Re: [PATCH v2 05/10] iommu/arm-smmu-v3: Reorganize struct arm_smmu_strtab_cfg

[Will Deacon <will@kernel.org>]

On Mon, Jun 10, 2024 at 09:31:14PM -0300, Jason Gunthorpe wrote:
> The members here are being used for both the linear and the 2 level case,
> with the meaning of each item slightly different in the two cases.
> 
> Split it into a clean union where both cases have their own struct with
> their own logical names and correct types.
> 
> Adjust all the users to detect linear/2lvl and use the right sub structure
> and types consistently.
> 
> Remove STRTAB_STE_DWORDS by changing the last places to use
> sizeof(struct arm_smmu_ste).
> 
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> ---
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 79 ++++++++++-----------
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 26 +++----
>  2 files changed, 51 insertions(+), 54 deletions(-)

[...]

> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
> index 1418f21f5db6a0..8b58a30ebeb06b 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
> @@ -204,10 +204,8 @@
>  #define STRTAB_L1_DESC_SPAN		GENMASK_ULL(4, 0)
>  #define STRTAB_L1_DESC_L2PTR_MASK	GENMASK_ULL(51, 6)
>  
> -#define STRTAB_STE_DWORDS		8
> -
>  struct arm_smmu_ste {
> -	__le64 data[STRTAB_STE_DWORDS];
> +	__le64 data[8];
>  };

I'm not seeing the improvement here.

Will