Merge tag 'kbuild-v6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy...
[platform/kernel/linux-starfive.git] / drivers / nvdimm / dimm.c
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
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_labeling(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
116 static void nvdimm_remove(struct device *dev)
117 {
118         struct nvdimm_drvdata *ndd = dev_get_drvdata(dev);
119
120         nvdimm_bus_lock(dev);
121         dev_set_drvdata(dev, NULL);
122         nvdimm_bus_unlock(dev);
123         put_ndd(ndd);
124 }
125
126 static struct nd_device_driver nvdimm_driver = {
127         .probe = nvdimm_probe,
128         .remove = nvdimm_remove,
129         .drv = {
130                 .name = "nvdimm",
131         },
132         .type = ND_DRIVER_DIMM,
133 };
134
135 int __init nvdimm_init(void)
136 {
137         return nd_driver_register(&nvdimm_driver);
138 }
139
140 void nvdimm_exit(void)
141 {
142         driver_unregister(&nvdimm_driver.drv);
143 }
144
145 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DIMM);