linux-kernel - Re: [PATCH v5 3/7] iommu/arm-smmu-v3: Introduce a per-domain arm_smmu

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Message-ID: <aSTfC5WFoa6sJlBj@Asurada-Nvidia>
Date: Mon, 24 Nov 2025 14:41:15 -0800
From: Nicolin Chen <nicolinc@...dia.com>
To: Will Deacon <will@...nel.org>
CC: <jean-philippe@...aro.org>, <robin.murphy@....com>, <joro@...tes.org>,
	<jgg@...dia.com>, <balbirs@...dia.com>, <miko.lenczewski@....com>,
	<peterz@...radead.org>, <kevin.tian@...el.com>, <praan@...gle.com>,
	<linux-arm-kernel@...ts.infradead.org>, <iommu@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 3/7] iommu/arm-smmu-v3: Introduce a per-domain
 arm_smmu_invs array

On Mon, Nov 24, 2025 at 09:42:31PM +0000, Will Deacon wrote:
> On Sat, Nov 08, 2025 at 12:08:04AM -0800, Nicolin Chen wrote:

> > +EXPORT_SYMBOL_IF_KUNIT(arm_smmu_invs_merge);
> 
> There's nothing really SMMU-specific about this data structure manipulation.
> Do you think we can abstract the invalidation array concept into a library
> which other IOMMU drivers could use too?

Yea, I am trying to shift to that at this moment, hopefully to
combine the iotlb tag (asid/vmid) allocation as well. We do see
it could be quite useful in AMD driver already.

And I will address the other remarks of yours.

Thanks
Nicolin