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_mutex);
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_seq(struct seq_file * m,struct trace_seq * s)23 int 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
trace_print_bprintk_msg_only(struct trace_iterator * iter)40 enum 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
trace_print_printk_msg_only(struct trace_iterator * iter)56 enum 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 */
86 int
trace_seq_printf(struct trace_seq * s,const char * fmt,...)87 trace_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 }
110 EXPORT_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 */
123 int
trace_seq_vprintf(struct trace_seq * s,const char * fmt,va_list args)124 trace_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 }
144 EXPORT_SYMBOL_GPL(trace_seq_vprintf);
145
trace_seq_bprintf(struct trace_seq * s,const char * fmt,const u32 * binary)146 int 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 */
trace_seq_puts(struct trace_seq * s,const char * str)177 int 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
trace_seq_putc(struct trace_seq * s,unsigned char c)195 int 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 }
209 EXPORT_SYMBOL(trace_seq_putc);
210
trace_seq_putmem(struct trace_seq * s,const void * mem,size_t len)211 int 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
trace_seq_putmem_hex(struct trace_seq * s,const void * mem,size_t len)227 int 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
249 void *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
267 int 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
295 const char *
296 ftrace_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 }
329 EXPORT_SYMBOL(ftrace_print_flags_seq);
330
331 const char *
332 ftrace_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 }
354 EXPORT_SYMBOL(ftrace_print_symbols_seq);
355
356 const char *
357 ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
358 {
359 int i;
360 const char *ret = p->buffer + p->len;
361
362 for (i = 0; i < buf_len; i++)
363 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
364
365 trace_seq_putc(p, 0);
366
367 return ret;
368 }
369 EXPORT_SYMBOL(ftrace_print_hex_seq);
370
371 #ifdef CONFIG_KRETPROBES
372 static inline const char *kretprobed(const char *name)
373 {
374 static const char tramp_name[] = "kretprobe_trampoline";
375 int size = sizeof(tramp_name);
376
377 if (strncmp(tramp_name, name, size) == 0)
378 return "[unknown/kretprobe'd]";
379 return name;
380 }
381 #else
382 static inline const char *kretprobed(const char *name)
383 {
384 return name;
385 }
386 #endif /* CONFIG_KRETPROBES */
387
388 static int
389 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
390 {
391 #ifdef CONFIG_KALLSYMS
392 char str[KSYM_SYMBOL_LEN];
393 const char *name;
394
395 kallsyms_lookup(address, NULL, NULL, NULL, str);
396
397 name = kretprobed(str);
398
399 return trace_seq_printf(s, fmt, name);
400 #endif
401 return 1;
402 }
403
404 static int
405 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
406 unsigned long address)
407 {
408 #ifdef CONFIG_KALLSYMS
409 char str[KSYM_SYMBOL_LEN];
410 const char *name;
411
412 sprint_symbol(str, address);
413 name = kretprobed(str);
414
415 return trace_seq_printf(s, fmt, name);
416 #endif
417 return 1;
418 }
419
420 #ifndef CONFIG_64BIT
421 # define IP_FMT "%08lx"
422 #else
423 # define IP_FMT "%016lx"
424 #endif
425
426 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
427 unsigned long ip, unsigned long sym_flags)
428 {
429 struct file *file = NULL;
430 unsigned long vmstart = 0;
431 int ret = 1;
432
433 if (s->full)
434 return 0;
435
436 if (mm) {
437 const struct vm_area_struct *vma;
438
439 down_read(&mm->mmap_sem);
440 vma = find_vma(mm, ip);
441 if (vma) {
442 file = vma->vm_file;
443 vmstart = vma->vm_start;
444 }
445 if (file) {
446 ret = trace_seq_path(s, &file->f_path);
447 if (ret)
448 ret = trace_seq_printf(s, "[+0x%lx]",
449 ip - vmstart);
450 }
451 up_read(&mm->mmap_sem);
452 }
453 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
454 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
455 return ret;
456 }
457
458 int
459 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
460 unsigned long sym_flags)
461 {
462 struct mm_struct *mm = NULL;
463 int ret = 1;
464 unsigned int i;
465
466 if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
467 struct task_struct *task;
468 /*
469 * we do the lookup on the thread group leader,
470 * since individual threads might have already quit!
471 */
472 rcu_read_lock();
473 task = find_task_by_vpid(entry->tgid);
474 if (task)
475 mm = get_task_mm(task);
476 rcu_read_unlock();
477 }
478
479 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
480 unsigned long ip = entry->caller[i];
481
482 if (ip == ULONG_MAX || !ret)
483 break;
484 if (ret)
485 ret = trace_seq_puts(s, " => ");
486 if (!ip) {
487 if (ret)
488 ret = trace_seq_puts(s, "??");
489 if (ret)
490 ret = trace_seq_puts(s, "\n");
491 continue;
492 }
493 if (!ret)
494 break;
495 if (ret)
496 ret = seq_print_user_ip(s, mm, ip, sym_flags);
497 ret = trace_seq_puts(s, "\n");
498 }
499
500 if (mm)
501 mmput(mm);
502 return ret;
503 }
504
505 int
506 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
507 {
508 int ret;
509
510 if (!ip)
511 return trace_seq_printf(s, "0");
512
513 if (sym_flags & TRACE_ITER_SYM_OFFSET)
514 ret = seq_print_sym_offset(s, "%s", ip);
515 else
516 ret = seq_print_sym_short(s, "%s", ip);
517
518 if (!ret)
519 return 0;
520
521 if (sym_flags & TRACE_ITER_SYM_ADDR)
522 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
523 return ret;
524 }
525
526 /**
527 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
528 * @s: trace seq struct to write to
529 * @entry: The trace entry field from the ring buffer
530 *
531 * Prints the generic fields of irqs off, in hard or softirq, preempt
532 * count.
533 */
534 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
535 {
536 char hardsoft_irq;
537 char need_resched;
538 char irqs_off;
539 int hardirq;
540 int softirq;
541 int ret;
542
543 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
544 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
545
546 irqs_off =
547 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
548 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
549 '.';
550 need_resched =
551 (entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.';
552 hardsoft_irq =
553 (hardirq && softirq) ? 'H' :
554 hardirq ? 'h' :
555 softirq ? 's' :
556 '.';
557
558 if (!trace_seq_printf(s, "%c%c%c",
559 irqs_off, need_resched, hardsoft_irq))
560 return 0;
561
562 if (entry->preempt_count)
563 ret = trace_seq_printf(s, "%x", entry->preempt_count);
564 else
565 ret = trace_seq_putc(s, '.');
566
567 return ret;
568 }
569
570 static int
571 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
572 {
573 char comm[TASK_COMM_LEN];
574
575 trace_find_cmdline(entry->pid, comm);
576
577 if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
578 comm, entry->pid, cpu))
579 return 0;
580
581 return trace_print_lat_fmt(s, entry);
582 }
583
584 static unsigned long preempt_mark_thresh = 100;
585
586 static int
587 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
588 unsigned long rel_usecs)
589 {
590 return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
591 rel_usecs > preempt_mark_thresh ? '!' :
592 rel_usecs > 1 ? '+' : ' ');
593 }
594
595 int trace_print_context(struct trace_iterator *iter)
596 {
597 struct trace_seq *s = &iter->seq;
598 struct trace_entry *entry = iter->ent;
599 unsigned long long t = ns2usecs(iter->ts);
600 unsigned long usec_rem = do_div(t, USEC_PER_SEC);
601 unsigned long secs = (unsigned long)t;
602 char comm[TASK_COMM_LEN];
603
604 trace_find_cmdline(entry->pid, comm);
605
606 return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
607 comm, entry->pid, iter->cpu, secs, usec_rem);
608 }
609
610 int trace_print_lat_context(struct trace_iterator *iter)
611 {
612 u64 next_ts;
613 int ret;
614 struct trace_seq *s = &iter->seq;
615 struct trace_entry *entry = iter->ent,
616 *next_entry = trace_find_next_entry(iter, NULL,
617 &next_ts);
618 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
619 unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
620 unsigned long rel_usecs;
621
622 if (!next_entry)
623 next_ts = iter->ts;
624 rel_usecs = ns2usecs(next_ts - iter->ts);
625
626 if (verbose) {
627 char comm[TASK_COMM_LEN];
628
629 trace_find_cmdline(entry->pid, comm);
630
631 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
632 " %ld.%03ldms (+%ld.%03ldms): ", comm,
633 entry->pid, iter->cpu, entry->flags,
634 entry->preempt_count, iter->idx,
635 ns2usecs(iter->ts),
636 abs_usecs / USEC_PER_MSEC,
637 abs_usecs % USEC_PER_MSEC,
638 rel_usecs / USEC_PER_MSEC,
639 rel_usecs % USEC_PER_MSEC);
640 } else {
641 ret = lat_print_generic(s, entry, iter->cpu);
642 if (ret)
643 ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
644 }
645
646 return ret;
647 }
648
649 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
650
651 static int task_state_char(unsigned long state)
652 {
653 int bit = state ? __ffs(state) + 1 : 0;
654
655 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
656 }
657
658 /**
659 * ftrace_find_event - find a registered event
660 * @type: the type of event to look for
661 *
662 * Returns an event of type @type otherwise NULL
663 * Called with trace_event_read_lock() held.
664 */
665 struct trace_event *ftrace_find_event(int type)
666 {
667 struct trace_event *event;
668 struct hlist_node *n;
669 unsigned key;
670
671 key = type & (EVENT_HASHSIZE - 1);
672
673 hlist_for_each_entry(event, n, &event_hash[key], node) {
674 if (event->type == type)
675 return event;
676 }
677
678 return NULL;
679 }
680
681 static LIST_HEAD(ftrace_event_list);
682
683 static int trace_search_list(struct list_head **list)
684 {
685 struct trace_event *e;
686 int last = __TRACE_LAST_TYPE;
687
688 if (list_empty(&ftrace_event_list)) {
689 *list = &ftrace_event_list;
690 return last + 1;
691 }
692
693 /*
694 * We used up all possible max events,
695 * lets see if somebody freed one.
696 */
697 list_for_each_entry(e, &ftrace_event_list, list) {
698 if (e->type != last + 1)
699 break;
700 last++;
701 }
702
703 /* Did we used up all 65 thousand events??? */
704 if ((last + 1) > FTRACE_MAX_EVENT)
705 return 0;
706
707 *list = &e->list;
708 return last + 1;
709 }
710
711 void trace_event_read_lock(void)
712 {
713 down_read(&trace_event_mutex);
714 }
715
716 void trace_event_read_unlock(void)
717 {
718 up_read(&trace_event_mutex);
719 }
720
721 /**
722 * register_ftrace_event - register output for an event type
723 * @event: the event type to register
724 *
725 * Event types are stored in a hash and this hash is used to
726 * find a way to print an event. If the @event->type is set
727 * then it will use that type, otherwise it will assign a
728 * type to use.
729 *
730 * If you assign your own type, please make sure it is added
731 * to the trace_type enum in trace.h, to avoid collisions
732 * with the dynamic types.
733 *
734 * Returns the event type number or zero on error.
735 */
736 int register_ftrace_event(struct trace_event *event)
737 {
738 unsigned key;
739 int ret = 0;
740
741 down_write(&trace_event_mutex);
742
743 if (WARN_ON(!event))
744 goto out;
745
746 if (WARN_ON(!event->funcs))
747 goto out;
748
749 INIT_LIST_HEAD(&event->list);
750
751 if (!event->type) {
752 struct list_head *list = NULL;
753
754 if (next_event_type > FTRACE_MAX_EVENT) {
755
756 event->type = trace_search_list(&list);
757 if (!event->type)
758 goto out;
759
760 } else {
761
762 event->type = next_event_type++;
763 list = &ftrace_event_list;
764 }
765
766 if (WARN_ON(ftrace_find_event(event->type)))
767 goto out;
768
769 list_add_tail(&event->list, list);
770
771 } else if (event->type > __TRACE_LAST_TYPE) {
772 printk(KERN_WARNING "Need to add type to trace.h\n");
773 WARN_ON(1);
774 goto out;
775 } else {
776 /* Is this event already used */
777 if (ftrace_find_event(event->type))
778 goto out;
779 }
780
781 if (event->funcs->trace == NULL)
782 event->funcs->trace = trace_nop_print;
783 if (event->funcs->raw == NULL)
784 event->funcs->raw = trace_nop_print;
785 if (event->funcs->hex == NULL)
786 event->funcs->hex = trace_nop_print;
787 if (event->funcs->binary == NULL)
788 event->funcs->binary = trace_nop_print;
789
790 key = event->type & (EVENT_HASHSIZE - 1);
791
792 hlist_add_head(&event->node, &event_hash[key]);
793
794 ret = event->type;
795 out:
796 up_write(&trace_event_mutex);
797
798 return ret;
799 }
800 EXPORT_SYMBOL_GPL(register_ftrace_event);
801
802 /*
803 * Used by module code with the trace_event_mutex held for write.
804 */
805 int __unregister_ftrace_event(struct trace_event *event)
806 {
807 hlist_del(&event->node);
808 list_del(&event->list);
809 return 0;
810 }
811
812 /**
813 * unregister_ftrace_event - remove a no longer used event
814 * @event: the event to remove
815 */
816 int unregister_ftrace_event(struct trace_event *event)
817 {
818 down_write(&trace_event_mutex);
819 __unregister_ftrace_event(event);
820 up_write(&trace_event_mutex);
821
822 return 0;
823 }
824 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
825
826 /*
827 * Standard events
828 */
829
830 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
831 struct trace_event *event)
832 {
833 return TRACE_TYPE_HANDLED;
834 }
835
836 /* TRACE_FN */
837 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
838 struct trace_event *event)
839 {
840 struct ftrace_entry *field;
841 struct trace_seq *s = &iter->seq;
842
843 trace_assign_type(field, iter->ent);
844
845 if (!seq_print_ip_sym(s, field->ip, flags))
846 goto partial;
847
848 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
849 if (!trace_seq_printf(s, " <-"))
850 goto partial;
851 if (!seq_print_ip_sym(s,
852 field->parent_ip,
853 flags))
854 goto partial;
855 }
856 if (!trace_seq_printf(s, "\n"))
857 goto partial;
858
859 return TRACE_TYPE_HANDLED;
860
861 partial:
862 return TRACE_TYPE_PARTIAL_LINE;
863 }
864
865 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
866 struct trace_event *event)
867 {
868 struct ftrace_entry *field;
869
870 trace_assign_type(field, iter->ent);
871
872 if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
873 field->ip,
874 field->parent_ip))
875 return TRACE_TYPE_PARTIAL_LINE;
876
877 return TRACE_TYPE_HANDLED;
878 }
879
880 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
881 struct trace_event *event)
882 {
883 struct ftrace_entry *field;
884 struct trace_seq *s = &iter->seq;
885
886 trace_assign_type(field, iter->ent);
887
888 SEQ_PUT_HEX_FIELD_RET(s, field->ip);
889 SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
890
891 return TRACE_TYPE_HANDLED;
892 }
893
894 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
895 struct trace_event *event)
896 {
897 struct ftrace_entry *field;
898 struct trace_seq *s = &iter->seq;
899
900 trace_assign_type(field, iter->ent);
901
902 SEQ_PUT_FIELD_RET(s, field->ip);
903 SEQ_PUT_FIELD_RET(s, field->parent_ip);
904
905 return TRACE_TYPE_HANDLED;
906 }
907
908 static struct trace_event_functions trace_fn_funcs = {
909 .trace = trace_fn_trace,
910 .raw = trace_fn_raw,
911 .hex = trace_fn_hex,
912 .binary = trace_fn_bin,
913 };
914
915 static struct trace_event trace_fn_event = {
916 .type = TRACE_FN,
917 .funcs = &trace_fn_funcs,
918 };
919
920 /* TRACE_CTX an TRACE_WAKE */
921 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
922 char *delim)
923 {
924 struct ctx_switch_entry *field;
925 char comm[TASK_COMM_LEN];
926 int S, T;
927
928
929 trace_assign_type(field, iter->ent);
930
931 T = task_state_char(field->next_state);
932 S = task_state_char(field->prev_state);
933 trace_find_cmdline(field->next_pid, comm);
934 if (!trace_seq_printf(&iter->seq,
935 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
936 field->prev_pid,
937 field->prev_prio,
938 S, delim,
939 field->next_cpu,
940 field->next_pid,
941 field->next_prio,
942 T, comm))
943 return TRACE_TYPE_PARTIAL_LINE;
944
945 return TRACE_TYPE_HANDLED;
946 }
947
948 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
949 struct trace_event *event)
950 {
951 return trace_ctxwake_print(iter, "==>");
952 }
953
954 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
955 int flags, struct trace_event *event)
956 {
957 return trace_ctxwake_print(iter, " +");
958 }
959
960 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
961 {
962 struct ctx_switch_entry *field;
963 int T;
964
965 trace_assign_type(field, iter->ent);
966
967 if (!S)
968 S = task_state_char(field->prev_state);
969 T = task_state_char(field->next_state);
970 if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
971 field->prev_pid,
972 field->prev_prio,
973 S,
974 field->next_cpu,
975 field->next_pid,
976 field->next_prio,
977 T))
978 return TRACE_TYPE_PARTIAL_LINE;
979
980 return TRACE_TYPE_HANDLED;
981 }
982
983 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
984 struct trace_event *event)
985 {
986 return trace_ctxwake_raw(iter, 0);
987 }
988
989 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
990 struct trace_event *event)
991 {
992 return trace_ctxwake_raw(iter, '+');
993 }
994
995
996 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
997 {
998 struct ctx_switch_entry *field;
999 struct trace_seq *s = &iter->seq;
1000 int T;
1001
1002 trace_assign_type(field, iter->ent);
1003
1004 if (!S)
1005 S = task_state_char(field->prev_state);
1006 T = task_state_char(field->next_state);
1007
1008 SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
1009 SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
1010 SEQ_PUT_HEX_FIELD_RET(s, S);
1011 SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
1012 SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
1013 SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
1014 SEQ_PUT_HEX_FIELD_RET(s, T);
1015
1016 return TRACE_TYPE_HANDLED;
1017 }
1018
1019 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1020 struct trace_event *event)
1021 {
1022 return trace_ctxwake_hex(iter, 0);
1023 }
1024
1025 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1026 struct trace_event *event)
1027 {
1028 return trace_ctxwake_hex(iter, '+');
1029 }
1030
1031 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1032 int flags, struct trace_event *event)
1033 {
1034 struct ctx_switch_entry *field;
1035 struct trace_seq *s = &iter->seq;
1036
1037 trace_assign_type(field, iter->ent);
1038
1039 SEQ_PUT_FIELD_RET(s, field->prev_pid);
1040 SEQ_PUT_FIELD_RET(s, field->prev_prio);
1041 SEQ_PUT_FIELD_RET(s, field->prev_state);
1042 SEQ_PUT_FIELD_RET(s, field->next_pid);
1043 SEQ_PUT_FIELD_RET(s, field->next_prio);
1044 SEQ_PUT_FIELD_RET(s, field->next_state);
1045
1046 return TRACE_TYPE_HANDLED;
1047 }
1048
1049 static struct trace_event_functions trace_ctx_funcs = {
1050 .trace = trace_ctx_print,
1051 .raw = trace_ctx_raw,
1052 .hex = trace_ctx_hex,
1053 .binary = trace_ctxwake_bin,
1054 };
1055
1056 static struct trace_event trace_ctx_event = {
1057 .type = TRACE_CTX,
1058 .funcs = &trace_ctx_funcs,
1059 };
1060
1061 static struct trace_event_functions trace_wake_funcs = {
1062 .trace = trace_wake_print,
1063 .raw = trace_wake_raw,
1064 .hex = trace_wake_hex,
1065 .binary = trace_ctxwake_bin,
1066 };
1067
1068 static struct trace_event trace_wake_event = {
1069 .type = TRACE_WAKE,
1070 .funcs = &trace_wake_funcs,
1071 };
1072
1073 /* TRACE_STACK */
1074
1075 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1076 int flags, struct trace_event *event)
1077 {
1078 struct stack_entry *field;
1079 struct trace_seq *s = &iter->seq;
1080 int i;
1081
1082 trace_assign_type(field, iter->ent);
1083
1084 if (!trace_seq_puts(s, "<stack trace>\n"))
1085 goto partial;
1086 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1087 if (!field->caller[i] || (field->caller[i] == ULONG_MAX))
1088 break;
1089 if (!trace_seq_puts(s, " => "))
1090 goto partial;
1091
1092 if (!seq_print_ip_sym(s, field->caller[i], flags))
1093 goto partial;
1094 if (!trace_seq_puts(s, "\n"))
1095 goto partial;
1096 }
1097
1098 return TRACE_TYPE_HANDLED;
1099
1100 partial:
1101 return TRACE_TYPE_PARTIAL_LINE;
1102 }
1103
1104 static struct trace_event_functions trace_stack_funcs = {
1105 .trace = trace_stack_print,
1106 };
1107
1108 static struct trace_event trace_stack_event = {
1109 .type = TRACE_STACK,
1110 .funcs = &trace_stack_funcs,
1111 };
1112
1113 /* TRACE_USER_STACK */
1114 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1115 int flags, struct trace_event *event)
1116 {
1117 struct userstack_entry *field;
1118 struct trace_seq *s = &iter->seq;
1119
1120 trace_assign_type(field, iter->ent);
1121
1122 if (!trace_seq_puts(s, "<user stack trace>\n"))
1123 goto partial;
1124
1125 if (!seq_print_userip_objs(field, s, flags))
1126 goto partial;
1127
1128 return TRACE_TYPE_HANDLED;
1129
1130 partial:
1131 return TRACE_TYPE_PARTIAL_LINE;
1132 }
1133
1134 static struct trace_event_functions trace_user_stack_funcs = {
1135 .trace = trace_user_stack_print,
1136 };
1137
1138 static struct trace_event trace_user_stack_event = {
1139 .type = TRACE_USER_STACK,
1140 .funcs = &trace_user_stack_funcs,
1141 };
1142
1143 /* TRACE_BPRINT */
1144 static enum print_line_t
1145 trace_bprint_print(struct trace_iterator *iter, int flags,
1146 struct trace_event *event)
1147 {
1148 struct trace_entry *entry = iter->ent;
1149 struct trace_seq *s = &iter->seq;
1150 struct bprint_entry *field;
1151
1152 trace_assign_type(field, entry);
1153
1154 if (!seq_print_ip_sym(s, field->ip, flags))
1155 goto partial;
1156
1157 if (!trace_seq_puts(s, ": "))
1158 goto partial;
1159
1160 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1161 goto partial;
1162
1163 return TRACE_TYPE_HANDLED;
1164
1165 partial:
1166 return TRACE_TYPE_PARTIAL_LINE;
1167 }
1168
1169
1170 static enum print_line_t
1171 trace_bprint_raw(struct trace_iterator *iter, int flags,
1172 struct trace_event *event)
1173 {
1174 struct bprint_entry *field;
1175 struct trace_seq *s = &iter->seq;
1176
1177 trace_assign_type(field, iter->ent);
1178
1179 if (!trace_seq_printf(s, ": %lx : ", field->ip))
1180 goto partial;
1181
1182 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1183 goto partial;
1184
1185 return TRACE_TYPE_HANDLED;
1186
1187 partial:
1188 return TRACE_TYPE_PARTIAL_LINE;
1189 }
1190
1191 static struct trace_event_functions trace_bprint_funcs = {
1192 .trace = trace_bprint_print,
1193 .raw = trace_bprint_raw,
1194 };
1195
1196 static struct trace_event trace_bprint_event = {
1197 .type = TRACE_BPRINT,
1198 .funcs = &trace_bprint_funcs,
1199 };
1200
1201 /* TRACE_PRINT */
1202 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1203 int flags, struct trace_event *event)
1204 {
1205 struct print_entry *field;
1206 struct trace_seq *s = &iter->seq;
1207
1208 trace_assign_type(field, iter->ent);
1209
1210 if (!seq_print_ip_sym(s, field->ip, flags))
1211 goto partial;
1212
1213 if (!trace_seq_printf(s, ": %s", field->buf))
1214 goto partial;
1215
1216 return TRACE_TYPE_HANDLED;
1217
1218 partial:
1219 return TRACE_TYPE_PARTIAL_LINE;
1220 }
1221
1222 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1223 struct trace_event *event)
1224 {
1225 struct print_entry *field;
1226
1227 trace_assign_type(field, iter->ent);
1228
1229 if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1230 goto partial;
1231
1232 return TRACE_TYPE_HANDLED;
1233
1234 partial:
1235 return TRACE_TYPE_PARTIAL_LINE;
1236 }
1237
1238 static struct trace_event_functions trace_print_funcs = {
1239 .trace = trace_print_print,
1240 .raw = trace_print_raw,
1241 };
1242
1243 static struct trace_event trace_print_event = {
1244 .type = TRACE_PRINT,
1245 .funcs = &trace_print_funcs,
1246 };
1247
1248
1249 static struct trace_event *events[] __initdata = {
1250 &trace_fn_event,
1251 &trace_ctx_event,
1252 &trace_wake_event,
1253 &trace_stack_event,
1254 &trace_user_stack_event,
1255 &trace_bprint_event,
1256 &trace_print_event,
1257 NULL
1258 };
1259
1260 __init static int init_events(void)
1261 {
1262 struct trace_event *event;
1263 int i, ret;
1264
1265 for (i = 0; events[i]; i++) {
1266 event = events[i];
1267
1268 ret = register_ftrace_event(event);
1269 if (!ret) {
1270 printk(KERN_WARNING "event %d failed to register\n",
1271 event->type);
1272 WARN_ON_ONCE(1);
1273 }
1274 }
1275
1276 return 0;
1277 }
1278 device_initcall(init_events);
1279