linux-kernel - Re: [PATCH v2 10/10] iommu: Split struct iommu

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Date:   Tue, 8 Feb 2022 22:46:14 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Joerg Roedel <joro@...tes.org>, Jason Gunthorpe <jgg@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        Ben Skeggs <bskeggs@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Eric Auger <eric.auger@...hat.com>,
        Liu Yi L <yi.l.liu@...el.com>,
        Jacob jun Pan <jacob.jun.pan@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 10/10] iommu: Split struct iommu_ops

On Tue, Feb 08, 2022 at 09:25:59AM +0800, Lu Baolu wrote:
> Move the domain specific operations out of struct iommu_ops into a new
> structure that only has domain specific operations. This solves the
> problem of needing to know if the method vector for a given operation
> needs to be retrieved from the device or the domain. Logically the domain
> ops are the ones that make sense for external subsystems and endpoint
> drivers to use, while device ops, with the sole exception of domain_alloc,
> are IOMMU API internals.

I can't say I like the default_domain_ops concept all that much, but
the split itself looks like a good idea and done nicely.