drivers/nvdimm/region_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/scatterlist.h>
  14 #include <linux/highmem.h>
  15 #include <linux/sched.h>
  16 #include <linux/slab.h>
  17 #include <linux/sort.h>
  18 #include <linux/io.h>
  19 #include <linux/nd.h>
  20 #include "nd-core.h"
  21 #include "nd.h"
  22
  23 static DEFINE_IDA(region_ida);
  24
  25 static void nd_region_release(struct device *dev)
  26 {
  27         struct nd_region *nd_region = to_nd_region(dev);
  28         u16 i;
  29
  30         for (i = 0; i < nd_region->ndr_mappings; i++) {
  31                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
  32                 struct nvdimm *nvdimm = nd_mapping->nvdimm;
  33
  34                 put_device(&nvdimm->dev);
  35         }
  36         free_percpu(nd_region->lane);
  37         ida_simple_remove(&region_ida, nd_region->id);
  38         if (is_nd_blk(dev))
  39                 kfree(to_nd_blk_region(dev));
  40         else
  41                 kfree(nd_region);
  42 }
  43
  44 static struct device_type nd_blk_device_type = {
  45         .name = "nd_blk",
  46         .release = nd_region_release,
  47 };
  48
  49 static struct device_type nd_pmem_device_type = {
  50         .name = "nd_pmem",
  51         .release = nd_region_release,
  52 };
  53
  54 static struct device_type nd_volatile_device_type = {
  55         .name = "nd_volatile",
  56         .release = nd_region_release,
  57 };
  58
  59 bool is_nd_pmem(struct device *dev)
  60 {
  61         return dev ? dev->type == &nd_pmem_device_type : false;
  62 }
  63
  64 bool is_nd_blk(struct device *dev)
  65 {
  66         return dev ? dev->type == &nd_blk_device_type : false;
  67 }
  68
  69 struct nd_region *to_nd_region(struct device *dev)
  70 {
  71         struct nd_region *nd_region = container_of(dev, struct nd_region, dev);
  72
  73         WARN_ON(dev->type->release != nd_region_release);
  74         return nd_region;
  75 }
  76 EXPORT_SYMBOL_GPL(to_nd_region);
  77
  78 struct nd_blk_region *to_nd_blk_region(struct device *dev)
  79 {
  80         struct nd_region *nd_region = to_nd_region(dev);
  81
  82         WARN_ON(!is_nd_blk(dev));
  83         return container_of(nd_region, struct nd_blk_region, nd_region);
  84 }
  85 EXPORT_SYMBOL_GPL(to_nd_blk_region);
  86
  87 void *nd_region_provider_data(struct nd_region *nd_region)
  88 {
  89         return nd_region->provider_data;
  90 }
  91 EXPORT_SYMBOL_GPL(nd_region_provider_data);
  92
  93 void *nd_blk_region_provider_data(struct nd_blk_region *ndbr)
  94 {
  95         return ndbr->blk_provider_data;
  96 }
  97 EXPORT_SYMBOL_GPL(nd_blk_region_provider_data);
  98
  99 void nd_blk_region_set_provider_data(struct nd_blk_region *ndbr, void *data)
 100 {
 101         ndbr->blk_provider_data = data;
 102 }
 103 EXPORT_SYMBOL_GPL(nd_blk_region_set_provider_data);
 104
 105 /**
 106  * nd_region_to_nstype() - region to an integer namespace type
 107  * @nd_region: region-device to interrogate
 108  *
 109  * This is the 'nstype' attribute of a region as well, an input to the
 110  * MODALIAS for namespace devices, and bit number for a nvdimm_bus to match
 111  * namespace devices with namespace drivers.
 112  */
 113 int nd_region_to_nstype(struct nd_region *nd_region)
 114 {
 115         if (is_nd_pmem(&nd_region->dev)) {
 116                 u16 i, alias;
 117
 118                 for (i = 0, alias = 0; i < nd_region->ndr_mappings; i++) {
 119                         struct nd_mapping *nd_mapping = &nd_region->mapping[i];
 120                         struct nvdimm *nvdimm = nd_mapping->nvdimm;
 121
 122                         if (nvdimm->flags & NDD_ALIASING)
 123                                 alias++;
 124                 }
 125                 if (alias)
 126                         return ND_DEVICE_NAMESPACE_PMEM;
 127                 else
 128                         return ND_DEVICE_NAMESPACE_IO;
 129         } else if (is_nd_blk(&nd_region->dev)) {
 130                 return ND_DEVICE_NAMESPACE_BLK;
 131         }
 132
 133         return 0;
 134 }
 135 EXPORT_SYMBOL(nd_region_to_nstype);
 136
 137 static int is_uuid_busy(struct device *dev, void *data)
 138 {
 139         struct nd_region *nd_region = to_nd_region(dev->parent);
 140         u8 *uuid = data;
 141
 142         switch (nd_region_to_nstype(nd_region)) {
 143         case ND_DEVICE_NAMESPACE_PMEM: {
 144                 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
 145
 146                 if (!nspm->uuid)
 147                         break;
 148                 if (memcmp(uuid, nspm->uuid, NSLABEL_UUID_LEN) == 0)
 149                         return -EBUSY;
 150                 break;
 151         }
 152         case ND_DEVICE_NAMESPACE_BLK: {
 153                 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 154
 155                 if (!nsblk->uuid)
 156                         break;
 157                 if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) == 0)
 158                         return -EBUSY;
 159                 break;
 160         }
 161         default:
 162                 break;
 163         }
 164
 165         return 0;
 166 }
 167
 168 static int is_namespace_uuid_busy(struct device *dev, void *data)
 169 {
 170         if (is_nd_pmem(dev) || is_nd_blk(dev))
 171                 return device_for_each_child(dev, data, is_uuid_busy);
 172         return 0;
 173 }
 174
 175 /**
 176  * nd_is_uuid_unique - verify that no other namespace has @uuid
 177  * @dev: any device on a nvdimm_bus
 178  * @uuid: uuid to check
 179  */
 180 bool nd_is_uuid_unique(struct device *dev, u8 *uuid)
 181 {
 182         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
 183
 184         if (!nvdimm_bus)
 185                 return false;
 186         WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm_bus->dev));
 187         if (device_for_each_child(&nvdimm_bus->dev, uuid,
 188                                 is_namespace_uuid_busy) != 0)
 189                 return false;
 190         return true;
 191 }
 192
 193 static ssize_t size_show(struct device *dev,
 194                 struct device_attribute *attr, char *buf)
 195 {
 196         struct nd_region *nd_region = to_nd_region(dev);
 197         unsigned long long size = 0;
 198
 199         if (is_nd_pmem(dev)) {
 200                 size = nd_region->ndr_size;
 201         } else if (nd_region->ndr_mappings == 1) {
 202                 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
 203
 204                 size = nd_mapping->size;
 205         }
 206
 207         return sprintf(buf, "%llu\n", size);
 208 }
 209 static DEVICE_ATTR_RO(size);
 210
 211 static ssize_t mappings_show(struct device *dev,
 212                 struct device_attribute *attr, char *buf)
 213 {
 214         struct nd_region *nd_region = to_nd_region(dev);
 215
 216         return sprintf(buf, "%d\n", nd_region->ndr_mappings);
 217 }
 218 static DEVICE_ATTR_RO(mappings);
 219
 220 static ssize_t nstype_show(struct device *dev,
 221                 struct device_attribute *attr, char *buf)
 222 {
 223         struct nd_region *nd_region = to_nd_region(dev);
 224
 225         return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region));
 226 }
 227 static DEVICE_ATTR_RO(nstype);
 228
 229 static ssize_t set_cookie_show(struct device *dev,
 230                 struct device_attribute *attr, char *buf)
 231 {
 232         struct nd_region *nd_region = to_nd_region(dev);
 233         struct nd_interleave_set *nd_set = nd_region->nd_set;
 234
 235         if (is_nd_pmem(dev) && nd_set)
 236                 /* pass, should be precluded by region_visible */;
 237         else
 238                 return -ENXIO;
 239
 240         return sprintf(buf, "%#llx\n", nd_set->cookie);
 241 }
 242 static DEVICE_ATTR_RO(set_cookie);
 243
 244 resource_size_t nd_region_available_dpa(struct nd_region *nd_region)
 245 {
 246         resource_size_t blk_max_overlap = 0, available, overlap;
 247         int i;
 248
 249         WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
 250
 251  retry:
 252         available = 0;
 253         overlap = blk_max_overlap;
 254         for (i = 0; i < nd_region->ndr_mappings; i++) {
 255                 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
 256                 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 257
 258                 /* if a dimm is disabled the available capacity is zero */
 259                 if (!ndd)
 260                         return 0;
 261
 262                 if (is_nd_pmem(&nd_region->dev)) {
 263                         available += nd_pmem_available_dpa(nd_region,
 264                                         nd_mapping, &overlap);
 265                         if (overlap > blk_max_overlap) {
 266                                 blk_max_overlap = overlap;
 267                                 goto retry;
 268                         }
 269                 } else if (is_nd_blk(&nd_region->dev)) {
 270                         available += nd_blk_available_dpa(nd_mapping);
 271                 }
 272         }
 273
 274         return available;
 275 }
 276
 277 static ssize_t available_size_show(struct device *dev,
 278                 struct device_attribute *attr, char *buf)
 279 {
 280         struct nd_region *nd_region = to_nd_region(dev);
 281         unsigned long long available = 0;
 282
 283         /*
 284          * Flush in-flight updates and grab a snapshot of the available
 285          * size.  Of course, this value is potentially invalidated the
 286          * memory nvdimm_bus_lock() is dropped, but that's userspace's
 287          * problem to not race itself.
 288          */
 289         nvdimm_bus_lock(dev);
 290         wait_nvdimm_bus_probe_idle(dev);
 291         available = nd_region_available_dpa(nd_region);
 292         nvdimm_bus_unlock(dev);
 293
 294         return sprintf(buf, "%llu\n", available);
 295 }
 296 static DEVICE_ATTR_RO(available_size);
 297
 298 static ssize_t init_namespaces_show(struct device *dev,
 299                 struct device_attribute *attr, char *buf)
 300 {
 301         struct nd_region_namespaces *num_ns = dev_get_drvdata(dev);
 302         ssize_t rc;
 303
 304         nvdimm_bus_lock(dev);
 305         if (num_ns)
 306                 rc = sprintf(buf, "%d/%d\n", num_ns->active, num_ns->count);
 307         else
 308                 rc = -ENXIO;
 309         nvdimm_bus_unlock(dev);
 310
 311         return rc;
 312 }
 313 static DEVICE_ATTR_RO(init_namespaces);
 314
 315 static ssize_t namespace_seed_show(struct device *dev,
 316                 struct device_attribute *attr, char *buf)
 317 {
 318         struct nd_region *nd_region = to_nd_region(dev);
 319         ssize_t rc;
 320
 321         nvdimm_bus_lock(dev);
 322         if (nd_region->ns_seed)
 323                 rc = sprintf(buf, "%s\n", dev_name(nd_region->ns_seed));
 324         else
 325                 rc = sprintf(buf, "\n");
 326         nvdimm_bus_unlock(dev);
 327         return rc;
 328 }
 329 static DEVICE_ATTR_RO(namespace_seed);
 330
 331 static ssize_t btt_seed_show(struct device *dev,
 332                 struct device_attribute *attr, char *buf)
 333 {
 334         struct nd_region *nd_region = to_nd_region(dev);
 335         ssize_t rc;
 336
 337         nvdimm_bus_lock(dev);
 338         if (nd_region->btt_seed)
 339                 rc = sprintf(buf, "%s\n", dev_name(nd_region->btt_seed));
 340         else
 341                 rc = sprintf(buf, "\n");
 342         nvdimm_bus_unlock(dev);
 343
 344         return rc;
 345 }
 346 static DEVICE_ATTR_RO(btt_seed);
 347
 348 static struct attribute *nd_region_attributes[] = {
 349         &dev_attr_size.attr,
 350         &dev_attr_nstype.attr,
 351         &dev_attr_mappings.attr,
 352         &dev_attr_btt_seed.attr,
 353         &dev_attr_set_cookie.attr,
 354         &dev_attr_available_size.attr,
 355         &dev_attr_namespace_seed.attr,
 356         &dev_attr_init_namespaces.attr,
 357         NULL,
 358 };
 359
 360 static umode_t region_visible(struct kobject *kobj, struct attribute *a, int n)
 361 {
 362         struct device *dev = container_of(kobj, typeof(*dev), kobj);
 363         struct nd_region *nd_region = to_nd_region(dev);
 364         struct nd_interleave_set *nd_set = nd_region->nd_set;
 365         int type = nd_region_to_nstype(nd_region);
 366
 367         if (a != &dev_attr_set_cookie.attr
 368                         && a != &dev_attr_available_size.attr)
 369                 return a->mode;
 370
 371         if ((type == ND_DEVICE_NAMESPACE_PMEM
 372                                 || type == ND_DEVICE_NAMESPACE_BLK)
 373                         && a == &dev_attr_available_size.attr)
 374                 return a->mode;
 375         else if (is_nd_pmem(dev) && nd_set)
 376                 return a->mode;
 377
 378         return 0;
 379 }
 380
 381 struct attribute_group nd_region_attribute_group = {
 382         .attrs = nd_region_attributes,
 383         .is_visible = region_visible,
 384 };
 385 EXPORT_SYMBOL_GPL(nd_region_attribute_group);
 386
 387 u64 nd_region_interleave_set_cookie(struct nd_region *nd_region)
 388 {
 389         struct nd_interleave_set *nd_set = nd_region->nd_set;
 390
 391         if (nd_set)
 392                 return nd_set->cookie;
 393         return 0;
 394 }
 395
 396 /*
 397  * Upon successful probe/remove, take/release a reference on the
 398  * associated interleave set (if present), and plant new btt + namespace
 399  * seeds.  Also, on the removal of a BLK region, notify the provider to
 400  * disable the region.
 401  */
 402 static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus,
 403                 struct device *dev, bool probe)
 404 {
 405         struct nd_region *nd_region;
 406
 407         if (!probe && (is_nd_pmem(dev) || is_nd_blk(dev))) {
 408                 int i;
 409
 410                 nd_region = to_nd_region(dev);
 411                 for (i = 0; i < nd_region->ndr_mappings; i++) {
 412                         struct nd_mapping *nd_mapping = &nd_region->mapping[i];
 413                         struct nvdimm_drvdata *ndd = nd_mapping->ndd;
 414                         struct nvdimm *nvdimm = nd_mapping->nvdimm;
 415
 416                         kfree(nd_mapping->labels);
 417                         nd_mapping->labels = NULL;
 418                         put_ndd(ndd);
 419                         nd_mapping->ndd = NULL;
 420                         if (ndd)
 421                                 atomic_dec(&nvdimm->busy);
 422                 }
 423
 424                 if (is_nd_pmem(dev))
 425                         return;
 426
 427                 to_nd_blk_region(dev)->disable(nvdimm_bus, dev);
 428         }
 429         if (dev->parent && is_nd_blk(dev->parent) && probe) {
 430                 nd_region = to_nd_region(dev->parent);
 431                 nvdimm_bus_lock(dev);
 432                 if (nd_region->ns_seed == dev)
 433                         nd_region_create_blk_seed(nd_region);
 434                 nvdimm_bus_unlock(dev);
 435         }
 436         if (is_nd_btt(dev) && probe) {
 437                 nd_region = to_nd_region(dev->parent);
 438                 nvdimm_bus_lock(dev);
 439                 if (nd_region->btt_seed == dev)
 440                         nd_region_create_btt_seed(nd_region);
 441                 nvdimm_bus_unlock(dev);
 442         }
 443 }
 444
 445 void nd_region_probe_success(struct nvdimm_bus *nvdimm_bus, struct device *dev)
 446 {
 447         nd_region_notify_driver_action(nvdimm_bus, dev, true);
 448 }
 449
 450 void nd_region_disable(struct nvdimm_bus *nvdimm_bus, struct device *dev)
 451 {
 452         nd_region_notify_driver_action(nvdimm_bus, dev, false);
 453 }
 454
 455 static ssize_t mappingN(struct device *dev, char *buf, int n)
 456 {
 457         struct nd_region *nd_region = to_nd_region(dev);
 458         struct nd_mapping *nd_mapping;
 459         struct nvdimm *nvdimm;
 460
 461         if (n >= nd_region->ndr_mappings)
 462                 return -ENXIO;
 463         nd_mapping = &nd_region->mapping[n];
 464         nvdimm = nd_mapping->nvdimm;
 465
 466         return sprintf(buf, "%s,%llu,%llu\n", dev_name(&nvdimm->dev),
 467                         nd_mapping->start, nd_mapping->size);
 468 }
 469
 470 #define REGION_MAPPING(idx) \
 471 static ssize_t mapping##idx##_show(struct device *dev,          \
 472                 struct device_attribute *attr, char *buf)       \
 473 {                                                               \
 474         return mappingN(dev, buf, idx);                         \
 475 }                                                               \
 476 static DEVICE_ATTR_RO(mapping##idx)
 477
 478 /*
 479  * 32 should be enough for a while, even in the presence of socket
 480  * interleave a 32-way interleave set is a degenerate case.
 481  */
 482 REGION_MAPPING(0);
 483 REGION_MAPPING(1);
 484 REGION_MAPPING(2);
 485 REGION_MAPPING(3);
 486 REGION_MAPPING(4);
 487 REGION_MAPPING(5);
 488 REGION_MAPPING(6);
 489 REGION_MAPPING(7);
 490 REGION_MAPPING(8);
 491 REGION_MAPPING(9);
 492 REGION_MAPPING(10);
 493 REGION_MAPPING(11);
 494 REGION_MAPPING(12);
 495 REGION_MAPPING(13);
 496 REGION_MAPPING(14);
 497 REGION_MAPPING(15);
 498 REGION_MAPPING(16);
 499 REGION_MAPPING(17);
 500 REGION_MAPPING(18);
 501 REGION_MAPPING(19);
 502 REGION_MAPPING(20);
 503 REGION_MAPPING(21);
 504 REGION_MAPPING(22);
 505 REGION_MAPPING(23);
 506 REGION_MAPPING(24);
 507 REGION_MAPPING(25);
 508 REGION_MAPPING(26);
 509 REGION_MAPPING(27);
 510 REGION_MAPPING(28);
 511 REGION_MAPPING(29);
 512 REGION_MAPPING(30);
 513 REGION_MAPPING(31);
 514
 515 static umode_t mapping_visible(struct kobject *kobj, struct attribute *a, int n)
 516 {
 517         struct device *dev = container_of(kobj, struct device, kobj);
 518         struct nd_region *nd_region = to_nd_region(dev);
 519
 520         if (n < nd_region->ndr_mappings)
 521                 return a->mode;
 522         return 0;
 523 }
 524
 525 static struct attribute *mapping_attributes[] = {
 526         &dev_attr_mapping0.attr,
 527         &dev_attr_mapping1.attr,
 528         &dev_attr_mapping2.attr,
 529         &dev_attr_mapping3.attr,
 530         &dev_attr_mapping4.attr,
 531         &dev_attr_mapping5.attr,
 532         &dev_attr_mapping6.attr,
 533         &dev_attr_mapping7.attr,
 534         &dev_attr_mapping8.attr,
 535         &dev_attr_mapping9.attr,
 536         &dev_attr_mapping10.attr,
 537         &dev_attr_mapping11.attr,
 538         &dev_attr_mapping12.attr,
 539         &dev_attr_mapping13.attr,
 540         &dev_attr_mapping14.attr,
 541         &dev_attr_mapping15.attr,
 542         &dev_attr_mapping16.attr,
 543         &dev_attr_mapping17.attr,
 544         &dev_attr_mapping18.attr,
 545         &dev_attr_mapping19.attr,
 546         &dev_attr_mapping20.attr,
 547         &dev_attr_mapping21.attr,
 548         &dev_attr_mapping22.attr,
 549         &dev_attr_mapping23.attr,
 550         &dev_attr_mapping24.attr,
 551         &dev_attr_mapping25.attr,
 552         &dev_attr_mapping26.attr,
 553         &dev_attr_mapping27.attr,
 554         &dev_attr_mapping28.attr,
 555         &dev_attr_mapping29.attr,
 556         &dev_attr_mapping30.attr,
 557         &dev_attr_mapping31.attr,
 558         NULL,
 559 };
 560
 561 struct attribute_group nd_mapping_attribute_group = {
 562         .is_visible = mapping_visible,
 563         .attrs = mapping_attributes,
 564 };
 565 EXPORT_SYMBOL_GPL(nd_mapping_attribute_group);
 566
 567 int nd_blk_region_init(struct nd_region *nd_region)
 568 {
 569         struct device *dev = &nd_region->dev;
 570         struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
 571
 572         if (!is_nd_blk(dev))
 573                 return 0;
 574
 575         if (nd_region->ndr_mappings < 1) {
 576                 dev_err(dev, "invalid BLK region\n");
 577                 return -ENXIO;
 578         }
 579
 580         return to_nd_blk_region(dev)->enable(nvdimm_bus, dev);
 581 }
 582
 583 /**
 584  * nd_region_acquire_lane - allocate and lock a lane
 585  * @nd_region: region id and number of lanes possible
 586  *
 587  * A lane correlates to a BLK-data-window and/or a log slot in the BTT.
 588  * We optimize for the common case where there are 256 lanes, one
 589  * per-cpu.  For larger systems we need to lock to share lanes.  For now
 590  * this implementation assumes the cost of maintaining an allocator for
 591  * free lanes is on the order of the lock hold time, so it implements a
 592  * static lane = cpu % num_lanes mapping.
 593  *
 594  * In the case of a BTT instance on top of a BLK namespace a lane may be
 595  * acquired recursively.  We lock on the first instance.
 596  *
 597  * In the case of a BTT instance on top of PMEM, we only acquire a lane
 598  * for the BTT metadata updates.
 599  */
 600 unsigned int nd_region_acquire_lane(struct nd_region *nd_region)
 601 {
 602         unsigned int cpu, lane;
 603
 604         cpu = get_cpu();
 605         if (nd_region->num_lanes < nr_cpu_ids) {
 606                 struct nd_percpu_lane *ndl_lock, *ndl_count;
 607
 608                 lane = cpu % nd_region->num_lanes;
 609                 ndl_count = per_cpu_ptr(nd_region->lane, cpu);
 610                 ndl_lock = per_cpu_ptr(nd_region->lane, lane);
 611                 if (ndl_count->count++ == 0)
 612                         spin_lock(&ndl_lock->lock);
 613         } else
 614                 lane = cpu;
 615
 616         return lane;
 617 }
 618 EXPORT_SYMBOL(nd_region_acquire_lane);
 619
 620 void nd_region_release_lane(struct nd_region *nd_region, unsigned int lane)
 621 {
 622         if (nd_region->num_lanes < nr_cpu_ids) {
 623                 unsigned int cpu = get_cpu();
 624                 struct nd_percpu_lane *ndl_lock, *ndl_count;
 625
 626                 ndl_count = per_cpu_ptr(nd_region->lane, cpu);
 627                 ndl_lock = per_cpu_ptr(nd_region->lane, lane);
 628                 if (--ndl_count->count == 0)
 629                         spin_unlock(&ndl_lock->lock);
 630                 put_cpu();
 631         }
 632         put_cpu();
 633 }
 634 EXPORT_SYMBOL(nd_region_release_lane);
 635
 636 static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus,
 637                 struct nd_region_desc *ndr_desc, struct device_type *dev_type,
 638                 const char *caller)
 639 {
 640         struct nd_region *nd_region;
 641         struct device *dev;
 642         void *region_buf;
 643         unsigned int i;
 644
 645         for (i = 0; i < ndr_desc->num_mappings; i++) {
 646                 struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i];
 647                 struct nvdimm *nvdimm = nd_mapping->nvdimm;
 648
 649                 if ((nd_mapping->start | nd_mapping->size) % SZ_4K) {
 650                         dev_err(&nvdimm_bus->dev, "%s: %s mapping%d is not 4K aligned\n",
 651                                         caller, dev_name(&nvdimm->dev), i);
 652
 653                         return NULL;
 654                 }
 655         }
 656
 657         if (dev_type == &nd_blk_device_type) {
 658                 struct nd_blk_region_desc *ndbr_desc;
 659                 struct nd_blk_region *ndbr;
 660
 661                 ndbr_desc = to_blk_region_desc(ndr_desc);
 662                 ndbr = kzalloc(sizeof(*ndbr) + sizeof(struct nd_mapping)
 663                                 * ndr_desc->num_mappings,
 664                                 GFP_KERNEL);
 665                 if (ndbr) {
 666                         nd_region = &ndbr->nd_region;
 667                         ndbr->enable = ndbr_desc->enable;
 668                         ndbr->disable = ndbr_desc->disable;
 669                         ndbr->do_io = ndbr_desc->do_io;
 670                 }
 671                 region_buf = ndbr;
 672         } else {
 673                 nd_region = kzalloc(sizeof(struct nd_region)
 674                                 + sizeof(struct nd_mapping)
 675                                 * ndr_desc->num_mappings,
 676                                 GFP_KERNEL);
 677                 region_buf = nd_region;
 678         }
 679
 680         if (!region_buf)
 681                 return NULL;
 682         nd_region->id = ida_simple_get(&region_ida, 0, 0, GFP_KERNEL);
 683         if (nd_region->id < 0)
 684                 goto err_id;
 685
 686         nd_region->lane = alloc_percpu(struct nd_percpu_lane);
 687         if (!nd_region->lane)
 688                 goto err_percpu;
 689
 690         for (i = 0; i < nr_cpu_ids; i++) {
 691                 struct nd_percpu_lane *ndl;
 692
 693                 ndl = per_cpu_ptr(nd_region->lane, i);
 694                 spin_lock_init(&ndl->lock);
 695                 ndl->count = 0;
 696         }
 697
 698         memcpy(nd_region->mapping, ndr_desc->nd_mapping,
 699                         sizeof(struct nd_mapping) * ndr_desc->num_mappings);
 700         for (i = 0; i < ndr_desc->num_mappings; i++) {
 701                 struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i];
 702                 struct nvdimm *nvdimm = nd_mapping->nvdimm;
 703
 704                 get_device(&nvdimm->dev);
 705         }
 706         nd_region->ndr_mappings = ndr_desc->num_mappings;
 707         nd_region->provider_data = ndr_desc->provider_data;
 708         nd_region->nd_set = ndr_desc->nd_set;
 709         nd_region->num_lanes = ndr_desc->num_lanes;
 710         ida_init(&nd_region->ns_ida);
 711         ida_init(&nd_region->btt_ida);
 712         dev = &nd_region->dev;
 713         dev_set_name(dev, "region%d", nd_region->id);
 714         dev->parent = &nvdimm_bus->dev;
 715         dev->type = dev_type;
 716         dev->groups = ndr_desc->attr_groups;
 717         nd_region->ndr_size = resource_size(ndr_desc->res);
 718         nd_region->ndr_start = ndr_desc->res->start;
 719         nd_device_register(dev);
 720
 721         return nd_region;
 722
 723  err_percpu:
 724         ida_simple_remove(&region_ida, nd_region->id);
 725  err_id:
 726         kfree(region_buf);
 727         return NULL;
 728 }
 729
 730 struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
 731                 struct nd_region_desc *ndr_desc)
 732 {
 733         ndr_desc->num_lanes = ND_MAX_LANES;
 734         return nd_region_create(nvdimm_bus, ndr_desc, &nd_pmem_device_type,
 735                         __func__);
 736 }
 737 EXPORT_SYMBOL_GPL(nvdimm_pmem_region_create);
 738
 739 struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
 740                 struct nd_region_desc *ndr_desc)
 741 {
 742         if (ndr_desc->num_mappings > 1)
 743                 return NULL;
 744         ndr_desc->num_lanes = min(ndr_desc->num_lanes, ND_MAX_LANES);
 745         return nd_region_create(nvdimm_bus, ndr_desc, &nd_blk_device_type,
 746                         __func__);
 747 }
 748 EXPORT_SYMBOL_GPL(nvdimm_blk_region_create);
 749
 750 struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
 751                 struct nd_region_desc *ndr_desc)
 752 {
 753         ndr_desc->num_lanes = ND_MAX_LANES;
 754         return nd_region_create(nvdimm_bus, ndr_desc, &nd_volatile_device_type,
 755                         __func__);
 756 }
 757 EXPORT_SYMBOL_GPL(nvdimm_volatile_region_create);