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dm mpath: fix potential NULL pointer in feature arg processing
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / kernel / trace / trace_output.c
blobb6c12c6a1bcde267a7e25d6b1b8df41c559f1500
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 * It returns 0 if the trace oversizes the buffer's free
73 * space, 1 otherwise.
74 *
75 * The tracer may use either sequence operations or its own
76 * copy to user routines. To simplify formating of a trace
77 * trace_seq_printf is used to store strings into a special
78 * buffer (@s). Then the output may be either used by
79 * the sequencer or pulled into another buffer.
80 */
81 int
82 trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
83 {
84 int len = (PAGE_SIZE - 1) - s->len;
85 va_list ap;
86 int ret;
87
88 if (!len)
89 return 0;
90
91 va_start(ap, fmt);
92 ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
93 va_end(ap);
94
95 /* If we can't write it all, don't bother writing anything */
96 if (ret >= len)
97 return 0;
98
99 s->len += ret;
100
101 return 1;
102 }
103 EXPORT_SYMBOL_GPL(trace_seq_printf);
104
105 /**
106 * trace_seq_vprintf - sequence printing of trace information
107 * @s: trace sequence descriptor
108 * @fmt: printf format string
109 *
110 * The tracer may use either sequence operations or its own
111 * copy to user routines. To simplify formating of a trace
112 * trace_seq_printf is used to store strings into a special
113 * buffer (@s). Then the output may be either used by
114 * the sequencer or pulled into another buffer.
115 */
116 int
117 trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
118 {
119 int len = (PAGE_SIZE - 1) - s->len;
120 int ret;
121
122 if (!len)
123 return 0;
124
125 ret = vsnprintf(s->buffer + s->len, len, fmt, args);
126
127 /* If we can't write it all, don't bother writing anything */
128 if (ret >= len)
129 return 0;
130
131 s->len += ret;
132
133 return len;
134 }
135 EXPORT_SYMBOL_GPL(trace_seq_vprintf);
136
137 int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
138 {
139 int len = (PAGE_SIZE - 1) - s->len;
140 int ret;
141
142 if (!len)
143 return 0;
144
145 ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
146
147 /* If we can't write it all, don't bother writing anything */
148 if (ret >= len)
149 return 0;
150
151 s->len += ret;
152
153 return len;
154 }
155
156 /**
157 * trace_seq_puts - trace sequence printing of simple string
158 * @s: trace sequence descriptor
159 * @str: simple string to record
160 *
161 * The tracer may use either the sequence operations or its own
162 * copy to user routines. This function records a simple string
163 * into a special buffer (@s) for later retrieval by a sequencer
164 * or other mechanism.
165 */
166 int trace_seq_puts(struct trace_seq *s, const char *str)
167 {
168 int len = strlen(str);
169
170 if (len > ((PAGE_SIZE - 1) - s->len))
171 return 0;
172
173 memcpy(s->buffer + s->len, str, len);
174 s->len += len;
175
176 return len;
177 }
178
179 int trace_seq_putc(struct trace_seq *s, unsigned char c)
180 {
181 if (s->len >= (PAGE_SIZE - 1))
182 return 0;
183
184 s->buffer[s->len++] = c;
185
186 return 1;
187 }
188
189 int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
190 {
191 if (len > ((PAGE_SIZE - 1) - s->len))
192 return 0;
193
194 memcpy(s->buffer + s->len, mem, len);
195 s->len += len;
196
197 return len;
198 }
199
200 int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
201 {
202 unsigned char hex[HEX_CHARS];
203 const unsigned char *data = mem;
204 int i, j;
205
206 #ifdef __BIG_ENDIAN
207 for (i = 0, j = 0; i < len; i++) {
208 #else
209 for (i = len-1, j = 0; i >= 0; i--) {
210 #endif
211 hex[j++] = hex_asc_hi(data[i]);
212 hex[j++] = hex_asc_lo(data[i]);
213 }
214 hex[j++] = ' ';
215
216 return trace_seq_putmem(s, hex, j);
217 }
218
219 void *trace_seq_reserve(struct trace_seq *s, size_t len)
220 {
221 void *ret;
222
223 if (len > ((PAGE_SIZE - 1) - s->len))
224 return NULL;
225
226 ret = s->buffer + s->len;
227 s->len += len;
228
229 return ret;
230 }
231
232 int trace_seq_path(struct trace_seq *s, struct path *path)
233 {
234 unsigned char *p;
235
236 if (s->len >= (PAGE_SIZE - 1))
237 return 0;
238 p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
239 if (!IS_ERR(p)) {
240 p = mangle_path(s->buffer + s->len, p, "\n");
241 if (p) {
242 s->len = p - s->buffer;
243 return 1;
244 }
245 } else {
246 s->buffer[s->len++] = '?';
247 return 1;
248 }
249
250 return 0;
251 }
252
253 const char *
254 ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
255 unsigned long flags,
256 const struct trace_print_flags *flag_array)
257 {
258 unsigned long mask;
259 const char *str;
260 const char *ret = p->buffer + p->len;
261 int i;
262
263 for (i = 0; flag_array[i].name && flags; i++) {
264
265 mask = flag_array[i].mask;
266 if ((flags & mask) != mask)
267 continue;
268
269 str = flag_array[i].name;
270 flags &= ~mask;
271 if (p->len && delim)
272 trace_seq_puts(p, delim);
273 trace_seq_puts(p, str);
274 }
275
276 /* check for left over flags */
277 if (flags) {
278 if (p->len && delim)
279 trace_seq_puts(p, delim);
280 trace_seq_printf(p, "0x%lx", flags);
281 }
282
283 trace_seq_putc(p, 0);
284
285 return ret;
286 }
287 EXPORT_SYMBOL(ftrace_print_flags_seq);
288
289 const char *
290 ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
291 const struct trace_print_flags *symbol_array)
292 {
293 int i;
294 const char *ret = p->buffer + p->len;
295
296 for (i = 0; symbol_array[i].name; i++) {
297
298 if (val != symbol_array[i].mask)
299 continue;
300
301 trace_seq_puts(p, symbol_array[i].name);
302 break;
303 }
304
305 if (!p->len)
306 trace_seq_printf(p, "0x%lx", val);
307
308 trace_seq_putc(p, 0);
309
310 return ret;
311 }
312 EXPORT_SYMBOL(ftrace_print_symbols_seq);
313
314 #ifdef CONFIG_KRETPROBES
315 static inline const char *kretprobed(const char *name)
316 {
317 static const char tramp_name[] = "kretprobe_trampoline";
318 int size = sizeof(tramp_name);
319
320 if (strncmp(tramp_name, name, size) == 0)
321 return "[unknown/kretprobe'd]";
322 return name;
323 }
324 #else
325 static inline const char *kretprobed(const char *name)
326 {
327 return name;
328 }
329 #endif /* CONFIG_KRETPROBES */
330
331 static int
332 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
333 {
334 #ifdef CONFIG_KALLSYMS
335 char str[KSYM_SYMBOL_LEN];
336 const char *name;
337
338 kallsyms_lookup(address, NULL, NULL, NULL, str);
339
340 name = kretprobed(str);
341
342 return trace_seq_printf(s, fmt, name);
343 #endif
344 return 1;
345 }
346
347 static int
348 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
349 unsigned long address)
350 {
351 #ifdef CONFIG_KALLSYMS
352 char str[KSYM_SYMBOL_LEN];
353 const char *name;
354
355 sprint_symbol(str, address);
356 name = kretprobed(str);
357
358 return trace_seq_printf(s, fmt, name);
359 #endif
360 return 1;
361 }
362
363 #ifndef CONFIG_64BIT
364 # define IP_FMT "%08lx"
365 #else
366 # define IP_FMT "%016lx"
367 #endif
368
369 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
370 unsigned long ip, unsigned long sym_flags)
371 {
372 struct file *file = NULL;
373 unsigned long vmstart = 0;
374 int ret = 1;
375
376 if (mm) {
377 const struct vm_area_struct *vma;
378
379 down_read(&mm->mmap_sem);
380 vma = find_vma(mm, ip);
381 if (vma) {
382 file = vma->vm_file;
383 vmstart = vma->vm_start;
384 }
385 if (file) {
386 ret = trace_seq_path(s, &file->f_path);
387 if (ret)
388 ret = trace_seq_printf(s, "[+0x%lx]",
389 ip - vmstart);
390 }
391 up_read(&mm->mmap_sem);
392 }
393 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
394 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
395 return ret;
396 }
397
398 int
399 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
400 unsigned long sym_flags)
401 {
402 struct mm_struct *mm = NULL;
403 int ret = 1;
404 unsigned int i;
405
406 if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
407 struct task_struct *task;
408 /*
409 * we do the lookup on the thread group leader,
410 * since individual threads might have already quit!
411 */
412 rcu_read_lock();
413 task = find_task_by_vpid(entry->tgid);
414 if (task)
415 mm = get_task_mm(task);
416 rcu_read_unlock();
417 }
418
419 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
420 unsigned long ip = entry->caller[i];
421
422 if (ip == ULONG_MAX || !ret)
423 break;
424 if (ret)
425 ret = trace_seq_puts(s, " => ");
426 if (!ip) {
427 if (ret)
428 ret = trace_seq_puts(s, "??");
429 if (ret)
430 ret = trace_seq_puts(s, "\n");
431 continue;
432 }
433 if (!ret)
434 break;
435 if (ret)
436 ret = seq_print_user_ip(s, mm, ip, sym_flags);
437 ret = trace_seq_puts(s, "\n");
438 }
439
440 if (mm)
441 mmput(mm);
442 return ret;
443 }
444
445 int
446 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
447 {
448 int ret;
449
450 if (!ip)
451 return trace_seq_printf(s, "0");
452
453 if (sym_flags & TRACE_ITER_SYM_OFFSET)
454 ret = seq_print_sym_offset(s, "%s", ip);
455 else
456 ret = seq_print_sym_short(s, "%s", ip);
457
458 if (!ret)
459 return 0;
460
461 if (sym_flags & TRACE_ITER_SYM_ADDR)
462 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
463 return ret;
464 }
465
466 /**
467 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
468 * @s: trace seq struct to write to
469 * @entry: The trace entry field from the ring buffer
470 *
471 * Prints the generic fields of irqs off, in hard or softirq, preempt
472 * count and lock depth.
473 */
474 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
475 {
476 int hardirq, softirq;
477 int ret;
478
479 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
480 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
481
482 if (!trace_seq_printf(s, "%c%c%c",
483 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
484 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
485 'X' : '.',
486 (entry->flags & TRACE_FLAG_NEED_RESCHED) ?
487 'N' : '.',
488 (hardirq && softirq) ? 'H' :
489 hardirq ? 'h' : softirq ? 's' : '.'))
490 return 0;
491
492 if (entry->preempt_count)
493 ret = trace_seq_printf(s, "%x", entry->preempt_count);
494 else
495 ret = trace_seq_putc(s, '.');
496
497 if (!ret)
498 return 0;
499
500 if (entry->lock_depth < 0)
501 return trace_seq_putc(s, '.');
502
503 return trace_seq_printf(s, "%d", entry->lock_depth);
504 }
505
506 static int
507 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
508 {
509 char comm[TASK_COMM_LEN];
510
511 trace_find_cmdline(entry->pid, comm);
512
513 if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
514 comm, entry->pid, cpu))
515 return 0;
516
517 return trace_print_lat_fmt(s, entry);
518 }
519
520 static unsigned long preempt_mark_thresh = 100;
521
522 static int
523 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
524 unsigned long rel_usecs)
525 {
526 return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
527 rel_usecs > preempt_mark_thresh ? '!' :
528 rel_usecs > 1 ? '+' : ' ');
529 }
530
531 int trace_print_context(struct trace_iterator *iter)
532 {
533 struct trace_seq *s = &iter->seq;
534 struct trace_entry *entry = iter->ent;
535 unsigned long long t = ns2usecs(iter->ts);
536 unsigned long usec_rem = do_div(t, USEC_PER_SEC);
537 unsigned long secs = (unsigned long)t;
538 char comm[TASK_COMM_LEN];
539
540 trace_find_cmdline(entry->pid, comm);
541
542 return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
543 comm, entry->pid, iter->cpu, secs, usec_rem);
544 }
545
546 int trace_print_lat_context(struct trace_iterator *iter)
547 {
548 u64 next_ts;
549 int ret;
550 struct trace_seq *s = &iter->seq;
551 struct trace_entry *entry = iter->ent,
552 *next_entry = trace_find_next_entry(iter, NULL,
553 &next_ts);
554 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
555 unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
556 unsigned long rel_usecs;
557
558 if (!next_entry)
559 next_ts = iter->ts;
560 rel_usecs = ns2usecs(next_ts - iter->ts);
561
562 if (verbose) {
563 char comm[TASK_COMM_LEN];
564
565 trace_find_cmdline(entry->pid, comm);
566
567 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
568 " %ld.%03ldms (+%ld.%03ldms): ", comm,
569 entry->pid, iter->cpu, entry->flags,
570 entry->preempt_count, iter->idx,
571 ns2usecs(iter->ts),
572 abs_usecs / USEC_PER_MSEC,
573 abs_usecs % USEC_PER_MSEC,
574 rel_usecs / USEC_PER_MSEC,
575 rel_usecs % USEC_PER_MSEC);
576 } else {
577 ret = lat_print_generic(s, entry, iter->cpu);
578 if (ret)
579 ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
580 }
581
582 return ret;
583 }
584
585 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
586
587 static int task_state_char(unsigned long state)
588 {
589 int bit = state ? __ffs(state) + 1 : 0;
590
591 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
592 }
593
594 /**
595 * ftrace_find_event - find a registered event
596 * @type: the type of event to look for
597 *
598 * Returns an event of type @type otherwise NULL
599 * Called with trace_event_read_lock() held.
600 */
601 struct trace_event *ftrace_find_event(int type)
602 {
603 struct trace_event *event;
604 struct hlist_node *n;
605 unsigned key;
606
607 key = type & (EVENT_HASHSIZE - 1);
608
609 hlist_for_each_entry(event, n, &event_hash[key], node) {
610 if (event->type == type)
611 return event;
612 }
613
614 return NULL;
615 }
616
617 static LIST_HEAD(ftrace_event_list);
618
619 static int trace_search_list(struct list_head **list)
620 {
621 struct trace_event *e;
622 int last = __TRACE_LAST_TYPE;
623
624 if (list_empty(&ftrace_event_list)) {
625 *list = &ftrace_event_list;
626 return last + 1;
627 }
628
629 /*
630 * We used up all possible max events,
631 * lets see if somebody freed one.
632 */
633 list_for_each_entry(e, &ftrace_event_list, list) {
634 if (e->type != last + 1)
635 break;
636 last++;
637 }
638
639 /* Did we used up all 65 thousand events??? */
640 if ((last + 1) > FTRACE_MAX_EVENT)
641 return 0;
642
643 *list = &e->list;
644 return last + 1;
645 }
646
647 void trace_event_read_lock(void)
648 {
649 down_read(&trace_event_mutex);
650 }
651
652 void trace_event_read_unlock(void)
653 {
654 up_read(&trace_event_mutex);
655 }
656
657 /**
658 * register_ftrace_event - register output for an event type
659 * @event: the event type to register
660 *
661 * Event types are stored in a hash and this hash is used to
662 * find a way to print an event. If the @event->type is set
663 * then it will use that type, otherwise it will assign a
664 * type to use.
665 *
666 * If you assign your own type, please make sure it is added
667 * to the trace_type enum in trace.h, to avoid collisions
668 * with the dynamic types.
669 *
670 * Returns the event type number or zero on error.
671 */
672 int register_ftrace_event(struct trace_event *event)
673 {
674 unsigned key;
675 int ret = 0;
676
677 down_write(&trace_event_mutex);
678
679 if (WARN_ON(!event))
680 goto out;
681
682 INIT_LIST_HEAD(&event->list);
683
684 if (!event->type) {
685 struct list_head *list = NULL;
686
687 if (next_event_type > FTRACE_MAX_EVENT) {
688
689 event->type = trace_search_list(&list);
690 if (!event->type)
691 goto out;
692
693 } else {
694
695 event->type = next_event_type++;
696 list = &ftrace_event_list;
697 }
698
699 if (WARN_ON(ftrace_find_event(event->type)))
700 goto out;
701
702 list_add_tail(&event->list, list);
703
704 } else if (event->type > __TRACE_LAST_TYPE) {
705 printk(KERN_WARNING "Need to add type to trace.h\n");
706 WARN_ON(1);
707 goto out;
708 } else {
709 /* Is this event already used */
710 if (ftrace_find_event(event->type))
711 goto out;
712 }
713
714 if (event->trace == NULL)
715 event->trace = trace_nop_print;
716 if (event->raw == NULL)
717 event->raw = trace_nop_print;
718 if (event->hex == NULL)
719 event->hex = trace_nop_print;
720 if (event->binary == NULL)
721 event->binary = trace_nop_print;
722
723 key = event->type & (EVENT_HASHSIZE - 1);
724
725 hlist_add_head(&event->node, &event_hash[key]);
726
727 ret = event->type;
728 out:
729 up_write(&trace_event_mutex);
730
731 return ret;
732 }
733 EXPORT_SYMBOL_GPL(register_ftrace_event);
734
735 /*
736 * Used by module code with the trace_event_mutex held for write.
737 */
738 int __unregister_ftrace_event(struct trace_event *event)
739 {
740 hlist_del(&event->node);
741 list_del(&event->list);
742 return 0;
743 }
744
745 /**
746 * unregister_ftrace_event - remove a no longer used event
747 * @event: the event to remove
748 */
749 int unregister_ftrace_event(struct trace_event *event)
750 {
751 down_write(&trace_event_mutex);
752 __unregister_ftrace_event(event);
753 up_write(&trace_event_mutex);
754
755 return 0;
756 }
757 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
758
759 /*
760 * Standard events
761 */
762
763 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags)
764 {
765 return TRACE_TYPE_HANDLED;
766 }
767
768 /* TRACE_FN */
769 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags)
770 {
771 struct ftrace_entry *field;
772 struct trace_seq *s = &iter->seq;
773
774 trace_assign_type(field, iter->ent);
775
776 if (!seq_print_ip_sym(s, field->ip, flags))
777 goto partial;
778
779 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
780 if (!trace_seq_printf(s, " <-"))
781 goto partial;
782 if (!seq_print_ip_sym(s,
783 field->parent_ip,
784 flags))
785 goto partial;
786 }
787 if (!trace_seq_printf(s, "\n"))
788 goto partial;
789
790 return TRACE_TYPE_HANDLED;
791
792 partial:
793 return TRACE_TYPE_PARTIAL_LINE;
794 }
795
796 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags)
797 {
798 struct ftrace_entry *field;
799
800 trace_assign_type(field, iter->ent);
801
802 if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
803 field->ip,
804 field->parent_ip))
805 return TRACE_TYPE_PARTIAL_LINE;
806
807 return TRACE_TYPE_HANDLED;
808 }
809
810 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags)
811 {
812 struct ftrace_entry *field;
813 struct trace_seq *s = &iter->seq;
814
815 trace_assign_type(field, iter->ent);
816
817 SEQ_PUT_HEX_FIELD_RET(s, field->ip);
818 SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
819
820 return TRACE_TYPE_HANDLED;
821 }
822
823 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags)
824 {
825 struct ftrace_entry *field;
826 struct trace_seq *s = &iter->seq;
827
828 trace_assign_type(field, iter->ent);
829
830 SEQ_PUT_FIELD_RET(s, field->ip);
831 SEQ_PUT_FIELD_RET(s, field->parent_ip);
832
833 return TRACE_TYPE_HANDLED;
834 }
835
836 static struct trace_event trace_fn_event = {
837 .type = TRACE_FN,
838 .trace = trace_fn_trace,
839 .raw = trace_fn_raw,
840 .hex = trace_fn_hex,
841 .binary = trace_fn_bin,
842 };
843
844 /* TRACE_CTX an TRACE_WAKE */
845 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
846 char *delim)
847 {
848 struct ctx_switch_entry *field;
849 char comm[TASK_COMM_LEN];
850 int S, T;
851
852
853 trace_assign_type(field, iter->ent);
854
855 T = task_state_char(field->next_state);
856 S = task_state_char(field->prev_state);
857 trace_find_cmdline(field->next_pid, comm);
858 if (!trace_seq_printf(&iter->seq,
859 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
860 field->prev_pid,
861 field->prev_prio,
862 S, delim,
863 field->next_cpu,
864 field->next_pid,
865 field->next_prio,
866 T, comm))
867 return TRACE_TYPE_PARTIAL_LINE;
868
869 return TRACE_TYPE_HANDLED;
870 }
871
872 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags)
873 {
874 return trace_ctxwake_print(iter, "==>");
875 }
876
877 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
878 int flags)
879 {
880 return trace_ctxwake_print(iter, " +");
881 }
882
883 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
884 {
885 struct ctx_switch_entry *field;
886 int T;
887
888 trace_assign_type(field, iter->ent);
889
890 if (!S)
891 S = task_state_char(field->prev_state);
892 T = task_state_char(field->next_state);
893 if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
894 field->prev_pid,
895 field->prev_prio,
896 S,
897 field->next_cpu,
898 field->next_pid,
899 field->next_prio,
900 T))
901 return TRACE_TYPE_PARTIAL_LINE;
902
903 return TRACE_TYPE_HANDLED;
904 }
905
906 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags)
907 {
908 return trace_ctxwake_raw(iter, 0);
909 }
910
911 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags)
912 {
913 return trace_ctxwake_raw(iter, '+');
914 }
915
916
917 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
918 {
919 struct ctx_switch_entry *field;
920 struct trace_seq *s = &iter->seq;
921 int T;
922
923 trace_assign_type(field, iter->ent);
924
925 if (!S)
926 S = task_state_char(field->prev_state);
927 T = task_state_char(field->next_state);
928
929 SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
930 SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
931 SEQ_PUT_HEX_FIELD_RET(s, S);
932 SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
933 SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
934 SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
935 SEQ_PUT_HEX_FIELD_RET(s, T);
936
937 return TRACE_TYPE_HANDLED;
938 }
939
940 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags)
941 {
942 return trace_ctxwake_hex(iter, 0);
943 }
944
945 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags)
946 {
947 return trace_ctxwake_hex(iter, '+');
948 }
949
950 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
951 int flags)
952 {
953 struct ctx_switch_entry *field;
954 struct trace_seq *s = &iter->seq;
955
956 trace_assign_type(field, iter->ent);
957
958 SEQ_PUT_FIELD_RET(s, field->prev_pid);
959 SEQ_PUT_FIELD_RET(s, field->prev_prio);
960 SEQ_PUT_FIELD_RET(s, field->prev_state);
961 SEQ_PUT_FIELD_RET(s, field->next_pid);
962 SEQ_PUT_FIELD_RET(s, field->next_prio);
963 SEQ_PUT_FIELD_RET(s, field->next_state);
964
965 return TRACE_TYPE_HANDLED;
966 }
967
968 static struct trace_event trace_ctx_event = {
969 .type = TRACE_CTX,
970 .trace = trace_ctx_print,
971 .raw = trace_ctx_raw,
972 .hex = trace_ctx_hex,
973 .binary = trace_ctxwake_bin,
974 };
975
976 static struct trace_event trace_wake_event = {
977 .type = TRACE_WAKE,
978 .trace = trace_wake_print,
979 .raw = trace_wake_raw,
980 .hex = trace_wake_hex,
981 .binary = trace_ctxwake_bin,
982 };
983
984 /* TRACE_SPECIAL */
985 static enum print_line_t trace_special_print(struct trace_iterator *iter,
986 int flags)
987 {
988 struct special_entry *field;
989
990 trace_assign_type(field, iter->ent);
991
992 if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
993 field->arg1,
994 field->arg2,
995 field->arg3))
996 return TRACE_TYPE_PARTIAL_LINE;
997
998 return TRACE_TYPE_HANDLED;
999 }
1000
1001 static enum print_line_t trace_special_hex(struct trace_iterator *iter,
1002 int flags)
1003 {
1004 struct special_entry *field;
1005 struct trace_seq *s = &iter->seq;
1006
1007 trace_assign_type(field, iter->ent);
1008
1009 SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
1010 SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
1011 SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
1012
1013 return TRACE_TYPE_HANDLED;
1014 }
1015
1016 static enum print_line_t trace_special_bin(struct trace_iterator *iter,
1017 int flags)
1018 {
1019 struct special_entry *field;
1020 struct trace_seq *s = &iter->seq;
1021
1022 trace_assign_type(field, iter->ent);
1023
1024 SEQ_PUT_FIELD_RET(s, field->arg1);
1025 SEQ_PUT_FIELD_RET(s, field->arg2);
1026 SEQ_PUT_FIELD_RET(s, field->arg3);
1027
1028 return TRACE_TYPE_HANDLED;
1029 }
1030
1031 static struct trace_event trace_special_event = {
1032 .type = TRACE_SPECIAL,
1033 .trace = trace_special_print,
1034 .raw = trace_special_print,
1035 .hex = trace_special_hex,
1036 .binary = trace_special_bin,
1037 };
1038
1039 /* TRACE_STACK */
1040
1041 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1042 int flags)
1043 {
1044 struct stack_entry *field;
1045 struct trace_seq *s = &iter->seq;
1046 int i;
1047
1048 trace_assign_type(field, iter->ent);
1049
1050 if (!trace_seq_puts(s, "<stack trace>\n"))
1051 goto partial;
1052 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1053 if (!field->caller[i] || (field->caller[i] == ULONG_MAX))
1054 break;
1055 if (!trace_seq_puts(s, " => "))
1056 goto partial;
1057
1058 if (!seq_print_ip_sym(s, field->caller[i], flags))
1059 goto partial;
1060 if (!trace_seq_puts(s, "\n"))
1061 goto partial;
1062 }
1063
1064 return TRACE_TYPE_HANDLED;
1065
1066 partial:
1067 return TRACE_TYPE_PARTIAL_LINE;
1068 }
1069
1070 static struct trace_event trace_stack_event = {
1071 .type = TRACE_STACK,
1072 .trace = trace_stack_print,
1073 .raw = trace_special_print,
1074 .hex = trace_special_hex,
1075 .binary = trace_special_bin,
1076 };
1077
1078 /* TRACE_USER_STACK */
1079 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1080 int flags)
1081 {
1082 struct userstack_entry *field;
1083 struct trace_seq *s = &iter->seq;
1084
1085 trace_assign_type(field, iter->ent);
1086
1087 if (!trace_seq_puts(s, "<user stack trace>\n"))
1088 goto partial;
1089
1090 if (!seq_print_userip_objs(field, s, flags))
1091 goto partial;
1092
1093 return TRACE_TYPE_HANDLED;
1094
1095 partial:
1096 return TRACE_TYPE_PARTIAL_LINE;
1097 }
1098
1099 static struct trace_event trace_user_stack_event = {
1100 .type = TRACE_USER_STACK,
1101 .trace = trace_user_stack_print,
1102 .raw = trace_special_print,
1103 .hex = trace_special_hex,
1104 .binary = trace_special_bin,
1105 };
1106
1107 /* TRACE_BPRINT */
1108 static enum print_line_t
1109 trace_bprint_print(struct trace_iterator *iter, int flags)
1110 {
1111 struct trace_entry *entry = iter->ent;
1112 struct trace_seq *s = &iter->seq;
1113 struct bprint_entry *field;
1114
1115 trace_assign_type(field, entry);
1116
1117 if (!seq_print_ip_sym(s, field->ip, flags))
1118 goto partial;
1119
1120 if (!trace_seq_puts(s, ": "))
1121 goto partial;
1122
1123 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1124 goto partial;
1125
1126 return TRACE_TYPE_HANDLED;
1127
1128 partial:
1129 return TRACE_TYPE_PARTIAL_LINE;
1130 }
1131
1132
1133 static enum print_line_t
1134 trace_bprint_raw(struct trace_iterator *iter, int flags)
1135 {
1136 struct bprint_entry *field;
1137 struct trace_seq *s = &iter->seq;
1138
1139 trace_assign_type(field, iter->ent);
1140
1141 if (!trace_seq_printf(s, ": %lx : ", field->ip))
1142 goto partial;
1143
1144 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1145 goto partial;
1146
1147 return TRACE_TYPE_HANDLED;
1148
1149 partial:
1150 return TRACE_TYPE_PARTIAL_LINE;
1151 }
1152
1153
1154 static struct trace_event trace_bprint_event = {
1155 .type = TRACE_BPRINT,
1156 .trace = trace_bprint_print,
1157 .raw = trace_bprint_raw,
1158 };
1159
1160 /* TRACE_PRINT */
1161 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1162 int flags)
1163 {
1164 struct print_entry *field;
1165 struct trace_seq *s = &iter->seq;
1166
1167 trace_assign_type(field, iter->ent);
1168
1169 if (!seq_print_ip_sym(s, field->ip, flags))
1170 goto partial;
1171
1172 if (!trace_seq_printf(s, ": %s", field->buf))
1173 goto partial;
1174
1175 return TRACE_TYPE_HANDLED;
1176
1177 partial:
1178 return TRACE_TYPE_PARTIAL_LINE;
1179 }
1180
1181 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
1182 {
1183 struct print_entry *field;
1184
1185 trace_assign_type(field, iter->ent);
1186
1187 if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1188 goto partial;
1189
1190 return TRACE_TYPE_HANDLED;
1191
1192 partial:
1193 return TRACE_TYPE_PARTIAL_LINE;
1194 }
1195
1196 static struct trace_event trace_print_event = {
1197 .type = TRACE_PRINT,
1198 .trace = trace_print_print,
1199 .raw = trace_print_raw,
1200 };
1201
1202
1203 static struct trace_event *events[] __initdata = {
1204 &trace_fn_event,
1205 &trace_ctx_event,
1206 &trace_wake_event,
1207 &trace_special_event,
1208 &trace_stack_event,
1209 &trace_user_stack_event,
1210 &trace_bprint_event,
1211 &trace_print_event,
1212 NULL
1213 };
1214
1215 __init static int init_events(void)
1216 {
1217 struct trace_event *event;
1218 int i, ret;
1219
1220 for (i = 0; events[i]; i++) {
1221 event = events[i];
1222
1223 ret = register_ftrace_event(event);
1224 if (!ret) {
1225 printk(KERN_WARNING "event %d failed to register\n",
1226 event->type);
1227 WARN_ON_ONCE(1);
1228 }
1229 }
1230
1231 return 0;
1232 }
1233 device_initcall(init_events);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree