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

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Message-ID: <20080108175054.GA25168@infradead.org>
Date:	Tue, 8 Jan 2008 17:50:54 +0000
From:	Christoph Hellwig <hch@...radead.org>
To:	akepner@....com
Cc:	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>, linux-kernel@...r.kernel.org
Subject: Re: [RFC/PARTIAL PATCH 0/3] dma: passing "attributes" to dma_map_*
	routines

On Mon, Jan 07, 2008 at 06:32:22PM -0800, akepner@....com wrote:
> 
> 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.

Onething I've missed with these patches is drivers actually using
it.  What driver actually needs it and why don't you send patches
for them?
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