linux-kernel - Re: [PATCH v2 3/3] drm/tests: managed: Add a simple test for drmm_managed

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Message-ID: <okubt4juvgbya5ybtfhozaczqvjhzqrtz3ltw4vylbmme5dzff@27tazbke5j25>
Date:   Tue, 5 Dec 2023 14:50:22 +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 v2 3/3] drm/tests: managed: Add a simple test for
 drmm_managed_release

Hi,

Thanks for the rework

On Tue, Dec 05, 2023 at 02:22:10AM +0100, Michał Winiarski wrote:
> 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 | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/drivers/gpu/drm/tests/drm_managed_test.c b/drivers/gpu/drm/tests/drm_managed_test.c
> index cabe6360aef71..8dfbea21c35c5 100644
> --- a/drivers/gpu/drm/tests/drm_managed_test.c
> +++ b/drivers/gpu/drm/tests/drm_managed_test.c
> @@ -44,6 +44,29 @@ static void drm_test_managed_run_action(struct kunit *test)
>  	KUNIT_EXPECT_GT(test, ret, 0);
>  }
>  

We should have a description of the intent of the test here.

> +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(test, priv->action_done);
> +	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(test, ret, 0);

This tests that we have reached the timeout, thus the action never ran.

It's not clear to me what your intent is here.

This test is:

  - Registering an action
  - Registering the DRM device
  - Calling drmm_release_action on the previously registered action
  - Checking that the action has been run
  - Clearing the flag saying the action has been run
  - Unregistering the DRM device
  - Freeing the DRM device
  - Waiting for the action to run, but expecting it to never do?

I guess something like

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_ASSERT_EQ(test, ret, 0);

	KUNIT_ASSERT_FALSE(test, priv->action_done);

	drmm_release_action(&priv->drm, drm_action, priv);
	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_TRUE(test, priv->action_done);
}

would be enough?

> +}
> +
>  static int drm_managed_test_init(struct kunit *test)
>  {
>  	struct managed_test_priv *priv;
> @@ -65,6 +88,7 @@ static int drm_managed_test_init(struct kunit *test)
>  
>  static struct kunit_case drm_managed_tests[] = {
>  	KUNIT_CASE(drm_test_managed_run_action),
> +	KUNIT_CASE(drm_test_managed_release_action),

Also, tests should be organized by alphabetical order

Maxime

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