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

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Date:   Thu, 22 Dec 2022 19:01:23 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     andersson@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org
Cc:     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,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH v2 3/3] arm64: dts: qcom: sm8450: Use GIC-ITS for PCIe0 and PCIe1

Both PCIe0 and PCIe1 controllers are capable of receiving MSIs from
endpoint devices using GIC-ITS MSI controller. Add support for it.

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