iommu/arm-smmu-v3: Shrink the cdtab l1_desc array

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The top of the 2 level CD table is (at most) 1024 entries big, and two
high order allocations are required. One of __le64 which is programmed
into the HW (8k) and one of struct arm_smmu_l1_ctx_desc which holds the
CPU pointer (16k).

There are two copies of the l2ptr_dma, one is stored in the struct
arm_smmu_l1_ctx_desc, and another is encoded in the __le64 for the HW to
use. Instead of storing two copies just decode the value from the __le64.

Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/6-v4-6416877274e1+1af-smmuv3_tidy_jgg@nvidia.com
Signed-off-by: Will Deacon <will@kernel.org>

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Jason Gunthorpe 2024-09-06 12:47:53 -03:00 • committed by Will Deacon

parent 47b2de35ca

commit c0a25a96de

2 changed files with 18 additions and 25 deletions

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

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1

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

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