linux-kernel - Re: [PATCH RFCv2 1/2] dmaengine: add support for scatterlist to scatterlist transfers

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Message-ID: <4CA1959F.8050806@stericsson.com>
Date:	Tue, 28 Sep 2010 09:13:35 +0200
From:	Per Förlin <per.friden@...ricsson.com>
To:	"Ira W. Snyder" <iws@...o.caltech.edu>
Cc:	Linus Walleij <linus.ml.walleij@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dan Williams <dan.j.williams@...el.com>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH RFCv2 1/2] dmaengine: add support for scatterlist to scatterlist
 transfers

> On Mon, Sep 27, 2010 at 05:23:34PM +0200, Linus Walleij wrote:
>> 2010/9/25 Ira W. Snyder <iws@...o.caltech.edu>:
>>
>>> This adds support for scatterlist to scatterlist DMA transfers.
>>
>> This is a good idea, we have a local function to do this in DMA40 already,
>> stedma40_memcpy_sg().
>>
> 
> I think that having two devices that want to implement this
> functionality as part of the DMAEngine API is a good argument for making
> it available as part of the core API. I think it would be good to add
> this to struct dma_device, and add a capability (DMA_SG?) for it as
> well.
> 
> I have looked at the stedma40_memcpy_sg() function, and I think we would
> want to extend it slightly for the generic API. Is there any good reason
> to prohibit scatterlists with different numbers of elements?
No

/Per
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