1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
4 */
5 #include <linux/vmalloc.h>
6 #include <linux/module.h>
7 #include <linux/device.h>
8 #include <linux/sizes.h>
9 #include <linux/ndctl.h>
10 #include <linux/slab.h>
11 #include <linux/mm.h>
12 #include <linux/nd.h>
13 #include "label.h"
14 #include "nd.h"
15
nvdimm_probe(struct device * dev)16 static int nvdimm_probe(struct device *dev)
17 {
18 struct nvdimm_drvdata *ndd;
19 int rc;
20
21 rc = nvdimm_security_setup_events(dev);
22 if (rc < 0) {
23 dev_err(dev, "security event setup failed: %d\n", rc);
24 return rc;
25 }
26
27 rc = nvdimm_check_config_data(dev);
28 if (rc) {
29 /* not required for non-aliased nvdimm, ex. NVDIMM-N */
30 if (rc == -ENOTTY)
31 rc = 0;
32 return rc;
33 }
34
35 /*
36 * The locked status bit reflects explicit status codes from the
37 * label reading commands, revalidate it each time the driver is
38 * activated and re-reads the label area.
39 */
40 nvdimm_clear_locked(dev);
41
42 ndd = kzalloc(sizeof(*ndd), GFP_KERNEL);
43 if (!ndd)
44 return -ENOMEM;
45
46 dev_set_drvdata(dev, ndd);
47 ndd->dpa.name = dev_name(dev);
48 ndd->ns_current = -1;
49 ndd->ns_next = -1;
50 ndd->dpa.start = 0;
51 ndd->dpa.end = -1;
52 ndd->dev = dev;
53 get_device(dev);
54 kref_init(&ndd->kref);
55
56 /*
57 * Attempt to unlock, if the DIMM supports security commands,
58 * otherwise the locked indication is determined by explicit
59 * status codes from the label reading commands.
60 */
61 rc = nvdimm_security_unlock(dev);
62 if (rc < 0)
63 dev_dbg(dev, "failed to unlock dimm: %d\n", rc);
64
65
66 /*
67 * EACCES failures reading the namespace label-area-properties
68 * are interpreted as the DIMM capacity being locked but the
69 * namespace labels themselves being accessible.
70 */
71 rc = nvdimm_init_nsarea(ndd);
72 if (rc == -EACCES) {
73 /*
74 * See nvdimm_namespace_common_probe() where we fail to
75 * allow namespaces to probe while the DIMM is locked,
76 * but we do allow for namespace enumeration.
77 */
78 nvdimm_set_locked(dev);
79 rc = 0;
80 }
81 if (rc)
82 goto err;
83
84 /*
85 * EACCES failures reading the namespace label-data are
86 * interpreted as the label area being locked in addition to the
87 * DIMM capacity. We fail the dimm probe to prevent regions from
88 * attempting to parse the label area.
89 */
90 rc = nd_label_data_init(ndd);
91 if (rc == -EACCES)
92 nvdimm_set_locked(dev);
93 if (rc)
94 goto err;
95
96 dev_dbg(dev, "config data size: %d\n", ndd->nsarea.config_size);
97
98 nvdimm_bus_lock(dev);
99 if (ndd->ns_current >= 0) {
100 rc = nd_label_reserve_dpa(ndd);
101 if (rc == 0)
102 nvdimm_set_aliasing(dev);
103 }
104 nvdimm_bus_unlock(dev);
105
106 if (rc)
107 goto err;
108
109 return 0;
110
111 err:
112 put_ndd(ndd);
113 return rc;
114 }
115
nvdimm_remove(struct device * dev)116 static int nvdimm_remove(struct device *dev)
117 {
118 struct nvdimm_drvdata *ndd = dev_get_drvdata(dev);
119
120 if (!ndd)
121 return 0;
122
123 nvdimm_bus_lock(dev);
124 dev_set_drvdata(dev, NULL);
125 nvdimm_bus_unlock(dev);
126 put_ndd(ndd);
127
128 return 0;
129 }
130
131 static struct nd_device_driver nvdimm_driver = {
132 .probe = nvdimm_probe,
133 .remove = nvdimm_remove,
134 .drv = {
135 .name = "nvdimm",
136 },
137 .type = ND_DRIVER_DIMM,
138 };
139
nvdimm_init(void)140 int __init nvdimm_init(void)
141 {
142 return nd_driver_register(&nvdimm_driver);
143 }
144
nvdimm_exit(void)145 void nvdimm_exit(void)
146 {
147 driver_unregister(&nvdimm_driver.drv);
148 }
149
150 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DIMM);
151
