kernel/trace/trace_output.h

   1 #ifndef __TRACE_EVENTS_H
   2 #define __TRACE_EVENTS_H
   3
   4 #include "trace.h"
   5
   6 typedef int (*trace_print_func)(struct trace_seq *s, struct trace_entry *entry,
   7                                 int flags);
   8
   9 struct trace_event {
  10         struct hlist_node       node;
  11         int                     type;
  12         trace_print_func        trace;
  13         trace_print_func        latency_trace;
  14         trace_print_func        raw;
  15         trace_print_func        hex;
  16         trace_print_func        binary;
  17 };
  18
  19 extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...);
  20 extern int
  21 seq_print_ip_sym(struct trace_seq *s, unsigned long ip,
  22                 unsigned long sym_flags);
  23 extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
  24                                  size_t cnt);
  25 int trace_seq_puts(struct trace_seq *s, const char *str);
  26 int trace_seq_putc(struct trace_seq *s, unsigned char c);
  27 int trace_seq_putmem(struct trace_seq *s, void *mem, size_t len);
  28 int trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len);
  29 int trace_seq_path(struct trace_seq *s, struct path *path);
  30 int seq_print_userip_objs(const struct userstack_entry *entry,
  31                           struct trace_seq *s, unsigned long sym_flags);
  32 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
  33                       unsigned long ip, unsigned long sym_flags);
  34
  35 struct trace_event *ftrace_find_event(int type);
  36 int register_ftrace_event(struct trace_event *event);
  37 int unregister_ftrace_event(struct trace_event *event);
  38
  39 int
  40 trace_nop_print(struct trace_seq *s, struct trace_entry *entry, int flags);
  41
  42 #define MAX_MEMHEX_BYTES        8
  43 #define HEX_CHARS               (MAX_MEMHEX_BYTES*2 + 1)
  44
  45 #define SEQ_PUT_FIELD_RET(s, x)                         \
  46 do {                                                    \
  47         if (!trace_seq_putmem(s, &(x), sizeof(x)))      \
  48                 return 0;                               \
  49 } while (0)
  50
  51 #define SEQ_PUT_HEX_FIELD_RET(s, x)                     \
  52 do {                                                    \
  53         BUILD_BUG_ON(sizeof(x) > MAX_MEMHEX_BYTES);     \
  54         if (!trace_seq_putmem_hex(s, &(x), sizeof(x)))  \
  55                 return 0;                               \
  56 } while (0)
  57
  58 #endif
  59