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Date: Mon, 28 Nov 2022 17:48:02 -0300
From: Maíra Canal <mcanal@...lia.com>
To: Maxime Ripard <maxime@...no.tech>, Daniel Vetter <daniel@...ll.ch>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
David Airlie <airlied@...il.com>,
Thomas Zimmermann <tzimmermann@...e.de>
Cc: dri-devel@...ts.freedesktop.org,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
kunit-dev@...glegroups.com, linux-media@...r.kernel.org,
linux-kselftest@...r.kernel.org, linaro-mm-sig@...ts.linaro.org,
Brendan Higgins <brendan.higgins@...ux.dev>,
Dave Stevenson <dave.stevenson@...pberrypi.com>,
Javier Martinez Canillas <javierm@...hat.com>,
linux-kernel@...r.kernel.org, David Gow <davidgow@...gle.com>
Subject: Re: [PATCH v2 00/17] drm: Introduce Kunit Tests to VC4
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@...il.com>
> To: Daniel Vetter <daniel@...ll.ch>
> To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
> To: Maxime Ripard <mripard@...nel.org>
> To: Thomas Zimmermann <tzimmermann@...e.de>
> Cc: Dave Stevenson <dave.stevenson@...pberrypi.com>
> Cc: Javier Martinez Canillas <javierm@...hat.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Maíra Canal <mairacanal@...eup.net>
> Cc: Brendan Higgins <brendan.higgins@...ux.dev>
> Cc: David Gow <davidgow@...gle.com>
> Cc: linux-kselftest@...r.kernel.org
> Cc: kunit-dev@...glegroups.com
> Cc: dri-devel@...ts.freedesktop.org
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-media@...r.kernel.org
> Cc: linaro-mm-sig@...ts.linaro.org
> Signed-off-by: Maxime Ripard <maxime@...no.tech>
>
> ---
> 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@cerno.tech
>
> ---
> 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,
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