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Date: Tue, 6 May 2008 13:15:54 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Gabriel C <nix.or.die@googlemail.com>
Cc: mgross@linux.intel.com, linux-kernel@vger.kernel.org, ashok.raj@intel.com,
       shaohua.li@intel.com, anil.s.keshavamurthy@intel.com,
       jbarnes@virtuousgeek.org, linux-pci@atrey.karlin.mff.cuni.cz
Subject: Re: intel-iommu: CONFIG_DMAR*=y kills my box
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On Wed, 30 Apr 2008 01:04:45 +0200
Gabriel C <nix.or.die@googlemail.com> wrote:
>

Guys, it's really painful having to scroll through thousand-line emails to
find a few lines of information.  Please trim stuff.

> 
> > 
> > I do find it quite odd that a DMA code path specific to PCIE is somehow
> > in the loop for a parallel port device.  Should this be possible?
> 
> I have no idea =) ( PCI folks added to CC )
> 
> > 
> > I could easily be wrong so feel free to correct me but;
> > I think your bios is goofy / unprepared to support IOMMU / VT-d and
> > doing strange things with enumerated a parallel port on a PCIE bus with
> > VTD is turned on...
> 
> I will contact ASUS peoples about the BIOS but it has for sure VT-d support and it is enabled.

So..  what happened here?  It seems like a pretty fatal problem, and
personally I don't think that contacting vendors about BIOS upgrades is a
suitable general solution.  It would be much better to find a kernel-based
fix or workaround?