?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
powerpc/pmac: Add missing unlocks in error path
[linux-2.6/next.git] / kernel / trace / trace_output.c
blob8e46b3323cdcdd91ad9833aa1eb8d0f1bf82f3af
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 int 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 int ret;
30
31 ret = seq_write(m, s->buffer, len);
32
33 /*
34 * Only reset this buffer if we successfully wrote to the
35 * seq_file buffer.
36 */
37 if (!ret)
38 trace_seq_init(s);
39
40 return ret;
41 }
42
43 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
44 {
45 struct trace_seq *s = &iter->seq;
46 struct trace_entry *entry = iter->ent;
47 struct bprint_entry *field;
48 int ret;
49
50 trace_assign_type(field, entry);
51
52 ret = trace_seq_bprintf(s, field->fmt, field->buf);
53 if (!ret)
54 return TRACE_TYPE_PARTIAL_LINE;
55
56 return TRACE_TYPE_HANDLED;
57 }
58
59 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
60 {
61 struct trace_seq *s = &iter->seq;
62 struct trace_entry *entry = iter->ent;
63 struct print_entry *field;
64 int ret;
65
66 trace_assign_type(field, entry);
67
68 ret = trace_seq_printf(s, "%s", field->buf);
69 if (!ret)
70 return TRACE_TYPE_PARTIAL_LINE;
71
72 return TRACE_TYPE_HANDLED;
73 }
74
75 /**
76 * trace_seq_printf - sequence printing of trace information
77 * @s: trace sequence descriptor
78 * @fmt: printf format string
79 *
80 * It returns 0 if the trace oversizes the buffer's free
81 * space, 1 otherwise.
82 *
83 * The tracer may use either sequence operations or its own
84 * copy to user routines. To simplify formating of a trace
85 * trace_seq_printf is used to store strings into a special
86 * buffer (@s). Then the output may be either used by
87 * the sequencer or pulled into another buffer.
88 */
89 int
90 trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
91 {
92 int len = (PAGE_SIZE - 1) - s->len;
93 va_list ap;
94 int ret;
95
96 if (s->full || !len)
97 return 0;
98
99 va_start(ap, fmt);
100 ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
101 va_end(ap);
102
103 /* If we can't write it all, don't bother writing anything */
104 if (ret >= len) {
105 s->full = 1;
106 return 0;
107 }
108
109 s->len += ret;
110
111 return 1;
112 }
113 EXPORT_SYMBOL_GPL(trace_seq_printf);
114
115 /**
116 * trace_seq_vprintf - sequence printing of trace information
117 * @s: trace sequence descriptor
118 * @fmt: printf format string
119 *
120 * The tracer may use either sequence operations or its own
121 * copy to user routines. To simplify formating of a trace
122 * trace_seq_printf is used to store strings into a special
123 * buffer (@s). Then the output may be either used by
124 * the sequencer or pulled into another buffer.
125 */
126 int
127 trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
128 {
129 int len = (PAGE_SIZE - 1) - s->len;
130 int ret;
131
132 if (s->full || !len)
133 return 0;
134
135 ret = vsnprintf(s->buffer + s->len, len, fmt, args);
136
137 /* If we can't write it all, don't bother writing anything */
138 if (ret >= len) {
139 s->full = 1;
140 return 0;
141 }
142
143 s->len += ret;
144
145 return len;
146 }
147 EXPORT_SYMBOL_GPL(trace_seq_vprintf);
148
149 int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
150 {
151 int len = (PAGE_SIZE - 1) - s->len;
152 int ret;
153
154 if (s->full || !len)
155 return 0;
156
157 ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
158
159 /* If we can't write it all, don't bother writing anything */
160 if (ret >= len) {
161 s->full = 1;
162 return 0;
163 }
164
165 s->len += ret;
166
167 return len;
168 }
169
170 /**
171 * trace_seq_puts - trace sequence printing of simple string
172 * @s: trace sequence descriptor
173 * @str: simple string to record
174 *
175 * The tracer may use either the sequence operations or its own
176 * copy to user routines. This function records a simple string
177 * into a special buffer (@s) for later retrieval by a sequencer
178 * or other mechanism.
179 */
180 int trace_seq_puts(struct trace_seq *s, const char *str)
181 {
182 int len = strlen(str);
183
184 if (s->full)
185 return 0;
186
187 if (len > ((PAGE_SIZE - 1) - s->len)) {
188 s->full = 1;
189 return 0;
190 }
191
192 memcpy(s->buffer + s->len, str, len);
193 s->len += len;
194
195 return len;
196 }
197
198 int trace_seq_putc(struct trace_seq *s, unsigned char c)
199 {
200 if (s->full)
201 return 0;
202
203 if (s->len >= (PAGE_SIZE - 1)) {
204 s->full = 1;
205 return 0;
206 }
207
208 s->buffer[s->len++] = c;
209
210 return 1;
211 }
212
213 int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
214 {
215 if (s->full)
216 return 0;
217
218 if (len > ((PAGE_SIZE - 1) - s->len)) {
219 s->full = 1;
220 return 0;
221 }
222
223 memcpy(s->buffer + s->len, mem, len);
224 s->len += len;
225
226 return len;
227 }
228
229 int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
230 {
231 unsigned char hex[HEX_CHARS];
232 const unsigned char *data = mem;
233 int i, j;
234
235 if (s->full)
236 return 0;
237
238 #ifdef __BIG_ENDIAN
239 for (i = 0, j = 0; i < len; i++) {
240 #else
241 for (i = len-1, j = 0; i >= 0; i--) {
242 #endif
243 hex[j++] = hex_asc_hi(data[i]);
244 hex[j++] = hex_asc_lo(data[i]);
245 }
246 hex[j++] = ' ';
247
248 return trace_seq_putmem(s, hex, j);
249 }
250
251 void *trace_seq_reserve(struct trace_seq *s, size_t len)
252 {
253 void *ret;
254
255 if (s->full)
256 return 0;
257
258 if (len > ((PAGE_SIZE - 1) - s->len)) {
259 s->full = 1;
260 return NULL;
261 }
262
263 ret = s->buffer + s->len;
264 s->len += len;
265
266 return ret;
267 }
268
269 int trace_seq_path(struct trace_seq *s, struct path *path)
270 {
271 unsigned char *p;
272
273 if (s->full)
274 return 0;
275
276 if (s->len >= (PAGE_SIZE - 1)) {
277 s->full = 1;
278 return 0;
279 }
280
281 p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
282 if (!IS_ERR(p)) {
283 p = mangle_path(s->buffer + s->len, p, "\n");
284 if (p) {
285 s->len = p - s->buffer;
286 return 1;
287 }
288 } else {
289 s->buffer[s->len++] = '?';
290 return 1;
291 }
292
293 s->full = 1;
294 return 0;
295 }
296
297 const char *
298 ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
299 unsigned long flags,
300 const struct trace_print_flags *flag_array)
301 {
302 unsigned long mask;
303 const char *str;
304 const char *ret = p->buffer + p->len;
305 int i;
306
307 for (i = 0; flag_array[i].name && flags; i++) {
308
309 mask = flag_array[i].mask;
310 if ((flags & mask) != mask)
311 continue;
312
313 str = flag_array[i].name;
314 flags &= ~mask;
315 if (p->len && delim)
316 trace_seq_puts(p, delim);
317 trace_seq_puts(p, str);
318 }
319
320 /* check for left over flags */
321 if (flags) {
322 if (p->len && delim)
323 trace_seq_puts(p, delim);
324 trace_seq_printf(p, "0x%lx", flags);
325 }
326
327 trace_seq_putc(p, 0);
328
329 return ret;
330 }
331 EXPORT_SYMBOL(ftrace_print_flags_seq);
332
333 const char *
334 ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
335 const struct trace_print_flags *symbol_array)
336 {
337 int i;
338 const char *ret = p->buffer + p->len;
339
340 for (i = 0; symbol_array[i].name; i++) {
341
342 if (val != symbol_array[i].mask)
343 continue;
344
345 trace_seq_puts(p, symbol_array[i].name);
346 break;
347 }
348
349 if (!p->len)
350 trace_seq_printf(p, "0x%lx", val);
351
352 trace_seq_putc(p, 0);
353
354 return ret;
355 }
356 EXPORT_SYMBOL(ftrace_print_symbols_seq);
357
358 #ifdef CONFIG_KRETPROBES
359 static inline const char *kretprobed(const char *name)
360 {
361 static const char tramp_name[] = "kretprobe_trampoline";
362 int size = sizeof(tramp_name);
363
364 if (strncmp(tramp_name, name, size) == 0)
365 return "[unknown/kretprobe'd]";
366 return name;
367 }
368 #else
369 static inline const char *kretprobed(const char *name)
370 {
371 return name;
372 }
373 #endif /* CONFIG_KRETPROBES */
374
375 static int
376 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
377 {
378 #ifdef CONFIG_KALLSYMS
379 char str[KSYM_SYMBOL_LEN];
380 const char *name;
381
382 kallsyms_lookup(address, NULL, NULL, NULL, str);
383
384 name = kretprobed(str);
385
386 return trace_seq_printf(s, fmt, name);
387 #endif
388 return 1;
389 }
390
391 static int
392 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
393 unsigned long address)
394 {
395 #ifdef CONFIG_KALLSYMS
396 char str[KSYM_SYMBOL_LEN];
397 const char *name;
398
399 sprint_symbol(str, address);
400 name = kretprobed(str);
401
402 return trace_seq_printf(s, fmt, name);
403 #endif
404 return 1;
405 }
406
407 #ifndef CONFIG_64BIT
408 # define IP_FMT "%08lx"
409 #else
410 # define IP_FMT "%016lx"
411 #endif
412
413 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
414 unsigned long ip, unsigned long sym_flags)
415 {
416 struct file *file = NULL;
417 unsigned long vmstart = 0;
418 int ret = 1;
419
420 if (s->full)
421 return 0;
422
423 if (mm) {
424 const struct vm_area_struct *vma;
425
426 down_read(&mm->mmap_sem);
427 vma = find_vma(mm, ip);
428 if (vma) {
429 file = vma->vm_file;
430 vmstart = vma->vm_start;
431 }
432 if (file) {
433 ret = trace_seq_path(s, &file->f_path);
434 if (ret)
435 ret = trace_seq_printf(s, "[+0x%lx]",
436 ip - vmstart);
437 }
438 up_read(&mm->mmap_sem);
439 }
440 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
441 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
442 return ret;
443 }
444
445 int
446 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
447 unsigned long sym_flags)
448 {
449 struct mm_struct *mm = NULL;
450 int ret = 1;
451 unsigned int i;
452
453 if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
454 struct task_struct *task;
455 /*
456 * we do the lookup on the thread group leader,
457 * since individual threads might have already quit!
458 */
459 rcu_read_lock();
460 task = find_task_by_vpid(entry->tgid);
461 if (task)
462 mm = get_task_mm(task);
463 rcu_read_unlock();
464 }
465
466 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
467 unsigned long ip = entry->caller[i];
468
469 if (ip == ULONG_MAX || !ret)
470 break;
471 if (ret)
472 ret = trace_seq_puts(s, " => ");
473 if (!ip) {
474 if (ret)
475 ret = trace_seq_puts(s, "??");
476 if (ret)
477 ret = trace_seq_puts(s, "\n");
478 continue;
479 }
480 if (!ret)
481 break;
482 if (ret)
483 ret = seq_print_user_ip(s, mm, ip, sym_flags);
484 ret = trace_seq_puts(s, "\n");
485 }
486
487 if (mm)
488 mmput(mm);
489 return ret;
490 }
491
492 int
493 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
494 {
495 int ret;
496
497 if (!ip)
498 return trace_seq_printf(s, "0");
499
500 if (sym_flags & TRACE_ITER_SYM_OFFSET)
501 ret = seq_print_sym_offset(s, "%s", ip);
502 else
503 ret = seq_print_sym_short(s, "%s", ip);
504
505 if (!ret)
506 return 0;
507
508 if (sym_flags & TRACE_ITER_SYM_ADDR)
509 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
510 return ret;
511 }
512
513 /**
514 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
515 * @s: trace seq struct to write to
516 * @entry: The trace entry field from the ring buffer
517 *
518 * Prints the generic fields of irqs off, in hard or softirq, preempt
519 * count and lock depth.
520 */
521 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
522 {
523 int hardirq, softirq;
524 int ret;
525
526 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
527 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
528
529 if (!trace_seq_printf(s, "%c%c%c",
530 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
531 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
532 'X' : '.',
533 (entry->flags & TRACE_FLAG_NEED_RESCHED) ?
534 'N' : '.',
535 (hardirq && softirq) ? 'H' :
536 hardirq ? 'h' : softirq ? 's' : '.'))
537 return 0;
538
539 if (entry->preempt_count)
540 ret = trace_seq_printf(s, "%x", entry->preempt_count);
541 else
542 ret = trace_seq_putc(s, '.');
543
544 if (!ret)
545 return 0;
546
547 if (entry->lock_depth < 0)
548 return trace_seq_putc(s, '.');
549
550 return trace_seq_printf(s, "%d", entry->lock_depth);
551 }
552
553 static int
554 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
555 {
556 char comm[TASK_COMM_LEN];
557
558 trace_find_cmdline(entry->pid, comm);
559
560 if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
561 comm, entry->pid, cpu))
562 return 0;
563
564 return trace_print_lat_fmt(s, entry);
565 }
566
567 static unsigned long preempt_mark_thresh = 100;
568
569 static int
570 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
571 unsigned long rel_usecs)
572 {
573 return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
574 rel_usecs > preempt_mark_thresh ? '!' :
575 rel_usecs > 1 ? '+' : ' ');
576 }
577
578 int trace_print_context(struct trace_iterator *iter)
579 {
580 struct trace_seq *s = &iter->seq;
581 struct trace_entry *entry = iter->ent;
582 unsigned long long t = ns2usecs(iter->ts);
583 unsigned long usec_rem = do_div(t, USEC_PER_SEC);
584 unsigned long secs = (unsigned long)t;
585 char comm[TASK_COMM_LEN];
586
587 trace_find_cmdline(entry->pid, comm);
588
589 return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
590 comm, entry->pid, iter->cpu, secs, usec_rem);
591 }
592
593 int trace_print_lat_context(struct trace_iterator *iter)
594 {
595 u64 next_ts;
596 int ret;
597 struct trace_seq *s = &iter->seq;
598 struct trace_entry *entry = iter->ent,
599 *next_entry = trace_find_next_entry(iter, NULL,
600 &next_ts);
601 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
602 unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
603 unsigned long rel_usecs;
604
605 if (!next_entry)
606 next_ts = iter->ts;
607 rel_usecs = ns2usecs(next_ts - iter->ts);
608
609 if (verbose) {
610 char comm[TASK_COMM_LEN];
611
612 trace_find_cmdline(entry->pid, comm);
613
614 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
615 " %ld.%03ldms (+%ld.%03ldms): ", comm,
616 entry->pid, iter->cpu, entry->flags,
617 entry->preempt_count, iter->idx,
618 ns2usecs(iter->ts),
619 abs_usecs / USEC_PER_MSEC,
620 abs_usecs % USEC_PER_MSEC,
621 rel_usecs / USEC_PER_MSEC,
622 rel_usecs % USEC_PER_MSEC);
623 } else {
624 ret = lat_print_generic(s, entry, iter->cpu);
625 if (ret)
626 ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
627 }
628
629 return ret;
630 }
631
632 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
633
634 static int task_state_char(unsigned long state)
635 {
636 int bit = state ? __ffs(state) + 1 : 0;
637
638 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
639 }
640
641 /**
642 * ftrace_find_event - find a registered event
643 * @type: the type of event to look for
644 *
645 * Returns an event of type @type otherwise NULL
646 * Called with trace_event_read_lock() held.
647 */
648 struct trace_event *ftrace_find_event(int type)
649 {
650 struct trace_event *event;
651 struct hlist_node *n;
652 unsigned key;
653
654 key = type & (EVENT_HASHSIZE - 1);
655
656 hlist_for_each_entry(event, n, &event_hash[key], node) {
657 if (event->type == type)
658 return event;
659 }
660
661 return NULL;
662 }
663
664 static LIST_HEAD(ftrace_event_list);
665
666 static int trace_search_list(struct list_head **list)
667 {
668 struct trace_event *e;
669 int last = __TRACE_LAST_TYPE;
670
671 if (list_empty(&ftrace_event_list)) {
672 *list = &ftrace_event_list;
673 return last + 1;
674 }
675
676 /*
677 * We used up all possible max events,
678 * lets see if somebody freed one.
679 */
680 list_for_each_entry(e, &ftrace_event_list, list) {
681 if (e->type != last + 1)
682 break;
683 last++;
684 }
685
686 /* Did we used up all 65 thousand events??? */
687 if ((last + 1) > FTRACE_MAX_EVENT)
688 return 0;
689
690 *list = &e->list;
691 return last + 1;
692 }
693
694 void trace_event_read_lock(void)
695 {
696 down_read(&trace_event_mutex);
697 }
698
699 void trace_event_read_unlock(void)
700 {
701 up_read(&trace_event_mutex);
702 }
703
704 /**
705 * register_ftrace_event - register output for an event type
706 * @event: the event type to register
707 *
708 * Event types are stored in a hash and this hash is used to
709 * find a way to print an event. If the @event->type is set
710 * then it will use that type, otherwise it will assign a
711 * type to use.
712 *
713 * If you assign your own type, please make sure it is added
714 * to the trace_type enum in trace.h, to avoid collisions
715 * with the dynamic types.
716 *
717 * Returns the event type number or zero on error.
718 */
719 int register_ftrace_event(struct trace_event *event)
720 {
721 unsigned key;
722 int ret = 0;
723
724 down_write(&trace_event_mutex);
725
726 if (WARN_ON(!event))
727 goto out;
728
729 INIT_LIST_HEAD(&event->list);
730
731 if (!event->type) {
732 struct list_head *list = NULL;
733
734 if (next_event_type > FTRACE_MAX_EVENT) {
735
736 event->type = trace_search_list(&list);
737 if (!event->type)
738 goto out;
739
740 } else {
741
742 event->type = next_event_type++;
743 list = &ftrace_event_list;
744 }
745
746 if (WARN_ON(ftrace_find_event(event->type)))
747 goto out;
748
749 list_add_tail(&event->list, list);
750
751 } else if (event->type > __TRACE_LAST_TYPE) {
752 printk(KERN_WARNING "Need to add type to trace.h\n");
753 WARN_ON(1);
754 goto out;
755 } else {
756 /* Is this event already used */
757 if (ftrace_find_event(event->type))
758 goto out;
759 }
760
761 if (event->trace == NULL)
762 event->trace = trace_nop_print;
763 if (event->raw == NULL)
764 event->raw = trace_nop_print;
765 if (event->hex == NULL)
766 event->hex = trace_nop_print;
767 if (event->binary == NULL)
768 event->binary = trace_nop_print;
769
770 key = event->type & (EVENT_HASHSIZE - 1);
771
772 hlist_add_head(&event->node, &event_hash[key]);
773
774 ret = event->type;
775 out:
776 up_write(&trace_event_mutex);
777
778 return ret;
779 }
780 EXPORT_SYMBOL_GPL(register_ftrace_event);
781
782 /*
783 * Used by module code with the trace_event_mutex held for write.
784 */
785 int __unregister_ftrace_event(struct trace_event *event)
786 {
787 hlist_del(&event->node);
788 list_del(&event->list);
789 return 0;
790 }
791
792 /**
793 * unregister_ftrace_event - remove a no longer used event
794 * @event: the event to remove
795 */
796 int unregister_ftrace_event(struct trace_event *event)
797 {
798 down_write(&trace_event_mutex);
799 __unregister_ftrace_event(event);
800 up_write(&trace_event_mutex);
801
802 return 0;
803 }
804 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
805
806 /*
807 * Standard events
808 */
809
810 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags)
811 {
812 return TRACE_TYPE_HANDLED;
813 }
814
815 /* TRACE_FN */
816 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags)
817 {
818 struct ftrace_entry *field;
819 struct trace_seq *s = &iter->seq;
820
821 trace_assign_type(field, iter->ent);
822
823 if (!seq_print_ip_sym(s, field->ip, flags))
824 goto partial;
825
826 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
827 if (!trace_seq_printf(s, " <-"))
828 goto partial;
829 if (!seq_print_ip_sym(s,
830 field->parent_ip,
831 flags))
832 goto partial;
833 }
834 if (!trace_seq_printf(s, "\n"))
835 goto partial;
836
837 return TRACE_TYPE_HANDLED;
838
839 partial:
840 return TRACE_TYPE_PARTIAL_LINE;
841 }
842
843 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags)
844 {
845 struct ftrace_entry *field;
846
847 trace_assign_type(field, iter->ent);
848
849 if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
850 field->ip,
851 field->parent_ip))
852 return TRACE_TYPE_PARTIAL_LINE;
853
854 return TRACE_TYPE_HANDLED;
855 }
856
857 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags)
858 {
859 struct ftrace_entry *field;
860 struct trace_seq *s = &iter->seq;
861
862 trace_assign_type(field, iter->ent);
863
864 SEQ_PUT_HEX_FIELD_RET(s, field->ip);
865 SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
866
867 return TRACE_TYPE_HANDLED;
868 }
869
870 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags)
871 {
872 struct ftrace_entry *field;
873 struct trace_seq *s = &iter->seq;
874
875 trace_assign_type(field, iter->ent);
876
877 SEQ_PUT_FIELD_RET(s, field->ip);
878 SEQ_PUT_FIELD_RET(s, field->parent_ip);
879
880 return TRACE_TYPE_HANDLED;
881 }
882
883 static struct trace_event trace_fn_event = {
884 .type = TRACE_FN,
885 .trace = trace_fn_trace,
886 .raw = trace_fn_raw,
887 .hex = trace_fn_hex,
888 .binary = trace_fn_bin,
889 };
890
891 /* TRACE_CTX an TRACE_WAKE */
892 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
893 char *delim)
894 {
895 struct ctx_switch_entry *field;
896 char comm[TASK_COMM_LEN];
897 int S, T;
898
899
900 trace_assign_type(field, iter->ent);
901
902 T = task_state_char(field->next_state);
903 S = task_state_char(field->prev_state);
904 trace_find_cmdline(field->next_pid, comm);
905 if (!trace_seq_printf(&iter->seq,
906 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
907 field->prev_pid,
908 field->prev_prio,
909 S, delim,
910 field->next_cpu,
911 field->next_pid,
912 field->next_prio,
913 T, comm))
914 return TRACE_TYPE_PARTIAL_LINE;
915
916 return TRACE_TYPE_HANDLED;
917 }
918
919 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags)
920 {
921 return trace_ctxwake_print(iter, "==>");
922 }
923
924 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
925 int flags)
926 {
927 return trace_ctxwake_print(iter, " +");
928 }
929
930 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
931 {
932 struct ctx_switch_entry *field;
933 int T;
934
935 trace_assign_type(field, iter->ent);
936
937 if (!S)
938 S = task_state_char(field->prev_state);
939 T = task_state_char(field->next_state);
940 if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
941 field->prev_pid,
942 field->prev_prio,
943 S,
944 field->next_cpu,
945 field->next_pid,
946 field->next_prio,
947 T))
948 return TRACE_TYPE_PARTIAL_LINE;
949
950 return TRACE_TYPE_HANDLED;
951 }
952
953 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags)
954 {
955 return trace_ctxwake_raw(iter, 0);
956 }
957
958 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags)
959 {
960 return trace_ctxwake_raw(iter, '+');
961 }
962
963
964 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
965 {
966 struct ctx_switch_entry *field;
967 struct trace_seq *s = &iter->seq;
968 int T;
969
970 trace_assign_type(field, iter->ent);
971
972 if (!S)
973 S = task_state_char(field->prev_state);
974 T = task_state_char(field->next_state);
975
976 SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
977 SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
978 SEQ_PUT_HEX_FIELD_RET(s, S);
979 SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
980 SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
981 SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
982 SEQ_PUT_HEX_FIELD_RET(s, T);
983
984 return TRACE_TYPE_HANDLED;
985 }
986
987 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags)
988 {
989 return trace_ctxwake_hex(iter, 0);
990 }
991
992 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags)
993 {
994 return trace_ctxwake_hex(iter, '+');
995 }
996
997 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
998 int flags)
999 {
1000 struct ctx_switch_entry *field;
1001 struct trace_seq *s = &iter->seq;
1002
1003 trace_assign_type(field, iter->ent);
1004
1005 SEQ_PUT_FIELD_RET(s, field->prev_pid);
1006 SEQ_PUT_FIELD_RET(s, field->prev_prio);
1007 SEQ_PUT_FIELD_RET(s, field->prev_state);
1008 SEQ_PUT_FIELD_RET(s, field->next_pid);
1009 SEQ_PUT_FIELD_RET(s, field->next_prio);
1010 SEQ_PUT_FIELD_RET(s, field->next_state);
1011
1012 return TRACE_TYPE_HANDLED;
1013 }
1014
1015 static struct trace_event trace_ctx_event = {
1016 .type = TRACE_CTX,
1017 .trace = trace_ctx_print,
1018 .raw = trace_ctx_raw,
1019 .hex = trace_ctx_hex,
1020 .binary = trace_ctxwake_bin,
1021 };
1022
1023 static struct trace_event trace_wake_event = {
1024 .type = TRACE_WAKE,
1025 .trace = trace_wake_print,
1026 .raw = trace_wake_raw,
1027 .hex = trace_wake_hex,
1028 .binary = trace_ctxwake_bin,
1029 };
1030
1031 /* TRACE_SPECIAL */
1032 static enum print_line_t trace_special_print(struct trace_iterator *iter,
1033 int flags)
1034 {
1035 struct special_entry *field;
1036
1037 trace_assign_type(field, iter->ent);
1038
1039 if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
1040 field->arg1,
1041 field->arg2,
1042 field->arg3))
1043 return TRACE_TYPE_PARTIAL_LINE;
1044
1045 return TRACE_TYPE_HANDLED;
1046 }
1047
1048 static enum print_line_t trace_special_hex(struct trace_iterator *iter,
1049 int flags)
1050 {
1051 struct special_entry *field;
1052 struct trace_seq *s = &iter->seq;
1053
1054 trace_assign_type(field, iter->ent);
1055
1056 SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
1057 SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
1058 SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
1059
1060 return TRACE_TYPE_HANDLED;
1061 }
1062
1063 static enum print_line_t trace_special_bin(struct trace_iterator *iter,
1064 int flags)
1065 {
1066 struct special_entry *field;
1067 struct trace_seq *s = &iter->seq;
1068
1069 trace_assign_type(field, iter->ent);
1070
1071 SEQ_PUT_FIELD_RET(s, field->arg1);
1072 SEQ_PUT_FIELD_RET(s, field->arg2);
1073 SEQ_PUT_FIELD_RET(s, field->arg3);
1074
1075 return TRACE_TYPE_HANDLED;
1076 }
1077
1078 static struct trace_event trace_special_event = {
1079 .type = TRACE_SPECIAL,
1080 .trace = trace_special_print,
1081 .raw = trace_special_print,
1082 .hex = trace_special_hex,
1083 .binary = trace_special_bin,
1084 };
1085
1086 /* TRACE_STACK */
1087
1088 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1089 int flags)
1090 {
1091 struct stack_entry *field;
1092 struct trace_seq *s = &iter->seq;
1093 int i;
1094
1095 trace_assign_type(field, iter->ent);
1096
1097 if (!trace_seq_puts(s, "<stack trace>\n"))
1098 goto partial;
1099 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1100 if (!field->caller[i] || (field->caller[i] == ULONG_MAX))
1101 break;
1102 if (!trace_seq_puts(s, " => "))
1103 goto partial;
1104
1105 if (!seq_print_ip_sym(s, field->caller[i], flags))
1106 goto partial;
1107 if (!trace_seq_puts(s, "\n"))
1108 goto partial;
1109 }
1110
1111 return TRACE_TYPE_HANDLED;
1112
1113 partial:
1114 return TRACE_TYPE_PARTIAL_LINE;
1115 }
1116
1117 static struct trace_event trace_stack_event = {
1118 .type = TRACE_STACK,
1119 .trace = trace_stack_print,
1120 .raw = trace_special_print,
1121 .hex = trace_special_hex,
1122 .binary = trace_special_bin,
1123 };
1124
1125 /* TRACE_USER_STACK */
1126 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1127 int flags)
1128 {
1129 struct userstack_entry *field;
1130 struct trace_seq *s = &iter->seq;
1131
1132 trace_assign_type(field, iter->ent);
1133
1134 if (!trace_seq_puts(s, "<user stack trace>\n"))
1135 goto partial;
1136
1137 if (!seq_print_userip_objs(field, s, flags))
1138 goto partial;
1139
1140 return TRACE_TYPE_HANDLED;
1141
1142 partial:
1143 return TRACE_TYPE_PARTIAL_LINE;
1144 }
1145
1146 static struct trace_event trace_user_stack_event = {
1147 .type = TRACE_USER_STACK,
1148 .trace = trace_user_stack_print,
1149 .raw = trace_special_print,
1150 .hex = trace_special_hex,
1151 .binary = trace_special_bin,
1152 };
1153
1154 /* TRACE_BPRINT */
1155 static enum print_line_t
1156 trace_bprint_print(struct trace_iterator *iter, int flags)
1157 {
1158 struct trace_entry *entry = iter->ent;
1159 struct trace_seq *s = &iter->seq;
1160 struct bprint_entry *field;
1161
1162 trace_assign_type(field, entry);
1163
1164 if (!seq_print_ip_sym(s, field->ip, flags))
1165 goto partial;
1166
1167 if (!trace_seq_puts(s, ": "))
1168 goto partial;
1169
1170 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1171 goto partial;
1172
1173 return TRACE_TYPE_HANDLED;
1174
1175 partial:
1176 return TRACE_TYPE_PARTIAL_LINE;
1177 }
1178
1179
1180 static enum print_line_t
1181 trace_bprint_raw(struct trace_iterator *iter, int flags)
1182 {
1183 struct bprint_entry *field;
1184 struct trace_seq *s = &iter->seq;
1185
1186 trace_assign_type(field, iter->ent);
1187
1188 if (!trace_seq_printf(s, ": %lx : ", field->ip))
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 struct trace_event trace_bprint_event = {
1202 .type = TRACE_BPRINT,
1203 .trace = trace_bprint_print,
1204 .raw = trace_bprint_raw,
1205 };
1206
1207 /* TRACE_PRINT */
1208 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1209 int flags)
1210 {
1211 struct print_entry *field;
1212 struct trace_seq *s = &iter->seq;
1213
1214 trace_assign_type(field, iter->ent);
1215
1216 if (!seq_print_ip_sym(s, field->ip, flags))
1217 goto partial;
1218
1219 if (!trace_seq_printf(s, ": %s", field->buf))
1220 goto partial;
1221
1222 return TRACE_TYPE_HANDLED;
1223
1224 partial:
1225 return TRACE_TYPE_PARTIAL_LINE;
1226 }
1227
1228 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
1229 {
1230 struct print_entry *field;
1231
1232 trace_assign_type(field, iter->ent);
1233
1234 if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1235 goto partial;
1236
1237 return TRACE_TYPE_HANDLED;
1238
1239 partial:
1240 return TRACE_TYPE_PARTIAL_LINE;
1241 }
1242
1243 static struct trace_event trace_print_event = {
1244 .type = TRACE_PRINT,
1245 .trace = trace_print_print,
1246 .raw = trace_print_raw,
1247 };
1248
1249
1250 static struct trace_event *events[] __initdata = {
1251 &trace_fn_event,
1252 &trace_ctx_event,
1253 &trace_wake_event,
1254 &trace_special_event,
1255 &trace_stack_event,
1256 &trace_user_stack_event,
1257 &trace_bprint_event,
1258 &trace_print_event,
1259 NULL
1260 };
1261
1262 __init static int init_events(void)
1263 {
1264 struct trace_event *event;
1265 int i, ret;
1266
1267 for (i = 0; events[i]; i++) {
1268 event = events[i];
1269
1270 ret = register_ftrace_event(event);
1271 if (!ret) {
1272 printk(KERN_WARNING "event %d failed to register\n",
1273 event->type);
1274 WARN_ON_ONCE(1);
1275 }
1276 }
1277
1278 return 0;
1279 }
1280 device_initcall(init_events);
linux-next