1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved. 4 */ 5#ifndef __ND_H__ 6#define __ND_H__ 7#include <linux/libnvdimm.h> 8#include <linux/badblocks.h> 9#include <linux/blkdev.h> 10#include <linux/device.h> 11#include <linux/mutex.h> 12#include <linux/ndctl.h> 13#include <linux/types.h> 14#include <linux/nd.h> 15#include "label.h" 16 17enum { 18 /* 19 * Limits the maximum number of block apertures a dimm can 20 * support and is an input to the geometry/on-disk-format of a 21 * BTT instance 22 */ 23 ND_MAX_LANES = 256, 24 INT_LBASIZE_ALIGNMENT = 64, 25 NVDIMM_IO_ATOMIC = 1, 26}; 27 28struct nvdimm_drvdata { 29 struct device *dev; 30 int nslabel_size; 31 struct nd_cmd_get_config_size nsarea; 32 void *data; 33 bool cxl; 34 int ns_current, ns_next; 35 struct resource dpa; 36 struct kref kref; 37}; 38 39static inline const u8 *nsl_ref_name(struct nvdimm_drvdata *ndd, 40 struct nd_namespace_label *nd_label) 41{ 42 if (ndd->cxl) 43 return nd_label->cxl.name; 44 return nd_label->efi.name; 45} 46 47static inline u8 *nsl_get_name(struct nvdimm_drvdata *ndd, 48 struct nd_namespace_label *nd_label, u8 *name) 49{ 50 if (ndd->cxl) 51 return memcpy(name, nd_label->cxl.name, NSLABEL_NAME_LEN); 52 return memcpy(name, nd_label->efi.name, NSLABEL_NAME_LEN); 53} 54 55static inline u8 *nsl_set_name(struct nvdimm_drvdata *ndd, 56 struct nd_namespace_label *nd_label, u8 *name) 57{ 58 if (!name) 59 return NULL; 60 if (ndd->cxl) 61 return memcpy(nd_label->cxl.name, name, NSLABEL_NAME_LEN); 62 return memcpy(nd_label->efi.name, name, NSLABEL_NAME_LEN); 63} 64 65static inline u32 nsl_get_slot(struct nvdimm_drvdata *ndd, 66 struct nd_namespace_label *nd_label) 67{ 68 if (ndd->cxl) 69 return __le32_to_cpu(nd_label->cxl.slot); 70 return __le32_to_cpu(nd_label->efi.slot); 71} 72 73static inline void nsl_set_slot(struct nvdimm_drvdata *ndd, 74 struct nd_namespace_label *nd_label, u32 slot) 75{ 76 if (ndd->cxl) 77 nd_label->cxl.slot = __cpu_to_le32(slot); 78 else 79 nd_label->efi.slot = __cpu_to_le32(slot); 80} 81 82static inline u64 nsl_get_checksum(struct nvdimm_drvdata *ndd, 83 struct nd_namespace_label *nd_label) 84{ 85 if (ndd->cxl) 86 return __le64_to_cpu(nd_label->cxl.checksum); 87 return __le64_to_cpu(nd_label->efi.checksum); 88} 89 90static inline void nsl_set_checksum(struct nvdimm_drvdata *ndd, 91 struct nd_namespace_label *nd_label, 92 u64 checksum) 93{ 94 if (ndd->cxl) 95 nd_label->cxl.checksum = __cpu_to_le64(checksum); 96 else 97 nd_label->efi.checksum = __cpu_to_le64(checksum); 98} 99 100static inline u32 nsl_get_flags(struct nvdimm_drvdata *ndd, 101 struct nd_namespace_label *nd_label) 102{ 103 if (ndd->cxl) 104 return __le32_to_cpu(nd_label->cxl.flags); 105 return __le32_to_cpu(nd_label->efi.flags); 106} 107 108static inline void nsl_set_flags(struct nvdimm_drvdata *ndd, 109 struct nd_namespace_label *nd_label, u32 flags) 110{ 111 if (ndd->cxl) 112 nd_label->cxl.flags = __cpu_to_le32(flags); 113 else 114 nd_label->efi.flags = __cpu_to_le32(flags); 115} 116 117static inline u64 nsl_get_dpa(struct nvdimm_drvdata *ndd, 118 struct nd_namespace_label *nd_label) 119{ 120 if (ndd->cxl) 121 return __le64_to_cpu(nd_label->cxl.dpa); 122 return __le64_to_cpu(nd_label->efi.dpa); 123} 124 125static inline void nsl_set_dpa(struct nvdimm_drvdata *ndd, 126 struct nd_namespace_label *nd_label, u64 dpa) 127{ 128 if (ndd->cxl) 129 nd_label->cxl.dpa = __cpu_to_le64(dpa); 130 else 131 nd_label->efi.dpa = __cpu_to_le64(dpa); 132} 133 134static inline u64 nsl_get_rawsize(struct nvdimm_drvdata *ndd, 135 struct nd_namespace_label *nd_label) 136{ 137 if (ndd->cxl) 138 return __le64_to_cpu(nd_label->cxl.rawsize); 139 return __le64_to_cpu(nd_label->efi.rawsize); 140} 141 142static inline void nsl_set_rawsize(struct nvdimm_drvdata *ndd, 143 struct nd_namespace_label *nd_label, 144 u64 rawsize) 145{ 146 if (ndd->cxl) 147 nd_label->cxl.rawsize = __cpu_to_le64(rawsize); 148 else 149 nd_label->efi.rawsize = __cpu_to_le64(rawsize); 150} 151 152static inline u64 nsl_get_isetcookie(struct nvdimm_drvdata *ndd, 153 struct nd_namespace_label *nd_label) 154{ 155 /* WARN future refactor attempts that break this assumption */ 156 if (dev_WARN_ONCE(ndd->dev, ndd->cxl, 157 "CXL labels do not use the isetcookie concept\n")) 158 return 0; 159 return __le64_to_cpu(nd_label->efi.isetcookie); 160} 161 162static inline void nsl_set_isetcookie(struct nvdimm_drvdata *ndd, 163 struct nd_namespace_label *nd_label, 164 u64 isetcookie) 165{ 166 if (!ndd->cxl) 167 nd_label->efi.isetcookie = __cpu_to_le64(isetcookie); 168} 169 170static inline bool nsl_validate_isetcookie(struct nvdimm_drvdata *ndd, 171 struct nd_namespace_label *nd_label, 172 u64 cookie) 173{ 174 /* 175 * Let the EFI and CXL validation comingle, where fields that 176 * don't matter to CXL always validate. 177 */ 178 if (ndd->cxl) 179 return true; 180 return cookie == __le64_to_cpu(nd_label->efi.isetcookie); 181} 182 183static inline u16 nsl_get_position(struct nvdimm_drvdata *ndd, 184 struct nd_namespace_label *nd_label) 185{ 186 if (ndd->cxl) 187 return __le16_to_cpu(nd_label->cxl.position); 188 return __le16_to_cpu(nd_label->efi.position); 189} 190 191static inline void nsl_set_position(struct nvdimm_drvdata *ndd, 192 struct nd_namespace_label *nd_label, 193 u16 position) 194{ 195 if (ndd->cxl) 196 nd_label->cxl.position = __cpu_to_le16(position); 197 else 198 nd_label->efi.position = __cpu_to_le16(position); 199} 200 201static inline u16 nsl_get_nlabel(struct nvdimm_drvdata *ndd, 202 struct nd_namespace_label *nd_label) 203{ 204 if (ndd->cxl) 205 return 0; 206 return __le16_to_cpu(nd_label->efi.nlabel); 207} 208 209static inline void nsl_set_nlabel(struct nvdimm_drvdata *ndd, 210 struct nd_namespace_label *nd_label, 211 u16 nlabel) 212{ 213 if (!ndd->cxl) 214 nd_label->efi.nlabel = __cpu_to_le16(nlabel); 215} 216 217static inline u16 nsl_get_nrange(struct nvdimm_drvdata *ndd, 218 struct nd_namespace_label *nd_label) 219{ 220 if (ndd->cxl) 221 return __le16_to_cpu(nd_label->cxl.nrange); 222 return 1; 223} 224 225static inline void nsl_set_nrange(struct nvdimm_drvdata *ndd, 226 struct nd_namespace_label *nd_label, 227 u16 nrange) 228{ 229 if (ndd->cxl) 230 nd_label->cxl.nrange = __cpu_to_le16(nrange); 231} 232 233static inline u64 nsl_get_lbasize(struct nvdimm_drvdata *ndd, 234 struct nd_namespace_label *nd_label) 235{ 236 /* 237 * Yes, for some reason the EFI labels convey a massive 64-bit 238 * lbasize, that got fixed for CXL. 239 */ 240 if (ndd->cxl) 241 return __le16_to_cpu(nd_label->cxl.lbasize); 242 return __le64_to_cpu(nd_label->efi.lbasize); 243} 244 245static inline void nsl_set_lbasize(struct nvdimm_drvdata *ndd, 246 struct nd_namespace_label *nd_label, 247 u64 lbasize) 248{ 249 if (ndd->cxl) 250 nd_label->cxl.lbasize = __cpu_to_le16(lbasize); 251 else 252 nd_label->efi.lbasize = __cpu_to_le64(lbasize); 253} 254 255static inline const uuid_t *nsl_get_uuid(struct nvdimm_drvdata *ndd, 256 struct nd_namespace_label *nd_label, 257 uuid_t *uuid) 258{ 259 if (ndd->cxl) 260 import_uuid(uuid, nd_label->cxl.uuid); 261 else 262 import_uuid(uuid, nd_label->efi.uuid); 263 return uuid; 264} 265 266static inline const uuid_t *nsl_set_uuid(struct nvdimm_drvdata *ndd, 267 struct nd_namespace_label *nd_label, 268 const uuid_t *uuid) 269{ 270 if (ndd->cxl) 271 export_uuid(nd_label->cxl.uuid, uuid); 272 else 273 export_uuid(nd_label->efi.uuid, uuid); 274 return uuid; 275} 276 277static inline bool nsl_uuid_equal(struct nvdimm_drvdata *ndd, 278 struct nd_namespace_label *nd_label, 279 const uuid_t *uuid) 280{ 281 uuid_t tmp; 282 283 if (ndd->cxl) 284 import_uuid(&tmp, nd_label->cxl.uuid); 285 else 286 import_uuid(&tmp, nd_label->efi.uuid); 287 return uuid_equal(&tmp, uuid); 288} 289 290static inline const u8 *nsl_uuid_raw(struct nvdimm_drvdata *ndd, 291 struct nd_namespace_label *nd_label) 292{ 293 if (ndd->cxl) 294 return nd_label->cxl.uuid; 295 return nd_label->efi.uuid; 296} 297 298bool nsl_validate_type_guid(struct nvdimm_drvdata *ndd, 299 struct nd_namespace_label *nd_label, guid_t *guid); 300enum nvdimm_claim_class nsl_get_claim_class(struct nvdimm_drvdata *ndd, 301 struct nd_namespace_label *nd_label); 302 303struct nd_region_data { 304 int ns_count; 305 int ns_active; 306 unsigned int hints_shift; 307 void __iomem *flush_wpq[]; 308}; 309 310static inline void __iomem *ndrd_get_flush_wpq(struct nd_region_data *ndrd, 311 int dimm, int hint) 312{ 313 unsigned int num = 1 << ndrd->hints_shift; 314 unsigned int mask = num - 1; 315 316 return ndrd->flush_wpq[dimm * num + (hint & mask)]; 317} 318 319static inline void ndrd_set_flush_wpq(struct nd_region_data *ndrd, int dimm, 320 int hint, void __iomem *flush) 321{ 322 unsigned int num = 1 << ndrd->hints_shift; 323 unsigned int mask = num - 1; 324 325 ndrd->flush_wpq[dimm * num + (hint & mask)] = flush; 326} 327 328static inline struct nd_namespace_index *to_namespace_index( 329 struct nvdimm_drvdata *ndd, int i) 330{ 331 if (i < 0) 332 return NULL; 333 334 return ndd->data + sizeof_namespace_index(ndd) * i; 335} 336 337static inline struct nd_namespace_index *to_current_namespace_index( 338 struct nvdimm_drvdata *ndd) 339{ 340 return to_namespace_index(ndd, ndd->ns_current); 341} 342 343static inline struct nd_namespace_index *to_next_namespace_index( 344 struct nvdimm_drvdata *ndd) 345{ 346 return to_namespace_index(ndd, ndd->ns_next); 347} 348 349unsigned sizeof_namespace_label(struct nvdimm_drvdata *ndd); 350 351#define efi_namespace_label_has(ndd, field) \ 352 (!ndd->cxl && offsetof(struct nvdimm_efi_label, field) \ 353 < sizeof_namespace_label(ndd)) 354 355#define nd_dbg_dpa(r, d, res, fmt, arg...) \ 356 dev_dbg((r) ? &(r)->dev : (d)->dev, "%s: %.13s: %#llx @ %#llx " fmt, \ 357 (r) ? dev_name((d)->dev) : "", res ? res->name : "null", \ 358 (unsigned long long) (res ? resource_size(res) : 0), \ 359 (unsigned long long) (res ? res->start : 0), ##arg) 360 361#define for_each_dpa_resource(ndd, res) \ 362 for (res = (ndd)->dpa.child; res; res = res->sibling) 363 364#define for_each_dpa_resource_safe(ndd, res, next) \ 365 for (res = (ndd)->dpa.child, next = res ? res->sibling : NULL; \ 366 res; res = next, next = next ? next->sibling : NULL) 367 368struct nd_percpu_lane { 369 int count; 370 spinlock_t lock; 371}; 372 373enum nd_label_flags { 374 ND_LABEL_REAP, 375}; 376struct nd_label_ent { 377 struct list_head list; 378 unsigned long flags; 379 struct nd_namespace_label *label; 380}; 381 382enum nd_mapping_lock_class { 383 ND_MAPPING_CLASS0, 384 ND_MAPPING_UUID_SCAN, 385}; 386 387struct nd_mapping { 388 struct nvdimm *nvdimm; 389 u64 start; 390 u64 size; 391 int position; 392 struct list_head labels; 393 struct mutex lock; 394 /* 395 * @ndd is for private use at region enable / disable time for 396 * get_ndd() + put_ndd(), all other nd_mapping to ndd 397 * conversions use to_ndd() which respects enabled state of the 398 * nvdimm. 399 */ 400 struct nvdimm_drvdata *ndd; 401}; 402 403struct nd_region { 404 struct device dev; 405 struct ida ns_ida; 406 struct ida btt_ida; 407 struct ida pfn_ida; 408 struct ida dax_ida; 409 unsigned long flags; 410 struct device *ns_seed; 411 struct device *btt_seed; 412 struct device *pfn_seed; 413 struct device *dax_seed; 414 unsigned long align; 415 u16 ndr_mappings; 416 u64 ndr_size; 417 u64 ndr_start; 418 int id, num_lanes, ro, numa_node, target_node; 419 void *provider_data; 420 struct kernfs_node *bb_state; 421 struct badblocks bb; 422 struct nd_interleave_set *nd_set; 423 struct nd_percpu_lane __percpu *lane; 424 int (*flush)(struct nd_region *nd_region, struct bio *bio); 425 struct nd_mapping mapping[] __counted_by(ndr_mappings); 426}; 427 428static inline bool nsl_validate_nlabel(struct nd_region *nd_region, 429 struct nvdimm_drvdata *ndd, 430 struct nd_namespace_label *nd_label) 431{ 432 if (ndd->cxl) 433 return true; 434 return nsl_get_nlabel(ndd, nd_label) == nd_region->ndr_mappings; 435} 436 437/* 438 * Lookup next in the repeating sequence of 01, 10, and 11. 439 */ 440static inline unsigned nd_inc_seq(unsigned seq) 441{ 442 static const unsigned next[] = { 0, 2, 3, 1 }; 443 444 return next[seq & 3]; 445} 446 447struct btt; 448struct nd_btt { 449 struct device dev; 450 struct nd_namespace_common *ndns; 451 struct btt *btt; 452 unsigned long lbasize; 453 u64 size; 454 uuid_t *uuid; 455 int id; 456 int initial_offset; 457 u16 version_major; 458 u16 version_minor; 459}; 460 461enum nd_pfn_mode { 462 PFN_MODE_NONE, 463 PFN_MODE_RAM, 464 PFN_MODE_PMEM, 465}; 466 467struct nd_pfn { 468 int id; 469 uuid_t *uuid; 470 struct device dev; 471 unsigned long align; 472 unsigned long npfns; 473 enum nd_pfn_mode mode; 474 struct nd_pfn_sb *pfn_sb; 475 struct nd_namespace_common *ndns; 476}; 477 478struct nd_dax { 479 struct nd_pfn nd_pfn; 480}; 481 482static inline u32 nd_info_block_reserve(void) 483{ 484 return ALIGN(SZ_8K, PAGE_SIZE); 485} 486 487enum nd_async_mode { 488 ND_SYNC, 489 ND_ASYNC, 490}; 491 492int nd_integrity_init(struct gendisk *disk, unsigned long meta_size); 493void wait_nvdimm_bus_probe_idle(struct device *dev); 494void nd_device_register(struct device *dev); 495void nd_device_unregister(struct device *dev, enum nd_async_mode mode); 496void nd_device_notify(struct device *dev, enum nvdimm_event event); 497int nd_uuid_store(struct device *dev, uuid_t **uuid_out, const char *buf, 498 size_t len); 499ssize_t nd_size_select_show(unsigned long current_size, 500 const unsigned long *supported, char *buf); 501ssize_t nd_size_select_store(struct device *dev, const char *buf, 502 unsigned long *current_size, const unsigned long *supported); 503int __init nvdimm_init(void); 504int __init nd_region_init(void); 505int __init nd_label_init(void); 506void nvdimm_exit(void); 507void nd_region_exit(void); 508struct nvdimm; 509extern const struct attribute_group nd_device_attribute_group; 510extern const struct attribute_group nd_numa_attribute_group; 511extern const struct attribute_group *nvdimm_bus_attribute_groups[]; 512struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping); 513int nvdimm_check_config_data(struct device *dev); 514int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd); 515int nvdimm_init_config_data(struct nvdimm_drvdata *ndd); 516int nvdimm_get_config_data(struct nvdimm_drvdata *ndd, void *buf, 517 size_t offset, size_t len); 518int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset, 519 void *buf, size_t len); 520long nvdimm_clear_poison(struct device *dev, phys_addr_t phys, 521 unsigned int len); 522void nvdimm_set_labeling(struct device *dev); 523void nvdimm_set_locked(struct device *dev); 524void nvdimm_clear_locked(struct device *dev); 525int nvdimm_security_setup_events(struct device *dev); 526#if IS_ENABLED(CONFIG_NVDIMM_KEYS) 527int nvdimm_security_unlock(struct device *dev); 528#else 529static inline int nvdimm_security_unlock(struct device *dev) 530{ 531 return 0; 532} 533#endif 534struct nd_btt *to_nd_btt(struct device *dev); 535 536struct nd_gen_sb { 537 char reserved[SZ_4K - 8]; 538 __le64 checksum; 539}; 540 541u64 nd_sb_checksum(struct nd_gen_sb *sb); 542#if IS_ENABLED(CONFIG_BTT) 543int nd_btt_probe(struct device *dev, struct nd_namespace_common *ndns); 544bool is_nd_btt(struct device *dev); 545struct device *nd_btt_create(struct nd_region *nd_region); 546#else 547static inline int nd_btt_probe(struct device *dev, 548 struct nd_namespace_common *ndns) 549{ 550 return -ENODEV; 551} 552 553static inline bool is_nd_btt(struct device *dev) 554{ 555 return false; 556} 557 558static inline struct device *nd_btt_create(struct nd_region *nd_region) 559{ 560 return NULL; 561} 562#endif 563 564struct nd_pfn *to_nd_pfn(struct device *dev); 565#if IS_ENABLED(CONFIG_NVDIMM_PFN) 566 567#define MAX_NVDIMM_ALIGN 4 568 569int nd_pfn_probe(struct device *dev, struct nd_namespace_common *ndns); 570bool is_nd_pfn(struct device *dev); 571struct device *nd_pfn_create(struct nd_region *nd_region); 572struct device *nd_pfn_devinit(struct nd_pfn *nd_pfn, 573 struct nd_namespace_common *ndns); 574int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig); 575extern const struct attribute_group *nd_pfn_attribute_groups[]; 576#else 577static inline int nd_pfn_probe(struct device *dev, 578 struct nd_namespace_common *ndns) 579{ 580 return -ENODEV; 581} 582 583static inline bool is_nd_pfn(struct device *dev) 584{ 585 return false; 586} 587 588static inline struct device *nd_pfn_create(struct nd_region *nd_region) 589{ 590 return NULL; 591} 592 593static inline int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig) 594{ 595 return -ENODEV; 596} 597#endif 598 599struct nd_dax *to_nd_dax(struct device *dev); 600#if IS_ENABLED(CONFIG_NVDIMM_DAX) 601int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns); 602bool is_nd_dax(const struct device *dev); 603struct device *nd_dax_create(struct nd_region *nd_region); 604#else 605static inline int nd_dax_probe(struct device *dev, 606 struct nd_namespace_common *ndns) 607{ 608 return -ENODEV; 609} 610 611static inline bool is_nd_dax(const struct device *dev) 612{ 613 return false; 614} 615 616static inline struct device *nd_dax_create(struct nd_region *nd_region) 617{ 618 return NULL; 619} 620#endif 621 622int nd_region_to_nstype(struct nd_region *nd_region); 623int nd_region_register_namespaces(struct nd_region *nd_region, int *err); 624u64 nd_region_interleave_set_cookie(struct nd_region *nd_region, 625 struct nd_namespace_index *nsindex); 626u64 nd_region_interleave_set_altcookie(struct nd_region *nd_region); 627void nvdimm_bus_lock(struct device *dev); 628void nvdimm_bus_unlock(struct device *dev); 629bool is_nvdimm_bus_locked(struct device *dev); 630void nvdimm_check_and_set_ro(struct gendisk *disk); 631void nvdimm_drvdata_release(struct kref *kref); 632void put_ndd(struct nvdimm_drvdata *ndd); 633int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd); 634void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res); 635struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd, 636 struct nd_label_id *label_id, resource_size_t start, 637 resource_size_t n); 638resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns); 639bool nvdimm_namespace_locked(struct nd_namespace_common *ndns); 640struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev); 641int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns); 642int nvdimm_namespace_detach_btt(struct nd_btt *nd_btt); 643const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns, 644 char *name); 645unsigned int pmem_sector_size(struct nd_namespace_common *ndns); 646struct range; 647void nvdimm_badblocks_populate(struct nd_region *nd_region, 648 struct badblocks *bb, const struct range *range); 649int devm_namespace_enable(struct device *dev, struct nd_namespace_common *ndns, 650 resource_size_t size); 651void devm_namespace_disable(struct device *dev, 652 struct nd_namespace_common *ndns); 653#if IS_ENABLED(CONFIG_ND_CLAIM) 654/* max struct page size independent of kernel config */ 655#define MAX_STRUCT_PAGE_SIZE 64 656int nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap); 657#else 658static inline int nvdimm_setup_pfn(struct nd_pfn *nd_pfn, 659 struct dev_pagemap *pgmap) 660{ 661 return -ENXIO; 662} 663#endif 664int nd_region_activate(struct nd_region *nd_region); 665static inline bool is_bad_pmem(struct badblocks *bb, sector_t sector, 666 unsigned int len) 667{ 668 if (bb->count) { 669 sector_t first_bad; 670 int num_bad; 671 672 return !!badblocks_check(bb, sector, len / 512, &first_bad, 673 &num_bad); 674 } 675 676 return false; 677} 678const uuid_t *nd_dev_to_uuid(struct device *dev); 679bool pmem_should_map_pages(struct device *dev); 680#endif /* __ND_H__ */ 681