[PATCH v7 00/17] iommu/amd: SVA Support (part 3) - refactor support for GCR3 table

[Vasant Hegde <vasant.hegde@amd.com>]

This is part 3 of the 4-part series to introduce Share Virtual
Address (SVA) support, which focuses on refactoring GCR3 table.
This moves GCR3 related information from protection domain
structure to iommu_dev_data (per device) structure.

It contains the following enhancements:

* Patch 1 - 3:
  Cleanup and introduce helper function

* Patch 4 - 13:
  Introduce per device GCR3 table, invalidation based on per device and
  code refactoring. Also introduce iommu_group_mutex_assert.

* Patch 14 - 16:
  Remove unused variable, rearrange functions to make it easy to maintain

* Patch 17:
  Introduce per device domain ID.

This patch series is based on top of iommu/next branch (commit d2d00e15808).

This is also available at github :
  https://github.com/AMDESE/linux/tree/iommu_sva_part3_v7_v6.8_rc2

Thanks Jason for reviewing previous versions and providing valuable feedbacks.

Changes from v6 -> v7:
  - Added Reviewed-by tags
  - Rebased on top of iommu/next branch
  - iommu: Introduce iommu_group_mutex_assert()
    Removed 'extern' from iommu_group_mutex_assert() declaration
  - iommu/amd: Refactor helper function for setting / clearing GCR3
    Followed-success oriented flow
  - Minor update to patch 11/17 description

v6: https://lore.kernel.org/linux-iommu/20240125121135.8217-1-vasant.hegde@amd.com/T/#t

Changes from v5 -> v6:
  - Moved per-device-domain-ID patch to end
  - Added condition check for iommu_group_mutex_assert()
  - Moving per-device-domain-id allocation/free to setup_gcr3_table()/free_gcr3_table
  - Pass iommu to setup_gcr3_table instead of passing nid

v5: https://lore.kernel.org/linux-iommu/20240116165335.6043-1-vasant.hegde@amd.com/T/#t

Changes from v4 -> v5:
  - Added get_amd_iommu_from_dev_data()
  - pass gcr3_info instead of dev_data to setup/free_gcr3_table()
  - Added path to EXPORT iommu_group_mutex_assert
  - Moved dev_data->domid to gcr3_info->domid


v4: https://lore.kernel.org/linux-iommu/20231212085224.6985-1-vasant.hegde@amd.com/T/#t

Changes from v3 -> v4:
  - Added new patch to enable IOMMU GT feature early
  - Fixed dirty tracking path to use get_amd_iommu_from_dev()
  - Fixed duplicate flush issue in do_attach() path
  - Removed gcr3_info->giov variable. Instead we use domain page table mode to decide
    DTE[GIOV] bit.
  - Free gcr3_table before calling set_dte_entry (otherwise there is a possibility
    of its setting up gcr3 table with glx 0)
  - Adjusted gfp_t flag for GCR3 table allocation (GPF_ATOMIC -> GFP_KERNEL)
  - Moved below patches from invalidation improvement series to this series
    * Remove unused flush_pasid() related functions
      (Originally it was part of Invalidation improvement series, I had to push it to
       this series as set_gcr3() was still using __amd_iommu_flush_tlb()).
    * Added patch to Rearrange device flush code

v3 : https://lore.kernel.org/linux-iommu/20231013151652.6008-1-vasant.hegde@amd.com/T/#t

Changes from v2 -> v3:
  - Dropped "iommu/amd: Use struct protection_domain in helper functions" as flush related
    functions are already fixed and set_gcr3 related functions is reworked in this series.
  - Removed moving to_pdomain() function from this series. It will be introduced
    in SVA series where it will be used.
  - Added per device domain ID and per device invalidation functions
  - Added functions to flush TLB for the given device
  - Added Review-by tags

v2 : https://lore.kernel.org/linux-iommu/20230816174031.634453-1-vasant.hegde@amd.com/T/#t

Changes from v1 - v2:
  - Dropped iommu_v2 module related support as newly introduced Part2
    removed iommu_v2 module.
  - Moved Patch 'Use struct protection_domain in helper functions' from Part1 to
    Part3
  - Updated get_amd_iommu_from_dev() to retrieve iommu from device structure
  - Removed 'PD_MODE_PT'

v1 : https://lore.kernel.org/linux-iommu/20230808100232.5977-1-vasant.hegde@amd.com/T/#t

Thank you,
Vasant / Suravee

Suravee Suthikulpanit (8):
  iommu/amd: Introduce get_amd_iommu_from_dev()
  iommu/amd: Introduce struct protection_domain.pd_mode
  iommu/amd: Introduce per-device GCR3 table
  iommu/amd: Refactor helper function for setting / clearing GCR3
  iommu/amd: Refactor attaching / detaching device functions
  iommu/amd: Refactor protection_domain helper functions
  iommu/amd: Refactor GCR3 table helper functions
  iommu/amd: Remove unused GCR3 table parameters from struct protection_domain

Vasant Hegde (9):
  iommu/amd: Pass struct iommu_dev_data to set_dte_entry()
  iommu/amd: Enable Guest Translation before registering devices
  iommu/amd: Use protection_domain.flags to check page table mode
  iommu/amd: Add support for device based TLB invalidation
  iommu/amd: Rearrange GCR3 table setup code
  iommu: Introduce iommu_group_mutex_assert()
  iommu/amd: Remove unused flush pasid functions
  iommu/amd: Rearrange device flush code
  iommu/amd: Introduce per-device domain ID to fix potential TLB
    aliasing issue

 drivers/iommu/amd/amd_iommu.h       |  29 +-
 drivers/iommu/amd/amd_iommu_types.h |  26 +-
 drivers/iommu/amd/init.c            |   6 +-
 drivers/iommu/amd/io_pgtable_v2.c   |  21 +-
 drivers/iommu/amd/iommu.c           | 627 +++++++++++++---------------
 drivers/iommu/iommu.c               |  19 +
 include/linux/iommu.h               |  24 ++
 7 files changed, 376 insertions(+), 376 deletions(-)

-- 
2.31.1