[PATCH v4 05/13] iommu/arm-smmu-v3: Use the master-owned s1_cfg
Nicolin Chen
nicolinc at nvidia.com
Wed Jul 12 18:57:30 PDT 2023
On Wed, Jun 21, 2023 at 02:37:17PM +0800, Michael Shavit wrote:
> Insert CDs for STAGE_1 domains into a CD table owned by the
> arm_smmu_master. Remove the CD table that was owned by arm_smmu_domain.
> @@ -718,10 +718,7 @@ struct arm_smmu_domain {
>
> enum arm_smmu_domain_stage stage;
> union {
> - struct {
> struct arm_smmu_ctx_desc cd;
> - struct arm_smmu_s1_cfg s1_cfg;
> - };
> struct arm_smmu_s2_cfg s2_cfg;
> };
So the arm_smmu_domain looks like an object representing either:
1) a CD table + (if !IDENTITY) an S1 IOPT for default substream
2) an S2 IOPT
I wonder if we need something like struct arm_smmu_subdomain to
represent a substream, because now an IOMMU_DOMAIN_SVA domain is
represented by this struct arm_smmu_domain too, which is neither
of the two cases in the list above.
Thanks
Nicolin
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