linux-kernel - Re: IOMMU and graphics cards

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Message-Id: <1246883177.2615.33.camel@macbook.infradead.org>
Date:	Mon, 06 Jul 2009 13:26:17 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Joerg Roedel <joro@...tes.org>
Cc:	David Miller <davem@...emloft.net>, airlied@...ux.ie,
	linux-kernel@...r.kernel.org, fujita.tomonori@....ntt.co.jp,
	iommu@...ts.linux-foundation.org, mingo@...hat.com,
	Zhenyu Wang <zhenyu.z.wang@...el.com>
Subject: Re: IOMMU and graphics cards

On Fri, 2009-05-08 at 11:35 +0200, Joerg Roedel wrote:
> The other way to achieve consistency is to remove the workaround from
> VT-d code which significantly increases the chance to get the broken
> stuff fixed. David?

It's gone from 2.6.31-rc2, but even the in-tree drivers break, so I
think we have to put it back for 2.6.31 (I've sent Linus the pull
request already). 

I do intend to remove it again for 2.6.32 though, and I filed 
http://bugzilla.kernel.org/show_bug.cgi?id=13721

For now it's got a clearer description ("Workaround broken graphics
drivers") and defaults to 'n'.

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

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