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(%zd)\n", 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, "not associated with dimm(s)\n");
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, "%llx %s (%d)\n", val, rc < 0 ? "fail" : "success", rc);
1109
1110         nvdimm_bus_unlock(dev);
1111         device_unlock(dev);
1112
1113         return rc < 0 ? rc : len;
1114 }
1115
1116 resource_size_t __nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
1117 {
1118         struct device *dev = &ndns->dev;
1119
1120         if (is_namespace_pmem(dev)) {
1121                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1122
1123                 return resource_size(&nspm->nsio.res);
1124         } else if (is_namespace_blk(dev)) {
1125                 return nd_namespace_blk_size(to_nd_namespace_blk(dev));
1126         } else if (is_namespace_io(dev)) {
1127                 struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
1128
1129                 return resource_size(&nsio->res);
1130         } else
1131                 WARN_ONCE(1, "unknown namespace type\n");
1132         return 0;
1133 }
1134
1135 resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
1136 {
1137         resource_size_t size;
1138
1139         nvdimm_bus_lock(&ndns->dev);
1140         size = __nvdimm_namespace_capacity(ndns);
1141         nvdimm_bus_unlock(&ndns->dev);
1142
1143         return size;
1144 }
1145 EXPORT_SYMBOL(nvdimm_namespace_capacity);
1146
1147 static ssize_t size_show(struct device *dev,
1148                 struct device_attribute *attr, char *buf)
1149 {
1150         return sprintf(buf, "%llu\n", (unsigned long long)
1151                         nvdimm_namespace_capacity(to_ndns(dev)));
1152 }
1153 static DEVICE_ATTR(size, 0444, size_show, size_store);
1154
1155 static u8 *namespace_to_uuid(struct device *dev)
1156 {
1157         if (is_namespace_pmem(dev)) {
1158                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1159
1160                 return nspm->uuid;
1161         } else if (is_namespace_blk(dev)) {
1162                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1163
1164                 return nsblk->uuid;
1165         } else
1166                 return ERR_PTR(-ENXIO);
1167 }
1168
1169 static ssize_t uuid_show(struct device *dev,
1170                 struct device_attribute *attr, char *buf)
1171 {
1172         u8 *uuid = namespace_to_uuid(dev);
1173
1174         if (IS_ERR(uuid))
1175                 return PTR_ERR(uuid);
1176         if (uuid)
1177                 return sprintf(buf, "%pUb\n", uuid);
1178         return sprintf(buf, "\n");
1179 }
1180
1181 /**
1182  * namespace_update_uuid - check for a unique uuid and whether we're "renaming"
1183  * @nd_region: parent region so we can updates all dimms in the set
1184  * @dev: namespace type for generating label_id
1185  * @new_uuid: incoming uuid
1186  * @old_uuid: reference to the uuid storage location in the namespace object
1187  */
1188 static int namespace_update_uuid(struct nd_region *nd_region,
1189                 struct device *dev, u8 *new_uuid, u8 **old_uuid)
1190 {
1191         u32 flags = is_namespace_blk(dev) ? NSLABEL_FLAG_LOCAL : 0;
1192         struct nd_label_id old_label_id;
1193         struct nd_label_id new_label_id;
1194         int i;
1195
1196         if (!nd_is_uuid_unique(dev, new_uuid))
1197                 return -EINVAL;
1198
1199         if (*old_uuid == NULL)
1200                 goto out;
1201
1202         /*
1203          * If we've already written a label with this uuid, then it's
1204          * too late to rename because we can't reliably update the uuid
1205          * without losing the old namespace.  Userspace must delete this
1206          * namespace to abandon the old uuid.
1207          */
1208         for (i = 0; i < nd_region->ndr_mappings; i++) {
1209                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1210
1211                 /*
1212                  * This check by itself is sufficient because old_uuid
1213                  * would be NULL above if this uuid did not exist in the
1214                  * currently written set.
1215                  *
1216                  * FIXME: can we delete uuid with zero dpa allocated?
1217                  */
1218                 if (list_empty(&nd_mapping->labels))
1219                         return -EBUSY;
1220         }
1221
1222         nd_label_gen_id(&old_label_id, *old_uuid, flags);
1223         nd_label_gen_id(&new_label_id, new_uuid, flags);
1224         for (i = 0; i < nd_region->ndr_mappings; i++) {
1225                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1226                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1227                 struct resource *res;
1228
1229                 for_each_dpa_resource(ndd, res)
1230                         if (strcmp(res->name, old_label_id.id) == 0)
1231                                 sprintf((void *) res->name, "%s",
1232                                                 new_label_id.id);
1233         }
1234         kfree(*old_uuid);
1235  out:
1236         *old_uuid = new_uuid;
1237         return 0;
1238 }
1239
1240 static ssize_t uuid_store(struct device *dev,
1241                 struct device_attribute *attr, const char *buf, size_t len)
1242 {
1243         struct nd_region *nd_region = to_nd_region(dev->parent);
1244         u8 *uuid = NULL;
1245         ssize_t rc = 0;
1246         u8 **ns_uuid;
1247
1248         if (is_namespace_pmem(dev)) {
1249                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1250
1251                 ns_uuid = &nspm->uuid;
1252         } else if (is_namespace_blk(dev)) {
1253                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1254
1255                 ns_uuid = &nsblk->uuid;
1256         } else
1257                 return -ENXIO;
1258
1259         device_lock(dev);
1260         nvdimm_bus_lock(dev);
1261         wait_nvdimm_bus_probe_idle(dev);
1262         if (to_ndns(dev)->claim)
1263                 rc = -EBUSY;
1264         if (rc >= 0)
1265                 rc = nd_uuid_store(dev, &uuid, buf, len);
1266         if (rc >= 0)
1267                 rc = namespace_update_uuid(nd_region, dev, uuid, ns_uuid);
1268         if (rc >= 0)
1269                 rc = nd_namespace_label_update(nd_region, dev);
1270         else
1271                 kfree(uuid);
1272         dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
1273                         buf[len - 1] == '\n' ? "" : "\n");
1274         nvdimm_bus_unlock(dev);
1275         device_unlock(dev);
1276
1277         return rc < 0 ? rc : len;
1278 }
1279 static DEVICE_ATTR_RW(uuid);
1280
1281 static ssize_t resource_show(struct device *dev,
1282                 struct device_attribute *attr, char *buf)
1283 {
1284         struct resource *res;
1285
1286         if (is_namespace_pmem(dev)) {
1287                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1288
1289                 res = &nspm->nsio.res;
1290         } else if (is_namespace_io(dev)) {
1291                 struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
1292
1293                 res = &nsio->res;
1294         } else
1295                 return -ENXIO;
1296
1297         /* no address to convey if the namespace has no allocation */
1298         if (resource_size(res) == 0)
1299                 return -ENXIO;
1300         return sprintf(buf, "%#llx\n", (unsigned long long) res->start);
1301 }
1302 static DEVICE_ATTR_RO(resource);
1303
1304 static const unsigned long blk_lbasize_supported[] = { 512, 520, 528,
1305         4096, 4104, 4160, 4224, 0 };
1306
1307 static const unsigned long pmem_lbasize_supported[] = { 512, 4096, 0 };
1308
1309 static ssize_t sector_size_show(struct device *dev,
1310                 struct device_attribute *attr, char *buf)
1311 {
1312         if (is_namespace_blk(dev)) {
1313                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1314
1315                 return nd_size_select_show(nsblk->lbasize,
1316                                 blk_lbasize_supported, buf);
1317         }
1318
1319         if (is_namespace_pmem(dev)) {
1320                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1321
1322                 return nd_size_select_show(nspm->lbasize,
1323                                 pmem_lbasize_supported, buf);
1324         }
1325         return -ENXIO;
1326 }
1327
1328 static ssize_t sector_size_store(struct device *dev,
1329                 struct device_attribute *attr, const char *buf, size_t len)
1330 {
1331         struct nd_region *nd_region = to_nd_region(dev->parent);
1332         const unsigned long *supported;
1333         unsigned long *lbasize;
1334         ssize_t rc = 0;
1335
1336         if (is_namespace_blk(dev)) {
1337                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1338
1339                 lbasize = &nsblk->lbasize;
1340                 supported = blk_lbasize_supported;
1341         } else if (is_namespace_pmem(dev)) {
1342                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1343
1344                 lbasize = &nspm->lbasize;
1345                 supported = pmem_lbasize_supported;
1346         } else
1347                 return -ENXIO;
1348
1349         device_lock(dev);
1350         nvdimm_bus_lock(dev);
1351         if (to_ndns(dev)->claim)
1352                 rc = -EBUSY;
1353         if (rc >= 0)
1354                 rc = nd_size_select_store(dev, buf, lbasize, supported);
1355         if (rc >= 0)
1356                 rc = nd_namespace_label_update(nd_region, dev);
1357         dev_dbg(dev, "result: %zd %s: %s%s", rc, rc < 0 ? "tried" : "wrote",
1358                         buf, buf[len - 1] == '\n' ? "" : "\n");
1359         nvdimm_bus_unlock(dev);
1360         device_unlock(dev);
1361
1362         return rc ? rc : len;
1363 }
1364 static DEVICE_ATTR_RW(sector_size);
1365
1366 static ssize_t dpa_extents_show(struct device *dev,
1367                 struct device_attribute *attr, char *buf)
1368 {
1369         struct nd_region *nd_region = to_nd_region(dev->parent);
1370         struct nd_label_id label_id;
1371         int count = 0, i;
1372         u8 *uuid = NULL;
1373         u32 flags = 0;
1374
1375         nvdimm_bus_lock(dev);
1376         if (is_namespace_pmem(dev)) {
1377                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1378
1379                 uuid = nspm->uuid;
1380                 flags = 0;
1381         } else if (is_namespace_blk(dev)) {
1382                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1383
1384                 uuid = nsblk->uuid;
1385                 flags = NSLABEL_FLAG_LOCAL;
1386         }
1387
1388         if (!uuid)
1389                 goto out;
1390
1391         nd_label_gen_id(&label_id, uuid, flags);
1392         for (i = 0; i < nd_region->ndr_mappings; i++) {
1393                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1394                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1395                 struct resource *res;
1396
1397                 for_each_dpa_resource(ndd, res)
1398                         if (strcmp(res->name, label_id.id) == 0)
1399                                 count++;
1400         }
1401  out:
1402         nvdimm_bus_unlock(dev);
1403
1404         return sprintf(buf, "%d\n", count);
1405 }
1406 static DEVICE_ATTR_RO(dpa_extents);
1407
1408 static int btt_claim_class(struct device *dev)
1409 {
1410         struct nd_region *nd_region = to_nd_region(dev->parent);
1411         int i, loop_bitmask = 0;
1412
1413         for (i = 0; i < nd_region->ndr_mappings; i++) {
1414                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1415                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1416                 struct nd_namespace_index *nsindex;
1417
1418                 /*
1419                  * If any of the DIMMs do not support labels the only
1420                  * possible BTT format is v1.
1421                  */
1422                 if (!ndd) {
1423                         loop_bitmask = 0;
1424                         break;
1425                 }
1426
1427                 nsindex = to_namespace_index(ndd, ndd->ns_current);
1428                 if (nsindex == NULL)
1429                         loop_bitmask |= 1;
1430                 else {
1431                         /* check whether existing labels are v1.1 or v1.2 */
1432                         if (__le16_to_cpu(nsindex->major) == 1
1433                                         && __le16_to_cpu(nsindex->minor) == 1)
1434                                 loop_bitmask |= 2;
1435                         else
1436                                 loop_bitmask |= 4;
1437                 }
1438         }
1439         /*
1440          * If nsindex is null loop_bitmask's bit 0 will be set, and if an index
1441          * block is found, a v1.1 label for any mapping will set bit 1, and a
1442          * v1.2 label will set bit 2.
1443          *
1444          * At the end of the loop, at most one of the three bits must be set.
1445          * If multiple bits were set, it means the different mappings disagree
1446          * about their labels, and this must be cleaned up first.
1447          *
1448          * If all the label index blocks are found to agree, nsindex of NULL
1449          * implies labels haven't been initialized yet, and when they will,
1450          * they will be of the 1.2 format, so we can assume BTT2.0
1451          *
1452          * If 1.1 labels are found, we enforce BTT1.1, and if 1.2 labels are
1453          * found, we enforce BTT2.0
1454          *
1455          * If the loop was never entered, default to BTT1.1 (legacy namespaces)
1456          */
1457         switch (loop_bitmask) {
1458         case 0:
1459         case 2:
1460                 return NVDIMM_CCLASS_BTT;
1461         case 1:
1462         case 4:
1463                 return NVDIMM_CCLASS_BTT2;
1464         default:
1465                 return -ENXIO;
1466         }
1467 }
1468
1469 static ssize_t holder_show(struct device *dev,
1470                 struct device_attribute *attr, char *buf)
1471 {
1472         struct nd_namespace_common *ndns = to_ndns(dev);
1473         ssize_t rc;
1474
1475         device_lock(dev);
1476         rc = sprintf(buf, "%s\n", ndns->claim ? dev_name(ndns->claim) : "");
1477         device_unlock(dev);
1478
1479         return rc;
1480 }
1481 static DEVICE_ATTR_RO(holder);
1482
1483 static ssize_t __holder_class_store(struct device *dev, const char *buf)
1484 {
1485         struct nd_namespace_common *ndns = to_ndns(dev);
1486
1487         if (dev->driver || ndns->claim)
1488                 return -EBUSY;
1489
1490         if (strcmp(buf, "btt") == 0 || strcmp(buf, "btt\n") == 0)
1491                 ndns->claim_class = btt_claim_class(dev);
1492         else if (strcmp(buf, "pfn") == 0 || strcmp(buf, "pfn\n") == 0)
1493                 ndns->claim_class = NVDIMM_CCLASS_PFN;
1494         else if (strcmp(buf, "dax") == 0 || strcmp(buf, "dax\n") == 0)
1495                 ndns->claim_class = NVDIMM_CCLASS_DAX;
1496         else if (strcmp(buf, "") == 0 || strcmp(buf, "\n") == 0)
1497                 ndns->claim_class = NVDIMM_CCLASS_NONE;
1498         else
1499                 return -EINVAL;
1500
1501         /* btt_claim_class() could've returned an error */
1502         if (ndns->claim_class < 0)
1503                 return ndns->claim_class;
1504
1505         return 0;
1506 }
1507
1508 static ssize_t holder_class_store(struct device *dev,
1509                 struct device_attribute *attr, const char *buf, size_t len)
1510 {
1511         struct nd_region *nd_region = to_nd_region(dev->parent);
1512         ssize_t rc;
1513
1514         device_lock(dev);
1515         nvdimm_bus_lock(dev);
1516         wait_nvdimm_bus_probe_idle(dev);
1517         rc = __holder_class_store(dev, buf);
1518         if (rc >= 0)
1519                 rc = nd_namespace_label_update(nd_region, dev);
1520         dev_dbg(dev, "%s(%zd)\n", rc < 0 ? "fail " : "", rc);
1521         nvdimm_bus_unlock(dev);
1522         device_unlock(dev);
1523
1524         return rc < 0 ? rc : len;
1525 }
1526
1527 static ssize_t holder_class_show(struct device *dev,
1528                 struct device_attribute *attr, char *buf)
1529 {
1530         struct nd_namespace_common *ndns = to_ndns(dev);
1531         ssize_t rc;
1532
1533         device_lock(dev);
1534         if (ndns->claim_class == NVDIMM_CCLASS_NONE)
1535                 rc = sprintf(buf, "\n");
1536         else if ((ndns->claim_class == NVDIMM_CCLASS_BTT) ||
1537                         (ndns->claim_class == NVDIMM_CCLASS_BTT2))
1538                 rc = sprintf(buf, "btt\n");
1539         else if (ndns->claim_class == NVDIMM_CCLASS_PFN)
1540                 rc = sprintf(buf, "pfn\n");
1541         else if (ndns->claim_class == NVDIMM_CCLASS_DAX)
1542                 rc = sprintf(buf, "dax\n");
1543         else
1544                 rc = sprintf(buf, "<unknown>\n");
1545         device_unlock(dev);
1546
1547         return rc;
1548 }
1549 static DEVICE_ATTR_RW(holder_class);
1550
1551 static ssize_t mode_show(struct device *dev,
1552                 struct device_attribute *attr, char *buf)
1553 {
1554         struct nd_namespace_common *ndns = to_ndns(dev);
1555         struct device *claim;
1556         char *mode;
1557         ssize_t rc;
1558
1559         device_lock(dev);
1560         claim = ndns->claim;
1561         if (claim && is_nd_btt(claim))
1562                 mode = "safe";
1563         else if (claim && is_nd_pfn(claim))
1564                 mode = "memory";
1565         else if (claim && is_nd_dax(claim))
1566                 mode = "dax";
1567         else if (!claim && pmem_should_map_pages(dev))
1568                 mode = "memory";
1569         else
1570                 mode = "raw";
1571         rc = sprintf(buf, "%s\n", mode);
1572         device_unlock(dev);
1573
1574         return rc;
1575 }
1576 static DEVICE_ATTR_RO(mode);
1577
1578 static ssize_t force_raw_store(struct device *dev,
1579                 struct device_attribute *attr, const char *buf, size_t len)
1580 {
1581         bool force_raw;
1582         int rc = strtobool(buf, &force_raw);
1583
1584         if (rc)
1585                 return rc;
1586
1587         to_ndns(dev)->force_raw = force_raw;
1588         return len;
1589 }
1590
1591 static ssize_t force_raw_show(struct device *dev,
1592                 struct device_attribute *attr, char *buf)
1593 {
1594         return sprintf(buf, "%d\n", to_ndns(dev)->force_raw);
1595 }
1596 static DEVICE_ATTR_RW(force_raw);
1597
1598 static struct attribute *nd_namespace_attributes[] = {
1599         &dev_attr_nstype.attr,
1600         &dev_attr_size.attr,
1601         &dev_attr_mode.attr,
1602         &dev_attr_uuid.attr,
1603         &dev_attr_holder.attr,
1604         &dev_attr_resource.attr,
1605         &dev_attr_alt_name.attr,
1606         &dev_attr_force_raw.attr,
1607         &dev_attr_sector_size.attr,
1608         &dev_attr_dpa_extents.attr,
1609         &dev_attr_holder_class.attr,
1610         NULL,
1611 };
1612
1613 static umode_t namespace_visible(struct kobject *kobj,
1614                 struct attribute *a, int n)
1615 {
1616         struct device *dev = container_of(kobj, struct device, kobj);
1617
1618         if (a == &dev_attr_resource.attr) {
1619                 if (is_namespace_blk(dev))
1620                         return 0;
1621                 return 0400;
1622         }
1623
1624         if (is_namespace_pmem(dev) || is_namespace_blk(dev)) {
1625                 if (a == &dev_attr_size.attr)
1626                         return 0644;
1627
1628                 return a->mode;
1629         }
1630
1631         if (a == &dev_attr_nstype.attr || a == &dev_attr_size.attr
1632                         || a == &dev_attr_holder.attr
1633                         || a == &dev_attr_holder_class.attr
1634                         || a == &dev_attr_force_raw.attr
1635                         || a == &dev_attr_mode.attr)
1636                 return a->mode;
1637
1638         return 0;
1639 }
1640
1641 static struct attribute_group nd_namespace_attribute_group = {
1642         .attrs = nd_namespace_attributes,
1643         .is_visible = namespace_visible,
1644 };
1645
1646 static const struct attribute_group *nd_namespace_attribute_groups[] = {
1647         &nd_device_attribute_group,
1648         &nd_namespace_attribute_group,
1649         &nd_numa_attribute_group,
1650         NULL,
1651 };
1652
1653 struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev)
1654 {
1655         struct nd_btt *nd_btt = is_nd_btt(dev) ? to_nd_btt(dev) : NULL;
1656         struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL;
1657         struct nd_dax *nd_dax = is_nd_dax(dev) ? to_nd_dax(dev) : NULL;
1658         struct nd_namespace_common *ndns = NULL;
1659         resource_size_t size;
1660
1661         if (nd_btt || nd_pfn || nd_dax) {
1662                 if (nd_btt)
1663                         ndns = nd_btt->ndns;
1664                 else if (nd_pfn)
1665                         ndns = nd_pfn->ndns;
1666                 else if (nd_dax)
1667                         ndns = nd_dax->nd_pfn.ndns;
1668
1669                 if (!ndns)
1670                         return ERR_PTR(-ENODEV);
1671
1672                 /*
1673                  * Flush any in-progess probes / removals in the driver
1674                  * for the raw personality of this namespace.
1675                  */
1676                 device_lock(&ndns->dev);
1677                 device_unlock(&ndns->dev);
1678                 if (ndns->dev.driver) {
1679                         dev_dbg(&ndns->dev, "is active, can't bind %s\n",
1680                                         dev_name(dev));
1681                         return ERR_PTR(-EBUSY);
1682                 }
1683                 if (dev_WARN_ONCE(&ndns->dev, ndns->claim != dev,
1684                                         "host (%s) vs claim (%s) mismatch\n",
1685                                         dev_name(dev),
1686                                         dev_name(ndns->claim)))
1687                         return ERR_PTR(-ENXIO);
1688         } else {
1689                 ndns = to_ndns(dev);
1690                 if (ndns->claim) {
1691                         dev_dbg(dev, "claimed by %s, failing probe\n",
1692                                 dev_name(ndns->claim));
1693
1694                         return ERR_PTR(-ENXIO);
1695                 }
1696         }
1697
1698         size = nvdimm_namespace_capacity(ndns);
1699         if (size < ND_MIN_NAMESPACE_SIZE) {
1700                 dev_dbg(&ndns->dev, "%pa, too small must be at least %#x\n",
1701                                 &size, ND_MIN_NAMESPACE_SIZE);
1702                 return ERR_PTR(-ENODEV);
1703         }
1704
1705         if (is_namespace_pmem(&ndns->dev)) {
1706                 struct nd_namespace_pmem *nspm;
1707
1708                 nspm = to_nd_namespace_pmem(&ndns->dev);
1709                 if (uuid_not_set(nspm->uuid, &ndns->dev, __func__))
1710                         return ERR_PTR(-ENODEV);
1711         } else if (is_namespace_blk(&ndns->dev)) {
1712                 struct nd_namespace_blk *nsblk;
1713
1714                 nsblk = to_nd_namespace_blk(&ndns->dev);
1715                 if (uuid_not_set(nsblk->uuid, &ndns->dev, __func__))
1716                         return ERR_PTR(-ENODEV);
1717                 if (!nsblk->lbasize) {
1718                         dev_dbg(&ndns->dev, "sector size not set\n");
1719                         return ERR_PTR(-ENODEV);
1720                 }
1721                 if (!nd_namespace_blk_validate(nsblk))
1722                         return ERR_PTR(-ENODEV);
1723         }
1724
1725         return ndns;
1726 }
1727 EXPORT_SYMBOL(nvdimm_namespace_common_probe);
1728
1729 static struct device **create_namespace_io(struct nd_region *nd_region)
1730 {
1731         struct nd_namespace_io *nsio;
1732         struct device *dev, **devs;
1733         struct resource *res;
1734
1735         nsio = kzalloc(sizeof(*nsio), GFP_KERNEL);
1736         if (!nsio)
1737                 return NULL;
1738
1739         devs = kcalloc(2, sizeof(struct device *), GFP_KERNEL);
1740         if (!devs) {
1741                 kfree(nsio);
1742                 return NULL;
1743         }
1744
1745         dev = &nsio->common.dev;
1746         dev->type = &namespace_io_device_type;
1747         dev->parent = &nd_region->dev;
1748         res = &nsio->res;
1749         res->name = dev_name(&nd_region->dev);
1750         res->flags = IORESOURCE_MEM;
1751         res->start = nd_region->ndr_start;
1752         res->end = res->start + nd_region->ndr_size - 1;
1753
1754         devs[0] = dev;
1755         return devs;
1756 }
1757
1758 static bool has_uuid_at_pos(struct nd_region *nd_region, u8 *uuid,
1759                 u64 cookie, u16 pos)
1760 {
1761         struct nd_namespace_label *found = NULL;
1762         int i;
1763
1764         for (i = 0; i < nd_region->ndr_mappings; i++) {
1765                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1766                 struct nd_interleave_set *nd_set = nd_region->nd_set;
1767                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1768                 struct nd_label_ent *label_ent;
1769                 bool found_uuid = false;
1770
1771                 list_for_each_entry(label_ent, &nd_mapping->labels, list) {
1772                         struct nd_namespace_label *nd_label = label_ent->label;
1773                         u16 position, nlabel;
1774                         u64 isetcookie;
1775
1776                         if (!nd_label)
1777                                 continue;
1778                         isetcookie = __le64_to_cpu(nd_label->isetcookie);
1779                         position = __le16_to_cpu(nd_label->position);
1780                         nlabel = __le16_to_cpu(nd_label->nlabel);
1781
1782                         if (isetcookie != cookie)
1783                                 continue;
1784
1785                         if (memcmp(nd_label->uuid, uuid, NSLABEL_UUID_LEN) != 0)
1786                                 continue;
1787
1788                         if (namespace_label_has(ndd, type_guid)
1789                                         && !guid_equal(&nd_set->type_guid,
1790                                                 &nd_label->type_guid)) {
1791                                 dev_dbg(ndd->dev, "expect type_guid %pUb got %pUb\n",
1792                                                 nd_set->type_guid.b,
1793                                                 nd_label->type_guid.b);
1794                                 continue;
1795                         }
1796
1797                         if (found_uuid) {
1798                                 dev_dbg(ndd->dev, "duplicate entry for uuid\n");
1799                                 return false;
1800                         }
1801                         found_uuid = true;
1802                         if (nlabel != nd_region->ndr_mappings)
1803                                 continue;
1804                         if (position != pos)
1805                                 continue;
1806                         found = nd_label;
1807                         break;
1808                 }
1809                 if (found)
1810                         break;
1811         }
1812         return found != NULL;
1813 }
1814
1815 static int select_pmem_id(struct nd_region *nd_region, u8 *pmem_id)
1816 {
1817         int i;
1818
1819         if (!pmem_id)
1820                 return -ENODEV;
1821
1822         for (i = 0; i < nd_region->ndr_mappings; i++) {
1823                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1824                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1825                 struct nd_namespace_label *nd_label = NULL;
1826                 u64 hw_start, hw_end, pmem_start, pmem_end;
1827                 struct nd_label_ent *label_ent;
1828
1829                 lockdep_assert_held(&nd_mapping->lock);
1830                 list_for_each_entry(label_ent, &nd_mapping->labels, list) {
1831                         nd_label = label_ent->label;
1832                         if (!nd_label)
1833                                 continue;
1834                         if (memcmp(nd_label->uuid, pmem_id, NSLABEL_UUID_LEN) == 0)
1835                                 break;
1836                         nd_label = NULL;
1837                 }
1838
1839                 if (!nd_label) {
1840                         WARN_ON(1);
1841                         return -EINVAL;
1842                 }
1843
1844                 /*
1845                  * Check that this label is compliant with the dpa
1846                  * range published in NFIT
1847                  */
1848                 hw_start = nd_mapping->start;
1849                 hw_end = hw_start + nd_mapping->size;
1850                 pmem_start = __le64_to_cpu(nd_label->dpa);
1851                 pmem_end = pmem_start + __le64_to_cpu(nd_label->rawsize);
1852                 if (pmem_start >= hw_start && pmem_start < hw_end
1853                                 && pmem_end <= hw_end && pmem_end > hw_start)
1854                         /* pass */;
1855                 else {
1856                         dev_dbg(&nd_region->dev, "%s invalid label for %pUb\n",
1857                                         dev_name(ndd->dev), nd_label->uuid);
1858                         return -EINVAL;
1859                 }
1860
1861                 /* move recently validated label to the front of the list */
1862                 list_move(&label_ent->list, &nd_mapping->labels);
1863         }
1864         return 0;
1865 }
1866
1867 /**
1868  * create_namespace_pmem - validate interleave set labelling, retrieve label0
1869  * @nd_region: region with mappings to validate
1870  * @nspm: target namespace to create
1871  * @nd_label: target pmem namespace label to evaluate
1872  */
1873 static struct device *create_namespace_pmem(struct nd_region *nd_region,
1874                 struct nd_namespace_index *nsindex,
1875                 struct nd_namespace_label *nd_label)
1876 {
1877         u64 cookie = nd_region_interleave_set_cookie(nd_region, nsindex);
1878         u64 altcookie = nd_region_interleave_set_altcookie(nd_region);
1879         struct nd_label_ent *label_ent;
1880         struct nd_namespace_pmem *nspm;
1881         struct nd_mapping *nd_mapping;
1882         resource_size_t size = 0;
1883         struct resource *res;
1884         struct device *dev;
1885         int rc = 0;
1886         u16 i;
1887
1888         if (cookie == 0) {
1889                 dev_dbg(&nd_region->dev, "invalid interleave-set-cookie\n");
1890                 return ERR_PTR(-ENXIO);
1891         }
1892
1893         if (__le64_to_cpu(nd_label->isetcookie) != cookie) {
1894                 dev_dbg(&nd_region->dev, "invalid cookie in label: %pUb\n",
1895                                 nd_label->uuid);
1896                 if (__le64_to_cpu(nd_label->isetcookie) != altcookie)
1897                         return ERR_PTR(-EAGAIN);
1898
1899                 dev_dbg(&nd_region->dev, "valid altcookie in label: %pUb\n",
1900                                 nd_label->uuid);
1901         }
1902
1903         nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
1904         if (!nspm)
1905                 return ERR_PTR(-ENOMEM);
1906
1907         nspm->id = -1;
1908         dev = &nspm->nsio.common.dev;
1909         dev->type = &namespace_pmem_device_type;
1910         dev->parent = &nd_region->dev;
1911         res = &nspm->nsio.res;
1912         res->name = dev_name(&nd_region->dev);
1913         res->flags = IORESOURCE_MEM;
1914
1915         for (i = 0; i < nd_region->ndr_mappings; i++) {
1916                 if (has_uuid_at_pos(nd_region, nd_label->uuid, cookie, i))
1917                         continue;
1918                 if (has_uuid_at_pos(nd_region, nd_label->uuid, altcookie, i))
1919                         continue;
1920                 break;
1921         }
1922
1923         if (i < nd_region->ndr_mappings) {
1924                 struct nvdimm *nvdimm = nd_region->mapping[i].nvdimm;
1925
1926                 /*
1927                  * Give up if we don't find an instance of a uuid at each
1928                  * position (from 0 to nd_region->ndr_mappings - 1), or if we
1929                  * find a dimm with two instances of the same uuid.
1930                  */
1931                 dev_err(&nd_region->dev, "%s missing label for %pUb\n",
1932                                 nvdimm_name(nvdimm), nd_label->uuid);
1933                 rc = -EINVAL;
1934                 goto err;
1935         }
1936
1937         /*
1938          * Fix up each mapping's 'labels' to have the validated pmem label for
1939          * that position at labels[0], and NULL at labels[1].  In the process,
1940          * check that the namespace aligns with interleave-set.  We know
1941          * that it does not overlap with any blk namespaces by virtue of
1942          * the dimm being enabled (i.e. nd_label_reserve_dpa()
1943          * succeeded).
1944          */
1945         rc = select_pmem_id(nd_region, nd_label->uuid);
1946         if (rc)
1947                 goto err;
1948
1949         /* Calculate total size and populate namespace properties from label0 */
1950         for (i = 0; i < nd_region->ndr_mappings; i++) {
1951                 struct nd_namespace_label *label0;
1952                 struct nvdimm_drvdata *ndd;
1953
1954                 nd_mapping = &nd_region->mapping[i];
1955                 label_ent = list_first_entry_or_null(&nd_mapping->labels,
1956                                 typeof(*label_ent), list);
1957                 label0 = label_ent ? label_ent->label : 0;
1958
1959                 if (!label0) {
1960                         WARN_ON(1);
1961                         continue;
1962                 }
1963
1964                 size += __le64_to_cpu(label0->rawsize);
1965                 if (__le16_to_cpu(label0->position) != 0)
1966                         continue;
1967                 WARN_ON(nspm->alt_name || nspm->uuid);
1968                 nspm->alt_name = kmemdup((void __force *) label0->name,
1969                                 NSLABEL_NAME_LEN, GFP_KERNEL);
1970                 nspm->uuid = kmemdup((void __force *) label0->uuid,
1971                                 NSLABEL_UUID_LEN, GFP_KERNEL);
1972                 nspm->lbasize = __le64_to_cpu(label0->lbasize);
1973                 ndd = to_ndd(nd_mapping);
1974                 if (namespace_label_has(ndd, abstraction_guid))
1975                         nspm->nsio.common.claim_class
1976                                 = to_nvdimm_cclass(&label0->abstraction_guid);
1977
1978         }
1979
1980         if (!nspm->alt_name || !nspm->uuid) {
1981                 rc = -ENOMEM;
1982                 goto err;
1983         }
1984
1985         nd_namespace_pmem_set_resource(nd_region, nspm, size);
1986
1987         return dev;
1988  err:
1989         namespace_pmem_release(dev);
1990         switch (rc) {
1991         case -EINVAL:
1992                 dev_dbg(&nd_region->dev, "invalid label(s)\n");
1993                 break;
1994         case -ENODEV:
1995                 dev_dbg(&nd_region->dev, "label not found\n");
1996                 break;
1997         default:
1998                 dev_dbg(&nd_region->dev, "unexpected err: %d\n", rc);
1999                 break;
2000         }
2001         return ERR_PTR(rc);
2002 }
2003
2004 struct resource *nsblk_add_resource(struct nd_region *nd_region,
2005                 struct nvdimm_drvdata *ndd, struct nd_namespace_blk *nsblk,
2006                 resource_size_t start)
2007 {
2008         struct nd_label_id label_id;
2009         struct resource *res;
2010
2011         nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
2012         res = krealloc(nsblk->res,
2013                         sizeof(void *) * (nsblk->num_resources + 1),
2014                         GFP_KERNEL);
2015         if (!res)
2016                 return NULL;
2017         nsblk->res = (struct resource **) res;
2018         for_each_dpa_resource(ndd, res)
2019                 if (strcmp(res->name, label_id.id) == 0
2020                                 && res->start == start) {
2021                         nsblk->res[nsblk->num_resources++] = res;
2022                         return res;
2023                 }
2024         return NULL;
2025 }
2026
2027 static struct device *nd_namespace_blk_create(struct nd_region *nd_region)
2028 {
2029         struct nd_namespace_blk *nsblk;
2030         struct device *dev;
2031
2032         if (!is_nd_blk(&nd_region->dev))
2033                 return NULL;
2034
2035         nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
2036         if (!nsblk)
2037                 return NULL;
2038
2039         dev = &nsblk->common.dev;
2040         dev->type = &namespace_blk_device_type;
2041         nsblk->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL);
2042         if (nsblk->id < 0) {
2043                 kfree(nsblk);
2044                 return NULL;
2045         }
2046         dev_set_name(dev, "namespace%d.%d", nd_region->id, nsblk->id);
2047         dev->parent = &nd_region->dev;
2048         dev->groups = nd_namespace_attribute_groups;
2049
2050         return &nsblk->common.dev;
2051 }
2052
2053 static struct device *nd_namespace_pmem_create(struct nd_region *nd_region)
2054 {
2055         struct nd_namespace_pmem *nspm;
2056         struct resource *res;
2057         struct device *dev;
2058
2059         if (!is_memory(&nd_region->dev))
2060                 return NULL;
2061
2062         nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
2063         if (!nspm)
2064                 return NULL;
2065
2066         dev = &nspm->nsio.common.dev;
2067         dev->type = &namespace_pmem_device_type;
2068         dev->parent = &nd_region->dev;
2069         res = &nspm->nsio.res;
2070         res->name = dev_name(&nd_region->dev);
2071         res->flags = IORESOURCE_MEM;
2072
2073         nspm->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL);
2074         if (nspm->id < 0) {
2075                 kfree(nspm);
2076                 return NULL;
2077         }
2078         dev_set_name(dev, "namespace%d.%d", nd_region->id, nspm->id);
2079         dev->parent = &nd_region->dev;
2080         dev->groups = nd_namespace_attribute_groups;
2081         nd_namespace_pmem_set_resource(nd_region, nspm, 0);
2082
2083         return dev;
2084 }
2085
2086 void nd_region_create_ns_seed(struct nd_region *nd_region)
2087 {
2088         WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2089
2090         if (nd_region_to_nstype(nd_region) == ND_DEVICE_NAMESPACE_IO)
2091                 return;
2092
2093         if (is_nd_blk(&nd_region->dev))
2094                 nd_region->ns_seed = nd_namespace_blk_create(nd_region);
2095         else
2096                 nd_region->ns_seed = nd_namespace_pmem_create(nd_region);
2097
2098         /*
2099          * Seed creation failures are not fatal, provisioning is simply
2100          * disabled until memory becomes available
2101          */
2102         if (!nd_region->ns_seed)
2103                 dev_err(&nd_region->dev, "failed to create %s namespace\n",
2104                                 is_nd_blk(&nd_region->dev) ? "blk" : "pmem");
2105         else
2106                 nd_device_register(nd_region->ns_seed);
2107 }
2108
2109 void nd_region_create_dax_seed(struct nd_region *nd_region)
2110 {
2111         WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2112         nd_region->dax_seed = nd_dax_create(nd_region);
2113         /*
2114          * Seed creation failures are not fatal, provisioning is simply
2115          * disabled until memory becomes available
2116          */
2117         if (!nd_region->dax_seed)
2118                 dev_err(&nd_region->dev, "failed to create dax namespace\n");
2119 }
2120
2121 void nd_region_create_pfn_seed(struct nd_region *nd_region)
2122 {
2123         WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2124         nd_region->pfn_seed = nd_pfn_create(nd_region);
2125         /*
2126          * Seed creation failures are not fatal, provisioning is simply
2127          * disabled until memory becomes available
2128          */
2129         if (!nd_region->pfn_seed)
2130                 dev_err(&nd_region->dev, "failed to create pfn namespace\n");
2131 }
2132
2133 void nd_region_create_btt_seed(struct nd_region *nd_region)
2134 {
2135         WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2136         nd_region->btt_seed = nd_btt_create(nd_region);
2137         /*
2138          * Seed creation failures are not fatal, provisioning is simply
2139          * disabled until memory becomes available
2140          */
2141         if (!nd_region->btt_seed)
2142                 dev_err(&nd_region->dev, "failed to create btt namespace\n");
2143 }
2144
2145 static int add_namespace_resource(struct nd_region *nd_region,
2146                 struct nd_namespace_label *nd_label, struct device **devs,
2147                 int count)
2148 {
2149         struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2150         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2151         int i;
2152
2153         for (i = 0; i < count; i++) {
2154                 u8 *uuid = namespace_to_uuid(devs[i]);
2155                 struct resource *res;
2156
2157                 if (IS_ERR_OR_NULL(uuid)) {
2158                         WARN_ON(1);
2159                         continue;
2160                 }
2161
2162                 if (memcmp(uuid, nd_label->uuid, NSLABEL_UUID_LEN) != 0)
2163                         continue;
2164                 if (is_namespace_blk(devs[i])) {
2165                         res = nsblk_add_resource(nd_region, ndd,
2166                                         to_nd_namespace_blk(devs[i]),
2167                                         __le64_to_cpu(nd_label->dpa));
2168                         if (!res)
2169                                 return -ENXIO;
2170                         nd_dbg_dpa(nd_region, ndd, res, "%d assign\n", count);
2171                 } else {
2172                         dev_err(&nd_region->dev,
2173                                         "error: conflicting extents for uuid: %pUb\n",
2174                                         nd_label->uuid);
2175                         return -ENXIO;
2176                 }
2177                 break;
2178         }
2179
2180         return i;
2181 }
2182
2183 static struct device *create_namespace_blk(struct nd_region *nd_region,
2184                 struct nd_namespace_label *nd_label, int count)
2185 {
2186
2187         struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2188         struct nd_interleave_set *nd_set = nd_region->nd_set;
2189         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2190         struct nd_namespace_blk *nsblk;
2191         char name[NSLABEL_NAME_LEN];
2192         struct device *dev = NULL;
2193         struct resource *res;
2194
2195         if (namespace_label_has(ndd, type_guid)) {
2196                 if (!guid_equal(&nd_set->type_guid, &nd_label->type_guid)) {
2197                         dev_dbg(ndd->dev, "expect type_guid %pUb got %pUb\n",
2198                                         nd_set->type_guid.b,
2199                                         nd_label->type_guid.b);
2200                         return ERR_PTR(-EAGAIN);
2201                 }
2202
2203                 if (nd_label->isetcookie != __cpu_to_le64(nd_set->cookie2)) {
2204                         dev_dbg(ndd->dev, "expect cookie %#llx got %#llx\n",
2205                                         nd_set->cookie2,
2206                                         __le64_to_cpu(nd_label->isetcookie));
2207                         return ERR_PTR(-EAGAIN);
2208                 }
2209         }
2210
2211         nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
2212         if (!nsblk)
2213                 return ERR_PTR(-ENOMEM);
2214         dev = &nsblk->common.dev;
2215         dev->type = &namespace_blk_device_type;
2216         dev->parent = &nd_region->dev;
2217         nsblk->id = -1;
2218         nsblk->lbasize = __le64_to_cpu(nd_label->lbasize);
2219         nsblk->uuid = kmemdup(nd_label->uuid, NSLABEL_UUID_LEN,
2220                         GFP_KERNEL);
2221         if (namespace_label_has(ndd, abstraction_guid))
2222                 nsblk->common.claim_class
2223                         = to_nvdimm_cclass(&nd_label->abstraction_guid);
2224         if (!nsblk->uuid)
2225                 goto blk_err;
2226         memcpy(name, nd_label->name, NSLABEL_NAME_LEN);
2227         if (name[0])
2228                 nsblk->alt_name = kmemdup(name, NSLABEL_NAME_LEN,
2229                                 GFP_KERNEL);
2230         res = nsblk_add_resource(nd_region, ndd, nsblk,
2231                         __le64_to_cpu(nd_label->dpa));
2232         if (!res)
2233                 goto blk_err;
2234         nd_dbg_dpa(nd_region, ndd, res, "%d: assign\n", count);
2235         return dev;
2236  blk_err:
2237         namespace_blk_release(dev);
2238         return ERR_PTR(-ENXIO);
2239 }
2240
2241 static int cmp_dpa(const void *a, const void *b)
2242 {
2243         const struct device *dev_a = *(const struct device **) a;
2244         const struct device *dev_b = *(const struct device **) b;
2245         struct nd_namespace_blk *nsblk_a, *nsblk_b;
2246         struct nd_namespace_pmem *nspm_a, *nspm_b;
2247
2248         if (is_namespace_io(dev_a))
2249                 return 0;
2250
2251         if (is_namespace_blk(dev_a)) {
2252                 nsblk_a = to_nd_namespace_blk(dev_a);
2253                 nsblk_b = to_nd_namespace_blk(dev_b);
2254
2255                 return memcmp(&nsblk_a->res[0]->start, &nsblk_b->res[0]->start,
2256                                 sizeof(resource_size_t));
2257         }
2258
2259         nspm_a = to_nd_namespace_pmem(dev_a);
2260         nspm_b = to_nd_namespace_pmem(dev_b);
2261
2262         return memcmp(&nspm_a->nsio.res.start, &nspm_b->nsio.res.start,
2263                         sizeof(resource_size_t));
2264 }
2265
2266 static struct device **scan_labels(struct nd_region *nd_region)
2267 {
2268         int i, count = 0;
2269         struct device *dev, **devs = NULL;
2270         struct nd_label_ent *label_ent, *e;
2271         struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2272         resource_size_t map_end = nd_mapping->start + nd_mapping->size - 1;
2273
2274         /* "safe" because create_namespace_pmem() might list_move() label_ent */
2275         list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) {
2276                 struct nd_namespace_label *nd_label = label_ent->label;
2277                 struct device **__devs;
2278                 u32 flags;
2279
2280                 if (!nd_label)
2281                         continue;
2282                 flags = __le32_to_cpu(nd_label->flags);
2283                 if (is_nd_blk(&nd_region->dev)
2284                                 == !!(flags & NSLABEL_FLAG_LOCAL))
2285                         /* pass, region matches label type */;
2286                 else
2287                         continue;
2288
2289                 /* skip labels that describe extents outside of the region */
2290                 if (nd_label->dpa < nd_mapping->start || nd_label->dpa > map_end)
2291                         continue;
2292
2293                 i = add_namespace_resource(nd_region, nd_label, devs, count);
2294                 if (i < 0)
2295                         goto err;
2296                 if (i < count)
2297                         continue;
2298                 __devs = kcalloc(count + 2, sizeof(dev), GFP_KERNEL);
2299                 if (!__devs)
2300                         goto err;
2301                 memcpy(__devs, devs, sizeof(dev) * count);
2302                 kfree(devs);
2303                 devs = __devs;
2304
2305                 if (is_nd_blk(&nd_region->dev))
2306                         dev = create_namespace_blk(nd_region, nd_label, count);
2307                 else {
2308                         struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2309                         struct nd_namespace_index *nsindex;
2310
2311                         nsindex = to_namespace_index(ndd, ndd->ns_current);
2312                         dev = create_namespace_pmem(nd_region, nsindex, nd_label);
2313                 }
2314
2315                 if (IS_ERR(dev)) {
2316                         switch (PTR_ERR(dev)) {
2317                         case -EAGAIN:
2318                                 /* skip invalid labels */
2319                                 continue;
2320                         case -ENODEV:
2321                                 /* fallthrough to seed creation */
2322                                 break;
2323                         default:
2324                                 goto err;
2325                         }
2326                 } else
2327                         devs[count++] = dev;
2328
2329         }
2330
2331         dev_dbg(&nd_region->dev, "discovered %d %s namespace%s\n",
2332                         count, is_nd_blk(&nd_region->dev)
2333                         ? "blk" : "pmem", count == 1 ? "" : "s");
2334
2335         if (count == 0) {
2336                 /* Publish a zero-sized namespace for userspace to configure. */
2337                 nd_mapping_free_labels(nd_mapping);
2338
2339                 devs = kcalloc(2, sizeof(dev), GFP_KERNEL);
2340                 if (!devs)
2341                         goto err;
2342                 if (is_nd_blk(&nd_region->dev)) {
2343                         struct nd_namespace_blk *nsblk;
2344
2345                         nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
2346                         if (!nsblk)
2347                                 goto err;
2348                         dev = &nsblk->common.dev;
2349                         dev->type = &namespace_blk_device_type;
2350                 } else {
2351                         struct nd_namespace_pmem *nspm;
2352
2353                         nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
2354                         if (!nspm)
2355                                 goto err;
2356                         dev = &nspm->nsio.common.dev;
2357                         dev->type = &namespace_pmem_device_type;
2358                         nd_namespace_pmem_set_resource(nd_region, nspm, 0);
2359                 }
2360                 dev->parent = &nd_region->dev;
2361                 devs[count++] = dev;
2362         } else if (is_memory(&nd_region->dev)) {
2363                 /* clean unselected labels */
2364                 for (i = 0; i < nd_region->ndr_mappings; i++) {
2365                         struct list_head *l, *e;
2366                         LIST_HEAD(list);
2367                         int j;
2368
2369                         nd_mapping = &nd_region->mapping[i];
2370                         if (list_empty(&nd_mapping->labels)) {
2371                                 WARN_ON(1);
2372                                 continue;
2373                         }
2374
2375                         j = count;
2376                         list_for_each_safe(l, e, &nd_mapping->labels) {
2377                                 if (!j--)
2378                                         break;
2379                                 list_move_tail(l, &list);
2380                         }
2381                         nd_mapping_free_labels(nd_mapping);
2382                         list_splice_init(&list, &nd_mapping->labels);
2383                 }
2384         }
2385
2386         if (count > 1)
2387                 sort(devs, count, sizeof(struct device *), cmp_dpa, NULL);
2388
2389         return devs;
2390
2391  err:
2392         if (devs) {
2393                 for (i = 0; devs[i]; i++)
2394                         if (is_nd_blk(&nd_region->dev))
2395                                 namespace_blk_release(devs[i]);
2396                         else
2397                                 namespace_pmem_release(devs[i]);
2398                 kfree(devs);
2399         }
2400         return NULL;
2401 }
2402
2403 static struct device **create_namespaces(struct nd_region *nd_region)
2404 {
2405         struct nd_mapping *nd_mapping;
2406         struct device **devs;
2407         int i;
2408
2409         if (nd_region->ndr_mappings == 0)
2410                 return NULL;
2411
2412         /* lock down all mappings while we scan labels */
2413         for (i = 0; i < nd_region->ndr_mappings; i++) {
2414                 nd_mapping = &nd_region->mapping[i];
2415                 mutex_lock_nested(&nd_mapping->lock, i);
2416         }
2417
2418         devs = scan_labels(nd_region);
2419
2420         for (i = 0; i < nd_region->ndr_mappings; i++) {
2421                 int reverse = nd_region->ndr_mappings - 1 - i;
2422
2423                 nd_mapping = &nd_region->mapping[reverse];
2424                 mutex_unlock(&nd_mapping->lock);
2425         }
2426
2427         return devs;
2428 }
2429
2430 static int init_active_labels(struct nd_region *nd_region)
2431 {
2432         int i;
2433
2434         for (i = 0; i < nd_region->ndr_mappings; i++) {
2435                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
2436                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2437                 struct nvdimm *nvdimm = nd_mapping->nvdimm;
2438                 struct nd_label_ent *label_ent;
2439                 int count, j;
2440
2441                 /*
2442                  * If the dimm is disabled then we may need to prevent
2443                  * the region from being activated.
2444                  */
2445                 if (!ndd) {
2446                         if (test_bit(NDD_LOCKED, &nvdimm->flags))
2447                                 /* fail, label data may be unreadable */;
2448                         else if (test_bit(NDD_ALIASING, &nvdimm->flags))
2449                                 /* fail, labels needed to disambiguate dpa */;
2450                         else
2451                                 return 0;
2452
2453                         dev_err(&nd_region->dev, "%s: is %s, failing probe\n",
2454                                         dev_name(&nd_mapping->nvdimm->dev),
2455                                         test_bit(NDD_LOCKED, &nvdimm->flags)
2456                                         ? "locked" : "disabled");
2457                         return -ENXIO;
2458                 }
2459                 nd_mapping->ndd = ndd;
2460                 atomic_inc(&nvdimm->busy);
2461                 get_ndd(ndd);
2462
2463                 count = nd_label_active_count(ndd);
2464                 dev_dbg(ndd->dev, "count: %d\n", count);
2465                 if (!count)
2466                         continue;
2467                 for (j = 0; j < count; j++) {
2468                         struct nd_namespace_label *label;
2469
2470                         label_ent = kzalloc(sizeof(*label_ent), GFP_KERNEL);
2471                         if (!label_ent)
2472                                 break;
2473                         label = nd_label_active(ndd, j);
2474                         label_ent->label = label;
2475
2476                         mutex_lock(&nd_mapping->lock);
2477                         list_add_tail(&label_ent->list, &nd_mapping->labels);
2478                         mutex_unlock(&nd_mapping->lock);
2479                 }
2480
2481                 if (j >= count)
2482                         continue;
2483
2484                 mutex_lock(&nd_mapping->lock);
2485                 nd_mapping_free_labels(nd_mapping);
2486                 mutex_unlock(&nd_mapping->lock);
2487                 return -ENOMEM;
2488         }
2489
2490         return 0;
2491 }
2492
2493 int nd_region_register_namespaces(struct nd_region *nd_region, int *err)
2494 {
2495         struct device **devs = NULL;
2496         int i, rc = 0, type;
2497
2498         *err = 0;
2499         nvdimm_bus_lock(&nd_region->dev);
2500         rc = init_active_labels(nd_region);
2501         if (rc) {
2502                 nvdimm_bus_unlock(&nd_region->dev);
2503                 return rc;
2504         }
2505
2506         type = nd_region_to_nstype(nd_region);
2507         switch (type) {
2508         case ND_DEVICE_NAMESPACE_IO:
2509                 devs = create_namespace_io(nd_region);
2510                 break;
2511         case ND_DEVICE_NAMESPACE_PMEM:
2512         case ND_DEVICE_NAMESPACE_BLK:
2513                 devs = create_namespaces(nd_region);
2514                 break;
2515         default:
2516                 break;
2517         }
2518         nvdimm_bus_unlock(&nd_region->dev);
2519
2520         if (!devs)
2521                 return -ENODEV;
2522
2523         for (i = 0; devs[i]; i++) {
2524                 struct device *dev = devs[i];
2525                 int id;
2526
2527                 if (type == ND_DEVICE_NAMESPACE_BLK) {
2528                         struct nd_namespace_blk *nsblk;
2529
2530                         nsblk = to_nd_namespace_blk(dev);
2531                         id = ida_simple_get(&nd_region->ns_ida, 0, 0,
2532                                         GFP_KERNEL);
2533                         nsblk->id = id;
2534                 } else if (type == ND_DEVICE_NAMESPACE_PMEM) {
2535                         struct nd_namespace_pmem *nspm;
2536
2537                         nspm = to_nd_namespace_pmem(dev);
2538                         id = ida_simple_get(&nd_region->ns_ida, 0, 0,
2539                                         GFP_KERNEL);
2540                         nspm->id = id;
2541                 } else
2542                         id = i;
2543
2544                 if (id < 0)
2545                         break;
2546                 dev_set_name(dev, "namespace%d.%d", nd_region->id, id);
2547                 dev->groups = nd_namespace_attribute_groups;
2548                 nd_device_register(dev);
2549         }
2550         if (i)
2551                 nd_region->ns_seed = devs[0];
2552
2553         if (devs[i]) {
2554                 int j;
2555
2556                 for (j = i; devs[j]; j++) {
2557                         struct device *dev = devs[j];
2558
2559                         device_initialize(dev);
2560                         put_device(dev);
2561                 }
2562                 *err = j - i;
2563                 /*
2564                  * All of the namespaces we tried to register failed, so
2565                  * fail region activation.
2566                  */
2567                 if (*err == 0)
2568                         rc = -ENODEV;
2569         }
2570         kfree(devs);
2571
2572         if (rc == -ENODEV)
2573                 return rc;
2574
2575         return i;
2576 }