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Subject[PATCH v5 0/6] add generic boot option for IOMMU dma mode
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v4 --> v5:
As Hanjun and Thomas Gleixner's suggestion:
1. Keep the old ARCH specific boot options no change.
2. Keep build option CONFIG_IOMMU_DEFAULT_PASSTHROUGH no change.

v4:
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: add generic boot option iommu.dma_mode
iommu: add build options corresponding to iommu.dma_mode
iommu: add iommu_default_dma_mode_get/set() helper
s390/pci: add support for generic boot option iommu.dma_mode
powernv/iommu: add support for generic boot option iommu.dma_mode
x86/iommu: add support for generic boot option iommu.dma_mode

Documentation/admin-guide/kernel-parameters.txt | 19 +++++++
arch/ia64/include/asm/iommu.h | 2 -
arch/ia64/kernel/pci-dma.c | 2 -
arch/powerpc/platforms/powernv/pci-ioda.c | 5 +-
arch/s390/pci/pci_dma.c | 14 ++---
arch/x86/include/asm/iommu.h | 1 -
arch/x86/kernel/pci-dma.c | 35 ++++++------
drivers/iommu/Kconfig | 45 ++++++++++++---
drivers/iommu/amd_iommu.c | 10 ++--
drivers/iommu/amd_iommu_init.c | 4 +-
drivers/iommu/amd_iommu_types.h | 6 --
drivers/iommu/intel-iommu.c | 9 ++-
drivers/iommu/iommu.c | 73 ++++++++++++++++++++-----
include/linux/iommu.h | 23 ++++++++
14 files changed, 176 insertions(+), 72 deletions(-)

--
1.8.3


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