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Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
[deliverable/linux.git] / kernel / trace / trace_output.c
1 /*
2 * trace_output.c
3 *
4 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
5 *
6 */
7
8 #include <linux/module.h>
9 #include <linux/mutex.h>
10 #include <linux/ftrace.h>
11
12 #include "trace_output.h"
13
14 /* must be a power of 2 */
15 #define EVENT_HASHSIZE 128
16
17 DECLARE_RWSEM(trace_event_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 trace_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(trace_print_flags_seq);
99
100 const char *
101 trace_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(trace_print_symbols_seq);
124
125 #if BITS_PER_LONG == 32
126 const char *
127 trace_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(trace_print_symbols_seq_u64);
150 #endif
151
152 const char *
153 trace_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(trace_print_bitmask_seq);
164
165 const char *
166 trace_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(trace_print_hex_seq);
179
180 const char *
181 trace_print_array_seq(struct trace_seq *p, const void *buf, int count,
182 size_t el_size)
183 {
184 const char *ret = trace_seq_buffer_ptr(p);
185 const char *prefix = "";
186 void *ptr = (void *)buf;
187 size_t buf_len = count * el_size;
188
189 trace_seq_putc(p, '{');
190
191 while (ptr < buf + buf_len) {
192 switch (el_size) {
193 case 1:
194 trace_seq_printf(p, "%s0x%x", prefix,
195 *(u8 *)ptr);
196 break;
197 case 2:
198 trace_seq_printf(p, "%s0x%x", prefix,
199 *(u16 *)ptr);
200 break;
201 case 4:
202 trace_seq_printf(p, "%s0x%x", prefix,
203 *(u32 *)ptr);
204 break;
205 case 8:
206 trace_seq_printf(p, "%s0x%llx", prefix,
207 *(u64 *)ptr);
208 break;
209 default:
210 trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
211 *(u8 *)ptr);
212 el_size = 1;
213 }
214 prefix = ",";
215 ptr += el_size;
216 }
217
218 trace_seq_putc(p, '}');
219 trace_seq_putc(p, 0);
220
221 return ret;
222 }
223 EXPORT_SYMBOL(trace_print_array_seq);
224
225 int trace_raw_output_prep(struct trace_iterator *iter,
226 struct trace_event *trace_event)
227 {
228 struct trace_event_call *event;
229 struct trace_seq *s = &iter->seq;
230 struct trace_seq *p = &iter->tmp_seq;
231 struct trace_entry *entry;
232
233 event = container_of(trace_event, struct trace_event_call, event);
234 entry = iter->ent;
235
236 if (entry->type != event->event.type) {
237 WARN_ON_ONCE(1);
238 return TRACE_TYPE_UNHANDLED;
239 }
240
241 trace_seq_init(p);
242 trace_seq_printf(s, "%s: ", trace_event_name(event));
243
244 return trace_handle_return(s);
245 }
246 EXPORT_SYMBOL(trace_raw_output_prep);
247
248 static int trace_output_raw(struct trace_iterator *iter, char *name,
249 char *fmt, va_list ap)
250 {
251 struct trace_seq *s = &iter->seq;
252
253 trace_seq_printf(s, "%s: ", name);
254 trace_seq_vprintf(s, fmt, ap);
255
256 return trace_handle_return(s);
257 }
258
259 int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
260 {
261 va_list ap;
262 int ret;
263
264 va_start(ap, fmt);
265 ret = trace_output_raw(iter, name, fmt, ap);
266 va_end(ap);
267
268 return ret;
269 }
270 EXPORT_SYMBOL_GPL(trace_output_call);
271
272 #ifdef CONFIG_KRETPROBES
273 static inline const char *kretprobed(const char *name)
274 {
275 static const char tramp_name[] = "kretprobe_trampoline";
276 int size = sizeof(tramp_name);
277
278 if (strncmp(tramp_name, name, size) == 0)
279 return "[unknown/kretprobe'd]";
280 return name;
281 }
282 #else
283 static inline const char *kretprobed(const char *name)
284 {
285 return name;
286 }
287 #endif /* CONFIG_KRETPROBES */
288
289 static void
290 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
291 {
292 #ifdef CONFIG_KALLSYMS
293 char str[KSYM_SYMBOL_LEN];
294 const char *name;
295
296 kallsyms_lookup(address, NULL, NULL, NULL, str);
297
298 name = kretprobed(str);
299
300 trace_seq_printf(s, fmt, name);
301 #endif
302 }
303
304 static void
305 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
306 unsigned long address)
307 {
308 #ifdef CONFIG_KALLSYMS
309 char str[KSYM_SYMBOL_LEN];
310 const char *name;
311
312 sprint_symbol(str, address);
313 name = kretprobed(str);
314
315 trace_seq_printf(s, fmt, name);
316 #endif
317 }
318
319 #ifndef CONFIG_64BIT
320 # define IP_FMT "%08lx"
321 #else
322 # define IP_FMT "%016lx"
323 #endif
324
325 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
326 unsigned long ip, unsigned long sym_flags)
327 {
328 struct file *file = NULL;
329 unsigned long vmstart = 0;
330 int ret = 1;
331
332 if (s->full)
333 return 0;
334
335 if (mm) {
336 const struct vm_area_struct *vma;
337
338 down_read(&mm->mmap_sem);
339 vma = find_vma(mm, ip);
340 if (vma) {
341 file = vma->vm_file;
342 vmstart = vma->vm_start;
343 }
344 if (file) {
345 ret = trace_seq_path(s, &file->f_path);
346 if (ret)
347 trace_seq_printf(s, "[+0x%lx]",
348 ip - vmstart);
349 }
350 up_read(&mm->mmap_sem);
351 }
352 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
353 trace_seq_printf(s, " <" IP_FMT ">", ip);
354 return !trace_seq_has_overflowed(s);
355 }
356
357 int
358 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
359 unsigned long sym_flags)
360 {
361 struct mm_struct *mm = NULL;
362 unsigned int i;
363
364 if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
365 struct task_struct *task;
366 /*
367 * we do the lookup on the thread group leader,
368 * since individual threads might have already quit!
369 */
370 rcu_read_lock();
371 task = find_task_by_vpid(entry->tgid);
372 if (task)
373 mm = get_task_mm(task);
374 rcu_read_unlock();
375 }
376
377 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
378 unsigned long ip = entry->caller[i];
379
380 if (ip == ULONG_MAX || trace_seq_has_overflowed(s))
381 break;
382
383 trace_seq_puts(s, " => ");
384
385 if (!ip) {
386 trace_seq_puts(s, "??");
387 trace_seq_putc(s, '\n');
388 continue;
389 }
390
391 seq_print_user_ip(s, mm, ip, sym_flags);
392 trace_seq_putc(s, '\n');
393 }
394
395 if (mm)
396 mmput(mm);
397
398 return !trace_seq_has_overflowed(s);
399 }
400
401 int
402 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
403 {
404 if (!ip) {
405 trace_seq_putc(s, '0');
406 goto out;
407 }
408
409 if (sym_flags & TRACE_ITER_SYM_OFFSET)
410 seq_print_sym_offset(s, "%s", ip);
411 else
412 seq_print_sym_short(s, "%s", ip);
413
414 if (sym_flags & TRACE_ITER_SYM_ADDR)
415 trace_seq_printf(s, " <" IP_FMT ">", ip);
416
417 out:
418 return !trace_seq_has_overflowed(s);
419 }
420
421 /**
422 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
423 * @s: trace seq struct to write to
424 * @entry: The trace entry field from the ring buffer
425 *
426 * Prints the generic fields of irqs off, in hard or softirq, preempt
427 * count.
428 */
429 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
430 {
431 char hardsoft_irq;
432 char need_resched;
433 char irqs_off;
434 int hardirq;
435 int softirq;
436
437 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
438 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
439
440 irqs_off =
441 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
442 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
443 '.';
444
445 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
446 TRACE_FLAG_PREEMPT_RESCHED)) {
447 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
448 need_resched = 'N';
449 break;
450 case TRACE_FLAG_NEED_RESCHED:
451 need_resched = 'n';
452 break;
453 case TRACE_FLAG_PREEMPT_RESCHED:
454 need_resched = 'p';
455 break;
456 default:
457 need_resched = '.';
458 break;
459 }
460
461 hardsoft_irq =
462 (hardirq && softirq) ? 'H' :
463 hardirq ? 'h' :
464 softirq ? 's' :
465 '.';
466
467 trace_seq_printf(s, "%c%c%c",
468 irqs_off, need_resched, hardsoft_irq);
469
470 if (entry->preempt_count)
471 trace_seq_printf(s, "%x", entry->preempt_count);
472 else
473 trace_seq_putc(s, '.');
474
475 return !trace_seq_has_overflowed(s);
476 }
477
478 static int
479 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
480 {
481 char comm[TASK_COMM_LEN];
482
483 trace_find_cmdline(entry->pid, comm);
484
485 trace_seq_printf(s, "%8.8s-%-5d %3d",
486 comm, entry->pid, cpu);
487
488 return trace_print_lat_fmt(s, entry);
489 }
490
491 #undef MARK
492 #define MARK(v, s) {.val = v, .sym = s}
493 /* trace overhead mark */
494 static const struct trace_mark {
495 unsigned long long val; /* unit: nsec */
496 char sym;
497 } mark[] = {
498 MARK(1000000000ULL , '$'), /* 1 sec */
499 MARK(100000000ULL , '@'), /* 100 msec */
500 MARK(10000000ULL , '*'), /* 10 msec */
501 MARK(1000000ULL , '#'), /* 1000 usecs */
502 MARK(100000ULL , '!'), /* 100 usecs */
503 MARK(10000ULL , '+'), /* 10 usecs */
504 };
505 #undef MARK
506
507 char trace_find_mark(unsigned long long d)
508 {
509 int i;
510 int size = ARRAY_SIZE(mark);
511
512 for (i = 0; i < size; i++) {
513 if (d > mark[i].val)
514 break;
515 }
516
517 return (i == size) ? ' ' : mark[i].sym;
518 }
519
520 static int
521 lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
522 {
523 unsigned long verbose = trace_flags & TRACE_ITER_VERBOSE;
524 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
525 unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start;
526 unsigned long long rel_ts = next_ts - iter->ts;
527 struct trace_seq *s = &iter->seq;
528
529 if (in_ns) {
530 abs_ts = ns2usecs(abs_ts);
531 rel_ts = ns2usecs(rel_ts);
532 }
533
534 if (verbose && in_ns) {
535 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
536 unsigned long abs_msec = (unsigned long)abs_ts;
537 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
538 unsigned long rel_msec = (unsigned long)rel_ts;
539
540 trace_seq_printf(
541 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
542 ns2usecs(iter->ts),
543 abs_msec, abs_usec,
544 rel_msec, rel_usec);
545
546 } else if (verbose && !in_ns) {
547 trace_seq_printf(
548 s, "[%016llx] %lld (+%lld): ",
549 iter->ts, abs_ts, rel_ts);
550
551 } else if (!verbose && in_ns) {
552 trace_seq_printf(
553 s, " %4lldus%c: ",
554 abs_ts,
555 trace_find_mark(rel_ts * NSEC_PER_USEC));
556
557 } else { /* !verbose && !in_ns */
558 trace_seq_printf(s, " %4lld: ", abs_ts);
559 }
560
561 return !trace_seq_has_overflowed(s);
562 }
563
564 int trace_print_context(struct trace_iterator *iter)
565 {
566 struct trace_seq *s = &iter->seq;
567 struct trace_entry *entry = iter->ent;
568 unsigned long long t;
569 unsigned long secs, usec_rem;
570 char comm[TASK_COMM_LEN];
571
572 trace_find_cmdline(entry->pid, comm);
573
574 trace_seq_printf(s, "%16s-%-5d [%03d] ",
575 comm, entry->pid, iter->cpu);
576
577 if (trace_flags & TRACE_ITER_IRQ_INFO)
578 trace_print_lat_fmt(s, entry);
579
580 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
581 t = ns2usecs(iter->ts);
582 usec_rem = do_div(t, USEC_PER_SEC);
583 secs = (unsigned long)t;
584 trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
585 } else
586 trace_seq_printf(s, " %12llu: ", iter->ts);
587
588 return !trace_seq_has_overflowed(s);
589 }
590
591 int trace_print_lat_context(struct trace_iterator *iter)
592 {
593 u64 next_ts;
594 /* trace_find_next_entry will reset ent_size */
595 int ent_size = iter->ent_size;
596 struct trace_seq *s = &iter->seq;
597 struct trace_entry *entry = iter->ent,
598 *next_entry = trace_find_next_entry(iter, NULL,
599 &next_ts);
600 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
601
602 /* Restore the original ent_size */
603 iter->ent_size = ent_size;
604
605 if (!next_entry)
606 next_ts = iter->ts;
607
608 if (verbose) {
609 char comm[TASK_COMM_LEN];
610
611 trace_find_cmdline(entry->pid, comm);
612
613 trace_seq_printf(
614 s, "%16s %5d %3d %d %08x %08lx ",
615 comm, entry->pid, iter->cpu, entry->flags,
616 entry->preempt_count, iter->idx);
617 } else {
618 lat_print_generic(s, entry, iter->cpu);
619 }
620
621 lat_print_timestamp(iter, next_ts);
622
623 return !trace_seq_has_overflowed(s);
624 }
625
626 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
627
628 static int task_state_char(unsigned long state)
629 {
630 int bit = state ? __ffs(state) + 1 : 0;
631
632 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
633 }
634
635 /**
636 * ftrace_find_event - find a registered event
637 * @type: the type of event to look for
638 *
639 * Returns an event of type @type otherwise NULL
640 * Called with trace_event_read_lock() held.
641 */
642 struct trace_event *ftrace_find_event(int type)
643 {
644 struct trace_event *event;
645 unsigned key;
646
647 key = type & (EVENT_HASHSIZE - 1);
648
649 hlist_for_each_entry(event, &event_hash[key], node) {
650 if (event->type == type)
651 return event;
652 }
653
654 return NULL;
655 }
656
657 static LIST_HEAD(ftrace_event_list);
658
659 static int trace_search_list(struct list_head **list)
660 {
661 struct trace_event *e;
662 int last = __TRACE_LAST_TYPE;
663
664 if (list_empty(&ftrace_event_list)) {
665 *list = &ftrace_event_list;
666 return last + 1;
667 }
668
669 /*
670 * We used up all possible max events,
671 * lets see if somebody freed one.
672 */
673 list_for_each_entry(e, &ftrace_event_list, list) {
674 if (e->type != last + 1)
675 break;
676 last++;
677 }
678
679 /* Did we used up all 65 thousand events??? */
680 if ((last + 1) > TRACE_EVENT_TYPE_MAX)
681 return 0;
682
683 *list = &e->list;
684 return last + 1;
685 }
686
687 void trace_event_read_lock(void)
688 {
689 down_read(&trace_event_sem);
690 }
691
692 void trace_event_read_unlock(void)
693 {
694 up_read(&trace_event_sem);
695 }
696
697 /**
698 * register_trace_event - register output for an event type
699 * @event: the event type to register
700 *
701 * Event types are stored in a hash and this hash is used to
702 * find a way to print an event. If the @event->type is set
703 * then it will use that type, otherwise it will assign a
704 * type to use.
705 *
706 * If you assign your own type, please make sure it is added
707 * to the trace_type enum in trace.h, to avoid collisions
708 * with the dynamic types.
709 *
710 * Returns the event type number or zero on error.
711 */
712 int register_trace_event(struct trace_event *event)
713 {
714 unsigned key;
715 int ret = 0;
716
717 down_write(&trace_event_sem);
718
719 if (WARN_ON(!event))
720 goto out;
721
722 if (WARN_ON(!event->funcs))
723 goto out;
724
725 INIT_LIST_HEAD(&event->list);
726
727 if (!event->type) {
728 struct list_head *list = NULL;
729
730 if (next_event_type > TRACE_EVENT_TYPE_MAX) {
731
732 event->type = trace_search_list(&list);
733 if (!event->type)
734 goto out;
735
736 } else {
737
738 event->type = next_event_type++;
739 list = &ftrace_event_list;
740 }
741
742 if (WARN_ON(ftrace_find_event(event->type)))
743 goto out;
744
745 list_add_tail(&event->list, list);
746
747 } else if (event->type > __TRACE_LAST_TYPE) {
748 printk(KERN_WARNING "Need to add type to trace.h\n");
749 WARN_ON(1);
750 goto out;
751 } else {
752 /* Is this event already used */
753 if (ftrace_find_event(event->type))
754 goto out;
755 }
756
757 if (event->funcs->trace == NULL)
758 event->funcs->trace = trace_nop_print;
759 if (event->funcs->raw == NULL)
760 event->funcs->raw = trace_nop_print;
761 if (event->funcs->hex == NULL)
762 event->funcs->hex = trace_nop_print;
763 if (event->funcs->binary == NULL)
764 event->funcs->binary = trace_nop_print;
765
766 key = event->type & (EVENT_HASHSIZE - 1);
767
768 hlist_add_head(&event->node, &event_hash[key]);
769
770 ret = event->type;
771 out:
772 up_write(&trace_event_sem);
773
774 return ret;
775 }
776 EXPORT_SYMBOL_GPL(register_trace_event);
777
778 /*
779 * Used by module code with the trace_event_sem held for write.
780 */
781 int __unregister_trace_event(struct trace_event *event)
782 {
783 hlist_del(&event->node);
784 list_del(&event->list);
785 return 0;
786 }
787
788 /**
789 * unregister_trace_event - remove a no longer used event
790 * @event: the event to remove
791 */
792 int unregister_trace_event(struct trace_event *event)
793 {
794 down_write(&trace_event_sem);
795 __unregister_trace_event(event);
796 up_write(&trace_event_sem);
797
798 return 0;
799 }
800 EXPORT_SYMBOL_GPL(unregister_trace_event);
801
802 /*
803 * Standard events
804 */
805
806 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
807 struct trace_event *event)
808 {
809 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
810
811 return trace_handle_return(&iter->seq);
812 }
813
814 /* TRACE_FN */
815 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
816 struct trace_event *event)
817 {
818 struct ftrace_entry *field;
819 struct trace_seq *s = &iter->seq;
820
821 trace_assign_type(field, iter->ent);
822
823 seq_print_ip_sym(s, field->ip, flags);
824
825 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
826 trace_seq_puts(s, " <-");
827 seq_print_ip_sym(s, field->parent_ip, flags);
828 }
829
830 trace_seq_putc(s, '\n');
831
832 return trace_handle_return(s);
833 }
834
835 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
836 struct trace_event *event)
837 {
838 struct ftrace_entry *field;
839
840 trace_assign_type(field, iter->ent);
841
842 trace_seq_printf(&iter->seq, "%lx %lx\n",
843 field->ip,
844 field->parent_ip);
845
846 return trace_handle_return(&iter->seq);
847 }
848
849 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
850 struct trace_event *event)
851 {
852 struct ftrace_entry *field;
853 struct trace_seq *s = &iter->seq;
854
855 trace_assign_type(field, iter->ent);
856
857 SEQ_PUT_HEX_FIELD(s, field->ip);
858 SEQ_PUT_HEX_FIELD(s, field->parent_ip);
859
860 return trace_handle_return(s);
861 }
862
863 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
864 struct trace_event *event)
865 {
866 struct ftrace_entry *field;
867 struct trace_seq *s = &iter->seq;
868
869 trace_assign_type(field, iter->ent);
870
871 SEQ_PUT_FIELD(s, field->ip);
872 SEQ_PUT_FIELD(s, field->parent_ip);
873
874 return trace_handle_return(s);
875 }
876
877 static struct trace_event_functions trace_fn_funcs = {
878 .trace = trace_fn_trace,
879 .raw = trace_fn_raw,
880 .hex = trace_fn_hex,
881 .binary = trace_fn_bin,
882 };
883
884 static struct trace_event trace_fn_event = {
885 .type = TRACE_FN,
886 .funcs = &trace_fn_funcs,
887 };
888
889 /* TRACE_CTX an TRACE_WAKE */
890 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
891 char *delim)
892 {
893 struct ctx_switch_entry *field;
894 char comm[TASK_COMM_LEN];
895 int S, T;
896
897
898 trace_assign_type(field, iter->ent);
899
900 T = task_state_char(field->next_state);
901 S = task_state_char(field->prev_state);
902 trace_find_cmdline(field->next_pid, comm);
903 trace_seq_printf(&iter->seq,
904 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
905 field->prev_pid,
906 field->prev_prio,
907 S, delim,
908 field->next_cpu,
909 field->next_pid,
910 field->next_prio,
911 T, comm);
912
913 return trace_handle_return(&iter->seq);
914 }
915
916 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
917 struct trace_event *event)
918 {
919 return trace_ctxwake_print(iter, "==>");
920 }
921
922 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
923 int flags, struct trace_event *event)
924 {
925 return trace_ctxwake_print(iter, " +");
926 }
927
928 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
929 {
930 struct ctx_switch_entry *field;
931 int T;
932
933 trace_assign_type(field, iter->ent);
934
935 if (!S)
936 S = task_state_char(field->prev_state);
937 T = task_state_char(field->next_state);
938 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
939 field->prev_pid,
940 field->prev_prio,
941 S,
942 field->next_cpu,
943 field->next_pid,
944 field->next_prio,
945 T);
946
947 return trace_handle_return(&iter->seq);
948 }
949
950 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
951 struct trace_event *event)
952 {
953 return trace_ctxwake_raw(iter, 0);
954 }
955
956 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
957 struct trace_event *event)
958 {
959 return trace_ctxwake_raw(iter, '+');
960 }
961
962
963 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
964 {
965 struct ctx_switch_entry *field;
966 struct trace_seq *s = &iter->seq;
967 int T;
968
969 trace_assign_type(field, iter->ent);
970
971 if (!S)
972 S = task_state_char(field->prev_state);
973 T = task_state_char(field->next_state);
974
975 SEQ_PUT_HEX_FIELD(s, field->prev_pid);
976 SEQ_PUT_HEX_FIELD(s, field->prev_prio);
977 SEQ_PUT_HEX_FIELD(s, S);
978 SEQ_PUT_HEX_FIELD(s, field->next_cpu);
979 SEQ_PUT_HEX_FIELD(s, field->next_pid);
980 SEQ_PUT_HEX_FIELD(s, field->next_prio);
981 SEQ_PUT_HEX_FIELD(s, T);
982
983 return trace_handle_return(s);
984 }
985
986 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
987 struct trace_event *event)
988 {
989 return trace_ctxwake_hex(iter, 0);
990 }
991
992 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
993 struct trace_event *event)
994 {
995 return trace_ctxwake_hex(iter, '+');
996 }
997
998 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
999 int flags, struct trace_event *event)
1000 {
1001 struct ctx_switch_entry *field;
1002 struct trace_seq *s = &iter->seq;
1003
1004 trace_assign_type(field, iter->ent);
1005
1006 SEQ_PUT_FIELD(s, field->prev_pid);
1007 SEQ_PUT_FIELD(s, field->prev_prio);
1008 SEQ_PUT_FIELD(s, field->prev_state);
1009 SEQ_PUT_FIELD(s, field->next_cpu);
1010 SEQ_PUT_FIELD(s, field->next_pid);
1011 SEQ_PUT_FIELD(s, field->next_prio);
1012 SEQ_PUT_FIELD(s, field->next_state);
1013
1014 return trace_handle_return(s);
1015 }
1016
1017 static struct trace_event_functions trace_ctx_funcs = {
1018 .trace = trace_ctx_print,
1019 .raw = trace_ctx_raw,
1020 .hex = trace_ctx_hex,
1021 .binary = trace_ctxwake_bin,
1022 };
1023
1024 static struct trace_event trace_ctx_event = {
1025 .type = TRACE_CTX,
1026 .funcs = &trace_ctx_funcs,
1027 };
1028
1029 static struct trace_event_functions trace_wake_funcs = {
1030 .trace = trace_wake_print,
1031 .raw = trace_wake_raw,
1032 .hex = trace_wake_hex,
1033 .binary = trace_ctxwake_bin,
1034 };
1035
1036 static struct trace_event trace_wake_event = {
1037 .type = TRACE_WAKE,
1038 .funcs = &trace_wake_funcs,
1039 };
1040
1041 /* TRACE_STACK */
1042
1043 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1044 int flags, struct trace_event *event)
1045 {
1046 struct stack_entry *field;
1047 struct trace_seq *s = &iter->seq;
1048 unsigned long *p;
1049 unsigned long *end;
1050
1051 trace_assign_type(field, iter->ent);
1052 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1053
1054 trace_seq_puts(s, "<stack trace>\n");
1055
1056 for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1057
1058 if (trace_seq_has_overflowed(s))
1059 break;
1060
1061 trace_seq_puts(s, " => ");
1062 seq_print_ip_sym(s, *p, flags);
1063 trace_seq_putc(s, '\n');
1064 }
1065
1066 return trace_handle_return(s);
1067 }
1068
1069 static struct trace_event_functions trace_stack_funcs = {
1070 .trace = trace_stack_print,
1071 };
1072
1073 static struct trace_event trace_stack_event = {
1074 .type = TRACE_STACK,
1075 .funcs = &trace_stack_funcs,
1076 };
1077
1078 /* TRACE_USER_STACK */
1079 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1080 int flags, struct trace_event *event)
1081 {
1082 struct userstack_entry *field;
1083 struct trace_seq *s = &iter->seq;
1084
1085 trace_assign_type(field, iter->ent);
1086
1087 trace_seq_puts(s, "<user stack trace>\n");
1088 seq_print_userip_objs(field, s, flags);
1089
1090 return trace_handle_return(s);
1091 }
1092
1093 static struct trace_event_functions trace_user_stack_funcs = {
1094 .trace = trace_user_stack_print,
1095 };
1096
1097 static struct trace_event trace_user_stack_event = {
1098 .type = TRACE_USER_STACK,
1099 .funcs = &trace_user_stack_funcs,
1100 };
1101
1102 /* TRACE_BPUTS */
1103 static enum print_line_t
1104 trace_bputs_print(struct trace_iterator *iter, int flags,
1105 struct trace_event *event)
1106 {
1107 struct trace_entry *entry = iter->ent;
1108 struct trace_seq *s = &iter->seq;
1109 struct bputs_entry *field;
1110
1111 trace_assign_type(field, entry);
1112
1113 seq_print_ip_sym(s, field->ip, flags);
1114 trace_seq_puts(s, ": ");
1115 trace_seq_puts(s, field->str);
1116
1117 return trace_handle_return(s);
1118 }
1119
1120
1121 static enum print_line_t
1122 trace_bputs_raw(struct trace_iterator *iter, int flags,
1123 struct trace_event *event)
1124 {
1125 struct bputs_entry *field;
1126 struct trace_seq *s = &iter->seq;
1127
1128 trace_assign_type(field, iter->ent);
1129
1130 trace_seq_printf(s, ": %lx : ", field->ip);
1131 trace_seq_puts(s, field->str);
1132
1133 return trace_handle_return(s);
1134 }
1135
1136 static struct trace_event_functions trace_bputs_funcs = {
1137 .trace = trace_bputs_print,
1138 .raw = trace_bputs_raw,
1139 };
1140
1141 static struct trace_event trace_bputs_event = {
1142 .type = TRACE_BPUTS,
1143 .funcs = &trace_bputs_funcs,
1144 };
1145
1146 /* TRACE_BPRINT */
1147 static enum print_line_t
1148 trace_bprint_print(struct trace_iterator *iter, int flags,
1149 struct trace_event *event)
1150 {
1151 struct trace_entry *entry = iter->ent;
1152 struct trace_seq *s = &iter->seq;
1153 struct bprint_entry *field;
1154
1155 trace_assign_type(field, entry);
1156
1157 seq_print_ip_sym(s, field->ip, flags);
1158 trace_seq_puts(s, ": ");
1159 trace_seq_bprintf(s, field->fmt, field->buf);
1160
1161 return trace_handle_return(s);
1162 }
1163
1164
1165 static enum print_line_t
1166 trace_bprint_raw(struct trace_iterator *iter, int flags,
1167 struct trace_event *event)
1168 {
1169 struct bprint_entry *field;
1170 struct trace_seq *s = &iter->seq;
1171
1172 trace_assign_type(field, iter->ent);
1173
1174 trace_seq_printf(s, ": %lx : ", field->ip);
1175 trace_seq_bprintf(s, field->fmt, field->buf);
1176
1177 return trace_handle_return(s);
1178 }
1179
1180 static struct trace_event_functions trace_bprint_funcs = {
1181 .trace = trace_bprint_print,
1182 .raw = trace_bprint_raw,
1183 };
1184
1185 static struct trace_event trace_bprint_event = {
1186 .type = TRACE_BPRINT,
1187 .funcs = &trace_bprint_funcs,
1188 };
1189
1190 /* TRACE_PRINT */
1191 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1192 int flags, struct trace_event *event)
1193 {
1194 struct print_entry *field;
1195 struct trace_seq *s = &iter->seq;
1196
1197 trace_assign_type(field, iter->ent);
1198
1199 seq_print_ip_sym(s, field->ip, flags);
1200 trace_seq_printf(s, ": %s", field->buf);
1201
1202 return trace_handle_return(s);
1203 }
1204
1205 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1206 struct trace_event *event)
1207 {
1208 struct print_entry *field;
1209
1210 trace_assign_type(field, iter->ent);
1211
1212 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1213
1214 return trace_handle_return(&iter->seq);
1215 }
1216
1217 static struct trace_event_functions trace_print_funcs = {
1218 .trace = trace_print_print,
1219 .raw = trace_print_raw,
1220 };
1221
1222 static struct trace_event trace_print_event = {
1223 .type = TRACE_PRINT,
1224 .funcs = &trace_print_funcs,
1225 };
1226
1227
1228 static struct trace_event *events[] __initdata = {
1229 &trace_fn_event,
1230 &trace_ctx_event,
1231 &trace_wake_event,
1232 &trace_stack_event,
1233 &trace_user_stack_event,
1234 &trace_bputs_event,
1235 &trace_bprint_event,
1236 &trace_print_event,
1237 NULL
1238 };
1239
1240 __init static int init_events(void)
1241 {
1242 struct trace_event *event;
1243 int i, ret;
1244
1245 for (i = 0; events[i]; i++) {
1246 event = events[i];
1247
1248 ret = register_trace_event(event);
1249 if (!ret) {
1250 printk(KERN_WARNING "event %d failed to register\n",
1251 event->type);
1252 WARN_ON_ONCE(1);
1253 }
1254 }
1255
1256 return 0;
1257 }
1258 early_initcall(init_events);
Linux kernel - Deliverables
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