Commit | Line | Data |
---|---|---|
cd03412a DW |
1 | /* |
2 | * Copyright(c) 2013-2016 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/device.h> | |
14 | #include <linux/sizes.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/mm.h> | |
17 | #include "nd-core.h" | |
c5ed9268 | 18 | #include "pfn.h" |
cd03412a DW |
19 | #include "nd.h" |
20 | ||
21 | static void nd_dax_release(struct device *dev) | |
22 | { | |
23 | struct nd_region *nd_region = to_nd_region(dev->parent); | |
24 | struct nd_dax *nd_dax = to_nd_dax(dev); | |
25 | struct nd_pfn *nd_pfn = &nd_dax->nd_pfn; | |
26 | ||
27 | dev_dbg(dev, "%s\n", __func__); | |
28 | nd_detach_ndns(dev, &nd_pfn->ndns); | |
29 | ida_simple_remove(&nd_region->dax_ida, nd_pfn->id); | |
30 | kfree(nd_pfn->uuid); | |
31 | kfree(nd_dax); | |
32 | } | |
33 | ||
34 | static struct device_type nd_dax_device_type = { | |
35 | .name = "nd_dax", | |
36 | .release = nd_dax_release, | |
37 | }; | |
38 | ||
39 | bool is_nd_dax(struct device *dev) | |
40 | { | |
41 | return dev ? dev->type == &nd_dax_device_type : false; | |
42 | } | |
43 | EXPORT_SYMBOL(is_nd_dax); | |
44 | ||
45 | struct nd_dax *to_nd_dax(struct device *dev) | |
46 | { | |
47 | struct nd_dax *nd_dax = container_of(dev, struct nd_dax, nd_pfn.dev); | |
48 | ||
49 | WARN_ON(!is_nd_dax(dev)); | |
50 | return nd_dax; | |
51 | } | |
52 | EXPORT_SYMBOL(to_nd_dax); | |
53 | ||
54 | static const struct attribute_group *nd_dax_attribute_groups[] = { | |
55 | &nd_pfn_attribute_group, | |
56 | &nd_device_attribute_group, | |
57 | &nd_numa_attribute_group, | |
58 | NULL, | |
59 | }; | |
60 | ||
61 | static struct nd_dax *nd_dax_alloc(struct nd_region *nd_region) | |
62 | { | |
63 | struct nd_pfn *nd_pfn; | |
64 | struct nd_dax *nd_dax; | |
65 | struct device *dev; | |
66 | ||
67 | nd_dax = kzalloc(sizeof(*nd_dax), GFP_KERNEL); | |
68 | if (!nd_dax) | |
69 | return NULL; | |
70 | ||
71 | nd_pfn = &nd_dax->nd_pfn; | |
72 | nd_pfn->id = ida_simple_get(&nd_region->dax_ida, 0, 0, GFP_KERNEL); | |
73 | if (nd_pfn->id < 0) { | |
74 | kfree(nd_dax); | |
75 | return NULL; | |
76 | } | |
77 | ||
78 | dev = &nd_pfn->dev; | |
79 | dev_set_name(dev, "dax%d.%d", nd_region->id, nd_pfn->id); | |
80 | dev->groups = nd_dax_attribute_groups; | |
81 | dev->type = &nd_dax_device_type; | |
82 | dev->parent = &nd_region->dev; | |
83 | ||
84 | return nd_dax; | |
85 | } | |
86 | ||
87 | struct device *nd_dax_create(struct nd_region *nd_region) | |
88 | { | |
89 | struct device *dev = NULL; | |
90 | struct nd_dax *nd_dax; | |
91 | ||
92 | if (!is_nd_pmem(&nd_region->dev)) | |
93 | return NULL; | |
94 | ||
95 | nd_dax = nd_dax_alloc(nd_region); | |
96 | if (nd_dax) | |
97 | dev = nd_pfn_devinit(&nd_dax->nd_pfn, NULL); | |
98 | __nd_device_register(dev); | |
99 | return dev; | |
100 | } | |
c5ed9268 DW |
101 | |
102 | int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns) | |
103 | { | |
104 | int rc; | |
105 | struct nd_dax *nd_dax; | |
106 | struct device *dax_dev; | |
107 | struct nd_pfn *nd_pfn; | |
108 | struct nd_pfn_sb *pfn_sb; | |
109 | struct nd_region *nd_region = to_nd_region(ndns->dev.parent); | |
110 | ||
111 | if (ndns->force_raw) | |
112 | return -ENODEV; | |
113 | ||
114 | nvdimm_bus_lock(&ndns->dev); | |
115 | nd_dax = nd_dax_alloc(nd_region); | |
116 | nd_pfn = &nd_dax->nd_pfn; | |
117 | dax_dev = nd_pfn_devinit(nd_pfn, ndns); | |
118 | nvdimm_bus_unlock(&ndns->dev); | |
119 | if (!dax_dev) | |
120 | return -ENOMEM; | |
121 | pfn_sb = devm_kzalloc(dev, sizeof(*pfn_sb), GFP_KERNEL); | |
122 | nd_pfn->pfn_sb = pfn_sb; | |
123 | rc = nd_pfn_validate(nd_pfn, DAX_SIG); | |
124 | dev_dbg(dev, "%s: dax: %s\n", __func__, | |
125 | rc == 0 ? dev_name(dax_dev) : "<none>"); | |
126 | if (rc < 0) { | |
127 | __nd_detach_ndns(dax_dev, &nd_pfn->ndns); | |
128 | put_device(dax_dev); | |
129 | } else | |
130 | __nd_device_register(dax_dev); | |
131 | ||
132 | return rc; | |
133 | } | |
134 | EXPORT_SYMBOL(nd_dax_probe); |