The TCUs (Translation Control Units) and TBUs (Translation Buffer Units) are key components of the ARM MMU-500. Multiple TBUs are connected to a single TCU over an interconnect. Each TBU contains a TLB that caches page tables. The MMU-500 implements a TBU for each connected master, and the TBU is designed, so that it is local to the master. The Qualcomm sdm845 platform has an implementation of the ARM SMMU-500, that consists of a single TCU and multiple TBUs. Support for the TCU is already present and this patchset is adds support for TBUs that allow us to use some of the debug features to include more info when a context fault occurs. Each TBU requires some resources like power-domains, interconnects and clocks to be described in DT. These resources will be being controlled by the TBU driver when they in use. Georgi Djakov (6): dt-bindings: iommu: Add Translation Buffer Unit bindings iommu/arm-smmu-qcom: Add support for TBUs iommu/arm-smmu-qcom: Add Qualcomm TBU driver iommu/arm-smmu: Allow using a threaded handler for context interrupts iommu/arm-smmu-qcom: Use a custom context fault handler for sdm845 arm64: dts: qcom: sdm845: Add DT nodes for the TBUs .../devicetree/bindings/iommu/arm,smmu.yaml | 13 + .../bindings/iommu/qcom,qsmmuv500-tbu.yaml | 67 +++ arch/arm64/boot/dts/qcom/sdm845.dtsi | 85 +++ drivers/iommu/Kconfig | 8 + drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 544 ++++++++++++++++++ drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h | 4 +- drivers/iommu/arm/arm-smmu/arm-smmu.c | 12 +- drivers/iommu/arm/arm-smmu/arm-smmu.h | 3 + 8 files changed, 733 insertions(+), 3 deletions(-) create mode 100644 Documentation/devicetree/bindings/iommu/qcom,qsmmuv500-tbu.yaml
