drivers/nvdimm/pmem.c

   1 /*
   2  * Persistent Memory Driver
   3  *
   4  * Copyright (c) 2014-2015, Intel Corporation.
   5  * Copyright (c) 2015, Christoph Hellwig <hch@lst.de>.
   6  * Copyright (c) 2015, Boaz Harrosh <boaz@plexistor.com>.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms and conditions of the GNU General Public License,
  10  * version 2, as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  */
  17
  18 #include <asm/cacheflush.h>
  19 #include <linux/blkdev.h>
  20 #include <linux/hdreg.h>
  21 #include <linux/init.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/module.h>
  24 #include <linux/moduleparam.h>
  25 #include <linux/badblocks.h>
  26 #include <linux/memremap.h>
  27 #include <linux/vmalloc.h>
  28 #include <linux/pfn_t.h>
  29 #include <linux/slab.h>
  30 #include <linux/pmem.h>
  31 #include <linux/nd.h>
  32 #include "pfn.h"
  33 #include "nd.h"
  34
  35 struct pmem_device {
  36         struct request_queue    *pmem_queue;
  37         struct gendisk          *pmem_disk;
  38         struct nd_namespace_common *ndns;
  39
  40         /* One contiguous memory region per device */
  41         phys_addr_t             phys_addr;
  42         /* when non-zero this device is hosting a 'pfn' instance */
  43         phys_addr_t             data_offset;
  44         u64                     pfn_flags;
  45         void __pmem             *virt_addr;
  46         /* immutable base size of the namespace */
  47         size_t                  size;
  48         /* trim size when namespace capacity has been section aligned */
  49         u32                     pfn_pad;
  50         struct badblocks        bb;
  51 };
  52
  53 static bool is_bad_pmem(struct badblocks *bb, sector_t sector, unsigned int len)
  54 {
  55         if (bb->count) {
  56                 sector_t first_bad;
  57                 int num_bad;
  58
  59                 return !!badblocks_check(bb, sector, len / 512, &first_bad,
  60                                 &num_bad);
  61         }
  62
  63         return false;
  64 }
  65
  66 static void pmem_clear_poison(struct pmem_device *pmem, phys_addr_t offset,
  67                 unsigned int len)
  68 {
  69         struct device *dev = disk_to_dev(pmem->pmem_disk);
  70         sector_t sector;
  71         long cleared;
  72
  73         sector = (offset - pmem->data_offset) / 512;
  74         cleared = nvdimm_clear_poison(dev, pmem->phys_addr + offset, len);
  75
  76         if (cleared > 0 && cleared / 512) {
  77                 dev_dbg(dev, "%s: %llx clear %ld sector%s\n",
  78                                 __func__, (unsigned long long) sector,
  79                                 cleared / 512, cleared / 512 > 1 ? "s" : "");
  80                 badblocks_clear(&pmem->bb, sector, cleared / 512);
  81         }
  82         invalidate_pmem(pmem->virt_addr + offset, len);
  83 }
  84
  85 static int pmem_do_bvec(struct pmem_device *pmem, struct page *page,
  86                         unsigned int len, unsigned int off, int rw,
  87                         sector_t sector)
  88 {
  89         int rc = 0;
  90         bool bad_pmem = false;
  91         void *mem = kmap_atomic(page);
  92         phys_addr_t pmem_off = sector * 512 + pmem->data_offset;
  93         void __pmem *pmem_addr = pmem->virt_addr + pmem_off;
  94
  95         if (unlikely(is_bad_pmem(&pmem->bb, sector, len)))
  96                 bad_pmem = true;
  97
  98         if (rw == READ) {
  99                 if (unlikely(bad_pmem))
 100                         rc = -EIO;
 101                 else {
 102                         rc = memcpy_from_pmem(mem + off, pmem_addr, len);
 103                         flush_dcache_page(page);
 104                 }
 105         } else {
 106                 flush_dcache_page(page);
 107                 memcpy_to_pmem(pmem_addr, mem + off, len);
 108                 if (unlikely(bad_pmem)) {
 109                         pmem_clear_poison(pmem, pmem_off, len);
 110                         memcpy_to_pmem(pmem_addr, mem + off, len);
 111                 }
 112         }
 113
 114         kunmap_atomic(mem);
 115         return rc;
 116 }
 117
 118 static blk_qc_t pmem_make_request(struct request_queue *q, struct bio *bio)
 119 {
 120         int rc = 0;
 121         bool do_acct;
 122         unsigned long start;
 123         struct bio_vec bvec;
 124         struct bvec_iter iter;
 125         struct block_device *bdev = bio->bi_bdev;
 126         struct pmem_device *pmem = bdev->bd_disk->private_data;
 127
 128         do_acct = nd_iostat_start(bio, &start);
 129         bio_for_each_segment(bvec, bio, iter) {
 130                 rc = pmem_do_bvec(pmem, bvec.bv_page, bvec.bv_len,
 131                                 bvec.bv_offset, bio_data_dir(bio),
 132                                 iter.bi_sector);
 133                 if (rc) {
 134                         bio->bi_error = rc;
 135                         break;
 136                 }
 137         }
 138         if (do_acct)
 139                 nd_iostat_end(bio, start);
 140
 141         if (bio_data_dir(bio))
 142                 wmb_pmem();
 143
 144         bio_endio(bio);
 145         return BLK_QC_T_NONE;
 146 }
 147
 148 static int pmem_rw_page(struct block_device *bdev, sector_t sector,
 149                        struct page *page, int rw)
 150 {
 151         struct pmem_device *pmem = bdev->bd_disk->private_data;
 152         int rc;
 153
 154         rc = pmem_do_bvec(pmem, page, PAGE_SIZE, 0, rw, sector);
 155         if (rw & WRITE)
 156                 wmb_pmem();
 157
 158         /*
 159          * The ->rw_page interface is subtle and tricky.  The core
 160          * retries on any error, so we can only invoke page_endio() in
 161          * the successful completion case.  Otherwise, we'll see crashes
 162          * caused by double completion.
 163          */
 164         if (rc == 0)
 165                 page_endio(page, rw & WRITE, 0);
 166
 167         return rc;
 168 }
 169
 170 static long pmem_direct_access(struct block_device *bdev, sector_t sector,
 171                       void __pmem **kaddr, pfn_t *pfn)
 172 {
 173         struct pmem_device *pmem = bdev->bd_disk->private_data;
 174         resource_size_t offset = sector * 512 + pmem->data_offset;
 175
 176         *kaddr = pmem->virt_addr + offset;
 177         *pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags);
 178
 179         return pmem->size - pmem->pfn_pad - offset;
 180 }
 181
 182 static const struct block_device_operations pmem_fops = {
 183         .owner =                THIS_MODULE,
 184         .rw_page =              pmem_rw_page,
 185         .direct_access =        pmem_direct_access,
 186         .revalidate_disk =      nvdimm_revalidate_disk,
 187 };
 188
 189 static struct pmem_device *pmem_alloc(struct device *dev,
 190                 struct resource *res, int id)
 191 {
 192         struct pmem_device *pmem;
 193         struct request_queue *q;
 194
 195         pmem = devm_kzalloc(dev, sizeof(*pmem), GFP_KERNEL);
 196         if (!pmem)
 197                 return ERR_PTR(-ENOMEM);
 198
 199         pmem->phys_addr = res->start;
 200         pmem->size = resource_size(res);
 201         if (!arch_has_wmb_pmem())
 202                 dev_warn(dev, "unable to guarantee persistence of writes\n");
 203
 204         if (!devm_request_mem_region(dev, pmem->phys_addr, pmem->size,
 205                         dev_name(dev))) {
 206                 dev_warn(dev, "could not reserve region [0x%pa:0x%zx]\n",
 207                                 &pmem->phys_addr, pmem->size);
 208                 return ERR_PTR(-EBUSY);
 209         }
 210
 211         q = blk_alloc_queue_node(GFP_KERNEL, dev_to_node(dev));
 212         if (!q)
 213                 return ERR_PTR(-ENOMEM);
 214
 215         pmem->pfn_flags = PFN_DEV;
 216         if (pmem_should_map_pages(dev)) {
 217                 pmem->virt_addr = (void __pmem *) devm_memremap_pages(dev, res,
 218                                 &q->q_usage_counter, NULL);
 219                 pmem->pfn_flags |= PFN_MAP;
 220         } else
 221                 pmem->virt_addr = (void __pmem *) devm_memremap(dev,
 222                                 pmem->phys_addr, pmem->size,
 223                                 ARCH_MEMREMAP_PMEM);
 224
 225         if (IS_ERR(pmem->virt_addr)) {
 226                 blk_cleanup_queue(q);
 227                 return (void __force *) pmem->virt_addr;
 228         }
 229
 230         pmem->pmem_queue = q;
 231         return pmem;
 232 }
 233
 234 static void pmem_detach_disk(struct pmem_device *pmem)
 235 {
 236         if (!pmem->pmem_disk)
 237                 return;
 238
 239         del_gendisk(pmem->pmem_disk);
 240         put_disk(pmem->pmem_disk);
 241         blk_cleanup_queue(pmem->pmem_queue);
 242 }
 243
 244 static int pmem_attach_disk(struct device *dev,
 245                 struct nd_namespace_common *ndns, struct pmem_device *pmem)
 246 {
 247         struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
 248         int nid = dev_to_node(dev);
 249         struct resource bb_res;
 250         struct gendisk *disk;
 251
 252         blk_queue_make_request(pmem->pmem_queue, pmem_make_request);
 253         blk_queue_physical_block_size(pmem->pmem_queue, PAGE_SIZE);
 254         blk_queue_max_hw_sectors(pmem->pmem_queue, UINT_MAX);
 255         blk_queue_bounce_limit(pmem->pmem_queue, BLK_BOUNCE_ANY);
 256         queue_flag_set_unlocked(QUEUE_FLAG_NONROT, pmem->pmem_queue);
 257
 258         disk = alloc_disk_node(0, nid);
 259         if (!disk) {
 260                 blk_cleanup_queue(pmem->pmem_queue);
 261                 return -ENOMEM;
 262         }
 263
 264         disk->fops              = &pmem_fops;
 265         disk->private_data      = pmem;
 266         disk->queue             = pmem->pmem_queue;
 267         disk->flags             = GENHD_FL_EXT_DEVT;
 268         nvdimm_namespace_disk_name(ndns, disk->disk_name);
 269         disk->driverfs_dev = dev;
 270         set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset)
 271                         / 512);
 272         pmem->pmem_disk = disk;
 273         devm_exit_badblocks(dev, &pmem->bb);
 274         if (devm_init_badblocks(dev, &pmem->bb))
 275                 return -ENOMEM;
 276         bb_res.start = nsio->res.start + pmem->data_offset;
 277         bb_res.end = nsio->res.end;
 278         if (is_nd_pfn(dev)) {
 279                 struct nd_pfn *nd_pfn = to_nd_pfn(dev);
 280                 struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
 281
 282                 bb_res.start += __le32_to_cpu(pfn_sb->start_pad);
 283                 bb_res.end -= __le32_to_cpu(pfn_sb->end_trunc);
 284         }
 285         nvdimm_badblocks_populate(to_nd_region(dev->parent), &pmem->bb,
 286                         &bb_res);
 287         disk->bb = &pmem->bb;
 288         add_disk(disk);
 289         revalidate_disk(disk);
 290
 291         return 0;
 292 }
 293
 294 static int pmem_rw_bytes(struct nd_namespace_common *ndns,
 295                 resource_size_t offset, void *buf, size_t size, int rw)
 296 {
 297         struct pmem_device *pmem = dev_get_drvdata(ndns->claim);
 298
 299         if (unlikely(offset + size > pmem->size)) {
 300                 dev_WARN_ONCE(&ndns->dev, 1, "request out of range\n");
 301                 return -EFAULT;
 302         }
 303
 304         if (rw == READ) {
 305                 unsigned int sz_align = ALIGN(size + (offset & (512 - 1)), 512);
 306
 307                 if (unlikely(is_bad_pmem(&pmem->bb, offset / 512, sz_align)))
 308                         return -EIO;
 309                 return memcpy_from_pmem(buf, pmem->virt_addr + offset, size);
 310         } else {
 311                 memcpy_to_pmem(pmem->virt_addr + offset, buf, size);
 312                 wmb_pmem();
 313         }
 314
 315         return 0;
 316 }
 317
 318 static int nd_pfn_init(struct nd_pfn *nd_pfn)
 319 {
 320         struct nd_pfn_sb *pfn_sb = kzalloc(sizeof(*pfn_sb), GFP_KERNEL);
 321         struct pmem_device *pmem = dev_get_drvdata(&nd_pfn->dev);
 322         struct nd_namespace_common *ndns = nd_pfn->ndns;
 323         u32 start_pad = 0, end_trunc = 0;
 324         resource_size_t start, size;
 325         struct nd_namespace_io *nsio;
 326         struct nd_region *nd_region;
 327         unsigned long npfns;
 328         phys_addr_t offset;
 329         u64 checksum;
 330         int rc;
 331
 332         if (!pfn_sb)
 333                 return -ENOMEM;
 334
 335         nd_pfn->pfn_sb = pfn_sb;
 336         rc = nd_pfn_validate(nd_pfn);
 337         if (rc == -ENODEV)
 338                 /* no info block, do init */;
 339         else
 340                 return rc;
 341
 342         nd_region = to_nd_region(nd_pfn->dev.parent);
 343         if (nd_region->ro) {
 344                 dev_info(&nd_pfn->dev,
 345                                 "%s is read-only, unable to init metadata\n",
 346                                 dev_name(&nd_region->dev));
 347                 goto err;
 348         }
 349
 350         memset(pfn_sb, 0, sizeof(*pfn_sb));
 351
 352         /*
 353          * Check if pmem collides with 'System RAM' when section aligned and
 354          * trim it accordingly
 355          */
 356         nsio = to_nd_namespace_io(&ndns->dev);
 357         start = PHYS_SECTION_ALIGN_DOWN(nsio->res.start);
 358         size = resource_size(&nsio->res);
 359         if (region_intersects(start, size, IORESOURCE_SYSTEM_RAM,
 360                                 IORES_DESC_NONE) == REGION_MIXED) {
 361
 362                 start = nsio->res.start;
 363                 start_pad = PHYS_SECTION_ALIGN_UP(start) - start;
 364         }
 365
 366         start = nsio->res.start;
 367         size = PHYS_SECTION_ALIGN_UP(start + size) - start;
 368         if (region_intersects(start, size, IORESOURCE_SYSTEM_RAM,
 369                                 IORES_DESC_NONE) == REGION_MIXED) {
 370                 size = resource_size(&nsio->res);
 371                 end_trunc = start + size - PHYS_SECTION_ALIGN_DOWN(start + size);
 372         }
 373
 374         if (start_pad + end_trunc)
 375                 dev_info(&nd_pfn->dev, "%s section collision, truncate %d bytes\n",
 376                                 dev_name(&ndns->dev), start_pad + end_trunc);
 377
 378         /*
 379          * Note, we use 64 here for the standard size of struct page,
 380          * debugging options may cause it to be larger in which case the
 381          * implementation will limit the pfns advertised through
 382          * ->direct_access() to those that are included in the memmap.
 383          */
 384         start += start_pad;
 385         npfns = (pmem->size - start_pad - end_trunc - SZ_8K) / SZ_4K;
 386         if (nd_pfn->mode == PFN_MODE_PMEM)
 387                 offset = ALIGN(start + SZ_8K + 64 * npfns, nd_pfn->align)
 388                         - start;
 389         else if (nd_pfn->mode == PFN_MODE_RAM)
 390                 offset = ALIGN(start + SZ_8K, nd_pfn->align) - start;
 391         else
 392                 goto err;
 393
 394         if (offset + start_pad + end_trunc >= pmem->size) {
 395                 dev_err(&nd_pfn->dev, "%s unable to satisfy requested alignment\n",
 396                                 dev_name(&ndns->dev));
 397                 goto err;
 398         }
 399
 400         npfns = (pmem->size - offset - start_pad - end_trunc) / SZ_4K;
 401         pfn_sb->mode = cpu_to_le32(nd_pfn->mode);
 402         pfn_sb->dataoff = cpu_to_le64(offset);
 403         pfn_sb->npfns = cpu_to_le64(npfns);
 404         memcpy(pfn_sb->signature, PFN_SIG, PFN_SIG_LEN);
 405         memcpy(pfn_sb->uuid, nd_pfn->uuid, 16);
 406         memcpy(pfn_sb->parent_uuid, nd_dev_to_uuid(&ndns->dev), 16);
 407         pfn_sb->version_major = cpu_to_le16(1);
 408         pfn_sb->version_minor = cpu_to_le16(1);
 409         pfn_sb->start_pad = cpu_to_le32(start_pad);
 410         pfn_sb->end_trunc = cpu_to_le32(end_trunc);
 411         checksum = nd_sb_checksum((struct nd_gen_sb *) pfn_sb);
 412         pfn_sb->checksum = cpu_to_le64(checksum);
 413
 414         rc = nvdimm_write_bytes(ndns, SZ_4K, pfn_sb, sizeof(*pfn_sb));
 415         if (rc)
 416                 goto err;
 417
 418         return 0;
 419  err:
 420         nd_pfn->pfn_sb = NULL;
 421         kfree(pfn_sb);
 422         return -ENXIO;
 423 }
 424
 425 static int nvdimm_namespace_detach_pfn(struct nd_namespace_common *ndns)
 426 {
 427         struct nd_pfn *nd_pfn = to_nd_pfn(ndns->claim);
 428         struct pmem_device *pmem;
 429
 430         /* free pmem disk */
 431         pmem = dev_get_drvdata(&nd_pfn->dev);
 432         pmem_detach_disk(pmem);
 433
 434         /* release nd_pfn resources */
 435         kfree(nd_pfn->pfn_sb);
 436         nd_pfn->pfn_sb = NULL;
 437
 438         return 0;
 439 }
 440
 441 /*
 442  * We hotplug memory at section granularity, pad the reserved area from
 443  * the previous section base to the namespace base address.
 444  */
 445 static unsigned long init_altmap_base(resource_size_t base)
 446 {
 447         unsigned long base_pfn = PHYS_PFN(base);
 448
 449         return PFN_SECTION_ALIGN_DOWN(base_pfn);
 450 }
 451
 452 static unsigned long init_altmap_reserve(resource_size_t base)
 453 {
 454         unsigned long reserve = PHYS_PFN(SZ_8K);
 455         unsigned long base_pfn = PHYS_PFN(base);
 456
 457         reserve += base_pfn - PFN_SECTION_ALIGN_DOWN(base_pfn);
 458         return reserve;
 459 }
 460
 461 static int __nvdimm_namespace_attach_pfn(struct nd_pfn *nd_pfn)
 462 {
 463         int rc;
 464         struct resource res;
 465         struct request_queue *q;
 466         struct pmem_device *pmem;
 467         struct vmem_altmap *altmap;
 468         struct device *dev = &nd_pfn->dev;
 469         struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
 470         struct nd_namespace_common *ndns = nd_pfn->ndns;
 471         u32 start_pad = __le32_to_cpu(pfn_sb->start_pad);
 472         u32 end_trunc = __le32_to_cpu(pfn_sb->end_trunc);
 473         struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
 474         resource_size_t base = nsio->res.start + start_pad;
 475         struct vmem_altmap __altmap = {
 476                 .base_pfn = init_altmap_base(base),
 477                 .reserve = init_altmap_reserve(base),
 478         };
 479
 480         pmem = dev_get_drvdata(dev);
 481         pmem->data_offset = le64_to_cpu(pfn_sb->dataoff);
 482         pmem->pfn_pad = start_pad + end_trunc;
 483         nd_pfn->mode = le32_to_cpu(nd_pfn->pfn_sb->mode);
 484         if (nd_pfn->mode == PFN_MODE_RAM) {
 485                 if (pmem->data_offset < SZ_8K)
 486                         return -EINVAL;
 487                 nd_pfn->npfns = le64_to_cpu(pfn_sb->npfns);
 488                 altmap = NULL;
 489         } else if (nd_pfn->mode == PFN_MODE_PMEM) {
 490                 nd_pfn->npfns = (pmem->size - pmem->pfn_pad - pmem->data_offset)
 491                         / PAGE_SIZE;
 492                 if (le64_to_cpu(nd_pfn->pfn_sb->npfns) > nd_pfn->npfns)
 493                         dev_info(&nd_pfn->dev,
 494                                         "number of pfns truncated from %lld to %ld\n",
 495                                         le64_to_cpu(nd_pfn->pfn_sb->npfns),
 496                                         nd_pfn->npfns);
 497                 altmap = & __altmap;
 498                 altmap->free = PHYS_PFN(pmem->data_offset - SZ_8K);
 499                 altmap->alloc = 0;
 500         } else {
 501                 rc = -ENXIO;
 502                 goto err;
 503         }
 504
 505         /* establish pfn range for lookup, and switch to direct map */
 506         q = pmem->pmem_queue;
 507         memcpy(&res, &nsio->res, sizeof(res));
 508         res.start += start_pad;
 509         res.end -= end_trunc;
 510         devm_memunmap(dev, (void __force *) pmem->virt_addr);
 511         pmem->virt_addr = (void __pmem *) devm_memremap_pages(dev, &res,
 512                         &q->q_usage_counter, altmap);
 513         pmem->pfn_flags |= PFN_MAP;
 514         if (IS_ERR(pmem->virt_addr)) {
 515                 rc = PTR_ERR(pmem->virt_addr);
 516                 goto err;
 517         }
 518
 519         /* attach pmem disk in "pfn-mode" */
 520         rc = pmem_attach_disk(dev, ndns, pmem);
 521         if (rc)
 522                 goto err;
 523
 524         return rc;
 525  err:
 526         nvdimm_namespace_detach_pfn(ndns);
 527         return rc;
 528
 529 }
 530
 531 static int nvdimm_namespace_attach_pfn(struct nd_namespace_common *ndns)
 532 {
 533         struct nd_pfn *nd_pfn = to_nd_pfn(ndns->claim);
 534         int rc;
 535
 536         if (!nd_pfn->uuid || !nd_pfn->ndns)
 537                 return -ENODEV;
 538
 539         rc = nd_pfn_init(nd_pfn);
 540         if (rc)
 541                 return rc;
 542         /* we need a valid pfn_sb before we can init a vmem_altmap */
 543         return __nvdimm_namespace_attach_pfn(nd_pfn);
 544 }
 545
 546 static int nd_pmem_probe(struct device *dev)
 547 {
 548         struct nd_region *nd_region = to_nd_region(dev->parent);
 549         struct nd_namespace_common *ndns;
 550         struct nd_namespace_io *nsio;
 551         struct pmem_device *pmem;
 552
 553         ndns = nvdimm_namespace_common_probe(dev);
 554         if (IS_ERR(ndns))
 555                 return PTR_ERR(ndns);
 556
 557         nsio = to_nd_namespace_io(&ndns->dev);
 558         pmem = pmem_alloc(dev, &nsio->res, nd_region->id);
 559         if (IS_ERR(pmem))
 560                 return PTR_ERR(pmem);
 561
 562         pmem->ndns = ndns;
 563         dev_set_drvdata(dev, pmem);
 564         ndns->rw_bytes = pmem_rw_bytes;
 565         if (devm_init_badblocks(dev, &pmem->bb))
 566                 return -ENOMEM;
 567         nvdimm_badblocks_populate(nd_region, &pmem->bb, &nsio->res);
 568
 569         if (is_nd_btt(dev)) {
 570                 /* btt allocates its own request_queue */
 571                 blk_cleanup_queue(pmem->pmem_queue);
 572                 pmem->pmem_queue = NULL;
 573                 return nvdimm_namespace_attach_btt(ndns);
 574         }
 575
 576         if (is_nd_pfn(dev))
 577                 return nvdimm_namespace_attach_pfn(ndns);
 578
 579         if (nd_btt_probe(ndns, pmem) == 0 || nd_pfn_probe(ndns, pmem) == 0) {
 580                 /*
 581                  * We'll come back as either btt-pmem, or pfn-pmem, so
 582                  * drop the queue allocation for now.
 583                  */
 584                 blk_cleanup_queue(pmem->pmem_queue);
 585                 return -ENXIO;
 586         }
 587
 588         return pmem_attach_disk(dev, ndns, pmem);
 589 }
 590
 591 static int nd_pmem_remove(struct device *dev)
 592 {
 593         struct pmem_device *pmem = dev_get_drvdata(dev);
 594
 595         if (is_nd_btt(dev))
 596                 nvdimm_namespace_detach_btt(pmem->ndns);
 597         else if (is_nd_pfn(dev))
 598                 nvdimm_namespace_detach_pfn(pmem->ndns);
 599         else
 600                 pmem_detach_disk(pmem);
 601
 602         return 0;
 603 }
 604
 605 static void nd_pmem_notify(struct device *dev, enum nvdimm_event event)
 606 {
 607         struct pmem_device *pmem = dev_get_drvdata(dev);
 608         struct nd_namespace_common *ndns = pmem->ndns;
 609         struct nd_region *nd_region = to_nd_region(dev->parent);
 610         struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
 611         struct resource res = {
 612                 .start = nsio->res.start + pmem->data_offset,
 613                 .end = nsio->res.end,
 614         };
 615
 616         if (event != NVDIMM_REVALIDATE_POISON)
 617                 return;
 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                 res.start += __le32_to_cpu(pfn_sb->start_pad);
 624                 res.end -= __le32_to_cpu(pfn_sb->end_trunc);
 625         }
 626
 627         nvdimm_badblocks_populate(nd_region, &pmem->bb, &res);
 628 }
 629
 630 MODULE_ALIAS("pmem");
 631 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_IO);
 632 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_PMEM);
 633 static struct nd_device_driver nd_pmem_driver = {
 634         .probe = nd_pmem_probe,
 635         .remove = nd_pmem_remove,
 636         .notify = nd_pmem_notify,
 637         .drv = {
 638                 .name = "nd_pmem",
 639         },
 640         .type = ND_DRIVER_NAMESPACE_IO | ND_DRIVER_NAMESPACE_PMEM,
 641 };
 642
 643 static int __init pmem_init(void)
 644 {
 645         return nd_driver_register(&nd_pmem_driver);
 646 }
 647 module_init(pmem_init);
 648
 649 static void pmem_exit(void)
 650 {
 651         driver_unregister(&nd_pmem_driver.drv);
 652 }
 653 module_exit(pmem_exit);
 654
 655 MODULE_AUTHOR("Ross Zwisler <ross.zwisler@linux.intel.com>");
 656 MODULE_LICENSE("GPL v2");