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 >
