linux-kernel - Re: Generic DMA-capable streaming device driver looking for home

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Message-ID: <d925a1cb-26c8-b1cf-bd99-d4cf18e6816e@jonmasters.org>
Date:   Thu, 27 Apr 2017 10:00:04 -0400
From:   Jon Masters <jcm@...masters.org>
To:     Alex Williams <alex.williams@...com>, linux-kernel@...r.kernel.org
Cc:     Moritz Fischer <moritz.fischer@...us.com>,
        Sinan Kaya <okaya@...eaurora.org>
Subject: Re: Generic DMA-capable streaming device driver looking for home

On 04/20/2017 06:10 PM, Alex Williams wrote:
> Hi all,
> 
> We're writing a device driver and having some difficulty matching a
> subsystem to the driver/device properties. Can anyone help with
> direction?
> 
> These are some basic properties:
> 1) Device is used to carry generic data to/from userspace. It's a pair
>    of dumb streams with one sink and one source for each direction (no
>    addressable endpoints for the other side).
> 2) Data goes to/from a DMA engine in an FPGA at high throughput.
> 3) The driver enables userspace to queue multiple DMA-able buffers for
>    asynchronous, pipelined data transfer. We currently use the
>    videobuf2 API to provide the feature. We're not carrying video data
>    in general, though.
> 
> It's a piece of a software-defined radio system, and while it can carry
> data from DACs/ADCs, the device is only a generic transport. It doesn't
> know what data it's carrying, so neither would the driver.
> 
> Some guidance would be greatly appreciated. Thanks!

This might be close enough to hidma that Sinan would have suggestions?