From: "Rob Herring (Arm)" <robh@kernel.org>
To: Will Deacon <will@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Jonathan Corbet <corbet@lwn.net>, Marc Zyngier <maz@kernel.org>,
Oliver Upton <oliver.upton@linux.dev>,
Joey Gouly <joey.gouly@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Zenghui Yu <yuzenghui@huawei.com>,
James Clark <james.clark@linaro.org>,
Anshuman Khandual <anshuman.khandual@arm.com>,
Leo Yan <leo.yan@arm.com>
Cc: linux-arm-kernel@lists.infradead.org,
linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-doc@vger.kernel.org, kvmarm@lists.linux.dev
Subject: [PATCH v20 01/11] perf: arm_pmuv3: Call kvm_vcpu_pmu_resync_el0() before enabling counters
Date: Tue, 18 Feb 2025 14:39:56 -0600 [thread overview]
Message-ID: <20250218-arm-brbe-v19-v20-1-4e9922fc2e8e@kernel.org> (raw)
In-Reply-To: <20250218-arm-brbe-v19-v20-0-4e9922fc2e8e@kernel.org>
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>
---
drivers/perf/arm_pmuv3.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/perf/arm_pmuv3.c b/drivers/perf/arm_pmuv3.c
index 0e360feb3432..9ebc950559c0 100644
--- a/drivers/perf/arm_pmuv3.c
+++ b/drivers/perf/arm_pmuv3.c
@@ -825,10 +825,10 @@ static void armv8pmu_start(struct arm_pmu *cpu_pmu)
else
armv8pmu_disable_user_access();
+ kvm_vcpu_pmu_resync_el0();
+
/* Enable all counters */
armv8pmu_pmcr_write(armv8pmu_pmcr_read() | ARMV8_PMU_PMCR_E);
-
- kvm_vcpu_pmu_resync_el0();
}
static void armv8pmu_stop(struct arm_pmu *cpu_pmu)
--
2.47.2
next prev parent reply other threads:[~2025-02-18 20:40 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-18 20:39 [PATCH v20 00/11] arm64/perf: Enable branch stack sampling Rob Herring (Arm)
2025-02-18 20:39 ` Rob Herring (Arm) [this message]
2025-02-18 20:39 ` [PATCH v20 02/11] perf: arm_pmu: Don't disable counter in armpmu_add() Rob Herring (Arm)
2025-02-18 20:39 ` [PATCH v20 03/11] perf: arm_pmuv3: Don't disable counter in armv8pmu_enable_event() Rob Herring (Arm)
2025-02-18 20:39 ` [PATCH v20 04/11] perf: arm_v7_pmu: Drop obvious comments for enabling/disabling counters and interrupts Rob Herring (Arm)
2025-02-18 20:40 ` [PATCH v20 05/11] perf: arm_v7_pmu: Don't disable counter in (armv7|krait_|scorpion_)pmu_enable_event() Rob Herring (Arm)
2025-02-18 20:40 ` [PATCH v20 06/11] perf: apple_m1: Don't disable counter in m1_pmu_enable_event() Rob Herring (Arm)
2025-02-18 20:40 ` [PATCH v20 07/11] perf: arm_pmu: Move PMUv3-specific data Rob Herring (Arm)
2025-02-18 20:40 ` [PATCH v20 08/11] arm64/sysreg: Add BRBE registers and fields Rob Herring (Arm)
2025-02-18 20:40 ` [PATCH v20 09/11] arm64: Handle BRBE booting requirements Rob Herring (Arm)
2025-02-18 20:40 ` [PATCH v20 10/11] KVM: arm64: nvhe: Disable branch generation in nVHE guests Rob Herring (Arm)
2025-02-24 10:41 ` Leo Yan
2025-02-18 20:40 ` [PATCH v20 11/11] perf: arm_pmuv3: Add support for the Branch Record Buffer Extension (BRBE) Rob Herring (Arm)
2025-02-24 12:25 ` Leo Yan
2025-02-24 12:46 ` Rob Herring
2025-02-24 14:03 ` Leo Yan
2025-02-24 16:05 ` Mark Rutland
2025-02-24 18:03 ` Leo Yan
2025-02-25 1:31 ` Rob Herring
2025-02-25 12:38 ` Leo Yan
2025-02-25 15:35 ` Rob Herring
2025-02-25 19:46 ` Mark Rutland
2025-02-25 12:01 ` Mark Rutland
2025-02-25 17:48 ` Leo Yan
2025-02-25 19:04 ` Rob Herring
2025-02-25 19:58 ` Mark Rutland
2025-02-26 13:48 ` Leo Yan
2025-02-26 14:26 ` Rob Herring
2025-02-19 16:09 ` [PATCH v20 00/11] arm64/perf: Enable branch stack sampling James Clark
2025-03-01 7:05 ` Will Deacon
2025-03-03 16:44 ` Rob Herring
2025-03-04 11:25 ` Catalin Marinas
2025-03-04 16:25 ` Mark Rutland
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