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