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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#include <linux/module.h>
8#include <linux/mutex.h>
9#include <linux/ftrace.h>
10#include <linux/sched/clock.h>
11#include <linux/sched/mm.h>
12
13#include "trace_output.h"
14
15/* must be a power of 2 */
16#define EVENT_HASHSIZE 128
17
18DECLARE_RWSEM(trace_event_sem);
19
20static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
21
22static int next_event_type = __TRACE_LAST_TYPE + 1;
23
24enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
25{
26 struct trace_seq *s = &iter->seq;
27 struct trace_entry *entry = iter->ent;
28 struct bputs_entry *field;
29
30 trace_assign_type(field, entry);
31
32 trace_seq_puts(s, field->str);
33
34 return trace_handle_return(s);
35}
36
37enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
38{
39 struct trace_seq *s = &iter->seq;
40 struct trace_entry *entry = iter->ent;
41 struct bprint_entry *field;
42
43 trace_assign_type(field, entry);
44
45 trace_seq_bprintf(s, field->fmt, field->buf);
46
47 return trace_handle_return(s);
48}
49
50enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
51{
52 struct trace_seq *s = &iter->seq;
53 struct trace_entry *entry = iter->ent;
54 struct print_entry *field;
55
56 trace_assign_type(field, entry);
57
58 trace_seq_puts(s, field->buf);
59
60 return trace_handle_return(s);
61}
62
63const char *
64trace_print_flags_seq(struct trace_seq *p, const char *delim,
65 unsigned long flags,
66 const struct trace_print_flags *flag_array)
67{
68 unsigned long mask;
69 const char *str;
70 const char *ret = trace_seq_buffer_ptr(p);
71 int i, first = 1;
72
73 for (i = 0; flag_array[i].name && flags; i++) {
74
75 mask = flag_array[i].mask;
76 if ((flags & mask) != mask)
77 continue;
78
79 str = flag_array[i].name;
80 flags &= ~mask;
81 if (!first && delim)
82 trace_seq_puts(p, delim);
83 else
84 first = 0;
85 trace_seq_puts(p, str);
86 }
87
88 /* check for left over flags */
89 if (flags) {
90 if (!first && delim)
91 trace_seq_puts(p, delim);
92 trace_seq_printf(p, "0x%lx", flags);
93 }
94
95 trace_seq_putc(p, 0);
96
97 return ret;
98}
99EXPORT_SYMBOL(trace_print_flags_seq);
100
101const char *
102trace_print_symbols_seq(struct trace_seq *p, unsigned long val,
103 const struct trace_print_flags *symbol_array)
104{
105 int i;
106 const char *ret = trace_seq_buffer_ptr(p);
107
108 for (i = 0; symbol_array[i].name; i++) {
109
110 if (val != symbol_array[i].mask)
111 continue;
112
113 trace_seq_puts(p, symbol_array[i].name);
114 break;
115 }
116
117 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
118 trace_seq_printf(p, "0x%lx", val);
119
120 trace_seq_putc(p, 0);
121
122 return ret;
123}
124EXPORT_SYMBOL(trace_print_symbols_seq);
125
126#if BITS_PER_LONG == 32
127const char *
128trace_print_flags_seq_u64(struct trace_seq *p, const char *delim,
129 unsigned long long flags,
130 const struct trace_print_flags_u64 *flag_array)
131{
132 unsigned long long mask;
133 const char *str;
134 const char *ret = trace_seq_buffer_ptr(p);
135 int i, first = 1;
136
137 for (i = 0; flag_array[i].name && flags; i++) {
138
139 mask = flag_array[i].mask;
140 if ((flags & mask) != mask)
141 continue;
142
143 str = flag_array[i].name;
144 flags &= ~mask;
145 if (!first && delim)
146 trace_seq_puts(p, delim);
147 else
148 first = 0;
149 trace_seq_puts(p, str);
150 }
151
152 /* check for left over flags */
153 if (flags) {
154 if (!first && delim)
155 trace_seq_puts(p, delim);
156 trace_seq_printf(p, "0x%llx", flags);
157 }
158
159 trace_seq_putc(p, 0);
160
161 return ret;
162}
163EXPORT_SYMBOL(trace_print_flags_seq_u64);
164
165const char *
166trace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
167 const struct trace_print_flags_u64 *symbol_array)
168{
169 int i;
170 const char *ret = trace_seq_buffer_ptr(p);
171
172 for (i = 0; symbol_array[i].name; i++) {
173
174 if (val != symbol_array[i].mask)
175 continue;
176
177 trace_seq_puts(p, symbol_array[i].name);
178 break;
179 }
180
181 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
182 trace_seq_printf(p, "0x%llx", val);
183
184 trace_seq_putc(p, 0);
185
186 return ret;
187}
188EXPORT_SYMBOL(trace_print_symbols_seq_u64);
189#endif
190
191const char *
192trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
193 unsigned int bitmask_size)
194{
195 const char *ret = trace_seq_buffer_ptr(p);
196
197 trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8);
198 trace_seq_putc(p, 0);
199
200 return ret;
201}
202EXPORT_SYMBOL_GPL(trace_print_bitmask_seq);
203
204/**
205 * trace_print_hex_seq - print buffer as hex sequence
206 * @p: trace seq struct to write to
207 * @buf: The buffer to print
208 * @buf_len: Length of @buf in bytes
209 * @concatenate: Print @buf as single hex string or with spacing
210 *
211 * Prints the passed buffer as a hex sequence either as a whole,
212 * single hex string if @concatenate is true or with spacing after
213 * each byte in case @concatenate is false.
214 */
215const char *
216trace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len,
217 bool concatenate)
218{
219 int i;
220 const char *ret = trace_seq_buffer_ptr(p);
221
222 for (i = 0; i < buf_len; i++)
223 trace_seq_printf(p, "%s%2.2x", concatenate || i == 0 ? "" : " ",
224 buf[i]);
225 trace_seq_putc(p, 0);
226
227 return ret;
228}
229EXPORT_SYMBOL(trace_print_hex_seq);
230
231const char *
232trace_print_array_seq(struct trace_seq *p, const void *buf, int count,
233 size_t el_size)
234{
235 const char *ret = trace_seq_buffer_ptr(p);
236 const char *prefix = "";
237 void *ptr = (void *)buf;
238 size_t buf_len = count * el_size;
239
240 trace_seq_putc(p, '{');
241
242 while (ptr < buf + buf_len) {
243 switch (el_size) {
244 case 1:
245 trace_seq_printf(p, "%s0x%x", prefix,
246 *(u8 *)ptr);
247 break;
248 case 2:
249 trace_seq_printf(p, "%s0x%x", prefix,
250 *(u16 *)ptr);
251 break;
252 case 4:
253 trace_seq_printf(p, "%s0x%x", prefix,
254 *(u32 *)ptr);
255 break;
256 case 8:
257 trace_seq_printf(p, "%s0x%llx", prefix,
258 *(u64 *)ptr);
259 break;
260 default:
261 trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
262 *(u8 *)ptr);
263 el_size = 1;
264 }
265 prefix = ",";
266 ptr += el_size;
267 }
268
269 trace_seq_putc(p, '}');
270 trace_seq_putc(p, 0);
271
272 return ret;
273}
274EXPORT_SYMBOL(trace_print_array_seq);
275
276int trace_raw_output_prep(struct trace_iterator *iter,
277 struct trace_event *trace_event)
278{
279 struct trace_event_call *event;
280 struct trace_seq *s = &iter->seq;
281 struct trace_seq *p = &iter->tmp_seq;
282 struct trace_entry *entry;
283
284 event = container_of(trace_event, struct trace_event_call, event);
285 entry = iter->ent;
286
287 if (entry->type != event->event.type) {
288 WARN_ON_ONCE(1);
289 return TRACE_TYPE_UNHANDLED;
290 }
291
292 trace_seq_init(p);
293 trace_seq_printf(s, "%s: ", trace_event_name(event));
294
295 return trace_handle_return(s);
296}
297EXPORT_SYMBOL(trace_raw_output_prep);
298
299static int trace_output_raw(struct trace_iterator *iter, char *name,
300 char *fmt, va_list ap)
301{
302 struct trace_seq *s = &iter->seq;
303
304 trace_seq_printf(s, "%s: ", name);
305 trace_seq_vprintf(s, fmt, ap);
306
307 return trace_handle_return(s);
308}
309
310int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
311{
312 va_list ap;
313 int ret;
314
315 va_start(ap, fmt);
316 ret = trace_output_raw(iter, name, fmt, ap);
317 va_end(ap);
318
319 return ret;
320}
321EXPORT_SYMBOL_GPL(trace_output_call);
322
323#ifdef CONFIG_KRETPROBES
324static inline const char *kretprobed(const char *name)
325{
326 static const char tramp_name[] = "kretprobe_trampoline";
327 int size = sizeof(tramp_name);
328
329 if (strncmp(tramp_name, name, size) == 0)
330 return "[unknown/kretprobe'd]";
331 return name;
332}
333#else
334static inline const char *kretprobed(const char *name)
335{
336 return name;
337}
338#endif /* CONFIG_KRETPROBES */
339
340static void
341seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
342{
343 char str[KSYM_SYMBOL_LEN];
344#ifdef CONFIG_KALLSYMS
345 const char *name;
346
347 kallsyms_lookup(address, NULL, NULL, NULL, str);
348
349 name = kretprobed(str);
350
351 if (name && strlen(name)) {
352 trace_seq_printf(s, fmt, name);
353 return;
354 }
355#endif
356 snprintf(str, KSYM_SYMBOL_LEN, "0x%08lx", address);
357 trace_seq_printf(s, fmt, str);
358}
359
360static void
361seq_print_sym_offset(struct trace_seq *s, const char *fmt,
362 unsigned long address)
363{
364 char str[KSYM_SYMBOL_LEN];
365#ifdef CONFIG_KALLSYMS
366 const char *name;
367
368 sprint_symbol(str, address);
369 name = kretprobed(str);
370
371 if (name && strlen(name)) {
372 trace_seq_printf(s, fmt, name);
373 return;
374 }
375#endif
376 snprintf(str, KSYM_SYMBOL_LEN, "0x%08lx", address);
377 trace_seq_printf(s, fmt, str);
378}
379
380#ifndef CONFIG_64BIT
381# define IP_FMT "%08lx"
382#else
383# define IP_FMT "%016lx"
384#endif
385
386static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
387 unsigned long ip, unsigned long sym_flags)
388{
389 struct file *file = NULL;
390 unsigned long vmstart = 0;
391 int ret = 1;
392
393 if (s->full)
394 return 0;
395
396 if (mm) {
397 const struct vm_area_struct *vma;
398
399 down_read(&mm->mmap_sem);
400 vma = find_vma(mm, ip);
401 if (vma) {
402 file = vma->vm_file;
403 vmstart = vma->vm_start;
404 }
405 if (file) {
406 ret = trace_seq_path(s, &file->f_path);
407 if (ret)
408 trace_seq_printf(s, "[+0x%lx]",
409 ip - vmstart);
410 }
411 up_read(&mm->mmap_sem);
412 }
413 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
414 trace_seq_printf(s, " <" IP_FMT ">", ip);
415 return !trace_seq_has_overflowed(s);
416}
417
418int
419seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
420{
421 if (!ip) {
422 trace_seq_putc(s, '0');
423 goto out;
424 }
425
426 if (sym_flags & TRACE_ITER_SYM_OFFSET)
427 seq_print_sym_offset(s, "%s", ip);
428 else
429 seq_print_sym_short(s, "%s", ip);
430
431 if (sym_flags & TRACE_ITER_SYM_ADDR)
432 trace_seq_printf(s, " <" IP_FMT ">", ip);
433
434 out:
435 return !trace_seq_has_overflowed(s);
436}
437
438/**
439 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
440 * @s: trace seq struct to write to
441 * @entry: The trace entry field from the ring buffer
442 *
443 * Prints the generic fields of irqs off, in hard or softirq, preempt
444 * count.
445 */
446int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
447{
448 char hardsoft_irq;
449 char need_resched;
450 char irqs_off;
451 int hardirq;
452 int softirq;
453 int nmi;
454
455 nmi = entry->flags & TRACE_FLAG_NMI;
456 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
457 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
458
459 irqs_off =
460 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
461 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
462 '.';
463
464 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
465 TRACE_FLAG_PREEMPT_RESCHED)) {
466 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
467 need_resched = 'N';
468 break;
469 case TRACE_FLAG_NEED_RESCHED:
470 need_resched = 'n';
471 break;
472 case TRACE_FLAG_PREEMPT_RESCHED:
473 need_resched = 'p';
474 break;
475 default:
476 need_resched = '.';
477 break;
478 }
479
480 hardsoft_irq =
481 (nmi && hardirq) ? 'Z' :
482 nmi ? 'z' :
483 (hardirq && softirq) ? 'H' :
484 hardirq ? 'h' :
485 softirq ? 's' :
486 '.' ;
487
488 trace_seq_printf(s, "%c%c%c",
489 irqs_off, need_resched, hardsoft_irq);
490
491 if (entry->preempt_count)
492 trace_seq_printf(s, "%x", entry->preempt_count);
493 else
494 trace_seq_putc(s, '.');
495
496 return !trace_seq_has_overflowed(s);
497}
498
499static int
500lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
501{
502 char comm[TASK_COMM_LEN];
503
504 trace_find_cmdline(entry->pid, comm);
505
506 trace_seq_printf(s, "%8.8s-%-5d %3d",
507 comm, entry->pid, cpu);
508
509 return trace_print_lat_fmt(s, entry);
510}
511
512#undef MARK
513#define MARK(v, s) {.val = v, .sym = s}
514/* trace overhead mark */
515static const struct trace_mark {
516 unsigned long long val; /* unit: nsec */
517 char sym;
518} mark[] = {
519 MARK(1000000000ULL , '$'), /* 1 sec */
520 MARK(100000000ULL , '@'), /* 100 msec */
521 MARK(10000000ULL , '*'), /* 10 msec */
522 MARK(1000000ULL , '#'), /* 1000 usecs */
523 MARK(100000ULL , '!'), /* 100 usecs */
524 MARK(10000ULL , '+'), /* 10 usecs */
525};
526#undef MARK
527
528char trace_find_mark(unsigned long long d)
529{
530 int i;
531 int size = ARRAY_SIZE(mark);
532
533 for (i = 0; i < size; i++) {
534 if (d > mark[i].val)
535 break;
536 }
537
538 return (i == size) ? ' ' : mark[i].sym;
539}
540
541static int
542lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
543{
544 struct trace_array *tr = iter->tr;
545 unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
546 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
547 unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start;
548 unsigned long long rel_ts = next_ts - iter->ts;
549 struct trace_seq *s = &iter->seq;
550
551 if (in_ns) {
552 abs_ts = ns2usecs(abs_ts);
553 rel_ts = ns2usecs(rel_ts);
554 }
555
556 if (verbose && in_ns) {
557 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
558 unsigned long abs_msec = (unsigned long)abs_ts;
559 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
560 unsigned long rel_msec = (unsigned long)rel_ts;
561
562 trace_seq_printf(
563 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
564 ns2usecs(iter->ts),
565 abs_msec, abs_usec,
566 rel_msec, rel_usec);
567
568 } else if (verbose && !in_ns) {
569 trace_seq_printf(
570 s, "[%016llx] %lld (+%lld): ",
571 iter->ts, abs_ts, rel_ts);
572
573 } else if (!verbose && in_ns) {
574 trace_seq_printf(
575 s, " %4lldus%c: ",
576 abs_ts,
577 trace_find_mark(rel_ts * NSEC_PER_USEC));
578
579 } else { /* !verbose && !in_ns */
580 trace_seq_printf(s, " %4lld: ", abs_ts);
581 }
582
583 return !trace_seq_has_overflowed(s);
584}
585
586int trace_print_context(struct trace_iterator *iter)
587{
588 struct trace_array *tr = iter->tr;
589 struct trace_seq *s = &iter->seq;
590 struct trace_entry *entry = iter->ent;
591 unsigned long long t;
592 unsigned long secs, usec_rem;
593 char comm[TASK_COMM_LEN];
594
595 trace_find_cmdline(entry->pid, comm);
596
597 trace_seq_printf(s, "%16s-%-5d [%03d] ",
598 comm, entry->pid, iter->cpu);
599
600 if (tr->trace_flags & TRACE_ITER_RECORD_TGID) {
601 unsigned int tgid = trace_find_tgid(entry->pid);
602
603 if (!tgid)
604 trace_seq_printf(s, "(-----) ");
605 else
606 trace_seq_printf(s, "(%5d) ", tgid);
607 }
608
609 if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
610 trace_print_lat_fmt(s, entry);
611
612 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
613 t = ns2usecs(iter->ts);
614 usec_rem = do_div(t, USEC_PER_SEC);
615 secs = (unsigned long)t;
616 trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
617 } else
618 trace_seq_printf(s, " %12llu: ", iter->ts);
619
620 return !trace_seq_has_overflowed(s);
621}
622
623int trace_print_lat_context(struct trace_iterator *iter)
624{
625 struct trace_array *tr = iter->tr;
626 /* trace_find_next_entry will reset ent_size */
627 int ent_size = iter->ent_size;
628 struct trace_seq *s = &iter->seq;
629 u64 next_ts;
630 struct trace_entry *entry = iter->ent,
631 *next_entry = trace_find_next_entry(iter, NULL,
632 &next_ts);
633 unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
634
635 /* Restore the original ent_size */
636 iter->ent_size = ent_size;
637
638 if (!next_entry)
639 next_ts = iter->ts;
640
641 if (verbose) {
642 char comm[TASK_COMM_LEN];
643
644 trace_find_cmdline(entry->pid, comm);
645
646 trace_seq_printf(
647 s, "%16s %5d %3d %d %08x %08lx ",
648 comm, entry->pid, iter->cpu, entry->flags,
649 entry->preempt_count, iter->idx);
650 } else {
651 lat_print_generic(s, entry, iter->cpu);
652 }
653
654 lat_print_timestamp(iter, next_ts);
655
656 return !trace_seq_has_overflowed(s);
657}
658
659/**
660 * ftrace_find_event - find a registered event
661 * @type: the type of event to look for
662 *
663 * Returns an event of type @type otherwise NULL
664 * Called with trace_event_read_lock() held.
665 */
666struct trace_event *ftrace_find_event(int type)
667{
668 struct trace_event *event;
669 unsigned key;
670
671 key = type & (EVENT_HASHSIZE - 1);
672
673 hlist_for_each_entry(event, &event_hash[key], node) {
674 if (event->type == type)
675 return event;
676 }
677
678 return NULL;
679}
680
681static LIST_HEAD(ftrace_event_list);
682
683static int trace_search_list(struct list_head **list)
684{
685 struct trace_event *e;
686 int last = __TRACE_LAST_TYPE;
687
688 if (list_empty(&ftrace_event_list)) {
689 *list = &ftrace_event_list;
690 return last + 1;
691 }
692
693 /*
694 * We used up all possible max events,
695 * lets see if somebody freed one.
696 */
697 list_for_each_entry(e, &ftrace_event_list, list) {
698 if (e->type != last + 1)
699 break;
700 last++;
701 }
702
703 /* Did we used up all 65 thousand events??? */
704 if ((last + 1) > TRACE_EVENT_TYPE_MAX)
705 return 0;
706
707 *list = &e->list;
708 return last + 1;
709}
710
711void trace_event_read_lock(void)
712{
713 down_read(&trace_event_sem);
714}
715
716void trace_event_read_unlock(void)
717{
718 up_read(&trace_event_sem);
719}
720
721/**
722 * register_trace_event - register output for an event type
723 * @event: the event type to register
724 *
725 * Event types are stored in a hash and this hash is used to
726 * find a way to print an event. If the @event->type is set
727 * then it will use that type, otherwise it will assign a
728 * type to use.
729 *
730 * If you assign your own type, please make sure it is added
731 * to the trace_type enum in trace.h, to avoid collisions
732 * with the dynamic types.
733 *
734 * Returns the event type number or zero on error.
735 */
736int register_trace_event(struct trace_event *event)
737{
738 unsigned key;
739 int ret = 0;
740
741 down_write(&trace_event_sem);
742
743 if (WARN_ON(!event))
744 goto out;
745
746 if (WARN_ON(!event->funcs))
747 goto out;
748
749 INIT_LIST_HEAD(&event->list);
750
751 if (!event->type) {
752 struct list_head *list = NULL;
753
754 if (next_event_type > TRACE_EVENT_TYPE_MAX) {
755
756 event->type = trace_search_list(&list);
757 if (!event->type)
758 goto out;
759
760 } else {
761
762 event->type = next_event_type++;
763 list = &ftrace_event_list;
764 }
765
766 if (WARN_ON(ftrace_find_event(event->type)))
767 goto out;
768
769 list_add_tail(&event->list, list);
770
771 } else if (event->type > __TRACE_LAST_TYPE) {
772 printk(KERN_WARNING "Need to add type to trace.h\n");
773 WARN_ON(1);
774 goto out;
775 } else {
776 /* Is this event already used */
777 if (ftrace_find_event(event->type))
778 goto out;
779 }
780
781 if (event->funcs->trace == NULL)
782 event->funcs->trace = trace_nop_print;
783 if (event->funcs->raw == NULL)
784 event->funcs->raw = trace_nop_print;
785 if (event->funcs->hex == NULL)
786 event->funcs->hex = trace_nop_print;
787 if (event->funcs->binary == NULL)
788 event->funcs->binary = trace_nop_print;
789
790 key = event->type & (EVENT_HASHSIZE - 1);
791
792 hlist_add_head(&event->node, &event_hash[key]);
793
794 ret = event->type;
795 out:
796 up_write(&trace_event_sem);
797
798 return ret;
799}
800EXPORT_SYMBOL_GPL(register_trace_event);
801
802/*
803 * Used by module code with the trace_event_sem held for write.
804 */
805int __unregister_trace_event(struct trace_event *event)
806{
807 hlist_del(&event->node);
808 list_del(&event->list);
809 return 0;
810}
811
812/**
813 * unregister_trace_event - remove a no longer used event
814 * @event: the event to remove
815 */
816int unregister_trace_event(struct trace_event *event)
817{
818 down_write(&trace_event_sem);
819 __unregister_trace_event(event);
820 up_write(&trace_event_sem);
821
822 return 0;
823}
824EXPORT_SYMBOL_GPL(unregister_trace_event);
825
826/*
827 * Standard events
828 */
829
830enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
831 struct trace_event *event)
832{
833 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
834
835 return trace_handle_return(&iter->seq);
836}
837
838/* TRACE_FN */
839static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
840 struct trace_event *event)
841{
842 struct ftrace_entry *field;
843 struct trace_seq *s = &iter->seq;
844
845 trace_assign_type(field, iter->ent);
846
847 seq_print_ip_sym(s, field->ip, flags);
848
849 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
850 trace_seq_puts(s, " <-");
851 seq_print_ip_sym(s, field->parent_ip, flags);
852 }
853
854 trace_seq_putc(s, '\n');
855
856 return trace_handle_return(s);
857}
858
859static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
860 struct trace_event *event)
861{
862 struct ftrace_entry *field;
863
864 trace_assign_type(field, iter->ent);
865
866 trace_seq_printf(&iter->seq, "%lx %lx\n",
867 field->ip,
868 field->parent_ip);
869
870 return trace_handle_return(&iter->seq);
871}
872
873static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
874 struct trace_event *event)
875{
876 struct ftrace_entry *field;
877 struct trace_seq *s = &iter->seq;
878
879 trace_assign_type(field, iter->ent);
880
881 SEQ_PUT_HEX_FIELD(s, field->ip);
882 SEQ_PUT_HEX_FIELD(s, field->parent_ip);
883
884 return trace_handle_return(s);
885}
886
887static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
888 struct trace_event *event)
889{
890 struct ftrace_entry *field;
891 struct trace_seq *s = &iter->seq;
892
893 trace_assign_type(field, iter->ent);
894
895 SEQ_PUT_FIELD(s, field->ip);
896 SEQ_PUT_FIELD(s, field->parent_ip);
897
898 return trace_handle_return(s);
899}
900
901static struct trace_event_functions trace_fn_funcs = {
902 .trace = trace_fn_trace,
903 .raw = trace_fn_raw,
904 .hex = trace_fn_hex,
905 .binary = trace_fn_bin,
906};
907
908static struct trace_event trace_fn_event = {
909 .type = TRACE_FN,
910 .funcs = &trace_fn_funcs,
911};
912
913/* TRACE_CTX an TRACE_WAKE */
914static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
915 char *delim)
916{
917 struct ctx_switch_entry *field;
918 char comm[TASK_COMM_LEN];
919 int S, T;
920
921
922 trace_assign_type(field, iter->ent);
923
924 T = task_index_to_char(field->next_state);
925 S = task_index_to_char(field->prev_state);
926 trace_find_cmdline(field->next_pid, comm);
927 trace_seq_printf(&iter->seq,
928 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
929 field->prev_pid,
930 field->prev_prio,
931 S, delim,
932 field->next_cpu,
933 field->next_pid,
934 field->next_prio,
935 T, comm);
936
937 return trace_handle_return(&iter->seq);
938}
939
940static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
941 struct trace_event *event)
942{
943 return trace_ctxwake_print(iter, "==>");
944}
945
946static enum print_line_t trace_wake_print(struct trace_iterator *iter,
947 int flags, struct trace_event *event)
948{
949 return trace_ctxwake_print(iter, " +");
950}
951
952static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
953{
954 struct ctx_switch_entry *field;
955 int T;
956
957 trace_assign_type(field, iter->ent);
958
959 if (!S)
960 S = task_index_to_char(field->prev_state);
961 T = task_index_to_char(field->next_state);
962 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
963 field->prev_pid,
964 field->prev_prio,
965 S,
966 field->next_cpu,
967 field->next_pid,
968 field->next_prio,
969 T);
970
971 return trace_handle_return(&iter->seq);
972}
973
974static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
975 struct trace_event *event)
976{
977 return trace_ctxwake_raw(iter, 0);
978}
979
980static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
981 struct trace_event *event)
982{
983 return trace_ctxwake_raw(iter, '+');
984}
985
986
987static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
988{
989 struct ctx_switch_entry *field;
990 struct trace_seq *s = &iter->seq;
991 int T;
992
993 trace_assign_type(field, iter->ent);
994
995 if (!S)
996 S = task_index_to_char(field->prev_state);
997 T = task_index_to_char(field->next_state);
998
999 SEQ_PUT_HEX_FIELD(s, field->prev_pid);
1000 SEQ_PUT_HEX_FIELD(s, field->prev_prio);
1001 SEQ_PUT_HEX_FIELD(s, S);
1002 SEQ_PUT_HEX_FIELD(s, field->next_cpu);
1003 SEQ_PUT_HEX_FIELD(s, field->next_pid);
1004 SEQ_PUT_HEX_FIELD(s, field->next_prio);
1005 SEQ_PUT_HEX_FIELD(s, T);
1006
1007 return trace_handle_return(s);
1008}
1009
1010static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1011 struct trace_event *event)
1012{
1013 return trace_ctxwake_hex(iter, 0);
1014}
1015
1016static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1017 struct trace_event *event)
1018{
1019 return trace_ctxwake_hex(iter, '+');
1020}
1021
1022static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1023 int flags, struct trace_event *event)
1024{
1025 struct ctx_switch_entry *field;
1026 struct trace_seq *s = &iter->seq;
1027
1028 trace_assign_type(field, iter->ent);
1029
1030 SEQ_PUT_FIELD(s, field->prev_pid);
1031 SEQ_PUT_FIELD(s, field->prev_prio);
1032 SEQ_PUT_FIELD(s, field->prev_state);
1033 SEQ_PUT_FIELD(s, field->next_cpu);
1034 SEQ_PUT_FIELD(s, field->next_pid);
1035 SEQ_PUT_FIELD(s, field->next_prio);
1036 SEQ_PUT_FIELD(s, field->next_state);
1037
1038 return trace_handle_return(s);
1039}
1040
1041static struct trace_event_functions trace_ctx_funcs = {
1042 .trace = trace_ctx_print,
1043 .raw = trace_ctx_raw,
1044 .hex = trace_ctx_hex,
1045 .binary = trace_ctxwake_bin,
1046};
1047
1048static struct trace_event trace_ctx_event = {
1049 .type = TRACE_CTX,
1050 .funcs = &trace_ctx_funcs,
1051};
1052
1053static struct trace_event_functions trace_wake_funcs = {
1054 .trace = trace_wake_print,
1055 .raw = trace_wake_raw,
1056 .hex = trace_wake_hex,
1057 .binary = trace_ctxwake_bin,
1058};
1059
1060static struct trace_event trace_wake_event = {
1061 .type = TRACE_WAKE,
1062 .funcs = &trace_wake_funcs,
1063};
1064
1065/* TRACE_STACK */
1066
1067static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1068 int flags, struct trace_event *event)
1069{
1070 struct stack_entry *field;
1071 struct trace_seq *s = &iter->seq;
1072 unsigned long *p;
1073 unsigned long *end;
1074
1075 trace_assign_type(field, iter->ent);
1076 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1077
1078 trace_seq_puts(s, "<stack trace>\n");
1079
1080 for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1081
1082 if (trace_seq_has_overflowed(s))
1083 break;
1084
1085 trace_seq_puts(s, " => ");
1086 seq_print_ip_sym(s, *p, flags);
1087 trace_seq_putc(s, '\n');
1088 }
1089
1090 return trace_handle_return(s);
1091}
1092
1093static struct trace_event_functions trace_stack_funcs = {
1094 .trace = trace_stack_print,
1095};
1096
1097static struct trace_event trace_stack_event = {
1098 .type = TRACE_STACK,
1099 .funcs = &trace_stack_funcs,
1100};
1101
1102/* TRACE_USER_STACK */
1103static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1104 int flags, struct trace_event *event)
1105{
1106 struct trace_array *tr = iter->tr;
1107 struct userstack_entry *field;
1108 struct trace_seq *s = &iter->seq;
1109 struct mm_struct *mm = NULL;
1110 unsigned int i;
1111
1112 trace_assign_type(field, iter->ent);
1113
1114 trace_seq_puts(s, "<user stack trace>\n");
1115
1116 if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
1117 struct task_struct *task;
1118 /*
1119 * we do the lookup on the thread group leader,
1120 * since individual threads might have already quit!
1121 */
1122 rcu_read_lock();
1123 task = find_task_by_vpid(field->tgid);
1124 if (task)
1125 mm = get_task_mm(task);
1126 rcu_read_unlock();
1127 }
1128
1129 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1130 unsigned long ip = field->caller[i];
1131
1132 if (ip == ULONG_MAX || trace_seq_has_overflowed(s))
1133 break;
1134
1135 trace_seq_puts(s, " => ");
1136
1137 if (!ip) {
1138 trace_seq_puts(s, "??");
1139 trace_seq_putc(s, '\n');
1140 continue;
1141 }
1142
1143 seq_print_user_ip(s, mm, ip, flags);
1144 trace_seq_putc(s, '\n');
1145 }
1146
1147 if (mm)
1148 mmput(mm);
1149
1150 return trace_handle_return(s);
1151}
1152
1153static struct trace_event_functions trace_user_stack_funcs = {
1154 .trace = trace_user_stack_print,
1155};
1156
1157static struct trace_event trace_user_stack_event = {
1158 .type = TRACE_USER_STACK,
1159 .funcs = &trace_user_stack_funcs,
1160};
1161
1162/* TRACE_HWLAT */
1163static enum print_line_t
1164trace_hwlat_print(struct trace_iterator *iter, int flags,
1165 struct trace_event *event)
1166{
1167 struct trace_entry *entry = iter->ent;
1168 struct trace_seq *s = &iter->seq;
1169 struct hwlat_entry *field;
1170
1171 trace_assign_type(field, entry);
1172
1173 trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld",
1174 field->seqnum,
1175 field->duration,
1176 field->outer_duration,
1177 (long long)field->timestamp.tv_sec,
1178 field->timestamp.tv_nsec);
1179
1180 if (field->nmi_count) {
1181 /*
1182 * The generic sched_clock() is not NMI safe, thus
1183 * we only record the count and not the time.
1184 */
1185 if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK))
1186 trace_seq_printf(s, " nmi-total:%llu",
1187 field->nmi_total_ts);
1188 trace_seq_printf(s, " nmi-count:%u",
1189 field->nmi_count);
1190 }
1191
1192 trace_seq_putc(s, '\n');
1193
1194 return trace_handle_return(s);
1195}
1196
1197
1198static enum print_line_t
1199trace_hwlat_raw(struct trace_iterator *iter, int flags,
1200 struct trace_event *event)
1201{
1202 struct hwlat_entry *field;
1203 struct trace_seq *s = &iter->seq;
1204
1205 trace_assign_type(field, iter->ent);
1206
1207 trace_seq_printf(s, "%llu %lld %lld %09ld %u\n",
1208 field->duration,
1209 field->outer_duration,
1210 (long long)field->timestamp.tv_sec,
1211 field->timestamp.tv_nsec,
1212 field->seqnum);
1213
1214 return trace_handle_return(s);
1215}
1216
1217static struct trace_event_functions trace_hwlat_funcs = {
1218 .trace = trace_hwlat_print,
1219 .raw = trace_hwlat_raw,
1220};
1221
1222static struct trace_event trace_hwlat_event = {
1223 .type = TRACE_HWLAT,
1224 .funcs = &trace_hwlat_funcs,
1225};
1226
1227/* TRACE_BPUTS */
1228static enum print_line_t
1229trace_bputs_print(struct trace_iterator *iter, int flags,
1230 struct trace_event *event)
1231{
1232 struct trace_entry *entry = iter->ent;
1233 struct trace_seq *s = &iter->seq;
1234 struct bputs_entry *field;
1235
1236 trace_assign_type(field, entry);
1237
1238 seq_print_ip_sym(s, field->ip, flags);
1239 trace_seq_puts(s, ": ");
1240 trace_seq_puts(s, field->str);
1241
1242 return trace_handle_return(s);
1243}
1244
1245
1246static enum print_line_t
1247trace_bputs_raw(struct trace_iterator *iter, int flags,
1248 struct trace_event *event)
1249{
1250 struct bputs_entry *field;
1251 struct trace_seq *s = &iter->seq;
1252
1253 trace_assign_type(field, iter->ent);
1254
1255 trace_seq_printf(s, ": %lx : ", field->ip);
1256 trace_seq_puts(s, field->str);
1257
1258 return trace_handle_return(s);
1259}
1260
1261static struct trace_event_functions trace_bputs_funcs = {
1262 .trace = trace_bputs_print,
1263 .raw = trace_bputs_raw,
1264};
1265
1266static struct trace_event trace_bputs_event = {
1267 .type = TRACE_BPUTS,
1268 .funcs = &trace_bputs_funcs,
1269};
1270
1271/* TRACE_BPRINT */
1272static enum print_line_t
1273trace_bprint_print(struct trace_iterator *iter, int flags,
1274 struct trace_event *event)
1275{
1276 struct trace_entry *entry = iter->ent;
1277 struct trace_seq *s = &iter->seq;
1278 struct bprint_entry *field;
1279
1280 trace_assign_type(field, entry);
1281
1282 seq_print_ip_sym(s, field->ip, flags);
1283 trace_seq_puts(s, ": ");
1284 trace_seq_bprintf(s, field->fmt, field->buf);
1285
1286 return trace_handle_return(s);
1287}
1288
1289
1290static enum print_line_t
1291trace_bprint_raw(struct trace_iterator *iter, int flags,
1292 struct trace_event *event)
1293{
1294 struct bprint_entry *field;
1295 struct trace_seq *s = &iter->seq;
1296
1297 trace_assign_type(field, iter->ent);
1298
1299 trace_seq_printf(s, ": %lx : ", field->ip);
1300 trace_seq_bprintf(s, field->fmt, field->buf);
1301
1302 return trace_handle_return(s);
1303}
1304
1305static struct trace_event_functions trace_bprint_funcs = {
1306 .trace = trace_bprint_print,
1307 .raw = trace_bprint_raw,
1308};
1309
1310static struct trace_event trace_bprint_event = {
1311 .type = TRACE_BPRINT,
1312 .funcs = &trace_bprint_funcs,
1313};
1314
1315/* TRACE_PRINT */
1316static enum print_line_t trace_print_print(struct trace_iterator *iter,
1317 int flags, struct trace_event *event)
1318{
1319 struct print_entry *field;
1320 struct trace_seq *s = &iter->seq;
1321
1322 trace_assign_type(field, iter->ent);
1323
1324 seq_print_ip_sym(s, field->ip, flags);
1325 trace_seq_printf(s, ": %s", field->buf);
1326
1327 return trace_handle_return(s);
1328}
1329
1330static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1331 struct trace_event *event)
1332{
1333 struct print_entry *field;
1334
1335 trace_assign_type(field, iter->ent);
1336
1337 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1338
1339 return trace_handle_return(&iter->seq);
1340}
1341
1342static struct trace_event_functions trace_print_funcs = {
1343 .trace = trace_print_print,
1344 .raw = trace_print_raw,
1345};
1346
1347static struct trace_event trace_print_event = {
1348 .type = TRACE_PRINT,
1349 .funcs = &trace_print_funcs,
1350};
1351
1352static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags,
1353 struct trace_event *event)
1354{
1355 struct raw_data_entry *field;
1356 int i;
1357
1358 trace_assign_type(field, iter->ent);
1359
1360 trace_seq_printf(&iter->seq, "# %x buf:", field->id);
1361
1362 for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++)
1363 trace_seq_printf(&iter->seq, " %02x",
1364 (unsigned char)field->buf[i]);
1365
1366 trace_seq_putc(&iter->seq, '\n');
1367
1368 return trace_handle_return(&iter->seq);
1369}
1370
1371static struct trace_event_functions trace_raw_data_funcs = {
1372 .trace = trace_raw_data,
1373 .raw = trace_raw_data,
1374};
1375
1376static struct trace_event trace_raw_data_event = {
1377 .type = TRACE_RAW_DATA,
1378 .funcs = &trace_raw_data_funcs,
1379};
1380
1381
1382static struct trace_event *events[] __initdata = {
1383 &trace_fn_event,
1384 &trace_ctx_event,
1385 &trace_wake_event,
1386 &trace_stack_event,
1387 &trace_user_stack_event,
1388 &trace_bputs_event,
1389 &trace_bprint_event,
1390 &trace_print_event,
1391 &trace_hwlat_event,
1392 &trace_raw_data_event,
1393 NULL
1394};
1395
1396__init static int init_events(void)
1397{
1398 struct trace_event *event;
1399 int i, ret;
1400
1401 for (i = 0; events[i]; i++) {
1402 event = events[i];
1403
1404 ret = register_trace_event(event);
1405 if (!ret) {
1406 printk(KERN_WARNING "event %d failed to register\n",
1407 event->type);
1408 WARN_ON_ONCE(1);
1409 }
1410 }
1411
1412 return 0;
1413}
1414early_initcall(init_events);