linux-kernel - RE: [PATCH v3 20/20] iommu: Rename attach_dev to set

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Date:   Tue, 29 Nov 2022 03:59:18 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Robin Murphy <robin.murphy@....com>,
        Jason Gunthorpe <jgg@...dia.com>
CC:     Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        Christoph Hellwig <hch@...radead.org>,
        Will Deacon <will@...nel.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        Hector Martin <marcan@...can.st>,
        Sven Peter <sven@...npeter.dev>,
        Rob Clark <robdclark@...il.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andy Gross <agross@...nel.org>,
        "Bjorn Andersson" <andersson@...nel.org>,
        Yong Wu <yong.wu@...iatek.com>,
        "Matthias Brugger" <matthias.bgg@...il.com>,
        Heiko Stuebner <heiko@...ech.de>,
        "Matthew Rosato" <mjrosato@...ux.ibm.com>,
        Orson Zhai <orsonzhai@...il.com>,
        "Baolin Wang" <baolin.wang@...ux.alibaba.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Thierry Reding <thierry.reding@...il.com>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v3 20/20] iommu: Rename attach_dev to set_dev

> From: Robin Murphy <robin.murphy@....com>
> Sent: Monday, November 28, 2022 11:53 PM
> 
> On 2022-11-28 15:00, Jason Gunthorpe wrote:
> > On Mon, Nov 28, 2022 at 01:41:56PM +0000, Robin Murphy wrote:
> >> On 2022-11-28 06:46, Lu Baolu wrote:
> >>> With the retirement of the detach_dev callback, the naming of
> attach_dev
> >>> isn't meaningful anymore. Rename it to set_dev to restore its real
> >>> meaning, that is, setting an iommu domain to a device.
> >>
> >> English grammar alert: this part is confusing, since the usual in-context
> >> reading* of "set[ting] X to Y" is going to imply assigning a value of Y to
> >> some unique property of X. Given the actual semantic that when we
> attach the
> >> device to the domain, we are setting the (current) domain as a property of
> >> the device, I think the most logical and intuitive abbreviation for this
> >> method would be set_domain(), where the target device is then clearly
> >> implied by the argument (as the target domain was for attach_dev()).
> >
> > This is the iommu_domain_ops, it seems a bit weird to call it
> > set_domain when it is already acting on a domain object.
> >
> > set_device_domain()
> >
> > ?
> 
> Ah, the iommu_domain_ops split had completely slipped my mind - maybe
> with that additional context, assign_dev() might work well enough to
> maintain the pattern while still being sufficiently different?
> 
> Otherwise, set_device_domain() (or just set_dev_domain()) sounds fair to
> me.
> 

This kind of introduces a new concept as 'device domain'...

I prefer to device_set_domain() similar to __iommu_group_set_domain().

Then set_platform_dma() can be device_set_platform_dma().

Both have 'device' as the subject to differentiate from other domain ops.