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

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Date:   Mon, 24 Jan 2022 09:58:18 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        "Jason Gunthorpe" <jgg@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        Ben Skeggs <bskeggs@...hat.com>,
        "Raj, Ashok" <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>
CC:     Alex Williamson <alex.williamson@...hat.com>,
        Eric Auger <eric.auger@...hat.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Pan, Jacob jun" <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" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 7/7] iommu: Add iommu_domain::domain_ops

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Monday, January 24, 2022 3:11 PM
> +/**
> + * struct domain_ops - per-domain ops
> + * @attach_dev: attach an iommu domain to a device
> + * @detach_dev: detach an iommu domain from a device

What is the criteria about whether an op should be iommu_ops or domain_ops
when it requires both domain and device pointers like above two (and future
PASID-based attach)?

Other examples include:
	@apply_resv_region
	@is_attach_deferred

Thanks
Kevin