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

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Message-Id: <1265886199.3389.47.camel@pc1117.cambridge.arm.com>
Date:	Thu, 11 Feb 2010 11:03:19 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	linux-arm-msm@...r.kernel.org, adharmap@...eaurora.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Abhijeet Dharmapurikar <adharmap@...cinc.com>
Subject: Re: [RFC 0/2] fix dma_map_sg not to do barriers for each buffer

On Thu, 2010-02-11 at 11:01 +0000, Russell King - ARM Linux wrote:
> On Thu, Feb 11, 2010 at 10:53:05AM +0000, Catalin Marinas wrote:
> > Actually after L2 maintenance we don't even need the __dma_barrier(), we
> > need an outer_cache.sync() function.
> >
> > I can do the outer cache optimisations together with a few others for
> > PL310 (which does not require the cache_wait() call for line
> > operations).
> 
> I'm in half a mind to say "stop everything for the DMA API and wait
> until the next merge window" - what we have at the moment is a big
> shake up of how the API is implemented, which has had very little
> attributable testing.
> 
> Let's get the current code (which missed the last merge window) tested,
> acked and merged, and only then sort out these kinds of optimizations
> after that.  As it is, these DMA patches have had very little in the
> way of attributable feedback so far.

I agree, I wasn't planning to submit anything for 2.6.34. These
optimisations should probably get in 2.6.35.

-- 
Catalin

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