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    Subject[PATCH v13 0/6] iommu: Enhance IOMMU default DMA mode build options
    Date
    This is a reboot of Zhen Lei's series from a couple of years ago, which
    never made it across the line.

    I still think that it has some value, so taking up the mantle.

    Motivation:
    Allow lazy mode be default mode for DMA domains for all ARCHs, and not
    only those who hardcode it (to be lazy). For ARM64, currently we must use
    a kernel command line parameter to use lazy mode, which is less than
    ideal.

    I have now included the print for strict/lazy mode, which I originally
    sent in:
    https://lore.kernel.org/linux-iommu/72eb3de9-1d1c-ae46-c5a9-95f26525d435@huawei.com/

    There was some concern there about drivers and their custom prints
    conflicting with the print in that patch, but I think that it
    should be ok.

    Differences to v12:
    - Rebase to next-20210611 and include patch "iommu: Update "iommu.strict"
    documentation" as a baseline
    - Add Robin's RB tags (thanks!)
    - Please let me know if not ok with kernel-parameters.txt update
    in 3/6
    - Add a patch to mark x86 strict cmdline params as deprecated
    - Improve wording in Kconfig change and tweak iommu_dma_strict declaration

    Differences to v11:
    - Rebase to next-20210610
    - Drop strict mode globals in Intel and AMD drivers
    - Include patch to print strict vs lazy mode
    - Include patch to remove argument from iommu_set_dma_strict()

    Differences to v10:
    - Rebase to v5.13-rc4
    - Correct comment and typo in Kconfig (Randy)
    - Make Kconfig choice depend on relevant architectures
    - Update kernel-parameters.txt for CONFIG_IOMMU_DEFAULT_{LAZY,STRICT}

    John Garry (3):
    iommu: Deprecate Intel and AMD cmdline methods to enable strict mode
    iommu: Print strict or lazy mode at init time
    iommu: Remove mode argument from iommu_set_dma_strict()

    Zhen Lei (3):
    iommu: Enhance IOMMU default DMA mode build options
    iommu/vt-d: Add support for IOMMU default DMA mode build options
    iommu/amd: Add support for IOMMU default DMA mode build options

    .../admin-guide/kernel-parameters.txt | 8 ++--
    drivers/iommu/Kconfig | 41 +++++++++++++++++++
    drivers/iommu/amd/amd_iommu_types.h | 6 ---
    drivers/iommu/amd/init.c | 7 ++--
    drivers/iommu/amd/iommu.c | 6 ---
    drivers/iommu/intel/iommu.c | 16 ++++----
    drivers/iommu/iommu.c | 12 ++++--
    include/linux/iommu.h | 2 +-
    8 files changed, 66 insertions(+), 32 deletions(-)

    --
    2.26.2

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