]> git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - kernel/trace/trace_output.c
projects / mirror_ubuntu-zesty-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge ath-next from ath.git
[mirror_ubuntu-zesty-kernel.git] / kernel / trace / trace_output.c
1 /*
2 * trace_output.c
3 *
4 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
5 *
6 */
7
8 #include <linux/module.h>
9 #include <linux/mutex.h>
10 #include <linux/ftrace.h>
11
12 #include "trace_output.h"
13
14 /* must be a power of 2 */
15 #define EVENT_HASHSIZE 128
16
17 DECLARE_RWSEM(trace_event_sem);
18
19 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
20
21 static int next_event_type = __TRACE_LAST_TYPE + 1;
22
23 enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
24 {
25 struct trace_seq *s = &iter->seq;
26 struct trace_entry *entry = iter->ent;
27 struct bputs_entry *field;
28
29 trace_assign_type(field, entry);
30
31 trace_seq_puts(s, field->str);
32
33 return trace_handle_return(s);
34 }
35
36 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
37 {
38 struct trace_seq *s = &iter->seq;
39 struct trace_entry *entry = iter->ent;
40 struct bprint_entry *field;
41
42 trace_assign_type(field, entry);
43
44 trace_seq_bprintf(s, field->fmt, field->buf);
45
46 return trace_handle_return(s);
47 }
48
49 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
50 {
51 struct trace_seq *s = &iter->seq;
52 struct trace_entry *entry = iter->ent;
53 struct print_entry *field;
54
55 trace_assign_type(field, entry);
56
57 trace_seq_puts(s, field->buf);
58
59 return trace_handle_return(s);
60 }
61
62 const char *
63 ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
64 unsigned long flags,
65 const struct trace_print_flags *flag_array)
66 {
67 unsigned long mask;
68 const char *str;
69 const char *ret = trace_seq_buffer_ptr(p);
70 int i, first = 1;
71
72 for (i = 0; flag_array[i].name && flags; i++) {
73
74 mask = flag_array[i].mask;
75 if ((flags & mask) != mask)
76 continue;
77
78 str = flag_array[i].name;
79 flags &= ~mask;
80 if (!first && delim)
81 trace_seq_puts(p, delim);
82 else
83 first = 0;
84 trace_seq_puts(p, str);
85 }
86
87 /* check for left over flags */
88 if (flags) {
89 if (!first && delim)
90 trace_seq_puts(p, delim);
91 trace_seq_printf(p, "0x%lx", flags);
92 }
93
94 trace_seq_putc(p, 0);
95
96 return ret;
97 }
98 EXPORT_SYMBOL(ftrace_print_flags_seq);
99
100 const char *
101 ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
102 const struct trace_print_flags *symbol_array)
103 {
104 int i;
105 const char *ret = trace_seq_buffer_ptr(p);
106
107 for (i = 0; symbol_array[i].name; i++) {
108
109 if (val != symbol_array[i].mask)
110 continue;
111
112 trace_seq_puts(p, symbol_array[i].name);
113 break;
114 }
115
116 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
117 trace_seq_printf(p, "0x%lx", val);
118
119 trace_seq_putc(p, 0);
120
121 return ret;
122 }
123 EXPORT_SYMBOL(ftrace_print_symbols_seq);
124
125 #if BITS_PER_LONG == 32
126 const char *
127 ftrace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
128 const struct trace_print_flags_u64 *symbol_array)
129 {
130 int i;
131 const char *ret = trace_seq_buffer_ptr(p);
132
133 for (i = 0; symbol_array[i].name; i++) {
134
135 if (val != symbol_array[i].mask)
136 continue;
137
138 trace_seq_puts(p, symbol_array[i].name);
139 break;
140 }
141
142 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
143 trace_seq_printf(p, "0x%llx", val);
144
145 trace_seq_putc(p, 0);
146
147 return ret;
148 }
149 EXPORT_SYMBOL(ftrace_print_symbols_seq_u64);
150 #endif
151
152 const char *
153 ftrace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
154 unsigned int bitmask_size)
155 {
156 const char *ret = trace_seq_buffer_ptr(p);
157
158 trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8);
159 trace_seq_putc(p, 0);
160
161 return ret;
162 }
163 EXPORT_SYMBOL_GPL(ftrace_print_bitmask_seq);
164
165 const char *
166 ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
167 {
168 int i;
169 const char *ret = trace_seq_buffer_ptr(p);
170
171 for (i = 0; i < buf_len; i++)
172 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
173
174 trace_seq_putc(p, 0);
175
176 return ret;
177 }
178 EXPORT_SYMBOL(ftrace_print_hex_seq);
179
180 const char *
181 ftrace_print_array_seq(struct trace_seq *p, const void *buf, int buf_len,
182 size_t el_size)
183 {
184 const char *ret = trace_seq_buffer_ptr(p);
185 const char *prefix = "";
186 void *ptr = (void *)buf;
187
188 trace_seq_putc(p, '{');
189
190 while (ptr < buf + buf_len) {
191 switch (el_size) {
192 case 1:
193 trace_seq_printf(p, "%s0x%x", prefix,
194 *(u8 *)ptr);
195 break;
196 case 2:
197 trace_seq_printf(p, "%s0x%x", prefix,
198 *(u16 *)ptr);
199 break;
200 case 4:
201 trace_seq_printf(p, "%s0x%x", prefix,
202 *(u32 *)ptr);
203 break;
204 case 8:
205 trace_seq_printf(p, "%s0x%llx", prefix,
206 *(u64 *)ptr);
207 break;
208 default:
209 trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
210 *(u8 *)ptr);
211 el_size = 1;
212 }
213 prefix = ",";
214 ptr += el_size;
215 }
216
217 trace_seq_putc(p, '}');
218 trace_seq_putc(p, 0);
219
220 return ret;
221 }
222 EXPORT_SYMBOL(ftrace_print_array_seq);
223
224 int ftrace_raw_output_prep(struct trace_iterator *iter,
225 struct trace_event *trace_event)
226 {
227 struct ftrace_event_call *event;
228 struct trace_seq *s = &iter->seq;
229 struct trace_seq *p = &iter->tmp_seq;
230 struct trace_entry *entry;
231
232 event = container_of(trace_event, struct ftrace_event_call, event);
233 entry = iter->ent;
234
235 if (entry->type != event->event.type) {
236 WARN_ON_ONCE(1);
237 return TRACE_TYPE_UNHANDLED;
238 }
239
240 trace_seq_init(p);
241 trace_seq_printf(s, "%s: ", ftrace_event_name(event));
242
243 return trace_handle_return(s);
244 }
245 EXPORT_SYMBOL(ftrace_raw_output_prep);
246
247 static int ftrace_output_raw(struct trace_iterator *iter, char *name,
248 char *fmt, va_list ap)
249 {
250 struct trace_seq *s = &iter->seq;
251
252 trace_seq_printf(s, "%s: ", name);
253 trace_seq_vprintf(s, fmt, ap);
254
255 return trace_handle_return(s);
256 }
257
258 int ftrace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
259 {
260 va_list ap;
261 int ret;
262
263 va_start(ap, fmt);
264 ret = ftrace_output_raw(iter, name, fmt, ap);
265 va_end(ap);
266
267 return ret;
268 }
269 EXPORT_SYMBOL_GPL(ftrace_output_call);
270
271 #ifdef CONFIG_KRETPROBES
272 static inline const char *kretprobed(const char *name)
273 {
274 static const char tramp_name[] = "kretprobe_trampoline";
275 int size = sizeof(tramp_name);
276
277 if (strncmp(tramp_name, name, size) == 0)
278 return "[unknown/kretprobe'd]";
279 return name;
280 }
281 #else
282 static inline const char *kretprobed(const char *name)
283 {
284 return name;
285 }
286 #endif /* CONFIG_KRETPROBES */
287
288 static void
289 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
290 {
291 #ifdef CONFIG_KALLSYMS
292 char str[KSYM_SYMBOL_LEN];
293 const char *name;
294
295 kallsyms_lookup(address, NULL, NULL, NULL, str);
296
297 name = kretprobed(str);
298
299 trace_seq_printf(s, fmt, name);
300 #endif
301 }
302
303 static void
304 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
305 unsigned long address)
306 {
307 #ifdef CONFIG_KALLSYMS
308 char str[KSYM_SYMBOL_LEN];
309 const char *name;
310
311 sprint_symbol(str, address);
312 name = kretprobed(str);
313
314 trace_seq_printf(s, fmt, name);
315 #endif
316 }
317
318 #ifndef CONFIG_64BIT
319 # define IP_FMT "%08lx"
320 #else
321 # define IP_FMT "%016lx"
322 #endif
323
324 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
325 unsigned long ip, unsigned long sym_flags)
326 {
327 struct file *file = NULL;
328 unsigned long vmstart = 0;
329 int ret = 1;
330
331 if (s->full)
332 return 0;
333
334 if (mm) {
335 const struct vm_area_struct *vma;
336
337 down_read(&mm->mmap_sem);
338 vma = find_vma(mm, ip);
339 if (vma) {
340 file = vma->vm_file;
341 vmstart = vma->vm_start;
342 }
343 if (file) {
344 ret = trace_seq_path(s, &file->f_path);
345 if (ret)
346 trace_seq_printf(s, "[+0x%lx]",
347 ip - vmstart);
348 }
349 up_read(&mm->mmap_sem);
350 }
351 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
352 trace_seq_printf(s, " <" IP_FMT ">", ip);
353 return !trace_seq_has_overflowed(s);
354 }
355
356 int
357 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
358 unsigned long sym_flags)
359 {
360 struct mm_struct *mm = NULL;
361 unsigned int i;
362
363 if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
364 struct task_struct *task;
365 /*
366 * we do the lookup on the thread group leader,
367 * since individual threads might have already quit!
368 */
369 rcu_read_lock();
370 task = find_task_by_vpid(entry->tgid);
371 if (task)
372 mm = get_task_mm(task);
373 rcu_read_unlock();
374 }
375
376 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
377 unsigned long ip = entry->caller[i];
378
379 if (ip == ULONG_MAX || trace_seq_has_overflowed(s))
380 break;
381
382 trace_seq_puts(s, " => ");
383
384 if (!ip) {
385 trace_seq_puts(s, "??");
386 trace_seq_putc(s, '\n');
387 continue;
388 }
389
390 seq_print_user_ip(s, mm, ip, sym_flags);
391 trace_seq_putc(s, '\n');
392 }
393
394 if (mm)
395 mmput(mm);
396
397 return !trace_seq_has_overflowed(s);
398 }
399
400 int
401 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
402 {
403 if (!ip) {
404 trace_seq_putc(s, '0');
405 goto out;
406 }
407
408 if (sym_flags & TRACE_ITER_SYM_OFFSET)
409 seq_print_sym_offset(s, "%s", ip);
410 else
411 seq_print_sym_short(s, "%s", ip);
412
413 if (sym_flags & TRACE_ITER_SYM_ADDR)
414 trace_seq_printf(s, " <" IP_FMT ">", ip);
415
416 out:
417 return !trace_seq_has_overflowed(s);
418 }
419
420 /**
421 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
422 * @s: trace seq struct to write to
423 * @entry: The trace entry field from the ring buffer
424 *
425 * Prints the generic fields of irqs off, in hard or softirq, preempt
426 * count.
427 */
428 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
429 {
430 char hardsoft_irq;
431 char need_resched;
432 char irqs_off;
433 int hardirq;
434 int softirq;
435
436 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
437 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
438
439 irqs_off =
440 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
441 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
442 '.';
443
444 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
445 TRACE_FLAG_PREEMPT_RESCHED)) {
446 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
447 need_resched = 'N';
448 break;
449 case TRACE_FLAG_NEED_RESCHED:
450 need_resched = 'n';
451 break;
452 case TRACE_FLAG_PREEMPT_RESCHED:
453 need_resched = 'p';
454 break;
455 default:
456 need_resched = '.';
457 break;
458 }
459
460 hardsoft_irq =
461 (hardirq && softirq) ? 'H' :
462 hardirq ? 'h' :
463 softirq ? 's' :
464 '.';
465
466 trace_seq_printf(s, "%c%c%c",
467 irqs_off, need_resched, hardsoft_irq);
468
469 if (entry->preempt_count)
470 trace_seq_printf(s, "%x", entry->preempt_count);
471 else
472 trace_seq_putc(s, '.');
473
474 return !trace_seq_has_overflowed(s);
475 }
476
477 static int
478 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
479 {
480 char comm[TASK_COMM_LEN];
481
482 trace_find_cmdline(entry->pid, comm);
483
484 trace_seq_printf(s, "%8.8s-%-5d %3d",
485 comm, entry->pid, cpu);
486
487 return trace_print_lat_fmt(s, entry);
488 }
489
490 #undef MARK
491 #define MARK(v, s) {.val = v, .sym = s}
492 /* trace overhead mark */
493 static const struct trace_mark {
494 unsigned long long val; /* unit: nsec */
495 char sym;
496 } mark[] = {
497 MARK(1000000000ULL , '$'), /* 1 sec */
498 MARK(1000000ULL , '#'), /* 1000 usecs */
499 MARK(100000ULL , '!'), /* 100 usecs */
500 MARK(10000ULL , '+'), /* 10 usecs */
501 };
502 #undef MARK
503
504 char trace_find_mark(unsigned long long d)
505 {
506 int i;
507 int size = ARRAY_SIZE(mark);
508
509 for (i = 0; i < size; i++) {
510 if (d >= mark[i].val)
511 break;
512 }
513
514 return (i == size) ? ' ' : mark[i].sym;
515 }
516
517 static int
518 lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
519 {
520 unsigned long verbose = trace_flags & TRACE_ITER_VERBOSE;
521 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
522 unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start;
523 unsigned long long rel_ts = next_ts - iter->ts;
524 struct trace_seq *s = &iter->seq;
525
526 if (in_ns) {
527 abs_ts = ns2usecs(abs_ts);
528 rel_ts = ns2usecs(rel_ts);
529 }
530
531 if (verbose && in_ns) {
532 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
533 unsigned long abs_msec = (unsigned long)abs_ts;
534 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
535 unsigned long rel_msec = (unsigned long)rel_ts;
536
537 trace_seq_printf(
538 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
539 ns2usecs(iter->ts),
540 abs_msec, abs_usec,
541 rel_msec, rel_usec);
542
543 } else if (verbose && !in_ns) {
544 trace_seq_printf(
545 s, "[%016llx] %lld (+%lld): ",
546 iter->ts, abs_ts, rel_ts);
547
548 } else if (!verbose && in_ns) {
549 trace_seq_printf(
550 s, " %4lldus%c: ",
551 abs_ts,
552 trace_find_mark(rel_ts * NSEC_PER_USEC));
553
554 } else { /* !verbose && !in_ns */
555 trace_seq_printf(s, " %4lld: ", abs_ts);
556 }
557
558 return !trace_seq_has_overflowed(s);
559 }
560
561 int trace_print_context(struct trace_iterator *iter)
562 {
563 struct trace_seq *s = &iter->seq;
564 struct trace_entry *entry = iter->ent;
565 unsigned long long t;
566 unsigned long secs, usec_rem;
567 char comm[TASK_COMM_LEN];
568
569 trace_find_cmdline(entry->pid, comm);
570
571 trace_seq_printf(s, "%16s-%-5d [%03d] ",
572 comm, entry->pid, iter->cpu);
573
574 if (trace_flags & TRACE_ITER_IRQ_INFO)
575 trace_print_lat_fmt(s, entry);
576
577 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
578 t = ns2usecs(iter->ts);
579 usec_rem = do_div(t, USEC_PER_SEC);
580 secs = (unsigned long)t;
581 trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
582 } else
583 trace_seq_printf(s, " %12llu: ", iter->ts);
584
585 return !trace_seq_has_overflowed(s);
586 }
587
588 int trace_print_lat_context(struct trace_iterator *iter)
589 {
590 u64 next_ts;
591 /* trace_find_next_entry will reset ent_size */
592 int ent_size = iter->ent_size;
593 struct trace_seq *s = &iter->seq;
594 struct trace_entry *entry = iter->ent,
595 *next_entry = trace_find_next_entry(iter, NULL,
596 &next_ts);
597 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
598
599 /* Restore the original ent_size */
600 iter->ent_size = ent_size;
601
602 if (!next_entry)
603 next_ts = iter->ts;
604
605 if (verbose) {
606 char comm[TASK_COMM_LEN];
607
608 trace_find_cmdline(entry->pid, comm);
609
610 trace_seq_printf(
611 s, "%16s %5d %3d %d %08x %08lx ",
612 comm, entry->pid, iter->cpu, entry->flags,
613 entry->preempt_count, iter->idx);
614 } else {
615 lat_print_generic(s, entry, iter->cpu);
616 }
617
618 lat_print_timestamp(iter, next_ts);
619
620 return !trace_seq_has_overflowed(s);
621 }
622
623 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
624
625 static int task_state_char(unsigned long state)
626 {
627 int bit = state ? __ffs(state) + 1 : 0;
628
629 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
630 }
631
632 /**
633 * ftrace_find_event - find a registered event
634 * @type: the type of event to look for
635 *
636 * Returns an event of type @type otherwise NULL
637 * Called with trace_event_read_lock() held.
638 */
639 struct trace_event *ftrace_find_event(int type)
640 {
641 struct trace_event *event;
642 unsigned key;
643
644 key = type & (EVENT_HASHSIZE - 1);
645
646 hlist_for_each_entry(event, &event_hash[key], node) {
647 if (event->type == type)
648 return event;
649 }
650
651 return NULL;
652 }
653
654 static LIST_HEAD(ftrace_event_list);
655
656 static int trace_search_list(struct list_head **list)
657 {
658 struct trace_event *e;
659 int last = __TRACE_LAST_TYPE;
660
661 if (list_empty(&ftrace_event_list)) {
662 *list = &ftrace_event_list;
663 return last + 1;
664 }
665
666 /*
667 * We used up all possible max events,
668 * lets see if somebody freed one.
669 */
670 list_for_each_entry(e, &ftrace_event_list, list) {
671 if (e->type != last + 1)
672 break;
673 last++;
674 }
675
676 /* Did we used up all 65 thousand events??? */
677 if ((last + 1) > FTRACE_MAX_EVENT)
678 return 0;
679
680 *list = &e->list;
681 return last + 1;
682 }
683
684 void trace_event_read_lock(void)
685 {
686 down_read(&trace_event_sem);
687 }
688
689 void trace_event_read_unlock(void)
690 {
691 up_read(&trace_event_sem);
692 }
693
694 /**
695 * register_ftrace_event - register output for an event type
696 * @event: the event type to register
697 *
698 * Event types are stored in a hash and this hash is used to
699 * find a way to print an event. If the @event->type is set
700 * then it will use that type, otherwise it will assign a
701 * type to use.
702 *
703 * If you assign your own type, please make sure it is added
704 * to the trace_type enum in trace.h, to avoid collisions
705 * with the dynamic types.
706 *
707 * Returns the event type number or zero on error.
708 */
709 int register_ftrace_event(struct trace_event *event)
710 {
711 unsigned key;
712 int ret = 0;
713
714 down_write(&trace_event_sem);
715
716 if (WARN_ON(!event))
717 goto out;
718
719 if (WARN_ON(!event->funcs))
720 goto out;
721
722 INIT_LIST_HEAD(&event->list);
723
724 if (!event->type) {
725 struct list_head *list = NULL;
726
727 if (next_event_type > FTRACE_MAX_EVENT) {
728
729 event->type = trace_search_list(&list);
730 if (!event->type)
731 goto out;
732
733 } else {
734
735 event->type = next_event_type++;
736 list = &ftrace_event_list;
737 }
738
739 if (WARN_ON(ftrace_find_event(event->type)))
740 goto out;
741
742 list_add_tail(&event->list, list);
743
744 } else if (event->type > __TRACE_LAST_TYPE) {
745 printk(KERN_WARNING "Need to add type to trace.h\n");
746 WARN_ON(1);
747 goto out;
748 } else {
749 /* Is this event already used */
750 if (ftrace_find_event(event->type))
751 goto out;
752 }
753
754 if (event->funcs->trace == NULL)
755 event->funcs->trace = trace_nop_print;
756 if (event->funcs->raw == NULL)
757 event->funcs->raw = trace_nop_print;
758 if (event->funcs->hex == NULL)
759 event->funcs->hex = trace_nop_print;
760 if (event->funcs->binary == NULL)
761 event->funcs->binary = trace_nop_print;
762
763 key = event->type & (EVENT_HASHSIZE - 1);
764
765 hlist_add_head(&event->node, &event_hash[key]);
766
767 ret = event->type;
768 out:
769 up_write(&trace_event_sem);
770
771 return ret;
772 }
773 EXPORT_SYMBOL_GPL(register_ftrace_event);
774
775 /*
776 * Used by module code with the trace_event_sem held for write.
777 */
778 int __unregister_ftrace_event(struct trace_event *event)
779 {
780 hlist_del(&event->node);
781 list_del(&event->list);
782 return 0;
783 }
784
785 /**
786 * unregister_ftrace_event - remove a no longer used event
787 * @event: the event to remove
788 */
789 int unregister_ftrace_event(struct trace_event *event)
790 {
791 down_write(&trace_event_sem);
792 __unregister_ftrace_event(event);
793 up_write(&trace_event_sem);
794
795 return 0;
796 }
797 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
798
799 /*
800 * Standard events
801 */
802
803 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
804 struct trace_event *event)
805 {
806 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
807
808 return trace_handle_return(&iter->seq);
809 }
810
811 /* TRACE_FN */
812 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
813 struct trace_event *event)
814 {
815 struct ftrace_entry *field;
816 struct trace_seq *s = &iter->seq;
817
818 trace_assign_type(field, iter->ent);
819
820 seq_print_ip_sym(s, field->ip, flags);
821
822 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
823 trace_seq_puts(s, " <-");
824 seq_print_ip_sym(s, field->parent_ip, flags);
825 }
826
827 trace_seq_putc(s, '\n');
828
829 return trace_handle_return(s);
830 }
831
832 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
833 struct trace_event *event)
834 {
835 struct ftrace_entry *field;
836
837 trace_assign_type(field, iter->ent);
838
839 trace_seq_printf(&iter->seq, "%lx %lx\n",
840 field->ip,
841 field->parent_ip);
842
843 return trace_handle_return(&iter->seq);
844 }
845
846 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
847 struct trace_event *event)
848 {
849 struct ftrace_entry *field;
850 struct trace_seq *s = &iter->seq;
851
852 trace_assign_type(field, iter->ent);
853
854 SEQ_PUT_HEX_FIELD(s, field->ip);
855 SEQ_PUT_HEX_FIELD(s, field->parent_ip);
856
857 return trace_handle_return(s);
858 }
859
860 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
861 struct trace_event *event)
862 {
863 struct ftrace_entry *field;
864 struct trace_seq *s = &iter->seq;
865
866 trace_assign_type(field, iter->ent);
867
868 SEQ_PUT_FIELD(s, field->ip);
869 SEQ_PUT_FIELD(s, field->parent_ip);
870
871 return trace_handle_return(s);
872 }
873
874 static struct trace_event_functions trace_fn_funcs = {
875 .trace = trace_fn_trace,
876 .raw = trace_fn_raw,
877 .hex = trace_fn_hex,
878 .binary = trace_fn_bin,
879 };
880
881 static struct trace_event trace_fn_event = {
882 .type = TRACE_FN,
883 .funcs = &trace_fn_funcs,
884 };
885
886 /* TRACE_CTX an TRACE_WAKE */
887 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
888 char *delim)
889 {
890 struct ctx_switch_entry *field;
891 char comm[TASK_COMM_LEN];
892 int S, T;
893
894
895 trace_assign_type(field, iter->ent);
896
897 T = task_state_char(field->next_state);
898 S = task_state_char(field->prev_state);
899 trace_find_cmdline(field->next_pid, comm);
900 trace_seq_printf(&iter->seq,
901 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
902 field->prev_pid,
903 field->prev_prio,
904 S, delim,
905 field->next_cpu,
906 field->next_pid,
907 field->next_prio,
908 T, comm);
909
910 return trace_handle_return(&iter->seq);
911 }
912
913 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
914 struct trace_event *event)
915 {
916 return trace_ctxwake_print(iter, "==>");
917 }
918
919 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
920 int flags, struct trace_event *event)
921 {
922 return trace_ctxwake_print(iter, " +");
923 }
924
925 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
926 {
927 struct ctx_switch_entry *field;
928 int T;
929
930 trace_assign_type(field, iter->ent);
931
932 if (!S)
933 S = task_state_char(field->prev_state);
934 T = task_state_char(field->next_state);
935 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
936 field->prev_pid,
937 field->prev_prio,
938 S,
939 field->next_cpu,
940 field->next_pid,
941 field->next_prio,
942 T);
943
944 return trace_handle_return(&iter->seq);
945 }
946
947 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
948 struct trace_event *event)
949 {
950 return trace_ctxwake_raw(iter, 0);
951 }
952
953 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
954 struct trace_event *event)
955 {
956 return trace_ctxwake_raw(iter, '+');
957 }
958
959
960 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
961 {
962 struct ctx_switch_entry *field;
963 struct trace_seq *s = &iter->seq;
964 int T;
965
966 trace_assign_type(field, iter->ent);
967
968 if (!S)
969 S = task_state_char(field->prev_state);
970 T = task_state_char(field->next_state);
971
972 SEQ_PUT_HEX_FIELD(s, field->prev_pid);
973 SEQ_PUT_HEX_FIELD(s, field->prev_prio);
974 SEQ_PUT_HEX_FIELD(s, S);
975 SEQ_PUT_HEX_FIELD(s, field->next_cpu);
976 SEQ_PUT_HEX_FIELD(s, field->next_pid);
977 SEQ_PUT_HEX_FIELD(s, field->next_prio);
978 SEQ_PUT_HEX_FIELD(s, T);
979
980 return trace_handle_return(s);
981 }
982
983 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
984 struct trace_event *event)
985 {
986 return trace_ctxwake_hex(iter, 0);
987 }
988
989 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
990 struct trace_event *event)
991 {
992 return trace_ctxwake_hex(iter, '+');
993 }
994
995 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
996 int flags, struct trace_event *event)
997 {
998 struct ctx_switch_entry *field;
999 struct trace_seq *s = &iter->seq;
1000
1001 trace_assign_type(field, iter->ent);
1002
1003 SEQ_PUT_FIELD(s, field->prev_pid);
1004 SEQ_PUT_FIELD(s, field->prev_prio);
1005 SEQ_PUT_FIELD(s, field->prev_state);
1006 SEQ_PUT_FIELD(s, field->next_cpu);
1007 SEQ_PUT_FIELD(s, field->next_pid);
1008 SEQ_PUT_FIELD(s, field->next_prio);
1009 SEQ_PUT_FIELD(s, field->next_state);
1010
1011 return trace_handle_return(s);
1012 }
1013
1014 static struct trace_event_functions trace_ctx_funcs = {
1015 .trace = trace_ctx_print,
1016 .raw = trace_ctx_raw,
1017 .hex = trace_ctx_hex,
1018 .binary = trace_ctxwake_bin,
1019 };
1020
1021 static struct trace_event trace_ctx_event = {
1022 .type = TRACE_CTX,
1023 .funcs = &trace_ctx_funcs,
1024 };
1025
1026 static struct trace_event_functions trace_wake_funcs = {
1027 .trace = trace_wake_print,
1028 .raw = trace_wake_raw,
1029 .hex = trace_wake_hex,
1030 .binary = trace_ctxwake_bin,
1031 };
1032
1033 static struct trace_event trace_wake_event = {
1034 .type = TRACE_WAKE,
1035 .funcs = &trace_wake_funcs,
1036 };
1037
1038 /* TRACE_STACK */
1039
1040 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1041 int flags, struct trace_event *event)
1042 {
1043 struct stack_entry *field;
1044 struct trace_seq *s = &iter->seq;
1045 unsigned long *p;
1046 unsigned long *end;
1047
1048 trace_assign_type(field, iter->ent);
1049 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1050
1051 trace_seq_puts(s, "<stack trace>\n");
1052
1053 for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1054
1055 if (trace_seq_has_overflowed(s))
1056 break;
1057
1058 trace_seq_puts(s, " => ");
1059 seq_print_ip_sym(s, *p, flags);
1060 trace_seq_putc(s, '\n');
1061 }
1062
1063 return trace_handle_return(s);
1064 }
1065
1066 static struct trace_event_functions trace_stack_funcs = {
1067 .trace = trace_stack_print,
1068 };
1069
1070 static struct trace_event trace_stack_event = {
1071 .type = TRACE_STACK,
1072 .funcs = &trace_stack_funcs,
1073 };
1074
1075 /* TRACE_USER_STACK */
1076 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1077 int flags, struct trace_event *event)
1078 {
1079 struct userstack_entry *field;
1080 struct trace_seq *s = &iter->seq;
1081
1082 trace_assign_type(field, iter->ent);
1083
1084 trace_seq_puts(s, "<user stack trace>\n");
1085 seq_print_userip_objs(field, s, flags);
1086
1087 return trace_handle_return(s);
1088 }
1089
1090 static struct trace_event_functions trace_user_stack_funcs = {
1091 .trace = trace_user_stack_print,
1092 };
1093
1094 static struct trace_event trace_user_stack_event = {
1095 .type = TRACE_USER_STACK,
1096 .funcs = &trace_user_stack_funcs,
1097 };
1098
1099 /* TRACE_BPUTS */
1100 static enum print_line_t
1101 trace_bputs_print(struct trace_iterator *iter, int flags,
1102 struct trace_event *event)
1103 {
1104 struct trace_entry *entry = iter->ent;
1105 struct trace_seq *s = &iter->seq;
1106 struct bputs_entry *field;
1107
1108 trace_assign_type(field, entry);
1109
1110 seq_print_ip_sym(s, field->ip, flags);
1111 trace_seq_puts(s, ": ");
1112 trace_seq_puts(s, field->str);
1113
1114 return trace_handle_return(s);
1115 }
1116
1117
1118 static enum print_line_t
1119 trace_bputs_raw(struct trace_iterator *iter, int flags,
1120 struct trace_event *event)
1121 {
1122 struct bputs_entry *field;
1123 struct trace_seq *s = &iter->seq;
1124
1125 trace_assign_type(field, iter->ent);
1126
1127 trace_seq_printf(s, ": %lx : ", field->ip);
1128 trace_seq_puts(s, field->str);
1129
1130 return trace_handle_return(s);
1131 }
1132
1133 static struct trace_event_functions trace_bputs_funcs = {
1134 .trace = trace_bputs_print,
1135 .raw = trace_bputs_raw,
1136 };
1137
1138 static struct trace_event trace_bputs_event = {
1139 .type = TRACE_BPUTS,
1140 .funcs = &trace_bputs_funcs,
1141 };
1142
1143 /* TRACE_BPRINT */
1144 static enum print_line_t
1145 trace_bprint_print(struct trace_iterator *iter, int flags,
1146 struct trace_event *event)
1147 {
1148 struct trace_entry *entry = iter->ent;
1149 struct trace_seq *s = &iter->seq;
1150 struct bprint_entry *field;
1151
1152 trace_assign_type(field, entry);
1153
1154 seq_print_ip_sym(s, field->ip, flags);
1155 trace_seq_puts(s, ": ");
1156 trace_seq_bprintf(s, field->fmt, field->buf);
1157
1158 return trace_handle_return(s);
1159 }
1160
1161
1162 static enum print_line_t
1163 trace_bprint_raw(struct trace_iterator *iter, int flags,
1164 struct trace_event *event)
1165 {
1166 struct bprint_entry *field;
1167 struct trace_seq *s = &iter->seq;
1168
1169 trace_assign_type(field, iter->ent);
1170
1171 trace_seq_printf(s, ": %lx : ", field->ip);
1172 trace_seq_bprintf(s, field->fmt, field->buf);
1173
1174 return trace_handle_return(s);
1175 }
1176
1177 static struct trace_event_functions trace_bprint_funcs = {
1178 .trace = trace_bprint_print,
1179 .raw = trace_bprint_raw,
1180 };
1181
1182 static struct trace_event trace_bprint_event = {
1183 .type = TRACE_BPRINT,
1184 .funcs = &trace_bprint_funcs,
1185 };
1186
1187 /* TRACE_PRINT */
1188 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1189 int flags, struct trace_event *event)
1190 {
1191 struct print_entry *field;
1192 struct trace_seq *s = &iter->seq;
1193
1194 trace_assign_type(field, iter->ent);
1195
1196 seq_print_ip_sym(s, field->ip, flags);
1197 trace_seq_printf(s, ": %s", field->buf);
1198
1199 return trace_handle_return(s);
1200 }
1201
1202 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1203 struct trace_event *event)
1204 {
1205 struct print_entry *field;
1206
1207 trace_assign_type(field, iter->ent);
1208
1209 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1210
1211 return trace_handle_return(&iter->seq);
1212 }
1213
1214 static struct trace_event_functions trace_print_funcs = {
1215 .trace = trace_print_print,
1216 .raw = trace_print_raw,
1217 };
1218
1219 static struct trace_event trace_print_event = {
1220 .type = TRACE_PRINT,
1221 .funcs = &trace_print_funcs,
1222 };
1223
1224
1225 static struct trace_event *events[] __initdata = {
1226 &trace_fn_event,
1227 &trace_ctx_event,
1228 &trace_wake_event,
1229 &trace_stack_event,
1230 &trace_user_stack_event,
1231 &trace_bputs_event,
1232 &trace_bprint_event,
1233 &trace_print_event,
1234 NULL
1235 };
1236
1237 __init static int init_events(void)
1238 {
1239 struct trace_event *event;
1240 int i, ret;
1241
1242 for (i = 0; events[i]; i++) {
1243 event = events[i];
1244
1245 ret = register_ftrace_event(event);
1246 if (!ret) {
1247 printk(KERN_WARNING "event %d failed to register\n",
1248 event->type);
1249 WARN_ON_ONCE(1);
1250 }
1251 }
1252
1253 return 0;
1254 }
1255 early_initcall(init_events);
ubuntu-zesty-kernel mirror