On 9/7/26 11:12 PM, Mario Limonciello wrote:
Add support for the AMD IOMMU Performance Optimization (PerfOpt) feature as defined in the AMD I/O Virtualization Technology (IOMMU) Specification, Section 3.4.9 (MMIO Offset 016Ch).This feature allows privileged integrated I/O devices (GPUs) to bypass the IOMMU when directly accessing system memory. The IOMMU only enforces the IR/IW permission bits without GPA->SPA translations. Drivers will opt into this behavior, and enable amdgpu to turn this feature on when an integrated GPU is already in identity mode. If a user prefers to keep it always off (even with identity mode) there is also a module parameter to force it off. v2: * Rebase on 7.3-rc2 * Adjust amdgpu parameter behavior Mario Limonciello (2): iommu/amd: Add PerfOpt IOMMU performance optimization support drm/amdgpu: Enable PerfOpt IOMMU perf optimization when GPU in identity domain drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1 + drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 50 +++++ drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 12 ++ drivers/iommu/amd/amd_iommu.h | 3 + drivers/iommu/amd/amd_iommu_types.h | 7 + drivers/iommu/amd/init.c | 43 +++++ drivers/iommu/amd/iommu.c | 214 +++++++++++++++++++++ include/linux/amd-iommu.h | 11 ++ 8 files changed, 341 insertions(+)
Alex, Vasant, Joerg, Gentle ping on this series. Thanks,
