drm/tests: Add a test for DRM managed actions

DRM-managed actions are supposed to be ran whenever the device is
released. Let's introduce a basic unit test to make sure it happens.

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Maíra Canal <mcanal@igalia.com>
Link: https://lore.kernel.org/r/20221123-rpi-kunit-tests-v3-12-4615a663a84a@cerno.tech
Signed-off-by: Maxime Ripard <maxime@cerno.tech>

diff --git a/drivers/gpu/drm/tests/Makefile b/drivers/gpu/drm/tests/Makefile
index ef14bd481139541306c0b87ddb213ba43a4de58c..aaf357e29c656bea11bdbbaff18f1517aebf0ee1 100644 (file)
--- a/drivers/gpu/drm/tests/Makefile
+++ b/drivers/gpu/drm/tests/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_DRM_KUNIT_TEST) += \
        drm_format_helper_test.o \
        drm_format_test.o \
        drm_framebuffer_test.o \
+       drm_managed_test.o \
        drm_mm_test.o \
        drm_modes_test.o \
        drm_plane_helper_test.o \

diff --git a/drivers/gpu/drm/tests/drm_managed_test.c b/drivers/gpu/drm/tests/drm_managed_test.c
new file mode 100644 (file)
index 0000000..1652dca
--- /dev/null
+++ b/drivers/gpu/drm/tests/drm_managed_test.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <drm/drm_drv.h>
+#include <drm/drm_kunit_helpers.h>
+#include <drm/drm_managed.h>
+
+#include <kunit/resource.h>
+
+#include <linux/device.h>
+
+/* Ought to be enough for anybody */
+#define TEST_TIMEOUT_MS        100
+
+struct managed_test_priv {
+       bool action_done;
+       wait_queue_head_t action_wq;
+};
+
+static void drm_action(struct drm_device *drm, void *ptr)
+{
+       struct managed_test_priv *priv = ptr;
+
+       priv->action_done = true;
+       wake_up_interruptible(&priv->action_wq);
+}
+
+static void drm_test_managed_run_action(struct kunit *test)
+{
+       struct managed_test_priv *priv;
+       struct drm_device *drm;
+       struct device *dev;
+       int ret;
+
+       priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
+       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv);
+       init_waitqueue_head(&priv->action_wq);
+
+       dev = drm_kunit_helper_alloc_device(test);
+       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dev);
+
+       drm = __drm_kunit_helper_alloc_drm_device(test, dev, sizeof(*drm), 0, DRIVER_MODESET);
+       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, drm);
+
+       ret = drmm_add_action_or_reset(drm, drm_action, priv);
+       KUNIT_EXPECT_EQ(test, ret, 0);
+
+       ret = drm_dev_register(drm, 0);
+       KUNIT_ASSERT_EQ(test, ret, 0);
+
+       drm_dev_unregister(drm);
+       drm_kunit_helper_free_device(test, dev);
+
+       ret = wait_event_interruptible_timeout(priv->action_wq, priv->action_done,
+                                              msecs_to_jiffies(TEST_TIMEOUT_MS));
+       KUNIT_EXPECT_GT(test, ret, 0);
+}
+
+static struct kunit_case drm_managed_tests[] = {
+       KUNIT_CASE(drm_test_managed_run_action),
+       {}
+};
+
+static struct kunit_suite drm_managed_test_suite = {
+       .name = "drm-test-managed",
+       .test_cases = drm_managed_tests
+};
+
+kunit_test_suite(drm_managed_test_suite);
+
+MODULE_AUTHOR("Maxime Ripard <maxime@cerno.tech>");
+MODULE_LICENSE("GPL");