linux-kernel - Re: [PATCH 7/7] iommu: Add iommu_domain::domain

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Date:   Mon, 24 Jan 2022 01:37:21 -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 7/7] iommu: Add iommu_domain::domain_ops

On Mon, Jan 24, 2022 at 03:11:02PM +0800, Lu Baolu wrote:
> Add a domain specific callback set, domain_ops, for vendor iommu driver
> to provide domain specific operations. Move domain-specific callbacks
> from iommu_ops to the domain_ops and hook them when a domain is allocated.

Ah, that's what I meant earlier.  Perfect!

Nit:  I don't think vendor is the right term here.

Maybe something like:

iommut: split struct iommu_ops

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 retreived from the device or th domain.

> +struct domain_ops {

This needs to keep an iommu in the name, i.e. iommu_domain_ops.

> +	phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);

Overly long line.

> +static inline void iommu_domain_set_ops(struct iommu_domain *domain,
> +					const struct domain_ops *ops)
> +{
> +	domain->ops = ops;
> +}

Do we really need this helper?

> +static const struct domain_ops amd_domain_ops;

Can we avoid these forward declarations or would that cause too much
churn?