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Tue, 27 Jul 2021 16:15:57 +0000 Subject: Re: [RESEND PATCH v10 0/3] fpga: Use standard class dev_release function To: Tom Rix , , , "Wu, Hao" CC: , , , References: <20210726212750.121293-1-russell.h.weight@intel.com> <39607b02-bad3-0f65-c1c8-efd6036ab4f3@intel.com> <661d53d0-0ba4-d344-8da0-995a9b612905@redhat.com> From: Russ Weight Message-ID: Date: Tue, 27 Jul 2021 09:15:54 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0 Thunderbird/78.11.0 In-Reply-To: <661d53d0-0ba4-d344-8da0-995a9b612905@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Language: en-US X-ClientProxiedBy: MW4PR04CA0006.namprd04.prod.outlook.com (2603:10b6:303:69::11) To SA2PR11MB5163.namprd11.prod.outlook.com (2603:10b6:806:113::20) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [10.0.2.4] (50.43.42.212) by MW4PR04CA0006.namprd04.prod.outlook.com (2603:10b6:303:69::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4352.29 via Frontend Transport; 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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? > 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(-) >>> >