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_sem);
19 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
21 static int next_event_type = __TRACE_LAST_TYPE + 1;
23 enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
25 struct trace_seq *s = &iter->seq;
26 struct trace_entry *entry = iter->ent;
27 struct bputs_entry *field;
29 trace_assign_type(field, entry);
31 trace_seq_puts(s, field->str);
33 return trace_handle_return(s);
36 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
38 struct trace_seq *s = &iter->seq;
39 struct trace_entry *entry = iter->ent;
40 struct bprint_entry *field;
42 trace_assign_type(field, entry);
44 trace_seq_bprintf(s, field->fmt, field->buf);
46 return trace_handle_return(s);
49 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
51 struct trace_seq *s = &iter->seq;
52 struct trace_entry *entry = iter->ent;
53 struct print_entry *field;
55 trace_assign_type(field, entry);
57 trace_seq_puts(s, field->buf);
59 return trace_handle_return(s);
63 trace_print_flags_seq(struct trace_seq *p, const char *delim,
65 const struct trace_print_flags *flag_array)
69 const char *ret = trace_seq_buffer_ptr(p);
72 for (i = 0; flag_array[i].name && flags; i++) {
74 mask = flag_array[i].mask;
75 if ((flags & mask) != mask)
78 str = flag_array[i].name;
81 trace_seq_puts(p, delim);
84 trace_seq_puts(p, str);
87 /* check for left over flags */
90 trace_seq_puts(p, delim);
91 trace_seq_printf(p, "0x%lx", flags);
98 EXPORT_SYMBOL(trace_print_flags_seq);
101 trace_print_symbols_seq(struct trace_seq *p, unsigned long val,
102 const struct trace_print_flags *symbol_array)
105 const char *ret = trace_seq_buffer_ptr(p);
107 for (i = 0; symbol_array[i].name; i++) {
109 if (val != symbol_array[i].mask)
112 trace_seq_puts(p, symbol_array[i].name);
116 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
117 trace_seq_printf(p, "0x%lx", val);
119 trace_seq_putc(p, 0);
123 EXPORT_SYMBOL(trace_print_symbols_seq);
125 #if BITS_PER_LONG == 32
127 trace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
128 const struct trace_print_flags_u64 *symbol_array)
131 const char *ret = trace_seq_buffer_ptr(p);
133 for (i = 0; symbol_array[i].name; i++) {
135 if (val != symbol_array[i].mask)
138 trace_seq_puts(p, symbol_array[i].name);
142 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
143 trace_seq_printf(p, "0x%llx", val);
145 trace_seq_putc(p, 0);
149 EXPORT_SYMBOL(trace_print_symbols_seq_u64);
153 trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
154 unsigned int bitmask_size)
156 const char *ret = trace_seq_buffer_ptr(p);
158 trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8);
159 trace_seq_putc(p, 0);
163 EXPORT_SYMBOL_GPL(trace_print_bitmask_seq);
166 trace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
169 const char *ret = trace_seq_buffer_ptr(p);
171 for (i = 0; i < buf_len; i++)
172 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
174 trace_seq_putc(p, 0);
178 EXPORT_SYMBOL(trace_print_hex_seq);
181 trace_print_array_seq(struct trace_seq *p, const void *buf, int count,
184 const char *ret = trace_seq_buffer_ptr(p);
185 const char *prefix = "";
186 void *ptr = (void *)buf;
187 size_t buf_len = count * el_size;
189 trace_seq_putc(p, '{');
191 while (ptr < buf + buf_len) {
194 trace_seq_printf(p, "%s0x%x", prefix,
198 trace_seq_printf(p, "%s0x%x", prefix,
202 trace_seq_printf(p, "%s0x%x", prefix,
206 trace_seq_printf(p, "%s0x%llx", prefix,
210 trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
218 trace_seq_putc(p, '}');
219 trace_seq_putc(p, 0);
223 EXPORT_SYMBOL(trace_print_array_seq);
225 int trace_raw_output_prep(struct trace_iterator *iter,
226 struct trace_event *trace_event)
228 struct trace_event_call *event;
229 struct trace_seq *s = &iter->seq;
230 struct trace_seq *p = &iter->tmp_seq;
231 struct trace_entry *entry;
233 event = container_of(trace_event, struct trace_event_call, event);
236 if (entry->type != event->event.type) {
238 return TRACE_TYPE_UNHANDLED;
242 trace_seq_printf(s, "%s: ", trace_event_name(event));
244 return trace_handle_return(s);
246 EXPORT_SYMBOL(trace_raw_output_prep);
248 static int trace_output_raw(struct trace_iterator *iter, char *name,
249 char *fmt, va_list ap)
251 struct trace_seq *s = &iter->seq;
253 trace_seq_printf(s, "%s: ", name);
254 trace_seq_vprintf(s, fmt, ap);
256 return trace_handle_return(s);
259 int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
265 ret = trace_output_raw(iter, name, fmt, ap);
270 EXPORT_SYMBOL_GPL(trace_output_call);
272 #ifdef CONFIG_KRETPROBES
273 static inline const char *kretprobed(const char *name)
275 static const char tramp_name[] = "kretprobe_trampoline";
276 int size = sizeof(tramp_name);
278 if (strncmp(tramp_name, name, size) == 0)
279 return "[unknown/kretprobe'd]";
283 static inline const char *kretprobed(const char *name)
287 #endif /* CONFIG_KRETPROBES */
290 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
292 #ifdef CONFIG_KALLSYMS
293 char str[KSYM_SYMBOL_LEN];
296 kallsyms_lookup(address, NULL, NULL, NULL, str);
298 name = kretprobed(str);
300 trace_seq_printf(s, fmt, name);
305 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
306 unsigned long address)
308 #ifdef CONFIG_KALLSYMS
309 char str[KSYM_SYMBOL_LEN];
312 sprint_symbol(str, address);
313 name = kretprobed(str);
315 trace_seq_printf(s, fmt, name);
320 # define IP_FMT "%08lx"
322 # define IP_FMT "%016lx"
325 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
326 unsigned long ip, unsigned long sym_flags)
328 struct file *file = NULL;
329 unsigned long vmstart = 0;
336 const struct vm_area_struct *vma;
338 down_read(&mm->mmap_sem);
339 vma = find_vma(mm, ip);
342 vmstart = vma->vm_start;
345 ret = trace_seq_path(s, &file->f_path);
347 trace_seq_printf(s, "[+0x%lx]",
350 up_read(&mm->mmap_sem);
352 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
353 trace_seq_printf(s, " <" IP_FMT ">", ip);
354 return !trace_seq_has_overflowed(s);
358 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
361 trace_seq_putc(s, '0');
365 if (sym_flags & TRACE_ITER_SYM_OFFSET)
366 seq_print_sym_offset(s, "%s", ip);
368 seq_print_sym_short(s, "%s", ip);
370 if (sym_flags & TRACE_ITER_SYM_ADDR)
371 trace_seq_printf(s, " <" IP_FMT ">", ip);
374 return !trace_seq_has_overflowed(s);
378 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
379 * @s: trace seq struct to write to
380 * @entry: The trace entry field from the ring buffer
382 * Prints the generic fields of irqs off, in hard or softirq, preempt
385 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
393 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
394 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
397 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
398 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
401 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
402 TRACE_FLAG_PREEMPT_RESCHED)) {
403 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
406 case TRACE_FLAG_NEED_RESCHED:
409 case TRACE_FLAG_PREEMPT_RESCHED:
418 (hardirq && softirq) ? 'H' :
423 trace_seq_printf(s, "%c%c%c",
424 irqs_off, need_resched, hardsoft_irq);
426 if (entry->preempt_count)
427 trace_seq_printf(s, "%x", entry->preempt_count);
429 trace_seq_putc(s, '.');
431 return !trace_seq_has_overflowed(s);
435 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
437 char comm[TASK_COMM_LEN];
439 trace_find_cmdline(entry->pid, comm);
441 trace_seq_printf(s, "%8.8s-%-5d %3d",
442 comm, entry->pid, cpu);
444 return trace_print_lat_fmt(s, entry);
448 #define MARK(v, s) {.val = v, .sym = s}
449 /* trace overhead mark */
450 static const struct trace_mark {
451 unsigned long long val; /* unit: nsec */
454 MARK(1000000000ULL , '$'), /* 1 sec */
455 MARK(100000000ULL , '@'), /* 100 msec */
456 MARK(10000000ULL , '*'), /* 10 msec */
457 MARK(1000000ULL , '#'), /* 1000 usecs */
458 MARK(100000ULL , '!'), /* 100 usecs */
459 MARK(10000ULL , '+'), /* 10 usecs */
463 char trace_find_mark(unsigned long long d)
466 int size = ARRAY_SIZE(mark);
468 for (i = 0; i < size; i++) {
473 return (i == size) ? ' ' : mark[i].sym;
477 lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
479 unsigned long verbose = trace_flags & TRACE_ITER_VERBOSE;
480 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
481 unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start;
482 unsigned long long rel_ts = next_ts - iter->ts;
483 struct trace_seq *s = &iter->seq;
486 abs_ts = ns2usecs(abs_ts);
487 rel_ts = ns2usecs(rel_ts);
490 if (verbose && in_ns) {
491 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
492 unsigned long abs_msec = (unsigned long)abs_ts;
493 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
494 unsigned long rel_msec = (unsigned long)rel_ts;
497 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
502 } else if (verbose && !in_ns) {
504 s, "[%016llx] %lld (+%lld): ",
505 iter->ts, abs_ts, rel_ts);
507 } else if (!verbose && in_ns) {
511 trace_find_mark(rel_ts * NSEC_PER_USEC));
513 } else { /* !verbose && !in_ns */
514 trace_seq_printf(s, " %4lld: ", abs_ts);
517 return !trace_seq_has_overflowed(s);
520 int trace_print_context(struct trace_iterator *iter)
522 struct trace_seq *s = &iter->seq;
523 struct trace_entry *entry = iter->ent;
524 unsigned long long t;
525 unsigned long secs, usec_rem;
526 char comm[TASK_COMM_LEN];
528 trace_find_cmdline(entry->pid, comm);
530 trace_seq_printf(s, "%16s-%-5d [%03d] ",
531 comm, entry->pid, iter->cpu);
533 if (trace_flags & TRACE_ITER_IRQ_INFO)
534 trace_print_lat_fmt(s, entry);
536 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
537 t = ns2usecs(iter->ts);
538 usec_rem = do_div(t, USEC_PER_SEC);
539 secs = (unsigned long)t;
540 trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
542 trace_seq_printf(s, " %12llu: ", iter->ts);
544 return !trace_seq_has_overflowed(s);
547 int trace_print_lat_context(struct trace_iterator *iter)
550 /* trace_find_next_entry will reset ent_size */
551 int ent_size = iter->ent_size;
552 struct trace_seq *s = &iter->seq;
553 struct trace_entry *entry = iter->ent,
554 *next_entry = trace_find_next_entry(iter, NULL,
556 unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
558 /* Restore the original ent_size */
559 iter->ent_size = ent_size;
565 char comm[TASK_COMM_LEN];
567 trace_find_cmdline(entry->pid, comm);
570 s, "%16s %5d %3d %d %08x %08lx ",
571 comm, entry->pid, iter->cpu, entry->flags,
572 entry->preempt_count, iter->idx);
574 lat_print_generic(s, entry, iter->cpu);
577 lat_print_timestamp(iter, next_ts);
579 return !trace_seq_has_overflowed(s);
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;
603 key = type & (EVENT_HASHSIZE - 1);
605 hlist_for_each_entry(event, &event_hash[key], node) {
606 if (event->type == type)
613 static LIST_HEAD(ftrace_event_list);
615 static int trace_search_list(struct list_head **list)
617 struct trace_event *e;
618 int last = __TRACE_LAST_TYPE;
620 if (list_empty(&ftrace_event_list)) {
621 *list = &ftrace_event_list;
626 * We used up all possible max events,
627 * lets see if somebody freed one.
629 list_for_each_entry(e, &ftrace_event_list, list) {
630 if (e->type != last + 1)
635 /* Did we used up all 65 thousand events??? */
636 if ((last + 1) > TRACE_EVENT_TYPE_MAX)
643 void trace_event_read_lock(void)
645 down_read(&trace_event_sem);
648 void trace_event_read_unlock(void)
650 up_read(&trace_event_sem);
654 * register_trace_event - register output for an event type
655 * @event: the event type to register
657 * Event types are stored in a hash and this hash is used to
658 * find a way to print an event. If the @event->type is set
659 * then it will use that type, otherwise it will assign a
662 * If you assign your own type, please make sure it is added
663 * to the trace_type enum in trace.h, to avoid collisions
664 * with the dynamic types.
666 * Returns the event type number or zero on error.
668 int register_trace_event(struct trace_event *event)
673 down_write(&trace_event_sem);
678 if (WARN_ON(!event->funcs))
681 INIT_LIST_HEAD(&event->list);
684 struct list_head *list = NULL;
686 if (next_event_type > TRACE_EVENT_TYPE_MAX) {
688 event->type = trace_search_list(&list);
694 event->type = next_event_type++;
695 list = &ftrace_event_list;
698 if (WARN_ON(ftrace_find_event(event->type)))
701 list_add_tail(&event->list, list);
703 } else if (event->type > __TRACE_LAST_TYPE) {
704 printk(KERN_WARNING "Need to add type to trace.h\n");
708 /* Is this event already used */
709 if (ftrace_find_event(event->type))
713 if (event->funcs->trace == NULL)
714 event->funcs->trace = trace_nop_print;
715 if (event->funcs->raw == NULL)
716 event->funcs->raw = trace_nop_print;
717 if (event->funcs->hex == NULL)
718 event->funcs->hex = trace_nop_print;
719 if (event->funcs->binary == NULL)
720 event->funcs->binary = trace_nop_print;
722 key = event->type & (EVENT_HASHSIZE - 1);
724 hlist_add_head(&event->node, &event_hash[key]);
728 up_write(&trace_event_sem);
732 EXPORT_SYMBOL_GPL(register_trace_event);
735 * Used by module code with the trace_event_sem held for write.
737 int __unregister_trace_event(struct trace_event *event)
739 hlist_del(&event->node);
740 list_del(&event->list);
745 * unregister_trace_event - remove a no longer used event
746 * @event: the event to remove
748 int unregister_trace_event(struct trace_event *event)
750 down_write(&trace_event_sem);
751 __unregister_trace_event(event);
752 up_write(&trace_event_sem);
756 EXPORT_SYMBOL_GPL(unregister_trace_event);
762 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
763 struct trace_event *event)
765 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
767 return trace_handle_return(&iter->seq);
771 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
772 struct trace_event *event)
774 struct ftrace_entry *field;
775 struct trace_seq *s = &iter->seq;
777 trace_assign_type(field, iter->ent);
779 seq_print_ip_sym(s, field->ip, flags);
781 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
782 trace_seq_puts(s, " <-");
783 seq_print_ip_sym(s, field->parent_ip, flags);
786 trace_seq_putc(s, '\n');
788 return trace_handle_return(s);
791 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
792 struct trace_event *event)
794 struct ftrace_entry *field;
796 trace_assign_type(field, iter->ent);
798 trace_seq_printf(&iter->seq, "%lx %lx\n",
802 return trace_handle_return(&iter->seq);
805 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
806 struct trace_event *event)
808 struct ftrace_entry *field;
809 struct trace_seq *s = &iter->seq;
811 trace_assign_type(field, iter->ent);
813 SEQ_PUT_HEX_FIELD(s, field->ip);
814 SEQ_PUT_HEX_FIELD(s, field->parent_ip);
816 return trace_handle_return(s);
819 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
820 struct trace_event *event)
822 struct ftrace_entry *field;
823 struct trace_seq *s = &iter->seq;
825 trace_assign_type(field, iter->ent);
827 SEQ_PUT_FIELD(s, field->ip);
828 SEQ_PUT_FIELD(s, field->parent_ip);
830 return trace_handle_return(s);
833 static struct trace_event_functions trace_fn_funcs = {
834 .trace = trace_fn_trace,
837 .binary = trace_fn_bin,
840 static struct trace_event trace_fn_event = {
842 .funcs = &trace_fn_funcs,
845 /* TRACE_CTX an TRACE_WAKE */
846 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
849 struct ctx_switch_entry *field;
850 char comm[TASK_COMM_LEN];
854 trace_assign_type(field, iter->ent);
856 T = task_state_char(field->next_state);
857 S = task_state_char(field->prev_state);
858 trace_find_cmdline(field->next_pid, comm);
859 trace_seq_printf(&iter->seq,
860 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
869 return trace_handle_return(&iter->seq);
872 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
873 struct trace_event *event)
875 return trace_ctxwake_print(iter, "==>");
878 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
879 int flags, struct trace_event *event)
881 return trace_ctxwake_print(iter, " +");
884 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
886 struct ctx_switch_entry *field;
889 trace_assign_type(field, iter->ent);
892 S = task_state_char(field->prev_state);
893 T = task_state_char(field->next_state);
894 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
903 return trace_handle_return(&iter->seq);
906 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
907 struct trace_event *event)
909 return trace_ctxwake_raw(iter, 0);
912 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
913 struct trace_event *event)
915 return trace_ctxwake_raw(iter, '+');
919 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
921 struct ctx_switch_entry *field;
922 struct trace_seq *s = &iter->seq;
925 trace_assign_type(field, iter->ent);
928 S = task_state_char(field->prev_state);
929 T = task_state_char(field->next_state);
931 SEQ_PUT_HEX_FIELD(s, field->prev_pid);
932 SEQ_PUT_HEX_FIELD(s, field->prev_prio);
933 SEQ_PUT_HEX_FIELD(s, S);
934 SEQ_PUT_HEX_FIELD(s, field->next_cpu);
935 SEQ_PUT_HEX_FIELD(s, field->next_pid);
936 SEQ_PUT_HEX_FIELD(s, field->next_prio);
937 SEQ_PUT_HEX_FIELD(s, T);
939 return trace_handle_return(s);
942 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
943 struct trace_event *event)
945 return trace_ctxwake_hex(iter, 0);
948 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
949 struct trace_event *event)
951 return trace_ctxwake_hex(iter, '+');
954 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
955 int flags, struct trace_event *event)
957 struct ctx_switch_entry *field;
958 struct trace_seq *s = &iter->seq;
960 trace_assign_type(field, iter->ent);
962 SEQ_PUT_FIELD(s, field->prev_pid);
963 SEQ_PUT_FIELD(s, field->prev_prio);
964 SEQ_PUT_FIELD(s, field->prev_state);
965 SEQ_PUT_FIELD(s, field->next_cpu);
966 SEQ_PUT_FIELD(s, field->next_pid);
967 SEQ_PUT_FIELD(s, field->next_prio);
968 SEQ_PUT_FIELD(s, field->next_state);
970 return trace_handle_return(s);
973 static struct trace_event_functions trace_ctx_funcs = {
974 .trace = trace_ctx_print,
975 .raw = trace_ctx_raw,
976 .hex = trace_ctx_hex,
977 .binary = trace_ctxwake_bin,
980 static struct trace_event trace_ctx_event = {
982 .funcs = &trace_ctx_funcs,
985 static struct trace_event_functions trace_wake_funcs = {
986 .trace = trace_wake_print,
987 .raw = trace_wake_raw,
988 .hex = trace_wake_hex,
989 .binary = trace_ctxwake_bin,
992 static struct trace_event trace_wake_event = {
994 .funcs = &trace_wake_funcs,
999 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1000 int flags, struct trace_event *event)
1002 struct stack_entry *field;
1003 struct trace_seq *s = &iter->seq;
1007 trace_assign_type(field, iter->ent);
1008 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1010 trace_seq_puts(s, "<stack trace>\n");
1012 for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1014 if (trace_seq_has_overflowed(s))
1017 trace_seq_puts(s, " => ");
1018 seq_print_ip_sym(s, *p, flags);
1019 trace_seq_putc(s, '\n');
1022 return trace_handle_return(s);
1025 static struct trace_event_functions trace_stack_funcs = {
1026 .trace = trace_stack_print,
1029 static struct trace_event trace_stack_event = {
1030 .type = TRACE_STACK,
1031 .funcs = &trace_stack_funcs,
1034 /* TRACE_USER_STACK */
1035 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1036 int flags, struct trace_event *event)
1038 struct userstack_entry *field;
1039 struct trace_seq *s = &iter->seq;
1040 struct mm_struct *mm = NULL;
1043 trace_assign_type(field, iter->ent);
1045 trace_seq_puts(s, "<user stack trace>\n");
1047 if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
1048 struct task_struct *task;
1050 * we do the lookup on the thread group leader,
1051 * since individual threads might have already quit!
1054 task = find_task_by_vpid(field->tgid);
1056 mm = get_task_mm(task);
1060 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1061 unsigned long ip = field->caller[i];
1063 if (ip == ULONG_MAX || trace_seq_has_overflowed(s))
1066 trace_seq_puts(s, " => ");
1069 trace_seq_puts(s, "??");
1070 trace_seq_putc(s, '\n');
1074 seq_print_user_ip(s, mm, ip, flags);
1075 trace_seq_putc(s, '\n');
1081 return trace_handle_return(s);
1084 static struct trace_event_functions trace_user_stack_funcs = {
1085 .trace = trace_user_stack_print,
1088 static struct trace_event trace_user_stack_event = {
1089 .type = TRACE_USER_STACK,
1090 .funcs = &trace_user_stack_funcs,
1094 static enum print_line_t
1095 trace_bputs_print(struct trace_iterator *iter, int flags,
1096 struct trace_event *event)
1098 struct trace_entry *entry = iter->ent;
1099 struct trace_seq *s = &iter->seq;
1100 struct bputs_entry *field;
1102 trace_assign_type(field, entry);
1104 seq_print_ip_sym(s, field->ip, flags);
1105 trace_seq_puts(s, ": ");
1106 trace_seq_puts(s, field->str);
1108 return trace_handle_return(s);
1112 static enum print_line_t
1113 trace_bputs_raw(struct trace_iterator *iter, int flags,
1114 struct trace_event *event)
1116 struct bputs_entry *field;
1117 struct trace_seq *s = &iter->seq;
1119 trace_assign_type(field, iter->ent);
1121 trace_seq_printf(s, ": %lx : ", field->ip);
1122 trace_seq_puts(s, field->str);
1124 return trace_handle_return(s);
1127 static struct trace_event_functions trace_bputs_funcs = {
1128 .trace = trace_bputs_print,
1129 .raw = trace_bputs_raw,
1132 static struct trace_event trace_bputs_event = {
1133 .type = TRACE_BPUTS,
1134 .funcs = &trace_bputs_funcs,
1138 static enum print_line_t
1139 trace_bprint_print(struct trace_iterator *iter, int flags,
1140 struct trace_event *event)
1142 struct trace_entry *entry = iter->ent;
1143 struct trace_seq *s = &iter->seq;
1144 struct bprint_entry *field;
1146 trace_assign_type(field, entry);
1148 seq_print_ip_sym(s, field->ip, flags);
1149 trace_seq_puts(s, ": ");
1150 trace_seq_bprintf(s, field->fmt, field->buf);
1152 return trace_handle_return(s);
1156 static enum print_line_t
1157 trace_bprint_raw(struct trace_iterator *iter, int flags,
1158 struct trace_event *event)
1160 struct bprint_entry *field;
1161 struct trace_seq *s = &iter->seq;
1163 trace_assign_type(field, iter->ent);
1165 trace_seq_printf(s, ": %lx : ", field->ip);
1166 trace_seq_bprintf(s, field->fmt, field->buf);
1168 return trace_handle_return(s);
1171 static struct trace_event_functions trace_bprint_funcs = {
1172 .trace = trace_bprint_print,
1173 .raw = trace_bprint_raw,
1176 static struct trace_event trace_bprint_event = {
1177 .type = TRACE_BPRINT,
1178 .funcs = &trace_bprint_funcs,
1182 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1183 int flags, struct trace_event *event)
1185 struct print_entry *field;
1186 struct trace_seq *s = &iter->seq;
1188 trace_assign_type(field, iter->ent);
1190 seq_print_ip_sym(s, field->ip, flags);
1191 trace_seq_printf(s, ": %s", field->buf);
1193 return trace_handle_return(s);
1196 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1197 struct trace_event *event)
1199 struct print_entry *field;
1201 trace_assign_type(field, iter->ent);
1203 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1205 return trace_handle_return(&iter->seq);
1208 static struct trace_event_functions trace_print_funcs = {
1209 .trace = trace_print_print,
1210 .raw = trace_print_raw,
1213 static struct trace_event trace_print_event = {
1214 .type = TRACE_PRINT,
1215 .funcs = &trace_print_funcs,
1219 static struct trace_event *events[] __initdata = {
1224 &trace_user_stack_event,
1226 &trace_bprint_event,
1231 __init static int init_events(void)
1233 struct trace_event *event;
1236 for (i = 0; events[i]; i++) {
1239 ret = register_trace_event(event);
1241 printk(KERN_WARNING "event %d failed to register\n",
1249 early_initcall(init_events);