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4d88a97a 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/vmalloc.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/device.h> | |
16 | #include <linux/sizes.h> | |
17 | #include <linux/ndctl.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/mm.h> | |
20 | #include <linux/nd.h> | |
4a826c83 | 21 | #include "label.h" |
4d88a97a DW |
22 | #include "nd.h" |
23 | ||
4d88a97a DW |
24 | static int nvdimm_probe(struct device *dev) |
25 | { | |
26 | struct nvdimm_drvdata *ndd; | |
27 | int rc; | |
28 | ||
1cd73865 DW |
29 | rc = nvdimm_security_setup_events(dev); |
30 | if (rc < 0) { | |
31 | dev_err(dev, "security event setup failed: %d\n", rc); | |
32 | return rc; | |
33 | } | |
34 | ||
aee65987 TK |
35 | rc = nvdimm_check_config_data(dev); |
36 | if (rc) { | |
37 | /* not required for non-aliased nvdimm, ex. NVDIMM-N */ | |
38 | if (rc == -ENOTTY) | |
39 | rc = 0; | |
40 | return rc; | |
41 | } | |
42 | ||
4c6926a2 DJ |
43 | /* |
44 | * The locked status bit reflects explicit status codes from the | |
45 | * label reading commands, revalidate it each time the driver is | |
46 | * activated and re-reads the label area. | |
47 | */ | |
08e6b3c6 DW |
48 | nvdimm_clear_locked(dev); |
49 | ||
4d88a97a DW |
50 | ndd = kzalloc(sizeof(*ndd), GFP_KERNEL); |
51 | if (!ndd) | |
52 | return -ENOMEM; | |
53 | ||
54 | dev_set_drvdata(dev, ndd); | |
4a826c83 DW |
55 | ndd->dpa.name = dev_name(dev); |
56 | ndd->ns_current = -1; | |
57 | ndd->ns_next = -1; | |
58 | ndd->dpa.start = 0; | |
59 | ndd->dpa.end = -1; | |
4d88a97a | 60 | ndd->dev = dev; |
bf9bccc1 DW |
61 | get_device(dev); |
62 | kref_init(&ndd->kref); | |
4d88a97a | 63 | |
4c6926a2 DJ |
64 | /* |
65 | * Attempt to unlock, if the DIMM supports security commands, | |
66 | * otherwise the locked indication is determined by explicit | |
67 | * status codes from the label reading commands. | |
68 | */ | |
69 | rc = nvdimm_security_unlock(dev); | |
70 | if (rc < 0) | |
37379cfc | 71 | dev_dbg(dev, "failed to unlock dimm: %d\n", rc); |
4c6926a2 DJ |
72 | |
73 | ||
08e6b3c6 DW |
74 | /* |
75 | * EACCES failures reading the namespace label-area-properties | |
76 | * are interpreted as the DIMM capacity being locked but the | |
77 | * namespace labels themselves being accessible. | |
78 | */ | |
4d88a97a | 79 | rc = nvdimm_init_nsarea(ndd); |
08e6b3c6 DW |
80 | if (rc == -EACCES) { |
81 | /* | |
82 | * See nvdimm_namespace_common_probe() where we fail to | |
83 | * allow namespaces to probe while the DIMM is locked, | |
84 | * but we do allow for namespace enumeration. | |
85 | */ | |
9d62ed96 | 86 | nvdimm_set_locked(dev); |
08e6b3c6 DW |
87 | rc = 0; |
88 | } | |
4d88a97a DW |
89 | if (rc) |
90 | goto err; | |
91 | ||
08e6b3c6 DW |
92 | /* |
93 | * EACCES failures reading the namespace label-data are | |
94 | * interpreted as the label area being locked in addition to the | |
95 | * DIMM capacity. We fail the dimm probe to prevent regions from | |
96 | * attempting to parse the label area. | |
97 | */ | |
2d657d17 | 98 | rc = nd_label_data_init(ndd); |
4b27db7e DW |
99 | if (rc == -EACCES) |
100 | nvdimm_set_locked(dev); | |
4d88a97a DW |
101 | if (rc) |
102 | goto err; | |
103 | ||
104 | dev_dbg(dev, "config data size: %d\n", ndd->nsarea.config_size); | |
105 | ||
4a826c83 | 106 | nvdimm_bus_lock(dev); |
c31898c8 DW |
107 | if (ndd->ns_current >= 0) { |
108 | rc = nd_label_reserve_dpa(ndd); | |
109 | if (rc == 0) | |
110 | nvdimm_set_aliasing(dev); | |
111 | } | |
4a826c83 DW |
112 | nvdimm_bus_unlock(dev); |
113 | ||
114 | if (rc) | |
115 | goto err; | |
116 | ||
4d88a97a DW |
117 | return 0; |
118 | ||
119 | err: | |
bf9bccc1 | 120 | put_ndd(ndd); |
4d88a97a DW |
121 | return rc; |
122 | } | |
123 | ||
124 | static int nvdimm_remove(struct device *dev) | |
125 | { | |
126 | struct nvdimm_drvdata *ndd = dev_get_drvdata(dev); | |
127 | ||
aee65987 TK |
128 | if (!ndd) |
129 | return 0; | |
130 | ||
4a826c83 DW |
131 | nvdimm_bus_lock(dev); |
132 | dev_set_drvdata(dev, NULL); | |
4a826c83 | 133 | nvdimm_bus_unlock(dev); |
bf9bccc1 | 134 | put_ndd(ndd); |
4d88a97a DW |
135 | |
136 | return 0; | |
137 | } | |
138 | ||
139 | static struct nd_device_driver nvdimm_driver = { | |
140 | .probe = nvdimm_probe, | |
141 | .remove = nvdimm_remove, | |
142 | .drv = { | |
143 | .name = "nvdimm", | |
144 | }, | |
145 | .type = ND_DRIVER_DIMM, | |
146 | }; | |
147 | ||
148 | int __init nvdimm_init(void) | |
149 | { | |
150 | return nd_driver_register(&nvdimm_driver); | |
151 | } | |
152 | ||
3d88002e | 153 | void nvdimm_exit(void) |
4d88a97a DW |
154 | { |
155 | driver_unregister(&nvdimm_driver.drv); | |
156 | } | |
157 | ||
158 | MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DIMM); |