linux-kernel - Re: IOMMU and graphics cards

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Message-Id: <1246889932.2615.81.camel@macbook.infradead.org>
Date:	Mon, 06 Jul 2009 15:18:52 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	Joerg Roedel <joro@...tes.org>,
	Zhenyu Wang <zhenyu.z.wang@...el.com>, airlied@...ux.ie,
	linux-kernel@...r.kernel.org, fujita.tomonori@....ntt.co.jp,
	iommu@...ts.linux-foundation.org, mingo@...hat.com,
	David Miller <davem@...emloft.net>
Subject: Re: IOMMU and graphics cards

On Mon, 2009-07-06 at 15:11 +0200, Joerg Roedel wrote:
> Ok, cool, that sounds good. Which in-kernel DRM drivers break with IOMMU
> for you? I'll may probably add a similar temporary workaround for AMD
> IOMMU too...

The Intel one definitely broke -- I don't know about the others. There
are some old patches at http://people.freedesktop.org/~zhen/agp-mm-*
which make it look like _all_ AGP drivers are broken.

I wouldn't bother adding the workaround -- as I said, I'm planning to
rip it out of 2.6.32 (and in linux-next as soon as it's reasonable to do
so). Let's just let them fix it.

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

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