1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
4 */
5 #include <linux/cpumask.h>
6 #include <linux/module.h>
7 #include <linux/device.h>
8 #include <linux/nd.h>
9 #include "nd-core.h"
10 #include "nd.h"
11
nd_region_probe(struct device * dev)12 static int nd_region_probe(struct device *dev)
13 {
14 int err, rc;
15 static unsigned long once;
16 struct nd_region_data *ndrd;
17 struct nd_region *nd_region = to_nd_region(dev);
18
19 if (nd_region->num_lanes > num_online_cpus()
20 && nd_region->num_lanes < num_possible_cpus()
21 && !test_and_set_bit(0, &once)) {
22 dev_dbg(dev, "online cpus (%d) < concurrent i/o lanes (%d) < possible cpus (%d)\n",
23 num_online_cpus(), nd_region->num_lanes,
24 num_possible_cpus());
25 dev_dbg(dev, "setting nr_cpus=%d may yield better libnvdimm device performance\n",
26 nd_region->num_lanes);
27 }
28
29 rc = nd_region_activate(nd_region);
30 if (rc)
31 return rc;
32
33 rc = nd_blk_region_init(nd_region);
34 if (rc)
35 return rc;
36
37 if (is_memory(&nd_region->dev)) {
38 struct range range = {
39 .start = nd_region->ndr_start,
40 .end = nd_region->ndr_start + nd_region->ndr_size - 1,
41 };
42
43 if (devm_init_badblocks(dev, &nd_region->bb))
44 return -ENODEV;
45 nd_region->bb_state = sysfs_get_dirent(nd_region->dev.kobj.sd,
46 "badblocks");
47 if (!nd_region->bb_state)
48 dev_warn(&nd_region->dev,
49 "'badblocks' notification disabled\n");
50 nvdimm_badblocks_populate(nd_region, &nd_region->bb, &range);
51 }
52
53 rc = nd_region_register_namespaces(nd_region, &err);
54 if (rc < 0)
55 return rc;
56
57 ndrd = dev_get_drvdata(dev);
58 ndrd->ns_active = rc;
59 ndrd->ns_count = rc + err;
60
61 if (rc && err && rc == err)
62 return -ENODEV;
63
64 nd_region->btt_seed = nd_btt_create(nd_region);
65 nd_region->pfn_seed = nd_pfn_create(nd_region);
66 nd_region->dax_seed = nd_dax_create(nd_region);
67 if (err == 0)
68 return 0;
69
70 /*
71 * Given multiple namespaces per region, we do not want to
72 * disable all the successfully registered peer namespaces upon
73 * a single registration failure. If userspace is missing a
74 * namespace that it expects it can disable/re-enable the region
75 * to retry discovery after correcting the failure.
76 * <regionX>/namespaces returns the current
77 * "<async-registered>/<total>" namespace count.
78 */
79 dev_err(dev, "failed to register %d namespace%s, continuing...\n",
80 err, err == 1 ? "" : "s");
81 return 0;
82 }
83
child_unregister(struct device * dev,void * data)84 static int child_unregister(struct device *dev, void *data)
85 {
86 nd_device_unregister(dev, ND_SYNC);
87 return 0;
88 }
89
nd_region_remove(struct device * dev)90 static int nd_region_remove(struct device *dev)
91 {
92 struct nd_region *nd_region = to_nd_region(dev);
93
94 device_for_each_child(dev, NULL, child_unregister);
95
96 /* flush attribute readers and disable */
97 nvdimm_bus_lock(dev);
98 nd_region->ns_seed = NULL;
99 nd_region->btt_seed = NULL;
100 nd_region->pfn_seed = NULL;
101 nd_region->dax_seed = NULL;
102 dev_set_drvdata(dev, NULL);
103 nvdimm_bus_unlock(dev);
104
105 /*
106 * Note, this assumes nd_device_lock() context to not race
107 * nd_region_notify()
108 */
109 sysfs_put(nd_region->bb_state);
110 nd_region->bb_state = NULL;
111
112 return 0;
113 }
114
child_notify(struct device * dev,void * data)115 static int child_notify(struct device *dev, void *data)
116 {
117 nd_device_notify(dev, *(enum nvdimm_event *) data);
118 return 0;
119 }
120
nd_region_notify(struct device * dev,enum nvdimm_event event)121 static void nd_region_notify(struct device *dev, enum nvdimm_event event)
122 {
123 if (event == NVDIMM_REVALIDATE_POISON) {
124 struct nd_region *nd_region = to_nd_region(dev);
125
126 if (is_memory(&nd_region->dev)) {
127 struct range range = {
128 .start = nd_region->ndr_start,
129 .end = nd_region->ndr_start +
130 nd_region->ndr_size - 1,
131 };
132
133 nvdimm_badblocks_populate(nd_region,
134 &nd_region->bb, &range);
135 if (nd_region->bb_state)
136 sysfs_notify_dirent(nd_region->bb_state);
137 }
138 }
139 device_for_each_child(dev, &event, child_notify);
140 }
141
142 static struct nd_device_driver nd_region_driver = {
143 .probe = nd_region_probe,
144 .remove = nd_region_remove,
145 .notify = nd_region_notify,
146 .drv = {
147 .name = "nd_region",
148 },
149 .type = ND_DRIVER_REGION_BLK | ND_DRIVER_REGION_PMEM,
150 };
151
nd_region_init(void)152 int __init nd_region_init(void)
153 {
154 return nd_driver_register(&nd_region_driver);
155 }
156
nd_region_exit(void)157 void nd_region_exit(void)
158 {
159 driver_unregister(&nd_region_driver.drv);
160 }
161
162 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_REGION_PMEM);
163 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_REGION_BLK);
164
