On 2/5/16, Ran Shalit [off-list ref] wrote:

Hello,

I read the readme about dma API, but still don't understand how it
should be used
It is said that dma_alloc_coherent is responsible for allocating the
buffer.

1. But how to trigger the dma transaction to start ?
2. Is there a callback when it is finished ?

It's used for data transfer between IO device and system memory. You
allocate a kernel buffer for DMA transaction (in this case dma from
device to system memory) and setup your device for dma transfer. An IO
device usually generates an interrupt when DMA transfer completes.

Thank you,
Ran

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Regards / Mit besten Gr??en,
Denis