[PATCH v2 02/10] iommu/arm-smmu-v3: Shrink the strtab l1_desc array

[Nicolin Chen]

On Mon, Jun 10, 2024 at 09:31:11PM -0300, Jason Gunthorpe wrote:
> 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 at nvidia.com>
> Reviewed-by: Mostafa Saleh <smostafa at google.com>
> Signed-off-by: Jason Gunthorpe <jgg at nvidia.com>

Reviewed-by: Nicolin Chen <nicolinc at nvidia.com>