[PATCH v4 0/7] VFIO platform reset module rework

[Eric Auger]

This series fixes the current implementation by getting rid of the
usage of __symbol_get which caused a compilation issue with
CONFIG_MODULES disabled. On top of this, the usage of MODULE_ALIAS makes
possible to add a new reset module without being obliged to update the
framework. The new implementation relies on the reset module registering
its reset function to the vfio-platform driver.

The series is available at

https://git.linaro.org/people/eric.auger/linux.git/shortlog/refs/heads/v4.3-rc6-rework-v3

Best Regards

Eric

v3 -> v4:
- Remove the EXPORT_SYMBOL_GPL(vfio_platform_calxedaxgmac_reset) later
  in [6/7], to keep the functionality working all along the series
- Add Arnd R-b (I dared to keep them despite the above change)
- vfio_platform_unregister_reset gets the reset function to do a double
  check on the compat and the function pointer too
- __vfio_platform_register_reset turned to 'void'

v2 -> v3:
- use driver_mutex instead of reset_mutex
- style fixes: single mutex_unlock
- use static nodes; vfio_platform_register_reset now is a macro
- vfio_platform_reset_private.h removed since reset_module_(un)register
  disappear. No use of symbol_get anymore.
- new patch introducing vfio-platform-base
- reset look-up moved back at vfio-platform probe time
- new patch featuring dev_info/dev_warn

v1 -> v2:
* in vfio_platform_common.c:
  - move reset lookup at load time and put reset at release: this is to
    prevent a race between the 2 load module loads
  - reset_list becomes static
  - vfio_platform_register/unregister_reset take a const char * as compat
  - fix node link
  - remove old combo struct and cleanup proto of vfio_platform_get_reset
  - add mutex to protect the reset list
* in calxeda xgmac reset module
  - introduce vfio_platform_reset_private.h
  - use module_vfio_reset_handler macro
  - do not export vfio_platform_calxedaxgmac_reset symbol anymore
  - add a pr_info to show the device is reset by vfio reset module



Eric Auger (7):
  vfio: platform: introduce vfio-platform-base module
  vfio: platform: add capability to register a reset function
  vfio: platform: introduce module_vfio_reset_handler macro
  vfio: platform: reset: calxedaxgmac: add reset function registration
  vfio: platform: add compat in vfio_platform_device
  vfio: platform: use list of registered reset function
  vfio: platform: add dev_info on device reset

 drivers/vfio/platform/Makefile                     |   6 +-
 .../platform/reset/vfio_platform_calxedaxgmac.c    |   5 +-
 drivers/vfio/platform/vfio_amba.c                  |   1 +
 drivers/vfio/platform/vfio_platform.c              |   1 +
 drivers/vfio/platform/vfio_platform_common.c       | 119 +++++++++++++++------
 drivers/vfio/platform/vfio_platform_private.h      |  40 ++++++-
 6 files changed, 130 insertions(+), 42 deletions(-)

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1.9.1