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@xxxxxxxxxx> > Link: https://lore.kernel.org/linux-arm-msm/20230227195535.GA749409-robh@xxxxxxxxxx > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx> Reviewed-by: Bjorn Andersson <andersson@xxxxxxxxxx> > --- > 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@1c08000 { > > 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@1c00000 { > "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@1c08000 { > 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@1c00000 { > "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@1c08000 { > 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@1c00000 { > "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@1c08000 { > 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@1c10000 { > 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@1c00000 { > "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@1c08000 { > "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@1c00000 { > "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@1c08000 { > "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@1c00000 { > 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@1c08000 { > 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 >
