linux-kernel - Re: [Xen-devel] Re: [RFC] Make AGP work with IOMMU

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Date:	Thu, 06 Aug 2009 20:36:21 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Dave Airlie <airlied@...il.com>, xen-devel@...ts.xensource.com,
	Zhenyu Wang <zhenyu.z.wang@...el.com>,
	Joerg Roedel <joerg.roedel@....com>,
	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
	Keir Fraser <kier.fraser@...citrix.com>
Subject: Re: [Xen-devel] Re: [RFC] Make AGP work with IOMMU

On Thu, 2009-08-06 at 12:32 -0700, Jeremy Fitzhardinge wrote:
> On 08/05/09 16:12, Dave Airlie wrote:
> > My main problem with doing this is getting testing coverage on older
> > systems, if we change all the AGP drivers, the time to find we busted
> > something is probably not until the next major distro release with this code
> > in it. So people can run stuff on 5 year old hardware in 6 months? I'm
> > not sure the gains justify the costs, but if you guys really want to do it
> > I'll take the patch, just be prepared to have it ripped out the minute
> > we get a regression we can't figure out because we haven't got the hw anymore.
> >   
> 
> Can you point to some changesets/patches to act as an example/template
> for the changes needed?

http://git.infradead.org/users/dwmw2/iommu-agp.git/shortlog/ba3139f2577eee24479db73b8dfc7d78eaf4c486

Some of the code added to intel-agp should probably be generic.

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation

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