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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc
[linux-2.6/linux-2.6-stable.git] / kernel / trace / trace_output.c
blob51999309a6cf5d71347da29c3406e45f1b1e98d0
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
17 DECLARE_RWSEM(trace_event_mutex);
18
19 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
20
21 static int next_event_type = __TRACE_LAST_TYPE + 1;
22
23 int 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
40 enum 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
56 enum 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 */
86 int
87 trace_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 }
110 EXPORT_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 */
123 int
124 trace_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 }
144 EXPORT_SYMBOL_GPL(trace_seq_vprintf);
145
146 int 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 */
177 int 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
195 int 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 }
209 EXPORT_SYMBOL(trace_seq_putc);
210
211 int 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
227 int 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
249 void *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
267 int 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
295 const char *
296 ftrace_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 }
329 EXPORT_SYMBOL(ftrace_print_flags_seq);
330
331 const char *
332 ftrace_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 }
354 EXPORT_SYMBOL(ftrace_print_symbols_seq);
355
356 #if BITS_PER_LONG == 32
357 const char *
358 ftrace_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 }
380 EXPORT_SYMBOL(ftrace_print_symbols_seq_u64);
381 #endif
382
383 const char *
384 ftrace_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 }
396 EXPORT_SYMBOL(ftrace_print_hex_seq);
397
398 #ifdef CONFIG_KRETPROBES
399 static 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
409 static inline const char *kretprobed(const char *name)
410 {
411 return name;
412 }
413 #endif /* CONFIG_KRETPROBES */
414
415 static int
416 seq_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
431 static int
432 seq_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
453 int 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
485 int
486 seq_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
532 int
533 seq_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 */
561 int 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
597 static int
598 lat_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
611 static unsigned long preempt_mark_thresh = 100;
612
613 static int
614 lat_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
622 int 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
637 int 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
676 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
677
678 static 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 */
692 struct 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
708 static LIST_HEAD(ftrace_event_list);
709
710 static 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
738 void trace_event_read_lock(void)
739 {
740 down_read(&trace_event_mutex);
741 }
742
743 void 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 */
763 int 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 }
827 EXPORT_SYMBOL_GPL(register_ftrace_event);
828
829 /*
830 * Used by module code with the trace_event_mutex held for write.
831 */
832 int __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 */
843 int 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 }
851 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
852
853 /*
854 * Standard events
855 */
856
857 enum 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 */
867 static 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
895 static 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
910 static 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
924 static 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
938 static 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
945 static struct trace_event trace_fn_event = {
946 .type = TRACE_FN,
947 .funcs = &trace_fn_funcs,
948 };
949
950 /* TRACE_CTX an TRACE_WAKE */
951 static 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
978 static 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
984 static 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
990 static 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
1013 static 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
1019 static 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
1026 static 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
1049 static 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
1055 static 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
1061 static 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
1079 static 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
1086 static struct trace_event trace_ctx_event = {
1087 .type = TRACE_CTX,
1088 .funcs = &trace_ctx_funcs,
1089 };
1090
1091 static 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
1098 static struct trace_event trace_wake_event = {
1099 .type = TRACE_WAKE,
1100 .funcs = &trace_wake_funcs,
1101 };
1102
1103 /* TRACE_STACK */
1104
1105 static 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
1135 static struct trace_event_functions trace_stack_funcs = {
1136 .trace = trace_stack_print,
1137 };
1138
1139 static struct trace_event trace_stack_event = {
1140 .type = TRACE_STACK,
1141 .funcs = &trace_stack_funcs,
1142 };
1143
1144 /* TRACE_USER_STACK */
1145 static 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
1165 static struct trace_event_functions trace_user_stack_funcs = {
1166 .trace = trace_user_stack_print,
1167 };
1168
1169 static struct trace_event trace_user_stack_event = {
1170 .type = TRACE_USER_STACK,
1171 .funcs = &trace_user_stack_funcs,
1172 };
1173
1174 /* TRACE_BPRINT */
1175 static enum print_line_t
1176 trace_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
1201 static enum print_line_t
1202 trace_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
1222 static struct trace_event_functions trace_bprint_funcs = {
1223 .trace = trace_bprint_print,
1224 .raw = trace_bprint_raw,
1225 };
1226
1227 static struct trace_event trace_bprint_event = {
1228 .type = TRACE_BPRINT,
1229 .funcs = &trace_bprint_funcs,
1230 };
1231
1232 /* TRACE_PRINT */
1233 static 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
1253 static 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
1269 static struct trace_event_functions trace_print_funcs = {
1270 .trace = trace_print_print,
1271 .raw = trace_print_raw,
1272 };
1273
1274 static struct trace_event trace_print_event = {
1275 .type = TRACE_PRINT,
1276 .funcs = &trace_print_funcs,
1277 };
1278
1279
1280 static 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 }
1309 device_initcall(init_events);
Linux kernel 2.6 stable trees (mirror)