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KVM: PPC: Book3S HV: Enable migration of decrementer register
[linux/fpc-iii.git] / kernel / trace / trace_output.c
blob90db994ac9004d2fc7163eeb95b8c79e121e991a
1 /*
2 * trace_output.c
3 *
4 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
5 *
6 */
7 #include <linux/module.h>
8 #include <linux/mutex.h>
9 #include <linux/ftrace.h>
10 #include <linux/sched/clock.h>
11 #include <linux/sched/mm.h>
12
13 #include "trace_output.h"
14
15 /* must be a power of 2 */
16 #define EVENT_HASHSIZE 128
17
18 DECLARE_RWSEM(trace_event_sem);
19
20 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
21
22 static int next_event_type = __TRACE_LAST_TYPE + 1;
23
24 enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
25 {
26 struct trace_seq *s = &iter->seq;
27 struct trace_entry *entry = iter->ent;
28 struct bputs_entry *field;
29
30 trace_assign_type(field, entry);
31
32 trace_seq_puts(s, field->str);
33
34 return trace_handle_return(s);
35 }
36
37 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
38 {
39 struct trace_seq *s = &iter->seq;
40 struct trace_entry *entry = iter->ent;
41 struct bprint_entry *field;
42
43 trace_assign_type(field, entry);
44
45 trace_seq_bprintf(s, field->fmt, field->buf);
46
47 return trace_handle_return(s);
48 }
49
50 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
51 {
52 struct trace_seq *s = &iter->seq;
53 struct trace_entry *entry = iter->ent;
54 struct print_entry *field;
55
56 trace_assign_type(field, entry);
57
58 trace_seq_puts(s, field->buf);
59
60 return trace_handle_return(s);
61 }
62
63 const char *
64 trace_print_flags_seq(struct trace_seq *p, const char *delim,
65 unsigned long flags,
66 const struct trace_print_flags *flag_array)
67 {
68 unsigned long mask;
69 const char *str;
70 const char *ret = trace_seq_buffer_ptr(p);
71 int i, first = 1;
72
73 for (i = 0; flag_array[i].name && flags; i++) {
74
75 mask = flag_array[i].mask;
76 if ((flags & mask) != mask)
77 continue;
78
79 str = flag_array[i].name;
80 flags &= ~mask;
81 if (!first && delim)
82 trace_seq_puts(p, delim);
83 else
84 first = 0;
85 trace_seq_puts(p, str);
86 }
87
88 /* check for left over flags */
89 if (flags) {
90 if (!first && delim)
91 trace_seq_puts(p, delim);
92 trace_seq_printf(p, "0x%lx", flags);
93 }
94
95 trace_seq_putc(p, 0);
96
97 return ret;
98 }
99 EXPORT_SYMBOL(trace_print_flags_seq);
100
101 const char *
102 trace_print_symbols_seq(struct trace_seq *p, unsigned long val,
103 const struct trace_print_flags *symbol_array)
104 {
105 int i;
106 const char *ret = trace_seq_buffer_ptr(p);
107
108 for (i = 0; symbol_array[i].name; i++) {
109
110 if (val != symbol_array[i].mask)
111 continue;
112
113 trace_seq_puts(p, symbol_array[i].name);
114 break;
115 }
116
117 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
118 trace_seq_printf(p, "0x%lx", val);
119
120 trace_seq_putc(p, 0);
121
122 return ret;
123 }
124 EXPORT_SYMBOL(trace_print_symbols_seq);
125
126 #if BITS_PER_LONG == 32
127 const char *
128 trace_print_flags_seq_u64(struct trace_seq *p, const char *delim,
129 unsigned long long flags,
130 const struct trace_print_flags_u64 *flag_array)
131 {
132 unsigned long long mask;
133 const char *str;
134 const char *ret = trace_seq_buffer_ptr(p);
135 int i, first = 1;
136
137 for (i = 0; flag_array[i].name && flags; i++) {
138
139 mask = flag_array[i].mask;
140 if ((flags & mask) != mask)
141 continue;
142
143 str = flag_array[i].name;
144 flags &= ~mask;
145 if (!first && delim)
146 trace_seq_puts(p, delim);
147 else
148 first = 0;
149 trace_seq_puts(p, str);
150 }
151
152 /* check for left over flags */
153 if (flags) {
154 if (!first && delim)
155 trace_seq_puts(p, delim);
156 trace_seq_printf(p, "0x%llx", flags);
157 }
158
159 trace_seq_putc(p, 0);
160
161 return ret;
162 }
163 EXPORT_SYMBOL(trace_print_flags_seq_u64);
164
165 const char *
166 trace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
167 const struct trace_print_flags_u64 *symbol_array)
168 {
169 int i;
170 const char *ret = trace_seq_buffer_ptr(p);
171
172 for (i = 0; symbol_array[i].name; i++) {
173
174 if (val != symbol_array[i].mask)
175 continue;
176
177 trace_seq_puts(p, symbol_array[i].name);
178 break;
179 }
180
181 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
182 trace_seq_printf(p, "0x%llx", val);
183
184 trace_seq_putc(p, 0);
185
186 return ret;
187 }
188 EXPORT_SYMBOL(trace_print_symbols_seq_u64);
189 #endif
190
191 const char *
192 trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
193 unsigned int bitmask_size)
194 {
195 const char *ret = trace_seq_buffer_ptr(p);
196
197 trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8);
198 trace_seq_putc(p, 0);
199
200 return ret;
201 }
202 EXPORT_SYMBOL_GPL(trace_print_bitmask_seq);
203
204 /**
205 * trace_print_hex_seq - print buffer as hex sequence
206 * @p: trace seq struct to write to
207 * @buf: The buffer to print
208 * @buf_len: Length of @buf in bytes
209 * @concatenate: Print @buf as single hex string or with spacing
210 *
211 * Prints the passed buffer as a hex sequence either as a whole,
212 * single hex string if @concatenate is true or with spacing after
213 * each byte in case @concatenate is false.
214 */
215 const char *
216 trace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len,
217 bool concatenate)
218 {
219 int i;
220 const char *ret = trace_seq_buffer_ptr(p);
221
222 for (i = 0; i < buf_len; i++)
223 trace_seq_printf(p, "%s%2.2x", concatenate || i == 0 ? "" : " ",
224 buf[i]);
225 trace_seq_putc(p, 0);
226
227 return ret;
228 }
229 EXPORT_SYMBOL(trace_print_hex_seq);
230
231 const char *
232 trace_print_array_seq(struct trace_seq *p, const void *buf, int count,
233 size_t el_size)
234 {
235 const char *ret = trace_seq_buffer_ptr(p);
236 const char *prefix = "";
237 void *ptr = (void *)buf;
238 size_t buf_len = count * el_size;
239
240 trace_seq_putc(p, '{');
241
242 while (ptr < buf + buf_len) {
243 switch (el_size) {
244 case 1:
245 trace_seq_printf(p, "%s0x%x", prefix,
246 *(u8 *)ptr);
247 break;
248 case 2:
249 trace_seq_printf(p, "%s0x%x", prefix,
250 *(u16 *)ptr);
251 break;
252 case 4:
253 trace_seq_printf(p, "%s0x%x", prefix,
254 *(u32 *)ptr);
255 break;
256 case 8:
257 trace_seq_printf(p, "%s0x%llx", prefix,
258 *(u64 *)ptr);
259 break;
260 default:
261 trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
262 *(u8 *)ptr);
263 el_size = 1;
264 }
265 prefix = ",";
266 ptr += el_size;
267 }
268
269 trace_seq_putc(p, '}');
270 trace_seq_putc(p, 0);
271
272 return ret;
273 }
274 EXPORT_SYMBOL(trace_print_array_seq);
275
276 int trace_raw_output_prep(struct trace_iterator *iter,
277 struct trace_event *trace_event)
278 {
279 struct trace_event_call *event;
280 struct trace_seq *s = &iter->seq;
281 struct trace_seq *p = &iter->tmp_seq;
282 struct trace_entry *entry;
283
284 event = container_of(trace_event, struct trace_event_call, event);
285 entry = iter->ent;
286
287 if (entry->type != event->event.type) {
288 WARN_ON_ONCE(1);
289 return TRACE_TYPE_UNHANDLED;
290 }
291
292 trace_seq_init(p);
293 trace_seq_printf(s, "%s: ", trace_event_name(event));
294
295 return trace_handle_return(s);
296 }
297 EXPORT_SYMBOL(trace_raw_output_prep);
298
299 static int trace_output_raw(struct trace_iterator *iter, char *name,
300 char *fmt, va_list ap)
301 {
302 struct trace_seq *s = &iter->seq;
303
304 trace_seq_printf(s, "%s: ", name);
305 trace_seq_vprintf(s, fmt, ap);
306
307 return trace_handle_return(s);
308 }
309
310 int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
311 {
312 va_list ap;
313 int ret;
314
315 va_start(ap, fmt);
316 ret = trace_output_raw(iter, name, fmt, ap);
317 va_end(ap);
318
319 return ret;
320 }
321 EXPORT_SYMBOL_GPL(trace_output_call);
322
323 #ifdef CONFIG_KRETPROBES
324 static inline const char *kretprobed(const char *name)
325 {
326 static const char tramp_name[] = "kretprobe_trampoline";
327 int size = sizeof(tramp_name);
328
329 if (strncmp(tramp_name, name, size) == 0)
330 return "[unknown/kretprobe'd]";
331 return name;
332 }
333 #else
334 static inline const char *kretprobed(const char *name)
335 {
336 return name;
337 }
338 #endif /* CONFIG_KRETPROBES */
339
340 static void
341 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
342 {
343 char str[KSYM_SYMBOL_LEN];
344 #ifdef CONFIG_KALLSYMS
345 const char *name;
346
347 kallsyms_lookup(address, NULL, NULL, NULL, str);
348
349 name = kretprobed(str);
350
351 if (name && strlen(name)) {
352 trace_seq_printf(s, fmt, name);
353 return;
354 }
355 #endif
356 snprintf(str, KSYM_SYMBOL_LEN, "0x%08lx", address);
357 trace_seq_printf(s, fmt, str);
358 }
359
360 static void
361 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
362 unsigned long address)
363 {
364 char str[KSYM_SYMBOL_LEN];
365 #ifdef CONFIG_KALLSYMS
366 const char *name;
367
368 sprint_symbol(str, address);
369 name = kretprobed(str);
370
371 if (name && strlen(name)) {
372 trace_seq_printf(s, fmt, name);
373 return;
374 }
375 #endif
376 snprintf(str, KSYM_SYMBOL_LEN, "0x%08lx", address);
377 trace_seq_printf(s, fmt, str);
378 }
379
380 #ifndef CONFIG_64BIT
381 # define IP_FMT "%08lx"
382 #else
383 # define IP_FMT "%016lx"
384 #endif
385
386 static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
387 unsigned long ip, unsigned long sym_flags)
388 {
389 struct file *file = NULL;
390 unsigned long vmstart = 0;
391 int ret = 1;
392
393 if (s->full)
394 return 0;
395
396 if (mm) {
397 const struct vm_area_struct *vma;
398
399 down_read(&mm->mmap_sem);
400 vma = find_vma(mm, ip);
401 if (vma) {
402 file = vma->vm_file;
403 vmstart = vma->vm_start;
404 }
405 if (file) {
406 ret = trace_seq_path(s, &file->f_path);
407 if (ret)
408 trace_seq_printf(s, "[+0x%lx]",
409 ip - vmstart);
410 }
411 up_read(&mm->mmap_sem);
412 }
413 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
414 trace_seq_printf(s, " <" IP_FMT ">", ip);
415 return !trace_seq_has_overflowed(s);
416 }
417
418 int
419 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
420 {
421 if (!ip) {
422 trace_seq_putc(s, '0');
423 goto out;
424 }
425
426 if (sym_flags & TRACE_ITER_SYM_OFFSET)
427 seq_print_sym_offset(s, "%s", ip);
428 else
429 seq_print_sym_short(s, "%s", ip);
430
431 if (sym_flags & TRACE_ITER_SYM_ADDR)
432 trace_seq_printf(s, " <" IP_FMT ">", ip);
433
434 out:
435 return !trace_seq_has_overflowed(s);
436 }
437
438 /**
439 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
440 * @s: trace seq struct to write to
441 * @entry: The trace entry field from the ring buffer
442 *
443 * Prints the generic fields of irqs off, in hard or softirq, preempt
444 * count.
445 */
446 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
447 {
448 char hardsoft_irq;
449 char need_resched;
450 char irqs_off;
451 int hardirq;
452 int softirq;
453 int nmi;
454
455 nmi = entry->flags & TRACE_FLAG_NMI;
456 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
457 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
458
459 irqs_off =
460 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
461 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
462 '.';
463
464 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
465 TRACE_FLAG_PREEMPT_RESCHED)) {
466 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
467 need_resched = 'N';
468 break;
469 case TRACE_FLAG_NEED_RESCHED:
470 need_resched = 'n';
471 break;
472 case TRACE_FLAG_PREEMPT_RESCHED:
473 need_resched = 'p';
474 break;
475 default:
476 need_resched = '.';
477 break;
478 }
479
480 hardsoft_irq =
481 (nmi && hardirq) ? 'Z' :
482 nmi ? 'z' :
483 (hardirq && softirq) ? 'H' :
484 hardirq ? 'h' :
485 softirq ? 's' :
486 '.' ;
487
488 trace_seq_printf(s, "%c%c%c",
489 irqs_off, need_resched, hardsoft_irq);
490
491 if (entry->preempt_count)
492 trace_seq_printf(s, "%x", entry->preempt_count);
493 else
494 trace_seq_putc(s, '.');
495
496 return !trace_seq_has_overflowed(s);
497 }
498
499 static int
500 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
501 {
502 char comm[TASK_COMM_LEN];
503
504 trace_find_cmdline(entry->pid, comm);
505
506 trace_seq_printf(s, "%8.8s-%-5d %3d",
507 comm, entry->pid, cpu);
508
509 return trace_print_lat_fmt(s, entry);
510 }
511
512 #undef MARK
513 #define MARK(v, s) {.val = v, .sym = s}
514 /* trace overhead mark */
515 static const struct trace_mark {
516 unsigned long long val; /* unit: nsec */
517 char sym;
518 } mark[] = {
519 MARK(1000000000ULL , '$'), /* 1 sec */
520 MARK(100000000ULL , '@'), /* 100 msec */
521 MARK(10000000ULL , '*'), /* 10 msec */
522 MARK(1000000ULL , '#'), /* 1000 usecs */
523 MARK(100000ULL , '!'), /* 100 usecs */
524 MARK(10000ULL , '+'), /* 10 usecs */
525 };
526 #undef MARK
527
528 char trace_find_mark(unsigned long long d)
529 {
530 int i;
531 int size = ARRAY_SIZE(mark);
532
533 for (i = 0; i < size; i++) {
534 if (d > mark[i].val)
535 break;
536 }
537
538 return (i == size) ? ' ' : mark[i].sym;
539 }
540
541 static int
542 lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
543 {
544 struct trace_array *tr = iter->tr;
545 unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
546 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
547 unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start;
548 unsigned long long rel_ts = next_ts - iter->ts;
549 struct trace_seq *s = &iter->seq;
550
551 if (in_ns) {
552 abs_ts = ns2usecs(abs_ts);
553 rel_ts = ns2usecs(rel_ts);
554 }
555
556 if (verbose && in_ns) {
557 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
558 unsigned long abs_msec = (unsigned long)abs_ts;
559 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
560 unsigned long rel_msec = (unsigned long)rel_ts;
561
562 trace_seq_printf(
563 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
564 ns2usecs(iter->ts),
565 abs_msec, abs_usec,
566 rel_msec, rel_usec);
567
568 } else if (verbose && !in_ns) {
569 trace_seq_printf(
570 s, "[%016llx] %lld (+%lld): ",
571 iter->ts, abs_ts, rel_ts);
572
573 } else if (!verbose && in_ns) {
574 trace_seq_printf(
575 s, " %4lldus%c: ",
576 abs_ts,
577 trace_find_mark(rel_ts * NSEC_PER_USEC));
578
579 } else { /* !verbose && !in_ns */
580 trace_seq_printf(s, " %4lld: ", abs_ts);
581 }
582
583 return !trace_seq_has_overflowed(s);
584 }
585
586 int trace_print_context(struct trace_iterator *iter)
587 {
588 struct trace_array *tr = iter->tr;
589 struct trace_seq *s = &iter->seq;
590 struct trace_entry *entry = iter->ent;
591 unsigned long long t;
592 unsigned long secs, usec_rem;
593 char comm[TASK_COMM_LEN];
594
595 trace_find_cmdline(entry->pid, comm);
596
597 trace_seq_printf(s, "%16s-%-5d [%03d] ",
598 comm, entry->pid, iter->cpu);
599
600 if (tr->trace_flags & TRACE_ITER_RECORD_TGID) {
601 unsigned int tgid = trace_find_tgid(entry->pid);
602
603 if (!tgid)
604 trace_seq_printf(s, "(-----) ");
605 else
606 trace_seq_printf(s, "(%5d) ", tgid);
607 }
608
609 if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
610 trace_print_lat_fmt(s, entry);
611
612 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
613 t = ns2usecs(iter->ts);
614 usec_rem = do_div(t, USEC_PER_SEC);
615 secs = (unsigned long)t;
616 trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
617 } else
618 trace_seq_printf(s, " %12llu: ", iter->ts);
619
620 return !trace_seq_has_overflowed(s);
621 }
622
623 int trace_print_lat_context(struct trace_iterator *iter)
624 {
625 struct trace_array *tr = iter->tr;
626 /* trace_find_next_entry will reset ent_size */
627 int ent_size = iter->ent_size;
628 struct trace_seq *s = &iter->seq;
629 u64 next_ts;
630 struct trace_entry *entry = iter->ent,
631 *next_entry = trace_find_next_entry(iter, NULL,
632 &next_ts);
633 unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
634
635 /* Restore the original ent_size */
636 iter->ent_size = ent_size;
637
638 if (!next_entry)
639 next_ts = iter->ts;
640
641 if (verbose) {
642 char comm[TASK_COMM_LEN];
643
644 trace_find_cmdline(entry->pid, comm);
645
646 trace_seq_printf(
647 s, "%16s %5d %3d %d %08x %08lx ",
648 comm, entry->pid, iter->cpu, entry->flags,
649 entry->preempt_count, iter->idx);
650 } else {
651 lat_print_generic(s, entry, iter->cpu);
652 }
653
654 lat_print_timestamp(iter, next_ts);
655
656 return !trace_seq_has_overflowed(s);
657 }
658
659 /**
660 * ftrace_find_event - find a registered event
661 * @type: the type of event to look for
662 *
663 * Returns an event of type @type otherwise NULL
664 * Called with trace_event_read_lock() held.
665 */
666 struct trace_event *ftrace_find_event(int type)
667 {
668 struct trace_event *event;
669 unsigned key;
670
671 key = type & (EVENT_HASHSIZE - 1);
672
673 hlist_for_each_entry(event, &event_hash[key], node) {
674 if (event->type == type)
675 return event;
676 }
677
678 return NULL;
679 }
680
681 static LIST_HEAD(ftrace_event_list);
682
683 static int trace_search_list(struct list_head **list)
684 {
685 struct trace_event *e;
686 int last = __TRACE_LAST_TYPE;
687
688 if (list_empty(&ftrace_event_list)) {
689 *list = &ftrace_event_list;
690 return last + 1;
691 }
692
693 /*
694 * We used up all possible max events,
695 * lets see if somebody freed one.
696 */
697 list_for_each_entry(e, &ftrace_event_list, list) {
698 if (e->type != last + 1)
699 break;
700 last++;
701 }
702
703 /* Did we used up all 65 thousand events??? */
704 if ((last + 1) > TRACE_EVENT_TYPE_MAX)
705 return 0;
706
707 *list = &e->list;
708 return last + 1;
709 }
710
711 void trace_event_read_lock(void)
712 {
713 down_read(&trace_event_sem);
714 }
715
716 void trace_event_read_unlock(void)
717 {
718 up_read(&trace_event_sem);
719 }
720
721 /**
722 * register_trace_event - register output for an event type
723 * @event: the event type to register
724 *
725 * Event types are stored in a hash and this hash is used to
726 * find a way to print an event. If the @event->type is set
727 * then it will use that type, otherwise it will assign a
728 * type to use.
729 *
730 * If you assign your own type, please make sure it is added
731 * to the trace_type enum in trace.h, to avoid collisions
732 * with the dynamic types.
733 *
734 * Returns the event type number or zero on error.
735 */
736 int register_trace_event(struct trace_event *event)
737 {
738 unsigned key;
739 int ret = 0;
740
741 down_write(&trace_event_sem);
742
743 if (WARN_ON(!event))
744 goto out;
745
746 if (WARN_ON(!event->funcs))
747 goto out;
748
749 INIT_LIST_HEAD(&event->list);
750
751 if (!event->type) {
752 struct list_head *list = NULL;
753
754 if (next_event_type > TRACE_EVENT_TYPE_MAX) {
755
756 event->type = trace_search_list(&list);
757 if (!event->type)
758 goto out;
759
760 } else {
761
762 event->type = next_event_type++;
763 list = &ftrace_event_list;
764 }
765
766 if (WARN_ON(ftrace_find_event(event->type)))
767 goto out;
768
769 list_add_tail(&event->list, list);
770
771 } else if (event->type > __TRACE_LAST_TYPE) {
772 printk(KERN_WARNING "Need to add type to trace.h\n");
773 WARN_ON(1);
774 goto out;
775 } else {
776 /* Is this event already used */
777 if (ftrace_find_event(event->type))
778 goto out;
779 }
780
781 if (event->funcs->trace == NULL)
782 event->funcs->trace = trace_nop_print;
783 if (event->funcs->raw == NULL)
784 event->funcs->raw = trace_nop_print;
785 if (event->funcs->hex == NULL)
786 event->funcs->hex = trace_nop_print;
787 if (event->funcs->binary == NULL)
788 event->funcs->binary = trace_nop_print;
789
790 key = event->type & (EVENT_HASHSIZE - 1);
791
792 hlist_add_head(&event->node, &event_hash[key]);
793
794 ret = event->type;
795 out:
796 up_write(&trace_event_sem);
797
798 return ret;
799 }
800 EXPORT_SYMBOL_GPL(register_trace_event);
801
802 /*
803 * Used by module code with the trace_event_sem held for write.
804 */
805 int __unregister_trace_event(struct trace_event *event)
806 {
807 hlist_del(&event->node);
808 list_del(&event->list);
809 return 0;
810 }
811
812 /**
813 * unregister_trace_event - remove a no longer used event
814 * @event: the event to remove
815 */
816 int unregister_trace_event(struct trace_event *event)
817 {
818 down_write(&trace_event_sem);
819 __unregister_trace_event(event);
820 up_write(&trace_event_sem);
821
822 return 0;
823 }
824 EXPORT_SYMBOL_GPL(unregister_trace_event);
825
826 /*
827 * Standard events
828 */
829
830 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
831 struct trace_event *event)
832 {
833 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
834
835 return trace_handle_return(&iter->seq);
836 }
837
838 /* TRACE_FN */
839 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
840 struct trace_event *event)
841 {
842 struct ftrace_entry *field;
843 struct trace_seq *s = &iter->seq;
844
845 trace_assign_type(field, iter->ent);
846
847 seq_print_ip_sym(s, field->ip, flags);
848
849 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
850 trace_seq_puts(s, " <-");
851 seq_print_ip_sym(s, field->parent_ip, flags);
852 }
853
854 trace_seq_putc(s, '\n');
855
856 return trace_handle_return(s);
857 }
858
859 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
860 struct trace_event *event)
861 {
862 struct ftrace_entry *field;
863
864 trace_assign_type(field, iter->ent);
865
866 trace_seq_printf(&iter->seq, "%lx %lx\n",
867 field->ip,
868 field->parent_ip);
869
870 return trace_handle_return(&iter->seq);
871 }
872
873 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
874 struct trace_event *event)
875 {
876 struct ftrace_entry *field;
877 struct trace_seq *s = &iter->seq;
878
879 trace_assign_type(field, iter->ent);
880
881 SEQ_PUT_HEX_FIELD(s, field->ip);
882 SEQ_PUT_HEX_FIELD(s, field->parent_ip);
883
884 return trace_handle_return(s);
885 }
886
887 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
888 struct trace_event *event)
889 {
890 struct ftrace_entry *field;
891 struct trace_seq *s = &iter->seq;
892
893 trace_assign_type(field, iter->ent);
894
895 SEQ_PUT_FIELD(s, field->ip);
896 SEQ_PUT_FIELD(s, field->parent_ip);
897
898 return trace_handle_return(s);
899 }
900
901 static struct trace_event_functions trace_fn_funcs = {
902 .trace = trace_fn_trace,
903 .raw = trace_fn_raw,
904 .hex = trace_fn_hex,
905 .binary = trace_fn_bin,
906 };
907
908 static struct trace_event trace_fn_event = {
909 .type = TRACE_FN,
910 .funcs = &trace_fn_funcs,
911 };
912
913 /* TRACE_CTX an TRACE_WAKE */
914 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
915 char *delim)
916 {
917 struct ctx_switch_entry *field;
918 char comm[TASK_COMM_LEN];
919 int S, T;
920
921
922 trace_assign_type(field, iter->ent);
923
924 T = task_index_to_char(field->next_state);
925 S = task_index_to_char(field->prev_state);
926 trace_find_cmdline(field->next_pid, comm);
927 trace_seq_printf(&iter->seq,
928 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
929 field->prev_pid,
930 field->prev_prio,
931 S, delim,
932 field->next_cpu,
933 field->next_pid,
934 field->next_prio,
935 T, comm);
936
937 return trace_handle_return(&iter->seq);
938 }
939
940 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
941 struct trace_event *event)
942 {
943 return trace_ctxwake_print(iter, "==>");
944 }
945
946 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
947 int flags, struct trace_event *event)
948 {
949 return trace_ctxwake_print(iter, " +");
950 }
951
952 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
953 {
954 struct ctx_switch_entry *field;
955 int T;
956
957 trace_assign_type(field, iter->ent);
958
959 if (!S)
960 S = task_index_to_char(field->prev_state);
961 T = task_index_to_char(field->next_state);
962 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
963 field->prev_pid,
964 field->prev_prio,
965 S,
966 field->next_cpu,
967 field->next_pid,
968 field->next_prio,
969 T);
970
971 return trace_handle_return(&iter->seq);
972 }
973
974 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
975 struct trace_event *event)
976 {
977 return trace_ctxwake_raw(iter, 0);
978 }
979
980 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
981 struct trace_event *event)
982 {
983 return trace_ctxwake_raw(iter, '+');
984 }
985
986
987 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
988 {
989 struct ctx_switch_entry *field;
990 struct trace_seq *s = &iter->seq;
991 int T;
992
993 trace_assign_type(field, iter->ent);
994
995 if (!S)
996 S = task_index_to_char(field->prev_state);
997 T = task_index_to_char(field->next_state);
998
999 SEQ_PUT_HEX_FIELD(s, field->prev_pid);
1000 SEQ_PUT_HEX_FIELD(s, field->prev_prio);
1001 SEQ_PUT_HEX_FIELD(s, S);
1002 SEQ_PUT_HEX_FIELD(s, field->next_cpu);
1003 SEQ_PUT_HEX_FIELD(s, field->next_pid);
1004 SEQ_PUT_HEX_FIELD(s, field->next_prio);
1005 SEQ_PUT_HEX_FIELD(s, T);
1006
1007 return trace_handle_return(s);
1008 }
1009
1010 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1011 struct trace_event *event)
1012 {
1013 return trace_ctxwake_hex(iter, 0);
1014 }
1015
1016 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1017 struct trace_event *event)
1018 {
1019 return trace_ctxwake_hex(iter, '+');
1020 }
1021
1022 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1023 int flags, struct trace_event *event)
1024 {
1025 struct ctx_switch_entry *field;
1026 struct trace_seq *s = &iter->seq;
1027
1028 trace_assign_type(field, iter->ent);
1029
1030 SEQ_PUT_FIELD(s, field->prev_pid);
1031 SEQ_PUT_FIELD(s, field->prev_prio);
1032 SEQ_PUT_FIELD(s, field->prev_state);
1033 SEQ_PUT_FIELD(s, field->next_cpu);
1034 SEQ_PUT_FIELD(s, field->next_pid);
1035 SEQ_PUT_FIELD(s, field->next_prio);
1036 SEQ_PUT_FIELD(s, field->next_state);
1037
1038 return trace_handle_return(s);
1039 }
1040
1041 static struct trace_event_functions trace_ctx_funcs = {
1042 .trace = trace_ctx_print,
1043 .raw = trace_ctx_raw,
1044 .hex = trace_ctx_hex,
1045 .binary = trace_ctxwake_bin,
1046 };
1047
1048 static struct trace_event trace_ctx_event = {
1049 .type = TRACE_CTX,
1050 .funcs = &trace_ctx_funcs,
1051 };
1052
1053 static struct trace_event_functions trace_wake_funcs = {
1054 .trace = trace_wake_print,
1055 .raw = trace_wake_raw,
1056 .hex = trace_wake_hex,
1057 .binary = trace_ctxwake_bin,
1058 };
1059
1060 static struct trace_event trace_wake_event = {
1061 .type = TRACE_WAKE,
1062 .funcs = &trace_wake_funcs,
1063 };
1064
1065 /* TRACE_STACK */
1066
1067 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1068 int flags, struct trace_event *event)
1069 {
1070 struct stack_entry *field;
1071 struct trace_seq *s = &iter->seq;
1072 unsigned long *p;
1073 unsigned long *end;
1074
1075 trace_assign_type(field, iter->ent);
1076 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1077
1078 trace_seq_puts(s, "<stack trace>\n");
1079
1080 for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1081
1082 if (trace_seq_has_overflowed(s))
1083 break;
1084
1085 trace_seq_puts(s, " => ");
1086 seq_print_ip_sym(s, *p, flags);
1087 trace_seq_putc(s, '\n');
1088 }
1089
1090 return trace_handle_return(s);
1091 }
1092
1093 static struct trace_event_functions trace_stack_funcs = {
1094 .trace = trace_stack_print,
1095 };
1096
1097 static struct trace_event trace_stack_event = {
1098 .type = TRACE_STACK,
1099 .funcs = &trace_stack_funcs,
1100 };
1101
1102 /* TRACE_USER_STACK */
1103 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1104 int flags, struct trace_event *event)
1105 {
1106 struct trace_array *tr = iter->tr;
1107 struct userstack_entry *field;
1108 struct trace_seq *s = &iter->seq;
1109 struct mm_struct *mm = NULL;
1110 unsigned int i;
1111
1112 trace_assign_type(field, iter->ent);
1113
1114 trace_seq_puts(s, "<user stack trace>\n");
1115
1116 if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
1117 struct task_struct *task;
1118 /*
1119 * we do the lookup on the thread group leader,
1120 * since individual threads might have already quit!
1121 */
1122 rcu_read_lock();
1123 task = find_task_by_vpid(field->tgid);
1124 if (task)
1125 mm = get_task_mm(task);
1126 rcu_read_unlock();
1127 }
1128
1129 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1130 unsigned long ip = field->caller[i];
1131
1132 if (ip == ULONG_MAX || trace_seq_has_overflowed(s))
1133 break;
1134
1135 trace_seq_puts(s, " => ");
1136
1137 if (!ip) {
1138 trace_seq_puts(s, "??");
1139 trace_seq_putc(s, '\n');
1140 continue;
1141 }
1142
1143 seq_print_user_ip(s, mm, ip, flags);
1144 trace_seq_putc(s, '\n');
1145 }
1146
1147 if (mm)
1148 mmput(mm);
1149
1150 return trace_handle_return(s);
1151 }
1152
1153 static struct trace_event_functions trace_user_stack_funcs = {
1154 .trace = trace_user_stack_print,
1155 };
1156
1157 static struct trace_event trace_user_stack_event = {
1158 .type = TRACE_USER_STACK,
1159 .funcs = &trace_user_stack_funcs,
1160 };
1161
1162 /* TRACE_HWLAT */
1163 static enum print_line_t
1164 trace_hwlat_print(struct trace_iterator *iter, int flags,
1165 struct trace_event *event)
1166 {
1167 struct trace_entry *entry = iter->ent;
1168 struct trace_seq *s = &iter->seq;
1169 struct hwlat_entry *field;
1170
1171 trace_assign_type(field, entry);
1172
1173 trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld",
1174 field->seqnum,
1175 field->duration,
1176 field->outer_duration,
1177 (long long)field->timestamp.tv_sec,
1178 field->timestamp.tv_nsec);
1179
1180 if (field->nmi_count) {
1181 /*
1182 * The generic sched_clock() is not NMI safe, thus
1183 * we only record the count and not the time.
1184 */
1185 if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK))
1186 trace_seq_printf(s, " nmi-total:%llu",
1187 field->nmi_total_ts);
1188 trace_seq_printf(s, " nmi-count:%u",
1189 field->nmi_count);
1190 }
1191
1192 trace_seq_putc(s, '\n');
1193
1194 return trace_handle_return(s);
1195 }
1196
1197
1198 static enum print_line_t
1199 trace_hwlat_raw(struct trace_iterator *iter, int flags,
1200 struct trace_event *event)
1201 {
1202 struct hwlat_entry *field;
1203 struct trace_seq *s = &iter->seq;
1204
1205 trace_assign_type(field, iter->ent);
1206
1207 trace_seq_printf(s, "%llu %lld %lld %09ld %u\n",
1208 field->duration,
1209 field->outer_duration,
1210 (long long)field->timestamp.tv_sec,
1211 field->timestamp.tv_nsec,
1212 field->seqnum);
1213
1214 return trace_handle_return(s);
1215 }
1216
1217 static struct trace_event_functions trace_hwlat_funcs = {
1218 .trace = trace_hwlat_print,
1219 .raw = trace_hwlat_raw,
1220 };
1221
1222 static struct trace_event trace_hwlat_event = {
1223 .type = TRACE_HWLAT,
1224 .funcs = &trace_hwlat_funcs,
1225 };
1226
1227 /* TRACE_BPUTS */
1228 static enum print_line_t
1229 trace_bputs_print(struct trace_iterator *iter, int flags,
1230 struct trace_event *event)
1231 {
1232 struct trace_entry *entry = iter->ent;
1233 struct trace_seq *s = &iter->seq;
1234 struct bputs_entry *field;
1235
1236 trace_assign_type(field, entry);
1237
1238 seq_print_ip_sym(s, field->ip, flags);
1239 trace_seq_puts(s, ": ");
1240 trace_seq_puts(s, field->str);
1241
1242 return trace_handle_return(s);
1243 }
1244
1245
1246 static enum print_line_t
1247 trace_bputs_raw(struct trace_iterator *iter, int flags,
1248 struct trace_event *event)
1249 {
1250 struct bputs_entry *field;
1251 struct trace_seq *s = &iter->seq;
1252
1253 trace_assign_type(field, iter->ent);
1254
1255 trace_seq_printf(s, ": %lx : ", field->ip);
1256 trace_seq_puts(s, field->str);
1257
1258 return trace_handle_return(s);
1259 }
1260
1261 static struct trace_event_functions trace_bputs_funcs = {
1262 .trace = trace_bputs_print,
1263 .raw = trace_bputs_raw,
1264 };
1265
1266 static struct trace_event trace_bputs_event = {
1267 .type = TRACE_BPUTS,
1268 .funcs = &trace_bputs_funcs,
1269 };
1270
1271 /* TRACE_BPRINT */
1272 static enum print_line_t
1273 trace_bprint_print(struct trace_iterator *iter, int flags,
1274 struct trace_event *event)
1275 {
1276 struct trace_entry *entry = iter->ent;
1277 struct trace_seq *s = &iter->seq;
1278 struct bprint_entry *field;
1279
1280 trace_assign_type(field, entry);
1281
1282 seq_print_ip_sym(s, field->ip, flags);
1283 trace_seq_puts(s, ": ");
1284 trace_seq_bprintf(s, field->fmt, field->buf);
1285
1286 return trace_handle_return(s);
1287 }
1288
1289
1290 static enum print_line_t
1291 trace_bprint_raw(struct trace_iterator *iter, int flags,
1292 struct trace_event *event)
1293 {
1294 struct bprint_entry *field;
1295 struct trace_seq *s = &iter->seq;
1296
1297 trace_assign_type(field, iter->ent);
1298
1299 trace_seq_printf(s, ": %lx : ", field->ip);
1300 trace_seq_bprintf(s, field->fmt, field->buf);
1301
1302 return trace_handle_return(s);
1303 }
1304
1305 static struct trace_event_functions trace_bprint_funcs = {
1306 .trace = trace_bprint_print,
1307 .raw = trace_bprint_raw,
1308 };
1309
1310 static struct trace_event trace_bprint_event = {
1311 .type = TRACE_BPRINT,
1312 .funcs = &trace_bprint_funcs,
1313 };
1314
1315 /* TRACE_PRINT */
1316 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1317 int flags, struct trace_event *event)
1318 {
1319 struct print_entry *field;
1320 struct trace_seq *s = &iter->seq;
1321
1322 trace_assign_type(field, iter->ent);
1323
1324 seq_print_ip_sym(s, field->ip, flags);
1325 trace_seq_printf(s, ": %s", field->buf);
1326
1327 return trace_handle_return(s);
1328 }
1329
1330 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1331 struct trace_event *event)
1332 {
1333 struct print_entry *field;
1334
1335 trace_assign_type(field, iter->ent);
1336
1337 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1338
1339 return trace_handle_return(&iter->seq);
1340 }
1341
1342 static struct trace_event_functions trace_print_funcs = {
1343 .trace = trace_print_print,
1344 .raw = trace_print_raw,
1345 };
1346
1347 static struct trace_event trace_print_event = {
1348 .type = TRACE_PRINT,
1349 .funcs = &trace_print_funcs,
1350 };
1351
1352 static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags,
1353 struct trace_event *event)
1354 {
1355 struct raw_data_entry *field;
1356 int i;
1357
1358 trace_assign_type(field, iter->ent);
1359
1360 trace_seq_printf(&iter->seq, "# %x buf:", field->id);
1361
1362 for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++)
1363 trace_seq_printf(&iter->seq, " %02x",
1364 (unsigned char)field->buf[i]);
1365
1366 trace_seq_putc(&iter->seq, '\n');
1367
1368 return trace_handle_return(&iter->seq);
1369 }
1370
1371 static struct trace_event_functions trace_raw_data_funcs = {
1372 .trace = trace_raw_data,
1373 .raw = trace_raw_data,
1374 };
1375
1376 static struct trace_event trace_raw_data_event = {
1377 .type = TRACE_RAW_DATA,
1378 .funcs = &trace_raw_data_funcs,
1379 };
1380
1381
1382 static struct trace_event *events[] __initdata = {
1383 &trace_fn_event,
1384 &trace_ctx_event,
1385 &trace_wake_event,
1386 &trace_stack_event,
1387 &trace_user_stack_event,
1388 &trace_bputs_event,
1389 &trace_bprint_event,
1390 &trace_print_event,
1391 &trace_hwlat_event,
1392 &trace_raw_data_event,
1393 NULL
1394 };
1395
1396 __init static int init_events(void)
1397 {
1398 struct trace_event *event;
1399 int i, ret;
1400
1401 for (i = 0; events[i]; i++) {
1402 event = events[i];
1403
1404 ret = register_trace_event(event);
1405 if (!ret) {
1406 printk(KERN_WARNING "event %d failed to register\n",
1407 event->type);
1408 WARN_ON_ONCE(1);
1409 }
1410 }
1411
1412 return 0;
1413 }
1414 early_initcall(init_events);
Linux with added FPC-III support