iommu: Add IOMMU_DOMAIN_PLATFORM

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This is used when the iommu driver is taking control of the dma_ops,
currently only on S390 and power spapr. It is designed to preserve the
original ops->detach_dev() semantic that these S390 was built around.

Provide an opaque domain type and a 'default_domain' ops value that allows
the driver to trivially force any single domain as the default domain.

Update iommufd selftest to use this instead of set_platform_dma_ops

Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/2-v8-81230027b2fa+9d-iommu_all_defdom_jgg@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

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Jason Gunthorpe 2023-09-13 10:43:35 -03:00 • committed by Joerg Roedel

parent df31b29847

commit 1c68cbc64f

3 changed files with 26 additions and 9 deletions

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13

drivers/iommu/iommu.c

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14

drivers/iommu/iommufd/selftest.c

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8

include/linux/iommu.h

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