linux-kernel - Re: [PATCH] arm64: dts: sm8650: Add msi-map-mask for PCIe nodes

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Date: Mon, 19 Feb 2024 10:59:20 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: sm8650: Add msi-map-mask for PCIe nodes

On 16/02/2024 18:05, Manivannan Sadhasivam wrote:
> "msi-map-mask" is a required property for all Qcom PCIe controllers as it
> would allow all PCIe devices under a bus to share the same MSI identifier.
> 
> Without this property, each device has to use a separate MSI identifier
> which is not possible due to platform limitations.
> 
> Currently, this is not an issue since only one device is connected to the
> bus on boards making use of this SoC.
> 
> Fixes: a33a532b3b1e ("arm64: dts: qcom: sm8650: Use GIC-ITS for PCIe0 and PCIe1")
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
>   arch/arm64/boot/dts/qcom/sm8650.dtsi | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm8650.dtsi b/arch/arm64/boot/dts/qcom/sm8650.dtsi
> index d488b3b3265e..12ba839f215e 100644
> --- a/arch/arm64/boot/dts/qcom/sm8650.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm8650.dtsi
> @@ -2277,6 +2277,7 @@ &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ALWAYS>,
>   			/* Entries are reversed due to the unusual ITS DeviceID encoding */
>   			msi-map = <0x0 &gic_its 0x1401 0x1>,
>   				  <0x100 &gic_its 0x1400 0x1>;
> +			msi-map-mask = <0xff00>;
>   
>   			linux,pci-domain = <0>;
>   			num-lanes = <2>;
> @@ -2404,6 +2405,7 @@ &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ALWAYS>,
>   			/* Entries are reversed due to the unusual ITS DeviceID encoding */
>   			msi-map = <0x0 &gic_its 0x1481 0x1>,
>   				  <0x100 &gic_its 0x1480 0x1>;
> +			msi-map-mask = <0xff00>;
>   
>   			linux,pci-domain = <1>;
>   			num-lanes = <2>;
> 
> ---
> base-commit: d37e1e4c52bc60578969f391fb81f947c3e83118
> change-id: 20240216-sm8550-msi-map-fix-ab8fe5e24df1
> 
> Best regards,

Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>