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Date: Wed, 15 Mar 2023 19:31:55 -0700
From: Bjorn Andersson <andersson@...nel.org>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
konrad.dybcio@...aro.org, linux-arm-msm@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
Rob Herring <robh@...nel.org>
Subject: Re: [PATCH] arm64: dts: qcom: Remove "iommus" property from PCIe
nodes
On Wed, Mar 08, 2023 at 01:26:48PM +0530, Manivannan Sadhasivam wrote:
> Currently, most of the Qualcomm SoCs specify both "iommus" and "iommu-map"
> properties for the PCIe nodes. First one passes the SMR mask to the iommu
> driver and the latter specifies the SID for each PCIe device.
>
> But with "iommus" property, the PCIe controller will be added to the
> iommu group along with the devices. This makes no sense because the
> controller will not initiate any DMA transaction on its own. And moreover,
> it is not strictly required to pass the SMR mask to the iommu driver. If
> the "iommus" property is not present, then the default mask of "0" would be
> used which should work for all PCIe devices.
>
> On the other side, if the SMR mask specified doesn't match the one expected
> by the hypervisor, then all the PCIe transactions will end up triggering
> "Unidentified Stream Fault" by the SMMU.
>
> So to get rid of these hassles and also prohibit PCIe controllers from
> adding to the iommu group, let's remove the "iommus" property from PCIe
> nodes.
>
> Reported-by: Rob Herring <robh@...nel.org>
> Link: https://lore.kernel.org/linux-arm-msm/20230227195535.GA749409-robh@kernel.org
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Reviewed-by: Bjorn Andersson <andersson@...nel.org>
> ---
> arch/arm64/boot/dts/qcom/sc7280.dtsi | 2 --
> arch/arm64/boot/dts/qcom/sdm845.dtsi | 2 --
> arch/arm64/boot/dts/qcom/sm8150.dtsi | 2 --
> arch/arm64/boot/dts/qcom/sm8250.dtsi | 3 ---
> arch/arm64/boot/dts/qcom/sm8350.dtsi | 2 --
> arch/arm64/boot/dts/qcom/sm8450.dtsi | 2 --
> arch/arm64/boot/dts/qcom/sm8550.dtsi | 2 --
> 7 files changed, 15 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> index 8f4ab6bd2886..9f7269029a02 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> @@ -2133,8 +2133,6 @@ pcie1: pci@...8000 {
>
> dma-coherent;
>
> - iommus = <&apps_smmu 0x1c80 0x1>;
> -
> iommu-map = <0x0 &apps_smmu 0x1c80 0x1>,
> <0x100 &apps_smmu 0x1c81 0x1>;
>
> diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> index 479859bd8ab3..5f110b0062d9 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> @@ -2319,7 +2319,6 @@ pcie0: pci@...0000 {
> "slave_q2a",
> "tbu";
>
> - iommus = <&apps_smmu 0x1c10 0xf>;
> iommu-map = <0x0 &apps_smmu 0x1c10 0x1>,
> <0x100 &apps_smmu 0x1c11 0x1>,
> <0x200 &apps_smmu 0x1c12 0x1>,
> @@ -2429,7 +2428,6 @@ pcie1: pci@...8000 {
> assigned-clocks = <&gcc GCC_PCIE_1_AUX_CLK>;
> assigned-clock-rates = <19200000>;
>
> - iommus = <&apps_smmu 0x1c00 0xf>;
> iommu-map = <0x0 &apps_smmu 0x1c00 0x1>,
> <0x100 &apps_smmu 0x1c01 0x1>,
> <0x200 &apps_smmu 0x1c02 0x1>,
> diff --git a/arch/arm64/boot/dts/qcom/sm8150.dtsi b/arch/arm64/boot/dts/qcom/sm8150.dtsi
> index 13e0ce828606..6a383e918329 100644
> --- a/arch/arm64/boot/dts/qcom/sm8150.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm8150.dtsi
> @@ -1826,7 +1826,6 @@ pcie0: pci@...0000 {
> "slave_q2a",
> "tbu";
>
> - iommus = <&apps_smmu 0x1d80 0x3f>;
> iommu-map = <0x0 &apps_smmu 0x1d80 0x1>,
> <0x100 &apps_smmu 0x1d81 0x1>;
>
> @@ -1925,7 +1924,6 @@ pcie1: pci@...8000 {
> assigned-clocks = <&gcc GCC_PCIE_1_AUX_CLK>;
> assigned-clock-rates = <19200000>;
>
> - iommus = <&apps_smmu 0x1e00 0x3f>;
> iommu-map = <0x0 &apps_smmu 0x1e00 0x1>,
> <0x100 &apps_smmu 0x1e01 0x1>;
>
> diff --git a/arch/arm64/boot/dts/qcom/sm8250.dtsi b/arch/arm64/boot/dts/qcom/sm8250.dtsi
> index 2f0e460acccd..c7682fda9d8c 100644
> --- a/arch/arm64/boot/dts/qcom/sm8250.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm8250.dtsi
> @@ -1871,7 +1871,6 @@ pcie0: pci@...0000 {
> "tbu",
> "ddrss_sf_tbu";
>
> - iommus = <&apps_smmu 0x1c00 0x7f>;
> iommu-map = <0x0 &apps_smmu 0x1c00 0x1>,
> <0x100 &apps_smmu 0x1c01 0x1>;
>
> @@ -1977,7 +1976,6 @@ pcie1: pci@...8000 {
> assigned-clocks = <&gcc GCC_PCIE_1_AUX_CLK>;
> assigned-clock-rates = <19200000>;
>
> - iommus = <&apps_smmu 0x1c80 0x7f>;
> iommu-map = <0x0 &apps_smmu 0x1c80 0x1>,
> <0x100 &apps_smmu 0x1c81 0x1>;
>
> @@ -2085,7 +2083,6 @@ pcie2: pci@...0000 {
> assigned-clocks = <&gcc GCC_PCIE_2_AUX_CLK>;
> assigned-clock-rates = <19200000>;
>
> - iommus = <&apps_smmu 0x1d00 0x7f>;
> iommu-map = <0x0 &apps_smmu 0x1d00 0x1>,
> <0x100 &apps_smmu 0x1d01 0x1>;
>
> diff --git a/arch/arm64/boot/dts/qcom/sm8350.dtsi b/arch/arm64/boot/dts/qcom/sm8350.dtsi
> index 1c97e28da6ad..365b9d773b5c 100644
> --- a/arch/arm64/boot/dts/qcom/sm8350.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm8350.dtsi
> @@ -1526,7 +1526,6 @@ pcie0: pci@...0000 {
> "aggre1",
> "aggre0";
>
> - iommus = <&apps_smmu 0x1c00 0x7f>;
> iommu-map = <0x0 &apps_smmu 0x1c00 0x1>,
> <0x100 &apps_smmu 0x1c01 0x1>;
>
> @@ -1610,7 +1609,6 @@ pcie1: pci@...8000 {
> "ddrss_sf_tbu",
> "aggre1";
>
> - iommus = <&apps_smmu 0x1c80 0x7f>;
> iommu-map = <0x0 &apps_smmu 0x1c80 0x1>,
> <0x100 &apps_smmu 0x1c81 0x1>;
>
> diff --git a/arch/arm64/boot/dts/qcom/sm8450.dtsi b/arch/arm64/boot/dts/qcom/sm8450.dtsi
> index 1a744a33bcf4..e3201b1b07a5 100644
> --- a/arch/arm64/boot/dts/qcom/sm8450.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm8450.dtsi
> @@ -1790,7 +1790,6 @@ pcie0: pci@...0000 {
> "aggre0",
> "aggre1";
>
> - iommus = <&apps_smmu 0x1c00 0x7f>;
> iommu-map = <0x0 &apps_smmu 0x1c00 0x1>,
> <0x100 &apps_smmu 0x1c01 0x1>;
>
> @@ -1904,7 +1903,6 @@ pcie1: pci@...8000 {
> "ddrss_sf_tbu",
> "aggre1";
>
> - iommus = <&apps_smmu 0x1c80 0x7f>;
> iommu-map = <0x0 &apps_smmu 0x1c80 0x1>,
> <0x100 &apps_smmu 0x1c81 0x1>;
>
> diff --git a/arch/arm64/boot/dts/qcom/sm8550.dtsi b/arch/arm64/boot/dts/qcom/sm8550.dtsi
> index 25f51245fe9b..6edb3acb91ef 100644
> --- a/arch/arm64/boot/dts/qcom/sm8550.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm8550.dtsi
> @@ -1692,7 +1692,6 @@ pcie0: pci@...0000 {
> interconnect-names = "pcie-mem";
> interconnects = <&pcie_noc MASTER_PCIE_0 0 &mc_virt SLAVE_EBI1 0>;
>
> - iommus = <&apps_smmu 0x1400 0x7f>;
> iommu-map = <0x0 &apps_smmu 0x1400 0x1>,
> <0x100 &apps_smmu 0x1401 0x1>;
>
> @@ -1796,7 +1795,6 @@ pcie1: pci@...8000 {
> interconnect-names = "pcie-mem";
> interconnects = <&pcie_noc MASTER_PCIE_1 0 &mc_virt SLAVE_EBI1 0>;
>
> - iommus = <&apps_smmu 0x1480 0x7f>;
> iommu-map = <0x0 &apps_smmu 0x1480 0x1>,
> <0x100 &apps_smmu 0x1481 0x1>;
>
> --
> 2.25.1
>
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