linux-kernel - Re: [PATCH 2/2] arm64: dts: msm8996: Mark the GPU's SMMU as an adreno one.

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Date:   Mon, 29 Mar 2021 22:23:53 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Eric Anholt <eric@...olt.net>
Cc:     dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, Rob Clark <robdclark@...il.com>,
        Sean Paul <sean@...rly.run>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Robin Murphy <robin.murphy@....com>,
        Will Deacon <will@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Joerg Roedel <joro@...tes.org>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] arm64: dts: msm8996: Mark the GPU's SMMU as an
 adreno one.

On Fri 26 Mar 18:13 CDT 2021, Eric Anholt wrote:

> This enables the adreno-specific SMMU path that sets HUPCF so
> (user-managed) page faults don't wedge the GPU.
> 
> Signed-off-by: Eric Anholt <eric@...olt.net>

Acked-by: Bjorn Andersson <bjorn.andersson@...aro.org>

@Will, can you pick this together with the driver patch? (So that they
land in order)

Regards,
Bjorn

> ---
> 
> We've been seeing a flaky test per day or so in Mesa CI where the
> kernel gets wedged after an iommu fault turns into CP errors.  With
> this patch, the CI isn't throwing the string of CP errors on the
> faults in any of the ~10 jobs I've run so far.
> 
>  arch/arm64/boot/dts/qcom/msm8996.dtsi | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/msm8996.dtsi b/arch/arm64/boot/dts/qcom/msm8996.dtsi
> index 6de136e3add9..432b87ec9c5e 100644
> --- a/arch/arm64/boot/dts/qcom/msm8996.dtsi
> +++ b/arch/arm64/boot/dts/qcom/msm8996.dtsi
> @@ -1127,7 +1127,7 @@ cci_i2c1: i2c-bus@1 {
>  		};
>  
>  		adreno_smmu: iommu@...000 {
> -			compatible = "qcom,msm8996-smmu-v2", "qcom,smmu-v2";
> +			compatible = "qcom,msm8996-smmu-v2", "qcom,adreno-smmu", "qcom,smmu-v2";
>  			reg = <0x00b40000 0x10000>;
>  
>  			#global-interrupts = <1>;
> -- 
> 2.31.0
>