linux-kernel - [RFC/PARTIAL PATCH 0/3] dma: passing "attributes" to dma_map

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Message-ID: <20080108023222.GP23661@sgi.com>
Date:	Mon, 7 Jan 2008 18:32:22 -0800
From:	akepner@....com
To:	Tony Luck <tony.luck@...el.com>,
	Grant Grundler <grundler@...isc-linux.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Jes Sorensen <jes@....com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Roland Dreier <rdreier@...co.com>,
	James Bottomley <James.Bottomley@...eleye.com>,
	David Miller <davem@...emloft.net>,
	Muli Ben-Yehuda <muli@...ibm.com>
Cc:	linux-kernel@...r.kernel.org
Subject: [RFC/PARTIAL PATCH 0/3] dma: passing "attributes" to dma_map_* routines

The following patchset allows additional "attributes" to be 
passed to dma_map_*/dma_unmap_* implementations. (The reason 
why this is useful/necessary has been mentioned several times, 
most recently here:
http://marc.info/?l=linux-kernel&m=119258541412724&w=2.)

This is incomplete in that only ia64 and x86_64 are supported - 
the purpose is mainly to give us something specific to discuss. 

The approach here is to change the dma_map_* interface so 
that the last argument is an u32 which encodes the direction 
of the dma and, optionally, other attributes. Changing the 
interface is a bit intrusive, but callers of dma_map_* don't 
need to be modified.

There are 3 patches:

[1/3] dma: create linux/dma-direction.h 
[2/3] dma: ia64/sn2 allow "attributes" to be used by dma_map_*
[2/3] dma: x86_64 allow "attributes" to be used by dma_map_*

-- 
Arthur

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