#ifndef _LINUX_TRACE_BOOT_H
#define _LINUX_TRACE_BOOT_H
#include <linux/module.h>
#include <linux/kallsyms.h>
#include <linux/init.h>
/*
* Structure which defines the trace of an initcall
* while it is called.
* You don't have to fill the func field since it is
* only used internally by the tracer.
*/
struct boot_trace_call {
pid_t caller;
char func[KSYM_SYMBOL_LEN];
};
/*
* Structure which defines the trace of an initcall
* while it returns.
*/
struct boot_trace_ret {
char func[KSYM_SYMBOL_LEN];
int result;
unsigned long long duration; /* nsecs */
};
#ifdef CONFIG_BOOT_TRACER
/* Append the traces on the ring-buffer */
extern void trace_boot_call(struct boot_trace_call *bt, initcall_t fn);
extern void trace_boot_ret(struct boot_trace_ret *bt, initcall_t fn);
/* Tells the tracer that smp_pre_initcall is finished.
* So we can start the tracing
*/
extern void start_boot_trace(void);
/* Resume the tracing of other necessary events
* such as sched switches
*/
extern void enable_boot_trace(void);
/* Suspend this tracing. Actually, only sched_switches tracing have
* to be suspended. Initcalls doesn't need it.)
*/
extern void disable_boot_trace(void);
#else
static inline
void trace_boot_call(struct boot_trace_call *bt, initcall_t fn) { }
static inline
void trace_boot_ret(struct boot_trace_ret *bt, initcall_t fn) { }
static inline void start_boot_trace(void) { }
static inline void enable_boot_trace(void) { }
static inline void disable_boot_trace(void) { }
#endif /* CONFIG_BOOT_TRACER */
#endif /* __LINUX_TRACE_BOOT_H */
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