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
17 DECLARE_RWSEM(trace_event_sem);
18
19 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
20
21 static int next_event_type = __TRACE_LAST_TYPE + 1;
22
trace_print_bputs_msg_only(struct trace_iterator * iter)23 enum 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
trace_print_bprintk_msg_only(struct trace_iterator * iter)36 enum 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
trace_print_printk_msg_only(struct trace_iterator * iter)49 enum 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
62 const char *
trace_print_flags_seq(struct trace_seq * p,const char * delim,unsigned long flags,const struct trace_print_flags * flag_array)63 trace_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 }
98 EXPORT_SYMBOL(trace_print_flags_seq);
99
100 const char *
trace_print_symbols_seq(struct trace_seq * p,unsigned long val,const struct trace_print_flags * symbol_array)101 trace_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 }
123 EXPORT_SYMBOL(trace_print_symbols_seq);
124
125 #if BITS_PER_LONG == 32
126 const char *
trace_print_symbols_seq_u64(struct trace_seq * p,unsigned long long val,const struct trace_print_flags_u64 * symbol_array)127 trace_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 }
149 EXPORT_SYMBOL(trace_print_symbols_seq_u64);
150 #endif
151
152 const char *
trace_print_bitmask_seq(struct trace_seq * p,void * bitmask_ptr,unsigned int bitmask_size)153 trace_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 }
163 EXPORT_SYMBOL_GPL(trace_print_bitmask_seq);
164
165 const char *
trace_print_hex_seq(struct trace_seq * p,const unsigned char * buf,int buf_len)166 trace_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 }
178 EXPORT_SYMBOL(trace_print_hex_seq);
179
180 const char *
trace_print_array_seq(struct trace_seq * p,const void * buf,int count,size_t el_size)181 trace_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 }
223 EXPORT_SYMBOL(trace_print_array_seq);
224
trace_raw_output_prep(struct trace_iterator * iter,struct trace_event * trace_event)225 int 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 }
246 EXPORT_SYMBOL(trace_raw_output_prep);
247
trace_output_raw(struct trace_iterator * iter,char * name,char * fmt,va_list ap)248 static 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
trace_output_call(struct trace_iterator * iter,char * name,char * fmt,...)259 int 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 }
270 EXPORT_SYMBOL_GPL(trace_output_call);
271
272 #ifdef CONFIG_KRETPROBES
kretprobed(const char * name)273 static 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
kretprobed(const char * name)283 static inline const char *kretprobed(const char *name)
284 {
285 return name;
286 }
287 #endif /* CONFIG_KRETPROBES */
288
289 static void
seq_print_sym_short(struct trace_seq * s,const char * fmt,unsigned long address)290 seq_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
304 static void
seq_print_sym_offset(struct trace_seq * s,const char * fmt,unsigned long address)305 seq_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
seq_print_user_ip(struct trace_seq * s,struct mm_struct * mm,unsigned long ip,unsigned long sym_flags)325 static 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
357 int
seq_print_ip_sym(struct trace_seq * s,unsigned long ip,unsigned long sym_flags)358 seq_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 */
trace_print_lat_fmt(struct trace_seq * s,struct trace_entry * entry)385 int 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
393 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
394 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
395
396 irqs_off =
397 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
398 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
399 '.';
400
401 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
402 TRACE_FLAG_PREEMPT_RESCHED)) {
403 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
404 need_resched = 'N';
405 break;
406 case TRACE_FLAG_NEED_RESCHED:
407 need_resched = 'n';
408 break;
409 case TRACE_FLAG_PREEMPT_RESCHED:
410 need_resched = 'p';
411 break;
412 default:
413 need_resched = '.';
414 break;
415 }
416
417 hardsoft_irq =
418 (hardirq && softirq) ? 'H' :
419 hardirq ? 'h' :
420 softirq ? 's' :
421 '.';
422
423 trace_seq_printf(s, "%c%c%c",
424 irqs_off, need_resched, hardsoft_irq);
425
426 if (entry->preempt_count)
427 trace_seq_printf(s, "%x", entry->preempt_count);
428 else
429 trace_seq_putc(s, '.');
430
431 return !trace_seq_has_overflowed(s);
432 }
433
434 static int
lat_print_generic(struct trace_seq * s,struct trace_entry * entry,int cpu)435 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
436 {
437 char comm[TASK_COMM_LEN];
438
439 trace_find_cmdline(entry->pid, comm);
440
441 trace_seq_printf(s, "%8.8s-%-5d %3d",
442 comm, entry->pid, cpu);
443
444 return trace_print_lat_fmt(s, entry);
445 }
446
447 #undef MARK
448 #define MARK(v, s) {.val = v, .sym = s}
449 /* trace overhead mark */
450 static const struct trace_mark {
451 unsigned long long val; /* unit: nsec */
452 char sym;
453 } mark[] = {
454 MARK(1000000000ULL , '$'), /* 1 sec */
455 MARK(100000000ULL , '@'), /* 100 msec */
456 MARK(10000000ULL , '*'), /* 10 msec */
457 MARK(1000000ULL , '#'), /* 1000 usecs */
458 MARK(100000ULL , '!'), /* 100 usecs */
459 MARK(10000ULL , '+'), /* 10 usecs */
460 };
461 #undef MARK
462
trace_find_mark(unsigned long long d)463 char trace_find_mark(unsigned long long d)
464 {
465 int i;
466 int size = ARRAY_SIZE(mark);
467
468 for (i = 0; i < size; i++) {
469 if (d > mark[i].val)
470 break;
471 }
472
473 return (i == size) ? ' ' : mark[i].sym;
474 }
475
476 static int
lat_print_timestamp(struct trace_iterator * iter,u64 next_ts)477 lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
478 {
479 struct trace_array *tr = iter->tr;
480 unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
481 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
482 unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start;
483 unsigned long long rel_ts = next_ts - iter->ts;
484 struct trace_seq *s = &iter->seq;
485
486 if (in_ns) {
487 abs_ts = ns2usecs(abs_ts);
488 rel_ts = ns2usecs(rel_ts);
489 }
490
491 if (verbose && in_ns) {
492 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
493 unsigned long abs_msec = (unsigned long)abs_ts;
494 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
495 unsigned long rel_msec = (unsigned long)rel_ts;
496
497 trace_seq_printf(
498 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
499 ns2usecs(iter->ts),
500 abs_msec, abs_usec,
501 rel_msec, rel_usec);
502
503 } else if (verbose && !in_ns) {
504 trace_seq_printf(
505 s, "[%016llx] %lld (+%lld): ",
506 iter->ts, abs_ts, rel_ts);
507
508 } else if (!verbose && in_ns) {
509 trace_seq_printf(
510 s, " %4lldus%c: ",
511 abs_ts,
512 trace_find_mark(rel_ts * NSEC_PER_USEC));
513
514 } else { /* !verbose && !in_ns */
515 trace_seq_printf(s, " %4lld: ", abs_ts);
516 }
517
518 return !trace_seq_has_overflowed(s);
519 }
520
trace_print_context(struct trace_iterator * iter)521 int trace_print_context(struct trace_iterator *iter)
522 {
523 struct trace_array *tr = iter->tr;
524 struct trace_seq *s = &iter->seq;
525 struct trace_entry *entry = iter->ent;
526 unsigned long long t;
527 unsigned long secs, usec_rem;
528 char comm[TASK_COMM_LEN];
529 int tgid;
530
531 trace_find_cmdline(entry->pid, comm);
532
533 trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid);
534
535 if (tr->trace_flags & TRACE_ITER_TGID) {
536 tgid = trace_find_tgid(entry->pid);
537 if (tgid < 0)
538 trace_seq_puts(s, "(-----) ");
539 else
540 trace_seq_printf(s, "(%5d) ", tgid);
541 }
542
543 trace_seq_printf(s, "[%03d] ", iter->cpu);
544
545 if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
546 trace_print_lat_fmt(s, entry);
547
548 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
549 t = ns2usecs(iter->ts);
550 usec_rem = do_div(t, USEC_PER_SEC);
551 secs = (unsigned long)t;
552 trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
553 } else
554 trace_seq_printf(s, " %12llu: ", iter->ts);
555
556 return !trace_seq_has_overflowed(s);
557 }
558
trace_print_lat_context(struct trace_iterator * iter)559 int trace_print_lat_context(struct trace_iterator *iter)
560 {
561 struct trace_array *tr = iter->tr;
562 /* trace_find_next_entry will reset ent_size */
563 int ent_size = iter->ent_size;
564 struct trace_seq *s = &iter->seq;
565 u64 next_ts;
566 struct trace_entry *entry = iter->ent,
567 *next_entry = trace_find_next_entry(iter, NULL,
568 &next_ts);
569 unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
570
571 /* Restore the original ent_size */
572 iter->ent_size = ent_size;
573
574 if (!next_entry)
575 next_ts = iter->ts;
576
577 if (verbose) {
578 char comm[TASK_COMM_LEN];
579
580 trace_find_cmdline(entry->pid, comm);
581
582 trace_seq_printf(
583 s, "%16s %5d %3d %d %08x %08lx ",
584 comm, entry->pid, iter->cpu, entry->flags,
585 entry->preempt_count, iter->idx);
586 } else {
587 lat_print_generic(s, entry, iter->cpu);
588 }
589
590 lat_print_timestamp(iter, next_ts);
591
592 return !trace_seq_has_overflowed(s);
593 }
594
595 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
596
task_state_char(unsigned long state)597 static int task_state_char(unsigned long state)
598 {
599 int bit = state ? __ffs(state) + 1 : 0;
600
601 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
602 }
603
604 /**
605 * ftrace_find_event - find a registered event
606 * @type: the type of event to look for
607 *
608 * Returns an event of type @type otherwise NULL
609 * Called with trace_event_read_lock() held.
610 */
ftrace_find_event(int type)611 struct trace_event *ftrace_find_event(int type)
612 {
613 struct trace_event *event;
614 unsigned key;
615
616 key = type & (EVENT_HASHSIZE - 1);
617
618 hlist_for_each_entry(event, &event_hash[key], node) {
619 if (event->type == type)
620 return event;
621 }
622
623 return NULL;
624 }
625
626 static LIST_HEAD(ftrace_event_list);
627
trace_search_list(struct list_head ** list)628 static int trace_search_list(struct list_head **list)
629 {
630 struct trace_event *e;
631 int last = __TRACE_LAST_TYPE;
632
633 if (list_empty(&ftrace_event_list)) {
634 *list = &ftrace_event_list;
635 return last + 1;
636 }
637
638 /*
639 * We used up all possible max events,
640 * lets see if somebody freed one.
641 */
642 list_for_each_entry(e, &ftrace_event_list, list) {
643 if (e->type != last + 1)
644 break;
645 last++;
646 }
647
648 /* Did we used up all 65 thousand events??? */
649 if ((last + 1) > TRACE_EVENT_TYPE_MAX)
650 return 0;
651
652 *list = &e->list;
653 return last + 1;
654 }
655
trace_event_read_lock(void)656 void trace_event_read_lock(void)
657 {
658 down_read(&trace_event_sem);
659 }
660
trace_event_read_unlock(void)661 void trace_event_read_unlock(void)
662 {
663 up_read(&trace_event_sem);
664 }
665
666 /**
667 * register_trace_event - register output for an event type
668 * @event: the event type to register
669 *
670 * Event types are stored in a hash and this hash is used to
671 * find a way to print an event. If the @event->type is set
672 * then it will use that type, otherwise it will assign a
673 * type to use.
674 *
675 * If you assign your own type, please make sure it is added
676 * to the trace_type enum in trace.h, to avoid collisions
677 * with the dynamic types.
678 *
679 * Returns the event type number or zero on error.
680 */
register_trace_event(struct trace_event * event)681 int register_trace_event(struct trace_event *event)
682 {
683 unsigned key;
684 int ret = 0;
685
686 down_write(&trace_event_sem);
687
688 if (WARN_ON(!event))
689 goto out;
690
691 if (WARN_ON(!event->funcs))
692 goto out;
693
694 INIT_LIST_HEAD(&event->list);
695
696 if (!event->type) {
697 struct list_head *list = NULL;
698
699 if (next_event_type > TRACE_EVENT_TYPE_MAX) {
700
701 event->type = trace_search_list(&list);
702 if (!event->type)
703 goto out;
704
705 } else {
706
707 event->type = next_event_type++;
708 list = &ftrace_event_list;
709 }
710
711 if (WARN_ON(ftrace_find_event(event->type)))
712 goto out;
713
714 list_add_tail(&event->list, list);
715
716 } else if (event->type > __TRACE_LAST_TYPE) {
717 printk(KERN_WARNING "Need to add type to trace.h\n");
718 WARN_ON(1);
719 goto out;
720 } else {
721 /* Is this event already used */
722 if (ftrace_find_event(event->type))
723 goto out;
724 }
725
726 if (event->funcs->trace == NULL)
727 event->funcs->trace = trace_nop_print;
728 if (event->funcs->raw == NULL)
729 event->funcs->raw = trace_nop_print;
730 if (event->funcs->hex == NULL)
731 event->funcs->hex = trace_nop_print;
732 if (event->funcs->binary == NULL)
733 event->funcs->binary = trace_nop_print;
734
735 key = event->type & (EVENT_HASHSIZE - 1);
736
737 hlist_add_head(&event->node, &event_hash[key]);
738
739 ret = event->type;
740 out:
741 up_write(&trace_event_sem);
742
743 return ret;
744 }
745 EXPORT_SYMBOL_GPL(register_trace_event);
746
747 /*
748 * Used by module code with the trace_event_sem held for write.
749 */
__unregister_trace_event(struct trace_event * event)750 int __unregister_trace_event(struct trace_event *event)
751 {
752 hlist_del(&event->node);
753 list_del(&event->list);
754 return 0;
755 }
756
757 /**
758 * unregister_trace_event - remove a no longer used event
759 * @event: the event to remove
760 */
unregister_trace_event(struct trace_event * event)761 int unregister_trace_event(struct trace_event *event)
762 {
763 down_write(&trace_event_sem);
764 __unregister_trace_event(event);
765 up_write(&trace_event_sem);
766
767 return 0;
768 }
769 EXPORT_SYMBOL_GPL(unregister_trace_event);
770
771 /*
772 * Standard events
773 */
774
trace_nop_print(struct trace_iterator * iter,int flags,struct trace_event * event)775 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
776 struct trace_event *event)
777 {
778 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
779
780 return trace_handle_return(&iter->seq);
781 }
782
783 /* TRACE_FN */
trace_fn_trace(struct trace_iterator * iter,int flags,struct trace_event * event)784 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
785 struct trace_event *event)
786 {
787 struct ftrace_entry *field;
788 struct trace_seq *s = &iter->seq;
789
790 trace_assign_type(field, iter->ent);
791
792 seq_print_ip_sym(s, field->ip, flags);
793
794 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
795 trace_seq_puts(s, " <-");
796 seq_print_ip_sym(s, field->parent_ip, flags);
797 }
798
799 trace_seq_putc(s, '\n');
800
801 return trace_handle_return(s);
802 }
803
trace_fn_raw(struct trace_iterator * iter,int flags,struct trace_event * event)804 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
805 struct trace_event *event)
806 {
807 struct ftrace_entry *field;
808
809 trace_assign_type(field, iter->ent);
810
811 trace_seq_printf(&iter->seq, "%lx %lx\n",
812 field->ip,
813 field->parent_ip);
814
815 return trace_handle_return(&iter->seq);
816 }
817
trace_fn_hex(struct trace_iterator * iter,int flags,struct trace_event * event)818 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
819 struct trace_event *event)
820 {
821 struct ftrace_entry *field;
822 struct trace_seq *s = &iter->seq;
823
824 trace_assign_type(field, iter->ent);
825
826 SEQ_PUT_HEX_FIELD(s, field->ip);
827 SEQ_PUT_HEX_FIELD(s, field->parent_ip);
828
829 return trace_handle_return(s);
830 }
831
trace_fn_bin(struct trace_iterator * iter,int flags,struct trace_event * event)832 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
833 struct trace_event *event)
834 {
835 struct ftrace_entry *field;
836 struct trace_seq *s = &iter->seq;
837
838 trace_assign_type(field, iter->ent);
839
840 SEQ_PUT_FIELD(s, field->ip);
841 SEQ_PUT_FIELD(s, field->parent_ip);
842
843 return trace_handle_return(s);
844 }
845
846 static struct trace_event_functions trace_fn_funcs = {
847 .trace = trace_fn_trace,
848 .raw = trace_fn_raw,
849 .hex = trace_fn_hex,
850 .binary = trace_fn_bin,
851 };
852
853 static struct trace_event trace_fn_event = {
854 .type = TRACE_FN,
855 .funcs = &trace_fn_funcs,
856 };
857
858 /* TRACE_GRAPH_ENT */
trace_graph_ent_trace(struct trace_iterator * iter,int flags,struct trace_event * event)859 static enum print_line_t trace_graph_ent_trace(struct trace_iterator *iter, int flags,
860 struct trace_event *event)
861 {
862 struct trace_seq *s = &iter->seq;
863 struct ftrace_graph_ent_entry *field;
864
865 trace_assign_type(field, iter->ent);
866
867 trace_seq_puts(s, "graph_ent: func=");
868 if (trace_seq_has_overflowed(s))
869 return TRACE_TYPE_PARTIAL_LINE;
870
871 if (!seq_print_ip_sym(s, field->graph_ent.func, flags))
872 return TRACE_TYPE_PARTIAL_LINE;
873
874 trace_seq_puts(s, "\n");
875 if (trace_seq_has_overflowed(s))
876 return TRACE_TYPE_PARTIAL_LINE;
877
878 return TRACE_TYPE_HANDLED;
879 }
880
trace_graph_ent_raw(struct trace_iterator * iter,int flags,struct trace_event * event)881 static enum print_line_t trace_graph_ent_raw(struct trace_iterator *iter, int flags,
882 struct trace_event *event)
883 {
884 struct ftrace_graph_ent_entry *field;
885
886 trace_assign_type(field, iter->ent);
887
888 trace_seq_printf(&iter->seq, "%lx %d\n",
889 field->graph_ent.func,
890 field->graph_ent.depth);
891 if (trace_seq_has_overflowed(&iter->seq))
892 return TRACE_TYPE_PARTIAL_LINE;
893
894 return TRACE_TYPE_HANDLED;
895 }
896
trace_graph_ent_hex(struct trace_iterator * iter,int flags,struct trace_event * event)897 static enum print_line_t trace_graph_ent_hex(struct trace_iterator *iter, int flags,
898 struct trace_event *event)
899 {
900 struct ftrace_graph_ent_entry *field;
901 struct trace_seq *s = &iter->seq;
902
903 trace_assign_type(field, iter->ent);
904
905 SEQ_PUT_HEX_FIELD(s, field->graph_ent.func);
906 SEQ_PUT_HEX_FIELD(s, field->graph_ent.depth);
907
908 return TRACE_TYPE_HANDLED;
909 }
910
trace_graph_ent_bin(struct trace_iterator * iter,int flags,struct trace_event * event)911 static enum print_line_t trace_graph_ent_bin(struct trace_iterator *iter, int flags,
912 struct trace_event *event)
913 {
914 struct ftrace_graph_ent_entry *field;
915 struct trace_seq *s = &iter->seq;
916
917 trace_assign_type(field, iter->ent);
918
919 SEQ_PUT_FIELD(s, field->graph_ent.func);
920 SEQ_PUT_FIELD(s, field->graph_ent.depth);
921
922 return TRACE_TYPE_HANDLED;
923 }
924
925 static struct trace_event_functions trace_graph_ent_funcs = {
926 .trace = trace_graph_ent_trace,
927 .raw = trace_graph_ent_raw,
928 .hex = trace_graph_ent_hex,
929 .binary = trace_graph_ent_bin,
930 };
931
932 static struct trace_event trace_graph_ent_event = {
933 .type = TRACE_GRAPH_ENT,
934 .funcs = &trace_graph_ent_funcs,
935 };
936
937 /* TRACE_GRAPH_RET */
trace_graph_ret_trace(struct trace_iterator * iter,int flags,struct trace_event * event)938 static enum print_line_t trace_graph_ret_trace(struct trace_iterator *iter, int flags,
939 struct trace_event *event)
940 {
941 struct trace_seq *s = &iter->seq;
942 struct trace_entry *entry = iter->ent;
943 struct ftrace_graph_ret_entry *field;
944
945 trace_assign_type(field, entry);
946
947 trace_seq_puts(s, "graph_ret: func=");
948 if (trace_seq_has_overflowed(s))
949 return TRACE_TYPE_PARTIAL_LINE;
950
951 if (!seq_print_ip_sym(s, field->ret.func, flags))
952 return TRACE_TYPE_PARTIAL_LINE;
953
954 trace_seq_puts(s, "\n");
955 if (trace_seq_has_overflowed(s))
956 return TRACE_TYPE_PARTIAL_LINE;
957
958 return TRACE_TYPE_HANDLED;
959 }
960
trace_graph_ret_raw(struct trace_iterator * iter,int flags,struct trace_event * event)961 static enum print_line_t trace_graph_ret_raw(struct trace_iterator *iter, int flags,
962 struct trace_event *event)
963 {
964 struct ftrace_graph_ret_entry *field;
965
966 trace_assign_type(field, iter->ent);
967
968 trace_seq_printf(&iter->seq, "%lx %lld %lld %ld %d\n",
969 field->ret.func,
970 field->ret.calltime,
971 field->ret.rettime,
972 field->ret.overrun,
973 field->ret.depth);
974 if (trace_seq_has_overflowed(&iter->seq))
975 return TRACE_TYPE_PARTIAL_LINE;
976
977 return TRACE_TYPE_HANDLED;
978 }
979
trace_graph_ret_hex(struct trace_iterator * iter,int flags,struct trace_event * event)980 static enum print_line_t trace_graph_ret_hex(struct trace_iterator *iter, int flags,
981 struct trace_event *event)
982 {
983 struct ftrace_graph_ret_entry *field;
984 struct trace_seq *s = &iter->seq;
985
986 trace_assign_type(field, iter->ent);
987
988 SEQ_PUT_HEX_FIELD(s, field->ret.func);
989 SEQ_PUT_HEX_FIELD(s, field->ret.calltime);
990 SEQ_PUT_HEX_FIELD(s, field->ret.rettime);
991 SEQ_PUT_HEX_FIELD(s, field->ret.overrun);
992 SEQ_PUT_HEX_FIELD(s, field->ret.depth);
993
994 return TRACE_TYPE_HANDLED;
995 }
996
trace_graph_ret_bin(struct trace_iterator * iter,int flags,struct trace_event * event)997 static enum print_line_t trace_graph_ret_bin(struct trace_iterator *iter, int flags,
998 struct trace_event *event)
999 {
1000 struct ftrace_graph_ret_entry *field;
1001 struct trace_seq *s = &iter->seq;
1002
1003 trace_assign_type(field, iter->ent);
1004
1005 SEQ_PUT_FIELD(s, field->ret.func);
1006 SEQ_PUT_FIELD(s, field->ret.calltime);
1007 SEQ_PUT_FIELD(s, field->ret.rettime);
1008 SEQ_PUT_FIELD(s, field->ret.overrun);
1009 SEQ_PUT_FIELD(s, field->ret.depth);
1010
1011 return TRACE_TYPE_HANDLED;
1012 }
1013
1014 static struct trace_event_functions trace_graph_ret_funcs = {
1015 .trace = trace_graph_ret_trace,
1016 .raw = trace_graph_ret_raw,
1017 .hex = trace_graph_ret_hex,
1018 .binary = trace_graph_ret_bin,
1019 };
1020
1021 static struct trace_event trace_graph_ret_event = {
1022 .type = TRACE_GRAPH_RET,
1023 .funcs = &trace_graph_ret_funcs,
1024 };
1025
1026 /* TRACE_CTX an TRACE_WAKE */
trace_ctxwake_print(struct trace_iterator * iter,char * delim)1027 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
1028 char *delim)
1029 {
1030 struct ctx_switch_entry *field;
1031 char comm[TASK_COMM_LEN];
1032 int S, T;
1033
1034
1035 trace_assign_type(field, iter->ent);
1036
1037 T = task_state_char(field->next_state);
1038 S = task_state_char(field->prev_state);
1039 trace_find_cmdline(field->next_pid, comm);
1040 trace_seq_printf(&iter->seq,
1041 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
1042 field->prev_pid,
1043 field->prev_prio,
1044 S, delim,
1045 field->next_cpu,
1046 field->next_pid,
1047 field->next_prio,
1048 T, comm);
1049
1050 return trace_handle_return(&iter->seq);
1051 }
1052
trace_ctx_print(struct trace_iterator * iter,int flags,struct trace_event * event)1053 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
1054 struct trace_event *event)
1055 {
1056 return trace_ctxwake_print(iter, "==>");
1057 }
1058
trace_wake_print(struct trace_iterator * iter,int flags,struct trace_event * event)1059 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
1060 int flags, struct trace_event *event)
1061 {
1062 return trace_ctxwake_print(iter, " +");
1063 }
1064
trace_ctxwake_raw(struct trace_iterator * iter,char S)1065 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
1066 {
1067 struct ctx_switch_entry *field;
1068 int T;
1069
1070 trace_assign_type(field, iter->ent);
1071
1072 if (!S)
1073 S = task_state_char(field->prev_state);
1074 T = task_state_char(field->next_state);
1075 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
1076 field->prev_pid,
1077 field->prev_prio,
1078 S,
1079 field->next_cpu,
1080 field->next_pid,
1081 field->next_prio,
1082 T);
1083
1084 return trace_handle_return(&iter->seq);
1085 }
1086
trace_ctx_raw(struct trace_iterator * iter,int flags,struct trace_event * event)1087 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
1088 struct trace_event *event)
1089 {
1090 return trace_ctxwake_raw(iter, 0);
1091 }
1092
trace_wake_raw(struct trace_iterator * iter,int flags,struct trace_event * event)1093 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
1094 struct trace_event *event)
1095 {
1096 return trace_ctxwake_raw(iter, '+');
1097 }
1098
1099
trace_ctxwake_hex(struct trace_iterator * iter,char S)1100 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
1101 {
1102 struct ctx_switch_entry *field;
1103 struct trace_seq *s = &iter->seq;
1104 int T;
1105
1106 trace_assign_type(field, iter->ent);
1107
1108 if (!S)
1109 S = task_state_char(field->prev_state);
1110 T = task_state_char(field->next_state);
1111
1112 SEQ_PUT_HEX_FIELD(s, field->prev_pid);
1113 SEQ_PUT_HEX_FIELD(s, field->prev_prio);
1114 SEQ_PUT_HEX_FIELD(s, S);
1115 SEQ_PUT_HEX_FIELD(s, field->next_cpu);
1116 SEQ_PUT_HEX_FIELD(s, field->next_pid);
1117 SEQ_PUT_HEX_FIELD(s, field->next_prio);
1118 SEQ_PUT_HEX_FIELD(s, T);
1119
1120 return trace_handle_return(s);
1121 }
1122
trace_ctx_hex(struct trace_iterator * iter,int flags,struct trace_event * event)1123 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1124 struct trace_event *event)
1125 {
1126 return trace_ctxwake_hex(iter, 0);
1127 }
1128
trace_wake_hex(struct trace_iterator * iter,int flags,struct trace_event * event)1129 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1130 struct trace_event *event)
1131 {
1132 return trace_ctxwake_hex(iter, '+');
1133 }
1134
trace_ctxwake_bin(struct trace_iterator * iter,int flags,struct trace_event * event)1135 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1136 int flags, struct trace_event *event)
1137 {
1138 struct ctx_switch_entry *field;
1139 struct trace_seq *s = &iter->seq;
1140
1141 trace_assign_type(field, iter->ent);
1142
1143 SEQ_PUT_FIELD(s, field->prev_pid);
1144 SEQ_PUT_FIELD(s, field->prev_prio);
1145 SEQ_PUT_FIELD(s, field->prev_state);
1146 SEQ_PUT_FIELD(s, field->next_cpu);
1147 SEQ_PUT_FIELD(s, field->next_pid);
1148 SEQ_PUT_FIELD(s, field->next_prio);
1149 SEQ_PUT_FIELD(s, field->next_state);
1150
1151 return trace_handle_return(s);
1152 }
1153
1154 static struct trace_event_functions trace_ctx_funcs = {
1155 .trace = trace_ctx_print,
1156 .raw = trace_ctx_raw,
1157 .hex = trace_ctx_hex,
1158 .binary = trace_ctxwake_bin,
1159 };
1160
1161 static struct trace_event trace_ctx_event = {
1162 .type = TRACE_CTX,
1163 .funcs = &trace_ctx_funcs,
1164 };
1165
1166 static struct trace_event_functions trace_wake_funcs = {
1167 .trace = trace_wake_print,
1168 .raw = trace_wake_raw,
1169 .hex = trace_wake_hex,
1170 .binary = trace_ctxwake_bin,
1171 };
1172
1173 static struct trace_event trace_wake_event = {
1174 .type = TRACE_WAKE,
1175 .funcs = &trace_wake_funcs,
1176 };
1177
1178 /* TRACE_STACK */
1179
trace_stack_print(struct trace_iterator * iter,int flags,struct trace_event * event)1180 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1181 int flags, struct trace_event *event)
1182 {
1183 struct stack_entry *field;
1184 struct trace_seq *s = &iter->seq;
1185 unsigned long *p;
1186 unsigned long *end;
1187
1188 trace_assign_type(field, iter->ent);
1189 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1190
1191 trace_seq_puts(s, "<stack trace>\n");
1192
1193 for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1194
1195 if (trace_seq_has_overflowed(s))
1196 break;
1197
1198 trace_seq_puts(s, " => ");
1199 seq_print_ip_sym(s, *p, flags);
1200 trace_seq_putc(s, '\n');
1201 }
1202
1203 return trace_handle_return(s);
1204 }
1205
1206 static struct trace_event_functions trace_stack_funcs = {
1207 .trace = trace_stack_print,
1208 };
1209
1210 static struct trace_event trace_stack_event = {
1211 .type = TRACE_STACK,
1212 .funcs = &trace_stack_funcs,
1213 };
1214
1215 /* TRACE_USER_STACK */
trace_user_stack_print(struct trace_iterator * iter,int flags,struct trace_event * event)1216 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1217 int flags, struct trace_event *event)
1218 {
1219 struct trace_array *tr = iter->tr;
1220 struct userstack_entry *field;
1221 struct trace_seq *s = &iter->seq;
1222 struct mm_struct *mm = NULL;
1223 unsigned int i;
1224
1225 trace_assign_type(field, iter->ent);
1226
1227 trace_seq_puts(s, "<user stack trace>\n");
1228
1229 if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
1230 struct task_struct *task;
1231 /*
1232 * we do the lookup on the thread group leader,
1233 * since individual threads might have already quit!
1234 */
1235 rcu_read_lock();
1236 task = find_task_by_vpid(field->tgid);
1237 if (task)
1238 mm = get_task_mm(task);
1239 rcu_read_unlock();
1240 }
1241
1242 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1243 unsigned long ip = field->caller[i];
1244
1245 if (ip == ULONG_MAX || trace_seq_has_overflowed(s))
1246 break;
1247
1248 trace_seq_puts(s, " => ");
1249
1250 if (!ip) {
1251 trace_seq_puts(s, "??");
1252 trace_seq_putc(s, '\n');
1253 continue;
1254 }
1255
1256 seq_print_user_ip(s, mm, ip, flags);
1257 trace_seq_putc(s, '\n');
1258 }
1259
1260 if (mm)
1261 mmput(mm);
1262
1263 return trace_handle_return(s);
1264 }
1265
1266 static struct trace_event_functions trace_user_stack_funcs = {
1267 .trace = trace_user_stack_print,
1268 };
1269
1270 static struct trace_event trace_user_stack_event = {
1271 .type = TRACE_USER_STACK,
1272 .funcs = &trace_user_stack_funcs,
1273 };
1274
1275 /* TRACE_BPUTS */
1276 static enum print_line_t
trace_bputs_print(struct trace_iterator * iter,int flags,struct trace_event * event)1277 trace_bputs_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 bputs_entry *field;
1283
1284 trace_assign_type(field, entry);
1285
1286 seq_print_ip_sym(s, field->ip, flags);
1287 trace_seq_puts(s, ": ");
1288 trace_seq_puts(s, field->str);
1289
1290 return trace_handle_return(s);
1291 }
1292
1293
1294 static enum print_line_t
trace_bputs_raw(struct trace_iterator * iter,int flags,struct trace_event * event)1295 trace_bputs_raw(struct trace_iterator *iter, int flags,
1296 struct trace_event *event)
1297 {
1298 struct bputs_entry *field;
1299 struct trace_seq *s = &iter->seq;
1300
1301 trace_assign_type(field, iter->ent);
1302
1303 trace_seq_printf(s, ": %lx : ", field->ip);
1304 trace_seq_puts(s, field->str);
1305
1306 return trace_handle_return(s);
1307 }
1308
1309 static struct trace_event_functions trace_bputs_funcs = {
1310 .trace = trace_bputs_print,
1311 .raw = trace_bputs_raw,
1312 };
1313
1314 static struct trace_event trace_bputs_event = {
1315 .type = TRACE_BPUTS,
1316 .funcs = &trace_bputs_funcs,
1317 };
1318
1319 /* TRACE_BPRINT */
1320 static enum print_line_t
trace_bprint_print(struct trace_iterator * iter,int flags,struct trace_event * event)1321 trace_bprint_print(struct trace_iterator *iter, int flags,
1322 struct trace_event *event)
1323 {
1324 struct trace_entry *entry = iter->ent;
1325 struct trace_seq *s = &iter->seq;
1326 struct bprint_entry *field;
1327
1328 trace_assign_type(field, entry);
1329
1330 seq_print_ip_sym(s, field->ip, flags);
1331 trace_seq_puts(s, ": ");
1332 trace_seq_bprintf(s, field->fmt, field->buf);
1333
1334 return trace_handle_return(s);
1335 }
1336
1337
1338 static enum print_line_t
trace_bprint_raw(struct trace_iterator * iter,int flags,struct trace_event * event)1339 trace_bprint_raw(struct trace_iterator *iter, int flags,
1340 struct trace_event *event)
1341 {
1342 struct bprint_entry *field;
1343 struct trace_seq *s = &iter->seq;
1344
1345 trace_assign_type(field, iter->ent);
1346
1347 trace_seq_printf(s, ": %lx : ", field->ip);
1348 trace_seq_bprintf(s, field->fmt, field->buf);
1349
1350 return trace_handle_return(s);
1351 }
1352
1353 static struct trace_event_functions trace_bprint_funcs = {
1354 .trace = trace_bprint_print,
1355 .raw = trace_bprint_raw,
1356 };
1357
1358 static struct trace_event trace_bprint_event = {
1359 .type = TRACE_BPRINT,
1360 .funcs = &trace_bprint_funcs,
1361 };
1362
1363 /* TRACE_PRINT */
trace_print_print(struct trace_iterator * iter,int flags,struct trace_event * event)1364 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1365 int flags, struct trace_event *event)
1366 {
1367 struct print_entry *field;
1368 struct trace_seq *s = &iter->seq;
1369
1370 trace_assign_type(field, iter->ent);
1371
1372 seq_print_ip_sym(s, field->ip, flags);
1373 trace_seq_printf(s, ": %s", field->buf);
1374
1375 return trace_handle_return(s);
1376 }
1377
trace_print_raw(struct trace_iterator * iter,int flags,struct trace_event * event)1378 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1379 struct trace_event *event)
1380 {
1381 struct print_entry *field;
1382
1383 trace_assign_type(field, iter->ent);
1384
1385 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1386
1387 return trace_handle_return(&iter->seq);
1388 }
1389
1390 static struct trace_event_functions trace_print_funcs = {
1391 .trace = trace_print_print,
1392 .raw = trace_print_raw,
1393 };
1394
1395 static struct trace_event trace_print_event = {
1396 .type = TRACE_PRINT,
1397 .funcs = &trace_print_funcs,
1398 };
1399
1400
1401 static struct trace_event *events[] __initdata = {
1402 &trace_fn_event,
1403 &trace_graph_ent_event,
1404 &trace_graph_ret_event,
1405 &trace_ctx_event,
1406 &trace_wake_event,
1407 &trace_stack_event,
1408 &trace_user_stack_event,
1409 &trace_bputs_event,
1410 &trace_bprint_event,
1411 &trace_print_event,
1412 NULL
1413 };
1414
init_events(void)1415 __init static int init_events(void)
1416 {
1417 struct trace_event *event;
1418 int i, ret;
1419
1420 for (i = 0; events[i]; i++) {
1421 event = events[i];
1422
1423 ret = register_trace_event(event);
1424 if (!ret) {
1425 printk(KERN_WARNING "event %d failed to register\n",
1426 event->type);
1427 WARN_ON_ONCE(1);
1428 }
1429 }
1430
1431 return 0;
1432 }
1433 early_initcall(init_events);
1434