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

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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.

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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