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