drivers/nvdimm/pmem.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Persistent Memory Driver
   4  *
   5  * Copyright (c) 2014-2015, Intel Corporation.
   6  * Copyright (c) 2015, Christoph Hellwig <hch@lst.de>.
   7  * Copyright (c) 2015, Boaz Harrosh <boaz@plexistor.com>.
   8  */
   9
  10 #include <asm/cacheflush.h>
  11 #include <linux/blkdev.h>
  12 #include <linux/hdreg.h>
  13 #include <linux/init.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/set_memory.h>
  16 #include <linux/module.h>
  17 #include <linux/moduleparam.h>
  18 #include <linux/badblocks.h>
  19 #include <linux/memremap.h>
  20 #include <linux/vmalloc.h>
  21 #include <linux/blk-mq.h>
  22 #include <linux/pfn_t.h>
  23 #include <linux/slab.h>
  24 #include <linux/uio.h>
  25 #include <linux/dax.h>
  26 #include <linux/nd.h>
  27 #include <linux/backing-dev.h>
  28 #include "pmem.h"
  29 #include "pfn.h"
  30 #include "nd.h"
  31
  32 static struct device *to_dev(struct pmem_device *pmem)
  33 {
  34         /*
  35          * nvdimm bus services need a 'dev' parameter, and we record the device
  36          * at init in bb.dev.
  37          */
  38         return pmem->bb.dev;
  39 }
  40
  41 static struct nd_region *to_region(struct pmem_device *pmem)
  42 {
  43         return to_nd_region(to_dev(pmem)->parent);
  44 }
  45
  46 static void hwpoison_clear(struct pmem_device *pmem,
  47                 phys_addr_t phys, unsigned int len)
  48 {
  49         unsigned long pfn_start, pfn_end, pfn;
  50
  51         /* only pmem in the linear map supports HWPoison */
  52         if (is_vmalloc_addr(pmem->virt_addr))
  53                 return;
  54
  55         pfn_start = PHYS_PFN(phys);
  56         pfn_end = pfn_start + PHYS_PFN(len);
  57         for (pfn = pfn_start; pfn < pfn_end; pfn++) {
  58                 struct page *page = pfn_to_page(pfn);
  59
  60                 /*
  61                  * Note, no need to hold a get_dev_pagemap() reference
  62                  * here since we're in the driver I/O path and
  63                  * outstanding I/O requests pin the dev_pagemap.
  64                  */
  65                 if (test_and_clear_pmem_poison(page))
  66                         clear_mce_nospec(pfn);
  67         }
  68 }
  69
  70 static blk_status_t pmem_clear_poison(struct pmem_device *pmem,
  71                 phys_addr_t offset, unsigned int len)
  72 {
  73         struct device *dev = to_dev(pmem);
  74         sector_t sector;
  75         long cleared;
  76         blk_status_t rc = BLK_STS_OK;
  77
  78         sector = (offset - pmem->data_offset) / 512;
  79
  80         cleared = nvdimm_clear_poison(dev, pmem->phys_addr + offset, len);
  81         if (cleared < len)
  82                 rc = BLK_STS_IOERR;
  83         if (cleared > 0 && cleared / 512) {
  84                 hwpoison_clear(pmem, pmem->phys_addr + offset, cleared);
  85                 cleared /= 512;
  86                 dev_dbg(dev, "%#llx clear %ld sector%s\n",
  87                                 (unsigned long long) sector, cleared,
  88                                 cleared > 1 ? "s" : "");
  89                 badblocks_clear(&pmem->bb, sector, cleared);
  90                 if (pmem->bb_state)
  91                         sysfs_notify_dirent(pmem->bb_state);
  92         }
  93
  94         arch_invalidate_pmem(pmem->virt_addr + offset, len);
  95
  96         return rc;
  97 }
  98
  99 static void write_pmem(void *pmem_addr, struct page *page,
 100                 unsigned int off, unsigned int len)
 101 {
 102         unsigned int chunk;
 103         void *mem;
 104
 105         while (len) {
 106                 mem = kmap_atomic(page);
 107                 chunk = min_t(unsigned int, len, PAGE_SIZE - off);
 108                 memcpy_flushcache(pmem_addr, mem + off, chunk);
 109                 kunmap_atomic(mem);
 110                 len -= chunk;
 111                 off = 0;
 112                 page++;
 113                 pmem_addr += chunk;
 114         }
 115 }
 116
 117 static blk_status_t read_pmem(struct page *page, unsigned int off,
 118                 void *pmem_addr, unsigned int len)
 119 {
 120         unsigned int chunk;
 121         unsigned long rem;
 122         void *mem;
 123
 124         while (len) {
 125                 mem = kmap_atomic(page);
 126                 chunk = min_t(unsigned int, len, PAGE_SIZE - off);
 127                 rem = memcpy_mcsafe(mem + off, pmem_addr, chunk);
 128                 kunmap_atomic(mem);
 129                 if (rem)
 130                         return BLK_STS_IOERR;
 131                 len -= chunk;
 132                 off = 0;
 133                 page++;
 134                 pmem_addr += chunk;
 135         }
 136         return BLK_STS_OK;
 137 }
 138
 139 static blk_status_t pmem_do_read(struct pmem_device *pmem,
 140                         struct page *page, unsigned int page_off,
 141                         sector_t sector, unsigned int len)
 142 {
 143         blk_status_t rc;
 144         phys_addr_t pmem_off = sector * 512 + pmem->data_offset;
 145         void *pmem_addr = pmem->virt_addr + pmem_off;
 146
 147         if (unlikely(is_bad_pmem(&pmem->bb, sector, len)))
 148                 return BLK_STS_IOERR;
 149
 150         rc = read_pmem(page, page_off, pmem_addr, len);
 151         flush_dcache_page(page);
 152         return rc;
 153 }
 154
 155 static blk_status_t pmem_do_write(struct pmem_device *pmem,
 156                         struct page *page, unsigned int page_off,
 157                         sector_t sector, unsigned int len)
 158 {
 159         blk_status_t rc = BLK_STS_OK;
 160         bool bad_pmem = false;
 161         phys_addr_t pmem_off = sector * 512 + pmem->data_offset;
 162         void *pmem_addr = pmem->virt_addr + pmem_off;
 163
 164         if (unlikely(is_bad_pmem(&pmem->bb, sector, len)))
 165                 bad_pmem = true;
 166
 167         /*
 168          * Note that we write the data both before and after
 169          * clearing poison.  The write before clear poison
 170          * handles situations where the latest written data is
 171          * preserved and the clear poison operation simply marks
 172          * the address range as valid without changing the data.
 173          * In this case application software can assume that an
 174          * interrupted write will either return the new good
 175          * data or an error.
 176          *
 177          * However, if pmem_clear_poison() leaves the data in an
 178          * indeterminate state we need to perform the write
 179          * after clear poison.
 180          */
 181         flush_dcache_page(page);
 182         write_pmem(pmem_addr, page, page_off, len);
 183         if (unlikely(bad_pmem)) {
 184                 rc = pmem_clear_poison(pmem, pmem_off, len);
 185                 write_pmem(pmem_addr, page, page_off, len);
 186         }
 187
 188         return rc;
 189 }
 190
 191 static blk_qc_t pmem_make_request(struct request_queue *q, struct bio *bio)
 192 {
 193         int ret = 0;
 194         blk_status_t rc = 0;
 195         bool do_acct;
 196         unsigned long start;
 197         struct bio_vec bvec;
 198         struct bvec_iter iter;
 199         struct pmem_device *pmem = q->queuedata;
 200         struct nd_region *nd_region = to_region(pmem);
 201
 202         if (bio->bi_opf & REQ_PREFLUSH)
 203                 ret = nvdimm_flush(nd_region, bio);
 204
 205         do_acct = nd_iostat_start(bio, &start);
 206         bio_for_each_segment(bvec, bio, iter) {
 207                 if (op_is_write(bio_op(bio)))
 208                         rc = pmem_do_write(pmem, bvec.bv_page, bvec.bv_offset,
 209                                 iter.bi_sector, bvec.bv_len);
 210                 else
 211                         rc = pmem_do_read(pmem, bvec.bv_page, bvec.bv_offset,
 212                                 iter.bi_sector, bvec.bv_len);
 213                 if (rc) {
 214                         bio->bi_status = rc;
 215                         break;
 216                 }
 217         }
 218         if (do_acct)
 219                 nd_iostat_end(bio, start);
 220
 221         if (bio->bi_opf & REQ_FUA)
 222                 ret = nvdimm_flush(nd_region, bio);
 223
 224         if (ret)
 225                 bio->bi_status = errno_to_blk_status(ret);
 226
 227         bio_endio(bio);
 228         return BLK_QC_T_NONE;
 229 }
 230
 231 static int pmem_rw_page(struct block_device *bdev, sector_t sector,
 232                        struct page *page, unsigned int op)
 233 {
 234         struct pmem_device *pmem = bdev->bd_queue->queuedata;
 235         blk_status_t rc;
 236
 237         if (op_is_write(op))
 238                 rc = pmem_do_write(pmem, page, 0, sector,
 239                                    hpage_nr_pages(page) * PAGE_SIZE);
 240         else
 241                 rc = pmem_do_read(pmem, page, 0, sector,
 242                                    hpage_nr_pages(page) * PAGE_SIZE);
 243         /*
 244          * The ->rw_page interface is subtle and tricky.  The core
 245          * retries on any error, so we can only invoke page_endio() in
 246          * the successful completion case.  Otherwise, we'll see crashes
 247          * caused by double completion.
 248          */
 249         if (rc == 0)
 250                 page_endio(page, op_is_write(op), 0);
 251
 252         return blk_status_to_errno(rc);
 253 }
 254
 255 /* see "strong" declaration in tools/testing/nvdimm/pmem-dax.c */
 256 __weak long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff,
 257                 long nr_pages, void **kaddr, pfn_t *pfn)
 258 {
 259         resource_size_t offset = PFN_PHYS(pgoff) + pmem->data_offset;
 260
 261         if (unlikely(is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) / 512,
 262                                         PFN_PHYS(nr_pages))))
 263                 return -EIO;
 264
 265         if (kaddr)
 266                 *kaddr = pmem->virt_addr + offset;
 267         if (pfn)
 268                 *pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags);
 269
 270         /*
 271          * If badblocks are present, limit known good range to the
 272          * requested range.
 273          */
 274         if (unlikely(pmem->bb.count))
 275                 return nr_pages;
 276         return PHYS_PFN(pmem->size - pmem->pfn_pad - offset);
 277 }
 278
 279 static const struct block_device_operations pmem_fops = {
 280         .owner =                THIS_MODULE,
 281         .rw_page =              pmem_rw_page,
 282         .revalidate_disk =      nvdimm_revalidate_disk,
 283 };
 284
 285 static int pmem_dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff,
 286                                     size_t nr_pages)
 287 {
 288         struct pmem_device *pmem = dax_get_private(dax_dev);
 289
 290         return blk_status_to_errno(pmem_do_write(pmem, ZERO_PAGE(0), 0,
 291                                    PFN_PHYS(pgoff) >> SECTOR_SHIFT,
 292                                    PAGE_SIZE));
 293 }
 294
 295 static long pmem_dax_direct_access(struct dax_device *dax_dev,
 296                 pgoff_t pgoff, long nr_pages, void **kaddr, pfn_t *pfn)
 297 {
 298         struct pmem_device *pmem = dax_get_private(dax_dev);
 299
 300         return __pmem_direct_access(pmem, pgoff, nr_pages, kaddr, pfn);
 301 }
 302
 303 /*
 304  * Use the 'no check' versions of copy_from_iter_flushcache() and
 305  * copy_to_iter_mcsafe() to bypass HARDENED_USERCOPY overhead. Bounds
 306  * checking, both file offset and device offset, is handled by
 307  * dax_iomap_actor()
 308  */
 309 static size_t pmem_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff,
 310                 void *addr, size_t bytes, struct iov_iter *i)
 311 {
 312         return _copy_from_iter_flushcache(addr, bytes, i);
 313 }
 314
 315 static size_t pmem_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff,
 316                 void *addr, size_t bytes, struct iov_iter *i)
 317 {
 318         return _copy_to_iter_mcsafe(addr, bytes, i);
 319 }
 320
 321 static const struct dax_operations pmem_dax_ops = {
 322         .direct_access = pmem_dax_direct_access,
 323         .dax_supported = generic_fsdax_supported,
 324         .copy_from_iter = pmem_copy_from_iter,
 325         .copy_to_iter = pmem_copy_to_iter,
 326         .zero_page_range = pmem_dax_zero_page_range,
 327 };
 328
 329 static const struct attribute_group *pmem_attribute_groups[] = {
 330         &dax_attribute_group,
 331         NULL,
 332 };
 333
 334 static void pmem_pagemap_cleanup(struct dev_pagemap *pgmap)
 335 {
 336         struct request_queue *q =
 337                 container_of(pgmap->ref, struct request_queue, q_usage_counter);
 338
 339         blk_cleanup_queue(q);
 340 }
 341
 342 static void pmem_release_queue(void *pgmap)
 343 {
 344         pmem_pagemap_cleanup(pgmap);
 345 }
 346
 347 static void pmem_pagemap_kill(struct dev_pagemap *pgmap)
 348 {
 349         struct request_queue *q =
 350                 container_of(pgmap->ref, struct request_queue, q_usage_counter);
 351
 352         blk_freeze_queue_start(q);
 353 }
 354
 355 static void pmem_release_disk(void *__pmem)
 356 {
 357         struct pmem_device *pmem = __pmem;
 358
 359         kill_dax(pmem->dax_dev);
 360         put_dax(pmem->dax_dev);
 361         del_gendisk(pmem->disk);
 362         put_disk(pmem->disk);
 363 }
 364
 365 static const struct dev_pagemap_ops fsdax_pagemap_ops = {
 366         .kill                   = pmem_pagemap_kill,
 367         .cleanup                = pmem_pagemap_cleanup,
 368 };
 369
 370 static int pmem_attach_disk(struct device *dev,
 371                 struct nd_namespace_common *ndns)
 372 {
 373         struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
 374         struct nd_region *nd_region = to_nd_region(dev->parent);
 375         int nid = dev_to_node(dev), fua;
 376         struct resource *res = &nsio->res;
 377         struct resource bb_res;
 378         struct nd_pfn *nd_pfn = NULL;
 379         struct dax_device *dax_dev;
 380         struct nd_pfn_sb *pfn_sb;
 381         struct pmem_device *pmem;
 382         struct request_queue *q;
 383         struct device *gendev;
 384         struct gendisk *disk;
 385         void *addr;
 386         int rc;
 387         unsigned long flags = 0UL;
 388
 389         pmem = devm_kzalloc(dev, sizeof(*pmem), GFP_KERNEL);
 390         if (!pmem)
 391                 return -ENOMEM;
 392
 393         rc = devm_namespace_enable(dev, ndns, nd_info_block_reserve());
 394         if (rc)
 395                 return rc;
 396
 397         /* while nsio_rw_bytes is active, parse a pfn info block if present */
 398         if (is_nd_pfn(dev)) {
 399                 nd_pfn = to_nd_pfn(dev);
 400                 rc = nvdimm_setup_pfn(nd_pfn, &pmem->pgmap);
 401                 if (rc)
 402                         return rc;
 403         }
 404
 405         /* we're attaching a block device, disable raw namespace access */
 406         devm_namespace_disable(dev, ndns);
 407
 408         dev_set_drvdata(dev, pmem);
 409         pmem->phys_addr = res->start;
 410         pmem->size = resource_size(res);
 411         fua = nvdimm_has_flush(nd_region);
 412         if (!IS_ENABLED(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) || fua < 0) {
 413                 dev_warn(dev, "unable to guarantee persistence of writes\n");
 414                 fua = 0;
 415         }
 416
 417         if (!devm_request_mem_region(dev, res->start, resource_size(res),
 418                                 dev_name(&ndns->dev))) {
 419                 dev_warn(dev, "could not reserve region %pR\n", res);
 420                 return -EBUSY;
 421         }
 422
 423         q = blk_alloc_queue(pmem_make_request, dev_to_node(dev));
 424         if (!q)
 425                 return -ENOMEM;
 426
 427         pmem->pfn_flags = PFN_DEV;
 428         pmem->pgmap.ref = &q->q_usage_counter;
 429         if (is_nd_pfn(dev)) {
 430                 pmem->pgmap.type = MEMORY_DEVICE_FS_DAX;
 431                 pmem->pgmap.ops = &fsdax_pagemap_ops;
 432                 addr = devm_memremap_pages(dev, &pmem->pgmap);
 433                 pfn_sb = nd_pfn->pfn_sb;
 434                 pmem->data_offset = le64_to_cpu(pfn_sb->dataoff);
 435                 pmem->pfn_pad = resource_size(res) -
 436                         resource_size(&pmem->pgmap.res);
 437                 pmem->pfn_flags |= PFN_MAP;
 438                 memcpy(&bb_res, &pmem->pgmap.res, sizeof(bb_res));
 439                 bb_res.start += pmem->data_offset;
 440         } else if (pmem_should_map_pages(dev)) {
 441                 memcpy(&pmem->pgmap.res, &nsio->res, sizeof(pmem->pgmap.res));
 442                 pmem->pgmap.type = MEMORY_DEVICE_FS_DAX;
 443                 pmem->pgmap.ops = &fsdax_pagemap_ops;
 444                 addr = devm_memremap_pages(dev, &pmem->pgmap);
 445                 pmem->pfn_flags |= PFN_MAP;
 446                 memcpy(&bb_res, &pmem->pgmap.res, sizeof(bb_res));
 447         } else {
 448                 if (devm_add_action_or_reset(dev, pmem_release_queue,
 449                                         &pmem->pgmap))
 450                         return -ENOMEM;
 451                 addr = devm_memremap(dev, pmem->phys_addr,
 452                                 pmem->size, ARCH_MEMREMAP_PMEM);
 453                 memcpy(&bb_res, &nsio->res, sizeof(bb_res));
 454         }
 455
 456         if (IS_ERR(addr))
 457                 return PTR_ERR(addr);
 458         pmem->virt_addr = addr;
 459
 460         blk_queue_write_cache(q, true, fua);
 461         blk_queue_physical_block_size(q, PAGE_SIZE);
 462         blk_queue_logical_block_size(q, pmem_sector_size(ndns));
 463         blk_queue_max_hw_sectors(q, UINT_MAX);
 464         blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
 465         if (pmem->pfn_flags & PFN_MAP)
 466                 blk_queue_flag_set(QUEUE_FLAG_DAX, q);
 467         q->queuedata = pmem;
 468
 469         disk = alloc_disk_node(0, nid);
 470         if (!disk)
 471                 return -ENOMEM;
 472         pmem->disk = disk;
 473
 474         disk->fops              = &pmem_fops;
 475         disk->queue             = q;
 476         disk->flags             = GENHD_FL_EXT_DEVT;
 477         disk->queue->backing_dev_info->capabilities |= BDI_CAP_SYNCHRONOUS_IO;
 478         nvdimm_namespace_disk_name(ndns, disk->disk_name);
 479         set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset)
 480                         / 512);
 481         if (devm_init_badblocks(dev, &pmem->bb))
 482                 return -ENOMEM;
 483         nvdimm_badblocks_populate(nd_region, &pmem->bb, &bb_res);
 484         disk->bb = &pmem->bb;
 485
 486         if (is_nvdimm_sync(nd_region))
 487                 flags = DAXDEV_F_SYNC;
 488         dax_dev = alloc_dax(pmem, disk->disk_name, &pmem_dax_ops, flags);
 489         if (IS_ERR(dax_dev)) {
 490                 put_disk(disk);
 491                 return PTR_ERR(dax_dev);
 492         }
 493         dax_write_cache(dax_dev, nvdimm_has_cache(nd_region));
 494         pmem->dax_dev = dax_dev;
 495         gendev = disk_to_dev(disk);
 496         gendev->groups = pmem_attribute_groups;
 497
 498         device_add_disk(dev, disk, NULL);
 499         if (devm_add_action_or_reset(dev, pmem_release_disk, pmem))
 500                 return -ENOMEM;
 501
 502         revalidate_disk(disk);
 503
 504         pmem->bb_state = sysfs_get_dirent(disk_to_dev(disk)->kobj.sd,
 505                                           "badblocks");
 506         if (!pmem->bb_state)
 507                 dev_warn(dev, "'badblocks' notification disabled\n");
 508
 509         return 0;
 510 }
 511
 512 static int nd_pmem_probe(struct device *dev)
 513 {
 514         int ret;
 515         struct nd_namespace_common *ndns;
 516
 517         ndns = nvdimm_namespace_common_probe(dev);
 518         if (IS_ERR(ndns))
 519                 return PTR_ERR(ndns);
 520
 521         if (is_nd_btt(dev))
 522                 return nvdimm_namespace_attach_btt(ndns);
 523
 524         if (is_nd_pfn(dev))
 525                 return pmem_attach_disk(dev, ndns);
 526
 527         ret = devm_namespace_enable(dev, ndns, nd_info_block_reserve());
 528         if (ret)
 529                 return ret;
 530
 531         ret = nd_btt_probe(dev, ndns);
 532         if (ret == 0)
 533                 return -ENXIO;
 534
 535         /*
 536          * We have two failure conditions here, there is no
 537          * info reserver block or we found a valid info reserve block
 538          * but failed to initialize the pfn superblock.
 539          *
 540          * For the first case consider namespace as a raw pmem namespace
 541          * and attach a disk.
 542          *
 543          * For the latter, consider this a success and advance the namespace
 544          * seed.
 545          */
 546         ret = nd_pfn_probe(dev, ndns);
 547         if (ret == 0)
 548                 return -ENXIO;
 549         else if (ret == -EOPNOTSUPP)
 550                 return ret;
 551
 552         ret = nd_dax_probe(dev, ndns);
 553         if (ret == 0)
 554                 return -ENXIO;
 555         else if (ret == -EOPNOTSUPP)
 556                 return ret;
 557
 558         /* probe complete, attach handles namespace enabling */
 559         devm_namespace_disable(dev, ndns);
 560
 561         return pmem_attach_disk(dev, ndns);
 562 }
 563
 564 static int nd_pmem_remove(struct device *dev)
 565 {
 566         struct pmem_device *pmem = dev_get_drvdata(dev);
 567
 568         if (is_nd_btt(dev))
 569                 nvdimm_namespace_detach_btt(to_nd_btt(dev));
 570         else {
 571                 /*
 572                  * Note, this assumes nd_device_lock() context to not
 573                  * race nd_pmem_notify()
 574                  */
 575                 sysfs_put(pmem->bb_state);
 576                 pmem->bb_state = NULL;
 577         }
 578         nvdimm_flush(to_nd_region(dev->parent), NULL);
 579
 580         return 0;
 581 }
 582
 583 static void nd_pmem_shutdown(struct device *dev)
 584 {
 585         nvdimm_flush(to_nd_region(dev->parent), NULL);
 586 }
 587
 588 static void nd_pmem_notify(struct device *dev, enum nvdimm_event event)
 589 {
 590         struct nd_region *nd_region;
 591         resource_size_t offset = 0, end_trunc = 0;
 592         struct nd_namespace_common *ndns;
 593         struct nd_namespace_io *nsio;
 594         struct resource res;
 595         struct badblocks *bb;
 596         struct kernfs_node *bb_state;
 597
 598         if (event != NVDIMM_REVALIDATE_POISON)
 599                 return;
 600
 601         if (is_nd_btt(dev)) {
 602                 struct nd_btt *nd_btt = to_nd_btt(dev);
 603
 604                 ndns = nd_btt->ndns;
 605                 nd_region = to_nd_region(ndns->dev.parent);
 606                 nsio = to_nd_namespace_io(&ndns->dev);
 607                 bb = &nsio->bb;
 608                 bb_state = NULL;
 609         } else {
 610                 struct pmem_device *pmem = dev_get_drvdata(dev);
 611
 612                 nd_region = to_region(pmem);
 613                 bb = &pmem->bb;
 614                 bb_state = pmem->bb_state;
 615
 616                 if (is_nd_pfn(dev)) {
 617                         struct nd_pfn *nd_pfn = to_nd_pfn(dev);
 618                         struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
 619
 620                         ndns = nd_pfn->ndns;
 621                         offset = pmem->data_offset +
 622                                         __le32_to_cpu(pfn_sb->start_pad);
 623                         end_trunc = __le32_to_cpu(pfn_sb->end_trunc);
 624                 } else {
 625                         ndns = to_ndns(dev);
 626                 }
 627
 628                 nsio = to_nd_namespace_io(&ndns->dev);
 629         }
 630
 631         res.start = nsio->res.start + offset;
 632         res.end = nsio->res.end - end_trunc;
 633         nvdimm_badblocks_populate(nd_region, bb, &res);
 634         if (bb_state)
 635                 sysfs_notify_dirent(bb_state);
 636 }
 637
 638 MODULE_ALIAS("pmem");
 639 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_IO);
 640 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_PMEM);
 641 static struct nd_device_driver nd_pmem_driver = {
 642         .probe = nd_pmem_probe,
 643         .remove = nd_pmem_remove,
 644         .notify = nd_pmem_notify,
 645         .shutdown = nd_pmem_shutdown,
 646         .drv = {
 647                 .name = "nd_pmem",
 648         },
 649         .type = ND_DRIVER_NAMESPACE_IO | ND_DRIVER_NAMESPACE_PMEM,
 650 };
 651
 652 module_nd_driver(nd_pmem_driver);
 653
 654 MODULE_AUTHOR("Ross Zwisler <ross.zwisler@linux.intel.com>");
 655 MODULE_LICENSE("GPL v2");