RE: PCIe EndPoint DMA driver with DMA Framework

[Bharat Kumar Gogada]

Hi Vinod/kanya,

> On 6/13/2016 1:25 AM, Vinod Koul wrote:
> >> We are planning to write a PCIe EndPoint DMA driver with DMA
> >> Framework
> >> > targeting x86 machine.  (
> >> >
> "https://www.kernel.org/doc/Documentation/dmaengine/provider.txt";)
> >> > Our DMA controller is part of PCIe End Point.  We are targeting to
> >> > measure PCIe performance with this Framework driver.
> >> >
> >> > But when I see DMA Framework drivers is kernel source "drivers/dma"
> >> > most of the drivers are platform drivers.
> > wrong, there are bunch of PCI X86 driver. Look closely dw, ioat etc
>
> I usually see endpoint specific DMA code to reside in the endpoint device
> driver not in the dmaengine directory.
>
> I think the main question is who the consumer of this DMA controller is like
> Vinod asked.
>
> If it is a general purpose DMA controller then dmaengine would be the right
> place.
>
> If it is specific to your endpoint, then it should be set up and used in your
> endpoint device driver.
>
Our DMA controller is specific to EP.

Thanks a lot kanya and vinod for the clarifications.

Bharat


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