From: Konrad Dybcio <konrad.dybcio@linaro.org> To: Bjorn Andersson <andersson@kernel.org>, Rob Herring <robh+dt@kernel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>, Conor Dooley <conor+dt@kernel.org>, Will Deacon <will@kernel.org>, Robin Murphy <robin.murphy@arm.com>, Joerg Roedel <joro@8bytes.org>, Rob Herring <robh@kernel.org> Cc: Marijn Suijten <marijn.suijten@somainline.org>, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev, Johan Hovold <johan+linaro@kernel.org>, Konrad Dybcio <konrad.dybcio@linaro.org> Subject: [PATCH v2 2/2] arm64: dts: qcom: sc8280xp: Describe the PCIe SMMUv3 Date: Sat, 09 Mar 2024 14:31:10 +0100 [thread overview] Message-ID: <20231219-topic-8280_smmuv3-v2-2-c67bd3226687@linaro.org> (raw) In-Reply-To: <20231219-topic-8280_smmuv3-v2-0-c67bd3226687@linaro.org> SC8280XP actually has a third SMMU, which can be seen in e.g. the IORT ACPI table and is used for the PCIe hosts. Unfortunately though, the secure firmware seems to be configured in a way such that Linux can't touch it, not even read back the ID registers. It also seems like the SMMU is configured to run in some sort of bypass mode, completely opaque to the OS. Describe it so that one can configure it when running Linux as a hypervisor (e.g with [1]) and for hardware description completeness. [1] https://github.com/TravMurav/slbounce Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org> --- arch/arm64/boot/dts/qcom/sc8280xp.dtsi | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi index a5b194813079..28edd30a9c04 100644 --- a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi +++ b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi @@ -4648,6 +4648,22 @@ cci3_i2c1_sleep: cci3-i2c1-sleep-pins { }; }; + pcie_smmu: iommu@14f80000 { + compatible = "qcom,sc8280xp-smmu-v3", "arm,smmu-v3"; + reg = <0 0x14f80000 0 0x80000>; + interrupts = <GIC_SPI 951 IRQ_TYPE_EDGE_RISING>, + <GIC_SPI 955 IRQ_TYPE_EDGE_RISING>, + <GIC_SPI 953 IRQ_TYPE_EDGE_RISING>; + interrupt-names = "eventq", + "gerror", + "cmdq-sync"; + #iommu-cells = <1>; + dma-coherent; + + /* The hypervisor prevents register access from Linux */ + status = "reserved"; + }; + apps_smmu: iommu@15000000 { compatible = "qcom,sc8280xp-smmu-500", "arm,mmu-500"; reg = <0 0x15000000 0 0x100000>; -- 2.44.0
WARNING: multiple messages have this Message-ID (diff)
From: Konrad Dybcio <konrad.dybcio@linaro.org> To: Bjorn Andersson <andersson@kernel.org>, Rob Herring <robh+dt@kernel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>, Conor Dooley <conor+dt@kernel.org>, Will Deacon <will@kernel.org>, Robin Murphy <robin.murphy@arm.com>, Joerg Roedel <joro@8bytes.org>, Rob Herring <robh@kernel.org> Cc: Marijn Suijten <marijn.suijten@somainline.org>, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev, Johan Hovold <johan+linaro@kernel.org>, Konrad Dybcio <konrad.dybcio@linaro.org> Subject: [PATCH v2 2/2] arm64: dts: qcom: sc8280xp: Describe the PCIe SMMUv3 Date: Sat, 09 Mar 2024 14:31:10 +0100 [thread overview] Message-ID: <20231219-topic-8280_smmuv3-v2-2-c67bd3226687@linaro.org> (raw) In-Reply-To: <20231219-topic-8280_smmuv3-v2-0-c67bd3226687@linaro.org> SC8280XP actually has a third SMMU, which can be seen in e.g. the IORT ACPI table and is used for the PCIe hosts. Unfortunately though, the secure firmware seems to be configured in a way such that Linux can't touch it, not even read back the ID registers. It also seems like the SMMU is configured to run in some sort of bypass mode, completely opaque to the OS. Describe it so that one can configure it when running Linux as a hypervisor (e.g with [1]) and for hardware description completeness. [1] https://github.com/TravMurav/slbounce Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org> --- arch/arm64/boot/dts/qcom/sc8280xp.dtsi | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi index a5b194813079..28edd30a9c04 100644 --- a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi +++ b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi @@ -4648,6 +4648,22 @@ cci3_i2c1_sleep: cci3-i2c1-sleep-pins { }; }; + pcie_smmu: iommu@14f80000 { + compatible = "qcom,sc8280xp-smmu-v3", "arm,smmu-v3"; + reg = <0 0x14f80000 0 0x80000>; + interrupts = <GIC_SPI 951 IRQ_TYPE_EDGE_RISING>, + <GIC_SPI 955 IRQ_TYPE_EDGE_RISING>, + <GIC_SPI 953 IRQ_TYPE_EDGE_RISING>; + interrupt-names = "eventq", + "gerror", + "cmdq-sync"; + #iommu-cells = <1>; + dma-coherent; + + /* The hypervisor prevents register access from Linux */ + status = "reserved"; + }; + apps_smmu: iommu@15000000 { compatible = "qcom,sc8280xp-smmu-500", "arm,mmu-500"; reg = <0 0x15000000 0 0x100000>; -- 2.44.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2024-03-09 13:31 UTC|newest] Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top 2024-03-09 13:31 [PATCH v2 0/2] Describe SC8280XP PCIe SMMU Konrad Dybcio 2024-03-09 13:31 ` Konrad Dybcio 2024-03-09 13:31 ` [PATCH v2 1/2] dt-bindings: iommu: arm,smmu-v3: Add SC8280XP compatible Konrad Dybcio 2024-03-09 13:31 ` Konrad Dybcio 2024-03-10 8:46 ` Krzysztof Kozlowski 2024-03-10 8:46 ` Krzysztof Kozlowski 2024-03-19 13:53 ` Robin Murphy 2024-03-19 13:53 ` Robin Murphy 2024-03-27 19:23 ` Konrad Dybcio 2024-03-27 19:23 ` Konrad Dybcio 2024-03-09 13:31 ` Konrad Dybcio [this message] 2024-03-09 13:31 ` [PATCH v2 2/2] arm64: dts: qcom: sc8280xp: Describe the PCIe SMMUv3 Konrad Dybcio 2024-03-18 1:31 ` Bjorn Andersson 2024-03-18 1:31 ` Bjorn Andersson 2024-03-18 9:21 ` Konrad Dybcio 2024-03-18 9:21 ` Konrad Dybcio
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