From: Alex Williamson <alex.williamson@hp.com>
To: "Magenheimer, Dan (HP Labs Fort Collins)" <dan.magenheimer@hp.com>
Cc: okrieg@us.ibm.com, Jon Mason <jdmason@us.ibm.com>,
xen-ia64-devel@lists.xensource.com,
xen-devel <xen-devel@lists.xensource.com>
Subject: Re: RE: VP problematic for backend drivers on IA64?
Date: Mon, 23 Jan 2006 08:52:57 -0700 [thread overview]
Message-ID: <1138031577.3543.24.camel@localhost> (raw)
In-Reply-To: <516F50407E01324991DD6D07B0531AD59036D8@cacexc12.americas.cpqcorp.net>
On Sun, 2006-01-22 at 14:45 -0800, Magenheimer, Dan (HP Labs Fort
Collins) wrote:
>
> Yes, unless there are legacy drivers/devices that circumvent the
> DMA interface. I don't know if this is the case on some/many/all
> Linux/ia64 configurations... perhaps someone with more familiarity
> with a broad range of Linux/ia64 configurations can comment? I
> would be concerned with, for example, IDE, GART, VGA, console...?
VGA and serial consoles don't typically do DMA-like operations AFAIK.
They may live in legacy address spaces, but I think their programming
model is entirely reads and writes. All IDE chips can operate in
standard PCI mode these days, so they should be covered by the DMA-API.
GARTs are similar to IOMMUs, they'll need to be modified to understand
the translation.
Alex
--
Alex Williamson HP Linux & Open Source Lab
prev parent reply other threads:[~2006-01-23 15:52 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-22 22:45 VP problematic for backend drivers on IA64? Magenheimer, Dan (HP Labs Fort Collins)
2006-01-23 15:52 ` Alex Williamson [this message]
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