Re: [PATCH v2 3/3] drm/tests: managed: Add a simple test for drmm_managed_release

[Maxime Ripard]

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.winiar...@intel.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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