1// SPDX-License-Identifier: GPL-2.0
  2// Copyright 2023 Maxime Ripard <mripard@kernel.org>
  3
  4#include <kunit/resource.h>
  5
  6#include <linux/device.h>
  7
  8#define DEVICE_NAME "test"
  9
 10struct test_priv {
 11	bool probe_done;
 12	bool release_done;
 13	wait_queue_head_t release_wq;
 14	struct device *dev;
 15};
 16
 17static int root_device_devm_init(struct kunit *test)
 18{
 19	struct test_priv *priv;
 20
 21	priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
 22	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv);
 23	init_waitqueue_head(&priv->release_wq);
 24
 25	test->priv = priv;
 26
 27	return 0;
 28}
 29
 30static void devm_device_action(void *ptr)
 31{
 32	struct test_priv *priv = ptr;
 33
 34	priv->release_done = true;
 35	wake_up_interruptible(&priv->release_wq);
 36}
 37
 38#define RELEASE_TIMEOUT_MS	100
 39
 40/*
 41 * Tests that a bus-less, non-probed device will run its device-managed
 42 * actions when unregistered.
 43 */
 44static void root_device_devm_register_unregister_test(struct kunit *test)
 45{
 46	struct test_priv *priv = test->priv;
 47	int ret;
 48
 49	priv->dev = root_device_register(DEVICE_NAME);
 50	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->dev);
 51
 52	ret = devm_add_action_or_reset(priv->dev, devm_device_action, priv);
 53	KUNIT_ASSERT_EQ(test, ret, 0);
 54
 55	root_device_unregister(priv->dev);
 56
 57	ret = wait_event_interruptible_timeout(priv->release_wq, priv->release_done,
 58					       msecs_to_jiffies(RELEASE_TIMEOUT_MS));
 59	KUNIT_EXPECT_GT(test, ret, 0);
 60}
 61
 62static void devm_put_device_action(void *ptr)
 63{
 64	struct test_priv *priv = ptr;
 65
 66	put_device(priv->dev);
 67	priv->release_done = true;
 68	wake_up_interruptible(&priv->release_wq);
 69}
 70
 71/*
 72 * Tests that a bus-less, non-probed device will run its device-managed
 73 * actions when unregistered, even if someone still holds a reference to
 74 * it.
 75 */
 76static void root_device_devm_register_get_unregister_with_devm_test(struct kunit *test)
 77{
 78	struct test_priv *priv = test->priv;
 79	int ret;
 80
 81	priv->dev = root_device_register(DEVICE_NAME);
 82	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->dev);
 83
 84	get_device(priv->dev);
 85
 86	ret = devm_add_action_or_reset(priv->dev, devm_put_device_action, priv);
 87	KUNIT_ASSERT_EQ(test, ret, 0);
 88
 89	root_device_unregister(priv->dev);
 90
 91	ret = wait_event_interruptible_timeout(priv->release_wq, priv->release_done,
 92					       msecs_to_jiffies(RELEASE_TIMEOUT_MS));
 93	KUNIT_EXPECT_GT(test, ret, 0);
 94}
 95
 96static struct kunit_case root_device_devm_tests[] = {
 97	KUNIT_CASE(root_device_devm_register_unregister_test),
 98	KUNIT_CASE(root_device_devm_register_get_unregister_with_devm_test),
 99	{}
100};
101
102static struct kunit_suite root_device_devm_test_suite = {
103	.name = "root-device-devm",
104	.init = root_device_devm_init,
105	.test_cases = root_device_devm_tests,
106};
107
108kunit_test_suite(root_device_devm_test_suite);
109
110MODULE_DESCRIPTION("Test module for root devices");
111MODULE_AUTHOR("Maxime Ripard <mripard@kernel.org>");
112MODULE_LICENSE("GPL");