linux-kernel - Re: [RFC PATCH 00/11] Affirm SMMU coherent pagetable walker capability on RPMh SoCs

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Message-Id: <D4A2FKPTXHS5.3AHU7ZEKFVMGG@fairphone.com>
Date: Thu, 19 Sep 2024 09:00:46 +0200
From: "Luca Weiss" <luca.weiss@...rphone.com>
To: "Konrad Dybcio" <konradybcio@...nel.org>, "Bjorn Andersson"
 <andersson@...nel.org>, "Rob Herring" <robh@...nel.org>, "Krzysztof
 Kozlowski" <krzk+dt@...nel.org>, "Conor Dooley" <conor+dt@...nel.org>,
 <cros-qcom-dts-watchers@...omium.org>
Cc: "Marijn Suijten" <marijn.suijten@...ainline.org>,
 <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>, "Konrad Dybcio" <quic_kdybcio@...cinc.com>
Subject: Re: [RFC PATCH 00/11] Affirm SMMU coherent pagetable walker
 capability on RPMh SoCs

On Thu Sep 19, 2024 at 12:57 AM CEST, Konrad Dybcio wrote:
> I only read back the SMMU config on X1E & 7280, but I have it on good
> authority that this concerns all RPMh SoCs. Sending as RFC just in case.
>
> Lacking coherency can hurt performance, but claiming coherency where it's
> absent would lead to a kaboom.

Hi Konrad!

You want people with the affected SoCs to test this I imagine?

Just boot it and see if it doesn't implode, or do you have any more
elaborate test plan for this?

Regards
Luca

>
> Signed-off-by: Konrad Dybcio <quic_kdybcio@...cinc.com>
> ---
> Konrad Dybcio (11):
>       arm64: dts: qcom: qdu1000: Affirm IDR0.CCTW on apps_smmu
>       arm64: dts: qcom: sc7180: Affirm IDR0.CCTW on apps_smmu
>       arm64: dts: qcom: sc8180x: Affirm IDR0.CCTW on apps_smmu
>       arm64: dts: qcom: sc8280xp: Affirm IDR0.CCTW on apps_smmu
>       arm64: dts: qcom: sdm670: Affirm IDR0.CCTW on apps_smmu
>       arm64: dts: qcom: sdm845: Affirm IDR0.CCTW on apps_smmu
>       arm64: dts: qcom: sm6350: Affirm IDR0.CCTW on apps_smmu
>       arm64: dts: qcom: sm8150: Affirm IDR0.CCTW on apps_smmu
>       arm64: dts: qcom: sm8350: Affirm IDR0.CCTW on apps_smmu
>       arm64: dts: qcom: sm8450: Affirm IDR0.CCTW on apps_smmu
>       arm64: dts: qcom: x1e80100: Affirm IDR0.CCTW on apps_smmu
>
>  arch/arm64/boot/dts/qcom/qdu1000.dtsi  | 1 +
>  arch/arm64/boot/dts/qcom/sc7180.dtsi   | 1 +
>  arch/arm64/boot/dts/qcom/sc8180x.dtsi  | 2 +-
>  arch/arm64/boot/dts/qcom/sc8280xp.dtsi | 1 +
>  arch/arm64/boot/dts/qcom/sdm670.dtsi   | 1 +
>  arch/arm64/boot/dts/qcom/sdm845.dtsi   | 1 +
>  arch/arm64/boot/dts/qcom/sm6350.dtsi   | 1 +
>  arch/arm64/boot/dts/qcom/sm8150.dtsi   | 1 +
>  arch/arm64/boot/dts/qcom/sm8350.dtsi   | 1 +
>  arch/arm64/boot/dts/qcom/sm8450.dtsi   | 1 +
>  arch/arm64/boot/dts/qcom/x1e80100.dtsi | 2 ++
>  11 files changed, 12 insertions(+), 1 deletion(-)
> ---
> base-commit: 55bcd2e0d04c1171d382badef1def1fd04ef66c5
> change-id: 20240919-topic-apps_smmu_coherent-070f38a2c207
>
> Best regards,