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ia64: remove unnecessary sync_single_range_* in swiotlb_dma_ops
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / kernel / trace / trace_output.c
blobab13d7008061e7e06f97177a5fe4a51670e23ce9
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 DEFINE_PER_CPU(struct trace_seq, ftrace_event_seq);
20 EXPORT_PER_CPU_SYMBOL(ftrace_event_seq);
21
22 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
23
24 static int next_event_type = __TRACE_LAST_TYPE + 1;
25
26 int trace_print_seq(struct seq_file *m, struct trace_seq *s)
27 {
28 int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;
29 int ret;
30
31 ret = seq_write(m, s->buffer, len);
32
33 /*
34 * Only reset this buffer if we successfully wrote to the
35 * seq_file buffer.
36 */
37 if (!ret)
38 trace_seq_init(s);
39
40 return ret;
41 }
42
43 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
44 {
45 struct trace_seq *s = &iter->seq;
46 struct trace_entry *entry = iter->ent;
47 struct bprint_entry *field;
48 int ret;
49
50 trace_assign_type(field, entry);
51
52 ret = trace_seq_bprintf(s, field->fmt, field->buf);
53 if (!ret)
54 return TRACE_TYPE_PARTIAL_LINE;
55
56 return TRACE_TYPE_HANDLED;
57 }
58
59 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
60 {
61 struct trace_seq *s = &iter->seq;
62 struct trace_entry *entry = iter->ent;
63 struct print_entry *field;
64 int ret;
65
66 trace_assign_type(field, entry);
67
68 ret = trace_seq_printf(s, "%s", field->buf);
69 if (!ret)
70 return TRACE_TYPE_PARTIAL_LINE;
71
72 return TRACE_TYPE_HANDLED;
73 }
74
75 /**
76 * trace_seq_printf - sequence printing of trace information
77 * @s: trace sequence descriptor
78 * @fmt: printf format string
79 *
80 * It returns 0 if the trace oversizes the buffer's free
81 * space, 1 otherwise.
82 *
83 * The tracer may use either sequence operations or its own
84 * copy to user routines. To simplify formating of a trace
85 * trace_seq_printf is used to store strings into a special
86 * buffer (@s). Then the output may be either used by
87 * the sequencer or pulled into another buffer.
88 */
89 int
90 trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
91 {
92 int len = (PAGE_SIZE - 1) - s->len;
93 va_list ap;
94 int ret;
95
96 if (s->full || !len)
97 return 0;
98
99 va_start(ap, fmt);
100 ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
101 va_end(ap);
102
103 /* If we can't write it all, don't bother writing anything */
104 if (ret >= len) {
105 s->full = 1;
106 return 0;
107 }
108
109 s->len += ret;
110
111 return 1;
112 }
113 EXPORT_SYMBOL_GPL(trace_seq_printf);
114
115 /**
116 * trace_seq_vprintf - sequence printing of trace information
117 * @s: trace sequence descriptor
118 * @fmt: printf format string
119 *
120 * The tracer may use either sequence operations or its own
121 * copy to user routines. To simplify formating of a trace
122 * trace_seq_printf is used to store strings into a special
123 * buffer (@s). Then the output may be either used by
124 * the sequencer or pulled into another buffer.
125 */
126 int
127 trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
128 {
129 int len = (PAGE_SIZE - 1) - s->len;
130 int ret;
131
132 if (s->full || !len)
133 return 0;
134
135 ret = vsnprintf(s->buffer + s->len, len, fmt, args);
136
137 /* If we can't write it all, don't bother writing anything */
138 if (ret >= len) {
139 s->full = 1;
140 return 0;
141 }
142
143 s->len += ret;
144
145 return len;
146 }
147 EXPORT_SYMBOL_GPL(trace_seq_vprintf);
148
149 int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
150 {
151 int len = (PAGE_SIZE - 1) - s->len;
152 int ret;
153
154 if (s->full || !len)
155 return 0;
156
157 ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
158
159 /* If we can't write it all, don't bother writing anything */
160 if (ret >= len) {
161 s->full = 1;
162 return 0;
163 }
164
165 s->len += ret;
166
167 return len;
168 }
169
170 /**
171 * trace_seq_puts - trace sequence printing of simple string
172 * @s: trace sequence descriptor
173 * @str: simple string to record
174 *
175 * The tracer may use either the sequence operations or its own
176 * copy to user routines. This function records a simple string
177 * into a special buffer (@s) for later retrieval by a sequencer
178 * or other mechanism.
179 */
180 int trace_seq_puts(struct trace_seq *s, const char *str)
181 {
182 int len = strlen(str);
183
184 if (s->full)
185 return 0;
186
187 if (len > ((PAGE_SIZE - 1) - s->len)) {
188 s->full = 1;
189 return 0;
190 }
191
192 memcpy(s->buffer + s->len, str, len);
193 s->len += len;
194
195 return len;
196 }
197
198 int trace_seq_putc(struct trace_seq *s, unsigned char c)
199 {
200 if (s->full)
201 return 0;
202
203 if (s->len >= (PAGE_SIZE - 1)) {
204 s->full = 1;
205 return 0;
206 }
207
208 s->buffer[s->len++] = c;
209
210 return 1;
211 }
212 EXPORT_SYMBOL(trace_seq_putc);
213
214 int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
215 {
216 if (s->full)
217 return 0;
218
219 if (len > ((PAGE_SIZE - 1) - s->len)) {
220 s->full = 1;
221 return 0;
222 }
223
224 memcpy(s->buffer + s->len, mem, len);
225 s->len += len;
226
227 return len;
228 }
229
230 int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
231 {
232 unsigned char hex[HEX_CHARS];
233 const unsigned char *data = mem;
234 int i, j;
235
236 if (s->full)
237 return 0;
238
239 #ifdef __BIG_ENDIAN
240 for (i = 0, j = 0; i < len; i++) {
241 #else
242 for (i = len-1, j = 0; i >= 0; i--) {
243 #endif
244 hex[j++] = hex_asc_hi(data[i]);
245 hex[j++] = hex_asc_lo(data[i]);
246 }
247 hex[j++] = ' ';
248
249 return trace_seq_putmem(s, hex, j);
250 }
251
252 void *trace_seq_reserve(struct trace_seq *s, size_t len)
253 {
254 void *ret;
255
256 if (s->full)
257 return NULL;
258
259 if (len > ((PAGE_SIZE - 1) - s->len)) {
260 s->full = 1;
261 return NULL;
262 }
263
264 ret = s->buffer + s->len;
265 s->len += len;
266
267 return ret;
268 }
269
270 int trace_seq_path(struct trace_seq *s, struct path *path)
271 {
272 unsigned char *p;
273
274 if (s->full)
275 return 0;
276
277 if (s->len >= (PAGE_SIZE - 1)) {
278 s->full = 1;
279 return 0;
280 }
281
282 p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
283 if (!IS_ERR(p)) {
284 p = mangle_path(s->buffer + s->len, p, "\n");
285 if (p) {
286 s->len = p - s->buffer;
287 return 1;
288 }
289 } else {
290 s->buffer[s->len++] = '?';
291 return 1;
292 }
293
294 s->full = 1;
295 return 0;
296 }
297
298 const char *
299 ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
300 unsigned long flags,
301 const struct trace_print_flags *flag_array)
302 {
303 unsigned long mask;
304 const char *str;
305 const char *ret = p->buffer + p->len;
306 int i;
307
308 for (i = 0; flag_array[i].name && flags; i++) {
309
310 mask = flag_array[i].mask;
311 if ((flags & mask) != mask)
312 continue;
313
314 str = flag_array[i].name;
315 flags &= ~mask;
316 if (p->len && delim)
317 trace_seq_puts(p, delim);
318 trace_seq_puts(p, str);
319 }
320
321 /* check for left over flags */
322 if (flags) {
323 if (p->len && delim)
324 trace_seq_puts(p, delim);
325 trace_seq_printf(p, "0x%lx", flags);
326 }
327
328 trace_seq_putc(p, 0);
329
330 return ret;
331 }
332 EXPORT_SYMBOL(ftrace_print_flags_seq);
333
334 const char *
335 ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
336 const struct trace_print_flags *symbol_array)
337 {
338 int i;
339 const char *ret = p->buffer + p->len;
340
341 for (i = 0; symbol_array[i].name; i++) {
342
343 if (val != symbol_array[i].mask)
344 continue;
345
346 trace_seq_puts(p, symbol_array[i].name);
347 break;
348 }
349
350 if (!p->len)
351 trace_seq_printf(p, "0x%lx", val);
352
353 trace_seq_putc(p, 0);
354
355 return ret;
356 }
357 EXPORT_SYMBOL(ftrace_print_symbols_seq);
358
359 const char *
360 ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
361 {
362 int i;
363 const char *ret = p->buffer + p->len;
364
365 for (i = 0; i < buf_len; i++)
366 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
367
368 trace_seq_putc(p, 0);
369
370 return ret;
371 }
372 EXPORT_SYMBOL(ftrace_print_hex_seq);
373
374 #ifdef CONFIG_KRETPROBES
375 static inline const char *kretprobed(const char *name)
376 {
377 static const char tramp_name[] = "kretprobe_trampoline";
378 int size = sizeof(tramp_name);
379
380 if (strncmp(tramp_name, name, size) == 0)
381 return "[unknown/kretprobe'd]";
382 return name;
383 }
384 #else
385 static inline const char *kretprobed(const char *name)
386 {
387 return name;
388 }
389 #endif /* CONFIG_KRETPROBES */
390
391 static int
392 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
393 {
394 #ifdef CONFIG_KALLSYMS
395 char str[KSYM_SYMBOL_LEN];
396 const char *name;
397
398 kallsyms_lookup(address, NULL, NULL, NULL, str);
399
400 name = kretprobed(str);
401
402 return trace_seq_printf(s, fmt, name);
403 #endif
404 return 1;
405 }
406
407 static int
408 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
409 unsigned long address)
410 {
411 #ifdef CONFIG_KALLSYMS
412 char str[KSYM_SYMBOL_LEN];
413 const char *name;
414
415 sprint_symbol(str, address);
416 name = kretprobed(str);
417
418 return trace_seq_printf(s, fmt, name);
419 #endif
420 return 1;
421 }
422
423 #ifndef CONFIG_64BIT
424 # define IP_FMT "%08lx"
425 #else
426 # define IP_FMT "%016lx"
427 #endif
428
429 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
430 unsigned long ip, unsigned long sym_flags)
431 {
432 struct file *file = NULL;
433 unsigned long vmstart = 0;
434 int ret = 1;
435
436 if (s->full)
437 return 0;
438
439 if (mm) {
440 const struct vm_area_struct *vma;
441
442 down_read(&mm->mmap_sem);
443 vma = find_vma(mm, ip);
444 if (vma) {
445 file = vma->vm_file;
446 vmstart = vma->vm_start;
447 }
448 if (file) {
449 ret = trace_seq_path(s, &file->f_path);
450 if (ret)
451 ret = trace_seq_printf(s, "[+0x%lx]",
452 ip - vmstart);
453 }
454 up_read(&mm->mmap_sem);
455 }
456 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
457 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
458 return ret;
459 }
460
461 int
462 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
463 unsigned long sym_flags)
464 {
465 struct mm_struct *mm = NULL;
466 int ret = 1;
467 unsigned int i;
468
469 if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
470 struct task_struct *task;
471 /*
472 * we do the lookup on the thread group leader,
473 * since individual threads might have already quit!
474 */
475 rcu_read_lock();
476 task = find_task_by_vpid(entry->tgid);
477 if (task)
478 mm = get_task_mm(task);
479 rcu_read_unlock();
480 }
481
482 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
483 unsigned long ip = entry->caller[i];
484
485 if (ip == ULONG_MAX || !ret)
486 break;
487 if (ret)
488 ret = trace_seq_puts(s, " => ");
489 if (!ip) {
490 if (ret)
491 ret = trace_seq_puts(s, "??");
492 if (ret)
493 ret = trace_seq_puts(s, "\n");
494 continue;
495 }
496 if (!ret)
497 break;
498 if (ret)
499 ret = seq_print_user_ip(s, mm, ip, sym_flags);
500 ret = trace_seq_puts(s, "\n");
501 }
502
503 if (mm)
504 mmput(mm);
505 return ret;
506 }
507
508 int
509 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
510 {
511 int ret;
512
513 if (!ip)
514 return trace_seq_printf(s, "0");
515
516 if (sym_flags & TRACE_ITER_SYM_OFFSET)
517 ret = seq_print_sym_offset(s, "%s", ip);
518 else
519 ret = seq_print_sym_short(s, "%s", ip);
520
521 if (!ret)
522 return 0;
523
524 if (sym_flags & TRACE_ITER_SYM_ADDR)
525 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
526 return ret;
527 }
528
529 /**
530 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
531 * @s: trace seq struct to write to
532 * @entry: The trace entry field from the ring buffer
533 *
534 * Prints the generic fields of irqs off, in hard or softirq, preempt
535 * count and lock depth.
536 */
537 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
538 {
539 int hardirq, softirq;
540 int ret;
541
542 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
543 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
544
545 if (!trace_seq_printf(s, "%c%c%c",
546 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
547 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
548 'X' : '.',
549 (entry->flags & TRACE_FLAG_NEED_RESCHED) ?
550 'N' : '.',
551 (hardirq && softirq) ? 'H' :
552 hardirq ? 'h' : softirq ? 's' : '.'))
553 return 0;
554
555 if (entry->preempt_count)
556 ret = trace_seq_printf(s, "%x", entry->preempt_count);
557 else
558 ret = trace_seq_putc(s, '.');
559
560 if (!ret)
561 return 0;
562
563 if (entry->lock_depth < 0)
564 return trace_seq_putc(s, '.');
565
566 return trace_seq_printf(s, "%d", entry->lock_depth);
567 }
568
569 static int
570 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
571 {
572 char comm[TASK_COMM_LEN];
573
574 trace_find_cmdline(entry->pid, comm);
575
576 if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
577 comm, entry->pid, cpu))
578 return 0;
579
580 return trace_print_lat_fmt(s, entry);
581 }
582
583 static unsigned long preempt_mark_thresh = 100;
584
585 static int
586 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
587 unsigned long rel_usecs)
588 {
589 return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
590 rel_usecs > preempt_mark_thresh ? '!' :
591 rel_usecs > 1 ? '+' : ' ');
592 }
593
594 int trace_print_context(struct trace_iterator *iter)
595 {
596 struct trace_seq *s = &iter->seq;
597 struct trace_entry *entry = iter->ent;
598 unsigned long long t = ns2usecs(iter->ts);
599 unsigned long usec_rem = do_div(t, USEC_PER_SEC);
600 unsigned long secs = (unsigned long)t;
601 char comm[TASK_COMM_LEN];
602
603 trace_find_cmdline(entry->pid, comm);
604
605 return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
606 comm, entry->pid, iter->cpu, secs, usec_rem);
607 }
608
609 int trace_print_lat_context(struct trace_iterator *iter)
610 {
611 u64 next_ts;
612 int ret;
613 struct trace_seq *s = &iter->seq;
614 struct trace_entry *entry = iter->ent,
615 *next_entry = trace_find_next_entry(iter, NULL,
616 &next_ts);
617 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
618 unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
619 unsigned long rel_usecs;
620
621 if (!next_entry)
622 next_ts = iter->ts;
623 rel_usecs = ns2usecs(next_ts - iter->ts);
624
625 if (verbose) {
626 char comm[TASK_COMM_LEN];
627
628 trace_find_cmdline(entry->pid, comm);
629
630 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
631 " %ld.%03ldms (+%ld.%03ldms): ", comm,
632 entry->pid, iter->cpu, entry->flags,
633 entry->preempt_count, iter->idx,
634 ns2usecs(iter->ts),
635 abs_usecs / USEC_PER_MSEC,
636 abs_usecs % USEC_PER_MSEC,
637 rel_usecs / USEC_PER_MSEC,
638 rel_usecs % USEC_PER_MSEC);
639 } else {
640 ret = lat_print_generic(s, entry, iter->cpu);
641 if (ret)
642 ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
643 }
644
645 return ret;
646 }
647
648 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
649
650 static int task_state_char(unsigned long state)
651 {
652 int bit = state ? __ffs(state) + 1 : 0;
653
654 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
655 }
656
657 /**
658 * ftrace_find_event - find a registered event
659 * @type: the type of event to look for
660 *
661 * Returns an event of type @type otherwise NULL
662 * Called with trace_event_read_lock() held.
663 */
664 struct trace_event *ftrace_find_event(int type)
665 {
666 struct trace_event *event;
667 struct hlist_node *n;
668 unsigned key;
669
670 key = type & (EVENT_HASHSIZE - 1);
671
672 hlist_for_each_entry(event, n, &event_hash[key], node) {
673 if (event->type == type)
674 return event;
675 }
676
677 return NULL;
678 }
679
680 static LIST_HEAD(ftrace_event_list);
681
682 static int trace_search_list(struct list_head **list)
683 {
684 struct trace_event *e;
685 int last = __TRACE_LAST_TYPE;
686
687 if (list_empty(&ftrace_event_list)) {
688 *list = &ftrace_event_list;
689 return last + 1;
690 }
691
692 /*
693 * We used up all possible max events,
694 * lets see if somebody freed one.
695 */
696 list_for_each_entry(e, &ftrace_event_list, list) {
697 if (e->type != last + 1)
698 break;
699 last++;
700 }
701
702 /* Did we used up all 65 thousand events??? */
703 if ((last + 1) > FTRACE_MAX_EVENT)
704 return 0;
705
706 *list = &e->list;
707 return last + 1;
708 }
709
710 void trace_event_read_lock(void)
711 {
712 down_read(&trace_event_mutex);
713 }
714
715 void trace_event_read_unlock(void)
716 {
717 up_read(&trace_event_mutex);
718 }
719
720 /**
721 * register_ftrace_event - register output for an event type
722 * @event: the event type to register
723 *
724 * Event types are stored in a hash and this hash is used to
725 * find a way to print an event. If the @event->type is set
726 * then it will use that type, otherwise it will assign a
727 * type to use.
728 *
729 * If you assign your own type, please make sure it is added
730 * to the trace_type enum in trace.h, to avoid collisions
731 * with the dynamic types.
732 *
733 * Returns the event type number or zero on error.
734 */
735 int register_ftrace_event(struct trace_event *event)
736 {
737 unsigned key;
738 int ret = 0;
739
740 down_write(&trace_event_mutex);
741
742 if (WARN_ON(!event))
743 goto out;
744
745 INIT_LIST_HEAD(&event->list);
746
747 if (!event->type) {
748 struct list_head *list = NULL;
749
750 if (next_event_type > FTRACE_MAX_EVENT) {
751
752 event->type = trace_search_list(&list);
753 if (!event->type)
754 goto out;
755
756 } else {
757
758 event->type = next_event_type++;
759 list = &ftrace_event_list;
760 }
761
762 if (WARN_ON(ftrace_find_event(event->type)))
763 goto out;
764
765 list_add_tail(&event->list, list);
766
767 } else if (event->type > __TRACE_LAST_TYPE) {
768 printk(KERN_WARNING "Need to add type to trace.h\n");
769 WARN_ON(1);
770 goto out;
771 } else {
772 /* Is this event already used */
773 if (ftrace_find_event(event->type))
774 goto out;
775 }
776
777 if (event->trace == NULL)
778 event->trace = trace_nop_print;
779 if (event->raw == NULL)
780 event->raw = trace_nop_print;
781 if (event->hex == NULL)
782 event->hex = trace_nop_print;
783 if (event->binary == NULL)
784 event->binary = trace_nop_print;
785
786 key = event->type & (EVENT_HASHSIZE - 1);
787
788 hlist_add_head(&event->node, &event_hash[key]);
789
790 ret = event->type;
791 out:
792 up_write(&trace_event_mutex);
793
794 return ret;
795 }
796 EXPORT_SYMBOL_GPL(register_ftrace_event);
797
798 /*
799 * Used by module code with the trace_event_mutex held for write.
800 */
801 int __unregister_ftrace_event(struct trace_event *event)
802 {
803 hlist_del(&event->node);
804 list_del(&event->list);
805 return 0;
806 }
807
808 /**
809 * unregister_ftrace_event - remove a no longer used event
810 * @event: the event to remove
811 */
812 int unregister_ftrace_event(struct trace_event *event)
813 {
814 down_write(&trace_event_mutex);
815 __unregister_ftrace_event(event);
816 up_write(&trace_event_mutex);
817
818 return 0;
819 }
820 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
821
822 /*
823 * Standard events
824 */
825
826 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags)
827 {
828 return TRACE_TYPE_HANDLED;
829 }
830
831 /* TRACE_FN */
832 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags)
833 {
834 struct ftrace_entry *field;
835 struct trace_seq *s = &iter->seq;
836
837 trace_assign_type(field, iter->ent);
838
839 if (!seq_print_ip_sym(s, field->ip, flags))
840 goto partial;
841
842 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
843 if (!trace_seq_printf(s, " <-"))
844 goto partial;
845 if (!seq_print_ip_sym(s,
846 field->parent_ip,
847 flags))
848 goto partial;
849 }
850 if (!trace_seq_printf(s, "\n"))
851 goto partial;
852
853 return TRACE_TYPE_HANDLED;
854
855 partial:
856 return TRACE_TYPE_PARTIAL_LINE;
857 }
858
859 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags)
860 {
861 struct ftrace_entry *field;
862
863 trace_assign_type(field, iter->ent);
864
865 if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
866 field->ip,
867 field->parent_ip))
868 return TRACE_TYPE_PARTIAL_LINE;
869
870 return TRACE_TYPE_HANDLED;
871 }
872
873 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags)
874 {
875 struct ftrace_entry *field;
876 struct trace_seq *s = &iter->seq;
877
878 trace_assign_type(field, iter->ent);
879
880 SEQ_PUT_HEX_FIELD_RET(s, field->ip);
881 SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
882
883 return TRACE_TYPE_HANDLED;
884 }
885
886 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags)
887 {
888 struct ftrace_entry *field;
889 struct trace_seq *s = &iter->seq;
890
891 trace_assign_type(field, iter->ent);
892
893 SEQ_PUT_FIELD_RET(s, field->ip);
894 SEQ_PUT_FIELD_RET(s, field->parent_ip);
895
896 return TRACE_TYPE_HANDLED;
897 }
898
899 static struct trace_event trace_fn_event = {
900 .type = TRACE_FN,
901 .trace = trace_fn_trace,
902 .raw = trace_fn_raw,
903 .hex = trace_fn_hex,
904 .binary = trace_fn_bin,
905 };
906
907 /* TRACE_CTX an TRACE_WAKE */
908 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
909 char *delim)
910 {
911 struct ctx_switch_entry *field;
912 char comm[TASK_COMM_LEN];
913 int S, T;
914
915
916 trace_assign_type(field, iter->ent);
917
918 T = task_state_char(field->next_state);
919 S = task_state_char(field->prev_state);
920 trace_find_cmdline(field->next_pid, comm);
921 if (!trace_seq_printf(&iter->seq,
922 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
923 field->prev_pid,
924 field->prev_prio,
925 S, delim,
926 field->next_cpu,
927 field->next_pid,
928 field->next_prio,
929 T, comm))
930 return TRACE_TYPE_PARTIAL_LINE;
931
932 return TRACE_TYPE_HANDLED;
933 }
934
935 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags)
936 {
937 return trace_ctxwake_print(iter, "==>");
938 }
939
940 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
941 int flags)
942 {
943 return trace_ctxwake_print(iter, " +");
944 }
945
946 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
947 {
948 struct ctx_switch_entry *field;
949 int T;
950
951 trace_assign_type(field, iter->ent);
952
953 if (!S)
954 S = task_state_char(field->prev_state);
955 T = task_state_char(field->next_state);
956 if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
957 field->prev_pid,
958 field->prev_prio,
959 S,
960 field->next_cpu,
961 field->next_pid,
962 field->next_prio,
963 T))
964 return TRACE_TYPE_PARTIAL_LINE;
965
966 return TRACE_TYPE_HANDLED;
967 }
968
969 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags)
970 {
971 return trace_ctxwake_raw(iter, 0);
972 }
973
974 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags)
975 {
976 return trace_ctxwake_raw(iter, '+');
977 }
978
979
980 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
981 {
982 struct ctx_switch_entry *field;
983 struct trace_seq *s = &iter->seq;
984 int T;
985
986 trace_assign_type(field, iter->ent);
987
988 if (!S)
989 S = task_state_char(field->prev_state);
990 T = task_state_char(field->next_state);
991
992 SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
993 SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
994 SEQ_PUT_HEX_FIELD_RET(s, S);
995 SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
996 SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
997 SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
998 SEQ_PUT_HEX_FIELD_RET(s, T);
999
1000 return TRACE_TYPE_HANDLED;
1001 }
1002
1003 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags)
1004 {
1005 return trace_ctxwake_hex(iter, 0);
1006 }
1007
1008 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags)
1009 {
1010 return trace_ctxwake_hex(iter, '+');
1011 }
1012
1013 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1014 int flags)
1015 {
1016 struct ctx_switch_entry *field;
1017 struct trace_seq *s = &iter->seq;
1018
1019 trace_assign_type(field, iter->ent);
1020
1021 SEQ_PUT_FIELD_RET(s, field->prev_pid);
1022 SEQ_PUT_FIELD_RET(s, field->prev_prio);
1023 SEQ_PUT_FIELD_RET(s, field->prev_state);
1024 SEQ_PUT_FIELD_RET(s, field->next_pid);
1025 SEQ_PUT_FIELD_RET(s, field->next_prio);
1026 SEQ_PUT_FIELD_RET(s, field->next_state);
1027
1028 return TRACE_TYPE_HANDLED;
1029 }
1030
1031 static struct trace_event trace_ctx_event = {
1032 .type = TRACE_CTX,
1033 .trace = trace_ctx_print,
1034 .raw = trace_ctx_raw,
1035 .hex = trace_ctx_hex,
1036 .binary = trace_ctxwake_bin,
1037 };
1038
1039 static struct trace_event trace_wake_event = {
1040 .type = TRACE_WAKE,
1041 .trace = trace_wake_print,
1042 .raw = trace_wake_raw,
1043 .hex = trace_wake_hex,
1044 .binary = trace_ctxwake_bin,
1045 };
1046
1047 /* TRACE_SPECIAL */
1048 static enum print_line_t trace_special_print(struct trace_iterator *iter,
1049 int flags)
1050 {
1051 struct special_entry *field;
1052
1053 trace_assign_type(field, iter->ent);
1054
1055 if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
1056 field->arg1,
1057 field->arg2,
1058 field->arg3))
1059 return TRACE_TYPE_PARTIAL_LINE;
1060
1061 return TRACE_TYPE_HANDLED;
1062 }
1063
1064 static enum print_line_t trace_special_hex(struct trace_iterator *iter,
1065 int flags)
1066 {
1067 struct special_entry *field;
1068 struct trace_seq *s = &iter->seq;
1069
1070 trace_assign_type(field, iter->ent);
1071
1072 SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
1073 SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
1074 SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
1075
1076 return TRACE_TYPE_HANDLED;
1077 }
1078
1079 static enum print_line_t trace_special_bin(struct trace_iterator *iter,
1080 int flags)
1081 {
1082 struct special_entry *field;
1083 struct trace_seq *s = &iter->seq;
1084
1085 trace_assign_type(field, iter->ent);
1086
1087 SEQ_PUT_FIELD_RET(s, field->arg1);
1088 SEQ_PUT_FIELD_RET(s, field->arg2);
1089 SEQ_PUT_FIELD_RET(s, field->arg3);
1090
1091 return TRACE_TYPE_HANDLED;
1092 }
1093
1094 static struct trace_event trace_special_event = {
1095 .type = TRACE_SPECIAL,
1096 .trace = trace_special_print,
1097 .raw = trace_special_print,
1098 .hex = trace_special_hex,
1099 .binary = trace_special_bin,
1100 };
1101
1102 /* TRACE_STACK */
1103
1104 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1105 int flags)
1106 {
1107 struct stack_entry *field;
1108 struct trace_seq *s = &iter->seq;
1109 int i;
1110
1111 trace_assign_type(field, iter->ent);
1112
1113 if (!trace_seq_puts(s, "<stack trace>\n"))
1114 goto partial;
1115 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1116 if (!field->caller[i] || (field->caller[i] == ULONG_MAX))
1117 break;
1118 if (!trace_seq_puts(s, " => "))
1119 goto partial;
1120
1121 if (!seq_print_ip_sym(s, field->caller[i], flags))
1122 goto partial;
1123 if (!trace_seq_puts(s, "\n"))
1124 goto partial;
1125 }
1126
1127 return TRACE_TYPE_HANDLED;
1128
1129 partial:
1130 return TRACE_TYPE_PARTIAL_LINE;
1131 }
1132
1133 static struct trace_event trace_stack_event = {
1134 .type = TRACE_STACK,
1135 .trace = trace_stack_print,
1136 .raw = trace_special_print,
1137 .hex = trace_special_hex,
1138 .binary = trace_special_bin,
1139 };
1140
1141 /* TRACE_USER_STACK */
1142 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1143 int flags)
1144 {
1145 struct userstack_entry *field;
1146 struct trace_seq *s = &iter->seq;
1147
1148 trace_assign_type(field, iter->ent);
1149
1150 if (!trace_seq_puts(s, "<user stack trace>\n"))
1151 goto partial;
1152
1153 if (!seq_print_userip_objs(field, s, flags))
1154 goto partial;
1155
1156 return TRACE_TYPE_HANDLED;
1157
1158 partial:
1159 return TRACE_TYPE_PARTIAL_LINE;
1160 }
1161
1162 static struct trace_event trace_user_stack_event = {
1163 .type = TRACE_USER_STACK,
1164 .trace = trace_user_stack_print,
1165 .raw = trace_special_print,
1166 .hex = trace_special_hex,
1167 .binary = trace_special_bin,
1168 };
1169
1170 /* TRACE_BPRINT */
1171 static enum print_line_t
1172 trace_bprint_print(struct trace_iterator *iter, int flags)
1173 {
1174 struct trace_entry *entry = iter->ent;
1175 struct trace_seq *s = &iter->seq;
1176 struct bprint_entry *field;
1177
1178 trace_assign_type(field, entry);
1179
1180 if (!seq_print_ip_sym(s, field->ip, flags))
1181 goto partial;
1182
1183 if (!trace_seq_puts(s, ": "))
1184 goto partial;
1185
1186 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1187 goto partial;
1188
1189 return TRACE_TYPE_HANDLED;
1190
1191 partial:
1192 return TRACE_TYPE_PARTIAL_LINE;
1193 }
1194
1195
1196 static enum print_line_t
1197 trace_bprint_raw(struct trace_iterator *iter, int flags)
1198 {
1199 struct bprint_entry *field;
1200 struct trace_seq *s = &iter->seq;
1201
1202 trace_assign_type(field, iter->ent);
1203
1204 if (!trace_seq_printf(s, ": %lx : ", field->ip))
1205 goto partial;
1206
1207 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1208 goto partial;
1209
1210 return TRACE_TYPE_HANDLED;
1211
1212 partial:
1213 return TRACE_TYPE_PARTIAL_LINE;
1214 }
1215
1216
1217 static struct trace_event trace_bprint_event = {
1218 .type = TRACE_BPRINT,
1219 .trace = trace_bprint_print,
1220 .raw = trace_bprint_raw,
1221 };
1222
1223 /* TRACE_PRINT */
1224 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1225 int flags)
1226 {
1227 struct print_entry *field;
1228 struct trace_seq *s = &iter->seq;
1229
1230 trace_assign_type(field, iter->ent);
1231
1232 if (!seq_print_ip_sym(s, field->ip, flags))
1233 goto partial;
1234
1235 if (!trace_seq_printf(s, ": %s", field->buf))
1236 goto partial;
1237
1238 return TRACE_TYPE_HANDLED;
1239
1240 partial:
1241 return TRACE_TYPE_PARTIAL_LINE;
1242 }
1243
1244 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
1245 {
1246 struct print_entry *field;
1247
1248 trace_assign_type(field, iter->ent);
1249
1250 if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1251 goto partial;
1252
1253 return TRACE_TYPE_HANDLED;
1254
1255 partial:
1256 return TRACE_TYPE_PARTIAL_LINE;
1257 }
1258
1259 static struct trace_event trace_print_event = {
1260 .type = TRACE_PRINT,
1261 .trace = trace_print_print,
1262 .raw = trace_print_raw,
1263 };
1264
1265
1266 static struct trace_event *events[] __initdata = {
1267 &trace_fn_event,
1268 &trace_ctx_event,
1269 &trace_wake_event,
1270 &trace_special_event,
1271 &trace_stack_event,
1272 &trace_user_stack_event,
1273 &trace_bprint_event,
1274 &trace_print_event,
1275 NULL
1276 };
1277
1278 __init static int init_events(void)
1279 {
1280 struct trace_event *event;
1281 int i, ret;
1282
1283 for (i = 0; events[i]; i++) {
1284 event = events[i];
1285
1286 ret = register_ftrace_event(event);
1287 if (!ret) {
1288 printk(KERN_WARNING "event %d failed to register\n",
1289 event->type);
1290 WARN_ON_ONCE(1);
1291 }
1292 }
1293
1294 return 0;
1295 }
1296 device_initcall(init_events);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree