From: Russ Weight <russell.h.weight@intel.com>
To: Tom Rix <trix@redhat.com>, <mdf@kernel.org>,
<linux-fpga@vger.kernel.org>, "Wu, Hao" <hao.wu@intel.com>
Cc: <lgoncalv@redhat.com>, <yilun.xu@intel.com>,
<matthew.gerlach@intel.com>, <richard.gong@intel.com>
Subject: Re: [RESEND PATCH v10 0/3] fpga: Use standard class dev_release function
Date: Tue, 27 Jul 2021 10:16:11 -0700 [thread overview]
Message-ID: <b5519458-af01-43ee-2873-2092d552b060@intel.com> (raw)
In-Reply-To: <c3c17e6e-9a57-eb90-fe00-c442c59ad921@redhat.com>
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@DM6PR11MB3819.namprd11.prod.outlook.com/
>>>>>
>>>>> *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(-)
>>>>>>>
>
next prev parent reply other threads:[~2021-07-27 17:16 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-26 21:27 [RESEND PATCH v10 0/3] fpga: Use standard class dev_release function Russ Weight
2021-07-26 21:27 ` [RESEND PATCH v10 1/3] fpga: mgr: Use standard dev_release for class driver Russ Weight
2021-07-26 21:27 ` [RESEND PATCH v10 2/3] fpga: bridge: " Russ Weight
2021-07-26 21:27 ` [RESEND PATCH v10 3/3] fpga: region: " Russ Weight
2021-07-26 21:33 ` [RESEND PATCH v10 0/3] fpga: Use standard class dev_release function Russ Weight
2021-07-27 5:43 ` Moritz Fischer
2021-07-27 13:24 ` Tom Rix
2021-07-27 16:15 ` Russ Weight
2021-07-27 16:22 ` Tom Rix
2021-07-27 16:38 ` Russ Weight
2021-07-27 16:55 ` Tom Rix
2021-07-27 17:16 ` Russ Weight [this message]
2021-07-27 17:44 ` Tom Rix
2021-07-27 21:07 ` Russ Weight
2021-07-28 1:33 ` Xu Yilun
2021-08-20 14:59 ` Tom Rix
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