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

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Message-ID: <aXgn6xOqtE8935A/@Asurada-Nvidia>
Date: Mon, 26 Jan 2026 18:50:19 -0800
From: Nicolin Chen <nicolinc@...dia.com>
To: Jason Gunthorpe <jgg@...dia.com>
CC: <will@...nel.org>, <robin.murphy@....com>, <joro@...tes.org>,
	<jpb@...nel.org>, <praan@...gle.com>, <miko.lenczewski@....com>,
	<linux-arm-kernel@...ts.infradead.org>, <iommu@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>, <patches@...ts.linux.dev>
Subject: Re: [PATCH v2 03/10] iommu/arm-smmu-v3: Look for existing iotlb tag
 in smmu_domain->invs

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