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

[Daniel Vetter]

On Tue, Jan 18, 2022 at 12:22:49AM +0100, Michał Winiarski wrote:
> 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.

I think catching WARN signature in dmesg makes sense, assuming Kunit has a
standard WARN format. It would be nice to be consistent here.

I haven't looked at any details, but yes so much I want to see this done.
I'll cc a bunch of people I've talked with about this conversion,
hopefully I got them all. Maybe they can help with review and getting this
all landed!

Cheers, Daniel

> 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
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch