Subject: Re: [patch] support 64 bit pci_alloc_consistent
From: James Bottomley <James.Bottomley@steeleye.com>
To: Arjan van de Ven <arjanv@redhat.com>
Cc: Jes Sorensen <jes@wildopensource.com>,
       Linus Torvalds <torvalds@transmeta.com>,
       "David S. Miller" <davem@redhat.com>,
       Grant Grundler <grundler@dsl2.external.hp.com>,
       Colin Ngam <cngam@sgi.com>, Jeremy Higdon <jeremy@sgi.com>,
       Linux Kernel <linux-kernel@vger.kernel.org>, linux-ia64@linuxia64.org,
       wildos@sgi.com
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	<20030518142130.A30977@devserv.devel.redhat.com>
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Date: 18 May 2003 09:28:45 -0500
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On Sun, 2003-05-18 at 09:21, Arjan van de Ven wrote:
> On Sun, May 18, 2003 at 09:17:48AM -0500, James Bottomley wrote:
> > (it uses 32 bit addr and 32 bit len descriptors, but reduces len to 24
> > bits to steal the extra byte for 7 bits extra addressing).  However, it
> > is forced to request the full 64 bit address mask---I've never worked
> > out what will happen to it on a machine with more than 512GB memory.
> 
> Uh??? right now even in 2.4 arbitrary bitmasks are supported for
> non-coherent memory.

Ah, my mistake.  I keep forgetting there are two of these drivers in the
aic7xxx directory.  The 79xx does have a 64 bit descriptor and sets the
full width.  The 7xxx doesn't and sets a partial width.

Sorry,

James


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