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