Loading...
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 trace_seq_printf(p, fmt, min(buf_len - i, 16), &buf[i]);
226 trace_seq_putc(p, 0);
227
228 return ret;
229}
230EXPORT_SYMBOL(trace_print_hex_seq);
231
232const char *
233trace_print_array_seq(struct trace_seq *p, const void *buf, int count,
234 size_t el_size)
235{
236 const char *ret = trace_seq_buffer_ptr(p);
237 const char *prefix = "";
238 void *ptr = (void *)buf;
239 size_t buf_len = count * el_size;
240
241 trace_seq_putc(p, '{');
242
243 while (ptr < buf + buf_len) {
244 switch (el_size) {
245 case 1:
246 trace_seq_printf(p, "%s0x%x", prefix,
247 *(u8 *)ptr);
248 break;
249 case 2:
250 trace_seq_printf(p, "%s0x%x", prefix,
251 *(u16 *)ptr);
252 break;
253 case 4:
254 trace_seq_printf(p, "%s0x%x", prefix,
255 *(u32 *)ptr);
256 break;
257 case 8:
258 trace_seq_printf(p, "%s0x%llx", prefix,
259 *(u64 *)ptr);
260 break;
261 default:
262 trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
263 *(u8 *)ptr);
264 el_size = 1;
265 }
266 prefix = ",";
267 ptr += el_size;
268 }
269
270 trace_seq_putc(p, '}');
271 trace_seq_putc(p, 0);
272
273 return ret;
274}
275EXPORT_SYMBOL(trace_print_array_seq);
276
277const char *
278trace_print_hex_dump_seq(struct trace_seq *p, const char *prefix_str,
279 int prefix_type, int rowsize, int groupsize,
280 const void *buf, size_t len, bool ascii)
281{
282 const char *ret = trace_seq_buffer_ptr(p);
283
284 trace_seq_putc(p, '\n');
285 trace_seq_hex_dump(p, prefix_str, prefix_type,
286 rowsize, groupsize, buf, len, ascii);
287 trace_seq_putc(p, 0);
288 return ret;
289}
290EXPORT_SYMBOL(trace_print_hex_dump_seq);
291
292int trace_raw_output_prep(struct trace_iterator *iter,
293 struct trace_event *trace_event)
294{
295 struct trace_event_call *event;
296 struct trace_seq *s = &iter->seq;
297 struct trace_seq *p = &iter->tmp_seq;
298 struct trace_entry *entry;
299
300 event = container_of(trace_event, struct trace_event_call, event);
301 entry = iter->ent;
302
303 if (entry->type != event->event.type) {
304 WARN_ON_ONCE(1);
305 return TRACE_TYPE_UNHANDLED;
306 }
307
308 trace_seq_init(p);
309 trace_seq_printf(s, "%s: ", trace_event_name(event));
310
311 return trace_handle_return(s);
312}
313EXPORT_SYMBOL(trace_raw_output_prep);
314
315void trace_event_printf(struct trace_iterator *iter, const char *fmt, ...)
316{
317 va_list ap;
318
319 va_start(ap, fmt);
320 trace_check_vprintf(iter, trace_event_format(iter, fmt), ap);
321 va_end(ap);
322}
323EXPORT_SYMBOL(trace_event_printf);
324
325static __printf(3, 0)
326int trace_output_raw(struct trace_iterator *iter, char *name,
327 char *fmt, va_list ap)
328{
329 struct trace_seq *s = &iter->seq;
330
331 trace_seq_printf(s, "%s: ", name);
332 trace_seq_vprintf(s, trace_event_format(iter, fmt), ap);
333
334 return trace_handle_return(s);
335}
336
337int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
338{
339 va_list ap;
340 int ret;
341
342 va_start(ap, fmt);
343 ret = trace_output_raw(iter, name, fmt, ap);
344 va_end(ap);
345
346 return ret;
347}
348EXPORT_SYMBOL_GPL(trace_output_call);
349
350static inline const char *kretprobed(const char *name, unsigned long addr)
351{
352 if (is_kretprobe_trampoline(addr))
353 return "[unknown/kretprobe'd]";
354 return name;
355}
356
357void
358trace_seq_print_sym(struct trace_seq *s, unsigned long address, bool offset)
359{
360#ifdef CONFIG_KALLSYMS
361 char str[KSYM_SYMBOL_LEN];
362 const char *name;
363
364 if (offset)
365 sprint_symbol(str, address);
366 else
367 kallsyms_lookup(address, NULL, NULL, NULL, str);
368 name = kretprobed(str, address);
369
370 if (name && strlen(name)) {
371 trace_seq_puts(s, name);
372 return;
373 }
374#endif
375 trace_seq_printf(s, "0x%08lx", address);
376}
377
378#ifndef CONFIG_64BIT
379# define IP_FMT "%08lx"
380#else
381# define IP_FMT "%016lx"
382#endif
383
384static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
385 unsigned long ip, unsigned long sym_flags)
386{
387 struct file *file = NULL;
388 unsigned long vmstart = 0;
389 int ret = 1;
390
391 if (s->full)
392 return 0;
393
394 if (mm) {
395 const struct vm_area_struct *vma;
396
397 mmap_read_lock(mm);
398 vma = find_vma(mm, ip);
399 if (vma) {
400 file = vma->vm_file;
401 vmstart = vma->vm_start;
402 }
403 if (file) {
404 ret = trace_seq_path(s, &file->f_path);
405 if (ret)
406 trace_seq_printf(s, "[+0x%lx]",
407 ip - vmstart);
408 }
409 mmap_read_unlock(mm);
410 }
411 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
412 trace_seq_printf(s, " <" IP_FMT ">", ip);
413 return !trace_seq_has_overflowed(s);
414}
415
416int
417seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
418{
419 if (!ip) {
420 trace_seq_putc(s, '0');
421 goto out;
422 }
423
424 trace_seq_print_sym(s, ip, sym_flags & TRACE_ITER_SYM_OFFSET);
425
426 if (sym_flags & TRACE_ITER_SYM_ADDR)
427 trace_seq_printf(s, " <" IP_FMT ">", ip);
428
429 out:
430 return !trace_seq_has_overflowed(s);
431}
432
433/**
434 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
435 * @s: trace seq struct to write to
436 * @entry: The trace entry field from the ring buffer
437 *
438 * Prints the generic fields of irqs off, in hard or softirq, preempt
439 * count.
440 */
441int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
442{
443 char hardsoft_irq;
444 char need_resched;
445 char irqs_off;
446 int hardirq;
447 int softirq;
448 int bh_off;
449 int nmi;
450
451 nmi = entry->flags & TRACE_FLAG_NMI;
452 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
453 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
454 bh_off = entry->flags & TRACE_FLAG_BH_OFF;
455
456 irqs_off =
457 (entry->flags & TRACE_FLAG_IRQS_OFF && bh_off) ? 'D' :
458 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
459 bh_off ? 'b' :
460 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
461 '.';
462
463 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
464 TRACE_FLAG_PREEMPT_RESCHED)) {
465 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
466 need_resched = 'N';
467 break;
468 case TRACE_FLAG_NEED_RESCHED:
469 need_resched = 'n';
470 break;
471 case TRACE_FLAG_PREEMPT_RESCHED:
472 need_resched = 'p';
473 break;
474 default:
475 need_resched = '.';
476 break;
477 }
478
479 hardsoft_irq =
480 (nmi && hardirq) ? 'Z' :
481 nmi ? 'z' :
482 (hardirq && softirq) ? 'H' :
483 hardirq ? 'h' :
484 softirq ? 's' :
485 '.' ;
486
487 trace_seq_printf(s, "%c%c%c",
488 irqs_off, need_resched, hardsoft_irq);
489
490 if (entry->preempt_count & 0xf)
491 trace_seq_printf(s, "%x", entry->preempt_count & 0xf);
492 else
493 trace_seq_putc(s, '.');
494
495 if (entry->preempt_count & 0xf0)
496 trace_seq_printf(s, "%x", entry->preempt_count >> 4);
497 else
498 trace_seq_putc(s, '.');
499
500 return !trace_seq_has_overflowed(s);
501}
502
503static int
504lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
505{
506 char comm[TASK_COMM_LEN];
507
508 trace_find_cmdline(entry->pid, comm);
509
510 trace_seq_printf(s, "%8.8s-%-7d %3d",
511 comm, entry->pid, cpu);
512
513 return trace_print_lat_fmt(s, entry);
514}
515
516#undef MARK
517#define MARK(v, s) {.val = v, .sym = s}
518/* trace overhead mark */
519static const struct trace_mark {
520 unsigned long long val; /* unit: nsec */
521 char sym;
522} mark[] = {
523 MARK(1000000000ULL , '$'), /* 1 sec */
524 MARK(100000000ULL , '@'), /* 100 msec */
525 MARK(10000000ULL , '*'), /* 10 msec */
526 MARK(1000000ULL , '#'), /* 1000 usecs */
527 MARK(100000ULL , '!'), /* 100 usecs */
528 MARK(10000ULL , '+'), /* 10 usecs */
529};
530#undef MARK
531
532char trace_find_mark(unsigned long long d)
533{
534 int i;
535 int size = ARRAY_SIZE(mark);
536
537 for (i = 0; i < size; i++) {
538 if (d > mark[i].val)
539 break;
540 }
541
542 return (i == size) ? ' ' : mark[i].sym;
543}
544
545static int
546lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
547{
548 struct trace_array *tr = iter->tr;
549 unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
550 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
551 unsigned long long abs_ts = iter->ts - iter->array_buffer->time_start;
552 unsigned long long rel_ts = next_ts - iter->ts;
553 struct trace_seq *s = &iter->seq;
554
555 if (in_ns) {
556 abs_ts = ns2usecs(abs_ts);
557 rel_ts = ns2usecs(rel_ts);
558 }
559
560 if (verbose && in_ns) {
561 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
562 unsigned long abs_msec = (unsigned long)abs_ts;
563 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
564 unsigned long rel_msec = (unsigned long)rel_ts;
565
566 trace_seq_printf(
567 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
568 ns2usecs(iter->ts),
569 abs_msec, abs_usec,
570 rel_msec, rel_usec);
571
572 } else if (verbose && !in_ns) {
573 trace_seq_printf(
574 s, "[%016llx] %lld (+%lld): ",
575 iter->ts, abs_ts, rel_ts);
576
577 } else if (!verbose && in_ns) {
578 trace_seq_printf(
579 s, " %4lldus%c: ",
580 abs_ts,
581 trace_find_mark(rel_ts * NSEC_PER_USEC));
582
583 } else { /* !verbose && !in_ns */
584 trace_seq_printf(s, " %4lld: ", abs_ts);
585 }
586
587 return !trace_seq_has_overflowed(s);
588}
589
590static void trace_print_time(struct trace_seq *s, struct trace_iterator *iter,
591 unsigned long long ts)
592{
593 unsigned long secs, usec_rem;
594 unsigned long long t;
595
596 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
597 t = ns2usecs(ts);
598 usec_rem = do_div(t, USEC_PER_SEC);
599 secs = (unsigned long)t;
600 trace_seq_printf(s, " %5lu.%06lu", secs, usec_rem);
601 } else
602 trace_seq_printf(s, " %12llu", ts);
603}
604
605int trace_print_context(struct trace_iterator *iter)
606{
607 struct trace_array *tr = iter->tr;
608 struct trace_seq *s = &iter->seq;
609 struct trace_entry *entry = iter->ent;
610 char comm[TASK_COMM_LEN];
611
612 trace_find_cmdline(entry->pid, comm);
613
614 trace_seq_printf(s, "%16s-%-7d ", comm, entry->pid);
615
616 if (tr->trace_flags & TRACE_ITER_RECORD_TGID) {
617 unsigned int tgid = trace_find_tgid(entry->pid);
618
619 if (!tgid)
620 trace_seq_printf(s, "(-------) ");
621 else
622 trace_seq_printf(s, "(%7d) ", tgid);
623 }
624
625 trace_seq_printf(s, "[%03d] ", iter->cpu);
626
627 if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
628 trace_print_lat_fmt(s, entry);
629
630 trace_print_time(s, iter, iter->ts);
631 trace_seq_puts(s, ": ");
632
633 return !trace_seq_has_overflowed(s);
634}
635
636int trace_print_lat_context(struct trace_iterator *iter)
637{
638 struct trace_entry *entry, *next_entry;
639 struct trace_array *tr = iter->tr;
640 struct trace_seq *s = &iter->seq;
641 unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
642 u64 next_ts;
643
644 next_entry = trace_find_next_entry(iter, NULL, &next_ts);
645 if (!next_entry)
646 next_ts = iter->ts;
647
648 /* trace_find_next_entry() may change iter->ent */
649 entry = iter->ent;
650
651 if (verbose) {
652 char comm[TASK_COMM_LEN];
653
654 trace_find_cmdline(entry->pid, comm);
655
656 trace_seq_printf(
657 s, "%16s %7d %3d %d %08x %08lx ",
658 comm, entry->pid, iter->cpu, entry->flags,
659 entry->preempt_count & 0xf, iter->idx);
660 } else {
661 lat_print_generic(s, entry, iter->cpu);
662 }
663
664 lat_print_timestamp(iter, next_ts);
665
666 return !trace_seq_has_overflowed(s);
667}
668
669/**
670 * ftrace_find_event - find a registered event
671 * @type: the type of event to look for
672 *
673 * Returns an event of type @type otherwise NULL
674 * Called with trace_event_read_lock() held.
675 */
676struct trace_event *ftrace_find_event(int type)
677{
678 struct trace_event *event;
679 unsigned key;
680
681 key = type & (EVENT_HASHSIZE - 1);
682
683 hlist_for_each_entry(event, &event_hash[key], node) {
684 if (event->type == type)
685 return event;
686 }
687
688 return NULL;
689}
690
691static DEFINE_IDA(trace_event_ida);
692
693static void free_trace_event_type(int type)
694{
695 if (type >= __TRACE_LAST_TYPE)
696 ida_free(&trace_event_ida, type);
697}
698
699static int alloc_trace_event_type(void)
700{
701 int next;
702
703 /* Skip static defined type numbers */
704 next = ida_alloc_range(&trace_event_ida, __TRACE_LAST_TYPE,
705 TRACE_EVENT_TYPE_MAX, GFP_KERNEL);
706 if (next < 0)
707 return 0;
708 return next;
709}
710
711void trace_event_read_lock(void)
712{
713 down_read(&trace_event_sem);
714}
715
716void 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 */
736int 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 if (!event->type) {
750 event->type = alloc_trace_event_type();
751 if (!event->type)
752 goto out;
753 } else if (WARN(event->type > __TRACE_LAST_TYPE,
754 "Need to add type to trace.h")) {
755 goto out;
756 } else {
757 /* Is this event already used */
758 if (ftrace_find_event(event->type))
759 goto out;
760 }
761
762 if (event->funcs->trace == NULL)
763 event->funcs->trace = trace_nop_print;
764 if (event->funcs->raw == NULL)
765 event->funcs->raw = trace_nop_print;
766 if (event->funcs->hex == NULL)
767 event->funcs->hex = trace_nop_print;
768 if (event->funcs->binary == NULL)
769 event->funcs->binary = trace_nop_print;
770
771 key = event->type & (EVENT_HASHSIZE - 1);
772
773 hlist_add_head(&event->node, &event_hash[key]);
774
775 ret = event->type;
776 out:
777 up_write(&trace_event_sem);
778
779 return ret;
780}
781EXPORT_SYMBOL_GPL(register_trace_event);
782
783/*
784 * Used by module code with the trace_event_sem held for write.
785 */
786int __unregister_trace_event(struct trace_event *event)
787{
788 hlist_del(&event->node);
789 free_trace_event_type(event->type);
790 return 0;
791}
792
793/**
794 * unregister_trace_event - remove a no longer used event
795 * @event: the event to remove
796 */
797int unregister_trace_event(struct trace_event *event)
798{
799 down_write(&trace_event_sem);
800 __unregister_trace_event(event);
801 up_write(&trace_event_sem);
802
803 return 0;
804}
805EXPORT_SYMBOL_GPL(unregister_trace_event);
806
807/*
808 * Standard events
809 */
810
811enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
812 struct trace_event *event)
813{
814 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
815
816 return trace_handle_return(&iter->seq);
817}
818
819static void print_fn_trace(struct trace_seq *s, unsigned long ip,
820 unsigned long parent_ip, int flags)
821{
822 seq_print_ip_sym(s, ip, flags);
823
824 if ((flags & TRACE_ITER_PRINT_PARENT) && parent_ip) {
825 trace_seq_puts(s, " <-");
826 seq_print_ip_sym(s, parent_ip, flags);
827 }
828}
829
830/* TRACE_FN */
831static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
832 struct trace_event *event)
833{
834 struct ftrace_entry *field;
835 struct trace_seq *s = &iter->seq;
836
837 trace_assign_type(field, iter->ent);
838
839 print_fn_trace(s, field->ip, field->parent_ip, flags);
840 trace_seq_putc(s, '\n');
841
842 return trace_handle_return(s);
843}
844
845static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
846 struct trace_event *event)
847{
848 struct ftrace_entry *field;
849
850 trace_assign_type(field, iter->ent);
851
852 trace_seq_printf(&iter->seq, "%lx %lx\n",
853 field->ip,
854 field->parent_ip);
855
856 return trace_handle_return(&iter->seq);
857}
858
859static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
860 struct trace_event *event)
861{
862 struct ftrace_entry *field;
863 struct trace_seq *s = &iter->seq;
864
865 trace_assign_type(field, iter->ent);
866
867 SEQ_PUT_HEX_FIELD(s, field->ip);
868 SEQ_PUT_HEX_FIELD(s, field->parent_ip);
869
870 return trace_handle_return(s);
871}
872
873static enum print_line_t trace_fn_bin(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_FIELD(s, field->ip);
882 SEQ_PUT_FIELD(s, field->parent_ip);
883
884 return trace_handle_return(s);
885}
886
887static struct trace_event_functions trace_fn_funcs = {
888 .trace = trace_fn_trace,
889 .raw = trace_fn_raw,
890 .hex = trace_fn_hex,
891 .binary = trace_fn_bin,
892};
893
894static struct trace_event trace_fn_event = {
895 .type = TRACE_FN,
896 .funcs = &trace_fn_funcs,
897};
898
899/* TRACE_CTX an TRACE_WAKE */
900static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
901 char *delim)
902{
903 struct ctx_switch_entry *field;
904 char comm[TASK_COMM_LEN];
905 int S, T;
906
907
908 trace_assign_type(field, iter->ent);
909
910 T = task_index_to_char(field->next_state);
911 S = task_index_to_char(field->prev_state);
912 trace_find_cmdline(field->next_pid, comm);
913 trace_seq_printf(&iter->seq,
914 " %7d:%3d:%c %s [%03d] %7d:%3d:%c %s\n",
915 field->prev_pid,
916 field->prev_prio,
917 S, delim,
918 field->next_cpu,
919 field->next_pid,
920 field->next_prio,
921 T, comm);
922
923 return trace_handle_return(&iter->seq);
924}
925
926static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
927 struct trace_event *event)
928{
929 return trace_ctxwake_print(iter, "==>");
930}
931
932static enum print_line_t trace_wake_print(struct trace_iterator *iter,
933 int flags, struct trace_event *event)
934{
935 return trace_ctxwake_print(iter, " +");
936}
937
938static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
939{
940 struct ctx_switch_entry *field;
941 int T;
942
943 trace_assign_type(field, iter->ent);
944
945 if (!S)
946 S = task_index_to_char(field->prev_state);
947 T = task_index_to_char(field->next_state);
948 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
949 field->prev_pid,
950 field->prev_prio,
951 S,
952 field->next_cpu,
953 field->next_pid,
954 field->next_prio,
955 T);
956
957 return trace_handle_return(&iter->seq);
958}
959
960static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
961 struct trace_event *event)
962{
963 return trace_ctxwake_raw(iter, 0);
964}
965
966static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
967 struct trace_event *event)
968{
969 return trace_ctxwake_raw(iter, '+');
970}
971
972
973static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
974{
975 struct ctx_switch_entry *field;
976 struct trace_seq *s = &iter->seq;
977 int T;
978
979 trace_assign_type(field, iter->ent);
980
981 if (!S)
982 S = task_index_to_char(field->prev_state);
983 T = task_index_to_char(field->next_state);
984
985 SEQ_PUT_HEX_FIELD(s, field->prev_pid);
986 SEQ_PUT_HEX_FIELD(s, field->prev_prio);
987 SEQ_PUT_HEX_FIELD(s, S);
988 SEQ_PUT_HEX_FIELD(s, field->next_cpu);
989 SEQ_PUT_HEX_FIELD(s, field->next_pid);
990 SEQ_PUT_HEX_FIELD(s, field->next_prio);
991 SEQ_PUT_HEX_FIELD(s, T);
992
993 return trace_handle_return(s);
994}
995
996static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
997 struct trace_event *event)
998{
999 return trace_ctxwake_hex(iter, 0);
1000}
1001
1002static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1003 struct trace_event *event)
1004{
1005 return trace_ctxwake_hex(iter, '+');
1006}
1007
1008static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1009 int flags, struct trace_event *event)
1010{
1011 struct ctx_switch_entry *field;
1012 struct trace_seq *s = &iter->seq;
1013
1014 trace_assign_type(field, iter->ent);
1015
1016 SEQ_PUT_FIELD(s, field->prev_pid);
1017 SEQ_PUT_FIELD(s, field->prev_prio);
1018 SEQ_PUT_FIELD(s, field->prev_state);
1019 SEQ_PUT_FIELD(s, field->next_cpu);
1020 SEQ_PUT_FIELD(s, field->next_pid);
1021 SEQ_PUT_FIELD(s, field->next_prio);
1022 SEQ_PUT_FIELD(s, field->next_state);
1023
1024 return trace_handle_return(s);
1025}
1026
1027static struct trace_event_functions trace_ctx_funcs = {
1028 .trace = trace_ctx_print,
1029 .raw = trace_ctx_raw,
1030 .hex = trace_ctx_hex,
1031 .binary = trace_ctxwake_bin,
1032};
1033
1034static struct trace_event trace_ctx_event = {
1035 .type = TRACE_CTX,
1036 .funcs = &trace_ctx_funcs,
1037};
1038
1039static struct trace_event_functions trace_wake_funcs = {
1040 .trace = trace_wake_print,
1041 .raw = trace_wake_raw,
1042 .hex = trace_wake_hex,
1043 .binary = trace_ctxwake_bin,
1044};
1045
1046static struct trace_event trace_wake_event = {
1047 .type = TRACE_WAKE,
1048 .funcs = &trace_wake_funcs,
1049};
1050
1051/* TRACE_STACK */
1052
1053static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1054 int flags, struct trace_event *event)
1055{
1056 struct stack_entry *field;
1057 struct trace_seq *s = &iter->seq;
1058 unsigned long *p;
1059 unsigned long *end;
1060
1061 trace_assign_type(field, iter->ent);
1062 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1063
1064 trace_seq_puts(s, "<stack trace>\n");
1065
1066 for (p = field->caller; p && p < end && *p != ULONG_MAX; p++) {
1067
1068 if (trace_seq_has_overflowed(s))
1069 break;
1070
1071 trace_seq_puts(s, " => ");
1072 seq_print_ip_sym(s, *p, flags);
1073 trace_seq_putc(s, '\n');
1074 }
1075
1076 return trace_handle_return(s);
1077}
1078
1079static struct trace_event_functions trace_stack_funcs = {
1080 .trace = trace_stack_print,
1081};
1082
1083static struct trace_event trace_stack_event = {
1084 .type = TRACE_STACK,
1085 .funcs = &trace_stack_funcs,
1086};
1087
1088/* TRACE_USER_STACK */
1089static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1090 int flags, struct trace_event *event)
1091{
1092 struct trace_array *tr = iter->tr;
1093 struct userstack_entry *field;
1094 struct trace_seq *s = &iter->seq;
1095 struct mm_struct *mm = NULL;
1096 unsigned int i;
1097
1098 trace_assign_type(field, iter->ent);
1099
1100 trace_seq_puts(s, "<user stack trace>\n");
1101
1102 if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
1103 struct task_struct *task;
1104 /*
1105 * we do the lookup on the thread group leader,
1106 * since individual threads might have already quit!
1107 */
1108 rcu_read_lock();
1109 task = find_task_by_vpid(field->tgid);
1110 if (task)
1111 mm = get_task_mm(task);
1112 rcu_read_unlock();
1113 }
1114
1115 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1116 unsigned long ip = field->caller[i];
1117
1118 if (!ip || trace_seq_has_overflowed(s))
1119 break;
1120
1121 trace_seq_puts(s, " => ");
1122 seq_print_user_ip(s, mm, ip, flags);
1123 trace_seq_putc(s, '\n');
1124 }
1125
1126 if (mm)
1127 mmput(mm);
1128
1129 return trace_handle_return(s);
1130}
1131
1132static struct trace_event_functions trace_user_stack_funcs = {
1133 .trace = trace_user_stack_print,
1134};
1135
1136static struct trace_event trace_user_stack_event = {
1137 .type = TRACE_USER_STACK,
1138 .funcs = &trace_user_stack_funcs,
1139};
1140
1141/* TRACE_HWLAT */
1142static enum print_line_t
1143trace_hwlat_print(struct trace_iterator *iter, int flags,
1144 struct trace_event *event)
1145{
1146 struct trace_entry *entry = iter->ent;
1147 struct trace_seq *s = &iter->seq;
1148 struct hwlat_entry *field;
1149
1150 trace_assign_type(field, entry);
1151
1152 trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld count:%d",
1153 field->seqnum,
1154 field->duration,
1155 field->outer_duration,
1156 (long long)field->timestamp.tv_sec,
1157 field->timestamp.tv_nsec, field->count);
1158
1159 if (field->nmi_count) {
1160 /*
1161 * The generic sched_clock() is not NMI safe, thus
1162 * we only record the count and not the time.
1163 */
1164 if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK))
1165 trace_seq_printf(s, " nmi-total:%llu",
1166 field->nmi_total_ts);
1167 trace_seq_printf(s, " nmi-count:%u",
1168 field->nmi_count);
1169 }
1170
1171 trace_seq_putc(s, '\n');
1172
1173 return trace_handle_return(s);
1174}
1175
1176static enum print_line_t
1177trace_hwlat_raw(struct trace_iterator *iter, int flags,
1178 struct trace_event *event)
1179{
1180 struct hwlat_entry *field;
1181 struct trace_seq *s = &iter->seq;
1182
1183 trace_assign_type(field, iter->ent);
1184
1185 trace_seq_printf(s, "%llu %lld %lld %09ld %u\n",
1186 field->duration,
1187 field->outer_duration,
1188 (long long)field->timestamp.tv_sec,
1189 field->timestamp.tv_nsec,
1190 field->seqnum);
1191
1192 return trace_handle_return(s);
1193}
1194
1195static struct trace_event_functions trace_hwlat_funcs = {
1196 .trace = trace_hwlat_print,
1197 .raw = trace_hwlat_raw,
1198};
1199
1200static struct trace_event trace_hwlat_event = {
1201 .type = TRACE_HWLAT,
1202 .funcs = &trace_hwlat_funcs,
1203};
1204
1205/* TRACE_OSNOISE */
1206static enum print_line_t
1207trace_osnoise_print(struct trace_iterator *iter, int flags,
1208 struct trace_event *event)
1209{
1210 struct trace_entry *entry = iter->ent;
1211 struct trace_seq *s = &iter->seq;
1212 struct osnoise_entry *field;
1213 u64 ratio, ratio_dec;
1214 u64 net_runtime;
1215
1216 trace_assign_type(field, entry);
1217
1218 /*
1219 * compute the available % of cpu time.
1220 */
1221 net_runtime = field->runtime - field->noise;
1222 ratio = net_runtime * 10000000;
1223 do_div(ratio, field->runtime);
1224 ratio_dec = do_div(ratio, 100000);
1225
1226 trace_seq_printf(s, "%llu %10llu %3llu.%05llu %7llu",
1227 field->runtime,
1228 field->noise,
1229 ratio, ratio_dec,
1230 field->max_sample);
1231
1232 trace_seq_printf(s, " %6u", field->hw_count);
1233 trace_seq_printf(s, " %6u", field->nmi_count);
1234 trace_seq_printf(s, " %6u", field->irq_count);
1235 trace_seq_printf(s, " %6u", field->softirq_count);
1236 trace_seq_printf(s, " %6u", field->thread_count);
1237
1238 trace_seq_putc(s, '\n');
1239
1240 return trace_handle_return(s);
1241}
1242
1243static enum print_line_t
1244trace_osnoise_raw(struct trace_iterator *iter, int flags,
1245 struct trace_event *event)
1246{
1247 struct osnoise_entry *field;
1248 struct trace_seq *s = &iter->seq;
1249
1250 trace_assign_type(field, iter->ent);
1251
1252 trace_seq_printf(s, "%lld %llu %llu %u %u %u %u %u\n",
1253 field->runtime,
1254 field->noise,
1255 field->max_sample,
1256 field->hw_count,
1257 field->nmi_count,
1258 field->irq_count,
1259 field->softirq_count,
1260 field->thread_count);
1261
1262 return trace_handle_return(s);
1263}
1264
1265static struct trace_event_functions trace_osnoise_funcs = {
1266 .trace = trace_osnoise_print,
1267 .raw = trace_osnoise_raw,
1268};
1269
1270static struct trace_event trace_osnoise_event = {
1271 .type = TRACE_OSNOISE,
1272 .funcs = &trace_osnoise_funcs,
1273};
1274
1275/* TRACE_TIMERLAT */
1276static enum print_line_t
1277trace_timerlat_print(struct trace_iterator *iter, int flags,
1278 struct trace_event *event)
1279{
1280 struct trace_entry *entry = iter->ent;
1281 struct trace_seq *s = &iter->seq;
1282 struct timerlat_entry *field;
1283
1284 trace_assign_type(field, entry);
1285
1286 trace_seq_printf(s, "#%-5u context %6s timer_latency %9llu ns\n",
1287 field->seqnum,
1288 field->context ? "thread" : "irq",
1289 field->timer_latency);
1290
1291 return trace_handle_return(s);
1292}
1293
1294static enum print_line_t
1295trace_timerlat_raw(struct trace_iterator *iter, int flags,
1296 struct trace_event *event)
1297{
1298 struct timerlat_entry *field;
1299 struct trace_seq *s = &iter->seq;
1300
1301 trace_assign_type(field, iter->ent);
1302
1303 trace_seq_printf(s, "%u %d %llu\n",
1304 field->seqnum,
1305 field->context,
1306 field->timer_latency);
1307
1308 return trace_handle_return(s);
1309}
1310
1311static struct trace_event_functions trace_timerlat_funcs = {
1312 .trace = trace_timerlat_print,
1313 .raw = trace_timerlat_raw,
1314};
1315
1316static struct trace_event trace_timerlat_event = {
1317 .type = TRACE_TIMERLAT,
1318 .funcs = &trace_timerlat_funcs,
1319};
1320
1321/* TRACE_BPUTS */
1322static enum print_line_t
1323trace_bputs_print(struct trace_iterator *iter, int flags,
1324 struct trace_event *event)
1325{
1326 struct trace_entry *entry = iter->ent;
1327 struct trace_seq *s = &iter->seq;
1328 struct bputs_entry *field;
1329
1330 trace_assign_type(field, entry);
1331
1332 seq_print_ip_sym(s, field->ip, flags);
1333 trace_seq_puts(s, ": ");
1334 trace_seq_puts(s, field->str);
1335
1336 return trace_handle_return(s);
1337}
1338
1339
1340static enum print_line_t
1341trace_bputs_raw(struct trace_iterator *iter, int flags,
1342 struct trace_event *event)
1343{
1344 struct bputs_entry *field;
1345 struct trace_seq *s = &iter->seq;
1346
1347 trace_assign_type(field, iter->ent);
1348
1349 trace_seq_printf(s, ": %lx : ", field->ip);
1350 trace_seq_puts(s, field->str);
1351
1352 return trace_handle_return(s);
1353}
1354
1355static struct trace_event_functions trace_bputs_funcs = {
1356 .trace = trace_bputs_print,
1357 .raw = trace_bputs_raw,
1358};
1359
1360static struct trace_event trace_bputs_event = {
1361 .type = TRACE_BPUTS,
1362 .funcs = &trace_bputs_funcs,
1363};
1364
1365/* TRACE_BPRINT */
1366static enum print_line_t
1367trace_bprint_print(struct trace_iterator *iter, int flags,
1368 struct trace_event *event)
1369{
1370 struct trace_entry *entry = iter->ent;
1371 struct trace_seq *s = &iter->seq;
1372 struct bprint_entry *field;
1373
1374 trace_assign_type(field, entry);
1375
1376 seq_print_ip_sym(s, field->ip, flags);
1377 trace_seq_puts(s, ": ");
1378 trace_seq_bprintf(s, field->fmt, field->buf);
1379
1380 return trace_handle_return(s);
1381}
1382
1383
1384static enum print_line_t
1385trace_bprint_raw(struct trace_iterator *iter, int flags,
1386 struct trace_event *event)
1387{
1388 struct bprint_entry *field;
1389 struct trace_seq *s = &iter->seq;
1390
1391 trace_assign_type(field, iter->ent);
1392
1393 trace_seq_printf(s, ": %lx : ", field->ip);
1394 trace_seq_bprintf(s, field->fmt, field->buf);
1395
1396 return trace_handle_return(s);
1397}
1398
1399static struct trace_event_functions trace_bprint_funcs = {
1400 .trace = trace_bprint_print,
1401 .raw = trace_bprint_raw,
1402};
1403
1404static struct trace_event trace_bprint_event = {
1405 .type = TRACE_BPRINT,
1406 .funcs = &trace_bprint_funcs,
1407};
1408
1409/* TRACE_PRINT */
1410static enum print_line_t trace_print_print(struct trace_iterator *iter,
1411 int flags, struct trace_event *event)
1412{
1413 struct print_entry *field;
1414 struct trace_seq *s = &iter->seq;
1415
1416 trace_assign_type(field, iter->ent);
1417
1418 seq_print_ip_sym(s, field->ip, flags);
1419 trace_seq_printf(s, ": %s", field->buf);
1420
1421 return trace_handle_return(s);
1422}
1423
1424static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1425 struct trace_event *event)
1426{
1427 struct print_entry *field;
1428
1429 trace_assign_type(field, iter->ent);
1430
1431 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1432
1433 return trace_handle_return(&iter->seq);
1434}
1435
1436static struct trace_event_functions trace_print_funcs = {
1437 .trace = trace_print_print,
1438 .raw = trace_print_raw,
1439};
1440
1441static struct trace_event trace_print_event = {
1442 .type = TRACE_PRINT,
1443 .funcs = &trace_print_funcs,
1444};
1445
1446static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags,
1447 struct trace_event *event)
1448{
1449 struct raw_data_entry *field;
1450 int i;
1451
1452 trace_assign_type(field, iter->ent);
1453
1454 trace_seq_printf(&iter->seq, "# %x buf:", field->id);
1455
1456 for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++)
1457 trace_seq_printf(&iter->seq, " %02x",
1458 (unsigned char)field->buf[i]);
1459
1460 trace_seq_putc(&iter->seq, '\n');
1461
1462 return trace_handle_return(&iter->seq);
1463}
1464
1465static struct trace_event_functions trace_raw_data_funcs = {
1466 .trace = trace_raw_data,
1467 .raw = trace_raw_data,
1468};
1469
1470static struct trace_event trace_raw_data_event = {
1471 .type = TRACE_RAW_DATA,
1472 .funcs = &trace_raw_data_funcs,
1473};
1474
1475static enum print_line_t
1476trace_func_repeats_raw(struct trace_iterator *iter, int flags,
1477 struct trace_event *event)
1478{
1479 struct func_repeats_entry *field;
1480 struct trace_seq *s = &iter->seq;
1481
1482 trace_assign_type(field, iter->ent);
1483
1484 trace_seq_printf(s, "%lu %lu %u %llu\n",
1485 field->ip,
1486 field->parent_ip,
1487 field->count,
1488 FUNC_REPEATS_GET_DELTA_TS(field));
1489
1490 return trace_handle_return(s);
1491}
1492
1493static enum print_line_t
1494trace_func_repeats_print(struct trace_iterator *iter, int flags,
1495 struct trace_event *event)
1496{
1497 struct func_repeats_entry *field;
1498 struct trace_seq *s = &iter->seq;
1499
1500 trace_assign_type(field, iter->ent);
1501
1502 print_fn_trace(s, field->ip, field->parent_ip, flags);
1503 trace_seq_printf(s, " (repeats: %u, last_ts:", field->count);
1504 trace_print_time(s, iter,
1505 iter->ts - FUNC_REPEATS_GET_DELTA_TS(field));
1506 trace_seq_puts(s, ")\n");
1507
1508 return trace_handle_return(s);
1509}
1510
1511static struct trace_event_functions trace_func_repeats_funcs = {
1512 .trace = trace_func_repeats_print,
1513 .raw = trace_func_repeats_raw,
1514};
1515
1516static struct trace_event trace_func_repeats_event = {
1517 .type = TRACE_FUNC_REPEATS,
1518 .funcs = &trace_func_repeats_funcs,
1519};
1520
1521static struct trace_event *events[] __initdata = {
1522 &trace_fn_event,
1523 &trace_ctx_event,
1524 &trace_wake_event,
1525 &trace_stack_event,
1526 &trace_user_stack_event,
1527 &trace_bputs_event,
1528 &trace_bprint_event,
1529 &trace_print_event,
1530 &trace_hwlat_event,
1531 &trace_osnoise_event,
1532 &trace_timerlat_event,
1533 &trace_raw_data_event,
1534 &trace_func_repeats_event,
1535 NULL
1536};
1537
1538__init int init_events(void)
1539{
1540 struct trace_event *event;
1541 int i, ret;
1542
1543 for (i = 0; events[i]; i++) {
1544 event = events[i];
1545 ret = register_trace_event(event);
1546 WARN_ONCE(!ret, "event %d failed to register", event->type);
1547 }
1548
1549 return 0;
1550}
1/*
2 * trace_output.c
3 *
4 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
5 *
6 */
7
8#include <linux/module.h>
9#include <linux/mutex.h>
10#include <linux/ftrace.h>
11
12#include "trace_output.h"
13
14/* must be a power of 2 */
15#define EVENT_HASHSIZE 128
16
17DECLARE_RWSEM(trace_event_sem);
18
19static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
20
21static int next_event_type = __TRACE_LAST_TYPE + 1;
22
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_bputs_msg_only(struct trace_iterator *iter)
41{
42 struct trace_seq *s = &iter->seq;
43 struct trace_entry *entry = iter->ent;
44 struct bputs_entry *field;
45 int ret;
46
47 trace_assign_type(field, entry);
48
49 ret = trace_seq_puts(s, field->str);
50 if (!ret)
51 return TRACE_TYPE_PARTIAL_LINE;
52
53 return TRACE_TYPE_HANDLED;
54}
55
56enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
57{
58 struct trace_seq *s = &iter->seq;
59 struct trace_entry *entry = iter->ent;
60 struct bprint_entry *field;
61 int ret;
62
63 trace_assign_type(field, entry);
64
65 ret = trace_seq_bprintf(s, field->fmt, field->buf);
66 if (!ret)
67 return TRACE_TYPE_PARTIAL_LINE;
68
69 return TRACE_TYPE_HANDLED;
70}
71
72enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
73{
74 struct trace_seq *s = &iter->seq;
75 struct trace_entry *entry = iter->ent;
76 struct print_entry *field;
77 int ret;
78
79 trace_assign_type(field, entry);
80
81 ret = trace_seq_puts(s, field->buf);
82 if (!ret)
83 return TRACE_TYPE_PARTIAL_LINE;
84
85 return TRACE_TYPE_HANDLED;
86}
87
88/**
89 * trace_seq_printf - sequence printing of trace information
90 * @s: trace sequence descriptor
91 * @fmt: printf format string
92 *
93 * It returns 0 if the trace oversizes the buffer's free
94 * space, 1 otherwise.
95 *
96 * The tracer may use either sequence operations or its own
97 * copy to user routines. To simplify formating of a trace
98 * trace_seq_printf is used to store strings into a special
99 * buffer (@s). Then the output may be either used by
100 * the sequencer or pulled into another buffer.
101 */
102int
103trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
104{
105 int len = (PAGE_SIZE - 1) - s->len;
106 va_list ap;
107 int ret;
108
109 if (s->full || !len)
110 return 0;
111
112 va_start(ap, fmt);
113 ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
114 va_end(ap);
115
116 /* If we can't write it all, don't bother writing anything */
117 if (ret >= len) {
118 s->full = 1;
119 return 0;
120 }
121
122 s->len += ret;
123
124 return 1;
125}
126EXPORT_SYMBOL_GPL(trace_seq_printf);
127
128/**
129 * trace_seq_vprintf - sequence printing of trace information
130 * @s: trace sequence descriptor
131 * @fmt: printf format string
132 *
133 * The tracer may use either sequence operations or its own
134 * copy to user routines. To simplify formating of a trace
135 * trace_seq_printf is used to store strings into a special
136 * buffer (@s). Then the output may be either used by
137 * the sequencer or pulled into another buffer.
138 */
139int
140trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
141{
142 int len = (PAGE_SIZE - 1) - s->len;
143 int ret;
144
145 if (s->full || !len)
146 return 0;
147
148 ret = vsnprintf(s->buffer + s->len, len, fmt, args);
149
150 /* If we can't write it all, don't bother writing anything */
151 if (ret >= len) {
152 s->full = 1;
153 return 0;
154 }
155
156 s->len += ret;
157
158 return len;
159}
160EXPORT_SYMBOL_GPL(trace_seq_vprintf);
161
162int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
163{
164 int len = (PAGE_SIZE - 1) - s->len;
165 int ret;
166
167 if (s->full || !len)
168 return 0;
169
170 ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
171
172 /* If we can't write it all, don't bother writing anything */
173 if (ret >= len) {
174 s->full = 1;
175 return 0;
176 }
177
178 s->len += ret;
179
180 return len;
181}
182
183/**
184 * trace_seq_puts - trace sequence printing of simple string
185 * @s: trace sequence descriptor
186 * @str: simple string to record
187 *
188 * The tracer may use either the sequence operations or its own
189 * copy to user routines. This function records a simple string
190 * into a special buffer (@s) for later retrieval by a sequencer
191 * or other mechanism.
192 */
193int trace_seq_puts(struct trace_seq *s, const char *str)
194{
195 int len = strlen(str);
196
197 if (s->full)
198 return 0;
199
200 if (len > ((PAGE_SIZE - 1) - s->len)) {
201 s->full = 1;
202 return 0;
203 }
204
205 memcpy(s->buffer + s->len, str, len);
206 s->len += len;
207
208 return len;
209}
210
211int trace_seq_putc(struct trace_seq *s, unsigned char c)
212{
213 if (s->full)
214 return 0;
215
216 if (s->len >= (PAGE_SIZE - 1)) {
217 s->full = 1;
218 return 0;
219 }
220
221 s->buffer[s->len++] = c;
222
223 return 1;
224}
225EXPORT_SYMBOL(trace_seq_putc);
226
227int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
228{
229 if (s->full)
230 return 0;
231
232 if (len > ((PAGE_SIZE - 1) - s->len)) {
233 s->full = 1;
234 return 0;
235 }
236
237 memcpy(s->buffer + s->len, mem, len);
238 s->len += len;
239
240 return len;
241}
242
243int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
244{
245 unsigned char hex[HEX_CHARS];
246 const unsigned char *data = mem;
247 int i, j;
248
249 if (s->full)
250 return 0;
251
252#ifdef __BIG_ENDIAN
253 for (i = 0, j = 0; i < len; i++) {
254#else
255 for (i = len-1, j = 0; i >= 0; i--) {
256#endif
257 hex[j++] = hex_asc_hi(data[i]);
258 hex[j++] = hex_asc_lo(data[i]);
259 }
260 hex[j++] = ' ';
261
262 return trace_seq_putmem(s, hex, j);
263}
264
265void *trace_seq_reserve(struct trace_seq *s, size_t len)
266{
267 void *ret;
268
269 if (s->full)
270 return NULL;
271
272 if (len > ((PAGE_SIZE - 1) - s->len)) {
273 s->full = 1;
274 return NULL;
275 }
276
277 ret = s->buffer + s->len;
278 s->len += len;
279
280 return ret;
281}
282
283int trace_seq_path(struct trace_seq *s, const struct path *path)
284{
285 unsigned char *p;
286
287 if (s->full)
288 return 0;
289
290 if (s->len >= (PAGE_SIZE - 1)) {
291 s->full = 1;
292 return 0;
293 }
294
295 p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
296 if (!IS_ERR(p)) {
297 p = mangle_path(s->buffer + s->len, p, "\n");
298 if (p) {
299 s->len = p - s->buffer;
300 return 1;
301 }
302 } else {
303 s->buffer[s->len++] = '?';
304 return 1;
305 }
306
307 s->full = 1;
308 return 0;
309}
310
311const char *
312ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
313 unsigned long flags,
314 const struct trace_print_flags *flag_array)
315{
316 unsigned long mask;
317 const char *str;
318 const char *ret = p->buffer + p->len;
319 int i, first = 1;
320
321 for (i = 0; flag_array[i].name && flags; i++) {
322
323 mask = flag_array[i].mask;
324 if ((flags & mask) != mask)
325 continue;
326
327 str = flag_array[i].name;
328 flags &= ~mask;
329 if (!first && delim)
330 trace_seq_puts(p, delim);
331 else
332 first = 0;
333 trace_seq_puts(p, str);
334 }
335
336 /* check for left over flags */
337 if (flags) {
338 if (!first && delim)
339 trace_seq_puts(p, delim);
340 trace_seq_printf(p, "0x%lx", flags);
341 }
342
343 trace_seq_putc(p, 0);
344
345 return ret;
346}
347EXPORT_SYMBOL(ftrace_print_flags_seq);
348
349const char *
350ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
351 const struct trace_print_flags *symbol_array)
352{
353 int i;
354 const char *ret = p->buffer + p->len;
355
356 for (i = 0; symbol_array[i].name; i++) {
357
358 if (val != symbol_array[i].mask)
359 continue;
360
361 trace_seq_puts(p, symbol_array[i].name);
362 break;
363 }
364
365 if (ret == (const char *)(p->buffer + p->len))
366 trace_seq_printf(p, "0x%lx", val);
367
368 trace_seq_putc(p, 0);
369
370 return ret;
371}
372EXPORT_SYMBOL(ftrace_print_symbols_seq);
373
374#if BITS_PER_LONG == 32
375const char *
376ftrace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
377 const struct trace_print_flags_u64 *symbol_array)
378{
379 int i;
380 const char *ret = p->buffer + p->len;
381
382 for (i = 0; symbol_array[i].name; i++) {
383
384 if (val != symbol_array[i].mask)
385 continue;
386
387 trace_seq_puts(p, symbol_array[i].name);
388 break;
389 }
390
391 if (ret == (const char *)(p->buffer + p->len))
392 trace_seq_printf(p, "0x%llx", val);
393
394 trace_seq_putc(p, 0);
395
396 return ret;
397}
398EXPORT_SYMBOL(ftrace_print_symbols_seq_u64);
399#endif
400
401const char *
402ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
403{
404 int i;
405 const char *ret = p->buffer + p->len;
406
407 for (i = 0; i < buf_len; i++)
408 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
409
410 trace_seq_putc(p, 0);
411
412 return ret;
413}
414EXPORT_SYMBOL(ftrace_print_hex_seq);
415
416int ftrace_raw_output_prep(struct trace_iterator *iter,
417 struct trace_event *trace_event)
418{
419 struct ftrace_event_call *event;
420 struct trace_seq *s = &iter->seq;
421 struct trace_seq *p = &iter->tmp_seq;
422 struct trace_entry *entry;
423 int ret;
424
425 event = container_of(trace_event, struct ftrace_event_call, event);
426 entry = iter->ent;
427
428 if (entry->type != event->event.type) {
429 WARN_ON_ONCE(1);
430 return TRACE_TYPE_UNHANDLED;
431 }
432
433 trace_seq_init(p);
434 ret = trace_seq_printf(s, "%s: ", ftrace_event_name(event));
435 if (!ret)
436 return TRACE_TYPE_PARTIAL_LINE;
437
438 return 0;
439}
440EXPORT_SYMBOL(ftrace_raw_output_prep);
441
442static int ftrace_output_raw(struct trace_iterator *iter, char *name,
443 char *fmt, va_list ap)
444{
445 struct trace_seq *s = &iter->seq;
446 int ret;
447
448 ret = trace_seq_printf(s, "%s: ", name);
449 if (!ret)
450 return TRACE_TYPE_PARTIAL_LINE;
451
452 ret = trace_seq_vprintf(s, fmt, ap);
453
454 if (!ret)
455 return TRACE_TYPE_PARTIAL_LINE;
456
457 return TRACE_TYPE_HANDLED;
458}
459
460int ftrace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
461{
462 va_list ap;
463 int ret;
464
465 va_start(ap, fmt);
466 ret = ftrace_output_raw(iter, name, fmt, ap);
467 va_end(ap);
468
469 return ret;
470}
471EXPORT_SYMBOL_GPL(ftrace_output_call);
472
473#ifdef CONFIG_KRETPROBES
474static inline const char *kretprobed(const char *name)
475{
476 static const char tramp_name[] = "kretprobe_trampoline";
477 int size = sizeof(tramp_name);
478
479 if (strncmp(tramp_name, name, size) == 0)
480 return "[unknown/kretprobe'd]";
481 return name;
482}
483#else
484static inline const char *kretprobed(const char *name)
485{
486 return name;
487}
488#endif /* CONFIG_KRETPROBES */
489
490static int
491seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
492{
493#ifdef CONFIG_KALLSYMS
494 char str[KSYM_SYMBOL_LEN];
495 const char *name;
496
497 kallsyms_lookup(address, NULL, NULL, NULL, str);
498
499 name = kretprobed(str);
500
501 return trace_seq_printf(s, fmt, name);
502#endif
503 return 1;
504}
505
506static int
507seq_print_sym_offset(struct trace_seq *s, const char *fmt,
508 unsigned long address)
509{
510#ifdef CONFIG_KALLSYMS
511 char str[KSYM_SYMBOL_LEN];
512 const char *name;
513
514 sprint_symbol(str, address);
515 name = kretprobed(str);
516
517 return trace_seq_printf(s, fmt, name);
518#endif
519 return 1;
520}
521
522#ifndef CONFIG_64BIT
523# define IP_FMT "%08lx"
524#else
525# define IP_FMT "%016lx"
526#endif
527
528int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
529 unsigned long ip, unsigned long sym_flags)
530{
531 struct file *file = NULL;
532 unsigned long vmstart = 0;
533 int ret = 1;
534
535 if (s->full)
536 return 0;
537
538 if (mm) {
539 const struct vm_area_struct *vma;
540
541 down_read(&mm->mmap_sem);
542 vma = find_vma(mm, ip);
543 if (vma) {
544 file = vma->vm_file;
545 vmstart = vma->vm_start;
546 }
547 if (file) {
548 ret = trace_seq_path(s, &file->f_path);
549 if (ret)
550 ret = trace_seq_printf(s, "[+0x%lx]",
551 ip - vmstart);
552 }
553 up_read(&mm->mmap_sem);
554 }
555 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
556 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
557 return ret;
558}
559
560int
561seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
562 unsigned long sym_flags)
563{
564 struct mm_struct *mm = NULL;
565 int ret = 1;
566 unsigned int i;
567
568 if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
569 struct task_struct *task;
570 /*
571 * we do the lookup on the thread group leader,
572 * since individual threads might have already quit!
573 */
574 rcu_read_lock();
575 task = find_task_by_vpid(entry->tgid);
576 if (task)
577 mm = get_task_mm(task);
578 rcu_read_unlock();
579 }
580
581 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
582 unsigned long ip = entry->caller[i];
583
584 if (ip == ULONG_MAX || !ret)
585 break;
586 if (ret)
587 ret = trace_seq_puts(s, " => ");
588 if (!ip) {
589 if (ret)
590 ret = trace_seq_puts(s, "??");
591 if (ret)
592 ret = trace_seq_putc(s, '\n');
593 continue;
594 }
595 if (!ret)
596 break;
597 if (ret)
598 ret = seq_print_user_ip(s, mm, ip, sym_flags);
599 ret = trace_seq_putc(s, '\n');
600 }
601
602 if (mm)
603 mmput(mm);
604 return ret;
605}
606
607int
608seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
609{
610 int ret;
611
612 if (!ip)
613 return trace_seq_putc(s, '0');
614
615 if (sym_flags & TRACE_ITER_SYM_OFFSET)
616 ret = seq_print_sym_offset(s, "%s", ip);
617 else
618 ret = seq_print_sym_short(s, "%s", ip);
619
620 if (!ret)
621 return 0;
622
623 if (sym_flags & TRACE_ITER_SYM_ADDR)
624 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
625 return ret;
626}
627
628/**
629 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
630 * @s: trace seq struct to write to
631 * @entry: The trace entry field from the ring buffer
632 *
633 * Prints the generic fields of irqs off, in hard or softirq, preempt
634 * count.
635 */
636int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
637{
638 char hardsoft_irq;
639 char need_resched;
640 char irqs_off;
641 int hardirq;
642 int softirq;
643 int ret;
644
645 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
646 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
647
648 irqs_off =
649 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
650 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
651 '.';
652
653 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
654 TRACE_FLAG_PREEMPT_RESCHED)) {
655 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
656 need_resched = 'N';
657 break;
658 case TRACE_FLAG_NEED_RESCHED:
659 need_resched = 'n';
660 break;
661 case TRACE_FLAG_PREEMPT_RESCHED:
662 need_resched = 'p';
663 break;
664 default:
665 need_resched = '.';
666 break;
667 }
668
669 hardsoft_irq =
670 (hardirq && softirq) ? 'H' :
671 hardirq ? 'h' :
672 softirq ? 's' :
673 '.';
674
675 if (!trace_seq_printf(s, "%c%c%c",
676 irqs_off, need_resched, hardsoft_irq))
677 return 0;
678
679 if (entry->preempt_count)
680 ret = trace_seq_printf(s, "%x", entry->preempt_count);
681 else
682 ret = trace_seq_putc(s, '.');
683
684 return ret;
685}
686
687static int
688lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
689{
690 char comm[TASK_COMM_LEN];
691
692 trace_find_cmdline(entry->pid, comm);
693
694 if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
695 comm, entry->pid, cpu))
696 return 0;
697
698 return trace_print_lat_fmt(s, entry);
699}
700
701static unsigned long preempt_mark_thresh_us = 100;
702
703static int
704lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
705{
706 unsigned long verbose = trace_flags & TRACE_ITER_VERBOSE;
707 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
708 unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start;
709 unsigned long long rel_ts = next_ts - iter->ts;
710 struct trace_seq *s = &iter->seq;
711
712 if (in_ns) {
713 abs_ts = ns2usecs(abs_ts);
714 rel_ts = ns2usecs(rel_ts);
715 }
716
717 if (verbose && in_ns) {
718 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
719 unsigned long abs_msec = (unsigned long)abs_ts;
720 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
721 unsigned long rel_msec = (unsigned long)rel_ts;
722
723 return trace_seq_printf(
724 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
725 ns2usecs(iter->ts),
726 abs_msec, abs_usec,
727 rel_msec, rel_usec);
728 } else if (verbose && !in_ns) {
729 return trace_seq_printf(
730 s, "[%016llx] %lld (+%lld): ",
731 iter->ts, abs_ts, rel_ts);
732 } else if (!verbose && in_ns) {
733 return trace_seq_printf(
734 s, " %4lldus%c: ",
735 abs_ts,
736 rel_ts > preempt_mark_thresh_us ? '!' :
737 rel_ts > 1 ? '+' : ' ');
738 } else { /* !verbose && !in_ns */
739 return trace_seq_printf(s, " %4lld: ", abs_ts);
740 }
741}
742
743int trace_print_context(struct trace_iterator *iter)
744{
745 struct trace_seq *s = &iter->seq;
746 struct trace_entry *entry = iter->ent;
747 unsigned long long t;
748 unsigned long secs, usec_rem;
749 char comm[TASK_COMM_LEN];
750 int ret;
751
752 trace_find_cmdline(entry->pid, comm);
753
754 ret = trace_seq_printf(s, "%16s-%-5d [%03d] ",
755 comm, entry->pid, iter->cpu);
756 if (!ret)
757 return 0;
758
759 if (trace_flags & TRACE_ITER_IRQ_INFO) {
760 ret = trace_print_lat_fmt(s, entry);
761 if (!ret)
762 return 0;
763 }
764
765 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
766 t = ns2usecs(iter->ts);
767 usec_rem = do_div(t, USEC_PER_SEC);
768 secs = (unsigned long)t;
769 return trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
770 } else
771 return trace_seq_printf(s, " %12llu: ", iter->ts);
772}
773
774int trace_print_lat_context(struct trace_iterator *iter)
775{
776 u64 next_ts;
777 int ret;
778 /* trace_find_next_entry will reset ent_size */
779 int ent_size = iter->ent_size;
780 struct trace_seq *s = &iter->seq;
781 struct trace_entry *entry = iter->ent,
782 *next_entry = trace_find_next_entry(iter, NULL,
783 &next_ts);
784 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
785
786 /* Restore the original ent_size */
787 iter->ent_size = ent_size;
788
789 if (!next_entry)
790 next_ts = iter->ts;
791
792 if (verbose) {
793 char comm[TASK_COMM_LEN];
794
795 trace_find_cmdline(entry->pid, comm);
796
797 ret = trace_seq_printf(
798 s, "%16s %5d %3d %d %08x %08lx ",
799 comm, entry->pid, iter->cpu, entry->flags,
800 entry->preempt_count, iter->idx);
801 } else {
802 ret = lat_print_generic(s, entry, iter->cpu);
803 }
804
805 if (ret)
806 ret = lat_print_timestamp(iter, next_ts);
807
808 return ret;
809}
810
811static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
812
813static int task_state_char(unsigned long state)
814{
815 int bit = state ? __ffs(state) + 1 : 0;
816
817 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
818}
819
820/**
821 * ftrace_find_event - find a registered event
822 * @type: the type of event to look for
823 *
824 * Returns an event of type @type otherwise NULL
825 * Called with trace_event_read_lock() held.
826 */
827struct trace_event *ftrace_find_event(int type)
828{
829 struct trace_event *event;
830 unsigned key;
831
832 key = type & (EVENT_HASHSIZE - 1);
833
834 hlist_for_each_entry(event, &event_hash[key], node) {
835 if (event->type == type)
836 return event;
837 }
838
839 return NULL;
840}
841
842static LIST_HEAD(ftrace_event_list);
843
844static int trace_search_list(struct list_head **list)
845{
846 struct trace_event *e;
847 int last = __TRACE_LAST_TYPE;
848
849 if (list_empty(&ftrace_event_list)) {
850 *list = &ftrace_event_list;
851 return last + 1;
852 }
853
854 /*
855 * We used up all possible max events,
856 * lets see if somebody freed one.
857 */
858 list_for_each_entry(e, &ftrace_event_list, list) {
859 if (e->type != last + 1)
860 break;
861 last++;
862 }
863
864 /* Did we used up all 65 thousand events??? */
865 if ((last + 1) > FTRACE_MAX_EVENT)
866 return 0;
867
868 *list = &e->list;
869 return last + 1;
870}
871
872void trace_event_read_lock(void)
873{
874 down_read(&trace_event_sem);
875}
876
877void trace_event_read_unlock(void)
878{
879 up_read(&trace_event_sem);
880}
881
882/**
883 * register_ftrace_event - register output for an event type
884 * @event: the event type to register
885 *
886 * Event types are stored in a hash and this hash is used to
887 * find a way to print an event. If the @event->type is set
888 * then it will use that type, otherwise it will assign a
889 * type to use.
890 *
891 * If you assign your own type, please make sure it is added
892 * to the trace_type enum in trace.h, to avoid collisions
893 * with the dynamic types.
894 *
895 * Returns the event type number or zero on error.
896 */
897int register_ftrace_event(struct trace_event *event)
898{
899 unsigned key;
900 int ret = 0;
901
902 down_write(&trace_event_sem);
903
904 if (WARN_ON(!event))
905 goto out;
906
907 if (WARN_ON(!event->funcs))
908 goto out;
909
910 INIT_LIST_HEAD(&event->list);
911
912 if (!event->type) {
913 struct list_head *list = NULL;
914
915 if (next_event_type > FTRACE_MAX_EVENT) {
916
917 event->type = trace_search_list(&list);
918 if (!event->type)
919 goto out;
920
921 } else {
922
923 event->type = next_event_type++;
924 list = &ftrace_event_list;
925 }
926
927 if (WARN_ON(ftrace_find_event(event->type)))
928 goto out;
929
930 list_add_tail(&event->list, list);
931
932 } else if (event->type > __TRACE_LAST_TYPE) {
933 printk(KERN_WARNING "Need to add type to trace.h\n");
934 WARN_ON(1);
935 goto out;
936 } else {
937 /* Is this event already used */
938 if (ftrace_find_event(event->type))
939 goto out;
940 }
941
942 if (event->funcs->trace == NULL)
943 event->funcs->trace = trace_nop_print;
944 if (event->funcs->raw == NULL)
945 event->funcs->raw = trace_nop_print;
946 if (event->funcs->hex == NULL)
947 event->funcs->hex = trace_nop_print;
948 if (event->funcs->binary == NULL)
949 event->funcs->binary = trace_nop_print;
950
951 key = event->type & (EVENT_HASHSIZE - 1);
952
953 hlist_add_head(&event->node, &event_hash[key]);
954
955 ret = event->type;
956 out:
957 up_write(&trace_event_sem);
958
959 return ret;
960}
961EXPORT_SYMBOL_GPL(register_ftrace_event);
962
963/*
964 * Used by module code with the trace_event_sem held for write.
965 */
966int __unregister_ftrace_event(struct trace_event *event)
967{
968 hlist_del(&event->node);
969 list_del(&event->list);
970 return 0;
971}
972
973/**
974 * unregister_ftrace_event - remove a no longer used event
975 * @event: the event to remove
976 */
977int unregister_ftrace_event(struct trace_event *event)
978{
979 down_write(&trace_event_sem);
980 __unregister_ftrace_event(event);
981 up_write(&trace_event_sem);
982
983 return 0;
984}
985EXPORT_SYMBOL_GPL(unregister_ftrace_event);
986
987/*
988 * Standard events
989 */
990
991enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
992 struct trace_event *event)
993{
994 if (!trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type))
995 return TRACE_TYPE_PARTIAL_LINE;
996
997 return TRACE_TYPE_HANDLED;
998}
999
1000/* TRACE_FN */
1001static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
1002 struct trace_event *event)
1003{
1004 struct ftrace_entry *field;
1005 struct trace_seq *s = &iter->seq;
1006
1007 trace_assign_type(field, iter->ent);
1008
1009 if (!seq_print_ip_sym(s, field->ip, flags))
1010 goto partial;
1011
1012 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
1013 if (!trace_seq_puts(s, " <-"))
1014 goto partial;
1015 if (!seq_print_ip_sym(s,
1016 field->parent_ip,
1017 flags))
1018 goto partial;
1019 }
1020 if (!trace_seq_putc(s, '\n'))
1021 goto partial;
1022
1023 return TRACE_TYPE_HANDLED;
1024
1025 partial:
1026 return TRACE_TYPE_PARTIAL_LINE;
1027}
1028
1029static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
1030 struct trace_event *event)
1031{
1032 struct ftrace_entry *field;
1033
1034 trace_assign_type(field, iter->ent);
1035
1036 if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
1037 field->ip,
1038 field->parent_ip))
1039 return TRACE_TYPE_PARTIAL_LINE;
1040
1041 return TRACE_TYPE_HANDLED;
1042}
1043
1044static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
1045 struct trace_event *event)
1046{
1047 struct ftrace_entry *field;
1048 struct trace_seq *s = &iter->seq;
1049
1050 trace_assign_type(field, iter->ent);
1051
1052 SEQ_PUT_HEX_FIELD_RET(s, field->ip);
1053 SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
1054
1055 return TRACE_TYPE_HANDLED;
1056}
1057
1058static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
1059 struct trace_event *event)
1060{
1061 struct ftrace_entry *field;
1062 struct trace_seq *s = &iter->seq;
1063
1064 trace_assign_type(field, iter->ent);
1065
1066 SEQ_PUT_FIELD_RET(s, field->ip);
1067 SEQ_PUT_FIELD_RET(s, field->parent_ip);
1068
1069 return TRACE_TYPE_HANDLED;
1070}
1071
1072static struct trace_event_functions trace_fn_funcs = {
1073 .trace = trace_fn_trace,
1074 .raw = trace_fn_raw,
1075 .hex = trace_fn_hex,
1076 .binary = trace_fn_bin,
1077};
1078
1079static struct trace_event trace_fn_event = {
1080 .type = TRACE_FN,
1081 .funcs = &trace_fn_funcs,
1082};
1083
1084/* TRACE_CTX an TRACE_WAKE */
1085static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
1086 char *delim)
1087{
1088 struct ctx_switch_entry *field;
1089 char comm[TASK_COMM_LEN];
1090 int S, T;
1091
1092
1093 trace_assign_type(field, iter->ent);
1094
1095 T = task_state_char(field->next_state);
1096 S = task_state_char(field->prev_state);
1097 trace_find_cmdline(field->next_pid, comm);
1098 if (!trace_seq_printf(&iter->seq,
1099 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
1100 field->prev_pid,
1101 field->prev_prio,
1102 S, delim,
1103 field->next_cpu,
1104 field->next_pid,
1105 field->next_prio,
1106 T, comm))
1107 return TRACE_TYPE_PARTIAL_LINE;
1108
1109 return TRACE_TYPE_HANDLED;
1110}
1111
1112static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
1113 struct trace_event *event)
1114{
1115 return trace_ctxwake_print(iter, "==>");
1116}
1117
1118static enum print_line_t trace_wake_print(struct trace_iterator *iter,
1119 int flags, struct trace_event *event)
1120{
1121 return trace_ctxwake_print(iter, " +");
1122}
1123
1124static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
1125{
1126 struct ctx_switch_entry *field;
1127 int T;
1128
1129 trace_assign_type(field, iter->ent);
1130
1131 if (!S)
1132 S = task_state_char(field->prev_state);
1133 T = task_state_char(field->next_state);
1134 if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
1135 field->prev_pid,
1136 field->prev_prio,
1137 S,
1138 field->next_cpu,
1139 field->next_pid,
1140 field->next_prio,
1141 T))
1142 return TRACE_TYPE_PARTIAL_LINE;
1143
1144 return TRACE_TYPE_HANDLED;
1145}
1146
1147static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
1148 struct trace_event *event)
1149{
1150 return trace_ctxwake_raw(iter, 0);
1151}
1152
1153static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
1154 struct trace_event *event)
1155{
1156 return trace_ctxwake_raw(iter, '+');
1157}
1158
1159
1160static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
1161{
1162 struct ctx_switch_entry *field;
1163 struct trace_seq *s = &iter->seq;
1164 int T;
1165
1166 trace_assign_type(field, iter->ent);
1167
1168 if (!S)
1169 S = task_state_char(field->prev_state);
1170 T = task_state_char(field->next_state);
1171
1172 SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
1173 SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
1174 SEQ_PUT_HEX_FIELD_RET(s, S);
1175 SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
1176 SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
1177 SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
1178 SEQ_PUT_HEX_FIELD_RET(s, T);
1179
1180 return TRACE_TYPE_HANDLED;
1181}
1182
1183static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1184 struct trace_event *event)
1185{
1186 return trace_ctxwake_hex(iter, 0);
1187}
1188
1189static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1190 struct trace_event *event)
1191{
1192 return trace_ctxwake_hex(iter, '+');
1193}
1194
1195static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1196 int flags, struct trace_event *event)
1197{
1198 struct ctx_switch_entry *field;
1199 struct trace_seq *s = &iter->seq;
1200
1201 trace_assign_type(field, iter->ent);
1202
1203 SEQ_PUT_FIELD_RET(s, field->prev_pid);
1204 SEQ_PUT_FIELD_RET(s, field->prev_prio);
1205 SEQ_PUT_FIELD_RET(s, field->prev_state);
1206 SEQ_PUT_FIELD_RET(s, field->next_pid);
1207 SEQ_PUT_FIELD_RET(s, field->next_prio);
1208 SEQ_PUT_FIELD_RET(s, field->next_state);
1209
1210 return TRACE_TYPE_HANDLED;
1211}
1212
1213static struct trace_event_functions trace_ctx_funcs = {
1214 .trace = trace_ctx_print,
1215 .raw = trace_ctx_raw,
1216 .hex = trace_ctx_hex,
1217 .binary = trace_ctxwake_bin,
1218};
1219
1220static struct trace_event trace_ctx_event = {
1221 .type = TRACE_CTX,
1222 .funcs = &trace_ctx_funcs,
1223};
1224
1225static struct trace_event_functions trace_wake_funcs = {
1226 .trace = trace_wake_print,
1227 .raw = trace_wake_raw,
1228 .hex = trace_wake_hex,
1229 .binary = trace_ctxwake_bin,
1230};
1231
1232static struct trace_event trace_wake_event = {
1233 .type = TRACE_WAKE,
1234 .funcs = &trace_wake_funcs,
1235};
1236
1237/* TRACE_STACK */
1238
1239static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1240 int flags, struct trace_event *event)
1241{
1242 struct stack_entry *field;
1243 struct trace_seq *s = &iter->seq;
1244 unsigned long *p;
1245 unsigned long *end;
1246
1247 trace_assign_type(field, iter->ent);
1248 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1249
1250 if (!trace_seq_puts(s, "<stack trace>\n"))
1251 goto partial;
1252
1253 for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1254 if (!trace_seq_puts(s, " => "))
1255 goto partial;
1256
1257 if (!seq_print_ip_sym(s, *p, flags))
1258 goto partial;
1259 if (!trace_seq_putc(s, '\n'))
1260 goto partial;
1261 }
1262
1263 return TRACE_TYPE_HANDLED;
1264
1265 partial:
1266 return TRACE_TYPE_PARTIAL_LINE;
1267}
1268
1269static struct trace_event_functions trace_stack_funcs = {
1270 .trace = trace_stack_print,
1271};
1272
1273static struct trace_event trace_stack_event = {
1274 .type = TRACE_STACK,
1275 .funcs = &trace_stack_funcs,
1276};
1277
1278/* TRACE_USER_STACK */
1279static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1280 int flags, struct trace_event *event)
1281{
1282 struct userstack_entry *field;
1283 struct trace_seq *s = &iter->seq;
1284
1285 trace_assign_type(field, iter->ent);
1286
1287 if (!trace_seq_puts(s, "<user stack trace>\n"))
1288 goto partial;
1289
1290 if (!seq_print_userip_objs(field, s, flags))
1291 goto partial;
1292
1293 return TRACE_TYPE_HANDLED;
1294
1295 partial:
1296 return TRACE_TYPE_PARTIAL_LINE;
1297}
1298
1299static struct trace_event_functions trace_user_stack_funcs = {
1300 .trace = trace_user_stack_print,
1301};
1302
1303static struct trace_event trace_user_stack_event = {
1304 .type = TRACE_USER_STACK,
1305 .funcs = &trace_user_stack_funcs,
1306};
1307
1308/* TRACE_BPUTS */
1309static enum print_line_t
1310trace_bputs_print(struct trace_iterator *iter, int flags,
1311 struct trace_event *event)
1312{
1313 struct trace_entry *entry = iter->ent;
1314 struct trace_seq *s = &iter->seq;
1315 struct bputs_entry *field;
1316
1317 trace_assign_type(field, entry);
1318
1319 if (!seq_print_ip_sym(s, field->ip, flags))
1320 goto partial;
1321
1322 if (!trace_seq_puts(s, ": "))
1323 goto partial;
1324
1325 if (!trace_seq_puts(s, field->str))
1326 goto partial;
1327
1328 return TRACE_TYPE_HANDLED;
1329
1330 partial:
1331 return TRACE_TYPE_PARTIAL_LINE;
1332}
1333
1334
1335static enum print_line_t
1336trace_bputs_raw(struct trace_iterator *iter, int flags,
1337 struct trace_event *event)
1338{
1339 struct bputs_entry *field;
1340 struct trace_seq *s = &iter->seq;
1341
1342 trace_assign_type(field, iter->ent);
1343
1344 if (!trace_seq_printf(s, ": %lx : ", field->ip))
1345 goto partial;
1346
1347 if (!trace_seq_puts(s, field->str))
1348 goto partial;
1349
1350 return TRACE_TYPE_HANDLED;
1351
1352 partial:
1353 return TRACE_TYPE_PARTIAL_LINE;
1354}
1355
1356static struct trace_event_functions trace_bputs_funcs = {
1357 .trace = trace_bputs_print,
1358 .raw = trace_bputs_raw,
1359};
1360
1361static struct trace_event trace_bputs_event = {
1362 .type = TRACE_BPUTS,
1363 .funcs = &trace_bputs_funcs,
1364};
1365
1366/* TRACE_BPRINT */
1367static enum print_line_t
1368trace_bprint_print(struct trace_iterator *iter, int flags,
1369 struct trace_event *event)
1370{
1371 struct trace_entry *entry = iter->ent;
1372 struct trace_seq *s = &iter->seq;
1373 struct bprint_entry *field;
1374
1375 trace_assign_type(field, entry);
1376
1377 if (!seq_print_ip_sym(s, field->ip, flags))
1378 goto partial;
1379
1380 if (!trace_seq_puts(s, ": "))
1381 goto partial;
1382
1383 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1384 goto partial;
1385
1386 return TRACE_TYPE_HANDLED;
1387
1388 partial:
1389 return TRACE_TYPE_PARTIAL_LINE;
1390}
1391
1392
1393static enum print_line_t
1394trace_bprint_raw(struct trace_iterator *iter, int flags,
1395 struct trace_event *event)
1396{
1397 struct bprint_entry *field;
1398 struct trace_seq *s = &iter->seq;
1399
1400 trace_assign_type(field, iter->ent);
1401
1402 if (!trace_seq_printf(s, ": %lx : ", field->ip))
1403 goto partial;
1404
1405 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1406 goto partial;
1407
1408 return TRACE_TYPE_HANDLED;
1409
1410 partial:
1411 return TRACE_TYPE_PARTIAL_LINE;
1412}
1413
1414static struct trace_event_functions trace_bprint_funcs = {
1415 .trace = trace_bprint_print,
1416 .raw = trace_bprint_raw,
1417};
1418
1419static struct trace_event trace_bprint_event = {
1420 .type = TRACE_BPRINT,
1421 .funcs = &trace_bprint_funcs,
1422};
1423
1424/* TRACE_PRINT */
1425static enum print_line_t trace_print_print(struct trace_iterator *iter,
1426 int flags, struct trace_event *event)
1427{
1428 struct print_entry *field;
1429 struct trace_seq *s = &iter->seq;
1430
1431 trace_assign_type(field, iter->ent);
1432
1433 if (!seq_print_ip_sym(s, field->ip, flags))
1434 goto partial;
1435
1436 if (!trace_seq_printf(s, ": %s", field->buf))
1437 goto partial;
1438
1439 return TRACE_TYPE_HANDLED;
1440
1441 partial:
1442 return TRACE_TYPE_PARTIAL_LINE;
1443}
1444
1445static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1446 struct trace_event *event)
1447{
1448 struct print_entry *field;
1449
1450 trace_assign_type(field, iter->ent);
1451
1452 if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1453 goto partial;
1454
1455 return TRACE_TYPE_HANDLED;
1456
1457 partial:
1458 return TRACE_TYPE_PARTIAL_LINE;
1459}
1460
1461static struct trace_event_functions trace_print_funcs = {
1462 .trace = trace_print_print,
1463 .raw = trace_print_raw,
1464};
1465
1466static struct trace_event trace_print_event = {
1467 .type = TRACE_PRINT,
1468 .funcs = &trace_print_funcs,
1469};
1470
1471
1472static struct trace_event *events[] __initdata = {
1473 &trace_fn_event,
1474 &trace_ctx_event,
1475 &trace_wake_event,
1476 &trace_stack_event,
1477 &trace_user_stack_event,
1478 &trace_bputs_event,
1479 &trace_bprint_event,
1480 &trace_print_event,
1481 NULL
1482};
1483
1484__init static int init_events(void)
1485{
1486 struct trace_event *event;
1487 int i, ret;
1488
1489 for (i = 0; events[i]; i++) {
1490 event = events[i];
1491
1492 ret = register_ftrace_event(event);
1493 if (!ret) {
1494 printk(KERN_WARNING "event %d failed to register\n",
1495 event->type);
1496 WARN_ON_ONCE(1);
1497 }
1498 }
1499
1500 return 0;
1501}
1502early_initcall(init_events);