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1/*
2 * trace_output.c
3 *
4 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
5 *
6 */
7
8#include <linux/module.h>
9#include <linux/mutex.h>
10#include <linux/ftrace.h>
11
12#include "trace_output.h"
13
14/* must be a power of 2 */
15#define EVENT_HASHSIZE 128
16
17DECLARE_RWSEM(trace_event_mutex);
18
19static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
20
21static int next_event_type = __TRACE_LAST_TYPE + 1;
22
23int trace_print_seq(struct seq_file *m, struct trace_seq *s)
24{
25 int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;
26 int ret;
27
28 ret = seq_write(m, s->buffer, len);
29
30 /*
31 * Only reset this buffer if we successfully wrote to the
32 * seq_file buffer.
33 */
34 if (!ret)
35 trace_seq_init(s);
36
37 return ret;
38}
39
40enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
41{
42 struct trace_seq *s = &iter->seq;
43 struct trace_entry *entry = iter->ent;
44 struct bprint_entry *field;
45 int ret;
46
47 trace_assign_type(field, entry);
48
49 ret = trace_seq_bprintf(s, field->fmt, field->buf);
50 if (!ret)
51 return TRACE_TYPE_PARTIAL_LINE;
52
53 return TRACE_TYPE_HANDLED;
54}
55
56enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
57{
58 struct trace_seq *s = &iter->seq;
59 struct trace_entry *entry = iter->ent;
60 struct print_entry *field;
61 int ret;
62
63 trace_assign_type(field, entry);
64
65 ret = trace_seq_printf(s, "%s", field->buf);
66 if (!ret)
67 return TRACE_TYPE_PARTIAL_LINE;
68
69 return TRACE_TYPE_HANDLED;
70}
71
72/**
73 * trace_seq_printf - sequence printing of trace information
74 * @s: trace sequence descriptor
75 * @fmt: printf format string
76 *
77 * It returns 0 if the trace oversizes the buffer's free
78 * space, 1 otherwise.
79 *
80 * The tracer may use either sequence operations or its own
81 * copy to user routines. To simplify formating of a trace
82 * trace_seq_printf is used to store strings into a special
83 * buffer (@s). Then the output may be either used by
84 * the sequencer or pulled into another buffer.
85 */
86int
87trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
88{
89 int len = (PAGE_SIZE - 1) - s->len;
90 va_list ap;
91 int ret;
92
93 if (s->full || !len)
94 return 0;
95
96 va_start(ap, fmt);
97 ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
98 va_end(ap);
99
100 /* If we can't write it all, don't bother writing anything */
101 if (ret >= len) {
102 s->full = 1;
103 return 0;
104 }
105
106 s->len += ret;
107
108 return 1;
109}
110EXPORT_SYMBOL_GPL(trace_seq_printf);
111
112/**
113 * trace_seq_vprintf - sequence printing of trace information
114 * @s: trace sequence descriptor
115 * @fmt: printf format string
116 *
117 * The tracer may use either sequence operations or its own
118 * copy to user routines. To simplify formating of a trace
119 * trace_seq_printf is used to store strings into a special
120 * buffer (@s). Then the output may be either used by
121 * the sequencer or pulled into another buffer.
122 */
123int
124trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
125{
126 int len = (PAGE_SIZE - 1) - s->len;
127 int ret;
128
129 if (s->full || !len)
130 return 0;
131
132 ret = vsnprintf(s->buffer + s->len, len, fmt, args);
133
134 /* If we can't write it all, don't bother writing anything */
135 if (ret >= len) {
136 s->full = 1;
137 return 0;
138 }
139
140 s->len += ret;
141
142 return len;
143}
144EXPORT_SYMBOL_GPL(trace_seq_vprintf);
145
146int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
147{
148 int len = (PAGE_SIZE - 1) - s->len;
149 int ret;
150
151 if (s->full || !len)
152 return 0;
153
154 ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
155
156 /* If we can't write it all, don't bother writing anything */
157 if (ret >= len) {
158 s->full = 1;
159 return 0;
160 }
161
162 s->len += ret;
163
164 return len;
165}
166
167/**
168 * trace_seq_puts - trace sequence printing of simple string
169 * @s: trace sequence descriptor
170 * @str: simple string to record
171 *
172 * The tracer may use either the sequence operations or its own
173 * copy to user routines. This function records a simple string
174 * into a special buffer (@s) for later retrieval by a sequencer
175 * or other mechanism.
176 */
177int trace_seq_puts(struct trace_seq *s, const char *str)
178{
179 int len = strlen(str);
180
181 if (s->full)
182 return 0;
183
184 if (len > ((PAGE_SIZE - 1) - s->len)) {
185 s->full = 1;
186 return 0;
187 }
188
189 memcpy(s->buffer + s->len, str, len);
190 s->len += len;
191
192 return len;
193}
194
195int trace_seq_putc(struct trace_seq *s, unsigned char c)
196{
197 if (s->full)
198 return 0;
199
200 if (s->len >= (PAGE_SIZE - 1)) {
201 s->full = 1;
202 return 0;
203 }
204
205 s->buffer[s->len++] = c;
206
207 return 1;
208}
209EXPORT_SYMBOL(trace_seq_putc);
210
211int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
212{
213 if (s->full)
214 return 0;
215
216 if (len > ((PAGE_SIZE - 1) - s->len)) {
217 s->full = 1;
218 return 0;
219 }
220
221 memcpy(s->buffer + s->len, mem, len);
222 s->len += len;
223
224 return len;
225}
226
227int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
228{
229 unsigned char hex[HEX_CHARS];
230 const unsigned char *data = mem;
231 int i, j;
232
233 if (s->full)
234 return 0;
235
236#ifdef __BIG_ENDIAN
237 for (i = 0, j = 0; i < len; i++) {
238#else
239 for (i = len-1, j = 0; i >= 0; i--) {
240#endif
241 hex[j++] = hex_asc_hi(data[i]);
242 hex[j++] = hex_asc_lo(data[i]);
243 }
244 hex[j++] = ' ';
245
246 return trace_seq_putmem(s, hex, j);
247}
248
249void *trace_seq_reserve(struct trace_seq *s, size_t len)
250{
251 void *ret;
252
253 if (s->full)
254 return NULL;
255
256 if (len > ((PAGE_SIZE - 1) - s->len)) {
257 s->full = 1;
258 return NULL;
259 }
260
261 ret = s->buffer + s->len;
262 s->len += len;
263
264 return ret;
265}
266
267int trace_seq_path(struct trace_seq *s, struct path *path)
268{
269 unsigned char *p;
270
271 if (s->full)
272 return 0;
273
274 if (s->len >= (PAGE_SIZE - 1)) {
275 s->full = 1;
276 return 0;
277 }
278
279 p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
280 if (!IS_ERR(p)) {
281 p = mangle_path(s->buffer + s->len, p, "\n");
282 if (p) {
283 s->len = p - s->buffer;
284 return 1;
285 }
286 } else {
287 s->buffer[s->len++] = '?';
288 return 1;
289 }
290
291 s->full = 1;
292 return 0;
293}
294
295const char *
296ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
297 unsigned long flags,
298 const struct trace_print_flags *flag_array)
299{
300 unsigned long mask;
301 const char *str;
302 const char *ret = p->buffer + p->len;
303 int i;
304
305 for (i = 0; flag_array[i].name && flags; i++) {
306
307 mask = flag_array[i].mask;
308 if ((flags & mask) != mask)
309 continue;
310
311 str = flag_array[i].name;
312 flags &= ~mask;
313 if (p->len && delim)
314 trace_seq_puts(p, delim);
315 trace_seq_puts(p, str);
316 }
317
318 /* check for left over flags */
319 if (flags) {
320 if (p->len && delim)
321 trace_seq_puts(p, delim);
322 trace_seq_printf(p, "0x%lx", flags);
323 }
324
325 trace_seq_putc(p, 0);
326
327 return ret;
328}
329EXPORT_SYMBOL(ftrace_print_flags_seq);
330
331const char *
332ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
333 const struct trace_print_flags *symbol_array)
334{
335 int i;
336 const char *ret = p->buffer + p->len;
337
338 for (i = 0; symbol_array[i].name; i++) {
339
340 if (val != symbol_array[i].mask)
341 continue;
342
343 trace_seq_puts(p, symbol_array[i].name);
344 break;
345 }
346
347 if (!p->len)
348 trace_seq_printf(p, "0x%lx", val);
349
350 trace_seq_putc(p, 0);
351
352 return ret;
353}
354EXPORT_SYMBOL(ftrace_print_symbols_seq);
355
356#if BITS_PER_LONG == 32
357const char *
358ftrace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
359 const struct trace_print_flags_u64 *symbol_array)
360{
361 int i;
362 const char *ret = p->buffer + p->len;
363
364 for (i = 0; symbol_array[i].name; i++) {
365
366 if (val != symbol_array[i].mask)
367 continue;
368
369 trace_seq_puts(p, symbol_array[i].name);
370 break;
371 }
372
373 if (!p->len)
374 trace_seq_printf(p, "0x%llx", val);
375
376 trace_seq_putc(p, 0);
377
378 return ret;
379}
380EXPORT_SYMBOL(ftrace_print_symbols_seq_u64);
381#endif
382
383const char *
384ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
385{
386 int i;
387 const char *ret = p->buffer + p->len;
388
389 for (i = 0; i < buf_len; i++)
390 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
391
392 trace_seq_putc(p, 0);
393
394 return ret;
395}
396EXPORT_SYMBOL(ftrace_print_hex_seq);
397
398#ifdef CONFIG_KRETPROBES
399static inline const char *kretprobed(const char *name)
400{
401 static const char tramp_name[] = "kretprobe_trampoline";
402 int size = sizeof(tramp_name);
403
404 if (strncmp(tramp_name, name, size) == 0)
405 return "[unknown/kretprobe'd]";
406 return name;
407}
408#else
409static inline const char *kretprobed(const char *name)
410{
411 return name;
412}
413#endif /* CONFIG_KRETPROBES */
414
415static int
416seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
417{
418#ifdef CONFIG_KALLSYMS
419 char str[KSYM_SYMBOL_LEN];
420 const char *name;
421
422 kallsyms_lookup(address, NULL, NULL, NULL, str);
423
424 name = kretprobed(str);
425
426 return trace_seq_printf(s, fmt, name);
427#endif
428 return 1;
429}
430
431static int
432seq_print_sym_offset(struct trace_seq *s, const char *fmt,
433 unsigned long address)
434{
435#ifdef CONFIG_KALLSYMS
436 char str[KSYM_SYMBOL_LEN];
437 const char *name;
438
439 sprint_symbol(str, address);
440 name = kretprobed(str);
441
442 return trace_seq_printf(s, fmt, name);
443#endif
444 return 1;
445}
446
447#ifndef CONFIG_64BIT
448# define IP_FMT "%08lx"
449#else
450# define IP_FMT "%016lx"
451#endif
452
453int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
454 unsigned long ip, unsigned long sym_flags)
455{
456 struct file *file = NULL;
457 unsigned long vmstart = 0;
458 int ret = 1;
459
460 if (s->full)
461 return 0;
462
463 if (mm) {
464 const struct vm_area_struct *vma;
465
466 down_read(&mm->mmap_sem);
467 vma = find_vma(mm, ip);
468 if (vma) {
469 file = vma->vm_file;
470 vmstart = vma->vm_start;
471 }
472 if (file) {
473 ret = trace_seq_path(s, &file->f_path);
474 if (ret)
475 ret = trace_seq_printf(s, "[+0x%lx]",
476 ip - vmstart);
477 }
478 up_read(&mm->mmap_sem);
479 }
480 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
481 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
482 return ret;
483}
484
485int
486seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
487 unsigned long sym_flags)
488{
489 struct mm_struct *mm = NULL;
490 int ret = 1;
491 unsigned int i;
492
493 if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
494 struct task_struct *task;
495 /*
496 * we do the lookup on the thread group leader,
497 * since individual threads might have already quit!
498 */
499 rcu_read_lock();
500 task = find_task_by_vpid(entry->tgid);
501 if (task)
502 mm = get_task_mm(task);
503 rcu_read_unlock();
504 }
505
506 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
507 unsigned long ip = entry->caller[i];
508
509 if (ip == ULONG_MAX || !ret)
510 break;
511 if (ret)
512 ret = trace_seq_puts(s, " => ");
513 if (!ip) {
514 if (ret)
515 ret = trace_seq_puts(s, "??");
516 if (ret)
517 ret = trace_seq_puts(s, "\n");
518 continue;
519 }
520 if (!ret)
521 break;
522 if (ret)
523 ret = seq_print_user_ip(s, mm, ip, sym_flags);
524 ret = trace_seq_puts(s, "\n");
525 }
526
527 if (mm)
528 mmput(mm);
529 return ret;
530}
531
532int
533seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
534{
535 int ret;
536
537 if (!ip)
538 return trace_seq_printf(s, "0");
539
540 if (sym_flags & TRACE_ITER_SYM_OFFSET)
541 ret = seq_print_sym_offset(s, "%s", ip);
542 else
543 ret = seq_print_sym_short(s, "%s", ip);
544
545 if (!ret)
546 return 0;
547
548 if (sym_flags & TRACE_ITER_SYM_ADDR)
549 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
550 return ret;
551}
552
553/**
554 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
555 * @s: trace seq struct to write to
556 * @entry: The trace entry field from the ring buffer
557 *
558 * Prints the generic fields of irqs off, in hard or softirq, preempt
559 * count.
560 */
561int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
562{
563 char hardsoft_irq;
564 char need_resched;
565 char irqs_off;
566 int hardirq;
567 int softirq;
568 int ret;
569
570 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
571 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
572
573 irqs_off =
574 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
575 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
576 '.';
577 need_resched =
578 (entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.';
579 hardsoft_irq =
580 (hardirq && softirq) ? 'H' :
581 hardirq ? 'h' :
582 softirq ? 's' :
583 '.';
584
585 if (!trace_seq_printf(s, "%c%c%c",
586 irqs_off, need_resched, hardsoft_irq))
587 return 0;
588
589 if (entry->preempt_count)
590 ret = trace_seq_printf(s, "%x", entry->preempt_count);
591 else
592 ret = trace_seq_putc(s, '.');
593
594 return ret;
595}
596
597static int
598lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
599{
600 char comm[TASK_COMM_LEN];
601
602 trace_find_cmdline(entry->pid, comm);
603
604 if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
605 comm, entry->pid, cpu))
606 return 0;
607
608 return trace_print_lat_fmt(s, entry);
609}
610
611static unsigned long preempt_mark_thresh = 100;
612
613static int
614lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
615 unsigned long rel_usecs)
616{
617 return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
618 rel_usecs > preempt_mark_thresh ? '!' :
619 rel_usecs > 1 ? '+' : ' ');
620}
621
622int trace_print_context(struct trace_iterator *iter)
623{
624 struct trace_seq *s = &iter->seq;
625 struct trace_entry *entry = iter->ent;
626 unsigned long long t = ns2usecs(iter->ts);
627 unsigned long usec_rem = do_div(t, USEC_PER_SEC);
628 unsigned long secs = (unsigned long)t;
629 char comm[TASK_COMM_LEN];
630
631 trace_find_cmdline(entry->pid, comm);
632
633 return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
634 comm, entry->pid, iter->cpu, secs, usec_rem);
635}
636
637int trace_print_lat_context(struct trace_iterator *iter)
638{
639 u64 next_ts;
640 int ret;
641 struct trace_seq *s = &iter->seq;
642 struct trace_entry *entry = iter->ent,
643 *next_entry = trace_find_next_entry(iter, NULL,
644 &next_ts);
645 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
646 unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
647 unsigned long rel_usecs;
648
649 if (!next_entry)
650 next_ts = iter->ts;
651 rel_usecs = ns2usecs(next_ts - iter->ts);
652
653 if (verbose) {
654 char comm[TASK_COMM_LEN];
655
656 trace_find_cmdline(entry->pid, comm);
657
658 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
659 " %ld.%03ldms (+%ld.%03ldms): ", comm,
660 entry->pid, iter->cpu, entry->flags,
661 entry->preempt_count, iter->idx,
662 ns2usecs(iter->ts),
663 abs_usecs / USEC_PER_MSEC,
664 abs_usecs % USEC_PER_MSEC,
665 rel_usecs / USEC_PER_MSEC,
666 rel_usecs % USEC_PER_MSEC);
667 } else {
668 ret = lat_print_generic(s, entry, iter->cpu);
669 if (ret)
670 ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
671 }
672
673 return ret;
674}
675
676static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
677
678static int task_state_char(unsigned long state)
679{
680 int bit = state ? __ffs(state) + 1 : 0;
681
682 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
683}
684
685/**
686 * ftrace_find_event - find a registered event
687 * @type: the type of event to look for
688 *
689 * Returns an event of type @type otherwise NULL
690 * Called with trace_event_read_lock() held.
691 */
692struct trace_event *ftrace_find_event(int type)
693{
694 struct trace_event *event;
695 struct hlist_node *n;
696 unsigned key;
697
698 key = type & (EVENT_HASHSIZE - 1);
699
700 hlist_for_each_entry(event, n, &event_hash[key], node) {
701 if (event->type == type)
702 return event;
703 }
704
705 return NULL;
706}
707
708static LIST_HEAD(ftrace_event_list);
709
710static int trace_search_list(struct list_head **list)
711{
712 struct trace_event *e;
713 int last = __TRACE_LAST_TYPE;
714
715 if (list_empty(&ftrace_event_list)) {
716 *list = &ftrace_event_list;
717 return last + 1;
718 }
719
720 /*
721 * We used up all possible max events,
722 * lets see if somebody freed one.
723 */
724 list_for_each_entry(e, &ftrace_event_list, list) {
725 if (e->type != last + 1)
726 break;
727 last++;
728 }
729
730 /* Did we used up all 65 thousand events??? */
731 if ((last + 1) > FTRACE_MAX_EVENT)
732 return 0;
733
734 *list = &e->list;
735 return last + 1;
736}
737
738void trace_event_read_lock(void)
739{
740 down_read(&trace_event_mutex);
741}
742
743void trace_event_read_unlock(void)
744{
745 up_read(&trace_event_mutex);
746}
747
748/**
749 * register_ftrace_event - register output for an event type
750 * @event: the event type to register
751 *
752 * Event types are stored in a hash and this hash is used to
753 * find a way to print an event. If the @event->type is set
754 * then it will use that type, otherwise it will assign a
755 * type to use.
756 *
757 * If you assign your own type, please make sure it is added
758 * to the trace_type enum in trace.h, to avoid collisions
759 * with the dynamic types.
760 *
761 * Returns the event type number or zero on error.
762 */
763int register_ftrace_event(struct trace_event *event)
764{
765 unsigned key;
766 int ret = 0;
767
768 down_write(&trace_event_mutex);
769
770 if (WARN_ON(!event))
771 goto out;
772
773 if (WARN_ON(!event->funcs))
774 goto out;
775
776 INIT_LIST_HEAD(&event->list);
777
778 if (!event->type) {
779 struct list_head *list = NULL;
780
781 if (next_event_type > FTRACE_MAX_EVENT) {
782
783 event->type = trace_search_list(&list);
784 if (!event->type)
785 goto out;
786
787 } else {
788
789 event->type = next_event_type++;
790 list = &ftrace_event_list;
791 }
792
793 if (WARN_ON(ftrace_find_event(event->type)))
794 goto out;
795
796 list_add_tail(&event->list, list);
797
798 } else if (event->type > __TRACE_LAST_TYPE) {
799 printk(KERN_WARNING "Need to add type to trace.h\n");
800 WARN_ON(1);
801 goto out;
802 } else {
803 /* Is this event already used */
804 if (ftrace_find_event(event->type))
805 goto out;
806 }
807
808 if (event->funcs->trace == NULL)
809 event->funcs->trace = trace_nop_print;
810 if (event->funcs->raw == NULL)
811 event->funcs->raw = trace_nop_print;
812 if (event->funcs->hex == NULL)
813 event->funcs->hex = trace_nop_print;
814 if (event->funcs->binary == NULL)
815 event->funcs->binary = trace_nop_print;
816
817 key = event->type & (EVENT_HASHSIZE - 1);
818
819 hlist_add_head(&event->node, &event_hash[key]);
820
821 ret = event->type;
822 out:
823 up_write(&trace_event_mutex);
824
825 return ret;
826}
827EXPORT_SYMBOL_GPL(register_ftrace_event);
828
829/*
830 * Used by module code with the trace_event_mutex held for write.
831 */
832int __unregister_ftrace_event(struct trace_event *event)
833{
834 hlist_del(&event->node);
835 list_del(&event->list);
836 return 0;
837}
838
839/**
840 * unregister_ftrace_event - remove a no longer used event
841 * @event: the event to remove
842 */
843int unregister_ftrace_event(struct trace_event *event)
844{
845 down_write(&trace_event_mutex);
846 __unregister_ftrace_event(event);
847 up_write(&trace_event_mutex);
848
849 return 0;
850}
851EXPORT_SYMBOL_GPL(unregister_ftrace_event);
852
853/*
854 * Standard events
855 */
856
857enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
858 struct trace_event *event)
859{
860 if (!trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type))
861 return TRACE_TYPE_PARTIAL_LINE;
862
863 return TRACE_TYPE_HANDLED;
864}
865
866/* TRACE_FN */
867static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
868 struct trace_event *event)
869{
870 struct ftrace_entry *field;
871 struct trace_seq *s = &iter->seq;
872
873 trace_assign_type(field, iter->ent);
874
875 if (!seq_print_ip_sym(s, field->ip, flags))
876 goto partial;
877
878 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
879 if (!trace_seq_printf(s, " <-"))
880 goto partial;
881 if (!seq_print_ip_sym(s,
882 field->parent_ip,
883 flags))
884 goto partial;
885 }
886 if (!trace_seq_printf(s, "\n"))
887 goto partial;
888
889 return TRACE_TYPE_HANDLED;
890
891 partial:
892 return TRACE_TYPE_PARTIAL_LINE;
893}
894
895static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
896 struct trace_event *event)
897{
898 struct ftrace_entry *field;
899
900 trace_assign_type(field, iter->ent);
901
902 if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
903 field->ip,
904 field->parent_ip))
905 return TRACE_TYPE_PARTIAL_LINE;
906
907 return TRACE_TYPE_HANDLED;
908}
909
910static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
911 struct trace_event *event)
912{
913 struct ftrace_entry *field;
914 struct trace_seq *s = &iter->seq;
915
916 trace_assign_type(field, iter->ent);
917
918 SEQ_PUT_HEX_FIELD_RET(s, field->ip);
919 SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
920
921 return TRACE_TYPE_HANDLED;
922}
923
924static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
925 struct trace_event *event)
926{
927 struct ftrace_entry *field;
928 struct trace_seq *s = &iter->seq;
929
930 trace_assign_type(field, iter->ent);
931
932 SEQ_PUT_FIELD_RET(s, field->ip);
933 SEQ_PUT_FIELD_RET(s, field->parent_ip);
934
935 return TRACE_TYPE_HANDLED;
936}
937
938static struct trace_event_functions trace_fn_funcs = {
939 .trace = trace_fn_trace,
940 .raw = trace_fn_raw,
941 .hex = trace_fn_hex,
942 .binary = trace_fn_bin,
943};
944
945static struct trace_event trace_fn_event = {
946 .type = TRACE_FN,
947 .funcs = &trace_fn_funcs,
948};
949
950/* TRACE_CTX an TRACE_WAKE */
951static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
952 char *delim)
953{
954 struct ctx_switch_entry *field;
955 char comm[TASK_COMM_LEN];
956 int S, T;
957
958
959 trace_assign_type(field, iter->ent);
960
961 T = task_state_char(field->next_state);
962 S = task_state_char(field->prev_state);
963 trace_find_cmdline(field->next_pid, comm);
964 if (!trace_seq_printf(&iter->seq,
965 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
966 field->prev_pid,
967 field->prev_prio,
968 S, delim,
969 field->next_cpu,
970 field->next_pid,
971 field->next_prio,
972 T, comm))
973 return TRACE_TYPE_PARTIAL_LINE;
974
975 return TRACE_TYPE_HANDLED;
976}
977
978static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
979 struct trace_event *event)
980{
981 return trace_ctxwake_print(iter, "==>");
982}
983
984static enum print_line_t trace_wake_print(struct trace_iterator *iter,
985 int flags, struct trace_event *event)
986{
987 return trace_ctxwake_print(iter, " +");
988}
989
990static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
991{
992 struct ctx_switch_entry *field;
993 int T;
994
995 trace_assign_type(field, iter->ent);
996
997 if (!S)
998 S = task_state_char(field->prev_state);
999 T = task_state_char(field->next_state);
1000 if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
1001 field->prev_pid,
1002 field->prev_prio,
1003 S,
1004 field->next_cpu,
1005 field->next_pid,
1006 field->next_prio,
1007 T))
1008 return TRACE_TYPE_PARTIAL_LINE;
1009
1010 return TRACE_TYPE_HANDLED;
1011}
1012
1013static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
1014 struct trace_event *event)
1015{
1016 return trace_ctxwake_raw(iter, 0);
1017}
1018
1019static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
1020 struct trace_event *event)
1021{
1022 return trace_ctxwake_raw(iter, '+');
1023}
1024
1025
1026static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
1027{
1028 struct ctx_switch_entry *field;
1029 struct trace_seq *s = &iter->seq;
1030 int T;
1031
1032 trace_assign_type(field, iter->ent);
1033
1034 if (!S)
1035 S = task_state_char(field->prev_state);
1036 T = task_state_char(field->next_state);
1037
1038 SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
1039 SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
1040 SEQ_PUT_HEX_FIELD_RET(s, S);
1041 SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
1042 SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
1043 SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
1044 SEQ_PUT_HEX_FIELD_RET(s, T);
1045
1046 return TRACE_TYPE_HANDLED;
1047}
1048
1049static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1050 struct trace_event *event)
1051{
1052 return trace_ctxwake_hex(iter, 0);
1053}
1054
1055static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1056 struct trace_event *event)
1057{
1058 return trace_ctxwake_hex(iter, '+');
1059}
1060
1061static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1062 int flags, struct trace_event *event)
1063{
1064 struct ctx_switch_entry *field;
1065 struct trace_seq *s = &iter->seq;
1066
1067 trace_assign_type(field, iter->ent);
1068
1069 SEQ_PUT_FIELD_RET(s, field->prev_pid);
1070 SEQ_PUT_FIELD_RET(s, field->prev_prio);
1071 SEQ_PUT_FIELD_RET(s, field->prev_state);
1072 SEQ_PUT_FIELD_RET(s, field->next_pid);
1073 SEQ_PUT_FIELD_RET(s, field->next_prio);
1074 SEQ_PUT_FIELD_RET(s, field->next_state);
1075
1076 return TRACE_TYPE_HANDLED;
1077}
1078
1079static struct trace_event_functions trace_ctx_funcs = {
1080 .trace = trace_ctx_print,
1081 .raw = trace_ctx_raw,
1082 .hex = trace_ctx_hex,
1083 .binary = trace_ctxwake_bin,
1084};
1085
1086static struct trace_event trace_ctx_event = {
1087 .type = TRACE_CTX,
1088 .funcs = &trace_ctx_funcs,
1089};
1090
1091static struct trace_event_functions trace_wake_funcs = {
1092 .trace = trace_wake_print,
1093 .raw = trace_wake_raw,
1094 .hex = trace_wake_hex,
1095 .binary = trace_ctxwake_bin,
1096};
1097
1098static struct trace_event trace_wake_event = {
1099 .type = TRACE_WAKE,
1100 .funcs = &trace_wake_funcs,
1101};
1102
1103/* TRACE_STACK */
1104
1105static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1106 int flags, struct trace_event *event)
1107{
1108 struct stack_entry *field;
1109 struct trace_seq *s = &iter->seq;
1110 unsigned long *p;
1111 unsigned long *end;
1112
1113 trace_assign_type(field, iter->ent);
1114 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1115
1116 if (!trace_seq_puts(s, "<stack trace>\n"))
1117 goto partial;
1118
1119 for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1120 if (!trace_seq_puts(s, " => "))
1121 goto partial;
1122
1123 if (!seq_print_ip_sym(s, *p, flags))
1124 goto partial;
1125 if (!trace_seq_puts(s, "\n"))
1126 goto partial;
1127 }
1128
1129 return TRACE_TYPE_HANDLED;
1130
1131 partial:
1132 return TRACE_TYPE_PARTIAL_LINE;
1133}
1134
1135static struct trace_event_functions trace_stack_funcs = {
1136 .trace = trace_stack_print,
1137};
1138
1139static struct trace_event trace_stack_event = {
1140 .type = TRACE_STACK,
1141 .funcs = &trace_stack_funcs,
1142};
1143
1144/* TRACE_USER_STACK */
1145static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1146 int flags, struct trace_event *event)
1147{
1148 struct userstack_entry *field;
1149 struct trace_seq *s = &iter->seq;
1150
1151 trace_assign_type(field, iter->ent);
1152
1153 if (!trace_seq_puts(s, "<user stack trace>\n"))
1154 goto partial;
1155
1156 if (!seq_print_userip_objs(field, s, flags))
1157 goto partial;
1158
1159 return TRACE_TYPE_HANDLED;
1160
1161 partial:
1162 return TRACE_TYPE_PARTIAL_LINE;
1163}
1164
1165static struct trace_event_functions trace_user_stack_funcs = {
1166 .trace = trace_user_stack_print,
1167};
1168
1169static struct trace_event trace_user_stack_event = {
1170 .type = TRACE_USER_STACK,
1171 .funcs = &trace_user_stack_funcs,
1172};
1173
1174/* TRACE_BPRINT */
1175static enum print_line_t
1176trace_bprint_print(struct trace_iterator *iter, int flags,
1177 struct trace_event *event)
1178{
1179 struct trace_entry *entry = iter->ent;
1180 struct trace_seq *s = &iter->seq;
1181 struct bprint_entry *field;
1182
1183 trace_assign_type(field, entry);
1184
1185 if (!seq_print_ip_sym(s, field->ip, flags))
1186 goto partial;
1187
1188 if (!trace_seq_puts(s, ": "))
1189 goto partial;
1190
1191 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1192 goto partial;
1193
1194 return TRACE_TYPE_HANDLED;
1195
1196 partial:
1197 return TRACE_TYPE_PARTIAL_LINE;
1198}
1199
1200
1201static enum print_line_t
1202trace_bprint_raw(struct trace_iterator *iter, int flags,
1203 struct trace_event *event)
1204{
1205 struct bprint_entry *field;
1206 struct trace_seq *s = &iter->seq;
1207
1208 trace_assign_type(field, iter->ent);
1209
1210 if (!trace_seq_printf(s, ": %lx : ", field->ip))
1211 goto partial;
1212
1213 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1214 goto partial;
1215
1216 return TRACE_TYPE_HANDLED;
1217
1218 partial:
1219 return TRACE_TYPE_PARTIAL_LINE;
1220}
1221
1222static struct trace_event_functions trace_bprint_funcs = {
1223 .trace = trace_bprint_print,
1224 .raw = trace_bprint_raw,
1225};
1226
1227static struct trace_event trace_bprint_event = {
1228 .type = TRACE_BPRINT,
1229 .funcs = &trace_bprint_funcs,
1230};
1231
1232/* TRACE_PRINT */
1233static enum print_line_t trace_print_print(struct trace_iterator *iter,
1234 int flags, struct trace_event *event)
1235{
1236 struct print_entry *field;
1237 struct trace_seq *s = &iter->seq;
1238
1239 trace_assign_type(field, iter->ent);
1240
1241 if (!seq_print_ip_sym(s, field->ip, flags))
1242 goto partial;
1243
1244 if (!trace_seq_printf(s, ": %s", field->buf))
1245 goto partial;
1246
1247 return TRACE_TYPE_HANDLED;
1248
1249 partial:
1250 return TRACE_TYPE_PARTIAL_LINE;
1251}
1252
1253static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1254 struct trace_event *event)
1255{
1256 struct print_entry *field;
1257
1258 trace_assign_type(field, iter->ent);
1259
1260 if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1261 goto partial;
1262
1263 return TRACE_TYPE_HANDLED;
1264
1265 partial:
1266 return TRACE_TYPE_PARTIAL_LINE;
1267}
1268
1269static struct trace_event_functions trace_print_funcs = {
1270 .trace = trace_print_print,
1271 .raw = trace_print_raw,
1272};
1273
1274static struct trace_event trace_print_event = {
1275 .type = TRACE_PRINT,
1276 .funcs = &trace_print_funcs,
1277};
1278
1279
1280static struct trace_event *events[] __initdata = {
1281 &trace_fn_event,
1282 &trace_ctx_event,
1283 &trace_wake_event,
1284 &trace_stack_event,
1285 &trace_user_stack_event,
1286 &trace_bprint_event,
1287 &trace_print_event,
1288 NULL
1289};
1290
1291__init static int init_events(void)
1292{
1293 struct trace_event *event;
1294 int i, ret;
1295
1296 for (i = 0; events[i]; i++) {
1297 event = events[i];
1298
1299 ret = register_ftrace_event(event);
1300 if (!ret) {
1301 printk(KERN_WARNING "event %d failed to register\n",
1302 event->type);
1303 WARN_ON_ONCE(1);
1304 }
1305 }
1306
1307 return 0;
1308}
1309device_initcall(init_events);
1/*
2 * trace_output.c
3 *
4 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
5 *
6 */
7
8#include <linux/module.h>
9#include <linux/mutex.h>
10#include <linux/ftrace.h>
11
12#include "trace_output.h"
13
14/* must be a power of 2 */
15#define EVENT_HASHSIZE 128
16
17DECLARE_RWSEM(trace_event_mutex);
18
19static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
20
21static int next_event_type = __TRACE_LAST_TYPE + 1;
22
23int trace_print_seq(struct seq_file *m, struct trace_seq *s)
24{
25 int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;
26 int ret;
27
28 ret = seq_write(m, s->buffer, len);
29
30 /*
31 * Only reset this buffer if we successfully wrote to the
32 * seq_file buffer.
33 */
34 if (!ret)
35 trace_seq_init(s);
36
37 return ret;
38}
39
40enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
41{
42 struct trace_seq *s = &iter->seq;
43 struct trace_entry *entry = iter->ent;
44 struct bprint_entry *field;
45 int ret;
46
47 trace_assign_type(field, entry);
48
49 ret = trace_seq_bprintf(s, field->fmt, field->buf);
50 if (!ret)
51 return TRACE_TYPE_PARTIAL_LINE;
52
53 return TRACE_TYPE_HANDLED;
54}
55
56enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
57{
58 struct trace_seq *s = &iter->seq;
59 struct trace_entry *entry = iter->ent;
60 struct print_entry *field;
61 int ret;
62
63 trace_assign_type(field, entry);
64
65 ret = trace_seq_printf(s, "%s", field->buf);
66 if (!ret)
67 return TRACE_TYPE_PARTIAL_LINE;
68
69 return TRACE_TYPE_HANDLED;
70}
71
72/**
73 * trace_seq_printf - sequence printing of trace information
74 * @s: trace sequence descriptor
75 * @fmt: printf format string
76 *
77 * It returns 0 if the trace oversizes the buffer's free
78 * space, 1 otherwise.
79 *
80 * The tracer may use either sequence operations or its own
81 * copy to user routines. To simplify formating of a trace
82 * trace_seq_printf is used to store strings into a special
83 * buffer (@s). Then the output may be either used by
84 * the sequencer or pulled into another buffer.
85 */
86int
87trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
88{
89 int len = (PAGE_SIZE - 1) - s->len;
90 va_list ap;
91 int ret;
92
93 if (s->full || !len)
94 return 0;
95
96 va_start(ap, fmt);
97 ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
98 va_end(ap);
99
100 /* If we can't write it all, don't bother writing anything */
101 if (ret >= len) {
102 s->full = 1;
103 return 0;
104 }
105
106 s->len += ret;
107
108 return 1;
109}
110EXPORT_SYMBOL_GPL(trace_seq_printf);
111
112/**
113 * trace_seq_vprintf - sequence printing of trace information
114 * @s: trace sequence descriptor
115 * @fmt: printf format string
116 *
117 * The tracer may use either sequence operations or its own
118 * copy to user routines. To simplify formating of a trace
119 * trace_seq_printf is used to store strings into a special
120 * buffer (@s). Then the output may be either used by
121 * the sequencer or pulled into another buffer.
122 */
123int
124trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
125{
126 int len = (PAGE_SIZE - 1) - s->len;
127 int ret;
128
129 if (s->full || !len)
130 return 0;
131
132 ret = vsnprintf(s->buffer + s->len, len, fmt, args);
133
134 /* If we can't write it all, don't bother writing anything */
135 if (ret >= len) {
136 s->full = 1;
137 return 0;
138 }
139
140 s->len += ret;
141
142 return len;
143}
144EXPORT_SYMBOL_GPL(trace_seq_vprintf);
145
146int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
147{
148 int len = (PAGE_SIZE - 1) - s->len;
149 int ret;
150
151 if (s->full || !len)
152 return 0;
153
154 ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
155
156 /* If we can't write it all, don't bother writing anything */
157 if (ret >= len) {
158 s->full = 1;
159 return 0;
160 }
161
162 s->len += ret;
163
164 return len;
165}
166
167/**
168 * trace_seq_puts - trace sequence printing of simple string
169 * @s: trace sequence descriptor
170 * @str: simple string to record
171 *
172 * The tracer may use either the sequence operations or its own
173 * copy to user routines. This function records a simple string
174 * into a special buffer (@s) for later retrieval by a sequencer
175 * or other mechanism.
176 */
177int trace_seq_puts(struct trace_seq *s, const char *str)
178{
179 int len = strlen(str);
180
181 if (s->full)
182 return 0;
183
184 if (len > ((PAGE_SIZE - 1) - s->len)) {
185 s->full = 1;
186 return 0;
187 }
188
189 memcpy(s->buffer + s->len, str, len);
190 s->len += len;
191
192 return len;
193}
194
195int trace_seq_putc(struct trace_seq *s, unsigned char c)
196{
197 if (s->full)
198 return 0;
199
200 if (s->len >= (PAGE_SIZE - 1)) {
201 s->full = 1;
202 return 0;
203 }
204
205 s->buffer[s->len++] = c;
206
207 return 1;
208}
209EXPORT_SYMBOL(trace_seq_putc);
210
211int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
212{
213 if (s->full)
214 return 0;
215
216 if (len > ((PAGE_SIZE - 1) - s->len)) {
217 s->full = 1;
218 return 0;
219 }
220
221 memcpy(s->buffer + s->len, mem, len);
222 s->len += len;
223
224 return len;
225}
226
227int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
228{
229 unsigned char hex[HEX_CHARS];
230 const unsigned char *data = mem;
231 int i, j;
232
233 if (s->full)
234 return 0;
235
236#ifdef __BIG_ENDIAN
237 for (i = 0, j = 0; i < len; i++) {
238#else
239 for (i = len-1, j = 0; i >= 0; i--) {
240#endif
241 hex[j++] = hex_asc_hi(data[i]);
242 hex[j++] = hex_asc_lo(data[i]);
243 }
244 hex[j++] = ' ';
245
246 return trace_seq_putmem(s, hex, j);
247}
248
249void *trace_seq_reserve(struct trace_seq *s, size_t len)
250{
251 void *ret;
252
253 if (s->full)
254 return NULL;
255
256 if (len > ((PAGE_SIZE - 1) - s->len)) {
257 s->full = 1;
258 return NULL;
259 }
260
261 ret = s->buffer + s->len;
262 s->len += len;
263
264 return ret;
265}
266
267int trace_seq_path(struct trace_seq *s, const struct path *path)
268{
269 unsigned char *p;
270
271 if (s->full)
272 return 0;
273
274 if (s->len >= (PAGE_SIZE - 1)) {
275 s->full = 1;
276 return 0;
277 }
278
279 p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
280 if (!IS_ERR(p)) {
281 p = mangle_path(s->buffer + s->len, p, "\n");
282 if (p) {
283 s->len = p - s->buffer;
284 return 1;
285 }
286 } else {
287 s->buffer[s->len++] = '?';
288 return 1;
289 }
290
291 s->full = 1;
292 return 0;
293}
294
295const char *
296ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
297 unsigned long flags,
298 const struct trace_print_flags *flag_array)
299{
300 unsigned long mask;
301 const char *str;
302 const char *ret = p->buffer + p->len;
303 int i, first = 1;
304
305 for (i = 0; flag_array[i].name && flags; i++) {
306
307 mask = flag_array[i].mask;
308 if ((flags & mask) != mask)
309 continue;
310
311 str = flag_array[i].name;
312 flags &= ~mask;
313 if (!first && delim)
314 trace_seq_puts(p, delim);
315 else
316 first = 0;
317 trace_seq_puts(p, str);
318 }
319
320 /* check for left over flags */
321 if (flags) {
322 if (!first && delim)
323 trace_seq_puts(p, delim);
324 trace_seq_printf(p, "0x%lx", flags);
325 }
326
327 trace_seq_putc(p, 0);
328
329 return ret;
330}
331EXPORT_SYMBOL(ftrace_print_flags_seq);
332
333const char *
334ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
335 const struct trace_print_flags *symbol_array)
336{
337 int i;
338 const char *ret = p->buffer + p->len;
339
340 for (i = 0; symbol_array[i].name; i++) {
341
342 if (val != symbol_array[i].mask)
343 continue;
344
345 trace_seq_puts(p, symbol_array[i].name);
346 break;
347 }
348
349 if (ret == (const char *)(p->buffer + p->len))
350 trace_seq_printf(p, "0x%lx", val);
351
352 trace_seq_putc(p, 0);
353
354 return ret;
355}
356EXPORT_SYMBOL(ftrace_print_symbols_seq);
357
358#if BITS_PER_LONG == 32
359const char *
360ftrace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
361 const struct trace_print_flags_u64 *symbol_array)
362{
363 int i;
364 const char *ret = p->buffer + p->len;
365
366 for (i = 0; symbol_array[i].name; i++) {
367
368 if (val != symbol_array[i].mask)
369 continue;
370
371 trace_seq_puts(p, symbol_array[i].name);
372 break;
373 }
374
375 if (ret == (const char *)(p->buffer + p->len))
376 trace_seq_printf(p, "0x%llx", val);
377
378 trace_seq_putc(p, 0);
379
380 return ret;
381}
382EXPORT_SYMBOL(ftrace_print_symbols_seq_u64);
383#endif
384
385const char *
386ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
387{
388 int i;
389 const char *ret = p->buffer + p->len;
390
391 for (i = 0; i < buf_len; i++)
392 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
393
394 trace_seq_putc(p, 0);
395
396 return ret;
397}
398EXPORT_SYMBOL(ftrace_print_hex_seq);
399
400#ifdef CONFIG_KRETPROBES
401static inline const char *kretprobed(const char *name)
402{
403 static const char tramp_name[] = "kretprobe_trampoline";
404 int size = sizeof(tramp_name);
405
406 if (strncmp(tramp_name, name, size) == 0)
407 return "[unknown/kretprobe'd]";
408 return name;
409}
410#else
411static inline const char *kretprobed(const char *name)
412{
413 return name;
414}
415#endif /* CONFIG_KRETPROBES */
416
417static int
418seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
419{
420#ifdef CONFIG_KALLSYMS
421 char str[KSYM_SYMBOL_LEN];
422 const char *name;
423
424 kallsyms_lookup(address, NULL, NULL, NULL, str);
425
426 name = kretprobed(str);
427
428 return trace_seq_printf(s, fmt, name);
429#endif
430 return 1;
431}
432
433static int
434seq_print_sym_offset(struct trace_seq *s, const char *fmt,
435 unsigned long address)
436{
437#ifdef CONFIG_KALLSYMS
438 char str[KSYM_SYMBOL_LEN];
439 const char *name;
440
441 sprint_symbol(str, address);
442 name = kretprobed(str);
443
444 return trace_seq_printf(s, fmt, name);
445#endif
446 return 1;
447}
448
449#ifndef CONFIG_64BIT
450# define IP_FMT "%08lx"
451#else
452# define IP_FMT "%016lx"
453#endif
454
455int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
456 unsigned long ip, unsigned long sym_flags)
457{
458 struct file *file = NULL;
459 unsigned long vmstart = 0;
460 int ret = 1;
461
462 if (s->full)
463 return 0;
464
465 if (mm) {
466 const struct vm_area_struct *vma;
467
468 down_read(&mm->mmap_sem);
469 vma = find_vma(mm, ip);
470 if (vma) {
471 file = vma->vm_file;
472 vmstart = vma->vm_start;
473 }
474 if (file) {
475 ret = trace_seq_path(s, &file->f_path);
476 if (ret)
477 ret = trace_seq_printf(s, "[+0x%lx]",
478 ip - vmstart);
479 }
480 up_read(&mm->mmap_sem);
481 }
482 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
483 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
484 return ret;
485}
486
487int
488seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
489 unsigned long sym_flags)
490{
491 struct mm_struct *mm = NULL;
492 int ret = 1;
493 unsigned int i;
494
495 if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
496 struct task_struct *task;
497 /*
498 * we do the lookup on the thread group leader,
499 * since individual threads might have already quit!
500 */
501 rcu_read_lock();
502 task = find_task_by_vpid(entry->tgid);
503 if (task)
504 mm = get_task_mm(task);
505 rcu_read_unlock();
506 }
507
508 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
509 unsigned long ip = entry->caller[i];
510
511 if (ip == ULONG_MAX || !ret)
512 break;
513 if (ret)
514 ret = trace_seq_puts(s, " => ");
515 if (!ip) {
516 if (ret)
517 ret = trace_seq_puts(s, "??");
518 if (ret)
519 ret = trace_seq_puts(s, "\n");
520 continue;
521 }
522 if (!ret)
523 break;
524 if (ret)
525 ret = seq_print_user_ip(s, mm, ip, sym_flags);
526 ret = trace_seq_puts(s, "\n");
527 }
528
529 if (mm)
530 mmput(mm);
531 return ret;
532}
533
534int
535seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
536{
537 int ret;
538
539 if (!ip)
540 return trace_seq_printf(s, "0");
541
542 if (sym_flags & TRACE_ITER_SYM_OFFSET)
543 ret = seq_print_sym_offset(s, "%s", ip);
544 else
545 ret = seq_print_sym_short(s, "%s", ip);
546
547 if (!ret)
548 return 0;
549
550 if (sym_flags & TRACE_ITER_SYM_ADDR)
551 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
552 return ret;
553}
554
555/**
556 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
557 * @s: trace seq struct to write to
558 * @entry: The trace entry field from the ring buffer
559 *
560 * Prints the generic fields of irqs off, in hard or softirq, preempt
561 * count.
562 */
563int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
564{
565 char hardsoft_irq;
566 char need_resched;
567 char irqs_off;
568 int hardirq;
569 int softirq;
570 int ret;
571
572 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
573 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
574
575 irqs_off =
576 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
577 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
578 '.';
579 need_resched =
580 (entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.';
581 hardsoft_irq =
582 (hardirq && softirq) ? 'H' :
583 hardirq ? 'h' :
584 softirq ? 's' :
585 '.';
586
587 if (!trace_seq_printf(s, "%c%c%c",
588 irqs_off, need_resched, hardsoft_irq))
589 return 0;
590
591 if (entry->preempt_count)
592 ret = trace_seq_printf(s, "%x", entry->preempt_count);
593 else
594 ret = trace_seq_putc(s, '.');
595
596 return ret;
597}
598
599static int
600lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
601{
602 char comm[TASK_COMM_LEN];
603
604 trace_find_cmdline(entry->pid, comm);
605
606 if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
607 comm, entry->pid, cpu))
608 return 0;
609
610 return trace_print_lat_fmt(s, entry);
611}
612
613static unsigned long preempt_mark_thresh = 100;
614
615static int
616lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
617 unsigned long rel_usecs)
618{
619 return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
620 rel_usecs > preempt_mark_thresh ? '!' :
621 rel_usecs > 1 ? '+' : ' ');
622}
623
624int trace_print_context(struct trace_iterator *iter)
625{
626 struct trace_seq *s = &iter->seq;
627 struct trace_entry *entry = iter->ent;
628 unsigned long long t = ns2usecs(iter->ts);
629 unsigned long usec_rem = do_div(t, USEC_PER_SEC);
630 unsigned long secs = (unsigned long)t;
631 char comm[TASK_COMM_LEN];
632 int ret;
633
634 trace_find_cmdline(entry->pid, comm);
635
636 ret = trace_seq_printf(s, "%16s-%-5d [%03d] ",
637 comm, entry->pid, iter->cpu);
638 if (!ret)
639 return 0;
640
641 if (trace_flags & TRACE_ITER_IRQ_INFO) {
642 ret = trace_print_lat_fmt(s, entry);
643 if (!ret)
644 return 0;
645 }
646
647 return trace_seq_printf(s, " %5lu.%06lu: ",
648 secs, usec_rem);
649}
650
651int trace_print_lat_context(struct trace_iterator *iter)
652{
653 u64 next_ts;
654 int ret;
655 /* trace_find_next_entry will reset ent_size */
656 int ent_size = iter->ent_size;
657 struct trace_seq *s = &iter->seq;
658 struct trace_entry *entry = iter->ent,
659 *next_entry = trace_find_next_entry(iter, NULL,
660 &next_ts);
661 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
662 unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
663 unsigned long rel_usecs;
664
665 /* Restore the original ent_size */
666 iter->ent_size = ent_size;
667
668 if (!next_entry)
669 next_ts = iter->ts;
670 rel_usecs = ns2usecs(next_ts - iter->ts);
671
672 if (verbose) {
673 char comm[TASK_COMM_LEN];
674
675 trace_find_cmdline(entry->pid, comm);
676
677 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
678 " %ld.%03ldms (+%ld.%03ldms): ", comm,
679 entry->pid, iter->cpu, entry->flags,
680 entry->preempt_count, iter->idx,
681 ns2usecs(iter->ts),
682 abs_usecs / USEC_PER_MSEC,
683 abs_usecs % USEC_PER_MSEC,
684 rel_usecs / USEC_PER_MSEC,
685 rel_usecs % USEC_PER_MSEC);
686 } else {
687 ret = lat_print_generic(s, entry, iter->cpu);
688 if (ret)
689 ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
690 }
691
692 return ret;
693}
694
695static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
696
697static int task_state_char(unsigned long state)
698{
699 int bit = state ? __ffs(state) + 1 : 0;
700
701 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
702}
703
704/**
705 * ftrace_find_event - find a registered event
706 * @type: the type of event to look for
707 *
708 * Returns an event of type @type otherwise NULL
709 * Called with trace_event_read_lock() held.
710 */
711struct trace_event *ftrace_find_event(int type)
712{
713 struct trace_event *event;
714 struct hlist_node *n;
715 unsigned key;
716
717 key = type & (EVENT_HASHSIZE - 1);
718
719 hlist_for_each_entry(event, n, &event_hash[key], node) {
720 if (event->type == type)
721 return event;
722 }
723
724 return NULL;
725}
726
727static LIST_HEAD(ftrace_event_list);
728
729static int trace_search_list(struct list_head **list)
730{
731 struct trace_event *e;
732 int last = __TRACE_LAST_TYPE;
733
734 if (list_empty(&ftrace_event_list)) {
735 *list = &ftrace_event_list;
736 return last + 1;
737 }
738
739 /*
740 * We used up all possible max events,
741 * lets see if somebody freed one.
742 */
743 list_for_each_entry(e, &ftrace_event_list, list) {
744 if (e->type != last + 1)
745 break;
746 last++;
747 }
748
749 /* Did we used up all 65 thousand events??? */
750 if ((last + 1) > FTRACE_MAX_EVENT)
751 return 0;
752
753 *list = &e->list;
754 return last + 1;
755}
756
757void trace_event_read_lock(void)
758{
759 down_read(&trace_event_mutex);
760}
761
762void trace_event_read_unlock(void)
763{
764 up_read(&trace_event_mutex);
765}
766
767/**
768 * register_ftrace_event - register output for an event type
769 * @event: the event type to register
770 *
771 * Event types are stored in a hash and this hash is used to
772 * find a way to print an event. If the @event->type is set
773 * then it will use that type, otherwise it will assign a
774 * type to use.
775 *
776 * If you assign your own type, please make sure it is added
777 * to the trace_type enum in trace.h, to avoid collisions
778 * with the dynamic types.
779 *
780 * Returns the event type number or zero on error.
781 */
782int register_ftrace_event(struct trace_event *event)
783{
784 unsigned key;
785 int ret = 0;
786
787 down_write(&trace_event_mutex);
788
789 if (WARN_ON(!event))
790 goto out;
791
792 if (WARN_ON(!event->funcs))
793 goto out;
794
795 INIT_LIST_HEAD(&event->list);
796
797 if (!event->type) {
798 struct list_head *list = NULL;
799
800 if (next_event_type > FTRACE_MAX_EVENT) {
801
802 event->type = trace_search_list(&list);
803 if (!event->type)
804 goto out;
805
806 } else {
807
808 event->type = next_event_type++;
809 list = &ftrace_event_list;
810 }
811
812 if (WARN_ON(ftrace_find_event(event->type)))
813 goto out;
814
815 list_add_tail(&event->list, list);
816
817 } else if (event->type > __TRACE_LAST_TYPE) {
818 printk(KERN_WARNING "Need to add type to trace.h\n");
819 WARN_ON(1);
820 goto out;
821 } else {
822 /* Is this event already used */
823 if (ftrace_find_event(event->type))
824 goto out;
825 }
826
827 if (event->funcs->trace == NULL)
828 event->funcs->trace = trace_nop_print;
829 if (event->funcs->raw == NULL)
830 event->funcs->raw = trace_nop_print;
831 if (event->funcs->hex == NULL)
832 event->funcs->hex = trace_nop_print;
833 if (event->funcs->binary == NULL)
834 event->funcs->binary = trace_nop_print;
835
836 key = event->type & (EVENT_HASHSIZE - 1);
837
838 hlist_add_head(&event->node, &event_hash[key]);
839
840 ret = event->type;
841 out:
842 up_write(&trace_event_mutex);
843
844 return ret;
845}
846EXPORT_SYMBOL_GPL(register_ftrace_event);
847
848/*
849 * Used by module code with the trace_event_mutex held for write.
850 */
851int __unregister_ftrace_event(struct trace_event *event)
852{
853 hlist_del(&event->node);
854 list_del(&event->list);
855 return 0;
856}
857
858/**
859 * unregister_ftrace_event - remove a no longer used event
860 * @event: the event to remove
861 */
862int unregister_ftrace_event(struct trace_event *event)
863{
864 down_write(&trace_event_mutex);
865 __unregister_ftrace_event(event);
866 up_write(&trace_event_mutex);
867
868 return 0;
869}
870EXPORT_SYMBOL_GPL(unregister_ftrace_event);
871
872/*
873 * Standard events
874 */
875
876enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
877 struct trace_event *event)
878{
879 if (!trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type))
880 return TRACE_TYPE_PARTIAL_LINE;
881
882 return TRACE_TYPE_HANDLED;
883}
884
885/* TRACE_FN */
886static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
887 struct trace_event *event)
888{
889 struct ftrace_entry *field;
890 struct trace_seq *s = &iter->seq;
891
892 trace_assign_type(field, iter->ent);
893
894 if (!seq_print_ip_sym(s, field->ip, flags))
895 goto partial;
896
897 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
898 if (!trace_seq_printf(s, " <-"))
899 goto partial;
900 if (!seq_print_ip_sym(s,
901 field->parent_ip,
902 flags))
903 goto partial;
904 }
905 if (!trace_seq_printf(s, "\n"))
906 goto partial;
907
908 return TRACE_TYPE_HANDLED;
909
910 partial:
911 return TRACE_TYPE_PARTIAL_LINE;
912}
913
914static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
915 struct trace_event *event)
916{
917 struct ftrace_entry *field;
918
919 trace_assign_type(field, iter->ent);
920
921 if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
922 field->ip,
923 field->parent_ip))
924 return TRACE_TYPE_PARTIAL_LINE;
925
926 return TRACE_TYPE_HANDLED;
927}
928
929static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
930 struct trace_event *event)
931{
932 struct ftrace_entry *field;
933 struct trace_seq *s = &iter->seq;
934
935 trace_assign_type(field, iter->ent);
936
937 SEQ_PUT_HEX_FIELD_RET(s, field->ip);
938 SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
939
940 return TRACE_TYPE_HANDLED;
941}
942
943static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
944 struct trace_event *event)
945{
946 struct ftrace_entry *field;
947 struct trace_seq *s = &iter->seq;
948
949 trace_assign_type(field, iter->ent);
950
951 SEQ_PUT_FIELD_RET(s, field->ip);
952 SEQ_PUT_FIELD_RET(s, field->parent_ip);
953
954 return TRACE_TYPE_HANDLED;
955}
956
957static struct trace_event_functions trace_fn_funcs = {
958 .trace = trace_fn_trace,
959 .raw = trace_fn_raw,
960 .hex = trace_fn_hex,
961 .binary = trace_fn_bin,
962};
963
964static struct trace_event trace_fn_event = {
965 .type = TRACE_FN,
966 .funcs = &trace_fn_funcs,
967};
968
969/* TRACE_CTX an TRACE_WAKE */
970static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
971 char *delim)
972{
973 struct ctx_switch_entry *field;
974 char comm[TASK_COMM_LEN];
975 int S, T;
976
977
978 trace_assign_type(field, iter->ent);
979
980 T = task_state_char(field->next_state);
981 S = task_state_char(field->prev_state);
982 trace_find_cmdline(field->next_pid, comm);
983 if (!trace_seq_printf(&iter->seq,
984 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
985 field->prev_pid,
986 field->prev_prio,
987 S, delim,
988 field->next_cpu,
989 field->next_pid,
990 field->next_prio,
991 T, comm))
992 return TRACE_TYPE_PARTIAL_LINE;
993
994 return TRACE_TYPE_HANDLED;
995}
996
997static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
998 struct trace_event *event)
999{
1000 return trace_ctxwake_print(iter, "==>");
1001}
1002
1003static enum print_line_t trace_wake_print(struct trace_iterator *iter,
1004 int flags, struct trace_event *event)
1005{
1006 return trace_ctxwake_print(iter, " +");
1007}
1008
1009static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
1010{
1011 struct ctx_switch_entry *field;
1012 int T;
1013
1014 trace_assign_type(field, iter->ent);
1015
1016 if (!S)
1017 S = task_state_char(field->prev_state);
1018 T = task_state_char(field->next_state);
1019 if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
1020 field->prev_pid,
1021 field->prev_prio,
1022 S,
1023 field->next_cpu,
1024 field->next_pid,
1025 field->next_prio,
1026 T))
1027 return TRACE_TYPE_PARTIAL_LINE;
1028
1029 return TRACE_TYPE_HANDLED;
1030}
1031
1032static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
1033 struct trace_event *event)
1034{
1035 return trace_ctxwake_raw(iter, 0);
1036}
1037
1038static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
1039 struct trace_event *event)
1040{
1041 return trace_ctxwake_raw(iter, '+');
1042}
1043
1044
1045static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
1046{
1047 struct ctx_switch_entry *field;
1048 struct trace_seq *s = &iter->seq;
1049 int T;
1050
1051 trace_assign_type(field, iter->ent);
1052
1053 if (!S)
1054 S = task_state_char(field->prev_state);
1055 T = task_state_char(field->next_state);
1056
1057 SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
1058 SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
1059 SEQ_PUT_HEX_FIELD_RET(s, S);
1060 SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
1061 SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
1062 SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
1063 SEQ_PUT_HEX_FIELD_RET(s, T);
1064
1065 return TRACE_TYPE_HANDLED;
1066}
1067
1068static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1069 struct trace_event *event)
1070{
1071 return trace_ctxwake_hex(iter, 0);
1072}
1073
1074static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1075 struct trace_event *event)
1076{
1077 return trace_ctxwake_hex(iter, '+');
1078}
1079
1080static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1081 int flags, struct trace_event *event)
1082{
1083 struct ctx_switch_entry *field;
1084 struct trace_seq *s = &iter->seq;
1085
1086 trace_assign_type(field, iter->ent);
1087
1088 SEQ_PUT_FIELD_RET(s, field->prev_pid);
1089 SEQ_PUT_FIELD_RET(s, field->prev_prio);
1090 SEQ_PUT_FIELD_RET(s, field->prev_state);
1091 SEQ_PUT_FIELD_RET(s, field->next_pid);
1092 SEQ_PUT_FIELD_RET(s, field->next_prio);
1093 SEQ_PUT_FIELD_RET(s, field->next_state);
1094
1095 return TRACE_TYPE_HANDLED;
1096}
1097
1098static struct trace_event_functions trace_ctx_funcs = {
1099 .trace = trace_ctx_print,
1100 .raw = trace_ctx_raw,
1101 .hex = trace_ctx_hex,
1102 .binary = trace_ctxwake_bin,
1103};
1104
1105static struct trace_event trace_ctx_event = {
1106 .type = TRACE_CTX,
1107 .funcs = &trace_ctx_funcs,
1108};
1109
1110static struct trace_event_functions trace_wake_funcs = {
1111 .trace = trace_wake_print,
1112 .raw = trace_wake_raw,
1113 .hex = trace_wake_hex,
1114 .binary = trace_ctxwake_bin,
1115};
1116
1117static struct trace_event trace_wake_event = {
1118 .type = TRACE_WAKE,
1119 .funcs = &trace_wake_funcs,
1120};
1121
1122/* TRACE_STACK */
1123
1124static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1125 int flags, struct trace_event *event)
1126{
1127 struct stack_entry *field;
1128 struct trace_seq *s = &iter->seq;
1129 unsigned long *p;
1130 unsigned long *end;
1131
1132 trace_assign_type(field, iter->ent);
1133 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1134
1135 if (!trace_seq_puts(s, "<stack trace>\n"))
1136 goto partial;
1137
1138 for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1139 if (!trace_seq_puts(s, " => "))
1140 goto partial;
1141
1142 if (!seq_print_ip_sym(s, *p, flags))
1143 goto partial;
1144 if (!trace_seq_puts(s, "\n"))
1145 goto partial;
1146 }
1147
1148 return TRACE_TYPE_HANDLED;
1149
1150 partial:
1151 return TRACE_TYPE_PARTIAL_LINE;
1152}
1153
1154static struct trace_event_functions trace_stack_funcs = {
1155 .trace = trace_stack_print,
1156};
1157
1158static struct trace_event trace_stack_event = {
1159 .type = TRACE_STACK,
1160 .funcs = &trace_stack_funcs,
1161};
1162
1163/* TRACE_USER_STACK */
1164static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1165 int flags, struct trace_event *event)
1166{
1167 struct userstack_entry *field;
1168 struct trace_seq *s = &iter->seq;
1169
1170 trace_assign_type(field, iter->ent);
1171
1172 if (!trace_seq_puts(s, "<user stack trace>\n"))
1173 goto partial;
1174
1175 if (!seq_print_userip_objs(field, s, flags))
1176 goto partial;
1177
1178 return TRACE_TYPE_HANDLED;
1179
1180 partial:
1181 return TRACE_TYPE_PARTIAL_LINE;
1182}
1183
1184static struct trace_event_functions trace_user_stack_funcs = {
1185 .trace = trace_user_stack_print,
1186};
1187
1188static struct trace_event trace_user_stack_event = {
1189 .type = TRACE_USER_STACK,
1190 .funcs = &trace_user_stack_funcs,
1191};
1192
1193/* TRACE_BPRINT */
1194static enum print_line_t
1195trace_bprint_print(struct trace_iterator *iter, int flags,
1196 struct trace_event *event)
1197{
1198 struct trace_entry *entry = iter->ent;
1199 struct trace_seq *s = &iter->seq;
1200 struct bprint_entry *field;
1201
1202 trace_assign_type(field, entry);
1203
1204 if (!seq_print_ip_sym(s, field->ip, flags))
1205 goto partial;
1206
1207 if (!trace_seq_puts(s, ": "))
1208 goto partial;
1209
1210 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1211 goto partial;
1212
1213 return TRACE_TYPE_HANDLED;
1214
1215 partial:
1216 return TRACE_TYPE_PARTIAL_LINE;
1217}
1218
1219
1220static enum print_line_t
1221trace_bprint_raw(struct trace_iterator *iter, int flags,
1222 struct trace_event *event)
1223{
1224 struct bprint_entry *field;
1225 struct trace_seq *s = &iter->seq;
1226
1227 trace_assign_type(field, iter->ent);
1228
1229 if (!trace_seq_printf(s, ": %lx : ", field->ip))
1230 goto partial;
1231
1232 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1233 goto partial;
1234
1235 return TRACE_TYPE_HANDLED;
1236
1237 partial:
1238 return TRACE_TYPE_PARTIAL_LINE;
1239}
1240
1241static struct trace_event_functions trace_bprint_funcs = {
1242 .trace = trace_bprint_print,
1243 .raw = trace_bprint_raw,
1244};
1245
1246static struct trace_event trace_bprint_event = {
1247 .type = TRACE_BPRINT,
1248 .funcs = &trace_bprint_funcs,
1249};
1250
1251/* TRACE_PRINT */
1252static enum print_line_t trace_print_print(struct trace_iterator *iter,
1253 int flags, struct trace_event *event)
1254{
1255 struct print_entry *field;
1256 struct trace_seq *s = &iter->seq;
1257
1258 trace_assign_type(field, iter->ent);
1259
1260 if (!seq_print_ip_sym(s, field->ip, flags))
1261 goto partial;
1262
1263 if (!trace_seq_printf(s, ": %s", field->buf))
1264 goto partial;
1265
1266 return TRACE_TYPE_HANDLED;
1267
1268 partial:
1269 return TRACE_TYPE_PARTIAL_LINE;
1270}
1271
1272static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1273 struct trace_event *event)
1274{
1275 struct print_entry *field;
1276
1277 trace_assign_type(field, iter->ent);
1278
1279 if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1280 goto partial;
1281
1282 return TRACE_TYPE_HANDLED;
1283
1284 partial:
1285 return TRACE_TYPE_PARTIAL_LINE;
1286}
1287
1288static struct trace_event_functions trace_print_funcs = {
1289 .trace = trace_print_print,
1290 .raw = trace_print_raw,
1291};
1292
1293static struct trace_event trace_print_event = {
1294 .type = TRACE_PRINT,
1295 .funcs = &trace_print_funcs,
1296};
1297
1298
1299static struct trace_event *events[] __initdata = {
1300 &trace_fn_event,
1301 &trace_ctx_event,
1302 &trace_wake_event,
1303 &trace_stack_event,
1304 &trace_user_stack_event,
1305 &trace_bprint_event,
1306 &trace_print_event,
1307 NULL
1308};
1309
1310__init static int init_events(void)
1311{
1312 struct trace_event *event;
1313 int i, ret;
1314
1315 for (i = 0; events[i]; i++) {
1316 event = events[i];
1317
1318 ret = register_ftrace_event(event);
1319 if (!ret) {
1320 printk(KERN_WARNING "event %d failed to register\n",
1321 event->type);
1322 WARN_ON_ONCE(1);
1323 }
1324 }
1325
1326 return 0;
1327}
1328device_initcall(init_events);