Re: [PATCH 4/7] iommu/arm-smmu-v3: Remove io-pgtable-arm from sva.c

[Mostafa Saleh <smostafa@google.com>]

On Mon, Jul 06, 2026 at 01:29:10PM -0300, Jason Gunthorpe wrote:
> This is only being used to get some STE constants. Put local
> constants along side the register definitions instead.
> 
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> ---
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 13 ++++++-------
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h     |  7 +++++++
>  2 files changed, 13 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
> index 0e670c92469b2f..f82a513ede09c9 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
> @@ -11,7 +11,6 @@
>  #include <kunit/visibility.h>
>  
>  #include "arm-smmu-v3.h"
> -#include "../../io-pgtable-arm.h"
>  
>  static void __maybe_unused
>  arm_smmu_update_s1_domain_cd_entry(struct arm_smmu_domain *smmu_domain)
> @@ -41,10 +40,10 @@ static u64 page_size_to_cd(void)
>  	static_assert(PAGE_SIZE == SZ_4K || PAGE_SIZE == SZ_16K ||
>  		      PAGE_SIZE == SZ_64K);
>  	if (PAGE_SIZE == SZ_64K)
> -		return ARM_LPAE_TCR_TG0_64K;
> +		return ARM_SMMU_TCR_TG0_64K;
>  	if (PAGE_SIZE == SZ_16K)
> -		return ARM_LPAE_TCR_TG0_16K;
> -	return ARM_LPAE_TCR_TG0_4K;
> +		return ARM_SMMU_TCR_TG0_16K;
> +	return ARM_SMMU_TCR_TG0_4K;
>  }
>  
>  VISIBLE_IF_KUNIT
> @@ -85,10 +84,10 @@ void arm_smmu_make_sva_cd(struct arm_smmu_cd *target,
>  				   64ULL - vabits_actual) |
>  			FIELD_PREP(CTXDESC_CD_0_TCR_TG0, page_size_to_cd()) |
>  			FIELD_PREP(CTXDESC_CD_0_TCR_IRGN0,
> -				   ARM_LPAE_TCR_RGN_WBWA) |
> +				   ARM_SMMU_TCR_RGN_WBWA) |
>  			FIELD_PREP(CTXDESC_CD_0_TCR_ORGN0,
> -				   ARM_LPAE_TCR_RGN_WBWA) |
> -			FIELD_PREP(CTXDESC_CD_0_TCR_SH0, ARM_LPAE_TCR_SH_IS));
> +				   ARM_SMMU_TCR_RGN_WBWA) |
> +			FIELD_PREP(CTXDESC_CD_0_TCR_SH0, ARM_SMMU_TCR_SH_IS));
>  
>  		target->data[1] = cpu_to_le64(virt_to_phys(mm->pgd) &
>  					      CTXDESC_CD_1_TTB0_MASK);
> 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 95186cf84e9abb..99ca96db0d0401 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
> @@ -203,6 +203,13 @@ struct arm_vsmmu;
>  #define Q_MAX_SZ_SHIFT			(PAGE_SHIFT + MAX_PAGE_ORDER)
>  #endif
>  
> +/* Constants used for CD TCR and STE VTCR fields */
> +#define ARM_SMMU_TCR_TG0_4K	0
> +#define ARM_SMMU_TCR_TG0_64K	1
> +#define ARM_SMMU_TCR_TG0_16K	2
> +#define ARM_SMMU_TCR_RGN_WBWA	1
> +#define ARM_SMMU_TCR_SH_IS	3

Can the driver use the ones in generic_pt/armv.h instead of
re-defining them?

Thanks,
Mostafa

> +
>  /*
>   * Stream table.
>   *
> -- 
> 2.43.0
>