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

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Date:   Wed, 15 Jun 2022 13:28:12 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Emma Anholt <emma@...olt.net>
Cc:     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>, linux-kernel@...r.kernel.org,
        iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/2] arm64: dts: qcom: sm8250: Enable per-process page tables.

On Wed, 15 Jun 2022 at 02:01, Emma Anholt <emma@...olt.net> wrote:
>
> 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";

I see that other dtsi files use a bit different order for the
compatibility strings. They put "qcom,adreno-smmu" before
"arm,mmu-500". Can we please follow them?

With that fixed:
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

>                         reg = <0 0x03da0000 0 0x10000>;
>                         #iommu-cells = <2>;
>                         #global-interrupts = <2>;
> --
> 2.36.1
>


-- 
With best wishes
Dmitry