Date: Tue, 8 Jan 2008 17:50:54 +0000
From: Christoph Hellwig <hch@infradead.org>
To: akepner@sgi.com
Cc: Tony Luck <tony.luck@intel.com>,
       Grant Grundler <grundler@parisc-linux.org>,
       Jesse Barnes <jbarnes@virtuousgeek.org>, Jes Sorensen <jes@sgi.com>,
       Randy Dunlap <randy.dunlap@oracle.com>,
       Roland Dreier <rdreier@cisco.com>,
       James Bottomley <James.Bottomley@steeleye.com>,
       David Miller <davem@davemloft.net>, Muli Ben-Yehuda <muli@il.ibm.com>,
       linux-kernel@vger.kernel.org
Subject: Re: [RFC/PARTIAL PATCH 0/3] dma: passing "attributes" to dma_map_*
	routines
Message-ID: <20080108175054.GA25168@infradead.org>
References: <20080108023222.GP23661@sgi.com>
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On Mon, Jan 07, 2008 at 06:32:22PM -0800, akepner@sgi.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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