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/genhd.h> 8 #include <linux/sizes.h> 9 #include <linux/slab.h> 10 #include <linux/fs.h> 11 #include <linux/mm.h> 12 #include "nd-core.h" 13 #include "btt.h" 14 #include "nd.h" 15 16 static void nd_btt_release(struct device *dev) 17 { 18 struct nd_region *nd_region = to_nd_region(dev->parent); 19 struct nd_btt *nd_btt = to_nd_btt(dev); 20 21 dev_dbg(dev, "trace\n"); 22 nd_detach_ndns(&nd_btt->dev, &nd_btt->ndns); 23 ida_simple_remove(&nd_region->btt_ida, nd_btt->id); 24 kfree(nd_btt->uuid); 25 kfree(nd_btt); 26 } 27 28 static struct device_type nd_btt_device_type = { 29 .name = "nd_btt", 30 .release = nd_btt_release, 31 }; 32 33 bool is_nd_btt(struct device *dev) 34 { 35 return dev->type == &nd_btt_device_type; 36 } 37 EXPORT_SYMBOL(is_nd_btt); 38 39 struct nd_btt *to_nd_btt(struct device *dev) 40 { 41 struct nd_btt *nd_btt = container_of(dev, struct nd_btt, dev); 42 43 WARN_ON(!is_nd_btt(dev)); 44 return nd_btt; 45 } 46 EXPORT_SYMBOL(to_nd_btt); 47 48 static const unsigned long btt_lbasize_supported[] = { 512, 520, 528, 49 4096, 4104, 4160, 4224, 0 }; 50 51 static ssize_t sector_size_show(struct device *dev, 52 struct device_attribute *attr, char *buf) 53 { 54 struct nd_btt *nd_btt = to_nd_btt(dev); 55 56 return nd_size_select_show(nd_btt->lbasize, btt_lbasize_supported, buf); 57 } 58 59 static ssize_t sector_size_store(struct device *dev, 60 struct device_attribute *attr, const char *buf, size_t len) 61 { 62 struct nd_btt *nd_btt = to_nd_btt(dev); 63 ssize_t rc; 64 65 nd_device_lock(dev); 66 nvdimm_bus_lock(dev); 67 rc = nd_size_select_store(dev, buf, &nd_btt->lbasize, 68 btt_lbasize_supported); 69 dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf, 70 buf[len - 1] == '\n' ? "" : "\n"); 71 nvdimm_bus_unlock(dev); 72 nd_device_unlock(dev); 73 74 return rc ? rc : len; 75 } 76 static DEVICE_ATTR_RW(sector_size); 77 78 static ssize_t uuid_show(struct device *dev, 79 struct device_attribute *attr, char *buf) 80 { 81 struct nd_btt *nd_btt = to_nd_btt(dev); 82 83 if (nd_btt->uuid) 84 return sprintf(buf, "%pUb\n", nd_btt->uuid); 85 return sprintf(buf, "\n"); 86 } 87 88 static ssize_t uuid_store(struct device *dev, 89 struct device_attribute *attr, const char *buf, size_t len) 90 { 91 struct nd_btt *nd_btt = to_nd_btt(dev); 92 ssize_t rc; 93 94 nd_device_lock(dev); 95 rc = nd_uuid_store(dev, &nd_btt->uuid, buf, len); 96 dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf, 97 buf[len - 1] == '\n' ? "" : "\n"); 98 nd_device_unlock(dev); 99 100 return rc ? rc : len; 101 } 102 static DEVICE_ATTR_RW(uuid); 103 104 static ssize_t namespace_show(struct device *dev, 105 struct device_attribute *attr, char *buf) 106 { 107 struct nd_btt *nd_btt = to_nd_btt(dev); 108 ssize_t rc; 109 110 nvdimm_bus_lock(dev); 111 rc = sprintf(buf, "%s\n", nd_btt->ndns 112 ? dev_name(&nd_btt->ndns->dev) : ""); 113 nvdimm_bus_unlock(dev); 114 return rc; 115 } 116 117 static ssize_t namespace_store(struct device *dev, 118 struct device_attribute *attr, const char *buf, size_t len) 119 { 120 struct nd_btt *nd_btt = to_nd_btt(dev); 121 ssize_t rc; 122 123 nd_device_lock(dev); 124 nvdimm_bus_lock(dev); 125 rc = nd_namespace_store(dev, &nd_btt->ndns, buf, len); 126 dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf, 127 buf[len - 1] == '\n' ? "" : "\n"); 128 nvdimm_bus_unlock(dev); 129 nd_device_unlock(dev); 130 131 return rc; 132 } 133 static DEVICE_ATTR_RW(namespace); 134 135 static ssize_t size_show(struct device *dev, 136 struct device_attribute *attr, char *buf) 137 { 138 struct nd_btt *nd_btt = to_nd_btt(dev); 139 ssize_t rc; 140 141 nd_device_lock(dev); 142 if (dev->driver) 143 rc = sprintf(buf, "%llu\n", nd_btt->size); 144 else { 145 /* no size to convey if the btt instance is disabled */ 146 rc = -ENXIO; 147 } 148 nd_device_unlock(dev); 149 150 return rc; 151 } 152 static DEVICE_ATTR_RO(size); 153 154 static ssize_t log_zero_flags_show(struct device *dev, 155 struct device_attribute *attr, char *buf) 156 { 157 return sprintf(buf, "Y\n"); 158 } 159 static DEVICE_ATTR_RO(log_zero_flags); 160 161 static struct attribute *nd_btt_attributes[] = { 162 &dev_attr_sector_size.attr, 163 &dev_attr_namespace.attr, 164 &dev_attr_uuid.attr, 165 &dev_attr_size.attr, 166 &dev_attr_log_zero_flags.attr, 167 NULL, 168 }; 169 170 static struct attribute_group nd_btt_attribute_group = { 171 .attrs = nd_btt_attributes, 172 }; 173 174 static 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 }; 180 181 static 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 goto out_nd_btt; 195 196 nd_btt->lbasize = lbasize; 197 if (uuid) { 198 uuid = kmemdup(uuid, 16, GFP_KERNEL); 199 if (!uuid) 200 goto out_put_id; 201 } 202 nd_btt->uuid = uuid; 203 dev = &nd_btt->dev; 204 dev_set_name(dev, "btt%d.%d", nd_region->id, nd_btt->id); 205 dev->parent = &nd_region->dev; 206 dev->type = &nd_btt_device_type; 207 dev->groups = nd_btt_attribute_groups; 208 device_initialize(&nd_btt->dev); 209 if (ndns && !__nd_attach_ndns(&nd_btt->dev, ndns, &nd_btt->ndns)) { 210 dev_dbg(&ndns->dev, "failed, already claimed by %s\n", 211 dev_name(ndns->claim)); 212 put_device(dev); 213 return NULL; 214 } 215 return dev; 216 217 out_put_id: 218 ida_simple_remove(&nd_region->btt_ida, nd_btt->id); 219 220 out_nd_btt: 221 kfree(nd_btt); 222 return NULL; 223 } 224 225 struct device *nd_btt_create(struct nd_region *nd_region) 226 { 227 struct device *dev = __nd_btt_create(nd_region, 0, NULL, NULL); 228 229 __nd_device_register(dev); 230 return dev; 231 } 232 233 /** 234 * nd_btt_arena_is_valid - check if the metadata layout is valid 235 * @nd_btt: device with BTT geometry and backing device info 236 * @super: pointer to the arena's info block being tested 237 * 238 * Check consistency of the btt info block with itself by validating 239 * the checksum, and with the parent namespace by verifying the 240 * parent_uuid contained in the info block with the one supplied in. 241 * 242 * Returns: 243 * false for an invalid info block, true for a valid one 244 */ 245 bool nd_btt_arena_is_valid(struct nd_btt *nd_btt, struct btt_sb *super) 246 { 247 const u8 *parent_uuid = nd_dev_to_uuid(&nd_btt->ndns->dev); 248 u64 checksum; 249 250 if (memcmp(super->signature, BTT_SIG, BTT_SIG_LEN) != 0) 251 return false; 252 253 if (!guid_is_null((guid_t *)&super->parent_uuid)) 254 if (memcmp(super->parent_uuid, parent_uuid, 16) != 0) 255 return false; 256 257 checksum = le64_to_cpu(super->checksum); 258 super->checksum = 0; 259 if (checksum != nd_sb_checksum((struct nd_gen_sb *) super)) 260 return false; 261 super->checksum = cpu_to_le64(checksum); 262 263 /* TODO: figure out action for this */ 264 if ((le32_to_cpu(super->flags) & IB_FLAG_ERROR_MASK) != 0) 265 dev_info(&nd_btt->dev, "Found arena with an error flag\n"); 266 267 return true; 268 } 269 EXPORT_SYMBOL(nd_btt_arena_is_valid); 270 271 int nd_btt_version(struct nd_btt *nd_btt, struct nd_namespace_common *ndns, 272 struct btt_sb *btt_sb) 273 { 274 if (ndns->claim_class == NVDIMM_CCLASS_BTT2) { 275 /* Probe/setup for BTT v2.0 */ 276 nd_btt->initial_offset = 0; 277 nd_btt->version_major = 2; 278 nd_btt->version_minor = 0; 279 if (nvdimm_read_bytes(ndns, 0, btt_sb, sizeof(*btt_sb), 0)) 280 return -ENXIO; 281 if (!nd_btt_arena_is_valid(nd_btt, btt_sb)) 282 return -ENODEV; 283 if ((le16_to_cpu(btt_sb->version_major) != 2) || 284 (le16_to_cpu(btt_sb->version_minor) != 0)) 285 return -ENODEV; 286 } else { 287 /* 288 * Probe/setup for BTT v1.1 (NVDIMM_CCLASS_NONE or 289 * NVDIMM_CCLASS_BTT) 290 */ 291 nd_btt->initial_offset = SZ_4K; 292 nd_btt->version_major = 1; 293 nd_btt->version_minor = 1; 294 if (nvdimm_read_bytes(ndns, SZ_4K, btt_sb, sizeof(*btt_sb), 0)) 295 return -ENXIO; 296 if (!nd_btt_arena_is_valid(nd_btt, btt_sb)) 297 return -ENODEV; 298 if ((le16_to_cpu(btt_sb->version_major) != 1) || 299 (le16_to_cpu(btt_sb->version_minor) != 1)) 300 return -ENODEV; 301 } 302 return 0; 303 } 304 EXPORT_SYMBOL(nd_btt_version); 305 306 static int __nd_btt_probe(struct nd_btt *nd_btt, 307 struct nd_namespace_common *ndns, struct btt_sb *btt_sb) 308 { 309 int rc; 310 311 if (!btt_sb || !ndns || !nd_btt) 312 return -ENODEV; 313 314 if (nvdimm_namespace_capacity(ndns) < SZ_16M) 315 return -ENXIO; 316 317 rc = nd_btt_version(nd_btt, ndns, btt_sb); 318 if (rc < 0) 319 return rc; 320 321 nd_btt->lbasize = le32_to_cpu(btt_sb->external_lbasize); 322 nd_btt->uuid = kmemdup(btt_sb->uuid, 16, GFP_KERNEL); 323 if (!nd_btt->uuid) 324 return -ENOMEM; 325 326 __nd_device_register(&nd_btt->dev); 327 328 return 0; 329 } 330 331 int nd_btt_probe(struct device *dev, struct nd_namespace_common *ndns) 332 { 333 int rc; 334 struct device *btt_dev; 335 struct btt_sb *btt_sb; 336 struct nd_region *nd_region = to_nd_region(ndns->dev.parent); 337 338 if (ndns->force_raw) 339 return -ENODEV; 340 341 switch (ndns->claim_class) { 342 case NVDIMM_CCLASS_NONE: 343 case NVDIMM_CCLASS_BTT: 344 case NVDIMM_CCLASS_BTT2: 345 break; 346 default: 347 return -ENODEV; 348 } 349 350 nvdimm_bus_lock(&ndns->dev); 351 btt_dev = __nd_btt_create(nd_region, 0, NULL, ndns); 352 nvdimm_bus_unlock(&ndns->dev); 353 if (!btt_dev) 354 return -ENOMEM; 355 btt_sb = devm_kzalloc(dev, sizeof(*btt_sb), GFP_KERNEL); 356 rc = __nd_btt_probe(to_nd_btt(btt_dev), ndns, btt_sb); 357 dev_dbg(dev, "btt: %s\n", rc == 0 ? dev_name(btt_dev) : "<none>"); 358 if (rc < 0) { 359 struct nd_btt *nd_btt = to_nd_btt(btt_dev); 360 361 nd_detach_ndns(btt_dev, &nd_btt->ndns); 362 put_device(btt_dev); 363 } 364 365 return rc; 366 } 367 EXPORT_SYMBOL(nd_btt_probe); 368