linux-kernel - Re: [PATCH] arm64: dts: qcom: sm8650: Use GIC-ITS for PCIe0 and PCIe1

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Date: Thu, 1 Feb 2024 20:59:22 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Neil Armstrong <neil.armstrong@...aro.org>,
 Bjorn Andersson <andersson@...nel.org>, Rob Herring <robh+dt@...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: qcom: sm8650: Use GIC-ITS for PCIe0 and PCIe1

On 25.01.2024 17:55, Neil Armstrong wrote:
> Both PCIe0 and PCIe1 controllers are capable of signalling the MSIs
> received from endpoint devices to the CPU using GIC-ITS MSI controller.
> Add support for it.
> 
> 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.
> 
> Like SM8450 & SM8550, the IDs are swapped, but works fine on PCIe0 and PCIe1.
> 
> WiFi PCIe Device on SM8650-QRD using GIC-ITS:
> 159:          0          0          0          0          0          0          0          0   ITS-MSI   0 Edge      PCIe PME, aerdrv
> 167:          0          4          0          0          0          0          0          0   ITS-MSI 524288 Edge      bhi
> 168:          0          0          4          0          0          0          0          0   ITS-MSI 524289 Edge      mhi
> 169:          0          0          0         34          0          0          0          0   ITS-MSI 524290 Edge      mhi
> 170:          0          0          0          0          3          0          0          0   ITS-MSI 524291 Edge      ce0
> 171:          0          0          0          0          0          2          0          0   ITS-MSI 524292 Edge      ce1
> 172:          0          0          0          0          0          0        806          0   ITS-MSI 524293 Edge      ce2
> 173:          0          0          0          0          0          0          0         76   ITS-MSI 524294 Edge      ce3
> 174:          0          0          0          0          0          0          0          0   ITS-MSI 524295 Edge      ce5
> 175:          0         13          0          0          0          0          0          0   ITS-MSI 524296 Edge      DP_EXT_IRQ
> 176:          0          0          0          0          0          0          0          0   ITS-MSI 524297 Edge      DP_EXT_IRQ

Is it by chance that this one never fired?

(lgtm otherwise)

Konrad