[PATCH v4 00/14] drm/vkms: Allow to configure device

[José Expósito]

Hi everyone,

In preparation for ConfigFS support, a flexible way to configure VKMS device(s)
is required.
This series adds the required APIs to create a configuration, the code changes
required to apply it and KUnit test validating the changes.

Louis Chauvet and I are working on ConfigFS support. In this series I tried to
merge his changes [1] with mine [2].
I kept his Signed-off-by to reflect that, even if I show up as the author of
some/most of the patches, this was a joint effort.

I'll send the ConfigFS code [3] and its IGT tests [4] code this week.
Meanwhile, the IGT tests also exercise this series and can be used for
additional test coverage.

Best wishes,
José Expósito

[1] https://patchwork.kernel.org/project/dri-devel/cover/20250121-google-remove-crtc-index-from-parameter-v3-0-cac00a3c3544@xxxxxxxxxxx/
[2] https://patchwork.kernel.org/project/dri-devel/cover/20240813105134.17439-1-jose.exposito89@xxxxxxxxx/
[3] https://github.com/JoseExposito/linux/commits/patch-vkms-configfs/
[4] https://gitlab.freedesktop.org/jexposit/igt-gpu-tools/-/commits/vkms-configfs

Changes in v4:

  - Applied review comments by Louis Chauvet: (thanks!!)
    - Do not access "private" struct fields in tests
    - Reviewed-by in all patches
  - Rebased on top of drm-misc-next
  - Link to v3: https://lore.kernel.org/dri-devel/20250217100120.7620-1-jose.exposito89@xxxxxxxxx/T/

Changes in v3:

  - Applied review comments by Louis Chauvet:
    - Moved drm_vblank_init(..., vkms_config_get_num_crtcs()) to a different patch
    - Improved error handling in vkms_config_*_attach_*() functions
    - Fixed compilation errors when CONFIG_DRM_VKMS_KUNIT_TEST=m
    - Used for_each iterators in vkms_config_test_default_config(). A leftover
      from the removed connector hot-add code
    - Validated that vkms_config.dev wasn't NULL before calling drm_info()
    - Kept vkms_device.config as a const pointer (at the cost of casting in
      list_count_nodes())
  - Renamed "CONFIG_DRM_VKMS_KUNIT_TESTS" to "CONFIG_DRM_VKMS_KUNIT_TEST" for
    consistency with other options 
  - Rebased on top of drm-misc-next
  - Link to v2: https://lore.kernel.org/all/20250211110912.15409-1-jose.exposito89@xxxxxxxxx/

Changes in v2:

  - Applied review comments by Louis Chauvet:
    - Added Co-developped-by tags where required
    - Split the first patch in 2: vkms_connector.h/c creation and struct
      vkms_connector creation
    - Fixes a user after free/double free bug. The bug is already present
      in drm-misc-next and the fix could be merged independently
    - Implemented for_each macros for the config
    - Other naming fixes
  - Link to v1: https://lore.kernel.org/all/20250129110059.12199-1-jose.exposito89@xxxxxxxxx/

José Expósito (13):
  drm/vkms: Extract vkms_connector header
  drm/vkms: Create vkms_connector struct
  drm/vkms: Add KUnit test scaffolding
  drm/vkms: Extract vkms_config header
  drm/vkms: Move default_config creation to its own function
  drm/vkms: Set device name from vkms_config
  drm/vkms: Allow to configure multiple planes
  drm/vkms: Allow to configure multiple CRTCs
  drm/vkms: Allow to attach planes and CRTCs
  drm/vkms: Allow to configure multiple encoders
  drm/vkms: Allow to attach encoders and CRTCs
  drm/vkms: Allow to configure multiple connectors
  drm/vkms: Allow to attach connectors and encoders

Louis Chauvet (1):
  drm/vkms: Add a validation function for VKMS configuration

 .clang-format                                 |   7 +
 drivers/gpu/drm/vkms/Kconfig                  |  15 +
 drivers/gpu/drm/vkms/Makefile                 |   5 +-
 drivers/gpu/drm/vkms/tests/.kunitconfig       |   4 +
 drivers/gpu/drm/vkms/tests/Makefile           |   3 +
 drivers/gpu/drm/vkms/tests/vkms_config_test.c | 951 ++++++++++++++++++
 drivers/gpu/drm/vkms/vkms_config.c            | 640 ++++++++++++
 drivers/gpu/drm/vkms/vkms_config.h            | 437 ++++++++
 drivers/gpu/drm/vkms/vkms_connector.c         |  61 ++
 drivers/gpu/drm/vkms/vkms_connector.h         |  26 +
 drivers/gpu/drm/vkms/vkms_drv.c               |  45 +-
 drivers/gpu/drm/vkms/vkms_drv.h               |  17 +-
 drivers/gpu/drm/vkms/vkms_output.c            | 176 ++--
 13 files changed, 2246 insertions(+), 141 deletions(-)
 create mode 100644 drivers/gpu/drm/vkms/tests/.kunitconfig
 create mode 100644 drivers/gpu/drm/vkms/tests/Makefile
 create mode 100644 drivers/gpu/drm/vkms/tests/vkms_config_test.c
 create mode 100644 drivers/gpu/drm/vkms/vkms_config.c
 create mode 100644 drivers/gpu/drm/vkms/vkms_config.h
 create mode 100644 drivers/gpu/drm/vkms/vkms_connector.c
 create mode 100644 drivers/gpu/drm/vkms/vkms_connector.h

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2.48.1