xref: /openbmc/linux/kernel/trace/trace_output.c (revision c819e2cf)
1 /*
2  * trace_output.c
3  *
4  * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
5  *
6  */
7 
8 #include <linux/module.h>
9 #include <linux/mutex.h>
10 #include <linux/ftrace.h>
11 
12 #include "trace_output.h"
13 
14 /* must be a power of 2 */
15 #define EVENT_HASHSIZE	128
16 
17 DECLARE_RWSEM(trace_event_sem);
18 
19 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
20 
21 static int next_event_type = __TRACE_LAST_TYPE + 1;
22 
23 enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
24 {
25 	struct trace_seq *s = &iter->seq;
26 	struct trace_entry *entry = iter->ent;
27 	struct bputs_entry *field;
28 
29 	trace_assign_type(field, entry);
30 
31 	trace_seq_puts(s, field->str);
32 
33 	return trace_handle_return(s);
34 }
35 
36 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
37 {
38 	struct trace_seq *s = &iter->seq;
39 	struct trace_entry *entry = iter->ent;
40 	struct bprint_entry *field;
41 
42 	trace_assign_type(field, entry);
43 
44 	trace_seq_bprintf(s, field->fmt, field->buf);
45 
46 	return trace_handle_return(s);
47 }
48 
49 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
50 {
51 	struct trace_seq *s = &iter->seq;
52 	struct trace_entry *entry = iter->ent;
53 	struct print_entry *field;
54 
55 	trace_assign_type(field, entry);
56 
57 	trace_seq_puts(s, field->buf);
58 
59 	return trace_handle_return(s);
60 }
61 
62 const char *
63 ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
64 		       unsigned long flags,
65 		       const struct trace_print_flags *flag_array)
66 {
67 	unsigned long mask;
68 	const char *str;
69 	const char *ret = trace_seq_buffer_ptr(p);
70 	int i, first = 1;
71 
72 	for (i = 0;  flag_array[i].name && flags; i++) {
73 
74 		mask = flag_array[i].mask;
75 		if ((flags & mask) != mask)
76 			continue;
77 
78 		str = flag_array[i].name;
79 		flags &= ~mask;
80 		if (!first && delim)
81 			trace_seq_puts(p, delim);
82 		else
83 			first = 0;
84 		trace_seq_puts(p, str);
85 	}
86 
87 	/* check for left over flags */
88 	if (flags) {
89 		if (!first && delim)
90 			trace_seq_puts(p, delim);
91 		trace_seq_printf(p, "0x%lx", flags);
92 	}
93 
94 	trace_seq_putc(p, 0);
95 
96 	return ret;
97 }
98 EXPORT_SYMBOL(ftrace_print_flags_seq);
99 
100 const char *
101 ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
102 			 const struct trace_print_flags *symbol_array)
103 {
104 	int i;
105 	const char *ret = trace_seq_buffer_ptr(p);
106 
107 	for (i = 0;  symbol_array[i].name; i++) {
108 
109 		if (val != symbol_array[i].mask)
110 			continue;
111 
112 		trace_seq_puts(p, symbol_array[i].name);
113 		break;
114 	}
115 
116 	if (ret == (const char *)(trace_seq_buffer_ptr(p)))
117 		trace_seq_printf(p, "0x%lx", val);
118 
119 	trace_seq_putc(p, 0);
120 
121 	return ret;
122 }
123 EXPORT_SYMBOL(ftrace_print_symbols_seq);
124 
125 #if BITS_PER_LONG == 32
126 const char *
127 ftrace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
128 			 const struct trace_print_flags_u64 *symbol_array)
129 {
130 	int i;
131 	const char *ret = trace_seq_buffer_ptr(p);
132 
133 	for (i = 0;  symbol_array[i].name; i++) {
134 
135 		if (val != symbol_array[i].mask)
136 			continue;
137 
138 		trace_seq_puts(p, symbol_array[i].name);
139 		break;
140 	}
141 
142 	if (ret == (const char *)(trace_seq_buffer_ptr(p)))
143 		trace_seq_printf(p, "0x%llx", val);
144 
145 	trace_seq_putc(p, 0);
146 
147 	return ret;
148 }
149 EXPORT_SYMBOL(ftrace_print_symbols_seq_u64);
150 #endif
151 
152 const char *
153 ftrace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
154 			 unsigned int bitmask_size)
155 {
156 	const char *ret = trace_seq_buffer_ptr(p);
157 
158 	trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8);
159 	trace_seq_putc(p, 0);
160 
161 	return ret;
162 }
163 EXPORT_SYMBOL_GPL(ftrace_print_bitmask_seq);
164 
165 const char *
166 ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
167 {
168 	int i;
169 	const char *ret = trace_seq_buffer_ptr(p);
170 
171 	for (i = 0; i < buf_len; i++)
172 		trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
173 
174 	trace_seq_putc(p, 0);
175 
176 	return ret;
177 }
178 EXPORT_SYMBOL(ftrace_print_hex_seq);
179 
180 int ftrace_raw_output_prep(struct trace_iterator *iter,
181 			   struct trace_event *trace_event)
182 {
183 	struct ftrace_event_call *event;
184 	struct trace_seq *s = &iter->seq;
185 	struct trace_seq *p = &iter->tmp_seq;
186 	struct trace_entry *entry;
187 
188 	event = container_of(trace_event, struct ftrace_event_call, event);
189 	entry = iter->ent;
190 
191 	if (entry->type != event->event.type) {
192 		WARN_ON_ONCE(1);
193 		return TRACE_TYPE_UNHANDLED;
194 	}
195 
196 	trace_seq_init(p);
197 	trace_seq_printf(s, "%s: ", ftrace_event_name(event));
198 
199 	return trace_handle_return(s);
200 }
201 EXPORT_SYMBOL(ftrace_raw_output_prep);
202 
203 static int ftrace_output_raw(struct trace_iterator *iter, char *name,
204 			     char *fmt, va_list ap)
205 {
206 	struct trace_seq *s = &iter->seq;
207 
208 	trace_seq_printf(s, "%s: ", name);
209 	trace_seq_vprintf(s, fmt, ap);
210 
211 	return trace_handle_return(s);
212 }
213 
214 int ftrace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
215 {
216 	va_list ap;
217 	int ret;
218 
219 	va_start(ap, fmt);
220 	ret = ftrace_output_raw(iter, name, fmt, ap);
221 	va_end(ap);
222 
223 	return ret;
224 }
225 EXPORT_SYMBOL_GPL(ftrace_output_call);
226 
227 #ifdef CONFIG_KRETPROBES
228 static inline const char *kretprobed(const char *name)
229 {
230 	static const char tramp_name[] = "kretprobe_trampoline";
231 	int size = sizeof(tramp_name);
232 
233 	if (strncmp(tramp_name, name, size) == 0)
234 		return "[unknown/kretprobe'd]";
235 	return name;
236 }
237 #else
238 static inline const char *kretprobed(const char *name)
239 {
240 	return name;
241 }
242 #endif /* CONFIG_KRETPROBES */
243 
244 static void
245 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
246 {
247 #ifdef CONFIG_KALLSYMS
248 	char str[KSYM_SYMBOL_LEN];
249 	const char *name;
250 
251 	kallsyms_lookup(address, NULL, NULL, NULL, str);
252 
253 	name = kretprobed(str);
254 
255 	trace_seq_printf(s, fmt, name);
256 #endif
257 }
258 
259 static void
260 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
261 		     unsigned long address)
262 {
263 #ifdef CONFIG_KALLSYMS
264 	char str[KSYM_SYMBOL_LEN];
265 	const char *name;
266 
267 	sprint_symbol(str, address);
268 	name = kretprobed(str);
269 
270 	trace_seq_printf(s, fmt, name);
271 #endif
272 }
273 
274 #ifndef CONFIG_64BIT
275 # define IP_FMT "%08lx"
276 #else
277 # define IP_FMT "%016lx"
278 #endif
279 
280 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
281 		      unsigned long ip, unsigned long sym_flags)
282 {
283 	struct file *file = NULL;
284 	unsigned long vmstart = 0;
285 	int ret = 1;
286 
287 	if (s->full)
288 		return 0;
289 
290 	if (mm) {
291 		const struct vm_area_struct *vma;
292 
293 		down_read(&mm->mmap_sem);
294 		vma = find_vma(mm, ip);
295 		if (vma) {
296 			file = vma->vm_file;
297 			vmstart = vma->vm_start;
298 		}
299 		if (file) {
300 			ret = trace_seq_path(s, &file->f_path);
301 			if (ret)
302 				trace_seq_printf(s, "[+0x%lx]",
303 						 ip - vmstart);
304 		}
305 		up_read(&mm->mmap_sem);
306 	}
307 	if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
308 		trace_seq_printf(s, " <" IP_FMT ">", ip);
309 	return !trace_seq_has_overflowed(s);
310 }
311 
312 int
313 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
314 		      unsigned long sym_flags)
315 {
316 	struct mm_struct *mm = NULL;
317 	unsigned int i;
318 
319 	if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
320 		struct task_struct *task;
321 		/*
322 		 * we do the lookup on the thread group leader,
323 		 * since individual threads might have already quit!
324 		 */
325 		rcu_read_lock();
326 		task = find_task_by_vpid(entry->tgid);
327 		if (task)
328 			mm = get_task_mm(task);
329 		rcu_read_unlock();
330 	}
331 
332 	for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
333 		unsigned long ip = entry->caller[i];
334 
335 		if (ip == ULONG_MAX || trace_seq_has_overflowed(s))
336 			break;
337 
338 		trace_seq_puts(s, " => ");
339 
340 		if (!ip) {
341 			trace_seq_puts(s, "??");
342 			trace_seq_putc(s, '\n');
343 			continue;
344 		}
345 
346 		seq_print_user_ip(s, mm, ip, sym_flags);
347 		trace_seq_putc(s, '\n');
348 	}
349 
350 	if (mm)
351 		mmput(mm);
352 
353 	return !trace_seq_has_overflowed(s);
354 }
355 
356 int
357 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
358 {
359 	if (!ip) {
360 		trace_seq_putc(s, '0');
361 		goto out;
362 	}
363 
364 	if (sym_flags & TRACE_ITER_SYM_OFFSET)
365 		seq_print_sym_offset(s, "%s", ip);
366 	else
367 		seq_print_sym_short(s, "%s", ip);
368 
369 	if (sym_flags & TRACE_ITER_SYM_ADDR)
370 		trace_seq_printf(s, " <" IP_FMT ">", ip);
371 
372  out:
373 	return !trace_seq_has_overflowed(s);
374 }
375 
376 /**
377  * trace_print_lat_fmt - print the irq, preempt and lockdep fields
378  * @s: trace seq struct to write to
379  * @entry: The trace entry field from the ring buffer
380  *
381  * Prints the generic fields of irqs off, in hard or softirq, preempt
382  * count.
383  */
384 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
385 {
386 	char hardsoft_irq;
387 	char need_resched;
388 	char irqs_off;
389 	int hardirq;
390 	int softirq;
391 
392 	hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
393 	softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
394 
395 	irqs_off =
396 		(entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
397 		(entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
398 		'.';
399 
400 	switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
401 				TRACE_FLAG_PREEMPT_RESCHED)) {
402 	case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
403 		need_resched = 'N';
404 		break;
405 	case TRACE_FLAG_NEED_RESCHED:
406 		need_resched = 'n';
407 		break;
408 	case TRACE_FLAG_PREEMPT_RESCHED:
409 		need_resched = 'p';
410 		break;
411 	default:
412 		need_resched = '.';
413 		break;
414 	}
415 
416 	hardsoft_irq =
417 		(hardirq && softirq) ? 'H' :
418 		hardirq ? 'h' :
419 		softirq ? 's' :
420 		'.';
421 
422 	trace_seq_printf(s, "%c%c%c",
423 			 irqs_off, need_resched, hardsoft_irq);
424 
425 	if (entry->preempt_count)
426 		trace_seq_printf(s, "%x", entry->preempt_count);
427 	else
428 		trace_seq_putc(s, '.');
429 
430 	return !trace_seq_has_overflowed(s);
431 }
432 
433 static int
434 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
435 {
436 	char comm[TASK_COMM_LEN];
437 
438 	trace_find_cmdline(entry->pid, comm);
439 
440 	trace_seq_printf(s, "%8.8s-%-5d %3d",
441 			 comm, entry->pid, cpu);
442 
443 	return trace_print_lat_fmt(s, entry);
444 }
445 
446 #undef MARK
447 #define MARK(v, s) {.val = v, .sym = s}
448 /* trace overhead mark */
449 static const struct trace_mark {
450 	unsigned long long	val; /* unit: nsec */
451 	char			sym;
452 } mark[] = {
453 	MARK(1000000000ULL	, '$'), /* 1 sec */
454 	MARK(1000000ULL		, '#'), /* 1000 usecs */
455 	MARK(100000ULL		, '!'), /* 100 usecs */
456 	MARK(10000ULL		, '+'), /* 10 usecs */
457 };
458 #undef MARK
459 
460 char trace_find_mark(unsigned long long d)
461 {
462 	int i;
463 	int size = ARRAY_SIZE(mark);
464 
465 	for (i = 0; i < size; i++) {
466 		if (d >= mark[i].val)
467 			break;
468 	}
469 
470 	return (i == size) ? ' ' : mark[i].sym;
471 }
472 
473 static int
474 lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
475 {
476 	unsigned long verbose = trace_flags & TRACE_ITER_VERBOSE;
477 	unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
478 	unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start;
479 	unsigned long long rel_ts = next_ts - iter->ts;
480 	struct trace_seq *s = &iter->seq;
481 
482 	if (in_ns) {
483 		abs_ts = ns2usecs(abs_ts);
484 		rel_ts = ns2usecs(rel_ts);
485 	}
486 
487 	if (verbose && in_ns) {
488 		unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
489 		unsigned long abs_msec = (unsigned long)abs_ts;
490 		unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
491 		unsigned long rel_msec = (unsigned long)rel_ts;
492 
493 		trace_seq_printf(
494 			s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
495 			ns2usecs(iter->ts),
496 			abs_msec, abs_usec,
497 			rel_msec, rel_usec);
498 
499 	} else if (verbose && !in_ns) {
500 		trace_seq_printf(
501 			s, "[%016llx] %lld (+%lld): ",
502 			iter->ts, abs_ts, rel_ts);
503 
504 	} else if (!verbose && in_ns) {
505 		trace_seq_printf(
506 			s, " %4lldus%c: ",
507 			abs_ts,
508 			trace_find_mark(rel_ts * NSEC_PER_USEC));
509 
510 	} else { /* !verbose && !in_ns */
511 		trace_seq_printf(s, " %4lld: ", abs_ts);
512 	}
513 
514 	return !trace_seq_has_overflowed(s);
515 }
516 
517 int trace_print_context(struct trace_iterator *iter)
518 {
519 	struct trace_seq *s = &iter->seq;
520 	struct trace_entry *entry = iter->ent;
521 	unsigned long long t;
522 	unsigned long secs, usec_rem;
523 	char comm[TASK_COMM_LEN];
524 
525 	trace_find_cmdline(entry->pid, comm);
526 
527 	trace_seq_printf(s, "%16s-%-5d [%03d] ",
528 			       comm, entry->pid, iter->cpu);
529 
530 	if (trace_flags & TRACE_ITER_IRQ_INFO)
531 		trace_print_lat_fmt(s, entry);
532 
533 	if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
534 		t = ns2usecs(iter->ts);
535 		usec_rem = do_div(t, USEC_PER_SEC);
536 		secs = (unsigned long)t;
537 		trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
538 	} else
539 		trace_seq_printf(s, " %12llu: ", iter->ts);
540 
541 	return !trace_seq_has_overflowed(s);
542 }
543 
544 int trace_print_lat_context(struct trace_iterator *iter)
545 {
546 	u64 next_ts;
547 	/* trace_find_next_entry will reset ent_size */
548 	int ent_size = iter->ent_size;
549 	struct trace_seq *s = &iter->seq;
550 	struct trace_entry *entry = iter->ent,
551 			   *next_entry = trace_find_next_entry(iter, NULL,
552 							       &next_ts);
553 	unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
554 
555 	/* Restore the original ent_size */
556 	iter->ent_size = ent_size;
557 
558 	if (!next_entry)
559 		next_ts = iter->ts;
560 
561 	if (verbose) {
562 		char comm[TASK_COMM_LEN];
563 
564 		trace_find_cmdline(entry->pid, comm);
565 
566 		trace_seq_printf(
567 			s, "%16s %5d %3d %d %08x %08lx ",
568 			comm, entry->pid, iter->cpu, entry->flags,
569 			entry->preempt_count, iter->idx);
570 	} else {
571 		lat_print_generic(s, entry, iter->cpu);
572 	}
573 
574 	lat_print_timestamp(iter, next_ts);
575 
576 	return !trace_seq_has_overflowed(s);
577 }
578 
579 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
580 
581 static int task_state_char(unsigned long state)
582 {
583 	int bit = state ? __ffs(state) + 1 : 0;
584 
585 	return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
586 }
587 
588 /**
589  * ftrace_find_event - find a registered event
590  * @type: the type of event to look for
591  *
592  * Returns an event of type @type otherwise NULL
593  * Called with trace_event_read_lock() held.
594  */
595 struct trace_event *ftrace_find_event(int type)
596 {
597 	struct trace_event *event;
598 	unsigned key;
599 
600 	key = type & (EVENT_HASHSIZE - 1);
601 
602 	hlist_for_each_entry(event, &event_hash[key], node) {
603 		if (event->type == type)
604 			return event;
605 	}
606 
607 	return NULL;
608 }
609 
610 static LIST_HEAD(ftrace_event_list);
611 
612 static int trace_search_list(struct list_head **list)
613 {
614 	struct trace_event *e;
615 	int last = __TRACE_LAST_TYPE;
616 
617 	if (list_empty(&ftrace_event_list)) {
618 		*list = &ftrace_event_list;
619 		return last + 1;
620 	}
621 
622 	/*
623 	 * We used up all possible max events,
624 	 * lets see if somebody freed one.
625 	 */
626 	list_for_each_entry(e, &ftrace_event_list, list) {
627 		if (e->type != last + 1)
628 			break;
629 		last++;
630 	}
631 
632 	/* Did we used up all 65 thousand events??? */
633 	if ((last + 1) > FTRACE_MAX_EVENT)
634 		return 0;
635 
636 	*list = &e->list;
637 	return last + 1;
638 }
639 
640 void trace_event_read_lock(void)
641 {
642 	down_read(&trace_event_sem);
643 }
644 
645 void trace_event_read_unlock(void)
646 {
647 	up_read(&trace_event_sem);
648 }
649 
650 /**
651  * register_ftrace_event - register output for an event type
652  * @event: the event type to register
653  *
654  * Event types are stored in a hash and this hash is used to
655  * find a way to print an event. If the @event->type is set
656  * then it will use that type, otherwise it will assign a
657  * type to use.
658  *
659  * If you assign your own type, please make sure it is added
660  * to the trace_type enum in trace.h, to avoid collisions
661  * with the dynamic types.
662  *
663  * Returns the event type number or zero on error.
664  */
665 int register_ftrace_event(struct trace_event *event)
666 {
667 	unsigned key;
668 	int ret = 0;
669 
670 	down_write(&trace_event_sem);
671 
672 	if (WARN_ON(!event))
673 		goto out;
674 
675 	if (WARN_ON(!event->funcs))
676 		goto out;
677 
678 	INIT_LIST_HEAD(&event->list);
679 
680 	if (!event->type) {
681 		struct list_head *list = NULL;
682 
683 		if (next_event_type > FTRACE_MAX_EVENT) {
684 
685 			event->type = trace_search_list(&list);
686 			if (!event->type)
687 				goto out;
688 
689 		} else {
690 
691 			event->type = next_event_type++;
692 			list = &ftrace_event_list;
693 		}
694 
695 		if (WARN_ON(ftrace_find_event(event->type)))
696 			goto out;
697 
698 		list_add_tail(&event->list, list);
699 
700 	} else if (event->type > __TRACE_LAST_TYPE) {
701 		printk(KERN_WARNING "Need to add type to trace.h\n");
702 		WARN_ON(1);
703 		goto out;
704 	} else {
705 		/* Is this event already used */
706 		if (ftrace_find_event(event->type))
707 			goto out;
708 	}
709 
710 	if (event->funcs->trace == NULL)
711 		event->funcs->trace = trace_nop_print;
712 	if (event->funcs->raw == NULL)
713 		event->funcs->raw = trace_nop_print;
714 	if (event->funcs->hex == NULL)
715 		event->funcs->hex = trace_nop_print;
716 	if (event->funcs->binary == NULL)
717 		event->funcs->binary = trace_nop_print;
718 
719 	key = event->type & (EVENT_HASHSIZE - 1);
720 
721 	hlist_add_head(&event->node, &event_hash[key]);
722 
723 	ret = event->type;
724  out:
725 	up_write(&trace_event_sem);
726 
727 	return ret;
728 }
729 EXPORT_SYMBOL_GPL(register_ftrace_event);
730 
731 /*
732  * Used by module code with the trace_event_sem held for write.
733  */
734 int __unregister_ftrace_event(struct trace_event *event)
735 {
736 	hlist_del(&event->node);
737 	list_del(&event->list);
738 	return 0;
739 }
740 
741 /**
742  * unregister_ftrace_event - remove a no longer used event
743  * @event: the event to remove
744  */
745 int unregister_ftrace_event(struct trace_event *event)
746 {
747 	down_write(&trace_event_sem);
748 	__unregister_ftrace_event(event);
749 	up_write(&trace_event_sem);
750 
751 	return 0;
752 }
753 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
754 
755 /*
756  * Standard events
757  */
758 
759 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
760 				  struct trace_event *event)
761 {
762 	trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
763 
764 	return trace_handle_return(&iter->seq);
765 }
766 
767 /* TRACE_FN */
768 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
769 					struct trace_event *event)
770 {
771 	struct ftrace_entry *field;
772 	struct trace_seq *s = &iter->seq;
773 
774 	trace_assign_type(field, iter->ent);
775 
776 	seq_print_ip_sym(s, field->ip, flags);
777 
778 	if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
779 		trace_seq_puts(s, " <-");
780 		seq_print_ip_sym(s, field->parent_ip, flags);
781 	}
782 
783 	trace_seq_putc(s, '\n');
784 
785 	return trace_handle_return(s);
786 }
787 
788 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
789 				      struct trace_event *event)
790 {
791 	struct ftrace_entry *field;
792 
793 	trace_assign_type(field, iter->ent);
794 
795 	trace_seq_printf(&iter->seq, "%lx %lx\n",
796 			 field->ip,
797 			 field->parent_ip);
798 
799 	return trace_handle_return(&iter->seq);
800 }
801 
802 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
803 				      struct trace_event *event)
804 {
805 	struct ftrace_entry *field;
806 	struct trace_seq *s = &iter->seq;
807 
808 	trace_assign_type(field, iter->ent);
809 
810 	SEQ_PUT_HEX_FIELD(s, field->ip);
811 	SEQ_PUT_HEX_FIELD(s, field->parent_ip);
812 
813 	return trace_handle_return(s);
814 }
815 
816 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
817 				      struct trace_event *event)
818 {
819 	struct ftrace_entry *field;
820 	struct trace_seq *s = &iter->seq;
821 
822 	trace_assign_type(field, iter->ent);
823 
824 	SEQ_PUT_FIELD(s, field->ip);
825 	SEQ_PUT_FIELD(s, field->parent_ip);
826 
827 	return trace_handle_return(s);
828 }
829 
830 static struct trace_event_functions trace_fn_funcs = {
831 	.trace		= trace_fn_trace,
832 	.raw		= trace_fn_raw,
833 	.hex		= trace_fn_hex,
834 	.binary		= trace_fn_bin,
835 };
836 
837 static struct trace_event trace_fn_event = {
838 	.type		= TRACE_FN,
839 	.funcs		= &trace_fn_funcs,
840 };
841 
842 /* TRACE_CTX an TRACE_WAKE */
843 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
844 					     char *delim)
845 {
846 	struct ctx_switch_entry *field;
847 	char comm[TASK_COMM_LEN];
848 	int S, T;
849 
850 
851 	trace_assign_type(field, iter->ent);
852 
853 	T = task_state_char(field->next_state);
854 	S = task_state_char(field->prev_state);
855 	trace_find_cmdline(field->next_pid, comm);
856 	trace_seq_printf(&iter->seq,
857 			 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
858 			 field->prev_pid,
859 			 field->prev_prio,
860 			 S, delim,
861 			 field->next_cpu,
862 			 field->next_pid,
863 			 field->next_prio,
864 			 T, comm);
865 
866 	return trace_handle_return(&iter->seq);
867 }
868 
869 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
870 					 struct trace_event *event)
871 {
872 	return trace_ctxwake_print(iter, "==>");
873 }
874 
875 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
876 					  int flags, struct trace_event *event)
877 {
878 	return trace_ctxwake_print(iter, "  +");
879 }
880 
881 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
882 {
883 	struct ctx_switch_entry *field;
884 	int T;
885 
886 	trace_assign_type(field, iter->ent);
887 
888 	if (!S)
889 		S = task_state_char(field->prev_state);
890 	T = task_state_char(field->next_state);
891 	trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
892 			 field->prev_pid,
893 			 field->prev_prio,
894 			 S,
895 			 field->next_cpu,
896 			 field->next_pid,
897 			 field->next_prio,
898 			 T);
899 
900 	return trace_handle_return(&iter->seq);
901 }
902 
903 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
904 				       struct trace_event *event)
905 {
906 	return trace_ctxwake_raw(iter, 0);
907 }
908 
909 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
910 					struct trace_event *event)
911 {
912 	return trace_ctxwake_raw(iter, '+');
913 }
914 
915 
916 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
917 {
918 	struct ctx_switch_entry *field;
919 	struct trace_seq *s = &iter->seq;
920 	int T;
921 
922 	trace_assign_type(field, iter->ent);
923 
924 	if (!S)
925 		S = task_state_char(field->prev_state);
926 	T = task_state_char(field->next_state);
927 
928 	SEQ_PUT_HEX_FIELD(s, field->prev_pid);
929 	SEQ_PUT_HEX_FIELD(s, field->prev_prio);
930 	SEQ_PUT_HEX_FIELD(s, S);
931 	SEQ_PUT_HEX_FIELD(s, field->next_cpu);
932 	SEQ_PUT_HEX_FIELD(s, field->next_pid);
933 	SEQ_PUT_HEX_FIELD(s, field->next_prio);
934 	SEQ_PUT_HEX_FIELD(s, T);
935 
936 	return trace_handle_return(s);
937 }
938 
939 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
940 				       struct trace_event *event)
941 {
942 	return trace_ctxwake_hex(iter, 0);
943 }
944 
945 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
946 					struct trace_event *event)
947 {
948 	return trace_ctxwake_hex(iter, '+');
949 }
950 
951 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
952 					   int flags, struct trace_event *event)
953 {
954 	struct ctx_switch_entry *field;
955 	struct trace_seq *s = &iter->seq;
956 
957 	trace_assign_type(field, iter->ent);
958 
959 	SEQ_PUT_FIELD(s, field->prev_pid);
960 	SEQ_PUT_FIELD(s, field->prev_prio);
961 	SEQ_PUT_FIELD(s, field->prev_state);
962 	SEQ_PUT_FIELD(s, field->next_cpu);
963 	SEQ_PUT_FIELD(s, field->next_pid);
964 	SEQ_PUT_FIELD(s, field->next_prio);
965 	SEQ_PUT_FIELD(s, field->next_state);
966 
967 	return trace_handle_return(s);
968 }
969 
970 static struct trace_event_functions trace_ctx_funcs = {
971 	.trace		= trace_ctx_print,
972 	.raw		= trace_ctx_raw,
973 	.hex		= trace_ctx_hex,
974 	.binary		= trace_ctxwake_bin,
975 };
976 
977 static struct trace_event trace_ctx_event = {
978 	.type		= TRACE_CTX,
979 	.funcs		= &trace_ctx_funcs,
980 };
981 
982 static struct trace_event_functions trace_wake_funcs = {
983 	.trace		= trace_wake_print,
984 	.raw		= trace_wake_raw,
985 	.hex		= trace_wake_hex,
986 	.binary		= trace_ctxwake_bin,
987 };
988 
989 static struct trace_event trace_wake_event = {
990 	.type		= TRACE_WAKE,
991 	.funcs		= &trace_wake_funcs,
992 };
993 
994 /* TRACE_STACK */
995 
996 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
997 					   int flags, struct trace_event *event)
998 {
999 	struct stack_entry *field;
1000 	struct trace_seq *s = &iter->seq;
1001 	unsigned long *p;
1002 	unsigned long *end;
1003 
1004 	trace_assign_type(field, iter->ent);
1005 	end = (unsigned long *)((long)iter->ent + iter->ent_size);
1006 
1007 	trace_seq_puts(s, "<stack trace>\n");
1008 
1009 	for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1010 
1011 		if (trace_seq_has_overflowed(s))
1012 			break;
1013 
1014 		trace_seq_puts(s, " => ");
1015 		seq_print_ip_sym(s, *p, flags);
1016 		trace_seq_putc(s, '\n');
1017 	}
1018 
1019 	return trace_handle_return(s);
1020 }
1021 
1022 static struct trace_event_functions trace_stack_funcs = {
1023 	.trace		= trace_stack_print,
1024 };
1025 
1026 static struct trace_event trace_stack_event = {
1027 	.type		= TRACE_STACK,
1028 	.funcs		= &trace_stack_funcs,
1029 };
1030 
1031 /* TRACE_USER_STACK */
1032 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1033 						int flags, struct trace_event *event)
1034 {
1035 	struct userstack_entry *field;
1036 	struct trace_seq *s = &iter->seq;
1037 
1038 	trace_assign_type(field, iter->ent);
1039 
1040 	trace_seq_puts(s, "<user stack trace>\n");
1041 	seq_print_userip_objs(field, s, flags);
1042 
1043 	return trace_handle_return(s);
1044 }
1045 
1046 static struct trace_event_functions trace_user_stack_funcs = {
1047 	.trace		= trace_user_stack_print,
1048 };
1049 
1050 static struct trace_event trace_user_stack_event = {
1051 	.type		= TRACE_USER_STACK,
1052 	.funcs		= &trace_user_stack_funcs,
1053 };
1054 
1055 /* TRACE_BPUTS */
1056 static enum print_line_t
1057 trace_bputs_print(struct trace_iterator *iter, int flags,
1058 		   struct trace_event *event)
1059 {
1060 	struct trace_entry *entry = iter->ent;
1061 	struct trace_seq *s = &iter->seq;
1062 	struct bputs_entry *field;
1063 
1064 	trace_assign_type(field, entry);
1065 
1066 	seq_print_ip_sym(s, field->ip, flags);
1067 	trace_seq_puts(s, ": ");
1068 	trace_seq_puts(s, field->str);
1069 
1070 	return trace_handle_return(s);
1071 }
1072 
1073 
1074 static enum print_line_t
1075 trace_bputs_raw(struct trace_iterator *iter, int flags,
1076 		struct trace_event *event)
1077 {
1078 	struct bputs_entry *field;
1079 	struct trace_seq *s = &iter->seq;
1080 
1081 	trace_assign_type(field, iter->ent);
1082 
1083 	trace_seq_printf(s, ": %lx : ", field->ip);
1084 	trace_seq_puts(s, field->str);
1085 
1086 	return trace_handle_return(s);
1087 }
1088 
1089 static struct trace_event_functions trace_bputs_funcs = {
1090 	.trace		= trace_bputs_print,
1091 	.raw		= trace_bputs_raw,
1092 };
1093 
1094 static struct trace_event trace_bputs_event = {
1095 	.type		= TRACE_BPUTS,
1096 	.funcs		= &trace_bputs_funcs,
1097 };
1098 
1099 /* TRACE_BPRINT */
1100 static enum print_line_t
1101 trace_bprint_print(struct trace_iterator *iter, int flags,
1102 		   struct trace_event *event)
1103 {
1104 	struct trace_entry *entry = iter->ent;
1105 	struct trace_seq *s = &iter->seq;
1106 	struct bprint_entry *field;
1107 
1108 	trace_assign_type(field, entry);
1109 
1110 	seq_print_ip_sym(s, field->ip, flags);
1111 	trace_seq_puts(s, ": ");
1112 	trace_seq_bprintf(s, field->fmt, field->buf);
1113 
1114 	return trace_handle_return(s);
1115 }
1116 
1117 
1118 static enum print_line_t
1119 trace_bprint_raw(struct trace_iterator *iter, int flags,
1120 		 struct trace_event *event)
1121 {
1122 	struct bprint_entry *field;
1123 	struct trace_seq *s = &iter->seq;
1124 
1125 	trace_assign_type(field, iter->ent);
1126 
1127 	trace_seq_printf(s, ": %lx : ", field->ip);
1128 	trace_seq_bprintf(s, field->fmt, field->buf);
1129 
1130 	return trace_handle_return(s);
1131 }
1132 
1133 static struct trace_event_functions trace_bprint_funcs = {
1134 	.trace		= trace_bprint_print,
1135 	.raw		= trace_bprint_raw,
1136 };
1137 
1138 static struct trace_event trace_bprint_event = {
1139 	.type		= TRACE_BPRINT,
1140 	.funcs		= &trace_bprint_funcs,
1141 };
1142 
1143 /* TRACE_PRINT */
1144 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1145 					   int flags, struct trace_event *event)
1146 {
1147 	struct print_entry *field;
1148 	struct trace_seq *s = &iter->seq;
1149 
1150 	trace_assign_type(field, iter->ent);
1151 
1152 	seq_print_ip_sym(s, field->ip, flags);
1153 	trace_seq_printf(s, ": %s", field->buf);
1154 
1155 	return trace_handle_return(s);
1156 }
1157 
1158 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1159 					 struct trace_event *event)
1160 {
1161 	struct print_entry *field;
1162 
1163 	trace_assign_type(field, iter->ent);
1164 
1165 	trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1166 
1167 	return trace_handle_return(&iter->seq);
1168 }
1169 
1170 static struct trace_event_functions trace_print_funcs = {
1171 	.trace		= trace_print_print,
1172 	.raw		= trace_print_raw,
1173 };
1174 
1175 static struct trace_event trace_print_event = {
1176 	.type	 	= TRACE_PRINT,
1177 	.funcs		= &trace_print_funcs,
1178 };
1179 
1180 
1181 static struct trace_event *events[] __initdata = {
1182 	&trace_fn_event,
1183 	&trace_ctx_event,
1184 	&trace_wake_event,
1185 	&trace_stack_event,
1186 	&trace_user_stack_event,
1187 	&trace_bputs_event,
1188 	&trace_bprint_event,
1189 	&trace_print_event,
1190 	NULL
1191 };
1192 
1193 __init static int init_events(void)
1194 {
1195 	struct trace_event *event;
1196 	int i, ret;
1197 
1198 	for (i = 0; events[i]; i++) {
1199 		event = events[i];
1200 
1201 		ret = register_ftrace_event(event);
1202 		if (!ret) {
1203 			printk(KERN_WARNING "event %d failed to register\n",
1204 			       event->type);
1205 			WARN_ON_ONCE(1);
1206 		}
1207 	}
1208 
1209 	return 0;
1210 }
1211 early_initcall(init_events);
1212