1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
 
 
 
 
 
 
 
 
 
   4 */
   5#include <linux/module.h>
   6#include <linux/device.h>
   7#include <linux/sort.h>
   8#include <linux/slab.h>
   9#include <linux/list.h>
  10#include <linux/nd.h>
  11#include "nd-core.h"
  12#include "pmem.h"
  13#include "pfn.h"
  14#include "nd.h"
  15
  16static void namespace_io_release(struct device *dev)
  17{
  18	struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
  19
  20	kfree(nsio);
  21}
  22
  23static void namespace_pmem_release(struct device *dev)
  24{
  25	struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
  26	struct nd_region *nd_region = to_nd_region(dev->parent);
  27
  28	if (nspm->id >= 0)
  29		ida_simple_remove(&nd_region->ns_ida, nspm->id);
  30	kfree(nspm->alt_name);
  31	kfree(nspm->uuid);
  32	kfree(nspm);
  33}
  34
  35static void namespace_blk_release(struct device *dev)
  36{
  37	struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
  38	struct nd_region *nd_region = to_nd_region(dev->parent);
  39
  40	if (nsblk->id >= 0)
  41		ida_simple_remove(&nd_region->ns_ida, nsblk->id);
  42	kfree(nsblk->alt_name);
  43	kfree(nsblk->uuid);
  44	kfree(nsblk->res);
  45	kfree(nsblk);
  46}
  47
  48static bool is_namespace_pmem(const struct device *dev);
  49static bool is_namespace_blk(const struct device *dev);
  50static bool is_namespace_io(const struct device *dev);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  51
  52static int is_uuid_busy(struct device *dev, void *data)
  53{
  54	u8 *uuid1 = data, *uuid2 = NULL;
  55
  56	if (is_namespace_pmem(dev)) {
  57		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
  58
  59		uuid2 = nspm->uuid;
  60	} else if (is_namespace_blk(dev)) {
  61		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
  62
  63		uuid2 = nsblk->uuid;
  64	} else if (is_nd_btt(dev)) {
  65		struct nd_btt *nd_btt = to_nd_btt(dev);
  66
  67		uuid2 = nd_btt->uuid;
  68	} else if (is_nd_pfn(dev)) {
  69		struct nd_pfn *nd_pfn = to_nd_pfn(dev);
  70
  71		uuid2 = nd_pfn->uuid;
  72	}
  73
  74	if (uuid2 && memcmp(uuid1, uuid2, NSLABEL_UUID_LEN) == 0)
  75		return -EBUSY;
  76
  77	return 0;
  78}
  79
  80static int is_namespace_uuid_busy(struct device *dev, void *data)
  81{
  82	if (is_nd_region(dev))
  83		return device_for_each_child(dev, data, is_uuid_busy);
  84	return 0;
  85}
  86
  87/**
  88 * nd_is_uuid_unique - verify that no other namespace has @uuid
  89 * @dev: any device on a nvdimm_bus
  90 * @uuid: uuid to check
  91 */
  92bool nd_is_uuid_unique(struct device *dev, u8 *uuid)
  93{
  94	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
  95
  96	if (!nvdimm_bus)
  97		return false;
  98	WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm_bus->dev));
  99	if (device_for_each_child(&nvdimm_bus->dev, uuid,
 100				is_namespace_uuid_busy) != 0)
 101		return false;
 102	return true;
 103}
 104
 105bool pmem_should_map_pages(struct device *dev)
 106{
 107	struct nd_region *nd_region = to_nd_region(dev->parent);
 108	struct nd_namespace_common *ndns = to_ndns(dev);
 109	struct nd_namespace_io *nsio;
 110
 111	if (!IS_ENABLED(CONFIG_ZONE_DEVICE))
 112		return false;
 113
 114	if (!test_bit(ND_REGION_PAGEMAP, &nd_region->flags))
 115		return false;
 116
 117	if (is_nd_pfn(dev) || is_nd_btt(dev))
 118		return false;
 119
 120	if (ndns->force_raw)
 121		return false;
 122
 123	nsio = to_nd_namespace_io(dev);
 124	if (region_intersects(nsio->res.start, resource_size(&nsio->res),
 125				IORESOURCE_SYSTEM_RAM,
 126				IORES_DESC_NONE) == REGION_MIXED)
 127		return false;
 128
 129	return ARCH_MEMREMAP_PMEM == MEMREMAP_WB;
 130}
 131EXPORT_SYMBOL(pmem_should_map_pages);
 132
 133unsigned int pmem_sector_size(struct nd_namespace_common *ndns)
 134{
 135	if (is_namespace_pmem(&ndns->dev)) {
 136		struct nd_namespace_pmem *nspm;
 137
 138		nspm = to_nd_namespace_pmem(&ndns->dev);
 139		if (nspm->lbasize == 0 || nspm->lbasize == 512)
 140			/* default */;
 141		else if (nspm->lbasize == 4096)
 142			return 4096;
 143		else
 144			dev_WARN(&ndns->dev, "unsupported sector size: %ld\n",
 145					nspm->lbasize);
 146	}
 147
 148	/*
 149	 * There is no namespace label (is_namespace_io()), or the label
 150	 * indicates the default sector size.
 151	 */
 152	return 512;
 153}
 154EXPORT_SYMBOL(pmem_sector_size);
 155
 156const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
 157		char *name)
 158{
 159	struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
 160	const char *suffix = NULL;
 161
 162	if (ndns->claim && is_nd_btt(ndns->claim))
 163		suffix = "s";
 164
 165	if (is_namespace_pmem(&ndns->dev) || is_namespace_io(&ndns->dev)) {
 166		int nsidx = 0;
 167
 168		if (is_namespace_pmem(&ndns->dev)) {
 169			struct nd_namespace_pmem *nspm;
 170
 171			nspm = to_nd_namespace_pmem(&ndns->dev);
 172			nsidx = nspm->id;
 173		}
 174
 175		if (nsidx)
 176			sprintf(name, "pmem%d.%d%s", nd_region->id, nsidx,
 177					suffix ? suffix : "");
 178		else
 179			sprintf(name, "pmem%d%s", nd_region->id,
 180					suffix ? suffix : "");
 181	} else if (is_namespace_blk(&ndns->dev)) {
 182		struct nd_namespace_blk *nsblk;
 183
 184		nsblk = to_nd_namespace_blk(&ndns->dev);
 185		sprintf(name, "ndblk%d.%d%s", nd_region->id, nsblk->id,
 186				suffix ? suffix : "");
 187	} else {
 188		return NULL;
 189	}
 190
 191	return name;
 192}
 193EXPORT_SYMBOL(nvdimm_namespace_disk_name);
 194
 195const u8 *nd_dev_to_uuid(struct device *dev)
 196{
 197	static const u8 null_uuid[16];
 198
 199	if (!dev)
 200		return null_uuid;
 201
 202	if (is_namespace_pmem(dev)) {
 203		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
 204
 205		return nspm->uuid;
 206	} else if (is_namespace_blk(dev)) {
 207		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 208
 209		return nsblk->uuid;
 210	} else
 211		return null_uuid;
 212}
 213EXPORT_SYMBOL(nd_dev_to_uuid);
 214
 215static ssize_t nstype_show(struct device *dev,
 216		struct device_attribute *attr, char *buf)
 217{
 218	struct nd_region *nd_region = to_nd_region(dev->parent);
 219
 220	return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region));
 221}
 222static DEVICE_ATTR_RO(nstype);
 223
 224static ssize_t __alt_name_store(struct device *dev, const char *buf,
 225		const size_t len)
 226{
 227	char *input, *pos, *alt_name, **ns_altname;
 228	ssize_t rc;
 229
 230	if (is_namespace_pmem(dev)) {
 231		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
 232
 233		ns_altname = &nspm->alt_name;
 234	} else if (is_namespace_blk(dev)) {
 235		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 236
 237		ns_altname = &nsblk->alt_name;
 238	} else
 239		return -ENXIO;
 240
 241	if (dev->driver || to_ndns(dev)->claim)
 242		return -EBUSY;
 243
 244	input = kstrndup(buf, len, GFP_KERNEL);
 245	if (!input)
 246		return -ENOMEM;
 247
 
 248	pos = strim(input);
 249	if (strlen(pos) + 1 > NSLABEL_NAME_LEN) {
 250		rc = -EINVAL;
 251		goto out;
 252	}
 253
 254	alt_name = kzalloc(NSLABEL_NAME_LEN, GFP_KERNEL);
 255	if (!alt_name) {
 256		rc = -ENOMEM;
 257		goto out;
 258	}
 259	kfree(*ns_altname);
 260	*ns_altname = alt_name;
 261	sprintf(*ns_altname, "%s", pos);
 262	rc = len;
 263
 264out:
 265	kfree(input);
 266	return rc;
 267}
 268
 269static resource_size_t nd_namespace_blk_size(struct nd_namespace_blk *nsblk)
 270{
 271	struct nd_region *nd_region = to_nd_region(nsblk->common.dev.parent);
 272	struct nd_mapping *nd_mapping = &nd_region->mapping[0];
 273	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 274	struct nd_label_id label_id;
 275	resource_size_t size = 0;
 276	struct resource *res;
 277
 278	if (!nsblk->uuid)
 279		return 0;
 280	nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
 281	for_each_dpa_resource(ndd, res)
 282		if (strcmp(res->name, label_id.id) == 0)
 283			size += resource_size(res);
 284	return size;
 285}
 286
 287static bool __nd_namespace_blk_validate(struct nd_namespace_blk *nsblk)
 288{
 289	struct nd_region *nd_region = to_nd_region(nsblk->common.dev.parent);
 290	struct nd_mapping *nd_mapping = &nd_region->mapping[0];
 291	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 292	struct nd_label_id label_id;
 293	struct resource *res;
 294	int count, i;
 295
 296	if (!nsblk->uuid || !nsblk->lbasize || !ndd)
 297		return false;
 298
 299	count = 0;
 300	nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
 301	for_each_dpa_resource(ndd, res) {
 302		if (strcmp(res->name, label_id.id) != 0)
 303			continue;
 304		/*
 305		 * Resources with unacknowledged adjustments indicate a
 306		 * failure to update labels
 307		 */
 308		if (res->flags & DPA_RESOURCE_ADJUSTED)
 309			return false;
 310		count++;
 311	}
 312
 313	/* These values match after a successful label update */
 314	if (count != nsblk->num_resources)
 315		return false;
 316
 317	for (i = 0; i < nsblk->num_resources; i++) {
 318		struct resource *found = NULL;
 319
 320		for_each_dpa_resource(ndd, res)
 321			if (res == nsblk->res[i]) {
 322				found = res;
 323				break;
 324			}
 325		/* stale resource */
 326		if (!found)
 327			return false;
 328	}
 329
 330	return true;
 331}
 332
 333resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk)
 334{
 335	resource_size_t size;
 336
 337	nvdimm_bus_lock(&nsblk->common.dev);
 338	size = __nd_namespace_blk_validate(nsblk);
 339	nvdimm_bus_unlock(&nsblk->common.dev);
 340
 341	return size;
 342}
 343EXPORT_SYMBOL(nd_namespace_blk_validate);
 344
 345
 346static int nd_namespace_label_update(struct nd_region *nd_region,
 347		struct device *dev)
 348{
 349	dev_WARN_ONCE(dev, dev->driver || to_ndns(dev)->claim,
 350			"namespace must be idle during label update\n");
 351	if (dev->driver || to_ndns(dev)->claim)
 352		return 0;
 353
 354	/*
 355	 * Only allow label writes that will result in a valid namespace
 356	 * or deletion of an existing namespace.
 357	 */
 358	if (is_namespace_pmem(dev)) {
 359		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
 360		resource_size_t size = resource_size(&nspm->nsio.res);
 361
 362		if (size == 0 && nspm->uuid)
 363			/* delete allocation */;
 364		else if (!nspm->uuid)
 365			return 0;
 366
 367		return nd_pmem_namespace_label_update(nd_region, nspm, size);
 368	} else if (is_namespace_blk(dev)) {
 369		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 370		resource_size_t size = nd_namespace_blk_size(nsblk);
 371
 372		if (size == 0 && nsblk->uuid)
 373			/* delete allocation */;
 374		else if (!nsblk->uuid || !nsblk->lbasize)
 375			return 0;
 376
 377		return nd_blk_namespace_label_update(nd_region, nsblk, size);
 378	} else
 379		return -ENXIO;
 380}
 381
 382static ssize_t alt_name_store(struct device *dev,
 383		struct device_attribute *attr, const char *buf, size_t len)
 384{
 385	struct nd_region *nd_region = to_nd_region(dev->parent);
 386	ssize_t rc;
 387
 388	nd_device_lock(dev);
 389	nvdimm_bus_lock(dev);
 390	wait_nvdimm_bus_probe_idle(dev);
 391	rc = __alt_name_store(dev, buf, len);
 392	if (rc >= 0)
 393		rc = nd_namespace_label_update(nd_region, dev);
 394	dev_dbg(dev, "%s(%zd)\n", rc < 0 ? "fail " : "", rc);
 395	nvdimm_bus_unlock(dev);
 396	nd_device_unlock(dev);
 397
 398	return rc < 0 ? rc : len;
 399}
 400
 401static ssize_t alt_name_show(struct device *dev,
 402		struct device_attribute *attr, char *buf)
 403{
 404	char *ns_altname;
 405
 406	if (is_namespace_pmem(dev)) {
 407		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
 408
 409		ns_altname = nspm->alt_name;
 410	} else if (is_namespace_blk(dev)) {
 411		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 412
 413		ns_altname = nsblk->alt_name;
 414	} else
 415		return -ENXIO;
 416
 417	return sprintf(buf, "%s\n", ns_altname ? ns_altname : "");
 418}
 419static DEVICE_ATTR_RW(alt_name);
 420
 421static int scan_free(struct nd_region *nd_region,
 422		struct nd_mapping *nd_mapping, struct nd_label_id *label_id,
 423		resource_size_t n)
 424{
 425	bool is_blk = strncmp(label_id->id, "blk", 3) == 0;
 426	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 427	int rc = 0;
 428
 429	while (n) {
 430		struct resource *res, *last;
 431		resource_size_t new_start;
 432
 433		last = NULL;
 434		for_each_dpa_resource(ndd, res)
 435			if (strcmp(res->name, label_id->id) == 0)
 436				last = res;
 437		res = last;
 438		if (!res)
 439			return 0;
 440
 441		if (n >= resource_size(res)) {
 442			n -= resource_size(res);
 443			nd_dbg_dpa(nd_region, ndd, res, "delete %d\n", rc);
 444			nvdimm_free_dpa(ndd, res);
 445			/* retry with last resource deleted */
 446			continue;
 447		}
 448
 449		/*
 450		 * Keep BLK allocations relegated to high DPA as much as
 451		 * possible
 452		 */
 453		if (is_blk)
 454			new_start = res->start + n;
 455		else
 456			new_start = res->start;
 457
 458		rc = adjust_resource(res, new_start, resource_size(res) - n);
 459		if (rc == 0)
 460			res->flags |= DPA_RESOURCE_ADJUSTED;
 461		nd_dbg_dpa(nd_region, ndd, res, "shrink %d\n", rc);
 462		break;
 463	}
 464
 465	return rc;
 466}
 467
 468/**
 469 * shrink_dpa_allocation - for each dimm in region free n bytes for label_id
 470 * @nd_region: the set of dimms to reclaim @n bytes from
 471 * @label_id: unique identifier for the namespace consuming this dpa range
 472 * @n: number of bytes per-dimm to release
 473 *
 474 * Assumes resources are ordered.  Starting from the end try to
 475 * adjust_resource() the allocation to @n, but if @n is larger than the
 476 * allocation delete it and find the 'new' last allocation in the label
 477 * set.
 478 */
 479static int shrink_dpa_allocation(struct nd_region *nd_region,
 480		struct nd_label_id *label_id, resource_size_t n)
 481{
 482	int i;
 483
 484	for (i = 0; i < nd_region->ndr_mappings; i++) {
 485		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
 486		int rc;
 487
 488		rc = scan_free(nd_region, nd_mapping, label_id, n);
 489		if (rc)
 490			return rc;
 491	}
 492
 493	return 0;
 494}
 495
 496static resource_size_t init_dpa_allocation(struct nd_label_id *label_id,
 497		struct nd_region *nd_region, struct nd_mapping *nd_mapping,
 498		resource_size_t n)
 499{
 500	bool is_blk = strncmp(label_id->id, "blk", 3) == 0;
 501	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 502	resource_size_t first_dpa;
 503	struct resource *res;
 504	int rc = 0;
 505
 506	/* allocate blk from highest dpa first */
 507	if (is_blk)
 508		first_dpa = nd_mapping->start + nd_mapping->size - n;
 509	else
 510		first_dpa = nd_mapping->start;
 511
 512	/* first resource allocation for this label-id or dimm */
 513	res = nvdimm_allocate_dpa(ndd, label_id, first_dpa, n);
 514	if (!res)
 515		rc = -EBUSY;
 516
 517	nd_dbg_dpa(nd_region, ndd, res, "init %d\n", rc);
 518	return rc ? n : 0;
 519}
 520
 521
 522/**
 523 * space_valid() - validate free dpa space against constraints
 524 * @nd_region: hosting region of the free space
 525 * @ndd: dimm device data for debug
 526 * @label_id: namespace id to allocate space
 527 * @prev: potential allocation that precedes free space
 528 * @next: allocation that follows the given free space range
 529 * @exist: first allocation with same id in the mapping
 530 * @n: range that must satisfied for pmem allocations
 531 * @valid: free space range to validate
 532 *
 533 * BLK-space is valid as long as it does not precede a PMEM
 534 * allocation in a given region. PMEM-space must be contiguous
 535 * and adjacent to an existing existing allocation (if one
 536 * exists).  If reserving PMEM any space is valid.
 537 */
 538static void space_valid(struct nd_region *nd_region, struct nvdimm_drvdata *ndd,
 539		struct nd_label_id *label_id, struct resource *prev,
 540		struct resource *next, struct resource *exist,
 541		resource_size_t n, struct resource *valid)
 542{
 543	bool is_reserve = strcmp(label_id->id, "pmem-reserve") == 0;
 544	bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
 545	unsigned long align;
 546
 547	align = nd_region->align / nd_region->ndr_mappings;
 548	valid->start = ALIGN(valid->start, align);
 549	valid->end = ALIGN_DOWN(valid->end + 1, align) - 1;
 550
 551	if (valid->start >= valid->end)
 552		goto invalid;
 553
 554	if (is_reserve)
 555		return;
 556
 557	if (!is_pmem) {
 558		struct nd_mapping *nd_mapping = &nd_region->mapping[0];
 559		struct nvdimm_bus *nvdimm_bus;
 560		struct blk_alloc_info info = {
 561			.nd_mapping = nd_mapping,
 562			.available = nd_mapping->size,
 563			.res = valid,
 564		};
 565
 566		WARN_ON(!is_nd_blk(&nd_region->dev));
 567		nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
 568		device_for_each_child(&nvdimm_bus->dev, &info, alias_dpa_busy);
 569		return;
 570	}
 571
 572	/* allocation needs to be contiguous, so this is all or nothing */
 573	if (resource_size(valid) < n)
 574		goto invalid;
 575
 576	/* we've got all the space we need and no existing allocation */
 577	if (!exist)
 578		return;
 579
 580	/* allocation needs to be contiguous with the existing namespace */
 581	if (valid->start == exist->end + 1
 582			|| valid->end == exist->start - 1)
 583		return;
 584
 585 invalid:
 586	/* truncate @valid size to 0 */
 587	valid->end = valid->start - 1;
 588}
 589
 590enum alloc_loc {
 591	ALLOC_ERR = 0, ALLOC_BEFORE, ALLOC_MID, ALLOC_AFTER,
 592};
 593
 594static resource_size_t scan_allocate(struct nd_region *nd_region,
 595		struct nd_mapping *nd_mapping, struct nd_label_id *label_id,
 596		resource_size_t n)
 597{
 598	resource_size_t mapping_end = nd_mapping->start + nd_mapping->size - 1;
 599	bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
 600	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 601	struct resource *res, *exist = NULL, valid;
 602	const resource_size_t to_allocate = n;
 603	int first;
 604
 605	for_each_dpa_resource(ndd, res)
 606		if (strcmp(label_id->id, res->name) == 0)
 607			exist = res;
 608
 609	valid.start = nd_mapping->start;
 610	valid.end = mapping_end;
 611	valid.name = "free space";
 612 retry:
 613	first = 0;
 614	for_each_dpa_resource(ndd, res) {
 615		struct resource *next = res->sibling, *new_res = NULL;
 616		resource_size_t allocate, available = 0;
 617		enum alloc_loc loc = ALLOC_ERR;
 618		const char *action;
 619		int rc = 0;
 620
 621		/* ignore resources outside this nd_mapping */
 622		if (res->start > mapping_end)
 623			continue;
 624		if (res->end < nd_mapping->start)
 625			continue;
 626
 627		/* space at the beginning of the mapping */
 628		if (!first++ && res->start > nd_mapping->start) {
 629			valid.start = nd_mapping->start;
 630			valid.end = res->start - 1;
 631			space_valid(nd_region, ndd, label_id, NULL, next, exist,
 632					to_allocate, &valid);
 633			available = resource_size(&valid);
 634			if (available)
 635				loc = ALLOC_BEFORE;
 636		}
 637
 638		/* space between allocations */
 639		if (!loc && next) {
 640			valid.start = res->start + resource_size(res);
 641			valid.end = min(mapping_end, next->start - 1);
 642			space_valid(nd_region, ndd, label_id, res, next, exist,
 643					to_allocate, &valid);
 644			available = resource_size(&valid);
 645			if (available)
 646				loc = ALLOC_MID;
 647		}
 648
 649		/* space at the end of the mapping */
 650		if (!loc && !next) {
 651			valid.start = res->start + resource_size(res);
 652			valid.end = mapping_end;
 653			space_valid(nd_region, ndd, label_id, res, next, exist,
 654					to_allocate, &valid);
 655			available = resource_size(&valid);
 656			if (available)
 657				loc = ALLOC_AFTER;
 658		}
 659
 660		if (!loc || !available)
 661			continue;
 662		allocate = min(available, n);
 663		switch (loc) {
 664		case ALLOC_BEFORE:
 665			if (strcmp(res->name, label_id->id) == 0) {
 666				/* adjust current resource up */
 667				rc = adjust_resource(res, res->start - allocate,
 668						resource_size(res) + allocate);
 669				action = "cur grow up";
 670			} else
 671				action = "allocate";
 672			break;
 673		case ALLOC_MID:
 674			if (strcmp(next->name, label_id->id) == 0) {
 675				/* adjust next resource up */
 676				rc = adjust_resource(next, next->start
 677						- allocate, resource_size(next)
 678						+ allocate);
 679				new_res = next;
 680				action = "next grow up";
 681			} else if (strcmp(res->name, label_id->id) == 0) {
 682				action = "grow down";
 683			} else
 684				action = "allocate";
 685			break;
 686		case ALLOC_AFTER:
 687			if (strcmp(res->name, label_id->id) == 0)
 688				action = "grow down";
 689			else
 690				action = "allocate";
 691			break;
 692		default:
 693			return n;
 694		}
 695
 696		if (strcmp(action, "allocate") == 0) {
 697			/* BLK allocate bottom up */
 698			if (!is_pmem)
 699				valid.start += available - allocate;
 700
 701			new_res = nvdimm_allocate_dpa(ndd, label_id,
 702					valid.start, allocate);
 703			if (!new_res)
 704				rc = -EBUSY;
 705		} else if (strcmp(action, "grow down") == 0) {
 706			/* adjust current resource down */
 707			rc = adjust_resource(res, res->start, resource_size(res)
 708					+ allocate);
 709			if (rc == 0)
 710				res->flags |= DPA_RESOURCE_ADJUSTED;
 711		}
 712
 713		if (!new_res)
 714			new_res = res;
 715
 716		nd_dbg_dpa(nd_region, ndd, new_res, "%s(%d) %d\n",
 717				action, loc, rc);
 718
 719		if (rc)
 720			return n;
 721
 722		n -= allocate;
 723		if (n) {
 724			/*
 725			 * Retry scan with newly inserted resources.
 726			 * For example, if we did an ALLOC_BEFORE
 727			 * insertion there may also have been space
 728			 * available for an ALLOC_AFTER insertion, so we
 729			 * need to check this same resource again
 730			 */
 731			goto retry;
 732		} else
 733			return 0;
 734	}
 735
 736	/*
 737	 * If we allocated nothing in the BLK case it may be because we are in
 738	 * an initial "pmem-reserve pass".  Only do an initial BLK allocation
 739	 * when none of the DPA space is reserved.
 740	 */
 741	if ((is_pmem || !ndd->dpa.child) && n == to_allocate)
 742		return init_dpa_allocation(label_id, nd_region, nd_mapping, n);
 743	return n;
 744}
 745
 746static int merge_dpa(struct nd_region *nd_region,
 747		struct nd_mapping *nd_mapping, struct nd_label_id *label_id)
 748{
 749	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 750	struct resource *res;
 751
 752	if (strncmp("pmem", label_id->id, 4) == 0)
 753		return 0;
 754 retry:
 755	for_each_dpa_resource(ndd, res) {
 756		int rc;
 757		struct resource *next = res->sibling;
 758		resource_size_t end = res->start + resource_size(res);
 759
 760		if (!next || strcmp(res->name, label_id->id) != 0
 761				|| strcmp(next->name, label_id->id) != 0
 762				|| end != next->start)
 763			continue;
 764		end += resource_size(next);
 765		nvdimm_free_dpa(ndd, next);
 766		rc = adjust_resource(res, res->start, end - res->start);
 767		nd_dbg_dpa(nd_region, ndd, res, "merge %d\n", rc);
 768		if (rc)
 769			return rc;
 770		res->flags |= DPA_RESOURCE_ADJUSTED;
 771		goto retry;
 772	}
 773
 774	return 0;
 775}
 776
 777int __reserve_free_pmem(struct device *dev, void *data)
 778{
 779	struct nvdimm *nvdimm = data;
 780	struct nd_region *nd_region;
 781	struct nd_label_id label_id;
 782	int i;
 783
 784	if (!is_memory(dev))
 785		return 0;
 786
 787	nd_region = to_nd_region(dev);
 788	if (nd_region->ndr_mappings == 0)
 789		return 0;
 790
 791	memset(&label_id, 0, sizeof(label_id));
 792	strcat(label_id.id, "pmem-reserve");
 793	for (i = 0; i < nd_region->ndr_mappings; i++) {
 794		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
 795		resource_size_t n, rem = 0;
 796
 797		if (nd_mapping->nvdimm != nvdimm)
 798			continue;
 799
 800		n = nd_pmem_available_dpa(nd_region, nd_mapping, &rem);
 801		if (n == 0)
 802			return 0;
 803		rem = scan_allocate(nd_region, nd_mapping, &label_id, n);
 804		dev_WARN_ONCE(&nd_region->dev, rem,
 805				"pmem reserve underrun: %#llx of %#llx bytes\n",
 806				(unsigned long long) n - rem,
 807				(unsigned long long) n);
 808		return rem ? -ENXIO : 0;
 809	}
 810
 811	return 0;
 812}
 813
 814void release_free_pmem(struct nvdimm_bus *nvdimm_bus,
 815		struct nd_mapping *nd_mapping)
 816{
 817	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 818	struct resource *res, *_res;
 819
 820	for_each_dpa_resource_safe(ndd, res, _res)
 821		if (strcmp(res->name, "pmem-reserve") == 0)
 822			nvdimm_free_dpa(ndd, res);
 823}
 824
 825static int reserve_free_pmem(struct nvdimm_bus *nvdimm_bus,
 826		struct nd_mapping *nd_mapping)
 827{
 828	struct nvdimm *nvdimm = nd_mapping->nvdimm;
 829	int rc;
 830
 831	rc = device_for_each_child(&nvdimm_bus->dev, nvdimm,
 832			__reserve_free_pmem);
 833	if (rc)
 834		release_free_pmem(nvdimm_bus, nd_mapping);
 835	return rc;
 836}
 837
 838/**
 839 * grow_dpa_allocation - for each dimm allocate n bytes for @label_id
 840 * @nd_region: the set of dimms to allocate @n more bytes from
 841 * @label_id: unique identifier for the namespace consuming this dpa range
 842 * @n: number of bytes per-dimm to add to the existing allocation
 843 *
 844 * Assumes resources are ordered.  For BLK regions, first consume
 845 * BLK-only available DPA free space, then consume PMEM-aliased DPA
 846 * space starting at the highest DPA.  For PMEM regions start
 847 * allocations from the start of an interleave set and end at the first
 848 * BLK allocation or the end of the interleave set, whichever comes
 849 * first.
 850 */
 851static int grow_dpa_allocation(struct nd_region *nd_region,
 852		struct nd_label_id *label_id, resource_size_t n)
 853{
 854	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
 855	bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
 856	int i;
 857
 858	for (i = 0; i < nd_region->ndr_mappings; i++) {
 859		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
 860		resource_size_t rem = n;
 861		int rc, j;
 862
 863		/*
 864		 * In the BLK case try once with all unallocated PMEM
 865		 * reserved, and once without
 866		 */
 867		for (j = is_pmem; j < 2; j++) {
 868			bool blk_only = j == 0;
 869
 870			if (blk_only) {
 871				rc = reserve_free_pmem(nvdimm_bus, nd_mapping);
 872				if (rc)
 873					return rc;
 874			}
 875			rem = scan_allocate(nd_region, nd_mapping,
 876					label_id, rem);
 877			if (blk_only)
 878				release_free_pmem(nvdimm_bus, nd_mapping);
 879
 880			/* try again and allow encroachments into PMEM */
 881			if (rem == 0)
 882				break;
 883		}
 884
 885		dev_WARN_ONCE(&nd_region->dev, rem,
 886				"allocation underrun: %#llx of %#llx bytes\n",
 887				(unsigned long long) n - rem,
 888				(unsigned long long) n);
 889		if (rem)
 890			return -ENXIO;
 891
 892		rc = merge_dpa(nd_region, nd_mapping, label_id);
 893		if (rc)
 894			return rc;
 895	}
 896
 897	return 0;
 898}
 899
 900static void nd_namespace_pmem_set_resource(struct nd_region *nd_region,
 901		struct nd_namespace_pmem *nspm, resource_size_t size)
 902{
 903	struct resource *res = &nspm->nsio.res;
 904	resource_size_t offset = 0;
 905
 906	if (size && !nspm->uuid) {
 907		WARN_ON_ONCE(1);
 908		size = 0;
 909	}
 910
 911	if (size && nspm->uuid) {
 912		struct nd_mapping *nd_mapping = &nd_region->mapping[0];
 913		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 914		struct nd_label_id label_id;
 915		struct resource *res;
 916
 917		if (!ndd) {
 918			size = 0;
 919			goto out;
 920		}
 921
 922		nd_label_gen_id(&label_id, nspm->uuid, 0);
 923
 924		/* calculate a spa offset from the dpa allocation offset */
 925		for_each_dpa_resource(ndd, res)
 926			if (strcmp(res->name, label_id.id) == 0) {
 927				offset = (res->start - nd_mapping->start)
 928					* nd_region->ndr_mappings;
 929				goto out;
 930			}
 931
 932		WARN_ON_ONCE(1);
 933		size = 0;
 934	}
 935
 936 out:
 937	res->start = nd_region->ndr_start + offset;
 938	res->end = res->start + size - 1;
 939}
 940
 941static bool uuid_not_set(const u8 *uuid, struct device *dev, const char *where)
 942{
 943	if (!uuid) {
 944		dev_dbg(dev, "%s: uuid not set\n", where);
 945		return true;
 946	}
 947	return false;
 948}
 949
 950static ssize_t __size_store(struct device *dev, unsigned long long val)
 951{
 952	resource_size_t allocated = 0, available = 0;
 953	struct nd_region *nd_region = to_nd_region(dev->parent);
 954	struct nd_namespace_common *ndns = to_ndns(dev);
 955	struct nd_mapping *nd_mapping;
 956	struct nvdimm_drvdata *ndd;
 957	struct nd_label_id label_id;
 958	u32 flags = 0, remainder;
 959	int rc, i, id = -1;
 960	u8 *uuid = NULL;
 961
 962	if (dev->driver || ndns->claim)
 963		return -EBUSY;
 964
 965	if (is_namespace_pmem(dev)) {
 966		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
 967
 968		uuid = nspm->uuid;
 969		id = nspm->id;
 970	} else if (is_namespace_blk(dev)) {
 971		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 972
 973		uuid = nsblk->uuid;
 974		flags = NSLABEL_FLAG_LOCAL;
 975		id = nsblk->id;
 976	}
 977
 978	/*
 979	 * We need a uuid for the allocation-label and dimm(s) on which
 980	 * to store the label.
 981	 */
 982	if (uuid_not_set(uuid, dev, __func__))
 983		return -ENXIO;
 984	if (nd_region->ndr_mappings == 0) {
 985		dev_dbg(dev, "not associated with dimm(s)\n");
 986		return -ENXIO;
 987	}
 988
 989	div_u64_rem(val, nd_region->align, &remainder);
 990	if (remainder) {
 991		dev_dbg(dev, "%llu is not %ldK aligned\n", val,
 992				nd_region->align / SZ_1K);
 993		return -EINVAL;
 994	}
 995
 996	nd_label_gen_id(&label_id, uuid, flags);
 997	for (i = 0; i < nd_region->ndr_mappings; i++) {
 998		nd_mapping = &nd_region->mapping[i];
 999		ndd = to_ndd(nd_mapping);
1000
1001		/*
1002		 * All dimms in an interleave set, or the base dimm for a blk
1003		 * region, need to be enabled for the size to be changed.
1004		 */
1005		if (!ndd)
1006			return -ENXIO;
1007
1008		allocated += nvdimm_allocated_dpa(ndd, &label_id);
1009	}
1010	available = nd_region_allocatable_dpa(nd_region);
1011
1012	if (val > available + allocated)
1013		return -ENOSPC;
1014
1015	if (val == allocated)
1016		return 0;
1017
1018	val = div_u64(val, nd_region->ndr_mappings);
1019	allocated = div_u64(allocated, nd_region->ndr_mappings);
1020	if (val < allocated)
1021		rc = shrink_dpa_allocation(nd_region, &label_id,
1022				allocated - val);
1023	else
1024		rc = grow_dpa_allocation(nd_region, &label_id, val - allocated);
1025
1026	if (rc)
1027		return rc;
1028
1029	if (is_namespace_pmem(dev)) {
1030		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1031
1032		nd_namespace_pmem_set_resource(nd_region, nspm,
1033				val * nd_region->ndr_mappings);
1034	}
1035
1036	/*
1037	 * Try to delete the namespace if we deleted all of its
1038	 * allocation, this is not the seed or 0th device for the
1039	 * region, and it is not actively claimed by a btt, pfn, or dax
1040	 * instance.
1041	 */
1042	if (val == 0 && id != 0 && nd_region->ns_seed != dev && !ndns->claim)
1043		nd_device_unregister(dev, ND_ASYNC);
1044
1045	return rc;
1046}
1047
1048static ssize_t size_store(struct device *dev,
1049		struct device_attribute *attr, const char *buf, size_t len)
1050{
1051	struct nd_region *nd_region = to_nd_region(dev->parent);
1052	unsigned long long val;
1053	u8 **uuid = NULL;
1054	int rc;
1055
1056	rc = kstrtoull(buf, 0, &val);
1057	if (rc)
1058		return rc;
1059
1060	nd_device_lock(dev);
1061	nvdimm_bus_lock(dev);
1062	wait_nvdimm_bus_probe_idle(dev);
1063	rc = __size_store(dev, val);
1064	if (rc >= 0)
1065		rc = nd_namespace_label_update(nd_region, dev);
1066
1067	if (is_namespace_pmem(dev)) {
1068		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1069
1070		uuid = &nspm->uuid;
1071	} else if (is_namespace_blk(dev)) {
1072		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1073
1074		uuid = &nsblk->uuid;
1075	}
1076
1077	if (rc == 0 && val == 0 && uuid) {
1078		/* setting size zero == 'delete namespace' */
1079		kfree(*uuid);
1080		*uuid = NULL;
1081	}
1082
1083	dev_dbg(dev, "%llx %s (%d)\n", val, rc < 0 ? "fail" : "success", rc);
1084
1085	nvdimm_bus_unlock(dev);
1086	nd_device_unlock(dev);
1087
1088	return rc < 0 ? rc : len;
1089}
1090
1091resource_size_t __nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
1092{
1093	struct device *dev = &ndns->dev;
1094
1095	if (is_namespace_pmem(dev)) {
1096		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1097
1098		return resource_size(&nspm->nsio.res);
1099	} else if (is_namespace_blk(dev)) {
1100		return nd_namespace_blk_size(to_nd_namespace_blk(dev));
1101	} else if (is_namespace_io(dev)) {
1102		struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
1103
1104		return resource_size(&nsio->res);
1105	} else
1106		WARN_ONCE(1, "unknown namespace type\n");
1107	return 0;
1108}
1109
1110resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
1111{
1112	resource_size_t size;
1113
1114	nvdimm_bus_lock(&ndns->dev);
1115	size = __nvdimm_namespace_capacity(ndns);
1116	nvdimm_bus_unlock(&ndns->dev);
1117
1118	return size;
1119}
1120EXPORT_SYMBOL(nvdimm_namespace_capacity);
1121
1122bool nvdimm_namespace_locked(struct nd_namespace_common *ndns)
1123{
1124	int i;
1125	bool locked = false;
1126	struct device *dev = &ndns->dev;
1127	struct nd_region *nd_region = to_nd_region(dev->parent);
1128
1129	for (i = 0; i < nd_region->ndr_mappings; i++) {
1130		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1131		struct nvdimm *nvdimm = nd_mapping->nvdimm;
1132
1133		if (test_bit(NDD_LOCKED, &nvdimm->flags)) {
1134			dev_dbg(dev, "%s locked\n", nvdimm_name(nvdimm));
1135			locked = true;
1136		}
1137	}
1138	return locked;
1139}
1140EXPORT_SYMBOL(nvdimm_namespace_locked);
1141
1142static ssize_t size_show(struct device *dev,
1143		struct device_attribute *attr, char *buf)
1144{
1145	return sprintf(buf, "%llu\n", (unsigned long long)
1146			nvdimm_namespace_capacity(to_ndns(dev)));
1147}
1148static DEVICE_ATTR(size, 0444, size_show, size_store);
1149
1150static u8 *namespace_to_uuid(struct device *dev)
1151{
1152	if (is_namespace_pmem(dev)) {
1153		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1154
1155		return nspm->uuid;
1156	} else if (is_namespace_blk(dev)) {
1157		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1158
1159		return nsblk->uuid;
1160	} else
1161		return ERR_PTR(-ENXIO);
1162}
1163
1164static ssize_t uuid_show(struct device *dev,
1165		struct device_attribute *attr, char *buf)
1166{
1167	u8 *uuid = namespace_to_uuid(dev);
1168
1169	if (IS_ERR(uuid))
1170		return PTR_ERR(uuid);
1171	if (uuid)
1172		return sprintf(buf, "%pUb\n", uuid);
1173	return sprintf(buf, "\n");
1174}
1175
1176/**
1177 * namespace_update_uuid - check for a unique uuid and whether we're "renaming"
1178 * @nd_region: parent region so we can updates all dimms in the set
1179 * @dev: namespace type for generating label_id
1180 * @new_uuid: incoming uuid
1181 * @old_uuid: reference to the uuid storage location in the namespace object
1182 */
1183static int namespace_update_uuid(struct nd_region *nd_region,
1184		struct device *dev, u8 *new_uuid, u8 **old_uuid)
1185{
1186	u32 flags = is_namespace_blk(dev) ? NSLABEL_FLAG_LOCAL : 0;
1187	struct nd_label_id old_label_id;
1188	struct nd_label_id new_label_id;
1189	int i;
1190
1191	if (!nd_is_uuid_unique(dev, new_uuid))
1192		return -EINVAL;
1193
1194	if (*old_uuid == NULL)
1195		goto out;
1196
1197	/*
1198	 * If we've already written a label with this uuid, then it's
1199	 * too late to rename because we can't reliably update the uuid
1200	 * without losing the old namespace.  Userspace must delete this
1201	 * namespace to abandon the old uuid.
1202	 */
1203	for (i = 0; i < nd_region->ndr_mappings; i++) {
1204		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1205
1206		/*
1207		 * This check by itself is sufficient because old_uuid
1208		 * would be NULL above if this uuid did not exist in the
1209		 * currently written set.
1210		 *
1211		 * FIXME: can we delete uuid with zero dpa allocated?
1212		 */
1213		if (list_empty(&nd_mapping->labels))
1214			return -EBUSY;
1215	}
1216
1217	nd_label_gen_id(&old_label_id, *old_uuid, flags);
1218	nd_label_gen_id(&new_label_id, new_uuid, flags);
1219	for (i = 0; i < nd_region->ndr_mappings; i++) {
1220		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1221		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1222		struct nd_label_ent *label_ent;
1223		struct resource *res;
1224
1225		for_each_dpa_resource(ndd, res)
1226			if (strcmp(res->name, old_label_id.id) == 0)
1227				sprintf((void *) res->name, "%s",
1228						new_label_id.id);
1229
1230		mutex_lock(&nd_mapping->lock);
1231		list_for_each_entry(label_ent, &nd_mapping->labels, list) {
1232			struct nd_namespace_label *nd_label = label_ent->label;
1233			struct nd_label_id label_id;
1234
1235			if (!nd_label)
1236				continue;
1237			nd_label_gen_id(&label_id, nd_label->uuid,
1238					__le32_to_cpu(nd_label->flags));
1239			if (strcmp(old_label_id.id, label_id.id) == 0)
1240				set_bit(ND_LABEL_REAP, &label_ent->flags);
1241		}
1242		mutex_unlock(&nd_mapping->lock);
1243	}
1244	kfree(*old_uuid);
1245 out:
1246	*old_uuid = new_uuid;
1247	return 0;
1248}
1249
1250static ssize_t uuid_store(struct device *dev,
1251		struct device_attribute *attr, const char *buf, size_t len)
1252{
1253	struct nd_region *nd_region = to_nd_region(dev->parent);
1254	u8 *uuid = NULL;
1255	ssize_t rc = 0;
1256	u8 **ns_uuid;
1257
1258	if (is_namespace_pmem(dev)) {
1259		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1260
1261		ns_uuid = &nspm->uuid;
1262	} else if (is_namespace_blk(dev)) {
1263		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1264
1265		ns_uuid = &nsblk->uuid;
1266	} else
1267		return -ENXIO;
1268
1269	nd_device_lock(dev);
1270	nvdimm_bus_lock(dev);
1271	wait_nvdimm_bus_probe_idle(dev);
1272	if (to_ndns(dev)->claim)
1273		rc = -EBUSY;
1274	if (rc >= 0)
1275		rc = nd_uuid_store(dev, &uuid, buf, len);
1276	if (rc >= 0)
1277		rc = namespace_update_uuid(nd_region, dev, uuid, ns_uuid);
1278	if (rc >= 0)
1279		rc = nd_namespace_label_update(nd_region, dev);
1280	else
1281		kfree(uuid);
1282	dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
1283			buf[len - 1] == '\n' ? "" : "\n");
1284	nvdimm_bus_unlock(dev);
1285	nd_device_unlock(dev);
1286
1287	return rc < 0 ? rc : len;
1288}
1289static DEVICE_ATTR_RW(uuid);
1290
1291static ssize_t resource_show(struct device *dev,
1292		struct device_attribute *attr, char *buf)
1293{
1294	struct resource *res;
1295
1296	if (is_namespace_pmem(dev)) {
1297		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1298
1299		res = &nspm->nsio.res;
1300	} else if (is_namespace_io(dev)) {
1301		struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
1302
1303		res = &nsio->res;
1304	} else
1305		return -ENXIO;
1306
1307	/* no address to convey if the namespace has no allocation */
1308	if (resource_size(res) == 0)
1309		return -ENXIO;
1310	return sprintf(buf, "%#llx\n", (unsigned long long) res->start);
1311}
1312static DEVICE_ATTR_ADMIN_RO(resource);
1313
1314static const unsigned long blk_lbasize_supported[] = { 512, 520, 528,
1315	4096, 4104, 4160, 4224, 0 };
1316
1317static const unsigned long pmem_lbasize_supported[] = { 512, 4096, 0 };
1318
1319static ssize_t sector_size_show(struct device *dev,
1320		struct device_attribute *attr, char *buf)
1321{
1322	if (is_namespace_blk(dev)) {
1323		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1324
1325		return nd_size_select_show(nsblk->lbasize,
1326				blk_lbasize_supported, buf);
1327	}
1328
1329	if (is_namespace_pmem(dev)) {
1330		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1331
1332		return nd_size_select_show(nspm->lbasize,
1333				pmem_lbasize_supported, buf);
1334	}
1335	return -ENXIO;
1336}
1337
1338static ssize_t sector_size_store(struct device *dev,
1339		struct device_attribute *attr, const char *buf, size_t len)
1340{
1341	struct nd_region *nd_region = to_nd_region(dev->parent);
1342	const unsigned long *supported;
1343	unsigned long *lbasize;
1344	ssize_t rc = 0;
1345
1346	if (is_namespace_blk(dev)) {
1347		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1348
1349		lbasize = &nsblk->lbasize;
1350		supported = blk_lbasize_supported;
1351	} else if (is_namespace_pmem(dev)) {
1352		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1353
1354		lbasize = &nspm->lbasize;
1355		supported = pmem_lbasize_supported;
1356	} else
1357		return -ENXIO;
1358
1359	nd_device_lock(dev);
1360	nvdimm_bus_lock(dev);
1361	if (to_ndns(dev)->claim)
1362		rc = -EBUSY;
1363	if (rc >= 0)
1364		rc = nd_size_select_store(dev, buf, lbasize, supported);
1365	if (rc >= 0)
1366		rc = nd_namespace_label_update(nd_region, dev);
1367	dev_dbg(dev, "result: %zd %s: %s%s", rc, rc < 0 ? "tried" : "wrote",
1368			buf, buf[len - 1] == '\n' ? "" : "\n");
1369	nvdimm_bus_unlock(dev);
1370	nd_device_unlock(dev);
1371
1372	return rc ? rc : len;
1373}
1374static DEVICE_ATTR_RW(sector_size);
1375
1376static ssize_t dpa_extents_show(struct device *dev,
1377		struct device_attribute *attr, char *buf)
1378{
1379	struct nd_region *nd_region = to_nd_region(dev->parent);
1380	struct nd_label_id label_id;
1381	int count = 0, i;
1382	u8 *uuid = NULL;
1383	u32 flags = 0;
1384
1385	nvdimm_bus_lock(dev);
1386	if (is_namespace_pmem(dev)) {
1387		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1388
1389		uuid = nspm->uuid;
1390		flags = 0;
1391	} else if (is_namespace_blk(dev)) {
1392		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1393
1394		uuid = nsblk->uuid;
1395		flags = NSLABEL_FLAG_LOCAL;
1396	}
1397
1398	if (!uuid)
1399		goto out;
1400
1401	nd_label_gen_id(&label_id, uuid, flags);
1402	for (i = 0; i < nd_region->ndr_mappings; i++) {
1403		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1404		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1405		struct resource *res;
1406
1407		for_each_dpa_resource(ndd, res)
1408			if (strcmp(res->name, label_id.id) == 0)
1409				count++;
1410	}
1411 out:
1412	nvdimm_bus_unlock(dev);
1413
1414	return sprintf(buf, "%d\n", count);
1415}
1416static DEVICE_ATTR_RO(dpa_extents);
1417
1418static int btt_claim_class(struct device *dev)
1419{
1420	struct nd_region *nd_region = to_nd_region(dev->parent);
1421	int i, loop_bitmask = 0;
1422
1423	for (i = 0; i < nd_region->ndr_mappings; i++) {
1424		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1425		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1426		struct nd_namespace_index *nsindex;
1427
1428		/*
1429		 * If any of the DIMMs do not support labels the only
1430		 * possible BTT format is v1.
1431		 */
1432		if (!ndd) {
1433			loop_bitmask = 0;
1434			break;
1435		}
1436
1437		nsindex = to_namespace_index(ndd, ndd->ns_current);
1438		if (nsindex == NULL)
1439			loop_bitmask |= 1;
1440		else {
1441			/* check whether existing labels are v1.1 or v1.2 */
1442			if (__le16_to_cpu(nsindex->major) == 1
1443					&& __le16_to_cpu(nsindex->minor) == 1)
1444				loop_bitmask |= 2;
1445			else
1446				loop_bitmask |= 4;
1447		}
1448	}
1449	/*
1450	 * If nsindex is null loop_bitmask's bit 0 will be set, and if an index
1451	 * block is found, a v1.1 label for any mapping will set bit 1, and a
1452	 * v1.2 label will set bit 2.
1453	 *
1454	 * At the end of the loop, at most one of the three bits must be set.
1455	 * If multiple bits were set, it means the different mappings disagree
1456	 * about their labels, and this must be cleaned up first.
1457	 *
1458	 * If all the label index blocks are found to agree, nsindex of NULL
1459	 * implies labels haven't been initialized yet, and when they will,
1460	 * they will be of the 1.2 format, so we can assume BTT2.0
1461	 *
1462	 * If 1.1 labels are found, we enforce BTT1.1, and if 1.2 labels are
1463	 * found, we enforce BTT2.0
1464	 *
1465	 * If the loop was never entered, default to BTT1.1 (legacy namespaces)
1466	 */
1467	switch (loop_bitmask) {
1468	case 0:
1469	case 2:
1470		return NVDIMM_CCLASS_BTT;
1471	case 1:
1472	case 4:
1473		return NVDIMM_CCLASS_BTT2;
1474	default:
1475		return -ENXIO;
1476	}
1477}
1478
1479static ssize_t holder_show(struct device *dev,
1480		struct device_attribute *attr, char *buf)
1481{
1482	struct nd_namespace_common *ndns = to_ndns(dev);
1483	ssize_t rc;
1484
1485	nd_device_lock(dev);
1486	rc = sprintf(buf, "%s\n", ndns->claim ? dev_name(ndns->claim) : "");
1487	nd_device_unlock(dev);
1488
1489	return rc;
1490}
1491static DEVICE_ATTR_RO(holder);
1492
1493static int __holder_class_store(struct device *dev, const char *buf)
1494{
1495	struct nd_namespace_common *ndns = to_ndns(dev);
1496
1497	if (dev->driver || ndns->claim)
1498		return -EBUSY;
1499
1500	if (sysfs_streq(buf, "btt")) {
1501		int rc = btt_claim_class(dev);
1502
1503		if (rc < NVDIMM_CCLASS_NONE)
1504			return rc;
1505		ndns->claim_class = rc;
1506	} else if (sysfs_streq(buf, "pfn"))
1507		ndns->claim_class = NVDIMM_CCLASS_PFN;
1508	else if (sysfs_streq(buf, "dax"))
1509		ndns->claim_class = NVDIMM_CCLASS_DAX;
1510	else if (sysfs_streq(buf, ""))
1511		ndns->claim_class = NVDIMM_CCLASS_NONE;
1512	else
1513		return -EINVAL;
1514
 
 
 
 
1515	return 0;
1516}
1517
1518static ssize_t holder_class_store(struct device *dev,
1519		struct device_attribute *attr, const char *buf, size_t len)
1520{
1521	struct nd_region *nd_region = to_nd_region(dev->parent);
1522	int rc;
1523
1524	nd_device_lock(dev);
1525	nvdimm_bus_lock(dev);
1526	wait_nvdimm_bus_probe_idle(dev);
1527	rc = __holder_class_store(dev, buf);
1528	if (rc >= 0)
1529		rc = nd_namespace_label_update(nd_region, dev);
1530	dev_dbg(dev, "%s(%d)\n", rc < 0 ? "fail " : "", rc);
1531	nvdimm_bus_unlock(dev);
1532	nd_device_unlock(dev);
1533
1534	return rc < 0 ? rc : len;
1535}
1536
1537static ssize_t holder_class_show(struct device *dev,
1538		struct device_attribute *attr, char *buf)
1539{
1540	struct nd_namespace_common *ndns = to_ndns(dev);
1541	ssize_t rc;
1542
1543	nd_device_lock(dev);
1544	if (ndns->claim_class == NVDIMM_CCLASS_NONE)
1545		rc = sprintf(buf, "\n");
1546	else if ((ndns->claim_class == NVDIMM_CCLASS_BTT) ||
1547			(ndns->claim_class == NVDIMM_CCLASS_BTT2))
1548		rc = sprintf(buf, "btt\n");
1549	else if (ndns->claim_class == NVDIMM_CCLASS_PFN)
1550		rc = sprintf(buf, "pfn\n");
1551	else if (ndns->claim_class == NVDIMM_CCLASS_DAX)
1552		rc = sprintf(buf, "dax\n");
1553	else
1554		rc = sprintf(buf, "<unknown>\n");
1555	nd_device_unlock(dev);
1556
1557	return rc;
1558}
1559static DEVICE_ATTR_RW(holder_class);
1560
1561static ssize_t mode_show(struct device *dev,
1562		struct device_attribute *attr, char *buf)
1563{
1564	struct nd_namespace_common *ndns = to_ndns(dev);
1565	struct device *claim;
1566	char *mode;
1567	ssize_t rc;
1568
1569	nd_device_lock(dev);
1570	claim = ndns->claim;
1571	if (claim && is_nd_btt(claim))
1572		mode = "safe";
1573	else if (claim && is_nd_pfn(claim))
1574		mode = "memory";
1575	else if (claim && is_nd_dax(claim))
1576		mode = "dax";
1577	else if (!claim && pmem_should_map_pages(dev))
1578		mode = "memory";
1579	else
1580		mode = "raw";
1581	rc = sprintf(buf, "%s\n", mode);
1582	nd_device_unlock(dev);
1583
1584	return rc;
1585}
1586static DEVICE_ATTR_RO(mode);
1587
1588static ssize_t force_raw_store(struct device *dev,
1589		struct device_attribute *attr, const char *buf, size_t len)
1590{
1591	bool force_raw;
1592	int rc = strtobool(buf, &force_raw);
1593
1594	if (rc)
1595		return rc;
1596
1597	to_ndns(dev)->force_raw = force_raw;
1598	return len;
1599}
1600
1601static ssize_t force_raw_show(struct device *dev,
1602		struct device_attribute *attr, char *buf)
1603{
1604	return sprintf(buf, "%d\n", to_ndns(dev)->force_raw);
1605}
1606static DEVICE_ATTR_RW(force_raw);
1607
1608static struct attribute *nd_namespace_attributes[] = {
1609	&dev_attr_nstype.attr,
1610	&dev_attr_size.attr,
1611	&dev_attr_mode.attr,
1612	&dev_attr_uuid.attr,
1613	&dev_attr_holder.attr,
1614	&dev_attr_resource.attr,
1615	&dev_attr_alt_name.attr,
1616	&dev_attr_force_raw.attr,
1617	&dev_attr_sector_size.attr,
1618	&dev_attr_dpa_extents.attr,
1619	&dev_attr_holder_class.attr,
1620	NULL,
1621};
1622
1623static umode_t namespace_visible(struct kobject *kobj,
1624		struct attribute *a, int n)
1625{
1626	struct device *dev = container_of(kobj, struct device, kobj);
1627
1628	if (a == &dev_attr_resource.attr && is_namespace_blk(dev))
1629		return 0;
 
 
 
1630
1631	if (is_namespace_pmem(dev) || is_namespace_blk(dev)) {
1632		if (a == &dev_attr_size.attr)
1633			return 0644;
1634
1635		return a->mode;
1636	}
1637
1638	if (a == &dev_attr_nstype.attr || a == &dev_attr_size.attr
1639			|| a == &dev_attr_holder.attr
1640			|| a == &dev_attr_holder_class.attr
1641			|| a == &dev_attr_force_raw.attr
1642			|| a == &dev_attr_mode.attr)
1643		return a->mode;
1644
1645	return 0;
1646}
1647
1648static struct attribute_group nd_namespace_attribute_group = {
1649	.attrs = nd_namespace_attributes,
1650	.is_visible = namespace_visible,
1651};
1652
1653static const struct attribute_group *nd_namespace_attribute_groups[] = {
1654	&nd_device_attribute_group,
1655	&nd_namespace_attribute_group,
1656	&nd_numa_attribute_group,
1657	NULL,
1658};
1659
1660static const struct device_type namespace_io_device_type = {
1661	.name = "nd_namespace_io",
1662	.release = namespace_io_release,
1663	.groups = nd_namespace_attribute_groups,
1664};
1665
1666static const struct device_type namespace_pmem_device_type = {
1667	.name = "nd_namespace_pmem",
1668	.release = namespace_pmem_release,
1669	.groups = nd_namespace_attribute_groups,
1670};
1671
1672static const struct device_type namespace_blk_device_type = {
1673	.name = "nd_namespace_blk",
1674	.release = namespace_blk_release,
1675	.groups = nd_namespace_attribute_groups,
1676};
1677
1678static bool is_namespace_pmem(const struct device *dev)
1679{
1680	return dev ? dev->type == &namespace_pmem_device_type : false;
1681}
1682
1683static bool is_namespace_blk(const struct device *dev)
1684{
1685	return dev ? dev->type == &namespace_blk_device_type : false;
1686}
1687
1688static bool is_namespace_io(const struct device *dev)
1689{
1690	return dev ? dev->type == &namespace_io_device_type : false;
1691}
1692
1693struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev)
1694{
1695	struct nd_btt *nd_btt = is_nd_btt(dev) ? to_nd_btt(dev) : NULL;
1696	struct nd_pfn *nd_pfn = is_nd_pfn(dev) ? to_nd_pfn(dev) : NULL;
1697	struct nd_dax *nd_dax = is_nd_dax(dev) ? to_nd_dax(dev) : NULL;
1698	struct nd_namespace_common *ndns = NULL;
1699	resource_size_t size;
1700
1701	if (nd_btt || nd_pfn || nd_dax) {
1702		if (nd_btt)
1703			ndns = nd_btt->ndns;
1704		else if (nd_pfn)
1705			ndns = nd_pfn->ndns;
1706		else if (nd_dax)
1707			ndns = nd_dax->nd_pfn.ndns;
1708
1709		if (!ndns)
1710			return ERR_PTR(-ENODEV);
1711
1712		/*
1713		 * Flush any in-progess probes / removals in the driver
1714		 * for the raw personality of this namespace.
1715		 */
1716		nd_device_lock(&ndns->dev);
1717		nd_device_unlock(&ndns->dev);
1718		if (ndns->dev.driver) {
1719			dev_dbg(&ndns->dev, "is active, can't bind %s\n",
1720					dev_name(dev));
1721			return ERR_PTR(-EBUSY);
1722		}
1723		if (dev_WARN_ONCE(&ndns->dev, ndns->claim != dev,
1724					"host (%s) vs claim (%s) mismatch\n",
1725					dev_name(dev),
1726					dev_name(ndns->claim)))
1727			return ERR_PTR(-ENXIO);
1728	} else {
1729		ndns = to_ndns(dev);
1730		if (ndns->claim) {
1731			dev_dbg(dev, "claimed by %s, failing probe\n",
1732				dev_name(ndns->claim));
1733
1734			return ERR_PTR(-ENXIO);
1735		}
1736	}
1737
1738	if (nvdimm_namespace_locked(ndns))
1739		return ERR_PTR(-EACCES);
1740
1741	size = nvdimm_namespace_capacity(ndns);
1742	if (size < ND_MIN_NAMESPACE_SIZE) {
1743		dev_dbg(&ndns->dev, "%pa, too small must be at least %#x\n",
1744				&size, ND_MIN_NAMESPACE_SIZE);
1745		return ERR_PTR(-ENODEV);
1746	}
1747
1748	/*
1749	 * Note, alignment validation for fsdax and devdax mode
1750	 * namespaces happens in nd_pfn_validate() where infoblock
1751	 * padding parameters can be applied.
1752	 */
1753	if (pmem_should_map_pages(dev)) {
1754		struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
1755		struct resource *res = &nsio->res;
1756
1757		if (!IS_ALIGNED(res->start | (res->end + 1),
1758					memremap_compat_align())) {
1759			dev_err(&ndns->dev, "%pr misaligned, unable to map\n", res);
1760			return ERR_PTR(-EOPNOTSUPP);
1761		}
1762	}
1763
1764	if (is_namespace_pmem(&ndns->dev)) {
1765		struct nd_namespace_pmem *nspm;
1766
1767		nspm = to_nd_namespace_pmem(&ndns->dev);
1768		if (uuid_not_set(nspm->uuid, &ndns->dev, __func__))
1769			return ERR_PTR(-ENODEV);
1770	} else if (is_namespace_blk(&ndns->dev)) {
1771		struct nd_namespace_blk *nsblk;
1772
1773		nsblk = to_nd_namespace_blk(&ndns->dev);
1774		if (uuid_not_set(nsblk->uuid, &ndns->dev, __func__))
1775			return ERR_PTR(-ENODEV);
1776		if (!nsblk->lbasize) {
1777			dev_dbg(&ndns->dev, "sector size not set\n");
1778			return ERR_PTR(-ENODEV);
1779		}
1780		if (!nd_namespace_blk_validate(nsblk))
1781			return ERR_PTR(-ENODEV);
1782	}
1783
1784	return ndns;
1785}
1786EXPORT_SYMBOL(nvdimm_namespace_common_probe);
1787
1788int devm_namespace_enable(struct device *dev, struct nd_namespace_common *ndns,
1789		resource_size_t size)
1790{
1791	if (is_namespace_blk(&ndns->dev))
1792		return 0;
1793	return devm_nsio_enable(dev, to_nd_namespace_io(&ndns->dev), size);
1794}
1795EXPORT_SYMBOL_GPL(devm_namespace_enable);
1796
1797void devm_namespace_disable(struct device *dev, struct nd_namespace_common *ndns)
1798{
1799	if (is_namespace_blk(&ndns->dev))
1800		return;
1801	devm_nsio_disable(dev, to_nd_namespace_io(&ndns->dev));
1802}
1803EXPORT_SYMBOL_GPL(devm_namespace_disable);
1804
1805static struct device **create_namespace_io(struct nd_region *nd_region)
1806{
1807	struct nd_namespace_io *nsio;
1808	struct device *dev, **devs;
1809	struct resource *res;
1810
1811	nsio = kzalloc(sizeof(*nsio), GFP_KERNEL);
1812	if (!nsio)
1813		return NULL;
1814
1815	devs = kcalloc(2, sizeof(struct device *), GFP_KERNEL);
1816	if (!devs) {
1817		kfree(nsio);
1818		return NULL;
1819	}
1820
1821	dev = &nsio->common.dev;
1822	dev->type = &namespace_io_device_type;
1823	dev->parent = &nd_region->dev;
1824	res = &nsio->res;
1825	res->name = dev_name(&nd_region->dev);
1826	res->flags = IORESOURCE_MEM;
1827	res->start = nd_region->ndr_start;
1828	res->end = res->start + nd_region->ndr_size - 1;
1829
1830	devs[0] = dev;
1831	return devs;
1832}
1833
1834static bool has_uuid_at_pos(struct nd_region *nd_region, u8 *uuid,
1835		u64 cookie, u16 pos)
1836{
1837	struct nd_namespace_label *found = NULL;
1838	int i;
1839
1840	for (i = 0; i < nd_region->ndr_mappings; i++) {
1841		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1842		struct nd_interleave_set *nd_set = nd_region->nd_set;
1843		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1844		struct nd_label_ent *label_ent;
1845		bool found_uuid = false;
1846
1847		list_for_each_entry(label_ent, &nd_mapping->labels, list) {
1848			struct nd_namespace_label *nd_label = label_ent->label;
1849			u16 position, nlabel;
1850			u64 isetcookie;
1851
1852			if (!nd_label)
1853				continue;
1854			isetcookie = __le64_to_cpu(nd_label->isetcookie);
1855			position = __le16_to_cpu(nd_label->position);
1856			nlabel = __le16_to_cpu(nd_label->nlabel);
1857
1858			if (isetcookie != cookie)
1859				continue;
1860
1861			if (memcmp(nd_label->uuid, uuid, NSLABEL_UUID_LEN) != 0)
1862				continue;
1863
1864			if (namespace_label_has(ndd, type_guid)
1865					&& !guid_equal(&nd_set->type_guid,
1866						&nd_label->type_guid)) {
1867				dev_dbg(ndd->dev, "expect type_guid %pUb got %pUb\n",
1868						&nd_set->type_guid,
1869						&nd_label->type_guid);
1870				continue;
1871			}
1872
1873			if (found_uuid) {
1874				dev_dbg(ndd->dev, "duplicate entry for uuid\n");
1875				return false;
1876			}
1877			found_uuid = true;
1878			if (nlabel != nd_region->ndr_mappings)
1879				continue;
1880			if (position != pos)
1881				continue;
1882			found = nd_label;
1883			break;
1884		}
1885		if (found)
1886			break;
1887	}
1888	return found != NULL;
1889}
1890
1891static int select_pmem_id(struct nd_region *nd_region, u8 *pmem_id)
1892{
1893	int i;
1894
1895	if (!pmem_id)
1896		return -ENODEV;
1897
1898	for (i = 0; i < nd_region->ndr_mappings; i++) {
1899		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1900		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1901		struct nd_namespace_label *nd_label = NULL;
1902		u64 hw_start, hw_end, pmem_start, pmem_end;
1903		struct nd_label_ent *label_ent;
1904
1905		lockdep_assert_held(&nd_mapping->lock);
1906		list_for_each_entry(label_ent, &nd_mapping->labels, list) {
1907			nd_label = label_ent->label;
1908			if (!nd_label)
1909				continue;
1910			if (memcmp(nd_label->uuid, pmem_id, NSLABEL_UUID_LEN) == 0)
1911				break;
1912			nd_label = NULL;
1913		}
1914
1915		if (!nd_label) {
1916			WARN_ON(1);
1917			return -EINVAL;
1918		}
1919
1920		/*
1921		 * Check that this label is compliant with the dpa
1922		 * range published in NFIT
1923		 */
1924		hw_start = nd_mapping->start;
1925		hw_end = hw_start + nd_mapping->size;
1926		pmem_start = __le64_to_cpu(nd_label->dpa);
1927		pmem_end = pmem_start + __le64_to_cpu(nd_label->rawsize);
1928		if (pmem_start >= hw_start && pmem_start < hw_end
1929				&& pmem_end <= hw_end && pmem_end > hw_start)
1930			/* pass */;
1931		else {
1932			dev_dbg(&nd_region->dev, "%s invalid label for %pUb\n",
1933					dev_name(ndd->dev), nd_label->uuid);
1934			return -EINVAL;
1935		}
1936
1937		/* move recently validated label to the front of the list */
1938		list_move(&label_ent->list, &nd_mapping->labels);
1939	}
1940	return 0;
1941}
1942
1943/**
1944 * create_namespace_pmem - validate interleave set labelling, retrieve label0
1945 * @nd_region: region with mappings to validate
1946 * @nspm: target namespace to create
1947 * @nd_label: target pmem namespace label to evaluate
1948 */
1949static struct device *create_namespace_pmem(struct nd_region *nd_region,
1950		struct nd_namespace_index *nsindex,
1951		struct nd_namespace_label *nd_label)
1952{
1953	u64 cookie = nd_region_interleave_set_cookie(nd_region, nsindex);
1954	u64 altcookie = nd_region_interleave_set_altcookie(nd_region);
1955	struct nd_label_ent *label_ent;
1956	struct nd_namespace_pmem *nspm;
1957	struct nd_mapping *nd_mapping;
1958	resource_size_t size = 0;
1959	struct resource *res;
1960	struct device *dev;
1961	int rc = 0;
1962	u16 i;
1963
1964	if (cookie == 0) {
1965		dev_dbg(&nd_region->dev, "invalid interleave-set-cookie\n");
1966		return ERR_PTR(-ENXIO);
1967	}
1968
1969	if (__le64_to_cpu(nd_label->isetcookie) != cookie) {
1970		dev_dbg(&nd_region->dev, "invalid cookie in label: %pUb\n",
1971				nd_label->uuid);
1972		if (__le64_to_cpu(nd_label->isetcookie) != altcookie)
1973			return ERR_PTR(-EAGAIN);
1974
1975		dev_dbg(&nd_region->dev, "valid altcookie in label: %pUb\n",
1976				nd_label->uuid);
1977	}
1978
1979	nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
1980	if (!nspm)
1981		return ERR_PTR(-ENOMEM);
1982
1983	nspm->id = -1;
1984	dev = &nspm->nsio.common.dev;
1985	dev->type = &namespace_pmem_device_type;
1986	dev->parent = &nd_region->dev;
1987	res = &nspm->nsio.res;
1988	res->name = dev_name(&nd_region->dev);
1989	res->flags = IORESOURCE_MEM;
1990
1991	for (i = 0; i < nd_region->ndr_mappings; i++) {
1992		if (has_uuid_at_pos(nd_region, nd_label->uuid, cookie, i))
1993			continue;
1994		if (has_uuid_at_pos(nd_region, nd_label->uuid, altcookie, i))
1995			continue;
1996		break;
1997	}
1998
1999	if (i < nd_region->ndr_mappings) {
2000		struct nvdimm *nvdimm = nd_region->mapping[i].nvdimm;
2001
2002		/*
2003		 * Give up if we don't find an instance of a uuid at each
2004		 * position (from 0 to nd_region->ndr_mappings - 1), or if we
2005		 * find a dimm with two instances of the same uuid.
2006		 */
2007		dev_err(&nd_region->dev, "%s missing label for %pUb\n",
2008				nvdimm_name(nvdimm), nd_label->uuid);
2009		rc = -EINVAL;
2010		goto err;
2011	}
2012
2013	/*
2014	 * Fix up each mapping's 'labels' to have the validated pmem label for
2015	 * that position at labels[0], and NULL at labels[1].  In the process,
2016	 * check that the namespace aligns with interleave-set.  We know
2017	 * that it does not overlap with any blk namespaces by virtue of
2018	 * the dimm being enabled (i.e. nd_label_reserve_dpa()
2019	 * succeeded).
2020	 */
2021	rc = select_pmem_id(nd_region, nd_label->uuid);
2022	if (rc)
2023		goto err;
2024
2025	/* Calculate total size and populate namespace properties from label0 */
2026	for (i = 0; i < nd_region->ndr_mappings; i++) {
2027		struct nd_namespace_label *label0;
2028		struct nvdimm_drvdata *ndd;
2029
2030		nd_mapping = &nd_region->mapping[i];
2031		label_ent = list_first_entry_or_null(&nd_mapping->labels,
2032				typeof(*label_ent), list);
2033		label0 = label_ent ? label_ent->label : NULL;
2034
2035		if (!label0) {
2036			WARN_ON(1);
2037			continue;
2038		}
2039
2040		size += __le64_to_cpu(label0->rawsize);
2041		if (__le16_to_cpu(label0->position) != 0)
2042			continue;
2043		WARN_ON(nspm->alt_name || nspm->uuid);
2044		nspm->alt_name = kmemdup((void __force *) label0->name,
2045				NSLABEL_NAME_LEN, GFP_KERNEL);
2046		nspm->uuid = kmemdup((void __force *) label0->uuid,
2047				NSLABEL_UUID_LEN, GFP_KERNEL);
2048		nspm->lbasize = __le64_to_cpu(label0->lbasize);
2049		ndd = to_ndd(nd_mapping);
2050		if (namespace_label_has(ndd, abstraction_guid))
2051			nspm->nsio.common.claim_class
2052				= to_nvdimm_cclass(&label0->abstraction_guid);
2053
2054	}
2055
2056	if (!nspm->alt_name || !nspm->uuid) {
2057		rc = -ENOMEM;
2058		goto err;
2059	}
2060
2061	nd_namespace_pmem_set_resource(nd_region, nspm, size);
2062
2063	return dev;
2064 err:
2065	namespace_pmem_release(dev);
2066	switch (rc) {
2067	case -EINVAL:
2068		dev_dbg(&nd_region->dev, "invalid label(s)\n");
2069		break;
2070	case -ENODEV:
2071		dev_dbg(&nd_region->dev, "label not found\n");
2072		break;
2073	default:
2074		dev_dbg(&nd_region->dev, "unexpected err: %d\n", rc);
2075		break;
2076	}
2077	return ERR_PTR(rc);
2078}
2079
2080struct resource *nsblk_add_resource(struct nd_region *nd_region,
2081		struct nvdimm_drvdata *ndd, struct nd_namespace_blk *nsblk,
2082		resource_size_t start)
2083{
2084	struct nd_label_id label_id;
2085	struct resource *res;
2086
2087	nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
2088	res = krealloc(nsblk->res,
2089			sizeof(void *) * (nsblk->num_resources + 1),
2090			GFP_KERNEL);
2091	if (!res)
2092		return NULL;
2093	nsblk->res = (struct resource **) res;
2094	for_each_dpa_resource(ndd, res)
2095		if (strcmp(res->name, label_id.id) == 0
2096				&& res->start == start) {
2097			nsblk->res[nsblk->num_resources++] = res;
2098			return res;
2099		}
2100	return NULL;
2101}
2102
2103static struct device *nd_namespace_blk_create(struct nd_region *nd_region)
2104{
2105	struct nd_namespace_blk *nsblk;
2106	struct device *dev;
2107
2108	if (!is_nd_blk(&nd_region->dev))
2109		return NULL;
2110
2111	nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
2112	if (!nsblk)
2113		return NULL;
2114
2115	dev = &nsblk->common.dev;
2116	dev->type = &namespace_blk_device_type;
2117	nsblk->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL);
2118	if (nsblk->id < 0) {
2119		kfree(nsblk);
2120		return NULL;
2121	}
2122	dev_set_name(dev, "namespace%d.%d", nd_region->id, nsblk->id);
2123	dev->parent = &nd_region->dev;
 
2124
2125	return &nsblk->common.dev;
2126}
2127
2128static struct device *nd_namespace_pmem_create(struct nd_region *nd_region)
2129{
2130	struct nd_namespace_pmem *nspm;
2131	struct resource *res;
2132	struct device *dev;
2133
2134	if (!is_memory(&nd_region->dev))
2135		return NULL;
2136
2137	nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
2138	if (!nspm)
2139		return NULL;
2140
2141	dev = &nspm->nsio.common.dev;
2142	dev->type = &namespace_pmem_device_type;
2143	dev->parent = &nd_region->dev;
2144	res = &nspm->nsio.res;
2145	res->name = dev_name(&nd_region->dev);
2146	res->flags = IORESOURCE_MEM;
2147
2148	nspm->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL);
2149	if (nspm->id < 0) {
2150		kfree(nspm);
2151		return NULL;
2152	}
2153	dev_set_name(dev, "namespace%d.%d", nd_region->id, nspm->id);
 
 
2154	nd_namespace_pmem_set_resource(nd_region, nspm, 0);
2155
2156	return dev;
2157}
2158
2159void nd_region_create_ns_seed(struct nd_region *nd_region)
2160{
2161	WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2162
2163	if (nd_region_to_nstype(nd_region) == ND_DEVICE_NAMESPACE_IO)
2164		return;
2165
2166	if (is_nd_blk(&nd_region->dev))
2167		nd_region->ns_seed = nd_namespace_blk_create(nd_region);
2168	else
2169		nd_region->ns_seed = nd_namespace_pmem_create(nd_region);
2170
2171	/*
2172	 * Seed creation failures are not fatal, provisioning is simply
2173	 * disabled until memory becomes available
2174	 */
2175	if (!nd_region->ns_seed)
2176		dev_err(&nd_region->dev, "failed to create %s namespace\n",
2177				is_nd_blk(&nd_region->dev) ? "blk" : "pmem");
2178	else
2179		nd_device_register(nd_region->ns_seed);
2180}
2181
2182void nd_region_create_dax_seed(struct nd_region *nd_region)
2183{
2184	WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2185	nd_region->dax_seed = nd_dax_create(nd_region);
2186	/*
2187	 * Seed creation failures are not fatal, provisioning is simply
2188	 * disabled until memory becomes available
2189	 */
2190	if (!nd_region->dax_seed)
2191		dev_err(&nd_region->dev, "failed to create dax namespace\n");
2192}
2193
2194void nd_region_create_pfn_seed(struct nd_region *nd_region)
2195{
2196	WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2197	nd_region->pfn_seed = nd_pfn_create(nd_region);
2198	/*
2199	 * Seed creation failures are not fatal, provisioning is simply
2200	 * disabled until memory becomes available
2201	 */
2202	if (!nd_region->pfn_seed)
2203		dev_err(&nd_region->dev, "failed to create pfn namespace\n");
2204}
2205
2206void nd_region_create_btt_seed(struct nd_region *nd_region)
2207{
2208	WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
2209	nd_region->btt_seed = nd_btt_create(nd_region);
2210	/*
2211	 * Seed creation failures are not fatal, provisioning is simply
2212	 * disabled until memory becomes available
2213	 */
2214	if (!nd_region->btt_seed)
2215		dev_err(&nd_region->dev, "failed to create btt namespace\n");
2216}
2217
2218static int add_namespace_resource(struct nd_region *nd_region,
2219		struct nd_namespace_label *nd_label, struct device **devs,
2220		int count)
2221{
2222	struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2223	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2224	int i;
2225
2226	for (i = 0; i < count; i++) {
2227		u8 *uuid = namespace_to_uuid(devs[i]);
2228		struct resource *res;
2229
2230		if (IS_ERR_OR_NULL(uuid)) {
2231			WARN_ON(1);
2232			continue;
2233		}
2234
2235		if (memcmp(uuid, nd_label->uuid, NSLABEL_UUID_LEN) != 0)
2236			continue;
2237		if (is_namespace_blk(devs[i])) {
2238			res = nsblk_add_resource(nd_region, ndd,
2239					to_nd_namespace_blk(devs[i]),
2240					__le64_to_cpu(nd_label->dpa));
2241			if (!res)
2242				return -ENXIO;
2243			nd_dbg_dpa(nd_region, ndd, res, "%d assign\n", count);
2244		} else {
2245			dev_err(&nd_region->dev,
2246					"error: conflicting extents for uuid: %pUb\n",
2247					nd_label->uuid);
2248			return -ENXIO;
2249		}
2250		break;
2251	}
2252
2253	return i;
2254}
2255
2256static struct device *create_namespace_blk(struct nd_region *nd_region,
2257		struct nd_namespace_label *nd_label, int count)
2258{
2259
2260	struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2261	struct nd_interleave_set *nd_set = nd_region->nd_set;
2262	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2263	struct nd_namespace_blk *nsblk;
2264	char name[NSLABEL_NAME_LEN];
2265	struct device *dev = NULL;
2266	struct resource *res;
2267
2268	if (namespace_label_has(ndd, type_guid)) {
2269		if (!guid_equal(&nd_set->type_guid, &nd_label->type_guid)) {
2270			dev_dbg(ndd->dev, "expect type_guid %pUb got %pUb\n",
2271					&nd_set->type_guid,
2272					&nd_label->type_guid);
2273			return ERR_PTR(-EAGAIN);
2274		}
2275
2276		if (nd_label->isetcookie != __cpu_to_le64(nd_set->cookie2)) {
2277			dev_dbg(ndd->dev, "expect cookie %#llx got %#llx\n",
2278					nd_set->cookie2,
2279					__le64_to_cpu(nd_label->isetcookie));
2280			return ERR_PTR(-EAGAIN);
2281		}
2282	}
2283
2284	nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
2285	if (!nsblk)
2286		return ERR_PTR(-ENOMEM);
2287	dev = &nsblk->common.dev;
2288	dev->type = &namespace_blk_device_type;
2289	dev->parent = &nd_region->dev;
2290	nsblk->id = -1;
2291	nsblk->lbasize = __le64_to_cpu(nd_label->lbasize);
2292	nsblk->uuid = kmemdup(nd_label->uuid, NSLABEL_UUID_LEN,
2293			GFP_KERNEL);
2294	if (namespace_label_has(ndd, abstraction_guid))
2295		nsblk->common.claim_class
2296			= to_nvdimm_cclass(&nd_label->abstraction_guid);
2297	if (!nsblk->uuid)
2298		goto blk_err;
2299	memcpy(name, nd_label->name, NSLABEL_NAME_LEN);
2300	if (name[0]) {
2301		nsblk->alt_name = kmemdup(name, NSLABEL_NAME_LEN,
2302				GFP_KERNEL);
2303		if (!nsblk->alt_name)
2304			goto blk_err;
2305	}
2306	res = nsblk_add_resource(nd_region, ndd, nsblk,
2307			__le64_to_cpu(nd_label->dpa));
2308	if (!res)
2309		goto blk_err;
2310	nd_dbg_dpa(nd_region, ndd, res, "%d: assign\n", count);
2311	return dev;
2312 blk_err:
2313	namespace_blk_release(dev);
2314	return ERR_PTR(-ENXIO);
2315}
2316
2317static int cmp_dpa(const void *a, const void *b)
2318{
2319	const struct device *dev_a = *(const struct device **) a;
2320	const struct device *dev_b = *(const struct device **) b;
2321	struct nd_namespace_blk *nsblk_a, *nsblk_b;
2322	struct nd_namespace_pmem *nspm_a, *nspm_b;
2323
2324	if (is_namespace_io(dev_a))
2325		return 0;
2326
2327	if (is_namespace_blk(dev_a)) {
2328		nsblk_a = to_nd_namespace_blk(dev_a);
2329		nsblk_b = to_nd_namespace_blk(dev_b);
2330
2331		return memcmp(&nsblk_a->res[0]->start, &nsblk_b->res[0]->start,
2332				sizeof(resource_size_t));
2333	}
2334
2335	nspm_a = to_nd_namespace_pmem(dev_a);
2336	nspm_b = to_nd_namespace_pmem(dev_b);
2337
2338	return memcmp(&nspm_a->nsio.res.start, &nspm_b->nsio.res.start,
2339			sizeof(resource_size_t));
2340}
2341
2342static struct device **scan_labels(struct nd_region *nd_region)
2343{
2344	int i, count = 0;
2345	struct device *dev, **devs = NULL;
2346	struct nd_label_ent *label_ent, *e;
2347	struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2348	resource_size_t map_end = nd_mapping->start + nd_mapping->size - 1;
2349
2350	/* "safe" because create_namespace_pmem() might list_move() label_ent */
2351	list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) {
2352		struct nd_namespace_label *nd_label = label_ent->label;
2353		struct device **__devs;
2354		u32 flags;
2355
2356		if (!nd_label)
2357			continue;
2358		flags = __le32_to_cpu(nd_label->flags);
2359		if (is_nd_blk(&nd_region->dev)
2360				== !!(flags & NSLABEL_FLAG_LOCAL))
2361			/* pass, region matches label type */;
2362		else
2363			continue;
2364
2365		/* skip labels that describe extents outside of the region */
2366		if (__le64_to_cpu(nd_label->dpa) < nd_mapping->start ||
2367		    __le64_to_cpu(nd_label->dpa) > map_end)
2368				continue;
2369
2370		i = add_namespace_resource(nd_region, nd_label, devs, count);
2371		if (i < 0)
2372			goto err;
2373		if (i < count)
2374			continue;
2375		__devs = kcalloc(count + 2, sizeof(dev), GFP_KERNEL);
2376		if (!__devs)
2377			goto err;
2378		memcpy(__devs, devs, sizeof(dev) * count);
2379		kfree(devs);
2380		devs = __devs;
2381
2382		if (is_nd_blk(&nd_region->dev))
2383			dev = create_namespace_blk(nd_region, nd_label, count);
2384		else {
2385			struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2386			struct nd_namespace_index *nsindex;
2387
2388			nsindex = to_namespace_index(ndd, ndd->ns_current);
2389			dev = create_namespace_pmem(nd_region, nsindex, nd_label);
2390		}
2391
2392		if (IS_ERR(dev)) {
2393			switch (PTR_ERR(dev)) {
2394			case -EAGAIN:
2395				/* skip invalid labels */
2396				continue;
2397			case -ENODEV:
2398				/* fallthrough to seed creation */
2399				break;
2400			default:
2401				goto err;
2402			}
2403		} else
2404			devs[count++] = dev;
2405
2406	}
2407
2408	dev_dbg(&nd_region->dev, "discovered %d %s namespace%s\n",
2409			count, is_nd_blk(&nd_region->dev)
2410			? "blk" : "pmem", count == 1 ? "" : "s");
2411
2412	if (count == 0) {
2413		/* Publish a zero-sized namespace for userspace to configure. */
2414		nd_mapping_free_labels(nd_mapping);
2415
2416		devs = kcalloc(2, sizeof(dev), GFP_KERNEL);
2417		if (!devs)
2418			goto err;
2419		if (is_nd_blk(&nd_region->dev)) {
2420			struct nd_namespace_blk *nsblk;
2421
2422			nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
2423			if (!nsblk)
2424				goto err;
2425			dev = &nsblk->common.dev;
2426			dev->type = &namespace_blk_device_type;
2427		} else {
2428			struct nd_namespace_pmem *nspm;
2429
2430			nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
2431			if (!nspm)
2432				goto err;
2433			dev = &nspm->nsio.common.dev;
2434			dev->type = &namespace_pmem_device_type;
2435			nd_namespace_pmem_set_resource(nd_region, nspm, 0);
2436		}
2437		dev->parent = &nd_region->dev;
2438		devs[count++] = dev;
2439	} else if (is_memory(&nd_region->dev)) {
2440		/* clean unselected labels */
2441		for (i = 0; i < nd_region->ndr_mappings; i++) {
2442			struct list_head *l, *e;
2443			LIST_HEAD(list);
2444			int j;
2445
2446			nd_mapping = &nd_region->mapping[i];
2447			if (list_empty(&nd_mapping->labels)) {
2448				WARN_ON(1);
2449				continue;
2450			}
2451
2452			j = count;
2453			list_for_each_safe(l, e, &nd_mapping->labels) {
2454				if (!j--)
2455					break;
2456				list_move_tail(l, &list);
2457			}
2458			nd_mapping_free_labels(nd_mapping);
2459			list_splice_init(&list, &nd_mapping->labels);
2460		}
2461	}
2462
2463	if (count > 1)
2464		sort(devs, count, sizeof(struct device *), cmp_dpa, NULL);
2465
2466	return devs;
2467
2468 err:
2469	if (devs) {
2470		for (i = 0; devs[i]; i++)
2471			if (is_nd_blk(&nd_region->dev))
2472				namespace_blk_release(devs[i]);
2473			else
2474				namespace_pmem_release(devs[i]);
2475		kfree(devs);
2476	}
2477	return NULL;
2478}
2479
2480static struct device **create_namespaces(struct nd_region *nd_region)
2481{
2482	struct nd_mapping *nd_mapping;
2483	struct device **devs;
2484	int i;
2485
2486	if (nd_region->ndr_mappings == 0)
2487		return NULL;
2488
2489	/* lock down all mappings while we scan labels */
2490	for (i = 0; i < nd_region->ndr_mappings; i++) {
2491		nd_mapping = &nd_region->mapping[i];
2492		mutex_lock_nested(&nd_mapping->lock, i);
2493	}
2494
2495	devs = scan_labels(nd_region);
2496
2497	for (i = 0; i < nd_region->ndr_mappings; i++) {
2498		int reverse = nd_region->ndr_mappings - 1 - i;
2499
2500		nd_mapping = &nd_region->mapping[reverse];
2501		mutex_unlock(&nd_mapping->lock);
2502	}
2503
2504	return devs;
2505}
2506
2507static void deactivate_labels(void *region)
2508{
2509	struct nd_region *nd_region = region;
2510	int i;
2511
2512	for (i = 0; i < nd_region->ndr_mappings; i++) {
2513		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
2514		struct nvdimm_drvdata *ndd = nd_mapping->ndd;
2515		struct nvdimm *nvdimm = nd_mapping->nvdimm;
2516
2517		mutex_lock(&nd_mapping->lock);
2518		nd_mapping_free_labels(nd_mapping);
2519		mutex_unlock(&nd_mapping->lock);
2520
2521		put_ndd(ndd);
2522		nd_mapping->ndd = NULL;
2523		if (ndd)
2524			atomic_dec(&nvdimm->busy);
2525	}
2526}
2527
2528static int init_active_labels(struct nd_region *nd_region)
2529{
2530	int i;
2531
2532	for (i = 0; i < nd_region->ndr_mappings; i++) {
2533		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
2534		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2535		struct nvdimm *nvdimm = nd_mapping->nvdimm;
2536		struct nd_label_ent *label_ent;
2537		int count, j;
2538
2539		/*
2540		 * If the dimm is disabled then we may need to prevent
2541		 * the region from being activated.
2542		 */
2543		if (!ndd) {
2544			if (test_bit(NDD_LOCKED, &nvdimm->flags))
2545				/* fail, label data may be unreadable */;
2546			else if (test_bit(NDD_LABELING, &nvdimm->flags))
2547				/* fail, labels needed to disambiguate dpa */;
2548			else
2549				return 0;
2550
2551			dev_err(&nd_region->dev, "%s: is %s, failing probe\n",
2552					dev_name(&nd_mapping->nvdimm->dev),
2553					test_bit(NDD_LOCKED, &nvdimm->flags)
2554					? "locked" : "disabled");
2555			return -ENXIO;
2556		}
2557		nd_mapping->ndd = ndd;
2558		atomic_inc(&nvdimm->busy);
2559		get_ndd(ndd);
2560
2561		count = nd_label_active_count(ndd);
2562		dev_dbg(ndd->dev, "count: %d\n", count);
2563		if (!count)
2564			continue;
2565		for (j = 0; j < count; j++) {
2566			struct nd_namespace_label *label;
2567
2568			label_ent = kzalloc(sizeof(*label_ent), GFP_KERNEL);
2569			if (!label_ent)
2570				break;
2571			label = nd_label_active(ndd, j);
2572			if (test_bit(NDD_NOBLK, &nvdimm->flags)) {
2573				u32 flags = __le32_to_cpu(label->flags);
2574
2575				flags &= ~NSLABEL_FLAG_LOCAL;
2576				label->flags = __cpu_to_le32(flags);
2577			}
2578			label_ent->label = label;
2579
2580			mutex_lock(&nd_mapping->lock);
2581			list_add_tail(&label_ent->list, &nd_mapping->labels);
2582			mutex_unlock(&nd_mapping->lock);
2583		}
2584
2585		if (j < count)
2586			break;
2587	}
2588
2589	if (i < nd_region->ndr_mappings) {
2590		deactivate_labels(nd_region);
 
2591		return -ENOMEM;
2592	}
2593
2594	return devm_add_action_or_reset(&nd_region->dev, deactivate_labels,
2595			nd_region);
2596}
2597
2598int nd_region_register_namespaces(struct nd_region *nd_region, int *err)
2599{
2600	struct device **devs = NULL;
2601	int i, rc = 0, type;
2602
2603	*err = 0;
2604	nvdimm_bus_lock(&nd_region->dev);
2605	rc = init_active_labels(nd_region);
2606	if (rc) {
2607		nvdimm_bus_unlock(&nd_region->dev);
2608		return rc;
2609	}
2610
2611	type = nd_region_to_nstype(nd_region);
2612	switch (type) {
2613	case ND_DEVICE_NAMESPACE_IO:
2614		devs = create_namespace_io(nd_region);
2615		break;
2616	case ND_DEVICE_NAMESPACE_PMEM:
2617	case ND_DEVICE_NAMESPACE_BLK:
2618		devs = create_namespaces(nd_region);
2619		break;
2620	default:
2621		break;
2622	}
2623	nvdimm_bus_unlock(&nd_region->dev);
2624
2625	if (!devs)
2626		return -ENODEV;
2627
2628	for (i = 0; devs[i]; i++) {
2629		struct device *dev = devs[i];
2630		int id;
2631
2632		if (type == ND_DEVICE_NAMESPACE_BLK) {
2633			struct nd_namespace_blk *nsblk;
2634
2635			nsblk = to_nd_namespace_blk(dev);
2636			id = ida_simple_get(&nd_region->ns_ida, 0, 0,
2637					GFP_KERNEL);
2638			nsblk->id = id;
2639		} else if (type == ND_DEVICE_NAMESPACE_PMEM) {
2640			struct nd_namespace_pmem *nspm;
2641
2642			nspm = to_nd_namespace_pmem(dev);
2643			id = ida_simple_get(&nd_region->ns_ida, 0, 0,
2644					GFP_KERNEL);
2645			nspm->id = id;
2646		} else
2647			id = i;
2648
2649		if (id < 0)
2650			break;
2651		dev_set_name(dev, "namespace%d.%d", nd_region->id, id);
 
2652		nd_device_register(dev);
2653	}
2654	if (i)
2655		nd_region->ns_seed = devs[0];
2656
2657	if (devs[i]) {
2658		int j;
2659
2660		for (j = i; devs[j]; j++) {
2661			struct device *dev = devs[j];
2662
2663			device_initialize(dev);
2664			put_device(dev);
2665		}
2666		*err = j - i;
2667		/*
2668		 * All of the namespaces we tried to register failed, so
2669		 * fail region activation.
2670		 */
2671		if (*err == 0)
2672			rc = -ENODEV;
2673	}
2674	kfree(devs);
2675
2676	if (rc == -ENODEV)
2677		return rc;
2678
2679	return i;
2680}