linux-kernel - Re: [Intel IOMMU][patch 8/8] Preserve some Virtual Address when devices cannot address entire range.

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Date:	Wed, 25 Apr 2007 00:22:08 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	David Miller <davem@...emloft.net>
Cc:	ashok.raj@...el.com, ak@...e.de, linux-kernel@...r.kernel.org,
	akpm@...l.org, gregkh@...e.de, muli@...ibm.com,
	asit.k.mallick@...el.com, suresh.b.siddha@...el.com,
	anil.s.keshavamurthy@...el.com, arjan@...ux.intel.com,
	shaohua.li@...el.com
Subject: Re: [Intel IOMMU][patch 8/8] Preserve some Virtual Address when
 devices cannot address entire range.

On Tue, 24 Apr 2007 14:50:26 -0700 (PDT)
David Miller <davem@...emloft.net> wrote:

> From: Ashok Raj <ashok.raj@...el.com>
> Date: Tue, 24 Apr 2007 14:38:35 -0700
> 
> > Its not clear if we have a very generic device breakage.. most devices
> > on these platforms are going to be more recent, (except maybe some
> > legacy fd)... 
> 
> I'm not so sure, there are some "modern" sound cards that have
> a 31-bit DMA addressing limitation because they use the 31st
> bit as a status bit in their DMA descriptors :-)

The sound stuff is going away bit by bit thankfully, but the 30bit DMA
limit is present on some more demented wireless chips still.

Alan
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