[PATCH v2 00/16] drm/vkms: Add configfs support

["José Expósito" <jose.exposito89@gmail.com>]

Hi everyone,

This series, to be applied on top of [1], allow to configure one or more VKMS
instances without having to reload the driver using configfs.

The series is structured in 3 blocks:

  - Patches 1..11: Basic device configuration. For simplicity, I kept the
    available options as minimal as possible.

  - Patches 12 and 13: New option to skip the default device creation and to-do
    cleanup.

  - Patches 14, 15 and 16: Allow to hot-plug and unplug connectors. This is not
    part of the minimal set of options, but I included in this series so it can
    be used as a template/example of how new configurations can be added.

The process of configuring a VKMS device is documented in "vkms.rst".

Finally, the code is thoroughly tested by a collection of IGT tests [2].

Best wishes,
José Expósito

[1] https://lore.kernel.org/all/20250218101214.5790-1-jose.exposito89@gmail.com/
[2] https://lists.freedesktop.org/archives/igt-dev/2025-February/086071.html

Changes in v2:

  - Applied review comments by Louis Chauvet: (thanks!!)
    - Use guard(mutex)(...) instead of lock/unlock
    - Return -EBUSY when trying to modify a enabled device
    - Move the connector hot-plug related patches to the end
  - Rebased on top of drm-misc-next
  - Link to v1: https://lore.kernel.org/dri-devel/20250218170808.9507-1-jose.exposito89@gmail.com/T/

José Expósito (16):
  drm/vkms: Expose device creation and destruction
  drm/vkms: Add and remove VKMS instances via configfs
  drm/vkms: Allow to configure multiple planes via configfs
  drm/vkms: Allow to configure the plane type via configfs
  drm/vkms: Allow to configure multiple CRTCs via configfs
  drm/vkms: Allow to configure CRTC writeback support via configfs
  drm/vkms: Allow to attach planes and CRTCs via configfs
  drm/vkms: Allow to configure multiple encoders via configfs
  drm/vkms: Allow to attach encoders and CRTCs via configfs
  drm/vkms: Allow to configure multiple connectors via configfs
  drm/vkms: Allow to attach connectors and encoders via configfs
  drm/vkms: Allow to configure the default device creation
  drm/vkms: Remove completed task from the TODO list
  drm/vkms: Allow to configure connector status
  drm/vkms: Allow to update the connector status
  drm/vkms: Allow to configure connector status via configfs

 Documentation/gpu/vkms.rst                    | 100 ++-
 drivers/gpu/drm/vkms/Kconfig                  |   1 +
 drivers/gpu/drm/vkms/Makefile                 |   3 +-
 drivers/gpu/drm/vkms/tests/vkms_config_test.c |  24 +
 drivers/gpu/drm/vkms/vkms_config.c            |   8 +-
 drivers/gpu/drm/vkms/vkms_config.h            |  26 +
 drivers/gpu/drm/vkms/vkms_configfs.c          | 807 ++++++++++++++++++
 drivers/gpu/drm/vkms/vkms_configfs.h          |   8 +
 drivers/gpu/drm/vkms/vkms_connector.c         |  26 +-
 drivers/gpu/drm/vkms/vkms_connector.h         |  18 +-
 drivers/gpu/drm/vkms/vkms_drv.c               |  18 +-
 drivers/gpu/drm/vkms/vkms_drv.h               |  20 +
 drivers/gpu/drm/vkms/vkms_output.c            |   2 +-
 13 files changed, 1045 insertions(+), 16 deletions(-)
 create mode 100644 drivers/gpu/drm/vkms/vkms_configfs.c
 create mode 100644 drivers/gpu/drm/vkms/vkms_configfs.h


base-commit: 130377304ed09e54ff35a8974372498aad7059f3
prerequisite-patch-id: 1bff7bbc4ef0e29266265ac3dc009011c046f745
prerequisite-patch-id: 74a284d40a426a0038a7054068192238f7658187
prerequisite-patch-id: c3e34e88ad6a0acf7d9ded0cdb4745a87cf6fd82
prerequisite-patch-id: 9cd0dfaf8e21a811edbe5a2da7185b6f9055d42d
prerequisite-patch-id: f50c41578b639370a5d610af6f25c2077321a886
prerequisite-patch-id: 5a7219a51e42de002b8dbf94ec8af96320043489
prerequisite-patch-id: 67ea5d4e21b4ce4acbd6fc3ce83017f55811c49b
prerequisite-patch-id: 37a7fab113a32581f053c09f45efb137afd75a1b
prerequisite-patch-id: 475bcdc6267f4b02fb1bb2379145529c33684e4f
prerequisite-patch-id: d3114f0b3da3d8b5ad64692df761f1cf42fbdf12
prerequisite-patch-id: d1d9280fb056130df2050a09b7ea7e7ddde007c5
prerequisite-patch-id: 2c370f3de6d227fa8881212207978cce7bbb18ba
prerequisite-patch-id: 938b8fe5437e5f7bc22bffc55ae249a27d399d66
prerequisite-patch-id: ab0a510994fbe9985dc46a3d35e6d0574ddbb633
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2.48.1