trace_output.c 24.5 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
/*
 * 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

17
static DECLARE_RWSEM(trace_event_mutex);
18
19

DEFINE_PER_CPU(struct trace_seq, ftrace_event_seq);
20
EXPORT_PER_CPU_SYMBOL(ftrace_event_seq);
21

22
23
24
25
static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;

static int next_event_type = __TRACE_LAST_TYPE + 1;

26
27
28
29
30
31
32
33
34
35
void trace_print_seq(struct seq_file *m, struct trace_seq *s)
{
	int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;

	s->buffer[len] = 0;
	seq_puts(m, s->buffer);

	trace_seq_init(s);
}

36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
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;
}

68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
/**
 * 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;
}
101
EXPORT_SYMBOL_GPL(trace_seq_printf);
102

103
int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
{
	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;
}

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
/**
 * 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;
}

155
int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
156
157
158
159
160
161
162
163
164
165
{
	if (len > ((PAGE_SIZE - 1) - s->len))
		return 0;

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

	return len;
}

166
int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
167
168
{
	unsigned char hex[HEX_CHARS];
169
	const unsigned char *data = mem;
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
	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);
}

185
186
187
188
189
190
191
192
193
194
195
196
197
void *trace_seq_reserve(struct trace_seq *s, size_t len)
{
	void *ret;

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

	ret = s->buffer + s->len;
	s->len += len;

	return ret;
}

198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
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;
}

219
220
221
222
223
224
225
const char *
ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
		       unsigned long flags,
		       const struct trace_print_flags *flag_array)
{
	unsigned long mask;
	const char *str;
226
	const char *ret = p->buffer + p->len;
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
	int i;

	for (i = 0;  flag_array[i].name && flags; i++) {

		mask = flag_array[i].mask;
		if ((flags & mask) != mask)
			continue;

		str = flag_array[i].name;
		flags &= ~mask;
		if (p->len && delim)
			trace_seq_puts(p, delim);
		trace_seq_puts(p, str);
	}

	/* check for left over flags */
	if (flags) {
		if (p->len && delim)
			trace_seq_puts(p, delim);
		trace_seq_printf(p, "0x%lx", flags);
	}

	trace_seq_putc(p, 0);

251
	return ret;
252
}
253
EXPORT_SYMBOL(ftrace_print_flags_seq);
254

255
256
257
258
259
const char *
ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
			 const struct trace_print_flags *symbol_array)
{
	int i;
260
	const char *ret = p->buffer + p->len;
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275

	for (i = 0;  symbol_array[i].name; i++) {

		if (val != symbol_array[i].mask)
			continue;

		trace_seq_puts(p, symbol_array[i].name);
		break;
	}

	if (!p->len)
		trace_seq_printf(p, "0x%lx", val);
		
	trace_seq_putc(p, 0);

276
	return ret;
277
}
278
EXPORT_SYMBOL(ftrace_print_symbols_seq);
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
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
#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;
390
391
		if (ret)
			ret = trace_seq_puts(s, " => ");
392
393
394
		if (!ip) {
			if (ret)
				ret = trace_seq_puts(s, "??");
395
396
			if (ret)
				ret = trace_seq_puts(s, "\n");
397
398
399
400
401
402
			continue;
		}
		if (!ret)
			break;
		if (ret)
			ret = seq_print_user_ip(s, mm, ip, sym_flags);
403
		ret = trace_seq_puts(s, "\n");
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
	}

	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;
}

432
static int
433
434
435
lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
{
	int hardirq, softirq;
436
	char comm[TASK_COMM_LEN];
437

438
	trace_find_cmdline(entry->pid, comm);
439
440
	hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
	softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
441
442
443
444
445
446
447
448
449
450
451

	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;
452
453

	if (entry->preempt_count)
454
455
		return trace_seq_printf(s, "%x", entry->preempt_count);
	return trace_seq_puts(s, ".");
456
457
458
459
}

static unsigned long preempt_mark_thresh = 100;

460
static int
461
462
463
lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
		    unsigned long rel_usecs)
{
464
465
466
	return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
				rel_usecs > preempt_mark_thresh ? '!' :
				  rel_usecs > 1 ? '+' : ' ');
467
468
469
470
471
472
473
474
475
}

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;
476
477
478
	char comm[TASK_COMM_LEN];

	trace_find_cmdline(entry->pid, comm);
479

480
	return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
481
				comm, entry->pid, iter->cpu, secs, usec_rem);
482
483
484
485
486
}

int trace_print_lat_context(struct trace_iterator *iter)
{
	u64 next_ts;
487
	int ret;
488
489
490
491
492
493
494
495
496
497
498
499
500
	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) {
501
502
503
504
		char comm[TASK_COMM_LEN];

		trace_find_cmdline(entry->pid, comm);

505
		ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
506
				       " %ld.%03ldms (+%ld.%03ldms): ", comm,
507
				       entry->pid, iter->cpu, entry->flags,
508
509
510
511
512
513
				       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);
514
	} else {
515
		ret = lat_print_generic(s, entry, iter->cpu);
516
517
		if (ret)
			ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
518
519
	}

520
	return ret;
521
522
}

523
524
525
526
527
528
529
530
531
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] : '?';
}

532
533
534
535
536
/**
 * ftrace_find_event - find a registered event
 * @type: the type of event to look for
 *
 * Returns an event of type @type otherwise NULL
537
 * Called with trace_event_read_lock() held.
538
539
540
541
542
543
544
545
546
 */
struct trace_event *ftrace_find_event(int type)
{
	struct trace_event *event;
	struct hlist_node *n;
	unsigned key;

	key = type & (EVENT_HASHSIZE - 1);

547
	hlist_for_each_entry(event, n, &event_hash[key], node) {
548
549
550
551
552
553
554
		if (event->type == type)
			return event;
	}

	return NULL;
}

555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
static LIST_HEAD(ftrace_event_list);

static int trace_search_list(struct list_head **list)
{
	struct trace_event *e;
	int last = __TRACE_LAST_TYPE;

	if (list_empty(&ftrace_event_list)) {
		*list = &ftrace_event_list;
		return last + 1;
	}

	/*
	 * We used up all possible max events,
	 * lets see if somebody freed one.
	 */
	list_for_each_entry(e, &ftrace_event_list, list) {
		if (e->type != last + 1)
			break;
		last++;
	}

	/* Did we used up all 65 thousand events??? */
	if ((last + 1) > FTRACE_MAX_EVENT)
		return 0;

	*list = &e->list;
	return last + 1;
}

585
586
587
588
589
590
591
592
593
594
void trace_event_read_lock(void)
{
	down_read(&trace_event_mutex);
}

void trace_event_read_unlock(void)
{
	up_read(&trace_event_mutex);
}

595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
/**
 * 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;

615
	down_write(&trace_event_mutex);
616

617
	if (WARN_ON(!event))
618
619
		goto out;

620
621
622
	INIT_LIST_HEAD(&event->list);

	if (!event->type) {
623
		struct list_head *list = NULL;
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642

		if (next_event_type > FTRACE_MAX_EVENT) {

			event->type = trace_search_list(&list);
			if (!event->type)
				goto out;

		} else {
			
			event->type = next_event_type++;
			list = &ftrace_event_list;
		}

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

		list_add_tail(&event->list, list);

	} else if (event->type > __TRACE_LAST_TYPE) {
643
644
645
		printk(KERN_WARNING "Need to add type to trace.h\n");
		WARN_ON(1);
		goto out;
646
647
648
649
650
	} else {
		/* Is this event already used */
		if (ftrace_find_event(event->type))
			goto out;
	}
651

652
653
654
655
656
657
658
659
660
	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;

661
662
	key = event->type & (EVENT_HASHSIZE - 1);

663
	hlist_add_head(&event->node, &event_hash[key]);
664
665
666

	ret = event->type;
 out:
667
	up_write(&trace_event_mutex);
668
669
670

	return ret;
}
671
EXPORT_SYMBOL_GPL(register_ftrace_event);
672
673
674
675
676
677
678

/**
 * unregister_ftrace_event - remove a no longer used event
 * @event: the event to remove
 */
int unregister_ftrace_event(struct trace_event *event)
{
679
	down_write(&trace_event_mutex);
680
	hlist_del(&event->node);
681
	list_del(&event->list);
682
	up_write(&trace_event_mutex);
683
684
685

	return 0;
}
686
EXPORT_SYMBOL_GPL(unregister_ftrace_event);
687
688
689
690
691

/*
 * Standard events
 */

692
enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags)
693
{
694
	return TRACE_TYPE_HANDLED;
695
696
697
}

/* TRACE_FN */
698
static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags)
699
700
{
	struct ftrace_entry *field;
701
	struct trace_seq *s = &iter->seq;
702

703
	trace_assign_type(field, iter->ent);
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718

	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;

719
	return TRACE_TYPE_HANDLED;
720
721
722
723
724

 partial:
	return TRACE_TYPE_PARTIAL_LINE;
}

725
static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags)
726
727
728
{
	struct ftrace_entry *field;

729
	trace_assign_type(field, iter->ent);
730

731
	if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
Lai Jiangshan's avatar
Lai Jiangshan committed
732
733
			      field->ip,
			      field->parent_ip))
734
735
		return TRACE_TYPE_PARTIAL_LINE;

736
	return TRACE_TYPE_HANDLED;
737
738
}

739
static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags)
740
741
{
	struct ftrace_entry *field;
742
	struct trace_seq *s = &iter->seq;
743

744
	trace_assign_type(field, iter->ent);
745
746
747
748

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

749
	return TRACE_TYPE_HANDLED;
750
751
}

752
static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags)
753
754
{
	struct ftrace_entry *field;
755
	struct trace_seq *s = &iter->seq;
756

757
	trace_assign_type(field, iter->ent);
758
759
760
761

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

762
	return TRACE_TYPE_HANDLED;
763
764
765
}

static struct trace_event trace_fn_event = {
766
	.type		= TRACE_FN,
767
768
769
770
771
772
773
	.trace		= trace_fn_trace,
	.raw		= trace_fn_raw,
	.hex		= trace_fn_hex,
	.binary		= trace_fn_bin,
};

/* TRACE_CTX an TRACE_WAKE */
774
775
static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
					     char *delim)
776
777
{
	struct ctx_switch_entry *field;
778
	char comm[TASK_COMM_LEN];
779
780
	int S, T;

781

782
	trace_assign_type(field, iter->ent);
783
784
785

	T = task_state_char(field->next_state);
	S = task_state_char(field->prev_state);
786
	trace_find_cmdline(field->next_pid, comm);
787
788
	if (!trace_seq_printf(&iter->seq,
			      " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
Lai Jiangshan's avatar
Lai Jiangshan committed
789
790
791
792
793
794
795
			      field->prev_pid,
			      field->prev_prio,
			      S, delim,
			      field->next_cpu,
			      field->next_pid,
			      field->next_prio,
			      T, comm))
796
797
		return TRACE_TYPE_PARTIAL_LINE;

798
	return TRACE_TYPE_HANDLED;
799
800
}

801
static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags)
802
{
803
	return trace_ctxwake_print(iter, "==>");
804
805
}

806
807
static enum print_line_t trace_wake_print(struct trace_iterator *iter,
					  int flags)
808
{
809
	return trace_ctxwake_print(iter, "  +");
810
811
}

812
static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
813
814
815
816
{
	struct ctx_switch_entry *field;
	int T;

817
	trace_assign_type(field, iter->ent);
818
819
820
821

	if (!S)
		task_state_char(field->prev_state);
	T = task_state_char(field->next_state);
822
	if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
Lai Jiangshan's avatar
Lai Jiangshan committed
823
824
825
826
827
828
829
			      field->prev_pid,
			      field->prev_prio,
			      S,
			      field->next_cpu,
			      field->next_pid,
			      field->next_prio,
			      T))
830
831
		return TRACE_TYPE_PARTIAL_LINE;

832
	return TRACE_TYPE_HANDLED;
833
834
}

835
static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags)
836
{
837
	return trace_ctxwake_raw(iter, 0);
838
839
}

840
static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags)
841
{
842
	return trace_ctxwake_raw(iter, '+');
843
844
845
}


846
static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
847
848
{
	struct ctx_switch_entry *field;
849
	struct trace_seq *s = &iter->seq;
850
851
	int T;

852
	trace_assign_type(field, iter->ent);
853
854
855
856
857
858
859
860
861
862
863
864
865

	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);

866
	return TRACE_TYPE_HANDLED;
867
868
}

869
static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags)
870
{
871
	return trace_ctxwake_hex(iter, 0);
872
873
}

874
static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags)
875
{
876
	return trace_ctxwake_hex(iter, '+');
877
878
}

879
880
static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
					   int flags)
881
882
{
	struct ctx_switch_entry *field;
883
	struct trace_seq *s = &iter->seq;
884

885
	trace_assign_type(field, iter->ent);
886
887
888
889
890
891
892
893

	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);

894
	return TRACE_TYPE_HANDLED;
895
896
897
}

static struct trace_event trace_ctx_event = {
898
	.type		= TRACE_CTX,
899
900
901
902
903
904
905
	.trace		= trace_ctx_print,
	.raw		= trace_ctx_raw,
	.hex		= trace_ctx_hex,
	.binary		= trace_ctxwake_bin,
};

static struct trace_event trace_wake_event = {
906
	.type		= TRACE_WAKE,
907
908
909
910
911
912
913
	.trace		= trace_wake_print,
	.raw		= trace_wake_raw,
	.hex		= trace_wake_hex,
	.binary		= trace_ctxwake_bin,
};

/* TRACE_SPECIAL */
914
915
static enum print_line_t trace_special_print(struct trace_iterator *iter,
					     int flags)
916
917
918
{
	struct special_entry *field;

919
	trace_assign_type(field, iter->ent);
920

921
	if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
Lai Jiangshan's avatar
Lai Jiangshan committed
922
923
924
			      field->arg1,
			      field->arg2,
			      field->arg3))
925
926
		return TRACE_TYPE_PARTIAL_LINE;

927
	return TRACE_TYPE_HANDLED;
928
929
}

930
931
static enum print_line_t trace_special_hex(struct trace_iterator *iter,
					   int flags)
932
933
{
	struct special_entry *field;
934
	struct trace_seq *s = &iter->seq;
935

936
	trace_assign_type(field, iter->ent);
937
938
939
940
941

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

942
	return TRACE_TYPE_HANDLED;
943
944
}

945
946
static enum print_line_t trace_special_bin(struct trace_iterator *iter,
					   int flags)
947
948
{
	struct special_entry *field;
949
	struct trace_seq *s = &iter->seq;
950

951
	trace_assign_type(field, iter->ent);
952
953
954
955
956

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

957
	return TRACE_TYPE_HANDLED;
958
959
960
}

static struct trace_event trace_special_event = {
961
	.type		= TRACE_SPECIAL,
962
963
964
965
966
967
968
969
	.trace		= trace_special_print,
	.raw		= trace_special_print,
	.hex		= trace_special_hex,
	.binary		= trace_special_bin,
};

/* TRACE_STACK */

970
971
static enum print_line_t trace_stack_print(struct trace_iterator *iter,
					   int flags)
972
973
{
	struct stack_entry *field;
974
	struct trace_seq *s = &iter->seq;
975
976
	int i;

977
	trace_assign_type(field, iter->ent);
978

979
	if (!trace_seq_puts(s, "<stack trace>\n"))
980
		goto partial;
981
	for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
982
		if (!field->caller[i] || (field->caller[i] == ULONG_MAX))
983
			break;
984
985
		if (!trace_seq_puts(s, " => "))
			goto partial;
986

987
988
		if (!seq_print_ip_sym(s, field->caller[i], flags))
			goto partial;
Lai Jiangshan's avatar
Lai Jiangshan committed
989
		if (!trace_seq_puts(s, "\n"))
990
991
992
			goto partial;
	}

993
	return TRACE_TYPE_HANDLED;
994
995
996
997
998
999

 partial:
	return TRACE_TYPE_PARTIAL_LINE;
}

static struct trace_event trace_stack_event = {
1000
	.type		= TRACE_STACK,