Merge branch 'tip/perf/core' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt...
[linux-2.6.git] / kernel / trace / trace_output.c
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
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
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
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
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
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
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  */
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
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
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
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 and lock depth.
533  */
534 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
535 {
536         int hardirq, softirq;
537         int ret;
538
539         hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
540         softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
541
542         if (!trace_seq_printf(s, "%c%c%c",
543                               (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
544                                 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
545                                   'X' : '.',
546                               (entry->flags & TRACE_FLAG_NEED_RESCHED) ?
547                                 'N' : '.',
548                               (hardirq && softirq) ? 'H' :
549                                 hardirq ? 'h' : softirq ? 's' : '.'))
550                 return 0;
551
552         if (entry->preempt_count)
553                 ret = trace_seq_printf(s, "%x", entry->preempt_count);
554         else
555                 ret = trace_seq_putc(s, '.');
556
557         if (!ret)
558                 return 0;
559
560         if (entry->lock_depth < 0)
561                 return trace_seq_putc(s, '.');
562
563         return trace_seq_printf(s, "%d", entry->lock_depth);
564 }
565
566 static int
567 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
568 {
569         char comm[TASK_COMM_LEN];
570
571         trace_find_cmdline(entry->pid, comm);
572
573         if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
574                               comm, entry->pid, cpu))
575                 return 0;
576
577         return trace_print_lat_fmt(s, entry);
578 }
579
580 static unsigned long preempt_mark_thresh = 100;
581
582 static int
583 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
584                     unsigned long rel_usecs)
585 {
586         return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
587                                 rel_usecs > preempt_mark_thresh ? '!' :
588                                   rel_usecs > 1 ? '+' : ' ');
589 }
590
591 int trace_print_context(struct trace_iterator *iter)
592 {
593         struct trace_seq *s = &iter->seq;
594         struct trace_entry *entry = iter->ent;
595         unsigned long long t = ns2usecs(iter->ts);
596         unsigned long usec_rem = do_div(t, USEC_PER_SEC);
597         unsigned long secs = (unsigned long)t;
598         char comm[TASK_COMM_LEN];
599
600         trace_find_cmdline(entry->pid, comm);
601
602         return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
603                                 comm, entry->pid, iter->cpu, secs, usec_rem);
604 }
605
606 int trace_print_lat_context(struct trace_iterator *iter)
607 {
608         u64 next_ts;
609         int ret;
610         struct trace_seq *s = &iter->seq;
611         struct trace_entry *entry = iter->ent,
612                            *next_entry = trace_find_next_entry(iter, NULL,
613                                                                &next_ts);
614         unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
615         unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
616         unsigned long rel_usecs;
617
618         if (!next_entry)
619                 next_ts = iter->ts;
620         rel_usecs = ns2usecs(next_ts - iter->ts);
621
622         if (verbose) {
623                 char comm[TASK_COMM_LEN];
624
625                 trace_find_cmdline(entry->pid, comm);
626
627                 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
628                                        " %ld.%03ldms (+%ld.%03ldms): ", comm,
629                                        entry->pid, iter->cpu, entry->flags,
630                                        entry->preempt_count, iter->idx,
631                                        ns2usecs(iter->ts),
632                                        abs_usecs / USEC_PER_MSEC,
633                                        abs_usecs % USEC_PER_MSEC,
634                                        rel_usecs / USEC_PER_MSEC,
635                                        rel_usecs % USEC_PER_MSEC);
636         } else {
637                 ret = lat_print_generic(s, entry, iter->cpu);
638                 if (ret)
639                         ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
640         }
641
642         return ret;
643 }
644
645 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
646
647 static int task_state_char(unsigned long state)
648 {
649         int bit = state ? __ffs(state) + 1 : 0;
650
651         return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
652 }
653
654 /**
655  * ftrace_find_event - find a registered event
656  * @type: the type of event to look for
657  *
658  * Returns an event of type @type otherwise NULL
659  * Called with trace_event_read_lock() held.
660  */
661 struct trace_event *ftrace_find_event(int type)
662 {
663         struct trace_event *event;
664         struct hlist_node *n;
665         unsigned key;
666
667         key = type & (EVENT_HASHSIZE - 1);
668
669         hlist_for_each_entry(event, n, &event_hash[key], node) {
670                 if (event->type == type)
671                         return event;
672         }
673
674         return NULL;
675 }
676
677 static LIST_HEAD(ftrace_event_list);
678
679 static int trace_search_list(struct list_head **list)
680 {
681         struct trace_event *e;
682         int last = __TRACE_LAST_TYPE;
683
684         if (list_empty(&ftrace_event_list)) {
685                 *list = &ftrace_event_list;
686                 return last + 1;
687         }
688
689         /*
690          * We used up all possible max events,
691          * lets see if somebody freed one.
692          */
693         list_for_each_entry(e, &ftrace_event_list, list) {
694                 if (e->type != last + 1)
695                         break;
696                 last++;
697         }
698
699         /* Did we used up all 65 thousand events??? */
700         if ((last + 1) > FTRACE_MAX_EVENT)
701                 return 0;
702
703         *list = &e->list;
704         return last + 1;
705 }
706
707 void trace_event_read_lock(void)
708 {
709         down_read(&trace_event_mutex);
710 }
711
712 void trace_event_read_unlock(void)
713 {
714         up_read(&trace_event_mutex);
715 }
716
717 /**
718  * register_ftrace_event - register output for an event type
719  * @event: the event type to register
720  *
721  * Event types are stored in a hash and this hash is used to
722  * find a way to print an event. If the @event->type is set
723  * then it will use that type, otherwise it will assign a
724  * type to use.
725  *
726  * If you assign your own type, please make sure it is added
727  * to the trace_type enum in trace.h, to avoid collisions
728  * with the dynamic types.
729  *
730  * Returns the event type number or zero on error.
731  */
732 int register_ftrace_event(struct trace_event *event)
733 {
734         unsigned key;
735         int ret = 0;
736
737         down_write(&trace_event_mutex);
738
739         if (WARN_ON(!event))
740                 goto out;
741
742         if (WARN_ON(!event->funcs))
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->funcs->trace == NULL)
778                 event->funcs->trace = trace_nop_print;
779         if (event->funcs->raw == NULL)
780                 event->funcs->raw = trace_nop_print;
781         if (event->funcs->hex == NULL)
782                 event->funcs->hex = trace_nop_print;
783         if (event->funcs->binary == NULL)
784                 event->funcs->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                                   struct trace_event *event)
828 {
829         return TRACE_TYPE_HANDLED;
830 }
831
832 /* TRACE_FN */
833 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
834                                         struct trace_event *event)
835 {
836         struct ftrace_entry *field;
837         struct trace_seq *s = &iter->seq;
838
839         trace_assign_type(field, iter->ent);
840
841         if (!seq_print_ip_sym(s, field->ip, flags))
842                 goto partial;
843
844         if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
845                 if (!trace_seq_printf(s, " <-"))
846                         goto partial;
847                 if (!seq_print_ip_sym(s,
848                                       field->parent_ip,
849                                       flags))
850                         goto partial;
851         }
852         if (!trace_seq_printf(s, "\n"))
853                 goto partial;
854
855         return TRACE_TYPE_HANDLED;
856
857  partial:
858         return TRACE_TYPE_PARTIAL_LINE;
859 }
860
861 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
862                                       struct trace_event *event)
863 {
864         struct ftrace_entry *field;
865
866         trace_assign_type(field, iter->ent);
867
868         if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
869                               field->ip,
870                               field->parent_ip))
871                 return TRACE_TYPE_PARTIAL_LINE;
872
873         return TRACE_TYPE_HANDLED;
874 }
875
876 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
877                                       struct trace_event *event)
878 {
879         struct ftrace_entry *field;
880         struct trace_seq *s = &iter->seq;
881
882         trace_assign_type(field, iter->ent);
883
884         SEQ_PUT_HEX_FIELD_RET(s, field->ip);
885         SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
886
887         return TRACE_TYPE_HANDLED;
888 }
889
890 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
891                                       struct trace_event *event)
892 {
893         struct ftrace_entry *field;
894         struct trace_seq *s = &iter->seq;
895
896         trace_assign_type(field, iter->ent);
897
898         SEQ_PUT_FIELD_RET(s, field->ip);
899         SEQ_PUT_FIELD_RET(s, field->parent_ip);
900
901         return TRACE_TYPE_HANDLED;
902 }
903
904 static struct trace_event_functions trace_fn_funcs = {
905         .trace          = trace_fn_trace,
906         .raw            = trace_fn_raw,
907         .hex            = trace_fn_hex,
908         .binary         = trace_fn_bin,
909 };
910
911 static struct trace_event trace_fn_event = {
912         .type           = TRACE_FN,
913         .funcs          = &trace_fn_funcs,
914 };
915
916 /* TRACE_CTX an TRACE_WAKE */
917 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
918                                              char *delim)
919 {
920         struct ctx_switch_entry *field;
921         char comm[TASK_COMM_LEN];
922         int S, T;
923
924
925         trace_assign_type(field, iter->ent);
926
927         T = task_state_char(field->next_state);
928         S = task_state_char(field->prev_state);
929         trace_find_cmdline(field->next_pid, comm);
930         if (!trace_seq_printf(&iter->seq,
931                               " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
932                               field->prev_pid,
933                               field->prev_prio,
934                               S, delim,
935                               field->next_cpu,
936                               field->next_pid,
937                               field->next_prio,
938                               T, comm))
939                 return TRACE_TYPE_PARTIAL_LINE;
940
941         return TRACE_TYPE_HANDLED;
942 }
943
944 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
945                                          struct trace_event *event)
946 {
947         return trace_ctxwake_print(iter, "==>");
948 }
949
950 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
951                                           int flags, struct trace_event *event)
952 {
953         return trace_ctxwake_print(iter, "  +");
954 }
955
956 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
957 {
958         struct ctx_switch_entry *field;
959         int T;
960
961         trace_assign_type(field, iter->ent);
962
963         if (!S)
964                 S = task_state_char(field->prev_state);
965         T = task_state_char(field->next_state);
966         if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
967                               field->prev_pid,
968                               field->prev_prio,
969                               S,
970                               field->next_cpu,
971                               field->next_pid,
972                               field->next_prio,
973                               T))
974                 return TRACE_TYPE_PARTIAL_LINE;
975
976         return TRACE_TYPE_HANDLED;
977 }
978
979 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
980                                        struct trace_event *event)
981 {
982         return trace_ctxwake_raw(iter, 0);
983 }
984
985 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
986                                         struct trace_event *event)
987 {
988         return trace_ctxwake_raw(iter, '+');
989 }
990
991
992 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
993 {
994         struct ctx_switch_entry *field;
995         struct trace_seq *s = &iter->seq;
996         int T;
997
998         trace_assign_type(field, iter->ent);
999
1000         if (!S)
1001                 S = task_state_char(field->prev_state);
1002         T = task_state_char(field->next_state);
1003
1004         SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
1005         SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
1006         SEQ_PUT_HEX_FIELD_RET(s, S);
1007         SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
1008         SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
1009         SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
1010         SEQ_PUT_HEX_FIELD_RET(s, T);
1011
1012         return TRACE_TYPE_HANDLED;
1013 }
1014
1015 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1016                                        struct trace_event *event)
1017 {
1018         return trace_ctxwake_hex(iter, 0);
1019 }
1020
1021 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1022                                         struct trace_event *event)
1023 {
1024         return trace_ctxwake_hex(iter, '+');
1025 }
1026
1027 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1028                                            int flags, struct trace_event *event)
1029 {
1030         struct ctx_switch_entry *field;
1031         struct trace_seq *s = &iter->seq;
1032
1033         trace_assign_type(field, iter->ent);
1034
1035         SEQ_PUT_FIELD_RET(s, field->prev_pid);
1036         SEQ_PUT_FIELD_RET(s, field->prev_prio);
1037         SEQ_PUT_FIELD_RET(s, field->prev_state);
1038         SEQ_PUT_FIELD_RET(s, field->next_pid);
1039         SEQ_PUT_FIELD_RET(s, field->next_prio);
1040         SEQ_PUT_FIELD_RET(s, field->next_state);
1041
1042         return TRACE_TYPE_HANDLED;
1043 }
1044
1045 static struct trace_event_functions trace_ctx_funcs = {
1046         .trace          = trace_ctx_print,
1047         .raw            = trace_ctx_raw,
1048         .hex            = trace_ctx_hex,
1049         .binary         = trace_ctxwake_bin,
1050 };
1051
1052 static struct trace_event trace_ctx_event = {
1053         .type           = TRACE_CTX,
1054         .funcs          = &trace_ctx_funcs,
1055 };
1056
1057 static struct trace_event_functions trace_wake_funcs = {
1058         .trace          = trace_wake_print,
1059         .raw            = trace_wake_raw,
1060         .hex            = trace_wake_hex,
1061         .binary         = trace_ctxwake_bin,
1062 };
1063
1064 static struct trace_event trace_wake_event = {
1065         .type           = TRACE_WAKE,
1066         .funcs          = &trace_wake_funcs,
1067 };
1068
1069 /* TRACE_STACK */
1070
1071 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1072                                            int flags, struct trace_event *event)
1073 {
1074         struct stack_entry *field;
1075         struct trace_seq *s = &iter->seq;
1076         int i;
1077
1078         trace_assign_type(field, iter->ent);
1079
1080         if (!trace_seq_puts(s, "<stack trace>\n"))
1081                 goto partial;
1082         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1083                 if (!field->caller[i] || (field->caller[i] == ULONG_MAX))
1084                         break;
1085                 if (!trace_seq_puts(s, " => "))
1086                         goto partial;
1087
1088                 if (!seq_print_ip_sym(s, field->caller[i], flags))
1089                         goto partial;
1090                 if (!trace_seq_puts(s, "\n"))
1091                         goto partial;
1092         }
1093
1094         return TRACE_TYPE_HANDLED;
1095
1096  partial:
1097         return TRACE_TYPE_PARTIAL_LINE;
1098 }
1099
1100 static struct trace_event_functions trace_stack_funcs = {
1101         .trace          = trace_stack_print,
1102 };
1103
1104 static struct trace_event trace_stack_event = {
1105         .type           = TRACE_STACK,
1106         .funcs          = &trace_stack_funcs,
1107 };
1108
1109 /* TRACE_USER_STACK */
1110 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1111                                                 int flags, struct trace_event *event)
1112 {
1113         struct userstack_entry *field;
1114         struct trace_seq *s = &iter->seq;
1115
1116         trace_assign_type(field, iter->ent);
1117
1118         if (!trace_seq_puts(s, "<user stack trace>\n"))
1119                 goto partial;
1120
1121         if (!seq_print_userip_objs(field, s, flags))
1122                 goto partial;
1123
1124         return TRACE_TYPE_HANDLED;
1125
1126  partial:
1127         return TRACE_TYPE_PARTIAL_LINE;
1128 }
1129
1130 static struct trace_event_functions trace_user_stack_funcs = {
1131         .trace          = trace_user_stack_print,
1132 };
1133
1134 static struct trace_event trace_user_stack_event = {
1135         .type           = TRACE_USER_STACK,
1136         .funcs          = &trace_user_stack_funcs,
1137 };
1138
1139 /* TRACE_BPRINT */
1140 static enum print_line_t
1141 trace_bprint_print(struct trace_iterator *iter, int flags,
1142                    struct trace_event *event)
1143 {
1144         struct trace_entry *entry = iter->ent;
1145         struct trace_seq *s = &iter->seq;
1146         struct bprint_entry *field;
1147
1148         trace_assign_type(field, entry);
1149
1150         if (!seq_print_ip_sym(s, field->ip, flags))
1151                 goto partial;
1152
1153         if (!trace_seq_puts(s, ": "))
1154                 goto partial;
1155
1156         if (!trace_seq_bprintf(s, field->fmt, field->buf))
1157                 goto partial;
1158
1159         return TRACE_TYPE_HANDLED;
1160
1161  partial:
1162         return TRACE_TYPE_PARTIAL_LINE;
1163 }
1164
1165
1166 static enum print_line_t
1167 trace_bprint_raw(struct trace_iterator *iter, int flags,
1168                  struct trace_event *event)
1169 {
1170         struct bprint_entry *field;
1171         struct trace_seq *s = &iter->seq;
1172
1173         trace_assign_type(field, iter->ent);
1174
1175         if (!trace_seq_printf(s, ": %lx : ", field->ip))
1176                 goto partial;
1177
1178         if (!trace_seq_bprintf(s, field->fmt, field->buf))
1179                 goto partial;
1180
1181         return TRACE_TYPE_HANDLED;
1182
1183  partial:
1184         return TRACE_TYPE_PARTIAL_LINE;
1185 }
1186
1187 static struct trace_event_functions trace_bprint_funcs = {
1188         .trace          = trace_bprint_print,
1189         .raw            = trace_bprint_raw,
1190 };
1191
1192 static struct trace_event trace_bprint_event = {
1193         .type           = TRACE_BPRINT,
1194         .funcs          = &trace_bprint_funcs,
1195 };
1196
1197 /* TRACE_PRINT */
1198 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1199                                            int flags, struct trace_event *event)
1200 {
1201         struct print_entry *field;
1202         struct trace_seq *s = &iter->seq;
1203
1204         trace_assign_type(field, iter->ent);
1205
1206         if (!seq_print_ip_sym(s, field->ip, flags))
1207                 goto partial;
1208
1209         if (!trace_seq_printf(s, ": %s", field->buf))
1210                 goto partial;
1211
1212         return TRACE_TYPE_HANDLED;
1213
1214  partial:
1215         return TRACE_TYPE_PARTIAL_LINE;
1216 }
1217
1218 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1219                                          struct trace_event *event)
1220 {
1221         struct print_entry *field;
1222
1223         trace_assign_type(field, iter->ent);
1224
1225         if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1226                 goto partial;
1227
1228         return TRACE_TYPE_HANDLED;
1229
1230  partial:
1231         return TRACE_TYPE_PARTIAL_LINE;
1232 }
1233
1234 static struct trace_event_functions trace_print_funcs = {
1235         .trace          = trace_print_print,
1236         .raw            = trace_print_raw,
1237 };
1238
1239 static struct trace_event trace_print_event = {
1240         .type           = TRACE_PRINT,
1241         .funcs          = &trace_print_funcs,
1242 };
1243
1244
1245 static struct trace_event *events[] __initdata = {
1246         &trace_fn_event,
1247         &trace_ctx_event,
1248         &trace_wake_event,
1249         &trace_stack_event,
1250         &trace_user_stack_event,
1251         &trace_bprint_event,
1252         &trace_print_event,
1253         NULL
1254 };
1255
1256 __init static int init_events(void)
1257 {
1258         struct trace_event *event;
1259         int i, ret;
1260
1261         for (i = 0; events[i]; i++) {
1262                 event = events[i];
1263
1264                 ret = register_ftrace_event(event);
1265                 if (!ret) {
1266                         printk(KERN_WARNING "event %d failed to register\n",
1267                                event->type);
1268                         WARN_ON_ONCE(1);
1269                 }
1270         }
1271
1272         return 0;
1273 }
1274 device_initcall(init_events);