drivers/nvdimm/namespace_devs.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
   4  */
   5 #include <linux/module.h>
   6 #include <linux/device.h>
   7 #include <linux/sort.h>
   8 #include <linux/slab.h>
   9 #include <linux/list.h>
  10 #include <linux/nd.h>
  11 #include "nd-core.h"
  12 #include "pmem.h"
  13 #include "pfn.h"
  14 #include "nd.h"
  15
  16 static void namespace_io_release(struct device *dev)
  17 {
  18         struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
  19
  20         kfree(nsio);
  21 }
  22
  23 static void namespace_pmem_release(struct device *dev)
  24 {
  25         struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
  26         struct nd_region *nd_region = to_nd_region(dev->parent);
  27
  28         if (nspm->id >= 0)
  29                 ida_simple_remove(&nd_region->ns_ida, nspm->id);
  30         kfree(nspm->alt_name);
  31         kfree(nspm->uuid);
  32         kfree(nspm);
  33 }
  34
  35 static void namespace_blk_release(struct device *dev)
  36 {
  37         struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
  38         struct nd_region *nd_region = to_nd_region(dev->parent);
  39
  40         if (nsblk->id >= 0)
  41                 ida_simple_remove(&nd_region->ns_ida, nsblk->id);
  42         kfree(nsblk->alt_name);
  43         kfree(nsblk->uuid);
  44         kfree(nsblk->res);
  45         kfree(nsblk);
  46 }
  47
  48 static bool is_namespace_pmem(const struct device *dev);
  49 static bool is_namespace_blk(const struct device *dev);
  50 static bool is_namespace_io(const struct device *dev);
  51
  52 static int is_uuid_busy(struct device *dev, void *data)
  53 {
  54         u8 *uuid1 = data, *uuid2 = NULL;
  55
  56         if (is_namespace_pmem(dev)) {
  57                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
  58
  59                 uuid2 = nspm->uuid;
  60         } else if (is_namespace_blk(dev)) {
  61                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
  62
  63                 uuid2 = nsblk->uuid;
  64         } else if (is_nd_btt(dev)) {
  65                 struct nd_btt *nd_btt = to_nd_btt(dev);
  66
  67                 uuid2 = nd_btt->uuid;
  68         } else if (is_nd_pfn(dev)) {
  69                 struct nd_pfn *nd_pfn = to_nd_pfn(dev);
  70
  71                 uuid2 = nd_pfn->uuid;
  72         }
  73
  74         if (uuid2 && memcmp(uuid1, uuid2, NSLABEL_UUID_LEN) == 0)
  75                 return -EBUSY;
  76
  77         return 0;
  78 }
  79
  80 static int is_namespace_uuid_busy(struct device *dev, void *data)
  81 {
  82         if (is_nd_region(dev))
  83                 return device_for_each_child(dev, data, is_uuid_busy);
  84         return 0;
  85 }
  86
  87 /**
  88  * nd_is_uuid_unique - verify that no other namespace has @uuid
  89  * @dev: any device on a nvdimm_bus
  90  * @uuid: uuid to check
  91  */
  92 bool nd_is_uuid_unique(struct device *dev, u8 *uuid)
  93 {
  94         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
  95
  96         if (!nvdimm_bus)
  97                 return false;
  98         WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm_bus->dev));
  99         if (device_for_each_child(&nvdimm_bus->dev, uuid,
 100                                 is_namespace_uuid_busy) != 0)
 101                 return false;
 102         return true;
 103 }
 104
 105 bool pmem_should_map_pages(struct device *dev)
 106 {
 107         struct nd_region *nd_region = to_nd_region(dev->parent);
 108         struct nd_namespace_common *ndns = to_ndns(dev);
 109         struct nd_namespace_io *nsio;
 110
 111         if (!IS_ENABLED(CONFIG_ZONE_DEVICE))
 112                 return false;
 113
 114         if (!test_bit(ND_REGION_PAGEMAP, &nd_region->flags))
 115                 return false;
 116
 117         if (is_nd_pfn(dev) || is_nd_btt(dev))
 118                 return false;
 119
 120         if (ndns->force_raw)
 121                 return false;
 122
 123         nsio = to_nd_namespace_io(dev);
 124         if (region_intersects(nsio->res.start, resource_size(&nsio->res),
 125                                 IORESOURCE_SYSTEM_RAM,
 126                                 IORES_DESC_NONE) == REGION_MIXED)
 127                 return false;
 128
 129         return ARCH_MEMREMAP_PMEM == MEMREMAP_WB;
 130 }
 131 EXPORT_SYMBOL(pmem_should_map_pages);
 132
 133 unsigned int pmem_sector_size(struct nd_namespace_common *ndns)
 134 {
 135         if (is_namespace_pmem(&ndns->dev)) {
 136                 struct nd_namespace_pmem *nspm;
 137
 138                 nspm = to_nd_namespace_pmem(&ndns->dev);
 139                 if (nspm->lbasize == 0 || nspm->lbasize == 512)
 140                         /* default */;
 141                 else if (nspm->lbasize == 4096)
 142                         return 4096;
 143                 else
 144                         dev_WARN(&ndns->dev, "unsupported sector size: %ld\n",
 145                                         nspm->lbasize);
 146         }
 147
 148         /*
 149          * There is no namespace label (is_namespace_io()), or the label
 150          * indicates the default sector size.
 151          */
 152         return 512;
 153 }
 154 EXPORT_SYMBOL(pmem_sector_size);
 155
 156 const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
 157                 char *name)
 158 {
 159         struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
 160         const char *suffix = NULL;
 161
 162         if (ndns->claim && is_nd_btt(ndns->claim))
 163                 suffix = "s";
 164
 165         if (is_namespace_pmem(&ndns->dev) || is_namespace_io(&ndns->dev)) {
 166                 int nsidx = 0;
 167
 168                 if (is_namespace_pmem(&ndns->dev)) {
 169                         struct nd_namespace_pmem *nspm;
 170
 171                         nspm = to_nd_namespace_pmem(&ndns->dev);
 172                         nsidx = nspm->id;
 173                 }
 174
 175                 if (nsidx)
 176                         sprintf(name, "pmem%d.%d%s", nd_region->id, nsidx,
 177                                         suffix ? suffix : "");
 178                 else
 179                         sprintf(name, "pmem%d%s", nd_region->id,
 180                                         suffix ? suffix : "");
 181         } else if (is_namespace_blk(&ndns->dev)) {
 182                 struct nd_namespace_blk *nsblk;
 183
 184                 nsblk = to_nd_namespace_blk(&ndns->dev);
 185                 sprintf(name, "ndblk%d.%d%s", nd_region->id, nsblk->id,
 186                                 suffix ? suffix : "");
 187         } else {
 188                 return NULL;
 189         }
 190
 191         return name;
 192 }
 193 EXPORT_SYMBOL(nvdimm_namespace_disk_name);
 194
 195 const u8 *nd_dev_to_uuid(struct device *dev)
 196 {
 197         static const u8 null_uuid[16];
 198
 199         if (!dev)
 200                 return null_uuid;
 201
 202         if (is_namespace_pmem(dev)) {
 203                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
 204
 205                 return nspm->uuid;
 206         } else if (is_namespace_blk(dev)) {
 207                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 208
 209                 return nsblk->uuid;
 210         } else
 211                 return null_uuid;
 212 }
 213 EXPORT_SYMBOL(nd_dev_to_uuid);
 214
 215 static ssize_t nstype_show(struct device *dev,
 216                 struct device_attribute *attr, char *buf)
 217 {
 218         struct nd_region *nd_region = to_nd_region(dev->parent);
 219
 220         return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region));
 221 }
 222 static DEVICE_ATTR_RO(nstype);
 223
 224 static ssize_t __alt_name_store(struct device *dev, const char *buf,
 225                 const size_t len)
 226 {
 227         char *input, *pos, *alt_name, **ns_altname;
 228         ssize_t rc;
 229
 230         if (is_namespace_pmem(dev)) {
 231                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
 232
 233                 ns_altname = &nspm->alt_name;
 234         } else if (is_namespace_blk(dev)) {
 235                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 236
 237                 ns_altname = &nsblk->alt_name;
 238         } else
 239                 return -ENXIO;
 240
 241         if (dev->driver || to_ndns(dev)->claim)
 242                 return -EBUSY;
 243
 244         input = kstrndup(buf, len, GFP_KERNEL);
 245         if (!input)
 246                 return -ENOMEM;
 247
 248         pos = strim(input);
 249         if (strlen(pos) + 1 > NSLABEL_NAME_LEN) {
 250                 rc = -EINVAL;
 251                 goto out;
 252         }
 253
 254         alt_name = kzalloc(NSLABEL_NAME_LEN, GFP_KERNEL);
 255         if (!alt_name) {
 256                 rc = -ENOMEM;
 257                 goto out;
 258         }
 259         kfree(*ns_altname);
 260         *ns_altname = alt_name;
 261         sprintf(*ns_altname, "%s", pos);
 262         rc = len;
 263
 264 out:
 265         kfree(input);
 266         return rc;
 267 }
 268
 269 static resource_size_t nd_namespace_blk_size(struct nd_namespace_blk *nsblk)
 270 {
 271         struct nd_region *nd_region = to_nd_region(nsblk->common.dev.parent);
 272         struct nd_mapping *nd_mapping = &nd_region->mapping[0];
 273         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 274         struct nd_label_id label_id;
 275         resource_size_t size = 0;
 276         struct resource *res;
 277
 278         if (!nsblk->uuid)
 279                 return 0;
 280         nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
 281         for_each_dpa_resource(ndd, res)
 282                 if (strcmp(res->name, label_id.id) == 0)
 283                         size += resource_size(res);
 284         return size;
 285 }
 286
 287 static bool __nd_namespace_blk_validate(struct nd_namespace_blk *nsblk)
 288 {
 289         struct nd_region *nd_region = to_nd_region(nsblk->common.dev.parent);
 290         struct nd_mapping *nd_mapping = &nd_region->mapping[0];
 291         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 292         struct nd_label_id label_id;
 293         struct resource *res;
 294         int count, i;
 295
 296         if (!nsblk->uuid || !nsblk->lbasize || !ndd)
 297                 return false;
 298
 299         count = 0;
 300         nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
 301         for_each_dpa_resource(ndd, res) {
 302                 if (strcmp(res->name, label_id.id) != 0)
 303                         continue;
 304                 /*
 305                  * Resources with unacknowledged adjustments indicate a
 306                  * failure to update labels
 307                  */
 308                 if (res->flags & DPA_RESOURCE_ADJUSTED)
 309                         return false;
 310                 count++;
 311         }
 312
 313         /* These values match after a successful label update */
 314         if (count != nsblk->num_resources)
 315                 return false;
 316
 317         for (i = 0; i < nsblk->num_resources; i++) {
 318                 struct resource *found = NULL;
 319
 320                 for_each_dpa_resource(ndd, res)
 321                         if (res == nsblk->res[i]) {
 322                                 found = res;
 323                                 break;
 324                         }
 325                 /* stale resource */
 326                 if (!found)
 327                         return false;
 328         }
 329
 330         return true;
 331 }
 332
 333 resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk)
 334 {
 335         resource_size_t size;
 336
 337         nvdimm_bus_lock(&nsblk->common.dev);
 338         size = __nd_namespace_blk_validate(nsblk);
 339         nvdimm_bus_unlock(&nsblk->common.dev);
 340
 341         return size;
 342 }
 343 EXPORT_SYMBOL(nd_namespace_blk_validate);
 344
 345
 346 static int nd_namespace_label_update(struct nd_region *nd_region,
 347                 struct device *dev)
 348 {
 349         dev_WARN_ONCE(dev, dev->driver || to_ndns(dev)->claim,
 350                         "namespace must be idle during label update\n");
 351         if (dev->driver || to_ndns(dev)->claim)
 352                 return 0;
 353
 354         /*
 355          * Only allow label writes that will result in a valid namespace
 356          * or deletion of an existing namespace.
 357          */
 358         if (is_namespace_pmem(dev)) {
 359                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
 360                 resource_size_t size = resource_size(&nspm->nsio.res);
 361
 362                 if (size == 0 && nspm->uuid)
 363                         /* delete allocation */;
 364                 else if (!nspm->uuid)
 365                         return 0;
 366
 367                 return nd_pmem_namespace_label_update(nd_region, nspm, size);
 368         } else if (is_namespace_blk(dev)) {
 369                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 370                 resource_size_t size = nd_namespace_blk_size(nsblk);
 371
 372                 if (size == 0 && nsblk->uuid)
 373                         /* delete allocation */;
 374                 else if (!nsblk->uuid || !nsblk->lbasize)
 375                         return 0;
 376
 377                 return nd_blk_namespace_label_update(nd_region, nsblk, size);
 378         } else
 379                 return -ENXIO;
 380 }
 381
 382 static ssize_t alt_name_store(struct device *dev,
 383                 struct device_attribute *attr, const char *buf, size_t len)
 384 {
 385         struct nd_region *nd_region = to_nd_region(dev->parent);
 386         ssize_t rc;
 387
 388         nd_device_lock(dev);
 389         nvdimm_bus_lock(dev);
 390         wait_nvdimm_bus_probe_idle(dev);
 391         rc = __alt_name_store(dev, buf, len);
 392         if (rc >= 0)
 393                 rc = nd_namespace_label_update(nd_region, dev);
 394         dev_dbg(dev, "%s(%zd)\n", rc < 0 ? "fail " : "", rc);
 395         nvdimm_bus_unlock(dev);
 396         nd_device_unlock(dev);
 397
 398         return rc < 0 ? rc : len;
 399 }
 400
 401 static ssize_t alt_name_show(struct device *dev,
 402                 struct device_attribute *attr, char *buf)
 403 {
 404         char *ns_altname;
 405
 406         if (is_namespace_pmem(dev)) {
 407                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
 408
 409                 ns_altname = nspm->alt_name;
 410         } else if (is_namespace_blk(dev)) {
 411                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 412
 413                 ns_altname = nsblk->alt_name;
 414         } else
 415                 return -ENXIO;
 416
 417         return sprintf(buf, "%s\n", ns_altname ? ns_altname : "");
 418 }
 419 static DEVICE_ATTR_RW(alt_name);
 420
 421 static int scan_free(struct nd_region *nd_region,
 422                 struct nd_mapping *nd_mapping, struct nd_label_id *label_id,
 423                 resource_size_t n)
 424 {
 425         bool is_blk = strncmp(label_id->id, "blk", 3) == 0;
 426         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 427         int rc = 0;
 428
 429         while (n) {
 430                 struct resource *res, *last;
 431                 resource_size_t new_start;
 432
 433                 last = NULL;
 434                 for_each_dpa_resource(ndd, res)
 435                         if (strcmp(res->name, label_id->id) == 0)
 436                                 last = res;
 437                 res = last;
 438                 if (!res)
 439                         return 0;
 440
 441                 if (n >= resource_size(res)) {
 442                         n -= resource_size(res);
 443                         nd_dbg_dpa(nd_region, ndd, res, "delete %d\n", rc);
 444                         nvdimm_free_dpa(ndd, res);
 445                         /* retry with last resource deleted */
 446                         continue;
 447                 }
 448
 449                 /*
 450                  * Keep BLK allocations relegated to high DPA as much as
 451                  * possible
 452                  */
 453                 if (is_blk)
 454                         new_start = res->start + n;
 455                 else
 456                         new_start = res->start;
 457
 458                 rc = adjust_resource(res, new_start, resource_size(res) - n);
 459                 if (rc == 0)
 460                         res->flags |= DPA_RESOURCE_ADJUSTED;
 461                 nd_dbg_dpa(nd_region, ndd, res, "shrink %d\n", rc);
 462                 break;
 463         }
 464
 465         return rc;
 466 }
 467
 468 /**
 469  * shrink_dpa_allocation - for each dimm in region free n bytes for label_id
 470  * @nd_region: the set of dimms to reclaim @n bytes from
 471  * @label_id: unique identifier for the namespace consuming this dpa range
 472  * @n: number of bytes per-dimm to release
 473  *
 474  * Assumes resources are ordered.  Starting from the end try to
 475  * adjust_resource() the allocation to @n, but if @n is larger than the
 476  * allocation delete it and find the 'new' last allocation in the label
 477  * set.
 478  */
 479 static int shrink_dpa_allocation(struct nd_region *nd_region,
 480                 struct nd_label_id *label_id, resource_size_t n)
 481 {
 482         int i;
 483
 484         for (i = 0; i < nd_region->ndr_mappings; i++) {
 485                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
 486                 int rc;
 487
 488                 rc = scan_free(nd_region, nd_mapping, label_id, n);
 489                 if (rc)
 490                         return rc;
 491         }
 492
 493         return 0;
 494 }
 495
 496 static resource_size_t init_dpa_allocation(struct nd_label_id *label_id,
 497                 struct nd_region *nd_region, struct nd_mapping *nd_mapping,
 498                 resource_size_t n)
 499 {
 500         bool is_blk = strncmp(label_id->id, "blk", 3) == 0;
 501         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 502         resource_size_t first_dpa;
 503         struct resource *res;
 504         int rc = 0;
 505
 506         /* allocate blk from highest dpa first */
 507         if (is_blk)
 508                 first_dpa = nd_mapping->start + nd_mapping->size - n;
 509         else
 510                 first_dpa = nd_mapping->start;
 511
 512         /* first resource allocation for this label-id or dimm */
 513         res = nvdimm_allocate_dpa(ndd, label_id, first_dpa, n);
 514         if (!res)
 515                 rc = -EBUSY;
 516
 517         nd_dbg_dpa(nd_region, ndd, res, "init %d\n", rc);
 518         return rc ? n : 0;
 519 }
 520
 521
 522 /**
 523  * space_valid() - validate free dpa space against constraints
 524  * @nd_region: hosting region of the free space
 525  * @ndd: dimm device data for debug
 526  * @label_id: namespace id to allocate space
 527  * @prev: potential allocation that precedes free space
 528  * @next: allocation that follows the given free space range
 529  * @exist: first allocation with same id in the mapping
 530  * @n: range that must satisfied for pmem allocations
 531  * @valid: free space range to validate
 532  *
 533  * BLK-space is valid as long as it does not precede a PMEM
 534  * allocation in a given region. PMEM-space must be contiguous
 535  * and adjacent to an existing existing allocation (if one
 536  * exists).  If reserving PMEM any space is valid.
 537  */
 538 static void space_valid(struct nd_region *nd_region, struct nvdimm_drvdata *ndd,
 539                 struct nd_label_id *label_id, struct resource *prev,
 540                 struct resource *next, struct resource *exist,
 541                 resource_size_t n, struct resource *valid)
 542 {
 543         bool is_reserve = strcmp(label_id->id, "pmem-reserve") == 0;
 544         bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
 545         unsigned long align;
 546
 547         align = nd_region->align / nd_region->ndr_mappings;
 548         valid->start = ALIGN(valid->start, align);
 549         valid->end = ALIGN_DOWN(valid->end + 1, align) - 1;
 550
 551         if (valid->start >= valid->end)
 552                 goto invalid;
 553
 554         if (is_reserve)
 555                 return;
 556
 557         if (!is_pmem) {
 558                 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
 559                 struct nvdimm_bus *nvdimm_bus;
 560                 struct blk_alloc_info info = {
 561                         .nd_mapping = nd_mapping,
 562                         .available = nd_mapping->size,
 563                         .res = valid,
 564                 };
 565
 566                 WARN_ON(!is_nd_blk(&nd_region->dev));
 567                 nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
 568                 device_for_each_child(&nvdimm_bus->dev, &info, alias_dpa_busy);
 569                 return;
 570         }
 571
 572         /* allocation needs to be contiguous, so this is all or nothing */
 573         if (resource_size(valid) < n)
 574                 goto invalid;
 575
 576         /* we've got all the space we need and no existing allocation */
 577         if (!exist)
 578                 return;
 579
 580         /* allocation needs to be contiguous with the existing namespace */
 581         if (valid->start == exist->end + 1
 582                         || valid->end == exist->start - 1)
 583                 return;
 584
 585  invalid:
 586         /* truncate @valid size to 0 */
 587         valid->end = valid->start - 1;
 588 }
 589
 590 enum alloc_loc {
 591         ALLOC_ERR = 0, ALLOC_BEFORE, ALLOC_MID, ALLOC_AFTER,
 592 };
 593
 594 static resource_size_t scan_allocate(struct nd_region *nd_region,
 595                 struct nd_mapping *nd_mapping, struct nd_label_id *label_id,
 596                 resource_size_t n)
 597 {
 598         resource_size_t mapping_end = nd_mapping->start + nd_mapping->size - 1;
 599         bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
 600         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 601         struct resource *res, *exist = NULL, valid;
 602         const resource_size_t to_allocate = n;
 603         int first;
 604
 605         for_each_dpa_resource(ndd, res)
 606                 if (strcmp(label_id->id, res->name) == 0)
 607                         exist = res;
 608
 609         valid.start = nd_mapping->start;
 610         valid.end = mapping_end;
 611         valid.name = "free space";
 612  retry:
 613         first = 0;
 614         for_each_dpa_resource(ndd, res) {
 615                 struct resource *next = res->sibling, *new_res = NULL;
 616                 resource_size_t allocate, available = 0;
 617                 enum alloc_loc loc = ALLOC_ERR;
 618                 const char *action;
 619                 int rc = 0;
 620
 621                 /* ignore resources outside this nd_mapping */
 622                 if (res->start > mapping_end)
 623                         continue;
 624                 if (res->end < nd_mapping->start)
 625                         continue;
 626
 627                 /* space at the beginning of the mapping */
 628                 if (!first++ && res->start > nd_mapping->start) {
 629                         valid.start = nd_mapping->start;
 630                         valid.end = res->start - 1;
 631                         space_valid(nd_region, ndd, label_id, NULL, next, exist,
 632                                         to_allocate, &valid);
 633                         available = resource_size(&valid);
 634                         if (available)
 635                                 loc = ALLOC_BEFORE;
 636                 }
 637
 638                 /* space between allocations */
 639                 if (!loc && next) {
 640                         valid.start = res->start + resource_size(res);
 641                         valid.end = min(mapping_end, next->start - 1);
 642                         space_valid(nd_region, ndd, label_id, res, next, exist,
 643                                         to_allocate, &valid);
 644                         available = resource_size(&valid);
 645                         if (available)
 646                                 loc = ALLOC_MID;
 647                 }
 648
 649                 /* space at the end of the mapping */
 650                 if (!loc && !next) {
 651                         valid.start = res->start + resource_size(res);
 652                         valid.end = mapping_end;
 653                         space_valid(nd_region, ndd, label_id, res, next, exist,
 654                                         to_allocate, &valid);
 655                         available = resource_size(&valid);
 656                         if (available)
 657                                 loc = ALLOC_AFTER;
 658                 }
 659
 660                 if (!loc || !available)
 661                         continue;
 662                 allocate = min(available, n);
 663                 switch (loc) {
 664                 case ALLOC_BEFORE:
 665                         if (strcmp(res->name, label_id->id) == 0) {
 666                                 /* adjust current resource up */
 667                                 rc = adjust_resource(res, res->start - allocate,
 668                                                 resource_size(res) + allocate);
 669                                 action = "cur grow up";
 670                         } else
 671                                 action = "allocate";
 672                         break;
 673                 case ALLOC_MID:
 674                         if (strcmp(next->name, label_id->id) == 0) {
 675                                 /* adjust next resource up */
 676                                 rc = adjust_resource(next, next->start
 677                                                 - allocate, resource_size(next)
 678                                                 + allocate);
 679                                 new_res = next;
 680                                 action = "next grow up";
 681                         } else if (strcmp(res->name, label_id->id) == 0) {
 682                                 action = "grow down";
 683                         } else
 684                                 action = "allocate";
 685                         break;
 686                 case ALLOC_AFTER:
 687                         if (strcmp(res->name, label_id->id) == 0)
 688                                 action = "grow down";
 689                         else
 690                                 action = "allocate";
 691                         break;
 692                 default:
 693                         return n;
 694                 }
 695
 696                 if (strcmp(action, "allocate") == 0) {
 697                         /* BLK allocate bottom up */
 698                         if (!is_pmem)
 699                                 valid.start += available - allocate;
 700
 701                         new_res = nvdimm_allocate_dpa(ndd, label_id,
 702                                         valid.start, allocate);
 703                         if (!new_res)
 704                                 rc = -EBUSY;
 705                 } else if (strcmp(action, "grow down") == 0) {
 706                         /* adjust current resource down */
 707                         rc = adjust_resource(res, res->start, resource_size(res)
 708                                         + allocate);
 709                         if (rc == 0)
 710                                 res->flags |= DPA_RESOURCE_ADJUSTED;
 711                 }
 712
 713                 if (!new_res)
 714                         new_res = res;
 715
 716                 nd_dbg_dpa(nd_region, ndd, new_res, "%s(%d) %d\n",
 717                                 action, loc, rc);
 718
 719                 if (rc)
 720                         return n;
 721
 722                 n -= allocate;
 723                 if (n) {
 724                         /*
 725                          * Retry scan with newly inserted resources.
 726                          * For example, if we did an ALLOC_BEFORE
 727                          * insertion there may also have been space
 728                          * available for an ALLOC_AFTER insertion, so we
 729                          * need to check this same resource again
 730                          */
 731                         goto retry;
 732                 } else
 733                         return 0;
 734         }
 735
 736         /*
 737          * If we allocated nothing in the BLK case it may be because we are in
 738          * an initial "pmem-reserve pass".  Only do an initial BLK allocation
 739          * when none of the DPA space is reserved.
 740          */
 741         if ((is_pmem || !ndd->dpa.child) && n == to_allocate)
 742                 return init_dpa_allocation(label_id, nd_region, nd_mapping, n);
 743         return n;
 744 }
 745
 746 static int merge_dpa(struct nd_region *nd_region,
 747                 struct nd_mapping *nd_mapping, struct nd_label_id *label_id)
 748 {
 749         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 750         struct resource *res;
 751
 752         if (strncmp("pmem", label_id->id, 4) == 0)
 753                 return 0;
 754  retry:
 755         for_each_dpa_resource(ndd, res) {
 756                 int rc;
 757                 struct resource *next = res->sibling;
 758                 resource_size_t end = res->start + resource_size(res);
 759
 760                 if (!next || strcmp(res->name, label_id->id) != 0
 761                                 || strcmp(next->name, label_id->id) != 0
 762                                 || end != next->start)
 763                         continue;
 764                 end += resource_size(next);
 765                 nvdimm_free_dpa(ndd, next);
 766                 rc = adjust_resource(res, res->start, end - res->start);
 767                 nd_dbg_dpa(nd_region, ndd, res, "merge %d\n", rc);
 768                 if (rc)
 769                         return rc;
 770                 res->flags |= DPA_RESOURCE_ADJUSTED;
 771                 goto retry;
 772         }
 773
 774         return 0;
 775 }
 776
 777 int __reserve_free_pmem(struct device *dev, void *data)
 778 {
 779         struct nvdimm *nvdimm = data;
 780         struct nd_region *nd_region;
 781         struct nd_label_id label_id;
 782         int i;
 783
 784         if (!is_memory(dev))
 785                 return 0;
 786
 787         nd_region = to_nd_region(dev);
 788         if (nd_region->ndr_mappings == 0)
 789                 return 0;
 790
 791         memset(&label_id, 0, sizeof(label_id));
 792         strcat(label_id.id, "pmem-reserve");
 793         for (i = 0; i < nd_region->ndr_mappings; i++) {
 794                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
 795                 resource_size_t n, rem = 0;
 796
 797                 if (nd_mapping->nvdimm != nvdimm)
 798                         continue;
 799
 800                 n = nd_pmem_available_dpa(nd_region, nd_mapping, &rem);
 801                 if (n == 0)
 802                         return 0;
 803                 rem = scan_allocate(nd_region, nd_mapping, &label_id, n);
 804                 dev_WARN_ONCE(&nd_region->dev, rem,
 805                                 "pmem reserve underrun: %#llx of %#llx bytes\n",
 806                                 (unsigned long long) n - rem,
 807                                 (unsigned long long) n);
 808                 return rem ? -ENXIO : 0;
 809         }
 810
 811         return 0;
 812 }
 813
 814 void release_free_pmem(struct nvdimm_bus *nvdimm_bus,
 815                 struct nd_mapping *nd_mapping)
 816 {
 817         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 818         struct resource *res, *_res;
 819
 820         for_each_dpa_resource_safe(ndd, res, _res)
 821                 if (strcmp(res->name, "pmem-reserve") == 0)
 822                         nvdimm_free_dpa(ndd, res);
 823 }
 824
 825 static int reserve_free_pmem(struct nvdimm_bus *nvdimm_bus,
 826                 struct nd_mapping *nd_mapping)
 827 {
 828         struct nvdimm *nvdimm = nd_mapping->nvdimm;
 829         int rc;
 830
 831         rc = device_for_each_child(&nvdimm_bus->dev, nvdimm,
 832                         __reserve_free_pmem);
 833         if (rc)
 834                 release_free_pmem(nvdimm_bus, nd_mapping);
 835         return rc;
 836 }
 837
 838 /**
 839  * grow_dpa_allocation - for each dimm allocate n bytes for @label_id
 840  * @nd_region: the set of dimms to allocate @n more bytes from
 841  * @label_id: unique identifier for the namespace consuming this dpa range
 842  * @n: number of bytes per-dimm to add to the existing allocation
 843  *
 844  * Assumes resources are ordered.  For BLK regions, first consume
 845  * BLK-only available DPA free space, then consume PMEM-aliased DPA
 846  * space starting at the highest DPA.  For PMEM regions start
 847  * allocations from the start of an interleave set and end at the first
 848  * BLK allocation or the end of the interleave set, whichever comes
 849  * first.
 850  */
 851 static int grow_dpa_allocation(struct nd_region *nd_region,
 852                 struct nd_label_id *label_id, resource_size_t n)
 853 {
 854         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
 855         bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
 856         int i;
 857
 858         for (i = 0; i < nd_region->ndr_mappings; i++) {
 859                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
 860                 resource_size_t rem = n;
 861                 int rc, j;
 862
 863                 /*
 864                  * In the BLK case try once with all unallocated PMEM
 865                  * reserved, and once without
 866                  */
 867                 for (j = is_pmem; j < 2; j++) {
 868                         bool blk_only = j == 0;
 869
 870                         if (blk_only) {
 871                                 rc = reserve_free_pmem(nvdimm_bus, nd_mapping);
 872                                 if (rc)
 873                                         return rc;
 874                         }
 875                         rem = scan_allocate(nd_region, nd_mapping,
 876                                         label_id, rem);
 877                         if (blk_only)
 878                                 release_free_pmem(nvdimm_bus, nd_mapping);
 879
 880                         /* try again and allow encroachments into PMEM */
 881                         if (rem == 0)
 882                                 break;
 883                 }
 884
 885                 dev_WARN_ONCE(&nd_region->dev, rem,
 886                                 "allocation underrun: %#llx of %#llx bytes\n",
 887                                 (unsigned long long) n - rem,
 888                                 (unsigned long long) n);
 889                 if (rem)
 890                         return -ENXIO;
 891
 892                 rc = merge_dpa(nd_region, nd_mapping, label_id);
 893                 if (rc)
 894                         return rc;
 895         }
 896
 897         return 0;
 898 }
 899
 900 static void nd_namespace_pmem_set_resource(struct nd_region *nd_region,
 901                 struct nd_namespace_pmem *nspm, resource_size_t size)
 902 {
 903         struct resource *res = &nspm->nsio.res;
 904         resource_size_t offset = 0;
 905
 906         if (size && !nspm->uuid) {
 907                 WARN_ON_ONCE(1);
 908                 size = 0;
 909         }
 910
 911         if (size && nspm->uuid) {
 912                 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
 913                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 914                 struct nd_label_id label_id;
 915                 struct resource *res;
 916
 917                 if (!ndd) {
 918                         size = 0;
 919                         goto out;
 920                 }
 921
 922                 nd_label_gen_id(&label_id, nspm->uuid, 0);
 923
 924                 /* calculate a spa offset from the dpa allocation offset */
 925                 for_each_dpa_resource(ndd, res)
 926                         if (strcmp(res->name, label_id.id) == 0) {
 927                                 offset = (res->start - nd_mapping->start)
 928                                         * nd_region->ndr_mappings;
 929                                 goto out;
 930                         }
 931
 932                 WARN_ON_ONCE(1);
 933                 size = 0;
 934         }
 935
 936  out:
 937         res->start = nd_region->ndr_start + offset;
 938         res->end = res->start + size - 1;
 939 }
 940
 941 static bool uuid_not_set(const u8 *uuid, struct device *dev, const char *where)
 942 {
 943         if (!uuid) {
 944                 dev_dbg(dev, "%s: uuid not set\n", where);
 945                 return true;
 946         }
 947         return false;
 948 }
 949
 950 static ssize_t __size_store(struct device *dev, unsigned long long val)
 951 {
 952         resource_size_t allocated = 0, available = 0;
 953         struct nd_region *nd_region = to_nd_region(dev->parent);
 954         struct nd_namespace_common *ndns = to_ndns(dev);
 955         struct nd_mapping *nd_mapping;
 956         struct nvdimm_drvdata *ndd;
 957         struct nd_label_id label_id;
 958         u32 flags = 0, remainder;
 959         int rc, i, id = -1;
 960         u8 *uuid = NULL;
 961
 962         if (dev->driver || ndns->claim)
 963                 return -EBUSY;
 964
 965         if (is_namespace_pmem(dev)) {
 966                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
 967
 968                 uuid = nspm->uuid;
 969                 id = nspm->id;
 970         } else if (is_namespace_blk(dev)) {
 971                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 972
 973                 uuid = nsblk->uuid;
 974                 flags = NSLABEL_FLAG_LOCAL;
 975                 id = nsblk->id;
 976         }
 977
 978         /*
 979          * We need a uuid for the allocation-label and dimm(s) on which
 980          * to store the label.
 981          */
 982         if (uuid_not_set(uuid, dev, __func__))
 983                 return -ENXIO;
 984         if (nd_region->ndr_mappings == 0) {
 985                 dev_dbg(dev, "not associated with dimm(s)\n");
 986                 return -ENXIO;
 987         }
 988
 989         div_u64_rem(val, nd_region->align, &remainder);
 990         if (remainder) {
 991                 dev_dbg(dev, "%llu is not %ldK aligned\n", val,
 992                                 nd_region->align / SZ_1K);
 993                 return -EINVAL;
 994         }
 995
 996         nd_label_gen_id(&label_id, uuid, flags);
 997         for (i = 0; i < nd_region->ndr_mappings; i++) {
 998                 nd_mapping = &nd_region->mapping[i];
 999                 ndd = to_ndd(nd_mapping);
1000
1001                 /*
1002                  * All dimms in an interleave set, or the base dimm for a blk
1003                  * region, need to be enabled for the size to be changed.
1004                  */
1005                 if (!ndd)
1006                         return -ENXIO;
1007
1008                 allocated += nvdimm_allocated_dpa(ndd, &label_id);
1009         }
1010         available = nd_region_allocatable_dpa(nd_region);
1011
1012         if (val > available + allocated)
1013                 return -ENOSPC;
1014
1015         if (val == allocated)
1016                 return 0;
1017
1018         val = div_u64(val, nd_region->ndr_mappings);
1019         allocated = div_u64(allocated, nd_region->ndr_mappings);
1020         if (val < allocated)
1021                 rc = shrink_dpa_allocation(nd_region, &label_id,
1022                                 allocated - val);
1023         else
1024                 rc = grow_dpa_allocation(nd_region, &label_id, val - allocated);
1025
1026         if (rc)
1027                 return rc;
1028
1029         if (is_namespace_pmem(dev)) {
1030                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1031
1032                 nd_namespace_pmem_set_resource(nd_region, nspm,
1033                                 val * nd_region->ndr_mappings);
1034         }
1035
1036         /*
1037          * Try to delete the namespace if we deleted all of its
1038          * allocation, this is not the seed or 0th device for the
1039          * region, and it is not actively claimed by a btt, pfn, or dax
1040          * instance.
1041          */
1042         if (val == 0 && id != 0 && nd_region->ns_seed != dev && !ndns->claim)
1043                 nd_device_unregister(dev, ND_ASYNC);
1044
1045         return rc;
1046 }
1047
1048 static ssize_t size_store(struct device *dev,
1049                 struct device_attribute *attr, const char *buf, size_t len)
1050 {
1051         struct nd_region *nd_region = to_nd_region(dev->parent);
1052         unsigned long long val;
1053         u8 **uuid = NULL;
1054         int rc;
1055
1056         rc = kstrtoull(buf, 0, &val);
1057         if (rc)
1058                 return rc;
1059
1060         nd_device_lock(dev);
1061         nvdimm_bus_lock(dev);
1062         wait_nvdimm_bus_probe_idle(dev);
1063         rc = __size_store(dev, val);
1064         if (rc >= 0)
1065                 rc = nd_namespace_label_update(nd_region, dev);
1066
1067         if (is_namespace_pmem(dev)) {
1068                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1069
1070                 uuid = &nspm->uuid;
1071         } else if (is_namespace_blk(dev)) {
1072                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1073
1074                 uuid = &nsblk->uuid;
1075         }
1076
1077         if (rc == 0 && val == 0 && uuid) {
1078                 /* setting size zero == 'delete namespace' */
1079                 kfree(*uuid);
1080                 *uuid = NULL;
1081         }
1082
1083         dev_dbg(dev, "%llx %s (%d)\n", val, rc < 0 ? "fail" : "success", rc);
1084
1085         nvdimm_bus_unlock(dev);
1086         nd_device_unlock(dev);
1087
1088         return rc < 0 ? rc : len;
1089 }
1090
1091 resource_size_t __nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
1092 {
1093         struct device *dev = &ndns->dev;
1094
1095         if (is_namespace_pmem(dev)) {
1096                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1097
1098                 return resource_size(&nspm->nsio.res);
1099         } else if (is_namespace_blk(dev)) {
1100                 return nd_namespace_blk_size(to_nd_namespace_blk(dev));
1101         } else if (is_namespace_io(dev)) {
1102                 struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
1103
1104                 return resource_size(&nsio->res);
1105         } else
1106                 WARN_ONCE(1, "unknown namespace type\n");
1107         return 0;
1108 }
1109
1110 resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
1111 {
1112         resource_size_t size;
1113
1114         nvdimm_bus_lock(&ndns->dev);
1115         size = __nvdimm_namespace_capacity(ndns);
1116         nvdimm_bus_unlock(&ndns->dev);
1117
1118         return size;
1119 }
1120 EXPORT_SYMBOL(nvdimm_namespace_capacity);
1121
1122 bool nvdimm_namespace_locked(struct nd_namespace_common *ndns)
1123 {
1124         int i;
1125         bool locked = false;
1126         struct device *dev = &ndns->dev;
1127         struct nd_region *nd_region = to_nd_region(dev->parent);
1128
1129         for (i = 0; i < nd_region->ndr_mappings; i++) {
1130                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1131                 struct nvdimm *nvdimm = nd_mapping->nvdimm;
1132
1133                 if (test_bit(NDD_LOCKED, &nvdimm->flags)) {
1134                         dev_dbg(dev, "%s locked\n", nvdimm_name(nvdimm));
1135                         locked = true;
1136                 }
1137         }
1138         return locked;
1139 }
1140 EXPORT_SYMBOL(nvdimm_namespace_locked);
1141
1142 static ssize_t size_show(struct device *dev,
1143                 struct device_attribute *attr, char *buf)
1144 {
1145         return sprintf(buf, "%llu\n", (unsigned long long)
1146                         nvdimm_namespace_capacity(to_ndns(dev)));
1147 }
1148 static DEVICE_ATTR(size, 0444, size_show, size_store);
1149
1150 static u8 *namespace_to_uuid(struct device *dev)
1151 {
1152         if (is_namespace_pmem(dev)) {
1153                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1154
1155                 return nspm->uuid;
1156         } else if (is_namespace_blk(dev)) {
1157                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1158
1159                 return nsblk->uuid;
1160         } else
1161                 return ERR_PTR(-ENXIO);
1162 }
1163
1164 static ssize_t uuid_show(struct device *dev,
1165                 struct device_attribute *attr, char *buf)
1166 {
1167         u8 *uuid = namespace_to_uuid(dev);
1168
1169         if (IS_ERR(uuid))
1170                 return PTR_ERR(uuid);
1171         if (uuid)
1172                 return sprintf(buf, "%pUb\n", uuid);
1173         return sprintf(buf, "\n");
1174 }
1175
1176 /**
1177  * namespace_update_uuid - check for a unique uuid and whether we're "renaming"
1178  * @nd_region: parent region so we can updates all dimms in the set
1179  * @dev: namespace type for generating label_id
1180  * @new_uuid: incoming uuid
1181  * @old_uuid: reference to the uuid storage location in the namespace object
1182  */
1183 static int namespace_update_uuid(struct nd_region *nd_region,
1184                 struct device *dev, u8 *new_uuid, u8 **old_uuid)
1185 {
1186         u32 flags = is_namespace_blk(dev) ? NSLABEL_FLAG_LOCAL : 0;
1187         struct nd_label_id old_label_id;
1188         struct nd_label_id new_label_id;
1189         int i;
1190
1191         if (!nd_is_uuid_unique(dev, new_uuid))
1192                 return -EINVAL;
1193
1194         if (*old_uuid == NULL)
1195                 goto out;
1196
1197         /*
1198          * If we've already written a label with this uuid, then it's
1199          * too late to rename because we can't reliably update the uuid
1200          * without losing the old namespace.  Userspace must delete this
1201          * namespace to abandon the old uuid.
1202          */
1203         for (i = 0; i < nd_region->ndr_mappings; i++) {
1204                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1205
1206                 /*
1207                  * This check by itself is sufficient because old_uuid
1208                  * would be NULL above if this uuid did not exist in the
1209                  * currently written set.
1210                  *
1211                  * FIXME: can we delete uuid with zero dpa allocated?
1212                  */
1213                 if (list_empty(&nd_mapping->labels))
1214                         return -EBUSY;
1215         }
1216
1217         nd_label_gen_id(&old_label_id, *old_uuid, flags);
1218         nd_label_gen_id(&new_label_id, new_uuid, flags);
1219         for (i = 0; i < nd_region->ndr_mappings; i++) {
1220                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1221                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1222                 struct nd_label_ent *label_ent;
1223                 struct resource *res;
1224
1225                 for_each_dpa_resource(ndd, res)
1226                         if (strcmp(res->name, old_label_id.id) == 0)
1227                                 sprintf((void *) res->name, "%s",
1228                                                 new_label_id.id);
1229
1230                 mutex_lock(&nd_mapping->lock);
1231                 list_for_each_entry(label_ent, &nd_mapping->labels, list) {
1232                         struct nd_namespace_label *nd_label = label_ent->label;
1233                         struct nd_label_id label_id;
1234
1235                         if (!nd_label)
1236                                 continue;
1237                         nd_label_gen_id(&label_id, nd_label->uuid,
1238                                         nsl_get_flags(ndd, nd_label));
1239                         if (strcmp(old_label_id.id, label_id.id) == 0)
1240                                 set_bit(ND_LABEL_REAP, &label_ent->flags);
1241                 }
1242                 mutex_unlock(&nd_mapping->lock);
1243         }
1244         kfree(*old_uuid);
1245  out:
1246         *old_uuid = new_uuid;
1247         return 0;
1248 }
1249
1250 static ssize_t uuid_store(struct device *dev,
1251                 struct device_attribute *attr, const char *buf, size_t len)
1252 {
1253         struct nd_region *nd_region = to_nd_region(dev->parent);
1254         u8 *uuid = NULL;
1255         ssize_t rc = 0;
1256         u8 **ns_uuid;
1257
1258         if (is_namespace_pmem(dev)) {
1259                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1260
1261                 ns_uuid = &nspm->uuid;
1262         } else if (is_namespace_blk(dev)) {
1263                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1264
1265                 ns_uuid = &nsblk->uuid;
1266         } else
1267                 return -ENXIO;
1268
1269         nd_device_lock(dev);
1270         nvdimm_bus_lock(dev);
1271         wait_nvdimm_bus_probe_idle(dev);
1272         if (to_ndns(dev)->claim)
1273                 rc = -EBUSY;
1274         if (rc >= 0)
1275                 rc = nd_uuid_store(dev, &uuid, buf, len);
1276         if (rc >= 0)
1277                 rc = namespace_update_uuid(nd_region, dev, uuid, ns_uuid);
1278         if (rc >= 0)
1279                 rc = nd_namespace_label_update(nd_region, dev);
1280         else
1281                 kfree(uuid);
1282         dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
1283                         buf[len - 1] == '\n' ? "" : "\n");
1284         nvdimm_bus_unlock(dev);
1285         nd_device_unlock(dev);
1286
1287         return rc < 0 ? rc : len;
1288 }
1289 static DEVICE_ATTR_RW(uuid);
1290
1291 static ssize_t resource_show(struct device *dev,
1292                 struct device_attribute *attr, char *buf)
1293 {
1294         struct resource *res;
1295
1296         if (is_namespace_pmem(dev)) {
1297                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1298
1299                 res = &nspm->nsio.res;
1300         } else if (is_namespace_io(dev)) {
1301                 struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
1302
1303                 res = &nsio->res;
1304         } else
1305                 return -ENXIO;
1306
1307         /* no address to convey if the namespace has no allocation */
1308         if (resource_size(res) == 0)
1309                 return -ENXIO;
1310         return sprintf(buf, "%#llx\n", (unsigned long long) res->start);
1311 }
1312 static DEVICE_ATTR_ADMIN_RO(resource);
1313
1314 static const unsigned long blk_lbasize_supported[] = { 512, 520, 528,
1315         4096, 4104, 4160, 4224, 0 };
1316
1317 static const unsigned long pmem_lbasize_supported[] = { 512, 4096, 0 };
1318
1319 static ssize_t sector_size_show(struct device *dev,
1320                 struct device_attribute *attr, char *buf)
1321 {
1322         if (is_namespace_blk(dev)) {
1323                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1324
1325                 return nd_size_select_show(nsblk->lbasize,
1326                                 blk_lbasize_supported, buf);
1327         }
1328
1329         if (is_namespace_pmem(dev)) {
1330                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1331
1332                 return nd_size_select_show(nspm->lbasize,
1333                                 pmem_lbasize_supported, buf);
1334         }
1335         return -ENXIO;
1336 }
1337
1338 static ssize_t sector_size_store(struct device *dev,
1339                 struct device_attribute *attr, const char *buf, size_t len)
1340 {
1341         struct nd_region *nd_region = to_nd_region(dev->parent);
1342         const unsigned long *supported;
1343         unsigned long *lbasize;
1344         ssize_t rc = 0;
1345
1346         if (is_namespace_blk(dev)) {
1347                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1348
1349                 lbasize = &nsblk->lbasize;
1350                 supported = blk_lbasize_supported;
1351         } else if (is_namespace_pmem(dev)) {
1352                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1353
1354                 lbasize = &nspm->lbasize;
1355                 supported = pmem_lbasize_supported;
1356         } else
1357                 return -ENXIO;
1358
1359         nd_device_lock(dev);
1360         nvdimm_bus_lock(dev);
1361         if (to_ndns(dev)->claim)
1362                 rc = -EBUSY;
1363         if (rc >= 0)
1364                 rc = nd_size_select_store(dev, buf, lbasize, supported);
1365         if (rc >= 0)
1366                 rc = nd_namespace_label_update(nd_region, dev);
1367         dev_dbg(dev, "result: %zd %s: %s%s", rc, rc < 0 ? "tried" : "wrote",
1368                         buf, buf[len - 1] == '\n' ? "" : "\n");
1369         nvdimm_bus_unlock(dev);
1370         nd_device_unlock(dev);
1371
1372         return rc ? rc : len;
1373 }
1374 static DEVICE_ATTR_RW(sector_size);
1375
1376 static ssize_t dpa_extents_show(struct device *dev,
1377                 struct device_attribute *attr, char *buf)
1378 {
1379         struct nd_region *nd_region = to_nd_region(dev->parent);
1380         struct nd_label_id label_id;
1381         int count = 0, i;
1382         u8 *uuid = NULL;
1383         u32 flags = 0;
1384
1385         nvdimm_bus_lock(dev);
1386         if (is_namespace_pmem(dev)) {
1387                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1388
1389                 uuid = nspm->uuid;
1390                 flags = 0;
1391         } else if (is_namespace_blk(dev)) {
1392                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1393
1394                 uuid = nsblk->uuid;
1395                 flags = NSLABEL_FLAG_LOCAL;
1396         }
1397
1398         if (!uuid)
1399                 goto out;
1400
1401         nd_label_gen_id(&label_id, uuid, flags);
1402         for (i = 0; i < nd_region->ndr_mappings; i++) {
1403                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1404                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1405                 struct resource *res;
1406
1407                 for_each_dpa_resource(ndd, res)
1408                         if (strcmp(res->name, label_id.id) == 0)
1409                                 count++;
1410         }
1411  out:
1412         nvdimm_bus_unlock(dev);
1413
1414         return sprintf(buf, "%d\n", count);
1415 }
1416 static DEVICE_ATTR_RO(dpa_extents);
1417
1418 static int btt_claim_class(struct device *dev)
1419 {
1420         struct nd_region *nd_region = to_nd_region(dev->parent);
1421         int i, loop_bitmask = 0;
1422
1423         for (i = 0; i < nd_region->ndr_mappings; i++) {
1424                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1425                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1426                 struct nd_namespace_index *nsindex;
1427
1428                 /*
1429                  * If any of the DIMMs do not support labels the only
1430                  * possible BTT format is v1.
1431                  */
1432                 if (!ndd) {
1433                         loop_bitmask = 0;
1434                         break;
1435                 }
1436
1437                 nsindex = to_namespace_index(ndd, ndd->ns_current);
1438                 if (nsindex == NULL)
1439                         loop_bitmask |= 1;
1440                 else {
1441                         /* check whether existing labels are v1.1 or v1.2 */
1442                         if (__le16_to_cpu(nsindex->major) == 1
1443                                         && __le16_to_cpu(nsindex->minor) == 1)
1444                                 loop_bitmask |= 2;
1445                         else
1446                                 loop_bitmask |= 4;
1447                 }
1448         }
1449         /*
1450          * If nsindex is null loop_bitmask's bit 0 will be set, and if an index
1451          * block is found, a v1.1 label for any mapping will set bit 1, and a
1452          * v1.2 label will set bit 2.
1453          *
1454          * At the end of the loop, at most one of the three bits must be set.
1455          * If multiple bits were set, it means the different mappings disagree
1456          * about their labels, and this must be cleaned up first.
1457          *
1458          * If all the label index blocks are found to agree, nsindex of NULL
1459          * implies labels haven't been initialized yet, and when they will,
1460          * they will be of the 1.2 format, so we can assume BTT2.0
1461          *
1462          * If 1.1 labels are found, we enforce BTT1.1, and if 1.2 labels are
1463          * found, we enforce BTT2.0
1464          *
1465          * If the loop was never entered, default to BTT1.1 (legacy namespaces)
1466          */
1467         switch (loop_bitmask) {
1468         case 0:
1469         case 2:
1470                 return NVDIMM_CCLASS_BTT;
1471         case 1:
1472         case 4:
1473                 return NVDIMM_CCLASS_BTT2;
1474         default:
1475                 return -ENXIO;
1476         }
1477 }
1478
1479 static ssize_t holder_show(struct device *dev,
1480                 struct device_attribute *attr, char *buf)
1481 {
1482         struct nd_namespace_common *ndns = to_ndns(dev);
1483         ssize_t rc;
1484
1485         nd_device_lock(dev);
1486         rc = sprintf(buf, "%s\n", ndns->claim ? dev_name(ndns->claim) : "");
1487         nd_device_unlock(dev);
1488
1489         return rc;
1490 }
1491 static DEVICE_ATTR_RO(holder);
1492
1493 static int __holder_class_store(struct device *dev, const char *buf)
1494 {
1495         struct nd_namespace_common *ndns = to_ndns(dev);
1496
1497         if (dev->driver || ndns->claim)
1498                 return -EBUSY;
1499
1500         if (sysfs_streq(buf, "btt")) {
1501                 int rc = btt_claim_class(dev);
1502
1503                 if (rc < NVDIMM_CCLASS_NONE)
1504                         return rc;
1505                 ndns->claim_class = rc;
1506         } else if (sysfs_streq(buf, "pfn"))
1507                 ndns->claim_class = NVDIMM_CCLASS_PFN;
1508         else if (sysfs_streq(buf, "dax"))
1509                 ndns->claim_class = NVDIMM_CCLASS_DAX;
1510         else if (sysfs_streq(buf, ""))
1511                 ndns->claim_class = NVDIMM_CCLASS_NONE;
1512         else
1513                 return -EINVAL;
1514
1515         return 0;
1516 }
1517
1518 static ssize_t holder_class_store(struct device *dev,
1519                 struct device_attribute *attr, const char *buf, size_t len)
1520 {
1521         struct nd_region *nd_region = to_nd_region(dev->parent);
1522         int rc;
1523
1524         nd_device_lock(dev);
1525         nvdimm_bus_lock(dev);
1526         wait_nvdimm_bus_probe_idle(dev);
1527         rc = __holder_class_store(dev, buf);
1528         if (rc >= 0)
1529                 rc = nd_namespace_label_update(nd_region, dev);
1530         dev_dbg(dev, "%s(%d)\n", rc < 0 ? "fail " : "", rc);
1531         nvdimm_bus_unlock(dev);
1532         nd_device_unlock(dev);
1533
1534         return rc < 0 ? rc : len;
1535 }
1536
1537 static ssize_t holder_class_show(struct device *dev,
1538                 struct device_attribute *attr, char *buf)
1539 {
1540         struct nd_namespace_common *ndns = to_ndns(dev);
1541         ssize_t rc;
1542
1543         nd_device_lock(dev);
1544         if (ndns->claim_class == NVDIMM_CCLASS_NONE)
1545                 rc = sprintf(buf, "\n");
1546         else if ((ndns->claim_class == NVDIMM_CCLASS_BTT) ||
1547                         (ndns->claim_class == NVDIMM_CCLASS_BTT2))
1548                 rc = sprintf(buf, "btt\n");
1549         else if (ndns->claim_class == NVDIMM_CCLASS_PFN)
1550                 rc = sprintf(buf, "pfn\n");
1551         else if (ndns->claim_class == NVDIMM_CCLASS_DAX)
1552                 rc = sprintf(buf, "dax\n");
1553         else
1554                 rc = sprintf(buf, "<unknown>\n");
1555         nd_device_unlock(dev);
1556
1557         return rc;
1558 }
1559 static DEVICE_ATTR_RW(holder_class);
1560
1561 static ssize_t mode_show(struct device *dev,
1562                 struct device_attribute *attr, char *buf)
1563 {
1564         struct nd_namespace_common *ndns = to_ndns(dev);
1565         struct device *claim;
1566         char *mode;
1567         ssize_t rc;
1568
1569         nd_device_lock(dev);
1570         claim = ndns->claim;
1571         if (claim && is_nd_btt(claim))
1572                 mode = "safe";
1573         else if (claim && is_nd_pfn(claim))
1574                 mode = "memory";
1575         else if (claim && is_nd_dax(claim))
1576                 mode = "dax";
1577         else if (!claim && pmem_should_map_pages(dev))
1578                 mode = "memory";
1579         else
1580                 mode = "raw";
1581         rc = sprintf(buf, "%s\n", mode);
1582         nd_device_unlock(dev);
1583
1584         return rc;
1585 }
1586 static DEVICE_ATTR_RO(mode);
1587
1588 static ssize_t force_raw_store(struct device *dev,
1589                 struct device_attribute *attr, const char *buf, size_t len)
1590 {
1591         bool force_raw;
1592         int rc = strtobool(buf, &force_raw);
1593
1594         if (rc)
1595                 return rc;
1596
1597         to_ndns(dev)->force_raw = force_raw;
1598         return len;
1599 }
1600
1601 static ssize_t force_raw_show(struct device *dev,
1602                 struct device_attribute *attr, char *buf)
1603 {
1604         return sprintf(buf, "%d\n", to_ndns(dev)->force_raw);
1605 }
1606 static DEVICE_ATTR_RW(force_raw);
1607
1608 static struct attribute *nd_namespace_attributes[] = {
1609         &dev_attr_nstype.attr,
1610         &dev_attr_size.attr,
1611         &dev_attr_mode.attr,
1612         &dev_attr_uuid.attr,
1613         &dev_attr_holder.attr,
1614         &dev_attr_resource.attr,
1615         &dev_attr_alt_name.attr,
1616         &dev_attr_force_raw.attr,
1617         &dev_attr_sector_size.attr,
1618         &dev_attr_dpa_extents.attr,
1619         &dev_attr_holder_class.attr,
1620         NULL,
1621 };
1622
1623 static umode_t namespace_visible(struct kobject *kobj,
1624                 struct attribute *a, int n)
1625 {
1626         struct device *dev = container_of(kobj, struct device, kobj);
1627
1628         if (a == &dev_attr_resource.attr && is_namespace_blk(dev))
1629                 return 0;
1630
1631         if (is_namespace_pmem(dev) || is_namespace_blk(dev)) {
1632                 if (a == &dev_attr_size.attr)
1633                         return 0644;
1634
1635                 return a->mode;
1636         }
1637
1638         /* base is_namespace_io() attributes */
1639         if (a == &dev_attr_nstype.attr || a == &dev_attr_size.attr ||
1640             a == &dev_attr_holder.attr || a == &dev_attr_holder_class.attr ||
1641             a == &dev_attr_force_raw.attr || a == &dev_attr_mode.attr ||
1642             a == &dev_attr_resource.attr)
1643                 return a->mode;
1644
1645         return 0;
1646 }
1647
1648 static struct attribute_group nd_namespace_attribute_group = {
1649         .attrs = nd_namespace_attributes,
1650         .is_visible = namespace_visible,
1651 };
1652
1653 static const struct attribute_group *nd_namespace_attribute_groups[] = {
1654         &nd_device_attribute_group,
1655         &nd_namespace_attribute_group,
1656         &nd_numa_attribute_group,
1657         NULL,
1658 };
1659
1660 static const struct device_type namespace_io_device_type = {
1661         .name = "nd_namespace_io",
1662         .release = namespace_io_release,
1663         .groups = nd_namespace_attribute_groups,
1664 };
1665
1666 static const struct device_type namespace_pmem_device_type = {
1667         .name = "nd_namespace_pmem",
1668         .release = namespace_pmem_release,
1669         .groups = nd_namespace_attribute_groups,
1670 };
1671
1672 static const struct device_type namespace_blk_device_type = {
1673         .name = "nd_namespace_blk",
1674         .release = namespace_blk_release,
1675         .groups = nd_namespace_attribute_groups,
1676 };
1677
1678 static bool is_namespace_pmem(const struct device *dev)
1679 {
1680         return dev ? dev->type == &namespace_pmem_device_type : false;
1681 }
1682
1683 static bool is_namespace_blk(const struct device *dev)
1684 {
1685         return dev ? dev->type == &namespace_blk_device_type : false;
1686 }
1687
1688 static bool is_namespace_io(const struct device *dev)
1689 {
1690         return dev ? dev->type == &namespace_io_device_type : false;
1691 }
1692
1693 struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev)
1694 {
1695         struct nd_btt *nd_btt = is_nd_btt(dev) ? to_nd_btt(dev) : NULL;
1696         struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL;
1697         struct nd_dax *nd_dax = is_nd_dax(dev) ? to_nd_dax(dev) : NULL;
1698         struct nd_namespace_common *ndns = NULL;
1699         resource_size_t size;
1700
1701         if (nd_btt || nd_pfn || nd_dax) {
1702                 if (nd_btt)
1703                         ndns = nd_btt->ndns;
1704                 else if (nd_pfn)
1705                         ndns = nd_pfn->ndns;
1706                 else if (nd_dax)
1707                         ndns = nd_dax->nd_pfn.ndns;
1708
1709                 if (!ndns)
1710                         return ERR_PTR(-ENODEV);
1711
1712                 /*
1713                  * Flush any in-progess probes / removals in the driver
1714                  * for the raw personality of this namespace.
1715                  */
1716                 nd_device_lock(&ndns->dev);
1717                 nd_device_unlock(&ndns->dev);
1718                 if (ndns->dev.driver) {
1719                         dev_dbg(&ndns->dev, "is active, can't bind %s\n",
1720                                         dev_name(dev));
1721                         return ERR_PTR(-EBUSY);
1722                 }
1723                 if (dev_WARN_ONCE(&ndns->dev, ndns->claim != dev,
1724                                         "host (%s) vs claim (%s) mismatch\n",
1725                                         dev_name(dev),
1726                                         dev_name(ndns->claim)))
1727                         return ERR_PTR(-ENXIO);
1728         } else {
1729                 ndns = to_ndns(dev);
1730                 if (ndns->claim) {
1731                         dev_dbg(dev, "claimed by %s, failing probe\n",
1732                                 dev_name(ndns->claim));
1733
1734                         return ERR_PTR(-ENXIO);
1735                 }
1736         }
1737
1738         if (nvdimm_namespace_locked(ndns))
1739                 return ERR_PTR(-EACCES);
1740
1741         size = nvdimm_namespace_capacity(ndns);
1742         if (size < ND_MIN_NAMESPACE_SIZE) {
1743                 dev_dbg(&ndns->dev, "%pa, too small must be at least %#x\n",
1744                                 &size, ND_MIN_NAMESPACE_SIZE);
1745                 return ERR_PTR(-ENODEV);
1746         }
1747
1748         /*
1749          * Note, alignment validation for fsdax and devdax mode
1750          * namespaces happens in nd_pfn_validate() where infoblock
1751          * padding parameters can be applied.
1752          */
1753         if (pmem_should_map_pages(dev)) {
1754                 struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
1755                 struct resource *res = &nsio->res;
1756
1757                 if (!IS_ALIGNED(res->start | (res->end + 1),
1758                                         memremap_compat_align())) {
1759                         dev_err(&ndns->dev, "%pr misaligned, unable to map\n", res);
1760                         return ERR_PTR(-EOPNOTSUPP);
1761                 }
1762         }
1763
1764         if (is_namespace_pmem(&ndns->dev)) {
1765                 struct nd_namespace_pmem *nspm;
1766
1767                 nspm = to_nd_namespace_pmem(&ndns->dev);
1768                 if (uuid_not_set(nspm->uuid, &ndns->dev, __func__))
1769                         return ERR_PTR(-ENODEV);
1770         } else if (is_namespace_blk(&ndns->dev)) {
1771                 struct nd_namespace_blk *nsblk;
1772
1773                 nsblk = to_nd_namespace_blk(&ndns->dev);
1774                 if (uuid_not_set(nsblk->uuid, &ndns->dev, __func__))
1775                         return ERR_PTR(-ENODEV);
1776                 if (!nsblk->lbasize) {
1777                         dev_dbg(&ndns->dev, "sector size not set\n");
1778                         return ERR_PTR(-ENODEV);
1779                 }
1780                 if (!nd_namespace_blk_validate(nsblk))
1781                         return ERR_PTR(-ENODEV);
1782         }
1783
1784         return ndns;
1785 }
1786 EXPORT_SYMBOL(nvdimm_namespace_common_probe);
1787
1788 int devm_namespace_enable(struct device *dev, struct nd_namespace_common *ndns,
1789                 resource_size_t size)
1790 {
1791         if (is_namespace_blk(&ndns->dev))
1792                 return 0;
1793         return devm_nsio_enable(dev, to_nd_namespace_io(&ndns->dev), size);
1794 }
1795 EXPORT_SYMBOL_GPL(devm_namespace_enable);
1796
1797 void devm_namespace_disable(struct device *dev, struct nd_namespace_common *ndns)
1798 {
1799         if (is_namespace_blk(&ndns->dev))
1800                 return;
1801         devm_nsio_disable(dev, to_nd_namespace_io(&ndns->dev));
1802 }
1803 EXPORT_SYMBOL_GPL(devm_namespace_disable);
1804
1805 static struct device **create_namespace_io(struct nd_region *nd_region)
1806 {
1807         struct nd_namespace_io *nsio;
1808         struct device *dev, **devs;
1809         struct resource *res;
1810
1811         nsio = kzalloc(sizeof(*nsio), GFP_KERNEL);
1812         if (!nsio)
1813                 return NULL;
1814
1815         devs = kcalloc(2, sizeof(struct device *), GFP_KERNEL);
1816         if (!devs) {
1817                 kfree(nsio);
1818                 return NULL;
1819         }
1820
1821         dev = &nsio->common.dev;
1822         dev->type = &namespace_io_device_type;
1823         dev->parent = &nd_region->dev;
1824         res = &nsio->res;
1825         res->name = dev_name(&nd_region->dev);
1826         res->flags = IORESOURCE_MEM;
1827         res->start = nd_region->ndr_start;
1828         res->end = res->start + nd_region->ndr_size - 1;
1829
1830         devs[0] = dev;
1831         return devs;
1832 }
1833
1834 static bool has_uuid_at_pos(struct nd_region *nd_region, u8 *uuid,
1835                 u64 cookie, u16 pos)
1836 {
1837         struct nd_namespace_label *found = NULL;
1838         int i;
1839
1840         for (i = 0; i < nd_region->ndr_mappings; i++) {
1841                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1842                 struct nd_interleave_set *nd_set = nd_region->nd_set;
1843                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1844                 struct nd_label_ent *label_ent;
1845                 bool found_uuid = false;
1846
1847                 list_for_each_entry(label_ent, &nd_mapping->labels, list) {
1848                         struct nd_namespace_label *nd_label = label_ent->label;
1849                         u16 position, nlabel;
1850
1851                         if (!nd_label)
1852                                 continue;
1853                         position = nsl_get_position(ndd, nd_label);
1854                         nlabel = nsl_get_nlabel(ndd, nd_label);
1855
1856                         if (!nsl_validate_isetcookie(ndd, nd_label, cookie))
1857                                 continue;
1858
1859                         if (memcmp(nd_label->uuid, uuid, NSLABEL_UUID_LEN) != 0)
1860                                 continue;
1861
1862                         if (!nsl_validate_type_guid(ndd, nd_label,
1863                                                     &nd_set->type_guid))
1864                                 continue;
1865
1866                         if (found_uuid) {
1867                                 dev_dbg(ndd->dev, "duplicate entry for uuid\n");
1868                                 return false;
1869                         }
1870                         found_uuid = true;
1871                         if (nlabel != nd_region->ndr_mappings)
1872                                 continue;
1873                         if (position != pos)
1874                                 continue;
1875                         found = nd_label;
1876                         break;
1877                 }
1878                 if (found)
1879                         break;
1880         }
1881         return found != NULL;
1882 }
1883
1884 static int select_pmem_id(struct nd_region *nd_region, u8 *pmem_id)
1885 {
1886         int i;
1887
1888         if (!pmem_id)
1889                 return -ENODEV;
1890
1891         for (i = 0; i < nd_region->ndr_mappings; i++) {
1892                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1893                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1894                 struct nd_namespace_label *nd_label = NULL;
1895                 u64 hw_start, hw_end, pmem_start, pmem_end;
1896                 struct nd_label_ent *label_ent;
1897
1898                 lockdep_assert_held(&nd_mapping->lock);
1899                 list_for_each_entry(label_ent, &nd_mapping->labels, list) {
1900                         nd_label = label_ent->label;
1901                         if (!nd_label)
1902                                 continue;
1903                         if (memcmp(nd_label->uuid, pmem_id, NSLABEL_UUID_LEN) == 0)
1904                                 break;
1905                         nd_label = NULL;
1906                 }
1907
1908                 if (!nd_label) {
1909                         WARN_ON(1);
1910                         return -EINVAL;
1911                 }
1912
1913                 /*
1914                  * Check that this label is compliant with the dpa
1915                  * range published in NFIT
1916                  */
1917                 hw_start = nd_mapping->start;
1918                 hw_end = hw_start + nd_mapping->size;
1919                 pmem_start = nsl_get_dpa(ndd, nd_label);
1920                 pmem_end = pmem_start + nsl_get_rawsize(ndd, nd_label);
1921                 if (pmem_start >= hw_start && pmem_start < hw_end
1922                                 && pmem_end <= hw_end && pmem_end > hw_start)
1923                         /* pass */;
1924                 else {
1925                         dev_dbg(&nd_region->dev, "%s invalid label for %pUb\n",
1926                                         dev_name(ndd->dev), nd_label->uuid);
1927                         return -EINVAL;
1928                 }
1929
1930                 /* move recently validated label to the front of the list */
1931                 list_move(&label_ent->list, &nd_mapping->labels);
1932         }
1933         return 0;
1934 }
1935
1936 /**
1937  * create_namespace_pmem - validate interleave set labelling, retrieve label0
1938  * @nd_region: region with mappings to validate
1939  * @nspm: target namespace to create
1940  * @nd_label: target pmem namespace label to evaluate
1941  */
1942 static struct device *create_namespace_pmem(struct nd_region *nd_region,
1943                                             struct nd_mapping *nd_mapping,
1944                                             struct nd_namespace_label *nd_label)
1945 {
1946         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1947         struct nd_namespace_index *nsindex =
1948                 to_namespace_index(ndd, ndd->ns_current);
1949         u64 cookie = nd_region_interleave_set_cookie(nd_region, nsindex);
1950         u64 altcookie = nd_region_interleave_set_altcookie(nd_region);
1951         struct nd_label_ent *label_ent;
1952         struct nd_namespace_pmem *nspm;
1953         resource_size_t size = 0;
1954         struct resource *res;
1955         struct device *dev;
1956         int rc = 0;
1957         u16 i;
1958
1959         if (cookie == 0) {
1960                 dev_dbg(&nd_region->dev, "invalid interleave-set-cookie\n");
1961                 return ERR_PTR(-ENXIO);
1962         }
1963
1964         if (!nsl_validate_isetcookie(ndd, nd_label, cookie)) {
1965                 dev_dbg(&nd_region->dev, "invalid cookie in label: %pUb\n",
1966                                 nd_label->uuid);
1967                 if (!nsl_validate_isetcookie(ndd, nd_label, altcookie))
1968                         return ERR_PTR(-EAGAIN);
1969
1970                 dev_dbg(&nd_region->dev, "valid altcookie in label: %pUb\n",
1971                                 nd_label->uuid);
1972         }
1973
1974         nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
1975         if (!nspm)
1976                 return ERR_PTR(-ENOMEM);
1977
1978         nspm->id = -1;
1979         dev = &nspm->nsio.common.dev;
1980         dev->type = &namespace_pmem_device_type;
1981         dev->parent = &nd_region->dev;
1982         res = &nspm->nsio.res;
1983         res->name = dev_name(&nd_region->dev);
1984         res->flags = IORESOURCE_MEM;
1985
1986         for (i = 0; i < nd_region->ndr_mappings; i++) {
1987                 if (has_uuid_at_pos(nd_region, nd_label->uuid, cookie, i))
1988                         continue;
1989                 if (has_uuid_at_pos(nd_region, nd_label->uuid, altcookie, i))
1990                         continue;
1991                 break;
1992         }
1993
1994         if (i < nd_region->ndr_mappings) {
1995                 struct nvdimm *nvdimm = nd_region->mapping[i].nvdimm;
1996
1997                 /*
1998                  * Give up if we don't find an instance of a uuid at each
1999                  * position (from 0 to nd_region->ndr_mappings - 1), or if we
2000                  * find a dimm with two instances of the same uuid.
2001                  */
2002                 dev_err(&nd_region->dev, "%s missing label for %pUb\n",
2003                                 nvdimm_name(nvdimm), nd_label->uuid);
2004                 rc = -EINVAL;
2005                 goto err;
2006         }
2007
2008         /*
2009          * Fix up each mapping's 'labels' to have the validated pmem label for
2010          * that position at labels[0], and NULL at labels[1].  In the process,
2011          * check that the namespace aligns with interleave-set.  We know
2012          * that it does not overlap with any blk namespaces by virtue of
2013          * the dimm being enabled (i.e. nd_label_reserve_dpa()
2014          * succeeded).
2015          */
2016         rc = select_pmem_id(nd_region, nd_label->uuid);
2017         if (rc)
2018                 goto err;
2019
2020         /* Calculate total size and populate namespace properties from label0 */
2021         for (i = 0; i < nd_region->ndr_mappings; i++) {
2022                 struct nd_namespace_label *label0;
2023                 struct nvdimm_drvdata *ndd;
2024
2025                 nd_mapping = &nd_region->mapping[i];
2026                 label_ent = list_first_entry_or_null(&nd_mapping->labels,
2027                                 typeof(*label_ent), list);
2028                 label0 = label_ent ? label_ent->label : NULL;
2029
2030                 if (!label0) {
2031                         WARN_ON(1);
2032                         continue;
2033                 }
2034
2035                 ndd = to_ndd(nd_mapping);
2036                 size += nsl_get_rawsize(ndd, label0);
2037                 if (nsl_get_position(ndd, label0) != 0)
2038                         continue;
2039                 WARN_ON(nspm->alt_name || nspm->uuid);
2040                 nspm->alt_name = kmemdup(nsl_ref_name(ndd, label0),
2041                                          NSLABEL_NAME_LEN, GFP_KERNEL);
2042                 nspm->uuid = kmemdup((void __force *) label0->uuid,
2043                                 NSLABEL_UUID_LEN, GFP_KERNEL);
2044                 nspm->lbasize = nsl_get_lbasize(ndd, label0);
2045                 nspm->nsio.common.claim_class =
2046                         nsl_get_claim_class(ndd, label0);
2047         }
2048
2049         if (!nspm->alt_name || !nspm->uuid) {
2050                 rc = -ENOMEM;
2051                 goto err;
2052         }
2053
2054         nd_namespace_pmem_set_resource(nd_region, nspm, size);
2055
2056         return dev;
2057  err:
2058         namespace_pmem_release(dev);
2059         switch (rc) {
2060         case -EINVAL:
2061                 dev_dbg(&nd_region->dev, "invalid label(s)\n");
2062                 break;
2063         case -ENODEV:
2064                 dev_dbg(&nd_region->dev, "label not found\n");
2065                 break;
2066         default:
2067                 dev_dbg(&nd_region->dev, "unexpected err: %d\n", rc);
2068                 break;
2069         }
2070         return ERR_PTR(rc);
2071 }
2072
2073 struct resource *nsblk_add_resource(struct nd_region *nd_region,
2074                 struct nvdimm_drvdata *ndd, struct nd_namespace_blk *nsblk,
2075                 resource_size_t start)
2076 {
2077         struct nd_label_id label_id;
2078         struct resource *res;
2079
2080         nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
2081         res = krealloc(nsblk->res,
2082                         sizeof(void *) * (nsblk->num_resources + 1),
2083                         GFP_KERNEL);
2084         if (!res)
2085                 return NULL;
2086         nsblk->res = (struct resource **) res;
2087         for_each_dpa_resource(ndd, res)
2088                 if (strcmp(res->name, label_id.id) == 0
2089                                 && res->start == start) {
2090                         nsblk->res[nsblk->num_resources++] = res;
2091                         return res;
2092                 }
2093         return NULL;
2094 }
2095
2096 static struct device *nd_namespace_blk_create(struct nd_region *nd_region)
2097 {
2098         struct nd_namespace_blk *nsblk;
2099         struct device *dev;
2100
2101         if (!is_nd_blk(&nd_region->dev))
2102                 return NULL;
2103
2104         nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
2105         if (!nsblk)
2106                 return NULL;
2107
2108         dev = &nsblk->common.dev;
2109         dev->type = &namespace_blk_device_type;
2110         nsblk->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL);
2111         if (nsblk->id < 0) {
2112                 kfree(nsblk);
2113                 return NULL;
2114         }
2115         dev_set_name(dev, "namespace%d.%d", nd_region->id, nsblk->id);
2116         dev->parent = &nd_region->dev;
2117
2118         return &nsblk->common.dev;
2119 }
2120
2121 static struct device *nd_namespace_pmem_create(struct nd_region *nd_region)
2122 {
2123         struct nd_namespace_pmem *nspm;
2124         struct resource *res;
2125         struct device *dev;
2126
2127         if (!is_memory(&nd_region->dev))
2128                 return NULL;
2129
2130         nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
2131         if (!nspm)
2132                 return NULL;
2133
2134         dev = &nspm->nsio.common.dev;
2135         dev->type = &namespace_pmem_device_type;
2136         dev->parent = &nd_region->dev;
2137         res = &nspm->nsio.res;
2138         res->name = dev_name(&nd_region->dev);
2139         res->flags = IORESOURCE_MEM;
2140
2141         nspm->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL);
2142         if (nspm->id < 0) {
2143                 kfree(nspm);
2144                 return NULL;
2145         }
2146         dev_set_name(dev, "namespace%d.%d", nd_region->id, nspm->id);
2147         nd_namespace_pmem_set_resource(nd_region, nspm, 0);
2148
2149         return dev;
2150 }
2151
2152 void nd_region_create_ns_seed(struct nd_region *nd_region)
2153 {
2154         WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2155
2156         if (nd_region_to_nstype(nd_region) == ND_DEVICE_NAMESPACE_IO)
2157                 return;
2158
2159         if (is_nd_blk(&nd_region->dev))
2160                 nd_region->ns_seed = nd_namespace_blk_create(nd_region);
2161         else
2162                 nd_region->ns_seed = nd_namespace_pmem_create(nd_region);
2163
2164         /*
2165          * Seed creation failures are not fatal, provisioning is simply
2166          * disabled until memory becomes available
2167          */
2168         if (!nd_region->ns_seed)
2169                 dev_err(&nd_region->dev, "failed to create %s namespace\n",
2170                                 is_nd_blk(&nd_region->dev) ? "blk" : "pmem");
2171         else
2172                 nd_device_register(nd_region->ns_seed);
2173 }
2174
2175 void nd_region_create_dax_seed(struct nd_region *nd_region)
2176 {
2177         WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2178         nd_region->dax_seed = nd_dax_create(nd_region);
2179         /*
2180          * Seed creation failures are not fatal, provisioning is simply
2181          * disabled until memory becomes available
2182          */
2183         if (!nd_region->dax_seed)
2184                 dev_err(&nd_region->dev, "failed to create dax namespace\n");
2185 }
2186
2187 void nd_region_create_pfn_seed(struct nd_region *nd_region)
2188 {
2189         WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2190         nd_region->pfn_seed = nd_pfn_create(nd_region);
2191         /*
2192          * Seed creation failures are not fatal, provisioning is simply
2193          * disabled until memory becomes available
2194          */
2195         if (!nd_region->pfn_seed)
2196                 dev_err(&nd_region->dev, "failed to create pfn namespace\n");
2197 }
2198
2199 void nd_region_create_btt_seed(struct nd_region *nd_region)
2200 {
2201         WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2202         nd_region->btt_seed = nd_btt_create(nd_region);
2203         /*
2204          * Seed creation failures are not fatal, provisioning is simply
2205          * disabled until memory becomes available
2206          */
2207         if (!nd_region->btt_seed)
2208                 dev_err(&nd_region->dev, "failed to create btt namespace\n");
2209 }
2210
2211 static int add_namespace_resource(struct nd_region *nd_region,
2212                 struct nd_namespace_label *nd_label, struct device **devs,
2213                 int count)
2214 {
2215         struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2216         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2217         int i;
2218
2219         for (i = 0; i < count; i++) {
2220                 u8 *uuid = namespace_to_uuid(devs[i]);
2221                 struct resource *res;
2222
2223                 if (IS_ERR_OR_NULL(uuid)) {
2224                         WARN_ON(1);
2225                         continue;
2226                 }
2227
2228                 if (memcmp(uuid, nd_label->uuid, NSLABEL_UUID_LEN) != 0)
2229                         continue;
2230                 if (is_namespace_blk(devs[i])) {
2231                         res = nsblk_add_resource(nd_region, ndd,
2232                                         to_nd_namespace_blk(devs[i]),
2233                                         nsl_get_dpa(ndd, nd_label));
2234                         if (!res)
2235                                 return -ENXIO;
2236                         nd_dbg_dpa(nd_region, ndd, res, "%d assign\n", count);
2237                 } else {
2238                         dev_err(&nd_region->dev,
2239                                         "error: conflicting extents for uuid: %pUb\n",
2240                                         nd_label->uuid);
2241                         return -ENXIO;
2242                 }
2243                 break;
2244         }
2245
2246         return i;
2247 }
2248
2249 static struct device *create_namespace_blk(struct nd_region *nd_region,
2250                 struct nd_namespace_label *nd_label, int count)
2251 {
2252
2253         struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2254         struct nd_interleave_set *nd_set = nd_region->nd_set;
2255         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2256         struct nd_namespace_blk *nsblk;
2257         char name[NSLABEL_NAME_LEN];
2258         struct device *dev = NULL;
2259         struct resource *res;
2260
2261         if (!nsl_validate_type_guid(ndd, nd_label, &nd_set->type_guid))
2262                 return ERR_PTR(-EAGAIN);
2263         if (!nsl_validate_blk_isetcookie(ndd, nd_label, nd_set->cookie2))
2264                 return ERR_PTR(-EAGAIN);
2265
2266         nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
2267         if (!nsblk)
2268                 return ERR_PTR(-ENOMEM);
2269         dev = &nsblk->common.dev;
2270         dev->type = &namespace_blk_device_type;
2271         dev->parent = &nd_region->dev;
2272         nsblk->id = -1;
2273         nsblk->lbasize = nsl_get_lbasize(ndd, nd_label);
2274         nsblk->uuid = kmemdup(nd_label->uuid, NSLABEL_UUID_LEN, GFP_KERNEL);
2275         nsblk->common.claim_class = nsl_get_claim_class(ndd, nd_label);
2276         if (!nsblk->uuid)
2277                 goto blk_err;
2278         nsl_get_name(ndd, nd_label, name);
2279         if (name[0]) {
2280                 nsblk->alt_name = kmemdup(name, NSLABEL_NAME_LEN, GFP_KERNEL);
2281                 if (!nsblk->alt_name)
2282                         goto blk_err;
2283         }
2284         res = nsblk_add_resource(nd_region, ndd, nsblk,
2285                         nsl_get_dpa(ndd, nd_label));
2286         if (!res)
2287                 goto blk_err;
2288         nd_dbg_dpa(nd_region, ndd, res, "%d: assign\n", count);
2289         return dev;
2290  blk_err:
2291         namespace_blk_release(dev);
2292         return ERR_PTR(-ENXIO);
2293 }
2294
2295 static int cmp_dpa(const void *a, const void *b)
2296 {
2297         const struct device *dev_a = *(const struct device **) a;
2298         const struct device *dev_b = *(const struct device **) b;
2299         struct nd_namespace_blk *nsblk_a, *nsblk_b;
2300         struct nd_namespace_pmem *nspm_a, *nspm_b;
2301
2302         if (is_namespace_io(dev_a))
2303                 return 0;
2304
2305         if (is_namespace_blk(dev_a)) {
2306                 nsblk_a = to_nd_namespace_blk(dev_a);
2307                 nsblk_b = to_nd_namespace_blk(dev_b);
2308
2309                 return memcmp(&nsblk_a->res[0]->start, &nsblk_b->res[0]->start,
2310                                 sizeof(resource_size_t));
2311         }
2312
2313         nspm_a = to_nd_namespace_pmem(dev_a);
2314         nspm_b = to_nd_namespace_pmem(dev_b);
2315
2316         return memcmp(&nspm_a->nsio.res.start, &nspm_b->nsio.res.start,
2317                         sizeof(resource_size_t));
2318 }
2319
2320 static struct device **scan_labels(struct nd_region *nd_region)
2321 {
2322         int i, count = 0;
2323         struct device *dev, **devs = NULL;
2324         struct nd_label_ent *label_ent, *e;
2325         struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2326         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2327         resource_size_t map_end = nd_mapping->start + nd_mapping->size - 1;
2328
2329         /* "safe" because create_namespace_pmem() might list_move() label_ent */
2330         list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) {
2331                 struct nd_namespace_label *nd_label = label_ent->label;
2332                 struct device **__devs;
2333                 u32 flags;
2334
2335                 if (!nd_label)
2336                         continue;
2337                 flags = nsl_get_flags(ndd, nd_label);
2338                 if (is_nd_blk(&nd_region->dev)
2339                                 == !!(flags & NSLABEL_FLAG_LOCAL))
2340                         /* pass, region matches label type */;
2341                 else
2342                         continue;
2343
2344                 /* skip labels that describe extents outside of the region */
2345                 if (nsl_get_dpa(ndd, nd_label) < nd_mapping->start ||
2346                     nsl_get_dpa(ndd, nd_label) > map_end)
2347                         continue;
2348
2349                 i = add_namespace_resource(nd_region, nd_label, devs, count);
2350                 if (i < 0)
2351                         goto err;
2352                 if (i < count)
2353                         continue;
2354                 __devs = kcalloc(count + 2, sizeof(dev), GFP_KERNEL);
2355                 if (!__devs)
2356                         goto err;
2357                 memcpy(__devs, devs, sizeof(dev) * count);
2358                 kfree(devs);
2359                 devs = __devs;
2360
2361                 if (is_nd_blk(&nd_region->dev))
2362                         dev = create_namespace_blk(nd_region, nd_label, count);
2363                 else
2364                         dev = create_namespace_pmem(nd_region, nd_mapping,
2365                                                     nd_label);
2366
2367                 if (IS_ERR(dev)) {
2368                         switch (PTR_ERR(dev)) {
2369                         case -EAGAIN:
2370                                 /* skip invalid labels */
2371                                 continue;
2372                         case -ENODEV:
2373                                 /* fallthrough to seed creation */
2374                                 break;
2375                         default:
2376                                 goto err;
2377                         }
2378                 } else
2379                         devs[count++] = dev;
2380
2381         }
2382
2383         dev_dbg(&nd_region->dev, "discovered %d %s namespace%s\n",
2384                         count, is_nd_blk(&nd_region->dev)
2385                         ? "blk" : "pmem", count == 1 ? "" : "s");
2386
2387         if (count == 0) {
2388                 /* Publish a zero-sized namespace for userspace to configure. */
2389                 nd_mapping_free_labels(nd_mapping);
2390
2391                 devs = kcalloc(2, sizeof(dev), GFP_KERNEL);
2392                 if (!devs)
2393                         goto err;
2394                 if (is_nd_blk(&nd_region->dev)) {
2395                         struct nd_namespace_blk *nsblk;
2396
2397                         nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
2398                         if (!nsblk)
2399                                 goto err;
2400                         dev = &nsblk->common.dev;
2401                         dev->type = &namespace_blk_device_type;
2402                 } else {
2403                         struct nd_namespace_pmem *nspm;
2404
2405                         nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
2406                         if (!nspm)
2407                                 goto err;
2408                         dev = &nspm->nsio.common.dev;
2409                         dev->type = &namespace_pmem_device_type;
2410                         nd_namespace_pmem_set_resource(nd_region, nspm, 0);
2411                 }
2412                 dev->parent = &nd_region->dev;
2413                 devs[count++] = dev;
2414         } else if (is_memory(&nd_region->dev)) {
2415                 /* clean unselected labels */
2416                 for (i = 0; i < nd_region->ndr_mappings; i++) {
2417                         struct list_head *l, *e;
2418                         LIST_HEAD(list);
2419                         int j;
2420
2421                         nd_mapping = &nd_region->mapping[i];
2422                         if (list_empty(&nd_mapping->labels)) {
2423                                 WARN_ON(1);
2424                                 continue;
2425                         }
2426
2427                         j = count;
2428                         list_for_each_safe(l, e, &nd_mapping->labels) {
2429                                 if (!j--)
2430                                         break;
2431                                 list_move_tail(l, &list);
2432                         }
2433                         nd_mapping_free_labels(nd_mapping);
2434                         list_splice_init(&list, &nd_mapping->labels);
2435                 }
2436         }
2437
2438         if (count > 1)
2439                 sort(devs, count, sizeof(struct device *), cmp_dpa, NULL);
2440
2441         return devs;
2442
2443  err:
2444         if (devs) {
2445                 for (i = 0; devs[i]; i++)
2446                         if (is_nd_blk(&nd_region->dev))
2447                                 namespace_blk_release(devs[i]);
2448                         else
2449                                 namespace_pmem_release(devs[i]);
2450                 kfree(devs);
2451         }
2452         return NULL;
2453 }
2454
2455 static struct device **create_namespaces(struct nd_region *nd_region)
2456 {
2457         struct nd_mapping *nd_mapping;
2458         struct device **devs;
2459         int i;
2460
2461         if (nd_region->ndr_mappings == 0)
2462                 return NULL;
2463
2464         /* lock down all mappings while we scan labels */
2465         for (i = 0; i < nd_region->ndr_mappings; i++) {
2466                 nd_mapping = &nd_region->mapping[i];
2467                 mutex_lock_nested(&nd_mapping->lock, i);
2468         }
2469
2470         devs = scan_labels(nd_region);
2471
2472         for (i = 0; i < nd_region->ndr_mappings; i++) {
2473                 int reverse = nd_region->ndr_mappings - 1 - i;
2474
2475                 nd_mapping = &nd_region->mapping[reverse];
2476                 mutex_unlock(&nd_mapping->lock);
2477         }
2478
2479         return devs;
2480 }
2481
2482 static void deactivate_labels(void *region)
2483 {
2484         struct nd_region *nd_region = region;
2485         int i;
2486
2487         for (i = 0; i < nd_region->ndr_mappings; i++) {
2488                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
2489                 struct nvdimm_drvdata *ndd = nd_mapping->ndd;
2490                 struct nvdimm *nvdimm = nd_mapping->nvdimm;
2491
2492                 mutex_lock(&nd_mapping->lock);
2493                 nd_mapping_free_labels(nd_mapping);
2494                 mutex_unlock(&nd_mapping->lock);
2495
2496                 put_ndd(ndd);
2497                 nd_mapping->ndd = NULL;
2498                 if (ndd)
2499                         atomic_dec(&nvdimm->busy);
2500         }
2501 }
2502
2503 static int init_active_labels(struct nd_region *nd_region)
2504 {
2505         int i, rc = 0;
2506
2507         for (i = 0; i < nd_region->ndr_mappings; i++) {
2508                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
2509                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2510                 struct nvdimm *nvdimm = nd_mapping->nvdimm;
2511                 struct nd_label_ent *label_ent;
2512                 int count, j;
2513
2514                 /*
2515                  * If the dimm is disabled then we may need to prevent
2516                  * the region from being activated.
2517                  */
2518                 if (!ndd) {
2519                         if (test_bit(NDD_LOCKED, &nvdimm->flags))
2520                                 /* fail, label data may be unreadable */;
2521                         else if (test_bit(NDD_LABELING, &nvdimm->flags))
2522                                 /* fail, labels needed to disambiguate dpa */;
2523                         else
2524                                 continue;
2525
2526                         dev_err(&nd_region->dev, "%s: is %s, failing probe\n",
2527                                         dev_name(&nd_mapping->nvdimm->dev),
2528                                         test_bit(NDD_LOCKED, &nvdimm->flags)
2529                                         ? "locked" : "disabled");
2530                         rc = -ENXIO;
2531                         goto out;
2532                 }
2533                 nd_mapping->ndd = ndd;
2534                 atomic_inc(&nvdimm->busy);
2535                 get_ndd(ndd);
2536
2537                 count = nd_label_active_count(ndd);
2538                 dev_dbg(ndd->dev, "count: %d\n", count);
2539                 if (!count)
2540                         continue;
2541                 for (j = 0; j < count; j++) {
2542                         struct nd_namespace_label *label;
2543
2544                         label_ent = kzalloc(sizeof(*label_ent), GFP_KERNEL);
2545                         if (!label_ent)
2546                                 break;
2547                         label = nd_label_active(ndd, j);
2548                         if (test_bit(NDD_NOBLK, &nvdimm->flags)) {
2549                                 u32 flags = nsl_get_flags(ndd, label);
2550
2551                                 flags &= ~NSLABEL_FLAG_LOCAL;
2552                                 nsl_set_flags(ndd, label, flags);
2553                         }
2554                         label_ent->label = label;
2555
2556                         mutex_lock(&nd_mapping->lock);
2557                         list_add_tail(&label_ent->list, &nd_mapping->labels);
2558                         mutex_unlock(&nd_mapping->lock);
2559                 }
2560
2561                 if (j < count)
2562                         break;
2563         }
2564
2565         if (i < nd_region->ndr_mappings)
2566                 rc = -ENOMEM;
2567
2568 out:
2569         if (rc) {
2570                 deactivate_labels(nd_region);
2571                 return rc;
2572         }
2573
2574         return devm_add_action_or_reset(&nd_region->dev, deactivate_labels,
2575                                         nd_region);
2576 }
2577
2578 int nd_region_register_namespaces(struct nd_region *nd_region, int *err)
2579 {
2580         struct device **devs = NULL;
2581         int i, rc = 0, type;
2582
2583         *err = 0;
2584         nvdimm_bus_lock(&nd_region->dev);
2585         rc = init_active_labels(nd_region);
2586         if (rc) {
2587                 nvdimm_bus_unlock(&nd_region->dev);
2588                 return rc;
2589         }
2590
2591         type = nd_region_to_nstype(nd_region);
2592         switch (type) {
2593         case ND_DEVICE_NAMESPACE_IO:
2594                 devs = create_namespace_io(nd_region);
2595                 break;
2596         case ND_DEVICE_NAMESPACE_PMEM:
2597         case ND_DEVICE_NAMESPACE_BLK:
2598                 devs = create_namespaces(nd_region);
2599                 break;
2600         default:
2601                 break;
2602         }
2603         nvdimm_bus_unlock(&nd_region->dev);
2604
2605         if (!devs)
2606                 return -ENODEV;
2607
2608         for (i = 0; devs[i]; i++) {
2609                 struct device *dev = devs[i];
2610                 int id;
2611
2612                 if (type == ND_DEVICE_NAMESPACE_BLK) {
2613                         struct nd_namespace_blk *nsblk;
2614
2615                         nsblk = to_nd_namespace_blk(dev);
2616                         id = ida_simple_get(&nd_region->ns_ida, 0, 0,
2617                                         GFP_KERNEL);
2618                         nsblk->id = id;
2619                 } else if (type == ND_DEVICE_NAMESPACE_PMEM) {
2620                         struct nd_namespace_pmem *nspm;
2621
2622                         nspm = to_nd_namespace_pmem(dev);
2623                         id = ida_simple_get(&nd_region->ns_ida, 0, 0,
2624                                         GFP_KERNEL);
2625                         nspm->id = id;
2626                 } else
2627                         id = i;
2628
2629                 if (id < 0)
2630                         break;
2631                 dev_set_name(dev, "namespace%d.%d", nd_region->id, id);
2632                 nd_device_register(dev);
2633         }
2634         if (i)
2635                 nd_region->ns_seed = devs[0];
2636
2637         if (devs[i]) {
2638                 int j;
2639
2640                 for (j = i; devs[j]; j++) {
2641                         struct device *dev = devs[j];
2642
2643                         device_initialize(dev);
2644                         put_device(dev);
2645                 }
2646                 *err = j - i;
2647                 /*
2648                  * All of the namespaces we tried to register failed, so
2649                  * fail region activation.
2650                  */
2651                 if (*err == 0)
2652                         rc = -ENODEV;
2653         }
2654         kfree(devs);
2655
2656         if (rc == -ENODEV)
2657                 return rc;
2658
2659         return i;
2660 }