Loading...
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
17DECLARE_RWSEM(trace_event_sem);
18
19static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
20
21static int next_event_type = __TRACE_LAST_TYPE + 1;
22
23enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
24{
25 struct trace_seq *s = &iter->seq;
26 struct trace_entry *entry = iter->ent;
27 struct bputs_entry *field;
28
29 trace_assign_type(field, entry);
30
31 trace_seq_puts(s, field->str);
32
33 return trace_handle_return(s);
34}
35
36enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
37{
38 struct trace_seq *s = &iter->seq;
39 struct trace_entry *entry = iter->ent;
40 struct bprint_entry *field;
41
42 trace_assign_type(field, entry);
43
44 trace_seq_bprintf(s, field->fmt, field->buf);
45
46 return trace_handle_return(s);
47}
48
49enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
50{
51 struct trace_seq *s = &iter->seq;
52 struct trace_entry *entry = iter->ent;
53 struct print_entry *field;
54
55 trace_assign_type(field, entry);
56
57 trace_seq_puts(s, field->buf);
58
59 return trace_handle_return(s);
60}
61
62const char *
63trace_print_flags_seq(struct trace_seq *p, const char *delim,
64 unsigned long flags,
65 const struct trace_print_flags *flag_array)
66{
67 unsigned long mask;
68 const char *str;
69 const char *ret = trace_seq_buffer_ptr(p);
70 int i, first = 1;
71
72 for (i = 0; flag_array[i].name && flags; i++) {
73
74 mask = flag_array[i].mask;
75 if ((flags & mask) != mask)
76 continue;
77
78 str = flag_array[i].name;
79 flags &= ~mask;
80 if (!first && delim)
81 trace_seq_puts(p, delim);
82 else
83 first = 0;
84 trace_seq_puts(p, str);
85 }
86
87 /* check for left over flags */
88 if (flags) {
89 if (!first && delim)
90 trace_seq_puts(p, delim);
91 trace_seq_printf(p, "0x%lx", flags);
92 }
93
94 trace_seq_putc(p, 0);
95
96 return ret;
97}
98EXPORT_SYMBOL(trace_print_flags_seq);
99
100const char *
101trace_print_symbols_seq(struct trace_seq *p, unsigned long val,
102 const struct trace_print_flags *symbol_array)
103{
104 int i;
105 const char *ret = trace_seq_buffer_ptr(p);
106
107 for (i = 0; symbol_array[i].name; i++) {
108
109 if (val != symbol_array[i].mask)
110 continue;
111
112 trace_seq_puts(p, symbol_array[i].name);
113 break;
114 }
115
116 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
117 trace_seq_printf(p, "0x%lx", val);
118
119 trace_seq_putc(p, 0);
120
121 return ret;
122}
123EXPORT_SYMBOL(trace_print_symbols_seq);
124
125#if BITS_PER_LONG == 32
126const char *
127trace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
128 const struct trace_print_flags_u64 *symbol_array)
129{
130 int i;
131 const char *ret = trace_seq_buffer_ptr(p);
132
133 for (i = 0; symbol_array[i].name; i++) {
134
135 if (val != symbol_array[i].mask)
136 continue;
137
138 trace_seq_puts(p, symbol_array[i].name);
139 break;
140 }
141
142 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
143 trace_seq_printf(p, "0x%llx", val);
144
145 trace_seq_putc(p, 0);
146
147 return ret;
148}
149EXPORT_SYMBOL(trace_print_symbols_seq_u64);
150#endif
151
152const char *
153trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
154 unsigned int bitmask_size)
155{
156 const char *ret = trace_seq_buffer_ptr(p);
157
158 trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8);
159 trace_seq_putc(p, 0);
160
161 return ret;
162}
163EXPORT_SYMBOL_GPL(trace_print_bitmask_seq);
164
165const char *
166trace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
167{
168 int i;
169 const char *ret = trace_seq_buffer_ptr(p);
170
171 for (i = 0; i < buf_len; i++)
172 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
173
174 trace_seq_putc(p, 0);
175
176 return ret;
177}
178EXPORT_SYMBOL(trace_print_hex_seq);
179
180const char *
181trace_print_array_seq(struct trace_seq *p, const void *buf, int count,
182 size_t el_size)
183{
184 const char *ret = trace_seq_buffer_ptr(p);
185 const char *prefix = "";
186 void *ptr = (void *)buf;
187 size_t buf_len = count * el_size;
188
189 trace_seq_putc(p, '{');
190
191 while (ptr < buf + buf_len) {
192 switch (el_size) {
193 case 1:
194 trace_seq_printf(p, "%s0x%x", prefix,
195 *(u8 *)ptr);
196 break;
197 case 2:
198 trace_seq_printf(p, "%s0x%x", prefix,
199 *(u16 *)ptr);
200 break;
201 case 4:
202 trace_seq_printf(p, "%s0x%x", prefix,
203 *(u32 *)ptr);
204 break;
205 case 8:
206 trace_seq_printf(p, "%s0x%llx", prefix,
207 *(u64 *)ptr);
208 break;
209 default:
210 trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
211 *(u8 *)ptr);
212 el_size = 1;
213 }
214 prefix = ",";
215 ptr += el_size;
216 }
217
218 trace_seq_putc(p, '}');
219 trace_seq_putc(p, 0);
220
221 return ret;
222}
223EXPORT_SYMBOL(trace_print_array_seq);
224
225int trace_raw_output_prep(struct trace_iterator *iter,
226 struct trace_event *trace_event)
227{
228 struct trace_event_call *event;
229 struct trace_seq *s = &iter->seq;
230 struct trace_seq *p = &iter->tmp_seq;
231 struct trace_entry *entry;
232
233 event = container_of(trace_event, struct trace_event_call, event);
234 entry = iter->ent;
235
236 if (entry->type != event->event.type) {
237 WARN_ON_ONCE(1);
238 return TRACE_TYPE_UNHANDLED;
239 }
240
241 trace_seq_init(p);
242 trace_seq_printf(s, "%s: ", trace_event_name(event));
243
244 return trace_handle_return(s);
245}
246EXPORT_SYMBOL(trace_raw_output_prep);
247
248static int trace_output_raw(struct trace_iterator *iter, char *name,
249 char *fmt, va_list ap)
250{
251 struct trace_seq *s = &iter->seq;
252
253 trace_seq_printf(s, "%s: ", name);
254 trace_seq_vprintf(s, fmt, ap);
255
256 return trace_handle_return(s);
257}
258
259int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
260{
261 va_list ap;
262 int ret;
263
264 va_start(ap, fmt);
265 ret = trace_output_raw(iter, name, fmt, ap);
266 va_end(ap);
267
268 return ret;
269}
270EXPORT_SYMBOL_GPL(trace_output_call);
271
272#ifdef CONFIG_KRETPROBES
273static inline const char *kretprobed(const char *name)
274{
275 static const char tramp_name[] = "kretprobe_trampoline";
276 int size = sizeof(tramp_name);
277
278 if (strncmp(tramp_name, name, size) == 0)
279 return "[unknown/kretprobe'd]";
280 return name;
281}
282#else
283static inline const char *kretprobed(const char *name)
284{
285 return name;
286}
287#endif /* CONFIG_KRETPROBES */
288
289static void
290seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
291{
292#ifdef CONFIG_KALLSYMS
293 char str[KSYM_SYMBOL_LEN];
294 const char *name;
295
296 kallsyms_lookup(address, NULL, NULL, NULL, str);
297
298 name = kretprobed(str);
299
300 trace_seq_printf(s, fmt, name);
301#endif
302}
303
304static void
305seq_print_sym_offset(struct trace_seq *s, const char *fmt,
306 unsigned long address)
307{
308#ifdef CONFIG_KALLSYMS
309 char str[KSYM_SYMBOL_LEN];
310 const char *name;
311
312 sprint_symbol(str, address);
313 name = kretprobed(str);
314
315 trace_seq_printf(s, fmt, name);
316#endif
317}
318
319#ifndef CONFIG_64BIT
320# define IP_FMT "%08lx"
321#else
322# define IP_FMT "%016lx"
323#endif
324
325static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
326 unsigned long ip, unsigned long sym_flags)
327{
328 struct file *file = NULL;
329 unsigned long vmstart = 0;
330 int ret = 1;
331
332 if (s->full)
333 return 0;
334
335 if (mm) {
336 const struct vm_area_struct *vma;
337
338 down_read(&mm->mmap_sem);
339 vma = find_vma(mm, ip);
340 if (vma) {
341 file = vma->vm_file;
342 vmstart = vma->vm_start;
343 }
344 if (file) {
345 ret = trace_seq_path(s, &file->f_path);
346 if (ret)
347 trace_seq_printf(s, "[+0x%lx]",
348 ip - vmstart);
349 }
350 up_read(&mm->mmap_sem);
351 }
352 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
353 trace_seq_printf(s, " <" IP_FMT ">", ip);
354 return !trace_seq_has_overflowed(s);
355}
356
357int
358seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
359{
360 if (!ip) {
361 trace_seq_putc(s, '0');
362 goto out;
363 }
364
365 if (sym_flags & TRACE_ITER_SYM_OFFSET)
366 seq_print_sym_offset(s, "%s", ip);
367 else
368 seq_print_sym_short(s, "%s", ip);
369
370 if (sym_flags & TRACE_ITER_SYM_ADDR)
371 trace_seq_printf(s, " <" IP_FMT ">", ip);
372
373 out:
374 return !trace_seq_has_overflowed(s);
375}
376
377/**
378 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
379 * @s: trace seq struct to write to
380 * @entry: The trace entry field from the ring buffer
381 *
382 * Prints the generic fields of irqs off, in hard or softirq, preempt
383 * count.
384 */
385int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
386{
387 char hardsoft_irq;
388 char need_resched;
389 char irqs_off;
390 int hardirq;
391 int softirq;
392 int nmi;
393
394 nmi = entry->flags & TRACE_FLAG_NMI;
395 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
396 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
397
398 irqs_off =
399 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
400 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
401 '.';
402
403 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
404 TRACE_FLAG_PREEMPT_RESCHED)) {
405 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
406 need_resched = 'N';
407 break;
408 case TRACE_FLAG_NEED_RESCHED:
409 need_resched = 'n';
410 break;
411 case TRACE_FLAG_PREEMPT_RESCHED:
412 need_resched = 'p';
413 break;
414 default:
415 need_resched = '.';
416 break;
417 }
418
419 hardsoft_irq =
420 (nmi && hardirq) ? 'Z' :
421 nmi ? 'z' :
422 (hardirq && softirq) ? 'H' :
423 hardirq ? 'h' :
424 softirq ? 's' :
425 '.' ;
426
427 trace_seq_printf(s, "%c%c%c",
428 irqs_off, need_resched, hardsoft_irq);
429
430 if (entry->preempt_count)
431 trace_seq_printf(s, "%x", entry->preempt_count);
432 else
433 trace_seq_putc(s, '.');
434
435 return !trace_seq_has_overflowed(s);
436}
437
438static int
439lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
440{
441 char comm[TASK_COMM_LEN];
442
443 trace_find_cmdline(entry->pid, comm);
444
445 trace_seq_printf(s, "%8.8s-%-5d %3d",
446 comm, entry->pid, cpu);
447
448 return trace_print_lat_fmt(s, entry);
449}
450
451#undef MARK
452#define MARK(v, s) {.val = v, .sym = s}
453/* trace overhead mark */
454static const struct trace_mark {
455 unsigned long long val; /* unit: nsec */
456 char sym;
457} mark[] = {
458 MARK(1000000000ULL , '$'), /* 1 sec */
459 MARK(100000000ULL , '@'), /* 100 msec */
460 MARK(10000000ULL , '*'), /* 10 msec */
461 MARK(1000000ULL , '#'), /* 1000 usecs */
462 MARK(100000ULL , '!'), /* 100 usecs */
463 MARK(10000ULL , '+'), /* 10 usecs */
464};
465#undef MARK
466
467char trace_find_mark(unsigned long long d)
468{
469 int i;
470 int size = ARRAY_SIZE(mark);
471
472 for (i = 0; i < size; i++) {
473 if (d > mark[i].val)
474 break;
475 }
476
477 return (i == size) ? ' ' : mark[i].sym;
478}
479
480static int
481lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
482{
483 struct trace_array *tr = iter->tr;
484 unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
485 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
486 unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start;
487 unsigned long long rel_ts = next_ts - iter->ts;
488 struct trace_seq *s = &iter->seq;
489
490 if (in_ns) {
491 abs_ts = ns2usecs(abs_ts);
492 rel_ts = ns2usecs(rel_ts);
493 }
494
495 if (verbose && in_ns) {
496 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
497 unsigned long abs_msec = (unsigned long)abs_ts;
498 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
499 unsigned long rel_msec = (unsigned long)rel_ts;
500
501 trace_seq_printf(
502 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
503 ns2usecs(iter->ts),
504 abs_msec, abs_usec,
505 rel_msec, rel_usec);
506
507 } else if (verbose && !in_ns) {
508 trace_seq_printf(
509 s, "[%016llx] %lld (+%lld): ",
510 iter->ts, abs_ts, rel_ts);
511
512 } else if (!verbose && in_ns) {
513 trace_seq_printf(
514 s, " %4lldus%c: ",
515 abs_ts,
516 trace_find_mark(rel_ts * NSEC_PER_USEC));
517
518 } else { /* !verbose && !in_ns */
519 trace_seq_printf(s, " %4lld: ", abs_ts);
520 }
521
522 return !trace_seq_has_overflowed(s);
523}
524
525int trace_print_context(struct trace_iterator *iter)
526{
527 struct trace_array *tr = iter->tr;
528 struct trace_seq *s = &iter->seq;
529 struct trace_entry *entry = iter->ent;
530 unsigned long long t;
531 unsigned long secs, usec_rem;
532 char comm[TASK_COMM_LEN];
533
534 trace_find_cmdline(entry->pid, comm);
535
536 trace_seq_printf(s, "%16s-%-5d [%03d] ",
537 comm, entry->pid, iter->cpu);
538
539 if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
540 trace_print_lat_fmt(s, entry);
541
542 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
543 t = ns2usecs(iter->ts);
544 usec_rem = do_div(t, USEC_PER_SEC);
545 secs = (unsigned long)t;
546 trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
547 } else
548 trace_seq_printf(s, " %12llu: ", iter->ts);
549
550 return !trace_seq_has_overflowed(s);
551}
552
553int trace_print_lat_context(struct trace_iterator *iter)
554{
555 struct trace_array *tr = iter->tr;
556 /* trace_find_next_entry will reset ent_size */
557 int ent_size = iter->ent_size;
558 struct trace_seq *s = &iter->seq;
559 u64 next_ts;
560 struct trace_entry *entry = iter->ent,
561 *next_entry = trace_find_next_entry(iter, NULL,
562 &next_ts);
563 unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
564
565 /* Restore the original ent_size */
566 iter->ent_size = ent_size;
567
568 if (!next_entry)
569 next_ts = iter->ts;
570
571 if (verbose) {
572 char comm[TASK_COMM_LEN];
573
574 trace_find_cmdline(entry->pid, comm);
575
576 trace_seq_printf(
577 s, "%16s %5d %3d %d %08x %08lx ",
578 comm, entry->pid, iter->cpu, entry->flags,
579 entry->preempt_count, iter->idx);
580 } else {
581 lat_print_generic(s, entry, iter->cpu);
582 }
583
584 lat_print_timestamp(iter, next_ts);
585
586 return !trace_seq_has_overflowed(s);
587}
588
589static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
590
591static int task_state_char(unsigned long state)
592{
593 int bit = state ? __ffs(state) + 1 : 0;
594
595 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
596}
597
598/**
599 * ftrace_find_event - find a registered event
600 * @type: the type of event to look for
601 *
602 * Returns an event of type @type otherwise NULL
603 * Called with trace_event_read_lock() held.
604 */
605struct trace_event *ftrace_find_event(int type)
606{
607 struct trace_event *event;
608 unsigned key;
609
610 key = type & (EVENT_HASHSIZE - 1);
611
612 hlist_for_each_entry(event, &event_hash[key], node) {
613 if (event->type == type)
614 return event;
615 }
616
617 return NULL;
618}
619
620static LIST_HEAD(ftrace_event_list);
621
622static int trace_search_list(struct list_head **list)
623{
624 struct trace_event *e;
625 int last = __TRACE_LAST_TYPE;
626
627 if (list_empty(&ftrace_event_list)) {
628 *list = &ftrace_event_list;
629 return last + 1;
630 }
631
632 /*
633 * We used up all possible max events,
634 * lets see if somebody freed one.
635 */
636 list_for_each_entry(e, &ftrace_event_list, list) {
637 if (e->type != last + 1)
638 break;
639 last++;
640 }
641
642 /* Did we used up all 65 thousand events??? */
643 if ((last + 1) > TRACE_EVENT_TYPE_MAX)
644 return 0;
645
646 *list = &e->list;
647 return last + 1;
648}
649
650void trace_event_read_lock(void)
651{
652 down_read(&trace_event_sem);
653}
654
655void trace_event_read_unlock(void)
656{
657 up_read(&trace_event_sem);
658}
659
660/**
661 * register_trace_event - register output for an event type
662 * @event: the event type to register
663 *
664 * Event types are stored in a hash and this hash is used to
665 * find a way to print an event. If the @event->type is set
666 * then it will use that type, otherwise it will assign a
667 * type to use.
668 *
669 * If you assign your own type, please make sure it is added
670 * to the trace_type enum in trace.h, to avoid collisions
671 * with the dynamic types.
672 *
673 * Returns the event type number or zero on error.
674 */
675int register_trace_event(struct trace_event *event)
676{
677 unsigned key;
678 int ret = 0;
679
680 down_write(&trace_event_sem);
681
682 if (WARN_ON(!event))
683 goto out;
684
685 if (WARN_ON(!event->funcs))
686 goto out;
687
688 INIT_LIST_HEAD(&event->list);
689
690 if (!event->type) {
691 struct list_head *list = NULL;
692
693 if (next_event_type > TRACE_EVENT_TYPE_MAX) {
694
695 event->type = trace_search_list(&list);
696 if (!event->type)
697 goto out;
698
699 } else {
700
701 event->type = next_event_type++;
702 list = &ftrace_event_list;
703 }
704
705 if (WARN_ON(ftrace_find_event(event->type)))
706 goto out;
707
708 list_add_tail(&event->list, list);
709
710 } else if (event->type > __TRACE_LAST_TYPE) {
711 printk(KERN_WARNING "Need to add type to trace.h\n");
712 WARN_ON(1);
713 goto out;
714 } else {
715 /* Is this event already used */
716 if (ftrace_find_event(event->type))
717 goto out;
718 }
719
720 if (event->funcs->trace == NULL)
721 event->funcs->trace = trace_nop_print;
722 if (event->funcs->raw == NULL)
723 event->funcs->raw = trace_nop_print;
724 if (event->funcs->hex == NULL)
725 event->funcs->hex = trace_nop_print;
726 if (event->funcs->binary == NULL)
727 event->funcs->binary = trace_nop_print;
728
729 key = event->type & (EVENT_HASHSIZE - 1);
730
731 hlist_add_head(&event->node, &event_hash[key]);
732
733 ret = event->type;
734 out:
735 up_write(&trace_event_sem);
736
737 return ret;
738}
739EXPORT_SYMBOL_GPL(register_trace_event);
740
741/*
742 * Used by module code with the trace_event_sem held for write.
743 */
744int __unregister_trace_event(struct trace_event *event)
745{
746 hlist_del(&event->node);
747 list_del(&event->list);
748 return 0;
749}
750
751/**
752 * unregister_trace_event - remove a no longer used event
753 * @event: the event to remove
754 */
755int unregister_trace_event(struct trace_event *event)
756{
757 down_write(&trace_event_sem);
758 __unregister_trace_event(event);
759 up_write(&trace_event_sem);
760
761 return 0;
762}
763EXPORT_SYMBOL_GPL(unregister_trace_event);
764
765/*
766 * Standard events
767 */
768
769enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
770 struct trace_event *event)
771{
772 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
773
774 return trace_handle_return(&iter->seq);
775}
776
777/* TRACE_FN */
778static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
779 struct trace_event *event)
780{
781 struct ftrace_entry *field;
782 struct trace_seq *s = &iter->seq;
783
784 trace_assign_type(field, iter->ent);
785
786 seq_print_ip_sym(s, field->ip, flags);
787
788 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
789 trace_seq_puts(s, " <-");
790 seq_print_ip_sym(s, field->parent_ip, flags);
791 }
792
793 trace_seq_putc(s, '\n');
794
795 return trace_handle_return(s);
796}
797
798static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
799 struct trace_event *event)
800{
801 struct ftrace_entry *field;
802
803 trace_assign_type(field, iter->ent);
804
805 trace_seq_printf(&iter->seq, "%lx %lx\n",
806 field->ip,
807 field->parent_ip);
808
809 return trace_handle_return(&iter->seq);
810}
811
812static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
813 struct trace_event *event)
814{
815 struct ftrace_entry *field;
816 struct trace_seq *s = &iter->seq;
817
818 trace_assign_type(field, iter->ent);
819
820 SEQ_PUT_HEX_FIELD(s, field->ip);
821 SEQ_PUT_HEX_FIELD(s, field->parent_ip);
822
823 return trace_handle_return(s);
824}
825
826static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
827 struct trace_event *event)
828{
829 struct ftrace_entry *field;
830 struct trace_seq *s = &iter->seq;
831
832 trace_assign_type(field, iter->ent);
833
834 SEQ_PUT_FIELD(s, field->ip);
835 SEQ_PUT_FIELD(s, field->parent_ip);
836
837 return trace_handle_return(s);
838}
839
840static struct trace_event_functions trace_fn_funcs = {
841 .trace = trace_fn_trace,
842 .raw = trace_fn_raw,
843 .hex = trace_fn_hex,
844 .binary = trace_fn_bin,
845};
846
847static struct trace_event trace_fn_event = {
848 .type = TRACE_FN,
849 .funcs = &trace_fn_funcs,
850};
851
852/* TRACE_CTX an TRACE_WAKE */
853static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
854 char *delim)
855{
856 struct ctx_switch_entry *field;
857 char comm[TASK_COMM_LEN];
858 int S, T;
859
860
861 trace_assign_type(field, iter->ent);
862
863 T = task_state_char(field->next_state);
864 S = task_state_char(field->prev_state);
865 trace_find_cmdline(field->next_pid, comm);
866 trace_seq_printf(&iter->seq,
867 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
868 field->prev_pid,
869 field->prev_prio,
870 S, delim,
871 field->next_cpu,
872 field->next_pid,
873 field->next_prio,
874 T, comm);
875
876 return trace_handle_return(&iter->seq);
877}
878
879static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
880 struct trace_event *event)
881{
882 return trace_ctxwake_print(iter, "==>");
883}
884
885static enum print_line_t trace_wake_print(struct trace_iterator *iter,
886 int flags, struct trace_event *event)
887{
888 return trace_ctxwake_print(iter, " +");
889}
890
891static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
892{
893 struct ctx_switch_entry *field;
894 int T;
895
896 trace_assign_type(field, iter->ent);
897
898 if (!S)
899 S = task_state_char(field->prev_state);
900 T = task_state_char(field->next_state);
901 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
902 field->prev_pid,
903 field->prev_prio,
904 S,
905 field->next_cpu,
906 field->next_pid,
907 field->next_prio,
908 T);
909
910 return trace_handle_return(&iter->seq);
911}
912
913static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
914 struct trace_event *event)
915{
916 return trace_ctxwake_raw(iter, 0);
917}
918
919static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
920 struct trace_event *event)
921{
922 return trace_ctxwake_raw(iter, '+');
923}
924
925
926static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
927{
928 struct ctx_switch_entry *field;
929 struct trace_seq *s = &iter->seq;
930 int T;
931
932 trace_assign_type(field, iter->ent);
933
934 if (!S)
935 S = task_state_char(field->prev_state);
936 T = task_state_char(field->next_state);
937
938 SEQ_PUT_HEX_FIELD(s, field->prev_pid);
939 SEQ_PUT_HEX_FIELD(s, field->prev_prio);
940 SEQ_PUT_HEX_FIELD(s, S);
941 SEQ_PUT_HEX_FIELD(s, field->next_cpu);
942 SEQ_PUT_HEX_FIELD(s, field->next_pid);
943 SEQ_PUT_HEX_FIELD(s, field->next_prio);
944 SEQ_PUT_HEX_FIELD(s, T);
945
946 return trace_handle_return(s);
947}
948
949static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
950 struct trace_event *event)
951{
952 return trace_ctxwake_hex(iter, 0);
953}
954
955static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
956 struct trace_event *event)
957{
958 return trace_ctxwake_hex(iter, '+');
959}
960
961static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
962 int flags, struct trace_event *event)
963{
964 struct ctx_switch_entry *field;
965 struct trace_seq *s = &iter->seq;
966
967 trace_assign_type(field, iter->ent);
968
969 SEQ_PUT_FIELD(s, field->prev_pid);
970 SEQ_PUT_FIELD(s, field->prev_prio);
971 SEQ_PUT_FIELD(s, field->prev_state);
972 SEQ_PUT_FIELD(s, field->next_cpu);
973 SEQ_PUT_FIELD(s, field->next_pid);
974 SEQ_PUT_FIELD(s, field->next_prio);
975 SEQ_PUT_FIELD(s, field->next_state);
976
977 return trace_handle_return(s);
978}
979
980static struct trace_event_functions trace_ctx_funcs = {
981 .trace = trace_ctx_print,
982 .raw = trace_ctx_raw,
983 .hex = trace_ctx_hex,
984 .binary = trace_ctxwake_bin,
985};
986
987static struct trace_event trace_ctx_event = {
988 .type = TRACE_CTX,
989 .funcs = &trace_ctx_funcs,
990};
991
992static struct trace_event_functions trace_wake_funcs = {
993 .trace = trace_wake_print,
994 .raw = trace_wake_raw,
995 .hex = trace_wake_hex,
996 .binary = trace_ctxwake_bin,
997};
998
999static struct trace_event trace_wake_event = {
1000 .type = TRACE_WAKE,
1001 .funcs = &trace_wake_funcs,
1002};
1003
1004/* TRACE_STACK */
1005
1006static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1007 int flags, struct trace_event *event)
1008{
1009 struct stack_entry *field;
1010 struct trace_seq *s = &iter->seq;
1011 unsigned long *p;
1012 unsigned long *end;
1013
1014 trace_assign_type(field, iter->ent);
1015 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1016
1017 trace_seq_puts(s, "<stack trace>\n");
1018
1019 for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1020
1021 if (trace_seq_has_overflowed(s))
1022 break;
1023
1024 trace_seq_puts(s, " => ");
1025 seq_print_ip_sym(s, *p, flags);
1026 trace_seq_putc(s, '\n');
1027 }
1028
1029 return trace_handle_return(s);
1030}
1031
1032static struct trace_event_functions trace_stack_funcs = {
1033 .trace = trace_stack_print,
1034};
1035
1036static struct trace_event trace_stack_event = {
1037 .type = TRACE_STACK,
1038 .funcs = &trace_stack_funcs,
1039};
1040
1041/* TRACE_USER_STACK */
1042static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1043 int flags, struct trace_event *event)
1044{
1045 struct trace_array *tr = iter->tr;
1046 struct userstack_entry *field;
1047 struct trace_seq *s = &iter->seq;
1048 struct mm_struct *mm = NULL;
1049 unsigned int i;
1050
1051 trace_assign_type(field, iter->ent);
1052
1053 trace_seq_puts(s, "<user stack trace>\n");
1054
1055 if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
1056 struct task_struct *task;
1057 /*
1058 * we do the lookup on the thread group leader,
1059 * since individual threads might have already quit!
1060 */
1061 rcu_read_lock();
1062 task = find_task_by_vpid(field->tgid);
1063 if (task)
1064 mm = get_task_mm(task);
1065 rcu_read_unlock();
1066 }
1067
1068 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1069 unsigned long ip = field->caller[i];
1070
1071 if (ip == ULONG_MAX || trace_seq_has_overflowed(s))
1072 break;
1073
1074 trace_seq_puts(s, " => ");
1075
1076 if (!ip) {
1077 trace_seq_puts(s, "??");
1078 trace_seq_putc(s, '\n');
1079 continue;
1080 }
1081
1082 seq_print_user_ip(s, mm, ip, flags);
1083 trace_seq_putc(s, '\n');
1084 }
1085
1086 if (mm)
1087 mmput(mm);
1088
1089 return trace_handle_return(s);
1090}
1091
1092static struct trace_event_functions trace_user_stack_funcs = {
1093 .trace = trace_user_stack_print,
1094};
1095
1096static struct trace_event trace_user_stack_event = {
1097 .type = TRACE_USER_STACK,
1098 .funcs = &trace_user_stack_funcs,
1099};
1100
1101/* TRACE_BPUTS */
1102static enum print_line_t
1103trace_bputs_print(struct trace_iterator *iter, int flags,
1104 struct trace_event *event)
1105{
1106 struct trace_entry *entry = iter->ent;
1107 struct trace_seq *s = &iter->seq;
1108 struct bputs_entry *field;
1109
1110 trace_assign_type(field, entry);
1111
1112 seq_print_ip_sym(s, field->ip, flags);
1113 trace_seq_puts(s, ": ");
1114 trace_seq_puts(s, field->str);
1115
1116 return trace_handle_return(s);
1117}
1118
1119
1120static enum print_line_t
1121trace_bputs_raw(struct trace_iterator *iter, int flags,
1122 struct trace_event *event)
1123{
1124 struct bputs_entry *field;
1125 struct trace_seq *s = &iter->seq;
1126
1127 trace_assign_type(field, iter->ent);
1128
1129 trace_seq_printf(s, ": %lx : ", field->ip);
1130 trace_seq_puts(s, field->str);
1131
1132 return trace_handle_return(s);
1133}
1134
1135static struct trace_event_functions trace_bputs_funcs = {
1136 .trace = trace_bputs_print,
1137 .raw = trace_bputs_raw,
1138};
1139
1140static struct trace_event trace_bputs_event = {
1141 .type = TRACE_BPUTS,
1142 .funcs = &trace_bputs_funcs,
1143};
1144
1145/* TRACE_BPRINT */
1146static enum print_line_t
1147trace_bprint_print(struct trace_iterator *iter, int flags,
1148 struct trace_event *event)
1149{
1150 struct trace_entry *entry = iter->ent;
1151 struct trace_seq *s = &iter->seq;
1152 struct bprint_entry *field;
1153
1154 trace_assign_type(field, entry);
1155
1156 seq_print_ip_sym(s, field->ip, flags);
1157 trace_seq_puts(s, ": ");
1158 trace_seq_bprintf(s, field->fmt, field->buf);
1159
1160 return trace_handle_return(s);
1161}
1162
1163
1164static enum print_line_t
1165trace_bprint_raw(struct trace_iterator *iter, int flags,
1166 struct trace_event *event)
1167{
1168 struct bprint_entry *field;
1169 struct trace_seq *s = &iter->seq;
1170
1171 trace_assign_type(field, iter->ent);
1172
1173 trace_seq_printf(s, ": %lx : ", field->ip);
1174 trace_seq_bprintf(s, field->fmt, field->buf);
1175
1176 return trace_handle_return(s);
1177}
1178
1179static struct trace_event_functions trace_bprint_funcs = {
1180 .trace = trace_bprint_print,
1181 .raw = trace_bprint_raw,
1182};
1183
1184static struct trace_event trace_bprint_event = {
1185 .type = TRACE_BPRINT,
1186 .funcs = &trace_bprint_funcs,
1187};
1188
1189/* TRACE_PRINT */
1190static enum print_line_t trace_print_print(struct trace_iterator *iter,
1191 int flags, struct trace_event *event)
1192{
1193 struct print_entry *field;
1194 struct trace_seq *s = &iter->seq;
1195
1196 trace_assign_type(field, iter->ent);
1197
1198 seq_print_ip_sym(s, field->ip, flags);
1199 trace_seq_printf(s, ": %s", field->buf);
1200
1201 return trace_handle_return(s);
1202}
1203
1204static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1205 struct trace_event *event)
1206{
1207 struct print_entry *field;
1208
1209 trace_assign_type(field, iter->ent);
1210
1211 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1212
1213 return trace_handle_return(&iter->seq);
1214}
1215
1216static struct trace_event_functions trace_print_funcs = {
1217 .trace = trace_print_print,
1218 .raw = trace_print_raw,
1219};
1220
1221static struct trace_event trace_print_event = {
1222 .type = TRACE_PRINT,
1223 .funcs = &trace_print_funcs,
1224};
1225
1226
1227static struct trace_event *events[] __initdata = {
1228 &trace_fn_event,
1229 &trace_ctx_event,
1230 &trace_wake_event,
1231 &trace_stack_event,
1232 &trace_user_stack_event,
1233 &trace_bputs_event,
1234 &trace_bprint_event,
1235 &trace_print_event,
1236 NULL
1237};
1238
1239__init static int init_events(void)
1240{
1241 struct trace_event *event;
1242 int i, ret;
1243
1244 for (i = 0; events[i]; i++) {
1245 event = events[i];
1246
1247 ret = register_trace_event(event);
1248 if (!ret) {
1249 printk(KERN_WARNING "event %d failed to register\n",
1250 event->type);
1251 WARN_ON_ONCE(1);
1252 }
1253 }
1254
1255 return 0;
1256}
1257early_initcall(init_events);
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
17DECLARE_RWSEM(trace_event_sem);
18
19static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
20
21static int next_event_type = __TRACE_LAST_TYPE + 1;
22
23int 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
40enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
41{
42 struct trace_seq *s = &iter->seq;
43 struct trace_entry *entry = iter->ent;
44 struct bputs_entry *field;
45 int ret;
46
47 trace_assign_type(field, entry);
48
49 ret = trace_seq_puts(s, field->str);
50 if (!ret)
51 return TRACE_TYPE_PARTIAL_LINE;
52
53 return TRACE_TYPE_HANDLED;
54}
55
56enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
57{
58 struct trace_seq *s = &iter->seq;
59 struct trace_entry *entry = iter->ent;
60 struct bprint_entry *field;
61 int ret;
62
63 trace_assign_type(field, entry);
64
65 ret = trace_seq_bprintf(s, field->fmt, field->buf);
66 if (!ret)
67 return TRACE_TYPE_PARTIAL_LINE;
68
69 return TRACE_TYPE_HANDLED;
70}
71
72enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
73{
74 struct trace_seq *s = &iter->seq;
75 struct trace_entry *entry = iter->ent;
76 struct print_entry *field;
77 int ret;
78
79 trace_assign_type(field, entry);
80
81 ret = trace_seq_puts(s, field->buf);
82 if (!ret)
83 return TRACE_TYPE_PARTIAL_LINE;
84
85 return TRACE_TYPE_HANDLED;
86}
87
88/**
89 * trace_seq_printf - sequence printing of trace information
90 * @s: trace sequence descriptor
91 * @fmt: printf format string
92 *
93 * It returns 0 if the trace oversizes the buffer's free
94 * space, 1 otherwise.
95 *
96 * The tracer may use either sequence operations or its own
97 * copy to user routines. To simplify formating of a trace
98 * trace_seq_printf is used to store strings into a special
99 * buffer (@s). Then the output may be either used by
100 * the sequencer or pulled into another buffer.
101 */
102int
103trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
104{
105 int len = (PAGE_SIZE - 1) - s->len;
106 va_list ap;
107 int ret;
108
109 if (s->full || !len)
110 return 0;
111
112 va_start(ap, fmt);
113 ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
114 va_end(ap);
115
116 /* If we can't write it all, don't bother writing anything */
117 if (ret >= len) {
118 s->full = 1;
119 return 0;
120 }
121
122 s->len += ret;
123
124 return 1;
125}
126EXPORT_SYMBOL_GPL(trace_seq_printf);
127
128/**
129 * trace_seq_vprintf - sequence printing of trace information
130 * @s: trace sequence descriptor
131 * @fmt: printf format string
132 *
133 * The tracer may use either sequence operations or its own
134 * copy to user routines. To simplify formating of a trace
135 * trace_seq_printf is used to store strings into a special
136 * buffer (@s). Then the output may be either used by
137 * the sequencer or pulled into another buffer.
138 */
139int
140trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
141{
142 int len = (PAGE_SIZE - 1) - s->len;
143 int ret;
144
145 if (s->full || !len)
146 return 0;
147
148 ret = vsnprintf(s->buffer + s->len, len, fmt, args);
149
150 /* If we can't write it all, don't bother writing anything */
151 if (ret >= len) {
152 s->full = 1;
153 return 0;
154 }
155
156 s->len += ret;
157
158 return len;
159}
160EXPORT_SYMBOL_GPL(trace_seq_vprintf);
161
162int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
163{
164 int len = (PAGE_SIZE - 1) - s->len;
165 int ret;
166
167 if (s->full || !len)
168 return 0;
169
170 ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
171
172 /* If we can't write it all, don't bother writing anything */
173 if (ret >= len) {
174 s->full = 1;
175 return 0;
176 }
177
178 s->len += ret;
179
180 return len;
181}
182
183/**
184 * trace_seq_puts - trace sequence printing of simple string
185 * @s: trace sequence descriptor
186 * @str: simple string to record
187 *
188 * The tracer may use either the sequence operations or its own
189 * copy to user routines. This function records a simple string
190 * into a special buffer (@s) for later retrieval by a sequencer
191 * or other mechanism.
192 */
193int trace_seq_puts(struct trace_seq *s, const char *str)
194{
195 int len = strlen(str);
196
197 if (s->full)
198 return 0;
199
200 if (len > ((PAGE_SIZE - 1) - s->len)) {
201 s->full = 1;
202 return 0;
203 }
204
205 memcpy(s->buffer + s->len, str, len);
206 s->len += len;
207
208 return len;
209}
210
211int trace_seq_putc(struct trace_seq *s, unsigned char c)
212{
213 if (s->full)
214 return 0;
215
216 if (s->len >= (PAGE_SIZE - 1)) {
217 s->full = 1;
218 return 0;
219 }
220
221 s->buffer[s->len++] = c;
222
223 return 1;
224}
225EXPORT_SYMBOL(trace_seq_putc);
226
227int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
228{
229 if (s->full)
230 return 0;
231
232 if (len > ((PAGE_SIZE - 1) - s->len)) {
233 s->full = 1;
234 return 0;
235 }
236
237 memcpy(s->buffer + s->len, mem, len);
238 s->len += len;
239
240 return len;
241}
242
243int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
244{
245 unsigned char hex[HEX_CHARS];
246 const unsigned char *data = mem;
247 int i, j;
248
249 if (s->full)
250 return 0;
251
252#ifdef __BIG_ENDIAN
253 for (i = 0, j = 0; i < len; i++) {
254#else
255 for (i = len-1, j = 0; i >= 0; i--) {
256#endif
257 hex[j++] = hex_asc_hi(data[i]);
258 hex[j++] = hex_asc_lo(data[i]);
259 }
260 hex[j++] = ' ';
261
262 return trace_seq_putmem(s, hex, j);
263}
264
265void *trace_seq_reserve(struct trace_seq *s, size_t len)
266{
267 void *ret;
268
269 if (s->full)
270 return NULL;
271
272 if (len > ((PAGE_SIZE - 1) - s->len)) {
273 s->full = 1;
274 return NULL;
275 }
276
277 ret = s->buffer + s->len;
278 s->len += len;
279
280 return ret;
281}
282
283int trace_seq_path(struct trace_seq *s, const struct path *path)
284{
285 unsigned char *p;
286
287 if (s->full)
288 return 0;
289
290 if (s->len >= (PAGE_SIZE - 1)) {
291 s->full = 1;
292 return 0;
293 }
294
295 p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
296 if (!IS_ERR(p)) {
297 p = mangle_path(s->buffer + s->len, p, "\n");
298 if (p) {
299 s->len = p - s->buffer;
300 return 1;
301 }
302 } else {
303 s->buffer[s->len++] = '?';
304 return 1;
305 }
306
307 s->full = 1;
308 return 0;
309}
310
311const char *
312ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
313 unsigned long flags,
314 const struct trace_print_flags *flag_array)
315{
316 unsigned long mask;
317 const char *str;
318 const char *ret = p->buffer + p->len;
319 int i, first = 1;
320
321 for (i = 0; flag_array[i].name && flags; i++) {
322
323 mask = flag_array[i].mask;
324 if ((flags & mask) != mask)
325 continue;
326
327 str = flag_array[i].name;
328 flags &= ~mask;
329 if (!first && delim)
330 trace_seq_puts(p, delim);
331 else
332 first = 0;
333 trace_seq_puts(p, str);
334 }
335
336 /* check for left over flags */
337 if (flags) {
338 if (!first && delim)
339 trace_seq_puts(p, delim);
340 trace_seq_printf(p, "0x%lx", flags);
341 }
342
343 trace_seq_putc(p, 0);
344
345 return ret;
346}
347EXPORT_SYMBOL(ftrace_print_flags_seq);
348
349const char *
350ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
351 const struct trace_print_flags *symbol_array)
352{
353 int i;
354 const char *ret = p->buffer + p->len;
355
356 for (i = 0; symbol_array[i].name; i++) {
357
358 if (val != symbol_array[i].mask)
359 continue;
360
361 trace_seq_puts(p, symbol_array[i].name);
362 break;
363 }
364
365 if (ret == (const char *)(p->buffer + p->len))
366 trace_seq_printf(p, "0x%lx", val);
367
368 trace_seq_putc(p, 0);
369
370 return ret;
371}
372EXPORT_SYMBOL(ftrace_print_symbols_seq);
373
374#if BITS_PER_LONG == 32
375const char *
376ftrace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
377 const struct trace_print_flags_u64 *symbol_array)
378{
379 int i;
380 const char *ret = p->buffer + p->len;
381
382 for (i = 0; symbol_array[i].name; i++) {
383
384 if (val != symbol_array[i].mask)
385 continue;
386
387 trace_seq_puts(p, symbol_array[i].name);
388 break;
389 }
390
391 if (ret == (const char *)(p->buffer + p->len))
392 trace_seq_printf(p, "0x%llx", val);
393
394 trace_seq_putc(p, 0);
395
396 return ret;
397}
398EXPORT_SYMBOL(ftrace_print_symbols_seq_u64);
399#endif
400
401const char *
402ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
403{
404 int i;
405 const char *ret = p->buffer + p->len;
406
407 for (i = 0; i < buf_len; i++)
408 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
409
410 trace_seq_putc(p, 0);
411
412 return ret;
413}
414EXPORT_SYMBOL(ftrace_print_hex_seq);
415
416int ftrace_raw_output_prep(struct trace_iterator *iter,
417 struct trace_event *trace_event)
418{
419 struct ftrace_event_call *event;
420 struct trace_seq *s = &iter->seq;
421 struct trace_seq *p = &iter->tmp_seq;
422 struct trace_entry *entry;
423 int ret;
424
425 event = container_of(trace_event, struct ftrace_event_call, event);
426 entry = iter->ent;
427
428 if (entry->type != event->event.type) {
429 WARN_ON_ONCE(1);
430 return TRACE_TYPE_UNHANDLED;
431 }
432
433 trace_seq_init(p);
434 ret = trace_seq_printf(s, "%s: ", ftrace_event_name(event));
435 if (!ret)
436 return TRACE_TYPE_PARTIAL_LINE;
437
438 return 0;
439}
440EXPORT_SYMBOL(ftrace_raw_output_prep);
441
442static int ftrace_output_raw(struct trace_iterator *iter, char *name,
443 char *fmt, va_list ap)
444{
445 struct trace_seq *s = &iter->seq;
446 int ret;
447
448 ret = trace_seq_printf(s, "%s: ", name);
449 if (!ret)
450 return TRACE_TYPE_PARTIAL_LINE;
451
452 ret = trace_seq_vprintf(s, fmt, ap);
453
454 if (!ret)
455 return TRACE_TYPE_PARTIAL_LINE;
456
457 return TRACE_TYPE_HANDLED;
458}
459
460int ftrace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
461{
462 va_list ap;
463 int ret;
464
465 va_start(ap, fmt);
466 ret = ftrace_output_raw(iter, name, fmt, ap);
467 va_end(ap);
468
469 return ret;
470}
471EXPORT_SYMBOL_GPL(ftrace_output_call);
472
473#ifdef CONFIG_KRETPROBES
474static inline const char *kretprobed(const char *name)
475{
476 static const char tramp_name[] = "kretprobe_trampoline";
477 int size = sizeof(tramp_name);
478
479 if (strncmp(tramp_name, name, size) == 0)
480 return "[unknown/kretprobe'd]";
481 return name;
482}
483#else
484static inline const char *kretprobed(const char *name)
485{
486 return name;
487}
488#endif /* CONFIG_KRETPROBES */
489
490static int
491seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
492{
493#ifdef CONFIG_KALLSYMS
494 char str[KSYM_SYMBOL_LEN];
495 const char *name;
496
497 kallsyms_lookup(address, NULL, NULL, NULL, str);
498
499 name = kretprobed(str);
500
501 return trace_seq_printf(s, fmt, name);
502#endif
503 return 1;
504}
505
506static int
507seq_print_sym_offset(struct trace_seq *s, const char *fmt,
508 unsigned long address)
509{
510#ifdef CONFIG_KALLSYMS
511 char str[KSYM_SYMBOL_LEN];
512 const char *name;
513
514 sprint_symbol(str, address);
515 name = kretprobed(str);
516
517 return trace_seq_printf(s, fmt, name);
518#endif
519 return 1;
520}
521
522#ifndef CONFIG_64BIT
523# define IP_FMT "%08lx"
524#else
525# define IP_FMT "%016lx"
526#endif
527
528int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
529 unsigned long ip, unsigned long sym_flags)
530{
531 struct file *file = NULL;
532 unsigned long vmstart = 0;
533 int ret = 1;
534
535 if (s->full)
536 return 0;
537
538 if (mm) {
539 const struct vm_area_struct *vma;
540
541 down_read(&mm->mmap_sem);
542 vma = find_vma(mm, ip);
543 if (vma) {
544 file = vma->vm_file;
545 vmstart = vma->vm_start;
546 }
547 if (file) {
548 ret = trace_seq_path(s, &file->f_path);
549 if (ret)
550 ret = trace_seq_printf(s, "[+0x%lx]",
551 ip - vmstart);
552 }
553 up_read(&mm->mmap_sem);
554 }
555 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
556 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
557 return ret;
558}
559
560int
561seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
562 unsigned long sym_flags)
563{
564 struct mm_struct *mm = NULL;
565 int ret = 1;
566 unsigned int i;
567
568 if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
569 struct task_struct *task;
570 /*
571 * we do the lookup on the thread group leader,
572 * since individual threads might have already quit!
573 */
574 rcu_read_lock();
575 task = find_task_by_vpid(entry->tgid);
576 if (task)
577 mm = get_task_mm(task);
578 rcu_read_unlock();
579 }
580
581 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
582 unsigned long ip = entry->caller[i];
583
584 if (ip == ULONG_MAX || !ret)
585 break;
586 if (ret)
587 ret = trace_seq_puts(s, " => ");
588 if (!ip) {
589 if (ret)
590 ret = trace_seq_puts(s, "??");
591 if (ret)
592 ret = trace_seq_putc(s, '\n');
593 continue;
594 }
595 if (!ret)
596 break;
597 if (ret)
598 ret = seq_print_user_ip(s, mm, ip, sym_flags);
599 ret = trace_seq_putc(s, '\n');
600 }
601
602 if (mm)
603 mmput(mm);
604 return ret;
605}
606
607int
608seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
609{
610 int ret;
611
612 if (!ip)
613 return trace_seq_putc(s, '0');
614
615 if (sym_flags & TRACE_ITER_SYM_OFFSET)
616 ret = seq_print_sym_offset(s, "%s", ip);
617 else
618 ret = seq_print_sym_short(s, "%s", ip);
619
620 if (!ret)
621 return 0;
622
623 if (sym_flags & TRACE_ITER_SYM_ADDR)
624 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
625 return ret;
626}
627
628/**
629 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
630 * @s: trace seq struct to write to
631 * @entry: The trace entry field from the ring buffer
632 *
633 * Prints the generic fields of irqs off, in hard or softirq, preempt
634 * count.
635 */
636int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
637{
638 char hardsoft_irq;
639 char need_resched;
640 char irqs_off;
641 int hardirq;
642 int softirq;
643 int ret;
644
645 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
646 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
647
648 irqs_off =
649 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
650 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
651 '.';
652
653 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
654 TRACE_FLAG_PREEMPT_RESCHED)) {
655 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
656 need_resched = 'N';
657 break;
658 case TRACE_FLAG_NEED_RESCHED:
659 need_resched = 'n';
660 break;
661 case TRACE_FLAG_PREEMPT_RESCHED:
662 need_resched = 'p';
663 break;
664 default:
665 need_resched = '.';
666 break;
667 }
668
669 hardsoft_irq =
670 (hardirq && softirq) ? 'H' :
671 hardirq ? 'h' :
672 softirq ? 's' :
673 '.';
674
675 if (!trace_seq_printf(s, "%c%c%c",
676 irqs_off, need_resched, hardsoft_irq))
677 return 0;
678
679 if (entry->preempt_count)
680 ret = trace_seq_printf(s, "%x", entry->preempt_count);
681 else
682 ret = trace_seq_putc(s, '.');
683
684 return ret;
685}
686
687static int
688lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
689{
690 char comm[TASK_COMM_LEN];
691
692 trace_find_cmdline(entry->pid, comm);
693
694 if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
695 comm, entry->pid, cpu))
696 return 0;
697
698 return trace_print_lat_fmt(s, entry);
699}
700
701static unsigned long preempt_mark_thresh_us = 100;
702
703static int
704lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
705{
706 unsigned long verbose = trace_flags & TRACE_ITER_VERBOSE;
707 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
708 unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start;
709 unsigned long long rel_ts = next_ts - iter->ts;
710 struct trace_seq *s = &iter->seq;
711
712 if (in_ns) {
713 abs_ts = ns2usecs(abs_ts);
714 rel_ts = ns2usecs(rel_ts);
715 }
716
717 if (verbose && in_ns) {
718 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
719 unsigned long abs_msec = (unsigned long)abs_ts;
720 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
721 unsigned long rel_msec = (unsigned long)rel_ts;
722
723 return trace_seq_printf(
724 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
725 ns2usecs(iter->ts),
726 abs_msec, abs_usec,
727 rel_msec, rel_usec);
728 } else if (verbose && !in_ns) {
729 return trace_seq_printf(
730 s, "[%016llx] %lld (+%lld): ",
731 iter->ts, abs_ts, rel_ts);
732 } else if (!verbose && in_ns) {
733 return trace_seq_printf(
734 s, " %4lldus%c: ",
735 abs_ts,
736 rel_ts > preempt_mark_thresh_us ? '!' :
737 rel_ts > 1 ? '+' : ' ');
738 } else { /* !verbose && !in_ns */
739 return trace_seq_printf(s, " %4lld: ", abs_ts);
740 }
741}
742
743int trace_print_context(struct trace_iterator *iter)
744{
745 struct trace_seq *s = &iter->seq;
746 struct trace_entry *entry = iter->ent;
747 unsigned long long t;
748 unsigned long secs, usec_rem;
749 char comm[TASK_COMM_LEN];
750 int ret;
751
752 trace_find_cmdline(entry->pid, comm);
753
754 ret = trace_seq_printf(s, "%16s-%-5d [%03d] ",
755 comm, entry->pid, iter->cpu);
756 if (!ret)
757 return 0;
758
759 if (trace_flags & TRACE_ITER_IRQ_INFO) {
760 ret = trace_print_lat_fmt(s, entry);
761 if (!ret)
762 return 0;
763 }
764
765 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
766 t = ns2usecs(iter->ts);
767 usec_rem = do_div(t, USEC_PER_SEC);
768 secs = (unsigned long)t;
769 return trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
770 } else
771 return trace_seq_printf(s, " %12llu: ", iter->ts);
772}
773
774int trace_print_lat_context(struct trace_iterator *iter)
775{
776 u64 next_ts;
777 int ret;
778 /* trace_find_next_entry will reset ent_size */
779 int ent_size = iter->ent_size;
780 struct trace_seq *s = &iter->seq;
781 struct trace_entry *entry = iter->ent,
782 *next_entry = trace_find_next_entry(iter, NULL,
783 &next_ts);
784 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
785
786 /* Restore the original ent_size */
787 iter->ent_size = ent_size;
788
789 if (!next_entry)
790 next_ts = iter->ts;
791
792 if (verbose) {
793 char comm[TASK_COMM_LEN];
794
795 trace_find_cmdline(entry->pid, comm);
796
797 ret = trace_seq_printf(
798 s, "%16s %5d %3d %d %08x %08lx ",
799 comm, entry->pid, iter->cpu, entry->flags,
800 entry->preempt_count, iter->idx);
801 } else {
802 ret = lat_print_generic(s, entry, iter->cpu);
803 }
804
805 if (ret)
806 ret = lat_print_timestamp(iter, next_ts);
807
808 return ret;
809}
810
811static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
812
813static int task_state_char(unsigned long state)
814{
815 int bit = state ? __ffs(state) + 1 : 0;
816
817 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
818}
819
820/**
821 * ftrace_find_event - find a registered event
822 * @type: the type of event to look for
823 *
824 * Returns an event of type @type otherwise NULL
825 * Called with trace_event_read_lock() held.
826 */
827struct trace_event *ftrace_find_event(int type)
828{
829 struct trace_event *event;
830 unsigned key;
831
832 key = type & (EVENT_HASHSIZE - 1);
833
834 hlist_for_each_entry(event, &event_hash[key], node) {
835 if (event->type == type)
836 return event;
837 }
838
839 return NULL;
840}
841
842static LIST_HEAD(ftrace_event_list);
843
844static int trace_search_list(struct list_head **list)
845{
846 struct trace_event *e;
847 int last = __TRACE_LAST_TYPE;
848
849 if (list_empty(&ftrace_event_list)) {
850 *list = &ftrace_event_list;
851 return last + 1;
852 }
853
854 /*
855 * We used up all possible max events,
856 * lets see if somebody freed one.
857 */
858 list_for_each_entry(e, &ftrace_event_list, list) {
859 if (e->type != last + 1)
860 break;
861 last++;
862 }
863
864 /* Did we used up all 65 thousand events??? */
865 if ((last + 1) > FTRACE_MAX_EVENT)
866 return 0;
867
868 *list = &e->list;
869 return last + 1;
870}
871
872void trace_event_read_lock(void)
873{
874 down_read(&trace_event_sem);
875}
876
877void trace_event_read_unlock(void)
878{
879 up_read(&trace_event_sem);
880}
881
882/**
883 * register_ftrace_event - register output for an event type
884 * @event: the event type to register
885 *
886 * Event types are stored in a hash and this hash is used to
887 * find a way to print an event. If the @event->type is set
888 * then it will use that type, otherwise it will assign a
889 * type to use.
890 *
891 * If you assign your own type, please make sure it is added
892 * to the trace_type enum in trace.h, to avoid collisions
893 * with the dynamic types.
894 *
895 * Returns the event type number or zero on error.
896 */
897int register_ftrace_event(struct trace_event *event)
898{
899 unsigned key;
900 int ret = 0;
901
902 down_write(&trace_event_sem);
903
904 if (WARN_ON(!event))
905 goto out;
906
907 if (WARN_ON(!event->funcs))
908 goto out;
909
910 INIT_LIST_HEAD(&event->list);
911
912 if (!event->type) {
913 struct list_head *list = NULL;
914
915 if (next_event_type > FTRACE_MAX_EVENT) {
916
917 event->type = trace_search_list(&list);
918 if (!event->type)
919 goto out;
920
921 } else {
922
923 event->type = next_event_type++;
924 list = &ftrace_event_list;
925 }
926
927 if (WARN_ON(ftrace_find_event(event->type)))
928 goto out;
929
930 list_add_tail(&event->list, list);
931
932 } else if (event->type > __TRACE_LAST_TYPE) {
933 printk(KERN_WARNING "Need to add type to trace.h\n");
934 WARN_ON(1);
935 goto out;
936 } else {
937 /* Is this event already used */
938 if (ftrace_find_event(event->type))
939 goto out;
940 }
941
942 if (event->funcs->trace == NULL)
943 event->funcs->trace = trace_nop_print;
944 if (event->funcs->raw == NULL)
945 event->funcs->raw = trace_nop_print;
946 if (event->funcs->hex == NULL)
947 event->funcs->hex = trace_nop_print;
948 if (event->funcs->binary == NULL)
949 event->funcs->binary = trace_nop_print;
950
951 key = event->type & (EVENT_HASHSIZE - 1);
952
953 hlist_add_head(&event->node, &event_hash[key]);
954
955 ret = event->type;
956 out:
957 up_write(&trace_event_sem);
958
959 return ret;
960}
961EXPORT_SYMBOL_GPL(register_ftrace_event);
962
963/*
964 * Used by module code with the trace_event_sem held for write.
965 */
966int __unregister_ftrace_event(struct trace_event *event)
967{
968 hlist_del(&event->node);
969 list_del(&event->list);
970 return 0;
971}
972
973/**
974 * unregister_ftrace_event - remove a no longer used event
975 * @event: the event to remove
976 */
977int unregister_ftrace_event(struct trace_event *event)
978{
979 down_write(&trace_event_sem);
980 __unregister_ftrace_event(event);
981 up_write(&trace_event_sem);
982
983 return 0;
984}
985EXPORT_SYMBOL_GPL(unregister_ftrace_event);
986
987/*
988 * Standard events
989 */
990
991enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
992 struct trace_event *event)
993{
994 if (!trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type))
995 return TRACE_TYPE_PARTIAL_LINE;
996
997 return TRACE_TYPE_HANDLED;
998}
999
1000/* TRACE_FN */
1001static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
1002 struct trace_event *event)
1003{
1004 struct ftrace_entry *field;
1005 struct trace_seq *s = &iter->seq;
1006
1007 trace_assign_type(field, iter->ent);
1008
1009 if (!seq_print_ip_sym(s, field->ip, flags))
1010 goto partial;
1011
1012 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
1013 if (!trace_seq_puts(s, " <-"))
1014 goto partial;
1015 if (!seq_print_ip_sym(s,
1016 field->parent_ip,
1017 flags))
1018 goto partial;
1019 }
1020 if (!trace_seq_putc(s, '\n'))
1021 goto partial;
1022
1023 return TRACE_TYPE_HANDLED;
1024
1025 partial:
1026 return TRACE_TYPE_PARTIAL_LINE;
1027}
1028
1029static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
1030 struct trace_event *event)
1031{
1032 struct ftrace_entry *field;
1033
1034 trace_assign_type(field, iter->ent);
1035
1036 if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
1037 field->ip,
1038 field->parent_ip))
1039 return TRACE_TYPE_PARTIAL_LINE;
1040
1041 return TRACE_TYPE_HANDLED;
1042}
1043
1044static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
1045 struct trace_event *event)
1046{
1047 struct ftrace_entry *field;
1048 struct trace_seq *s = &iter->seq;
1049
1050 trace_assign_type(field, iter->ent);
1051
1052 SEQ_PUT_HEX_FIELD_RET(s, field->ip);
1053 SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
1054
1055 return TRACE_TYPE_HANDLED;
1056}
1057
1058static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
1059 struct trace_event *event)
1060{
1061 struct ftrace_entry *field;
1062 struct trace_seq *s = &iter->seq;
1063
1064 trace_assign_type(field, iter->ent);
1065
1066 SEQ_PUT_FIELD_RET(s, field->ip);
1067 SEQ_PUT_FIELD_RET(s, field->parent_ip);
1068
1069 return TRACE_TYPE_HANDLED;
1070}
1071
1072static struct trace_event_functions trace_fn_funcs = {
1073 .trace = trace_fn_trace,
1074 .raw = trace_fn_raw,
1075 .hex = trace_fn_hex,
1076 .binary = trace_fn_bin,
1077};
1078
1079static struct trace_event trace_fn_event = {
1080 .type = TRACE_FN,
1081 .funcs = &trace_fn_funcs,
1082};
1083
1084/* TRACE_CTX an TRACE_WAKE */
1085static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
1086 char *delim)
1087{
1088 struct ctx_switch_entry *field;
1089 char comm[TASK_COMM_LEN];
1090 int S, T;
1091
1092
1093 trace_assign_type(field, iter->ent);
1094
1095 T = task_state_char(field->next_state);
1096 S = task_state_char(field->prev_state);
1097 trace_find_cmdline(field->next_pid, comm);
1098 if (!trace_seq_printf(&iter->seq,
1099 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
1100 field->prev_pid,
1101 field->prev_prio,
1102 S, delim,
1103 field->next_cpu,
1104 field->next_pid,
1105 field->next_prio,
1106 T, comm))
1107 return TRACE_TYPE_PARTIAL_LINE;
1108
1109 return TRACE_TYPE_HANDLED;
1110}
1111
1112static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
1113 struct trace_event *event)
1114{
1115 return trace_ctxwake_print(iter, "==>");
1116}
1117
1118static enum print_line_t trace_wake_print(struct trace_iterator *iter,
1119 int flags, struct trace_event *event)
1120{
1121 return trace_ctxwake_print(iter, " +");
1122}
1123
1124static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
1125{
1126 struct ctx_switch_entry *field;
1127 int T;
1128
1129 trace_assign_type(field, iter->ent);
1130
1131 if (!S)
1132 S = task_state_char(field->prev_state);
1133 T = task_state_char(field->next_state);
1134 if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
1135 field->prev_pid,
1136 field->prev_prio,
1137 S,
1138 field->next_cpu,
1139 field->next_pid,
1140 field->next_prio,
1141 T))
1142 return TRACE_TYPE_PARTIAL_LINE;
1143
1144 return TRACE_TYPE_HANDLED;
1145}
1146
1147static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
1148 struct trace_event *event)
1149{
1150 return trace_ctxwake_raw(iter, 0);
1151}
1152
1153static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
1154 struct trace_event *event)
1155{
1156 return trace_ctxwake_raw(iter, '+');
1157}
1158
1159
1160static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
1161{
1162 struct ctx_switch_entry *field;
1163 struct trace_seq *s = &iter->seq;
1164 int T;
1165
1166 trace_assign_type(field, iter->ent);
1167
1168 if (!S)
1169 S = task_state_char(field->prev_state);
1170 T = task_state_char(field->next_state);
1171
1172 SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
1173 SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
1174 SEQ_PUT_HEX_FIELD_RET(s, S);
1175 SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
1176 SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
1177 SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
1178 SEQ_PUT_HEX_FIELD_RET(s, T);
1179
1180 return TRACE_TYPE_HANDLED;
1181}
1182
1183static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1184 struct trace_event *event)
1185{
1186 return trace_ctxwake_hex(iter, 0);
1187}
1188
1189static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1190 struct trace_event *event)
1191{
1192 return trace_ctxwake_hex(iter, '+');
1193}
1194
1195static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1196 int flags, struct trace_event *event)
1197{
1198 struct ctx_switch_entry *field;
1199 struct trace_seq *s = &iter->seq;
1200
1201 trace_assign_type(field, iter->ent);
1202
1203 SEQ_PUT_FIELD_RET(s, field->prev_pid);
1204 SEQ_PUT_FIELD_RET(s, field->prev_prio);
1205 SEQ_PUT_FIELD_RET(s, field->prev_state);
1206 SEQ_PUT_FIELD_RET(s, field->next_pid);
1207 SEQ_PUT_FIELD_RET(s, field->next_prio);
1208 SEQ_PUT_FIELD_RET(s, field->next_state);
1209
1210 return TRACE_TYPE_HANDLED;
1211}
1212
1213static struct trace_event_functions trace_ctx_funcs = {
1214 .trace = trace_ctx_print,
1215 .raw = trace_ctx_raw,
1216 .hex = trace_ctx_hex,
1217 .binary = trace_ctxwake_bin,
1218};
1219
1220static struct trace_event trace_ctx_event = {
1221 .type = TRACE_CTX,
1222 .funcs = &trace_ctx_funcs,
1223};
1224
1225static struct trace_event_functions trace_wake_funcs = {
1226 .trace = trace_wake_print,
1227 .raw = trace_wake_raw,
1228 .hex = trace_wake_hex,
1229 .binary = trace_ctxwake_bin,
1230};
1231
1232static struct trace_event trace_wake_event = {
1233 .type = TRACE_WAKE,
1234 .funcs = &trace_wake_funcs,
1235};
1236
1237/* TRACE_STACK */
1238
1239static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1240 int flags, struct trace_event *event)
1241{
1242 struct stack_entry *field;
1243 struct trace_seq *s = &iter->seq;
1244 unsigned long *p;
1245 unsigned long *end;
1246
1247 trace_assign_type(field, iter->ent);
1248 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1249
1250 if (!trace_seq_puts(s, "<stack trace>\n"))
1251 goto partial;
1252
1253 for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1254 if (!trace_seq_puts(s, " => "))
1255 goto partial;
1256
1257 if (!seq_print_ip_sym(s, *p, flags))
1258 goto partial;
1259 if (!trace_seq_putc(s, '\n'))
1260 goto partial;
1261 }
1262
1263 return TRACE_TYPE_HANDLED;
1264
1265 partial:
1266 return TRACE_TYPE_PARTIAL_LINE;
1267}
1268
1269static struct trace_event_functions trace_stack_funcs = {
1270 .trace = trace_stack_print,
1271};
1272
1273static struct trace_event trace_stack_event = {
1274 .type = TRACE_STACK,
1275 .funcs = &trace_stack_funcs,
1276};
1277
1278/* TRACE_USER_STACK */
1279static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1280 int flags, struct trace_event *event)
1281{
1282 struct userstack_entry *field;
1283 struct trace_seq *s = &iter->seq;
1284
1285 trace_assign_type(field, iter->ent);
1286
1287 if (!trace_seq_puts(s, "<user stack trace>\n"))
1288 goto partial;
1289
1290 if (!seq_print_userip_objs(field, s, flags))
1291 goto partial;
1292
1293 return TRACE_TYPE_HANDLED;
1294
1295 partial:
1296 return TRACE_TYPE_PARTIAL_LINE;
1297}
1298
1299static struct trace_event_functions trace_user_stack_funcs = {
1300 .trace = trace_user_stack_print,
1301};
1302
1303static struct trace_event trace_user_stack_event = {
1304 .type = TRACE_USER_STACK,
1305 .funcs = &trace_user_stack_funcs,
1306};
1307
1308/* TRACE_BPUTS */
1309static enum print_line_t
1310trace_bputs_print(struct trace_iterator *iter, int flags,
1311 struct trace_event *event)
1312{
1313 struct trace_entry *entry = iter->ent;
1314 struct trace_seq *s = &iter->seq;
1315 struct bputs_entry *field;
1316
1317 trace_assign_type(field, entry);
1318
1319 if (!seq_print_ip_sym(s, field->ip, flags))
1320 goto partial;
1321
1322 if (!trace_seq_puts(s, ": "))
1323 goto partial;
1324
1325 if (!trace_seq_puts(s, field->str))
1326 goto partial;
1327
1328 return TRACE_TYPE_HANDLED;
1329
1330 partial:
1331 return TRACE_TYPE_PARTIAL_LINE;
1332}
1333
1334
1335static enum print_line_t
1336trace_bputs_raw(struct trace_iterator *iter, int flags,
1337 struct trace_event *event)
1338{
1339 struct bputs_entry *field;
1340 struct trace_seq *s = &iter->seq;
1341
1342 trace_assign_type(field, iter->ent);
1343
1344 if (!trace_seq_printf(s, ": %lx : ", field->ip))
1345 goto partial;
1346
1347 if (!trace_seq_puts(s, field->str))
1348 goto partial;
1349
1350 return TRACE_TYPE_HANDLED;
1351
1352 partial:
1353 return TRACE_TYPE_PARTIAL_LINE;
1354}
1355
1356static struct trace_event_functions trace_bputs_funcs = {
1357 .trace = trace_bputs_print,
1358 .raw = trace_bputs_raw,
1359};
1360
1361static struct trace_event trace_bputs_event = {
1362 .type = TRACE_BPUTS,
1363 .funcs = &trace_bputs_funcs,
1364};
1365
1366/* TRACE_BPRINT */
1367static enum print_line_t
1368trace_bprint_print(struct trace_iterator *iter, int flags,
1369 struct trace_event *event)
1370{
1371 struct trace_entry *entry = iter->ent;
1372 struct trace_seq *s = &iter->seq;
1373 struct bprint_entry *field;
1374
1375 trace_assign_type(field, entry);
1376
1377 if (!seq_print_ip_sym(s, field->ip, flags))
1378 goto partial;
1379
1380 if (!trace_seq_puts(s, ": "))
1381 goto partial;
1382
1383 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1384 goto partial;
1385
1386 return TRACE_TYPE_HANDLED;
1387
1388 partial:
1389 return TRACE_TYPE_PARTIAL_LINE;
1390}
1391
1392
1393static enum print_line_t
1394trace_bprint_raw(struct trace_iterator *iter, int flags,
1395 struct trace_event *event)
1396{
1397 struct bprint_entry *field;
1398 struct trace_seq *s = &iter->seq;
1399
1400 trace_assign_type(field, iter->ent);
1401
1402 if (!trace_seq_printf(s, ": %lx : ", field->ip))
1403 goto partial;
1404
1405 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1406 goto partial;
1407
1408 return TRACE_TYPE_HANDLED;
1409
1410 partial:
1411 return TRACE_TYPE_PARTIAL_LINE;
1412}
1413
1414static struct trace_event_functions trace_bprint_funcs = {
1415 .trace = trace_bprint_print,
1416 .raw = trace_bprint_raw,
1417};
1418
1419static struct trace_event trace_bprint_event = {
1420 .type = TRACE_BPRINT,
1421 .funcs = &trace_bprint_funcs,
1422};
1423
1424/* TRACE_PRINT */
1425static enum print_line_t trace_print_print(struct trace_iterator *iter,
1426 int flags, struct trace_event *event)
1427{
1428 struct print_entry *field;
1429 struct trace_seq *s = &iter->seq;
1430
1431 trace_assign_type(field, iter->ent);
1432
1433 if (!seq_print_ip_sym(s, field->ip, flags))
1434 goto partial;
1435
1436 if (!trace_seq_printf(s, ": %s", field->buf))
1437 goto partial;
1438
1439 return TRACE_TYPE_HANDLED;
1440
1441 partial:
1442 return TRACE_TYPE_PARTIAL_LINE;
1443}
1444
1445static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1446 struct trace_event *event)
1447{
1448 struct print_entry *field;
1449
1450 trace_assign_type(field, iter->ent);
1451
1452 if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1453 goto partial;
1454
1455 return TRACE_TYPE_HANDLED;
1456
1457 partial:
1458 return TRACE_TYPE_PARTIAL_LINE;
1459}
1460
1461static struct trace_event_functions trace_print_funcs = {
1462 .trace = trace_print_print,
1463 .raw = trace_print_raw,
1464};
1465
1466static struct trace_event trace_print_event = {
1467 .type = TRACE_PRINT,
1468 .funcs = &trace_print_funcs,
1469};
1470
1471
1472static struct trace_event *events[] __initdata = {
1473 &trace_fn_event,
1474 &trace_ctx_event,
1475 &trace_wake_event,
1476 &trace_stack_event,
1477 &trace_user_stack_event,
1478 &trace_bputs_event,
1479 &trace_bprint_event,
1480 &trace_print_event,
1481 NULL
1482};
1483
1484__init static int init_events(void)
1485{
1486 struct trace_event *event;
1487 int i, ret;
1488
1489 for (i = 0; events[i]; i++) {
1490 event = events[i];
1491
1492 ret = register_ftrace_event(event);
1493 if (!ret) {
1494 printk(KERN_WARNING "event %d failed to register\n",
1495 event->type);
1496 WARN_ON_ONCE(1);
1497 }
1498 }
1499
1500 return 0;
1501}
1502early_initcall(init_events);