linux-kernel - [PATCH 2/2] drm/tests: managed: Add a simple test for drmm_managed

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Date:   Wed, 29 Nov 2023 23:14:12 +0100
From:   Michał Winiarski <michal.winiarski@...el.com>
To:     <intel-xe@...ts.freedesktop.org>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
CC:     Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Michal Wajdeczko <michal.wajdeczko@...el.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Maíra Canal <mcanal@...lia.com>,
        Michał Winiarski <michal.winiarski@...el.com>
Subject: [PATCH 2/2] drm/tests: managed: Add a simple test for drmm_managed_release

Add a simple test that checks whether the action is indeed called right
away and that it is not called on the final drm_dev_put().

Signed-off-by: Michał Winiarski <michal.winiarski@...el.com>
---
 drivers/gpu/drm/tests/drm_managed_test.c | 65 ++++++++++++++++++------
 1 file changed, 50 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/tests/drm_managed_test.c b/drivers/gpu/drm/tests/drm_managed_test.c
index 1652dca11d30c..a645ea42aee56 100644
--- a/drivers/gpu/drm/tests/drm_managed_test.c
+++ b/drivers/gpu/drm/tests/drm_managed_test.c
@@ -12,6 +12,8 @@
 #define TEST_TIMEOUT_MS	100
 
 struct managed_test_priv {
+	struct drm_device *drm;
+	struct device *dev;
 	bool action_done;
 	wait_queue_head_t action_wq;
 };
@@ -26,42 +28,75 @@ static void drm_action(struct drm_device *drm, void *ptr)
 
 static void drm_test_managed_run_action(struct kunit *test)
 {
-	struct managed_test_priv *priv;
-	struct drm_device *drm;
-	struct device *dev;
+	struct managed_test_priv *priv = test->priv;
 	int ret;
 
-	priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
-	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv);
-	init_waitqueue_head(&priv->action_wq);
+	ret = drmm_add_action_or_reset(priv->drm, drm_action, priv);
+	KUNIT_EXPECT_EQ(test, ret, 0);
 
-	dev = drm_kunit_helper_alloc_device(test);
-	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dev);
+	ret = drm_dev_register(priv->drm, 0);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	drm_dev_unregister(priv->drm);
+	drm_kunit_helper_free_device(test, priv->dev);
 
-	drm = __drm_kunit_helper_alloc_drm_device(test, dev, sizeof(*drm), 0, DRIVER_MODESET);
-	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, drm);
+	ret = wait_event_interruptible_timeout(priv->action_wq, priv->action_done,
+					       msecs_to_jiffies(TEST_TIMEOUT_MS));
+	KUNIT_EXPECT_GT(test, ret, 0);
+}
 
-	ret = drmm_add_action_or_reset(drm, drm_action, priv);
+static void drm_test_managed_release_action(struct kunit *test)
+{
+	struct managed_test_priv *priv = test->priv;
+	int ret;
+
+	ret = drmm_add_action_or_reset(priv->drm, drm_action, priv);
 	KUNIT_EXPECT_EQ(test, ret, 0);
 
-	ret = drm_dev_register(drm, 0);
+	ret = drm_dev_register(priv->drm, 0);
 	KUNIT_ASSERT_EQ(test, ret, 0);
 
-	drm_dev_unregister(drm);
-	drm_kunit_helper_free_device(test, dev);
+	drmm_release_action(priv->drm, drm_action, priv);
+	KUNIT_EXPECT_TRUE(test, priv->action_done);
+	priv->action_done = false;
+
+	drm_dev_unregister(priv->drm);
+	drm_kunit_helper_free_device(test, priv->dev);
 
 	ret = wait_event_interruptible_timeout(priv->action_wq, priv->action_done,
 					       msecs_to_jiffies(TEST_TIMEOUT_MS));
-	KUNIT_EXPECT_GT(test, ret, 0);
+	KUNIT_EXPECT_EQ(test, ret, 0);
+}
+
+static int drm_managed_test_init(struct kunit *test)
+{
+	struct managed_test_priv *priv;
+
+	priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv);
+	init_waitqueue_head(&priv->action_wq);
+
+	priv->dev = drm_kunit_helper_alloc_device(test);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->dev);
+
+	priv->drm = __drm_kunit_helper_alloc_drm_device(test, priv->dev, sizeof(*priv->drm),
+							0, DRIVER_MODESET);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->drm);
+
+	test->priv = priv;
+
+	return 0;
 }
 
 static struct kunit_case drm_managed_tests[] = {
 	KUNIT_CASE(drm_test_managed_run_action),
+	KUNIT_CASE(drm_test_managed_release_action),
 	{}
 };
 
 static struct kunit_suite drm_managed_test_suite = {
 	.name = "drm-test-managed",
+	.init = drm_managed_test_init,
 	.test_cases = drm_managed_tests
 };
 
-- 
2.43.0