This source file includes following definitions.
- release_device
- iommu_dev_init
- iommu_device_sysfs_add
- iommu_device_sysfs_remove
- iommu_device_link
- iommu_device_unlink
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8
9 #include <linux/device.h>
10 #include <linux/iommu.h>
11 #include <linux/init.h>
12 #include <linux/slab.h>
13
14
15
16
17
18 static struct attribute *devices_attr[] = {
19 NULL,
20 };
21
22 static const struct attribute_group devices_attr_group = {
23 .name = "devices",
24 .attrs = devices_attr,
25 };
26
27 static const struct attribute_group *dev_groups[] = {
28 &devices_attr_group,
29 NULL,
30 };
31
32 static void release_device(struct device *dev)
33 {
34 kfree(dev);
35 }
36
37 static struct class iommu_class = {
38 .name = "iommu",
39 .dev_release = release_device,
40 .dev_groups = dev_groups,
41 };
42
43 static int __init iommu_dev_init(void)
44 {
45 return class_register(&iommu_class);
46 }
47 postcore_initcall(iommu_dev_init);
48
49
50
51
52
53
54 int iommu_device_sysfs_add(struct iommu_device *iommu,
55 struct device *parent,
56 const struct attribute_group **groups,
57 const char *fmt, ...)
58 {
59 va_list vargs;
60 int ret;
61
62 iommu->dev = kzalloc(sizeof(*iommu->dev), GFP_KERNEL);
63 if (!iommu->dev)
64 return -ENOMEM;
65
66 device_initialize(iommu->dev);
67
68 iommu->dev->class = &iommu_class;
69 iommu->dev->parent = parent;
70 iommu->dev->groups = groups;
71
72 va_start(vargs, fmt);
73 ret = kobject_set_name_vargs(&iommu->dev->kobj, fmt, vargs);
74 va_end(vargs);
75 if (ret)
76 goto error;
77
78 ret = device_add(iommu->dev);
79 if (ret)
80 goto error;
81
82 dev_set_drvdata(iommu->dev, iommu);
83
84 return 0;
85
86 error:
87 put_device(iommu->dev);
88 return ret;
89 }
90
91 void iommu_device_sysfs_remove(struct iommu_device *iommu)
92 {
93 dev_set_drvdata(iommu->dev, NULL);
94 device_unregister(iommu->dev);
95 iommu->dev = NULL;
96 }
97
98
99
100
101
102
103 int iommu_device_link(struct iommu_device *iommu, struct device *link)
104 {
105 int ret;
106
107 if (!iommu || IS_ERR(iommu))
108 return -ENODEV;
109
110 ret = sysfs_add_link_to_group(&iommu->dev->kobj, "devices",
111 &link->kobj, dev_name(link));
112 if (ret)
113 return ret;
114
115 ret = sysfs_create_link_nowarn(&link->kobj, &iommu->dev->kobj, "iommu");
116 if (ret)
117 sysfs_remove_link_from_group(&iommu->dev->kobj, "devices",
118 dev_name(link));
119
120 return ret;
121 }
122
123 void iommu_device_unlink(struct iommu_device *iommu, struct device *link)
124 {
125 if (!iommu || IS_ERR(iommu))
126 return;
127
128 sysfs_remove_link(&link->kobj, "iommu");
129 sysfs_remove_link_from_group(&iommu->dev->kobj, "devices", dev_name(link));
130 }