1 /*
2 * trace_output.c
3 *
4 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
5 *
6 */
7 #include <linux/module.h>
8 #include <linux/mutex.h>
9 #include <linux/ftrace.h>
10 #include <linux/sched/clock.h>
11 #include <linux/sched/mm.h>
12
13 #include "trace_output.h"
14
15 /* must be a power of 2 */
16 #define EVENT_HASHSIZE 128
17
18 DECLARE_RWSEM(trace_event_sem);
19
20 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
21
22 static int next_event_type = __TRACE_LAST_TYPE + 1;
23
trace_print_bputs_msg_only(struct trace_iterator * iter)24 enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
25 {
26 struct trace_seq *s = &iter->seq;
27 struct trace_entry *entry = iter->ent;
28 struct bputs_entry *field;
29
30 trace_assign_type(field, entry);
31
32 trace_seq_puts(s, field->str);
33
34 return trace_handle_return(s);
35 }
36
trace_print_bprintk_msg_only(struct trace_iterator * iter)37 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
38 {
39 struct trace_seq *s = &iter->seq;
40 struct trace_entry *entry = iter->ent;
41 struct bprint_entry *field;
42
43 trace_assign_type(field, entry);
44
45 trace_seq_bprintf(s, field->fmt, field->buf);
46
47 return trace_handle_return(s);
48 }
49
trace_print_printk_msg_only(struct trace_iterator * iter)50 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
51 {
52 struct trace_seq *s = &iter->seq;
53 struct trace_entry *entry = iter->ent;
54 struct print_entry *field;
55
56 trace_assign_type(field, entry);
57
58 trace_seq_puts(s, field->buf);
59
60 return trace_handle_return(s);
61 }
62
63 const char *
trace_print_flags_seq(struct trace_seq * p,const char * delim,unsigned long flags,const struct trace_print_flags * flag_array)64 trace_print_flags_seq(struct trace_seq *p, const char *delim,
65 unsigned long flags,
66 const struct trace_print_flags *flag_array)
67 {
68 unsigned long mask;
69 const char *str;
70 const char *ret = trace_seq_buffer_ptr(p);
71 int i, first = 1;
72
73 for (i = 0; flag_array[i].name && flags; i++) {
74
75 mask = flag_array[i].mask;
76 if ((flags & mask) != mask)
77 continue;
78
79 str = flag_array[i].name;
80 flags &= ~mask;
81 if (!first && delim)
82 trace_seq_puts(p, delim);
83 else
84 first = 0;
85 trace_seq_puts(p, str);
86 }
87
88 /* check for left over flags */
89 if (flags) {
90 if (!first && delim)
91 trace_seq_puts(p, delim);
92 trace_seq_printf(p, "0x%lx", flags);
93 }
94
95 trace_seq_putc(p, 0);
96
97 return ret;
98 }
99 EXPORT_SYMBOL(trace_print_flags_seq);
100
101 const char *
trace_print_symbols_seq(struct trace_seq * p,unsigned long val,const struct trace_print_flags * symbol_array)102 trace_print_symbols_seq(struct trace_seq *p, unsigned long val,
103 const struct trace_print_flags *symbol_array)
104 {
105 int i;
106 const char *ret = trace_seq_buffer_ptr(p);
107
108 for (i = 0; symbol_array[i].name; i++) {
109
110 if (val != symbol_array[i].mask)
111 continue;
112
113 trace_seq_puts(p, symbol_array[i].name);
114 break;
115 }
116
117 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
118 trace_seq_printf(p, "0x%lx", val);
119
120 trace_seq_putc(p, 0);
121
122 return ret;
123 }
124 EXPORT_SYMBOL(trace_print_symbols_seq);
125
126 #if BITS_PER_LONG == 32
127 const char *
trace_print_flags_seq_u64(struct trace_seq * p,const char * delim,unsigned long long flags,const struct trace_print_flags_u64 * flag_array)128 trace_print_flags_seq_u64(struct trace_seq *p, const char *delim,
129 unsigned long long flags,
130 const struct trace_print_flags_u64 *flag_array)
131 {
132 unsigned long long mask;
133 const char *str;
134 const char *ret = trace_seq_buffer_ptr(p);
135 int i, first = 1;
136
137 for (i = 0; flag_array[i].name && flags; i++) {
138
139 mask = flag_array[i].mask;
140 if ((flags & mask) != mask)
141 continue;
142
143 str = flag_array[i].name;
144 flags &= ~mask;
145 if (!first && delim)
146 trace_seq_puts(p, delim);
147 else
148 first = 0;
149 trace_seq_puts(p, str);
150 }
151
152 /* check for left over flags */
153 if (flags) {
154 if (!first && delim)
155 trace_seq_puts(p, delim);
156 trace_seq_printf(p, "0x%llx", flags);
157 }
158
159 trace_seq_putc(p, 0);
160
161 return ret;
162 }
163 EXPORT_SYMBOL(trace_print_flags_seq_u64);
164
165 const char *
trace_print_symbols_seq_u64(struct trace_seq * p,unsigned long long val,const struct trace_print_flags_u64 * symbol_array)166 trace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
167 const struct trace_print_flags_u64 *symbol_array)
168 {
169 int i;
170 const char *ret = trace_seq_buffer_ptr(p);
171
172 for (i = 0; symbol_array[i].name; i++) {
173
174 if (val != symbol_array[i].mask)
175 continue;
176
177 trace_seq_puts(p, symbol_array[i].name);
178 break;
179 }
180
181 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
182 trace_seq_printf(p, "0x%llx", val);
183
184 trace_seq_putc(p, 0);
185
186 return ret;
187 }
188 EXPORT_SYMBOL(trace_print_symbols_seq_u64);
189 #endif
190
191 const char *
trace_print_bitmask_seq(struct trace_seq * p,void * bitmask_ptr,unsigned int bitmask_size)192 trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
193 unsigned int bitmask_size)
194 {
195 const char *ret = trace_seq_buffer_ptr(p);
196
197 trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8);
198 trace_seq_putc(p, 0);
199
200 return ret;
201 }
202 EXPORT_SYMBOL_GPL(trace_print_bitmask_seq);
203
204 /**
205 * trace_print_hex_seq - print buffer as hex sequence
206 * @p: trace seq struct to write to
207 * @buf: The buffer to print
208 * @buf_len: Length of @buf in bytes
209 * @concatenate: Print @buf as single hex string or with spacing
210 *
211 * Prints the passed buffer as a hex sequence either as a whole,
212 * single hex string if @concatenate is true or with spacing after
213 * each byte in case @concatenate is false.
214 */
215 const char *
trace_print_hex_seq(struct trace_seq * p,const unsigned char * buf,int buf_len,bool concatenate)216 trace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len,
217 bool concatenate)
218 {
219 int i;
220 const char *ret = trace_seq_buffer_ptr(p);
221
222 for (i = 0; i < buf_len; i++)
223 trace_seq_printf(p, "%s%2.2x", concatenate || i == 0 ? "" : " ",
224 buf[i]);
225 trace_seq_putc(p, 0);
226
227 return ret;
228 }
229 EXPORT_SYMBOL(trace_print_hex_seq);
230
231 const char *
trace_print_array_seq(struct trace_seq * p,const void * buf,int count,size_t el_size)232 trace_print_array_seq(struct trace_seq *p, const void *buf, int count,
233 size_t el_size)
234 {
235 const char *ret = trace_seq_buffer_ptr(p);
236 const char *prefix = "";
237 void *ptr = (void *)buf;
238 size_t buf_len = count * el_size;
239
240 trace_seq_putc(p, '{');
241
242 while (ptr < buf + buf_len) {
243 switch (el_size) {
244 case 1:
245 trace_seq_printf(p, "%s0x%x", prefix,
246 *(u8 *)ptr);
247 break;
248 case 2:
249 trace_seq_printf(p, "%s0x%x", prefix,
250 *(u16 *)ptr);
251 break;
252 case 4:
253 trace_seq_printf(p, "%s0x%x", prefix,
254 *(u32 *)ptr);
255 break;
256 case 8:
257 trace_seq_printf(p, "%s0x%llx", prefix,
258 *(u64 *)ptr);
259 break;
260 default:
261 trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
262 *(u8 *)ptr);
263 el_size = 1;
264 }
265 prefix = ",";
266 ptr += el_size;
267 }
268
269 trace_seq_putc(p, '}');
270 trace_seq_putc(p, 0);
271
272 return ret;
273 }
274 EXPORT_SYMBOL(trace_print_array_seq);
275
trace_raw_output_prep(struct trace_iterator * iter,struct trace_event * trace_event)276 int trace_raw_output_prep(struct trace_iterator *iter,
277 struct trace_event *trace_event)
278 {
279 struct trace_event_call *event;
280 struct trace_seq *s = &iter->seq;
281 struct trace_seq *p = &iter->tmp_seq;
282 struct trace_entry *entry;
283
284 event = container_of(trace_event, struct trace_event_call, event);
285 entry = iter->ent;
286
287 if (entry->type != event->event.type) {
288 WARN_ON_ONCE(1);
289 return TRACE_TYPE_UNHANDLED;
290 }
291
292 trace_seq_init(p);
293 trace_seq_printf(s, "%s: ", trace_event_name(event));
294
295 return trace_handle_return(s);
296 }
297 EXPORT_SYMBOL(trace_raw_output_prep);
298
trace_output_raw(struct trace_iterator * iter,char * name,char * fmt,va_list ap)299 static int trace_output_raw(struct trace_iterator *iter, char *name,
300 char *fmt, va_list ap)
301 {
302 struct trace_seq *s = &iter->seq;
303
304 trace_seq_printf(s, "%s: ", name);
305 trace_seq_vprintf(s, fmt, ap);
306
307 return trace_handle_return(s);
308 }
309
trace_output_call(struct trace_iterator * iter,char * name,char * fmt,...)310 int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
311 {
312 va_list ap;
313 int ret;
314
315 va_start(ap, fmt);
316 ret = trace_output_raw(iter, name, fmt, ap);
317 va_end(ap);
318
319 return ret;
320 }
321 EXPORT_SYMBOL_GPL(trace_output_call);
322
323 #ifdef CONFIG_KRETPROBES
kretprobed(const char * name)324 static inline const char *kretprobed(const char *name)
325 {
326 static const char tramp_name[] = "kretprobe_trampoline";
327 int size = sizeof(tramp_name);
328
329 if (strncmp(tramp_name, name, size) == 0)
330 return "[unknown/kretprobe'd]";
331 return name;
332 }
333 #else
kretprobed(const char * name)334 static inline const char *kretprobed(const char *name)
335 {
336 return name;
337 }
338 #endif /* CONFIG_KRETPROBES */
339
340 static void
seq_print_sym_short(struct trace_seq * s,const char * fmt,unsigned long address)341 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
342 {
343 char str[KSYM_SYMBOL_LEN];
344 #ifdef CONFIG_KALLSYMS
345 const char *name;
346
347 kallsyms_lookup(address, NULL, NULL, NULL, str);
348
349 name = kretprobed(str);
350
351 if (name && strlen(name)) {
352 trace_seq_printf(s, fmt, name);
353 return;
354 }
355 #endif
356 snprintf(str, KSYM_SYMBOL_LEN, "0x%08lx", address);
357 trace_seq_printf(s, fmt, str);
358 }
359
360 static void
seq_print_sym_offset(struct trace_seq * s,const char * fmt,unsigned long address)361 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
362 unsigned long address)
363 {
364 char str[KSYM_SYMBOL_LEN];
365 #ifdef CONFIG_KALLSYMS
366 const char *name;
367
368 sprint_symbol(str, address);
369 name = kretprobed(str);
370
371 if (name && strlen(name)) {
372 trace_seq_printf(s, fmt, name);
373 return;
374 }
375 #endif
376 snprintf(str, KSYM_SYMBOL_LEN, "0x%08lx", address);
377 trace_seq_printf(s, fmt, str);
378 }
379
380 #ifndef CONFIG_64BIT
381 # define IP_FMT "%08lx"
382 #else
383 # define IP_FMT "%016lx"
384 #endif
385
seq_print_user_ip(struct trace_seq * s,struct mm_struct * mm,unsigned long ip,unsigned long sym_flags)386 static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
387 unsigned long ip, unsigned long sym_flags)
388 {
389 struct file *file = NULL;
390 unsigned long vmstart = 0;
391 int ret = 1;
392
393 if (s->full)
394 return 0;
395
396 if (mm) {
397 const struct vm_area_struct *vma;
398
399 down_read(&mm->mmap_sem);
400 vma = find_vma(mm, ip);
401 if (vma) {
402 file = vma->vm_file;
403 vmstart = vma->vm_start;
404 }
405 if (file) {
406 ret = trace_seq_path(s, &file->f_path);
407 if (ret)
408 trace_seq_printf(s, "[+0x%lx]",
409 ip - vmstart);
410 }
411 up_read(&mm->mmap_sem);
412 }
413 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
414 trace_seq_printf(s, " <" IP_FMT ">", ip);
415 return !trace_seq_has_overflowed(s);
416 }
417
418 int
seq_print_ip_sym(struct trace_seq * s,unsigned long ip,unsigned long sym_flags)419 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
420 {
421 if (!ip) {
422 trace_seq_putc(s, '0');
423 goto out;
424 }
425
426 if (sym_flags & TRACE_ITER_SYM_OFFSET)
427 seq_print_sym_offset(s, "%s", ip);
428 else
429 seq_print_sym_short(s, "%s", ip);
430
431 if (sym_flags & TRACE_ITER_SYM_ADDR)
432 trace_seq_printf(s, " <" IP_FMT ">", ip);
433
434 out:
435 return !trace_seq_has_overflowed(s);
436 }
437
438 /**
439 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
440 * @s: trace seq struct to write to
441 * @entry: The trace entry field from the ring buffer
442 *
443 * Prints the generic fields of irqs off, in hard or softirq, preempt
444 * count.
445 */
trace_print_lat_fmt(struct trace_seq * s,struct trace_entry * entry)446 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
447 {
448 char hardsoft_irq;
449 char need_resched;
450 char irqs_off;
451 int hardirq;
452 int softirq;
453 int nmi;
454
455 nmi = entry->flags & TRACE_FLAG_NMI;
456 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
457 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
458
459 irqs_off =
460 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
461 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
462 '.';
463
464 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
465 TRACE_FLAG_PREEMPT_RESCHED)) {
466 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
467 need_resched = 'N';
468 break;
469 case TRACE_FLAG_NEED_RESCHED:
470 need_resched = 'n';
471 break;
472 case TRACE_FLAG_PREEMPT_RESCHED:
473 need_resched = 'p';
474 break;
475 default:
476 need_resched = '.';
477 break;
478 }
479
480 hardsoft_irq =
481 (nmi && hardirq) ? 'Z' :
482 nmi ? 'z' :
483 (hardirq && softirq) ? 'H' :
484 hardirq ? 'h' :
485 softirq ? 's' :
486 '.' ;
487
488 trace_seq_printf(s, "%c%c%c",
489 irqs_off, need_resched, hardsoft_irq);
490
491 if (entry->preempt_count)
492 trace_seq_printf(s, "%x", entry->preempt_count);
493 else
494 trace_seq_putc(s, '.');
495
496 return !trace_seq_has_overflowed(s);
497 }
498
499 static int
lat_print_generic(struct trace_seq * s,struct trace_entry * entry,int cpu)500 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
501 {
502 char comm[TASK_COMM_LEN];
503
504 trace_find_cmdline(entry->pid, comm);
505
506 trace_seq_printf(s, "%8.8s-%-5d %3d",
507 comm, entry->pid, cpu);
508
509 return trace_print_lat_fmt(s, entry);
510 }
511
512 #undef MARK
513 #define MARK(v, s) {.val = v, .sym = s}
514 /* trace overhead mark */
515 static const struct trace_mark {
516 unsigned long long val; /* unit: nsec */
517 char sym;
518 } mark[] = {
519 MARK(1000000000ULL , '$'), /* 1 sec */
520 MARK(100000000ULL , '@'), /* 100 msec */
521 MARK(10000000ULL , '*'), /* 10 msec */
522 MARK(1000000ULL , '#'), /* 1000 usecs */
523 MARK(100000ULL , '!'), /* 100 usecs */
524 MARK(10000ULL , '+'), /* 10 usecs */
525 };
526 #undef MARK
527
trace_find_mark(unsigned long long d)528 char trace_find_mark(unsigned long long d)
529 {
530 int i;
531 int size = ARRAY_SIZE(mark);
532
533 for (i = 0; i < size; i++) {
534 if (d > mark[i].val)
535 break;
536 }
537
538 return (i == size) ? ' ' : mark[i].sym;
539 }
540
541 static int
lat_print_timestamp(struct trace_iterator * iter,u64 next_ts)542 lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
543 {
544 struct trace_array *tr = iter->tr;
545 unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
546 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
547 unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start;
548 unsigned long long rel_ts = next_ts - iter->ts;
549 struct trace_seq *s = &iter->seq;
550
551 if (in_ns) {
552 abs_ts = ns2usecs(abs_ts);
553 rel_ts = ns2usecs(rel_ts);
554 }
555
556 if (verbose && in_ns) {
557 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
558 unsigned long abs_msec = (unsigned long)abs_ts;
559 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
560 unsigned long rel_msec = (unsigned long)rel_ts;
561
562 trace_seq_printf(
563 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
564 ns2usecs(iter->ts),
565 abs_msec, abs_usec,
566 rel_msec, rel_usec);
567
568 } else if (verbose && !in_ns) {
569 trace_seq_printf(
570 s, "[%016llx] %lld (+%lld): ",
571 iter->ts, abs_ts, rel_ts);
572
573 } else if (!verbose && in_ns) {
574 trace_seq_printf(
575 s, " %4lldus%c: ",
576 abs_ts,
577 trace_find_mark(rel_ts * NSEC_PER_USEC));
578
579 } else { /* !verbose && !in_ns */
580 trace_seq_printf(s, " %4lld: ", abs_ts);
581 }
582
583 return !trace_seq_has_overflowed(s);
584 }
585
trace_print_context(struct trace_iterator * iter)586 int trace_print_context(struct trace_iterator *iter)
587 {
588 struct trace_array *tr = iter->tr;
589 struct trace_seq *s = &iter->seq;
590 struct trace_entry *entry = iter->ent;
591 unsigned long long t;
592 unsigned long secs, usec_rem;
593 char comm[TASK_COMM_LEN];
594
595 trace_find_cmdline(entry->pid, comm);
596
597 trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid);
598
599 if (tr->trace_flags & TRACE_ITER_RECORD_TGID) {
600 unsigned int tgid = trace_find_tgid(entry->pid);
601
602 if (!tgid)
603 trace_seq_printf(s, "(-----) ");
604 else
605 trace_seq_printf(s, "(%5d) ", tgid);
606 }
607
608 trace_seq_printf(s, "[%03d] ", iter->cpu);
609
610 if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
611 trace_print_lat_fmt(s, entry);
612
613 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
614 t = ns2usecs(iter->ts);
615 usec_rem = do_div(t, USEC_PER_SEC);
616 secs = (unsigned long)t;
617 trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
618 } else
619 trace_seq_printf(s, " %12llu: ", iter->ts);
620
621 return !trace_seq_has_overflowed(s);
622 }
623
trace_print_lat_context(struct trace_iterator * iter)624 int trace_print_lat_context(struct trace_iterator *iter)
625 {
626 struct trace_array *tr = iter->tr;
627 /* trace_find_next_entry will reset ent_size */
628 int ent_size = iter->ent_size;
629 struct trace_seq *s = &iter->seq;
630 u64 next_ts;
631 struct trace_entry *entry = iter->ent,
632 *next_entry = trace_find_next_entry(iter, NULL,
633 &next_ts);
634 unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
635
636 /* Restore the original ent_size */
637 iter->ent_size = ent_size;
638
639 if (!next_entry)
640 next_ts = iter->ts;
641
642 if (verbose) {
643 char comm[TASK_COMM_LEN];
644
645 trace_find_cmdline(entry->pid, comm);
646
647 trace_seq_printf(
648 s, "%16s %5d %3d %d %08x %08lx ",
649 comm, entry->pid, iter->cpu, entry->flags,
650 entry->preempt_count, iter->idx);
651 } else {
652 lat_print_generic(s, entry, iter->cpu);
653 }
654
655 lat_print_timestamp(iter, next_ts);
656
657 return !trace_seq_has_overflowed(s);
658 }
659
660 /**
661 * ftrace_find_event - find a registered event
662 * @type: the type of event to look for
663 *
664 * Returns an event of type @type otherwise NULL
665 * Called with trace_event_read_lock() held.
666 */
ftrace_find_event(int type)667 struct trace_event *ftrace_find_event(int type)
668 {
669 struct trace_event *event;
670 unsigned key;
671
672 key = type & (EVENT_HASHSIZE - 1);
673
674 hlist_for_each_entry(event, &event_hash[key], node) {
675 if (event->type == type)
676 return event;
677 }
678
679 return NULL;
680 }
681
682 static LIST_HEAD(ftrace_event_list);
683
trace_search_list(struct list_head ** list)684 static int trace_search_list(struct list_head **list)
685 {
686 struct trace_event *e;
687 int last = __TRACE_LAST_TYPE;
688
689 if (list_empty(&ftrace_event_list)) {
690 *list = &ftrace_event_list;
691 return last + 1;
692 }
693
694 /*
695 * We used up all possible max events,
696 * lets see if somebody freed one.
697 */
698 list_for_each_entry(e, &ftrace_event_list, list) {
699 if (e->type != last + 1)
700 break;
701 last++;
702 }
703
704 /* Did we used up all 65 thousand events??? */
705 if ((last + 1) > TRACE_EVENT_TYPE_MAX)
706 return 0;
707
708 *list = &e->list;
709 return last + 1;
710 }
711
trace_event_read_lock(void)712 void trace_event_read_lock(void)
713 {
714 down_read(&trace_event_sem);
715 }
716
trace_event_read_unlock(void)717 void trace_event_read_unlock(void)
718 {
719 up_read(&trace_event_sem);
720 }
721
722 /**
723 * register_trace_event - register output for an event type
724 * @event: the event type to register
725 *
726 * Event types are stored in a hash and this hash is used to
727 * find a way to print an event. If the @event->type is set
728 * then it will use that type, otherwise it will assign a
729 * type to use.
730 *
731 * If you assign your own type, please make sure it is added
732 * to the trace_type enum in trace.h, to avoid collisions
733 * with the dynamic types.
734 *
735 * Returns the event type number or zero on error.
736 */
register_trace_event(struct trace_event * event)737 int register_trace_event(struct trace_event *event)
738 {
739 unsigned key;
740 int ret = 0;
741
742 down_write(&trace_event_sem);
743
744 if (WARN_ON(!event))
745 goto out;
746
747 if (WARN_ON(!event->funcs))
748 goto out;
749
750 INIT_LIST_HEAD(&event->list);
751
752 if (!event->type) {
753 struct list_head *list = NULL;
754
755 if (next_event_type > TRACE_EVENT_TYPE_MAX) {
756
757 event->type = trace_search_list(&list);
758 if (!event->type)
759 goto out;
760
761 } else {
762
763 event->type = next_event_type++;
764 list = &ftrace_event_list;
765 }
766
767 if (WARN_ON(ftrace_find_event(event->type)))
768 goto out;
769
770 list_add_tail(&event->list, list);
771
772 } else if (event->type > __TRACE_LAST_TYPE) {
773 printk(KERN_WARNING "Need to add type to trace.h\n");
774 WARN_ON(1);
775 goto out;
776 } else {
777 /* Is this event already used */
778 if (ftrace_find_event(event->type))
779 goto out;
780 }
781
782 if (event->funcs->trace == NULL)
783 event->funcs->trace = trace_nop_print;
784 if (event->funcs->raw == NULL)
785 event->funcs->raw = trace_nop_print;
786 if (event->funcs->hex == NULL)
787 event->funcs->hex = trace_nop_print;
788 if (event->funcs->binary == NULL)
789 event->funcs->binary = trace_nop_print;
790
791 key = event->type & (EVENT_HASHSIZE - 1);
792
793 hlist_add_head(&event->node, &event_hash[key]);
794
795 ret = event->type;
796 out:
797 up_write(&trace_event_sem);
798
799 return ret;
800 }
801 EXPORT_SYMBOL_GPL(register_trace_event);
802
803 /*
804 * Used by module code with the trace_event_sem held for write.
805 */
__unregister_trace_event(struct trace_event * event)806 int __unregister_trace_event(struct trace_event *event)
807 {
808 hlist_del(&event->node);
809 list_del(&event->list);
810 return 0;
811 }
812
813 /**
814 * unregister_trace_event - remove a no longer used event
815 * @event: the event to remove
816 */
unregister_trace_event(struct trace_event * event)817 int unregister_trace_event(struct trace_event *event)
818 {
819 down_write(&trace_event_sem);
820 __unregister_trace_event(event);
821 up_write(&trace_event_sem);
822
823 return 0;
824 }
825 EXPORT_SYMBOL_GPL(unregister_trace_event);
826
827 /*
828 * Standard events
829 */
830
trace_nop_print(struct trace_iterator * iter,int flags,struct trace_event * event)831 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
832 struct trace_event *event)
833 {
834 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
835
836 return trace_handle_return(&iter->seq);
837 }
838
839 /* TRACE_FN */
trace_fn_trace(struct trace_iterator * iter,int flags,struct trace_event * event)840 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
841 struct trace_event *event)
842 {
843 struct ftrace_entry *field;
844 struct trace_seq *s = &iter->seq;
845
846 trace_assign_type(field, iter->ent);
847
848 seq_print_ip_sym(s, field->ip, flags);
849
850 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
851 trace_seq_puts(s, " <-");
852 seq_print_ip_sym(s, field->parent_ip, flags);
853 }
854
855 trace_seq_putc(s, '\n');
856
857 return trace_handle_return(s);
858 }
859
trace_fn_raw(struct trace_iterator * iter,int flags,struct trace_event * event)860 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
861 struct trace_event *event)
862 {
863 struct ftrace_entry *field;
864
865 trace_assign_type(field, iter->ent);
866
867 trace_seq_printf(&iter->seq, "%lx %lx\n",
868 field->ip,
869 field->parent_ip);
870
871 return trace_handle_return(&iter->seq);
872 }
873
trace_fn_hex(struct trace_iterator * iter,int flags,struct trace_event * event)874 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
875 struct trace_event *event)
876 {
877 struct ftrace_entry *field;
878 struct trace_seq *s = &iter->seq;
879
880 trace_assign_type(field, iter->ent);
881
882 SEQ_PUT_HEX_FIELD(s, field->ip);
883 SEQ_PUT_HEX_FIELD(s, field->parent_ip);
884
885 return trace_handle_return(s);
886 }
887
trace_fn_bin(struct trace_iterator * iter,int flags,struct trace_event * event)888 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
889 struct trace_event *event)
890 {
891 struct ftrace_entry *field;
892 struct trace_seq *s = &iter->seq;
893
894 trace_assign_type(field, iter->ent);
895
896 SEQ_PUT_FIELD(s, field->ip);
897 SEQ_PUT_FIELD(s, field->parent_ip);
898
899 return trace_handle_return(s);
900 }
901
902 static struct trace_event_functions trace_fn_funcs = {
903 .trace = trace_fn_trace,
904 .raw = trace_fn_raw,
905 .hex = trace_fn_hex,
906 .binary = trace_fn_bin,
907 };
908
909 static struct trace_event trace_fn_event = {
910 .type = TRACE_FN,
911 .funcs = &trace_fn_funcs,
912 };
913
914 /* TRACE_GRAPH_ENT */
trace_graph_ent_trace(struct trace_iterator * iter,int flags,struct trace_event * event)915 static enum print_line_t trace_graph_ent_trace(struct trace_iterator *iter, int flags,
916 struct trace_event *event)
917 {
918 struct trace_seq *s = &iter->seq;
919 struct ftrace_graph_ent_entry *field;
920
921 trace_assign_type(field, iter->ent);
922
923 trace_seq_puts(s, "graph_ent: func=");
924 if (trace_seq_has_overflowed(s))
925 return TRACE_TYPE_PARTIAL_LINE;
926
927 if (!seq_print_ip_sym(s, field->graph_ent.func, flags))
928 return TRACE_TYPE_PARTIAL_LINE;
929
930 trace_seq_puts(s, "\n");
931 if (trace_seq_has_overflowed(s))
932 return TRACE_TYPE_PARTIAL_LINE;
933
934 return TRACE_TYPE_HANDLED;
935 }
936
trace_graph_ent_raw(struct trace_iterator * iter,int flags,struct trace_event * event)937 static enum print_line_t trace_graph_ent_raw(struct trace_iterator *iter, int flags,
938 struct trace_event *event)
939 {
940 struct ftrace_graph_ent_entry *field;
941
942 trace_assign_type(field, iter->ent);
943
944 trace_seq_printf(&iter->seq, "%lx %d\n",
945 field->graph_ent.func,
946 field->graph_ent.depth);
947 if (trace_seq_has_overflowed(&iter->seq))
948 return TRACE_TYPE_PARTIAL_LINE;
949
950 return TRACE_TYPE_HANDLED;
951 }
952
trace_graph_ent_hex(struct trace_iterator * iter,int flags,struct trace_event * event)953 static enum print_line_t trace_graph_ent_hex(struct trace_iterator *iter, int flags,
954 struct trace_event *event)
955 {
956 struct ftrace_graph_ent_entry *field;
957 struct trace_seq *s = &iter->seq;
958
959 trace_assign_type(field, iter->ent);
960
961 SEQ_PUT_HEX_FIELD(s, field->graph_ent.func);
962 SEQ_PUT_HEX_FIELD(s, field->graph_ent.depth);
963
964 return TRACE_TYPE_HANDLED;
965 }
966
trace_graph_ent_bin(struct trace_iterator * iter,int flags,struct trace_event * event)967 static enum print_line_t trace_graph_ent_bin(struct trace_iterator *iter, int flags,
968 struct trace_event *event)
969 {
970 struct ftrace_graph_ent_entry *field;
971 struct trace_seq *s = &iter->seq;
972
973 trace_assign_type(field, iter->ent);
974
975 SEQ_PUT_FIELD(s, field->graph_ent.func);
976 SEQ_PUT_FIELD(s, field->graph_ent.depth);
977
978 return TRACE_TYPE_HANDLED;
979 }
980
981 static struct trace_event_functions trace_graph_ent_funcs = {
982 .trace = trace_graph_ent_trace,
983 .raw = trace_graph_ent_raw,
984 .hex = trace_graph_ent_hex,
985 .binary = trace_graph_ent_bin,
986 };
987
988 static struct trace_event trace_graph_ent_event = {
989 .type = TRACE_GRAPH_ENT,
990 .funcs = &trace_graph_ent_funcs,
991 };
992
993 /* TRACE_GRAPH_RET */
trace_graph_ret_trace(struct trace_iterator * iter,int flags,struct trace_event * event)994 static enum print_line_t trace_graph_ret_trace(struct trace_iterator *iter, int flags,
995 struct trace_event *event)
996 {
997 struct trace_seq *s = &iter->seq;
998 struct trace_entry *entry = iter->ent;
999 struct ftrace_graph_ret_entry *field;
1000
1001 trace_assign_type(field, entry);
1002
1003 trace_seq_puts(s, "graph_ret: func=");
1004 if (trace_seq_has_overflowed(s))
1005 return TRACE_TYPE_PARTIAL_LINE;
1006
1007 if (!seq_print_ip_sym(s, field->ret.func, flags))
1008 return TRACE_TYPE_PARTIAL_LINE;
1009
1010 trace_seq_puts(s, "\n");
1011 if (trace_seq_has_overflowed(s))
1012 return TRACE_TYPE_PARTIAL_LINE;
1013
1014 return TRACE_TYPE_HANDLED;
1015 }
1016
trace_graph_ret_raw(struct trace_iterator * iter,int flags,struct trace_event * event)1017 static enum print_line_t trace_graph_ret_raw(struct trace_iterator *iter, int flags,
1018 struct trace_event *event)
1019 {
1020 struct ftrace_graph_ret_entry *field;
1021
1022 trace_assign_type(field, iter->ent);
1023
1024 trace_seq_printf(&iter->seq, "%lx %lld %lld %ld %d\n",
1025 field->ret.func,
1026 field->ret.calltime,
1027 field->ret.rettime,
1028 field->ret.overrun,
1029 field->ret.depth);
1030 if (trace_seq_has_overflowed(&iter->seq))
1031 return TRACE_TYPE_PARTIAL_LINE;
1032
1033 return TRACE_TYPE_HANDLED;
1034 }
1035
trace_graph_ret_hex(struct trace_iterator * iter,int flags,struct trace_event * event)1036 static enum print_line_t trace_graph_ret_hex(struct trace_iterator *iter, int flags,
1037 struct trace_event *event)
1038 {
1039 struct ftrace_graph_ret_entry *field;
1040 struct trace_seq *s = &iter->seq;
1041
1042 trace_assign_type(field, iter->ent);
1043
1044 SEQ_PUT_HEX_FIELD(s, field->ret.func);
1045 SEQ_PUT_HEX_FIELD(s, field->ret.calltime);
1046 SEQ_PUT_HEX_FIELD(s, field->ret.rettime);
1047 SEQ_PUT_HEX_FIELD(s, field->ret.overrun);
1048 SEQ_PUT_HEX_FIELD(s, field->ret.depth);
1049
1050 return TRACE_TYPE_HANDLED;
1051 }
1052
trace_graph_ret_bin(struct trace_iterator * iter,int flags,struct trace_event * event)1053 static enum print_line_t trace_graph_ret_bin(struct trace_iterator *iter, int flags,
1054 struct trace_event *event)
1055 {
1056 struct ftrace_graph_ret_entry *field;
1057 struct trace_seq *s = &iter->seq;
1058
1059 trace_assign_type(field, iter->ent);
1060
1061 SEQ_PUT_FIELD(s, field->ret.func);
1062 SEQ_PUT_FIELD(s, field->ret.calltime);
1063 SEQ_PUT_FIELD(s, field->ret.rettime);
1064 SEQ_PUT_FIELD(s, field->ret.overrun);
1065 SEQ_PUT_FIELD(s, field->ret.depth);
1066
1067 return TRACE_TYPE_HANDLED;
1068 }
1069
1070 static struct trace_event_functions trace_graph_ret_funcs = {
1071 .trace = trace_graph_ret_trace,
1072 .raw = trace_graph_ret_raw,
1073 .hex = trace_graph_ret_hex,
1074 .binary = trace_graph_ret_bin,
1075 };
1076
1077 static struct trace_event trace_graph_ret_event = {
1078 .type = TRACE_GRAPH_RET,
1079 .funcs = &trace_graph_ret_funcs,
1080 };
1081
1082 /* TRACE_CTX an TRACE_WAKE */
trace_ctxwake_print(struct trace_iterator * iter,char * delim)1083 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
1084 char *delim)
1085 {
1086 struct ctx_switch_entry *field;
1087 char comm[TASK_COMM_LEN];
1088 int S, T;
1089
1090
1091 trace_assign_type(field, iter->ent);
1092
1093 T = __task_state_to_char(field->next_state);
1094 S = __task_state_to_char(field->prev_state);
1095 trace_find_cmdline(field->next_pid, comm);
1096 trace_seq_printf(&iter->seq,
1097 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
1098 field->prev_pid,
1099 field->prev_prio,
1100 S, delim,
1101 field->next_cpu,
1102 field->next_pid,
1103 field->next_prio,
1104 T, comm);
1105
1106 return trace_handle_return(&iter->seq);
1107 }
1108
trace_ctx_print(struct trace_iterator * iter,int flags,struct trace_event * event)1109 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
1110 struct trace_event *event)
1111 {
1112 return trace_ctxwake_print(iter, "==>");
1113 }
1114
trace_wake_print(struct trace_iterator * iter,int flags,struct trace_event * event)1115 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
1116 int flags, struct trace_event *event)
1117 {
1118 return trace_ctxwake_print(iter, " +");
1119 }
1120
trace_ctxwake_raw(struct trace_iterator * iter,char S)1121 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
1122 {
1123 struct ctx_switch_entry *field;
1124 int T;
1125
1126 trace_assign_type(field, iter->ent);
1127
1128 if (!S)
1129 S = __task_state_to_char(field->prev_state);
1130 T = __task_state_to_char(field->next_state);
1131 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
1132 field->prev_pid,
1133 field->prev_prio,
1134 S,
1135 field->next_cpu,
1136 field->next_pid,
1137 field->next_prio,
1138 T);
1139
1140 return trace_handle_return(&iter->seq);
1141 }
1142
trace_ctx_raw(struct trace_iterator * iter,int flags,struct trace_event * event)1143 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
1144 struct trace_event *event)
1145 {
1146 return trace_ctxwake_raw(iter, 0);
1147 }
1148
trace_wake_raw(struct trace_iterator * iter,int flags,struct trace_event * event)1149 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
1150 struct trace_event *event)
1151 {
1152 return trace_ctxwake_raw(iter, '+');
1153 }
1154
1155
trace_ctxwake_hex(struct trace_iterator * iter,char S)1156 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
1157 {
1158 struct ctx_switch_entry *field;
1159 struct trace_seq *s = &iter->seq;
1160 int T;
1161
1162 trace_assign_type(field, iter->ent);
1163
1164 if (!S)
1165 S = __task_state_to_char(field->prev_state);
1166 T = __task_state_to_char(field->next_state);
1167
1168 SEQ_PUT_HEX_FIELD(s, field->prev_pid);
1169 SEQ_PUT_HEX_FIELD(s, field->prev_prio);
1170 SEQ_PUT_HEX_FIELD(s, S);
1171 SEQ_PUT_HEX_FIELD(s, field->next_cpu);
1172 SEQ_PUT_HEX_FIELD(s, field->next_pid);
1173 SEQ_PUT_HEX_FIELD(s, field->next_prio);
1174 SEQ_PUT_HEX_FIELD(s, T);
1175
1176 return trace_handle_return(s);
1177 }
1178
trace_ctx_hex(struct trace_iterator * iter,int flags,struct trace_event * event)1179 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1180 struct trace_event *event)
1181 {
1182 return trace_ctxwake_hex(iter, 0);
1183 }
1184
trace_wake_hex(struct trace_iterator * iter,int flags,struct trace_event * event)1185 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1186 struct trace_event *event)
1187 {
1188 return trace_ctxwake_hex(iter, '+');
1189 }
1190
trace_ctxwake_bin(struct trace_iterator * iter,int flags,struct trace_event * event)1191 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1192 int flags, struct trace_event *event)
1193 {
1194 struct ctx_switch_entry *field;
1195 struct trace_seq *s = &iter->seq;
1196
1197 trace_assign_type(field, iter->ent);
1198
1199 SEQ_PUT_FIELD(s, field->prev_pid);
1200 SEQ_PUT_FIELD(s, field->prev_prio);
1201 SEQ_PUT_FIELD(s, field->prev_state);
1202 SEQ_PUT_FIELD(s, field->next_cpu);
1203 SEQ_PUT_FIELD(s, field->next_pid);
1204 SEQ_PUT_FIELD(s, field->next_prio);
1205 SEQ_PUT_FIELD(s, field->next_state);
1206
1207 return trace_handle_return(s);
1208 }
1209
1210 static struct trace_event_functions trace_ctx_funcs = {
1211 .trace = trace_ctx_print,
1212 .raw = trace_ctx_raw,
1213 .hex = trace_ctx_hex,
1214 .binary = trace_ctxwake_bin,
1215 };
1216
1217 static struct trace_event trace_ctx_event = {
1218 .type = TRACE_CTX,
1219 .funcs = &trace_ctx_funcs,
1220 };
1221
1222 static struct trace_event_functions trace_wake_funcs = {
1223 .trace = trace_wake_print,
1224 .raw = trace_wake_raw,
1225 .hex = trace_wake_hex,
1226 .binary = trace_ctxwake_bin,
1227 };
1228
1229 static struct trace_event trace_wake_event = {
1230 .type = TRACE_WAKE,
1231 .funcs = &trace_wake_funcs,
1232 };
1233
1234 /* TRACE_STACK */
1235
trace_stack_print(struct trace_iterator * iter,int flags,struct trace_event * event)1236 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1237 int flags, struct trace_event *event)
1238 {
1239 struct stack_entry *field;
1240 struct trace_seq *s = &iter->seq;
1241 unsigned long *p;
1242 unsigned long *end;
1243
1244 trace_assign_type(field, iter->ent);
1245 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1246
1247 trace_seq_puts(s, "<stack trace>\n");
1248
1249 for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1250
1251 if (trace_seq_has_overflowed(s))
1252 break;
1253
1254 trace_seq_puts(s, " => ");
1255 seq_print_ip_sym(s, *p, flags);
1256 trace_seq_putc(s, '\n');
1257 }
1258
1259 return trace_handle_return(s);
1260 }
1261
1262 static struct trace_event_functions trace_stack_funcs = {
1263 .trace = trace_stack_print,
1264 };
1265
1266 static struct trace_event trace_stack_event = {
1267 .type = TRACE_STACK,
1268 .funcs = &trace_stack_funcs,
1269 };
1270
1271 /* TRACE_USER_STACK */
trace_user_stack_print(struct trace_iterator * iter,int flags,struct trace_event * event)1272 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1273 int flags, struct trace_event *event)
1274 {
1275 struct trace_array *tr = iter->tr;
1276 struct userstack_entry *field;
1277 struct trace_seq *s = &iter->seq;
1278 struct mm_struct *mm = NULL;
1279 unsigned int i;
1280
1281 trace_assign_type(field, iter->ent);
1282
1283 trace_seq_puts(s, "<user stack trace>\n");
1284
1285 if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
1286 struct task_struct *task;
1287 /*
1288 * we do the lookup on the thread group leader,
1289 * since individual threads might have already quit!
1290 */
1291 rcu_read_lock();
1292 task = find_task_by_vpid(field->tgid);
1293 if (task)
1294 mm = get_task_mm(task);
1295 rcu_read_unlock();
1296 }
1297
1298 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1299 unsigned long ip = field->caller[i];
1300
1301 if (ip == ULONG_MAX || trace_seq_has_overflowed(s))
1302 break;
1303
1304 trace_seq_puts(s, " => ");
1305
1306 if (!ip) {
1307 trace_seq_puts(s, "??");
1308 trace_seq_putc(s, '\n');
1309 continue;
1310 }
1311
1312 seq_print_user_ip(s, mm, ip, flags);
1313 trace_seq_putc(s, '\n');
1314 }
1315
1316 if (mm)
1317 mmput(mm);
1318
1319 return trace_handle_return(s);
1320 }
1321
1322 static struct trace_event_functions trace_user_stack_funcs = {
1323 .trace = trace_user_stack_print,
1324 };
1325
1326 static struct trace_event trace_user_stack_event = {
1327 .type = TRACE_USER_STACK,
1328 .funcs = &trace_user_stack_funcs,
1329 };
1330
1331 /* TRACE_HWLAT */
1332 static enum print_line_t
trace_hwlat_print(struct trace_iterator * iter,int flags,struct trace_event * event)1333 trace_hwlat_print(struct trace_iterator *iter, int flags,
1334 struct trace_event *event)
1335 {
1336 struct trace_entry *entry = iter->ent;
1337 struct trace_seq *s = &iter->seq;
1338 struct hwlat_entry *field;
1339
1340 trace_assign_type(field, entry);
1341
1342 trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld",
1343 field->seqnum,
1344 field->duration,
1345 field->outer_duration,
1346 (long long)field->timestamp.tv_sec,
1347 field->timestamp.tv_nsec);
1348
1349 if (field->nmi_count) {
1350 /*
1351 * The generic sched_clock() is not NMI safe, thus
1352 * we only record the count and not the time.
1353 */
1354 if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK))
1355 trace_seq_printf(s, " nmi-total:%llu",
1356 field->nmi_total_ts);
1357 trace_seq_printf(s, " nmi-count:%u",
1358 field->nmi_count);
1359 }
1360
1361 trace_seq_putc(s, '\n');
1362
1363 return trace_handle_return(s);
1364 }
1365
1366
1367 static enum print_line_t
trace_hwlat_raw(struct trace_iterator * iter,int flags,struct trace_event * event)1368 trace_hwlat_raw(struct trace_iterator *iter, int flags,
1369 struct trace_event *event)
1370 {
1371 struct hwlat_entry *field;
1372 struct trace_seq *s = &iter->seq;
1373
1374 trace_assign_type(field, iter->ent);
1375
1376 trace_seq_printf(s, "%llu %lld %lld %09ld %u\n",
1377 field->duration,
1378 field->outer_duration,
1379 (long long)field->timestamp.tv_sec,
1380 field->timestamp.tv_nsec,
1381 field->seqnum);
1382
1383 return trace_handle_return(s);
1384 }
1385
1386 static struct trace_event_functions trace_hwlat_funcs = {
1387 .trace = trace_hwlat_print,
1388 .raw = trace_hwlat_raw,
1389 };
1390
1391 static struct trace_event trace_hwlat_event = {
1392 .type = TRACE_HWLAT,
1393 .funcs = &trace_hwlat_funcs,
1394 };
1395
1396 /* TRACE_BPUTS */
1397 static enum print_line_t
trace_bputs_print(struct trace_iterator * iter,int flags,struct trace_event * event)1398 trace_bputs_print(struct trace_iterator *iter, int flags,
1399 struct trace_event *event)
1400 {
1401 struct trace_entry *entry = iter->ent;
1402 struct trace_seq *s = &iter->seq;
1403 struct bputs_entry *field;
1404
1405 trace_assign_type(field, entry);
1406
1407 seq_print_ip_sym(s, field->ip, flags);
1408 trace_seq_puts(s, ": ");
1409 trace_seq_puts(s, field->str);
1410
1411 return trace_handle_return(s);
1412 }
1413
1414
1415 static enum print_line_t
trace_bputs_raw(struct trace_iterator * iter,int flags,struct trace_event * event)1416 trace_bputs_raw(struct trace_iterator *iter, int flags,
1417 struct trace_event *event)
1418 {
1419 struct bputs_entry *field;
1420 struct trace_seq *s = &iter->seq;
1421
1422 trace_assign_type(field, iter->ent);
1423
1424 trace_seq_printf(s, ": %lx : ", field->ip);
1425 trace_seq_puts(s, field->str);
1426
1427 return trace_handle_return(s);
1428 }
1429
1430 static struct trace_event_functions trace_bputs_funcs = {
1431 .trace = trace_bputs_print,
1432 .raw = trace_bputs_raw,
1433 };
1434
1435 static struct trace_event trace_bputs_event = {
1436 .type = TRACE_BPUTS,
1437 .funcs = &trace_bputs_funcs,
1438 };
1439
1440 /* TRACE_BPRINT */
1441 static enum print_line_t
trace_bprint_print(struct trace_iterator * iter,int flags,struct trace_event * event)1442 trace_bprint_print(struct trace_iterator *iter, int flags,
1443 struct trace_event *event)
1444 {
1445 struct trace_entry *entry = iter->ent;
1446 struct trace_seq *s = &iter->seq;
1447 struct bprint_entry *field;
1448
1449 trace_assign_type(field, entry);
1450
1451 seq_print_ip_sym(s, field->ip, flags);
1452 trace_seq_puts(s, ": ");
1453 trace_seq_bprintf(s, field->fmt, field->buf);
1454
1455 return trace_handle_return(s);
1456 }
1457
1458
1459 static enum print_line_t
trace_bprint_raw(struct trace_iterator * iter,int flags,struct trace_event * event)1460 trace_bprint_raw(struct trace_iterator *iter, int flags,
1461 struct trace_event *event)
1462 {
1463 struct bprint_entry *field;
1464 struct trace_seq *s = &iter->seq;
1465
1466 trace_assign_type(field, iter->ent);
1467
1468 trace_seq_printf(s, ": %lx : ", field->ip);
1469 trace_seq_bprintf(s, field->fmt, field->buf);
1470
1471 return trace_handle_return(s);
1472 }
1473
1474 static struct trace_event_functions trace_bprint_funcs = {
1475 .trace = trace_bprint_print,
1476 .raw = trace_bprint_raw,
1477 };
1478
1479 static struct trace_event trace_bprint_event = {
1480 .type = TRACE_BPRINT,
1481 .funcs = &trace_bprint_funcs,
1482 };
1483
1484 /* TRACE_PRINT */
trace_print_print(struct trace_iterator * iter,int flags,struct trace_event * event)1485 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1486 int flags, struct trace_event *event)
1487 {
1488 struct print_entry *field;
1489 struct trace_seq *s = &iter->seq;
1490
1491 trace_assign_type(field, iter->ent);
1492
1493 seq_print_ip_sym(s, field->ip, flags);
1494 trace_seq_printf(s, ": %s", field->buf);
1495
1496 return trace_handle_return(s);
1497 }
1498
trace_print_raw(struct trace_iterator * iter,int flags,struct trace_event * event)1499 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1500 struct trace_event *event)
1501 {
1502 struct print_entry *field;
1503
1504 trace_assign_type(field, iter->ent);
1505
1506 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1507
1508 return trace_handle_return(&iter->seq);
1509 }
1510
1511 static struct trace_event_functions trace_print_funcs = {
1512 .trace = trace_print_print,
1513 .raw = trace_print_raw,
1514 };
1515
1516 static struct trace_event trace_print_event = {
1517 .type = TRACE_PRINT,
1518 .funcs = &trace_print_funcs,
1519 };
1520
trace_raw_data(struct trace_iterator * iter,int flags,struct trace_event * event)1521 static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags,
1522 struct trace_event *event)
1523 {
1524 struct raw_data_entry *field;
1525 int i;
1526
1527 trace_assign_type(field, iter->ent);
1528
1529 trace_seq_printf(&iter->seq, "# %x buf:", field->id);
1530
1531 for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++)
1532 trace_seq_printf(&iter->seq, " %02x",
1533 (unsigned char)field->buf[i]);
1534
1535 trace_seq_putc(&iter->seq, '\n');
1536
1537 return trace_handle_return(&iter->seq);
1538 }
1539
1540 static struct trace_event_functions trace_raw_data_funcs = {
1541 .trace = trace_raw_data,
1542 .raw = trace_raw_data,
1543 };
1544
1545 static struct trace_event trace_raw_data_event = {
1546 .type = TRACE_RAW_DATA,
1547 .funcs = &trace_raw_data_funcs,
1548 };
1549
1550
1551 static struct trace_event *events[] __initdata = {
1552 &trace_fn_event,
1553 &trace_graph_ent_event,
1554 &trace_graph_ret_event,
1555 &trace_ctx_event,
1556 &trace_wake_event,
1557 &trace_stack_event,
1558 &trace_user_stack_event,
1559 &trace_bputs_event,
1560 &trace_bprint_event,
1561 &trace_print_event,
1562 &trace_hwlat_event,
1563 &trace_raw_data_event,
1564 NULL
1565 };
1566
init_events(void)1567 __init static int init_events(void)
1568 {
1569 struct trace_event *event;
1570 int i, ret;
1571
1572 for (i = 0; events[i]; i++) {
1573 event = events[i];
1574
1575 ret = register_trace_event(event);
1576 if (!ret) {
1577 printk(KERN_WARNING "event %d failed to register\n",
1578 event->type);
1579 WARN_ON_ONCE(1);
1580 }
1581 }
1582
1583 return 0;
1584 }
1585 early_initcall(init_events);
1586