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->lock_depth < 0)
490 ret = trace_seq_putc(s, '.');
492 ret = trace_seq_printf(s, "%d", entry->lock_depth);
496 if (entry->preempt_count)
497 return trace_seq_printf(s, "%x", entry->preempt_count);
498 return trace_seq_putc(s, '.');
502 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
504 char comm[TASK_COMM_LEN];
506 trace_find_cmdline(entry->pid, comm);
508 if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
509 comm, entry->pid, cpu))
512 return trace_print_lat_fmt(s, entry);
515 static unsigned long preempt_mark_thresh = 100;
518 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
519 unsigned long rel_usecs)
521 return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
522 rel_usecs > preempt_mark_thresh ? '!' :
523 rel_usecs > 1 ? '+' : ' ');
526 int trace_print_context(struct trace_iterator *iter)
528 struct trace_seq *s = &iter->seq;
529 struct trace_entry *entry = iter->ent;
530 unsigned long long t = ns2usecs(iter->ts);
531 unsigned long usec_rem = do_div(t, USEC_PER_SEC);
532 unsigned long secs = (unsigned long)t;
533 char comm[TASK_COMM_LEN];
535 trace_find_cmdline(entry->pid, comm);
537 return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
538 comm, entry->pid, iter->cpu, secs, usec_rem);
541 int trace_print_lat_context(struct trace_iterator *iter)
545 struct trace_seq *s = &iter->seq;
546 struct trace_entry *entry = iter->ent,
547 *next_entry = trace_find_next_entry(iter, NULL,
549 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
550 unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
551 unsigned long rel_usecs;
555 rel_usecs = ns2usecs(next_ts - iter->ts);
558 char comm[TASK_COMM_LEN];
560 trace_find_cmdline(entry->pid, comm);
562 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
563 " %ld.%03ldms (+%ld.%03ldms): ", comm,
564 entry->pid, iter->cpu, entry->flags,
565 entry->preempt_count, iter->idx,
567 abs_usecs / USEC_PER_MSEC,
568 abs_usecs % USEC_PER_MSEC,
569 rel_usecs / USEC_PER_MSEC,
570 rel_usecs % USEC_PER_MSEC);
572 ret = lat_print_generic(s, entry, iter->cpu);
574 ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
580 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
582 static int task_state_char(unsigned long state)
584 int bit = state ? __ffs(state) + 1 : 0;
586 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
590 * ftrace_find_event - find a registered event
591 * @type: the type of event to look for
593 * Returns an event of type @type otherwise NULL
594 * Called with trace_event_read_lock() held.
596 struct trace_event *ftrace_find_event(int type)
598 struct trace_event *event;
599 struct hlist_node *n;
602 key = type & (EVENT_HASHSIZE - 1);
604 hlist_for_each_entry(event, n, &event_hash[key], node) {
605 if (event->type == type)
612 static LIST_HEAD(ftrace_event_list);
614 static int trace_search_list(struct list_head **list)
616 struct trace_event *e;
617 int last = __TRACE_LAST_TYPE;
619 if (list_empty(&ftrace_event_list)) {
620 *list = &ftrace_event_list;
625 * We used up all possible max events,
626 * lets see if somebody freed one.
628 list_for_each_entry(e, &ftrace_event_list, list) {
629 if (e->type != last + 1)
634 /* Did we used up all 65 thousand events??? */
635 if ((last + 1) > FTRACE_MAX_EVENT)
642 void trace_event_read_lock(void)
644 down_read(&trace_event_mutex);
647 void trace_event_read_unlock(void)
649 up_read(&trace_event_mutex);
653 * register_ftrace_event - register output for an event type
654 * @event: the event type to register
656 * Event types are stored in a hash and this hash is used to
657 * find a way to print an event. If the @event->type is set
658 * then it will use that type, otherwise it will assign a
661 * If you assign your own type, please make sure it is added
662 * to the trace_type enum in trace.h, to avoid collisions
663 * with the dynamic types.
665 * Returns the event type number or zero on error.
667 int register_ftrace_event(struct trace_event *event)
672 down_write(&trace_event_mutex);
677 INIT_LIST_HEAD(&event->list);
680 struct list_head *list = NULL;
682 if (next_event_type > FTRACE_MAX_EVENT) {
684 event->type = trace_search_list(&list);
690 event->type = next_event_type++;
691 list = &ftrace_event_list;
694 if (WARN_ON(ftrace_find_event(event->type)))
697 list_add_tail(&event->list, list);
699 } else if (event->type > __TRACE_LAST_TYPE) {
700 printk(KERN_WARNING "Need to add type to trace.h\n");
704 /* Is this event already used */
705 if (ftrace_find_event(event->type))
709 if (event->trace == NULL)
710 event->trace = trace_nop_print;
711 if (event->raw == NULL)
712 event->raw = trace_nop_print;
713 if (event->hex == NULL)
714 event->hex = trace_nop_print;
715 if (event->binary == NULL)
716 event->binary = trace_nop_print;
718 key = event->type & (EVENT_HASHSIZE - 1);
720 hlist_add_head(&event->node, &event_hash[key]);
724 up_write(&trace_event_mutex);
728 EXPORT_SYMBOL_GPL(register_ftrace_event);
731 * Used by module code with the trace_event_mutex held for write.
733 int __unregister_ftrace_event(struct trace_event *event)
735 hlist_del(&event->node);
736 list_del(&event->list);
741 * unregister_ftrace_event - remove a no longer used event
742 * @event: the event to remove
744 int unregister_ftrace_event(struct trace_event *event)
746 down_write(&trace_event_mutex);
747 __unregister_ftrace_event(event);
748 up_write(&trace_event_mutex);
752 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
758 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags)
760 return TRACE_TYPE_HANDLED;
764 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags)
766 struct ftrace_entry *field;
767 struct trace_seq *s = &iter->seq;
769 trace_assign_type(field, iter->ent);
771 if (!seq_print_ip_sym(s, field->ip, flags))
774 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
775 if (!trace_seq_printf(s, " <-"))
777 if (!seq_print_ip_sym(s,
782 if (!trace_seq_printf(s, "\n"))
785 return TRACE_TYPE_HANDLED;
788 return TRACE_TYPE_PARTIAL_LINE;
791 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags)
793 struct ftrace_entry *field;
795 trace_assign_type(field, iter->ent);
797 if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
800 return TRACE_TYPE_PARTIAL_LINE;
802 return TRACE_TYPE_HANDLED;
805 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags)
807 struct ftrace_entry *field;
808 struct trace_seq *s = &iter->seq;
810 trace_assign_type(field, iter->ent);
812 SEQ_PUT_HEX_FIELD_RET(s, field->ip);
813 SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
815 return TRACE_TYPE_HANDLED;
818 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags)
820 struct ftrace_entry *field;
821 struct trace_seq *s = &iter->seq;
823 trace_assign_type(field, iter->ent);
825 SEQ_PUT_FIELD_RET(s, field->ip);
826 SEQ_PUT_FIELD_RET(s, field->parent_ip);
828 return TRACE_TYPE_HANDLED;
831 static struct trace_event trace_fn_event = {
833 .trace = trace_fn_trace,
836 .binary = trace_fn_bin,
839 /* TRACE_CTX an TRACE_WAKE */
840 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
843 struct ctx_switch_entry *field;
844 char comm[TASK_COMM_LEN];
848 trace_assign_type(field, iter->ent);
850 T = task_state_char(field->next_state);
851 S = task_state_char(field->prev_state);
852 trace_find_cmdline(field->next_pid, comm);
853 if (!trace_seq_printf(&iter->seq,
854 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
862 return TRACE_TYPE_PARTIAL_LINE;
864 return TRACE_TYPE_HANDLED;
867 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags)
869 return trace_ctxwake_print(iter, "==>");
872 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
875 return trace_ctxwake_print(iter, " +");
878 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
880 struct ctx_switch_entry *field;
883 trace_assign_type(field, iter->ent);
886 S = task_state_char(field->prev_state);
887 T = task_state_char(field->next_state);
888 if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
896 return TRACE_TYPE_PARTIAL_LINE;
898 return TRACE_TYPE_HANDLED;
901 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags)
903 return trace_ctxwake_raw(iter, 0);
906 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags)
908 return trace_ctxwake_raw(iter, '+');
912 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
914 struct ctx_switch_entry *field;
915 struct trace_seq *s = &iter->seq;
918 trace_assign_type(field, iter->ent);
921 S = task_state_char(field->prev_state);
922 T = task_state_char(field->next_state);
924 SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
925 SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
926 SEQ_PUT_HEX_FIELD_RET(s, S);
927 SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
928 SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
929 SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
930 SEQ_PUT_HEX_FIELD_RET(s, T);
932 return TRACE_TYPE_HANDLED;
935 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags)
937 return trace_ctxwake_hex(iter, 0);
940 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags)
942 return trace_ctxwake_hex(iter, '+');
945 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
948 struct ctx_switch_entry *field;
949 struct trace_seq *s = &iter->seq;
951 trace_assign_type(field, iter->ent);
953 SEQ_PUT_FIELD_RET(s, field->prev_pid);
954 SEQ_PUT_FIELD_RET(s, field->prev_prio);
955 SEQ_PUT_FIELD_RET(s, field->prev_state);
956 SEQ_PUT_FIELD_RET(s, field->next_pid);
957 SEQ_PUT_FIELD_RET(s, field->next_prio);
958 SEQ_PUT_FIELD_RET(s, field->next_state);
960 return TRACE_TYPE_HANDLED;
963 static struct trace_event trace_ctx_event = {
965 .trace = trace_ctx_print,
966 .raw = trace_ctx_raw,
967 .hex = trace_ctx_hex,
968 .binary = trace_ctxwake_bin,
971 static struct trace_event trace_wake_event = {
973 .trace = trace_wake_print,
974 .raw = trace_wake_raw,
975 .hex = trace_wake_hex,
976 .binary = trace_ctxwake_bin,
980 static enum print_line_t trace_special_print(struct trace_iterator *iter,
983 struct special_entry *field;
985 trace_assign_type(field, iter->ent);
987 if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
991 return TRACE_TYPE_PARTIAL_LINE;
993 return TRACE_TYPE_HANDLED;
996 static enum print_line_t trace_special_hex(struct trace_iterator *iter,
999 struct special_entry *field;
1000 struct trace_seq *s = &iter->seq;
1002 trace_assign_type(field, iter->ent);
1004 SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
1005 SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
1006 SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
1008 return TRACE_TYPE_HANDLED;
1011 static enum print_line_t trace_special_bin(struct trace_iterator *iter,
1014 struct special_entry *field;
1015 struct trace_seq *s = &iter->seq;
1017 trace_assign_type(field, iter->ent);
1019 SEQ_PUT_FIELD_RET(s, field->arg1);
1020 SEQ_PUT_FIELD_RET(s, field->arg2);
1021 SEQ_PUT_FIELD_RET(s, field->arg3);
1023 return TRACE_TYPE_HANDLED;
1026 static struct trace_event trace_special_event = {
1027 .type = TRACE_SPECIAL,
1028 .trace = trace_special_print,
1029 .raw = trace_special_print,
1030 .hex = trace_special_hex,
1031 .binary = trace_special_bin,
1036 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1039 struct stack_entry *field;
1040 struct trace_seq *s = &iter->seq;
1043 trace_assign_type(field, iter->ent);
1045 if (!trace_seq_puts(s, "<stack trace>\n"))
1047 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1048 if (!field->caller[i] || (field->caller[i] == ULONG_MAX))
1050 if (!trace_seq_puts(s, " => "))
1053 if (!seq_print_ip_sym(s, field->caller[i], flags))
1055 if (!trace_seq_puts(s, "\n"))
1059 return TRACE_TYPE_HANDLED;
1062 return TRACE_TYPE_PARTIAL_LINE;
1065 static struct trace_event trace_stack_event = {
1066 .type = TRACE_STACK,
1067 .trace = trace_stack_print,
1068 .raw = trace_special_print,
1069 .hex = trace_special_hex,
1070 .binary = trace_special_bin,
1073 /* TRACE_USER_STACK */
1074 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1077 struct userstack_entry *field;
1078 struct trace_seq *s = &iter->seq;
1080 trace_assign_type(field, iter->ent);
1082 if (!trace_seq_puts(s, "<user stack trace>\n"))
1085 if (!seq_print_userip_objs(field, s, flags))
1088 return TRACE_TYPE_HANDLED;
1091 return TRACE_TYPE_PARTIAL_LINE;
1094 static struct trace_event trace_user_stack_event = {
1095 .type = TRACE_USER_STACK,
1096 .trace = trace_user_stack_print,
1097 .raw = trace_special_print,
1098 .hex = trace_special_hex,
1099 .binary = trace_special_bin,
1103 static enum print_line_t
1104 trace_bprint_print(struct trace_iterator *iter, int flags)
1106 struct trace_entry *entry = iter->ent;
1107 struct trace_seq *s = &iter->seq;
1108 struct bprint_entry *field;
1110 trace_assign_type(field, entry);
1112 if (!seq_print_ip_sym(s, field->ip, flags))
1115 if (!trace_seq_puts(s, ": "))
1118 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1121 return TRACE_TYPE_HANDLED;
1124 return TRACE_TYPE_PARTIAL_LINE;
1128 static enum print_line_t
1129 trace_bprint_raw(struct trace_iterator *iter, int flags)
1131 struct bprint_entry *field;
1132 struct trace_seq *s = &iter->seq;
1134 trace_assign_type(field, iter->ent);
1136 if (!trace_seq_printf(s, ": %lx : ", field->ip))
1139 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1142 return TRACE_TYPE_HANDLED;
1145 return TRACE_TYPE_PARTIAL_LINE;
1149 static struct trace_event trace_bprint_event = {
1150 .type = TRACE_BPRINT,
1151 .trace = trace_bprint_print,
1152 .raw = trace_bprint_raw,
1156 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1159 struct print_entry *field;
1160 struct trace_seq *s = &iter->seq;
1162 trace_assign_type(field, iter->ent);
1164 if (!seq_print_ip_sym(s, field->ip, flags))
1167 if (!trace_seq_printf(s, ": %s", field->buf))
1170 return TRACE_TYPE_HANDLED;
1173 return TRACE_TYPE_PARTIAL_LINE;
1176 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
1178 struct print_entry *field;
1180 trace_assign_type(field, iter->ent);
1182 if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1185 return TRACE_TYPE_HANDLED;
1188 return TRACE_TYPE_PARTIAL_LINE;
1191 static struct trace_event trace_print_event = {
1192 .type = TRACE_PRINT,
1193 .trace = trace_print_print,
1194 .raw = trace_print_raw,
1198 static struct trace_event *events[] __initdata = {
1202 &trace_special_event,
1204 &trace_user_stack_event,
1205 &trace_bprint_event,
1210 __init static int init_events(void)
1212 struct trace_event *event;
1215 for (i = 0; events[i]; i++) {
1218 ret = register_ftrace_event(event);
1220 printk(KERN_WARNING "event %d failed to register\n",
1228 device_initcall(init_events);