linux-kernel - Re: dmaengine/Query: What about scatter/gather for mem to mem transfers.

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Date:	Thu, 08 Dec 2011 13:07:50 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Viresh Kumar <viresh.kumar@...com>
Cc:	Dan Williams <dan.j.williams@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Shiraz HASHIM <shiraz.hashim@...com>,
	Armando VISCONTI <armando.visconti@...com>,
	Pratyush ANAND <pratyush.anand@...com>,
	deepak sikri <deepak.sikri@...com>,
	Vipin KUMAR <vipin.kumar@...com>,
	Vipul Kumar SAMAR <vipulkumar.samar@...com>,
	Vincenzo FRASCINO <Vincenzo.FRASCINO@...com>,
	Mirko GARDI <mirko.gardi@...com>,
	Rajeev KUMAR <rajeev-dlh.kumar@...com>,
	Amit VIRDI <amit.virdi@...com>,
	Bhupesh SHARMA <bhupesh.sharma@...com>
Subject: Re: dmaengine/Query: What about scatter/gather for mem to mem
 transfers.

On Thu, 2011-12-08 at 09:40 +0530, Viresh Kumar wrote:
> Hi Dan/Vinod
> 
> I am looking to implement scatter/gather interface for mem to mem transfers.
> But before that, i wanted to know your feedback about it.
> 
> In my case, i have memory scattered in pages and performance is not good, if
> i submit transfers page by page.
> 
> If you are Okay with the idea, i can implement it and submit soon.
> 

You mean something like:
       struct dma_async_tx_descriptor *(*device_prep_dma_sg)(
                struct dma_chan *chan,
                struct scatterlist *dst_sg, unsigned int dst_nents,
                struct scatterlist *src_sg, unsigned int src_nents,
                unsigned long flags);

Its already there, you need to implement in your driver :)

-- 
~Vinod

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