	int T;

691
	trace_assign_type(field, iter->ent);
692
693
694
695
696
697
698
699
700
701
702
703
704

	if (!S)
		task_state_char(field->prev_state);
	T = task_state_char(field->next_state);

	SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
	SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
	SEQ_PUT_HEX_FIELD_RET(s, S);
	SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
	SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
	SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
	SEQ_PUT_HEX_FIELD_RET(s, T);

705
	return TRACE_TYPE_HANDLED;
706
707
}

708
static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags)
709
{
710
	return trace_ctxwake_hex(iter, 0);
711
712
}

713
static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags)
714
{
715
	return trace_ctxwake_hex(iter, '+');
716
717
}

718
719
static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
					   int flags)
720
721
{
	struct ctx_switch_entry *field;
722
	struct trace_seq *s = &iter->seq;
723

724
	trace_assign_type(field, iter->ent);
725
726
727
728
729
730
731
732

	SEQ_PUT_FIELD_RET(s, field->prev_pid);
	SEQ_PUT_FIELD_RET(s, field->prev_prio);
	SEQ_PUT_FIELD_RET(s, field->prev_state);
	SEQ_PUT_FIELD_RET(s, field->next_pid);
	SEQ_PUT_FIELD_RET(s, field->next_prio);
	SEQ_PUT_FIELD_RET(s, field->next_state);

733
	return TRACE_TYPE_HANDLED;
734
735
736
}

static struct trace_event trace_ctx_event = {
737
	.type		= TRACE_CTX,
738
739
740
741
742
743
744
	.trace		= trace_ctx_print,
	.raw		= trace_ctx_raw,
	.hex		= trace_ctx_hex,
	.binary		= trace_ctxwake_bin,
};

static struct trace_event trace_wake_event = {
745
	.type		= TRACE_WAKE,
746
747
748
749
750
751
752
	.trace		= trace_wake_print,
	.raw		= trace_wake_raw,
	.hex		= trace_wake_hex,
	.binary		= trace_ctxwake_bin,
};

/* TRACE_SPECIAL */
753
754
static enum print_line_t trace_special_print(struct trace_iterator *iter,
					     int flags)
755
756
757
{
	struct special_entry *field;

758
	trace_assign_type(field, iter->ent);
759

760
	if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
Lai Jiangshan's avatar
Lai Jiangshan committed
761
762
763
			      field->arg1,
			      field->arg2,
			      field->arg3))
764
765
		return TRACE_TYPE_PARTIAL_LINE;

766
	return TRACE_TYPE_HANDLED;
767
768
}

769
770
static enum print_line_t trace_special_hex(struct trace_iterator *iter,
					   int flags)
771
772
{
	struct special_entry *field;
773
	struct trace_seq *s = &iter->seq;
774

775
	trace_assign_type(field, iter->ent);
776
777
778
779
780

	SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
	SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
	SEQ_PUT_HEX_FIELD_RET(s, field->arg3);

781
	return TRACE_TYPE_HANDLED;
782
783
}

784
785
static enum print_line_t trace_special_bin(struct trace_iterator *iter,
					   int flags)
786
787
{
	struct special_entry *field;
788
	struct trace_seq *s = &iter->seq;
789

790
	trace_assign_type(field, iter->ent);
791
792
793
794
795

	SEQ_PUT_FIELD_RET(s, field->arg1);
	SEQ_PUT_FIELD_RET(s, field->arg2);
	SEQ_PUT_FIELD_RET(s, field->arg3);

796
	return TRACE_TYPE_HANDLED;
797
798
799
}

static struct trace_event trace_special_event = {
800
	.type		= TRACE_SPECIAL,
801
802
803
804
805
806
807
808
	.trace		= trace_special_print,
	.raw		= trace_special_print,
	.hex		= trace_special_hex,
	.binary		= trace_special_bin,
};

/* TRACE_STACK */

809
810
static enum print_line_t trace_stack_print(struct trace_iterator *iter,
					   int flags)
811
812
{
	struct stack_entry *field;
813
	struct trace_seq *s = &iter->seq;
814
815
	int i;

816
	trace_assign_type(field, iter->ent);
817
818
819

	for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
		if (i) {
Lai Jiangshan's avatar
Lai Jiangshan committed
820
			if (!trace_seq_puts(s, " <= "))
821
822
				goto partial;

Lai Jiangshan's avatar
Lai Jiangshan committed
823
			if (!seq_print_ip_sym(s, field->caller[i], flags))
824
825
				goto partial;
		}
Lai Jiangshan's avatar
Lai Jiangshan committed
826
		if (!trace_seq_puts(s, "\n"))
827
828
829
			goto partial;
	}

830
	return TRACE_TYPE_HANDLED;
831
832
833
834
835
836

 partial:
	return TRACE_TYPE_PARTIAL_LINE;
}

static struct trace_event trace_stack_event = {
837
	.type		= TRACE_STACK,
838
839
840
841
842
843
844
	.trace		= trace_stack_print,
	.raw		= trace_special_print,
	.hex		= trace_special_hex,
	.binary		= trace_special_bin,
};

/* TRACE_USER_STACK */
845
846
static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
						int flags)
847
848
{
	struct userstack_entry *field;
849
	struct trace_seq *s = &iter->seq;
850

851
	trace_assign_type(field, iter->ent);
852

Lai Jiangshan's avatar
Lai Jiangshan committed
853
	if (!seq_print_userip_objs(field, s, flags))
854
855
		goto partial;

Lai Jiangshan's avatar
Lai Jiangshan committed
856
	if (!trace_seq_putc(s, '\n'))
857
858
		goto partial;

859
	return TRACE_TYPE_HANDLED;
860
861
862
863
864
865

 partial:
	return TRACE_TYPE_PARTIAL_LINE;
}

static struct trace_event trace_user_stack_event = {
866
	.type		= TRACE_USER_STACK,
867
868
869
870
871
872
	.trace		= trace_user_stack_print,
	.raw		= trace_special_print,
	.hex		= trace_special_hex,
	.binary		= trace_special_bin,
};

873
/* TRACE_BPRINT */
874
static enum print_line_t
875
trace_bprint_print(struct trace_iterator *iter, int flags)
876
877
878
{
	struct trace_entry *entry = iter->ent;
	struct trace_seq *s = &iter->seq;
879
	struct bprint_entry *field;
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897

	trace_assign_type(field, entry);

	if (!seq_print_ip_sym(s, field->ip, flags))
		goto partial;

	if (!trace_seq_puts(s, ": "))
		goto partial;

	if (!trace_seq_bprintf(s, field->fmt, field->buf))
		goto partial;

	return TRACE_TYPE_HANDLED;

 partial:
	return TRACE_TYPE_PARTIAL_LINE;
}

898

899
900
static enum print_line_t
trace_bprint_raw(struct trace_iterator *iter, int flags)
901
{
902
	struct bprint_entry *field;
903
904
	struct trace_seq *s = &iter->seq;

905
	trace_assign_type(field, iter->ent);
906
907
908
909
910
911
912
913
914
915
916
917
918

	if (!trace_seq_printf(s, ": %lx : ", field->ip))
		goto partial;

	if (!trace_seq_bprintf(s, field->fmt, field->buf))
		goto partial;

	return TRACE_TYPE_HANDLED;

 partial:
	return TRACE_TYPE_PARTIAL_LINE;
}

919

920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
static struct trace_event trace_bprint_event = {
	.type		= TRACE_BPRINT,
	.trace		= trace_bprint_print,
	.raw		= trace_bprint_raw,
};

/* TRACE_PRINT */
static enum print_line_t trace_print_print(struct trace_iterator *iter,
					   int flags)
{
	struct print_entry *field;
	struct trace_seq *s = &iter->seq;

	trace_assign_type(field, iter->ent);

	if (!seq_print_ip_sym(s, field->ip, flags))
		goto partial;

	if (!trace_seq_printf(s, ": %s", field->buf))
		goto partial;

	return TRACE_TYPE_HANDLED;

 partial:
	return TRACE_TYPE_PARTIAL_LINE;
}

static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
{
	struct print_entry *field;

	trace_assign_type(field, iter->ent);

	if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
		goto partial;

	return TRACE_TYPE_HANDLED;

 partial:
	return TRACE_TYPE_PARTIAL_LINE;
}

962
static struct trace_event trace_print_event = {
963
	.type	 	= TRACE_PRINT,
964
965
	.trace		= trace_print_print,
	.raw		= trace_print_raw,
966
967
};

968

969
970
971
972
973
974
975
static struct trace_event *events[] __initdata = {
	&trace_fn_event,
	&trace_ctx_event,
	&trace_wake_event,
	&trace_special_event,
	&trace_stack_event,
	&trace_user_stack_event,
976
	&trace_bprint_event,
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
	&trace_print_event,
	NULL
};

__init static int init_events(void)
{
	struct trace_event *event;
	int i, ret;

	for (i = 0; events[i]; i++) {
		event = events[i];

		ret = register_ftrace_event(event);
		if (!ret) {
			printk(KERN_WARNING "event %d failed to register\n",
			       event->type);
			WARN_ON_ONCE(1);
		}
	}

	return 0;
}
device_initcall(init_events);