Re: dmaengine/Query: What about scatter/gather for mem to memtransfers.

[Vinod Koul]

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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