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* dma direction
@ 2017-01-07 19:00 Ran Shalit
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From: Ran Shalit @ 2017-01-07 19:00 UTC (permalink / raw)
  To: kernelnewbies

Hello,

I read the DMA-API-HOWTO
https://www.kernel.org/doc/Documentation/DMA-API-HOWTO.txt
Which mainly talks about dma mapping APIs.

But I don't understand what's the meaning of DMA direction in context
of mapping.
As I understand this documentation talks about mapping of dma buffers
- NOT about triggering dma copy.
In order to do a dma copy, we should use sometlink like dmaengine, Right ?

So if dma mapping is not concerned with copying dma from cpu to device
(or vice versa), why does it talks about dma direction ?

Thanks,
Ran

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