xref: /openbmc/linux/drivers/nvdimm/dimm.c (revision 5d0e4d78)
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>
21 #include "label.h"
22 #include "nd.h"
23 
24 static int nvdimm_probe(struct device *dev)
25 {
26 	struct nvdimm_drvdata *ndd;
27 	int rc;
28 
29 	rc = nvdimm_check_config_data(dev);
30 	if (rc) {
31 		/* not required for non-aliased nvdimm, ex. NVDIMM-N */
32 		if (rc == -ENOTTY)
33 			rc = 0;
34 		return rc;
35 	}
36 
37 	ndd = kzalloc(sizeof(*ndd), GFP_KERNEL);
38 	if (!ndd)
39 		return -ENOMEM;
40 
41 	dev_set_drvdata(dev, ndd);
42 	ndd->dpa.name = dev_name(dev);
43 	ndd->ns_current = -1;
44 	ndd->ns_next = -1;
45 	ndd->dpa.start = 0;
46 	ndd->dpa.end = -1;
47 	ndd->dev = dev;
48 	get_device(dev);
49 	kref_init(&ndd->kref);
50 
51 	rc = nvdimm_init_nsarea(ndd);
52 	if (rc == -EACCES)
53 		nvdimm_set_locked(dev);
54 	if (rc)
55 		goto err;
56 
57 	rc = nvdimm_init_config_data(ndd);
58 	if (rc)
59 		goto err;
60 
61 	dev_dbg(dev, "config data size: %d\n", ndd->nsarea.config_size);
62 
63 	nvdimm_bus_lock(dev);
64 	ndd->ns_current = nd_label_validate(ndd);
65 	ndd->ns_next = nd_label_next_nsindex(ndd->ns_current);
66 	nd_label_copy(ndd, to_next_namespace_index(ndd),
67 			to_current_namespace_index(ndd));
68 	rc = nd_label_reserve_dpa(ndd);
69 	if (ndd->ns_current >= 0)
70 		nvdimm_set_aliasing(dev);
71 	nvdimm_bus_unlock(dev);
72 
73 	if (rc)
74 		goto err;
75 
76 	return 0;
77 
78  err:
79 	put_ndd(ndd);
80 	return rc;
81 }
82 
83 static int nvdimm_remove(struct device *dev)
84 {
85 	struct nvdimm_drvdata *ndd = dev_get_drvdata(dev);
86 
87 	if (!ndd)
88 		return 0;
89 
90 	nvdimm_bus_lock(dev);
91 	dev_set_drvdata(dev, NULL);
92 	nvdimm_bus_unlock(dev);
93 	put_ndd(ndd);
94 
95 	return 0;
96 }
97 
98 static struct nd_device_driver nvdimm_driver = {
99 	.probe = nvdimm_probe,
100 	.remove = nvdimm_remove,
101 	.drv = {
102 		.name = "nvdimm",
103 	},
104 	.type = ND_DRIVER_DIMM,
105 };
106 
107 int __init nvdimm_init(void)
108 {
109 	return nd_driver_register(&nvdimm_driver);
110 }
111 
112 void nvdimm_exit(void)
113 {
114 	driver_unregister(&nvdimm_driver.drv);
115 }
116 
117 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_DIMM);
118