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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 struct trace_seq *s = &iter->seq;
321 va_list ap;
322
323 if (ignore_event(iter))
324 return;
325
326 va_start(ap, fmt);
327 trace_seq_vprintf(s, trace_event_format(iter, fmt), ap);
328 va_end(ap);
329}
330EXPORT_SYMBOL(trace_event_printf);
331
332static __printf(3, 0)
333int trace_output_raw(struct trace_iterator *iter, char *name,
334 char *fmt, va_list ap)
335{
336 struct trace_seq *s = &iter->seq;
337
338 trace_seq_printf(s, "%s: ", name);
339 trace_seq_vprintf(s, trace_event_format(iter, fmt), ap);
340
341 return trace_handle_return(s);
342}
343
344int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
345{
346 va_list ap;
347 int ret;
348
349 va_start(ap, fmt);
350 ret = trace_output_raw(iter, name, fmt, ap);
351 va_end(ap);
352
353 return ret;
354}
355EXPORT_SYMBOL_GPL(trace_output_call);
356
357static inline const char *kretprobed(const char *name, unsigned long addr)
358{
359 if (is_kretprobe_trampoline(addr))
360 return "[unknown/kretprobe'd]";
361 return name;
362}
363
364void
365trace_seq_print_sym(struct trace_seq *s, unsigned long address, bool offset)
366{
367#ifdef CONFIG_KALLSYMS
368 char str[KSYM_SYMBOL_LEN];
369 const char *name;
370
371 if (offset)
372 sprint_symbol(str, address);
373 else
374 kallsyms_lookup(address, NULL, NULL, NULL, str);
375 name = kretprobed(str, address);
376
377 if (name && strlen(name)) {
378 trace_seq_puts(s, name);
379 return;
380 }
381#endif
382 trace_seq_printf(s, "0x%08lx", address);
383}
384
385#ifndef CONFIG_64BIT
386# define IP_FMT "%08lx"
387#else
388# define IP_FMT "%016lx"
389#endif
390
391static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
392 unsigned long ip, unsigned long sym_flags)
393{
394 struct file *file = NULL;
395 unsigned long vmstart = 0;
396 int ret = 1;
397
398 if (s->full)
399 return 0;
400
401 if (mm) {
402 const struct vm_area_struct *vma;
403
404 mmap_read_lock(mm);
405 vma = find_vma(mm, ip);
406 if (vma) {
407 file = vma->vm_file;
408 vmstart = vma->vm_start;
409 }
410 if (file) {
411 ret = trace_seq_path(s, file_user_path(file));
412 if (ret)
413 trace_seq_printf(s, "[+0x%lx]",
414 ip - vmstart);
415 }
416 mmap_read_unlock(mm);
417 }
418 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
419 trace_seq_printf(s, " <" IP_FMT ">", ip);
420 return !trace_seq_has_overflowed(s);
421}
422
423int
424seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
425{
426 if (!ip) {
427 trace_seq_putc(s, '0');
428 goto out;
429 }
430
431 trace_seq_print_sym(s, ip, sym_flags & TRACE_ITER_SYM_OFFSET);
432
433 if (sym_flags & TRACE_ITER_SYM_ADDR)
434 trace_seq_printf(s, " <" IP_FMT ">", ip);
435
436 out:
437 return !trace_seq_has_overflowed(s);
438}
439
440/**
441 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
442 * @s: trace seq struct to write to
443 * @entry: The trace entry field from the ring buffer
444 *
445 * Prints the generic fields of irqs off, in hard or softirq, preempt
446 * count.
447 */
448int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
449{
450 char hardsoft_irq;
451 char need_resched;
452 char irqs_off;
453 int hardirq;
454 int softirq;
455 int bh_off;
456 int nmi;
457
458 nmi = entry->flags & TRACE_FLAG_NMI;
459 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
460 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
461 bh_off = entry->flags & TRACE_FLAG_BH_OFF;
462
463 irqs_off =
464 (entry->flags & TRACE_FLAG_IRQS_OFF && bh_off) ? 'D' :
465 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
466 bh_off ? 'b' :
467 '.';
468
469 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_NEED_RESCHED_LAZY |
470 TRACE_FLAG_PREEMPT_RESCHED)) {
471 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_NEED_RESCHED_LAZY | TRACE_FLAG_PREEMPT_RESCHED:
472 need_resched = 'B';
473 break;
474 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
475 need_resched = 'N';
476 break;
477 case TRACE_FLAG_NEED_RESCHED_LAZY | TRACE_FLAG_PREEMPT_RESCHED:
478 need_resched = 'L';
479 break;
480 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_NEED_RESCHED_LAZY:
481 need_resched = 'b';
482 break;
483 case TRACE_FLAG_NEED_RESCHED:
484 need_resched = 'n';
485 break;
486 case TRACE_FLAG_PREEMPT_RESCHED:
487 need_resched = 'p';
488 break;
489 case TRACE_FLAG_NEED_RESCHED_LAZY:
490 need_resched = 'l';
491 break;
492 default:
493 need_resched = '.';
494 break;
495 }
496
497 hardsoft_irq =
498 (nmi && hardirq) ? 'Z' :
499 nmi ? 'z' :
500 (hardirq && softirq) ? 'H' :
501 hardirq ? 'h' :
502 softirq ? 's' :
503 '.' ;
504
505 trace_seq_printf(s, "%c%c%c",
506 irqs_off, need_resched, hardsoft_irq);
507
508 if (entry->preempt_count & 0xf)
509 trace_seq_printf(s, "%x", entry->preempt_count & 0xf);
510 else
511 trace_seq_putc(s, '.');
512
513 if (entry->preempt_count & 0xf0)
514 trace_seq_printf(s, "%x", entry->preempt_count >> 4);
515 else
516 trace_seq_putc(s, '.');
517
518 return !trace_seq_has_overflowed(s);
519}
520
521static int
522lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
523{
524 char comm[TASK_COMM_LEN];
525
526 trace_find_cmdline(entry->pid, comm);
527
528 trace_seq_printf(s, "%8.8s-%-7d %3d",
529 comm, entry->pid, cpu);
530
531 return trace_print_lat_fmt(s, entry);
532}
533
534#undef MARK
535#define MARK(v, s) {.val = v, .sym = s}
536/* trace overhead mark */
537static const struct trace_mark {
538 unsigned long long val; /* unit: nsec */
539 char sym;
540} mark[] = {
541 MARK(1000000000ULL , '$'), /* 1 sec */
542 MARK(100000000ULL , '@'), /* 100 msec */
543 MARK(10000000ULL , '*'), /* 10 msec */
544 MARK(1000000ULL , '#'), /* 1000 usecs */
545 MARK(100000ULL , '!'), /* 100 usecs */
546 MARK(10000ULL , '+'), /* 10 usecs */
547};
548#undef MARK
549
550char trace_find_mark(unsigned long long d)
551{
552 int i;
553 int size = ARRAY_SIZE(mark);
554
555 for (i = 0; i < size; i++) {
556 if (d > mark[i].val)
557 break;
558 }
559
560 return (i == size) ? ' ' : mark[i].sym;
561}
562
563static int
564lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
565{
566 struct trace_array *tr = iter->tr;
567 unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
568 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
569 unsigned long long abs_ts = iter->ts - iter->array_buffer->time_start;
570 unsigned long long rel_ts = next_ts - iter->ts;
571 struct trace_seq *s = &iter->seq;
572
573 if (in_ns) {
574 abs_ts = ns2usecs(abs_ts);
575 rel_ts = ns2usecs(rel_ts);
576 }
577
578 if (verbose && in_ns) {
579 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
580 unsigned long abs_msec = (unsigned long)abs_ts;
581 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
582 unsigned long rel_msec = (unsigned long)rel_ts;
583
584 trace_seq_printf(
585 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
586 ns2usecs(iter->ts),
587 abs_msec, abs_usec,
588 rel_msec, rel_usec);
589
590 } else if (verbose && !in_ns) {
591 trace_seq_printf(
592 s, "[%016llx] %lld (+%lld): ",
593 iter->ts, abs_ts, rel_ts);
594
595 } else if (!verbose && in_ns) {
596 trace_seq_printf(
597 s, " %4lldus%c: ",
598 abs_ts,
599 trace_find_mark(rel_ts * NSEC_PER_USEC));
600
601 } else { /* !verbose && !in_ns */
602 trace_seq_printf(s, " %4lld: ", abs_ts);
603 }
604
605 return !trace_seq_has_overflowed(s);
606}
607
608static void trace_print_time(struct trace_seq *s, struct trace_iterator *iter,
609 unsigned long long ts)
610{
611 unsigned long secs, usec_rem;
612 unsigned long long t;
613
614 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
615 t = ns2usecs(ts);
616 usec_rem = do_div(t, USEC_PER_SEC);
617 secs = (unsigned long)t;
618 trace_seq_printf(s, " %5lu.%06lu", secs, usec_rem);
619 } else
620 trace_seq_printf(s, " %12llu", ts);
621}
622
623int trace_print_context(struct trace_iterator *iter)
624{
625 struct trace_array *tr = iter->tr;
626 struct trace_seq *s = &iter->seq;
627 struct trace_entry *entry = iter->ent;
628 char comm[TASK_COMM_LEN];
629
630 trace_find_cmdline(entry->pid, comm);
631
632 trace_seq_printf(s, "%16s-%-7d ", comm, entry->pid);
633
634 if (tr->trace_flags & TRACE_ITER_RECORD_TGID) {
635 unsigned int tgid = trace_find_tgid(entry->pid);
636
637 if (!tgid)
638 trace_seq_printf(s, "(-------) ");
639 else
640 trace_seq_printf(s, "(%7d) ", tgid);
641 }
642
643 trace_seq_printf(s, "[%03d] ", iter->cpu);
644
645 if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
646 trace_print_lat_fmt(s, entry);
647
648 trace_print_time(s, iter, iter->ts);
649 trace_seq_puts(s, ": ");
650
651 return !trace_seq_has_overflowed(s);
652}
653
654int trace_print_lat_context(struct trace_iterator *iter)
655{
656 struct trace_entry *entry, *next_entry;
657 struct trace_array *tr = iter->tr;
658 struct trace_seq *s = &iter->seq;
659 unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
660 u64 next_ts;
661
662 next_entry = trace_find_next_entry(iter, NULL, &next_ts);
663 if (!next_entry)
664 next_ts = iter->ts;
665
666 /* trace_find_next_entry() may change iter->ent */
667 entry = iter->ent;
668
669 if (verbose) {
670 char comm[TASK_COMM_LEN];
671
672 trace_find_cmdline(entry->pid, comm);
673
674 trace_seq_printf(
675 s, "%16s %7d %3d %d %08x %08lx ",
676 comm, entry->pid, iter->cpu, entry->flags,
677 entry->preempt_count & 0xf, iter->idx);
678 } else {
679 lat_print_generic(s, entry, iter->cpu);
680 }
681
682 lat_print_timestamp(iter, next_ts);
683
684 return !trace_seq_has_overflowed(s);
685}
686
687/**
688 * ftrace_find_event - find a registered event
689 * @type: the type of event to look for
690 *
691 * Returns an event of type @type otherwise NULL
692 * Called with trace_event_read_lock() held.
693 */
694struct trace_event *ftrace_find_event(int type)
695{
696 struct trace_event *event;
697 unsigned key;
698
699 key = type & (EVENT_HASHSIZE - 1);
700
701 hlist_for_each_entry(event, &event_hash[key], node) {
702 if (event->type == type)
703 return event;
704 }
705
706 return NULL;
707}
708
709static DEFINE_IDA(trace_event_ida);
710
711static void free_trace_event_type(int type)
712{
713 if (type >= __TRACE_LAST_TYPE)
714 ida_free(&trace_event_ida, type);
715}
716
717static int alloc_trace_event_type(void)
718{
719 int next;
720
721 /* Skip static defined type numbers */
722 next = ida_alloc_range(&trace_event_ida, __TRACE_LAST_TYPE,
723 TRACE_EVENT_TYPE_MAX, GFP_KERNEL);
724 if (next < 0)
725 return 0;
726 return next;
727}
728
729void trace_event_read_lock(void)
730{
731 down_read(&trace_event_sem);
732}
733
734void trace_event_read_unlock(void)
735{
736 up_read(&trace_event_sem);
737}
738
739/**
740 * register_trace_event - register output for an event type
741 * @event: the event type to register
742 *
743 * Event types are stored in a hash and this hash is used to
744 * find a way to print an event. If the @event->type is set
745 * then it will use that type, otherwise it will assign a
746 * type to use.
747 *
748 * If you assign your own type, please make sure it is added
749 * to the trace_type enum in trace.h, to avoid collisions
750 * with the dynamic types.
751 *
752 * Returns the event type number or zero on error.
753 */
754int register_trace_event(struct trace_event *event)
755{
756 unsigned key;
757 int ret = 0;
758
759 down_write(&trace_event_sem);
760
761 if (WARN_ON(!event))
762 goto out;
763
764 if (WARN_ON(!event->funcs))
765 goto out;
766
767 if (!event->type) {
768 event->type = alloc_trace_event_type();
769 if (!event->type)
770 goto out;
771 } else if (WARN(event->type > __TRACE_LAST_TYPE,
772 "Need to add type to trace.h")) {
773 goto out;
774 } else {
775 /* Is this event already used */
776 if (ftrace_find_event(event->type))
777 goto out;
778 }
779
780 if (event->funcs->trace == NULL)
781 event->funcs->trace = trace_nop_print;
782 if (event->funcs->raw == NULL)
783 event->funcs->raw = trace_nop_print;
784 if (event->funcs->hex == NULL)
785 event->funcs->hex = trace_nop_print;
786 if (event->funcs->binary == NULL)
787 event->funcs->binary = trace_nop_print;
788
789 key = event->type & (EVENT_HASHSIZE - 1);
790
791 hlist_add_head(&event->node, &event_hash[key]);
792
793 ret = event->type;
794 out:
795 up_write(&trace_event_sem);
796
797 return ret;
798}
799EXPORT_SYMBOL_GPL(register_trace_event);
800
801/*
802 * Used by module code with the trace_event_sem held for write.
803 */
804int __unregister_trace_event(struct trace_event *event)
805{
806 hlist_del(&event->node);
807 free_trace_event_type(event->type);
808 return 0;
809}
810
811/**
812 * unregister_trace_event - remove a no longer used event
813 * @event: the event to remove
814 */
815int unregister_trace_event(struct trace_event *event)
816{
817 down_write(&trace_event_sem);
818 __unregister_trace_event(event);
819 up_write(&trace_event_sem);
820
821 return 0;
822}
823EXPORT_SYMBOL_GPL(unregister_trace_event);
824
825/*
826 * Standard events
827 */
828
829static void print_array(struct trace_iterator *iter, void *pos,
830 struct ftrace_event_field *field)
831{
832 int offset;
833 int len;
834 int i;
835
836 offset = *(int *)pos & 0xffff;
837 len = *(int *)pos >> 16;
838
839 if (field)
840 offset += field->offset + sizeof(int);
841
842 if (offset + len > iter->ent_size) {
843 trace_seq_puts(&iter->seq, "<OVERFLOW>");
844 return;
845 }
846
847 pos = (void *)iter->ent + offset;
848
849 for (i = 0; i < len; i++, pos++) {
850 if (i)
851 trace_seq_putc(&iter->seq, ',');
852 trace_seq_printf(&iter->seq, "%02x", *(unsigned char *)pos);
853 }
854}
855
856static void print_fields(struct trace_iterator *iter, struct trace_event_call *call,
857 struct list_head *head)
858{
859 struct ftrace_event_field *field;
860 int offset;
861 int len;
862 int ret;
863 void *pos;
864
865 list_for_each_entry_reverse(field, head, link) {
866 trace_seq_printf(&iter->seq, " %s=", field->name);
867 if (field->offset + field->size > iter->ent_size) {
868 trace_seq_puts(&iter->seq, "<OVERFLOW>");
869 continue;
870 }
871 pos = (void *)iter->ent + field->offset;
872
873 switch (field->filter_type) {
874 case FILTER_COMM:
875 case FILTER_STATIC_STRING:
876 trace_seq_printf(&iter->seq, "%.*s", field->size, (char *)pos);
877 break;
878 case FILTER_RDYN_STRING:
879 case FILTER_DYN_STRING:
880 offset = *(int *)pos & 0xffff;
881 len = *(int *)pos >> 16;
882
883 if (field->filter_type == FILTER_RDYN_STRING)
884 offset += field->offset + sizeof(int);
885
886 if (offset + len > iter->ent_size) {
887 trace_seq_puts(&iter->seq, "<OVERFLOW>");
888 break;
889 }
890 pos = (void *)iter->ent + offset;
891 trace_seq_printf(&iter->seq, "%.*s", len, (char *)pos);
892 break;
893 case FILTER_PTR_STRING:
894 if (!iter->fmt_size)
895 trace_iter_expand_format(iter);
896 pos = *(void **)pos;
897 ret = strncpy_from_kernel_nofault(iter->fmt, pos,
898 iter->fmt_size);
899 if (ret < 0)
900 trace_seq_printf(&iter->seq, "(0x%px)", pos);
901 else
902 trace_seq_printf(&iter->seq, "(0x%px:%s)",
903 pos, iter->fmt);
904 break;
905 case FILTER_TRACE_FN:
906 pos = *(void **)pos;
907 trace_seq_printf(&iter->seq, "%pS", pos);
908 break;
909 case FILTER_CPU:
910 case FILTER_OTHER:
911 switch (field->size) {
912 case 1:
913 if (isprint(*(char *)pos)) {
914 trace_seq_printf(&iter->seq, "'%c'",
915 *(unsigned char *)pos);
916 }
917 trace_seq_printf(&iter->seq, "(%d)",
918 *(unsigned char *)pos);
919 break;
920 case 2:
921 trace_seq_printf(&iter->seq, "0x%x (%d)",
922 *(unsigned short *)pos,
923 *(unsigned short *)pos);
924 break;
925 case 4:
926 /* dynamic array info is 4 bytes */
927 if (strstr(field->type, "__data_loc")) {
928 print_array(iter, pos, NULL);
929 break;
930 }
931
932 if (strstr(field->type, "__rel_loc")) {
933 print_array(iter, pos, field);
934 break;
935 }
936
937 trace_seq_printf(&iter->seq, "0x%x (%d)",
938 *(unsigned int *)pos,
939 *(unsigned int *)pos);
940 break;
941 case 8:
942 trace_seq_printf(&iter->seq, "0x%llx (%lld)",
943 *(unsigned long long *)pos,
944 *(unsigned long long *)pos);
945 break;
946 default:
947 trace_seq_puts(&iter->seq, "<INVALID-SIZE>");
948 break;
949 }
950 break;
951 default:
952 trace_seq_puts(&iter->seq, "<INVALID-TYPE>");
953 }
954 }
955 trace_seq_putc(&iter->seq, '\n');
956}
957
958enum print_line_t print_event_fields(struct trace_iterator *iter,
959 struct trace_event *event)
960{
961 struct trace_event_call *call;
962 struct list_head *head;
963
964 /* ftrace defined events have separate call structures */
965 if (event->type <= __TRACE_LAST_TYPE) {
966 bool found = false;
967
968 down_read(&trace_event_sem);
969 list_for_each_entry(call, &ftrace_events, list) {
970 if (call->event.type == event->type) {
971 found = true;
972 break;
973 }
974 /* No need to search all events */
975 if (call->event.type > __TRACE_LAST_TYPE)
976 break;
977 }
978 up_read(&trace_event_sem);
979 if (!found) {
980 trace_seq_printf(&iter->seq, "UNKNOWN TYPE %d\n", event->type);
981 goto out;
982 }
983 } else {
984 call = container_of(event, struct trace_event_call, event);
985 }
986 head = trace_get_fields(call);
987
988 trace_seq_printf(&iter->seq, "%s:", trace_event_name(call));
989
990 if (head && !list_empty(head))
991 print_fields(iter, call, head);
992 else
993 trace_seq_puts(&iter->seq, "No fields found\n");
994
995 out:
996 return trace_handle_return(&iter->seq);
997}
998
999enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
1000 struct trace_event *event)
1001{
1002 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
1003
1004 return trace_handle_return(&iter->seq);
1005}
1006
1007static void print_fn_trace(struct trace_seq *s, unsigned long ip,
1008 unsigned long parent_ip, long delta, int flags)
1009{
1010 ip += delta;
1011 parent_ip += delta;
1012
1013 seq_print_ip_sym(s, ip, flags);
1014
1015 if ((flags & TRACE_ITER_PRINT_PARENT) && parent_ip) {
1016 trace_seq_puts(s, " <-");
1017 seq_print_ip_sym(s, parent_ip, flags);
1018 }
1019}
1020
1021/* TRACE_FN */
1022static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
1023 struct trace_event *event)
1024{
1025 struct ftrace_entry *field;
1026 struct trace_seq *s = &iter->seq;
1027
1028 trace_assign_type(field, iter->ent);
1029
1030 print_fn_trace(s, field->ip, field->parent_ip, iter->tr->text_delta, flags);
1031 trace_seq_putc(s, '\n');
1032
1033 return trace_handle_return(s);
1034}
1035
1036static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
1037 struct trace_event *event)
1038{
1039 struct ftrace_entry *field;
1040
1041 trace_assign_type(field, iter->ent);
1042
1043 trace_seq_printf(&iter->seq, "%lx %lx\n",
1044 field->ip,
1045 field->parent_ip);
1046
1047 return trace_handle_return(&iter->seq);
1048}
1049
1050static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
1051 struct trace_event *event)
1052{
1053 struct ftrace_entry *field;
1054 struct trace_seq *s = &iter->seq;
1055
1056 trace_assign_type(field, iter->ent);
1057
1058 SEQ_PUT_HEX_FIELD(s, field->ip);
1059 SEQ_PUT_HEX_FIELD(s, field->parent_ip);
1060
1061 return trace_handle_return(s);
1062}
1063
1064static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
1065 struct trace_event *event)
1066{
1067 struct ftrace_entry *field;
1068 struct trace_seq *s = &iter->seq;
1069
1070 trace_assign_type(field, iter->ent);
1071
1072 SEQ_PUT_FIELD(s, field->ip);
1073 SEQ_PUT_FIELD(s, field->parent_ip);
1074
1075 return trace_handle_return(s);
1076}
1077
1078static struct trace_event_functions trace_fn_funcs = {
1079 .trace = trace_fn_trace,
1080 .raw = trace_fn_raw,
1081 .hex = trace_fn_hex,
1082 .binary = trace_fn_bin,
1083};
1084
1085static struct trace_event trace_fn_event = {
1086 .type = TRACE_FN,
1087 .funcs = &trace_fn_funcs,
1088};
1089
1090/* TRACE_CTX an TRACE_WAKE */
1091static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
1092 char *delim)
1093{
1094 struct ctx_switch_entry *field;
1095 char comm[TASK_COMM_LEN];
1096 int S, T;
1097
1098
1099 trace_assign_type(field, iter->ent);
1100
1101 T = task_index_to_char(field->next_state);
1102 S = task_index_to_char(field->prev_state);
1103 trace_find_cmdline(field->next_pid, comm);
1104 trace_seq_printf(&iter->seq,
1105 " %7d:%3d:%c %s [%03d] %7d:%3d:%c %s\n",
1106 field->prev_pid,
1107 field->prev_prio,
1108 S, delim,
1109 field->next_cpu,
1110 field->next_pid,
1111 field->next_prio,
1112 T, comm);
1113
1114 return trace_handle_return(&iter->seq);
1115}
1116
1117static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
1118 struct trace_event *event)
1119{
1120 return trace_ctxwake_print(iter, "==>");
1121}
1122
1123static enum print_line_t trace_wake_print(struct trace_iterator *iter,
1124 int flags, struct trace_event *event)
1125{
1126 return trace_ctxwake_print(iter, " +");
1127}
1128
1129static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
1130{
1131 struct ctx_switch_entry *field;
1132 int T;
1133
1134 trace_assign_type(field, iter->ent);
1135
1136 if (!S)
1137 S = task_index_to_char(field->prev_state);
1138 T = task_index_to_char(field->next_state);
1139 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
1140 field->prev_pid,
1141 field->prev_prio,
1142 S,
1143 field->next_cpu,
1144 field->next_pid,
1145 field->next_prio,
1146 T);
1147
1148 return trace_handle_return(&iter->seq);
1149}
1150
1151static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
1152 struct trace_event *event)
1153{
1154 return trace_ctxwake_raw(iter, 0);
1155}
1156
1157static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
1158 struct trace_event *event)
1159{
1160 return trace_ctxwake_raw(iter, '+');
1161}
1162
1163
1164static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
1165{
1166 struct ctx_switch_entry *field;
1167 struct trace_seq *s = &iter->seq;
1168 int T;
1169
1170 trace_assign_type(field, iter->ent);
1171
1172 if (!S)
1173 S = task_index_to_char(field->prev_state);
1174 T = task_index_to_char(field->next_state);
1175
1176 SEQ_PUT_HEX_FIELD(s, field->prev_pid);
1177 SEQ_PUT_HEX_FIELD(s, field->prev_prio);
1178 SEQ_PUT_HEX_FIELD(s, S);
1179 SEQ_PUT_HEX_FIELD(s, field->next_cpu);
1180 SEQ_PUT_HEX_FIELD(s, field->next_pid);
1181 SEQ_PUT_HEX_FIELD(s, field->next_prio);
1182 SEQ_PUT_HEX_FIELD(s, T);
1183
1184 return trace_handle_return(s);
1185}
1186
1187static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1188 struct trace_event *event)
1189{
1190 return trace_ctxwake_hex(iter, 0);
1191}
1192
1193static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1194 struct trace_event *event)
1195{
1196 return trace_ctxwake_hex(iter, '+');
1197}
1198
1199static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1200 int flags, struct trace_event *event)
1201{
1202 struct ctx_switch_entry *field;
1203 struct trace_seq *s = &iter->seq;
1204
1205 trace_assign_type(field, iter->ent);
1206
1207 SEQ_PUT_FIELD(s, field->prev_pid);
1208 SEQ_PUT_FIELD(s, field->prev_prio);
1209 SEQ_PUT_FIELD(s, field->prev_state);
1210 SEQ_PUT_FIELD(s, field->next_cpu);
1211 SEQ_PUT_FIELD(s, field->next_pid);
1212 SEQ_PUT_FIELD(s, field->next_prio);
1213 SEQ_PUT_FIELD(s, field->next_state);
1214
1215 return trace_handle_return(s);
1216}
1217
1218static struct trace_event_functions trace_ctx_funcs = {
1219 .trace = trace_ctx_print,
1220 .raw = trace_ctx_raw,
1221 .hex = trace_ctx_hex,
1222 .binary = trace_ctxwake_bin,
1223};
1224
1225static struct trace_event trace_ctx_event = {
1226 .type = TRACE_CTX,
1227 .funcs = &trace_ctx_funcs,
1228};
1229
1230static struct trace_event_functions trace_wake_funcs = {
1231 .trace = trace_wake_print,
1232 .raw = trace_wake_raw,
1233 .hex = trace_wake_hex,
1234 .binary = trace_ctxwake_bin,
1235};
1236
1237static struct trace_event trace_wake_event = {
1238 .type = TRACE_WAKE,
1239 .funcs = &trace_wake_funcs,
1240};
1241
1242/* TRACE_STACK */
1243
1244static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1245 int flags, struct trace_event *event)
1246{
1247 struct stack_entry *field;
1248 struct trace_seq *s = &iter->seq;
1249 unsigned long *p;
1250 unsigned long *end;
1251 long delta = iter->tr->text_delta;
1252
1253 trace_assign_type(field, iter->ent);
1254 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1255
1256 trace_seq_puts(s, "<stack trace>\n");
1257
1258 for (p = field->caller; p && p < end && *p != ULONG_MAX; p++) {
1259
1260 if (trace_seq_has_overflowed(s))
1261 break;
1262
1263 trace_seq_puts(s, " => ");
1264 if ((*p) == FTRACE_TRAMPOLINE_MARKER) {
1265 trace_seq_puts(s, "[FTRACE TRAMPOLINE]\n");
1266 continue;
1267 }
1268 seq_print_ip_sym(s, (*p) + delta, flags);
1269 trace_seq_putc(s, '\n');
1270 }
1271
1272 return trace_handle_return(s);
1273}
1274
1275static struct trace_event_functions trace_stack_funcs = {
1276 .trace = trace_stack_print,
1277};
1278
1279static struct trace_event trace_stack_event = {
1280 .type = TRACE_STACK,
1281 .funcs = &trace_stack_funcs,
1282};
1283
1284/* TRACE_USER_STACK */
1285static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1286 int flags, struct trace_event *event)
1287{
1288 struct trace_array *tr = iter->tr;
1289 struct userstack_entry *field;
1290 struct trace_seq *s = &iter->seq;
1291 struct mm_struct *mm = NULL;
1292 unsigned int i;
1293
1294 trace_assign_type(field, iter->ent);
1295
1296 trace_seq_puts(s, "<user stack trace>\n");
1297
1298 if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
1299 struct task_struct *task;
1300 /*
1301 * we do the lookup on the thread group leader,
1302 * since individual threads might have already quit!
1303 */
1304 rcu_read_lock();
1305 task = find_task_by_vpid(field->tgid);
1306 if (task)
1307 mm = get_task_mm(task);
1308 rcu_read_unlock();
1309 }
1310
1311 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1312 unsigned long ip = field->caller[i];
1313
1314 if (!ip || trace_seq_has_overflowed(s))
1315 break;
1316
1317 trace_seq_puts(s, " => ");
1318 seq_print_user_ip(s, mm, ip, flags);
1319 trace_seq_putc(s, '\n');
1320 }
1321
1322 if (mm)
1323 mmput(mm);
1324
1325 return trace_handle_return(s);
1326}
1327
1328static struct trace_event_functions trace_user_stack_funcs = {
1329 .trace = trace_user_stack_print,
1330};
1331
1332static struct trace_event trace_user_stack_event = {
1333 .type = TRACE_USER_STACK,
1334 .funcs = &trace_user_stack_funcs,
1335};
1336
1337/* TRACE_HWLAT */
1338static enum print_line_t
1339trace_hwlat_print(struct trace_iterator *iter, int flags,
1340 struct trace_event *event)
1341{
1342 struct trace_entry *entry = iter->ent;
1343 struct trace_seq *s = &iter->seq;
1344 struct hwlat_entry *field;
1345
1346 trace_assign_type(field, entry);
1347
1348 trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld count:%d",
1349 field->seqnum,
1350 field->duration,
1351 field->outer_duration,
1352 (long long)field->timestamp.tv_sec,
1353 field->timestamp.tv_nsec, field->count);
1354
1355 if (field->nmi_count) {
1356 /*
1357 * The generic sched_clock() is not NMI safe, thus
1358 * we only record the count and not the time.
1359 */
1360 if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK))
1361 trace_seq_printf(s, " nmi-total:%llu",
1362 field->nmi_total_ts);
1363 trace_seq_printf(s, " nmi-count:%u",
1364 field->nmi_count);
1365 }
1366
1367 trace_seq_putc(s, '\n');
1368
1369 return trace_handle_return(s);
1370}
1371
1372static enum print_line_t
1373trace_hwlat_raw(struct trace_iterator *iter, int flags,
1374 struct trace_event *event)
1375{
1376 struct hwlat_entry *field;
1377 struct trace_seq *s = &iter->seq;
1378
1379 trace_assign_type(field, iter->ent);
1380
1381 trace_seq_printf(s, "%llu %lld %lld %09ld %u\n",
1382 field->duration,
1383 field->outer_duration,
1384 (long long)field->timestamp.tv_sec,
1385 field->timestamp.tv_nsec,
1386 field->seqnum);
1387
1388 return trace_handle_return(s);
1389}
1390
1391static struct trace_event_functions trace_hwlat_funcs = {
1392 .trace = trace_hwlat_print,
1393 .raw = trace_hwlat_raw,
1394};
1395
1396static struct trace_event trace_hwlat_event = {
1397 .type = TRACE_HWLAT,
1398 .funcs = &trace_hwlat_funcs,
1399};
1400
1401/* TRACE_OSNOISE */
1402static enum print_line_t
1403trace_osnoise_print(struct trace_iterator *iter, int flags,
1404 struct trace_event *event)
1405{
1406 struct trace_entry *entry = iter->ent;
1407 struct trace_seq *s = &iter->seq;
1408 struct osnoise_entry *field;
1409 u64 ratio, ratio_dec;
1410 u64 net_runtime;
1411
1412 trace_assign_type(field, entry);
1413
1414 /*
1415 * compute the available % of cpu time.
1416 */
1417 net_runtime = field->runtime - field->noise;
1418 ratio = net_runtime * 10000000;
1419 do_div(ratio, field->runtime);
1420 ratio_dec = do_div(ratio, 100000);
1421
1422 trace_seq_printf(s, "%llu %10llu %3llu.%05llu %7llu",
1423 field->runtime,
1424 field->noise,
1425 ratio, ratio_dec,
1426 field->max_sample);
1427
1428 trace_seq_printf(s, " %6u", field->hw_count);
1429 trace_seq_printf(s, " %6u", field->nmi_count);
1430 trace_seq_printf(s, " %6u", field->irq_count);
1431 trace_seq_printf(s, " %6u", field->softirq_count);
1432 trace_seq_printf(s, " %6u", field->thread_count);
1433
1434 trace_seq_putc(s, '\n');
1435
1436 return trace_handle_return(s);
1437}
1438
1439static enum print_line_t
1440trace_osnoise_raw(struct trace_iterator *iter, int flags,
1441 struct trace_event *event)
1442{
1443 struct osnoise_entry *field;
1444 struct trace_seq *s = &iter->seq;
1445
1446 trace_assign_type(field, iter->ent);
1447
1448 trace_seq_printf(s, "%lld %llu %llu %u %u %u %u %u\n",
1449 field->runtime,
1450 field->noise,
1451 field->max_sample,
1452 field->hw_count,
1453 field->nmi_count,
1454 field->irq_count,
1455 field->softirq_count,
1456 field->thread_count);
1457
1458 return trace_handle_return(s);
1459}
1460
1461static struct trace_event_functions trace_osnoise_funcs = {
1462 .trace = trace_osnoise_print,
1463 .raw = trace_osnoise_raw,
1464};
1465
1466static struct trace_event trace_osnoise_event = {
1467 .type = TRACE_OSNOISE,
1468 .funcs = &trace_osnoise_funcs,
1469};
1470
1471/* TRACE_TIMERLAT */
1472
1473static char *timerlat_lat_context[] = {"irq", "thread", "user-ret"};
1474static enum print_line_t
1475trace_timerlat_print(struct trace_iterator *iter, int flags,
1476 struct trace_event *event)
1477{
1478 struct trace_entry *entry = iter->ent;
1479 struct trace_seq *s = &iter->seq;
1480 struct timerlat_entry *field;
1481
1482 trace_assign_type(field, entry);
1483
1484 trace_seq_printf(s, "#%-5u context %6s timer_latency %9llu ns\n",
1485 field->seqnum,
1486 timerlat_lat_context[field->context],
1487 field->timer_latency);
1488
1489 return trace_handle_return(s);
1490}
1491
1492static enum print_line_t
1493trace_timerlat_raw(struct trace_iterator *iter, int flags,
1494 struct trace_event *event)
1495{
1496 struct timerlat_entry *field;
1497 struct trace_seq *s = &iter->seq;
1498
1499 trace_assign_type(field, iter->ent);
1500
1501 trace_seq_printf(s, "%u %d %llu\n",
1502 field->seqnum,
1503 field->context,
1504 field->timer_latency);
1505
1506 return trace_handle_return(s);
1507}
1508
1509static struct trace_event_functions trace_timerlat_funcs = {
1510 .trace = trace_timerlat_print,
1511 .raw = trace_timerlat_raw,
1512};
1513
1514static struct trace_event trace_timerlat_event = {
1515 .type = TRACE_TIMERLAT,
1516 .funcs = &trace_timerlat_funcs,
1517};
1518
1519/* TRACE_BPUTS */
1520static enum print_line_t
1521trace_bputs_print(struct trace_iterator *iter, int flags,
1522 struct trace_event *event)
1523{
1524 struct trace_entry *entry = iter->ent;
1525 struct trace_seq *s = &iter->seq;
1526 struct bputs_entry *field;
1527
1528 trace_assign_type(field, entry);
1529
1530 seq_print_ip_sym(s, field->ip, flags);
1531 trace_seq_puts(s, ": ");
1532 trace_seq_puts(s, field->str);
1533
1534 return trace_handle_return(s);
1535}
1536
1537
1538static enum print_line_t
1539trace_bputs_raw(struct trace_iterator *iter, int flags,
1540 struct trace_event *event)
1541{
1542 struct bputs_entry *field;
1543 struct trace_seq *s = &iter->seq;
1544
1545 trace_assign_type(field, iter->ent);
1546
1547 trace_seq_printf(s, ": %lx : ", field->ip);
1548 trace_seq_puts(s, field->str);
1549
1550 return trace_handle_return(s);
1551}
1552
1553static struct trace_event_functions trace_bputs_funcs = {
1554 .trace = trace_bputs_print,
1555 .raw = trace_bputs_raw,
1556};
1557
1558static struct trace_event trace_bputs_event = {
1559 .type = TRACE_BPUTS,
1560 .funcs = &trace_bputs_funcs,
1561};
1562
1563/* TRACE_BPRINT */
1564static enum print_line_t
1565trace_bprint_print(struct trace_iterator *iter, int flags,
1566 struct trace_event *event)
1567{
1568 struct trace_entry *entry = iter->ent;
1569 struct trace_seq *s = &iter->seq;
1570 struct bprint_entry *field;
1571
1572 trace_assign_type(field, entry);
1573
1574 seq_print_ip_sym(s, field->ip, flags);
1575 trace_seq_puts(s, ": ");
1576 trace_seq_bprintf(s, field->fmt, field->buf);
1577
1578 return trace_handle_return(s);
1579}
1580
1581
1582static enum print_line_t
1583trace_bprint_raw(struct trace_iterator *iter, int flags,
1584 struct trace_event *event)
1585{
1586 struct bprint_entry *field;
1587 struct trace_seq *s = &iter->seq;
1588
1589 trace_assign_type(field, iter->ent);
1590
1591 trace_seq_printf(s, ": %lx : ", field->ip);
1592 trace_seq_bprintf(s, field->fmt, field->buf);
1593
1594 return trace_handle_return(s);
1595}
1596
1597static struct trace_event_functions trace_bprint_funcs = {
1598 .trace = trace_bprint_print,
1599 .raw = trace_bprint_raw,
1600};
1601
1602static struct trace_event trace_bprint_event = {
1603 .type = TRACE_BPRINT,
1604 .funcs = &trace_bprint_funcs,
1605};
1606
1607/* TRACE_PRINT */
1608static enum print_line_t trace_print_print(struct trace_iterator *iter,
1609 int flags, struct trace_event *event)
1610{
1611 struct print_entry *field;
1612 struct trace_seq *s = &iter->seq;
1613 unsigned long ip;
1614
1615 trace_assign_type(field, iter->ent);
1616
1617 ip = field->ip + iter->tr->text_delta;
1618
1619 seq_print_ip_sym(s, ip, flags);
1620 trace_seq_printf(s, ": %s", field->buf);
1621
1622 return trace_handle_return(s);
1623}
1624
1625static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1626 struct trace_event *event)
1627{
1628 struct print_entry *field;
1629
1630 trace_assign_type(field, iter->ent);
1631
1632 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1633
1634 return trace_handle_return(&iter->seq);
1635}
1636
1637static struct trace_event_functions trace_print_funcs = {
1638 .trace = trace_print_print,
1639 .raw = trace_print_raw,
1640};
1641
1642static struct trace_event trace_print_event = {
1643 .type = TRACE_PRINT,
1644 .funcs = &trace_print_funcs,
1645};
1646
1647static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags,
1648 struct trace_event *event)
1649{
1650 struct raw_data_entry *field;
1651 int i;
1652
1653 trace_assign_type(field, iter->ent);
1654
1655 trace_seq_printf(&iter->seq, "# %x buf:", field->id);
1656
1657 for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++)
1658 trace_seq_printf(&iter->seq, " %02x",
1659 (unsigned char)field->buf[i]);
1660
1661 trace_seq_putc(&iter->seq, '\n');
1662
1663 return trace_handle_return(&iter->seq);
1664}
1665
1666static struct trace_event_functions trace_raw_data_funcs = {
1667 .trace = trace_raw_data,
1668 .raw = trace_raw_data,
1669};
1670
1671static struct trace_event trace_raw_data_event = {
1672 .type = TRACE_RAW_DATA,
1673 .funcs = &trace_raw_data_funcs,
1674};
1675
1676static enum print_line_t
1677trace_func_repeats_raw(struct trace_iterator *iter, int flags,
1678 struct trace_event *event)
1679{
1680 struct func_repeats_entry *field;
1681 struct trace_seq *s = &iter->seq;
1682
1683 trace_assign_type(field, iter->ent);
1684
1685 trace_seq_printf(s, "%lu %lu %u %llu\n",
1686 field->ip,
1687 field->parent_ip,
1688 field->count,
1689 FUNC_REPEATS_GET_DELTA_TS(field));
1690
1691 return trace_handle_return(s);
1692}
1693
1694static enum print_line_t
1695trace_func_repeats_print(struct trace_iterator *iter, int flags,
1696 struct trace_event *event)
1697{
1698 struct func_repeats_entry *field;
1699 struct trace_seq *s = &iter->seq;
1700
1701 trace_assign_type(field, iter->ent);
1702
1703 print_fn_trace(s, field->ip, field->parent_ip, iter->tr->text_delta, flags);
1704 trace_seq_printf(s, " (repeats: %u, last_ts:", field->count);
1705 trace_print_time(s, iter,
1706 iter->ts - FUNC_REPEATS_GET_DELTA_TS(field));
1707 trace_seq_puts(s, ")\n");
1708
1709 return trace_handle_return(s);
1710}
1711
1712static struct trace_event_functions trace_func_repeats_funcs = {
1713 .trace = trace_func_repeats_print,
1714 .raw = trace_func_repeats_raw,
1715};
1716
1717static struct trace_event trace_func_repeats_event = {
1718 .type = TRACE_FUNC_REPEATS,
1719 .funcs = &trace_func_repeats_funcs,
1720};
1721
1722static struct trace_event *events[] __initdata = {
1723 &trace_fn_event,
1724 &trace_ctx_event,
1725 &trace_wake_event,
1726 &trace_stack_event,
1727 &trace_user_stack_event,
1728 &trace_bputs_event,
1729 &trace_bprint_event,
1730 &trace_print_event,
1731 &trace_hwlat_event,
1732 &trace_osnoise_event,
1733 &trace_timerlat_event,
1734 &trace_raw_data_event,
1735 &trace_func_repeats_event,
1736 NULL
1737};
1738
1739__init int init_events(void)
1740{
1741 struct trace_event *event;
1742 int i, ret;
1743
1744 for (i = 0; events[i]; i++) {
1745 event = events[i];
1746 ret = register_trace_event(event);
1747 WARN_ONCE(!ret, "event %d failed to register", event->type);
1748 }
1749
1750 return 0;
1751}
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_mutex);
18
19static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
20
21static int next_event_type = __TRACE_LAST_TYPE + 1;
22
23int trace_print_seq(struct seq_file *m, struct trace_seq *s)
24{
25 int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;
26 int ret;
27
28 ret = seq_write(m, s->buffer, len);
29
30 /*
31 * Only reset this buffer if we successfully wrote to the
32 * seq_file buffer.
33 */
34 if (!ret)
35 trace_seq_init(s);
36
37 return ret;
38}
39
40enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
41{
42 struct trace_seq *s = &iter->seq;
43 struct trace_entry *entry = iter->ent;
44 struct bprint_entry *field;
45 int ret;
46
47 trace_assign_type(field, entry);
48
49 ret = trace_seq_bprintf(s, field->fmt, field->buf);
50 if (!ret)
51 return TRACE_TYPE_PARTIAL_LINE;
52
53 return TRACE_TYPE_HANDLED;
54}
55
56enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
57{
58 struct trace_seq *s = &iter->seq;
59 struct trace_entry *entry = iter->ent;
60 struct print_entry *field;
61 int ret;
62
63 trace_assign_type(field, entry);
64
65 ret = trace_seq_printf(s, "%s", field->buf);
66 if (!ret)
67 return TRACE_TYPE_PARTIAL_LINE;
68
69 return TRACE_TYPE_HANDLED;
70}
71
72/**
73 * trace_seq_printf - sequence printing of trace information
74 * @s: trace sequence descriptor
75 * @fmt: printf format string
76 *
77 * It returns 0 if the trace oversizes the buffer's free
78 * space, 1 otherwise.
79 *
80 * The tracer may use either sequence operations or its own
81 * copy to user routines. To simplify formating of a trace
82 * trace_seq_printf is used to store strings into a special
83 * buffer (@s). Then the output may be either used by
84 * the sequencer or pulled into another buffer.
85 */
86int
87trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
88{
89 int len = (PAGE_SIZE - 1) - s->len;
90 va_list ap;
91 int ret;
92
93 if (s->full || !len)
94 return 0;
95
96 va_start(ap, fmt);
97 ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
98 va_end(ap);
99
100 /* If we can't write it all, don't bother writing anything */
101 if (ret >= len) {
102 s->full = 1;
103 return 0;
104 }
105
106 s->len += ret;
107
108 return 1;
109}
110EXPORT_SYMBOL_GPL(trace_seq_printf);
111
112/**
113 * trace_seq_vprintf - sequence printing of trace information
114 * @s: trace sequence descriptor
115 * @fmt: printf format string
116 *
117 * The tracer may use either sequence operations or its own
118 * copy to user routines. To simplify formating of a trace
119 * trace_seq_printf is used to store strings into a special
120 * buffer (@s). Then the output may be either used by
121 * the sequencer or pulled into another buffer.
122 */
123int
124trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
125{
126 int len = (PAGE_SIZE - 1) - s->len;
127 int ret;
128
129 if (s->full || !len)
130 return 0;
131
132 ret = vsnprintf(s->buffer + s->len, len, fmt, args);
133
134 /* If we can't write it all, don't bother writing anything */
135 if (ret >= len) {
136 s->full = 1;
137 return 0;
138 }
139
140 s->len += ret;
141
142 return len;
143}
144EXPORT_SYMBOL_GPL(trace_seq_vprintf);
145
146int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
147{
148 int len = (PAGE_SIZE - 1) - s->len;
149 int ret;
150
151 if (s->full || !len)
152 return 0;
153
154 ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
155
156 /* If we can't write it all, don't bother writing anything */
157 if (ret >= len) {
158 s->full = 1;
159 return 0;
160 }
161
162 s->len += ret;
163
164 return len;
165}
166
167/**
168 * trace_seq_puts - trace sequence printing of simple string
169 * @s: trace sequence descriptor
170 * @str: simple string to record
171 *
172 * The tracer may use either the sequence operations or its own
173 * copy to user routines. This function records a simple string
174 * into a special buffer (@s) for later retrieval by a sequencer
175 * or other mechanism.
176 */
177int trace_seq_puts(struct trace_seq *s, const char *str)
178{
179 int len = strlen(str);
180
181 if (s->full)
182 return 0;
183
184 if (len > ((PAGE_SIZE - 1) - s->len)) {
185 s->full = 1;
186 return 0;
187 }
188
189 memcpy(s->buffer + s->len, str, len);
190 s->len += len;
191
192 return len;
193}
194
195int trace_seq_putc(struct trace_seq *s, unsigned char c)
196{
197 if (s->full)
198 return 0;
199
200 if (s->len >= (PAGE_SIZE - 1)) {
201 s->full = 1;
202 return 0;
203 }
204
205 s->buffer[s->len++] = c;
206
207 return 1;
208}
209EXPORT_SYMBOL(trace_seq_putc);
210
211int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
212{
213 if (s->full)
214 return 0;
215
216 if (len > ((PAGE_SIZE - 1) - s->len)) {
217 s->full = 1;
218 return 0;
219 }
220
221 memcpy(s->buffer + s->len, mem, len);
222 s->len += len;
223
224 return len;
225}
226
227int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
228{
229 unsigned char hex[HEX_CHARS];
230 const unsigned char *data = mem;
231 int i, j;
232
233 if (s->full)
234 return 0;
235
236#ifdef __BIG_ENDIAN
237 for (i = 0, j = 0; i < len; i++) {
238#else
239 for (i = len-1, j = 0; i >= 0; i--) {
240#endif
241 hex[j++] = hex_asc_hi(data[i]);
242 hex[j++] = hex_asc_lo(data[i]);
243 }
244 hex[j++] = ' ';
245
246 return trace_seq_putmem(s, hex, j);
247}
248
249void *trace_seq_reserve(struct trace_seq *s, size_t len)
250{
251 void *ret;
252
253 if (s->full)
254 return NULL;
255
256 if (len > ((PAGE_SIZE - 1) - s->len)) {
257 s->full = 1;
258 return NULL;
259 }
260
261 ret = s->buffer + s->len;
262 s->len += len;
263
264 return ret;
265}
266
267int trace_seq_path(struct trace_seq *s, struct path *path)
268{
269 unsigned char *p;
270
271 if (s->full)
272 return 0;
273
274 if (s->len >= (PAGE_SIZE - 1)) {
275 s->full = 1;
276 return 0;
277 }
278
279 p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
280 if (!IS_ERR(p)) {
281 p = mangle_path(s->buffer + s->len, p, "\n");
282 if (p) {
283 s->len = p - s->buffer;
284 return 1;
285 }
286 } else {
287 s->buffer[s->len++] = '?';
288 return 1;
289 }
290
291 s->full = 1;
292 return 0;
293}
294
295const char *
296ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
297 unsigned long flags,
298 const struct trace_print_flags *flag_array)
299{
300 unsigned long mask;
301 const char *str;
302 const char *ret = p->buffer + p->len;
303 int i;
304
305 for (i = 0; flag_array[i].name && flags; i++) {
306
307 mask = flag_array[i].mask;
308 if ((flags & mask) != mask)
309 continue;
310
311 str = flag_array[i].name;
312 flags &= ~mask;
313 if (p->len && delim)
314 trace_seq_puts(p, delim);
315 trace_seq_puts(p, str);
316 }
317
318 /* check for left over flags */
319 if (flags) {
320 if (p->len && delim)
321 trace_seq_puts(p, delim);
322 trace_seq_printf(p, "0x%lx", flags);
323 }
324
325 trace_seq_putc(p, 0);
326
327 return ret;
328}
329EXPORT_SYMBOL(ftrace_print_flags_seq);
330
331const char *
332ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
333 const struct trace_print_flags *symbol_array)
334{
335 int i;
336 const char *ret = p->buffer + p->len;
337
338 for (i = 0; symbol_array[i].name; i++) {
339
340 if (val != symbol_array[i].mask)
341 continue;
342
343 trace_seq_puts(p, symbol_array[i].name);
344 break;
345 }
346
347 if (!p->len)
348 trace_seq_printf(p, "0x%lx", val);
349
350 trace_seq_putc(p, 0);
351
352 return ret;
353}
354EXPORT_SYMBOL(ftrace_print_symbols_seq);
355
356#if BITS_PER_LONG == 32
357const char *
358ftrace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
359 const struct trace_print_flags_u64 *symbol_array)
360{
361 int i;
362 const char *ret = p->buffer + p->len;
363
364 for (i = 0; symbol_array[i].name; i++) {
365
366 if (val != symbol_array[i].mask)
367 continue;
368
369 trace_seq_puts(p, symbol_array[i].name);
370 break;
371 }
372
373 if (!p->len)
374 trace_seq_printf(p, "0x%llx", val);
375
376 trace_seq_putc(p, 0);
377
378 return ret;
379}
380EXPORT_SYMBOL(ftrace_print_symbols_seq_u64);
381#endif
382
383const char *
384ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
385{
386 int i;
387 const char *ret = p->buffer + p->len;
388
389 for (i = 0; i < buf_len; i++)
390 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
391
392 trace_seq_putc(p, 0);
393
394 return ret;
395}
396EXPORT_SYMBOL(ftrace_print_hex_seq);
397
398#ifdef CONFIG_KRETPROBES
399static inline const char *kretprobed(const char *name)
400{
401 static const char tramp_name[] = "kretprobe_trampoline";
402 int size = sizeof(tramp_name);
403
404 if (strncmp(tramp_name, name, size) == 0)
405 return "[unknown/kretprobe'd]";
406 return name;
407}
408#else
409static inline const char *kretprobed(const char *name)
410{
411 return name;
412}
413#endif /* CONFIG_KRETPROBES */
414
415static int
416seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
417{
418#ifdef CONFIG_KALLSYMS
419 char str[KSYM_SYMBOL_LEN];
420 const char *name;
421
422 kallsyms_lookup(address, NULL, NULL, NULL, str);
423
424 name = kretprobed(str);
425
426 return trace_seq_printf(s, fmt, name);
427#endif
428 return 1;
429}
430
431static int
432seq_print_sym_offset(struct trace_seq *s, const char *fmt,
433 unsigned long address)
434{
435#ifdef CONFIG_KALLSYMS
436 char str[KSYM_SYMBOL_LEN];
437 const char *name;
438
439 sprint_symbol(str, address);
440 name = kretprobed(str);
441
442 return trace_seq_printf(s, fmt, name);
443#endif
444 return 1;
445}
446
447#ifndef CONFIG_64BIT
448# define IP_FMT "%08lx"
449#else
450# define IP_FMT "%016lx"
451#endif
452
453int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
454 unsigned long ip, unsigned long sym_flags)
455{
456 struct file *file = NULL;
457 unsigned long vmstart = 0;
458 int ret = 1;
459
460 if (s->full)
461 return 0;
462
463 if (mm) {
464 const struct vm_area_struct *vma;
465
466 down_read(&mm->mmap_sem);
467 vma = find_vma(mm, ip);
468 if (vma) {
469 file = vma->vm_file;
470 vmstart = vma->vm_start;
471 }
472 if (file) {
473 ret = trace_seq_path(s, &file->f_path);
474 if (ret)
475 ret = trace_seq_printf(s, "[+0x%lx]",
476 ip - vmstart);
477 }
478 up_read(&mm->mmap_sem);
479 }
480 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
481 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
482 return ret;
483}
484
485int
486seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
487 unsigned long sym_flags)
488{
489 struct mm_struct *mm = NULL;
490 int ret = 1;
491 unsigned int i;
492
493 if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
494 struct task_struct *task;
495 /*
496 * we do the lookup on the thread group leader,
497 * since individual threads might have already quit!
498 */
499 rcu_read_lock();
500 task = find_task_by_vpid(entry->tgid);
501 if (task)
502 mm = get_task_mm(task);
503 rcu_read_unlock();
504 }
505
506 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
507 unsigned long ip = entry->caller[i];
508
509 if (ip == ULONG_MAX || !ret)
510 break;
511 if (ret)
512 ret = trace_seq_puts(s, " => ");
513 if (!ip) {
514 if (ret)
515 ret = trace_seq_puts(s, "??");
516 if (ret)
517 ret = trace_seq_puts(s, "\n");
518 continue;
519 }
520 if (!ret)
521 break;
522 if (ret)
523 ret = seq_print_user_ip(s, mm, ip, sym_flags);
524 ret = trace_seq_puts(s, "\n");
525 }
526
527 if (mm)
528 mmput(mm);
529 return ret;
530}
531
532int
533seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
534{
535 int ret;
536
537 if (!ip)
538 return trace_seq_printf(s, "0");
539
540 if (sym_flags & TRACE_ITER_SYM_OFFSET)
541 ret = seq_print_sym_offset(s, "%s", ip);
542 else
543 ret = seq_print_sym_short(s, "%s", ip);
544
545 if (!ret)
546 return 0;
547
548 if (sym_flags & TRACE_ITER_SYM_ADDR)
549 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
550 return ret;
551}
552
553/**
554 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
555 * @s: trace seq struct to write to
556 * @entry: The trace entry field from the ring buffer
557 *
558 * Prints the generic fields of irqs off, in hard or softirq, preempt
559 * count.
560 */
561int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
562{
563 char hardsoft_irq;
564 char need_resched;
565 char irqs_off;
566 int hardirq;
567 int softirq;
568 int ret;
569
570 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
571 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
572
573 irqs_off =
574 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
575 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
576 '.';
577 need_resched =
578 (entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.';
579 hardsoft_irq =
580 (hardirq && softirq) ? 'H' :
581 hardirq ? 'h' :
582 softirq ? 's' :
583 '.';
584
585 if (!trace_seq_printf(s, "%c%c%c",
586 irqs_off, need_resched, hardsoft_irq))
587 return 0;
588
589 if (entry->preempt_count)
590 ret = trace_seq_printf(s, "%x", entry->preempt_count);
591 else
592 ret = trace_seq_putc(s, '.');
593
594 return ret;
595}
596
597static int
598lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
599{
600 char comm[TASK_COMM_LEN];
601
602 trace_find_cmdline(entry->pid, comm);
603
604 if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
605 comm, entry->pid, cpu))
606 return 0;
607
608 return trace_print_lat_fmt(s, entry);
609}
610
611static unsigned long preempt_mark_thresh = 100;
612
613static int
614lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
615 unsigned long rel_usecs)
616{
617 return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
618 rel_usecs > preempt_mark_thresh ? '!' :
619 rel_usecs > 1 ? '+' : ' ');
620}
621
622int trace_print_context(struct trace_iterator *iter)
623{
624 struct trace_seq *s = &iter->seq;
625 struct trace_entry *entry = iter->ent;
626 unsigned long long t = ns2usecs(iter->ts);
627 unsigned long usec_rem = do_div(t, USEC_PER_SEC);
628 unsigned long secs = (unsigned long)t;
629 char comm[TASK_COMM_LEN];
630
631 trace_find_cmdline(entry->pid, comm);
632
633 return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
634 comm, entry->pid, iter->cpu, secs, usec_rem);
635}
636
637int trace_print_lat_context(struct trace_iterator *iter)
638{
639 u64 next_ts;
640 int ret;
641 struct trace_seq *s = &iter->seq;
642 struct trace_entry *entry = iter->ent,
643 *next_entry = trace_find_next_entry(iter, NULL,
644 &next_ts);
645 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
646 unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
647 unsigned long rel_usecs;
648
649 if (!next_entry)
650 next_ts = iter->ts;
651 rel_usecs = ns2usecs(next_ts - iter->ts);
652
653 if (verbose) {
654 char comm[TASK_COMM_LEN];
655
656 trace_find_cmdline(entry->pid, comm);
657
658 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
659 " %ld.%03ldms (+%ld.%03ldms): ", comm,
660 entry->pid, iter->cpu, entry->flags,
661 entry->preempt_count, iter->idx,
662 ns2usecs(iter->ts),
663 abs_usecs / USEC_PER_MSEC,
664 abs_usecs % USEC_PER_MSEC,
665 rel_usecs / USEC_PER_MSEC,
666 rel_usecs % USEC_PER_MSEC);
667 } else {
668 ret = lat_print_generic(s, entry, iter->cpu);
669 if (ret)
670 ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
671 }
672
673 return ret;
674}
675
676static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
677
678static int task_state_char(unsigned long state)
679{
680 int bit = state ? __ffs(state) + 1 : 0;
681
682 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
683}
684
685/**
686 * ftrace_find_event - find a registered event
687 * @type: the type of event to look for
688 *
689 * Returns an event of type @type otherwise NULL
690 * Called with trace_event_read_lock() held.
691 */
692struct trace_event *ftrace_find_event(int type)
693{
694 struct trace_event *event;
695 struct hlist_node *n;
696 unsigned key;
697
698 key = type & (EVENT_HASHSIZE - 1);
699
700 hlist_for_each_entry(event, n, &event_hash[key], node) {
701 if (event->type == type)
702 return event;
703 }
704
705 return NULL;
706}
707
708static LIST_HEAD(ftrace_event_list);
709
710static int trace_search_list(struct list_head **list)
711{
712 struct trace_event *e;
713 int last = __TRACE_LAST_TYPE;
714
715 if (list_empty(&ftrace_event_list)) {
716 *list = &ftrace_event_list;
717 return last + 1;
718 }
719
720 /*
721 * We used up all possible max events,
722 * lets see if somebody freed one.
723 */
724 list_for_each_entry(e, &ftrace_event_list, list) {
725 if (e->type != last + 1)
726 break;
727 last++;
728 }
729
730 /* Did we used up all 65 thousand events??? */
731 if ((last + 1) > FTRACE_MAX_EVENT)
732 return 0;
733
734 *list = &e->list;
735 return last + 1;
736}
737
738void trace_event_read_lock(void)
739{
740 down_read(&trace_event_mutex);
741}
742
743void trace_event_read_unlock(void)
744{
745 up_read(&trace_event_mutex);
746}
747
748/**
749 * register_ftrace_event - register output for an event type
750 * @event: the event type to register
751 *
752 * Event types are stored in a hash and this hash is used to
753 * find a way to print an event. If the @event->type is set
754 * then it will use that type, otherwise it will assign a
755 * type to use.
756 *
757 * If you assign your own type, please make sure it is added
758 * to the trace_type enum in trace.h, to avoid collisions
759 * with the dynamic types.
760 *
761 * Returns the event type number or zero on error.
762 */
763int register_ftrace_event(struct trace_event *event)
764{
765 unsigned key;
766 int ret = 0;
767
768 down_write(&trace_event_mutex);
769
770 if (WARN_ON(!event))
771 goto out;
772
773 if (WARN_ON(!event->funcs))
774 goto out;
775
776 INIT_LIST_HEAD(&event->list);
777
778 if (!event->type) {
779 struct list_head *list = NULL;
780
781 if (next_event_type > FTRACE_MAX_EVENT) {
782
783 event->type = trace_search_list(&list);
784 if (!event->type)
785 goto out;
786
787 } else {
788
789 event->type = next_event_type++;
790 list = &ftrace_event_list;
791 }
792
793 if (WARN_ON(ftrace_find_event(event->type)))
794 goto out;
795
796 list_add_tail(&event->list, list);
797
798 } else if (event->type > __TRACE_LAST_TYPE) {
799 printk(KERN_WARNING "Need to add type to trace.h\n");
800 WARN_ON(1);
801 goto out;
802 } else {
803 /* Is this event already used */
804 if (ftrace_find_event(event->type))
805 goto out;
806 }
807
808 if (event->funcs->trace == NULL)
809 event->funcs->trace = trace_nop_print;
810 if (event->funcs->raw == NULL)
811 event->funcs->raw = trace_nop_print;
812 if (event->funcs->hex == NULL)
813 event->funcs->hex = trace_nop_print;
814 if (event->funcs->binary == NULL)
815 event->funcs->binary = trace_nop_print;
816
817 key = event->type & (EVENT_HASHSIZE - 1);
818
819 hlist_add_head(&event->node, &event_hash[key]);
820
821 ret = event->type;
822 out:
823 up_write(&trace_event_mutex);
824
825 return ret;
826}
827EXPORT_SYMBOL_GPL(register_ftrace_event);
828
829/*
830 * Used by module code with the trace_event_mutex held for write.
831 */
832int __unregister_ftrace_event(struct trace_event *event)
833{
834 hlist_del(&event->node);
835 list_del(&event->list);
836 return 0;
837}
838
839/**
840 * unregister_ftrace_event - remove a no longer used event
841 * @event: the event to remove
842 */
843int unregister_ftrace_event(struct trace_event *event)
844{
845 down_write(&trace_event_mutex);
846 __unregister_ftrace_event(event);
847 up_write(&trace_event_mutex);
848
849 return 0;
850}
851EXPORT_SYMBOL_GPL(unregister_ftrace_event);
852
853/*
854 * Standard events
855 */
856
857enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
858 struct trace_event *event)
859{
860 if (!trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type))
861 return TRACE_TYPE_PARTIAL_LINE;
862
863 return TRACE_TYPE_HANDLED;
864}
865
866/* TRACE_FN */
867static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
868 struct trace_event *event)
869{
870 struct ftrace_entry *field;
871 struct trace_seq *s = &iter->seq;
872
873 trace_assign_type(field, iter->ent);
874
875 if (!seq_print_ip_sym(s, field->ip, flags))
876 goto partial;
877
878 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
879 if (!trace_seq_printf(s, " <-"))
880 goto partial;
881 if (!seq_print_ip_sym(s,
882 field->parent_ip,
883 flags))
884 goto partial;
885 }
886 if (!trace_seq_printf(s, "\n"))
887 goto partial;
888
889 return TRACE_TYPE_HANDLED;
890
891 partial:
892 return TRACE_TYPE_PARTIAL_LINE;
893}
894
895static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
896 struct trace_event *event)
897{
898 struct ftrace_entry *field;
899
900 trace_assign_type(field, iter->ent);
901
902 if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
903 field->ip,
904 field->parent_ip))
905 return TRACE_TYPE_PARTIAL_LINE;
906
907 return TRACE_TYPE_HANDLED;
908}
909
910static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
911 struct trace_event *event)
912{
913 struct ftrace_entry *field;
914 struct trace_seq *s = &iter->seq;
915
916 trace_assign_type(field, iter->ent);
917
918 SEQ_PUT_HEX_FIELD_RET(s, field->ip);
919 SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
920
921 return TRACE_TYPE_HANDLED;
922}
923
924static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
925 struct trace_event *event)
926{
927 struct ftrace_entry *field;
928 struct trace_seq *s = &iter->seq;
929
930 trace_assign_type(field, iter->ent);
931
932 SEQ_PUT_FIELD_RET(s, field->ip);
933 SEQ_PUT_FIELD_RET(s, field->parent_ip);
934
935 return TRACE_TYPE_HANDLED;
936}
937
938static struct trace_event_functions trace_fn_funcs = {
939 .trace = trace_fn_trace,
940 .raw = trace_fn_raw,
941 .hex = trace_fn_hex,
942 .binary = trace_fn_bin,
943};
944
945static struct trace_event trace_fn_event = {
946 .type = TRACE_FN,
947 .funcs = &trace_fn_funcs,
948};
949
950/* TRACE_CTX an TRACE_WAKE */
951static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
952 char *delim)
953{
954 struct ctx_switch_entry *field;
955 char comm[TASK_COMM_LEN];
956 int S, T;
957
958
959 trace_assign_type(field, iter->ent);
960
961 T = task_state_char(field->next_state);
962 S = task_state_char(field->prev_state);
963 trace_find_cmdline(field->next_pid, comm);
964 if (!trace_seq_printf(&iter->seq,
965 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
966 field->prev_pid,
967 field->prev_prio,
968 S, delim,
969 field->next_cpu,
970 field->next_pid,
971 field->next_prio,
972 T, comm))
973 return TRACE_TYPE_PARTIAL_LINE;
974
975 return TRACE_TYPE_HANDLED;
976}
977
978static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
979 struct trace_event *event)
980{
981 return trace_ctxwake_print(iter, "==>");
982}
983
984static enum print_line_t trace_wake_print(struct trace_iterator *iter,
985 int flags, struct trace_event *event)
986{
987 return trace_ctxwake_print(iter, " +");
988}
989
990static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
991{
992 struct ctx_switch_entry *field;
993 int T;
994
995 trace_assign_type(field, iter->ent);
996
997 if (!S)
998 S = task_state_char(field->prev_state);
999 T = task_state_char(field->next_state);
1000 if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
1001 field->prev_pid,
1002 field->prev_prio,
1003 S,
1004 field->next_cpu,
1005 field->next_pid,
1006 field->next_prio,
1007 T))
1008 return TRACE_TYPE_PARTIAL_LINE;
1009
1010 return TRACE_TYPE_HANDLED;
1011}
1012
1013static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
1014 struct trace_event *event)
1015{
1016 return trace_ctxwake_raw(iter, 0);
1017}
1018
1019static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
1020 struct trace_event *event)
1021{
1022 return trace_ctxwake_raw(iter, '+');
1023}
1024
1025
1026static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
1027{
1028 struct ctx_switch_entry *field;
1029 struct trace_seq *s = &iter->seq;
1030 int T;
1031
1032 trace_assign_type(field, iter->ent);
1033
1034 if (!S)
1035 S = task_state_char(field->prev_state);
1036 T = task_state_char(field->next_state);
1037
1038 SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
1039 SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
1040 SEQ_PUT_HEX_FIELD_RET(s, S);
1041 SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
1042 SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
1043 SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
1044 SEQ_PUT_HEX_FIELD_RET(s, T);
1045
1046 return TRACE_TYPE_HANDLED;
1047}
1048
1049static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1050 struct trace_event *event)
1051{
1052 return trace_ctxwake_hex(iter, 0);
1053}
1054
1055static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1056 struct trace_event *event)
1057{
1058 return trace_ctxwake_hex(iter, '+');
1059}
1060
1061static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1062 int flags, struct trace_event *event)
1063{
1064 struct ctx_switch_entry *field;
1065 struct trace_seq *s = &iter->seq;
1066
1067 trace_assign_type(field, iter->ent);
1068
1069 SEQ_PUT_FIELD_RET(s, field->prev_pid);
1070 SEQ_PUT_FIELD_RET(s, field->prev_prio);
1071 SEQ_PUT_FIELD_RET(s, field->prev_state);
1072 SEQ_PUT_FIELD_RET(s, field->next_pid);
1073 SEQ_PUT_FIELD_RET(s, field->next_prio);
1074 SEQ_PUT_FIELD_RET(s, field->next_state);
1075
1076 return TRACE_TYPE_HANDLED;
1077}
1078
1079static struct trace_event_functions trace_ctx_funcs = {
1080 .trace = trace_ctx_print,
1081 .raw = trace_ctx_raw,
1082 .hex = trace_ctx_hex,
1083 .binary = trace_ctxwake_bin,
1084};
1085
1086static struct trace_event trace_ctx_event = {
1087 .type = TRACE_CTX,
1088 .funcs = &trace_ctx_funcs,
1089};
1090
1091static struct trace_event_functions trace_wake_funcs = {
1092 .trace = trace_wake_print,
1093 .raw = trace_wake_raw,
1094 .hex = trace_wake_hex,
1095 .binary = trace_ctxwake_bin,
1096};
1097
1098static struct trace_event trace_wake_event = {
1099 .type = TRACE_WAKE,
1100 .funcs = &trace_wake_funcs,
1101};
1102
1103/* TRACE_STACK */
1104
1105static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1106 int flags, struct trace_event *event)
1107{
1108 struct stack_entry *field;
1109 struct trace_seq *s = &iter->seq;
1110 unsigned long *p;
1111 unsigned long *end;
1112
1113 trace_assign_type(field, iter->ent);
1114 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1115
1116 if (!trace_seq_puts(s, "<stack trace>\n"))
1117 goto partial;
1118
1119 for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1120 if (!trace_seq_puts(s, " => "))
1121 goto partial;
1122
1123 if (!seq_print_ip_sym(s, *p, flags))
1124 goto partial;
1125 if (!trace_seq_puts(s, "\n"))
1126 goto partial;
1127 }
1128
1129 return TRACE_TYPE_HANDLED;
1130
1131 partial:
1132 return TRACE_TYPE_PARTIAL_LINE;
1133}
1134
1135static struct trace_event_functions trace_stack_funcs = {
1136 .trace = trace_stack_print,
1137};
1138
1139static struct trace_event trace_stack_event = {
1140 .type = TRACE_STACK,
1141 .funcs = &trace_stack_funcs,
1142};
1143
1144/* TRACE_USER_STACK */
1145static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1146 int flags, struct trace_event *event)
1147{
1148 struct userstack_entry *field;
1149 struct trace_seq *s = &iter->seq;
1150
1151 trace_assign_type(field, iter->ent);
1152
1153 if (!trace_seq_puts(s, "<user stack trace>\n"))
1154 goto partial;
1155
1156 if (!seq_print_userip_objs(field, s, flags))
1157 goto partial;
1158
1159 return TRACE_TYPE_HANDLED;
1160
1161 partial:
1162 return TRACE_TYPE_PARTIAL_LINE;
1163}
1164
1165static struct trace_event_functions trace_user_stack_funcs = {
1166 .trace = trace_user_stack_print,
1167};
1168
1169static struct trace_event trace_user_stack_event = {
1170 .type = TRACE_USER_STACK,
1171 .funcs = &trace_user_stack_funcs,
1172};
1173
1174/* TRACE_BPRINT */
1175static enum print_line_t
1176trace_bprint_print(struct trace_iterator *iter, int flags,
1177 struct trace_event *event)
1178{
1179 struct trace_entry *entry = iter->ent;
1180 struct trace_seq *s = &iter->seq;
1181 struct bprint_entry *field;
1182
1183 trace_assign_type(field, entry);
1184
1185 if (!seq_print_ip_sym(s, field->ip, flags))
1186 goto partial;
1187
1188 if (!trace_seq_puts(s, ": "))
1189 goto partial;
1190
1191 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1192 goto partial;
1193
1194 return TRACE_TYPE_HANDLED;
1195
1196 partial:
1197 return TRACE_TYPE_PARTIAL_LINE;
1198}
1199
1200
1201static enum print_line_t
1202trace_bprint_raw(struct trace_iterator *iter, int flags,
1203 struct trace_event *event)
1204{
1205 struct bprint_entry *field;
1206 struct trace_seq *s = &iter->seq;
1207
1208 trace_assign_type(field, iter->ent);
1209
1210 if (!trace_seq_printf(s, ": %lx : ", field->ip))
1211 goto partial;
1212
1213 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1214 goto partial;
1215
1216 return TRACE_TYPE_HANDLED;
1217
1218 partial:
1219 return TRACE_TYPE_PARTIAL_LINE;
1220}
1221
1222static struct trace_event_functions trace_bprint_funcs = {
1223 .trace = trace_bprint_print,
1224 .raw = trace_bprint_raw,
1225};
1226
1227static struct trace_event trace_bprint_event = {
1228 .type = TRACE_BPRINT,
1229 .funcs = &trace_bprint_funcs,
1230};
1231
1232/* TRACE_PRINT */
1233static enum print_line_t trace_print_print(struct trace_iterator *iter,
1234 int flags, struct trace_event *event)
1235{
1236 struct print_entry *field;
1237 struct trace_seq *s = &iter->seq;
1238
1239 trace_assign_type(field, iter->ent);
1240
1241 if (!seq_print_ip_sym(s, field->ip, flags))
1242 goto partial;
1243
1244 if (!trace_seq_printf(s, ": %s", field->buf))
1245 goto partial;
1246
1247 return TRACE_TYPE_HANDLED;
1248
1249 partial:
1250 return TRACE_TYPE_PARTIAL_LINE;
1251}
1252
1253static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1254 struct trace_event *event)
1255{
1256 struct print_entry *field;
1257
1258 trace_assign_type(field, iter->ent);
1259
1260 if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1261 goto partial;
1262
1263 return TRACE_TYPE_HANDLED;
1264
1265 partial:
1266 return TRACE_TYPE_PARTIAL_LINE;
1267}
1268
1269static struct trace_event_functions trace_print_funcs = {
1270 .trace = trace_print_print,
1271 .raw = trace_print_raw,
1272};
1273
1274static struct trace_event trace_print_event = {
1275 .type = TRACE_PRINT,
1276 .funcs = &trace_print_funcs,
1277};
1278
1279
1280static struct trace_event *events[] __initdata = {
1281 &trace_fn_event,
1282 &trace_ctx_event,
1283 &trace_wake_event,
1284 &trace_stack_event,
1285 &trace_user_stack_event,
1286 &trace_bprint_event,
1287 &trace_print_event,
1288 NULL
1289};
1290
1291__init static int init_events(void)
1292{
1293 struct trace_event *event;
1294 int i, ret;
1295
1296 for (i = 0; events[i]; i++) {
1297 event = events[i];
1298
1299 ret = register_ftrace_event(event);
1300 if (!ret) {
1301 printk(KERN_WARNING "event %d failed to register\n",
1302 event->type);
1303 WARN_ON_ONCE(1);
1304 }
1305 }
1306
1307 return 0;
1308}
1309device_initcall(init_events);