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 DEFINE_PER_CPU(struct trace_seq, ftrace_event_seq);
20 EXPORT_PER_CPU_SYMBOL(ftrace_event_seq);
22 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
24 static int next_event_type = __TRACE_LAST_TYPE + 1;
26 void trace_print_seq(struct seq_file *m, struct trace_seq *s)
28 int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;
30 seq_write(m, s->buffer, len);
35 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
37 struct trace_seq *s = &iter->seq;
38 struct trace_entry *entry = iter->ent;
39 struct bprint_entry *field;
42 trace_assign_type(field, entry);
44 ret = trace_seq_bprintf(s, field->fmt, field->buf);
46 return TRACE_TYPE_PARTIAL_LINE;
48 return TRACE_TYPE_HANDLED;
51 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
53 struct trace_seq *s = &iter->seq;
54 struct trace_entry *entry = iter->ent;
55 struct print_entry *field;
58 trace_assign_type(field, entry);
60 ret = trace_seq_printf(s, "%s", field->buf);
62 return TRACE_TYPE_PARTIAL_LINE;
64 return TRACE_TYPE_HANDLED;
68 * trace_seq_printf - sequence printing of trace information
69 * @s: trace sequence descriptor
70 * @fmt: printf format string
72 * The tracer may use either sequence operations or its own
73 * copy to user routines. To simplify formating of a trace
74 * trace_seq_printf is used to store strings into a special
75 * buffer (@s). Then the output may be either used by
76 * the sequencer or pulled into another buffer.
79 trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
81 int len = (PAGE_SIZE - 1) - s->len;
89 ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
92 /* If we can't write it all, don't bother writing anything */
100 EXPORT_SYMBOL_GPL(trace_seq_printf);
103 * trace_seq_vprintf - sequence printing of trace information
104 * @s: trace sequence descriptor
105 * @fmt: printf format string
107 * The tracer may use either sequence operations or its own
108 * copy to user routines. To simplify formating of a trace
109 * trace_seq_printf is used to store strings into a special
110 * buffer (@s). Then the output may be either used by
111 * the sequencer or pulled into another buffer.
114 trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
116 int len = (PAGE_SIZE - 1) - s->len;
122 ret = vsnprintf(s->buffer + s->len, len, fmt, args);
124 /* If we can't write it all, don't bother writing anything */
132 EXPORT_SYMBOL_GPL(trace_seq_vprintf);
134 int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
136 int len = (PAGE_SIZE - 1) - s->len;
142 ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
144 /* If we can't write it all, don't bother writing anything */
154 * trace_seq_puts - trace sequence printing of simple string
155 * @s: trace sequence descriptor
156 * @str: simple string to record
158 * The tracer may use either the sequence operations or its own
159 * copy to user routines. This function records a simple string
160 * into a special buffer (@s) for later retrieval by a sequencer
161 * or other mechanism.
163 int trace_seq_puts(struct trace_seq *s, const char *str)
165 int len = strlen(str);
167 if (len > ((PAGE_SIZE - 1) - s->len))
170 memcpy(s->buffer + s->len, str, len);
176 int trace_seq_putc(struct trace_seq *s, unsigned char c)
178 if (s->len >= (PAGE_SIZE - 1))
181 s->buffer[s->len++] = c;
186 int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
188 if (len > ((PAGE_SIZE - 1) - s->len))
191 memcpy(s->buffer + s->len, mem, len);
197 int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
199 unsigned char hex[HEX_CHARS];
200 const unsigned char *data = mem;
204 for (i = 0, j = 0; i < len; i++) {
206 for (i = len-1, j = 0; i >= 0; i--) {
208 hex[j++] = hex_asc_hi(data[i]);
209 hex[j++] = hex_asc_lo(data[i]);
213 return trace_seq_putmem(s, hex, j);
216 void *trace_seq_reserve(struct trace_seq *s, size_t len)
220 if (len > ((PAGE_SIZE - 1) - s->len))
223 ret = s->buffer + s->len;
229 int trace_seq_path(struct trace_seq *s, struct path *path)
233 if (s->len >= (PAGE_SIZE - 1))
235 p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
237 p = mangle_path(s->buffer + s->len, p, "\n");
239 s->len = p - s->buffer;
243 s->buffer[s->len++] = '?';
251 ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
253 const struct trace_print_flags *flag_array)
257 const char *ret = p->buffer + p->len;
260 for (i = 0; flag_array[i].name && flags; i++) {
262 mask = flag_array[i].mask;
263 if ((flags & mask) != mask)
266 str = flag_array[i].name;
269 trace_seq_puts(p, delim);
270 trace_seq_puts(p, str);
273 /* check for left over flags */
276 trace_seq_puts(p, delim);
277 trace_seq_printf(p, "0x%lx", flags);
280 trace_seq_putc(p, 0);
284 EXPORT_SYMBOL(ftrace_print_flags_seq);
287 ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
288 const struct trace_print_flags *symbol_array)
291 const char *ret = p->buffer + p->len;
293 for (i = 0; symbol_array[i].name; i++) {
295 if (val != symbol_array[i].mask)
298 trace_seq_puts(p, symbol_array[i].name);
303 trace_seq_printf(p, "0x%lx", val);
305 trace_seq_putc(p, 0);
309 EXPORT_SYMBOL(ftrace_print_symbols_seq);
311 #ifdef CONFIG_KRETPROBES
312 static inline const char *kretprobed(const char *name)
314 static const char tramp_name[] = "kretprobe_trampoline";
315 int size = sizeof(tramp_name);
317 if (strncmp(tramp_name, name, size) == 0)
318 return "[unknown/kretprobe'd]";
322 static inline const char *kretprobed(const char *name)
326 #endif /* CONFIG_KRETPROBES */
329 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
331 #ifdef CONFIG_KALLSYMS
332 char str[KSYM_SYMBOL_LEN];
335 kallsyms_lookup(address, NULL, NULL, NULL, str);
337 name = kretprobed(str);
339 return trace_seq_printf(s, fmt, name);
345 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
346 unsigned long address)
348 #ifdef CONFIG_KALLSYMS
349 char str[KSYM_SYMBOL_LEN];
352 sprint_symbol(str, address);
353 name = kretprobed(str);
355 return trace_seq_printf(s, fmt, name);
361 # define IP_FMT "%08lx"
363 # define IP_FMT "%016lx"
366 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
367 unsigned long ip, unsigned long sym_flags)
369 struct file *file = NULL;
370 unsigned long vmstart = 0;
374 const struct vm_area_struct *vma;
376 down_read(&mm->mmap_sem);
377 vma = find_vma(mm, ip);
380 vmstart = vma->vm_start;
383 ret = trace_seq_path(s, &file->f_path);
385 ret = trace_seq_printf(s, "[+0x%lx]",
388 up_read(&mm->mmap_sem);
390 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
391 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
396 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
397 unsigned long sym_flags)
399 struct mm_struct *mm = NULL;
403 if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
404 struct task_struct *task;
406 * we do the lookup on the thread group leader,
407 * since individual threads might have already quit!
410 task = find_task_by_vpid(entry->tgid);
412 mm = get_task_mm(task);
416 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
417 unsigned long ip = entry->caller[i];
419 if (ip == ULONG_MAX || !ret)
422 ret = trace_seq_puts(s, " => ");
425 ret = trace_seq_puts(s, "??");
427 ret = trace_seq_puts(s, "\n");
433 ret = seq_print_user_ip(s, mm, ip, sym_flags);
434 ret = trace_seq_puts(s, "\n");
443 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
448 return trace_seq_printf(s, "0");
450 if (sym_flags & TRACE_ITER_SYM_OFFSET)
451 ret = seq_print_sym_offset(s, "%s", ip);
453 ret = seq_print_sym_short(s, "%s", ip);
458 if (sym_flags & TRACE_ITER_SYM_ADDR)
459 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
464 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
465 * @s: trace seq struct to write to
466 * @entry: The trace entry field from the ring buffer
468 * Prints the generic fields of irqs off, in hard or softirq, preempt
469 * count and lock depth.
471 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
473 int hardirq, softirq;
476 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
477 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
479 if (!trace_seq_printf(s, "%c%c%c",
480 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
481 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
483 (entry->flags & TRACE_FLAG_NEED_RESCHED) ?
485 (hardirq && softirq) ? 'H' :
486 hardirq ? 'h' : softirq ? 's' : '.'))
489 if (entry->preempt_count)
490 ret = trace_seq_printf(s, "%x", entry->preempt_count);
492 ret = trace_seq_putc(s, '.');
497 if (entry->lock_depth < 0)
498 return trace_seq_putc(s, '.');
500 return trace_seq_printf(s, "%d", entry->lock_depth);
504 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
506 char comm[TASK_COMM_LEN];
508 trace_find_cmdline(entry->pid, comm);
510 if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
511 comm, entry->pid, cpu))
514 return trace_print_lat_fmt(s, entry);
517 static unsigned long preempt_mark_thresh = 100;
520 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
521 unsigned long rel_usecs)
523 return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
524 rel_usecs > preempt_mark_thresh ? '!' :
525 rel_usecs > 1 ? '+' : ' ');
528 int trace_print_context(struct trace_iterator *iter)
530 struct trace_seq *s = &iter->seq;
531 struct trace_entry *entry = iter->ent;
532 unsigned long long t = ns2usecs(iter->ts);
533 unsigned long usec_rem = do_div(t, USEC_PER_SEC);
534 unsigned long secs = (unsigned long)t;
535 char comm[TASK_COMM_LEN];
537 trace_find_cmdline(entry->pid, comm);
539 return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
540 comm, entry->pid, iter->cpu, secs, usec_rem);
543 int trace_print_lat_context(struct trace_iterator *iter)
547 struct trace_seq *s = &iter->seq;
548 struct trace_entry *entry = iter->ent,
549 *next_entry = trace_find_next_entry(iter, NULL,
551 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
552 unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
553 unsigned long rel_usecs;
557 rel_usecs = ns2usecs(next_ts - iter->ts);
560 char comm[TASK_COMM_LEN];
562 trace_find_cmdline(entry->pid, comm);
564 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
565 " %ld.%03ldms (+%ld.%03ldms): ", comm,
566 entry->pid, iter->cpu, entry->flags,
567 entry->preempt_count, iter->idx,
569 abs_usecs / USEC_PER_MSEC,
570 abs_usecs % USEC_PER_MSEC,
571 rel_usecs / USEC_PER_MSEC,
572 rel_usecs % USEC_PER_MSEC);
574 ret = lat_print_generic(s, entry, iter->cpu);
576 ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
582 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
584 static int task_state_char(unsigned long state)
586 int bit = state ? __ffs(state) + 1 : 0;
588 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
592 * ftrace_find_event - find a registered event
593 * @type: the type of event to look for
595 * Returns an event of type @type otherwise NULL
596 * Called with trace_event_read_lock() held.
598 struct trace_event *ftrace_find_event(int type)
600 struct trace_event *event;
601 struct hlist_node *n;
604 key = type & (EVENT_HASHSIZE - 1);
606 hlist_for_each_entry(event, n, &event_hash[key], node) {
607 if (event->type == type)
614 static LIST_HEAD(ftrace_event_list);
616 static int trace_search_list(struct list_head **list)
618 struct trace_event *e;
619 int last = __TRACE_LAST_TYPE;
621 if (list_empty(&ftrace_event_list)) {
622 *list = &ftrace_event_list;
627 * We used up all possible max events,
628 * lets see if somebody freed one.
630 list_for_each_entry(e, &ftrace_event_list, list) {
631 if (e->type != last + 1)
636 /* Did we used up all 65 thousand events??? */
637 if ((last + 1) > FTRACE_MAX_EVENT)
644 void trace_event_read_lock(void)
646 down_read(&trace_event_mutex);
649 void trace_event_read_unlock(void)
651 up_read(&trace_event_mutex);
655 * register_ftrace_event - register output for an event type
656 * @event: the event type to register
658 * Event types are stored in a hash and this hash is used to
659 * find a way to print an event. If the @event->type is set
660 * then it will use that type, otherwise it will assign a
663 * If you assign your own type, please make sure it is added
664 * to the trace_type enum in trace.h, to avoid collisions
665 * with the dynamic types.
667 * Returns the event type number or zero on error.
669 int register_ftrace_event(struct trace_event *event)
674 down_write(&trace_event_mutex);
679 INIT_LIST_HEAD(&event->list);
682 struct list_head *list = NULL;
684 if (next_event_type > FTRACE_MAX_EVENT) {
686 event->type = trace_search_list(&list);
692 event->type = next_event_type++;
693 list = &ftrace_event_list;
696 if (WARN_ON(ftrace_find_event(event->type)))
699 list_add_tail(&event->list, list);
701 } else if (event->type > __TRACE_LAST_TYPE) {
702 printk(KERN_WARNING "Need to add type to trace.h\n");
706 /* Is this event already used */
707 if (ftrace_find_event(event->type))
711 if (event->trace == NULL)
712 event->trace = trace_nop_print;
713 if (event->raw == NULL)
714 event->raw = trace_nop_print;
715 if (event->hex == NULL)
716 event->hex = trace_nop_print;
717 if (event->binary == NULL)
718 event->binary = trace_nop_print;
720 key = event->type & (EVENT_HASHSIZE - 1);
722 hlist_add_head(&event->node, &event_hash[key]);
726 up_write(&trace_event_mutex);
730 EXPORT_SYMBOL_GPL(register_ftrace_event);
733 * Used by module code with the trace_event_mutex held for write.
735 int __unregister_ftrace_event(struct trace_event *event)
737 hlist_del(&event->node);
738 list_del(&event->list);
743 * unregister_ftrace_event - remove a no longer used event
744 * @event: the event to remove
746 int unregister_ftrace_event(struct trace_event *event)
748 down_write(&trace_event_mutex);
749 __unregister_ftrace_event(event);
750 up_write(&trace_event_mutex);
754 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
760 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags)
762 return TRACE_TYPE_HANDLED;
766 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags)
768 struct ftrace_entry *field;
769 struct trace_seq *s = &iter->seq;
771 trace_assign_type(field, iter->ent);
773 if (!seq_print_ip_sym(s, field->ip, flags))
776 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
777 if (!trace_seq_printf(s, " <-"))
779 if (!seq_print_ip_sym(s,
784 if (!trace_seq_printf(s, "\n"))
787 return TRACE_TYPE_HANDLED;
790 return TRACE_TYPE_PARTIAL_LINE;
793 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags)
795 struct ftrace_entry *field;
797 trace_assign_type(field, iter->ent);
799 if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
802 return TRACE_TYPE_PARTIAL_LINE;
804 return TRACE_TYPE_HANDLED;
807 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags)
809 struct ftrace_entry *field;
810 struct trace_seq *s = &iter->seq;
812 trace_assign_type(field, iter->ent);
814 SEQ_PUT_HEX_FIELD_RET(s, field->ip);
815 SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
817 return TRACE_TYPE_HANDLED;
820 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags)
822 struct ftrace_entry *field;
823 struct trace_seq *s = &iter->seq;
825 trace_assign_type(field, iter->ent);
827 SEQ_PUT_FIELD_RET(s, field->ip);
828 SEQ_PUT_FIELD_RET(s, field->parent_ip);
830 return TRACE_TYPE_HANDLED;
833 static struct trace_event trace_fn_event = {
835 .trace = trace_fn_trace,
838 .binary = trace_fn_bin,
841 /* TRACE_CTX an TRACE_WAKE */
842 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
845 struct ctx_switch_entry *field;
846 char comm[TASK_COMM_LEN];
850 trace_assign_type(field, iter->ent);
852 T = task_state_char(field->next_state);
853 S = task_state_char(field->prev_state);
854 trace_find_cmdline(field->next_pid, comm);
855 if (!trace_seq_printf(&iter->seq,
856 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
864 return TRACE_TYPE_PARTIAL_LINE;
866 return TRACE_TYPE_HANDLED;
869 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags)
871 return trace_ctxwake_print(iter, "==>");
874 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
877 return trace_ctxwake_print(iter, " +");
880 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
882 struct ctx_switch_entry *field;
885 trace_assign_type(field, iter->ent);
888 S = task_state_char(field->prev_state);
889 T = task_state_char(field->next_state);
890 if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
898 return TRACE_TYPE_PARTIAL_LINE;
900 return TRACE_TYPE_HANDLED;
903 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags)
905 return trace_ctxwake_raw(iter, 0);
908 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags)
910 return trace_ctxwake_raw(iter, '+');
914 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
916 struct ctx_switch_entry *field;
917 struct trace_seq *s = &iter->seq;
920 trace_assign_type(field, iter->ent);
923 S = task_state_char(field->prev_state);
924 T = task_state_char(field->next_state);
926 SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
927 SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
928 SEQ_PUT_HEX_FIELD_RET(s, S);
929 SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
930 SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
931 SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
932 SEQ_PUT_HEX_FIELD_RET(s, T);
934 return TRACE_TYPE_HANDLED;
937 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags)
939 return trace_ctxwake_hex(iter, 0);
942 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags)
944 return trace_ctxwake_hex(iter, '+');
947 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
950 struct ctx_switch_entry *field;
951 struct trace_seq *s = &iter->seq;
953 trace_assign_type(field, iter->ent);
955 SEQ_PUT_FIELD_RET(s, field->prev_pid);
956 SEQ_PUT_FIELD_RET(s, field->prev_prio);
957 SEQ_PUT_FIELD_RET(s, field->prev_state);
958 SEQ_PUT_FIELD_RET(s, field->next_pid);
959 SEQ_PUT_FIELD_RET(s, field->next_prio);
960 SEQ_PUT_FIELD_RET(s, field->next_state);
962 return TRACE_TYPE_HANDLED;
965 static struct trace_event trace_ctx_event = {
967 .trace = trace_ctx_print,
968 .raw = trace_ctx_raw,
969 .hex = trace_ctx_hex,
970 .binary = trace_ctxwake_bin,
973 static struct trace_event trace_wake_event = {
975 .trace = trace_wake_print,
976 .raw = trace_wake_raw,
977 .hex = trace_wake_hex,
978 .binary = trace_ctxwake_bin,
982 static enum print_line_t trace_special_print(struct trace_iterator *iter,
985 struct special_entry *field;
987 trace_assign_type(field, iter->ent);
989 if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
993 return TRACE_TYPE_PARTIAL_LINE;
995 return TRACE_TYPE_HANDLED;
998 static enum print_line_t trace_special_hex(struct trace_iterator *iter,
1001 struct special_entry *field;
1002 struct trace_seq *s = &iter->seq;
1004 trace_assign_type(field, iter->ent);
1006 SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
1007 SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
1008 SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
1010 return TRACE_TYPE_HANDLED;
1013 static enum print_line_t trace_special_bin(struct trace_iterator *iter,
1016 struct special_entry *field;
1017 struct trace_seq *s = &iter->seq;
1019 trace_assign_type(field, iter->ent);
1021 SEQ_PUT_FIELD_RET(s, field->arg1);
1022 SEQ_PUT_FIELD_RET(s, field->arg2);
1023 SEQ_PUT_FIELD_RET(s, field->arg3);
1025 return TRACE_TYPE_HANDLED;
1028 static struct trace_event trace_special_event = {
1029 .type = TRACE_SPECIAL,
1030 .trace = trace_special_print,
1031 .raw = trace_special_print,
1032 .hex = trace_special_hex,
1033 .binary = trace_special_bin,
1038 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1041 struct stack_entry *field;
1042 struct trace_seq *s = &iter->seq;
1045 trace_assign_type(field, iter->ent);
1047 if (!trace_seq_puts(s, "<stack trace>\n"))
1049 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1050 if (!field->caller[i] || (field->caller[i] == ULONG_MAX))
1052 if (!trace_seq_puts(s, " => "))
1055 if (!seq_print_ip_sym(s, field->caller[i], flags))
1057 if (!trace_seq_puts(s, "\n"))
1061 return TRACE_TYPE_HANDLED;
1064 return TRACE_TYPE_PARTIAL_LINE;
1067 static struct trace_event trace_stack_event = {
1068 .type = TRACE_STACK,
1069 .trace = trace_stack_print,
1070 .raw = trace_special_print,
1071 .hex = trace_special_hex,
1072 .binary = trace_special_bin,
1075 /* TRACE_USER_STACK */
1076 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1079 struct userstack_entry *field;
1080 struct trace_seq *s = &iter->seq;
1082 trace_assign_type(field, iter->ent);
1084 if (!trace_seq_puts(s, "<user stack trace>\n"))
1087 if (!seq_print_userip_objs(field, s, flags))
1090 return TRACE_TYPE_HANDLED;
1093 return TRACE_TYPE_PARTIAL_LINE;
1096 static struct trace_event trace_user_stack_event = {
1097 .type = TRACE_USER_STACK,
1098 .trace = trace_user_stack_print,
1099 .raw = trace_special_print,
1100 .hex = trace_special_hex,
1101 .binary = trace_special_bin,
1105 static enum print_line_t
1106 trace_bprint_print(struct trace_iterator *iter, int flags)
1108 struct trace_entry *entry = iter->ent;
1109 struct trace_seq *s = &iter->seq;
1110 struct bprint_entry *field;
1112 trace_assign_type(field, entry);
1114 if (!seq_print_ip_sym(s, field->ip, flags))
1117 if (!trace_seq_puts(s, ": "))
1120 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1123 return TRACE_TYPE_HANDLED;
1126 return TRACE_TYPE_PARTIAL_LINE;
1130 static enum print_line_t
1131 trace_bprint_raw(struct trace_iterator *iter, int flags)
1133 struct bprint_entry *field;
1134 struct trace_seq *s = &iter->seq;
1136 trace_assign_type(field, iter->ent);
1138 if (!trace_seq_printf(s, ": %lx : ", field->ip))
1141 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1144 return TRACE_TYPE_HANDLED;
1147 return TRACE_TYPE_PARTIAL_LINE;
1151 static struct trace_event trace_bprint_event = {
1152 .type = TRACE_BPRINT,
1153 .trace = trace_bprint_print,
1154 .raw = trace_bprint_raw,
1158 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1161 struct print_entry *field;
1162 struct trace_seq *s = &iter->seq;
1164 trace_assign_type(field, iter->ent);
1166 if (!seq_print_ip_sym(s, field->ip, flags))
1169 if (!trace_seq_printf(s, ": %s", field->buf))
1172 return TRACE_TYPE_HANDLED;
1175 return TRACE_TYPE_PARTIAL_LINE;
1178 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
1180 struct print_entry *field;
1182 trace_assign_type(field, iter->ent);
1184 if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1187 return TRACE_TYPE_HANDLED;
1190 return TRACE_TYPE_PARTIAL_LINE;
1193 static struct trace_event trace_print_event = {
1194 .type = TRACE_PRINT,
1195 .trace = trace_print_print,
1196 .raw = trace_print_raw,
1200 static struct trace_event *events[] __initdata = {
1204 &trace_special_event,
1206 &trace_user_stack_event,
1207 &trace_bprint_event,
1212 __init static int init_events(void)
1214 struct trace_event *event;
1217 for (i = 0; events[i]; i++) {
1220 ret = register_ftrace_event(event);
1222 printk(KERN_WARNING "event %d failed to register\n",
1230 device_initcall(init_events);