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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
24static 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__);
30 nd_detach_ndns(&nd_btt->dev, &nd_btt->ndns);
31 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
56static const unsigned long btt_lbasize_supported[] = { 512, 520, 528,
57 4096, 4104, 4160, 4224, 0 };
58
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_size_select_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_size_select_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
125static ssize_t namespace_store(struct device *dev,
126 struct device_attribute *attr, const char *buf, size_t len)
127{
128 struct nd_btt *nd_btt = to_nd_btt(dev);
129 ssize_t rc;
130
131 device_lock(dev);
132 nvdimm_bus_lock(dev);
133 rc = nd_namespace_store(dev, &nd_btt->ndns, buf, len);
134 dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
135 rc, buf, buf[len - 1] == '\n' ? "" : "\n");
136 nvdimm_bus_unlock(dev);
137 device_unlock(dev);
138
139 return rc;
140}
141static DEVICE_ATTR_RW(namespace);
142
143static ssize_t size_show(struct device *dev,
144 struct device_attribute *attr, char *buf)
145{
146 struct nd_btt *nd_btt = to_nd_btt(dev);
147 ssize_t rc;
148
149 device_lock(dev);
150 if (dev->driver)
151 rc = sprintf(buf, "%llu\n", nd_btt->size);
152 else {
153
154 rc = -ENXIO;
155 }
156 device_unlock(dev);
157
158 return rc;
159}
160static DEVICE_ATTR_RO(size);
161
162static struct attribute *nd_btt_attributes[] = {
163 &dev_attr_sector_size.attr,
164 &dev_attr_namespace.attr,
165 &dev_attr_uuid.attr,
166 &dev_attr_size.attr,
167 NULL,
168};
169
170static struct attribute_group nd_btt_attribute_group = {
171 .attrs = nd_btt_attributes,
172};
173
174static const struct attribute_group *nd_btt_attribute_groups[] = {
175 &nd_btt_attribute_group,
176 &nd_device_attribute_group,
177 &nd_numa_attribute_group,
178 NULL,
179};
180
181static struct device *__nd_btt_create(struct nd_region *nd_region,
182 unsigned long lbasize, u8 *uuid,
183 struct nd_namespace_common *ndns)
184{
185 struct nd_btt *nd_btt;
186 struct device *dev;
187
188 nd_btt = kzalloc(sizeof(*nd_btt), GFP_KERNEL);
189 if (!nd_btt)
190 return NULL;
191
192 nd_btt->id = ida_simple_get(&nd_region->btt_ida, 0, 0, GFP_KERNEL);
193 if (nd_btt->id < 0) {
194 kfree(nd_btt);
195 return NULL;
196 }
197
198 nd_btt->lbasize = lbasize;
199 if (uuid)
200 uuid = kmemdup(uuid, 16, GFP_KERNEL);
201 nd_btt->uuid = uuid;
202 dev = &nd_btt->dev;
203 dev_set_name(dev, "btt%d.%d", nd_region->id, nd_btt->id);
204 dev->parent = &nd_region->dev;
205 dev->type = &nd_btt_device_type;
206 dev->groups = nd_btt_attribute_groups;
207 device_initialize(&nd_btt->dev);
208 if (ndns && !__nd_attach_ndns(&nd_btt->dev, ndns, &nd_btt->ndns)) {
209 dev_dbg(&ndns->dev, "%s failed, already claimed by %s\n",
210 __func__, dev_name(ndns->claim));
211 put_device(dev);
212 return NULL;
213 }
214 return dev;
215}
216
217struct device *nd_btt_create(struct nd_region *nd_region)
218{
219 struct device *dev = __nd_btt_create(nd_region, 0, NULL, NULL);
220
221 __nd_device_register(dev);
222 return dev;
223}
224
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236
237bool nd_btt_arena_is_valid(struct nd_btt *nd_btt, struct btt_sb *super)
238{
239 const u8 *parent_uuid = nd_dev_to_uuid(&nd_btt->ndns->dev);
240 u64 checksum;
241
242 if (memcmp(super->signature, BTT_SIG, BTT_SIG_LEN) != 0)
243 return false;
244
245 if (!guid_is_null((guid_t *)&super->parent_uuid))
246 if (memcmp(super->parent_uuid, parent_uuid, 16) != 0)
247 return false;
248
249 checksum = le64_to_cpu(super->checksum);
250 super->checksum = 0;
251 if (checksum != nd_sb_checksum((struct nd_gen_sb *) super))
252 return false;
253 super->checksum = cpu_to_le64(checksum);
254
255
256 if ((le32_to_cpu(super->flags) & IB_FLAG_ERROR_MASK) != 0)
257 dev_info(&nd_btt->dev, "Found arena with an error flag\n");
258
259 return true;
260}
261EXPORT_SYMBOL(nd_btt_arena_is_valid);
262
263int nd_btt_version(struct nd_btt *nd_btt, struct nd_namespace_common *ndns,
264 struct btt_sb *btt_sb)
265{
266 if (ndns->claim_class == NVDIMM_CCLASS_BTT2) {
267
268 nd_btt->initial_offset = 0;
269 nd_btt->version_major = 2;
270 nd_btt->version_minor = 0;
271 if (nvdimm_read_bytes(ndns, 0, btt_sb, sizeof(*btt_sb), 0))
272 return -ENXIO;
273 if (!nd_btt_arena_is_valid(nd_btt, btt_sb))
274 return -ENODEV;
275 if ((le16_to_cpu(btt_sb->version_major) != 2) ||
276 (le16_to_cpu(btt_sb->version_minor) != 0))
277 return -ENODEV;
278 } else {
279
280
281
282
283 nd_btt->initial_offset = SZ_4K;
284 nd_btt->version_major = 1;
285 nd_btt->version_minor = 1;
286 if (nvdimm_read_bytes(ndns, SZ_4K, btt_sb, sizeof(*btt_sb), 0))
287 return -ENXIO;
288 if (!nd_btt_arena_is_valid(nd_btt, btt_sb))
289 return -ENODEV;
290 if ((le16_to_cpu(btt_sb->version_major) != 1) ||
291 (le16_to_cpu(btt_sb->version_minor) != 1))
292 return -ENODEV;
293 }
294 return 0;
295}
296EXPORT_SYMBOL(nd_btt_version);
297
298static int __nd_btt_probe(struct nd_btt *nd_btt,
299 struct nd_namespace_common *ndns, struct btt_sb *btt_sb)
300{
301 int rc;
302
303 if (!btt_sb || !ndns || !nd_btt)
304 return -ENODEV;
305
306 if (nvdimm_namespace_capacity(ndns) < SZ_16M)
307 return -ENXIO;
308
309 rc = nd_btt_version(nd_btt, ndns, btt_sb);
310 if (rc < 0)
311 return rc;
312
313 nd_btt->lbasize = le32_to_cpu(btt_sb->external_lbasize);
314 nd_btt->uuid = kmemdup(btt_sb->uuid, 16, GFP_KERNEL);
315 if (!nd_btt->uuid)
316 return -ENOMEM;
317
318 __nd_device_register(&nd_btt->dev);
319
320 return 0;
321}
322
323int nd_btt_probe(struct device *dev, struct nd_namespace_common *ndns)
324{
325 int rc;
326 struct device *btt_dev;
327 struct btt_sb *btt_sb;
328 struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
329
330 if (ndns->force_raw)
331 return -ENODEV;
332
333 switch (ndns->claim_class) {
334 case NVDIMM_CCLASS_NONE:
335 case NVDIMM_CCLASS_BTT:
336 case NVDIMM_CCLASS_BTT2:
337 break;
338 default:
339 return -ENODEV;
340 }
341
342 nvdimm_bus_lock(&ndns->dev);
343 btt_dev = __nd_btt_create(nd_region, 0, NULL, ndns);
344 nvdimm_bus_unlock(&ndns->dev);
345 if (!btt_dev)
346 return -ENOMEM;
347 btt_sb = devm_kzalloc(dev, sizeof(*btt_sb), GFP_KERNEL);
348 rc = __nd_btt_probe(to_nd_btt(btt_dev), ndns, btt_sb);
349 dev_dbg(dev, "%s: btt: %s\n", __func__,
350 rc == 0 ? dev_name(btt_dev) : "<none>");
351 if (rc < 0) {
352 struct nd_btt *nd_btt = to_nd_btt(btt_dev);
353
354 nd_detach_ndns(btt_dev, &nd_btt->ndns);
355 put_device(btt_dev);
356 }
357
358 return rc;
359}
360EXPORT_SYMBOL(nd_btt_probe);
361