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

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Message-ID: <20210226012237.GA27194@yilunxu-OptiPlex-7050>
Date:   Fri, 26 Feb 2021 09:22:37 +0800
From:   Xu Yilun <yilun.xu@...el.com>
To:     Tom Rix <trix@...hat.com>, gregkh@...uxfoundation.org
Cc:     gregkh@...uxfoundation.org, mdf@...nel.org,
        linux-fpga@...r.kernel.org, linux-kernel@...r.kernel.org,
        lgoncalv@...hat.com, hao.wu@...el.com
Subject: Re: [PATCH v11 0/2] UIO support for dfl devices

On Mon, Feb 22, 2021 at 10:56:45AM -0800, Tom Rix wrote:
> Yilun,
> 
> Is there anything outstanding or remaining to be done ?

Sorry for late reply. No, this is my lastest version now.


Hi Greg:

Do you have some comments on this patchset?

Thanks,
Yilun

> 
> 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
> >