Re: [PATCH 2.6.11-rc2 0/3] altix: AGP bridge support for tioca chip

From: Christoph Hellwig <>
Date: 2005-02-07 21:07:59
On Fri, Feb 04, 2005 at 03:31:58PM -0600, Mark Maule wrote:
> This patchset provides new hardware support for the SGI TIOCA agp chip.
> In order to stitch this into the SGI sn2 pci dma layer, it is necessary
> to add an abstraction which is implmented by PATCH 1/3 
> (sn2-pci-dma-abstraction.patch).
> Additionally, a couple of header files were moved out of arch/ia64/sn
> and into include/asm-ia64/sn.  I also took the opportunity to kill some
> unused macros.  This is done by PATCH 2/3 (sn2-move-pci-headers.patch).
> The TIOCA driver is implemented as an sn2 pci provider with hooks 
> externalized for an upcoming agpgart backend.  The TIOCA kernel driver is
> provided with PATCH 3/3 (sn2-tioca-driver.patch).

Wouldn't it be better to allow pluggable IOMMUs at the ia64 architecture
level, replacing the machvecs?

zx1 already has a switch to use swiotl for devices with too small dma
masks (and altix would need that one aswell if it tried to support such

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Received on Mon Feb 7 05:08:14 2005

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