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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 <will.deacon@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Christoffer Dall 2017-10-18 13:06:25 +02:00
parent 8a5776a5f4
commit f2e600c149
2 changed files with 26 additions and 5 deletions
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8
arch/arm64/include/asm/arch_timer.h
View file

@ -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)

23
drivers/clocksource/arm_arch_timer.c
View file

@ -217,6 +217,11 @@ static u32 notrace fsl_a008585_read_cntv_tval_el0(void)
return __fsl_a008585_read_reg(cntv_tval_el0);
}
static u64 notrace fsl_a008585_read_cntpct_el0(void)
{
return __fsl_a008585_read_reg(cntpct_el0);
}
static u64 notrace fsl_a008585_read_cntvct_el0(void)
{
return __fsl_a008585_read_reg(cntvct_el0);
@ -258,6 +263,11 @@ static u32 notrace hisi_161010101_read_cntv_tval_el0(void)
return __hisi_161010101_read_reg(cntv_tval_el0);
}
static u64 notrace hisi_161010101_read_cntpct_el0(void)
{
return __hisi_161010101_read_reg(cntpct_el0);
}
static u64 notrace hisi_161010101_read_cntvct_el0(void)
{
return __hisi_161010101_read_reg(cntvct_el0);
@ -288,6 +298,15 @@ static struct ate_acpi_oem_info hisi_161010101_oem_info[] = {
#endif
#ifdef CONFIG_ARM64_ERRATUM_858921
static u64 notrace arm64_858921_read_cntpct_el0(void)
{
u64 old, new;
old = read_sysreg(cntpct_el0);
new = read_sysreg(cntpct_el0);
return (((old ^ new) >> 32) & 1) ? old : new;
}
static u64 notrace arm64_858921_read_cntvct_el0(void)
{
u64 old, new;
@ -346,6 +365,7 @@ static const struct arch_timer_erratum_workaround ool_workarounds[] = {
.desc = "Freescale erratum a005858",
.read_cntp_tval_el0 = fsl_a008585_read_cntp_tval_el0,
.read_cntv_tval_el0 = fsl_a008585_read_cntv_tval_el0,
.read_cntpct_el0 = fsl_a008585_read_cntpct_el0,
.read_cntvct_el0 = fsl_a008585_read_cntvct_el0,
.set_next_event_phys = erratum_set_next_event_tval_phys,
.set_next_event_virt = erratum_set_next_event_tval_virt,
@ -358,6 +378,7 @@ static const struct arch_timer_erratum_workaround ool_workarounds[] = {
.desc = "HiSilicon erratum 161010101",
.read_cntp_tval_el0 = hisi_161010101_read_cntp_tval_el0,
.read_cntv_tval_el0 = hisi_161010101_read_cntv_tval_el0,
.read_cntpct_el0 = hisi_161010101_read_cntpct_el0,
.read_cntvct_el0 = hisi_161010101_read_cntvct_el0,
.set_next_event_phys = erratum_set_next_event_tval_phys,
.set_next_event_virt = erratum_set_next_event_tval_virt,
@ -368,6 +389,7 @@ static const struct arch_timer_erratum_workaround ool_workarounds[] = {
.desc = "HiSilicon erratum 161010101",
.read_cntp_tval_el0 = hisi_161010101_read_cntp_tval_el0,
.read_cntv_tval_el0 = hisi_161010101_read_cntv_tval_el0,
.read_cntpct_el0 = hisi_161010101_read_cntpct_el0,
.read_cntvct_el0 = hisi_161010101_read_cntvct_el0,
.set_next_event_phys = erratum_set_next_event_tval_phys,
.set_next_event_virt = erratum_set_next_event_tval_virt,
@ -378,6 +400,7 @@ static const struct arch_timer_erratum_workaround ool_workarounds[] = {
.match_type = ate_match_local_cap_id,
.id = (void *)ARM64_WORKAROUND_858921,
.desc = "ARM erratum 858921",
.read_cntpct_el0 = arm64_858921_read_cntpct_el0,
.read_cntvct_el0 = arm64_858921_read_cntvct_el0,
},
#endif