tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/cpumask.h>
14#include <linux/module.h>
15#include <linux/device.h>
16#include <linux/nd.h>
17#include "nd-core.h"
18#include "nd.h"
19
20static int nd_region_probe(struct device *dev)
21{
22 int err, rc;
23 static unsigned long once;
24 struct nd_region_data *ndrd;
25 struct nd_region *nd_region = to_nd_region(dev);
26
27 if (nd_region->num_lanes > num_online_cpus()
28 && nd_region->num_lanes < num_possible_cpus()
29 && !test_and_set_bit(0, &once)) {
30 dev_dbg(dev, "online cpus (%d) < concurrent i/o lanes (%d) < possible cpus (%d)\n",
31 num_online_cpus(), nd_region->num_lanes,
32 num_possible_cpus());
33 dev_dbg(dev, "setting nr_cpus=%d may yield better libnvdimm device performance\n",
34 nd_region->num_lanes);
35 }
36
37 rc = nd_region_activate(nd_region);
38 if (rc)
39 return rc;
40
41 rc = nd_blk_region_init(nd_region);
42 if (rc)
43 return rc;
44
45 rc = nd_region_register_namespaces(nd_region, &err);
46 if (rc < 0)
47 return rc;
48
49 ndrd = dev_get_drvdata(dev);
50 ndrd->ns_active = rc;
51 ndrd->ns_count = rc + err;
52
53 if (rc && err && rc == err)
54 return -ENODEV;
55
56 if (is_nd_pmem(&nd_region->dev)) {
57 struct resource ndr_res;
58
59 if (devm_init_badblocks(dev, &nd_region->bb))
60 return -ENODEV;
61 nd_region->bb_state = sysfs_get_dirent(nd_region->dev.kobj.sd,
62 "badblocks");
63 if (!nd_region->bb_state)
64 dev_warn(&nd_region->dev,
65 "'badblocks' notification disabled\n");
66 ndr_res.start = nd_region->ndr_start;
67 ndr_res.end = nd_region->ndr_start + nd_region->ndr_size - 1;
68 nvdimm_badblocks_populate(nd_region, &nd_region->bb, &ndr_res);
69 }
70
71 nd_region->btt_seed = nd_btt_create(nd_region);
72 nd_region->pfn_seed = nd_pfn_create(nd_region);
73 nd_region->dax_seed = nd_dax_create(nd_region);
74 if (err == 0)
75 return 0;
76
77 /*
78 * Given multiple namespaces per region, we do not want to
79 * disable all the successfully registered peer namespaces upon
80 * a single registration failure. If userspace is missing a
81 * namespace that it expects it can disable/re-enable the region
82 * to retry discovery after correcting the failure.
83 * <regionX>/namespaces returns the current
84 * "<async-registered>/<total>" namespace count.
85 */
86 dev_err(dev, "failed to register %d namespace%s, continuing...\n",
87 err, err == 1 ? "" : "s");
88 return 0;
89}
90
91static int child_unregister(struct device *dev, void *data)
92{
93 nd_device_unregister(dev, ND_SYNC);
94 return 0;
95}
96
97static int nd_region_remove(struct device *dev)
98{
99 struct nd_region *nd_region = to_nd_region(dev);
100
101 device_for_each_child(dev, NULL, child_unregister);
102
103 /* flush attribute readers and disable */
104 nvdimm_bus_lock(dev);
105 nd_region->ns_seed = NULL;
106 nd_region->btt_seed = NULL;
107 nd_region->pfn_seed = NULL;
108 nd_region->dax_seed = NULL;
109 dev_set_drvdata(dev, NULL);
110 nvdimm_bus_unlock(dev);
111
112 /*
113 * Note, this assumes device_lock() context to not race
114 * nd_region_notify()
115 */
116 sysfs_put(nd_region->bb_state);
117 nd_region->bb_state = NULL;
118
119 return 0;
120}
121
122static int child_notify(struct device *dev, void *data)
123{
124 nd_device_notify(dev, *(enum nvdimm_event *) data);
125 return 0;
126}
127
128static void nd_region_notify(struct device *dev, enum nvdimm_event event)
129{
130 if (event == NVDIMM_REVALIDATE_POISON) {
131 struct nd_region *nd_region = to_nd_region(dev);
132 struct resource res;
133
134 if (is_nd_pmem(&nd_region->dev)) {
135 res.start = nd_region->ndr_start;
136 res.end = nd_region->ndr_start +
137 nd_region->ndr_size - 1;
138 nvdimm_badblocks_populate(nd_region,
139 &nd_region->bb, &res);
140 if (nd_region->bb_state)
141 sysfs_notify_dirent(nd_region->bb_state);
142 }
143 }
144 device_for_each_child(dev, &event, child_notify);
145}
146
147static struct nd_device_driver nd_region_driver = {
148 .probe = nd_region_probe,
149 .remove = nd_region_remove,
150 .notify = nd_region_notify,
151 .drv = {
152 .name = "nd_region",
153 },
154 .type = ND_DRIVER_REGION_BLK | ND_DRIVER_REGION_PMEM,
155};
156
157int __init nd_region_init(void)
158{
159 return nd_driver_register(&nd_region_driver);
160}
161
162void nd_region_exit(void)
163{
164 driver_unregister(&nd_region_driver.drv);
165}
166
167MODULE_ALIAS_ND_DEVICE(ND_DEVICE_REGION_PMEM);
168MODULE_ALIAS_ND_DEVICE(ND_DEVICE_REGION_BLK);