linux-kernel - Re: [PATCH 00/22 v2] Introduce default domains for iommu groups

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Message-ID: <20150605142206.GB7420@arm.com>
Date:	Fri, 5 Jun 2015 15:22:06 +0100
From:	Will Deacon <will.deacon@....com>
To:	Joerg Roedel <joro@...tes.org>
Cc:	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	Kukjin Kim <kgene@...nel.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Hiroshi Doyu <hdoyu@...dia.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	Robin Murphy <Robin.Murphy@....com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Oded Gabbay <oded.gabbay@...il.com>,
	"jroedel@...e.de" <jroedel@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/22 v2] Introduce default domains for iommu groups

Hi Joerg,

On Thu, May 28, 2015 at 05:41:23PM +0100, Joerg Roedel wrote:
> here is the second version of my patch-set to introduce
> default domains into the iommu core. This time it has a lot
> more patches, mostly because I added a proof of concept
> implementation by converting the AMD IOMMU driver to make
> use of it.

Most of this looks fine to me, modulo by comments about the dm regions
(which I'm not sure how to implement for ARM).

> Converting the first driver to the new concept triggered a
> lot of changes and extensions in the patch-set to fit all
> the needs of a more complex iommu driver. Converting other
> drivers might need further changes, but that is something
> for the future.
> 
> A major change is that now the default domain has to be
> allocated by the code that allocates the iommu group. For
> PCI devices this happens in the IOMMU core, but drivers
> allocating the group on their own can now implement a policy
> that fits their needs (e.g. not allocate one domain per
> group but let multiple groups share one domain).

Makes sense. I really think we should be moving group allocation out of
the IOMMU drivers and into the bus code, like we already have for PCI.
Once we've got a way to describe groups of platform devices (e.g. in the
device-tree), then we can have the group creation happen automatically
as part of Laurent's of_iommu work.

Will
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