2 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 #include <linux/module.h>
14 #include <linux/device.h>
15 #include <linux/sort.h>
16 #include <linux/slab.h>
17 #include <linux/pmem.h>
18 #include <linux/list.h>
23 static void namespace_io_release(struct device *dev)
25 struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
30 static void namespace_pmem_release(struct device *dev)
32 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
33 struct nd_region *nd_region = to_nd_region(dev->parent);
36 ida_simple_remove(&nd_region->ns_ida, nspm->id);
37 kfree(nspm->alt_name);
42 static void namespace_blk_release(struct device *dev)
44 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
45 struct nd_region *nd_region = to_nd_region(dev->parent);
48 ida_simple_remove(&nd_region->ns_ida, nsblk->id);
49 kfree(nsblk->alt_name);
55 static const struct device_type namespace_io_device_type = {
56 .name = "nd_namespace_io",
57 .release = namespace_io_release,
60 static const struct device_type namespace_pmem_device_type = {
61 .name = "nd_namespace_pmem",
62 .release = namespace_pmem_release,
65 static const struct device_type namespace_blk_device_type = {
66 .name = "nd_namespace_blk",
67 .release = namespace_blk_release,
70 static bool is_namespace_pmem(const struct device *dev)
72 return dev ? dev->type == &namespace_pmem_device_type : false;
75 static bool is_namespace_blk(const struct device *dev)
77 return dev ? dev->type == &namespace_blk_device_type : false;
80 static bool is_namespace_io(const struct device *dev)
82 return dev ? dev->type == &namespace_io_device_type : false;
85 static int is_uuid_busy(struct device *dev, void *data)
87 u8 *uuid1 = data, *uuid2 = NULL;
89 if (is_namespace_pmem(dev)) {
90 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
93 } else if (is_namespace_blk(dev)) {
94 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
97 } else if (is_nd_btt(dev)) {
98 struct nd_btt *nd_btt = to_nd_btt(dev);
100 uuid2 = nd_btt->uuid;
101 } else if (is_nd_pfn(dev)) {
102 struct nd_pfn *nd_pfn = to_nd_pfn(dev);
104 uuid2 = nd_pfn->uuid;
107 if (uuid2 && memcmp(uuid1, uuid2, NSLABEL_UUID_LEN) == 0)
113 static int is_namespace_uuid_busy(struct device *dev, void *data)
115 if (is_nd_pmem(dev) || is_nd_blk(dev))
116 return device_for_each_child(dev, data, is_uuid_busy);
121 * nd_is_uuid_unique - verify that no other namespace has @uuid
122 * @dev: any device on a nvdimm_bus
123 * @uuid: uuid to check
125 bool nd_is_uuid_unique(struct device *dev, u8 *uuid)
127 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
131 WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm_bus->dev));
132 if (device_for_each_child(&nvdimm_bus->dev, uuid,
133 is_namespace_uuid_busy) != 0)
138 bool pmem_should_map_pages(struct device *dev)
140 struct nd_region *nd_region = to_nd_region(dev->parent);
141 struct nd_namespace_io *nsio;
143 if (!IS_ENABLED(CONFIG_ZONE_DEVICE))
146 if (!test_bit(ND_REGION_PAGEMAP, &nd_region->flags))
149 if (is_nd_pfn(dev) || is_nd_btt(dev))
152 nsio = to_nd_namespace_io(dev);
153 if (region_intersects(nsio->res.start, resource_size(&nsio->res),
154 IORESOURCE_SYSTEM_RAM,
155 IORES_DESC_NONE) == REGION_MIXED)
158 #ifdef ARCH_MEMREMAP_PMEM
159 return ARCH_MEMREMAP_PMEM == MEMREMAP_WB;
164 EXPORT_SYMBOL(pmem_should_map_pages);
166 const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
169 struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
170 const char *suffix = NULL;
172 if (ndns->claim && is_nd_btt(ndns->claim))
175 if (is_namespace_pmem(&ndns->dev) || is_namespace_io(&ndns->dev)) {
178 if (is_namespace_pmem(&ndns->dev)) {
179 struct nd_namespace_pmem *nspm;
181 nspm = to_nd_namespace_pmem(&ndns->dev);
186 sprintf(name, "pmem%d.%d%s", nd_region->id, nsidx,
187 suffix ? suffix : "");
189 sprintf(name, "pmem%d%s", nd_region->id,
190 suffix ? suffix : "");
191 } else if (is_namespace_blk(&ndns->dev)) {
192 struct nd_namespace_blk *nsblk;
194 nsblk = to_nd_namespace_blk(&ndns->dev);
195 sprintf(name, "ndblk%d.%d%s", nd_region->id, nsblk->id,
196 suffix ? suffix : "");
203 EXPORT_SYMBOL(nvdimm_namespace_disk_name);
205 const u8 *nd_dev_to_uuid(struct device *dev)
207 static const u8 null_uuid[16];
212 if (is_namespace_pmem(dev)) {
213 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
216 } else if (is_namespace_blk(dev)) {
217 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
223 EXPORT_SYMBOL(nd_dev_to_uuid);
225 static ssize_t nstype_show(struct device *dev,
226 struct device_attribute *attr, char *buf)
228 struct nd_region *nd_region = to_nd_region(dev->parent);
230 return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region));
232 static DEVICE_ATTR_RO(nstype);
234 static ssize_t __alt_name_store(struct device *dev, const char *buf,
237 char *input, *pos, *alt_name, **ns_altname;
240 if (is_namespace_pmem(dev)) {
241 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
243 ns_altname = &nspm->alt_name;
244 } else if (is_namespace_blk(dev)) {
245 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
247 ns_altname = &nsblk->alt_name;
251 if (dev->driver || to_ndns(dev)->claim)
254 input = kmemdup(buf, len + 1, GFP_KERNEL);
260 if (strlen(pos) + 1 > NSLABEL_NAME_LEN) {
265 alt_name = kzalloc(NSLABEL_NAME_LEN, GFP_KERNEL);
271 *ns_altname = alt_name;
272 sprintf(*ns_altname, "%s", pos);
280 static resource_size_t nd_namespace_blk_size(struct nd_namespace_blk *nsblk)
282 struct nd_region *nd_region = to_nd_region(nsblk->common.dev.parent);
283 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
284 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
285 struct nd_label_id label_id;
286 resource_size_t size = 0;
287 struct resource *res;
291 nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
292 for_each_dpa_resource(ndd, res)
293 if (strcmp(res->name, label_id.id) == 0)
294 size += resource_size(res);
298 static bool __nd_namespace_blk_validate(struct nd_namespace_blk *nsblk)
300 struct nd_region *nd_region = to_nd_region(nsblk->common.dev.parent);
301 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
302 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
303 struct nd_label_id label_id;
304 struct resource *res;
307 if (!nsblk->uuid || !nsblk->lbasize || !ndd)
311 nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
312 for_each_dpa_resource(ndd, res) {
313 if (strcmp(res->name, label_id.id) != 0)
316 * Resources with unacknowledged adjustments indicate a
317 * failure to update labels
319 if (res->flags & DPA_RESOURCE_ADJUSTED)
324 /* These values match after a successful label update */
325 if (count != nsblk->num_resources)
328 for (i = 0; i < nsblk->num_resources; i++) {
329 struct resource *found = NULL;
331 for_each_dpa_resource(ndd, res)
332 if (res == nsblk->res[i]) {
344 resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk)
346 resource_size_t size;
348 nvdimm_bus_lock(&nsblk->common.dev);
349 size = __nd_namespace_blk_validate(nsblk);
350 nvdimm_bus_unlock(&nsblk->common.dev);
354 EXPORT_SYMBOL(nd_namespace_blk_validate);
357 static int nd_namespace_label_update(struct nd_region *nd_region,
360 dev_WARN_ONCE(dev, dev->driver || to_ndns(dev)->claim,
361 "namespace must be idle during label update\n");
362 if (dev->driver || to_ndns(dev)->claim)
366 * Only allow label writes that will result in a valid namespace
367 * or deletion of an existing namespace.
369 if (is_namespace_pmem(dev)) {
370 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
371 resource_size_t size = resource_size(&nspm->nsio.res);
373 if (size == 0 && nspm->uuid)
374 /* delete allocation */;
375 else if (!nspm->uuid)
378 return nd_pmem_namespace_label_update(nd_region, nspm, size);
379 } else if (is_namespace_blk(dev)) {
380 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
381 resource_size_t size = nd_namespace_blk_size(nsblk);
383 if (size == 0 && nsblk->uuid)
384 /* delete allocation */;
385 else if (!nsblk->uuid || !nsblk->lbasize)
388 return nd_blk_namespace_label_update(nd_region, nsblk, size);
393 static ssize_t alt_name_store(struct device *dev,
394 struct device_attribute *attr, const char *buf, size_t len)
396 struct nd_region *nd_region = to_nd_region(dev->parent);
400 nvdimm_bus_lock(dev);
401 wait_nvdimm_bus_probe_idle(dev);
402 rc = __alt_name_store(dev, buf, len);
404 rc = nd_namespace_label_update(nd_region, dev);
405 dev_dbg(dev, "%s: %s(%zd)\n", __func__, rc < 0 ? "fail " : "", rc);
406 nvdimm_bus_unlock(dev);
409 return rc < 0 ? rc : len;
412 static ssize_t alt_name_show(struct device *dev,
413 struct device_attribute *attr, char *buf)
417 if (is_namespace_pmem(dev)) {
418 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
420 ns_altname = nspm->alt_name;
421 } else if (is_namespace_blk(dev)) {
422 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
424 ns_altname = nsblk->alt_name;
428 return sprintf(buf, "%s\n", ns_altname ? ns_altname : "");
430 static DEVICE_ATTR_RW(alt_name);
432 static int scan_free(struct nd_region *nd_region,
433 struct nd_mapping *nd_mapping, struct nd_label_id *label_id,
436 bool is_blk = strncmp(label_id->id, "blk", 3) == 0;
437 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
441 struct resource *res, *last;
442 resource_size_t new_start;
445 for_each_dpa_resource(ndd, res)
446 if (strcmp(res->name, label_id->id) == 0)
452 if (n >= resource_size(res)) {
453 n -= resource_size(res);
454 nd_dbg_dpa(nd_region, ndd, res, "delete %d\n", rc);
455 nvdimm_free_dpa(ndd, res);
456 /* retry with last resource deleted */
461 * Keep BLK allocations relegated to high DPA as much as
465 new_start = res->start + n;
467 new_start = res->start;
469 rc = adjust_resource(res, new_start, resource_size(res) - n);
471 res->flags |= DPA_RESOURCE_ADJUSTED;
472 nd_dbg_dpa(nd_region, ndd, res, "shrink %d\n", rc);
480 * shrink_dpa_allocation - for each dimm in region free n bytes for label_id
481 * @nd_region: the set of dimms to reclaim @n bytes from
482 * @label_id: unique identifier for the namespace consuming this dpa range
483 * @n: number of bytes per-dimm to release
485 * Assumes resources are ordered. Starting from the end try to
486 * adjust_resource() the allocation to @n, but if @n is larger than the
487 * allocation delete it and find the 'new' last allocation in the label
490 static int shrink_dpa_allocation(struct nd_region *nd_region,
491 struct nd_label_id *label_id, resource_size_t n)
495 for (i = 0; i < nd_region->ndr_mappings; i++) {
496 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
499 rc = scan_free(nd_region, nd_mapping, label_id, n);
507 static resource_size_t init_dpa_allocation(struct nd_label_id *label_id,
508 struct nd_region *nd_region, struct nd_mapping *nd_mapping,
511 bool is_blk = strncmp(label_id->id, "blk", 3) == 0;
512 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
513 resource_size_t first_dpa;
514 struct resource *res;
517 /* allocate blk from highest dpa first */
519 first_dpa = nd_mapping->start + nd_mapping->size - n;
521 first_dpa = nd_mapping->start;
523 /* first resource allocation for this label-id or dimm */
524 res = nvdimm_allocate_dpa(ndd, label_id, first_dpa, n);
528 nd_dbg_dpa(nd_region, ndd, res, "init %d\n", rc);
534 * space_valid() - validate free dpa space against constraints
535 * @nd_region: hosting region of the free space
536 * @ndd: dimm device data for debug
537 * @label_id: namespace id to allocate space
538 * @prev: potential allocation that precedes free space
539 * @next: allocation that follows the given free space range
540 * @exist: first allocation with same id in the mapping
541 * @n: range that must satisfied for pmem allocations
542 * @valid: free space range to validate
544 * BLK-space is valid as long as it does not precede a PMEM
545 * allocation in a given region. PMEM-space must be contiguous
546 * and adjacent to an existing existing allocation (if one
547 * exists). If reserving PMEM any space is valid.
549 static void space_valid(struct nd_region *nd_region, struct nvdimm_drvdata *ndd,
550 struct nd_label_id *label_id, struct resource *prev,
551 struct resource *next, struct resource *exist,
552 resource_size_t n, struct resource *valid)
554 bool is_reserve = strcmp(label_id->id, "pmem-reserve") == 0;
555 bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
557 if (valid->start >= valid->end)
564 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
565 struct nvdimm_bus *nvdimm_bus;
566 struct blk_alloc_info info = {
567 .nd_mapping = nd_mapping,
568 .available = nd_mapping->size,
572 WARN_ON(!is_nd_blk(&nd_region->dev));
573 nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
574 device_for_each_child(&nvdimm_bus->dev, &info, alias_dpa_busy);
578 /* allocation needs to be contiguous, so this is all or nothing */
579 if (resource_size(valid) < n)
582 /* we've got all the space we need and no existing allocation */
586 /* allocation needs to be contiguous with the existing namespace */
587 if (valid->start == exist->end + 1
588 || valid->end == exist->start - 1)
592 /* truncate @valid size to 0 */
593 valid->end = valid->start - 1;
597 ALLOC_ERR = 0, ALLOC_BEFORE, ALLOC_MID, ALLOC_AFTER,
600 static resource_size_t scan_allocate(struct nd_region *nd_region,
601 struct nd_mapping *nd_mapping, struct nd_label_id *label_id,
604 resource_size_t mapping_end = nd_mapping->start + nd_mapping->size - 1;
605 bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
606 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
607 struct resource *res, *exist = NULL, valid;
608 const resource_size_t to_allocate = n;
611 for_each_dpa_resource(ndd, res)
612 if (strcmp(label_id->id, res->name) == 0)
615 valid.start = nd_mapping->start;
616 valid.end = mapping_end;
617 valid.name = "free space";
620 for_each_dpa_resource(ndd, res) {
621 struct resource *next = res->sibling, *new_res = NULL;
622 resource_size_t allocate, available = 0;
623 enum alloc_loc loc = ALLOC_ERR;
627 /* ignore resources outside this nd_mapping */
628 if (res->start > mapping_end)
630 if (res->end < nd_mapping->start)
633 /* space at the beginning of the mapping */
634 if (!first++ && res->start > nd_mapping->start) {
635 valid.start = nd_mapping->start;
636 valid.end = res->start - 1;
637 space_valid(nd_region, ndd, label_id, NULL, next, exist,
638 to_allocate, &valid);
639 available = resource_size(&valid);
644 /* space between allocations */
646 valid.start = res->start + resource_size(res);
647 valid.end = min(mapping_end, next->start - 1);
648 space_valid(nd_region, ndd, label_id, res, next, exist,
649 to_allocate, &valid);
650 available = resource_size(&valid);
655 /* space at the end of the mapping */
657 valid.start = res->start + resource_size(res);
658 valid.end = mapping_end;
659 space_valid(nd_region, ndd, label_id, res, next, exist,
660 to_allocate, &valid);
661 available = resource_size(&valid);
666 if (!loc || !available)
668 allocate = min(available, n);
671 if (strcmp(res->name, label_id->id) == 0) {
672 /* adjust current resource up */
673 rc = adjust_resource(res, res->start - allocate,
674 resource_size(res) + allocate);
675 action = "cur grow up";
680 if (strcmp(next->name, label_id->id) == 0) {
681 /* adjust next resource up */
682 rc = adjust_resource(next, next->start
683 - allocate, resource_size(next)
686 action = "next grow up";
687 } else if (strcmp(res->name, label_id->id) == 0) {
688 action = "grow down";
693 if (strcmp(res->name, label_id->id) == 0)
694 action = "grow down";
702 if (strcmp(action, "allocate") == 0) {
703 /* BLK allocate bottom up */
705 valid.start += available - allocate;
707 new_res = nvdimm_allocate_dpa(ndd, label_id,
708 valid.start, allocate);
711 } else if (strcmp(action, "grow down") == 0) {
712 /* adjust current resource down */
713 rc = adjust_resource(res, res->start, resource_size(res)
716 res->flags |= DPA_RESOURCE_ADJUSTED;
722 nd_dbg_dpa(nd_region, ndd, new_res, "%s(%d) %d\n",
731 * Retry scan with newly inserted resources.
732 * For example, if we did an ALLOC_BEFORE
733 * insertion there may also have been space
734 * available for an ALLOC_AFTER insertion, so we
735 * need to check this same resource again
743 * If we allocated nothing in the BLK case it may be because we are in
744 * an initial "pmem-reserve pass". Only do an initial BLK allocation
745 * when none of the DPA space is reserved.
747 if ((is_pmem || !ndd->dpa.child) && n == to_allocate)
748 return init_dpa_allocation(label_id, nd_region, nd_mapping, n);
752 static int merge_dpa(struct nd_region *nd_region,
753 struct nd_mapping *nd_mapping, struct nd_label_id *label_id)
755 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
756 struct resource *res;
758 if (strncmp("pmem", label_id->id, 4) == 0)
761 for_each_dpa_resource(ndd, res) {
763 struct resource *next = res->sibling;
764 resource_size_t end = res->start + resource_size(res);
766 if (!next || strcmp(res->name, label_id->id) != 0
767 || strcmp(next->name, label_id->id) != 0
768 || end != next->start)
770 end += resource_size(next);
771 nvdimm_free_dpa(ndd, next);
772 rc = adjust_resource(res, res->start, end - res->start);
773 nd_dbg_dpa(nd_region, ndd, res, "merge %d\n", rc);
776 res->flags |= DPA_RESOURCE_ADJUSTED;
783 static int __reserve_free_pmem(struct device *dev, void *data)
785 struct nvdimm *nvdimm = data;
786 struct nd_region *nd_region;
787 struct nd_label_id label_id;
790 if (!is_nd_pmem(dev))
793 nd_region = to_nd_region(dev);
794 if (nd_region->ndr_mappings == 0)
797 memset(&label_id, 0, sizeof(label_id));
798 strcat(label_id.id, "pmem-reserve");
799 for (i = 0; i < nd_region->ndr_mappings; i++) {
800 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
801 resource_size_t n, rem = 0;
803 if (nd_mapping->nvdimm != nvdimm)
806 n = nd_pmem_available_dpa(nd_region, nd_mapping, &rem);
809 rem = scan_allocate(nd_region, nd_mapping, &label_id, n);
810 dev_WARN_ONCE(&nd_region->dev, rem,
811 "pmem reserve underrun: %#llx of %#llx bytes\n",
812 (unsigned long long) n - rem,
813 (unsigned long long) n);
814 return rem ? -ENXIO : 0;
820 static void release_free_pmem(struct nvdimm_bus *nvdimm_bus,
821 struct nd_mapping *nd_mapping)
823 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
824 struct resource *res, *_res;
826 for_each_dpa_resource_safe(ndd, res, _res)
827 if (strcmp(res->name, "pmem-reserve") == 0)
828 nvdimm_free_dpa(ndd, res);
831 static int reserve_free_pmem(struct nvdimm_bus *nvdimm_bus,
832 struct nd_mapping *nd_mapping)
834 struct nvdimm *nvdimm = nd_mapping->nvdimm;
837 rc = device_for_each_child(&nvdimm_bus->dev, nvdimm,
838 __reserve_free_pmem);
840 release_free_pmem(nvdimm_bus, nd_mapping);
845 * grow_dpa_allocation - for each dimm allocate n bytes for @label_id
846 * @nd_region: the set of dimms to allocate @n more bytes from
847 * @label_id: unique identifier for the namespace consuming this dpa range
848 * @n: number of bytes per-dimm to add to the existing allocation
850 * Assumes resources are ordered. For BLK regions, first consume
851 * BLK-only available DPA free space, then consume PMEM-aliased DPA
852 * space starting at the highest DPA. For PMEM regions start
853 * allocations from the start of an interleave set and end at the first
854 * BLK allocation or the end of the interleave set, whichever comes
857 static int grow_dpa_allocation(struct nd_region *nd_region,
858 struct nd_label_id *label_id, resource_size_t n)
860 struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
861 bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
864 for (i = 0; i < nd_region->ndr_mappings; i++) {
865 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
866 resource_size_t rem = n;
870 * In the BLK case try once with all unallocated PMEM
871 * reserved, and once without
873 for (j = is_pmem; j < 2; j++) {
874 bool blk_only = j == 0;
877 rc = reserve_free_pmem(nvdimm_bus, nd_mapping);
881 rem = scan_allocate(nd_region, nd_mapping,
884 release_free_pmem(nvdimm_bus, nd_mapping);
886 /* try again and allow encroachments into PMEM */
891 dev_WARN_ONCE(&nd_region->dev, rem,
892 "allocation underrun: %#llx of %#llx bytes\n",
893 (unsigned long long) n - rem,
894 (unsigned long long) n);
898 rc = merge_dpa(nd_region, nd_mapping, label_id);
906 static void nd_namespace_pmem_set_resource(struct nd_region *nd_region,
907 struct nd_namespace_pmem *nspm, resource_size_t size)
909 struct resource *res = &nspm->nsio.res;
910 resource_size_t offset = 0;
912 if (size && !nspm->uuid) {
917 if (size && nspm->uuid) {
918 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
919 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
920 struct nd_label_id label_id;
921 struct resource *res;
928 nd_label_gen_id(&label_id, nspm->uuid, 0);
930 /* calculate a spa offset from the dpa allocation offset */
931 for_each_dpa_resource(ndd, res)
932 if (strcmp(res->name, label_id.id) == 0) {
933 offset = (res->start - nd_mapping->start)
934 * nd_region->ndr_mappings;
943 res->start = nd_region->ndr_start + offset;
944 res->end = res->start + size - 1;
947 static bool uuid_not_set(const u8 *uuid, struct device *dev, const char *where)
950 dev_dbg(dev, "%s: uuid not set\n", where);
956 static ssize_t __size_store(struct device *dev, unsigned long long val)
958 resource_size_t allocated = 0, available = 0;
959 struct nd_region *nd_region = to_nd_region(dev->parent);
960 struct nd_namespace_common *ndns = to_ndns(dev);
961 struct nd_mapping *nd_mapping;
962 struct nvdimm_drvdata *ndd;
963 struct nd_label_id label_id;
964 u32 flags = 0, remainder;
968 if (dev->driver || ndns->claim)
971 if (is_namespace_pmem(dev)) {
972 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
976 } else if (is_namespace_blk(dev)) {
977 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
980 flags = NSLABEL_FLAG_LOCAL;
985 * We need a uuid for the allocation-label and dimm(s) on which
986 * to store the label.
988 if (uuid_not_set(uuid, dev, __func__))
990 if (nd_region->ndr_mappings == 0) {
991 dev_dbg(dev, "%s: not associated with dimm(s)\n", __func__);
995 div_u64_rem(val, SZ_4K * nd_region->ndr_mappings, &remainder);
997 dev_dbg(dev, "%llu is not %dK aligned\n", val,
998 (SZ_4K * nd_region->ndr_mappings) / SZ_1K);
1002 nd_label_gen_id(&label_id, uuid, flags);
1003 for (i = 0; i < nd_region->ndr_mappings; i++) {
1004 nd_mapping = &nd_region->mapping[i];
1005 ndd = to_ndd(nd_mapping);
1008 * All dimms in an interleave set, or the base dimm for a blk
1009 * region, need to be enabled for the size to be changed.
1014 allocated += nvdimm_allocated_dpa(ndd, &label_id);
1016 available = nd_region_available_dpa(nd_region);
1018 if (val > available + allocated)
1021 if (val == allocated)
1024 val = div_u64(val, nd_region->ndr_mappings);
1025 allocated = div_u64(allocated, nd_region->ndr_mappings);
1026 if (val < allocated)
1027 rc = shrink_dpa_allocation(nd_region, &label_id,
1030 rc = grow_dpa_allocation(nd_region, &label_id, val - allocated);
1035 if (is_namespace_pmem(dev)) {
1036 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1038 nd_namespace_pmem_set_resource(nd_region, nspm,
1039 val * nd_region->ndr_mappings);
1043 * Try to delete the namespace if we deleted all of its
1044 * allocation, this is not the seed or 0th device for the
1045 * region, and it is not actively claimed by a btt, pfn, or dax
1048 if (val == 0 && id != 0 && nd_region->ns_seed != dev && !ndns->claim)
1049 nd_device_unregister(dev, ND_ASYNC);
1054 static ssize_t size_store(struct device *dev,
1055 struct device_attribute *attr, const char *buf, size_t len)
1057 struct nd_region *nd_region = to_nd_region(dev->parent);
1058 unsigned long long val;
1062 rc = kstrtoull(buf, 0, &val);
1067 nvdimm_bus_lock(dev);
1068 wait_nvdimm_bus_probe_idle(dev);
1069 rc = __size_store(dev, val);
1071 rc = nd_namespace_label_update(nd_region, dev);
1073 if (is_namespace_pmem(dev)) {
1074 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1077 } else if (is_namespace_blk(dev)) {
1078 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1080 uuid = &nsblk->uuid;
1083 if (rc == 0 && val == 0 && uuid) {
1084 /* setting size zero == 'delete namespace' */
1089 dev_dbg(dev, "%s: %llx %s (%d)\n", __func__, val, rc < 0
1090 ? "fail" : "success", rc);
1092 nvdimm_bus_unlock(dev);
1095 return rc < 0 ? rc : len;
1098 resource_size_t __nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
1100 struct device *dev = &ndns->dev;
1102 if (is_namespace_pmem(dev)) {
1103 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1105 return resource_size(&nspm->nsio.res);
1106 } else if (is_namespace_blk(dev)) {
1107 return nd_namespace_blk_size(to_nd_namespace_blk(dev));
1108 } else if (is_namespace_io(dev)) {
1109 struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
1111 return resource_size(&nsio->res);
1113 WARN_ONCE(1, "unknown namespace type\n");
1117 resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
1119 resource_size_t size;
1121 nvdimm_bus_lock(&ndns->dev);
1122 size = __nvdimm_namespace_capacity(ndns);
1123 nvdimm_bus_unlock(&ndns->dev);
1127 EXPORT_SYMBOL(nvdimm_namespace_capacity);
1129 static ssize_t size_show(struct device *dev,
1130 struct device_attribute *attr, char *buf)
1132 return sprintf(buf, "%llu\n", (unsigned long long)
1133 nvdimm_namespace_capacity(to_ndns(dev)));
1135 static DEVICE_ATTR(size, 0444, size_show, size_store);
1137 static u8 *namespace_to_uuid(struct device *dev)
1139 if (is_namespace_pmem(dev)) {
1140 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1143 } else if (is_namespace_blk(dev)) {
1144 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1148 return ERR_PTR(-ENXIO);
1151 static ssize_t uuid_show(struct device *dev,
1152 struct device_attribute *attr, char *buf)
1154 u8 *uuid = namespace_to_uuid(dev);
1157 return PTR_ERR(uuid);
1159 return sprintf(buf, "%pUb\n", uuid);
1160 return sprintf(buf, "\n");
1164 * namespace_update_uuid - check for a unique uuid and whether we're "renaming"
1165 * @nd_region: parent region so we can updates all dimms in the set
1166 * @dev: namespace type for generating label_id
1167 * @new_uuid: incoming uuid
1168 * @old_uuid: reference to the uuid storage location in the namespace object
1170 static int namespace_update_uuid(struct nd_region *nd_region,
1171 struct device *dev, u8 *new_uuid, u8 **old_uuid)
1173 u32 flags = is_namespace_blk(dev) ? NSLABEL_FLAG_LOCAL : 0;
1174 struct nd_label_id old_label_id;
1175 struct nd_label_id new_label_id;
1178 if (!nd_is_uuid_unique(dev, new_uuid))
1181 if (*old_uuid == NULL)
1185 * If we've already written a label with this uuid, then it's
1186 * too late to rename because we can't reliably update the uuid
1187 * without losing the old namespace. Userspace must delete this
1188 * namespace to abandon the old uuid.
1190 for (i = 0; i < nd_region->ndr_mappings; i++) {
1191 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1194 * This check by itself is sufficient because old_uuid
1195 * would be NULL above if this uuid did not exist in the
1196 * currently written set.
1198 * FIXME: can we delete uuid with zero dpa allocated?
1200 if (list_empty(&nd_mapping->labels))
1204 nd_label_gen_id(&old_label_id, *old_uuid, flags);
1205 nd_label_gen_id(&new_label_id, new_uuid, flags);
1206 for (i = 0; i < nd_region->ndr_mappings; i++) {
1207 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1208 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1209 struct resource *res;
1211 for_each_dpa_resource(ndd, res)
1212 if (strcmp(res->name, old_label_id.id) == 0)
1213 sprintf((void *) res->name, "%s",
1218 *old_uuid = new_uuid;
1222 static ssize_t uuid_store(struct device *dev,
1223 struct device_attribute *attr, const char *buf, size_t len)
1225 struct nd_region *nd_region = to_nd_region(dev->parent);
1230 if (is_namespace_pmem(dev)) {
1231 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1233 ns_uuid = &nspm->uuid;
1234 } else if (is_namespace_blk(dev)) {
1235 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1237 ns_uuid = &nsblk->uuid;
1242 nvdimm_bus_lock(dev);
1243 wait_nvdimm_bus_probe_idle(dev);
1244 if (to_ndns(dev)->claim)
1247 rc = nd_uuid_store(dev, &uuid, buf, len);
1249 rc = namespace_update_uuid(nd_region, dev, uuid, ns_uuid);
1251 rc = nd_namespace_label_update(nd_region, dev);
1254 dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
1255 rc, buf, buf[len - 1] == '\n' ? "" : "\n");
1256 nvdimm_bus_unlock(dev);
1259 return rc < 0 ? rc : len;
1261 static DEVICE_ATTR_RW(uuid);
1263 static ssize_t resource_show(struct device *dev,
1264 struct device_attribute *attr, char *buf)
1266 struct resource *res;
1268 if (is_namespace_pmem(dev)) {
1269 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1271 res = &nspm->nsio.res;
1272 } else if (is_namespace_io(dev)) {
1273 struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
1279 /* no address to convey if the namespace has no allocation */
1280 if (resource_size(res) == 0)
1282 return sprintf(buf, "%#llx\n", (unsigned long long) res->start);
1284 static DEVICE_ATTR_RO(resource);
1286 static const unsigned long ns_lbasize_supported[] = { 512, 520, 528,
1287 4096, 4104, 4160, 4224, 0 };
1289 static ssize_t sector_size_show(struct device *dev,
1290 struct device_attribute *attr, char *buf)
1292 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1294 if (!is_namespace_blk(dev))
1297 return nd_sector_size_show(nsblk->lbasize, ns_lbasize_supported, buf);
1300 static ssize_t sector_size_store(struct device *dev,
1301 struct device_attribute *attr, const char *buf, size_t len)
1303 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1304 struct nd_region *nd_region = to_nd_region(dev->parent);
1307 if (!is_namespace_blk(dev))
1311 nvdimm_bus_lock(dev);
1312 if (to_ndns(dev)->claim)
1315 rc = nd_sector_size_store(dev, buf, &nsblk->lbasize,
1316 ns_lbasize_supported);
1318 rc = nd_namespace_label_update(nd_region, dev);
1319 dev_dbg(dev, "%s: result: %zd %s: %s%s", __func__,
1320 rc, rc < 0 ? "tried" : "wrote", buf,
1321 buf[len - 1] == '\n' ? "" : "\n");
1322 nvdimm_bus_unlock(dev);
1325 return rc ? rc : len;
1327 static DEVICE_ATTR_RW(sector_size);
1329 static ssize_t dpa_extents_show(struct device *dev,
1330 struct device_attribute *attr, char *buf)
1332 struct nd_region *nd_region = to_nd_region(dev->parent);
1333 struct nd_label_id label_id;
1338 nvdimm_bus_lock(dev);
1339 if (is_namespace_pmem(dev)) {
1340 struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1344 } else if (is_namespace_blk(dev)) {
1345 struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1348 flags = NSLABEL_FLAG_LOCAL;
1354 nd_label_gen_id(&label_id, uuid, flags);
1355 for (i = 0; i < nd_region->ndr_mappings; i++) {
1356 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1357 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1358 struct resource *res;
1360 for_each_dpa_resource(ndd, res)
1361 if (strcmp(res->name, label_id.id) == 0)
1365 nvdimm_bus_unlock(dev);
1367 return sprintf(buf, "%d\n", count);
1369 static DEVICE_ATTR_RO(dpa_extents);
1371 static ssize_t holder_show(struct device *dev,
1372 struct device_attribute *attr, char *buf)
1374 struct nd_namespace_common *ndns = to_ndns(dev);
1378 rc = sprintf(buf, "%s\n", ndns->claim ? dev_name(ndns->claim) : "");
1383 static DEVICE_ATTR_RO(holder);
1385 static ssize_t mode_show(struct device *dev,
1386 struct device_attribute *attr, char *buf)
1388 struct nd_namespace_common *ndns = to_ndns(dev);
1389 struct device *claim;
1394 claim = ndns->claim;
1395 if (claim && is_nd_btt(claim))
1397 else if (claim && is_nd_pfn(claim))
1399 else if (claim && is_nd_dax(claim))
1401 else if (!claim && pmem_should_map_pages(dev))
1405 rc = sprintf(buf, "%s\n", mode);
1410 static DEVICE_ATTR_RO(mode);
1412 static ssize_t force_raw_store(struct device *dev,
1413 struct device_attribute *attr, const char *buf, size_t len)
1416 int rc = strtobool(buf, &force_raw);
1421 to_ndns(dev)->force_raw = force_raw;
1425 static ssize_t force_raw_show(struct device *dev,
1426 struct device_attribute *attr, char *buf)
1428 return sprintf(buf, "%d\n", to_ndns(dev)->force_raw);
1430 static DEVICE_ATTR_RW(force_raw);
1432 static struct attribute *nd_namespace_attributes[] = {
1433 &dev_attr_nstype.attr,
1434 &dev_attr_size.attr,
1435 &dev_attr_mode.attr,
1436 &dev_attr_uuid.attr,
1437 &dev_attr_holder.attr,
1438 &dev_attr_resource.attr,
1439 &dev_attr_alt_name.attr,
1440 &dev_attr_force_raw.attr,
1441 &dev_attr_sector_size.attr,
1442 &dev_attr_dpa_extents.attr,
1446 static umode_t namespace_visible(struct kobject *kobj,
1447 struct attribute *a, int n)
1449 struct device *dev = container_of(kobj, struct device, kobj);
1451 if (a == &dev_attr_resource.attr) {
1452 if (is_namespace_blk(dev))
1457 if (is_namespace_pmem(dev) || is_namespace_blk(dev)) {
1458 if (a == &dev_attr_size.attr)
1461 if (is_namespace_pmem(dev) && a == &dev_attr_sector_size.attr)
1467 if (a == &dev_attr_nstype.attr || a == &dev_attr_size.attr
1468 || a == &dev_attr_holder.attr
1469 || a == &dev_attr_force_raw.attr
1470 || a == &dev_attr_mode.attr)
1476 static struct attribute_group nd_namespace_attribute_group = {
1477 .attrs = nd_namespace_attributes,
1478 .is_visible = namespace_visible,
1481 static const struct attribute_group *nd_namespace_attribute_groups[] = {
1482 &nd_device_attribute_group,
1483 &nd_namespace_attribute_group,
1484 &nd_numa_attribute_group,
1488 struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev)
1490 struct nd_btt *nd_btt = is_nd_btt(dev) ? to_nd_btt(dev) : NULL;
1491 struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL;
1492 struct nd_dax *nd_dax = is_nd_dax(dev) ? to_nd_dax(dev) : NULL;
1493 struct nd_namespace_common *ndns = NULL;
1494 resource_size_t size;
1496 if (nd_btt || nd_pfn || nd_dax) {
1498 ndns = nd_btt->ndns;
1500 ndns = nd_pfn->ndns;
1502 ndns = nd_dax->nd_pfn.ndns;
1505 return ERR_PTR(-ENODEV);
1508 * Flush any in-progess probes / removals in the driver
1509 * for the raw personality of this namespace.
1511 device_lock(&ndns->dev);
1512 device_unlock(&ndns->dev);
1513 if (ndns->dev.driver) {
1514 dev_dbg(&ndns->dev, "is active, can't bind %s\n",
1516 return ERR_PTR(-EBUSY);
1518 if (dev_WARN_ONCE(&ndns->dev, ndns->claim != dev,
1519 "host (%s) vs claim (%s) mismatch\n",
1521 dev_name(ndns->claim)))
1522 return ERR_PTR(-ENXIO);
1524 ndns = to_ndns(dev);
1526 dev_dbg(dev, "claimed by %s, failing probe\n",
1527 dev_name(ndns->claim));
1529 return ERR_PTR(-ENXIO);
1533 size = nvdimm_namespace_capacity(ndns);
1534 if (size < ND_MIN_NAMESPACE_SIZE) {
1535 dev_dbg(&ndns->dev, "%pa, too small must be at least %#x\n",
1536 &size, ND_MIN_NAMESPACE_SIZE);
1537 return ERR_PTR(-ENODEV);
1540 if (is_namespace_pmem(&ndns->dev)) {
1541 struct nd_namespace_pmem *nspm;
1543 nspm = to_nd_namespace_pmem(&ndns->dev);
1544 if (uuid_not_set(nspm->uuid, &ndns->dev, __func__))
1545 return ERR_PTR(-ENODEV);
1546 } else if (is_namespace_blk(&ndns->dev)) {
1547 struct nd_namespace_blk *nsblk;
1549 nsblk = to_nd_namespace_blk(&ndns->dev);
1550 if (uuid_not_set(nsblk->uuid, &ndns->dev, __func__))
1551 return ERR_PTR(-ENODEV);
1552 if (!nsblk->lbasize) {
1553 dev_dbg(&ndns->dev, "%s: sector size not set\n",
1555 return ERR_PTR(-ENODEV);
1557 if (!nd_namespace_blk_validate(nsblk))
1558 return ERR_PTR(-ENODEV);
1563 EXPORT_SYMBOL(nvdimm_namespace_common_probe);
1565 static struct device **create_namespace_io(struct nd_region *nd_region)
1567 struct nd_namespace_io *nsio;
1568 struct device *dev, **devs;
1569 struct resource *res;
1571 nsio = kzalloc(sizeof(*nsio), GFP_KERNEL);
1575 devs = kcalloc(2, sizeof(struct device *), GFP_KERNEL);
1581 dev = &nsio->common.dev;
1582 dev->type = &namespace_io_device_type;
1583 dev->parent = &nd_region->dev;
1585 res->name = dev_name(&nd_region->dev);
1586 res->flags = IORESOURCE_MEM;
1587 res->start = nd_region->ndr_start;
1588 res->end = res->start + nd_region->ndr_size - 1;
1594 static bool has_uuid_at_pos(struct nd_region *nd_region, u8 *uuid,
1595 u64 cookie, u16 pos)
1597 struct nd_namespace_label *found = NULL;
1600 for (i = 0; i < nd_region->ndr_mappings; i++) {
1601 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1602 struct nd_label_ent *label_ent;
1603 bool found_uuid = false;
1605 list_for_each_entry(label_ent, &nd_mapping->labels, list) {
1606 struct nd_namespace_label *nd_label = label_ent->label;
1607 u16 position, nlabel;
1612 isetcookie = __le64_to_cpu(nd_label->isetcookie);
1613 position = __le16_to_cpu(nd_label->position);
1614 nlabel = __le16_to_cpu(nd_label->nlabel);
1616 if (isetcookie != cookie)
1619 if (memcmp(nd_label->uuid, uuid, NSLABEL_UUID_LEN) != 0)
1623 dev_dbg(to_ndd(nd_mapping)->dev,
1624 "%s duplicate entry for uuid\n",
1629 if (nlabel != nd_region->ndr_mappings)
1631 if (position != pos)
1639 return found != NULL;
1642 static int select_pmem_id(struct nd_region *nd_region, u8 *pmem_id)
1649 for (i = 0; i < nd_region->ndr_mappings; i++) {
1650 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1651 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1652 struct nd_namespace_label *nd_label = NULL;
1653 u64 hw_start, hw_end, pmem_start, pmem_end;
1654 struct nd_label_ent *label_ent;
1656 lockdep_assert_held(&nd_mapping->lock);
1657 list_for_each_entry(label_ent, &nd_mapping->labels, list) {
1658 nd_label = label_ent->label;
1661 if (memcmp(nd_label->uuid, pmem_id, NSLABEL_UUID_LEN) == 0)
1672 * Check that this label is compliant with the dpa
1673 * range published in NFIT
1675 hw_start = nd_mapping->start;
1676 hw_end = hw_start + nd_mapping->size;
1677 pmem_start = __le64_to_cpu(nd_label->dpa);
1678 pmem_end = pmem_start + __le64_to_cpu(nd_label->rawsize);
1679 if (pmem_start >= hw_start && pmem_start < hw_end
1680 && pmem_end <= hw_end && pmem_end > hw_start)
1683 dev_dbg(&nd_region->dev, "%s invalid label for %pUb\n",
1684 dev_name(ndd->dev), nd_label->uuid);
1688 /* move recently validated label to the front of the list */
1689 list_move(&label_ent->list, &nd_mapping->labels);
1695 * create_namespace_pmem - validate interleave set labelling, retrieve label0
1696 * @nd_region: region with mappings to validate
1697 * @nspm: target namespace to create
1698 * @nd_label: target pmem namespace label to evaluate
1700 struct device *create_namespace_pmem(struct nd_region *nd_region,
1701 struct nd_namespace_label *nd_label)
1703 u64 cookie = nd_region_interleave_set_cookie(nd_region);
1704 struct nd_label_ent *label_ent;
1705 struct nd_namespace_pmem *nspm;
1706 struct nd_mapping *nd_mapping;
1707 resource_size_t size = 0;
1708 struct resource *res;
1714 dev_dbg(&nd_region->dev, "invalid interleave-set-cookie\n");
1715 return ERR_PTR(-ENXIO);
1718 if (__le64_to_cpu(nd_label->isetcookie) != cookie) {
1719 dev_dbg(&nd_region->dev, "invalid cookie in label: %pUb\n",
1721 return ERR_PTR(-EAGAIN);
1724 nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
1726 return ERR_PTR(-ENOMEM);
1729 dev = &nspm->nsio.common.dev;
1730 dev->type = &namespace_pmem_device_type;
1731 dev->parent = &nd_region->dev;
1732 res = &nspm->nsio.res;
1733 res->name = dev_name(&nd_region->dev);
1734 res->flags = IORESOURCE_MEM;
1736 for (i = 0; i < nd_region->ndr_mappings; i++)
1737 if (!has_uuid_at_pos(nd_region, nd_label->uuid, cookie, i))
1739 if (i < nd_region->ndr_mappings) {
1740 struct nvdimm_drvdata *ndd = to_ndd(&nd_region->mapping[i]);
1743 * Give up if we don't find an instance of a uuid at each
1744 * position (from 0 to nd_region->ndr_mappings - 1), or if we
1745 * find a dimm with two instances of the same uuid.
1747 dev_err(&nd_region->dev, "%s missing label for %pUb\n",
1748 dev_name(ndd->dev), nd_label->uuid);
1754 * Fix up each mapping's 'labels' to have the validated pmem label for
1755 * that position at labels[0], and NULL at labels[1]. In the process,
1756 * check that the namespace aligns with interleave-set. We know
1757 * that it does not overlap with any blk namespaces by virtue of
1758 * the dimm being enabled (i.e. nd_label_reserve_dpa()
1761 rc = select_pmem_id(nd_region, nd_label->uuid);
1765 /* Calculate total size and populate namespace properties from label0 */
1766 for (i = 0; i < nd_region->ndr_mappings; i++) {
1767 struct nd_namespace_label *label0;
1769 nd_mapping = &nd_region->mapping[i];
1770 label_ent = list_first_entry_or_null(&nd_mapping->labels,
1771 typeof(*label_ent), list);
1772 label0 = label_ent ? label_ent->label : 0;
1779 size += __le64_to_cpu(label0->rawsize);
1780 if (__le16_to_cpu(label0->position) != 0)
1782 WARN_ON(nspm->alt_name || nspm->uuid);
1783 nspm->alt_name = kmemdup((void __force *) label0->name,
1784 NSLABEL_NAME_LEN, GFP_KERNEL);
1785 nspm->uuid = kmemdup((void __force *) label0->uuid,
1786 NSLABEL_UUID_LEN, GFP_KERNEL);
1789 if (!nspm->alt_name || !nspm->uuid) {
1794 nd_namespace_pmem_set_resource(nd_region, nspm, size);
1798 namespace_pmem_release(dev);
1801 dev_dbg(&nd_region->dev, "%s: invalid label(s)\n", __func__);
1804 dev_dbg(&nd_region->dev, "%s: label not found\n", __func__);
1807 dev_dbg(&nd_region->dev, "%s: unexpected err: %d\n",
1814 struct resource *nsblk_add_resource(struct nd_region *nd_region,
1815 struct nvdimm_drvdata *ndd, struct nd_namespace_blk *nsblk,
1816 resource_size_t start)
1818 struct nd_label_id label_id;
1819 struct resource *res;
1821 nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
1822 res = krealloc(nsblk->res,
1823 sizeof(void *) * (nsblk->num_resources + 1),
1827 nsblk->res = (struct resource **) res;
1828 for_each_dpa_resource(ndd, res)
1829 if (strcmp(res->name, label_id.id) == 0
1830 && res->start == start) {
1831 nsblk->res[nsblk->num_resources++] = res;
1837 static struct device *nd_namespace_blk_create(struct nd_region *nd_region)
1839 struct nd_namespace_blk *nsblk;
1842 if (!is_nd_blk(&nd_region->dev))
1845 nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
1849 dev = &nsblk->common.dev;
1850 dev->type = &namespace_blk_device_type;
1851 nsblk->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL);
1852 if (nsblk->id < 0) {
1856 dev_set_name(dev, "namespace%d.%d", nd_region->id, nsblk->id);
1857 dev->parent = &nd_region->dev;
1858 dev->groups = nd_namespace_attribute_groups;
1860 return &nsblk->common.dev;
1863 static struct device *nd_namespace_pmem_create(struct nd_region *nd_region)
1865 struct nd_namespace_pmem *nspm;
1866 struct resource *res;
1869 if (!is_nd_pmem(&nd_region->dev))
1872 nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
1876 dev = &nspm->nsio.common.dev;
1877 dev->type = &namespace_pmem_device_type;
1878 dev->parent = &nd_region->dev;
1879 res = &nspm->nsio.res;
1880 res->name = dev_name(&nd_region->dev);
1881 res->flags = IORESOURCE_MEM;
1883 nspm->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL);
1888 dev_set_name(dev, "namespace%d.%d", nd_region->id, nspm->id);
1889 dev->parent = &nd_region->dev;
1890 dev->groups = nd_namespace_attribute_groups;
1891 nd_namespace_pmem_set_resource(nd_region, nspm, 0);
1896 void nd_region_create_ns_seed(struct nd_region *nd_region)
1898 WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
1900 if (nd_region_to_nstype(nd_region) == ND_DEVICE_NAMESPACE_IO)
1903 if (is_nd_blk(&nd_region->dev))
1904 nd_region->ns_seed = nd_namespace_blk_create(nd_region);
1906 nd_region->ns_seed = nd_namespace_pmem_create(nd_region);
1909 * Seed creation failures are not fatal, provisioning is simply
1910 * disabled until memory becomes available
1912 if (!nd_region->ns_seed)
1913 dev_err(&nd_region->dev, "failed to create %s namespace\n",
1914 is_nd_blk(&nd_region->dev) ? "blk" : "pmem");
1916 nd_device_register(nd_region->ns_seed);
1919 void nd_region_create_dax_seed(struct nd_region *nd_region)
1921 WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
1922 nd_region->dax_seed = nd_dax_create(nd_region);
1924 * Seed creation failures are not fatal, provisioning is simply
1925 * disabled until memory becomes available
1927 if (!nd_region->dax_seed)
1928 dev_err(&nd_region->dev, "failed to create dax namespace\n");
1931 void nd_region_create_pfn_seed(struct nd_region *nd_region)
1933 WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
1934 nd_region->pfn_seed = nd_pfn_create(nd_region);
1936 * Seed creation failures are not fatal, provisioning is simply
1937 * disabled until memory becomes available
1939 if (!nd_region->pfn_seed)
1940 dev_err(&nd_region->dev, "failed to create pfn namespace\n");
1943 void nd_region_create_btt_seed(struct nd_region *nd_region)
1945 WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
1946 nd_region->btt_seed = nd_btt_create(nd_region);
1948 * Seed creation failures are not fatal, provisioning is simply
1949 * disabled until memory becomes available
1951 if (!nd_region->btt_seed)
1952 dev_err(&nd_region->dev, "failed to create btt namespace\n");
1955 static int add_namespace_resource(struct nd_region *nd_region,
1956 struct nd_namespace_label *nd_label, struct device **devs,
1959 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
1960 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1963 for (i = 0; i < count; i++) {
1964 u8 *uuid = namespace_to_uuid(devs[i]);
1965 struct resource *res;
1967 if (IS_ERR_OR_NULL(uuid)) {
1972 if (memcmp(uuid, nd_label->uuid, NSLABEL_UUID_LEN) != 0)
1974 if (is_namespace_blk(devs[i])) {
1975 res = nsblk_add_resource(nd_region, ndd,
1976 to_nd_namespace_blk(devs[i]),
1977 __le64_to_cpu(nd_label->dpa));
1980 nd_dbg_dpa(nd_region, ndd, res, "%d assign\n", count);
1982 dev_err(&nd_region->dev,
1983 "error: conflicting extents for uuid: %pUb\n",
1993 struct device *create_namespace_blk(struct nd_region *nd_region,
1994 struct nd_namespace_label *nd_label, int count)
1997 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
1998 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1999 struct nd_namespace_blk *nsblk;
2000 char name[NSLABEL_NAME_LEN];
2001 struct device *dev = NULL;
2002 struct resource *res;
2004 nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
2006 return ERR_PTR(-ENOMEM);
2007 dev = &nsblk->common.dev;
2008 dev->type = &namespace_blk_device_type;
2009 dev->parent = &nd_region->dev;
2011 nsblk->lbasize = __le64_to_cpu(nd_label->lbasize);
2012 nsblk->uuid = kmemdup(nd_label->uuid, NSLABEL_UUID_LEN,
2016 memcpy(name, nd_label->name, NSLABEL_NAME_LEN);
2018 nsblk->alt_name = kmemdup(name, NSLABEL_NAME_LEN,
2020 res = nsblk_add_resource(nd_region, ndd, nsblk,
2021 __le64_to_cpu(nd_label->dpa));
2024 nd_dbg_dpa(nd_region, ndd, res, "%d: assign\n", count);
2027 namespace_blk_release(dev);
2028 return ERR_PTR(-ENXIO);
2031 static int cmp_dpa(const void *a, const void *b)
2033 const struct device *dev_a = *(const struct device **) a;
2034 const struct device *dev_b = *(const struct device **) b;
2035 struct nd_namespace_blk *nsblk_a, *nsblk_b;
2036 struct nd_namespace_pmem *nspm_a, *nspm_b;
2038 if (is_namespace_io(dev_a))
2041 if (is_namespace_blk(dev_a)) {
2042 nsblk_a = to_nd_namespace_blk(dev_a);
2043 nsblk_b = to_nd_namespace_blk(dev_b);
2045 return memcmp(&nsblk_a->res[0]->start, &nsblk_b->res[0]->start,
2046 sizeof(resource_size_t));
2049 nspm_a = to_nd_namespace_pmem(dev_a);
2050 nspm_b = to_nd_namespace_pmem(dev_b);
2052 return memcmp(&nspm_a->nsio.res.start, &nspm_b->nsio.res.start,
2053 sizeof(resource_size_t));
2056 static struct device **scan_labels(struct nd_region *nd_region)
2059 struct device *dev, **devs = NULL;
2060 struct nd_label_ent *label_ent, *e;
2061 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2062 resource_size_t map_end = nd_mapping->start + nd_mapping->size - 1;
2064 /* "safe" because create_namespace_pmem() might list_move() label_ent */
2065 list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) {
2066 struct nd_namespace_label *nd_label = label_ent->label;
2067 struct device **__devs;
2072 flags = __le32_to_cpu(nd_label->flags);
2073 if (is_nd_blk(&nd_region->dev)
2074 == !!(flags & NSLABEL_FLAG_LOCAL))
2075 /* pass, region matches label type */;
2079 /* skip labels that describe extents outside of the region */
2080 if (nd_label->dpa < nd_mapping->start || nd_label->dpa > map_end)
2083 i = add_namespace_resource(nd_region, nd_label, devs, count);
2088 __devs = kcalloc(count + 2, sizeof(dev), GFP_KERNEL);
2091 memcpy(__devs, devs, sizeof(dev) * count);
2095 if (is_nd_blk(&nd_region->dev)) {
2096 dev = create_namespace_blk(nd_region, nd_label, count);
2099 devs[count++] = dev;
2101 dev = create_namespace_pmem(nd_region, nd_label);
2103 switch (PTR_ERR(dev)) {
2105 /* skip invalid labels */
2108 /* fallthrough to seed creation */
2114 devs[count++] = dev;
2118 dev_dbg(&nd_region->dev, "%s: discovered %d %s namespace%s\n",
2119 __func__, count, is_nd_blk(&nd_region->dev)
2120 ? "blk" : "pmem", count == 1 ? "" : "s");
2123 /* Publish a zero-sized namespace for userspace to configure. */
2124 nd_mapping_free_labels(nd_mapping);
2126 devs = kcalloc(2, sizeof(dev), GFP_KERNEL);
2129 if (is_nd_blk(&nd_region->dev)) {
2130 struct nd_namespace_blk *nsblk;
2132 nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
2135 dev = &nsblk->common.dev;
2136 dev->type = &namespace_blk_device_type;
2138 struct nd_namespace_pmem *nspm;
2140 nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
2143 dev = &nspm->nsio.common.dev;
2144 dev->type = &namespace_pmem_device_type;
2145 nd_namespace_pmem_set_resource(nd_region, nspm, 0);
2147 dev->parent = &nd_region->dev;
2148 devs[count++] = dev;
2149 } else if (is_nd_pmem(&nd_region->dev)) {
2150 /* clean unselected labels */
2151 for (i = 0; i < nd_region->ndr_mappings; i++) {
2152 struct list_head *l, *e;
2156 nd_mapping = &nd_region->mapping[i];
2157 if (list_empty(&nd_mapping->labels)) {
2163 list_for_each_safe(l, e, &nd_mapping->labels) {
2166 list_move_tail(l, &list);
2168 nd_mapping_free_labels(nd_mapping);
2169 list_splice_init(&list, &nd_mapping->labels);
2174 sort(devs, count, sizeof(struct device *), cmp_dpa, NULL);
2180 for (i = 0; devs[i]; i++)
2181 if (is_nd_blk(&nd_region->dev))
2182 namespace_blk_release(devs[i]);
2184 namespace_pmem_release(devs[i]);
2190 static struct device **create_namespaces(struct nd_region *nd_region)
2192 struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2193 struct device **devs;
2196 if (nd_region->ndr_mappings == 0)
2199 /* lock down all mappings while we scan labels */
2200 for (i = 0; i < nd_region->ndr_mappings; i++) {
2201 nd_mapping = &nd_region->mapping[i];
2202 mutex_lock_nested(&nd_mapping->lock, i);
2205 devs = scan_labels(nd_region);
2207 for (i = 0; i < nd_region->ndr_mappings; i++) {
2208 int reverse = nd_region->ndr_mappings - 1 - i;
2210 nd_mapping = &nd_region->mapping[reverse];
2211 mutex_unlock(&nd_mapping->lock);
2217 static int init_active_labels(struct nd_region *nd_region)
2221 for (i = 0; i < nd_region->ndr_mappings; i++) {
2222 struct nd_mapping *nd_mapping = &nd_region->mapping[i];
2223 struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2224 struct nvdimm *nvdimm = nd_mapping->nvdimm;
2225 struct nd_label_ent *label_ent;
2229 * If the dimm is disabled then prevent the region from
2230 * being activated if it aliases DPA.
2233 if ((nvdimm->flags & NDD_ALIASING) == 0)
2235 dev_dbg(&nd_region->dev, "%s: is disabled, failing probe\n",
2236 dev_name(&nd_mapping->nvdimm->dev));
2239 nd_mapping->ndd = ndd;
2240 atomic_inc(&nvdimm->busy);
2243 count = nd_label_active_count(ndd);
2244 dev_dbg(ndd->dev, "%s: %d\n", __func__, count);
2247 for (j = 0; j < count; j++) {
2248 struct nd_namespace_label *label;
2250 label_ent = kzalloc(sizeof(*label_ent), GFP_KERNEL);
2253 label = nd_label_active(ndd, j);
2254 label_ent->label = label;
2256 mutex_lock(&nd_mapping->lock);
2257 list_add_tail(&label_ent->list, &nd_mapping->labels);
2258 mutex_unlock(&nd_mapping->lock);
2264 mutex_lock(&nd_mapping->lock);
2265 nd_mapping_free_labels(nd_mapping);
2266 mutex_unlock(&nd_mapping->lock);
2273 int nd_region_register_namespaces(struct nd_region *nd_region, int *err)
2275 struct device **devs = NULL;
2276 int i, rc = 0, type;
2279 nvdimm_bus_lock(&nd_region->dev);
2280 rc = init_active_labels(nd_region);
2282 nvdimm_bus_unlock(&nd_region->dev);
2286 type = nd_region_to_nstype(nd_region);
2288 case ND_DEVICE_NAMESPACE_IO:
2289 devs = create_namespace_io(nd_region);
2291 case ND_DEVICE_NAMESPACE_PMEM:
2292 case ND_DEVICE_NAMESPACE_BLK:
2293 devs = create_namespaces(nd_region);
2298 nvdimm_bus_unlock(&nd_region->dev);
2303 for (i = 0; devs[i]; i++) {
2304 struct device *dev = devs[i];
2307 if (type == ND_DEVICE_NAMESPACE_BLK) {
2308 struct nd_namespace_blk *nsblk;
2310 nsblk = to_nd_namespace_blk(dev);
2311 id = ida_simple_get(&nd_region->ns_ida, 0, 0,
2314 } else if (type == ND_DEVICE_NAMESPACE_PMEM) {
2315 struct nd_namespace_pmem *nspm;
2317 nspm = to_nd_namespace_pmem(dev);
2318 id = ida_simple_get(&nd_region->ns_ida, 0, 0,
2326 dev_set_name(dev, "namespace%d.%d", nd_region->id, id);
2327 dev->groups = nd_namespace_attribute_groups;
2328 nd_device_register(dev);
2331 nd_region->ns_seed = devs[0];
2336 for (j = i; devs[j]; j++) {
2337 struct device *dev = devs[j];
2339 device_initialize(dev);
2344 * All of the namespaces we tried to register failed, so
2345 * fail region activation.