1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * x86 TSC related functions 4 */ 5#ifndef _ASM_X86_TSC_H 6#define _ASM_X86_TSC_H 7 8#include <asm/processor.h> 9#include <asm/cpufeature.h> 10 11/* 12 * Standard way to access the cycle counter. 13 */ 14typedef unsigned long long cycles_t; 15 16extern unsigned int cpu_khz; 17extern unsigned int tsc_khz; 18 19extern void disable_TSC(void); 20 21static inline cycles_t get_cycles(void) 22{ 23#ifndef CONFIG_X86_TSC 24 if (!boot_cpu_has(X86_FEATURE_TSC)) 25 return 0; 26#endif 27 28 return rdtsc(); 29} 30 31extern struct system_counterval_t convert_art_to_tsc(u64 art); 32extern struct system_counterval_t convert_art_ns_to_tsc(u64 art_ns); 33 34extern void tsc_early_init(void); 35extern void tsc_init(void); 36extern unsigned long calibrate_delay_is_known(void); 37extern void mark_tsc_unstable(char *reason); 38extern int unsynchronized_tsc(void); 39extern int check_tsc_unstable(void); 40extern void mark_tsc_async_resets(char *reason); 41extern unsigned long native_calibrate_cpu_early(void); 42extern unsigned long native_calibrate_tsc(void); 43extern unsigned long long native_sched_clock_from_tsc(u64 tsc); 44 45extern int tsc_clocksource_reliable; 46#ifdef CONFIG_X86_TSC 47extern bool tsc_async_resets; 48#else 49# define tsc_async_resets false 50#endif 51 52/* 53 * Boot-time check whether the TSCs are synchronized across 54 * all CPUs/cores: 55 */ 56#ifdef CONFIG_X86_TSC 57extern bool tsc_store_and_check_tsc_adjust(bool bootcpu); 58extern void tsc_verify_tsc_adjust(bool resume); 59extern void check_tsc_sync_source(int cpu); 60extern void check_tsc_sync_target(void); 61#else 62static inline bool tsc_store_and_check_tsc_adjust(bool bootcpu) { return false; } 63static inline void tsc_verify_tsc_adjust(bool resume) { } 64static inline void check_tsc_sync_source(int cpu) { } 65static inline void check_tsc_sync_target(void) { } 66#endif 67 68extern int notsc_setup(char *); 69extern void tsc_save_sched_clock_state(void); 70extern void tsc_restore_sched_clock_state(void); 71 72unsigned long cpu_khz_from_msr(void); 73 74#endif /* _ASM_X86_TSC_H */ 75