Explain how to run the KUnit tests present in the DRM subsystem and clarify why the UML-only options were not added to the configuration file present in drivers/gpu/drm/.kunitconfig [1] [2].

[1] https://lore.kernel.org/dri-devel/CABVgOSn8i=LO5p7830h2XU1Jgg0KrN0qTnxkOMhf1... [2] https://lore.kernel.org/dri-devel/CAGS_qxqpiCim_sy1LDK7PLwVgWf-LKW+uNFTGM=T7...

Signed-off-by: José Expósito jose.exposito89@gmail.com --- Documentation/gpu/drm-internals.rst | 31 +++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+)

diff --git a/Documentation/gpu/drm-internals.rst b/Documentation/gpu/drm-internals.rst index 38afed24a75c..08f115417381 100644 --- a/Documentation/gpu/drm-internals.rst +++ b/Documentation/gpu/drm-internals.rst @@ -207,6 +207,37 @@ Utilities :internal:

+Unit testing +============ + +KUnit +----- + +KUnit (Kernel unit testing framework) provides a common framework for unit tests +within the Linux kernel. + +This section covers the specifics for the DRM subsystem. For general information +about KUnit, please refer to Documentation/dev-tools/kunit/start.rst. + +How to run the tests? +~~~~~~~~~~~~~~~~~~~~~ + +In order to facilitate running the test suite, a configuration file is present +in ``drivers/gpu/drm/.kunitconfig``. It can be used by ``kunit.py`` as follows: + +.. code-block:: bash + + $ ./tools/testing/kunit/kunit.py run --kunitconfig=drivers/gpu/drm \ + --kconfig_add CONFIG_VIRTIO_UML=y \ + --kconfig_add CONFIG_UML_PCI_OVER_VIRTIO=y + +.. note:: + The configuration included in ``.kunitconfig`` should be as generic as + possible. + ``CONFIG_VIRTIO_UML`` and ``CONFIG_UML_PCI_OVER_VIRTIO`` are not + included in it because they are only required for User Mode Linux. + + Legacy Support Code ===================