include/trace/boot.h

   1 #ifndef _LINUX_TRACE_BOOT_H
   2 #define _LINUX_TRACE_BOOT_H
   3
   4 #include <linux/module.h>
   5 #include <linux/kallsyms.h>
   6 #include <linux/init.h>
   7
   8 /*
   9  * Structure which defines the trace of an initcall
  10  * while it is called.
  11  * You don't have to fill the func field since it is
  12  * only used internally by the tracer.
  13  */
  14 struct boot_trace_call {
  15         pid_t                   caller;
  16         char                    func[KSYM_SYMBOL_LEN];
  17 };
  18
  19 /*
  20  * Structure which defines the trace of an initcall
  21  * while it returns.
  22  */
  23 struct boot_trace_ret {
  24         char                    func[KSYM_SYMBOL_LEN];
  25         int                             result;
  26         unsigned long long      duration;               /* nsecs */
  27 };
  28
  29 #ifdef CONFIG_BOOT_TRACER
  30 /* Append the traces on the ring-buffer */
  31 extern void trace_boot_call(struct boot_trace_call *bt, initcall_t fn);
  32 extern void trace_boot_ret(struct boot_trace_ret *bt, initcall_t fn);
  33
  34 /* Tells the tracer that smp_pre_initcall is finished.
  35  * So we can start the tracing
  36  */
  37 extern void start_boot_trace(void);
  38
  39 /* Resume the tracing of other necessary events
  40  * such as sched switches
  41  */
  42 extern void enable_boot_trace(void);
  43
  44 /* Suspend this tracing. Actually, only sched_switches tracing have
  45  * to be suspended. Initcalls doesn't need it.)
  46  */
  47 extern void disable_boot_trace(void);
  48 #else
  49 static inline
  50 void trace_boot_call(struct boot_trace_call *bt, initcall_t fn) { }
  51
  52 static inline
  53 void trace_boot_ret(struct boot_trace_ret *bt, initcall_t fn) { }
  54
  55 static inline void start_boot_trace(void) { }
  56 static inline void enable_boot_trace(void) { }
  57 static inline void disable_boot_trace(void) { }
  58 #endif /* CONFIG_BOOT_TRACER */
  59
  60 #endif /* __LINUX_TRACE_BOOT_H */