1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright(c) 2013-2016 Intel Corporation. All rights reserved.
5 #include <linux/memremap.h>
6 #include <linux/blkdev.h>
7 #include <linux/device.h>
8 #include <linux/genhd.h>
9 #include <linux/sizes.h>
10 #include <linux/slab.h>
17 static void nd_pfn_release(struct device *dev)
19 struct nd_region *nd_region = to_nd_region(dev->parent);
20 struct nd_pfn *nd_pfn = to_nd_pfn(dev);
22 dev_dbg(dev, "trace\n");
23 nd_detach_ndns(&nd_pfn->dev, &nd_pfn->ndns);
24 ida_simple_remove(&nd_region->pfn_ida, nd_pfn->id);
29 static struct device_type nd_pfn_device_type = {
31 .release = nd_pfn_release,
34 bool is_nd_pfn(struct device *dev)
36 return dev ? dev->type == &nd_pfn_device_type : false;
38 EXPORT_SYMBOL(is_nd_pfn);
40 struct nd_pfn *to_nd_pfn(struct device *dev)
42 struct nd_pfn *nd_pfn = container_of(dev, struct nd_pfn, dev);
44 WARN_ON(!is_nd_pfn(dev));
47 EXPORT_SYMBOL(to_nd_pfn);
49 static ssize_t mode_show(struct device *dev,
50 struct device_attribute *attr, char *buf)
52 struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
54 switch (nd_pfn->mode) {
56 return sprintf(buf, "ram\n");
58 return sprintf(buf, "pmem\n");
60 return sprintf(buf, "none\n");
64 static ssize_t mode_store(struct device *dev,
65 struct device_attribute *attr, const char *buf, size_t len)
67 struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
77 if (strncmp(buf, "pmem\n", n) == 0
78 || strncmp(buf, "pmem", n) == 0) {
79 nd_pfn->mode = PFN_MODE_PMEM;
80 } else if (strncmp(buf, "ram\n", n) == 0
81 || strncmp(buf, "ram", n) == 0)
82 nd_pfn->mode = PFN_MODE_RAM;
83 else if (strncmp(buf, "none\n", n) == 0
84 || strncmp(buf, "none", n) == 0)
85 nd_pfn->mode = PFN_MODE_NONE;
89 dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
90 buf[len - 1] == '\n' ? "" : "\n");
91 nvdimm_bus_unlock(dev);
96 static DEVICE_ATTR_RW(mode);
98 static ssize_t align_show(struct device *dev,
99 struct device_attribute *attr, char *buf)
101 struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
103 return sprintf(buf, "%ld\n", nd_pfn->align);
106 static const unsigned long *nd_pfn_supported_alignments(void)
109 * This needs to be a non-static variable because the *_SIZE
110 * macros aren't always constants.
112 const unsigned long supported_alignments[] = {
114 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
116 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
122 static unsigned long data[ARRAY_SIZE(supported_alignments)];
124 memcpy(data, supported_alignments, sizeof(data));
129 static ssize_t align_store(struct device *dev,
130 struct device_attribute *attr, const char *buf, size_t len)
132 struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
136 nvdimm_bus_lock(dev);
137 rc = nd_size_select_store(dev, buf, &nd_pfn->align,
138 nd_pfn_supported_alignments());
139 dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
140 buf[len - 1] == '\n' ? "" : "\n");
141 nvdimm_bus_unlock(dev);
144 return rc ? rc : len;
146 static DEVICE_ATTR_RW(align);
148 static ssize_t uuid_show(struct device *dev,
149 struct device_attribute *attr, char *buf)
151 struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
154 return sprintf(buf, "%pUb\n", nd_pfn->uuid);
155 return sprintf(buf, "\n");
158 static ssize_t uuid_store(struct device *dev,
159 struct device_attribute *attr, const char *buf, size_t len)
161 struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
165 rc = nd_uuid_store(dev, &nd_pfn->uuid, buf, len);
166 dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
167 buf[len - 1] == '\n' ? "" : "\n");
170 return rc ? rc : len;
172 static DEVICE_ATTR_RW(uuid);
174 static ssize_t namespace_show(struct device *dev,
175 struct device_attribute *attr, char *buf)
177 struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
180 nvdimm_bus_lock(dev);
181 rc = sprintf(buf, "%s\n", nd_pfn->ndns
182 ? dev_name(&nd_pfn->ndns->dev) : "");
183 nvdimm_bus_unlock(dev);
187 static ssize_t namespace_store(struct device *dev,
188 struct device_attribute *attr, const char *buf, size_t len)
190 struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
194 nvdimm_bus_lock(dev);
195 rc = nd_namespace_store(dev, &nd_pfn->ndns, buf, len);
196 dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
197 buf[len - 1] == '\n' ? "" : "\n");
198 nvdimm_bus_unlock(dev);
203 static DEVICE_ATTR_RW(namespace);
205 static ssize_t resource_show(struct device *dev,
206 struct device_attribute *attr, char *buf)
208 struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
213 struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
214 u64 offset = __le64_to_cpu(pfn_sb->dataoff);
215 struct nd_namespace_common *ndns = nd_pfn->ndns;
216 u32 start_pad = __le32_to_cpu(pfn_sb->start_pad);
217 struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
219 rc = sprintf(buf, "%#llx\n", (unsigned long long) nsio->res.start
220 + start_pad + offset);
222 /* no address to convey if the pfn instance is disabled */
229 static DEVICE_ATTR_RO(resource);
231 static ssize_t size_show(struct device *dev,
232 struct device_attribute *attr, char *buf)
234 struct nd_pfn *nd_pfn = to_nd_pfn_safe(dev);
239 struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
240 u64 offset = __le64_to_cpu(pfn_sb->dataoff);
241 struct nd_namespace_common *ndns = nd_pfn->ndns;
242 u32 start_pad = __le32_to_cpu(pfn_sb->start_pad);
243 u32 end_trunc = __le32_to_cpu(pfn_sb->end_trunc);
244 struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
246 rc = sprintf(buf, "%llu\n", (unsigned long long)
247 resource_size(&nsio->res) - start_pad
248 - end_trunc - offset);
250 /* no size to convey if the pfn instance is disabled */
257 static DEVICE_ATTR_RO(size);
259 static ssize_t supported_alignments_show(struct device *dev,
260 struct device_attribute *attr, char *buf)
262 return nd_size_select_show(0, nd_pfn_supported_alignments(), buf);
264 static DEVICE_ATTR_RO(supported_alignments);
266 static struct attribute *nd_pfn_attributes[] = {
268 &dev_attr_namespace.attr,
270 &dev_attr_align.attr,
271 &dev_attr_resource.attr,
273 &dev_attr_supported_alignments.attr,
277 static umode_t pfn_visible(struct kobject *kobj, struct attribute *a, int n)
279 if (a == &dev_attr_resource.attr)
284 struct attribute_group nd_pfn_attribute_group = {
285 .attrs = nd_pfn_attributes,
286 .is_visible = pfn_visible,
289 static const struct attribute_group *nd_pfn_attribute_groups[] = {
290 &nd_pfn_attribute_group,
291 &nd_device_attribute_group,
292 &nd_numa_attribute_group,
296 struct device *nd_pfn_devinit(struct nd_pfn *nd_pfn,
297 struct nd_namespace_common *ndns)
304 nd_pfn->mode = PFN_MODE_NONE;
305 nd_pfn->align = PFN_DEFAULT_ALIGNMENT;
307 device_initialize(&nd_pfn->dev);
308 if (ndns && !__nd_attach_ndns(&nd_pfn->dev, ndns, &nd_pfn->ndns)) {
309 dev_dbg(&ndns->dev, "failed, already claimed by %s\n",
310 dev_name(ndns->claim));
317 static struct nd_pfn *nd_pfn_alloc(struct nd_region *nd_region)
319 struct nd_pfn *nd_pfn;
322 nd_pfn = kzalloc(sizeof(*nd_pfn), GFP_KERNEL);
326 nd_pfn->id = ida_simple_get(&nd_region->pfn_ida, 0, 0, GFP_KERNEL);
327 if (nd_pfn->id < 0) {
333 dev_set_name(dev, "pfn%d.%d", nd_region->id, nd_pfn->id);
334 dev->groups = nd_pfn_attribute_groups;
335 dev->type = &nd_pfn_device_type;
336 dev->parent = &nd_region->dev;
341 struct device *nd_pfn_create(struct nd_region *nd_region)
343 struct nd_pfn *nd_pfn;
346 if (!is_memory(&nd_region->dev))
349 nd_pfn = nd_pfn_alloc(nd_region);
350 dev = nd_pfn_devinit(nd_pfn, NULL);
352 __nd_device_register(dev);
357 * nd_pfn_clear_memmap_errors() clears any errors in the volatile memmap
358 * space associated with the namespace. If the memmap is set to DRAM, then
359 * this is a no-op. Since the memmap area is freshly initialized during
360 * probe, we have an opportunity to clear any badblocks in this area.
362 static int nd_pfn_clear_memmap_errors(struct nd_pfn *nd_pfn)
364 struct nd_region *nd_region = to_nd_region(nd_pfn->dev.parent);
365 struct nd_namespace_common *ndns = nd_pfn->ndns;
366 void *zero_page = page_address(ZERO_PAGE(0));
367 struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
368 int num_bad, meta_num, rc, bb_present;
369 sector_t first_bad, meta_start;
370 struct nd_namespace_io *nsio;
372 if (nd_pfn->mode != PFN_MODE_PMEM)
375 nsio = to_nd_namespace_io(&ndns->dev);
376 meta_start = (SZ_4K + sizeof(*pfn_sb)) >> 9;
377 meta_num = (le64_to_cpu(pfn_sb->dataoff) >> 9) - meta_start;
380 unsigned long zero_len;
383 bb_present = badblocks_check(&nd_region->bb, meta_start,
384 meta_num, &first_bad, &num_bad);
386 dev_dbg(&nd_pfn->dev, "meta: %x badblocks at %llx\n",
388 nsoff = ALIGN_DOWN((nd_region->ndr_start
389 + (first_bad << 9)) - nsio->res.start,
391 zero_len = ALIGN(num_bad << 9, PAGE_SIZE);
393 unsigned long chunk = min(zero_len, PAGE_SIZE);
395 rc = nvdimm_write_bytes(ndns, nsoff, zero_page,
404 dev_err(&nd_pfn->dev,
405 "error clearing %x badblocks at %llx\n",
410 } while (bb_present);
415 int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
417 u64 checksum, offset;
418 enum nd_pfn_mode mode;
419 struct nd_namespace_io *nsio;
420 unsigned long align, start_pad;
421 struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
422 struct nd_namespace_common *ndns = nd_pfn->ndns;
423 const u8 *parent_uuid = nd_dev_to_uuid(&ndns->dev);
425 if (!pfn_sb || !ndns)
428 if (!is_memory(nd_pfn->dev.parent))
431 if (nvdimm_read_bytes(ndns, SZ_4K, pfn_sb, sizeof(*pfn_sb), 0))
434 if (memcmp(pfn_sb->signature, sig, PFN_SIG_LEN) != 0)
437 checksum = le64_to_cpu(pfn_sb->checksum);
438 pfn_sb->checksum = 0;
439 if (checksum != nd_sb_checksum((struct nd_gen_sb *) pfn_sb))
441 pfn_sb->checksum = cpu_to_le64(checksum);
443 if (memcmp(pfn_sb->parent_uuid, parent_uuid, 16) != 0)
446 if (__le16_to_cpu(pfn_sb->version_minor) < 1) {
447 pfn_sb->start_pad = 0;
448 pfn_sb->end_trunc = 0;
451 if (__le16_to_cpu(pfn_sb->version_minor) < 2)
454 switch (le32_to_cpu(pfn_sb->mode)) {
462 align = le32_to_cpu(pfn_sb->align);
463 offset = le64_to_cpu(pfn_sb->dataoff);
464 start_pad = le32_to_cpu(pfn_sb->start_pad);
466 align = 1UL << ilog2(offset);
467 mode = le32_to_cpu(pfn_sb->mode);
471 * When probing a namepace via nd_pfn_probe() the uuid
472 * is NULL (see: nd_pfn_devinit()) we init settings from
475 nd_pfn->uuid = kmemdup(pfn_sb->uuid, 16, GFP_KERNEL);
478 nd_pfn->align = align;
482 * When probing a pfn / dax instance we validate the
483 * live settings against the pfn_sb
485 if (memcmp(nd_pfn->uuid, pfn_sb->uuid, 16) != 0)
489 * If the uuid validates, but other settings mismatch
490 * return EINVAL because userspace has managed to change
491 * the configuration without specifying new
494 if (nd_pfn->align != align || nd_pfn->mode != mode) {
495 dev_err(&nd_pfn->dev,
496 "init failed, settings mismatch\n");
497 dev_dbg(&nd_pfn->dev, "align: %lx:%lx mode: %d:%d\n",
498 nd_pfn->align, align, nd_pfn->mode,
504 if (align > nvdimm_namespace_capacity(ndns)) {
505 dev_err(&nd_pfn->dev, "alignment: %lx exceeds capacity %llx\n",
506 align, nvdimm_namespace_capacity(ndns));
511 * These warnings are verbose because they can only trigger in
512 * the case where the physical address alignment of the
513 * namespace has changed since the pfn superblock was
516 nsio = to_nd_namespace_io(&ndns->dev);
517 if (offset >= resource_size(&nsio->res)) {
518 dev_err(&nd_pfn->dev, "pfn array size exceeds capacity of %s\n",
519 dev_name(&ndns->dev));
523 if ((align && !IS_ALIGNED(nsio->res.start + offset + start_pad, align))
524 || !IS_ALIGNED(offset, PAGE_SIZE)) {
525 dev_err(&nd_pfn->dev,
526 "bad offset: %#llx dax disabled align: %#lx\n",
531 return nd_pfn_clear_memmap_errors(nd_pfn);
533 EXPORT_SYMBOL(nd_pfn_validate);
535 int nd_pfn_probe(struct device *dev, struct nd_namespace_common *ndns)
538 struct nd_pfn *nd_pfn;
539 struct device *pfn_dev;
540 struct nd_pfn_sb *pfn_sb;
541 struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
546 switch (ndns->claim_class) {
547 case NVDIMM_CCLASS_NONE:
548 case NVDIMM_CCLASS_PFN:
554 nvdimm_bus_lock(&ndns->dev);
555 nd_pfn = nd_pfn_alloc(nd_region);
556 pfn_dev = nd_pfn_devinit(nd_pfn, ndns);
557 nvdimm_bus_unlock(&ndns->dev);
560 pfn_sb = devm_kzalloc(dev, sizeof(*pfn_sb), GFP_KERNEL);
561 nd_pfn = to_nd_pfn(pfn_dev);
562 nd_pfn->pfn_sb = pfn_sb;
563 rc = nd_pfn_validate(nd_pfn, PFN_SIG);
564 dev_dbg(dev, "pfn: %s\n", rc == 0 ? dev_name(pfn_dev) : "<none>");
566 nd_detach_ndns(pfn_dev, &nd_pfn->ndns);
569 __nd_device_register(pfn_dev);
573 EXPORT_SYMBOL(nd_pfn_probe);
575 static u32 info_block_reserve(void)
577 return ALIGN(SZ_8K, PAGE_SIZE);
581 * We hotplug memory at section granularity, pad the reserved area from
582 * the previous section base to the namespace base address.
584 static unsigned long init_altmap_base(resource_size_t base)
586 unsigned long base_pfn = PHYS_PFN(base);
588 return PFN_SECTION_ALIGN_DOWN(base_pfn);
591 static unsigned long init_altmap_reserve(resource_size_t base)
593 unsigned long reserve = info_block_reserve() >> PAGE_SHIFT;
594 unsigned long base_pfn = PHYS_PFN(base);
596 reserve += base_pfn - PFN_SECTION_ALIGN_DOWN(base_pfn);
600 static int __nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap)
602 struct resource *res = &pgmap->res;
603 struct vmem_altmap *altmap = &pgmap->altmap;
604 struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
605 u64 offset = le64_to_cpu(pfn_sb->dataoff);
606 u32 start_pad = __le32_to_cpu(pfn_sb->start_pad);
607 u32 end_trunc = __le32_to_cpu(pfn_sb->end_trunc);
608 u32 reserve = info_block_reserve();
609 struct nd_namespace_common *ndns = nd_pfn->ndns;
610 struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
611 resource_size_t base = nsio->res.start + start_pad;
612 struct vmem_altmap __altmap = {
613 .base_pfn = init_altmap_base(base),
614 .reserve = init_altmap_reserve(base),
617 memcpy(res, &nsio->res, sizeof(*res));
618 res->start += start_pad;
619 res->end -= end_trunc;
621 if (nd_pfn->mode == PFN_MODE_RAM) {
622 if (offset < reserve)
624 nd_pfn->npfns = le64_to_cpu(pfn_sb->npfns);
625 pgmap->altmap_valid = false;
626 } else if (nd_pfn->mode == PFN_MODE_PMEM) {
627 nd_pfn->npfns = PFN_SECTION_ALIGN_UP((resource_size(res)
628 - offset) / PAGE_SIZE);
629 if (le64_to_cpu(nd_pfn->pfn_sb->npfns) > nd_pfn->npfns)
630 dev_info(&nd_pfn->dev,
631 "number of pfns truncated from %lld to %ld\n",
632 le64_to_cpu(nd_pfn->pfn_sb->npfns),
634 memcpy(altmap, &__altmap, sizeof(*altmap));
635 altmap->free = PHYS_PFN(offset - reserve);
637 pgmap->altmap_valid = true;
644 static u64 phys_pmem_align_down(struct nd_pfn *nd_pfn, u64 phys)
646 return min_t(u64, PHYS_SECTION_ALIGN_DOWN(phys),
647 ALIGN_DOWN(phys, nd_pfn->align));
651 * Check if pmem collides with 'System RAM', or other regions when
652 * section aligned. Trim it accordingly.
654 static void trim_pfn_device(struct nd_pfn *nd_pfn, u32 *start_pad, u32 *end_trunc)
656 struct nd_namespace_common *ndns = nd_pfn->ndns;
657 struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
658 struct nd_region *nd_region = to_nd_region(nd_pfn->dev.parent);
659 const resource_size_t start = nsio->res.start;
660 const resource_size_t end = start + resource_size(&nsio->res);
661 resource_size_t adjust, size;
666 adjust = start - PHYS_SECTION_ALIGN_DOWN(start);
667 size = resource_size(&nsio->res) + adjust;
668 if (region_intersects(start - adjust, size, IORESOURCE_SYSTEM_RAM,
669 IORES_DESC_NONE) == REGION_MIXED
670 || nd_region_conflict(nd_region, start - adjust, size))
671 *start_pad = PHYS_SECTION_ALIGN_UP(start) - start;
673 /* Now check that end of the range does not collide. */
674 adjust = PHYS_SECTION_ALIGN_UP(end) - end;
675 size = resource_size(&nsio->res) + adjust;
676 if (region_intersects(start, size, IORESOURCE_SYSTEM_RAM,
677 IORES_DESC_NONE) == REGION_MIXED
678 || !IS_ALIGNED(end, nd_pfn->align)
679 || nd_region_conflict(nd_region, start, size))
680 *end_trunc = end - phys_pmem_align_down(nd_pfn, end);
683 static int nd_pfn_init(struct nd_pfn *nd_pfn)
685 struct nd_namespace_common *ndns = nd_pfn->ndns;
686 struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
687 u32 start_pad, end_trunc, reserve = info_block_reserve();
688 resource_size_t start, size;
689 struct nd_region *nd_region;
690 struct nd_pfn_sb *pfn_sb;
697 pfn_sb = devm_kzalloc(&nd_pfn->dev, sizeof(*pfn_sb), GFP_KERNEL);
701 nd_pfn->pfn_sb = pfn_sb;
702 if (is_nd_dax(&nd_pfn->dev))
706 rc = nd_pfn_validate(nd_pfn, sig);
710 /* no info block, do init */;
711 nd_region = to_nd_region(nd_pfn->dev.parent);
713 dev_info(&nd_pfn->dev,
714 "%s is read-only, unable to init metadata\n",
715 dev_name(&nd_region->dev));
719 memset(pfn_sb, 0, sizeof(*pfn_sb));
721 trim_pfn_device(nd_pfn, &start_pad, &end_trunc);
722 if (start_pad + end_trunc)
723 dev_info(&nd_pfn->dev, "%s alignment collision, truncate %d bytes\n",
724 dev_name(&ndns->dev), start_pad + end_trunc);
727 * Note, we use 64 here for the standard size of struct page,
728 * debugging options may cause it to be larger in which case the
729 * implementation will limit the pfns advertised through
730 * ->direct_access() to those that are included in the memmap.
732 start = nsio->res.start + start_pad;
733 size = resource_size(&nsio->res);
734 npfns = PFN_SECTION_ALIGN_UP((size - start_pad - end_trunc - reserve)
736 if (nd_pfn->mode == PFN_MODE_PMEM) {
738 * The altmap should be padded out to the block size used
739 * when populating the vmemmap. This *should* be equal to
740 * PMD_SIZE for most architectures.
742 offset = ALIGN(start + reserve + 64 * npfns,
743 max(nd_pfn->align, PMD_SIZE)) - start;
744 } else if (nd_pfn->mode == PFN_MODE_RAM)
745 offset = ALIGN(start + reserve, nd_pfn->align) - start;
749 if (offset + start_pad + end_trunc >= size) {
750 dev_err(&nd_pfn->dev, "%s unable to satisfy requested alignment\n",
751 dev_name(&ndns->dev));
755 npfns = (size - offset - start_pad - end_trunc) / SZ_4K;
756 pfn_sb->mode = cpu_to_le32(nd_pfn->mode);
757 pfn_sb->dataoff = cpu_to_le64(offset);
758 pfn_sb->npfns = cpu_to_le64(npfns);
759 memcpy(pfn_sb->signature, sig, PFN_SIG_LEN);
760 memcpy(pfn_sb->uuid, nd_pfn->uuid, 16);
761 memcpy(pfn_sb->parent_uuid, nd_dev_to_uuid(&ndns->dev), 16);
762 pfn_sb->version_major = cpu_to_le16(1);
763 pfn_sb->version_minor = cpu_to_le16(2);
764 pfn_sb->start_pad = cpu_to_le32(start_pad);
765 pfn_sb->end_trunc = cpu_to_le32(end_trunc);
766 pfn_sb->align = cpu_to_le32(nd_pfn->align);
767 checksum = nd_sb_checksum((struct nd_gen_sb *) pfn_sb);
768 pfn_sb->checksum = cpu_to_le64(checksum);
770 return nvdimm_write_bytes(ndns, SZ_4K, pfn_sb, sizeof(*pfn_sb), 0);
774 * Determine the effective resource range and vmem_altmap from an nd_pfn
777 int nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap)
781 if (!nd_pfn->uuid || !nd_pfn->ndns)
784 rc = nd_pfn_init(nd_pfn);
788 /* we need a valid pfn_sb before we can init a dev_pagemap */
789 return __nvdimm_setup_pfn(nd_pfn, pgmap);
791 EXPORT_SYMBOL_GPL(nvdimm_setup_pfn);