linux-kernel - Re: dma_mapping

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Message-Id: <200706270021.11434.ak@suse.de>
Date:	Wed, 27 Jun 2007 00:21:11 +0200
From:	Andi Kleen <ak@...e.de>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: dma_mapping_ops for i386

On Tuesday 26 June 2007 21:59, Jeremy Fitzhardinge wrote:
> I'm looking at adding dom0 support to the pv-ops kernel.  One of the
> obvious things we need is to support real device drivers, and the
> associated p->m translations for devices.
>
> I'm thinking the cleanest thing to do is make x86-64's dma-mapping.h
> with its dma_mapping_ops common to i386 and x86-64, so we can hook the
> Xen translations in there.  Presumably we'll need to do this anyway to
> support VTd for 32-bit (but I don't know if that's a reasonable thing to
> do anyway).
>
> What do you think?

Ok, if you can do it without ifdefs. 

And no swiotlb on i386; that is something that is completely broken
in upstream Xen and needs to be fixed properly anyways.

-Andi
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