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