From: David Woodhouse <David.Woodhouse@intel.com>
Date: Mon, 9 Nov 2009 22:15:15 +0000 (+0000)
Subject: intel-iommu: Check for 'DMAR at zero' BIOS error earlier.
X-Git-Tag: v2.6.32-rc8~35^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=86cf898e1d0fca245173980e3897580db38569a8;p=pandora-kernel.git

intel-iommu: Check for 'DMAR at zero' BIOS error earlier.

Chris Wright has some patches which let us fall back to swiotlb nicely
if IOMMU initialisation fails. But those are a bit much for 2.6.32.

Instead, let's shift the check for the biggest problem, the HP and Acer
BIOS bug which reports a DMAR at physical address zero. That one can
actually be checked much earlier -- before we even admit to having
detected an IOMMU in the first place. So the swiotlb init goes ahead as
we want.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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