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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);
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_mutex);
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_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
56enum 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 */
86int
87trace_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}
110EXPORT_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 */
123int
124trace_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}
144EXPORT_SYMBOL_GPL(trace_seq_vprintf);
145
146int 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 */
177int 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
195int 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}
209EXPORT_SYMBOL(trace_seq_putc);
210
211int 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
227int 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
249void *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
267int 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
295const char *
296ftrace_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}
329EXPORT_SYMBOL(ftrace_print_flags_seq);
330
331const char *
332ftrace_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}
354EXPORT_SYMBOL(ftrace_print_symbols_seq);
355
356#if BITS_PER_LONG == 32
357const char *
358ftrace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
359 const struct trace_print_flags_u64 *symbol_array)
360{
361 int i;
362 const char *ret = p->buffer + p->len;
363
364 for (i = 0; symbol_array[i].name; i++) {
365
366 if (val != symbol_array[i].mask)
367 continue;
368
369 trace_seq_puts(p, symbol_array[i].name);
370 break;
371 }
372
373 if (!p->len)
374 trace_seq_printf(p, "0x%llx", val);
375
376 trace_seq_putc(p, 0);
377
378 return ret;
379}
380EXPORT_SYMBOL(ftrace_print_symbols_seq_u64);
381#endif
382
383const char *
384ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
385{
386 int i;
387 const char *ret = p->buffer + p->len;
388
389 for (i = 0; i < buf_len; i++)
390 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
391
392 trace_seq_putc(p, 0);
393
394 return ret;
395}
396EXPORT_SYMBOL(ftrace_print_hex_seq);
397
398#ifdef CONFIG_KRETPROBES
399static inline const char *kretprobed(const char *name)
400{
401 static const char tramp_name[] = "kretprobe_trampoline";
402 int size = sizeof(tramp_name);
403
404 if (strncmp(tramp_name, name, size) == 0)
405 return "[unknown/kretprobe'd]";
406 return name;
407}
408#else
409static inline const char *kretprobed(const char *name)
410{
411 return name;
412}
413#endif /* CONFIG_KRETPROBES */
414
415static int
416seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
417{
418#ifdef CONFIG_KALLSYMS
419 char str[KSYM_SYMBOL_LEN];
420 const char *name;
421
422 kallsyms_lookup(address, NULL, NULL, NULL, str);
423
424 name = kretprobed(str);
425
426 return trace_seq_printf(s, fmt, name);
427#endif
428 return 1;
429}
430
431static int
432seq_print_sym_offset(struct trace_seq *s, const char *fmt,
433 unsigned long address)
434{
435#ifdef CONFIG_KALLSYMS
436 char str[KSYM_SYMBOL_LEN];
437 const char *name;
438
439 sprint_symbol(str, address);
440 name = kretprobed(str);
441
442 return trace_seq_printf(s, fmt, name);
443#endif
444 return 1;
445}
446
447#ifndef CONFIG_64BIT
448# define IP_FMT "%08lx"
449#else
450# define IP_FMT "%016lx"
451#endif
452
453int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
454 unsigned long ip, unsigned long sym_flags)
455{
456 struct file *file = NULL;
457 unsigned long vmstart = 0;
458 int ret = 1;
459
460 if (s->full)
461 return 0;
462
463 if (mm) {
464 const struct vm_area_struct *vma;
465
466 down_read(&mm->mmap_sem);
467 vma = find_vma(mm, ip);
468 if (vma) {
469 file = vma->vm_file;
470 vmstart = vma->vm_start;
471 }
472 if (file) {
473 ret = trace_seq_path(s, &file->f_path);
474 if (ret)
475 ret = trace_seq_printf(s, "[+0x%lx]",
476 ip - vmstart);
477 }
478 up_read(&mm->mmap_sem);
479 }
480 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
481 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
482 return ret;
483}
484
485int
486seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
487 unsigned long sym_flags)
488{
489 struct mm_struct *mm = NULL;
490 int ret = 1;
491 unsigned int i;
492
493 if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
494 struct task_struct *task;
495 /*
496 * we do the lookup on the thread group leader,
497 * since individual threads might have already quit!
498 */
499 rcu_read_lock();
500 task = find_task_by_vpid(entry->tgid);
501 if (task)
502 mm = get_task_mm(task);
503 rcu_read_unlock();
504 }
505
506 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
507 unsigned long ip = entry->caller[i];
508
509 if (ip == ULONG_MAX || !ret)
510 break;
511 if (ret)
512 ret = trace_seq_puts(s, " => ");
513 if (!ip) {
514 if (ret)
515 ret = trace_seq_puts(s, "??");
516 if (ret)
517 ret = trace_seq_puts(s, "\n");
518 continue;
519 }
520 if (!ret)
521 break;
522 if (ret)
523 ret = seq_print_user_ip(s, mm, ip, sym_flags);
524 ret = trace_seq_puts(s, "\n");
525 }
526
527 if (mm)
528 mmput(mm);
529 return ret;
530}
531
532int
533seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
534{
535 int ret;
536
537 if (!ip)
538 return trace_seq_printf(s, "0");
539
540 if (sym_flags & TRACE_ITER_SYM_OFFSET)
541 ret = seq_print_sym_offset(s, "%s", ip);
542 else
543 ret = seq_print_sym_short(s, "%s", ip);
544
545 if (!ret)
546 return 0;
547
548 if (sym_flags & TRACE_ITER_SYM_ADDR)
549 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
550 return ret;
551}
552
553/**
554 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
555 * @s: trace seq struct to write to
556 * @entry: The trace entry field from the ring buffer
557 *
558 * Prints the generic fields of irqs off, in hard or softirq, preempt
559 * count.
560 */
561int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
562{
563 char hardsoft_irq;
564 char need_resched;
565 char irqs_off;
566 int hardirq;
567 int softirq;
568 int ret;
569
570 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
571 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
572
573 irqs_off =
574 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
575 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
576 '.';
577 need_resched =
578 (entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.';
579 hardsoft_irq =
580 (hardirq && softirq) ? 'H' :
581 hardirq ? 'h' :
582 softirq ? 's' :
583 '.';
584
585 if (!trace_seq_printf(s, "%c%c%c",
586 irqs_off, need_resched, hardsoft_irq))
587 return 0;
588
589 if (entry->preempt_count)
590 ret = trace_seq_printf(s, "%x", entry->preempt_count);
591 else
592 ret = trace_seq_putc(s, '.');
593
594 return ret;
595}
596
597static int
598lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
599{
600 char comm[TASK_COMM_LEN];
601
602 trace_find_cmdline(entry->pid, comm);
603
604 if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
605 comm, entry->pid, cpu))
606 return 0;
607
608 return trace_print_lat_fmt(s, entry);
609}
610
611static unsigned long preempt_mark_thresh = 100;
612
613static int
614lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
615 unsigned long rel_usecs)
616{
617 return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
618 rel_usecs > preempt_mark_thresh ? '!' :
619 rel_usecs > 1 ? '+' : ' ');
620}
621
622int trace_print_context(struct trace_iterator *iter)
623{
624 struct trace_seq *s = &iter->seq;
625 struct trace_entry *entry = iter->ent;
626 unsigned long long t = ns2usecs(iter->ts);
627 unsigned long usec_rem = do_div(t, USEC_PER_SEC);
628 unsigned long secs = (unsigned long)t;
629 char comm[TASK_COMM_LEN];
630
631 trace_find_cmdline(entry->pid, comm);
632
633 return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
634 comm, entry->pid, iter->cpu, secs, usec_rem);
635}
636
637int trace_print_lat_context(struct trace_iterator *iter)
638{
639 u64 next_ts;
640 int ret;
641 struct trace_seq *s = &iter->seq;
642 struct trace_entry *entry = iter->ent,
643 *next_entry = trace_find_next_entry(iter, NULL,
644 &next_ts);
645 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
646 unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
647 unsigned long rel_usecs;
648
649 if (!next_entry)
650 next_ts = iter->ts;
651 rel_usecs = ns2usecs(next_ts - iter->ts);
652
653 if (verbose) {
654 char comm[TASK_COMM_LEN];
655
656 trace_find_cmdline(entry->pid, comm);
657
658 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
659 " %ld.%03ldms (+%ld.%03ldms): ", comm,
660 entry->pid, iter->cpu, entry->flags,
661 entry->preempt_count, iter->idx,
662 ns2usecs(iter->ts),
663 abs_usecs / USEC_PER_MSEC,
664 abs_usecs % USEC_PER_MSEC,
665 rel_usecs / USEC_PER_MSEC,
666 rel_usecs % USEC_PER_MSEC);
667 } else {
668 ret = lat_print_generic(s, entry, iter->cpu);
669 if (ret)
670 ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
671 }
672
673 return ret;
674}
675
676static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
677
678static int task_state_char(unsigned long state)
679{
680 int bit = state ? __ffs(state) + 1 : 0;
681
682 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
683}
684
685/**
686 * ftrace_find_event - find a registered event
687 * @type: the type of event to look for
688 *
689 * Returns an event of type @type otherwise NULL
690 * Called with trace_event_read_lock() held.
691 */
692struct trace_event *ftrace_find_event(int type)
693{
694 struct trace_event *event;
695 struct hlist_node *n;
696 unsigned key;
697
698 key = type & (EVENT_HASHSIZE - 1);
699
700 hlist_for_each_entry(event, n, &event_hash[key], node) {
701 if (event->type == type)
702 return event;
703 }
704
705 return NULL;
706}
707
708static LIST_HEAD(ftrace_event_list);
709
710static int trace_search_list(struct list_head **list)
711{
712 struct trace_event *e;
713 int last = __TRACE_LAST_TYPE;
714
715 if (list_empty(&ftrace_event_list)) {
716 *list = &ftrace_event_list;
717 return last + 1;
718 }
719
720 /*
721 * We used up all possible max events,
722 * lets see if somebody freed one.
723 */
724 list_for_each_entry(e, &ftrace_event_list, list) {
725 if (e->type != last + 1)
726 break;
727 last++;
728 }
729
730 /* Did we used up all 65 thousand events??? */
731 if ((last + 1) > FTRACE_MAX_EVENT)
732 return 0;
733
734 *list = &e->list;
735 return last + 1;
736}
737
738void trace_event_read_lock(void)
739{
740 down_read(&trace_event_mutex);
741}
742
743void trace_event_read_unlock(void)
744{
745 up_read(&trace_event_mutex);
746}
747
748/**
749 * register_ftrace_event - register output for an event type
750 * @event: the event type to register
751 *
752 * Event types are stored in a hash and this hash is used to
753 * find a way to print an event. If the @event->type is set
754 * then it will use that type, otherwise it will assign a
755 * type to use.
756 *
757 * If you assign your own type, please make sure it is added
758 * to the trace_type enum in trace.h, to avoid collisions
759 * with the dynamic types.
760 *
761 * Returns the event type number or zero on error.
762 */
763int register_ftrace_event(struct trace_event *event)
764{
765 unsigned key;
766 int ret = 0;
767
768 down_write(&trace_event_mutex);
769
770 if (WARN_ON(!event))
771 goto out;
772
773 if (WARN_ON(!event->funcs))
774 goto out;
775
776 INIT_LIST_HEAD(&event->list);
777
778 if (!event->type) {
779 struct list_head *list = NULL;
780
781 if (next_event_type > FTRACE_MAX_EVENT) {
782
783 event->type = trace_search_list(&list);
784 if (!event->type)
785 goto out;
786
787 } else {
788
789 event->type = next_event_type++;
790 list = &ftrace_event_list;
791 }
792
793 if (WARN_ON(ftrace_find_event(event->type)))
794 goto out;
795
796 list_add_tail(&event->list, list);
797
798 } else if (event->type > __TRACE_LAST_TYPE) {
799 printk(KERN_WARNING "Need to add type to trace.h\n");
800 WARN_ON(1);
801 goto out;
802 } else {
803 /* Is this event already used */
804 if (ftrace_find_event(event->type))
805 goto out;
806 }
807
808 if (event->funcs->trace == NULL)
809 event->funcs->trace = trace_nop_print;
810 if (event->funcs->raw == NULL)
811 event->funcs->raw = trace_nop_print;
812 if (event->funcs->hex == NULL)
813 event->funcs->hex = trace_nop_print;
814 if (event->funcs->binary == NULL)
815 event->funcs->binary = trace_nop_print;
816
817 key = event->type & (EVENT_HASHSIZE - 1);
818
819 hlist_add_head(&event->node, &event_hash[key]);
820
821 ret = event->type;
822 out:
823 up_write(&trace_event_mutex);
824
825 return ret;
826}
827EXPORT_SYMBOL_GPL(register_ftrace_event);
828
829/*
830 * Used by module code with the trace_event_mutex held for write.
831 */
832int __unregister_ftrace_event(struct trace_event *event)
833{
834 hlist_del(&event->node);
835 list_del(&event->list);
836 return 0;
837}
838
839/**
840 * unregister_ftrace_event - remove a no longer used event
841 * @event: the event to remove
842 */
843int unregister_ftrace_event(struct trace_event *event)
844{
845 down_write(&trace_event_mutex);
846 __unregister_ftrace_event(event);
847 up_write(&trace_event_mutex);
848
849 return 0;
850}
851EXPORT_SYMBOL_GPL(unregister_ftrace_event);
852
853/*
854 * Standard events
855 */
856
857enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
858 struct trace_event *event)
859{
860 if (!trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type))
861 return TRACE_TYPE_PARTIAL_LINE;
862
863 return TRACE_TYPE_HANDLED;
864}
865
866/* TRACE_FN */
867static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
868 struct trace_event *event)
869{
870 struct ftrace_entry *field;
871 struct trace_seq *s = &iter->seq;
872
873 trace_assign_type(field, iter->ent);
874
875 if (!seq_print_ip_sym(s, field->ip, flags))
876 goto partial;
877
878 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
879 if (!trace_seq_printf(s, " <-"))
880 goto partial;
881 if (!seq_print_ip_sym(s,
882 field->parent_ip,
883 flags))
884 goto partial;
885 }
886 if (!trace_seq_printf(s, "\n"))
887 goto partial;
888
889 return TRACE_TYPE_HANDLED;
890
891 partial:
892 return TRACE_TYPE_PARTIAL_LINE;
893}
894
895static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
896 struct trace_event *event)
897{
898 struct ftrace_entry *field;
899
900 trace_assign_type(field, iter->ent);
901
902 if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
903 field->ip,
904 field->parent_ip))
905 return TRACE_TYPE_PARTIAL_LINE;
906
907 return TRACE_TYPE_HANDLED;
908}
909
910static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
911 struct trace_event *event)
912{
913 struct ftrace_entry *field;
914 struct trace_seq *s = &iter->seq;
915
916 trace_assign_type(field, iter->ent);
917
918 SEQ_PUT_HEX_FIELD_RET(s, field->ip);
919 SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
920
921 return TRACE_TYPE_HANDLED;
922}
923
924static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
925 struct trace_event *event)
926{
927 struct ftrace_entry *field;
928 struct trace_seq *s = &iter->seq;
929
930 trace_assign_type(field, iter->ent);
931
932 SEQ_PUT_FIELD_RET(s, field->ip);
933 SEQ_PUT_FIELD_RET(s, field->parent_ip);
934
935 return TRACE_TYPE_HANDLED;
936}
937
938static struct trace_event_functions trace_fn_funcs = {
939 .trace = trace_fn_trace,
940 .raw = trace_fn_raw,
941 .hex = trace_fn_hex,
942 .binary = trace_fn_bin,
943};
944
945static struct trace_event trace_fn_event = {
946 .type = TRACE_FN,
947 .funcs = &trace_fn_funcs,
948};
949
950/* TRACE_CTX an TRACE_WAKE */
951static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
952 char *delim)
953{
954 struct ctx_switch_entry *field;
955 char comm[TASK_COMM_LEN];
956 int S, T;
957
958
959 trace_assign_type(field, iter->ent);
960
961 T = task_state_char(field->next_state);
962 S = task_state_char(field->prev_state);
963 trace_find_cmdline(field->next_pid, comm);
964 if (!trace_seq_printf(&iter->seq,
965 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
966 field->prev_pid,
967 field->prev_prio,
968 S, delim,
969 field->next_cpu,
970 field->next_pid,
971 field->next_prio,
972 T, comm))
973 return TRACE_TYPE_PARTIAL_LINE;
974
975 return TRACE_TYPE_HANDLED;
976}
977
978static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
979 struct trace_event *event)
980{
981 return trace_ctxwake_print(iter, "==>");
982}
983
984static enum print_line_t trace_wake_print(struct trace_iterator *iter,
985 int flags, struct trace_event *event)
986{
987 return trace_ctxwake_print(iter, " +");
988}
989
990static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
991{
992 struct ctx_switch_entry *field;
993 int T;
994
995 trace_assign_type(field, iter->ent);
996
997 if (!S)
998 S = task_state_char(field->prev_state);
999 T = task_state_char(field->next_state);
1000 if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
1001 field->prev_pid,
1002 field->prev_prio,
1003 S,
1004 field->next_cpu,
1005 field->next_pid,
1006 field->next_prio,
1007 T))
1008 return TRACE_TYPE_PARTIAL_LINE;
1009
1010 return TRACE_TYPE_HANDLED;
1011}
1012
1013static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
1014 struct trace_event *event)
1015{
1016 return trace_ctxwake_raw(iter, 0);
1017}
1018
1019static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
1020 struct trace_event *event)
1021{
1022 return trace_ctxwake_raw(iter, '+');
1023}
1024
1025
1026static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
1027{
1028 struct ctx_switch_entry *field;
1029 struct trace_seq *s = &iter->seq;
1030 int T;
1031
1032 trace_assign_type(field, iter->ent);
1033
1034 if (!S)
1035 S = task_state_char(field->prev_state);
1036 T = task_state_char(field->next_state);
1037
1038 SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
1039 SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
1040 SEQ_PUT_HEX_FIELD_RET(s, S);
1041 SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
1042 SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
1043 SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
1044 SEQ_PUT_HEX_FIELD_RET(s, T);
1045
1046 return TRACE_TYPE_HANDLED;
1047}
1048
1049static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1050 struct trace_event *event)
1051{
1052 return trace_ctxwake_hex(iter, 0);
1053}
1054
1055static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1056 struct trace_event *event)
1057{
1058 return trace_ctxwake_hex(iter, '+');
1059}
1060
1061static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1062 int flags, struct trace_event *event)
1063{
1064 struct ctx_switch_entry *field;
1065 struct trace_seq *s = &iter->seq;
1066
1067 trace_assign_type(field, iter->ent);
1068
1069 SEQ_PUT_FIELD_RET(s, field->prev_pid);
1070 SEQ_PUT_FIELD_RET(s, field->prev_prio);
1071 SEQ_PUT_FIELD_RET(s, field->prev_state);
1072 SEQ_PUT_FIELD_RET(s, field->next_pid);
1073 SEQ_PUT_FIELD_RET(s, field->next_prio);
1074 SEQ_PUT_FIELD_RET(s, field->next_state);
1075
1076 return TRACE_TYPE_HANDLED;
1077}
1078
1079static struct trace_event_functions trace_ctx_funcs = {
1080 .trace = trace_ctx_print,
1081 .raw = trace_ctx_raw,
1082 .hex = trace_ctx_hex,
1083 .binary = trace_ctxwake_bin,
1084};
1085
1086static struct trace_event trace_ctx_event = {
1087 .type = TRACE_CTX,
1088 .funcs = &trace_ctx_funcs,
1089};
1090
1091static struct trace_event_functions trace_wake_funcs = {
1092 .trace = trace_wake_print,
1093 .raw = trace_wake_raw,
1094 .hex = trace_wake_hex,
1095 .binary = trace_ctxwake_bin,
1096};
1097
1098static struct trace_event trace_wake_event = {
1099 .type = TRACE_WAKE,
1100 .funcs = &trace_wake_funcs,
1101};
1102
1103/* TRACE_STACK */
1104
1105static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1106 int flags, struct trace_event *event)
1107{
1108 struct stack_entry *field;
1109 struct trace_seq *s = &iter->seq;
1110 unsigned long *p;
1111 unsigned long *end;
1112
1113 trace_assign_type(field, iter->ent);
1114 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1115
1116 if (!trace_seq_puts(s, "<stack trace>\n"))
1117 goto partial;
1118
1119 for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1120 if (!trace_seq_puts(s, " => "))
1121 goto partial;
1122
1123 if (!seq_print_ip_sym(s, *p, flags))
1124 goto partial;
1125 if (!trace_seq_puts(s, "\n"))
1126 goto partial;
1127 }
1128
1129 return TRACE_TYPE_HANDLED;
1130
1131 partial:
1132 return TRACE_TYPE_PARTIAL_LINE;
1133}
1134
1135static struct trace_event_functions trace_stack_funcs = {
1136 .trace = trace_stack_print,
1137};
1138
1139static struct trace_event trace_stack_event = {
1140 .type = TRACE_STACK,
1141 .funcs = &trace_stack_funcs,
1142};
1143
1144/* TRACE_USER_STACK */
1145static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1146 int flags, struct trace_event *event)
1147{
1148 struct userstack_entry *field;
1149 struct trace_seq *s = &iter->seq;
1150
1151 trace_assign_type(field, iter->ent);
1152
1153 if (!trace_seq_puts(s, "<user stack trace>\n"))
1154 goto partial;
1155
1156 if (!seq_print_userip_objs(field, s, flags))
1157 goto partial;
1158
1159 return TRACE_TYPE_HANDLED;
1160
1161 partial:
1162 return TRACE_TYPE_PARTIAL_LINE;
1163}
1164
1165static struct trace_event_functions trace_user_stack_funcs = {
1166 .trace = trace_user_stack_print,
1167};
1168
1169static struct trace_event trace_user_stack_event = {
1170 .type = TRACE_USER_STACK,
1171 .funcs = &trace_user_stack_funcs,
1172};
1173
1174/* TRACE_BPRINT */
1175static enum print_line_t
1176trace_bprint_print(struct trace_iterator *iter, int flags,
1177 struct trace_event *event)
1178{
1179 struct trace_entry *entry = iter->ent;
1180 struct trace_seq *s = &iter->seq;
1181 struct bprint_entry *field;
1182
1183 trace_assign_type(field, entry);
1184
1185 if (!seq_print_ip_sym(s, field->ip, flags))
1186 goto partial;
1187
1188 if (!trace_seq_puts(s, ": "))
1189 goto partial;
1190
1191 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1192 goto partial;
1193
1194 return TRACE_TYPE_HANDLED;
1195
1196 partial:
1197 return TRACE_TYPE_PARTIAL_LINE;
1198}
1199
1200
1201static enum print_line_t
1202trace_bprint_raw(struct trace_iterator *iter, int flags,
1203 struct trace_event *event)
1204{
1205 struct bprint_entry *field;
1206 struct trace_seq *s = &iter->seq;
1207
1208 trace_assign_type(field, iter->ent);
1209
1210 if (!trace_seq_printf(s, ": %lx : ", field->ip))
1211 goto partial;
1212
1213 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1214 goto partial;
1215
1216 return TRACE_TYPE_HANDLED;
1217
1218 partial:
1219 return TRACE_TYPE_PARTIAL_LINE;
1220}
1221
1222static struct trace_event_functions trace_bprint_funcs = {
1223 .trace = trace_bprint_print,
1224 .raw = trace_bprint_raw,
1225};
1226
1227static struct trace_event trace_bprint_event = {
1228 .type = TRACE_BPRINT,
1229 .funcs = &trace_bprint_funcs,
1230};
1231
1232/* TRACE_PRINT */
1233static enum print_line_t trace_print_print(struct trace_iterator *iter,
1234 int flags, struct trace_event *event)
1235{
1236 struct print_entry *field;
1237 struct trace_seq *s = &iter->seq;
1238
1239 trace_assign_type(field, iter->ent);
1240
1241 if (!seq_print_ip_sym(s, field->ip, flags))
1242 goto partial;
1243
1244 if (!trace_seq_printf(s, ": %s", field->buf))
1245 goto partial;
1246
1247 return TRACE_TYPE_HANDLED;
1248
1249 partial:
1250 return TRACE_TYPE_PARTIAL_LINE;
1251}
1252
1253static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1254 struct trace_event *event)
1255{
1256 struct print_entry *field;
1257
1258 trace_assign_type(field, iter->ent);
1259
1260 if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1261 goto partial;
1262
1263 return TRACE_TYPE_HANDLED;
1264
1265 partial:
1266 return TRACE_TYPE_PARTIAL_LINE;
1267}
1268
1269static struct trace_event_functions trace_print_funcs = {
1270 .trace = trace_print_print,
1271 .raw = trace_print_raw,
1272};
1273
1274static struct trace_event trace_print_event = {
1275 .type = TRACE_PRINT,
1276 .funcs = &trace_print_funcs,
1277};
1278
1279
1280static struct trace_event *events[] __initdata = {
1281 &trace_fn_event,
1282 &trace_ctx_event,
1283 &trace_wake_event,
1284 &trace_stack_event,
1285 &trace_user_stack_event,
1286 &trace_bprint_event,
1287 &trace_print_event,
1288 NULL
1289};
1290
1291__init static int init_events(void)
1292{
1293 struct trace_event *event;
1294 int i, ret;
1295
1296 for (i = 0; events[i]; i++) {
1297 event = events[i];
1298
1299 ret = register_ftrace_event(event);
1300 if (!ret) {
1301 printk(KERN_WARNING "event %d failed to register\n",
1302 event->type);
1303 WARN_ON_ONCE(1);
1304 }
1305 }
1306
1307 return 0;
1308}
1309device_initcall(init_events);