mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-20 08:32:23 +07:00
28a00184be
tsc=reliable boot parameter is supposed to skip all the TSC stablility checks during boot time. On a 8-socket system where we want to run an experiment with the "tsc=reliable" boot option, TSC synchronization checks are not getting skipped and marking the TSC as not stable. Check for tsc_clocksource_reliable (which is set via tsc=reliable or for platforms supporting synthetic TSC_RELIABLE feature bit etc) and when set, skip the TSC synchronization tests during boot. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Acked-by: John Stultz <johnstul@us.ibm.com> Tested-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Link: http://lkml.kernel.org/r/1320446537.15071.14.camel@sbsiddha-desk.sc.intel.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
68 lines
1.4 KiB
C
68 lines
1.4 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)
|
|
{
|
|
unsigned long long ret = 0;
|
|
|
|
#ifndef CONFIG_X86_TSC
|
|
if (!cpu_has_tsc)
|
|
return 0;
|
|
#endif
|
|
rdtscll(ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static __always_inline cycles_t vget_cycles(void)
|
|
{
|
|
/*
|
|
* We only do VDSOs on TSC capable CPUs, so this shouldn't
|
|
* access boot_cpu_data (which is not VDSO-safe):
|
|
*/
|
|
#ifndef CONFIG_X86_TSC
|
|
if (!cpu_has_tsc)
|
|
return 0;
|
|
#endif
|
|
return (cycles_t)__native_read_tsc();
|
|
}
|
|
|
|
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_tsc(void);
|
|
|
|
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 save_sched_clock_state(void);
|
|
extern void restore_sched_clock_state(void);
|
|
|
|
#endif /* _ASM_X86_TSC_H */
|