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"
18#include "pfn.h"
19#include "nd.h"
20
21static 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, "trace\n");
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
34static struct device_type nd_dax_device_type = {
35 .name = "nd_dax",
36 .release = nd_dax_release,
37};
38
39bool is_nd_dax(struct device *dev)
40{
41 return dev ? dev->type == &nd_dax_device_type : false;
42}
43EXPORT_SYMBOL(is_nd_dax);
44
45struct 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}
52EXPORT_SYMBOL(to_nd_dax);
53
54static 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
61static 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
87struct 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_memory(&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}
101
102int 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 switch (ndns->claim_class) {
115 case NVDIMM_CCLASS_NONE:
116 case NVDIMM_CCLASS_DAX:
117 break;
118 default:
119 return -ENODEV;
120 }
121
122 nvdimm_bus_lock(&ndns->dev);
123 nd_dax = nd_dax_alloc(nd_region);
124 nd_pfn = &nd_dax->nd_pfn;
125 dax_dev = nd_pfn_devinit(nd_pfn, ndns);
126 nvdimm_bus_unlock(&ndns->dev);
127 if (!dax_dev)
128 return -ENOMEM;
129 pfn_sb = devm_kzalloc(dev, sizeof(*pfn_sb), GFP_KERNEL);
130 nd_pfn->pfn_sb = pfn_sb;
131 rc = nd_pfn_validate(nd_pfn, DAX_SIG);
132 dev_dbg(dev, "dax: %s\n", rc == 0 ? dev_name(dax_dev) : "<none>");
133 if (rc < 0) {
134 nd_detach_ndns(dax_dev, &nd_pfn->ndns);
135 put_device(dax_dev);
136 } else
137 __nd_device_register(dax_dev);
138
139 return rc;
140}
141EXPORT_SYMBOL(nd_dax_probe);
142