1/*
   2 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
   3 *
   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.
   7 *
   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.
  12 */
  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>
  19#include <linux/nd.h>
  20#include "nd-core.h"
 
 
  21#include "nd.h"
  22
  23static void namespace_io_release(struct device *dev)
  24{
  25	struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
  26
  27	kfree(nsio);
  28}
  29
  30static void namespace_pmem_release(struct device *dev)
  31{
  32	struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
  33	struct nd_region *nd_region = to_nd_region(dev->parent);
  34
  35	if (nspm->id >= 0)
  36		ida_simple_remove(&nd_region->ns_ida, nspm->id);
  37	kfree(nspm->alt_name);
  38	kfree(nspm->uuid);
  39	kfree(nspm);
  40}
  41
  42static void namespace_blk_release(struct device *dev)
  43{
  44	struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
  45	struct nd_region *nd_region = to_nd_region(dev->parent);
  46
  47	if (nsblk->id >= 0)
  48		ida_simple_remove(&nd_region->ns_ida, nsblk->id);
  49	kfree(nsblk->alt_name);
  50	kfree(nsblk->uuid);
  51	kfree(nsblk->res);
  52	kfree(nsblk);
  53}
  54
  55static const struct device_type namespace_io_device_type = {
  56	.name = "nd_namespace_io",
  57	.release = namespace_io_release,
  58};
  59
  60static const struct device_type namespace_pmem_device_type = {
  61	.name = "nd_namespace_pmem",
  62	.release = namespace_pmem_release,
  63};
  64
  65static const struct device_type namespace_blk_device_type = {
  66	.name = "nd_namespace_blk",
  67	.release = namespace_blk_release,
  68};
  69
  70static bool is_namespace_pmem(const struct device *dev)
  71{
  72	return dev ? dev->type == &namespace_pmem_device_type : false;
  73}
  74
  75static bool is_namespace_blk(const struct device *dev)
  76{
  77	return dev ? dev->type == &namespace_blk_device_type : false;
  78}
  79
  80static bool is_namespace_io(const struct device *dev)
  81{
  82	return dev ? dev->type == &namespace_io_device_type : false;
  83}
  84
  85static int is_uuid_busy(struct device *dev, void *data)
  86{
  87	u8 *uuid1 = data, *uuid2 = NULL;
  88
  89	if (is_namespace_pmem(dev)) {
  90		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
  91
  92		uuid2 = nspm->uuid;
  93	} else if (is_namespace_blk(dev)) {
  94		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
  95
  96		uuid2 = nsblk->uuid;
  97	} else if (is_nd_btt(dev)) {
  98		struct nd_btt *nd_btt = to_nd_btt(dev);
  99
 100		uuid2 = nd_btt->uuid;
 101	} else if (is_nd_pfn(dev)) {
 102		struct nd_pfn *nd_pfn = to_nd_pfn(dev);
 103
 104		uuid2 = nd_pfn->uuid;
 105	}
 106
 107	if (uuid2 && memcmp(uuid1, uuid2, NSLABEL_UUID_LEN) == 0)
 108		return -EBUSY;
 109
 110	return 0;
 111}
 112
 113static int is_namespace_uuid_busy(struct device *dev, void *data)
 114{
 115	if (is_nd_pmem(dev) || is_nd_blk(dev))
 116		return device_for_each_child(dev, data, is_uuid_busy);
 117	return 0;
 118}
 119
 120/**
 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
 124 */
 125bool nd_is_uuid_unique(struct device *dev, u8 *uuid)
 126{
 127	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
 128
 129	if (!nvdimm_bus)
 130		return false;
 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)
 134		return false;
 135	return true;
 136}
 137
 138bool pmem_should_map_pages(struct device *dev)
 139{
 140	struct nd_region *nd_region = to_nd_region(dev->parent);
 
 141	struct nd_namespace_io *nsio;
 142
 143	if (!IS_ENABLED(CONFIG_ZONE_DEVICE))
 144		return false;
 145
 146	if (!test_bit(ND_REGION_PAGEMAP, &nd_region->flags))
 147		return false;
 148
 149	if (is_nd_pfn(dev) || is_nd_btt(dev))
 150		return false;
 151
 
 
 
 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)
 156		return false;
 157
 158#ifdef ARCH_MEMREMAP_PMEM
 159	return ARCH_MEMREMAP_PMEM == MEMREMAP_WB;
 160#else
 161	return false;
 162#endif
 163}
 164EXPORT_SYMBOL(pmem_should_map_pages);
 165
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 166const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
 167		char *name)
 168{
 169	struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
 170	const char *suffix = NULL;
 171
 172	if (ndns->claim && is_nd_btt(ndns->claim))
 173		suffix = "s";
 174
 175	if (is_namespace_pmem(&ndns->dev) || is_namespace_io(&ndns->dev)) {
 176		int nsidx = 0;
 177
 178		if (is_namespace_pmem(&ndns->dev)) {
 179			struct nd_namespace_pmem *nspm;
 180
 181			nspm = to_nd_namespace_pmem(&ndns->dev);
 182			nsidx = nspm->id;
 183		}
 184
 185		if (nsidx)
 186			sprintf(name, "pmem%d.%d%s", nd_region->id, nsidx,
 187					suffix ? suffix : "");
 188		else
 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;
 193
 194		nsblk = to_nd_namespace_blk(&ndns->dev);
 195		sprintf(name, "ndblk%d.%d%s", nd_region->id, nsblk->id,
 196				suffix ? suffix : "");
 197	} else {
 198		return NULL;
 199	}
 200
 201	return name;
 202}
 203EXPORT_SYMBOL(nvdimm_namespace_disk_name);
 204
 205const u8 *nd_dev_to_uuid(struct device *dev)
 206{
 207	static const u8 null_uuid[16];
 208
 209	if (!dev)
 210		return null_uuid;
 211
 212	if (is_namespace_pmem(dev)) {
 213		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
 214
 215		return nspm->uuid;
 216	} else if (is_namespace_blk(dev)) {
 217		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 218
 219		return nsblk->uuid;
 220	} else
 221		return null_uuid;
 222}
 223EXPORT_SYMBOL(nd_dev_to_uuid);
 224
 225static ssize_t nstype_show(struct device *dev,
 226		struct device_attribute *attr, char *buf)
 227{
 228	struct nd_region *nd_region = to_nd_region(dev->parent);
 229
 230	return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region));
 231}
 232static DEVICE_ATTR_RO(nstype);
 233
 234static ssize_t __alt_name_store(struct device *dev, const char *buf,
 235		const size_t len)
 236{
 237	char *input, *pos, *alt_name, **ns_altname;
 238	ssize_t rc;
 239
 240	if (is_namespace_pmem(dev)) {
 241		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
 242
 243		ns_altname = &nspm->alt_name;
 244	} else if (is_namespace_blk(dev)) {
 245		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 246
 247		ns_altname = &nsblk->alt_name;
 248	} else
 249		return -ENXIO;
 250
 251	if (dev->driver || to_ndns(dev)->claim)
 252		return -EBUSY;
 253
 254	input = kmemdup(buf, len + 1, GFP_KERNEL);
 255	if (!input)
 256		return -ENOMEM;
 257
 258	input[len] = '\0';
 259	pos = strim(input);
 260	if (strlen(pos) + 1 > NSLABEL_NAME_LEN) {
 261		rc = -EINVAL;
 262		goto out;
 263	}
 264
 265	alt_name = kzalloc(NSLABEL_NAME_LEN, GFP_KERNEL);
 266	if (!alt_name) {
 267		rc = -ENOMEM;
 268		goto out;
 269	}
 270	kfree(*ns_altname);
 271	*ns_altname = alt_name;
 272	sprintf(*ns_altname, "%s", pos);
 273	rc = len;
 274
 275out:
 276	kfree(input);
 277	return rc;
 278}
 279
 280static resource_size_t nd_namespace_blk_size(struct nd_namespace_blk *nsblk)
 281{
 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;
 288
 289	if (!nsblk->uuid)
 290		return 0;
 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);
 295	return size;
 296}
 297
 298static bool __nd_namespace_blk_validate(struct nd_namespace_blk *nsblk)
 299{
 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;
 305	int count, i;
 306
 307	if (!nsblk->uuid || !nsblk->lbasize || !ndd)
 308		return false;
 309
 310	count = 0;
 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)
 314			continue;
 315		/*
 316		 * Resources with unacknowledged adjustments indicate a
 317		 * failure to update labels
 318		 */
 319		if (res->flags & DPA_RESOURCE_ADJUSTED)
 320			return false;
 321		count++;
 322	}
 323
 324	/* These values match after a successful label update */
 325	if (count != nsblk->num_resources)
 326		return false;
 327
 328	for (i = 0; i < nsblk->num_resources; i++) {
 329		struct resource *found = NULL;
 330
 331		for_each_dpa_resource(ndd, res)
 332			if (res == nsblk->res[i]) {
 333				found = res;
 334				break;
 335			}
 336		/* stale resource */
 337		if (!found)
 338			return false;
 339	}
 340
 341	return true;
 342}
 343
 344resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk)
 345{
 346	resource_size_t size;
 347
 348	nvdimm_bus_lock(&nsblk->common.dev);
 349	size = __nd_namespace_blk_validate(nsblk);
 350	nvdimm_bus_unlock(&nsblk->common.dev);
 351
 352	return size;
 353}
 354EXPORT_SYMBOL(nd_namespace_blk_validate);
 355
 356
 357static int nd_namespace_label_update(struct nd_region *nd_region,
 358		struct device *dev)
 359{
 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)
 363		return 0;
 364
 365	/*
 366	 * Only allow label writes that will result in a valid namespace
 367	 * or deletion of an existing namespace.
 368	 */
 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);
 372
 373		if (size == 0 && nspm->uuid)
 374			/* delete allocation */;
 375		else if (!nspm->uuid)
 376			return 0;
 377
 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);
 382
 383		if (size == 0 && nsblk->uuid)
 384			/* delete allocation */;
 385		else if (!nsblk->uuid || !nsblk->lbasize)
 386			return 0;
 387
 388		return nd_blk_namespace_label_update(nd_region, nsblk, size);
 389	} else
 390		return -ENXIO;
 391}
 392
 393static ssize_t alt_name_store(struct device *dev,
 394		struct device_attribute *attr, const char *buf, size_t len)
 395{
 396	struct nd_region *nd_region = to_nd_region(dev->parent);
 397	ssize_t rc;
 398
 399	device_lock(dev);
 400	nvdimm_bus_lock(dev);
 401	wait_nvdimm_bus_probe_idle(dev);
 402	rc = __alt_name_store(dev, buf, len);
 403	if (rc >= 0)
 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);
 407	device_unlock(dev);
 408
 409	return rc < 0 ? rc : len;
 410}
 411
 412static ssize_t alt_name_show(struct device *dev,
 413		struct device_attribute *attr, char *buf)
 414{
 415	char *ns_altname;
 416
 417	if (is_namespace_pmem(dev)) {
 418		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
 419
 420		ns_altname = nspm->alt_name;
 421	} else if (is_namespace_blk(dev)) {
 422		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 423
 424		ns_altname = nsblk->alt_name;
 425	} else
 426		return -ENXIO;
 427
 428	return sprintf(buf, "%s\n", ns_altname ? ns_altname : "");
 429}
 430static DEVICE_ATTR_RW(alt_name);
 431
 432static int scan_free(struct nd_region *nd_region,
 433		struct nd_mapping *nd_mapping, struct nd_label_id *label_id,
 434		resource_size_t n)
 435{
 436	bool is_blk = strncmp(label_id->id, "blk", 3) == 0;
 437	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 438	int rc = 0;
 439
 440	while (n) {
 441		struct resource *res, *last;
 442		resource_size_t new_start;
 443
 444		last = NULL;
 445		for_each_dpa_resource(ndd, res)
 446			if (strcmp(res->name, label_id->id) == 0)
 447				last = res;
 448		res = last;
 449		if (!res)
 450			return 0;
 451
 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 */
 457			continue;
 458		}
 459
 460		/*
 461		 * Keep BLK allocations relegated to high DPA as much as
 462		 * possible
 463		 */
 464		if (is_blk)
 465			new_start = res->start + n;
 466		else
 467			new_start = res->start;
 468
 469		rc = adjust_resource(res, new_start, resource_size(res) - n);
 470		if (rc == 0)
 471			res->flags |= DPA_RESOURCE_ADJUSTED;
 472		nd_dbg_dpa(nd_region, ndd, res, "shrink %d\n", rc);
 473		break;
 474	}
 475
 476	return rc;
 477}
 478
 479/**
 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
 484 *
 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
 488 * set.
 489 */
 490static int shrink_dpa_allocation(struct nd_region *nd_region,
 491		struct nd_label_id *label_id, resource_size_t n)
 492{
 493	int i;
 494
 495	for (i = 0; i < nd_region->ndr_mappings; i++) {
 496		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
 497		int rc;
 498
 499		rc = scan_free(nd_region, nd_mapping, label_id, n);
 500		if (rc)
 501			return rc;
 502	}
 503
 504	return 0;
 505}
 506
 507static resource_size_t init_dpa_allocation(struct nd_label_id *label_id,
 508		struct nd_region *nd_region, struct nd_mapping *nd_mapping,
 509		resource_size_t n)
 510{
 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;
 515	int rc = 0;
 516
 517	/* allocate blk from highest dpa first */
 518	if (is_blk)
 519		first_dpa = nd_mapping->start + nd_mapping->size - n;
 520	else
 521		first_dpa = nd_mapping->start;
 522
 523	/* first resource allocation for this label-id or dimm */
 524	res = nvdimm_allocate_dpa(ndd, label_id, first_dpa, n);
 525	if (!res)
 526		rc = -EBUSY;
 527
 528	nd_dbg_dpa(nd_region, ndd, res, "init %d\n", rc);
 529	return rc ? n : 0;
 530}
 531
 532
 533/**
 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
 543 *
 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.
 548 */
 549static 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)
 553{
 554	bool is_reserve = strcmp(label_id->id, "pmem-reserve") == 0;
 555	bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
 
 
 
 
 556
 557	if (valid->start >= valid->end)
 558		goto invalid;
 559
 560	if (is_reserve)
 561		return;
 562
 563	if (!is_pmem) {
 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,
 569			.res = valid,
 570		};
 571
 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);
 575		return;
 576	}
 577
 578	/* allocation needs to be contiguous, so this is all or nothing */
 579	if (resource_size(valid) < n)
 580		goto invalid;
 581
 582	/* we've got all the space we need and no existing allocation */
 583	if (!exist)
 584		return;
 585
 586	/* allocation needs to be contiguous with the existing namespace */
 587	if (valid->start == exist->end + 1
 588			|| valid->end == exist->start - 1)
 589		return;
 590
 591 invalid:
 592	/* truncate @valid size to 0 */
 593	valid->end = valid->start - 1;
 594}
 595
 596enum alloc_loc {
 597	ALLOC_ERR = 0, ALLOC_BEFORE, ALLOC_MID, ALLOC_AFTER,
 598};
 599
 600static resource_size_t scan_allocate(struct nd_region *nd_region,
 601		struct nd_mapping *nd_mapping, struct nd_label_id *label_id,
 602		resource_size_t n)
 603{
 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;
 609	int first;
 610
 611	for_each_dpa_resource(ndd, res)
 612		if (strcmp(label_id->id, res->name) == 0)
 613			exist = res;
 614
 615	valid.start = nd_mapping->start;
 616	valid.end = mapping_end;
 617	valid.name = "free space";
 618 retry:
 619	first = 0;
 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;
 624		const char *action;
 625		int rc = 0;
 626
 627		/* ignore resources outside this nd_mapping */
 628		if (res->start > mapping_end)
 629			continue;
 630		if (res->end < nd_mapping->start)
 631			continue;
 632
 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);
 640			if (available)
 641				loc = ALLOC_BEFORE;
 642		}
 643
 644		/* space between allocations */
 645		if (!loc && next) {
 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);
 651			if (available)
 652				loc = ALLOC_MID;
 653		}
 654
 655		/* space at the end of the mapping */
 656		if (!loc && !next) {
 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);
 662			if (available)
 663				loc = ALLOC_AFTER;
 664		}
 665
 666		if (!loc || !available)
 667			continue;
 668		allocate = min(available, n);
 669		switch (loc) {
 670		case ALLOC_BEFORE:
 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";
 676			} else
 677				action = "allocate";
 678			break;
 679		case ALLOC_MID:
 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)
 684						+ allocate);
 685				new_res = next;
 686				action = "next grow up";
 687			} else if (strcmp(res->name, label_id->id) == 0) {
 688				action = "grow down";
 689			} else
 690				action = "allocate";
 691			break;
 692		case ALLOC_AFTER:
 693			if (strcmp(res->name, label_id->id) == 0)
 694				action = "grow down";
 695			else
 696				action = "allocate";
 697			break;
 698		default:
 699			return n;
 700		}
 701
 702		if (strcmp(action, "allocate") == 0) {
 703			/* BLK allocate bottom up */
 704			if (!is_pmem)
 705				valid.start += available - allocate;
 706
 707			new_res = nvdimm_allocate_dpa(ndd, label_id,
 708					valid.start, allocate);
 709			if (!new_res)
 710				rc = -EBUSY;
 711		} else if (strcmp(action, "grow down") == 0) {
 712			/* adjust current resource down */
 713			rc = adjust_resource(res, res->start, resource_size(res)
 714					+ allocate);
 715			if (rc == 0)
 716				res->flags |= DPA_RESOURCE_ADJUSTED;
 717		}
 718
 719		if (!new_res)
 720			new_res = res;
 721
 722		nd_dbg_dpa(nd_region, ndd, new_res, "%s(%d) %d\n",
 723				action, loc, rc);
 724
 725		if (rc)
 726			return n;
 727
 728		n -= allocate;
 729		if (n) {
 730			/*
 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
 736			 */
 737			goto retry;
 738		} else
 739			return 0;
 740	}
 741
 742	/*
 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.
 746	 */
 747	if ((is_pmem || !ndd->dpa.child) && n == to_allocate)
 748		return init_dpa_allocation(label_id, nd_region, nd_mapping, n);
 749	return n;
 750}
 751
 752static int merge_dpa(struct nd_region *nd_region,
 753		struct nd_mapping *nd_mapping, struct nd_label_id *label_id)
 754{
 755	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 756	struct resource *res;
 757
 758	if (strncmp("pmem", label_id->id, 4) == 0)
 759		return 0;
 760 retry:
 761	for_each_dpa_resource(ndd, res) {
 762		int rc;
 763		struct resource *next = res->sibling;
 764		resource_size_t end = res->start + resource_size(res);
 765
 766		if (!next || strcmp(res->name, label_id->id) != 0
 767				|| strcmp(next->name, label_id->id) != 0
 768				|| end != next->start)
 769			continue;
 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);
 774		if (rc)
 775			return rc;
 776		res->flags |= DPA_RESOURCE_ADJUSTED;
 777		goto retry;
 778	}
 779
 780	return 0;
 781}
 782
 783static int __reserve_free_pmem(struct device *dev, void *data)
 784{
 785	struct nvdimm *nvdimm = data;
 786	struct nd_region *nd_region;
 787	struct nd_label_id label_id;
 788	int i;
 789
 790	if (!is_nd_pmem(dev))
 791		return 0;
 792
 793	nd_region = to_nd_region(dev);
 794	if (nd_region->ndr_mappings == 0)
 795		return 0;
 796
 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;
 802
 803		if (nd_mapping->nvdimm != nvdimm)
 804			continue;
 805
 806		n = nd_pmem_available_dpa(nd_region, nd_mapping, &rem);
 807		if (n == 0)
 808			return 0;
 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;
 815	}
 816
 817	return 0;
 818}
 819
 820static void release_free_pmem(struct nvdimm_bus *nvdimm_bus,
 821		struct nd_mapping *nd_mapping)
 822{
 823	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
 824	struct resource *res, *_res;
 825
 826	for_each_dpa_resource_safe(ndd, res, _res)
 827		if (strcmp(res->name, "pmem-reserve") == 0)
 828			nvdimm_free_dpa(ndd, res);
 829}
 830
 831static int reserve_free_pmem(struct nvdimm_bus *nvdimm_bus,
 832		struct nd_mapping *nd_mapping)
 833{
 834	struct nvdimm *nvdimm = nd_mapping->nvdimm;
 835	int rc;
 836
 837	rc = device_for_each_child(&nvdimm_bus->dev, nvdimm,
 838			__reserve_free_pmem);
 839	if (rc)
 840		release_free_pmem(nvdimm_bus, nd_mapping);
 841	return rc;
 842}
 843
 844/**
 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
 849 *
 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
 855 * first.
 856 */
 857static int grow_dpa_allocation(struct nd_region *nd_region,
 858		struct nd_label_id *label_id, resource_size_t n)
 859{
 860	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
 861	bool is_pmem = strncmp(label_id->id, "pmem", 4) == 0;
 862	int i;
 863
 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;
 867		int rc, j;
 868
 869		/*
 870		 * In the BLK case try once with all unallocated PMEM
 871		 * reserved, and once without
 872		 */
 873		for (j = is_pmem; j < 2; j++) {
 874			bool blk_only = j == 0;
 875
 876			if (blk_only) {
 877				rc = reserve_free_pmem(nvdimm_bus, nd_mapping);
 878				if (rc)
 879					return rc;
 880			}
 881			rem = scan_allocate(nd_region, nd_mapping,
 882					label_id, rem);
 883			if (blk_only)
 884				release_free_pmem(nvdimm_bus, nd_mapping);
 885
 886			/* try again and allow encroachments into PMEM */
 887			if (rem == 0)
 888				break;
 889		}
 890
 
 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);
 895		if (rem)
 896			return -ENXIO;
 897
 898		rc = merge_dpa(nd_region, nd_mapping, label_id);
 899		if (rc)
 900			return rc;
 901	}
 902
 903	return 0;
 904}
 905
 906static void nd_namespace_pmem_set_resource(struct nd_region *nd_region,
 907		struct nd_namespace_pmem *nspm, resource_size_t size)
 908{
 909	struct resource *res = &nspm->nsio.res;
 910	resource_size_t offset = 0;
 911
 912	if (size && !nspm->uuid) {
 913		WARN_ON_ONCE(1);
 914		size = 0;
 915	}
 916
 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;
 922
 923		if (!ndd) {
 924			size = 0;
 925			goto out;
 926		}
 927
 928		nd_label_gen_id(&label_id, nspm->uuid, 0);
 929
 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;
 935				goto out;
 936			}
 937
 938		WARN_ON_ONCE(1);
 939		size = 0;
 940	}
 941
 942 out:
 943	res->start = nd_region->ndr_start + offset;
 944	res->end = res->start + size - 1;
 945}
 946
 947static bool uuid_not_set(const u8 *uuid, struct device *dev, const char *where)
 
 948{
 949	if (!uuid) {
 950		dev_dbg(dev, "%s: uuid not set\n", where);
 951		return true;
 952	}
 953	return false;
 954}
 955
 956static ssize_t __size_store(struct device *dev, unsigned long long val)
 957{
 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;
 965	int rc, i, id = -1;
 966	u8 *uuid = NULL;
 967
 968	if (dev->driver || ndns->claim)
 969		return -EBUSY;
 970
 971	if (is_namespace_pmem(dev)) {
 972		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
 973
 974		uuid = nspm->uuid;
 975		id = nspm->id;
 976	} else if (is_namespace_blk(dev)) {
 977		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
 978
 979		uuid = nsblk->uuid;
 980		flags = NSLABEL_FLAG_LOCAL;
 981		id = nsblk->id;
 982	}
 983
 984	/*
 985	 * We need a uuid for the allocation-label and dimm(s) on which
 986	 * to store the label.
 987	 */
 988	if (uuid_not_set(uuid, dev, __func__))
 989		return -ENXIO;
 990	if (nd_region->ndr_mappings == 0) {
 991		dev_dbg(dev, "%s: not associated with dimm(s)\n", __func__);
 992		return -ENXIO;
 993	}
 994
 995	div_u64_rem(val, SZ_4K * nd_region->ndr_mappings, &remainder);
 996	if (remainder) {
 997		dev_dbg(dev, "%llu is not %dK aligned\n", val,
 998				(SZ_4K * nd_region->ndr_mappings) / SZ_1K);
 999		return -EINVAL;
1000	}
1001
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);
1006
1007		/*
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.
1010		 */
1011		if (!ndd)
1012			return -ENXIO;
1013
1014		allocated += nvdimm_allocated_dpa(ndd, &label_id);
1015	}
1016	available = nd_region_available_dpa(nd_region);
1017
1018	if (val > available + allocated)
1019		return -ENOSPC;
1020
1021	if (val == allocated)
1022		return 0;
1023
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,
1028				allocated - val);
1029	else
1030		rc = grow_dpa_allocation(nd_region, &label_id, val - allocated);
1031
1032	if (rc)
1033		return rc;
1034
1035	if (is_namespace_pmem(dev)) {
1036		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1037
1038		nd_namespace_pmem_set_resource(nd_region, nspm,
1039				val * nd_region->ndr_mappings);
1040	}
1041
1042	/*
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
1046	 * instance.
1047	 */
1048	if (val == 0 && id != 0 && nd_region->ns_seed != dev && !ndns->claim)
1049		nd_device_unregister(dev, ND_ASYNC);
1050
1051	return rc;
1052}
1053
1054static ssize_t size_store(struct device *dev,
1055		struct device_attribute *attr, const char *buf, size_t len)
1056{
1057	struct nd_region *nd_region = to_nd_region(dev->parent);
1058	unsigned long long val;
1059	u8 **uuid = NULL;
1060	int rc;
1061
1062	rc = kstrtoull(buf, 0, &val);
1063	if (rc)
1064		return rc;
1065
1066	device_lock(dev);
1067	nvdimm_bus_lock(dev);
1068	wait_nvdimm_bus_probe_idle(dev);
1069	rc = __size_store(dev, val);
1070	if (rc >= 0)
1071		rc = nd_namespace_label_update(nd_region, dev);
1072
1073	if (is_namespace_pmem(dev)) {
 
1074		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1075
1076		uuid = &nspm->uuid;
1077	} else if (is_namespace_blk(dev)) {
1078		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1079
1080		uuid = &nsblk->uuid;
1081	}
1082
1083	if (rc == 0 && val == 0 && uuid) {
1084		/* setting size zero == 'delete namespace' */
1085		kfree(*uuid);
1086		*uuid = NULL;
1087	}
1088
1089	dev_dbg(dev, "%s: %llx %s (%d)\n", __func__, val, rc < 0
1090			? "fail" : "success", rc);
1091
1092	nvdimm_bus_unlock(dev);
1093	device_unlock(dev);
1094
1095	return rc < 0 ? rc : len;
1096}
1097
1098resource_size_t __nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
1099{
1100	struct device *dev = &ndns->dev;
1101
1102	if (is_namespace_pmem(dev)) {
1103		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1104
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);
1110
1111		return resource_size(&nsio->res);
1112	} else
1113		WARN_ONCE(1, "unknown namespace type\n");
1114	return 0;
1115}
1116
1117resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns)
1118{
1119	resource_size_t size;
1120
1121	nvdimm_bus_lock(&ndns->dev);
1122	size = __nvdimm_namespace_capacity(ndns);
1123	nvdimm_bus_unlock(&ndns->dev);
1124
1125	return size;
1126}
1127EXPORT_SYMBOL(nvdimm_namespace_capacity);
1128
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1129static ssize_t size_show(struct device *dev,
1130		struct device_attribute *attr, char *buf)
1131{
1132	return sprintf(buf, "%llu\n", (unsigned long long)
1133			nvdimm_namespace_capacity(to_ndns(dev)));
1134}
1135static DEVICE_ATTR(size, 0444, size_show, size_store);
1136
1137static u8 *namespace_to_uuid(struct device *dev)
1138{
1139	if (is_namespace_pmem(dev)) {
1140		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1141
1142		return nspm->uuid;
1143	} else if (is_namespace_blk(dev)) {
1144		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1145
1146		return nsblk->uuid;
1147	} else
1148		return ERR_PTR(-ENXIO);
1149}
1150
1151static ssize_t uuid_show(struct device *dev,
1152		struct device_attribute *attr, char *buf)
1153{
1154	u8 *uuid = namespace_to_uuid(dev);
1155
1156	if (IS_ERR(uuid))
1157		return PTR_ERR(uuid);
1158	if (uuid)
1159		return sprintf(buf, "%pUb\n", uuid);
1160	return sprintf(buf, "\n");
1161}
1162
1163/**
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
1169 */
1170static int namespace_update_uuid(struct nd_region *nd_region,
1171		struct device *dev, u8 *new_uuid, u8 **old_uuid)
 
1172{
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;
1176	int i;
1177
1178	if (!nd_is_uuid_unique(dev, new_uuid))
1179		return -EINVAL;
1180
1181	if (*old_uuid == NULL)
1182		goto out;
1183
1184	/*
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.
1189	 */
1190	for (i = 0; i < nd_region->ndr_mappings; i++) {
1191		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
1192
1193		/*
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.
1197		 *
1198		 * FIXME: can we delete uuid with zero dpa allocated?
1199		 */
1200		if (list_empty(&nd_mapping->labels))
1201			return -EBUSY;
1202	}
1203
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;
1210
1211		for_each_dpa_resource(ndd, res)
1212			if (strcmp(res->name, old_label_id.id) == 0)
1213				sprintf((void *) res->name, "%s",
1214						new_label_id.id);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1215	}
1216	kfree(*old_uuid);
1217 out:
1218	*old_uuid = new_uuid;
1219	return 0;
1220}
1221
1222static ssize_t uuid_store(struct device *dev,
1223		struct device_attribute *attr, const char *buf, size_t len)
1224{
1225	struct nd_region *nd_region = to_nd_region(dev->parent);
1226	u8 *uuid = NULL;
 
1227	ssize_t rc = 0;
1228	u8 **ns_uuid;
1229
1230	if (is_namespace_pmem(dev)) {
1231		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1232
1233		ns_uuid = &nspm->uuid;
1234	} else if (is_namespace_blk(dev)) {
1235		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1236
1237		ns_uuid = &nsblk->uuid;
1238	} else
1239		return -ENXIO;
1240
1241	device_lock(dev);
1242	nvdimm_bus_lock(dev);
1243	wait_nvdimm_bus_probe_idle(dev);
1244	if (to_ndns(dev)->claim)
1245		rc = -EBUSY;
1246	if (rc >= 0)
1247		rc = nd_uuid_store(dev, &uuid, buf, len);
1248	if (rc >= 0)
1249		rc = namespace_update_uuid(nd_region, dev, uuid, ns_uuid);
1250	if (rc >= 0)
1251		rc = nd_namespace_label_update(nd_region, dev);
1252	else
1253		kfree(uuid);
1254	dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
1255			rc, buf, buf[len - 1] == '\n' ? "" : "\n");
1256	nvdimm_bus_unlock(dev);
1257	device_unlock(dev);
1258
1259	return rc < 0 ? rc : len;
1260}
1261static DEVICE_ATTR_RW(uuid);
1262
1263static ssize_t resource_show(struct device *dev,
1264		struct device_attribute *attr, char *buf)
1265{
1266	struct resource *res;
1267
1268	if (is_namespace_pmem(dev)) {
1269		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1270
1271		res = &nspm->nsio.res;
1272	} else if (is_namespace_io(dev)) {
1273		struct nd_namespace_io *nsio = to_nd_namespace_io(dev);
1274
1275		res = &nsio->res;
1276	} else
1277		return -ENXIO;
1278
1279	/* no address to convey if the namespace has no allocation */
1280	if (resource_size(res) == 0)
1281		return -ENXIO;
1282	return sprintf(buf, "%#llx\n", (unsigned long long) res->start);
1283}
1284static DEVICE_ATTR_RO(resource);
1285
1286static const unsigned long ns_lbasize_supported[] = { 512, 520, 528,
1287	4096, 4104, 4160, 4224, 0 };
1288
1289static ssize_t sector_size_show(struct device *dev,
1290		struct device_attribute *attr, char *buf)
1291{
1292	struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1293
1294	if (!is_namespace_blk(dev))
1295		return -ENXIO;
1296
1297	return nd_sector_size_show(nsblk->lbasize, ns_lbasize_supported, buf);
 
 
 
1298}
1299
1300static ssize_t sector_size_store(struct device *dev,
1301		struct device_attribute *attr, const char *buf, size_t len)
1302{
1303	struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1304	struct nd_region *nd_region = to_nd_region(dev->parent);
 
 
1305	ssize_t rc = 0;
1306
1307	if (!is_namespace_blk(dev))
 
 
 
 
 
1308		return -ENXIO;
1309
1310	device_lock(dev);
1311	nvdimm_bus_lock(dev);
1312	if (to_ndns(dev)->claim)
1313		rc = -EBUSY;
1314	if (rc >= 0)
1315		rc = nd_sector_size_store(dev, buf, &nsblk->lbasize,
1316				ns_lbasize_supported);
1317	if (rc >= 0)
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);
1323	device_unlock(dev);
1324
1325	return rc ? rc : len;
1326}
1327static DEVICE_ATTR_RW(sector_size);
1328
1329static ssize_t dpa_extents_show(struct device *dev,
1330		struct device_attribute *attr, char *buf)
1331{
1332	struct nd_region *nd_region = to_nd_region(dev->parent);
1333	struct nd_label_id label_id;
 
1334	int count = 0, i;
1335	u8 *uuid = NULL;
1336	u32 flags = 0;
1337
1338	nvdimm_bus_lock(dev);
1339	if (is_namespace_pmem(dev)) {
1340		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);
1341
1342		uuid = nspm->uuid;
1343		flags = 0;
1344	} else if (is_namespace_blk(dev)) {
1345		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);
1346
1347		uuid = nsblk->uuid;
1348		flags = NSLABEL_FLAG_LOCAL;
1349	}
1350
1351	if (!uuid)
1352		goto out;
1353
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;
1359
1360		for_each_dpa_resource(ndd, res)
1361			if (strcmp(res->name, label_id.id) == 0)
1362				count++;
1363	}
1364 out:
1365	nvdimm_bus_unlock(dev);
1366
1367	return sprintf(buf, "%d\n", count);
1368}
1369static DEVICE_ATTR_RO(dpa_extents);
1370
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1371static ssize_t holder_show(struct device *dev,
1372		struct device_attribute *attr, char *buf)
1373{
1374	struct nd_namespace_common *ndns = to_ndns(dev);
1375	ssize_t rc;
1376
1377	device_lock(dev);
1378	rc = sprintf(buf, "%s\n", ndns->claim ? dev_name(ndns->claim) : "");
1379	device_unlock(dev);
1380
1381	return rc;
1382}
1383static DEVICE_ATTR_RO(holder);
1384
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1385static ssize_t mode_show(struct device *dev,
1386		struct device_attribute *attr, char *buf)
1387{
1388	struct nd_namespace_common *ndns = to_ndns(dev);
1389	struct device *claim;
1390	char *mode;
1391	ssize_t rc;
1392
1393	device_lock(dev);
1394	claim = ndns->claim;
1395	if (claim && is_nd_btt(claim))
1396		mode = "safe";
1397	else if (claim && is_nd_pfn(claim))
1398		mode = "memory";
1399	else if (claim && is_nd_dax(claim))
1400		mode = "dax";
1401	else if (!claim && pmem_should_map_pages(dev))
1402		mode = "memory";
1403	else
1404		mode = "raw";
1405	rc = sprintf(buf, "%s\n", mode);
1406	device_unlock(dev);
1407
1408	return rc;
1409}
1410static DEVICE_ATTR_RO(mode);
1411
1412static ssize_t force_raw_store(struct device *dev,
1413		struct device_attribute *attr, const char *buf, size_t len)
1414{
1415	bool force_raw;
1416	int rc = strtobool(buf, &force_raw);
1417
1418	if (rc)
1419		return rc;
1420
1421	to_ndns(dev)->force_raw = force_raw;
1422	return len;
1423}
1424
1425static ssize_t force_raw_show(struct device *dev,
1426		struct device_attribute *attr, char *buf)
1427{
1428	return sprintf(buf, "%d\n", to_ndns(dev)->force_raw);
1429}
1430static DEVICE_ATTR_RW(force_raw);
1431
1432static 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,
 
1443	NULL,
1444};
1445
1446static umode_t namespace_visible(struct kobject *kobj,
1447		struct attribute *a, int n)
1448{
1449	struct device *dev = container_of(kobj, struct device, kobj);
1450
1451	if (a == &dev_attr_resource.attr) {
1452		if (is_namespace_blk(dev))
1453			return 0;
1454		return a->mode;
1455	}
1456
1457	if (is_namespace_pmem(dev) || is_namespace_blk(dev)) {
1458		if (a == &dev_attr_size.attr)
1459			return 0644;
1460
1461		if (is_namespace_pmem(dev) && a == &dev_attr_sector_size.attr)
1462			return 0;
1463
1464		return a->mode;
1465	}
1466
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)
 
1471		return a->mode;
1472
1473	return 0;
1474}
1475
1476static struct attribute_group nd_namespace_attribute_group = {
1477	.attrs = nd_namespace_attributes,
1478	.is_visible = namespace_visible,
1479};
1480
1481static const struct attribute_group *nd_namespace_attribute_groups[] = {
1482	&nd_device_attribute_group,
1483	&nd_namespace_attribute_group,
1484	&nd_numa_attribute_group,
1485	NULL,
1486};
1487
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1488struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev)
1489{
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;
1495
1496	if (nd_btt || nd_pfn || nd_dax) {
1497		if (nd_btt)
1498			ndns = nd_btt->ndns;
1499		else if (nd_pfn)
1500			ndns = nd_pfn->ndns;
1501		else if (nd_dax)
1502			ndns = nd_dax->nd_pfn.ndns;
1503
1504		if (!ndns)
1505			return ERR_PTR(-ENODEV);
1506
1507		/*
1508		 * Flush any in-progess probes / removals in the driver
1509		 * for the raw personality of this namespace.
1510		 */
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",
1515					dev_name(dev));
1516			return ERR_PTR(-EBUSY);
1517		}
1518		if (dev_WARN_ONCE(&ndns->dev, ndns->claim != dev,
1519					"host (%s) vs claim (%s) mismatch\n",
1520					dev_name(dev),
1521					dev_name(ndns->claim)))
1522			return ERR_PTR(-ENXIO);
1523	} else {
1524		ndns = to_ndns(dev);
1525		if (ndns->claim) {
1526			dev_dbg(dev, "claimed by %s, failing probe\n",
1527				dev_name(ndns->claim));
1528
1529			return ERR_PTR(-ENXIO);
1530		}
1531	}
1532
 
 
 
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);
1538	}
1539
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1540	if (is_namespace_pmem(&ndns->dev)) {
1541		struct nd_namespace_pmem *nspm;
1542
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;
1548
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",
1554				__func__);
1555			return ERR_PTR(-ENODEV);
1556		}
1557		if (!nd_namespace_blk_validate(nsblk))
1558			return ERR_PTR(-ENODEV);
1559	}
1560
1561	return ndns;
1562}
1563EXPORT_SYMBOL(nvdimm_namespace_common_probe);
1564
 
 
 
 
 
 
 
 
 
 
 
 
 
1565static struct device **create_namespace_io(struct nd_region *nd_region)
1566{
1567	struct nd_namespace_io *nsio;
1568	struct device *dev, **devs;
1569	struct resource *res;
1570
1571	nsio = kzalloc(sizeof(*nsio), GFP_KERNEL);
1572	if (!nsio)
1573		return NULL;
1574
1575	devs = kcalloc(2, sizeof(struct device *), GFP_KERNEL);
1576	if (!devs) {
1577		kfree(nsio);
1578		return NULL;
1579	}
1580
1581	dev = &nsio->common.dev;
1582	dev->type = &namespace_io_device_type;
1583	dev->parent = &nd_region->dev;
1584	res = &nsio->res;
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;
1589
1590	devs[0] = dev;
1591	return devs;
1592}
1593
1594static bool has_uuid_at_pos(struct nd_region *nd_region, u8 *uuid,
1595		u64 cookie, u16 pos)
1596{
1597	struct nd_namespace_label *found = NULL;
1598	int i;
1599
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;
1604
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;
1608			u64 isetcookie;
1609
1610			if (!nd_label)
1611				continue;
1612			isetcookie = __le64_to_cpu(nd_label->isetcookie);
1613			position = __le16_to_cpu(nd_label->position);
1614			nlabel = __le16_to_cpu(nd_label->nlabel);
 
1615
1616			if (isetcookie != cookie)
1617				continue;
1618
1619			if (memcmp(nd_label->uuid, uuid, NSLABEL_UUID_LEN) != 0)
 
1620				continue;
1621
1622			if (found_uuid) {
1623				dev_dbg(to_ndd(nd_mapping)->dev,
1624						"%s duplicate entry for uuid\n",
1625						__func__);
1626				return false;
1627			}
1628			found_uuid = true;
1629			if (nlabel != nd_region->ndr_mappings)
1630				continue;
1631			if (position != pos)
1632				continue;
1633			found = nd_label;
1634			break;
1635		}
1636		if (found)
1637			break;
1638	}
1639	return found != NULL;
1640}
1641
1642static int select_pmem_id(struct nd_region *nd_region, u8 *pmem_id)
1643{
1644	int i;
1645
1646	if (!pmem_id)
1647		return -ENODEV;
1648
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;
1655
1656		lockdep_assert_held(&nd_mapping->lock);
1657		list_for_each_entry(label_ent, &nd_mapping->labels, list) {
1658			nd_label = label_ent->label;
1659			if (!nd_label)
1660				continue;
1661			if (memcmp(nd_label->uuid, pmem_id, NSLABEL_UUID_LEN) == 0)
1662				break;
1663			nd_label = NULL;
1664		}
1665
1666		if (!nd_label) {
1667			WARN_ON(1);
1668			return -EINVAL;
1669		}
1670
1671		/*
1672		 * Check that this label is compliant with the dpa
1673		 * range published in NFIT
1674		 */
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)
1681			/* pass */;
1682		else {
1683			dev_dbg(&nd_region->dev, "%s invalid label for %pUb\n",
1684					dev_name(ndd->dev), nd_label->uuid);
 
1685			return -EINVAL;
1686		}
1687
1688		/* move recently validated label to the front of the list */
1689		list_move(&label_ent->list, &nd_mapping->labels);
1690	}
1691	return 0;
1692}
1693
1694/**
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
1699 */
1700struct device *create_namespace_pmem(struct nd_region *nd_region,
1701		struct nd_namespace_label *nd_label)
 
1702{
 
 
 
 
1703	u64 altcookie = nd_region_interleave_set_altcookie(nd_region);
1704	u64 cookie = nd_region_interleave_set_cookie(nd_region);
1705	struct nd_label_ent *label_ent;
1706	struct nd_namespace_pmem *nspm;
1707	struct nd_mapping *nd_mapping;
1708	resource_size_t size = 0;
1709	struct resource *res;
1710	struct device *dev;
 
1711	int rc = 0;
1712	u16 i;
1713
1714	if (cookie == 0) {
1715		dev_dbg(&nd_region->dev, "invalid interleave-set-cookie\n");
1716		return ERR_PTR(-ENXIO);
1717	}
1718
1719	if (__le64_to_cpu(nd_label->isetcookie) != cookie) {
1720		dev_dbg(&nd_region->dev, "invalid cookie in label: %pUb\n",
1721				nd_label->uuid);
1722		if (__le64_to_cpu(nd_label->isetcookie) != altcookie)
1723			return ERR_PTR(-EAGAIN);
1724
1725		dev_dbg(&nd_region->dev, "valid altcookie in label: %pUb\n",
1726				nd_label->uuid);
1727	}
1728
1729	nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
1730	if (!nspm)
1731		return ERR_PTR(-ENOMEM);
1732
1733	nspm->id = -1;
1734	dev = &nspm->nsio.common.dev;
1735	dev->type = &namespace_pmem_device_type;
1736	dev->parent = &nd_region->dev;
1737	res = &nspm->nsio.res;
1738	res->name = dev_name(&nd_region->dev);
1739	res->flags = IORESOURCE_MEM;
1740
1741	for (i = 0; i < nd_region->ndr_mappings; i++) {
1742		if (has_uuid_at_pos(nd_region, nd_label->uuid, cookie, i))
 
1743			continue;
1744		if (has_uuid_at_pos(nd_region, nd_label->uuid, altcookie, i))
1745			continue;
1746		break;
1747	}
1748
1749	if (i < nd_region->ndr_mappings) {
1750		struct nvdimm_drvdata *ndd = to_ndd(&nd_region->mapping[i]);
1751
1752		/*
1753		 * Give up if we don't find an instance of a uuid at each
1754		 * position (from 0 to nd_region->ndr_mappings - 1), or if we
1755		 * find a dimm with two instances of the same uuid.
1756		 */
1757		dev_err(&nd_region->dev, "%s missing label for %pUb\n",
1758				dev_name(ndd->dev), nd_label->uuid);
1759		rc = -EINVAL;
1760		goto err;
1761	}
1762
1763	/*
1764	 * Fix up each mapping's 'labels' to have the validated pmem label for
1765	 * that position at labels[0], and NULL at labels[1].  In the process,
1766	 * check that the namespace aligns with interleave-set.  We know
1767	 * that it does not overlap with any blk namespaces by virtue of
1768	 * the dimm being enabled (i.e. nd_label_reserve_dpa()
1769	 * succeeded).
1770	 */
1771	rc = select_pmem_id(nd_region, nd_label->uuid);
 
1772	if (rc)
1773		goto err;
1774
1775	/* Calculate total size and populate namespace properties from label0 */
1776	for (i = 0; i < nd_region->ndr_mappings; i++) {
1777		struct nd_namespace_label *label0;
 
1778
1779		nd_mapping = &nd_region->mapping[i];
1780		label_ent = list_first_entry_or_null(&nd_mapping->labels,
1781				typeof(*label_ent), list);
1782		label0 = label_ent ? label_ent->label : 0;
1783
1784		if (!label0) {
1785			WARN_ON(1);
1786			continue;
1787		}
1788
1789		size += __le64_to_cpu(label0->rawsize);
1790		if (__le16_to_cpu(label0->position) != 0)
 
1791			continue;
1792		WARN_ON(nspm->alt_name || nspm->uuid);
1793		nspm->alt_name = kmemdup((void __force *) label0->name,
1794				NSLABEL_NAME_LEN, GFP_KERNEL);
1795		nspm->uuid = kmemdup((void __force *) label0->uuid,
1796				NSLABEL_UUID_LEN, GFP_KERNEL);
 
 
 
1797	}
1798
1799	if (!nspm->alt_name || !nspm->uuid) {
1800		rc = -ENOMEM;
1801		goto err;
1802	}
1803
1804	nd_namespace_pmem_set_resource(nd_region, nspm, size);
1805
1806	return dev;
1807 err:
1808	namespace_pmem_release(dev);
1809	switch (rc) {
1810	case -EINVAL:
1811		dev_dbg(&nd_region->dev, "%s: invalid label(s)\n", __func__);
1812		break;
1813	case -ENODEV:
1814		dev_dbg(&nd_region->dev, "%s: label not found\n", __func__);
1815		break;
1816	default:
1817		dev_dbg(&nd_region->dev, "%s: unexpected err: %d\n",
1818				__func__, rc);
1819		break;
1820	}
1821	return ERR_PTR(rc);
1822}
1823
1824struct resource *nsblk_add_resource(struct nd_region *nd_region,
1825		struct nvdimm_drvdata *ndd, struct nd_namespace_blk *nsblk,
1826		resource_size_t start)
1827{
1828	struct nd_label_id label_id;
1829	struct resource *res;
1830
1831	nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
1832	res = krealloc(nsblk->res,
1833			sizeof(void *) * (nsblk->num_resources + 1),
1834			GFP_KERNEL);
1835	if (!res)
1836		return NULL;
1837	nsblk->res = (struct resource **) res;
1838	for_each_dpa_resource(ndd, res)
1839		if (strcmp(res->name, label_id.id) == 0
1840				&& res->start == start) {
1841			nsblk->res[nsblk->num_resources++] = res;
1842			return res;
1843		}
1844	return NULL;
1845}
1846
1847static struct device *nd_namespace_blk_create(struct nd_region *nd_region)
1848{
1849	struct nd_namespace_blk *nsblk;
1850	struct device *dev;
1851
1852	if (!is_nd_blk(&nd_region->dev))
1853		return NULL;
1854
1855	nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
1856	if (!nsblk)
1857		return NULL;
1858
1859	dev = &nsblk->common.dev;
1860	dev->type = &namespace_blk_device_type;
1861	nsblk->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL);
1862	if (nsblk->id < 0) {
1863		kfree(nsblk);
1864		return NULL;
1865	}
1866	dev_set_name(dev, "namespace%d.%d", nd_region->id, nsblk->id);
1867	dev->parent = &nd_region->dev;
1868	dev->groups = nd_namespace_attribute_groups;
1869
1870	return &nsblk->common.dev;
1871}
1872
1873static struct device *nd_namespace_pmem_create(struct nd_region *nd_region)
1874{
1875	struct nd_namespace_pmem *nspm;
1876	struct resource *res;
1877	struct device *dev;
1878
1879	if (!is_nd_pmem(&nd_region->dev))
1880		return NULL;
1881
1882	nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
1883	if (!nspm)
1884		return NULL;
1885
1886	dev = &nspm->nsio.common.dev;
1887	dev->type = &namespace_pmem_device_type;
1888	dev->parent = &nd_region->dev;
1889	res = &nspm->nsio.res;
1890	res->name = dev_name(&nd_region->dev);
1891	res->flags = IORESOURCE_MEM;
1892
1893	nspm->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL);
1894	if (nspm->id < 0) {
1895		kfree(nspm);
1896		return NULL;
1897	}
1898	dev_set_name(dev, "namespace%d.%d", nd_region->id, nspm->id);
1899	dev->parent = &nd_region->dev;
1900	dev->groups = nd_namespace_attribute_groups;
1901	nd_namespace_pmem_set_resource(nd_region, nspm, 0);
1902
1903	return dev;
1904}
1905
 
 
1906void nd_region_create_ns_seed(struct nd_region *nd_region)
1907{
1908	WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
1909
1910	if (nd_region_to_nstype(nd_region) == ND_DEVICE_NAMESPACE_IO)
1911		return;
1912
1913	if (is_nd_blk(&nd_region->dev))
1914		nd_region->ns_seed = nd_namespace_blk_create(nd_region);
1915	else
1916		nd_region->ns_seed = nd_namespace_pmem_create(nd_region);
1917
1918	/*
1919	 * Seed creation failures are not fatal, provisioning is simply
1920	 * disabled until memory becomes available
1921	 */
1922	if (!nd_region->ns_seed)
1923		dev_err(&nd_region->dev, "failed to create %s namespace\n",
1924				is_nd_blk(&nd_region->dev) ? "blk" : "pmem");
1925	else
 
 
1926		nd_device_register(nd_region->ns_seed);
 
1927}
1928
1929void nd_region_create_dax_seed(struct nd_region *nd_region)
1930{
1931	WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
1932	nd_region->dax_seed = nd_dax_create(nd_region);
1933	/*
1934	 * Seed creation failures are not fatal, provisioning is simply
1935	 * disabled until memory becomes available
1936	 */
1937	if (!nd_region->dax_seed)
1938		dev_err(&nd_region->dev, "failed to create dax namespace\n");
1939}
1940
1941void nd_region_create_pfn_seed(struct nd_region *nd_region)
1942{
1943	WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
1944	nd_region->pfn_seed = nd_pfn_create(nd_region);
1945	/*
1946	 * Seed creation failures are not fatal, provisioning is simply
1947	 * disabled until memory becomes available
1948	 */
1949	if (!nd_region->pfn_seed)
1950		dev_err(&nd_region->dev, "failed to create pfn namespace\n");
1951}
1952
1953void nd_region_create_btt_seed(struct nd_region *nd_region)
1954{
1955	WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));
1956	nd_region->btt_seed = nd_btt_create(nd_region);
1957	/*
1958	 * Seed creation failures are not fatal, provisioning is simply
1959	 * disabled until memory becomes available
1960	 */
1961	if (!nd_region->btt_seed)
1962		dev_err(&nd_region->dev, "failed to create btt namespace\n");
1963}
1964
1965static int add_namespace_resource(struct nd_region *nd_region,
1966		struct nd_namespace_label *nd_label, struct device **devs,
1967		int count)
1968{
1969	struct nd_mapping *nd_mapping = &nd_region->mapping[0];
1970	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
1971	int i;
1972
1973	for (i = 0; i < count; i++) {
1974		u8 *uuid = namespace_to_uuid(devs[i]);
1975		struct resource *res;
1976
1977		if (IS_ERR_OR_NULL(uuid)) {
1978			WARN_ON(1);
1979			continue;
1980		}
1981
1982		if (memcmp(uuid, nd_label->uuid, NSLABEL_UUID_LEN) != 0)
1983			continue;
1984		if (is_namespace_blk(devs[i])) {
1985			res = nsblk_add_resource(nd_region, ndd,
1986					to_nd_namespace_blk(devs[i]),
1987					__le64_to_cpu(nd_label->dpa));
1988			if (!res)
1989				return -ENXIO;
1990			nd_dbg_dpa(nd_region, ndd, res, "%d assign\n", count);
1991		} else {
1992			dev_err(&nd_region->dev,
1993					"error: conflicting extents for uuid: %pUb\n",
1994					nd_label->uuid);
1995			return -ENXIO;
1996		}
1997		break;
1998	}
1999
2000	return i;
2001}
2002
2003struct device *create_namespace_blk(struct nd_region *nd_region,
2004		struct nd_namespace_label *nd_label, int count)
2005{
2006
2007	struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2008	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2009	struct nd_namespace_blk *nsblk;
2010	char name[NSLABEL_NAME_LEN];
2011	struct device *dev = NULL;
2012	struct resource *res;
2013
2014	nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
2015	if (!nsblk)
2016		return ERR_PTR(-ENOMEM);
2017	dev = &nsblk->common.dev;
2018	dev->type = &namespace_blk_device_type;
2019	dev->parent = &nd_region->dev;
2020	nsblk->id = -1;
2021	nsblk->lbasize = __le64_to_cpu(nd_label->lbasize);
2022	nsblk->uuid = kmemdup(nd_label->uuid, NSLABEL_UUID_LEN,
2023			GFP_KERNEL);
2024	if (!nsblk->uuid)
2025		goto blk_err;
2026	memcpy(name, nd_label->name, NSLABEL_NAME_LEN);
2027	if (name[0])
2028		nsblk->alt_name = kmemdup(name, NSLABEL_NAME_LEN,
2029				GFP_KERNEL);
2030	res = nsblk_add_resource(nd_region, ndd, nsblk,
2031			__le64_to_cpu(nd_label->dpa));
2032	if (!res)
2033		goto blk_err;
2034	nd_dbg_dpa(nd_region, ndd, res, "%d: assign\n", count);
2035	return dev;
2036 blk_err:
2037	namespace_blk_release(dev);
2038	return ERR_PTR(-ENXIO);
2039}
2040
2041static int cmp_dpa(const void *a, const void *b)
2042{
2043	const struct device *dev_a = *(const struct device **) a;
2044	const struct device *dev_b = *(const struct device **) b;
2045	struct nd_namespace_blk *nsblk_a, *nsblk_b;
2046	struct nd_namespace_pmem *nspm_a, *nspm_b;
2047
2048	if (is_namespace_io(dev_a))
2049		return 0;
2050
2051	if (is_namespace_blk(dev_a)) {
2052		nsblk_a = to_nd_namespace_blk(dev_a);
2053		nsblk_b = to_nd_namespace_blk(dev_b);
2054
2055		return memcmp(&nsblk_a->res[0]->start, &nsblk_b->res[0]->start,
2056				sizeof(resource_size_t));
2057	}
2058
2059	nspm_a = to_nd_namespace_pmem(dev_a);
2060	nspm_b = to_nd_namespace_pmem(dev_b);
2061
2062	return memcmp(&nspm_a->nsio.res.start, &nspm_b->nsio.res.start,
2063			sizeof(resource_size_t));
2064}
2065
2066static struct device **scan_labels(struct nd_region *nd_region)
2067{
2068	int i, count = 0;
2069	struct device *dev, **devs = NULL;
2070	struct nd_label_ent *label_ent, *e;
2071	struct nd_mapping *nd_mapping = &nd_region->mapping[0];
 
2072	resource_size_t map_end = nd_mapping->start + nd_mapping->size - 1;
2073
2074	/* "safe" because create_namespace_pmem() might list_move() label_ent */
2075	list_for_each_entry_safe(label_ent, e, &nd_mapping->labels, list) {
2076		struct nd_namespace_label *nd_label = label_ent->label;
2077		struct device **__devs;
2078		u32 flags;
2079
2080		if (!nd_label)
2081			continue;
2082		flags = __le32_to_cpu(nd_label->flags);
2083		if (is_nd_blk(&nd_region->dev)
2084				== !!(flags & NSLABEL_FLAG_LOCAL))
2085			/* pass, region matches label type */;
2086		else
2087			continue;
2088
2089		/* skip labels that describe extents outside of the region */
2090		if (nd_label->dpa < nd_mapping->start || nd_label->dpa > map_end)
 
2091			continue;
2092
2093		i = add_namespace_resource(nd_region, nd_label, devs, count);
2094		if (i < 0)
2095			goto err;
2096		if (i < count)
2097			continue;
2098		__devs = kcalloc(count + 2, sizeof(dev), GFP_KERNEL);
2099		if (!__devs)
2100			goto err;
2101		memcpy(__devs, devs, sizeof(dev) * count);
2102		kfree(devs);
2103		devs = __devs;
2104
2105		if (is_nd_blk(&nd_region->dev)) {
2106			dev = create_namespace_blk(nd_region, nd_label, count);
2107			if (IS_ERR(dev))
 
 
 
 
 
 
 
2108				goto err;
 
 
2109			devs[count++] = dev;
2110		} else {
2111			dev = create_namespace_pmem(nd_region, nd_label);
2112			if (IS_ERR(dev)) {
2113				switch (PTR_ERR(dev)) {
2114				case -EAGAIN:
2115					/* skip invalid labels */
2116					continue;
2117				case -ENODEV:
2118					/* fallthrough to seed creation */
2119					break;
2120				default:
2121					goto err;
2122				}
2123			} else
2124				devs[count++] = dev;
2125		}
2126	}
2127
2128	dev_dbg(&nd_region->dev, "%s: discovered %d %s namespace%s\n",
2129			__func__, count, is_nd_blk(&nd_region->dev)
2130			? "blk" : "pmem", count == 1 ? "" : "s");
2131
2132	if (count == 0) {
 
 
2133		/* Publish a zero-sized namespace for userspace to configure. */
2134		nd_mapping_free_labels(nd_mapping);
2135
2136		devs = kcalloc(2, sizeof(dev), GFP_KERNEL);
2137		if (!devs)
2138			goto err;
2139		if (is_nd_blk(&nd_region->dev)) {
2140			struct nd_namespace_blk *nsblk;
2141
2142			nsblk = kzalloc(sizeof(*nsblk), GFP_KERNEL);
2143			if (!nsblk)
2144				goto err;
2145			dev = &nsblk->common.dev;
2146			dev->type = &namespace_blk_device_type;
2147		} else {
2148			struct nd_namespace_pmem *nspm;
2149
2150			nspm = kzalloc(sizeof(*nspm), GFP_KERNEL);
2151			if (!nspm)
2152				goto err;
2153			dev = &nspm->nsio.common.dev;
2154			dev->type = &namespace_pmem_device_type;
2155			nd_namespace_pmem_set_resource(nd_region, nspm, 0);
2156		}
2157		dev->parent = &nd_region->dev;
2158		devs[count++] = dev;
2159	} else if (is_nd_pmem(&nd_region->dev)) {
2160		/* clean unselected labels */
2161		for (i = 0; i < nd_region->ndr_mappings; i++) {
2162			struct list_head *l, *e;
2163			LIST_HEAD(list);
2164			int j;
2165
2166			nd_mapping = &nd_region->mapping[i];
2167			if (list_empty(&nd_mapping->labels)) {
2168				WARN_ON(1);
2169				continue;
2170			}
2171
2172			j = count;
2173			list_for_each_safe(l, e, &nd_mapping->labels) {
2174				if (!j--)
2175					break;
2176				list_move_tail(l, &list);
2177			}
2178			nd_mapping_free_labels(nd_mapping);
2179			list_splice_init(&list, &nd_mapping->labels);
2180		}
2181	}
2182
2183	if (count > 1)
2184		sort(devs, count, sizeof(struct device *), cmp_dpa, NULL);
2185
2186	return devs;
2187
2188 err:
2189	if (devs) {
2190		for (i = 0; devs[i]; i++)
2191			if (is_nd_blk(&nd_region->dev))
2192				namespace_blk_release(devs[i]);
2193			else
2194				namespace_pmem_release(devs[i]);
2195		kfree(devs);
2196	}
2197	return NULL;
2198}
2199
2200static struct device **create_namespaces(struct nd_region *nd_region)
2201{
2202	struct nd_mapping *nd_mapping = &nd_region->mapping[0];
2203	struct device **devs;
2204	int i;
2205
2206	if (nd_region->ndr_mappings == 0)
2207		return NULL;
2208
2209	/* lock down all mappings while we scan labels */
2210	for (i = 0; i < nd_region->ndr_mappings; i++) {
2211		nd_mapping = &nd_region->mapping[i];
2212		mutex_lock_nested(&nd_mapping->lock, i);
2213	}
2214
2215	devs = scan_labels(nd_region);
2216
2217	for (i = 0; i < nd_region->ndr_mappings; i++) {
2218		int reverse = nd_region->ndr_mappings - 1 - i;
2219
2220		nd_mapping = &nd_region->mapping[reverse];
2221		mutex_unlock(&nd_mapping->lock);
2222	}
2223
2224	return devs;
2225}
2226
2227static int init_active_labels(struct nd_region *nd_region)
2228{
 
2229	int i;
2230
2231	for (i = 0; i < nd_region->ndr_mappings; i++) {
2232		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2233		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
2234		struct nvdimm *nvdimm = nd_mapping->nvdimm;
2235		struct nd_label_ent *label_ent;
2236		int count, j;
2237
2238		/*
2239		 * If the dimm is disabled then prevent the region from
2240		 * being activated if it aliases DPA.
2241		 */
2242		if (!ndd) {
2243			if ((nvdimm->flags & NDD_ALIASING) == 0)
2244				return 0;
2245			dev_dbg(&nd_region->dev, "%s: is disabled, failing probe\n",
2246					dev_name(&nd_mapping->nvdimm->dev));
2247			return -ENXIO;
 
 
 
 
 
 
 
 
2248		}
2249		nd_mapping->ndd = ndd;
2250		atomic_inc(&nvdimm->busy);
2251		get_ndd(ndd);
2252
2253		count = nd_label_active_count(ndd);
2254		dev_dbg(ndd->dev, "%s: %d\n", __func__, count);
2255		if (!count)
2256			continue;
2257		for (j = 0; j < count; j++) {
2258			struct nd_namespace_label *label;
2259
2260			label_ent = kzalloc(sizeof(*label_ent), GFP_KERNEL);
2261			if (!label_ent)
2262				break;
2263			label = nd_label_active(ndd, j);
2264			label_ent->label = label;
2265
2266			mutex_lock(&nd_mapping->lock);
2267			list_add_tail(&label_ent->list, &nd_mapping->labels);
2268			mutex_unlock(&nd_mapping->lock);
2269		}
2270
2271		if (j >= count)
2272			continue;
 
2273
2274		mutex_lock(&nd_mapping->lock);
2275		nd_mapping_free_labels(nd_mapping);
2276		mutex_unlock(&nd_mapping->lock);
2277		return -ENOMEM;
 
 
 
2278	}
2279
2280	return 0;
 
2281}
2282
2283int nd_region_register_namespaces(struct nd_region *nd_region, int *err)
2284{
2285	struct device **devs = NULL;
2286	int i, rc = 0, type;
2287
2288	*err = 0;
2289	nvdimm_bus_lock(&nd_region->dev);
2290	rc = init_active_labels(nd_region);
2291	if (rc) {
2292		nvdimm_bus_unlock(&nd_region->dev);
2293		return rc;
2294	}
2295
2296	type = nd_region_to_nstype(nd_region);
2297	switch (type) {
2298	case ND_DEVICE_NAMESPACE_IO:
2299		devs = create_namespace_io(nd_region);
2300		break;
2301	case ND_DEVICE_NAMESPACE_PMEM:
2302	case ND_DEVICE_NAMESPACE_BLK:
2303		devs = create_namespaces(nd_region);
2304		break;
2305	default:
2306		break;
2307	}
2308	nvdimm_bus_unlock(&nd_region->dev);
2309
2310	if (!devs)
2311		return -ENODEV;
2312
2313	for (i = 0; devs[i]; i++) {
2314		struct device *dev = devs[i];
2315		int id;
2316
2317		if (type == ND_DEVICE_NAMESPACE_BLK) {
2318			struct nd_namespace_blk *nsblk;
2319
2320			nsblk = to_nd_namespace_blk(dev);
2321			id = ida_simple_get(&nd_region->ns_ida, 0, 0,
2322					GFP_KERNEL);
2323			nsblk->id = id;
2324		} else if (type == ND_DEVICE_NAMESPACE_PMEM) {
2325			struct nd_namespace_pmem *nspm;
2326
2327			nspm = to_nd_namespace_pmem(dev);
2328			id = ida_simple_get(&nd_region->ns_ida, 0, 0,
2329					GFP_KERNEL);
2330			nspm->id = id;
2331		} else
2332			id = i;
2333
2334		if (id < 0)
2335			break;
2336		dev_set_name(dev, "namespace%d.%d", nd_region->id, id);
2337		dev->groups = nd_namespace_attribute_groups;
 
2338		nd_device_register(dev);
2339	}
2340	if (i)
2341		nd_region->ns_seed = devs[0];
2342
2343	if (devs[i]) {
2344		int j;
2345
2346		for (j = i; devs[j]; j++) {
2347			struct device *dev = devs[j];
2348
2349			device_initialize(dev);
2350			put_device(dev);
2351		}
2352		*err = j - i;
2353		/*
2354		 * All of the namespaces we tried to register failed, so
2355		 * fail region activation.
2356		 */
2357		if (*err == 0)
2358			rc = -ENODEV;
2359	}
2360	kfree(devs);
2361
2362	if (rc == -ENODEV)
2363		return rc;
2364
2365	return i;
2366}