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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
23enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
24{
25 struct trace_seq *s = &iter->seq;
26 struct trace_entry *entry = iter->ent;
27 struct bputs_entry *field;
28
29 trace_assign_type(field, entry);
30
31 trace_seq_puts(s, field->str);
32
33 return trace_handle_return(s);
34}
35
36enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
37{
38 struct trace_seq *s = &iter->seq;
39 struct trace_entry *entry = iter->ent;
40 struct bprint_entry *field;
41
42 trace_assign_type(field, entry);
43
44 trace_seq_bprintf(s, field->fmt, field->buf);
45
46 return trace_handle_return(s);
47}
48
49enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
50{
51 struct trace_seq *s = &iter->seq;
52 struct trace_entry *entry = iter->ent;
53 struct print_entry *field;
54
55 trace_assign_type(field, entry);
56
57 trace_seq_puts(s, field->buf);
58
59 return trace_handle_return(s);
60}
61
62const char *
63trace_print_flags_seq(struct trace_seq *p, const char *delim,
64 unsigned long flags,
65 const struct trace_print_flags *flag_array)
66{
67 unsigned long mask;
68 const char *str;
69 const char *ret = trace_seq_buffer_ptr(p);
70 int i, first = 1;
71
72 for (i = 0; flag_array[i].name && flags; i++) {
73
74 mask = flag_array[i].mask;
75 if ((flags & mask) != mask)
76 continue;
77
78 str = flag_array[i].name;
79 flags &= ~mask;
80 if (!first && delim)
81 trace_seq_puts(p, delim);
82 else
83 first = 0;
84 trace_seq_puts(p, str);
85 }
86
87 /* check for left over flags */
88 if (flags) {
89 if (!first && delim)
90 trace_seq_puts(p, delim);
91 trace_seq_printf(p, "0x%lx", flags);
92 }
93
94 trace_seq_putc(p, 0);
95
96 return ret;
97}
98EXPORT_SYMBOL(trace_print_flags_seq);
99
100const char *
101trace_print_symbols_seq(struct trace_seq *p, unsigned long val,
102 const struct trace_print_flags *symbol_array)
103{
104 int i;
105 const char *ret = trace_seq_buffer_ptr(p);
106
107 for (i = 0; symbol_array[i].name; i++) {
108
109 if (val != symbol_array[i].mask)
110 continue;
111
112 trace_seq_puts(p, symbol_array[i].name);
113 break;
114 }
115
116 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
117 trace_seq_printf(p, "0x%lx", val);
118
119 trace_seq_putc(p, 0);
120
121 return ret;
122}
123EXPORT_SYMBOL(trace_print_symbols_seq);
124
125#if BITS_PER_LONG == 32
126const char *
127trace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
128 const struct trace_print_flags_u64 *symbol_array)
129{
130 int i;
131 const char *ret = trace_seq_buffer_ptr(p);
132
133 for (i = 0; symbol_array[i].name; i++) {
134
135 if (val != symbol_array[i].mask)
136 continue;
137
138 trace_seq_puts(p, symbol_array[i].name);
139 break;
140 }
141
142 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
143 trace_seq_printf(p, "0x%llx", val);
144
145 trace_seq_putc(p, 0);
146
147 return ret;
148}
149EXPORT_SYMBOL(trace_print_symbols_seq_u64);
150#endif
151
152const char *
153trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
154 unsigned int bitmask_size)
155{
156 const char *ret = trace_seq_buffer_ptr(p);
157
158 trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8);
159 trace_seq_putc(p, 0);
160
161 return ret;
162}
163EXPORT_SYMBOL_GPL(trace_print_bitmask_seq);
164
165const char *
166trace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
167{
168 int i;
169 const char *ret = trace_seq_buffer_ptr(p);
170
171 for (i = 0; i < buf_len; i++)
172 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
173
174 trace_seq_putc(p, 0);
175
176 return ret;
177}
178EXPORT_SYMBOL(trace_print_hex_seq);
179
180const char *
181trace_print_array_seq(struct trace_seq *p, const void *buf, int count,
182 size_t el_size)
183{
184 const char *ret = trace_seq_buffer_ptr(p);
185 const char *prefix = "";
186 void *ptr = (void *)buf;
187 size_t buf_len = count * el_size;
188
189 trace_seq_putc(p, '{');
190
191 while (ptr < buf + buf_len) {
192 switch (el_size) {
193 case 1:
194 trace_seq_printf(p, "%s0x%x", prefix,
195 *(u8 *)ptr);
196 break;
197 case 2:
198 trace_seq_printf(p, "%s0x%x", prefix,
199 *(u16 *)ptr);
200 break;
201 case 4:
202 trace_seq_printf(p, "%s0x%x", prefix,
203 *(u32 *)ptr);
204 break;
205 case 8:
206 trace_seq_printf(p, "%s0x%llx", prefix,
207 *(u64 *)ptr);
208 break;
209 default:
210 trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
211 *(u8 *)ptr);
212 el_size = 1;
213 }
214 prefix = ",";
215 ptr += el_size;
216 }
217
218 trace_seq_putc(p, '}');
219 trace_seq_putc(p, 0);
220
221 return ret;
222}
223EXPORT_SYMBOL(trace_print_array_seq);
224
225int trace_raw_output_prep(struct trace_iterator *iter,
226 struct trace_event *trace_event)
227{
228 struct trace_event_call *event;
229 struct trace_seq *s = &iter->seq;
230 struct trace_seq *p = &iter->tmp_seq;
231 struct trace_entry *entry;
232
233 event = container_of(trace_event, struct trace_event_call, event);
234 entry = iter->ent;
235
236 if (entry->type != event->event.type) {
237 WARN_ON_ONCE(1);
238 return TRACE_TYPE_UNHANDLED;
239 }
240
241 trace_seq_init(p);
242 trace_seq_printf(s, "%s: ", trace_event_name(event));
243
244 return trace_handle_return(s);
245}
246EXPORT_SYMBOL(trace_raw_output_prep);
247
248static int trace_output_raw(struct trace_iterator *iter, char *name,
249 char *fmt, va_list ap)
250{
251 struct trace_seq *s = &iter->seq;
252
253 trace_seq_printf(s, "%s: ", name);
254 trace_seq_vprintf(s, fmt, ap);
255
256 return trace_handle_return(s);
257}
258
259int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
260{
261 va_list ap;
262 int ret;
263
264 va_start(ap, fmt);
265 ret = trace_output_raw(iter, name, fmt, ap);
266 va_end(ap);
267
268 return ret;
269}
270EXPORT_SYMBOL_GPL(trace_output_call);
271
272#ifdef CONFIG_KRETPROBES
273static inline const char *kretprobed(const char *name)
274{
275 static const char tramp_name[] = "kretprobe_trampoline";
276 int size = sizeof(tramp_name);
277
278 if (strncmp(tramp_name, name, size) == 0)
279 return "[unknown/kretprobe'd]";
280 return name;
281}
282#else
283static inline const char *kretprobed(const char *name)
284{
285 return name;
286}
287#endif /* CONFIG_KRETPROBES */
288
289static void
290seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
291{
292#ifdef CONFIG_KALLSYMS
293 char str[KSYM_SYMBOL_LEN];
294 const char *name;
295
296 kallsyms_lookup(address, NULL, NULL, NULL, str);
297
298 name = kretprobed(str);
299
300 trace_seq_printf(s, fmt, name);
301#endif
302}
303
304static void
305seq_print_sym_offset(struct trace_seq *s, const char *fmt,
306 unsigned long address)
307{
308#ifdef CONFIG_KALLSYMS
309 char str[KSYM_SYMBOL_LEN];
310 const char *name;
311
312 sprint_symbol(str, address);
313 name = kretprobed(str);
314
315 trace_seq_printf(s, fmt, name);
316#endif
317}
318
319#ifndef CONFIG_64BIT
320# define IP_FMT "%08lx"
321#else
322# define IP_FMT "%016lx"
323#endif
324
325static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
326 unsigned long ip, unsigned long sym_flags)
327{
328 struct file *file = NULL;
329 unsigned long vmstart = 0;
330 int ret = 1;
331
332 if (s->full)
333 return 0;
334
335 if (mm) {
336 const struct vm_area_struct *vma;
337
338 down_read(&mm->mmap_sem);
339 vma = find_vma(mm, ip);
340 if (vma) {
341 file = vma->vm_file;
342 vmstart = vma->vm_start;
343 }
344 if (file) {
345 ret = trace_seq_path(s, &file->f_path);
346 if (ret)
347 trace_seq_printf(s, "[+0x%lx]",
348 ip - vmstart);
349 }
350 up_read(&mm->mmap_sem);
351 }
352 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
353 trace_seq_printf(s, " <" IP_FMT ">", ip);
354 return !trace_seq_has_overflowed(s);
355}
356
357int
358seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
359{
360 if (!ip) {
361 trace_seq_putc(s, '0');
362 goto out;
363 }
364
365 if (sym_flags & TRACE_ITER_SYM_OFFSET)
366 seq_print_sym_offset(s, "%s", ip);
367 else
368 seq_print_sym_short(s, "%s", ip);
369
370 if (sym_flags & TRACE_ITER_SYM_ADDR)
371 trace_seq_printf(s, " <" IP_FMT ">", ip);
372
373 out:
374 return !trace_seq_has_overflowed(s);
375}
376
377/**
378 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
379 * @s: trace seq struct to write to
380 * @entry: The trace entry field from the ring buffer
381 *
382 * Prints the generic fields of irqs off, in hard or softirq, preempt
383 * count.
384 */
385int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
386{
387 char hardsoft_irq;
388 char need_resched;
389 char irqs_off;
390 int hardirq;
391 int softirq;
392 int nmi;
393
394 nmi = entry->flags & TRACE_FLAG_NMI;
395 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
396 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
397
398 irqs_off =
399 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
400 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
401 '.';
402
403 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
404 TRACE_FLAG_PREEMPT_RESCHED)) {
405 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
406 need_resched = 'N';
407 break;
408 case TRACE_FLAG_NEED_RESCHED:
409 need_resched = 'n';
410 break;
411 case TRACE_FLAG_PREEMPT_RESCHED:
412 need_resched = 'p';
413 break;
414 default:
415 need_resched = '.';
416 break;
417 }
418
419 hardsoft_irq =
420 (nmi && hardirq) ? 'Z' :
421 nmi ? 'z' :
422 (hardirq && softirq) ? 'H' :
423 hardirq ? 'h' :
424 softirq ? 's' :
425 '.' ;
426
427 trace_seq_printf(s, "%c%c%c",
428 irqs_off, need_resched, hardsoft_irq);
429
430 if (entry->preempt_count)
431 trace_seq_printf(s, "%x", entry->preempt_count);
432 else
433 trace_seq_putc(s, '.');
434
435 return !trace_seq_has_overflowed(s);
436}
437
438static int
439lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
440{
441 char comm[TASK_COMM_LEN];
442
443 trace_find_cmdline(entry->pid, comm);
444
445 trace_seq_printf(s, "%8.8s-%-5d %3d",
446 comm, entry->pid, cpu);
447
448 return trace_print_lat_fmt(s, entry);
449}
450
451#undef MARK
452#define MARK(v, s) {.val = v, .sym = s}
453/* trace overhead mark */
454static const struct trace_mark {
455 unsigned long long val; /* unit: nsec */
456 char sym;
457} mark[] = {
458 MARK(1000000000ULL , '$'), /* 1 sec */
459 MARK(100000000ULL , '@'), /* 100 msec */
460 MARK(10000000ULL , '*'), /* 10 msec */
461 MARK(1000000ULL , '#'), /* 1000 usecs */
462 MARK(100000ULL , '!'), /* 100 usecs */
463 MARK(10000ULL , '+'), /* 10 usecs */
464};
465#undef MARK
466
467char trace_find_mark(unsigned long long d)
468{
469 int i;
470 int size = ARRAY_SIZE(mark);
471
472 for (i = 0; i < size; i++) {
473 if (d > mark[i].val)
474 break;
475 }
476
477 return (i == size) ? ' ' : mark[i].sym;
478}
479
480static int
481lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
482{
483 struct trace_array *tr = iter->tr;
484 unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
485 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
486 unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start;
487 unsigned long long rel_ts = next_ts - iter->ts;
488 struct trace_seq *s = &iter->seq;
489
490 if (in_ns) {
491 abs_ts = ns2usecs(abs_ts);
492 rel_ts = ns2usecs(rel_ts);
493 }
494
495 if (verbose && in_ns) {
496 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
497 unsigned long abs_msec = (unsigned long)abs_ts;
498 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
499 unsigned long rel_msec = (unsigned long)rel_ts;
500
501 trace_seq_printf(
502 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
503 ns2usecs(iter->ts),
504 abs_msec, abs_usec,
505 rel_msec, rel_usec);
506
507 } else if (verbose && !in_ns) {
508 trace_seq_printf(
509 s, "[%016llx] %lld (+%lld): ",
510 iter->ts, abs_ts, rel_ts);
511
512 } else if (!verbose && in_ns) {
513 trace_seq_printf(
514 s, " %4lldus%c: ",
515 abs_ts,
516 trace_find_mark(rel_ts * NSEC_PER_USEC));
517
518 } else { /* !verbose && !in_ns */
519 trace_seq_printf(s, " %4lld: ", abs_ts);
520 }
521
522 return !trace_seq_has_overflowed(s);
523}
524
525int trace_print_context(struct trace_iterator *iter)
526{
527 struct trace_array *tr = iter->tr;
528 struct trace_seq *s = &iter->seq;
529 struct trace_entry *entry = iter->ent;
530 unsigned long long t;
531 unsigned long secs, usec_rem;
532 char comm[TASK_COMM_LEN];
533
534 trace_find_cmdline(entry->pid, comm);
535
536 trace_seq_printf(s, "%16s-%-5d [%03d] ",
537 comm, entry->pid, iter->cpu);
538
539 if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
540 trace_print_lat_fmt(s, entry);
541
542 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
543 t = ns2usecs(iter->ts);
544 usec_rem = do_div(t, USEC_PER_SEC);
545 secs = (unsigned long)t;
546 trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
547 } else
548 trace_seq_printf(s, " %12llu: ", iter->ts);
549
550 return !trace_seq_has_overflowed(s);
551}
552
553int trace_print_lat_context(struct trace_iterator *iter)
554{
555 struct trace_array *tr = iter->tr;
556 /* trace_find_next_entry will reset ent_size */
557 int ent_size = iter->ent_size;
558 struct trace_seq *s = &iter->seq;
559 u64 next_ts;
560 struct trace_entry *entry = iter->ent,
561 *next_entry = trace_find_next_entry(iter, NULL,
562 &next_ts);
563 unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
564
565 /* Restore the original ent_size */
566 iter->ent_size = ent_size;
567
568 if (!next_entry)
569 next_ts = iter->ts;
570
571 if (verbose) {
572 char comm[TASK_COMM_LEN];
573
574 trace_find_cmdline(entry->pid, comm);
575
576 trace_seq_printf(
577 s, "%16s %5d %3d %d %08x %08lx ",
578 comm, entry->pid, iter->cpu, entry->flags,
579 entry->preempt_count, iter->idx);
580 } else {
581 lat_print_generic(s, entry, iter->cpu);
582 }
583
584 lat_print_timestamp(iter, next_ts);
585
586 return !trace_seq_has_overflowed(s);
587}
588
589static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
590
591static int task_state_char(unsigned long state)
592{
593 int bit = state ? __ffs(state) + 1 : 0;
594
595 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
596}
597
598/**
599 * ftrace_find_event - find a registered event
600 * @type: the type of event to look for
601 *
602 * Returns an event of type @type otherwise NULL
603 * Called with trace_event_read_lock() held.
604 */
605struct trace_event *ftrace_find_event(int type)
606{
607 struct trace_event *event;
608 unsigned key;
609
610 key = type & (EVENT_HASHSIZE - 1);
611
612 hlist_for_each_entry(event, &event_hash[key], node) {
613 if (event->type == type)
614 return event;
615 }
616
617 return NULL;
618}
619
620static LIST_HEAD(ftrace_event_list);
621
622static int trace_search_list(struct list_head **list)
623{
624 struct trace_event *e;
625 int last = __TRACE_LAST_TYPE;
626
627 if (list_empty(&ftrace_event_list)) {
628 *list = &ftrace_event_list;
629 return last + 1;
630 }
631
632 /*
633 * We used up all possible max events,
634 * lets see if somebody freed one.
635 */
636 list_for_each_entry(e, &ftrace_event_list, list) {
637 if (e->type != last + 1)
638 break;
639 last++;
640 }
641
642 /* Did we used up all 65 thousand events??? */
643 if ((last + 1) > TRACE_EVENT_TYPE_MAX)
644 return 0;
645
646 *list = &e->list;
647 return last + 1;
648}
649
650void trace_event_read_lock(void)
651{
652 down_read(&trace_event_sem);
653}
654
655void trace_event_read_unlock(void)
656{
657 up_read(&trace_event_sem);
658}
659
660/**
661 * register_trace_event - register output for an event type
662 * @event: the event type to register
663 *
664 * Event types are stored in a hash and this hash is used to
665 * find a way to print an event. If the @event->type is set
666 * then it will use that type, otherwise it will assign a
667 * type to use.
668 *
669 * If you assign your own type, please make sure it is added
670 * to the trace_type enum in trace.h, to avoid collisions
671 * with the dynamic types.
672 *
673 * Returns the event type number or zero on error.
674 */
675int register_trace_event(struct trace_event *event)
676{
677 unsigned key;
678 int ret = 0;
679
680 down_write(&trace_event_sem);
681
682 if (WARN_ON(!event))
683 goto out;
684
685 if (WARN_ON(!event->funcs))
686 goto out;
687
688 INIT_LIST_HEAD(&event->list);
689
690 if (!event->type) {
691 struct list_head *list = NULL;
692
693 if (next_event_type > TRACE_EVENT_TYPE_MAX) {
694
695 event->type = trace_search_list(&list);
696 if (!event->type)
697 goto out;
698
699 } else {
700
701 event->type = next_event_type++;
702 list = &ftrace_event_list;
703 }
704
705 if (WARN_ON(ftrace_find_event(event->type)))
706 goto out;
707
708 list_add_tail(&event->list, list);
709
710 } else if (event->type > __TRACE_LAST_TYPE) {
711 printk(KERN_WARNING "Need to add type to trace.h\n");
712 WARN_ON(1);
713 goto out;
714 } else {
715 /* Is this event already used */
716 if (ftrace_find_event(event->type))
717 goto out;
718 }
719
720 if (event->funcs->trace == NULL)
721 event->funcs->trace = trace_nop_print;
722 if (event->funcs->raw == NULL)
723 event->funcs->raw = trace_nop_print;
724 if (event->funcs->hex == NULL)
725 event->funcs->hex = trace_nop_print;
726 if (event->funcs->binary == NULL)
727 event->funcs->binary = trace_nop_print;
728
729 key = event->type & (EVENT_HASHSIZE - 1);
730
731 hlist_add_head(&event->node, &event_hash[key]);
732
733 ret = event->type;
734 out:
735 up_write(&trace_event_sem);
736
737 return ret;
738}
739EXPORT_SYMBOL_GPL(register_trace_event);
740
741/*
742 * Used by module code with the trace_event_sem held for write.
743 */
744int __unregister_trace_event(struct trace_event *event)
745{
746 hlist_del(&event->node);
747 list_del(&event->list);
748 return 0;
749}
750
751/**
752 * unregister_trace_event - remove a no longer used event
753 * @event: the event to remove
754 */
755int unregister_trace_event(struct trace_event *event)
756{
757 down_write(&trace_event_sem);
758 __unregister_trace_event(event);
759 up_write(&trace_event_sem);
760
761 return 0;
762}
763EXPORT_SYMBOL_GPL(unregister_trace_event);
764
765/*
766 * Standard events
767 */
768
769enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
770 struct trace_event *event)
771{
772 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
773
774 return trace_handle_return(&iter->seq);
775}
776
777/* TRACE_FN */
778static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
779 struct trace_event *event)
780{
781 struct ftrace_entry *field;
782 struct trace_seq *s = &iter->seq;
783
784 trace_assign_type(field, iter->ent);
785
786 seq_print_ip_sym(s, field->ip, flags);
787
788 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
789 trace_seq_puts(s, " <-");
790 seq_print_ip_sym(s, field->parent_ip, flags);
791 }
792
793 trace_seq_putc(s, '\n');
794
795 return trace_handle_return(s);
796}
797
798static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
799 struct trace_event *event)
800{
801 struct ftrace_entry *field;
802
803 trace_assign_type(field, iter->ent);
804
805 trace_seq_printf(&iter->seq, "%lx %lx\n",
806 field->ip,
807 field->parent_ip);
808
809 return trace_handle_return(&iter->seq);
810}
811
812static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
813 struct trace_event *event)
814{
815 struct ftrace_entry *field;
816 struct trace_seq *s = &iter->seq;
817
818 trace_assign_type(field, iter->ent);
819
820 SEQ_PUT_HEX_FIELD(s, field->ip);
821 SEQ_PUT_HEX_FIELD(s, field->parent_ip);
822
823 return trace_handle_return(s);
824}
825
826static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
827 struct trace_event *event)
828{
829 struct ftrace_entry *field;
830 struct trace_seq *s = &iter->seq;
831
832 trace_assign_type(field, iter->ent);
833
834 SEQ_PUT_FIELD(s, field->ip);
835 SEQ_PUT_FIELD(s, field->parent_ip);
836
837 return trace_handle_return(s);
838}
839
840static struct trace_event_functions trace_fn_funcs = {
841 .trace = trace_fn_trace,
842 .raw = trace_fn_raw,
843 .hex = trace_fn_hex,
844 .binary = trace_fn_bin,
845};
846
847static struct trace_event trace_fn_event = {
848 .type = TRACE_FN,
849 .funcs = &trace_fn_funcs,
850};
851
852/* TRACE_CTX an TRACE_WAKE */
853static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
854 char *delim)
855{
856 struct ctx_switch_entry *field;
857 char comm[TASK_COMM_LEN];
858 int S, T;
859
860
861 trace_assign_type(field, iter->ent);
862
863 T = task_state_char(field->next_state);
864 S = task_state_char(field->prev_state);
865 trace_find_cmdline(field->next_pid, comm);
866 trace_seq_printf(&iter->seq,
867 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
868 field->prev_pid,
869 field->prev_prio,
870 S, delim,
871 field->next_cpu,
872 field->next_pid,
873 field->next_prio,
874 T, comm);
875
876 return trace_handle_return(&iter->seq);
877}
878
879static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
880 struct trace_event *event)
881{
882 return trace_ctxwake_print(iter, "==>");
883}
884
885static enum print_line_t trace_wake_print(struct trace_iterator *iter,
886 int flags, struct trace_event *event)
887{
888 return trace_ctxwake_print(iter, " +");
889}
890
891static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
892{
893 struct ctx_switch_entry *field;
894 int T;
895
896 trace_assign_type(field, iter->ent);
897
898 if (!S)
899 S = task_state_char(field->prev_state);
900 T = task_state_char(field->next_state);
901 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
902 field->prev_pid,
903 field->prev_prio,
904 S,
905 field->next_cpu,
906 field->next_pid,
907 field->next_prio,
908 T);
909
910 return trace_handle_return(&iter->seq);
911}
912
913static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
914 struct trace_event *event)
915{
916 return trace_ctxwake_raw(iter, 0);
917}
918
919static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
920 struct trace_event *event)
921{
922 return trace_ctxwake_raw(iter, '+');
923}
924
925
926static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
927{
928 struct ctx_switch_entry *field;
929 struct trace_seq *s = &iter->seq;
930 int T;
931
932 trace_assign_type(field, iter->ent);
933
934 if (!S)
935 S = task_state_char(field->prev_state);
936 T = task_state_char(field->next_state);
937
938 SEQ_PUT_HEX_FIELD(s, field->prev_pid);
939 SEQ_PUT_HEX_FIELD(s, field->prev_prio);
940 SEQ_PUT_HEX_FIELD(s, S);
941 SEQ_PUT_HEX_FIELD(s, field->next_cpu);
942 SEQ_PUT_HEX_FIELD(s, field->next_pid);
943 SEQ_PUT_HEX_FIELD(s, field->next_prio);
944 SEQ_PUT_HEX_FIELD(s, T);
945
946 return trace_handle_return(s);
947}
948
949static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
950 struct trace_event *event)
951{
952 return trace_ctxwake_hex(iter, 0);
953}
954
955static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
956 struct trace_event *event)
957{
958 return trace_ctxwake_hex(iter, '+');
959}
960
961static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
962 int flags, struct trace_event *event)
963{
964 struct ctx_switch_entry *field;
965 struct trace_seq *s = &iter->seq;
966
967 trace_assign_type(field, iter->ent);
968
969 SEQ_PUT_FIELD(s, field->prev_pid);
970 SEQ_PUT_FIELD(s, field->prev_prio);
971 SEQ_PUT_FIELD(s, field->prev_state);
972 SEQ_PUT_FIELD(s, field->next_cpu);
973 SEQ_PUT_FIELD(s, field->next_pid);
974 SEQ_PUT_FIELD(s, field->next_prio);
975 SEQ_PUT_FIELD(s, field->next_state);
976
977 return trace_handle_return(s);
978}
979
980static struct trace_event_functions trace_ctx_funcs = {
981 .trace = trace_ctx_print,
982 .raw = trace_ctx_raw,
983 .hex = trace_ctx_hex,
984 .binary = trace_ctxwake_bin,
985};
986
987static struct trace_event trace_ctx_event = {
988 .type = TRACE_CTX,
989 .funcs = &trace_ctx_funcs,
990};
991
992static struct trace_event_functions trace_wake_funcs = {
993 .trace = trace_wake_print,
994 .raw = trace_wake_raw,
995 .hex = trace_wake_hex,
996 .binary = trace_ctxwake_bin,
997};
998
999static struct trace_event trace_wake_event = {
1000 .type = TRACE_WAKE,
1001 .funcs = &trace_wake_funcs,
1002};
1003
1004/* TRACE_STACK */
1005
1006static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1007 int flags, struct trace_event *event)
1008{
1009 struct stack_entry *field;
1010 struct trace_seq *s = &iter->seq;
1011 unsigned long *p;
1012 unsigned long *end;
1013
1014 trace_assign_type(field, iter->ent);
1015 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1016
1017 trace_seq_puts(s, "<stack trace>\n");
1018
1019 for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1020
1021 if (trace_seq_has_overflowed(s))
1022 break;
1023
1024 trace_seq_puts(s, " => ");
1025 seq_print_ip_sym(s, *p, flags);
1026 trace_seq_putc(s, '\n');
1027 }
1028
1029 return trace_handle_return(s);
1030}
1031
1032static struct trace_event_functions trace_stack_funcs = {
1033 .trace = trace_stack_print,
1034};
1035
1036static struct trace_event trace_stack_event = {
1037 .type = TRACE_STACK,
1038 .funcs = &trace_stack_funcs,
1039};
1040
1041/* TRACE_USER_STACK */
1042static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1043 int flags, struct trace_event *event)
1044{
1045 struct trace_array *tr = iter->tr;
1046 struct userstack_entry *field;
1047 struct trace_seq *s = &iter->seq;
1048 struct mm_struct *mm = NULL;
1049 unsigned int i;
1050
1051 trace_assign_type(field, iter->ent);
1052
1053 trace_seq_puts(s, "<user stack trace>\n");
1054
1055 if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
1056 struct task_struct *task;
1057 /*
1058 * we do the lookup on the thread group leader,
1059 * since individual threads might have already quit!
1060 */
1061 rcu_read_lock();
1062 task = find_task_by_vpid(field->tgid);
1063 if (task)
1064 mm = get_task_mm(task);
1065 rcu_read_unlock();
1066 }
1067
1068 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1069 unsigned long ip = field->caller[i];
1070
1071 if (ip == ULONG_MAX || trace_seq_has_overflowed(s))
1072 break;
1073
1074 trace_seq_puts(s, " => ");
1075
1076 if (!ip) {
1077 trace_seq_puts(s, "??");
1078 trace_seq_putc(s, '\n');
1079 continue;
1080 }
1081
1082 seq_print_user_ip(s, mm, ip, flags);
1083 trace_seq_putc(s, '\n');
1084 }
1085
1086 if (mm)
1087 mmput(mm);
1088
1089 return trace_handle_return(s);
1090}
1091
1092static struct trace_event_functions trace_user_stack_funcs = {
1093 .trace = trace_user_stack_print,
1094};
1095
1096static struct trace_event trace_user_stack_event = {
1097 .type = TRACE_USER_STACK,
1098 .funcs = &trace_user_stack_funcs,
1099};
1100
1101/* TRACE_BPUTS */
1102static enum print_line_t
1103trace_bputs_print(struct trace_iterator *iter, int flags,
1104 struct trace_event *event)
1105{
1106 struct trace_entry *entry = iter->ent;
1107 struct trace_seq *s = &iter->seq;
1108 struct bputs_entry *field;
1109
1110 trace_assign_type(field, entry);
1111
1112 seq_print_ip_sym(s, field->ip, flags);
1113 trace_seq_puts(s, ": ");
1114 trace_seq_puts(s, field->str);
1115
1116 return trace_handle_return(s);
1117}
1118
1119
1120static enum print_line_t
1121trace_bputs_raw(struct trace_iterator *iter, int flags,
1122 struct trace_event *event)
1123{
1124 struct bputs_entry *field;
1125 struct trace_seq *s = &iter->seq;
1126
1127 trace_assign_type(field, iter->ent);
1128
1129 trace_seq_printf(s, ": %lx : ", field->ip);
1130 trace_seq_puts(s, field->str);
1131
1132 return trace_handle_return(s);
1133}
1134
1135static struct trace_event_functions trace_bputs_funcs = {
1136 .trace = trace_bputs_print,
1137 .raw = trace_bputs_raw,
1138};
1139
1140static struct trace_event trace_bputs_event = {
1141 .type = TRACE_BPUTS,
1142 .funcs = &trace_bputs_funcs,
1143};
1144
1145/* TRACE_BPRINT */
1146static enum print_line_t
1147trace_bprint_print(struct trace_iterator *iter, int flags,
1148 struct trace_event *event)
1149{
1150 struct trace_entry *entry = iter->ent;
1151 struct trace_seq *s = &iter->seq;
1152 struct bprint_entry *field;
1153
1154 trace_assign_type(field, entry);
1155
1156 seq_print_ip_sym(s, field->ip, flags);
1157 trace_seq_puts(s, ": ");
1158 trace_seq_bprintf(s, field->fmt, field->buf);
1159
1160 return trace_handle_return(s);
1161}
1162
1163
1164static enum print_line_t
1165trace_bprint_raw(struct trace_iterator *iter, int flags,
1166 struct trace_event *event)
1167{
1168 struct bprint_entry *field;
1169 struct trace_seq *s = &iter->seq;
1170
1171 trace_assign_type(field, iter->ent);
1172
1173 trace_seq_printf(s, ": %lx : ", field->ip);
1174 trace_seq_bprintf(s, field->fmt, field->buf);
1175
1176 return trace_handle_return(s);
1177}
1178
1179static struct trace_event_functions trace_bprint_funcs = {
1180 .trace = trace_bprint_print,
1181 .raw = trace_bprint_raw,
1182};
1183
1184static struct trace_event trace_bprint_event = {
1185 .type = TRACE_BPRINT,
1186 .funcs = &trace_bprint_funcs,
1187};
1188
1189/* TRACE_PRINT */
1190static enum print_line_t trace_print_print(struct trace_iterator *iter,
1191 int flags, struct trace_event *event)
1192{
1193 struct print_entry *field;
1194 struct trace_seq *s = &iter->seq;
1195
1196 trace_assign_type(field, iter->ent);
1197
1198 seq_print_ip_sym(s, field->ip, flags);
1199 trace_seq_printf(s, ": %s", field->buf);
1200
1201 return trace_handle_return(s);
1202}
1203
1204static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1205 struct trace_event *event)
1206{
1207 struct print_entry *field;
1208
1209 trace_assign_type(field, iter->ent);
1210
1211 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1212
1213 return trace_handle_return(&iter->seq);
1214}
1215
1216static struct trace_event_functions trace_print_funcs = {
1217 .trace = trace_print_print,
1218 .raw = trace_print_raw,
1219};
1220
1221static struct trace_event trace_print_event = {
1222 .type = TRACE_PRINT,
1223 .funcs = &trace_print_funcs,
1224};
1225
1226
1227static struct trace_event *events[] __initdata = {
1228 &trace_fn_event,
1229 &trace_ctx_event,
1230 &trace_wake_event,
1231 &trace_stack_event,
1232 &trace_user_stack_event,
1233 &trace_bputs_event,
1234 &trace_bprint_event,
1235 &trace_print_event,
1236 NULL
1237};
1238
1239__init static int init_events(void)
1240{
1241 struct trace_event *event;
1242 int i, ret;
1243
1244 for (i = 0; events[i]; i++) {
1245 event = events[i];
1246
1247 ret = register_trace_event(event);
1248 if (!ret) {
1249 printk(KERN_WARNING "event %d failed to register\n",
1250 event->type);
1251 WARN_ON_ONCE(1);
1252 }
1253 }
1254
1255 return 0;
1256}
1257early_initcall(init_events);
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * trace_output.c
4 *
5 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
6 *
7 */
8#include <linux/module.h>
9#include <linux/mutex.h>
10#include <linux/ftrace.h>
11#include <linux/sched/clock.h>
12#include <linux/sched/mm.h>
13
14#include "trace_output.h"
15
16/* must be a power of 2 */
17#define EVENT_HASHSIZE 128
18
19DECLARE_RWSEM(trace_event_sem);
20
21static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
22
23static int next_event_type = __TRACE_LAST_TYPE;
24
25enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
26{
27 struct trace_seq *s = &iter->seq;
28 struct trace_entry *entry = iter->ent;
29 struct bputs_entry *field;
30
31 trace_assign_type(field, entry);
32
33 trace_seq_puts(s, field->str);
34
35 return trace_handle_return(s);
36}
37
38enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
39{
40 struct trace_seq *s = &iter->seq;
41 struct trace_entry *entry = iter->ent;
42 struct bprint_entry *field;
43
44 trace_assign_type(field, entry);
45
46 trace_seq_bprintf(s, field->fmt, field->buf);
47
48 return trace_handle_return(s);
49}
50
51enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
52{
53 struct trace_seq *s = &iter->seq;
54 struct trace_entry *entry = iter->ent;
55 struct print_entry *field;
56
57 trace_assign_type(field, entry);
58
59 trace_seq_puts(s, field->buf);
60
61 return trace_handle_return(s);
62}
63
64const char *
65trace_print_flags_seq(struct trace_seq *p, const char *delim,
66 unsigned long flags,
67 const struct trace_print_flags *flag_array)
68{
69 unsigned long mask;
70 const char *str;
71 const char *ret = trace_seq_buffer_ptr(p);
72 int i, first = 1;
73
74 for (i = 0; flag_array[i].name && flags; i++) {
75
76 mask = flag_array[i].mask;
77 if ((flags & mask) != mask)
78 continue;
79
80 str = flag_array[i].name;
81 flags &= ~mask;
82 if (!first && delim)
83 trace_seq_puts(p, delim);
84 else
85 first = 0;
86 trace_seq_puts(p, str);
87 }
88
89 /* check for left over flags */
90 if (flags) {
91 if (!first && delim)
92 trace_seq_puts(p, delim);
93 trace_seq_printf(p, "0x%lx", flags);
94 }
95
96 trace_seq_putc(p, 0);
97
98 return ret;
99}
100EXPORT_SYMBOL(trace_print_flags_seq);
101
102const char *
103trace_print_symbols_seq(struct trace_seq *p, unsigned long val,
104 const struct trace_print_flags *symbol_array)
105{
106 int i;
107 const char *ret = trace_seq_buffer_ptr(p);
108
109 for (i = 0; symbol_array[i].name; i++) {
110
111 if (val != symbol_array[i].mask)
112 continue;
113
114 trace_seq_puts(p, symbol_array[i].name);
115 break;
116 }
117
118 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
119 trace_seq_printf(p, "0x%lx", val);
120
121 trace_seq_putc(p, 0);
122
123 return ret;
124}
125EXPORT_SYMBOL(trace_print_symbols_seq);
126
127#if BITS_PER_LONG == 32
128const char *
129trace_print_flags_seq_u64(struct trace_seq *p, const char *delim,
130 unsigned long long flags,
131 const struct trace_print_flags_u64 *flag_array)
132{
133 unsigned long long mask;
134 const char *str;
135 const char *ret = trace_seq_buffer_ptr(p);
136 int i, first = 1;
137
138 for (i = 0; flag_array[i].name && flags; i++) {
139
140 mask = flag_array[i].mask;
141 if ((flags & mask) != mask)
142 continue;
143
144 str = flag_array[i].name;
145 flags &= ~mask;
146 if (!first && delim)
147 trace_seq_puts(p, delim);
148 else
149 first = 0;
150 trace_seq_puts(p, str);
151 }
152
153 /* check for left over flags */
154 if (flags) {
155 if (!first && delim)
156 trace_seq_puts(p, delim);
157 trace_seq_printf(p, "0x%llx", flags);
158 }
159
160 trace_seq_putc(p, 0);
161
162 return ret;
163}
164EXPORT_SYMBOL(trace_print_flags_seq_u64);
165
166const char *
167trace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
168 const struct trace_print_flags_u64 *symbol_array)
169{
170 int i;
171 const char *ret = trace_seq_buffer_ptr(p);
172
173 for (i = 0; symbol_array[i].name; i++) {
174
175 if (val != symbol_array[i].mask)
176 continue;
177
178 trace_seq_puts(p, symbol_array[i].name);
179 break;
180 }
181
182 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
183 trace_seq_printf(p, "0x%llx", val);
184
185 trace_seq_putc(p, 0);
186
187 return ret;
188}
189EXPORT_SYMBOL(trace_print_symbols_seq_u64);
190#endif
191
192const char *
193trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
194 unsigned int bitmask_size)
195{
196 const char *ret = trace_seq_buffer_ptr(p);
197
198 trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8);
199 trace_seq_putc(p, 0);
200
201 return ret;
202}
203EXPORT_SYMBOL_GPL(trace_print_bitmask_seq);
204
205/**
206 * trace_print_hex_seq - print buffer as hex sequence
207 * @p: trace seq struct to write to
208 * @buf: The buffer to print
209 * @buf_len: Length of @buf in bytes
210 * @concatenate: Print @buf as single hex string or with spacing
211 *
212 * Prints the passed buffer as a hex sequence either as a whole,
213 * single hex string if @concatenate is true or with spacing after
214 * each byte in case @concatenate is false.
215 */
216const char *
217trace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len,
218 bool concatenate)
219{
220 int i;
221 const char *ret = trace_seq_buffer_ptr(p);
222 const char *fmt = concatenate ? "%*phN" : "%*ph";
223
224 for (i = 0; i < buf_len; i += 16)
225 trace_seq_printf(p, fmt, min(buf_len - i, 16), &buf[i]);
226 trace_seq_putc(p, 0);
227
228 return ret;
229}
230EXPORT_SYMBOL(trace_print_hex_seq);
231
232const char *
233trace_print_array_seq(struct trace_seq *p, const void *buf, int count,
234 size_t el_size)
235{
236 const char *ret = trace_seq_buffer_ptr(p);
237 const char *prefix = "";
238 void *ptr = (void *)buf;
239 size_t buf_len = count * el_size;
240
241 trace_seq_putc(p, '{');
242
243 while (ptr < buf + buf_len) {
244 switch (el_size) {
245 case 1:
246 trace_seq_printf(p, "%s0x%x", prefix,
247 *(u8 *)ptr);
248 break;
249 case 2:
250 trace_seq_printf(p, "%s0x%x", prefix,
251 *(u16 *)ptr);
252 break;
253 case 4:
254 trace_seq_printf(p, "%s0x%x", prefix,
255 *(u32 *)ptr);
256 break;
257 case 8:
258 trace_seq_printf(p, "%s0x%llx", prefix,
259 *(u64 *)ptr);
260 break;
261 default:
262 trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
263 *(u8 *)ptr);
264 el_size = 1;
265 }
266 prefix = ",";
267 ptr += el_size;
268 }
269
270 trace_seq_putc(p, '}');
271 trace_seq_putc(p, 0);
272
273 return ret;
274}
275EXPORT_SYMBOL(trace_print_array_seq);
276
277const char *
278trace_print_hex_dump_seq(struct trace_seq *p, const char *prefix_str,
279 int prefix_type, int rowsize, int groupsize,
280 const void *buf, size_t len, bool ascii)
281{
282 const char *ret = trace_seq_buffer_ptr(p);
283
284 trace_seq_putc(p, '\n');
285 trace_seq_hex_dump(p, prefix_str, prefix_type,
286 rowsize, groupsize, buf, len, ascii);
287 trace_seq_putc(p, 0);
288 return ret;
289}
290EXPORT_SYMBOL(trace_print_hex_dump_seq);
291
292int trace_raw_output_prep(struct trace_iterator *iter,
293 struct trace_event *trace_event)
294{
295 struct trace_event_call *event;
296 struct trace_seq *s = &iter->seq;
297 struct trace_seq *p = &iter->tmp_seq;
298 struct trace_entry *entry;
299
300 event = container_of(trace_event, struct trace_event_call, event);
301 entry = iter->ent;
302
303 if (entry->type != event->event.type) {
304 WARN_ON_ONCE(1);
305 return TRACE_TYPE_UNHANDLED;
306 }
307
308 trace_seq_init(p);
309 trace_seq_printf(s, "%s: ", trace_event_name(event));
310
311 return trace_handle_return(s);
312}
313EXPORT_SYMBOL(trace_raw_output_prep);
314
315static int trace_output_raw(struct trace_iterator *iter, char *name,
316 char *fmt, va_list ap)
317{
318 struct trace_seq *s = &iter->seq;
319
320 trace_seq_printf(s, "%s: ", name);
321 trace_seq_vprintf(s, fmt, ap);
322
323 return trace_handle_return(s);
324}
325
326int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
327{
328 va_list ap;
329 int ret;
330
331 va_start(ap, fmt);
332 ret = trace_output_raw(iter, name, fmt, ap);
333 va_end(ap);
334
335 return ret;
336}
337EXPORT_SYMBOL_GPL(trace_output_call);
338
339#ifdef CONFIG_KRETPROBES
340static inline const char *kretprobed(const char *name)
341{
342 static const char tramp_name[] = "kretprobe_trampoline";
343 int size = sizeof(tramp_name);
344
345 if (strncmp(tramp_name, name, size) == 0)
346 return "[unknown/kretprobe'd]";
347 return name;
348}
349#else
350static inline const char *kretprobed(const char *name)
351{
352 return name;
353}
354#endif /* CONFIG_KRETPROBES */
355
356static void
357seq_print_sym(struct trace_seq *s, unsigned long address, bool offset)
358{
359#ifdef CONFIG_KALLSYMS
360 char str[KSYM_SYMBOL_LEN];
361 const char *name;
362
363 if (offset)
364 sprint_symbol(str, address);
365 else
366 kallsyms_lookup(address, NULL, NULL, NULL, str);
367 name = kretprobed(str);
368
369 if (name && strlen(name)) {
370 trace_seq_puts(s, name);
371 return;
372 }
373#endif
374 trace_seq_printf(s, "0x%08lx", address);
375}
376
377#ifndef CONFIG_64BIT
378# define IP_FMT "%08lx"
379#else
380# define IP_FMT "%016lx"
381#endif
382
383static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
384 unsigned long ip, unsigned long sym_flags)
385{
386 struct file *file = NULL;
387 unsigned long vmstart = 0;
388 int ret = 1;
389
390 if (s->full)
391 return 0;
392
393 if (mm) {
394 const struct vm_area_struct *vma;
395
396 mmap_read_lock(mm);
397 vma = find_vma(mm, ip);
398 if (vma) {
399 file = vma->vm_file;
400 vmstart = vma->vm_start;
401 }
402 if (file) {
403 ret = trace_seq_path(s, &file->f_path);
404 if (ret)
405 trace_seq_printf(s, "[+0x%lx]",
406 ip - vmstart);
407 }
408 mmap_read_unlock(mm);
409 }
410 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
411 trace_seq_printf(s, " <" IP_FMT ">", ip);
412 return !trace_seq_has_overflowed(s);
413}
414
415int
416seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
417{
418 if (!ip) {
419 trace_seq_putc(s, '0');
420 goto out;
421 }
422
423 seq_print_sym(s, ip, sym_flags & TRACE_ITER_SYM_OFFSET);
424
425 if (sym_flags & TRACE_ITER_SYM_ADDR)
426 trace_seq_printf(s, " <" IP_FMT ">", ip);
427
428 out:
429 return !trace_seq_has_overflowed(s);
430}
431
432/**
433 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
434 * @s: trace seq struct to write to
435 * @entry: The trace entry field from the ring buffer
436 *
437 * Prints the generic fields of irqs off, in hard or softirq, preempt
438 * count.
439 */
440int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
441{
442 char hardsoft_irq;
443 char need_resched;
444 char irqs_off;
445 int hardirq;
446 int softirq;
447 int nmi;
448
449 nmi = entry->flags & TRACE_FLAG_NMI;
450 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
451 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
452
453 irqs_off =
454 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
455 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
456 '.';
457
458 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
459 TRACE_FLAG_PREEMPT_RESCHED)) {
460 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
461 need_resched = 'N';
462 break;
463 case TRACE_FLAG_NEED_RESCHED:
464 need_resched = 'n';
465 break;
466 case TRACE_FLAG_PREEMPT_RESCHED:
467 need_resched = 'p';
468 break;
469 default:
470 need_resched = '.';
471 break;
472 }
473
474 hardsoft_irq =
475 (nmi && hardirq) ? 'Z' :
476 nmi ? 'z' :
477 (hardirq && softirq) ? 'H' :
478 hardirq ? 'h' :
479 softirq ? 's' :
480 '.' ;
481
482 trace_seq_printf(s, "%c%c%c",
483 irqs_off, need_resched, hardsoft_irq);
484
485 if (entry->preempt_count)
486 trace_seq_printf(s, "%x", entry->preempt_count);
487 else
488 trace_seq_putc(s, '.');
489
490 return !trace_seq_has_overflowed(s);
491}
492
493static int
494lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
495{
496 char comm[TASK_COMM_LEN];
497
498 trace_find_cmdline(entry->pid, comm);
499
500 trace_seq_printf(s, "%8.8s-%-7d %3d",
501 comm, entry->pid, cpu);
502
503 return trace_print_lat_fmt(s, entry);
504}
505
506#undef MARK
507#define MARK(v, s) {.val = v, .sym = s}
508/* trace overhead mark */
509static const struct trace_mark {
510 unsigned long long val; /* unit: nsec */
511 char sym;
512} mark[] = {
513 MARK(1000000000ULL , '$'), /* 1 sec */
514 MARK(100000000ULL , '@'), /* 100 msec */
515 MARK(10000000ULL , '*'), /* 10 msec */
516 MARK(1000000ULL , '#'), /* 1000 usecs */
517 MARK(100000ULL , '!'), /* 100 usecs */
518 MARK(10000ULL , '+'), /* 10 usecs */
519};
520#undef MARK
521
522char trace_find_mark(unsigned long long d)
523{
524 int i;
525 int size = ARRAY_SIZE(mark);
526
527 for (i = 0; i < size; i++) {
528 if (d > mark[i].val)
529 break;
530 }
531
532 return (i == size) ? ' ' : mark[i].sym;
533}
534
535static int
536lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
537{
538 struct trace_array *tr = iter->tr;
539 unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
540 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
541 unsigned long long abs_ts = iter->ts - iter->array_buffer->time_start;
542 unsigned long long rel_ts = next_ts - iter->ts;
543 struct trace_seq *s = &iter->seq;
544
545 if (in_ns) {
546 abs_ts = ns2usecs(abs_ts);
547 rel_ts = ns2usecs(rel_ts);
548 }
549
550 if (verbose && in_ns) {
551 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
552 unsigned long abs_msec = (unsigned long)abs_ts;
553 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
554 unsigned long rel_msec = (unsigned long)rel_ts;
555
556 trace_seq_printf(
557 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
558 ns2usecs(iter->ts),
559 abs_msec, abs_usec,
560 rel_msec, rel_usec);
561
562 } else if (verbose && !in_ns) {
563 trace_seq_printf(
564 s, "[%016llx] %lld (+%lld): ",
565 iter->ts, abs_ts, rel_ts);
566
567 } else if (!verbose && in_ns) {
568 trace_seq_printf(
569 s, " %4lldus%c: ",
570 abs_ts,
571 trace_find_mark(rel_ts * NSEC_PER_USEC));
572
573 } else { /* !verbose && !in_ns */
574 trace_seq_printf(s, " %4lld: ", abs_ts);
575 }
576
577 return !trace_seq_has_overflowed(s);
578}
579
580int trace_print_context(struct trace_iterator *iter)
581{
582 struct trace_array *tr = iter->tr;
583 struct trace_seq *s = &iter->seq;
584 struct trace_entry *entry = iter->ent;
585 unsigned long long t;
586 unsigned long secs, usec_rem;
587 char comm[TASK_COMM_LEN];
588
589 trace_find_cmdline(entry->pid, comm);
590
591 trace_seq_printf(s, "%16s-%-7d ", comm, entry->pid);
592
593 if (tr->trace_flags & TRACE_ITER_RECORD_TGID) {
594 unsigned int tgid = trace_find_tgid(entry->pid);
595
596 if (!tgid)
597 trace_seq_printf(s, "(-------) ");
598 else
599 trace_seq_printf(s, "(%7d) ", tgid);
600 }
601
602 trace_seq_printf(s, "[%03d] ", iter->cpu);
603
604 if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
605 trace_print_lat_fmt(s, entry);
606
607 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
608 t = ns2usecs(iter->ts);
609 usec_rem = do_div(t, USEC_PER_SEC);
610 secs = (unsigned long)t;
611 trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
612 } else
613 trace_seq_printf(s, " %12llu: ", iter->ts);
614
615 return !trace_seq_has_overflowed(s);
616}
617
618int trace_print_lat_context(struct trace_iterator *iter)
619{
620 struct trace_entry *entry, *next_entry;
621 struct trace_array *tr = iter->tr;
622 struct trace_seq *s = &iter->seq;
623 unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
624 u64 next_ts;
625
626 next_entry = trace_find_next_entry(iter, NULL, &next_ts);
627 if (!next_entry)
628 next_ts = iter->ts;
629
630 /* trace_find_next_entry() may change iter->ent */
631 entry = iter->ent;
632
633 if (verbose) {
634 char comm[TASK_COMM_LEN];
635
636 trace_find_cmdline(entry->pid, comm);
637
638 trace_seq_printf(
639 s, "%16s %7d %3d %d %08x %08lx ",
640 comm, entry->pid, iter->cpu, entry->flags,
641 entry->preempt_count, iter->idx);
642 } else {
643 lat_print_generic(s, entry, iter->cpu);
644 }
645
646 lat_print_timestamp(iter, next_ts);
647
648 return !trace_seq_has_overflowed(s);
649}
650
651/**
652 * ftrace_find_event - find a registered event
653 * @type: the type of event to look for
654 *
655 * Returns an event of type @type otherwise NULL
656 * Called with trace_event_read_lock() held.
657 */
658struct trace_event *ftrace_find_event(int type)
659{
660 struct trace_event *event;
661 unsigned key;
662
663 key = type & (EVENT_HASHSIZE - 1);
664
665 hlist_for_each_entry(event, &event_hash[key], node) {
666 if (event->type == type)
667 return event;
668 }
669
670 return NULL;
671}
672
673static LIST_HEAD(ftrace_event_list);
674
675static int trace_search_list(struct list_head **list)
676{
677 struct trace_event *e;
678 int next = __TRACE_LAST_TYPE;
679
680 if (list_empty(&ftrace_event_list)) {
681 *list = &ftrace_event_list;
682 return next;
683 }
684
685 /*
686 * We used up all possible max events,
687 * lets see if somebody freed one.
688 */
689 list_for_each_entry(e, &ftrace_event_list, list) {
690 if (e->type != next)
691 break;
692 next++;
693 }
694
695 /* Did we used up all 65 thousand events??? */
696 if (next > TRACE_EVENT_TYPE_MAX)
697 return 0;
698
699 *list = &e->list;
700 return next;
701}
702
703void trace_event_read_lock(void)
704{
705 down_read(&trace_event_sem);
706}
707
708void trace_event_read_unlock(void)
709{
710 up_read(&trace_event_sem);
711}
712
713/**
714 * register_trace_event - register output for an event type
715 * @event: the event type to register
716 *
717 * Event types are stored in a hash and this hash is used to
718 * find a way to print an event. If the @event->type is set
719 * then it will use that type, otherwise it will assign a
720 * type to use.
721 *
722 * If you assign your own type, please make sure it is added
723 * to the trace_type enum in trace.h, to avoid collisions
724 * with the dynamic types.
725 *
726 * Returns the event type number or zero on error.
727 */
728int register_trace_event(struct trace_event *event)
729{
730 unsigned key;
731 int ret = 0;
732
733 down_write(&trace_event_sem);
734
735 if (WARN_ON(!event))
736 goto out;
737
738 if (WARN_ON(!event->funcs))
739 goto out;
740
741 INIT_LIST_HEAD(&event->list);
742
743 if (!event->type) {
744 struct list_head *list = NULL;
745
746 if (next_event_type > TRACE_EVENT_TYPE_MAX) {
747
748 event->type = trace_search_list(&list);
749 if (!event->type)
750 goto out;
751
752 } else {
753
754 event->type = next_event_type++;
755 list = &ftrace_event_list;
756 }
757
758 if (WARN_ON(ftrace_find_event(event->type)))
759 goto out;
760
761 list_add_tail(&event->list, list);
762
763 } else if (event->type > __TRACE_LAST_TYPE) {
764 printk(KERN_WARNING "Need to add type to trace.h\n");
765 WARN_ON(1);
766 goto out;
767 } else {
768 /* Is this event already used */
769 if (ftrace_find_event(event->type))
770 goto out;
771 }
772
773 if (event->funcs->trace == NULL)
774 event->funcs->trace = trace_nop_print;
775 if (event->funcs->raw == NULL)
776 event->funcs->raw = trace_nop_print;
777 if (event->funcs->hex == NULL)
778 event->funcs->hex = trace_nop_print;
779 if (event->funcs->binary == NULL)
780 event->funcs->binary = trace_nop_print;
781
782 key = event->type & (EVENT_HASHSIZE - 1);
783
784 hlist_add_head(&event->node, &event_hash[key]);
785
786 ret = event->type;
787 out:
788 up_write(&trace_event_sem);
789
790 return ret;
791}
792EXPORT_SYMBOL_GPL(register_trace_event);
793
794/*
795 * Used by module code with the trace_event_sem held for write.
796 */
797int __unregister_trace_event(struct trace_event *event)
798{
799 hlist_del(&event->node);
800 list_del(&event->list);
801 return 0;
802}
803
804/**
805 * unregister_trace_event - remove a no longer used event
806 * @event: the event to remove
807 */
808int unregister_trace_event(struct trace_event *event)
809{
810 down_write(&trace_event_sem);
811 __unregister_trace_event(event);
812 up_write(&trace_event_sem);
813
814 return 0;
815}
816EXPORT_SYMBOL_GPL(unregister_trace_event);
817
818/*
819 * Standard events
820 */
821
822enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
823 struct trace_event *event)
824{
825 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
826
827 return trace_handle_return(&iter->seq);
828}
829
830/* TRACE_FN */
831static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
832 struct trace_event *event)
833{
834 struct ftrace_entry *field;
835 struct trace_seq *s = &iter->seq;
836
837 trace_assign_type(field, iter->ent);
838
839 seq_print_ip_sym(s, field->ip, flags);
840
841 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
842 trace_seq_puts(s, " <-");
843 seq_print_ip_sym(s, field->parent_ip, flags);
844 }
845
846 trace_seq_putc(s, '\n');
847
848 return trace_handle_return(s);
849}
850
851static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
852 struct trace_event *event)
853{
854 struct ftrace_entry *field;
855
856 trace_assign_type(field, iter->ent);
857
858 trace_seq_printf(&iter->seq, "%lx %lx\n",
859 field->ip,
860 field->parent_ip);
861
862 return trace_handle_return(&iter->seq);
863}
864
865static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
866 struct trace_event *event)
867{
868 struct ftrace_entry *field;
869 struct trace_seq *s = &iter->seq;
870
871 trace_assign_type(field, iter->ent);
872
873 SEQ_PUT_HEX_FIELD(s, field->ip);
874 SEQ_PUT_HEX_FIELD(s, field->parent_ip);
875
876 return trace_handle_return(s);
877}
878
879static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
880 struct trace_event *event)
881{
882 struct ftrace_entry *field;
883 struct trace_seq *s = &iter->seq;
884
885 trace_assign_type(field, iter->ent);
886
887 SEQ_PUT_FIELD(s, field->ip);
888 SEQ_PUT_FIELD(s, field->parent_ip);
889
890 return trace_handle_return(s);
891}
892
893static struct trace_event_functions trace_fn_funcs = {
894 .trace = trace_fn_trace,
895 .raw = trace_fn_raw,
896 .hex = trace_fn_hex,
897 .binary = trace_fn_bin,
898};
899
900static struct trace_event trace_fn_event = {
901 .type = TRACE_FN,
902 .funcs = &trace_fn_funcs,
903};
904
905/* TRACE_CTX an TRACE_WAKE */
906static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
907 char *delim)
908{
909 struct ctx_switch_entry *field;
910 char comm[TASK_COMM_LEN];
911 int S, T;
912
913
914 trace_assign_type(field, iter->ent);
915
916 T = task_index_to_char(field->next_state);
917 S = task_index_to_char(field->prev_state);
918 trace_find_cmdline(field->next_pid, comm);
919 trace_seq_printf(&iter->seq,
920 " %7d:%3d:%c %s [%03d] %7d:%3d:%c %s\n",
921 field->prev_pid,
922 field->prev_prio,
923 S, delim,
924 field->next_cpu,
925 field->next_pid,
926 field->next_prio,
927 T, comm);
928
929 return trace_handle_return(&iter->seq);
930}
931
932static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
933 struct trace_event *event)
934{
935 return trace_ctxwake_print(iter, "==>");
936}
937
938static enum print_line_t trace_wake_print(struct trace_iterator *iter,
939 int flags, struct trace_event *event)
940{
941 return trace_ctxwake_print(iter, " +");
942}
943
944static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
945{
946 struct ctx_switch_entry *field;
947 int T;
948
949 trace_assign_type(field, iter->ent);
950
951 if (!S)
952 S = task_index_to_char(field->prev_state);
953 T = task_index_to_char(field->next_state);
954 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
955 field->prev_pid,
956 field->prev_prio,
957 S,
958 field->next_cpu,
959 field->next_pid,
960 field->next_prio,
961 T);
962
963 return trace_handle_return(&iter->seq);
964}
965
966static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
967 struct trace_event *event)
968{
969 return trace_ctxwake_raw(iter, 0);
970}
971
972static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
973 struct trace_event *event)
974{
975 return trace_ctxwake_raw(iter, '+');
976}
977
978
979static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
980{
981 struct ctx_switch_entry *field;
982 struct trace_seq *s = &iter->seq;
983 int T;
984
985 trace_assign_type(field, iter->ent);
986
987 if (!S)
988 S = task_index_to_char(field->prev_state);
989 T = task_index_to_char(field->next_state);
990
991 SEQ_PUT_HEX_FIELD(s, field->prev_pid);
992 SEQ_PUT_HEX_FIELD(s, field->prev_prio);
993 SEQ_PUT_HEX_FIELD(s, S);
994 SEQ_PUT_HEX_FIELD(s, field->next_cpu);
995 SEQ_PUT_HEX_FIELD(s, field->next_pid);
996 SEQ_PUT_HEX_FIELD(s, field->next_prio);
997 SEQ_PUT_HEX_FIELD(s, T);
998
999 return trace_handle_return(s);
1000}
1001
1002static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1003 struct trace_event *event)
1004{
1005 return trace_ctxwake_hex(iter, 0);
1006}
1007
1008static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1009 struct trace_event *event)
1010{
1011 return trace_ctxwake_hex(iter, '+');
1012}
1013
1014static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1015 int flags, struct trace_event *event)
1016{
1017 struct ctx_switch_entry *field;
1018 struct trace_seq *s = &iter->seq;
1019
1020 trace_assign_type(field, iter->ent);
1021
1022 SEQ_PUT_FIELD(s, field->prev_pid);
1023 SEQ_PUT_FIELD(s, field->prev_prio);
1024 SEQ_PUT_FIELD(s, field->prev_state);
1025 SEQ_PUT_FIELD(s, field->next_cpu);
1026 SEQ_PUT_FIELD(s, field->next_pid);
1027 SEQ_PUT_FIELD(s, field->next_prio);
1028 SEQ_PUT_FIELD(s, field->next_state);
1029
1030 return trace_handle_return(s);
1031}
1032
1033static struct trace_event_functions trace_ctx_funcs = {
1034 .trace = trace_ctx_print,
1035 .raw = trace_ctx_raw,
1036 .hex = trace_ctx_hex,
1037 .binary = trace_ctxwake_bin,
1038};
1039
1040static struct trace_event trace_ctx_event = {
1041 .type = TRACE_CTX,
1042 .funcs = &trace_ctx_funcs,
1043};
1044
1045static struct trace_event_functions trace_wake_funcs = {
1046 .trace = trace_wake_print,
1047 .raw = trace_wake_raw,
1048 .hex = trace_wake_hex,
1049 .binary = trace_ctxwake_bin,
1050};
1051
1052static struct trace_event trace_wake_event = {
1053 .type = TRACE_WAKE,
1054 .funcs = &trace_wake_funcs,
1055};
1056
1057/* TRACE_STACK */
1058
1059static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1060 int flags, struct trace_event *event)
1061{
1062 struct stack_entry *field;
1063 struct trace_seq *s = &iter->seq;
1064 unsigned long *p;
1065 unsigned long *end;
1066
1067 trace_assign_type(field, iter->ent);
1068 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1069
1070 trace_seq_puts(s, "<stack trace>\n");
1071
1072 for (p = field->caller; p && p < end && *p != ULONG_MAX; p++) {
1073
1074 if (trace_seq_has_overflowed(s))
1075 break;
1076
1077 trace_seq_puts(s, " => ");
1078 seq_print_ip_sym(s, *p, flags);
1079 trace_seq_putc(s, '\n');
1080 }
1081
1082 return trace_handle_return(s);
1083}
1084
1085static struct trace_event_functions trace_stack_funcs = {
1086 .trace = trace_stack_print,
1087};
1088
1089static struct trace_event trace_stack_event = {
1090 .type = TRACE_STACK,
1091 .funcs = &trace_stack_funcs,
1092};
1093
1094/* TRACE_USER_STACK */
1095static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1096 int flags, struct trace_event *event)
1097{
1098 struct trace_array *tr = iter->tr;
1099 struct userstack_entry *field;
1100 struct trace_seq *s = &iter->seq;
1101 struct mm_struct *mm = NULL;
1102 unsigned int i;
1103
1104 trace_assign_type(field, iter->ent);
1105
1106 trace_seq_puts(s, "<user stack trace>\n");
1107
1108 if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
1109 struct task_struct *task;
1110 /*
1111 * we do the lookup on the thread group leader,
1112 * since individual threads might have already quit!
1113 */
1114 rcu_read_lock();
1115 task = find_task_by_vpid(field->tgid);
1116 if (task)
1117 mm = get_task_mm(task);
1118 rcu_read_unlock();
1119 }
1120
1121 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1122 unsigned long ip = field->caller[i];
1123
1124 if (!ip || trace_seq_has_overflowed(s))
1125 break;
1126
1127 trace_seq_puts(s, " => ");
1128 seq_print_user_ip(s, mm, ip, flags);
1129 trace_seq_putc(s, '\n');
1130 }
1131
1132 if (mm)
1133 mmput(mm);
1134
1135 return trace_handle_return(s);
1136}
1137
1138static struct trace_event_functions trace_user_stack_funcs = {
1139 .trace = trace_user_stack_print,
1140};
1141
1142static struct trace_event trace_user_stack_event = {
1143 .type = TRACE_USER_STACK,
1144 .funcs = &trace_user_stack_funcs,
1145};
1146
1147/* TRACE_HWLAT */
1148static enum print_line_t
1149trace_hwlat_print(struct trace_iterator *iter, int flags,
1150 struct trace_event *event)
1151{
1152 struct trace_entry *entry = iter->ent;
1153 struct trace_seq *s = &iter->seq;
1154 struct hwlat_entry *field;
1155
1156 trace_assign_type(field, entry);
1157
1158 trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld count:%d",
1159 field->seqnum,
1160 field->duration,
1161 field->outer_duration,
1162 (long long)field->timestamp.tv_sec,
1163 field->timestamp.tv_nsec, field->count);
1164
1165 if (field->nmi_count) {
1166 /*
1167 * The generic sched_clock() is not NMI safe, thus
1168 * we only record the count and not the time.
1169 */
1170 if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK))
1171 trace_seq_printf(s, " nmi-total:%llu",
1172 field->nmi_total_ts);
1173 trace_seq_printf(s, " nmi-count:%u",
1174 field->nmi_count);
1175 }
1176
1177 trace_seq_putc(s, '\n');
1178
1179 return trace_handle_return(s);
1180}
1181
1182
1183static enum print_line_t
1184trace_hwlat_raw(struct trace_iterator *iter, int flags,
1185 struct trace_event *event)
1186{
1187 struct hwlat_entry *field;
1188 struct trace_seq *s = &iter->seq;
1189
1190 trace_assign_type(field, iter->ent);
1191
1192 trace_seq_printf(s, "%llu %lld %lld %09ld %u\n",
1193 field->duration,
1194 field->outer_duration,
1195 (long long)field->timestamp.tv_sec,
1196 field->timestamp.tv_nsec,
1197 field->seqnum);
1198
1199 return trace_handle_return(s);
1200}
1201
1202static struct trace_event_functions trace_hwlat_funcs = {
1203 .trace = trace_hwlat_print,
1204 .raw = trace_hwlat_raw,
1205};
1206
1207static struct trace_event trace_hwlat_event = {
1208 .type = TRACE_HWLAT,
1209 .funcs = &trace_hwlat_funcs,
1210};
1211
1212/* TRACE_BPUTS */
1213static enum print_line_t
1214trace_bputs_print(struct trace_iterator *iter, int flags,
1215 struct trace_event *event)
1216{
1217 struct trace_entry *entry = iter->ent;
1218 struct trace_seq *s = &iter->seq;
1219 struct bputs_entry *field;
1220
1221 trace_assign_type(field, entry);
1222
1223 seq_print_ip_sym(s, field->ip, flags);
1224 trace_seq_puts(s, ": ");
1225 trace_seq_puts(s, field->str);
1226
1227 return trace_handle_return(s);
1228}
1229
1230
1231static enum print_line_t
1232trace_bputs_raw(struct trace_iterator *iter, int flags,
1233 struct trace_event *event)
1234{
1235 struct bputs_entry *field;
1236 struct trace_seq *s = &iter->seq;
1237
1238 trace_assign_type(field, iter->ent);
1239
1240 trace_seq_printf(s, ": %lx : ", field->ip);
1241 trace_seq_puts(s, field->str);
1242
1243 return trace_handle_return(s);
1244}
1245
1246static struct trace_event_functions trace_bputs_funcs = {
1247 .trace = trace_bputs_print,
1248 .raw = trace_bputs_raw,
1249};
1250
1251static struct trace_event trace_bputs_event = {
1252 .type = TRACE_BPUTS,
1253 .funcs = &trace_bputs_funcs,
1254};
1255
1256/* TRACE_BPRINT */
1257static enum print_line_t
1258trace_bprint_print(struct trace_iterator *iter, int flags,
1259 struct trace_event *event)
1260{
1261 struct trace_entry *entry = iter->ent;
1262 struct trace_seq *s = &iter->seq;
1263 struct bprint_entry *field;
1264
1265 trace_assign_type(field, entry);
1266
1267 seq_print_ip_sym(s, field->ip, flags);
1268 trace_seq_puts(s, ": ");
1269 trace_seq_bprintf(s, field->fmt, field->buf);
1270
1271 return trace_handle_return(s);
1272}
1273
1274
1275static enum print_line_t
1276trace_bprint_raw(struct trace_iterator *iter, int flags,
1277 struct trace_event *event)
1278{
1279 struct bprint_entry *field;
1280 struct trace_seq *s = &iter->seq;
1281
1282 trace_assign_type(field, iter->ent);
1283
1284 trace_seq_printf(s, ": %lx : ", field->ip);
1285 trace_seq_bprintf(s, field->fmt, field->buf);
1286
1287 return trace_handle_return(s);
1288}
1289
1290static struct trace_event_functions trace_bprint_funcs = {
1291 .trace = trace_bprint_print,
1292 .raw = trace_bprint_raw,
1293};
1294
1295static struct trace_event trace_bprint_event = {
1296 .type = TRACE_BPRINT,
1297 .funcs = &trace_bprint_funcs,
1298};
1299
1300/* TRACE_PRINT */
1301static enum print_line_t trace_print_print(struct trace_iterator *iter,
1302 int flags, struct trace_event *event)
1303{
1304 struct print_entry *field;
1305 struct trace_seq *s = &iter->seq;
1306
1307 trace_assign_type(field, iter->ent);
1308
1309 seq_print_ip_sym(s, field->ip, flags);
1310 trace_seq_printf(s, ": %s", field->buf);
1311
1312 return trace_handle_return(s);
1313}
1314
1315static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1316 struct trace_event *event)
1317{
1318 struct print_entry *field;
1319
1320 trace_assign_type(field, iter->ent);
1321
1322 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1323
1324 return trace_handle_return(&iter->seq);
1325}
1326
1327static struct trace_event_functions trace_print_funcs = {
1328 .trace = trace_print_print,
1329 .raw = trace_print_raw,
1330};
1331
1332static struct trace_event trace_print_event = {
1333 .type = TRACE_PRINT,
1334 .funcs = &trace_print_funcs,
1335};
1336
1337static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags,
1338 struct trace_event *event)
1339{
1340 struct raw_data_entry *field;
1341 int i;
1342
1343 trace_assign_type(field, iter->ent);
1344
1345 trace_seq_printf(&iter->seq, "# %x buf:", field->id);
1346
1347 for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++)
1348 trace_seq_printf(&iter->seq, " %02x",
1349 (unsigned char)field->buf[i]);
1350
1351 trace_seq_putc(&iter->seq, '\n');
1352
1353 return trace_handle_return(&iter->seq);
1354}
1355
1356static struct trace_event_functions trace_raw_data_funcs = {
1357 .trace = trace_raw_data,
1358 .raw = trace_raw_data,
1359};
1360
1361static struct trace_event trace_raw_data_event = {
1362 .type = TRACE_RAW_DATA,
1363 .funcs = &trace_raw_data_funcs,
1364};
1365
1366
1367static struct trace_event *events[] __initdata = {
1368 &trace_fn_event,
1369 &trace_ctx_event,
1370 &trace_wake_event,
1371 &trace_stack_event,
1372 &trace_user_stack_event,
1373 &trace_bputs_event,
1374 &trace_bprint_event,
1375 &trace_print_event,
1376 &trace_hwlat_event,
1377 &trace_raw_data_event,
1378 NULL
1379};
1380
1381__init static int init_events(void)
1382{
1383 struct trace_event *event;
1384 int i, ret;
1385
1386 for (i = 0; events[i]; i++) {
1387 event = events[i];
1388
1389 ret = register_trace_event(event);
1390 if (!ret) {
1391 printk(KERN_WARNING "event %d failed to register\n",
1392 event->type);
1393 WARN_ON_ONCE(1);
1394 }
1395 }
1396
1397 return 0;
1398}
1399early_initcall(init_events);