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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
[linux-2.6/linux-2.6-openrd.git] / kernel / trace / trace_output.c
blobed17565826b0d82b00029a145cac7c2d75488adf
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 seq_write(m, s->buffer, len);
31
32 trace_seq_init(s);
33 }
34
35 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
36 {
37 struct trace_seq *s = &iter->seq;
38 struct trace_entry *entry = iter->ent;
39 struct bprint_entry *field;
40 int ret;
41
42 trace_assign_type(field, entry);
43
44 ret = trace_seq_bprintf(s, field->fmt, field->buf);
45 if (!ret)
46 return TRACE_TYPE_PARTIAL_LINE;
47
48 return TRACE_TYPE_HANDLED;
49 }
50
51 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
52 {
53 struct trace_seq *s = &iter->seq;
54 struct trace_entry *entry = iter->ent;
55 struct print_entry *field;
56 int ret;
57
58 trace_assign_type(field, entry);
59
60 ret = trace_seq_printf(s, "%s", field->buf);
61 if (!ret)
62 return TRACE_TYPE_PARTIAL_LINE;
63
64 return TRACE_TYPE_HANDLED;
65 }
66
67 /**
68 * trace_seq_printf - sequence printing of trace information
69 * @s: trace sequence descriptor
70 * @fmt: printf format string
71 *
72 * The tracer may use either sequence operations or its own
73 * copy to user routines. To simplify formating of a trace
74 * trace_seq_printf is used to store strings into a special
75 * buffer (@s). Then the output may be either used by
76 * the sequencer or pulled into another buffer.
77 */
78 int
79 trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
80 {
81 int len = (PAGE_SIZE - 1) - s->len;
82 va_list ap;
83 int ret;
84
85 if (!len)
86 return 0;
87
88 va_start(ap, fmt);
89 ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
90 va_end(ap);
91
92 /* If we can't write it all, don't bother writing anything */
93 if (ret >= len)
94 return 0;
95
96 s->len += ret;
97
98 return len;
99 }
100 EXPORT_SYMBOL_GPL(trace_seq_printf);
101
102 /**
103 * trace_seq_vprintf - sequence printing of trace information
104 * @s: trace sequence descriptor
105 * @fmt: printf format string
106 *
107 * The tracer may use either sequence operations or its own
108 * copy to user routines. To simplify formating of a trace
109 * trace_seq_printf is used to store strings into a special
110 * buffer (@s). Then the output may be either used by
111 * the sequencer or pulled into another buffer.
112 */
113 int
114 trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
115 {
116 int len = (PAGE_SIZE - 1) - s->len;
117 int ret;
118
119 if (!len)
120 return 0;
121
122 ret = vsnprintf(s->buffer + s->len, len, fmt, args);
123
124 /* If we can't write it all, don't bother writing anything */
125 if (ret >= len)
126 return 0;
127
128 s->len += ret;
129
130 return len;
131 }
132 EXPORT_SYMBOL_GPL(trace_seq_vprintf);
133
134 int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
135 {
136 int len = (PAGE_SIZE - 1) - s->len;
137 int ret;
138
139 if (!len)
140 return 0;
141
142 ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
143
144 /* If we can't write it all, don't bother writing anything */
145 if (ret >= len)
146 return 0;
147
148 s->len += ret;
149
150 return len;
151 }
152
153 /**
154 * trace_seq_puts - trace sequence printing of simple string
155 * @s: trace sequence descriptor
156 * @str: simple string to record
157 *
158 * The tracer may use either the sequence operations or its own
159 * copy to user routines. This function records a simple string
160 * into a special buffer (@s) for later retrieval by a sequencer
161 * or other mechanism.
162 */
163 int trace_seq_puts(struct trace_seq *s, const char *str)
164 {
165 int len = strlen(str);
166
167 if (len > ((PAGE_SIZE - 1) - s->len))
168 return 0;
169
170 memcpy(s->buffer + s->len, str, len);
171 s->len += len;
172
173 return len;
174 }
175
176 int trace_seq_putc(struct trace_seq *s, unsigned char c)
177 {
178 if (s->len >= (PAGE_SIZE - 1))
179 return 0;
180
181 s->buffer[s->len++] = c;
182
183 return 1;
184 }
185
186 int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
187 {
188 if (len > ((PAGE_SIZE - 1) - s->len))
189 return 0;
190
191 memcpy(s->buffer + s->len, mem, len);
192 s->len += len;
193
194 return len;
195 }
196
197 int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
198 {
199 unsigned char hex[HEX_CHARS];
200 const unsigned char *data = mem;
201 int i, j;
202
203 #ifdef __BIG_ENDIAN
204 for (i = 0, j = 0; i < len; i++) {
205 #else
206 for (i = len-1, j = 0; i >= 0; i--) {
207 #endif
208 hex[j++] = hex_asc_hi(data[i]);
209 hex[j++] = hex_asc_lo(data[i]);
210 }
211 hex[j++] = ' ';
212
213 return trace_seq_putmem(s, hex, j);
214 }
215
216 void *trace_seq_reserve(struct trace_seq *s, size_t len)
217 {
218 void *ret;
219
220 if (len > ((PAGE_SIZE - 1) - s->len))
221 return NULL;
222
223 ret = s->buffer + s->len;
224 s->len += len;
225
226 return ret;
227 }
228
229 int trace_seq_path(struct trace_seq *s, struct path *path)
230 {
231 unsigned char *p;
232
233 if (s->len >= (PAGE_SIZE - 1))
234 return 0;
235 p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
236 if (!IS_ERR(p)) {
237 p = mangle_path(s->buffer + s->len, p, "\n");
238 if (p) {
239 s->len = p - s->buffer;
240 return 1;
241 }
242 } else {
243 s->buffer[s->len++] = '?';
244 return 1;
245 }
246
247 return 0;
248 }
249
250 const char *
251 ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
252 unsigned long flags,
253 const struct trace_print_flags *flag_array)
254 {
255 unsigned long mask;
256 const char *str;
257 const char *ret = p->buffer + p->len;
258 int i;
259
260 for (i = 0; flag_array[i].name && flags; i++) {
261
262 mask = flag_array[i].mask;
263 if ((flags & mask) != mask)
264 continue;
265
266 str = flag_array[i].name;
267 flags &= ~mask;
268 if (p->len && delim)
269 trace_seq_puts(p, delim);
270 trace_seq_puts(p, str);
271 }
272
273 /* check for left over flags */
274 if (flags) {
275 if (p->len && delim)
276 trace_seq_puts(p, delim);
277 trace_seq_printf(p, "0x%lx", flags);
278 }
279
280 trace_seq_putc(p, 0);
281
282 return ret;
283 }
284 EXPORT_SYMBOL(ftrace_print_flags_seq);
285
286 const char *
287 ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
288 const struct trace_print_flags *symbol_array)
289 {
290 int i;
291 const char *ret = p->buffer + p->len;
292
293 for (i = 0; symbol_array[i].name; i++) {
294
295 if (val != symbol_array[i].mask)
296 continue;
297
298 trace_seq_puts(p, symbol_array[i].name);
299 break;
300 }
301
302 if (!p->len)
303 trace_seq_printf(p, "0x%lx", val);
304
305 trace_seq_putc(p, 0);
306
307 return ret;
308 }
309 EXPORT_SYMBOL(ftrace_print_symbols_seq);
310
311 #ifdef CONFIG_KRETPROBES
312 static inline const char *kretprobed(const char *name)
313 {
314 static const char tramp_name[] = "kretprobe_trampoline";
315 int size = sizeof(tramp_name);
316
317 if (strncmp(tramp_name, name, size) == 0)
318 return "[unknown/kretprobe'd]";
319 return name;
320 }
321 #else
322 static inline const char *kretprobed(const char *name)
323 {
324 return name;
325 }
326 #endif /* CONFIG_KRETPROBES */
327
328 static int
329 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
330 {
331 #ifdef CONFIG_KALLSYMS
332 char str[KSYM_SYMBOL_LEN];
333 const char *name;
334
335 kallsyms_lookup(address, NULL, NULL, NULL, str);
336
337 name = kretprobed(str);
338
339 return trace_seq_printf(s, fmt, name);
340 #endif
341 return 1;
342 }
343
344 static int
345 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
346 unsigned long address)
347 {
348 #ifdef CONFIG_KALLSYMS
349 char str[KSYM_SYMBOL_LEN];
350 const char *name;
351
352 sprint_symbol(str, address);
353 name = kretprobed(str);
354
355 return trace_seq_printf(s, fmt, name);
356 #endif
357 return 1;
358 }
359
360 #ifndef CONFIG_64BIT
361 # define IP_FMT "%08lx"
362 #else
363 # define IP_FMT "%016lx"
364 #endif
365
366 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
367 unsigned long ip, unsigned long sym_flags)
368 {
369 struct file *file = NULL;
370 unsigned long vmstart = 0;
371 int ret = 1;
372
373 if (mm) {
374 const struct vm_area_struct *vma;
375
376 down_read(&mm->mmap_sem);
377 vma = find_vma(mm, ip);
378 if (vma) {
379 file = vma->vm_file;
380 vmstart = vma->vm_start;
381 }
382 if (file) {
383 ret = trace_seq_path(s, &file->f_path);
384 if (ret)
385 ret = trace_seq_printf(s, "[+0x%lx]",
386 ip - vmstart);
387 }
388 up_read(&mm->mmap_sem);
389 }
390 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
391 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
392 return ret;
393 }
394
395 int
396 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
397 unsigned long sym_flags)
398 {
399 struct mm_struct *mm = NULL;
400 int ret = 1;
401 unsigned int i;
402
403 if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
404 struct task_struct *task;
405 /*
406 * we do the lookup on the thread group leader,
407 * since individual threads might have already quit!
408 */
409 rcu_read_lock();
410 task = find_task_by_vpid(entry->tgid);
411 if (task)
412 mm = get_task_mm(task);
413 rcu_read_unlock();
414 }
415
416 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
417 unsigned long ip = entry->caller[i];
418
419 if (ip == ULONG_MAX || !ret)
420 break;
421 if (ret)
422 ret = trace_seq_puts(s, " => ");
423 if (!ip) {
424 if (ret)
425 ret = trace_seq_puts(s, "??");
426 if (ret)
427 ret = trace_seq_puts(s, "\n");
428 continue;
429 }
430 if (!ret)
431 break;
432 if (ret)
433 ret = seq_print_user_ip(s, mm, ip, sym_flags);
434 ret = trace_seq_puts(s, "\n");
435 }
436
437 if (mm)
438 mmput(mm);
439 return ret;
440 }
441
442 int
443 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
444 {
445 int ret;
446
447 if (!ip)
448 return trace_seq_printf(s, "0");
449
450 if (sym_flags & TRACE_ITER_SYM_OFFSET)
451 ret = seq_print_sym_offset(s, "%s", ip);
452 else
453 ret = seq_print_sym_short(s, "%s", ip);
454
455 if (!ret)
456 return 0;
457
458 if (sym_flags & TRACE_ITER_SYM_ADDR)
459 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
460 return ret;
461 }
462
463 /**
464 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
465 * @s: trace seq struct to write to
466 * @entry: The trace entry field from the ring buffer
467 *
468 * Prints the generic fields of irqs off, in hard or softirq, preempt
469 * count and lock depth.
470 */
471 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
472 {
473 int hardirq, softirq;
474 int ret;
475
476 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
477 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
478
479 if (!trace_seq_printf(s, "%c%c%c",
480 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
481 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
482 'X' : '.',
483 (entry->flags & TRACE_FLAG_NEED_RESCHED) ?
484 'N' : '.',
485 (hardirq && softirq) ? 'H' :
486 hardirq ? 'h' : softirq ? 's' : '.'))
487 return 0;
488
489 if (entry->preempt_count)
490 ret = trace_seq_printf(s, "%x", entry->preempt_count);
491 else
492 ret = trace_seq_putc(s, '.');
493
494 if (!ret)
495 return 0;
496
497 if (entry->lock_depth < 0)
498 return trace_seq_putc(s, '.');
499
500 return trace_seq_printf(s, "%d", entry->lock_depth);
501 }
502
503 static int
504 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
505 {
506 char comm[TASK_COMM_LEN];
507
508 trace_find_cmdline(entry->pid, comm);
509
510 if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
511 comm, entry->pid, cpu))
512 return 0;
513
514 return trace_print_lat_fmt(s, entry);
515 }
516
517 static unsigned long preempt_mark_thresh = 100;
518
519 static int
520 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
521 unsigned long rel_usecs)
522 {
523 return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
524 rel_usecs > preempt_mark_thresh ? '!' :
525 rel_usecs > 1 ? '+' : ' ');
526 }
527
528 int trace_print_context(struct trace_iterator *iter)
529 {
530 struct trace_seq *s = &iter->seq;
531 struct trace_entry *entry = iter->ent;
532 unsigned long long t = ns2usecs(iter->ts);
533 unsigned long usec_rem = do_div(t, USEC_PER_SEC);
534 unsigned long secs = (unsigned long)t;
535 char comm[TASK_COMM_LEN];
536
537 trace_find_cmdline(entry->pid, comm);
538
539 return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
540 comm, entry->pid, iter->cpu, secs, usec_rem);
541 }
542
543 int trace_print_lat_context(struct trace_iterator *iter)
544 {
545 u64 next_ts;
546 int ret;
547 struct trace_seq *s = &iter->seq;
548 struct trace_entry *entry = iter->ent,
549 *next_entry = trace_find_next_entry(iter, NULL,
550 &next_ts);
551 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
552 unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
553 unsigned long rel_usecs;
554
555 if (!next_entry)
556 next_ts = iter->ts;
557 rel_usecs = ns2usecs(next_ts - iter->ts);
558
559 if (verbose) {
560 char comm[TASK_COMM_LEN];
561
562 trace_find_cmdline(entry->pid, comm);
563
564 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
565 " %ld.%03ldms (+%ld.%03ldms): ", comm,
566 entry->pid, iter->cpu, entry->flags,
567 entry->preempt_count, iter->idx,
568 ns2usecs(iter->ts),
569 abs_usecs / USEC_PER_MSEC,
570 abs_usecs % USEC_PER_MSEC,
571 rel_usecs / USEC_PER_MSEC,
572 rel_usecs % USEC_PER_MSEC);
573 } else {
574 ret = lat_print_generic(s, entry, iter->cpu);
575 if (ret)
576 ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
577 }
578
579 return ret;
580 }
581
582 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
583
584 static int task_state_char(unsigned long state)
585 {
586 int bit = state ? __ffs(state) + 1 : 0;
587
588 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
589 }
590
591 /**
592 * ftrace_find_event - find a registered event
593 * @type: the type of event to look for
594 *
595 * Returns an event of type @type otherwise NULL
596 * Called with trace_event_read_lock() held.
597 */
598 struct trace_event *ftrace_find_event(int type)
599 {
600 struct trace_event *event;
601 struct hlist_node *n;
602 unsigned key;
603
604 key = type & (EVENT_HASHSIZE - 1);
605
606 hlist_for_each_entry(event, n, &event_hash[key], node) {
607 if (event->type == type)
608 return event;
609 }
610
611 return NULL;
612 }
613
614 static LIST_HEAD(ftrace_event_list);
615
616 static int trace_search_list(struct list_head **list)
617 {
618 struct trace_event *e;
619 int last = __TRACE_LAST_TYPE;
620
621 if (list_empty(&ftrace_event_list)) {
622 *list = &ftrace_event_list;
623 return last + 1;
624 }
625
626 /*
627 * We used up all possible max events,
628 * lets see if somebody freed one.
629 */
630 list_for_each_entry(e, &ftrace_event_list, list) {
631 if (e->type != last + 1)
632 break;
633 last++;
634 }
635
636 /* Did we used up all 65 thousand events??? */
637 if ((last + 1) > FTRACE_MAX_EVENT)
638 return 0;
639
640 *list = &e->list;
641 return last + 1;
642 }
643
644 void trace_event_read_lock(void)
645 {
646 down_read(&trace_event_mutex);
647 }
648
649 void trace_event_read_unlock(void)
650 {
651 up_read(&trace_event_mutex);
652 }
653
654 /**
655 * register_ftrace_event - register output for an event type
656 * @event: the event type to register
657 *
658 * Event types are stored in a hash and this hash is used to
659 * find a way to print an event. If the @event->type is set
660 * then it will use that type, otherwise it will assign a
661 * type to use.
662 *
663 * If you assign your own type, please make sure it is added
664 * to the trace_type enum in trace.h, to avoid collisions
665 * with the dynamic types.
666 *
667 * Returns the event type number or zero on error.
668 */
669 int register_ftrace_event(struct trace_event *event)
670 {
671 unsigned key;
672 int ret = 0;
673
674 down_write(&trace_event_mutex);
675
676 if (WARN_ON(!event))
677 goto out;
678
679 INIT_LIST_HEAD(&event->list);
680
681 if (!event->type) {
682 struct list_head *list = NULL;
683
684 if (next_event_type > FTRACE_MAX_EVENT) {
685
686 event->type = trace_search_list(&list);
687 if (!event->type)
688 goto out;
689
690 } else {
691
692 event->type = next_event_type++;
693 list = &ftrace_event_list;
694 }
695
696 if (WARN_ON(ftrace_find_event(event->type)))
697 goto out;
698
699 list_add_tail(&event->list, list);
700
701 } else if (event->type > __TRACE_LAST_TYPE) {
702 printk(KERN_WARNING "Need to add type to trace.h\n");
703 WARN_ON(1);
704 goto out;
705 } else {
706 /* Is this event already used */
707 if (ftrace_find_event(event->type))
708 goto out;
709 }
710
711 if (event->trace == NULL)
712 event->trace = trace_nop_print;
713 if (event->raw == NULL)
714 event->raw = trace_nop_print;
715 if (event->hex == NULL)
716 event->hex = trace_nop_print;
717 if (event->binary == NULL)
718 event->binary = trace_nop_print;
719
720 key = event->type & (EVENT_HASHSIZE - 1);
721
722 hlist_add_head(&event->node, &event_hash[key]);
723
724 ret = event->type;
725 out:
726 up_write(&trace_event_mutex);
727
728 return ret;
729 }
730 EXPORT_SYMBOL_GPL(register_ftrace_event);
731
732 /*
733 * Used by module code with the trace_event_mutex held for write.
734 */
735 int __unregister_ftrace_event(struct trace_event *event)
736 {
737 hlist_del(&event->node);
738 list_del(&event->list);
739 return 0;
740 }
741
742 /**
743 * unregister_ftrace_event - remove a no longer used event
744 * @event: the event to remove
745 */
746 int unregister_ftrace_event(struct trace_event *event)
747 {
748 down_write(&trace_event_mutex);
749 __unregister_ftrace_event(event);
750 up_write(&trace_event_mutex);
751
752 return 0;
753 }
754 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
755
756 /*
757 * Standard events
758 */
759
760 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags)
761 {
762 return TRACE_TYPE_HANDLED;
763 }
764
765 /* TRACE_FN */
766 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags)
767 {
768 struct ftrace_entry *field;
769 struct trace_seq *s = &iter->seq;
770
771 trace_assign_type(field, iter->ent);
772
773 if (!seq_print_ip_sym(s, field->ip, flags))
774 goto partial;
775
776 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
777 if (!trace_seq_printf(s, " <-"))
778 goto partial;
779 if (!seq_print_ip_sym(s,
780 field->parent_ip,
781 flags))
782 goto partial;
783 }
784 if (!trace_seq_printf(s, "\n"))
785 goto partial;
786
787 return TRACE_TYPE_HANDLED;
788
789 partial:
790 return TRACE_TYPE_PARTIAL_LINE;
791 }
792
793 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags)
794 {
795 struct ftrace_entry *field;
796
797 trace_assign_type(field, iter->ent);
798
799 if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
800 field->ip,
801 field->parent_ip))
802 return TRACE_TYPE_PARTIAL_LINE;
803
804 return TRACE_TYPE_HANDLED;
805 }
806
807 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags)
808 {
809 struct ftrace_entry *field;
810 struct trace_seq *s = &iter->seq;
811
812 trace_assign_type(field, iter->ent);
813
814 SEQ_PUT_HEX_FIELD_RET(s, field->ip);
815 SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
816
817 return TRACE_TYPE_HANDLED;
818 }
819
820 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags)
821 {
822 struct ftrace_entry *field;
823 struct trace_seq *s = &iter->seq;
824
825 trace_assign_type(field, iter->ent);
826
827 SEQ_PUT_FIELD_RET(s, field->ip);
828 SEQ_PUT_FIELD_RET(s, field->parent_ip);
829
830 return TRACE_TYPE_HANDLED;
831 }
832
833 static struct trace_event trace_fn_event = {
834 .type = TRACE_FN,
835 .trace = trace_fn_trace,
836 .raw = trace_fn_raw,
837 .hex = trace_fn_hex,
838 .binary = trace_fn_bin,
839 };
840
841 /* TRACE_CTX an TRACE_WAKE */
842 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
843 char *delim)
844 {
845 struct ctx_switch_entry *field;
846 char comm[TASK_COMM_LEN];
847 int S, T;
848
849
850 trace_assign_type(field, iter->ent);
851
852 T = task_state_char(field->next_state);
853 S = task_state_char(field->prev_state);
854 trace_find_cmdline(field->next_pid, comm);
855 if (!trace_seq_printf(&iter->seq,
856 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
857 field->prev_pid,
858 field->prev_prio,
859 S, delim,
860 field->next_cpu,
861 field->next_pid,
862 field->next_prio,
863 T, comm))
864 return TRACE_TYPE_PARTIAL_LINE;
865
866 return TRACE_TYPE_HANDLED;
867 }
868
869 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags)
870 {
871 return trace_ctxwake_print(iter, "==>");
872 }
873
874 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
875 int flags)
876 {
877 return trace_ctxwake_print(iter, " +");
878 }
879
880 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
881 {
882 struct ctx_switch_entry *field;
883 int T;
884
885 trace_assign_type(field, iter->ent);
886
887 if (!S)
888 S = task_state_char(field->prev_state);
889 T = task_state_char(field->next_state);
890 if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
891 field->prev_pid,
892 field->prev_prio,
893 S,
894 field->next_cpu,
895 field->next_pid,
896 field->next_prio,
897 T))
898 return TRACE_TYPE_PARTIAL_LINE;
899
900 return TRACE_TYPE_HANDLED;
901 }
902
903 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags)
904 {
905 return trace_ctxwake_raw(iter, 0);
906 }
907
908 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags)
909 {
910 return trace_ctxwake_raw(iter, '+');
911 }
912
913
914 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
915 {
916 struct ctx_switch_entry *field;
917 struct trace_seq *s = &iter->seq;
918 int T;
919
920 trace_assign_type(field, iter->ent);
921
922 if (!S)
923 S = task_state_char(field->prev_state);
924 T = task_state_char(field->next_state);
925
926 SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
927 SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
928 SEQ_PUT_HEX_FIELD_RET(s, S);
929 SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
930 SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
931 SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
932 SEQ_PUT_HEX_FIELD_RET(s, T);
933
934 return TRACE_TYPE_HANDLED;
935 }
936
937 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags)
938 {
939 return trace_ctxwake_hex(iter, 0);
940 }
941
942 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags)
943 {
944 return trace_ctxwake_hex(iter, '+');
945 }
946
947 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
948 int flags)
949 {
950 struct ctx_switch_entry *field;
951 struct trace_seq *s = &iter->seq;
952
953 trace_assign_type(field, iter->ent);
954
955 SEQ_PUT_FIELD_RET(s, field->prev_pid);
956 SEQ_PUT_FIELD_RET(s, field->prev_prio);
957 SEQ_PUT_FIELD_RET(s, field->prev_state);
958 SEQ_PUT_FIELD_RET(s, field->next_pid);
959 SEQ_PUT_FIELD_RET(s, field->next_prio);
960 SEQ_PUT_FIELD_RET(s, field->next_state);
961
962 return TRACE_TYPE_HANDLED;
963 }
964
965 static struct trace_event trace_ctx_event = {
966 .type = TRACE_CTX,
967 .trace = trace_ctx_print,
968 .raw = trace_ctx_raw,
969 .hex = trace_ctx_hex,
970 .binary = trace_ctxwake_bin,
971 };
972
973 static struct trace_event trace_wake_event = {
974 .type = TRACE_WAKE,
975 .trace = trace_wake_print,
976 .raw = trace_wake_raw,
977 .hex = trace_wake_hex,
978 .binary = trace_ctxwake_bin,
979 };
980
981 /* TRACE_SPECIAL */
982 static enum print_line_t trace_special_print(struct trace_iterator *iter,
983 int flags)
984 {
985 struct special_entry *field;
986
987 trace_assign_type(field, iter->ent);
988
989 if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
990 field->arg1,
991 field->arg2,
992 field->arg3))
993 return TRACE_TYPE_PARTIAL_LINE;
994
995 return TRACE_TYPE_HANDLED;
996 }
997
998 static enum print_line_t trace_special_hex(struct trace_iterator *iter,
999 int flags)
1000 {
1001 struct special_entry *field;
1002 struct trace_seq *s = &iter->seq;
1003
1004 trace_assign_type(field, iter->ent);
1005
1006 SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
1007 SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
1008 SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
1009
1010 return TRACE_TYPE_HANDLED;
1011 }
1012
1013 static enum print_line_t trace_special_bin(struct trace_iterator *iter,
1014 int flags)
1015 {
1016 struct special_entry *field;
1017 struct trace_seq *s = &iter->seq;
1018
1019 trace_assign_type(field, iter->ent);
1020
1021 SEQ_PUT_FIELD_RET(s, field->arg1);
1022 SEQ_PUT_FIELD_RET(s, field->arg2);
1023 SEQ_PUT_FIELD_RET(s, field->arg3);
1024
1025 return TRACE_TYPE_HANDLED;
1026 }
1027
1028 static struct trace_event trace_special_event = {
1029 .type = TRACE_SPECIAL,
1030 .trace = trace_special_print,
1031 .raw = trace_special_print,
1032 .hex = trace_special_hex,
1033 .binary = trace_special_bin,
1034 };
1035
1036 /* TRACE_STACK */
1037
1038 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1039 int flags)
1040 {
1041 struct stack_entry *field;
1042 struct trace_seq *s = &iter->seq;
1043 int i;
1044
1045 trace_assign_type(field, iter->ent);
1046
1047 if (!trace_seq_puts(s, "<stack trace>\n"))
1048 goto partial;
1049 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1050 if (!field->caller[i] || (field->caller[i] == ULONG_MAX))
1051 break;
1052 if (!trace_seq_puts(s, " => "))
1053 goto partial;
1054
1055 if (!seq_print_ip_sym(s, field->caller[i], flags))
1056 goto partial;
1057 if (!trace_seq_puts(s, "\n"))
1058 goto partial;
1059 }
1060
1061 return TRACE_TYPE_HANDLED;
1062
1063 partial:
1064 return TRACE_TYPE_PARTIAL_LINE;
1065 }
1066
1067 static struct trace_event trace_stack_event = {
1068 .type = TRACE_STACK,
1069 .trace = trace_stack_print,
1070 .raw = trace_special_print,
1071 .hex = trace_special_hex,
1072 .binary = trace_special_bin,
1073 };
1074
1075 /* TRACE_USER_STACK */
1076 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1077 int flags)
1078 {
1079 struct userstack_entry *field;
1080 struct trace_seq *s = &iter->seq;
1081
1082 trace_assign_type(field, iter->ent);
1083
1084 if (!trace_seq_puts(s, "<user stack trace>\n"))
1085 goto partial;
1086
1087 if (!seq_print_userip_objs(field, s, flags))
1088 goto partial;
1089
1090 return TRACE_TYPE_HANDLED;
1091
1092 partial:
1093 return TRACE_TYPE_PARTIAL_LINE;
1094 }
1095
1096 static struct trace_event trace_user_stack_event = {
1097 .type = TRACE_USER_STACK,
1098 .trace = trace_user_stack_print,
1099 .raw = trace_special_print,
1100 .hex = trace_special_hex,
1101 .binary = trace_special_bin,
1102 };
1103
1104 /* TRACE_BPRINT */
1105 static enum print_line_t
1106 trace_bprint_print(struct trace_iterator *iter, int flags)
1107 {
1108 struct trace_entry *entry = iter->ent;
1109 struct trace_seq *s = &iter->seq;
1110 struct bprint_entry *field;
1111
1112 trace_assign_type(field, entry);
1113
1114 if (!seq_print_ip_sym(s, field->ip, flags))
1115 goto partial;
1116
1117 if (!trace_seq_puts(s, ": "))
1118 goto partial;
1119
1120 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1121 goto partial;
1122
1123 return TRACE_TYPE_HANDLED;
1124
1125 partial:
1126 return TRACE_TYPE_PARTIAL_LINE;
1127 }
1128
1129
1130 static enum print_line_t
1131 trace_bprint_raw(struct trace_iterator *iter, int flags)
1132 {
1133 struct bprint_entry *field;
1134 struct trace_seq *s = &iter->seq;
1135
1136 trace_assign_type(field, iter->ent);
1137
1138 if (!trace_seq_printf(s, ": %lx : ", field->ip))
1139 goto partial;
1140
1141 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1142 goto partial;
1143
1144 return TRACE_TYPE_HANDLED;
1145
1146 partial:
1147 return TRACE_TYPE_PARTIAL_LINE;
1148 }
1149
1150
1151 static struct trace_event trace_bprint_event = {
1152 .type = TRACE_BPRINT,
1153 .trace = trace_bprint_print,
1154 .raw = trace_bprint_raw,
1155 };
1156
1157 /* TRACE_PRINT */
1158 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1159 int flags)
1160 {
1161 struct print_entry *field;
1162 struct trace_seq *s = &iter->seq;
1163
1164 trace_assign_type(field, iter->ent);
1165
1166 if (!seq_print_ip_sym(s, field->ip, flags))
1167 goto partial;
1168
1169 if (!trace_seq_printf(s, ": %s", field->buf))
1170 goto partial;
1171
1172 return TRACE_TYPE_HANDLED;
1173
1174 partial:
1175 return TRACE_TYPE_PARTIAL_LINE;
1176 }
1177
1178 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
1179 {
1180 struct print_entry *field;
1181
1182 trace_assign_type(field, iter->ent);
1183
1184 if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1185 goto partial;
1186
1187 return TRACE_TYPE_HANDLED;
1188
1189 partial:
1190 return TRACE_TYPE_PARTIAL_LINE;
1191 }
1192
1193 static struct trace_event trace_print_event = {
1194 .type = TRACE_PRINT,
1195 .trace = trace_print_print,
1196 .raw = trace_print_raw,
1197 };
1198
1199
1200 static struct trace_event *events[] __initdata = {
1201 &trace_fn_event,
1202 &trace_ctx_event,
1203 &trace_wake_event,
1204 &trace_special_event,
1205 &trace_stack_event,
1206 &trace_user_stack_event,
1207 &trace_bprint_event,
1208 &trace_print_event,
1209 NULL
1210 };
1211
1212 __init static int init_events(void)
1213 {
1214 struct trace_event *event;
1215 int i, ret;
1216
1217 for (i = 0; events[i]; i++) {
1218 event = events[i];
1219
1220 ret = register_ftrace_event(event);
1221 if (!ret) {
1222 printk(KERN_WARNING "event %d failed to register\n",
1223 event->type);
1224 WARN_ON_ONCE(1);
1225 }
1226 }
1227
1228 return 0;
1229 }
1230 device_initcall(init_events);
linux 2.6 git repository for openrd