linux-kernel - Re: [PATCH 1/3] Device isolation group infrastructure (v3)

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Message-ID: <20120209112805.GN22598@amd.com>
Date:	Thu, 9 Feb 2012 12:28:05 +0100
From:	Joerg Roedel <joerg.roedel@....com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC:	David Gibson <david@...son.dropbear.id.au>, <dwmw2@...radead.org>,
	<iommu@...ts.linux-foundation.org>, <aik@...abs.ru>,
	<qemu-devel@...gnu.org>, <alex.williamson@...hat.com>,
	<kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] Device isolation group infrastructure (v3)

On Thu, Feb 09, 2012 at 08:39:28AM +1100, Benjamin Herrenschmidt wrote:
> On Wed, 2012-02-08 at 16:27 +0100, Joerg Roedel wrote:
> > Again, device grouping is done by the IOMMU drivers, so this all
> > belongs
> > into the generic iommu-code rather than the driver core.
> 
> Except that there isn't really a "generic iommu code"... discovery,
> initialization & matching of iommu vs. devices etc... that's all
> implemented in the arch specific iommu code.

The whole point of moving the iommu drivers to drivers/iommu was to
factor out common code. We are not where we want to be yet but the goal
is to move more code to the generic part.

For the group-code this means that the generic code should iterate over
all devices on a bus and build up group structures based on isolation
information provided by the arch specific code.

	Joerg

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