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

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The top of the 2 level stream table is (at most) 128k entries big, and two
high order allocations are required. One of __le64 which is programmed
into the HW (1M), and one of struct arm_smmu_strtab_l1_desc which holds
the CPU pointer (3M).

There is no reason to store the l2ptr_dma as nothing reads it. devm stores
a copy of it and the DMA memory will be freed via devm mechanisms. span is
a constant of 8+1. Remove both.

This removes 16 bytes from each arm_smmu_l1_ctx_desc and saves up to 2M of
memory per iommu instance.

Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Mostafa Saleh <smostafa@google.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Link: https://lore.kernel.org/r/2-v2-318ed5f6983b+198f-smmuv3_tidy_jgg@nvidia.com
Signed-off-by: Will Deacon <will@kernel.org>

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This commit is contained in:

Jason Gunthorpe 2024-06-10 21:31:11 -03:00 • committed by Will Deacon

parent c84c5ab76c

commit a4d75360f7

2 changed files with 6 additions and 10 deletions

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13

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

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3

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

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