// 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 {
        struct drm_device *drm;
        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);
}

/*
 * The test verifies that the release action is called when
 * drmm_release_action is called.
 */
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);
        ret = wait_event_interruptible_timeout(priv->action_wq, priv->action_done,
                                               msecs_to_jiffies(TEST_TIMEOUT_MS));
        KUNIT_EXPECT_GT(test, ret, 0);

        drm_dev_unregister(priv->drm);
        drm_kunit_helper_free_device(test, priv->drm->dev);
}

/*
 * 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(test, ret, 0);
}

static int drm_managed_test_init(struct kunit *test)
{
        struct managed_test_priv *priv;
        struct device *dev;

        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 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);

        test->priv = priv;

        return 0;
}

static struct kunit_case drm_managed_tests[] = {
        KUNIT_CASE(drm_test_managed_release_action),
        KUNIT_CASE(drm_test_managed_run_action),
        {}
};

static struct kunit_suite drm_managed_test_suite = {
        .name = "drm_managed",
        .init = drm_managed_test_init,
        .test_cases = drm_managed_tests
};

kunit_test_suite(drm_managed_test_suite);

MODULE_AUTHOR("Maxime Ripard <maxime@cerno.tech>");
MODULE_DESCRIPTION("KUnit DRM managed test suite");
MODULE_LICENSE("GPL");