linux-kernel - Re: [PATCH] arm64: dts: qcom: sm8150: Fix the iommu mask used for PCIe controllers

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Date:   Fri, 24 Feb 2023 13:32:45 +0530
From:   Bhupesh Sharma <bhupesh.sharma@...aro.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     andersson@...nel.org, konrad.dybcio@...aro.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        srinivas.kandagatla@...aro.org, quic_vkamble@...cinc.com,
        stable@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: sm8150: Fix the iommu mask used for
 PCIe controllers

On Fri, 24 Feb 2023 at 13:30, Manivannan Sadhasivam
<manivannan.sadhasivam@...aro.org> wrote:
>
> The iommu mask should be 0x3f as per Qualcomm internal documentation.
> Without the correct mask, the PCIe transactions from the endpoint will
> result in SMMU faults. Hence, fix it!
>
> Cc: stable@...r.kernel.org # 5.19
> Fixes: a1c86c680533 ("arm64: dts: qcom: sm8150: Add PCIe nodes")
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
>  arch/arm64/boot/dts/qcom/sm8150.dtsi | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/qcom/sm8150.dtsi b/arch/arm64/boot/dts/qcom/sm8150.dtsi
> index fd20096cfc6e..13e0ce828606 100644
> --- a/arch/arm64/boot/dts/qcom/sm8150.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm8150.dtsi
> @@ -1826,7 +1826,7 @@ pcie0: pci@...0000 {
>                                       "slave_q2a",
>                                       "tbu";
>
> -                       iommus = <&apps_smmu 0x1d80 0x7f>;
> +                       iommus = <&apps_smmu 0x1d80 0x3f>;
>                         iommu-map = <0x0   &apps_smmu 0x1d80 0x1>,
>                                     <0x100 &apps_smmu 0x1d81 0x1>;
>
> @@ -1925,7 +1925,7 @@ pcie1: pci@...8000 {
>                         assigned-clocks = <&gcc GCC_PCIE_1_AUX_CLK>;
>                         assigned-clock-rates = <19200000>;
>
> -                       iommus = <&apps_smmu 0x1e00 0x7f>;
> +                       iommus = <&apps_smmu 0x1e00 0x3f>;
>                         iommu-map = <0x0   &apps_smmu 0x1e00 0x1>,
>                                     <0x100 &apps_smmu 0x1e01 0x1>;
>

Reviewed-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>

Thanks.