[PATCH v2 0/8] Support non-leaf and range invalidation features in RISC-V

[Jason Gunthorpe]

This is part of the patch pile to get SMMUv3 moved to iommupt. From
that perspective it introduces the PT_FEAT_DETAILED_GATHER which will
be used by both RISC-V and SMMUv3 to generate optimized invalidation
commands.

I don't have any RISC-V anything so this needs to be tested by someone who
does.

Improve the invalidation flow in RISC-V:
 - For single address invalidation, compute a stride based on what
   IOPTEs were changed by having the gather track level changes in
   bitmaps. This allows things like unmapping hugetlb-backed mappings
   to avoid jumping to global invalidation.

 - Support the NL bit to avoid global invalidation when table
   structure is changed

 - Support the S range invalidation feature to convert any gather
   into a single invalidation command using an aligned power-of-2
   size like AMD and VT-d.

This is also a requirement for the kunit iotlb series, which was used
to test the math used to generate the invalidation commands from the
gather in this series.

It replaces a similar series Fangyu sent prior to the iommupt
conversion:

https://lore.kernel.org/linux-iommu/20260208144213.94856-1-fangyu.yu@linux.alibaba.com/

The full patch pile is here:

https://github.com/jgunthorpe/linux/commits/iommu_pt_arm64/

v2:
 - Add a patch to add the dword number to the CMD macros
 - Correct the IOTINVAL_S position to be in dword 1
v1: https://lore.kernel.org/all/0-v1-54e7264d71b4+17cc3-iommu_riscv_inv_jgg@nvidia.com/

Jason Gunthorpe (8):
  iommu: Split the kdoc comment for struct iommu_iotlb_gather
  iommupt: Add struct iommupt_pending_gather
  iommupt: Add PT_FEAT_DETAILED_GATHER
  iommu/riscv: Enable PT_FEAT_DETAILED_GATHER and pass gather to
    iotlb_inval
  iommu/riscv: Compute best stride for single invalidation
  iommu/riscv: Add RISCV_IOMMU_CAPABILITIES_NL
  iommu/riscv: Include the dword number in RISCV_IOMMU_CMD macros
  iommu/riscv: Add NAPOT range invalidation support

 drivers/iommu/generic_pt/fmt/iommu_riscv64.c |   4 +-
 drivers/iommu/generic_pt/iommu_pt.h          |  98 ++++++++----
 drivers/iommu/riscv/iommu-bits.h             | 123 ++++++++------
 drivers/iommu/riscv/iommu.c                  | 160 ++++++++++++++-----
 include/linux/generic_pt/common.h            |   5 +
 include/linux/iommu.h                        |  42 ++++-
 6 files changed, 309 insertions(+), 123 deletions(-)


base-commit: 83ff8144b661ec00d997d78a43987f974cc5792a
-- 
2.43.0