[PATCH v2 0/5] Convert riscv to use the generic iommu page table

[Jason Gunthorpe]

This is a fairly straightforward conversion of the RISC-V iommu driver to
use the now merged generic iommu page table code.

It brings support for SVNAPOT which is a 64K contiguous page. Otherwise it
should not change the behavior.

The series disables SADE as the dirty tracking support is not implemented
in the driver and should be done somewhat differently. The generic code
gets further along though this does not include the format implementation
of read and clear dirty.

The format implementation should be able to support the 32 bit option, but
this does not enable the iommu implementation as there seems to be no user
today.

It looks like RISCV could support the DYNAMIC_TOP option. It would require
some additional work on the core side to interact safely with SIGN_EXTEND.

This is on github: https://github.com/jgunthorpe/linux/commits/iommu_pt_riscv

v2:
 - Rebase to v6.19-rc1
 - Fix typo in PT_FEAT_RISCV_SVNAPOT_64K
v1: https://patch.msgid.link/r/0-v1-d3317b0ee398+50-iommu_pt_riscv_jgg@nvidia.com

Jason Gunthorpe (5):
  iommupt: Add the RISC-V page table format
  iommu/riscv: Disable SADE
  iommu/riscv: Use the generic iommu page table
  iommu/riscv: Enable SVNAPOT support for contiguous ptes
  iommu/riscv: Allow RISC_VIOMMU to COMPILE_TEST

 drivers/iommu/generic_pt/.kunitconfig        |   1 +
 drivers/iommu/generic_pt/Kconfig             |   9 +
 drivers/iommu/generic_pt/fmt/Makefile        |   2 +
 drivers/iommu/generic_pt/fmt/defs_riscv.h    |  29 ++
 drivers/iommu/generic_pt/fmt/iommu_riscv64.c |  11 +
 drivers/iommu/generic_pt/fmt/riscv.h         | 313 +++++++++++++++++++
 drivers/iommu/riscv/Kconfig                  |   8 +-
 drivers/iommu/riscv/iommu-bits.h             |   4 +-
 drivers/iommu/riscv/iommu.c                  | 302 +++---------------
 include/linux/generic_pt/common.h            |  16 +
 include/linux/generic_pt/iommu.h             |  11 +
 11 files changed, 445 insertions(+), 261 deletions(-)
 create mode 100644 drivers/iommu/generic_pt/fmt/defs_riscv.h
 create mode 100644 drivers/iommu/generic_pt/fmt/iommu_riscv64.c
 create mode 100644 drivers/iommu/generic_pt/fmt/riscv.h


base-commit: 9ace4753a5202b02191d54e9fdf7f9e3d02b85eb
-- 
2.43.0