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 22:20:20 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Rob Clark <robdclark@...il.com>
Cc:     Jordan Crouse <jcrouse@...eaurora.org>,
        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>,
        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 Wed 13 Mar 08:42 PDT 2019, Rob Clark wrote:

> 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..
> 

I'll trim that as I pick up the patch.

> other than that, the series lgtm
> 

Will you pick up patch 1-3 and I'll pick patch 4 through Andy's tree?

Regards,
Bjorn

> 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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