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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 int nid = dev_to_node(dev), fua;
455 struct resource *res = &nsio->res;
456 struct range bb_range;
457 struct nd_pfn *nd_pfn = NULL;
458 struct dax_device *dax_dev;
459 struct nd_pfn_sb *pfn_sb;
460 struct pmem_device *pmem;
461 struct request_queue *q;
462 struct gendisk *disk;
463 void *addr;
464 int rc;
465
466 pmem = devm_kzalloc(dev, sizeof(*pmem), GFP_KERNEL);
467 if (!pmem)
468 return -ENOMEM;
469
470 rc = devm_namespace_enable(dev, ndns, nd_info_block_reserve());
471 if (rc)
472 return rc;
473
474 /* while nsio_rw_bytes is active, parse a pfn info block if present */
475 if (is_nd_pfn(dev)) {
476 nd_pfn = to_nd_pfn(dev);
477 rc = nvdimm_setup_pfn(nd_pfn, &pmem->pgmap);
478 if (rc)
479 return rc;
480 }
481
482 /* we're attaching a block device, disable raw namespace access */
483 devm_namespace_disable(dev, ndns);
484
485 dev_set_drvdata(dev, pmem);
486 pmem->phys_addr = res->start;
487 pmem->size = resource_size(res);
488 fua = nvdimm_has_flush(nd_region);
489 if (!IS_ENABLED(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) || fua < 0) {
490 dev_warn(dev, "unable to guarantee persistence of writes\n");
491 fua = 0;
492 }
493
494 if (!devm_request_mem_region(dev, res->start, resource_size(res),
495 dev_name(&ndns->dev))) {
496 dev_warn(dev, "could not reserve region %pR\n", res);
497 return -EBUSY;
498 }
499
500 disk = blk_alloc_disk(nid);
501 if (!disk)
502 return -ENOMEM;
503 q = disk->queue;
504
505 pmem->disk = disk;
506 pmem->pgmap.owner = pmem;
507 pmem->pfn_flags = PFN_DEV;
508 if (is_nd_pfn(dev)) {
509 pmem->pgmap.type = MEMORY_DEVICE_FS_DAX;
510 pmem->pgmap.ops = &fsdax_pagemap_ops;
511 addr = devm_memremap_pages(dev, &pmem->pgmap);
512 pfn_sb = nd_pfn->pfn_sb;
513 pmem->data_offset = le64_to_cpu(pfn_sb->dataoff);
514 pmem->pfn_pad = resource_size(res) -
515 range_len(&pmem->pgmap.range);
516 pmem->pfn_flags |= PFN_MAP;
517 bb_range = pmem->pgmap.range;
518 bb_range.start += pmem->data_offset;
519 } else if (pmem_should_map_pages(dev)) {
520 pmem->pgmap.range.start = res->start;
521 pmem->pgmap.range.end = res->end;
522 pmem->pgmap.nr_range = 1;
523 pmem->pgmap.type = MEMORY_DEVICE_FS_DAX;
524 pmem->pgmap.ops = &fsdax_pagemap_ops;
525 addr = devm_memremap_pages(dev, &pmem->pgmap);
526 pmem->pfn_flags |= PFN_MAP;
527 bb_range = pmem->pgmap.range;
528 } else {
529 addr = devm_memremap(dev, pmem->phys_addr,
530 pmem->size, ARCH_MEMREMAP_PMEM);
531 bb_range.start = res->start;
532 bb_range.end = res->end;
533 }
534
535 if (IS_ERR(addr)) {
536 rc = PTR_ERR(addr);
537 goto out;
538 }
539 pmem->virt_addr = addr;
540
541 blk_queue_write_cache(q, true, fua);
542 blk_queue_physical_block_size(q, PAGE_SIZE);
543 blk_queue_logical_block_size(q, pmem_sector_size(ndns));
544 blk_queue_max_hw_sectors(q, UINT_MAX);
545 blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
546 blk_queue_flag_set(QUEUE_FLAG_SYNCHRONOUS, q);
547 if (pmem->pfn_flags & PFN_MAP)
548 blk_queue_flag_set(QUEUE_FLAG_DAX, q);
549
550 disk->fops = &pmem_fops;
551 disk->private_data = pmem;
552 nvdimm_namespace_disk_name(ndns, disk->disk_name);
553 set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset)
554 / 512);
555 if (devm_init_badblocks(dev, &pmem->bb))
556 return -ENOMEM;
557 nvdimm_badblocks_populate(nd_region, &pmem->bb, &bb_range);
558 disk->bb = &pmem->bb;
559
560 dax_dev = alloc_dax(pmem, &pmem_dax_ops);
561 if (IS_ERR(dax_dev)) {
562 rc = PTR_ERR(dax_dev);
563 goto out;
564 }
565 set_dax_nocache(dax_dev);
566 set_dax_nomc(dax_dev);
567 if (is_nvdimm_sync(nd_region))
568 set_dax_synchronous(dax_dev);
569 rc = dax_add_host(dax_dev, disk);
570 if (rc)
571 goto out_cleanup_dax;
572 dax_write_cache(dax_dev, nvdimm_has_cache(nd_region));
573 pmem->dax_dev = dax_dev;
574
575 rc = device_add_disk(dev, disk, pmem_attribute_groups);
576 if (rc)
577 goto out_remove_host;
578 if (devm_add_action_or_reset(dev, pmem_release_disk, pmem))
579 return -ENOMEM;
580
581 nvdimm_check_and_set_ro(disk);
582
583 pmem->bb_state = sysfs_get_dirent(disk_to_dev(disk)->kobj.sd,
584 "badblocks");
585 if (!pmem->bb_state)
586 dev_warn(dev, "'badblocks' notification disabled\n");
587 return 0;
588
589out_remove_host:
590 dax_remove_host(pmem->disk);
591out_cleanup_dax:
592 kill_dax(pmem->dax_dev);
593 put_dax(pmem->dax_dev);
594out:
595 put_disk(pmem->disk);
596 return rc;
597}
598
599static int nd_pmem_probe(struct device *dev)
600{
601 int ret;
602 struct nd_namespace_common *ndns;
603
604 ndns = nvdimm_namespace_common_probe(dev);
605 if (IS_ERR(ndns))
606 return PTR_ERR(ndns);
607
608 if (is_nd_btt(dev))
609 return nvdimm_namespace_attach_btt(ndns);
610
611 if (is_nd_pfn(dev))
612 return pmem_attach_disk(dev, ndns);
613
614 ret = devm_namespace_enable(dev, ndns, nd_info_block_reserve());
615 if (ret)
616 return ret;
617
618 ret = nd_btt_probe(dev, ndns);
619 if (ret == 0)
620 return -ENXIO;
621
622 /*
623 * We have two failure conditions here, there is no
624 * info reserver block or we found a valid info reserve block
625 * but failed to initialize the pfn superblock.
626 *
627 * For the first case consider namespace as a raw pmem namespace
628 * and attach a disk.
629 *
630 * For the latter, consider this a success and advance the namespace
631 * seed.
632 */
633 ret = nd_pfn_probe(dev, ndns);
634 if (ret == 0)
635 return -ENXIO;
636 else if (ret == -EOPNOTSUPP)
637 return ret;
638
639 ret = nd_dax_probe(dev, ndns);
640 if (ret == 0)
641 return -ENXIO;
642 else if (ret == -EOPNOTSUPP)
643 return ret;
644
645 /* probe complete, attach handles namespace enabling */
646 devm_namespace_disable(dev, ndns);
647
648 return pmem_attach_disk(dev, ndns);
649}
650
651static void nd_pmem_remove(struct device *dev)
652{
653 struct pmem_device *pmem = dev_get_drvdata(dev);
654
655 if (is_nd_btt(dev))
656 nvdimm_namespace_detach_btt(to_nd_btt(dev));
657 else {
658 /*
659 * Note, this assumes device_lock() context to not
660 * race nd_pmem_notify()
661 */
662 sysfs_put(pmem->bb_state);
663 pmem->bb_state = NULL;
664 }
665 nvdimm_flush(to_nd_region(dev->parent), NULL);
666}
667
668static void nd_pmem_shutdown(struct device *dev)
669{
670 nvdimm_flush(to_nd_region(dev->parent), NULL);
671}
672
673static void pmem_revalidate_poison(struct device *dev)
674{
675 struct nd_region *nd_region;
676 resource_size_t offset = 0, end_trunc = 0;
677 struct nd_namespace_common *ndns;
678 struct nd_namespace_io *nsio;
679 struct badblocks *bb;
680 struct range range;
681 struct kernfs_node *bb_state;
682
683 if (is_nd_btt(dev)) {
684 struct nd_btt *nd_btt = to_nd_btt(dev);
685
686 ndns = nd_btt->ndns;
687 nd_region = to_nd_region(ndns->dev.parent);
688 nsio = to_nd_namespace_io(&ndns->dev);
689 bb = &nsio->bb;
690 bb_state = NULL;
691 } else {
692 struct pmem_device *pmem = dev_get_drvdata(dev);
693
694 nd_region = to_region(pmem);
695 bb = &pmem->bb;
696 bb_state = pmem->bb_state;
697
698 if (is_nd_pfn(dev)) {
699 struct nd_pfn *nd_pfn = to_nd_pfn(dev);
700 struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
701
702 ndns = nd_pfn->ndns;
703 offset = pmem->data_offset +
704 __le32_to_cpu(pfn_sb->start_pad);
705 end_trunc = __le32_to_cpu(pfn_sb->end_trunc);
706 } else {
707 ndns = to_ndns(dev);
708 }
709
710 nsio = to_nd_namespace_io(&ndns->dev);
711 }
712
713 range.start = nsio->res.start + offset;
714 range.end = nsio->res.end - end_trunc;
715 nvdimm_badblocks_populate(nd_region, bb, &range);
716 if (bb_state)
717 sysfs_notify_dirent(bb_state);
718}
719
720static void pmem_revalidate_region(struct device *dev)
721{
722 struct pmem_device *pmem;
723
724 if (is_nd_btt(dev)) {
725 struct nd_btt *nd_btt = to_nd_btt(dev);
726 struct btt *btt = nd_btt->btt;
727
728 nvdimm_check_and_set_ro(btt->btt_disk);
729 return;
730 }
731
732 pmem = dev_get_drvdata(dev);
733 nvdimm_check_and_set_ro(pmem->disk);
734}
735
736static void nd_pmem_notify(struct device *dev, enum nvdimm_event event)
737{
738 switch (event) {
739 case NVDIMM_REVALIDATE_POISON:
740 pmem_revalidate_poison(dev);
741 break;
742 case NVDIMM_REVALIDATE_REGION:
743 pmem_revalidate_region(dev);
744 break;
745 default:
746 dev_WARN_ONCE(dev, 1, "notify: unknown event: %d\n", event);
747 break;
748 }
749}
750
751MODULE_ALIAS("pmem");
752MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_IO);
753MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_PMEM);
754static struct nd_device_driver nd_pmem_driver = {
755 .probe = nd_pmem_probe,
756 .remove = nd_pmem_remove,
757 .notify = nd_pmem_notify,
758 .shutdown = nd_pmem_shutdown,
759 .drv = {
760 .name = "nd_pmem",
761 },
762 .type = ND_DRIVER_NAMESPACE_IO | ND_DRIVER_NAMESPACE_PMEM,
763};
764
765module_nd_driver(nd_pmem_driver);
766
767MODULE_AUTHOR("Ross Zwisler <ross.zwisler@linux.intel.com>");
768MODULE_LICENSE("GPL v2");