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 <linux/blkdev.h>
  11 #include <linux/hdreg.h>
  12 #include <linux/init.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/set_memory.h>
  15 #include <linux/module.h>
  16 #include <linux/moduleparam.h>
  17 #include <linux/badblocks.h>
  18 #include <linux/memremap.h>
  19 #include <linux/vmalloc.h>
  20 #include <linux/blk-mq.h>
  21 #include <linux/pfn_t.h>
  22 #include <linux/slab.h>
  23 #include <linux/uio.h>
  24 #include <linux/dax.h>
  25 #include <linux/nd.h>
  26 #include <linux/backing-dev.h>
  27 #include <linux/mm.h>
  28 #include <asm/cacheflush.h>
  29 #include "pmem.h"
  30 #include "pfn.h"
  31 #include "nd.h"
  32
  33 static struct device *to_dev(struct pmem_device *pmem)
  34 {
  35         /*
  36          * nvdimm bus services need a 'dev' parameter, and we record the device
  37          * at init in bb.dev.
  38          */
  39         return pmem->bb.dev;
  40 }
  41
  42 static struct nd_region *to_region(struct pmem_device *pmem)
  43 {
  44         return to_nd_region(to_dev(pmem)->parent);
  45 }
  46
  47 static void hwpoison_clear(struct pmem_device *pmem,
  48                 phys_addr_t phys, unsigned int len)
  49 {
  50         unsigned long pfn_start, pfn_end, pfn;
  51
  52         /* only pmem in the linear map supports HWPoison */
  53         if (is_vmalloc_addr(pmem->virt_addr))
  54                 return;
  55
  56         pfn_start = PHYS_PFN(phys);
  57         pfn_end = pfn_start + PHYS_PFN(len);
  58         for (pfn = pfn_start; pfn < pfn_end; pfn++) {
  59                 struct page *page = pfn_to_page(pfn);
  60
  61                 /*
  62                  * Note, no need to hold a get_dev_pagemap() reference
  63                  * here since we're in the driver I/O path and
  64                  * outstanding I/O requests pin the dev_pagemap.
  65                  */
  66                 if (test_and_clear_pmem_poison(page))
  67                         clear_mce_nospec(pfn);
  68         }
  69 }
  70
  71 static blk_status_t pmem_clear_poison(struct pmem_device *pmem,
  72                 phys_addr_t offset, unsigned int len)
  73 {
  74         struct device *dev = to_dev(pmem);
  75         sector_t sector;
  76         long cleared;
  77         blk_status_t rc = BLK_STS_OK;
  78
  79         sector = (offset - pmem->data_offset) / 512;
  80
  81         cleared = nvdimm_clear_poison(dev, pmem->phys_addr + offset, len);
  82         if (cleared < len)
  83                 rc = BLK_STS_IOERR;
  84         if (cleared > 0 && cleared / 512) {
  85                 hwpoison_clear(pmem, pmem->phys_addr + offset, cleared);
  86                 cleared /= 512;
  87                 dev_dbg(dev, "%#llx clear %ld sector%s\n",
  88                                 (unsigned long long) sector, cleared,
  89                                 cleared > 1 ? "s" : "");
  90                 badblocks_clear(&pmem->bb, sector, cleared);
  91                 if (pmem->bb_state)
  92                         sysfs_notify_dirent(pmem->bb_state);
  93         }
  94
  95         arch_invalidate_pmem(pmem->virt_addr + offset, len);
  96
  97         return rc;
  98 }
  99
 100 static void write_pmem(void *pmem_addr, struct page *page,
 101                 unsigned int off, unsigned int len)
 102 {
 103         unsigned int chunk;
 104         void *mem;
 105
 106         while (len) {
 107                 mem = kmap_atomic(page);
 108                 chunk = min_t(unsigned int, len, PAGE_SIZE - off);
 109                 memcpy_flushcache(pmem_addr, mem + off, chunk);
 110                 kunmap_atomic(mem);
 111                 len -= chunk;
 112                 off = 0;
 113                 page++;
 114                 pmem_addr += chunk;
 115         }
 116 }
 117
 118 static blk_status_t read_pmem(struct page *page, unsigned int off,
 119                 void *pmem_addr, unsigned int len)
 120 {
 121         unsigned int chunk;
 122         unsigned long rem;
 123         void *mem;
 124
 125         while (len) {
 126                 mem = kmap_atomic(page);
 127                 chunk = min_t(unsigned int, len, PAGE_SIZE - off);
 128                 rem = memcpy_mcsafe(mem + off, pmem_addr, chunk);
 129                 kunmap_atomic(mem);
 130                 if (rem)
 131                         return BLK_STS_IOERR;
 132                 len -= chunk;
 133                 off = 0;
 134                 page++;
 135                 pmem_addr += chunk;
 136         }
 137         return BLK_STS_OK;
 138 }
 139
 140 static blk_status_t pmem_do_read(struct pmem_device *pmem,
 141                         struct page *page, unsigned int page_off,
 142                         sector_t sector, unsigned int len)
 143 {
 144         blk_status_t rc;
 145         phys_addr_t pmem_off = sector * 512 + pmem->data_offset;
 146         void *pmem_addr = pmem->virt_addr + pmem_off;
 147
 148         if (unlikely(is_bad_pmem(&pmem->bb, sector, len)))
 149                 return BLK_STS_IOERR;
 150
 151         rc = read_pmem(page, page_off, pmem_addr, len);
 152         flush_dcache_page(page);
 153         return rc;
 154 }
 155
 156 static blk_status_t pmem_do_write(struct pmem_device *pmem,
 157                         struct page *page, unsigned int page_off,
 158                         sector_t sector, unsigned int len)
 159 {
 160         blk_status_t rc = BLK_STS_OK;
 161         bool bad_pmem = false;
 162         phys_addr_t pmem_off = sector * 512 + pmem->data_offset;
 163         void *pmem_addr = pmem->virt_addr + pmem_off;
 164
 165         if (unlikely(is_bad_pmem(&pmem->bb, sector, len)))
 166                 bad_pmem = true;
 167
 168         /*
 169          * Note that we write the data both before and after
 170          * clearing poison.  The write before clear poison
 171          * handles situations where the latest written data is
 172          * preserved and the clear poison operation simply marks
 173          * the address range as valid without changing the data.
 174          * In this case application software can assume that an
 175          * interrupted write will either return the new good
 176          * data or an error.
 177          *
 178          * However, if pmem_clear_poison() leaves the data in an
 179          * indeterminate state we need to perform the write
 180          * after clear poison.
 181          */
 182         flush_dcache_page(page);
 183         write_pmem(pmem_addr, page, page_off, len);
 184         if (unlikely(bad_pmem)) {
 185                 rc = pmem_clear_poison(pmem, pmem_off, len);
 186                 write_pmem(pmem_addr, page, page_off, len);
 187         }
 188
 189         return rc;
 190 }
 191
 192 static blk_qc_t pmem_make_request(struct request_queue *q, struct bio *bio)
 193 {
 194         int ret = 0;
 195         blk_status_t rc = 0;
 196         bool do_acct;
 197         unsigned long start;
 198         struct bio_vec bvec;
 199         struct bvec_iter iter;
 200         struct pmem_device *pmem = bio->bi_disk->private_data;
 201         struct nd_region *nd_region = to_region(pmem);
 202
 203         if (bio->bi_opf & REQ_PREFLUSH)
 204                 ret = nvdimm_flush(nd_region, bio);
 205
 206         do_acct = blk_queue_io_stat(bio->bi_disk->queue);
 207         if (do_acct)
 208                 start = bio_start_io_acct(bio);
 209         bio_for_each_segment(bvec, bio, iter) {
 210                 if (op_is_write(bio_op(bio)))
 211                         rc = pmem_do_write(pmem, bvec.bv_page, bvec.bv_offset,
 212                                 iter.bi_sector, bvec.bv_len);
 213                 else
 214                         rc = pmem_do_read(pmem, bvec.bv_page, bvec.bv_offset,
 215                                 iter.bi_sector, bvec.bv_len);
 216                 if (rc) {
 217                         bio->bi_status = rc;
 218                         break;
 219                 }
 220         }
 221         if (do_acct)
 222                 bio_end_io_acct(bio, start);
 223
 224         if (bio->bi_opf & REQ_FUA)
 225                 ret = nvdimm_flush(nd_region, bio);
 226
 227         if (ret)
 228                 bio->bi_status = errno_to_blk_status(ret);
 229
 230         bio_endio(bio);
 231         return BLK_QC_T_NONE;
 232 }
 233
 234 static int pmem_rw_page(struct block_device *bdev, sector_t sector,
 235                        struct page *page, unsigned int op)
 236 {
 237         struct pmem_device *pmem = bdev->bd_disk->private_data;
 238         blk_status_t rc;
 239
 240         if (op_is_write(op))
 241                 rc = pmem_do_write(pmem, page, 0, sector,
 242                                    hpage_nr_pages(page) * PAGE_SIZE);
 243         else
 244                 rc = pmem_do_read(pmem, page, 0, sector,
 245                                    hpage_nr_pages(page) * PAGE_SIZE);
 246         /*
 247          * The ->rw_page interface is subtle and tricky.  The core
 248          * retries on any error, so we can only invoke page_endio() in
 249          * the successful completion case.  Otherwise, we'll see crashes
 250          * caused by double completion.
 251          */
 252         if (rc == 0)
 253                 page_endio(page, op_is_write(op), 0);
 254
 255         return blk_status_to_errno(rc);
 256 }
 257
 258 /* see "strong" declaration in tools/testing/nvdimm/pmem-dax.c */
 259 __weak long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff,
 260                 long nr_pages, void **kaddr, pfn_t *pfn)
 261 {
 262         resource_size_t offset = PFN_PHYS(pgoff) + pmem->data_offset;
 263
 264         if (unlikely(is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) / 512,
 265                                         PFN_PHYS(nr_pages))))
 266                 return -EIO;
 267
 268         if (kaddr)
 269                 *kaddr = pmem->virt_addr + offset;
 270         if (pfn)
 271                 *pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags);
 272
 273         /*
 274          * If badblocks are present, limit known good range to the
 275          * requested range.
 276          */
 277         if (unlikely(pmem->bb.count))
 278                 return nr_pages;
 279         return PHYS_PFN(pmem->size - pmem->pfn_pad - offset);
 280 }
 281
 282 static const struct block_device_operations pmem_fops = {
 283         .owner =                THIS_MODULE,
 284         .rw_page =              pmem_rw_page,
 285         .revalidate_disk =      nvdimm_revalidate_disk,
 286 };
 287
 288 static int pmem_dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff,
 289                                     size_t nr_pages)
 290 {
 291         struct pmem_device *pmem = dax_get_private(dax_dev);
 292
 293         return blk_status_to_errno(pmem_do_write(pmem, ZERO_PAGE(0), 0,
 294                                    PFN_PHYS(pgoff) >> SECTOR_SHIFT,
 295                                    PAGE_SIZE));
 296 }
 297
 298 static long pmem_dax_direct_access(struct dax_device *dax_dev,
 299                 pgoff_t pgoff, long nr_pages, void **kaddr, pfn_t *pfn)
 300 {
 301         struct pmem_device *pmem = dax_get_private(dax_dev);
 302
 303         return __pmem_direct_access(pmem, pgoff, nr_pages, kaddr, pfn);
 304 }
 305
 306 /*
 307  * Use the 'no check' versions of copy_from_iter_flushcache() and
 308  * copy_to_iter_mcsafe() to bypass HARDENED_USERCOPY overhead. Bounds
 309  * checking, both file offset and device offset, is handled by
 310  * dax_iomap_actor()
 311  */
 312 static size_t pmem_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff,
 313                 void *addr, size_t bytes, struct iov_iter *i)
 314 {
 315         return _copy_from_iter_flushcache(addr, bytes, i);
 316 }
 317
 318 static size_t pmem_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff,
 319                 void *addr, size_t bytes, struct iov_iter *i)
 320 {
 321         return _copy_to_iter_mcsafe(addr, bytes, i);
 322 }
 323
 324 static const struct dax_operations pmem_dax_ops = {
 325         .direct_access = pmem_dax_direct_access,
 326         .dax_supported = generic_fsdax_supported,
 327         .copy_from_iter = pmem_copy_from_iter,
 328         .copy_to_iter = pmem_copy_to_iter,
 329         .zero_page_range = pmem_dax_zero_page_range,
 330 };
 331
 332 static const struct attribute_group *pmem_attribute_groups[] = {
 333         &dax_attribute_group,
 334         NULL,
 335 };
 336
 337 static void pmem_pagemap_cleanup(struct dev_pagemap *pgmap)
 338 {
 339         struct request_queue *q =
 340                 container_of(pgmap->ref, struct request_queue, q_usage_counter);
 341
 342         blk_cleanup_queue(q);
 343 }
 344
 345 static void pmem_release_queue(void *pgmap)
 346 {
 347         pmem_pagemap_cleanup(pgmap);
 348 }
 349
 350 static void pmem_pagemap_kill(struct dev_pagemap *pgmap)
 351 {
 352         struct request_queue *q =
 353                 container_of(pgmap->ref, struct request_queue, q_usage_counter);
 354
 355         blk_freeze_queue_start(q);
 356 }
 357
 358 static void pmem_release_disk(void *__pmem)
 359 {
 360         struct pmem_device *pmem = __pmem;
 361
 362         kill_dax(pmem->dax_dev);
 363         put_dax(pmem->dax_dev);
 364         del_gendisk(pmem->disk);
 365         put_disk(pmem->disk);
 366 }
 367
 368 static const struct dev_pagemap_ops fsdax_pagemap_ops = {
 369         .kill                   = pmem_pagemap_kill,
 370         .cleanup                = pmem_pagemap_cleanup,
 371 };
 372
 373 static int pmem_attach_disk(struct device *dev,
 374                 struct nd_namespace_common *ndns)
 375 {
 376         struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
 377         struct nd_region *nd_region = to_nd_region(dev->parent);
 378         int nid = dev_to_node(dev), fua;
 379         struct resource *res = &nsio->res;
 380         struct resource bb_res;
 381         struct nd_pfn *nd_pfn = NULL;
 382         struct dax_device *dax_dev;
 383         struct nd_pfn_sb *pfn_sb;
 384         struct pmem_device *pmem;
 385         struct request_queue *q;
 386         struct device *gendev;
 387         struct gendisk *disk;
 388         void *addr;
 389         int rc;
 390         unsigned long flags = 0UL;
 391
 392         pmem = devm_kzalloc(dev, sizeof(*pmem), GFP_KERNEL);
 393         if (!pmem)
 394                 return -ENOMEM;
 395
 396         rc = devm_namespace_enable(dev, ndns, nd_info_block_reserve());
 397         if (rc)
 398                 return rc;
 399
 400         /* while nsio_rw_bytes is active, parse a pfn info block if present */
 401         if (is_nd_pfn(dev)) {
 402                 nd_pfn = to_nd_pfn(dev);
 403                 rc = nvdimm_setup_pfn(nd_pfn, &pmem->pgmap);
 404                 if (rc)
 405                         return rc;
 406         }
 407
 408         /* we're attaching a block device, disable raw namespace access */
 409         devm_namespace_disable(dev, ndns);
 410
 411         dev_set_drvdata(dev, pmem);
 412         pmem->phys_addr = res->start;
 413         pmem->size = resource_size(res);
 414         fua = nvdimm_has_flush(nd_region);
 415         if (!IS_ENABLED(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) || fua < 0) {
 416                 dev_warn(dev, "unable to guarantee persistence of writes\n");
 417                 fua = 0;
 418         }
 419
 420         if (!devm_request_mem_region(dev, res->start, resource_size(res),
 421                                 dev_name(&ndns->dev))) {
 422                 dev_warn(dev, "could not reserve region %pR\n", res);
 423                 return -EBUSY;
 424         }
 425
 426         q = blk_alloc_queue(pmem_make_request, dev_to_node(dev));
 427         if (!q)
 428                 return -ENOMEM;
 429
 430         pmem->pfn_flags = PFN_DEV;
 431         pmem->pgmap.ref = &q->q_usage_counter;
 432         if (is_nd_pfn(dev)) {
 433                 pmem->pgmap.type = MEMORY_DEVICE_FS_DAX;
 434                 pmem->pgmap.ops = &fsdax_pagemap_ops;
 435                 addr = devm_memremap_pages(dev, &pmem->pgmap);
 436                 pfn_sb = nd_pfn->pfn_sb;
 437                 pmem->data_offset = le64_to_cpu(pfn_sb->dataoff);
 438                 pmem->pfn_pad = resource_size(res) -
 439                         resource_size(&pmem->pgmap.res);
 440                 pmem->pfn_flags |= PFN_MAP;
 441                 memcpy(&bb_res, &pmem->pgmap.res, sizeof(bb_res));
 442                 bb_res.start += pmem->data_offset;
 443         } else if (pmem_should_map_pages(dev)) {
 444                 memcpy(&pmem->pgmap.res, &nsio->res, sizeof(pmem->pgmap.res));
 445                 pmem->pgmap.type = MEMORY_DEVICE_FS_DAX;
 446                 pmem->pgmap.ops = &fsdax_pagemap_ops;
 447                 addr = devm_memremap_pages(dev, &pmem->pgmap);
 448                 pmem->pfn_flags |= PFN_MAP;
 449                 memcpy(&bb_res, &pmem->pgmap.res, sizeof(bb_res));
 450         } else {
 451                 if (devm_add_action_or_reset(dev, pmem_release_queue,
 452                                         &pmem->pgmap))
 453                         return -ENOMEM;
 454                 addr = devm_memremap(dev, pmem->phys_addr,
 455                                 pmem->size, ARCH_MEMREMAP_PMEM);
 456                 memcpy(&bb_res, &nsio->res, sizeof(bb_res));
 457         }
 458
 459         if (IS_ERR(addr))
 460                 return PTR_ERR(addr);
 461         pmem->virt_addr = addr;
 462
 463         blk_queue_write_cache(q, true, fua);
 464         blk_queue_physical_block_size(q, PAGE_SIZE);
 465         blk_queue_logical_block_size(q, pmem_sector_size(ndns));
 466         blk_queue_max_hw_sectors(q, UINT_MAX);
 467         blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
 468         if (pmem->pfn_flags & PFN_MAP)
 469                 blk_queue_flag_set(QUEUE_FLAG_DAX, q);
 470
 471         disk = alloc_disk_node(0, nid);
 472         if (!disk)
 473                 return -ENOMEM;
 474         pmem->disk = disk;
 475
 476         disk->fops              = &pmem_fops;
 477         disk->queue             = q;
 478         disk->flags             = GENHD_FL_EXT_DEVT;
 479         disk->private_data      = pmem;
 480         disk->queue->backing_dev_info->capabilities |= BDI_CAP_SYNCHRONOUS_IO;
 481         nvdimm_namespace_disk_name(ndns, disk->disk_name);
 482         set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset)
 483                         / 512);
 484         if (devm_init_badblocks(dev, &pmem->bb))
 485                 return -ENOMEM;
 486         nvdimm_badblocks_populate(nd_region, &pmem->bb, &bb_res);
 487         disk->bb = &pmem->bb;
 488
 489         if (is_nvdimm_sync(nd_region))
 490                 flags = DAXDEV_F_SYNC;
 491         dax_dev = alloc_dax(pmem, disk->disk_name, &pmem_dax_ops, flags);
 492         if (IS_ERR(dax_dev)) {
 493                 put_disk(disk);
 494                 return PTR_ERR(dax_dev);
 495         }
 496         dax_write_cache(dax_dev, nvdimm_has_cache(nd_region));
 497         pmem->dax_dev = dax_dev;
 498         gendev = disk_to_dev(disk);
 499         gendev->groups = pmem_attribute_groups;
 500
 501         device_add_disk(dev, disk, NULL);
 502         if (devm_add_action_or_reset(dev, pmem_release_disk, pmem))
 503                 return -ENOMEM;
 504
 505         revalidate_disk(disk);
 506
 507         pmem->bb_state = sysfs_get_dirent(disk_to_dev(disk)->kobj.sd,
 508                                           "badblocks");
 509         if (!pmem->bb_state)
 510                 dev_warn(dev, "'badblocks' notification disabled\n");
 511
 512         return 0;
 513 }
 514
 515 static int nd_pmem_probe(struct device *dev)
 516 {
 517         int ret;
 518         struct nd_namespace_common *ndns;
 519
 520         ndns = nvdimm_namespace_common_probe(dev);
 521         if (IS_ERR(ndns))
 522                 return PTR_ERR(ndns);
 523
 524         if (is_nd_btt(dev))
 525                 return nvdimm_namespace_attach_btt(ndns);
 526
 527         if (is_nd_pfn(dev))
 528                 return pmem_attach_disk(dev, ndns);
 529
 530         ret = devm_namespace_enable(dev, ndns, nd_info_block_reserve());
 531         if (ret)
 532                 return ret;
 533
 534         ret = nd_btt_probe(dev, ndns);
 535         if (ret == 0)
 536                 return -ENXIO;
 537
 538         /*
 539          * We have two failure conditions here, there is no
 540          * info reserver block or we found a valid info reserve block
 541          * but failed to initialize the pfn superblock.
 542          *
 543          * For the first case consider namespace as a raw pmem namespace
 544          * and attach a disk.
 545          *
 546          * For the latter, consider this a success and advance the namespace
 547          * seed.
 548          */
 549         ret = nd_pfn_probe(dev, ndns);
 550         if (ret == 0)
 551                 return -ENXIO;
 552         else if (ret == -EOPNOTSUPP)
 553                 return ret;
 554
 555         ret = nd_dax_probe(dev, ndns);
 556         if (ret == 0)
 557                 return -ENXIO;
 558         else if (ret == -EOPNOTSUPP)
 559                 return ret;
 560
 561         /* probe complete, attach handles namespace enabling */
 562         devm_namespace_disable(dev, ndns);
 563
 564         return pmem_attach_disk(dev, ndns);
 565 }
 566
 567 static int nd_pmem_remove(struct device *dev)
 568 {
 569         struct pmem_device *pmem = dev_get_drvdata(dev);
 570
 571         if (is_nd_btt(dev))
 572                 nvdimm_namespace_detach_btt(to_nd_btt(dev));
 573         else {
 574                 /*
 575                  * Note, this assumes nd_device_lock() context to not
 576                  * race nd_pmem_notify()
 577                  */
 578                 sysfs_put(pmem->bb_state);
 579                 pmem->bb_state = NULL;
 580         }
 581         nvdimm_flush(to_nd_region(dev->parent), NULL);
 582
 583         return 0;
 584 }
 585
 586 static void nd_pmem_shutdown(struct device *dev)
 587 {
 588         nvdimm_flush(to_nd_region(dev->parent), NULL);
 589 }
 590
 591 static void nd_pmem_notify(struct device *dev, enum nvdimm_event event)
 592 {
 593         struct nd_region *nd_region;
 594         resource_size_t offset = 0, end_trunc = 0;
 595         struct nd_namespace_common *ndns;
 596         struct nd_namespace_io *nsio;
 597         struct resource res;
 598         struct badblocks *bb;
 599         struct kernfs_node *bb_state;
 600
 601         if (event != NVDIMM_REVALIDATE_POISON)
 602                 return;
 603
 604         if (is_nd_btt(dev)) {
 605                 struct nd_btt *nd_btt = to_nd_btt(dev);
 606
 607                 ndns = nd_btt->ndns;
 608                 nd_region = to_nd_region(ndns->dev.parent);
 609                 nsio = to_nd_namespace_io(&ndns->dev);
 610                 bb = &nsio->bb;
 611                 bb_state = NULL;
 612         } else {
 613                 struct pmem_device *pmem = dev_get_drvdata(dev);
 614
 615                 nd_region = to_region(pmem);
 616                 bb = &pmem->bb;
 617                 bb_state = pmem->bb_state;
 618
 619                 if (is_nd_pfn(dev)) {
 620                         struct nd_pfn *nd_pfn = to_nd_pfn(dev);
 621                         struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
 622
 623                         ndns = nd_pfn->ndns;
 624                         offset = pmem->data_offset +
 625                                         __le32_to_cpu(pfn_sb->start_pad);
 626                         end_trunc = __le32_to_cpu(pfn_sb->end_trunc);
 627                 } else {
 628                         ndns = to_ndns(dev);
 629                 }
 630
 631                 nsio = to_nd_namespace_io(&ndns->dev);
 632         }
 633
 634         res.start = nsio->res.start + offset;
 635         res.end = nsio->res.end - end_trunc;
 636         nvdimm_badblocks_populate(nd_region, bb, &res);
 637         if (bb_state)
 638                 sysfs_notify_dirent(bb_state);
 639 }
 640
 641 MODULE_ALIAS("pmem");
 642 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_IO);
 643 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_PMEM);
 644 static struct nd_device_driver nd_pmem_driver = {
 645         .probe = nd_pmem_probe,
 646         .remove = nd_pmem_remove,
 647         .notify = nd_pmem_notify,
 648         .shutdown = nd_pmem_shutdown,
 649         .drv = {
 650                 .name = "nd_pmem",
 651         },
 652         .type = ND_DRIVER_NAMESPACE_IO | ND_DRIVER_NAMESPACE_PMEM,
 653 };
 654
 655 module_nd_driver(nd_pmem_driver);
 656
 657 MODULE_AUTHOR("Ross Zwisler <ross.zwisler@linux.intel.com>");
 658 MODULE_LICENSE("GPL v2");