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/kstrtox.h> 21#include <linux/vmalloc.h> 22#include <linux/blk-mq.h> 23#include <linux/pfn_t.h> 24#include <linux/slab.h> 25#include <linux/uio.h> 26#include <linux/dax.h> 27#include <linux/nd.h> 28#include <linux/mm.h> 29#include <asm/cacheflush.h> 30#include "pmem.h" 31#include "btt.h" 32#include "pfn.h" 33#include "nd.h" 34 35static struct device *to_dev(struct pmem_device *pmem) 36{ 37 /* 38 * nvdimm bus services need a 'dev' parameter, and we record the device 39 * at init in bb.dev. 40 */ 41 return pmem->bb.dev; 42} 43 44static struct nd_region *to_region(struct pmem_device *pmem) 45{ 46 return to_nd_region(to_dev(pmem)->parent); 47} 48 49static phys_addr_t pmem_to_phys(struct pmem_device *pmem, phys_addr_t offset) 50{ 51 return pmem->phys_addr + offset; 52} 53 54static sector_t to_sect(struct pmem_device *pmem, phys_addr_t offset) 55{ 56 return (offset - pmem->data_offset) >> SECTOR_SHIFT; 57} 58 59static phys_addr_t to_offset(struct pmem_device *pmem, sector_t sector) 60{ 61 return (sector << SECTOR_SHIFT) + pmem->data_offset; 62} 63 64static void pmem_mkpage_present(struct pmem_device *pmem, phys_addr_t offset, 65 unsigned int len) 66{ 67 phys_addr_t phys = pmem_to_phys(pmem, offset); 68 unsigned long pfn_start, pfn_end, pfn; 69 70 /* only pmem in the linear map supports HWPoison */ 71 if (is_vmalloc_addr(pmem->virt_addr)) 72 return; 73 74 pfn_start = PHYS_PFN(phys); 75 pfn_end = pfn_start + PHYS_PFN(len); 76 for (pfn = pfn_start; pfn < pfn_end; pfn++) { 77 struct page *page = pfn_to_page(pfn); 78 79 /* 80 * Note, no need to hold a get_dev_pagemap() reference 81 * here since we're in the driver I/O path and 82 * outstanding I/O requests pin the dev_pagemap. 83 */ 84 if (test_and_clear_pmem_poison(page)) 85 clear_mce_nospec(pfn); 86 } 87} 88 89static void pmem_clear_bb(struct pmem_device *pmem, sector_t sector, long blks) 90{ 91 if (blks == 0) 92 return; 93 badblocks_clear(&pmem->bb, sector, blks); 94 if (pmem->bb_state) 95 sysfs_notify_dirent(pmem->bb_state); 96} 97 98static long __pmem_clear_poison(struct pmem_device *pmem, 99 phys_addr_t offset, unsigned int len) 100{ 101 phys_addr_t phys = pmem_to_phys(pmem, offset); 102 long cleared = nvdimm_clear_poison(to_dev(pmem), phys, len); 103 104 if (cleared > 0) { 105 pmem_mkpage_present(pmem, offset, cleared); 106 arch_invalidate_pmem(pmem->virt_addr + offset, len); 107 } 108 return cleared; 109} 110 111static blk_status_t pmem_clear_poison(struct pmem_device *pmem, 112 phys_addr_t offset, unsigned int len) 113{ 114 long cleared = __pmem_clear_poison(pmem, offset, len); 115 116 if (cleared < 0) 117 return BLK_STS_IOERR; 118 119 pmem_clear_bb(pmem, to_sect(pmem, offset), cleared >> SECTOR_SHIFT); 120 if (cleared < len) 121 return BLK_STS_IOERR; 122 return BLK_STS_OK; 123} 124 125static void write_pmem(void *pmem_addr, struct page *page, 126 unsigned int off, unsigned int len) 127{ 128 unsigned int chunk; 129 void *mem; 130 131 while (len) { 132 mem = kmap_atomic(page); 133 chunk = min_t(unsigned int, len, PAGE_SIZE - off); 134 memcpy_flushcache(pmem_addr, mem + off, chunk); 135 kunmap_atomic(mem); 136 len -= chunk; 137 off = 0; 138 page++; 139 pmem_addr += chunk; 140 } 141} 142 143static blk_status_t read_pmem(struct page *page, unsigned int off, 144 void *pmem_addr, unsigned int len) 145{ 146 unsigned int chunk; 147 unsigned long rem; 148 void *mem; 149 150 while (len) { 151 mem = kmap_atomic(page); 152 chunk = min_t(unsigned int, len, PAGE_SIZE - off); 153 rem = copy_mc_to_kernel(mem + off, pmem_addr, chunk); 154 kunmap_atomic(mem); 155 if (rem) 156 return BLK_STS_IOERR; 157 len -= chunk; 158 off = 0; 159 page++; 160 pmem_addr += chunk; 161 } 162 return BLK_STS_OK; 163} 164 165static blk_status_t pmem_do_read(struct pmem_device *pmem, 166 struct page *page, unsigned int page_off, 167 sector_t sector, unsigned int len) 168{ 169 blk_status_t rc; 170 phys_addr_t pmem_off = to_offset(pmem, sector); 171 void *pmem_addr = pmem->virt_addr + pmem_off; 172 173 if (unlikely(is_bad_pmem(&pmem->bb, sector, len))) 174 return BLK_STS_IOERR; 175 176 rc = read_pmem(page, page_off, pmem_addr, len); 177 flush_dcache_page(page); 178 return rc; 179} 180 181static blk_status_t pmem_do_write(struct pmem_device *pmem, 182 struct page *page, unsigned int page_off, 183 sector_t sector, unsigned int len) 184{ 185 phys_addr_t pmem_off = to_offset(pmem, sector); 186 void *pmem_addr = pmem->virt_addr + pmem_off; 187 188 if (unlikely(is_bad_pmem(&pmem->bb, sector, len))) { 189 blk_status_t rc = pmem_clear_poison(pmem, pmem_off, len); 190 191 if (rc != BLK_STS_OK) 192 return rc; 193 } 194 195 flush_dcache_page(page); 196 write_pmem(pmem_addr, page, page_off, len); 197 198 return BLK_STS_OK; 199} 200 201static void pmem_submit_bio(struct bio *bio) 202{ 203 int ret = 0; 204 blk_status_t rc = 0; 205 bool do_acct; 206 unsigned long start; 207 struct bio_vec bvec; 208 struct bvec_iter iter; 209 struct pmem_device *pmem = bio->bi_bdev->bd_disk->private_data; 210 struct nd_region *nd_region = to_region(pmem); 211 212 if (bio->bi_opf & REQ_PREFLUSH) 213 ret = nvdimm_flush(nd_region, bio); 214 215 do_acct = blk_queue_io_stat(bio->bi_bdev->bd_disk->queue); 216 if (do_acct) 217 start = bio_start_io_acct(bio); 218 bio_for_each_segment(bvec, bio, iter) { 219 if (op_is_write(bio_op(bio))) 220 rc = pmem_do_write(pmem, bvec.bv_page, bvec.bv_offset, 221 iter.bi_sector, bvec.bv_len); 222 else 223 rc = pmem_do_read(pmem, bvec.bv_page, bvec.bv_offset, 224 iter.bi_sector, bvec.bv_len); 225 if (rc) { 226 bio->bi_status = rc; 227 break; 228 } 229 } 230 if (do_acct) 231 bio_end_io_acct(bio, start); 232 233 if (bio->bi_opf & REQ_FUA) 234 ret = nvdimm_flush(nd_region, bio); 235 236 if (ret) 237 bio->bi_status = errno_to_blk_status(ret); 238 239 bio_endio(bio); 240} 241 242/* see "strong" declaration in tools/testing/nvdimm/pmem-dax.c */ 243__weak long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff, 244 long nr_pages, enum dax_access_mode mode, void **kaddr, 245 pfn_t *pfn) 246{ 247 resource_size_t offset = PFN_PHYS(pgoff) + pmem->data_offset; 248 sector_t sector = PFN_PHYS(pgoff) >> SECTOR_SHIFT; 249 unsigned int num = PFN_PHYS(nr_pages) >> SECTOR_SHIFT; 250 struct badblocks *bb = &pmem->bb; 251 sector_t first_bad; 252 int num_bad; 253 254 if (kaddr) 255 *kaddr = pmem->virt_addr + offset; 256 if (pfn) 257 *pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags); 258 259 if (bb->count && 260 badblocks_check(bb, sector, num, &first_bad, &num_bad)) { 261 long actual_nr; 262 263 if (mode != DAX_RECOVERY_WRITE) 264 return -EHWPOISON; 265 266 /* 267 * Set the recovery stride is set to kernel page size because 268 * the underlying driver and firmware clear poison functions 269 * don't appear to handle large chunk(such as 2MiB) reliably. 270 */ 271 actual_nr = PHYS_PFN( 272 PAGE_ALIGN((first_bad - sector) << SECTOR_SHIFT)); 273 dev_dbg(pmem->bb.dev, "start sector(%llu), nr_pages(%ld), first_bad(%llu), actual_nr(%ld)\n", 274 sector, nr_pages, first_bad, actual_nr); 275 if (actual_nr) 276 return actual_nr; 277 return 1; 278 } 279 280 /* 281 * If badblocks are present but not in the range, limit known good range 282 * to the requested range. 283 */ 284 if (bb->count) 285 return nr_pages; 286 return PHYS_PFN(pmem->size - pmem->pfn_pad - offset); 287} 288 289static const struct block_device_operations pmem_fops = { 290 .owner = THIS_MODULE, 291 .submit_bio = pmem_submit_bio, 292}; 293 294static int pmem_dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff, 295 size_t nr_pages) 296{ 297 struct pmem_device *pmem = dax_get_private(dax_dev); 298 299 return blk_status_to_errno(pmem_do_write(pmem, ZERO_PAGE(0), 0, 300 PFN_PHYS(pgoff) >> SECTOR_SHIFT, 301 PAGE_SIZE)); 302} 303 304static long pmem_dax_direct_access(struct dax_device *dax_dev, 305 pgoff_t pgoff, long nr_pages, enum dax_access_mode mode, 306 void **kaddr, pfn_t *pfn) 307{ 308 struct pmem_device *pmem = dax_get_private(dax_dev); 309 310 return __pmem_direct_access(pmem, pgoff, nr_pages, mode, kaddr, pfn); 311} 312 313/* 314 * The recovery write thread started out as a normal pwrite thread and 315 * when the filesystem was told about potential media error in the 316 * range, filesystem turns the normal pwrite to a dax_recovery_write. 317 * 318 * The recovery write consists of clearing media poison, clearing page 319 * HWPoison bit, reenable page-wide read-write permission, flush the 320 * caches and finally write. A competing pread thread will be held 321 * off during the recovery process since data read back might not be 322 * valid, and this is achieved by clearing the badblock records after 323 * the recovery write is complete. Competing recovery write threads 324 * are already serialized by writer lock held by dax_iomap_rw(). 325 */ 326static size_t pmem_recovery_write(struct dax_device *dax_dev, pgoff_t pgoff, 327 void *addr, size_t bytes, struct iov_iter *i) 328{ 329 struct pmem_device *pmem = dax_get_private(dax_dev); 330 size_t olen, len, off; 331 phys_addr_t pmem_off; 332 struct device *dev = pmem->bb.dev; 333 long cleared; 334 335 off = offset_in_page(addr); 336 len = PFN_PHYS(PFN_UP(off + bytes)); 337 if (!is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) >> SECTOR_SHIFT, len)) 338 return _copy_from_iter_flushcache(addr, bytes, i); 339 340 /* 341 * Not page-aligned range cannot be recovered. This should not 342 * happen unless something else went wrong. 343 */ 344 if (off || !PAGE_ALIGNED(bytes)) { 345 dev_dbg(dev, "Found poison, but addr(%p) or bytes(%#zx) not page aligned\n", 346 addr, bytes); 347 return 0; 348 } 349 350 pmem_off = PFN_PHYS(pgoff) + pmem->data_offset; 351 cleared = __pmem_clear_poison(pmem, pmem_off, len); 352 if (cleared > 0 && cleared < len) { 353 dev_dbg(dev, "poison cleared only %ld out of %zu bytes\n", 354 cleared, len); 355 return 0; 356 } 357 if (cleared < 0) { 358 dev_dbg(dev, "poison clear failed: %ld\n", cleared); 359 return 0; 360 } 361 362 olen = _copy_from_iter_flushcache(addr, bytes, i); 363 pmem_clear_bb(pmem, to_sect(pmem, pmem_off), cleared >> SECTOR_SHIFT); 364 365 return olen; 366} 367 368static const struct dax_operations pmem_dax_ops = { 369 .direct_access = pmem_dax_direct_access, 370 .zero_page_range = pmem_dax_zero_page_range, 371 .recovery_write = pmem_recovery_write, 372}; 373 374static ssize_t write_cache_show(struct device *dev, 375 struct device_attribute *attr, char *buf) 376{ 377 struct pmem_device *pmem = dev_to_disk(dev)->private_data; 378 379 return sprintf(buf, "%d\n", !!dax_write_cache_enabled(pmem->dax_dev)); 380} 381 382static ssize_t write_cache_store(struct device *dev, 383 struct device_attribute *attr, const char *buf, size_t len) 384{ 385 struct pmem_device *pmem = dev_to_disk(dev)->private_data; 386 bool write_cache; 387 int rc; 388 389 rc = kstrtobool(buf, &write_cache); 390 if (rc) 391 return rc; 392 dax_write_cache(pmem->dax_dev, write_cache); 393 return len; 394} 395static DEVICE_ATTR_RW(write_cache); 396 397static umode_t dax_visible(struct kobject *kobj, struct attribute *a, int n) 398{ 399#ifndef CONFIG_ARCH_HAS_PMEM_API 400 if (a == &dev_attr_write_cache.attr) 401 return 0; 402#endif 403 return a->mode; 404} 405 406static struct attribute *dax_attributes[] = { 407 &dev_attr_write_cache.attr, 408 NULL, 409}; 410 411static const struct attribute_group dax_attribute_group = { 412 .name = "dax", 413 .attrs = dax_attributes, 414 .is_visible = dax_visible, 415}; 416 417static const struct attribute_group *pmem_attribute_groups[] = { 418 &dax_attribute_group, 419 NULL, 420}; 421 422static void pmem_release_disk(void *__pmem) 423{ 424 struct pmem_device *pmem = __pmem; 425 426 dax_remove_host(pmem->disk); 427 kill_dax(pmem->dax_dev); 428 put_dax(pmem->dax_dev); 429 del_gendisk(pmem->disk); 430 431 put_disk(pmem->disk); 432} 433 434static int pmem_pagemap_memory_failure(struct dev_pagemap *pgmap, 435 unsigned long pfn, unsigned long nr_pages, int mf_flags) 436{ 437 struct pmem_device *pmem = 438 container_of(pgmap, struct pmem_device, pgmap); 439 u64 offset = PFN_PHYS(pfn) - pmem->phys_addr - pmem->data_offset; 440 u64 len = nr_pages << PAGE_SHIFT; 441 442 return dax_holder_notify_failure(pmem->dax_dev, offset, len, mf_flags); 443} 444 445static const struct dev_pagemap_ops fsdax_pagemap_ops = { 446 .memory_failure = pmem_pagemap_memory_failure, 447}; 448 449static int pmem_attach_disk(struct device *dev, 450 struct nd_namespace_common *ndns) 451{ 452 struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev); 453 struct nd_region *nd_region = to_nd_region(dev->parent); 454 struct queue_limits lim = { 455 .logical_block_size = pmem_sector_size(ndns), 456 .physical_block_size = PAGE_SIZE, 457 .max_hw_sectors = UINT_MAX, 458 }; 459 int nid = dev_to_node(dev), fua; 460 struct resource *res = &nsio->res; 461 struct range bb_range; 462 struct nd_pfn *nd_pfn = NULL; 463 struct dax_device *dax_dev; 464 struct nd_pfn_sb *pfn_sb; 465 struct pmem_device *pmem; 466 struct request_queue *q; 467 struct gendisk *disk; 468 void *addr; 469 int rc; 470 471 pmem = devm_kzalloc(dev, sizeof(*pmem), GFP_KERNEL); 472 if (!pmem) 473 return -ENOMEM; 474 475 rc = devm_namespace_enable(dev, ndns, nd_info_block_reserve()); 476 if (rc) 477 return rc; 478 479 /* while nsio_rw_bytes is active, parse a pfn info block if present */ 480 if (is_nd_pfn(dev)) { 481 nd_pfn = to_nd_pfn(dev); 482 rc = nvdimm_setup_pfn(nd_pfn, &pmem->pgmap); 483 if (rc) 484 return rc; 485 } 486 487 /* we're attaching a block device, disable raw namespace access */ 488 devm_namespace_disable(dev, ndns); 489 490 dev_set_drvdata(dev, pmem); 491 pmem->phys_addr = res->start; 492 pmem->size = resource_size(res); 493 fua = nvdimm_has_flush(nd_region); 494 if (!IS_ENABLED(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) || fua < 0) { 495 dev_warn(dev, "unable to guarantee persistence of writes\n"); 496 fua = 0; 497 } 498 499 if (!devm_request_mem_region(dev, res->start, resource_size(res), 500 dev_name(&ndns->dev))) { 501 dev_warn(dev, "could not reserve region %pR\n", res); 502 return -EBUSY; 503 } 504 505 disk = blk_alloc_disk(&lim, nid); 506 if (IS_ERR(disk)) 507 return PTR_ERR(disk); 508 q = disk->queue; 509 510 pmem->disk = disk; 511 pmem->pgmap.owner = pmem; 512 pmem->pfn_flags = PFN_DEV; 513 if (is_nd_pfn(dev)) { 514 pmem->pgmap.type = MEMORY_DEVICE_FS_DAX; 515 pmem->pgmap.ops = &fsdax_pagemap_ops; 516 addr = devm_memremap_pages(dev, &pmem->pgmap); 517 pfn_sb = nd_pfn->pfn_sb; 518 pmem->data_offset = le64_to_cpu(pfn_sb->dataoff); 519 pmem->pfn_pad = resource_size(res) - 520 range_len(&pmem->pgmap.range); 521 pmem->pfn_flags |= PFN_MAP; 522 bb_range = pmem->pgmap.range; 523 bb_range.start += pmem->data_offset; 524 } else if (pmem_should_map_pages(dev)) { 525 pmem->pgmap.range.start = res->start; 526 pmem->pgmap.range.end = res->end; 527 pmem->pgmap.nr_range = 1; 528 pmem->pgmap.type = MEMORY_DEVICE_FS_DAX; 529 pmem->pgmap.ops = &fsdax_pagemap_ops; 530 addr = devm_memremap_pages(dev, &pmem->pgmap); 531 pmem->pfn_flags |= PFN_MAP; 532 bb_range = pmem->pgmap.range; 533 } else { 534 addr = devm_memremap(dev, pmem->phys_addr, 535 pmem->size, ARCH_MEMREMAP_PMEM); 536 bb_range.start = res->start; 537 bb_range.end = res->end; 538 } 539 540 if (IS_ERR(addr)) { 541 rc = PTR_ERR(addr); 542 goto out; 543 } 544 pmem->virt_addr = addr; 545 546 blk_queue_write_cache(q, true, fua); 547 blk_queue_flag_set(QUEUE_FLAG_NONROT, q); 548 blk_queue_flag_set(QUEUE_FLAG_SYNCHRONOUS, q); 549 if (pmem->pfn_flags & PFN_MAP) 550 blk_queue_flag_set(QUEUE_FLAG_DAX, q); 551 552 disk->fops = &pmem_fops; 553 disk->private_data = pmem; 554 nvdimm_namespace_disk_name(ndns, disk->disk_name); 555 set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset) 556 / 512); 557 if (devm_init_badblocks(dev, &pmem->bb)) 558 return -ENOMEM; 559 nvdimm_badblocks_populate(nd_region, &pmem->bb, &bb_range); 560 disk->bb = &pmem->bb; 561 562 dax_dev = alloc_dax(pmem, &pmem_dax_ops); 563 if (IS_ERR(dax_dev)) { 564 rc = PTR_ERR(dax_dev); 565 if (rc != -EOPNOTSUPP) 566 goto out; 567 } else { 568 set_dax_nocache(dax_dev); 569 set_dax_nomc(dax_dev); 570 if (is_nvdimm_sync(nd_region)) 571 set_dax_synchronous(dax_dev); 572 pmem->dax_dev = dax_dev; 573 rc = dax_add_host(dax_dev, disk); 574 if (rc) 575 goto out_cleanup_dax; 576 dax_write_cache(dax_dev, nvdimm_has_cache(nd_region)); 577 } 578 rc = device_add_disk(dev, disk, pmem_attribute_groups); 579 if (rc) 580 goto out_remove_host; 581 if (devm_add_action_or_reset(dev, pmem_release_disk, pmem)) 582 return -ENOMEM; 583 584 nvdimm_check_and_set_ro(disk); 585 586 pmem->bb_state = sysfs_get_dirent(disk_to_dev(disk)->kobj.sd, 587 "badblocks"); 588 if (!pmem->bb_state) 589 dev_warn(dev, "'badblocks' notification disabled\n"); 590 return 0; 591 592out_remove_host: 593 dax_remove_host(pmem->disk); 594out_cleanup_dax: 595 kill_dax(pmem->dax_dev); 596 put_dax(pmem->dax_dev); 597out: 598 put_disk(pmem->disk); 599 return rc; 600} 601 602static int nd_pmem_probe(struct device *dev) 603{ 604 int ret; 605 struct nd_namespace_common *ndns; 606 607 ndns = nvdimm_namespace_common_probe(dev); 608 if (IS_ERR(ndns)) 609 return PTR_ERR(ndns); 610 611 if (is_nd_btt(dev)) 612 return nvdimm_namespace_attach_btt(ndns); 613 614 if (is_nd_pfn(dev)) 615 return pmem_attach_disk(dev, ndns); 616 617 ret = devm_namespace_enable(dev, ndns, nd_info_block_reserve()); 618 if (ret) 619 return ret; 620 621 ret = nd_btt_probe(dev, ndns); 622 if (ret == 0) 623 return -ENXIO; 624 625 /* 626 * We have two failure conditions here, there is no 627 * info reserver block or we found a valid info reserve block 628 * but failed to initialize the pfn superblock. 629 * 630 * For the first case consider namespace as a raw pmem namespace 631 * and attach a disk. 632 * 633 * For the latter, consider this a success and advance the namespace 634 * seed. 635 */ 636 ret = nd_pfn_probe(dev, ndns); 637 if (ret == 0) 638 return -ENXIO; 639 else if (ret == -EOPNOTSUPP) 640 return ret; 641 642 ret = nd_dax_probe(dev, ndns); 643 if (ret == 0) 644 return -ENXIO; 645 else if (ret == -EOPNOTSUPP) 646 return ret; 647 648 /* probe complete, attach handles namespace enabling */ 649 devm_namespace_disable(dev, ndns); 650 651 return pmem_attach_disk(dev, ndns); 652} 653 654static void nd_pmem_remove(struct device *dev) 655{ 656 struct pmem_device *pmem = dev_get_drvdata(dev); 657 658 if (is_nd_btt(dev)) 659 nvdimm_namespace_detach_btt(to_nd_btt(dev)); 660 else { 661 /* 662 * Note, this assumes device_lock() context to not 663 * race nd_pmem_notify() 664 */ 665 sysfs_put(pmem->bb_state); 666 pmem->bb_state = NULL; 667 } 668 nvdimm_flush(to_nd_region(dev->parent), NULL); 669} 670 671static void nd_pmem_shutdown(struct device *dev) 672{ 673 nvdimm_flush(to_nd_region(dev->parent), NULL); 674} 675 676static void pmem_revalidate_poison(struct device *dev) 677{ 678 struct nd_region *nd_region; 679 resource_size_t offset = 0, end_trunc = 0; 680 struct nd_namespace_common *ndns; 681 struct nd_namespace_io *nsio; 682 struct badblocks *bb; 683 struct range range; 684 struct kernfs_node *bb_state; 685 686 if (is_nd_btt(dev)) { 687 struct nd_btt *nd_btt = to_nd_btt(dev); 688 689 ndns = nd_btt->ndns; 690 nd_region = to_nd_region(ndns->dev.parent); 691 nsio = to_nd_namespace_io(&ndns->dev); 692 bb = &nsio->bb; 693 bb_state = NULL; 694 } else { 695 struct pmem_device *pmem = dev_get_drvdata(dev); 696 697 nd_region = to_region(pmem); 698 bb = &pmem->bb; 699 bb_state = pmem->bb_state; 700 701 if (is_nd_pfn(dev)) { 702 struct nd_pfn *nd_pfn = to_nd_pfn(dev); 703 struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb; 704 705 ndns = nd_pfn->ndns; 706 offset = pmem->data_offset + 707 __le32_to_cpu(pfn_sb->start_pad); 708 end_trunc = __le32_to_cpu(pfn_sb->end_trunc); 709 } else { 710 ndns = to_ndns(dev); 711 } 712 713 nsio = to_nd_namespace_io(&ndns->dev); 714 } 715 716 range.start = nsio->res.start + offset; 717 range.end = nsio->res.end - end_trunc; 718 nvdimm_badblocks_populate(nd_region, bb, &range); 719 if (bb_state) 720 sysfs_notify_dirent(bb_state); 721} 722 723static void pmem_revalidate_region(struct device *dev) 724{ 725 struct pmem_device *pmem; 726 727 if (is_nd_btt(dev)) { 728 struct nd_btt *nd_btt = to_nd_btt(dev); 729 struct btt *btt = nd_btt->btt; 730 731 nvdimm_check_and_set_ro(btt->btt_disk); 732 return; 733 } 734 735 pmem = dev_get_drvdata(dev); 736 nvdimm_check_and_set_ro(pmem->disk); 737} 738 739static void nd_pmem_notify(struct device *dev, enum nvdimm_event event) 740{ 741 switch (event) { 742 case NVDIMM_REVALIDATE_POISON: 743 pmem_revalidate_poison(dev); 744 break; 745 case NVDIMM_REVALIDATE_REGION: 746 pmem_revalidate_region(dev); 747 break; 748 default: 749 dev_WARN_ONCE(dev, 1, "notify: unknown event: %d\n", event); 750 break; 751 } 752} 753 754MODULE_ALIAS("pmem"); 755MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_IO); 756MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_PMEM); 757static struct nd_device_driver nd_pmem_driver = { 758 .probe = nd_pmem_probe, 759 .remove = nd_pmem_remove, 760 .notify = nd_pmem_notify, 761 .shutdown = nd_pmem_shutdown, 762 .drv = { 763 .name = "nd_pmem", 764 }, 765 .type = ND_DRIVER_NAMESPACE_IO | ND_DRIVER_NAMESPACE_PMEM, 766}; 767 768module_nd_driver(nd_pmem_driver); 769 770MODULE_AUTHOR("Ross Zwisler <ross.zwisler@linux.intel.com>"); 771MODULE_LICENSE("GPL v2"); 772