linux-kernel - [PATCH v3 3/3] drm/tests: managed: Add a simple test for drmm_managed

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Date:   Mon, 11 Dec 2023 23:09:39 +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 v3 3/3] 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 | 29 ++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/gpu/drm/tests/drm_managed_test.c b/drivers/gpu/drm/tests/drm_managed_test.c
index 15bd2474440b5..ef5e784afbc6d 100644
--- a/drivers/gpu/drm/tests/drm_managed_test.c
+++ b/drivers/gpu/drm/tests/drm_managed_test.c
@@ -48,6 +48,34 @@ static void drm_test_managed_run_action(struct kunit *test)
 	KUNIT_EXPECT_GT_MSG(test, ret, 0, "Release action was not called");
 }
 
+/*
+ * The test verifies that the release action is called immediately when
+ * drmm_release_action is called and that it is not called for a second time
+ * when the device is released.
+ */
+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(priv->drm, 0);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	drmm_release_action(priv->drm, drm_action, priv);
+	KUNIT_EXPECT_TRUE_MSG(test, priv->action_done, "Release action was not called");
+	priv->action_done = false;
+
+	drm_dev_unregister(priv->drm);
+	drm_kunit_helper_free_device(test, priv->drm->dev);
+
+	ret = wait_event_interruptible_timeout(priv->action_wq, priv->action_done,
+					       msecs_to_jiffies(TEST_TIMEOUT_MS));
+	KUNIT_EXPECT_EQ_MSG(test, ret, 0, "Unexpected release action call during cleanup");
+}
+
 static int drm_managed_test_init(struct kunit *test)
 {
 	struct managed_test_priv *priv;
@@ -76,6 +104,7 @@ static int drm_managed_test_init(struct kunit *test)
 }
 
 static struct kunit_case drm_managed_tests[] = {
+	KUNIT_CASE(drm_test_managed_release_action),
 	KUNIT_CASE(drm_test_managed_run_action),
 	{}
 };
-- 
2.43.0