linux-kernel - [PATCH 2/2] arm64: dts: qcom: sm8250: Enable per-process page tables.

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Date:   Tue, 14 Jun 2022 16:01:36 -0700
From:   Emma Anholt <emma@...olt.net>
To:     dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, Rob Clark <robdclark@...il.com>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>
Cc:     linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, Emma Anholt <emma@...olt.net>
Subject: [PATCH 2/2] arm64: dts: qcom: sm8250: Enable per-process page tables.

This is an SMMU for the adreno gpu, and adding this compatible lets
the driver use per-fd page tables, which are required for security
between GPU clients.

Signed-off-by: Emma Anholt <emma@...olt.net>
---

Tested with a full deqp-vk run on RB5, which did involve some iommu faults.

 arch/arm64/boot/dts/qcom/sm8250.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/sm8250.dtsi b/arch/arm64/boot/dts/qcom/sm8250.dtsi
index a92230bec1dd..483c0e0f1d1a 100644
--- a/arch/arm64/boot/dts/qcom/sm8250.dtsi
+++ b/arch/arm64/boot/dts/qcom/sm8250.dtsi
@@ -2513,7 +2513,7 @@ gpucc: clock-controller@...0000 {
 		};
 
 		adreno_smmu: iommu@...0000 {
-			compatible = "qcom,sm8250-smmu-500", "arm,mmu-500";
+			compatible = "qcom,sm8250-smmu-500", "arm,mmu-500", "qcom,adreno-smmu";
 			reg = <0 0x03da0000 0 0x10000>;
 			#iommu-cells = <2>;
 			#global-interrupts = <2>;
-- 
2.36.1