linux-kernel - Re: [PATCH v4 00/13] iommu/amd: Add Generic IO Page Table Framework Support

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Message-ID: <f9674d19-74bf-1209-5d9d-1517d3ad27f7@amd.com>
Date:   Mon, 4 Jan 2021 18:01:37 +0700
From:   Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To:     linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Cc:     joro@...tes.org, will@...nel.org
Subject: Re: [PATCH v4 00/13] iommu/amd: Add Generic IO Page Table Framework
 Support

Hi Joerg / Will,

Happy New Year!! Just want to follow up on this series.

Thanks,
Suravee

On 12/15/20 2:36 PM, Suravee Suthikulpanit wrote:
> 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 V3 (https://lore.kernel.org/linux-iommu/20201004014549.16065-1-suravee.suthikulpanit@amd.com/)
>    - Rebase to v5.10
>    - Patch  2: Add struct iommu_flush_ops (previously in patch 13 of v3)
>    - Patch  7: Consolidate logic into v1_free_pgtable() instead of amd_iommu_free_pgtable()
>    - Patch 12: Check ops->[map|unmap] before calling.
>    - Patch 13: Setup page table when allocating domain (instead of when attaching device).
> 
> Change from V2 (https://lore.kernel.org/lkml/835c0d46-ed96-9fbe-856a-777dcffac967@amd.com/T/#t)
>    - Patch  2: Introduce helper function io_pgtable_cfg_to_data.
>    - Patch 13: 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 (13):
>    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 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: Adopt IO page table framework for AMD IOMMU v1 page table
> 
>   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/init.c            |   2 +
>   drivers/iommu/amd/io_pgtable.c      | 564 +++++++++++++++++++++++
>   drivers/iommu/amd/iommu.c           | 672 ++++------------------------
>   drivers/iommu/io-pgtable.c          |   3 +
>   include/linux/io-pgtable.h          |   2 +
>   9 files changed, 707 insertions(+), 604 deletions(-)
>   create mode 100644 drivers/iommu/amd/io_pgtable.c
>