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 | */ |
14 | typedef unsigned long long cycles_t; |
15 | |
16 | extern unsigned int cpu_khz; |
17 | extern unsigned int tsc_khz; |
18 | |
19 | extern void disable_TSC(void); |
20 | |
21 | static inline cycles_t get_cycles(void) |
22 | { |
23 | if (!IS_ENABLED(CONFIG_X86_TSC) && |
24 | !cpu_feature_enabled(X86_FEATURE_TSC)) |
25 | return 0; |
26 | return rdtsc(); |
27 | } |
28 | #define get_cycles get_cycles |
29 | |
30 | extern struct system_counterval_t convert_art_to_tsc(u64 art); |
31 | extern struct system_counterval_t convert_art_ns_to_tsc(u64 art_ns); |
32 | |
33 | extern void tsc_early_init(void); |
34 | extern void tsc_init(void); |
35 | extern void mark_tsc_unstable(char *reason); |
36 | extern int unsynchronized_tsc(void); |
37 | extern int check_tsc_unstable(void); |
38 | extern void mark_tsc_async_resets(char *reason); |
39 | extern unsigned long native_calibrate_cpu_early(void); |
40 | extern unsigned long native_calibrate_tsc(void); |
41 | extern unsigned long long native_sched_clock_from_tsc(u64 tsc); |
42 | |
43 | extern int tsc_clocksource_reliable; |
44 | #ifdef CONFIG_X86_TSC |
45 | extern bool tsc_async_resets; |
46 | #else |
47 | # define tsc_async_resets false |
48 | #endif |
49 | |
50 | /* |
51 | * Boot-time check whether the TSCs are synchronized across |
52 | * all CPUs/cores: |
53 | */ |
54 | #ifdef CONFIG_X86_TSC |
55 | extern bool tsc_store_and_check_tsc_adjust(bool bootcpu); |
56 | extern void tsc_verify_tsc_adjust(bool resume); |
57 | extern void check_tsc_sync_target(void); |
58 | #else |
59 | static inline bool tsc_store_and_check_tsc_adjust(bool bootcpu) { return false; } |
60 | static inline void tsc_verify_tsc_adjust(bool resume) { } |
61 | static inline void check_tsc_sync_target(void) { } |
62 | #endif |
63 | |
64 | extern int notsc_setup(char *); |
65 | extern void tsc_save_sched_clock_state(void); |
66 | extern void tsc_restore_sched_clock_state(void); |
67 | |
68 | unsigned long cpu_khz_from_msr(void); |
69 | |
70 | #endif /* _ASM_X86_TSC_H */ |
71 | |