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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/kprobes.h>
12#include <linux/sched/clock.h>
13#include <linux/sched/mm.h>
14#include <linux/idr.h>
15
16#include "trace_output.h"
17
18/* must be a power of 2 */
19#define EVENT_HASHSIZE 128
20
21DECLARE_RWSEM(trace_event_sem);
22
23static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
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 if (!concatenate && i != 0)
226 trace_seq_putc(p, ' ');
227 trace_seq_printf(p, fmt, min(buf_len - i, 16), &buf[i]);
228 }
229 trace_seq_putc(p, 0);
230
231 return ret;
232}
233EXPORT_SYMBOL(trace_print_hex_seq);
234
235const char *
236trace_print_array_seq(struct trace_seq *p, const void *buf, int count,
237 size_t el_size)
238{
239 const char *ret = trace_seq_buffer_ptr(p);
240 const char *prefix = "";
241 void *ptr = (void *)buf;
242 size_t buf_len = count * el_size;
243
244 trace_seq_putc(p, '{');
245
246 while (ptr < buf + buf_len) {
247 switch (el_size) {
248 case 1:
249 trace_seq_printf(p, "%s0x%x", prefix,
250 *(u8 *)ptr);
251 break;
252 case 2:
253 trace_seq_printf(p, "%s0x%x", prefix,
254 *(u16 *)ptr);
255 break;
256 case 4:
257 trace_seq_printf(p, "%s0x%x", prefix,
258 *(u32 *)ptr);
259 break;
260 case 8:
261 trace_seq_printf(p, "%s0x%llx", prefix,
262 *(u64 *)ptr);
263 break;
264 default:
265 trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
266 *(u8 *)ptr);
267 el_size = 1;
268 }
269 prefix = ",";
270 ptr += el_size;
271 }
272
273 trace_seq_putc(p, '}');
274 trace_seq_putc(p, 0);
275
276 return ret;
277}
278EXPORT_SYMBOL(trace_print_array_seq);
279
280const char *
281trace_print_hex_dump_seq(struct trace_seq *p, const char *prefix_str,
282 int prefix_type, int rowsize, int groupsize,
283 const void *buf, size_t len, bool ascii)
284{
285 const char *ret = trace_seq_buffer_ptr(p);
286
287 trace_seq_putc(p, '\n');
288 trace_seq_hex_dump(p, prefix_str, prefix_type,
289 rowsize, groupsize, buf, len, ascii);
290 trace_seq_putc(p, 0);
291 return ret;
292}
293EXPORT_SYMBOL(trace_print_hex_dump_seq);
294
295int trace_raw_output_prep(struct trace_iterator *iter,
296 struct trace_event *trace_event)
297{
298 struct trace_event_call *event;
299 struct trace_seq *s = &iter->seq;
300 struct trace_seq *p = &iter->tmp_seq;
301 struct trace_entry *entry;
302
303 event = container_of(trace_event, struct trace_event_call, event);
304 entry = iter->ent;
305
306 if (entry->type != event->event.type) {
307 WARN_ON_ONCE(1);
308 return TRACE_TYPE_UNHANDLED;
309 }
310
311 trace_seq_init(p);
312 trace_seq_printf(s, "%s: ", trace_event_name(event));
313
314 return trace_handle_return(s);
315}
316EXPORT_SYMBOL(trace_raw_output_prep);
317
318void trace_event_printf(struct trace_iterator *iter, const char *fmt, ...)
319{
320 va_list ap;
321
322 va_start(ap, fmt);
323 trace_check_vprintf(iter, trace_event_format(iter, fmt), ap);
324 va_end(ap);
325}
326EXPORT_SYMBOL(trace_event_printf);
327
328static __printf(3, 0)
329int trace_output_raw(struct trace_iterator *iter, char *name,
330 char *fmt, va_list ap)
331{
332 struct trace_seq *s = &iter->seq;
333
334 trace_seq_printf(s, "%s: ", name);
335 trace_seq_vprintf(s, trace_event_format(iter, fmt), ap);
336
337 return trace_handle_return(s);
338}
339
340int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
341{
342 va_list ap;
343 int ret;
344
345 va_start(ap, fmt);
346 ret = trace_output_raw(iter, name, fmt, ap);
347 va_end(ap);
348
349 return ret;
350}
351EXPORT_SYMBOL_GPL(trace_output_call);
352
353static inline const char *kretprobed(const char *name, unsigned long addr)
354{
355 if (is_kretprobe_trampoline(addr))
356 return "[unknown/kretprobe'd]";
357 return name;
358}
359
360void
361trace_seq_print_sym(struct trace_seq *s, unsigned long address, bool offset)
362{
363#ifdef CONFIG_KALLSYMS
364 char str[KSYM_SYMBOL_LEN];
365 const char *name;
366
367 if (offset)
368 sprint_symbol(str, address);
369 else
370 kallsyms_lookup(address, NULL, NULL, NULL, str);
371 name = kretprobed(str, address);
372
373 if (name && strlen(name)) {
374 trace_seq_puts(s, name);
375 return;
376 }
377#endif
378 trace_seq_printf(s, "0x%08lx", address);
379}
380
381#ifndef CONFIG_64BIT
382# define IP_FMT "%08lx"
383#else
384# define IP_FMT "%016lx"
385#endif
386
387static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
388 unsigned long ip, unsigned long sym_flags)
389{
390 struct file *file = NULL;
391 unsigned long vmstart = 0;
392 int ret = 1;
393
394 if (s->full)
395 return 0;
396
397 if (mm) {
398 const struct vm_area_struct *vma;
399
400 mmap_read_lock(mm);
401 vma = find_vma(mm, ip);
402 if (vma) {
403 file = vma->vm_file;
404 vmstart = vma->vm_start;
405 }
406 if (file) {
407 ret = trace_seq_path(s, file_user_path(file));
408 if (ret)
409 trace_seq_printf(s, "[+0x%lx]",
410 ip - vmstart);
411 }
412 mmap_read_unlock(mm);
413 }
414 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
415 trace_seq_printf(s, " <" IP_FMT ">", ip);
416 return !trace_seq_has_overflowed(s);
417}
418
419int
420seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
421{
422 if (!ip) {
423 trace_seq_putc(s, '0');
424 goto out;
425 }
426
427 trace_seq_print_sym(s, ip, sym_flags & TRACE_ITER_SYM_OFFSET);
428
429 if (sym_flags & TRACE_ITER_SYM_ADDR)
430 trace_seq_printf(s, " <" IP_FMT ">", ip);
431
432 out:
433 return !trace_seq_has_overflowed(s);
434}
435
436/**
437 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
438 * @s: trace seq struct to write to
439 * @entry: The trace entry field from the ring buffer
440 *
441 * Prints the generic fields of irqs off, in hard or softirq, preempt
442 * count.
443 */
444int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
445{
446 char hardsoft_irq;
447 char need_resched;
448 char irqs_off;
449 int hardirq;
450 int softirq;
451 int bh_off;
452 int nmi;
453
454 nmi = entry->flags & TRACE_FLAG_NMI;
455 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
456 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
457 bh_off = entry->flags & TRACE_FLAG_BH_OFF;
458
459 irqs_off =
460 (entry->flags & TRACE_FLAG_IRQS_OFF && bh_off) ? 'D' :
461 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
462 bh_off ? 'b' :
463 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
464 '.';
465
466 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
467 TRACE_FLAG_PREEMPT_RESCHED)) {
468 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
469 need_resched = 'N';
470 break;
471 case TRACE_FLAG_NEED_RESCHED:
472 need_resched = 'n';
473 break;
474 case TRACE_FLAG_PREEMPT_RESCHED:
475 need_resched = 'p';
476 break;
477 default:
478 need_resched = '.';
479 break;
480 }
481
482 hardsoft_irq =
483 (nmi && hardirq) ? 'Z' :
484 nmi ? 'z' :
485 (hardirq && softirq) ? 'H' :
486 hardirq ? 'h' :
487 softirq ? 's' :
488 '.' ;
489
490 trace_seq_printf(s, "%c%c%c",
491 irqs_off, need_resched, hardsoft_irq);
492
493 if (entry->preempt_count & 0xf)
494 trace_seq_printf(s, "%x", entry->preempt_count & 0xf);
495 else
496 trace_seq_putc(s, '.');
497
498 if (entry->preempt_count & 0xf0)
499 trace_seq_printf(s, "%x", entry->preempt_count >> 4);
500 else
501 trace_seq_putc(s, '.');
502
503 return !trace_seq_has_overflowed(s);
504}
505
506static int
507lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
508{
509 char comm[TASK_COMM_LEN];
510
511 trace_find_cmdline(entry->pid, comm);
512
513 trace_seq_printf(s, "%8.8s-%-7d %3d",
514 comm, entry->pid, cpu);
515
516 return trace_print_lat_fmt(s, entry);
517}
518
519#undef MARK
520#define MARK(v, s) {.val = v, .sym = s}
521/* trace overhead mark */
522static const struct trace_mark {
523 unsigned long long val; /* unit: nsec */
524 char sym;
525} mark[] = {
526 MARK(1000000000ULL , '$'), /* 1 sec */
527 MARK(100000000ULL , '@'), /* 100 msec */
528 MARK(10000000ULL , '*'), /* 10 msec */
529 MARK(1000000ULL , '#'), /* 1000 usecs */
530 MARK(100000ULL , '!'), /* 100 usecs */
531 MARK(10000ULL , '+'), /* 10 usecs */
532};
533#undef MARK
534
535char trace_find_mark(unsigned long long d)
536{
537 int i;
538 int size = ARRAY_SIZE(mark);
539
540 for (i = 0; i < size; i++) {
541 if (d > mark[i].val)
542 break;
543 }
544
545 return (i == size) ? ' ' : mark[i].sym;
546}
547
548static int
549lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
550{
551 struct trace_array *tr = iter->tr;
552 unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
553 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
554 unsigned long long abs_ts = iter->ts - iter->array_buffer->time_start;
555 unsigned long long rel_ts = next_ts - iter->ts;
556 struct trace_seq *s = &iter->seq;
557
558 if (in_ns) {
559 abs_ts = ns2usecs(abs_ts);
560 rel_ts = ns2usecs(rel_ts);
561 }
562
563 if (verbose && in_ns) {
564 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
565 unsigned long abs_msec = (unsigned long)abs_ts;
566 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
567 unsigned long rel_msec = (unsigned long)rel_ts;
568
569 trace_seq_printf(
570 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
571 ns2usecs(iter->ts),
572 abs_msec, abs_usec,
573 rel_msec, rel_usec);
574
575 } else if (verbose && !in_ns) {
576 trace_seq_printf(
577 s, "[%016llx] %lld (+%lld): ",
578 iter->ts, abs_ts, rel_ts);
579
580 } else if (!verbose && in_ns) {
581 trace_seq_printf(
582 s, " %4lldus%c: ",
583 abs_ts,
584 trace_find_mark(rel_ts * NSEC_PER_USEC));
585
586 } else { /* !verbose && !in_ns */
587 trace_seq_printf(s, " %4lld: ", abs_ts);
588 }
589
590 return !trace_seq_has_overflowed(s);
591}
592
593static void trace_print_time(struct trace_seq *s, struct trace_iterator *iter,
594 unsigned long long ts)
595{
596 unsigned long secs, usec_rem;
597 unsigned long long t;
598
599 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
600 t = ns2usecs(ts);
601 usec_rem = do_div(t, USEC_PER_SEC);
602 secs = (unsigned long)t;
603 trace_seq_printf(s, " %5lu.%06lu", secs, usec_rem);
604 } else
605 trace_seq_printf(s, " %12llu", ts);
606}
607
608int trace_print_context(struct trace_iterator *iter)
609{
610 struct trace_array *tr = iter->tr;
611 struct trace_seq *s = &iter->seq;
612 struct trace_entry *entry = iter->ent;
613 char comm[TASK_COMM_LEN];
614
615 trace_find_cmdline(entry->pid, comm);
616
617 trace_seq_printf(s, "%16s-%-7d ", comm, entry->pid);
618
619 if (tr->trace_flags & TRACE_ITER_RECORD_TGID) {
620 unsigned int tgid = trace_find_tgid(entry->pid);
621
622 if (!tgid)
623 trace_seq_printf(s, "(-------) ");
624 else
625 trace_seq_printf(s, "(%7d) ", tgid);
626 }
627
628 trace_seq_printf(s, "[%03d] ", iter->cpu);
629
630 if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
631 trace_print_lat_fmt(s, entry);
632
633 trace_print_time(s, iter, iter->ts);
634 trace_seq_puts(s, ": ");
635
636 return !trace_seq_has_overflowed(s);
637}
638
639int trace_print_lat_context(struct trace_iterator *iter)
640{
641 struct trace_entry *entry, *next_entry;
642 struct trace_array *tr = iter->tr;
643 struct trace_seq *s = &iter->seq;
644 unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
645 u64 next_ts;
646
647 next_entry = trace_find_next_entry(iter, NULL, &next_ts);
648 if (!next_entry)
649 next_ts = iter->ts;
650
651 /* trace_find_next_entry() may change iter->ent */
652 entry = iter->ent;
653
654 if (verbose) {
655 char comm[TASK_COMM_LEN];
656
657 trace_find_cmdline(entry->pid, comm);
658
659 trace_seq_printf(
660 s, "%16s %7d %3d %d %08x %08lx ",
661 comm, entry->pid, iter->cpu, entry->flags,
662 entry->preempt_count & 0xf, iter->idx);
663 } else {
664 lat_print_generic(s, entry, iter->cpu);
665 }
666
667 lat_print_timestamp(iter, next_ts);
668
669 return !trace_seq_has_overflowed(s);
670}
671
672/**
673 * ftrace_find_event - find a registered event
674 * @type: the type of event to look for
675 *
676 * Returns an event of type @type otherwise NULL
677 * Called with trace_event_read_lock() held.
678 */
679struct trace_event *ftrace_find_event(int type)
680{
681 struct trace_event *event;
682 unsigned key;
683
684 key = type & (EVENT_HASHSIZE - 1);
685
686 hlist_for_each_entry(event, &event_hash[key], node) {
687 if (event->type == type)
688 return event;
689 }
690
691 return NULL;
692}
693
694static DEFINE_IDA(trace_event_ida);
695
696static void free_trace_event_type(int type)
697{
698 if (type >= __TRACE_LAST_TYPE)
699 ida_free(&trace_event_ida, type);
700}
701
702static int alloc_trace_event_type(void)
703{
704 int next;
705
706 /* Skip static defined type numbers */
707 next = ida_alloc_range(&trace_event_ida, __TRACE_LAST_TYPE,
708 TRACE_EVENT_TYPE_MAX, GFP_KERNEL);
709 if (next < 0)
710 return 0;
711 return next;
712}
713
714void trace_event_read_lock(void)
715{
716 down_read(&trace_event_sem);
717}
718
719void trace_event_read_unlock(void)
720{
721 up_read(&trace_event_sem);
722}
723
724/**
725 * register_trace_event - register output for an event type
726 * @event: the event type to register
727 *
728 * Event types are stored in a hash and this hash is used to
729 * find a way to print an event. If the @event->type is set
730 * then it will use that type, otherwise it will assign a
731 * type to use.
732 *
733 * If you assign your own type, please make sure it is added
734 * to the trace_type enum in trace.h, to avoid collisions
735 * with the dynamic types.
736 *
737 * Returns the event type number or zero on error.
738 */
739int register_trace_event(struct trace_event *event)
740{
741 unsigned key;
742 int ret = 0;
743
744 down_write(&trace_event_sem);
745
746 if (WARN_ON(!event))
747 goto out;
748
749 if (WARN_ON(!event->funcs))
750 goto out;
751
752 if (!event->type) {
753 event->type = alloc_trace_event_type();
754 if (!event->type)
755 goto out;
756 } else if (WARN(event->type > __TRACE_LAST_TYPE,
757 "Need to add type to trace.h")) {
758 goto out;
759 } else {
760 /* Is this event already used */
761 if (ftrace_find_event(event->type))
762 goto out;
763 }
764
765 if (event->funcs->trace == NULL)
766 event->funcs->trace = trace_nop_print;
767 if (event->funcs->raw == NULL)
768 event->funcs->raw = trace_nop_print;
769 if (event->funcs->hex == NULL)
770 event->funcs->hex = trace_nop_print;
771 if (event->funcs->binary == NULL)
772 event->funcs->binary = trace_nop_print;
773
774 key = event->type & (EVENT_HASHSIZE - 1);
775
776 hlist_add_head(&event->node, &event_hash[key]);
777
778 ret = event->type;
779 out:
780 up_write(&trace_event_sem);
781
782 return ret;
783}
784EXPORT_SYMBOL_GPL(register_trace_event);
785
786/*
787 * Used by module code with the trace_event_sem held for write.
788 */
789int __unregister_trace_event(struct trace_event *event)
790{
791 hlist_del(&event->node);
792 free_trace_event_type(event->type);
793 return 0;
794}
795
796/**
797 * unregister_trace_event - remove a no longer used event
798 * @event: the event to remove
799 */
800int unregister_trace_event(struct trace_event *event)
801{
802 down_write(&trace_event_sem);
803 __unregister_trace_event(event);
804 up_write(&trace_event_sem);
805
806 return 0;
807}
808EXPORT_SYMBOL_GPL(unregister_trace_event);
809
810/*
811 * Standard events
812 */
813
814static void print_array(struct trace_iterator *iter, void *pos,
815 struct ftrace_event_field *field)
816{
817 int offset;
818 int len;
819 int i;
820
821 offset = *(int *)pos & 0xffff;
822 len = *(int *)pos >> 16;
823
824 if (field)
825 offset += field->offset + sizeof(int);
826
827 if (offset + len > iter->ent_size) {
828 trace_seq_puts(&iter->seq, "<OVERFLOW>");
829 return;
830 }
831
832 pos = (void *)iter->ent + offset;
833
834 for (i = 0; i < len; i++, pos++) {
835 if (i)
836 trace_seq_putc(&iter->seq, ',');
837 trace_seq_printf(&iter->seq, "%02x", *(unsigned char *)pos);
838 }
839}
840
841static void print_fields(struct trace_iterator *iter, struct trace_event_call *call,
842 struct list_head *head)
843{
844 struct ftrace_event_field *field;
845 int offset;
846 int len;
847 int ret;
848 void *pos;
849
850 list_for_each_entry_reverse(field, head, link) {
851 trace_seq_printf(&iter->seq, " %s=", field->name);
852 if (field->offset + field->size > iter->ent_size) {
853 trace_seq_puts(&iter->seq, "<OVERFLOW>");
854 continue;
855 }
856 pos = (void *)iter->ent + field->offset;
857
858 switch (field->filter_type) {
859 case FILTER_COMM:
860 case FILTER_STATIC_STRING:
861 trace_seq_printf(&iter->seq, "%.*s", field->size, (char *)pos);
862 break;
863 case FILTER_RDYN_STRING:
864 case FILTER_DYN_STRING:
865 offset = *(int *)pos & 0xffff;
866 len = *(int *)pos >> 16;
867
868 if (field->filter_type == FILTER_RDYN_STRING)
869 offset += field->offset + sizeof(int);
870
871 if (offset + len > iter->ent_size) {
872 trace_seq_puts(&iter->seq, "<OVERFLOW>");
873 break;
874 }
875 pos = (void *)iter->ent + offset;
876 trace_seq_printf(&iter->seq, "%.*s", len, (char *)pos);
877 break;
878 case FILTER_PTR_STRING:
879 if (!iter->fmt_size)
880 trace_iter_expand_format(iter);
881 pos = *(void **)pos;
882 ret = strncpy_from_kernel_nofault(iter->fmt, pos,
883 iter->fmt_size);
884 if (ret < 0)
885 trace_seq_printf(&iter->seq, "(0x%px)", pos);
886 else
887 trace_seq_printf(&iter->seq, "(0x%px:%s)",
888 pos, iter->fmt);
889 break;
890 case FILTER_TRACE_FN:
891 pos = *(void **)pos;
892 trace_seq_printf(&iter->seq, "%pS", pos);
893 break;
894 case FILTER_CPU:
895 case FILTER_OTHER:
896 switch (field->size) {
897 case 1:
898 if (isprint(*(char *)pos)) {
899 trace_seq_printf(&iter->seq, "'%c'",
900 *(unsigned char *)pos);
901 }
902 trace_seq_printf(&iter->seq, "(%d)",
903 *(unsigned char *)pos);
904 break;
905 case 2:
906 trace_seq_printf(&iter->seq, "0x%x (%d)",
907 *(unsigned short *)pos,
908 *(unsigned short *)pos);
909 break;
910 case 4:
911 /* dynamic array info is 4 bytes */
912 if (strstr(field->type, "__data_loc")) {
913 print_array(iter, pos, NULL);
914 break;
915 }
916
917 if (strstr(field->type, "__rel_loc")) {
918 print_array(iter, pos, field);
919 break;
920 }
921
922 trace_seq_printf(&iter->seq, "0x%x (%d)",
923 *(unsigned int *)pos,
924 *(unsigned int *)pos);
925 break;
926 case 8:
927 trace_seq_printf(&iter->seq, "0x%llx (%lld)",
928 *(unsigned long long *)pos,
929 *(unsigned long long *)pos);
930 break;
931 default:
932 trace_seq_puts(&iter->seq, "<INVALID-SIZE>");
933 break;
934 }
935 break;
936 default:
937 trace_seq_puts(&iter->seq, "<INVALID-TYPE>");
938 }
939 }
940 trace_seq_putc(&iter->seq, '\n');
941}
942
943enum print_line_t print_event_fields(struct trace_iterator *iter,
944 struct trace_event *event)
945{
946 struct trace_event_call *call;
947 struct list_head *head;
948
949 /* ftrace defined events have separate call structures */
950 if (event->type <= __TRACE_LAST_TYPE) {
951 bool found = false;
952
953 down_read(&trace_event_sem);
954 list_for_each_entry(call, &ftrace_events, list) {
955 if (call->event.type == event->type) {
956 found = true;
957 break;
958 }
959 /* No need to search all events */
960 if (call->event.type > __TRACE_LAST_TYPE)
961 break;
962 }
963 up_read(&trace_event_sem);
964 if (!found) {
965 trace_seq_printf(&iter->seq, "UNKNOWN TYPE %d\n", event->type);
966 goto out;
967 }
968 } else {
969 call = container_of(event, struct trace_event_call, event);
970 }
971 head = trace_get_fields(call);
972
973 trace_seq_printf(&iter->seq, "%s:", trace_event_name(call));
974
975 if (head && !list_empty(head))
976 print_fields(iter, call, head);
977 else
978 trace_seq_puts(&iter->seq, "No fields found\n");
979
980 out:
981 return trace_handle_return(&iter->seq);
982}
983
984enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
985 struct trace_event *event)
986{
987 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
988
989 return trace_handle_return(&iter->seq);
990}
991
992static void print_fn_trace(struct trace_seq *s, unsigned long ip,
993 unsigned long parent_ip, int flags)
994{
995 seq_print_ip_sym(s, ip, flags);
996
997 if ((flags & TRACE_ITER_PRINT_PARENT) && parent_ip) {
998 trace_seq_puts(s, " <-");
999 seq_print_ip_sym(s, parent_ip, flags);
1000 }
1001}
1002
1003/* TRACE_FN */
1004static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
1005 struct trace_event *event)
1006{
1007 struct ftrace_entry *field;
1008 struct trace_seq *s = &iter->seq;
1009
1010 trace_assign_type(field, iter->ent);
1011
1012 print_fn_trace(s, field->ip, field->parent_ip, flags);
1013 trace_seq_putc(s, '\n');
1014
1015 return trace_handle_return(s);
1016}
1017
1018static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
1019 struct trace_event *event)
1020{
1021 struct ftrace_entry *field;
1022
1023 trace_assign_type(field, iter->ent);
1024
1025 trace_seq_printf(&iter->seq, "%lx %lx\n",
1026 field->ip,
1027 field->parent_ip);
1028
1029 return trace_handle_return(&iter->seq);
1030}
1031
1032static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
1033 struct trace_event *event)
1034{
1035 struct ftrace_entry *field;
1036 struct trace_seq *s = &iter->seq;
1037
1038 trace_assign_type(field, iter->ent);
1039
1040 SEQ_PUT_HEX_FIELD(s, field->ip);
1041 SEQ_PUT_HEX_FIELD(s, field->parent_ip);
1042
1043 return trace_handle_return(s);
1044}
1045
1046static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
1047 struct trace_event *event)
1048{
1049 struct ftrace_entry *field;
1050 struct trace_seq *s = &iter->seq;
1051
1052 trace_assign_type(field, iter->ent);
1053
1054 SEQ_PUT_FIELD(s, field->ip);
1055 SEQ_PUT_FIELD(s, field->parent_ip);
1056
1057 return trace_handle_return(s);
1058}
1059
1060static struct trace_event_functions trace_fn_funcs = {
1061 .trace = trace_fn_trace,
1062 .raw = trace_fn_raw,
1063 .hex = trace_fn_hex,
1064 .binary = trace_fn_bin,
1065};
1066
1067static struct trace_event trace_fn_event = {
1068 .type = TRACE_FN,
1069 .funcs = &trace_fn_funcs,
1070};
1071
1072/* TRACE_CTX an TRACE_WAKE */
1073static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
1074 char *delim)
1075{
1076 struct ctx_switch_entry *field;
1077 char comm[TASK_COMM_LEN];
1078 int S, T;
1079
1080
1081 trace_assign_type(field, iter->ent);
1082
1083 T = task_index_to_char(field->next_state);
1084 S = task_index_to_char(field->prev_state);
1085 trace_find_cmdline(field->next_pid, comm);
1086 trace_seq_printf(&iter->seq,
1087 " %7d:%3d:%c %s [%03d] %7d:%3d:%c %s\n",
1088 field->prev_pid,
1089 field->prev_prio,
1090 S, delim,
1091 field->next_cpu,
1092 field->next_pid,
1093 field->next_prio,
1094 T, comm);
1095
1096 return trace_handle_return(&iter->seq);
1097}
1098
1099static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
1100 struct trace_event *event)
1101{
1102 return trace_ctxwake_print(iter, "==>");
1103}
1104
1105static enum print_line_t trace_wake_print(struct trace_iterator *iter,
1106 int flags, struct trace_event *event)
1107{
1108 return trace_ctxwake_print(iter, " +");
1109}
1110
1111static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
1112{
1113 struct ctx_switch_entry *field;
1114 int T;
1115
1116 trace_assign_type(field, iter->ent);
1117
1118 if (!S)
1119 S = task_index_to_char(field->prev_state);
1120 T = task_index_to_char(field->next_state);
1121 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
1122 field->prev_pid,
1123 field->prev_prio,
1124 S,
1125 field->next_cpu,
1126 field->next_pid,
1127 field->next_prio,
1128 T);
1129
1130 return trace_handle_return(&iter->seq);
1131}
1132
1133static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
1134 struct trace_event *event)
1135{
1136 return trace_ctxwake_raw(iter, 0);
1137}
1138
1139static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
1140 struct trace_event *event)
1141{
1142 return trace_ctxwake_raw(iter, '+');
1143}
1144
1145
1146static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
1147{
1148 struct ctx_switch_entry *field;
1149 struct trace_seq *s = &iter->seq;
1150 int T;
1151
1152 trace_assign_type(field, iter->ent);
1153
1154 if (!S)
1155 S = task_index_to_char(field->prev_state);
1156 T = task_index_to_char(field->next_state);
1157
1158 SEQ_PUT_HEX_FIELD(s, field->prev_pid);
1159 SEQ_PUT_HEX_FIELD(s, field->prev_prio);
1160 SEQ_PUT_HEX_FIELD(s, S);
1161 SEQ_PUT_HEX_FIELD(s, field->next_cpu);
1162 SEQ_PUT_HEX_FIELD(s, field->next_pid);
1163 SEQ_PUT_HEX_FIELD(s, field->next_prio);
1164 SEQ_PUT_HEX_FIELD(s, T);
1165
1166 return trace_handle_return(s);
1167}
1168
1169static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1170 struct trace_event *event)
1171{
1172 return trace_ctxwake_hex(iter, 0);
1173}
1174
1175static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1176 struct trace_event *event)
1177{
1178 return trace_ctxwake_hex(iter, '+');
1179}
1180
1181static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1182 int flags, struct trace_event *event)
1183{
1184 struct ctx_switch_entry *field;
1185 struct trace_seq *s = &iter->seq;
1186
1187 trace_assign_type(field, iter->ent);
1188
1189 SEQ_PUT_FIELD(s, field->prev_pid);
1190 SEQ_PUT_FIELD(s, field->prev_prio);
1191 SEQ_PUT_FIELD(s, field->prev_state);
1192 SEQ_PUT_FIELD(s, field->next_cpu);
1193 SEQ_PUT_FIELD(s, field->next_pid);
1194 SEQ_PUT_FIELD(s, field->next_prio);
1195 SEQ_PUT_FIELD(s, field->next_state);
1196
1197 return trace_handle_return(s);
1198}
1199
1200static struct trace_event_functions trace_ctx_funcs = {
1201 .trace = trace_ctx_print,
1202 .raw = trace_ctx_raw,
1203 .hex = trace_ctx_hex,
1204 .binary = trace_ctxwake_bin,
1205};
1206
1207static struct trace_event trace_ctx_event = {
1208 .type = TRACE_CTX,
1209 .funcs = &trace_ctx_funcs,
1210};
1211
1212static struct trace_event_functions trace_wake_funcs = {
1213 .trace = trace_wake_print,
1214 .raw = trace_wake_raw,
1215 .hex = trace_wake_hex,
1216 .binary = trace_ctxwake_bin,
1217};
1218
1219static struct trace_event trace_wake_event = {
1220 .type = TRACE_WAKE,
1221 .funcs = &trace_wake_funcs,
1222};
1223
1224/* TRACE_STACK */
1225
1226static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1227 int flags, struct trace_event *event)
1228{
1229 struct stack_entry *field;
1230 struct trace_seq *s = &iter->seq;
1231 unsigned long *p;
1232 unsigned long *end;
1233
1234 trace_assign_type(field, iter->ent);
1235 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1236
1237 trace_seq_puts(s, "<stack trace>\n");
1238
1239 for (p = field->caller; p && p < end && *p != ULONG_MAX; p++) {
1240
1241 if (trace_seq_has_overflowed(s))
1242 break;
1243
1244 trace_seq_puts(s, " => ");
1245 seq_print_ip_sym(s, *p, flags);
1246 trace_seq_putc(s, '\n');
1247 }
1248
1249 return trace_handle_return(s);
1250}
1251
1252static struct trace_event_functions trace_stack_funcs = {
1253 .trace = trace_stack_print,
1254};
1255
1256static struct trace_event trace_stack_event = {
1257 .type = TRACE_STACK,
1258 .funcs = &trace_stack_funcs,
1259};
1260
1261/* TRACE_USER_STACK */
1262static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1263 int flags, struct trace_event *event)
1264{
1265 struct trace_array *tr = iter->tr;
1266 struct userstack_entry *field;
1267 struct trace_seq *s = &iter->seq;
1268 struct mm_struct *mm = NULL;
1269 unsigned int i;
1270
1271 trace_assign_type(field, iter->ent);
1272
1273 trace_seq_puts(s, "<user stack trace>\n");
1274
1275 if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
1276 struct task_struct *task;
1277 /*
1278 * we do the lookup on the thread group leader,
1279 * since individual threads might have already quit!
1280 */
1281 rcu_read_lock();
1282 task = find_task_by_vpid(field->tgid);
1283 if (task)
1284 mm = get_task_mm(task);
1285 rcu_read_unlock();
1286 }
1287
1288 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1289 unsigned long ip = field->caller[i];
1290
1291 if (!ip || trace_seq_has_overflowed(s))
1292 break;
1293
1294 trace_seq_puts(s, " => ");
1295 seq_print_user_ip(s, mm, ip, flags);
1296 trace_seq_putc(s, '\n');
1297 }
1298
1299 if (mm)
1300 mmput(mm);
1301
1302 return trace_handle_return(s);
1303}
1304
1305static struct trace_event_functions trace_user_stack_funcs = {
1306 .trace = trace_user_stack_print,
1307};
1308
1309static struct trace_event trace_user_stack_event = {
1310 .type = TRACE_USER_STACK,
1311 .funcs = &trace_user_stack_funcs,
1312};
1313
1314/* TRACE_HWLAT */
1315static enum print_line_t
1316trace_hwlat_print(struct trace_iterator *iter, int flags,
1317 struct trace_event *event)
1318{
1319 struct trace_entry *entry = iter->ent;
1320 struct trace_seq *s = &iter->seq;
1321 struct hwlat_entry *field;
1322
1323 trace_assign_type(field, entry);
1324
1325 trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld count:%d",
1326 field->seqnum,
1327 field->duration,
1328 field->outer_duration,
1329 (long long)field->timestamp.tv_sec,
1330 field->timestamp.tv_nsec, field->count);
1331
1332 if (field->nmi_count) {
1333 /*
1334 * The generic sched_clock() is not NMI safe, thus
1335 * we only record the count and not the time.
1336 */
1337 if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK))
1338 trace_seq_printf(s, " nmi-total:%llu",
1339 field->nmi_total_ts);
1340 trace_seq_printf(s, " nmi-count:%u",
1341 field->nmi_count);
1342 }
1343
1344 trace_seq_putc(s, '\n');
1345
1346 return trace_handle_return(s);
1347}
1348
1349static enum print_line_t
1350trace_hwlat_raw(struct trace_iterator *iter, int flags,
1351 struct trace_event *event)
1352{
1353 struct hwlat_entry *field;
1354 struct trace_seq *s = &iter->seq;
1355
1356 trace_assign_type(field, iter->ent);
1357
1358 trace_seq_printf(s, "%llu %lld %lld %09ld %u\n",
1359 field->duration,
1360 field->outer_duration,
1361 (long long)field->timestamp.tv_sec,
1362 field->timestamp.tv_nsec,
1363 field->seqnum);
1364
1365 return trace_handle_return(s);
1366}
1367
1368static struct trace_event_functions trace_hwlat_funcs = {
1369 .trace = trace_hwlat_print,
1370 .raw = trace_hwlat_raw,
1371};
1372
1373static struct trace_event trace_hwlat_event = {
1374 .type = TRACE_HWLAT,
1375 .funcs = &trace_hwlat_funcs,
1376};
1377
1378/* TRACE_OSNOISE */
1379static enum print_line_t
1380trace_osnoise_print(struct trace_iterator *iter, int flags,
1381 struct trace_event *event)
1382{
1383 struct trace_entry *entry = iter->ent;
1384 struct trace_seq *s = &iter->seq;
1385 struct osnoise_entry *field;
1386 u64 ratio, ratio_dec;
1387 u64 net_runtime;
1388
1389 trace_assign_type(field, entry);
1390
1391 /*
1392 * compute the available % of cpu time.
1393 */
1394 net_runtime = field->runtime - field->noise;
1395 ratio = net_runtime * 10000000;
1396 do_div(ratio, field->runtime);
1397 ratio_dec = do_div(ratio, 100000);
1398
1399 trace_seq_printf(s, "%llu %10llu %3llu.%05llu %7llu",
1400 field->runtime,
1401 field->noise,
1402 ratio, ratio_dec,
1403 field->max_sample);
1404
1405 trace_seq_printf(s, " %6u", field->hw_count);
1406 trace_seq_printf(s, " %6u", field->nmi_count);
1407 trace_seq_printf(s, " %6u", field->irq_count);
1408 trace_seq_printf(s, " %6u", field->softirq_count);
1409 trace_seq_printf(s, " %6u", field->thread_count);
1410
1411 trace_seq_putc(s, '\n');
1412
1413 return trace_handle_return(s);
1414}
1415
1416static enum print_line_t
1417trace_osnoise_raw(struct trace_iterator *iter, int flags,
1418 struct trace_event *event)
1419{
1420 struct osnoise_entry *field;
1421 struct trace_seq *s = &iter->seq;
1422
1423 trace_assign_type(field, iter->ent);
1424
1425 trace_seq_printf(s, "%lld %llu %llu %u %u %u %u %u\n",
1426 field->runtime,
1427 field->noise,
1428 field->max_sample,
1429 field->hw_count,
1430 field->nmi_count,
1431 field->irq_count,
1432 field->softirq_count,
1433 field->thread_count);
1434
1435 return trace_handle_return(s);
1436}
1437
1438static struct trace_event_functions trace_osnoise_funcs = {
1439 .trace = trace_osnoise_print,
1440 .raw = trace_osnoise_raw,
1441};
1442
1443static struct trace_event trace_osnoise_event = {
1444 .type = TRACE_OSNOISE,
1445 .funcs = &trace_osnoise_funcs,
1446};
1447
1448/* TRACE_TIMERLAT */
1449
1450static char *timerlat_lat_context[] = {"irq", "thread", "user-ret"};
1451static enum print_line_t
1452trace_timerlat_print(struct trace_iterator *iter, int flags,
1453 struct trace_event *event)
1454{
1455 struct trace_entry *entry = iter->ent;
1456 struct trace_seq *s = &iter->seq;
1457 struct timerlat_entry *field;
1458
1459 trace_assign_type(field, entry);
1460
1461 trace_seq_printf(s, "#%-5u context %6s timer_latency %9llu ns\n",
1462 field->seqnum,
1463 timerlat_lat_context[field->context],
1464 field->timer_latency);
1465
1466 return trace_handle_return(s);
1467}
1468
1469static enum print_line_t
1470trace_timerlat_raw(struct trace_iterator *iter, int flags,
1471 struct trace_event *event)
1472{
1473 struct timerlat_entry *field;
1474 struct trace_seq *s = &iter->seq;
1475
1476 trace_assign_type(field, iter->ent);
1477
1478 trace_seq_printf(s, "%u %d %llu\n",
1479 field->seqnum,
1480 field->context,
1481 field->timer_latency);
1482
1483 return trace_handle_return(s);
1484}
1485
1486static struct trace_event_functions trace_timerlat_funcs = {
1487 .trace = trace_timerlat_print,
1488 .raw = trace_timerlat_raw,
1489};
1490
1491static struct trace_event trace_timerlat_event = {
1492 .type = TRACE_TIMERLAT,
1493 .funcs = &trace_timerlat_funcs,
1494};
1495
1496/* TRACE_BPUTS */
1497static enum print_line_t
1498trace_bputs_print(struct trace_iterator *iter, int flags,
1499 struct trace_event *event)
1500{
1501 struct trace_entry *entry = iter->ent;
1502 struct trace_seq *s = &iter->seq;
1503 struct bputs_entry *field;
1504
1505 trace_assign_type(field, entry);
1506
1507 seq_print_ip_sym(s, field->ip, flags);
1508 trace_seq_puts(s, ": ");
1509 trace_seq_puts(s, field->str);
1510
1511 return trace_handle_return(s);
1512}
1513
1514
1515static enum print_line_t
1516trace_bputs_raw(struct trace_iterator *iter, int flags,
1517 struct trace_event *event)
1518{
1519 struct bputs_entry *field;
1520 struct trace_seq *s = &iter->seq;
1521
1522 trace_assign_type(field, iter->ent);
1523
1524 trace_seq_printf(s, ": %lx : ", field->ip);
1525 trace_seq_puts(s, field->str);
1526
1527 return trace_handle_return(s);
1528}
1529
1530static struct trace_event_functions trace_bputs_funcs = {
1531 .trace = trace_bputs_print,
1532 .raw = trace_bputs_raw,
1533};
1534
1535static struct trace_event trace_bputs_event = {
1536 .type = TRACE_BPUTS,
1537 .funcs = &trace_bputs_funcs,
1538};
1539
1540/* TRACE_BPRINT */
1541static enum print_line_t
1542trace_bprint_print(struct trace_iterator *iter, int flags,
1543 struct trace_event *event)
1544{
1545 struct trace_entry *entry = iter->ent;
1546 struct trace_seq *s = &iter->seq;
1547 struct bprint_entry *field;
1548
1549 trace_assign_type(field, entry);
1550
1551 seq_print_ip_sym(s, field->ip, flags);
1552 trace_seq_puts(s, ": ");
1553 trace_seq_bprintf(s, field->fmt, field->buf);
1554
1555 return trace_handle_return(s);
1556}
1557
1558
1559static enum print_line_t
1560trace_bprint_raw(struct trace_iterator *iter, int flags,
1561 struct trace_event *event)
1562{
1563 struct bprint_entry *field;
1564 struct trace_seq *s = &iter->seq;
1565
1566 trace_assign_type(field, iter->ent);
1567
1568 trace_seq_printf(s, ": %lx : ", field->ip);
1569 trace_seq_bprintf(s, field->fmt, field->buf);
1570
1571 return trace_handle_return(s);
1572}
1573
1574static struct trace_event_functions trace_bprint_funcs = {
1575 .trace = trace_bprint_print,
1576 .raw = trace_bprint_raw,
1577};
1578
1579static struct trace_event trace_bprint_event = {
1580 .type = TRACE_BPRINT,
1581 .funcs = &trace_bprint_funcs,
1582};
1583
1584/* TRACE_PRINT */
1585static enum print_line_t trace_print_print(struct trace_iterator *iter,
1586 int flags, struct trace_event *event)
1587{
1588 struct print_entry *field;
1589 struct trace_seq *s = &iter->seq;
1590
1591 trace_assign_type(field, iter->ent);
1592
1593 seq_print_ip_sym(s, field->ip, flags);
1594 trace_seq_printf(s, ": %s", field->buf);
1595
1596 return trace_handle_return(s);
1597}
1598
1599static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1600 struct trace_event *event)
1601{
1602 struct print_entry *field;
1603
1604 trace_assign_type(field, iter->ent);
1605
1606 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1607
1608 return trace_handle_return(&iter->seq);
1609}
1610
1611static struct trace_event_functions trace_print_funcs = {
1612 .trace = trace_print_print,
1613 .raw = trace_print_raw,
1614};
1615
1616static struct trace_event trace_print_event = {
1617 .type = TRACE_PRINT,
1618 .funcs = &trace_print_funcs,
1619};
1620
1621static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags,
1622 struct trace_event *event)
1623{
1624 struct raw_data_entry *field;
1625 int i;
1626
1627 trace_assign_type(field, iter->ent);
1628
1629 trace_seq_printf(&iter->seq, "# %x buf:", field->id);
1630
1631 for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++)
1632 trace_seq_printf(&iter->seq, " %02x",
1633 (unsigned char)field->buf[i]);
1634
1635 trace_seq_putc(&iter->seq, '\n');
1636
1637 return trace_handle_return(&iter->seq);
1638}
1639
1640static struct trace_event_functions trace_raw_data_funcs = {
1641 .trace = trace_raw_data,
1642 .raw = trace_raw_data,
1643};
1644
1645static struct trace_event trace_raw_data_event = {
1646 .type = TRACE_RAW_DATA,
1647 .funcs = &trace_raw_data_funcs,
1648};
1649
1650static enum print_line_t
1651trace_func_repeats_raw(struct trace_iterator *iter, int flags,
1652 struct trace_event *event)
1653{
1654 struct func_repeats_entry *field;
1655 struct trace_seq *s = &iter->seq;
1656
1657 trace_assign_type(field, iter->ent);
1658
1659 trace_seq_printf(s, "%lu %lu %u %llu\n",
1660 field->ip,
1661 field->parent_ip,
1662 field->count,
1663 FUNC_REPEATS_GET_DELTA_TS(field));
1664
1665 return trace_handle_return(s);
1666}
1667
1668static enum print_line_t
1669trace_func_repeats_print(struct trace_iterator *iter, int flags,
1670 struct trace_event *event)
1671{
1672 struct func_repeats_entry *field;
1673 struct trace_seq *s = &iter->seq;
1674
1675 trace_assign_type(field, iter->ent);
1676
1677 print_fn_trace(s, field->ip, field->parent_ip, flags);
1678 trace_seq_printf(s, " (repeats: %u, last_ts:", field->count);
1679 trace_print_time(s, iter,
1680 iter->ts - FUNC_REPEATS_GET_DELTA_TS(field));
1681 trace_seq_puts(s, ")\n");
1682
1683 return trace_handle_return(s);
1684}
1685
1686static struct trace_event_functions trace_func_repeats_funcs = {
1687 .trace = trace_func_repeats_print,
1688 .raw = trace_func_repeats_raw,
1689};
1690
1691static struct trace_event trace_func_repeats_event = {
1692 .type = TRACE_FUNC_REPEATS,
1693 .funcs = &trace_func_repeats_funcs,
1694};
1695
1696static struct trace_event *events[] __initdata = {
1697 &trace_fn_event,
1698 &trace_ctx_event,
1699 &trace_wake_event,
1700 &trace_stack_event,
1701 &trace_user_stack_event,
1702 &trace_bputs_event,
1703 &trace_bprint_event,
1704 &trace_print_event,
1705 &trace_hwlat_event,
1706 &trace_osnoise_event,
1707 &trace_timerlat_event,
1708 &trace_raw_data_event,
1709 &trace_func_repeats_event,
1710 NULL
1711};
1712
1713__init int init_events(void)
1714{
1715 struct trace_event *event;
1716 int i, ret;
1717
1718 for (i = 0; events[i]; i++) {
1719 event = events[i];
1720 ret = register_trace_event(event);
1721 WARN_ONCE(!ret, "event %d failed to register", event->type);
1722 }
1723
1724 return 0;
1725}