linux-kernel - Re: [PATCH v2 3/3] arm64: dts: qcom: sm8450: Use GIC-ITS for PCIe0 and PCIe1

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Message-ID: <Y68IFveXH5yZVtzr@lpieralisi>
Date:   Fri, 30 Dec 2022 16:47:34 +0100
From:   Lorenzo Pieralisi <lpieralisi@...nel.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     andersson@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, bhelgaas@...gle.com,
        konrad.dybcio@...aro.org, linux-arm-msm@...r.kernel.org,
        linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] arm64: dts: qcom: sm8450: Use GIC-ITS for PCIe0
 and PCIe1

On Thu, Dec 22, 2022 at 07:01:23PM +0530, Manivannan Sadhasivam wrote:
> Both PCIe0 and PCIe1 controllers are capable of receiving MSIs from
> endpoint devices using GIC-ITS MSI controller. Add support for it.

Nit: the PCI controllers don't receive MSIs using the GIC-ITS MSI
controller, they signal MSIs interrupts using the GIC-ITS controller.

> 
> Currently, BDF (0:0.0) and BDF (1:0.0) are enabled and with the
> msi-map-mask of 0xff00, all the 32 devices under these two busses can
> share the same Device ID.
> 
> The GIC-ITS MSI implementation provides an advantage over internal MSI
> implementation using Locality-specific Peripheral Interrupts (LPI) that
> would allow MSIs to be targeted for each CPU core.
> 
> It should be noted that the MSIs for BDF (1:0.0) only works with Device
> ID of 0x5980 and 0x5a00. Hence, the IDs are swapped.
> 
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
>  arch/arm64/boot/dts/qcom/sm8450.dtsi | 20 ++++++++++++++------
>  1 file changed, 14 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm8450.dtsi b/arch/arm64/boot/dts/qcom/sm8450.dtsi
> index 570475040d95..c4dd5838fac6 100644
> --- a/arch/arm64/boot/dts/qcom/sm8450.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm8450.dtsi
> @@ -1733,9 +1733,13 @@ pcie0: pci@...0000 {
>  			ranges = <0x01000000 0x0 0x60200000 0 0x60200000 0x0 0x100000>,
>  				 <0x02000000 0x0 0x60300000 0 0x60300000 0x0 0x3d00000>;
>  
> -			interrupts = <GIC_SPI 141 IRQ_TYPE_LEVEL_HIGH>;
> -			interrupt-names = "msi";
> -			#interrupt-cells = <1>;
> +			/*
> +			 * MSIs for BDF (1:0.0) only works with Device ID 0x5980.
> +			 * Hence, the IDs are swapped.
> +			 */
> +			msi-map = <0x0 &gic_its 0x5981 0x1>,
> +				  <0x100 &gic_its 0x5980 0x1>;
> +			msi-map-mask = <0xff00>;
>  			interrupt-map-mask = <0 0 0 0x7>;
>  			interrupt-map = <0 0 0 1 &intc 0 0 0 149 IRQ_TYPE_LEVEL_HIGH>, /* int_a */
>  					<0 0 0 2 &intc 0 0 0 150 IRQ_TYPE_LEVEL_HIGH>, /* int_b */
> @@ -1842,9 +1846,13 @@ pcie1: pci@...8000 {
>  			ranges = <0x01000000 0x0 0x40200000 0 0x40200000 0x0 0x100000>,
>  				 <0x02000000 0x0 0x40300000 0 0x40300000 0x0 0x1fd00000>;
>  
> -			interrupts = <GIC_SPI 307 IRQ_TYPE_LEVEL_HIGH>;
> -			interrupt-names = "msi";
> -			#interrupt-cells = <1>;
> +			/*
> +			 * MSIs for BDF (1:0.0) only works with Device ID 0x5a00.
> +			 * Hence, the IDs are swapped.
> +			 */
> +			msi-map = <0x0 &gic_its 0x5a01 0x1>,
> +				  <0x100 &gic_its 0x5a00 0x1>;
> +			msi-map-mask = <0xff00>;
>  			interrupt-map-mask = <0 0 0 0x7>;
>  			interrupt-map = <0 0 0 1 &intc 0 0 0 434 IRQ_TYPE_LEVEL_HIGH>, /* int_a */
>  					<0 0 0 2 &intc 0 0 0 435 IRQ_TYPE_LEVEL_HIGH>, /* int_b */
> -- 
> 2.25.1
>