linux-kernel - [PATCH v3 00/14] iommu/amd: Add Generic IO Page Table Framework Support

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Date:   Sun,  4 Oct 2020 01:45:35 +0000
From:   Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To:     linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Cc:     joro@...tes.org, robin.murphy@....com,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Subject: [PATCH v3 00/14] iommu/amd: Add Generic IO Page Table Framework Support

The framework allows callable implementation of IO page table.
This allows AMD IOMMU driver to switch between different types
of AMD IOMMU page tables (e.g. v1 vs. v2).

This series refactors the current implementation of AMD IOMMU v1 page table
to adopt the framework. There should be no functional change.
Subsequent series will introduce support for the AMD IOMMU v2 page table.

Thanks,
Suravee

Change from V2 (https://lore.kernel.org/lkml/835c0d46-ed96-9fbe-856a-777dcffac967@amd.com/T/#t)
  - Patch 2/14: Introduce helper function io_pgtable_cfg_to_data.
  - Patch 13/14: Put back the struct iommu_flush_ops since patch v2 would run into
    NULL pointer bug when calling free_io_pgtable_ops if not defined.

Change from V1 (https://lkml.org/lkml/2020/9/23/251)
  - Do not specify struct io_pgtable_cfg.coherent_walk, since it is
    not currently used. (per Robin)
  - Remove unused struct iommu_flush_ops.  (patch 2/13)
  - Move amd_iommu_setup_io_pgtable_ops to iommu.c instead of io_pgtable.c
    patch 13/13)

Suravee Suthikulpanit (14):
  iommu/amd: Re-define amd_iommu_domain_encode_pgtable as inline
  iommu/amd: Prepare for generic IO page table framework
  iommu/amd: Move pt_root to to struct amd_io_pgtable
  iommu/amd: Convert to using amd_io_pgtable
  iommu/amd: Declare functions as extern
  iommu/amd: Move IO page table related functions
  iommu/amd: Restructure code for freeing page table
  iommu/amd: Remove amd_iommu_domain_get_pgtable
  iommu/amd: Rename variables to be consistent with struct
    io_pgtable_ops
  iommu/amd: Refactor fetch_pte to use struct amd_io_pgtable
  iommu/amd: Introduce iommu_v1_iova_to_phys
  iommu/amd: Introduce iommu_v1_map_page and iommu_v1_unmap_page
  iommu/amd: Introduce IOMMU flush callbacks
  iommu/amd: Adopt IO page table framework

 drivers/iommu/amd/Kconfig           |   1 +
 drivers/iommu/amd/Makefile          |   2 +-
 drivers/iommu/amd/amd_iommu.h       |  22 +
 drivers/iommu/amd/amd_iommu_types.h |  43 +-
 drivers/iommu/amd/io_pgtable.c      | 564 ++++++++++++++++++++++++
 drivers/iommu/amd/iommu.c           | 646 +++-------------------------
 drivers/iommu/io-pgtable.c          |   3 +
 include/linux/io-pgtable.h          |   2 +
 8 files changed, 691 insertions(+), 592 deletions(-)
 create mode 100644 drivers/iommu/amd/io_pgtable.c

-- 
2.17.1