[PATCH 0/7] Convert SMMU to domain_alloc_paging()

[Jason Gunthorpe]

Add the global statics for IDENTITY and BLOCKED to the SMMU driver and
change to use domain_alloc_paging(). This allows SMMU to finalize the
domain during allocation.

This is a bit more urgent as I noticed while looking at Nicolin's patches
that the disable_bypass module parameter no longer works. The system will
boot fine but the domains will be set to IDENTITY now. To fix this the
core code must request BLOCKED domains when using ARM DMA ops with this
module option set.

This series fixes SMMU, which seems like the more important one of the
two. SMMUv3 needs a similar repair, but it is more complex to get the two
global static domains into the SMMUv3 driver. As SMMUv3 is primarily an
ARM64 driver this is less important since the normal DMA API flow already
substantially establishes blocking domains via empty IOMMU_DOMAIN_DMA
attachments. Regardless I have addressed SMMUv3 seperately.

This relies on the first few patches of the dart conversion series:

https://lore.kernel.org/r/0-v2-bff223cf6409+282-dart_paging_jgg@nvidia.com

To enable the BLOCKED global static.

Jason Gunthorpe (7):
  iommu/arm-smmu: Reorganize arm_smmu_domain_add_master()
  iommu/arm-smmu: Convert to a global static identity domain
  iommu/arm-smmu: Implement IOMMU_DOMAIN_BLOCKED
  iommu/arm-smmu: Pass arm_smmu_domain to arm_smmu_init_domain_context()
  iommu/arm-smmu: Convert to domain_alloc_paging()
  iommu: Compute dev_iommu->require_direct sooner
  iommu: Restore SMMU "disable_bypass"

 drivers/iommu/arm/arm-smmu/arm-smmu.c | 133 ++++++++++++++++++--------
 drivers/iommu/arm/arm-smmu/arm-smmu.h |   1 -
 drivers/iommu/iommu.c                 |  49 ++++++++--
 include/linux/iommu.h                 |   3 +
 4 files changed, 136 insertions(+), 50 deletions(-)


base-commit: 4dbf5230cbdc65dd71a8df9e0710e66f2997057c
-- 
2.42.0