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Date: Sat, 9 Oct 2021 16:15:55 +0800
From: Xu Yilun <yilun.xu@...el.com>
To: Russ Weight <russell.h.weight@...el.com>
Cc: mdf@...nel.org, linux-fpga@...r.kernel.org,
linux-kernel@...r.kernel.org, trix@...hat.com, lgoncalv@...hat.com,
hao.wu@...el.com, matthew.gerlach@...el.com
Subject: Re: [PATCH v12 0/3] fpga: Use standard class dev_release function
On Tue, Sep 14, 2021 at 02:43:24PM -0700, 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.
The patchset is good to me. Any more comments?
Thanks,
Yilun
>
> Changelog v11 -> v12:
> - Made the requisite changes to the new versal-fpga driver
>
> Changelog v10 -> v11:
> - Rebased to latest linux-next
> - Resolved a single conflict in fpga-mgr.c with associated with wrapper
> function: fpga_mgr_state(mgr)
>
> 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/versal-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 ++-
> 31 files changed, 386 insertions(+), 517 deletions(-)
>
> --
> 2.25.1
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