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From: "Per Förlin" <per.friden@stericsson.com>
To: "Ira W. Snyder" <iws@ovro.caltech.edu>
Cc: Linus Walleij <linus.ml.walleij@gmail.com>,
	Dan Williams <dan.j.williams@intel.com>,
	"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH RFCv2 1/2] dmaengine: add support for scatterlist to scatterlist transfers
Date: Tue, 28 Sep 2010 09:13:35 +0200	[thread overview]
Message-ID: <4CA1959F.8050806@stericsson.com> (raw)
In-Reply-To: <20100927172356.GA805@ovro.caltech.edu>

> On Mon, Sep 27, 2010 at 05:23:34PM +0200, Linus Walleij wrote:
>> 2010/9/25 Ira W. Snyder <iws@ovro.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

WARNING: multiple messages have this Message-ID (diff)
From: "Per Förlin" <per.friden@stericsson.com>
To: "Ira W. Snyder" <iws@ovro.caltech.edu>
Cc: Linus Walleij <linus.ml.walleij@gmail.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Dan Williams <dan.j.williams@intel.com>,
	"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>
Subject: Re: [PATCH RFCv2 1/2] dmaengine: add support for scatterlist to scatterlist transfers
Date: Tue, 28 Sep 2010 09:13:35 +0200	[thread overview]
Message-ID: <4CA1959F.8050806@stericsson.com> (raw)
In-Reply-To: <20100927172356.GA805@ovro.caltech.edu>

> On Mon, Sep 27, 2010 at 05:23:34PM +0200, Linus Walleij wrote:
>> 2010/9/25 Ira W. Snyder <iws@ovro.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

  parent reply	other threads:[~2010-09-28  7:36 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-09-24 23:13 [PATCH RFCv2 0/2] dma: add support for sg-to-sg transfers Ira W. Snyder
2010-09-24 23:13 ` [PATCH RFCv2 1/2] dmaengine: add support for scatterlist to scatterlist transfers Ira W. Snyder
2010-09-27 15:23   ` Linus Walleij
2010-09-27 15:23     ` Linus Walleij
2010-09-27 17:23     ` Ira W. Snyder
2010-09-27 17:23       ` Ira W. Snyder
2010-09-27 17:35       ` Dan Williams
2010-09-27 17:35         ` Dan Williams
2010-09-28  7:13       ` Per Förlin [this message]
2010-09-28  7:13         ` Per Förlin
2010-09-24 23:13 ` [PATCH RFCv2 2/2] fsldma: use generic " Ira W. Snyder

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