linux-kernel - Re: [PATCH RFT 2/2] drm/msm/adreno: Setup SMMU aparture for per-process page table

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Message-ID: <b084d738-19dd-469a-8ac8-e72c76e0997c@kernel.org>
Date: Thu, 3 Oct 2024 18:55:52 +0200
From: Konrad Dybcio <konradybcio@...nel.org>
To: Bjorn Andersson <bjorn.andersson@....qualcomm.com>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>, Rob Clark <robdclark@...il.com>,
 Sean Paul <sean@...rly.run>, Abhinav Kumar <quic_abhinavk@...cinc.com>,
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
 Marijn Suijten <marijn.suijten@...ainline.org>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org
Subject: Re: [PATCH RFT 2/2] drm/msm/adreno: Setup SMMU aparture for
 per-process page table

On 3.10.2024 5:01 AM, Bjorn Andersson wrote:
> Support for per-process page tables requires the SMMU aparture to be
> setup such that the GPU can make updates with the SMMU. On some targets
> this is done statically in firmware, on others it's expected to be
> requested in runtime by the driver, through a SCM call.
> 
> One place where configuration is expected to be done dynamically is the
> QCS6490 rb3gen2.
> 
> The downstream driver does this unconditioanlly on any A6xx and newer,
> so follow suite and make the call.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@....qualcomm.com>
> ---

Not all A6xx targets support PPPT (e.g. A619 on SM6375 - but A619 on SM6350
does..). We already print some error messages when that's the case, I think
this may add one more.

Nonetheless, I think that sticks to the accepted status quo where lacking
PPPT is a bug, so..

Tested-by: Konrad Dybcio <konradybcio@...nel.org> # FP5
Reviewed-by: Konrad Dybcio <konradybcio@...nel.org>

Konrad