linux-kernel - [PATCH v6 19/26] drm/tests: bridge: add KUnit tests for DRM bridges (init and destroy)

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Message-Id: <20250206-hotplug-drm-bridge-v6-19-9d6f2c9c3058@bootlin.com>
Date: Thu, 06 Feb 2025 19:14:34 +0100
From: Luca Ceresoli <luca.ceresoli@...tlin.com>
To: Simona Vetter <simona@...ll.ch>, Inki Dae <inki.dae@...sung.com>, 
 Jagan Teki <jagan@...rulasolutions.com>, 
 Marek Szyprowski <m.szyprowski@...sung.com>, 
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
 Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, Daniel Thompson <danielt@...nel.org>, 
 Andrzej Hajda <andrzej.hajda@...el.com>, Jonathan Corbet <corbet@....net>, 
 Sam Ravnborg <sam@...nborg.org>, Boris Brezillon <bbrezillon@...nel.org>, 
 Nicolas Ferre <nicolas.ferre@...rochip.com>, 
 Alexandre Belloni <alexandre.belloni@...tlin.com>, 
 Claudiu Beznea <claudiu.beznea@...on.dev>, 
 Jessica Zhang <quic_jesszhan@...cinc.com>
Cc: Paul Kocialkowski <contact@...lk.fr>, 
 Maxime Ripard <mripard@...nel.org>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>, 
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>, 
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, 
 Hervé Codina <herve.codina@...tlin.com>, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 linux-doc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 Paul Kocialkowski <paul.kocialkowski@...tlin.com>, 
 Luca Ceresoli <luca.ceresoli@...tlin.com>
Subject: [PATCH v6 19/26] drm/tests: bridge: add KUnit tests for DRM
 bridges (init and destroy)

Add a basic KUnit test for the newly introduced drm_bridge_alloc().

Signed-off-by: Luca Ceresoli <luca.ceresoli@...tlin.com>

---

Changed in v6:
 - update to new drm_bridge_alloc() API
 - remove drm_test_drm_bridge_put test, not straightforward to write with
   the new API and the current notification mechanism
 - do not allocate a drm_device: a bridge is allocated without one
 - rename some identifiers for easier code reading

This patch was added in v5.
---
 drivers/gpu/drm/tests/Makefile          |  1 +
 drivers/gpu/drm/tests/drm_bridge_test.c | 72 +++++++++++++++++++++++++++++++++
 2 files changed, 73 insertions(+)

diff --git a/drivers/gpu/drm/tests/Makefile b/drivers/gpu/drm/tests/Makefile
index 56dab563abd7a7ee7c147bd6b4927e2436b82e1d..909f98a132bb1d057b2666e8b891683ffb11cca4 100644
--- a/drivers/gpu/drm/tests/Makefile
+++ b/drivers/gpu/drm/tests/Makefile
@@ -4,6 +4,7 @@ obj-$(CONFIG_DRM_KUNIT_TEST_HELPERS) += \
 	drm_kunit_helpers.o
 
 obj-$(CONFIG_DRM_KUNIT_TEST) += \
+	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_bridge_test.c b/drivers/gpu/drm/tests/drm_bridge_test.c
new file mode 100644
index 0000000000000000000000000000000000000000..dc5e9260cedaa29126fd6af25a6ba2f6eee05a87
--- /dev/null
+++ b/drivers/gpu/drm/tests/drm_bridge_test.c
@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Kunit test for DRM bridges
+ */
+
+#include <drm/drm_bridge.h>
+
+#include <kunit/device.h>
+#include <kunit/test.h>
+
+struct drm_bridge_test_ctx {
+	struct device *dev;
+};
+
+/*
+ * Mimick the typical struct defined by a bridge driver, which embeds a
+ * bridge plus other fields.
+ */
+struct dummy_drm_bridge {
+	int dummy; // ensure we test non-zero @bridge offset
+	struct drm_bridge bridge;
+};
+
+static const struct drm_bridge_funcs drm_bridge_dummy_funcs = {
+};
+
+static int drm_test_bridge_init(struct kunit *test)
+{
+	struct drm_bridge_test_ctx *ctx;
+
+	ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+
+	ctx->dev = kunit_device_register(test, "drm-bridge-dev");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx->dev);
+
+	test->priv = ctx;
+	return 0;
+}
+
+/*
+ * Test that the allocation and initialization of a bridge works as
+ * expected and doesn't report any error.
+ */
+static void drm_test_drm_bridge_alloc(struct kunit *test)
+{
+	struct drm_bridge_test_ctx *ctx = test->priv;
+	struct dummy_drm_bridge *dummy;
+
+	dummy = devm_drm_bridge_alloc(ctx->dev, struct dummy_drm_bridge, bridge,
+				      &drm_bridge_dummy_funcs);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dummy);
+}
+
+static struct kunit_case drm_bridge_alloc_tests[] = {
+	KUNIT_CASE(drm_test_drm_bridge_alloc),
+	{ }
+};
+
+static struct kunit_suite drm_bridge_alloc_test_suite = {
+	.name = "drm_bridge_alloc",
+	.init = drm_test_bridge_init,
+	.test_cases = drm_bridge_alloc_tests,
+};
+
+kunit_test_suites(
+	&drm_bridge_alloc_test_suite,
+);
+
+MODULE_AUTHOR("Luca Ceresoli <luca.ceresoli@...tlin.com>");
+MODULE_DESCRIPTION("Kunit test for drm_bridge functions");
+MODULE_LICENSE("GPL");

-- 
2.34.1