linux-kernel - [PATCH] perf: ARM_SMMU_V3_PMU should depend on ARM_SMMU

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Date:   Tue, 15 Aug 2023 17:36:50 +0200
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>,
        Robin Murphy <robin.murphy@....com>
Cc:     Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        Joerg Roedel <joro@...tes.org>,
        linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH] perf: ARM_SMMU_V3_PMU should depend on ARM_SMMU_V3

There is no point in monitoring transactions passing through the SMMU
when ARM Ltd. System MMU Version 3 (SMMUv3) Support is disabled.
Hence replace the dependency on ARM64 by a dependency on ARM_SMMU_V3
(which implies the former).

Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
This caught my eye after commit 7c3f204e544dfa37 ("perf/smmuv3: Remove
build dependency on ACPI") in arm64/for-next/core.

Perhaps my understanding is wrong? Is there anything to monitor when
ARM_SMMU_V3=n?

 drivers/perf/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/perf/Kconfig b/drivers/perf/Kconfig
index 273d67ecf6d2530f..c33324692fbf0141 100644
--- a/drivers/perf/Kconfig
+++ b/drivers/perf/Kconfig
@@ -92,7 +92,7 @@ config ARM_PMU_ACPI
 
 config ARM_SMMU_V3_PMU
 	 tristate "ARM SMMUv3 Performance Monitors Extension"
-	 depends on ARM64 || (COMPILE_TEST && 64BIT)
+	 depends on ARM_SMMU_V3 || (COMPILE_TEST && 64BIT)
 	 depends on GENERIC_MSI_IRQ
 	   help
 	   Provides support for the ARM SMMUv3 Performance Monitor Counter
-- 
2.34.1