drivers/nvdimm/namespace_devs.c

   1 /*
   2  * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  */
  13 #include <linux/module.h>
  14 #include <linux/device.h>
  15 #include <linux/sort.h>
  16 #include <linux/slab.h>
  17 #include <linux/list.h>
  18 #include <linux/nd.h>
  19 #include "nd-core.h"
  20 #include "pmem.h"
  21 #include "nd.h"
  22
  23 static void namespace_io_release(struct device *dev)
  24 {
  25         struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
  26
  27         kfree(nsio);
  28 }
  29
  30 static void namespace_pmem_release(struct device *dev)
  31 {
  32         struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
  33         struct nd_region *nd_region = to_nd_region(dev->parent);
  34
  35         if (nspm->id >= 0)
  36                 ida_simple_remove(&nd_region->ns_ida, nspm->id);
  37         kfree(nspm->alt_name);
  38         kfree(nspm->uuid);
  39         kfree(nspm);
  40 }
  41
  42 static void namespace_blk_release(struct device *dev)
  43 {
  44         struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
  45         struct nd_region *nd_region = to_nd_region(dev->parent);
  46
  47         if (nsblk->id >= 0)
  48                 ida_simple_remove(&nd_region->ns_ida, nsblk->id);
  49         kfree(nsblk->alt_name);
  50         kfree(nsblk->uuid);
  51         kfree(nsblk->res);
  52         kfree(nsblk);
  53 }
  54
  55 static const struct device_type namespace_io_device_type = {
  56         .name = "nd_namespace_io",
  57         .release = namespace_io_release,
  58 };
  59
  60 static const struct device_type namespace_pmem_device_type = {
  61         .name = "nd_namespace_pmem",
  62         .release = namespace_pmem_release,
  63 };
  64
  65 static const struct device_type namespace_blk_device_type = {
  66         .name = "nd_namespace_blk",
  67         .release = namespace_blk_release,
  68 };
  69
  70 static bool is_namespace_pmem(const struct device *dev)
  71 {
  72         return dev ? dev->type == &namespace_pmem_device_type : false;
  73 }
  74
  75 static bool is_namespace_blk(const struct device *dev)
  76 {
  77         return dev ? dev->type == &namespace_blk_device_type : false;
  78 }
  79
  80 static bool is_namespace_io(const struct device *dev)
  81 {
  82         return dev ? dev->type == &namespace_io_device_type : false;
  83 }
  84
  85 static int is_uuid_busy(struct device *dev, void *data)
  86 {
  87         u8 *uuid1 = data, *uuid2 = NULL;
  88
  89         if (is_namespace_pmem(dev)) {
  90                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
  91
  92                 uuid2 = nspm->uuid;
  93         } else if (is_namespace_blk(dev)) {
  94                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
  95
  96                 uuid2 = nsblk->uuid;
  97         } else if (is_nd_btt(dev)) {
  98                 struct nd_btt *nd_btt = to_nd_btt(dev);
  99
 100                 uuid2 = nd_btt->uuid;
 101         } else if (is_nd_pfn(dev)) {
 102                 struct nd_pfn *nd_pfn = to_nd_pfn(dev);
 103
 104                 uuid2 = nd_pfn->uuid;
 105         }
 106
 107         if (uuid2 && memcmp(uuid1, uuid2, NSLABEL_UUID_LEN) == 0)
 108                 return -EBUSY;
 109
 110         return 0;
 111 }
 112
 113 static int is_namespace_uuid_busy(struct device *dev, void *data)
 114 {
 115         if (is_nd_region(dev))
 116                 return device_for_each_child(dev, data, is_uuid_busy);
 117         return 0;
 118 }
 119
 120 /**
 121  * nd_is_uuid_unique - verify that no other namespace has @uuid
 122  * @dev: any device on a nvdimm_bus
 123  * @uuid: uuid to check
 124  */
 125 bool nd_is_uuid_unique(struct device *dev, u8 *uuid)
 126 {
 127         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
 128
 129         if (!nvdimm_bus)
 130                 return false;
 131         WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm_bus->dev));
 132         if (device_for_each_child(&nvdimm_bus->dev, uuid,
 133                                 is_namespace_uuid_busy) != 0)
 134                 return false;
 135         return true;
 136 }
 137
 138 bool pmem_should_map_pages(struct device *dev)
 139 {
 140         struct nd_region *nd_region = to_nd_region(dev->parent);
 141         struct nd_namespace_io *nsio;
 142
 143         if (!IS_ENABLED(CONFIG_ZONE_DEVICE))
 144                 return false;
 145
 146         if (!test_bit(ND_REGION_PAGEMAP, &nd_region->flags))
 147                 return false;
 148
 149         if (is_nd_pfn(dev) || is_nd_btt(dev))
 150                 return false;
 151
 152         nsio = to_nd_namespace_io(dev);
 153         if (region_intersects(nsio->res.start, resource_size(&nsio->res),
 154                                 IORESOURCE_SYSTEM_RAM,
 155                                 IORES_DESC_NONE) == REGION_MIXED)
 156                 return false;
 157
 158         return ARCH_MEMREMAP_PMEM == MEMREMAP_WB;
 159 }
 160 EXPORT_SYMBOL(pmem_should_map_pages);
 161
 162 unsigned int pmem_sector_size(struct nd_namespace_common *ndns)
 163 {
 164         if (is_namespace_pmem(&ndns->dev)) {
 165                 struct nd_namespace_pmem *nspm;
 166
 167                 nspm = to_nd_namespace_pmem(&ndns->dev);
 168                 if (nspm->lbasize == 0 || nspm->lbasize == 512)
 169                         /* default */;
 170                 else if (nspm->lbasize == 4096)
 171                         return 4096;
 172                 else
 173                         dev_WARN(&ndns->dev, "unsupported sector size: %ld\n",
 174                                         nspm->lbasize);
 175         }
 176
 177         /*
 178          * There is no namespace label (is_namespace_io()), or the label
 179          * indicates the default sector size.
 180          */
 181         return 512;
 182 }
 183 EXPORT_SYMBOL(pmem_sector_size);
 184
 185 const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
 186                 char *name)
 187 {
 188         struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
 189         const char *suffix = NULL;
 190
 191         if (ndns->claim && is_nd_btt(ndns->claim))
 192                 suffix = "s";
 193
 194         if (is_namespace_pmem(&ndns->dev) || is_namespace_io(&ndns->dev)) {
 195                 int nsidx = 0;
 196
 197                 if (is_namespace_pmem(&ndns->dev)) {
 198                         struct nd_namespace_pmem *nspm;
 199
 200                         nspm = to_nd_namespace_pmem(&ndns->dev);
 201                         nsidx = nspm->id;
 202                 }
 203
 204                 if (nsidx)
 205                         sprintf(name, "pmem%d.%d%s", nd_region->id, nsidx,
 206                                         suffix ? suffix : "");
 207                 else
 208                         sprintf(name, "pmem%d%s", nd_region->id,
 209                                         suffix ? suffix : "");
 210         } else if (is_namespace_blk(&ndns->dev)) {
 211                 struct nd_namespace_blk *nsblk;
 212
 213                 nsblk = to_nd_namespace_blk(&ndns->dev);
 214                 sprintf(name, "ndblk%d.%d%s", nd_region->id, nsblk->id,
 215                                 suffix ? suffix : "");
 216         } else {
 217                 return NULL;
 218         }
 219
 220         return name;
 221 }
 222 EXPORT_SYMBOL(nvdimm_namespace_disk_name);
 223
 224 const u8 *nd_dev_to_uuid(struct device *dev)
 225 {
 226         static const u8 null_uuid[16];
 227
 228         if (!dev)
 229                 return null_uuid;
 230
 231         if (is_namespace_pmem(dev)) {
 232                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
 233
 234                 return nspm->uuid;
 235         } else if (is_namespace_blk(dev)) {
 236                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 237
 238                 return nsblk->uuid;
 239         } else
 240                 return null_uuid;
 241 }
 242 EXPORT_SYMBOL(nd_dev_to_uuid);
 243
 244 static ssize_t nstype_show(struct device *dev,
 245                 struct device_attribute *attr, char *buf)
 246 {
 247         struct nd_region *nd_region = to_nd_region(dev->parent);
 248
 249         return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region));
 250 }
 251 static DEVICE_ATTR_RO(nstype);
 252
 253 static ssize_t __alt_name_store(struct device *dev, const char *buf,
 254                 const size_t len)
 255 {
 256         char *input, *pos, *alt_name, **ns_altname;
 257         ssize_t rc;
 258
 259         if (is_namespace_pmem(dev)) {
 260                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
 261
 262                 ns_altname = &nspm->alt_name;
 263         } else if (is_namespace_blk(dev)) {
 264                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 265
 266                 ns_altname = &nsblk->alt_name;
 267         } else
 268                 return -ENXIO;
 269
 270         if (dev->driver || to_ndns(dev)->claim)
 271                 return -EBUSY;
 272
 273         input = kmemdup(buf, len + 1, GFP_KERNEL);
 274         if (!input)
 275                 return -ENOMEM;
 276
 277         input[len] = '\0';
 278         pos = strim(input);
 279         if (strlen(pos) + 1 > NSLABEL_NAME_LEN) {
 280                 rc = -EINVAL;
 281                 goto out;
 282         }
 283
 284         alt_name = kzalloc(NSLABEL_NAME_LEN, GFP_KERNEL);
 285         if (!alt_name) {
 286                 rc = -ENOMEM;
 287                 goto out;
 288         }
 289         kfree(*ns_altname);
 290         *ns_altname = alt_name;
 291         sprintf(*ns_altname, "%s", pos);
 292         rc = len;
 293
 294 out:
 295         kfree(input);
 296         return rc;
 297 }
 298
 299 static resource_size_t nd_namespace_blk_size(struct nd_namespace_blk *nsblk)
 300 {
 301         struct nd_region *nd_region = to_nd_region(nsblk->common.dev.parent);
 302         struct nd_mapping *nd_mapping = &nd_region->mapping[0];
 303         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 304         struct nd_label_id label_id;
 305         resource_size_t size = 0;
 306         struct resource *res;
 307
 308         if (!nsblk->uuid)
 309                 return 0;
 310         nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
 311         for_each_dpa_resource(ndd, res)
 312                 if (strcmp(res->name, label_id.id) == 0)
 313                         size += resource_size(res);
 314         return size;
 315 }
 316
 317 static bool __nd_namespace_blk_validate(struct nd_namespace_blk *nsblk)
 318 {
 319         struct nd_region *nd_region = to_nd_region(nsblk->common.dev.parent);
 320         struct nd_mapping *nd_mapping = &nd_region->mapping[0];
 321         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 322         struct nd_label_id label_id;
 323         struct resource *res;
 324         int count, i;
 325
 326         if (!nsblk->uuid || !nsblk->lbasize || !ndd)
 327                 return false;
 328
 329         count = 0;
 330         nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
 331         for_each_dpa_resource(ndd, res) {
 332                 if (strcmp(res->name, label_id.id) != 0)
 333                         continue;
 334                 /*
 335                  * Resources with unacknowledged adjustments indicate a
 336                  * failure to update labels
 337                  */
 338                 if (res->flags & DPA_RESOURCE_ADJUSTED)
 339                         return false;
 340                 count++;
 341         }
 342
 343         /* These values match after a successful label update */
 344         if (count != nsblk->num_resources)
 345                 return false;
 346
 347         for (i = 0; i < nsblk->num_resources; i++) {
 348                 struct resource *found = NULL;
 349
 350                 for_each_dpa_resource(ndd, res)
 351                         if (res == nsblk->res[i]) {
 352                                 found = res;
 353                                 break;
 354                         }
 355                 /* stale resource */
 356                 if (!found)
 357                         return false;
 358         }
 359
 360         return true;
 361 }
 362
 363 resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk)
 364 {
 365         resource_size_t size;
 366
 367         nvdimm_bus_lock(&nsblk->common.dev);
 368         size = __nd_namespace_blk_validate(nsblk);
 369         nvdimm_bus_unlock(&nsblk->common.dev);
 370
 371         return size;
 372 }
 373 EXPORT_SYMBOL(nd_namespace_blk_validate);
 374
 375
 376 static int nd_namespace_label_update(struct nd_region *nd_region,
 377                 struct device *dev)
 378 {
 379         dev_WARN_ONCE(dev, dev->driver || to_ndns(dev)->claim,
 380                         "namespace must be idle during label update\n");
 381         if (dev->driver || to_ndns(dev)->claim)
 382                 return 0;
 383
 384         /*
 385          * Only allow label writes that will result in a valid namespace
 386          * or deletion of an existing namespace.
 387          */
 388         if (is_namespace_pmem(dev)) {
 389                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
 390                 resource_size_t size = resource_size(&nspm->nsio.res);
 391
 392                 if (size == 0 && nspm->uuid)
 393                         /* delete allocation */;
 394                 else if (!nspm->uuid)
 395                         return 0;
 396
 397                 return nd_pmem_namespace_label_update(nd_region, nspm, size);
 398         } else if (is_namespace_blk(dev)) {
 399                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 400                 resource_size_t size = nd_namespace_blk_size(nsblk);
 401
 402                 if (size == 0 && nsblk->uuid)
 403                         /* delete allocation */;
 404                 else if (!nsblk->uuid || !nsblk->lbasize)
 405                         return 0;
 406
 407                 return nd_blk_namespace_label_update(nd_region, nsblk, size);
 408         } else
 409                 return -ENXIO;
 410 }
 411
 412 static ssize_t alt_name_store(struct device *dev,
 413                 struct device_attribute *attr, const char *buf, size_t len)
 414 {
 415         struct nd_region *nd_region = to_nd_region(dev->parent);
 416         ssize_t rc;
 417
 418         device_lock(dev);
 419         nvdimm_bus_lock(dev);
 420         wait_nvdimm_bus_probe_idle(dev);
 421         rc = __alt_name_store(dev, buf, len);
 422         if (rc >= 0)
 423                 rc = nd_namespace_label_update(nd_region, dev);
 424         dev_dbg(dev, "%s: %s(%zd)\n", __func__, rc < 0 ? "fail " : "", rc);
 425         nvdimm_bus_unlock(dev);
 426         device_unlock(dev);
 427
 428         return rc < 0 ? rc : len;
 429 }
 430
 431 static ssize_t alt_name_show(struct device *dev,
 432                 struct device_attribute *attr, char *buf)
 433 {
 434         char *ns_altname;
 435
 436         if (is_namespace_pmem(dev)) {
 437                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
 438
 439                 ns_altname = nspm->alt_name;
 440         } else if (is_namespace_blk(dev)) {
 441                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 442
 443                 ns_altname = nsblk->alt_name;
 444         } else
 445                 return -ENXIO;
 446
 447         return sprintf(buf, "%s\n", ns_altname ? ns_altname : "");
 448 }
 449 static DEVICE_ATTR_RW(alt_name);
 450
 451 static int scan_free(struct nd_region *nd_region,
 452                 struct nd_mapping *nd_mapping, struct nd_label_id *label_id,
 453                 resource_size_t n)
 454 {
 455         bool is_blk = strncmp(label_id->id, "blk", 3) == 0;
 456         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 457         int rc = 0;
 458
 459         while (n) {
 460                 struct resource *res, *last;
 461                 resource_size_t new_start;
 462
 463                 last = NULL;
 464                 for_each_dpa_resource(ndd, res)
 465                         if (strcmp(res->name, label_id->id) == 0)
 466                                 last = res;
 467                 res = last;
 468                 if (!res)
 469                         return 0;
 470
 471                 if (n >= resource_size(res)) {
 472                         n -= resource_size(res);
 473                         nd_dbg_dpa(nd_region, ndd, res, "delete %d\n", rc);
 474                         nvdimm_free_dpa(ndd, res);
 475                         /* retry with last resource deleted */
 476                         continue;
 477                 }
 478
 479                 /*
 480                  * Keep BLK allocations relegated to high DPA as much as
 481                  * possible
 482                  */
 483                 if (is_blk)
 484                         new_start = res->start + n;
 485                 else
 486                         new_start = res->start;
 487
 488                 rc = adjust_resource(res, new_start, resource_size(res) - n);
 489                 if (rc == 0)
 490                         res->flags |= DPA_RESOURCE_ADJUSTED;
 491                 nd_dbg_dpa(nd_region, ndd, res, "shrink %d\n", rc);
 492                 break;
 493         }
 494
 495         return rc;
 496 }
 497
 498 /**
 499  * shrink_dpa_allocation - for each dimm in region free n bytes for label_id
 500  * @nd_region: the set of dimms to reclaim @n bytes from
 501  * @label_id: unique identifier for the namespace consuming this dpa range
 502  * @n: number of bytes per-dimm to release
 503  *
 504  * Assumes resources are ordered.  Starting from the end try to
 505  * adjust_resource() the allocation to @n, but if @n is larger than the
 506  * allocation delete it and find the 'new' last allocation in the label
 507  * set.
 508  */
 509 static int shrink_dpa_allocation(struct nd_region *nd_region,
 510                 struct nd_label_id *label_id, resource_size_t n)
 511 {
 512         int i;
 513
 514         for (i = 0; i < nd_region->ndr_mappings; i++) {
 515                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
 516                 int rc;
 517
 518                 rc = scan_free(nd_region, nd_mapping, label_id, n);
 519                 if (rc)
 520                         return rc;
 521         }
 522
 523         return 0;
 524 }
 525
 526 static resource_size_t init_dpa_allocation(struct nd_label_id *label_id,
 527                 struct nd_region *nd_region, struct nd_mapping *nd_mapping,
 528                 resource_size_t n)
 529 {
 530         bool is_blk = strncmp(label_id->id, "blk", 3) == 0;
 531         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 532         resource_size_t first_dpa;
 533         struct resource *res;
 534         int rc = 0;
 535
 536         /* allocate blk from highest dpa first */
 537         if (is_blk)
 538                 first_dpa = nd_mapping->start + nd_mapping->size - n;
 539         else
 540                 first_dpa = nd_mapping->start;
 541
 542         /* first resource allocation for this label-id or dimm */
 543         res = nvdimm_allocate_dpa(ndd, label_id, first_dpa, n);
 544         if (!res)
 545                 rc = -EBUSY;
 546
 547         nd_dbg_dpa(nd_region, ndd, res, "init %d\n", rc);
 548         return rc ? n : 0;
 549 }
 550
 551
 552 /**
 553  * space_valid() - validate free dpa space against constraints
 554  * @nd_region: hosting region of the free space
 555  * @ndd: dimm device data for debug
 556  * @label_id: namespace id to allocate space
 557  * @prev: potential allocation that precedes free space
 558  * @next: allocation that follows the given free space range
 559  * @exist: first allocation with same id in the mapping
 560  * @n: range that must satisfied for pmem allocations
 561  * @valid: free space range to validate
 562  *
 563  * BLK-space is valid as long as it does not precede a PMEM
 564  * allocation in a given region. PMEM-space must be contiguous
 565  * and adjacent to an existing existing allocation (if one
 566  * exists).  If reserving PMEM any space is valid.
 567  */
 568 static void space_valid(struct nd_region *nd_region, struct nvdimm_drvdata *ndd,
 569                 struct nd_label_id *label_id, struct resource *prev,
 570                 struct resource *next, struct resource *exist,
 571                 resource_size_t n, struct resource *valid)
 572 {
 573         bool is_reserve = strcmp(label_id->id, "pmem-reserve") == 0;
 574         bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
 575
 576         if (valid->start >= valid->end)
 577                 goto invalid;
 578
 579         if (is_reserve)
 580                 return;
 581
 582         if (!is_pmem) {
 583                 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
 584                 struct nvdimm_bus *nvdimm_bus;
 585                 struct blk_alloc_info info = {
 586                         .nd_mapping = nd_mapping,
 587                         .available = nd_mapping->size,
 588                         .res = valid,
 589                 };
 590
 591                 WARN_ON(!is_nd_blk(&nd_region->dev));
 592                 nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
 593                 device_for_each_child(&nvdimm_bus->dev, &info, alias_dpa_busy);
 594                 return;
 595         }
 596
 597         /* allocation needs to be contiguous, so this is all or nothing */
 598         if (resource_size(valid) < n)
 599                 goto invalid;
 600
 601         /* we've got all the space we need and no existing allocation */
 602         if (!exist)
 603                 return;
 604
 605         /* allocation needs to be contiguous with the existing namespace */
 606         if (valid->start == exist->end + 1
 607                         || valid->end == exist->start - 1)
 608                 return;
 609
 610  invalid:
 611         /* truncate @valid size to 0 */
 612         valid->end = valid->start - 1;
 613 }
 614
 615 enum alloc_loc {
 616         ALLOC_ERR = 0, ALLOC_BEFORE, ALLOC_MID, ALLOC_AFTER,
 617 };
 618
 619 static resource_size_t scan_allocate(struct nd_region *nd_region,
 620                 struct nd_mapping *nd_mapping, struct nd_label_id *label_id,
 621                 resource_size_t n)
 622 {
 623         resource_size_t mapping_end = nd_mapping->start + nd_mapping->size - 1;
 624         bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
 625         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 626         struct resource *res, *exist = NULL, valid;
 627         const resource_size_t to_allocate = n;
 628         int first;
 629
 630         for_each_dpa_resource(ndd, res)
 631                 if (strcmp(label_id->id, res->name) == 0)
 632                         exist = res;
 633
 634         valid.start = nd_mapping->start;
 635         valid.end = mapping_end;
 636         valid.name = "free space";
 637  retry:
 638         first = 0;
 639         for_each_dpa_resource(ndd, res) {
 640                 struct resource *next = res->sibling, *new_res = NULL;
 641                 resource_size_t allocate, available = 0;
 642                 enum alloc_loc loc = ALLOC_ERR;
 643                 const char *action;
 644                 int rc = 0;
 645
 646                 /* ignore resources outside this nd_mapping */
 647                 if (res->start > mapping_end)
 648                         continue;
 649                 if (res->end < nd_mapping->start)
 650                         continue;
 651
 652                 /* space at the beginning of the mapping */
 653                 if (!first++ && res->start > nd_mapping->start) {
 654                         valid.start = nd_mapping->start;
 655                         valid.end = res->start - 1;
 656                         space_valid(nd_region, ndd, label_id, NULL, next, exist,
 657                                         to_allocate, &valid);
 658                         available = resource_size(&valid);
 659                         if (available)
 660                                 loc = ALLOC_BEFORE;
 661                 }
 662
 663                 /* space between allocations */
 664                 if (!loc && next) {
 665                         valid.start = res->start + resource_size(res);
 666                         valid.end = min(mapping_end, next->start - 1);
 667                         space_valid(nd_region, ndd, label_id, res, next, exist,
 668                                         to_allocate, &valid);
 669                         available = resource_size(&valid);
 670                         if (available)
 671                                 loc = ALLOC_MID;
 672                 }
 673
 674                 /* space at the end of the mapping */
 675                 if (!loc && !next) {
 676                         valid.start = res->start + resource_size(res);
 677                         valid.end = mapping_end;
 678                         space_valid(nd_region, ndd, label_id, res, next, exist,
 679                                         to_allocate, &valid);
 680                         available = resource_size(&valid);
 681                         if (available)
 682                                 loc = ALLOC_AFTER;
 683                 }
 684
 685                 if (!loc || !available)
 686                         continue;
 687                 allocate = min(available, n);
 688                 switch (loc) {
 689                 case ALLOC_BEFORE:
 690                         if (strcmp(res->name, label_id->id) == 0) {
 691                                 /* adjust current resource up */
 692                                 rc = adjust_resource(res, res->start - allocate,
 693                                                 resource_size(res) + allocate);
 694                                 action = "cur grow up";
 695                         } else
 696                                 action = "allocate";
 697                         break;
 698                 case ALLOC_MID:
 699                         if (strcmp(next->name, label_id->id) == 0) {
 700                                 /* adjust next resource up */
 701                                 rc = adjust_resource(next, next->start
 702                                                 - allocate, resource_size(next)
 703                                                 + allocate);
 704                                 new_res = next;
 705                                 action = "next grow up";
 706                         } else if (strcmp(res->name, label_id->id) == 0) {
 707                                 action = "grow down";
 708                         } else
 709                                 action = "allocate";
 710                         break;
 711                 case ALLOC_AFTER:
 712                         if (strcmp(res->name, label_id->id) == 0)
 713                                 action = "grow down";
 714                         else
 715                                 action = "allocate";
 716                         break;
 717                 default:
 718                         return n;
 719                 }
 720
 721                 if (strcmp(action, "allocate") == 0) {
 722                         /* BLK allocate bottom up */
 723                         if (!is_pmem)
 724                                 valid.start += available - allocate;
 725
 726                         new_res = nvdimm_allocate_dpa(ndd, label_id,
 727                                         valid.start, allocate);
 728                         if (!new_res)
 729                                 rc = -EBUSY;
 730                 } else if (strcmp(action, "grow down") == 0) {
 731                         /* adjust current resource down */
 732                         rc = adjust_resource(res, res->start, resource_size(res)
 733                                         + allocate);
 734                         if (rc == 0)
 735                                 res->flags |= DPA_RESOURCE_ADJUSTED;
 736                 }
 737
 738                 if (!new_res)
 739                         new_res = res;
 740
 741                 nd_dbg_dpa(nd_region, ndd, new_res, "%s(%d) %d\n",
 742                                 action, loc, rc);
 743
 744                 if (rc)
 745                         return n;
 746
 747                 n -= allocate;
 748                 if (n) {
 749                         /*
 750                          * Retry scan with newly inserted resources.
 751                          * For example, if we did an ALLOC_BEFORE
 752                          * insertion there may also have been space
 753                          * available for an ALLOC_AFTER insertion, so we
 754                          * need to check this same resource again
 755                          */
 756                         goto retry;
 757                 } else
 758                         return 0;
 759         }
 760
 761         /*
 762          * If we allocated nothing in the BLK case it may be because we are in
 763          * an initial "pmem-reserve pass".  Only do an initial BLK allocation
 764          * when none of the DPA space is reserved.
 765          */
 766         if ((is_pmem || !ndd->dpa.child) && n == to_allocate)
 767                 return init_dpa_allocation(label_id, nd_region, nd_mapping, n);
 768         return n;
 769 }
 770
 771 static int merge_dpa(struct nd_region *nd_region,
 772                 struct nd_mapping *nd_mapping, struct nd_label_id *label_id)
 773 {
 774         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 775         struct resource *res;
 776
 777         if (strncmp("pmem", label_id->id, 4) == 0)
 778                 return 0;
 779  retry:
 780         for_each_dpa_resource(ndd, res) {
 781                 int rc;
 782                 struct resource *next = res->sibling;
 783                 resource_size_t end = res->start + resource_size(res);
 784
 785                 if (!next || strcmp(res->name, label_id->id) != 0
 786                                 || strcmp(next->name, label_id->id) != 0
 787                                 || end != next->start)
 788                         continue;
 789                 end += resource_size(next);
 790                 nvdimm_free_dpa(ndd, next);
 791                 rc = adjust_resource(res, res->start, end - res->start);
 792                 nd_dbg_dpa(nd_region, ndd, res, "merge %d\n", rc);
 793                 if (rc)
 794                         return rc;
 795                 res->flags |= DPA_RESOURCE_ADJUSTED;
 796                 goto retry;
 797         }
 798
 799         return 0;
 800 }
 801
 802 static int __reserve_free_pmem(struct device *dev, void *data)
 803 {
 804         struct nvdimm *nvdimm = data;
 805         struct nd_region *nd_region;
 806         struct nd_label_id label_id;
 807         int i;
 808
 809         if (!is_memory(dev))
 810                 return 0;
 811
 812         nd_region = to_nd_region(dev);
 813         if (nd_region->ndr_mappings == 0)
 814                 return 0;
 815
 816         memset(&label_id, 0, sizeof(label_id));
 817         strcat(label_id.id, "pmem-reserve");
 818         for (i = 0; i < nd_region->ndr_mappings; i++) {
 819                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
 820                 resource_size_t n, rem = 0;
 821
 822                 if (nd_mapping->nvdimm != nvdimm)
 823                         continue;
 824
 825                 n = nd_pmem_available_dpa(nd_region, nd_mapping, &rem);
 826                 if (n == 0)
 827                         return 0;
 828                 rem = scan_allocate(nd_region, nd_mapping, &label_id, n);
 829                 dev_WARN_ONCE(&nd_region->dev, rem,
 830                                 "pmem reserve underrun: %#llx of %#llx bytes\n",
 831                                 (unsigned long long) n - rem,
 832                                 (unsigned long long) n);
 833                 return rem ? -ENXIO : 0;
 834         }
 835
 836         return 0;
 837 }
 838
 839 static void release_free_pmem(struct nvdimm_bus *nvdimm_bus,
 840                 struct nd_mapping *nd_mapping)
 841 {
 842         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 843         struct resource *res, *_res;
 844
 845         for_each_dpa_resource_safe(ndd, res, _res)
 846                 if (strcmp(res->name, "pmem-reserve") == 0)
 847                         nvdimm_free_dpa(ndd, res);
 848 }
 849
 850 static int reserve_free_pmem(struct nvdimm_bus *nvdimm_bus,
 851                 struct nd_mapping *nd_mapping)
 852 {
 853         struct nvdimm *nvdimm = nd_mapping->nvdimm;
 854         int rc;
 855
 856         rc = device_for_each_child(&nvdimm_bus->dev, nvdimm,
 857                         __reserve_free_pmem);
 858         if (rc)
 859                 release_free_pmem(nvdimm_bus, nd_mapping);
 860         return rc;
 861 }
 862
 863 /**
 864  * grow_dpa_allocation - for each dimm allocate n bytes for @label_id
 865  * @nd_region: the set of dimms to allocate @n more bytes from
 866  * @label_id: unique identifier for the namespace consuming this dpa range
 867  * @n: number of bytes per-dimm to add to the existing allocation
 868  *
 869  * Assumes resources are ordered.  For BLK regions, first consume
 870  * BLK-only available DPA free space, then consume PMEM-aliased DPA
 871  * space starting at the highest DPA.  For PMEM regions start
 872  * allocations from the start of an interleave set and end at the first
 873  * BLK allocation or the end of the interleave set, whichever comes
 874  * first.
 875  */
 876 static int grow_dpa_allocation(struct nd_region *nd_region,
 877                 struct nd_label_id *label_id, resource_size_t n)
 878 {
 879         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
 880         bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
 881         int i;
 882
 883         for (i = 0; i < nd_region->ndr_mappings; i++) {
 884                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
 885                 resource_size_t rem = n;
 886                 int rc, j;
 887
 888                 /*
 889                  * In the BLK case try once with all unallocated PMEM
 890                  * reserved, and once without
 891                  */
 892                 for (j = is_pmem; j < 2; j++) {
 893                         bool blk_only = j == 0;
 894
 895                         if (blk_only) {
 896                                 rc = reserve_free_pmem(nvdimm_bus, nd_mapping);
 897                                 if (rc)
 898                                         return rc;
 899                         }
 900                         rem = scan_allocate(nd_region, nd_mapping,
 901                                         label_id, rem);
 902                         if (blk_only)
 903                                 release_free_pmem(nvdimm_bus, nd_mapping);
 904
 905                         /* try again and allow encroachments into PMEM */
 906                         if (rem == 0)
 907                                 break;
 908                 }
 909
 910                 dev_WARN_ONCE(&nd_region->dev, rem,
 911                                 "allocation underrun: %#llx of %#llx bytes\n",
 912                                 (unsigned long long) n - rem,
 913                                 (unsigned long long) n);
 914                 if (rem)
 915                         return -ENXIO;
 916
 917                 rc = merge_dpa(nd_region, nd_mapping, label_id);
 918                 if (rc)
 919                         return rc;
 920         }
 921
 922         return 0;
 923 }
 924
 925 static void nd_namespace_pmem_set_resource(struct nd_region *nd_region,
 926                 struct nd_namespace_pmem *nspm, resource_size_t size)
 927 {
 928         struct resource *res = &nspm->nsio.res;
 929         resource_size_t offset = 0;
 930
 931         if (size && !nspm->uuid) {
 932                 WARN_ON_ONCE(1);
 933                 size = 0;
 934         }
 935
 936         if (size && nspm->uuid) {
 937                 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
 938                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 939                 struct nd_label_id label_id;
 940                 struct resource *res;
 941
 942                 if (!ndd) {
 943                         size = 0;
 944                         goto out;
 945                 }
 946
 947                 nd_label_gen_id(&label_id, nspm->uuid, 0);
 948
 949                 /* calculate a spa offset from the dpa allocation offset */
 950                 for_each_dpa_resource(ndd, res)
 951                         if (strcmp(res->name, label_id.id) == 0) {
 952                                 offset = (res->start - nd_mapping->start)
 953                                         * nd_region->ndr_mappings;
 954                                 goto out;
 955                         }
 956
 957                 WARN_ON_ONCE(1);
 958                 size = 0;
 959         }
 960
 961  out:
 962         res->start = nd_region->ndr_start + offset;
 963         res->end = res->start + size - 1;
 964 }
 965
 966 static bool uuid_not_set(const u8 *uuid, struct device *dev, const char *where)
 967 {
 968         if (!uuid) {
 969                 dev_dbg(dev, "%s: uuid not set\n", where);
 970                 return true;
 971         }
 972         return false;
 973 }
 974
 975 static ssize_t __size_store(struct device *dev, unsigned long long val)
 976 {
 977         resource_size_t allocated = 0, available = 0;
 978         struct nd_region *nd_region = to_nd_region(dev->parent);
 979         struct nd_namespace_common *ndns = to_ndns(dev);
 980         struct nd_mapping *nd_mapping;
 981         struct nvdimm_drvdata *ndd;
 982         struct nd_label_id label_id;
 983         u32 flags = 0, remainder;
 984         int rc, i, id = -1;
 985         u8 *uuid = NULL;
 986
 987         if (dev->driver || ndns->claim)
 988                 return -EBUSY;
 989
 990         if (is_namespace_pmem(dev)) {
 991                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
 992
 993                 uuid = nspm->uuid;
 994                 id = nspm->id;
 995         } else if (is_namespace_blk(dev)) {
 996                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 997
 998                 uuid = nsblk->uuid;
 999                 flags = NSLABEL_FLAG_LOCAL;
1000                 id = nsblk->id;
1001         }
1002
1003         /*
1004          * We need a uuid for the allocation-label and dimm(s) on which
1005          * to store the label.
1006          */
1007         if (uuid_not_set(uuid, dev, __func__))
1008                 return -ENXIO;
1009         if (nd_region->ndr_mappings == 0) {
1010                 dev_dbg(dev, "%s: not associated with dimm(s)\n", __func__);
1011                 return -ENXIO;
1012         }
1013
1014         div_u64_rem(val, SZ_4K * nd_region->ndr_mappings, &remainder);
1015         if (remainder) {
1016                 dev_dbg(dev, "%llu is not %dK aligned\n", val,
1017                                 (SZ_4K * nd_region->ndr_mappings) / SZ_1K);
1018                 return -EINVAL;
1019         }
1020
1021         nd_label_gen_id(&label_id, uuid, flags);
1022         for (i = 0; i < nd_region->ndr_mappings; i++) {
1023                 nd_mapping = &nd_region->mapping[i];
1024                 ndd = to_ndd(nd_mapping);
1025
1026                 /*
1027                  * All dimms in an interleave set, or the base dimm for a blk
1028                  * region, need to be enabled for the size to be changed.
1029                  */
1030                 if (!ndd)
1031                         return -ENXIO;
1032
1033                 allocated += nvdimm_allocated_dpa(ndd, &label_id);
1034         }
1035         available = nd_region_available_dpa(nd_region);
1036
1037         if (val > available + allocated)
1038                 return -ENOSPC;
1039
1040         if (val == allocated)
1041                 return 0;
1042
1043         val = div_u64(val, nd_region->ndr_mappings);
1044         allocated = div_u64(allocated, nd_region->ndr_mappings);
1045         if (val < allocated)
1046                 rc = shrink_dpa_allocation(nd_region, &label_id,
1047                                 allocated - val);
1048         else
1049                 rc = grow_dpa_allocation(nd_region, &label_id, val - allocated);
1050
1051         if (rc)
1052                 return rc;
1053
1054         if (is_namespace_pmem(dev)) {
1055                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1056
1057                 nd_namespace_pmem_set_resource(nd_region, nspm,
1058                                 val * nd_region->ndr_mappings);
1059         }
1060
1061         /*
1062          * Try to delete the namespace if we deleted all of its
1063          * allocation, this is not the seed or 0th device for the
1064          * region, and it is not actively claimed by a btt, pfn, or dax
1065          * instance.
1066          */
1067         if (val == 0 && id != 0 && nd_region->ns_seed != dev && !ndns->claim)
1068                 nd_device_unregister(dev, ND_ASYNC);
1069
1070         return rc;
1071 }
1072
1073 static ssize_t size_store(struct device *dev,
1074                 struct device_attribute *attr, const char *buf, size_t len)
1075 {
1076         struct nd_region *nd_region = to_nd_region(dev->parent);
1077         unsigned long long val;
1078         u8 **uuid = NULL;
1079         int rc;
1080
1081         rc = kstrtoull(buf, 0, &val);
1082         if (rc)
1083                 return rc;
1084
1085         device_lock(dev);
1086         nvdimm_bus_lock(dev);
1087         wait_nvdimm_bus_probe_idle(dev);
1088         rc = __size_store(dev, val);
1089         if (rc >= 0)
1090                 rc = nd_namespace_label_update(nd_region, dev);
1091
1092         if (is_namespace_pmem(dev)) {
1093                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1094
1095                 uuid = &nspm->uuid;
1096         } else if (is_namespace_blk(dev)) {
1097                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1098
1099                 uuid = &nsblk->uuid;
1100         }
1101
1102         if (rc == 0 && val == 0 && uuid) {
1103                 /* setting size zero == 'delete namespace' */
1104                 kfree(*uuid);
1105                 *uuid = NULL;
1106         }
1107
1108         dev_dbg(dev, "%s: %llx %s (%d)\n", __func__, val, rc < 0
1109                         ? "fail" : "success", rc);
1110
1111         nvdimm_bus_unlock(dev);
1112         device_unlock(dev);
1113
1114         return rc < 0 ? rc : len;
1115 }
1116
1117 resource_size_t __nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
1118 {
1119         struct device *dev = &ndns->dev;
1120
1121         if (is_namespace_pmem(dev)) {
1122                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1123
1124                 return resource_size(&nspm->nsio.res);
1125         } else if (is_namespace_blk(dev)) {
1126                 return nd_namespace_blk_size(to_nd_namespace_blk(dev));
1127         } else if (is_namespace_io(dev)) {
1128                 struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
1129
1130                 return resource_size(&nsio->res);
1131         } else
1132                 WARN_ONCE(1, "unknown namespace type\n");
1133         return 0;
1134 }
1135
1136 resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
1137 {
1138         resource_size_t size;
1139
1140         nvdimm_bus_lock(&ndns->dev);
1141         size = __nvdimm_namespace_capacity(ndns);
1142         nvdimm_bus_unlock(&ndns->dev);
1143
1144         return size;
1145 }
1146 EXPORT_SYMBOL(nvdimm_namespace_capacity);
1147
1148 static ssize_t size_show(struct device *dev,
1149                 struct device_attribute *attr, char *buf)
1150 {
1151         return sprintf(buf, "%llu\n", (unsigned long long)
1152                         nvdimm_namespace_capacity(to_ndns(dev)));
1153 }
1154 static DEVICE_ATTR(size, 0444, size_show, size_store);
1155
1156 static u8 *namespace_to_uuid(struct device *dev)
1157 {
1158         if (is_namespace_pmem(dev)) {
1159                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1160
1161                 return nspm->uuid;
1162         } else if (is_namespace_blk(dev)) {
1163                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1164
1165                 return nsblk->uuid;
1166         } else
1167                 return ERR_PTR(-ENXIO);
1168 }
1169
1170 static ssize_t uuid_show(struct device *dev,
1171                 struct device_attribute *attr, char *buf)
1172 {
1173         u8 *uuid = namespace_to_uuid(dev);
1174
1175         if (IS_ERR(uuid))
1176                 return PTR_ERR(uuid);
1177         if (uuid)
1178                 return sprintf(buf, "%pUb\n", uuid);
1179         return sprintf(buf, "\n");
1180 }
1181
1182 /**
1183  * namespace_update_uuid - check for a unique uuid and whether we're "renaming"
1184  * @nd_region: parent region so we can updates all dimms in the set
1185  * @dev: namespace type for generating label_id
1186  * @new_uuid: incoming uuid
1187  * @old_uuid: reference to the uuid storage location in the namespace object
1188  */
1189 static int namespace_update_uuid(struct nd_region *nd_region,
1190                 struct device *dev, u8 *new_uuid, u8 **old_uuid)
1191 {
1192         u32 flags = is_namespace_blk(dev) ? NSLABEL_FLAG_LOCAL : 0;
1193         struct nd_label_id old_label_id;
1194         struct nd_label_id new_label_id;
1195         int i;
1196
1197         if (!nd_is_uuid_unique(dev, new_uuid))
1198                 return -EINVAL;
1199
1200         if (*old_uuid == NULL)
1201                 goto out;
1202
1203         /*
1204          * If we've already written a label with this uuid, then it's
1205          * too late to rename because we can't reliably update the uuid
1206          * without losing the old namespace.  Userspace must delete this
1207          * namespace to abandon the old uuid.
1208          */
1209         for (i = 0; i < nd_region->ndr_mappings; i++) {
1210                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1211
1212                 /*
1213                  * This check by itself is sufficient because old_uuid
1214                  * would be NULL above if this uuid did not exist in the
1215                  * currently written set.
1216                  *
1217                  * FIXME: can we delete uuid with zero dpa allocated?
1218                  */
1219                 if (list_empty(&nd_mapping->labels))
1220                         return -EBUSY;
1221         }
1222
1223         nd_label_gen_id(&old_label_id, *old_uuid, flags);
1224         nd_label_gen_id(&new_label_id, new_uuid, flags);
1225         for (i = 0; i < nd_region->ndr_mappings; i++) {
1226                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1227                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1228                 struct resource *res;
1229
1230                 for_each_dpa_resource(ndd, res)
1231                         if (strcmp(res->name, old_label_id.id) == 0)
1232                                 sprintf((void *) res->name, "%s",
1233                                                 new_label_id.id);
1234         }
1235         kfree(*old_uuid);
1236  out:
1237         *old_uuid = new_uuid;
1238         return 0;
1239 }
1240
1241 static ssize_t uuid_store(struct device *dev,
1242                 struct device_attribute *attr, const char *buf, size_t len)
1243 {
1244         struct nd_region *nd_region = to_nd_region(dev->parent);
1245         u8 *uuid = NULL;
1246         ssize_t rc = 0;
1247         u8 **ns_uuid;
1248
1249         if (is_namespace_pmem(dev)) {
1250                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1251
1252                 ns_uuid = &nspm->uuid;
1253         } else if (is_namespace_blk(dev)) {
1254                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1255
1256                 ns_uuid = &nsblk->uuid;
1257         } else
1258                 return -ENXIO;
1259
1260         device_lock(dev);
1261         nvdimm_bus_lock(dev);
1262         wait_nvdimm_bus_probe_idle(dev);
1263         if (to_ndns(dev)->claim)
1264                 rc = -EBUSY;
1265         if (rc >= 0)
1266                 rc = nd_uuid_store(dev, &uuid, buf, len);
1267         if (rc >= 0)
1268                 rc = namespace_update_uuid(nd_region, dev, uuid, ns_uuid);
1269         if (rc >= 0)
1270                 rc = nd_namespace_label_update(nd_region, dev);
1271         else
1272                 kfree(uuid);
1273         dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
1274                         rc, buf, buf[len - 1] == '\n' ? "" : "\n");
1275         nvdimm_bus_unlock(dev);
1276         device_unlock(dev);
1277
1278         return rc < 0 ? rc : len;
1279 }
1280 static DEVICE_ATTR_RW(uuid);
1281
1282 static ssize_t resource_show(struct device *dev,
1283                 struct device_attribute *attr, char *buf)
1284 {
1285         struct resource *res;
1286
1287         if (is_namespace_pmem(dev)) {
1288                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1289
1290                 res = &nspm->nsio.res;
1291         } else if (is_namespace_io(dev)) {
1292                 struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
1293
1294                 res = &nsio->res;
1295         } else
1296                 return -ENXIO;
1297
1298         /* no address to convey if the namespace has no allocation */
1299         if (resource_size(res) == 0)
1300                 return -ENXIO;
1301         return sprintf(buf, "%#llx\n", (unsigned long long) res->start);
1302 }
1303 static DEVICE_ATTR_RO(resource);
1304
1305 static const unsigned long blk_lbasize_supported[] = { 512, 520, 528,
1306         4096, 4104, 4160, 4224, 0 };
1307
1308 static const unsigned long pmem_lbasize_supported[] = { 512, 4096, 0 };
1309
1310 static ssize_t sector_size_show(struct device *dev,
1311                 struct device_attribute *attr, char *buf)
1312 {
1313         if (is_namespace_blk(dev)) {
1314                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1315
1316                 return nd_sector_size_show(nsblk->lbasize,
1317                                 blk_lbasize_supported, buf);
1318         }
1319
1320         if (is_namespace_pmem(dev)) {
1321                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1322
1323                 return nd_sector_size_show(nspm->lbasize,
1324                                 pmem_lbasize_supported, buf);
1325         }
1326         return -ENXIO;
1327 }
1328
1329 static ssize_t sector_size_store(struct device *dev,
1330                 struct device_attribute *attr, const char *buf, size_t len)
1331 {
1332         struct nd_region *nd_region = to_nd_region(dev->parent);
1333         const unsigned long *supported;
1334         unsigned long *lbasize;
1335         ssize_t rc = 0;
1336
1337         if (is_namespace_blk(dev)) {
1338                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1339
1340                 lbasize = &nsblk->lbasize;
1341                 supported = blk_lbasize_supported;
1342         } else if (is_namespace_pmem(dev)) {
1343                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1344
1345                 lbasize = &nspm->lbasize;
1346                 supported = pmem_lbasize_supported;
1347         } else
1348                 return -ENXIO;
1349
1350         device_lock(dev);
1351         nvdimm_bus_lock(dev);
1352         if (to_ndns(dev)->claim)
1353                 rc = -EBUSY;
1354         if (rc >= 0)
1355                 rc = nd_sector_size_store(dev, buf, lbasize, supported);
1356         if (rc >= 0)
1357                 rc = nd_namespace_label_update(nd_region, dev);
1358         dev_dbg(dev, "%s: result: %zd %s: %s%s", __func__,
1359                         rc, rc < 0 ? "tried" : "wrote", buf,
1360                         buf[len - 1] == '\n' ? "" : "\n");
1361         nvdimm_bus_unlock(dev);
1362         device_unlock(dev);
1363
1364         return rc ? rc : len;
1365 }
1366 static DEVICE_ATTR_RW(sector_size);
1367
1368 static ssize_t dpa_extents_show(struct device *dev,
1369                 struct device_attribute *attr, char *buf)
1370 {
1371         struct nd_region *nd_region = to_nd_region(dev->parent);
1372         struct nd_label_id label_id;
1373         int count = 0, i;
1374         u8 *uuid = NULL;
1375         u32 flags = 0;
1376
1377         nvdimm_bus_lock(dev);
1378         if (is_namespace_pmem(dev)) {
1379                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1380
1381                 uuid = nspm->uuid;
1382                 flags = 0;
1383         } else if (is_namespace_blk(dev)) {
1384                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1385
1386                 uuid = nsblk->uuid;
1387                 flags = NSLABEL_FLAG_LOCAL;
1388         }
1389
1390         if (!uuid)
1391                 goto out;
1392
1393         nd_label_gen_id(&label_id, uuid, flags);
1394         for (i = 0; i < nd_region->ndr_mappings; i++) {
1395                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1396                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1397                 struct resource *res;
1398
1399                 for_each_dpa_resource(ndd, res)
1400                         if (strcmp(res->name, label_id.id) == 0)
1401                                 count++;
1402         }
1403  out:
1404         nvdimm_bus_unlock(dev);
1405
1406         return sprintf(buf, "%d\n", count);
1407 }
1408 static DEVICE_ATTR_RO(dpa_extents);
1409
1410 static int btt_claim_class(struct device *dev)
1411 {
1412         struct nd_region *nd_region = to_nd_region(dev->parent);
1413         int i, loop_bitmask = 0;
1414
1415         for (i = 0; i < nd_region->ndr_mappings; i++) {
1416                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1417                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1418                 struct nd_namespace_index *nsindex;
1419
1420                 nsindex = to_namespace_index(ndd, ndd->ns_current);
1421                 if (nsindex == NULL)
1422                         loop_bitmask |= 1;
1423                 else {
1424                         /* check whether existing labels are v1.1 or v1.2 */
1425                         if (__le16_to_cpu(nsindex->major) == 1
1426                                         && __le16_to_cpu(nsindex->minor) == 1)
1427                                 loop_bitmask |= 2;
1428                         else
1429                                 loop_bitmask |= 4;
1430                 }
1431         }
1432         /*
1433          * If nsindex is null loop_bitmask's bit 0 will be set, and if an index
1434          * block is found, a v1.1 label for any mapping will set bit 1, and a
1435          * v1.2 label will set bit 2.
1436          *
1437          * At the end of the loop, at most one of the three bits must be set.
1438          * If multiple bits were set, it means the different mappings disagree
1439          * about their labels, and this must be cleaned up first.
1440          *
1441          * If all the label index blocks are found to agree, nsindex of NULL
1442          * implies labels haven't been initialized yet, and when they will,
1443          * they will be of the 1.2 format, so we can assume BTT2.0
1444          *
1445          * If 1.1 labels are found, we enforce BTT1.1, and if 1.2 labels are
1446          * found, we enforce BTT2.0
1447          *
1448          * If the loop was never entered, default to BTT1.1 (legacy namespaces)
1449          */
1450         switch (loop_bitmask) {
1451         case 0:
1452         case 2:
1453                 return NVDIMM_CCLASS_BTT;
1454         case 1:
1455         case 4:
1456                 return NVDIMM_CCLASS_BTT2;
1457         default:
1458                 return -ENXIO;
1459         }
1460 }
1461
1462 static ssize_t holder_show(struct device *dev,
1463                 struct device_attribute *attr, char *buf)
1464 {
1465         struct nd_namespace_common *ndns = to_ndns(dev);
1466         ssize_t rc;
1467
1468         device_lock(dev);
1469         rc = sprintf(buf, "%s\n", ndns->claim ? dev_name(ndns->claim) : "");
1470         device_unlock(dev);
1471
1472         return rc;
1473 }
1474 static DEVICE_ATTR_RO(holder);
1475
1476 static ssize_t __holder_class_store(struct device *dev, const char *buf)
1477 {
1478         struct nd_namespace_common *ndns = to_ndns(dev);
1479
1480         if (dev->driver || ndns->claim)
1481                 return -EBUSY;
1482
1483         if (strcmp(buf, "btt") == 0 || strcmp(buf, "btt\n") == 0)
1484                 ndns->claim_class = btt_claim_class(dev);
1485         else if (strcmp(buf, "pfn") == 0 || strcmp(buf, "pfn\n") == 0)
1486                 ndns->claim_class = NVDIMM_CCLASS_PFN;
1487         else if (strcmp(buf, "dax") == 0 || strcmp(buf, "dax\n") == 0)
1488                 ndns->claim_class = NVDIMM_CCLASS_DAX;
1489         else if (strcmp(buf, "") == 0 || strcmp(buf, "\n") == 0)
1490                 ndns->claim_class = NVDIMM_CCLASS_NONE;
1491         else
1492                 return -EINVAL;
1493
1494         /* btt_claim_class() could've returned an error */
1495         if (ndns->claim_class < 0)
1496                 return ndns->claim_class;
1497
1498         return 0;
1499 }
1500
1501 static ssize_t holder_class_store(struct device *dev,
1502                 struct device_attribute *attr, const char *buf, size_t len)
1503 {
1504         struct nd_region *nd_region = to_nd_region(dev->parent);
1505         ssize_t rc;
1506
1507         device_lock(dev);
1508         nvdimm_bus_lock(dev);
1509         wait_nvdimm_bus_probe_idle(dev);
1510         rc = __holder_class_store(dev, buf);
1511         if (rc >= 0)
1512                 rc = nd_namespace_label_update(nd_region, dev);
1513         dev_dbg(dev, "%s: %s(%zd)\n", __func__, rc < 0 ? "fail " : "", rc);
1514         nvdimm_bus_unlock(dev);
1515         device_unlock(dev);
1516
1517         return rc < 0 ? rc : len;
1518 }
1519
1520 static ssize_t holder_class_show(struct device *dev,
1521                 struct device_attribute *attr, char *buf)
1522 {
1523         struct nd_namespace_common *ndns = to_ndns(dev);
1524         ssize_t rc;
1525
1526         device_lock(dev);
1527         if (ndns->claim_class == NVDIMM_CCLASS_NONE)
1528                 rc = sprintf(buf, "\n");
1529         else if ((ndns->claim_class == NVDIMM_CCLASS_BTT) ||
1530                         (ndns->claim_class == NVDIMM_CCLASS_BTT2))
1531                 rc = sprintf(buf, "btt\n");
1532         else if (ndns->claim_class == NVDIMM_CCLASS_PFN)
1533                 rc = sprintf(buf, "pfn\n");
1534         else if (ndns->claim_class == NVDIMM_CCLASS_DAX)
1535                 rc = sprintf(buf, "dax\n");
1536         else
1537                 rc = sprintf(buf, "<unknown>\n");
1538         device_unlock(dev);
1539
1540         return rc;
1541 }
1542 static DEVICE_ATTR_RW(holder_class);
1543
1544 static ssize_t mode_show(struct device *dev,
1545                 struct device_attribute *attr, char *buf)
1546 {
1547         struct nd_namespace_common *ndns = to_ndns(dev);
1548         struct device *claim;
1549         char *mode;
1550         ssize_t rc;
1551
1552         device_lock(dev);
1553         claim = ndns->claim;
1554         if (claim && is_nd_btt(claim))
1555                 mode = "safe";
1556         else if (claim && is_nd_pfn(claim))
1557                 mode = "memory";
1558         else if (claim && is_nd_dax(claim))
1559                 mode = "dax";
1560         else if (!claim && pmem_should_map_pages(dev))
1561                 mode = "memory";
1562         else
1563                 mode = "raw";
1564         rc = sprintf(buf, "%s\n", mode);
1565         device_unlock(dev);
1566
1567         return rc;
1568 }
1569 static DEVICE_ATTR_RO(mode);
1570
1571 static ssize_t force_raw_store(struct device *dev,
1572                 struct device_attribute *attr, const char *buf, size_t len)
1573 {
1574         bool force_raw;
1575         int rc = strtobool(buf, &force_raw);
1576
1577         if (rc)
1578                 return rc;
1579
1580         to_ndns(dev)->force_raw = force_raw;
1581         return len;
1582 }
1583
1584 static ssize_t force_raw_show(struct device *dev,
1585                 struct device_attribute *attr, char *buf)
1586 {
1587         return sprintf(buf, "%d\n", to_ndns(dev)->force_raw);
1588 }
1589 static DEVICE_ATTR_RW(force_raw);
1590
1591 static struct attribute *nd_namespace_attributes[] = {
1592         &dev_attr_nstype.attr,
1593         &dev_attr_size.attr,
1594         &dev_attr_mode.attr,
1595         &dev_attr_uuid.attr,
1596         &dev_attr_holder.attr,
1597         &dev_attr_resource.attr,
1598         &dev_attr_alt_name.attr,
1599         &dev_attr_force_raw.attr,
1600         &dev_attr_sector_size.attr,
1601         &dev_attr_dpa_extents.attr,
1602         &dev_attr_holder_class.attr,
1603         NULL,
1604 };
1605
1606 static umode_t namespace_visible(struct kobject *kobj,
1607                 struct attribute *a, int n)
1608 {
1609         struct device *dev = container_of(kobj, struct device, kobj);
1610
1611         if (a == &dev_attr_resource.attr) {
1612                 if (is_namespace_blk(dev))
1613                         return 0;
1614                 return a->mode;
1615         }
1616
1617         if (is_namespace_pmem(dev) || is_namespace_blk(dev)) {
1618                 if (a == &dev_attr_size.attr)
1619                         return 0644;
1620
1621                 return a->mode;
1622         }
1623
1624         if (a == &dev_attr_nstype.attr || a == &dev_attr_size.attr
1625                         || a == &dev_attr_holder.attr
1626                         || a == &dev_attr_holder_class.attr
1627                         || a == &dev_attr_force_raw.attr
1628                         || a == &dev_attr_mode.attr)
1629                 return a->mode;
1630
1631         return 0;
1632 }
1633
1634 static struct attribute_group nd_namespace_attribute_group = {
1635         .attrs = nd_namespace_attributes,
1636         .is_visible = namespace_visible,
1637 };
1638
1639 static const struct attribute_group *nd_namespace_attribute_groups[] = {
1640         &nd_device_attribute_group,
1641         &nd_namespace_attribute_group,
1642         &nd_numa_attribute_group,
1643         NULL,
1644 };
1645
1646 struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev)
1647 {
1648         struct nd_btt *nd_btt = is_nd_btt(dev) ? to_nd_btt(dev) : NULL;
1649         struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL;
1650         struct nd_dax *nd_dax = is_nd_dax(dev) ? to_nd_dax(dev) : NULL;
1651         struct nd_namespace_common *ndns = NULL;
1652         resource_size_t size;
1653
1654         if (nd_btt || nd_pfn || nd_dax) {
1655                 if (nd_btt)
1656                         ndns = nd_btt->ndns;
1657                 else if (nd_pfn)
1658                         ndns = nd_pfn->ndns;
1659                 else if (nd_dax)
1660                         ndns = nd_dax->nd_pfn.ndns;
1661
1662                 if (!ndns)
1663                         return ERR_PTR(-ENODEV);
1664
1665                 /*
1666                  * Flush any in-progess probes / removals in the driver
1667                  * for the raw personality of this namespace.
1668                  */
1669                 device_lock(&ndns->dev);
1670                 device_unlock(&ndns->dev);
1671                 if (ndns->dev.driver) {
1672                         dev_dbg(&ndns->dev, "is active, can't bind %s\n",
1673                                         dev_name(dev));
1674                         return ERR_PTR(-EBUSY);
1675                 }
1676                 if (dev_WARN_ONCE(&ndns->dev, ndns->claim != dev,
1677                                         "host (%s) vs claim (%s) mismatch\n",
1678                                         dev_name(dev),
1679                                         dev_name(ndns->claim)))
1680                         return ERR_PTR(-ENXIO);
1681         } else {
1682                 ndns = to_ndns(dev);
1683                 if (ndns->claim) {
1684                         dev_dbg(dev, "claimed by %s, failing probe\n",
1685                                 dev_name(ndns->claim));
1686
1687                         return ERR_PTR(-ENXIO);
1688                 }
1689         }
1690
1691         size = nvdimm_namespace_capacity(ndns);
1692         if (size < ND_MIN_NAMESPACE_SIZE) {
1693                 dev_dbg(&ndns->dev, "%pa, too small must be at least %#x\n",
1694                                 &size, ND_MIN_NAMESPACE_SIZE);
1695                 return ERR_PTR(-ENODEV);
1696         }
1697
1698         if (is_namespace_pmem(&ndns->dev)) {
1699                 struct nd_namespace_pmem *nspm;
1700
1701                 nspm = to_nd_namespace_pmem(&ndns->dev);
1702                 if (uuid_not_set(nspm->uuid, &ndns->dev, __func__))
1703                         return ERR_PTR(-ENODEV);
1704         } else if (is_namespace_blk(&ndns->dev)) {
1705                 struct nd_namespace_blk *nsblk;
1706
1707                 nsblk = to_nd_namespace_blk(&ndns->dev);
1708                 if (uuid_not_set(nsblk->uuid, &ndns->dev, __func__))
1709                         return ERR_PTR(-ENODEV);
1710                 if (!nsblk->lbasize) {
1711                         dev_dbg(&ndns->dev, "%s: sector size not set\n",
1712                                 __func__);
1713                         return ERR_PTR(-ENODEV);
1714                 }
1715                 if (!nd_namespace_blk_validate(nsblk))
1716                         return ERR_PTR(-ENODEV);
1717         }
1718
1719         return ndns;
1720 }
1721 EXPORT_SYMBOL(nvdimm_namespace_common_probe);
1722
1723 static struct device **create_namespace_io(struct nd_region *nd_region)
1724 {
1725         struct nd_namespace_io *nsio;
1726         struct device *dev, **devs;
1727         struct resource *res;
1728
1729         nsio = kzalloc(sizeof(*nsio), GFP_KERNEL);
1730         if (!nsio)
1731                 return NULL;
1732
1733         devs = kcalloc(2, sizeof(struct device *), GFP_KERNEL);
1734         if (!devs) {
1735                 kfree(nsio);
1736                 return NULL;
1737         }
1738
1739         dev = &nsio->common.dev;
1740         dev->type = &namespace_io_device_type;
1741         dev->parent = &nd_region->dev;
1742         res = &nsio->res;
1743         res->name = dev_name(&nd_region->dev);
1744         res->flags = IORESOURCE_MEM;
1745         res->start = nd_region->ndr_start;
1746         res->end = res->start + nd_region->ndr_size - 1;
1747
1748         devs[0] = dev;
1749         return devs;
1750 }
1751
1752 static bool has_uuid_at_pos(struct nd_region *nd_region, u8 *uuid,
1753                 u64 cookie, u16 pos)
1754 {
1755         struct nd_namespace_label *found = NULL;
1756         int i;
1757
1758         for (i = 0; i < nd_region->ndr_mappings; i++) {
1759                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1760                 struct nd_interleave_set *nd_set = nd_region->nd_set;
1761                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1762                 struct nd_label_ent *label_ent;
1763                 bool found_uuid = false;
1764
1765                 list_for_each_entry(label_ent, &nd_mapping->labels, list) {
1766                         struct nd_namespace_label *nd_label = label_ent->label;
1767                         u16 position, nlabel;
1768                         u64 isetcookie;
1769
1770                         if (!nd_label)
1771                                 continue;
1772                         isetcookie = __le64_to_cpu(nd_label->isetcookie);
1773                         position = __le16_to_cpu(nd_label->position);
1774                         nlabel = __le16_to_cpu(nd_label->nlabel);
1775
1776                         if (isetcookie != cookie)
1777                                 continue;
1778
1779                         if (memcmp(nd_label->uuid, uuid, NSLABEL_UUID_LEN) != 0)
1780                                 continue;
1781
1782                         if (namespace_label_has(ndd, type_guid)
1783                                         && !guid_equal(&nd_set->type_guid,
1784                                                 &nd_label->type_guid)) {
1785                                 dev_dbg(ndd->dev, "expect type_guid %pUb got %pUb\n",
1786                                                 nd_set->type_guid.b,
1787                                                 nd_label->type_guid.b);
1788                                 continue;
1789                         }
1790
1791                         if (found_uuid) {
1792                                 dev_dbg(ndd->dev,
1793                                                 "%s duplicate entry for uuid\n",
1794                                                 __func__);
1795                                 return false;
1796                         }
1797                         found_uuid = true;
1798                         if (nlabel != nd_region->ndr_mappings)
1799                                 continue;
1800                         if (position != pos)
1801                                 continue;
1802                         found = nd_label;
1803                         break;
1804                 }
1805                 if (found)
1806                         break;
1807         }
1808         return found != NULL;
1809 }
1810
1811 static int select_pmem_id(struct nd_region *nd_region, u8 *pmem_id)
1812 {
1813         int i;
1814
1815         if (!pmem_id)
1816                 return -ENODEV;
1817
1818         for (i = 0; i < nd_region->ndr_mappings; i++) {
1819                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1820                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1821                 struct nd_namespace_label *nd_label = NULL;
1822                 u64 hw_start, hw_end, pmem_start, pmem_end;
1823                 struct nd_label_ent *label_ent;
1824
1825                 lockdep_assert_held(&nd_mapping->lock);
1826                 list_for_each_entry(label_ent, &nd_mapping->labels, list) {
1827                         nd_label = label_ent->label;
1828                         if (!nd_label)
1829                                 continue;
1830                         if (memcmp(nd_label->uuid, pmem_id, NSLABEL_UUID_LEN) == 0)
1831                                 break;
1832                         nd_label = NULL;
1833                 }
1834
1835                 if (!nd_label) {
1836                         WARN_ON(1);
1837                         return -EINVAL;
1838                 }
1839
1840                 /*
1841                  * Check that this label is compliant with the dpa
1842                  * range published in NFIT
1843                  */
1844                 hw_start = nd_mapping->start;
1845                 hw_end = hw_start + nd_mapping->size;
1846                 pmem_start = __le64_to_cpu(nd_label->dpa);
1847                 pmem_end = pmem_start + __le64_to_cpu(nd_label->rawsize);
1848                 if (pmem_start >= hw_start && pmem_start < hw_end
1849                                 && pmem_end <= hw_end && pmem_end > hw_start)
1850                         /* pass */;
1851                 else {
1852                         dev_dbg(&nd_region->dev, "%s invalid label for %pUb\n",
1853                                         dev_name(ndd->dev), nd_label->uuid);
1854                         return -EINVAL;
1855                 }
1856
1857                 /* move recently validated label to the front of the list */
1858                 list_move(&label_ent->list, &nd_mapping->labels);
1859         }
1860         return 0;
1861 }
1862
1863 /**
1864  * create_namespace_pmem - validate interleave set labelling, retrieve label0
1865  * @nd_region: region with mappings to validate
1866  * @nspm: target namespace to create
1867  * @nd_label: target pmem namespace label to evaluate
1868  */
1869 struct device *create_namespace_pmem(struct nd_region *nd_region,
1870                 struct nd_namespace_index *nsindex,
1871                 struct nd_namespace_label *nd_label)
1872 {
1873         u64 cookie = nd_region_interleave_set_cookie(nd_region, nsindex);
1874         u64 altcookie = nd_region_interleave_set_altcookie(nd_region);
1875         struct nd_label_ent *label_ent;
1876         struct nd_namespace_pmem *nspm;
1877         struct nd_mapping *nd_mapping;
1878         resource_size_t size = 0;
1879         struct resource *res;
1880         struct device *dev;
1881         int rc = 0;
1882         u16 i;
1883
1884         if (cookie == 0) {
1885                 dev_dbg(&nd_region->dev, "invalid interleave-set-cookie\n");
1886                 return ERR_PTR(-ENXIO);
1887         }
1888
1889         if (__le64_to_cpu(nd_label->isetcookie) != cookie) {
1890                 dev_dbg(&nd_region->dev, "invalid cookie in label: %pUb\n",
1891                                 nd_label->uuid);
1892                 if (__le64_to_cpu(nd_label->isetcookie) != altcookie)
1893                         return ERR_PTR(-EAGAIN);
1894
1895                 dev_dbg(&nd_region->dev, "valid altcookie in label: %pUb\n",
1896                                 nd_label->uuid);
1897         }
1898
1899         nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
1900         if (!nspm)
1901                 return ERR_PTR(-ENOMEM);
1902
1903         nspm->id = -1;
1904         dev = &nspm->nsio.common.dev;
1905         dev->type = &namespace_pmem_device_type;
1906         dev->parent = &nd_region->dev;
1907         res = &nspm->nsio.res;
1908         res->name = dev_name(&nd_region->dev);
1909         res->flags = IORESOURCE_MEM;
1910
1911         for (i = 0; i < nd_region->ndr_mappings; i++) {
1912                 if (has_uuid_at_pos(nd_region, nd_label->uuid, cookie, i))
1913                         continue;
1914                 if (has_uuid_at_pos(nd_region, nd_label->uuid, altcookie, i))
1915                         continue;
1916                 break;
1917         }
1918
1919         if (i < nd_region->ndr_mappings) {
1920                 struct nvdimm_drvdata *ndd = to_ndd(&nd_region->mapping[i]);
1921
1922                 /*
1923                  * Give up if we don't find an instance of a uuid at each
1924                  * position (from 0 to nd_region->ndr_mappings - 1), or if we
1925                  * find a dimm with two instances of the same uuid.
1926                  */
1927                 dev_err(&nd_region->dev, "%s missing label for %pUb\n",
1928                                 dev_name(ndd->dev), nd_label->uuid);
1929                 rc = -EINVAL;
1930                 goto err;
1931         }
1932
1933         /*
1934          * Fix up each mapping's 'labels' to have the validated pmem label for
1935          * that position at labels[0], and NULL at labels[1].  In the process,
1936          * check that the namespace aligns with interleave-set.  We know
1937          * that it does not overlap with any blk namespaces by virtue of
1938          * the dimm being enabled (i.e. nd_label_reserve_dpa()
1939          * succeeded).
1940          */
1941         rc = select_pmem_id(nd_region, nd_label->uuid);
1942         if (rc)
1943                 goto err;
1944
1945         /* Calculate total size and populate namespace properties from label0 */
1946         for (i = 0; i < nd_region->ndr_mappings; i++) {
1947                 struct nd_namespace_label *label0;
1948                 struct nvdimm_drvdata *ndd;
1949
1950                 nd_mapping = &nd_region->mapping[i];
1951                 label_ent = list_first_entry_or_null(&nd_mapping->labels,
1952                                 typeof(*label_ent), list);
1953                 label0 = label_ent ? label_ent->label : 0;
1954
1955                 if (!label0) {
1956                         WARN_ON(1);
1957                         continue;
1958                 }
1959
1960                 size += __le64_to_cpu(label0->rawsize);
1961                 if (__le16_to_cpu(label0->position) != 0)
1962                         continue;
1963                 WARN_ON(nspm->alt_name || nspm->uuid);
1964                 nspm->alt_name = kmemdup((void __force *) label0->name,
1965                                 NSLABEL_NAME_LEN, GFP_KERNEL);
1966                 nspm->uuid = kmemdup((void __force *) label0->uuid,
1967                                 NSLABEL_UUID_LEN, GFP_KERNEL);
1968                 nspm->lbasize = __le64_to_cpu(label0->lbasize);
1969                 ndd = to_ndd(nd_mapping);
1970                 if (namespace_label_has(ndd, abstraction_guid))
1971                         nspm->nsio.common.claim_class
1972                                 = to_nvdimm_cclass(&label0->abstraction_guid);
1973
1974         }
1975
1976         if (!nspm->alt_name || !nspm->uuid) {
1977                 rc = -ENOMEM;
1978                 goto err;
1979         }
1980
1981         nd_namespace_pmem_set_resource(nd_region, nspm, size);
1982
1983         return dev;
1984  err:
1985         namespace_pmem_release(dev);
1986         switch (rc) {
1987         case -EINVAL:
1988                 dev_dbg(&nd_region->dev, "%s: invalid label(s)\n", __func__);
1989                 break;
1990         case -ENODEV:
1991                 dev_dbg(&nd_region->dev, "%s: label not found\n", __func__);
1992                 break;
1993         default:
1994                 dev_dbg(&nd_region->dev, "%s: unexpected err: %d\n",
1995                                 __func__, rc);
1996                 break;
1997         }
1998         return ERR_PTR(rc);
1999 }
2000
2001 struct resource *nsblk_add_resource(struct nd_region *nd_region,
2002                 struct nvdimm_drvdata *ndd, struct nd_namespace_blk *nsblk,
2003                 resource_size_t start)
2004 {
2005         struct nd_label_id label_id;
2006         struct resource *res;
2007
2008         nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
2009         res = krealloc(nsblk->res,
2010                         sizeof(void *) * (nsblk->num_resources + 1),
2011                         GFP_KERNEL);
2012         if (!res)
2013                 return NULL;
2014         nsblk->res = (struct resource **) res;
2015         for_each_dpa_resource(ndd, res)
2016                 if (strcmp(res->name, label_id.id) == 0
2017                                 && res->start == start) {
2018                         nsblk->res[nsblk->num_resources++] = res;
2019                         return res;
2020                 }
2021         return NULL;
2022 }
2023
2024 static struct device *nd_namespace_blk_create(struct nd_region *nd_region)
2025 {
2026         struct nd_namespace_blk *nsblk;
2027         struct device *dev;
2028
2029         if (!is_nd_blk(&nd_region->dev))
2030                 return NULL;
2031
2032         nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
2033         if (!nsblk)
2034                 return NULL;
2035
2036         dev = &nsblk->common.dev;
2037         dev->type = &namespace_blk_device_type;
2038         nsblk->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL);
2039         if (nsblk->id < 0) {
2040                 kfree(nsblk);
2041                 return NULL;
2042         }
2043         dev_set_name(dev, "namespace%d.%d", nd_region->id, nsblk->id);
2044         dev->parent = &nd_region->dev;
2045         dev->groups = nd_namespace_attribute_groups;
2046
2047         return &nsblk->common.dev;
2048 }
2049
2050 static struct device *nd_namespace_pmem_create(struct nd_region *nd_region)
2051 {
2052         struct nd_namespace_pmem *nspm;
2053         struct resource *res;
2054         struct device *dev;
2055
2056         if (!is_memory(&nd_region->dev))
2057                 return NULL;
2058
2059         nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
2060         if (!nspm)
2061                 return NULL;
2062
2063         dev = &nspm->nsio.common.dev;
2064         dev->type = &namespace_pmem_device_type;
2065         dev->parent = &nd_region->dev;
2066         res = &nspm->nsio.res;
2067         res->name = dev_name(&nd_region->dev);
2068         res->flags = IORESOURCE_MEM;
2069
2070         nspm->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL);
2071         if (nspm->id < 0) {
2072                 kfree(nspm);
2073                 return NULL;
2074         }
2075         dev_set_name(dev, "namespace%d.%d", nd_region->id, nspm->id);
2076         dev->parent = &nd_region->dev;
2077         dev->groups = nd_namespace_attribute_groups;
2078         nd_namespace_pmem_set_resource(nd_region, nspm, 0);
2079
2080         return dev;
2081 }
2082
2083 void nd_region_create_ns_seed(struct nd_region *nd_region)
2084 {
2085         WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2086
2087         if (nd_region_to_nstype(nd_region) == ND_DEVICE_NAMESPACE_IO)
2088                 return;
2089
2090         if (is_nd_blk(&nd_region->dev))
2091                 nd_region->ns_seed = nd_namespace_blk_create(nd_region);
2092         else
2093                 nd_region->ns_seed = nd_namespace_pmem_create(nd_region);
2094
2095         /*
2096          * Seed creation failures are not fatal, provisioning is simply
2097          * disabled until memory becomes available
2098          */
2099         if (!nd_region->ns_seed)
2100                 dev_err(&nd_region->dev, "failed to create %s namespace\n",
2101                                 is_nd_blk(&nd_region->dev) ? "blk" : "pmem");
2102         else
2103                 nd_device_register(nd_region->ns_seed);
2104 }
2105
2106 void nd_region_create_dax_seed(struct nd_region *nd_region)
2107 {
2108         WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2109         nd_region->dax_seed = nd_dax_create(nd_region);
2110         /*
2111          * Seed creation failures are not fatal, provisioning is simply
2112          * disabled until memory becomes available
2113          */
2114         if (!nd_region->dax_seed)
2115                 dev_err(&nd_region->dev, "failed to create dax namespace\n");
2116 }
2117
2118 void nd_region_create_pfn_seed(struct nd_region *nd_region)
2119 {
2120         WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2121         nd_region->pfn_seed = nd_pfn_create(nd_region);
2122         /*
2123          * Seed creation failures are not fatal, provisioning is simply
2124          * disabled until memory becomes available
2125          */
2126         if (!nd_region->pfn_seed)
2127                 dev_err(&nd_region->dev, "failed to create pfn namespace\n");
2128 }
2129
2130 void nd_region_create_btt_seed(struct nd_region *nd_region)
2131 {
2132         WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2133         nd_region->btt_seed = nd_btt_create(nd_region);
2134         /*
2135          * Seed creation failures are not fatal, provisioning is simply
2136          * disabled until memory becomes available
2137          */
2138         if (!nd_region->btt_seed)
2139                 dev_err(&nd_region->dev, "failed to create btt namespace\n");
2140 }
2141
2142 static int add_namespace_resource(struct nd_region *nd_region,
2143                 struct nd_namespace_label *nd_label, struct device **devs,
2144                 int count)
2145 {
2146         struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2147         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2148         int i;
2149
2150         for (i = 0; i < count; i++) {
2151                 u8 *uuid = namespace_to_uuid(devs[i]);
2152                 struct resource *res;
2153
2154                 if (IS_ERR_OR_NULL(uuid)) {
2155                         WARN_ON(1);
2156                         continue;
2157                 }
2158
2159                 if (memcmp(uuid, nd_label->uuid, NSLABEL_UUID_LEN) != 0)
2160                         continue;
2161                 if (is_namespace_blk(devs[i])) {
2162                         res = nsblk_add_resource(nd_region, ndd,
2163                                         to_nd_namespace_blk(devs[i]),
2164                                         __le64_to_cpu(nd_label->dpa));
2165                         if (!res)
2166                                 return -ENXIO;
2167                         nd_dbg_dpa(nd_region, ndd, res, "%d assign\n", count);
2168                 } else {
2169                         dev_err(&nd_region->dev,
2170                                         "error: conflicting extents for uuid: %pUb\n",
2171                                         nd_label->uuid);
2172                         return -ENXIO;
2173                 }
2174                 break;
2175         }
2176
2177         return i;
2178 }
2179
2180 struct device *create_namespace_blk(struct nd_region *nd_region,
2181                 struct nd_namespace_label *nd_label, int count)
2182 {
2183
2184         struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2185         struct nd_interleave_set *nd_set = nd_region->nd_set;
2186         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2187         struct nd_namespace_blk *nsblk;
2188         char name[NSLABEL_NAME_LEN];
2189         struct device *dev = NULL;
2190         struct resource *res;
2191
2192         if (namespace_label_has(ndd, type_guid)) {
2193                 if (!guid_equal(&nd_set->type_guid, &nd_label->type_guid)) {
2194                         dev_dbg(ndd->dev, "expect type_guid %pUb got %pUb\n",
2195                                         nd_set->type_guid.b,
2196                                         nd_label->type_guid.b);
2197                         return ERR_PTR(-EAGAIN);
2198                 }
2199
2200                 if (nd_label->isetcookie != __cpu_to_le64(nd_set->cookie2)) {
2201                         dev_dbg(ndd->dev, "expect cookie %#llx got %#llx\n",
2202                                         nd_set->cookie2,
2203                                         __le64_to_cpu(nd_label->isetcookie));
2204                         return ERR_PTR(-EAGAIN);
2205                 }
2206         }
2207
2208         nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
2209         if (!nsblk)
2210                 return ERR_PTR(-ENOMEM);
2211         dev = &nsblk->common.dev;
2212         dev->type = &namespace_blk_device_type;
2213         dev->parent = &nd_region->dev;
2214         nsblk->id = -1;
2215         nsblk->lbasize = __le64_to_cpu(nd_label->lbasize);
2216         nsblk->uuid = kmemdup(nd_label->uuid, NSLABEL_UUID_LEN,
2217                         GFP_KERNEL);
2218         if (namespace_label_has(ndd, abstraction_guid))
2219                 nsblk->common.claim_class
2220                         = to_nvdimm_cclass(&nd_label->abstraction_guid);
2221         if (!nsblk->uuid)
2222                 goto blk_err;
2223         memcpy(name, nd_label->name, NSLABEL_NAME_LEN);
2224         if (name[0])
2225                 nsblk->alt_name = kmemdup(name, NSLABEL_NAME_LEN,
2226                                 GFP_KERNEL);
2227         res = nsblk_add_resource(nd_region, ndd, nsblk,
2228                         __le64_to_cpu(nd_label->dpa));
2229         if (!res)
2230                 goto blk_err;
2231         nd_dbg_dpa(nd_region, ndd, res, "%d: assign\n", count);
2232         return dev;
2233  blk_err:
2234         namespace_blk_release(dev);
2235         return ERR_PTR(-ENXIO);
2236 }
2237
2238 static int cmp_dpa(const void *a, const void *b)
2239 {
2240         const struct device *dev_a = *(const struct device **) a;
2241         const struct device *dev_b = *(const struct device **) b;
2242         struct nd_namespace_blk *nsblk_a, *nsblk_b;
2243         struct nd_namespace_pmem *nspm_a, *nspm_b;
2244
2245         if (is_namespace_io(dev_a))
2246                 return 0;
2247
2248         if (is_namespace_blk(dev_a)) {
2249                 nsblk_a = to_nd_namespace_blk(dev_a);
2250                 nsblk_b = to_nd_namespace_blk(dev_b);
2251
2252                 return memcmp(&nsblk_a->res[0]->start, &nsblk_b->res[0]->start,
2253                                 sizeof(resource_size_t));
2254         }
2255
2256         nspm_a = to_nd_namespace_pmem(dev_a);
2257         nspm_b = to_nd_namespace_pmem(dev_b);
2258
2259         return memcmp(&nspm_a->nsio.res.start, &nspm_b->nsio.res.start,
2260                         sizeof(resource_size_t));
2261 }
2262
2263 static struct device **scan_labels(struct nd_region *nd_region)
2264 {
2265         int i, count = 0;
2266         struct device *dev, **devs = NULL;
2267         struct nd_label_ent *label_ent, *e;
2268         struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2269         resource_size_t map_end = nd_mapping->start + nd_mapping->size - 1;
2270
2271         /* "safe" because create_namespace_pmem() might list_move() label_ent */
2272         list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) {
2273                 struct nd_namespace_label *nd_label = label_ent->label;
2274                 struct device **__devs;
2275                 u32 flags;
2276
2277                 if (!nd_label)
2278                         continue;
2279                 flags = __le32_to_cpu(nd_label->flags);
2280                 if (is_nd_blk(&nd_region->dev)
2281                                 == !!(flags & NSLABEL_FLAG_LOCAL))
2282                         /* pass, region matches label type */;
2283                 else
2284                         continue;
2285
2286                 /* skip labels that describe extents outside of the region */
2287                 if (nd_label->dpa < nd_mapping->start || nd_label->dpa > map_end)
2288                         continue;
2289
2290                 i = add_namespace_resource(nd_region, nd_label, devs, count);
2291                 if (i < 0)
2292                         goto err;
2293                 if (i < count)
2294                         continue;
2295                 __devs = kcalloc(count + 2, sizeof(dev), GFP_KERNEL);
2296                 if (!__devs)
2297                         goto err;
2298                 memcpy(__devs, devs, sizeof(dev) * count);
2299                 kfree(devs);
2300                 devs = __devs;
2301
2302                 if (is_nd_blk(&nd_region->dev))
2303                         dev = create_namespace_blk(nd_region, nd_label, count);
2304                 else {
2305                         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2306                         struct nd_namespace_index *nsindex;
2307
2308                         nsindex = to_namespace_index(ndd, ndd->ns_current);
2309                         dev = create_namespace_pmem(nd_region, nsindex, nd_label);
2310                 }
2311
2312                 if (IS_ERR(dev)) {
2313                         switch (PTR_ERR(dev)) {
2314                         case -EAGAIN:
2315                                 /* skip invalid labels */
2316                                 continue;
2317                         case -ENODEV:
2318                                 /* fallthrough to seed creation */
2319                                 break;
2320                         default:
2321                                 goto err;
2322                         }
2323                 } else
2324                         devs[count++] = dev;
2325
2326         }
2327
2328         dev_dbg(&nd_region->dev, "%s: discovered %d %s namespace%s\n",
2329                         __func__, count, is_nd_blk(&nd_region->dev)
2330                         ? "blk" : "pmem", count == 1 ? "" : "s");
2331
2332         if (count == 0) {
2333                 /* Publish a zero-sized namespace for userspace to configure. */
2334                 nd_mapping_free_labels(nd_mapping);
2335
2336                 devs = kcalloc(2, sizeof(dev), GFP_KERNEL);
2337                 if (!devs)
2338                         goto err;
2339                 if (is_nd_blk(&nd_region->dev)) {
2340                         struct nd_namespace_blk *nsblk;
2341
2342                         nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
2343                         if (!nsblk)
2344                                 goto err;
2345                         dev = &nsblk->common.dev;
2346                         dev->type = &namespace_blk_device_type;
2347                 } else {
2348                         struct nd_namespace_pmem *nspm;
2349
2350                         nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
2351                         if (!nspm)
2352                                 goto err;
2353                         dev = &nspm->nsio.common.dev;
2354                         dev->type = &namespace_pmem_device_type;
2355                         nd_namespace_pmem_set_resource(nd_region, nspm, 0);
2356                 }
2357                 dev->parent = &nd_region->dev;
2358                 devs[count++] = dev;
2359         } else if (is_memory(&nd_region->dev)) {
2360                 /* clean unselected labels */
2361                 for (i = 0; i < nd_region->ndr_mappings; i++) {
2362                         struct list_head *l, *e;
2363                         LIST_HEAD(list);
2364                         int j;
2365
2366                         nd_mapping = &nd_region->mapping[i];
2367                         if (list_empty(&nd_mapping->labels)) {
2368                                 WARN_ON(1);
2369                                 continue;
2370                         }
2371
2372                         j = count;
2373                         list_for_each_safe(l, e, &nd_mapping->labels) {
2374                                 if (!j--)
2375                                         break;
2376                                 list_move_tail(l, &list);
2377                         }
2378                         nd_mapping_free_labels(nd_mapping);
2379                         list_splice_init(&list, &nd_mapping->labels);
2380                 }
2381         }
2382
2383         if (count > 1)
2384                 sort(devs, count, sizeof(struct device *), cmp_dpa, NULL);
2385
2386         return devs;
2387
2388  err:
2389         if (devs) {
2390                 for (i = 0; devs[i]; i++)
2391                         if (is_nd_blk(&nd_region->dev))
2392                                 namespace_blk_release(devs[i]);
2393                         else
2394                                 namespace_pmem_release(devs[i]);
2395                 kfree(devs);
2396         }
2397         return NULL;
2398 }
2399
2400 static struct device **create_namespaces(struct nd_region *nd_region)
2401 {
2402         struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2403         struct device **devs;
2404         int i;
2405
2406         if (nd_region->ndr_mappings == 0)
2407                 return NULL;
2408
2409         /* lock down all mappings while we scan labels */
2410         for (i = 0; i < nd_region->ndr_mappings; i++) {
2411                 nd_mapping = &nd_region->mapping[i];
2412                 mutex_lock_nested(&nd_mapping->lock, i);
2413         }
2414
2415         devs = scan_labels(nd_region);
2416
2417         for (i = 0; i < nd_region->ndr_mappings; i++) {
2418                 int reverse = nd_region->ndr_mappings - 1 - i;
2419
2420                 nd_mapping = &nd_region->mapping[reverse];
2421                 mutex_unlock(&nd_mapping->lock);
2422         }
2423
2424         return devs;
2425 }
2426
2427 static int init_active_labels(struct nd_region *nd_region)
2428 {
2429         int i;
2430
2431         for (i = 0; i < nd_region->ndr_mappings; i++) {
2432                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
2433                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2434                 struct nvdimm *nvdimm = nd_mapping->nvdimm;
2435                 struct nd_label_ent *label_ent;
2436                 int count, j;
2437
2438                 /*
2439                  * If the dimm is disabled then we may need to prevent
2440                  * the region from being activated.
2441                  */
2442                 if (!ndd) {
2443                         if (test_bit(NDD_LOCKED, &nvdimm->flags))
2444                                 /* fail, label data may be unreadable */;
2445                         else if (test_bit(NDD_ALIASING, &nvdimm->flags))
2446                                 /* fail, labels needed to disambiguate dpa */;
2447                         else
2448                                 return 0;
2449
2450                         dev_err(&nd_region->dev, "%s: is %s, failing probe\n",
2451                                         dev_name(&nd_mapping->nvdimm->dev),
2452                                         test_bit(NDD_LOCKED, &nvdimm->flags)
2453                                         ? "locked" : "disabled");
2454                         return -ENXIO;
2455                 }
2456                 nd_mapping->ndd = ndd;
2457                 atomic_inc(&nvdimm->busy);
2458                 get_ndd(ndd);
2459
2460                 count = nd_label_active_count(ndd);
2461                 dev_dbg(ndd->dev, "%s: %d\n", __func__, count);
2462                 if (!count)
2463                         continue;
2464                 for (j = 0; j < count; j++) {
2465                         struct nd_namespace_label *label;
2466
2467                         label_ent = kzalloc(sizeof(*label_ent), GFP_KERNEL);
2468                         if (!label_ent)
2469                                 break;
2470                         label = nd_label_active(ndd, j);
2471                         label_ent->label = label;
2472
2473                         mutex_lock(&nd_mapping->lock);
2474                         list_add_tail(&label_ent->list, &nd_mapping->labels);
2475                         mutex_unlock(&nd_mapping->lock);
2476                 }
2477
2478                 if (j >= count)
2479                         continue;
2480
2481                 mutex_lock(&nd_mapping->lock);
2482                 nd_mapping_free_labels(nd_mapping);
2483                 mutex_unlock(&nd_mapping->lock);
2484                 return -ENOMEM;
2485         }
2486
2487         return 0;
2488 }
2489
2490 int nd_region_register_namespaces(struct nd_region *nd_region, int *err)
2491 {
2492         struct device **devs = NULL;
2493         int i, rc = 0, type;
2494
2495         *err = 0;
2496         nvdimm_bus_lock(&nd_region->dev);
2497         rc = init_active_labels(nd_region);
2498         if (rc) {
2499                 nvdimm_bus_unlock(&nd_region->dev);
2500                 return rc;
2501         }
2502
2503         type = nd_region_to_nstype(nd_region);
2504         switch (type) {
2505         case ND_DEVICE_NAMESPACE_IO:
2506                 devs = create_namespace_io(nd_region);
2507                 break;
2508         case ND_DEVICE_NAMESPACE_PMEM:
2509         case ND_DEVICE_NAMESPACE_BLK:
2510                 devs = create_namespaces(nd_region);
2511                 break;
2512         default:
2513                 break;
2514         }
2515         nvdimm_bus_unlock(&nd_region->dev);
2516
2517         if (!devs)
2518                 return -ENODEV;
2519
2520         for (i = 0; devs[i]; i++) {
2521                 struct device *dev = devs[i];
2522                 int id;
2523
2524                 if (type == ND_DEVICE_NAMESPACE_BLK) {
2525                         struct nd_namespace_blk *nsblk;
2526
2527                         nsblk = to_nd_namespace_blk(dev);
2528                         id = ida_simple_get(&nd_region->ns_ida, 0, 0,
2529                                         GFP_KERNEL);
2530                         nsblk->id = id;
2531                 } else if (type == ND_DEVICE_NAMESPACE_PMEM) {
2532                         struct nd_namespace_pmem *nspm;
2533
2534                         nspm = to_nd_namespace_pmem(dev);
2535                         id = ida_simple_get(&nd_region->ns_ida, 0, 0,
2536                                         GFP_KERNEL);
2537                         nspm->id = id;
2538                 } else
2539                         id = i;
2540
2541                 if (id < 0)
2542                         break;
2543                 dev_set_name(dev, "namespace%d.%d", nd_region->id, id);
2544                 dev->groups = nd_namespace_attribute_groups;
2545                 nd_device_register(dev);
2546         }
2547         if (i)
2548                 nd_region->ns_seed = devs[0];
2549
2550         if (devs[i]) {
2551                 int j;
2552
2553                 for (j = i; devs[j]; j++) {
2554                         struct device *dev = devs[j];
2555
2556                         device_initialize(dev);
2557                         put_device(dev);
2558                 }
2559                 *err = j - i;
2560                 /*
2561                  * All of the namespaces we tried to register failed, so
2562                  * fail region activation.
2563                  */
2564                 if (*err == 0)
2565                         rc = -ENODEV;
2566         }
2567         kfree(devs);
2568
2569         if (rc == -ENODEV)
2570                 return rc;
2571
2572         return i;
2573 }