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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
17DECLARE_RWSEM(trace_event_mutex);
18
19static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
20
21static int next_event_type = __TRACE_LAST_TYPE + 1;
22
23int 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
40enum 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
56enum 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 */
86int
87trace_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}
110EXPORT_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 */
123int
124trace_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}
144EXPORT_SYMBOL_GPL(trace_seq_vprintf);
145
146int 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 */
177int 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
195int 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}
209EXPORT_SYMBOL(trace_seq_putc);
210
211int 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
227int 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
249void *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
267int 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
295const char *
296ftrace_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}
329EXPORT_SYMBOL(ftrace_print_flags_seq);
330
331const char *
332ftrace_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}
354EXPORT_SYMBOL(ftrace_print_symbols_seq);
355
356#if BITS_PER_LONG == 32
357const char *
358ftrace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
359 const struct trace_print_flags_u64 *symbol_array)
360{
361 int i;
362 const char *ret = p->buffer + p->len;
363
364 for (i = 0; symbol_array[i].name; i++) {
365
366 if (val != symbol_array[i].mask)
367 continue;
368
369 trace_seq_puts(p, symbol_array[i].name);
370 break;
371 }
372
373 if (!p->len)
374 trace_seq_printf(p, "0x%llx", val);
375
376 trace_seq_putc(p, 0);
377
378 return ret;
379}
380EXPORT_SYMBOL(ftrace_print_symbols_seq_u64);
381#endif
382
383const char *
384ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
385{
386 int i;
387 const char *ret = p->buffer + p->len;
388
389 for (i = 0; i < buf_len; i++)
390 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
391
392 trace_seq_putc(p, 0);
393
394 return ret;
395}
396EXPORT_SYMBOL(ftrace_print_hex_seq);
397
398#ifdef CONFIG_KRETPROBES
399static inline const char *kretprobed(const char *name)
400{
401 static const char tramp_name[] = "kretprobe_trampoline";
402 int size = sizeof(tramp_name);
403
404 if (strncmp(tramp_name, name, size) == 0)
405 return "[unknown/kretprobe'd]";
406 return name;
407}
408#else
409static inline const char *kretprobed(const char *name)
410{
411 return name;
412}
413#endif /* CONFIG_KRETPROBES */
414
415static int
416seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
417{
418#ifdef CONFIG_KALLSYMS
419 char str[KSYM_SYMBOL_LEN];
420 const char *name;
421
422 kallsyms_lookup(address, NULL, NULL, NULL, str);
423
424 name = kretprobed(str);
425
426 return trace_seq_printf(s, fmt, name);
427#endif
428 return 1;
429}
430
431static int
432seq_print_sym_offset(struct trace_seq *s, const char *fmt,
433 unsigned long address)
434{
435#ifdef CONFIG_KALLSYMS
436 char str[KSYM_SYMBOL_LEN];
437 const char *name;
438
439 sprint_symbol(str, address);
440 name = kretprobed(str);
441
442 return trace_seq_printf(s, fmt, name);
443#endif
444 return 1;
445}
446
447#ifndef CONFIG_64BIT
448# define IP_FMT "%08lx"
449#else
450# define IP_FMT "%016lx"
451#endif
452
453int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
454 unsigned long ip, unsigned long sym_flags)
455{
456 struct file *file = NULL;
457 unsigned long vmstart = 0;
458 int ret = 1;
459
460 if (s->full)
461 return 0;
462
463 if (mm) {
464 const struct vm_area_struct *vma;
465
466 down_read(&mm->mmap_sem);
467 vma = find_vma(mm, ip);
468 if (vma) {
469 file = vma->vm_file;
470 vmstart = vma->vm_start;
471 }
472 if (file) {
473 ret = trace_seq_path(s, &file->f_path);
474 if (ret)
475 ret = trace_seq_printf(s, "[+0x%lx]",
476 ip - vmstart);
477 }
478 up_read(&mm->mmap_sem);
479 }
480 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
481 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
482 return ret;
483}
484
485int
486seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
487 unsigned long sym_flags)
488{
489 struct mm_struct *mm = NULL;
490 int ret = 1;
491 unsigned int i;
492
493 if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
494 struct task_struct *task;
495 /*
496 * we do the lookup on the thread group leader,
497 * since individual threads might have already quit!
498 */
499 rcu_read_lock();
500 task = find_task_by_vpid(entry->tgid);
501 if (task)
502 mm = get_task_mm(task);
503 rcu_read_unlock();
504 }
505
506 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
507 unsigned long ip = entry->caller[i];
508
509 if (ip == ULONG_MAX || !ret)
510 break;
511 if (ret)
512 ret = trace_seq_puts(s, " => ");
513 if (!ip) {
514 if (ret)
515 ret = trace_seq_puts(s, "??");
516 if (ret)
517 ret = trace_seq_puts(s, "\n");
518 continue;
519 }
520 if (!ret)
521 break;
522 if (ret)
523 ret = seq_print_user_ip(s, mm, ip, sym_flags);
524 ret = trace_seq_puts(s, "\n");
525 }
526
527 if (mm)
528 mmput(mm);
529 return ret;
530}
531
532int
533seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
534{
535 int ret;
536
537 if (!ip)
538 return trace_seq_printf(s, "0");
539
540 if (sym_flags & TRACE_ITER_SYM_OFFSET)
541 ret = seq_print_sym_offset(s, "%s", ip);
542 else
543 ret = seq_print_sym_short(s, "%s", ip);
544
545 if (!ret)
546 return 0;
547
548 if (sym_flags & TRACE_ITER_SYM_ADDR)
549 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
550 return ret;
551}
552
553/**
554 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
555 * @s: trace seq struct to write to
556 * @entry: The trace entry field from the ring buffer
557 *
558 * Prints the generic fields of irqs off, in hard or softirq, preempt
559 * count.
560 */
561int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
562{
563 char hardsoft_irq;
564 char need_resched;
565 char irqs_off;
566 int hardirq;
567 int softirq;
568 int ret;
569
570 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
571 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
572
573 irqs_off =
574 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
575 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
576 '.';
577 need_resched =
578 (entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.';
579 hardsoft_irq =
580 (hardirq && softirq) ? 'H' :
581 hardirq ? 'h' :
582 softirq ? 's' :
583 '.';
584
585 if (!trace_seq_printf(s, "%c%c%c",
586 irqs_off, need_resched, hardsoft_irq))
587 return 0;
588
589 if (entry->preempt_count)
590 ret = trace_seq_printf(s, "%x", entry->preempt_count);
591 else
592 ret = trace_seq_putc(s, '.');
593
594 return ret;
595}
596
597static int
598lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
599{
600 char comm[TASK_COMM_LEN];
601
602 trace_find_cmdline(entry->pid, comm);
603
604 if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
605 comm, entry->pid, cpu))
606 return 0;
607
608 return trace_print_lat_fmt(s, entry);
609}
610
611static unsigned long preempt_mark_thresh = 100;
612
613static int
614lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
615 unsigned long rel_usecs)
616{
617 return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
618 rel_usecs > preempt_mark_thresh ? '!' :
619 rel_usecs > 1 ? '+' : ' ');
620}
621
622int trace_print_context(struct trace_iterator *iter)
623{
624 struct trace_seq *s = &iter->seq;
625 struct trace_entry *entry = iter->ent;
626 unsigned long long t = ns2usecs(iter->ts);
627 unsigned long usec_rem = do_div(t, USEC_PER_SEC);
628 unsigned long secs = (unsigned long)t;
629 char comm[TASK_COMM_LEN];
630
631 trace_find_cmdline(entry->pid, comm);
632
633 return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
634 comm, entry->pid, iter->cpu, secs, usec_rem);
635}
636
637int trace_print_lat_context(struct trace_iterator *iter)
638{
639 u64 next_ts;
640 int ret;
641 struct trace_seq *s = &iter->seq;
642 struct trace_entry *entry = iter->ent,
643 *next_entry = trace_find_next_entry(iter, NULL,
644 &next_ts);
645 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
646 unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
647 unsigned long rel_usecs;
648
649 if (!next_entry)
650 next_ts = iter->ts;
651 rel_usecs = ns2usecs(next_ts - iter->ts);
652
653 if (verbose) {
654 char comm[TASK_COMM_LEN];
655
656 trace_find_cmdline(entry->pid, comm);
657
658 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
659 " %ld.%03ldms (+%ld.%03ldms): ", comm,
660 entry->pid, iter->cpu, entry->flags,
661 entry->preempt_count, iter->idx,
662 ns2usecs(iter->ts),
663 abs_usecs / USEC_PER_MSEC,
664 abs_usecs % USEC_PER_MSEC,
665 rel_usecs / USEC_PER_MSEC,
666 rel_usecs % USEC_PER_MSEC);
667 } else {
668 ret = lat_print_generic(s, entry, iter->cpu);
669 if (ret)
670 ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
671 }
672
673 return ret;
674}
675
676static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
677
678static int task_state_char(unsigned long state)
679{
680 int bit = state ? __ffs(state) + 1 : 0;
681
682 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
683}
684
685/**
686 * ftrace_find_event - find a registered event
687 * @type: the type of event to look for
688 *
689 * Returns an event of type @type otherwise NULL
690 * Called with trace_event_read_lock() held.
691 */
692struct trace_event *ftrace_find_event(int type)
693{
694 struct trace_event *event;
695 struct hlist_node *n;
696 unsigned key;
697
698 key = type & (EVENT_HASHSIZE - 1);
699
700 hlist_for_each_entry(event, n, &event_hash[key], node) {
701 if (event->type == type)
702 return event;
703 }
704
705 return NULL;
706}
707
708static LIST_HEAD(ftrace_event_list);
709
710static int trace_search_list(struct list_head **list)
711{
712 struct trace_event *e;
713 int last = __TRACE_LAST_TYPE;
714
715 if (list_empty(&ftrace_event_list)) {
716 *list = &ftrace_event_list;
717 return last + 1;
718 }
719
720 /*
721 * We used up all possible max events,
722 * lets see if somebody freed one.
723 */
724 list_for_each_entry(e, &ftrace_event_list, list) {
725 if (e->type != last + 1)
726 break;
727 last++;
728 }
729
730 /* Did we used up all 65 thousand events??? */
731 if ((last + 1) > FTRACE_MAX_EVENT)
732 return 0;
733
734 *list = &e->list;
735 return last + 1;
736}
737
738void trace_event_read_lock(void)
739{
740 down_read(&trace_event_mutex);
741}
742
743void trace_event_read_unlock(void)
744{
745 up_read(&trace_event_mutex);
746}
747
748/**
749 * register_ftrace_event - register output for an event type
750 * @event: the event type to register
751 *
752 * Event types are stored in a hash and this hash is used to
753 * find a way to print an event. If the @event->type is set
754 * then it will use that type, otherwise it will assign a
755 * type to use.
756 *
757 * If you assign your own type, please make sure it is added
758 * to the trace_type enum in trace.h, to avoid collisions
759 * with the dynamic types.
760 *
761 * Returns the event type number or zero on error.
762 */
763int register_ftrace_event(struct trace_event *event)
764{
765 unsigned key;
766 int ret = 0;
767
768 down_write(&trace_event_mutex);
769
770 if (WARN_ON(!event))
771 goto out;
772
773 if (WARN_ON(!event->funcs))
774 goto out;
775
776 INIT_LIST_HEAD(&event->list);
777
778 if (!event->type) {
779 struct list_head *list = NULL;
780
781 if (next_event_type > FTRACE_MAX_EVENT) {
782
783 event->type = trace_search_list(&list);
784 if (!event->type)
785 goto out;
786
787 } else {
788
789 event->type = next_event_type++;
790 list = &ftrace_event_list;
791 }
792
793 if (WARN_ON(ftrace_find_event(event->type)))
794 goto out;
795
796 list_add_tail(&event->list, list);
797
798 } else if (event->type > __TRACE_LAST_TYPE) {
799 printk(KERN_WARNING "Need to add type to trace.h\n");
800 WARN_ON(1);
801 goto out;
802 } else {
803 /* Is this event already used */
804 if (ftrace_find_event(event->type))
805 goto out;
806 }
807
808 if (event->funcs->trace == NULL)
809 event->funcs->trace = trace_nop_print;
810 if (event->funcs->raw == NULL)
811 event->funcs->raw = trace_nop_print;
812 if (event->funcs->hex == NULL)
813 event->funcs->hex = trace_nop_print;
814 if (event->funcs->binary == NULL)
815 event->funcs->binary = trace_nop_print;
816
817 key = event->type & (EVENT_HASHSIZE - 1);
818
819 hlist_add_head(&event->node, &event_hash[key]);
820
821 ret = event->type;
822 out:
823 up_write(&trace_event_mutex);
824
825 return ret;
826}
827EXPORT_SYMBOL_GPL(register_ftrace_event);
828
829/*
830 * Used by module code with the trace_event_mutex held for write.
831 */
832int __unregister_ftrace_event(struct trace_event *event)
833{
834 hlist_del(&event->node);
835 list_del(&event->list);
836 return 0;
837}
838
839/**
840 * unregister_ftrace_event - remove a no longer used event
841 * @event: the event to remove
842 */
843int unregister_ftrace_event(struct trace_event *event)
844{
845 down_write(&trace_event_mutex);
846 __unregister_ftrace_event(event);
847 up_write(&trace_event_mutex);
848
849 return 0;
850}
851EXPORT_SYMBOL_GPL(unregister_ftrace_event);
852
853/*
854 * Standard events
855 */
856
857enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
858 struct trace_event *event)
859{
860 if (!trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type))
861 return TRACE_TYPE_PARTIAL_LINE;
862
863 return TRACE_TYPE_HANDLED;
864}
865
866/* TRACE_FN */
867static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
868 struct trace_event *event)
869{
870 struct ftrace_entry *field;
871 struct trace_seq *s = &iter->seq;
872
873 trace_assign_type(field, iter->ent);
874
875 if (!seq_print_ip_sym(s, field->ip, flags))
876 goto partial;
877
878 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
879 if (!trace_seq_printf(s, " <-"))
880 goto partial;
881 if (!seq_print_ip_sym(s,
882 field->parent_ip,
883 flags))
884 goto partial;
885 }
886 if (!trace_seq_printf(s, "\n"))
887 goto partial;
888
889 return TRACE_TYPE_HANDLED;
890
891 partial:
892 return TRACE_TYPE_PARTIAL_LINE;
893}
894
895static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
896 struct trace_event *event)
897{
898 struct ftrace_entry *field;
899
900 trace_assign_type(field, iter->ent);
901
902 if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
903 field->ip,
904 field->parent_ip))
905 return TRACE_TYPE_PARTIAL_LINE;
906
907 return TRACE_TYPE_HANDLED;
908}
909
910static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
911 struct trace_event *event)
912{
913 struct ftrace_entry *field;
914 struct trace_seq *s = &iter->seq;
915
916 trace_assign_type(field, iter->ent);
917
918 SEQ_PUT_HEX_FIELD_RET(s, field->ip);
919 SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
920
921 return TRACE_TYPE_HANDLED;
922}
923
924static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
925 struct trace_event *event)
926{
927 struct ftrace_entry *field;
928 struct trace_seq *s = &iter->seq;
929
930 trace_assign_type(field, iter->ent);
931
932 SEQ_PUT_FIELD_RET(s, field->ip);
933 SEQ_PUT_FIELD_RET(s, field->parent_ip);
934
935 return TRACE_TYPE_HANDLED;
936}
937
938static struct trace_event_functions trace_fn_funcs = {
939 .trace = trace_fn_trace,
940 .raw = trace_fn_raw,
941 .hex = trace_fn_hex,
942 .binary = trace_fn_bin,
943};
944
945static struct trace_event trace_fn_event = {
946 .type = TRACE_FN,
947 .funcs = &trace_fn_funcs,
948};
949
950/* TRACE_CTX an TRACE_WAKE */
951static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
952 char *delim)
953{
954 struct ctx_switch_entry *field;
955 char comm[TASK_COMM_LEN];
956 int S, T;
957
958
959 trace_assign_type(field, iter->ent);
960
961 T = task_state_char(field->next_state);
962 S = task_state_char(field->prev_state);
963 trace_find_cmdline(field->next_pid, comm);
964 if (!trace_seq_printf(&iter->seq,
965 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
966 field->prev_pid,
967 field->prev_prio,
968 S, delim,
969 field->next_cpu,
970 field->next_pid,
971 field->next_prio,
972 T, comm))
973 return TRACE_TYPE_PARTIAL_LINE;
974
975 return TRACE_TYPE_HANDLED;
976}
977
978static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
979 struct trace_event *event)
980{
981 return trace_ctxwake_print(iter, "==>");
982}
983
984static enum print_line_t trace_wake_print(struct trace_iterator *iter,
985 int flags, struct trace_event *event)
986{
987 return trace_ctxwake_print(iter, " +");
988}
989
990static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
991{
992 struct ctx_switch_entry *field;
993 int T;
994
995 trace_assign_type(field, iter->ent);
996
997 if (!S)
998 S = task_state_char(field->prev_state);
999 T = task_state_char(field->next_state);
1000 if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
1001 field->prev_pid,
1002 field->prev_prio,
1003 S,
1004 field->next_cpu,
1005 field->next_pid,
1006 field->next_prio,
1007 T))
1008 return TRACE_TYPE_PARTIAL_LINE;
1009
1010 return TRACE_TYPE_HANDLED;
1011}
1012
1013static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
1014 struct trace_event *event)
1015{
1016 return trace_ctxwake_raw(iter, 0);
1017}
1018
1019static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
1020 struct trace_event *event)
1021{
1022 return trace_ctxwake_raw(iter, '+');
1023}
1024
1025
1026static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
1027{
1028 struct ctx_switch_entry *field;
1029 struct trace_seq *s = &iter->seq;
1030 int T;
1031
1032 trace_assign_type(field, iter->ent);
1033
1034 if (!S)
1035 S = task_state_char(field->prev_state);
1036 T = task_state_char(field->next_state);
1037
1038 SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
1039 SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
1040 SEQ_PUT_HEX_FIELD_RET(s, S);
1041 SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
1042 SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
1043 SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
1044 SEQ_PUT_HEX_FIELD_RET(s, T);
1045
1046 return TRACE_TYPE_HANDLED;
1047}
1048
1049static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1050 struct trace_event *event)
1051{
1052 return trace_ctxwake_hex(iter, 0);
1053}
1054
1055static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1056 struct trace_event *event)
1057{
1058 return trace_ctxwake_hex(iter, '+');
1059}
1060
1061static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1062 int flags, struct trace_event *event)
1063{
1064 struct ctx_switch_entry *field;
1065 struct trace_seq *s = &iter->seq;
1066
1067 trace_assign_type(field, iter->ent);
1068
1069 SEQ_PUT_FIELD_RET(s, field->prev_pid);
1070 SEQ_PUT_FIELD_RET(s, field->prev_prio);
1071 SEQ_PUT_FIELD_RET(s, field->prev_state);
1072 SEQ_PUT_FIELD_RET(s, field->next_pid);
1073 SEQ_PUT_FIELD_RET(s, field->next_prio);
1074 SEQ_PUT_FIELD_RET(s, field->next_state);
1075
1076 return TRACE_TYPE_HANDLED;
1077}
1078
1079static struct trace_event_functions trace_ctx_funcs = {
1080 .trace = trace_ctx_print,
1081 .raw = trace_ctx_raw,
1082 .hex = trace_ctx_hex,
1083 .binary = trace_ctxwake_bin,
1084};
1085
1086static struct trace_event trace_ctx_event = {
1087 .type = TRACE_CTX,
1088 .funcs = &trace_ctx_funcs,
1089};
1090
1091static struct trace_event_functions trace_wake_funcs = {
1092 .trace = trace_wake_print,
1093 .raw = trace_wake_raw,
1094 .hex = trace_wake_hex,
1095 .binary = trace_ctxwake_bin,
1096};
1097
1098static struct trace_event trace_wake_event = {
1099 .type = TRACE_WAKE,
1100 .funcs = &trace_wake_funcs,
1101};
1102
1103/* TRACE_STACK */
1104
1105static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1106 int flags, struct trace_event *event)
1107{
1108 struct stack_entry *field;
1109 struct trace_seq *s = &iter->seq;
1110 unsigned long *p;
1111 unsigned long *end;
1112
1113 trace_assign_type(field, iter->ent);
1114 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1115
1116 if (!trace_seq_puts(s, "<stack trace>\n"))
1117 goto partial;
1118
1119 for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1120 if (!trace_seq_puts(s, " => "))
1121 goto partial;
1122
1123 if (!seq_print_ip_sym(s, *p, flags))
1124 goto partial;
1125 if (!trace_seq_puts(s, "\n"))
1126 goto partial;
1127 }
1128
1129 return TRACE_TYPE_HANDLED;
1130
1131 partial:
1132 return TRACE_TYPE_PARTIAL_LINE;
1133}
1134
1135static struct trace_event_functions trace_stack_funcs = {
1136 .trace = trace_stack_print,
1137};
1138
1139static struct trace_event trace_stack_event = {
1140 .type = TRACE_STACK,
1141 .funcs = &trace_stack_funcs,
1142};
1143
1144/* TRACE_USER_STACK */
1145static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1146 int flags, struct trace_event *event)
1147{
1148 struct userstack_entry *field;
1149 struct trace_seq *s = &iter->seq;
1150
1151 trace_assign_type(field, iter->ent);
1152
1153 if (!trace_seq_puts(s, "<user stack trace>\n"))
1154 goto partial;
1155
1156 if (!seq_print_userip_objs(field, s, flags))
1157 goto partial;
1158
1159 return TRACE_TYPE_HANDLED;
1160
1161 partial:
1162 return TRACE_TYPE_PARTIAL_LINE;
1163}
1164
1165static struct trace_event_functions trace_user_stack_funcs = {
1166 .trace = trace_user_stack_print,
1167};
1168
1169static struct trace_event trace_user_stack_event = {
1170 .type = TRACE_USER_STACK,
1171 .funcs = &trace_user_stack_funcs,
1172};
1173
1174/* TRACE_BPRINT */
1175static enum print_line_t
1176trace_bprint_print(struct trace_iterator *iter, int flags,
1177 struct trace_event *event)
1178{
1179 struct trace_entry *entry = iter->ent;
1180 struct trace_seq *s = &iter->seq;
1181 struct bprint_entry *field;
1182
1183 trace_assign_type(field, entry);
1184
1185 if (!seq_print_ip_sym(s, field->ip, flags))
1186 goto partial;
1187
1188 if (!trace_seq_puts(s, ": "))
1189 goto partial;
1190
1191 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1192 goto partial;
1193
1194 return TRACE_TYPE_HANDLED;
1195
1196 partial:
1197 return TRACE_TYPE_PARTIAL_LINE;
1198}
1199
1200
1201static enum print_line_t
1202trace_bprint_raw(struct trace_iterator *iter, int flags,
1203 struct trace_event *event)
1204{
1205 struct bprint_entry *field;
1206 struct trace_seq *s = &iter->seq;
1207
1208 trace_assign_type(field, iter->ent);
1209
1210 if (!trace_seq_printf(s, ": %lx : ", field->ip))
1211 goto partial;
1212
1213 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1214 goto partial;
1215
1216 return TRACE_TYPE_HANDLED;
1217
1218 partial:
1219 return TRACE_TYPE_PARTIAL_LINE;
1220}
1221
1222static struct trace_event_functions trace_bprint_funcs = {
1223 .trace = trace_bprint_print,
1224 .raw = trace_bprint_raw,
1225};
1226
1227static struct trace_event trace_bprint_event = {
1228 .type = TRACE_BPRINT,
1229 .funcs = &trace_bprint_funcs,
1230};
1231
1232/* TRACE_PRINT */
1233static enum print_line_t trace_print_print(struct trace_iterator *iter,
1234 int flags, struct trace_event *event)
1235{
1236 struct print_entry *field;
1237 struct trace_seq *s = &iter->seq;
1238
1239 trace_assign_type(field, iter->ent);
1240
1241 if (!seq_print_ip_sym(s, field->ip, flags))
1242 goto partial;
1243
1244 if (!trace_seq_printf(s, ": %s", field->buf))
1245 goto partial;
1246
1247 return TRACE_TYPE_HANDLED;
1248
1249 partial:
1250 return TRACE_TYPE_PARTIAL_LINE;
1251}
1252
1253static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1254 struct trace_event *event)
1255{
1256 struct print_entry *field;
1257
1258 trace_assign_type(field, iter->ent);
1259
1260 if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1261 goto partial;
1262
1263 return TRACE_TYPE_HANDLED;
1264
1265 partial:
1266 return TRACE_TYPE_PARTIAL_LINE;
1267}
1268
1269static struct trace_event_functions trace_print_funcs = {
1270 .trace = trace_print_print,
1271 .raw = trace_print_raw,
1272};
1273
1274static struct trace_event trace_print_event = {
1275 .type = TRACE_PRINT,
1276 .funcs = &trace_print_funcs,
1277};
1278
1279
1280static struct trace_event *events[] __initdata = {
1281 &trace_fn_event,
1282 &trace_ctx_event,
1283 &trace_wake_event,
1284 &trace_stack_event,
1285 &trace_user_stack_event,
1286 &trace_bprint_event,
1287 &trace_print_event,
1288 NULL
1289};
1290
1291__init static int init_events(void)
1292{
1293 struct trace_event *event;
1294 int i, ret;
1295
1296 for (i = 0; events[i]; i++) {
1297 event = events[i];
1298
1299 ret = register_ftrace_event(event);
1300 if (!ret) {
1301 printk(KERN_WARNING "event %d failed to register\n",
1302 event->type);
1303 WARN_ON_ONCE(1);
1304 }
1305 }
1306
1307 return 0;
1308}
1309device_initcall(init_events);
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * trace_output.c
4 *
5 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
6 *
7 */
8#include <linux/module.h>
9#include <linux/mutex.h>
10#include <linux/ftrace.h>
11#include <linux/sched/clock.h>
12#include <linux/sched/mm.h>
13
14#include "trace_output.h"
15
16/* must be a power of 2 */
17#define EVENT_HASHSIZE 128
18
19DECLARE_RWSEM(trace_event_sem);
20
21static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
22
23static int next_event_type = __TRACE_LAST_TYPE;
24
25enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
26{
27 struct trace_seq *s = &iter->seq;
28 struct trace_entry *entry = iter->ent;
29 struct bputs_entry *field;
30
31 trace_assign_type(field, entry);
32
33 trace_seq_puts(s, field->str);
34
35 return trace_handle_return(s);
36}
37
38enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
39{
40 struct trace_seq *s = &iter->seq;
41 struct trace_entry *entry = iter->ent;
42 struct bprint_entry *field;
43
44 trace_assign_type(field, entry);
45
46 trace_seq_bprintf(s, field->fmt, field->buf);
47
48 return trace_handle_return(s);
49}
50
51enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
52{
53 struct trace_seq *s = &iter->seq;
54 struct trace_entry *entry = iter->ent;
55 struct print_entry *field;
56
57 trace_assign_type(field, entry);
58
59 trace_seq_puts(s, field->buf);
60
61 return trace_handle_return(s);
62}
63
64const char *
65trace_print_flags_seq(struct trace_seq *p, const char *delim,
66 unsigned long flags,
67 const struct trace_print_flags *flag_array)
68{
69 unsigned long mask;
70 const char *str;
71 const char *ret = trace_seq_buffer_ptr(p);
72 int i, first = 1;
73
74 for (i = 0; flag_array[i].name && flags; i++) {
75
76 mask = flag_array[i].mask;
77 if ((flags & mask) != mask)
78 continue;
79
80 str = flag_array[i].name;
81 flags &= ~mask;
82 if (!first && delim)
83 trace_seq_puts(p, delim);
84 else
85 first = 0;
86 trace_seq_puts(p, str);
87 }
88
89 /* check for left over flags */
90 if (flags) {
91 if (!first && delim)
92 trace_seq_puts(p, delim);
93 trace_seq_printf(p, "0x%lx", flags);
94 }
95
96 trace_seq_putc(p, 0);
97
98 return ret;
99}
100EXPORT_SYMBOL(trace_print_flags_seq);
101
102const char *
103trace_print_symbols_seq(struct trace_seq *p, unsigned long val,
104 const struct trace_print_flags *symbol_array)
105{
106 int i;
107 const char *ret = trace_seq_buffer_ptr(p);
108
109 for (i = 0; symbol_array[i].name; i++) {
110
111 if (val != symbol_array[i].mask)
112 continue;
113
114 trace_seq_puts(p, symbol_array[i].name);
115 break;
116 }
117
118 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
119 trace_seq_printf(p, "0x%lx", val);
120
121 trace_seq_putc(p, 0);
122
123 return ret;
124}
125EXPORT_SYMBOL(trace_print_symbols_seq);
126
127#if BITS_PER_LONG == 32
128const char *
129trace_print_flags_seq_u64(struct trace_seq *p, const char *delim,
130 unsigned long long flags,
131 const struct trace_print_flags_u64 *flag_array)
132{
133 unsigned long long mask;
134 const char *str;
135 const char *ret = trace_seq_buffer_ptr(p);
136 int i, first = 1;
137
138 for (i = 0; flag_array[i].name && flags; i++) {
139
140 mask = flag_array[i].mask;
141 if ((flags & mask) != mask)
142 continue;
143
144 str = flag_array[i].name;
145 flags &= ~mask;
146 if (!first && delim)
147 trace_seq_puts(p, delim);
148 else
149 first = 0;
150 trace_seq_puts(p, str);
151 }
152
153 /* check for left over flags */
154 if (flags) {
155 if (!first && delim)
156 trace_seq_puts(p, delim);
157 trace_seq_printf(p, "0x%llx", flags);
158 }
159
160 trace_seq_putc(p, 0);
161
162 return ret;
163}
164EXPORT_SYMBOL(trace_print_flags_seq_u64);
165
166const char *
167trace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
168 const struct trace_print_flags_u64 *symbol_array)
169{
170 int i;
171 const char *ret = trace_seq_buffer_ptr(p);
172
173 for (i = 0; symbol_array[i].name; i++) {
174
175 if (val != symbol_array[i].mask)
176 continue;
177
178 trace_seq_puts(p, symbol_array[i].name);
179 break;
180 }
181
182 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
183 trace_seq_printf(p, "0x%llx", val);
184
185 trace_seq_putc(p, 0);
186
187 return ret;
188}
189EXPORT_SYMBOL(trace_print_symbols_seq_u64);
190#endif
191
192const char *
193trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
194 unsigned int bitmask_size)
195{
196 const char *ret = trace_seq_buffer_ptr(p);
197
198 trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8);
199 trace_seq_putc(p, 0);
200
201 return ret;
202}
203EXPORT_SYMBOL_GPL(trace_print_bitmask_seq);
204
205/**
206 * trace_print_hex_seq - print buffer as hex sequence
207 * @p: trace seq struct to write to
208 * @buf: The buffer to print
209 * @buf_len: Length of @buf in bytes
210 * @concatenate: Print @buf as single hex string or with spacing
211 *
212 * Prints the passed buffer as a hex sequence either as a whole,
213 * single hex string if @concatenate is true or with spacing after
214 * each byte in case @concatenate is false.
215 */
216const char *
217trace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len,
218 bool concatenate)
219{
220 int i;
221 const char *ret = trace_seq_buffer_ptr(p);
222 const char *fmt = concatenate ? "%*phN" : "%*ph";
223
224 for (i = 0; i < buf_len; i += 16)
225 trace_seq_printf(p, fmt, min(buf_len - i, 16), &buf[i]);
226 trace_seq_putc(p, 0);
227
228 return ret;
229}
230EXPORT_SYMBOL(trace_print_hex_seq);
231
232const char *
233trace_print_array_seq(struct trace_seq *p, const void *buf, int count,
234 size_t el_size)
235{
236 const char *ret = trace_seq_buffer_ptr(p);
237 const char *prefix = "";
238 void *ptr = (void *)buf;
239 size_t buf_len = count * el_size;
240
241 trace_seq_putc(p, '{');
242
243 while (ptr < buf + buf_len) {
244 switch (el_size) {
245 case 1:
246 trace_seq_printf(p, "%s0x%x", prefix,
247 *(u8 *)ptr);
248 break;
249 case 2:
250 trace_seq_printf(p, "%s0x%x", prefix,
251 *(u16 *)ptr);
252 break;
253 case 4:
254 trace_seq_printf(p, "%s0x%x", prefix,
255 *(u32 *)ptr);
256 break;
257 case 8:
258 trace_seq_printf(p, "%s0x%llx", prefix,
259 *(u64 *)ptr);
260 break;
261 default:
262 trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
263 *(u8 *)ptr);
264 el_size = 1;
265 }
266 prefix = ",";
267 ptr += el_size;
268 }
269
270 trace_seq_putc(p, '}');
271 trace_seq_putc(p, 0);
272
273 return ret;
274}
275EXPORT_SYMBOL(trace_print_array_seq);
276
277const char *
278trace_print_hex_dump_seq(struct trace_seq *p, const char *prefix_str,
279 int prefix_type, int rowsize, int groupsize,
280 const void *buf, size_t len, bool ascii)
281{
282 const char *ret = trace_seq_buffer_ptr(p);
283
284 trace_seq_putc(p, '\n');
285 trace_seq_hex_dump(p, prefix_str, prefix_type,
286 rowsize, groupsize, buf, len, ascii);
287 trace_seq_putc(p, 0);
288 return ret;
289}
290EXPORT_SYMBOL(trace_print_hex_dump_seq);
291
292int trace_raw_output_prep(struct trace_iterator *iter,
293 struct trace_event *trace_event)
294{
295 struct trace_event_call *event;
296 struct trace_seq *s = &iter->seq;
297 struct trace_seq *p = &iter->tmp_seq;
298 struct trace_entry *entry;
299
300 event = container_of(trace_event, struct trace_event_call, event);
301 entry = iter->ent;
302
303 if (entry->type != event->event.type) {
304 WARN_ON_ONCE(1);
305 return TRACE_TYPE_UNHANDLED;
306 }
307
308 trace_seq_init(p);
309 trace_seq_printf(s, "%s: ", trace_event_name(event));
310
311 return trace_handle_return(s);
312}
313EXPORT_SYMBOL(trace_raw_output_prep);
314
315void trace_event_printf(struct trace_iterator *iter, const char *fmt, ...)
316{
317 va_list ap;
318
319 va_start(ap, fmt);
320 trace_check_vprintf(iter, trace_event_format(iter, fmt), ap);
321 va_end(ap);
322}
323EXPORT_SYMBOL(trace_event_printf);
324
325static int trace_output_raw(struct trace_iterator *iter, char *name,
326 char *fmt, va_list ap)
327{
328 struct trace_seq *s = &iter->seq;
329
330 trace_seq_printf(s, "%s: ", name);
331 trace_seq_vprintf(s, trace_event_format(iter, fmt), ap);
332
333 return trace_handle_return(s);
334}
335
336int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
337{
338 va_list ap;
339 int ret;
340
341 va_start(ap, fmt);
342 ret = trace_output_raw(iter, name, fmt, ap);
343 va_end(ap);
344
345 return ret;
346}
347EXPORT_SYMBOL_GPL(trace_output_call);
348
349#ifdef CONFIG_KRETPROBES
350static inline const char *kretprobed(const char *name)
351{
352 static const char tramp_name[] = "kretprobe_trampoline";
353 int size = sizeof(tramp_name);
354
355 if (strncmp(tramp_name, name, size) == 0)
356 return "[unknown/kretprobe'd]";
357 return name;
358}
359#else
360static inline const char *kretprobed(const char *name)
361{
362 return name;
363}
364#endif /* CONFIG_KRETPROBES */
365
366void
367trace_seq_print_sym(struct trace_seq *s, unsigned long address, bool offset)
368{
369#ifdef CONFIG_KALLSYMS
370 char str[KSYM_SYMBOL_LEN];
371 const char *name;
372
373 if (offset)
374 sprint_symbol(str, address);
375 else
376 kallsyms_lookup(address, NULL, NULL, NULL, str);
377 name = kretprobed(str);
378
379 if (name && strlen(name)) {
380 trace_seq_puts(s, name);
381 return;
382 }
383#endif
384 trace_seq_printf(s, "0x%08lx", address);
385}
386
387#ifndef CONFIG_64BIT
388# define IP_FMT "%08lx"
389#else
390# define IP_FMT "%016lx"
391#endif
392
393static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
394 unsigned long ip, unsigned long sym_flags)
395{
396 struct file *file = NULL;
397 unsigned long vmstart = 0;
398 int ret = 1;
399
400 if (s->full)
401 return 0;
402
403 if (mm) {
404 const struct vm_area_struct *vma;
405
406 mmap_read_lock(mm);
407 vma = find_vma(mm, ip);
408 if (vma) {
409 file = vma->vm_file;
410 vmstart = vma->vm_start;
411 }
412 if (file) {
413 ret = trace_seq_path(s, &file->f_path);
414 if (ret)
415 trace_seq_printf(s, "[+0x%lx]",
416 ip - vmstart);
417 }
418 mmap_read_unlock(mm);
419 }
420 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
421 trace_seq_printf(s, " <" IP_FMT ">", ip);
422 return !trace_seq_has_overflowed(s);
423}
424
425int
426seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
427{
428 if (!ip) {
429 trace_seq_putc(s, '0');
430 goto out;
431 }
432
433 trace_seq_print_sym(s, ip, sym_flags & TRACE_ITER_SYM_OFFSET);
434
435 if (sym_flags & TRACE_ITER_SYM_ADDR)
436 trace_seq_printf(s, " <" IP_FMT ">", ip);
437
438 out:
439 return !trace_seq_has_overflowed(s);
440}
441
442/**
443 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
444 * @s: trace seq struct to write to
445 * @entry: The trace entry field from the ring buffer
446 *
447 * Prints the generic fields of irqs off, in hard or softirq, preempt
448 * count.
449 */
450int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
451{
452 char hardsoft_irq;
453 char need_resched;
454 char irqs_off;
455 int hardirq;
456 int softirq;
457 int nmi;
458
459 nmi = entry->flags & TRACE_FLAG_NMI;
460 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
461 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
462
463 irqs_off =
464 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
465 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
466 '.';
467
468 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
469 TRACE_FLAG_PREEMPT_RESCHED)) {
470 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
471 need_resched = 'N';
472 break;
473 case TRACE_FLAG_NEED_RESCHED:
474 need_resched = 'n';
475 break;
476 case TRACE_FLAG_PREEMPT_RESCHED:
477 need_resched = 'p';
478 break;
479 default:
480 need_resched = '.';
481 break;
482 }
483
484 hardsoft_irq =
485 (nmi && hardirq) ? 'Z' :
486 nmi ? 'z' :
487 (hardirq && softirq) ? 'H' :
488 hardirq ? 'h' :
489 softirq ? 's' :
490 '.' ;
491
492 trace_seq_printf(s, "%c%c%c",
493 irqs_off, need_resched, hardsoft_irq);
494
495 if (entry->preempt_count)
496 trace_seq_printf(s, "%x", entry->preempt_count);
497 else
498 trace_seq_putc(s, '.');
499
500 return !trace_seq_has_overflowed(s);
501}
502
503static int
504lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
505{
506 char comm[TASK_COMM_LEN];
507
508 trace_find_cmdline(entry->pid, comm);
509
510 trace_seq_printf(s, "%8.8s-%-7d %3d",
511 comm, entry->pid, cpu);
512
513 return trace_print_lat_fmt(s, entry);
514}
515
516#undef MARK
517#define MARK(v, s) {.val = v, .sym = s}
518/* trace overhead mark */
519static const struct trace_mark {
520 unsigned long long val; /* unit: nsec */
521 char sym;
522} mark[] = {
523 MARK(1000000000ULL , '$'), /* 1 sec */
524 MARK(100000000ULL , '@'), /* 100 msec */
525 MARK(10000000ULL , '*'), /* 10 msec */
526 MARK(1000000ULL , '#'), /* 1000 usecs */
527 MARK(100000ULL , '!'), /* 100 usecs */
528 MARK(10000ULL , '+'), /* 10 usecs */
529};
530#undef MARK
531
532char trace_find_mark(unsigned long long d)
533{
534 int i;
535 int size = ARRAY_SIZE(mark);
536
537 for (i = 0; i < size; i++) {
538 if (d > mark[i].val)
539 break;
540 }
541
542 return (i == size) ? ' ' : mark[i].sym;
543}
544
545static int
546lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
547{
548 struct trace_array *tr = iter->tr;
549 unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
550 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
551 unsigned long long abs_ts = iter->ts - iter->array_buffer->time_start;
552 unsigned long long rel_ts = next_ts - iter->ts;
553 struct trace_seq *s = &iter->seq;
554
555 if (in_ns) {
556 abs_ts = ns2usecs(abs_ts);
557 rel_ts = ns2usecs(rel_ts);
558 }
559
560 if (verbose && in_ns) {
561 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
562 unsigned long abs_msec = (unsigned long)abs_ts;
563 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
564 unsigned long rel_msec = (unsigned long)rel_ts;
565
566 trace_seq_printf(
567 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
568 ns2usecs(iter->ts),
569 abs_msec, abs_usec,
570 rel_msec, rel_usec);
571
572 } else if (verbose && !in_ns) {
573 trace_seq_printf(
574 s, "[%016llx] %lld (+%lld): ",
575 iter->ts, abs_ts, rel_ts);
576
577 } else if (!verbose && in_ns) {
578 trace_seq_printf(
579 s, " %4lldus%c: ",
580 abs_ts,
581 trace_find_mark(rel_ts * NSEC_PER_USEC));
582
583 } else { /* !verbose && !in_ns */
584 trace_seq_printf(s, " %4lld: ", abs_ts);
585 }
586
587 return !trace_seq_has_overflowed(s);
588}
589
590static void trace_print_time(struct trace_seq *s, struct trace_iterator *iter,
591 unsigned long long ts)
592{
593 unsigned long secs, usec_rem;
594 unsigned long long t;
595
596 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
597 t = ns2usecs(ts);
598 usec_rem = do_div(t, USEC_PER_SEC);
599 secs = (unsigned long)t;
600 trace_seq_printf(s, " %5lu.%06lu", secs, usec_rem);
601 } else
602 trace_seq_printf(s, " %12llu", ts);
603}
604
605int trace_print_context(struct trace_iterator *iter)
606{
607 struct trace_array *tr = iter->tr;
608 struct trace_seq *s = &iter->seq;
609 struct trace_entry *entry = iter->ent;
610 char comm[TASK_COMM_LEN];
611
612 trace_find_cmdline(entry->pid, comm);
613
614 trace_seq_printf(s, "%16s-%-7d ", comm, entry->pid);
615
616 if (tr->trace_flags & TRACE_ITER_RECORD_TGID) {
617 unsigned int tgid = trace_find_tgid(entry->pid);
618
619 if (!tgid)
620 trace_seq_printf(s, "(-------) ");
621 else
622 trace_seq_printf(s, "(%7d) ", tgid);
623 }
624
625 trace_seq_printf(s, "[%03d] ", iter->cpu);
626
627 if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
628 trace_print_lat_fmt(s, entry);
629
630 trace_print_time(s, iter, iter->ts);
631 trace_seq_puts(s, ": ");
632
633 return !trace_seq_has_overflowed(s);
634}
635
636int trace_print_lat_context(struct trace_iterator *iter)
637{
638 struct trace_entry *entry, *next_entry;
639 struct trace_array *tr = iter->tr;
640 struct trace_seq *s = &iter->seq;
641 unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
642 u64 next_ts;
643
644 next_entry = trace_find_next_entry(iter, NULL, &next_ts);
645 if (!next_entry)
646 next_ts = iter->ts;
647
648 /* trace_find_next_entry() may change iter->ent */
649 entry = iter->ent;
650
651 if (verbose) {
652 char comm[TASK_COMM_LEN];
653
654 trace_find_cmdline(entry->pid, comm);
655
656 trace_seq_printf(
657 s, "%16s %7d %3d %d %08x %08lx ",
658 comm, entry->pid, iter->cpu, entry->flags,
659 entry->preempt_count, iter->idx);
660 } else {
661 lat_print_generic(s, entry, iter->cpu);
662 }
663
664 lat_print_timestamp(iter, next_ts);
665
666 return !trace_seq_has_overflowed(s);
667}
668
669/**
670 * ftrace_find_event - find a registered event
671 * @type: the type of event to look for
672 *
673 * Returns an event of type @type otherwise NULL
674 * Called with trace_event_read_lock() held.
675 */
676struct trace_event *ftrace_find_event(int type)
677{
678 struct trace_event *event;
679 unsigned key;
680
681 key = type & (EVENT_HASHSIZE - 1);
682
683 hlist_for_each_entry(event, &event_hash[key], node) {
684 if (event->type == type)
685 return event;
686 }
687
688 return NULL;
689}
690
691static LIST_HEAD(ftrace_event_list);
692
693static int trace_search_list(struct list_head **list)
694{
695 struct trace_event *e;
696 int next = __TRACE_LAST_TYPE;
697
698 if (list_empty(&ftrace_event_list)) {
699 *list = &ftrace_event_list;
700 return next;
701 }
702
703 /*
704 * We used up all possible max events,
705 * lets see if somebody freed one.
706 */
707 list_for_each_entry(e, &ftrace_event_list, list) {
708 if (e->type != next)
709 break;
710 next++;
711 }
712
713 /* Did we used up all 65 thousand events??? */
714 if (next > TRACE_EVENT_TYPE_MAX)
715 return 0;
716
717 *list = &e->list;
718 return next;
719}
720
721void trace_event_read_lock(void)
722{
723 down_read(&trace_event_sem);
724}
725
726void trace_event_read_unlock(void)
727{
728 up_read(&trace_event_sem);
729}
730
731/**
732 * register_trace_event - register output for an event type
733 * @event: the event type to register
734 *
735 * Event types are stored in a hash and this hash is used to
736 * find a way to print an event. If the @event->type is set
737 * then it will use that type, otherwise it will assign a
738 * type to use.
739 *
740 * If you assign your own type, please make sure it is added
741 * to the trace_type enum in trace.h, to avoid collisions
742 * with the dynamic types.
743 *
744 * Returns the event type number or zero on error.
745 */
746int register_trace_event(struct trace_event *event)
747{
748 unsigned key;
749 int ret = 0;
750
751 down_write(&trace_event_sem);
752
753 if (WARN_ON(!event))
754 goto out;
755
756 if (WARN_ON(!event->funcs))
757 goto out;
758
759 INIT_LIST_HEAD(&event->list);
760
761 if (!event->type) {
762 struct list_head *list = NULL;
763
764 if (next_event_type > TRACE_EVENT_TYPE_MAX) {
765
766 event->type = trace_search_list(&list);
767 if (!event->type)
768 goto out;
769
770 } else {
771
772 event->type = next_event_type++;
773 list = &ftrace_event_list;
774 }
775
776 if (WARN_ON(ftrace_find_event(event->type)))
777 goto out;
778
779 list_add_tail(&event->list, list);
780
781 } else if (event->type > __TRACE_LAST_TYPE) {
782 printk(KERN_WARNING "Need to add type to trace.h\n");
783 WARN_ON(1);
784 goto out;
785 } else {
786 /* Is this event already used */
787 if (ftrace_find_event(event->type))
788 goto out;
789 }
790
791 if (event->funcs->trace == NULL)
792 event->funcs->trace = trace_nop_print;
793 if (event->funcs->raw == NULL)
794 event->funcs->raw = trace_nop_print;
795 if (event->funcs->hex == NULL)
796 event->funcs->hex = trace_nop_print;
797 if (event->funcs->binary == NULL)
798 event->funcs->binary = trace_nop_print;
799
800 key = event->type & (EVENT_HASHSIZE - 1);
801
802 hlist_add_head(&event->node, &event_hash[key]);
803
804 ret = event->type;
805 out:
806 up_write(&trace_event_sem);
807
808 return ret;
809}
810EXPORT_SYMBOL_GPL(register_trace_event);
811
812/*
813 * Used by module code with the trace_event_sem held for write.
814 */
815int __unregister_trace_event(struct trace_event *event)
816{
817 hlist_del(&event->node);
818 list_del(&event->list);
819 return 0;
820}
821
822/**
823 * unregister_trace_event - remove a no longer used event
824 * @event: the event to remove
825 */
826int unregister_trace_event(struct trace_event *event)
827{
828 down_write(&trace_event_sem);
829 __unregister_trace_event(event);
830 up_write(&trace_event_sem);
831
832 return 0;
833}
834EXPORT_SYMBOL_GPL(unregister_trace_event);
835
836/*
837 * Standard events
838 */
839
840enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
841 struct trace_event *event)
842{
843 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
844
845 return trace_handle_return(&iter->seq);
846}
847
848static void print_fn_trace(struct trace_seq *s, unsigned long ip,
849 unsigned long parent_ip, int flags)
850{
851 seq_print_ip_sym(s, ip, flags);
852
853 if ((flags & TRACE_ITER_PRINT_PARENT) && parent_ip) {
854 trace_seq_puts(s, " <-");
855 seq_print_ip_sym(s, parent_ip, flags);
856 }
857}
858
859/* TRACE_FN */
860static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
861 struct trace_event *event)
862{
863 struct ftrace_entry *field;
864 struct trace_seq *s = &iter->seq;
865
866 trace_assign_type(field, iter->ent);
867
868 print_fn_trace(s, field->ip, field->parent_ip, flags);
869 trace_seq_putc(s, '\n');
870
871 return trace_handle_return(s);
872}
873
874static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
875 struct trace_event *event)
876{
877 struct ftrace_entry *field;
878
879 trace_assign_type(field, iter->ent);
880
881 trace_seq_printf(&iter->seq, "%lx %lx\n",
882 field->ip,
883 field->parent_ip);
884
885 return trace_handle_return(&iter->seq);
886}
887
888static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
889 struct trace_event *event)
890{
891 struct ftrace_entry *field;
892 struct trace_seq *s = &iter->seq;
893
894 trace_assign_type(field, iter->ent);
895
896 SEQ_PUT_HEX_FIELD(s, field->ip);
897 SEQ_PUT_HEX_FIELD(s, field->parent_ip);
898
899 return trace_handle_return(s);
900}
901
902static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
903 struct trace_event *event)
904{
905 struct ftrace_entry *field;
906 struct trace_seq *s = &iter->seq;
907
908 trace_assign_type(field, iter->ent);
909
910 SEQ_PUT_FIELD(s, field->ip);
911 SEQ_PUT_FIELD(s, field->parent_ip);
912
913 return trace_handle_return(s);
914}
915
916static struct trace_event_functions trace_fn_funcs = {
917 .trace = trace_fn_trace,
918 .raw = trace_fn_raw,
919 .hex = trace_fn_hex,
920 .binary = trace_fn_bin,
921};
922
923static struct trace_event trace_fn_event = {
924 .type = TRACE_FN,
925 .funcs = &trace_fn_funcs,
926};
927
928/* TRACE_CTX an TRACE_WAKE */
929static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
930 char *delim)
931{
932 struct ctx_switch_entry *field;
933 char comm[TASK_COMM_LEN];
934 int S, T;
935
936
937 trace_assign_type(field, iter->ent);
938
939 T = task_index_to_char(field->next_state);
940 S = task_index_to_char(field->prev_state);
941 trace_find_cmdline(field->next_pid, comm);
942 trace_seq_printf(&iter->seq,
943 " %7d:%3d:%c %s [%03d] %7d:%3d:%c %s\n",
944 field->prev_pid,
945 field->prev_prio,
946 S, delim,
947 field->next_cpu,
948 field->next_pid,
949 field->next_prio,
950 T, comm);
951
952 return trace_handle_return(&iter->seq);
953}
954
955static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
956 struct trace_event *event)
957{
958 return trace_ctxwake_print(iter, "==>");
959}
960
961static enum print_line_t trace_wake_print(struct trace_iterator *iter,
962 int flags, struct trace_event *event)
963{
964 return trace_ctxwake_print(iter, " +");
965}
966
967static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
968{
969 struct ctx_switch_entry *field;
970 int T;
971
972 trace_assign_type(field, iter->ent);
973
974 if (!S)
975 S = task_index_to_char(field->prev_state);
976 T = task_index_to_char(field->next_state);
977 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
978 field->prev_pid,
979 field->prev_prio,
980 S,
981 field->next_cpu,
982 field->next_pid,
983 field->next_prio,
984 T);
985
986 return trace_handle_return(&iter->seq);
987}
988
989static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
990 struct trace_event *event)
991{
992 return trace_ctxwake_raw(iter, 0);
993}
994
995static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
996 struct trace_event *event)
997{
998 return trace_ctxwake_raw(iter, '+');
999}
1000
1001
1002static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
1003{
1004 struct ctx_switch_entry *field;
1005 struct trace_seq *s = &iter->seq;
1006 int T;
1007
1008 trace_assign_type(field, iter->ent);
1009
1010 if (!S)
1011 S = task_index_to_char(field->prev_state);
1012 T = task_index_to_char(field->next_state);
1013
1014 SEQ_PUT_HEX_FIELD(s, field->prev_pid);
1015 SEQ_PUT_HEX_FIELD(s, field->prev_prio);
1016 SEQ_PUT_HEX_FIELD(s, S);
1017 SEQ_PUT_HEX_FIELD(s, field->next_cpu);
1018 SEQ_PUT_HEX_FIELD(s, field->next_pid);
1019 SEQ_PUT_HEX_FIELD(s, field->next_prio);
1020 SEQ_PUT_HEX_FIELD(s, T);
1021
1022 return trace_handle_return(s);
1023}
1024
1025static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1026 struct trace_event *event)
1027{
1028 return trace_ctxwake_hex(iter, 0);
1029}
1030
1031static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1032 struct trace_event *event)
1033{
1034 return trace_ctxwake_hex(iter, '+');
1035}
1036
1037static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1038 int flags, struct trace_event *event)
1039{
1040 struct ctx_switch_entry *field;
1041 struct trace_seq *s = &iter->seq;
1042
1043 trace_assign_type(field, iter->ent);
1044
1045 SEQ_PUT_FIELD(s, field->prev_pid);
1046 SEQ_PUT_FIELD(s, field->prev_prio);
1047 SEQ_PUT_FIELD(s, field->prev_state);
1048 SEQ_PUT_FIELD(s, field->next_cpu);
1049 SEQ_PUT_FIELD(s, field->next_pid);
1050 SEQ_PUT_FIELD(s, field->next_prio);
1051 SEQ_PUT_FIELD(s, field->next_state);
1052
1053 return trace_handle_return(s);
1054}
1055
1056static struct trace_event_functions trace_ctx_funcs = {
1057 .trace = trace_ctx_print,
1058 .raw = trace_ctx_raw,
1059 .hex = trace_ctx_hex,
1060 .binary = trace_ctxwake_bin,
1061};
1062
1063static struct trace_event trace_ctx_event = {
1064 .type = TRACE_CTX,
1065 .funcs = &trace_ctx_funcs,
1066};
1067
1068static struct trace_event_functions trace_wake_funcs = {
1069 .trace = trace_wake_print,
1070 .raw = trace_wake_raw,
1071 .hex = trace_wake_hex,
1072 .binary = trace_ctxwake_bin,
1073};
1074
1075static struct trace_event trace_wake_event = {
1076 .type = TRACE_WAKE,
1077 .funcs = &trace_wake_funcs,
1078};
1079
1080/* TRACE_STACK */
1081
1082static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1083 int flags, struct trace_event *event)
1084{
1085 struct stack_entry *field;
1086 struct trace_seq *s = &iter->seq;
1087 unsigned long *p;
1088 unsigned long *end;
1089
1090 trace_assign_type(field, iter->ent);
1091 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1092
1093 trace_seq_puts(s, "<stack trace>\n");
1094
1095 for (p = field->caller; p && p < end && *p != ULONG_MAX; p++) {
1096
1097 if (trace_seq_has_overflowed(s))
1098 break;
1099
1100 trace_seq_puts(s, " => ");
1101 seq_print_ip_sym(s, *p, flags);
1102 trace_seq_putc(s, '\n');
1103 }
1104
1105 return trace_handle_return(s);
1106}
1107
1108static struct trace_event_functions trace_stack_funcs = {
1109 .trace = trace_stack_print,
1110};
1111
1112static struct trace_event trace_stack_event = {
1113 .type = TRACE_STACK,
1114 .funcs = &trace_stack_funcs,
1115};
1116
1117/* TRACE_USER_STACK */
1118static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1119 int flags, struct trace_event *event)
1120{
1121 struct trace_array *tr = iter->tr;
1122 struct userstack_entry *field;
1123 struct trace_seq *s = &iter->seq;
1124 struct mm_struct *mm = NULL;
1125 unsigned int i;
1126
1127 trace_assign_type(field, iter->ent);
1128
1129 trace_seq_puts(s, "<user stack trace>\n");
1130
1131 if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
1132 struct task_struct *task;
1133 /*
1134 * we do the lookup on the thread group leader,
1135 * since individual threads might have already quit!
1136 */
1137 rcu_read_lock();
1138 task = find_task_by_vpid(field->tgid);
1139 if (task)
1140 mm = get_task_mm(task);
1141 rcu_read_unlock();
1142 }
1143
1144 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1145 unsigned long ip = field->caller[i];
1146
1147 if (!ip || trace_seq_has_overflowed(s))
1148 break;
1149
1150 trace_seq_puts(s, " => ");
1151 seq_print_user_ip(s, mm, ip, flags);
1152 trace_seq_putc(s, '\n');
1153 }
1154
1155 if (mm)
1156 mmput(mm);
1157
1158 return trace_handle_return(s);
1159}
1160
1161static struct trace_event_functions trace_user_stack_funcs = {
1162 .trace = trace_user_stack_print,
1163};
1164
1165static struct trace_event trace_user_stack_event = {
1166 .type = TRACE_USER_STACK,
1167 .funcs = &trace_user_stack_funcs,
1168};
1169
1170/* TRACE_HWLAT */
1171static enum print_line_t
1172trace_hwlat_print(struct trace_iterator *iter, int flags,
1173 struct trace_event *event)
1174{
1175 struct trace_entry *entry = iter->ent;
1176 struct trace_seq *s = &iter->seq;
1177 struct hwlat_entry *field;
1178
1179 trace_assign_type(field, entry);
1180
1181 trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld count:%d",
1182 field->seqnum,
1183 field->duration,
1184 field->outer_duration,
1185 (long long)field->timestamp.tv_sec,
1186 field->timestamp.tv_nsec, field->count);
1187
1188 if (field->nmi_count) {
1189 /*
1190 * The generic sched_clock() is not NMI safe, thus
1191 * we only record the count and not the time.
1192 */
1193 if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK))
1194 trace_seq_printf(s, " nmi-total:%llu",
1195 field->nmi_total_ts);
1196 trace_seq_printf(s, " nmi-count:%u",
1197 field->nmi_count);
1198 }
1199
1200 trace_seq_putc(s, '\n');
1201
1202 return trace_handle_return(s);
1203}
1204
1205static enum print_line_t
1206trace_hwlat_raw(struct trace_iterator *iter, int flags,
1207 struct trace_event *event)
1208{
1209 struct hwlat_entry *field;
1210 struct trace_seq *s = &iter->seq;
1211
1212 trace_assign_type(field, iter->ent);
1213
1214 trace_seq_printf(s, "%llu %lld %lld %09ld %u\n",
1215 field->duration,
1216 field->outer_duration,
1217 (long long)field->timestamp.tv_sec,
1218 field->timestamp.tv_nsec,
1219 field->seqnum);
1220
1221 return trace_handle_return(s);
1222}
1223
1224static struct trace_event_functions trace_hwlat_funcs = {
1225 .trace = trace_hwlat_print,
1226 .raw = trace_hwlat_raw,
1227};
1228
1229static struct trace_event trace_hwlat_event = {
1230 .type = TRACE_HWLAT,
1231 .funcs = &trace_hwlat_funcs,
1232};
1233
1234/* TRACE_OSNOISE */
1235static enum print_line_t
1236trace_osnoise_print(struct trace_iterator *iter, int flags,
1237 struct trace_event *event)
1238{
1239 struct trace_entry *entry = iter->ent;
1240 struct trace_seq *s = &iter->seq;
1241 struct osnoise_entry *field;
1242 u64 ratio, ratio_dec;
1243 u64 net_runtime;
1244
1245 trace_assign_type(field, entry);
1246
1247 /*
1248 * compute the available % of cpu time.
1249 */
1250 net_runtime = field->runtime - field->noise;
1251 ratio = net_runtime * 10000000;
1252 do_div(ratio, field->runtime);
1253 ratio_dec = do_div(ratio, 100000);
1254
1255 trace_seq_printf(s, "%llu %10llu %3llu.%05llu %7llu",
1256 field->runtime,
1257 field->noise,
1258 ratio, ratio_dec,
1259 field->max_sample);
1260
1261 trace_seq_printf(s, " %6u", field->hw_count);
1262 trace_seq_printf(s, " %6u", field->nmi_count);
1263 trace_seq_printf(s, " %6u", field->irq_count);
1264 trace_seq_printf(s, " %6u", field->softirq_count);
1265 trace_seq_printf(s, " %6u", field->thread_count);
1266
1267 trace_seq_putc(s, '\n');
1268
1269 return trace_handle_return(s);
1270}
1271
1272static enum print_line_t
1273trace_osnoise_raw(struct trace_iterator *iter, int flags,
1274 struct trace_event *event)
1275{
1276 struct osnoise_entry *field;
1277 struct trace_seq *s = &iter->seq;
1278
1279 trace_assign_type(field, iter->ent);
1280
1281 trace_seq_printf(s, "%lld %llu %llu %u %u %u %u %u\n",
1282 field->runtime,
1283 field->noise,
1284 field->max_sample,
1285 field->hw_count,
1286 field->nmi_count,
1287 field->irq_count,
1288 field->softirq_count,
1289 field->thread_count);
1290
1291 return trace_handle_return(s);
1292}
1293
1294static struct trace_event_functions trace_osnoise_funcs = {
1295 .trace = trace_osnoise_print,
1296 .raw = trace_osnoise_raw,
1297};
1298
1299static struct trace_event trace_osnoise_event = {
1300 .type = TRACE_OSNOISE,
1301 .funcs = &trace_osnoise_funcs,
1302};
1303
1304/* TRACE_TIMERLAT */
1305static enum print_line_t
1306trace_timerlat_print(struct trace_iterator *iter, int flags,
1307 struct trace_event *event)
1308{
1309 struct trace_entry *entry = iter->ent;
1310 struct trace_seq *s = &iter->seq;
1311 struct timerlat_entry *field;
1312
1313 trace_assign_type(field, entry);
1314
1315 trace_seq_printf(s, "#%-5u context %6s timer_latency %9llu ns\n",
1316 field->seqnum,
1317 field->context ? "thread" : "irq",
1318 field->timer_latency);
1319
1320 return trace_handle_return(s);
1321}
1322
1323static enum print_line_t
1324trace_timerlat_raw(struct trace_iterator *iter, int flags,
1325 struct trace_event *event)
1326{
1327 struct timerlat_entry *field;
1328 struct trace_seq *s = &iter->seq;
1329
1330 trace_assign_type(field, iter->ent);
1331
1332 trace_seq_printf(s, "%u %d %llu\n",
1333 field->seqnum,
1334 field->context,
1335 field->timer_latency);
1336
1337 return trace_handle_return(s);
1338}
1339
1340static struct trace_event_functions trace_timerlat_funcs = {
1341 .trace = trace_timerlat_print,
1342 .raw = trace_timerlat_raw,
1343};
1344
1345static struct trace_event trace_timerlat_event = {
1346 .type = TRACE_TIMERLAT,
1347 .funcs = &trace_timerlat_funcs,
1348};
1349
1350/* TRACE_BPUTS */
1351static enum print_line_t
1352trace_bputs_print(struct trace_iterator *iter, int flags,
1353 struct trace_event *event)
1354{
1355 struct trace_entry *entry = iter->ent;
1356 struct trace_seq *s = &iter->seq;
1357 struct bputs_entry *field;
1358
1359 trace_assign_type(field, entry);
1360
1361 seq_print_ip_sym(s, field->ip, flags);
1362 trace_seq_puts(s, ": ");
1363 trace_seq_puts(s, field->str);
1364
1365 return trace_handle_return(s);
1366}
1367
1368
1369static enum print_line_t
1370trace_bputs_raw(struct trace_iterator *iter, int flags,
1371 struct trace_event *event)
1372{
1373 struct bputs_entry *field;
1374 struct trace_seq *s = &iter->seq;
1375
1376 trace_assign_type(field, iter->ent);
1377
1378 trace_seq_printf(s, ": %lx : ", field->ip);
1379 trace_seq_puts(s, field->str);
1380
1381 return trace_handle_return(s);
1382}
1383
1384static struct trace_event_functions trace_bputs_funcs = {
1385 .trace = trace_bputs_print,
1386 .raw = trace_bputs_raw,
1387};
1388
1389static struct trace_event trace_bputs_event = {
1390 .type = TRACE_BPUTS,
1391 .funcs = &trace_bputs_funcs,
1392};
1393
1394/* TRACE_BPRINT */
1395static enum print_line_t
1396trace_bprint_print(struct trace_iterator *iter, int flags,
1397 struct trace_event *event)
1398{
1399 struct trace_entry *entry = iter->ent;
1400 struct trace_seq *s = &iter->seq;
1401 struct bprint_entry *field;
1402
1403 trace_assign_type(field, entry);
1404
1405 seq_print_ip_sym(s, field->ip, flags);
1406 trace_seq_puts(s, ": ");
1407 trace_seq_bprintf(s, field->fmt, field->buf);
1408
1409 return trace_handle_return(s);
1410}
1411
1412
1413static enum print_line_t
1414trace_bprint_raw(struct trace_iterator *iter, int flags,
1415 struct trace_event *event)
1416{
1417 struct bprint_entry *field;
1418 struct trace_seq *s = &iter->seq;
1419
1420 trace_assign_type(field, iter->ent);
1421
1422 trace_seq_printf(s, ": %lx : ", field->ip);
1423 trace_seq_bprintf(s, field->fmt, field->buf);
1424
1425 return trace_handle_return(s);
1426}
1427
1428static struct trace_event_functions trace_bprint_funcs = {
1429 .trace = trace_bprint_print,
1430 .raw = trace_bprint_raw,
1431};
1432
1433static struct trace_event trace_bprint_event = {
1434 .type = TRACE_BPRINT,
1435 .funcs = &trace_bprint_funcs,
1436};
1437
1438/* TRACE_PRINT */
1439static enum print_line_t trace_print_print(struct trace_iterator *iter,
1440 int flags, struct trace_event *event)
1441{
1442 struct print_entry *field;
1443 struct trace_seq *s = &iter->seq;
1444
1445 trace_assign_type(field, iter->ent);
1446
1447 seq_print_ip_sym(s, field->ip, flags);
1448 trace_seq_printf(s, ": %s", field->buf);
1449
1450 return trace_handle_return(s);
1451}
1452
1453static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1454 struct trace_event *event)
1455{
1456 struct print_entry *field;
1457
1458 trace_assign_type(field, iter->ent);
1459
1460 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1461
1462 return trace_handle_return(&iter->seq);
1463}
1464
1465static struct trace_event_functions trace_print_funcs = {
1466 .trace = trace_print_print,
1467 .raw = trace_print_raw,
1468};
1469
1470static struct trace_event trace_print_event = {
1471 .type = TRACE_PRINT,
1472 .funcs = &trace_print_funcs,
1473};
1474
1475static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags,
1476 struct trace_event *event)
1477{
1478 struct raw_data_entry *field;
1479 int i;
1480
1481 trace_assign_type(field, iter->ent);
1482
1483 trace_seq_printf(&iter->seq, "# %x buf:", field->id);
1484
1485 for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++)
1486 trace_seq_printf(&iter->seq, " %02x",
1487 (unsigned char)field->buf[i]);
1488
1489 trace_seq_putc(&iter->seq, '\n');
1490
1491 return trace_handle_return(&iter->seq);
1492}
1493
1494static struct trace_event_functions trace_raw_data_funcs = {
1495 .trace = trace_raw_data,
1496 .raw = trace_raw_data,
1497};
1498
1499static struct trace_event trace_raw_data_event = {
1500 .type = TRACE_RAW_DATA,
1501 .funcs = &trace_raw_data_funcs,
1502};
1503
1504static enum print_line_t
1505trace_func_repeats_raw(struct trace_iterator *iter, int flags,
1506 struct trace_event *event)
1507{
1508 struct func_repeats_entry *field;
1509 struct trace_seq *s = &iter->seq;
1510
1511 trace_assign_type(field, iter->ent);
1512
1513 trace_seq_printf(s, "%lu %lu %u %llu\n",
1514 field->ip,
1515 field->parent_ip,
1516 field->count,
1517 FUNC_REPEATS_GET_DELTA_TS(field));
1518
1519 return trace_handle_return(s);
1520}
1521
1522static enum print_line_t
1523trace_func_repeats_print(struct trace_iterator *iter, int flags,
1524 struct trace_event *event)
1525{
1526 struct func_repeats_entry *field;
1527 struct trace_seq *s = &iter->seq;
1528
1529 trace_assign_type(field, iter->ent);
1530
1531 print_fn_trace(s, field->ip, field->parent_ip, flags);
1532 trace_seq_printf(s, " (repeats: %u, last_ts:", field->count);
1533 trace_print_time(s, iter,
1534 iter->ts - FUNC_REPEATS_GET_DELTA_TS(field));
1535 trace_seq_puts(s, ")\n");
1536
1537 return trace_handle_return(s);
1538}
1539
1540static struct trace_event_functions trace_func_repeats_funcs = {
1541 .trace = trace_func_repeats_print,
1542 .raw = trace_func_repeats_raw,
1543};
1544
1545static struct trace_event trace_func_repeats_event = {
1546 .type = TRACE_FUNC_REPEATS,
1547 .funcs = &trace_func_repeats_funcs,
1548};
1549
1550static struct trace_event *events[] __initdata = {
1551 &trace_fn_event,
1552 &trace_ctx_event,
1553 &trace_wake_event,
1554 &trace_stack_event,
1555 &trace_user_stack_event,
1556 &trace_bputs_event,
1557 &trace_bprint_event,
1558 &trace_print_event,
1559 &trace_hwlat_event,
1560 &trace_osnoise_event,
1561 &trace_timerlat_event,
1562 &trace_raw_data_event,
1563 &trace_func_repeats_event,
1564 NULL
1565};
1566
1567__init static int init_events(void)
1568{
1569 struct trace_event *event;
1570 int i, ret;
1571
1572 for (i = 0; events[i]; i++) {
1573 event = events[i];
1574
1575 ret = register_trace_event(event);
1576 if (!ret) {
1577 printk(KERN_WARNING "event %d failed to register\n",
1578 event->type);
1579 WARN_ON_ONCE(1);
1580 }
1581 }
1582
1583 return 0;
1584}
1585early_initcall(init_events);