tracing: Adjust conditional expression latency formatting.
[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.
533  */
534 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
535 {
536         char hardsoft_irq;
537         char need_resched;
538         char irqs_off;
539         int hardirq;
540         int softirq;
541         int ret;
542
543         hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
544         softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
545
546         irqs_off =
547                 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
548                 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
549                 '.';
550         need_resched =
551                 (entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.';
552         hardsoft_irq =
553                 (hardirq && softirq) ? 'H' :
554                 hardirq ? 'h' :
555                 softirq ? 's' :
556                 '.';
557
558         if (!trace_seq_printf(s, "%c%c%c",
559                               irqs_off, need_resched, hardsoft_irq))
560                 return 0;
561
562         if (entry->preempt_count)
563                 ret = trace_seq_printf(s, "%x", entry->preempt_count);
564         else
565                 ret = trace_seq_putc(s, '.');
566
567         return ret;
568 }
569
570 static int
571 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
572 {
573         char comm[TASK_COMM_LEN];
574
575         trace_find_cmdline(entry->pid, comm);
576
577         if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
578                               comm, entry->pid, cpu))
579                 return 0;
580
581         return trace_print_lat_fmt(s, entry);
582 }
583
584 static unsigned long preempt_mark_thresh = 100;
585
586 static int
587 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
588                     unsigned long rel_usecs)
589 {
590         return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
591                                 rel_usecs > preempt_mark_thresh ? '!' :
592                                   rel_usecs > 1 ? '+' : ' ');
593 }
594
595 int trace_print_context(struct trace_iterator *iter)
596 {
597         struct trace_seq *s = &iter->seq;
598         struct trace_entry *entry = iter->ent;
599         unsigned long long t = ns2usecs(iter->ts);
600         unsigned long usec_rem = do_div(t, USEC_PER_SEC);
601         unsigned long secs = (unsigned long)t;
602         char comm[TASK_COMM_LEN];
603
604         trace_find_cmdline(entry->pid, comm);
605
606         return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
607                                 comm, entry->pid, iter->cpu, secs, usec_rem);
608 }
609
610 int trace_print_lat_context(struct trace_iterator *iter)
611 {
612         u64 next_ts;
613         int ret;
614         struct trace_seq *s = &iter->seq;
615         struct trace_entry *entry = iter->ent,
616                            *next_entry = trace_find_next_entry(iter, NULL,
617                                                                &next_ts);
618         unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
619         unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
620         unsigned long rel_usecs;
621
622         if (!next_entry)
623                 next_ts = iter->ts;
624         rel_usecs = ns2usecs(next_ts - iter->ts);
625
626         if (verbose) {
627                 char comm[TASK_COMM_LEN];
628
629                 trace_find_cmdline(entry->pid, comm);
630
631                 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
632                                        " %ld.%03ldms (+%ld.%03ldms): ", comm,
633                                        entry->pid, iter->cpu, entry->flags,
634                                        entry->preempt_count, iter->idx,
635                                        ns2usecs(iter->ts),
636                                        abs_usecs / USEC_PER_MSEC,
637                                        abs_usecs % USEC_PER_MSEC,
638                                        rel_usecs / USEC_PER_MSEC,
639                                        rel_usecs % USEC_PER_MSEC);
640         } else {
641                 ret = lat_print_generic(s, entry, iter->cpu);
642                 if (ret)
643                         ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
644         }
645
646         return ret;
647 }
648
649 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
650
651 static int task_state_char(unsigned long state)
652 {
653         int bit = state ? __ffs(state) + 1 : 0;
654
655         return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
656 }
657
658 /**
659  * ftrace_find_event - find a registered event
660  * @type: the type of event to look for
661  *
662  * Returns an event of type @type otherwise NULL
663  * Called with trace_event_read_lock() held.
664  */
665 struct trace_event *ftrace_find_event(int type)
666 {
667         struct trace_event *event;
668         struct hlist_node *n;
669         unsigned key;
670
671         key = type & (EVENT_HASHSIZE - 1);
672
673         hlist_for_each_entry(event, n, &event_hash[key], node) {
674                 if (event->type == type)
675                         return event;
676         }
677
678         return NULL;
679 }
680
681 static LIST_HEAD(ftrace_event_list);
682
683 static int trace_search_list(struct list_head **list)
684 {
685         struct trace_event *e;
686         int last = __TRACE_LAST_TYPE;
687
688         if (list_empty(&ftrace_event_list)) {
689                 *list = &ftrace_event_list;
690                 return last + 1;
691         }
692
693         /*
694          * We used up all possible max events,
695          * lets see if somebody freed one.
696          */
697         list_for_each_entry(e, &ftrace_event_list, list) {
698                 if (e->type != last + 1)
699                         break;
700                 last++;
701         }
702
703         /* Did we used up all 65 thousand events??? */
704         if ((last + 1) > FTRACE_MAX_EVENT)
705                 return 0;
706
707         *list = &e->list;
708         return last + 1;
709 }
710
711 void trace_event_read_lock(void)
712 {
713         down_read(&trace_event_mutex);
714 }
715
716 void trace_event_read_unlock(void)
717 {
718         up_read(&trace_event_mutex);
719 }
720
721 /**
722  * register_ftrace_event - register output for an event type
723  * @event: the event type to register
724  *
725  * Event types are stored in a hash and this hash is used to
726  * find a way to print an event. If the @event->type is set
727  * then it will use that type, otherwise it will assign a
728  * type to use.
729  *
730  * If you assign your own type, please make sure it is added
731  * to the trace_type enum in trace.h, to avoid collisions
732  * with the dynamic types.
733  *
734  * Returns the event type number or zero on error.
735  */
736 int register_ftrace_event(struct trace_event *event)
737 {
738         unsigned key;
739         int ret = 0;
740
741         down_write(&trace_event_mutex);
742
743         if (WARN_ON(!event))
744                 goto out;
745
746         if (WARN_ON(!event->funcs))
747                 goto out;
748
749         INIT_LIST_HEAD(&event->list);
750
751         if (!event->type) {
752                 struct list_head *list = NULL;
753
754                 if (next_event_type > FTRACE_MAX_EVENT) {
755
756                         event->type = trace_search_list(&list);
757                         if (!event->type)
758                                 goto out;
759
760                 } else {
761                         
762                         event->type = next_event_type++;
763                         list = &ftrace_event_list;
764                 }
765
766                 if (WARN_ON(ftrace_find_event(event->type)))
767                         goto out;
768
769                 list_add_tail(&event->list, list);
770
771         } else if (event->type > __TRACE_LAST_TYPE) {
772                 printk(KERN_WARNING "Need to add type to trace.h\n");
773                 WARN_ON(1);
774                 goto out;
775         } else {
776                 /* Is this event already used */
777                 if (ftrace_find_event(event->type))
778                         goto out;
779         }
780
781         if (event->funcs->trace == NULL)
782                 event->funcs->trace = trace_nop_print;
783         if (event->funcs->raw == NULL)
784                 event->funcs->raw = trace_nop_print;
785         if (event->funcs->hex == NULL)
786                 event->funcs->hex = trace_nop_print;
787         if (event->funcs->binary == NULL)
788                 event->funcs->binary = trace_nop_print;
789
790         key = event->type & (EVENT_HASHSIZE - 1);
791
792         hlist_add_head(&event->node, &event_hash[key]);
793
794         ret = event->type;
795  out:
796         up_write(&trace_event_mutex);
797
798         return ret;
799 }
800 EXPORT_SYMBOL_GPL(register_ftrace_event);
801
802 /*
803  * Used by module code with the trace_event_mutex held for write.
804  */
805 int __unregister_ftrace_event(struct trace_event *event)
806 {
807         hlist_del(&event->node);
808         list_del(&event->list);
809         return 0;
810 }
811
812 /**
813  * unregister_ftrace_event - remove a no longer used event
814  * @event: the event to remove
815  */
816 int unregister_ftrace_event(struct trace_event *event)
817 {
818         down_write(&trace_event_mutex);
819         __unregister_ftrace_event(event);
820         up_write(&trace_event_mutex);
821
822         return 0;
823 }
824 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
825
826 /*
827  * Standard events
828  */
829
830 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
831                                   struct trace_event *event)
832 {
833         return TRACE_TYPE_HANDLED;
834 }
835
836 /* TRACE_FN */
837 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
838                                         struct trace_event *event)
839 {
840         struct ftrace_entry *field;
841         struct trace_seq *s = &iter->seq;
842
843         trace_assign_type(field, iter->ent);
844
845         if (!seq_print_ip_sym(s, field->ip, flags))
846                 goto partial;
847
848         if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
849                 if (!trace_seq_printf(s, " <-"))
850                         goto partial;
851                 if (!seq_print_ip_sym(s,
852                                       field->parent_ip,
853                                       flags))
854                         goto partial;
855         }
856         if (!trace_seq_printf(s, "\n"))
857                 goto partial;
858
859         return TRACE_TYPE_HANDLED;
860
861  partial:
862         return TRACE_TYPE_PARTIAL_LINE;
863 }
864
865 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
866                                       struct trace_event *event)
867 {
868         struct ftrace_entry *field;
869
870         trace_assign_type(field, iter->ent);
871
872         if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
873                               field->ip,
874                               field->parent_ip))
875                 return TRACE_TYPE_PARTIAL_LINE;
876
877         return TRACE_TYPE_HANDLED;
878 }
879
880 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
881                                       struct trace_event *event)
882 {
883         struct ftrace_entry *field;
884         struct trace_seq *s = &iter->seq;
885
886         trace_assign_type(field, iter->ent);
887
888         SEQ_PUT_HEX_FIELD_RET(s, field->ip);
889         SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
890
891         return TRACE_TYPE_HANDLED;
892 }
893
894 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
895                                       struct trace_event *event)
896 {
897         struct ftrace_entry *field;
898         struct trace_seq *s = &iter->seq;
899
900         trace_assign_type(field, iter->ent);
901
902         SEQ_PUT_FIELD_RET(s, field->ip);
903         SEQ_PUT_FIELD_RET(s, field->parent_ip);
904
905         return TRACE_TYPE_HANDLED;
906 }
907
908 static struct trace_event_functions trace_fn_funcs = {
909         .trace          = trace_fn_trace,
910         .raw            = trace_fn_raw,
911         .hex            = trace_fn_hex,
912         .binary         = trace_fn_bin,
913 };
914
915 static struct trace_event trace_fn_event = {
916         .type           = TRACE_FN,
917         .funcs          = &trace_fn_funcs,
918 };
919
920 /* TRACE_CTX an TRACE_WAKE */
921 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
922                                              char *delim)
923 {
924         struct ctx_switch_entry *field;
925         char comm[TASK_COMM_LEN];
926         int S, T;
927
928
929         trace_assign_type(field, iter->ent);
930
931         T = task_state_char(field->next_state);
932         S = task_state_char(field->prev_state);
933         trace_find_cmdline(field->next_pid, comm);
934         if (!trace_seq_printf(&iter->seq,
935                               " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
936                               field->prev_pid,
937                               field->prev_prio,
938                               S, delim,
939                               field->next_cpu,
940                               field->next_pid,
941                               field->next_prio,
942                               T, comm))
943                 return TRACE_TYPE_PARTIAL_LINE;
944
945         return TRACE_TYPE_HANDLED;
946 }
947
948 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
949                                          struct trace_event *event)
950 {
951         return trace_ctxwake_print(iter, "==>");
952 }
953
954 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
955                                           int flags, struct trace_event *event)
956 {
957         return trace_ctxwake_print(iter, "  +");
958 }
959
960 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
961 {
962         struct ctx_switch_entry *field;
963         int T;
964
965         trace_assign_type(field, iter->ent);
966
967         if (!S)
968                 S = task_state_char(field->prev_state);
969         T = task_state_char(field->next_state);
970         if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
971                               field->prev_pid,
972                               field->prev_prio,
973                               S,
974                               field->next_cpu,
975                               field->next_pid,
976                               field->next_prio,
977                               T))
978                 return TRACE_TYPE_PARTIAL_LINE;
979
980         return TRACE_TYPE_HANDLED;
981 }
982
983 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
984                                        struct trace_event *event)
985 {
986         return trace_ctxwake_raw(iter, 0);
987 }
988
989 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
990                                         struct trace_event *event)
991 {
992         return trace_ctxwake_raw(iter, '+');
993 }
994
995
996 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
997 {
998         struct ctx_switch_entry *field;
999         struct trace_seq *s = &iter->seq;
1000         int T;
1001
1002         trace_assign_type(field, iter->ent);
1003
1004         if (!S)
1005                 S = task_state_char(field->prev_state);
1006         T = task_state_char(field->next_state);
1007
1008         SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
1009         SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
1010         SEQ_PUT_HEX_FIELD_RET(s, S);
1011         SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
1012         SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
1013         SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
1014         SEQ_PUT_HEX_FIELD_RET(s, T);
1015
1016         return TRACE_TYPE_HANDLED;
1017 }
1018
1019 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1020                                        struct trace_event *event)
1021 {
1022         return trace_ctxwake_hex(iter, 0);
1023 }
1024
1025 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1026                                         struct trace_event *event)
1027 {
1028         return trace_ctxwake_hex(iter, '+');
1029 }
1030
1031 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1032                                            int flags, struct trace_event *event)
1033 {
1034         struct ctx_switch_entry *field;
1035         struct trace_seq *s = &iter->seq;
1036
1037         trace_assign_type(field, iter->ent);
1038
1039         SEQ_PUT_FIELD_RET(s, field->prev_pid);
1040         SEQ_PUT_FIELD_RET(s, field->prev_prio);
1041         SEQ_PUT_FIELD_RET(s, field->prev_state);
1042         SEQ_PUT_FIELD_RET(s, field->next_pid);
1043         SEQ_PUT_FIELD_RET(s, field->next_prio);
1044         SEQ_PUT_FIELD_RET(s, field->next_state);
1045
1046         return TRACE_TYPE_HANDLED;
1047 }
1048
1049 static struct trace_event_functions trace_ctx_funcs = {
1050         .trace          = trace_ctx_print,
1051         .raw            = trace_ctx_raw,
1052         .hex            = trace_ctx_hex,
1053         .binary         = trace_ctxwake_bin,
1054 };
1055
1056 static struct trace_event trace_ctx_event = {
1057         .type           = TRACE_CTX,
1058         .funcs          = &trace_ctx_funcs,
1059 };
1060
1061 static struct trace_event_functions trace_wake_funcs = {
1062         .trace          = trace_wake_print,
1063         .raw            = trace_wake_raw,
1064         .hex            = trace_wake_hex,
1065         .binary         = trace_ctxwake_bin,
1066 };
1067
1068 static struct trace_event trace_wake_event = {
1069         .type           = TRACE_WAKE,
1070         .funcs          = &trace_wake_funcs,
1071 };
1072
1073 /* TRACE_STACK */
1074
1075 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1076                                            int flags, struct trace_event *event)
1077 {
1078         struct stack_entry *field;
1079         struct trace_seq *s = &iter->seq;
1080         int i;
1081
1082         trace_assign_type(field, iter->ent);
1083
1084         if (!trace_seq_puts(s, "<stack trace>\n"))
1085                 goto partial;
1086         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1087                 if (!field->caller[i] || (field->caller[i] == ULONG_MAX))
1088                         break;
1089                 if (!trace_seq_puts(s, " => "))
1090                         goto partial;
1091
1092                 if (!seq_print_ip_sym(s, field->caller[i], flags))
1093                         goto partial;
1094                 if (!trace_seq_puts(s, "\n"))
1095                         goto partial;
1096         }
1097
1098         return TRACE_TYPE_HANDLED;
1099
1100  partial:
1101         return TRACE_TYPE_PARTIAL_LINE;
1102 }
1103
1104 static struct trace_event_functions trace_stack_funcs = {
1105         .trace          = trace_stack_print,
1106 };
1107
1108 static struct trace_event trace_stack_event = {
1109         .type           = TRACE_STACK,
1110         .funcs          = &trace_stack_funcs,
1111 };
1112
1113 /* TRACE_USER_STACK */
1114 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1115                                                 int flags, struct trace_event *event)
1116 {
1117         struct userstack_entry *field;
1118         struct trace_seq *s = &iter->seq;
1119
1120         trace_assign_type(field, iter->ent);
1121
1122         if (!trace_seq_puts(s, "<user stack trace>\n"))
1123                 goto partial;
1124
1125         if (!seq_print_userip_objs(field, s, flags))
1126                 goto partial;
1127
1128         return TRACE_TYPE_HANDLED;
1129
1130  partial:
1131         return TRACE_TYPE_PARTIAL_LINE;
1132 }
1133
1134 static struct trace_event_functions trace_user_stack_funcs = {
1135         .trace          = trace_user_stack_print,
1136 };
1137
1138 static struct trace_event trace_user_stack_event = {
1139         .type           = TRACE_USER_STACK,
1140         .funcs          = &trace_user_stack_funcs,
1141 };
1142
1143 /* TRACE_BPRINT */
1144 static enum print_line_t
1145 trace_bprint_print(struct trace_iterator *iter, int flags,
1146                    struct trace_event *event)
1147 {
1148         struct trace_entry *entry = iter->ent;
1149         struct trace_seq *s = &iter->seq;
1150         struct bprint_entry *field;
1151
1152         trace_assign_type(field, entry);
1153
1154         if (!seq_print_ip_sym(s, field->ip, flags))
1155                 goto partial;
1156
1157         if (!trace_seq_puts(s, ": "))
1158                 goto partial;
1159
1160         if (!trace_seq_bprintf(s, field->fmt, field->buf))
1161                 goto partial;
1162
1163         return TRACE_TYPE_HANDLED;
1164
1165  partial:
1166         return TRACE_TYPE_PARTIAL_LINE;
1167 }
1168
1169
1170 static enum print_line_t
1171 trace_bprint_raw(struct trace_iterator *iter, int flags,
1172                  struct trace_event *event)
1173 {
1174         struct bprint_entry *field;
1175         struct trace_seq *s = &iter->seq;
1176
1177         trace_assign_type(field, iter->ent);
1178
1179         if (!trace_seq_printf(s, ": %lx : ", field->ip))
1180                 goto partial;
1181
1182         if (!trace_seq_bprintf(s, field->fmt, field->buf))
1183                 goto partial;
1184
1185         return TRACE_TYPE_HANDLED;
1186
1187  partial:
1188         return TRACE_TYPE_PARTIAL_LINE;
1189 }
1190
1191 static struct trace_event_functions trace_bprint_funcs = {
1192         .trace          = trace_bprint_print,
1193         .raw            = trace_bprint_raw,
1194 };
1195
1196 static struct trace_event trace_bprint_event = {
1197         .type           = TRACE_BPRINT,
1198         .funcs          = &trace_bprint_funcs,
1199 };
1200
1201 /* TRACE_PRINT */
1202 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1203                                            int flags, struct trace_event *event)
1204 {
1205         struct print_entry *field;
1206         struct trace_seq *s = &iter->seq;
1207
1208         trace_assign_type(field, iter->ent);
1209
1210         if (!seq_print_ip_sym(s, field->ip, flags))
1211                 goto partial;
1212
1213         if (!trace_seq_printf(s, ": %s", field->buf))
1214                 goto partial;
1215
1216         return TRACE_TYPE_HANDLED;
1217
1218  partial:
1219         return TRACE_TYPE_PARTIAL_LINE;
1220 }
1221
1222 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1223                                          struct trace_event *event)
1224 {
1225         struct print_entry *field;
1226
1227         trace_assign_type(field, iter->ent);
1228
1229         if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1230                 goto partial;
1231
1232         return TRACE_TYPE_HANDLED;
1233
1234  partial:
1235         return TRACE_TYPE_PARTIAL_LINE;
1236 }
1237
1238 static struct trace_event_functions trace_print_funcs = {
1239         .trace          = trace_print_print,
1240         .raw            = trace_print_raw,
1241 };
1242
1243 static struct trace_event trace_print_event = {
1244         .type           = TRACE_PRINT,
1245         .funcs          = &trace_print_funcs,
1246 };
1247
1248
1249 static struct trace_event *events[] __initdata = {
1250         &trace_fn_event,
1251         &trace_ctx_event,
1252         &trace_wake_event,
1253         &trace_stack_event,
1254         &trace_user_stack_event,
1255         &trace_bprint_event,
1256         &trace_print_event,
1257         NULL
1258 };
1259
1260 __init static int init_events(void)
1261 {
1262         struct trace_event *event;
1263         int i, ret;
1264
1265         for (i = 0; events[i]; i++) {
1266                 event = events[i];
1267
1268                 ret = register_ftrace_event(event);
1269                 if (!ret) {
1270                         printk(KERN_WARNING "event %d failed to register\n",
1271                                event->type);
1272                         WARN_ON_ONCE(1);
1273                 }
1274         }
1275
1276         return 0;
1277 }
1278 device_initcall(init_events);