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gitignore: ignore gcov output files
[linux-2.6/btrfs-unstable.git] / kernel / trace / trace_output.c
blob7938f3ae93e3dbe9d898e037c47027c4908a8d94
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 DEFINE_PER_CPU(struct trace_seq, ftrace_event_seq);
20 EXPORT_PER_CPU_SYMBOL(ftrace_event_seq);
21
22 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
23
24 static int next_event_type = __TRACE_LAST_TYPE + 1;
25
26 void trace_print_seq(struct seq_file *m, struct trace_seq *s)
27 {
28 int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;
29
30 s->buffer[len] = 0;
31 seq_puts(m, s->buffer);
32
33 trace_seq_init(s);
34 }
35
36 enum 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 int ret;
42
43 trace_assign_type(field, entry);
44
45 ret = trace_seq_bprintf(s, field->fmt, field->buf);
46 if (!ret)
47 return TRACE_TYPE_PARTIAL_LINE;
48
49 return TRACE_TYPE_HANDLED;
50 }
51
52 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
53 {
54 struct trace_seq *s = &iter->seq;
55 struct trace_entry *entry = iter->ent;
56 struct print_entry *field;
57 int ret;
58
59 trace_assign_type(field, entry);
60
61 ret = trace_seq_printf(s, "%s", field->buf);
62 if (!ret)
63 return TRACE_TYPE_PARTIAL_LINE;
64
65 return TRACE_TYPE_HANDLED;
66 }
67
68 /**
69 * trace_seq_printf - sequence printing of trace information
70 * @s: trace sequence descriptor
71 * @fmt: printf format string
72 *
73 * The tracer may use either sequence operations or its own
74 * copy to user routines. To simplify formating of a trace
75 * trace_seq_printf is used to store strings into a special
76 * buffer (@s). Then the output may be either used by
77 * the sequencer or pulled into another buffer.
78 */
79 int
80 trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
81 {
82 int len = (PAGE_SIZE - 1) - s->len;
83 va_list ap;
84 int ret;
85
86 if (!len)
87 return 0;
88
89 va_start(ap, fmt);
90 ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
91 va_end(ap);
92
93 /* If we can't write it all, don't bother writing anything */
94 if (ret >= len)
95 return 0;
96
97 s->len += ret;
98
99 return len;
100 }
101 EXPORT_SYMBOL_GPL(trace_seq_printf);
102
103 /**
104 * trace_seq_vprintf - sequence printing of trace information
105 * @s: trace sequence descriptor
106 * @fmt: printf format string
107 *
108 * The tracer may use either sequence operations or its own
109 * copy to user routines. To simplify formating of a trace
110 * trace_seq_printf is used to store strings into a special
111 * buffer (@s). Then the output may be either used by
112 * the sequencer or pulled into another buffer.
113 */
114 int
115 trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
116 {
117 int len = (PAGE_SIZE - 1) - s->len;
118 int ret;
119
120 if (!len)
121 return 0;
122
123 ret = vsnprintf(s->buffer + s->len, len, fmt, args);
124
125 /* If we can't write it all, don't bother writing anything */
126 if (ret >= len)
127 return 0;
128
129 s->len += ret;
130
131 return len;
132 }
133 EXPORT_SYMBOL_GPL(trace_seq_vprintf);
134
135 int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
136 {
137 int len = (PAGE_SIZE - 1) - s->len;
138 int ret;
139
140 if (!len)
141 return 0;
142
143 ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
144
145 /* If we can't write it all, don't bother writing anything */
146 if (ret >= len)
147 return 0;
148
149 s->len += ret;
150
151 return len;
152 }
153
154 /**
155 * trace_seq_puts - trace sequence printing of simple string
156 * @s: trace sequence descriptor
157 * @str: simple string to record
158 *
159 * The tracer may use either the sequence operations or its own
160 * copy to user routines. This function records a simple string
161 * into a special buffer (@s) for later retrieval by a sequencer
162 * or other mechanism.
163 */
164 int trace_seq_puts(struct trace_seq *s, const char *str)
165 {
166 int len = strlen(str);
167
168 if (len > ((PAGE_SIZE - 1) - s->len))
169 return 0;
170
171 memcpy(s->buffer + s->len, str, len);
172 s->len += len;
173
174 return len;
175 }
176
177 int trace_seq_putc(struct trace_seq *s, unsigned char c)
178 {
179 if (s->len >= (PAGE_SIZE - 1))
180 return 0;
181
182 s->buffer[s->len++] = c;
183
184 return 1;
185 }
186
187 int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
188 {
189 if (len > ((PAGE_SIZE - 1) - s->len))
190 return 0;
191
192 memcpy(s->buffer + s->len, mem, len);
193 s->len += len;
194
195 return len;
196 }
197
198 int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
199 {
200 unsigned char hex[HEX_CHARS];
201 const unsigned char *data = mem;
202 int i, j;
203
204 #ifdef __BIG_ENDIAN
205 for (i = 0, j = 0; i < len; i++) {
206 #else
207 for (i = len-1, j = 0; i >= 0; i--) {
208 #endif
209 hex[j++] = hex_asc_hi(data[i]);
210 hex[j++] = hex_asc_lo(data[i]);
211 }
212 hex[j++] = ' ';
213
214 return trace_seq_putmem(s, hex, j);
215 }
216
217 void *trace_seq_reserve(struct trace_seq *s, size_t len)
218 {
219 void *ret;
220
221 if (len > ((PAGE_SIZE - 1) - s->len))
222 return NULL;
223
224 ret = s->buffer + s->len;
225 s->len += len;
226
227 return ret;
228 }
229
230 int trace_seq_path(struct trace_seq *s, struct path *path)
231 {
232 unsigned char *p;
233
234 if (s->len >= (PAGE_SIZE - 1))
235 return 0;
236 p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
237 if (!IS_ERR(p)) {
238 p = mangle_path(s->buffer + s->len, p, "\n");
239 if (p) {
240 s->len = p - s->buffer;
241 return 1;
242 }
243 } else {
244 s->buffer[s->len++] = '?';
245 return 1;
246 }
247
248 return 0;
249 }
250
251 const char *
252 ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
253 unsigned long flags,
254 const struct trace_print_flags *flag_array)
255 {
256 unsigned long mask;
257 const char *str;
258 const char *ret = p->buffer + p->len;
259 int i;
260
261 for (i = 0; flag_array[i].name && flags; i++) {
262
263 mask = flag_array[i].mask;
264 if ((flags & mask) != mask)
265 continue;
266
267 str = flag_array[i].name;
268 flags &= ~mask;
269 if (p->len && delim)
270 trace_seq_puts(p, delim);
271 trace_seq_puts(p, str);
272 }
273
274 /* check for left over flags */
275 if (flags) {
276 if (p->len && delim)
277 trace_seq_puts(p, delim);
278 trace_seq_printf(p, "0x%lx", flags);
279 }
280
281 trace_seq_putc(p, 0);
282
283 return ret;
284 }
285 EXPORT_SYMBOL(ftrace_print_flags_seq);
286
287 const char *
288 ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
289 const struct trace_print_flags *symbol_array)
290 {
291 int i;
292 const char *ret = p->buffer + p->len;
293
294 for (i = 0; symbol_array[i].name; i++) {
295
296 if (val != symbol_array[i].mask)
297 continue;
298
299 trace_seq_puts(p, symbol_array[i].name);
300 break;
301 }
302
303 if (!p->len)
304 trace_seq_printf(p, "0x%lx", val);
305
306 trace_seq_putc(p, 0);
307
308 return ret;
309 }
310 EXPORT_SYMBOL(ftrace_print_symbols_seq);
311
312 #ifdef CONFIG_KRETPROBES
313 static inline const char *kretprobed(const char *name)
314 {
315 static const char tramp_name[] = "kretprobe_trampoline";
316 int size = sizeof(tramp_name);
317
318 if (strncmp(tramp_name, name, size) == 0)
319 return "[unknown/kretprobe'd]";
320 return name;
321 }
322 #else
323 static inline const char *kretprobed(const char *name)
324 {
325 return name;
326 }
327 #endif /* CONFIG_KRETPROBES */
328
329 static int
330 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
331 {
332 #ifdef CONFIG_KALLSYMS
333 char str[KSYM_SYMBOL_LEN];
334 const char *name;
335
336 kallsyms_lookup(address, NULL, NULL, NULL, str);
337
338 name = kretprobed(str);
339
340 return trace_seq_printf(s, fmt, name);
341 #endif
342 return 1;
343 }
344
345 static int
346 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
347 unsigned long address)
348 {
349 #ifdef CONFIG_KALLSYMS
350 char str[KSYM_SYMBOL_LEN];
351 const char *name;
352
353 sprint_symbol(str, address);
354 name = kretprobed(str);
355
356 return trace_seq_printf(s, fmt, name);
357 #endif
358 return 1;
359 }
360
361 #ifndef CONFIG_64BIT
362 # define IP_FMT "%08lx"
363 #else
364 # define IP_FMT "%016lx"
365 #endif
366
367 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
368 unsigned long ip, unsigned long sym_flags)
369 {
370 struct file *file = NULL;
371 unsigned long vmstart = 0;
372 int ret = 1;
373
374 if (mm) {
375 const struct vm_area_struct *vma;
376
377 down_read(&mm->mmap_sem);
378 vma = find_vma(mm, ip);
379 if (vma) {
380 file = vma->vm_file;
381 vmstart = vma->vm_start;
382 }
383 if (file) {
384 ret = trace_seq_path(s, &file->f_path);
385 if (ret)
386 ret = trace_seq_printf(s, "[+0x%lx]",
387 ip - vmstart);
388 }
389 up_read(&mm->mmap_sem);
390 }
391 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
392 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
393 return ret;
394 }
395
396 int
397 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
398 unsigned long sym_flags)
399 {
400 struct mm_struct *mm = NULL;
401 int ret = 1;
402 unsigned int i;
403
404 if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
405 struct task_struct *task;
406 /*
407 * we do the lookup on the thread group leader,
408 * since individual threads might have already quit!
409 */
410 rcu_read_lock();
411 task = find_task_by_vpid(entry->ent.tgid);
412 if (task)
413 mm = get_task_mm(task);
414 rcu_read_unlock();
415 }
416
417 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
418 unsigned long ip = entry->caller[i];
419
420 if (ip == ULONG_MAX || !ret)
421 break;
422 if (ret)
423 ret = trace_seq_puts(s, " => ");
424 if (!ip) {
425 if (ret)
426 ret = trace_seq_puts(s, "??");
427 if (ret)
428 ret = trace_seq_puts(s, "\n");
429 continue;
430 }
431 if (!ret)
432 break;
433 if (ret)
434 ret = seq_print_user_ip(s, mm, ip, sym_flags);
435 ret = trace_seq_puts(s, "\n");
436 }
437
438 if (mm)
439 mmput(mm);
440 return ret;
441 }
442
443 int
444 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
445 {
446 int ret;
447
448 if (!ip)
449 return trace_seq_printf(s, "0");
450
451 if (sym_flags & TRACE_ITER_SYM_OFFSET)
452 ret = seq_print_sym_offset(s, "%s", ip);
453 else
454 ret = seq_print_sym_short(s, "%s", ip);
455
456 if (!ret)
457 return 0;
458
459 if (sym_flags & TRACE_ITER_SYM_ADDR)
460 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
461 return ret;
462 }
463
464 static int
465 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
466 {
467 int hardirq, softirq;
468 char comm[TASK_COMM_LEN];
469
470 trace_find_cmdline(entry->pid, comm);
471 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
472 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
473
474 if (!trace_seq_printf(s, "%8.8s-%-5d %3d%c%c%c",
475 comm, entry->pid, cpu,
476 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
477 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
478 'X' : '.',
479 (entry->flags & TRACE_FLAG_NEED_RESCHED) ?
480 'N' : '.',
481 (hardirq && softirq) ? 'H' :
482 hardirq ? 'h' : softirq ? 's' : '.'))
483 return 0;
484
485 if (entry->preempt_count)
486 return trace_seq_printf(s, "%x", entry->preempt_count);
487 return trace_seq_puts(s, ".");
488 }
489
490 static unsigned long preempt_mark_thresh = 100;
491
492 static int
493 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
494 unsigned long rel_usecs)
495 {
496 return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
497 rel_usecs > preempt_mark_thresh ? '!' :
498 rel_usecs > 1 ? '+' : ' ');
499 }
500
501 int trace_print_context(struct trace_iterator *iter)
502 {
503 struct trace_seq *s = &iter->seq;
504 struct trace_entry *entry = iter->ent;
505 unsigned long long t = ns2usecs(iter->ts);
506 unsigned long usec_rem = do_div(t, USEC_PER_SEC);
507 unsigned long secs = (unsigned long)t;
508 char comm[TASK_COMM_LEN];
509
510 trace_find_cmdline(entry->pid, comm);
511
512 return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
513 comm, entry->pid, iter->cpu, secs, usec_rem);
514 }
515
516 int trace_print_lat_context(struct trace_iterator *iter)
517 {
518 u64 next_ts;
519 int ret;
520 struct trace_seq *s = &iter->seq;
521 struct trace_entry *entry = iter->ent,
522 *next_entry = trace_find_next_entry(iter, NULL,
523 &next_ts);
524 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
525 unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
526 unsigned long rel_usecs;
527
528 if (!next_entry)
529 next_ts = iter->ts;
530 rel_usecs = ns2usecs(next_ts - iter->ts);
531
532 if (verbose) {
533 char comm[TASK_COMM_LEN];
534
535 trace_find_cmdline(entry->pid, comm);
536
537 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
538 " %ld.%03ldms (+%ld.%03ldms): ", comm,
539 entry->pid, iter->cpu, entry->flags,
540 entry->preempt_count, iter->idx,
541 ns2usecs(iter->ts),
542 abs_usecs / USEC_PER_MSEC,
543 abs_usecs % USEC_PER_MSEC,
544 rel_usecs / USEC_PER_MSEC,
545 rel_usecs % USEC_PER_MSEC);
546 } else {
547 ret = lat_print_generic(s, entry, iter->cpu);
548 if (ret)
549 ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
550 }
551
552 return ret;
553 }
554
555 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
556
557 static int task_state_char(unsigned long state)
558 {
559 int bit = state ? __ffs(state) + 1 : 0;
560
561 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
562 }
563
564 /**
565 * ftrace_find_event - find a registered event
566 * @type: the type of event to look for
567 *
568 * Returns an event of type @type otherwise NULL
569 * Called with trace_event_read_lock() held.
570 */
571 struct trace_event *ftrace_find_event(int type)
572 {
573 struct trace_event *event;
574 struct hlist_node *n;
575 unsigned key;
576
577 key = type & (EVENT_HASHSIZE - 1);
578
579 hlist_for_each_entry(event, n, &event_hash[key], node) {
580 if (event->type == type)
581 return event;
582 }
583
584 return NULL;
585 }
586
587 static LIST_HEAD(ftrace_event_list);
588
589 static int trace_search_list(struct list_head **list)
590 {
591 struct trace_event *e;
592 int last = __TRACE_LAST_TYPE;
593
594 if (list_empty(&ftrace_event_list)) {
595 *list = &ftrace_event_list;
596 return last + 1;
597 }
598
599 /*
600 * We used up all possible max events,
601 * lets see if somebody freed one.
602 */
603 list_for_each_entry(e, &ftrace_event_list, list) {
604 if (e->type != last + 1)
605 break;
606 last++;
607 }
608
609 /* Did we used up all 65 thousand events??? */
610 if ((last + 1) > FTRACE_MAX_EVENT)
611 return 0;
612
613 *list = &e->list;
614 return last + 1;
615 }
616
617 void trace_event_read_lock(void)
618 {
619 down_read(&trace_event_mutex);
620 }
621
622 void trace_event_read_unlock(void)
623 {
624 up_read(&trace_event_mutex);
625 }
626
627 /**
628 * register_ftrace_event - register output for an event type
629 * @event: the event type to register
630 *
631 * Event types are stored in a hash and this hash is used to
632 * find a way to print an event. If the @event->type is set
633 * then it will use that type, otherwise it will assign a
634 * type to use.
635 *
636 * If you assign your own type, please make sure it is added
637 * to the trace_type enum in trace.h, to avoid collisions
638 * with the dynamic types.
639 *
640 * Returns the event type number or zero on error.
641 */
642 int register_ftrace_event(struct trace_event *event)
643 {
644 unsigned key;
645 int ret = 0;
646
647 down_write(&trace_event_mutex);
648
649 if (WARN_ON(!event))
650 goto out;
651
652 INIT_LIST_HEAD(&event->list);
653
654 if (!event->type) {
655 struct list_head *list = NULL;
656
657 if (next_event_type > FTRACE_MAX_EVENT) {
658
659 event->type = trace_search_list(&list);
660 if (!event->type)
661 goto out;
662
663 } else {
664
665 event->type = next_event_type++;
666 list = &ftrace_event_list;
667 }
668
669 if (WARN_ON(ftrace_find_event(event->type)))
670 goto out;
671
672 list_add_tail(&event->list, list);
673
674 } else if (event->type > __TRACE_LAST_TYPE) {
675 printk(KERN_WARNING "Need to add type to trace.h\n");
676 WARN_ON(1);
677 goto out;
678 } else {
679 /* Is this event already used */
680 if (ftrace_find_event(event->type))
681 goto out;
682 }
683
684 if (event->trace == NULL)
685 event->trace = trace_nop_print;
686 if (event->raw == NULL)
687 event->raw = trace_nop_print;
688 if (event->hex == NULL)
689 event->hex = trace_nop_print;
690 if (event->binary == NULL)
691 event->binary = trace_nop_print;
692
693 key = event->type & (EVENT_HASHSIZE - 1);
694
695 hlist_add_head(&event->node, &event_hash[key]);
696
697 ret = event->type;
698 out:
699 up_write(&trace_event_mutex);
700
701 return ret;
702 }
703 EXPORT_SYMBOL_GPL(register_ftrace_event);
704
705 /*
706 * Used by module code with the trace_event_mutex held for write.
707 */
708 int __unregister_ftrace_event(struct trace_event *event)
709 {
710 hlist_del(&event->node);
711 list_del(&event->list);
712 return 0;
713 }
714
715 /**
716 * unregister_ftrace_event - remove a no longer used event
717 * @event: the event to remove
718 */
719 int unregister_ftrace_event(struct trace_event *event)
720 {
721 down_write(&trace_event_mutex);
722 __unregister_ftrace_event(event);
723 up_write(&trace_event_mutex);
724
725 return 0;
726 }
727 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
728
729 /*
730 * Standard events
731 */
732
733 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags)
734 {
735 return TRACE_TYPE_HANDLED;
736 }
737
738 /* TRACE_FN */
739 static enum print_line_t trace_fn_trace(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 if (!seq_print_ip_sym(s, field->ip, flags))
747 goto partial;
748
749 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
750 if (!trace_seq_printf(s, " <-"))
751 goto partial;
752 if (!seq_print_ip_sym(s,
753 field->parent_ip,
754 flags))
755 goto partial;
756 }
757 if (!trace_seq_printf(s, "\n"))
758 goto partial;
759
760 return TRACE_TYPE_HANDLED;
761
762 partial:
763 return TRACE_TYPE_PARTIAL_LINE;
764 }
765
766 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags)
767 {
768 struct ftrace_entry *field;
769
770 trace_assign_type(field, iter->ent);
771
772 if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
773 field->ip,
774 field->parent_ip))
775 return TRACE_TYPE_PARTIAL_LINE;
776
777 return TRACE_TYPE_HANDLED;
778 }
779
780 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags)
781 {
782 struct ftrace_entry *field;
783 struct trace_seq *s = &iter->seq;
784
785 trace_assign_type(field, iter->ent);
786
787 SEQ_PUT_HEX_FIELD_RET(s, field->ip);
788 SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
789
790 return TRACE_TYPE_HANDLED;
791 }
792
793 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags)
794 {
795 struct ftrace_entry *field;
796 struct trace_seq *s = &iter->seq;
797
798 trace_assign_type(field, iter->ent);
799
800 SEQ_PUT_FIELD_RET(s, field->ip);
801 SEQ_PUT_FIELD_RET(s, field->parent_ip);
802
803 return TRACE_TYPE_HANDLED;
804 }
805
806 static struct trace_event trace_fn_event = {
807 .type = TRACE_FN,
808 .trace = trace_fn_trace,
809 .raw = trace_fn_raw,
810 .hex = trace_fn_hex,
811 .binary = trace_fn_bin,
812 };
813
814 /* TRACE_CTX an TRACE_WAKE */
815 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
816 char *delim)
817 {
818 struct ctx_switch_entry *field;
819 char comm[TASK_COMM_LEN];
820 int S, T;
821
822
823 trace_assign_type(field, iter->ent);
824
825 T = task_state_char(field->next_state);
826 S = task_state_char(field->prev_state);
827 trace_find_cmdline(field->next_pid, comm);
828 if (!trace_seq_printf(&iter->seq,
829 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
830 field->prev_pid,
831 field->prev_prio,
832 S, delim,
833 field->next_cpu,
834 field->next_pid,
835 field->next_prio,
836 T, comm))
837 return TRACE_TYPE_PARTIAL_LINE;
838
839 return TRACE_TYPE_HANDLED;
840 }
841
842 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags)
843 {
844 return trace_ctxwake_print(iter, "==>");
845 }
846
847 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
848 int flags)
849 {
850 return trace_ctxwake_print(iter, " +");
851 }
852
853 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
854 {
855 struct ctx_switch_entry *field;
856 int T;
857
858 trace_assign_type(field, iter->ent);
859
860 if (!S)
861 task_state_char(field->prev_state);
862 T = task_state_char(field->next_state);
863 if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
864 field->prev_pid,
865 field->prev_prio,
866 S,
867 field->next_cpu,
868 field->next_pid,
869 field->next_prio,
870 T))
871 return TRACE_TYPE_PARTIAL_LINE;
872
873 return TRACE_TYPE_HANDLED;
874 }
875
876 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags)
877 {
878 return trace_ctxwake_raw(iter, 0);
879 }
880
881 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags)
882 {
883 return trace_ctxwake_raw(iter, '+');
884 }
885
886
887 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
888 {
889 struct ctx_switch_entry *field;
890 struct trace_seq *s = &iter->seq;
891 int T;
892
893 trace_assign_type(field, iter->ent);
894
895 if (!S)
896 task_state_char(field->prev_state);
897 T = task_state_char(field->next_state);
898
899 SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
900 SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
901 SEQ_PUT_HEX_FIELD_RET(s, S);
902 SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
903 SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
904 SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
905 SEQ_PUT_HEX_FIELD_RET(s, T);
906
907 return TRACE_TYPE_HANDLED;
908 }
909
910 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags)
911 {
912 return trace_ctxwake_hex(iter, 0);
913 }
914
915 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags)
916 {
917 return trace_ctxwake_hex(iter, '+');
918 }
919
920 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
921 int flags)
922 {
923 struct ctx_switch_entry *field;
924 struct trace_seq *s = &iter->seq;
925
926 trace_assign_type(field, iter->ent);
927
928 SEQ_PUT_FIELD_RET(s, field->prev_pid);
929 SEQ_PUT_FIELD_RET(s, field->prev_prio);
930 SEQ_PUT_FIELD_RET(s, field->prev_state);
931 SEQ_PUT_FIELD_RET(s, field->next_pid);
932 SEQ_PUT_FIELD_RET(s, field->next_prio);
933 SEQ_PUT_FIELD_RET(s, field->next_state);
934
935 return TRACE_TYPE_HANDLED;
936 }
937
938 static struct trace_event trace_ctx_event = {
939 .type = TRACE_CTX,
940 .trace = trace_ctx_print,
941 .raw = trace_ctx_raw,
942 .hex = trace_ctx_hex,
943 .binary = trace_ctxwake_bin,
944 };
945
946 static struct trace_event trace_wake_event = {
947 .type = TRACE_WAKE,
948 .trace = trace_wake_print,
949 .raw = trace_wake_raw,
950 .hex = trace_wake_hex,
951 .binary = trace_ctxwake_bin,
952 };
953
954 /* TRACE_SPECIAL */
955 static enum print_line_t trace_special_print(struct trace_iterator *iter,
956 int flags)
957 {
958 struct special_entry *field;
959
960 trace_assign_type(field, iter->ent);
961
962 if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
963 field->arg1,
964 field->arg2,
965 field->arg3))
966 return TRACE_TYPE_PARTIAL_LINE;
967
968 return TRACE_TYPE_HANDLED;
969 }
970
971 static enum print_line_t trace_special_hex(struct trace_iterator *iter,
972 int flags)
973 {
974 struct special_entry *field;
975 struct trace_seq *s = &iter->seq;
976
977 trace_assign_type(field, iter->ent);
978
979 SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
980 SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
981 SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
982
983 return TRACE_TYPE_HANDLED;
984 }
985
986 static enum print_line_t trace_special_bin(struct trace_iterator *iter,
987 int flags)
988 {
989 struct special_entry *field;
990 struct trace_seq *s = &iter->seq;
991
992 trace_assign_type(field, iter->ent);
993
994 SEQ_PUT_FIELD_RET(s, field->arg1);
995 SEQ_PUT_FIELD_RET(s, field->arg2);
996 SEQ_PUT_FIELD_RET(s, field->arg3);
997
998 return TRACE_TYPE_HANDLED;
999 }
1000
1001 static struct trace_event trace_special_event = {
1002 .type = TRACE_SPECIAL,
1003 .trace = trace_special_print,
1004 .raw = trace_special_print,
1005 .hex = trace_special_hex,
1006 .binary = trace_special_bin,
1007 };
1008
1009 /* TRACE_STACK */
1010
1011 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1012 int flags)
1013 {
1014 struct stack_entry *field;
1015 struct trace_seq *s = &iter->seq;
1016 int i;
1017
1018 trace_assign_type(field, iter->ent);
1019
1020 if (!trace_seq_puts(s, "<stack trace>\n"))
1021 goto partial;
1022 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1023 if (!field->caller[i] || (field->caller[i] == ULONG_MAX))
1024 break;
1025 if (!trace_seq_puts(s, " => "))
1026 goto partial;
1027
1028 if (!seq_print_ip_sym(s, field->caller[i], flags))
1029 goto partial;
1030 if (!trace_seq_puts(s, "\n"))
1031 goto partial;
1032 }
1033
1034 return TRACE_TYPE_HANDLED;
1035
1036 partial:
1037 return TRACE_TYPE_PARTIAL_LINE;
1038 }
1039
1040 static struct trace_event trace_stack_event = {
1041 .type = TRACE_STACK,
1042 .trace = trace_stack_print,
1043 .raw = trace_special_print,
1044 .hex = trace_special_hex,
1045 .binary = trace_special_bin,
1046 };
1047
1048 /* TRACE_USER_STACK */
1049 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1050 int flags)
1051 {
1052 struct userstack_entry *field;
1053 struct trace_seq *s = &iter->seq;
1054
1055 trace_assign_type(field, iter->ent);
1056
1057 if (!trace_seq_puts(s, "<user stack trace>\n"))
1058 goto partial;
1059
1060 if (!seq_print_userip_objs(field, s, flags))
1061 goto partial;
1062
1063 return TRACE_TYPE_HANDLED;
1064
1065 partial:
1066 return TRACE_TYPE_PARTIAL_LINE;
1067 }
1068
1069 static struct trace_event trace_user_stack_event = {
1070 .type = TRACE_USER_STACK,
1071 .trace = trace_user_stack_print,
1072 .raw = trace_special_print,
1073 .hex = trace_special_hex,
1074 .binary = trace_special_bin,
1075 };
1076
1077 /* TRACE_BPRINT */
1078 static enum print_line_t
1079 trace_bprint_print(struct trace_iterator *iter, int flags)
1080 {
1081 struct trace_entry *entry = iter->ent;
1082 struct trace_seq *s = &iter->seq;
1083 struct bprint_entry *field;
1084
1085 trace_assign_type(field, entry);
1086
1087 if (!seq_print_ip_sym(s, field->ip, flags))
1088 goto partial;
1089
1090 if (!trace_seq_puts(s, ": "))
1091 goto partial;
1092
1093 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1094 goto partial;
1095
1096 return TRACE_TYPE_HANDLED;
1097
1098 partial:
1099 return TRACE_TYPE_PARTIAL_LINE;
1100 }
1101
1102
1103 static enum print_line_t
1104 trace_bprint_raw(struct trace_iterator *iter, int flags)
1105 {
1106 struct bprint_entry *field;
1107 struct trace_seq *s = &iter->seq;
1108
1109 trace_assign_type(field, iter->ent);
1110
1111 if (!trace_seq_printf(s, ": %lx : ", field->ip))
1112 goto partial;
1113
1114 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1115 goto partial;
1116
1117 return TRACE_TYPE_HANDLED;
1118
1119 partial:
1120 return TRACE_TYPE_PARTIAL_LINE;
1121 }
1122
1123
1124 static struct trace_event trace_bprint_event = {
1125 .type = TRACE_BPRINT,
1126 .trace = trace_bprint_print,
1127 .raw = trace_bprint_raw,
1128 };
1129
1130 /* TRACE_PRINT */
1131 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1132 int flags)
1133 {
1134 struct print_entry *field;
1135 struct trace_seq *s = &iter->seq;
1136
1137 trace_assign_type(field, iter->ent);
1138
1139 if (!seq_print_ip_sym(s, field->ip, flags))
1140 goto partial;
1141
1142 if (!trace_seq_printf(s, ": %s", field->buf))
1143 goto partial;
1144
1145 return TRACE_TYPE_HANDLED;
1146
1147 partial:
1148 return TRACE_TYPE_PARTIAL_LINE;
1149 }
1150
1151 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
1152 {
1153 struct print_entry *field;
1154
1155 trace_assign_type(field, iter->ent);
1156
1157 if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1158 goto partial;
1159
1160 return TRACE_TYPE_HANDLED;
1161
1162 partial:
1163 return TRACE_TYPE_PARTIAL_LINE;
1164 }
1165
1166 static struct trace_event trace_print_event = {
1167 .type = TRACE_PRINT,
1168 .trace = trace_print_print,
1169 .raw = trace_print_raw,
1170 };
1171
1172
1173 static struct trace_event *events[] __initdata = {
1174 &trace_fn_event,
1175 &trace_ctx_event,
1176 &trace_wake_event,
1177 &trace_special_event,
1178 &trace_stack_event,
1179 &trace_user_stack_event,
1180 &trace_bprint_event,
1181 &trace_print_event,
1182 NULL
1183 };
1184
1185 __init static int init_events(void)
1186 {
1187 struct trace_event *event;
1188 int i, ret;
1189
1190 for (i = 0; events[i]; i++) {
1191 event = events[i];
1192
1193 ret = register_ftrace_event(event);
1194 if (!ret) {
1195 printk(KERN_WARNING "event %d failed to register\n",
1196 event->type);
1197 WARN_ON_ONCE(1);
1198 }
1199 }
1200
1201 return 0;
1202 }
1203 device_initcall(init_events);
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