drivers/gpu/drm/tests/drm_atomic_test.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Kunit test for drm_atomic functions
 */
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_state_helper.h>
#include <drm/drm_atomic_uapi.h>
#include <drm/drm_encoder.h>
#include <drm/drm_kunit_helpers.h>
#include <drm/drm_modeset_helper_vtables.h>

#include <kunit/test.h>

struct drm_atomic_test_priv {
	struct drm_device drm;
	struct drm_plane *plane;
	struct drm_crtc *crtc;
	struct drm_encoder encoder;
	struct drm_connector connector;
};

static const struct drm_connector_helper_funcs drm_atomic_init_connector_helper_funcs = {
};

static const struct drm_connector_funcs drm_atomic_init_connector_funcs = {
	.atomic_destroy_state	= drm_atomic_helper_connector_destroy_state,
	.atomic_duplicate_state	= drm_atomic_helper_connector_duplicate_state,
	.reset			= drm_atomic_helper_connector_reset,
};

static struct drm_atomic_test_priv *create_device(struct kunit *test)
{
	struct drm_atomic_test_priv *priv;
	struct drm_connector *connector;
	struct drm_encoder *enc;
	struct drm_device *drm;
	struct drm_plane *plane;
	struct drm_crtc *crtc;
	struct device *dev;
	int ret;

	dev = drm_kunit_helper_alloc_device(test);
	if (IS_ERR(dev))
		return ERR_CAST(dev);

	priv = drm_kunit_helper_alloc_drm_device(test, dev,
						 struct drm_atomic_test_priv, drm,
						 DRIVER_MODESET | DRIVER_ATOMIC);
	if (IS_ERR(priv))
		return ERR_CAST(priv);

	drm = &priv->drm;
	plane = drm_kunit_helper_create_primary_plane(test, drm,
						      NULL,
						      NULL,
						      NULL, 0,
						      NULL);
	if (IS_ERR(plane))
		return ERR_CAST(plane);
	priv->plane = plane;

	crtc = drm_kunit_helper_create_crtc(test, drm,
					    plane, NULL,
					    NULL,
					    NULL);
	if (IS_ERR(crtc))
		return ERR_CAST(crtc);
	priv->crtc = crtc;

	enc = &priv->encoder;
	ret = drmm_encoder_init(drm, enc, NULL, DRM_MODE_ENCODER_TMDS, NULL);
	if (ret)
		return ERR_PTR(ret);

	enc->possible_crtcs = drm_crtc_mask(crtc);

	connector = &priv->connector;
	ret = drmm_connector_init(drm, connector,
				  &drm_atomic_init_connector_funcs,
				  DRM_MODE_CONNECTOR_VIRTUAL,
				  NULL);
	if (ret)
		return ERR_PTR(ret);

	drm_connector_helper_add(connector, &drm_atomic_init_connector_helper_funcs);

	drm_connector_attach_encoder(connector, enc);

	drm_mode_config_reset(drm);

	return priv;
}

static void drm_test_drm_atomic_get_connector_for_encoder(struct kunit *test)
{
	struct drm_modeset_acquire_ctx ctx;
	struct drm_atomic_test_priv *priv;
	struct drm_display_mode *mode;
	struct drm_connector *curr_connector;
	int ret;

	priv = create_device(test);
	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv);

	mode = drm_kunit_display_mode_from_cea_vic(test, &priv->drm, 16);
	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, mode);

	drm_modeset_acquire_init(&ctx, 0);

retry_enable:
	ret = drm_kunit_helper_enable_crtc_connector(test, &priv->drm,
						     priv->crtc, &priv->connector,
						     mode, &ctx);
	if (ret == -EDEADLK) {
		drm_modeset_backoff(&ctx);
		goto retry_enable;
	}
	KUNIT_ASSERT_EQ(test, ret, 0);

	drm_modeset_drop_locks(&ctx);
	drm_modeset_acquire_fini(&ctx);

	drm_modeset_acquire_init(&ctx, 0);

retry_conn:
	curr_connector = drm_atomic_get_connector_for_encoder(&priv->encoder,
							      &ctx);
	if (PTR_ERR(curr_connector) == -EDEADLK) {
		drm_modeset_backoff(&ctx);
		goto retry_conn;
	}
	KUNIT_EXPECT_PTR_EQ(test, curr_connector, &priv->connector);

	drm_modeset_drop_locks(&ctx);
	drm_modeset_acquire_fini(&ctx);
}

static struct kunit_case drm_atomic_get_connector_for_encoder_tests[] = {
	KUNIT_CASE(drm_test_drm_atomic_get_connector_for_encoder),
	{ }
};


static struct kunit_suite drm_atomic_get_connector_for_encoder_test_suite = {
	.name = "drm_test_atomic_get_connector_for_encoder",
	.test_cases = drm_atomic_get_connector_for_encoder_tests,
};

kunit_test_suite(drm_atomic_get_connector_for_encoder_test_suite);

MODULE_AUTHOR("Maxime Ripard <mripard@kernel.org>");
MODULE_DESCRIPTION("Kunit test for drm_atomic functions");
MODULE_LICENSE("GPL");