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perf: arm_pmuv3: Call kvm_vcpu_pmu_resync_el0() before enabling counters

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[ Upstream commit 04bd15c4cbc3f7bd2399d1baab958c5e738dbfc9 ]

Counting events related to setup of the PMU is not desired, but
kvm_vcpu_pmu_resync_el0() is called just after the PMU counters have
been enabled. Move the call to before enabling the counters.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Tested-by: James Clark <james.clark@linaro.org>
Link: https://lore.kernel.org/r/20250218-arm-brbe-v19-v20-1-4e9922fc2e8e@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Rob Herring (Arm)
2025-02-18 14:39:56 -06:00
committed by Greg Kroah-Hartman
parent 372ed21710
commit 1ae981c91d
1 changed files with 2 additions and 2 deletions
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4
drivers/perf/arm_pmuv3.c
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@@ -751,10 +751,10 @@ static void armv8pmu_start(struct arm_pmu *cpu_pmu)
else else
armv8pmu_disable_user_access(); armv8pmu_disable_user_access();
kvm_vcpu_pmu_resync_el0();
/* Enable all counters */ /* Enable all counters */
armv8pmu_pmcr_write(armv8pmu_pmcr_read() | ARMV8_PMU_PMCR_E); armv8pmu_pmcr_write(armv8pmu_pmcr_read() | ARMV8_PMU_PMCR_E);
kvm_vcpu_pmu_resync_el0();
} }
static void armv8pmu_stop(struct arm_pmu *cpu_pmu) static void armv8pmu_stop(struct arm_pmu *cpu_pmu)