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 int ret;
29
30 trace_assign_type(field, entry);
31
32 ret = trace_seq_puts(s, field->str);
33 if (!ret)
34 return TRACE_TYPE_PARTIAL_LINE;
35
36 return TRACE_TYPE_HANDLED;
37 }
38
trace_print_bprintk_msg_only(struct trace_iterator * iter)39 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
40 {
41 struct trace_seq *s = &iter->seq;
42 struct trace_entry *entry = iter->ent;
43 struct bprint_entry *field;
44 int ret;
45
46 trace_assign_type(field, entry);
47
48 ret = trace_seq_bprintf(s, field->fmt, field->buf);
49 if (!ret)
50 return TRACE_TYPE_PARTIAL_LINE;
51
52 return TRACE_TYPE_HANDLED;
53 }
54
trace_print_printk_msg_only(struct trace_iterator * iter)55 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
56 {
57 struct trace_seq *s = &iter->seq;
58 struct trace_entry *entry = iter->ent;
59 struct print_entry *field;
60 int ret;
61
62 trace_assign_type(field, entry);
63
64 ret = trace_seq_puts(s, field->buf);
65 if (!ret)
66 return TRACE_TYPE_PARTIAL_LINE;
67
68 return TRACE_TYPE_HANDLED;
69 }
70
71 const char *
ftrace_print_flags_seq(struct trace_seq * p,const char * delim,unsigned long flags,const struct trace_print_flags * flag_array)72 ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
73 unsigned long flags,
74 const struct trace_print_flags *flag_array)
75 {
76 unsigned long mask;
77 const char *str;
78 const char *ret = trace_seq_buffer_ptr(p);
79 int i, first = 1;
80
81 for (i = 0; flag_array[i].name && flags; i++) {
82
83 mask = flag_array[i].mask;
84 if ((flags & mask) != mask)
85 continue;
86
87 str = flag_array[i].name;
88 flags &= ~mask;
89 if (!first && delim)
90 trace_seq_puts(p, delim);
91 else
92 first = 0;
93 trace_seq_puts(p, str);
94 }
95
96 /* check for left over flags */
97 if (flags) {
98 if (!first && delim)
99 trace_seq_puts(p, delim);
100 trace_seq_printf(p, "0x%lx", flags);
101 }
102
103 trace_seq_putc(p, 0);
104
105 return ret;
106 }
107 EXPORT_SYMBOL(ftrace_print_flags_seq);
108
109 const char *
ftrace_print_symbols_seq(struct trace_seq * p,unsigned long val,const struct trace_print_flags * symbol_array)110 ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
111 const struct trace_print_flags *symbol_array)
112 {
113 int i;
114 const char *ret = trace_seq_buffer_ptr(p);
115
116 for (i = 0; symbol_array[i].name; i++) {
117
118 if (val != symbol_array[i].mask)
119 continue;
120
121 trace_seq_puts(p, symbol_array[i].name);
122 break;
123 }
124
125 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
126 trace_seq_printf(p, "0x%lx", val);
127
128 trace_seq_putc(p, 0);
129
130 return ret;
131 }
132 EXPORT_SYMBOL(ftrace_print_symbols_seq);
133
134 #if BITS_PER_LONG == 32
135 const char *
ftrace_print_symbols_seq_u64(struct trace_seq * p,unsigned long long val,const struct trace_print_flags_u64 * symbol_array)136 ftrace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
137 const struct trace_print_flags_u64 *symbol_array)
138 {
139 int i;
140 const char *ret = trace_seq_buffer_ptr(p);
141
142 for (i = 0; symbol_array[i].name; i++) {
143
144 if (val != symbol_array[i].mask)
145 continue;
146
147 trace_seq_puts(p, symbol_array[i].name);
148 break;
149 }
150
151 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
152 trace_seq_printf(p, "0x%llx", val);
153
154 trace_seq_putc(p, 0);
155
156 return ret;
157 }
158 EXPORT_SYMBOL(ftrace_print_symbols_seq_u64);
159 #endif
160
161 const char *
ftrace_print_bitmask_seq(struct trace_seq * p,void * bitmask_ptr,unsigned int bitmask_size)162 ftrace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
163 unsigned int bitmask_size)
164 {
165 const char *ret = trace_seq_buffer_ptr(p);
166
167 trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8);
168 trace_seq_putc(p, 0);
169
170 return ret;
171 }
172 EXPORT_SYMBOL_GPL(ftrace_print_bitmask_seq);
173
174 const char *
ftrace_print_hex_seq(struct trace_seq * p,const unsigned char * buf,int buf_len)175 ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
176 {
177 int i;
178 const char *ret = trace_seq_buffer_ptr(p);
179
180 for (i = 0; i < buf_len; i++)
181 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
182
183 trace_seq_putc(p, 0);
184
185 return ret;
186 }
187 EXPORT_SYMBOL(ftrace_print_hex_seq);
188
ftrace_raw_output_prep(struct trace_iterator * iter,struct trace_event * trace_event)189 int ftrace_raw_output_prep(struct trace_iterator *iter,
190 struct trace_event *trace_event)
191 {
192 struct ftrace_event_call *event;
193 struct trace_seq *s = &iter->seq;
194 struct trace_seq *p = &iter->tmp_seq;
195 struct trace_entry *entry;
196 int ret;
197
198 event = container_of(trace_event, struct ftrace_event_call, event);
199 entry = iter->ent;
200
201 if (entry->type != event->event.type) {
202 WARN_ON_ONCE(1);
203 return TRACE_TYPE_UNHANDLED;
204 }
205
206 trace_seq_init(p);
207 ret = trace_seq_printf(s, "%s: ", ftrace_event_name(event));
208 if (!ret)
209 return TRACE_TYPE_PARTIAL_LINE;
210
211 return 0;
212 }
213 EXPORT_SYMBOL(ftrace_raw_output_prep);
214
ftrace_output_raw(struct trace_iterator * iter,char * name,char * fmt,va_list ap)215 static int ftrace_output_raw(struct trace_iterator *iter, char *name,
216 char *fmt, va_list ap)
217 {
218 struct trace_seq *s = &iter->seq;
219 int ret;
220
221 ret = trace_seq_printf(s, "%s: ", name);
222 if (!ret)
223 return TRACE_TYPE_PARTIAL_LINE;
224
225 ret = trace_seq_vprintf(s, fmt, ap);
226
227 if (!ret)
228 return TRACE_TYPE_PARTIAL_LINE;
229
230 return TRACE_TYPE_HANDLED;
231 }
232
ftrace_output_call(struct trace_iterator * iter,char * name,char * fmt,...)233 int ftrace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
234 {
235 va_list ap;
236 int ret;
237
238 va_start(ap, fmt);
239 ret = ftrace_output_raw(iter, name, fmt, ap);
240 va_end(ap);
241
242 return ret;
243 }
244 EXPORT_SYMBOL_GPL(ftrace_output_call);
245
246 #ifdef CONFIG_KRETPROBES
kretprobed(const char * name)247 static inline const char *kretprobed(const char *name)
248 {
249 static const char tramp_name[] = "kretprobe_trampoline";
250 int size = sizeof(tramp_name);
251
252 if (strncmp(tramp_name, name, size) == 0)
253 return "[unknown/kretprobe'd]";
254 return name;
255 }
256 #else
kretprobed(const char * name)257 static inline const char *kretprobed(const char *name)
258 {
259 return name;
260 }
261 #endif /* CONFIG_KRETPROBES */
262
263 static int
seq_print_sym_short(struct trace_seq * s,const char * fmt,unsigned long address)264 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
265 {
266 #ifdef CONFIG_KALLSYMS
267 char str[KSYM_SYMBOL_LEN];
268 const char *name;
269
270 kallsyms_lookup(address, NULL, NULL, NULL, str);
271
272 name = kretprobed(str);
273
274 return trace_seq_printf(s, fmt, name);
275 #endif
276 return 1;
277 }
278
279 static int
seq_print_sym_offset(struct trace_seq * s,const char * fmt,unsigned long address)280 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
281 unsigned long address)
282 {
283 #ifdef CONFIG_KALLSYMS
284 char str[KSYM_SYMBOL_LEN];
285 const char *name;
286
287 sprint_symbol(str, address);
288 name = kretprobed(str);
289
290 return trace_seq_printf(s, fmt, name);
291 #endif
292 return 1;
293 }
294
295 #ifndef CONFIG_64BIT
296 # define IP_FMT "%08lx"
297 #else
298 # define IP_FMT "%016lx"
299 #endif
300
seq_print_user_ip(struct trace_seq * s,struct mm_struct * mm,unsigned long ip,unsigned long sym_flags)301 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
302 unsigned long ip, unsigned long sym_flags)
303 {
304 struct file *file = NULL;
305 unsigned long vmstart = 0;
306 int ret = 1;
307
308 if (s->full)
309 return 0;
310
311 if (mm) {
312 const struct vm_area_struct *vma;
313
314 down_read(&mm->mmap_sem);
315 vma = find_vma(mm, ip);
316 if (vma) {
317 file = vma->vm_file;
318 vmstart = vma->vm_start;
319 }
320 if (file) {
321 ret = trace_seq_path(s, &file->f_path);
322 if (ret)
323 ret = trace_seq_printf(s, "[+0x%lx]",
324 ip - vmstart);
325 }
326 up_read(&mm->mmap_sem);
327 }
328 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
329 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
330 return ret;
331 }
332
333 int
seq_print_userip_objs(const struct userstack_entry * entry,struct trace_seq * s,unsigned long sym_flags)334 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
335 unsigned long sym_flags)
336 {
337 struct mm_struct *mm = NULL;
338 int ret = 1;
339 unsigned int i;
340
341 if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
342 struct task_struct *task;
343 /*
344 * we do the lookup on the thread group leader,
345 * since individual threads might have already quit!
346 */
347 rcu_read_lock();
348 task = find_task_by_vpid(entry->tgid);
349 if (task)
350 mm = get_task_mm(task);
351 rcu_read_unlock();
352 }
353
354 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
355 unsigned long ip = entry->caller[i];
356
357 if (ip == ULONG_MAX || !ret)
358 break;
359 if (ret)
360 ret = trace_seq_puts(s, " => ");
361 if (!ip) {
362 if (ret)
363 ret = trace_seq_puts(s, "??");
364 if (ret)
365 ret = trace_seq_putc(s, '\n');
366 continue;
367 }
368 if (!ret)
369 break;
370 if (ret)
371 ret = seq_print_user_ip(s, mm, ip, sym_flags);
372 ret = trace_seq_putc(s, '\n');
373 }
374
375 if (mm)
376 mmput(mm);
377 return ret;
378 }
379
380 int
seq_print_ip_sym(struct trace_seq * s,unsigned long ip,unsigned long sym_flags)381 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
382 {
383 int ret;
384
385 if (!ip)
386 return trace_seq_putc(s, '0');
387
388 if (sym_flags & TRACE_ITER_SYM_OFFSET)
389 ret = seq_print_sym_offset(s, "%s", ip);
390 else
391 ret = seq_print_sym_short(s, "%s", ip);
392
393 if (!ret)
394 return 0;
395
396 if (sym_flags & TRACE_ITER_SYM_ADDR)
397 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
398 return ret;
399 }
400
401 /**
402 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
403 * @s: trace seq struct to write to
404 * @entry: The trace entry field from the ring buffer
405 *
406 * Prints the generic fields of irqs off, in hard or softirq, preempt
407 * count.
408 */
trace_print_lat_fmt(struct trace_seq * s,struct trace_entry * entry)409 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
410 {
411 char hardsoft_irq;
412 char need_resched;
413 char irqs_off;
414 int hardirq;
415 int softirq;
416 int ret;
417
418 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
419 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
420
421 irqs_off =
422 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
423 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
424 '.';
425
426 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
427 TRACE_FLAG_PREEMPT_RESCHED)) {
428 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
429 need_resched = 'N';
430 break;
431 case TRACE_FLAG_NEED_RESCHED:
432 need_resched = 'n';
433 break;
434 case TRACE_FLAG_PREEMPT_RESCHED:
435 need_resched = 'p';
436 break;
437 default:
438 need_resched = '.';
439 break;
440 }
441
442 hardsoft_irq =
443 (hardirq && softirq) ? 'H' :
444 hardirq ? 'h' :
445 softirq ? 's' :
446 '.';
447
448 if (!trace_seq_printf(s, "%c%c%c",
449 irqs_off, need_resched, hardsoft_irq))
450 return 0;
451
452 if (entry->preempt_count)
453 ret = trace_seq_printf(s, "%x", entry->preempt_count);
454 else
455 ret = trace_seq_putc(s, '.');
456
457 return ret;
458 }
459
460 static int
lat_print_generic(struct trace_seq * s,struct trace_entry * entry,int cpu)461 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
462 {
463 char comm[TASK_COMM_LEN];
464
465 trace_find_cmdline(entry->pid, comm);
466
467 if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
468 comm, entry->pid, cpu))
469 return 0;
470
471 return trace_print_lat_fmt(s, entry);
472 }
473
474 static unsigned long preempt_mark_thresh_us = 100;
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 unsigned long verbose = trace_flags & TRACE_ITER_VERBOSE;
480 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
481 unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start;
482 unsigned long long rel_ts = next_ts - iter->ts;
483 struct trace_seq *s = &iter->seq;
484
485 if (in_ns) {
486 abs_ts = ns2usecs(abs_ts);
487 rel_ts = ns2usecs(rel_ts);
488 }
489
490 if (verbose && in_ns) {
491 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
492 unsigned long abs_msec = (unsigned long)abs_ts;
493 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
494 unsigned long rel_msec = (unsigned long)rel_ts;
495
496 return trace_seq_printf(
497 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
498 ns2usecs(iter->ts),
499 abs_msec, abs_usec,
500 rel_msec, rel_usec);
501 } else if (verbose && !in_ns) {
502 return trace_seq_printf(
503 s, "[%016llx] %lld (+%lld): ",
504 iter->ts, abs_ts, rel_ts);
505 } else if (!verbose && in_ns) {
506 return trace_seq_printf(
507 s, " %4lldus%c: ",
508 abs_ts,
509 rel_ts > preempt_mark_thresh_us ? '!' :
510 rel_ts > 1 ? '+' : ' ');
511 } else { /* !verbose && !in_ns */
512 return trace_seq_printf(s, " %4lld: ", abs_ts);
513 }
514 }
515
trace_print_context(struct trace_iterator * iter)516 int trace_print_context(struct trace_iterator *iter)
517 {
518 struct trace_seq *s = &iter->seq;
519 struct trace_entry *entry = iter->ent;
520 unsigned long long t;
521 unsigned long secs, usec_rem;
522 char comm[TASK_COMM_LEN];
523 int ret;
524 int tgid;
525
526 trace_find_cmdline(entry->pid, comm);
527
528 ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid);
529 if (!ret)
530 return 0;
531
532 if (trace_flags & TRACE_ITER_TGID) {
533 tgid = trace_find_tgid(entry->pid);
534 if (tgid < 0)
535 ret = trace_seq_puts(s, "(-----) ");
536 else
537 ret = trace_seq_printf(s, "(%5d) ", tgid);
538 if (!ret)
539 return 0;
540 }
541
542 ret = trace_seq_printf(s, "[%03d] ", iter->cpu);
543 if (!ret)
544 return 0;
545
546 if (trace_flags & TRACE_ITER_IRQ_INFO) {
547 ret = trace_print_lat_fmt(s, entry);
548 if (!ret)
549 return 0;
550 }
551
552 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
553 t = ns2usecs(iter->ts);
554 usec_rem = do_div(t, USEC_PER_SEC);
555 secs = (unsigned long)t;
556 return trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
557 } else
558 return trace_seq_printf(s, " %12llu: ", iter->ts);
559 }
560
trace_print_lat_context(struct trace_iterator * iter)561 int trace_print_lat_context(struct trace_iterator *iter)
562 {
563 u64 next_ts;
564 int ret;
565 /* trace_find_next_entry will reset ent_size */
566 int ent_size = iter->ent_size;
567 struct trace_seq *s = &iter->seq;
568 struct trace_entry *entry = iter->ent,
569 *next_entry = trace_find_next_entry(iter, NULL,
570 &next_ts);
571 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
572
573 /* Restore the original ent_size */
574 iter->ent_size = ent_size;
575
576 if (!next_entry)
577 next_ts = iter->ts;
578
579 if (verbose) {
580 char comm[TASK_COMM_LEN];
581
582 trace_find_cmdline(entry->pid, comm);
583
584 ret = trace_seq_printf(
585 s, "%16s %5d %3d %d %08x %08lx ",
586 comm, entry->pid, iter->cpu, entry->flags,
587 entry->preempt_count, iter->idx);
588 } else {
589 ret = lat_print_generic(s, entry, iter->cpu);
590 }
591
592 if (ret)
593 ret = lat_print_timestamp(iter, next_ts);
594
595 return ret;
596 }
597
598 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
599
task_state_char(unsigned long state)600 static int task_state_char(unsigned long state)
601 {
602 int bit = state ? __ffs(state) + 1 : 0;
603
604 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
605 }
606
607 /**
608 * ftrace_find_event - find a registered event
609 * @type: the type of event to look for
610 *
611 * Returns an event of type @type otherwise NULL
612 * Called with trace_event_read_lock() held.
613 */
ftrace_find_event(int type)614 struct trace_event *ftrace_find_event(int type)
615 {
616 struct trace_event *event;
617 unsigned key;
618
619 key = type & (EVENT_HASHSIZE - 1);
620
621 hlist_for_each_entry(event, &event_hash[key], node) {
622 if (event->type == type)
623 return event;
624 }
625
626 return NULL;
627 }
628
629 static LIST_HEAD(ftrace_event_list);
630
trace_search_list(struct list_head ** list)631 static int trace_search_list(struct list_head **list)
632 {
633 struct trace_event *e;
634 int last = __TRACE_LAST_TYPE;
635
636 if (list_empty(&ftrace_event_list)) {
637 *list = &ftrace_event_list;
638 return last + 1;
639 }
640
641 /*
642 * We used up all possible max events,
643 * lets see if somebody freed one.
644 */
645 list_for_each_entry(e, &ftrace_event_list, list) {
646 if (e->type != last + 1)
647 break;
648 last++;
649 }
650
651 /* Did we used up all 65 thousand events??? */
652 if ((last + 1) > FTRACE_MAX_EVENT)
653 return 0;
654
655 *list = &e->list;
656 return last + 1;
657 }
658
trace_event_read_lock(void)659 void trace_event_read_lock(void)
660 {
661 down_read(&trace_event_sem);
662 }
663
trace_event_read_unlock(void)664 void trace_event_read_unlock(void)
665 {
666 up_read(&trace_event_sem);
667 }
668
669 /**
670 * register_ftrace_event - register output for an event type
671 * @event: the event type to register
672 *
673 * Event types are stored in a hash and this hash is used to
674 * find a way to print an event. If the @event->type is set
675 * then it will use that type, otherwise it will assign a
676 * type to use.
677 *
678 * If you assign your own type, please make sure it is added
679 * to the trace_type enum in trace.h, to avoid collisions
680 * with the dynamic types.
681 *
682 * Returns the event type number or zero on error.
683 */
register_ftrace_event(struct trace_event * event)684 int register_ftrace_event(struct trace_event *event)
685 {
686 unsigned key;
687 int ret = 0;
688
689 down_write(&trace_event_sem);
690
691 if (WARN_ON(!event))
692 goto out;
693
694 if (WARN_ON(!event->funcs))
695 goto out;
696
697 INIT_LIST_HEAD(&event->list);
698
699 if (!event->type) {
700 struct list_head *list = NULL;
701
702 if (next_event_type > FTRACE_MAX_EVENT) {
703
704 event->type = trace_search_list(&list);
705 if (!event->type)
706 goto out;
707
708 } else {
709
710 event->type = next_event_type++;
711 list = &ftrace_event_list;
712 }
713
714 if (WARN_ON(ftrace_find_event(event->type)))
715 goto out;
716
717 list_add_tail(&event->list, list);
718
719 } else if (event->type > __TRACE_LAST_TYPE) {
720 printk(KERN_WARNING "Need to add type to trace.h\n");
721 WARN_ON(1);
722 goto out;
723 } else {
724 /* Is this event already used */
725 if (ftrace_find_event(event->type))
726 goto out;
727 }
728
729 if (event->funcs->trace == NULL)
730 event->funcs->trace = trace_nop_print;
731 if (event->funcs->raw == NULL)
732 event->funcs->raw = trace_nop_print;
733 if (event->funcs->hex == NULL)
734 event->funcs->hex = trace_nop_print;
735 if (event->funcs->binary == NULL)
736 event->funcs->binary = trace_nop_print;
737
738 key = event->type & (EVENT_HASHSIZE - 1);
739
740 hlist_add_head(&event->node, &event_hash[key]);
741
742 ret = event->type;
743 out:
744 up_write(&trace_event_sem);
745
746 return ret;
747 }
748 EXPORT_SYMBOL_GPL(register_ftrace_event);
749
750 /*
751 * Used by module code with the trace_event_sem held for write.
752 */
__unregister_ftrace_event(struct trace_event * event)753 int __unregister_ftrace_event(struct trace_event *event)
754 {
755 hlist_del(&event->node);
756 list_del(&event->list);
757 return 0;
758 }
759
760 /**
761 * unregister_ftrace_event - remove a no longer used event
762 * @event: the event to remove
763 */
unregister_ftrace_event(struct trace_event * event)764 int unregister_ftrace_event(struct trace_event *event)
765 {
766 down_write(&trace_event_sem);
767 __unregister_ftrace_event(event);
768 up_write(&trace_event_sem);
769
770 return 0;
771 }
772 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
773
774 /*
775 * Standard events
776 */
777
trace_nop_print(struct trace_iterator * iter,int flags,struct trace_event * event)778 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
779 struct trace_event *event)
780 {
781 if (!trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type))
782 return TRACE_TYPE_PARTIAL_LINE;
783
784 return TRACE_TYPE_HANDLED;
785 }
786
787 /* TRACE_FN */
trace_fn_trace(struct trace_iterator * iter,int flags,struct trace_event * event)788 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
789 struct trace_event *event)
790 {
791 struct ftrace_entry *field;
792 struct trace_seq *s = &iter->seq;
793
794 trace_assign_type(field, iter->ent);
795
796 if (!seq_print_ip_sym(s, field->ip, flags))
797 goto partial;
798
799 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
800 if (!trace_seq_puts(s, " <-"))
801 goto partial;
802 if (!seq_print_ip_sym(s,
803 field->parent_ip,
804 flags))
805 goto partial;
806 }
807 if (!trace_seq_putc(s, '\n'))
808 goto partial;
809
810 return TRACE_TYPE_HANDLED;
811
812 partial:
813 return TRACE_TYPE_PARTIAL_LINE;
814 }
815
trace_fn_raw(struct trace_iterator * iter,int flags,struct trace_event * event)816 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
817 struct trace_event *event)
818 {
819 struct ftrace_entry *field;
820
821 trace_assign_type(field, iter->ent);
822
823 if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
824 field->ip,
825 field->parent_ip))
826 return TRACE_TYPE_PARTIAL_LINE;
827
828 return TRACE_TYPE_HANDLED;
829 }
830
trace_fn_hex(struct trace_iterator * iter,int flags,struct trace_event * event)831 static enum print_line_t trace_fn_hex(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 SEQ_PUT_HEX_FIELD_RET(s, field->ip);
840 SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
841
842 return TRACE_TYPE_HANDLED;
843 }
844
trace_fn_bin(struct trace_iterator * iter,int flags,struct trace_event * event)845 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
846 struct trace_event *event)
847 {
848 struct ftrace_entry *field;
849 struct trace_seq *s = &iter->seq;
850
851 trace_assign_type(field, iter->ent);
852
853 SEQ_PUT_FIELD_RET(s, field->ip);
854 SEQ_PUT_FIELD_RET(s, field->parent_ip);
855
856 return TRACE_TYPE_HANDLED;
857 }
858
859 static struct trace_event_functions trace_fn_funcs = {
860 .trace = trace_fn_trace,
861 .raw = trace_fn_raw,
862 .hex = trace_fn_hex,
863 .binary = trace_fn_bin,
864 };
865
866 static struct trace_event trace_fn_event = {
867 .type = TRACE_FN,
868 .funcs = &trace_fn_funcs,
869 };
870
871 /* TRACE_GRAPH_ENT */
trace_graph_ent_trace(struct trace_iterator * iter,int flags,struct trace_event * event)872 static enum print_line_t trace_graph_ent_trace(struct trace_iterator *iter, int flags,
873 struct trace_event *event)
874 {
875 struct trace_seq *s = &iter->seq;
876 struct ftrace_graph_ent_entry *field;
877
878 trace_assign_type(field, iter->ent);
879
880 if (!trace_seq_puts(s, "graph_ent: func="))
881 return TRACE_TYPE_PARTIAL_LINE;
882
883 if (!seq_print_ip_sym(s, field->graph_ent.func, flags))
884 return TRACE_TYPE_PARTIAL_LINE;
885
886 if (!trace_seq_puts(s, "\n"))
887 return TRACE_TYPE_PARTIAL_LINE;
888
889 return TRACE_TYPE_HANDLED;
890 }
891
trace_graph_ent_raw(struct trace_iterator * iter,int flags,struct trace_event * event)892 static enum print_line_t trace_graph_ent_raw(struct trace_iterator *iter, int flags,
893 struct trace_event *event)
894 {
895 struct ftrace_graph_ent_entry *field;
896
897 trace_assign_type(field, iter->ent);
898
899 if (!trace_seq_printf(&iter->seq, "%lx %d\n",
900 field->graph_ent.func,
901 field->graph_ent.depth))
902 return TRACE_TYPE_PARTIAL_LINE;
903
904 return TRACE_TYPE_HANDLED;
905 }
906
trace_graph_ent_hex(struct trace_iterator * iter,int flags,struct trace_event * event)907 static enum print_line_t trace_graph_ent_hex(struct trace_iterator *iter, int flags,
908 struct trace_event *event)
909 {
910 struct ftrace_graph_ent_entry *field;
911 struct trace_seq *s = &iter->seq;
912
913 trace_assign_type(field, iter->ent);
914
915 SEQ_PUT_HEX_FIELD_RET(s, field->graph_ent.func);
916 SEQ_PUT_HEX_FIELD_RET(s, field->graph_ent.depth);
917
918 return TRACE_TYPE_HANDLED;
919 }
920
trace_graph_ent_bin(struct trace_iterator * iter,int flags,struct trace_event * event)921 static enum print_line_t trace_graph_ent_bin(struct trace_iterator *iter, int flags,
922 struct trace_event *event)
923 {
924 struct ftrace_graph_ent_entry *field;
925 struct trace_seq *s = &iter->seq;
926
927 trace_assign_type(field, iter->ent);
928
929 SEQ_PUT_FIELD_RET(s, field->graph_ent.func);
930 SEQ_PUT_FIELD_RET(s, field->graph_ent.depth);
931
932 return TRACE_TYPE_HANDLED;
933 }
934
935 static struct trace_event_functions trace_graph_ent_funcs = {
936 .trace = trace_graph_ent_trace,
937 .raw = trace_graph_ent_raw,
938 .hex = trace_graph_ent_hex,
939 .binary = trace_graph_ent_bin,
940 };
941
942 static struct trace_event trace_graph_ent_event = {
943 .type = TRACE_GRAPH_ENT,
944 .funcs = &trace_graph_ent_funcs,
945 };
946
947 /* TRACE_GRAPH_RET */
trace_graph_ret_trace(struct trace_iterator * iter,int flags,struct trace_event * event)948 static enum print_line_t trace_graph_ret_trace(struct trace_iterator *iter, int flags,
949 struct trace_event *event)
950 {
951 struct trace_seq *s = &iter->seq;
952 struct trace_entry *entry = iter->ent;
953 struct ftrace_graph_ret_entry *field;
954
955 trace_assign_type(field, entry);
956
957 if (!trace_seq_puts(s, "graph_ret: func="))
958 return TRACE_TYPE_PARTIAL_LINE;
959
960 if (!seq_print_ip_sym(s, field->ret.func, flags))
961 return TRACE_TYPE_PARTIAL_LINE;
962
963 if (!trace_seq_puts(s, "\n"))
964 return TRACE_TYPE_PARTIAL_LINE;
965
966 return TRACE_TYPE_HANDLED;
967 }
968
trace_graph_ret_raw(struct trace_iterator * iter,int flags,struct trace_event * event)969 static enum print_line_t trace_graph_ret_raw(struct trace_iterator *iter, int flags,
970 struct trace_event *event)
971 {
972 struct ftrace_graph_ret_entry *field;
973
974 trace_assign_type(field, iter->ent);
975
976 if (!trace_seq_printf(&iter->seq, "%lx %lld %lld %ld %d\n",
977 field->ret.func,
978 field->ret.calltime,
979 field->ret.rettime,
980 field->ret.overrun,
981 field->ret.depth))
982 return TRACE_TYPE_PARTIAL_LINE;
983
984 return TRACE_TYPE_HANDLED;
985 }
986
trace_graph_ret_hex(struct trace_iterator * iter,int flags,struct trace_event * event)987 static enum print_line_t trace_graph_ret_hex(struct trace_iterator *iter, int flags,
988 struct trace_event *event)
989 {
990 struct ftrace_graph_ret_entry *field;
991 struct trace_seq *s = &iter->seq;
992
993 trace_assign_type(field, iter->ent);
994
995 SEQ_PUT_HEX_FIELD_RET(s, field->ret.func);
996 SEQ_PUT_HEX_FIELD_RET(s, field->ret.calltime);
997 SEQ_PUT_HEX_FIELD_RET(s, field->ret.rettime);
998 SEQ_PUT_HEX_FIELD_RET(s, field->ret.overrun);
999 SEQ_PUT_HEX_FIELD_RET(s, field->ret.depth);
1000
1001 return TRACE_TYPE_HANDLED;
1002 }
1003
trace_graph_ret_bin(struct trace_iterator * iter,int flags,struct trace_event * event)1004 static enum print_line_t trace_graph_ret_bin(struct trace_iterator *iter, int flags,
1005 struct trace_event *event)
1006 {
1007 struct ftrace_graph_ret_entry *field;
1008 struct trace_seq *s = &iter->seq;
1009
1010 trace_assign_type(field, iter->ent);
1011
1012 SEQ_PUT_FIELD_RET(s, field->ret.func);
1013 SEQ_PUT_FIELD_RET(s, field->ret.calltime);
1014 SEQ_PUT_FIELD_RET(s, field->ret.rettime);
1015 SEQ_PUT_FIELD_RET(s, field->ret.overrun);
1016 SEQ_PUT_FIELD_RET(s, field->ret.depth);
1017
1018 return TRACE_TYPE_HANDLED;
1019 }
1020
1021 static struct trace_event_functions trace_graph_ret_funcs = {
1022 .trace = trace_graph_ret_trace,
1023 .raw = trace_graph_ret_raw,
1024 .hex = trace_graph_ret_hex,
1025 .binary = trace_graph_ret_bin,
1026 };
1027
1028 static struct trace_event trace_graph_ret_event = {
1029 .type = TRACE_GRAPH_RET,
1030 .funcs = &trace_graph_ret_funcs,
1031 };
1032
1033 /* TRACE_CTX an TRACE_WAKE */
trace_ctxwake_print(struct trace_iterator * iter,char * delim)1034 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
1035 char *delim)
1036 {
1037 struct ctx_switch_entry *field;
1038 char comm[TASK_COMM_LEN];
1039 int S, T;
1040
1041
1042 trace_assign_type(field, iter->ent);
1043
1044 T = task_state_char(field->next_state);
1045 S = task_state_char(field->prev_state);
1046 trace_find_cmdline(field->next_pid, comm);
1047 if (!trace_seq_printf(&iter->seq,
1048 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
1049 field->prev_pid,
1050 field->prev_prio,
1051 S, delim,
1052 field->next_cpu,
1053 field->next_pid,
1054 field->next_prio,
1055 T, comm))
1056 return TRACE_TYPE_PARTIAL_LINE;
1057
1058 return TRACE_TYPE_HANDLED;
1059 }
1060
trace_ctx_print(struct trace_iterator * iter,int flags,struct trace_event * event)1061 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
1062 struct trace_event *event)
1063 {
1064 return trace_ctxwake_print(iter, "==>");
1065 }
1066
trace_wake_print(struct trace_iterator * iter,int flags,struct trace_event * event)1067 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
1068 int flags, struct trace_event *event)
1069 {
1070 return trace_ctxwake_print(iter, " +");
1071 }
1072
trace_ctxwake_raw(struct trace_iterator * iter,char S)1073 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
1074 {
1075 struct ctx_switch_entry *field;
1076 int T;
1077
1078 trace_assign_type(field, iter->ent);
1079
1080 if (!S)
1081 S = task_state_char(field->prev_state);
1082 T = task_state_char(field->next_state);
1083 if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
1084 field->prev_pid,
1085 field->prev_prio,
1086 S,
1087 field->next_cpu,
1088 field->next_pid,
1089 field->next_prio,
1090 T))
1091 return TRACE_TYPE_PARTIAL_LINE;
1092
1093 return TRACE_TYPE_HANDLED;
1094 }
1095
trace_ctx_raw(struct trace_iterator * iter,int flags,struct trace_event * event)1096 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
1097 struct trace_event *event)
1098 {
1099 return trace_ctxwake_raw(iter, 0);
1100 }
1101
trace_wake_raw(struct trace_iterator * iter,int flags,struct trace_event * event)1102 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
1103 struct trace_event *event)
1104 {
1105 return trace_ctxwake_raw(iter, '+');
1106 }
1107
1108
trace_ctxwake_hex(struct trace_iterator * iter,char S)1109 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
1110 {
1111 struct ctx_switch_entry *field;
1112 struct trace_seq *s = &iter->seq;
1113 int T;
1114
1115 trace_assign_type(field, iter->ent);
1116
1117 if (!S)
1118 S = task_state_char(field->prev_state);
1119 T = task_state_char(field->next_state);
1120
1121 SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
1122 SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
1123 SEQ_PUT_HEX_FIELD_RET(s, S);
1124 SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
1125 SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
1126 SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
1127 SEQ_PUT_HEX_FIELD_RET(s, T);
1128
1129 return TRACE_TYPE_HANDLED;
1130 }
1131
trace_ctx_hex(struct trace_iterator * iter,int flags,struct trace_event * event)1132 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1133 struct trace_event *event)
1134 {
1135 return trace_ctxwake_hex(iter, 0);
1136 }
1137
trace_wake_hex(struct trace_iterator * iter,int flags,struct trace_event * event)1138 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1139 struct trace_event *event)
1140 {
1141 return trace_ctxwake_hex(iter, '+');
1142 }
1143
trace_ctxwake_bin(struct trace_iterator * iter,int flags,struct trace_event * event)1144 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1145 int flags, struct trace_event *event)
1146 {
1147 struct ctx_switch_entry *field;
1148 struct trace_seq *s = &iter->seq;
1149
1150 trace_assign_type(field, iter->ent);
1151
1152 SEQ_PUT_FIELD_RET(s, field->prev_pid);
1153 SEQ_PUT_FIELD_RET(s, field->prev_prio);
1154 SEQ_PUT_FIELD_RET(s, field->prev_state);
1155 SEQ_PUT_FIELD_RET(s, field->next_pid);
1156 SEQ_PUT_FIELD_RET(s, field->next_prio);
1157 SEQ_PUT_FIELD_RET(s, field->next_state);
1158
1159 return TRACE_TYPE_HANDLED;
1160 }
1161
1162 static struct trace_event_functions trace_ctx_funcs = {
1163 .trace = trace_ctx_print,
1164 .raw = trace_ctx_raw,
1165 .hex = trace_ctx_hex,
1166 .binary = trace_ctxwake_bin,
1167 };
1168
1169 static struct trace_event trace_ctx_event = {
1170 .type = TRACE_CTX,
1171 .funcs = &trace_ctx_funcs,
1172 };
1173
1174 static struct trace_event_functions trace_wake_funcs = {
1175 .trace = trace_wake_print,
1176 .raw = trace_wake_raw,
1177 .hex = trace_wake_hex,
1178 .binary = trace_ctxwake_bin,
1179 };
1180
1181 static struct trace_event trace_wake_event = {
1182 .type = TRACE_WAKE,
1183 .funcs = &trace_wake_funcs,
1184 };
1185
1186 /* TRACE_STACK */
1187
trace_stack_print(struct trace_iterator * iter,int flags,struct trace_event * event)1188 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1189 int flags, struct trace_event *event)
1190 {
1191 struct stack_entry *field;
1192 struct trace_seq *s = &iter->seq;
1193 unsigned long *p;
1194 unsigned long *end;
1195
1196 trace_assign_type(field, iter->ent);
1197 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1198
1199 if (!trace_seq_puts(s, "<stack trace>\n"))
1200 goto partial;
1201
1202 for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1203 if (!trace_seq_puts(s, " => "))
1204 goto partial;
1205
1206 if (!seq_print_ip_sym(s, *p, flags))
1207 goto partial;
1208 if (!trace_seq_putc(s, '\n'))
1209 goto partial;
1210 }
1211
1212 return TRACE_TYPE_HANDLED;
1213
1214 partial:
1215 return TRACE_TYPE_PARTIAL_LINE;
1216 }
1217
1218 static struct trace_event_functions trace_stack_funcs = {
1219 .trace = trace_stack_print,
1220 };
1221
1222 static struct trace_event trace_stack_event = {
1223 .type = TRACE_STACK,
1224 .funcs = &trace_stack_funcs,
1225 };
1226
1227 /* TRACE_USER_STACK */
trace_user_stack_print(struct trace_iterator * iter,int flags,struct trace_event * event)1228 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1229 int flags, struct trace_event *event)
1230 {
1231 struct userstack_entry *field;
1232 struct trace_seq *s = &iter->seq;
1233
1234 trace_assign_type(field, iter->ent);
1235
1236 if (!trace_seq_puts(s, "<user stack trace>\n"))
1237 goto partial;
1238
1239 if (!seq_print_userip_objs(field, s, flags))
1240 goto partial;
1241
1242 return TRACE_TYPE_HANDLED;
1243
1244 partial:
1245 return TRACE_TYPE_PARTIAL_LINE;
1246 }
1247
1248 static struct trace_event_functions trace_user_stack_funcs = {
1249 .trace = trace_user_stack_print,
1250 };
1251
1252 static struct trace_event trace_user_stack_event = {
1253 .type = TRACE_USER_STACK,
1254 .funcs = &trace_user_stack_funcs,
1255 };
1256
1257 /* TRACE_BPUTS */
1258 static enum print_line_t
trace_bputs_print(struct trace_iterator * iter,int flags,struct trace_event * event)1259 trace_bputs_print(struct trace_iterator *iter, int flags,
1260 struct trace_event *event)
1261 {
1262 struct trace_entry *entry = iter->ent;
1263 struct trace_seq *s = &iter->seq;
1264 struct bputs_entry *field;
1265
1266 trace_assign_type(field, entry);
1267
1268 if (!seq_print_ip_sym(s, field->ip, flags))
1269 goto partial;
1270
1271 if (!trace_seq_puts(s, ": "))
1272 goto partial;
1273
1274 if (!trace_seq_puts(s, field->str))
1275 goto partial;
1276
1277 return TRACE_TYPE_HANDLED;
1278
1279 partial:
1280 return TRACE_TYPE_PARTIAL_LINE;
1281 }
1282
1283
1284 static enum print_line_t
trace_bputs_raw(struct trace_iterator * iter,int flags,struct trace_event * event)1285 trace_bputs_raw(struct trace_iterator *iter, int flags,
1286 struct trace_event *event)
1287 {
1288 struct bputs_entry *field;
1289 struct trace_seq *s = &iter->seq;
1290
1291 trace_assign_type(field, iter->ent);
1292
1293 if (!trace_seq_printf(s, ": %lx : ", field->ip))
1294 goto partial;
1295
1296 if (!trace_seq_puts(s, field->str))
1297 goto partial;
1298
1299 return TRACE_TYPE_HANDLED;
1300
1301 partial:
1302 return TRACE_TYPE_PARTIAL_LINE;
1303 }
1304
1305 static struct trace_event_functions trace_bputs_funcs = {
1306 .trace = trace_bputs_print,
1307 .raw = trace_bputs_raw,
1308 };
1309
1310 static struct trace_event trace_bputs_event = {
1311 .type = TRACE_BPUTS,
1312 .funcs = &trace_bputs_funcs,
1313 };
1314
1315 /* TRACE_BPRINT */
1316 static enum print_line_t
trace_bprint_print(struct trace_iterator * iter,int flags,struct trace_event * event)1317 trace_bprint_print(struct trace_iterator *iter, int flags,
1318 struct trace_event *event)
1319 {
1320 struct trace_entry *entry = iter->ent;
1321 struct trace_seq *s = &iter->seq;
1322 struct bprint_entry *field;
1323
1324 trace_assign_type(field, entry);
1325
1326 if (!seq_print_ip_sym(s, field->ip, flags))
1327 goto partial;
1328
1329 if (!trace_seq_puts(s, ": "))
1330 goto partial;
1331
1332 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1333 goto partial;
1334
1335 return TRACE_TYPE_HANDLED;
1336
1337 partial:
1338 return TRACE_TYPE_PARTIAL_LINE;
1339 }
1340
1341
1342 static enum print_line_t
trace_bprint_raw(struct trace_iterator * iter,int flags,struct trace_event * event)1343 trace_bprint_raw(struct trace_iterator *iter, int flags,
1344 struct trace_event *event)
1345 {
1346 struct bprint_entry *field;
1347 struct trace_seq *s = &iter->seq;
1348
1349 trace_assign_type(field, iter->ent);
1350
1351 if (!trace_seq_printf(s, ": %lx : ", field->ip))
1352 goto partial;
1353
1354 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1355 goto partial;
1356
1357 return TRACE_TYPE_HANDLED;
1358
1359 partial:
1360 return TRACE_TYPE_PARTIAL_LINE;
1361 }
1362
1363 static struct trace_event_functions trace_bprint_funcs = {
1364 .trace = trace_bprint_print,
1365 .raw = trace_bprint_raw,
1366 };
1367
1368 static struct trace_event trace_bprint_event = {
1369 .type = TRACE_BPRINT,
1370 .funcs = &trace_bprint_funcs,
1371 };
1372
1373 /* TRACE_PRINT */
trace_print_print(struct trace_iterator * iter,int flags,struct trace_event * event)1374 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1375 int flags, struct trace_event *event)
1376 {
1377 struct print_entry *field;
1378 struct trace_seq *s = &iter->seq;
1379
1380 trace_assign_type(field, iter->ent);
1381
1382 if (!seq_print_ip_sym(s, field->ip, flags))
1383 goto partial;
1384
1385 if (!trace_seq_printf(s, ": %s", field->buf))
1386 goto partial;
1387
1388 return TRACE_TYPE_HANDLED;
1389
1390 partial:
1391 return TRACE_TYPE_PARTIAL_LINE;
1392 }
1393
trace_print_raw(struct trace_iterator * iter,int flags,struct trace_event * event)1394 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1395 struct trace_event *event)
1396 {
1397 struct print_entry *field;
1398
1399 trace_assign_type(field, iter->ent);
1400
1401 if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1402 goto partial;
1403
1404 return TRACE_TYPE_HANDLED;
1405
1406 partial:
1407 return TRACE_TYPE_PARTIAL_LINE;
1408 }
1409
1410 static struct trace_event_functions trace_print_funcs = {
1411 .trace = trace_print_print,
1412 .raw = trace_print_raw,
1413 };
1414
1415 static struct trace_event trace_print_event = {
1416 .type = TRACE_PRINT,
1417 .funcs = &trace_print_funcs,
1418 };
1419
1420
1421 static struct trace_event *events[] __initdata = {
1422 &trace_fn_event,
1423 &trace_graph_ent_event,
1424 &trace_graph_ret_event,
1425 &trace_ctx_event,
1426 &trace_wake_event,
1427 &trace_stack_event,
1428 &trace_user_stack_event,
1429 &trace_bputs_event,
1430 &trace_bprint_event,
1431 &trace_print_event,
1432 NULL
1433 };
1434
init_events(void)1435 __init static int init_events(void)
1436 {
1437 struct trace_event *event;
1438 int i, ret;
1439
1440 for (i = 0; events[i]; i++) {
1441 event = events[i];
1442
1443 ret = register_ftrace_event(event);
1444 if (!ret) {
1445 printk(KERN_WARNING "event %d failed to register\n",
1446 event->type);
1447 WARN_ON_ONCE(1);
1448 }
1449 }
1450
1451 return 0;
1452 }
1453 early_initcall(init_events);
1454