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

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On 7/27/21 2:07 PM, Russ Weight wrote:

On 7/27/21 10:44 AM, Tom Rix wrote:
On 7/27/21 10:16 AM, Russ Weight wrote:
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.
good point, exporting ok
Before I do this, can I get others to chime in? There was a previous patchset that
used *register_simple() and *register(). It seemed that the consensus at that time
was that it should be *register() and *register_full(). I'm starting to feel like
I'm going in circles...

I personally don't have a problem with two public flavors of the register function
(the way it is now), what do other's think? If it really is a problem to have two
versions of the register function, maybe I should just change all of the callers
to declare a structure and call the same register function?

It has been about 4 weeks and no one has chimed in.

Changing a public api is painful and should be done infrequently.

There should be only 1 register() call.

The introduction of the register(..., *info) is driven by compat_id.

compat_id is a broken api. I have been around with several ways to fix it.

So it looks like compat_id is going to stay so we will need the register(..., *info) version.

using *info is generally better for api stablity-wise than what we have now, tacking on parameters as needed.

how you want to get to a single public register(..., *info) call is up to you.

Changing all callers of register to use *info instead of the wrapper is a good way to go.

Tom


- Russ


Tom

- 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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