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
532 * count and lock depth.
534 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
536 int hardirq, softirq;
539 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
540 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
542 if (!trace_seq_printf(s, "%c%c%c",
543 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
544 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
546 (entry->flags & TRACE_FLAG_NEED_RESCHED) ?
548 (hardirq && softirq) ? 'H' :
549 hardirq ? 'h' : softirq ? 's' : '.'))
552 if (entry->preempt_count)
553 ret = trace_seq_printf(s, "%x", entry->preempt_count);
555 ret = trace_seq_putc(s, '.');
560 if (entry->lock_depth < 0)
561 return trace_seq_putc(s, '.');
563 return trace_seq_printf(s, "%d", entry->lock_depth);
567 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
569 char comm[TASK_COMM_LEN];
571 trace_find_cmdline(entry->pid, comm);
573 if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
574 comm, entry->pid, cpu))
577 return trace_print_lat_fmt(s, entry);
580 static unsigned long preempt_mark_thresh = 100;
583 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
584 unsigned long rel_usecs)
586 return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
587 rel_usecs > preempt_mark_thresh ? '!' :
588 rel_usecs > 1 ? '+' : ' ');
591 int trace_print_context(struct trace_iterator *iter)
593 struct trace_seq *s = &iter->seq;
594 struct trace_entry *entry = iter->ent;
595 unsigned long long t = ns2usecs(iter->ts);
596 unsigned long usec_rem = do_div(t, USEC_PER_SEC);
597 unsigned long secs = (unsigned long)t;
598 char comm[TASK_COMM_LEN];
600 trace_find_cmdline(entry->pid, comm);
602 return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
603 comm, entry->pid, iter->cpu, secs, usec_rem);
606 int trace_print_lat_context(struct trace_iterator *iter)
610 struct trace_seq *s = &iter->seq;
611 struct trace_entry *entry = iter->ent,
612 *next_entry = trace_find_next_entry(iter, NULL,
614 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
615 unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
616 unsigned long rel_usecs;
620 rel_usecs = ns2usecs(next_ts - iter->ts);
623 char comm[TASK_COMM_LEN];
625 trace_find_cmdline(entry->pid, comm);
627 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
628 " %ld.%03ldms (+%ld.%03ldms): ", comm,
629 entry->pid, iter->cpu, entry->flags,
630 entry->preempt_count, iter->idx,
632 abs_usecs / USEC_PER_MSEC,
633 abs_usecs % USEC_PER_MSEC,
634 rel_usecs / USEC_PER_MSEC,
635 rel_usecs % USEC_PER_MSEC);
637 ret = lat_print_generic(s, entry, iter->cpu);
639 ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
645 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
647 static int task_state_char(unsigned long state)
649 int bit = state ? __ffs(state) + 1 : 0;
651 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
655 * ftrace_find_event - find a registered event
656 * @type: the type of event to look for
658 * Returns an event of type @type otherwise NULL
659 * Called with trace_event_read_lock() held.
661 struct trace_event *ftrace_find_event(int type)
663 struct trace_event *event;
664 struct hlist_node *n;
667 key = type & (EVENT_HASHSIZE - 1);
669 hlist_for_each_entry(event, n, &event_hash[key], node) {
670 if (event->type == type)
677 static LIST_HEAD(ftrace_event_list);
679 static int trace_search_list(struct list_head **list)
681 struct trace_event *e;
682 int last = __TRACE_LAST_TYPE;
684 if (list_empty(&ftrace_event_list)) {
685 *list = &ftrace_event_list;
690 * We used up all possible max events,
691 * lets see if somebody freed one.
693 list_for_each_entry(e, &ftrace_event_list, list) {
694 if (e->type != last + 1)
699 /* Did we used up all 65 thousand events??? */
700 if ((last + 1) > FTRACE_MAX_EVENT)
707 void trace_event_read_lock(void)
709 down_read(&trace_event_mutex);
712 void trace_event_read_unlock(void)
714 up_read(&trace_event_mutex);
718 * register_ftrace_event - register output for an event type
719 * @event: the event type to register
721 * Event types are stored in a hash and this hash is used to
722 * find a way to print an event. If the @event->type is set
723 * then it will use that type, otherwise it will assign a
726 * If you assign your own type, please make sure it is added
727 * to the trace_type enum in trace.h, to avoid collisions
728 * with the dynamic types.
730 * Returns the event type number or zero on error.
732 int register_ftrace_event(struct trace_event *event)
737 down_write(&trace_event_mutex);
742 if (WARN_ON(!event->funcs))
745 INIT_LIST_HEAD(&event->list);
748 struct list_head *list = NULL;
750 if (next_event_type > FTRACE_MAX_EVENT) {
752 event->type = trace_search_list(&list);
758 event->type = next_event_type++;
759 list = &ftrace_event_list;
762 if (WARN_ON(ftrace_find_event(event->type)))
765 list_add_tail(&event->list, list);
767 } else if (event->type > __TRACE_LAST_TYPE) {
768 printk(KERN_WARNING "Need to add type to trace.h\n");
772 /* Is this event already used */
773 if (ftrace_find_event(event->type))
777 if (event->funcs->trace == NULL)
778 event->funcs->trace = trace_nop_print;
779 if (event->funcs->raw == NULL)
780 event->funcs->raw = trace_nop_print;
781 if (event->funcs->hex == NULL)
782 event->funcs->hex = trace_nop_print;
783 if (event->funcs->binary == NULL)
784 event->funcs->binary = trace_nop_print;
786 key = event->type & (EVENT_HASHSIZE - 1);
788 hlist_add_head(&event->node, &event_hash[key]);
792 up_write(&trace_event_mutex);
796 EXPORT_SYMBOL_GPL(register_ftrace_event);
799 * Used by module code with the trace_event_mutex held for write.
801 int __unregister_ftrace_event(struct trace_event *event)
803 hlist_del(&event->node);
804 list_del(&event->list);
809 * unregister_ftrace_event - remove a no longer used event
810 * @event: the event to remove
812 int unregister_ftrace_event(struct trace_event *event)
814 down_write(&trace_event_mutex);
815 __unregister_ftrace_event(event);
816 up_write(&trace_event_mutex);
820 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
826 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
827 struct trace_event *event)
829 return TRACE_TYPE_HANDLED;
833 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
834 struct trace_event *event)
836 struct ftrace_entry *field;
837 struct trace_seq *s = &iter->seq;
839 trace_assign_type(field, iter->ent);
841 if (!seq_print_ip_sym(s, field->ip, flags))
844 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
845 if (!trace_seq_printf(s, " <-"))
847 if (!seq_print_ip_sym(s,
852 if (!trace_seq_printf(s, "\n"))
855 return TRACE_TYPE_HANDLED;
858 return TRACE_TYPE_PARTIAL_LINE;
861 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
862 struct trace_event *event)
864 struct ftrace_entry *field;
866 trace_assign_type(field, iter->ent);
868 if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
871 return TRACE_TYPE_PARTIAL_LINE;
873 return TRACE_TYPE_HANDLED;
876 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
877 struct trace_event *event)
879 struct ftrace_entry *field;
880 struct trace_seq *s = &iter->seq;
882 trace_assign_type(field, iter->ent);
884 SEQ_PUT_HEX_FIELD_RET(s, field->ip);
885 SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
887 return TRACE_TYPE_HANDLED;
890 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
891 struct trace_event *event)
893 struct ftrace_entry *field;
894 struct trace_seq *s = &iter->seq;
896 trace_assign_type(field, iter->ent);
898 SEQ_PUT_FIELD_RET(s, field->ip);
899 SEQ_PUT_FIELD_RET(s, field->parent_ip);
901 return TRACE_TYPE_HANDLED;
904 static struct trace_event_functions trace_fn_funcs = {
905 .trace = trace_fn_trace,
908 .binary = trace_fn_bin,
911 static struct trace_event trace_fn_event = {
913 .funcs = &trace_fn_funcs,
916 /* TRACE_CTX an TRACE_WAKE */
917 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
920 struct ctx_switch_entry *field;
921 char comm[TASK_COMM_LEN];
925 trace_assign_type(field, iter->ent);
927 T = task_state_char(field->next_state);
928 S = task_state_char(field->prev_state);
929 trace_find_cmdline(field->next_pid, comm);
930 if (!trace_seq_printf(&iter->seq,
931 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
939 return TRACE_TYPE_PARTIAL_LINE;
941 return TRACE_TYPE_HANDLED;
944 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
945 struct trace_event *event)
947 return trace_ctxwake_print(iter, "==>");
950 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
951 int flags, struct trace_event *event)
953 return trace_ctxwake_print(iter, " +");
956 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
958 struct ctx_switch_entry *field;
961 trace_assign_type(field, iter->ent);
964 S = task_state_char(field->prev_state);
965 T = task_state_char(field->next_state);
966 if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
974 return TRACE_TYPE_PARTIAL_LINE;
976 return TRACE_TYPE_HANDLED;
979 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
980 struct trace_event *event)
982 return trace_ctxwake_raw(iter, 0);
985 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
986 struct trace_event *event)
988 return trace_ctxwake_raw(iter, '+');
992 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
994 struct ctx_switch_entry *field;
995 struct trace_seq *s = &iter->seq;
998 trace_assign_type(field, iter->ent);
1001 S = task_state_char(field->prev_state);
1002 T = task_state_char(field->next_state);
1004 SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
1005 SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
1006 SEQ_PUT_HEX_FIELD_RET(s, S);
1007 SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
1008 SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
1009 SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
1010 SEQ_PUT_HEX_FIELD_RET(s, T);
1012 return TRACE_TYPE_HANDLED;
1015 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1016 struct trace_event *event)
1018 return trace_ctxwake_hex(iter, 0);
1021 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1022 struct trace_event *event)
1024 return trace_ctxwake_hex(iter, '+');
1027 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1028 int flags, struct trace_event *event)
1030 struct ctx_switch_entry *field;
1031 struct trace_seq *s = &iter->seq;
1033 trace_assign_type(field, iter->ent);
1035 SEQ_PUT_FIELD_RET(s, field->prev_pid);
1036 SEQ_PUT_FIELD_RET(s, field->prev_prio);
1037 SEQ_PUT_FIELD_RET(s, field->prev_state);
1038 SEQ_PUT_FIELD_RET(s, field->next_pid);
1039 SEQ_PUT_FIELD_RET(s, field->next_prio);
1040 SEQ_PUT_FIELD_RET(s, field->next_state);
1042 return TRACE_TYPE_HANDLED;
1045 static struct trace_event_functions trace_ctx_funcs = {
1046 .trace = trace_ctx_print,
1047 .raw = trace_ctx_raw,
1048 .hex = trace_ctx_hex,
1049 .binary = trace_ctxwake_bin,
1052 static struct trace_event trace_ctx_event = {
1054 .funcs = &trace_ctx_funcs,
1057 static struct trace_event_functions trace_wake_funcs = {
1058 .trace = trace_wake_print,
1059 .raw = trace_wake_raw,
1060 .hex = trace_wake_hex,
1061 .binary = trace_ctxwake_bin,
1064 static struct trace_event trace_wake_event = {
1066 .funcs = &trace_wake_funcs,
1071 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1072 int flags, struct trace_event *event)
1074 struct stack_entry *field;
1075 struct trace_seq *s = &iter->seq;
1078 trace_assign_type(field, iter->ent);
1080 if (!trace_seq_puts(s, "<stack trace>\n"))
1082 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1083 if (!field->caller[i] || (field->caller[i] == ULONG_MAX))
1085 if (!trace_seq_puts(s, " => "))
1088 if (!seq_print_ip_sym(s, field->caller[i], flags))
1090 if (!trace_seq_puts(s, "\n"))
1094 return TRACE_TYPE_HANDLED;
1097 return TRACE_TYPE_PARTIAL_LINE;
1100 static struct trace_event_functions trace_stack_funcs = {
1101 .trace = trace_stack_print,
1104 static struct trace_event trace_stack_event = {
1105 .type = TRACE_STACK,
1106 .funcs = &trace_stack_funcs,
1109 /* TRACE_USER_STACK */
1110 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1111 int flags, struct trace_event *event)
1113 struct userstack_entry *field;
1114 struct trace_seq *s = &iter->seq;
1116 trace_assign_type(field, iter->ent);
1118 if (!trace_seq_puts(s, "<user stack trace>\n"))
1121 if (!seq_print_userip_objs(field, s, flags))
1124 return TRACE_TYPE_HANDLED;
1127 return TRACE_TYPE_PARTIAL_LINE;
1130 static struct trace_event_functions trace_user_stack_funcs = {
1131 .trace = trace_user_stack_print,
1134 static struct trace_event trace_user_stack_event = {
1135 .type = TRACE_USER_STACK,
1136 .funcs = &trace_user_stack_funcs,
1140 static enum print_line_t
1141 trace_bprint_print(struct trace_iterator *iter, int flags,
1142 struct trace_event *event)
1144 struct trace_entry *entry = iter->ent;
1145 struct trace_seq *s = &iter->seq;
1146 struct bprint_entry *field;
1148 trace_assign_type(field, entry);
1150 if (!seq_print_ip_sym(s, field->ip, flags))
1153 if (!trace_seq_puts(s, ": "))
1156 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1159 return TRACE_TYPE_HANDLED;
1162 return TRACE_TYPE_PARTIAL_LINE;
1166 static enum print_line_t
1167 trace_bprint_raw(struct trace_iterator *iter, int flags,
1168 struct trace_event *event)
1170 struct bprint_entry *field;
1171 struct trace_seq *s = &iter->seq;
1173 trace_assign_type(field, iter->ent);
1175 if (!trace_seq_printf(s, ": %lx : ", field->ip))
1178 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1181 return TRACE_TYPE_HANDLED;
1184 return TRACE_TYPE_PARTIAL_LINE;
1187 static struct trace_event_functions trace_bprint_funcs = {
1188 .trace = trace_bprint_print,
1189 .raw = trace_bprint_raw,
1192 static struct trace_event trace_bprint_event = {
1193 .type = TRACE_BPRINT,
1194 .funcs = &trace_bprint_funcs,
1198 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1199 int flags, struct trace_event *event)
1201 struct print_entry *field;
1202 struct trace_seq *s = &iter->seq;
1204 trace_assign_type(field, iter->ent);
1206 if (!seq_print_ip_sym(s, field->ip, flags))
1209 if (!trace_seq_printf(s, ": %s", field->buf))
1212 return TRACE_TYPE_HANDLED;
1215 return TRACE_TYPE_PARTIAL_LINE;
1218 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1219 struct trace_event *event)
1221 struct print_entry *field;
1223 trace_assign_type(field, iter->ent);
1225 if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1228 return TRACE_TYPE_HANDLED;
1231 return TRACE_TYPE_PARTIAL_LINE;
1234 static struct trace_event_functions trace_print_funcs = {
1235 .trace = trace_print_print,
1236 .raw = trace_print_raw,
1239 static struct trace_event trace_print_event = {
1240 .type = TRACE_PRINT,
1241 .funcs = &trace_print_funcs,
1245 static struct trace_event *events[] __initdata = {
1250 &trace_user_stack_event,
1251 &trace_bprint_event,
1256 __init static int init_events(void)
1258 struct trace_event *event;
1261 for (i = 0; events[i]; i++) {
1264 ret = register_ftrace_event(event);
1266 printk(KERN_WARNING "event %d failed to register\n",
1274 device_initcall(init_events);