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arm64: Implement arch_counter_get_cntpct to read the physical counter

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As we are about to use the physical counter on arm64 systems that have
KVM support, implement arch_counter_get_cntpct() and the associated
errata workaround functionality for stable timer reads.

Cc: Will Deacon <[email protected]>
Cc: Mark Rutland <[email protected]>
Acked-by: Catalin Marinas <[email protected]>
Acked-by: Marc Zyngier <[email protected]>
Signed-off-by: Christoffer Dall <[email protected]>
This commit is contained in:
Christoffer Dall 2017-10-18 13:06:25 +02:00
commit f2e600c149
2 changed files with 26 additions and 5 deletions
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8
arch/arm64/include/asm/arch_timer.h
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@ -52,6 +52,7 @@ struct arch_timer_erratum_workaround {
const char *desc;
u32 (*read_cntp_tval_el0)(void);
u32 (*read_cntv_tval_el0)(void);
u64 (*read_cntpct_el0)(void);
u64 (*read_cntvct_el0)(void);
int (*set_next_event_phys)(unsigned long, struct clock_event_device *);
int (*set_next_event_virt)(unsigned long, struct clock_event_device *);
@ -148,11 +149,8 @@ static inline void arch_timer_set_cntkctl(u32 cntkctl)
static inline u64 arch_counter_get_cntpct(void)
{
/*
* AArch64 kernel and user space mandate the use of CNTVCT.
*/
BUG();
return 0;
isb();
return arch_timer_reg_read_stable(cntpct_el0);
}
static inline u64 arch_counter_get_cntvct(void)