Another refresh to support split pagetables for Adreno GPUs as part of an incremental process to enable per-context pagetables.
In order to support per-context pagetables the GPU needs to enable split tables so that we can store global buffers in the TTBR1 space leaving the GPU free to program the TTBR0 register with the address of a context specific pagetable.
This patchset adds split pagetable support for devices identified with the compatible string qcom,adreno-smmu-v2. If the compatible string is enabled and DOMAIN_ATTR_SPLIT_TABLES is non zero at attach time, the implementation will set up the TTBR0 and TTBR1 spaces with identical configurations and program the domain pagetable into the TTBR1 register. The TTBR0 register will be unused.
The driver can determine if split pagetables were programmed by querying DOMAIN_ATTR_SPLIT_TABLES after attaching. The domain geometry will also be updated to reflect the virtual address space for the TTBR1 range.
These patches are on based on top of linux-next-20191120 with [1], [2], and [3] from Robin on the iommu list.
The first four patches add the device tree bindings and implementation specific support for arm-smmu and the rest of the patches add the drm/msm implementation followed by the device tree update for sdm845.
[1] https://lists.linuxfoundation.org/pipermail/iommu/2019-October/039718.html [2] https://lists.linuxfoundation.org/pipermail/iommu/2019-October/039719.html [3] https://lists.linuxfoundation.org/pipermail/iommu/2019-October/039720.html
Jordan Crouse (8): dt-bindings: arm-smmu: Add Adreno GPU variant iommu: Add DOMAIN_ATTR_SPLIT_TABLES iommu/arm-smmu: Pass io_pgtable_cfg to impl specific init_context iommu/arm-smmu: Add split pagetables for Adreno IOMMU implementations drm/msm: Attach the IOMMU device during initialization drm/msm: Refactor address space initialization drm/msm/a6xx: Support split pagetables arm64: dts: qcom: sdm845: Update Adreno GPU SMMU compatible string
.../devicetree/bindings/iommu/arm,smmu.yaml | 6 ++ arch/arm64/boot/dts/qcom/sdm845.dtsi | 2 +- drivers/gpu/drm/msm/adreno/a2xx_gpu.c | 16 ++++ drivers/gpu/drm/msm/adreno/a3xx_gpu.c | 1 + drivers/gpu/drm/msm/adreno/a4xx_gpu.c | 1 + drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 1 + drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 45 ++++++++++ drivers/gpu/drm/msm/adreno/adreno_gpu.c | 23 ++++-- drivers/gpu/drm/msm/adreno/adreno_gpu.h | 8 ++ drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 18 ++-- drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c | 18 ++-- drivers/gpu/drm/msm/disp/mdp5/mdp5_cfg.c | 4 - drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c | 18 ++-- drivers/gpu/drm/msm/msm_drv.h | 8 +- drivers/gpu/drm/msm/msm_gem_vma.c | 37 ++------- drivers/gpu/drm/msm/msm_gpu.c | 49 +---------- drivers/gpu/drm/msm/msm_gpu.h | 4 +- drivers/gpu/drm/msm/msm_gpummu.c | 6 -- drivers/gpu/drm/msm/msm_iommu.c | 18 ++-- drivers/gpu/drm/msm/msm_mmu.h | 1 - drivers/iommu/arm-smmu-impl.c | 6 +- drivers/iommu/arm-smmu-qcom.c | 96 ++++++++++++++++++++++ drivers/iommu/arm-smmu.c | 52 +++++++++--- drivers/iommu/arm-smmu.h | 14 +++- include/linux/iommu.h | 1 + 25 files changed, 295 insertions(+), 158 deletions(-)