On 19.01.2022 00:58, Daniel Latypov wrote:
change On Mon, Jan 17, 2022 at 3:24 PM Michał Winiarski <michal.winiarski@xxxxxxxxx> 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 usingNice, it's neat to see --kunitconfig being useful for having one-liners for running tests.gdb for debug (since the kernel is just a regular process).Anecdotally, I hear from davidgow@xxxxxxxxxx that using gdb and UML together isn't the nicest experience because of all the SIGSEGV flying around when emulating paging. So I'm a bit doubtful about this particular statement, but if you have tried it out and it works well, then that's good too. I just think the primary benefit of UML is faster compilation and it being somewhat lighter than bringing up a VM.
It was good enough to debug any problems that I accidentally introduced during the conversion, but perhaps that was simple enough usecase to not encounter SIGSEGVs.
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")Is the suggestion that all WARN's fail the current KUnit test? I don't think we can do that.
Yes - that's the suggestion.The CI used for DRM has a separate "WARN" test state, even if the test is PASSing, any WARNs cause the test to end up in this state.
For example: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_11112/bat-adlp-4/igt@kms_addfb_basic@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Some KUnit tests will explicitly want to trigger error paths, so we
could have a lot of false positives.
An alternative is that we can apply the 1195505 to the code paths
we're interested in, e.g.
#include <kunit/test-bug.h>
if (bad_thing()) {
kunit_fail_current_test("bad_thing happened");
}
I don't have the context to know how cumbersome this would be for the
DRM tests though.
If the answer is we want to catch any and all warnings, then we'd
perhaps want to add something to the tests themselves. And maybe we
should implement that as a KUnit library helper function so that other
tests can use it as well.
I don't thing that would work. IIUC, currently the runner is operating on taint - there's a subset of taints that it considers "fatal" (including TAINT_WARN).
If we have tests that WARN, perhaps we could introduce extra flag to the test state on per-test or per-testsuite level, to mark that the test wants to fail-on-warn? Then we would only fail if the test opted in (or other way around? if opt-out makes more sense and we have more tests that actually don't WARN as part of their normal test logic).
Or we could expand the test runner to catch WARN signature in dmesg.Ditto from the above, I think we'd wrongly mark some tests as failed for intentional warnings.Pastebin to preview the output and execution times: https://gitlab.freedesktop.org/-/snippets/4139I see these take 17-18s to exec the tests in the example snippets. FYI, if you're not already trying this on top of 5.16, there's recent changes to make the parsed output more fully realtime as well. So hopefully that should increase the usability of these tests a bit further. I only mention that since I wasn't able to apply this series without conflicts on top of v5.16.
It's applied on top of DRM subsystem integration tree (drm-tip): https://cgit.freedesktop.org/drm-tip At that time it was already based on v5.16. Most of that 17-18s is taken by two subtest of drm_mm_tests: [22:17:19] ============================================================ [22:17:19] ================= drm_mm_tests (1 subtest) ================= [22:17:27] [PASSED] test_insert [22:17:27] ================== [PASSED] drm_mm_tests =================== [22:17:27] ============================================================[22:17:27] Testing complete. Passed: 1, Failed: 0, Crashed: 0, Skipped: 0, Errors: 0 [22:17:27] Elapsed time: 10.400s total, 0.001s configuring, 2.419s building, 7.947s running
[22:17:42] ============================================================ [22:17:42] ================= drm_mm_tests (1 subtest) ================= [22:17:50] [PASSED] test_replace [22:17:50] ================== [PASSED] drm_mm_tests =================== [22:17:50] ============================================================[22:17:50] Testing complete. Passed: 1, Failed: 0, Crashed: 0, Skipped: 0, Errors: 0 [22:17:50] Elapsed time: 10.272s total, 0.001s configuring, 2.492s building, 7.776s running
Their runtime can be controlled with max_prime and max_iterations modparams - I left the default values intact, but we can tweak them to speed things up if needed.
Thanks! -Michał
-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
