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b94d5230 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/libnvdimm.h> | |
14 | #include <linux/export.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/device.h> | |
45def22c | 17 | #include <linux/mutex.h> |
b94d5230 DW |
18 | #include <linux/slab.h> |
19 | #include "nd-core.h" | |
20 | ||
e6dfb2de DW |
21 | LIST_HEAD(nvdimm_bus_list); |
22 | DEFINE_MUTEX(nvdimm_bus_list_mutex); | |
b94d5230 DW |
23 | static DEFINE_IDA(nd_ida); |
24 | ||
25 | static void nvdimm_bus_release(struct device *dev) | |
26 | { | |
27 | struct nvdimm_bus *nvdimm_bus; | |
28 | ||
29 | nvdimm_bus = container_of(dev, struct nvdimm_bus, dev); | |
30 | ida_simple_remove(&nd_ida, nvdimm_bus->id); | |
31 | kfree(nvdimm_bus); | |
32 | } | |
33 | ||
45def22c DW |
34 | struct nvdimm_bus *to_nvdimm_bus(struct device *dev) |
35 | { | |
36 | struct nvdimm_bus *nvdimm_bus; | |
37 | ||
38 | nvdimm_bus = container_of(dev, struct nvdimm_bus, dev); | |
39 | WARN_ON(nvdimm_bus->dev.release != nvdimm_bus_release); | |
40 | return nvdimm_bus; | |
41 | } | |
42 | EXPORT_SYMBOL_GPL(to_nvdimm_bus); | |
43 | ||
44 | struct nvdimm_bus_descriptor *to_nd_desc(struct nvdimm_bus *nvdimm_bus) | |
45 | { | |
46 | /* struct nvdimm_bus definition is private to libnvdimm */ | |
47 | return nvdimm_bus->nd_desc; | |
48 | } | |
49 | EXPORT_SYMBOL_GPL(to_nd_desc); | |
50 | ||
e6dfb2de DW |
51 | struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev) |
52 | { | |
53 | struct device *dev; | |
54 | ||
55 | for (dev = nd_dev; dev; dev = dev->parent) | |
56 | if (dev->release == nvdimm_bus_release) | |
57 | break; | |
58 | dev_WARN_ONCE(nd_dev, !dev, "invalid dev, not on nd bus\n"); | |
59 | if (dev) | |
60 | return to_nvdimm_bus(dev); | |
61 | return NULL; | |
62 | } | |
63 | ||
45def22c DW |
64 | static const char *nvdimm_bus_provider(struct nvdimm_bus *nvdimm_bus) |
65 | { | |
66 | struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; | |
67 | struct device *parent = nvdimm_bus->dev.parent; | |
68 | ||
69 | if (nd_desc->provider_name) | |
70 | return nd_desc->provider_name; | |
71 | else if (parent) | |
72 | return dev_name(parent); | |
73 | else | |
74 | return "unknown"; | |
75 | } | |
76 | ||
77 | static ssize_t provider_show(struct device *dev, | |
78 | struct device_attribute *attr, char *buf) | |
79 | { | |
80 | struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev); | |
81 | ||
82 | return sprintf(buf, "%s\n", nvdimm_bus_provider(nvdimm_bus)); | |
83 | } | |
84 | static DEVICE_ATTR_RO(provider); | |
85 | ||
86 | static struct attribute *nvdimm_bus_attributes[] = { | |
87 | &dev_attr_provider.attr, | |
88 | NULL, | |
89 | }; | |
90 | ||
91 | struct attribute_group nvdimm_bus_attribute_group = { | |
92 | .attrs = nvdimm_bus_attributes, | |
93 | }; | |
94 | EXPORT_SYMBOL_GPL(nvdimm_bus_attribute_group); | |
95 | ||
b94d5230 DW |
96 | struct nvdimm_bus *nvdimm_bus_register(struct device *parent, |
97 | struct nvdimm_bus_descriptor *nd_desc) | |
98 | { | |
99 | struct nvdimm_bus *nvdimm_bus; | |
100 | int rc; | |
101 | ||
102 | nvdimm_bus = kzalloc(sizeof(*nvdimm_bus), GFP_KERNEL); | |
103 | if (!nvdimm_bus) | |
104 | return NULL; | |
45def22c | 105 | INIT_LIST_HEAD(&nvdimm_bus->list); |
b94d5230 DW |
106 | nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL); |
107 | if (nvdimm_bus->id < 0) { | |
108 | kfree(nvdimm_bus); | |
109 | return NULL; | |
110 | } | |
111 | nvdimm_bus->nd_desc = nd_desc; | |
112 | nvdimm_bus->dev.parent = parent; | |
113 | nvdimm_bus->dev.release = nvdimm_bus_release; | |
45def22c | 114 | nvdimm_bus->dev.groups = nd_desc->attr_groups; |
b94d5230 DW |
115 | dev_set_name(&nvdimm_bus->dev, "ndbus%d", nvdimm_bus->id); |
116 | rc = device_register(&nvdimm_bus->dev); | |
117 | if (rc) { | |
118 | dev_dbg(&nvdimm_bus->dev, "registration failed: %d\n", rc); | |
45def22c | 119 | goto err; |
b94d5230 DW |
120 | } |
121 | ||
45def22c DW |
122 | rc = nvdimm_bus_create_ndctl(nvdimm_bus); |
123 | if (rc) | |
124 | goto err; | |
125 | ||
126 | mutex_lock(&nvdimm_bus_list_mutex); | |
127 | list_add_tail(&nvdimm_bus->list, &nvdimm_bus_list); | |
128 | mutex_unlock(&nvdimm_bus_list_mutex); | |
129 | ||
b94d5230 | 130 | return nvdimm_bus; |
45def22c DW |
131 | err: |
132 | put_device(&nvdimm_bus->dev); | |
133 | return NULL; | |
b94d5230 DW |
134 | } |
135 | EXPORT_SYMBOL_GPL(nvdimm_bus_register); | |
136 | ||
e6dfb2de DW |
137 | static int child_unregister(struct device *dev, void *data) |
138 | { | |
139 | /* | |
140 | * the singular ndctl class device per bus needs to be | |
141 | * "device_destroy"ed, so skip it here | |
142 | * | |
143 | * i.e. remove classless children | |
144 | */ | |
145 | if (dev->class) | |
146 | /* pass */; | |
147 | else | |
148 | device_unregister(dev); | |
149 | return 0; | |
150 | } | |
151 | ||
b94d5230 DW |
152 | void nvdimm_bus_unregister(struct nvdimm_bus *nvdimm_bus) |
153 | { | |
154 | if (!nvdimm_bus) | |
155 | return; | |
45def22c DW |
156 | |
157 | mutex_lock(&nvdimm_bus_list_mutex); | |
158 | list_del_init(&nvdimm_bus->list); | |
159 | mutex_unlock(&nvdimm_bus_list_mutex); | |
160 | ||
e6dfb2de | 161 | device_for_each_child(&nvdimm_bus->dev, NULL, child_unregister); |
45def22c DW |
162 | nvdimm_bus_destroy_ndctl(nvdimm_bus); |
163 | ||
b94d5230 DW |
164 | device_unregister(&nvdimm_bus->dev); |
165 | } | |
166 | EXPORT_SYMBOL_GPL(nvdimm_bus_unregister); | |
167 | ||
45def22c DW |
168 | static __init int libnvdimm_init(void) |
169 | { | |
170 | return nvdimm_bus_init(); | |
171 | } | |
172 | ||
173 | static __exit void libnvdimm_exit(void) | |
174 | { | |
175 | WARN_ON(!list_empty(&nvdimm_bus_list)); | |
176 | nvdimm_bus_exit(); | |
177 | } | |
178 | ||
b94d5230 DW |
179 | MODULE_LICENSE("GPL v2"); |
180 | MODULE_AUTHOR("Intel Corporation"); | |
45def22c DW |
181 | subsys_initcall(libnvdimm_init); |
182 | module_exit(libnvdimm_exit); |