linux-kernel - RE: PCIe EndPoint DMA driver with DMA Framework

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Message-ID: <8520D5D51A55D047800579B094147198258B33B8@XAP-PVEXMBX01.xlnx.xilinx.com>
Date:	Tue, 14 Jun 2016 11:40:00 +0000
From:	Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>
To:	Sinan Kaya <okaya@...eaurora.org>,
	Vinod Koul <vinod.koul@...el.com>
CC:	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	nofooter <nofooter@...inx.com>,
	"dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>
Subject: RE: PCIe EndPoint DMA driver with DMA Framework

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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