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