Re: [RESEND PATCH v10 0/3] fpga: Use standard class dev_release function

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On 7/27/21 9:55 AM, Tom Rix wrote:
>
> On 7/27/21 9:38 AM, Russ Weight wrote:
>>
>> On 7/27/21 9:22 AM, Tom Rix wrote:
>>> On 7/27/21 9:15 AM, Russ Weight wrote:
>>>> On 7/27/21 6:24 AM, Tom Rix wrote:
>>>>> On 7/26/21 2:33 PM, Russ Weight wrote:
>>>>>> Hi Moritz,
>>>>>>
>>>>>> I sent this version of the patchset out on July 8th. The only discussion has
>>>>>> been around the compat-id structure. I think there is agreement that this can
>>>>>> be treated separately. What are your thoughts? Do you think this patchset is
>>>>>> ready?
>>>>> While I agree the compat_id can be treated separately, i still have a problem with the 2 register functions.
>>>>>
>>>>> In this discussion,
>>>>>
>>>>> https://lore.kernel.org/linux-fpga/DM6PR11MB38194D113950FA4B75C7F2C485E49@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/
>>>>>
>>>>> *register_full(..., *info) becomes
>>>>>
>>>>> *register(..., *info)
>>>>>
>>>>> and
>>>>>
>>>>> *register_simple() is moved out of the public api and becomes private to the subsystem.
>>>> Somehow I missed that part of the email. I'm not sure I understand the part about
>>>> register_simple() "becomes private to the subsystem". Most users would call the simple
>>>> version of the API. Is the proposal to replicate the register_simple() interface
>>>> for each driver that calls it?
>>> Still use *register_simple() internally, so most of your patchset is unchanged.
>>>
>>> Move it out the public api. include/linux/fpga-mgr.h into someplace appropriate in drivers/fpga/
>> Ok - I'll do another spin of the patch set.
>>
>> Just to be clear, *register_full() gets renamed back to *register(). The current *register()
>> goes back to *register_simple(). *register_simple() is an exported symbol, but the function
>> prototype moves out of the public header file into private header file under drivers/fpga.
>
> Mostly.
>
> If register_simple does not need to be exported, it shouldn't be.

If *register_simple() is to reside in the fpga_mgr or fpga_region module and be
called by other modules, then it has to be exported... unless it is defined as a
static function in a header file. Shall I go that route instead? I could create
a new drivers/fpga/fpga.h file and add the *register_simple() functions there.
Or I could create separate drivers/fpga/fpga-mgr.h and drivers/fpga/fpga-region.h
header files with one static function each.

- Russ

>
> Tom
>
>>
>> - Russ
>>
>>> Tom
>>>
>>>>> Tom
>>>>>
>>>>>> Thanks,
>>>>>> - Russ
>>>>>>
>>>>>>
>>>>>> On 7/26/21 2:27 PM, Russ Weight wrote:
>>>>>>> The FPGA framework has a convention of using managed resource functions
>>>>>>> to allow parent drivers to manage the data structures allocated by the
>>>>>>> class drivers. They use an empty *_dev_release() function to satisfy the
>>>>>>> class driver.
>>>>>>>
>>>>>>> This is inconsistent with linux driver model.
>>>>>>>
>>>>>>> These changes remove the managed resource functions and populate the class
>>>>>>> dev_release callback functions. They also merge the create() and register()
>>>>>>> functions into a single register() or register_full() function for each of
>>>>>>> the fpga-mgr, fpga-region, and fpga-bridge class drivers.
>>>>>>>
>>>>>>> The new *register_full() functions accept an info data structure to provide
>>>>>>> flexibility in passing optional parameters. The *register() functions
>>>>>>> support the legacy parameter list for users that don't require the use of
>>>>>>> optional parameters.
>>>>>>>
>>>>>>> For more context, refer to this email thread:
>>>>>>>
>>>>>>> https://marc.info/?l=linux-fpga&m=162127412218557&w=2
>>>>>>>
>>>>>>> I turned on the configs assocated with each of the modified files, but I
>>>>>>> must have been missing some dependencies, because not all of them compiled.
>>>>>>> I did a run-time test specifically with the dfl-fme infrastructure. This
>>>>>>> would have exercised the region, bridge, and fpga-mgr frameworks.
>>>>>>>
>>>>>>> Changelog v9 -> v10:
>>>>>>>      - Fixed commit messages to reference register_full() instead of
>>>>>>>        register_simple().
>>>>>>>      - Removed the fpga_bridge_register_full() function, because there is
>>>>>>>        not need for it yet. Updated the documentation and commit message
>>>>>>>        accordingly.
>>>>>>>      - Updated documentation to reference the fpga_manager_info and
>>>>>>>        fpga_region_info structures.
>>>>>>>
>>>>>>> Changelog v8 -> v9:
>>>>>>>      - Cleaned up documentation for the FPGA Manager, Bridge, and Region
>>>>>>>        register functions
>>>>>>>      - Renamed fpga_*_register() to fpga_*_register_full()
>>>>>>>      - Renamed fpga_*_register_simple() to fpga_*_register()
>>>>>>>      - Renamed devm_fpga_mgr_register() to devm_fpga_mgr_register_full()
>>>>>>>      - Renamed devm_fpga_mgr_register_simple() to devm_fpga_mgr_register()
>>>>>>>
>>>>>>> Changelog v7 -> v8:
>>>>>>>      - Added reviewed-by tags.
>>>>>>>      - Updated Documentation/driver-api/fpga/ files: fpga-mgr.rst,
>>>>>>>        fpga-bridge.rst, and fpga-region.rst.
>>>>>>>
>>>>>>> Changelog v6 -> v7:
>>>>>>>      - Update the commit messages to describe the new parameters for the
>>>>>>>        *register() functions and to mention the *register_simple() functions.
>>>>>>>      - Fix function prototypes in header file to rename dev to parent.
>>>>>>>      - Make use of the PTR_ERR_OR_ZERO() macro when possible.
>>>>>>>      - Some cleanup of comments.
>>>>>>>      - Update function definitions/prototypes to apply const to the new info
>>>>>>>        parameter.
>>>>>>>      - Verify that info->br_ops is non-null in the fpga_bridge_register()
>>>>>>>        function.
>>>>>>>      - Verify a non-null info pointer in the fpga_region_register() function.
>>>>>>>
>>>>>>> Changelog v5 -> v6:
>>>>>>>      - Moved FPGA manager/bridge/region optional parameters out of the ops
>>>>>>>        structure and back into the FPGA class driver structure.
>>>>>>>      - Changed fpga_*_register() function parameters to accept an info data
>>>>>>>        structure to provide flexibility in passing optional parameters.
>>>>>>>      - Added fpga_*_register_simple() functions to support current parameters
>>>>>>>        for users that don't require use of optional parameters.
>>>>>>>
>>>>>>> Changelog v4 -> v5:
>>>>>>>      - Rebased on top of recently accepted patches.
>>>>>>>      - Removed compat_id from the fpga_mgr_register() parameter list
>>>>>>>        and added it to the fpga_manager_ops structure. This also required
>>>>>>>        dynamically allocating the dfl-fme-ops structure in order to add
>>>>>>>        the appropriate compat_id.
>>>>>>>      - Created the fpga_region_ops data structure which is optionally passed
>>>>>>>        to fpga_region_register(). compat_id, the get_bridges() pointer, and
>>>>>>>        the priv pointer are included in the fpga_region_ops structure.
>>>>>>>
>>>>>>> Changelog v3 -> v4:
>>>>>>>      - Added the compat_id parameter to fpga_mgr_register() and
>>>>>>>        devm_fpga_mgr_register() to ensure that the compat_id is set before
>>>>>>>        the device_register() call.
>>>>>>>      - Added the compat_id parameter to fpga_region_register() to ensure
>>>>>>>        that the compat_id is set before the device_register() call.
>>>>>>>      - Modified the dfl_fpga_feature_devs_enumerate() function to restore
>>>>>>>        the fpga_region_register() call to the correct location.
>>>>>>>
>>>>>>> Changelog v2 -> v3:
>>>>>>>      - Cleaned up comment headers for fpga_mgr_register(), fpga_bridge_register(),
>>>>>>>        and fpga_region_register().
>>>>>>>      - Fixed error return on ida_simple_get() failure for fpga_mgr_register(),
>>>>>>>        fpga_bridge_register(), and fpga_region_register().
>>>>>>>      - Fixed error return value for fpga_bridge_register(): ERR_PTR(ret) instead
>>>>>>>        of NULL.
>>>>>>>
>>>>>>> Changelog v1 -> v2:
>>>>>>>      - Restored devm_fpga_mgr_register() functionality to the fpga-mgr
>>>>>>>        class driver, adapted for the combined create/register functionality.
>>>>>>>      - All previous callers of devm_fpga_mgr_register() will continue to call
>>>>>>>        devm_fpga_mgr_register().
>>>>>>>      - replaced unnecessary ternary operators in return statements with
>>>>>>>        standard if conditions.
>>>>>>>
>>>>>>> Russ Weight (3):
>>>>>>>      fpga: mgr: Use standard dev_release for class driver
>>>>>>>      fpga: bridge: Use standard dev_release for class driver
>>>>>>>      fpga: region: Use standard dev_release for class driver
>>>>>>>
>>>>>>>     Documentation/driver-api/fpga/fpga-bridge.rst |   6 +-
>>>>>>>     Documentation/driver-api/fpga/fpga-mgr.rst    |  38 +++-
>>>>>>>     Documentation/driver-api/fpga/fpga-region.rst |  12 +-
>>>>>>>     drivers/fpga/altera-cvp.c                     |  12 +-
>>>>>>>     drivers/fpga/altera-fpga2sdram.c              |  12 +-
>>>>>>>     drivers/fpga/altera-freeze-bridge.c           |  10 +-
>>>>>>>     drivers/fpga/altera-hps2fpga.c                |  12 +-
>>>>>>>     drivers/fpga/altera-pr-ip-core.c              |   7 +-
>>>>>>>     drivers/fpga/altera-ps-spi.c                  |   9 +-
>>>>>>>     drivers/fpga/dfl-fme-br.c                     |  10 +-
>>>>>>>     drivers/fpga/dfl-fme-mgr.c                    |  22 +-
>>>>>>>     drivers/fpga/dfl-fme-region.c                 |  17 +-
>>>>>>>     drivers/fpga/dfl.c                            |  12 +-
>>>>>>>     drivers/fpga/fpga-bridge.c                    | 122 +++-------
>>>>>>>     drivers/fpga/fpga-mgr.c                       | 215 ++++++++----------
>>>>>>>     drivers/fpga/fpga-region.c                    | 119 ++++------
>>>>>>>     drivers/fpga/ice40-spi.c                      |   9 +-
>>>>>>>     drivers/fpga/machxo2-spi.c                    |   9 +-
>>>>>>>     drivers/fpga/of-fpga-region.c                 |  10 +-
>>>>>>>     drivers/fpga/socfpga-a10.c                    |  16 +-
>>>>>>>     drivers/fpga/socfpga.c                        |   9 +-
>>>>>>>     drivers/fpga/stratix10-soc.c                  |  16 +-
>>>>>>>     drivers/fpga/ts73xx-fpga.c                    |   9 +-
>>>>>>>     drivers/fpga/xilinx-pr-decoupler.c            |  17 +-
>>>>>>>     drivers/fpga/xilinx-spi.c                     |  11 +-
>>>>>>>     drivers/fpga/zynq-fpga.c                      |  16 +-
>>>>>>>     drivers/fpga/zynqmp-fpga.c                    |   9 +-
>>>>>>>     include/linux/fpga/fpga-bridge.h              |  30 ++-
>>>>>>>     include/linux/fpga/fpga-mgr.h                 |  62 +++--
>>>>>>>     include/linux/fpga/fpga-region.h              |  36 ++-
>>>>>>>     30 files changed, 383 insertions(+), 511 deletions(-)
>>>>>>>
>




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