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 int trace_print_seq(struct seq_file *m, struct trace_seq *s)
28 int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;
31 ret = seq_write(m, s->buffer, len);
34 * Only reset this buffer if we successfully wrote to the
43 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
45 struct trace_seq *s = &iter->seq;
46 struct trace_entry *entry = iter->ent;
47 struct bprint_entry *field;
50 trace_assign_type(field, entry);
52 ret = trace_seq_bprintf(s, field->fmt, field->buf);
54 return TRACE_TYPE_PARTIAL_LINE;
56 return TRACE_TYPE_HANDLED;
59 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
61 struct trace_seq *s = &iter->seq;
62 struct trace_entry *entry = iter->ent;
63 struct print_entry *field;
66 trace_assign_type(field, entry);
68 ret = trace_seq_printf(s, "%s", field->buf);
70 return TRACE_TYPE_PARTIAL_LINE;
72 return TRACE_TYPE_HANDLED;
76 * trace_seq_printf - sequence printing of trace information
77 * @s: trace sequence descriptor
78 * @fmt: printf format string
80 * It returns 0 if the trace oversizes the buffer's free
83 * The tracer may use either sequence operations or its own
84 * copy to user routines. To simplify formating of a trace
85 * trace_seq_printf is used to store strings into a special
86 * buffer (@s). Then the output may be either used by
87 * the sequencer or pulled into another buffer.
90 trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
92 int len = (PAGE_SIZE - 1) - s->len;
100 ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
103 /* If we can't write it all, don't bother writing anything */
113 EXPORT_SYMBOL_GPL(trace_seq_printf);
116 * trace_seq_vprintf - sequence printing of trace information
117 * @s: trace sequence descriptor
118 * @fmt: printf format string
120 * The tracer may use either sequence operations or its own
121 * copy to user routines. To simplify formating of a trace
122 * trace_seq_printf is used to store strings into a special
123 * buffer (@s). Then the output may be either used by
124 * the sequencer or pulled into another buffer.
127 trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
129 int len = (PAGE_SIZE - 1) - s->len;
135 ret = vsnprintf(s->buffer + s->len, len, fmt, args);
137 /* If we can't write it all, don't bother writing anything */
147 EXPORT_SYMBOL_GPL(trace_seq_vprintf);
149 int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
151 int len = (PAGE_SIZE - 1) - s->len;
157 ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
159 /* If we can't write it all, don't bother writing anything */
171 * trace_seq_puts - trace sequence printing of simple string
172 * @s: trace sequence descriptor
173 * @str: simple string to record
175 * The tracer may use either the sequence operations or its own
176 * copy to user routines. This function records a simple string
177 * into a special buffer (@s) for later retrieval by a sequencer
178 * or other mechanism.
180 int trace_seq_puts(struct trace_seq *s, const char *str)
182 int len = strlen(str);
187 if (len > ((PAGE_SIZE - 1) - s->len)) {
192 memcpy(s->buffer + s->len, str, len);
198 int trace_seq_putc(struct trace_seq *s, unsigned char c)
203 if (s->len >= (PAGE_SIZE - 1)) {
208 s->buffer[s->len++] = c;
212 EXPORT_SYMBOL(trace_seq_putc);
214 int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
219 if (len > ((PAGE_SIZE - 1) - s->len)) {
224 memcpy(s->buffer + s->len, mem, len);
230 int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
232 unsigned char hex[HEX_CHARS];
233 const unsigned char *data = mem;
240 for (i = 0, j = 0; i < len; i++) {
242 for (i = len-1, j = 0; i >= 0; i--) {
244 hex[j++] = hex_asc_hi(data[i]);
245 hex[j++] = hex_asc_lo(data[i]);
249 return trace_seq_putmem(s, hex, j);
252 void *trace_seq_reserve(struct trace_seq *s, size_t len)
259 if (len > ((PAGE_SIZE - 1) - s->len)) {
264 ret = s->buffer + s->len;
270 int trace_seq_path(struct trace_seq *s, struct path *path)
277 if (s->len >= (PAGE_SIZE - 1)) {
282 p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
284 p = mangle_path(s->buffer + s->len, p, "\n");
286 s->len = p - s->buffer;
290 s->buffer[s->len++] = '?';
299 ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
301 const struct trace_print_flags *flag_array)
305 const char *ret = p->buffer + p->len;
308 for (i = 0; flag_array[i].name && flags; i++) {
310 mask = flag_array[i].mask;
311 if ((flags & mask) != mask)
314 str = flag_array[i].name;
317 trace_seq_puts(p, delim);
318 trace_seq_puts(p, str);
321 /* check for left over flags */
324 trace_seq_puts(p, delim);
325 trace_seq_printf(p, "0x%lx", flags);
328 trace_seq_putc(p, 0);
332 EXPORT_SYMBOL(ftrace_print_flags_seq);
335 ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
336 const struct trace_print_flags *symbol_array)
339 const char *ret = p->buffer + p->len;
341 for (i = 0; symbol_array[i].name; i++) {
343 if (val != symbol_array[i].mask)
346 trace_seq_puts(p, symbol_array[i].name);
351 trace_seq_printf(p, "0x%lx", val);
353 trace_seq_putc(p, 0);
357 EXPORT_SYMBOL(ftrace_print_symbols_seq);
360 ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
363 const char *ret = p->buffer + p->len;
365 for (i = 0; i < buf_len; i++)
366 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
368 trace_seq_putc(p, 0);
372 EXPORT_SYMBOL(ftrace_print_hex_seq);
374 #ifdef CONFIG_KRETPROBES
375 static inline const char *kretprobed(const char *name)
377 static const char tramp_name[] = "kretprobe_trampoline";
378 int size = sizeof(tramp_name);
380 if (strncmp(tramp_name, name, size) == 0)
381 return "[unknown/kretprobe'd]";
385 static inline const char *kretprobed(const char *name)
389 #endif /* CONFIG_KRETPROBES */
392 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
394 #ifdef CONFIG_KALLSYMS
395 char str[KSYM_SYMBOL_LEN];
398 kallsyms_lookup(address, NULL, NULL, NULL, str);
400 name = kretprobed(str);
402 return trace_seq_printf(s, fmt, name);
408 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
409 unsigned long address)
411 #ifdef CONFIG_KALLSYMS
412 char str[KSYM_SYMBOL_LEN];
415 sprint_symbol(str, address);
416 name = kretprobed(str);
418 return trace_seq_printf(s, fmt, name);
424 # define IP_FMT "%08lx"
426 # define IP_FMT "%016lx"
429 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
430 unsigned long ip, unsigned long sym_flags)
432 struct file *file = NULL;
433 unsigned long vmstart = 0;
440 const struct vm_area_struct *vma;
442 down_read(&mm->mmap_sem);
443 vma = find_vma(mm, ip);
446 vmstart = vma->vm_start;
449 ret = trace_seq_path(s, &file->f_path);
451 ret = trace_seq_printf(s, "[+0x%lx]",
454 up_read(&mm->mmap_sem);
456 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
457 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
462 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
463 unsigned long sym_flags)
465 struct mm_struct *mm = NULL;
469 if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
470 struct task_struct *task;
472 * we do the lookup on the thread group leader,
473 * since individual threads might have already quit!
476 task = find_task_by_vpid(entry->tgid);
478 mm = get_task_mm(task);
482 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
483 unsigned long ip = entry->caller[i];
485 if (ip == ULONG_MAX || !ret)
488 ret = trace_seq_puts(s, " => ");
491 ret = trace_seq_puts(s, "??");
493 ret = trace_seq_puts(s, "\n");
499 ret = seq_print_user_ip(s, mm, ip, sym_flags);
500 ret = trace_seq_puts(s, "\n");
509 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
514 return trace_seq_printf(s, "0");
516 if (sym_flags & TRACE_ITER_SYM_OFFSET)
517 ret = seq_print_sym_offset(s, "%s", ip);
519 ret = seq_print_sym_short(s, "%s", ip);
524 if (sym_flags & TRACE_ITER_SYM_ADDR)
525 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
530 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
531 * @s: trace seq struct to write to
532 * @entry: The trace entry field from the ring buffer
534 * Prints the generic fields of irqs off, in hard or softirq, preempt
535 * count and lock depth.
537 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
539 int hardirq, softirq;
542 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
543 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
545 if (!trace_seq_printf(s, "%c%c%c",
546 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
547 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
549 (entry->flags & TRACE_FLAG_NEED_RESCHED) ?
551 (hardirq && softirq) ? 'H' :
552 hardirq ? 'h' : softirq ? 's' : '.'))
555 if (entry->preempt_count)
556 ret = trace_seq_printf(s, "%x", entry->preempt_count);
558 ret = trace_seq_putc(s, '.');
563 if (entry->lock_depth < 0)
564 return trace_seq_putc(s, '.');
566 return trace_seq_printf(s, "%d", entry->lock_depth);
570 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
572 char comm[TASK_COMM_LEN];
574 trace_find_cmdline(entry->pid, comm);
576 if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
577 comm, entry->pid, cpu))
580 return trace_print_lat_fmt(s, entry);
583 static unsigned long preempt_mark_thresh = 100;
586 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
587 unsigned long rel_usecs)
589 return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
590 rel_usecs > preempt_mark_thresh ? '!' :
591 rel_usecs > 1 ? '+' : ' ');
594 int trace_print_context(struct trace_iterator *iter)
596 struct trace_seq *s = &iter->seq;
597 struct trace_entry *entry = iter->ent;
598 unsigned long long t = ns2usecs(iter->ts);
599 unsigned long usec_rem = do_div(t, USEC_PER_SEC);
600 unsigned long secs = (unsigned long)t;
601 char comm[TASK_COMM_LEN];
603 trace_find_cmdline(entry->pid, comm);
605 return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
606 comm, entry->pid, iter->cpu, secs, usec_rem);
609 int trace_print_lat_context(struct trace_iterator *iter)
613 struct trace_seq *s = &iter->seq;
614 struct trace_entry *entry = iter->ent,
615 *next_entry = trace_find_next_entry(iter, NULL,
617 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
618 unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
619 unsigned long rel_usecs;
623 rel_usecs = ns2usecs(next_ts - iter->ts);
626 char comm[TASK_COMM_LEN];
628 trace_find_cmdline(entry->pid, comm);
630 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
631 " %ld.%03ldms (+%ld.%03ldms): ", comm,
632 entry->pid, iter->cpu, entry->flags,
633 entry->preempt_count, iter->idx,
635 abs_usecs / USEC_PER_MSEC,
636 abs_usecs % USEC_PER_MSEC,
637 rel_usecs / USEC_PER_MSEC,
638 rel_usecs % USEC_PER_MSEC);
640 ret = lat_print_generic(s, entry, iter->cpu);
642 ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
648 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
650 static int task_state_char(unsigned long state)
652 int bit = state ? __ffs(state) + 1 : 0;
654 return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
658 * ftrace_find_event - find a registered event
659 * @type: the type of event to look for
661 * Returns an event of type @type otherwise NULL
662 * Called with trace_event_read_lock() held.
664 struct trace_event *ftrace_find_event(int type)
666 struct trace_event *event;
667 struct hlist_node *n;
670 key = type & (EVENT_HASHSIZE - 1);
672 hlist_for_each_entry(event, n, &event_hash[key], node) {
673 if (event->type == type)
680 static LIST_HEAD(ftrace_event_list);
682 static int trace_search_list(struct list_head **list)
684 struct trace_event *e;
685 int last = __TRACE_LAST_TYPE;
687 if (list_empty(&ftrace_event_list)) {
688 *list = &ftrace_event_list;
693 * We used up all possible max events,
694 * lets see if somebody freed one.
696 list_for_each_entry(e, &ftrace_event_list, list) {
697 if (e->type != last + 1)
702 /* Did we used up all 65 thousand events??? */
703 if ((last + 1) > FTRACE_MAX_EVENT)
710 void trace_event_read_lock(void)
712 down_read(&trace_event_mutex);
715 void trace_event_read_unlock(void)
717 up_read(&trace_event_mutex);
721 * register_ftrace_event - register output for an event type
722 * @event: the event type to register
724 * Event types are stored in a hash and this hash is used to
725 * find a way to print an event. If the @event->type is set
726 * then it will use that type, otherwise it will assign a
729 * If you assign your own type, please make sure it is added
730 * to the trace_type enum in trace.h, to avoid collisions
731 * with the dynamic types.
733 * Returns the event type number or zero on error.
735 int register_ftrace_event(struct trace_event *event)
740 down_write(&trace_event_mutex);
745 if (WARN_ON(!event->funcs))
748 INIT_LIST_HEAD(&event->list);
751 struct list_head *list = NULL;
753 if (next_event_type > FTRACE_MAX_EVENT) {
755 event->type = trace_search_list(&list);
761 event->type = next_event_type++;
762 list = &ftrace_event_list;
765 if (WARN_ON(ftrace_find_event(event->type)))
768 list_add_tail(&event->list, list);
770 } else if (event->type > __TRACE_LAST_TYPE) {
771 printk(KERN_WARNING "Need to add type to trace.h\n");
775 /* Is this event already used */
776 if (ftrace_find_event(event->type))
780 if (event->funcs->trace == NULL)
781 event->funcs->trace = trace_nop_print;
782 if (event->funcs->raw == NULL)
783 event->funcs->raw = trace_nop_print;
784 if (event->funcs->hex == NULL)
785 event->funcs->hex = trace_nop_print;
786 if (event->funcs->binary == NULL)
787 event->funcs->binary = trace_nop_print;
789 key = event->type & (EVENT_HASHSIZE - 1);
791 hlist_add_head(&event->node, &event_hash[key]);
795 up_write(&trace_event_mutex);
799 EXPORT_SYMBOL_GPL(register_ftrace_event);
802 * Used by module code with the trace_event_mutex held for write.
804 int __unregister_ftrace_event(struct trace_event *event)
806 hlist_del(&event->node);
807 list_del(&event->list);
812 * unregister_ftrace_event - remove a no longer used event
813 * @event: the event to remove
815 int unregister_ftrace_event(struct trace_event *event)
817 down_write(&trace_event_mutex);
818 __unregister_ftrace_event(event);
819 up_write(&trace_event_mutex);
823 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
829 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
830 struct trace_event *event)
832 return TRACE_TYPE_HANDLED;
836 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
837 struct trace_event *event)
839 struct ftrace_entry *field;
840 struct trace_seq *s = &iter->seq;
842 trace_assign_type(field, iter->ent);
844 if (!seq_print_ip_sym(s, field->ip, flags))
847 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
848 if (!trace_seq_printf(s, " <-"))
850 if (!seq_print_ip_sym(s,
855 if (!trace_seq_printf(s, "\n"))
858 return TRACE_TYPE_HANDLED;
861 return TRACE_TYPE_PARTIAL_LINE;
864 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
865 struct trace_event *event)
867 struct ftrace_entry *field;
869 trace_assign_type(field, iter->ent);
871 if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
874 return TRACE_TYPE_PARTIAL_LINE;
876 return TRACE_TYPE_HANDLED;
879 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
880 struct trace_event *event)
882 struct ftrace_entry *field;
883 struct trace_seq *s = &iter->seq;
885 trace_assign_type(field, iter->ent);
887 SEQ_PUT_HEX_FIELD_RET(s, field->ip);
888 SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
890 return TRACE_TYPE_HANDLED;
893 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
894 struct trace_event *event)
896 struct ftrace_entry *field;
897 struct trace_seq *s = &iter->seq;
899 trace_assign_type(field, iter->ent);
901 SEQ_PUT_FIELD_RET(s, field->ip);
902 SEQ_PUT_FIELD_RET(s, field->parent_ip);
904 return TRACE_TYPE_HANDLED;
907 static struct trace_event_functions trace_fn_funcs = {
908 .trace = trace_fn_trace,
911 .binary = trace_fn_bin,
914 static struct trace_event trace_fn_event = {
916 .funcs = &trace_fn_funcs,
919 /* TRACE_CTX an TRACE_WAKE */
920 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
923 struct ctx_switch_entry *field;
924 char comm[TASK_COMM_LEN];
928 trace_assign_type(field, iter->ent);
930 T = task_state_char(field->next_state);
931 S = task_state_char(field->prev_state);
932 trace_find_cmdline(field->next_pid, comm);
933 if (!trace_seq_printf(&iter->seq,
934 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
942 return TRACE_TYPE_PARTIAL_LINE;
944 return TRACE_TYPE_HANDLED;
947 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
948 struct trace_event *event)
950 return trace_ctxwake_print(iter, "==>");
953 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
954 int flags, struct trace_event *event)
956 return trace_ctxwake_print(iter, " +");
959 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
961 struct ctx_switch_entry *field;
964 trace_assign_type(field, iter->ent);
967 S = task_state_char(field->prev_state);
968 T = task_state_char(field->next_state);
969 if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
977 return TRACE_TYPE_PARTIAL_LINE;
979 return TRACE_TYPE_HANDLED;
982 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
983 struct trace_event *event)
985 return trace_ctxwake_raw(iter, 0);
988 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
989 struct trace_event *event)
991 return trace_ctxwake_raw(iter, '+');
995 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
997 struct ctx_switch_entry *field;
998 struct trace_seq *s = &iter->seq;
1001 trace_assign_type(field, iter->ent);
1004 S = task_state_char(field->prev_state);
1005 T = task_state_char(field->next_state);
1007 SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
1008 SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
1009 SEQ_PUT_HEX_FIELD_RET(s, S);
1010 SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
1011 SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
1012 SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
1013 SEQ_PUT_HEX_FIELD_RET(s, T);
1015 return TRACE_TYPE_HANDLED;
1018 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1019 struct trace_event *event)
1021 return trace_ctxwake_hex(iter, 0);
1024 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1025 struct trace_event *event)
1027 return trace_ctxwake_hex(iter, '+');
1030 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1031 int flags, struct trace_event *event)
1033 struct ctx_switch_entry *field;
1034 struct trace_seq *s = &iter->seq;
1036 trace_assign_type(field, iter->ent);
1038 SEQ_PUT_FIELD_RET(s, field->prev_pid);
1039 SEQ_PUT_FIELD_RET(s, field->prev_prio);
1040 SEQ_PUT_FIELD_RET(s, field->prev_state);
1041 SEQ_PUT_FIELD_RET(s, field->next_pid);
1042 SEQ_PUT_FIELD_RET(s, field->next_prio);
1043 SEQ_PUT_FIELD_RET(s, field->next_state);
1045 return TRACE_TYPE_HANDLED;
1048 static struct trace_event_functions trace_ctx_funcs = {
1049 .trace = trace_ctx_print,
1050 .raw = trace_ctx_raw,
1051 .hex = trace_ctx_hex,
1052 .binary = trace_ctxwake_bin,
1055 static struct trace_event trace_ctx_event = {
1057 .funcs = &trace_ctx_funcs,
1060 static struct trace_event_functions trace_wake_funcs = {
1061 .trace = trace_wake_print,
1062 .raw = trace_wake_raw,
1063 .hex = trace_wake_hex,
1064 .binary = trace_ctxwake_bin,
1067 static struct trace_event trace_wake_event = {
1069 .funcs = &trace_wake_funcs,
1073 static enum print_line_t trace_special_print(struct trace_iterator *iter,
1074 int flags, struct trace_event *event)
1076 struct special_entry *field;
1078 trace_assign_type(field, iter->ent);
1080 if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
1084 return TRACE_TYPE_PARTIAL_LINE;
1086 return TRACE_TYPE_HANDLED;
1089 static enum print_line_t trace_special_hex(struct trace_iterator *iter,
1090 int flags, struct trace_event *event)
1092 struct special_entry *field;
1093 struct trace_seq *s = &iter->seq;
1095 trace_assign_type(field, iter->ent);
1097 SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
1098 SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
1099 SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
1101 return TRACE_TYPE_HANDLED;
1104 static enum print_line_t trace_special_bin(struct trace_iterator *iter,
1105 int flags, struct trace_event *event)
1107 struct special_entry *field;
1108 struct trace_seq *s = &iter->seq;
1110 trace_assign_type(field, iter->ent);
1112 SEQ_PUT_FIELD_RET(s, field->arg1);
1113 SEQ_PUT_FIELD_RET(s, field->arg2);
1114 SEQ_PUT_FIELD_RET(s, field->arg3);
1116 return TRACE_TYPE_HANDLED;
1119 static struct trace_event_functions trace_special_funcs = {
1120 .trace = trace_special_print,
1121 .raw = trace_special_print,
1122 .hex = trace_special_hex,
1123 .binary = trace_special_bin,
1126 static struct trace_event trace_special_event = {
1127 .type = TRACE_SPECIAL,
1128 .funcs = &trace_special_funcs,
1133 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1134 int flags, struct trace_event *event)
1136 struct stack_entry *field;
1137 struct trace_seq *s = &iter->seq;
1140 trace_assign_type(field, iter->ent);
1142 if (!trace_seq_puts(s, "<stack trace>\n"))
1144 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1145 if (!field->caller[i] || (field->caller[i] == ULONG_MAX))
1147 if (!trace_seq_puts(s, " => "))
1150 if (!seq_print_ip_sym(s, field->caller[i], flags))
1152 if (!trace_seq_puts(s, "\n"))
1156 return TRACE_TYPE_HANDLED;
1159 return TRACE_TYPE_PARTIAL_LINE;
1162 static struct trace_event_functions trace_stack_funcs = {
1163 .trace = trace_stack_print,
1164 .raw = trace_special_print,
1165 .hex = trace_special_hex,
1166 .binary = trace_special_bin,
1169 static struct trace_event trace_stack_event = {
1170 .type = TRACE_STACK,
1171 .funcs = &trace_stack_funcs,
1174 /* TRACE_USER_STACK */
1175 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1176 int flags, struct trace_event *event)
1178 struct userstack_entry *field;
1179 struct trace_seq *s = &iter->seq;
1181 trace_assign_type(field, iter->ent);
1183 if (!trace_seq_puts(s, "<user stack trace>\n"))
1186 if (!seq_print_userip_objs(field, s, flags))
1189 return TRACE_TYPE_HANDLED;
1192 return TRACE_TYPE_PARTIAL_LINE;
1195 static struct trace_event_functions trace_user_stack_funcs = {
1196 .trace = trace_user_stack_print,
1197 .raw = trace_special_print,
1198 .hex = trace_special_hex,
1199 .binary = trace_special_bin,
1202 static struct trace_event trace_user_stack_event = {
1203 .type = TRACE_USER_STACK,
1204 .funcs = &trace_user_stack_funcs,
1208 static enum print_line_t
1209 trace_bprint_print(struct trace_iterator *iter, int flags,
1210 struct trace_event *event)
1212 struct trace_entry *entry = iter->ent;
1213 struct trace_seq *s = &iter->seq;
1214 struct bprint_entry *field;
1216 trace_assign_type(field, entry);
1218 if (!seq_print_ip_sym(s, field->ip, flags))
1221 if (!trace_seq_puts(s, ": "))
1224 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1227 return TRACE_TYPE_HANDLED;
1230 return TRACE_TYPE_PARTIAL_LINE;
1234 static enum print_line_t
1235 trace_bprint_raw(struct trace_iterator *iter, int flags,
1236 struct trace_event *event)
1238 struct bprint_entry *field;
1239 struct trace_seq *s = &iter->seq;
1241 trace_assign_type(field, iter->ent);
1243 if (!trace_seq_printf(s, ": %lx : ", field->ip))
1246 if (!trace_seq_bprintf(s, field->fmt, field->buf))
1249 return TRACE_TYPE_HANDLED;
1252 return TRACE_TYPE_PARTIAL_LINE;
1255 static struct trace_event_functions trace_bprint_funcs = {
1256 .trace = trace_bprint_print,
1257 .raw = trace_bprint_raw,
1260 static struct trace_event trace_bprint_event = {
1261 .type = TRACE_BPRINT,
1262 .funcs = &trace_bprint_funcs,
1266 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1267 int flags, struct trace_event *event)
1269 struct print_entry *field;
1270 struct trace_seq *s = &iter->seq;
1272 trace_assign_type(field, iter->ent);
1274 if (!seq_print_ip_sym(s, field->ip, flags))
1277 if (!trace_seq_printf(s, ": %s", field->buf))
1280 return TRACE_TYPE_HANDLED;
1283 return TRACE_TYPE_PARTIAL_LINE;
1286 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1287 struct trace_event *event)
1289 struct print_entry *field;
1291 trace_assign_type(field, iter->ent);
1293 if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1296 return TRACE_TYPE_HANDLED;
1299 return TRACE_TYPE_PARTIAL_LINE;
1302 static struct trace_event_functions trace_print_funcs = {
1303 .trace = trace_print_print,
1304 .raw = trace_print_raw,
1307 static struct trace_event trace_print_event = {
1308 .type = TRACE_PRINT,
1309 .funcs = &trace_print_funcs,
1313 static struct trace_event *events[] __initdata = {
1317 &trace_special_event,
1319 &trace_user_stack_event,
1320 &trace_bprint_event,
1325 __init static int init_events(void)
1327 struct trace_event *event;
1330 for (i = 0; events[i]; i++) {
1333 ret = register_ftrace_event(event);
1335 printk(KERN_WARNING "event %d failed to register\n",
1343 device_initcall(init_events);