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add debugging code
[cor.git] / kernel / trace / trace_output.c
blobd9b4b7c22db4af5b28ba92364671ef163dfc8c8b
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
19 DECLARE_RWSEM(trace_event_sem);
20
21 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
22
23 static int next_event_type = __TRACE_LAST_TYPE + 1;
24
25 enum 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
38 enum 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
51 enum 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
64 const char *
65 trace_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 }
100 EXPORT_SYMBOL(trace_print_flags_seq);
101
102 const char *
103 trace_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 }
125 EXPORT_SYMBOL(trace_print_symbols_seq);
126
127 #if BITS_PER_LONG == 32
128 const char *
129 trace_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 }
164 EXPORT_SYMBOL(trace_print_flags_seq_u64);
165
166 const char *
167 trace_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 }
189 EXPORT_SYMBOL(trace_print_symbols_seq_u64);
190 #endif
191
192 const char *
193 trace_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 }
203 EXPORT_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 */
216 const char *
217 trace_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 }
230 EXPORT_SYMBOL(trace_print_hex_seq);
231
232 const char *
233 trace_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 }
275 EXPORT_SYMBOL(trace_print_array_seq);
276
277 const char *
278 trace_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 }
290 EXPORT_SYMBOL(trace_print_hex_dump_seq);
291
292 int 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 }
313 EXPORT_SYMBOL(trace_raw_output_prep);
314
315 static 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
326 int 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 }
337 EXPORT_SYMBOL_GPL(trace_output_call);
338
339 #ifdef CONFIG_KRETPROBES
340 static 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
350 static inline const char *kretprobed(const char *name)
351 {
352 return name;
353 }
354 #endif /* CONFIG_KRETPROBES */
355
356 static void
357 seq_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
383 static 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 down_read(&mm->mmap_sem);
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 up_read(&mm->mmap_sem);
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
415 int
416 seq_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 */
440 int 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
493 static int
494 lat_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-%-5d %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 */
509 static 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
522 char 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
535 static int
536 lat_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->trace_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
580 int 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-%-5d ", 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, "(%5d) ", 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
618 int trace_print_lat_context(struct trace_iterator *iter)
619 {
620 struct trace_array *tr = iter->tr;
621 /* trace_find_next_entry will reset ent_size */
622 int ent_size = iter->ent_size;
623 struct trace_seq *s = &iter->seq;
624 u64 next_ts;
625 struct trace_entry *entry = iter->ent,
626 *next_entry = trace_find_next_entry(iter, NULL,
627 &next_ts);
628 unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
629
630 /* Restore the original ent_size */
631 iter->ent_size = ent_size;
632
633 if (!next_entry)
634 next_ts = iter->ts;
635
636 if (verbose) {
637 char comm[TASK_COMM_LEN];
638
639 trace_find_cmdline(entry->pid, comm);
640
641 trace_seq_printf(
642 s, "%16s %5d %3d %d %08x %08lx ",
643 comm, entry->pid, iter->cpu, entry->flags,
644 entry->preempt_count, iter->idx);
645 } else {
646 lat_print_generic(s, entry, iter->cpu);
647 }
648
649 lat_print_timestamp(iter, next_ts);
650
651 return !trace_seq_has_overflowed(s);
652 }
653
654 /**
655 * ftrace_find_event - find a registered event
656 * @type: the type of event to look for
657 *
658 * Returns an event of type @type otherwise NULL
659 * Called with trace_event_read_lock() held.
660 */
661 struct trace_event *ftrace_find_event(int type)
662 {
663 struct trace_event *event;
664 unsigned key;
665
666 key = type & (EVENT_HASHSIZE - 1);
667
668 hlist_for_each_entry(event, &event_hash[key], node) {
669 if (event->type == type)
670 return event;
671 }
672
673 return NULL;
674 }
675
676 static LIST_HEAD(ftrace_event_list);
677
678 static int trace_search_list(struct list_head **list)
679 {
680 struct trace_event *e;
681 int last = __TRACE_LAST_TYPE;
682
683 if (list_empty(&ftrace_event_list)) {
684 *list = &ftrace_event_list;
685 return last + 1;
686 }
687
688 /*
689 * We used up all possible max events,
690 * lets see if somebody freed one.
691 */
692 list_for_each_entry(e, &ftrace_event_list, list) {
693 if (e->type != last + 1)
694 break;
695 last++;
696 }
697
698 /* Did we used up all 65 thousand events??? */
699 if ((last + 1) > TRACE_EVENT_TYPE_MAX)
700 return 0;
701
702 *list = &e->list;
703 return last + 1;
704 }
705
706 void trace_event_read_lock(void)
707 {
708 down_read(&trace_event_sem);
709 }
710
711 void trace_event_read_unlock(void)
712 {
713 up_read(&trace_event_sem);
714 }
715
716 /**
717 * register_trace_event - register output for an event type
718 * @event: the event type to register
719 *
720 * Event types are stored in a hash and this hash is used to
721 * find a way to print an event. If the @event->type is set
722 * then it will use that type, otherwise it will assign a
723 * type to use.
724 *
725 * If you assign your own type, please make sure it is added
726 * to the trace_type enum in trace.h, to avoid collisions
727 * with the dynamic types.
728 *
729 * Returns the event type number or zero on error.
730 */
731 int register_trace_event(struct trace_event *event)
732 {
733 unsigned key;
734 int ret = 0;
735
736 down_write(&trace_event_sem);
737
738 if (WARN_ON(!event))
739 goto out;
740
741 if (WARN_ON(!event->funcs))
742 goto out;
743
744 INIT_LIST_HEAD(&event->list);
745
746 if (!event->type) {
747 struct list_head *list = NULL;
748
749 if (next_event_type > TRACE_EVENT_TYPE_MAX) {
750
751 event->type = trace_search_list(&list);
752 if (!event->type)
753 goto out;
754
755 } else {
756
757 event->type = next_event_type++;
758 list = &ftrace_event_list;
759 }
760
761 if (WARN_ON(ftrace_find_event(event->type)))
762 goto out;
763
764 list_add_tail(&event->list, list);
765
766 } else if (event->type > __TRACE_LAST_TYPE) {
767 printk(KERN_WARNING "Need to add type to trace.h\n");
768 WARN_ON(1);
769 goto out;
770 } else {
771 /* Is this event already used */
772 if (ftrace_find_event(event->type))
773 goto out;
774 }
775
776 if (event->funcs->trace == NULL)
777 event->funcs->trace = trace_nop_print;
778 if (event->funcs->raw == NULL)
779 event->funcs->raw = trace_nop_print;
780 if (event->funcs->hex == NULL)
781 event->funcs->hex = trace_nop_print;
782 if (event->funcs->binary == NULL)
783 event->funcs->binary = trace_nop_print;
784
785 key = event->type & (EVENT_HASHSIZE - 1);
786
787 hlist_add_head(&event->node, &event_hash[key]);
788
789 ret = event->type;
790 out:
791 up_write(&trace_event_sem);
792
793 return ret;
794 }
795 EXPORT_SYMBOL_GPL(register_trace_event);
796
797 /*
798 * Used by module code with the trace_event_sem held for write.
799 */
800 int __unregister_trace_event(struct trace_event *event)
801 {
802 hlist_del(&event->node);
803 list_del(&event->list);
804 return 0;
805 }
806
807 /**
808 * unregister_trace_event - remove a no longer used event
809 * @event: the event to remove
810 */
811 int unregister_trace_event(struct trace_event *event)
812 {
813 down_write(&trace_event_sem);
814 __unregister_trace_event(event);
815 up_write(&trace_event_sem);
816
817 return 0;
818 }
819 EXPORT_SYMBOL_GPL(unregister_trace_event);
820
821 /*
822 * Standard events
823 */
824
825 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
826 struct trace_event *event)
827 {
828 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
829
830 return trace_handle_return(&iter->seq);
831 }
832
833 /* TRACE_FN */
834 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
835 struct trace_event *event)
836 {
837 struct ftrace_entry *field;
838 struct trace_seq *s = &iter->seq;
839
840 trace_assign_type(field, iter->ent);
841
842 seq_print_ip_sym(s, field->ip, flags);
843
844 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
845 trace_seq_puts(s, " <-");
846 seq_print_ip_sym(s, field->parent_ip, flags);
847 }
848
849 trace_seq_putc(s, '\n');
850
851 return trace_handle_return(s);
852 }
853
854 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
855 struct trace_event *event)
856 {
857 struct ftrace_entry *field;
858
859 trace_assign_type(field, iter->ent);
860
861 trace_seq_printf(&iter->seq, "%lx %lx\n",
862 field->ip,
863 field->parent_ip);
864
865 return trace_handle_return(&iter->seq);
866 }
867
868 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
869 struct trace_event *event)
870 {
871 struct ftrace_entry *field;
872 struct trace_seq *s = &iter->seq;
873
874 trace_assign_type(field, iter->ent);
875
876 SEQ_PUT_HEX_FIELD(s, field->ip);
877 SEQ_PUT_HEX_FIELD(s, field->parent_ip);
878
879 return trace_handle_return(s);
880 }
881
882 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
883 struct trace_event *event)
884 {
885 struct ftrace_entry *field;
886 struct trace_seq *s = &iter->seq;
887
888 trace_assign_type(field, iter->ent);
889
890 SEQ_PUT_FIELD(s, field->ip);
891 SEQ_PUT_FIELD(s, field->parent_ip);
892
893 return trace_handle_return(s);
894 }
895
896 static struct trace_event_functions trace_fn_funcs = {
897 .trace = trace_fn_trace,
898 .raw = trace_fn_raw,
899 .hex = trace_fn_hex,
900 .binary = trace_fn_bin,
901 };
902
903 static struct trace_event trace_fn_event = {
904 .type = TRACE_FN,
905 .funcs = &trace_fn_funcs,
906 };
907
908 /* TRACE_CTX an TRACE_WAKE */
909 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
910 char *delim)
911 {
912 struct ctx_switch_entry *field;
913 char comm[TASK_COMM_LEN];
914 int S, T;
915
916
917 trace_assign_type(field, iter->ent);
918
919 T = task_index_to_char(field->next_state);
920 S = task_index_to_char(field->prev_state);
921 trace_find_cmdline(field->next_pid, comm);
922 trace_seq_printf(&iter->seq,
923 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
924 field->prev_pid,
925 field->prev_prio,
926 S, delim,
927 field->next_cpu,
928 field->next_pid,
929 field->next_prio,
930 T, comm);
931
932 return trace_handle_return(&iter->seq);
933 }
934
935 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
936 struct trace_event *event)
937 {
938 return trace_ctxwake_print(iter, "==>");
939 }
940
941 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
942 int flags, struct trace_event *event)
943 {
944 return trace_ctxwake_print(iter, " +");
945 }
946
947 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
948 {
949 struct ctx_switch_entry *field;
950 int T;
951
952 trace_assign_type(field, iter->ent);
953
954 if (!S)
955 S = task_index_to_char(field->prev_state);
956 T = task_index_to_char(field->next_state);
957 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
958 field->prev_pid,
959 field->prev_prio,
960 S,
961 field->next_cpu,
962 field->next_pid,
963 field->next_prio,
964 T);
965
966 return trace_handle_return(&iter->seq);
967 }
968
969 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
970 struct trace_event *event)
971 {
972 return trace_ctxwake_raw(iter, 0);
973 }
974
975 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
976 struct trace_event *event)
977 {
978 return trace_ctxwake_raw(iter, '+');
979 }
980
981
982 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
983 {
984 struct ctx_switch_entry *field;
985 struct trace_seq *s = &iter->seq;
986 int T;
987
988 trace_assign_type(field, iter->ent);
989
990 if (!S)
991 S = task_index_to_char(field->prev_state);
992 T = task_index_to_char(field->next_state);
993
994 SEQ_PUT_HEX_FIELD(s, field->prev_pid);
995 SEQ_PUT_HEX_FIELD(s, field->prev_prio);
996 SEQ_PUT_HEX_FIELD(s, S);
997 SEQ_PUT_HEX_FIELD(s, field->next_cpu);
998 SEQ_PUT_HEX_FIELD(s, field->next_pid);
999 SEQ_PUT_HEX_FIELD(s, field->next_prio);
1000 SEQ_PUT_HEX_FIELD(s, T);
1001
1002 return trace_handle_return(s);
1003 }
1004
1005 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1006 struct trace_event *event)
1007 {
1008 return trace_ctxwake_hex(iter, 0);
1009 }
1010
1011 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1012 struct trace_event *event)
1013 {
1014 return trace_ctxwake_hex(iter, '+');
1015 }
1016
1017 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1018 int flags, struct trace_event *event)
1019 {
1020 struct ctx_switch_entry *field;
1021 struct trace_seq *s = &iter->seq;
1022
1023 trace_assign_type(field, iter->ent);
1024
1025 SEQ_PUT_FIELD(s, field->prev_pid);
1026 SEQ_PUT_FIELD(s, field->prev_prio);
1027 SEQ_PUT_FIELD(s, field->prev_state);
1028 SEQ_PUT_FIELD(s, field->next_cpu);
1029 SEQ_PUT_FIELD(s, field->next_pid);
1030 SEQ_PUT_FIELD(s, field->next_prio);
1031 SEQ_PUT_FIELD(s, field->next_state);
1032
1033 return trace_handle_return(s);
1034 }
1035
1036 static struct trace_event_functions trace_ctx_funcs = {
1037 .trace = trace_ctx_print,
1038 .raw = trace_ctx_raw,
1039 .hex = trace_ctx_hex,
1040 .binary = trace_ctxwake_bin,
1041 };
1042
1043 static struct trace_event trace_ctx_event = {
1044 .type = TRACE_CTX,
1045 .funcs = &trace_ctx_funcs,
1046 };
1047
1048 static struct trace_event_functions trace_wake_funcs = {
1049 .trace = trace_wake_print,
1050 .raw = trace_wake_raw,
1051 .hex = trace_wake_hex,
1052 .binary = trace_ctxwake_bin,
1053 };
1054
1055 static struct trace_event trace_wake_event = {
1056 .type = TRACE_WAKE,
1057 .funcs = &trace_wake_funcs,
1058 };
1059
1060 /* TRACE_STACK */
1061
1062 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1063 int flags, struct trace_event *event)
1064 {
1065 struct stack_entry *field;
1066 struct trace_seq *s = &iter->seq;
1067 unsigned long *p;
1068 unsigned long *end;
1069
1070 trace_assign_type(field, iter->ent);
1071 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1072
1073 trace_seq_puts(s, "<stack trace>\n");
1074
1075 for (p = field->caller; p && p < end && *p != ULONG_MAX; p++) {
1076
1077 if (trace_seq_has_overflowed(s))
1078 break;
1079
1080 trace_seq_puts(s, " => ");
1081 seq_print_ip_sym(s, *p, flags);
1082 trace_seq_putc(s, '\n');
1083 }
1084
1085 return trace_handle_return(s);
1086 }
1087
1088 static struct trace_event_functions trace_stack_funcs = {
1089 .trace = trace_stack_print,
1090 };
1091
1092 static struct trace_event trace_stack_event = {
1093 .type = TRACE_STACK,
1094 .funcs = &trace_stack_funcs,
1095 };
1096
1097 /* TRACE_USER_STACK */
1098 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1099 int flags, struct trace_event *event)
1100 {
1101 struct trace_array *tr = iter->tr;
1102 struct userstack_entry *field;
1103 struct trace_seq *s = &iter->seq;
1104 struct mm_struct *mm = NULL;
1105 unsigned int i;
1106
1107 trace_assign_type(field, iter->ent);
1108
1109 trace_seq_puts(s, "<user stack trace>\n");
1110
1111 if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
1112 struct task_struct *task;
1113 /*
1114 * we do the lookup on the thread group leader,
1115 * since individual threads might have already quit!
1116 */
1117 rcu_read_lock();
1118 task = find_task_by_vpid(field->tgid);
1119 if (task)
1120 mm = get_task_mm(task);
1121 rcu_read_unlock();
1122 }
1123
1124 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1125 unsigned long ip = field->caller[i];
1126
1127 if (!ip || trace_seq_has_overflowed(s))
1128 break;
1129
1130 trace_seq_puts(s, " => ");
1131 seq_print_user_ip(s, mm, ip, flags);
1132 trace_seq_putc(s, '\n');
1133 }
1134
1135 if (mm)
1136 mmput(mm);
1137
1138 return trace_handle_return(s);
1139 }
1140
1141 static struct trace_event_functions trace_user_stack_funcs = {
1142 .trace = trace_user_stack_print,
1143 };
1144
1145 static struct trace_event trace_user_stack_event = {
1146 .type = TRACE_USER_STACK,
1147 .funcs = &trace_user_stack_funcs,
1148 };
1149
1150 /* TRACE_HWLAT */
1151 static enum print_line_t
1152 trace_hwlat_print(struct trace_iterator *iter, int flags,
1153 struct trace_event *event)
1154 {
1155 struct trace_entry *entry = iter->ent;
1156 struct trace_seq *s = &iter->seq;
1157 struct hwlat_entry *field;
1158
1159 trace_assign_type(field, entry);
1160
1161 trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld",
1162 field->seqnum,
1163 field->duration,
1164 field->outer_duration,
1165 (long long)field->timestamp.tv_sec,
1166 field->timestamp.tv_nsec);
1167
1168 if (field->nmi_count) {
1169 /*
1170 * The generic sched_clock() is not NMI safe, thus
1171 * we only record the count and not the time.
1172 */
1173 if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK))
1174 trace_seq_printf(s, " nmi-total:%llu",
1175 field->nmi_total_ts);
1176 trace_seq_printf(s, " nmi-count:%u",
1177 field->nmi_count);
1178 }
1179
1180 trace_seq_putc(s, '\n');
1181
1182 return trace_handle_return(s);
1183 }
1184
1185
1186 static enum print_line_t
1187 trace_hwlat_raw(struct trace_iterator *iter, int flags,
1188 struct trace_event *event)
1189 {
1190 struct hwlat_entry *field;
1191 struct trace_seq *s = &iter->seq;
1192
1193 trace_assign_type(field, iter->ent);
1194
1195 trace_seq_printf(s, "%llu %lld %lld %09ld %u\n",
1196 field->duration,
1197 field->outer_duration,
1198 (long long)field->timestamp.tv_sec,
1199 field->timestamp.tv_nsec,
1200 field->seqnum);
1201
1202 return trace_handle_return(s);
1203 }
1204
1205 static struct trace_event_functions trace_hwlat_funcs = {
1206 .trace = trace_hwlat_print,
1207 .raw = trace_hwlat_raw,
1208 };
1209
1210 static struct trace_event trace_hwlat_event = {
1211 .type = TRACE_HWLAT,
1212 .funcs = &trace_hwlat_funcs,
1213 };
1214
1215 /* TRACE_BPUTS */
1216 static enum print_line_t
1217 trace_bputs_print(struct trace_iterator *iter, int flags,
1218 struct trace_event *event)
1219 {
1220 struct trace_entry *entry = iter->ent;
1221 struct trace_seq *s = &iter->seq;
1222 struct bputs_entry *field;
1223
1224 trace_assign_type(field, entry);
1225
1226 seq_print_ip_sym(s, field->ip, flags);
1227 trace_seq_puts(s, ": ");
1228 trace_seq_puts(s, field->str);
1229
1230 return trace_handle_return(s);
1231 }
1232
1233
1234 static enum print_line_t
1235 trace_bputs_raw(struct trace_iterator *iter, int flags,
1236 struct trace_event *event)
1237 {
1238 struct bputs_entry *field;
1239 struct trace_seq *s = &iter->seq;
1240
1241 trace_assign_type(field, iter->ent);
1242
1243 trace_seq_printf(s, ": %lx : ", field->ip);
1244 trace_seq_puts(s, field->str);
1245
1246 return trace_handle_return(s);
1247 }
1248
1249 static struct trace_event_functions trace_bputs_funcs = {
1250 .trace = trace_bputs_print,
1251 .raw = trace_bputs_raw,
1252 };
1253
1254 static struct trace_event trace_bputs_event = {
1255 .type = TRACE_BPUTS,
1256 .funcs = &trace_bputs_funcs,
1257 };
1258
1259 /* TRACE_BPRINT */
1260 static enum print_line_t
1261 trace_bprint_print(struct trace_iterator *iter, int flags,
1262 struct trace_event *event)
1263 {
1264 struct trace_entry *entry = iter->ent;
1265 struct trace_seq *s = &iter->seq;
1266 struct bprint_entry *field;
1267
1268 trace_assign_type(field, entry);
1269
1270 seq_print_ip_sym(s, field->ip, flags);
1271 trace_seq_puts(s, ": ");
1272 trace_seq_bprintf(s, field->fmt, field->buf);
1273
1274 return trace_handle_return(s);
1275 }
1276
1277
1278 static enum print_line_t
1279 trace_bprint_raw(struct trace_iterator *iter, int flags,
1280 struct trace_event *event)
1281 {
1282 struct bprint_entry *field;
1283 struct trace_seq *s = &iter->seq;
1284
1285 trace_assign_type(field, iter->ent);
1286
1287 trace_seq_printf(s, ": %lx : ", field->ip);
1288 trace_seq_bprintf(s, field->fmt, field->buf);
1289
1290 return trace_handle_return(s);
1291 }
1292
1293 static struct trace_event_functions trace_bprint_funcs = {
1294 .trace = trace_bprint_print,
1295 .raw = trace_bprint_raw,
1296 };
1297
1298 static struct trace_event trace_bprint_event = {
1299 .type = TRACE_BPRINT,
1300 .funcs = &trace_bprint_funcs,
1301 };
1302
1303 /* TRACE_PRINT */
1304 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1305 int flags, struct trace_event *event)
1306 {
1307 struct print_entry *field;
1308 struct trace_seq *s = &iter->seq;
1309
1310 trace_assign_type(field, iter->ent);
1311
1312 seq_print_ip_sym(s, field->ip, flags);
1313 trace_seq_printf(s, ": %s", field->buf);
1314
1315 return trace_handle_return(s);
1316 }
1317
1318 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1319 struct trace_event *event)
1320 {
1321 struct print_entry *field;
1322
1323 trace_assign_type(field, iter->ent);
1324
1325 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1326
1327 return trace_handle_return(&iter->seq);
1328 }
1329
1330 static struct trace_event_functions trace_print_funcs = {
1331 .trace = trace_print_print,
1332 .raw = trace_print_raw,
1333 };
1334
1335 static struct trace_event trace_print_event = {
1336 .type = TRACE_PRINT,
1337 .funcs = &trace_print_funcs,
1338 };
1339
1340 static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags,
1341 struct trace_event *event)
1342 {
1343 struct raw_data_entry *field;
1344 int i;
1345
1346 trace_assign_type(field, iter->ent);
1347
1348 trace_seq_printf(&iter->seq, "# %x buf:", field->id);
1349
1350 for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++)
1351 trace_seq_printf(&iter->seq, " %02x",
1352 (unsigned char)field->buf[i]);
1353
1354 trace_seq_putc(&iter->seq, '\n');
1355
1356 return trace_handle_return(&iter->seq);
1357 }
1358
1359 static struct trace_event_functions trace_raw_data_funcs = {
1360 .trace = trace_raw_data,
1361 .raw = trace_raw_data,
1362 };
1363
1364 static struct trace_event trace_raw_data_event = {
1365 .type = TRACE_RAW_DATA,
1366 .funcs = &trace_raw_data_funcs,
1367 };
1368
1369
1370 static struct trace_event *events[] __initdata = {
1371 &trace_fn_event,
1372 &trace_ctx_event,
1373 &trace_wake_event,
1374 &trace_stack_event,
1375 &trace_user_stack_event,
1376 &trace_bputs_event,
1377 &trace_bprint_event,
1378 &trace_print_event,
1379 &trace_hwlat_event,
1380 &trace_raw_data_event,
1381 NULL
1382 };
1383
1384 __init static int init_events(void)
1385 {
1386 struct trace_event *event;
1387 int i, ret;
1388
1389 for (i = 0; events[i]; i++) {
1390 event = events[i];
1391
1392 ret = register_trace_event(event);
1393 if (!ret) {
1394 printk(KERN_WARNING "event %d failed to register\n",
1395 event->type);
1396 WARN_ON_ONCE(1);
1397 }
1398 }
1399
1400 return 0;
1401 }
1402 early_initcall(init_events);
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