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 = copy_mc_to_kernel(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_submit_bio(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, thp_size(page));
 242         else
 243                 rc = pmem_do_read(pmem, page, 0, sector, thp_size(page));
 244         /*
 245          * The ->rw_page interface is subtle and tricky.  The core
 246          * retries on any error, so we can only invoke page_endio() in
 247          * the successful completion case.  Otherwise, we'll see crashes
 248          * caused by double completion.
 249          */
 250         if (rc == 0)
 251                 page_endio(page, op_is_write(op), 0);
 252
 253         return blk_status_to_errno(rc);
 254 }
 255
 256 /* see "strong" declaration in tools/testing/nvdimm/pmem-dax.c */
 257 __weak long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff,
 258                 long nr_pages, void **kaddr, pfn_t *pfn)
 259 {
 260         resource_size_t offset = PFN_PHYS(pgoff) + pmem->data_offset;
 261
 262         if (unlikely(is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) / 512,
 263                                         PFN_PHYS(nr_pages))))
 264                 return -EIO;
 265
 266         if (kaddr)
 267                 *kaddr = pmem->virt_addr + offset;
 268         if (pfn)
 269                 *pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags);
 270
 271         /*
 272          * If badblocks are present, limit known good range to the
 273          * requested range.
 274          */
 275         if (unlikely(pmem->bb.count))
 276                 return nr_pages;
 277         return PHYS_PFN(pmem->size - pmem->pfn_pad - offset);
 278 }
 279
 280 static const struct block_device_operations pmem_fops = {
 281         .owner =                THIS_MODULE,
 282         .submit_bio =           pmem_submit_bio,
 283         .rw_page =              pmem_rw_page,
 284         .revalidate_disk =      nvdimm_revalidate_disk,
 285 };
 286
 287 static int pmem_dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff,
 288                                     size_t nr_pages)
 289 {
 290         struct pmem_device *pmem = dax_get_private(dax_dev);
 291
 292         return blk_status_to_errno(pmem_do_write(pmem, ZERO_PAGE(0), 0,
 293                                    PFN_PHYS(pgoff) >> SECTOR_SHIFT,
 294                                    PAGE_SIZE));
 295 }
 296
 297 static long pmem_dax_direct_access(struct dax_device *dax_dev,
 298                 pgoff_t pgoff, long nr_pages, void **kaddr, pfn_t *pfn)
 299 {
 300         struct pmem_device *pmem = dax_get_private(dax_dev);
 301
 302         return __pmem_direct_access(pmem, pgoff, nr_pages, kaddr, pfn);
 303 }
 304
 305 /*
 306  * Use the 'no check' versions of copy_from_iter_flushcache() and
 307  * copy_mc_to_iter() to bypass HARDENED_USERCOPY overhead. Bounds
 308  * checking, both file offset and device offset, is handled by
 309  * dax_iomap_actor()
 310  */
 311 static size_t pmem_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff,
 312                 void *addr, size_t bytes, struct iov_iter *i)
 313 {
 314         return _copy_from_iter_flushcache(addr, bytes, i);
 315 }
 316
 317 static size_t pmem_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff,
 318                 void *addr, size_t bytes, struct iov_iter *i)
 319 {
 320         return _copy_mc_to_iter(addr, bytes, i);
 321 }
 322
 323 static const struct dax_operations pmem_dax_ops = {
 324         .direct_access = pmem_dax_direct_access,
 325         .dax_supported = generic_fsdax_supported,
 326         .copy_from_iter = pmem_copy_from_iter,
 327         .copy_to_iter = pmem_copy_to_iter,
 328         .zero_page_range = pmem_dax_zero_page_range,
 329 };
 330
 331 static const struct attribute_group *pmem_attribute_groups[] = {
 332         &dax_attribute_group,
 333         NULL,
 334 };
 335
 336 static void pmem_pagemap_cleanup(struct dev_pagemap *pgmap)
 337 {
 338         struct request_queue *q =
 339                 container_of(pgmap->ref, struct request_queue, q_usage_counter);
 340
 341         blk_cleanup_queue(q);
 342 }
 343
 344 static void pmem_release_queue(void *pgmap)
 345 {
 346         pmem_pagemap_cleanup(pgmap);
 347 }
 348
 349 static void pmem_pagemap_kill(struct dev_pagemap *pgmap)
 350 {
 351         struct request_queue *q =
 352                 container_of(pgmap->ref, struct request_queue, q_usage_counter);
 353
 354         blk_freeze_queue_start(q);
 355 }
 356
 357 static void pmem_release_disk(void *__pmem)
 358 {
 359         struct pmem_device *pmem = __pmem;
 360
 361         kill_dax(pmem->dax_dev);
 362         put_dax(pmem->dax_dev);
 363         del_gendisk(pmem->disk);
 364         put_disk(pmem->disk);
 365 }
 366
 367 static const struct dev_pagemap_ops fsdax_pagemap_ops = {
 368         .kill                   = pmem_pagemap_kill,
 369         .cleanup                = pmem_pagemap_cleanup,
 370 };
 371
 372 static int pmem_attach_disk(struct device *dev,
 373                 struct nd_namespace_common *ndns)
 374 {
 375         struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
 376         struct nd_region *nd_region = to_nd_region(dev->parent);
 377         int nid = dev_to_node(dev), fua;
 378         struct resource *res = &nsio->res;
 379         struct resource bb_res;
 380         struct nd_pfn *nd_pfn = NULL;
 381         struct dax_device *dax_dev;
 382         struct nd_pfn_sb *pfn_sb;
 383         struct pmem_device *pmem;
 384         struct request_queue *q;
 385         struct device *gendev;
 386         struct gendisk *disk;
 387         void *addr;
 388         int rc;
 389         unsigned long flags = 0UL;
 390
 391         pmem = devm_kzalloc(dev, sizeof(*pmem), GFP_KERNEL);
 392         if (!pmem)
 393                 return -ENOMEM;
 394
 395         rc = devm_namespace_enable(dev, ndns, nd_info_block_reserve());
 396         if (rc)
 397                 return rc;
 398
 399         /* while nsio_rw_bytes is active, parse a pfn info block if present */
 400         if (is_nd_pfn(dev)) {
 401                 nd_pfn = to_nd_pfn(dev);
 402                 rc = nvdimm_setup_pfn(nd_pfn, &pmem->pgmap);
 403                 if (rc)
 404                         return rc;
 405         }
 406
 407         /* we're attaching a block device, disable raw namespace access */
 408         devm_namespace_disable(dev, ndns);
 409
 410         dev_set_drvdata(dev, pmem);
 411         pmem->phys_addr = res->start;
 412         pmem->size = resource_size(res);
 413         fua = nvdimm_has_flush(nd_region);
 414         if (!IS_ENABLED(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) || fua < 0) {
 415                 dev_warn(dev, "unable to guarantee persistence of writes\n");
 416                 fua = 0;
 417         }
 418
 419         if (!devm_request_mem_region(dev, res->start, resource_size(res),
 420                                 dev_name(&ndns->dev))) {
 421                 dev_warn(dev, "could not reserve region %pR\n", res);
 422                 return -EBUSY;
 423         }
 424
 425         q = blk_alloc_queue(dev_to_node(dev));
 426         if (!q)
 427                 return -ENOMEM;
 428
 429         pmem->pfn_flags = PFN_DEV;
 430         pmem->pgmap.ref = &q->q_usage_counter;
 431         if (is_nd_pfn(dev)) {
 432                 pmem->pgmap.type = MEMORY_DEVICE_FS_DAX;
 433                 pmem->pgmap.ops = &fsdax_pagemap_ops;
 434                 addr = devm_memremap_pages(dev, &pmem->pgmap);
 435                 pfn_sb = nd_pfn->pfn_sb;
 436                 pmem->data_offset = le64_to_cpu(pfn_sb->dataoff);
 437                 pmem->pfn_pad = resource_size(res) -
 438                         resource_size(&pmem->pgmap.res);
 439                 pmem->pfn_flags |= PFN_MAP;
 440                 memcpy(&bb_res, &pmem->pgmap.res, sizeof(bb_res));
 441                 bb_res.start += pmem->data_offset;
 442         } else if (pmem_should_map_pages(dev)) {
 443                 memcpy(&pmem->pgmap.res, &nsio->res, sizeof(pmem->pgmap.res));
 444                 pmem->pgmap.type = MEMORY_DEVICE_FS_DAX;
 445                 pmem->pgmap.ops = &fsdax_pagemap_ops;
 446                 addr = devm_memremap_pages(dev, &pmem->pgmap);
 447                 pmem->pfn_flags |= PFN_MAP;
 448                 memcpy(&bb_res, &pmem->pgmap.res, sizeof(bb_res));
 449         } else {
 450                 if (devm_add_action_or_reset(dev, pmem_release_queue,
 451                                         &pmem->pgmap))
 452                         return -ENOMEM;
 453                 addr = devm_memremap(dev, pmem->phys_addr,
 454                                 pmem->size, ARCH_MEMREMAP_PMEM);
 455                 memcpy(&bb_res, &nsio->res, sizeof(bb_res));
 456         }
 457
 458         if (IS_ERR(addr))
 459                 return PTR_ERR(addr);
 460         pmem->virt_addr = addr;
 461
 462         blk_queue_write_cache(q, true, fua);
 463         blk_queue_physical_block_size(q, PAGE_SIZE);
 464         blk_queue_logical_block_size(q, pmem_sector_size(ndns));
 465         blk_queue_max_hw_sectors(q, UINT_MAX);
 466         blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
 467         if (pmem->pfn_flags & PFN_MAP)
 468                 blk_queue_flag_set(QUEUE_FLAG_DAX, q);
 469
 470         disk = alloc_disk_node(0, nid);
 471         if (!disk)
 472                 return -ENOMEM;
 473         pmem->disk = disk;
 474
 475         disk->fops              = &pmem_fops;
 476         disk->queue             = q;
 477         disk->flags             = GENHD_FL_EXT_DEVT;
 478         disk->private_data      = pmem;
 479         disk->queue->backing_dev_info->capabilities |= BDI_CAP_SYNCHRONOUS_IO;
 480         nvdimm_namespace_disk_name(ndns, disk->disk_name);
 481         set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset)
 482                         / 512);
 483         if (devm_init_badblocks(dev, &pmem->bb))
 484                 return -ENOMEM;
 485         nvdimm_badblocks_populate(nd_region, &pmem->bb, &bb_res);
 486         disk->bb = &pmem->bb;
 487
 488         if (is_nvdimm_sync(nd_region))
 489                 flags = DAXDEV_F_SYNC;
 490         dax_dev = alloc_dax(pmem, disk->disk_name, &pmem_dax_ops, flags);
 491         if (IS_ERR(dax_dev)) {
 492                 put_disk(disk);
 493                 return PTR_ERR(dax_dev);
 494         }
 495         dax_write_cache(dax_dev, nvdimm_has_cache(nd_region));
 496         pmem->dax_dev = dax_dev;
 497         gendev = disk_to_dev(disk);
 498         gendev->groups = pmem_attribute_groups;
 499
 500         device_add_disk(dev, disk, NULL);
 501         if (devm_add_action_or_reset(dev, pmem_release_disk, pmem))
 502                 return -ENOMEM;
 503
 504         revalidate_disk(disk);
 505
 506         pmem->bb_state = sysfs_get_dirent(disk_to_dev(disk)->kobj.sd,
 507                                           "badblocks");
 508         if (!pmem->bb_state)
 509                 dev_warn(dev, "'badblocks' notification disabled\n");
 510
 511         return 0;
 512 }
 513
 514 static int nd_pmem_probe(struct device *dev)
 515 {
 516         int ret;
 517         struct nd_namespace_common *ndns;
 518
 519         ndns = nvdimm_namespace_common_probe(dev);
 520         if (IS_ERR(ndns))
 521                 return PTR_ERR(ndns);
 522
 523         if (is_nd_btt(dev))
 524                 return nvdimm_namespace_attach_btt(ndns);
 525
 526         if (is_nd_pfn(dev))
 527                 return pmem_attach_disk(dev, ndns);
 528
 529         ret = devm_namespace_enable(dev, ndns, nd_info_block_reserve());
 530         if (ret)
 531                 return ret;
 532
 533         ret = nd_btt_probe(dev, ndns);
 534         if (ret == 0)
 535                 return -ENXIO;
 536
 537         /*
 538          * We have two failure conditions here, there is no
 539          * info reserver block or we found a valid info reserve block
 540          * but failed to initialize the pfn superblock.
 541          *
 542          * For the first case consider namespace as a raw pmem namespace
 543          * and attach a disk.
 544          *
 545          * For the latter, consider this a success and advance the namespace
 546          * seed.
 547          */
 548         ret = nd_pfn_probe(dev, ndns);
 549         if (ret == 0)
 550                 return -ENXIO;
 551         else if (ret == -EOPNOTSUPP)
 552                 return ret;
 553
 554         ret = nd_dax_probe(dev, ndns);
 555         if (ret == 0)
 556                 return -ENXIO;
 557         else if (ret == -EOPNOTSUPP)
 558                 return ret;
 559
 560         /* probe complete, attach handles namespace enabling */
 561         devm_namespace_disable(dev, ndns);
 562
 563         return pmem_attach_disk(dev, ndns);
 564 }
 565
 566 static int nd_pmem_remove(struct device *dev)
 567 {
 568         struct pmem_device *pmem = dev_get_drvdata(dev);
 569
 570         if (is_nd_btt(dev))
 571                 nvdimm_namespace_detach_btt(to_nd_btt(dev));
 572         else {
 573                 /*
 574                  * Note, this assumes nd_device_lock() context to not
 575                  * race nd_pmem_notify()
 576                  */
 577                 sysfs_put(pmem->bb_state);
 578                 pmem->bb_state = NULL;
 579         }
 580         nvdimm_flush(to_nd_region(dev->parent), NULL);
 581
 582         return 0;
 583 }
 584
 585 static void nd_pmem_shutdown(struct device *dev)
 586 {
 587         nvdimm_flush(to_nd_region(dev->parent), NULL);
 588 }
 589
 590 static void nd_pmem_notify(struct device *dev, enum nvdimm_event event)
 591 {
 592         struct nd_region *nd_region;
 593         resource_size_t offset = 0, end_trunc = 0;
 594         struct nd_namespace_common *ndns;
 595         struct nd_namespace_io *nsio;
 596         struct resource res;
 597         struct badblocks *bb;
 598         struct kernfs_node *bb_state;
 599
 600         if (event != NVDIMM_REVALIDATE_POISON)
 601                 return;
 602
 603         if (is_nd_btt(dev)) {
 604                 struct nd_btt *nd_btt = to_nd_btt(dev);
 605
 606                 ndns = nd_btt->ndns;
 607                 nd_region = to_nd_region(ndns->dev.parent);
 608                 nsio = to_nd_namespace_io(&ndns->dev);
 609                 bb = &nsio->bb;
 610                 bb_state = NULL;
 611         } else {
 612                 struct pmem_device *pmem = dev_get_drvdata(dev);
 613
 614                 nd_region = to_region(pmem);
 615                 bb = &pmem->bb;
 616                 bb_state = pmem->bb_state;
 617
 618                 if (is_nd_pfn(dev)) {
 619                         struct nd_pfn *nd_pfn = to_nd_pfn(dev);
 620                         struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
 621
 622                         ndns = nd_pfn->ndns;
 623                         offset = pmem->data_offset +
 624                                         __le32_to_cpu(pfn_sb->start_pad);
 625                         end_trunc = __le32_to_cpu(pfn_sb->end_trunc);
 626                 } else {
 627                         ndns = to_ndns(dev);
 628                 }
 629
 630                 nsio = to_nd_namespace_io(&ndns->dev);
 631         }
 632
 633         res.start = nsio->res.start + offset;
 634         res.end = nsio->res.end - end_trunc;
 635         nvdimm_badblocks_populate(nd_region, bb, &res);
 636         if (bb_state)
 637                 sysfs_notify_dirent(bb_state);
 638 }
 639
 640 MODULE_ALIAS("pmem");
 641 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_IO);
 642 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_PMEM);
 643 static struct nd_device_driver nd_pmem_driver = {
 644         .probe = nd_pmem_probe,
 645         .remove = nd_pmem_remove,
 646         .notify = nd_pmem_notify,
 647         .shutdown = nd_pmem_shutdown,
 648         .drv = {
 649                 .name = "nd_pmem",
 650         },
 651         .type = ND_DRIVER_NAMESPACE_IO | ND_DRIVER_NAMESPACE_PMEM,
 652 };
 653
 654 module_nd_driver(nd_pmem_driver);
 655
 656 MODULE_AUTHOR("Ross Zwisler <ross.zwisler@linux.intel.com>");
 657 MODULE_LICENSE("GPL v2");