Re: [PATCH v2 4/8] iommu/arm-smmu-v3: move stall_enabled to the cd table

[Nicolin Chen]

On Mon, Jul 31, 2023 at 06:48:14PM +0800, Michael Shavit wrote:
> This controls whether CD entries will have the stall bit set when
> writing entries into the table.
> 
> Signed-off-by: Michael Shavit <mshavit@xxxxxxxxxx>
> ---
> 
> Changes in v2:
> - Use a bitfield instead of a bool for stall_enabled
> 
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 8 ++++----
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 3 ++-
>  2 files changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> index 8a286e3838d70..654acf6002bf3 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> @@ -1114,7 +1114,7 @@ int arm_smmu_write_ctx_desc(struct arm_smmu_domain *smmu_domain, int ssid,
>                         FIELD_PREP(CTXDESC_CD_0_ASID, cd->asid) |
>                         CTXDESC_CD_0_V;
> 
> -               if (smmu_domain->stall_enabled)
> +               if (smmu_domain->cd_table.stall_enabled)
>                         val |= CTXDESC_CD_0_S;

This cd_table->stall_enabled comes from master->stall_enabled, and
cd_table will be in master structure. Also, struct arm_smmu_master
pointer will be passed in to arm_smmu_write_ctx_desc(). So, there
seems to be no need of master->cd_table.stall_enabled in the end;
just use master->stall_enabled directly?

Thanks
Nicolin