linux-kernel - Re: [Freedreno] [PATCH v1 4/4] arm64: dts: sdm845: Add zap shader region for GPU

Open Source and information security mailing list archives

Date:   Wed, 13 Mar 2019 11:42:14 -0400
From:   Rob Clark <robdclark@...il.com>
To:     Jordan Crouse <jcrouse@...eaurora.org>
Cc:     freedreno <freedreno@...ts.freedesktop.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Andy Gross <andy.gross@...aro.org>
Subject: Re: [Freedreno] [PATCH v1 4/4] arm64: dts: sdm845: Add zap shader
 region for GPU

On Tue, Mar 12, 2019 at 2:14 PM Jordan Crouse <jcrouse@...eaurora.org> wrote:
>
> Some Adreno GPU targets require a special zap shader to bring the GPU
> out of secure mode. Define a region to allocate and store the zap
> shader.
>
> Signed-off-by: Jordan Crouse <jcrouse@...eaurora.org>
> ---
>
>  arch/arm64/boot/dts/qcom/sdm845.dtsi | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> index fed7a29..526456d 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> @@ -100,6 +100,11 @@
>                         no-map;
>                 };
>
> +               zap_shader_region: memory@...15000 {
> +                       reg = <0 0x8c415000 0 0x2000>;
> +                       no-map;
> +               };
> +
>                 mpss_region: memory@...00000 {
>                         reg = <0 0x8e000000 0 0x7800000>;
>                         no-map;
> @@ -109,6 +114,8 @@
>                         reg = <0 0x96500000 0 0x200000>;
>                         no-map;
>                 };
> +
> +

I guess we don't really need this hunk..

other than that, the series lgtm

BR,
-R

>         };
>
>         cpus {
> @@ -1514,6 +1521,10 @@
>
>                         qcom,gmu = <&gmu>;
>
> +                       zap-shader {
> +                               memory-region = <&zap_shader_region>;
> +                       };
> +
>                         gpu_opp_table: opp-table {
>                                 compatible = "operating-points-v2";
>
> --
> 2.7.4
>
> _______________________________________________
> Freedreno mailing list
> Freedreno@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/freedreno

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