iommufd: Move ioas related HWPT destruction into iommufd_hw_pagetable_destroy()

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A HWPT is permanently associated with an IOAS when it is created, remove
the strange situation where a refcount != 0 HWPT can have been
disconnected from the IOAS by putting all the IOAS related destruction in
the object destroy function.

Initializing a HWPT is two stages, we have to allocate it, attach it to a
device and then populate the domain. Once the domain is populated it is
fully linked to the IOAS.

Arrange things so that all the error unwinds flow through the
iommufd_hw_pagetable_destroy() and allow it to handle all cases.

Link: https://lore.kernel.org/r/4-v3-ae9c2975a131+2e1e8-iommufd_hwpt_jgg@nvidia.com
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

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This commit is contained in:

Jason Gunthorpe 2023-03-01 15:30:21 -04:00

parent 342b9cab8e

commit 25cde97d95

2 changed files with 21 additions and 23 deletions

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17

drivers/iommu/iommufd/device.c

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27

drivers/iommu/iommufd/hw_pagetable.c

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