1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
// SPDX-License-Identifier: GPL-2.0
/*
* KUnit-managed device implementation
*
* Implementation of struct kunit_device helpers for fake devices whose
* lifecycle is managed by KUnit.
*
* Copyright (C) 2023, Google LLC.
* Author: David Gow <davidgow@google.com>
*/
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <kunit/test.h>
#include <kunit/device.h>
#include <kunit/resource.h>
#include "device-impl.h"
/* Wrappers for use with kunit_add_action() */
KUNIT_DEFINE_ACTION_WRAPPER(device_unregister_wrapper, device_unregister, struct device *);
KUNIT_DEFINE_ACTION_WRAPPER(driver_unregister_wrapper, driver_unregister, struct device_driver *);
/* The root device for the KUnit bus, parent of all kunit_devices. */
static struct device *kunit_bus_device;
/* A device owned by a KUnit test. */
struct kunit_device {
struct device dev;
/* The KUnit test which owns this device. */
struct kunit *owner;
/* If the driver is managed by KUnit and unique to this device. */
const struct device_driver *driver;
};
#define to_kunit_device(d) container_of_const(d, struct kunit_device, dev)
static const struct bus_type kunit_bus_type = {
.name = "kunit",
};
/* Register the 'kunit_bus' used for fake devices. */
int kunit_bus_init(void)
{
int error;
kunit_bus_device = root_device_register("kunit");
if (IS_ERR(kunit_bus_device))
return PTR_ERR(kunit_bus_device);
error = bus_register(&kunit_bus_type);
if (error)
root_device_unregister(kunit_bus_device);
return error;
}
/* Unregister the 'kunit_bus' in case the KUnit module is unloaded. */
void kunit_bus_shutdown(void)
{
/* Make sure the bus exists before we unregister it. */
if (IS_ERR_OR_NULL(kunit_bus_device))
return;
bus_unregister(&kunit_bus_type);
root_device_unregister(kunit_bus_device);
kunit_bus_device = NULL;
}
/* Release a 'fake' KUnit device. */
static void kunit_device_release(struct device *d)
{
kfree(to_kunit_device(d));
}
/*
* Create and register a KUnit-managed struct device_driver on the kunit_bus.
* Returns an error pointer on failure.
*/
struct device_driver *kunit_driver_create(struct kunit *test, const char *name)
{
struct device_driver *driver;
int err = -ENOMEM;
driver = kunit_kzalloc(test, sizeof(*driver), GFP_KERNEL);
if (!driver)
return ERR_PTR(err);
driver->name = name;
driver->bus = &kunit_bus_type;
driver->owner = THIS_MODULE;
err = driver_register(driver);
if (err) {
kunit_kfree(test, driver);
return ERR_PTR(err);
}
kunit_add_action(test, driver_unregister_wrapper, driver);
return driver;
}
EXPORT_SYMBOL_GPL(kunit_driver_create);
/* Helper which creates a kunit_device, attaches it to the kunit_bus*/
static struct kunit_device *kunit_device_register_internal(struct kunit *test,
const char *name,
const struct device_driver *drv)
{
struct kunit_device *kunit_dev;
int err = -ENOMEM;
kunit_dev = kzalloc(sizeof(*kunit_dev), GFP_KERNEL);
if (!kunit_dev)
return ERR_PTR(err);
kunit_dev->owner = test;
err = dev_set_name(&kunit_dev->dev, "%s.%s", test->name, name);
if (err) {
kfree(kunit_dev);
return ERR_PTR(err);
}
kunit_dev->dev.release = kunit_device_release;
kunit_dev->dev.bus = &kunit_bus_type;
kunit_dev->dev.parent = kunit_bus_device;
err = device_register(&kunit_dev->dev);
if (err) {
put_device(&kunit_dev->dev);
return ERR_PTR(err);
}
kunit_dev->dev.dma_mask = &kunit_dev->dev.coherent_dma_mask;
kunit_dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
kunit_add_action(test, device_unregister_wrapper, &kunit_dev->dev);
return kunit_dev;
}
/*
* Create and register a new KUnit-managed device, using the user-supplied device_driver.
* On failure, returns an error pointer.
*/
struct device *kunit_device_register_with_driver(struct kunit *test,
const char *name,
const struct device_driver *drv)
{
struct kunit_device *kunit_dev = kunit_device_register_internal(test, name, drv);
if (IS_ERR_OR_NULL(kunit_dev))
return ERR_CAST(kunit_dev);
return &kunit_dev->dev;
}
EXPORT_SYMBOL_GPL(kunit_device_register_with_driver);
/*
* Create and register a new KUnit-managed device, including a matching device_driver.
* On failure, returns an error pointer.
*/
struct device *kunit_device_register(struct kunit *test, const char *name)
{
struct device_driver *drv;
struct kunit_device *dev;
drv = kunit_driver_create(test, name);
if (IS_ERR(drv))
return ERR_CAST(drv);
dev = kunit_device_register_internal(test, name, drv);
if (IS_ERR(dev)) {
kunit_release_action(test, driver_unregister_wrapper, (void *)drv);
return ERR_CAST(dev);
}
/* Request the driver be freed. */
dev->driver = drv;
return &dev->dev;
}
EXPORT_SYMBOL_GPL(kunit_device_register);
/* Unregisters a KUnit-managed device early (including the driver, if automatically created). */
void kunit_device_unregister(struct kunit *test, struct device *dev)
{
const struct device_driver *driver = to_kunit_device(dev)->driver;
kunit_release_action(test, device_unregister_wrapper, dev);
if (driver)
kunit_release_action(test, driver_unregister_wrapper, (void *)driver);
}
EXPORT_SYMBOL_GPL(kunit_device_unregister);
|
