On 11/28/22 15:53, Maxime Ripard wrote:
> In order to test the current atomic_check hooks we need to have a DRM
> device that has roughly the same capabilities and layout that the actual
> hardware. We'll also need a bunch of functions to create arbitrary
> atomic states.
>
> Let's create some helpers to create a device that behaves like the real
> one, and some helpers to maintain the atomic state we want to check.
>
> Signed-off-by: Maxime Ripard <maxime@xxxxxxxxxx>
> ---
[...]
> +
> +config DRM_VC4_KUNIT_TEST
> + bool "KUnit tests for VC4" if !KUNIT_ALL_TESTS
> + depends on DRM_VC4 && KUNIT
shouldn't this depend on DRM_KUNIT_TEST instead ?
[...]
> +static struct vc4_dev *__mock_device(struct kunit *test, bool is_vc5)
> +{
> + struct drm_device *drm;
> + const struct drm_driver *drv = is_vc5 ? &vc5_drm_driver : &vc4_drm_driver;
> + const struct vc4_mock_desc *desc = is_vc5 ? &vc5_mock : &vc4_mock;
> + struct vc4_dev *vc4;
Since it could be vc4 or vc5, maybe can be renamed to just struct vc_dev *vc ?
> +struct vc4_dummy_plane *vc4_dummy_plane(struct kunit *test,
> + struct drm_device *drm,
> + enum drm_plane_type type)
> +{
> + struct vc4_dummy_plane *dummy_plane;
> + struct drm_plane *plane;
> +
> + dummy_plane = drmm_universal_plane_alloc(drm,
> + struct vc4_dummy_plane, plane.base,
> + 0,
> + &vc4_dummy_plane_funcs,
> + vc4_dummy_plane_formats,
> + ARRAY_SIZE(vc4_dummy_plane_formats),
> + NULL,
> + DRM_PLANE_TYPE_PRIMARY,
> + NULL);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dummy_plane);
> +
> + plane = &dummy_plane->plane.base;
> + drm_plane_helper_add(plane, &vc4_dummy_plane_helper_funcs);
> +
> + return dummy_plane;
> +}
I guess many of these helpers could grow to be generic, like this one since
most drivers support the DRM_FORMAT_XRGB8888 format for their primary plane.
[...]
>
> +extern const struct vc4_pv_data bcm2835_pv0_data;
> +extern const struct vc4_pv_data bcm2835_pv1_data;
> +extern const struct vc4_pv_data bcm2835_pv2_data;
> +extern const struct vc4_pv_data bcm2711_pv0_data;
> +extern const struct vc4_pv_data bcm2711_pv1_data;
> +extern const struct vc4_pv_data bcm2711_pv2_data;
> +extern const struct vc4_pv_data bcm2711_pv3_data;
> +extern const struct vc4_pv_data bcm2711_pv4_data;
> +
Maybe the driver could expose a helper function to get the pixelvalve data
and avoid having to expose all of these variables? For example you could
define an enum vc4_pixelvalve type and have something like the following:
const struct vc4_pv_data *vc4_crtc_get_pixelvalve_data(enum vc4_pixelvalve pv);
All these are small nits though, the patch looks great to me and I think is
awesome to have this level of testing with KUnit. Hope other drivers follow
your lead.
Reviewed-by: Javier Martinez Canillas <javierm@xxxxxxxxxx>
--
Best regards,
Javier Martinez Canillas
Core Platforms
Red Hat
