include/trace/boot.h

   1 #ifndef _LINUX_TRACE_BOOT_H
   2 #define _LINUX_TRACE_BOOT_H
   3
   4 /*
   5  * Structure which defines the trace of an initcall
   6  * while it is called.
   7  * You don't have to fill the func field since it is
   8  * only used internally by the tracer.
   9  */
  10 struct boot_trace_call {
  11         pid_t                   caller;
  12         char                    func[KSYM_NAME_LEN];
  13 };
  14
  15 /*
  16  * Structure which defines the trace of an initcall
  17  * while it returns.
  18  */
  19 struct boot_trace_ret {
  20         char                    func[KSYM_NAME_LEN];
  21         int                             result;
  22         unsigned long long      duration;               /* nsecs */
  23 };
  24
  25 #ifdef CONFIG_BOOT_TRACER
  26 /* Append the traces on the ring-buffer */
  27 extern void trace_boot_call(struct boot_trace_call *bt, initcall_t fn);
  28 extern void trace_boot_ret(struct boot_trace_ret *bt, initcall_t fn);
  29
  30 /* Tells the tracer that smp_pre_initcall is finished.
  31  * So we can start the tracing
  32  */
  33 extern void start_boot_trace(void);
  34
  35 /* Resume the tracing of other necessary events
  36  * such as sched switches
  37  */
  38 extern void enable_boot_trace(void);
  39
  40 /* Suspend this tracing. Actually, only sched_switches tracing have
  41  * to be suspended. Initcalls doesn't need it.)
  42  */
  43 extern void disable_boot_trace(void);
  44 #else
  45 static inline
  46 void trace_boot_call(struct boot_trace_call *bt, initcall_t fn) { }
  47
  48 static inline
  49 void trace_boot_ret(struct boot_trace_ret *bt, initcall_t fn) { }
  50
  51 static inline void start_boot_trace(void) { }
  52 static inline void enable_boot_trace(void) { }
  53 static inline void disable_boot_trace(void) { }
  54 #endif /* CONFIG_BOOT_TRACER */
  55
  56 #endif /* __LINUX_TRACE_BOOT_H */