linux-kernel - Re: [PATCH 0/13] IA64: unifying ways to handle multiple sets of dma mapping ops

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Date:	Wed, 7 Jan 2009 20:56:46 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	tony.luck@...el.com, linux-ia64@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 0/13] IA64: unifying ways to handle multiple sets of dma mapping ops

On Mon, Jan 05, 2009 at 11:36:05PM +0900, FUJITA Tomonori wrote:
> This patchset is the first part of the unification of ways to handle
> multiple sets of dma mapping API. The whole work consists of three
> patchset. This is for IA64 and can be applied independently.
> 
> dma_mapping_ops (or dma_ops) struct is used to handle multiple sets of
> dma mapping API by X86, SPARC, and POWER. IA64 also handle multiple
> sets of dma mapping API but in a very different way (some define
> magic).
> 
> X86 and IA64 share VT-d and SWIOTLB code. We need several workarounds
> for it because of the deference of ways to handle multiple sets of dma
> mapping API (e.g., X86 people can't freely change struct
> dma_mapping_ops in x86's dma-mapping.h now because it could break
> IA64).  Seems POWER will use SWIOTLB code soon. I think that it's time
> to unify ways to handle multiple sets of dma mapping API. After
> applying the whole work, we have struct dma_map_ops
> include/linux/dma-mapping.h (I also dream of changing all the archs to
> use SWIOTLB in order to remove the bounce code in the block and
> network stacks...).
> 
> This patchset changes IA64 to handle multiple sets of dma mapping API
> in the common way (as X86, SPARC, and POWER do):

Do you have any plans to update sparc too?
Maybe it is not relevant.

	Sam
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