mirror of
https://github.com/torvalds/linux.git
synced 2024-12-27 21:33:00 +00:00
c48ec42d6e
check_tsc_disabled() was introduced by commit:c73deb6aec("perf/x86: Add ability to calculate TSC from perf sample timestamps") The only caller was arch_perf_update_userpage(), which had been refactored by commit:d8b11a0cbd("perf/x86: Clean up cap_user_time* setting") ... so no need keep and export it any more. Signed-off-by: Wei Jiangang <weijg.fnst@cn.fujitsu.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: a.p.zijlstra@chello.nl Cc: adrian.hunter@intel.com Cc: bp@suse.de Link: http://lkml.kernel.org/r/1468570330-25810-1-git-send-email-weijg.fnst@cn.fujitsu.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
/*
|
|
* x86 TSC related functions
|
|
*/
|
|
#ifndef _ASM_X86_TSC_H
|
|
#define _ASM_X86_TSC_H
|
|
|
|
#include <asm/processor.h>
|
|
|
|
#define NS_SCALE 10 /* 2^10, carefully chosen */
|
|
#define US_SCALE 32 /* 2^32, arbitralrily chosen */
|
|
|
|
/*
|
|
* Standard way to access the cycle counter.
|
|
*/
|
|
typedef unsigned long long cycles_t;
|
|
|
|
extern unsigned int cpu_khz;
|
|
extern unsigned int tsc_khz;
|
|
|
|
extern void disable_TSC(void);
|
|
|
|
static inline cycles_t get_cycles(void)
|
|
{
|
|
#ifndef CONFIG_X86_TSC
|
|
if (!boot_cpu_has(X86_FEATURE_TSC))
|
|
return 0;
|
|
#endif
|
|
|
|
return rdtsc();
|
|
}
|
|
|
|
extern struct system_counterval_t convert_art_to_tsc(cycle_t art);
|
|
|
|
extern void tsc_init(void);
|
|
extern void mark_tsc_unstable(char *reason);
|
|
extern int unsynchronized_tsc(void);
|
|
extern int check_tsc_unstable(void);
|
|
extern unsigned long native_calibrate_cpu(void);
|
|
extern unsigned long native_calibrate_tsc(void);
|
|
extern unsigned long long native_sched_clock_from_tsc(u64 tsc);
|
|
|
|
extern int tsc_clocksource_reliable;
|
|
|
|
/*
|
|
* Boot-time check whether the TSCs are synchronized across
|
|
* all CPUs/cores:
|
|
*/
|
|
extern void check_tsc_sync_source(int cpu);
|
|
extern void check_tsc_sync_target(void);
|
|
|
|
extern int notsc_setup(char *);
|
|
extern void tsc_save_sched_clock_state(void);
|
|
extern void tsc_restore_sched_clock_state(void);
|
|
|
|
unsigned long cpu_khz_from_msr(void);
|
|
|
|
#endif /* _ASM_X86_TSC_H */
|