linux-kernel - Re: [PATCH v2 10/17] drm/tests: Add a test for DRM managed actions

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Message-ID: <b48c4585-52b9-5311-5210-fd5679bda90f@igalia.com>
Date:   Mon, 28 Nov 2022 17:14:21 -0300
From:   Maíra Canal <mcanal@...lia.com>
To:     Maxime Ripard <maxime@...no.tech>, Daniel Vetter <daniel@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        David Airlie <airlied@...il.com>,
        Thomas Zimmermann <tzimmermann@...e.de>
Cc:     David Gow <davidgow@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Javier Martinez Canillas <javierm@...hat.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linaro-mm-sig@...ts.linaro.org,
        Brendan Higgins <brendan.higgins@...ux.dev>,
        linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com,
        linux-media@...r.kernel.org
Subject: Re: [PATCH v2 10/17] drm/tests: Add a test for DRM managed actions

On 11/28/22 11:53, Maxime Ripard wrote:
> DRM-managed actions are supposed to be ran whenever the device is
> released. Let's introduce a basic unit test to make sure it happens.
> 
> Reviewed-by: Javier Martinez Canillas <javierm@...hat.com>
> Signed-off-by: Maxime Ripard <maxime@...no.tech>

Reviewed-by: Maíra Canal <mcanal@...lia.com>

Best Regards,
- Maíra Canal

> ---
>  drivers/gpu/drm/tests/Makefile           |  1 +
>  drivers/gpu/drm/tests/drm_managed_test.c | 71 ++++++++++++++++++++++++++++++++
>  2 files changed, 72 insertions(+)
> 
> diff --git a/drivers/gpu/drm/tests/Makefile b/drivers/gpu/drm/tests/Makefile
> index 94fe546d937d..486053052ba9 100644
> --- a/drivers/gpu/drm/tests/Makefile
> +++ b/drivers/gpu/drm/tests/Makefile
> @@ -10,6 +10,7 @@ obj-$(CONFIG_DRM_KUNIT_TEST) += \
>  	drm_format_test.o \
>  	drm_framebuffer_test.o \
>  	drm_kunit_helpers.o \
> +	drm_managed_test.o \
>  	drm_mm_test.o \
>  	drm_modes_test.o \
>  	drm_plane_helper_test.o \
> diff --git a/drivers/gpu/drm/tests/drm_managed_test.c b/drivers/gpu/drm/tests/drm_managed_test.c
> new file mode 100644
> index 000000000000..1652dca11d30
> --- /dev/null
> +++ b/drivers/gpu/drm/tests/drm_managed_test.c
> @@ -0,0 +1,71 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#include <drm/drm_drv.h>
> +#include <drm/drm_kunit_helpers.h>
> +#include <drm/drm_managed.h>
> +
> +#include <kunit/resource.h>
> +
> +#include <linux/device.h>
> +
> +/* Ought to be enough for anybody */
> +#define TEST_TIMEOUT_MS	100
> +
> +struct managed_test_priv {
> +	bool action_done;
> +	wait_queue_head_t action_wq;
> +};
> +
> +static void drm_action(struct drm_device *drm, void *ptr)
> +{
> +	struct managed_test_priv *priv = ptr;
> +
> +	priv->action_done = true;
> +	wake_up_interruptible(&priv->action_wq);
> +}
> +
> +static void drm_test_managed_run_action(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);
> +
> +	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);
> +
> +	drm_dev_unregister(drm);
> +	drm_kunit_helper_free_device(test, dev);
> +
> +	ret = wait_event_interruptible_timeout(priv->action_wq, priv->action_done,
> +					       msecs_to_jiffies(TEST_TIMEOUT_MS));
> +	KUNIT_EXPECT_GT(test, ret, 0);
> +}
> +
> +static struct kunit_case drm_managed_tests[] = {
> +	KUNIT_CASE(drm_test_managed_run_action),
> +	{}
> +};
> +
> +static struct kunit_suite drm_managed_test_suite = {
> +	.name = "drm-test-managed",
> +	.test_cases = drm_managed_tests
> +};
> +
> +kunit_test_suite(drm_managed_test_suite);
> +
> +MODULE_AUTHOR("Maxime Ripard <maxime@...no.tech>");
> +MODULE_LICENSE("GPL");
>