Merge tag 'driver-core-6.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-microblaze.git] / drivers / nvdimm / btt_devs.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
4  */
5 #include <linux/blkdev.h>
6 #include <linux/device.h>
7 #include <linux/sizes.h>
8 #include <linux/slab.h>
9 #include <linux/fs.h>
10 #include <linux/mm.h>
11 #include "nd-core.h"
12 #include "btt.h"
13 #include "nd.h"
14
15 static void nd_btt_release(struct device *dev)
16 {
17         struct nd_region *nd_region = to_nd_region(dev->parent);
18         struct nd_btt *nd_btt = to_nd_btt(dev);
19
20         dev_dbg(dev, "trace\n");
21         nd_detach_ndns(&nd_btt->dev, &nd_btt->ndns);
22         ida_simple_remove(&nd_region->btt_ida, nd_btt->id);
23         kfree(nd_btt->uuid);
24         kfree(nd_btt);
25 }
26
27 struct nd_btt *to_nd_btt(struct device *dev)
28 {
29         struct nd_btt *nd_btt = container_of(dev, struct nd_btt, dev);
30
31         WARN_ON(!is_nd_btt(dev));
32         return nd_btt;
33 }
34 EXPORT_SYMBOL(to_nd_btt);
35
36 static const unsigned long btt_lbasize_supported[] = { 512, 520, 528,
37         4096, 4104, 4160, 4224, 0 };
38
39 static ssize_t sector_size_show(struct device *dev,
40                 struct device_attribute *attr, char *buf)
41 {
42         struct nd_btt *nd_btt = to_nd_btt(dev);
43
44         return nd_size_select_show(nd_btt->lbasize, btt_lbasize_supported, buf);
45 }
46
47 static ssize_t sector_size_store(struct device *dev,
48                 struct device_attribute *attr, const char *buf, size_t len)
49 {
50         struct nd_btt *nd_btt = to_nd_btt(dev);
51         ssize_t rc;
52
53         device_lock(dev);
54         nvdimm_bus_lock(dev);
55         rc = nd_size_select_store(dev, buf, &nd_btt->lbasize,
56                         btt_lbasize_supported);
57         dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
58                         buf[len - 1] == '\n' ? "" : "\n");
59         nvdimm_bus_unlock(dev);
60         device_unlock(dev);
61
62         return rc ? rc : len;
63 }
64 static DEVICE_ATTR_RW(sector_size);
65
66 static ssize_t uuid_show(struct device *dev,
67                 struct device_attribute *attr, char *buf)
68 {
69         struct nd_btt *nd_btt = to_nd_btt(dev);
70
71         if (nd_btt->uuid)
72                 return sprintf(buf, "%pUb\n", nd_btt->uuid);
73         return sprintf(buf, "\n");
74 }
75
76 static ssize_t uuid_store(struct device *dev,
77                 struct device_attribute *attr, const char *buf, size_t len)
78 {
79         struct nd_btt *nd_btt = to_nd_btt(dev);
80         ssize_t rc;
81
82         device_lock(dev);
83         rc = nd_uuid_store(dev, &nd_btt->uuid, buf, len);
84         dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
85                         buf[len - 1] == '\n' ? "" : "\n");
86         device_unlock(dev);
87
88         return rc ? rc : len;
89 }
90 static DEVICE_ATTR_RW(uuid);
91
92 static ssize_t namespace_show(struct device *dev,
93                 struct device_attribute *attr, char *buf)
94 {
95         struct nd_btt *nd_btt = to_nd_btt(dev);
96         ssize_t rc;
97
98         nvdimm_bus_lock(dev);
99         rc = sprintf(buf, "%s\n", nd_btt->ndns
100                         ? dev_name(&nd_btt->ndns->dev) : "");
101         nvdimm_bus_unlock(dev);
102         return rc;
103 }
104
105 static ssize_t namespace_store(struct device *dev,
106                 struct device_attribute *attr, const char *buf, size_t len)
107 {
108         struct nd_btt *nd_btt = to_nd_btt(dev);
109         ssize_t rc;
110
111         device_lock(dev);
112         nvdimm_bus_lock(dev);
113         rc = nd_namespace_store(dev, &nd_btt->ndns, buf, len);
114         dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
115                         buf[len - 1] == '\n' ? "" : "\n");
116         nvdimm_bus_unlock(dev);
117         device_unlock(dev);
118
119         return rc;
120 }
121 static DEVICE_ATTR_RW(namespace);
122
123 static ssize_t size_show(struct device *dev,
124                 struct device_attribute *attr, char *buf)
125 {
126         struct nd_btt *nd_btt = to_nd_btt(dev);
127         ssize_t rc;
128
129         device_lock(dev);
130         if (dev->driver)
131                 rc = sprintf(buf, "%llu\n", nd_btt->size);
132         else {
133                 /* no size to convey if the btt instance is disabled */
134                 rc = -ENXIO;
135         }
136         device_unlock(dev);
137
138         return rc;
139 }
140 static DEVICE_ATTR_RO(size);
141
142 static ssize_t log_zero_flags_show(struct device *dev,
143                 struct device_attribute *attr, char *buf)
144 {
145         return sprintf(buf, "Y\n");
146 }
147 static DEVICE_ATTR_RO(log_zero_flags);
148
149 static struct attribute *nd_btt_attributes[] = {
150         &dev_attr_sector_size.attr,
151         &dev_attr_namespace.attr,
152         &dev_attr_uuid.attr,
153         &dev_attr_size.attr,
154         &dev_attr_log_zero_flags.attr,
155         NULL,
156 };
157
158 static struct attribute_group nd_btt_attribute_group = {
159         .attrs = nd_btt_attributes,
160 };
161
162 static const struct attribute_group *nd_btt_attribute_groups[] = {
163         &nd_btt_attribute_group,
164         &nd_device_attribute_group,
165         &nd_numa_attribute_group,
166         NULL,
167 };
168
169 static const struct device_type nd_btt_device_type = {
170         .name = "nd_btt",
171         .release = nd_btt_release,
172         .groups = nd_btt_attribute_groups,
173 };
174
175 bool is_nd_btt(struct device *dev)
176 {
177         return dev->type == &nd_btt_device_type;
178 }
179 EXPORT_SYMBOL(is_nd_btt);
180
181 static struct lock_class_key nvdimm_btt_key;
182
183 static struct device *__nd_btt_create(struct nd_region *nd_region,
184                                       unsigned long lbasize, uuid_t *uuid,
185                                       struct nd_namespace_common *ndns)
186 {
187         struct nd_btt *nd_btt;
188         struct device *dev;
189
190         nd_btt = kzalloc(sizeof(*nd_btt), GFP_KERNEL);
191         if (!nd_btt)
192                 return NULL;
193
194         nd_btt->id = ida_simple_get(&nd_region->btt_ida, 0, 0, GFP_KERNEL);
195         if (nd_btt->id < 0)
196                 goto out_nd_btt;
197
198         nd_btt->lbasize = lbasize;
199         if (uuid) {
200                 uuid = kmemdup(uuid, 16, GFP_KERNEL);
201                 if (!uuid)
202                         goto out_put_id;
203         }
204         nd_btt->uuid = uuid;
205         dev = &nd_btt->dev;
206         dev_set_name(dev, "btt%d.%d", nd_region->id, nd_btt->id);
207         dev->parent = &nd_region->dev;
208         dev->type = &nd_btt_device_type;
209         device_initialize(&nd_btt->dev);
210         lockdep_set_class(&nd_btt->dev.mutex, &nvdimm_btt_key);
211         if (ndns && !__nd_attach_ndns(&nd_btt->dev, ndns, &nd_btt->ndns)) {
212                 dev_dbg(&ndns->dev, "failed, already claimed by %s\n",
213                                 dev_name(ndns->claim));
214                 put_device(dev);
215                 return NULL;
216         }
217         return dev;
218
219 out_put_id:
220         ida_simple_remove(&nd_region->btt_ida, nd_btt->id);
221
222 out_nd_btt:
223         kfree(nd_btt);
224         return NULL;
225 }
226
227 struct device *nd_btt_create(struct nd_region *nd_region)
228 {
229         struct device *dev = __nd_btt_create(nd_region, 0, NULL, NULL);
230
231         nd_device_register(dev);
232         return dev;
233 }
234
235 /**
236  * nd_btt_arena_is_valid - check if the metadata layout is valid
237  * @nd_btt:     device with BTT geometry and backing device info
238  * @super:      pointer to the arena's info block being tested
239  *
240  * Check consistency of the btt info block with itself by validating
241  * the checksum, and with the parent namespace by verifying the
242  * parent_uuid contained in the info block with the one supplied in.
243  *
244  * Returns:
245  * false for an invalid info block, true for a valid one
246  */
247 bool nd_btt_arena_is_valid(struct nd_btt *nd_btt, struct btt_sb *super)
248 {
249         const uuid_t *ns_uuid = nd_dev_to_uuid(&nd_btt->ndns->dev);
250         uuid_t parent_uuid;
251         u64 checksum;
252
253         if (memcmp(super->signature, BTT_SIG, BTT_SIG_LEN) != 0)
254                 return false;
255
256         import_uuid(&parent_uuid, super->parent_uuid);
257         if (!uuid_is_null(&parent_uuid))
258                 if (!uuid_equal(&parent_uuid, ns_uuid))
259                         return false;
260
261         checksum = le64_to_cpu(super->checksum);
262         super->checksum = 0;
263         if (checksum != nd_sb_checksum((struct nd_gen_sb *) super))
264                 return false;
265         super->checksum = cpu_to_le64(checksum);
266
267         /* TODO: figure out action for this */
268         if ((le32_to_cpu(super->flags) & IB_FLAG_ERROR_MASK) != 0)
269                 dev_info(&nd_btt->dev, "Found arena with an error flag\n");
270
271         return true;
272 }
273 EXPORT_SYMBOL(nd_btt_arena_is_valid);
274
275 int nd_btt_version(struct nd_btt *nd_btt, struct nd_namespace_common *ndns,
276                 struct btt_sb *btt_sb)
277 {
278         if (ndns->claim_class == NVDIMM_CCLASS_BTT2) {
279                 /* Probe/setup for BTT v2.0 */
280                 nd_btt->initial_offset = 0;
281                 nd_btt->version_major = 2;
282                 nd_btt->version_minor = 0;
283                 if (nvdimm_read_bytes(ndns, 0, btt_sb, sizeof(*btt_sb), 0))
284                         return -ENXIO;
285                 if (!nd_btt_arena_is_valid(nd_btt, btt_sb))
286                         return -ENODEV;
287                 if ((le16_to_cpu(btt_sb->version_major) != 2) ||
288                                 (le16_to_cpu(btt_sb->version_minor) != 0))
289                         return -ENODEV;
290         } else {
291                 /*
292                  * Probe/setup for BTT v1.1 (NVDIMM_CCLASS_NONE or
293                  * NVDIMM_CCLASS_BTT)
294                  */
295                 nd_btt->initial_offset = SZ_4K;
296                 nd_btt->version_major = 1;
297                 nd_btt->version_minor = 1;
298                 if (nvdimm_read_bytes(ndns, SZ_4K, btt_sb, sizeof(*btt_sb), 0))
299                         return -ENXIO;
300                 if (!nd_btt_arena_is_valid(nd_btt, btt_sb))
301                         return -ENODEV;
302                 if ((le16_to_cpu(btt_sb->version_major) != 1) ||
303                                 (le16_to_cpu(btt_sb->version_minor) != 1))
304                         return -ENODEV;
305         }
306         return 0;
307 }
308 EXPORT_SYMBOL(nd_btt_version);
309
310 static int __nd_btt_probe(struct nd_btt *nd_btt,
311                 struct nd_namespace_common *ndns, struct btt_sb *btt_sb)
312 {
313         int rc;
314
315         if (!btt_sb || !ndns || !nd_btt)
316                 return -ENODEV;
317
318         if (nvdimm_namespace_capacity(ndns) < SZ_16M)
319                 return -ENXIO;
320
321         rc = nd_btt_version(nd_btt, ndns, btt_sb);
322         if (rc < 0)
323                 return rc;
324
325         nd_btt->lbasize = le32_to_cpu(btt_sb->external_lbasize);
326         nd_btt->uuid = kmemdup(&btt_sb->uuid, sizeof(uuid_t), GFP_KERNEL);
327         if (!nd_btt->uuid)
328                 return -ENOMEM;
329
330         nd_device_register(&nd_btt->dev);
331
332         return 0;
333 }
334
335 int nd_btt_probe(struct device *dev, struct nd_namespace_common *ndns)
336 {
337         int rc;
338         struct device *btt_dev;
339         struct btt_sb *btt_sb;
340         struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
341
342         if (ndns->force_raw)
343                 return -ENODEV;
344
345         switch (ndns->claim_class) {
346         case NVDIMM_CCLASS_NONE:
347         case NVDIMM_CCLASS_BTT:
348         case NVDIMM_CCLASS_BTT2:
349                 break;
350         default:
351                 return -ENODEV;
352         }
353
354         nvdimm_bus_lock(&ndns->dev);
355         btt_dev = __nd_btt_create(nd_region, 0, NULL, ndns);
356         nvdimm_bus_unlock(&ndns->dev);
357         if (!btt_dev)
358                 return -ENOMEM;
359         btt_sb = devm_kzalloc(dev, sizeof(*btt_sb), GFP_KERNEL);
360         rc = __nd_btt_probe(to_nd_btt(btt_dev), ndns, btt_sb);
361         dev_dbg(dev, "btt: %s\n", rc == 0 ? dev_name(btt_dev) : "<none>");
362         if (rc < 0) {
363                 struct nd_btt *nd_btt = to_nd_btt(btt_dev);
364
365                 nd_detach_ndns(btt_dev, &nd_btt->ndns);
366                 put_device(btt_dev);
367         }
368
369         return rc;
370 }
371 EXPORT_SYMBOL(nd_btt_probe);