Release 4.14 arch/x86/include/asm/tsc.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * 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();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andres Salomon
21
72.41%
1
25.00%
Borislav Petkov
4
13.79%
1
25.00%
Glauber de Oliveira Costa
3
10.34%
1
25.00%
Andrew Lutomirski
1
3.45%
1
25.00%
Total
29
100.00%
4
100.00%

extern struct system_counterval_t convert_art_to_tsc(u64 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:
 */
#ifdef CONFIG_X86_TSC
extern bool tsc_store_and_check_tsc_adjust(bool bootcpu);
extern void tsc_verify_tsc_adjust(bool resume);
extern void check_tsc_sync_source(int cpu);
extern void check_tsc_sync_target(void);
#else


static inline bool tsc_store_and_check_tsc_adjust(bool bootcpu) { return false; }
Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Gleixner
13
100.00%
4
100.00%
Total
13
100.00%
4
100.00%



static inline void tsc_verify_tsc_adjust(bool resume) { }
Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Gleixner
9
100.00%
2
100.00%
Total
9
100.00%
2
100.00%



static inline void check_tsc_sync_source(int cpu) { }
Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Gleixner
9
100.00%
1
100.00%
Total
9
100.00%
1
100.00%



static inline void check_tsc_sync_target(void) { }
Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Gleixner
8
100.00%
1
100.00%
Total
8
100.00%
1
100.00%

#endif

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 */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Gleixner
99
39.13%
12
40.00%
Andres Salomon
75
29.64%
1
3.33%
Suresh B. Siddha
16
6.32%
2
6.67%
Andi Kleen
10
3.95%
1
3.33%
Glauber de Oliveira Costa
10
3.95%
2
6.67%
Len Brown
9
3.56%
2
6.67%
Christopher S. Hall
8
3.16%
1
3.33%
Rusty Russell
6
2.37%
1
3.33%
John Stultz
5
1.98%
2
6.67%
Borislav Petkov
4
1.58%
1
3.33%
Bin Gao
4
1.58%
1
3.33%
H. Peter Anvin
3
1.19%
1
3.33%
Marcelo Tosatti
2
0.79%
1
3.33%
Greg Kroah-Hartman
1
0.40%
1
3.33%
Andrew Lutomirski
1
0.40%
1
3.33%
Total
253
100.00%
30
100.00%
Directory: arch/x86/include/asm

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.