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