4 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
8 #include <linux/module.h>
9 #include <linux/mutex.h>
10 #include <linux/ftrace.h>
12 #include "trace_output.h"
14 /* must be a power of 2 */
15 #define EVENT_HASHSIZE 128
17 DECLARE_RWSEM(trace_event_mutex);
19 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
21 static int next_event_type = __TRACE_LAST_TYPE + 1;
23 int trace_print_seq(struct seq_file *m, struct trace_seq *s)
25 int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;
28 ret = seq_write(m, s->buffer, len);
31 * Only reset this buffer if we successfully wrote to the
40 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
42 struct trace_seq *s = &iter->seq;
43 struct trace_entry *entry = iter->ent;
44 struct bprint_entry *field;
47 trace_assign_type(field, entry);
49 ret = trace_seq_bprintf(s, field->fmt, field->buf);
51 return TRACE_TYPE_PARTIAL_LINE;
53 return TRACE_TYPE_HANDLED;
56 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
58 struct trace_seq *s = &iter->seq;
59 struct trace_entry *entry = iter->ent;
60 struct print_entry *field;
63 trace_assign_type(field, entry);
65 ret = trace_seq_printf(s, "%s", field->buf);
67 return TRACE_TYPE_PARTIAL_LINE;
69 return TRACE_TYPE_HANDLED;
73 * trace_seq_printf - sequence printing of trace information
74 * @s: trace sequence descriptor
75 * @fmt: printf format string
77 * It returns 0 if the trace oversizes the buffer's free
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.
87 trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
89 int len = (PAGE_SIZE - 1) - s->len;
97 ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
100 /* If we can't write it all, don't bother writing anything */
110 EXPORT_SYMBOL_GPL(trace_seq_printf);
113 * trace_seq_vprintf - sequence printing of trace information
114 * @s: trace sequence descriptor
115 * @fmt: printf format string
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.
124 trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
126 int len = (PAGE_SIZE - 1) - s->len;
132 ret = vsnprintf(s->buffer + s->len, len, fmt, args);
134 /* If we can't write it all, don't bother writing anything */
144 EXPORT_SYMBOL_GPL(trace_seq_vprintf);
146 int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
148 int len = (PAGE_SIZE - 1) - s->len;
154 ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
156 /* If we can't write it all, don't bother writing anything */
168 * trace_seq_puts - trace sequence printing of simple string
169 * @s: trace sequence descriptor
170 * @str: simple string to record
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.
177 int trace_seq_puts(struct trace_seq *s, const char *str)
179 int len = strlen(str);
184 if (len > ((PAGE_SIZE - 1) - s->len)) {
189 memcpy(s->buffer + s->len, str, len);
195 int trace_seq_putc(struct trace_seq *s, unsigned char c)
200 if (s->len >= (PAGE_SIZE - 1)) {
205 s->buffer[s->len++] = c;
209 EXPORT_SYMBOL(trace_seq_putc);
211 int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
216 if (len > ((PAGE_SIZE - 1) - s->len)) {
221 memcpy(s->buffer + s->len, mem, len);
227 int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
229 unsigned char hex[HEX_CHARS];
230 const unsigned char *data = mem;
237 for (i = 0, j = 0; i < len; i++) {
239 for (i = len-1, j = 0; i >= 0; i--) {
241 hex[j++] = hex_asc_hi(data[i]);
242 hex[j++] = hex_asc_lo(data[i]);
246 return trace_seq_putmem(s, hex, j);
249 void *trace_seq_reserve(struct trace_seq *s, size_t len)
256 if (len > ((PAGE_SIZE - 1) - s->len)) {
261 ret = s->buffer + s->len;
267 int trace_seq_path(struct trace_seq *s, struct path *path)
274 if (s->len >= (PAGE_SIZE - 1)) {
279 p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
281 p = mangle_path(s->buffer + s->len, p, "\n");
283 s->len = p - s->buffer;
287 s->buffer[s->len++] = '?';
296 ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
298 const struct trace_print_flags *flag_array)
302 const char *ret = p->buffer + p->len;
305 for (i = 0; flag_array[i].name && flags; i++) {
307 mask = flag_array[i].mask;
308 if ((flags & mask) != mask)
311 str = flag_array[i].name;
314 trace_seq_puts(p, delim);
315 trace_seq_puts(p, str);
318 /* check for left over flags */
321 trace_seq_puts(p, delim);
322 trace_seq_printf(p, "0x%lx", flags);
325 trace_seq_putc(p, 0);
329 EXPORT_SYMBOL(ftrace_print_flags_seq);
332 ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
333 const struct trace_print_flags *symbol_array)
336 const char *ret = p->buffer + p->len;
338 for (i = 0; symbol_array[i].name; i++) {
340 if (val != symbol_array[i].mask)
343 trace_seq_puts(p, symbol_array[i].name);
348 trace_seq_printf(p, "0x%lx", val);
350 trace_seq_putc(p, 0);
354 EXPORT_SYMBOL(ftrace_print_symbols_seq);
357 ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
360 const char *ret = p->buffer + p->len;
362 for (i = 0; i < buf_len; i++)
363 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
365 trace_seq_putc(p, 0);
369 EXPORT_SYMBOL(ftrace_print_hex_seq);
371 #ifdef CONFIG_KRETPROBES
372 static inline const char *kretprobed(const char *name)
374 static const char tramp_name[] = "kretprobe_trampoline";
375 int size = sizeof(tramp_name);
377 if (strncmp(tramp_name, name, size) == 0)
378 return "[unknown/kretprobe'd]";
382 static inline const char *kretprobed(const char *name)
386 #endif /* CONFIG_KRETPROBES */
389 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
391 #ifdef CONFIG_KALLSYMS
392 char str[KSYM_SYMBOL_LEN];
395 kallsyms_lookup(address, NULL, NULL, NULL, str);
397 name = kretprobed(str);
399 return trace_seq_printf(s, fmt, name);
405 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
406 unsigned long address)
408 #ifdef CONFIG_KALLSYMS
409 char str[KSYM_SYMBOL_LEN];
412 sprint_symbol(str, address);
413 name = kretprobed(str);
415 return trace_seq_printf(s, fmt, name);
421 # define IP_FMT "%08lx"
423 # define IP_FMT "%016lx"
426 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
427 unsigned long ip, unsigned long sym_flags)
429 struct file *file = NULL;
430 unsigned long vmstart = 0;
437 const struct vm_area_struct *vma;
439 down_read(&mm->mmap_sem);
440 vma = find_vma(mm, ip);
443 vmstart = vma->vm_start;
446 ret = trace_seq_path(s, &file->f_path);
448 ret = trace_seq_printf(s, "[+0x%lx]",
451 up_read(&mm->mmap_sem);
453 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
454 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
459 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
460 unsigned long sym_flags)
462 struct mm_struct *mm = NULL;
466 if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
467 struct task_struct *task;
469 * we do the lookup on the thread group leader,
470 * since individual threads might have already quit!
473 task = find_task_by_vpid(entry->tgid);
475 mm = get_task_mm(task);
479 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
480 unsigned long ip = entry->caller[i];
482 if (ip == ULONG_MAX || !ret)
485 ret = trace_seq_puts(s, " => ");
488 ret = trace_seq_puts(s, "??");
490 ret = trace_seq_puts(s, "\n");
496 ret = seq_print_user_ip(s, mm, ip, sym_flags);
497 ret = trace_seq_puts(s, "\n");
506 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
511 return trace_seq_printf(s, "0");
513 if (sym_flags & TRACE_ITER_SYM_OFFSET)
514 ret = seq_print_sym_offset(s, "%s", ip);
516 ret = seq_print_sym_short(s, "%s", ip);
521 if (sym_flags & TRACE_ITER_SYM_ADDR)
522 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
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
531 * Prints the generic fields of irqs off, in hard or softirq, preempt
534 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
543 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
544 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
547 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
548 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
551 (entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.';
553 (hardirq && softirq) ? 'H' :
558 if (!trace_seq_printf(s, "%c%c%c",
559 irqs_off, need_resched, hardsoft_irq))
562 if (entry->preempt_count)
563 ret = trace_seq_printf(s, "%x", entry->preempt_count);
565 ret = trace_seq_putc(s, '.');
571 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
573 char comm[TASK_COMM_LEN];
575 trace_find_cmdline(entry->pid, comm);
577 if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
578 comm, entry->pid, cpu))
581 return trace_print_lat_fmt(s, entry);
584 static unsigned long preempt_mark_thresh = 100;
587 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
588 unsigned long rel_usecs)
590 return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
591 rel_usecs > preempt_mark_thresh ? '!' :
592 rel_usecs > 1 ? '+' : ' ');
595 int trace_print_context(struct trace_iterator *iter)
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];
604 trace_find_cmdline(entry->pid, comm);
606 return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
607 comm, entry->pid, iter->cpu, secs, usec_rem);
610 int trace_print_lat_context(struct trace_iterator *iter)
614 struct trace_seq *s = &iter->seq;
615 struct trace_entry *entry = iter->ent,
616 *next_entry = trace_find_next_entry(iter, NULL,
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;
624 rel_usecs = ns2usecs(next_ts - iter->ts);
627 char comm[TASK_COMM_LEN];
629 trace_find_cmdline(entry->pid, comm);
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,
636 abs_usecs / USEC_PER_MSEC,
637 abs_usecs % USEC_PER_MSEC,
638 rel_usecs / USEC_PER_MSEC,
639 rel_usecs % USEC_PER_MSEC);
641 ret = lat_print_generic(s, entry, iter->cpu);
643 ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
649 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
651 static int task_state_char(unsigned long state)
653 int bit = state ? __ffs(state) + 1 : 0;
655 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
659 * ftrace_find_event - find a registered event
660 * @type: the type of event to look for
662 * Returns an event of type @type otherwise NULL
663 * Called with trace_event_read_lock() held.
665 struct trace_event *ftrace_find_event(int type)
667 struct trace_event *event;
668 struct hlist_node *n;
671 key = type & (EVENT_HASHSIZE - 1);
673 hlist_for_each_entry(event, n, &event_hash[key], node) {
674 if (event->type == type)
681 static LIST_HEAD(ftrace_event_list);
683 static int trace_search_list(struct list_head **list)
685 struct trace_event *e;
686 int last = __TRACE_LAST_TYPE;
688 if (list_empty(&ftrace_event_list)) {
689 *list = &ftrace_event_list;
694 * We used up all possible max events,
695 * lets see if somebody freed one.
697 list_for_each_entry(e, &ftrace_event_list, list) {
698 if (e->type != last + 1)
703 /* Did we used up all 65 thousand events??? */
704 if ((last + 1) > FTRACE_MAX_EVENT)
711 void trace_event_read_lock(void)
713 down_read(&trace_event_mutex);
716 void trace_event_read_unlock(void)
718 up_read(&trace_event_mutex);
722 * register_ftrace_event - register output for an event type
723 * @event: the event type to register
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
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.
734 * Returns the event type number or zero on error.
736 int register_ftrace_event(struct trace_event *event)
741 down_write(&trace_event_mutex);
746 if (WARN_ON(!event->funcs))
749 INIT_LIST_HEAD(&event->list);
752 struct list_head *list = NULL;
754 if (next_event_type > FTRACE_MAX_EVENT) {
756 event->type = trace_search_list(&list);
762 event->type = next_event_type++;
763 list = &ftrace_event_list;
766 if (WARN_ON(ftrace_find_event(event->type)))
769 list_add_tail(&event->list, list);
771 } else if (event->type > __TRACE_LAST_TYPE) {
772 printk(KERN_WARNING "Need to add type to trace.h\n");
776 /* Is this event already used */
777 if (ftrace_find_event(event->type))
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;
790 key = event->type & (EVENT_HASHSIZE - 1);
792 hlist_add_head(&event->node, &event_hash[key]);
796 up_write(&trace_event_mutex);
800 EXPORT_SYMBOL_GPL(register_ftrace_event);
803 * Used by module code with the trace_event_mutex held for write.
805 int __unregister_ftrace_event(struct trace_event *event)
807 hlist_del(&event->node);
808 list_del(&event->list);
813 * unregister_ftrace_event - remove a no longer used event
814 * @event: the event to remove
816 int unregister_ftrace_event(struct trace_event *event)
818 down_write(&trace_event_mutex);
819 __unregister_ftrace_event(event);
820 up_write(&trace_event_mutex);
824 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
830 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
831 struct trace_event *event)
833 if (!trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type))
834 return TRACE_TYPE_PARTIAL_LINE;
836 return TRACE_TYPE_HANDLED;
840 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
841 struct trace_event *event)
843 struct ftrace_entry *field;
844 struct trace_seq *s = &iter->seq;
846 trace_assign_type(field, iter->ent);
848 if (!seq_print_ip_sym(s, field->ip, flags))
851 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
852 if (!trace_seq_printf(s, " <-"))
854 if (!seq_print_ip_sym(s,
859 if (!trace_seq_printf(s, "\n"))
862 return TRACE_TYPE_HANDLED;
865 return TRACE_TYPE_PARTIAL_LINE;
868 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
869 struct trace_event *event)
871 struct ftrace_entry *field;
873 trace_assign_type(field, iter->ent);
875 if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
878 return TRACE_TYPE_PARTIAL_LINE;
880 return TRACE_TYPE_HANDLED;
883 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
884 struct trace_event *event)
886 struct ftrace_entry *field;
887 struct trace_seq *s = &iter->seq;
889 trace_assign_type(field, iter->ent);
891 SEQ_PUT_HEX_FIELD_RET(s, field->ip);
892 SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
894 return TRACE_TYPE_HANDLED;
897 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
898 struct trace_event *event)
900 struct ftrace_entry *field;
901 struct trace_seq *s = &iter->seq;
903 trace_assign_type(field, iter->ent);
905 SEQ_PUT_FIELD_RET(s, field->ip);
906 SEQ_PUT_FIELD_RET(s, field->parent_ip);
908 return TRACE_TYPE_HANDLED;
911 static struct trace_event_functions trace_fn_funcs = {
912 .trace = trace_fn_trace,
915 .binary = trace_fn_bin,
918 static struct trace_event trace_fn_event = {
920 .funcs = &trace_fn_funcs,
923 /* TRACE_CTX an TRACE_WAKE */
924 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
927 struct ctx_switch_entry *field;
928 char comm[TASK_COMM_LEN];
932 trace_assign_type(field, iter->ent);
934 T = task_state_char(field->next_state);
935 S = task_state_char(field->prev_state);
936 trace_find_cmdline(field->next_pid, comm);
937 if (!trace_seq_printf(&iter->seq,
938 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
946 return TRACE_TYPE_PARTIAL_LINE;
948 return TRACE_TYPE_HANDLED;
951 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
952 struct trace_event *event)
954 return trace_ctxwake_print(iter, "==>");
957 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
958 int flags, struct trace_event *event)
960 return trace_ctxwake_print(iter, " +");
963 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
965 struct ctx_switch_entry *field;
968 trace_assign_type(field, iter->ent);
971 S = task_state_char(field->prev_state);
972 T = task_state_char(field->next_state);
973 if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
981 return TRACE_TYPE_PARTIAL_LINE;
983 return TRACE_TYPE_HANDLED;
986 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
987 struct trace_event *event)
989 return trace_ctxwake_raw(iter, 0);
992 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
993 struct trace_event *event)
995 return trace_ctxwake_raw(iter, '+');
999 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
1001 struct ctx_switch_entry *field;
1002 struct trace_seq *s = &iter->seq;
1005 trace_assign_type(field, iter->ent);
1008 S = task_state_char(field->prev_state);
1009 T = task_state_char(field->next_state);
1011 SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
1012 SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
1013 SEQ_PUT_HEX_FIELD_RET(s, S);
1014 SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
1015 SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
1016 SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
1017 SEQ_PUT_HEX_FIELD_RET(s, T);
1019 return TRACE_TYPE_HANDLED;
1022 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1023 struct trace_event *event)
1025 return trace_ctxwake_hex(iter, 0);
1028 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1029 struct trace_event *event)
1031 return trace_ctxwake_hex(iter, '+');
1034 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1035 int flags, struct trace_event *event)
1037 struct ctx_switch_entry *field;
1038 struct trace_seq *s = &iter->seq;
1040 trace_assign_type(field, iter->ent);
1042 SEQ_PUT_FIELD_RET(s, field->prev_pid);
1043 SEQ_PUT_FIELD_RET(s, field->prev_prio);
1044 SEQ_PUT_FIELD_RET(s, field->prev_state);
1045 SEQ_PUT_FIELD_RET(s, field->next_pid);
1046 SEQ_PUT_FIELD_RET(s, field->next_prio);
1047 SEQ_PUT_FIELD_RET(s, field->next_state);
1049 return TRACE_TYPE_HANDLED;
1052 static struct trace_event_functions trace_ctx_funcs = {
1053 .trace = trace_ctx_print,
1054 .raw = trace_ctx_raw,
1055 .hex = trace_ctx_hex,
1056 .binary = trace_ctxwake_bin,
1059 static struct trace_event trace_ctx_event = {
1061 .funcs = &trace_ctx_funcs,
1064 static struct trace_event_functions trace_wake_funcs = {
1065 .trace = trace_wake_print,
1066 .raw = trace_wake_raw,
1067 .hex = trace_wake_hex,
1068 .binary = trace_ctxwake_bin,
1071 static struct trace_event trace_wake_event = {
1073 .funcs = &trace_wake_funcs,
1078 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1079 int flags, struct trace_event *event)
1081 struct stack_entry *field;
1082 struct trace_seq *s = &iter->seq;
1085 trace_assign_type(field, iter->ent);
1087 if (!trace_seq_puts(s, "<stack trace>\n"))
1089 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1090 if (!field->caller[i] || (field->caller[i] == ULONG_MAX))
1092 if (!trace_seq_puts(s, " => "))
1095 if (!seq_print_ip_sym(s, field->caller[i], flags))
1097 if (!trace_seq_puts(s, "\n"))
1101 return TRACE_TYPE_HANDLED;
1104 return TRACE_TYPE_PARTIAL_LINE;
1107 static struct trace_event_functions trace_stack_funcs = {
1108 .trace = trace_stack_print,
1111 static struct trace_event trace_stack_event = {
1112 .type = TRACE_STACK,
1113 .funcs = &trace_stack_funcs,
1116 /* TRACE_USER_STACK */
1117 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1118 int flags, struct trace_event *event)
1120 struct userstack_entry *field;
1121 struct trace_seq *s = &iter->seq;
1123 trace_assign_type(field, iter->ent);
1125 if (!trace_seq_puts(s, "<user stack trace>\n"))
1128 if (!seq_print_userip_objs(field, s, flags))
1131 return TRACE_TYPE_HANDLED;
1134 return TRACE_TYPE_PARTIAL_LINE;
1137 static struct trace_event_functions trace_user_stack_funcs = {
1138 .trace = trace_user_stack_print,
1141 static struct trace_event trace_user_stack_event = {
1142 .type = TRACE_USER_STACK,
1143 .funcs = &trace_user_stack_funcs,
1147 static enum print_line_t
1148 trace_bprint_print(struct trace_iterator *iter, int flags,
1149 struct trace_event *event)
1151 struct trace_entry *entry = iter->ent;
1152 struct trace_seq *s = &iter->seq;
1153 struct bprint_entry *field;
1155 trace_assign_type(field, entry);
1157 if (!seq_print_ip_sym(s, field->ip, flags))
1160 if (!trace_seq_puts(s, ": "))
1163 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1166 return TRACE_TYPE_HANDLED;
1169 return TRACE_TYPE_PARTIAL_LINE;
1173 static enum print_line_t
1174 trace_bprint_raw(struct trace_iterator *iter, int flags,
1175 struct trace_event *event)
1177 struct bprint_entry *field;
1178 struct trace_seq *s = &iter->seq;
1180 trace_assign_type(field, iter->ent);
1182 if (!trace_seq_printf(s, ": %lx : ", field->ip))
1185 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1188 return TRACE_TYPE_HANDLED;
1191 return TRACE_TYPE_PARTIAL_LINE;
1194 static struct trace_event_functions trace_bprint_funcs = {
1195 .trace = trace_bprint_print,
1196 .raw = trace_bprint_raw,
1199 static struct trace_event trace_bprint_event = {
1200 .type = TRACE_BPRINT,
1201 .funcs = &trace_bprint_funcs,
1205 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1206 int flags, struct trace_event *event)
1208 struct print_entry *field;
1209 struct trace_seq *s = &iter->seq;
1211 trace_assign_type(field, iter->ent);
1213 if (!seq_print_ip_sym(s, field->ip, flags))
1216 if (!trace_seq_printf(s, ": %s", field->buf))
1219 return TRACE_TYPE_HANDLED;
1222 return TRACE_TYPE_PARTIAL_LINE;
1225 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1226 struct trace_event *event)
1228 struct print_entry *field;
1230 trace_assign_type(field, iter->ent);
1232 if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1235 return TRACE_TYPE_HANDLED;
1238 return TRACE_TYPE_PARTIAL_LINE;
1241 static struct trace_event_functions trace_print_funcs = {
1242 .trace = trace_print_print,
1243 .raw = trace_print_raw,
1246 static struct trace_event trace_print_event = {
1247 .type = TRACE_PRINT,
1248 .funcs = &trace_print_funcs,
1252 static struct trace_event *events[] __initdata = {
1257 &trace_user_stack_event,
1258 &trace_bprint_event,
1263 __init static int init_events(void)
1265 struct trace_event *event;
1268 for (i = 0; events[i]; i++) {
1271 ret = register_ftrace_event(event);
1273 printk(KERN_WARNING "event %d failed to register\n",
1281 device_initcall(init_events);