drivers/nvdimm/namespace_devs.c

   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/module.h>
  14 #include <linux/device.h>
  15 #include <linux/sort.h>
  16 #include <linux/slab.h>
  17 #include <linux/list.h>
  18 #include <linux/nd.h>
  19 #include "nd-core.h"
  20 #include "pmem.h"
  21 #include "nd.h"
  22
  23 static void namespace_io_release(struct device *dev)
  24 {
  25         struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
  26
  27         kfree(nsio);
  28 }
  29
  30 static void namespace_pmem_release(struct device *dev)
  31 {
  32         struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
  33         struct nd_region *nd_region = to_nd_region(dev->parent);
  34
  35         if (nspm->id >= 0)
  36                 ida_simple_remove(&nd_region->ns_ida, nspm->id);
  37         kfree(nspm->alt_name);
  38         kfree(nspm->uuid);
  39         kfree(nspm);
  40 }
  41
  42 static void namespace_blk_release(struct device *dev)
  43 {
  44         struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
  45         struct nd_region *nd_region = to_nd_region(dev->parent);
  46
  47         if (nsblk->id >= 0)
  48                 ida_simple_remove(&nd_region->ns_ida, nsblk->id);
  49         kfree(nsblk->alt_name);
  50         kfree(nsblk->uuid);
  51         kfree(nsblk->res);
  52         kfree(nsblk);
  53 }
  54
  55 static const struct device_type namespace_io_device_type = {
  56         .name = "nd_namespace_io",
  57         .release = namespace_io_release,
  58 };
  59
  60 static const struct device_type namespace_pmem_device_type = {
  61         .name = "nd_namespace_pmem",
  62         .release = namespace_pmem_release,
  63 };
  64
  65 static const struct device_type namespace_blk_device_type = {
  66         .name = "nd_namespace_blk",
  67         .release = namespace_blk_release,
  68 };
  69
  70 static bool is_namespace_pmem(const struct device *dev)
  71 {
  72         return dev ? dev->type == &namespace_pmem_device_type : false;
  73 }
  74
  75 static bool is_namespace_blk(const struct device *dev)
  76 {
  77         return dev ? dev->type == &namespace_blk_device_type : false;
  78 }
  79
  80 static bool is_namespace_io(const struct device *dev)
  81 {
  82         return dev ? dev->type == &namespace_io_device_type : false;
  83 }
  84
  85 static int is_uuid_busy(struct device *dev, void *data)
  86 {
  87         u8 *uuid1 = data, *uuid2 = NULL;
  88
  89         if (is_namespace_pmem(dev)) {
  90                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
  91
  92                 uuid2 = nspm->uuid;
  93         } else if (is_namespace_blk(dev)) {
  94                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
  95
  96                 uuid2 = nsblk->uuid;
  97         } else if (is_nd_btt(dev)) {
  98                 struct nd_btt *nd_btt = to_nd_btt(dev);
  99
 100                 uuid2 = nd_btt->uuid;
 101         } else if (is_nd_pfn(dev)) {
 102                 struct nd_pfn *nd_pfn = to_nd_pfn(dev);
 103
 104                 uuid2 = nd_pfn->uuid;
 105         }
 106
 107         if (uuid2 && memcmp(uuid1, uuid2, NSLABEL_UUID_LEN) == 0)
 108                 return -EBUSY;
 109
 110         return 0;
 111 }
 112
 113 static int is_namespace_uuid_busy(struct device *dev, void *data)
 114 {
 115         if (is_nd_region(dev))
 116                 return device_for_each_child(dev, data, is_uuid_busy);
 117         return 0;
 118 }
 119
 120 /**
 121  * nd_is_uuid_unique - verify that no other namespace has @uuid
 122  * @dev: any device on a nvdimm_bus
 123  * @uuid: uuid to check
 124  */
 125 bool nd_is_uuid_unique(struct device *dev, u8 *uuid)
 126 {
 127         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
 128
 129         if (!nvdimm_bus)
 130                 return false;
 131         WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm_bus->dev));
 132         if (device_for_each_child(&nvdimm_bus->dev, uuid,
 133                                 is_namespace_uuid_busy) != 0)
 134                 return false;
 135         return true;
 136 }
 137
 138 bool pmem_should_map_pages(struct device *dev)
 139 {
 140         struct nd_region *nd_region = to_nd_region(dev->parent);
 141         struct nd_namespace_common *ndns = to_ndns(dev);
 142         struct nd_namespace_io *nsio;
 143
 144         if (!IS_ENABLED(CONFIG_ZONE_DEVICE))
 145                 return false;
 146
 147         if (!test_bit(ND_REGION_PAGEMAP, &nd_region->flags))
 148                 return false;
 149
 150         if (is_nd_pfn(dev) || is_nd_btt(dev))
 151                 return false;
 152
 153         if (ndns->force_raw)
 154                 return false;
 155
 156         nsio = to_nd_namespace_io(dev);
 157         if (region_intersects(nsio->res.start, resource_size(&nsio->res),
 158                                 IORESOURCE_SYSTEM_RAM,
 159                                 IORES_DESC_NONE) == REGION_MIXED)
 160                 return false;
 161
 162         return ARCH_MEMREMAP_PMEM == MEMREMAP_WB;
 163 }
 164 EXPORT_SYMBOL(pmem_should_map_pages);
 165
 166 unsigned int pmem_sector_size(struct nd_namespace_common *ndns)
 167 {
 168         if (is_namespace_pmem(&ndns->dev)) {
 169                 struct nd_namespace_pmem *nspm;
 170
 171                 nspm = to_nd_namespace_pmem(&ndns->dev);
 172                 if (nspm->lbasize == 0 || nspm->lbasize == 512)
 173                         /* default */;
 174                 else if (nspm->lbasize == 4096)
 175                         return 4096;
 176                 else
 177                         dev_WARN(&ndns->dev, "unsupported sector size: %ld\n",
 178                                         nspm->lbasize);
 179         }
 180
 181         /*
 182          * There is no namespace label (is_namespace_io()), or the label
 183          * indicates the default sector size.
 184          */
 185         return 512;
 186 }
 187 EXPORT_SYMBOL(pmem_sector_size);
 188
 189 const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
 190                 char *name)
 191 {
 192         struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
 193         const char *suffix = NULL;
 194
 195         if (ndns->claim && is_nd_btt(ndns->claim))
 196                 suffix = "s";
 197
 198         if (is_namespace_pmem(&ndns->dev) || is_namespace_io(&ndns->dev)) {
 199                 int nsidx = 0;
 200
 201                 if (is_namespace_pmem(&ndns->dev)) {
 202                         struct nd_namespace_pmem *nspm;
 203
 204                         nspm = to_nd_namespace_pmem(&ndns->dev);
 205                         nsidx = nspm->id;
 206                 }
 207
 208                 if (nsidx)
 209                         sprintf(name, "pmem%d.%d%s", nd_region->id, nsidx,
 210                                         suffix ? suffix : "");
 211                 else
 212                         sprintf(name, "pmem%d%s", nd_region->id,
 213                                         suffix ? suffix : "");
 214         } else if (is_namespace_blk(&ndns->dev)) {
 215                 struct nd_namespace_blk *nsblk;
 216
 217                 nsblk = to_nd_namespace_blk(&ndns->dev);
 218                 sprintf(name, "ndblk%d.%d%s", nd_region->id, nsblk->id,
 219                                 suffix ? suffix : "");
 220         } else {
 221                 return NULL;
 222         }
 223
 224         return name;
 225 }
 226 EXPORT_SYMBOL(nvdimm_namespace_disk_name);
 227
 228 const u8 *nd_dev_to_uuid(struct device *dev)
 229 {
 230         static const u8 null_uuid[16];
 231
 232         if (!dev)
 233                 return null_uuid;
 234
 235         if (is_namespace_pmem(dev)) {
 236                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
 237
 238                 return nspm->uuid;
 239         } else if (is_namespace_blk(dev)) {
 240                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 241
 242                 return nsblk->uuid;
 243         } else
 244                 return null_uuid;
 245 }
 246 EXPORT_SYMBOL(nd_dev_to_uuid);
 247
 248 static ssize_t nstype_show(struct device *dev,
 249                 struct device_attribute *attr, char *buf)
 250 {
 251         struct nd_region *nd_region = to_nd_region(dev->parent);
 252
 253         return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region));
 254 }
 255 static DEVICE_ATTR_RO(nstype);
 256
 257 static ssize_t __alt_name_store(struct device *dev, const char *buf,
 258                 const size_t len)
 259 {
 260         char *input, *pos, *alt_name, **ns_altname;
 261         ssize_t rc;
 262
 263         if (is_namespace_pmem(dev)) {
 264                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
 265
 266                 ns_altname = &nspm->alt_name;
 267         } else if (is_namespace_blk(dev)) {
 268                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 269
 270                 ns_altname = &nsblk->alt_name;
 271         } else
 272                 return -ENXIO;
 273
 274         if (dev->driver || to_ndns(dev)->claim)
 275                 return -EBUSY;
 276
 277         input = kstrndup(buf, len, GFP_KERNEL);
 278         if (!input)
 279                 return -ENOMEM;
 280
 281         pos = strim(input);
 282         if (strlen(pos) + 1 > NSLABEL_NAME_LEN) {
 283                 rc = -EINVAL;
 284                 goto out;
 285         }
 286
 287         alt_name = kzalloc(NSLABEL_NAME_LEN, GFP_KERNEL);
 288         if (!alt_name) {
 289                 rc = -ENOMEM;
 290                 goto out;
 291         }
 292         kfree(*ns_altname);
 293         *ns_altname = alt_name;
 294         sprintf(*ns_altname, "%s", pos);
 295         rc = len;
 296
 297 out:
 298         kfree(input);
 299         return rc;
 300 }
 301
 302 static resource_size_t nd_namespace_blk_size(struct nd_namespace_blk *nsblk)
 303 {
 304         struct nd_region *nd_region = to_nd_region(nsblk->common.dev.parent);
 305         struct nd_mapping *nd_mapping = &nd_region->mapping[0];
 306         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 307         struct nd_label_id label_id;
 308         resource_size_t size = 0;
 309         struct resource *res;
 310
 311         if (!nsblk->uuid)
 312                 return 0;
 313         nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
 314         for_each_dpa_resource(ndd, res)
 315                 if (strcmp(res->name, label_id.id) == 0)
 316                         size += resource_size(res);
 317         return size;
 318 }
 319
 320 static bool __nd_namespace_blk_validate(struct nd_namespace_blk *nsblk)
 321 {
 322         struct nd_region *nd_region = to_nd_region(nsblk->common.dev.parent);
 323         struct nd_mapping *nd_mapping = &nd_region->mapping[0];
 324         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 325         struct nd_label_id label_id;
 326         struct resource *res;
 327         int count, i;
 328
 329         if (!nsblk->uuid || !nsblk->lbasize || !ndd)
 330                 return false;
 331
 332         count = 0;
 333         nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
 334         for_each_dpa_resource(ndd, res) {
 335                 if (strcmp(res->name, label_id.id) != 0)
 336                         continue;
 337                 /*
 338                  * Resources with unacknowledged adjustments indicate a
 339                  * failure to update labels
 340                  */
 341                 if (res->flags & DPA_RESOURCE_ADJUSTED)
 342                         return false;
 343                 count++;
 344         }
 345
 346         /* These values match after a successful label update */
 347         if (count != nsblk->num_resources)
 348                 return false;
 349
 350         for (i = 0; i < nsblk->num_resources; i++) {
 351                 struct resource *found = NULL;
 352
 353                 for_each_dpa_resource(ndd, res)
 354                         if (res == nsblk->res[i]) {
 355                                 found = res;
 356                                 break;
 357                         }
 358                 /* stale resource */
 359                 if (!found)
 360                         return false;
 361         }
 362
 363         return true;
 364 }
 365
 366 resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk)
 367 {
 368         resource_size_t size;
 369
 370         nvdimm_bus_lock(&nsblk->common.dev);
 371         size = __nd_namespace_blk_validate(nsblk);
 372         nvdimm_bus_unlock(&nsblk->common.dev);
 373
 374         return size;
 375 }
 376 EXPORT_SYMBOL(nd_namespace_blk_validate);
 377
 378
 379 static int nd_namespace_label_update(struct nd_region *nd_region,
 380                 struct device *dev)
 381 {
 382         dev_WARN_ONCE(dev, dev->driver || to_ndns(dev)->claim,
 383                         "namespace must be idle during label update\n");
 384         if (dev->driver || to_ndns(dev)->claim)
 385                 return 0;
 386
 387         /*
 388          * Only allow label writes that will result in a valid namespace
 389          * or deletion of an existing namespace.
 390          */
 391         if (is_namespace_pmem(dev)) {
 392                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
 393                 resource_size_t size = resource_size(&nspm->nsio.res);
 394
 395                 if (size == 0 && nspm->uuid)
 396                         /* delete allocation */;
 397                 else if (!nspm->uuid)
 398                         return 0;
 399
 400                 return nd_pmem_namespace_label_update(nd_region, nspm, size);
 401         } else if (is_namespace_blk(dev)) {
 402                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 403                 resource_size_t size = nd_namespace_blk_size(nsblk);
 404
 405                 if (size == 0 && nsblk->uuid)
 406                         /* delete allocation */;
 407                 else if (!nsblk->uuid || !nsblk->lbasize)
 408                         return 0;
 409
 410                 return nd_blk_namespace_label_update(nd_region, nsblk, size);
 411         } else
 412                 return -ENXIO;
 413 }
 414
 415 static ssize_t alt_name_store(struct device *dev,
 416                 struct device_attribute *attr, const char *buf, size_t len)
 417 {
 418         struct nd_region *nd_region = to_nd_region(dev->parent);
 419         ssize_t rc;
 420
 421         device_lock(dev);
 422         nvdimm_bus_lock(dev);
 423         wait_nvdimm_bus_probe_idle(dev);
 424         rc = __alt_name_store(dev, buf, len);
 425         if (rc >= 0)
 426                 rc = nd_namespace_label_update(nd_region, dev);
 427         dev_dbg(dev, "%s(%zd)\n", rc < 0 ? "fail " : "", rc);
 428         nvdimm_bus_unlock(dev);
 429         device_unlock(dev);
 430
 431         return rc < 0 ? rc : len;
 432 }
 433
 434 static ssize_t alt_name_show(struct device *dev,
 435                 struct device_attribute *attr, char *buf)
 436 {
 437         char *ns_altname;
 438
 439         if (is_namespace_pmem(dev)) {
 440                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
 441
 442                 ns_altname = nspm->alt_name;
 443         } else if (is_namespace_blk(dev)) {
 444                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 445
 446                 ns_altname = nsblk->alt_name;
 447         } else
 448                 return -ENXIO;
 449
 450         return sprintf(buf, "%s\n", ns_altname ? ns_altname : "");
 451 }
 452 static DEVICE_ATTR_RW(alt_name);
 453
 454 static int scan_free(struct nd_region *nd_region,
 455                 struct nd_mapping *nd_mapping, struct nd_label_id *label_id,
 456                 resource_size_t n)
 457 {
 458         bool is_blk = strncmp(label_id->id, "blk", 3) == 0;
 459         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 460         int rc = 0;
 461
 462         while (n) {
 463                 struct resource *res, *last;
 464                 resource_size_t new_start;
 465
 466                 last = NULL;
 467                 for_each_dpa_resource(ndd, res)
 468                         if (strcmp(res->name, label_id->id) == 0)
 469                                 last = res;
 470                 res = last;
 471                 if (!res)
 472                         return 0;
 473
 474                 if (n >= resource_size(res)) {
 475                         n -= resource_size(res);
 476                         nd_dbg_dpa(nd_region, ndd, res, "delete %d\n", rc);
 477                         nvdimm_free_dpa(ndd, res);
 478                         /* retry with last resource deleted */
 479                         continue;
 480                 }
 481
 482                 /*
 483                  * Keep BLK allocations relegated to high DPA as much as
 484                  * possible
 485                  */
 486                 if (is_blk)
 487                         new_start = res->start + n;
 488                 else
 489                         new_start = res->start;
 490
 491                 rc = adjust_resource(res, new_start, resource_size(res) - n);
 492                 if (rc == 0)
 493                         res->flags |= DPA_RESOURCE_ADJUSTED;
 494                 nd_dbg_dpa(nd_region, ndd, res, "shrink %d\n", rc);
 495                 break;
 496         }
 497
 498         return rc;
 499 }
 500
 501 /**
 502  * shrink_dpa_allocation - for each dimm in region free n bytes for label_id
 503  * @nd_region: the set of dimms to reclaim @n bytes from
 504  * @label_id: unique identifier for the namespace consuming this dpa range
 505  * @n: number of bytes per-dimm to release
 506  *
 507  * Assumes resources are ordered.  Starting from the end try to
 508  * adjust_resource() the allocation to @n, but if @n is larger than the
 509  * allocation delete it and find the 'new' last allocation in the label
 510  * set.
 511  */
 512 static int shrink_dpa_allocation(struct nd_region *nd_region,
 513                 struct nd_label_id *label_id, resource_size_t n)
 514 {
 515         int i;
 516
 517         for (i = 0; i < nd_region->ndr_mappings; i++) {
 518                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
 519                 int rc;
 520
 521                 rc = scan_free(nd_region, nd_mapping, label_id, n);
 522                 if (rc)
 523                         return rc;
 524         }
 525
 526         return 0;
 527 }
 528
 529 static resource_size_t init_dpa_allocation(struct nd_label_id *label_id,
 530                 struct nd_region *nd_region, struct nd_mapping *nd_mapping,
 531                 resource_size_t n)
 532 {
 533         bool is_blk = strncmp(label_id->id, "blk", 3) == 0;
 534         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 535         resource_size_t first_dpa;
 536         struct resource *res;
 537         int rc = 0;
 538
 539         /* allocate blk from highest dpa first */
 540         if (is_blk)
 541                 first_dpa = nd_mapping->start + nd_mapping->size - n;
 542         else
 543                 first_dpa = nd_mapping->start;
 544
 545         /* first resource allocation for this label-id or dimm */
 546         res = nvdimm_allocate_dpa(ndd, label_id, first_dpa, n);
 547         if (!res)
 548                 rc = -EBUSY;
 549
 550         nd_dbg_dpa(nd_region, ndd, res, "init %d\n", rc);
 551         return rc ? n : 0;
 552 }
 553
 554
 555 /**
 556  * space_valid() - validate free dpa space against constraints
 557  * @nd_region: hosting region of the free space
 558  * @ndd: dimm device data for debug
 559  * @label_id: namespace id to allocate space
 560  * @prev: potential allocation that precedes free space
 561  * @next: allocation that follows the given free space range
 562  * @exist: first allocation with same id in the mapping
 563  * @n: range that must satisfied for pmem allocations
 564  * @valid: free space range to validate
 565  *
 566  * BLK-space is valid as long as it does not precede a PMEM
 567  * allocation in a given region. PMEM-space must be contiguous
 568  * and adjacent to an existing existing allocation (if one
 569  * exists).  If reserving PMEM any space is valid.
 570  */
 571 static void space_valid(struct nd_region *nd_region, struct nvdimm_drvdata *ndd,
 572                 struct nd_label_id *label_id, struct resource *prev,
 573                 struct resource *next, struct resource *exist,
 574                 resource_size_t n, struct resource *valid)
 575 {
 576         bool is_reserve = strcmp(label_id->id, "pmem-reserve") == 0;
 577         bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
 578
 579         if (valid->start >= valid->end)
 580                 goto invalid;
 581
 582         if (is_reserve)
 583                 return;
 584
 585         if (!is_pmem) {
 586                 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
 587                 struct nvdimm_bus *nvdimm_bus;
 588                 struct blk_alloc_info info = {
 589                         .nd_mapping = nd_mapping,
 590                         .available = nd_mapping->size,
 591                         .res = valid,
 592                 };
 593
 594                 WARN_ON(!is_nd_blk(&nd_region->dev));
 595                 nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
 596                 device_for_each_child(&nvdimm_bus->dev, &info, alias_dpa_busy);
 597                 return;
 598         }
 599
 600         /* allocation needs to be contiguous, so this is all or nothing */
 601         if (resource_size(valid) < n)
 602                 goto invalid;
 603
 604         /* we've got all the space we need and no existing allocation */
 605         if (!exist)
 606                 return;
 607
 608         /* allocation needs to be contiguous with the existing namespace */
 609         if (valid->start == exist->end + 1
 610                         || valid->end == exist->start - 1)
 611                 return;
 612
 613  invalid:
 614         /* truncate @valid size to 0 */
 615         valid->end = valid->start - 1;
 616 }
 617
 618 enum alloc_loc {
 619         ALLOC_ERR = 0, ALLOC_BEFORE, ALLOC_MID, ALLOC_AFTER,
 620 };
 621
 622 static resource_size_t scan_allocate(struct nd_region *nd_region,
 623                 struct nd_mapping *nd_mapping, struct nd_label_id *label_id,
 624                 resource_size_t n)
 625 {
 626         resource_size_t mapping_end = nd_mapping->start + nd_mapping->size - 1;
 627         bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
 628         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 629         struct resource *res, *exist = NULL, valid;
 630         const resource_size_t to_allocate = n;
 631         int first;
 632
 633         for_each_dpa_resource(ndd, res)
 634                 if (strcmp(label_id->id, res->name) == 0)
 635                         exist = res;
 636
 637         valid.start = nd_mapping->start;
 638         valid.end = mapping_end;
 639         valid.name = "free space";
 640  retry:
 641         first = 0;
 642         for_each_dpa_resource(ndd, res) {
 643                 struct resource *next = res->sibling, *new_res = NULL;
 644                 resource_size_t allocate, available = 0;
 645                 enum alloc_loc loc = ALLOC_ERR;
 646                 const char *action;
 647                 int rc = 0;
 648
 649                 /* ignore resources outside this nd_mapping */
 650                 if (res->start > mapping_end)
 651                         continue;
 652                 if (res->end < nd_mapping->start)
 653                         continue;
 654
 655                 /* space at the beginning of the mapping */
 656                 if (!first++ && res->start > nd_mapping->start) {
 657                         valid.start = nd_mapping->start;
 658                         valid.end = res->start - 1;
 659                         space_valid(nd_region, ndd, label_id, NULL, next, exist,
 660                                         to_allocate, &valid);
 661                         available = resource_size(&valid);
 662                         if (available)
 663                                 loc = ALLOC_BEFORE;
 664                 }
 665
 666                 /* space between allocations */
 667                 if (!loc && next) {
 668                         valid.start = res->start + resource_size(res);
 669                         valid.end = min(mapping_end, next->start - 1);
 670                         space_valid(nd_region, ndd, label_id, res, next, exist,
 671                                         to_allocate, &valid);
 672                         available = resource_size(&valid);
 673                         if (available)
 674                                 loc = ALLOC_MID;
 675                 }
 676
 677                 /* space at the end of the mapping */
 678                 if (!loc && !next) {
 679                         valid.start = res->start + resource_size(res);
 680                         valid.end = mapping_end;
 681                         space_valid(nd_region, ndd, label_id, res, next, exist,
 682                                         to_allocate, &valid);
 683                         available = resource_size(&valid);
 684                         if (available)
 685                                 loc = ALLOC_AFTER;
 686                 }
 687
 688                 if (!loc || !available)
 689                         continue;
 690                 allocate = min(available, n);
 691                 switch (loc) {
 692                 case ALLOC_BEFORE:
 693                         if (strcmp(res->name, label_id->id) == 0) {
 694                                 /* adjust current resource up */
 695                                 rc = adjust_resource(res, res->start - allocate,
 696                                                 resource_size(res) + allocate);
 697                                 action = "cur grow up";
 698                         } else
 699                                 action = "allocate";
 700                         break;
 701                 case ALLOC_MID:
 702                         if (strcmp(next->name, label_id->id) == 0) {
 703                                 /* adjust next resource up */
 704                                 rc = adjust_resource(next, next->start
 705                                                 - allocate, resource_size(next)
 706                                                 + allocate);
 707                                 new_res = next;
 708                                 action = "next grow up";
 709                         } else if (strcmp(res->name, label_id->id) == 0) {
 710                                 action = "grow down";
 711                         } else
 712                                 action = "allocate";
 713                         break;
 714                 case ALLOC_AFTER:
 715                         if (strcmp(res->name, label_id->id) == 0)
 716                                 action = "grow down";
 717                         else
 718                                 action = "allocate";
 719                         break;
 720                 default:
 721                         return n;
 722                 }
 723
 724                 if (strcmp(action, "allocate") == 0) {
 725                         /* BLK allocate bottom up */
 726                         if (!is_pmem)
 727                                 valid.start += available - allocate;
 728
 729                         new_res = nvdimm_allocate_dpa(ndd, label_id,
 730                                         valid.start, allocate);
 731                         if (!new_res)
 732                                 rc = -EBUSY;
 733                 } else if (strcmp(action, "grow down") == 0) {
 734                         /* adjust current resource down */
 735                         rc = adjust_resource(res, res->start, resource_size(res)
 736                                         + allocate);
 737                         if (rc == 0)
 738                                 res->flags |= DPA_RESOURCE_ADJUSTED;
 739                 }
 740
 741                 if (!new_res)
 742                         new_res = res;
 743
 744                 nd_dbg_dpa(nd_region, ndd, new_res, "%s(%d) %d\n",
 745                                 action, loc, rc);
 746
 747                 if (rc)
 748                         return n;
 749
 750                 n -= allocate;
 751                 if (n) {
 752                         /*
 753                          * Retry scan with newly inserted resources.
 754                          * For example, if we did an ALLOC_BEFORE
 755                          * insertion there may also have been space
 756                          * available for an ALLOC_AFTER insertion, so we
 757                          * need to check this same resource again
 758                          */
 759                         goto retry;
 760                 } else
 761                         return 0;
 762         }
 763
 764         /*
 765          * If we allocated nothing in the BLK case it may be because we are in
 766          * an initial "pmem-reserve pass".  Only do an initial BLK allocation
 767          * when none of the DPA space is reserved.
 768          */
 769         if ((is_pmem || !ndd->dpa.child) && n == to_allocate)
 770                 return init_dpa_allocation(label_id, nd_region, nd_mapping, n);
 771         return n;
 772 }
 773
 774 static int merge_dpa(struct nd_region *nd_region,
 775                 struct nd_mapping *nd_mapping, struct nd_label_id *label_id)
 776 {
 777         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 778         struct resource *res;
 779
 780         if (strncmp("pmem", label_id->id, 4) == 0)
 781                 return 0;
 782  retry:
 783         for_each_dpa_resource(ndd, res) {
 784                 int rc;
 785                 struct resource *next = res->sibling;
 786                 resource_size_t end = res->start + resource_size(res);
 787
 788                 if (!next || strcmp(res->name, label_id->id) != 0
 789                                 || strcmp(next->name, label_id->id) != 0
 790                                 || end != next->start)
 791                         continue;
 792                 end += resource_size(next);
 793                 nvdimm_free_dpa(ndd, next);
 794                 rc = adjust_resource(res, res->start, end - res->start);
 795                 nd_dbg_dpa(nd_region, ndd, res, "merge %d\n", rc);
 796                 if (rc)
 797                         return rc;
 798                 res->flags |= DPA_RESOURCE_ADJUSTED;
 799                 goto retry;
 800         }
 801
 802         return 0;
 803 }
 804
 805 int __reserve_free_pmem(struct device *dev, void *data)
 806 {
 807         struct nvdimm *nvdimm = data;
 808         struct nd_region *nd_region;
 809         struct nd_label_id label_id;
 810         int i;
 811
 812         if (!is_memory(dev))
 813                 return 0;
 814
 815         nd_region = to_nd_region(dev);
 816         if (nd_region->ndr_mappings == 0)
 817                 return 0;
 818
 819         memset(&label_id, 0, sizeof(label_id));
 820         strcat(label_id.id, "pmem-reserve");
 821         for (i = 0; i < nd_region->ndr_mappings; i++) {
 822                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
 823                 resource_size_t n, rem = 0;
 824
 825                 if (nd_mapping->nvdimm != nvdimm)
 826                         continue;
 827
 828                 n = nd_pmem_available_dpa(nd_region, nd_mapping, &rem);
 829                 if (n == 0)
 830                         return 0;
 831                 rem = scan_allocate(nd_region, nd_mapping, &label_id, n);
 832                 dev_WARN_ONCE(&nd_region->dev, rem,
 833                                 "pmem reserve underrun: %#llx of %#llx bytes\n",
 834                                 (unsigned long long) n - rem,
 835                                 (unsigned long long) n);
 836                 return rem ? -ENXIO : 0;
 837         }
 838
 839         return 0;
 840 }
 841
 842 void release_free_pmem(struct nvdimm_bus *nvdimm_bus,
 843                 struct nd_mapping *nd_mapping)
 844 {
 845         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 846         struct resource *res, *_res;
 847
 848         for_each_dpa_resource_safe(ndd, res, _res)
 849                 if (strcmp(res->name, "pmem-reserve") == 0)
 850                         nvdimm_free_dpa(ndd, res);
 851 }
 852
 853 static int reserve_free_pmem(struct nvdimm_bus *nvdimm_bus,
 854                 struct nd_mapping *nd_mapping)
 855 {
 856         struct nvdimm *nvdimm = nd_mapping->nvdimm;
 857         int rc;
 858
 859         rc = device_for_each_child(&nvdimm_bus->dev, nvdimm,
 860                         __reserve_free_pmem);
 861         if (rc)
 862                 release_free_pmem(nvdimm_bus, nd_mapping);
 863         return rc;
 864 }
 865
 866 /**
 867  * grow_dpa_allocation - for each dimm allocate n bytes for @label_id
 868  * @nd_region: the set of dimms to allocate @n more bytes from
 869  * @label_id: unique identifier for the namespace consuming this dpa range
 870  * @n: number of bytes per-dimm to add to the existing allocation
 871  *
 872  * Assumes resources are ordered.  For BLK regions, first consume
 873  * BLK-only available DPA free space, then consume PMEM-aliased DPA
 874  * space starting at the highest DPA.  For PMEM regions start
 875  * allocations from the start of an interleave set and end at the first
 876  * BLK allocation or the end of the interleave set, whichever comes
 877  * first.
 878  */
 879 static int grow_dpa_allocation(struct nd_region *nd_region,
 880                 struct nd_label_id *label_id, resource_size_t n)
 881 {
 882         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
 883         bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
 884         int i;
 885
 886         for (i = 0; i < nd_region->ndr_mappings; i++) {
 887                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
 888                 resource_size_t rem = n;
 889                 int rc, j;
 890
 891                 /*
 892                  * In the BLK case try once with all unallocated PMEM
 893                  * reserved, and once without
 894                  */
 895                 for (j = is_pmem; j < 2; j++) {
 896                         bool blk_only = j == 0;
 897
 898                         if (blk_only) {
 899                                 rc = reserve_free_pmem(nvdimm_bus, nd_mapping);
 900                                 if (rc)
 901                                         return rc;
 902                         }
 903                         rem = scan_allocate(nd_region, nd_mapping,
 904                                         label_id, rem);
 905                         if (blk_only)
 906                                 release_free_pmem(nvdimm_bus, nd_mapping);
 907
 908                         /* try again and allow encroachments into PMEM */
 909                         if (rem == 0)
 910                                 break;
 911                 }
 912
 913                 dev_WARN_ONCE(&nd_region->dev, rem,
 914                                 "allocation underrun: %#llx of %#llx bytes\n",
 915                                 (unsigned long long) n - rem,
 916                                 (unsigned long long) n);
 917                 if (rem)
 918                         return -ENXIO;
 919
 920                 rc = merge_dpa(nd_region, nd_mapping, label_id);
 921                 if (rc)
 922                         return rc;
 923         }
 924
 925         return 0;
 926 }
 927
 928 static void nd_namespace_pmem_set_resource(struct nd_region *nd_region,
 929                 struct nd_namespace_pmem *nspm, resource_size_t size)
 930 {
 931         struct resource *res = &nspm->nsio.res;
 932         resource_size_t offset = 0;
 933
 934         if (size && !nspm->uuid) {
 935                 WARN_ON_ONCE(1);
 936                 size = 0;
 937         }
 938
 939         if (size && nspm->uuid) {
 940                 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
 941                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 942                 struct nd_label_id label_id;
 943                 struct resource *res;
 944
 945                 if (!ndd) {
 946                         size = 0;
 947                         goto out;
 948                 }
 949
 950                 nd_label_gen_id(&label_id, nspm->uuid, 0);
 951
 952                 /* calculate a spa offset from the dpa allocation offset */
 953                 for_each_dpa_resource(ndd, res)
 954                         if (strcmp(res->name, label_id.id) == 0) {
 955                                 offset = (res->start - nd_mapping->start)
 956                                         * nd_region->ndr_mappings;
 957                                 goto out;
 958                         }
 959
 960                 WARN_ON_ONCE(1);
 961                 size = 0;
 962         }
 963
 964  out:
 965         res->start = nd_region->ndr_start + offset;
 966         res->end = res->start + size - 1;
 967 }
 968
 969 static bool uuid_not_set(const u8 *uuid, struct device *dev, const char *where)
 970 {
 971         if (!uuid) {
 972                 dev_dbg(dev, "%s: uuid not set\n", where);
 973                 return true;
 974         }
 975         return false;
 976 }
 977
 978 static ssize_t __size_store(struct device *dev, unsigned long long val)
 979 {
 980         resource_size_t allocated = 0, available = 0;
 981         struct nd_region *nd_region = to_nd_region(dev->parent);
 982         struct nd_namespace_common *ndns = to_ndns(dev);
 983         struct nd_mapping *nd_mapping;
 984         struct nvdimm_drvdata *ndd;
 985         struct nd_label_id label_id;
 986         u32 flags = 0, remainder;
 987         int rc, i, id = -1;
 988         u8 *uuid = NULL;
 989
 990         if (dev->driver || ndns->claim)
 991                 return -EBUSY;
 992
 993         if (is_namespace_pmem(dev)) {
 994                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
 995
 996                 uuid = nspm->uuid;
 997                 id = nspm->id;
 998         } else if (is_namespace_blk(dev)) {
 999                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1000
1001                 uuid = nsblk->uuid;
1002                 flags = NSLABEL_FLAG_LOCAL;
1003                 id = nsblk->id;
1004         }
1005
1006         /*
1007          * We need a uuid for the allocation-label and dimm(s) on which
1008          * to store the label.
1009          */
1010         if (uuid_not_set(uuid, dev, __func__))
1011                 return -ENXIO;
1012         if (nd_region->ndr_mappings == 0) {
1013                 dev_dbg(dev, "not associated with dimm(s)\n");
1014                 return -ENXIO;
1015         }
1016
1017         div_u64_rem(val, SZ_4K * nd_region->ndr_mappings, &remainder);
1018         if (remainder) {
1019                 dev_dbg(dev, "%llu is not %dK aligned\n", val,
1020                                 (SZ_4K * nd_region->ndr_mappings) / SZ_1K);
1021                 return -EINVAL;
1022         }
1023
1024         nd_label_gen_id(&label_id, uuid, flags);
1025         for (i = 0; i < nd_region->ndr_mappings; i++) {
1026                 nd_mapping = &nd_region->mapping[i];
1027                 ndd = to_ndd(nd_mapping);
1028
1029                 /*
1030                  * All dimms in an interleave set, or the base dimm for a blk
1031                  * region, need to be enabled for the size to be changed.
1032                  */
1033                 if (!ndd)
1034                         return -ENXIO;
1035
1036                 allocated += nvdimm_allocated_dpa(ndd, &label_id);
1037         }
1038         available = nd_region_allocatable_dpa(nd_region);
1039
1040         if (val > available + allocated)
1041                 return -ENOSPC;
1042
1043         if (val == allocated)
1044                 return 0;
1045
1046         val = div_u64(val, nd_region->ndr_mappings);
1047         allocated = div_u64(allocated, nd_region->ndr_mappings);
1048         if (val < allocated)
1049                 rc = shrink_dpa_allocation(nd_region, &label_id,
1050                                 allocated - val);
1051         else
1052                 rc = grow_dpa_allocation(nd_region, &label_id, val - allocated);
1053
1054         if (rc)
1055                 return rc;
1056
1057         if (is_namespace_pmem(dev)) {
1058                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1059
1060                 nd_namespace_pmem_set_resource(nd_region, nspm,
1061                                 val * nd_region->ndr_mappings);
1062         }
1063
1064         /*
1065          * Try to delete the namespace if we deleted all of its
1066          * allocation, this is not the seed or 0th device for the
1067          * region, and it is not actively claimed by a btt, pfn, or dax
1068          * instance.
1069          */
1070         if (val == 0 && id != 0 && nd_region->ns_seed != dev && !ndns->claim)
1071                 nd_device_unregister(dev, ND_ASYNC);
1072
1073         return rc;
1074 }
1075
1076 static ssize_t size_store(struct device *dev,
1077                 struct device_attribute *attr, const char *buf, size_t len)
1078 {
1079         struct nd_region *nd_region = to_nd_region(dev->parent);
1080         unsigned long long val;
1081         u8 **uuid = NULL;
1082         int rc;
1083
1084         rc = kstrtoull(buf, 0, &val);
1085         if (rc)
1086                 return rc;
1087
1088         device_lock(dev);
1089         nvdimm_bus_lock(dev);
1090         wait_nvdimm_bus_probe_idle(dev);
1091         rc = __size_store(dev, val);
1092         if (rc >= 0)
1093                 rc = nd_namespace_label_update(nd_region, dev);
1094
1095         if (is_namespace_pmem(dev)) {
1096                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1097
1098                 uuid = &nspm->uuid;
1099         } else if (is_namespace_blk(dev)) {
1100                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1101
1102                 uuid = &nsblk->uuid;
1103         }
1104
1105         if (rc == 0 && val == 0 && uuid) {
1106                 /* setting size zero == 'delete namespace' */
1107                 kfree(*uuid);
1108                 *uuid = NULL;
1109         }
1110
1111         dev_dbg(dev, "%llx %s (%d)\n", val, rc < 0 ? "fail" : "success", rc);
1112
1113         nvdimm_bus_unlock(dev);
1114         device_unlock(dev);
1115
1116         return rc < 0 ? rc : len;
1117 }
1118
1119 resource_size_t __nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
1120 {
1121         struct device *dev = &ndns->dev;
1122
1123         if (is_namespace_pmem(dev)) {
1124                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1125
1126                 return resource_size(&nspm->nsio.res);
1127         } else if (is_namespace_blk(dev)) {
1128                 return nd_namespace_blk_size(to_nd_namespace_blk(dev));
1129         } else if (is_namespace_io(dev)) {
1130                 struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
1131
1132                 return resource_size(&nsio->res);
1133         } else
1134                 WARN_ONCE(1, "unknown namespace type\n");
1135         return 0;
1136 }
1137
1138 resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
1139 {
1140         resource_size_t size;
1141
1142         nvdimm_bus_lock(&ndns->dev);
1143         size = __nvdimm_namespace_capacity(ndns);
1144         nvdimm_bus_unlock(&ndns->dev);
1145
1146         return size;
1147 }
1148 EXPORT_SYMBOL(nvdimm_namespace_capacity);
1149
1150 bool nvdimm_namespace_locked(struct nd_namespace_common *ndns)
1151 {
1152         int i;
1153         bool locked = false;
1154         struct device *dev = &ndns->dev;
1155         struct nd_region *nd_region = to_nd_region(dev->parent);
1156
1157         for (i = 0; i < nd_region->ndr_mappings; i++) {
1158                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1159                 struct nvdimm *nvdimm = nd_mapping->nvdimm;
1160
1161                 if (test_bit(NDD_LOCKED, &nvdimm->flags)) {
1162                         dev_dbg(dev, "%s locked\n", nvdimm_name(nvdimm));
1163                         locked = true;
1164                 }
1165         }
1166         return locked;
1167 }
1168 EXPORT_SYMBOL(nvdimm_namespace_locked);
1169
1170 static ssize_t size_show(struct device *dev,
1171                 struct device_attribute *attr, char *buf)
1172 {
1173         return sprintf(buf, "%llu\n", (unsigned long long)
1174                         nvdimm_namespace_capacity(to_ndns(dev)));
1175 }
1176 static DEVICE_ATTR(size, 0444, size_show, size_store);
1177
1178 static u8 *namespace_to_uuid(struct device *dev)
1179 {
1180         if (is_namespace_pmem(dev)) {
1181                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1182
1183                 return nspm->uuid;
1184         } else if (is_namespace_blk(dev)) {
1185                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1186
1187                 return nsblk->uuid;
1188         } else
1189                 return ERR_PTR(-ENXIO);
1190 }
1191
1192 static ssize_t uuid_show(struct device *dev,
1193                 struct device_attribute *attr, char *buf)
1194 {
1195         u8 *uuid = namespace_to_uuid(dev);
1196
1197         if (IS_ERR(uuid))
1198                 return PTR_ERR(uuid);
1199         if (uuid)
1200                 return sprintf(buf, "%pUb\n", uuid);
1201         return sprintf(buf, "\n");
1202 }
1203
1204 /**
1205  * namespace_update_uuid - check for a unique uuid and whether we're "renaming"
1206  * @nd_region: parent region so we can updates all dimms in the set
1207  * @dev: namespace type for generating label_id
1208  * @new_uuid: incoming uuid
1209  * @old_uuid: reference to the uuid storage location in the namespace object
1210  */
1211 static int namespace_update_uuid(struct nd_region *nd_region,
1212                 struct device *dev, u8 *new_uuid, u8 **old_uuid)
1213 {
1214         u32 flags = is_namespace_blk(dev) ? NSLABEL_FLAG_LOCAL : 0;
1215         struct nd_label_id old_label_id;
1216         struct nd_label_id new_label_id;
1217         int i;
1218
1219         if (!nd_is_uuid_unique(dev, new_uuid))
1220                 return -EINVAL;
1221
1222         if (*old_uuid == NULL)
1223                 goto out;
1224
1225         /*
1226          * If we've already written a label with this uuid, then it's
1227          * too late to rename because we can't reliably update the uuid
1228          * without losing the old namespace.  Userspace must delete this
1229          * namespace to abandon the old uuid.
1230          */
1231         for (i = 0; i < nd_region->ndr_mappings; i++) {
1232                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1233
1234                 /*
1235                  * This check by itself is sufficient because old_uuid
1236                  * would be NULL above if this uuid did not exist in the
1237                  * currently written set.
1238                  *
1239                  * FIXME: can we delete uuid with zero dpa allocated?
1240                  */
1241                 if (list_empty(&nd_mapping->labels))
1242                         return -EBUSY;
1243         }
1244
1245         nd_label_gen_id(&old_label_id, *old_uuid, flags);
1246         nd_label_gen_id(&new_label_id, new_uuid, flags);
1247         for (i = 0; i < nd_region->ndr_mappings; i++) {
1248                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1249                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1250                 struct resource *res;
1251
1252                 for_each_dpa_resource(ndd, res)
1253                         if (strcmp(res->name, old_label_id.id) == 0)
1254                                 sprintf((void *) res->name, "%s",
1255                                                 new_label_id.id);
1256         }
1257         kfree(*old_uuid);
1258  out:
1259         *old_uuid = new_uuid;
1260         return 0;
1261 }
1262
1263 static ssize_t uuid_store(struct device *dev,
1264                 struct device_attribute *attr, const char *buf, size_t len)
1265 {
1266         struct nd_region *nd_region = to_nd_region(dev->parent);
1267         u8 *uuid = NULL;
1268         ssize_t rc = 0;
1269         u8 **ns_uuid;
1270
1271         if (is_namespace_pmem(dev)) {
1272                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1273
1274                 ns_uuid = &nspm->uuid;
1275         } else if (is_namespace_blk(dev)) {
1276                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1277
1278                 ns_uuid = &nsblk->uuid;
1279         } else
1280                 return -ENXIO;
1281
1282         device_lock(dev);
1283         nvdimm_bus_lock(dev);
1284         wait_nvdimm_bus_probe_idle(dev);
1285         if (to_ndns(dev)->claim)
1286                 rc = -EBUSY;
1287         if (rc >= 0)
1288                 rc = nd_uuid_store(dev, &uuid, buf, len);
1289         if (rc >= 0)
1290                 rc = namespace_update_uuid(nd_region, dev, uuid, ns_uuid);
1291         if (rc >= 0)
1292                 rc = nd_namespace_label_update(nd_region, dev);
1293         else
1294                 kfree(uuid);
1295         dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
1296                         buf[len - 1] == '\n' ? "" : "\n");
1297         nvdimm_bus_unlock(dev);
1298         device_unlock(dev);
1299
1300         return rc < 0 ? rc : len;
1301 }
1302 static DEVICE_ATTR_RW(uuid);
1303
1304 static ssize_t resource_show(struct device *dev,
1305                 struct device_attribute *attr, char *buf)
1306 {
1307         struct resource *res;
1308
1309         if (is_namespace_pmem(dev)) {
1310                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1311
1312                 res = &nspm->nsio.res;
1313         } else if (is_namespace_io(dev)) {
1314                 struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
1315
1316                 res = &nsio->res;
1317         } else
1318                 return -ENXIO;
1319
1320         /* no address to convey if the namespace has no allocation */
1321         if (resource_size(res) == 0)
1322                 return -ENXIO;
1323         return sprintf(buf, "%#llx\n", (unsigned long long) res->start);
1324 }
1325 static DEVICE_ATTR_RO(resource);
1326
1327 static const unsigned long blk_lbasize_supported[] = { 512, 520, 528,
1328         4096, 4104, 4160, 4224, 0 };
1329
1330 static const unsigned long pmem_lbasize_supported[] = { 512, 4096, 0 };
1331
1332 static ssize_t sector_size_show(struct device *dev,
1333                 struct device_attribute *attr, char *buf)
1334 {
1335         if (is_namespace_blk(dev)) {
1336                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1337
1338                 return nd_size_select_show(nsblk->lbasize,
1339                                 blk_lbasize_supported, buf);
1340         }
1341
1342         if (is_namespace_pmem(dev)) {
1343                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1344
1345                 return nd_size_select_show(nspm->lbasize,
1346                                 pmem_lbasize_supported, buf);
1347         }
1348         return -ENXIO;
1349 }
1350
1351 static ssize_t sector_size_store(struct device *dev,
1352                 struct device_attribute *attr, const char *buf, size_t len)
1353 {
1354         struct nd_region *nd_region = to_nd_region(dev->parent);
1355         const unsigned long *supported;
1356         unsigned long *lbasize;
1357         ssize_t rc = 0;
1358
1359         if (is_namespace_blk(dev)) {
1360                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1361
1362                 lbasize = &nsblk->lbasize;
1363                 supported = blk_lbasize_supported;
1364         } else if (is_namespace_pmem(dev)) {
1365                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1366
1367                 lbasize = &nspm->lbasize;
1368                 supported = pmem_lbasize_supported;
1369         } else
1370                 return -ENXIO;
1371
1372         device_lock(dev);
1373         nvdimm_bus_lock(dev);
1374         if (to_ndns(dev)->claim)
1375                 rc = -EBUSY;
1376         if (rc >= 0)
1377                 rc = nd_size_select_store(dev, buf, lbasize, supported);
1378         if (rc >= 0)
1379                 rc = nd_namespace_label_update(nd_region, dev);
1380         dev_dbg(dev, "result: %zd %s: %s%s", rc, rc < 0 ? "tried" : "wrote",
1381                         buf, buf[len - 1] == '\n' ? "" : "\n");
1382         nvdimm_bus_unlock(dev);
1383         device_unlock(dev);
1384
1385         return rc ? rc : len;
1386 }
1387 static DEVICE_ATTR_RW(sector_size);
1388
1389 static ssize_t dpa_extents_show(struct device *dev,
1390                 struct device_attribute *attr, char *buf)
1391 {
1392         struct nd_region *nd_region = to_nd_region(dev->parent);
1393         struct nd_label_id label_id;
1394         int count = 0, i;
1395         u8 *uuid = NULL;
1396         u32 flags = 0;
1397
1398         nvdimm_bus_lock(dev);
1399         if (is_namespace_pmem(dev)) {
1400                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1401
1402                 uuid = nspm->uuid;
1403                 flags = 0;
1404         } else if (is_namespace_blk(dev)) {
1405                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1406
1407                 uuid = nsblk->uuid;
1408                 flags = NSLABEL_FLAG_LOCAL;
1409         }
1410
1411         if (!uuid)
1412                 goto out;
1413
1414         nd_label_gen_id(&label_id, uuid, flags);
1415         for (i = 0; i < nd_region->ndr_mappings; i++) {
1416                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1417                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1418                 struct resource *res;
1419
1420                 for_each_dpa_resource(ndd, res)
1421                         if (strcmp(res->name, label_id.id) == 0)
1422                                 count++;
1423         }
1424  out:
1425         nvdimm_bus_unlock(dev);
1426
1427         return sprintf(buf, "%d\n", count);
1428 }
1429 static DEVICE_ATTR_RO(dpa_extents);
1430
1431 static int btt_claim_class(struct device *dev)
1432 {
1433         struct nd_region *nd_region = to_nd_region(dev->parent);
1434         int i, loop_bitmask = 0;
1435
1436         for (i = 0; i < nd_region->ndr_mappings; i++) {
1437                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1438                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1439                 struct nd_namespace_index *nsindex;
1440
1441                 /*
1442                  * If any of the DIMMs do not support labels the only
1443                  * possible BTT format is v1.
1444                  */
1445                 if (!ndd) {
1446                         loop_bitmask = 0;
1447                         break;
1448                 }
1449
1450                 nsindex = to_namespace_index(ndd, ndd->ns_current);
1451                 if (nsindex == NULL)
1452                         loop_bitmask |= 1;
1453                 else {
1454                         /* check whether existing labels are v1.1 or v1.2 */
1455                         if (__le16_to_cpu(nsindex->major) == 1
1456                                         && __le16_to_cpu(nsindex->minor) == 1)
1457                                 loop_bitmask |= 2;
1458                         else
1459                                 loop_bitmask |= 4;
1460                 }
1461         }
1462         /*
1463          * If nsindex is null loop_bitmask's bit 0 will be set, and if an index
1464          * block is found, a v1.1 label for any mapping will set bit 1, and a
1465          * v1.2 label will set bit 2.
1466          *
1467          * At the end of the loop, at most one of the three bits must be set.
1468          * If multiple bits were set, it means the different mappings disagree
1469          * about their labels, and this must be cleaned up first.
1470          *
1471          * If all the label index blocks are found to agree, nsindex of NULL
1472          * implies labels haven't been initialized yet, and when they will,
1473          * they will be of the 1.2 format, so we can assume BTT2.0
1474          *
1475          * If 1.1 labels are found, we enforce BTT1.1, and if 1.2 labels are
1476          * found, we enforce BTT2.0
1477          *
1478          * If the loop was never entered, default to BTT1.1 (legacy namespaces)
1479          */
1480         switch (loop_bitmask) {
1481         case 0:
1482         case 2:
1483                 return NVDIMM_CCLASS_BTT;
1484         case 1:
1485         case 4:
1486                 return NVDIMM_CCLASS_BTT2;
1487         default:
1488                 return -ENXIO;
1489         }
1490 }
1491
1492 static ssize_t holder_show(struct device *dev,
1493                 struct device_attribute *attr, char *buf)
1494 {
1495         struct nd_namespace_common *ndns = to_ndns(dev);
1496         ssize_t rc;
1497
1498         device_lock(dev);
1499         rc = sprintf(buf, "%s\n", ndns->claim ? dev_name(ndns->claim) : "");
1500         device_unlock(dev);
1501
1502         return rc;
1503 }
1504 static DEVICE_ATTR_RO(holder);
1505
1506 static ssize_t __holder_class_store(struct device *dev, const char *buf)
1507 {
1508         struct nd_namespace_common *ndns = to_ndns(dev);
1509
1510         if (dev->driver || ndns->claim)
1511                 return -EBUSY;
1512
1513         if (sysfs_streq(buf, "btt"))
1514                 ndns->claim_class = btt_claim_class(dev);
1515         else if (sysfs_streq(buf, "pfn"))
1516                 ndns->claim_class = NVDIMM_CCLASS_PFN;
1517         else if (sysfs_streq(buf, "dax"))
1518                 ndns->claim_class = NVDIMM_CCLASS_DAX;
1519         else if (sysfs_streq(buf, ""))
1520                 ndns->claim_class = NVDIMM_CCLASS_NONE;
1521         else
1522                 return -EINVAL;
1523
1524         /* btt_claim_class() could've returned an error */
1525         if (ndns->claim_class < 0)
1526                 return ndns->claim_class;
1527
1528         return 0;
1529 }
1530
1531 static ssize_t holder_class_store(struct device *dev,
1532                 struct device_attribute *attr, const char *buf, size_t len)
1533 {
1534         struct nd_region *nd_region = to_nd_region(dev->parent);
1535         ssize_t rc;
1536
1537         device_lock(dev);
1538         nvdimm_bus_lock(dev);
1539         wait_nvdimm_bus_probe_idle(dev);
1540         rc = __holder_class_store(dev, buf);
1541         if (rc >= 0)
1542                 rc = nd_namespace_label_update(nd_region, dev);
1543         dev_dbg(dev, "%s(%zd)\n", rc < 0 ? "fail " : "", rc);
1544         nvdimm_bus_unlock(dev);
1545         device_unlock(dev);
1546
1547         return rc < 0 ? rc : len;
1548 }
1549
1550 static ssize_t holder_class_show(struct device *dev,
1551                 struct device_attribute *attr, char *buf)
1552 {
1553         struct nd_namespace_common *ndns = to_ndns(dev);
1554         ssize_t rc;
1555
1556         device_lock(dev);
1557         if (ndns->claim_class == NVDIMM_CCLASS_NONE)
1558                 rc = sprintf(buf, "\n");
1559         else if ((ndns->claim_class == NVDIMM_CCLASS_BTT) ||
1560                         (ndns->claim_class == NVDIMM_CCLASS_BTT2))
1561                 rc = sprintf(buf, "btt\n");
1562         else if (ndns->claim_class == NVDIMM_CCLASS_PFN)
1563                 rc = sprintf(buf, "pfn\n");
1564         else if (ndns->claim_class == NVDIMM_CCLASS_DAX)
1565                 rc = sprintf(buf, "dax\n");
1566         else
1567                 rc = sprintf(buf, "<unknown>\n");
1568         device_unlock(dev);
1569
1570         return rc;
1571 }
1572 static DEVICE_ATTR_RW(holder_class);
1573
1574 static ssize_t mode_show(struct device *dev,
1575                 struct device_attribute *attr, char *buf)
1576 {
1577         struct nd_namespace_common *ndns = to_ndns(dev);
1578         struct device *claim;
1579         char *mode;
1580         ssize_t rc;
1581
1582         device_lock(dev);
1583         claim = ndns->claim;
1584         if (claim && is_nd_btt(claim))
1585                 mode = "safe";
1586         else if (claim && is_nd_pfn(claim))
1587                 mode = "memory";
1588         else if (claim && is_nd_dax(claim))
1589                 mode = "dax";
1590         else if (!claim && pmem_should_map_pages(dev))
1591                 mode = "memory";
1592         else
1593                 mode = "raw";
1594         rc = sprintf(buf, "%s\n", mode);
1595         device_unlock(dev);
1596
1597         return rc;
1598 }
1599 static DEVICE_ATTR_RO(mode);
1600
1601 static ssize_t force_raw_store(struct device *dev,
1602                 struct device_attribute *attr, const char *buf, size_t len)
1603 {
1604         bool force_raw;
1605         int rc = strtobool(buf, &force_raw);
1606
1607         if (rc)
1608                 return rc;
1609
1610         to_ndns(dev)->force_raw = force_raw;
1611         return len;
1612 }
1613
1614 static ssize_t force_raw_show(struct device *dev,
1615                 struct device_attribute *attr, char *buf)
1616 {
1617         return sprintf(buf, "%d\n", to_ndns(dev)->force_raw);
1618 }
1619 static DEVICE_ATTR_RW(force_raw);
1620
1621 static struct attribute *nd_namespace_attributes[] = {
1622         &dev_attr_nstype.attr,
1623         &dev_attr_size.attr,
1624         &dev_attr_mode.attr,
1625         &dev_attr_uuid.attr,
1626         &dev_attr_holder.attr,
1627         &dev_attr_resource.attr,
1628         &dev_attr_alt_name.attr,
1629         &dev_attr_force_raw.attr,
1630         &dev_attr_sector_size.attr,
1631         &dev_attr_dpa_extents.attr,
1632         &dev_attr_holder_class.attr,
1633         NULL,
1634 };
1635
1636 static umode_t namespace_visible(struct kobject *kobj,
1637                 struct attribute *a, int n)
1638 {
1639         struct device *dev = container_of(kobj, struct device, kobj);
1640
1641         if (a == &dev_attr_resource.attr) {
1642                 if (is_namespace_blk(dev))
1643                         return 0;
1644                 return 0400;
1645         }
1646
1647         if (is_namespace_pmem(dev) || is_namespace_blk(dev)) {
1648                 if (a == &dev_attr_size.attr)
1649                         return 0644;
1650
1651                 return a->mode;
1652         }
1653
1654         if (a == &dev_attr_nstype.attr || a == &dev_attr_size.attr
1655                         || a == &dev_attr_holder.attr
1656                         || a == &dev_attr_holder_class.attr
1657                         || a == &dev_attr_force_raw.attr
1658                         || a == &dev_attr_mode.attr)
1659                 return a->mode;
1660
1661         return 0;
1662 }
1663
1664 static struct attribute_group nd_namespace_attribute_group = {
1665         .attrs = nd_namespace_attributes,
1666         .is_visible = namespace_visible,
1667 };
1668
1669 static const struct attribute_group *nd_namespace_attribute_groups[] = {
1670         &nd_device_attribute_group,
1671         &nd_namespace_attribute_group,
1672         &nd_numa_attribute_group,
1673         NULL,
1674 };
1675
1676 struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev)
1677 {
1678         struct nd_btt *nd_btt = is_nd_btt(dev) ? to_nd_btt(dev) : NULL;
1679         struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL;
1680         struct nd_dax *nd_dax = is_nd_dax(dev) ? to_nd_dax(dev) : NULL;
1681         struct nd_namespace_common *ndns = NULL;
1682         resource_size_t size;
1683
1684         if (nd_btt || nd_pfn || nd_dax) {
1685                 if (nd_btt)
1686                         ndns = nd_btt->ndns;
1687                 else if (nd_pfn)
1688                         ndns = nd_pfn->ndns;
1689                 else if (nd_dax)
1690                         ndns = nd_dax->nd_pfn.ndns;
1691
1692                 if (!ndns)
1693                         return ERR_PTR(-ENODEV);
1694
1695                 /*
1696                  * Flush any in-progess probes / removals in the driver
1697                  * for the raw personality of this namespace.
1698                  */
1699                 device_lock(&ndns->dev);
1700                 device_unlock(&ndns->dev);
1701                 if (ndns->dev.driver) {
1702                         dev_dbg(&ndns->dev, "is active, can't bind %s\n",
1703                                         dev_name(dev));
1704                         return ERR_PTR(-EBUSY);
1705                 }
1706                 if (dev_WARN_ONCE(&ndns->dev, ndns->claim != dev,
1707                                         "host (%s) vs claim (%s) mismatch\n",
1708                                         dev_name(dev),
1709                                         dev_name(ndns->claim)))
1710                         return ERR_PTR(-ENXIO);
1711         } else {
1712                 ndns = to_ndns(dev);
1713                 if (ndns->claim) {
1714                         dev_dbg(dev, "claimed by %s, failing probe\n",
1715                                 dev_name(ndns->claim));
1716
1717                         return ERR_PTR(-ENXIO);
1718                 }
1719         }
1720
1721         if (nvdimm_namespace_locked(ndns))
1722                 return ERR_PTR(-EACCES);
1723
1724         size = nvdimm_namespace_capacity(ndns);
1725         if (size < ND_MIN_NAMESPACE_SIZE) {
1726                 dev_dbg(&ndns->dev, "%pa, too small must be at least %#x\n",
1727                                 &size, ND_MIN_NAMESPACE_SIZE);
1728                 return ERR_PTR(-ENODEV);
1729         }
1730
1731         if (is_namespace_pmem(&ndns->dev)) {
1732                 struct nd_namespace_pmem *nspm;
1733
1734                 nspm = to_nd_namespace_pmem(&ndns->dev);
1735                 if (uuid_not_set(nspm->uuid, &ndns->dev, __func__))
1736                         return ERR_PTR(-ENODEV);
1737         } else if (is_namespace_blk(&ndns->dev)) {
1738                 struct nd_namespace_blk *nsblk;
1739
1740                 nsblk = to_nd_namespace_blk(&ndns->dev);
1741                 if (uuid_not_set(nsblk->uuid, &ndns->dev, __func__))
1742                         return ERR_PTR(-ENODEV);
1743                 if (!nsblk->lbasize) {
1744                         dev_dbg(&ndns->dev, "sector size not set\n");
1745                         return ERR_PTR(-ENODEV);
1746                 }
1747                 if (!nd_namespace_blk_validate(nsblk))
1748                         return ERR_PTR(-ENODEV);
1749         }
1750
1751         return ndns;
1752 }
1753 EXPORT_SYMBOL(nvdimm_namespace_common_probe);
1754
1755 static struct device **create_namespace_io(struct nd_region *nd_region)
1756 {
1757         struct nd_namespace_io *nsio;
1758         struct device *dev, **devs;
1759         struct resource *res;
1760
1761         nsio = kzalloc(sizeof(*nsio), GFP_KERNEL);
1762         if (!nsio)
1763                 return NULL;
1764
1765         devs = kcalloc(2, sizeof(struct device *), GFP_KERNEL);
1766         if (!devs) {
1767                 kfree(nsio);
1768                 return NULL;
1769         }
1770
1771         dev = &nsio->common.dev;
1772         dev->type = &namespace_io_device_type;
1773         dev->parent = &nd_region->dev;
1774         res = &nsio->res;
1775         res->name = dev_name(&nd_region->dev);
1776         res->flags = IORESOURCE_MEM;
1777         res->start = nd_region->ndr_start;
1778         res->end = res->start + nd_region->ndr_size - 1;
1779
1780         devs[0] = dev;
1781         return devs;
1782 }
1783
1784 static bool has_uuid_at_pos(struct nd_region *nd_region, u8 *uuid,
1785                 u64 cookie, u16 pos)
1786 {
1787         struct nd_namespace_label *found = NULL;
1788         int i;
1789
1790         for (i = 0; i < nd_region->ndr_mappings; i++) {
1791                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1792                 struct nd_interleave_set *nd_set = nd_region->nd_set;
1793                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1794                 struct nd_label_ent *label_ent;
1795                 bool found_uuid = false;
1796
1797                 list_for_each_entry(label_ent, &nd_mapping->labels, list) {
1798                         struct nd_namespace_label *nd_label = label_ent->label;
1799                         u16 position, nlabel;
1800                         u64 isetcookie;
1801
1802                         if (!nd_label)
1803                                 continue;
1804                         isetcookie = __le64_to_cpu(nd_label->isetcookie);
1805                         position = __le16_to_cpu(nd_label->position);
1806                         nlabel = __le16_to_cpu(nd_label->nlabel);
1807
1808                         if (isetcookie != cookie)
1809                                 continue;
1810
1811                         if (memcmp(nd_label->uuid, uuid, NSLABEL_UUID_LEN) != 0)
1812                                 continue;
1813
1814                         if (namespace_label_has(ndd, type_guid)
1815                                         && !guid_equal(&nd_set->type_guid,
1816                                                 &nd_label->type_guid)) {
1817                                 dev_dbg(ndd->dev, "expect type_guid %pUb got %pUb\n",
1818                                                 nd_set->type_guid.b,
1819                                                 nd_label->type_guid.b);
1820                                 continue;
1821                         }
1822
1823                         if (found_uuid) {
1824                                 dev_dbg(ndd->dev, "duplicate entry for uuid\n");
1825                                 return false;
1826                         }
1827                         found_uuid = true;
1828                         if (nlabel != nd_region->ndr_mappings)
1829                                 continue;
1830                         if (position != pos)
1831                                 continue;
1832                         found = nd_label;
1833                         break;
1834                 }
1835                 if (found)
1836                         break;
1837         }
1838         return found != NULL;
1839 }
1840
1841 static int select_pmem_id(struct nd_region *nd_region, u8 *pmem_id)
1842 {
1843         int i;
1844
1845         if (!pmem_id)
1846                 return -ENODEV;
1847
1848         for (i = 0; i < nd_region->ndr_mappings; i++) {
1849                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1850                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1851                 struct nd_namespace_label *nd_label = NULL;
1852                 u64 hw_start, hw_end, pmem_start, pmem_end;
1853                 struct nd_label_ent *label_ent;
1854
1855                 lockdep_assert_held(&nd_mapping->lock);
1856                 list_for_each_entry(label_ent, &nd_mapping->labels, list) {
1857                         nd_label = label_ent->label;
1858                         if (!nd_label)
1859                                 continue;
1860                         if (memcmp(nd_label->uuid, pmem_id, NSLABEL_UUID_LEN) == 0)
1861                                 break;
1862                         nd_label = NULL;
1863                 }
1864
1865                 if (!nd_label) {
1866                         WARN_ON(1);
1867                         return -EINVAL;
1868                 }
1869
1870                 /*
1871                  * Check that this label is compliant with the dpa
1872                  * range published in NFIT
1873                  */
1874                 hw_start = nd_mapping->start;
1875                 hw_end = hw_start + nd_mapping->size;
1876                 pmem_start = __le64_to_cpu(nd_label->dpa);
1877                 pmem_end = pmem_start + __le64_to_cpu(nd_label->rawsize);
1878                 if (pmem_start >= hw_start && pmem_start < hw_end
1879                                 && pmem_end <= hw_end && pmem_end > hw_start)
1880                         /* pass */;
1881                 else {
1882                         dev_dbg(&nd_region->dev, "%s invalid label for %pUb\n",
1883                                         dev_name(ndd->dev), nd_label->uuid);
1884                         return -EINVAL;
1885                 }
1886
1887                 /* move recently validated label to the front of the list */
1888                 list_move(&label_ent->list, &nd_mapping->labels);
1889         }
1890         return 0;
1891 }
1892
1893 /**
1894  * create_namespace_pmem - validate interleave set labelling, retrieve label0
1895  * @nd_region: region with mappings to validate
1896  * @nspm: target namespace to create
1897  * @nd_label: target pmem namespace label to evaluate
1898  */
1899 static struct device *create_namespace_pmem(struct nd_region *nd_region,
1900                 struct nd_namespace_index *nsindex,
1901                 struct nd_namespace_label *nd_label)
1902 {
1903         u64 cookie = nd_region_interleave_set_cookie(nd_region, nsindex);
1904         u64 altcookie = nd_region_interleave_set_altcookie(nd_region);
1905         struct nd_label_ent *label_ent;
1906         struct nd_namespace_pmem *nspm;
1907         struct nd_mapping *nd_mapping;
1908         resource_size_t size = 0;
1909         struct resource *res;
1910         struct device *dev;
1911         int rc = 0;
1912         u16 i;
1913
1914         if (cookie == 0) {
1915                 dev_dbg(&nd_region->dev, "invalid interleave-set-cookie\n");
1916                 return ERR_PTR(-ENXIO);
1917         }
1918
1919         if (__le64_to_cpu(nd_label->isetcookie) != cookie) {
1920                 dev_dbg(&nd_region->dev, "invalid cookie in label: %pUb\n",
1921                                 nd_label->uuid);
1922                 if (__le64_to_cpu(nd_label->isetcookie) != altcookie)
1923                         return ERR_PTR(-EAGAIN);
1924
1925                 dev_dbg(&nd_region->dev, "valid altcookie in label: %pUb\n",
1926                                 nd_label->uuid);
1927         }
1928
1929         nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
1930         if (!nspm)
1931                 return ERR_PTR(-ENOMEM);
1932
1933         nspm->id = -1;
1934         dev = &nspm->nsio.common.dev;
1935         dev->type = &namespace_pmem_device_type;
1936         dev->parent = &nd_region->dev;
1937         res = &nspm->nsio.res;
1938         res->name = dev_name(&nd_region->dev);
1939         res->flags = IORESOURCE_MEM;
1940
1941         for (i = 0; i < nd_region->ndr_mappings; i++) {
1942                 if (has_uuid_at_pos(nd_region, nd_label->uuid, cookie, i))
1943                         continue;
1944                 if (has_uuid_at_pos(nd_region, nd_label->uuid, altcookie, i))
1945                         continue;
1946                 break;
1947         }
1948
1949         if (i < nd_region->ndr_mappings) {
1950                 struct nvdimm *nvdimm = nd_region->mapping[i].nvdimm;
1951
1952                 /*
1953                  * Give up if we don't find an instance of a uuid at each
1954                  * position (from 0 to nd_region->ndr_mappings - 1), or if we
1955                  * find a dimm with two instances of the same uuid.
1956                  */
1957                 dev_err(&nd_region->dev, "%s missing label for %pUb\n",
1958                                 nvdimm_name(nvdimm), nd_label->uuid);
1959                 rc = -EINVAL;
1960                 goto err;
1961         }
1962
1963         /*
1964          * Fix up each mapping's 'labels' to have the validated pmem label for
1965          * that position at labels[0], and NULL at labels[1].  In the process,
1966          * check that the namespace aligns with interleave-set.  We know
1967          * that it does not overlap with any blk namespaces by virtue of
1968          * the dimm being enabled (i.e. nd_label_reserve_dpa()
1969          * succeeded).
1970          */
1971         rc = select_pmem_id(nd_region, nd_label->uuid);
1972         if (rc)
1973                 goto err;
1974
1975         /* Calculate total size and populate namespace properties from label0 */
1976         for (i = 0; i < nd_region->ndr_mappings; i++) {
1977                 struct nd_namespace_label *label0;
1978                 struct nvdimm_drvdata *ndd;
1979
1980                 nd_mapping = &nd_region->mapping[i];
1981                 label_ent = list_first_entry_or_null(&nd_mapping->labels,
1982                                 typeof(*label_ent), list);
1983                 label0 = label_ent ? label_ent->label : 0;
1984
1985                 if (!label0) {
1986                         WARN_ON(1);
1987                         continue;
1988                 }
1989
1990                 size += __le64_to_cpu(label0->rawsize);
1991                 if (__le16_to_cpu(label0->position) != 0)
1992                         continue;
1993                 WARN_ON(nspm->alt_name || nspm->uuid);
1994                 nspm->alt_name = kmemdup((void __force *) label0->name,
1995                                 NSLABEL_NAME_LEN, GFP_KERNEL);
1996                 nspm->uuid = kmemdup((void __force *) label0->uuid,
1997                                 NSLABEL_UUID_LEN, GFP_KERNEL);
1998                 nspm->lbasize = __le64_to_cpu(label0->lbasize);
1999                 ndd = to_ndd(nd_mapping);
2000                 if (namespace_label_has(ndd, abstraction_guid))
2001                         nspm->nsio.common.claim_class
2002                                 = to_nvdimm_cclass(&label0->abstraction_guid);
2003
2004         }
2005
2006         if (!nspm->alt_name || !nspm->uuid) {
2007                 rc = -ENOMEM;
2008                 goto err;
2009         }
2010
2011         nd_namespace_pmem_set_resource(nd_region, nspm, size);
2012
2013         return dev;
2014  err:
2015         namespace_pmem_release(dev);
2016         switch (rc) {
2017         case -EINVAL:
2018                 dev_dbg(&nd_region->dev, "invalid label(s)\n");
2019                 break;
2020         case -ENODEV:
2021                 dev_dbg(&nd_region->dev, "label not found\n");
2022                 break;
2023         default:
2024                 dev_dbg(&nd_region->dev, "unexpected err: %d\n", rc);
2025                 break;
2026         }
2027         return ERR_PTR(rc);
2028 }
2029
2030 struct resource *nsblk_add_resource(struct nd_region *nd_region,
2031                 struct nvdimm_drvdata *ndd, struct nd_namespace_blk *nsblk,
2032                 resource_size_t start)
2033 {
2034         struct nd_label_id label_id;
2035         struct resource *res;
2036
2037         nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
2038         res = krealloc(nsblk->res,
2039                         sizeof(void *) * (nsblk->num_resources + 1),
2040                         GFP_KERNEL);
2041         if (!res)
2042                 return NULL;
2043         nsblk->res = (struct resource **) res;
2044         for_each_dpa_resource(ndd, res)
2045                 if (strcmp(res->name, label_id.id) == 0
2046                                 && res->start == start) {
2047                         nsblk->res[nsblk->num_resources++] = res;
2048                         return res;
2049                 }
2050         return NULL;
2051 }
2052
2053 static struct device *nd_namespace_blk_create(struct nd_region *nd_region)
2054 {
2055         struct nd_namespace_blk *nsblk;
2056         struct device *dev;
2057
2058         if (!is_nd_blk(&nd_region->dev))
2059                 return NULL;
2060
2061         nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
2062         if (!nsblk)
2063                 return NULL;
2064
2065         dev = &nsblk->common.dev;
2066         dev->type = &namespace_blk_device_type;
2067         nsblk->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL);
2068         if (nsblk->id < 0) {
2069                 kfree(nsblk);
2070                 return NULL;
2071         }
2072         dev_set_name(dev, "namespace%d.%d", nd_region->id, nsblk->id);
2073         dev->parent = &nd_region->dev;
2074         dev->groups = nd_namespace_attribute_groups;
2075
2076         return &nsblk->common.dev;
2077 }
2078
2079 static struct device *nd_namespace_pmem_create(struct nd_region *nd_region)
2080 {
2081         struct nd_namespace_pmem *nspm;
2082         struct resource *res;
2083         struct device *dev;
2084
2085         if (!is_memory(&nd_region->dev))
2086                 return NULL;
2087
2088         nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
2089         if (!nspm)
2090                 return NULL;
2091
2092         dev = &nspm->nsio.common.dev;
2093         dev->type = &namespace_pmem_device_type;
2094         dev->parent = &nd_region->dev;
2095         res = &nspm->nsio.res;
2096         res->name = dev_name(&nd_region->dev);
2097         res->flags = IORESOURCE_MEM;
2098
2099         nspm->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL);
2100         if (nspm->id < 0) {
2101                 kfree(nspm);
2102                 return NULL;
2103         }
2104         dev_set_name(dev, "namespace%d.%d", nd_region->id, nspm->id);
2105         dev->groups = nd_namespace_attribute_groups;
2106         nd_namespace_pmem_set_resource(nd_region, nspm, 0);
2107
2108         return dev;
2109 }
2110
2111 void nd_region_create_ns_seed(struct nd_region *nd_region)
2112 {
2113         WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2114
2115         if (nd_region_to_nstype(nd_region) == ND_DEVICE_NAMESPACE_IO)
2116                 return;
2117
2118         if (is_nd_blk(&nd_region->dev))
2119                 nd_region->ns_seed = nd_namespace_blk_create(nd_region);
2120         else
2121                 nd_region->ns_seed = nd_namespace_pmem_create(nd_region);
2122
2123         /*
2124          * Seed creation failures are not fatal, provisioning is simply
2125          * disabled until memory becomes available
2126          */
2127         if (!nd_region->ns_seed)
2128                 dev_err(&nd_region->dev, "failed to create %s namespace\n",
2129                                 is_nd_blk(&nd_region->dev) ? "blk" : "pmem");
2130         else
2131                 nd_device_register(nd_region->ns_seed);
2132 }
2133
2134 void nd_region_create_dax_seed(struct nd_region *nd_region)
2135 {
2136         WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2137         nd_region->dax_seed = nd_dax_create(nd_region);
2138         /*
2139          * Seed creation failures are not fatal, provisioning is simply
2140          * disabled until memory becomes available
2141          */
2142         if (!nd_region->dax_seed)
2143                 dev_err(&nd_region->dev, "failed to create dax namespace\n");
2144 }
2145
2146 void nd_region_create_pfn_seed(struct nd_region *nd_region)
2147 {
2148         WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2149         nd_region->pfn_seed = nd_pfn_create(nd_region);
2150         /*
2151          * Seed creation failures are not fatal, provisioning is simply
2152          * disabled until memory becomes available
2153          */
2154         if (!nd_region->pfn_seed)
2155                 dev_err(&nd_region->dev, "failed to create pfn namespace\n");
2156 }
2157
2158 void nd_region_create_btt_seed(struct nd_region *nd_region)
2159 {
2160         WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2161         nd_region->btt_seed = nd_btt_create(nd_region);
2162         /*
2163          * Seed creation failures are not fatal, provisioning is simply
2164          * disabled until memory becomes available
2165          */
2166         if (!nd_region->btt_seed)
2167                 dev_err(&nd_region->dev, "failed to create btt namespace\n");
2168 }
2169
2170 static int add_namespace_resource(struct nd_region *nd_region,
2171                 struct nd_namespace_label *nd_label, struct device **devs,
2172                 int count)
2173 {
2174         struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2175         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2176         int i;
2177
2178         for (i = 0; i < count; i++) {
2179                 u8 *uuid = namespace_to_uuid(devs[i]);
2180                 struct resource *res;
2181
2182                 if (IS_ERR_OR_NULL(uuid)) {
2183                         WARN_ON(1);
2184                         continue;
2185                 }
2186
2187                 if (memcmp(uuid, nd_label->uuid, NSLABEL_UUID_LEN) != 0)
2188                         continue;
2189                 if (is_namespace_blk(devs[i])) {
2190                         res = nsblk_add_resource(nd_region, ndd,
2191                                         to_nd_namespace_blk(devs[i]),
2192                                         __le64_to_cpu(nd_label->dpa));
2193                         if (!res)
2194                                 return -ENXIO;
2195                         nd_dbg_dpa(nd_region, ndd, res, "%d assign\n", count);
2196                 } else {
2197                         dev_err(&nd_region->dev,
2198                                         "error: conflicting extents for uuid: %pUb\n",
2199                                         nd_label->uuid);
2200                         return -ENXIO;
2201                 }
2202                 break;
2203         }
2204
2205         return i;
2206 }
2207
2208 static struct device *create_namespace_blk(struct nd_region *nd_region,
2209                 struct nd_namespace_label *nd_label, int count)
2210 {
2211
2212         struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2213         struct nd_interleave_set *nd_set = nd_region->nd_set;
2214         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2215         struct nd_namespace_blk *nsblk;
2216         char name[NSLABEL_NAME_LEN];
2217         struct device *dev = NULL;
2218         struct resource *res;
2219
2220         if (namespace_label_has(ndd, type_guid)) {
2221                 if (!guid_equal(&nd_set->type_guid, &nd_label->type_guid)) {
2222                         dev_dbg(ndd->dev, "expect type_guid %pUb got %pUb\n",
2223                                         nd_set->type_guid.b,
2224                                         nd_label->type_guid.b);
2225                         return ERR_PTR(-EAGAIN);
2226                 }
2227
2228                 if (nd_label->isetcookie != __cpu_to_le64(nd_set->cookie2)) {
2229                         dev_dbg(ndd->dev, "expect cookie %#llx got %#llx\n",
2230                                         nd_set->cookie2,
2231                                         __le64_to_cpu(nd_label->isetcookie));
2232                         return ERR_PTR(-EAGAIN);
2233                 }
2234         }
2235
2236         nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
2237         if (!nsblk)
2238                 return ERR_PTR(-ENOMEM);
2239         dev = &nsblk->common.dev;
2240         dev->type = &namespace_blk_device_type;
2241         dev->parent = &nd_region->dev;
2242         nsblk->id = -1;
2243         nsblk->lbasize = __le64_to_cpu(nd_label->lbasize);
2244         nsblk->uuid = kmemdup(nd_label->uuid, NSLABEL_UUID_LEN,
2245                         GFP_KERNEL);
2246         if (namespace_label_has(ndd, abstraction_guid))
2247                 nsblk->common.claim_class
2248                         = to_nvdimm_cclass(&nd_label->abstraction_guid);
2249         if (!nsblk->uuid)
2250                 goto blk_err;
2251         memcpy(name, nd_label->name, NSLABEL_NAME_LEN);
2252         if (name[0]) {
2253                 nsblk->alt_name = kmemdup(name, NSLABEL_NAME_LEN,
2254                                 GFP_KERNEL);
2255                 if (!nsblk->alt_name)
2256                         goto blk_err;
2257         }
2258         res = nsblk_add_resource(nd_region, ndd, nsblk,
2259                         __le64_to_cpu(nd_label->dpa));
2260         if (!res)
2261                 goto blk_err;
2262         nd_dbg_dpa(nd_region, ndd, res, "%d: assign\n", count);
2263         return dev;
2264  blk_err:
2265         namespace_blk_release(dev);
2266         return ERR_PTR(-ENXIO);
2267 }
2268
2269 static int cmp_dpa(const void *a, const void *b)
2270 {
2271         const struct device *dev_a = *(const struct device **) a;
2272         const struct device *dev_b = *(const struct device **) b;
2273         struct nd_namespace_blk *nsblk_a, *nsblk_b;
2274         struct nd_namespace_pmem *nspm_a, *nspm_b;
2275
2276         if (is_namespace_io(dev_a))
2277                 return 0;
2278
2279         if (is_namespace_blk(dev_a)) {
2280                 nsblk_a = to_nd_namespace_blk(dev_a);
2281                 nsblk_b = to_nd_namespace_blk(dev_b);
2282
2283                 return memcmp(&nsblk_a->res[0]->start, &nsblk_b->res[0]->start,
2284                                 sizeof(resource_size_t));
2285         }
2286
2287         nspm_a = to_nd_namespace_pmem(dev_a);
2288         nspm_b = to_nd_namespace_pmem(dev_b);
2289
2290         return memcmp(&nspm_a->nsio.res.start, &nspm_b->nsio.res.start,
2291                         sizeof(resource_size_t));
2292 }
2293
2294 static struct device **scan_labels(struct nd_region *nd_region)
2295 {
2296         int i, count = 0;
2297         struct device *dev, **devs = NULL;
2298         struct nd_label_ent *label_ent, *e;
2299         struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2300         resource_size_t map_end = nd_mapping->start + nd_mapping->size - 1;
2301
2302         /* "safe" because create_namespace_pmem() might list_move() label_ent */
2303         list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) {
2304                 struct nd_namespace_label *nd_label = label_ent->label;
2305                 struct device **__devs;
2306                 u32 flags;
2307
2308                 if (!nd_label)
2309                         continue;
2310                 flags = __le32_to_cpu(nd_label->flags);
2311                 if (is_nd_blk(&nd_region->dev)
2312                                 == !!(flags & NSLABEL_FLAG_LOCAL))
2313                         /* pass, region matches label type */;
2314                 else
2315                         continue;
2316
2317                 /* skip labels that describe extents outside of the region */
2318                 if (nd_label->dpa < nd_mapping->start || nd_label->dpa > map_end)
2319                         continue;
2320
2321                 i = add_namespace_resource(nd_region, nd_label, devs, count);
2322                 if (i < 0)
2323                         goto err;
2324                 if (i < count)
2325                         continue;
2326                 __devs = kcalloc(count + 2, sizeof(dev), GFP_KERNEL);
2327                 if (!__devs)
2328                         goto err;
2329                 memcpy(__devs, devs, sizeof(dev) * count);
2330                 kfree(devs);
2331                 devs = __devs;
2332
2333                 if (is_nd_blk(&nd_region->dev))
2334                         dev = create_namespace_blk(nd_region, nd_label, count);
2335                 else {
2336                         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2337                         struct nd_namespace_index *nsindex;
2338
2339                         nsindex = to_namespace_index(ndd, ndd->ns_current);
2340                         dev = create_namespace_pmem(nd_region, nsindex, nd_label);
2341                 }
2342
2343                 if (IS_ERR(dev)) {
2344                         switch (PTR_ERR(dev)) {
2345                         case -EAGAIN:
2346                                 /* skip invalid labels */
2347                                 continue;
2348                         case -ENODEV:
2349                                 /* fallthrough to seed creation */
2350                                 break;
2351                         default:
2352                                 goto err;
2353                         }
2354                 } else
2355                         devs[count++] = dev;
2356
2357         }
2358
2359         dev_dbg(&nd_region->dev, "discovered %d %s namespace%s\n",
2360                         count, is_nd_blk(&nd_region->dev)
2361                         ? "blk" : "pmem", count == 1 ? "" : "s");
2362
2363         if (count == 0) {
2364                 /* Publish a zero-sized namespace for userspace to configure. */
2365                 nd_mapping_free_labels(nd_mapping);
2366
2367                 devs = kcalloc(2, sizeof(dev), GFP_KERNEL);
2368                 if (!devs)
2369                         goto err;
2370                 if (is_nd_blk(&nd_region->dev)) {
2371                         struct nd_namespace_blk *nsblk;
2372
2373                         nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
2374                         if (!nsblk)
2375                                 goto err;
2376                         dev = &nsblk->common.dev;
2377                         dev->type = &namespace_blk_device_type;
2378                 } else {
2379                         struct nd_namespace_pmem *nspm;
2380
2381                         nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
2382                         if (!nspm)
2383                                 goto err;
2384                         dev = &nspm->nsio.common.dev;
2385                         dev->type = &namespace_pmem_device_type;
2386                         nd_namespace_pmem_set_resource(nd_region, nspm, 0);
2387                 }
2388                 dev->parent = &nd_region->dev;
2389                 devs[count++] = dev;
2390         } else if (is_memory(&nd_region->dev)) {
2391                 /* clean unselected labels */
2392                 for (i = 0; i < nd_region->ndr_mappings; i++) {
2393                         struct list_head *l, *e;
2394                         LIST_HEAD(list);
2395                         int j;
2396
2397                         nd_mapping = &nd_region->mapping[i];
2398                         if (list_empty(&nd_mapping->labels)) {
2399                                 WARN_ON(1);
2400                                 continue;
2401                         }
2402
2403                         j = count;
2404                         list_for_each_safe(l, e, &nd_mapping->labels) {
2405                                 if (!j--)
2406                                         break;
2407                                 list_move_tail(l, &list);
2408                         }
2409                         nd_mapping_free_labels(nd_mapping);
2410                         list_splice_init(&list, &nd_mapping->labels);
2411                 }
2412         }
2413
2414         if (count > 1)
2415                 sort(devs, count, sizeof(struct device *), cmp_dpa, NULL);
2416
2417         return devs;
2418
2419  err:
2420         if (devs) {
2421                 for (i = 0; devs[i]; i++)
2422                         if (is_nd_blk(&nd_region->dev))
2423                                 namespace_blk_release(devs[i]);
2424                         else
2425                                 namespace_pmem_release(devs[i]);
2426                 kfree(devs);
2427         }
2428         return NULL;
2429 }
2430
2431 static struct device **create_namespaces(struct nd_region *nd_region)
2432 {
2433         struct nd_mapping *nd_mapping;
2434         struct device **devs;
2435         int i;
2436
2437         if (nd_region->ndr_mappings == 0)
2438                 return NULL;
2439
2440         /* lock down all mappings while we scan labels */
2441         for (i = 0; i < nd_region->ndr_mappings; i++) {
2442                 nd_mapping = &nd_region->mapping[i];
2443                 mutex_lock_nested(&nd_mapping->lock, i);
2444         }
2445
2446         devs = scan_labels(nd_region);
2447
2448         for (i = 0; i < nd_region->ndr_mappings; i++) {
2449                 int reverse = nd_region->ndr_mappings - 1 - i;
2450
2451                 nd_mapping = &nd_region->mapping[reverse];
2452                 mutex_unlock(&nd_mapping->lock);
2453         }
2454
2455         return devs;
2456 }
2457
2458 static int init_active_labels(struct nd_region *nd_region)
2459 {
2460         int i;
2461
2462         for (i = 0; i < nd_region->ndr_mappings; i++) {
2463                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
2464                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2465                 struct nvdimm *nvdimm = nd_mapping->nvdimm;
2466                 struct nd_label_ent *label_ent;
2467                 int count, j;
2468
2469                 /*
2470                  * If the dimm is disabled then we may need to prevent
2471                  * the region from being activated.
2472                  */
2473                 if (!ndd) {
2474                         if (test_bit(NDD_LOCKED, &nvdimm->flags))
2475                                 /* fail, label data may be unreadable */;
2476                         else if (test_bit(NDD_ALIASING, &nvdimm->flags))
2477                                 /* fail, labels needed to disambiguate dpa */;
2478                         else
2479                                 return 0;
2480
2481                         dev_err(&nd_region->dev, "%s: is %s, failing probe\n",
2482                                         dev_name(&nd_mapping->nvdimm->dev),
2483                                         test_bit(NDD_LOCKED, &nvdimm->flags)
2484                                         ? "locked" : "disabled");
2485                         return -ENXIO;
2486                 }
2487                 nd_mapping->ndd = ndd;
2488                 atomic_inc(&nvdimm->busy);
2489                 get_ndd(ndd);
2490
2491                 count = nd_label_active_count(ndd);
2492                 dev_dbg(ndd->dev, "count: %d\n", count);
2493                 if (!count)
2494                         continue;
2495                 for (j = 0; j < count; j++) {
2496                         struct nd_namespace_label *label;
2497
2498                         label_ent = kzalloc(sizeof(*label_ent), GFP_KERNEL);
2499                         if (!label_ent)
2500                                 break;
2501                         label = nd_label_active(ndd, j);
2502                         if (test_bit(NDD_NOBLK, &nvdimm->flags)) {
2503                                 u32 flags = __le32_to_cpu(label->flags);
2504
2505                                 flags &= ~NSLABEL_FLAG_LOCAL;
2506                                 label->flags = __cpu_to_le32(flags);
2507                         }
2508                         label_ent->label = label;
2509
2510                         mutex_lock(&nd_mapping->lock);
2511                         list_add_tail(&label_ent->list, &nd_mapping->labels);
2512                         mutex_unlock(&nd_mapping->lock);
2513                 }
2514
2515                 if (j >= count)
2516                         continue;
2517
2518                 mutex_lock(&nd_mapping->lock);
2519                 nd_mapping_free_labels(nd_mapping);
2520                 mutex_unlock(&nd_mapping->lock);
2521                 return -ENOMEM;
2522         }
2523
2524         return 0;
2525 }
2526
2527 int nd_region_register_namespaces(struct nd_region *nd_region, int *err)
2528 {
2529         struct device **devs = NULL;
2530         int i, rc = 0, type;
2531
2532         *err = 0;
2533         nvdimm_bus_lock(&nd_region->dev);
2534         rc = init_active_labels(nd_region);
2535         if (rc) {
2536                 nvdimm_bus_unlock(&nd_region->dev);
2537                 return rc;
2538         }
2539
2540         type = nd_region_to_nstype(nd_region);
2541         switch (type) {
2542         case ND_DEVICE_NAMESPACE_IO:
2543                 devs = create_namespace_io(nd_region);
2544                 break;
2545         case ND_DEVICE_NAMESPACE_PMEM:
2546         case ND_DEVICE_NAMESPACE_BLK:
2547                 devs = create_namespaces(nd_region);
2548                 break;
2549         default:
2550                 break;
2551         }
2552         nvdimm_bus_unlock(&nd_region->dev);
2553
2554         if (!devs)
2555                 return -ENODEV;
2556
2557         for (i = 0; devs[i]; i++) {
2558                 struct device *dev = devs[i];
2559                 int id;
2560
2561                 if (type == ND_DEVICE_NAMESPACE_BLK) {
2562                         struct nd_namespace_blk *nsblk;
2563
2564                         nsblk = to_nd_namespace_blk(dev);
2565                         id = ida_simple_get(&nd_region->ns_ida, 0, 0,
2566                                         GFP_KERNEL);
2567                         nsblk->id = id;
2568                 } else if (type == ND_DEVICE_NAMESPACE_PMEM) {
2569                         struct nd_namespace_pmem *nspm;
2570
2571                         nspm = to_nd_namespace_pmem(dev);
2572                         id = ida_simple_get(&nd_region->ns_ida, 0, 0,
2573                                         GFP_KERNEL);
2574                         nspm->id = id;
2575                 } else
2576                         id = i;
2577
2578                 if (id < 0)
2579                         break;
2580                 dev_set_name(dev, "namespace%d.%d", nd_region->id, id);
2581                 dev->groups = nd_namespace_attribute_groups;
2582                 nd_device_register(dev);
2583         }
2584         if (i)
2585                 nd_region->ns_seed = devs[0];
2586
2587         if (devs[i]) {
2588                 int j;
2589
2590                 for (j = i; devs[j]; j++) {
2591                         struct device *dev = devs[j];
2592
2593                         device_initialize(dev);
2594                         put_device(dev);
2595                 }
2596                 *err = j - i;
2597                 /*
2598                  * All of the namespaces we tried to register failed, so
2599                  * fail region activation.
2600                  */
2601                 if (*err == 0)
2602                         rc = -ENODEV;
2603         }
2604         kfree(devs);
2605
2606         if (rc == -ENODEV)
2607                 return rc;
2608
2609         return i;
2610 }