On 11/28/22 11:53, Maxime Ripard wrote: > Hi, > > This series introduce Kunit tests to the vc4 KMS driver, but unlike what we > have been doing so far in KMS, it actually tests the atomic modesetting code. > > In order to do so, I've had to improve a fair bit on the Kunit helpers already > found in the tree in order to register a full blown and somewhat functional KMS > driver. > > It's of course relying on a mock so that we can test it anywhere. The mocking > approach created a number of issues, the main one being that we need to create > a decent mock in the first place, see patch 22. The basic idea is that I > created some structures to provide a decent approximation of the actual > hardware, and that would support both major architectures supported by vc4. > > This is of course meant to evolve over time and support more tests, but I've > focused on testing the HVS FIFO assignment code which is fairly tricky (and the > tests have actually revealed one more bug with our current implementation). I > used to have a userspace implementation of those tests, where I would copy and > paste the kernel code and run the tests on a regular basis. It's was obviously > fairly suboptimal, so it seemed like the perfect testbed for that series. > > It can be run using: > ./tools/testing/kunit/kunit.py run \ > --kunitconfig=drivers/gpu/drm/vc4/tests/.kunitconfig \ > --cross_compile aarch64-linux-gnu- --arch arm64 > > Let me know what you think, > Maxime Hi Maxime, It is great to see some device mocking with KUnit! Other than the comments that I pointed out in the series, I believe that a small entry on the VC4 documentation would be nice to cover how to run the tests and also what the tests are currently covering. Best Regards, - Maíra Canal > > To: David Airlie <airlied@xxxxxxxxx> > To: Daniel Vetter <daniel@xxxxxxxx> > To: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx> > To: Maxime Ripard <mripard@xxxxxxxxxx> > To: Thomas Zimmermann <tzimmermann@xxxxxxx> > Cc: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx> > Cc: Javier Martinez Canillas <javierm@xxxxxxxxxx> > Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> > Cc: Maíra Canal <mairacanal@xxxxxxxxxx> > Cc: Brendan Higgins <brendan.higgins@xxxxxxxxx> > Cc: David Gow <davidgow@xxxxxxxxxx> > Cc: linux-kselftest@xxxxxxxxxxxxxxx > Cc: kunit-dev@xxxxxxxxxxxxxxxx > Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx > Cc: linux-kernel@xxxxxxxxxxxxxxx > Cc: linux-media@xxxxxxxxxxxxxxx > Cc: linaro-mm-sig@xxxxxxxxxxxxxxxx > Signed-off-by: Maxime Ripard <maxime@xxxxxxxxxx> > > --- > Changes in v2: > - Added some documentation for public functions > - Removed the fake device probe/remove workqueue > - Made sure the tests could be compiled as modules > - Moved the vc4 tests in the vc4 module > - Applied some of the preliminary patches > - Rebased on top of current drm-misc-next branch > - Fixed checkpatch issues > - Introduced BCM2835 (Pi0-3) tests for muxing > - Introduced tests to cover past bugs we had > - Link to v1: https://lore.kernel.org/r/20221123-rpi-kunit-tests-v1-0-051a0bb60a16@xxxxxxxxxx > > --- > Maxime Ripard (17): > drm/tests: helpers: Move the helper header to include/drm > drm/tests: helpers: Document drm_kunit_device_init() > drm/tests: helpers: Rename the device init helper > drm/tests: helpers: Remove the name parameter > drm/tests: helpers: Create the device in another function > drm/tests: helpers: Switch to a platform_device > drm/tests: helpers: Make sure the device is bound > drm/tests: helpers: Allow for a custom device struct to be allocated > drm/tests: helpers: Allow to pass a custom drm_driver > drm/tests: Add a test for DRM managed actions > drm/vc4: Move HVS state to main header > drm/vc4: crtc: Introduce a lower-level crtc init helper > drm/vc4: crtc: Make encoder lookup helper public > drm/vc4: hvs: Provide a function to initialize the HVS structure > drm/vc4: tests: Introduce a mocking infrastructure > drm/vc4: tests: Fail the current test if we access a register > drm/vc4: tests: Add unit test suite for the PV muxing > > drivers/gpu/drm/tests/Makefile | 1 + > drivers/gpu/drm/tests/drm_client_modeset_test.c | 19 +- > drivers/gpu/drm/tests/drm_kunit_helpers.c | 106 ++- > drivers/gpu/drm/tests/drm_kunit_helpers.h | 11 - > drivers/gpu/drm/tests/drm_managed_test.c | 71 ++ > drivers/gpu/drm/tests/drm_modes_test.c | 19 +- > drivers/gpu/drm/tests/drm_probe_helper_test.c | 20 +- > drivers/gpu/drm/vc4/Kconfig | 15 + > drivers/gpu/drm/vc4/Makefile | 7 + > drivers/gpu/drm/vc4/tests/.kunitconfig | 14 + > drivers/gpu/drm/vc4/tests/vc4_mock.c | 200 +++++ > drivers/gpu/drm/vc4/tests/vc4_mock.h | 63 ++ > drivers/gpu/drm/vc4/tests/vc4_mock_crtc.c | 41 + > drivers/gpu/drm/vc4/tests/vc4_mock_output.c | 138 +++ > drivers/gpu/drm/vc4/tests/vc4_mock_plane.c | 47 + > drivers/gpu/drm/vc4/tests/vc4_test_pv_muxing.c | 1039 +++++++++++++++++++++++ > drivers/gpu/drm/vc4/vc4_crtc.c | 102 ++- > drivers/gpu/drm/vc4/vc4_dpi.c | 13 +- > drivers/gpu/drm/vc4/vc4_drv.c | 4 +- > drivers/gpu/drm/vc4/vc4_drv.h | 91 +- > drivers/gpu/drm/vc4/vc4_dsi.c | 9 +- > drivers/gpu/drm/vc4/vc4_hdmi_regs.h | 4 + > drivers/gpu/drm/vc4/vc4_hvs.c | 81 +- > drivers/gpu/drm/vc4/vc4_kms.c | 25 +- > drivers/gpu/drm/vc4/vc4_txp.c | 15 +- > drivers/gpu/drm/vc4/vc4_vec.c | 13 +- > include/drm/drm_kunit_helpers.h | 91 ++ > 27 files changed, 2087 insertions(+), 172 deletions(-) > --- > base-commit: 199557fab92548f8e9d5207e385097213abe0cab > change-id: 20221123-rpi-kunit-tests-87a388492a73 > > Best regards,
