projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
drm/i915: Show device capabilities in debugfs
[deliverable/linux.git] / kernel / trace / trace_output.c
1 /*
2 * trace_output.c
3 *
4 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
5 *
6 */
7
8 #include <linux/module.h>
9 #include <linux/mutex.h>
10 #include <linux/ftrace.h>
11
12 #include "trace_output.h"
13
14 /* must be a power of 2 */
15 #define EVENT_HASHSIZE 128
16
17 DECLARE_RWSEM(trace_event_mutex);
18
19 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
20
21 static int next_event_type = __TRACE_LAST_TYPE + 1;
22
23 int trace_print_seq(struct seq_file *m, struct trace_seq *s)
24 {
25 int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;
26 int ret;
27
28 ret = seq_write(m, s->buffer, len);
29
30 /*
31 * Only reset this buffer if we successfully wrote to the
32 * seq_file buffer.
33 */
34 if (!ret)
35 trace_seq_init(s);
36
37 return ret;
38 }
39
40 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
41 {
42 struct trace_seq *s = &iter->seq;
43 struct trace_entry *entry = iter->ent;
44 struct bprint_entry *field;
45 int ret;
46
47 trace_assign_type(field, entry);
48
49 ret = trace_seq_bprintf(s, field->fmt, field->buf);
50 if (!ret)
51 return TRACE_TYPE_PARTIAL_LINE;
52
53 return TRACE_TYPE_HANDLED;
54 }
55
56 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
57 {
58 struct trace_seq *s = &iter->seq;
59 struct trace_entry *entry = iter->ent;
60 struct print_entry *field;
61 int ret;
62
63 trace_assign_type(field, entry);
64
65 ret = trace_seq_printf(s, "%s", field->buf);
66 if (!ret)
67 return TRACE_TYPE_PARTIAL_LINE;
68
69 return TRACE_TYPE_HANDLED;
70 }
71
72 /**
73 * trace_seq_printf - sequence printing of trace information
74 * @s: trace sequence descriptor
75 * @fmt: printf format string
76 *
77 * It returns 0 if the trace oversizes the buffer's free
78 * space, 1 otherwise.
79 *
80 * The tracer may use either sequence operations or its own
81 * copy to user routines. To simplify formating of a trace
82 * trace_seq_printf is used to store strings into a special
83 * buffer (@s). Then the output may be either used by
84 * the sequencer or pulled into another buffer.
85 */
86 int
87 trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
88 {
89 int len = (PAGE_SIZE - 1) - s->len;
90 va_list ap;
91 int ret;
92
93 if (s->full || !len)
94 return 0;
95
96 va_start(ap, fmt);
97 ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
98 va_end(ap);
99
100 /* If we can't write it all, don't bother writing anything */
101 if (ret >= len) {
102 s->full = 1;
103 return 0;
104 }
105
106 s->len += ret;
107
108 return 1;
109 }
110 EXPORT_SYMBOL_GPL(trace_seq_printf);
111
112 /**
113 * trace_seq_vprintf - sequence printing of trace information
114 * @s: trace sequence descriptor
115 * @fmt: printf format string
116 *
117 * The tracer may use either sequence operations or its own
118 * copy to user routines. To simplify formating of a trace
119 * trace_seq_printf is used to store strings into a special
120 * buffer (@s). Then the output may be either used by
121 * the sequencer or pulled into another buffer.
122 */
123 int
124 trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
125 {
126 int len = (PAGE_SIZE - 1) - s->len;
127 int ret;
128
129 if (s->full || !len)
130 return 0;
131
132 ret = vsnprintf(s->buffer + s->len, len, fmt, args);
133
134 /* If we can't write it all, don't bother writing anything */
135 if (ret >= len) {
136 s->full = 1;
137 return 0;
138 }
139
140 s->len += ret;
141
142 return len;
143 }
144 EXPORT_SYMBOL_GPL(trace_seq_vprintf);
145
146 int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
147 {
148 int len = (PAGE_SIZE - 1) - s->len;
149 int ret;
150
151 if (s->full || !len)
152 return 0;
153
154 ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
155
156 /* If we can't write it all, don't bother writing anything */
157 if (ret >= len) {
158 s->full = 1;
159 return 0;
160 }
161
162 s->len += ret;
163
164 return len;
165 }
166
167 /**
168 * trace_seq_puts - trace sequence printing of simple string
169 * @s: trace sequence descriptor
170 * @str: simple string to record
171 *
172 * The tracer may use either the sequence operations or its own
173 * copy to user routines. This function records a simple string
174 * into a special buffer (@s) for later retrieval by a sequencer
175 * or other mechanism.
176 */
177 int trace_seq_puts(struct trace_seq *s, const char *str)
178 {
179 int len = strlen(str);
180
181 if (s->full)
182 return 0;
183
184 if (len > ((PAGE_SIZE - 1) - s->len)) {
185 s->full = 1;
186 return 0;
187 }
188
189 memcpy(s->buffer + s->len, str, len);
190 s->len += len;
191
192 return len;
193 }
194
195 int trace_seq_putc(struct trace_seq *s, unsigned char c)
196 {
197 if (s->full)
198 return 0;
199
200 if (s->len >= (PAGE_SIZE - 1)) {
201 s->full = 1;
202 return 0;
203 }
204
205 s->buffer[s->len++] = c;
206
207 return 1;
208 }
209 EXPORT_SYMBOL(trace_seq_putc);
210
211 int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
212 {
213 if (s->full)
214 return 0;
215
216 if (len > ((PAGE_SIZE - 1) - s->len)) {
217 s->full = 1;
218 return 0;
219 }
220
221 memcpy(s->buffer + s->len, mem, len);
222 s->len += len;
223
224 return len;
225 }
226
227 int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
228 {
229 unsigned char hex[HEX_CHARS];
230 const unsigned char *data = mem;
231 int i, j;
232
233 if (s->full)
234 return 0;
235
236 #ifdef __BIG_ENDIAN
237 for (i = 0, j = 0; i < len; i++) {
238 #else
239 for (i = len-1, j = 0; i >= 0; i--) {
240 #endif
241 hex[j++] = hex_asc_hi(data[i]);
242 hex[j++] = hex_asc_lo(data[i]);
243 }
244 hex[j++] = ' ';
245
246 return trace_seq_putmem(s, hex, j);
247 }
248
249 void *trace_seq_reserve(struct trace_seq *s, size_t len)
250 {
251 void *ret;
252
253 if (s->full)
254 return NULL;
255
256 if (len > ((PAGE_SIZE - 1) - s->len)) {
257 s->full = 1;
258 return NULL;
259 }
260
261 ret = s->buffer + s->len;
262 s->len += len;
263
264 return ret;
265 }
266
267 int trace_seq_path(struct trace_seq *s, struct path *path)
268 {
269 unsigned char *p;
270
271 if (s->full)
272 return 0;
273
274 if (s->len >= (PAGE_SIZE - 1)) {
275 s->full = 1;
276 return 0;
277 }
278
279 p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
280 if (!IS_ERR(p)) {
281 p = mangle_path(s->buffer + s->len, p, "\n");
282 if (p) {
283 s->len = p - s->buffer;
284 return 1;
285 }
286 } else {
287 s->buffer[s->len++] = '?';
288 return 1;
289 }
290
291 s->full = 1;
292 return 0;
293 }
294
295 const char *
296 ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
297 unsigned long flags,
298 const struct trace_print_flags *flag_array)
299 {
300 unsigned long mask;
301 const char *str;
302 const char *ret = p->buffer + p->len;
303 int i;
304
305 for (i = 0; flag_array[i].name && flags; i++) {
306
307 mask = flag_array[i].mask;
308 if ((flags & mask) != mask)
309 continue;
310
311 str = flag_array[i].name;
312 flags &= ~mask;
313 if (p->len && delim)
314 trace_seq_puts(p, delim);
315 trace_seq_puts(p, str);
316 }
317
318 /* check for left over flags */
319 if (flags) {
320 if (p->len && delim)
321 trace_seq_puts(p, delim);
322 trace_seq_printf(p, "0x%lx", flags);
323 }
324
325 trace_seq_putc(p, 0);
326
327 return ret;
328 }
329 EXPORT_SYMBOL(ftrace_print_flags_seq);
330
331 const char *
332 ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
333 const struct trace_print_flags *symbol_array)
334 {
335 int i;
336 const char *ret = p->buffer + p->len;
337
338 for (i = 0; symbol_array[i].name; i++) {
339
340 if (val != symbol_array[i].mask)
341 continue;
342
343 trace_seq_puts(p, symbol_array[i].name);
344 break;
345 }
346
347 if (!p->len)
348 trace_seq_printf(p, "0x%lx", val);
349
350 trace_seq_putc(p, 0);
351
352 return ret;
353 }
354 EXPORT_SYMBOL(ftrace_print_symbols_seq);
355
356 const char *
357 ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
358 {
359 int i;
360 const char *ret = p->buffer + p->len;
361
362 for (i = 0; i < buf_len; i++)
363 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
364
365 trace_seq_putc(p, 0);
366
367 return ret;
368 }
369 EXPORT_SYMBOL(ftrace_print_hex_seq);
370
371 #ifdef CONFIG_KRETPROBES
372 static inline const char *kretprobed(const char *name)
373 {
374 static const char tramp_name[] = "kretprobe_trampoline";
375 int size = sizeof(tramp_name);
376
377 if (strncmp(tramp_name, name, size) == 0)
378 return "[unknown/kretprobe'd]";
379 return name;
380 }
381 #else
382 static inline const char *kretprobed(const char *name)
383 {
384 return name;
385 }
386 #endif /* CONFIG_KRETPROBES */
387
388 static int
389 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
390 {
391 #ifdef CONFIG_KALLSYMS
392 char str[KSYM_SYMBOL_LEN];
393 const char *name;
394
395 kallsyms_lookup(address, NULL, NULL, NULL, str);
396
397 name = kretprobed(str);
398
399 return trace_seq_printf(s, fmt, name);
400 #endif
401 return 1;
402 }
403
404 static int
405 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
406 unsigned long address)
407 {
408 #ifdef CONFIG_KALLSYMS
409 char str[KSYM_SYMBOL_LEN];
410 const char *name;
411
412 sprint_symbol(str, address);
413 name = kretprobed(str);
414
415 return trace_seq_printf(s, fmt, name);
416 #endif
417 return 1;
418 }
419
420 #ifndef CONFIG_64BIT
421 # define IP_FMT "%08lx"
422 #else
423 # define IP_FMT "%016lx"
424 #endif
425
426 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
427 unsigned long ip, unsigned long sym_flags)
428 {
429 struct file *file = NULL;
430 unsigned long vmstart = 0;
431 int ret = 1;
432
433 if (s->full)
434 return 0;
435
436 if (mm) {
437 const struct vm_area_struct *vma;
438
439 down_read(&mm->mmap_sem);
440 vma = find_vma(mm, ip);
441 if (vma) {
442 file = vma->vm_file;
443 vmstart = vma->vm_start;
444 }
445 if (file) {
446 ret = trace_seq_path(s, &file->f_path);
447 if (ret)
448 ret = trace_seq_printf(s, "[+0x%lx]",
449 ip - vmstart);
450 }
451 up_read(&mm->mmap_sem);
452 }
453 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
454 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
455 return ret;
456 }
457
458 int
459 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
460 unsigned long sym_flags)
461 {
462 struct mm_struct *mm = NULL;
463 int ret = 1;
464 unsigned int i;
465
466 if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
467 struct task_struct *task;
468 /*
469 * we do the lookup on the thread group leader,
470 * since individual threads might have already quit!
471 */
472 rcu_read_lock();
473 task = find_task_by_vpid(entry->tgid);
474 if (task)
475 mm = get_task_mm(task);
476 rcu_read_unlock();
477 }
478
479 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
480 unsigned long ip = entry->caller[i];
481
482 if (ip == ULONG_MAX || !ret)
483 break;
484 if (ret)
485 ret = trace_seq_puts(s, " => ");
486 if (!ip) {
487 if (ret)
488 ret = trace_seq_puts(s, "??");
489 if (ret)
490 ret = trace_seq_puts(s, "\n");
491 continue;
492 }
493 if (!ret)
494 break;
495 if (ret)
496 ret = seq_print_user_ip(s, mm, ip, sym_flags);
497 ret = trace_seq_puts(s, "\n");
498 }
499
500 if (mm)
501 mmput(mm);
502 return ret;
503 }
504
505 int
506 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
507 {
508 int ret;
509
510 if (!ip)
511 return trace_seq_printf(s, "0");
512
513 if (sym_flags & TRACE_ITER_SYM_OFFSET)
514 ret = seq_print_sym_offset(s, "%s", ip);
515 else
516 ret = seq_print_sym_short(s, "%s", ip);
517
518 if (!ret)
519 return 0;
520
521 if (sym_flags & TRACE_ITER_SYM_ADDR)
522 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
523 return ret;
524 }
525
526 /**
527 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
528 * @s: trace seq struct to write to
529 * @entry: The trace entry field from the ring buffer
530 *
531 * Prints the generic fields of irqs off, in hard or softirq, preempt
532 * count and lock depth.
533 */
534 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
535 {
536 int hardirq, softirq;
537 int ret;
538
539 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
540 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
541
542 if (!trace_seq_printf(s, "%c%c%c",
543 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
544 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
545 'X' : '.',
546 (entry->flags & TRACE_FLAG_NEED_RESCHED) ?
547 'N' : '.',
548 (hardirq && softirq) ? 'H' :
549 hardirq ? 'h' : softirq ? 's' : '.'))
550 return 0;
551
552 if (entry->preempt_count)
553 ret = trace_seq_printf(s, "%x", entry->preempt_count);
554 else
555 ret = trace_seq_putc(s, '.');
556
557 if (!ret)
558 return 0;
559
560 if (entry->lock_depth < 0)
561 return trace_seq_putc(s, '.');
562
563 return trace_seq_printf(s, "%d", entry->lock_depth);
564 }
565
566 static int
567 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
568 {
569 char comm[TASK_COMM_LEN];
570
571 trace_find_cmdline(entry->pid, comm);
572
573 if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
574 comm, entry->pid, cpu))
575 return 0;
576
577 return trace_print_lat_fmt(s, entry);
578 }
579
580 static unsigned long preempt_mark_thresh = 100;
581
582 static int
583 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
584 unsigned long rel_usecs)
585 {
586 return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
587 rel_usecs > preempt_mark_thresh ? '!' :
588 rel_usecs > 1 ? '+' : ' ');
589 }
590
591 int trace_print_context(struct trace_iterator *iter)
592 {
593 struct trace_seq *s = &iter->seq;
594 struct trace_entry *entry = iter->ent;
595 unsigned long long t = ns2usecs(iter->ts);
596 unsigned long usec_rem = do_div(t, USEC_PER_SEC);
597 unsigned long secs = (unsigned long)t;
598 char comm[TASK_COMM_LEN];
599
600 trace_find_cmdline(entry->pid, comm);
601
602 return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
603 comm, entry->pid, iter->cpu, secs, usec_rem);
604 }
605
606 int trace_print_lat_context(struct trace_iterator *iter)
607 {
608 u64 next_ts;
609 int ret;
610 struct trace_seq *s = &iter->seq;
611 struct trace_entry *entry = iter->ent,
612 *next_entry = trace_find_next_entry(iter, NULL,
613 &next_ts);
614 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
615 unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
616 unsigned long rel_usecs;
617
618 if (!next_entry)
619 next_ts = iter->ts;
620 rel_usecs = ns2usecs(next_ts - iter->ts);
621
622 if (verbose) {
623 char comm[TASK_COMM_LEN];
624
625 trace_find_cmdline(entry->pid, comm);
626
627 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
628 " %ld.%03ldms (+%ld.%03ldms): ", comm,
629 entry->pid, iter->cpu, entry->flags,
630 entry->preempt_count, iter->idx,
631 ns2usecs(iter->ts),
632 abs_usecs / USEC_PER_MSEC,
633 abs_usecs % USEC_PER_MSEC,
634 rel_usecs / USEC_PER_MSEC,
635 rel_usecs % USEC_PER_MSEC);
636 } else {
637 ret = lat_print_generic(s, entry, iter->cpu);
638 if (ret)
639 ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
640 }
641
642 return ret;
643 }
644
645 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
646
647 static int task_state_char(unsigned long state)
648 {
649 int bit = state ? __ffs(state) + 1 : 0;
650
651 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
652 }
653
654 /**
655 * ftrace_find_event - find a registered event
656 * @type: the type of event to look for
657 *
658 * Returns an event of type @type otherwise NULL
659 * Called with trace_event_read_lock() held.
660 */
661 struct trace_event *ftrace_find_event(int type)
662 {
663 struct trace_event *event;
664 struct hlist_node *n;
665 unsigned key;
666
667 key = type & (EVENT_HASHSIZE - 1);
668
669 hlist_for_each_entry(event, n, &event_hash[key], node) {
670 if (event->type == type)
671 return event;
672 }
673
674 return NULL;
675 }
676
677 static LIST_HEAD(ftrace_event_list);
678
679 static int trace_search_list(struct list_head **list)
680 {
681 struct trace_event *e;
682 int last = __TRACE_LAST_TYPE;
683
684 if (list_empty(&ftrace_event_list)) {
685 *list = &ftrace_event_list;
686 return last + 1;
687 }
688
689 /*
690 * We used up all possible max events,
691 * lets see if somebody freed one.
692 */
693 list_for_each_entry(e, &ftrace_event_list, list) {
694 if (e->type != last + 1)
695 break;
696 last++;
697 }
698
699 /* Did we used up all 65 thousand events??? */
700 if ((last + 1) > FTRACE_MAX_EVENT)
701 return 0;
702
703 *list = &e->list;
704 return last + 1;
705 }
706
707 void trace_event_read_lock(void)
708 {
709 down_read(&trace_event_mutex);
710 }
711
712 void trace_event_read_unlock(void)
713 {
714 up_read(&trace_event_mutex);
715 }
716
717 /**
718 * register_ftrace_event - register output for an event type
719 * @event: the event type to register
720 *
721 * Event types are stored in a hash and this hash is used to
722 * find a way to print an event. If the @event->type is set
723 * then it will use that type, otherwise it will assign a
724 * type to use.
725 *
726 * If you assign your own type, please make sure it is added
727 * to the trace_type enum in trace.h, to avoid collisions
728 * with the dynamic types.
729 *
730 * Returns the event type number or zero on error.
731 */
732 int register_ftrace_event(struct trace_event *event)
733 {
734 unsigned key;
735 int ret = 0;
736
737 down_write(&trace_event_mutex);
738
739 if (WARN_ON(!event))
740 goto out;
741
742 if (WARN_ON(!event->funcs))
743 goto out;
744
745 INIT_LIST_HEAD(&event->list);
746
747 if (!event->type) {
748 struct list_head *list = NULL;
749
750 if (next_event_type > FTRACE_MAX_EVENT) {
751
752 event->type = trace_search_list(&list);
753 if (!event->type)
754 goto out;
755
756 } else {
757
758 event->type = next_event_type++;
759 list = &ftrace_event_list;
760 }
761
762 if (WARN_ON(ftrace_find_event(event->type)))
763 goto out;
764
765 list_add_tail(&event->list, list);
766
767 } else if (event->type > __TRACE_LAST_TYPE) {
768 printk(KERN_WARNING "Need to add type to trace.h\n");
769 WARN_ON(1);
770 goto out;
771 } else {
772 /* Is this event already used */
773 if (ftrace_find_event(event->type))
774 goto out;
775 }
776
777 if (event->funcs->trace == NULL)
778 event->funcs->trace = trace_nop_print;
779 if (event->funcs->raw == NULL)
780 event->funcs->raw = trace_nop_print;
781 if (event->funcs->hex == NULL)
782 event->funcs->hex = trace_nop_print;
783 if (event->funcs->binary == NULL)
784 event->funcs->binary = trace_nop_print;
785
786 key = event->type & (EVENT_HASHSIZE - 1);
787
788 hlist_add_head(&event->node, &event_hash[key]);
789
790 ret = event->type;
791 out:
792 up_write(&trace_event_mutex);
793
794 return ret;
795 }
796 EXPORT_SYMBOL_GPL(register_ftrace_event);
797
798 /*
799 * Used by module code with the trace_event_mutex held for write.
800 */
801 int __unregister_ftrace_event(struct trace_event *event)
802 {
803 hlist_del(&event->node);
804 list_del(&event->list);
805 return 0;
806 }
807
808 /**
809 * unregister_ftrace_event - remove a no longer used event
810 * @event: the event to remove
811 */
812 int unregister_ftrace_event(struct trace_event *event)
813 {
814 down_write(&trace_event_mutex);
815 __unregister_ftrace_event(event);
816 up_write(&trace_event_mutex);
817
818 return 0;
819 }
820 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
821
822 /*
823 * Standard events
824 */
825
826 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
827 struct trace_event *event)
828 {
829 return TRACE_TYPE_HANDLED;
830 }
831
832 /* TRACE_FN */
833 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
834 struct trace_event *event)
835 {
836 struct ftrace_entry *field;
837 struct trace_seq *s = &iter->seq;
838
839 trace_assign_type(field, iter->ent);
840
841 if (!seq_print_ip_sym(s, field->ip, flags))
842 goto partial;
843
844 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
845 if (!trace_seq_printf(s, " <-"))
846 goto partial;
847 if (!seq_print_ip_sym(s,
848 field->parent_ip,
849 flags))
850 goto partial;
851 }
852 if (!trace_seq_printf(s, "\n"))
853 goto partial;
854
855 return TRACE_TYPE_HANDLED;
856
857 partial:
858 return TRACE_TYPE_PARTIAL_LINE;
859 }
860
861 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
862 struct trace_event *event)
863 {
864 struct ftrace_entry *field;
865
866 trace_assign_type(field, iter->ent);
867
868 if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
869 field->ip,
870 field->parent_ip))
871 return TRACE_TYPE_PARTIAL_LINE;
872
873 return TRACE_TYPE_HANDLED;
874 }
875
876 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
877 struct trace_event *event)
878 {
879 struct ftrace_entry *field;
880 struct trace_seq *s = &iter->seq;
881
882 trace_assign_type(field, iter->ent);
883
884 SEQ_PUT_HEX_FIELD_RET(s, field->ip);
885 SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
886
887 return TRACE_TYPE_HANDLED;
888 }
889
890 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
891 struct trace_event *event)
892 {
893 struct ftrace_entry *field;
894 struct trace_seq *s = &iter->seq;
895
896 trace_assign_type(field, iter->ent);
897
898 SEQ_PUT_FIELD_RET(s, field->ip);
899 SEQ_PUT_FIELD_RET(s, field->parent_ip);
900
901 return TRACE_TYPE_HANDLED;
902 }
903
904 static struct trace_event_functions trace_fn_funcs = {
905 .trace = trace_fn_trace,
906 .raw = trace_fn_raw,
907 .hex = trace_fn_hex,
908 .binary = trace_fn_bin,
909 };
910
911 static struct trace_event trace_fn_event = {
912 .type = TRACE_FN,
913 .funcs = &trace_fn_funcs,
914 };
915
916 /* TRACE_CTX an TRACE_WAKE */
917 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
918 char *delim)
919 {
920 struct ctx_switch_entry *field;
921 char comm[TASK_COMM_LEN];
922 int S, T;
923
924
925 trace_assign_type(field, iter->ent);
926
927 T = task_state_char(field->next_state);
928 S = task_state_char(field->prev_state);
929 trace_find_cmdline(field->next_pid, comm);
930 if (!trace_seq_printf(&iter->seq,
931 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
932 field->prev_pid,
933 field->prev_prio,
934 S, delim,
935 field->next_cpu,
936 field->next_pid,
937 field->next_prio,
938 T, comm))
939 return TRACE_TYPE_PARTIAL_LINE;
940
941 return TRACE_TYPE_HANDLED;
942 }
943
944 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
945 struct trace_event *event)
946 {
947 return trace_ctxwake_print(iter, "==>");
948 }
949
950 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
951 int flags, struct trace_event *event)
952 {
953 return trace_ctxwake_print(iter, " +");
954 }
955
956 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
957 {
958 struct ctx_switch_entry *field;
959 int T;
960
961 trace_assign_type(field, iter->ent);
962
963 if (!S)
964 S = task_state_char(field->prev_state);
965 T = task_state_char(field->next_state);
966 if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
967 field->prev_pid,
968 field->prev_prio,
969 S,
970 field->next_cpu,
971 field->next_pid,
972 field->next_prio,
973 T))
974 return TRACE_TYPE_PARTIAL_LINE;
975
976 return TRACE_TYPE_HANDLED;
977 }
978
979 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
980 struct trace_event *event)
981 {
982 return trace_ctxwake_raw(iter, 0);
983 }
984
985 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
986 struct trace_event *event)
987 {
988 return trace_ctxwake_raw(iter, '+');
989 }
990
991
992 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
993 {
994 struct ctx_switch_entry *field;
995 struct trace_seq *s = &iter->seq;
996 int T;
997
998 trace_assign_type(field, iter->ent);
999
1000 if (!S)
1001 S = task_state_char(field->prev_state);
1002 T = task_state_char(field->next_state);
1003
1004 SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
1005 SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
1006 SEQ_PUT_HEX_FIELD_RET(s, S);
1007 SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
1008 SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
1009 SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
1010 SEQ_PUT_HEX_FIELD_RET(s, T);
1011
1012 return TRACE_TYPE_HANDLED;
1013 }
1014
1015 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1016 struct trace_event *event)
1017 {
1018 return trace_ctxwake_hex(iter, 0);
1019 }
1020
1021 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1022 struct trace_event *event)
1023 {
1024 return trace_ctxwake_hex(iter, '+');
1025 }
1026
1027 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1028 int flags, struct trace_event *event)
1029 {
1030 struct ctx_switch_entry *field;
1031 struct trace_seq *s = &iter->seq;
1032
1033 trace_assign_type(field, iter->ent);
1034
1035 SEQ_PUT_FIELD_RET(s, field->prev_pid);
1036 SEQ_PUT_FIELD_RET(s, field->prev_prio);
1037 SEQ_PUT_FIELD_RET(s, field->prev_state);
1038 SEQ_PUT_FIELD_RET(s, field->next_pid);
1039 SEQ_PUT_FIELD_RET(s, field->next_prio);
1040 SEQ_PUT_FIELD_RET(s, field->next_state);
1041
1042 return TRACE_TYPE_HANDLED;
1043 }
1044
1045 static struct trace_event_functions trace_ctx_funcs = {
1046 .trace = trace_ctx_print,
1047 .raw = trace_ctx_raw,
1048 .hex = trace_ctx_hex,
1049 .binary = trace_ctxwake_bin,
1050 };
1051
1052 static struct trace_event trace_ctx_event = {
1053 .type = TRACE_CTX,
1054 .funcs = &trace_ctx_funcs,
1055 };
1056
1057 static struct trace_event_functions trace_wake_funcs = {
1058 .trace = trace_wake_print,
1059 .raw = trace_wake_raw,
1060 .hex = trace_wake_hex,
1061 .binary = trace_ctxwake_bin,
1062 };
1063
1064 static struct trace_event trace_wake_event = {
1065 .type = TRACE_WAKE,
1066 .funcs = &trace_wake_funcs,
1067 };
1068
1069 /* TRACE_STACK */
1070
1071 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1072 int flags, struct trace_event *event)
1073 {
1074 struct stack_entry *field;
1075 struct trace_seq *s = &iter->seq;
1076 int i;
1077
1078 trace_assign_type(field, iter->ent);
1079
1080 if (!trace_seq_puts(s, "<stack trace>\n"))
1081 goto partial;
1082 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1083 if (!field->caller[i] || (field->caller[i] == ULONG_MAX))
1084 break;
1085 if (!trace_seq_puts(s, " => "))
1086 goto partial;
1087
1088 if (!seq_print_ip_sym(s, field->caller[i], flags))
1089 goto partial;
1090 if (!trace_seq_puts(s, "\n"))
1091 goto partial;
1092 }
1093
1094 return TRACE_TYPE_HANDLED;
1095
1096 partial:
1097 return TRACE_TYPE_PARTIAL_LINE;
1098 }
1099
1100 static struct trace_event_functions trace_stack_funcs = {
1101 .trace = trace_stack_print,
1102 };
1103
1104 static struct trace_event trace_stack_event = {
1105 .type = TRACE_STACK,
1106 .funcs = &trace_stack_funcs,
1107 };
1108
1109 /* TRACE_USER_STACK */
1110 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1111 int flags, struct trace_event *event)
1112 {
1113 struct userstack_entry *field;
1114 struct trace_seq *s = &iter->seq;
1115
1116 trace_assign_type(field, iter->ent);
1117
1118 if (!trace_seq_puts(s, "<user stack trace>\n"))
1119 goto partial;
1120
1121 if (!seq_print_userip_objs(field, s, flags))
1122 goto partial;
1123
1124 return TRACE_TYPE_HANDLED;
1125
1126 partial:
1127 return TRACE_TYPE_PARTIAL_LINE;
1128 }
1129
1130 static struct trace_event_functions trace_user_stack_funcs = {
1131 .trace = trace_user_stack_print,
1132 };
1133
1134 static struct trace_event trace_user_stack_event = {
1135 .type = TRACE_USER_STACK,
1136 .funcs = &trace_user_stack_funcs,
1137 };
1138
1139 /* TRACE_BPRINT */
1140 static enum print_line_t
1141 trace_bprint_print(struct trace_iterator *iter, int flags,
1142 struct trace_event *event)
1143 {
1144 struct trace_entry *entry = iter->ent;
1145 struct trace_seq *s = &iter->seq;
1146 struct bprint_entry *field;
1147
1148 trace_assign_type(field, entry);
1149
1150 if (!seq_print_ip_sym(s, field->ip, flags))
1151 goto partial;
1152
1153 if (!trace_seq_puts(s, ": "))
1154 goto partial;
1155
1156 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1157 goto partial;
1158
1159 return TRACE_TYPE_HANDLED;
1160
1161 partial:
1162 return TRACE_TYPE_PARTIAL_LINE;
1163 }
1164
1165
1166 static enum print_line_t
1167 trace_bprint_raw(struct trace_iterator *iter, int flags,
1168 struct trace_event *event)
1169 {
1170 struct bprint_entry *field;
1171 struct trace_seq *s = &iter->seq;
1172
1173 trace_assign_type(field, iter->ent);
1174
1175 if (!trace_seq_printf(s, ": %lx : ", field->ip))
1176 goto partial;
1177
1178 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1179 goto partial;
1180
1181 return TRACE_TYPE_HANDLED;
1182
1183 partial:
1184 return TRACE_TYPE_PARTIAL_LINE;
1185 }
1186
1187 static struct trace_event_functions trace_bprint_funcs = {
1188 .trace = trace_bprint_print,
1189 .raw = trace_bprint_raw,
1190 };
1191
1192 static struct trace_event trace_bprint_event = {
1193 .type = TRACE_BPRINT,
1194 .funcs = &trace_bprint_funcs,
1195 };
1196
1197 /* TRACE_PRINT */
1198 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1199 int flags, struct trace_event *event)
1200 {
1201 struct print_entry *field;
1202 struct trace_seq *s = &iter->seq;
1203
1204 trace_assign_type(field, iter->ent);
1205
1206 if (!seq_print_ip_sym(s, field->ip, flags))
1207 goto partial;
1208
1209 if (!trace_seq_printf(s, ": %s", field->buf))
1210 goto partial;
1211
1212 return TRACE_TYPE_HANDLED;
1213
1214 partial:
1215 return TRACE_TYPE_PARTIAL_LINE;
1216 }
1217
1218 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1219 struct trace_event *event)
1220 {
1221 struct print_entry *field;
1222
1223 trace_assign_type(field, iter->ent);
1224
1225 if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1226 goto partial;
1227
1228 return TRACE_TYPE_HANDLED;
1229
1230 partial:
1231 return TRACE_TYPE_PARTIAL_LINE;
1232 }
1233
1234 static struct trace_event_functions trace_print_funcs = {
1235 .trace = trace_print_print,
1236 .raw = trace_print_raw,
1237 };
1238
1239 static struct trace_event trace_print_event = {
1240 .type = TRACE_PRINT,
1241 .funcs = &trace_print_funcs,
1242 };
1243
1244
1245 static struct trace_event *events[] __initdata = {
1246 &trace_fn_event,
1247 &trace_ctx_event,
1248 &trace_wake_event,
1249 &trace_stack_event,
1250 &trace_user_stack_event,
1251 &trace_bprint_event,
1252 &trace_print_event,
1253 NULL
1254 };
1255
1256 __init static int init_events(void)
1257 {
1258 struct trace_event *event;
1259 int i, ret;
1260
1261 for (i = 0; events[i]; i++) {
1262 event = events[i];
1263
1264 ret = register_ftrace_event(event);
1265 if (!ret) {
1266 printk(KERN_WARNING "event %d failed to register\n",
1267 event->type);
1268 WARN_ON_ONCE(1);
1269 }
1270 }
1271
1272 return 0;
1273 }
1274 device_initcall(init_events);
Linux kernel - Deliverables
This page took 0.08175 seconds and 5 git commands to generate.