Re: [PATCH v2 03/10] iommu/arm-smmu-v3: Look for existing iotlb tag in smmu_domain->invs

Nicolin Chen
2026-01-27T02:50:42Z

On Mon, Jan 26, 2026 at 05:03:01PM -0400, Jason Gunthorpe wrote:
> On Wed, Jan 21, 2026 at 05:24:21PM -0800, Nicolin Chen wrote:
> > Once arm_smmu_attach_prepare() installs an iotlb tag to smmu_domain->invs,
> > arm_smmu_domain_get_iotlb_tag() callers should get the tag from the array.
> >
> > Only the arm_smmu_domain_get_iotlb_tag() caller for new_smmu_domain in the
> > arm_smmu_attach_prepare_invs() will be allowed to allocate a new tag.
>
> It would be nicer to have two functions 'alloc' and 'find' instead of
> the bool. Alloc would call find.

Yea, that just came to me as well after seeing Will's comments
in another thread.

Nicolin