[PATCH v4 06/15] drm/tests: Create tests for drm_atomic

[Maxime Ripard <mripard@kernel.org>]

We don't have a set of kunit tests for the functions under drm_atomic.h.
Let's use the introduction of drm_atomic_get_connector_for_encoder() to
create some tests for it and thus create that set.

Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
 drivers/gpu/drm/tests/Makefile          |   1 +
 drivers/gpu/drm/tests/drm_atomic_test.c | 153 ++++++++++++++++++++++++++++++++
 2 files changed, 154 insertions(+)

diff --git a/drivers/gpu/drm/tests/Makefile b/drivers/gpu/drm/tests/Makefile
index 6691c577d2d4581a4185bac2ce89a6b14b339b35..3afd6587df0831a0d10e91ff0a584af6ba1813e4 100644
--- a/drivers/gpu/drm/tests/Makefile
+++ b/drivers/gpu/drm/tests/Makefile
@@ -2,10 +2,11 @@
 
 obj-$(CONFIG_DRM_KUNIT_TEST_HELPERS) += \
 	drm_kunit_helpers.o
 
 obj-$(CONFIG_DRM_KUNIT_TEST) += \
+	drm_atomic_test.o \
 	drm_atomic_state_test.o \
 	drm_bridge_test.o \
 	drm_buddy_test.o \
 	drm_cmdline_parser_test.o \
 	drm_connector_test.o \
diff --git a/drivers/gpu/drm/tests/drm_atomic_test.c b/drivers/gpu/drm/tests/drm_atomic_test.c
new file mode 100644
index 0000000000000000000000000000000000000000..ea91bec6569e688ad33149d8ee6ecc3562b61254
--- /dev/null
+++ b/drivers/gpu/drm/tests/drm_atomic_test.c
@@ -0,0 +1,153 @@
+// 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");

-- 
2.48.1