linux-kernel - Re: [RFC 0/2] fix dma_map_sg not to do barriers for each buffer

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Date:	Wed, 10 Feb 2010 22:40:30 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Randy Dunlap <rdunlap@...otime.net>
Cc:	adharmap@...eaurora.org, linux-arm-kernel@...ts.infradead.org,
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Catalin Marinas <catalin.marinas@....com>,
	Abhijeet Dharmapurikar <adharmap@...cinc.com>
Subject: Re: [RFC 0/2] fix dma_map_sg not to do barriers for each buffer

On Wed, Feb 10, 2010 at 01:27:47PM -0800, Randy Dunlap wrote:
> On 02/10/10 12:37, adharmap@...eaurora.org wrote:
> > From: Abhijeet Dharmapurikar <adharmap@...cinc.com>
> > 
> > Please refer to the post here
> > http://lkml.org/lkml/2010/1/4/347
> > 
> > These changes are to introduce barrierless dma_map_area and dma_unmap_area and
> > use them to map the buffers in the scatterlist. For the last buffer, call
> > the normal dma_map_area(aka with barriers) effectively executing the barrier
> > at the end of the operation.
> > 
> > Note that the barrierless operations are implemented for few arm
> > architectures only and I would implement for others once these are okayed by the
> > community.
> 
> So when you add these interfaces for other architectures, you will also
> update Documentation/DMA-API.txt,  right??

Do we need barrier-less interfaces for anything other than the dma_*_sg
functions?
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