Commit | Line | Data |
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f938d2c8 RR |
1 | /*P:050 Lguest guests use a very simple bus for devices. It's a simple array |
2 | * of device descriptors contained just above the top of normal memory. The | |
3 | * lguest bus is 80% tedious boilerplate code. :*/ | |
07ad157f RR |
4 | #include <linux/init.h> |
5 | #include <linux/bootmem.h> | |
6 | #include <linux/lguest_bus.h> | |
7 | #include <asm/io.h> | |
8 | ||
9 | static ssize_t type_show(struct device *_dev, | |
10 | struct device_attribute *attr, char *buf) | |
11 | { | |
12 | struct lguest_device *dev = container_of(_dev,struct lguest_device,dev); | |
13 | return sprintf(buf, "%hu", lguest_devices[dev->index].type); | |
14 | } | |
15 | static ssize_t features_show(struct device *_dev, | |
16 | struct device_attribute *attr, char *buf) | |
17 | { | |
18 | struct lguest_device *dev = container_of(_dev,struct lguest_device,dev); | |
19 | return sprintf(buf, "%hx", lguest_devices[dev->index].features); | |
20 | } | |
21 | static ssize_t pfn_show(struct device *_dev, | |
22 | struct device_attribute *attr, char *buf) | |
23 | { | |
24 | struct lguest_device *dev = container_of(_dev,struct lguest_device,dev); | |
25 | return sprintf(buf, "%u", lguest_devices[dev->index].pfn); | |
26 | } | |
27 | static ssize_t status_show(struct device *_dev, | |
28 | struct device_attribute *attr, char *buf) | |
29 | { | |
30 | struct lguest_device *dev = container_of(_dev,struct lguest_device,dev); | |
31 | return sprintf(buf, "%hx", lguest_devices[dev->index].status); | |
32 | } | |
33 | static ssize_t status_store(struct device *_dev, struct device_attribute *attr, | |
34 | const char *buf, size_t count) | |
35 | { | |
36 | struct lguest_device *dev = container_of(_dev,struct lguest_device,dev); | |
37 | if (sscanf(buf, "%hi", &lguest_devices[dev->index].status) != 1) | |
38 | return -EINVAL; | |
39 | return count; | |
40 | } | |
41 | static struct device_attribute lguest_dev_attrs[] = { | |
42 | __ATTR_RO(type), | |
43 | __ATTR_RO(features), | |
44 | __ATTR_RO(pfn), | |
45 | __ATTR(status, 0644, status_show, status_store), | |
46 | __ATTR_NULL | |
47 | }; | |
48 | ||
49 | static int lguest_dev_match(struct device *_dev, struct device_driver *_drv) | |
50 | { | |
51 | struct lguest_device *dev = container_of(_dev,struct lguest_device,dev); | |
52 | struct lguest_driver *drv = container_of(_drv,struct lguest_driver,drv); | |
53 | ||
54 | return (drv->device_type == lguest_devices[dev->index].type); | |
55 | } | |
56 | ||
57 | struct lguest_bus { | |
58 | struct bus_type bus; | |
59 | struct device dev; | |
60 | }; | |
61 | ||
62 | static struct lguest_bus lguest_bus = { | |
63 | .bus = { | |
64 | .name = "lguest", | |
65 | .match = lguest_dev_match, | |
66 | .dev_attrs = lguest_dev_attrs, | |
67 | }, | |
68 | .dev = { | |
69 | .parent = NULL, | |
70 | .bus_id = "lguest", | |
71 | } | |
72 | }; | |
73 | ||
74 | static int lguest_dev_probe(struct device *_dev) | |
75 | { | |
76 | int ret; | |
77 | struct lguest_device *dev = container_of(_dev,struct lguest_device,dev); | |
78 | struct lguest_driver *drv = container_of(dev->dev.driver, | |
79 | struct lguest_driver, drv); | |
80 | ||
81 | lguest_devices[dev->index].status |= LGUEST_DEVICE_S_DRIVER; | |
82 | ret = drv->probe(dev); | |
83 | if (ret == 0) | |
84 | lguest_devices[dev->index].status |= LGUEST_DEVICE_S_DRIVER_OK; | |
85 | return ret; | |
86 | } | |
87 | ||
88 | int register_lguest_driver(struct lguest_driver *drv) | |
89 | { | |
90 | if (!lguest_devices) | |
91 | return 0; | |
92 | ||
93 | drv->drv.bus = &lguest_bus.bus; | |
94 | drv->drv.name = drv->name; | |
95 | drv->drv.owner = drv->owner; | |
96 | drv->drv.probe = lguest_dev_probe; | |
97 | ||
98 | return driver_register(&drv->drv); | |
99 | } | |
100 | EXPORT_SYMBOL_GPL(register_lguest_driver); | |
101 | ||
102 | static void add_lguest_device(unsigned int index) | |
103 | { | |
104 | struct lguest_device *new; | |
105 | ||
106 | lguest_devices[index].status |= LGUEST_DEVICE_S_ACKNOWLEDGE; | |
107 | new = kmalloc(sizeof(struct lguest_device), GFP_KERNEL); | |
108 | if (!new) { | |
109 | printk(KERN_EMERG "Cannot allocate lguest device %u\n", index); | |
110 | lguest_devices[index].status |= LGUEST_DEVICE_S_FAILED; | |
111 | return; | |
112 | } | |
113 | ||
114 | new->index = index; | |
115 | new->private = NULL; | |
116 | memset(&new->dev, 0, sizeof(new->dev)); | |
117 | new->dev.parent = &lguest_bus.dev; | |
118 | new->dev.bus = &lguest_bus.bus; | |
119 | sprintf(new->dev.bus_id, "%u", index); | |
120 | if (device_register(&new->dev) != 0) { | |
121 | printk(KERN_EMERG "Cannot register lguest device %u\n", index); | |
122 | lguest_devices[index].status |= LGUEST_DEVICE_S_FAILED; | |
123 | kfree(new); | |
124 | } | |
125 | } | |
126 | ||
127 | static void scan_devices(void) | |
128 | { | |
129 | unsigned int i; | |
130 | ||
131 | for (i = 0; i < LGUEST_MAX_DEVICES; i++) | |
132 | if (lguest_devices[i].type) | |
133 | add_lguest_device(i); | |
134 | } | |
135 | ||
136 | static int __init lguest_bus_init(void) | |
137 | { | |
138 | if (strcmp(paravirt_ops.name, "lguest") != 0) | |
139 | return 0; | |
140 | ||
141 | /* Devices are in page above top of "normal" mem. */ | |
142 | lguest_devices = lguest_map(max_pfn<<PAGE_SHIFT, 1); | |
143 | ||
144 | if (bus_register(&lguest_bus.bus) != 0 | |
145 | || device_register(&lguest_bus.dev) != 0) | |
146 | panic("lguest bus registration failed"); | |
147 | ||
148 | scan_devices(); | |
149 | return 0; | |
150 | } | |
151 | postcore_initcall(lguest_bus_init); |