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, size: 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(root: 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(dev: 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(dev: 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(root: 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");
113

source code of linux/drivers/base/test/root-device-test.c