blob: cb477518dd0e4d397ede8ccc83ffe2f29ceb02a6 [file] [log] [blame]
Dan Williams8c2f7e82015-06-25 04:20:04 -04001/*
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/blkdev.h>
14#include <linux/device.h>
15#include <linux/genhd.h>
16#include <linux/sizes.h>
17#include <linux/slab.h>
18#include <linux/fs.h>
19#include <linux/mm.h>
20#include "nd-core.h"
21#include "btt.h"
22#include "nd.h"
23
Dan Williams8c2f7e82015-06-25 04:20:04 -040024static void nd_btt_release(struct device *dev)
25{
26 struct nd_region *nd_region = to_nd_region(dev->parent);
27 struct nd_btt *nd_btt = to_nd_btt(dev);
28
29 dev_dbg(dev, "%s\n", __func__);
Dan Williamse1455742015-07-30 17:57:47 -040030 nd_detach_ndns(&nd_btt->dev, &nd_btt->ndns);
Dan Williams8c2f7e82015-06-25 04:20:04 -040031 ida_simple_remove(&nd_region->btt_ida, nd_btt->id);
32 kfree(nd_btt->uuid);
33 kfree(nd_btt);
34}
35
36static struct device_type nd_btt_device_type = {
37 .name = "nd_btt",
38 .release = nd_btt_release,
39};
40
41bool is_nd_btt(struct device *dev)
42{
43 return dev->type == &nd_btt_device_type;
44}
45EXPORT_SYMBOL(is_nd_btt);
46
47struct nd_btt *to_nd_btt(struct device *dev)
48{
49 struct nd_btt *nd_btt = container_of(dev, struct nd_btt, dev);
50
51 WARN_ON(!is_nd_btt(dev));
52 return nd_btt;
53}
54EXPORT_SYMBOL(to_nd_btt);
55
Vishal Verma41cd8b72015-06-25 04:21:52 -040056static const unsigned long btt_lbasize_supported[] = { 512, 520, 528,
57 4096, 4104, 4160, 4224, 0 };
Dan Williams8c2f7e82015-06-25 04:20:04 -040058
59static ssize_t sector_size_show(struct device *dev,
60 struct device_attribute *attr, char *buf)
61{
62 struct nd_btt *nd_btt = to_nd_btt(dev);
63
64 return nd_sector_size_show(nd_btt->lbasize, btt_lbasize_supported, buf);
65}
66
67static ssize_t sector_size_store(struct device *dev,
68 struct device_attribute *attr, const char *buf, size_t len)
69{
70 struct nd_btt *nd_btt = to_nd_btt(dev);
71 ssize_t rc;
72
73 device_lock(dev);
74 nvdimm_bus_lock(dev);
75 rc = nd_sector_size_store(dev, buf, &nd_btt->lbasize,
76 btt_lbasize_supported);
77 dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
78 rc, buf, buf[len - 1] == '\n' ? "" : "\n");
79 nvdimm_bus_unlock(dev);
80 device_unlock(dev);
81
82 return rc ? rc : len;
83}
84static DEVICE_ATTR_RW(sector_size);
85
86static ssize_t uuid_show(struct device *dev,
87 struct device_attribute *attr, char *buf)
88{
89 struct nd_btt *nd_btt = to_nd_btt(dev);
90
91 if (nd_btt->uuid)
92 return sprintf(buf, "%pUb\n", nd_btt->uuid);
93 return sprintf(buf, "\n");
94}
95
96static ssize_t uuid_store(struct device *dev,
97 struct device_attribute *attr, const char *buf, size_t len)
98{
99 struct nd_btt *nd_btt = to_nd_btt(dev);
100 ssize_t rc;
101
102 device_lock(dev);
103 rc = nd_uuid_store(dev, &nd_btt->uuid, buf, len);
104 dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
105 rc, buf, buf[len - 1] == '\n' ? "" : "\n");
106 device_unlock(dev);
107
108 return rc ? rc : len;
109}
110static DEVICE_ATTR_RW(uuid);
111
112static ssize_t namespace_show(struct device *dev,
113 struct device_attribute *attr, char *buf)
114{
115 struct nd_btt *nd_btt = to_nd_btt(dev);
116 ssize_t rc;
117
118 nvdimm_bus_lock(dev);
119 rc = sprintf(buf, "%s\n", nd_btt->ndns
120 ? dev_name(&nd_btt->ndns->dev) : "");
121 nvdimm_bus_unlock(dev);
122 return rc;
123}
124
Dan Williams8c2f7e82015-06-25 04:20:04 -0400125static ssize_t namespace_store(struct device *dev,
126 struct device_attribute *attr, const char *buf, size_t len)
127{
Dan Williamse1455742015-07-30 17:57:47 -0400128 struct nd_btt *nd_btt = to_nd_btt(dev);
Dan Williams8c2f7e82015-06-25 04:20:04 -0400129 ssize_t rc;
130
Dan Williams8c2f7e82015-06-25 04:20:04 -0400131 device_lock(dev);
Axel Lin4be9c1f2015-09-16 21:24:47 +0800132 nvdimm_bus_lock(dev);
Dan Williamse1455742015-07-30 17:57:47 -0400133 rc = nd_namespace_store(dev, &nd_btt->ndns, buf, len);
Dan Williams8c2f7e82015-06-25 04:20:04 -0400134 dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
135 rc, buf, buf[len - 1] == '\n' ? "" : "\n");
Dan Williams8c2f7e82015-06-25 04:20:04 -0400136 nvdimm_bus_unlock(dev);
Axel Lin4be9c1f2015-09-16 21:24:47 +0800137 device_unlock(dev);
Dan Williams8c2f7e82015-06-25 04:20:04 -0400138
139 return rc;
140}
141static DEVICE_ATTR_RW(namespace);
142
143static struct attribute *nd_btt_attributes[] = {
144 &dev_attr_sector_size.attr,
145 &dev_attr_namespace.attr,
146 &dev_attr_uuid.attr,
147 NULL,
148};
149
150static struct attribute_group nd_btt_attribute_group = {
151 .attrs = nd_btt_attributes,
152};
153
154static const struct attribute_group *nd_btt_attribute_groups[] = {
155 &nd_btt_attribute_group,
156 &nd_device_attribute_group,
Toshi Kani74ae66c2015-06-19 12:18:34 -0600157 &nd_numa_attribute_group,
Dan Williams8c2f7e82015-06-25 04:20:04 -0400158 NULL,
159};
160
161static struct device *__nd_btt_create(struct nd_region *nd_region,
162 unsigned long lbasize, u8 *uuid,
163 struct nd_namespace_common *ndns)
164{
165 struct nd_btt *nd_btt;
166 struct device *dev;
167
168 nd_btt = kzalloc(sizeof(*nd_btt), GFP_KERNEL);
169 if (!nd_btt)
170 return NULL;
171
172 nd_btt->id = ida_simple_get(&nd_region->btt_ida, 0, 0, GFP_KERNEL);
173 if (nd_btt->id < 0) {
174 kfree(nd_btt);
175 return NULL;
176 }
177
178 nd_btt->lbasize = lbasize;
179 if (uuid)
180 uuid = kmemdup(uuid, 16, GFP_KERNEL);
181 nd_btt->uuid = uuid;
182 dev = &nd_btt->dev;
183 dev_set_name(dev, "btt%d.%d", nd_region->id, nd_btt->id);
184 dev->parent = &nd_region->dev;
185 dev->type = &nd_btt_device_type;
186 dev->groups = nd_btt_attribute_groups;
187 device_initialize(&nd_btt->dev);
Dan Williamse1455742015-07-30 17:57:47 -0400188 if (ndns && !__nd_attach_ndns(&nd_btt->dev, ndns, &nd_btt->ndns)) {
Dan Williams8c2f7e82015-06-25 04:20:04 -0400189 dev_dbg(&ndns->dev, "%s failed, already claimed by %s\n",
190 __func__, dev_name(ndns->claim));
191 put_device(dev);
192 return NULL;
193 }
194 return dev;
195}
196
197struct device *nd_btt_create(struct nd_region *nd_region)
198{
199 struct device *dev = __nd_btt_create(nd_region, 0, NULL, NULL);
200
201 if (dev)
202 __nd_device_register(dev);
203 return dev;
204}
205
Vishal Verma6ec68952015-07-29 14:58:09 -0600206static bool uuid_is_null(u8 *uuid)
207{
208 static const u8 null_uuid[16];
209
210 return (memcmp(uuid, null_uuid, 16) == 0);
211}
212
Vishal Vermaab45e762015-07-29 14:58:08 -0600213/**
214 * nd_btt_arena_is_valid - check if the metadata layout is valid
215 * @nd_btt: device with BTT geometry and backing device info
216 * @super: pointer to the arena's info block being tested
217 *
218 * Check consistency of the btt info block with itself by validating
Vishal Verma6ec68952015-07-29 14:58:09 -0600219 * the checksum, and with the parent namespace by verifying the
220 * parent_uuid contained in the info block with the one supplied in.
Vishal Vermaab45e762015-07-29 14:58:08 -0600221 *
222 * Returns:
223 * false for an invalid info block, true for a valid one
224 */
225bool nd_btt_arena_is_valid(struct nd_btt *nd_btt, struct btt_sb *super)
226{
Vishal Verma6ec68952015-07-29 14:58:09 -0600227 const u8 *parent_uuid = nd_dev_to_uuid(&nd_btt->ndns->dev);
Vishal Vermaab45e762015-07-29 14:58:08 -0600228 u64 checksum;
229
230 if (memcmp(super->signature, BTT_SIG, BTT_SIG_LEN) != 0)
231 return false;
232
Vishal Verma6ec68952015-07-29 14:58:09 -0600233 if (!uuid_is_null(super->parent_uuid))
234 if (memcmp(super->parent_uuid, parent_uuid, 16) != 0)
235 return false;
236
Vishal Vermaab45e762015-07-29 14:58:08 -0600237 checksum = le64_to_cpu(super->checksum);
238 super->checksum = 0;
Dan Williamse1455742015-07-30 17:57:47 -0400239 if (checksum != nd_sb_checksum((struct nd_gen_sb *) super))
Vishal Vermaab45e762015-07-29 14:58:08 -0600240 return false;
241 super->checksum = cpu_to_le64(checksum);
242
243 /* TODO: figure out action for this */
244 if ((le32_to_cpu(super->flags) & IB_FLAG_ERROR_MASK) != 0)
245 dev_info(&nd_btt->dev, "Found arena with an error flag\n");
246
247 return true;
248}
249EXPORT_SYMBOL(nd_btt_arena_is_valid);
250
Dan Williams8c2f7e82015-06-25 04:20:04 -0400251static int __nd_btt_probe(struct nd_btt *nd_btt,
252 struct nd_namespace_common *ndns, struct btt_sb *btt_sb)
253{
Dan Williams8c2f7e82015-06-25 04:20:04 -0400254 if (!btt_sb || !ndns || !nd_btt)
255 return -ENODEV;
256
257 if (nvdimm_read_bytes(ndns, SZ_4K, btt_sb, sizeof(*btt_sb)))
258 return -ENXIO;
259
260 if (nvdimm_namespace_capacity(ndns) < SZ_16M)
261 return -ENXIO;
262
Vishal Vermaab45e762015-07-29 14:58:08 -0600263 if (!nd_btt_arena_is_valid(nd_btt, btt_sb))
Dan Williams8c2f7e82015-06-25 04:20:04 -0400264 return -ENODEV;
265
Dan Williams8c2f7e82015-06-25 04:20:04 -0400266 nd_btt->lbasize = le32_to_cpu(btt_sb->external_lbasize);
267 nd_btt->uuid = kmemdup(btt_sb->uuid, 16, GFP_KERNEL);
268 if (!nd_btt->uuid)
269 return -ENOMEM;
270
271 __nd_device_register(&nd_btt->dev);
272
273 return 0;
274}
275
276int nd_btt_probe(struct nd_namespace_common *ndns, void *drvdata)
277{
278 int rc;
279 struct device *dev;
280 struct btt_sb *btt_sb;
281 struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
282
283 if (ndns->force_raw)
284 return -ENODEV;
285
286 nvdimm_bus_lock(&ndns->dev);
287 dev = __nd_btt_create(nd_region, 0, NULL, ndns);
288 nvdimm_bus_unlock(&ndns->dev);
289 if (!dev)
290 return -ENOMEM;
291 dev_set_drvdata(dev, drvdata);
292 btt_sb = kzalloc(sizeof(*btt_sb), GFP_KERNEL);
293 rc = __nd_btt_probe(to_nd_btt(dev), ndns, btt_sb);
294 kfree(btt_sb);
295 dev_dbg(&ndns->dev, "%s: btt: %s\n", __func__,
296 rc == 0 ? dev_name(dev) : "<none>");
297 if (rc < 0) {
Dan Williamse1455742015-07-30 17:57:47 -0400298 struct nd_btt *nd_btt = to_nd_btt(dev);
299
300 __nd_detach_ndns(dev, &nd_btt->ndns);
Dan Williams8c2f7e82015-06-25 04:20:04 -0400301 put_device(dev);
302 }
303
304 return rc;
305}
306EXPORT_SYMBOL(nd_btt_probe);