None of the drm_bridge function have kunit tests so far. Let's change
that, starting with drm_bridge_get_current_state().
Signed-off-by: Maxime Ripard <mripard@xxxxxxxxxx>
---
drivers/gpu/drm/Kconfig | 1 +
drivers/gpu/drm/tests/Makefile | 1 +
drivers/gpu/drm/tests/drm_bridge_test.c | 210 ++++++++++++++++++++++++++++++++
3 files changed, 212 insertions(+)
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index d9986fd52194fae87e04fc7fbf038e7afad320d9..cd950bba379b10bcee5e7fb24c090056c7a6dc04 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -72,10 +72,11 @@ config DRM_KUNIT_TEST_HELPERS
KUnit Helpers for KMS drivers.
config DRM_KUNIT_TEST
tristate "KUnit tests for DRM" if !KUNIT_ALL_TESTS
depends on DRM && KUNIT && MMU
+ select DRM_BRIDGE_CONNECTOR
select DRM_BUDDY
select DRM_DISPLAY_DP_HELPER
select DRM_DISPLAY_HDMI_STATE_HELPER
select DRM_DISPLAY_HELPER
select DRM_EXEC
diff --git a/drivers/gpu/drm/tests/Makefile b/drivers/gpu/drm/tests/Makefile
index 0109bcf7faa54993cce337f522eae78f0fa6ffcb..6691c577d2d4581a4185bac2ce89a6b14b339b35 100644
--- a/drivers/gpu/drm/tests/Makefile
+++ b/drivers/gpu/drm/tests/Makefile
@@ -3,10 +3,11 @@
obj-$(CONFIG_DRM_KUNIT_TEST_HELPERS) += \
drm_kunit_helpers.o
obj-$(CONFIG_DRM_KUNIT_TEST) += \
drm_atomic_state_test.o \
+ drm_bridge_test.o \
drm_buddy_test.o \
drm_cmdline_parser_test.o \
drm_connector_test.o \
drm_damage_helper_test.o \
drm_dp_mst_helper_test.o \
diff --git a/drivers/gpu/drm/tests/drm_bridge_test.c b/drivers/gpu/drm/tests/drm_bridge_test.c
new file mode 100644
index 0000000000000000000000000000000000000000..c0a05c459d957c3f9d281957f002f6bd36cce367
--- /dev/null
+++ b/drivers/gpu/drm/tests/drm_bridge_test.c
@@ -0,0 +1,210 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Kunit test for drm_bridge functions
+ */
+#include <drm/drm_atomic_state_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_bridge_connector.h>
+#include <drm/drm_kunit_helpers.h>
+
+#include <kunit/test.h>
+
+struct drm_bridge_init_priv {
+ struct drm_device drm;
+ struct drm_plane *plane;
+ struct drm_crtc *crtc;
+ struct drm_encoder encoder;
+ struct drm_bridge bridge;
+ struct drm_connector *connector;
+};
+
+static const struct drm_bridge_funcs drm_test_bridge_legacy_funcs = {
+};
+
+static const struct drm_bridge_funcs drm_test_bridge_atomic_funcs = {
+ .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
+ .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
+ .atomic_reset = drm_atomic_helper_bridge_reset,
+};
+
+KUNIT_DEFINE_ACTION_WRAPPER(drm_bridge_remove_wrapper,
+ drm_bridge_remove,
+ struct drm_bridge *);
+
+static int drm_kunit_bridge_add(struct kunit *test,
+ struct drm_bridge *bridge)
+{
+ drm_bridge_add(bridge);
+
+ return kunit_add_action_or_reset(test,
+ drm_bridge_remove_wrapper,
+ bridge);
+}
+
+static struct drm_bridge_init_priv *
+drm_test_bridge_init(struct kunit *test, const struct drm_bridge_funcs *funcs)
+{
+ struct drm_bridge_init_priv *priv;
+ struct drm_encoder *enc;
+ struct drm_bridge *bridge;
+ struct drm_device *drm;
+ 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_bridge_init_priv, drm,
+ DRIVER_MODESET | DRIVER_ATOMIC);
+ if (IS_ERR(priv))
+ return ERR_CAST(priv);
+
+ drm = &priv->drm;
+ priv->plane = drm_kunit_helper_create_primary_plane(test, drm,
+ NULL,
+ NULL,
+ NULL, 0,
+ NULL);
+ if (IS_ERR(priv->plane))
+ return ERR_CAST(priv->plane);
+
+ priv->crtc = drm_kunit_helper_create_crtc(test, drm,
+ priv->plane, NULL,
+ NULL,
+ NULL);
+ if (IS_ERR(priv->crtc))
+ return ERR_CAST(priv->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(priv->crtc);
+
+ bridge = &priv->bridge;
+ bridge->type = DRM_MODE_CONNECTOR_VIRTUAL;
+ bridge->funcs = funcs;
+
+ ret = drm_kunit_bridge_add(test, bridge);
+ if (ret)
+ return ERR_PTR(ret);
+
+ ret = drm_bridge_attach(enc, bridge, NULL, 0);
+ if (ret)
+ return ERR_PTR(ret);
+
+ priv->connector = drm_bridge_connector_init(drm, enc);
+ if (IS_ERR(priv->connector))
+ return ERR_CAST(priv->connector);
+
+ drm_connector_attach_encoder(priv->connector, enc);
+
+ drm_mode_config_reset(drm);
+
+ return priv;
+}
+
+/*
+ * Test that drm_bridge_get_current_state() returns the last committed
+ * state for an atomic bridge.
+ */
+static void drm_test_drm_bridge_get_current_state_atomic(struct kunit *test)
+{
+ struct drm_modeset_acquire_ctx ctx;
+ struct drm_bridge_init_priv *priv;
+ struct drm_bridge_state *curr_bridge_state;
+ struct drm_bridge_state *bridge_state;
+ struct drm_atomic_state *state;
+ struct drm_bridge *bridge;
+ struct drm_device *drm;
+ int ret;
+
+ priv = drm_test_bridge_init(test, &drm_test_bridge_atomic_funcs);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv);
+
+ drm_modeset_acquire_init(&ctx, 0);
+
+ drm = &priv->drm;
+ state = drm_kunit_helper_atomic_state_alloc(test, drm, &ctx);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state);
+
+retry_commit:
+ bridge = &priv->bridge;
+ bridge_state = drm_atomic_get_bridge_state(state, bridge);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, bridge_state);
+
+ ret = drm_atomic_commit(state);
+ if (ret == -EDEADLK) {
+ drm_atomic_state_clear(state);
+ drm_modeset_backoff(&ctx);
+ goto retry_commit;
+ }
+ KUNIT_ASSERT_EQ(test, ret, 0);
+
+ drm_modeset_drop_locks(&ctx);
+ drm_modeset_acquire_fini(&ctx);
+
+ drm_modeset_acquire_init(&ctx, 0);
+
+retry_state:
+ ret = drm_modeset_lock(&bridge->base.lock, &ctx);
+ if (ret == -EDEADLK) {
+ drm_modeset_backoff(&ctx);
+ goto retry_state;
+ }
+
+ curr_bridge_state = drm_bridge_get_current_state(bridge);
+ KUNIT_EXPECT_PTR_EQ(test, curr_bridge_state, bridge_state);
+
+ drm_modeset_unlock(&bridge->base.lock);
+
+ drm_modeset_drop_locks(&ctx);
+ drm_modeset_acquire_fini(&ctx);
+}
+
+/*
+ * Test that drm_bridge_get_current_state() returns NULL for a
+ * non-atomic bridge.
+ */
+static void drm_test_drm_bridge_get_current_state_legacy(struct kunit *test)
+{
+ struct drm_bridge_init_priv *priv;
+ struct drm_bridge *bridge;
+
+ priv = drm_test_bridge_init(test, &drm_test_bridge_legacy_funcs);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv);
+
+ /*
+ * NOTE: Strictly speaking, we should take the bridge->base.lock
+ * before calling that function. However, bridge->base is only
+ * initialized if the bridge is atomic, while we explicitly
+ * initialize one that isn't there.
+ *
+ * In order to avoid unnecessary warnings, let's skip the
+ * locking. The function would return NULL in all cases anyway,
+ * so we don't really have any concurrency to worry about.
+ */
+ bridge = &priv->bridge;
+ KUNIT_EXPECT_NULL(test, drm_bridge_get_current_state(bridge));
+}
+
+static struct kunit_case drm_bridge_get_current_state_tests[] = {
+ KUNIT_CASE(drm_test_drm_bridge_get_current_state_atomic),
+ KUNIT_CASE(drm_test_drm_bridge_get_current_state_legacy),
+ { }
+};
+
+
+static struct kunit_suite drm_bridge_get_current_state_test_suite = {
+ .name = "drm_test_bridge_get_current_state",
+ .test_cases = drm_bridge_get_current_state_tests,
+};
+
+kunit_test_suite(drm_bridge_get_current_state_test_suite);
+
+MODULE_AUTHOR("Maxime Ripard <mripard@xxxxxxxxxx>");
+MODULE_DESCRIPTION("Kunit test for drm_bridge functions");
+MODULE_LICENSE("GPL");
--
2.48.1
