Loading...
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
12static 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 resource ndr_res;
39
40 if (devm_init_badblocks(dev, &nd_region->bb))
41 return -ENODEV;
42 nd_region->bb_state = sysfs_get_dirent(nd_region->dev.kobj.sd,
43 "badblocks");
44 if (!nd_region->bb_state)
45 dev_warn(&nd_region->dev,
46 "'badblocks' notification disabled\n");
47 ndr_res.start = nd_region->ndr_start;
48 ndr_res.end = nd_region->ndr_start + nd_region->ndr_size - 1;
49 nvdimm_badblocks_populate(nd_region, &nd_region->bb, &ndr_res);
50 }
51
52 rc = nd_region_register_namespaces(nd_region, &err);
53 if (rc < 0)
54 return rc;
55
56 ndrd = dev_get_drvdata(dev);
57 ndrd->ns_active = rc;
58 ndrd->ns_count = rc + err;
59
60 if (rc && err && rc == err)
61 return -ENODEV;
62
63 nd_region->btt_seed = nd_btt_create(nd_region);
64 nd_region->pfn_seed = nd_pfn_create(nd_region);
65 nd_region->dax_seed = nd_dax_create(nd_region);
66 if (err == 0)
67 return 0;
68
69 /*
70 * Given multiple namespaces per region, we do not want to
71 * disable all the successfully registered peer namespaces upon
72 * a single registration failure. If userspace is missing a
73 * namespace that it expects it can disable/re-enable the region
74 * to retry discovery after correcting the failure.
75 * <regionX>/namespaces returns the current
76 * "<async-registered>/<total>" namespace count.
77 */
78 dev_err(dev, "failed to register %d namespace%s, continuing...\n",
79 err, err == 1 ? "" : "s");
80 return 0;
81}
82
83static int child_unregister(struct device *dev, void *data)
84{
85 nd_device_unregister(dev, ND_SYNC);
86 return 0;
87}
88
89static int nd_region_remove(struct device *dev)
90{
91 struct nd_region *nd_region = to_nd_region(dev);
92
93 device_for_each_child(dev, NULL, child_unregister);
94
95 /* flush attribute readers and disable */
96 nvdimm_bus_lock(dev);
97 nd_region->ns_seed = NULL;
98 nd_region->btt_seed = NULL;
99 nd_region->pfn_seed = NULL;
100 nd_region->dax_seed = NULL;
101 dev_set_drvdata(dev, NULL);
102 nvdimm_bus_unlock(dev);
103
104 /*
105 * Note, this assumes nd_device_lock() context to not race
106 * nd_region_notify()
107 */
108 sysfs_put(nd_region->bb_state);
109 nd_region->bb_state = NULL;
110
111 return 0;
112}
113
114static int child_notify(struct device *dev, void *data)
115{
116 nd_device_notify(dev, *(enum nvdimm_event *) data);
117 return 0;
118}
119
120static void nd_region_notify(struct device *dev, enum nvdimm_event event)
121{
122 if (event == NVDIMM_REVALIDATE_POISON) {
123 struct nd_region *nd_region = to_nd_region(dev);
124 struct resource res;
125
126 if (is_memory(&nd_region->dev)) {
127 res.start = nd_region->ndr_start;
128 res.end = nd_region->ndr_start +
129 nd_region->ndr_size - 1;
130 nvdimm_badblocks_populate(nd_region,
131 &nd_region->bb, &res);
132 if (nd_region->bb_state)
133 sysfs_notify_dirent(nd_region->bb_state);
134 }
135 }
136 device_for_each_child(dev, &event, child_notify);
137}
138
139static struct nd_device_driver nd_region_driver = {
140 .probe = nd_region_probe,
141 .remove = nd_region_remove,
142 .notify = nd_region_notify,
143 .drv = {
144 .name = "nd_region",
145 },
146 .type = ND_DRIVER_REGION_BLK | ND_DRIVER_REGION_PMEM,
147};
148
149int __init nd_region_init(void)
150{
151 return nd_driver_register(&nd_region_driver);
152}
153
154void nd_region_exit(void)
155{
156 driver_unregister(&nd_region_driver.drv);
157}
158
159MODULE_ALIAS_ND_DEVICE(ND_DEVICE_REGION_PMEM);
160MODULE_ALIAS_ND_DEVICE(ND_DEVICE_REGION_BLK);
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
12static 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
84static int child_unregister(struct device *dev, void *data)
85{
86 nd_device_unregister(dev, ND_SYNC);
87 return 0;
88}
89
90static void 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
113static int child_notify(struct device *dev, void *data)
114{
115 nd_device_notify(dev, *(enum nvdimm_event *) data);
116 return 0;
117}
118
119static void nd_region_notify(struct device *dev, enum nvdimm_event event)
120{
121 if (event == NVDIMM_REVALIDATE_POISON) {
122 struct nd_region *nd_region = to_nd_region(dev);
123
124 if (is_memory(&nd_region->dev)) {
125 struct range range = {
126 .start = nd_region->ndr_start,
127 .end = nd_region->ndr_start +
128 nd_region->ndr_size - 1,
129 };
130
131 nvdimm_badblocks_populate(nd_region,
132 &nd_region->bb, &range);
133 if (nd_region->bb_state)
134 sysfs_notify_dirent(nd_region->bb_state);
135 }
136 }
137 device_for_each_child(dev, &event, child_notify);
138}
139
140static struct nd_device_driver nd_region_driver = {
141 .probe = nd_region_probe,
142 .remove = nd_region_remove,
143 .notify = nd_region_notify,
144 .drv = {
145 .name = "nd_region",
146 },
147 .type = ND_DRIVER_REGION_BLK | ND_DRIVER_REGION_PMEM,
148};
149
150int __init nd_region_init(void)
151{
152 return nd_driver_register(&nd_region_driver);
153}
154
155void nd_region_exit(void)
156{
157 driver_unregister(&nd_region_driver.drv);
158}
159
160MODULE_ALIAS_ND_DEVICE(ND_DEVICE_REGION_PMEM);
161MODULE_ALIAS_ND_DEVICE(ND_DEVICE_REGION_BLK);