[RFC 00/10] drm: selftests: Convert to KUnit

[Michał Winiarski]

KUnit unifies the test structure and provides helper tools that simplify
the development. Basic use case allows running tests as regular processes,
leveraging User Mode Linux.
For example, to execute all DRM unit tests:
./tools/testing/kunit/kunit.py run --kunitconfig=drivers/gpu/drm
(the tool also allows using QEMU instead of UML by adding e.g. --arch=x86_64)

For developers - it means that it's easier to run unit tests on the development
machine, tightening the feedback loop. When using UML, it also simplifies using
gdb for debug (since the kernel is just a regular process).
For CI systems - DRM tests can be moved from being executed on device under
test (that's also running IGTs and so on) to being executed on buildsystem
during build (just like checkpatch.pl).

All tests were renamed - IGT prefix is no longer used.

Compared to selftests executed by CI using IGT, there's one functional
regression - KUnit test runner is not catching WARNs.
To solve this, we could either go in the similar direction that UBSAN went in:
1195505 ("kunit: ubsan integration")
Or we could expand the test runner to catch WARN signature in dmesg.

Pastebin to preview the output and execution times:
https://gitlab.freedesktop.org/-/snippets/4139

-Michał

Michał Winiarski (10):
  drm: test-drm_cmdline_parser: Convert to KUnit
  drm: test-drm_plane_helper: Convert to KUnit
  drm: test-drm_format: Convert to KUnit
  drm: test-drm_framebuffer: Convert to KUnit
  drm: test-drm_damage_helper: Convert to KUnit
  drm: test-drm_dp_mst_helper: Convert to KUnit
  drm: test-drm_rect: Convert to KUnit
  drm: test-drm_mm: Convert to KUnit
  drm: selftests: Convert to KUnit
  drm: test: Simplify testing on UML with kunit.py

 drivers/gpu/drm/.kunitconfig                  |    3 +
 drivers/gpu/drm/Kconfig                       |   22 +-
 drivers/gpu/drm/Makefile                      |    2 +-
 drivers/gpu/drm/i915/Kconfig.debug            |    1 -
 drivers/gpu/drm/selftests/Makefile            |    7 -
 .../gpu/drm/selftests/drm_cmdline_selftests.h |   68 -
 drivers/gpu/drm/selftests/drm_mm_selftests.h  |   28 -
 .../gpu/drm/selftests/drm_modeset_selftests.h |   40 -
 drivers/gpu/drm/selftests/drm_selftest.c      |  109 -
 drivers/gpu/drm/selftests/drm_selftest.h      |   41 -
 .../drm/selftests/test-drm_cmdline_parser.c   | 1141 --------
 .../drm/selftests/test-drm_damage_helper.c    |  667 -----
 .../drm/selftests/test-drm_dp_mst_helper.c    |  273 --
 drivers/gpu/drm/selftests/test-drm_format.c   |  280 --
 drivers/gpu/drm/selftests/test-drm_mm.c       | 2487 -----------------
 .../drm/selftests/test-drm_modeset_common.c   |   32 -
 .../drm/selftests/test-drm_modeset_common.h   |   52 -
 .../gpu/drm/selftests/test-drm_plane_helper.c |  223 --
 drivers/gpu/drm/selftests/test-drm_rect.c     |  223 --
 drivers/gpu/drm/test/Makefile                 |    7 +
 .../gpu/drm/test/test-drm_cmdline_parser.c    | 1027 +++++++
 drivers/gpu/drm/test/test-drm_damage_helper.c |  667 +++++
 drivers/gpu/drm/test/test-drm_dp_mst_helper.c |  429 +++
 drivers/gpu/drm/test/test-drm_format.c        |  356 +++
 .../test-drm_framebuffer.c                    |  109 +-
 drivers/gpu/drm/test/test-drm_mm.c            | 2426 ++++++++++++++++
 drivers/gpu/drm/test/test-drm_plane_helper.c  |  312 +++
 drivers/gpu/drm/test/test-drm_rect.c          |  249 ++
 drivers/video/Kconfig                         |    4 +
 29 files changed, 5558 insertions(+), 5727 deletions(-)
 create mode 100644 drivers/gpu/drm/.kunitconfig
 delete mode 100644 drivers/gpu/drm/selftests/Makefile
 delete mode 100644 drivers/gpu/drm/selftests/drm_cmdline_selftests.h
 delete mode 100644 drivers/gpu/drm/selftests/drm_mm_selftests.h
 delete mode 100644 drivers/gpu/drm/selftests/drm_modeset_selftests.h
 delete mode 100644 drivers/gpu/drm/selftests/drm_selftest.c
 delete mode 100644 drivers/gpu/drm/selftests/drm_selftest.h
 delete mode 100644 drivers/gpu/drm/selftests/test-drm_cmdline_parser.c
 delete mode 100644 drivers/gpu/drm/selftests/test-drm_damage_helper.c
 delete mode 100644 drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c
 delete mode 100644 drivers/gpu/drm/selftests/test-drm_format.c
 delete mode 100644 drivers/gpu/drm/selftests/test-drm_mm.c
 delete mode 100644 drivers/gpu/drm/selftests/test-drm_modeset_common.c
 delete mode 100644 drivers/gpu/drm/selftests/test-drm_modeset_common.h
 delete mode 100644 drivers/gpu/drm/selftests/test-drm_plane_helper.c
 delete mode 100644 drivers/gpu/drm/selftests/test-drm_rect.c
 create mode 100644 drivers/gpu/drm/test/Makefile
 create mode 100644 drivers/gpu/drm/test/test-drm_cmdline_parser.c
 create mode 100644 drivers/gpu/drm/test/test-drm_damage_helper.c
 create mode 100644 drivers/gpu/drm/test/test-drm_dp_mst_helper.c
 create mode 100644 drivers/gpu/drm/test/test-drm_format.c
 rename drivers/gpu/drm/{selftests => test}/test-drm_framebuffer.c (91%)
 create mode 100644 drivers/gpu/drm/test/test-drm_mm.c
 create mode 100644 drivers/gpu/drm/test/test-drm_plane_helper.c
 create mode 100644 drivers/gpu/drm/test/test-drm_rect.c

-- 
2.34.1