linux-kernel - Re: [PATCH v3 2/3] drm/tests: managed: Extract device initialization into test init

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Date: Fri, 15 Dec 2023 11:34:05 +0100
From: Maxime Ripard <mripard@...nel.org>
To: Michał Winiarski <michal.winiarski@...el.com>
Cc: intel-xe@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org, Rodrigo Vivi <rodrigo.vivi@...el.com>, 
	Michal Wajdeczko <michal.wajdeczko@...el.com>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	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>
Subject: Re: [PATCH v3 2/3] drm/tests: managed: Extract device initialization
 into test init

On Mon, Dec 11, 2023 at 11:09:38PM +0100, Michał Winiarski wrote:
> It simplifies the process of extending the test suite with additional
> test cases without unnecessary duplication.
> 
> Signed-off-by: Michał Winiarski <michal.winiarski@...el.com>
> ---
>  drivers/gpu/drm/tests/drm_managed_test.c | 51 +++++++++++++++++-------
>  1 file changed, 36 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..15bd2474440b5 100644
> --- a/drivers/gpu/drm/tests/drm_managed_test.c
> +++ b/drivers/gpu/drm/tests/drm_managed_test.c
> @@ -12,6 +12,7 @@
>  #define TEST_TIMEOUT_MS	100
>  
>  struct managed_test_priv {
> +	struct drm_device *drm;
>  	bool action_done;
>  	wait_queue_head_t action_wq;
>  };
> @@ -24,35 +25,54 @@ static void drm_action(struct drm_device *drm, void *ptr)
>  	wake_up_interruptible(&priv->action_wq);
>  }
>  
> +/*
> + * The test verifies that the release action is called automatically when the
> + * device is released.
> + */
>  static void drm_test_managed_run_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);
> +
> +	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_GT_MSG(test, ret, 0, "Release action was not called");

The addition of the message should be in a separate patch

> +}
> +
> +static int drm_managed_test_init(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);
> +	/*
> +	 * DRM device can't be embedded in priv, since priv->action_done needs
> +	 * to remain allocated beyond both parent device and drm_device
> +	 * lifetime.
> +	 */
> +	priv->drm = __drm_kunit_helper_alloc_drm_device(test, dev, sizeof(*priv->drm), 0,
> +							DRIVER_MODESET);
> +	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->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);
> +	init_waitqueue_head(&priv->action_wq);
>  
> -	drm_dev_unregister(drm);
> -	drm_kunit_helper_free_device(test, dev);
> +	test->priv = priv;
>  
> -	ret = wait_event_interruptible_timeout(priv->action_wq, priv->action_done,
> -					       msecs_to_jiffies(TEST_TIMEOUT_MS));
> -	KUNIT_EXPECT_GT(test, ret, 0);
> +	return 0;
>  }
>  
>  static struct kunit_case drm_managed_tests[] = {
> @@ -62,6 +82,7 @@ static struct kunit_case drm_managed_tests[] = {
>  
>  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
> 

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