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3d88002e DW |
1 | /* |
2 | * Copyright(c) 2013-2015 Intel Corporation. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of version 2 of the GNU General Public License as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | */ | |
13 | #include <linux/module.h> | |
14 | #include <linux/device.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/nd.h> | |
17 | #include "nd.h" | |
18 | ||
19 | static void namespace_io_release(struct device *dev) | |
20 | { | |
21 | struct nd_namespace_io *nsio = to_nd_namespace_io(dev); | |
22 | ||
23 | kfree(nsio); | |
24 | } | |
25 | ||
26 | static struct device_type namespace_io_device_type = { | |
27 | .name = "nd_namespace_io", | |
28 | .release = namespace_io_release, | |
29 | }; | |
30 | ||
31 | static ssize_t nstype_show(struct device *dev, | |
32 | struct device_attribute *attr, char *buf) | |
33 | { | |
34 | struct nd_region *nd_region = to_nd_region(dev->parent); | |
35 | ||
36 | return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region)); | |
37 | } | |
38 | static DEVICE_ATTR_RO(nstype); | |
39 | ||
40 | static struct attribute *nd_namespace_attributes[] = { | |
41 | &dev_attr_nstype.attr, | |
42 | NULL, | |
43 | }; | |
44 | ||
45 | static struct attribute_group nd_namespace_attribute_group = { | |
46 | .attrs = nd_namespace_attributes, | |
47 | }; | |
48 | ||
49 | static const struct attribute_group *nd_namespace_attribute_groups[] = { | |
50 | &nd_device_attribute_group, | |
51 | &nd_namespace_attribute_group, | |
52 | NULL, | |
53 | }; | |
54 | ||
55 | static struct device **create_namespace_io(struct nd_region *nd_region) | |
56 | { | |
57 | struct nd_namespace_io *nsio; | |
58 | struct device *dev, **devs; | |
59 | struct resource *res; | |
60 | ||
61 | nsio = kzalloc(sizeof(*nsio), GFP_KERNEL); | |
62 | if (!nsio) | |
63 | return NULL; | |
64 | ||
65 | devs = kcalloc(2, sizeof(struct device *), GFP_KERNEL); | |
66 | if (!devs) { | |
67 | kfree(nsio); | |
68 | return NULL; | |
69 | } | |
70 | ||
71 | dev = &nsio->dev; | |
72 | dev->type = &namespace_io_device_type; | |
73 | dev->parent = &nd_region->dev; | |
74 | res = &nsio->res; | |
75 | res->name = dev_name(&nd_region->dev); | |
76 | res->flags = IORESOURCE_MEM; | |
77 | res->start = nd_region->ndr_start; | |
78 | res->end = res->start + nd_region->ndr_size - 1; | |
79 | ||
80 | devs[0] = dev; | |
81 | return devs; | |
82 | } | |
83 | ||
84 | int nd_region_register_namespaces(struct nd_region *nd_region, int *err) | |
85 | { | |
86 | struct device **devs = NULL; | |
87 | int i; | |
88 | ||
89 | *err = 0; | |
90 | switch (nd_region_to_nstype(nd_region)) { | |
91 | case ND_DEVICE_NAMESPACE_IO: | |
92 | devs = create_namespace_io(nd_region); | |
93 | break; | |
94 | default: | |
95 | break; | |
96 | } | |
97 | ||
98 | if (!devs) | |
99 | return -ENODEV; | |
100 | ||
101 | for (i = 0; devs[i]; i++) { | |
102 | struct device *dev = devs[i]; | |
103 | ||
104 | dev_set_name(dev, "namespace%d.%d", nd_region->id, i); | |
105 | dev->groups = nd_namespace_attribute_groups; | |
106 | nd_device_register(dev); | |
107 | } | |
108 | kfree(devs); | |
109 | ||
110 | return i; | |
111 | } |