linux-kernel - Re: [PATCH v1 0/3] Clean-up arm-smmu-v3-sva.c: remove arm_smmu

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Message-Id: <169713222742.3248815.8112629001762142966.b4-ty@kernel.org>
Date:   Thu, 12 Oct 2023 19:06:47 +0100
From:   Will Deacon <will@...nel.org>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        iommu@...ts.linux.dev, Michael Shavit <mshavit@...gle.com>
Cc:     catalin.marinas@....com, kernel-team@...roid.com,
        Will Deacon <will@...nel.org>, Jason Gunthorpe <jgg@...pe.ca>,
        nicolinc@...dia.com, tina.zhang@...el.com,
        Yicong Yang <yangyicong@...ilicon.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>, jgg@...dia.com,
        Tomas Krcka <krckatom@...zon.de>, jean-philippe@...aro.org,
        Kevin Tian <kevin.tian@...el.com>,
        Mark Brown <broonie@...nel.org>, robin.murphy@....com
Subject: Re: [PATCH v1 0/3] Clean-up arm-smmu-v3-sva.c: remove arm_smmu_bond

On Tue, 5 Sep 2023 19:49:11 +0800, Michael Shavit wrote:
> This small series was originally part of a larger effort to support
> set_dev_pasid in arm-smmu-v3.c and a related SVA refactoring. But it can
> also stand on its own as an initial and prepatory clean-up.
> 
> The crux of this series relies on the observation that SVA won't
> allocate multiple SVA domains for the same device and mm pair. There's
> therefore no reason for the driver to try to normalize data allocated
> for a device/mm pair across set_dev_pasid calls. This simplification
> then allows set_dev_pasid to use the SVA iommu_domain to hold
> information instead of allocating a "bond" to represent the attachement.
> Note that long term, we'll likely want to represent the SVA domain using
> the same arm_smmu_domain struct used in arm-smmu-v3. This series serves
> as an interim step to make those later refactors easier to reason about.
> 
> [...]

Applied first two patches to will (for-joerg/arm-smmu/updates), thanks!

[1/3] iommu/arm-smmu-v3-sva: Remove unused iommu_sva handle
      https://git.kernel.org/will/c/d912aed14fe4
[2/3] iommu/arm-smmu-v3-sva: Remove bond refcount
      https://git.kernel.org/will/c/37ed36448fcd

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev