[PATCH v7 5/9] iommu/arm-smmu-v3: Make arm_smmu_alloc_cd_ptr()

[Nicolin Chen]

On Tue, Apr 16, 2024 at 04:28:16PM -0300, Jason Gunthorpe wrote:
> Only the attach callers can perform an allocation for the CD table entry,
> the other callers must not do so, they do not have the correct locking and
> they cannot sleep. Split up the functions so this is clear.
> 
> arm_smmu_get_cd_ptr() will return pointer to a CD table entry without
> doing any kind of allocation.
> 
> arm_smmu_alloc_cd_ptr() will allocate the table and any required
> leaf.
> 
> A following patch will add lockdep assertions to arm_smmu_alloc_cd_ptr()
> once the restructuring is completed and arm_smmu_alloc_cd_ptr() is never
> called in the wrong context.
> 
> Signed-off-by: Jason Gunthorpe <jgg at nvidia.com>

Reviewed-by: Nicolin Chen <nicolinc at nvidia.com>