iommu: Add ops->domain_alloc_sva()

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Make a new op that receives the device and the mm_struct that the SVA
domain should be created for. Unlike domain_alloc_paging() the dev
argument is never NULL here.

This allows drivers to fully initialize the SVA domain and allocate the
mmu_notifier during allocation. It allows the notifier lifetime to follow
the lifetime of the iommu_domain.

Since we have only one call site, upgrade the new op to return ERR_PTR
instead of NULL.

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
[Removed smmu3 related changes - Vasant]
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Tina Zhang <tina.zhang@intel.com>
Link: https://lore.kernel.org/r/20240418103400.6229-15-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

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Jason Gunthorpe 2024-04-18 10:33:59 +00:00 • committed by Joerg Roedel

parent 1af95763e0

commit 80af5a4520

2 changed files with 14 additions and 5 deletions

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16

drivers/iommu/iommu-sva.c

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3

include/linux/iommu.h

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