From: Andi Kleen <ak@suse.de>
To: Jeff Garzik <jgarzik@pobox.com>
Subject: Re: PCI-DMA: Out of IOMMU space on x86-64 (Athlon64x2), with solution
Date: Fri, 3 Mar 2006 23:32:42 +0100
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Cc: Allen Martin <AMartin@nvidia.com>, Chris Wedgwood <cw@f00f.org>,
       Michael Monnerie <m.monnerie@zmi.at>, linux-kernel@vger.kernel.org
References: <DBFABB80F7FD3143A911F9E6CFD477B00E48CCB0@hqemmail02.nvidia.com> <200603032312.13369.ak@suse.de> <4408C1E1.7090006@pobox.com>
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On Friday 03 March 2006 23:23, Jeff Garzik wrote:
> Andi Kleen wrote:
> > On Friday 03 March 2006 22:27, Allen Martin wrote:
> >>nForce4 has 64 bit (40 bit AMD64) DMA in the SATA controller.  We gave
> >>the docs to Jeff Garzik under NDA.  He posted some non functional driver
> >>code to linux-ide earlier this week that has the 64 bit registers and
> >>structures although it doesn't make use of them.  Someone could pick
> >>this up if they wanted to work on it though.
> >
> > Thanks for the correction. Sounds nice - hopefully we'll get a driver
> > soon. I guess it's in good hands with Jeff for now.
>
> I'll happen but not soon.  Motivation is low at NV and here as well,
> since newer NV is AHCI.  The code in question, "NV ADMA", is essentially
> legacy at this point 

NForce4s are used widely in new shipping systems so I wouldn't
exactly call them legacy.

> -- though I certainly acknowledge the large current 
> installed base.  Just being honest about the current state of things...

How much work would it be to finish the prototype driver you have? 

-Andi
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