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    Subject[PATCH v4 0/6] normalize IOMMU dma mode boot options
    Date
    As Robin Murphy's suggestion:
    "It's also not necessarily obvious to the user how this interacts with
    IOMMU_DEFAULT_PASSTHROUGH, so if we really do go down this route, maybe it
    would be better to refactor the whole lot into a single selection of something
    like IOMMU_DEFAULT_MODE anyway."

    In this version, I tried to normalize the IOMMU dma mode boot options for all
    ARCHs. When IOMMU is enabled, there are 3 dma modes: paasthrough(bypass),
    lazy(mapping but defer the IOTLB invalidation), strict. But currently each
    ARCHs defined their private boot options, different with each other. For
    example, to enable/disable "passthrough", ARM64 use iommu.passthrough=1/0,
    X86 use iommu=pt/nopt, PPC/POWERNV use iommu=nobypass.


    Zhen Lei (6):
    iommu: use iommu.dma_mode to replace iommu.passthrough and
    iommu.strict
    iommu: keep dma mode build options consistent with cmdline options
    iommu: add iommu_default_dma_mode_get() helper
    s390/pci: use common boot option iommu.dma_mode
    powernv/iommu: use common boot option iommu.dma_mode
    x86/iommu: use common boot option iommu.dma_mode

    Documentation/admin-guide/kernel-parameters.txt | 42 +++++++-------------
    arch/ia64/include/asm/iommu.h | 2 -
    arch/ia64/kernel/pci-dma.c | 2 -
    arch/powerpc/platforms/powernv/pci-ioda.c | 23 +----------
    arch/s390/pci/pci_dma.c | 20 +++-------
    arch/x86/include/asm/iommu.h | 1 -
    arch/x86/kernel/pci-dma.c | 20 ----------
    drivers/iommu/Kconfig | 36 ++++++++++++++---
    drivers/iommu/amd_iommu.c | 12 +++---
    drivers/iommu/amd_iommu_init.c | 4 --
    drivers/iommu/amd_iommu_types.h | 6 ---
    drivers/iommu/intel-iommu.c | 7 +---
    drivers/iommu/iommu.c | 52 ++++++++++++++++---------
    include/linux/iommu.h | 16 ++++++++
    14 files changed, 108 insertions(+), 135 deletions(-)

    --
    1.8.3


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