linux-kernel - Re: [PATCH v11 0/2] UIO support for dfl devices

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Date:   Mon, 22 Feb 2021 10:56:45 -0800
From:   Tom Rix <trix@...hat.com>
To:     Xu Yilun <yilun.xu@...el.com>, gregkh@...uxfoundation.org,
        mdf@...nel.org, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     lgoncalv@...hat.com, hao.wu@...el.com
Subject: Re: [PATCH v11 0/2] UIO support for dfl devices

Yilun,

Is there anything outstanding or remaining to be done ?

Tom

On 2/3/21 5:59 PM, Xu Yilun wrote:
> This patchset supports some dfl device drivers written in userspace.
>
> In the patchset v1, the "driver_override" interface should be used to bind
> the DFL UIO driver to DFL devices. But there is concern that the 
> "driver_override" interface is not OK itself.
>
> In v2, we use a new matching algorithem. The "driver_override" interface
> is abandoned, the DFL UIO driver matches any DFL device which could not be
> handled by other DFL drivers. So the DFL UIO driver could be used for new 
> DFL devices which are not supported by kernel. The concern is the UIO may 
> not be suitable as a default/generic driver for all dfl features, such as
> features with multiple interrupts.
>
> In v4, we specify each matching device in the id_table of the UIO driver,
> just the same as other dfl drivers do. Now the UIO driver supports Ether
> Group feature. To support more DFL features, their feature ids should be
> added to the driver's id_table.
>
> Before v9, we create a "uio_pdrv_genirq" platform device using DFL devices'
> resources. Then we leverage the uio_pdrv_genirq driver for UIO support. It
> is suggested that we implement a driver in drivers/uio that directly calls
> UIO framework APIs. So we implement the uio_dfl driver in v9. The driver
> now only binds the ether group feature, which has no irq. So the irq 
> support is not implemented yet.
>
>
> Main changes from v1:
> - switch to the new matching algorithem. It matches DFL devices which could
>   not be handled by other DFL drivers.
> - refacor the code about device resources filling.
> - add the documentation.
>
> Main changes from v2:
> - split the match ops changes in dfl.c to an independent patch.
> - move the declarations needed for dfl-uio-pdev from include/linux/dfl.h
>   to driver/fpga/dfl.h
> - some minor fixes.
>
> Main changes from v3:
> - switch to specifying each matching device in the driver's id_table.
> - refactor the irq handling code.
>
> Main changes from v4:
> - refactor the irq handling code.
>
> Main changes from v5:
> - fix the res[] zero initialization issue.
> - improve the return code for probe().
> - some doc improvement.
>
> Main changes from v6:
> - use platform_device_register_resndata() for pdev creation.
>
> Main changes from v7:
> - some doc fixes.
>
> Main changes from v8:
> - switch to add a uio driver in drivers/uio
>
> Main changes from v9:
> - add this source file in MAINTAINERS
> - improve the Kconfig, add more descriptive Kconfig header, add detailed
>   path for opae uio example in Kconfig.
>
> Main changes from v10:
> - add description in doc that interrupt support is not implemented yet.
>
>
> Xu Yilun (2):
>   uio: uio_dfl: add userspace i/o driver for DFL bus
>   Documentation: fpga: dfl: Add description for DFL UIO support
>
>  Documentation/fpga/dfl.rst | 26 ++++++++++++++++++
>  MAINTAINERS                |  1 +
>  drivers/uio/Kconfig        | 17 ++++++++++++
>  drivers/uio/Makefile       |  1 +
>  drivers/uio/uio_dfl.c      | 66 ++++++++++++++++++++++++++++++++++++++++++++++
>  5 files changed, 111 insertions(+)
>  create mode 100644 drivers/uio/uio_dfl.c
>