linux-kernel - Re: [PATCH RFT 1/2] firmware: qcom: scm: Introduce CP_SMMU_APERTURE

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Message-ID: <c30baaca-beaf-485c-88b4-984febf06519@kernel.org>
Date: Thu, 3 Oct 2024 18:48:13 +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 1/2] firmware: qcom: scm: Introduce
 CP_SMMU_APERTURE_ID

On 3.10.2024 5:01 AM, Bjorn Andersson wrote:
> The QCOM_SCM_SVC_MP service provides QCOM_SCM_MP_CP_SMMU_APERTURE_ID,
> which is used to trigger the mapping of register banks into the SMMU
> context for per-processes page tables to function (in case this isn't
> statically setup by firmware).
> 
> This is necessary on e.g. QCS6490 Rb3Gen2, in order to avoid "CP | AHB
> bus error"-errors from the GPU.
> 
> Introduce a function to allow the msm driver to invoke this call.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@....qualcomm.com>
> ---

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

Konrad