iommu/arm-smmu-v3: Make domain_alloc_paging_flags() directly determine the S1/S2

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The selection of S1/S2 is a bit indirect today, make
domain_alloc_paging_flags() directly decode the flags and select the
correct S1/S2 type.

Directly reject flag combinations the HW doesn't support when processing
the flags.

Fix missing rejection of some flag combinations that are not supported
today (ie NEST_PARENT | DIRTY_TRACKING) by using a switch statement to
list out exactly the combinations that are currently supported.

Move the determination of the stage out of arm_smmu_domain_finalise() and
into both callers. As today the default stage is S1 if supported in HW.

This makes arm_smmu_domain_alloc_paging_flags() self contained and no
longer calling arm_smmu_domain_alloc_paging().

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/2-v1-0bb8d5313a27+27b-smmuv3_paging_flags_jgg@nvidia.com
Signed-off-by: Will Deacon <will@kernel.org>

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Jason Gunthorpe 2024-12-05 11:43:28 -04:00 • committed by Will Deacon

parent 48e7b8e284

commit bb857c5c01

1 changed files with 30 additions and 12 deletions

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drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c

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