iommu/arm-smmu-v3: Move the CD generation for S1 domains into a function

Introduce arm_smmu_make_s1_cd() to build the CD from the paging S1 domain,
and reorganize all the places programming S1 domain CD table entries to
call it.

Split arm_smmu_update_s1_domain_cd_entry() from
arm_smmu_update_ctx_desc_devices() so that the S1 path has its own call
chain separate from the unrelated SVA path.

arm_smmu_update_s1_domain_cd_entry() only works on S1 domains attached to
RIDs and refreshes all their CDs. Remove case (3) from
arm_smmu_write_ctx_desc() as it is now handled by directly calling
arm_smmu_write_cd_entry().

Remove the forced clear of the CD during S1 domain attach,
arm_smmu_write_cd_entry() will do this automatically if necessary.

Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Reviewed-by: Michael Shavit <mshavit@google.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Mostafa Saleh <smostafa@google.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/3-v9-5040dc602008+177d7-smmuv3_newapi_p2_jgg@nvidia.com


[will: Drop unused arm_smmu_clean_cd_entry() function]
Signed-off-by: Will Deacon <will@kernel.org>