linux-kernel - Re: [PATCH v2 2/2] Documentation: fpga: dfl: Add description for DFL UIO support

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Message-ID: <4bbaa5ad-b0eb-8ea6-9dc6-c08060450e36@redhat.com>
Date:   Mon, 14 Dec 2020 14:14:56 -0800
From:   Tom Rix <trix@...hat.com>
To:     Xu Yilun <yilun.xu@...el.com>, mdf@...nel.org,
        linux-fpga@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     gregkh@...uxfoundation.org, lgoncalv@...hat.com, hao.wu@...el.com
Subject: Re: [PATCH v2 2/2] Documentation: fpga: dfl: Add description for DFL
 UIO support


On 12/13/20 7:36 PM, Xu Yilun wrote:
> This patch adds description for UIO support for dfl devices on DFL
> bus.
>
> Signed-off-by: Xu Yilun <yilun.xu@...el.com>
> ---
> v2: no doc in v1, add it for v2.
> ---
>  Documentation/fpga/dfl.rst | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
Should add your self in the authors list.
>
> diff --git a/Documentation/fpga/dfl.rst b/Documentation/fpga/dfl.rst
> index 0404fe6..a15e81e 100644
> --- a/Documentation/fpga/dfl.rst
> +++ b/Documentation/fpga/dfl.rst
> @@ -502,6 +502,29 @@ FME Partial Reconfiguration Sub Feature driver (see drivers/fpga/dfl-fme-pr.c)
>  could be a reference.
>  
>  
> +UIO support for DFL devices
> +===========================
> +The FPGA is open for users to be reprogramed with newly developed hardware

The purpose of an FPGA is to be reprogrammed with newly developed hardware

components.  New hardware can

> +components. They could instantiate a new private feature in the DFL, and then
> +get a DFL device in their system. In some cases users may need a userspace
> +driver for the DFL device:
> +
> +* Users may need to run some diagnostic test for their hardwares.
* Users may prototype the kernel driver in user space.
> +* Some hardware is designed for specific purposes and does not fit into one of
> +  the standard kernel subsystems.
> +
> +This requires the direct access to the MMIO space and interrupt handling in
> +userspace. We implemented a dfl-uio-pdev module which exposes the UIO device
The dfl-uio-pdev module exposes
> +interfaces. It adds the uio_pdrv_genirq platform device with the resources of
> +the DFL device, and let the generic UIO platform device driver provide UIO
the DLF device, and lets
> +support to userspace.
Use FPGA_DFL_UIO_PDEV to enable this feature.
> +
> +The DFL UIO driver has a special matching algorithem. It will match any DFL
> +device which could not be handled by other DFL drivers. In this way, it will
> +not impact the functionality of the features which are already supported by the
> +system.
(not sure if this section is needed)

> +
> +
>  Open discussion
>  ===============
>  FME driver exports one ioctl (DFL_FPGA_FME_PORT_PR) for partial reconfiguration