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ec3d41c4 RR |
1 | #include <linux/virtio.h> |
2 | #include <linux/spinlock.h> | |
3 | #include <linux/virtio_config.h> | |
4 | ||
5 | static ssize_t device_show(struct device *_d, | |
6 | struct device_attribute *attr, char *buf) | |
7 | { | |
8 | struct virtio_device *dev = container_of(_d,struct virtio_device,dev); | |
9 | return sprintf(buf, "%hu", dev->id.device); | |
10 | } | |
11 | static ssize_t vendor_show(struct device *_d, | |
12 | struct device_attribute *attr, char *buf) | |
13 | { | |
14 | struct virtio_device *dev = container_of(_d,struct virtio_device,dev); | |
15 | return sprintf(buf, "%hu", dev->id.vendor); | |
16 | } | |
17 | static ssize_t status_show(struct device *_d, | |
18 | struct device_attribute *attr, char *buf) | |
19 | { | |
20 | struct virtio_device *dev = container_of(_d,struct virtio_device,dev); | |
21 | return sprintf(buf, "0x%08x", dev->config->get_status(dev)); | |
22 | } | |
23 | static struct device_attribute virtio_dev_attrs[] = { | |
24 | __ATTR_RO(device), | |
25 | __ATTR_RO(vendor), | |
26 | __ATTR_RO(status), | |
27 | __ATTR_NULL | |
28 | }; | |
29 | ||
30 | static inline int virtio_id_match(const struct virtio_device *dev, | |
31 | const struct virtio_device_id *id) | |
32 | { | |
33 | if (id->device != dev->id.device) | |
34 | return 0; | |
35 | ||
36 | return id->vendor == VIRTIO_DEV_ANY_ID || id->vendor != dev->id.vendor; | |
37 | } | |
38 | ||
39 | /* This looks through all the IDs a driver claims to support. If any of them | |
40 | * match, we return 1 and the kernel will call virtio_dev_probe(). */ | |
41 | static int virtio_dev_match(struct device *_dv, struct device_driver *_dr) | |
42 | { | |
43 | unsigned int i; | |
44 | struct virtio_device *dev = container_of(_dv,struct virtio_device,dev); | |
45 | const struct virtio_device_id *ids; | |
46 | ||
47 | ids = container_of(_dr, struct virtio_driver, driver)->id_table; | |
48 | for (i = 0; ids[i].device; i++) | |
49 | if (virtio_id_match(dev, &ids[i])) | |
50 | return 1; | |
51 | return 0; | |
52 | } | |
53 | ||
54 | static struct bus_type virtio_bus = { | |
55 | .name = "virtio", | |
56 | .match = virtio_dev_match, | |
57 | .dev_attrs = virtio_dev_attrs, | |
58 | }; | |
59 | ||
60 | static void add_status(struct virtio_device *dev, unsigned status) | |
61 | { | |
62 | dev->config->set_status(dev, dev->config->get_status(dev) | status); | |
63 | } | |
64 | ||
65 | static int virtio_dev_probe(struct device *_d) | |
66 | { | |
67 | int err; | |
68 | struct virtio_device *dev = container_of(_d,struct virtio_device,dev); | |
69 | struct virtio_driver *drv = container_of(dev->dev.driver, | |
70 | struct virtio_driver, driver); | |
71 | ||
72 | add_status(dev, VIRTIO_CONFIG_S_DRIVER); | |
73 | err = drv->probe(dev); | |
74 | if (err) | |
75 | add_status(dev, VIRTIO_CONFIG_S_FAILED); | |
76 | else | |
77 | add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK); | |
78 | return err; | |
79 | } | |
80 | ||
81 | int register_virtio_driver(struct virtio_driver *driver) | |
82 | { | |
83 | driver->driver.bus = &virtio_bus; | |
84 | driver->driver.probe = virtio_dev_probe; | |
85 | return driver_register(&driver->driver); | |
86 | } | |
87 | EXPORT_SYMBOL_GPL(register_virtio_driver); | |
88 | ||
89 | void unregister_virtio_driver(struct virtio_driver *driver) | |
90 | { | |
91 | driver_unregister(&driver->driver); | |
92 | } | |
93 | EXPORT_SYMBOL_GPL(unregister_virtio_driver); | |
94 | ||
95 | int register_virtio_device(struct virtio_device *dev) | |
96 | { | |
97 | int err; | |
98 | ||
99 | dev->dev.bus = &virtio_bus; | |
100 | sprintf(dev->dev.bus_id, "%u", dev->index); | |
101 | ||
102 | /* Acknowledge that we've seen the device. */ | |
103 | add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE); | |
104 | ||
105 | /* device_register() causes the bus infrastructure to look for a | |
106 | * matching driver. */ | |
107 | err = device_register(&dev->dev); | |
108 | if (err) | |
109 | add_status(dev, VIRTIO_CONFIG_S_FAILED); | |
110 | return err; | |
111 | } | |
112 | EXPORT_SYMBOL_GPL(register_virtio_device); | |
113 | ||
114 | void unregister_virtio_device(struct virtio_device *dev) | |
115 | { | |
116 | device_unregister(&dev->dev); | |
117 | } | |
118 | EXPORT_SYMBOL_GPL(unregister_virtio_device); | |
119 | ||
120 | int __virtio_config_val(struct virtio_device *vdev, | |
121 | u8 type, void *val, size_t size) | |
122 | { | |
123 | void *token; | |
124 | unsigned int len; | |
125 | ||
126 | token = vdev->config->find(vdev, type, &len); | |
127 | if (!token) | |
128 | return -ENOENT; | |
129 | ||
130 | if (len != size) | |
131 | return -EIO; | |
132 | ||
133 | vdev->config->get(vdev, token, val, size); | |
134 | return 0; | |
135 | } | |
136 | EXPORT_SYMBOL_GPL(__virtio_config_val); | |
137 | ||
138 | int virtio_use_bit(struct virtio_device *vdev, | |
139 | void *token, unsigned int len, unsigned int bitnum) | |
140 | { | |
141 | unsigned long bits[16]; | |
142 | ||
143 | /* This makes it convenient to pass-through find() results. */ | |
144 | if (!token) | |
145 | return 0; | |
146 | ||
147 | /* bit not in range of this bitfield? */ | |
148 | if (bitnum * 8 >= len / 2) | |
149 | return 0; | |
150 | ||
151 | /* Giant feature bitfields are silly. */ | |
152 | BUG_ON(len > sizeof(bits)); | |
153 | vdev->config->get(vdev, token, bits, len); | |
154 | ||
155 | if (!test_bit(bitnum, bits)) | |
156 | return 0; | |
157 | ||
158 | /* Set acknowledge bit, and write it back. */ | |
159 | set_bit(bitnum + len * 8 / 2, bits); | |
160 | vdev->config->set(vdev, token, bits, len); | |
161 | return 1; | |
162 | } | |
163 | EXPORT_SYMBOL_GPL(virtio_use_bit); | |
164 | ||
165 | static int virtio_init(void) | |
166 | { | |
167 | if (bus_register(&virtio_bus) != 0) | |
168 | panic("virtio bus registration failed"); | |
169 | return 0; | |
170 | } | |
171 | core_initcall(virtio_init); |