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