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
