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SubjectRe: [PATCH v11 0/2] UIO support for dfl devices
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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
>

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