kernel/trace/trace_events.h

   1 #ifndef _LINUX_KERNEL_TRACE_EVENTS_H
   2 #define _LINUX_KERNEL_TRACE_EVENTS_H
   3
   4 #include <linux/debugfs.h>
   5 #include <linux/ftrace.h>
   6 #include "trace.h"
   7
   8 struct ftrace_event_call {
   9         char            *name;
  10         char            *system;
  11         struct dentry   *dir;
  12         int             enabled;
  13         int             (*regfunc)(void);
  14         void            (*unregfunc)(void);
  15 };
  16
  17
  18 #undef TPFMT
  19 #define TPFMT(fmt, args...)     fmt "\n", ##args
  20
  21 #undef TRACE_FORMAT
  22 #define TRACE_FORMAT(call, proto, args, fmt)                            \
  23 static void ftrace_event_##call(proto)                                  \
  24 {                                                                       \
  25         event_trace_printk(_RET_IP_, "(" #call ") " fmt);               \
  26 }                                                                       \
  27                                                                         \
  28 static int ftrace_reg_event_##call(void)                                \
  29 {                                                                       \
  30         int ret;                                                        \
  31                                                                         \
  32         ret = register_trace_##call(ftrace_event_##call);               \
  33         if (!ret)                                                       \
  34                 pr_info("event trace: Could not activate trace point "  \
  35                         "probe to " #call);                             \
  36         return ret;                                                     \
  37 }                                                                       \
  38                                                                         \
  39 static void ftrace_unreg_event_##call(void)                             \
  40 {                                                                       \
  41         unregister_trace_##call(ftrace_event_##call);                   \
  42 }                                                                       \
  43                                                                         \
  44 static struct ftrace_event_call __used                                  \
  45 __attribute__((__aligned__(4)))                                         \
  46 __attribute__((section("_ftrace_events"))) event_##call = {             \
  47         .name                   = #call,                                \
  48         .system                 = STR(TRACE_SYSTEM),                    \
  49         .regfunc                = ftrace_reg_event_##call,              \
  50         .unregfunc              = ftrace_unreg_event_##call,            \
  51 }
  52
  53 void event_trace_printk(unsigned long ip, const char *fmt, ...);
  54 extern struct ftrace_event_call __start_ftrace_events[];
  55 extern struct ftrace_event_call __stop_ftrace_events[];
  56
  57 #endif /* _LINUX_KERNEL_TRACE_EVENTS_H */