[PATCH 6/9] KVM: arm64: pmu: Use generated define for PMSELR_EL0.SEL access

Rob Herring (Arm)
2024-06-07T20:32:49Z

ARMV8_PMU_COUNTER_MASK is really a mask for the PMSELR_EL0.SEL register
field. Make that clear by adding a standard sysreg definition for the
register, and using it instead.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
---
arch/arm64/include/asm/sysreg.h | 1 -
arch/arm64/kvm/sys_regs.c | 10 +++++-----
arch/arm64/tools/sysreg | 5 +++++
include/linux/perf/arm_pmuv3.h | 1 -
4 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index af3b206fa423..b0d6c33f9ecc 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -403,7 +403,6 @@
#define SYS_PMCNTENCLR_EL0 sys_reg(3, 3, 9, 12, 2)
#define SYS_PMOVSCLR_EL0 sys_reg(3, 3, 9, 12, 3)
#define SYS_PMSWINC_EL0 sys_reg(3, 3, 9, 12, 4)
-#define SYS_PMSELR_EL0 sys_reg(3, 3, 9, 12, 5)
#define SYS_PMCEID0_EL0 sys_reg(3, 3, 9, 12, 6)
#define SYS_PMCEID1_EL0 sys_reg(3, 3, 9, 12, 7)
#define SYS_PMCCNTR_EL0 sys_reg(3, 3, 9, 13, 0)
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 22b45a15d068..f8b5db48ea8a 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -880,7 +880,7 @@ static u64 reset_pmevtyper(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
static u64 reset_pmselr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
{
reset_unknown(vcpu, r);
- __vcpu_sys_reg(vcpu, r->reg) &= ARMV8_PMU_COUNTER_MASK;
+ __vcpu_sys_reg(vcpu, r->reg) &= PMSELR_EL0_SEL_MASK;

return __vcpu_sys_reg(vcpu, r->reg);
}
@@ -972,7 +972,7 @@ static bool access_pmselr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
else
/* return PMSELR.SEL field */
p->regval = __vcpu_sys_reg(vcpu, PMSELR_EL0)
- & ARMV8_PMU_COUNTER_MASK;
+ & PMSELR_EL0_SEL_MASK;

return true;
}
@@ -1040,8 +1040,8 @@ static bool access_pmu_evcntr(struct kvm_vcpu *vcpu,
if (pmu_access_event_counter_el0_disabled(vcpu))
return false;

- idx = __vcpu_sys_reg(vcpu, PMSELR_EL0)
- & ARMV8_PMU_COUNTER_MASK;
+ idx = SYS_FIELD_GET(PMSELR_EL0, SEL,
+ __vcpu_sys_reg(vcpu, PMSELR_EL0));
} else if (r->Op2 == 0) {
/* PMCCNTR_EL0 */
if (pmu_access_cycle_counter_el0_disabled(vcpu))
@@ -1091,7 +1091,7 @@ static bool access_pmu_evtyper(struct kvm_vcpu *vcpu, struct sys_reg_params *p,

if (r->CRn == 9 && r->CRm == 13 && r->Op2 == 1) {
/* PMXEVTYPER_EL0 */
- idx = __vcpu_sys_reg(vcpu, PMSELR_EL0) & ARMV8_PMU_COUNTER_MASK;
+ idx = SYS_FIELD_GET(PMSELR_EL0, SEL, __vcpu_sys_reg(vcpu, PMSELR_EL0));
reg = PMEVTYPER0_EL0 + idx;
} else if (r->CRn == 14 && (r->CRm & 12) == 12) {
idx = ((r->CRm & 3) << 3) | (r->Op2 & 7);
diff --git a/arch/arm64/tools/sysreg b/arch/arm64/tools/sysreg
index a4c1dd4741a4..231817a379b5 100644
--- a/arch/arm64/tools/sysreg
+++ b/arch/arm64/tools/sysreg
@@ -2153,6 +2153,11 @@ Field 4 P
Field 3:0 ALIGN
EndSysreg

+Sysreg PMSELR_EL0 3 3 9 12 5
+Res0 63:5
+Field 4:0 SEL
+EndSysreg
+
SysregFields CONTEXTIDR_ELx
Res0 63:32
Field 31:0 PROCID
diff --git a/include/linux/perf/arm_pmuv3.h b/include/linux/perf/arm_pmuv3.h
index 46377e134d67..caa09241ad4f 100644
--- a/include/linux/perf/arm_pmuv3.h
+++ b/include/linux/perf/arm_pmuv3.h
@@ -7,7 +7,6 @@
#define __PERF_ARM_PMUV3_H

#define ARMV8_PMU_MAX_COUNTERS 32
-#define ARMV8_PMU_COUNTER_MASK (ARMV8_PMU_MAX_COUNTERS - 1)

/*
* Common architectural and microarchitectural event numbers.

--
2.43.0