linux-kernel - Re: [PATCH 0/8] iommu: Make core iommu-groups code more generic

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Message-ID: <20151201151510.GB18805@8bytes.org>
Date:	Tue, 1 Dec 2015 16:15:10 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Yong Wu <yong.wu@...iatek.com>
Cc:	iommu@...ts.linux-foundation.org,
	Will Deacon <will.deacon@....com>,
	linux-kernel@...r.kernel.org, yingjoe.chen@...iatek.com,
	srv_heupstream@...iatek.com, Daniel Kurtz <djkurtz@...gle.com>,
	Tomasz Figa <tfiga@...gle.com>, eddie.huang@...iatek.com,
	Matthias Brugger <matthias.bgg@...il.com>
Subject: Re: [PATCH 0/8] iommu: Make core iommu-groups code more generic

Hi Yong Wu,

On Tue, Dec 01, 2015 at 07:29:51PM +0800, Yong Wu wrote:
>      Currently We have to use iommu_detach_group and iommu_attach_group.
> Is there any plan for adding detach/attach the device within a iommu
> group?

No, there is no such plan. The reason is using attach/detach_device
always also affects the other devices in the iommu-group. Therefore
attach/detach_device was limited to devices which have no others in
their group.
Having attach/detach_group makes it more obvious to the user that the
call affects more than one device.


	Joerg

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